diff --git a/dist/tangram.debug.js b/dist/tangram.debug.js
index f21f07d0f..f71c44fe2 100644
--- a/dist/tangram.debug.js
+++ b/dist/tangram.debug.js
@@ -1,6 +1,418 @@
-(function(){var target = (typeof module !== "undefined" && module.exports) || (typeof window !== "undefined");if (target) {var __worker_src__ = arguments.callee.toString();var __worker_src_origin__ = document.currentScript !== undefined ? document.currentScript.src : '';};(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Tangram = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+(function(){var target = (typeof module !== "undefined" && module.exports) || (typeof window !== "undefined");if (target) {var __worker_src__ = arguments.callee.toString();var __worker_src_origin__ = document.currentScript !== undefined ? document.currentScript.src : '';var __worker_src_map__ = 'tangram.debug.js.map';};(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Tangram = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+"use strict";
+
+// rawAsap provides everything we need except exception management.
+var rawAsap = _dereq_("./raw");
+// RawTasks are recycled to reduce GC churn.
+var freeTasks = [];
+// We queue errors to ensure they are thrown in right order (FIFO).
+// Array-as-queue is good enough here, since we are just dealing with exceptions.
+var pendingErrors = [];
+var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);
+
+function throwFirstError() {
+    if (pendingErrors.length) {
+        throw pendingErrors.shift();
+    }
+}
+
+/**
+ * Calls a task as soon as possible after returning, in its own event, with priority
+ * over other events like animation, reflow, and repaint. An error thrown from an
+ * event will not interrupt, nor even substantially slow down the processing of
+ * other events, but will be rather postponed to a lower priority event.
+ * @param {{call}} task A callable object, typically a function that takes no
+ * arguments.
+ */
+module.exports = asap;
+function asap(task) {
+    var rawTask;
+    if (freeTasks.length) {
+        rawTask = freeTasks.pop();
+    } else {
+        rawTask = new RawTask();
+    }
+    rawTask.task = task;
+    rawAsap(rawTask);
+}
+
+// We wrap tasks with recyclable task objects.  A task object implements
+// `call`, just like a function.
+function RawTask() {
+    this.task = null;
+}
+
+// The sole purpose of wrapping the task is to catch the exception and recycle
+// the task object after its single use.
+RawTask.prototype.call = function () {
+    try {
+        this.task.call();
+    } catch (error) {
+        if (asap.onerror) {
+            // This hook exists purely for testing purposes.
+            // Its name will be periodically randomized to break any code that
+            // depends on its existence.
+            asap.onerror(error);
+        } else {
+            // In a web browser, exceptions are not fatal. However, to avoid
+            // slowing down the queue of pending tasks, we rethrow the error in a
+            // lower priority turn.
+            pendingErrors.push(error);
+            requestErrorThrow();
+        }
+    } finally {
+        this.task = null;
+        freeTasks[freeTasks.length] = this;
+    }
+};
+
+},{"./raw":2}],2:[function(_dereq_,module,exports){
+(function (global){
+"use strict";
+
+// Use the fastest means possible to execute a task in its own turn, with
+// priority over other events including IO, animation, reflow, and redraw
+// events in browsers.
+//
+// An exception thrown by a task will permanently interrupt the processing of
+// subsequent tasks. The higher level `asap` function ensures that if an
+// exception is thrown by a task, that the task queue will continue flushing as
+// soon as possible, but if you use `rawAsap` directly, you are responsible to
+// either ensure that no exceptions are thrown from your task, or to manually
+// call `rawAsap.requestFlush` if an exception is thrown.
+module.exports = rawAsap;
+function rawAsap(task) {
+    if (!queue.length) {
+        requestFlush();
+        flushing = true;
+    }
+    // Equivalent to push, but avoids a function call.
+    queue[queue.length] = task;
+}
+
+var queue = [];
+// Once a flush has been requested, no further calls to `requestFlush` are
+// necessary until the next `flush` completes.
+var flushing = false;
+// `requestFlush` is an implementation-specific method that attempts to kick
+// off a `flush` event as quickly as possible. `flush` will attempt to exhaust
+// the event queue before yielding to the browser's own event loop.
+var requestFlush;
+// The position of the next task to execute in the task queue. This is
+// preserved between calls to `flush` so that it can be resumed if
+// a task throws an exception.
+var index = 0;
+// If a task schedules additional tasks recursively, the task queue can grow
+// unbounded. To prevent memory exhaustion, the task queue will periodically
+// truncate already-completed tasks.
+var capacity = 1024;
+
+// The flush function processes all tasks that have been scheduled with
+// `rawAsap` unless and until one of those tasks throws an exception.
+// If a task throws an exception, `flush` ensures that its state will remain
+// consistent and will resume where it left off when called again.
+// However, `flush` does not make any arrangements to be called again if an
+// exception is thrown.
+function flush() {
+    while (index < queue.length) {
+        var currentIndex = index;
+        // Advance the index before calling the task. This ensures that we will
+        // begin flushing on the next task the task throws an error.
+        index = index + 1;
+        queue[currentIndex].call();
+        // Prevent leaking memory for long chains of recursive calls to `asap`.
+        // If we call `asap` within tasks scheduled by `asap`, the queue will
+        // grow, but to avoid an O(n) walk for every task we execute, we don't
+        // shift tasks off the queue after they have been executed.
+        // Instead, we periodically shift 1024 tasks off the queue.
+        if (index > capacity) {
+            // Manually shift all values starting at the index back to the
+            // beginning of the queue.
+            for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {
+                queue[scan] = queue[scan + index];
+            }
+            queue.length -= index;
+            index = 0;
+        }
+    }
+    queue.length = 0;
+    index = 0;
+    flushing = false;
+}
+
+// `requestFlush` is implemented using a strategy based on data collected from
+// every available SauceLabs Selenium web driver worker at time of writing.
+// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593
 
-},{}],2:[function(_dereq_,module,exports){
+// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
+// have WebKitMutationObserver but not un-prefixed MutationObserver.
+// Must use `global` or `self` instead of `window` to work in both frames and web
+// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.
+
+/* globals self */
+var scope = typeof global !== "undefined" ? global : self;
+var BrowserMutationObserver = scope.MutationObserver || scope.WebKitMutationObserver;
+
+// MutationObservers are desirable because they have high priority and work
+// reliably everywhere they are implemented.
+// They are implemented in all modern browsers.
+//
+// - Android 4-4.3
+// - Chrome 26-34
+// - Firefox 14-29
+// - Internet Explorer 11
+// - iPad Safari 6-7.1
+// - iPhone Safari 7-7.1
+// - Safari 6-7
+if (typeof BrowserMutationObserver === "function") {
+    requestFlush = makeRequestCallFromMutationObserver(flush);
+
+// MessageChannels are desirable because they give direct access to the HTML
+// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
+// 11-12, and in web workers in many engines.
+// Although message channels yield to any queued rendering and IO tasks, they
+// would be better than imposing the 4ms delay of timers.
+// However, they do not work reliably in Internet Explorer or Safari.
+
+// Internet Explorer 10 is the only browser that has setImmediate but does
+// not have MutationObservers.
+// Although setImmediate yields to the browser's renderer, it would be
+// preferrable to falling back to setTimeout since it does not have
+// the minimum 4ms penalty.
+// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
+// Desktop to a lesser extent) that renders both setImmediate and
+// MessageChannel useless for the purposes of ASAP.
+// https://github.com/kriskowal/q/issues/396
+
+// Timers are implemented universally.
+// We fall back to timers in workers in most engines, and in foreground
+// contexts in the following browsers.
+// However, note that even this simple case requires nuances to operate in a
+// broad spectrum of browsers.
+//
+// - Firefox 3-13
+// - Internet Explorer 6-9
+// - iPad Safari 4.3
+// - Lynx 2.8.7
+} else {
+    requestFlush = makeRequestCallFromTimer(flush);
+}
+
+// `requestFlush` requests that the high priority event queue be flushed as
+// soon as possible.
+// This is useful to prevent an error thrown in a task from stalling the event
+// queue if the exception handled by Node.js’s
+// `process.on("uncaughtException")` or by a domain.
+rawAsap.requestFlush = requestFlush;
+
+// To request a high priority event, we induce a mutation observer by toggling
+// the text of a text node between "1" and "-1".
+function makeRequestCallFromMutationObserver(callback) {
+    var toggle = 1;
+    var observer = new BrowserMutationObserver(callback);
+    var node = document.createTextNode("");
+    observer.observe(node, {characterData: true});
+    return function requestCall() {
+        toggle = -toggle;
+        node.data = toggle;
+    };
+}
+
+// The message channel technique was discovered by Malte Ubl and was the
+// original foundation for this library.
+// http://www.nonblocking.io/2011/06/windownexttick.html
+
+// Safari 6.0.5 (at least) intermittently fails to create message ports on a
+// page's first load. Thankfully, this version of Safari supports
+// MutationObservers, so we don't need to fall back in that case.
+
+// function makeRequestCallFromMessageChannel(callback) {
+//     var channel = new MessageChannel();
+//     channel.port1.onmessage = callback;
+//     return function requestCall() {
+//         channel.port2.postMessage(0);
+//     };
+// }
+
+// For reasons explained above, we are also unable to use `setImmediate`
+// under any circumstances.
+// Even if we were, there is another bug in Internet Explorer 10.
+// It is not sufficient to assign `setImmediate` to `requestFlush` because
+// `setImmediate` must be called *by name* and therefore must be wrapped in a
+// closure.
+// Never forget.
+
+// function makeRequestCallFromSetImmediate(callback) {
+//     return function requestCall() {
+//         setImmediate(callback);
+//     };
+// }
+
+// Safari 6.0 has a problem where timers will get lost while the user is
+// scrolling. This problem does not impact ASAP because Safari 6.0 supports
+// mutation observers, so that implementation is used instead.
+// However, if we ever elect to use timers in Safari, the prevalent work-around
+// is to add a scroll event listener that calls for a flush.
+
+// `setTimeout` does not call the passed callback if the delay is less than
+// approximately 7 in web workers in Firefox 8 through 18, and sometimes not
+// even then.
+
+function makeRequestCallFromTimer(callback) {
+    return function requestCall() {
+        // We dispatch a timeout with a specified delay of 0 for engines that
+        // can reliably accommodate that request. This will usually be snapped
+        // to a 4 milisecond delay, but once we're flushing, there's no delay
+        // between events.
+        var timeoutHandle = setTimeout(handleTimer, 0);
+        // However, since this timer gets frequently dropped in Firefox
+        // workers, we enlist an interval handle that will try to fire
+        // an event 20 times per second until it succeeds.
+        var intervalHandle = setInterval(handleTimer, 50);
+
+        function handleTimer() {
+            // Whichever timer succeeds will cancel both timers and
+            // execute the callback.
+            clearTimeout(timeoutHandle);
+            clearInterval(intervalHandle);
+            callback();
+        }
+    };
+}
+
+// This is for `asap.js` only.
+// Its name will be periodically randomized to break any code that depends on
+// its existence.
+rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;
+
+// ASAP was originally a nextTick shim included in Q. This was factored out
+// into this ASAP package. It was later adapted to RSVP which made further
+// amendments. These decisions, particularly to marginalize MessageChannel and
+// to capture the MutationObserver implementation in a closure, were integrated
+// back into ASAP proper.
+// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js
+
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+
+},{}],3:[function(_dereq_,module,exports){
+'use strict'
+
+exports.byteLength = byteLength
+exports.toByteArray = toByteArray
+exports.fromByteArray = fromByteArray
+
+var lookup = []
+var revLookup = []
+var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
+
+var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+for (var i = 0, len = code.length; i < len; ++i) {
+  lookup[i] = code[i]
+  revLookup[code.charCodeAt(i)] = i
+}
+
+revLookup['-'.charCodeAt(0)] = 62
+revLookup['_'.charCodeAt(0)] = 63
+
+function placeHoldersCount (b64) {
+  var len = b64.length
+  if (len % 4 > 0) {
+    throw new Error('Invalid string. Length must be a multiple of 4')
+  }
+
+  // the number of equal signs (place holders)
+  // if there are two placeholders, than the two characters before it
+  // represent one byte
+  // if there is only one, then the three characters before it represent 2 bytes
+  // this is just a cheap hack to not do indexOf twice
+  return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
+}
+
+function byteLength (b64) {
+  // base64 is 4/3 + up to two characters of the original data
+  return b64.length * 3 / 4 - placeHoldersCount(b64)
+}
+
+function toByteArray (b64) {
+  var i, j, l, tmp, placeHolders, arr
+  var len = b64.length
+  placeHolders = placeHoldersCount(b64)
+
+  arr = new Arr(len * 3 / 4 - placeHolders)
+
+  // if there are placeholders, only get up to the last complete 4 chars
+  l = placeHolders > 0 ? len - 4 : len
+
+  var L = 0
+
+  for (i = 0, j = 0; i < l; i += 4, j += 3) {
+    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
+    arr[L++] = (tmp >> 16) & 0xFF
+    arr[L++] = (tmp >> 8) & 0xFF
+    arr[L++] = tmp & 0xFF
+  }
+
+  if (placeHolders === 2) {
+    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
+    arr[L++] = tmp & 0xFF
+  } else if (placeHolders === 1) {
+    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
+    arr[L++] = (tmp >> 8) & 0xFF
+    arr[L++] = tmp & 0xFF
+  }
+
+  return arr
+}
+
+function tripletToBase64 (num) {
+  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
+}
+
+function encodeChunk (uint8, start, end) {
+  var tmp
+  var output = []
+  for (var i = start; i < end; i += 3) {
+    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
+    output.push(tripletToBase64(tmp))
+  }
+  return output.join('')
+}
+
+function fromByteArray (uint8) {
+  var tmp
+  var len = uint8.length
+  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
+  var output = ''
+  var parts = []
+  var maxChunkLength = 16383 // must be multiple of 3
+
+  // go through the array every three bytes, we'll deal with trailing stuff later
+  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
+    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
+  }
+
+  // pad the end with zeros, but make sure to not forget the extra bytes
+  if (extraBytes === 1) {
+    tmp = uint8[len - 1]
+    output += lookup[tmp >> 2]
+    output += lookup[(tmp << 4) & 0x3F]
+    output += '=='
+  } else if (extraBytes === 2) {
+    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
+    output += lookup[tmp >> 10]
+    output += lookup[(tmp >> 4) & 0x3F]
+    output += lookup[(tmp << 2) & 0x3F]
+    output += '='
+  }
+
+  parts.push(output)
+
+  return parts.join('')
+}
+
+},{}],4:[function(_dereq_,module,exports){
+
+},{}],5:[function(_dereq_,module,exports){
 (function (global){
 /*!
  * The buffer module from node.js, for the browser.
@@ -1794,758 +2206,1237 @@ function isnan (val) {
 
 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 
-},{"base64-js":3,"ieee754":4,"isarray":5}],3:[function(_dereq_,module,exports){
-'use strict'
-
-exports.byteLength = byteLength
-exports.toByteArray = toByteArray
-exports.fromByteArray = fromByteArray
-
-var lookup = []
-var revLookup = []
-var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
+},{"base64-js":3,"ieee754":93,"isarray":96}],6:[function(_dereq_,module,exports){
+_dereq_('../modules/es6.object.to-string');
+_dereq_('../modules/es6.string.iterator');
+_dereq_('../modules/web.dom.iterable');
+_dereq_('../modules/es6.promise');
+module.exports = _dereq_('../modules/_core').Promise;
+},{"../modules/_core":14,"../modules/es6.object.to-string":66,"../modules/es6.promise":67,"../modules/es6.string.iterator":68,"../modules/web.dom.iterable":69}],7:[function(_dereq_,module,exports){
+module.exports = function(it){
+  if(typeof it != 'function')throw TypeError(it + ' is not a function!');
+  return it;
+};
+},{}],8:[function(_dereq_,module,exports){
+// 22.1.3.31 Array.prototype[@@unscopables]
+var UNSCOPABLES = _dereq_('./_wks')('unscopables')
+  , ArrayProto  = Array.prototype;
+if(ArrayProto[UNSCOPABLES] == undefined)_dereq_('./_hide')(ArrayProto, UNSCOPABLES, {});
+module.exports = function(key){
+  ArrayProto[UNSCOPABLES][key] = true;
+};
+},{"./_hide":25,"./_wks":63}],9:[function(_dereq_,module,exports){
+module.exports = function(it, Constructor, name, forbiddenField){
+  if(!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)){
+    throw TypeError(name + ': incorrect invocation!');
+  } return it;
+};
+},{}],10:[function(_dereq_,module,exports){
+var isObject = _dereq_('./_is-object');
+module.exports = function(it){
+  if(!isObject(it))throw TypeError(it + ' is not an object!');
+  return it;
+};
+},{"./_is-object":31}],11:[function(_dereq_,module,exports){
+// false -> Array#indexOf
+// true  -> Array#includes
+var toIObject = _dereq_('./_to-iobject')
+  , toLength  = _dereq_('./_to-length')
+  , toIndex   = _dereq_('./_to-index');
+module.exports = function(IS_INCLUDES){
+  return function($this, el, fromIndex){
+    var O      = toIObject($this)
+      , length = toLength(O.length)
+      , index  = toIndex(fromIndex, length)
+      , value;
+    // Array#includes uses SameValueZero equality algorithm
+    if(IS_INCLUDES && el != el)while(length > index){
+      value = O[index++];
+      if(value != value)return true;
+    // Array#toIndex ignores holes, Array#includes - not
+    } else for(;length > index; index++)if(IS_INCLUDES || index in O){
+      if(O[index] === el)return IS_INCLUDES || index || 0;
+    } return !IS_INCLUDES && -1;
+  };
+};
+},{"./_to-index":56,"./_to-iobject":58,"./_to-length":59}],12:[function(_dereq_,module,exports){
+// getting tag from 19.1.3.6 Object.prototype.toString()
+var cof = _dereq_('./_cof')
+  , TAG = _dereq_('./_wks')('toStringTag')
+  // ES3 wrong here
+  , ARG = cof(function(){ return arguments; }()) == 'Arguments';
 
-var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
-for (var i = 0, len = code.length; i < len; ++i) {
-  lookup[i] = code[i]
-  revLookup[code.charCodeAt(i)] = i
-}
+// fallback for IE11 Script Access Denied error
+var tryGet = function(it, key){
+  try {
+    return it[key];
+  } catch(e){ /* empty */ }
+};
 
-revLookup['-'.charCodeAt(0)] = 62
-revLookup['_'.charCodeAt(0)] = 63
+module.exports = function(it){
+  var O, T, B;
+  return it === undefined ? 'Undefined' : it === null ? 'Null'
+    // @@toStringTag case
+    : typeof (T = tryGet(O = Object(it), TAG)) == 'string' ? T
+    // builtinTag case
+    : ARG ? cof(O)
+    // ES3 arguments fallback
+    : (B = cof(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : B;
+};
+},{"./_cof":13,"./_wks":63}],13:[function(_dereq_,module,exports){
+var toString = {}.toString;
 
-function placeHoldersCount (b64) {
-  var len = b64.length
-  if (len % 4 > 0) {
-    throw new Error('Invalid string. Length must be a multiple of 4')
+module.exports = function(it){
+  return toString.call(it).slice(8, -1);
+};
+},{}],14:[function(_dereq_,module,exports){
+var core = module.exports = {version: '2.4.0'};
+if(typeof __e == 'number')__e = core; // eslint-disable-line no-undef
+},{}],15:[function(_dereq_,module,exports){
+// optional / simple context binding
+var aFunction = _dereq_('./_a-function');
+module.exports = function(fn, that, length){
+  aFunction(fn);
+  if(that === undefined)return fn;
+  switch(length){
+    case 1: return function(a){
+      return fn.call(that, a);
+    };
+    case 2: return function(a, b){
+      return fn.call(that, a, b);
+    };
+    case 3: return function(a, b, c){
+      return fn.call(that, a, b, c);
+    };
   }
+  return function(/* ...args */){
+    return fn.apply(that, arguments);
+  };
+};
+},{"./_a-function":7}],16:[function(_dereq_,module,exports){
+// 7.2.1 RequireObjectCoercible(argument)
+module.exports = function(it){
+  if(it == undefined)throw TypeError("Can't call method on  " + it);
+  return it;
+};
+},{}],17:[function(_dereq_,module,exports){
+// Thank's IE8 for his funny defineProperty
+module.exports = !_dereq_('./_fails')(function(){
+  return Object.defineProperty({}, 'a', {get: function(){ return 7; }}).a != 7;
+});
+},{"./_fails":21}],18:[function(_dereq_,module,exports){
+var isObject = _dereq_('./_is-object')
+  , document = _dereq_('./_global').document
+  // in old IE typeof document.createElement is 'object'
+  , is = isObject(document) && isObject(document.createElement);
+module.exports = function(it){
+  return is ? document.createElement(it) : {};
+};
+},{"./_global":23,"./_is-object":31}],19:[function(_dereq_,module,exports){
+// IE 8- don't enum bug keys
+module.exports = (
+  'constructor,hasOwnProperty,isPrototypeOf,propertyIsEnumerable,toLocaleString,toString,valueOf'
+).split(',');
+},{}],20:[function(_dereq_,module,exports){
+var global    = _dereq_('./_global')
+  , core      = _dereq_('./_core')
+  , hide      = _dereq_('./_hide')
+  , redefine  = _dereq_('./_redefine')
+  , ctx       = _dereq_('./_ctx')
+  , PROTOTYPE = 'prototype';
 
-  // the number of equal signs (place holders)
-  // if there are two placeholders, than the two characters before it
-  // represent one byte
-  // if there is only one, then the three characters before it represent 2 bytes
-  // this is just a cheap hack to not do indexOf twice
-  return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
-}
-
-function byteLength (b64) {
-  // base64 is 4/3 + up to two characters of the original data
-  return b64.length * 3 / 4 - placeHoldersCount(b64)
-}
-
-function toByteArray (b64) {
-  var i, j, l, tmp, placeHolders, arr
-  var len = b64.length
-  placeHolders = placeHoldersCount(b64)
-
-  arr = new Arr(len * 3 / 4 - placeHolders)
-
-  // if there are placeholders, only get up to the last complete 4 chars
-  l = placeHolders > 0 ? len - 4 : len
-
-  var L = 0
-
-  for (i = 0, j = 0; i < l; i += 4, j += 3) {
-    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
-    arr[L++] = (tmp >> 16) & 0xFF
-    arr[L++] = (tmp >> 8) & 0xFF
-    arr[L++] = tmp & 0xFF
+var $export = function(type, name, source){
+  var IS_FORCED = type & $export.F
+    , IS_GLOBAL = type & $export.G
+    , IS_STATIC = type & $export.S
+    , IS_PROTO  = type & $export.P
+    , IS_BIND   = type & $export.B
+    , target    = IS_GLOBAL ? global : IS_STATIC ? global[name] || (global[name] = {}) : (global[name] || {})[PROTOTYPE]
+    , exports   = IS_GLOBAL ? core : core[name] || (core[name] = {})
+    , expProto  = exports[PROTOTYPE] || (exports[PROTOTYPE] = {})
+    , key, own, out, exp;
+  if(IS_GLOBAL)source = name;
+  for(key in source){
+    // contains in native
+    own = !IS_FORCED && target && target[key] !== undefined;
+    // export native or passed
+    out = (own ? target : source)[key];
+    // bind timers to global for call from export context
+    exp = IS_BIND && own ? ctx(out, global) : IS_PROTO && typeof out == 'function' ? ctx(Function.call, out) : out;
+    // extend global
+    if(target)redefine(target, key, out, type & $export.U);
+    // export
+    if(exports[key] != out)hide(exports, key, exp);
+    if(IS_PROTO && expProto[key] != out)expProto[key] = out;
   }
-
-  if (placeHolders === 2) {
-    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
-    arr[L++] = tmp & 0xFF
-  } else if (placeHolders === 1) {
-    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
-    arr[L++] = (tmp >> 8) & 0xFF
-    arr[L++] = tmp & 0xFF
+};
+global.core = core;
+// type bitmap
+$export.F = 1;   // forced
+$export.G = 2;   // global
+$export.S = 4;   // static
+$export.P = 8;   // proto
+$export.B = 16;  // bind
+$export.W = 32;  // wrap
+$export.U = 64;  // safe
+$export.R = 128; // real proto method for `library` 
+module.exports = $export;
+},{"./_core":14,"./_ctx":15,"./_global":23,"./_hide":25,"./_redefine":48}],21:[function(_dereq_,module,exports){
+module.exports = function(exec){
+  try {
+    return !!exec();
+  } catch(e){
+    return true;
   }
-
-  return arr
-}
-
-function tripletToBase64 (num) {
-  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
-}
-
-function encodeChunk (uint8, start, end) {
-  var tmp
-  var output = []
-  for (var i = start; i < end; i += 3) {
-    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
-    output.push(tripletToBase64(tmp))
+};
+},{}],22:[function(_dereq_,module,exports){
+var ctx         = _dereq_('./_ctx')
+  , call        = _dereq_('./_iter-call')
+  , isArrayIter = _dereq_('./_is-array-iter')
+  , anObject    = _dereq_('./_an-object')
+  , toLength    = _dereq_('./_to-length')
+  , getIterFn   = _dereq_('./core.get-iterator-method')
+  , BREAK       = {}
+  , RETURN      = {};
+var exports = module.exports = function(iterable, entries, fn, that, ITERATOR){
+  var iterFn = ITERATOR ? function(){ return iterable; } : getIterFn(iterable)
+    , f      = ctx(fn, that, entries ? 2 : 1)
+    , index  = 0
+    , length, step, iterator, result;
+  if(typeof iterFn != 'function')throw TypeError(iterable + ' is not iterable!');
+  // fast case for arrays with default iterator
+  if(isArrayIter(iterFn))for(length = toLength(iterable.length); length > index; index++){
+    result = entries ? f(anObject(step = iterable[index])[0], step[1]) : f(iterable[index]);
+    if(result === BREAK || result === RETURN)return result;
+  } else for(iterator = iterFn.call(iterable); !(step = iterator.next()).done; ){
+    result = call(iterator, f, step.value, entries);
+    if(result === BREAK || result === RETURN)return result;
   }
-  return output.join('')
-}
-
-function fromByteArray (uint8) {
-  var tmp
-  var len = uint8.length
-  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
-  var output = ''
-  var parts = []
-  var maxChunkLength = 16383 // must be multiple of 3
+};
+exports.BREAK  = BREAK;
+exports.RETURN = RETURN;
+},{"./_an-object":10,"./_ctx":15,"./_is-array-iter":30,"./_iter-call":32,"./_to-length":59,"./core.get-iterator-method":64}],23:[function(_dereq_,module,exports){
+// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
+var global = module.exports = typeof window != 'undefined' && window.Math == Math
+  ? window : typeof self != 'undefined' && self.Math == Math ? self : Function('return this')();
+if(typeof __g == 'number')__g = global; // eslint-disable-line no-undef
+},{}],24:[function(_dereq_,module,exports){
+var hasOwnProperty = {}.hasOwnProperty;
+module.exports = function(it, key){
+  return hasOwnProperty.call(it, key);
+};
+},{}],25:[function(_dereq_,module,exports){
+var dP         = _dereq_('./_object-dp')
+  , createDesc = _dereq_('./_property-desc');
+module.exports = _dereq_('./_descriptors') ? function(object, key, value){
+  return dP.f(object, key, createDesc(1, value));
+} : function(object, key, value){
+  object[key] = value;
+  return object;
+};
+},{"./_descriptors":17,"./_object-dp":41,"./_property-desc":46}],26:[function(_dereq_,module,exports){
+module.exports = _dereq_('./_global').document && document.documentElement;
+},{"./_global":23}],27:[function(_dereq_,module,exports){
+module.exports = !_dereq_('./_descriptors') && !_dereq_('./_fails')(function(){
+  return Object.defineProperty(_dereq_('./_dom-create')('div'), 'a', {get: function(){ return 7; }}).a != 7;
+});
+},{"./_descriptors":17,"./_dom-create":18,"./_fails":21}],28:[function(_dereq_,module,exports){
+// fast apply, http://jsperf.lnkit.com/fast-apply/5
+module.exports = function(fn, args, that){
+  var un = that === undefined;
+  switch(args.length){
+    case 0: return un ? fn()
+                      : fn.call(that);
+    case 1: return un ? fn(args[0])
+                      : fn.call(that, args[0]);
+    case 2: return un ? fn(args[0], args[1])
+                      : fn.call(that, args[0], args[1]);
+    case 3: return un ? fn(args[0], args[1], args[2])
+                      : fn.call(that, args[0], args[1], args[2]);
+    case 4: return un ? fn(args[0], args[1], args[2], args[3])
+                      : fn.call(that, args[0], args[1], args[2], args[3]);
+  } return              fn.apply(that, args);
+};
+},{}],29:[function(_dereq_,module,exports){
+// fallback for non-array-like ES3 and non-enumerable old V8 strings
+var cof = _dereq_('./_cof');
+module.exports = Object('z').propertyIsEnumerable(0) ? Object : function(it){
+  return cof(it) == 'String' ? it.split('') : Object(it);
+};
+},{"./_cof":13}],30:[function(_dereq_,module,exports){
+// check on default Array iterator
+var Iterators  = _dereq_('./_iterators')
+  , ITERATOR   = _dereq_('./_wks')('iterator')
+  , ArrayProto = Array.prototype;
 
-  // go through the array every three bytes, we'll deal with trailing stuff later
-  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
-    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
+module.exports = function(it){
+  return it !== undefined && (Iterators.Array === it || ArrayProto[ITERATOR] === it);
+};
+},{"./_iterators":37,"./_wks":63}],31:[function(_dereq_,module,exports){
+module.exports = function(it){
+  return typeof it === 'object' ? it !== null : typeof it === 'function';
+};
+},{}],32:[function(_dereq_,module,exports){
+// call something on iterator step with safe closing on error
+var anObject = _dereq_('./_an-object');
+module.exports = function(iterator, fn, value, entries){
+  try {
+    return entries ? fn(anObject(value)[0], value[1]) : fn(value);
+  // 7.4.6 IteratorClose(iterator, completion)
+  } catch(e){
+    var ret = iterator['return'];
+    if(ret !== undefined)anObject(ret.call(iterator));
+    throw e;
   }
+};
+},{"./_an-object":10}],33:[function(_dereq_,module,exports){
+'use strict';
+var create         = _dereq_('./_object-create')
+  , descriptor     = _dereq_('./_property-desc')
+  , setToStringTag = _dereq_('./_set-to-string-tag')
+  , IteratorPrototype = {};
 
-  // pad the end with zeros, but make sure to not forget the extra bytes
-  if (extraBytes === 1) {
-    tmp = uint8[len - 1]
-    output += lookup[tmp >> 2]
-    output += lookup[(tmp << 4) & 0x3F]
-    output += '=='
-  } else if (extraBytes === 2) {
-    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
-    output += lookup[tmp >> 10]
-    output += lookup[(tmp >> 4) & 0x3F]
-    output += lookup[(tmp << 2) & 0x3F]
-    output += '='
-  }
+// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
+_dereq_('./_hide')(IteratorPrototype, _dereq_('./_wks')('iterator'), function(){ return this; });
 
-  parts.push(output)
+module.exports = function(Constructor, NAME, next){
+  Constructor.prototype = create(IteratorPrototype, {next: descriptor(1, next)});
+  setToStringTag(Constructor, NAME + ' Iterator');
+};
+},{"./_hide":25,"./_object-create":40,"./_property-desc":46,"./_set-to-string-tag":50,"./_wks":63}],34:[function(_dereq_,module,exports){
+'use strict';
+var LIBRARY        = _dereq_('./_library')
+  , $export        = _dereq_('./_export')
+  , redefine       = _dereq_('./_redefine')
+  , hide           = _dereq_('./_hide')
+  , has            = _dereq_('./_has')
+  , Iterators      = _dereq_('./_iterators')
+  , $iterCreate    = _dereq_('./_iter-create')
+  , setToStringTag = _dereq_('./_set-to-string-tag')
+  , getPrototypeOf = _dereq_('./_object-gpo')
+  , ITERATOR       = _dereq_('./_wks')('iterator')
+  , BUGGY          = !([].keys && 'next' in [].keys()) // Safari has buggy iterators w/o `next`
+  , FF_ITERATOR    = '@@iterator'
+  , KEYS           = 'keys'
+  , VALUES         = 'values';
 
-  return parts.join('')
-}
+var returnThis = function(){ return this; };
 
-},{}],4:[function(_dereq_,module,exports){
-exports.read = function (buffer, offset, isLE, mLen, nBytes) {
-  var e, m
-  var eLen = nBytes * 8 - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var nBits = -7
-  var i = isLE ? (nBytes - 1) : 0
-  var d = isLE ? -1 : 1
-  var s = buffer[offset + i]
+module.exports = function(Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCED){
+  $iterCreate(Constructor, NAME, next);
+  var getMethod = function(kind){
+    if(!BUGGY && kind in proto)return proto[kind];
+    switch(kind){
+      case KEYS: return function keys(){ return new Constructor(this, kind); };
+      case VALUES: return function values(){ return new Constructor(this, kind); };
+    } return function entries(){ return new Constructor(this, kind); };
+  };
+  var TAG        = NAME + ' Iterator'
+    , DEF_VALUES = DEFAULT == VALUES
+    , VALUES_BUG = false
+    , proto      = Base.prototype
+    , $native    = proto[ITERATOR] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT]
+    , $default   = $native || getMethod(DEFAULT)
+    , $entries   = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined
+    , $anyNative = NAME == 'Array' ? proto.entries || $native : $native
+    , methods, key, IteratorPrototype;
+  // Fix native
+  if($anyNative){
+    IteratorPrototype = getPrototypeOf($anyNative.call(new Base));
+    if(IteratorPrototype !== Object.prototype){
+      // Set @@toStringTag to native iterators
+      setToStringTag(IteratorPrototype, TAG, true);
+      // fix for some old engines
+      if(!LIBRARY && !has(IteratorPrototype, ITERATOR))hide(IteratorPrototype, ITERATOR, returnThis);
+    }
+  }
+  // fix Array#{values, @@iterator}.name in V8 / FF
+  if(DEF_VALUES && $native && $native.name !== VALUES){
+    VALUES_BUG = true;
+    $default = function values(){ return $native.call(this); };
+  }
+  // Define iterator
+  if((!LIBRARY || FORCED) && (BUGGY || VALUES_BUG || !proto[ITERATOR])){
+    hide(proto, ITERATOR, $default);
+  }
+  // Plug for library
+  Iterators[NAME] = $default;
+  Iterators[TAG]  = returnThis;
+  if(DEFAULT){
+    methods = {
+      values:  DEF_VALUES ? $default : getMethod(VALUES),
+      keys:    IS_SET     ? $default : getMethod(KEYS),
+      entries: $entries
+    };
+    if(FORCED)for(key in methods){
+      if(!(key in proto))redefine(proto, key, methods[key]);
+    } else $export($export.P + $export.F * (BUGGY || VALUES_BUG), NAME, methods);
+  }
+  return methods;
+};
+},{"./_export":20,"./_has":24,"./_hide":25,"./_iter-create":33,"./_iterators":37,"./_library":38,"./_object-gpo":43,"./_redefine":48,"./_set-to-string-tag":50,"./_wks":63}],35:[function(_dereq_,module,exports){
+var ITERATOR     = _dereq_('./_wks')('iterator')
+  , SAFE_CLOSING = false;
 
-  i += d
+try {
+  var riter = [7][ITERATOR]();
+  riter['return'] = function(){ SAFE_CLOSING = true; };
+  Array.from(riter, function(){ throw 2; });
+} catch(e){ /* empty */ }
 
-  e = s & ((1 << (-nBits)) - 1)
-  s >>= (-nBits)
-  nBits += eLen
-  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+module.exports = function(exec, skipClosing){
+  if(!skipClosing && !SAFE_CLOSING)return false;
+  var safe = false;
+  try {
+    var arr  = [7]
+      , iter = arr[ITERATOR]();
+    iter.next = function(){ return {done: safe = true}; };
+    arr[ITERATOR] = function(){ return iter; };
+    exec(arr);
+  } catch(e){ /* empty */ }
+  return safe;
+};
+},{"./_wks":63}],36:[function(_dereq_,module,exports){
+module.exports = function(done, value){
+  return {value: value, done: !!done};
+};
+},{}],37:[function(_dereq_,module,exports){
+module.exports = {};
+},{}],38:[function(_dereq_,module,exports){
+module.exports = false;
+},{}],39:[function(_dereq_,module,exports){
+var global    = _dereq_('./_global')
+  , macrotask = _dereq_('./_task').set
+  , Observer  = global.MutationObserver || global.WebKitMutationObserver
+  , process   = global.process
+  , Promise   = global.Promise
+  , isNode    = _dereq_('./_cof')(process) == 'process';
 
-  m = e & ((1 << (-nBits)) - 1)
-  e >>= (-nBits)
-  nBits += mLen
-  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+module.exports = function(){
+  var head, last, notify;
 
-  if (e === 0) {
-    e = 1 - eBias
-  } else if (e === eMax) {
-    return m ? NaN : ((s ? -1 : 1) * Infinity)
-  } else {
-    m = m + Math.pow(2, mLen)
-    e = e - eBias
-  }
-  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
-}
+  var flush = function(){
+    var parent, fn;
+    if(isNode && (parent = process.domain))parent.exit();
+    while(head){
+      fn   = head.fn;
+      head = head.next;
+      try {
+        fn();
+      } catch(e){
+        if(head)notify();
+        else last = undefined;
+        throw e;
+      }
+    } last = undefined;
+    if(parent)parent.enter();
+  };
 
-exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
-  var e, m, c
-  var eLen = nBytes * 8 - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
-  var i = isLE ? 0 : (nBytes - 1)
-  var d = isLE ? 1 : -1
-  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
-
-  value = Math.abs(value)
-
-  if (isNaN(value) || value === Infinity) {
-    m = isNaN(value) ? 1 : 0
-    e = eMax
+  // Node.js
+  if(isNode){
+    notify = function(){
+      process.nextTick(flush);
+    };
+  // browsers with MutationObserver
+  } else if(Observer){
+    var toggle = true
+      , node   = document.createTextNode('');
+    new Observer(flush).observe(node, {characterData: true}); // eslint-disable-line no-new
+    notify = function(){
+      node.data = toggle = !toggle;
+    };
+  // environments with maybe non-completely correct, but existent Promise
+  } else if(Promise && Promise.resolve){
+    var promise = Promise.resolve();
+    notify = function(){
+      promise.then(flush);
+    };
+  // for other environments - macrotask based on:
+  // - setImmediate
+  // - MessageChannel
+  // - window.postMessag
+  // - onreadystatechange
+  // - setTimeout
   } else {
-    e = Math.floor(Math.log(value) / Math.LN2)
-    if (value * (c = Math.pow(2, -e)) < 1) {
-      e--
-      c *= 2
-    }
-    if (e + eBias >= 1) {
-      value += rt / c
-    } else {
-      value += rt * Math.pow(2, 1 - eBias)
-    }
-    if (value * c >= 2) {
-      e++
-      c /= 2
-    }
-
-    if (e + eBias >= eMax) {
-      m = 0
-      e = eMax
-    } else if (e + eBias >= 1) {
-      m = (value * c - 1) * Math.pow(2, mLen)
-      e = e + eBias
-    } else {
-      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
-      e = 0
-    }
+    notify = function(){
+      // strange IE + webpack dev server bug - use .call(global)
+      macrotask.call(global, flush);
+    };
   }
 
-  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
-
-  e = (e << mLen) | m
-  eLen += mLen
-  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
-
-  buffer[offset + i - d] |= s * 128
-}
-
-},{}],5:[function(_dereq_,module,exports){
-var toString = {}.toString;
-
-module.exports = Array.isArray || function (arr) {
-  return toString.call(arr) == '[object Array]';
+  return function(fn){
+    var task = {fn: fn, next: undefined};
+    if(last)last.next = task;
+    if(!head){
+      head = task;
+      notify();
+    } last = task;
+  };
 };
+},{"./_cof":13,"./_global":23,"./_task":55}],40:[function(_dereq_,module,exports){
+// 19.1.2.2 / 15.2.3.5 Object.create(O [, Properties])
+var anObject    = _dereq_('./_an-object')
+  , dPs         = _dereq_('./_object-dps')
+  , enumBugKeys = _dereq_('./_enum-bug-keys')
+  , IE_PROTO    = _dereq_('./_shared-key')('IE_PROTO')
+  , Empty       = function(){ /* empty */ }
+  , PROTOTYPE   = 'prototype';
 
-},{}],6:[function(_dereq_,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-function EventEmitter() {
-  this._events = this._events || {};
-  this._maxListeners = this._maxListeners || undefined;
-}
-module.exports = EventEmitter;
-
-// Backwards-compat with node 0.10.x
-EventEmitter.EventEmitter = EventEmitter;
-
-EventEmitter.prototype._events = undefined;
-EventEmitter.prototype._maxListeners = undefined;
-
-// By default EventEmitters will print a warning if more than 10 listeners are
-// added to it. This is a useful default which helps finding memory leaks.
-EventEmitter.defaultMaxListeners = 10;
-
-// Obviously not all Emitters should be limited to 10. This function allows
-// that to be increased. Set to zero for unlimited.
-EventEmitter.prototype.setMaxListeners = function(n) {
-  if (!isNumber(n) || n < 0 || isNaN(n))
-    throw TypeError('n must be a positive number');
-  this._maxListeners = n;
-  return this;
+// Create object with fake `null` prototype: use iframe Object with cleared prototype
+var createDict = function(){
+  // Thrash, waste and sodomy: IE GC bug
+  var iframe = _dereq_('./_dom-create')('iframe')
+    , i      = enumBugKeys.length
+    , lt     = '<'
+    , gt     = '>'
+    , iframeDocument;
+  iframe.style.display = 'none';
+  _dereq_('./_html').appendChild(iframe);
+  iframe.src = 'javascript:'; // eslint-disable-line no-script-url
+  // createDict = iframe.contentWindow.Object;
+  // html.removeChild(iframe);
+  iframeDocument = iframe.contentWindow.document;
+  iframeDocument.open();
+  iframeDocument.write(lt + 'script' + gt + 'document.F=Object' + lt + '/script' + gt);
+  iframeDocument.close();
+  createDict = iframeDocument.F;
+  while(i--)delete createDict[PROTOTYPE][enumBugKeys[i]];
+  return createDict();
 };
 
-EventEmitter.prototype.emit = function(type) {
-  var er, handler, len, args, i, listeners;
-
-  if (!this._events)
-    this._events = {};
-
-  // If there is no 'error' event listener then throw.
-  if (type === 'error') {
-    if (!this._events.error ||
-        (isObject(this._events.error) && !this._events.error.length)) {
-      er = arguments[1];
-      if (er instanceof Error) {
-        throw er; // Unhandled 'error' event
-      } else {
-        // At least give some kind of context to the user
-        var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
-        err.context = er;
-        throw err;
-      }
-    }
-  }
-
-  handler = this._events[type];
-
-  if (isUndefined(handler))
-    return false;
-
-  if (isFunction(handler)) {
-    switch (arguments.length) {
-      // fast cases
-      case 1:
-        handler.call(this);
-        break;
-      case 2:
-        handler.call(this, arguments[1]);
-        break;
-      case 3:
-        handler.call(this, arguments[1], arguments[2]);
-        break;
-      // slower
-      default:
-        args = Array.prototype.slice.call(arguments, 1);
-        handler.apply(this, args);
-    }
-  } else if (isObject(handler)) {
-    args = Array.prototype.slice.call(arguments, 1);
-    listeners = handler.slice();
-    len = listeners.length;
-    for (i = 0; i < len; i++)
-      listeners[i].apply(this, args);
-  }
-
-  return true;
+module.exports = Object.create || function create(O, Properties){
+  var result;
+  if(O !== null){
+    Empty[PROTOTYPE] = anObject(O);
+    result = new Empty;
+    Empty[PROTOTYPE] = null;
+    // add "__proto__" for Object.getPrototypeOf polyfill
+    result[IE_PROTO] = O;
+  } else result = createDict();
+  return Properties === undefined ? result : dPs(result, Properties);
 };
 
-EventEmitter.prototype.addListener = function(type, listener) {
-  var m;
-
-  if (!isFunction(listener))
-    throw TypeError('listener must be a function');
-
-  if (!this._events)
-    this._events = {};
-
-  // To avoid recursion in the case that type === "newListener"! Before
-  // adding it to the listeners, first emit "newListener".
-  if (this._events.newListener)
-    this.emit('newListener', type,
-              isFunction(listener.listener) ?
-              listener.listener : listener);
-
-  if (!this._events[type])
-    // Optimize the case of one listener. Don't need the extra array object.
-    this._events[type] = listener;
-  else if (isObject(this._events[type]))
-    // If we've already got an array, just append.
-    this._events[type].push(listener);
-  else
-    // Adding the second element, need to change to array.
-    this._events[type] = [this._events[type], listener];
-
-  // Check for listener leak
-  if (isObject(this._events[type]) && !this._events[type].warned) {
-    if (!isUndefined(this._maxListeners)) {
-      m = this._maxListeners;
-    } else {
-      m = EventEmitter.defaultMaxListeners;
-    }
-
-    if (m && m > 0 && this._events[type].length > m) {
-      this._events[type].warned = true;
-      console.error('(node) warning: possible EventEmitter memory ' +
-                    'leak detected. %d listeners added. ' +
-                    'Use emitter.setMaxListeners() to increase limit.',
-                    this._events[type].length);
-      if (typeof console.trace === 'function') {
-        // not supported in IE 10
-        console.trace();
-      }
-    }
-  }
+},{"./_an-object":10,"./_dom-create":18,"./_enum-bug-keys":19,"./_html":26,"./_object-dps":42,"./_shared-key":51}],41:[function(_dereq_,module,exports){
+var anObject       = _dereq_('./_an-object')
+  , IE8_DOM_DEFINE = _dereq_('./_ie8-dom-define')
+  , toPrimitive    = _dereq_('./_to-primitive')
+  , dP             = Object.defineProperty;
 
-  return this;
+exports.f = _dereq_('./_descriptors') ? Object.defineProperty : function defineProperty(O, P, Attributes){
+  anObject(O);
+  P = toPrimitive(P, true);
+  anObject(Attributes);
+  if(IE8_DOM_DEFINE)try {
+    return dP(O, P, Attributes);
+  } catch(e){ /* empty */ }
+  if('get' in Attributes || 'set' in Attributes)throw TypeError('Accessors not supported!');
+  if('value' in Attributes)O[P] = Attributes.value;
+  return O;
 };
+},{"./_an-object":10,"./_descriptors":17,"./_ie8-dom-define":27,"./_to-primitive":61}],42:[function(_dereq_,module,exports){
+var dP       = _dereq_('./_object-dp')
+  , anObject = _dereq_('./_an-object')
+  , getKeys  = _dereq_('./_object-keys');
 
-EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-EventEmitter.prototype.once = function(type, listener) {
-  if (!isFunction(listener))
-    throw TypeError('listener must be a function');
-
-  var fired = false;
-
-  function g() {
-    this.removeListener(type, g);
-
-    if (!fired) {
-      fired = true;
-      listener.apply(this, arguments);
-    }
-  }
-
-  g.listener = listener;
-  this.on(type, g);
-
-  return this;
+module.exports = _dereq_('./_descriptors') ? Object.defineProperties : function defineProperties(O, Properties){
+  anObject(O);
+  var keys   = getKeys(Properties)
+    , length = keys.length
+    , i = 0
+    , P;
+  while(length > i)dP.f(O, P = keys[i++], Properties[P]);
+  return O;
 };
+},{"./_an-object":10,"./_descriptors":17,"./_object-dp":41,"./_object-keys":45}],43:[function(_dereq_,module,exports){
+// 19.1.2.9 / 15.2.3.2 Object.getPrototypeOf(O)
+var has         = _dereq_('./_has')
+  , toObject    = _dereq_('./_to-object')
+  , IE_PROTO    = _dereq_('./_shared-key')('IE_PROTO')
+  , ObjectProto = Object.prototype;
 
-// emits a 'removeListener' event iff the listener was removed
-EventEmitter.prototype.removeListener = function(type, listener) {
-  var list, position, length, i;
-
-  if (!isFunction(listener))
-    throw TypeError('listener must be a function');
-
-  if (!this._events || !this._events[type])
-    return this;
-
-  list = this._events[type];
-  length = list.length;
-  position = -1;
-
-  if (list === listener ||
-      (isFunction(list.listener) && list.listener === listener)) {
-    delete this._events[type];
-    if (this._events.removeListener)
-      this.emit('removeListener', type, listener);
-
-  } else if (isObject(list)) {
-    for (i = length; i-- > 0;) {
-      if (list[i] === listener ||
-          (list[i].listener && list[i].listener === listener)) {
-        position = i;
-        break;
-      }
-    }
-
-    if (position < 0)
-      return this;
-
-    if (list.length === 1) {
-      list.length = 0;
-      delete this._events[type];
-    } else {
-      list.splice(position, 1);
-    }
+module.exports = Object.getPrototypeOf || function(O){
+  O = toObject(O);
+  if(has(O, IE_PROTO))return O[IE_PROTO];
+  if(typeof O.constructor == 'function' && O instanceof O.constructor){
+    return O.constructor.prototype;
+  } return O instanceof Object ? ObjectProto : null;
+};
+},{"./_has":24,"./_shared-key":51,"./_to-object":60}],44:[function(_dereq_,module,exports){
+var has          = _dereq_('./_has')
+  , toIObject    = _dereq_('./_to-iobject')
+  , arrayIndexOf = _dereq_('./_array-includes')(false)
+  , IE_PROTO     = _dereq_('./_shared-key')('IE_PROTO');
 
-    if (this._events.removeListener)
-      this.emit('removeListener', type, listener);
+module.exports = function(object, names){
+  var O      = toIObject(object)
+    , i      = 0
+    , result = []
+    , key;
+  for(key in O)if(key != IE_PROTO)has(O, key) && result.push(key);
+  // Don't enum bug & hidden keys
+  while(names.length > i)if(has(O, key = names[i++])){
+    ~arrayIndexOf(result, key) || result.push(key);
   }
-
-  return this;
+  return result;
 };
+},{"./_array-includes":11,"./_has":24,"./_shared-key":51,"./_to-iobject":58}],45:[function(_dereq_,module,exports){
+// 19.1.2.14 / 15.2.3.14 Object.keys(O)
+var $keys       = _dereq_('./_object-keys-internal')
+  , enumBugKeys = _dereq_('./_enum-bug-keys');
 
-EventEmitter.prototype.removeAllListeners = function(type) {
-  var key, listeners;
-
-  if (!this._events)
-    return this;
+module.exports = Object.keys || function keys(O){
+  return $keys(O, enumBugKeys);
+};
+},{"./_enum-bug-keys":19,"./_object-keys-internal":44}],46:[function(_dereq_,module,exports){
+module.exports = function(bitmap, value){
+  return {
+    enumerable  : !(bitmap & 1),
+    configurable: !(bitmap & 2),
+    writable    : !(bitmap & 4),
+    value       : value
+  };
+};
+},{}],47:[function(_dereq_,module,exports){
+var redefine = _dereq_('./_redefine');
+module.exports = function(target, src, safe){
+  for(var key in src)redefine(target, key, src[key], safe);
+  return target;
+};
+},{"./_redefine":48}],48:[function(_dereq_,module,exports){
+var global    = _dereq_('./_global')
+  , hide      = _dereq_('./_hide')
+  , has       = _dereq_('./_has')
+  , SRC       = _dereq_('./_uid')('src')
+  , TO_STRING = 'toString'
+  , $toString = Function[TO_STRING]
+  , TPL       = ('' + $toString).split(TO_STRING);
 
-  // not listening for removeListener, no need to emit
-  if (!this._events.removeListener) {
-    if (arguments.length === 0)
-      this._events = {};
-    else if (this._events[type])
-      delete this._events[type];
-    return this;
-  }
+_dereq_('./_core').inspectSource = function(it){
+  return $toString.call(it);
+};
 
-  // emit removeListener for all listeners on all events
-  if (arguments.length === 0) {
-    for (key in this._events) {
-      if (key === 'removeListener') continue;
-      this.removeAllListeners(key);
+(module.exports = function(O, key, val, safe){
+  var isFunction = typeof val == 'function';
+  if(isFunction)has(val, 'name') || hide(val, 'name', key);
+  if(O[key] === val)return;
+  if(isFunction)has(val, SRC) || hide(val, SRC, O[key] ? '' + O[key] : TPL.join(String(key)));
+  if(O === global){
+    O[key] = val;
+  } else {
+    if(!safe){
+      delete O[key];
+      hide(O, key, val);
+    } else {
+      if(O[key])O[key] = val;
+      else hide(O, key, val);
     }
-    this.removeAllListeners('removeListener');
-    this._events = {};
-    return this;
-  }
-
-  listeners = this._events[type];
-
-  if (isFunction(listeners)) {
-    this.removeListener(type, listeners);
-  } else if (listeners) {
-    // LIFO order
-    while (listeners.length)
-      this.removeListener(type, listeners[listeners.length - 1]);
   }
-  delete this._events[type];
+// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
+})(Function.prototype, TO_STRING, function toString(){
+  return typeof this == 'function' && this[SRC] || $toString.call(this);
+});
+},{"./_core":14,"./_global":23,"./_has":24,"./_hide":25,"./_uid":62}],49:[function(_dereq_,module,exports){
+'use strict';
+var global      = _dereq_('./_global')
+  , dP          = _dereq_('./_object-dp')
+  , DESCRIPTORS = _dereq_('./_descriptors')
+  , SPECIES     = _dereq_('./_wks')('species');
 
-  return this;
+module.exports = function(KEY){
+  var C = global[KEY];
+  if(DESCRIPTORS && C && !C[SPECIES])dP.f(C, SPECIES, {
+    configurable: true,
+    get: function(){ return this; }
+  });
 };
+},{"./_descriptors":17,"./_global":23,"./_object-dp":41,"./_wks":63}],50:[function(_dereq_,module,exports){
+var def = _dereq_('./_object-dp').f
+  , has = _dereq_('./_has')
+  , TAG = _dereq_('./_wks')('toStringTag');
 
-EventEmitter.prototype.listeners = function(type) {
-  var ret;
-  if (!this._events || !this._events[type])
-    ret = [];
-  else if (isFunction(this._events[type]))
-    ret = [this._events[type]];
-  else
-    ret = this._events[type].slice();
-  return ret;
+module.exports = function(it, tag, stat){
+  if(it && !has(it = stat ? it : it.prototype, TAG))def(it, TAG, {configurable: true, value: tag});
 };
-
-EventEmitter.prototype.listenerCount = function(type) {
-  if (this._events) {
-    var evlistener = this._events[type];
-
-    if (isFunction(evlistener))
-      return 1;
-    else if (evlistener)
-      return evlistener.length;
-  }
-  return 0;
+},{"./_has":24,"./_object-dp":41,"./_wks":63}],51:[function(_dereq_,module,exports){
+var shared = _dereq_('./_shared')('keys')
+  , uid    = _dereq_('./_uid');
+module.exports = function(key){
+  return shared[key] || (shared[key] = uid(key));
 };
-
-EventEmitter.listenerCount = function(emitter, type) {
-  return emitter.listenerCount(type);
+},{"./_shared":52,"./_uid":62}],52:[function(_dereq_,module,exports){
+var global = _dereq_('./_global')
+  , SHARED = '__core-js_shared__'
+  , store  = global[SHARED] || (global[SHARED] = {});
+module.exports = function(key){
+  return store[key] || (store[key] = {});
 };
-
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-
-function isNumber(arg) {
-  return typeof arg === 'number';
-}
-
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
+},{"./_global":23}],53:[function(_dereq_,module,exports){
+// 7.3.20 SpeciesConstructor(O, defaultConstructor)
+var anObject  = _dereq_('./_an-object')
+  , aFunction = _dereq_('./_a-function')
+  , SPECIES   = _dereq_('./_wks')('species');
+module.exports = function(O, D){
+  var C = anObject(O).constructor, S;
+  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? D : aFunction(S);
+};
+},{"./_a-function":7,"./_an-object":10,"./_wks":63}],54:[function(_dereq_,module,exports){
+var toInteger = _dereq_('./_to-integer')
+  , defined   = _dereq_('./_defined');
+// true  -> String#at
+// false -> String#codePointAt
+module.exports = function(TO_STRING){
+  return function(that, pos){
+    var s = String(defined(that))
+      , i = toInteger(pos)
+      , l = s.length
+      , a, b;
+    if(i < 0 || i >= l)return TO_STRING ? '' : undefined;
+    a = s.charCodeAt(i);
+    return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff
+      ? TO_STRING ? s.charAt(i) : a
+      : TO_STRING ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000;
+  };
+};
+},{"./_defined":16,"./_to-integer":57}],55:[function(_dereq_,module,exports){
+var ctx                = _dereq_('./_ctx')
+  , invoke             = _dereq_('./_invoke')
+  , html               = _dereq_('./_html')
+  , cel                = _dereq_('./_dom-create')
+  , global             = _dereq_('./_global')
+  , process            = global.process
+  , setTask            = global.setImmediate
+  , clearTask          = global.clearImmediate
+  , MessageChannel     = global.MessageChannel
+  , counter            = 0
+  , queue              = {}
+  , ONREADYSTATECHANGE = 'onreadystatechange'
+  , defer, channel, port;
+var run = function(){
+  var id = +this;
+  if(queue.hasOwnProperty(id)){
+    var fn = queue[id];
+    delete queue[id];
+    fn();
+  }
+};
+var listener = function(event){
+  run.call(event.data);
+};
+// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
+if(!setTask || !clearTask){
+  setTask = function setImmediate(fn){
+    var args = [], i = 1;
+    while(arguments.length > i)args.push(arguments[i++]);
+    queue[++counter] = function(){
+      invoke(typeof fn == 'function' ? fn : Function(fn), args);
+    };
+    defer(counter);
+    return counter;
+  };
+  clearTask = function clearImmediate(id){
+    delete queue[id];
+  };
+  // Node.js 0.8-
+  if(_dereq_('./_cof')(process) == 'process'){
+    defer = function(id){
+      process.nextTick(ctx(run, id, 1));
+    };
+  // Browsers with MessageChannel, includes WebWorkers
+  } else if(MessageChannel){
+    channel = new MessageChannel;
+    port    = channel.port2;
+    channel.port1.onmessage = listener;
+    defer = ctx(port.postMessage, port, 1);
+  // Browsers with postMessage, skip WebWorkers
+  // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
+  } else if(global.addEventListener && typeof postMessage == 'function' && !global.importScripts){
+    defer = function(id){
+      global.postMessage(id + '', '*');
+    };
+    global.addEventListener('message', listener, false);
+  // IE8-
+  } else if(ONREADYSTATECHANGE in cel('script')){
+    defer = function(id){
+      html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function(){
+        html.removeChild(this);
+        run.call(id);
+      };
+    };
+  // Rest old browsers
+  } else {
+    defer = function(id){
+      setTimeout(ctx(run, id, 1), 0);
+    };
+  }
 }
+module.exports = {
+  set:   setTask,
+  clear: clearTask
+};
+},{"./_cof":13,"./_ctx":15,"./_dom-create":18,"./_global":23,"./_html":26,"./_invoke":28}],56:[function(_dereq_,module,exports){
+var toInteger = _dereq_('./_to-integer')
+  , max       = Math.max
+  , min       = Math.min;
+module.exports = function(index, length){
+  index = toInteger(index);
+  return index < 0 ? max(index + length, 0) : min(index, length);
+};
+},{"./_to-integer":57}],57:[function(_dereq_,module,exports){
+// 7.1.4 ToInteger
+var ceil  = Math.ceil
+  , floor = Math.floor;
+module.exports = function(it){
+  return isNaN(it = +it) ? 0 : (it > 0 ? floor : ceil)(it);
+};
+},{}],58:[function(_dereq_,module,exports){
+// to indexed object, toObject with fallback for non-array-like ES3 strings
+var IObject = _dereq_('./_iobject')
+  , defined = _dereq_('./_defined');
+module.exports = function(it){
+  return IObject(defined(it));
+};
+},{"./_defined":16,"./_iobject":29}],59:[function(_dereq_,module,exports){
+// 7.1.15 ToLength
+var toInteger = _dereq_('./_to-integer')
+  , min       = Math.min;
+module.exports = function(it){
+  return it > 0 ? min(toInteger(it), 0x1fffffffffffff) : 0; // pow(2, 53) - 1 == 9007199254740991
+};
+},{"./_to-integer":57}],60:[function(_dereq_,module,exports){
+// 7.1.13 ToObject(argument)
+var defined = _dereq_('./_defined');
+module.exports = function(it){
+  return Object(defined(it));
+};
+},{"./_defined":16}],61:[function(_dereq_,module,exports){
+// 7.1.1 ToPrimitive(input [, PreferredType])
+var isObject = _dereq_('./_is-object');
+// instead of the ES6 spec version, we didn't implement @@toPrimitive case
+// and the second argument - flag - preferred type is a string
+module.exports = function(it, S){
+  if(!isObject(it))return it;
+  var fn, val;
+  if(S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it)))return val;
+  if(typeof (fn = it.valueOf) == 'function' && !isObject(val = fn.call(it)))return val;
+  if(!S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it)))return val;
+  throw TypeError("Can't convert object to primitive value");
+};
+},{"./_is-object":31}],62:[function(_dereq_,module,exports){
+var id = 0
+  , px = Math.random();
+module.exports = function(key){
+  return 'Symbol('.concat(key === undefined ? '' : key, ')_', (++id + px).toString(36));
+};
+},{}],63:[function(_dereq_,module,exports){
+var store      = _dereq_('./_shared')('wks')
+  , uid        = _dereq_('./_uid')
+  , Symbol     = _dereq_('./_global').Symbol
+  , USE_SYMBOL = typeof Symbol == 'function';
 
-function isUndefined(arg) {
-  return arg === void 0;
-}
+var $exports = module.exports = function(name){
+  return store[name] || (store[name] =
+    USE_SYMBOL && Symbol[name] || (USE_SYMBOL ? Symbol : uid)('Symbol.' + name));
+};
 
-},{}],7:[function(_dereq_,module,exports){
-/*!
- * Determine if an object is a Buffer
- *
- * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
- * @license  MIT
- */
+$exports.store = store;
+},{"./_global":23,"./_shared":52,"./_uid":62}],64:[function(_dereq_,module,exports){
+var classof   = _dereq_('./_classof')
+  , ITERATOR  = _dereq_('./_wks')('iterator')
+  , Iterators = _dereq_('./_iterators');
+module.exports = _dereq_('./_core').getIteratorMethod = function(it){
+  if(it != undefined)return it[ITERATOR]
+    || it['@@iterator']
+    || Iterators[classof(it)];
+};
+},{"./_classof":12,"./_core":14,"./_iterators":37,"./_wks":63}],65:[function(_dereq_,module,exports){
+'use strict';
+var addToUnscopables = _dereq_('./_add-to-unscopables')
+  , step             = _dereq_('./_iter-step')
+  , Iterators        = _dereq_('./_iterators')
+  , toIObject        = _dereq_('./_to-iobject');
 
-// The _isBuffer check is for Safari 5-7 support, because it's missing
-// Object.prototype.constructor. Remove this eventually
-module.exports = function (obj) {
-  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
-}
+// 22.1.3.4 Array.prototype.entries()
+// 22.1.3.13 Array.prototype.keys()
+// 22.1.3.29 Array.prototype.values()
+// 22.1.3.30 Array.prototype[@@iterator]()
+module.exports = _dereq_('./_iter-define')(Array, 'Array', function(iterated, kind){
+  this._t = toIObject(iterated); // target
+  this._i = 0;                   // next index
+  this._k = kind;                // kind
+// 22.1.5.2.1 %ArrayIteratorPrototype%.next()
+}, function(){
+  var O     = this._t
+    , kind  = this._k
+    , index = this._i++;
+  if(!O || index >= O.length){
+    this._t = undefined;
+    return step(1);
+  }
+  if(kind == 'keys'  )return step(0, index);
+  if(kind == 'values')return step(0, O[index]);
+  return step(0, [index, O[index]]);
+}, 'values');
 
-function isBuffer (obj) {
-  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
-}
+// argumentsList[@@iterator] is %ArrayProto_values% (9.4.4.6, 9.4.4.7)
+Iterators.Arguments = Iterators.Array;
 
-// For Node v0.10 support. Remove this eventually.
-function isSlowBuffer (obj) {
-  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
+addToUnscopables('keys');
+addToUnscopables('values');
+addToUnscopables('entries');
+},{"./_add-to-unscopables":8,"./_iter-define":34,"./_iter-step":36,"./_iterators":37,"./_to-iobject":58}],66:[function(_dereq_,module,exports){
+'use strict';
+// 19.1.3.6 Object.prototype.toString()
+var classof = _dereq_('./_classof')
+  , test    = {};
+test[_dereq_('./_wks')('toStringTag')] = 'z';
+if(test + '' != '[object z]'){
+  _dereq_('./_redefine')(Object.prototype, 'toString', function toString(){
+    return '[object ' + classof(this) + ']';
+  }, true);
 }
+},{"./_classof":12,"./_redefine":48,"./_wks":63}],67:[function(_dereq_,module,exports){
+'use strict';
+var LIBRARY            = _dereq_('./_library')
+  , global             = _dereq_('./_global')
+  , ctx                = _dereq_('./_ctx')
+  , classof            = _dereq_('./_classof')
+  , $export            = _dereq_('./_export')
+  , isObject           = _dereq_('./_is-object')
+  , aFunction          = _dereq_('./_a-function')
+  , anInstance         = _dereq_('./_an-instance')
+  , forOf              = _dereq_('./_for-of')
+  , speciesConstructor = _dereq_('./_species-constructor')
+  , task               = _dereq_('./_task').set
+  , microtask          = _dereq_('./_microtask')()
+  , PROMISE            = 'Promise'
+  , TypeError          = global.TypeError
+  , process            = global.process
+  , $Promise           = global[PROMISE]
+  , process            = global.process
+  , isNode             = classof(process) == 'process'
+  , empty              = function(){ /* empty */ }
+  , Internal, GenericPromiseCapability, Wrapper;
 
-},{}],8:[function(_dereq_,module,exports){
-// shim for using process in browser
-var process = module.exports = {};
-
-// cached from whatever global is present so that test runners that stub it
-// don't break things.  But we need to wrap it in a try catch in case it is
-// wrapped in strict mode code which doesn't define any globals.  It's inside a
-// function because try/catches deoptimize in certain engines.
-
-var cachedSetTimeout;
-var cachedClearTimeout;
+var USE_NATIVE = !!function(){
+  try {
+    // correct subclassing with @@species support
+    var promise     = $Promise.resolve(1)
+      , FakePromise = (promise.constructor = {})[_dereq_('./_wks')('species')] = function(exec){ exec(empty, empty); };
+    // unhandled rejections tracking support, NodeJS Promise without it fails @@species test
+    return (isNode || typeof PromiseRejectionEvent == 'function') && promise.then(empty) instanceof FakePromise;
+  } catch(e){ /* empty */ }
+}();
 
-function defaultSetTimout() {
-    throw new Error('setTimeout has not been defined');
-}
-function defaultClearTimeout () {
-    throw new Error('clearTimeout has not been defined');
-}
-(function () {
-    try {
-        if (typeof setTimeout === 'function') {
-            cachedSetTimeout = setTimeout;
-        } else {
-            cachedSetTimeout = defaultSetTimout;
-        }
-    } catch (e) {
-        cachedSetTimeout = defaultSetTimout;
-    }
-    try {
-        if (typeof clearTimeout === 'function') {
-            cachedClearTimeout = clearTimeout;
-        } else {
-            cachedClearTimeout = defaultClearTimeout;
+// helpers
+var sameConstructor = function(a, b){
+  // with library wrapper special case
+  return a === b || a === $Promise && b === Wrapper;
+};
+var isThenable = function(it){
+  var then;
+  return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
+};
+var newPromiseCapability = function(C){
+  return sameConstructor($Promise, C)
+    ? new PromiseCapability(C)
+    : new GenericPromiseCapability(C);
+};
+var PromiseCapability = GenericPromiseCapability = function(C){
+  var resolve, reject;
+  this.promise = new C(function($$resolve, $$reject){
+    if(resolve !== undefined || reject !== undefined)throw TypeError('Bad Promise constructor');
+    resolve = $$resolve;
+    reject  = $$reject;
+  });
+  this.resolve = aFunction(resolve);
+  this.reject  = aFunction(reject);
+};
+var perform = function(exec){
+  try {
+    exec();
+  } catch(e){
+    return {error: e};
+  }
+};
+var notify = function(promise, isReject){
+  if(promise._n)return;
+  promise._n = true;
+  var chain = promise._c;
+  microtask(function(){
+    var value = promise._v
+      , ok    = promise._s == 1
+      , i     = 0;
+    var run = function(reaction){
+      var handler = ok ? reaction.ok : reaction.fail
+        , resolve = reaction.resolve
+        , reject  = reaction.reject
+        , domain  = reaction.domain
+        , result, then;
+      try {
+        if(handler){
+          if(!ok){
+            if(promise._h == 2)onHandleUnhandled(promise);
+            promise._h = 1;
+          }
+          if(handler === true)result = value;
+          else {
+            if(domain)domain.enter();
+            result = handler(value);
+            if(domain)domain.exit();
+          }
+          if(result === reaction.promise){
+            reject(TypeError('Promise-chain cycle'));
+          } else if(then = isThenable(result)){
+            then.call(result, resolve, reject);
+          } else resolve(result);
+        } else reject(value);
+      } catch(e){
+        reject(e);
+      }
+    };
+    while(chain.length > i)run(chain[i++]); // variable length - can't use forEach
+    promise._c = [];
+    promise._n = false;
+    if(isReject && !promise._h)onUnhandled(promise);
+  });
+};
+var onUnhandled = function(promise){
+  task.call(global, function(){
+    var value = promise._v
+      , abrupt, handler, console;
+    if(isUnhandled(promise)){
+      abrupt = perform(function(){
+        if(isNode){
+          process.emit('unhandledRejection', value, promise);
+        } else if(handler = global.onunhandledrejection){
+          handler({promise: promise, reason: value});
+        } else if((console = global.console) && console.error){
+          console.error('Unhandled promise rejection', value);
         }
-    } catch (e) {
-        cachedClearTimeout = defaultClearTimeout;
-    }
-} ())
-function runTimeout(fun) {
-    if (cachedSetTimeout === setTimeout) {
-        //normal enviroments in sane situations
-        return setTimeout(fun, 0);
-    }
-    // if setTimeout wasn't available but was latter defined
-    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
-        cachedSetTimeout = setTimeout;
-        return setTimeout(fun, 0);
+      });
+      // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
+      promise._h = isNode || isUnhandled(promise) ? 2 : 1;
+    } promise._a = undefined;
+    if(abrupt)throw abrupt.error;
+  });
+};
+var isUnhandled = function(promise){
+  if(promise._h == 1)return false;
+  var chain = promise._a || promise._c
+    , i     = 0
+    , reaction;
+  while(chain.length > i){
+    reaction = chain[i++];
+    if(reaction.fail || !isUnhandled(reaction.promise))return false;
+  } return true;
+};
+var onHandleUnhandled = function(promise){
+  task.call(global, function(){
+    var handler;
+    if(isNode){
+      process.emit('rejectionHandled', promise);
+    } else if(handler = global.onrejectionhandled){
+      handler({promise: promise, reason: promise._v});
     }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedSetTimeout(fun, 0);
-    } catch(e){
+  });
+};
+var $reject = function(value){
+  var promise = this;
+  if(promise._d)return;
+  promise._d = true;
+  promise = promise._w || promise; // unwrap
+  promise._v = value;
+  promise._s = 2;
+  if(!promise._a)promise._a = promise._c.slice();
+  notify(promise, true);
+};
+var $resolve = function(value){
+  var promise = this
+    , then;
+  if(promise._d)return;
+  promise._d = true;
+  promise = promise._w || promise; // unwrap
+  try {
+    if(promise === value)throw TypeError("Promise can't be resolved itself");
+    if(then = isThenable(value)){
+      microtask(function(){
+        var wrapper = {_w: promise, _d: false}; // wrap
         try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
-            return cachedSetTimeout.call(null, fun, 0);
+          then.call(value, ctx($resolve, wrapper, 1), ctx($reject, wrapper, 1));
         } catch(e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
-            return cachedSetTimeout.call(this, fun, 0);
+          $reject.call(wrapper, e);
         }
+      });
+    } else {
+      promise._v = value;
+      promise._s = 1;
+      notify(promise, false);
     }
+  } catch(e){
+    $reject.call({_w: promise, _d: false}, e); // wrap
+  }
+};
 
-
-}
-function runClearTimeout(marker) {
-    if (cachedClearTimeout === clearTimeout) {
-        //normal enviroments in sane situations
-        return clearTimeout(marker);
-    }
-    // if clearTimeout wasn't available but was latter defined
-    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
-        cachedClearTimeout = clearTimeout;
-        return clearTimeout(marker);
-    }
+// constructor polyfill
+if(!USE_NATIVE){
+  // 25.4.3.1 Promise(executor)
+  $Promise = function Promise(executor){
+    anInstance(this, $Promise, PROMISE, '_h');
+    aFunction(executor);
+    Internal.call(this);
     try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedClearTimeout(marker);
-    } catch (e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
-            return cachedClearTimeout.call(null, marker);
-        } catch (e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
-            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
-            return cachedClearTimeout.call(this, marker);
-        }
-    }
-
-
-
-}
-var queue = [];
-var draining = false;
-var currentQueue;
-var queueIndex = -1;
-
-function cleanUpNextTick() {
-    if (!draining || !currentQueue) {
-        return;
-    }
-    draining = false;
-    if (currentQueue.length) {
-        queue = currentQueue.concat(queue);
-    } else {
-        queueIndex = -1;
+      executor(ctx($resolve, this, 1), ctx($reject, this, 1));
+    } catch(err){
+      $reject.call(this, err);
     }
-    if (queue.length) {
-        drainQueue();
-    }
-}
-
-function drainQueue() {
-    if (draining) {
-        return;
-    }
-    var timeout = runTimeout(cleanUpNextTick);
-    draining = true;
-
-    var len = queue.length;
-    while(len) {
-        currentQueue = queue;
-        queue = [];
-        while (++queueIndex < len) {
-            if (currentQueue) {
-                currentQueue[queueIndex].run();
-            }
-        }
-        queueIndex = -1;
-        len = queue.length;
-    }
-    currentQueue = null;
-    draining = false;
-    runClearTimeout(timeout);
-}
-
-process.nextTick = function (fun) {
-    var args = new Array(arguments.length - 1);
-    if (arguments.length > 1) {
-        for (var i = 1; i < arguments.length; i++) {
-            args[i - 1] = arguments[i];
-        }
-    }
-    queue.push(new Item(fun, args));
-    if (queue.length === 1 && !draining) {
-        runTimeout(drainQueue);
+  };
+  Internal = function Promise(executor){
+    this._c = [];             // <- awaiting reactions
+    this._a = undefined;      // <- checked in isUnhandled reactions
+    this._s = 0;              // <- state
+    this._d = false;          // <- done
+    this._v = undefined;      // <- value
+    this._h = 0;              // <- rejection state, 0 - default, 1 - handled, 2 - unhandled
+    this._n = false;          // <- notify
+  };
+  Internal.prototype = _dereq_('./_redefine-all')($Promise.prototype, {
+    // 25.4.5.3 Promise.prototype.then(onFulfilled, onRejected)
+    then: function then(onFulfilled, onRejected){
+      var reaction    = newPromiseCapability(speciesConstructor(this, $Promise));
+      reaction.ok     = typeof onFulfilled == 'function' ? onFulfilled : true;
+      reaction.fail   = typeof onRejected == 'function' && onRejected;
+      reaction.domain = isNode ? process.domain : undefined;
+      this._c.push(reaction);
+      if(this._a)this._a.push(reaction);
+      if(this._s)notify(this, false);
+      return reaction.promise;
+    },
+    // 25.4.5.1 Promise.prototype.catch(onRejected)
+    'catch': function(onRejected){
+      return this.then(undefined, onRejected);
     }
-};
-
-// v8 likes predictible objects
-function Item(fun, array) {
-    this.fun = fun;
-    this.array = array;
+  });
+  PromiseCapability = function(){
+    var promise  = new Internal;
+    this.promise = promise;
+    this.resolve = ctx($resolve, promise, 1);
+    this.reject  = ctx($reject, promise, 1);
+  };
 }
-Item.prototype.run = function () {
-    this.fun.apply(null, this.array);
-};
-process.title = 'browser';
-process.browser = true;
-process.env = {};
-process.argv = [];
-process.version = ''; // empty string to avoid regexp issues
-process.versions = {};
-
-function noop() {}
-
-process.on = noop;
-process.addListener = noop;
-process.once = noop;
-process.off = noop;
-process.removeListener = noop;
-process.removeAllListeners = noop;
-process.emit = noop;
-
-process.binding = function (name) {
-    throw new Error('process.binding is not supported');
-};
 
-process.cwd = function () { return '/' };
-process.chdir = function (dir) {
-    throw new Error('process.chdir is not supported');
-};
-process.umask = function() { return 0; };
+$export($export.G + $export.W + $export.F * !USE_NATIVE, {Promise: $Promise});
+_dereq_('./_set-to-string-tag')($Promise, PROMISE);
+_dereq_('./_set-species')(PROMISE);
+Wrapper = _dereq_('./_core')[PROMISE];
 
-},{}],9:[function(_dereq_,module,exports){
-if (typeof Object.create === 'function') {
-  // implementation from standard node.js 'util' module
-  module.exports = function inherits(ctor, superCtor) {
-    ctor.super_ = superCtor
-    ctor.prototype = Object.create(superCtor.prototype, {
-      constructor: {
-        value: ctor,
-        enumerable: false,
-        writable: true,
-        configurable: true
-      }
+// statics
+$export($export.S + $export.F * !USE_NATIVE, PROMISE, {
+  // 25.4.4.5 Promise.reject(r)
+  reject: function reject(r){
+    var capability = newPromiseCapability(this)
+      , $$reject   = capability.reject;
+    $$reject(r);
+    return capability.promise;
+  }
+});
+$export($export.S + $export.F * (LIBRARY || !USE_NATIVE), PROMISE, {
+  // 25.4.4.6 Promise.resolve(x)
+  resolve: function resolve(x){
+    // instanceof instead of internal slot check because we should fix it without replacement native Promise core
+    if(x instanceof $Promise && sameConstructor(x.constructor, this))return x;
+    var capability = newPromiseCapability(this)
+      , $$resolve  = capability.resolve;
+    $$resolve(x);
+    return capability.promise;
+  }
+});
+$export($export.S + $export.F * !(USE_NATIVE && _dereq_('./_iter-detect')(function(iter){
+  $Promise.all(iter)['catch'](empty);
+})), PROMISE, {
+  // 25.4.4.1 Promise.all(iterable)
+  all: function all(iterable){
+    var C          = this
+      , capability = newPromiseCapability(C)
+      , resolve    = capability.resolve
+      , reject     = capability.reject;
+    var abrupt = perform(function(){
+      var values    = []
+        , index     = 0
+        , remaining = 1;
+      forOf(iterable, false, function(promise){
+        var $index        = index++
+          , alreadyCalled = false;
+        values.push(undefined);
+        remaining++;
+        C.resolve(promise).then(function(value){
+          if(alreadyCalled)return;
+          alreadyCalled  = true;
+          values[$index] = value;
+          --remaining || resolve(values);
+        }, reject);
+      });
+      --remaining || resolve(values);
     });
-  };
-} else {
-  // old school shim for old browsers
-  module.exports = function inherits(ctor, superCtor) {
-    ctor.super_ = superCtor
-    var TempCtor = function () {}
-    TempCtor.prototype = superCtor.prototype
-    ctor.prototype = new TempCtor()
-    ctor.prototype.constructor = ctor
+    if(abrupt)reject(abrupt.error);
+    return capability.promise;
+  },
+  // 25.4.4.4 Promise.race(iterable)
+  race: function race(iterable){
+    var C          = this
+      , capability = newPromiseCapability(C)
+      , reject     = capability.reject;
+    var abrupt = perform(function(){
+      forOf(iterable, false, function(promise){
+        C.resolve(promise).then(capability.resolve, reject);
+      });
+    });
+    if(abrupt)reject(abrupt.error);
+    return capability.promise;
   }
-}
+});
+},{"./_a-function":7,"./_an-instance":9,"./_classof":12,"./_core":14,"./_ctx":15,"./_export":20,"./_for-of":22,"./_global":23,"./_is-object":31,"./_iter-detect":35,"./_library":38,"./_microtask":39,"./_redefine-all":47,"./_set-species":49,"./_set-to-string-tag":50,"./_species-constructor":53,"./_task":55,"./_wks":63}],68:[function(_dereq_,module,exports){
+'use strict';
+var $at  = _dereq_('./_string-at')(true);
 
-},{}],10:[function(_dereq_,module,exports){
-module.exports = function isBuffer(arg) {
-  return arg && typeof arg === 'object'
-    && typeof arg.copy === 'function'
-    && typeof arg.fill === 'function'
-    && typeof arg.readUInt8 === 'function';
+// 21.1.3.27 String.prototype[@@iterator]()
+_dereq_('./_iter-define')(String, 'String', function(iterated){
+  this._t = String(iterated); // target
+  this._i = 0;                // next index
+// 21.1.5.2.1 %StringIteratorPrototype%.next()
+}, function(){
+  var O     = this._t
+    , index = this._i
+    , point;
+  if(index >= O.length)return {value: undefined, done: true};
+  point = $at(O, index);
+  this._i += point.length;
+  return {value: point, done: false};
+});
+},{"./_iter-define":34,"./_string-at":54}],69:[function(_dereq_,module,exports){
+var $iterators    = _dereq_('./es6.array.iterator')
+  , redefine      = _dereq_('./_redefine')
+  , global        = _dereq_('./_global')
+  , hide          = _dereq_('./_hide')
+  , Iterators     = _dereq_('./_iterators')
+  , wks           = _dereq_('./_wks')
+  , ITERATOR      = wks('iterator')
+  , TO_STRING_TAG = wks('toStringTag')
+  , ArrayValues   = Iterators.Array;
+
+for(var collections = ['NodeList', 'DOMTokenList', 'MediaList', 'StyleSheetList', 'CSSRuleList'], i = 0; i < 5; i++){
+  var NAME       = collections[i]
+    , Collection = global[NAME]
+    , proto      = Collection && Collection.prototype
+    , key;
+  if(proto){
+    if(!proto[ITERATOR])hide(proto, ITERATOR, ArrayValues);
+    if(!proto[TO_STRING_TAG])hide(proto, TO_STRING_TAG, NAME);
+    Iterators[NAME] = ArrayValues;
+    for(key in $iterators)if(!proto[key])redefine(proto, key, $iterators[key], true);
+  }
 }
-},{}],11:[function(_dereq_,module,exports){
-(function (process,global){
+},{"./_global":23,"./_hide":25,"./_iterators":37,"./_redefine":48,"./_wks":63,"./es6.array.iterator":65}],70:[function(_dereq_,module,exports){
+(function (Buffer){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -2567,2653 +3458,1249 @@ module.exports = function isBuffer(arg) {
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-var formatRegExp = /%[sdj%]/g;
-exports.format = function(f) {
-  if (!isString(f)) {
-    var objects = [];
-    for (var i = 0; i < arguments.length; i++) {
-      objects.push(inspect(arguments[i]));
-    }
-    return objects.join(' ');
-  }
-
-  var i = 1;
-  var args = arguments;
-  var len = args.length;
-  var str = String(f).replace(formatRegExp, function(x) {
-    if (x === '%%') return '%';
-    if (i >= len) return x;
-    switch (x) {
-      case '%s': return String(args[i++]);
-      case '%d': return Number(args[i++]);
-      case '%j':
-        try {
-          return JSON.stringify(args[i++]);
-        } catch (_) {
-          return '[Circular]';
-        }
-      default:
-        return x;
-    }
-  });
-  for (var x = args[i]; i < len; x = args[++i]) {
-    if (isNull(x) || !isObject(x)) {
-      str += ' ' + x;
-    } else {
-      str += ' ' + inspect(x);
-    }
-  }
-  return str;
-};
-
-
-// Mark that a method should not be used.
-// Returns a modified function which warns once by default.
-// If --no-deprecation is set, then it is a no-op.
-exports.deprecate = function(fn, msg) {
-  // Allow for deprecating things in the process of starting up.
-  if (isUndefined(global.process)) {
-    return function() {
-      return exports.deprecate(fn, msg).apply(this, arguments);
-    };
-  }
-
-  if (process.noDeprecation === true) {
-    return fn;
-  }
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
 
-  var warned = false;
-  function deprecated() {
-    if (!warned) {
-      if (process.throwDeprecation) {
-        throw new Error(msg);
-      } else if (process.traceDeprecation) {
-        console.trace(msg);
-      } else {
-        console.error(msg);
-      }
-      warned = true;
-    }
-    return fn.apply(this, arguments);
+function isArray(arg) {
+  if (Array.isArray) {
+    return Array.isArray(arg);
   }
+  return objectToString(arg) === '[object Array]';
+}
+exports.isArray = isArray;
 
-  return deprecated;
-};
-
-
-var debugs = {};
-var debugEnviron;
-exports.debuglog = function(set) {
-  if (isUndefined(debugEnviron))
-    debugEnviron = process.env.NODE_DEBUG || '';
-  set = set.toUpperCase();
-  if (!debugs[set]) {
-    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
-      var pid = process.pid;
-      debugs[set] = function() {
-        var msg = exports.format.apply(exports, arguments);
-        console.error('%s %d: %s', set, pid, msg);
-      };
-    } else {
-      debugs[set] = function() {};
-    }
-  }
-  return debugs[set];
-};
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
 
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
 
-/**
- * Echos the value of a value. Trys to print the value out
- * in the best way possible given the different types.
- *
- * @param {Object} obj The object to print out.
- * @param {Object} opts Optional options object that alters the output.
- */
-/* legacy: obj, showHidden, depth, colors*/
-function inspect(obj, opts) {
-  // default options
-  var ctx = {
-    seen: [],
-    stylize: stylizeNoColor
-  };
-  // legacy...
-  if (arguments.length >= 3) ctx.depth = arguments[2];
-  if (arguments.length >= 4) ctx.colors = arguments[3];
-  if (isBoolean(opts)) {
-    // legacy...
-    ctx.showHidden = opts;
-  } else if (opts) {
-    // got an "options" object
-    exports._extend(ctx, opts);
-  }
-  // set default options
-  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
-  if (isUndefined(ctx.depth)) ctx.depth = 2;
-  if (isUndefined(ctx.colors)) ctx.colors = false;
-  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
-  if (ctx.colors) ctx.stylize = stylizeWithColor;
-  return formatValue(ctx, obj, ctx.depth);
+function isNullOrUndefined(arg) {
+  return arg == null;
 }
-exports.inspect = inspect;
+exports.isNullOrUndefined = isNullOrUndefined;
 
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
 
-// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
-inspect.colors = {
-  'bold' : [1, 22],
-  'italic' : [3, 23],
-  'underline' : [4, 24],
-  'inverse' : [7, 27],
-  'white' : [37, 39],
-  'grey' : [90, 39],
-  'black' : [30, 39],
-  'blue' : [34, 39],
-  'cyan' : [36, 39],
-  'green' : [32, 39],
-  'magenta' : [35, 39],
-  'red' : [31, 39],
-  'yellow' : [33, 39]
-};
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
 
-// Don't use 'blue' not visible on cmd.exe
-inspect.styles = {
-  'special': 'cyan',
-  'number': 'yellow',
-  'boolean': 'yellow',
-  'undefined': 'grey',
-  'null': 'bold',
-  'string': 'green',
-  'date': 'magenta',
-  // "name": intentionally not styling
-  'regexp': 'red'
-};
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
 
+function isUndefined(arg) {
+  return arg === void 0;
+}
+exports.isUndefined = isUndefined;
 
-function stylizeWithColor(str, styleType) {
-  var style = inspect.styles[styleType];
+function isRegExp(re) {
+  return objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
 
-  if (style) {
-    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
-           '\u001b[' + inspect.colors[style][1] + 'm';
-  } else {
-    return str;
-  }
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
 }
+exports.isObject = isObject;
 
+function isDate(d) {
+  return objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
 
-function stylizeNoColor(str, styleType) {
-  return str;
+function isError(e) {
+  return (objectToString(e) === '[object Error]' || e instanceof Error);
 }
+exports.isError = isError;
 
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
 
-function arrayToHash(array) {
-  var hash = {};
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
 
-  array.forEach(function(val, idx) {
-    hash[val] = true;
-  });
+exports.isBuffer = Buffer.isBuffer;
 
-  return hash;
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
 }
 
+}).call(this,{"isBuffer":_dereq_("../../is-buffer/index.js")})
 
-function formatValue(ctx, value, recurseTimes) {
-  // Provide a hook for user-specified inspect functions.
-  // Check that value is an object with an inspect function on it
-  if (ctx.customInspect &&
-      value &&
-      isFunction(value.inspect) &&
-      // Filter out the util module, it's inspect function is special
-      value.inspect !== exports.inspect &&
-      // Also filter out any prototype objects using the circular check.
-      !(value.constructor && value.constructor.prototype === value)) {
-    var ret = value.inspect(recurseTimes, ctx);
-    if (!isString(ret)) {
-      ret = formatValue(ctx, ret, recurseTimes);
-    }
-    return ret;
-  }
-
-  // Primitive types cannot have properties
-  var primitive = formatPrimitive(ctx, value);
-  if (primitive) {
-    return primitive;
-  }
+},{"../../is-buffer/index.js":95}],71:[function(_dereq_,module,exports){
+// (c) Dean McNamee <dean@gmail.com>, 2012.
+//
+// https://github.com/deanm/css-color-parser-js
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
 
-  // Look up the keys of the object.
-  var keys = Object.keys(value);
-  var visibleKeys = arrayToHash(keys);
+// http://www.w3.org/TR/css3-color/
+var kCSSColorTable = {
+  "transparent": [0,0,0,0], "aliceblue": [240,248,255,1],
+  "antiquewhite": [250,235,215,1], "aqua": [0,255,255,1],
+  "aquamarine": [127,255,212,1], "azure": [240,255,255,1],
+  "beige": [245,245,220,1], "bisque": [255,228,196,1],
+  "black": [0,0,0,1], "blanchedalmond": [255,235,205,1],
+  "blue": [0,0,255,1], "blueviolet": [138,43,226,1],
+  "brown": [165,42,42,1], "burlywood": [222,184,135,1],
+  "cadetblue": [95,158,160,1], "chartreuse": [127,255,0,1],
+  "chocolate": [210,105,30,1], "coral": [255,127,80,1],
+  "cornflowerblue": [100,149,237,1], "cornsilk": [255,248,220,1],
+  "crimson": [220,20,60,1], "cyan": [0,255,255,1],
+  "darkblue": [0,0,139,1], "darkcyan": [0,139,139,1],
+  "darkgoldenrod": [184,134,11,1], "darkgray": [169,169,169,1],
+  "darkgreen": [0,100,0,1], "darkgrey": [169,169,169,1],
+  "darkkhaki": [189,183,107,1], "darkmagenta": [139,0,139,1],
+  "darkolivegreen": [85,107,47,1], "darkorange": [255,140,0,1],
+  "darkorchid": [153,50,204,1], "darkred": [139,0,0,1],
+  "darksalmon": [233,150,122,1], "darkseagreen": [143,188,143,1],
+  "darkslateblue": [72,61,139,1], "darkslategray": [47,79,79,1],
+  "darkslategrey": [47,79,79,1], "darkturquoise": [0,206,209,1],
+  "darkviolet": [148,0,211,1], "deeppink": [255,20,147,1],
+  "deepskyblue": [0,191,255,1], "dimgray": [105,105,105,1],
+  "dimgrey": [105,105,105,1], "dodgerblue": [30,144,255,1],
+  "firebrick": [178,34,34,1], "floralwhite": [255,250,240,1],
+  "forestgreen": [34,139,34,1], "fuchsia": [255,0,255,1],
+  "gainsboro": [220,220,220,1], "ghostwhite": [248,248,255,1],
+  "gold": [255,215,0,1], "goldenrod": [218,165,32,1],
+  "gray": [128,128,128,1], "green": [0,128,0,1],
+  "greenyellow": [173,255,47,1], "grey": [128,128,128,1],
+  "honeydew": [240,255,240,1], "hotpink": [255,105,180,1],
+  "indianred": [205,92,92,1], "indigo": [75,0,130,1],
+  "ivory": [255,255,240,1], "khaki": [240,230,140,1],
+  "lavender": [230,230,250,1], "lavenderblush": [255,240,245,1],
+  "lawngreen": [124,252,0,1], "lemonchiffon": [255,250,205,1],
+  "lightblue": [173,216,230,1], "lightcoral": [240,128,128,1],
+  "lightcyan": [224,255,255,1], "lightgoldenrodyellow": [250,250,210,1],
+  "lightgray": [211,211,211,1], "lightgreen": [144,238,144,1],
+  "lightgrey": [211,211,211,1], "lightpink": [255,182,193,1],
+  "lightsalmon": [255,160,122,1], "lightseagreen": [32,178,170,1],
+  "lightskyblue": [135,206,250,1], "lightslategray": [119,136,153,1],
+  "lightslategrey": [119,136,153,1], "lightsteelblue": [176,196,222,1],
+  "lightyellow": [255,255,224,1], "lime": [0,255,0,1],
+  "limegreen": [50,205,50,1], "linen": [250,240,230,1],
+  "magenta": [255,0,255,1], "maroon": [128,0,0,1],
+  "mediumaquamarine": [102,205,170,1], "mediumblue": [0,0,205,1],
+  "mediumorchid": [186,85,211,1], "mediumpurple": [147,112,219,1],
+  "mediumseagreen": [60,179,113,1], "mediumslateblue": [123,104,238,1],
+  "mediumspringgreen": [0,250,154,1], "mediumturquoise": [72,209,204,1],
+  "mediumvioletred": [199,21,133,1], "midnightblue": [25,25,112,1],
+  "mintcream": [245,255,250,1], "mistyrose": [255,228,225,1],
+  "moccasin": [255,228,181,1], "navajowhite": [255,222,173,1],
+  "navy": [0,0,128,1], "oldlace": [253,245,230,1],
+  "olive": [128,128,0,1], "olivedrab": [107,142,35,1],
+  "orange": [255,165,0,1], "orangered": [255,69,0,1],
+  "orchid": [218,112,214,1], "palegoldenrod": [238,232,170,1],
+  "palegreen": [152,251,152,1], "paleturquoise": [175,238,238,1],
+  "palevioletred": [219,112,147,1], "papayawhip": [255,239,213,1],
+  "peachpuff": [255,218,185,1], "peru": [205,133,63,1],
+  "pink": [255,192,203,1], "plum": [221,160,221,1],
+  "powderblue": [176,224,230,1], "purple": [128,0,128,1],
+  "rebeccapurple": [102,51,153,1],
+  "red": [255,0,0,1], "rosybrown": [188,143,143,1],
+  "royalblue": [65,105,225,1], "saddlebrown": [139,69,19,1],
+  "salmon": [250,128,114,1], "sandybrown": [244,164,96,1],
+  "seagreen": [46,139,87,1], "seashell": [255,245,238,1],
+  "sienna": [160,82,45,1], "silver": [192,192,192,1],
+  "skyblue": [135,206,235,1], "slateblue": [106,90,205,1],
+  "slategray": [112,128,144,1], "slategrey": [112,128,144,1],
+  "snow": [255,250,250,1], "springgreen": [0,255,127,1],
+  "steelblue": [70,130,180,1], "tan": [210,180,140,1],
+  "teal": [0,128,128,1], "thistle": [216,191,216,1],
+  "tomato": [255,99,71,1], "turquoise": [64,224,208,1],
+  "violet": [238,130,238,1], "wheat": [245,222,179,1],
+  "white": [255,255,255,1], "whitesmoke": [245,245,245,1],
+  "yellow": [255,255,0,1], "yellowgreen": [154,205,50,1]}
 
-  if (ctx.showHidden) {
-    keys = Object.getOwnPropertyNames(value);
-  }
+function clamp_css_byte(i) {  // Clamp to integer 0 .. 255.
+  i = Math.round(i);  // Seems to be what Chrome does (vs truncation).
+  return i < 0 ? 0 : i > 255 ? 255 : i;
+}
 
-  // IE doesn't make error fields non-enumerable
-  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
-  if (isError(value)
-      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
-    return formatError(value);
-  }
+function clamp_css_float(f) {  // Clamp to float 0.0 .. 1.0.
+  return f < 0 ? 0 : f > 1 ? 1 : f;
+}
 
-  // Some type of object without properties can be shortcutted.
-  if (keys.length === 0) {
-    if (isFunction(value)) {
-      var name = value.name ? ': ' + value.name : '';
-      return ctx.stylize('[Function' + name + ']', 'special');
-    }
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    }
-    if (isDate(value)) {
-      return ctx.stylize(Date.prototype.toString.call(value), 'date');
-    }
-    if (isError(value)) {
-      return formatError(value);
-    }
-  }
+function parse_css_int(str) {  // int or percentage.
+  if (str[str.length - 1] === '%')
+    return clamp_css_byte(parseFloat(str) / 100 * 255);
+  return clamp_css_byte(parseInt(str));
+}
 
-  var base = '', array = false, braces = ['{', '}'];
+function parse_css_float(str) {  // float or percentage.
+  if (str[str.length - 1] === '%')
+    return clamp_css_float(parseFloat(str) / 100);
+  return clamp_css_float(parseFloat(str));
+}
 
-  // Make Array say that they are Array
-  if (isArray(value)) {
-    array = true;
-    braces = ['[', ']'];
-  }
+function css_hue_to_rgb(m1, m2, h) {
+  if (h < 0) h += 1;
+  else if (h > 1) h -= 1;
 
-  // Make functions say that they are functions
-  if (isFunction(value)) {
-    var n = value.name ? ': ' + value.name : '';
-    base = ' [Function' + n + ']';
-  }
+  if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
+  if (h * 2 < 1) return m2;
+  if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
+  return m1;
+}
 
-  // Make RegExps say that they are RegExps
-  if (isRegExp(value)) {
-    base = ' ' + RegExp.prototype.toString.call(value);
-  }
+function parseCSSColor(css_str) {
+  // Remove all whitespace, not compliant, but should just be more accepting.
+  var str = css_str.replace(/ /g, '').toLowerCase();
 
-  // Make dates with properties first say the date
-  if (isDate(value)) {
-    base = ' ' + Date.prototype.toUTCString.call(value);
-  }
+  // Color keywords (and transparent) lookup.
+  if (str in kCSSColorTable) return kCSSColorTable[str].slice();  // dup.
 
-  // Make error with message first say the error
-  if (isError(value)) {
-    base = ' ' + formatError(value);
-  }
+  // #abc and #abc123 syntax.
+  if (str[0] === '#') {
+    if (str.length === 4) {
+      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.
+      if (!(iv >= 0 && iv <= 0xfff)) return null;  // Covers NaN.
+      return [((iv & 0xf00) >> 4) | ((iv & 0xf00) >> 8),
+              (iv & 0xf0) | ((iv & 0xf0) >> 4),
+              (iv & 0xf) | ((iv & 0xf) << 4),
+              1];
+    } else if (str.length === 7) {
+      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.
+      if (!(iv >= 0 && iv <= 0xffffff)) return null;  // Covers NaN.
+      return [(iv & 0xff0000) >> 16,
+              (iv & 0xff00) >> 8,
+              iv & 0xff,
+              1];
+    }
 
-  if (keys.length === 0 && (!array || value.length == 0)) {
-    return braces[0] + base + braces[1];
+    return null;
   }
 
-  if (recurseTimes < 0) {
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    } else {
-      return ctx.stylize('[Object]', 'special');
+  var op = str.indexOf('('), ep = str.indexOf(')');
+  if (op !== -1 && ep + 1 === str.length) {
+    var fname = str.substr(0, op);
+    var params = str.substr(op+1, ep-(op+1)).split(',');
+    var alpha = 1;  // To allow case fallthrough.
+    switch (fname) {
+      case 'rgba':
+        if (params.length !== 4) return null;
+        alpha = parse_css_float(params.pop());
+        // Fall through.
+      case 'rgb':
+        if (params.length !== 3) return null;
+        return [parse_css_int(params[0]),
+                parse_css_int(params[1]),
+                parse_css_int(params[2]),
+                alpha];
+      case 'hsla':
+        if (params.length !== 4) return null;
+        alpha = parse_css_float(params.pop());
+        // Fall through.
+      case 'hsl':
+        if (params.length !== 3) return null;
+        var h = (((parseFloat(params[0]) % 360) + 360) % 360) / 360;  // 0 .. 1
+        // NOTE(deanm): According to the CSS spec s/l should only be
+        // percentages, but we don't bother and let float or percentage.
+        var s = parse_css_float(params[1]);
+        var l = parse_css_float(params[2]);
+        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
+        var m1 = l * 2 - m2;
+        return [clamp_css_byte(css_hue_to_rgb(m1, m2, h+1/3) * 255),
+                clamp_css_byte(css_hue_to_rgb(m1, m2, h) * 255),
+                clamp_css_byte(css_hue_to_rgb(m1, m2, h-1/3) * 255),
+                alpha];
+      default:
+        return null;
     }
   }
 
-  ctx.seen.push(value);
+  return null;
+}
 
-  var output;
-  if (array) {
-    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-  } else {
-    output = keys.map(function(key) {
-      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-    });
-  }
+try { exports.parseCSSColor = parseCSSColor } catch(e) { }
 
-  ctx.seen.pop();
+},{}],72:[function(_dereq_,module,exports){
+'use strict';
 
-  return reduceToSingleString(output, base, braces);
-}
+module.exports = earcut;
 
+function earcut(data, holeIndices, dim) {
 
-function formatPrimitive(ctx, value) {
-  if (isUndefined(value))
-    return ctx.stylize('undefined', 'undefined');
-  if (isString(value)) {
-    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-                                             .replace(/'/g, "\\'")
-                                             .replace(/\\"/g, '"') + '\'';
-    return ctx.stylize(simple, 'string');
-  }
-  if (isNumber(value))
-    return ctx.stylize('' + value, 'number');
-  if (isBoolean(value))
-    return ctx.stylize('' + value, 'boolean');
-  // For some reason typeof null is "object", so special case here.
-  if (isNull(value))
-    return ctx.stylize('null', 'null');
-}
+    dim = dim || 2;
 
+    var hasHoles = holeIndices && holeIndices.length,
+        outerLen = hasHoles ? holeIndices[0] * dim : data.length,
+        outerNode = linkedList(data, 0, outerLen, dim, true),
+        triangles = [];
 
-function formatError(value) {
-  return '[' + Error.prototype.toString.call(value) + ']';
-}
+    if (!outerNode) return triangles;
 
+    var minX, minY, maxX, maxY, x, y, size;
 
-function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-  var output = [];
-  for (var i = 0, l = value.length; i < l; ++i) {
-    if (hasOwnProperty(value, String(i))) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          String(i), true));
-    } else {
-      output.push('');
-    }
-  }
-  keys.forEach(function(key) {
-    if (!key.match(/^\d+$/)) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          key, true));
-    }
-  });
-  return output;
-}
+    if (hasHoles) outerNode = eliminateHoles(data, holeIndices, outerNode, dim);
 
+    // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox
+    if (data.length > 80 * dim) {
+        minX = maxX = data[0];
+        minY = maxY = data[1];
 
-function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-  var name, str, desc;
-  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
-  if (desc.get) {
-    if (desc.set) {
-      str = ctx.stylize('[Getter/Setter]', 'special');
-    } else {
-      str = ctx.stylize('[Getter]', 'special');
-    }
-  } else {
-    if (desc.set) {
-      str = ctx.stylize('[Setter]', 'special');
-    }
-  }
-  if (!hasOwnProperty(visibleKeys, key)) {
-    name = '[' + key + ']';
-  }
-  if (!str) {
-    if (ctx.seen.indexOf(desc.value) < 0) {
-      if (isNull(recurseTimes)) {
-        str = formatValue(ctx, desc.value, null);
-      } else {
-        str = formatValue(ctx, desc.value, recurseTimes - 1);
-      }
-      if (str.indexOf('\n') > -1) {
-        if (array) {
-          str = str.split('\n').map(function(line) {
-            return '  ' + line;
-          }).join('\n').substr(2);
-        } else {
-          str = '\n' + str.split('\n').map(function(line) {
-            return '   ' + line;
-          }).join('\n');
+        for (var i = dim; i < outerLen; i += dim) {
+            x = data[i];
+            y = data[i + 1];
+            if (x < minX) minX = x;
+            if (y < minY) minY = y;
+            if (x > maxX) maxX = x;
+            if (y > maxY) maxY = y;
         }
-      }
-    } else {
-      str = ctx.stylize('[Circular]', 'special');
-    }
-  }
-  if (isUndefined(name)) {
-    if (array && key.match(/^\d+$/)) {
-      return str;
-    }
-    name = JSON.stringify('' + key);
-    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-      name = name.substr(1, name.length - 2);
-      name = ctx.stylize(name, 'name');
-    } else {
-      name = name.replace(/'/g, "\\'")
-                 .replace(/\\"/g, '"')
-                 .replace(/(^"|"$)/g, "'");
-      name = ctx.stylize(name, 'string');
+
+        // minX, minY and size are later used to transform coords into integers for z-order calculation
+        size = Math.max(maxX - minX, maxY - minY);
     }
-  }
 
-  return name + ': ' + str;
+    earcutLinked(outerNode, triangles, dim, minX, minY, size);
+
+    return triangles;
 }
 
+// create a circular doubly linked list from polygon points in the specified winding order
+function linkedList(data, start, end, dim, clockwise) {
+    var i, last;
 
-function reduceToSingleString(output, base, braces) {
-  var numLinesEst = 0;
-  var length = output.reduce(function(prev, cur) {
-    numLinesEst++;
-    if (cur.indexOf('\n') >= 0) numLinesEst++;
-    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
-  }, 0);
+    if (clockwise === (signedArea(data, start, end, dim) > 0)) {
+        for (i = start; i < end; i += dim) last = insertNode(i, data[i], data[i + 1], last);
+    } else {
+        for (i = end - dim; i >= start; i -= dim) last = insertNode(i, data[i], data[i + 1], last);
+    }
 
-  if (length > 60) {
-    return braces[0] +
-           (base === '' ? '' : base + '\n ') +
-           ' ' +
-           output.join(',\n  ') +
-           ' ' +
-           braces[1];
-  }
+    if (last && equals(last, last.next)) {
+        removeNode(last);
+        last = last.next;
+    }
 
-  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+    return last;
 }
 
+// eliminate colinear or duplicate points
+function filterPoints(start, end) {
+    if (!start) return start;
+    if (!end) end = start;
 
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
-function isArray(ar) {
-  return Array.isArray(ar);
-}
-exports.isArray = isArray;
-
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
-}
-exports.isBoolean = isBoolean;
+    var p = start,
+        again;
+    do {
+        again = false;
 
-function isNull(arg) {
-  return arg === null;
-}
-exports.isNull = isNull;
+        if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {
+            removeNode(p);
+            p = end = p.prev;
+            if (p === p.next) return null;
+            again = true;
 
-function isNullOrUndefined(arg) {
-  return arg == null;
-}
-exports.isNullOrUndefined = isNullOrUndefined;
+        } else {
+            p = p.next;
+        }
+    } while (again || p !== end);
 
-function isNumber(arg) {
-  return typeof arg === 'number';
+    return end;
 }
-exports.isNumber = isNumber;
 
-function isString(arg) {
-  return typeof arg === 'string';
-}
-exports.isString = isString;
+// main ear slicing loop which triangulates a polygon (given as a linked list)
+function earcutLinked(ear, triangles, dim, minX, minY, size, pass) {
+    if (!ear) return;
 
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
-}
-exports.isSymbol = isSymbol;
+    // interlink polygon nodes in z-order
+    if (!pass && size) indexCurve(ear, minX, minY, size);
 
-function isUndefined(arg) {
-  return arg === void 0;
-}
-exports.isUndefined = isUndefined;
+    var stop = ear,
+        prev, next;
 
-function isRegExp(re) {
-  return isObject(re) && objectToString(re) === '[object RegExp]';
-}
-exports.isRegExp = isRegExp;
+    // iterate through ears, slicing them one by one
+    while (ear.prev !== ear.next) {
+        prev = ear.prev;
+        next = ear.next;
 
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
-}
-exports.isObject = isObject;
+        if (size ? isEarHashed(ear, minX, minY, size) : isEar(ear)) {
+            // cut off the triangle
+            triangles.push(prev.i / dim);
+            triangles.push(ear.i / dim);
+            triangles.push(next.i / dim);
 
-function isDate(d) {
-  return isObject(d) && objectToString(d) === '[object Date]';
-}
-exports.isDate = isDate;
+            removeNode(ear);
 
-function isError(e) {
-  return isObject(e) &&
-      (objectToString(e) === '[object Error]' || e instanceof Error);
-}
-exports.isError = isError;
+            // skipping the next vertice leads to less sliver triangles
+            ear = next.next;
+            stop = next.next;
 
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-exports.isFunction = isFunction;
+            continue;
+        }
 
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
-}
-exports.isPrimitive = isPrimitive;
+        ear = next;
 
-exports.isBuffer = _dereq_('./support/isBuffer');
+        // if we looped through the whole remaining polygon and can't find any more ears
+        if (ear === stop) {
+            // try filtering points and slicing again
+            if (!pass) {
+                earcutLinked(filterPoints(ear), triangles, dim, minX, minY, size, 1);
 
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
-}
+            // if this didn't work, try curing all small self-intersections locally
+            } else if (pass === 1) {
+                ear = cureLocalIntersections(ear, triangles, dim);
+                earcutLinked(ear, triangles, dim, minX, minY, size, 2);
 
+            // as a last resort, try splitting the remaining polygon into two
+            } else if (pass === 2) {
+                splitEarcut(ear, triangles, dim, minX, minY, size);
+            }
 
-function pad(n) {
-  return n < 10 ? '0' + n.toString(10) : n.toString(10);
+            break;
+        }
+    }
 }
 
+// check whether a polygon node forms a valid ear with adjacent nodes
+function isEar(ear) {
+    var a = ear.prev,
+        b = ear,
+        c = ear.next;
 
-var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
-              'Oct', 'Nov', 'Dec'];
+    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear
 
-// 26 Feb 16:19:34
-function timestamp() {
-  var d = new Date();
-  var time = [pad(d.getHours()),
-              pad(d.getMinutes()),
-              pad(d.getSeconds())].join(':');
-  return [d.getDate(), months[d.getMonth()], time].join(' ');
+    // now make sure we don't have other points inside the potential ear
+    var p = ear.next.next;
+
+    while (p !== ear.prev) {
+        if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
+            area(p.prev, p, p.next) >= 0) return false;
+        p = p.next;
+    }
+
+    return true;
 }
 
+function isEarHashed(ear, minX, minY, size) {
+    var a = ear.prev,
+        b = ear,
+        c = ear.next;
 
-// log is just a thin wrapper to console.log that prepends a timestamp
-exports.log = function() {
-  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
-};
+    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear
 
+    // triangle bbox; min & max are calculated like this for speed
+    var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x),
+        minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y),
+        maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x),
+        maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y);
 
-/**
- * Inherit the prototype methods from one constructor into another.
- *
- * The Function.prototype.inherits from lang.js rewritten as a standalone
- * function (not on Function.prototype). NOTE: If this file is to be loaded
- * during bootstrapping this function needs to be rewritten using some native
- * functions as prototype setup using normal JavaScript does not work as
- * expected during bootstrapping (see mirror.js in r114903).
- *
- * @param {function} ctor Constructor function which needs to inherit the
- *     prototype.
- * @param {function} superCtor Constructor function to inherit prototype from.
- */
-exports.inherits = _dereq_('inherits');
+    // z-order range for the current triangle bbox;
+    var minZ = zOrder(minTX, minTY, minX, minY, size),
+        maxZ = zOrder(maxTX, maxTY, minX, minY, size);
 
-exports._extend = function(origin, add) {
-  // Don't do anything if add isn't an object
-  if (!add || !isObject(add)) return origin;
+    // first look for points inside the triangle in increasing z-order
+    var p = ear.nextZ;
 
-  var keys = Object.keys(add);
-  var i = keys.length;
-  while (i--) {
-    origin[keys[i]] = add[keys[i]];
-  }
-  return origin;
-};
+    while (p && p.z <= maxZ) {
+        if (p !== ear.prev && p !== ear.next &&
+            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
+            area(p.prev, p, p.next) >= 0) return false;
+        p = p.nextZ;
+    }
 
-function hasOwnProperty(obj, prop) {
-  return Object.prototype.hasOwnProperty.call(obj, prop);
+    // then look for points in decreasing z-order
+    p = ear.prevZ;
+
+    while (p && p.z >= minZ) {
+        if (p !== ear.prev && p !== ear.next &&
+            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
+            area(p.prev, p, p.next) >= 0) return false;
+        p = p.prevZ;
+    }
+
+    return true;
 }
 
-}).call(this,_dereq_('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+// go through all polygon nodes and cure small local self-intersections
+function cureLocalIntersections(start, triangles, dim) {
+    var p = start;
+    do {
+        var a = p.prev,
+            b = p.next.next;
 
-},{"./support/isBuffer":10,"_process":8,"inherits":9}],12:[function(_dereq_,module,exports){
-_dereq_('../modules/es6.object.to-string');
-_dereq_('../modules/es6.string.iterator');
-_dereq_('../modules/web.dom.iterable');
-_dereq_('../modules/es6.promise');
-module.exports = _dereq_('../modules/_core').Promise;
-},{"../modules/_core":20,"../modules/es6.object.to-string":72,"../modules/es6.promise":73,"../modules/es6.string.iterator":74,"../modules/web.dom.iterable":75}],13:[function(_dereq_,module,exports){
-module.exports = function(it){
-  if(typeof it != 'function')throw TypeError(it + ' is not a function!');
-  return it;
-};
-},{}],14:[function(_dereq_,module,exports){
-// 22.1.3.31 Array.prototype[@@unscopables]
-var UNSCOPABLES = _dereq_('./_wks')('unscopables')
-  , ArrayProto  = Array.prototype;
-if(ArrayProto[UNSCOPABLES] == undefined)_dereq_('./_hide')(ArrayProto, UNSCOPABLES, {});
-module.exports = function(key){
-  ArrayProto[UNSCOPABLES][key] = true;
-};
-},{"./_hide":31,"./_wks":69}],15:[function(_dereq_,module,exports){
-module.exports = function(it, Constructor, name, forbiddenField){
-  if(!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)){
-    throw TypeError(name + ': incorrect invocation!');
-  } return it;
-};
-},{}],16:[function(_dereq_,module,exports){
-var isObject = _dereq_('./_is-object');
-module.exports = function(it){
-  if(!isObject(it))throw TypeError(it + ' is not an object!');
-  return it;
-};
-},{"./_is-object":37}],17:[function(_dereq_,module,exports){
-// false -> Array#indexOf
-// true  -> Array#includes
-var toIObject = _dereq_('./_to-iobject')
-  , toLength  = _dereq_('./_to-length')
-  , toIndex   = _dereq_('./_to-index');
-module.exports = function(IS_INCLUDES){
-  return function($this, el, fromIndex){
-    var O      = toIObject($this)
-      , length = toLength(O.length)
-      , index  = toIndex(fromIndex, length)
-      , value;
-    // Array#includes uses SameValueZero equality algorithm
-    if(IS_INCLUDES && el != el)while(length > index){
-      value = O[index++];
-      if(value != value)return true;
-    // Array#toIndex ignores holes, Array#includes - not
-    } else for(;length > index; index++)if(IS_INCLUDES || index in O){
-      if(O[index] === el)return IS_INCLUDES || index || 0;
-    } return !IS_INCLUDES && -1;
-  };
-};
-},{"./_to-index":62,"./_to-iobject":64,"./_to-length":65}],18:[function(_dereq_,module,exports){
-// getting tag from 19.1.3.6 Object.prototype.toString()
-var cof = _dereq_('./_cof')
-  , TAG = _dereq_('./_wks')('toStringTag')
-  // ES3 wrong here
-  , ARG = cof(function(){ return arguments; }()) == 'Arguments';
+        if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {
 
-// fallback for IE11 Script Access Denied error
-var tryGet = function(it, key){
-  try {
-    return it[key];
-  } catch(e){ /* empty */ }
-};
+            triangles.push(a.i / dim);
+            triangles.push(p.i / dim);
+            triangles.push(b.i / dim);
 
-module.exports = function(it){
-  var O, T, B;
-  return it === undefined ? 'Undefined' : it === null ? 'Null'
-    // @@toStringTag case
-    : typeof (T = tryGet(O = Object(it), TAG)) == 'string' ? T
-    // builtinTag case
-    : ARG ? cof(O)
-    // ES3 arguments fallback
-    : (B = cof(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : B;
-};
-},{"./_cof":19,"./_wks":69}],19:[function(_dereq_,module,exports){
-var toString = {}.toString;
+            // remove two nodes involved
+            removeNode(p);
+            removeNode(p.next);
 
-module.exports = function(it){
-  return toString.call(it).slice(8, -1);
-};
-},{}],20:[function(_dereq_,module,exports){
-var core = module.exports = {version: '2.4.0'};
-if(typeof __e == 'number')__e = core; // eslint-disable-line no-undef
-},{}],21:[function(_dereq_,module,exports){
-// optional / simple context binding
-var aFunction = _dereq_('./_a-function');
-module.exports = function(fn, that, length){
-  aFunction(fn);
-  if(that === undefined)return fn;
-  switch(length){
-    case 1: return function(a){
-      return fn.call(that, a);
-    };
-    case 2: return function(a, b){
-      return fn.call(that, a, b);
-    };
-    case 3: return function(a, b, c){
-      return fn.call(that, a, b, c);
-    };
-  }
-  return function(/* ...args */){
-    return fn.apply(that, arguments);
-  };
-};
-},{"./_a-function":13}],22:[function(_dereq_,module,exports){
-// 7.2.1 RequireObjectCoercible(argument)
-module.exports = function(it){
-  if(it == undefined)throw TypeError("Can't call method on  " + it);
-  return it;
-};
-},{}],23:[function(_dereq_,module,exports){
-// Thank's IE8 for his funny defineProperty
-module.exports = !_dereq_('./_fails')(function(){
-  return Object.defineProperty({}, 'a', {get: function(){ return 7; }}).a != 7;
-});
-},{"./_fails":27}],24:[function(_dereq_,module,exports){
-var isObject = _dereq_('./_is-object')
-  , document = _dereq_('./_global').document
-  // in old IE typeof document.createElement is 'object'
-  , is = isObject(document) && isObject(document.createElement);
-module.exports = function(it){
-  return is ? document.createElement(it) : {};
-};
-},{"./_global":29,"./_is-object":37}],25:[function(_dereq_,module,exports){
-// IE 8- don't enum bug keys
-module.exports = (
-  'constructor,hasOwnProperty,isPrototypeOf,propertyIsEnumerable,toLocaleString,toString,valueOf'
-).split(',');
-},{}],26:[function(_dereq_,module,exports){
-var global    = _dereq_('./_global')
-  , core      = _dereq_('./_core')
-  , hide      = _dereq_('./_hide')
-  , redefine  = _dereq_('./_redefine')
-  , ctx       = _dereq_('./_ctx')
-  , PROTOTYPE = 'prototype';
+            p = start = b;
+        }
+        p = p.next;
+    } while (p !== start);
 
-var $export = function(type, name, source){
-  var IS_FORCED = type & $export.F
-    , IS_GLOBAL = type & $export.G
-    , IS_STATIC = type & $export.S
-    , IS_PROTO  = type & $export.P
-    , IS_BIND   = type & $export.B
-    , target    = IS_GLOBAL ? global : IS_STATIC ? global[name] || (global[name] = {}) : (global[name] || {})[PROTOTYPE]
-    , exports   = IS_GLOBAL ? core : core[name] || (core[name] = {})
-    , expProto  = exports[PROTOTYPE] || (exports[PROTOTYPE] = {})
-    , key, own, out, exp;
-  if(IS_GLOBAL)source = name;
-  for(key in source){
-    // contains in native
-    own = !IS_FORCED && target && target[key] !== undefined;
-    // export native or passed
-    out = (own ? target : source)[key];
-    // bind timers to global for call from export context
-    exp = IS_BIND && own ? ctx(out, global) : IS_PROTO && typeof out == 'function' ? ctx(Function.call, out) : out;
-    // extend global
-    if(target)redefine(target, key, out, type & $export.U);
-    // export
-    if(exports[key] != out)hide(exports, key, exp);
-    if(IS_PROTO && expProto[key] != out)expProto[key] = out;
-  }
-};
-global.core = core;
-// type bitmap
-$export.F = 1;   // forced
-$export.G = 2;   // global
-$export.S = 4;   // static
-$export.P = 8;   // proto
-$export.B = 16;  // bind
-$export.W = 32;  // wrap
-$export.U = 64;  // safe
-$export.R = 128; // real proto method for `library` 
-module.exports = $export;
-},{"./_core":20,"./_ctx":21,"./_global":29,"./_hide":31,"./_redefine":54}],27:[function(_dereq_,module,exports){
-module.exports = function(exec){
-  try {
-    return !!exec();
-  } catch(e){
-    return true;
-  }
-};
-},{}],28:[function(_dereq_,module,exports){
-var ctx         = _dereq_('./_ctx')
-  , call        = _dereq_('./_iter-call')
-  , isArrayIter = _dereq_('./_is-array-iter')
-  , anObject    = _dereq_('./_an-object')
-  , toLength    = _dereq_('./_to-length')
-  , getIterFn   = _dereq_('./core.get-iterator-method')
-  , BREAK       = {}
-  , RETURN      = {};
-var exports = module.exports = function(iterable, entries, fn, that, ITERATOR){
-  var iterFn = ITERATOR ? function(){ return iterable; } : getIterFn(iterable)
-    , f      = ctx(fn, that, entries ? 2 : 1)
-    , index  = 0
-    , length, step, iterator, result;
-  if(typeof iterFn != 'function')throw TypeError(iterable + ' is not iterable!');
-  // fast case for arrays with default iterator
-  if(isArrayIter(iterFn))for(length = toLength(iterable.length); length > index; index++){
-    result = entries ? f(anObject(step = iterable[index])[0], step[1]) : f(iterable[index]);
-    if(result === BREAK || result === RETURN)return result;
-  } else for(iterator = iterFn.call(iterable); !(step = iterator.next()).done; ){
-    result = call(iterator, f, step.value, entries);
-    if(result === BREAK || result === RETURN)return result;
-  }
-};
-exports.BREAK  = BREAK;
-exports.RETURN = RETURN;
-},{"./_an-object":16,"./_ctx":21,"./_is-array-iter":36,"./_iter-call":38,"./_to-length":65,"./core.get-iterator-method":70}],29:[function(_dereq_,module,exports){
-// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
-var global = module.exports = typeof window != 'undefined' && window.Math == Math
-  ? window : typeof self != 'undefined' && self.Math == Math ? self : Function('return this')();
-if(typeof __g == 'number')__g = global; // eslint-disable-line no-undef
-},{}],30:[function(_dereq_,module,exports){
-var hasOwnProperty = {}.hasOwnProperty;
-module.exports = function(it, key){
-  return hasOwnProperty.call(it, key);
-};
-},{}],31:[function(_dereq_,module,exports){
-var dP         = _dereq_('./_object-dp')
-  , createDesc = _dereq_('./_property-desc');
-module.exports = _dereq_('./_descriptors') ? function(object, key, value){
-  return dP.f(object, key, createDesc(1, value));
-} : function(object, key, value){
-  object[key] = value;
-  return object;
-};
-},{"./_descriptors":23,"./_object-dp":47,"./_property-desc":52}],32:[function(_dereq_,module,exports){
-module.exports = _dereq_('./_global').document && document.documentElement;
-},{"./_global":29}],33:[function(_dereq_,module,exports){
-module.exports = !_dereq_('./_descriptors') && !_dereq_('./_fails')(function(){
-  return Object.defineProperty(_dereq_('./_dom-create')('div'), 'a', {get: function(){ return 7; }}).a != 7;
-});
-},{"./_descriptors":23,"./_dom-create":24,"./_fails":27}],34:[function(_dereq_,module,exports){
-// fast apply, http://jsperf.lnkit.com/fast-apply/5
-module.exports = function(fn, args, that){
-  var un = that === undefined;
-  switch(args.length){
-    case 0: return un ? fn()
-                      : fn.call(that);
-    case 1: return un ? fn(args[0])
-                      : fn.call(that, args[0]);
-    case 2: return un ? fn(args[0], args[1])
-                      : fn.call(that, args[0], args[1]);
-    case 3: return un ? fn(args[0], args[1], args[2])
-                      : fn.call(that, args[0], args[1], args[2]);
-    case 4: return un ? fn(args[0], args[1], args[2], args[3])
-                      : fn.call(that, args[0], args[1], args[2], args[3]);
-  } return              fn.apply(that, args);
-};
-},{}],35:[function(_dereq_,module,exports){
-// fallback for non-array-like ES3 and non-enumerable old V8 strings
-var cof = _dereq_('./_cof');
-module.exports = Object('z').propertyIsEnumerable(0) ? Object : function(it){
-  return cof(it) == 'String' ? it.split('') : Object(it);
-};
-},{"./_cof":19}],36:[function(_dereq_,module,exports){
-// check on default Array iterator
-var Iterators  = _dereq_('./_iterators')
-  , ITERATOR   = _dereq_('./_wks')('iterator')
-  , ArrayProto = Array.prototype;
+    return p;
+}
 
-module.exports = function(it){
-  return it !== undefined && (Iterators.Array === it || ArrayProto[ITERATOR] === it);
-};
-},{"./_iterators":43,"./_wks":69}],37:[function(_dereq_,module,exports){
-module.exports = function(it){
-  return typeof it === 'object' ? it !== null : typeof it === 'function';
-};
-},{}],38:[function(_dereq_,module,exports){
-// call something on iterator step with safe closing on error
-var anObject = _dereq_('./_an-object');
-module.exports = function(iterator, fn, value, entries){
-  try {
-    return entries ? fn(anObject(value)[0], value[1]) : fn(value);
-  // 7.4.6 IteratorClose(iterator, completion)
-  } catch(e){
-    var ret = iterator['return'];
-    if(ret !== undefined)anObject(ret.call(iterator));
-    throw e;
-  }
-};
-},{"./_an-object":16}],39:[function(_dereq_,module,exports){
-'use strict';
-var create         = _dereq_('./_object-create')
-  , descriptor     = _dereq_('./_property-desc')
-  , setToStringTag = _dereq_('./_set-to-string-tag')
-  , IteratorPrototype = {};
+// try splitting polygon into two and triangulate them independently
+function splitEarcut(start, triangles, dim, minX, minY, size) {
+    // look for a valid diagonal that divides the polygon into two
+    var a = start;
+    do {
+        var b = a.next.next;
+        while (b !== a.prev) {
+            if (a.i !== b.i && isValidDiagonal(a, b)) {
+                // split the polygon in two by the diagonal
+                var c = splitPolygon(a, b);
 
-// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
-_dereq_('./_hide')(IteratorPrototype, _dereq_('./_wks')('iterator'), function(){ return this; });
+                // filter colinear points around the cuts
+                a = filterPoints(a, a.next);
+                c = filterPoints(c, c.next);
 
-module.exports = function(Constructor, NAME, next){
-  Constructor.prototype = create(IteratorPrototype, {next: descriptor(1, next)});
-  setToStringTag(Constructor, NAME + ' Iterator');
-};
-},{"./_hide":31,"./_object-create":46,"./_property-desc":52,"./_set-to-string-tag":56,"./_wks":69}],40:[function(_dereq_,module,exports){
-'use strict';
-var LIBRARY        = _dereq_('./_library')
-  , $export        = _dereq_('./_export')
-  , redefine       = _dereq_('./_redefine')
-  , hide           = _dereq_('./_hide')
-  , has            = _dereq_('./_has')
-  , Iterators      = _dereq_('./_iterators')
-  , $iterCreate    = _dereq_('./_iter-create')
-  , setToStringTag = _dereq_('./_set-to-string-tag')
-  , getPrototypeOf = _dereq_('./_object-gpo')
-  , ITERATOR       = _dereq_('./_wks')('iterator')
-  , BUGGY          = !([].keys && 'next' in [].keys()) // Safari has buggy iterators w/o `next`
-  , FF_ITERATOR    = '@@iterator'
-  , KEYS           = 'keys'
-  , VALUES         = 'values';
+                // run earcut on each half
+                earcutLinked(a, triangles, dim, minX, minY, size);
+                earcutLinked(c, triangles, dim, minX, minY, size);
+                return;
+            }
+            b = b.next;
+        }
+        a = a.next;
+    } while (a !== start);
+}
 
-var returnThis = function(){ return this; };
+// link every hole into the outer loop, producing a single-ring polygon without holes
+function eliminateHoles(data, holeIndices, outerNode, dim) {
+    var queue = [],
+        i, len, start, end, list;
 
-module.exports = function(Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCED){
-  $iterCreate(Constructor, NAME, next);
-  var getMethod = function(kind){
-    if(!BUGGY && kind in proto)return proto[kind];
-    switch(kind){
-      case KEYS: return function keys(){ return new Constructor(this, kind); };
-      case VALUES: return function values(){ return new Constructor(this, kind); };
-    } return function entries(){ return new Constructor(this, kind); };
-  };
-  var TAG        = NAME + ' Iterator'
-    , DEF_VALUES = DEFAULT == VALUES
-    , VALUES_BUG = false
-    , proto      = Base.prototype
-    , $native    = proto[ITERATOR] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT]
-    , $default   = $native || getMethod(DEFAULT)
-    , $entries   = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined
-    , $anyNative = NAME == 'Array' ? proto.entries || $native : $native
-    , methods, key, IteratorPrototype;
-  // Fix native
-  if($anyNative){
-    IteratorPrototype = getPrototypeOf($anyNative.call(new Base));
-    if(IteratorPrototype !== Object.prototype){
-      // Set @@toStringTag to native iterators
-      setToStringTag(IteratorPrototype, TAG, true);
-      // fix for some old engines
-      if(!LIBRARY && !has(IteratorPrototype, ITERATOR))hide(IteratorPrototype, ITERATOR, returnThis);
+    for (i = 0, len = holeIndices.length; i < len; i++) {
+        start = holeIndices[i] * dim;
+        end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
+        list = linkedList(data, start, end, dim, false);
+        if (list === list.next) list.steiner = true;
+        queue.push(getLeftmost(list));
     }
-  }
-  // fix Array#{values, @@iterator}.name in V8 / FF
-  if(DEF_VALUES && $native && $native.name !== VALUES){
-    VALUES_BUG = true;
-    $default = function values(){ return $native.call(this); };
-  }
-  // Define iterator
-  if((!LIBRARY || FORCED) && (BUGGY || VALUES_BUG || !proto[ITERATOR])){
-    hide(proto, ITERATOR, $default);
-  }
-  // Plug for library
-  Iterators[NAME] = $default;
-  Iterators[TAG]  = returnThis;
-  if(DEFAULT){
-    methods = {
-      values:  DEF_VALUES ? $default : getMethod(VALUES),
-      keys:    IS_SET     ? $default : getMethod(KEYS),
-      entries: $entries
-    };
-    if(FORCED)for(key in methods){
-      if(!(key in proto))redefine(proto, key, methods[key]);
-    } else $export($export.P + $export.F * (BUGGY || VALUES_BUG), NAME, methods);
-  }
-  return methods;
-};
-},{"./_export":26,"./_has":30,"./_hide":31,"./_iter-create":39,"./_iterators":43,"./_library":44,"./_object-gpo":49,"./_redefine":54,"./_set-to-string-tag":56,"./_wks":69}],41:[function(_dereq_,module,exports){
-var ITERATOR     = _dereq_('./_wks')('iterator')
-  , SAFE_CLOSING = false;
 
-try {
-  var riter = [7][ITERATOR]();
-  riter['return'] = function(){ SAFE_CLOSING = true; };
-  Array.from(riter, function(){ throw 2; });
-} catch(e){ /* empty */ }
+    queue.sort(compareX);
 
-module.exports = function(exec, skipClosing){
-  if(!skipClosing && !SAFE_CLOSING)return false;
-  var safe = false;
-  try {
-    var arr  = [7]
-      , iter = arr[ITERATOR]();
-    iter.next = function(){ return {done: safe = true}; };
-    arr[ITERATOR] = function(){ return iter; };
-    exec(arr);
-  } catch(e){ /* empty */ }
-  return safe;
-};
-},{"./_wks":69}],42:[function(_dereq_,module,exports){
-module.exports = function(done, value){
-  return {value: value, done: !!done};
-};
-},{}],43:[function(_dereq_,module,exports){
-module.exports = {};
-},{}],44:[function(_dereq_,module,exports){
-module.exports = false;
-},{}],45:[function(_dereq_,module,exports){
-var global    = _dereq_('./_global')
-  , macrotask = _dereq_('./_task').set
-  , Observer  = global.MutationObserver || global.WebKitMutationObserver
-  , process   = global.process
-  , Promise   = global.Promise
-  , isNode    = _dereq_('./_cof')(process) == 'process';
+    // process holes from left to right
+    for (i = 0; i < queue.length; i++) {
+        eliminateHole(queue[i], outerNode);
+        outerNode = filterPoints(outerNode, outerNode.next);
+    }
 
-module.exports = function(){
-  var head, last, notify;
+    return outerNode;
+}
 
-  var flush = function(){
-    var parent, fn;
-    if(isNode && (parent = process.domain))parent.exit();
-    while(head){
-      fn   = head.fn;
-      head = head.next;
-      try {
-        fn();
-      } catch(e){
-        if(head)notify();
-        else last = undefined;
-        throw e;
-      }
-    } last = undefined;
-    if(parent)parent.enter();
-  };
+function compareX(a, b) {
+    return a.x - b.x;
+}
 
-  // Node.js
-  if(isNode){
-    notify = function(){
-      process.nextTick(flush);
-    };
-  // browsers with MutationObserver
-  } else if(Observer){
-    var toggle = true
-      , node   = document.createTextNode('');
-    new Observer(flush).observe(node, {characterData: true}); // eslint-disable-line no-new
-    notify = function(){
-      node.data = toggle = !toggle;
-    };
-  // environments with maybe non-completely correct, but existent Promise
-  } else if(Promise && Promise.resolve){
-    var promise = Promise.resolve();
-    notify = function(){
-      promise.then(flush);
-    };
-  // for other environments - macrotask based on:
-  // - setImmediate
-  // - MessageChannel
-  // - window.postMessag
-  // - onreadystatechange
-  // - setTimeout
-  } else {
-    notify = function(){
-      // strange IE + webpack dev server bug - use .call(global)
-      macrotask.call(global, flush);
-    };
-  }
+// find a bridge between vertices that connects hole with an outer ring and and link it
+function eliminateHole(hole, outerNode) {
+    outerNode = findHoleBridge(hole, outerNode);
+    if (outerNode) {
+        var b = splitPolygon(outerNode, hole);
+        filterPoints(b, b.next);
+    }
+}
 
-  return function(fn){
-    var task = {fn: fn, next: undefined};
-    if(last)last.next = task;
-    if(!head){
-      head = task;
-      notify();
-    } last = task;
-  };
-};
-},{"./_cof":19,"./_global":29,"./_task":61}],46:[function(_dereq_,module,exports){
-// 19.1.2.2 / 15.2.3.5 Object.create(O [, Properties])
-var anObject    = _dereq_('./_an-object')
-  , dPs         = _dereq_('./_object-dps')
-  , enumBugKeys = _dereq_('./_enum-bug-keys')
-  , IE_PROTO    = _dereq_('./_shared-key')('IE_PROTO')
-  , Empty       = function(){ /* empty */ }
-  , PROTOTYPE   = 'prototype';
+// David Eberly's algorithm for finding a bridge between hole and outer polygon
+function findHoleBridge(hole, outerNode) {
+    var p = outerNode,
+        hx = hole.x,
+        hy = hole.y,
+        qx = -Infinity,
+        m;
 
-// Create object with fake `null` prototype: use iframe Object with cleared prototype
-var createDict = function(){
-  // Thrash, waste and sodomy: IE GC bug
-  var iframe = _dereq_('./_dom-create')('iframe')
-    , i      = enumBugKeys.length
-    , lt     = '<'
-    , gt     = '>'
-    , iframeDocument;
-  iframe.style.display = 'none';
-  _dereq_('./_html').appendChild(iframe);
-  iframe.src = 'javascript:'; // eslint-disable-line no-script-url
-  // createDict = iframe.contentWindow.Object;
-  // html.removeChild(iframe);
-  iframeDocument = iframe.contentWindow.document;
-  iframeDocument.open();
-  iframeDocument.write(lt + 'script' + gt + 'document.F=Object' + lt + '/script' + gt);
-  iframeDocument.close();
-  createDict = iframeDocument.F;
-  while(i--)delete createDict[PROTOTYPE][enumBugKeys[i]];
-  return createDict();
-};
+    // find a segment intersected by a ray from the hole's leftmost point to the left;
+    // segment's endpoint with lesser x will be potential connection point
+    do {
+        if (hy <= p.y && hy >= p.next.y) {
+            var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y);
+            if (x <= hx && x > qx) {
+                qx = x;
+                if (x === hx) {
+                    if (hy === p.y) return p;
+                    if (hy === p.next.y) return p.next;
+                }
+                m = p.x < p.next.x ? p : p.next;
+            }
+        }
+        p = p.next;
+    } while (p !== outerNode);
 
-module.exports = Object.create || function create(O, Properties){
-  var result;
-  if(O !== null){
-    Empty[PROTOTYPE] = anObject(O);
-    result = new Empty;
-    Empty[PROTOTYPE] = null;
-    // add "__proto__" for Object.getPrototypeOf polyfill
-    result[IE_PROTO] = O;
-  } else result = createDict();
-  return Properties === undefined ? result : dPs(result, Properties);
-};
+    if (!m) return null;
 
-},{"./_an-object":16,"./_dom-create":24,"./_enum-bug-keys":25,"./_html":32,"./_object-dps":48,"./_shared-key":57}],47:[function(_dereq_,module,exports){
-var anObject       = _dereq_('./_an-object')
-  , IE8_DOM_DEFINE = _dereq_('./_ie8-dom-define')
-  , toPrimitive    = _dereq_('./_to-primitive')
-  , dP             = Object.defineProperty;
+    if (hx === qx) return m.prev; // hole touches outer segment; pick lower endpoint
 
-exports.f = _dereq_('./_descriptors') ? Object.defineProperty : function defineProperty(O, P, Attributes){
-  anObject(O);
-  P = toPrimitive(P, true);
-  anObject(Attributes);
-  if(IE8_DOM_DEFINE)try {
-    return dP(O, P, Attributes);
-  } catch(e){ /* empty */ }
-  if('get' in Attributes || 'set' in Attributes)throw TypeError('Accessors not supported!');
-  if('value' in Attributes)O[P] = Attributes.value;
-  return O;
-};
-},{"./_an-object":16,"./_descriptors":23,"./_ie8-dom-define":33,"./_to-primitive":67}],48:[function(_dereq_,module,exports){
-var dP       = _dereq_('./_object-dp')
-  , anObject = _dereq_('./_an-object')
-  , getKeys  = _dereq_('./_object-keys');
+    // look for points inside the triangle of hole point, segment intersection and endpoint;
+    // if there are no points found, we have a valid connection;
+    // otherwise choose the point of the minimum angle with the ray as connection point
 
-module.exports = _dereq_('./_descriptors') ? Object.defineProperties : function defineProperties(O, Properties){
-  anObject(O);
-  var keys   = getKeys(Properties)
-    , length = keys.length
-    , i = 0
-    , P;
-  while(length > i)dP.f(O, P = keys[i++], Properties[P]);
-  return O;
-};
-},{"./_an-object":16,"./_descriptors":23,"./_object-dp":47,"./_object-keys":51}],49:[function(_dereq_,module,exports){
-// 19.1.2.9 / 15.2.3.2 Object.getPrototypeOf(O)
-var has         = _dereq_('./_has')
-  , toObject    = _dereq_('./_to-object')
-  , IE_PROTO    = _dereq_('./_shared-key')('IE_PROTO')
-  , ObjectProto = Object.prototype;
+    var stop = m,
+        mx = m.x,
+        my = m.y,
+        tanMin = Infinity,
+        tan;
 
-module.exports = Object.getPrototypeOf || function(O){
-  O = toObject(O);
-  if(has(O, IE_PROTO))return O[IE_PROTO];
-  if(typeof O.constructor == 'function' && O instanceof O.constructor){
-    return O.constructor.prototype;
-  } return O instanceof Object ? ObjectProto : null;
-};
-},{"./_has":30,"./_shared-key":57,"./_to-object":66}],50:[function(_dereq_,module,exports){
-var has          = _dereq_('./_has')
-  , toIObject    = _dereq_('./_to-iobject')
-  , arrayIndexOf = _dereq_('./_array-includes')(false)
-  , IE_PROTO     = _dereq_('./_shared-key')('IE_PROTO');
+    p = m.next;
 
-module.exports = function(object, names){
-  var O      = toIObject(object)
-    , i      = 0
-    , result = []
-    , key;
-  for(key in O)if(key != IE_PROTO)has(O, key) && result.push(key);
-  // Don't enum bug & hidden keys
-  while(names.length > i)if(has(O, key = names[i++])){
-    ~arrayIndexOf(result, key) || result.push(key);
-  }
-  return result;
-};
-},{"./_array-includes":17,"./_has":30,"./_shared-key":57,"./_to-iobject":64}],51:[function(_dereq_,module,exports){
-// 19.1.2.14 / 15.2.3.14 Object.keys(O)
-var $keys       = _dereq_('./_object-keys-internal')
-  , enumBugKeys = _dereq_('./_enum-bug-keys');
+    while (p !== stop) {
+        if (hx >= p.x && p.x >= mx &&
+                pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {
 
-module.exports = Object.keys || function keys(O){
-  return $keys(O, enumBugKeys);
-};
-},{"./_enum-bug-keys":25,"./_object-keys-internal":50}],52:[function(_dereq_,module,exports){
-module.exports = function(bitmap, value){
-  return {
-    enumerable  : !(bitmap & 1),
-    configurable: !(bitmap & 2),
-    writable    : !(bitmap & 4),
-    value       : value
-  };
-};
-},{}],53:[function(_dereq_,module,exports){
-var redefine = _dereq_('./_redefine');
-module.exports = function(target, src, safe){
-  for(var key in src)redefine(target, key, src[key], safe);
-  return target;
-};
-},{"./_redefine":54}],54:[function(_dereq_,module,exports){
-var global    = _dereq_('./_global')
-  , hide      = _dereq_('./_hide')
-  , has       = _dereq_('./_has')
-  , SRC       = _dereq_('./_uid')('src')
-  , TO_STRING = 'toString'
-  , $toString = Function[TO_STRING]
-  , TPL       = ('' + $toString).split(TO_STRING);
+            tan = Math.abs(hy - p.y) / (hx - p.x); // tangential
 
-_dereq_('./_core').inspectSource = function(it){
-  return $toString.call(it);
-};
+            if ((tan < tanMin || (tan === tanMin && p.x > m.x)) && locallyInside(p, hole)) {
+                m = p;
+                tanMin = tan;
+            }
+        }
 
-(module.exports = function(O, key, val, safe){
-  var isFunction = typeof val == 'function';
-  if(isFunction)has(val, 'name') || hide(val, 'name', key);
-  if(O[key] === val)return;
-  if(isFunction)has(val, SRC) || hide(val, SRC, O[key] ? '' + O[key] : TPL.join(String(key)));
-  if(O === global){
-    O[key] = val;
-  } else {
-    if(!safe){
-      delete O[key];
-      hide(O, key, val);
-    } else {
-      if(O[key])O[key] = val;
-      else hide(O, key, val);
+        p = p.next;
     }
-  }
-// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
-})(Function.prototype, TO_STRING, function toString(){
-  return typeof this == 'function' && this[SRC] || $toString.call(this);
-});
-},{"./_core":20,"./_global":29,"./_has":30,"./_hide":31,"./_uid":68}],55:[function(_dereq_,module,exports){
-'use strict';
-var global      = _dereq_('./_global')
-  , dP          = _dereq_('./_object-dp')
-  , DESCRIPTORS = _dereq_('./_descriptors')
-  , SPECIES     = _dereq_('./_wks')('species');
 
-module.exports = function(KEY){
-  var C = global[KEY];
-  if(DESCRIPTORS && C && !C[SPECIES])dP.f(C, SPECIES, {
-    configurable: true,
-    get: function(){ return this; }
-  });
-};
-},{"./_descriptors":23,"./_global":29,"./_object-dp":47,"./_wks":69}],56:[function(_dereq_,module,exports){
-var def = _dereq_('./_object-dp').f
-  , has = _dereq_('./_has')
-  , TAG = _dereq_('./_wks')('toStringTag');
+    return m;
+}
 
-module.exports = function(it, tag, stat){
-  if(it && !has(it = stat ? it : it.prototype, TAG))def(it, TAG, {configurable: true, value: tag});
-};
-},{"./_has":30,"./_object-dp":47,"./_wks":69}],57:[function(_dereq_,module,exports){
-var shared = _dereq_('./_shared')('keys')
-  , uid    = _dereq_('./_uid');
-module.exports = function(key){
-  return shared[key] || (shared[key] = uid(key));
-};
-},{"./_shared":58,"./_uid":68}],58:[function(_dereq_,module,exports){
-var global = _dereq_('./_global')
-  , SHARED = '__core-js_shared__'
-  , store  = global[SHARED] || (global[SHARED] = {});
-module.exports = function(key){
-  return store[key] || (store[key] = {});
-};
-},{"./_global":29}],59:[function(_dereq_,module,exports){
-// 7.3.20 SpeciesConstructor(O, defaultConstructor)
-var anObject  = _dereq_('./_an-object')
-  , aFunction = _dereq_('./_a-function')
-  , SPECIES   = _dereq_('./_wks')('species');
-module.exports = function(O, D){
-  var C = anObject(O).constructor, S;
-  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? D : aFunction(S);
-};
-},{"./_a-function":13,"./_an-object":16,"./_wks":69}],60:[function(_dereq_,module,exports){
-var toInteger = _dereq_('./_to-integer')
-  , defined   = _dereq_('./_defined');
-// true  -> String#at
-// false -> String#codePointAt
-module.exports = function(TO_STRING){
-  return function(that, pos){
-    var s = String(defined(that))
-      , i = toInteger(pos)
-      , l = s.length
-      , a, b;
-    if(i < 0 || i >= l)return TO_STRING ? '' : undefined;
-    a = s.charCodeAt(i);
-    return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff
-      ? TO_STRING ? s.charAt(i) : a
-      : TO_STRING ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000;
-  };
-};
-},{"./_defined":22,"./_to-integer":63}],61:[function(_dereq_,module,exports){
-var ctx                = _dereq_('./_ctx')
-  , invoke             = _dereq_('./_invoke')
-  , html               = _dereq_('./_html')
-  , cel                = _dereq_('./_dom-create')
-  , global             = _dereq_('./_global')
-  , process            = global.process
-  , setTask            = global.setImmediate
-  , clearTask          = global.clearImmediate
-  , MessageChannel     = global.MessageChannel
-  , counter            = 0
-  , queue              = {}
-  , ONREADYSTATECHANGE = 'onreadystatechange'
-  , defer, channel, port;
-var run = function(){
-  var id = +this;
-  if(queue.hasOwnProperty(id)){
-    var fn = queue[id];
-    delete queue[id];
-    fn();
-  }
-};
-var listener = function(event){
-  run.call(event.data);
-};
-// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
-if(!setTask || !clearTask){
-  setTask = function setImmediate(fn){
-    var args = [], i = 1;
-    while(arguments.length > i)args.push(arguments[i++]);
-    queue[++counter] = function(){
-      invoke(typeof fn == 'function' ? fn : Function(fn), args);
-    };
-    defer(counter);
-    return counter;
-  };
-  clearTask = function clearImmediate(id){
-    delete queue[id];
-  };
-  // Node.js 0.8-
-  if(_dereq_('./_cof')(process) == 'process'){
-    defer = function(id){
-      process.nextTick(ctx(run, id, 1));
-    };
-  // Browsers with MessageChannel, includes WebWorkers
-  } else if(MessageChannel){
-    channel = new MessageChannel;
-    port    = channel.port2;
-    channel.port1.onmessage = listener;
-    defer = ctx(port.postMessage, port, 1);
-  // Browsers with postMessage, skip WebWorkers
-  // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
-  } else if(global.addEventListener && typeof postMessage == 'function' && !global.importScripts){
-    defer = function(id){
-      global.postMessage(id + '', '*');
-    };
-    global.addEventListener('message', listener, false);
-  // IE8-
-  } else if(ONREADYSTATECHANGE in cel('script')){
-    defer = function(id){
-      html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function(){
-        html.removeChild(this);
-        run.call(id);
-      };
-    };
-  // Rest old browsers
-  } else {
-    defer = function(id){
-      setTimeout(ctx(run, id, 1), 0);
-    };
-  }
+// interlink polygon nodes in z-order
+function indexCurve(start, minX, minY, size) {
+    var p = start;
+    do {
+        if (p.z === null) p.z = zOrder(p.x, p.y, minX, minY, size);
+        p.prevZ = p.prev;
+        p.nextZ = p.next;
+        p = p.next;
+    } while (p !== start);
+
+    p.prevZ.nextZ = null;
+    p.prevZ = null;
+
+    sortLinked(p);
 }
-module.exports = {
-  set:   setTask,
-  clear: clearTask
-};
-},{"./_cof":19,"./_ctx":21,"./_dom-create":24,"./_global":29,"./_html":32,"./_invoke":34}],62:[function(_dereq_,module,exports){
-var toInteger = _dereq_('./_to-integer')
-  , max       = Math.max
-  , min       = Math.min;
-module.exports = function(index, length){
-  index = toInteger(index);
-  return index < 0 ? max(index + length, 0) : min(index, length);
-};
-},{"./_to-integer":63}],63:[function(_dereq_,module,exports){
-// 7.1.4 ToInteger
-var ceil  = Math.ceil
-  , floor = Math.floor;
-module.exports = function(it){
-  return isNaN(it = +it) ? 0 : (it > 0 ? floor : ceil)(it);
-};
-},{}],64:[function(_dereq_,module,exports){
-// to indexed object, toObject with fallback for non-array-like ES3 strings
-var IObject = _dereq_('./_iobject')
-  , defined = _dereq_('./_defined');
-module.exports = function(it){
-  return IObject(defined(it));
-};
-},{"./_defined":22,"./_iobject":35}],65:[function(_dereq_,module,exports){
-// 7.1.15 ToLength
-var toInteger = _dereq_('./_to-integer')
-  , min       = Math.min;
-module.exports = function(it){
-  return it > 0 ? min(toInteger(it), 0x1fffffffffffff) : 0; // pow(2, 53) - 1 == 9007199254740991
-};
-},{"./_to-integer":63}],66:[function(_dereq_,module,exports){
-// 7.1.13 ToObject(argument)
-var defined = _dereq_('./_defined');
-module.exports = function(it){
-  return Object(defined(it));
-};
-},{"./_defined":22}],67:[function(_dereq_,module,exports){
-// 7.1.1 ToPrimitive(input [, PreferredType])
-var isObject = _dereq_('./_is-object');
-// instead of the ES6 spec version, we didn't implement @@toPrimitive case
-// and the second argument - flag - preferred type is a string
-module.exports = function(it, S){
-  if(!isObject(it))return it;
-  var fn, val;
-  if(S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it)))return val;
-  if(typeof (fn = it.valueOf) == 'function' && !isObject(val = fn.call(it)))return val;
-  if(!S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it)))return val;
-  throw TypeError("Can't convert object to primitive value");
-};
-},{"./_is-object":37}],68:[function(_dereq_,module,exports){
-var id = 0
-  , px = Math.random();
-module.exports = function(key){
-  return 'Symbol('.concat(key === undefined ? '' : key, ')_', (++id + px).toString(36));
-};
-},{}],69:[function(_dereq_,module,exports){
-var store      = _dereq_('./_shared')('wks')
-  , uid        = _dereq_('./_uid')
-  , Symbol     = _dereq_('./_global').Symbol
-  , USE_SYMBOL = typeof Symbol == 'function';
 
-var $exports = module.exports = function(name){
-  return store[name] || (store[name] =
-    USE_SYMBOL && Symbol[name] || (USE_SYMBOL ? Symbol : uid)('Symbol.' + name));
-};
+// Simon Tatham's linked list merge sort algorithm
+// http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
+function sortLinked(list) {
+    var i, p, q, e, tail, numMerges, pSize, qSize,
+        inSize = 1;
 
-$exports.store = store;
-},{"./_global":29,"./_shared":58,"./_uid":68}],70:[function(_dereq_,module,exports){
-var classof   = _dereq_('./_classof')
-  , ITERATOR  = _dereq_('./_wks')('iterator')
-  , Iterators = _dereq_('./_iterators');
-module.exports = _dereq_('./_core').getIteratorMethod = function(it){
-  if(it != undefined)return it[ITERATOR]
-    || it['@@iterator']
-    || Iterators[classof(it)];
-};
-},{"./_classof":18,"./_core":20,"./_iterators":43,"./_wks":69}],71:[function(_dereq_,module,exports){
-'use strict';
-var addToUnscopables = _dereq_('./_add-to-unscopables')
-  , step             = _dereq_('./_iter-step')
-  , Iterators        = _dereq_('./_iterators')
-  , toIObject        = _dereq_('./_to-iobject');
+    do {
+        p = list;
+        list = null;
+        tail = null;
+        numMerges = 0;
 
-// 22.1.3.4 Array.prototype.entries()
-// 22.1.3.13 Array.prototype.keys()
-// 22.1.3.29 Array.prototype.values()
-// 22.1.3.30 Array.prototype[@@iterator]()
-module.exports = _dereq_('./_iter-define')(Array, 'Array', function(iterated, kind){
-  this._t = toIObject(iterated); // target
-  this._i = 0;                   // next index
-  this._k = kind;                // kind
-// 22.1.5.2.1 %ArrayIteratorPrototype%.next()
-}, function(){
-  var O     = this._t
-    , kind  = this._k
-    , index = this._i++;
-  if(!O || index >= O.length){
-    this._t = undefined;
-    return step(1);
-  }
-  if(kind == 'keys'  )return step(0, index);
-  if(kind == 'values')return step(0, O[index]);
-  return step(0, [index, O[index]]);
-}, 'values');
+        while (p) {
+            numMerges++;
+            q = p;
+            pSize = 0;
+            for (i = 0; i < inSize; i++) {
+                pSize++;
+                q = q.nextZ;
+                if (!q) break;
+            }
 
-// argumentsList[@@iterator] is %ArrayProto_values% (9.4.4.6, 9.4.4.7)
-Iterators.Arguments = Iterators.Array;
+            qSize = inSize;
 
-addToUnscopables('keys');
-addToUnscopables('values');
-addToUnscopables('entries');
-},{"./_add-to-unscopables":14,"./_iter-define":40,"./_iter-step":42,"./_iterators":43,"./_to-iobject":64}],72:[function(_dereq_,module,exports){
-'use strict';
-// 19.1.3.6 Object.prototype.toString()
-var classof = _dereq_('./_classof')
-  , test    = {};
-test[_dereq_('./_wks')('toStringTag')] = 'z';
-if(test + '' != '[object z]'){
-  _dereq_('./_redefine')(Object.prototype, 'toString', function toString(){
-    return '[object ' + classof(this) + ']';
-  }, true);
-}
-},{"./_classof":18,"./_redefine":54,"./_wks":69}],73:[function(_dereq_,module,exports){
-'use strict';
-var LIBRARY            = _dereq_('./_library')
-  , global             = _dereq_('./_global')
-  , ctx                = _dereq_('./_ctx')
-  , classof            = _dereq_('./_classof')
-  , $export            = _dereq_('./_export')
-  , isObject           = _dereq_('./_is-object')
-  , aFunction          = _dereq_('./_a-function')
-  , anInstance         = _dereq_('./_an-instance')
-  , forOf              = _dereq_('./_for-of')
-  , speciesConstructor = _dereq_('./_species-constructor')
-  , task               = _dereq_('./_task').set
-  , microtask          = _dereq_('./_microtask')()
-  , PROMISE            = 'Promise'
-  , TypeError          = global.TypeError
-  , process            = global.process
-  , $Promise           = global[PROMISE]
-  , process            = global.process
-  , isNode             = classof(process) == 'process'
-  , empty              = function(){ /* empty */ }
-  , Internal, GenericPromiseCapability, Wrapper;
+            while (pSize > 0 || (qSize > 0 && q)) {
 
-var USE_NATIVE = !!function(){
-  try {
-    // correct subclassing with @@species support
-    var promise     = $Promise.resolve(1)
-      , FakePromise = (promise.constructor = {})[_dereq_('./_wks')('species')] = function(exec){ exec(empty, empty); };
-    // unhandled rejections tracking support, NodeJS Promise without it fails @@species test
-    return (isNode || typeof PromiseRejectionEvent == 'function') && promise.then(empty) instanceof FakePromise;
-  } catch(e){ /* empty */ }
-}();
+                if (pSize === 0) {
+                    e = q;
+                    q = q.nextZ;
+                    qSize--;
+                } else if (qSize === 0 || !q) {
+                    e = p;
+                    p = p.nextZ;
+                    pSize--;
+                } else if (p.z <= q.z) {
+                    e = p;
+                    p = p.nextZ;
+                    pSize--;
+                } else {
+                    e = q;
+                    q = q.nextZ;
+                    qSize--;
+                }
 
-// helpers
-var sameConstructor = function(a, b){
-  // with library wrapper special case
-  return a === b || a === $Promise && b === Wrapper;
-};
-var isThenable = function(it){
-  var then;
-  return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
-};
-var newPromiseCapability = function(C){
-  return sameConstructor($Promise, C)
-    ? new PromiseCapability(C)
-    : new GenericPromiseCapability(C);
-};
-var PromiseCapability = GenericPromiseCapability = function(C){
-  var resolve, reject;
-  this.promise = new C(function($$resolve, $$reject){
-    if(resolve !== undefined || reject !== undefined)throw TypeError('Bad Promise constructor');
-    resolve = $$resolve;
-    reject  = $$reject;
-  });
-  this.resolve = aFunction(resolve);
-  this.reject  = aFunction(reject);
-};
-var perform = function(exec){
-  try {
-    exec();
-  } catch(e){
-    return {error: e};
-  }
-};
-var notify = function(promise, isReject){
-  if(promise._n)return;
-  promise._n = true;
-  var chain = promise._c;
-  microtask(function(){
-    var value = promise._v
-      , ok    = promise._s == 1
-      , i     = 0;
-    var run = function(reaction){
-      var handler = ok ? reaction.ok : reaction.fail
-        , resolve = reaction.resolve
-        , reject  = reaction.reject
-        , domain  = reaction.domain
-        , result, then;
-      try {
-        if(handler){
-          if(!ok){
-            if(promise._h == 2)onHandleUnhandled(promise);
-            promise._h = 1;
-          }
-          if(handler === true)result = value;
-          else {
-            if(domain)domain.enter();
-            result = handler(value);
-            if(domain)domain.exit();
-          }
-          if(result === reaction.promise){
-            reject(TypeError('Promise-chain cycle'));
-          } else if(then = isThenable(result)){
-            then.call(result, resolve, reject);
-          } else resolve(result);
-        } else reject(value);
-      } catch(e){
-        reject(e);
-      }
-    };
-    while(chain.length > i)run(chain[i++]); // variable length - can't use forEach
-    promise._c = [];
-    promise._n = false;
-    if(isReject && !promise._h)onUnhandled(promise);
-  });
-};
-var onUnhandled = function(promise){
-  task.call(global, function(){
-    var value = promise._v
-      , abrupt, handler, console;
-    if(isUnhandled(promise)){
-      abrupt = perform(function(){
-        if(isNode){
-          process.emit('unhandledRejection', value, promise);
-        } else if(handler = global.onunhandledrejection){
-          handler({promise: promise, reason: value});
-        } else if((console = global.console) && console.error){
-          console.error('Unhandled promise rejection', value);
-        }
-      });
-      // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
-      promise._h = isNode || isUnhandled(promise) ? 2 : 1;
-    } promise._a = undefined;
-    if(abrupt)throw abrupt.error;
-  });
-};
-var isUnhandled = function(promise){
-  if(promise._h == 1)return false;
-  var chain = promise._a || promise._c
-    , i     = 0
-    , reaction;
-  while(chain.length > i){
-    reaction = chain[i++];
-    if(reaction.fail || !isUnhandled(reaction.promise))return false;
-  } return true;
-};
-var onHandleUnhandled = function(promise){
-  task.call(global, function(){
-    var handler;
-    if(isNode){
-      process.emit('rejectionHandled', promise);
-    } else if(handler = global.onrejectionhandled){
-      handler({promise: promise, reason: promise._v});
-    }
-  });
-};
-var $reject = function(value){
-  var promise = this;
-  if(promise._d)return;
-  promise._d = true;
-  promise = promise._w || promise; // unwrap
-  promise._v = value;
-  promise._s = 2;
-  if(!promise._a)promise._a = promise._c.slice();
-  notify(promise, true);
-};
-var $resolve = function(value){
-  var promise = this
-    , then;
-  if(promise._d)return;
-  promise._d = true;
-  promise = promise._w || promise; // unwrap
-  try {
-    if(promise === value)throw TypeError("Promise can't be resolved itself");
-    if(then = isThenable(value)){
-      microtask(function(){
-        var wrapper = {_w: promise, _d: false}; // wrap
-        try {
-          then.call(value, ctx($resolve, wrapper, 1), ctx($reject, wrapper, 1));
-        } catch(e){
-          $reject.call(wrapper, e);
+                if (tail) tail.nextZ = e;
+                else list = e;
+
+                e.prevZ = tail;
+                tail = e;
+            }
+
+            p = q;
         }
-      });
-    } else {
-      promise._v = value;
-      promise._s = 1;
-      notify(promise, false);
-    }
-  } catch(e){
-    $reject.call({_w: promise, _d: false}, e); // wrap
-  }
-};
 
-// constructor polyfill
-if(!USE_NATIVE){
-  // 25.4.3.1 Promise(executor)
-  $Promise = function Promise(executor){
-    anInstance(this, $Promise, PROMISE, '_h');
-    aFunction(executor);
-    Internal.call(this);
-    try {
-      executor(ctx($resolve, this, 1), ctx($reject, this, 1));
-    } catch(err){
-      $reject.call(this, err);
-    }
-  };
-  Internal = function Promise(executor){
-    this._c = [];             // <- awaiting reactions
-    this._a = undefined;      // <- checked in isUnhandled reactions
-    this._s = 0;              // <- state
-    this._d = false;          // <- done
-    this._v = undefined;      // <- value
-    this._h = 0;              // <- rejection state, 0 - default, 1 - handled, 2 - unhandled
-    this._n = false;          // <- notify
-  };
-  Internal.prototype = _dereq_('./_redefine-all')($Promise.prototype, {
-    // 25.4.5.3 Promise.prototype.then(onFulfilled, onRejected)
-    then: function then(onFulfilled, onRejected){
-      var reaction    = newPromiseCapability(speciesConstructor(this, $Promise));
-      reaction.ok     = typeof onFulfilled == 'function' ? onFulfilled : true;
-      reaction.fail   = typeof onRejected == 'function' && onRejected;
-      reaction.domain = isNode ? process.domain : undefined;
-      this._c.push(reaction);
-      if(this._a)this._a.push(reaction);
-      if(this._s)notify(this, false);
-      return reaction.promise;
-    },
-    // 25.4.5.1 Promise.prototype.catch(onRejected)
-    'catch': function(onRejected){
-      return this.then(undefined, onRejected);
-    }
-  });
-  PromiseCapability = function(){
-    var promise  = new Internal;
-    this.promise = promise;
-    this.resolve = ctx($resolve, promise, 1);
-    this.reject  = ctx($reject, promise, 1);
-  };
+        tail.nextZ = null;
+        inSize *= 2;
+
+    } while (numMerges > 1);
+
+    return list;
 }
 
-$export($export.G + $export.W + $export.F * !USE_NATIVE, {Promise: $Promise});
-_dereq_('./_set-to-string-tag')($Promise, PROMISE);
-_dereq_('./_set-species')(PROMISE);
-Wrapper = _dereq_('./_core')[PROMISE];
+// z-order of a point given coords and size of the data bounding box
+function zOrder(x, y, minX, minY, size) {
+    // coords are transformed into non-negative 15-bit integer range
+    x = 32767 * (x - minX) / size;
+    y = 32767 * (y - minY) / size;
 
-// statics
-$export($export.S + $export.F * !USE_NATIVE, PROMISE, {
-  // 25.4.4.5 Promise.reject(r)
-  reject: function reject(r){
-    var capability = newPromiseCapability(this)
-      , $$reject   = capability.reject;
-    $$reject(r);
-    return capability.promise;
-  }
-});
-$export($export.S + $export.F * (LIBRARY || !USE_NATIVE), PROMISE, {
-  // 25.4.4.6 Promise.resolve(x)
-  resolve: function resolve(x){
-    // instanceof instead of internal slot check because we should fix it without replacement native Promise core
-    if(x instanceof $Promise && sameConstructor(x.constructor, this))return x;
-    var capability = newPromiseCapability(this)
-      , $$resolve  = capability.resolve;
-    $$resolve(x);
-    return capability.promise;
-  }
-});
-$export($export.S + $export.F * !(USE_NATIVE && _dereq_('./_iter-detect')(function(iter){
-  $Promise.all(iter)['catch'](empty);
-})), PROMISE, {
-  // 25.4.4.1 Promise.all(iterable)
-  all: function all(iterable){
-    var C          = this
-      , capability = newPromiseCapability(C)
-      , resolve    = capability.resolve
-      , reject     = capability.reject;
-    var abrupt = perform(function(){
-      var values    = []
-        , index     = 0
-        , remaining = 1;
-      forOf(iterable, false, function(promise){
-        var $index        = index++
-          , alreadyCalled = false;
-        values.push(undefined);
-        remaining++;
-        C.resolve(promise).then(function(value){
-          if(alreadyCalled)return;
-          alreadyCalled  = true;
-          values[$index] = value;
-          --remaining || resolve(values);
-        }, reject);
-      });
-      --remaining || resolve(values);
-    });
-    if(abrupt)reject(abrupt.error);
-    return capability.promise;
-  },
-  // 25.4.4.4 Promise.race(iterable)
-  race: function race(iterable){
-    var C          = this
-      , capability = newPromiseCapability(C)
-      , reject     = capability.reject;
-    var abrupt = perform(function(){
-      forOf(iterable, false, function(promise){
-        C.resolve(promise).then(capability.resolve, reject);
-      });
-    });
-    if(abrupt)reject(abrupt.error);
-    return capability.promise;
-  }
-});
-},{"./_a-function":13,"./_an-instance":15,"./_classof":18,"./_core":20,"./_ctx":21,"./_export":26,"./_for-of":28,"./_global":29,"./_is-object":37,"./_iter-detect":41,"./_library":44,"./_microtask":45,"./_redefine-all":53,"./_set-species":55,"./_set-to-string-tag":56,"./_species-constructor":59,"./_task":61,"./_wks":69}],74:[function(_dereq_,module,exports){
-'use strict';
-var $at  = _dereq_('./_string-at')(true);
+    x = (x | (x << 8)) & 0x00FF00FF;
+    x = (x | (x << 4)) & 0x0F0F0F0F;
+    x = (x | (x << 2)) & 0x33333333;
+    x = (x | (x << 1)) & 0x55555555;
 
-// 21.1.3.27 String.prototype[@@iterator]()
-_dereq_('./_iter-define')(String, 'String', function(iterated){
-  this._t = String(iterated); // target
-  this._i = 0;                // next index
-// 21.1.5.2.1 %StringIteratorPrototype%.next()
-}, function(){
-  var O     = this._t
-    , index = this._i
-    , point;
-  if(index >= O.length)return {value: undefined, done: true};
-  point = $at(O, index);
-  this._i += point.length;
-  return {value: point, done: false};
-});
-},{"./_iter-define":40,"./_string-at":60}],75:[function(_dereq_,module,exports){
-var $iterators    = _dereq_('./es6.array.iterator')
-  , redefine      = _dereq_('./_redefine')
-  , global        = _dereq_('./_global')
-  , hide          = _dereq_('./_hide')
-  , Iterators     = _dereq_('./_iterators')
-  , wks           = _dereq_('./_wks')
-  , ITERATOR      = wks('iterator')
-  , TO_STRING_TAG = wks('toStringTag')
-  , ArrayValues   = Iterators.Array;
+    y = (y | (y << 8)) & 0x00FF00FF;
+    y = (y | (y << 4)) & 0x0F0F0F0F;
+    y = (y | (y << 2)) & 0x33333333;
+    y = (y | (y << 1)) & 0x55555555;
 
-for(var collections = ['NodeList', 'DOMTokenList', 'MediaList', 'StyleSheetList', 'CSSRuleList'], i = 0; i < 5; i++){
-  var NAME       = collections[i]
-    , Collection = global[NAME]
-    , proto      = Collection && Collection.prototype
-    , key;
-  if(proto){
-    if(!proto[ITERATOR])hide(proto, ITERATOR, ArrayValues);
-    if(!proto[TO_STRING_TAG])hide(proto, TO_STRING_TAG, NAME);
-    Iterators[NAME] = ArrayValues;
-    for(key in $iterators)if(!proto[key])redefine(proto, key, $iterators[key], true);
-  }
+    return x | (y << 1);
 }
-},{"./_global":29,"./_hide":31,"./_iterators":43,"./_redefine":54,"./_wks":69,"./es6.array.iterator":71}],76:[function(_dereq_,module,exports){
-// (c) Dean McNamee <dean@gmail.com>, 2012.
-//
-// https://github.com/deanm/css-color-parser-js
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to
-// deal in the Software without restriction, including without limitation the
-// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-// sell copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-// IN THE SOFTWARE.
 
-// http://www.w3.org/TR/css3-color/
-var kCSSColorTable = {
-  "transparent": [0,0,0,0], "aliceblue": [240,248,255,1],
-  "antiquewhite": [250,235,215,1], "aqua": [0,255,255,1],
-  "aquamarine": [127,255,212,1], "azure": [240,255,255,1],
-  "beige": [245,245,220,1], "bisque": [255,228,196,1],
-  "black": [0,0,0,1], "blanchedalmond": [255,235,205,1],
-  "blue": [0,0,255,1], "blueviolet": [138,43,226,1],
-  "brown": [165,42,42,1], "burlywood": [222,184,135,1],
-  "cadetblue": [95,158,160,1], "chartreuse": [127,255,0,1],
-  "chocolate": [210,105,30,1], "coral": [255,127,80,1],
-  "cornflowerblue": [100,149,237,1], "cornsilk": [255,248,220,1],
-  "crimson": [220,20,60,1], "cyan": [0,255,255,1],
-  "darkblue": [0,0,139,1], "darkcyan": [0,139,139,1],
-  "darkgoldenrod": [184,134,11,1], "darkgray": [169,169,169,1],
-  "darkgreen": [0,100,0,1], "darkgrey": [169,169,169,1],
-  "darkkhaki": [189,183,107,1], "darkmagenta": [139,0,139,1],
-  "darkolivegreen": [85,107,47,1], "darkorange": [255,140,0,1],
-  "darkorchid": [153,50,204,1], "darkred": [139,0,0,1],
-  "darksalmon": [233,150,122,1], "darkseagreen": [143,188,143,1],
-  "darkslateblue": [72,61,139,1], "darkslategray": [47,79,79,1],
-  "darkslategrey": [47,79,79,1], "darkturquoise": [0,206,209,1],
-  "darkviolet": [148,0,211,1], "deeppink": [255,20,147,1],
-  "deepskyblue": [0,191,255,1], "dimgray": [105,105,105,1],
-  "dimgrey": [105,105,105,1], "dodgerblue": [30,144,255,1],
-  "firebrick": [178,34,34,1], "floralwhite": [255,250,240,1],
-  "forestgreen": [34,139,34,1], "fuchsia": [255,0,255,1],
-  "gainsboro": [220,220,220,1], "ghostwhite": [248,248,255,1],
-  "gold": [255,215,0,1], "goldenrod": [218,165,32,1],
-  "gray": [128,128,128,1], "green": [0,128,0,1],
-  "greenyellow": [173,255,47,1], "grey": [128,128,128,1],
-  "honeydew": [240,255,240,1], "hotpink": [255,105,180,1],
-  "indianred": [205,92,92,1], "indigo": [75,0,130,1],
-  "ivory": [255,255,240,1], "khaki": [240,230,140,1],
-  "lavender": [230,230,250,1], "lavenderblush": [255,240,245,1],
-  "lawngreen": [124,252,0,1], "lemonchiffon": [255,250,205,1],
-  "lightblue": [173,216,230,1], "lightcoral": [240,128,128,1],
-  "lightcyan": [224,255,255,1], "lightgoldenrodyellow": [250,250,210,1],
-  "lightgray": [211,211,211,1], "lightgreen": [144,238,144,1],
-  "lightgrey": [211,211,211,1], "lightpink": [255,182,193,1],
-  "lightsalmon": [255,160,122,1], "lightseagreen": [32,178,170,1],
-  "lightskyblue": [135,206,250,1], "lightslategray": [119,136,153,1],
-  "lightslategrey": [119,136,153,1], "lightsteelblue": [176,196,222,1],
-  "lightyellow": [255,255,224,1], "lime": [0,255,0,1],
-  "limegreen": [50,205,50,1], "linen": [250,240,230,1],
-  "magenta": [255,0,255,1], "maroon": [128,0,0,1],
-  "mediumaquamarine": [102,205,170,1], "mediumblue": [0,0,205,1],
-  "mediumorchid": [186,85,211,1], "mediumpurple": [147,112,219,1],
-  "mediumseagreen": [60,179,113,1], "mediumslateblue": [123,104,238,1],
-  "mediumspringgreen": [0,250,154,1], "mediumturquoise": [72,209,204,1],
-  "mediumvioletred": [199,21,133,1], "midnightblue": [25,25,112,1],
-  "mintcream": [245,255,250,1], "mistyrose": [255,228,225,1],
-  "moccasin": [255,228,181,1], "navajowhite": [255,222,173,1],
-  "navy": [0,0,128,1], "oldlace": [253,245,230,1],
-  "olive": [128,128,0,1], "olivedrab": [107,142,35,1],
-  "orange": [255,165,0,1], "orangered": [255,69,0,1],
-  "orchid": [218,112,214,1], "palegoldenrod": [238,232,170,1],
-  "palegreen": [152,251,152,1], "paleturquoise": [175,238,238,1],
-  "palevioletred": [219,112,147,1], "papayawhip": [255,239,213,1],
-  "peachpuff": [255,218,185,1], "peru": [205,133,63,1],
-  "pink": [255,192,203,1], "plum": [221,160,221,1],
-  "powderblue": [176,224,230,1], "purple": [128,0,128,1],
-  "rebeccapurple": [102,51,153,1],
-  "red": [255,0,0,1], "rosybrown": [188,143,143,1],
-  "royalblue": [65,105,225,1], "saddlebrown": [139,69,19,1],
-  "salmon": [250,128,114,1], "sandybrown": [244,164,96,1],
-  "seagreen": [46,139,87,1], "seashell": [255,245,238,1],
-  "sienna": [160,82,45,1], "silver": [192,192,192,1],
-  "skyblue": [135,206,235,1], "slateblue": [106,90,205,1],
-  "slategray": [112,128,144,1], "slategrey": [112,128,144,1],
-  "snow": [255,250,250,1], "springgreen": [0,255,127,1],
-  "steelblue": [70,130,180,1], "tan": [210,180,140,1],
-  "teal": [0,128,128,1], "thistle": [216,191,216,1],
-  "tomato": [255,99,71,1], "turquoise": [64,224,208,1],
-  "violet": [238,130,238,1], "wheat": [245,222,179,1],
-  "white": [255,255,255,1], "whitesmoke": [245,245,245,1],
-  "yellow": [255,255,0,1], "yellowgreen": [154,205,50,1]}
+// find the leftmost node of a polygon ring
+function getLeftmost(start) {
+    var p = start,
+        leftmost = start;
+    do {
+        if (p.x < leftmost.x) leftmost = p;
+        p = p.next;
+    } while (p !== start);
 
-function clamp_css_byte(i) {  // Clamp to integer 0 .. 255.
-  i = Math.round(i);  // Seems to be what Chrome does (vs truncation).
-  return i < 0 ? 0 : i > 255 ? 255 : i;
+    return leftmost;
 }
 
-function clamp_css_float(f) {  // Clamp to float 0.0 .. 1.0.
-  return f < 0 ? 0 : f > 1 ? 1 : f;
+// check if a point lies within a convex triangle
+function pointInTriangle(ax, ay, bx, by, cx, cy, px, py) {
+    return (cx - px) * (ay - py) - (ax - px) * (cy - py) >= 0 &&
+           (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 &&
+           (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0;
 }
 
-function parse_css_int(str) {  // int or percentage.
-  if (str[str.length - 1] === '%')
-    return clamp_css_byte(parseFloat(str) / 100 * 255);
-  return clamp_css_byte(parseInt(str));
+// check if a diagonal between two polygon nodes is valid (lies in polygon interior)
+function isValidDiagonal(a, b) {
+    return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) &&
+           locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b);
 }
 
-function parse_css_float(str) {  // float or percentage.
-  if (str[str.length - 1] === '%')
-    return clamp_css_float(parseFloat(str) / 100);
-  return clamp_css_float(parseFloat(str));
+// signed area of a triangle
+function area(p, q, r) {
+    return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);
 }
 
-function css_hue_to_rgb(m1, m2, h) {
-  if (h < 0) h += 1;
-  else if (h > 1) h -= 1;
-
-  if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
-  if (h * 2 < 1) return m2;
-  if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
-  return m1;
+// check if two points are equal
+function equals(p1, p2) {
+    return p1.x === p2.x && p1.y === p2.y;
 }
 
-function parseCSSColor(css_str) {
-  // Remove all whitespace, not compliant, but should just be more accepting.
-  var str = css_str.replace(/ /g, '').toLowerCase();
-
-  // Color keywords (and transparent) lookup.
-  if (str in kCSSColorTable) return kCSSColorTable[str].slice();  // dup.
-
-  // #abc and #abc123 syntax.
-  if (str[0] === '#') {
-    if (str.length === 4) {
-      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.
-      if (!(iv >= 0 && iv <= 0xfff)) return null;  // Covers NaN.
-      return [((iv & 0xf00) >> 4) | ((iv & 0xf00) >> 8),
-              (iv & 0xf0) | ((iv & 0xf0) >> 4),
-              (iv & 0xf) | ((iv & 0xf) << 4),
-              1];
-    } else if (str.length === 7) {
-      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.
-      if (!(iv >= 0 && iv <= 0xffffff)) return null;  // Covers NaN.
-      return [(iv & 0xff0000) >> 16,
-              (iv & 0xff00) >> 8,
-              iv & 0xff,
-              1];
-    }
-
-    return null;
-  }
+// check if two segments intersect
+function intersects(p1, q1, p2, q2) {
+    if ((equals(p1, q1) && equals(p2, q2)) ||
+        (equals(p1, q2) && equals(p2, q1))) return true;
+    return area(p1, q1, p2) > 0 !== area(p1, q1, q2) > 0 &&
+           area(p2, q2, p1) > 0 !== area(p2, q2, q1) > 0;
+}
 
-  var op = str.indexOf('('), ep = str.indexOf(')');
-  if (op !== -1 && ep + 1 === str.length) {
-    var fname = str.substr(0, op);
-    var params = str.substr(op+1, ep-(op+1)).split(',');
-    var alpha = 1;  // To allow case fallthrough.
-    switch (fname) {
-      case 'rgba':
-        if (params.length !== 4) return null;
-        alpha = parse_css_float(params.pop());
-        // Fall through.
-      case 'rgb':
-        if (params.length !== 3) return null;
-        return [parse_css_int(params[0]),
-                parse_css_int(params[1]),
-                parse_css_int(params[2]),
-                alpha];
-      case 'hsla':
-        if (params.length !== 4) return null;
-        alpha = parse_css_float(params.pop());
-        // Fall through.
-      case 'hsl':
-        if (params.length !== 3) return null;
-        var h = (((parseFloat(params[0]) % 360) + 360) % 360) / 360;  // 0 .. 1
-        // NOTE(deanm): According to the CSS spec s/l should only be
-        // percentages, but we don't bother and let float or percentage.
-        var s = parse_css_float(params[1]);
-        var l = parse_css_float(params[2]);
-        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
-        var m1 = l * 2 - m2;
-        return [clamp_css_byte(css_hue_to_rgb(m1, m2, h+1/3) * 255),
-                clamp_css_byte(css_hue_to_rgb(m1, m2, h) * 255),
-                clamp_css_byte(css_hue_to_rgb(m1, m2, h-1/3) * 255),
-                alpha];
-      default:
-        return null;
-    }
-  }
+// check if a polygon diagonal intersects any polygon segments
+function intersectsPolygon(a, b) {
+    var p = a;
+    do {
+        if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&
+                intersects(p, p.next, a, b)) return true;
+        p = p.next;
+    } while (p !== a);
 
-  return null;
+    return false;
 }
 
-try { exports.parseCSSColor = parseCSSColor } catch(e) { }
+// check if a polygon diagonal is locally inside the polygon
+function locallyInside(a, b) {
+    return area(a.prev, a, a.next) < 0 ?
+        area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0 :
+        area(a, b, a.prev) < 0 || area(a, a.next, b) < 0;
+}
 
-},{}],77:[function(_dereq_,module,exports){
-'use strict';
+// check if the middle point of a polygon diagonal is inside the polygon
+function middleInside(a, b) {
+    var p = a,
+        inside = false,
+        px = (a.x + b.x) / 2,
+        py = (a.y + b.y) / 2;
+    do {
+        if (((p.y > py) !== (p.next.y > py)) && (px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x))
+            inside = !inside;
+        p = p.next;
+    } while (p !== a);
 
-module.exports = earcut;
+    return inside;
+}
 
-function earcut(data, holeIndices, dim) {
+// link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;
+// if one belongs to the outer ring and another to a hole, it merges it into a single ring
+function splitPolygon(a, b) {
+    var a2 = new Node(a.i, a.x, a.y),
+        b2 = new Node(b.i, b.x, b.y),
+        an = a.next,
+        bp = b.prev;
 
-    dim = dim || 2;
+    a.next = b;
+    b.prev = a;
 
-    var hasHoles = holeIndices && holeIndices.length,
-        outerLen = hasHoles ? holeIndices[0] * dim : data.length,
-        outerNode = linkedList(data, 0, outerLen, dim, true),
-        triangles = [];
+    a2.next = an;
+    an.prev = a2;
 
-    if (!outerNode) return triangles;
+    b2.next = a2;
+    a2.prev = b2;
 
-    var minX, minY, maxX, maxY, x, y, size;
+    bp.next = b2;
+    b2.prev = bp;
 
-    if (hasHoles) outerNode = eliminateHoles(data, holeIndices, outerNode, dim);
+    return b2;
+}
 
-    // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox
-    if (data.length > 80 * dim) {
-        minX = maxX = data[0];
-        minY = maxY = data[1];
+// create a node and optionally link it with previous one (in a circular doubly linked list)
+function insertNode(i, x, y, last) {
+    var p = new Node(i, x, y);
 
-        for (var i = dim; i < outerLen; i += dim) {
-            x = data[i];
-            y = data[i + 1];
-            if (x < minX) minX = x;
-            if (y < minY) minY = y;
-            if (x > maxX) maxX = x;
-            if (y > maxY) maxY = y;
-        }
+    if (!last) {
+        p.prev = p;
+        p.next = p;
 
-        // minX, minY and size are later used to transform coords into integers for z-order calculation
-        size = Math.max(maxX - minX, maxY - minY);
+    } else {
+        p.next = last.next;
+        p.prev = last;
+        last.next.prev = p;
+        last.next = p;
     }
+    return p;
+}
 
-    earcutLinked(outerNode, triangles, dim, minX, minY, size);
+function removeNode(p) {
+    p.next.prev = p.prev;
+    p.prev.next = p.next;
 
-    return triangles;
+    if (p.prevZ) p.prevZ.nextZ = p.nextZ;
+    if (p.nextZ) p.nextZ.prevZ = p.prevZ;
 }
 
-// create a circular doubly linked list from polygon points in the specified winding order
-function linkedList(data, start, end, dim, clockwise) {
-    var i, last;
+function Node(i, x, y) {
+    // vertice index in coordinates array
+    this.i = i;
 
-    if (clockwise === (signedArea(data, start, end, dim) > 0)) {
-        for (i = start; i < end; i += dim) last = insertNode(i, data[i], data[i + 1], last);
-    } else {
-        for (i = end - dim; i >= start; i -= dim) last = insertNode(i, data[i], data[i + 1], last);
-    }
+    // vertex coordinates
+    this.x = x;
+    this.y = y;
 
-    if (last && equals(last, last.next)) {
-        removeNode(last);
-        last = last.next;
-    }
+    // previous and next vertice nodes in a polygon ring
+    this.prev = null;
+    this.next = null;
 
-    return last;
-}
+    // z-order curve value
+    this.z = null;
 
-// eliminate colinear or duplicate points
-function filterPoints(start, end) {
-    if (!start) return start;
-    if (!end) end = start;
+    // previous and next nodes in z-order
+    this.prevZ = null;
+    this.nextZ = null;
 
-    var p = start,
-        again;
-    do {
-        again = false;
+    // indicates whether this is a steiner point
+    this.steiner = false;
+}
 
-        if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {
-            removeNode(p);
-            p = end = p.prev;
-            if (p === p.next) return null;
-            again = true;
+// return a percentage difference between the polygon area and its triangulation area;
+// used to verify correctness of triangulation
+earcut.deviation = function (data, holeIndices, dim, triangles) {
+    var hasHoles = holeIndices && holeIndices.length;
+    var outerLen = hasHoles ? holeIndices[0] * dim : data.length;
 
-        } else {
-            p = p.next;
+    var polygonArea = Math.abs(signedArea(data, 0, outerLen, dim));
+    if (hasHoles) {
+        for (var i = 0, len = holeIndices.length; i < len; i++) {
+            var start = holeIndices[i] * dim;
+            var end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
+            polygonArea -= Math.abs(signedArea(data, start, end, dim));
         }
-    } while (again || p !== end);
+    }
 
-    return end;
-}
+    var trianglesArea = 0;
+    for (i = 0; i < triangles.length; i += 3) {
+        var a = triangles[i] * dim;
+        var b = triangles[i + 1] * dim;
+        var c = triangles[i + 2] * dim;
+        trianglesArea += Math.abs(
+            (data[a] - data[c]) * (data[b + 1] - data[a + 1]) -
+            (data[a] - data[b]) * (data[c + 1] - data[a + 1]));
+    }
 
-// main ear slicing loop which triangulates a polygon (given as a linked list)
-function earcutLinked(ear, triangles, dim, minX, minY, size, pass) {
-    if (!ear) return;
+    return polygonArea === 0 && trianglesArea === 0 ? 0 :
+        Math.abs((trianglesArea - polygonArea) / polygonArea);
+};
 
-    // interlink polygon nodes in z-order
-    if (!pass && size) indexCurve(ear, minX, minY, size);
+function signedArea(data, start, end, dim) {
+    var sum = 0;
+    for (var i = start, j = end - dim; i < end; i += dim) {
+        sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);
+        j = i;
+    }
+    return sum;
+}
 
-    var stop = ear,
-        prev, next;
+// turn a polygon in a multi-dimensional array form (e.g. as in GeoJSON) into a form Earcut accepts
+earcut.flatten = function (data) {
+    var dim = data[0][0].length,
+        result = {vertices: [], holes: [], dimensions: dim},
+        holeIndex = 0;
 
-    // iterate through ears, slicing them one by one
-    while (ear.prev !== ear.next) {
-        prev = ear.prev;
-        next = ear.next;
+    for (var i = 0; i < data.length; i++) {
+        for (var j = 0; j < data[i].length; j++) {
+            for (var d = 0; d < dim; d++) result.vertices.push(data[i][j][d]);
+        }
+        if (i > 0) {
+            holeIndex += data[i - 1].length;
+            result.holes.push(holeIndex);
+        }
+    }
+    return result;
+};
 
-        if (size ? isEarHashed(ear, minX, minY, size) : isEar(ear)) {
-            // cut off the triangle
-            triangles.push(prev.i / dim);
-            triangles.push(ear.i / dim);
-            triangles.push(next.i / dim);
+},{}],73:[function(_dereq_,module,exports){
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-            removeNode(ear);
+function EventEmitter() {
+  this._events = this._events || {};
+  this._maxListeners = this._maxListeners || undefined;
+}
+module.exports = EventEmitter;
 
-            // skipping the next vertice leads to less sliver triangles
-            ear = next.next;
-            stop = next.next;
+// Backwards-compat with node 0.10.x
+EventEmitter.EventEmitter = EventEmitter;
 
-            continue;
-        }
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._maxListeners = undefined;
 
-        ear = next;
+// By default EventEmitters will print a warning if more than 10 listeners are
+// added to it. This is a useful default which helps finding memory leaks.
+EventEmitter.defaultMaxListeners = 10;
 
-        // if we looped through the whole remaining polygon and can't find any more ears
-        if (ear === stop) {
-            // try filtering points and slicing again
-            if (!pass) {
-                earcutLinked(filterPoints(ear), triangles, dim, minX, minY, size, 1);
+// Obviously not all Emitters should be limited to 10. This function allows
+// that to be increased. Set to zero for unlimited.
+EventEmitter.prototype.setMaxListeners = function(n) {
+  if (!isNumber(n) || n < 0 || isNaN(n))
+    throw TypeError('n must be a positive number');
+  this._maxListeners = n;
+  return this;
+};
 
-            // if this didn't work, try curing all small self-intersections locally
-            } else if (pass === 1) {
-                ear = cureLocalIntersections(ear, triangles, dim);
-                earcutLinked(ear, triangles, dim, minX, minY, size, 2);
+EventEmitter.prototype.emit = function(type) {
+  var er, handler, len, args, i, listeners;
 
-            // as a last resort, try splitting the remaining polygon into two
-            } else if (pass === 2) {
-                splitEarcut(ear, triangles, dim, minX, minY, size);
-            }
+  if (!this._events)
+    this._events = {};
 
-            break;
-        }
+  // If there is no 'error' event listener then throw.
+  if (type === 'error') {
+    if (!this._events.error ||
+        (isObject(this._events.error) && !this._events.error.length)) {
+      er = arguments[1];
+      if (er instanceof Error) {
+        throw er; // Unhandled 'error' event
+      } else {
+        // At least give some kind of context to the user
+        var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
+        err.context = er;
+        throw err;
+      }
     }
-}
-
-// check whether a polygon node forms a valid ear with adjacent nodes
-function isEar(ear) {
-    var a = ear.prev,
-        b = ear,
-        c = ear.next;
+  }
 
-    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear
+  handler = this._events[type];
 
-    // now make sure we don't have other points inside the potential ear
-    var p = ear.next.next;
+  if (isUndefined(handler))
+    return false;
 
-    while (p !== ear.prev) {
-        if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
-            area(p.prev, p, p.next) >= 0) return false;
-        p = p.next;
+  if (isFunction(handler)) {
+    switch (arguments.length) {
+      // fast cases
+      case 1:
+        handler.call(this);
+        break;
+      case 2:
+        handler.call(this, arguments[1]);
+        break;
+      case 3:
+        handler.call(this, arguments[1], arguments[2]);
+        break;
+      // slower
+      default:
+        args = Array.prototype.slice.call(arguments, 1);
+        handler.apply(this, args);
     }
+  } else if (isObject(handler)) {
+    args = Array.prototype.slice.call(arguments, 1);
+    listeners = handler.slice();
+    len = listeners.length;
+    for (i = 0; i < len; i++)
+      listeners[i].apply(this, args);
+  }
 
-    return true;
-}
+  return true;
+};
 
-function isEarHashed(ear, minX, minY, size) {
-    var a = ear.prev,
-        b = ear,
-        c = ear.next;
+EventEmitter.prototype.addListener = function(type, listener) {
+  var m;
 
-    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear
+  if (!isFunction(listener))
+    throw TypeError('listener must be a function');
 
-    // triangle bbox; min & max are calculated like this for speed
-    var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x),
-        minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y),
-        maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x),
-        maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y);
+  if (!this._events)
+    this._events = {};
 
-    // z-order range for the current triangle bbox;
-    var minZ = zOrder(minTX, minTY, minX, minY, size),
-        maxZ = zOrder(maxTX, maxTY, minX, minY, size);
+  // To avoid recursion in the case that type === "newListener"! Before
+  // adding it to the listeners, first emit "newListener".
+  if (this._events.newListener)
+    this.emit('newListener', type,
+              isFunction(listener.listener) ?
+              listener.listener : listener);
 
-    // first look for points inside the triangle in increasing z-order
-    var p = ear.nextZ;
+  if (!this._events[type])
+    // Optimize the case of one listener. Don't need the extra array object.
+    this._events[type] = listener;
+  else if (isObject(this._events[type]))
+    // If we've already got an array, just append.
+    this._events[type].push(listener);
+  else
+    // Adding the second element, need to change to array.
+    this._events[type] = [this._events[type], listener];
 
-    while (p && p.z <= maxZ) {
-        if (p !== ear.prev && p !== ear.next &&
-            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
-            area(p.prev, p, p.next) >= 0) return false;
-        p = p.nextZ;
+  // Check for listener leak
+  if (isObject(this._events[type]) && !this._events[type].warned) {
+    if (!isUndefined(this._maxListeners)) {
+      m = this._maxListeners;
+    } else {
+      m = EventEmitter.defaultMaxListeners;
     }
 
-    // then look for points in decreasing z-order
-    p = ear.prevZ;
-
-    while (p && p.z >= minZ) {
-        if (p !== ear.prev && p !== ear.next &&
-            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
-            area(p.prev, p, p.next) >= 0) return false;
-        p = p.prevZ;
+    if (m && m > 0 && this._events[type].length > m) {
+      this._events[type].warned = true;
+      console.error('(node) warning: possible EventEmitter memory ' +
+                    'leak detected. %d listeners added. ' +
+                    'Use emitter.setMaxListeners() to increase limit.',
+                    this._events[type].length);
+      if (typeof console.trace === 'function') {
+        // not supported in IE 10
+        console.trace();
+      }
     }
+  }
 
-    return true;
-}
+  return this;
+};
 
-// go through all polygon nodes and cure small local self-intersections
-function cureLocalIntersections(start, triangles, dim) {
-    var p = start;
-    do {
-        var a = p.prev,
-            b = p.next.next;
+EventEmitter.prototype.on = EventEmitter.prototype.addListener;
 
-        if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {
+EventEmitter.prototype.once = function(type, listener) {
+  if (!isFunction(listener))
+    throw TypeError('listener must be a function');
 
-            triangles.push(a.i / dim);
-            triangles.push(p.i / dim);
-            triangles.push(b.i / dim);
+  var fired = false;
 
-            // remove two nodes involved
-            removeNode(p);
-            removeNode(p.next);
+  function g() {
+    this.removeListener(type, g);
 
-            p = start = b;
-        }
-        p = p.next;
-    } while (p !== start);
+    if (!fired) {
+      fired = true;
+      listener.apply(this, arguments);
+    }
+  }
 
-    return p;
-}
+  g.listener = listener;
+  this.on(type, g);
 
-// try splitting polygon into two and triangulate them independently
-function splitEarcut(start, triangles, dim, minX, minY, size) {
-    // look for a valid diagonal that divides the polygon into two
-    var a = start;
-    do {
-        var b = a.next.next;
-        while (b !== a.prev) {
-            if (a.i !== b.i && isValidDiagonal(a, b)) {
-                // split the polygon in two by the diagonal
-                var c = splitPolygon(a, b);
+  return this;
+};
 
-                // filter colinear points around the cuts
-                a = filterPoints(a, a.next);
-                c = filterPoints(c, c.next);
+// emits a 'removeListener' event iff the listener was removed
+EventEmitter.prototype.removeListener = function(type, listener) {
+  var list, position, length, i;
 
-                // run earcut on each half
-                earcutLinked(a, triangles, dim, minX, minY, size);
-                earcutLinked(c, triangles, dim, minX, minY, size);
-                return;
-            }
-            b = b.next;
-        }
-        a = a.next;
-    } while (a !== start);
-}
+  if (!isFunction(listener))
+    throw TypeError('listener must be a function');
 
-// link every hole into the outer loop, producing a single-ring polygon without holes
-function eliminateHoles(data, holeIndices, outerNode, dim) {
-    var queue = [],
-        i, len, start, end, list;
+  if (!this._events || !this._events[type])
+    return this;
 
-    for (i = 0, len = holeIndices.length; i < len; i++) {
-        start = holeIndices[i] * dim;
-        end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
-        list = linkedList(data, start, end, dim, false);
-        if (list === list.next) list.steiner = true;
-        queue.push(getLeftmost(list));
-    }
+  list = this._events[type];
+  length = list.length;
+  position = -1;
 
-    queue.sort(compareX);
+  if (list === listener ||
+      (isFunction(list.listener) && list.listener === listener)) {
+    delete this._events[type];
+    if (this._events.removeListener)
+      this.emit('removeListener', type, listener);
 
-    // process holes from left to right
-    for (i = 0; i < queue.length; i++) {
-        eliminateHole(queue[i], outerNode);
-        outerNode = filterPoints(outerNode, outerNode.next);
+  } else if (isObject(list)) {
+    for (i = length; i-- > 0;) {
+      if (list[i] === listener ||
+          (list[i].listener && list[i].listener === listener)) {
+        position = i;
+        break;
+      }
     }
 
-    return outerNode;
-}
-
-function compareX(a, b) {
-    return a.x - b.x;
-}
+    if (position < 0)
+      return this;
 
-// find a bridge between vertices that connects hole with an outer ring and and link it
-function eliminateHole(hole, outerNode) {
-    outerNode = findHoleBridge(hole, outerNode);
-    if (outerNode) {
-        var b = splitPolygon(outerNode, hole);
-        filterPoints(b, b.next);
+    if (list.length === 1) {
+      list.length = 0;
+      delete this._events[type];
+    } else {
+      list.splice(position, 1);
     }
-}
-
-// David Eberly's algorithm for finding a bridge between hole and outer polygon
-function findHoleBridge(hole, outerNode) {
-    var p = outerNode,
-        hx = hole.x,
-        hy = hole.y,
-        qx = -Infinity,
-        m;
-
-    // find a segment intersected by a ray from the hole's leftmost point to the left;
-    // segment's endpoint with lesser x will be potential connection point
-    do {
-        if (hy <= p.y && hy >= p.next.y) {
-            var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y);
-            if (x <= hx && x > qx) {
-                qx = x;
-                if (x === hx) {
-                    if (hy === p.y) return p;
-                    if (hy === p.next.y) return p.next;
-                }
-                m = p.x < p.next.x ? p : p.next;
-            }
-        }
-        p = p.next;
-    } while (p !== outerNode);
 
-    if (!m) return null;
-
-    if (hx === qx) return m.prev; // hole touches outer segment; pick lower endpoint
-
-    // look for points inside the triangle of hole point, segment intersection and endpoint;
-    // if there are no points found, we have a valid connection;
-    // otherwise choose the point of the minimum angle with the ray as connection point
-
-    var stop = m,
-        mx = m.x,
-        my = m.y,
-        tanMin = Infinity,
-        tan;
+    if (this._events.removeListener)
+      this.emit('removeListener', type, listener);
+  }
 
-    p = m.next;
+  return this;
+};
 
-    while (p !== stop) {
-        if (hx >= p.x && p.x >= mx &&
-                pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {
+EventEmitter.prototype.removeAllListeners = function(type) {
+  var key, listeners;
 
-            tan = Math.abs(hy - p.y) / (hx - p.x); // tangential
+  if (!this._events)
+    return this;
 
-            if ((tan < tanMin || (tan === tanMin && p.x > m.x)) && locallyInside(p, hole)) {
-                m = p;
-                tanMin = tan;
-            }
-        }
+  // not listening for removeListener, no need to emit
+  if (!this._events.removeListener) {
+    if (arguments.length === 0)
+      this._events = {};
+    else if (this._events[type])
+      delete this._events[type];
+    return this;
+  }
 
-        p = p.next;
+  // emit removeListener for all listeners on all events
+  if (arguments.length === 0) {
+    for (key in this._events) {
+      if (key === 'removeListener') continue;
+      this.removeAllListeners(key);
     }
+    this.removeAllListeners('removeListener');
+    this._events = {};
+    return this;
+  }
 
-    return m;
-}
-
-// interlink polygon nodes in z-order
-function indexCurve(start, minX, minY, size) {
-    var p = start;
-    do {
-        if (p.z === null) p.z = zOrder(p.x, p.y, minX, minY, size);
-        p.prevZ = p.prev;
-        p.nextZ = p.next;
-        p = p.next;
-    } while (p !== start);
-
-    p.prevZ.nextZ = null;
-    p.prevZ = null;
-
-    sortLinked(p);
-}
-
-// Simon Tatham's linked list merge sort algorithm
-// http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
-function sortLinked(list) {
-    var i, p, q, e, tail, numMerges, pSize, qSize,
-        inSize = 1;
-
-    do {
-        p = list;
-        list = null;
-        tail = null;
-        numMerges = 0;
-
-        while (p) {
-            numMerges++;
-            q = p;
-            pSize = 0;
-            for (i = 0; i < inSize; i++) {
-                pSize++;
-                q = q.nextZ;
-                if (!q) break;
-            }
-
-            qSize = inSize;
-
-            while (pSize > 0 || (qSize > 0 && q)) {
-
-                if (pSize === 0) {
-                    e = q;
-                    q = q.nextZ;
-                    qSize--;
-                } else if (qSize === 0 || !q) {
-                    e = p;
-                    p = p.nextZ;
-                    pSize--;
-                } else if (p.z <= q.z) {
-                    e = p;
-                    p = p.nextZ;
-                    pSize--;
-                } else {
-                    e = q;
-                    q = q.nextZ;
-                    qSize--;
-                }
-
-                if (tail) tail.nextZ = e;
-                else list = e;
-
-                e.prevZ = tail;
-                tail = e;
-            }
-
-            p = q;
-        }
-
-        tail.nextZ = null;
-        inSize *= 2;
-
-    } while (numMerges > 1);
-
-    return list;
-}
-
-// z-order of a point given coords and size of the data bounding box
-function zOrder(x, y, minX, minY, size) {
-    // coords are transformed into non-negative 15-bit integer range
-    x = 32767 * (x - minX) / size;
-    y = 32767 * (y - minY) / size;
-
-    x = (x | (x << 8)) & 0x00FF00FF;
-    x = (x | (x << 4)) & 0x0F0F0F0F;
-    x = (x | (x << 2)) & 0x33333333;
-    x = (x | (x << 1)) & 0x55555555;
-
-    y = (y | (y << 8)) & 0x00FF00FF;
-    y = (y | (y << 4)) & 0x0F0F0F0F;
-    y = (y | (y << 2)) & 0x33333333;
-    y = (y | (y << 1)) & 0x55555555;
-
-    return x | (y << 1);
-}
-
-// find the leftmost node of a polygon ring
-function getLeftmost(start) {
-    var p = start,
-        leftmost = start;
-    do {
-        if (p.x < leftmost.x) leftmost = p;
-        p = p.next;
-    } while (p !== start);
-
-    return leftmost;
-}
-
-// check if a point lies within a convex triangle
-function pointInTriangle(ax, ay, bx, by, cx, cy, px, py) {
-    return (cx - px) * (ay - py) - (ax - px) * (cy - py) >= 0 &&
-           (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 &&
-           (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0;
-}
-
-// check if a diagonal between two polygon nodes is valid (lies in polygon interior)
-function isValidDiagonal(a, b) {
-    return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) &&
-           locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b);
-}
-
-// signed area of a triangle
-function area(p, q, r) {
-    return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);
-}
-
-// check if two points are equal
-function equals(p1, p2) {
-    return p1.x === p2.x && p1.y === p2.y;
-}
-
-// check if two segments intersect
-function intersects(p1, q1, p2, q2) {
-    if ((equals(p1, q1) && equals(p2, q2)) ||
-        (equals(p1, q2) && equals(p2, q1))) return true;
-    return area(p1, q1, p2) > 0 !== area(p1, q1, q2) > 0 &&
-           area(p2, q2, p1) > 0 !== area(p2, q2, q1) > 0;
-}
-
-// check if a polygon diagonal intersects any polygon segments
-function intersectsPolygon(a, b) {
-    var p = a;
-    do {
-        if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&
-                intersects(p, p.next, a, b)) return true;
-        p = p.next;
-    } while (p !== a);
-
-    return false;
-}
-
-// check if a polygon diagonal is locally inside the polygon
-function locallyInside(a, b) {
-    return area(a.prev, a, a.next) < 0 ?
-        area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0 :
-        area(a, b, a.prev) < 0 || area(a, a.next, b) < 0;
-}
-
-// check if the middle point of a polygon diagonal is inside the polygon
-function middleInside(a, b) {
-    var p = a,
-        inside = false,
-        px = (a.x + b.x) / 2,
-        py = (a.y + b.y) / 2;
-    do {
-        if (((p.y > py) !== (p.next.y > py)) && (px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x))
-            inside = !inside;
-        p = p.next;
-    } while (p !== a);
-
-    return inside;
-}
-
-// link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;
-// if one belongs to the outer ring and another to a hole, it merges it into a single ring
-function splitPolygon(a, b) {
-    var a2 = new Node(a.i, a.x, a.y),
-        b2 = new Node(b.i, b.x, b.y),
-        an = a.next,
-        bp = b.prev;
-
-    a.next = b;
-    b.prev = a;
+  listeners = this._events[type];
 
-    a2.next = an;
-    an.prev = a2;
+  if (isFunction(listeners)) {
+    this.removeListener(type, listeners);
+  } else if (listeners) {
+    // LIFO order
+    while (listeners.length)
+      this.removeListener(type, listeners[listeners.length - 1]);
+  }
+  delete this._events[type];
 
-    b2.next = a2;
-    a2.prev = b2;
+  return this;
+};
 
-    bp.next = b2;
-    b2.prev = bp;
+EventEmitter.prototype.listeners = function(type) {
+  var ret;
+  if (!this._events || !this._events[type])
+    ret = [];
+  else if (isFunction(this._events[type]))
+    ret = [this._events[type]];
+  else
+    ret = this._events[type].slice();
+  return ret;
+};
 
-    return b2;
-}
+EventEmitter.prototype.listenerCount = function(type) {
+  if (this._events) {
+    var evlistener = this._events[type];
 
-// create a node and optionally link it with previous one (in a circular doubly linked list)
-function insertNode(i, x, y, last) {
-    var p = new Node(i, x, y);
+    if (isFunction(evlistener))
+      return 1;
+    else if (evlistener)
+      return evlistener.length;
+  }
+  return 0;
+};
 
-    if (!last) {
-        p.prev = p;
-        p.next = p;
+EventEmitter.listenerCount = function(emitter, type) {
+  return emitter.listenerCount(type);
+};
 
-    } else {
-        p.next = last.next;
-        p.prev = last;
-        last.next.prev = p;
-        last.next = p;
-    }
-    return p;
+function isFunction(arg) {
+  return typeof arg === 'function';
 }
 
-function removeNode(p) {
-    p.next.prev = p.prev;
-    p.prev.next = p.next;
-
-    if (p.prevZ) p.prevZ.nextZ = p.nextZ;
-    if (p.nextZ) p.nextZ.prevZ = p.prevZ;
+function isNumber(arg) {
+  return typeof arg === 'number';
 }
 
-function Node(i, x, y) {
-    // vertice index in coordinates array
-    this.i = i;
-
-    // vertex coordinates
-    this.x = x;
-    this.y = y;
-
-    // previous and next vertice nodes in a polygon ring
-    this.prev = null;
-    this.next = null;
-
-    // z-order curve value
-    this.z = null;
-
-    // previous and next nodes in z-order
-    this.prevZ = null;
-    this.nextZ = null;
-
-    // indicates whether this is a steiner point
-    this.steiner = false;
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
 }
 
-// return a percentage difference between the polygon area and its triangulation area;
-// used to verify correctness of triangulation
-earcut.deviation = function (data, holeIndices, dim, triangles) {
-    var hasHoles = holeIndices && holeIndices.length;
-    var outerLen = hasHoles ? holeIndices[0] * dim : data.length;
-
-    var polygonArea = Math.abs(signedArea(data, 0, outerLen, dim));
-    if (hasHoles) {
-        for (var i = 0, len = holeIndices.length; i < len; i++) {
-            var start = holeIndices[i] * dim;
-            var end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
-            polygonArea -= Math.abs(signedArea(data, start, end, dim));
-        }
-    }
-
-    var trianglesArea = 0;
-    for (i = 0; i < triangles.length; i += 3) {
-        var a = triangles[i] * dim;
-        var b = triangles[i + 1] * dim;
-        var c = triangles[i + 2] * dim;
-        trianglesArea += Math.abs(
-            (data[a] - data[c]) * (data[b + 1] - data[a + 1]) -
-            (data[a] - data[b]) * (data[c + 1] - data[a + 1]));
-    }
-
-    return polygonArea === 0 && trianglesArea === 0 ? 0 :
-        Math.abs((trianglesArea - polygonArea) / polygonArea);
-};
-
-function signedArea(data, start, end, dim) {
-    var sum = 0;
-    for (var i = start, j = end - dim; i < end; i += dim) {
-        sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);
-        j = i;
-    }
-    return sum;
+function isUndefined(arg) {
+  return arg === void 0;
 }
 
-// turn a polygon in a multi-dimensional array form (e.g. as in GeoJSON) into a form Earcut accepts
-earcut.flatten = function (data) {
-    var dim = data[0][0].length,
-        result = {vertices: [], holes: [], dimensions: dim},
-        holeIndex = 0;
-
-    for (var i = 0; i < data.length; i++) {
-        for (var j = 0; j < data[i].length; j++) {
-            for (var d = 0; d < dim; d++) result.vertices.push(data[i][j][d]);
-        }
-        if (i > 0) {
-            holeIndex += data[i - 1].length;
-            result.holes.push(holeIndex);
-        }
-    }
-    return result;
-};
-
-},{}],78:[function(_dereq_,module,exports){
+},{}],74:[function(_dereq_,module,exports){
 (function(){function m(a,b){document.addEventListener?a.addEventListener("scroll",b,!1):a.attachEvent("scroll",b)}function n(a){document.body?a():document.addEventListener?document.addEventListener("DOMContentLoaded",function c(){document.removeEventListener("DOMContentLoaded",c);a()}):document.attachEvent("onreadystatechange",function l(){if("interactive"==document.readyState||"complete"==document.readyState)document.detachEvent("onreadystatechange",l),a()})};function t(a){this.a=document.createElement("div");this.a.setAttribute("aria-hidden","true");this.a.appendChild(document.createTextNode(a));this.b=document.createElement("span");this.c=document.createElement("span");this.h=document.createElement("span");this.f=document.createElement("span");this.g=-1;this.b.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";this.c.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";
 this.f.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";this.h.style.cssText="display:inline-block;width:200%;height:200%;font-size:16px;max-width:none;";this.b.appendChild(this.h);this.c.appendChild(this.f);this.a.appendChild(this.b);this.a.appendChild(this.c)}
 function x(a,b){a.a.style.cssText="max-width:none;min-width:20px;min-height:20px;display:inline-block;overflow:hidden;position:absolute;width:auto;margin:0;padding:0;top:-999px;left:-999px;white-space:nowrap;font:"+b+";"}function y(a){var b=a.a.offsetWidth,c=b+100;a.f.style.width=c+"px";a.c.scrollLeft=c;a.b.scrollLeft=a.b.scrollWidth+100;return a.g!==b?(a.g=b,!0):!1}function z(a,b){function c(){var a=l;y(a)&&a.a.parentNode&&b(a.g)}var l=a;m(a.b,c);m(a.c,c);y(a)};function A(a,b){var c=b||{};this.family=a;this.style=c.style||"normal";this.weight=c.weight||"normal";this.stretch=c.stretch||"normal"}var B=null,C=null,E=null,F=null;function I(){if(null===E){var a=document.createElement("div");try{a.style.font="condensed 100px sans-serif"}catch(b){}E=""!==a.style.font}return E}function J(a,b){return[a.style,a.weight,I()?a.stretch:"","100px",b].join(" ")}
@@ -5222,7 +4709,7 @@ c){r=setTimeout(c,D)});Promise.race([K,e]).then(function(){clearTimeout(r);a(c)}
 function H(){if((new Date).getTime()-G>=D)d.parentNode&&d.parentNode.removeChild(d),b(c);else{var a=document.hidden;if(!0===a||void 0===a)g=f.a.offsetWidth,h=p.a.offsetWidth,k=q.a.offsetWidth,e();r=setTimeout(H,50)}}var f=new t(l),p=new t(l),q=new t(l),g=-1,h=-1,k=-1,u=-1,v=-1,w=-1,d=document.createElement("div");d.dir="ltr";x(f,J(c,"sans-serif"));x(p,J(c,"serif"));x(q,J(c,"monospace"));d.appendChild(f.a);d.appendChild(p.a);d.appendChild(q.a);document.body.appendChild(d);u=f.a.offsetWidth;v=p.a.offsetWidth;
 w=q.a.offsetWidth;H();z(f,function(a){g=a;e()});x(f,J(c,'"'+c.family+'",sans-serif'));z(p,function(a){h=a;e()});x(p,J(c,'"'+c.family+'",serif'));z(q,function(a){k=a;e()});x(q,J(c,'"'+c.family+'",monospace'))})})};"undefined"!==typeof module?module.exports=A:(window.FontFaceObserver=A,window.FontFaceObserver.prototype.load=A.prototype.load);}());
 
-},{}],79:[function(_dereq_,module,exports){
+},{}],75:[function(_dereq_,module,exports){
 'use strict';
 
 module.exports = clip;
@@ -5373,7 +4860,7 @@ function newSlice(slices, slice, area, dist, outer) {
     return [];
 }
 
-},{"./feature":81}],80:[function(_dereq_,module,exports){
+},{"./feature":77}],76:[function(_dereq_,module,exports){
 'use strict';
 
 module.exports = convert;
@@ -5496,7 +4983,7 @@ function calcSize(points) {
     points.dist = dist;
 }
 
-},{"./feature":81,"./simplify":83}],81:[function(_dereq_,module,exports){
+},{"./feature":77,"./simplify":79}],77:[function(_dereq_,module,exports){
 'use strict';
 
 module.exports = createFeature;
@@ -5541,7 +5028,7 @@ function calcRingBBox(min, max, points) {
     }
 }
 
-},{}],82:[function(_dereq_,module,exports){
+},{}],78:[function(_dereq_,module,exports){
 'use strict';
 
 module.exports = geojsonvt;
@@ -5785,7 +5272,7 @@ function isClippedSquare(tile, extent, buffer) {
     return true;
 }
 
-},{"./clip":79,"./convert":80,"./tile":84,"./transform":85,"./wrap":86}],83:[function(_dereq_,module,exports){
+},{"./clip":75,"./convert":76,"./tile":80,"./transform":81,"./wrap":82}],79:[function(_dereq_,module,exports){
 'use strict';
 
 module.exports = simplify;
@@ -5861,7 +5348,7 @@ function getSqSegDist(p, a, b) {
     return dx * dx + dy * dy;
 }
 
-},{}],84:[function(_dereq_,module,exports){
+},{}],80:[function(_dereq_,module,exports){
 'use strict';
 
 module.exports = createTile;
@@ -5969,7 +5456,7 @@ function signedArea(ring) {
     return sum;
 }
 
-},{}],85:[function(_dereq_,module,exports){
+},{}],81:[function(_dereq_,module,exports){
 'use strict';
 
 exports.tile = transformTile;
@@ -6012,7 +5499,7 @@ function transformPoint(p, extent, z2, tx, ty) {
     return [x, y];
 }
 
-},{}],86:[function(_dereq_,module,exports){
+},{}],82:[function(_dereq_,module,exports){
 'use strict';
 
 var clip = _dereq_('./clip');
@@ -6070,7 +5557,7 @@ function shiftCoords(points, offset) {
     return newPoints;
 }
 
-},{"./clip":79,"./feature":81}],87:[function(_dereq_,module,exports){
+},{"./clip":75,"./feature":77}],83:[function(_dereq_,module,exports){
 module.exports = invert
 
 /**
@@ -6109,7 +5596,7 @@ function invert(out, a) {
   return out
 }
 
-},{}],88:[function(_dereq_,module,exports){
+},{}],84:[function(_dereq_,module,exports){
 module.exports = normalFromMat4
 
 /**
@@ -6166,7 +5653,7 @@ function normalFromMat4(out, a) {
   return out
 }
 
-},{}],89:[function(_dereq_,module,exports){
+},{}],85:[function(_dereq_,module,exports){
 module.exports = copy;
 
 /**
@@ -6195,7 +5682,7 @@ function copy(out, a) {
     out[15] = a[15];
     return out;
 };
-},{}],90:[function(_dereq_,module,exports){
+},{}],86:[function(_dereq_,module,exports){
 module.exports = identity;
 
 /**
@@ -6223,7 +5710,7 @@ function identity(out) {
     out[15] = 1;
     return out;
 };
-},{}],91:[function(_dereq_,module,exports){
+},{}],87:[function(_dereq_,module,exports){
 var identity = _dereq_('./identity');
 
 module.exports = lookAt;
@@ -6314,7 +5801,7 @@ function lookAt(out, eye, center, up) {
 
     return out;
 };
-},{"./identity":90}],92:[function(_dereq_,module,exports){
+},{"./identity":86}],88:[function(_dereq_,module,exports){
 module.exports = multiply;
 
 /**
@@ -6357,7 +5844,7 @@ function multiply(out, a, b) {
     out[15] = b0*a03 + b1*a13 + b2*a23 + b3*a33;
     return out;
 };
-},{}],93:[function(_dereq_,module,exports){
+},{}],89:[function(_dereq_,module,exports){
 module.exports = perspective;
 
 /**
@@ -6391,7 +5878,7 @@ function perspective(out, fovy, aspect, near, far) {
     out[15] = 0;
     return out;
 };
-},{}],94:[function(_dereq_,module,exports){
+},{}],90:[function(_dereq_,module,exports){
 module.exports = scale;
 
 /**
@@ -6423,7 +5910,7 @@ function scale(out, a, v) {
     out[15] = a[15];
     return out;
 };
-},{}],95:[function(_dereq_,module,exports){
+},{}],91:[function(_dereq_,module,exports){
 module.exports = translate;
 
 /**
@@ -6462,7 +5949,7 @@ function translate(out, a, v) {
 
     return out;
 };
-},{}],96:[function(_dereq_,module,exports){
+},{}],92:[function(_dereq_,module,exports){
 module.exports = parseErrors
 
 function parseErrors(log) {
@@ -6490,6 +5977,147 @@ function parseErrors(log) {
   return logs
 }
 
+},{}],93:[function(_dereq_,module,exports){
+exports.read = function (buffer, offset, isLE, mLen, nBytes) {
+  var e, m
+  var eLen = nBytes * 8 - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var nBits = -7
+  var i = isLE ? (nBytes - 1) : 0
+  var d = isLE ? -1 : 1
+  var s = buffer[offset + i]
+
+  i += d
+
+  e = s & ((1 << (-nBits)) - 1)
+  s >>= (-nBits)
+  nBits += eLen
+  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+
+  m = e & ((1 << (-nBits)) - 1)
+  e >>= (-nBits)
+  nBits += mLen
+  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+
+  if (e === 0) {
+    e = 1 - eBias
+  } else if (e === eMax) {
+    return m ? NaN : ((s ? -1 : 1) * Infinity)
+  } else {
+    m = m + Math.pow(2, mLen)
+    e = e - eBias
+  }
+  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
+}
+
+exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
+  var e, m, c
+  var eLen = nBytes * 8 - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
+  var i = isLE ? 0 : (nBytes - 1)
+  var d = isLE ? 1 : -1
+  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
+
+  value = Math.abs(value)
+
+  if (isNaN(value) || value === Infinity) {
+    m = isNaN(value) ? 1 : 0
+    e = eMax
+  } else {
+    e = Math.floor(Math.log(value) / Math.LN2)
+    if (value * (c = Math.pow(2, -e)) < 1) {
+      e--
+      c *= 2
+    }
+    if (e + eBias >= 1) {
+      value += rt / c
+    } else {
+      value += rt * Math.pow(2, 1 - eBias)
+    }
+    if (value * c >= 2) {
+      e++
+      c /= 2
+    }
+
+    if (e + eBias >= eMax) {
+      m = 0
+      e = eMax
+    } else if (e + eBias >= 1) {
+      m = (value * c - 1) * Math.pow(2, mLen)
+      e = e + eBias
+    } else {
+      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
+      e = 0
+    }
+  }
+
+  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
+
+  e = (e << mLen) | m
+  eLen += mLen
+  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
+
+  buffer[offset + i - d] |= s * 128
+}
+
+},{}],94:[function(_dereq_,module,exports){
+if (typeof Object.create === 'function') {
+  // implementation from standard node.js 'util' module
+  module.exports = function inherits(ctor, superCtor) {
+    ctor.super_ = superCtor
+    ctor.prototype = Object.create(superCtor.prototype, {
+      constructor: {
+        value: ctor,
+        enumerable: false,
+        writable: true,
+        configurable: true
+      }
+    });
+  };
+} else {
+  // old school shim for old browsers
+  module.exports = function inherits(ctor, superCtor) {
+    ctor.super_ = superCtor
+    var TempCtor = function () {}
+    TempCtor.prototype = superCtor.prototype
+    ctor.prototype = new TempCtor()
+    ctor.prototype.constructor = ctor
+  }
+}
+
+},{}],95:[function(_dereq_,module,exports){
+/*!
+ * Determine if an object is a Buffer
+ *
+ * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
+ * @license  MIT
+ */
+
+// The _isBuffer check is for Safari 5-7 support, because it's missing
+// Object.prototype.constructor. Remove this eventually
+module.exports = function (obj) {
+  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
+}
+
+function isBuffer (obj) {
+  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
+}
+
+// For Node v0.10 support. Remove this eventually.
+function isSlowBuffer (obj) {
+  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
+}
+
+},{}],96:[function(_dereq_,module,exports){
+var toString = {}.toString;
+
+module.exports = Array.isArray || function (arr) {
+  return toString.call(arr) == '[object Array]';
+};
+
 },{}],97:[function(_dereq_,module,exports){
 'use strict';
 
@@ -8736,7 +8364,7 @@ module.exports = new Type('tag:yaml.org,2002:binary', {
   represent: representYamlBinary
 });
 
-},{"../type":109,"buffer":1}],111:[function(_dereq_,module,exports){
+},{"../type":109,"buffer":4}],111:[function(_dereq_,module,exports){
 'use strict';
 
 var Type = _dereq_('../type');
@@ -9878,7 +9506,7 @@ exports.uncompressWorker = function () {
     return new FlateWorker("Inflate", {});
 };
 
-},{"./stream/GenericWorker":150,"./utils":154,"pako":160}],133:[function(_dereq_,module,exports){
+},{"./stream/GenericWorker":150,"./utils":154,"pako":164}],133:[function(_dereq_,module,exports){
 'use strict';
 
 /**
@@ -10132,7 +9760,7 @@ NodejsStreamOutputAdapter.prototype._read = function() {
 
 module.exports = NodejsStreamOutputAdapter;
 
-},{"readable-stream":187,"util":11}],137:[function(_dereq_,module,exports){
+},{"readable-stream":163,"util":191}],137:[function(_dereq_,module,exports){
 (function (Buffer){
 'use strict';
 
@@ -10171,7 +9799,7 @@ module.exports = {
 
 }).call(this,_dereq_("buffer").Buffer)
 
-},{"buffer":2}],138:[function(_dereq_,module,exports){
+},{"buffer":5}],138:[function(_dereq_,module,exports){
 'use strict';
 // var utf8 = require('./utf8');
 var utils = _dereq_('./utils');
@@ -11540,7 +11168,7 @@ module.exports = StreamHelper;
 
 }).call(this,_dereq_("buffer").Buffer)
 
-},{"../base64":126,"../external":131,"../nodejs/NodejsStreamOutputAdapter":136,"../utils":154,"./ConvertWorker":146,"./GenericWorker":150,"buffer":2}],152:[function(_dereq_,module,exports){
+},{"../base64":126,"../external":131,"../nodejs/NodejsStreamOutputAdapter":136,"../utils":154,"./ConvertWorker":146,"./GenericWorker":150,"buffer":5}],152:[function(_dereq_,module,exports){
 (function (Buffer){
 'use strict';
 
@@ -11579,7 +11207,7 @@ exports.nodestream = !!_dereq_("./nodejs/NodejsStreamOutputAdapter").prototype;
 
 }).call(this,_dereq_("buffer").Buffer)
 
-},{"./nodejs/NodejsStreamOutputAdapter":136,"buffer":2}],153:[function(_dereq_,module,exports){
+},{"./nodejs/NodejsStreamOutputAdapter":136,"buffer":5}],153:[function(_dereq_,module,exports){
 'use strict';
 
 var utils = _dereq_('./utils');
@@ -12323,7 +11951,7 @@ exports.prepareContent = function(name, inputData, isBinary, isOptimizedBinarySt
     });
 };
 
-},{"./base64":126,"./external":131,"./nodejsUtils":137,"./support":152,"asap":158}],155:[function(_dereq_,module,exports){
+},{"./base64":126,"./external":131,"./nodejsUtils":137,"./support":152,"asap":1}],155:[function(_dereq_,module,exports){
 'use strict';
 var readerFor = _dereq_('./reader/readerFor');
 var utils = _dereq_('./utils');
@@ -13008,8708 +12636,9033 @@ for(var i = 0; i < removedMethods.length; i++) {
 module.exports = ZipObject;
 
 },{"./compressedObject":127,"./stream/DataWorker":149,"./stream/GenericWorker":150,"./stream/StreamHelper":151,"./utf8":153}],158:[function(_dereq_,module,exports){
-"use strict";
+// a duplex stream is just a stream that is both readable and writable.
+// Since JS doesn't have multiple prototypal inheritance, this class
+// prototypally inherits from Readable, and then parasitically from
+// Writable.
 
-// rawAsap provides everything we need except exception management.
-var rawAsap = _dereq_("./raw");
-// RawTasks are recycled to reduce GC churn.
-var freeTasks = [];
-// We queue errors to ensure they are thrown in right order (FIFO).
-// Array-as-queue is good enough here, since we are just dealing with exceptions.
-var pendingErrors = [];
-var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);
+'use strict';
 
-function throwFirstError() {
-    if (pendingErrors.length) {
-        throw pendingErrors.shift();
-    }
-}
+/*<replacement>*/
 
-/**
- * Calls a task as soon as possible after returning, in its own event, with priority
- * over other events like animation, reflow, and repaint. An error thrown from an
- * event will not interrupt, nor even substantially slow down the processing of
- * other events, but will be rather postponed to a lower priority event.
- * @param {{call}} task A callable object, typically a function that takes no
- * arguments.
- */
-module.exports = asap;
-function asap(task) {
-    var rawTask;
-    if (freeTasks.length) {
-        rawTask = freeTasks.pop();
-    } else {
-        rawTask = new RawTask();
-    }
-    rawTask.task = task;
-    rawAsap(rawTask);
-}
+var objectKeys = Object.keys || function (obj) {
+  var keys = [];
+  for (var key in obj) {
+    keys.push(key);
+  }return keys;
+};
+/*</replacement>*/
 
-// We wrap tasks with recyclable task objects.  A task object implements
-// `call`, just like a function.
-function RawTask() {
-    this.task = null;
-}
+module.exports = Duplex;
 
-// The sole purpose of wrapping the task is to catch the exception and recycle
-// the task object after its single use.
-RawTask.prototype.call = function () {
-    try {
-        this.task.call();
-    } catch (error) {
-        if (asap.onerror) {
-            // This hook exists purely for testing purposes.
-            // Its name will be periodically randomized to break any code that
-            // depends on its existence.
-            asap.onerror(error);
-        } else {
-            // In a web browser, exceptions are not fatal. However, to avoid
-            // slowing down the queue of pending tasks, we rethrow the error in a
-            // lower priority turn.
-            pendingErrors.push(error);
-            requestErrorThrow();
-        }
-    } finally {
-        this.task = null;
-        freeTasks[freeTasks.length] = this;
-    }
-};
+/*<replacement>*/
+var processNextTick = _dereq_('process-nextick-args');
+/*</replacement>*/
 
-},{"./raw":159}],159:[function(_dereq_,module,exports){
-(function (global){
-"use strict";
+/*<replacement>*/
+var util = _dereq_('core-util-is');
+util.inherits = _dereq_('inherits');
+/*</replacement>*/
 
-// Use the fastest means possible to execute a task in its own turn, with
-// priority over other events including IO, animation, reflow, and redraw
-// events in browsers.
-//
-// An exception thrown by a task will permanently interrupt the processing of
-// subsequent tasks. The higher level `asap` function ensures that if an
-// exception is thrown by a task, that the task queue will continue flushing as
-// soon as possible, but if you use `rawAsap` directly, you are responsible to
-// either ensure that no exceptions are thrown from your task, or to manually
-// call `rawAsap.requestFlush` if an exception is thrown.
-module.exports = rawAsap;
-function rawAsap(task) {
-    if (!queue.length) {
-        requestFlush();
-        flushing = true;
-    }
-    // Equivalent to push, but avoids a function call.
-    queue[queue.length] = task;
-}
+var Readable = _dereq_('./_stream_readable');
+var Writable = _dereq_('./_stream_writable');
 
-var queue = [];
-// Once a flush has been requested, no further calls to `requestFlush` are
-// necessary until the next `flush` completes.
-var flushing = false;
-// `requestFlush` is an implementation-specific method that attempts to kick
-// off a `flush` event as quickly as possible. `flush` will attempt to exhaust
-// the event queue before yielding to the browser's own event loop.
-var requestFlush;
-// The position of the next task to execute in the task queue. This is
-// preserved between calls to `flush` so that it can be resumed if
-// a task throws an exception.
-var index = 0;
-// If a task schedules additional tasks recursively, the task queue can grow
-// unbounded. To prevent memory exhaustion, the task queue will periodically
-// truncate already-completed tasks.
-var capacity = 1024;
+util.inherits(Duplex, Readable);
 
-// The flush function processes all tasks that have been scheduled with
-// `rawAsap` unless and until one of those tasks throws an exception.
-// If a task throws an exception, `flush` ensures that its state will remain
-// consistent and will resume where it left off when called again.
-// However, `flush` does not make any arrangements to be called again if an
-// exception is thrown.
-function flush() {
-    while (index < queue.length) {
-        var currentIndex = index;
-        // Advance the index before calling the task. This ensures that we will
-        // begin flushing on the next task the task throws an error.
-        index = index + 1;
-        queue[currentIndex].call();
-        // Prevent leaking memory for long chains of recursive calls to `asap`.
-        // If we call `asap` within tasks scheduled by `asap`, the queue will
-        // grow, but to avoid an O(n) walk for every task we execute, we don't
-        // shift tasks off the queue after they have been executed.
-        // Instead, we periodically shift 1024 tasks off the queue.
-        if (index > capacity) {
-            // Manually shift all values starting at the index back to the
-            // beginning of the queue.
-            for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {
-                queue[scan] = queue[scan + index];
-            }
-            queue.length -= index;
-            index = 0;
-        }
-    }
-    queue.length = 0;
-    index = 0;
-    flushing = false;
+var keys = objectKeys(Writable.prototype);
+for (var v = 0; v < keys.length; v++) {
+  var method = keys[v];
+  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
 }
 
-// `requestFlush` is implemented using a strategy based on data collected from
-// every available SauceLabs Selenium web driver worker at time of writing.
-// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593
-
-// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
-// have WebKitMutationObserver but not un-prefixed MutationObserver.
-// Must use `global` or `self` instead of `window` to work in both frames and web
-// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.
+function Duplex(options) {
+  if (!(this instanceof Duplex)) return new Duplex(options);
 
-/* globals self */
-var scope = typeof global !== "undefined" ? global : self;
-var BrowserMutationObserver = scope.MutationObserver || scope.WebKitMutationObserver;
+  Readable.call(this, options);
+  Writable.call(this, options);
 
-// MutationObservers are desirable because they have high priority and work
-// reliably everywhere they are implemented.
-// They are implemented in all modern browsers.
-//
-// - Android 4-4.3
-// - Chrome 26-34
-// - Firefox 14-29
-// - Internet Explorer 11
-// - iPad Safari 6-7.1
-// - iPhone Safari 7-7.1
-// - Safari 6-7
-if (typeof BrowserMutationObserver === "function") {
-    requestFlush = makeRequestCallFromMutationObserver(flush);
+  if (options && options.readable === false) this.readable = false;
 
-// MessageChannels are desirable because they give direct access to the HTML
-// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
-// 11-12, and in web workers in many engines.
-// Although message channels yield to any queued rendering and IO tasks, they
-// would be better than imposing the 4ms delay of timers.
-// However, they do not work reliably in Internet Explorer or Safari.
+  if (options && options.writable === false) this.writable = false;
 
-// Internet Explorer 10 is the only browser that has setImmediate but does
-// not have MutationObservers.
-// Although setImmediate yields to the browser's renderer, it would be
-// preferrable to falling back to setTimeout since it does not have
-// the minimum 4ms penalty.
-// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
-// Desktop to a lesser extent) that renders both setImmediate and
-// MessageChannel useless for the purposes of ASAP.
-// https://github.com/kriskowal/q/issues/396
+  this.allowHalfOpen = true;
+  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
 
-// Timers are implemented universally.
-// We fall back to timers in workers in most engines, and in foreground
-// contexts in the following browsers.
-// However, note that even this simple case requires nuances to operate in a
-// broad spectrum of browsers.
-//
-// - Firefox 3-13
-// - Internet Explorer 6-9
-// - iPad Safari 4.3
-// - Lynx 2.8.7
-} else {
-    requestFlush = makeRequestCallFromTimer(flush);
+  this.once('end', onend);
 }
 
-// `requestFlush` requests that the high priority event queue be flushed as
-// soon as possible.
-// This is useful to prevent an error thrown in a task from stalling the event
-// queue if the exception handled by Node.js’s
-// `process.on("uncaughtException")` or by a domain.
-rawAsap.requestFlush = requestFlush;
+// the no-half-open enforcer
+function onend() {
+  // if we allow half-open state, or if the writable side ended,
+  // then we're ok.
+  if (this.allowHalfOpen || this._writableState.ended) return;
 
-// To request a high priority event, we induce a mutation observer by toggling
-// the text of a text node between "1" and "-1".
-function makeRequestCallFromMutationObserver(callback) {
-    var toggle = 1;
-    var observer = new BrowserMutationObserver(callback);
-    var node = document.createTextNode("");
-    observer.observe(node, {characterData: true});
-    return function requestCall() {
-        toggle = -toggle;
-        node.data = toggle;
-    };
+  // no more data can be written.
+  // But allow more writes to happen in this tick.
+  processNextTick(onEndNT, this);
 }
 
-// The message channel technique was discovered by Malte Ubl and was the
-// original foundation for this library.
-// http://www.nonblocking.io/2011/06/windownexttick.html
+function onEndNT(self) {
+  self.end();
+}
 
-// Safari 6.0.5 (at least) intermittently fails to create message ports on a
-// page's first load. Thankfully, this version of Safari supports
-// MutationObservers, so we don't need to fall back in that case.
+function forEach(xs, f) {
+  for (var i = 0, l = xs.length; i < l; i++) {
+    f(xs[i], i);
+  }
+}
+},{"./_stream_readable":160,"./_stream_writable":162,"core-util-is":70,"inherits":94,"process-nextick-args":183}],159:[function(_dereq_,module,exports){
+// a passthrough stream.
+// basically just the most minimal sort of Transform stream.
+// Every written chunk gets output as-is.
 
-// function makeRequestCallFromMessageChannel(callback) {
-//     var channel = new MessageChannel();
-//     channel.port1.onmessage = callback;
-//     return function requestCall() {
-//         channel.port2.postMessage(0);
-//     };
-// }
+'use strict';
 
-// For reasons explained above, we are also unable to use `setImmediate`
-// under any circumstances.
-// Even if we were, there is another bug in Internet Explorer 10.
-// It is not sufficient to assign `setImmediate` to `requestFlush` because
-// `setImmediate` must be called *by name* and therefore must be wrapped in a
-// closure.
-// Never forget.
+module.exports = PassThrough;
 
-// function makeRequestCallFromSetImmediate(callback) {
-//     return function requestCall() {
-//         setImmediate(callback);
-//     };
-// }
+var Transform = _dereq_('./_stream_transform');
 
-// Safari 6.0 has a problem where timers will get lost while the user is
-// scrolling. This problem does not impact ASAP because Safari 6.0 supports
-// mutation observers, so that implementation is used instead.
-// However, if we ever elect to use timers in Safari, the prevalent work-around
-// is to add a scroll event listener that calls for a flush.
+/*<replacement>*/
+var util = _dereq_('core-util-is');
+util.inherits = _dereq_('inherits');
+/*</replacement>*/
 
-// `setTimeout` does not call the passed callback if the delay is less than
-// approximately 7 in web workers in Firefox 8 through 18, and sometimes not
-// even then.
+util.inherits(PassThrough, Transform);
 
-function makeRequestCallFromTimer(callback) {
-    return function requestCall() {
-        // We dispatch a timeout with a specified delay of 0 for engines that
-        // can reliably accommodate that request. This will usually be snapped
-        // to a 4 milisecond delay, but once we're flushing, there's no delay
-        // between events.
-        var timeoutHandle = setTimeout(handleTimer, 0);
-        // However, since this timer gets frequently dropped in Firefox
-        // workers, we enlist an interval handle that will try to fire
-        // an event 20 times per second until it succeeds.
-        var intervalHandle = setInterval(handleTimer, 50);
+function PassThrough(options) {
+  if (!(this instanceof PassThrough)) return new PassThrough(options);
 
-        function handleTimer() {
-            // Whichever timer succeeds will cancel both timers and
-            // execute the callback.
-            clearTimeout(timeoutHandle);
-            clearInterval(intervalHandle);
-            callback();
-        }
-    };
+  Transform.call(this, options);
 }
 
-// This is for `asap.js` only.
-// Its name will be periodically randomized to break any code that depends on
-// its existence.
-rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;
-
-// ASAP was originally a nextTick shim included in Q. This was factored out
-// into this ASAP package. It was later adapted to RSVP which made further
-// amendments. These decisions, particularly to marginalize MessageChannel and
-// to capture the MutationObserver implementation in a closure, were integrated
-// back into ASAP proper.
-// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js
-
-}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-
-},{}],160:[function(_dereq_,module,exports){
-// Top level file is just a mixin of submodules & constants
+PassThrough.prototype._transform = function (chunk, encoding, cb) {
+  cb(null, chunk);
+};
+},{"./_stream_transform":161,"core-util-is":70,"inherits":94}],160:[function(_dereq_,module,exports){
+(function (process){
 'use strict';
 
-var assign    = _dereq_('./lib/utils/common').assign;
-
-var deflate   = _dereq_('./lib/deflate');
-var inflate   = _dereq_('./lib/inflate');
-var constants = _dereq_('./lib/zlib/constants');
+module.exports = Readable;
 
-var pako = {};
+/*<replacement>*/
+var processNextTick = _dereq_('process-nextick-args');
+/*</replacement>*/
 
-assign(pako, deflate, inflate, constants);
+/*<replacement>*/
+var isArray = _dereq_('isarray');
+/*</replacement>*/
 
-module.exports = pako;
+/*<replacement>*/
+var Buffer = _dereq_('buffer').Buffer;
+/*</replacement>*/
 
-},{"./lib/deflate":161,"./lib/inflate":162,"./lib/utils/common":163,"./lib/zlib/constants":166}],161:[function(_dereq_,module,exports){
-'use strict';
+Readable.ReadableState = ReadableState;
 
+var EE = _dereq_('events');
 
-var zlib_deflate = _dereq_('./zlib/deflate');
-var utils        = _dereq_('./utils/common');
-var strings      = _dereq_('./utils/strings');
-var msg          = _dereq_('./zlib/messages');
-var ZStream      = _dereq_('./zlib/zstream');
+/*<replacement>*/
+var EElistenerCount = function (emitter, type) {
+  return emitter.listeners(type).length;
+};
+/*</replacement>*/
 
-var toString = Object.prototype.toString;
+/*<replacement>*/
+var Stream;
+(function () {
+  try {
+    Stream = _dereq_('st' + 'ream');
+  } catch (_) {} finally {
+    if (!Stream) Stream = _dereq_('events').EventEmitter;
+  }
+})();
+/*</replacement>*/
 
-/* Public constants ==========================================================*/
-/* ===========================================================================*/
+var Buffer = _dereq_('buffer').Buffer;
 
-var Z_NO_FLUSH      = 0;
-var Z_FINISH        = 4;
+/*<replacement>*/
+var util = _dereq_('core-util-is');
+util.inherits = _dereq_('inherits');
+/*</replacement>*/
 
-var Z_OK            = 0;
-var Z_STREAM_END    = 1;
-var Z_SYNC_FLUSH    = 2;
+/*<replacement>*/
+var debugUtil = _dereq_('util');
+var debug = undefined;
+if (debugUtil && debugUtil.debuglog) {
+  debug = debugUtil.debuglog('stream');
+} else {
+  debug = function () {};
+}
+/*</replacement>*/
 
-var Z_DEFAULT_COMPRESSION = -1;
+var StringDecoder;
 
-var Z_DEFAULT_STRATEGY    = 0;
+util.inherits(Readable, Stream);
 
-var Z_DEFLATED  = 8;
+var Duplex;
+function ReadableState(options, stream) {
+  Duplex = Duplex || _dereq_('./_stream_duplex');
 
-/* ===========================================================================*/
+  options = options || {};
 
+  // object stream flag. Used to make read(n) ignore n and to
+  // make all the buffer merging and length checks go away
+  this.objectMode = !!options.objectMode;
 
-/**
- * class Deflate
- *
- * Generic JS-style wrapper for zlib calls. If you don't need
- * streaming behaviour - use more simple functions: [[deflate]],
- * [[deflateRaw]] and [[gzip]].
- **/
+  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
 
-/* internal
- * Deflate.chunks -> Array
- *
- * Chunks of output data, if [[Deflate#onData]] not overriden.
- **/
+  // the point at which it stops calling _read() to fill the buffer
+  // Note: 0 is a valid value, means "don't call _read preemptively ever"
+  var hwm = options.highWaterMark;
+  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
+  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
 
-/**
- * Deflate.result -> Uint8Array|Array
- *
- * Compressed result, generated by default [[Deflate#onData]]
- * and [[Deflate#onEnd]] handlers. Filled after you push last chunk
- * (call [[Deflate#push]] with `Z_FINISH` / `true` param)  or if you
- * push a chunk with explicit flush (call [[Deflate#push]] with
- * `Z_SYNC_FLUSH` param).
- **/
+  // cast to ints.
+  this.highWaterMark = ~ ~this.highWaterMark;
 
-/**
- * Deflate.err -> Number
- *
- * Error code after deflate finished. 0 (Z_OK) on success.
- * You will not need it in real life, because deflate errors
- * are possible only on wrong options or bad `onData` / `onEnd`
- * custom handlers.
- **/
+  this.buffer = [];
+  this.length = 0;
+  this.pipes = null;
+  this.pipesCount = 0;
+  this.flowing = null;
+  this.ended = false;
+  this.endEmitted = false;
+  this.reading = false;
 
-/**
- * Deflate.msg -> String
- *
- * Error message, if [[Deflate.err]] != 0
- **/
+  // a flag to be able to tell if the onwrite cb is called immediately,
+  // or on a later tick.  We set this to true at first, because any
+  // actions that shouldn't happen until "later" should generally also
+  // not happen before the first write call.
+  this.sync = true;
 
+  // whenever we return null, then we set a flag to say
+  // that we're awaiting a 'readable' event emission.
+  this.needReadable = false;
+  this.emittedReadable = false;
+  this.readableListening = false;
+  this.resumeScheduled = false;
 
-/**
- * new Deflate(options)
- * - options (Object): zlib deflate options.
- *
- * Creates new deflator instance with specified params. Throws exception
- * on bad params. Supported options:
- *
- * - `level`
- * - `windowBits`
- * - `memLevel`
- * - `strategy`
- * - `dictionary`
- *
- * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
- * for more information on these.
- *
- * Additional options, for internal needs:
- *
- * - `chunkSize` - size of generated data chunks (16K by default)
- * - `raw` (Boolean) - do raw deflate
- * - `gzip` (Boolean) - create gzip wrapper
- * - `to` (String) - if equal to 'string', then result will be "binary string"
- *    (each char code [0..255])
- * - `header` (Object) - custom header for gzip
- *   - `text` (Boolean) - true if compressed data believed to be text
- *   - `time` (Number) - modification time, unix timestamp
- *   - `os` (Number) - operation system code
- *   - `extra` (Array) - array of bytes with extra data (max 65536)
- *   - `name` (String) - file name (binary string)
- *   - `comment` (String) - comment (binary string)
- *   - `hcrc` (Boolean) - true if header crc should be added
- *
- * ##### Example:
- *
- * ```javascript
- * var pako = require('pako')
- *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])
- *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);
- *
- * var deflate = new pako.Deflate({ level: 3});
- *
- * deflate.push(chunk1, false);
- * deflate.push(chunk2, true);  // true -> last chunk
- *
- * if (deflate.err) { throw new Error(deflate.err); }
- *
- * console.log(deflate.result);
- * ```
- **/
-function Deflate(options) {
-  if (!(this instanceof Deflate)) return new Deflate(options);
+  // Crypto is kind of old and crusty.  Historically, its default string
+  // encoding is 'binary' so we have to make this configurable.
+  // Everything else in the universe uses 'utf8', though.
+  this.defaultEncoding = options.defaultEncoding || 'utf8';
 
-  this.options = utils.assign({
-    level: Z_DEFAULT_COMPRESSION,
-    method: Z_DEFLATED,
-    chunkSize: 16384,
-    windowBits: 15,
-    memLevel: 8,
-    strategy: Z_DEFAULT_STRATEGY,
-    to: ''
-  }, options || {});
+  // when piping, we only care about 'readable' events that happen
+  // after read()ing all the bytes and not getting any pushback.
+  this.ranOut = false;
 
-  var opt = this.options;
+  // the number of writers that are awaiting a drain event in .pipe()s
+  this.awaitDrain = 0;
 
-  if (opt.raw && (opt.windowBits > 0)) {
-    opt.windowBits = -opt.windowBits;
-  }
+  // if true, a maybeReadMore has been scheduled
+  this.readingMore = false;
 
-  else if (opt.gzip && (opt.windowBits > 0) && (opt.windowBits < 16)) {
-    opt.windowBits += 16;
+  this.decoder = null;
+  this.encoding = null;
+  if (options.encoding) {
+    if (!StringDecoder) StringDecoder = _dereq_('string_decoder/').StringDecoder;
+    this.decoder = new StringDecoder(options.encoding);
+    this.encoding = options.encoding;
   }
+}
 
-  this.err    = 0;      // error code, if happens (0 = Z_OK)
-  this.msg    = '';     // error message
-  this.ended  = false;  // used to avoid multiple onEnd() calls
-  this.chunks = [];     // chunks of compressed data
+var Duplex;
+function Readable(options) {
+  Duplex = Duplex || _dereq_('./_stream_duplex');
 
-  this.strm = new ZStream();
-  this.strm.avail_out = 0;
+  if (!(this instanceof Readable)) return new Readable(options);
 
-  var status = zlib_deflate.deflateInit2(
-    this.strm,
-    opt.level,
-    opt.method,
-    opt.windowBits,
-    opt.memLevel,
-    opt.strategy
-  );
+  this._readableState = new ReadableState(options, this);
 
-  if (status !== Z_OK) {
-    throw new Error(msg[status]);
-  }
+  // legacy
+  this.readable = true;
 
-  if (opt.header) {
-    zlib_deflate.deflateSetHeader(this.strm, opt.header);
-  }
+  if (options && typeof options.read === 'function') this._read = options.read;
 
-  if (opt.dictionary) {
-    var dict;
-    // Convert data if needed
-    if (typeof opt.dictionary === 'string') {
-      // If we need to compress text, change encoding to utf8.
-      dict = strings.string2buf(opt.dictionary);
-    } else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {
-      dict = new Uint8Array(opt.dictionary);
-    } else {
-      dict = opt.dictionary;
-    }
+  Stream.call(this);
+}
 
-    status = zlib_deflate.deflateSetDictionary(this.strm, dict);
+// Manually shove something into the read() buffer.
+// This returns true if the highWaterMark has not been hit yet,
+// similar to how Writable.write() returns true if you should
+// write() some more.
+Readable.prototype.push = function (chunk, encoding) {
+  var state = this._readableState;
 
-    if (status !== Z_OK) {
-      throw new Error(msg[status]);
+  if (!state.objectMode && typeof chunk === 'string') {
+    encoding = encoding || state.defaultEncoding;
+    if (encoding !== state.encoding) {
+      chunk = new Buffer(chunk, encoding);
+      encoding = '';
     }
-
-    this._dict_set = true;
   }
-}
 
-/**
- * Deflate#push(data[, mode]) -> Boolean
- * - data (Uint8Array|Array|ArrayBuffer|String): input data. Strings will be
- *   converted to utf8 byte sequence.
- * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.
- *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.
- *
- * Sends input data to deflate pipe, generating [[Deflate#onData]] calls with
- * new compressed chunks. Returns `true` on success. The last data block must have
- * mode Z_FINISH (or `true`). That will flush internal pending buffers and call
- * [[Deflate#onEnd]]. For interim explicit flushes (without ending the stream) you
- * can use mode Z_SYNC_FLUSH, keeping the compression context.
- *
- * On fail call [[Deflate#onEnd]] with error code and return false.
- *
- * We strongly recommend to use `Uint8Array` on input for best speed (output
- * array format is detected automatically). Also, don't skip last param and always
- * use the same type in your code (boolean or number). That will improve JS speed.
- *
- * For regular `Array`-s make sure all elements are [0..255].
- *
- * ##### Example
- *
- * ```javascript
- * push(chunk, false); // push one of data chunks
- * ...
- * push(chunk, true);  // push last chunk
- * ```
- **/
-Deflate.prototype.push = function (data, mode) {
-  var strm = this.strm;
-  var chunkSize = this.options.chunkSize;
-  var status, _mode;
+  return readableAddChunk(this, state, chunk, encoding, false);
+};
 
-  if (this.ended) { return false; }
+// Unshift should *always* be something directly out of read()
+Readable.prototype.unshift = function (chunk) {
+  var state = this._readableState;
+  return readableAddChunk(this, state, chunk, '', true);
+};
 
-  _mode = (mode === ~~mode) ? mode : ((mode === true) ? Z_FINISH : Z_NO_FLUSH);
+Readable.prototype.isPaused = function () {
+  return this._readableState.flowing === false;
+};
 
-  // Convert data if needed
-  if (typeof data === 'string') {
-    // If we need to compress text, change encoding to utf8.
-    strm.input = strings.string2buf(data);
-  } else if (toString.call(data) === '[object ArrayBuffer]') {
-    strm.input = new Uint8Array(data);
-  } else {
-    strm.input = data;
-  }
+function readableAddChunk(stream, state, chunk, encoding, addToFront) {
+  var er = chunkInvalid(state, chunk);
+  if (er) {
+    stream.emit('error', er);
+  } else if (chunk === null) {
+    state.reading = false;
+    onEofChunk(stream, state);
+  } else if (state.objectMode || chunk && chunk.length > 0) {
+    if (state.ended && !addToFront) {
+      var e = new Error('stream.push() after EOF');
+      stream.emit('error', e);
+    } else if (state.endEmitted && addToFront) {
+      var e = new Error('stream.unshift() after end event');
+      stream.emit('error', e);
+    } else {
+      var skipAdd;
+      if (state.decoder && !addToFront && !encoding) {
+        chunk = state.decoder.write(chunk);
+        skipAdd = !state.objectMode && chunk.length === 0;
+      }
 
-  strm.next_in = 0;
-  strm.avail_in = strm.input.length;
+      if (!addToFront) state.reading = false;
 
-  do {
-    if (strm.avail_out === 0) {
-      strm.output = new utils.Buf8(chunkSize);
-      strm.next_out = 0;
-      strm.avail_out = chunkSize;
-    }
-    status = zlib_deflate.deflate(strm, _mode);    /* no bad return value */
+      // Don't add to the buffer if we've decoded to an empty string chunk and
+      // we're not in object mode
+      if (!skipAdd) {
+        // if we want the data now, just emit it.
+        if (state.flowing && state.length === 0 && !state.sync) {
+          stream.emit('data', chunk);
+          stream.read(0);
+        } else {
+          // update the buffer info.
+          state.length += state.objectMode ? 1 : chunk.length;
+          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
 
-    if (status !== Z_STREAM_END && status !== Z_OK) {
-      this.onEnd(status);
-      this.ended = true;
-      return false;
-    }
-    if (strm.avail_out === 0 || (strm.avail_in === 0 && (_mode === Z_FINISH || _mode === Z_SYNC_FLUSH))) {
-      if (this.options.to === 'string') {
-        this.onData(strings.buf2binstring(utils.shrinkBuf(strm.output, strm.next_out)));
-      } else {
-        this.onData(utils.shrinkBuf(strm.output, strm.next_out));
+          if (state.needReadable) emitReadable(stream);
+        }
       }
-    }
-  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== Z_STREAM_END);
-
-  // Finalize on the last chunk.
-  if (_mode === Z_FINISH) {
-    status = zlib_deflate.deflateEnd(this.strm);
-    this.onEnd(status);
-    this.ended = true;
-    return status === Z_OK;
-  }
 
-  // callback interim results if Z_SYNC_FLUSH.
-  if (_mode === Z_SYNC_FLUSH) {
-    this.onEnd(Z_OK);
-    strm.avail_out = 0;
-    return true;
+      maybeReadMore(stream, state);
+    }
+  } else if (!addToFront) {
+    state.reading = false;
   }
 
-  return true;
-};
+  return needMoreData(state);
+}
 
+// if it's past the high water mark, we can push in some more.
+// Also, if we have no data yet, we can stand some
+// more bytes.  This is to work around cases where hwm=0,
+// such as the repl.  Also, if the push() triggered a
+// readable event, and the user called read(largeNumber) such that
+// needReadable was set, then we ought to push more, so that another
+// 'readable' event will be triggered.
+function needMoreData(state) {
+  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
+}
 
-/**
- * Deflate#onData(chunk) -> Void
- * - chunk (Uint8Array|Array|String): ouput data. Type of array depends
- *   on js engine support. When string output requested, each chunk
- *   will be string.
- *
- * By default, stores data blocks in `chunks[]` property and glue
- * those in `onEnd`. Override this handler, if you need another behaviour.
- **/
-Deflate.prototype.onData = function (chunk) {
-  this.chunks.push(chunk);
+// backwards compatibility.
+Readable.prototype.setEncoding = function (enc) {
+  if (!StringDecoder) StringDecoder = _dereq_('string_decoder/').StringDecoder;
+  this._readableState.decoder = new StringDecoder(enc);
+  this._readableState.encoding = enc;
+  return this;
 };
 
-
-/**
- * Deflate#onEnd(status) -> Void
- * - status (Number): deflate status. 0 (Z_OK) on success,
- *   other if not.
- *
- * Called once after you tell deflate that the input stream is
- * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)
- * or if an error happened. By default - join collected chunks,
- * free memory and fill `results` / `err` properties.
- **/
-Deflate.prototype.onEnd = function (status) {
-  // On success - join
-  if (status === Z_OK) {
-    if (this.options.to === 'string') {
-      this.result = this.chunks.join('');
-    } else {
-      this.result = utils.flattenChunks(this.chunks);
-    }
+// Don't raise the hwm > 8MB
+var MAX_HWM = 0x800000;
+function computeNewHighWaterMark(n) {
+  if (n >= MAX_HWM) {
+    n = MAX_HWM;
+  } else {
+    // Get the next highest power of 2
+    n--;
+    n |= n >>> 1;
+    n |= n >>> 2;
+    n |= n >>> 4;
+    n |= n >>> 8;
+    n |= n >>> 16;
+    n++;
   }
-  this.chunks = [];
-  this.err = status;
-  this.msg = this.strm.msg;
-};
-
+  return n;
+}
 
-/**
- * deflate(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to compress.
- * - options (Object): zlib deflate options.
- *
- * Compress `data` with deflate algorithm and `options`.
- *
- * Supported options are:
- *
- * - level
- * - windowBits
- * - memLevel
- * - strategy
- * - dictionary
- *
- * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
- * for more information on these.
- *
- * Sugar (options):
- *
- * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify
- *   negative windowBits implicitly.
- * - `to` (String) - if equal to 'string', then result will be "binary string"
- *    (each char code [0..255])
- *
- * ##### Example:
- *
- * ```javascript
- * var pako = require('pako')
- *   , data = Uint8Array([1,2,3,4,5,6,7,8,9]);
- *
- * console.log(pako.deflate(data));
- * ```
- **/
-function deflate(input, options) {
-  var deflator = new Deflate(options);
+function howMuchToRead(n, state) {
+  if (state.length === 0 && state.ended) return 0;
 
-  deflator.push(input, true);
+  if (state.objectMode) return n === 0 ? 0 : 1;
 
-  // That will never happens, if you don't cheat with options :)
-  if (deflator.err) { throw deflator.msg || msg[deflator.err]; }
+  if (n === null || isNaN(n)) {
+    // only flow one buffer at a time
+    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
+  }
 
-  return deflator.result;
-}
+  if (n <= 0) return 0;
 
+  // If we're asking for more than the target buffer level,
+  // then raise the water mark.  Bump up to the next highest
+  // power of 2, to prevent increasing it excessively in tiny
+  // amounts.
+  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
 
-/**
- * deflateRaw(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to compress.
- * - options (Object): zlib deflate options.
- *
- * The same as [[deflate]], but creates raw data, without wrapper
- * (header and adler32 crc).
- **/
-function deflateRaw(input, options) {
-  options = options || {};
-  options.raw = true;
-  return deflate(input, options);
+  // don't have that much.  return null, unless we've ended.
+  if (n > state.length) {
+    if (!state.ended) {
+      state.needReadable = true;
+      return 0;
+    } else {
+      return state.length;
+    }
+  }
+
+  return n;
 }
 
+// you can override either this method, or the async _read(n) below.
+Readable.prototype.read = function (n) {
+  debug('read', n);
+  var state = this._readableState;
+  var nOrig = n;
 
-/**
- * gzip(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to compress.
- * - options (Object): zlib deflate options.
- *
- * The same as [[deflate]], but create gzip wrapper instead of
- * deflate one.
- **/
-function gzip(input, options) {
-  options = options || {};
-  options.gzip = true;
-  return deflate(input, options);
-}
+  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;
 
+  // if we're doing read(0) to trigger a readable event, but we
+  // already have a bunch of data in the buffer, then just trigger
+  // the 'readable' event and move on.
+  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
+    debug('read: emitReadable', state.length, state.ended);
+    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
+    return null;
+  }
 
-exports.Deflate = Deflate;
-exports.deflate = deflate;
-exports.deflateRaw = deflateRaw;
-exports.gzip = gzip;
+  n = howMuchToRead(n, state);
 
-},{"./utils/common":163,"./utils/strings":164,"./zlib/deflate":168,"./zlib/messages":173,"./zlib/zstream":175}],162:[function(_dereq_,module,exports){
-'use strict';
+  // if we've ended, and we're now clear, then finish it up.
+  if (n === 0 && state.ended) {
+    if (state.length === 0) endReadable(this);
+    return null;
+  }
 
+  // All the actual chunk generation logic needs to be
+  // *below* the call to _read.  The reason is that in certain
+  // synthetic stream cases, such as passthrough streams, _read
+  // may be a completely synchronous operation which may change
+  // the state of the read buffer, providing enough data when
+  // before there was *not* enough.
+  //
+  // So, the steps are:
+  // 1. Figure out what the state of things will be after we do
+  // a read from the buffer.
+  //
+  // 2. If that resulting state will trigger a _read, then call _read.
+  // Note that this may be asynchronous, or synchronous.  Yes, it is
+  // deeply ugly to write APIs this way, but that still doesn't mean
+  // that the Readable class should behave improperly, as streams are
+  // designed to be sync/async agnostic.
+  // Take note if the _read call is sync or async (ie, if the read call
+  // has returned yet), so that we know whether or not it's safe to emit
+  // 'readable' etc.
+  //
+  // 3. Actually pull the requested chunks out of the buffer and return.
 
-var zlib_inflate = _dereq_('./zlib/inflate');
-var utils        = _dereq_('./utils/common');
-var strings      = _dereq_('./utils/strings');
-var c            = _dereq_('./zlib/constants');
-var msg          = _dereq_('./zlib/messages');
-var ZStream      = _dereq_('./zlib/zstream');
-var GZheader     = _dereq_('./zlib/gzheader');
+  // if we need a readable event, then we need to do some reading.
+  var doRead = state.needReadable;
+  debug('need readable', doRead);
 
-var toString = Object.prototype.toString;
+  // if we currently have less than the highWaterMark, then also read some
+  if (state.length === 0 || state.length - n < state.highWaterMark) {
+    doRead = true;
+    debug('length less than watermark', doRead);
+  }
 
-/**
- * class Inflate
- *
- * Generic JS-style wrapper for zlib calls. If you don't need
- * streaming behaviour - use more simple functions: [[inflate]]
- * and [[inflateRaw]].
- **/
+  // however, if we've ended, then there's no point, and if we're already
+  // reading, then it's unnecessary.
+  if (state.ended || state.reading) {
+    doRead = false;
+    debug('reading or ended', doRead);
+  }
 
-/* internal
- * inflate.chunks -> Array
- *
- * Chunks of output data, if [[Inflate#onData]] not overriden.
- **/
+  if (doRead) {
+    debug('do read');
+    state.reading = true;
+    state.sync = true;
+    // if the length is currently zero, then we *need* a readable event.
+    if (state.length === 0) state.needReadable = true;
+    // call internal read method
+    this._read(state.highWaterMark);
+    state.sync = false;
+  }
 
-/**
- * Inflate.result -> Uint8Array|Array|String
- *
- * Uncompressed result, generated by default [[Inflate#onData]]
- * and [[Inflate#onEnd]] handlers. Filled after you push last chunk
- * (call [[Inflate#push]] with `Z_FINISH` / `true` param) or if you
- * push a chunk with explicit flush (call [[Inflate#push]] with
- * `Z_SYNC_FLUSH` param).
- **/
+  // If _read pushed data synchronously, then `reading` will be false,
+  // and we need to re-evaluate how much data we can return to the user.
+  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);
 
-/**
- * Inflate.err -> Number
- *
- * Error code after inflate finished. 0 (Z_OK) on success.
- * Should be checked if broken data possible.
- **/
+  var ret;
+  if (n > 0) ret = fromList(n, state);else ret = null;
 
-/**
- * Inflate.msg -> String
- *
- * Error message, if [[Inflate.err]] != 0
- **/
+  if (ret === null) {
+    state.needReadable = true;
+    n = 0;
+  }
 
+  state.length -= n;
 
-/**
- * new Inflate(options)
- * - options (Object): zlib inflate options.
- *
- * Creates new inflator instance with specified params. Throws exception
- * on bad params. Supported options:
- *
- * - `windowBits`
- * - `dictionary`
- *
- * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
- * for more information on these.
- *
- * Additional options, for internal needs:
- *
- * - `chunkSize` - size of generated data chunks (16K by default)
- * - `raw` (Boolean) - do raw inflate
- * - `to` (String) - if equal to 'string', then result will be converted
- *   from utf8 to utf16 (javascript) string. When string output requested,
- *   chunk length can differ from `chunkSize`, depending on content.
- *
- * By default, when no options set, autodetect deflate/gzip data format via
- * wrapper header.
- *
- * ##### Example:
- *
- * ```javascript
- * var pako = require('pako')
- *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])
- *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);
- *
- * var inflate = new pako.Inflate({ level: 3});
- *
- * inflate.push(chunk1, false);
- * inflate.push(chunk2, true);  // true -> last chunk
- *
- * if (inflate.err) { throw new Error(inflate.err); }
- *
- * console.log(inflate.result);
- * ```
- **/
-function Inflate(options) {
-  if (!(this instanceof Inflate)) return new Inflate(options);
+  // If we have nothing in the buffer, then we want to know
+  // as soon as we *do* get something into the buffer.
+  if (state.length === 0 && !state.ended) state.needReadable = true;
 
-  this.options = utils.assign({
-    chunkSize: 16384,
-    windowBits: 0,
-    to: ''
-  }, options || {});
+  // If we tried to read() past the EOF, then emit end on the next tick.
+  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);
 
-  var opt = this.options;
+  if (ret !== null) this.emit('data', ret);
 
-  // Force window size for `raw` data, if not set directly,
-  // because we have no header for autodetect.
-  if (opt.raw && (opt.windowBits >= 0) && (opt.windowBits < 16)) {
-    opt.windowBits = -opt.windowBits;
-    if (opt.windowBits === 0) { opt.windowBits = -15; }
-  }
+  return ret;
+};
 
-  // If `windowBits` not defined (and mode not raw) - set autodetect flag for gzip/deflate
-  if ((opt.windowBits >= 0) && (opt.windowBits < 16) &&
-      !(options && options.windowBits)) {
-    opt.windowBits += 32;
+function chunkInvalid(state, chunk) {
+  var er = null;
+  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
+    er = new TypeError('Invalid non-string/buffer chunk');
   }
+  return er;
+}
 
-  // Gzip header has no info about windows size, we can do autodetect only
-  // for deflate. So, if window size not set, force it to max when gzip possible
-  if ((opt.windowBits > 15) && (opt.windowBits < 48)) {
-    // bit 3 (16) -> gzipped data
-    // bit 4 (32) -> autodetect gzip/deflate
-    if ((opt.windowBits & 15) === 0) {
-      opt.windowBits |= 15;
+function onEofChunk(stream, state) {
+  if (state.ended) return;
+  if (state.decoder) {
+    var chunk = state.decoder.end();
+    if (chunk && chunk.length) {
+      state.buffer.push(chunk);
+      state.length += state.objectMode ? 1 : chunk.length;
     }
   }
+  state.ended = true;
 
-  this.err    = 0;      // error code, if happens (0 = Z_OK)
-  this.msg    = '';     // error message
-  this.ended  = false;  // used to avoid multiple onEnd() calls
-  this.chunks = [];     // chunks of compressed data
-
-  this.strm   = new ZStream();
-  this.strm.avail_out = 0;
-
-  var status  = zlib_inflate.inflateInit2(
-    this.strm,
-    opt.windowBits
-  );
+  // emit 'readable' now to make sure it gets picked up.
+  emitReadable(stream);
+}
 
-  if (status !== c.Z_OK) {
-    throw new Error(msg[status]);
+// Don't emit readable right away in sync mode, because this can trigger
+// another read() call => stack overflow.  This way, it might trigger
+// a nextTick recursion warning, but that's not so bad.
+function emitReadable(stream) {
+  var state = stream._readableState;
+  state.needReadable = false;
+  if (!state.emittedReadable) {
+    debug('emitReadable', state.flowing);
+    state.emittedReadable = true;
+    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
   }
+}
 
-  this.header = new GZheader();
+function emitReadable_(stream) {
+  debug('emit readable');
+  stream.emit('readable');
+  flow(stream);
+}
 
-  zlib_inflate.inflateGetHeader(this.strm, this.header);
+// at this point, the user has presumably seen the 'readable' event,
+// and called read() to consume some data.  that may have triggered
+// in turn another _read(n) call, in which case reading = true if
+// it's in progress.
+// However, if we're not ended, or reading, and the length < hwm,
+// then go ahead and try to read some more preemptively.
+function maybeReadMore(stream, state) {
+  if (!state.readingMore) {
+    state.readingMore = true;
+    processNextTick(maybeReadMore_, stream, state);
+  }
 }
 
-/**
- * Inflate#push(data[, mode]) -> Boolean
- * - data (Uint8Array|Array|ArrayBuffer|String): input data
- * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.
- *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.
- *
- * Sends input data to inflate pipe, generating [[Inflate#onData]] calls with
- * new output chunks. Returns `true` on success. The last data block must have
- * mode Z_FINISH (or `true`). That will flush internal pending buffers and call
- * [[Inflate#onEnd]]. For interim explicit flushes (without ending the stream) you
- * can use mode Z_SYNC_FLUSH, keeping the decompression context.
- *
- * On fail call [[Inflate#onEnd]] with error code and return false.
- *
- * We strongly recommend to use `Uint8Array` on input for best speed (output
- * format is detected automatically). Also, don't skip last param and always
- * use the same type in your code (boolean or number). That will improve JS speed.
- *
- * For regular `Array`-s make sure all elements are [0..255].
- *
- * ##### Example
- *
- * ```javascript
- * push(chunk, false); // push one of data chunks
- * ...
- * push(chunk, true);  // push last chunk
- * ```
- **/
-Inflate.prototype.push = function (data, mode) {
-  var strm = this.strm;
-  var chunkSize = this.options.chunkSize;
-  var dictionary = this.options.dictionary;
-  var status, _mode;
-  var next_out_utf8, tail, utf8str;
-  var dict;
+function maybeReadMore_(stream, state) {
+  var len = state.length;
+  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
+    debug('maybeReadMore read 0');
+    stream.read(0);
+    if (len === state.length)
+      // didn't get any data, stop spinning.
+      break;else len = state.length;
+  }
+  state.readingMore = false;
+}
 
-  // Flag to properly process Z_BUF_ERROR on testing inflate call
-  // when we check that all output data was flushed.
-  var allowBufError = false;
+// abstract method.  to be overridden in specific implementation classes.
+// call cb(er, data) where data is <= n in length.
+// for virtual (non-string, non-buffer) streams, "length" is somewhat
+// arbitrary, and perhaps not very meaningful.
+Readable.prototype._read = function (n) {
+  this.emit('error', new Error('not implemented'));
+};
 
-  if (this.ended) { return false; }
-  _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);
+Readable.prototype.pipe = function (dest, pipeOpts) {
+  var src = this;
+  var state = this._readableState;
 
-  // Convert data if needed
-  if (typeof data === 'string') {
-    // Only binary strings can be decompressed on practice
-    strm.input = strings.binstring2buf(data);
-  } else if (toString.call(data) === '[object ArrayBuffer]') {
-    strm.input = new Uint8Array(data);
-  } else {
-    strm.input = data;
+  switch (state.pipesCount) {
+    case 0:
+      state.pipes = dest;
+      break;
+    case 1:
+      state.pipes = [state.pipes, dest];
+      break;
+    default:
+      state.pipes.push(dest);
+      break;
   }
+  state.pipesCount += 1;
+  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
 
-  strm.next_in = 0;
-  strm.avail_in = strm.input.length;
+  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
 
-  do {
-    if (strm.avail_out === 0) {
-      strm.output = new utils.Buf8(chunkSize);
-      strm.next_out = 0;
-      strm.avail_out = chunkSize;
+  var endFn = doEnd ? onend : cleanup;
+  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
+
+  dest.on('unpipe', onunpipe);
+  function onunpipe(readable) {
+    debug('onunpipe');
+    if (readable === src) {
+      cleanup();
     }
+  }
 
-    status = zlib_inflate.inflate(strm, c.Z_NO_FLUSH);    /* no bad return value */
+  function onend() {
+    debug('onend');
+    dest.end();
+  }
 
-    if (status === c.Z_NEED_DICT && dictionary) {
-      // Convert data if needed
-      if (typeof dictionary === 'string') {
-        dict = strings.string2buf(dictionary);
-      } else if (toString.call(dictionary) === '[object ArrayBuffer]') {
-        dict = new Uint8Array(dictionary);
-      } else {
-        dict = dictionary;
-      }
+  // when the dest drains, it reduces the awaitDrain counter
+  // on the source.  This would be more elegant with a .once()
+  // handler in flow(), but adding and removing repeatedly is
+  // too slow.
+  var ondrain = pipeOnDrain(src);
+  dest.on('drain', ondrain);
 
-      status = zlib_inflate.inflateSetDictionary(this.strm, dict);
+  var cleanedUp = false;
+  function cleanup() {
+    debug('cleanup');
+    // cleanup event handlers once the pipe is broken
+    dest.removeListener('close', onclose);
+    dest.removeListener('finish', onfinish);
+    dest.removeListener('drain', ondrain);
+    dest.removeListener('error', onerror);
+    dest.removeListener('unpipe', onunpipe);
+    src.removeListener('end', onend);
+    src.removeListener('end', cleanup);
+    src.removeListener('data', ondata);
 
-    }
+    cleanedUp = true;
 
-    if (status === c.Z_BUF_ERROR && allowBufError === true) {
-      status = c.Z_OK;
-      allowBufError = false;
-    }
+    // if the reader is waiting for a drain event from this
+    // specific writer, then it would cause it to never start
+    // flowing again.
+    // So, if this is awaiting a drain, then we just call it now.
+    // If we don't know, then assume that we are waiting for one.
+    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
+  }
 
-    if (status !== c.Z_STREAM_END && status !== c.Z_OK) {
-      this.onEnd(status);
-      this.ended = true;
-      return false;
+  src.on('data', ondata);
+  function ondata(chunk) {
+    debug('ondata');
+    var ret = dest.write(chunk);
+    if (false === ret) {
+      // If the user unpiped during `dest.write()`, it is possible
+      // to get stuck in a permanently paused state if that write
+      // also returned false.
+      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
+        debug('false write response, pause', src._readableState.awaitDrain);
+        src._readableState.awaitDrain++;
+      }
+      src.pause();
     }
+  }
 
-    if (strm.next_out) {
-      if (strm.avail_out === 0 || status === c.Z_STREAM_END || (strm.avail_in === 0 && (_mode === c.Z_FINISH || _mode === c.Z_SYNC_FLUSH))) {
+  // if the dest has an error, then stop piping into it.
+  // however, don't suppress the throwing behavior for this.
+  function onerror(er) {
+    debug('onerror', er);
+    unpipe();
+    dest.removeListener('error', onerror);
+    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
+  }
+  // This is a brutally ugly hack to make sure that our error handler
+  // is attached before any userland ones.  NEVER DO THIS.
+  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];
 
-        if (this.options.to === 'string') {
+  // Both close and finish should trigger unpipe, but only once.
+  function onclose() {
+    dest.removeListener('finish', onfinish);
+    unpipe();
+  }
+  dest.once('close', onclose);
+  function onfinish() {
+    debug('onfinish');
+    dest.removeListener('close', onclose);
+    unpipe();
+  }
+  dest.once('finish', onfinish);
 
-          next_out_utf8 = strings.utf8border(strm.output, strm.next_out);
+  function unpipe() {
+    debug('unpipe');
+    src.unpipe(dest);
+  }
 
-          tail = strm.next_out - next_out_utf8;
-          utf8str = strings.buf2string(strm.output, next_out_utf8);
+  // tell the dest that it's being piped to
+  dest.emit('pipe', src);
 
-          // move tail
-          strm.next_out = tail;
-          strm.avail_out = chunkSize - tail;
-          if (tail) { utils.arraySet(strm.output, strm.output, next_out_utf8, tail, 0); }
+  // start the flow if it hasn't been started already.
+  if (!state.flowing) {
+    debug('pipe resume');
+    src.resume();
+  }
 
-          this.onData(utf8str);
+  return dest;
+};
 
-        } else {
-          this.onData(utils.shrinkBuf(strm.output, strm.next_out));
-        }
-      }
+function pipeOnDrain(src) {
+  return function () {
+    var state = src._readableState;
+    debug('pipeOnDrain', state.awaitDrain);
+    if (state.awaitDrain) state.awaitDrain--;
+    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
+      state.flowing = true;
+      flow(src);
     }
+  };
+}
 
-    // When no more input data, we should check that internal inflate buffers
-    // are flushed. The only way to do it when avail_out = 0 - run one more
-    // inflate pass. But if output data not exists, inflate return Z_BUF_ERROR.
-    // Here we set flag to process this error properly.
-    //
-    // NOTE. Deflate does not return error in this case and does not needs such
-    // logic.
-    if (strm.avail_in === 0 && strm.avail_out === 0) {
-      allowBufError = true;
-    }
+Readable.prototype.unpipe = function (dest) {
+  var state = this._readableState;
 
-  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== c.Z_STREAM_END);
+  // if we're not piping anywhere, then do nothing.
+  if (state.pipesCount === 0) return this;
 
-  if (status === c.Z_STREAM_END) {
-    _mode = c.Z_FINISH;
-  }
+  // just one destination.  most common case.
+  if (state.pipesCount === 1) {
+    // passed in one, but it's not the right one.
+    if (dest && dest !== state.pipes) return this;
 
-  // Finalize on the last chunk.
-  if (_mode === c.Z_FINISH) {
-    status = zlib_inflate.inflateEnd(this.strm);
-    this.onEnd(status);
-    this.ended = true;
-    return status === c.Z_OK;
-  }
+    if (!dest) dest = state.pipes;
 
-  // callback interim results if Z_SYNC_FLUSH.
-  if (_mode === c.Z_SYNC_FLUSH) {
-    this.onEnd(c.Z_OK);
-    strm.avail_out = 0;
-    return true;
+    // got a match.
+    state.pipes = null;
+    state.pipesCount = 0;
+    state.flowing = false;
+    if (dest) dest.emit('unpipe', this);
+    return this;
   }
 
-  return true;
-};
+  // slow case. multiple pipe destinations.
 
+  if (!dest) {
+    // remove all.
+    var dests = state.pipes;
+    var len = state.pipesCount;
+    state.pipes = null;
+    state.pipesCount = 0;
+    state.flowing = false;
 
-/**
- * Inflate#onData(chunk) -> Void
- * - chunk (Uint8Array|Array|String): ouput data. Type of array depends
- *   on js engine support. When string output requested, each chunk
- *   will be string.
- *
- * By default, stores data blocks in `chunks[]` property and glue
- * those in `onEnd`. Override this handler, if you need another behaviour.
- **/
-Inflate.prototype.onData = function (chunk) {
-  this.chunks.push(chunk);
-};
+    for (var _i = 0; _i < len; _i++) {
+      dests[_i].emit('unpipe', this);
+    }return this;
+  }
+
+  // try to find the right one.
+  var i = indexOf(state.pipes, dest);
+  if (i === -1) return this;
 
+  state.pipes.splice(i, 1);
+  state.pipesCount -= 1;
+  if (state.pipesCount === 1) state.pipes = state.pipes[0];
 
-/**
- * Inflate#onEnd(status) -> Void
- * - status (Number): inflate status. 0 (Z_OK) on success,
- *   other if not.
- *
- * Called either after you tell inflate that the input stream is
- * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)
- * or if an error happened. By default - join collected chunks,
- * free memory and fill `results` / `err` properties.
- **/
-Inflate.prototype.onEnd = function (status) {
-  // On success - join
-  if (status === c.Z_OK) {
-    if (this.options.to === 'string') {
-      // Glue & convert here, until we teach pako to send
-      // utf8 alligned strings to onData
-      this.result = this.chunks.join('');
-    } else {
-      this.result = utils.flattenChunks(this.chunks);
-    }
-  }
-  this.chunks = [];
-  this.err = status;
-  this.msg = this.strm.msg;
+  dest.emit('unpipe', this);
+
+  return this;
 };
 
+// set up data events if they are asked for
+// Ensure readable listeners eventually get something
+Readable.prototype.on = function (ev, fn) {
+  var res = Stream.prototype.on.call(this, ev, fn);
 
-/**
- * inflate(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to decompress.
- * - options (Object): zlib inflate options.
- *
- * Decompress `data` with inflate/ungzip and `options`. Autodetect
- * format via wrapper header by default. That's why we don't provide
- * separate `ungzip` method.
- *
- * Supported options are:
- *
- * - windowBits
- *
- * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
- * for more information.
- *
- * Sugar (options):
- *
- * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify
- *   negative windowBits implicitly.
- * - `to` (String) - if equal to 'string', then result will be converted
- *   from utf8 to utf16 (javascript) string. When string output requested,
- *   chunk length can differ from `chunkSize`, depending on content.
- *
- *
- * ##### Example:
- *
- * ```javascript
- * var pako = require('pako')
- *   , input = pako.deflate([1,2,3,4,5,6,7,8,9])
- *   , output;
- *
- * try {
- *   output = pako.inflate(input);
- * } catch (err)
- *   console.log(err);
- * }
- * ```
- **/
-function inflate(input, options) {
-  var inflator = new Inflate(options);
+  // If listening to data, and it has not explicitly been paused,
+  // then call resume to start the flow of data on the next tick.
+  if (ev === 'data' && false !== this._readableState.flowing) {
+    this.resume();
+  }
 
-  inflator.push(input, true);
+  if (ev === 'readable' && !this._readableState.endEmitted) {
+    var state = this._readableState;
+    if (!state.readableListening) {
+      state.readableListening = true;
+      state.emittedReadable = false;
+      state.needReadable = true;
+      if (!state.reading) {
+        processNextTick(nReadingNextTick, this);
+      } else if (state.length) {
+        emitReadable(this, state);
+      }
+    }
+  }
 
-  // That will never happens, if you don't cheat with options :)
-  if (inflator.err) { throw inflator.msg || msg[inflator.err]; }
+  return res;
+};
+Readable.prototype.addListener = Readable.prototype.on;
 
-  return inflator.result;
+function nReadingNextTick(self) {
+  debug('readable nexttick read 0');
+  self.read(0);
 }
 
+// pause() and resume() are remnants of the legacy readable stream API
+// If the user uses them, then switch into old mode.
+Readable.prototype.resume = function () {
+  var state = this._readableState;
+  if (!state.flowing) {
+    debug('resume');
+    state.flowing = true;
+    resume(this, state);
+  }
+  return this;
+};
 
-/**
- * inflateRaw(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to decompress.
- * - options (Object): zlib inflate options.
- *
- * The same as [[inflate]], but creates raw data, without wrapper
- * (header and adler32 crc).
- **/
-function inflateRaw(input, options) {
-  options = options || {};
-  options.raw = true;
-  return inflate(input, options);
+function resume(stream, state) {
+  if (!state.resumeScheduled) {
+    state.resumeScheduled = true;
+    processNextTick(resume_, stream, state);
+  }
 }
 
+function resume_(stream, state) {
+  if (!state.reading) {
+    debug('resume read 0');
+    stream.read(0);
+  }
 
-/**
- * ungzip(data[, options]) -> Uint8Array|Array|String
- * - data (Uint8Array|Array|String): input data to decompress.
- * - options (Object): zlib inflate options.
- *
- * Just shortcut to [[inflate]], because it autodetects format
- * by header.content. Done for convenience.
- **/
+  state.resumeScheduled = false;
+  stream.emit('resume');
+  flow(stream);
+  if (state.flowing && !state.reading) stream.read(0);
+}
 
+Readable.prototype.pause = function () {
+  debug('call pause flowing=%j', this._readableState.flowing);
+  if (false !== this._readableState.flowing) {
+    debug('pause');
+    this._readableState.flowing = false;
+    this.emit('pause');
+  }
+  return this;
+};
 
-exports.Inflate = Inflate;
-exports.inflate = inflate;
-exports.inflateRaw = inflateRaw;
-exports.ungzip  = inflate;
+function flow(stream) {
+  var state = stream._readableState;
+  debug('flow', state.flowing);
+  if (state.flowing) {
+    do {
+      var chunk = stream.read();
+    } while (null !== chunk && state.flowing);
+  }
+}
 
-},{"./utils/common":163,"./utils/strings":164,"./zlib/constants":166,"./zlib/gzheader":169,"./zlib/inflate":171,"./zlib/messages":173,"./zlib/zstream":175}],163:[function(_dereq_,module,exports){
-'use strict';
+// wrap an old-style stream as the async data source.
+// This is *not* part of the readable stream interface.
+// It is an ugly unfortunate mess of history.
+Readable.prototype.wrap = function (stream) {
+  var state = this._readableState;
+  var paused = false;
 
+  var self = this;
+  stream.on('end', function () {
+    debug('wrapped end');
+    if (state.decoder && !state.ended) {
+      var chunk = state.decoder.end();
+      if (chunk && chunk.length) self.push(chunk);
+    }
 
-var TYPED_OK =  (typeof Uint8Array !== 'undefined') &&
-                (typeof Uint16Array !== 'undefined') &&
-                (typeof Int32Array !== 'undefined');
+    self.push(null);
+  });
 
+  stream.on('data', function (chunk) {
+    debug('wrapped data');
+    if (state.decoder) chunk = state.decoder.write(chunk);
 
-exports.assign = function (obj /*from1, from2, from3, ...*/) {
-  var sources = Array.prototype.slice.call(arguments, 1);
-  while (sources.length) {
-    var source = sources.shift();
-    if (!source) { continue; }
+    // don't skip over falsy values in objectMode
+    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
 
-    if (typeof source !== 'object') {
-      throw new TypeError(source + 'must be non-object');
+    var ret = self.push(chunk);
+    if (!ret) {
+      paused = true;
+      stream.pause();
     }
+  });
 
-    for (var p in source) {
-      if (source.hasOwnProperty(p)) {
-        obj[p] = source[p];
-      }
+  // proxy all the other methods.
+  // important when wrapping filters and duplexes.
+  for (var i in stream) {
+    if (this[i] === undefined && typeof stream[i] === 'function') {
+      this[i] = function (method) {
+        return function () {
+          return stream[method].apply(stream, arguments);
+        };
+      }(i);
     }
   }
 
-  return obj;
-};
+  // proxy certain important events.
+  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
+  forEach(events, function (ev) {
+    stream.on(ev, self.emit.bind(self, ev));
+  });
 
+  // when we try to consume some more bytes, simply unpause the
+  // underlying stream.
+  self._read = function (n) {
+    debug('wrapped _read', n);
+    if (paused) {
+      paused = false;
+      stream.resume();
+    }
+  };
 
-// reduce buffer size, avoiding mem copy
-exports.shrinkBuf = function (buf, size) {
-  if (buf.length === size) { return buf; }
-  if (buf.subarray) { return buf.subarray(0, size); }
-  buf.length = size;
-  return buf;
+  return self;
 };
 
+// exposed for testing purposes only.
+Readable._fromList = fromList;
 
-var fnTyped = {
-  arraySet: function (dest, src, src_offs, len, dest_offs) {
-    if (src.subarray && dest.subarray) {
-      dest.set(src.subarray(src_offs, src_offs + len), dest_offs);
-      return;
-    }
-    // Fallback to ordinary array
-    for (var i = 0; i < len; i++) {
-      dest[dest_offs + i] = src[src_offs + i];
-    }
-  },
-  // Join array of chunks to single array.
-  flattenChunks: function (chunks) {
-    var i, l, len, pos, chunk, result;
+// Pluck off n bytes from an array of buffers.
+// Length is the combined lengths of all the buffers in the list.
+function fromList(n, state) {
+  var list = state.buffer;
+  var length = state.length;
+  var stringMode = !!state.decoder;
+  var objectMode = !!state.objectMode;
+  var ret;
 
-    // calculate data length
-    len = 0;
-    for (i = 0, l = chunks.length; i < l; i++) {
-      len += chunks[i].length;
-    }
+  // nothing in the list, definitely empty.
+  if (list.length === 0) return null;
 
-    // join chunks
-    result = new Uint8Array(len);
-    pos = 0;
-    for (i = 0, l = chunks.length; i < l; i++) {
-      chunk = chunks[i];
-      result.set(chunk, pos);
-      pos += chunk.length;
-    }
+  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
+    // read it all, truncate the array.
+    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
+    list.length = 0;
+  } else {
+    // read just some of it.
+    if (n < list[0].length) {
+      // just take a part of the first list item.
+      // slice is the same for buffers and strings.
+      var buf = list[0];
+      ret = buf.slice(0, n);
+      list[0] = buf.slice(n);
+    } else if (n === list[0].length) {
+      // first list is a perfect match
+      ret = list.shift();
+    } else {
+      // complex case.
+      // we have enough to cover it, but it spans past the first buffer.
+      if (stringMode) ret = '';else ret = new Buffer(n);
 
-    return result;
-  }
-};
+      var c = 0;
+      for (var i = 0, l = list.length; i < l && c < n; i++) {
+        var buf = list[0];
+        var cpy = Math.min(n - c, buf.length);
 
-var fnUntyped = {
-  arraySet: function (dest, src, src_offs, len, dest_offs) {
-    for (var i = 0; i < len; i++) {
-      dest[dest_offs + i] = src[src_offs + i];
+        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);
+
+        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();
+
+        c += cpy;
+      }
     }
-  },
-  // Join array of chunks to single array.
-  flattenChunks: function (chunks) {
-    return [].concat.apply([], chunks);
   }
-};
 
+  return ret;
+}
 
-// Enable/Disable typed arrays use, for testing
-//
-exports.setTyped = function (on) {
-  if (on) {
-    exports.Buf8  = Uint8Array;
-    exports.Buf16 = Uint16Array;
-    exports.Buf32 = Int32Array;
-    exports.assign(exports, fnTyped);
-  } else {
-    exports.Buf8  = Array;
-    exports.Buf16 = Array;
-    exports.Buf32 = Array;
-    exports.assign(exports, fnUntyped);
-  }
-};
+function endReadable(stream) {
+  var state = stream._readableState;
 
-exports.setTyped(TYPED_OK);
+  // If we get here before consuming all the bytes, then that is a
+  // bug in node.  Should never happen.
+  if (state.length > 0) throw new Error('endReadable called on non-empty stream');
 
-},{}],164:[function(_dereq_,module,exports){
-// String encode/decode helpers
-'use strict';
+  if (!state.endEmitted) {
+    state.ended = true;
+    processNextTick(endReadableNT, state, stream);
+  }
+}
 
+function endReadableNT(state, stream) {
+  // Check that we didn't get one last unshift.
+  if (!state.endEmitted && state.length === 0) {
+    state.endEmitted = true;
+    stream.readable = false;
+    stream.emit('end');
+  }
+}
 
-var utils = _dereq_('./common');
+function forEach(xs, f) {
+  for (var i = 0, l = xs.length; i < l; i++) {
+    f(xs[i], i);
+  }
+}
 
+function indexOf(xs, x) {
+  for (var i = 0, l = xs.length; i < l; i++) {
+    if (xs[i] === x) return i;
+  }
+  return -1;
+}
+}).call(this,_dereq_('_process'))
 
-// Quick check if we can use fast array to bin string conversion
+},{"./_stream_duplex":158,"_process":184,"buffer":5,"core-util-is":70,"events":73,"inherits":94,"isarray":96,"process-nextick-args":183,"string_decoder/":185,"util":4}],161:[function(_dereq_,module,exports){
+// a transform stream is a readable/writable stream where you do
+// something with the data.  Sometimes it's called a "filter",
+// but that's not a great name for it, since that implies a thing where
+// some bits pass through, and others are simply ignored.  (That would
+// be a valid example of a transform, of course.)
 //
-// - apply(Array) can fail on Android 2.2
-// - apply(Uint8Array) can fail on iOS 5.1 Safary
+// While the output is causally related to the input, it's not a
+// necessarily symmetric or synchronous transformation.  For example,
+// a zlib stream might take multiple plain-text writes(), and then
+// emit a single compressed chunk some time in the future.
 //
-var STR_APPLY_OK = true;
-var STR_APPLY_UIA_OK = true;
+// Here's how this works:
+//
+// The Transform stream has all the aspects of the readable and writable
+// stream classes.  When you write(chunk), that calls _write(chunk,cb)
+// internally, and returns false if there's a lot of pending writes
+// buffered up.  When you call read(), that calls _read(n) until
+// there's enough pending readable data buffered up.
+//
+// In a transform stream, the written data is placed in a buffer.  When
+// _read(n) is called, it transforms the queued up data, calling the
+// buffered _write cb's as it consumes chunks.  If consuming a single
+// written chunk would result in multiple output chunks, then the first
+// outputted bit calls the readcb, and subsequent chunks just go into
+// the read buffer, and will cause it to emit 'readable' if necessary.
+//
+// This way, back-pressure is actually determined by the reading side,
+// since _read has to be called to start processing a new chunk.  However,
+// a pathological inflate type of transform can cause excessive buffering
+// here.  For example, imagine a stream where every byte of input is
+// interpreted as an integer from 0-255, and then results in that many
+// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
+// 1kb of data being output.  In this case, you could write a very small
+// amount of input, and end up with a very large amount of output.  In
+// such a pathological inflating mechanism, there'd be no way to tell
+// the system to stop doing the transform.  A single 4MB write could
+// cause the system to run out of memory.
+//
+// However, even in such a pathological case, only a single written chunk
+// would be consumed, and then the rest would wait (un-transformed) until
+// the results of the previous transformed chunk were consumed.
 
-try { String.fromCharCode.apply(null, [ 0 ]); } catch (__) { STR_APPLY_OK = false; }
-try { String.fromCharCode.apply(null, new Uint8Array(1)); } catch (__) { STR_APPLY_UIA_OK = false; }
+'use strict';
 
+module.exports = Transform;
 
-// Table with utf8 lengths (calculated by first byte of sequence)
-// Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,
-// because max possible codepoint is 0x10ffff
-var _utf8len = new utils.Buf8(256);
-for (var q = 0; q < 256; q++) {
-  _utf8len[q] = (q >= 252 ? 6 : q >= 248 ? 5 : q >= 240 ? 4 : q >= 224 ? 3 : q >= 192 ? 2 : 1);
-}
-_utf8len[254] = _utf8len[254] = 1; // Invalid sequence start
+var Duplex = _dereq_('./_stream_duplex');
 
+/*<replacement>*/
+var util = _dereq_('core-util-is');
+util.inherits = _dereq_('inherits');
+/*</replacement>*/
 
-// convert string to array (typed, when possible)
-exports.string2buf = function (str) {
-  var buf, c, c2, m_pos, i, str_len = str.length, buf_len = 0;
+util.inherits(Transform, Duplex);
 
-  // count binary size
-  for (m_pos = 0; m_pos < str_len; m_pos++) {
-    c = str.charCodeAt(m_pos);
-    if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {
-      c2 = str.charCodeAt(m_pos + 1);
-      if ((c2 & 0xfc00) === 0xdc00) {
-        c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
-        m_pos++;
-      }
-    }
-    buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;
-  }
-
-  // allocate buffer
-  buf = new utils.Buf8(buf_len);
+function TransformState(stream) {
+  this.afterTransform = function (er, data) {
+    return afterTransform(stream, er, data);
+  };
 
-  // convert
-  for (i = 0, m_pos = 0; i < buf_len; m_pos++) {
-    c = str.charCodeAt(m_pos);
-    if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {
-      c2 = str.charCodeAt(m_pos + 1);
-      if ((c2 & 0xfc00) === 0xdc00) {
-        c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
-        m_pos++;
-      }
-    }
-    if (c < 0x80) {
-      /* one byte */
-      buf[i++] = c;
-    } else if (c < 0x800) {
-      /* two bytes */
-      buf[i++] = 0xC0 | (c >>> 6);
-      buf[i++] = 0x80 | (c & 0x3f);
-    } else if (c < 0x10000) {
-      /* three bytes */
-      buf[i++] = 0xE0 | (c >>> 12);
-      buf[i++] = 0x80 | (c >>> 6 & 0x3f);
-      buf[i++] = 0x80 | (c & 0x3f);
-    } else {
-      /* four bytes */
-      buf[i++] = 0xf0 | (c >>> 18);
-      buf[i++] = 0x80 | (c >>> 12 & 0x3f);
-      buf[i++] = 0x80 | (c >>> 6 & 0x3f);
-      buf[i++] = 0x80 | (c & 0x3f);
-    }
-  }
+  this.needTransform = false;
+  this.transforming = false;
+  this.writecb = null;
+  this.writechunk = null;
+  this.writeencoding = null;
+}
 
-  return buf;
-};
+function afterTransform(stream, er, data) {
+  var ts = stream._transformState;
+  ts.transforming = false;
 
-// Helper (used in 2 places)
-function buf2binstring(buf, len) {
-  // use fallback for big arrays to avoid stack overflow
-  if (len < 65537) {
-    if ((buf.subarray && STR_APPLY_UIA_OK) || (!buf.subarray && STR_APPLY_OK)) {
-      return String.fromCharCode.apply(null, utils.shrinkBuf(buf, len));
-    }
-  }
+  var cb = ts.writecb;
 
-  var result = '';
-  for (var i = 0; i < len; i++) {
-    result += String.fromCharCode(buf[i]);
-  }
-  return result;
-}
+  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
 
+  ts.writechunk = null;
+  ts.writecb = null;
 
-// Convert byte array to binary string
-exports.buf2binstring = function (buf) {
-  return buf2binstring(buf, buf.length);
-};
+  if (data !== null && data !== undefined) stream.push(data);
 
+  cb(er);
 
-// Convert binary string (typed, when possible)
-exports.binstring2buf = function (str) {
-  var buf = new utils.Buf8(str.length);
-  for (var i = 0, len = buf.length; i < len; i++) {
-    buf[i] = str.charCodeAt(i);
+  var rs = stream._readableState;
+  rs.reading = false;
+  if (rs.needReadable || rs.length < rs.highWaterMark) {
+    stream._read(rs.highWaterMark);
   }
-  return buf;
-};
+}
 
+function Transform(options) {
+  if (!(this instanceof Transform)) return new Transform(options);
 
-// convert array to string
-exports.buf2string = function (buf, max) {
-  var i, out, c, c_len;
-  var len = max || buf.length;
+  Duplex.call(this, options);
 
-  // Reserve max possible length (2 words per char)
-  // NB: by unknown reasons, Array is significantly faster for
-  //     String.fromCharCode.apply than Uint16Array.
-  var utf16buf = new Array(len * 2);
+  this._transformState = new TransformState(this);
 
-  for (out = 0, i = 0; i < len;) {
-    c = buf[i++];
-    // quick process ascii
-    if (c < 0x80) { utf16buf[out++] = c; continue; }
+  // when the writable side finishes, then flush out anything remaining.
+  var stream = this;
 
-    c_len = _utf8len[c];
-    // skip 5 & 6 byte codes
-    if (c_len > 4) { utf16buf[out++] = 0xfffd; i += c_len - 1; continue; }
+  // start out asking for a readable event once data is transformed.
+  this._readableState.needReadable = true;
 
-    // apply mask on first byte
-    c &= c_len === 2 ? 0x1f : c_len === 3 ? 0x0f : 0x07;
-    // join the rest
-    while (c_len > 1 && i < len) {
-      c = (c << 6) | (buf[i++] & 0x3f);
-      c_len--;
-    }
+  // we have implemented the _read method, and done the other things
+  // that Readable wants before the first _read call, so unset the
+  // sync guard flag.
+  this._readableState.sync = false;
 
-    // terminated by end of string?
-    if (c_len > 1) { utf16buf[out++] = 0xfffd; continue; }
+  if (options) {
+    if (typeof options.transform === 'function') this._transform = options.transform;
 
-    if (c < 0x10000) {
-      utf16buf[out++] = c;
-    } else {
-      c -= 0x10000;
-      utf16buf[out++] = 0xd800 | ((c >> 10) & 0x3ff);
-      utf16buf[out++] = 0xdc00 | (c & 0x3ff);
-    }
+    if (typeof options.flush === 'function') this._flush = options.flush;
   }
 
-  return buf2binstring(utf16buf, out);
-};
+  this.once('prefinish', function () {
+    if (typeof this._flush === 'function') this._flush(function (er) {
+      done(stream, er);
+    });else done(stream);
+  });
+}
 
+Transform.prototype.push = function (chunk, encoding) {
+  this._transformState.needTransform = false;
+  return Duplex.prototype.push.call(this, chunk, encoding);
+};
 
-// Calculate max possible position in utf8 buffer,
-// that will not break sequence. If that's not possible
-// - (very small limits) return max size as is.
+// This is the part where you do stuff!
+// override this function in implementation classes.
+// 'chunk' is an input chunk.
 //
-// buf[] - utf8 bytes array
-// max   - length limit (mandatory);
-exports.utf8border = function (buf, max) {
-  var pos;
-
-  max = max || buf.length;
-  if (max > buf.length) { max = buf.length; }
-
-  // go back from last position, until start of sequence found
-  pos = max - 1;
-  while (pos >= 0 && (buf[pos] & 0xC0) === 0x80) { pos--; }
+// Call `push(newChunk)` to pass along transformed output
+// to the readable side.  You may call 'push' zero or more times.
+//
+// Call `cb(err)` when you are done with this chunk.  If you pass
+// an error, then that'll put the hurt on the whole operation.  If you
+// never call cb(), then you'll never get another chunk.
+Transform.prototype._transform = function (chunk, encoding, cb) {
+  throw new Error('not implemented');
+};
 
-  // Fuckup - very small and broken sequence,
-  // return max, because we should return something anyway.
-  if (pos < 0) { return max; }
+Transform.prototype._write = function (chunk, encoding, cb) {
+  var ts = this._transformState;
+  ts.writecb = cb;
+  ts.writechunk = chunk;
+  ts.writeencoding = encoding;
+  if (!ts.transforming) {
+    var rs = this._readableState;
+    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
+  }
+};
 
-  // If we came to start of buffer - that means vuffer is too small,
-  // return max too.
-  if (pos === 0) { return max; }
+// Doesn't matter what the args are here.
+// _transform does all the work.
+// That we got here means that the readable side wants more data.
+Transform.prototype._read = function (n) {
+  var ts = this._transformState;
 
-  return (pos + _utf8len[buf[pos]] > max) ? pos : max;
+  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
+    ts.transforming = true;
+    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
+  } else {
+    // mark that we need a transform, so that any data that comes in
+    // will get processed, now that we've asked for it.
+    ts.needTransform = true;
+  }
 };
 
-},{"./common":163}],165:[function(_dereq_,module,exports){
-'use strict';
+function done(stream, er) {
+  if (er) return stream.emit('error', er);
 
-// Note: adler32 takes 12% for level 0 and 2% for level 6.
-// It doesn't worth to make additional optimizationa as in original.
-// Small size is preferable.
+  // if there's nothing in the write buffer, then that means
+  // that nothing more will ever be provided
+  var ws = stream._writableState;
+  var ts = stream._transformState;
 
-function adler32(adler, buf, len, pos) {
-  var s1 = (adler & 0xffff) |0,
-      s2 = ((adler >>> 16) & 0xffff) |0,
-      n = 0;
+  if (ws.length) throw new Error('calling transform done when ws.length != 0');
 
-  while (len !== 0) {
-    // Set limit ~ twice less than 5552, to keep
-    // s2 in 31-bits, because we force signed ints.
-    // in other case %= will fail.
-    n = len > 2000 ? 2000 : len;
-    len -= n;
+  if (ts.transforming) throw new Error('calling transform done when still transforming');
 
-    do {
-      s1 = (s1 + buf[pos++]) |0;
-      s2 = (s2 + s1) |0;
-    } while (--n);
+  return stream.push(null);
+}
+},{"./_stream_duplex":158,"core-util-is":70,"inherits":94}],162:[function(_dereq_,module,exports){
+(function (process){
+// A bit simpler than readable streams.
+// Implement an async ._write(chunk, encoding, cb), and it'll handle all
+// the drain event emission and buffering.
 
-    s1 %= 65521;
-    s2 %= 65521;
-  }
+'use strict';
 
-  return (s1 | (s2 << 16)) |0;
-}
+module.exports = Writable;
 
+/*<replacement>*/
+var processNextTick = _dereq_('process-nextick-args');
+/*</replacement>*/
 
-module.exports = adler32;
+/*<replacement>*/
+var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
+/*</replacement>*/
 
-},{}],166:[function(_dereq_,module,exports){
-'use strict';
+/*<replacement>*/
+var Buffer = _dereq_('buffer').Buffer;
+/*</replacement>*/
 
+Writable.WritableState = WritableState;
 
-module.exports = {
+/*<replacement>*/
+var util = _dereq_('core-util-is');
+util.inherits = _dereq_('inherits');
+/*</replacement>*/
 
-  /* Allowed flush values; see deflate() and inflate() below for details */
-  Z_NO_FLUSH:         0,
-  Z_PARTIAL_FLUSH:    1,
-  Z_SYNC_FLUSH:       2,
-  Z_FULL_FLUSH:       3,
-  Z_FINISH:           4,
-  Z_BLOCK:            5,
-  Z_TREES:            6,
+/*<replacement>*/
+var internalUtil = {
+  deprecate: _dereq_('util-deprecate')
+};
+/*</replacement>*/
 
-  /* Return codes for the compression/decompression functions. Negative values
-  * are errors, positive values are used for special but normal events.
-  */
-  Z_OK:               0,
-  Z_STREAM_END:       1,
-  Z_NEED_DICT:        2,
-  Z_ERRNO:           -1,
-  Z_STREAM_ERROR:    -2,
-  Z_DATA_ERROR:      -3,
-  //Z_MEM_ERROR:     -4,
-  Z_BUF_ERROR:       -5,
-  //Z_VERSION_ERROR: -6,
+/*<replacement>*/
+var Stream;
+(function () {
+  try {
+    Stream = _dereq_('st' + 'ream');
+  } catch (_) {} finally {
+    if (!Stream) Stream = _dereq_('events').EventEmitter;
+  }
+})();
+/*</replacement>*/
 
-  /* compression levels */
-  Z_NO_COMPRESSION:         0,
-  Z_BEST_SPEED:             1,
-  Z_BEST_COMPRESSION:       9,
-  Z_DEFAULT_COMPRESSION:   -1,
+var Buffer = _dereq_('buffer').Buffer;
 
+util.inherits(Writable, Stream);
 
-  Z_FILTERED:               1,
-  Z_HUFFMAN_ONLY:           2,
-  Z_RLE:                    3,
-  Z_FIXED:                  4,
-  Z_DEFAULT_STRATEGY:       0,
+function nop() {}
 
-  /* Possible values of the data_type field (though see inflate()) */
-  Z_BINARY:                 0,
-  Z_TEXT:                   1,
-  //Z_ASCII:                1, // = Z_TEXT (deprecated)
-  Z_UNKNOWN:                2,
+function WriteReq(chunk, encoding, cb) {
+  this.chunk = chunk;
+  this.encoding = encoding;
+  this.callback = cb;
+  this.next = null;
+}
 
-  /* The deflate compression method */
-  Z_DEFLATED:               8
-  //Z_NULL:                 null // Use -1 or null inline, depending on var type
-};
+var Duplex;
+function WritableState(options, stream) {
+  Duplex = Duplex || _dereq_('./_stream_duplex');
 
-},{}],167:[function(_dereq_,module,exports){
-'use strict';
+  options = options || {};
 
-// Note: we can't get significant speed boost here.
-// So write code to minimize size - no pregenerated tables
-// and array tools dependencies.
+  // object stream flag to indicate whether or not this stream
+  // contains buffers or objects.
+  this.objectMode = !!options.objectMode;
 
+  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
 
-// Use ordinary array, since untyped makes no boost here
-function makeTable() {
-  var c, table = [];
+  // the point at which write() starts returning false
+  // Note: 0 is a valid value, means that we always return false if
+  // the entire buffer is not flushed immediately on write()
+  var hwm = options.highWaterMark;
+  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
+  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
 
-  for (var n = 0; n < 256; n++) {
-    c = n;
-    for (var k = 0; k < 8; k++) {
-      c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
-    }
-    table[n] = c;
-  }
+  // cast to ints.
+  this.highWaterMark = ~ ~this.highWaterMark;
 
-  return table;
-}
+  this.needDrain = false;
+  // at the start of calling end()
+  this.ending = false;
+  // when end() has been called, and returned
+  this.ended = false;
+  // when 'finish' is emitted
+  this.finished = false;
 
-// Create table on load. Just 255 signed longs. Not a problem.
-var crcTable = makeTable();
+  // should we decode strings into buffers before passing to _write?
+  // this is here so that some node-core streams can optimize string
+  // handling at a lower level.
+  var noDecode = options.decodeStrings === false;
+  this.decodeStrings = !noDecode;
 
+  // Crypto is kind of old and crusty.  Historically, its default string
+  // encoding is 'binary' so we have to make this configurable.
+  // Everything else in the universe uses 'utf8', though.
+  this.defaultEncoding = options.defaultEncoding || 'utf8';
 
-function crc32(crc, buf, len, pos) {
-  var t = crcTable,
-      end = pos + len;
+  // not an actual buffer we keep track of, but a measurement
+  // of how much we're waiting to get pushed to some underlying
+  // socket or file.
+  this.length = 0;
 
-  crc ^= -1;
+  // a flag to see when we're in the middle of a write.
+  this.writing = false;
 
-  for (var i = pos; i < end; i++) {
-    crc = (crc >>> 8) ^ t[(crc ^ buf[i]) & 0xFF];
-  }
+  // when true all writes will be buffered until .uncork() call
+  this.corked = 0;
 
-  return (crc ^ (-1)); // >>> 0;
-}
+  // a flag to be able to tell if the onwrite cb is called immediately,
+  // or on a later tick.  We set this to true at first, because any
+  // actions that shouldn't happen until "later" should generally also
+  // not happen before the first write call.
+  this.sync = true;
 
+  // a flag to know if we're processing previously buffered items, which
+  // may call the _write() callback in the same tick, so that we don't
+  // end up in an overlapped onwrite situation.
+  this.bufferProcessing = false;
 
-module.exports = crc32;
+  // the callback that's passed to _write(chunk,cb)
+  this.onwrite = function (er) {
+    onwrite(stream, er);
+  };
 
-},{}],168:[function(_dereq_,module,exports){
-'use strict';
+  // the callback that the user supplies to write(chunk,encoding,cb)
+  this.writecb = null;
 
-var utils   = _dereq_('../utils/common');
-var trees   = _dereq_('./trees');
-var adler32 = _dereq_('./adler32');
-var crc32   = _dereq_('./crc32');
-var msg     = _dereq_('./messages');
+  // the amount that is being written when _write is called.
+  this.writelen = 0;
 
-/* Public constants ==========================================================*/
-/* ===========================================================================*/
+  this.bufferedRequest = null;
+  this.lastBufferedRequest = null;
 
+  // number of pending user-supplied write callbacks
+  // this must be 0 before 'finish' can be emitted
+  this.pendingcb = 0;
 
-/* Allowed flush values; see deflate() and inflate() below for details */
-var Z_NO_FLUSH      = 0;
-var Z_PARTIAL_FLUSH = 1;
-//var Z_SYNC_FLUSH    = 2;
-var Z_FULL_FLUSH    = 3;
-var Z_FINISH        = 4;
-var Z_BLOCK         = 5;
-//var Z_TREES         = 6;
+  // emit prefinish if the only thing we're waiting for is _write cbs
+  // This is relevant for synchronous Transform streams
+  this.prefinished = false;
 
+  // True if the error was already emitted and should not be thrown again
+  this.errorEmitted = false;
 
-/* Return codes for the compression/decompression functions. Negative values
- * are errors, positive values are used for special but normal events.
- */
-var Z_OK            = 0;
-var Z_STREAM_END    = 1;
-//var Z_NEED_DICT     = 2;
-//var Z_ERRNO         = -1;
-var Z_STREAM_ERROR  = -2;
-var Z_DATA_ERROR    = -3;
-//var Z_MEM_ERROR     = -4;
-var Z_BUF_ERROR     = -5;
-//var Z_VERSION_ERROR = -6;
+  // count buffered requests
+  this.bufferedRequestCount = 0;
 
+  // create the two objects needed to store the corked requests
+  // they are not a linked list, as no new elements are inserted in there
+  this.corkedRequestsFree = new CorkedRequest(this);
+  this.corkedRequestsFree.next = new CorkedRequest(this);
+}
 
-/* compression levels */
-//var Z_NO_COMPRESSION      = 0;
-//var Z_BEST_SPEED          = 1;
-//var Z_BEST_COMPRESSION    = 9;
-var Z_DEFAULT_COMPRESSION = -1;
+WritableState.prototype.getBuffer = function writableStateGetBuffer() {
+  var current = this.bufferedRequest;
+  var out = [];
+  while (current) {
+    out.push(current);
+    current = current.next;
+  }
+  return out;
+};
 
+(function () {
+  try {
+    Object.defineProperty(WritableState.prototype, 'buffer', {
+      get: internalUtil.deprecate(function () {
+        return this.getBuffer();
+      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
+    });
+  } catch (_) {}
+})();
 
-var Z_FILTERED            = 1;
-var Z_HUFFMAN_ONLY        = 2;
-var Z_RLE                 = 3;
-var Z_FIXED               = 4;
-var Z_DEFAULT_STRATEGY    = 0;
+var Duplex;
+function Writable(options) {
+  Duplex = Duplex || _dereq_('./_stream_duplex');
 
-/* Possible values of the data_type field (though see inflate()) */
-//var Z_BINARY              = 0;
-//var Z_TEXT                = 1;
-//var Z_ASCII               = 1; // = Z_TEXT
-var Z_UNKNOWN             = 2;
+  // Writable ctor is applied to Duplexes, though they're not
+  // instanceof Writable, they're instanceof Readable.
+  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
 
+  this._writableState = new WritableState(options, this);
 
-/* The deflate compression method */
-var Z_DEFLATED  = 8;
+  // legacy.
+  this.writable = true;
 
-/*============================================================================*/
+  if (options) {
+    if (typeof options.write === 'function') this._write = options.write;
 
+    if (typeof options.writev === 'function') this._writev = options.writev;
+  }
 
-var MAX_MEM_LEVEL = 9;
-/* Maximum value for memLevel in deflateInit2 */
-var MAX_WBITS = 15;
-/* 32K LZ77 window */
-var DEF_MEM_LEVEL = 8;
+  Stream.call(this);
+}
 
+// Otherwise people can pipe Writable streams, which is just wrong.
+Writable.prototype.pipe = function () {
+  this.emit('error', new Error('Cannot pipe. Not readable.'));
+};
 
-var LENGTH_CODES  = 29;
-/* number of length codes, not counting the special END_BLOCK code */
-var LITERALS      = 256;
-/* number of literal bytes 0..255 */
-var L_CODES       = LITERALS + 1 + LENGTH_CODES;
-/* number of Literal or Length codes, including the END_BLOCK code */
-var D_CODES       = 30;
-/* number of distance codes */
-var BL_CODES      = 19;
-/* number of codes used to transfer the bit lengths */
-var HEAP_SIZE     = 2 * L_CODES + 1;
-/* maximum heap size */
-var MAX_BITS  = 15;
-/* All codes must not exceed MAX_BITS bits */
-
-var MIN_MATCH = 3;
-var MAX_MATCH = 258;
-var MIN_LOOKAHEAD = (MAX_MATCH + MIN_MATCH + 1);
-
-var PRESET_DICT = 0x20;
-
-var INIT_STATE = 42;
-var EXTRA_STATE = 69;
-var NAME_STATE = 73;
-var COMMENT_STATE = 91;
-var HCRC_STATE = 103;
-var BUSY_STATE = 113;
-var FINISH_STATE = 666;
-
-var BS_NEED_MORE      = 1; /* block not completed, need more input or more output */
-var BS_BLOCK_DONE     = 2; /* block flush performed */
-var BS_FINISH_STARTED = 3; /* finish started, need only more output at next deflate */
-var BS_FINISH_DONE    = 4; /* finish done, accept no more input or output */
+function writeAfterEnd(stream, cb) {
+  var er = new Error('write after end');
+  // TODO: defer error events consistently everywhere, not just the cb
+  stream.emit('error', er);
+  processNextTick(cb, er);
+}
 
-var OS_CODE = 0x03; // Unix :) . Don't detect, use this default.
+// If we get something that is not a buffer, string, null, or undefined,
+// and we're not in objectMode, then that's an error.
+// Otherwise stream chunks are all considered to be of length=1, and the
+// watermarks determine how many objects to keep in the buffer, rather than
+// how many bytes or characters.
+function validChunk(stream, state, chunk, cb) {
+  var valid = true;
 
-function err(strm, errorCode) {
-  strm.msg = msg[errorCode];
-  return errorCode;
+  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
+    var er = new TypeError('Invalid non-string/buffer chunk');
+    stream.emit('error', er);
+    processNextTick(cb, er);
+    valid = false;
+  }
+  return valid;
 }
 
-function rank(f) {
-  return ((f) << 1) - ((f) > 4 ? 9 : 0);
-}
+Writable.prototype.write = function (chunk, encoding, cb) {
+  var state = this._writableState;
+  var ret = false;
 
-function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }
+  if (typeof encoding === 'function') {
+    cb = encoding;
+    encoding = null;
+  }
 
+  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
 
-/* =========================================================================
- * Flush as much pending output as possible. All deflate() output goes
- * through this function so some applications may wish to modify it
- * to avoid allocating a large strm->output buffer and copying into it.
- * (See also read_buf()).
- */
-function flush_pending(strm) {
-  var s = strm.state;
+  if (typeof cb !== 'function') cb = nop;
 
-  //_tr_flush_bits(s);
-  var len = s.pending;
-  if (len > strm.avail_out) {
-    len = strm.avail_out;
+  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
+    state.pendingcb++;
+    ret = writeOrBuffer(this, state, chunk, encoding, cb);
   }
-  if (len === 0) { return; }
 
-  utils.arraySet(strm.output, s.pending_buf, s.pending_out, len, strm.next_out);
-  strm.next_out += len;
-  s.pending_out += len;
-  strm.total_out += len;
-  strm.avail_out -= len;
-  s.pending -= len;
-  if (s.pending === 0) {
-    s.pending_out = 0;
-  }
-}
+  return ret;
+};
 
+Writable.prototype.cork = function () {
+  var state = this._writableState;
 
-function flush_block_only(s, last) {
-  trees._tr_flush_block(s, (s.block_start >= 0 ? s.block_start : -1), s.strstart - s.block_start, last);
-  s.block_start = s.strstart;
-  flush_pending(s.strm);
-}
+  state.corked++;
+};
 
+Writable.prototype.uncork = function () {
+  var state = this._writableState;
 
-function put_byte(s, b) {
-  s.pending_buf[s.pending++] = b;
-}
+  if (state.corked) {
+    state.corked--;
 
+    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
+  }
+};
 
-/* =========================================================================
- * Put a short in the pending buffer. The 16-bit value is put in MSB order.
- * IN assertion: the stream state is correct and there is enough room in
- * pending_buf.
- */
-function putShortMSB(s, b) {
-//  put_byte(s, (Byte)(b >> 8));
-//  put_byte(s, (Byte)(b & 0xff));
-  s.pending_buf[s.pending++] = (b >>> 8) & 0xff;
-  s.pending_buf[s.pending++] = b & 0xff;
-}
+Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
+  // node::ParseEncoding() requires lower case.
+  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
+  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
+  this._writableState.defaultEncoding = encoding;
+};
 
+function decodeChunk(state, chunk, encoding) {
+  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
+    chunk = new Buffer(chunk, encoding);
+  }
+  return chunk;
+}
 
-/* ===========================================================================
- * Read a new buffer from the current input stream, update the adler32
- * and total number of bytes read.  All deflate() input goes through
- * this function so some applications may wish to modify it to avoid
- * allocating a large strm->input buffer and copying from it.
- * (See also flush_pending()).
- */
-function read_buf(strm, buf, start, size) {
-  var len = strm.avail_in;
+// if we're already writing something, then just put this
+// in the queue, and wait our turn.  Otherwise, call _write
+// If we return false, then we need a drain event, so set that flag.
+function writeOrBuffer(stream, state, chunk, encoding, cb) {
+  chunk = decodeChunk(state, chunk, encoding);
 
-  if (len > size) { len = size; }
-  if (len === 0) { return 0; }
+  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
+  var len = state.objectMode ? 1 : chunk.length;
 
-  strm.avail_in -= len;
+  state.length += len;
 
-  // zmemcpy(buf, strm->next_in, len);
-  utils.arraySet(buf, strm.input, strm.next_in, len, start);
-  if (strm.state.wrap === 1) {
-    strm.adler = adler32(strm.adler, buf, len, start);
-  }
+  var ret = state.length < state.highWaterMark;
+  // we must ensure that previous needDrain will not be reset to false.
+  if (!ret) state.needDrain = true;
 
-  else if (strm.state.wrap === 2) {
-    strm.adler = crc32(strm.adler, buf, len, start);
+  if (state.writing || state.corked) {
+    var last = state.lastBufferedRequest;
+    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
+    if (last) {
+      last.next = state.lastBufferedRequest;
+    } else {
+      state.bufferedRequest = state.lastBufferedRequest;
+    }
+    state.bufferedRequestCount += 1;
+  } else {
+    doWrite(stream, state, false, len, chunk, encoding, cb);
   }
 
-  strm.next_in += len;
-  strm.total_in += len;
+  return ret;
+}
 
-  return len;
+function doWrite(stream, state, writev, len, chunk, encoding, cb) {
+  state.writelen = len;
+  state.writecb = cb;
+  state.writing = true;
+  state.sync = true;
+  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
+  state.sync = false;
 }
 
+function onwriteError(stream, state, sync, er, cb) {
+  --state.pendingcb;
+  if (sync) processNextTick(cb, er);else cb(er);
 
-/* ===========================================================================
- * Set match_start to the longest match starting at the given string and
- * return its length. Matches shorter or equal to prev_length are discarded,
- * in which case the result is equal to prev_length and match_start is
- * garbage.
- * IN assertions: cur_match is the head of the hash chain for the current
- *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
- * OUT assertion: the match length is not greater than s->lookahead.
- */
-function longest_match(s, cur_match) {
-  var chain_length = s.max_chain_length;      /* max hash chain length */
-  var scan = s.strstart; /* current string */
-  var match;                       /* matched string */
-  var len;                           /* length of current match */
-  var best_len = s.prev_length;              /* best match length so far */
-  var nice_match = s.nice_match;             /* stop if match long enough */
-  var limit = (s.strstart > (s.w_size - MIN_LOOKAHEAD)) ?
-      s.strstart - (s.w_size - MIN_LOOKAHEAD) : 0/*NIL*/;
+  stream._writableState.errorEmitted = true;
+  stream.emit('error', er);
+}
 
-  var _win = s.window; // shortcut
+function onwriteStateUpdate(state) {
+  state.writing = false;
+  state.writecb = null;
+  state.length -= state.writelen;
+  state.writelen = 0;
+}
 
-  var wmask = s.w_mask;
-  var prev  = s.prev;
+function onwrite(stream, er) {
+  var state = stream._writableState;
+  var sync = state.sync;
+  var cb = state.writecb;
 
-  /* Stop when cur_match becomes <= limit. To simplify the code,
-   * we prevent matches with the string of window index 0.
-   */
+  onwriteStateUpdate(state);
 
-  var strend = s.strstart + MAX_MATCH;
-  var scan_end1  = _win[scan + best_len - 1];
-  var scan_end   = _win[scan + best_len];
+  if (er) onwriteError(stream, state, sync, er, cb);else {
+    // Check if we're actually ready to finish, but don't emit yet
+    var finished = needFinish(state);
 
-  /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
-   * It is easy to get rid of this optimization if necessary.
-   */
-  // Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
+    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
+      clearBuffer(stream, state);
+    }
 
-  /* Do not waste too much time if we already have a good match: */
-  if (s.prev_length >= s.good_match) {
-    chain_length >>= 2;
+    if (sync) {
+      /*<replacement>*/
+      asyncWrite(afterWrite, stream, state, finished, cb);
+      /*</replacement>*/
+    } else {
+        afterWrite(stream, state, finished, cb);
+      }
   }
-  /* Do not look for matches beyond the end of the input. This is necessary
-   * to make deflate deterministic.
-   */
-  if (nice_match > s.lookahead) { nice_match = s.lookahead; }
-
-  // Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
+}
 
-  do {
-    // Assert(cur_match < s->strstart, "no future");
-    match = cur_match;
+function afterWrite(stream, state, finished, cb) {
+  if (!finished) onwriteDrain(stream, state);
+  state.pendingcb--;
+  cb();
+  finishMaybe(stream, state);
+}
 
-    /* Skip to next match if the match length cannot increase
-     * or if the match length is less than 2.  Note that the checks below
-     * for insufficient lookahead only occur occasionally for performance
-     * reasons.  Therefore uninitialized memory will be accessed, and
-     * conditional jumps will be made that depend on those values.
-     * However the length of the match is limited to the lookahead, so
-     * the output of deflate is not affected by the uninitialized values.
-     */
+// Must force callback to be called on nextTick, so that we don't
+// emit 'drain' before the write() consumer gets the 'false' return
+// value, and has a chance to attach a 'drain' listener.
+function onwriteDrain(stream, state) {
+  if (state.length === 0 && state.needDrain) {
+    state.needDrain = false;
+    stream.emit('drain');
+  }
+}
 
-    if (_win[match + best_len]     !== scan_end  ||
-        _win[match + best_len - 1] !== scan_end1 ||
-        _win[match]                !== _win[scan] ||
-        _win[++match]              !== _win[scan + 1]) {
-      continue;
-    }
+// if there's something in the buffer waiting, then process it
+function clearBuffer(stream, state) {
+  state.bufferProcessing = true;
+  var entry = state.bufferedRequest;
 
-    /* The check at best_len-1 can be removed because it will be made
-     * again later. (This heuristic is not always a win.)
-     * It is not necessary to compare scan[2] and match[2] since they
-     * are always equal when the other bytes match, given that
-     * the hash keys are equal and that HASH_BITS >= 8.
-     */
-    scan += 2;
-    match++;
-    // Assert(*scan == *match, "match[2]?");
+  if (stream._writev && entry && entry.next) {
+    // Fast case, write everything using _writev()
+    var l = state.bufferedRequestCount;
+    var buffer = new Array(l);
+    var holder = state.corkedRequestsFree;
+    holder.entry = entry;
 
-    /* We check for insufficient lookahead only every 8th comparison;
-     * the 256th check will be made at strstart+258.
-     */
-    do {
-      /*jshint noempty:false*/
-    } while (_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
-             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
-             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
-             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
-             scan < strend);
+    var count = 0;
+    while (entry) {
+      buffer[count] = entry;
+      entry = entry.next;
+      count += 1;
+    }
 
-    // Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
+    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
 
-    len = MAX_MATCH - (strend - scan);
-    scan = strend - MAX_MATCH;
+    // doWrite is always async, defer these to save a bit of time
+    // as the hot path ends with doWrite
+    state.pendingcb++;
+    state.lastBufferedRequest = null;
+    state.corkedRequestsFree = holder.next;
+    holder.next = null;
+  } else {
+    // Slow case, write chunks one-by-one
+    while (entry) {
+      var chunk = entry.chunk;
+      var encoding = entry.encoding;
+      var cb = entry.callback;
+      var len = state.objectMode ? 1 : chunk.length;
 
-    if (len > best_len) {
-      s.match_start = cur_match;
-      best_len = len;
-      if (len >= nice_match) {
+      doWrite(stream, state, false, len, chunk, encoding, cb);
+      entry = entry.next;
+      // if we didn't call the onwrite immediately, then
+      // it means that we need to wait until it does.
+      // also, that means that the chunk and cb are currently
+      // being processed, so move the buffer counter past them.
+      if (state.writing) {
         break;
       }
-      scan_end1  = _win[scan + best_len - 1];
-      scan_end   = _win[scan + best_len];
     }
-  } while ((cur_match = prev[cur_match & wmask]) > limit && --chain_length !== 0);
 
-  if (best_len <= s.lookahead) {
-    return best_len;
+    if (entry === null) state.lastBufferedRequest = null;
   }
-  return s.lookahead;
+
+  state.bufferedRequestCount = 0;
+  state.bufferedRequest = entry;
+  state.bufferProcessing = false;
 }
 
+Writable.prototype._write = function (chunk, encoding, cb) {
+  cb(new Error('not implemented'));
+};
 
-/* ===========================================================================
- * Fill the window when the lookahead becomes insufficient.
- * Updates strstart and lookahead.
- *
- * IN assertion: lookahead < MIN_LOOKAHEAD
- * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
- *    At least one byte has been read, or avail_in == 0; reads are
- *    performed for at least two bytes (required for the zip translate_eol
- *    option -- not supported here).
- */
-function fill_window(s) {
-  var _w_size = s.w_size;
-  var p, n, m, more, str;
+Writable.prototype._writev = null;
 
-  //Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
+Writable.prototype.end = function (chunk, encoding, cb) {
+  var state = this._writableState;
 
-  do {
-    more = s.window_size - s.lookahead - s.strstart;
+  if (typeof chunk === 'function') {
+    cb = chunk;
+    chunk = null;
+    encoding = null;
+  } else if (typeof encoding === 'function') {
+    cb = encoding;
+    encoding = null;
+  }
 
-    // JS ints have 32 bit, block below not needed
-    /* Deal with !@#$% 64K limit: */
-    //if (sizeof(int) <= 2) {
-    //    if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
-    //        more = wsize;
-    //
-    //  } else if (more == (unsigned)(-1)) {
-    //        /* Very unlikely, but possible on 16 bit machine if
-    //         * strstart == 0 && lookahead == 1 (input done a byte at time)
-    //         */
-    //        more--;
-    //    }
-    //}
+  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
 
+  // .end() fully uncorks
+  if (state.corked) {
+    state.corked = 1;
+    this.uncork();
+  }
 
-    /* If the window is almost full and there is insufficient lookahead,
-     * move the upper half to the lower one to make room in the upper half.
-     */
-    if (s.strstart >= _w_size + (_w_size - MIN_LOOKAHEAD)) {
+  // ignore unnecessary end() calls.
+  if (!state.ending && !state.finished) endWritable(this, state, cb);
+};
 
-      utils.arraySet(s.window, s.window, _w_size, _w_size, 0);
-      s.match_start -= _w_size;
-      s.strstart -= _w_size;
-      /* we now have strstart >= MAX_DIST */
-      s.block_start -= _w_size;
+function needFinish(state) {
+  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
+}
 
-      /* Slide the hash table (could be avoided with 32 bit values
-       at the expense of memory usage). We slide even when level == 0
-       to keep the hash table consistent if we switch back to level > 0
-       later. (Using level 0 permanently is not an optimal usage of
-       zlib, so we don't care about this pathological case.)
-       */
+function prefinish(stream, state) {
+  if (!state.prefinished) {
+    state.prefinished = true;
+    stream.emit('prefinish');
+  }
+}
 
-      n = s.hash_size;
-      p = n;
-      do {
-        m = s.head[--p];
-        s.head[p] = (m >= _w_size ? m - _w_size : 0);
-      } while (--n);
+function finishMaybe(stream, state) {
+  var need = needFinish(state);
+  if (need) {
+    if (state.pendingcb === 0) {
+      prefinish(stream, state);
+      state.finished = true;
+      stream.emit('finish');
+    } else {
+      prefinish(stream, state);
+    }
+  }
+  return need;
+}
 
-      n = _w_size;
-      p = n;
-      do {
-        m = s.prev[--p];
-        s.prev[p] = (m >= _w_size ? m - _w_size : 0);
-        /* If n is not on any hash chain, prev[n] is garbage but
-         * its value will never be used.
-         */
-      } while (--n);
+function endWritable(stream, state, cb) {
+  state.ending = true;
+  finishMaybe(stream, state);
+  if (cb) {
+    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
+  }
+  state.ended = true;
+  stream.writable = false;
+}
 
-      more += _w_size;
+// It seems a linked list but it is not
+// there will be only 2 of these for each stream
+function CorkedRequest(state) {
+  var _this = this;
+
+  this.next = null;
+  this.entry = null;
+
+  this.finish = function (err) {
+    var entry = _this.entry;
+    _this.entry = null;
+    while (entry) {
+      var cb = entry.callback;
+      state.pendingcb--;
+      cb(err);
+      entry = entry.next;
     }
-    if (s.strm.avail_in === 0) {
-      break;
+    if (state.corkedRequestsFree) {
+      state.corkedRequestsFree.next = _this;
+    } else {
+      state.corkedRequestsFree = _this;
     }
+  };
+}
+}).call(this,_dereq_('_process'))
 
-    /* If there was no sliding:
-     *    strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
-     *    more == window_size - lookahead - strstart
-     * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
-     * => more >= window_size - 2*WSIZE + 2
-     * In the BIG_MEM or MMAP case (not yet supported),
-     *   window_size == input_size + MIN_LOOKAHEAD  &&
-     *   strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
-     * Otherwise, window_size == 2*WSIZE so more >= 2.
-     * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
-     */
-    //Assert(more >= 2, "more < 2");
-    n = read_buf(s.strm, s.window, s.strstart + s.lookahead, more);
-    s.lookahead += n;
-
-    /* Initialize the hash value now that we have some input: */
-    if (s.lookahead + s.insert >= MIN_MATCH) {
-      str = s.strstart - s.insert;
-      s.ins_h = s.window[str];
+},{"./_stream_duplex":158,"_process":184,"buffer":5,"core-util-is":70,"events":73,"inherits":94,"process-nextick-args":183,"util-deprecate":188}],163:[function(_dereq_,module,exports){
+var Stream = (function (){
+  try {
+    return _dereq_('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
+  } catch(_){}
+}());
+exports = module.exports = _dereq_('./lib/_stream_readable.js');
+exports.Stream = Stream || exports;
+exports.Readable = exports;
+exports.Writable = _dereq_('./lib/_stream_writable.js');
+exports.Duplex = _dereq_('./lib/_stream_duplex.js');
+exports.Transform = _dereq_('./lib/_stream_transform.js');
+exports.PassThrough = _dereq_('./lib/_stream_passthrough.js');
 
-      /* UPDATE_HASH(s, s->ins_h, s->window[str + 1]); */
-      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + 1]) & s.hash_mask;
-//#if MIN_MATCH != 3
-//        Call update_hash() MIN_MATCH-3 more times
-//#endif
-      while (s.insert) {
-        /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
-        s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;
+},{"./lib/_stream_duplex.js":158,"./lib/_stream_passthrough.js":159,"./lib/_stream_readable.js":160,"./lib/_stream_transform.js":161,"./lib/_stream_writable.js":162}],164:[function(_dereq_,module,exports){
+// Top level file is just a mixin of submodules & constants
+'use strict';
 
-        s.prev[str & s.w_mask] = s.head[s.ins_h];
-        s.head[s.ins_h] = str;
-        str++;
-        s.insert--;
-        if (s.lookahead + s.insert < MIN_MATCH) {
-          break;
-        }
-      }
-    }
-    /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
-     * but this is not important since only literal bytes will be emitted.
-     */
+var assign    = _dereq_('./lib/utils/common').assign;
 
-  } while (s.lookahead < MIN_LOOKAHEAD && s.strm.avail_in !== 0);
+var deflate   = _dereq_('./lib/deflate');
+var inflate   = _dereq_('./lib/inflate');
+var constants = _dereq_('./lib/zlib/constants');
 
-  /* If the WIN_INIT bytes after the end of the current data have never been
-   * written, then zero those bytes in order to avoid memory check reports of
-   * the use of uninitialized (or uninitialised as Julian writes) bytes by
-   * the longest match routines.  Update the high water mark for the next
-   * time through here.  WIN_INIT is set to MAX_MATCH since the longest match
-   * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
-   */
-//  if (s.high_water < s.window_size) {
-//    var curr = s.strstart + s.lookahead;
-//    var init = 0;
-//
-//    if (s.high_water < curr) {
-//      /* Previous high water mark below current data -- zero WIN_INIT
-//       * bytes or up to end of window, whichever is less.
-//       */
-//      init = s.window_size - curr;
-//      if (init > WIN_INIT)
-//        init = WIN_INIT;
-//      zmemzero(s->window + curr, (unsigned)init);
-//      s->high_water = curr + init;
-//    }
-//    else if (s->high_water < (ulg)curr + WIN_INIT) {
-//      /* High water mark at or above current data, but below current data
-//       * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
-//       * to end of window, whichever is less.
-//       */
-//      init = (ulg)curr + WIN_INIT - s->high_water;
-//      if (init > s->window_size - s->high_water)
-//        init = s->window_size - s->high_water;
-//      zmemzero(s->window + s->high_water, (unsigned)init);
-//      s->high_water += init;
-//    }
-//  }
-//
-//  Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
-//    "not enough room for search");
-}
+var pako = {};
 
-/* ===========================================================================
- * Copy without compression as much as possible from the input stream, return
- * the current block state.
- * This function does not insert new strings in the dictionary since
- * uncompressible data is probably not useful. This function is used
- * only for the level=0 compression option.
- * NOTE: this function should be optimized to avoid extra copying from
- * window to pending_buf.
- */
-function deflate_stored(s, flush) {
-  /* Stored blocks are limited to 0xffff bytes, pending_buf is limited
-   * to pending_buf_size, and each stored block has a 5 byte header:
-   */
-  var max_block_size = 0xffff;
+assign(pako, deflate, inflate, constants);
 
-  if (max_block_size > s.pending_buf_size - 5) {
-    max_block_size = s.pending_buf_size - 5;
-  }
+module.exports = pako;
 
-  /* Copy as much as possible from input to output: */
-  for (;;) {
-    /* Fill the window as much as possible: */
-    if (s.lookahead <= 1) {
+},{"./lib/deflate":165,"./lib/inflate":166,"./lib/utils/common":167,"./lib/zlib/constants":170}],165:[function(_dereq_,module,exports){
+'use strict';
 
-      //Assert(s->strstart < s->w_size+MAX_DIST(s) ||
-      //  s->block_start >= (long)s->w_size, "slide too late");
-//      if (!(s.strstart < s.w_size + (s.w_size - MIN_LOOKAHEAD) ||
-//        s.block_start >= s.w_size)) {
-//        throw  new Error("slide too late");
-//      }
 
-      fill_window(s);
-      if (s.lookahead === 0 && flush === Z_NO_FLUSH) {
-        return BS_NEED_MORE;
-      }
+var zlib_deflate = _dereq_('./zlib/deflate');
+var utils        = _dereq_('./utils/common');
+var strings      = _dereq_('./utils/strings');
+var msg          = _dereq_('./zlib/messages');
+var ZStream      = _dereq_('./zlib/zstream');
 
-      if (s.lookahead === 0) {
-        break;
-      }
-      /* flush the current block */
-    }
-    //Assert(s->block_start >= 0L, "block gone");
-//    if (s.block_start < 0) throw new Error("block gone");
+var toString = Object.prototype.toString;
 
-    s.strstart += s.lookahead;
-    s.lookahead = 0;
+/* Public constants ==========================================================*/
+/* ===========================================================================*/
 
-    /* Emit a stored block if pending_buf will be full: */
-    var max_start = s.block_start + max_block_size;
+var Z_NO_FLUSH      = 0;
+var Z_FINISH        = 4;
 
-    if (s.strstart === 0 || s.strstart >= max_start) {
-      /* strstart == 0 is possible when wraparound on 16-bit machine */
-      s.lookahead = s.strstart - max_start;
-      s.strstart = max_start;
-      /*** FLUSH_BLOCK(s, 0); ***/
-      flush_block_only(s, false);
-      if (s.strm.avail_out === 0) {
-        return BS_NEED_MORE;
-      }
-      /***/
+var Z_OK            = 0;
+var Z_STREAM_END    = 1;
+var Z_SYNC_FLUSH    = 2;
 
+var Z_DEFAULT_COMPRESSION = -1;
 
-    }
-    /* Flush if we may have to slide, otherwise block_start may become
-     * negative and the data will be gone:
-     */
-    if (s.strstart - s.block_start >= (s.w_size - MIN_LOOKAHEAD)) {
-      /*** FLUSH_BLOCK(s, 0); ***/
-      flush_block_only(s, false);
-      if (s.strm.avail_out === 0) {
-        return BS_NEED_MORE;
-      }
-      /***/
-    }
-  }
+var Z_DEFAULT_STRATEGY    = 0;
 
-  s.insert = 0;
+var Z_DEFLATED  = 8;
 
-  if (flush === Z_FINISH) {
-    /*** FLUSH_BLOCK(s, 1); ***/
-    flush_block_only(s, true);
-    if (s.strm.avail_out === 0) {
-      return BS_FINISH_STARTED;
-    }
-    /***/
-    return BS_FINISH_DONE;
-  }
+/* ===========================================================================*/
 
-  if (s.strstart > s.block_start) {
-    /*** FLUSH_BLOCK(s, 0); ***/
-    flush_block_only(s, false);
-    if (s.strm.avail_out === 0) {
-      return BS_NEED_MORE;
-    }
-    /***/
-  }
 
-  return BS_NEED_MORE;
-}
+/**
+ * class Deflate
+ *
+ * Generic JS-style wrapper for zlib calls. If you don't need
+ * streaming behaviour - use more simple functions: [[deflate]],
+ * [[deflateRaw]] and [[gzip]].
+ **/
 
-/* ===========================================================================
- * Compress as much as possible from the input stream, return the current
- * block state.
- * This function does not perform lazy evaluation of matches and inserts
- * new strings in the dictionary only for unmatched strings or for short
- * matches. It is used only for the fast compression options.
- */
-function deflate_fast(s, flush) {
-  var hash_head;        /* head of the hash chain */
-  var bflush;           /* set if current block must be flushed */
+/* internal
+ * Deflate.chunks -> Array
+ *
+ * Chunks of output data, if [[Deflate#onData]] not overriden.
+ **/
 
-  for (;;) {
-    /* Make sure that we always have enough lookahead, except
-     * at the end of the input file. We need MAX_MATCH bytes
-     * for the next match, plus MIN_MATCH bytes to insert the
-     * string following the next match.
-     */
-    if (s.lookahead < MIN_LOOKAHEAD) {
-      fill_window(s);
-      if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
-        return BS_NEED_MORE;
-      }
-      if (s.lookahead === 0) {
-        break; /* flush the current block */
-      }
-    }
+/**
+ * Deflate.result -> Uint8Array|Array
+ *
+ * Compressed result, generated by default [[Deflate#onData]]
+ * and [[Deflate#onEnd]] handlers. Filled after you push last chunk
+ * (call [[Deflate#push]] with `Z_FINISH` / `true` param)  or if you
+ * push a chunk with explicit flush (call [[Deflate#push]] with
+ * `Z_SYNC_FLUSH` param).
+ **/
 
-    /* Insert the string window[strstart .. strstart+2] in the
-     * dictionary, and set hash_head to the head of the hash chain:
-     */
-    hash_head = 0/*NIL*/;
-    if (s.lookahead >= MIN_MATCH) {
-      /*** INSERT_STRING(s, s.strstart, hash_head); ***/
-      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
-      hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
-      s.head[s.ins_h] = s.strstart;
-      /***/
-    }
+/**
+ * Deflate.err -> Number
+ *
+ * Error code after deflate finished. 0 (Z_OK) on success.
+ * You will not need it in real life, because deflate errors
+ * are possible only on wrong options or bad `onData` / `onEnd`
+ * custom handlers.
+ **/
 
-    /* Find the longest match, discarding those <= prev_length.
-     * At this point we have always match_length < MIN_MATCH
-     */
-    if (hash_head !== 0/*NIL*/ && ((s.strstart - hash_head) <= (s.w_size - MIN_LOOKAHEAD))) {
-      /* To simplify the code, we prevent matches with the string
-       * of window index 0 (in particular we have to avoid a match
-       * of the string with itself at the start of the input file).
-       */
-      s.match_length = longest_match(s, hash_head);
-      /* longest_match() sets match_start */
-    }
-    if (s.match_length >= MIN_MATCH) {
-      // check_match(s, s.strstart, s.match_start, s.match_length); // for debug only
+/**
+ * Deflate.msg -> String
+ *
+ * Error message, if [[Deflate.err]] != 0
+ **/
 
-      /*** _tr_tally_dist(s, s.strstart - s.match_start,
-                     s.match_length - MIN_MATCH, bflush); ***/
-      bflush = trees._tr_tally(s, s.strstart - s.match_start, s.match_length - MIN_MATCH);
 
-      s.lookahead -= s.match_length;
+/**
+ * new Deflate(options)
+ * - options (Object): zlib deflate options.
+ *
+ * Creates new deflator instance with specified params. Throws exception
+ * on bad params. Supported options:
+ *
+ * - `level`
+ * - `windowBits`
+ * - `memLevel`
+ * - `strategy`
+ * - `dictionary`
+ *
+ * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
+ * for more information on these.
+ *
+ * Additional options, for internal needs:
+ *
+ * - `chunkSize` - size of generated data chunks (16K by default)
+ * - `raw` (Boolean) - do raw deflate
+ * - `gzip` (Boolean) - create gzip wrapper
+ * - `to` (String) - if equal to 'string', then result will be "binary string"
+ *    (each char code [0..255])
+ * - `header` (Object) - custom header for gzip
+ *   - `text` (Boolean) - true if compressed data believed to be text
+ *   - `time` (Number) - modification time, unix timestamp
+ *   - `os` (Number) - operation system code
+ *   - `extra` (Array) - array of bytes with extra data (max 65536)
+ *   - `name` (String) - file name (binary string)
+ *   - `comment` (String) - comment (binary string)
+ *   - `hcrc` (Boolean) - true if header crc should be added
+ *
+ * ##### Example:
+ *
+ * ```javascript
+ * var pako = require('pako')
+ *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])
+ *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);
+ *
+ * var deflate = new pako.Deflate({ level: 3});
+ *
+ * deflate.push(chunk1, false);
+ * deflate.push(chunk2, true);  // true -> last chunk
+ *
+ * if (deflate.err) { throw new Error(deflate.err); }
+ *
+ * console.log(deflate.result);
+ * ```
+ **/
+function Deflate(options) {
+  if (!(this instanceof Deflate)) return new Deflate(options);
 
-      /* Insert new strings in the hash table only if the match length
-       * is not too large. This saves time but degrades compression.
-       */
-      if (s.match_length <= s.max_lazy_match/*max_insert_length*/ && s.lookahead >= MIN_MATCH) {
-        s.match_length--; /* string at strstart already in table */
-        do {
-          s.strstart++;
-          /*** INSERT_STRING(s, s.strstart, hash_head); ***/
-          s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
-          hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
-          s.head[s.ins_h] = s.strstart;
-          /***/
-          /* strstart never exceeds WSIZE-MAX_MATCH, so there are
-           * always MIN_MATCH bytes ahead.
-           */
-        } while (--s.match_length !== 0);
-        s.strstart++;
-      } else
-      {
-        s.strstart += s.match_length;
-        s.match_length = 0;
-        s.ins_h = s.window[s.strstart];
-        /* UPDATE_HASH(s, s.ins_h, s.window[s.strstart+1]); */
-        s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + 1]) & s.hash_mask;
+  this.options = utils.assign({
+    level: Z_DEFAULT_COMPRESSION,
+    method: Z_DEFLATED,
+    chunkSize: 16384,
+    windowBits: 15,
+    memLevel: 8,
+    strategy: Z_DEFAULT_STRATEGY,
+    to: ''
+  }, options || {});
 
-//#if MIN_MATCH != 3
-//                Call UPDATE_HASH() MIN_MATCH-3 more times
-//#endif
-        /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
-         * matter since it will be recomputed at next deflate call.
-         */
-      }
-    } else {
-      /* No match, output a literal byte */
-      //Tracevv((stderr,"%c", s.window[s.strstart]));
-      /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
-      bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
+  var opt = this.options;
 
-      s.lookahead--;
-      s.strstart++;
-    }
-    if (bflush) {
-      /*** FLUSH_BLOCK(s, 0); ***/
-      flush_block_only(s, false);
-      if (s.strm.avail_out === 0) {
-        return BS_NEED_MORE;
-      }
-      /***/
-    }
-  }
-  s.insert = ((s.strstart < (MIN_MATCH - 1)) ? s.strstart : MIN_MATCH - 1);
-  if (flush === Z_FINISH) {
-    /*** FLUSH_BLOCK(s, 1); ***/
-    flush_block_only(s, true);
-    if (s.strm.avail_out === 0) {
-      return BS_FINISH_STARTED;
-    }
-    /***/
-    return BS_FINISH_DONE;
+  if (opt.raw && (opt.windowBits > 0)) {
+    opt.windowBits = -opt.windowBits;
   }
-  if (s.last_lit) {
-    /*** FLUSH_BLOCK(s, 0); ***/
-    flush_block_only(s, false);
-    if (s.strm.avail_out === 0) {
-      return BS_NEED_MORE;
-    }
-    /***/
+
+  else if (opt.gzip && (opt.windowBits > 0) && (opt.windowBits < 16)) {
+    opt.windowBits += 16;
   }
-  return BS_BLOCK_DONE;
-}
 
-/* ===========================================================================
- * Same as above, but achieves better compression. We use a lazy
- * evaluation for matches: a match is finally adopted only if there is
- * no better match at the next window position.
- */
-function deflate_slow(s, flush) {
-  var hash_head;          /* head of hash chain */
-  var bflush;              /* set if current block must be flushed */
+  this.err    = 0;      // error code, if happens (0 = Z_OK)
+  this.msg    = '';     // error message
+  this.ended  = false;  // used to avoid multiple onEnd() calls
+  this.chunks = [];     // chunks of compressed data
 
-  var max_insert;
+  this.strm = new ZStream();
+  this.strm.avail_out = 0;
 
-  /* Process the input block. */
-  for (;;) {
-    /* Make sure that we always have enough lookahead, except
-     * at the end of the input file. We need MAX_MATCH bytes
-     * for the next match, plus MIN_MATCH bytes to insert the
-     * string following the next match.
-     */
-    if (s.lookahead < MIN_LOOKAHEAD) {
-      fill_window(s);
-      if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
-        return BS_NEED_MORE;
-      }
-      if (s.lookahead === 0) { break; } /* flush the current block */
-    }
+  var status = zlib_deflate.deflateInit2(
+    this.strm,
+    opt.level,
+    opt.method,
+    opt.windowBits,
+    opt.memLevel,
+    opt.strategy
+  );
 
-    /* Insert the string window[strstart .. strstart+2] in the
-     * dictionary, and set hash_head to the head of the hash chain:
-     */
-    hash_head = 0/*NIL*/;
-    if (s.lookahead >= MIN_MATCH) {
-      /*** INSERT_STRING(s, s.strstart, hash_head); ***/
-      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
-      hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
-      s.head[s.ins_h] = s.strstart;
-      /***/
-    }
+  if (status !== Z_OK) {
+    throw new Error(msg[status]);
+  }
 
-    /* Find the longest match, discarding those <= prev_length.
-     */
-    s.prev_length = s.match_length;
-    s.prev_match = s.match_start;
-    s.match_length = MIN_MATCH - 1;
+  if (opt.header) {
+    zlib_deflate.deflateSetHeader(this.strm, opt.header);
+  }
 
-    if (hash_head !== 0/*NIL*/ && s.prev_length < s.max_lazy_match &&
-        s.strstart - hash_head <= (s.w_size - MIN_LOOKAHEAD)/*MAX_DIST(s)*/) {
-      /* To simplify the code, we prevent matches with the string
-       * of window index 0 (in particular we have to avoid a match
-       * of the string with itself at the start of the input file).
-       */
-      s.match_length = longest_match(s, hash_head);
-      /* longest_match() sets match_start */
+  if (opt.dictionary) {
+    var dict;
+    // Convert data if needed
+    if (typeof opt.dictionary === 'string') {
+      // If we need to compress text, change encoding to utf8.
+      dict = strings.string2buf(opt.dictionary);
+    } else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {
+      dict = new Uint8Array(opt.dictionary);
+    } else {
+      dict = opt.dictionary;
+    }
 
-      if (s.match_length <= 5 &&
-         (s.strategy === Z_FILTERED || (s.match_length === MIN_MATCH && s.strstart - s.match_start > 4096/*TOO_FAR*/))) {
+    status = zlib_deflate.deflateSetDictionary(this.strm, dict);
 
-        /* If prev_match is also MIN_MATCH, match_start is garbage
-         * but we will ignore the current match anyway.
-         */
-        s.match_length = MIN_MATCH - 1;
-      }
+    if (status !== Z_OK) {
+      throw new Error(msg[status]);
     }
-    /* If there was a match at the previous step and the current
-     * match is not better, output the previous match:
-     */
-    if (s.prev_length >= MIN_MATCH && s.match_length <= s.prev_length) {
-      max_insert = s.strstart + s.lookahead - MIN_MATCH;
-      /* Do not insert strings in hash table beyond this. */
 
-      //check_match(s, s.strstart-1, s.prev_match, s.prev_length);
-
-      /***_tr_tally_dist(s, s.strstart - 1 - s.prev_match,
-                     s.prev_length - MIN_MATCH, bflush);***/
-      bflush = trees._tr_tally(s, s.strstart - 1 - s.prev_match, s.prev_length - MIN_MATCH);
-      /* Insert in hash table all strings up to the end of the match.
-       * strstart-1 and strstart are already inserted. If there is not
-       * enough lookahead, the last two strings are not inserted in
-       * the hash table.
-       */
-      s.lookahead -= s.prev_length - 1;
-      s.prev_length -= 2;
-      do {
-        if (++s.strstart <= max_insert) {
-          /*** INSERT_STRING(s, s.strstart, hash_head); ***/
-          s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
-          hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
-          s.head[s.ins_h] = s.strstart;
-          /***/
-        }
-      } while (--s.prev_length !== 0);
-      s.match_available = 0;
-      s.match_length = MIN_MATCH - 1;
-      s.strstart++;
-
-      if (bflush) {
-        /*** FLUSH_BLOCK(s, 0); ***/
-        flush_block_only(s, false);
-        if (s.strm.avail_out === 0) {
-          return BS_NEED_MORE;
-        }
-        /***/
-      }
-
-    } else if (s.match_available) {
-      /* If there was no match at the previous position, output a
-       * single literal. If there was a match but the current match
-       * is longer, truncate the previous match to a single literal.
-       */
-      //Tracevv((stderr,"%c", s->window[s->strstart-1]));
-      /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
-      bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]);
-
-      if (bflush) {
-        /*** FLUSH_BLOCK_ONLY(s, 0) ***/
-        flush_block_only(s, false);
-        /***/
-      }
-      s.strstart++;
-      s.lookahead--;
-      if (s.strm.avail_out === 0) {
-        return BS_NEED_MORE;
-      }
-    } else {
-      /* There is no previous match to compare with, wait for
-       * the next step to decide.
-       */
-      s.match_available = 1;
-      s.strstart++;
-      s.lookahead--;
-    }
+    this._dict_set = true;
   }
-  //Assert (flush != Z_NO_FLUSH, "no flush?");
-  if (s.match_available) {
-    //Tracevv((stderr,"%c", s->window[s->strstart-1]));
-    /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
-    bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]);
+}
 
-    s.match_available = 0;
-  }
-  s.insert = s.strstart < MIN_MATCH - 1 ? s.strstart : MIN_MATCH - 1;
-  if (flush === Z_FINISH) {
-    /*** FLUSH_BLOCK(s, 1); ***/
-    flush_block_only(s, true);
-    if (s.strm.avail_out === 0) {
-      return BS_FINISH_STARTED;
-    }
-    /***/
-    return BS_FINISH_DONE;
-  }
-  if (s.last_lit) {
-    /*** FLUSH_BLOCK(s, 0); ***/
-    flush_block_only(s, false);
-    if (s.strm.avail_out === 0) {
-      return BS_NEED_MORE;
-    }
-    /***/
-  }
+/**
+ * Deflate#push(data[, mode]) -> Boolean
+ * - data (Uint8Array|Array|ArrayBuffer|String): input data. Strings will be
+ *   converted to utf8 byte sequence.
+ * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.
+ *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.
+ *
+ * Sends input data to deflate pipe, generating [[Deflate#onData]] calls with
+ * new compressed chunks. Returns `true` on success. The last data block must have
+ * mode Z_FINISH (or `true`). That will flush internal pending buffers and call
+ * [[Deflate#onEnd]]. For interim explicit flushes (without ending the stream) you
+ * can use mode Z_SYNC_FLUSH, keeping the compression context.
+ *
+ * On fail call [[Deflate#onEnd]] with error code and return false.
+ *
+ * We strongly recommend to use `Uint8Array` on input for best speed (output
+ * array format is detected automatically). Also, don't skip last param and always
+ * use the same type in your code (boolean or number). That will improve JS speed.
+ *
+ * For regular `Array`-s make sure all elements are [0..255].
+ *
+ * ##### Example
+ *
+ * ```javascript
+ * push(chunk, false); // push one of data chunks
+ * ...
+ * push(chunk, true);  // push last chunk
+ * ```
+ **/
+Deflate.prototype.push = function (data, mode) {
+  var strm = this.strm;
+  var chunkSize = this.options.chunkSize;
+  var status, _mode;
 
-  return BS_BLOCK_DONE;
-}
+  if (this.ended) { return false; }
 
+  _mode = (mode === ~~mode) ? mode : ((mode === true) ? Z_FINISH : Z_NO_FLUSH);
 
-/* ===========================================================================
- * For Z_RLE, simply look for runs of bytes, generate matches only of distance
- * one.  Do not maintain a hash table.  (It will be regenerated if this run of
- * deflate switches away from Z_RLE.)
- */
-function deflate_rle(s, flush) {
-  var bflush;            /* set if current block must be flushed */
-  var prev;              /* byte at distance one to match */
-  var scan, strend;      /* scan goes up to strend for length of run */
+  // Convert data if needed
+  if (typeof data === 'string') {
+    // If we need to compress text, change encoding to utf8.
+    strm.input = strings.string2buf(data);
+  } else if (toString.call(data) === '[object ArrayBuffer]') {
+    strm.input = new Uint8Array(data);
+  } else {
+    strm.input = data;
+  }
 
-  var _win = s.window;
+  strm.next_in = 0;
+  strm.avail_in = strm.input.length;
 
-  for (;;) {
-    /* Make sure that we always have enough lookahead, except
-     * at the end of the input file. We need MAX_MATCH bytes
-     * for the longest run, plus one for the unrolled loop.
-     */
-    if (s.lookahead <= MAX_MATCH) {
-      fill_window(s);
-      if (s.lookahead <= MAX_MATCH && flush === Z_NO_FLUSH) {
-        return BS_NEED_MORE;
-      }
-      if (s.lookahead === 0) { break; } /* flush the current block */
+  do {
+    if (strm.avail_out === 0) {
+      strm.output = new utils.Buf8(chunkSize);
+      strm.next_out = 0;
+      strm.avail_out = chunkSize;
     }
+    status = zlib_deflate.deflate(strm, _mode);    /* no bad return value */
 
-    /* See how many times the previous byte repeats */
-    s.match_length = 0;
-    if (s.lookahead >= MIN_MATCH && s.strstart > 0) {
-      scan = s.strstart - 1;
-      prev = _win[scan];
-      if (prev === _win[++scan] && prev === _win[++scan] && prev === _win[++scan]) {
-        strend = s.strstart + MAX_MATCH;
-        do {
-          /*jshint noempty:false*/
-        } while (prev === _win[++scan] && prev === _win[++scan] &&
-                 prev === _win[++scan] && prev === _win[++scan] &&
-                 prev === _win[++scan] && prev === _win[++scan] &&
-                 prev === _win[++scan] && prev === _win[++scan] &&
-                 scan < strend);
-        s.match_length = MAX_MATCH - (strend - scan);
-        if (s.match_length > s.lookahead) {
-          s.match_length = s.lookahead;
-        }
+    if (status !== Z_STREAM_END && status !== Z_OK) {
+      this.onEnd(status);
+      this.ended = true;
+      return false;
+    }
+    if (strm.avail_out === 0 || (strm.avail_in === 0 && (_mode === Z_FINISH || _mode === Z_SYNC_FLUSH))) {
+      if (this.options.to === 'string') {
+        this.onData(strings.buf2binstring(utils.shrinkBuf(strm.output, strm.next_out)));
+      } else {
+        this.onData(utils.shrinkBuf(strm.output, strm.next_out));
       }
-      //Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
     }
+  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== Z_STREAM_END);
 
-    /* Emit match if have run of MIN_MATCH or longer, else emit literal */
-    if (s.match_length >= MIN_MATCH) {
-      //check_match(s, s.strstart, s.strstart - 1, s.match_length);
+  // Finalize on the last chunk.
+  if (_mode === Z_FINISH) {
+    status = zlib_deflate.deflateEnd(this.strm);
+    this.onEnd(status);
+    this.ended = true;
+    return status === Z_OK;
+  }
 
-      /*** _tr_tally_dist(s, 1, s.match_length - MIN_MATCH, bflush); ***/
-      bflush = trees._tr_tally(s, 1, s.match_length - MIN_MATCH);
+  // callback interim results if Z_SYNC_FLUSH.
+  if (_mode === Z_SYNC_FLUSH) {
+    this.onEnd(Z_OK);
+    strm.avail_out = 0;
+    return true;
+  }
 
-      s.lookahead -= s.match_length;
-      s.strstart += s.match_length;
-      s.match_length = 0;
-    } else {
-      /* No match, output a literal byte */
-      //Tracevv((stderr,"%c", s->window[s->strstart]));
-      /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
-      bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
+  return true;
+};
 
-      s.lookahead--;
-      s.strstart++;
-    }
-    if (bflush) {
-      /*** FLUSH_BLOCK(s, 0); ***/
-      flush_block_only(s, false);
-      if (s.strm.avail_out === 0) {
-        return BS_NEED_MORE;
-      }
-      /***/
-    }
-  }
-  s.insert = 0;
-  if (flush === Z_FINISH) {
-    /*** FLUSH_BLOCK(s, 1); ***/
-    flush_block_only(s, true);
-    if (s.strm.avail_out === 0) {
-      return BS_FINISH_STARTED;
-    }
-    /***/
-    return BS_FINISH_DONE;
-  }
-  if (s.last_lit) {
-    /*** FLUSH_BLOCK(s, 0); ***/
-    flush_block_only(s, false);
-    if (s.strm.avail_out === 0) {
-      return BS_NEED_MORE;
-    }
-    /***/
-  }
-  return BS_BLOCK_DONE;
-}
 
-/* ===========================================================================
- * For Z_HUFFMAN_ONLY, do not look for matches.  Do not maintain a hash table.
- * (It will be regenerated if this run of deflate switches away from Huffman.)
- */
-function deflate_huff(s, flush) {
-  var bflush;             /* set if current block must be flushed */
+/**
+ * Deflate#onData(chunk) -> Void
+ * - chunk (Uint8Array|Array|String): ouput data. Type of array depends
+ *   on js engine support. When string output requested, each chunk
+ *   will be string.
+ *
+ * By default, stores data blocks in `chunks[]` property and glue
+ * those in `onEnd`. Override this handler, if you need another behaviour.
+ **/
+Deflate.prototype.onData = function (chunk) {
+  this.chunks.push(chunk);
+};
 
-  for (;;) {
-    /* Make sure that we have a literal to write. */
-    if (s.lookahead === 0) {
-      fill_window(s);
-      if (s.lookahead === 0) {
-        if (flush === Z_NO_FLUSH) {
-          return BS_NEED_MORE;
-        }
-        break;      /* flush the current block */
-      }
-    }
 
-    /* Output a literal byte */
-    s.match_length = 0;
-    //Tracevv((stderr,"%c", s->window[s->strstart]));
-    /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
-    bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
-    s.lookahead--;
-    s.strstart++;
-    if (bflush) {
-      /*** FLUSH_BLOCK(s, 0); ***/
-      flush_block_only(s, false);
-      if (s.strm.avail_out === 0) {
-        return BS_NEED_MORE;
-      }
-      /***/
-    }
-  }
-  s.insert = 0;
-  if (flush === Z_FINISH) {
-    /*** FLUSH_BLOCK(s, 1); ***/
-    flush_block_only(s, true);
-    if (s.strm.avail_out === 0) {
-      return BS_FINISH_STARTED;
-    }
-    /***/
-    return BS_FINISH_DONE;
-  }
-  if (s.last_lit) {
-    /*** FLUSH_BLOCK(s, 0); ***/
-    flush_block_only(s, false);
-    if (s.strm.avail_out === 0) {
-      return BS_NEED_MORE;
+/**
+ * Deflate#onEnd(status) -> Void
+ * - status (Number): deflate status. 0 (Z_OK) on success,
+ *   other if not.
+ *
+ * Called once after you tell deflate that the input stream is
+ * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)
+ * or if an error happened. By default - join collected chunks,
+ * free memory and fill `results` / `err` properties.
+ **/
+Deflate.prototype.onEnd = function (status) {
+  // On success - join
+  if (status === Z_OK) {
+    if (this.options.to === 'string') {
+      this.result = this.chunks.join('');
+    } else {
+      this.result = utils.flattenChunks(this.chunks);
     }
-    /***/
   }
-  return BS_BLOCK_DONE;
-}
+  this.chunks = [];
+  this.err = status;
+  this.msg = this.strm.msg;
+};
 
-/* Values for max_lazy_match, good_match and max_chain_length, depending on
- * the desired pack level (0..9). The values given below have been tuned to
- * exclude worst case performance for pathological files. Better values may be
- * found for specific files.
- */
-function Config(good_length, max_lazy, nice_length, max_chain, func) {
-  this.good_length = good_length;
-  this.max_lazy = max_lazy;
-  this.nice_length = nice_length;
-  this.max_chain = max_chain;
-  this.func = func;
-}
 
-var configuration_table;
+/**
+ * deflate(data[, options]) -> Uint8Array|Array|String
+ * - data (Uint8Array|Array|String): input data to compress.
+ * - options (Object): zlib deflate options.
+ *
+ * Compress `data` with deflate algorithm and `options`.
+ *
+ * Supported options are:
+ *
+ * - level
+ * - windowBits
+ * - memLevel
+ * - strategy
+ * - dictionary
+ *
+ * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
+ * for more information on these.
+ *
+ * Sugar (options):
+ *
+ * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify
+ *   negative windowBits implicitly.
+ * - `to` (String) - if equal to 'string', then result will be "binary string"
+ *    (each char code [0..255])
+ *
+ * ##### Example:
+ *
+ * ```javascript
+ * var pako = require('pako')
+ *   , data = Uint8Array([1,2,3,4,5,6,7,8,9]);
+ *
+ * console.log(pako.deflate(data));
+ * ```
+ **/
+function deflate(input, options) {
+  var deflator = new Deflate(options);
 
-configuration_table = [
-  /*      good lazy nice chain */
-  new Config(0, 0, 0, 0, deflate_stored),          /* 0 store only */
-  new Config(4, 4, 8, 4, deflate_fast),            /* 1 max speed, no lazy matches */
-  new Config(4, 5, 16, 8, deflate_fast),           /* 2 */
-  new Config(4, 6, 32, 32, deflate_fast),          /* 3 */
+  deflator.push(input, true);
 
-  new Config(4, 4, 16, 16, deflate_slow),          /* 4 lazy matches */
-  new Config(8, 16, 32, 32, deflate_slow),         /* 5 */
-  new Config(8, 16, 128, 128, deflate_slow),       /* 6 */
-  new Config(8, 32, 128, 256, deflate_slow),       /* 7 */
-  new Config(32, 128, 258, 1024, deflate_slow),    /* 8 */
-  new Config(32, 258, 258, 4096, deflate_slow)     /* 9 max compression */
-];
+  // That will never happens, if you don't cheat with options :)
+  if (deflator.err) { throw deflator.msg; }
 
+  return deflator.result;
+}
 
-/* ===========================================================================
- * Initialize the "longest match" routines for a new zlib stream
- */
-function lm_init(s) {
-  s.window_size = 2 * s.w_size;
 
-  /*** CLEAR_HASH(s); ***/
-  zero(s.head); // Fill with NIL (= 0);
+/**
+ * deflateRaw(data[, options]) -> Uint8Array|Array|String
+ * - data (Uint8Array|Array|String): input data to compress.
+ * - options (Object): zlib deflate options.
+ *
+ * The same as [[deflate]], but creates raw data, without wrapper
+ * (header and adler32 crc).
+ **/
+function deflateRaw(input, options) {
+  options = options || {};
+  options.raw = true;
+  return deflate(input, options);
+}
 
-  /* Set the default configuration parameters:
-   */
-  s.max_lazy_match = configuration_table[s.level].max_lazy;
-  s.good_match = configuration_table[s.level].good_length;
-  s.nice_match = configuration_table[s.level].nice_length;
-  s.max_chain_length = configuration_table[s.level].max_chain;
 
-  s.strstart = 0;
-  s.block_start = 0;
-  s.lookahead = 0;
-  s.insert = 0;
-  s.match_length = s.prev_length = MIN_MATCH - 1;
-  s.match_available = 0;
-  s.ins_h = 0;
+/**
+ * gzip(data[, options]) -> Uint8Array|Array|String
+ * - data (Uint8Array|Array|String): input data to compress.
+ * - options (Object): zlib deflate options.
+ *
+ * The same as [[deflate]], but create gzip wrapper instead of
+ * deflate one.
+ **/
+function gzip(input, options) {
+  options = options || {};
+  options.gzip = true;
+  return deflate(input, options);
 }
 
 
-function DeflateState() {
-  this.strm = null;            /* pointer back to this zlib stream */
-  this.status = 0;            /* as the name implies */
-  this.pending_buf = null;      /* output still pending */
-  this.pending_buf_size = 0;  /* size of pending_buf */
-  this.pending_out = 0;       /* next pending byte to output to the stream */
-  this.pending = 0;           /* nb of bytes in the pending buffer */
-  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */
-  this.gzhead = null;         /* gzip header information to write */
-  this.gzindex = 0;           /* where in extra, name, or comment */
-  this.method = Z_DEFLATED; /* can only be DEFLATED */
-  this.last_flush = -1;   /* value of flush param for previous deflate call */
+exports.Deflate = Deflate;
+exports.deflate = deflate;
+exports.deflateRaw = deflateRaw;
+exports.gzip = gzip;
 
-  this.w_size = 0;  /* LZ77 window size (32K by default) */
-  this.w_bits = 0;  /* log2(w_size)  (8..16) */
-  this.w_mask = 0;  /* w_size - 1 */
+},{"./utils/common":167,"./utils/strings":168,"./zlib/deflate":172,"./zlib/messages":177,"./zlib/zstream":179}],166:[function(_dereq_,module,exports){
+'use strict';
 
-  this.window = null;
-  /* Sliding window. Input bytes are read into the second half of the window,
-   * and move to the first half later to keep a dictionary of at least wSize
-   * bytes. With this organization, matches are limited to a distance of
-   * wSize-MAX_MATCH bytes, but this ensures that IO is always
-   * performed with a length multiple of the block size.
-   */
 
-  this.window_size = 0;
-  /* Actual size of window: 2*wSize, except when the user input buffer
-   * is directly used as sliding window.
-   */
+var zlib_inflate = _dereq_('./zlib/inflate');
+var utils        = _dereq_('./utils/common');
+var strings      = _dereq_('./utils/strings');
+var c            = _dereq_('./zlib/constants');
+var msg          = _dereq_('./zlib/messages');
+var ZStream      = _dereq_('./zlib/zstream');
+var GZheader     = _dereq_('./zlib/gzheader');
 
-  this.prev = null;
-  /* Link to older string with same hash index. To limit the size of this
-   * array to 64K, this link is maintained only for the last 32K strings.
-   * An index in this array is thus a window index modulo 32K.
-   */
+var toString = Object.prototype.toString;
 
-  this.head = null;   /* Heads of the hash chains or NIL. */
+/**
+ * class Inflate
+ *
+ * Generic JS-style wrapper for zlib calls. If you don't need
+ * streaming behaviour - use more simple functions: [[inflate]]
+ * and [[inflateRaw]].
+ **/
 
-  this.ins_h = 0;       /* hash index of string to be inserted */
-  this.hash_size = 0;   /* number of elements in hash table */
-  this.hash_bits = 0;   /* log2(hash_size) */
-  this.hash_mask = 0;   /* hash_size-1 */
+/* internal
+ * inflate.chunks -> Array
+ *
+ * Chunks of output data, if [[Inflate#onData]] not overriden.
+ **/
 
-  this.hash_shift = 0;
-  /* Number of bits by which ins_h must be shifted at each input
-   * step. It must be such that after MIN_MATCH steps, the oldest
-   * byte no longer takes part in the hash key, that is:
-   *   hash_shift * MIN_MATCH >= hash_bits
-   */
+/**
+ * Inflate.result -> Uint8Array|Array|String
+ *
+ * Uncompressed result, generated by default [[Inflate#onData]]
+ * and [[Inflate#onEnd]] handlers. Filled after you push last chunk
+ * (call [[Inflate#push]] with `Z_FINISH` / `true` param) or if you
+ * push a chunk with explicit flush (call [[Inflate#push]] with
+ * `Z_SYNC_FLUSH` param).
+ **/
 
-  this.block_start = 0;
-  /* Window position at the beginning of the current output block. Gets
-   * negative when the window is moved backwards.
-   */
+/**
+ * Inflate.err -> Number
+ *
+ * Error code after inflate finished. 0 (Z_OK) on success.
+ * Should be checked if broken data possible.
+ **/
 
-  this.match_length = 0;      /* length of best match */
-  this.prev_match = 0;        /* previous match */
-  this.match_available = 0;   /* set if previous match exists */
-  this.strstart = 0;          /* start of string to insert */
-  this.match_start = 0;       /* start of matching string */
-  this.lookahead = 0;         /* number of valid bytes ahead in window */
+/**
+ * Inflate.msg -> String
+ *
+ * Error message, if [[Inflate.err]] != 0
+ **/
 
-  this.prev_length = 0;
-  /* Length of the best match at previous step. Matches not greater than this
-   * are discarded. This is used in the lazy match evaluation.
-   */
 
-  this.max_chain_length = 0;
-  /* To speed up deflation, hash chains are never searched beyond this
-   * length.  A higher limit improves compression ratio but degrades the
-   * speed.
-   */
+/**
+ * new Inflate(options)
+ * - options (Object): zlib inflate options.
+ *
+ * Creates new inflator instance with specified params. Throws exception
+ * on bad params. Supported options:
+ *
+ * - `windowBits`
+ * - `dictionary`
+ *
+ * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
+ * for more information on these.
+ *
+ * Additional options, for internal needs:
+ *
+ * - `chunkSize` - size of generated data chunks (16K by default)
+ * - `raw` (Boolean) - do raw inflate
+ * - `to` (String) - if equal to 'string', then result will be converted
+ *   from utf8 to utf16 (javascript) string. When string output requested,
+ *   chunk length can differ from `chunkSize`, depending on content.
+ *
+ * By default, when no options set, autodetect deflate/gzip data format via
+ * wrapper header.
+ *
+ * ##### Example:
+ *
+ * ```javascript
+ * var pako = require('pako')
+ *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])
+ *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);
+ *
+ * var inflate = new pako.Inflate({ level: 3});
+ *
+ * inflate.push(chunk1, false);
+ * inflate.push(chunk2, true);  // true -> last chunk
+ *
+ * if (inflate.err) { throw new Error(inflate.err); }
+ *
+ * console.log(inflate.result);
+ * ```
+ **/
+function Inflate(options) {
+  if (!(this instanceof Inflate)) return new Inflate(options);
 
-  this.max_lazy_match = 0;
-  /* Attempt to find a better match only when the current match is strictly
-   * smaller than this value. This mechanism is used only for compression
-   * levels >= 4.
-   */
-  // That's alias to max_lazy_match, don't use directly
-  //this.max_insert_length = 0;
-  /* Insert new strings in the hash table only if the match length is not
-   * greater than this length. This saves time but degrades compression.
-   * max_insert_length is used only for compression levels <= 3.
-   */
+  this.options = utils.assign({
+    chunkSize: 16384,
+    windowBits: 0,
+    to: ''
+  }, options || {});
 
-  this.level = 0;     /* compression level (1..9) */
-  this.strategy = 0;  /* favor or force Huffman coding*/
+  var opt = this.options;
 
-  this.good_match = 0;
-  /* Use a faster search when the previous match is longer than this */
+  // Force window size for `raw` data, if not set directly,
+  // because we have no header for autodetect.
+  if (opt.raw && (opt.windowBits >= 0) && (opt.windowBits < 16)) {
+    opt.windowBits = -opt.windowBits;
+    if (opt.windowBits === 0) { opt.windowBits = -15; }
+  }
 
-  this.nice_match = 0; /* Stop searching when current match exceeds this */
+  // If `windowBits` not defined (and mode not raw) - set autodetect flag for gzip/deflate
+  if ((opt.windowBits >= 0) && (opt.windowBits < 16) &&
+      !(options && options.windowBits)) {
+    opt.windowBits += 32;
+  }
 
-              /* used by trees.c: */
+  // Gzip header has no info about windows size, we can do autodetect only
+  // for deflate. So, if window size not set, force it to max when gzip possible
+  if ((opt.windowBits > 15) && (opt.windowBits < 48)) {
+    // bit 3 (16) -> gzipped data
+    // bit 4 (32) -> autodetect gzip/deflate
+    if ((opt.windowBits & 15) === 0) {
+      opt.windowBits |= 15;
+    }
+  }
 
-  /* Didn't use ct_data typedef below to suppress compiler warning */
+  this.err    = 0;      // error code, if happens (0 = Z_OK)
+  this.msg    = '';     // error message
+  this.ended  = false;  // used to avoid multiple onEnd() calls
+  this.chunks = [];     // chunks of compressed data
 
-  // struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
-  // struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
-  // struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */
+  this.strm   = new ZStream();
+  this.strm.avail_out = 0;
 
-  // Use flat array of DOUBLE size, with interleaved fata,
-  // because JS does not support effective
-  this.dyn_ltree  = new utils.Buf16(HEAP_SIZE * 2);
-  this.dyn_dtree  = new utils.Buf16((2 * D_CODES + 1) * 2);
-  this.bl_tree    = new utils.Buf16((2 * BL_CODES + 1) * 2);
-  zero(this.dyn_ltree);
-  zero(this.dyn_dtree);
-  zero(this.bl_tree);
+  var status  = zlib_inflate.inflateInit2(
+    this.strm,
+    opt.windowBits
+  );
 
-  this.l_desc   = null;         /* desc. for literal tree */
-  this.d_desc   = null;         /* desc. for distance tree */
-  this.bl_desc  = null;         /* desc. for bit length tree */
+  if (status !== c.Z_OK) {
+    throw new Error(msg[status]);
+  }
 
-  //ush bl_count[MAX_BITS+1];
-  this.bl_count = new utils.Buf16(MAX_BITS + 1);
-  /* number of codes at each bit length for an optimal tree */
+  this.header = new GZheader();
 
-  //int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
-  this.heap = new utils.Buf16(2 * L_CODES + 1);  /* heap used to build the Huffman trees */
-  zero(this.heap);
+  zlib_inflate.inflateGetHeader(this.strm, this.header);
+}
 
-  this.heap_len = 0;               /* number of elements in the heap */
-  this.heap_max = 0;               /* element of largest frequency */
-  /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
-   * The same heap array is used to build all trees.
-   */
+/**
+ * Inflate#push(data[, mode]) -> Boolean
+ * - data (Uint8Array|Array|ArrayBuffer|String): input data
+ * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.
+ *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.
+ *
+ * Sends input data to inflate pipe, generating [[Inflate#onData]] calls with
+ * new output chunks. Returns `true` on success. The last data block must have
+ * mode Z_FINISH (or `true`). That will flush internal pending buffers and call
+ * [[Inflate#onEnd]]. For interim explicit flushes (without ending the stream) you
+ * can use mode Z_SYNC_FLUSH, keeping the decompression context.
+ *
+ * On fail call [[Inflate#onEnd]] with error code and return false.
+ *
+ * We strongly recommend to use `Uint8Array` on input for best speed (output
+ * format is detected automatically). Also, don't skip last param and always
+ * use the same type in your code (boolean or number). That will improve JS speed.
+ *
+ * For regular `Array`-s make sure all elements are [0..255].
+ *
+ * ##### Example
+ *
+ * ```javascript
+ * push(chunk, false); // push one of data chunks
+ * ...
+ * push(chunk, true);  // push last chunk
+ * ```
+ **/
+Inflate.prototype.push = function (data, mode) {
+  var strm = this.strm;
+  var chunkSize = this.options.chunkSize;
+  var dictionary = this.options.dictionary;
+  var status, _mode;
+  var next_out_utf8, tail, utf8str;
+  var dict;
 
-  this.depth = new utils.Buf16(2 * L_CODES + 1); //uch depth[2*L_CODES+1];
-  zero(this.depth);
-  /* Depth of each subtree used as tie breaker for trees of equal frequency
-   */
+  // Flag to properly process Z_BUF_ERROR on testing inflate call
+  // when we check that all output data was flushed.
+  var allowBufError = false;
 
-  this.l_buf = 0;          /* buffer index for literals or lengths */
+  if (this.ended) { return false; }
+  _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);
 
-  this.lit_bufsize = 0;
-  /* Size of match buffer for literals/lengths.  There are 4 reasons for
-   * limiting lit_bufsize to 64K:
-   *   - frequencies can be kept in 16 bit counters
-   *   - if compression is not successful for the first block, all input
-   *     data is still in the window so we can still emit a stored block even
-   *     when input comes from standard input.  (This can also be done for
-   *     all blocks if lit_bufsize is not greater than 32K.)
-   *   - if compression is not successful for a file smaller than 64K, we can
-   *     even emit a stored file instead of a stored block (saving 5 bytes).
-   *     This is applicable only for zip (not gzip or zlib).
-   *   - creating new Huffman trees less frequently may not provide fast
-   *     adaptation to changes in the input data statistics. (Take for
-   *     example a binary file with poorly compressible code followed by
-   *     a highly compressible string table.) Smaller buffer sizes give
-   *     fast adaptation but have of course the overhead of transmitting
-   *     trees more frequently.
-   *   - I can't count above 4
-   */
+  // Convert data if needed
+  if (typeof data === 'string') {
+    // Only binary strings can be decompressed on practice
+    strm.input = strings.binstring2buf(data);
+  } else if (toString.call(data) === '[object ArrayBuffer]') {
+    strm.input = new Uint8Array(data);
+  } else {
+    strm.input = data;
+  }
 
-  this.last_lit = 0;      /* running index in l_buf */
+  strm.next_in = 0;
+  strm.avail_in = strm.input.length;
 
-  this.d_buf = 0;
-  /* Buffer index for distances. To simplify the code, d_buf and l_buf have
-   * the same number of elements. To use different lengths, an extra flag
-   * array would be necessary.
-   */
+  do {
+    if (strm.avail_out === 0) {
+      strm.output = new utils.Buf8(chunkSize);
+      strm.next_out = 0;
+      strm.avail_out = chunkSize;
+    }
 
-  this.opt_len = 0;       /* bit length of current block with optimal trees */
-  this.static_len = 0;    /* bit length of current block with static trees */
-  this.matches = 0;       /* number of string matches in current block */
-  this.insert = 0;        /* bytes at end of window left to insert */
+    status = zlib_inflate.inflate(strm, c.Z_NO_FLUSH);    /* no bad return value */
 
+    if (status === c.Z_NEED_DICT && dictionary) {
+      // Convert data if needed
+      if (typeof dictionary === 'string') {
+        dict = strings.string2buf(dictionary);
+      } else if (toString.call(dictionary) === '[object ArrayBuffer]') {
+        dict = new Uint8Array(dictionary);
+      } else {
+        dict = dictionary;
+      }
 
-  this.bi_buf = 0;
-  /* Output buffer. bits are inserted starting at the bottom (least
-   * significant bits).
-   */
-  this.bi_valid = 0;
-  /* Number of valid bits in bi_buf.  All bits above the last valid bit
-   * are always zero.
-   */
+      status = zlib_inflate.inflateSetDictionary(this.strm, dict);
 
-  // Used for window memory init. We safely ignore it for JS. That makes
-  // sense only for pointers and memory check tools.
-  //this.high_water = 0;
-  /* High water mark offset in window for initialized bytes -- bytes above
-   * this are set to zero in order to avoid memory check warnings when
-   * longest match routines access bytes past the input.  This is then
-   * updated to the new high water mark.
-   */
-}
+    }
 
+    if (status === c.Z_BUF_ERROR && allowBufError === true) {
+      status = c.Z_OK;
+      allowBufError = false;
+    }
 
-function deflateResetKeep(strm) {
-  var s;
+    if (status !== c.Z_STREAM_END && status !== c.Z_OK) {
+      this.onEnd(status);
+      this.ended = true;
+      return false;
+    }
 
-  if (!strm || !strm.state) {
-    return err(strm, Z_STREAM_ERROR);
-  }
+    if (strm.next_out) {
+      if (strm.avail_out === 0 || status === c.Z_STREAM_END || (strm.avail_in === 0 && (_mode === c.Z_FINISH || _mode === c.Z_SYNC_FLUSH))) {
 
-  strm.total_in = strm.total_out = 0;
-  strm.data_type = Z_UNKNOWN;
+        if (this.options.to === 'string') {
 
-  s = strm.state;
-  s.pending = 0;
-  s.pending_out = 0;
+          next_out_utf8 = strings.utf8border(strm.output, strm.next_out);
 
-  if (s.wrap < 0) {
-    s.wrap = -s.wrap;
-    /* was made negative by deflate(..., Z_FINISH); */
-  }
-  s.status = (s.wrap ? INIT_STATE : BUSY_STATE);
-  strm.adler = (s.wrap === 2) ?
-    0  // crc32(0, Z_NULL, 0)
-  :
-    1; // adler32(0, Z_NULL, 0)
-  s.last_flush = Z_NO_FLUSH;
-  trees._tr_init(s);
-  return Z_OK;
-}
+          tail = strm.next_out - next_out_utf8;
+          utf8str = strings.buf2string(strm.output, next_out_utf8);
 
+          // move tail
+          strm.next_out = tail;
+          strm.avail_out = chunkSize - tail;
+          if (tail) { utils.arraySet(strm.output, strm.output, next_out_utf8, tail, 0); }
 
-function deflateReset(strm) {
-  var ret = deflateResetKeep(strm);
-  if (ret === Z_OK) {
-    lm_init(strm.state);
-  }
-  return ret;
-}
+          this.onData(utf8str);
 
+        } else {
+          this.onData(utils.shrinkBuf(strm.output, strm.next_out));
+        }
+      }
+    }
 
-function deflateSetHeader(strm, head) {
-  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
-  if (strm.state.wrap !== 2) { return Z_STREAM_ERROR; }
-  strm.state.gzhead = head;
-  return Z_OK;
-}
+    // When no more input data, we should check that internal inflate buffers
+    // are flushed. The only way to do it when avail_out = 0 - run one more
+    // inflate pass. But if output data not exists, inflate return Z_BUF_ERROR.
+    // Here we set flag to process this error properly.
+    //
+    // NOTE. Deflate does not return error in this case and does not needs such
+    // logic.
+    if (strm.avail_in === 0 && strm.avail_out === 0) {
+      allowBufError = true;
+    }
 
+  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== c.Z_STREAM_END);
 
-function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
-  if (!strm) { // === Z_NULL
-    return Z_STREAM_ERROR;
+  if (status === c.Z_STREAM_END) {
+    _mode = c.Z_FINISH;
   }
-  var wrap = 1;
 
-  if (level === Z_DEFAULT_COMPRESSION) {
-    level = 6;
+  // Finalize on the last chunk.
+  if (_mode === c.Z_FINISH) {
+    status = zlib_inflate.inflateEnd(this.strm);
+    this.onEnd(status);
+    this.ended = true;
+    return status === c.Z_OK;
   }
 
-  if (windowBits < 0) { /* suppress zlib wrapper */
-    wrap = 0;
-    windowBits = -windowBits;
+  // callback interim results if Z_SYNC_FLUSH.
+  if (_mode === c.Z_SYNC_FLUSH) {
+    this.onEnd(c.Z_OK);
+    strm.avail_out = 0;
+    return true;
   }
 
-  else if (windowBits > 15) {
-    wrap = 2;           /* write gzip wrapper instead */
-    windowBits -= 16;
-  }
+  return true;
+};
 
 
-  if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method !== Z_DEFLATED ||
-    windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
-    strategy < 0 || strategy > Z_FIXED) {
-    return err(strm, Z_STREAM_ERROR);
-  }
+/**
+ * Inflate#onData(chunk) -> Void
+ * - chunk (Uint8Array|Array|String): ouput data. Type of array depends
+ *   on js engine support. When string output requested, each chunk
+ *   will be string.
+ *
+ * By default, stores data blocks in `chunks[]` property and glue
+ * those in `onEnd`. Override this handler, if you need another behaviour.
+ **/
+Inflate.prototype.onData = function (chunk) {
+  this.chunks.push(chunk);
+};
 
 
-  if (windowBits === 8) {
-    windowBits = 9;
+/**
+ * Inflate#onEnd(status) -> Void
+ * - status (Number): inflate status. 0 (Z_OK) on success,
+ *   other if not.
+ *
+ * Called either after you tell inflate that the input stream is
+ * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)
+ * or if an error happened. By default - join collected chunks,
+ * free memory and fill `results` / `err` properties.
+ **/
+Inflate.prototype.onEnd = function (status) {
+  // On success - join
+  if (status === c.Z_OK) {
+    if (this.options.to === 'string') {
+      // Glue & convert here, until we teach pako to send
+      // utf8 alligned strings to onData
+      this.result = this.chunks.join('');
+    } else {
+      this.result = utils.flattenChunks(this.chunks);
+    }
   }
-  /* until 256-byte window bug fixed */
+  this.chunks = [];
+  this.err = status;
+  this.msg = this.strm.msg;
+};
 
-  var s = new DeflateState();
 
-  strm.state = s;
-  s.strm = strm;
+/**
+ * inflate(data[, options]) -> Uint8Array|Array|String
+ * - data (Uint8Array|Array|String): input data to decompress.
+ * - options (Object): zlib inflate options.
+ *
+ * Decompress `data` with inflate/ungzip and `options`. Autodetect
+ * format via wrapper header by default. That's why we don't provide
+ * separate `ungzip` method.
+ *
+ * Supported options are:
+ *
+ * - windowBits
+ *
+ * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
+ * for more information.
+ *
+ * Sugar (options):
+ *
+ * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify
+ *   negative windowBits implicitly.
+ * - `to` (String) - if equal to 'string', then result will be converted
+ *   from utf8 to utf16 (javascript) string. When string output requested,
+ *   chunk length can differ from `chunkSize`, depending on content.
+ *
+ *
+ * ##### Example:
+ *
+ * ```javascript
+ * var pako = require('pako')
+ *   , input = pako.deflate([1,2,3,4,5,6,7,8,9])
+ *   , output;
+ *
+ * try {
+ *   output = pako.inflate(input);
+ * } catch (err)
+ *   console.log(err);
+ * }
+ * ```
+ **/
+function inflate(input, options) {
+  var inflator = new Inflate(options);
 
-  s.wrap = wrap;
-  s.gzhead = null;
-  s.w_bits = windowBits;
-  s.w_size = 1 << s.w_bits;
-  s.w_mask = s.w_size - 1;
+  inflator.push(input, true);
 
-  s.hash_bits = memLevel + 7;
-  s.hash_size = 1 << s.hash_bits;
-  s.hash_mask = s.hash_size - 1;
-  s.hash_shift = ~~((s.hash_bits + MIN_MATCH - 1) / MIN_MATCH);
+  // That will never happens, if you don't cheat with options :)
+  if (inflator.err) { throw inflator.msg; }
 
-  s.window = new utils.Buf8(s.w_size * 2);
-  s.head = new utils.Buf16(s.hash_size);
-  s.prev = new utils.Buf16(s.w_size);
+  return inflator.result;
+}
 
-  // Don't need mem init magic for JS.
-  //s.high_water = 0;  /* nothing written to s->window yet */
 
-  s.lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
+/**
+ * inflateRaw(data[, options]) -> Uint8Array|Array|String
+ * - data (Uint8Array|Array|String): input data to decompress.
+ * - options (Object): zlib inflate options.
+ *
+ * The same as [[inflate]], but creates raw data, without wrapper
+ * (header and adler32 crc).
+ **/
+function inflateRaw(input, options) {
+  options = options || {};
+  options.raw = true;
+  return inflate(input, options);
+}
 
-  s.pending_buf_size = s.lit_bufsize * 4;
 
-  //overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
-  //s->pending_buf = (uchf *) overlay;
-  s.pending_buf = new utils.Buf8(s.pending_buf_size);
+/**
+ * ungzip(data[, options]) -> Uint8Array|Array|String
+ * - data (Uint8Array|Array|String): input data to decompress.
+ * - options (Object): zlib inflate options.
+ *
+ * Just shortcut to [[inflate]], because it autodetects format
+ * by header.content. Done for convenience.
+ **/
 
-  // It is offset from `s.pending_buf` (size is `s.lit_bufsize * 2`)
-  //s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
-  s.d_buf = 1 * s.lit_bufsize;
 
-  //s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
-  s.l_buf = (1 + 2) * s.lit_bufsize;
+exports.Inflate = Inflate;
+exports.inflate = inflate;
+exports.inflateRaw = inflateRaw;
+exports.ungzip  = inflate;
 
-  s.level = level;
-  s.strategy = strategy;
-  s.method = method;
+},{"./utils/common":167,"./utils/strings":168,"./zlib/constants":170,"./zlib/gzheader":173,"./zlib/inflate":175,"./zlib/messages":177,"./zlib/zstream":179}],167:[function(_dereq_,module,exports){
+'use strict';
 
-  return deflateReset(strm);
-}
 
-function deflateInit(strm, level) {
-  return deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
-}
+var TYPED_OK =  (typeof Uint8Array !== 'undefined') &&
+                (typeof Uint16Array !== 'undefined') &&
+                (typeof Int32Array !== 'undefined');
 
 
-function deflate(strm, flush) {
-  var old_flush, s;
-  var beg, val; // for gzip header write only
+exports.assign = function (obj /*from1, from2, from3, ...*/) {
+  var sources = Array.prototype.slice.call(arguments, 1);
+  while (sources.length) {
+    var source = sources.shift();
+    if (!source) { continue; }
 
-  if (!strm || !strm.state ||
-    flush > Z_BLOCK || flush < 0) {
-    return strm ? err(strm, Z_STREAM_ERROR) : Z_STREAM_ERROR;
+    if (typeof source !== 'object') {
+      throw new TypeError(source + 'must be non-object');
+    }
+
+    for (var p in source) {
+      if (source.hasOwnProperty(p)) {
+        obj[p] = source[p];
+      }
+    }
   }
 
-  s = strm.state;
+  return obj;
+};
 
-  if (!strm.output ||
-      (!strm.input && strm.avail_in !== 0) ||
-      (s.status === FINISH_STATE && flush !== Z_FINISH)) {
-    return err(strm, (strm.avail_out === 0) ? Z_BUF_ERROR : Z_STREAM_ERROR);
-  }
 
-  s.strm = strm; /* just in case */
-  old_flush = s.last_flush;
-  s.last_flush = flush;
+// reduce buffer size, avoiding mem copy
+exports.shrinkBuf = function (buf, size) {
+  if (buf.length === size) { return buf; }
+  if (buf.subarray) { return buf.subarray(0, size); }
+  buf.length = size;
+  return buf;
+};
 
-  /* Write the header */
-  if (s.status === INIT_STATE) {
 
-    if (s.wrap === 2) { // GZIP header
-      strm.adler = 0;  //crc32(0L, Z_NULL, 0);
-      put_byte(s, 31);
-      put_byte(s, 139);
-      put_byte(s, 8);
-      if (!s.gzhead) { // s->gzhead == Z_NULL
-        put_byte(s, 0);
-        put_byte(s, 0);
-        put_byte(s, 0);
-        put_byte(s, 0);
-        put_byte(s, 0);
-        put_byte(s, s.level === 9 ? 2 :
-                    (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
-                     4 : 0));
-        put_byte(s, OS_CODE);
-        s.status = BUSY_STATE;
-      }
-      else {
-        put_byte(s, (s.gzhead.text ? 1 : 0) +
-                    (s.gzhead.hcrc ? 2 : 0) +
-                    (!s.gzhead.extra ? 0 : 4) +
-                    (!s.gzhead.name ? 0 : 8) +
-                    (!s.gzhead.comment ? 0 : 16)
-                );
-        put_byte(s, s.gzhead.time & 0xff);
-        put_byte(s, (s.gzhead.time >> 8) & 0xff);
-        put_byte(s, (s.gzhead.time >> 16) & 0xff);
-        put_byte(s, (s.gzhead.time >> 24) & 0xff);
-        put_byte(s, s.level === 9 ? 2 :
-                    (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
-                     4 : 0));
-        put_byte(s, s.gzhead.os & 0xff);
-        if (s.gzhead.extra && s.gzhead.extra.length) {
-          put_byte(s, s.gzhead.extra.length & 0xff);
-          put_byte(s, (s.gzhead.extra.length >> 8) & 0xff);
-        }
-        if (s.gzhead.hcrc) {
-          strm.adler = crc32(strm.adler, s.pending_buf, s.pending, 0);
-        }
-        s.gzindex = 0;
-        s.status = EXTRA_STATE;
-      }
+var fnTyped = {
+  arraySet: function (dest, src, src_offs, len, dest_offs) {
+    if (src.subarray && dest.subarray) {
+      dest.set(src.subarray(src_offs, src_offs + len), dest_offs);
+      return;
     }
-    else // DEFLATE header
-    {
-      var header = (Z_DEFLATED + ((s.w_bits - 8) << 4)) << 8;
-      var level_flags = -1;
-
-      if (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2) {
-        level_flags = 0;
-      } else if (s.level < 6) {
-        level_flags = 1;
-      } else if (s.level === 6) {
-        level_flags = 2;
-      } else {
-        level_flags = 3;
-      }
-      header |= (level_flags << 6);
-      if (s.strstart !== 0) { header |= PRESET_DICT; }
-      header += 31 - (header % 31);
+    // Fallback to ordinary array
+    for (var i = 0; i < len; i++) {
+      dest[dest_offs + i] = src[src_offs + i];
+    }
+  },
+  // Join array of chunks to single array.
+  flattenChunks: function (chunks) {
+    var i, l, len, pos, chunk, result;
 
-      s.status = BUSY_STATE;
-      putShortMSB(s, header);
+    // calculate data length
+    len = 0;
+    for (i = 0, l = chunks.length; i < l; i++) {
+      len += chunks[i].length;
+    }
 
-      /* Save the adler32 of the preset dictionary: */
-      if (s.strstart !== 0) {
-        putShortMSB(s, strm.adler >>> 16);
-        putShortMSB(s, strm.adler & 0xffff);
-      }
-      strm.adler = 1; // adler32(0L, Z_NULL, 0);
+    // join chunks
+    result = new Uint8Array(len);
+    pos = 0;
+    for (i = 0, l = chunks.length; i < l; i++) {
+      chunk = chunks[i];
+      result.set(chunk, pos);
+      pos += chunk.length;
     }
-  }
 
-//#ifdef GZIP
-  if (s.status === EXTRA_STATE) {
-    if (s.gzhead.extra/* != Z_NULL*/) {
-      beg = s.pending;  /* start of bytes to update crc */
+    return result;
+  }
+};
 
-      while (s.gzindex < (s.gzhead.extra.length & 0xffff)) {
-        if (s.pending === s.pending_buf_size) {
-          if (s.gzhead.hcrc && s.pending > beg) {
-            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
-          }
-          flush_pending(strm);
-          beg = s.pending;
-          if (s.pending === s.pending_buf_size) {
-            break;
-          }
-        }
-        put_byte(s, s.gzhead.extra[s.gzindex] & 0xff);
-        s.gzindex++;
-      }
-      if (s.gzhead.hcrc && s.pending > beg) {
-        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
-      }
-      if (s.gzindex === s.gzhead.extra.length) {
-        s.gzindex = 0;
-        s.status = NAME_STATE;
-      }
-    }
-    else {
-      s.status = NAME_STATE;
+var fnUntyped = {
+  arraySet: function (dest, src, src_offs, len, dest_offs) {
+    for (var i = 0; i < len; i++) {
+      dest[dest_offs + i] = src[src_offs + i];
     }
+  },
+  // Join array of chunks to single array.
+  flattenChunks: function (chunks) {
+    return [].concat.apply([], chunks);
   }
-  if (s.status === NAME_STATE) {
-    if (s.gzhead.name/* != Z_NULL*/) {
-      beg = s.pending;  /* start of bytes to update crc */
-      //int val;
+};
 
-      do {
-        if (s.pending === s.pending_buf_size) {
-          if (s.gzhead.hcrc && s.pending > beg) {
-            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
-          }
-          flush_pending(strm);
-          beg = s.pending;
-          if (s.pending === s.pending_buf_size) {
-            val = 1;
-            break;
-          }
-        }
-        // JS specific: little magic to add zero terminator to end of string
-        if (s.gzindex < s.gzhead.name.length) {
-          val = s.gzhead.name.charCodeAt(s.gzindex++) & 0xff;
-        } else {
-          val = 0;
-        }
-        put_byte(s, val);
-      } while (val !== 0);
 
-      if (s.gzhead.hcrc && s.pending > beg) {
-        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
-      }
-      if (val === 0) {
-        s.gzindex = 0;
-        s.status = COMMENT_STATE;
-      }
-    }
-    else {
-      s.status = COMMENT_STATE;
-    }
+// Enable/Disable typed arrays use, for testing
+//
+exports.setTyped = function (on) {
+  if (on) {
+    exports.Buf8  = Uint8Array;
+    exports.Buf16 = Uint16Array;
+    exports.Buf32 = Int32Array;
+    exports.assign(exports, fnTyped);
+  } else {
+    exports.Buf8  = Array;
+    exports.Buf16 = Array;
+    exports.Buf32 = Array;
+    exports.assign(exports, fnUntyped);
   }
-  if (s.status === COMMENT_STATE) {
-    if (s.gzhead.comment/* != Z_NULL*/) {
-      beg = s.pending;  /* start of bytes to update crc */
-      //int val;
+};
 
-      do {
-        if (s.pending === s.pending_buf_size) {
-          if (s.gzhead.hcrc && s.pending > beg) {
-            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
-          }
-          flush_pending(strm);
-          beg = s.pending;
-          if (s.pending === s.pending_buf_size) {
-            val = 1;
-            break;
-          }
-        }
-        // JS specific: little magic to add zero terminator to end of string
-        if (s.gzindex < s.gzhead.comment.length) {
-          val = s.gzhead.comment.charCodeAt(s.gzindex++) & 0xff;
-        } else {
-          val = 0;
-        }
-        put_byte(s, val);
-      } while (val !== 0);
+exports.setTyped(TYPED_OK);
 
-      if (s.gzhead.hcrc && s.pending > beg) {
-        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
-      }
-      if (val === 0) {
-        s.status = HCRC_STATE;
-      }
-    }
-    else {
-      s.status = HCRC_STATE;
-    }
-  }
-  if (s.status === HCRC_STATE) {
-    if (s.gzhead.hcrc) {
-      if (s.pending + 2 > s.pending_buf_size) {
-        flush_pending(strm);
-      }
-      if (s.pending + 2 <= s.pending_buf_size) {
-        put_byte(s, strm.adler & 0xff);
-        put_byte(s, (strm.adler >> 8) & 0xff);
-        strm.adler = 0; //crc32(0L, Z_NULL, 0);
-        s.status = BUSY_STATE;
-      }
-    }
-    else {
-      s.status = BUSY_STATE;
-    }
-  }
-//#endif
+},{}],168:[function(_dereq_,module,exports){
+// String encode/decode helpers
+'use strict';
 
-  /* Flush as much pending output as possible */
-  if (s.pending !== 0) {
-    flush_pending(strm);
-    if (strm.avail_out === 0) {
-      /* Since avail_out is 0, deflate will be called again with
-       * more output space, but possibly with both pending and
-       * avail_in equal to zero. There won't be anything to do,
-       * but this is not an error situation so make sure we
-       * return OK instead of BUF_ERROR at next call of deflate:
-       */
-      s.last_flush = -1;
-      return Z_OK;
-    }
 
-    /* Make sure there is something to do and avoid duplicate consecutive
-     * flushes. For repeated and useless calls with Z_FINISH, we keep
-     * returning Z_STREAM_END instead of Z_BUF_ERROR.
-     */
-  } else if (strm.avail_in === 0 && rank(flush) <= rank(old_flush) &&
-    flush !== Z_FINISH) {
-    return err(strm, Z_BUF_ERROR);
-  }
+var utils = _dereq_('./common');
 
-  /* User must not provide more input after the first FINISH: */
-  if (s.status === FINISH_STATE && strm.avail_in !== 0) {
-    return err(strm, Z_BUF_ERROR);
-  }
 
-  /* Start a new block or continue the current one.
-   */
-  if (strm.avail_in !== 0 || s.lookahead !== 0 ||
-    (flush !== Z_NO_FLUSH && s.status !== FINISH_STATE)) {
-    var bstate = (s.strategy === Z_HUFFMAN_ONLY) ? deflate_huff(s, flush) :
-      (s.strategy === Z_RLE ? deflate_rle(s, flush) :
-        configuration_table[s.level].func(s, flush));
+// Quick check if we can use fast array to bin string conversion
+//
+// - apply(Array) can fail on Android 2.2
+// - apply(Uint8Array) can fail on iOS 5.1 Safary
+//
+var STR_APPLY_OK = true;
+var STR_APPLY_UIA_OK = true;
 
-    if (bstate === BS_FINISH_STARTED || bstate === BS_FINISH_DONE) {
-      s.status = FINISH_STATE;
-    }
-    if (bstate === BS_NEED_MORE || bstate === BS_FINISH_STARTED) {
-      if (strm.avail_out === 0) {
-        s.last_flush = -1;
-        /* avoid BUF_ERROR next call, see above */
+try { String.fromCharCode.apply(null, [ 0 ]); } catch (__) { STR_APPLY_OK = false; }
+try { String.fromCharCode.apply(null, new Uint8Array(1)); } catch (__) { STR_APPLY_UIA_OK = false; }
+
+
+// Table with utf8 lengths (calculated by first byte of sequence)
+// Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,
+// because max possible codepoint is 0x10ffff
+var _utf8len = new utils.Buf8(256);
+for (var q = 0; q < 256; q++) {
+  _utf8len[q] = (q >= 252 ? 6 : q >= 248 ? 5 : q >= 240 ? 4 : q >= 224 ? 3 : q >= 192 ? 2 : 1);
+}
+_utf8len[254] = _utf8len[254] = 1; // Invalid sequence start
+
+
+// convert string to array (typed, when possible)
+exports.string2buf = function (str) {
+  var buf, c, c2, m_pos, i, str_len = str.length, buf_len = 0;
+
+  // count binary size
+  for (m_pos = 0; m_pos < str_len; m_pos++) {
+    c = str.charCodeAt(m_pos);
+    if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {
+      c2 = str.charCodeAt(m_pos + 1);
+      if ((c2 & 0xfc00) === 0xdc00) {
+        c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
+        m_pos++;
       }
-      return Z_OK;
-      /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
-       * of deflate should use the same flush parameter to make sure
-       * that the flush is complete. So we don't have to output an
-       * empty block here, this will be done at next call. This also
-       * ensures that for a very small output buffer, we emit at most
-       * one empty block.
-       */
     }
-    if (bstate === BS_BLOCK_DONE) {
-      if (flush === Z_PARTIAL_FLUSH) {
-        trees._tr_align(s);
-      }
-      else if (flush !== Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
+    buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;
+  }
 
-        trees._tr_stored_block(s, 0, 0, false);
-        /* For a full flush, this empty block will be recognized
-         * as a special marker by inflate_sync().
-         */
-        if (flush === Z_FULL_FLUSH) {
-          /*** CLEAR_HASH(s); ***/             /* forget history */
-          zero(s.head); // Fill with NIL (= 0);
+  // allocate buffer
+  buf = new utils.Buf8(buf_len);
 
-          if (s.lookahead === 0) {
-            s.strstart = 0;
-            s.block_start = 0;
-            s.insert = 0;
-          }
-        }
-      }
-      flush_pending(strm);
-      if (strm.avail_out === 0) {
-        s.last_flush = -1; /* avoid BUF_ERROR at next call, see above */
-        return Z_OK;
+  // convert
+  for (i = 0, m_pos = 0; i < buf_len; m_pos++) {
+    c = str.charCodeAt(m_pos);
+    if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {
+      c2 = str.charCodeAt(m_pos + 1);
+      if ((c2 & 0xfc00) === 0xdc00) {
+        c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
+        m_pos++;
       }
     }
+    if (c < 0x80) {
+      /* one byte */
+      buf[i++] = c;
+    } else if (c < 0x800) {
+      /* two bytes */
+      buf[i++] = 0xC0 | (c >>> 6);
+      buf[i++] = 0x80 | (c & 0x3f);
+    } else if (c < 0x10000) {
+      /* three bytes */
+      buf[i++] = 0xE0 | (c >>> 12);
+      buf[i++] = 0x80 | (c >>> 6 & 0x3f);
+      buf[i++] = 0x80 | (c & 0x3f);
+    } else {
+      /* four bytes */
+      buf[i++] = 0xf0 | (c >>> 18);
+      buf[i++] = 0x80 | (c >>> 12 & 0x3f);
+      buf[i++] = 0x80 | (c >>> 6 & 0x3f);
+      buf[i++] = 0x80 | (c & 0x3f);
+    }
   }
-  //Assert(strm->avail_out > 0, "bug2");
-  //if (strm.avail_out <= 0) { throw new Error("bug2");}
 
-  if (flush !== Z_FINISH) { return Z_OK; }
-  if (s.wrap <= 0) { return Z_STREAM_END; }
+  return buf;
+};
 
-  /* Write the trailer */
-  if (s.wrap === 2) {
-    put_byte(s, strm.adler & 0xff);
-    put_byte(s, (strm.adler >> 8) & 0xff);
-    put_byte(s, (strm.adler >> 16) & 0xff);
-    put_byte(s, (strm.adler >> 24) & 0xff);
-    put_byte(s, strm.total_in & 0xff);
-    put_byte(s, (strm.total_in >> 8) & 0xff);
-    put_byte(s, (strm.total_in >> 16) & 0xff);
-    put_byte(s, (strm.total_in >> 24) & 0xff);
-  }
-  else
-  {
-    putShortMSB(s, strm.adler >>> 16);
-    putShortMSB(s, strm.adler & 0xffff);
+// Helper (used in 2 places)
+function buf2binstring(buf, len) {
+  // use fallback for big arrays to avoid stack overflow
+  if (len < 65537) {
+    if ((buf.subarray && STR_APPLY_UIA_OK) || (!buf.subarray && STR_APPLY_OK)) {
+      return String.fromCharCode.apply(null, utils.shrinkBuf(buf, len));
+    }
   }
 
-  flush_pending(strm);
-  /* If avail_out is zero, the application will call deflate again
-   * to flush the rest.
-   */
-  if (s.wrap > 0) { s.wrap = -s.wrap; }
-  /* write the trailer only once! */
-  return s.pending !== 0 ? Z_OK : Z_STREAM_END;
+  var result = '';
+  for (var i = 0; i < len; i++) {
+    result += String.fromCharCode(buf[i]);
+  }
+  return result;
 }
 
-function deflateEnd(strm) {
-  var status;
 
-  if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
-    return Z_STREAM_ERROR;
-  }
+// Convert byte array to binary string
+exports.buf2binstring = function (buf) {
+  return buf2binstring(buf, buf.length);
+};
 
-  status = strm.state.status;
-  if (status !== INIT_STATE &&
-    status !== EXTRA_STATE &&
-    status !== NAME_STATE &&
-    status !== COMMENT_STATE &&
-    status !== HCRC_STATE &&
-    status !== BUSY_STATE &&
-    status !== FINISH_STATE
-  ) {
-    return err(strm, Z_STREAM_ERROR);
+
+// Convert binary string (typed, when possible)
+exports.binstring2buf = function (str) {
+  var buf = new utils.Buf8(str.length);
+  for (var i = 0, len = buf.length; i < len; i++) {
+    buf[i] = str.charCodeAt(i);
   }
+  return buf;
+};
 
-  strm.state = null;
 
-  return status === BUSY_STATE ? err(strm, Z_DATA_ERROR) : Z_OK;
-}
+// convert array to string
+exports.buf2string = function (buf, max) {
+  var i, out, c, c_len;
+  var len = max || buf.length;
 
+  // Reserve max possible length (2 words per char)
+  // NB: by unknown reasons, Array is significantly faster for
+  //     String.fromCharCode.apply than Uint16Array.
+  var utf16buf = new Array(len * 2);
 
-/* =========================================================================
- * Initializes the compression dictionary from the given byte
- * sequence without producing any compressed output.
- */
-function deflateSetDictionary(strm, dictionary) {
-  var dictLength = dictionary.length;
+  for (out = 0, i = 0; i < len;) {
+    c = buf[i++];
+    // quick process ascii
+    if (c < 0x80) { utf16buf[out++] = c; continue; }
 
-  var s;
-  var str, n;
-  var wrap;
-  var avail;
-  var next;
-  var input;
-  var tmpDict;
+    c_len = _utf8len[c];
+    // skip 5 & 6 byte codes
+    if (c_len > 4) { utf16buf[out++] = 0xfffd; i += c_len - 1; continue; }
 
-  if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
-    return Z_STREAM_ERROR;
-  }
+    // apply mask on first byte
+    c &= c_len === 2 ? 0x1f : c_len === 3 ? 0x0f : 0x07;
+    // join the rest
+    while (c_len > 1 && i < len) {
+      c = (c << 6) | (buf[i++] & 0x3f);
+      c_len--;
+    }
 
-  s = strm.state;
-  wrap = s.wrap;
+    // terminated by end of string?
+    if (c_len > 1) { utf16buf[out++] = 0xfffd; continue; }
 
-  if (wrap === 2 || (wrap === 1 && s.status !== INIT_STATE) || s.lookahead) {
-    return Z_STREAM_ERROR;
+    if (c < 0x10000) {
+      utf16buf[out++] = c;
+    } else {
+      c -= 0x10000;
+      utf16buf[out++] = 0xd800 | ((c >> 10) & 0x3ff);
+      utf16buf[out++] = 0xdc00 | (c & 0x3ff);
+    }
   }
 
-  /* when using zlib wrappers, compute Adler-32 for provided dictionary */
-  if (wrap === 1) {
-    /* adler32(strm->adler, dictionary, dictLength); */
-    strm.adler = adler32(strm.adler, dictionary, dictLength, 0);
-  }
+  return buf2binstring(utf16buf, out);
+};
 
-  s.wrap = 0;   /* avoid computing Adler-32 in read_buf */
 
-  /* if dictionary would fill window, just replace the history */
-  if (dictLength >= s.w_size) {
-    if (wrap === 0) {            /* already empty otherwise */
-      /*** CLEAR_HASH(s); ***/
-      zero(s.head); // Fill with NIL (= 0);
-      s.strstart = 0;
-      s.block_start = 0;
-      s.insert = 0;
-    }
-    /* use the tail */
-    // dictionary = dictionary.slice(dictLength - s.w_size);
-    tmpDict = new utils.Buf8(s.w_size);
-    utils.arraySet(tmpDict, dictionary, dictLength - s.w_size, s.w_size, 0);
-    dictionary = tmpDict;
-    dictLength = s.w_size;
-  }
-  /* insert dictionary into window and hash */
-  avail = strm.avail_in;
-  next = strm.next_in;
-  input = strm.input;
-  strm.avail_in = dictLength;
-  strm.next_in = 0;
-  strm.input = dictionary;
-  fill_window(s);
-  while (s.lookahead >= MIN_MATCH) {
-    str = s.strstart;
-    n = s.lookahead - (MIN_MATCH - 1);
-    do {
-      /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
-      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;
+// Calculate max possible position in utf8 buffer,
+// that will not break sequence. If that's not possible
+// - (very small limits) return max size as is.
+//
+// buf[] - utf8 bytes array
+// max   - length limit (mandatory);
+exports.utf8border = function (buf, max) {
+  var pos;
 
-      s.prev[str & s.w_mask] = s.head[s.ins_h];
+  max = max || buf.length;
+  if (max > buf.length) { max = buf.length; }
 
-      s.head[s.ins_h] = str;
-      str++;
+  // go back from last position, until start of sequence found
+  pos = max - 1;
+  while (pos >= 0 && (buf[pos] & 0xC0) === 0x80) { pos--; }
+
+  // Fuckup - very small and broken sequence,
+  // return max, because we should return something anyway.
+  if (pos < 0) { return max; }
+
+  // If we came to start of buffer - that means vuffer is too small,
+  // return max too.
+  if (pos === 0) { return max; }
+
+  return (pos + _utf8len[buf[pos]] > max) ? pos : max;
+};
+
+},{"./common":167}],169:[function(_dereq_,module,exports){
+'use strict';
+
+// Note: adler32 takes 12% for level 0 and 2% for level 6.
+// It doesn't worth to make additional optimizationa as in original.
+// Small size is preferable.
+
+function adler32(adler, buf, len, pos) {
+  var s1 = (adler & 0xffff) |0,
+      s2 = ((adler >>> 16) & 0xffff) |0,
+      n = 0;
+
+  while (len !== 0) {
+    // Set limit ~ twice less than 5552, to keep
+    // s2 in 31-bits, because we force signed ints.
+    // in other case %= will fail.
+    n = len > 2000 ? 2000 : len;
+    len -= n;
+
+    do {
+      s1 = (s1 + buf[pos++]) |0;
+      s2 = (s2 + s1) |0;
     } while (--n);
-    s.strstart = str;
-    s.lookahead = MIN_MATCH - 1;
-    fill_window(s);
+
+    s1 %= 65521;
+    s2 %= 65521;
   }
-  s.strstart += s.lookahead;
-  s.block_start = s.strstart;
-  s.insert = s.lookahead;
-  s.lookahead = 0;
-  s.match_length = s.prev_length = MIN_MATCH - 1;
-  s.match_available = 0;
-  strm.next_in = next;
-  strm.input = input;
-  strm.avail_in = avail;
-  s.wrap = wrap;
-  return Z_OK;
+
+  return (s1 | (s2 << 16)) |0;
 }
 
 
-exports.deflateInit = deflateInit;
-exports.deflateInit2 = deflateInit2;
-exports.deflateReset = deflateReset;
-exports.deflateResetKeep = deflateResetKeep;
-exports.deflateSetHeader = deflateSetHeader;
-exports.deflate = deflate;
-exports.deflateEnd = deflateEnd;
-exports.deflateSetDictionary = deflateSetDictionary;
-exports.deflateInfo = 'pako deflate (from Nodeca project)';
+module.exports = adler32;
 
-/* Not implemented
-exports.deflateBound = deflateBound;
-exports.deflateCopy = deflateCopy;
-exports.deflateParams = deflateParams;
-exports.deflatePending = deflatePending;
-exports.deflatePrime = deflatePrime;
-exports.deflateTune = deflateTune;
-*/
+},{}],170:[function(_dereq_,module,exports){
+'use strict';
+
+
+module.exports = {
+
+  /* Allowed flush values; see deflate() and inflate() below for details */
+  Z_NO_FLUSH:         0,
+  Z_PARTIAL_FLUSH:    1,
+  Z_SYNC_FLUSH:       2,
+  Z_FULL_FLUSH:       3,
+  Z_FINISH:           4,
+  Z_BLOCK:            5,
+  Z_TREES:            6,
+
+  /* Return codes for the compression/decompression functions. Negative values
+  * are errors, positive values are used for special but normal events.
+  */
+  Z_OK:               0,
+  Z_STREAM_END:       1,
+  Z_NEED_DICT:        2,
+  Z_ERRNO:           -1,
+  Z_STREAM_ERROR:    -2,
+  Z_DATA_ERROR:      -3,
+  //Z_MEM_ERROR:     -4,
+  Z_BUF_ERROR:       -5,
+  //Z_VERSION_ERROR: -6,
+
+  /* compression levels */
+  Z_NO_COMPRESSION:         0,
+  Z_BEST_SPEED:             1,
+  Z_BEST_COMPRESSION:       9,
+  Z_DEFAULT_COMPRESSION:   -1,
+
+
+  Z_FILTERED:               1,
+  Z_HUFFMAN_ONLY:           2,
+  Z_RLE:                    3,
+  Z_FIXED:                  4,
+  Z_DEFAULT_STRATEGY:       0,
+
+  /* Possible values of the data_type field (though see inflate()) */
+  Z_BINARY:                 0,
+  Z_TEXT:                   1,
+  //Z_ASCII:                1, // = Z_TEXT (deprecated)
+  Z_UNKNOWN:                2,
+
+  /* The deflate compression method */
+  Z_DEFLATED:               8
+  //Z_NULL:                 null // Use -1 or null inline, depending on var type
+};
 
-},{"../utils/common":163,"./adler32":165,"./crc32":167,"./messages":173,"./trees":174}],169:[function(_dereq_,module,exports){
+},{}],171:[function(_dereq_,module,exports){
 'use strict';
 
+// Note: we can't get significant speed boost here.
+// So write code to minimize size - no pregenerated tables
+// and array tools dependencies.
 
-function GZheader() {
-  /* true if compressed data believed to be text */
-  this.text       = 0;
-  /* modification time */
-  this.time       = 0;
-  /* extra flags (not used when writing a gzip file) */
-  this.xflags     = 0;
-  /* operating system */
-  this.os         = 0;
-  /* pointer to extra field or Z_NULL if none */
-  this.extra      = null;
-  /* extra field length (valid if extra != Z_NULL) */
-  this.extra_len  = 0; // Actually, we don't need it in JS,
-                       // but leave for few code modifications
 
-  //
-  // Setup limits is not necessary because in js we should not preallocate memory
-  // for inflate use constant limit in 65536 bytes
-  //
+// Use ordinary array, since untyped makes no boost here
+function makeTable() {
+  var c, table = [];
 
-  /* space at extra (only when reading header) */
-  // this.extra_max  = 0;
-  /* pointer to zero-terminated file name or Z_NULL */
-  this.name       = '';
-  /* space at name (only when reading header) */
-  // this.name_max   = 0;
-  /* pointer to zero-terminated comment or Z_NULL */
-  this.comment    = '';
-  /* space at comment (only when reading header) */
-  // this.comm_max   = 0;
-  /* true if there was or will be a header crc */
-  this.hcrc       = 0;
-  /* true when done reading gzip header (not used when writing a gzip file) */
-  this.done       = false;
+  for (var n = 0; n < 256; n++) {
+    c = n;
+    for (var k = 0; k < 8; k++) {
+      c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
+    }
+    table[n] = c;
+  }
+
+  return table;
 }
 
-module.exports = GZheader;
+// Create table on load. Just 255 signed longs. Not a problem.
+var crcTable = makeTable();
 
-},{}],170:[function(_dereq_,module,exports){
-'use strict';
 
-// See state defs from inflate.js
-var BAD = 30;       /* got a data error -- remain here until reset */
-var TYPE = 12;      /* i: waiting for type bits, including last-flag bit */
+function crc32(crc, buf, len, pos) {
+  var t = crcTable,
+      end = pos + len;
 
-/*
-   Decode literal, length, and distance codes and write out the resulting
-   literal and match bytes until either not enough input or output is
-   available, an end-of-block is encountered, or a data error is encountered.
-   When large enough input and output buffers are supplied to inflate(), for
-   example, a 16K input buffer and a 64K output buffer, more than 95% of the
-   inflate execution time is spent in this routine.
+  crc ^= -1;
 
-   Entry assumptions:
+  for (var i = pos; i < end; i++) {
+    crc = (crc >>> 8) ^ t[(crc ^ buf[i]) & 0xFF];
+  }
 
-        state.mode === LEN
-        strm.avail_in >= 6
-        strm.avail_out >= 258
-        start >= strm.avail_out
-        state.bits < 8
+  return (crc ^ (-1)); // >>> 0;
+}
 
-   On return, state.mode is one of:
 
-        LEN -- ran out of enough output space or enough available input
-        TYPE -- reached end of block code, inflate() to interpret next block
-        BAD -- error in block data
+module.exports = crc32;
 
-   Notes:
+},{}],172:[function(_dereq_,module,exports){
+'use strict';
 
-    - The maximum input bits used by a length/distance pair is 15 bits for the
-      length code, 5 bits for the length extra, 15 bits for the distance code,
-      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
-      Therefore if strm.avail_in >= 6, then there is enough input to avoid
-      checking for available input while decoding.
+var utils   = _dereq_('../utils/common');
+var trees   = _dereq_('./trees');
+var adler32 = _dereq_('./adler32');
+var crc32   = _dereq_('./crc32');
+var msg     = _dereq_('./messages');
 
-    - The maximum bytes that a single length/distance pair can output is 258
-      bytes, which is the maximum length that can be coded.  inflate_fast()
-      requires strm.avail_out >= 258 for each loop to avoid checking for
-      output space.
+/* Public constants ==========================================================*/
+/* ===========================================================================*/
+
+
+/* Allowed flush values; see deflate() and inflate() below for details */
+var Z_NO_FLUSH      = 0;
+var Z_PARTIAL_FLUSH = 1;
+//var Z_SYNC_FLUSH    = 2;
+var Z_FULL_FLUSH    = 3;
+var Z_FINISH        = 4;
+var Z_BLOCK         = 5;
+//var Z_TREES         = 6;
+
+
+/* Return codes for the compression/decompression functions. Negative values
+ * are errors, positive values are used for special but normal events.
  */
-module.exports = function inflate_fast(strm, start) {
-  var state;
-  var _in;                    /* local strm.input */
-  var last;                   /* have enough input while in < last */
-  var _out;                   /* local strm.output */
-  var beg;                    /* inflate()'s initial strm.output */
-  var end;                    /* while out < end, enough space available */
-//#ifdef INFLATE_STRICT
-  var dmax;                   /* maximum distance from zlib header */
-//#endif
-  var wsize;                  /* window size or zero if not using window */
-  var whave;                  /* valid bytes in the window */
-  var wnext;                  /* window write index */
-  // Use `s_window` instead `window`, avoid conflict with instrumentation tools
-  var s_window;               /* allocated sliding window, if wsize != 0 */
-  var hold;                   /* local strm.hold */
-  var bits;                   /* local strm.bits */
-  var lcode;                  /* local strm.lencode */
-  var dcode;                  /* local strm.distcode */
-  var lmask;                  /* mask for first level of length codes */
-  var dmask;                  /* mask for first level of distance codes */
-  var here;                   /* retrieved table entry */
-  var op;                     /* code bits, operation, extra bits, or */
-                              /*  window position, window bytes to copy */
-  var len;                    /* match length, unused bytes */
-  var dist;                   /* match distance */
-  var from;                   /* where to copy match from */
-  var from_source;
+var Z_OK            = 0;
+var Z_STREAM_END    = 1;
+//var Z_NEED_DICT     = 2;
+//var Z_ERRNO         = -1;
+var Z_STREAM_ERROR  = -2;
+var Z_DATA_ERROR    = -3;
+//var Z_MEM_ERROR     = -4;
+var Z_BUF_ERROR     = -5;
+//var Z_VERSION_ERROR = -6;
 
 
-  var input, output; // JS specific, because we have no pointers
+/* compression levels */
+//var Z_NO_COMPRESSION      = 0;
+//var Z_BEST_SPEED          = 1;
+//var Z_BEST_COMPRESSION    = 9;
+var Z_DEFAULT_COMPRESSION = -1;
 
-  /* copy state to local variables */
-  state = strm.state;
-  //here = state.here;
-  _in = strm.next_in;
-  input = strm.input;
-  last = _in + (strm.avail_in - 5);
-  _out = strm.next_out;
-  output = strm.output;
-  beg = _out - (start - strm.avail_out);
-  end = _out + (strm.avail_out - 257);
-//#ifdef INFLATE_STRICT
-  dmax = state.dmax;
-//#endif
-  wsize = state.wsize;
-  whave = state.whave;
-  wnext = state.wnext;
-  s_window = state.window;
-  hold = state.hold;
-  bits = state.bits;
-  lcode = state.lencode;
-  dcode = state.distcode;
-  lmask = (1 << state.lenbits) - 1;
-  dmask = (1 << state.distbits) - 1;
 
+var Z_FILTERED            = 1;
+var Z_HUFFMAN_ONLY        = 2;
+var Z_RLE                 = 3;
+var Z_FIXED               = 4;
+var Z_DEFAULT_STRATEGY    = 0;
 
-  /* decode literals and length/distances until end-of-block or not enough
-     input data or output space */
+/* Possible values of the data_type field (though see inflate()) */
+//var Z_BINARY              = 0;
+//var Z_TEXT                = 1;
+//var Z_ASCII               = 1; // = Z_TEXT
+var Z_UNKNOWN             = 2;
 
-  top:
-  do {
-    if (bits < 15) {
-      hold += input[_in++] << bits;
-      bits += 8;
-      hold += input[_in++] << bits;
-      bits += 8;
-    }
 
-    here = lcode[hold & lmask];
+/* The deflate compression method */
+var Z_DEFLATED  = 8;
 
-    dolen:
-    for (;;) { // Goto emulation
-      op = here >>> 24/*here.bits*/;
-      hold >>>= op;
-      bits -= op;
-      op = (here >>> 16) & 0xff/*here.op*/;
-      if (op === 0) {                          /* literal */
-        //Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
-        //        "inflate:         literal '%c'\n" :
-        //        "inflate:         literal 0x%02x\n", here.val));
-        output[_out++] = here & 0xffff/*here.val*/;
-      }
-      else if (op & 16) {                     /* length base */
-        len = here & 0xffff/*here.val*/;
-        op &= 15;                           /* number of extra bits */
-        if (op) {
-          if (bits < op) {
-            hold += input[_in++] << bits;
-            bits += 8;
-          }
-          len += hold & ((1 << op) - 1);
-          hold >>>= op;
-          bits -= op;
-        }
-        //Tracevv((stderr, "inflate:         length %u\n", len));
-        if (bits < 15) {
-          hold += input[_in++] << bits;
-          bits += 8;
-          hold += input[_in++] << bits;
-          bits += 8;
-        }
-        here = dcode[hold & dmask];
+/*============================================================================*/
 
-        dodist:
-        for (;;) { // goto emulation
-          op = here >>> 24/*here.bits*/;
-          hold >>>= op;
-          bits -= op;
-          op = (here >>> 16) & 0xff/*here.op*/;
 
-          if (op & 16) {                      /* distance base */
-            dist = here & 0xffff/*here.val*/;
-            op &= 15;                       /* number of extra bits */
-            if (bits < op) {
-              hold += input[_in++] << bits;
-              bits += 8;
-              if (bits < op) {
-                hold += input[_in++] << bits;
-                bits += 8;
-              }
-            }
-            dist += hold & ((1 << op) - 1);
-//#ifdef INFLATE_STRICT
-            if (dist > dmax) {
-              strm.msg = 'invalid distance too far back';
-              state.mode = BAD;
-              break top;
-            }
-//#endif
-            hold >>>= op;
-            bits -= op;
-            //Tracevv((stderr, "inflate:         distance %u\n", dist));
-            op = _out - beg;                /* max distance in output */
-            if (dist > op) {                /* see if copy from window */
-              op = dist - op;               /* distance back in window */
-              if (op > whave) {
-                if (state.sane) {
-                  strm.msg = 'invalid distance too far back';
-                  state.mode = BAD;
-                  break top;
-                }
+var MAX_MEM_LEVEL = 9;
+/* Maximum value for memLevel in deflateInit2 */
+var MAX_WBITS = 15;
+/* 32K LZ77 window */
+var DEF_MEM_LEVEL = 8;
 
-// (!) This block is disabled in zlib defailts,
-// don't enable it for binary compatibility
-//#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-//                if (len <= op - whave) {
-//                  do {
-//                    output[_out++] = 0;
-//                  } while (--len);
-//                  continue top;
-//                }
-//                len -= op - whave;
-//                do {
-//                  output[_out++] = 0;
-//                } while (--op > whave);
-//                if (op === 0) {
-//                  from = _out - dist;
-//                  do {
-//                    output[_out++] = output[from++];
-//                  } while (--len);
-//                  continue top;
-//                }
-//#endif
-              }
-              from = 0; // window index
-              from_source = s_window;
-              if (wnext === 0) {           /* very common case */
-                from += wsize - op;
-                if (op < len) {         /* some from window */
-                  len -= op;
-                  do {
-                    output[_out++] = s_window[from++];
-                  } while (--op);
-                  from = _out - dist;  /* rest from output */
-                  from_source = output;
-                }
-              }
-              else if (wnext < op) {      /* wrap around window */
-                from += wsize + wnext - op;
-                op -= wnext;
-                if (op < len) {         /* some from end of window */
-                  len -= op;
-                  do {
-                    output[_out++] = s_window[from++];
-                  } while (--op);
-                  from = 0;
-                  if (wnext < len) {  /* some from start of window */
-                    op = wnext;
-                    len -= op;
-                    do {
-                      output[_out++] = s_window[from++];
-                    } while (--op);
-                    from = _out - dist;      /* rest from output */
-                    from_source = output;
-                  }
-                }
-              }
-              else {                      /* contiguous in window */
-                from += wnext - op;
-                if (op < len) {         /* some from window */
-                  len -= op;
-                  do {
-                    output[_out++] = s_window[from++];
-                  } while (--op);
-                  from = _out - dist;  /* rest from output */
-                  from_source = output;
-                }
-              }
-              while (len > 2) {
-                output[_out++] = from_source[from++];
-                output[_out++] = from_source[from++];
-                output[_out++] = from_source[from++];
-                len -= 3;
-              }
-              if (len) {
-                output[_out++] = from_source[from++];
-                if (len > 1) {
-                  output[_out++] = from_source[from++];
-                }
-              }
-            }
-            else {
-              from = _out - dist;          /* copy direct from output */
-              do {                        /* minimum length is three */
-                output[_out++] = output[from++];
-                output[_out++] = output[from++];
-                output[_out++] = output[from++];
-                len -= 3;
-              } while (len > 2);
-              if (len) {
-                output[_out++] = output[from++];
-                if (len > 1) {
-                  output[_out++] = output[from++];
-                }
-              }
-            }
-          }
-          else if ((op & 64) === 0) {          /* 2nd level distance code */
-            here = dcode[(here & 0xffff)/*here.val*/ + (hold & ((1 << op) - 1))];
-            continue dodist;
-          }
-          else {
-            strm.msg = 'invalid distance code';
-            state.mode = BAD;
-            break top;
-          }
-
-          break; // need to emulate goto via "continue"
-        }
-      }
-      else if ((op & 64) === 0) {              /* 2nd level length code */
-        here = lcode[(here & 0xffff)/*here.val*/ + (hold & ((1 << op) - 1))];
-        continue dolen;
-      }
-      else if (op & 32) {                     /* end-of-block */
-        //Tracevv((stderr, "inflate:         end of block\n"));
-        state.mode = TYPE;
-        break top;
-      }
-      else {
-        strm.msg = 'invalid literal/length code';
-        state.mode = BAD;
-        break top;
-      }
-
-      break; // need to emulate goto via "continue"
-    }
-  } while (_in < last && _out < end);
 
-  /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
-  len = bits >> 3;
-  _in -= len;
-  bits -= len << 3;
-  hold &= (1 << bits) - 1;
+var LENGTH_CODES  = 29;
+/* number of length codes, not counting the special END_BLOCK code */
+var LITERALS      = 256;
+/* number of literal bytes 0..255 */
+var L_CODES       = LITERALS + 1 + LENGTH_CODES;
+/* number of Literal or Length codes, including the END_BLOCK code */
+var D_CODES       = 30;
+/* number of distance codes */
+var BL_CODES      = 19;
+/* number of codes used to transfer the bit lengths */
+var HEAP_SIZE     = 2 * L_CODES + 1;
+/* maximum heap size */
+var MAX_BITS  = 15;
+/* All codes must not exceed MAX_BITS bits */
 
-  /* update state and return */
-  strm.next_in = _in;
-  strm.next_out = _out;
-  strm.avail_in = (_in < last ? 5 + (last - _in) : 5 - (_in - last));
-  strm.avail_out = (_out < end ? 257 + (end - _out) : 257 - (_out - end));
-  state.hold = hold;
-  state.bits = bits;
-  return;
-};
+var MIN_MATCH = 3;
+var MAX_MATCH = 258;
+var MIN_LOOKAHEAD = (MAX_MATCH + MIN_MATCH + 1);
 
-},{}],171:[function(_dereq_,module,exports){
-'use strict';
+var PRESET_DICT = 0x20;
 
+var INIT_STATE = 42;
+var EXTRA_STATE = 69;
+var NAME_STATE = 73;
+var COMMENT_STATE = 91;
+var HCRC_STATE = 103;
+var BUSY_STATE = 113;
+var FINISH_STATE = 666;
 
-var utils         = _dereq_('../utils/common');
-var adler32       = _dereq_('./adler32');
-var crc32         = _dereq_('./crc32');
-var inflate_fast  = _dereq_('./inffast');
-var inflate_table = _dereq_('./inftrees');
+var BS_NEED_MORE      = 1; /* block not completed, need more input or more output */
+var BS_BLOCK_DONE     = 2; /* block flush performed */
+var BS_FINISH_STARTED = 3; /* finish started, need only more output at next deflate */
+var BS_FINISH_DONE    = 4; /* finish done, accept no more input or output */
 
-var CODES = 0;
-var LENS = 1;
-var DISTS = 2;
+var OS_CODE = 0x03; // Unix :) . Don't detect, use this default.
 
-/* Public constants ==========================================================*/
-/* ===========================================================================*/
+function err(strm, errorCode) {
+  strm.msg = msg[errorCode];
+  return errorCode;
+}
 
+function rank(f) {
+  return ((f) << 1) - ((f) > 4 ? 9 : 0);
+}
 
-/* Allowed flush values; see deflate() and inflate() below for details */
-//var Z_NO_FLUSH      = 0;
-//var Z_PARTIAL_FLUSH = 1;
-//var Z_SYNC_FLUSH    = 2;
-//var Z_FULL_FLUSH    = 3;
-var Z_FINISH        = 4;
-var Z_BLOCK         = 5;
-var Z_TREES         = 6;
+function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }
 
 
-/* Return codes for the compression/decompression functions. Negative values
- * are errors, positive values are used for special but normal events.
+/* =========================================================================
+ * Flush as much pending output as possible. All deflate() output goes
+ * through this function so some applications may wish to modify it
+ * to avoid allocating a large strm->output buffer and copying into it.
+ * (See also read_buf()).
  */
-var Z_OK            = 0;
-var Z_STREAM_END    = 1;
-var Z_NEED_DICT     = 2;
-//var Z_ERRNO         = -1;
-var Z_STREAM_ERROR  = -2;
-var Z_DATA_ERROR    = -3;
-var Z_MEM_ERROR     = -4;
-var Z_BUF_ERROR     = -5;
-//var Z_VERSION_ERROR = -6;
+function flush_pending(strm) {
+  var s = strm.state;
 
-/* The deflate compression method */
-var Z_DEFLATED  = 8;
+  //_tr_flush_bits(s);
+  var len = s.pending;
+  if (len > strm.avail_out) {
+    len = strm.avail_out;
+  }
+  if (len === 0) { return; }
 
+  utils.arraySet(strm.output, s.pending_buf, s.pending_out, len, strm.next_out);
+  strm.next_out += len;
+  s.pending_out += len;
+  strm.total_out += len;
+  strm.avail_out -= len;
+  s.pending -= len;
+  if (s.pending === 0) {
+    s.pending_out = 0;
+  }
+}
 
-/* STATES ====================================================================*/
-/* ===========================================================================*/
 
+function flush_block_only(s, last) {
+  trees._tr_flush_block(s, (s.block_start >= 0 ? s.block_start : -1), s.strstart - s.block_start, last);
+  s.block_start = s.strstart;
+  flush_pending(s.strm);
+}
 
-var    HEAD = 1;       /* i: waiting for magic header */
-var    FLAGS = 2;      /* i: waiting for method and flags (gzip) */
-var    TIME = 3;       /* i: waiting for modification time (gzip) */
-var    OS = 4;         /* i: waiting for extra flags and operating system (gzip) */
-var    EXLEN = 5;      /* i: waiting for extra length (gzip) */
-var    EXTRA = 6;      /* i: waiting for extra bytes (gzip) */
-var    NAME = 7;       /* i: waiting for end of file name (gzip) */
-var    COMMENT = 8;    /* i: waiting for end of comment (gzip) */
-var    HCRC = 9;       /* i: waiting for header crc (gzip) */
-var    DICTID = 10;    /* i: waiting for dictionary check value */
-var    DICT = 11;      /* waiting for inflateSetDictionary() call */
-var        TYPE = 12;      /* i: waiting for type bits, including last-flag bit */
-var        TYPEDO = 13;    /* i: same, but skip check to exit inflate on new block */
-var        STORED = 14;    /* i: waiting for stored size (length and complement) */
-var        COPY_ = 15;     /* i/o: same as COPY below, but only first time in */
-var        COPY = 16;      /* i/o: waiting for input or output to copy stored block */
-var        TABLE = 17;     /* i: waiting for dynamic block table lengths */
-var        LENLENS = 18;   /* i: waiting for code length code lengths */
-var        CODELENS = 19;  /* i: waiting for length/lit and distance code lengths */
-var            LEN_ = 20;      /* i: same as LEN below, but only first time in */
-var            LEN = 21;       /* i: waiting for length/lit/eob code */
-var            LENEXT = 22;    /* i: waiting for length extra bits */
-var            DIST = 23;      /* i: waiting for distance code */
-var            DISTEXT = 24;   /* i: waiting for distance extra bits */
-var            MATCH = 25;     /* o: waiting for output space to copy string */
-var            LIT = 26;       /* o: waiting for output space to write literal */
-var    CHECK = 27;     /* i: waiting for 32-bit check value */
-var    LENGTH = 28;    /* i: waiting for 32-bit length (gzip) */
-var    DONE = 29;      /* finished check, done -- remain here until reset */
-var    BAD = 30;       /* got a data error -- remain here until reset */
-var    MEM = 31;       /* got an inflate() memory error -- remain here until reset */
-var    SYNC = 32;      /* looking for synchronization bytes to restart inflate() */
 
-/* ===========================================================================*/
+function put_byte(s, b) {
+  s.pending_buf[s.pending++] = b;
+}
 
 
+/* =========================================================================
+ * Put a short in the pending buffer. The 16-bit value is put in MSB order.
+ * IN assertion: the stream state is correct and there is enough room in
+ * pending_buf.
+ */
+function putShortMSB(s, b) {
+//  put_byte(s, (Byte)(b >> 8));
+//  put_byte(s, (Byte)(b & 0xff));
+  s.pending_buf[s.pending++] = (b >>> 8) & 0xff;
+  s.pending_buf[s.pending++] = b & 0xff;
+}
 
-var ENOUGH_LENS = 852;
-var ENOUGH_DISTS = 592;
-//var ENOUGH =  (ENOUGH_LENS+ENOUGH_DISTS);
 
-var MAX_WBITS = 15;
-/* 32K LZ77 window */
-var DEF_WBITS = MAX_WBITS;
+/* ===========================================================================
+ * Read a new buffer from the current input stream, update the adler32
+ * and total number of bytes read.  All deflate() input goes through
+ * this function so some applications may wish to modify it to avoid
+ * allocating a large strm->input buffer and copying from it.
+ * (See also flush_pending()).
+ */
+function read_buf(strm, buf, start, size) {
+  var len = strm.avail_in;
 
+  if (len > size) { len = size; }
+  if (len === 0) { return 0; }
 
-function zswap32(q) {
-  return  (((q >>> 24) & 0xff) +
-          ((q >>> 8) & 0xff00) +
-          ((q & 0xff00) << 8) +
-          ((q & 0xff) << 24));
-}
+  strm.avail_in -= len;
 
+  // zmemcpy(buf, strm->next_in, len);
+  utils.arraySet(buf, strm.input, strm.next_in, len, start);
+  if (strm.state.wrap === 1) {
+    strm.adler = adler32(strm.adler, buf, len, start);
+  }
 
-function InflateState() {
-  this.mode = 0;             /* current inflate mode */
-  this.last = false;          /* true if processing last block */
-  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */
-  this.havedict = false;      /* true if dictionary provided */
-  this.flags = 0;             /* gzip header method and flags (0 if zlib) */
-  this.dmax = 0;              /* zlib header max distance (INFLATE_STRICT) */
-  this.check = 0;             /* protected copy of check value */
-  this.total = 0;             /* protected copy of output count */
-  // TODO: may be {}
-  this.head = null;           /* where to save gzip header information */
+  else if (strm.state.wrap === 2) {
+    strm.adler = crc32(strm.adler, buf, len, start);
+  }
 
-  /* sliding window */
-  this.wbits = 0;             /* log base 2 of requested window size */
-  this.wsize = 0;             /* window size or zero if not using window */
-  this.whave = 0;             /* valid bytes in the window */
-  this.wnext = 0;             /* window write index */
-  this.window = null;         /* allocated sliding window, if needed */
+  strm.next_in += len;
+  strm.total_in += len;
 
-  /* bit accumulator */
-  this.hold = 0;              /* input bit accumulator */
-  this.bits = 0;              /* number of bits in "in" */
+  return len;
+}
 
-  /* for string and stored block copying */
-  this.length = 0;            /* literal or length of data to copy */
-  this.offset = 0;            /* distance back to copy string from */
 
-  /* for table and code decoding */
-  this.extra = 0;             /* extra bits needed */
+/* ===========================================================================
+ * Set match_start to the longest match starting at the given string and
+ * return its length. Matches shorter or equal to prev_length are discarded,
+ * in which case the result is equal to prev_length and match_start is
+ * garbage.
+ * IN assertions: cur_match is the head of the hash chain for the current
+ *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
+ * OUT assertion: the match length is not greater than s->lookahead.
+ */
+function longest_match(s, cur_match) {
+  var chain_length = s.max_chain_length;      /* max hash chain length */
+  var scan = s.strstart; /* current string */
+  var match;                       /* matched string */
+  var len;                           /* length of current match */
+  var best_len = s.prev_length;              /* best match length so far */
+  var nice_match = s.nice_match;             /* stop if match long enough */
+  var limit = (s.strstart > (s.w_size - MIN_LOOKAHEAD)) ?
+      s.strstart - (s.w_size - MIN_LOOKAHEAD) : 0/*NIL*/;
 
-  /* fixed and dynamic code tables */
-  this.lencode = null;          /* starting table for length/literal codes */
-  this.distcode = null;         /* starting table for distance codes */
-  this.lenbits = 0;           /* index bits for lencode */
-  this.distbits = 0;          /* index bits for distcode */
+  var _win = s.window; // shortcut
 
-  /* dynamic table building */
-  this.ncode = 0;             /* number of code length code lengths */
-  this.nlen = 0;              /* number of length code lengths */
-  this.ndist = 0;             /* number of distance code lengths */
-  this.have = 0;              /* number of code lengths in lens[] */
-  this.next = null;              /* next available space in codes[] */
+  var wmask = s.w_mask;
+  var prev  = s.prev;
 
-  this.lens = new utils.Buf16(320); /* temporary storage for code lengths */
-  this.work = new utils.Buf16(288); /* work area for code table building */
+  /* Stop when cur_match becomes <= limit. To simplify the code,
+   * we prevent matches with the string of window index 0.
+   */
 
-  /*
-   because we don't have pointers in js, we use lencode and distcode directly
-   as buffers so we don't need codes
-  */
-  //this.codes = new utils.Buf32(ENOUGH);       /* space for code tables */
-  this.lendyn = null;              /* dynamic table for length/literal codes (JS specific) */
-  this.distdyn = null;             /* dynamic table for distance codes (JS specific) */
-  this.sane = 0;                   /* if false, allow invalid distance too far */
-  this.back = 0;                   /* bits back of last unprocessed length/lit */
-  this.was = 0;                    /* initial length of match */
-}
+  var strend = s.strstart + MAX_MATCH;
+  var scan_end1  = _win[scan + best_len - 1];
+  var scan_end   = _win[scan + best_len];
 
-function inflateResetKeep(strm) {
-  var state;
+  /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
+   * It is easy to get rid of this optimization if necessary.
+   */
+  // Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
 
-  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
-  state = strm.state;
-  strm.total_in = strm.total_out = state.total = 0;
-  strm.msg = ''; /*Z_NULL*/
-  if (state.wrap) {       /* to support ill-conceived Java test suite */
-    strm.adler = state.wrap & 1;
+  /* Do not waste too much time if we already have a good match: */
+  if (s.prev_length >= s.good_match) {
+    chain_length >>= 2;
   }
-  state.mode = HEAD;
-  state.last = 0;
-  state.havedict = 0;
-  state.dmax = 32768;
-  state.head = null/*Z_NULL*/;
-  state.hold = 0;
-  state.bits = 0;
-  //state.lencode = state.distcode = state.next = state.codes;
-  state.lencode = state.lendyn = new utils.Buf32(ENOUGH_LENS);
-  state.distcode = state.distdyn = new utils.Buf32(ENOUGH_DISTS);
-
-  state.sane = 1;
-  state.back = -1;
-  //Tracev((stderr, "inflate: reset\n"));
-  return Z_OK;
-}
-
-function inflateReset(strm) {
-  var state;
-
-  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
-  state = strm.state;
-  state.wsize = 0;
-  state.whave = 0;
-  state.wnext = 0;
-  return inflateResetKeep(strm);
+  /* Do not look for matches beyond the end of the input. This is necessary
+   * to make deflate deterministic.
+   */
+  if (nice_match > s.lookahead) { nice_match = s.lookahead; }
 
-}
+  // Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
 
-function inflateReset2(strm, windowBits) {
-  var wrap;
-  var state;
+  do {
+    // Assert(cur_match < s->strstart, "no future");
+    match = cur_match;
 
-  /* get the state */
-  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
-  state = strm.state;
+    /* Skip to next match if the match length cannot increase
+     * or if the match length is less than 2.  Note that the checks below
+     * for insufficient lookahead only occur occasionally for performance
+     * reasons.  Therefore uninitialized memory will be accessed, and
+     * conditional jumps will be made that depend on those values.
+     * However the length of the match is limited to the lookahead, so
+     * the output of deflate is not affected by the uninitialized values.
+     */
 
-  /* extract wrap request from windowBits parameter */
-  if (windowBits < 0) {
-    wrap = 0;
-    windowBits = -windowBits;
-  }
-  else {
-    wrap = (windowBits >> 4) + 1;
-    if (windowBits < 48) {
-      windowBits &= 15;
+    if (_win[match + best_len]     !== scan_end  ||
+        _win[match + best_len - 1] !== scan_end1 ||
+        _win[match]                !== _win[scan] ||
+        _win[++match]              !== _win[scan + 1]) {
+      continue;
     }
-  }
 
-  /* set number of window bits, free window if different */
-  if (windowBits && (windowBits < 8 || windowBits > 15)) {
-    return Z_STREAM_ERROR;
-  }
-  if (state.window !== null && state.wbits !== windowBits) {
-    state.window = null;
-  }
+    /* The check at best_len-1 can be removed because it will be made
+     * again later. (This heuristic is not always a win.)
+     * It is not necessary to compare scan[2] and match[2] since they
+     * are always equal when the other bytes match, given that
+     * the hash keys are equal and that HASH_BITS >= 8.
+     */
+    scan += 2;
+    match++;
+    // Assert(*scan == *match, "match[2]?");
 
-  /* update state and reset the rest of it */
-  state.wrap = wrap;
-  state.wbits = windowBits;
-  return inflateReset(strm);
-}
+    /* We check for insufficient lookahead only every 8th comparison;
+     * the 256th check will be made at strstart+258.
+     */
+    do {
+      /*jshint noempty:false*/
+    } while (_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
+             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
+             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
+             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
+             scan < strend);
 
-function inflateInit2(strm, windowBits) {
-  var ret;
-  var state;
+    // Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
 
-  if (!strm) { return Z_STREAM_ERROR; }
-  //strm.msg = Z_NULL;                 /* in case we return an error */
+    len = MAX_MATCH - (strend - scan);
+    scan = strend - MAX_MATCH;
 
-  state = new InflateState();
+    if (len > best_len) {
+      s.match_start = cur_match;
+      best_len = len;
+      if (len >= nice_match) {
+        break;
+      }
+      scan_end1  = _win[scan + best_len - 1];
+      scan_end   = _win[scan + best_len];
+    }
+  } while ((cur_match = prev[cur_match & wmask]) > limit && --chain_length !== 0);
 
-  //if (state === Z_NULL) return Z_MEM_ERROR;
-  //Tracev((stderr, "inflate: allocated\n"));
-  strm.state = state;
-  state.window = null/*Z_NULL*/;
-  ret = inflateReset2(strm, windowBits);
-  if (ret !== Z_OK) {
-    strm.state = null/*Z_NULL*/;
+  if (best_len <= s.lookahead) {
+    return best_len;
   }
-  return ret;
-}
-
-function inflateInit(strm) {
-  return inflateInit2(strm, DEF_WBITS);
+  return s.lookahead;
 }
 
 
-/*
- Return state with length and distance decoding tables and index sizes set to
- fixed code decoding.  Normally this returns fixed tables from inffixed.h.
- If BUILDFIXED is defined, then instead this routine builds the tables the
- first time it's called, and returns those tables the first time and
- thereafter.  This reduces the size of the code by about 2K bytes, in
- exchange for a little execution time.  However, BUILDFIXED should not be
- used for threaded applications, since the rewriting of the tables and virgin
- may not be thread-safe.
+/* ===========================================================================
+ * Fill the window when the lookahead becomes insufficient.
+ * Updates strstart and lookahead.
+ *
+ * IN assertion: lookahead < MIN_LOOKAHEAD
+ * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
+ *    At least one byte has been read, or avail_in == 0; reads are
+ *    performed for at least two bytes (required for the zip translate_eol
+ *    option -- not supported here).
  */
-var virgin = true;
+function fill_window(s) {
+  var _w_size = s.w_size;
+  var p, n, m, more, str;
 
-var lenfix, distfix; // We have no pointers in JS, so keep tables separate
+  //Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
 
-function fixedtables(state) {
-  /* build fixed huffman tables if first call (may not be thread safe) */
-  if (virgin) {
-    var sym;
+  do {
+    more = s.window_size - s.lookahead - s.strstart;
 
-    lenfix = new utils.Buf32(512);
-    distfix = new utils.Buf32(32);
+    // JS ints have 32 bit, block below not needed
+    /* Deal with !@#$% 64K limit: */
+    //if (sizeof(int) <= 2) {
+    //    if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
+    //        more = wsize;
+    //
+    //  } else if (more == (unsigned)(-1)) {
+    //        /* Very unlikely, but possible on 16 bit machine if
+    //         * strstart == 0 && lookahead == 1 (input done a byte at time)
+    //         */
+    //        more--;
+    //    }
+    //}
 
-    /* literal/length table */
-    sym = 0;
-    while (sym < 144) { state.lens[sym++] = 8; }
-    while (sym < 256) { state.lens[sym++] = 9; }
-    while (sym < 280) { state.lens[sym++] = 7; }
-    while (sym < 288) { state.lens[sym++] = 8; }
 
-    inflate_table(LENS,  state.lens, 0, 288, lenfix,   0, state.work, { bits: 9 });
+    /* If the window is almost full and there is insufficient lookahead,
+     * move the upper half to the lower one to make room in the upper half.
+     */
+    if (s.strstart >= _w_size + (_w_size - MIN_LOOKAHEAD)) {
 
-    /* distance table */
-    sym = 0;
-    while (sym < 32) { state.lens[sym++] = 5; }
+      utils.arraySet(s.window, s.window, _w_size, _w_size, 0);
+      s.match_start -= _w_size;
+      s.strstart -= _w_size;
+      /* we now have strstart >= MAX_DIST */
+      s.block_start -= _w_size;
 
-    inflate_table(DISTS, state.lens, 0, 32,   distfix, 0, state.work, { bits: 5 });
+      /* Slide the hash table (could be avoided with 32 bit values
+       at the expense of memory usage). We slide even when level == 0
+       to keep the hash table consistent if we switch back to level > 0
+       later. (Using level 0 permanently is not an optimal usage of
+       zlib, so we don't care about this pathological case.)
+       */
 
-    /* do this just once */
-    virgin = false;
-  }
+      n = s.hash_size;
+      p = n;
+      do {
+        m = s.head[--p];
+        s.head[p] = (m >= _w_size ? m - _w_size : 0);
+      } while (--n);
 
-  state.lencode = lenfix;
-  state.lenbits = 9;
-  state.distcode = distfix;
-  state.distbits = 5;
-}
+      n = _w_size;
+      p = n;
+      do {
+        m = s.prev[--p];
+        s.prev[p] = (m >= _w_size ? m - _w_size : 0);
+        /* If n is not on any hash chain, prev[n] is garbage but
+         * its value will never be used.
+         */
+      } while (--n);
 
+      more += _w_size;
+    }
+    if (s.strm.avail_in === 0) {
+      break;
+    }
 
-/*
- Update the window with the last wsize (normally 32K) bytes written before
- returning.  If window does not exist yet, create it.  This is only called
- when a window is already in use, or when output has been written during this
- inflate call, but the end of the deflate stream has not been reached yet.
- It is also called to create a window for dictionary data when a dictionary
- is loaded.
+    /* If there was no sliding:
+     *    strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
+     *    more == window_size - lookahead - strstart
+     * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
+     * => more >= window_size - 2*WSIZE + 2
+     * In the BIG_MEM or MMAP case (not yet supported),
+     *   window_size == input_size + MIN_LOOKAHEAD  &&
+     *   strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
+     * Otherwise, window_size == 2*WSIZE so more >= 2.
+     * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
+     */
+    //Assert(more >= 2, "more < 2");
+    n = read_buf(s.strm, s.window, s.strstart + s.lookahead, more);
+    s.lookahead += n;
 
- Providing output buffers larger than 32K to inflate() should provide a speed
- advantage, since only the last 32K of output is copied to the sliding window
- upon return from inflate(), and since all distances after the first 32K of
- output will fall in the output data, making match copies simpler and faster.
- The advantage may be dependent on the size of the processor's data caches.
- */
-function updatewindow(strm, src, end, copy) {
-  var dist;
-  var state = strm.state;
+    /* Initialize the hash value now that we have some input: */
+    if (s.lookahead + s.insert >= MIN_MATCH) {
+      str = s.strstart - s.insert;
+      s.ins_h = s.window[str];
 
-  /* if it hasn't been done already, allocate space for the window */
-  if (state.window === null) {
-    state.wsize = 1 << state.wbits;
-    state.wnext = 0;
-    state.whave = 0;
+      /* UPDATE_HASH(s, s->ins_h, s->window[str + 1]); */
+      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + 1]) & s.hash_mask;
+//#if MIN_MATCH != 3
+//        Call update_hash() MIN_MATCH-3 more times
+//#endif
+      while (s.insert) {
+        /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
+        s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;
 
-    state.window = new utils.Buf8(state.wsize);
-  }
+        s.prev[str & s.w_mask] = s.head[s.ins_h];
+        s.head[s.ins_h] = str;
+        str++;
+        s.insert--;
+        if (s.lookahead + s.insert < MIN_MATCH) {
+          break;
+        }
+      }
+    }
+    /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
+     * but this is not important since only literal bytes will be emitted.
+     */
 
-  /* copy state->wsize or less output bytes into the circular window */
-  if (copy >= state.wsize) {
-    utils.arraySet(state.window, src, end - state.wsize, state.wsize, 0);
-    state.wnext = 0;
-    state.whave = state.wsize;
+  } while (s.lookahead < MIN_LOOKAHEAD && s.strm.avail_in !== 0);
+
+  /* If the WIN_INIT bytes after the end of the current data have never been
+   * written, then zero those bytes in order to avoid memory check reports of
+   * the use of uninitialized (or uninitialised as Julian writes) bytes by
+   * the longest match routines.  Update the high water mark for the next
+   * time through here.  WIN_INIT is set to MAX_MATCH since the longest match
+   * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
+   */
+//  if (s.high_water < s.window_size) {
+//    var curr = s.strstart + s.lookahead;
+//    var init = 0;
+//
+//    if (s.high_water < curr) {
+//      /* Previous high water mark below current data -- zero WIN_INIT
+//       * bytes or up to end of window, whichever is less.
+//       */
+//      init = s.window_size - curr;
+//      if (init > WIN_INIT)
+//        init = WIN_INIT;
+//      zmemzero(s->window + curr, (unsigned)init);
+//      s->high_water = curr + init;
+//    }
+//    else if (s->high_water < (ulg)curr + WIN_INIT) {
+//      /* High water mark at or above current data, but below current data
+//       * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
+//       * to end of window, whichever is less.
+//       */
+//      init = (ulg)curr + WIN_INIT - s->high_water;
+//      if (init > s->window_size - s->high_water)
+//        init = s->window_size - s->high_water;
+//      zmemzero(s->window + s->high_water, (unsigned)init);
+//      s->high_water += init;
+//    }
+//  }
+//
+//  Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
+//    "not enough room for search");
+}
+
+/* ===========================================================================
+ * Copy without compression as much as possible from the input stream, return
+ * the current block state.
+ * This function does not insert new strings in the dictionary since
+ * uncompressible data is probably not useful. This function is used
+ * only for the level=0 compression option.
+ * NOTE: this function should be optimized to avoid extra copying from
+ * window to pending_buf.
+ */
+function deflate_stored(s, flush) {
+  /* Stored blocks are limited to 0xffff bytes, pending_buf is limited
+   * to pending_buf_size, and each stored block has a 5 byte header:
+   */
+  var max_block_size = 0xffff;
+
+  if (max_block_size > s.pending_buf_size - 5) {
+    max_block_size = s.pending_buf_size - 5;
   }
-  else {
-    dist = state.wsize - state.wnext;
-    if (dist > copy) {
-      dist = copy;
-    }
-    //zmemcpy(state->window + state->wnext, end - copy, dist);
-    utils.arraySet(state.window, src, end - copy, dist, state.wnext);
-    copy -= dist;
-    if (copy) {
-      //zmemcpy(state->window, end - copy, copy);
-      utils.arraySet(state.window, src, end - copy, copy, 0);
-      state.wnext = copy;
-      state.whave = state.wsize;
-    }
-    else {
-      state.wnext += dist;
-      if (state.wnext === state.wsize) { state.wnext = 0; }
-      if (state.whave < state.wsize) { state.whave += dist; }
+
+  /* Copy as much as possible from input to output: */
+  for (;;) {
+    /* Fill the window as much as possible: */
+    if (s.lookahead <= 1) {
+
+      //Assert(s->strstart < s->w_size+MAX_DIST(s) ||
+      //  s->block_start >= (long)s->w_size, "slide too late");
+//      if (!(s.strstart < s.w_size + (s.w_size - MIN_LOOKAHEAD) ||
+//        s.block_start >= s.w_size)) {
+//        throw  new Error("slide too late");
+//      }
+
+      fill_window(s);
+      if (s.lookahead === 0 && flush === Z_NO_FLUSH) {
+        return BS_NEED_MORE;
+      }
+
+      if (s.lookahead === 0) {
+        break;
+      }
+      /* flush the current block */
     }
-  }
-  return 0;
-}
+    //Assert(s->block_start >= 0L, "block gone");
+//    if (s.block_start < 0) throw new Error("block gone");
 
-function inflate(strm, flush) {
-  var state;
-  var input, output;          // input/output buffers
-  var next;                   /* next input INDEX */
-  var put;                    /* next output INDEX */
-  var have, left;             /* available input and output */
-  var hold;                   /* bit buffer */
-  var bits;                   /* bits in bit buffer */
-  var _in, _out;              /* save starting available input and output */
-  var copy;                   /* number of stored or match bytes to copy */
-  var from;                   /* where to copy match bytes from */
-  var from_source;
-  var here = 0;               /* current decoding table entry */
-  var here_bits, here_op, here_val; // paked "here" denormalized (JS specific)
-  //var last;                   /* parent table entry */
-  var last_bits, last_op, last_val; // paked "last" denormalized (JS specific)
-  var len;                    /* length to copy for repeats, bits to drop */
-  var ret;                    /* return code */
-  var hbuf = new utils.Buf8(4);    /* buffer for gzip header crc calculation */
-  var opts;
+    s.strstart += s.lookahead;
+    s.lookahead = 0;
 
-  var n; // temporary var for NEED_BITS
+    /* Emit a stored block if pending_buf will be full: */
+    var max_start = s.block_start + max_block_size;
 
-  var order = /* permutation of code lengths */
-    [ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ];
+    if (s.strstart === 0 || s.strstart >= max_start) {
+      /* strstart == 0 is possible when wraparound on 16-bit machine */
+      s.lookahead = s.strstart - max_start;
+      s.strstart = max_start;
+      /*** FLUSH_BLOCK(s, 0); ***/
+      flush_block_only(s, false);
+      if (s.strm.avail_out === 0) {
+        return BS_NEED_MORE;
+      }
+      /***/
 
 
-  if (!strm || !strm.state || !strm.output ||
-      (!strm.input && strm.avail_in !== 0)) {
-    return Z_STREAM_ERROR;
+    }
+    /* Flush if we may have to slide, otherwise block_start may become
+     * negative and the data will be gone:
+     */
+    if (s.strstart - s.block_start >= (s.w_size - MIN_LOOKAHEAD)) {
+      /*** FLUSH_BLOCK(s, 0); ***/
+      flush_block_only(s, false);
+      if (s.strm.avail_out === 0) {
+        return BS_NEED_MORE;
+      }
+      /***/
+    }
   }
 
-  state = strm.state;
-  if (state.mode === TYPE) { state.mode = TYPEDO; }    /* skip check */
+  s.insert = 0;
 
+  if (flush === Z_FINISH) {
+    /*** FLUSH_BLOCK(s, 1); ***/
+    flush_block_only(s, true);
+    if (s.strm.avail_out === 0) {
+      return BS_FINISH_STARTED;
+    }
+    /***/
+    return BS_FINISH_DONE;
+  }
 
-  //--- LOAD() ---
-  put = strm.next_out;
-  output = strm.output;
-  left = strm.avail_out;
-  next = strm.next_in;
-  input = strm.input;
-  have = strm.avail_in;
-  hold = state.hold;
-  bits = state.bits;
-  //---
+  if (s.strstart > s.block_start) {
+    /*** FLUSH_BLOCK(s, 0); ***/
+    flush_block_only(s, false);
+    if (s.strm.avail_out === 0) {
+      return BS_NEED_MORE;
+    }
+    /***/
+  }
 
-  _in = have;
-  _out = left;
-  ret = Z_OK;
+  return BS_NEED_MORE;
+}
+
+/* ===========================================================================
+ * Compress as much as possible from the input stream, return the current
+ * block state.
+ * This function does not perform lazy evaluation of matches and inserts
+ * new strings in the dictionary only for unmatched strings or for short
+ * matches. It is used only for the fast compression options.
+ */
+function deflate_fast(s, flush) {
+  var hash_head;        /* head of the hash chain */
+  var bflush;           /* set if current block must be flushed */
 
-  inf_leave: // goto emulation
   for (;;) {
-    switch (state.mode) {
-    case HEAD:
-      if (state.wrap === 0) {
-        state.mode = TYPEDO;
-        break;
+    /* Make sure that we always have enough lookahead, except
+     * at the end of the input file. We need MAX_MATCH bytes
+     * for the next match, plus MIN_MATCH bytes to insert the
+     * string following the next match.
+     */
+    if (s.lookahead < MIN_LOOKAHEAD) {
+      fill_window(s);
+      if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
+        return BS_NEED_MORE;
       }
-      //=== NEEDBITS(16);
-      while (bits < 16) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
+      if (s.lookahead === 0) {
+        break; /* flush the current block */
       }
-      //===//
-      if ((state.wrap & 2) && hold === 0x8b1f) {  /* gzip header */
-        state.check = 0/*crc32(0L, Z_NULL, 0)*/;
-        //=== CRC2(state.check, hold);
-        hbuf[0] = hold & 0xff;
-        hbuf[1] = (hold >>> 8) & 0xff;
-        state.check = crc32(state.check, hbuf, 2, 0);
-        //===//
+    }
 
-        //=== INITBITS();
-        hold = 0;
-        bits = 0;
-        //===//
-        state.mode = FLAGS;
-        break;
+    /* Insert the string window[strstart .. strstart+2] in the
+     * dictionary, and set hash_head to the head of the hash chain:
+     */
+    hash_head = 0/*NIL*/;
+    if (s.lookahead >= MIN_MATCH) {
+      /*** INSERT_STRING(s, s.strstart, hash_head); ***/
+      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
+      hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
+      s.head[s.ins_h] = s.strstart;
+      /***/
+    }
+
+    /* Find the longest match, discarding those <= prev_length.
+     * At this point we have always match_length < MIN_MATCH
+     */
+    if (hash_head !== 0/*NIL*/ && ((s.strstart - hash_head) <= (s.w_size - MIN_LOOKAHEAD))) {
+      /* To simplify the code, we prevent matches with the string
+       * of window index 0 (in particular we have to avoid a match
+       * of the string with itself at the start of the input file).
+       */
+      s.match_length = longest_match(s, hash_head);
+      /* longest_match() sets match_start */
+    }
+    if (s.match_length >= MIN_MATCH) {
+      // check_match(s, s.strstart, s.match_start, s.match_length); // for debug only
+
+      /*** _tr_tally_dist(s, s.strstart - s.match_start,
+                     s.match_length - MIN_MATCH, bflush); ***/
+      bflush = trees._tr_tally(s, s.strstart - s.match_start, s.match_length - MIN_MATCH);
+
+      s.lookahead -= s.match_length;
+
+      /* Insert new strings in the hash table only if the match length
+       * is not too large. This saves time but degrades compression.
+       */
+      if (s.match_length <= s.max_lazy_match/*max_insert_length*/ && s.lookahead >= MIN_MATCH) {
+        s.match_length--; /* string at strstart already in table */
+        do {
+          s.strstart++;
+          /*** INSERT_STRING(s, s.strstart, hash_head); ***/
+          s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
+          hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
+          s.head[s.ins_h] = s.strstart;
+          /***/
+          /* strstart never exceeds WSIZE-MAX_MATCH, so there are
+           * always MIN_MATCH bytes ahead.
+           */
+        } while (--s.match_length !== 0);
+        s.strstart++;
+      } else
+      {
+        s.strstart += s.match_length;
+        s.match_length = 0;
+        s.ins_h = s.window[s.strstart];
+        /* UPDATE_HASH(s, s.ins_h, s.window[s.strstart+1]); */
+        s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + 1]) & s.hash_mask;
+
+//#if MIN_MATCH != 3
+//                Call UPDATE_HASH() MIN_MATCH-3 more times
+//#endif
+        /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
+         * matter since it will be recomputed at next deflate call.
+         */
       }
-      state.flags = 0;           /* expect zlib header */
-      if (state.head) {
-        state.head.done = false;
+    } else {
+      /* No match, output a literal byte */
+      //Tracevv((stderr,"%c", s.window[s.strstart]));
+      /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
+      bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
+
+      s.lookahead--;
+      s.strstart++;
+    }
+    if (bflush) {
+      /*** FLUSH_BLOCK(s, 0); ***/
+      flush_block_only(s, false);
+      if (s.strm.avail_out === 0) {
+        return BS_NEED_MORE;
       }
-      if (!(state.wrap & 1) ||   /* check if zlib header allowed */
-        (((hold & 0xff)/*BITS(8)*/ << 8) + (hold >> 8)) % 31) {
-        strm.msg = 'incorrect header check';
-        state.mode = BAD;
-        break;
-      }
-      if ((hold & 0x0f)/*BITS(4)*/ !== Z_DEFLATED) {
-        strm.msg = 'unknown compression method';
-        state.mode = BAD;
-        break;
-      }
-      //--- DROPBITS(4) ---//
-      hold >>>= 4;
-      bits -= 4;
-      //---//
-      len = (hold & 0x0f)/*BITS(4)*/ + 8;
-      if (state.wbits === 0) {
-        state.wbits = len;
-      }
-      else if (len > state.wbits) {
-        strm.msg = 'invalid window size';
-        state.mode = BAD;
-        break;
-      }
-      state.dmax = 1 << len;
-      //Tracev((stderr, "inflate:   zlib header ok\n"));
-      strm.adler = state.check = 1/*adler32(0L, Z_NULL, 0)*/;
-      state.mode = hold & 0x200 ? DICTID : TYPE;
-      //=== INITBITS();
-      hold = 0;
-      bits = 0;
-      //===//
-      break;
-    case FLAGS:
-      //=== NEEDBITS(16); */
-      while (bits < 16) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-      }
-      //===//
-      state.flags = hold;
-      if ((state.flags & 0xff) !== Z_DEFLATED) {
-        strm.msg = 'unknown compression method';
-        state.mode = BAD;
-        break;
-      }
-      if (state.flags & 0xe000) {
-        strm.msg = 'unknown header flags set';
-        state.mode = BAD;
-        break;
-      }
-      if (state.head) {
-        state.head.text = ((hold >> 8) & 1);
-      }
-      if (state.flags & 0x0200) {
-        //=== CRC2(state.check, hold);
-        hbuf[0] = hold & 0xff;
-        hbuf[1] = (hold >>> 8) & 0xff;
-        state.check = crc32(state.check, hbuf, 2, 0);
-        //===//
-      }
-      //=== INITBITS();
-      hold = 0;
-      bits = 0;
-      //===//
-      state.mode = TIME;
-      /* falls through */
-    case TIME:
-      //=== NEEDBITS(32); */
-      while (bits < 32) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-      }
-      //===//
-      if (state.head) {
-        state.head.time = hold;
-      }
-      if (state.flags & 0x0200) {
-        //=== CRC4(state.check, hold)
-        hbuf[0] = hold & 0xff;
-        hbuf[1] = (hold >>> 8) & 0xff;
-        hbuf[2] = (hold >>> 16) & 0xff;
-        hbuf[3] = (hold >>> 24) & 0xff;
-        state.check = crc32(state.check, hbuf, 4, 0);
-        //===
-      }
-      //=== INITBITS();
-      hold = 0;
-      bits = 0;
-      //===//
-      state.mode = OS;
-      /* falls through */
-    case OS:
-      //=== NEEDBITS(16); */
-      while (bits < 16) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-      }
-      //===//
-      if (state.head) {
-        state.head.xflags = (hold & 0xff);
-        state.head.os = (hold >> 8);
+      /***/
+    }
+  }
+  s.insert = ((s.strstart < (MIN_MATCH - 1)) ? s.strstart : MIN_MATCH - 1);
+  if (flush === Z_FINISH) {
+    /*** FLUSH_BLOCK(s, 1); ***/
+    flush_block_only(s, true);
+    if (s.strm.avail_out === 0) {
+      return BS_FINISH_STARTED;
+    }
+    /***/
+    return BS_FINISH_DONE;
+  }
+  if (s.last_lit) {
+    /*** FLUSH_BLOCK(s, 0); ***/
+    flush_block_only(s, false);
+    if (s.strm.avail_out === 0) {
+      return BS_NEED_MORE;
+    }
+    /***/
+  }
+  return BS_BLOCK_DONE;
+}
+
+/* ===========================================================================
+ * Same as above, but achieves better compression. We use a lazy
+ * evaluation for matches: a match is finally adopted only if there is
+ * no better match at the next window position.
+ */
+function deflate_slow(s, flush) {
+  var hash_head;          /* head of hash chain */
+  var bflush;              /* set if current block must be flushed */
+
+  var max_insert;
+
+  /* Process the input block. */
+  for (;;) {
+    /* Make sure that we always have enough lookahead, except
+     * at the end of the input file. We need MAX_MATCH bytes
+     * for the next match, plus MIN_MATCH bytes to insert the
+     * string following the next match.
+     */
+    if (s.lookahead < MIN_LOOKAHEAD) {
+      fill_window(s);
+      if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
+        return BS_NEED_MORE;
       }
-      if (state.flags & 0x0200) {
-        //=== CRC2(state.check, hold);
-        hbuf[0] = hold & 0xff;
-        hbuf[1] = (hold >>> 8) & 0xff;
-        state.check = crc32(state.check, hbuf, 2, 0);
-        //===//
+      if (s.lookahead === 0) { break; } /* flush the current block */
+    }
+
+    /* Insert the string window[strstart .. strstart+2] in the
+     * dictionary, and set hash_head to the head of the hash chain:
+     */
+    hash_head = 0/*NIL*/;
+    if (s.lookahead >= MIN_MATCH) {
+      /*** INSERT_STRING(s, s.strstart, hash_head); ***/
+      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
+      hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
+      s.head[s.ins_h] = s.strstart;
+      /***/
+    }
+
+    /* Find the longest match, discarding those <= prev_length.
+     */
+    s.prev_length = s.match_length;
+    s.prev_match = s.match_start;
+    s.match_length = MIN_MATCH - 1;
+
+    if (hash_head !== 0/*NIL*/ && s.prev_length < s.max_lazy_match &&
+        s.strstart - hash_head <= (s.w_size - MIN_LOOKAHEAD)/*MAX_DIST(s)*/) {
+      /* To simplify the code, we prevent matches with the string
+       * of window index 0 (in particular we have to avoid a match
+       * of the string with itself at the start of the input file).
+       */
+      s.match_length = longest_match(s, hash_head);
+      /* longest_match() sets match_start */
+
+      if (s.match_length <= 5 &&
+         (s.strategy === Z_FILTERED || (s.match_length === MIN_MATCH && s.strstart - s.match_start > 4096/*TOO_FAR*/))) {
+
+        /* If prev_match is also MIN_MATCH, match_start is garbage
+         * but we will ignore the current match anyway.
+         */
+        s.match_length = MIN_MATCH - 1;
       }
-      //=== INITBITS();
-      hold = 0;
-      bits = 0;
-      //===//
-      state.mode = EXLEN;
-      /* falls through */
-    case EXLEN:
-      if (state.flags & 0x0400) {
-        //=== NEEDBITS(16); */
-        while (bits < 16) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-        }
-        //===//
-        state.length = hold;
-        if (state.head) {
-          state.head.extra_len = hold;
+    }
+    /* If there was a match at the previous step and the current
+     * match is not better, output the previous match:
+     */
+    if (s.prev_length >= MIN_MATCH && s.match_length <= s.prev_length) {
+      max_insert = s.strstart + s.lookahead - MIN_MATCH;
+      /* Do not insert strings in hash table beyond this. */
+
+      //check_match(s, s.strstart-1, s.prev_match, s.prev_length);
+
+      /***_tr_tally_dist(s, s.strstart - 1 - s.prev_match,
+                     s.prev_length - MIN_MATCH, bflush);***/
+      bflush = trees._tr_tally(s, s.strstart - 1 - s.prev_match, s.prev_length - MIN_MATCH);
+      /* Insert in hash table all strings up to the end of the match.
+       * strstart-1 and strstart are already inserted. If there is not
+       * enough lookahead, the last two strings are not inserted in
+       * the hash table.
+       */
+      s.lookahead -= s.prev_length - 1;
+      s.prev_length -= 2;
+      do {
+        if (++s.strstart <= max_insert) {
+          /*** INSERT_STRING(s, s.strstart, hash_head); ***/
+          s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
+          hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
+          s.head[s.ins_h] = s.strstart;
+          /***/
         }
-        if (state.flags & 0x0200) {
-          //=== CRC2(state.check, hold);
-          hbuf[0] = hold & 0xff;
-          hbuf[1] = (hold >>> 8) & 0xff;
-          state.check = crc32(state.check, hbuf, 2, 0);
-          //===//
+      } while (--s.prev_length !== 0);
+      s.match_available = 0;
+      s.match_length = MIN_MATCH - 1;
+      s.strstart++;
+
+      if (bflush) {
+        /*** FLUSH_BLOCK(s, 0); ***/
+        flush_block_only(s, false);
+        if (s.strm.avail_out === 0) {
+          return BS_NEED_MORE;
         }
-        //=== INITBITS();
-        hold = 0;
-        bits = 0;
-        //===//
+        /***/
       }
-      else if (state.head) {
-        state.head.extra = null/*Z_NULL*/;
+
+    } else if (s.match_available) {
+      /* If there was no match at the previous position, output a
+       * single literal. If there was a match but the current match
+       * is longer, truncate the previous match to a single literal.
+       */
+      //Tracevv((stderr,"%c", s->window[s->strstart-1]));
+      /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
+      bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]);
+
+      if (bflush) {
+        /*** FLUSH_BLOCK_ONLY(s, 0) ***/
+        flush_block_only(s, false);
+        /***/
       }
-      state.mode = EXTRA;
-      /* falls through */
-    case EXTRA:
-      if (state.flags & 0x0400) {
-        copy = state.length;
-        if (copy > have) { copy = have; }
-        if (copy) {
-          if (state.head) {
-            len = state.head.extra_len - state.length;
-            if (!state.head.extra) {
-              // Use untyped array for more conveniend processing later
-              state.head.extra = new Array(state.head.extra_len);
-            }
-            utils.arraySet(
-              state.head.extra,
-              input,
-              next,
-              // extra field is limited to 65536 bytes
-              // - no need for additional size check
-              copy,
-              /*len + copy > state.head.extra_max - len ? state.head.extra_max : copy,*/
-              len
-            );
-            //zmemcpy(state.head.extra + len, next,
-            //        len + copy > state.head.extra_max ?
-            //        state.head.extra_max - len : copy);
-          }
-          if (state.flags & 0x0200) {
-            state.check = crc32(state.check, input, copy, next);
-          }
-          have -= copy;
-          next += copy;
-          state.length -= copy;
-        }
-        if (state.length) { break inf_leave; }
+      s.strstart++;
+      s.lookahead--;
+      if (s.strm.avail_out === 0) {
+        return BS_NEED_MORE;
       }
-      state.length = 0;
-      state.mode = NAME;
-      /* falls through */
-    case NAME:
-      if (state.flags & 0x0800) {
-        if (have === 0) { break inf_leave; }
-        copy = 0;
-        do {
-          // TODO: 2 or 1 bytes?
-          len = input[next + copy++];
-          /* use constant limit because in js we should not preallocate memory */
-          if (state.head && len &&
-              (state.length < 65536 /*state.head.name_max*/)) {
-            state.head.name += String.fromCharCode(len);
-          }
-        } while (len && copy < have);
+    } else {
+      /* There is no previous match to compare with, wait for
+       * the next step to decide.
+       */
+      s.match_available = 1;
+      s.strstart++;
+      s.lookahead--;
+    }
+  }
+  //Assert (flush != Z_NO_FLUSH, "no flush?");
+  if (s.match_available) {
+    //Tracevv((stderr,"%c", s->window[s->strstart-1]));
+    /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
+    bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]);
 
-        if (state.flags & 0x0200) {
-          state.check = crc32(state.check, input, copy, next);
-        }
-        have -= copy;
-        next += copy;
-        if (len) { break inf_leave; }
-      }
-      else if (state.head) {
-        state.head.name = null;
+    s.match_available = 0;
+  }
+  s.insert = s.strstart < MIN_MATCH - 1 ? s.strstart : MIN_MATCH - 1;
+  if (flush === Z_FINISH) {
+    /*** FLUSH_BLOCK(s, 1); ***/
+    flush_block_only(s, true);
+    if (s.strm.avail_out === 0) {
+      return BS_FINISH_STARTED;
+    }
+    /***/
+    return BS_FINISH_DONE;
+  }
+  if (s.last_lit) {
+    /*** FLUSH_BLOCK(s, 0); ***/
+    flush_block_only(s, false);
+    if (s.strm.avail_out === 0) {
+      return BS_NEED_MORE;
+    }
+    /***/
+  }
+
+  return BS_BLOCK_DONE;
+}
+
+
+/* ===========================================================================
+ * For Z_RLE, simply look for runs of bytes, generate matches only of distance
+ * one.  Do not maintain a hash table.  (It will be regenerated if this run of
+ * deflate switches away from Z_RLE.)
+ */
+function deflate_rle(s, flush) {
+  var bflush;            /* set if current block must be flushed */
+  var prev;              /* byte at distance one to match */
+  var scan, strend;      /* scan goes up to strend for length of run */
+
+  var _win = s.window;
+
+  for (;;) {
+    /* Make sure that we always have enough lookahead, except
+     * at the end of the input file. We need MAX_MATCH bytes
+     * for the longest run, plus one for the unrolled loop.
+     */
+    if (s.lookahead <= MAX_MATCH) {
+      fill_window(s);
+      if (s.lookahead <= MAX_MATCH && flush === Z_NO_FLUSH) {
+        return BS_NEED_MORE;
       }
-      state.length = 0;
-      state.mode = COMMENT;
-      /* falls through */
-    case COMMENT:
-      if (state.flags & 0x1000) {
-        if (have === 0) { break inf_leave; }
-        copy = 0;
+      if (s.lookahead === 0) { break; } /* flush the current block */
+    }
+
+    /* See how many times the previous byte repeats */
+    s.match_length = 0;
+    if (s.lookahead >= MIN_MATCH && s.strstart > 0) {
+      scan = s.strstart - 1;
+      prev = _win[scan];
+      if (prev === _win[++scan] && prev === _win[++scan] && prev === _win[++scan]) {
+        strend = s.strstart + MAX_MATCH;
         do {
-          len = input[next + copy++];
-          /* use constant limit because in js we should not preallocate memory */
-          if (state.head && len &&
-              (state.length < 65536 /*state.head.comm_max*/)) {
-            state.head.comment += String.fromCharCode(len);
-          }
-        } while (len && copy < have);
-        if (state.flags & 0x0200) {
-          state.check = crc32(state.check, input, copy, next);
-        }
-        have -= copy;
-        next += copy;
-        if (len) { break inf_leave; }
-      }
-      else if (state.head) {
-        state.head.comment = null;
-      }
-      state.mode = HCRC;
-      /* falls through */
-    case HCRC:
-      if (state.flags & 0x0200) {
-        //=== NEEDBITS(16); */
-        while (bits < 16) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-        }
-        //===//
-        if (hold !== (state.check & 0xffff)) {
-          strm.msg = 'header crc mismatch';
-          state.mode = BAD;
-          break;
+          /*jshint noempty:false*/
+        } while (prev === _win[++scan] && prev === _win[++scan] &&
+                 prev === _win[++scan] && prev === _win[++scan] &&
+                 prev === _win[++scan] && prev === _win[++scan] &&
+                 prev === _win[++scan] && prev === _win[++scan] &&
+                 scan < strend);
+        s.match_length = MAX_MATCH - (strend - scan);
+        if (s.match_length > s.lookahead) {
+          s.match_length = s.lookahead;
         }
-        //=== INITBITS();
-        hold = 0;
-        bits = 0;
-        //===//
       }
-      if (state.head) {
-        state.head.hcrc = ((state.flags >> 9) & 1);
-        state.head.done = true;
-      }
-      strm.adler = state.check = 0;
-      state.mode = TYPE;
-      break;
-    case DICTID:
-      //=== NEEDBITS(32); */
-      while (bits < 32) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
+      //Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
+    }
+
+    /* Emit match if have run of MIN_MATCH or longer, else emit literal */
+    if (s.match_length >= MIN_MATCH) {
+      //check_match(s, s.strstart, s.strstart - 1, s.match_length);
+
+      /*** _tr_tally_dist(s, 1, s.match_length - MIN_MATCH, bflush); ***/
+      bflush = trees._tr_tally(s, 1, s.match_length - MIN_MATCH);
+
+      s.lookahead -= s.match_length;
+      s.strstart += s.match_length;
+      s.match_length = 0;
+    } else {
+      /* No match, output a literal byte */
+      //Tracevv((stderr,"%c", s->window[s->strstart]));
+      /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
+      bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
+
+      s.lookahead--;
+      s.strstart++;
+    }
+    if (bflush) {
+      /*** FLUSH_BLOCK(s, 0); ***/
+      flush_block_only(s, false);
+      if (s.strm.avail_out === 0) {
+        return BS_NEED_MORE;
       }
-      //===//
-      strm.adler = state.check = zswap32(hold);
-      //=== INITBITS();
-      hold = 0;
-      bits = 0;
-      //===//
-      state.mode = DICT;
-      /* falls through */
-    case DICT:
-      if (state.havedict === 0) {
-        //--- RESTORE() ---
-        strm.next_out = put;
-        strm.avail_out = left;
-        strm.next_in = next;
-        strm.avail_in = have;
-        state.hold = hold;
-        state.bits = bits;
-        //---
-        return Z_NEED_DICT;
-      }
-      strm.adler = state.check = 1/*adler32(0L, Z_NULL, 0)*/;
-      state.mode = TYPE;
-      /* falls through */
-    case TYPE:
-      if (flush === Z_BLOCK || flush === Z_TREES) { break inf_leave; }
-      /* falls through */
-    case TYPEDO:
-      if (state.last) {
-        //--- BYTEBITS() ---//
-        hold >>>= bits & 7;
-        bits -= bits & 7;
-        //---//
-        state.mode = CHECK;
-        break;
-      }
-      //=== NEEDBITS(3); */
-      while (bits < 3) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-      }
-      //===//
-      state.last = (hold & 0x01)/*BITS(1)*/;
-      //--- DROPBITS(1) ---//
-      hold >>>= 1;
-      bits -= 1;
-      //---//
+      /***/
+    }
+  }
+  s.insert = 0;
+  if (flush === Z_FINISH) {
+    /*** FLUSH_BLOCK(s, 1); ***/
+    flush_block_only(s, true);
+    if (s.strm.avail_out === 0) {
+      return BS_FINISH_STARTED;
+    }
+    /***/
+    return BS_FINISH_DONE;
+  }
+  if (s.last_lit) {
+    /*** FLUSH_BLOCK(s, 0); ***/
+    flush_block_only(s, false);
+    if (s.strm.avail_out === 0) {
+      return BS_NEED_MORE;
+    }
+    /***/
+  }
+  return BS_BLOCK_DONE;
+}
 
-      switch ((hold & 0x03)/*BITS(2)*/) {
-      case 0:                             /* stored block */
-        //Tracev((stderr, "inflate:     stored block%s\n",
-        //        state.last ? " (last)" : ""));
-        state.mode = STORED;
-        break;
-      case 1:                             /* fixed block */
-        fixedtables(state);
-        //Tracev((stderr, "inflate:     fixed codes block%s\n",
-        //        state.last ? " (last)" : ""));
-        state.mode = LEN_;             /* decode codes */
-        if (flush === Z_TREES) {
-          //--- DROPBITS(2) ---//
-          hold >>>= 2;
-          bits -= 2;
-          //---//
-          break inf_leave;
-        }
-        break;
-      case 2:                             /* dynamic block */
-        //Tracev((stderr, "inflate:     dynamic codes block%s\n",
-        //        state.last ? " (last)" : ""));
-        state.mode = TABLE;
-        break;
-      case 3:
-        strm.msg = 'invalid block type';
-        state.mode = BAD;
-      }
-      //--- DROPBITS(2) ---//
-      hold >>>= 2;
-      bits -= 2;
-      //---//
-      break;
-    case STORED:
-      //--- BYTEBITS() ---// /* go to byte boundary */
-      hold >>>= bits & 7;
-      bits -= bits & 7;
-      //---//
-      //=== NEEDBITS(32); */
-      while (bits < 32) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-      }
-      //===//
-      if ((hold & 0xffff) !== ((hold >>> 16) ^ 0xffff)) {
-        strm.msg = 'invalid stored block lengths';
-        state.mode = BAD;
-        break;
-      }
-      state.length = hold & 0xffff;
-      //Tracev((stderr, "inflate:       stored length %u\n",
-      //        state.length));
-      //=== INITBITS();
-      hold = 0;
-      bits = 0;
-      //===//
-      state.mode = COPY_;
-      if (flush === Z_TREES) { break inf_leave; }
-      /* falls through */
-    case COPY_:
-      state.mode = COPY;
-      /* falls through */
-    case COPY:
-      copy = state.length;
-      if (copy) {
-        if (copy > have) { copy = have; }
-        if (copy > left) { copy = left; }
-        if (copy === 0) { break inf_leave; }
-        //--- zmemcpy(put, next, copy); ---
-        utils.arraySet(output, input, next, copy, put);
-        //---//
-        have -= copy;
-        next += copy;
-        left -= copy;
-        put += copy;
-        state.length -= copy;
-        break;
-      }
-      //Tracev((stderr, "inflate:       stored end\n"));
-      state.mode = TYPE;
-      break;
-    case TABLE:
-      //=== NEEDBITS(14); */
-      while (bits < 14) {
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-      }
-      //===//
-      state.nlen = (hold & 0x1f)/*BITS(5)*/ + 257;
-      //--- DROPBITS(5) ---//
-      hold >>>= 5;
-      bits -= 5;
-      //---//
-      state.ndist = (hold & 0x1f)/*BITS(5)*/ + 1;
-      //--- DROPBITS(5) ---//
-      hold >>>= 5;
-      bits -= 5;
-      //---//
-      state.ncode = (hold & 0x0f)/*BITS(4)*/ + 4;
-      //--- DROPBITS(4) ---//
-      hold >>>= 4;
-      bits -= 4;
-      //---//
-//#ifndef PKZIP_BUG_WORKAROUND
-      if (state.nlen > 286 || state.ndist > 30) {
-        strm.msg = 'too many length or distance symbols';
-        state.mode = BAD;
-        break;
-      }
-//#endif
-      //Tracev((stderr, "inflate:       table sizes ok\n"));
-      state.have = 0;
-      state.mode = LENLENS;
-      /* falls through */
-    case LENLENS:
-      while (state.have < state.ncode) {
-        //=== NEEDBITS(3);
-        while (bits < 3) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
+/* ===========================================================================
+ * For Z_HUFFMAN_ONLY, do not look for matches.  Do not maintain a hash table.
+ * (It will be regenerated if this run of deflate switches away from Huffman.)
+ */
+function deflate_huff(s, flush) {
+  var bflush;             /* set if current block must be flushed */
+
+  for (;;) {
+    /* Make sure that we have a literal to write. */
+    if (s.lookahead === 0) {
+      fill_window(s);
+      if (s.lookahead === 0) {
+        if (flush === Z_NO_FLUSH) {
+          return BS_NEED_MORE;
         }
-        //===//
-        state.lens[order[state.have++]] = (hold & 0x07);//BITS(3);
-        //--- DROPBITS(3) ---//
-        hold >>>= 3;
-        bits -= 3;
-        //---//
-      }
-      while (state.have < 19) {
-        state.lens[order[state.have++]] = 0;
+        break;      /* flush the current block */
       }
-      // We have separate tables & no pointers. 2 commented lines below not needed.
-      //state.next = state.codes;
-      //state.lencode = state.next;
-      // Switch to use dynamic table
-      state.lencode = state.lendyn;
-      state.lenbits = 7;
-
-      opts = { bits: state.lenbits };
-      ret = inflate_table(CODES, state.lens, 0, 19, state.lencode, 0, state.work, opts);
-      state.lenbits = opts.bits;
+    }
 
-      if (ret) {
-        strm.msg = 'invalid code lengths set';
-        state.mode = BAD;
-        break;
+    /* Output a literal byte */
+    s.match_length = 0;
+    //Tracevv((stderr,"%c", s->window[s->strstart]));
+    /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
+    bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
+    s.lookahead--;
+    s.strstart++;
+    if (bflush) {
+      /*** FLUSH_BLOCK(s, 0); ***/
+      flush_block_only(s, false);
+      if (s.strm.avail_out === 0) {
+        return BS_NEED_MORE;
       }
-      //Tracev((stderr, "inflate:       code lengths ok\n"));
-      state.have = 0;
-      state.mode = CODELENS;
-      /* falls through */
-    case CODELENS:
-      while (state.have < state.nlen + state.ndist) {
-        for (;;) {
-          here = state.lencode[hold & ((1 << state.lenbits) - 1)];/*BITS(state.lenbits)*/
-          here_bits = here >>> 24;
-          here_op = (here >>> 16) & 0xff;
-          here_val = here & 0xffff;
+      /***/
+    }
+  }
+  s.insert = 0;
+  if (flush === Z_FINISH) {
+    /*** FLUSH_BLOCK(s, 1); ***/
+    flush_block_only(s, true);
+    if (s.strm.avail_out === 0) {
+      return BS_FINISH_STARTED;
+    }
+    /***/
+    return BS_FINISH_DONE;
+  }
+  if (s.last_lit) {
+    /*** FLUSH_BLOCK(s, 0); ***/
+    flush_block_only(s, false);
+    if (s.strm.avail_out === 0) {
+      return BS_NEED_MORE;
+    }
+    /***/
+  }
+  return BS_BLOCK_DONE;
+}
 
-          if ((here_bits) <= bits) { break; }
-          //--- PULLBYTE() ---//
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-          //---//
-        }
-        if (here_val < 16) {
-          //--- DROPBITS(here.bits) ---//
-          hold >>>= here_bits;
-          bits -= here_bits;
-          //---//
-          state.lens[state.have++] = here_val;
-        }
-        else {
-          if (here_val === 16) {
-            //=== NEEDBITS(here.bits + 2);
-            n = here_bits + 2;
-            while (bits < n) {
-              if (have === 0) { break inf_leave; }
-              have--;
-              hold += input[next++] << bits;
-              bits += 8;
-            }
-            //===//
-            //--- DROPBITS(here.bits) ---//
-            hold >>>= here_bits;
-            bits -= here_bits;
-            //---//
-            if (state.have === 0) {
-              strm.msg = 'invalid bit length repeat';
-              state.mode = BAD;
-              break;
-            }
-            len = state.lens[state.have - 1];
-            copy = 3 + (hold & 0x03);//BITS(2);
-            //--- DROPBITS(2) ---//
-            hold >>>= 2;
-            bits -= 2;
-            //---//
-          }
-          else if (here_val === 17) {
-            //=== NEEDBITS(here.bits + 3);
-            n = here_bits + 3;
-            while (bits < n) {
-              if (have === 0) { break inf_leave; }
-              have--;
-              hold += input[next++] << bits;
-              bits += 8;
-            }
-            //===//
-            //--- DROPBITS(here.bits) ---//
-            hold >>>= here_bits;
-            bits -= here_bits;
-            //---//
-            len = 0;
-            copy = 3 + (hold & 0x07);//BITS(3);
-            //--- DROPBITS(3) ---//
-            hold >>>= 3;
-            bits -= 3;
-            //---//
-          }
-          else {
-            //=== NEEDBITS(here.bits + 7);
-            n = here_bits + 7;
-            while (bits < n) {
-              if (have === 0) { break inf_leave; }
-              have--;
-              hold += input[next++] << bits;
-              bits += 8;
-            }
-            //===//
-            //--- DROPBITS(here.bits) ---//
-            hold >>>= here_bits;
-            bits -= here_bits;
-            //---//
-            len = 0;
-            copy = 11 + (hold & 0x7f);//BITS(7);
-            //--- DROPBITS(7) ---//
-            hold >>>= 7;
-            bits -= 7;
-            //---//
-          }
-          if (state.have + copy > state.nlen + state.ndist) {
-            strm.msg = 'invalid bit length repeat';
-            state.mode = BAD;
-            break;
-          }
-          while (copy--) {
-            state.lens[state.have++] = len;
-          }
-        }
-      }
+/* Values for max_lazy_match, good_match and max_chain_length, depending on
+ * the desired pack level (0..9). The values given below have been tuned to
+ * exclude worst case performance for pathological files. Better values may be
+ * found for specific files.
+ */
+function Config(good_length, max_lazy, nice_length, max_chain, func) {
+  this.good_length = good_length;
+  this.max_lazy = max_lazy;
+  this.nice_length = nice_length;
+  this.max_chain = max_chain;
+  this.func = func;
+}
 
-      /* handle error breaks in while */
-      if (state.mode === BAD) { break; }
+var configuration_table;
 
-      /* check for end-of-block code (better have one) */
-      if (state.lens[256] === 0) {
-        strm.msg = 'invalid code -- missing end-of-block';
-        state.mode = BAD;
-        break;
-      }
+configuration_table = [
+  /*      good lazy nice chain */
+  new Config(0, 0, 0, 0, deflate_stored),          /* 0 store only */
+  new Config(4, 4, 8, 4, deflate_fast),            /* 1 max speed, no lazy matches */
+  new Config(4, 5, 16, 8, deflate_fast),           /* 2 */
+  new Config(4, 6, 32, 32, deflate_fast),          /* 3 */
 
-      /* build code tables -- note: do not change the lenbits or distbits
-         values here (9 and 6) without reading the comments in inftrees.h
-         concerning the ENOUGH constants, which depend on those values */
-      state.lenbits = 9;
+  new Config(4, 4, 16, 16, deflate_slow),          /* 4 lazy matches */
+  new Config(8, 16, 32, 32, deflate_slow),         /* 5 */
+  new Config(8, 16, 128, 128, deflate_slow),       /* 6 */
+  new Config(8, 32, 128, 256, deflate_slow),       /* 7 */
+  new Config(32, 128, 258, 1024, deflate_slow),    /* 8 */
+  new Config(32, 258, 258, 4096, deflate_slow)     /* 9 max compression */
+];
 
-      opts = { bits: state.lenbits };
-      ret = inflate_table(LENS, state.lens, 0, state.nlen, state.lencode, 0, state.work, opts);
-      // We have separate tables & no pointers. 2 commented lines below not needed.
-      // state.next_index = opts.table_index;
-      state.lenbits = opts.bits;
-      // state.lencode = state.next;
 
-      if (ret) {
-        strm.msg = 'invalid literal/lengths set';
-        state.mode = BAD;
-        break;
-      }
+/* ===========================================================================
+ * Initialize the "longest match" routines for a new zlib stream
+ */
+function lm_init(s) {
+  s.window_size = 2 * s.w_size;
 
-      state.distbits = 6;
-      //state.distcode.copy(state.codes);
-      // Switch to use dynamic table
-      state.distcode = state.distdyn;
-      opts = { bits: state.distbits };
-      ret = inflate_table(DISTS, state.lens, state.nlen, state.ndist, state.distcode, 0, state.work, opts);
-      // We have separate tables & no pointers. 2 commented lines below not needed.
-      // state.next_index = opts.table_index;
-      state.distbits = opts.bits;
-      // state.distcode = state.next;
+  /*** CLEAR_HASH(s); ***/
+  zero(s.head); // Fill with NIL (= 0);
 
-      if (ret) {
-        strm.msg = 'invalid distances set';
-        state.mode = BAD;
-        break;
-      }
-      //Tracev((stderr, 'inflate:       codes ok\n'));
-      state.mode = LEN_;
-      if (flush === Z_TREES) { break inf_leave; }
-      /* falls through */
-    case LEN_:
-      state.mode = LEN;
-      /* falls through */
-    case LEN:
-      if (have >= 6 && left >= 258) {
-        //--- RESTORE() ---
-        strm.next_out = put;
-        strm.avail_out = left;
-        strm.next_in = next;
-        strm.avail_in = have;
-        state.hold = hold;
-        state.bits = bits;
-        //---
-        inflate_fast(strm, _out);
-        //--- LOAD() ---
-        put = strm.next_out;
-        output = strm.output;
-        left = strm.avail_out;
-        next = strm.next_in;
-        input = strm.input;
-        have = strm.avail_in;
-        hold = state.hold;
-        bits = state.bits;
-        //---
+  /* Set the default configuration parameters:
+   */
+  s.max_lazy_match = configuration_table[s.level].max_lazy;
+  s.good_match = configuration_table[s.level].good_length;
+  s.nice_match = configuration_table[s.level].nice_length;
+  s.max_chain_length = configuration_table[s.level].max_chain;
 
-        if (state.mode === TYPE) {
-          state.back = -1;
-        }
-        break;
-      }
-      state.back = 0;
-      for (;;) {
-        here = state.lencode[hold & ((1 << state.lenbits) - 1)];  /*BITS(state.lenbits)*/
-        here_bits = here >>> 24;
-        here_op = (here >>> 16) & 0xff;
-        here_val = here & 0xffff;
+  s.strstart = 0;
+  s.block_start = 0;
+  s.lookahead = 0;
+  s.insert = 0;
+  s.match_length = s.prev_length = MIN_MATCH - 1;
+  s.match_available = 0;
+  s.ins_h = 0;
+}
 
-        if (here_bits <= bits) { break; }
-        //--- PULLBYTE() ---//
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-        //---//
-      }
-      if (here_op && (here_op & 0xf0) === 0) {
-        last_bits = here_bits;
-        last_op = here_op;
-        last_val = here_val;
-        for (;;) {
-          here = state.lencode[last_val +
-                  ((hold & ((1 << (last_bits + last_op)) - 1))/*BITS(last.bits + last.op)*/ >> last_bits)];
-          here_bits = here >>> 24;
-          here_op = (here >>> 16) & 0xff;
-          here_val = here & 0xffff;
 
-          if ((last_bits + here_bits) <= bits) { break; }
-          //--- PULLBYTE() ---//
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-          //---//
-        }
-        //--- DROPBITS(last.bits) ---//
-        hold >>>= last_bits;
-        bits -= last_bits;
-        //---//
-        state.back += last_bits;
-      }
-      //--- DROPBITS(here.bits) ---//
-      hold >>>= here_bits;
-      bits -= here_bits;
-      //---//
-      state.back += here_bits;
-      state.length = here_val;
-      if (here_op === 0) {
-        //Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
-        //        "inflate:         literal '%c'\n" :
-        //        "inflate:         literal 0x%02x\n", here.val));
-        state.mode = LIT;
-        break;
-      }
-      if (here_op & 32) {
-        //Tracevv((stderr, "inflate:         end of block\n"));
-        state.back = -1;
-        state.mode = TYPE;
-        break;
-      }
-      if (here_op & 64) {
-        strm.msg = 'invalid literal/length code';
-        state.mode = BAD;
-        break;
-      }
-      state.extra = here_op & 15;
-      state.mode = LENEXT;
-      /* falls through */
-    case LENEXT:
-      if (state.extra) {
-        //=== NEEDBITS(state.extra);
-        n = state.extra;
-        while (bits < n) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-        }
-        //===//
-        state.length += hold & ((1 << state.extra) - 1)/*BITS(state.extra)*/;
-        //--- DROPBITS(state.extra) ---//
-        hold >>>= state.extra;
-        bits -= state.extra;
-        //---//
-        state.back += state.extra;
-      }
-      //Tracevv((stderr, "inflate:         length %u\n", state.length));
-      state.was = state.length;
-      state.mode = DIST;
-      /* falls through */
-    case DIST:
-      for (;;) {
-        here = state.distcode[hold & ((1 << state.distbits) - 1)];/*BITS(state.distbits)*/
-        here_bits = here >>> 24;
-        here_op = (here >>> 16) & 0xff;
-        here_val = here & 0xffff;
-
-        if ((here_bits) <= bits) { break; }
-        //--- PULLBYTE() ---//
-        if (have === 0) { break inf_leave; }
-        have--;
-        hold += input[next++] << bits;
-        bits += 8;
-        //---//
-      }
-      if ((here_op & 0xf0) === 0) {
-        last_bits = here_bits;
-        last_op = here_op;
-        last_val = here_val;
-        for (;;) {
-          here = state.distcode[last_val +
-                  ((hold & ((1 << (last_bits + last_op)) - 1))/*BITS(last.bits + last.op)*/ >> last_bits)];
-          here_bits = here >>> 24;
-          here_op = (here >>> 16) & 0xff;
-          here_val = here & 0xffff;
-
-          if ((last_bits + here_bits) <= bits) { break; }
-          //--- PULLBYTE() ---//
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-          //---//
-        }
-        //--- DROPBITS(last.bits) ---//
-        hold >>>= last_bits;
-        bits -= last_bits;
-        //---//
-        state.back += last_bits;
-      }
-      //--- DROPBITS(here.bits) ---//
-      hold >>>= here_bits;
-      bits -= here_bits;
-      //---//
-      state.back += here_bits;
-      if (here_op & 64) {
-        strm.msg = 'invalid distance code';
-        state.mode = BAD;
-        break;
-      }
-      state.offset = here_val;
-      state.extra = (here_op) & 15;
-      state.mode = DISTEXT;
-      /* falls through */
-    case DISTEXT:
-      if (state.extra) {
-        //=== NEEDBITS(state.extra);
-        n = state.extra;
-        while (bits < n) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-        }
-        //===//
-        state.offset += hold & ((1 << state.extra) - 1)/*BITS(state.extra)*/;
-        //--- DROPBITS(state.extra) ---//
-        hold >>>= state.extra;
-        bits -= state.extra;
-        //---//
-        state.back += state.extra;
-      }
-//#ifdef INFLATE_STRICT
-      if (state.offset > state.dmax) {
-        strm.msg = 'invalid distance too far back';
-        state.mode = BAD;
-        break;
-      }
-//#endif
-      //Tracevv((stderr, "inflate:         distance %u\n", state.offset));
-      state.mode = MATCH;
-      /* falls through */
-    case MATCH:
-      if (left === 0) { break inf_leave; }
-      copy = _out - left;
-      if (state.offset > copy) {         /* copy from window */
-        copy = state.offset - copy;
-        if (copy > state.whave) {
-          if (state.sane) {
-            strm.msg = 'invalid distance too far back';
-            state.mode = BAD;
-            break;
-          }
-// (!) This block is disabled in zlib defailts,
-// don't enable it for binary compatibility
-//#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-//          Trace((stderr, "inflate.c too far\n"));
-//          copy -= state.whave;
-//          if (copy > state.length) { copy = state.length; }
-//          if (copy > left) { copy = left; }
-//          left -= copy;
-//          state.length -= copy;
-//          do {
-//            output[put++] = 0;
-//          } while (--copy);
-//          if (state.length === 0) { state.mode = LEN; }
-//          break;
-//#endif
-        }
-        if (copy > state.wnext) {
-          copy -= state.wnext;
-          from = state.wsize - copy;
-        }
-        else {
-          from = state.wnext - copy;
-        }
-        if (copy > state.length) { copy = state.length; }
-        from_source = state.window;
-      }
-      else {                              /* copy from output */
-        from_source = output;
-        from = put - state.offset;
-        copy = state.length;
-      }
-      if (copy > left) { copy = left; }
-      left -= copy;
-      state.length -= copy;
-      do {
-        output[put++] = from_source[from++];
-      } while (--copy);
-      if (state.length === 0) { state.mode = LEN; }
-      break;
-    case LIT:
-      if (left === 0) { break inf_leave; }
-      output[put++] = state.length;
-      left--;
-      state.mode = LEN;
-      break;
-    case CHECK:
-      if (state.wrap) {
-        //=== NEEDBITS(32);
-        while (bits < 32) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          // Use '|' insdead of '+' to make sure that result is signed
-          hold |= input[next++] << bits;
-          bits += 8;
-        }
-        //===//
-        _out -= left;
-        strm.total_out += _out;
-        state.total += _out;
-        if (_out) {
-          strm.adler = state.check =
-              /*UPDATE(state.check, put - _out, _out);*/
-              (state.flags ? crc32(state.check, output, _out, put - _out) : adler32(state.check, output, _out, put - _out));
-
-        }
-        _out = left;
-        // NB: crc32 stored as signed 32-bit int, zswap32 returns signed too
-        if ((state.flags ? hold : zswap32(hold)) !== state.check) {
-          strm.msg = 'incorrect data check';
-          state.mode = BAD;
-          break;
-        }
-        //=== INITBITS();
-        hold = 0;
-        bits = 0;
-        //===//
-        //Tracev((stderr, "inflate:   check matches trailer\n"));
-      }
-      state.mode = LENGTH;
-      /* falls through */
-    case LENGTH:
-      if (state.wrap && state.flags) {
-        //=== NEEDBITS(32);
-        while (bits < 32) {
-          if (have === 0) { break inf_leave; }
-          have--;
-          hold += input[next++] << bits;
-          bits += 8;
-        }
-        //===//
-        if (hold !== (state.total & 0xffffffff)) {
-          strm.msg = 'incorrect length check';
-          state.mode = BAD;
-          break;
-        }
-        //=== INITBITS();
-        hold = 0;
-        bits = 0;
-        //===//
-        //Tracev((stderr, "inflate:   length matches trailer\n"));
-      }
-      state.mode = DONE;
-      /* falls through */
-    case DONE:
-      ret = Z_STREAM_END;
-      break inf_leave;
-    case BAD:
-      ret = Z_DATA_ERROR;
-      break inf_leave;
-    case MEM:
-      return Z_MEM_ERROR;
-    case SYNC:
-      /* falls through */
-    default:
-      return Z_STREAM_ERROR;
-    }
-  }
+function DeflateState() {
+  this.strm = null;            /* pointer back to this zlib stream */
+  this.status = 0;            /* as the name implies */
+  this.pending_buf = null;      /* output still pending */
+  this.pending_buf_size = 0;  /* size of pending_buf */
+  this.pending_out = 0;       /* next pending byte to output to the stream */
+  this.pending = 0;           /* nb of bytes in the pending buffer */
+  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */
+  this.gzhead = null;         /* gzip header information to write */
+  this.gzindex = 0;           /* where in extra, name, or comment */
+  this.method = Z_DEFLATED; /* can only be DEFLATED */
+  this.last_flush = -1;   /* value of flush param for previous deflate call */
 
-  // inf_leave <- here is real place for "goto inf_leave", emulated via "break inf_leave"
+  this.w_size = 0;  /* LZ77 window size (32K by default) */
+  this.w_bits = 0;  /* log2(w_size)  (8..16) */
+  this.w_mask = 0;  /* w_size - 1 */
 
-  /*
-     Return from inflate(), updating the total counts and the check value.
-     If there was no progress during the inflate() call, return a buffer
-     error.  Call updatewindow() to create and/or update the window state.
-     Note: a memory error from inflate() is non-recoverable.
+  this.window = null;
+  /* Sliding window. Input bytes are read into the second half of the window,
+   * and move to the first half later to keep a dictionary of at least wSize
+   * bytes. With this organization, matches are limited to a distance of
+   * wSize-MAX_MATCH bytes, but this ensures that IO is always
+   * performed with a length multiple of the block size.
    */
 
-  //--- RESTORE() ---
-  strm.next_out = put;
-  strm.avail_out = left;
-  strm.next_in = next;
-  strm.avail_in = have;
-  state.hold = hold;
-  state.bits = bits;
-  //---
+  this.window_size = 0;
+  /* Actual size of window: 2*wSize, except when the user input buffer
+   * is directly used as sliding window.
+   */
 
-  if (state.wsize || (_out !== strm.avail_out && state.mode < BAD &&
-                      (state.mode < CHECK || flush !== Z_FINISH))) {
-    if (updatewindow(strm, strm.output, strm.next_out, _out - strm.avail_out)) {
-      state.mode = MEM;
-      return Z_MEM_ERROR;
-    }
-  }
-  _in -= strm.avail_in;
-  _out -= strm.avail_out;
-  strm.total_in += _in;
-  strm.total_out += _out;
-  state.total += _out;
-  if (state.wrap && _out) {
-    strm.adler = state.check = /*UPDATE(state.check, strm.next_out - _out, _out);*/
-      (state.flags ? crc32(state.check, output, _out, strm.next_out - _out) : adler32(state.check, output, _out, strm.next_out - _out));
-  }
-  strm.data_type = state.bits + (state.last ? 64 : 0) +
-                    (state.mode === TYPE ? 128 : 0) +
-                    (state.mode === LEN_ || state.mode === COPY_ ? 256 : 0);
-  if (((_in === 0 && _out === 0) || flush === Z_FINISH) && ret === Z_OK) {
-    ret = Z_BUF_ERROR;
-  }
-  return ret;
-}
+  this.prev = null;
+  /* Link to older string with same hash index. To limit the size of this
+   * array to 64K, this link is maintained only for the last 32K strings.
+   * An index in this array is thus a window index modulo 32K.
+   */
 
-function inflateEnd(strm) {
+  this.head = null;   /* Heads of the hash chains or NIL. */
 
-  if (!strm || !strm.state /*|| strm->zfree == (free_func)0*/) {
-    return Z_STREAM_ERROR;
-  }
+  this.ins_h = 0;       /* hash index of string to be inserted */
+  this.hash_size = 0;   /* number of elements in hash table */
+  this.hash_bits = 0;   /* log2(hash_size) */
+  this.hash_mask = 0;   /* hash_size-1 */
 
-  var state = strm.state;
-  if (state.window) {
-    state.window = null;
-  }
-  strm.state = null;
-  return Z_OK;
-}
+  this.hash_shift = 0;
+  /* Number of bits by which ins_h must be shifted at each input
+   * step. It must be such that after MIN_MATCH steps, the oldest
+   * byte no longer takes part in the hash key, that is:
+   *   hash_shift * MIN_MATCH >= hash_bits
+   */
 
-function inflateGetHeader(strm, head) {
-  var state;
+  this.block_start = 0;
+  /* Window position at the beginning of the current output block. Gets
+   * negative when the window is moved backwards.
+   */
 
-  /* check state */
-  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
-  state = strm.state;
-  if ((state.wrap & 2) === 0) { return Z_STREAM_ERROR; }
+  this.match_length = 0;      /* length of best match */
+  this.prev_match = 0;        /* previous match */
+  this.match_available = 0;   /* set if previous match exists */
+  this.strstart = 0;          /* start of string to insert */
+  this.match_start = 0;       /* start of matching string */
+  this.lookahead = 0;         /* number of valid bytes ahead in window */
 
-  /* save header structure */
-  state.head = head;
-  head.done = false;
-  return Z_OK;
-}
+  this.prev_length = 0;
+  /* Length of the best match at previous step. Matches not greater than this
+   * are discarded. This is used in the lazy match evaluation.
+   */
 
-function inflateSetDictionary(strm, dictionary) {
-  var dictLength = dictionary.length;
+  this.max_chain_length = 0;
+  /* To speed up deflation, hash chains are never searched beyond this
+   * length.  A higher limit improves compression ratio but degrades the
+   * speed.
+   */
 
-  var state;
-  var dictid;
-  var ret;
+  this.max_lazy_match = 0;
+  /* Attempt to find a better match only when the current match is strictly
+   * smaller than this value. This mechanism is used only for compression
+   * levels >= 4.
+   */
+  // That's alias to max_lazy_match, don't use directly
+  //this.max_insert_length = 0;
+  /* Insert new strings in the hash table only if the match length is not
+   * greater than this length. This saves time but degrades compression.
+   * max_insert_length is used only for compression levels <= 3.
+   */
 
-  /* check state */
-  if (!strm /* == Z_NULL */ || !strm.state /* == Z_NULL */) { return Z_STREAM_ERROR; }
-  state = strm.state;
+  this.level = 0;     /* compression level (1..9) */
+  this.strategy = 0;  /* favor or force Huffman coding*/
 
-  if (state.wrap !== 0 && state.mode !== DICT) {
-    return Z_STREAM_ERROR;
-  }
+  this.good_match = 0;
+  /* Use a faster search when the previous match is longer than this */
 
-  /* check for correct dictionary identifier */
-  if (state.mode === DICT) {
-    dictid = 1; /* adler32(0, null, 0)*/
-    /* dictid = adler32(dictid, dictionary, dictLength); */
-    dictid = adler32(dictid, dictionary, dictLength, 0);
-    if (dictid !== state.check) {
-      return Z_DATA_ERROR;
-    }
-  }
-  /* copy dictionary to window using updatewindow(), which will amend the
-   existing dictionary if appropriate */
-  ret = updatewindow(strm, dictionary, dictLength, dictLength);
-  if (ret) {
-    state.mode = MEM;
-    return Z_MEM_ERROR;
-  }
-  state.havedict = 1;
-  // Tracev((stderr, "inflate:   dictionary set\n"));
-  return Z_OK;
-}
+  this.nice_match = 0; /* Stop searching when current match exceeds this */
 
-exports.inflateReset = inflateReset;
-exports.inflateReset2 = inflateReset2;
-exports.inflateResetKeep = inflateResetKeep;
-exports.inflateInit = inflateInit;
-exports.inflateInit2 = inflateInit2;
-exports.inflate = inflate;
-exports.inflateEnd = inflateEnd;
-exports.inflateGetHeader = inflateGetHeader;
-exports.inflateSetDictionary = inflateSetDictionary;
-exports.inflateInfo = 'pako inflate (from Nodeca project)';
+              /* used by trees.c: */
 
-/* Not implemented
-exports.inflateCopy = inflateCopy;
-exports.inflateGetDictionary = inflateGetDictionary;
-exports.inflateMark = inflateMark;
-exports.inflatePrime = inflatePrime;
-exports.inflateSync = inflateSync;
-exports.inflateSyncPoint = inflateSyncPoint;
-exports.inflateUndermine = inflateUndermine;
-*/
+  /* Didn't use ct_data typedef below to suppress compiler warning */
 
-},{"../utils/common":163,"./adler32":165,"./crc32":167,"./inffast":170,"./inftrees":172}],172:[function(_dereq_,module,exports){
-'use strict';
+  // struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
+  // struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
+  // struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */
 
+  // Use flat array of DOUBLE size, with interleaved fata,
+  // because JS does not support effective
+  this.dyn_ltree  = new utils.Buf16(HEAP_SIZE * 2);
+  this.dyn_dtree  = new utils.Buf16((2 * D_CODES + 1) * 2);
+  this.bl_tree    = new utils.Buf16((2 * BL_CODES + 1) * 2);
+  zero(this.dyn_ltree);
+  zero(this.dyn_dtree);
+  zero(this.bl_tree);
 
-var utils = _dereq_('../utils/common');
+  this.l_desc   = null;         /* desc. for literal tree */
+  this.d_desc   = null;         /* desc. for distance tree */
+  this.bl_desc  = null;         /* desc. for bit length tree */
 
-var MAXBITS = 15;
-var ENOUGH_LENS = 852;
-var ENOUGH_DISTS = 592;
-//var ENOUGH = (ENOUGH_LENS+ENOUGH_DISTS);
+  //ush bl_count[MAX_BITS+1];
+  this.bl_count = new utils.Buf16(MAX_BITS + 1);
+  /* number of codes at each bit length for an optimal tree */
 
-var CODES = 0;
-var LENS = 1;
-var DISTS = 2;
+  //int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
+  this.heap = new utils.Buf16(2 * L_CODES + 1);  /* heap used to build the Huffman trees */
+  zero(this.heap);
 
-var lbase = [ /* Length codes 257..285 base */
-  3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
-  35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
-];
+  this.heap_len = 0;               /* number of elements in the heap */
+  this.heap_max = 0;               /* element of largest frequency */
+  /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
+   * The same heap array is used to build all trees.
+   */
 
-var lext = [ /* Length codes 257..285 extra */
-  16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
-  19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78
-];
+  this.depth = new utils.Buf16(2 * L_CODES + 1); //uch depth[2*L_CODES+1];
+  zero(this.depth);
+  /* Depth of each subtree used as tie breaker for trees of equal frequency
+   */
 
-var dbase = [ /* Distance codes 0..29 base */
-  1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
-  257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
-  8193, 12289, 16385, 24577, 0, 0
-];
+  this.l_buf = 0;          /* buffer index for literals or lengths */
 
-var dext = [ /* Distance codes 0..29 extra */
-  16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
-  23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
-  28, 28, 29, 29, 64, 64
-];
-
-module.exports = function inflate_table(type, lens, lens_index, codes, table, table_index, work, opts)
-{
-  var bits = opts.bits;
-      //here = opts.here; /* table entry for duplication */
+  this.lit_bufsize = 0;
+  /* Size of match buffer for literals/lengths.  There are 4 reasons for
+   * limiting lit_bufsize to 64K:
+   *   - frequencies can be kept in 16 bit counters
+   *   - if compression is not successful for the first block, all input
+   *     data is still in the window so we can still emit a stored block even
+   *     when input comes from standard input.  (This can also be done for
+   *     all blocks if lit_bufsize is not greater than 32K.)
+   *   - if compression is not successful for a file smaller than 64K, we can
+   *     even emit a stored file instead of a stored block (saving 5 bytes).
+   *     This is applicable only for zip (not gzip or zlib).
+   *   - creating new Huffman trees less frequently may not provide fast
+   *     adaptation to changes in the input data statistics. (Take for
+   *     example a binary file with poorly compressible code followed by
+   *     a highly compressible string table.) Smaller buffer sizes give
+   *     fast adaptation but have of course the overhead of transmitting
+   *     trees more frequently.
+   *   - I can't count above 4
+   */
 
-  var len = 0;               /* a code's length in bits */
-  var sym = 0;               /* index of code symbols */
-  var min = 0, max = 0;          /* minimum and maximum code lengths */
-  var root = 0;              /* number of index bits for root table */
-  var curr = 0;              /* number of index bits for current table */
-  var drop = 0;              /* code bits to drop for sub-table */
-  var left = 0;                   /* number of prefix codes available */
-  var used = 0;              /* code entries in table used */
-  var huff = 0;              /* Huffman code */
-  var incr;              /* for incrementing code, index */
-  var fill;              /* index for replicating entries */
-  var low;               /* low bits for current root entry */
-  var mask;              /* mask for low root bits */
-  var next;             /* next available space in table */
-  var base = null;     /* base value table to use */
-  var base_index = 0;
-//  var shoextra;    /* extra bits table to use */
-  var end;                    /* use base and extra for symbol > end */
-  var count = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];    /* number of codes of each length */
-  var offs = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];     /* offsets in table for each length */
-  var extra = null;
-  var extra_index = 0;
+  this.last_lit = 0;      /* running index in l_buf */
 
-  var here_bits, here_op, here_val;
+  this.d_buf = 0;
+  /* Buffer index for distances. To simplify the code, d_buf and l_buf have
+   * the same number of elements. To use different lengths, an extra flag
+   * array would be necessary.
+   */
 
-  /*
-   Process a set of code lengths to create a canonical Huffman code.  The
-   code lengths are lens[0..codes-1].  Each length corresponds to the
-   symbols 0..codes-1.  The Huffman code is generated by first sorting the
-   symbols by length from short to long, and retaining the symbol order
-   for codes with equal lengths.  Then the code starts with all zero bits
-   for the first code of the shortest length, and the codes are integer
-   increments for the same length, and zeros are appended as the length
-   increases.  For the deflate format, these bits are stored backwards
-   from their more natural integer increment ordering, and so when the
-   decoding tables are built in the large loop below, the integer codes
-   are incremented backwards.
+  this.opt_len = 0;       /* bit length of current block with optimal trees */
+  this.static_len = 0;    /* bit length of current block with static trees */
+  this.matches = 0;       /* number of string matches in current block */
+  this.insert = 0;        /* bytes at end of window left to insert */
 
-   This routine assumes, but does not check, that all of the entries in
-   lens[] are in the range 0..MAXBITS.  The caller must assure this.
-   1..MAXBITS is interpreted as that code length.  zero means that that
-   symbol does not occur in this code.
 
-   The codes are sorted by computing a count of codes for each length,
-   creating from that a table of starting indices for each length in the
-   sorted table, and then entering the symbols in order in the sorted
-   table.  The sorted table is work[], with that space being provided by
-   the caller.
+  this.bi_buf = 0;
+  /* Output buffer. bits are inserted starting at the bottom (least
+   * significant bits).
+   */
+  this.bi_valid = 0;
+  /* Number of valid bits in bi_buf.  All bits above the last valid bit
+   * are always zero.
+   */
 
-   The length counts are used for other purposes as well, i.e. finding
-   the minimum and maximum length codes, determining if there are any
-   codes at all, checking for a valid set of lengths, and looking ahead
-   at length counts to determine sub-table sizes when building the
-   decoding tables.
+  // Used for window memory init. We safely ignore it for JS. That makes
+  // sense only for pointers and memory check tools.
+  //this.high_water = 0;
+  /* High water mark offset in window for initialized bytes -- bytes above
+   * this are set to zero in order to avoid memory check warnings when
+   * longest match routines access bytes past the input.  This is then
+   * updated to the new high water mark.
    */
+}
 
-  /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
-  for (len = 0; len <= MAXBITS; len++) {
-    count[len] = 0;
-  }
-  for (sym = 0; sym < codes; sym++) {
-    count[lens[lens_index + sym]]++;
-  }
 
-  /* bound code lengths, force root to be within code lengths */
-  root = bits;
-  for (max = MAXBITS; max >= 1; max--) {
-    if (count[max] !== 0) { break; }
-  }
-  if (root > max) {
-    root = max;
+function deflateResetKeep(strm) {
+  var s;
+
+  if (!strm || !strm.state) {
+    return err(strm, Z_STREAM_ERROR);
   }
-  if (max === 0) {                     /* no symbols to code at all */
-    //table.op[opts.table_index] = 64;  //here.op = (var char)64;    /* invalid code marker */
-    //table.bits[opts.table_index] = 1;   //here.bits = (var char)1;
-    //table.val[opts.table_index++] = 0;   //here.val = (var short)0;
-    table[table_index++] = (1 << 24) | (64 << 16) | 0;
 
+  strm.total_in = strm.total_out = 0;
+  strm.data_type = Z_UNKNOWN;
 
-    //table.op[opts.table_index] = 64;
-    //table.bits[opts.table_index] = 1;
-    //table.val[opts.table_index++] = 0;
-    table[table_index++] = (1 << 24) | (64 << 16) | 0;
+  s = strm.state;
+  s.pending = 0;
+  s.pending_out = 0;
 
-    opts.bits = 1;
-    return 0;     /* no symbols, but wait for decoding to report error */
-  }
-  for (min = 1; min < max; min++) {
-    if (count[min] !== 0) { break; }
-  }
-  if (root < min) {
-    root = min;
+  if (s.wrap < 0) {
+    s.wrap = -s.wrap;
+    /* was made negative by deflate(..., Z_FINISH); */
   }
+  s.status = (s.wrap ? INIT_STATE : BUSY_STATE);
+  strm.adler = (s.wrap === 2) ?
+    0  // crc32(0, Z_NULL, 0)
+  :
+    1; // adler32(0, Z_NULL, 0)
+  s.last_flush = Z_NO_FLUSH;
+  trees._tr_init(s);
+  return Z_OK;
+}
 
-  /* check for an over-subscribed or incomplete set of lengths */
-  left = 1;
-  for (len = 1; len <= MAXBITS; len++) {
-    left <<= 1;
-    left -= count[len];
-    if (left < 0) {
-      return -1;
-    }        /* over-subscribed */
-  }
-  if (left > 0 && (type === CODES || max !== 1)) {
-    return -1;                      /* incomplete set */
-  }
 
-  /* generate offsets into symbol table for each length for sorting */
-  offs[1] = 0;
-  for (len = 1; len < MAXBITS; len++) {
-    offs[len + 1] = offs[len] + count[len];
+function deflateReset(strm) {
+  var ret = deflateResetKeep(strm);
+  if (ret === Z_OK) {
+    lm_init(strm.state);
   }
+  return ret;
+}
 
-  /* sort symbols by length, by symbol order within each length */
-  for (sym = 0; sym < codes; sym++) {
-    if (lens[lens_index + sym] !== 0) {
-      work[offs[lens[lens_index + sym]]++] = sym;
-    }
-  }
 
-  /*
-   Create and fill in decoding tables.  In this loop, the table being
-   filled is at next and has curr index bits.  The code being used is huff
-   with length len.  That code is converted to an index by dropping drop
-   bits off of the bottom.  For codes where len is less than drop + curr,
-   those top drop + curr - len bits are incremented through all values to
-   fill the table with replicated entries.
+function deflateSetHeader(strm, head) {
+  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
+  if (strm.state.wrap !== 2) { return Z_STREAM_ERROR; }
+  strm.state.gzhead = head;
+  return Z_OK;
+}
 
-   root is the number of index bits for the root table.  When len exceeds
-   root, sub-tables are created pointed to by the root entry with an index
-   of the low root bits of huff.  This is saved in low to check for when a
-   new sub-table should be started.  drop is zero when the root table is
-   being filled, and drop is root when sub-tables are being filled.
 
-   When a new sub-table is needed, it is necessary to look ahead in the
-   code lengths to determine what size sub-table is needed.  The length
-   counts are used for this, and so count[] is decremented as codes are
-   entered in the tables.
+function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
+  if (!strm) { // === Z_NULL
+    return Z_STREAM_ERROR;
+  }
+  var wrap = 1;
 
-   used keeps track of how many table entries have been allocated from the
-   provided *table space.  It is checked for LENS and DIST tables against
-   the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
-   the initial root table size constants.  See the comments in inftrees.h
-   for more information.
+  if (level === Z_DEFAULT_COMPRESSION) {
+    level = 6;
+  }
 
-   sym increments through all symbols, and the loop terminates when
-   all codes of length max, i.e. all codes, have been processed.  This
-   routine permits incomplete codes, so another loop after this one fills
-   in the rest of the decoding tables with invalid code markers.
-   */
+  if (windowBits < 0) { /* suppress zlib wrapper */
+    wrap = 0;
+    windowBits = -windowBits;
+  }
 
-  /* set up for code type */
-  // poor man optimization - use if-else instead of switch,
-  // to avoid deopts in old v8
-  if (type === CODES) {
-    base = extra = work;    /* dummy value--not used */
-    end = 19;
+  else if (windowBits > 15) {
+    wrap = 2;           /* write gzip wrapper instead */
+    windowBits -= 16;
+  }
 
-  } else if (type === LENS) {
-    base = lbase;
-    base_index -= 257;
-    extra = lext;
-    extra_index -= 257;
-    end = 256;
 
-  } else {                    /* DISTS */
-    base = dbase;
-    extra = dext;
-    end = -1;
+  if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method !== Z_DEFLATED ||
+    windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
+    strategy < 0 || strategy > Z_FIXED) {
+    return err(strm, Z_STREAM_ERROR);
   }
 
-  /* initialize opts for loop */
-  huff = 0;                   /* starting code */
-  sym = 0;                    /* starting code symbol */
-  len = min;                  /* starting code length */
-  next = table_index;              /* current table to fill in */
-  curr = root;                /* current table index bits */
-  drop = 0;                   /* current bits to drop from code for index */
-  low = -1;                   /* trigger new sub-table when len > root */
-  used = 1 << root;          /* use root table entries */
-  mask = used - 1;            /* mask for comparing low */
 
-  /* check available table space */
-  if ((type === LENS && used > ENOUGH_LENS) ||
-    (type === DISTS && used > ENOUGH_DISTS)) {
-    return 1;
+  if (windowBits === 8) {
+    windowBits = 9;
   }
+  /* until 256-byte window bug fixed */
 
-  /* process all codes and make table entries */
-  for (;;) {
-    /* create table entry */
-    here_bits = len - drop;
-    if (work[sym] < end) {
-      here_op = 0;
-      here_val = work[sym];
-    }
-    else if (work[sym] > end) {
-      here_op = extra[extra_index + work[sym]];
-      here_val = base[base_index + work[sym]];
-    }
-    else {
-      here_op = 32 + 64;         /* end of block */
-      here_val = 0;
-    }
+  var s = new DeflateState();
 
-    /* replicate for those indices with low len bits equal to huff */
-    incr = 1 << (len - drop);
-    fill = 1 << curr;
-    min = fill;                 /* save offset to next table */
-    do {
-      fill -= incr;
-      table[next + (huff >> drop) + fill] = (here_bits << 24) | (here_op << 16) | here_val |0;
-    } while (fill !== 0);
+  strm.state = s;
+  s.strm = strm;
 
-    /* backwards increment the len-bit code huff */
-    incr = 1 << (len - 1);
-    while (huff & incr) {
-      incr >>= 1;
-    }
-    if (incr !== 0) {
-      huff &= incr - 1;
-      huff += incr;
-    } else {
-      huff = 0;
-    }
+  s.wrap = wrap;
+  s.gzhead = null;
+  s.w_bits = windowBits;
+  s.w_size = 1 << s.w_bits;
+  s.w_mask = s.w_size - 1;
 
-    /* go to next symbol, update count, len */
-    sym++;
-    if (--count[len] === 0) {
-      if (len === max) { break; }
-      len = lens[lens_index + work[sym]];
-    }
+  s.hash_bits = memLevel + 7;
+  s.hash_size = 1 << s.hash_bits;
+  s.hash_mask = s.hash_size - 1;
+  s.hash_shift = ~~((s.hash_bits + MIN_MATCH - 1) / MIN_MATCH);
 
-    /* create new sub-table if needed */
-    if (len > root && (huff & mask) !== low) {
-      /* if first time, transition to sub-tables */
-      if (drop === 0) {
-        drop = root;
-      }
+  s.window = new utils.Buf8(s.w_size * 2);
+  s.head = new utils.Buf16(s.hash_size);
+  s.prev = new utils.Buf16(s.w_size);
 
-      /* increment past last table */
-      next += min;            /* here min is 1 << curr */
+  // Don't need mem init magic for JS.
+  //s.high_water = 0;  /* nothing written to s->window yet */
 
-      /* determine length of next table */
-      curr = len - drop;
-      left = 1 << curr;
-      while (curr + drop < max) {
-        left -= count[curr + drop];
-        if (left <= 0) { break; }
-        curr++;
-        left <<= 1;
-      }
+  s.lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
 
-      /* check for enough space */
-      used += 1 << curr;
-      if ((type === LENS && used > ENOUGH_LENS) ||
-        (type === DISTS && used > ENOUGH_DISTS)) {
-        return 1;
-      }
+  s.pending_buf_size = s.lit_bufsize * 4;
 
-      /* point entry in root table to sub-table */
-      low = huff & mask;
-      /*table.op[low] = curr;
-      table.bits[low] = root;
-      table.val[low] = next - opts.table_index;*/
-      table[low] = (root << 24) | (curr << 16) | (next - table_index) |0;
-    }
-  }
+  //overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
+  //s->pending_buf = (uchf *) overlay;
+  s.pending_buf = new utils.Buf8(s.pending_buf_size);
 
-  /* fill in remaining table entry if code is incomplete (guaranteed to have
-   at most one remaining entry, since if the code is incomplete, the
-   maximum code length that was allowed to get this far is one bit) */
-  if (huff !== 0) {
-    //table.op[next + huff] = 64;            /* invalid code marker */
-    //table.bits[next + huff] = len - drop;
-    //table.val[next + huff] = 0;
-    table[next + huff] = ((len - drop) << 24) | (64 << 16) |0;
-  }
+  // It is offset from `s.pending_buf` (size is `s.lit_bufsize * 2`)
+  //s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
+  s.d_buf = 1 * s.lit_bufsize;
 
-  /* set return parameters */
-  //opts.table_index += used;
-  opts.bits = root;
-  return 0;
-};
+  //s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
+  s.l_buf = (1 + 2) * s.lit_bufsize;
 
-},{"../utils/common":163}],173:[function(_dereq_,module,exports){
-'use strict';
+  s.level = level;
+  s.strategy = strategy;
+  s.method = method;
 
-module.exports = {
-  2:      'need dictionary',     /* Z_NEED_DICT       2  */
-  1:      'stream end',          /* Z_STREAM_END      1  */
-  0:      '',                    /* Z_OK              0  */
-  '-1':   'file error',          /* Z_ERRNO         (-1) */
-  '-2':   'stream error',        /* Z_STREAM_ERROR  (-2) */
-  '-3':   'data error',          /* Z_DATA_ERROR    (-3) */
-  '-4':   'insufficient memory', /* Z_MEM_ERROR     (-4) */
-  '-5':   'buffer error',        /* Z_BUF_ERROR     (-5) */
-  '-6':   'incompatible version' /* Z_VERSION_ERROR (-6) */
-};
+  return deflateReset(strm);
+}
 
-},{}],174:[function(_dereq_,module,exports){
-'use strict';
+function deflateInit(strm, level) {
+  return deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+}
 
 
-var utils = _dereq_('../utils/common');
+function deflate(strm, flush) {
+  var old_flush, s;
+  var beg, val; // for gzip header write only
 
-/* Public constants ==========================================================*/
-/* ===========================================================================*/
+  if (!strm || !strm.state ||
+    flush > Z_BLOCK || flush < 0) {
+    return strm ? err(strm, Z_STREAM_ERROR) : Z_STREAM_ERROR;
+  }
 
+  s = strm.state;
 
-//var Z_FILTERED          = 1;
-//var Z_HUFFMAN_ONLY      = 2;
-//var Z_RLE               = 3;
-var Z_FIXED               = 4;
-//var Z_DEFAULT_STRATEGY  = 0;
+  if (!strm.output ||
+      (!strm.input && strm.avail_in !== 0) ||
+      (s.status === FINISH_STATE && flush !== Z_FINISH)) {
+    return err(strm, (strm.avail_out === 0) ? Z_BUF_ERROR : Z_STREAM_ERROR);
+  }
 
-/* Possible values of the data_type field (though see inflate()) */
-var Z_BINARY              = 0;
-var Z_TEXT                = 1;
-//var Z_ASCII             = 1; // = Z_TEXT
-var Z_UNKNOWN             = 2;
+  s.strm = strm; /* just in case */
+  old_flush = s.last_flush;
+  s.last_flush = flush;
 
-/*============================================================================*/
+  /* Write the header */
+  if (s.status === INIT_STATE) {
 
+    if (s.wrap === 2) { // GZIP header
+      strm.adler = 0;  //crc32(0L, Z_NULL, 0);
+      put_byte(s, 31);
+      put_byte(s, 139);
+      put_byte(s, 8);
+      if (!s.gzhead) { // s->gzhead == Z_NULL
+        put_byte(s, 0);
+        put_byte(s, 0);
+        put_byte(s, 0);
+        put_byte(s, 0);
+        put_byte(s, 0);
+        put_byte(s, s.level === 9 ? 2 :
+                    (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
+                     4 : 0));
+        put_byte(s, OS_CODE);
+        s.status = BUSY_STATE;
+      }
+      else {
+        put_byte(s, (s.gzhead.text ? 1 : 0) +
+                    (s.gzhead.hcrc ? 2 : 0) +
+                    (!s.gzhead.extra ? 0 : 4) +
+                    (!s.gzhead.name ? 0 : 8) +
+                    (!s.gzhead.comment ? 0 : 16)
+                );
+        put_byte(s, s.gzhead.time & 0xff);
+        put_byte(s, (s.gzhead.time >> 8) & 0xff);
+        put_byte(s, (s.gzhead.time >> 16) & 0xff);
+        put_byte(s, (s.gzhead.time >> 24) & 0xff);
+        put_byte(s, s.level === 9 ? 2 :
+                    (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
+                     4 : 0));
+        put_byte(s, s.gzhead.os & 0xff);
+        if (s.gzhead.extra && s.gzhead.extra.length) {
+          put_byte(s, s.gzhead.extra.length & 0xff);
+          put_byte(s, (s.gzhead.extra.length >> 8) & 0xff);
+        }
+        if (s.gzhead.hcrc) {
+          strm.adler = crc32(strm.adler, s.pending_buf, s.pending, 0);
+        }
+        s.gzindex = 0;
+        s.status = EXTRA_STATE;
+      }
+    }
+    else // DEFLATE header
+    {
+      var header = (Z_DEFLATED + ((s.w_bits - 8) << 4)) << 8;
+      var level_flags = -1;
 
-function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }
+      if (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2) {
+        level_flags = 0;
+      } else if (s.level < 6) {
+        level_flags = 1;
+      } else if (s.level === 6) {
+        level_flags = 2;
+      } else {
+        level_flags = 3;
+      }
+      header |= (level_flags << 6);
+      if (s.strstart !== 0) { header |= PRESET_DICT; }
+      header += 31 - (header % 31);
 
-// From zutil.h
+      s.status = BUSY_STATE;
+      putShortMSB(s, header);
 
-var STORED_BLOCK = 0;
-var STATIC_TREES = 1;
-var DYN_TREES    = 2;
-/* The three kinds of block type */
+      /* Save the adler32 of the preset dictionary: */
+      if (s.strstart !== 0) {
+        putShortMSB(s, strm.adler >>> 16);
+        putShortMSB(s, strm.adler & 0xffff);
+      }
+      strm.adler = 1; // adler32(0L, Z_NULL, 0);
+    }
+  }
 
-var MIN_MATCH    = 3;
-var MAX_MATCH    = 258;
-/* The minimum and maximum match lengths */
-
-// From deflate.h
-/* ===========================================================================
- * Internal compression state.
- */
-
-var LENGTH_CODES  = 29;
-/* number of length codes, not counting the special END_BLOCK code */
-
-var LITERALS      = 256;
-/* number of literal bytes 0..255 */
+//#ifdef GZIP
+  if (s.status === EXTRA_STATE) {
+    if (s.gzhead.extra/* != Z_NULL*/) {
+      beg = s.pending;  /* start of bytes to update crc */
 
-var L_CODES       = LITERALS + 1 + LENGTH_CODES;
-/* number of Literal or Length codes, including the END_BLOCK code */
+      while (s.gzindex < (s.gzhead.extra.length & 0xffff)) {
+        if (s.pending === s.pending_buf_size) {
+          if (s.gzhead.hcrc && s.pending > beg) {
+            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
+          }
+          flush_pending(strm);
+          beg = s.pending;
+          if (s.pending === s.pending_buf_size) {
+            break;
+          }
+        }
+        put_byte(s, s.gzhead.extra[s.gzindex] & 0xff);
+        s.gzindex++;
+      }
+      if (s.gzhead.hcrc && s.pending > beg) {
+        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
+      }
+      if (s.gzindex === s.gzhead.extra.length) {
+        s.gzindex = 0;
+        s.status = NAME_STATE;
+      }
+    }
+    else {
+      s.status = NAME_STATE;
+    }
+  }
+  if (s.status === NAME_STATE) {
+    if (s.gzhead.name/* != Z_NULL*/) {
+      beg = s.pending;  /* start of bytes to update crc */
+      //int val;
 
-var D_CODES       = 30;
-/* number of distance codes */
+      do {
+        if (s.pending === s.pending_buf_size) {
+          if (s.gzhead.hcrc && s.pending > beg) {
+            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
+          }
+          flush_pending(strm);
+          beg = s.pending;
+          if (s.pending === s.pending_buf_size) {
+            val = 1;
+            break;
+          }
+        }
+        // JS specific: little magic to add zero terminator to end of string
+        if (s.gzindex < s.gzhead.name.length) {
+          val = s.gzhead.name.charCodeAt(s.gzindex++) & 0xff;
+        } else {
+          val = 0;
+        }
+        put_byte(s, val);
+      } while (val !== 0);
 
-var BL_CODES      = 19;
-/* number of codes used to transfer the bit lengths */
+      if (s.gzhead.hcrc && s.pending > beg) {
+        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
+      }
+      if (val === 0) {
+        s.gzindex = 0;
+        s.status = COMMENT_STATE;
+      }
+    }
+    else {
+      s.status = COMMENT_STATE;
+    }
+  }
+  if (s.status === COMMENT_STATE) {
+    if (s.gzhead.comment/* != Z_NULL*/) {
+      beg = s.pending;  /* start of bytes to update crc */
+      //int val;
 
-var HEAP_SIZE     = 2 * L_CODES + 1;
-/* maximum heap size */
+      do {
+        if (s.pending === s.pending_buf_size) {
+          if (s.gzhead.hcrc && s.pending > beg) {
+            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
+          }
+          flush_pending(strm);
+          beg = s.pending;
+          if (s.pending === s.pending_buf_size) {
+            val = 1;
+            break;
+          }
+        }
+        // JS specific: little magic to add zero terminator to end of string
+        if (s.gzindex < s.gzhead.comment.length) {
+          val = s.gzhead.comment.charCodeAt(s.gzindex++) & 0xff;
+        } else {
+          val = 0;
+        }
+        put_byte(s, val);
+      } while (val !== 0);
 
-var MAX_BITS      = 15;
-/* All codes must not exceed MAX_BITS bits */
+      if (s.gzhead.hcrc && s.pending > beg) {
+        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
+      }
+      if (val === 0) {
+        s.status = HCRC_STATE;
+      }
+    }
+    else {
+      s.status = HCRC_STATE;
+    }
+  }
+  if (s.status === HCRC_STATE) {
+    if (s.gzhead.hcrc) {
+      if (s.pending + 2 > s.pending_buf_size) {
+        flush_pending(strm);
+      }
+      if (s.pending + 2 <= s.pending_buf_size) {
+        put_byte(s, strm.adler & 0xff);
+        put_byte(s, (strm.adler >> 8) & 0xff);
+        strm.adler = 0; //crc32(0L, Z_NULL, 0);
+        s.status = BUSY_STATE;
+      }
+    }
+    else {
+      s.status = BUSY_STATE;
+    }
+  }
+//#endif
 
-var Buf_size      = 16;
-/* size of bit buffer in bi_buf */
+  /* Flush as much pending output as possible */
+  if (s.pending !== 0) {
+    flush_pending(strm);
+    if (strm.avail_out === 0) {
+      /* Since avail_out is 0, deflate will be called again with
+       * more output space, but possibly with both pending and
+       * avail_in equal to zero. There won't be anything to do,
+       * but this is not an error situation so make sure we
+       * return OK instead of BUF_ERROR at next call of deflate:
+       */
+      s.last_flush = -1;
+      return Z_OK;
+    }
 
+    /* Make sure there is something to do and avoid duplicate consecutive
+     * flushes. For repeated and useless calls with Z_FINISH, we keep
+     * returning Z_STREAM_END instead of Z_BUF_ERROR.
+     */
+  } else if (strm.avail_in === 0 && rank(flush) <= rank(old_flush) &&
+    flush !== Z_FINISH) {
+    return err(strm, Z_BUF_ERROR);
+  }
 
-/* ===========================================================================
- * Constants
- */
+  /* User must not provide more input after the first FINISH: */
+  if (s.status === FINISH_STATE && strm.avail_in !== 0) {
+    return err(strm, Z_BUF_ERROR);
+  }
 
-var MAX_BL_BITS = 7;
-/* Bit length codes must not exceed MAX_BL_BITS bits */
+  /* Start a new block or continue the current one.
+   */
+  if (strm.avail_in !== 0 || s.lookahead !== 0 ||
+    (flush !== Z_NO_FLUSH && s.status !== FINISH_STATE)) {
+    var bstate = (s.strategy === Z_HUFFMAN_ONLY) ? deflate_huff(s, flush) :
+      (s.strategy === Z_RLE ? deflate_rle(s, flush) :
+        configuration_table[s.level].func(s, flush));
 
-var END_BLOCK   = 256;
-/* end of block literal code */
+    if (bstate === BS_FINISH_STARTED || bstate === BS_FINISH_DONE) {
+      s.status = FINISH_STATE;
+    }
+    if (bstate === BS_NEED_MORE || bstate === BS_FINISH_STARTED) {
+      if (strm.avail_out === 0) {
+        s.last_flush = -1;
+        /* avoid BUF_ERROR next call, see above */
+      }
+      return Z_OK;
+      /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
+       * of deflate should use the same flush parameter to make sure
+       * that the flush is complete. So we don't have to output an
+       * empty block here, this will be done at next call. This also
+       * ensures that for a very small output buffer, we emit at most
+       * one empty block.
+       */
+    }
+    if (bstate === BS_BLOCK_DONE) {
+      if (flush === Z_PARTIAL_FLUSH) {
+        trees._tr_align(s);
+      }
+      else if (flush !== Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
 
-var REP_3_6     = 16;
-/* repeat previous bit length 3-6 times (2 bits of repeat count) */
+        trees._tr_stored_block(s, 0, 0, false);
+        /* For a full flush, this empty block will be recognized
+         * as a special marker by inflate_sync().
+         */
+        if (flush === Z_FULL_FLUSH) {
+          /*** CLEAR_HASH(s); ***/             /* forget history */
+          zero(s.head); // Fill with NIL (= 0);
 
-var REPZ_3_10   = 17;
-/* repeat a zero length 3-10 times  (3 bits of repeat count) */
+          if (s.lookahead === 0) {
+            s.strstart = 0;
+            s.block_start = 0;
+            s.insert = 0;
+          }
+        }
+      }
+      flush_pending(strm);
+      if (strm.avail_out === 0) {
+        s.last_flush = -1; /* avoid BUF_ERROR at next call, see above */
+        return Z_OK;
+      }
+    }
+  }
+  //Assert(strm->avail_out > 0, "bug2");
+  //if (strm.avail_out <= 0) { throw new Error("bug2");}
 
-var REPZ_11_138 = 18;
-/* repeat a zero length 11-138 times  (7 bits of repeat count) */
+  if (flush !== Z_FINISH) { return Z_OK; }
+  if (s.wrap <= 0) { return Z_STREAM_END; }
 
-/* eslint-disable comma-spacing,array-bracket-spacing */
-var extra_lbits =   /* extra bits for each length code */
-  [0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0];
+  /* Write the trailer */
+  if (s.wrap === 2) {
+    put_byte(s, strm.adler & 0xff);
+    put_byte(s, (strm.adler >> 8) & 0xff);
+    put_byte(s, (strm.adler >> 16) & 0xff);
+    put_byte(s, (strm.adler >> 24) & 0xff);
+    put_byte(s, strm.total_in & 0xff);
+    put_byte(s, (strm.total_in >> 8) & 0xff);
+    put_byte(s, (strm.total_in >> 16) & 0xff);
+    put_byte(s, (strm.total_in >> 24) & 0xff);
+  }
+  else
+  {
+    putShortMSB(s, strm.adler >>> 16);
+    putShortMSB(s, strm.adler & 0xffff);
+  }
 
-var extra_dbits =   /* extra bits for each distance code */
-  [0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13];
+  flush_pending(strm);
+  /* If avail_out is zero, the application will call deflate again
+   * to flush the rest.
+   */
+  if (s.wrap > 0) { s.wrap = -s.wrap; }
+  /* write the trailer only once! */
+  return s.pending !== 0 ? Z_OK : Z_STREAM_END;
+}
 
-var extra_blbits =  /* extra bits for each bit length code */
-  [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7];
+function deflateEnd(strm) {
+  var status;
 
-var bl_order =
-  [16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15];
-/* eslint-enable comma-spacing,array-bracket-spacing */
+  if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
+    return Z_STREAM_ERROR;
+  }
 
-/* The lengths of the bit length codes are sent in order of decreasing
- * probability, to avoid transmitting the lengths for unused bit length codes.
- */
+  status = strm.state.status;
+  if (status !== INIT_STATE &&
+    status !== EXTRA_STATE &&
+    status !== NAME_STATE &&
+    status !== COMMENT_STATE &&
+    status !== HCRC_STATE &&
+    status !== BUSY_STATE &&
+    status !== FINISH_STATE
+  ) {
+    return err(strm, Z_STREAM_ERROR);
+  }
 
-/* ===========================================================================
- * Local data. These are initialized only once.
- */
+  strm.state = null;
 
-// We pre-fill arrays with 0 to avoid uninitialized gaps
+  return status === BUSY_STATE ? err(strm, Z_DATA_ERROR) : Z_OK;
+}
 
-var DIST_CODE_LEN = 512; /* see definition of array dist_code below */
 
-// !!!! Use flat array insdead of structure, Freq = i*2, Len = i*2+1
-var static_ltree  = new Array((L_CODES + 2) * 2);
-zero(static_ltree);
-/* The static literal tree. Since the bit lengths are imposed, there is no
- * need for the L_CODES extra codes used during heap construction. However
- * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
- * below).
+/* =========================================================================
+ * Initializes the compression dictionary from the given byte
+ * sequence without producing any compressed output.
  */
+function deflateSetDictionary(strm, dictionary) {
+  var dictLength = dictionary.length;
 
-var static_dtree  = new Array(D_CODES * 2);
-zero(static_dtree);
-/* The static distance tree. (Actually a trivial tree since all codes use
- * 5 bits.)
- */
+  var s;
+  var str, n;
+  var wrap;
+  var avail;
+  var next;
+  var input;
+  var tmpDict;
 
-var _dist_code    = new Array(DIST_CODE_LEN);
-zero(_dist_code);
-/* Distance codes. The first 256 values correspond to the distances
- * 3 .. 258, the last 256 values correspond to the top 8 bits of
- * the 15 bit distances.
- */
+  if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
+    return Z_STREAM_ERROR;
+  }
 
-var _length_code  = new Array(MAX_MATCH - MIN_MATCH + 1);
-zero(_length_code);
-/* length code for each normalized match length (0 == MIN_MATCH) */
+  s = strm.state;
+  wrap = s.wrap;
 
-var base_length   = new Array(LENGTH_CODES);
-zero(base_length);
-/* First normalized length for each code (0 = MIN_MATCH) */
+  if (wrap === 2 || (wrap === 1 && s.status !== INIT_STATE) || s.lookahead) {
+    return Z_STREAM_ERROR;
+  }
 
-var base_dist     = new Array(D_CODES);
-zero(base_dist);
-/* First normalized distance for each code (0 = distance of 1) */
+  /* when using zlib wrappers, compute Adler-32 for provided dictionary */
+  if (wrap === 1) {
+    /* adler32(strm->adler, dictionary, dictLength); */
+    strm.adler = adler32(strm.adler, dictionary, dictLength, 0);
+  }
 
+  s.wrap = 0;   /* avoid computing Adler-32 in read_buf */
 
-function StaticTreeDesc(static_tree, extra_bits, extra_base, elems, max_length) {
+  /* if dictionary would fill window, just replace the history */
+  if (dictLength >= s.w_size) {
+    if (wrap === 0) {            /* already empty otherwise */
+      /*** CLEAR_HASH(s); ***/
+      zero(s.head); // Fill with NIL (= 0);
+      s.strstart = 0;
+      s.block_start = 0;
+      s.insert = 0;
+    }
+    /* use the tail */
+    // dictionary = dictionary.slice(dictLength - s.w_size);
+    tmpDict = new utils.Buf8(s.w_size);
+    utils.arraySet(tmpDict, dictionary, dictLength - s.w_size, s.w_size, 0);
+    dictionary = tmpDict;
+    dictLength = s.w_size;
+  }
+  /* insert dictionary into window and hash */
+  avail = strm.avail_in;
+  next = strm.next_in;
+  input = strm.input;
+  strm.avail_in = dictLength;
+  strm.next_in = 0;
+  strm.input = dictionary;
+  fill_window(s);
+  while (s.lookahead >= MIN_MATCH) {
+    str = s.strstart;
+    n = s.lookahead - (MIN_MATCH - 1);
+    do {
+      /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
+      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;
 
-  this.static_tree  = static_tree;  /* static tree or NULL */
-  this.extra_bits   = extra_bits;   /* extra bits for each code or NULL */
-  this.extra_base   = extra_base;   /* base index for extra_bits */
-  this.elems        = elems;        /* max number of elements in the tree */
-  this.max_length   = max_length;   /* max bit length for the codes */
+      s.prev[str & s.w_mask] = s.head[s.ins_h];
 
-  // show if `static_tree` has data or dummy - needed for monomorphic objects
-  this.has_stree    = static_tree && static_tree.length;
+      s.head[s.ins_h] = str;
+      str++;
+    } while (--n);
+    s.strstart = str;
+    s.lookahead = MIN_MATCH - 1;
+    fill_window(s);
+  }
+  s.strstart += s.lookahead;
+  s.block_start = s.strstart;
+  s.insert = s.lookahead;
+  s.lookahead = 0;
+  s.match_length = s.prev_length = MIN_MATCH - 1;
+  s.match_available = 0;
+  strm.next_in = next;
+  strm.input = input;
+  strm.avail_in = avail;
+  s.wrap = wrap;
+  return Z_OK;
 }
 
 
-var static_l_desc;
-var static_d_desc;
-var static_bl_desc;
-
+exports.deflateInit = deflateInit;
+exports.deflateInit2 = deflateInit2;
+exports.deflateReset = deflateReset;
+exports.deflateResetKeep = deflateResetKeep;
+exports.deflateSetHeader = deflateSetHeader;
+exports.deflate = deflate;
+exports.deflateEnd = deflateEnd;
+exports.deflateSetDictionary = deflateSetDictionary;
+exports.deflateInfo = 'pako deflate (from Nodeca project)';
 
-function TreeDesc(dyn_tree, stat_desc) {
-  this.dyn_tree = dyn_tree;     /* the dynamic tree */
-  this.max_code = 0;            /* largest code with non zero frequency */
-  this.stat_desc = stat_desc;   /* the corresponding static tree */
-}
+/* Not implemented
+exports.deflateBound = deflateBound;
+exports.deflateCopy = deflateCopy;
+exports.deflateParams = deflateParams;
+exports.deflatePending = deflatePending;
+exports.deflatePrime = deflatePrime;
+exports.deflateTune = deflateTune;
+*/
 
+},{"../utils/common":167,"./adler32":169,"./crc32":171,"./messages":177,"./trees":178}],173:[function(_dereq_,module,exports){
+'use strict';
 
 
-function d_code(dist) {
-  return dist < 256 ? _dist_code[dist] : _dist_code[256 + (dist >>> 7)];
-}
+function GZheader() {
+  /* true if compressed data believed to be text */
+  this.text       = 0;
+  /* modification time */
+  this.time       = 0;
+  /* extra flags (not used when writing a gzip file) */
+  this.xflags     = 0;
+  /* operating system */
+  this.os         = 0;
+  /* pointer to extra field or Z_NULL if none */
+  this.extra      = null;
+  /* extra field length (valid if extra != Z_NULL) */
+  this.extra_len  = 0; // Actually, we don't need it in JS,
+                       // but leave for few code modifications
 
+  //
+  // Setup limits is not necessary because in js we should not preallocate memory
+  // for inflate use constant limit in 65536 bytes
+  //
 
-/* ===========================================================================
- * Output a short LSB first on the stream.
- * IN assertion: there is enough room in pendingBuf.
- */
-function put_short(s, w) {
-//    put_byte(s, (uch)((w) & 0xff));
-//    put_byte(s, (uch)((ush)(w) >> 8));
-  s.pending_buf[s.pending++] = (w) & 0xff;
-  s.pending_buf[s.pending++] = (w >>> 8) & 0xff;
+  /* space at extra (only when reading header) */
+  // this.extra_max  = 0;
+  /* pointer to zero-terminated file name or Z_NULL */
+  this.name       = '';
+  /* space at name (only when reading header) */
+  // this.name_max   = 0;
+  /* pointer to zero-terminated comment or Z_NULL */
+  this.comment    = '';
+  /* space at comment (only when reading header) */
+  // this.comm_max   = 0;
+  /* true if there was or will be a header crc */
+  this.hcrc       = 0;
+  /* true when done reading gzip header (not used when writing a gzip file) */
+  this.done       = false;
 }
 
+module.exports = GZheader;
 
-/* ===========================================================================
- * Send a value on a given number of bits.
- * IN assertion: length <= 16 and value fits in length bits.
- */
-function send_bits(s, value, length) {
-  if (s.bi_valid > (Buf_size - length)) {
-    s.bi_buf |= (value << s.bi_valid) & 0xffff;
-    put_short(s, s.bi_buf);
-    s.bi_buf = value >> (Buf_size - s.bi_valid);
-    s.bi_valid += length - Buf_size;
-  } else {
-    s.bi_buf |= (value << s.bi_valid) & 0xffff;
-    s.bi_valid += length;
-  }
-}
+},{}],174:[function(_dereq_,module,exports){
+'use strict';
 
+// See state defs from inflate.js
+var BAD = 30;       /* got a data error -- remain here until reset */
+var TYPE = 12;      /* i: waiting for type bits, including last-flag bit */
 
-function send_code(s, c, tree) {
-  send_bits(s, tree[c * 2]/*.Code*/, tree[c * 2 + 1]/*.Len*/);
-}
+/*
+   Decode literal, length, and distance codes and write out the resulting
+   literal and match bytes until either not enough input or output is
+   available, an end-of-block is encountered, or a data error is encountered.
+   When large enough input and output buffers are supplied to inflate(), for
+   example, a 16K input buffer and a 64K output buffer, more than 95% of the
+   inflate execution time is spent in this routine.
 
+   Entry assumptions:
 
-/* ===========================================================================
- * Reverse the first len bits of a code, using straightforward code (a faster
- * method would use a table)
- * IN assertion: 1 <= len <= 15
- */
-function bi_reverse(code, len) {
-  var res = 0;
-  do {
-    res |= code & 1;
-    code >>>= 1;
-    res <<= 1;
-  } while (--len > 0);
-  return res >>> 1;
-}
+        state.mode === LEN
+        strm.avail_in >= 6
+        strm.avail_out >= 258
+        start >= strm.avail_out
+        state.bits < 8
 
+   On return, state.mode is one of:
 
-/* ===========================================================================
- * Flush the bit buffer, keeping at most 7 bits in it.
- */
-function bi_flush(s) {
-  if (s.bi_valid === 16) {
-    put_short(s, s.bi_buf);
-    s.bi_buf = 0;
-    s.bi_valid = 0;
+        LEN -- ran out of enough output space or enough available input
+        TYPE -- reached end of block code, inflate() to interpret next block
+        BAD -- error in block data
 
-  } else if (s.bi_valid >= 8) {
-    s.pending_buf[s.pending++] = s.bi_buf & 0xff;
-    s.bi_buf >>= 8;
-    s.bi_valid -= 8;
-  }
-}
+   Notes:
 
+    - The maximum input bits used by a length/distance pair is 15 bits for the
+      length code, 5 bits for the length extra, 15 bits for the distance code,
+      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
+      Therefore if strm.avail_in >= 6, then there is enough input to avoid
+      checking for available input while decoding.
 
-/* ===========================================================================
- * Compute the optimal bit lengths for a tree and update the total bit length
- * for the current block.
- * IN assertion: the fields freq and dad are set, heap[heap_max] and
- *    above are the tree nodes sorted by increasing frequency.
- * OUT assertions: the field len is set to the optimal bit length, the
- *     array bl_count contains the frequencies for each bit length.
- *     The length opt_len is updated; static_len is also updated if stree is
- *     not null.
+    - The maximum bytes that a single length/distance pair can output is 258
+      bytes, which is the maximum length that can be coded.  inflate_fast()
+      requires strm.avail_out >= 258 for each loop to avoid checking for
+      output space.
  */
-function gen_bitlen(s, desc)
-//    deflate_state *s;
-//    tree_desc *desc;    /* the tree descriptor */
-{
-  var tree            = desc.dyn_tree;
-  var max_code        = desc.max_code;
-  var stree           = desc.stat_desc.static_tree;
-  var has_stree       = desc.stat_desc.has_stree;
-  var extra           = desc.stat_desc.extra_bits;
-  var base            = desc.stat_desc.extra_base;
-  var max_length      = desc.stat_desc.max_length;
-  var h;              /* heap index */
-  var n, m;           /* iterate over the tree elements */
-  var bits;           /* bit length */
-  var xbits;          /* extra bits */
-  var f;              /* frequency */
-  var overflow = 0;   /* number of elements with bit length too large */
+module.exports = function inflate_fast(strm, start) {
+  var state;
+  var _in;                    /* local strm.input */
+  var last;                   /* have enough input while in < last */
+  var _out;                   /* local strm.output */
+  var beg;                    /* inflate()'s initial strm.output */
+  var end;                    /* while out < end, enough space available */
+//#ifdef INFLATE_STRICT
+  var dmax;                   /* maximum distance from zlib header */
+//#endif
+  var wsize;                  /* window size or zero if not using window */
+  var whave;                  /* valid bytes in the window */
+  var wnext;                  /* window write index */
+  // Use `s_window` instead `window`, avoid conflict with instrumentation tools
+  var s_window;               /* allocated sliding window, if wsize != 0 */
+  var hold;                   /* local strm.hold */
+  var bits;                   /* local strm.bits */
+  var lcode;                  /* local strm.lencode */
+  var dcode;                  /* local strm.distcode */
+  var lmask;                  /* mask for first level of length codes */
+  var dmask;                  /* mask for first level of distance codes */
+  var here;                   /* retrieved table entry */
+  var op;                     /* code bits, operation, extra bits, or */
+                              /*  window position, window bytes to copy */
+  var len;                    /* match length, unused bytes */
+  var dist;                   /* match distance */
+  var from;                   /* where to copy match from */
+  var from_source;
 
-  for (bits = 0; bits <= MAX_BITS; bits++) {
-    s.bl_count[bits] = 0;
-  }
 
-  /* In a first pass, compute the optimal bit lengths (which may
-   * overflow in the case of the bit length tree).
-   */
-  tree[s.heap[s.heap_max] * 2 + 1]/*.Len*/ = 0; /* root of the heap */
+  var input, output; // JS specific, because we have no pointers
 
-  for (h = s.heap_max + 1; h < HEAP_SIZE; h++) {
-    n = s.heap[h];
-    bits = tree[tree[n * 2 + 1]/*.Dad*/ * 2 + 1]/*.Len*/ + 1;
-    if (bits > max_length) {
-      bits = max_length;
-      overflow++;
-    }
-    tree[n * 2 + 1]/*.Len*/ = bits;
-    /* We overwrite tree[n].Dad which is no longer needed */
+  /* copy state to local variables */
+  state = strm.state;
+  //here = state.here;
+  _in = strm.next_in;
+  input = strm.input;
+  last = _in + (strm.avail_in - 5);
+  _out = strm.next_out;
+  output = strm.output;
+  beg = _out - (start - strm.avail_out);
+  end = _out + (strm.avail_out - 257);
+//#ifdef INFLATE_STRICT
+  dmax = state.dmax;
+//#endif
+  wsize = state.wsize;
+  whave = state.whave;
+  wnext = state.wnext;
+  s_window = state.window;
+  hold = state.hold;
+  bits = state.bits;
+  lcode = state.lencode;
+  dcode = state.distcode;
+  lmask = (1 << state.lenbits) - 1;
+  dmask = (1 << state.distbits) - 1;
 
-    if (n > max_code) { continue; } /* not a leaf node */
 
-    s.bl_count[bits]++;
-    xbits = 0;
-    if (n >= base) {
-      xbits = extra[n - base];
-    }
-    f = tree[n * 2]/*.Freq*/;
-    s.opt_len += f * (bits + xbits);
-    if (has_stree) {
-      s.static_len += f * (stree[n * 2 + 1]/*.Len*/ + xbits);
+  /* decode literals and length/distances until end-of-block or not enough
+     input data or output space */
+
+  top:
+  do {
+    if (bits < 15) {
+      hold += input[_in++] << bits;
+      bits += 8;
+      hold += input[_in++] << bits;
+      bits += 8;
     }
-  }
-  if (overflow === 0) { return; }
 
-  // Trace((stderr,"\nbit length overflow\n"));
-  /* This happens for example on obj2 and pic of the Calgary corpus */
+    here = lcode[hold & lmask];
 
-  /* Find the first bit length which could increase: */
-  do {
-    bits = max_length - 1;
-    while (s.bl_count[bits] === 0) { bits--; }
-    s.bl_count[bits]--;      /* move one leaf down the tree */
-    s.bl_count[bits + 1] += 2; /* move one overflow item as its brother */
-    s.bl_count[max_length]--;
-    /* The brother of the overflow item also moves one step up,
-     * but this does not affect bl_count[max_length]
-     */
-    overflow -= 2;
-  } while (overflow > 0);
+    dolen:
+    for (;;) { // Goto emulation
+      op = here >>> 24/*here.bits*/;
+      hold >>>= op;
+      bits -= op;
+      op = (here >>> 16) & 0xff/*here.op*/;
+      if (op === 0) {                          /* literal */
+        //Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+        //        "inflate:         literal '%c'\n" :
+        //        "inflate:         literal 0x%02x\n", here.val));
+        output[_out++] = here & 0xffff/*here.val*/;
+      }
+      else if (op & 16) {                     /* length base */
+        len = here & 0xffff/*here.val*/;
+        op &= 15;                           /* number of extra bits */
+        if (op) {
+          if (bits < op) {
+            hold += input[_in++] << bits;
+            bits += 8;
+          }
+          len += hold & ((1 << op) - 1);
+          hold >>>= op;
+          bits -= op;
+        }
+        //Tracevv((stderr, "inflate:         length %u\n", len));
+        if (bits < 15) {
+          hold += input[_in++] << bits;
+          bits += 8;
+          hold += input[_in++] << bits;
+          bits += 8;
+        }
+        here = dcode[hold & dmask];
 
-  /* Now recompute all bit lengths, scanning in increasing frequency.
-   * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
-   * lengths instead of fixing only the wrong ones. This idea is taken
-   * from 'ar' written by Haruhiko Okumura.)
-   */
-  for (bits = max_length; bits !== 0; bits--) {
-    n = s.bl_count[bits];
-    while (n !== 0) {
-      m = s.heap[--h];
-      if (m > max_code) { continue; }
-      if (tree[m * 2 + 1]/*.Len*/ !== bits) {
-        // Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
-        s.opt_len += (bits - tree[m * 2 + 1]/*.Len*/) * tree[m * 2]/*.Freq*/;
-        tree[m * 2 + 1]/*.Len*/ = bits;
+        dodist:
+        for (;;) { // goto emulation
+          op = here >>> 24/*here.bits*/;
+          hold >>>= op;
+          bits -= op;
+          op = (here >>> 16) & 0xff/*here.op*/;
+
+          if (op & 16) {                      /* distance base */
+            dist = here & 0xffff/*here.val*/;
+            op &= 15;                       /* number of extra bits */
+            if (bits < op) {
+              hold += input[_in++] << bits;
+              bits += 8;
+              if (bits < op) {
+                hold += input[_in++] << bits;
+                bits += 8;
+              }
+            }
+            dist += hold & ((1 << op) - 1);
+//#ifdef INFLATE_STRICT
+            if (dist > dmax) {
+              strm.msg = 'invalid distance too far back';
+              state.mode = BAD;
+              break top;
+            }
+//#endif
+            hold >>>= op;
+            bits -= op;
+            //Tracevv((stderr, "inflate:         distance %u\n", dist));
+            op = _out - beg;                /* max distance in output */
+            if (dist > op) {                /* see if copy from window */
+              op = dist - op;               /* distance back in window */
+              if (op > whave) {
+                if (state.sane) {
+                  strm.msg = 'invalid distance too far back';
+                  state.mode = BAD;
+                  break top;
+                }
+
+// (!) This block is disabled in zlib defailts,
+// don't enable it for binary compatibility
+//#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+//                if (len <= op - whave) {
+//                  do {
+//                    output[_out++] = 0;
+//                  } while (--len);
+//                  continue top;
+//                }
+//                len -= op - whave;
+//                do {
+//                  output[_out++] = 0;
+//                } while (--op > whave);
+//                if (op === 0) {
+//                  from = _out - dist;
+//                  do {
+//                    output[_out++] = output[from++];
+//                  } while (--len);
+//                  continue top;
+//                }
+//#endif
+              }
+              from = 0; // window index
+              from_source = s_window;
+              if (wnext === 0) {           /* very common case */
+                from += wsize - op;
+                if (op < len) {         /* some from window */
+                  len -= op;
+                  do {
+                    output[_out++] = s_window[from++];
+                  } while (--op);
+                  from = _out - dist;  /* rest from output */
+                  from_source = output;
+                }
+              }
+              else if (wnext < op) {      /* wrap around window */
+                from += wsize + wnext - op;
+                op -= wnext;
+                if (op < len) {         /* some from end of window */
+                  len -= op;
+                  do {
+                    output[_out++] = s_window[from++];
+                  } while (--op);
+                  from = 0;
+                  if (wnext < len) {  /* some from start of window */
+                    op = wnext;
+                    len -= op;
+                    do {
+                      output[_out++] = s_window[from++];
+                    } while (--op);
+                    from = _out - dist;      /* rest from output */
+                    from_source = output;
+                  }
+                }
+              }
+              else {                      /* contiguous in window */
+                from += wnext - op;
+                if (op < len) {         /* some from window */
+                  len -= op;
+                  do {
+                    output[_out++] = s_window[from++];
+                  } while (--op);
+                  from = _out - dist;  /* rest from output */
+                  from_source = output;
+                }
+              }
+              while (len > 2) {
+                output[_out++] = from_source[from++];
+                output[_out++] = from_source[from++];
+                output[_out++] = from_source[from++];
+                len -= 3;
+              }
+              if (len) {
+                output[_out++] = from_source[from++];
+                if (len > 1) {
+                  output[_out++] = from_source[from++];
+                }
+              }
+            }
+            else {
+              from = _out - dist;          /* copy direct from output */
+              do {                        /* minimum length is three */
+                output[_out++] = output[from++];
+                output[_out++] = output[from++];
+                output[_out++] = output[from++];
+                len -= 3;
+              } while (len > 2);
+              if (len) {
+                output[_out++] = output[from++];
+                if (len > 1) {
+                  output[_out++] = output[from++];
+                }
+              }
+            }
+          }
+          else if ((op & 64) === 0) {          /* 2nd level distance code */
+            here = dcode[(here & 0xffff)/*here.val*/ + (hold & ((1 << op) - 1))];
+            continue dodist;
+          }
+          else {
+            strm.msg = 'invalid distance code';
+            state.mode = BAD;
+            break top;
+          }
+
+          break; // need to emulate goto via "continue"
+        }
       }
-      n--;
+      else if ((op & 64) === 0) {              /* 2nd level length code */
+        here = lcode[(here & 0xffff)/*here.val*/ + (hold & ((1 << op) - 1))];
+        continue dolen;
+      }
+      else if (op & 32) {                     /* end-of-block */
+        //Tracevv((stderr, "inflate:         end of block\n"));
+        state.mode = TYPE;
+        break top;
+      }
+      else {
+        strm.msg = 'invalid literal/length code';
+        state.mode = BAD;
+        break top;
+      }
+
+      break; // need to emulate goto via "continue"
     }
-  }
-}
+  } while (_in < last && _out < end);
 
+  /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
+  len = bits >> 3;
+  _in -= len;
+  bits -= len << 3;
+  hold &= (1 << bits) - 1;
 
-/* ===========================================================================
- * Generate the codes for a given tree and bit counts (which need not be
- * optimal).
- * IN assertion: the array bl_count contains the bit length statistics for
- * the given tree and the field len is set for all tree elements.
- * OUT assertion: the field code is set for all tree elements of non
- *     zero code length.
- */
-function gen_codes(tree, max_code, bl_count)
-//    ct_data *tree;             /* the tree to decorate */
-//    int max_code;              /* largest code with non zero frequency */
-//    ushf *bl_count;            /* number of codes at each bit length */
-{
-  var next_code = new Array(MAX_BITS + 1); /* next code value for each bit length */
-  var code = 0;              /* running code value */
-  var bits;                  /* bit index */
-  var n;                     /* code index */
+  /* update state and return */
+  strm.next_in = _in;
+  strm.next_out = _out;
+  strm.avail_in = (_in < last ? 5 + (last - _in) : 5 - (_in - last));
+  strm.avail_out = (_out < end ? 257 + (end - _out) : 257 - (_out - end));
+  state.hold = hold;
+  state.bits = bits;
+  return;
+};
 
-  /* The distribution counts are first used to generate the code values
-   * without bit reversal.
-   */
-  for (bits = 1; bits <= MAX_BITS; bits++) {
-    next_code[bits] = code = (code + bl_count[bits - 1]) << 1;
-  }
-  /* Check that the bit counts in bl_count are consistent. The last code
-   * must be all ones.
-   */
-  //Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
-  //        "inconsistent bit counts");
-  //Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
+},{}],175:[function(_dereq_,module,exports){
+'use strict';
 
-  for (n = 0;  n <= max_code; n++) {
-    var len = tree[n * 2 + 1]/*.Len*/;
-    if (len === 0) { continue; }
-    /* Now reverse the bits */
-    tree[n * 2]/*.Code*/ = bi_reverse(next_code[len]++, len);
 
-    //Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
-    //     n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
-  }
-}
+var utils         = _dereq_('../utils/common');
+var adler32       = _dereq_('./adler32');
+var crc32         = _dereq_('./crc32');
+var inflate_fast  = _dereq_('./inffast');
+var inflate_table = _dereq_('./inftrees');
+
+var CODES = 0;
+var LENS = 1;
+var DISTS = 2;
+
+/* Public constants ==========================================================*/
+/* ===========================================================================*/
 
 
-/* ===========================================================================
- * Initialize the various 'constant' tables.
+/* Allowed flush values; see deflate() and inflate() below for details */
+//var Z_NO_FLUSH      = 0;
+//var Z_PARTIAL_FLUSH = 1;
+//var Z_SYNC_FLUSH    = 2;
+//var Z_FULL_FLUSH    = 3;
+var Z_FINISH        = 4;
+var Z_BLOCK         = 5;
+var Z_TREES         = 6;
+
+
+/* Return codes for the compression/decompression functions. Negative values
+ * are errors, positive values are used for special but normal events.
  */
-function tr_static_init() {
-  var n;        /* iterates over tree elements */
-  var bits;     /* bit counter */
-  var length;   /* length value */
-  var code;     /* code value */
-  var dist;     /* distance index */
-  var bl_count = new Array(MAX_BITS + 1);
-  /* number of codes at each bit length for an optimal tree */
+var Z_OK            = 0;
+var Z_STREAM_END    = 1;
+var Z_NEED_DICT     = 2;
+//var Z_ERRNO         = -1;
+var Z_STREAM_ERROR  = -2;
+var Z_DATA_ERROR    = -3;
+var Z_MEM_ERROR     = -4;
+var Z_BUF_ERROR     = -5;
+//var Z_VERSION_ERROR = -6;
 
-  // do check in _tr_init()
-  //if (static_init_done) return;
+/* The deflate compression method */
+var Z_DEFLATED  = 8;
 
-  /* For some embedded targets, global variables are not initialized: */
-/*#ifdef NO_INIT_GLOBAL_POINTERS
-  static_l_desc.static_tree = static_ltree;
-  static_l_desc.extra_bits = extra_lbits;
-  static_d_desc.static_tree = static_dtree;
-  static_d_desc.extra_bits = extra_dbits;
-  static_bl_desc.extra_bits = extra_blbits;
-#endif*/
 
-  /* Initialize the mapping length (0..255) -> length code (0..28) */
-  length = 0;
-  for (code = 0; code < LENGTH_CODES - 1; code++) {
-    base_length[code] = length;
-    for (n = 0; n < (1 << extra_lbits[code]); n++) {
-      _length_code[length++] = code;
-    }
-  }
-  //Assert (length == 256, "tr_static_init: length != 256");
-  /* Note that the length 255 (match length 258) can be represented
-   * in two different ways: code 284 + 5 bits or code 285, so we
-   * overwrite length_code[255] to use the best encoding:
-   */
-  _length_code[length - 1] = code;
+/* STATES ====================================================================*/
+/* ===========================================================================*/
 
-  /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
-  dist = 0;
-  for (code = 0; code < 16; code++) {
-    base_dist[code] = dist;
-    for (n = 0; n < (1 << extra_dbits[code]); n++) {
-      _dist_code[dist++] = code;
-    }
-  }
-  //Assert (dist == 256, "tr_static_init: dist != 256");
-  dist >>= 7; /* from now on, all distances are divided by 128 */
-  for (; code < D_CODES; code++) {
-    base_dist[code] = dist << 7;
-    for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {
-      _dist_code[256 + dist++] = code;
-    }
-  }
-  //Assert (dist == 256, "tr_static_init: 256+dist != 512");
-
-  /* Construct the codes of the static literal tree */
-  for (bits = 0; bits <= MAX_BITS; bits++) {
-    bl_count[bits] = 0;
-  }
-
-  n = 0;
-  while (n <= 143) {
-    static_ltree[n * 2 + 1]/*.Len*/ = 8;
-    n++;
-    bl_count[8]++;
-  }
-  while (n <= 255) {
-    static_ltree[n * 2 + 1]/*.Len*/ = 9;
-    n++;
-    bl_count[9]++;
-  }
-  while (n <= 279) {
-    static_ltree[n * 2 + 1]/*.Len*/ = 7;
-    n++;
-    bl_count[7]++;
-  }
-  while (n <= 287) {
-    static_ltree[n * 2 + 1]/*.Len*/ = 8;
-    n++;
-    bl_count[8]++;
-  }
-  /* Codes 286 and 287 do not exist, but we must include them in the
-   * tree construction to get a canonical Huffman tree (longest code
-   * all ones)
-   */
-  gen_codes(static_ltree, L_CODES + 1, bl_count);
-
-  /* The static distance tree is trivial: */
-  for (n = 0; n < D_CODES; n++) {
-    static_dtree[n * 2 + 1]/*.Len*/ = 5;
-    static_dtree[n * 2]/*.Code*/ = bi_reverse(n, 5);
-  }
-
-  // Now data ready and we can init static trees
-  static_l_desc = new StaticTreeDesc(static_ltree, extra_lbits, LITERALS + 1, L_CODES, MAX_BITS);
-  static_d_desc = new StaticTreeDesc(static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS);
-  static_bl_desc = new StaticTreeDesc(new Array(0), extra_blbits, 0,         BL_CODES, MAX_BL_BITS);
-
-  //static_init_done = true;
-}
 
+var    HEAD = 1;       /* i: waiting for magic header */
+var    FLAGS = 2;      /* i: waiting for method and flags (gzip) */
+var    TIME = 3;       /* i: waiting for modification time (gzip) */
+var    OS = 4;         /* i: waiting for extra flags and operating system (gzip) */
+var    EXLEN = 5;      /* i: waiting for extra length (gzip) */
+var    EXTRA = 6;      /* i: waiting for extra bytes (gzip) */
+var    NAME = 7;       /* i: waiting for end of file name (gzip) */
+var    COMMENT = 8;    /* i: waiting for end of comment (gzip) */
+var    HCRC = 9;       /* i: waiting for header crc (gzip) */
+var    DICTID = 10;    /* i: waiting for dictionary check value */
+var    DICT = 11;      /* waiting for inflateSetDictionary() call */
+var        TYPE = 12;      /* i: waiting for type bits, including last-flag bit */
+var        TYPEDO = 13;    /* i: same, but skip check to exit inflate on new block */
+var        STORED = 14;    /* i: waiting for stored size (length and complement) */
+var        COPY_ = 15;     /* i/o: same as COPY below, but only first time in */
+var        COPY = 16;      /* i/o: waiting for input or output to copy stored block */
+var        TABLE = 17;     /* i: waiting for dynamic block table lengths */
+var        LENLENS = 18;   /* i: waiting for code length code lengths */
+var        CODELENS = 19;  /* i: waiting for length/lit and distance code lengths */
+var            LEN_ = 20;      /* i: same as LEN below, but only first time in */
+var            LEN = 21;       /* i: waiting for length/lit/eob code */
+var            LENEXT = 22;    /* i: waiting for length extra bits */
+var            DIST = 23;      /* i: waiting for distance code */
+var            DISTEXT = 24;   /* i: waiting for distance extra bits */
+var            MATCH = 25;     /* o: waiting for output space to copy string */
+var            LIT = 26;       /* o: waiting for output space to write literal */
+var    CHECK = 27;     /* i: waiting for 32-bit check value */
+var    LENGTH = 28;    /* i: waiting for 32-bit length (gzip) */
+var    DONE = 29;      /* finished check, done -- remain here until reset */
+var    BAD = 30;       /* got a data error -- remain here until reset */
+var    MEM = 31;       /* got an inflate() memory error -- remain here until reset */
+var    SYNC = 32;      /* looking for synchronization bytes to restart inflate() */
 
-/* ===========================================================================
- * Initialize a new block.
- */
-function init_block(s) {
-  var n; /* iterates over tree elements */
+/* ===========================================================================*/
 
-  /* Initialize the trees. */
-  for (n = 0; n < L_CODES;  n++) { s.dyn_ltree[n * 2]/*.Freq*/ = 0; }
-  for (n = 0; n < D_CODES;  n++) { s.dyn_dtree[n * 2]/*.Freq*/ = 0; }
-  for (n = 0; n < BL_CODES; n++) { s.bl_tree[n * 2]/*.Freq*/ = 0; }
 
-  s.dyn_ltree[END_BLOCK * 2]/*.Freq*/ = 1;
-  s.opt_len = s.static_len = 0;
-  s.last_lit = s.matches = 0;
-}
 
+var ENOUGH_LENS = 852;
+var ENOUGH_DISTS = 592;
+//var ENOUGH =  (ENOUGH_LENS+ENOUGH_DISTS);
 
-/* ===========================================================================
- * Flush the bit buffer and align the output on a byte boundary
- */
-function bi_windup(s)
-{
-  if (s.bi_valid > 8) {
-    put_short(s, s.bi_buf);
-  } else if (s.bi_valid > 0) {
-    //put_byte(s, (Byte)s->bi_buf);
-    s.pending_buf[s.pending++] = s.bi_buf;
-  }
-  s.bi_buf = 0;
-  s.bi_valid = 0;
-}
+var MAX_WBITS = 15;
+/* 32K LZ77 window */
+var DEF_WBITS = MAX_WBITS;
 
-/* ===========================================================================
- * Copy a stored block, storing first the length and its
- * one's complement if requested.
- */
-function copy_block(s, buf, len, header)
-//DeflateState *s;
-//charf    *buf;    /* the input data */
-//unsigned len;     /* its length */
-//int      header;  /* true if block header must be written */
-{
-  bi_windup(s);        /* align on byte boundary */
 
-  if (header) {
-    put_short(s, len);
-    put_short(s, ~len);
-  }
-//  while (len--) {
-//    put_byte(s, *buf++);
-//  }
-  utils.arraySet(s.pending_buf, s.window, buf, len, s.pending);
-  s.pending += len;
+function zswap32(q) {
+  return  (((q >>> 24) & 0xff) +
+          ((q >>> 8) & 0xff00) +
+          ((q & 0xff00) << 8) +
+          ((q & 0xff) << 24));
 }
 
-/* ===========================================================================
- * Compares to subtrees, using the tree depth as tie breaker when
- * the subtrees have equal frequency. This minimizes the worst case length.
- */
-function smaller(tree, n, m, depth) {
-  var _n2 = n * 2;
-  var _m2 = m * 2;
-  return (tree[_n2]/*.Freq*/ < tree[_m2]/*.Freq*/ ||
-         (tree[_n2]/*.Freq*/ === tree[_m2]/*.Freq*/ && depth[n] <= depth[m]));
-}
 
-/* ===========================================================================
- * Restore the heap property by moving down the tree starting at node k,
- * exchanging a node with the smallest of its two sons if necessary, stopping
- * when the heap property is re-established (each father smaller than its
- * two sons).
- */
-function pqdownheap(s, tree, k)
-//    deflate_state *s;
-//    ct_data *tree;  /* the tree to restore */
-//    int k;               /* node to move down */
-{
-  var v = s.heap[k];
-  var j = k << 1;  /* left son of k */
-  while (j <= s.heap_len) {
-    /* Set j to the smallest of the two sons: */
-    if (j < s.heap_len &&
-      smaller(tree, s.heap[j + 1], s.heap[j], s.depth)) {
-      j++;
-    }
-    /* Exit if v is smaller than both sons */
-    if (smaller(tree, v, s.heap[j], s.depth)) { break; }
+function InflateState() {
+  this.mode = 0;             /* current inflate mode */
+  this.last = false;          /* true if processing last block */
+  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */
+  this.havedict = false;      /* true if dictionary provided */
+  this.flags = 0;             /* gzip header method and flags (0 if zlib) */
+  this.dmax = 0;              /* zlib header max distance (INFLATE_STRICT) */
+  this.check = 0;             /* protected copy of check value */
+  this.total = 0;             /* protected copy of output count */
+  // TODO: may be {}
+  this.head = null;           /* where to save gzip header information */
 
-    /* Exchange v with the smallest son */
-    s.heap[k] = s.heap[j];
-    k = j;
+  /* sliding window */
+  this.wbits = 0;             /* log base 2 of requested window size */
+  this.wsize = 0;             /* window size or zero if not using window */
+  this.whave = 0;             /* valid bytes in the window */
+  this.wnext = 0;             /* window write index */
+  this.window = null;         /* allocated sliding window, if needed */
 
-    /* And continue down the tree, setting j to the left son of k */
-    j <<= 1;
-  }
-  s.heap[k] = v;
-}
+  /* bit accumulator */
+  this.hold = 0;              /* input bit accumulator */
+  this.bits = 0;              /* number of bits in "in" */
 
+  /* for string and stored block copying */
+  this.length = 0;            /* literal or length of data to copy */
+  this.offset = 0;            /* distance back to copy string from */
 
-// inlined manually
-// var SMALLEST = 1;
+  /* for table and code decoding */
+  this.extra = 0;             /* extra bits needed */
 
-/* ===========================================================================
- * Send the block data compressed using the given Huffman trees
- */
-function compress_block(s, ltree, dtree)
-//    deflate_state *s;
-//    const ct_data *ltree; /* literal tree */
-//    const ct_data *dtree; /* distance tree */
-{
-  var dist;           /* distance of matched string */
-  var lc;             /* match length or unmatched char (if dist == 0) */
-  var lx = 0;         /* running index in l_buf */
-  var code;           /* the code to send */
-  var extra;          /* number of extra bits to send */
+  /* fixed and dynamic code tables */
+  this.lencode = null;          /* starting table for length/literal codes */
+  this.distcode = null;         /* starting table for distance codes */
+  this.lenbits = 0;           /* index bits for lencode */
+  this.distbits = 0;          /* index bits for distcode */
 
-  if (s.last_lit !== 0) {
-    do {
-      dist = (s.pending_buf[s.d_buf + lx * 2] << 8) | (s.pending_buf[s.d_buf + lx * 2 + 1]);
-      lc = s.pending_buf[s.l_buf + lx];
-      lx++;
+  /* dynamic table building */
+  this.ncode = 0;             /* number of code length code lengths */
+  this.nlen = 0;              /* number of length code lengths */
+  this.ndist = 0;             /* number of distance code lengths */
+  this.have = 0;              /* number of code lengths in lens[] */
+  this.next = null;              /* next available space in codes[] */
 
-      if (dist === 0) {
-        send_code(s, lc, ltree); /* send a literal byte */
-        //Tracecv(isgraph(lc), (stderr," '%c' ", lc));
-      } else {
-        /* Here, lc is the match length - MIN_MATCH */
-        code = _length_code[lc];
-        send_code(s, code + LITERALS + 1, ltree); /* send the length code */
-        extra = extra_lbits[code];
-        if (extra !== 0) {
-          lc -= base_length[code];
-          send_bits(s, lc, extra);       /* send the extra length bits */
-        }
-        dist--; /* dist is now the match distance - 1 */
-        code = d_code(dist);
-        //Assert (code < D_CODES, "bad d_code");
+  this.lens = new utils.Buf16(320); /* temporary storage for code lengths */
+  this.work = new utils.Buf16(288); /* work area for code table building */
 
-        send_code(s, code, dtree);       /* send the distance code */
-        extra = extra_dbits[code];
-        if (extra !== 0) {
-          dist -= base_dist[code];
-          send_bits(s, dist, extra);   /* send the extra distance bits */
-        }
-      } /* literal or match pair ? */
+  /*
+   because we don't have pointers in js, we use lencode and distcode directly
+   as buffers so we don't need codes
+  */
+  //this.codes = new utils.Buf32(ENOUGH);       /* space for code tables */
+  this.lendyn = null;              /* dynamic table for length/literal codes (JS specific) */
+  this.distdyn = null;             /* dynamic table for distance codes (JS specific) */
+  this.sane = 0;                   /* if false, allow invalid distance too far */
+  this.back = 0;                   /* bits back of last unprocessed length/lit */
+  this.was = 0;                    /* initial length of match */
+}
 
-      /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
-      //Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
-      //       "pendingBuf overflow");
+function inflateResetKeep(strm) {
+  var state;
 
-    } while (lx < s.last_lit);
+  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
+  state = strm.state;
+  strm.total_in = strm.total_out = state.total = 0;
+  strm.msg = ''; /*Z_NULL*/
+  if (state.wrap) {       /* to support ill-conceived Java test suite */
+    strm.adler = state.wrap & 1;
   }
+  state.mode = HEAD;
+  state.last = 0;
+  state.havedict = 0;
+  state.dmax = 32768;
+  state.head = null/*Z_NULL*/;
+  state.hold = 0;
+  state.bits = 0;
+  //state.lencode = state.distcode = state.next = state.codes;
+  state.lencode = state.lendyn = new utils.Buf32(ENOUGH_LENS);
+  state.distcode = state.distdyn = new utils.Buf32(ENOUGH_DISTS);
 
-  send_code(s, END_BLOCK, ltree);
+  state.sane = 1;
+  state.back = -1;
+  //Tracev((stderr, "inflate: reset\n"));
+  return Z_OK;
 }
 
+function inflateReset(strm) {
+  var state;
 
-/* ===========================================================================
- * Construct one Huffman tree and assigns the code bit strings and lengths.
- * Update the total bit length for the current block.
- * IN assertion: the field freq is set for all tree elements.
- * OUT assertions: the fields len and code are set to the optimal bit length
- *     and corresponding code. The length opt_len is updated; static_len is
- *     also updated if stree is not null. The field max_code is set.
- */
-function build_tree(s, desc)
-//    deflate_state *s;
-//    tree_desc *desc; /* the tree descriptor */
-{
-  var tree     = desc.dyn_tree;
-  var stree    = desc.stat_desc.static_tree;
-  var has_stree = desc.stat_desc.has_stree;
-  var elems    = desc.stat_desc.elems;
-  var n, m;          /* iterate over heap elements */
-  var max_code = -1; /* largest code with non zero frequency */
-  var node;          /* new node being created */
-
-  /* Construct the initial heap, with least frequent element in
-   * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
-   * heap[0] is not used.
-   */
-  s.heap_len = 0;
-  s.heap_max = HEAP_SIZE;
+  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
+  state = strm.state;
+  state.wsize = 0;
+  state.whave = 0;
+  state.wnext = 0;
+  return inflateResetKeep(strm);
 
-  for (n = 0; n < elems; n++) {
-    if (tree[n * 2]/*.Freq*/ !== 0) {
-      s.heap[++s.heap_len] = max_code = n;
-      s.depth[n] = 0;
+}
 
-    } else {
-      tree[n * 2 + 1]/*.Len*/ = 0;
-    }
-  }
+function inflateReset2(strm, windowBits) {
+  var wrap;
+  var state;
 
-  /* The pkzip format requires that at least one distance code exists,
-   * and that at least one bit should be sent even if there is only one
-   * possible code. So to avoid special checks later on we force at least
-   * two codes of non zero frequency.
-   */
-  while (s.heap_len < 2) {
-    node = s.heap[++s.heap_len] = (max_code < 2 ? ++max_code : 0);
-    tree[node * 2]/*.Freq*/ = 1;
-    s.depth[node] = 0;
-    s.opt_len--;
+  /* get the state */
+  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
+  state = strm.state;
 
-    if (has_stree) {
-      s.static_len -= stree[node * 2 + 1]/*.Len*/;
+  /* extract wrap request from windowBits parameter */
+  if (windowBits < 0) {
+    wrap = 0;
+    windowBits = -windowBits;
+  }
+  else {
+    wrap = (windowBits >> 4) + 1;
+    if (windowBits < 48) {
+      windowBits &= 15;
     }
-    /* node is 0 or 1 so it does not have extra bits */
   }
-  desc.max_code = max_code;
-
-  /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
-   * establish sub-heaps of increasing lengths:
-   */
-  for (n = (s.heap_len >> 1/*int /2*/); n >= 1; n--) { pqdownheap(s, tree, n); }
-
-  /* Construct the Huffman tree by repeatedly combining the least two
-   * frequent nodes.
-   */
-  node = elems;              /* next internal node of the tree */
-  do {
-    //pqremove(s, tree, n);  /* n = node of least frequency */
-    /*** pqremove ***/
-    n = s.heap[1/*SMALLEST*/];
-    s.heap[1/*SMALLEST*/] = s.heap[s.heap_len--];
-    pqdownheap(s, tree, 1/*SMALLEST*/);
-    /***/
 
-    m = s.heap[1/*SMALLEST*/]; /* m = node of next least frequency */
-
-    s.heap[--s.heap_max] = n; /* keep the nodes sorted by frequency */
-    s.heap[--s.heap_max] = m;
+  /* set number of window bits, free window if different */
+  if (windowBits && (windowBits < 8 || windowBits > 15)) {
+    return Z_STREAM_ERROR;
+  }
+  if (state.window !== null && state.wbits !== windowBits) {
+    state.window = null;
+  }
 
-    /* Create a new node father of n and m */
-    tree[node * 2]/*.Freq*/ = tree[n * 2]/*.Freq*/ + tree[m * 2]/*.Freq*/;
-    s.depth[node] = (s.depth[n] >= s.depth[m] ? s.depth[n] : s.depth[m]) + 1;
-    tree[n * 2 + 1]/*.Dad*/ = tree[m * 2 + 1]/*.Dad*/ = node;
+  /* update state and reset the rest of it */
+  state.wrap = wrap;
+  state.wbits = windowBits;
+  return inflateReset(strm);
+}
 
-    /* and insert the new node in the heap */
-    s.heap[1/*SMALLEST*/] = node++;
-    pqdownheap(s, tree, 1/*SMALLEST*/);
+function inflateInit2(strm, windowBits) {
+  var ret;
+  var state;
 
-  } while (s.heap_len >= 2);
+  if (!strm) { return Z_STREAM_ERROR; }
+  //strm.msg = Z_NULL;                 /* in case we return an error */
 
-  s.heap[--s.heap_max] = s.heap[1/*SMALLEST*/];
+  state = new InflateState();
 
-  /* At this point, the fields freq and dad are set. We can now
-   * generate the bit lengths.
-   */
-  gen_bitlen(s, desc);
+  //if (state === Z_NULL) return Z_MEM_ERROR;
+  //Tracev((stderr, "inflate: allocated\n"));
+  strm.state = state;
+  state.window = null/*Z_NULL*/;
+  ret = inflateReset2(strm, windowBits);
+  if (ret !== Z_OK) {
+    strm.state = null/*Z_NULL*/;
+  }
+  return ret;
+}
 
-  /* The field len is now set, we can generate the bit codes */
-  gen_codes(tree, max_code, s.bl_count);
+function inflateInit(strm) {
+  return inflateInit2(strm, DEF_WBITS);
 }
 
 
-/* ===========================================================================
- * Scan a literal or distance tree to determine the frequencies of the codes
- * in the bit length tree.
+/*
+ Return state with length and distance decoding tables and index sizes set to
+ fixed code decoding.  Normally this returns fixed tables from inffixed.h.
+ If BUILDFIXED is defined, then instead this routine builds the tables the
+ first time it's called, and returns those tables the first time and
+ thereafter.  This reduces the size of the code by about 2K bytes, in
+ exchange for a little execution time.  However, BUILDFIXED should not be
+ used for threaded applications, since the rewriting of the tables and virgin
+ may not be thread-safe.
  */
-function scan_tree(s, tree, max_code)
-//    deflate_state *s;
-//    ct_data *tree;   /* the tree to be scanned */
-//    int max_code;    /* and its largest code of non zero frequency */
-{
-  var n;                     /* iterates over all tree elements */
-  var prevlen = -1;          /* last emitted length */
-  var curlen;                /* length of current code */
+var virgin = true;
 
-  var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */
+var lenfix, distfix; // We have no pointers in JS, so keep tables separate
 
-  var count = 0;             /* repeat count of the current code */
-  var max_count = 7;         /* max repeat count */
-  var min_count = 4;         /* min repeat count */
+function fixedtables(state) {
+  /* build fixed huffman tables if first call (may not be thread safe) */
+  if (virgin) {
+    var sym;
 
-  if (nextlen === 0) {
-    max_count = 138;
-    min_count = 3;
-  }
-  tree[(max_code + 1) * 2 + 1]/*.Len*/ = 0xffff; /* guard */
+    lenfix = new utils.Buf32(512);
+    distfix = new utils.Buf32(32);
 
-  for (n = 0; n <= max_code; n++) {
-    curlen = nextlen;
-    nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;
+    /* literal/length table */
+    sym = 0;
+    while (sym < 144) { state.lens[sym++] = 8; }
+    while (sym < 256) { state.lens[sym++] = 9; }
+    while (sym < 280) { state.lens[sym++] = 7; }
+    while (sym < 288) { state.lens[sym++] = 8; }
 
-    if (++count < max_count && curlen === nextlen) {
-      continue;
+    inflate_table(LENS,  state.lens, 0, 288, lenfix,   0, state.work, { bits: 9 });
 
-    } else if (count < min_count) {
-      s.bl_tree[curlen * 2]/*.Freq*/ += count;
+    /* distance table */
+    sym = 0;
+    while (sym < 32) { state.lens[sym++] = 5; }
 
-    } else if (curlen !== 0) {
+    inflate_table(DISTS, state.lens, 0, 32,   distfix, 0, state.work, { bits: 5 });
 
-      if (curlen !== prevlen) { s.bl_tree[curlen * 2]/*.Freq*/++; }
-      s.bl_tree[REP_3_6 * 2]/*.Freq*/++;
+    /* do this just once */
+    virgin = false;
+  }
 
-    } else if (count <= 10) {
-      s.bl_tree[REPZ_3_10 * 2]/*.Freq*/++;
+  state.lencode = lenfix;
+  state.lenbits = 9;
+  state.distcode = distfix;
+  state.distbits = 5;
+}
 
-    } else {
-      s.bl_tree[REPZ_11_138 * 2]/*.Freq*/++;
+
+/*
+ Update the window with the last wsize (normally 32K) bytes written before
+ returning.  If window does not exist yet, create it.  This is only called
+ when a window is already in use, or when output has been written during this
+ inflate call, but the end of the deflate stream has not been reached yet.
+ It is also called to create a window for dictionary data when a dictionary
+ is loaded.
+
+ Providing output buffers larger than 32K to inflate() should provide a speed
+ advantage, since only the last 32K of output is copied to the sliding window
+ upon return from inflate(), and since all distances after the first 32K of
+ output will fall in the output data, making match copies simpler and faster.
+ The advantage may be dependent on the size of the processor's data caches.
+ */
+function updatewindow(strm, src, end, copy) {
+  var dist;
+  var state = strm.state;
+
+  /* if it hasn't been done already, allocate space for the window */
+  if (state.window === null) {
+    state.wsize = 1 << state.wbits;
+    state.wnext = 0;
+    state.whave = 0;
+
+    state.window = new utils.Buf8(state.wsize);
+  }
+
+  /* copy state->wsize or less output bytes into the circular window */
+  if (copy >= state.wsize) {
+    utils.arraySet(state.window, src, end - state.wsize, state.wsize, 0);
+    state.wnext = 0;
+    state.whave = state.wsize;
+  }
+  else {
+    dist = state.wsize - state.wnext;
+    if (dist > copy) {
+      dist = copy;
+    }
+    //zmemcpy(state->window + state->wnext, end - copy, dist);
+    utils.arraySet(state.window, src, end - copy, dist, state.wnext);
+    copy -= dist;
+    if (copy) {
+      //zmemcpy(state->window, end - copy, copy);
+      utils.arraySet(state.window, src, end - copy, copy, 0);
+      state.wnext = copy;
+      state.whave = state.wsize;
+    }
+    else {
+      state.wnext += dist;
+      if (state.wnext === state.wsize) { state.wnext = 0; }
+      if (state.whave < state.wsize) { state.whave += dist; }
     }
+  }
+  return 0;
+}
 
-    count = 0;
-    prevlen = curlen;
+function inflate(strm, flush) {
+  var state;
+  var input, output;          // input/output buffers
+  var next;                   /* next input INDEX */
+  var put;                    /* next output INDEX */
+  var have, left;             /* available input and output */
+  var hold;                   /* bit buffer */
+  var bits;                   /* bits in bit buffer */
+  var _in, _out;              /* save starting available input and output */
+  var copy;                   /* number of stored or match bytes to copy */
+  var from;                   /* where to copy match bytes from */
+  var from_source;
+  var here = 0;               /* current decoding table entry */
+  var here_bits, here_op, here_val; // paked "here" denormalized (JS specific)
+  //var last;                   /* parent table entry */
+  var last_bits, last_op, last_val; // paked "last" denormalized (JS specific)
+  var len;                    /* length to copy for repeats, bits to drop */
+  var ret;                    /* return code */
+  var hbuf = new utils.Buf8(4);    /* buffer for gzip header crc calculation */
+  var opts;
 
-    if (nextlen === 0) {
-      max_count = 138;
-      min_count = 3;
+  var n; // temporary var for NEED_BITS
+
+  var order = /* permutation of code lengths */
+    [ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ];
+
+
+  if (!strm || !strm.state || !strm.output ||
+      (!strm.input && strm.avail_in !== 0)) {
+    return Z_STREAM_ERROR;
+  }
+
+  state = strm.state;
+  if (state.mode === TYPE) { state.mode = TYPEDO; }    /* skip check */
+
+
+  //--- LOAD() ---
+  put = strm.next_out;
+  output = strm.output;
+  left = strm.avail_out;
+  next = strm.next_in;
+  input = strm.input;
+  have = strm.avail_in;
+  hold = state.hold;
+  bits = state.bits;
+  //---
+
+  _in = have;
+  _out = left;
+  ret = Z_OK;
+
+  inf_leave: // goto emulation
+  for (;;) {
+    switch (state.mode) {
+    case HEAD:
+      if (state.wrap === 0) {
+        state.mode = TYPEDO;
+        break;
+      }
+      //=== NEEDBITS(16);
+      while (bits < 16) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      if ((state.wrap & 2) && hold === 0x8b1f) {  /* gzip header */
+        state.check = 0/*crc32(0L, Z_NULL, 0)*/;
+        //=== CRC2(state.check, hold);
+        hbuf[0] = hold & 0xff;
+        hbuf[1] = (hold >>> 8) & 0xff;
+        state.check = crc32(state.check, hbuf, 2, 0);
+        //===//
+
+        //=== INITBITS();
+        hold = 0;
+        bits = 0;
+        //===//
+        state.mode = FLAGS;
+        break;
+      }
+      state.flags = 0;           /* expect zlib header */
+      if (state.head) {
+        state.head.done = false;
+      }
+      if (!(state.wrap & 1) ||   /* check if zlib header allowed */
+        (((hold & 0xff)/*BITS(8)*/ << 8) + (hold >> 8)) % 31) {
+        strm.msg = 'incorrect header check';
+        state.mode = BAD;
+        break;
+      }
+      if ((hold & 0x0f)/*BITS(4)*/ !== Z_DEFLATED) {
+        strm.msg = 'unknown compression method';
+        state.mode = BAD;
+        break;
+      }
+      //--- DROPBITS(4) ---//
+      hold >>>= 4;
+      bits -= 4;
+      //---//
+      len = (hold & 0x0f)/*BITS(4)*/ + 8;
+      if (state.wbits === 0) {
+        state.wbits = len;
+      }
+      else if (len > state.wbits) {
+        strm.msg = 'invalid window size';
+        state.mode = BAD;
+        break;
+      }
+      state.dmax = 1 << len;
+      //Tracev((stderr, "inflate:   zlib header ok\n"));
+      strm.adler = state.check = 1/*adler32(0L, Z_NULL, 0)*/;
+      state.mode = hold & 0x200 ? DICTID : TYPE;
+      //=== INITBITS();
+      hold = 0;
+      bits = 0;
+      //===//
+      break;
+    case FLAGS:
+      //=== NEEDBITS(16); */
+      while (bits < 16) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      state.flags = hold;
+      if ((state.flags & 0xff) !== Z_DEFLATED) {
+        strm.msg = 'unknown compression method';
+        state.mode = BAD;
+        break;
+      }
+      if (state.flags & 0xe000) {
+        strm.msg = 'unknown header flags set';
+        state.mode = BAD;
+        break;
+      }
+      if (state.head) {
+        state.head.text = ((hold >> 8) & 1);
+      }
+      if (state.flags & 0x0200) {
+        //=== CRC2(state.check, hold);
+        hbuf[0] = hold & 0xff;
+        hbuf[1] = (hold >>> 8) & 0xff;
+        state.check = crc32(state.check, hbuf, 2, 0);
+        //===//
+      }
+      //=== INITBITS();
+      hold = 0;
+      bits = 0;
+      //===//
+      state.mode = TIME;
+      /* falls through */
+    case TIME:
+      //=== NEEDBITS(32); */
+      while (bits < 32) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      if (state.head) {
+        state.head.time = hold;
+      }
+      if (state.flags & 0x0200) {
+        //=== CRC4(state.check, hold)
+        hbuf[0] = hold & 0xff;
+        hbuf[1] = (hold >>> 8) & 0xff;
+        hbuf[2] = (hold >>> 16) & 0xff;
+        hbuf[3] = (hold >>> 24) & 0xff;
+        state.check = crc32(state.check, hbuf, 4, 0);
+        //===
+      }
+      //=== INITBITS();
+      hold = 0;
+      bits = 0;
+      //===//
+      state.mode = OS;
+      /* falls through */
+    case OS:
+      //=== NEEDBITS(16); */
+      while (bits < 16) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      if (state.head) {
+        state.head.xflags = (hold & 0xff);
+        state.head.os = (hold >> 8);
+      }
+      if (state.flags & 0x0200) {
+        //=== CRC2(state.check, hold);
+        hbuf[0] = hold & 0xff;
+        hbuf[1] = (hold >>> 8) & 0xff;
+        state.check = crc32(state.check, hbuf, 2, 0);
+        //===//
+      }
+      //=== INITBITS();
+      hold = 0;
+      bits = 0;
+      //===//
+      state.mode = EXLEN;
+      /* falls through */
+    case EXLEN:
+      if (state.flags & 0x0400) {
+        //=== NEEDBITS(16); */
+        while (bits < 16) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        state.length = hold;
+        if (state.head) {
+          state.head.extra_len = hold;
+        }
+        if (state.flags & 0x0200) {
+          //=== CRC2(state.check, hold);
+          hbuf[0] = hold & 0xff;
+          hbuf[1] = (hold >>> 8) & 0xff;
+          state.check = crc32(state.check, hbuf, 2, 0);
+          //===//
+        }
+        //=== INITBITS();
+        hold = 0;
+        bits = 0;
+        //===//
+      }
+      else if (state.head) {
+        state.head.extra = null/*Z_NULL*/;
+      }
+      state.mode = EXTRA;
+      /* falls through */
+    case EXTRA:
+      if (state.flags & 0x0400) {
+        copy = state.length;
+        if (copy > have) { copy = have; }
+        if (copy) {
+          if (state.head) {
+            len = state.head.extra_len - state.length;
+            if (!state.head.extra) {
+              // Use untyped array for more conveniend processing later
+              state.head.extra = new Array(state.head.extra_len);
+            }
+            utils.arraySet(
+              state.head.extra,
+              input,
+              next,
+              // extra field is limited to 65536 bytes
+              // - no need for additional size check
+              copy,
+              /*len + copy > state.head.extra_max - len ? state.head.extra_max : copy,*/
+              len
+            );
+            //zmemcpy(state.head.extra + len, next,
+            //        len + copy > state.head.extra_max ?
+            //        state.head.extra_max - len : copy);
+          }
+          if (state.flags & 0x0200) {
+            state.check = crc32(state.check, input, copy, next);
+          }
+          have -= copy;
+          next += copy;
+          state.length -= copy;
+        }
+        if (state.length) { break inf_leave; }
+      }
+      state.length = 0;
+      state.mode = NAME;
+      /* falls through */
+    case NAME:
+      if (state.flags & 0x0800) {
+        if (have === 0) { break inf_leave; }
+        copy = 0;
+        do {
+          // TODO: 2 or 1 bytes?
+          len = input[next + copy++];
+          /* use constant limit because in js we should not preallocate memory */
+          if (state.head && len &&
+              (state.length < 65536 /*state.head.name_max*/)) {
+            state.head.name += String.fromCharCode(len);
+          }
+        } while (len && copy < have);
+
+        if (state.flags & 0x0200) {
+          state.check = crc32(state.check, input, copy, next);
+        }
+        have -= copy;
+        next += copy;
+        if (len) { break inf_leave; }
+      }
+      else if (state.head) {
+        state.head.name = null;
+      }
+      state.length = 0;
+      state.mode = COMMENT;
+      /* falls through */
+    case COMMENT:
+      if (state.flags & 0x1000) {
+        if (have === 0) { break inf_leave; }
+        copy = 0;
+        do {
+          len = input[next + copy++];
+          /* use constant limit because in js we should not preallocate memory */
+          if (state.head && len &&
+              (state.length < 65536 /*state.head.comm_max*/)) {
+            state.head.comment += String.fromCharCode(len);
+          }
+        } while (len && copy < have);
+        if (state.flags & 0x0200) {
+          state.check = crc32(state.check, input, copy, next);
+        }
+        have -= copy;
+        next += copy;
+        if (len) { break inf_leave; }
+      }
+      else if (state.head) {
+        state.head.comment = null;
+      }
+      state.mode = HCRC;
+      /* falls through */
+    case HCRC:
+      if (state.flags & 0x0200) {
+        //=== NEEDBITS(16); */
+        while (bits < 16) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        if (hold !== (state.check & 0xffff)) {
+          strm.msg = 'header crc mismatch';
+          state.mode = BAD;
+          break;
+        }
+        //=== INITBITS();
+        hold = 0;
+        bits = 0;
+        //===//
+      }
+      if (state.head) {
+        state.head.hcrc = ((state.flags >> 9) & 1);
+        state.head.done = true;
+      }
+      strm.adler = state.check = 0;
+      state.mode = TYPE;
+      break;
+    case DICTID:
+      //=== NEEDBITS(32); */
+      while (bits < 32) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      strm.adler = state.check = zswap32(hold);
+      //=== INITBITS();
+      hold = 0;
+      bits = 0;
+      //===//
+      state.mode = DICT;
+      /* falls through */
+    case DICT:
+      if (state.havedict === 0) {
+        //--- RESTORE() ---
+        strm.next_out = put;
+        strm.avail_out = left;
+        strm.next_in = next;
+        strm.avail_in = have;
+        state.hold = hold;
+        state.bits = bits;
+        //---
+        return Z_NEED_DICT;
+      }
+      strm.adler = state.check = 1/*adler32(0L, Z_NULL, 0)*/;
+      state.mode = TYPE;
+      /* falls through */
+    case TYPE:
+      if (flush === Z_BLOCK || flush === Z_TREES) { break inf_leave; }
+      /* falls through */
+    case TYPEDO:
+      if (state.last) {
+        //--- BYTEBITS() ---//
+        hold >>>= bits & 7;
+        bits -= bits & 7;
+        //---//
+        state.mode = CHECK;
+        break;
+      }
+      //=== NEEDBITS(3); */
+      while (bits < 3) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      state.last = (hold & 0x01)/*BITS(1)*/;
+      //--- DROPBITS(1) ---//
+      hold >>>= 1;
+      bits -= 1;
+      //---//
+
+      switch ((hold & 0x03)/*BITS(2)*/) {
+      case 0:                             /* stored block */
+        //Tracev((stderr, "inflate:     stored block%s\n",
+        //        state.last ? " (last)" : ""));
+        state.mode = STORED;
+        break;
+      case 1:                             /* fixed block */
+        fixedtables(state);
+        //Tracev((stderr, "inflate:     fixed codes block%s\n",
+        //        state.last ? " (last)" : ""));
+        state.mode = LEN_;             /* decode codes */
+        if (flush === Z_TREES) {
+          //--- DROPBITS(2) ---//
+          hold >>>= 2;
+          bits -= 2;
+          //---//
+          break inf_leave;
+        }
+        break;
+      case 2:                             /* dynamic block */
+        //Tracev((stderr, "inflate:     dynamic codes block%s\n",
+        //        state.last ? " (last)" : ""));
+        state.mode = TABLE;
+        break;
+      case 3:
+        strm.msg = 'invalid block type';
+        state.mode = BAD;
+      }
+      //--- DROPBITS(2) ---//
+      hold >>>= 2;
+      bits -= 2;
+      //---//
+      break;
+    case STORED:
+      //--- BYTEBITS() ---// /* go to byte boundary */
+      hold >>>= bits & 7;
+      bits -= bits & 7;
+      //---//
+      //=== NEEDBITS(32); */
+      while (bits < 32) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      if ((hold & 0xffff) !== ((hold >>> 16) ^ 0xffff)) {
+        strm.msg = 'invalid stored block lengths';
+        state.mode = BAD;
+        break;
+      }
+      state.length = hold & 0xffff;
+      //Tracev((stderr, "inflate:       stored length %u\n",
+      //        state.length));
+      //=== INITBITS();
+      hold = 0;
+      bits = 0;
+      //===//
+      state.mode = COPY_;
+      if (flush === Z_TREES) { break inf_leave; }
+      /* falls through */
+    case COPY_:
+      state.mode = COPY;
+      /* falls through */
+    case COPY:
+      copy = state.length;
+      if (copy) {
+        if (copy > have) { copy = have; }
+        if (copy > left) { copy = left; }
+        if (copy === 0) { break inf_leave; }
+        //--- zmemcpy(put, next, copy); ---
+        utils.arraySet(output, input, next, copy, put);
+        //---//
+        have -= copy;
+        next += copy;
+        left -= copy;
+        put += copy;
+        state.length -= copy;
+        break;
+      }
+      //Tracev((stderr, "inflate:       stored end\n"));
+      state.mode = TYPE;
+      break;
+    case TABLE:
+      //=== NEEDBITS(14); */
+      while (bits < 14) {
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+      }
+      //===//
+      state.nlen = (hold & 0x1f)/*BITS(5)*/ + 257;
+      //--- DROPBITS(5) ---//
+      hold >>>= 5;
+      bits -= 5;
+      //---//
+      state.ndist = (hold & 0x1f)/*BITS(5)*/ + 1;
+      //--- DROPBITS(5) ---//
+      hold >>>= 5;
+      bits -= 5;
+      //---//
+      state.ncode = (hold & 0x0f)/*BITS(4)*/ + 4;
+      //--- DROPBITS(4) ---//
+      hold >>>= 4;
+      bits -= 4;
+      //---//
+//#ifndef PKZIP_BUG_WORKAROUND
+      if (state.nlen > 286 || state.ndist > 30) {
+        strm.msg = 'too many length or distance symbols';
+        state.mode = BAD;
+        break;
+      }
+//#endif
+      //Tracev((stderr, "inflate:       table sizes ok\n"));
+      state.have = 0;
+      state.mode = LENLENS;
+      /* falls through */
+    case LENLENS:
+      while (state.have < state.ncode) {
+        //=== NEEDBITS(3);
+        while (bits < 3) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        state.lens[order[state.have++]] = (hold & 0x07);//BITS(3);
+        //--- DROPBITS(3) ---//
+        hold >>>= 3;
+        bits -= 3;
+        //---//
+      }
+      while (state.have < 19) {
+        state.lens[order[state.have++]] = 0;
+      }
+      // We have separate tables & no pointers. 2 commented lines below not needed.
+      //state.next = state.codes;
+      //state.lencode = state.next;
+      // Switch to use dynamic table
+      state.lencode = state.lendyn;
+      state.lenbits = 7;
 
-    } else if (curlen === nextlen) {
-      max_count = 6;
-      min_count = 3;
+      opts = { bits: state.lenbits };
+      ret = inflate_table(CODES, state.lens, 0, 19, state.lencode, 0, state.work, opts);
+      state.lenbits = opts.bits;
 
-    } else {
-      max_count = 7;
-      min_count = 4;
-    }
-  }
-}
+      if (ret) {
+        strm.msg = 'invalid code lengths set';
+        state.mode = BAD;
+        break;
+      }
+      //Tracev((stderr, "inflate:       code lengths ok\n"));
+      state.have = 0;
+      state.mode = CODELENS;
+      /* falls through */
+    case CODELENS:
+      while (state.have < state.nlen + state.ndist) {
+        for (;;) {
+          here = state.lencode[hold & ((1 << state.lenbits) - 1)];/*BITS(state.lenbits)*/
+          here_bits = here >>> 24;
+          here_op = (here >>> 16) & 0xff;
+          here_val = here & 0xffff;
 
+          if ((here_bits) <= bits) { break; }
+          //--- PULLBYTE() ---//
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+          //---//
+        }
+        if (here_val < 16) {
+          //--- DROPBITS(here.bits) ---//
+          hold >>>= here_bits;
+          bits -= here_bits;
+          //---//
+          state.lens[state.have++] = here_val;
+        }
+        else {
+          if (here_val === 16) {
+            //=== NEEDBITS(here.bits + 2);
+            n = here_bits + 2;
+            while (bits < n) {
+              if (have === 0) { break inf_leave; }
+              have--;
+              hold += input[next++] << bits;
+              bits += 8;
+            }
+            //===//
+            //--- DROPBITS(here.bits) ---//
+            hold >>>= here_bits;
+            bits -= here_bits;
+            //---//
+            if (state.have === 0) {
+              strm.msg = 'invalid bit length repeat';
+              state.mode = BAD;
+              break;
+            }
+            len = state.lens[state.have - 1];
+            copy = 3 + (hold & 0x03);//BITS(2);
+            //--- DROPBITS(2) ---//
+            hold >>>= 2;
+            bits -= 2;
+            //---//
+          }
+          else if (here_val === 17) {
+            //=== NEEDBITS(here.bits + 3);
+            n = here_bits + 3;
+            while (bits < n) {
+              if (have === 0) { break inf_leave; }
+              have--;
+              hold += input[next++] << bits;
+              bits += 8;
+            }
+            //===//
+            //--- DROPBITS(here.bits) ---//
+            hold >>>= here_bits;
+            bits -= here_bits;
+            //---//
+            len = 0;
+            copy = 3 + (hold & 0x07);//BITS(3);
+            //--- DROPBITS(3) ---//
+            hold >>>= 3;
+            bits -= 3;
+            //---//
+          }
+          else {
+            //=== NEEDBITS(here.bits + 7);
+            n = here_bits + 7;
+            while (bits < n) {
+              if (have === 0) { break inf_leave; }
+              have--;
+              hold += input[next++] << bits;
+              bits += 8;
+            }
+            //===//
+            //--- DROPBITS(here.bits) ---//
+            hold >>>= here_bits;
+            bits -= here_bits;
+            //---//
+            len = 0;
+            copy = 11 + (hold & 0x7f);//BITS(7);
+            //--- DROPBITS(7) ---//
+            hold >>>= 7;
+            bits -= 7;
+            //---//
+          }
+          if (state.have + copy > state.nlen + state.ndist) {
+            strm.msg = 'invalid bit length repeat';
+            state.mode = BAD;
+            break;
+          }
+          while (copy--) {
+            state.lens[state.have++] = len;
+          }
+        }
+      }
 
-/* ===========================================================================
- * Send a literal or distance tree in compressed form, using the codes in
- * bl_tree.
- */
-function send_tree(s, tree, max_code)
-//    deflate_state *s;
-//    ct_data *tree; /* the tree to be scanned */
-//    int max_code;       /* and its largest code of non zero frequency */
-{
-  var n;                     /* iterates over all tree elements */
-  var prevlen = -1;          /* last emitted length */
-  var curlen;                /* length of current code */
+      /* handle error breaks in while */
+      if (state.mode === BAD) { break; }
 
-  var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */
+      /* check for end-of-block code (better have one) */
+      if (state.lens[256] === 0) {
+        strm.msg = 'invalid code -- missing end-of-block';
+        state.mode = BAD;
+        break;
+      }
 
-  var count = 0;             /* repeat count of the current code */
-  var max_count = 7;         /* max repeat count */
-  var min_count = 4;         /* min repeat count */
+      /* build code tables -- note: do not change the lenbits or distbits
+         values here (9 and 6) without reading the comments in inftrees.h
+         concerning the ENOUGH constants, which depend on those values */
+      state.lenbits = 9;
 
-  /* tree[max_code+1].Len = -1; */  /* guard already set */
-  if (nextlen === 0) {
-    max_count = 138;
-    min_count = 3;
-  }
+      opts = { bits: state.lenbits };
+      ret = inflate_table(LENS, state.lens, 0, state.nlen, state.lencode, 0, state.work, opts);
+      // We have separate tables & no pointers. 2 commented lines below not needed.
+      // state.next_index = opts.table_index;
+      state.lenbits = opts.bits;
+      // state.lencode = state.next;
 
-  for (n = 0; n <= max_code; n++) {
-    curlen = nextlen;
-    nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;
+      if (ret) {
+        strm.msg = 'invalid literal/lengths set';
+        state.mode = BAD;
+        break;
+      }
 
-    if (++count < max_count && curlen === nextlen) {
-      continue;
+      state.distbits = 6;
+      //state.distcode.copy(state.codes);
+      // Switch to use dynamic table
+      state.distcode = state.distdyn;
+      opts = { bits: state.distbits };
+      ret = inflate_table(DISTS, state.lens, state.nlen, state.ndist, state.distcode, 0, state.work, opts);
+      // We have separate tables & no pointers. 2 commented lines below not needed.
+      // state.next_index = opts.table_index;
+      state.distbits = opts.bits;
+      // state.distcode = state.next;
 
-    } else if (count < min_count) {
-      do { send_code(s, curlen, s.bl_tree); } while (--count !== 0);
+      if (ret) {
+        strm.msg = 'invalid distances set';
+        state.mode = BAD;
+        break;
+      }
+      //Tracev((stderr, 'inflate:       codes ok\n'));
+      state.mode = LEN_;
+      if (flush === Z_TREES) { break inf_leave; }
+      /* falls through */
+    case LEN_:
+      state.mode = LEN;
+      /* falls through */
+    case LEN:
+      if (have >= 6 && left >= 258) {
+        //--- RESTORE() ---
+        strm.next_out = put;
+        strm.avail_out = left;
+        strm.next_in = next;
+        strm.avail_in = have;
+        state.hold = hold;
+        state.bits = bits;
+        //---
+        inflate_fast(strm, _out);
+        //--- LOAD() ---
+        put = strm.next_out;
+        output = strm.output;
+        left = strm.avail_out;
+        next = strm.next_in;
+        input = strm.input;
+        have = strm.avail_in;
+        hold = state.hold;
+        bits = state.bits;
+        //---
 
-    } else if (curlen !== 0) {
-      if (curlen !== prevlen) {
-        send_code(s, curlen, s.bl_tree);
-        count--;
+        if (state.mode === TYPE) {
+          state.back = -1;
+        }
+        break;
       }
-      //Assert(count >= 3 && count <= 6, " 3_6?");
-      send_code(s, REP_3_6, s.bl_tree);
-      send_bits(s, count - 3, 2);
+      state.back = 0;
+      for (;;) {
+        here = state.lencode[hold & ((1 << state.lenbits) - 1)];  /*BITS(state.lenbits)*/
+        here_bits = here >>> 24;
+        here_op = (here >>> 16) & 0xff;
+        here_val = here & 0xffff;
 
-    } else if (count <= 10) {
-      send_code(s, REPZ_3_10, s.bl_tree);
-      send_bits(s, count - 3, 3);
+        if (here_bits <= bits) { break; }
+        //--- PULLBYTE() ---//
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+        //---//
+      }
+      if (here_op && (here_op & 0xf0) === 0) {
+        last_bits = here_bits;
+        last_op = here_op;
+        last_val = here_val;
+        for (;;) {
+          here = state.lencode[last_val +
+                  ((hold & ((1 << (last_bits + last_op)) - 1))/*BITS(last.bits + last.op)*/ >> last_bits)];
+          here_bits = here >>> 24;
+          here_op = (here >>> 16) & 0xff;
+          here_val = here & 0xffff;
 
-    } else {
-      send_code(s, REPZ_11_138, s.bl_tree);
-      send_bits(s, count - 11, 7);
-    }
+          if ((last_bits + here_bits) <= bits) { break; }
+          //--- PULLBYTE() ---//
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+          //---//
+        }
+        //--- DROPBITS(last.bits) ---//
+        hold >>>= last_bits;
+        bits -= last_bits;
+        //---//
+        state.back += last_bits;
+      }
+      //--- DROPBITS(here.bits) ---//
+      hold >>>= here_bits;
+      bits -= here_bits;
+      //---//
+      state.back += here_bits;
+      state.length = here_val;
+      if (here_op === 0) {
+        //Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+        //        "inflate:         literal '%c'\n" :
+        //        "inflate:         literal 0x%02x\n", here.val));
+        state.mode = LIT;
+        break;
+      }
+      if (here_op & 32) {
+        //Tracevv((stderr, "inflate:         end of block\n"));
+        state.back = -1;
+        state.mode = TYPE;
+        break;
+      }
+      if (here_op & 64) {
+        strm.msg = 'invalid literal/length code';
+        state.mode = BAD;
+        break;
+      }
+      state.extra = here_op & 15;
+      state.mode = LENEXT;
+      /* falls through */
+    case LENEXT:
+      if (state.extra) {
+        //=== NEEDBITS(state.extra);
+        n = state.extra;
+        while (bits < n) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        state.length += hold & ((1 << state.extra) - 1)/*BITS(state.extra)*/;
+        //--- DROPBITS(state.extra) ---//
+        hold >>>= state.extra;
+        bits -= state.extra;
+        //---//
+        state.back += state.extra;
+      }
+      //Tracevv((stderr, "inflate:         length %u\n", state.length));
+      state.was = state.length;
+      state.mode = DIST;
+      /* falls through */
+    case DIST:
+      for (;;) {
+        here = state.distcode[hold & ((1 << state.distbits) - 1)];/*BITS(state.distbits)*/
+        here_bits = here >>> 24;
+        here_op = (here >>> 16) & 0xff;
+        here_val = here & 0xffff;
 
-    count = 0;
-    prevlen = curlen;
-    if (nextlen === 0) {
-      max_count = 138;
-      min_count = 3;
+        if ((here_bits) <= bits) { break; }
+        //--- PULLBYTE() ---//
+        if (have === 0) { break inf_leave; }
+        have--;
+        hold += input[next++] << bits;
+        bits += 8;
+        //---//
+      }
+      if ((here_op & 0xf0) === 0) {
+        last_bits = here_bits;
+        last_op = here_op;
+        last_val = here_val;
+        for (;;) {
+          here = state.distcode[last_val +
+                  ((hold & ((1 << (last_bits + last_op)) - 1))/*BITS(last.bits + last.op)*/ >> last_bits)];
+          here_bits = here >>> 24;
+          here_op = (here >>> 16) & 0xff;
+          here_val = here & 0xffff;
 
-    } else if (curlen === nextlen) {
-      max_count = 6;
-      min_count = 3;
+          if ((last_bits + here_bits) <= bits) { break; }
+          //--- PULLBYTE() ---//
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+          //---//
+        }
+        //--- DROPBITS(last.bits) ---//
+        hold >>>= last_bits;
+        bits -= last_bits;
+        //---//
+        state.back += last_bits;
+      }
+      //--- DROPBITS(here.bits) ---//
+      hold >>>= here_bits;
+      bits -= here_bits;
+      //---//
+      state.back += here_bits;
+      if (here_op & 64) {
+        strm.msg = 'invalid distance code';
+        state.mode = BAD;
+        break;
+      }
+      state.offset = here_val;
+      state.extra = (here_op) & 15;
+      state.mode = DISTEXT;
+      /* falls through */
+    case DISTEXT:
+      if (state.extra) {
+        //=== NEEDBITS(state.extra);
+        n = state.extra;
+        while (bits < n) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        state.offset += hold & ((1 << state.extra) - 1)/*BITS(state.extra)*/;
+        //--- DROPBITS(state.extra) ---//
+        hold >>>= state.extra;
+        bits -= state.extra;
+        //---//
+        state.back += state.extra;
+      }
+//#ifdef INFLATE_STRICT
+      if (state.offset > state.dmax) {
+        strm.msg = 'invalid distance too far back';
+        state.mode = BAD;
+        break;
+      }
+//#endif
+      //Tracevv((stderr, "inflate:         distance %u\n", state.offset));
+      state.mode = MATCH;
+      /* falls through */
+    case MATCH:
+      if (left === 0) { break inf_leave; }
+      copy = _out - left;
+      if (state.offset > copy) {         /* copy from window */
+        copy = state.offset - copy;
+        if (copy > state.whave) {
+          if (state.sane) {
+            strm.msg = 'invalid distance too far back';
+            state.mode = BAD;
+            break;
+          }
+// (!) This block is disabled in zlib defailts,
+// don't enable it for binary compatibility
+//#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+//          Trace((stderr, "inflate.c too far\n"));
+//          copy -= state.whave;
+//          if (copy > state.length) { copy = state.length; }
+//          if (copy > left) { copy = left; }
+//          left -= copy;
+//          state.length -= copy;
+//          do {
+//            output[put++] = 0;
+//          } while (--copy);
+//          if (state.length === 0) { state.mode = LEN; }
+//          break;
+//#endif
+        }
+        if (copy > state.wnext) {
+          copy -= state.wnext;
+          from = state.wsize - copy;
+        }
+        else {
+          from = state.wnext - copy;
+        }
+        if (copy > state.length) { copy = state.length; }
+        from_source = state.window;
+      }
+      else {                              /* copy from output */
+        from_source = output;
+        from = put - state.offset;
+        copy = state.length;
+      }
+      if (copy > left) { copy = left; }
+      left -= copy;
+      state.length -= copy;
+      do {
+        output[put++] = from_source[from++];
+      } while (--copy);
+      if (state.length === 0) { state.mode = LEN; }
+      break;
+    case LIT:
+      if (left === 0) { break inf_leave; }
+      output[put++] = state.length;
+      left--;
+      state.mode = LEN;
+      break;
+    case CHECK:
+      if (state.wrap) {
+        //=== NEEDBITS(32);
+        while (bits < 32) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          // Use '|' insdead of '+' to make sure that result is signed
+          hold |= input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        _out -= left;
+        strm.total_out += _out;
+        state.total += _out;
+        if (_out) {
+          strm.adler = state.check =
+              /*UPDATE(state.check, put - _out, _out);*/
+              (state.flags ? crc32(state.check, output, _out, put - _out) : adler32(state.check, output, _out, put - _out));
 
-    } else {
-      max_count = 7;
-      min_count = 4;
+        }
+        _out = left;
+        // NB: crc32 stored as signed 32-bit int, zswap32 returns signed too
+        if ((state.flags ? hold : zswap32(hold)) !== state.check) {
+          strm.msg = 'incorrect data check';
+          state.mode = BAD;
+          break;
+        }
+        //=== INITBITS();
+        hold = 0;
+        bits = 0;
+        //===//
+        //Tracev((stderr, "inflate:   check matches trailer\n"));
+      }
+      state.mode = LENGTH;
+      /* falls through */
+    case LENGTH:
+      if (state.wrap && state.flags) {
+        //=== NEEDBITS(32);
+        while (bits < 32) {
+          if (have === 0) { break inf_leave; }
+          have--;
+          hold += input[next++] << bits;
+          bits += 8;
+        }
+        //===//
+        if (hold !== (state.total & 0xffffffff)) {
+          strm.msg = 'incorrect length check';
+          state.mode = BAD;
+          break;
+        }
+        //=== INITBITS();
+        hold = 0;
+        bits = 0;
+        //===//
+        //Tracev((stderr, "inflate:   length matches trailer\n"));
+      }
+      state.mode = DONE;
+      /* falls through */
+    case DONE:
+      ret = Z_STREAM_END;
+      break inf_leave;
+    case BAD:
+      ret = Z_DATA_ERROR;
+      break inf_leave;
+    case MEM:
+      return Z_MEM_ERROR;
+    case SYNC:
+      /* falls through */
+    default:
+      return Z_STREAM_ERROR;
     }
   }
-}
-
 
-/* ===========================================================================
- * Construct the Huffman tree for the bit lengths and return the index in
- * bl_order of the last bit length code to send.
- */
-function build_bl_tree(s) {
-  var max_blindex;  /* index of last bit length code of non zero freq */
-
-  /* Determine the bit length frequencies for literal and distance trees */
-  scan_tree(s, s.dyn_ltree, s.l_desc.max_code);
-  scan_tree(s, s.dyn_dtree, s.d_desc.max_code);
+  // inf_leave <- here is real place for "goto inf_leave", emulated via "break inf_leave"
 
-  /* Build the bit length tree: */
-  build_tree(s, s.bl_desc);
-  /* opt_len now includes the length of the tree representations, except
-   * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
+  /*
+     Return from inflate(), updating the total counts and the check value.
+     If there was no progress during the inflate() call, return a buffer
+     error.  Call updatewindow() to create and/or update the window state.
+     Note: a memory error from inflate() is non-recoverable.
    */
 
-  /* Determine the number of bit length codes to send. The pkzip format
-   * requires that at least 4 bit length codes be sent. (appnote.txt says
-   * 3 but the actual value used is 4.)
-   */
-  for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {
-    if (s.bl_tree[bl_order[max_blindex] * 2 + 1]/*.Len*/ !== 0) {
-      break;
+  //--- RESTORE() ---
+  strm.next_out = put;
+  strm.avail_out = left;
+  strm.next_in = next;
+  strm.avail_in = have;
+  state.hold = hold;
+  state.bits = bits;
+  //---
+
+  if (state.wsize || (_out !== strm.avail_out && state.mode < BAD &&
+                      (state.mode < CHECK || flush !== Z_FINISH))) {
+    if (updatewindow(strm, strm.output, strm.next_out, _out - strm.avail_out)) {
+      state.mode = MEM;
+      return Z_MEM_ERROR;
     }
   }
-  /* Update opt_len to include the bit length tree and counts */
-  s.opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;
-  //Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
-  //        s->opt_len, s->static_len));
-
-  return max_blindex;
+  _in -= strm.avail_in;
+  _out -= strm.avail_out;
+  strm.total_in += _in;
+  strm.total_out += _out;
+  state.total += _out;
+  if (state.wrap && _out) {
+    strm.adler = state.check = /*UPDATE(state.check, strm.next_out - _out, _out);*/
+      (state.flags ? crc32(state.check, output, _out, strm.next_out - _out) : adler32(state.check, output, _out, strm.next_out - _out));
+  }
+  strm.data_type = state.bits + (state.last ? 64 : 0) +
+                    (state.mode === TYPE ? 128 : 0) +
+                    (state.mode === LEN_ || state.mode === COPY_ ? 256 : 0);
+  if (((_in === 0 && _out === 0) || flush === Z_FINISH) && ret === Z_OK) {
+    ret = Z_BUF_ERROR;
+  }
+  return ret;
 }
 
+function inflateEnd(strm) {
 
-/* ===========================================================================
- * Send the header for a block using dynamic Huffman trees: the counts, the
- * lengths of the bit length codes, the literal tree and the distance tree.
- * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
- */
-function send_all_trees(s, lcodes, dcodes, blcodes)
-//    deflate_state *s;
-//    int lcodes, dcodes, blcodes; /* number of codes for each tree */
-{
-  var rank;                    /* index in bl_order */
+  if (!strm || !strm.state /*|| strm->zfree == (free_func)0*/) {
+    return Z_STREAM_ERROR;
+  }
 
-  //Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
-  //Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
-  //        "too many codes");
-  //Tracev((stderr, "\nbl counts: "));
-  send_bits(s, lcodes - 257, 5); /* not +255 as stated in appnote.txt */
-  send_bits(s, dcodes - 1,   5);
-  send_bits(s, blcodes - 4,  4); /* not -3 as stated in appnote.txt */
-  for (rank = 0; rank < blcodes; rank++) {
-    //Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
-    send_bits(s, s.bl_tree[bl_order[rank] * 2 + 1]/*.Len*/, 3);
+  var state = strm.state;
+  if (state.window) {
+    state.window = null;
   }
-  //Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
+  strm.state = null;
+  return Z_OK;
+}
 
-  send_tree(s, s.dyn_ltree, lcodes - 1); /* literal tree */
-  //Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
+function inflateGetHeader(strm, head) {
+  var state;
 
-  send_tree(s, s.dyn_dtree, dcodes - 1); /* distance tree */
-  //Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
+  /* check state */
+  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
+  state = strm.state;
+  if ((state.wrap & 2) === 0) { return Z_STREAM_ERROR; }
+
+  /* save header structure */
+  state.head = head;
+  head.done = false;
+  return Z_OK;
 }
 
+function inflateSetDictionary(strm, dictionary) {
+  var dictLength = dictionary.length;
 
-/* ===========================================================================
- * Check if the data type is TEXT or BINARY, using the following algorithm:
- * - TEXT if the two conditions below are satisfied:
- *    a) There are no non-portable control characters belonging to the
- *       "black list" (0..6, 14..25, 28..31).
- *    b) There is at least one printable character belonging to the
- *       "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
- * - BINARY otherwise.
- * - The following partially-portable control characters form a
- *   "gray list" that is ignored in this detection algorithm:
- *   (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
- * IN assertion: the fields Freq of dyn_ltree are set.
- */
-function detect_data_type(s) {
-  /* black_mask is the bit mask of black-listed bytes
-   * set bits 0..6, 14..25, and 28..31
-   * 0xf3ffc07f = binary 11110011111111111100000001111111
-   */
-  var black_mask = 0xf3ffc07f;
-  var n;
+  var state;
+  var dictid;
+  var ret;
 
-  /* Check for non-textual ("black-listed") bytes. */
-  for (n = 0; n <= 31; n++, black_mask >>>= 1) {
-    if ((black_mask & 1) && (s.dyn_ltree[n * 2]/*.Freq*/ !== 0)) {
-      return Z_BINARY;
-    }
-  }
+  /* check state */
+  if (!strm /* == Z_NULL */ || !strm.state /* == Z_NULL */) { return Z_STREAM_ERROR; }
+  state = strm.state;
 
-  /* Check for textual ("white-listed") bytes. */
-  if (s.dyn_ltree[9 * 2]/*.Freq*/ !== 0 || s.dyn_ltree[10 * 2]/*.Freq*/ !== 0 ||
-      s.dyn_ltree[13 * 2]/*.Freq*/ !== 0) {
-    return Z_TEXT;
+  if (state.wrap !== 0 && state.mode !== DICT) {
+    return Z_STREAM_ERROR;
   }
-  for (n = 32; n < LITERALS; n++) {
-    if (s.dyn_ltree[n * 2]/*.Freq*/ !== 0) {
-      return Z_TEXT;
+
+  /* check for correct dictionary identifier */
+  if (state.mode === DICT) {
+    dictid = 1; /* adler32(0, null, 0)*/
+    /* dictid = adler32(dictid, dictionary, dictLength); */
+    dictid = adler32(dictid, dictionary, dictLength, 0);
+    if (dictid !== state.check) {
+      return Z_DATA_ERROR;
     }
   }
-
-  /* There are no "black-listed" or "white-listed" bytes:
-   * this stream either is empty or has tolerated ("gray-listed") bytes only.
-   */
-  return Z_BINARY;
+  /* copy dictionary to window using updatewindow(), which will amend the
+   existing dictionary if appropriate */
+  ret = updatewindow(strm, dictionary, dictLength, dictLength);
+  if (ret) {
+    state.mode = MEM;
+    return Z_MEM_ERROR;
+  }
+  state.havedict = 1;
+  // Tracev((stderr, "inflate:   dictionary set\n"));
+  return Z_OK;
 }
 
+exports.inflateReset = inflateReset;
+exports.inflateReset2 = inflateReset2;
+exports.inflateResetKeep = inflateResetKeep;
+exports.inflateInit = inflateInit;
+exports.inflateInit2 = inflateInit2;
+exports.inflate = inflate;
+exports.inflateEnd = inflateEnd;
+exports.inflateGetHeader = inflateGetHeader;
+exports.inflateSetDictionary = inflateSetDictionary;
+exports.inflateInfo = 'pako inflate (from Nodeca project)';
 
-var static_init_done = false;
-
-/* ===========================================================================
- * Initialize the tree data structures for a new zlib stream.
- */
-function _tr_init(s)
-{
+/* Not implemented
+exports.inflateCopy = inflateCopy;
+exports.inflateGetDictionary = inflateGetDictionary;
+exports.inflateMark = inflateMark;
+exports.inflatePrime = inflatePrime;
+exports.inflateSync = inflateSync;
+exports.inflateSyncPoint = inflateSyncPoint;
+exports.inflateUndermine = inflateUndermine;
+*/
 
-  if (!static_init_done) {
-    tr_static_init();
-    static_init_done = true;
-  }
+},{"../utils/common":167,"./adler32":169,"./crc32":171,"./inffast":174,"./inftrees":176}],176:[function(_dereq_,module,exports){
+'use strict';
 
-  s.l_desc  = new TreeDesc(s.dyn_ltree, static_l_desc);
-  s.d_desc  = new TreeDesc(s.dyn_dtree, static_d_desc);
-  s.bl_desc = new TreeDesc(s.bl_tree, static_bl_desc);
 
-  s.bi_buf = 0;
-  s.bi_valid = 0;
+var utils = _dereq_('../utils/common');
 
-  /* Initialize the first block of the first file: */
-  init_block(s);
-}
+var MAXBITS = 15;
+var ENOUGH_LENS = 852;
+var ENOUGH_DISTS = 592;
+//var ENOUGH = (ENOUGH_LENS+ENOUGH_DISTS);
 
+var CODES = 0;
+var LENS = 1;
+var DISTS = 2;
 
-/* ===========================================================================
- * Send a stored block
- */
-function _tr_stored_block(s, buf, stored_len, last)
-//DeflateState *s;
-//charf *buf;       /* input block */
-//ulg stored_len;   /* length of input block */
-//int last;         /* one if this is the last block for a file */
-{
-  send_bits(s, (STORED_BLOCK << 1) + (last ? 1 : 0), 3);    /* send block type */
-  copy_block(s, buf, stored_len, true); /* with header */
-}
+var lbase = [ /* Length codes 257..285 base */
+  3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
+  35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
+];
 
+var lext = [ /* Length codes 257..285 extra */
+  16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
+  19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78
+];
 
-/* ===========================================================================
- * Send one empty static block to give enough lookahead for inflate.
- * This takes 10 bits, of which 7 may remain in the bit buffer.
- */
-function _tr_align(s) {
-  send_bits(s, STATIC_TREES << 1, 3);
-  send_code(s, END_BLOCK, static_ltree);
-  bi_flush(s);
-}
+var dbase = [ /* Distance codes 0..29 base */
+  1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
+  257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
+  8193, 12289, 16385, 24577, 0, 0
+];
 
+var dext = [ /* Distance codes 0..29 extra */
+  16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
+  23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
+  28, 28, 29, 29, 64, 64
+];
 
-/* ===========================================================================
- * Determine the best encoding for the current block: dynamic trees, static
- * trees or store, and output the encoded block to the zip file.
- */
-function _tr_flush_block(s, buf, stored_len, last)
-//DeflateState *s;
-//charf *buf;       /* input block, or NULL if too old */
-//ulg stored_len;   /* length of input block */
-//int last;         /* one if this is the last block for a file */
+module.exports = function inflate_table(type, lens, lens_index, codes, table, table_index, work, opts)
 {
-  var opt_lenb, static_lenb;  /* opt_len and static_len in bytes */
-  var max_blindex = 0;        /* index of last bit length code of non zero freq */
-
-  /* Build the Huffman trees unless a stored block is forced */
-  if (s.level > 0) {
+  var bits = opts.bits;
+      //here = opts.here; /* table entry for duplication */
 
-    /* Check if the file is binary or text */
-    if (s.strm.data_type === Z_UNKNOWN) {
-      s.strm.data_type = detect_data_type(s);
-    }
+  var len = 0;               /* a code's length in bits */
+  var sym = 0;               /* index of code symbols */
+  var min = 0, max = 0;          /* minimum and maximum code lengths */
+  var root = 0;              /* number of index bits for root table */
+  var curr = 0;              /* number of index bits for current table */
+  var drop = 0;              /* code bits to drop for sub-table */
+  var left = 0;                   /* number of prefix codes available */
+  var used = 0;              /* code entries in table used */
+  var huff = 0;              /* Huffman code */
+  var incr;              /* for incrementing code, index */
+  var fill;              /* index for replicating entries */
+  var low;               /* low bits for current root entry */
+  var mask;              /* mask for low root bits */
+  var next;             /* next available space in table */
+  var base = null;     /* base value table to use */
+  var base_index = 0;
+//  var shoextra;    /* extra bits table to use */
+  var end;                    /* use base and extra for symbol > end */
+  var count = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];    /* number of codes of each length */
+  var offs = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];     /* offsets in table for each length */
+  var extra = null;
+  var extra_index = 0;
 
-    /* Construct the literal and distance trees */
-    build_tree(s, s.l_desc);
-    // Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
-    //        s->static_len));
+  var here_bits, here_op, here_val;
 
-    build_tree(s, s.d_desc);
-    // Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
-    //        s->static_len));
-    /* At this point, opt_len and static_len are the total bit lengths of
-     * the compressed block data, excluding the tree representations.
-     */
+  /*
+   Process a set of code lengths to create a canonical Huffman code.  The
+   code lengths are lens[0..codes-1].  Each length corresponds to the
+   symbols 0..codes-1.  The Huffman code is generated by first sorting the
+   symbols by length from short to long, and retaining the symbol order
+   for codes with equal lengths.  Then the code starts with all zero bits
+   for the first code of the shortest length, and the codes are integer
+   increments for the same length, and zeros are appended as the length
+   increases.  For the deflate format, these bits are stored backwards
+   from their more natural integer increment ordering, and so when the
+   decoding tables are built in the large loop below, the integer codes
+   are incremented backwards.
 
-    /* Build the bit length tree for the above two trees, and get the index
-     * in bl_order of the last bit length code to send.
-     */
-    max_blindex = build_bl_tree(s);
+   This routine assumes, but does not check, that all of the entries in
+   lens[] are in the range 0..MAXBITS.  The caller must assure this.
+   1..MAXBITS is interpreted as that code length.  zero means that that
+   symbol does not occur in this code.
 
-    /* Determine the best encoding. Compute the block lengths in bytes. */
-    opt_lenb = (s.opt_len + 3 + 7) >>> 3;
-    static_lenb = (s.static_len + 3 + 7) >>> 3;
+   The codes are sorted by computing a count of codes for each length,
+   creating from that a table of starting indices for each length in the
+   sorted table, and then entering the symbols in order in the sorted
+   table.  The sorted table is work[], with that space being provided by
+   the caller.
 
-    // Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
-    //        opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
-    //        s->last_lit));
+   The length counts are used for other purposes as well, i.e. finding
+   the minimum and maximum length codes, determining if there are any
+   codes at all, checking for a valid set of lengths, and looking ahead
+   at length counts to determine sub-table sizes when building the
+   decoding tables.
+   */
 
-    if (static_lenb <= opt_lenb) { opt_lenb = static_lenb; }
+  /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
+  for (len = 0; len <= MAXBITS; len++) {
+    count[len] = 0;
+  }
+  for (sym = 0; sym < codes; sym++) {
+    count[lens[lens_index + sym]]++;
+  }
 
-  } else {
-    // Assert(buf != (char*)0, "lost buf");
-    opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
+  /* bound code lengths, force root to be within code lengths */
+  root = bits;
+  for (max = MAXBITS; max >= 1; max--) {
+    if (count[max] !== 0) { break; }
+  }
+  if (root > max) {
+    root = max;
   }
+  if (max === 0) {                     /* no symbols to code at all */
+    //table.op[opts.table_index] = 64;  //here.op = (var char)64;    /* invalid code marker */
+    //table.bits[opts.table_index] = 1;   //here.bits = (var char)1;
+    //table.val[opts.table_index++] = 0;   //here.val = (var short)0;
+    table[table_index++] = (1 << 24) | (64 << 16) | 0;
 
-  if ((stored_len + 4 <= opt_lenb) && (buf !== -1)) {
-    /* 4: two words for the lengths */
 
-    /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
-     * Otherwise we can't have processed more than WSIZE input bytes since
-     * the last block flush, because compression would have been
-     * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
-     * transform a block into a stored block.
-     */
-    _tr_stored_block(s, buf, stored_len, last);
+    //table.op[opts.table_index] = 64;
+    //table.bits[opts.table_index] = 1;
+    //table.val[opts.table_index++] = 0;
+    table[table_index++] = (1 << 24) | (64 << 16) | 0;
 
-  } else if (s.strategy === Z_FIXED || static_lenb === opt_lenb) {
+    opts.bits = 1;
+    return 0;     /* no symbols, but wait for decoding to report error */
+  }
+  for (min = 1; min < max; min++) {
+    if (count[min] !== 0) { break; }
+  }
+  if (root < min) {
+    root = min;
+  }
 
-    send_bits(s, (STATIC_TREES << 1) + (last ? 1 : 0), 3);
-    compress_block(s, static_ltree, static_dtree);
+  /* check for an over-subscribed or incomplete set of lengths */
+  left = 1;
+  for (len = 1; len <= MAXBITS; len++) {
+    left <<= 1;
+    left -= count[len];
+    if (left < 0) {
+      return -1;
+    }        /* over-subscribed */
+  }
+  if (left > 0 && (type === CODES || max !== 1)) {
+    return -1;                      /* incomplete set */
+  }
 
-  } else {
-    send_bits(s, (DYN_TREES << 1) + (last ? 1 : 0), 3);
-    send_all_trees(s, s.l_desc.max_code + 1, s.d_desc.max_code + 1, max_blindex + 1);
-    compress_block(s, s.dyn_ltree, s.dyn_dtree);
+  /* generate offsets into symbol table for each length for sorting */
+  offs[1] = 0;
+  for (len = 1; len < MAXBITS; len++) {
+    offs[len + 1] = offs[len] + count[len];
   }
-  // Assert (s->compressed_len == s->bits_sent, "bad compressed size");
-  /* The above check is made mod 2^32, for files larger than 512 MB
-   * and uLong implemented on 32 bits.
-   */
-  init_block(s);
 
-  if (last) {
-    bi_windup(s);
+  /* sort symbols by length, by symbol order within each length */
+  for (sym = 0; sym < codes; sym++) {
+    if (lens[lens_index + sym] !== 0) {
+      work[offs[lens[lens_index + sym]]++] = sym;
+    }
   }
-  // Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
-  //       s->compressed_len-7*last));
-}
 
-/* ===========================================================================
- * Save the match info and tally the frequency counts. Return true if
- * the current block must be flushed.
- */
-function _tr_tally(s, dist, lc)
-//    deflate_state *s;
-//    unsigned dist;  /* distance of matched string */
-//    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
-{
-  //var out_length, in_length, dcode;
+  /*
+   Create and fill in decoding tables.  In this loop, the table being
+   filled is at next and has curr index bits.  The code being used is huff
+   with length len.  That code is converted to an index by dropping drop
+   bits off of the bottom.  For codes where len is less than drop + curr,
+   those top drop + curr - len bits are incremented through all values to
+   fill the table with replicated entries.
 
-  s.pending_buf[s.d_buf + s.last_lit * 2]     = (dist >>> 8) & 0xff;
-  s.pending_buf[s.d_buf + s.last_lit * 2 + 1] = dist & 0xff;
+   root is the number of index bits for the root table.  When len exceeds
+   root, sub-tables are created pointed to by the root entry with an index
+   of the low root bits of huff.  This is saved in low to check for when a
+   new sub-table should be started.  drop is zero when the root table is
+   being filled, and drop is root when sub-tables are being filled.
 
-  s.pending_buf[s.l_buf + s.last_lit] = lc & 0xff;
-  s.last_lit++;
+   When a new sub-table is needed, it is necessary to look ahead in the
+   code lengths to determine what size sub-table is needed.  The length
+   counts are used for this, and so count[] is decremented as codes are
+   entered in the tables.
 
-  if (dist === 0) {
-    /* lc is the unmatched char */
-    s.dyn_ltree[lc * 2]/*.Freq*/++;
-  } else {
-    s.matches++;
-    /* Here, lc is the match length - MIN_MATCH */
-    dist--;             /* dist = match distance - 1 */
-    //Assert((ush)dist < (ush)MAX_DIST(s) &&
-    //       (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
-    //       (ush)d_code(dist) < (ush)D_CODES,  "_tr_tally: bad match");
+   used keeps track of how many table entries have been allocated from the
+   provided *table space.  It is checked for LENS and DIST tables against
+   the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
+   the initial root table size constants.  See the comments in inftrees.h
+   for more information.
 
-    s.dyn_ltree[(_length_code[lc] + LITERALS + 1) * 2]/*.Freq*/++;
-    s.dyn_dtree[d_code(dist) * 2]/*.Freq*/++;
-  }
+   sym increments through all symbols, and the loop terminates when
+   all codes of length max, i.e. all codes, have been processed.  This
+   routine permits incomplete codes, so another loop after this one fills
+   in the rest of the decoding tables with invalid code markers.
+   */
 
-// (!) This block is disabled in zlib defailts,
-// don't enable it for binary compatibility
+  /* set up for code type */
+  // poor man optimization - use if-else instead of switch,
+  // to avoid deopts in old v8
+  if (type === CODES) {
+    base = extra = work;    /* dummy value--not used */
+    end = 19;
 
-//#ifdef TRUNCATE_BLOCK
-//  /* Try to guess if it is profitable to stop the current block here */
-//  if ((s.last_lit & 0x1fff) === 0 && s.level > 2) {
-//    /* Compute an upper bound for the compressed length */
-//    out_length = s.last_lit*8;
-//    in_length = s.strstart - s.block_start;
-//
-//    for (dcode = 0; dcode < D_CODES; dcode++) {
-//      out_length += s.dyn_dtree[dcode*2]/*.Freq*/ * (5 + extra_dbits[dcode]);
-//    }
-//    out_length >>>= 3;
-//    //Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
-//    //       s->last_lit, in_length, out_length,
-//    //       100L - out_length*100L/in_length));
-//    if (s.matches < (s.last_lit>>1)/*int /2*/ && out_length < (in_length>>1)/*int /2*/) {
-//      return true;
-//    }
-//  }
-//#endif
+  } else if (type === LENS) {
+    base = lbase;
+    base_index -= 257;
+    extra = lext;
+    extra_index -= 257;
+    end = 256;
 
-  return (s.last_lit === s.lit_bufsize - 1);
-  /* We avoid equality with lit_bufsize because of wraparound at 64K
-   * on 16 bit machines and because stored blocks are restricted to
-   * 64K-1 bytes.
-   */
-}
+  } else {                    /* DISTS */
+    base = dbase;
+    extra = dext;
+    end = -1;
+  }
 
-exports._tr_init  = _tr_init;
-exports._tr_stored_block = _tr_stored_block;
-exports._tr_flush_block  = _tr_flush_block;
-exports._tr_tally = _tr_tally;
-exports._tr_align = _tr_align;
+  /* initialize opts for loop */
+  huff = 0;                   /* starting code */
+  sym = 0;                    /* starting code symbol */
+  len = min;                  /* starting code length */
+  next = table_index;              /* current table to fill in */
+  curr = root;                /* current table index bits */
+  drop = 0;                   /* current bits to drop from code for index */
+  low = -1;                   /* trigger new sub-table when len > root */
+  used = 1 << root;          /* use root table entries */
+  mask = used - 1;            /* mask for comparing low */
 
-},{"../utils/common":163}],175:[function(_dereq_,module,exports){
-'use strict';
+  /* check available table space */
+  if ((type === LENS && used > ENOUGH_LENS) ||
+    (type === DISTS && used > ENOUGH_DISTS)) {
+    return 1;
+  }
 
+  var i = 0;
+  /* process all codes and make table entries */
+  for (;;) {
+    i++;
+    /* create table entry */
+    here_bits = len - drop;
+    if (work[sym] < end) {
+      here_op = 0;
+      here_val = work[sym];
+    }
+    else if (work[sym] > end) {
+      here_op = extra[extra_index + work[sym]];
+      here_val = base[base_index + work[sym]];
+    }
+    else {
+      here_op = 32 + 64;         /* end of block */
+      here_val = 0;
+    }
 
-function ZStream() {
-  /* next input byte */
-  this.input = null; // JS specific, because we have no pointers
-  this.next_in = 0;
-  /* number of bytes available at input */
-  this.avail_in = 0;
-  /* total number of input bytes read so far */
-  this.total_in = 0;
-  /* next output byte should be put there */
-  this.output = null; // JS specific, because we have no pointers
-  this.next_out = 0;
-  /* remaining free space at output */
-  this.avail_out = 0;
-  /* total number of bytes output so far */
-  this.total_out = 0;
-  /* last error message, NULL if no error */
-  this.msg = ''/*Z_NULL*/;
-  /* not visible by applications */
-  this.state = null;
-  /* best guess about the data type: binary or text */
-  this.data_type = 2/*Z_UNKNOWN*/;
-  /* adler32 value of the uncompressed data */
-  this.adler = 0;
-}
+    /* replicate for those indices with low len bits equal to huff */
+    incr = 1 << (len - drop);
+    fill = 1 << curr;
+    min = fill;                 /* save offset to next table */
+    do {
+      fill -= incr;
+      table[next + (huff >> drop) + fill] = (here_bits << 24) | (here_op << 16) | here_val |0;
+    } while (fill !== 0);
 
-module.exports = ZStream;
+    /* backwards increment the len-bit code huff */
+    incr = 1 << (len - 1);
+    while (huff & incr) {
+      incr >>= 1;
+    }
+    if (incr !== 0) {
+      huff &= incr - 1;
+      huff += incr;
+    } else {
+      huff = 0;
+    }
 
-},{}],176:[function(_dereq_,module,exports){
-// a duplex stream is just a stream that is both readable and writable.
-// Since JS doesn't have multiple prototypal inheritance, this class
-// prototypally inherits from Readable, and then parasitically from
-// Writable.
+    /* go to next symbol, update count, len */
+    sym++;
+    if (--count[len] === 0) {
+      if (len === max) { break; }
+      len = lens[lens_index + work[sym]];
+    }
 
-'use strict';
+    /* create new sub-table if needed */
+    if (len > root && (huff & mask) !== low) {
+      /* if first time, transition to sub-tables */
+      if (drop === 0) {
+        drop = root;
+      }
 
-/*<replacement>*/
+      /* increment past last table */
+      next += min;            /* here min is 1 << curr */
 
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    keys.push(key);
-  }return keys;
-};
-/*</replacement>*/
+      /* determine length of next table */
+      curr = len - drop;
+      left = 1 << curr;
+      while (curr + drop < max) {
+        left -= count[curr + drop];
+        if (left <= 0) { break; }
+        curr++;
+        left <<= 1;
+      }
 
-module.exports = Duplex;
+      /* check for enough space */
+      used += 1 << curr;
+      if ((type === LENS && used > ENOUGH_LENS) ||
+        (type === DISTS && used > ENOUGH_DISTS)) {
+        return 1;
+      }
 
-/*<replacement>*/
-var processNextTick = _dereq_('process-nextick-args');
-/*</replacement>*/
+      /* point entry in root table to sub-table */
+      low = huff & mask;
+      /*table.op[low] = curr;
+      table.bits[low] = root;
+      table.val[low] = next - opts.table_index;*/
+      table[low] = (root << 24) | (curr << 16) | (next - table_index) |0;
+    }
+  }
 
-/*<replacement>*/
-var util = _dereq_('core-util-is');
-util.inherits = _dereq_('inherits');
-/*</replacement>*/
+  /* fill in remaining table entry if code is incomplete (guaranteed to have
+   at most one remaining entry, since if the code is incomplete, the
+   maximum code length that was allowed to get this far is one bit) */
+  if (huff !== 0) {
+    //table.op[next + huff] = 64;            /* invalid code marker */
+    //table.bits[next + huff] = len - drop;
+    //table.val[next + huff] = 0;
+    table[next + huff] = ((len - drop) << 24) | (64 << 16) |0;
+  }
 
-var Readable = _dereq_('./_stream_readable');
-var Writable = _dereq_('./_stream_writable');
+  /* set return parameters */
+  //opts.table_index += used;
+  opts.bits = root;
+  return 0;
+};
 
-util.inherits(Duplex, Readable);
+},{"../utils/common":167}],177:[function(_dereq_,module,exports){
+'use strict';
 
-var keys = objectKeys(Writable.prototype);
-for (var v = 0; v < keys.length; v++) {
-  var method = keys[v];
-  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-}
+module.exports = {
+  2:      'need dictionary',     /* Z_NEED_DICT       2  */
+  1:      'stream end',          /* Z_STREAM_END      1  */
+  0:      '',                    /* Z_OK              0  */
+  '-1':   'file error',          /* Z_ERRNO         (-1) */
+  '-2':   'stream error',        /* Z_STREAM_ERROR  (-2) */
+  '-3':   'data error',          /* Z_DATA_ERROR    (-3) */
+  '-4':   'insufficient memory', /* Z_MEM_ERROR     (-4) */
+  '-5':   'buffer error',        /* Z_BUF_ERROR     (-5) */
+  '-6':   'incompatible version' /* Z_VERSION_ERROR (-6) */
+};
 
-function Duplex(options) {
-  if (!(this instanceof Duplex)) return new Duplex(options);
+},{}],178:[function(_dereq_,module,exports){
+'use strict';
 
-  Readable.call(this, options);
-  Writable.call(this, options);
 
-  if (options && options.readable === false) this.readable = false;
+var utils = _dereq_('../utils/common');
 
-  if (options && options.writable === false) this.writable = false;
+/* Public constants ==========================================================*/
+/* ===========================================================================*/
 
-  this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
 
-  this.once('end', onend);
-}
+//var Z_FILTERED          = 1;
+//var Z_HUFFMAN_ONLY      = 2;
+//var Z_RLE               = 3;
+var Z_FIXED               = 4;
+//var Z_DEFAULT_STRATEGY  = 0;
 
-// the no-half-open enforcer
-function onend() {
-  // if we allow half-open state, or if the writable side ended,
-  // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended) return;
+/* Possible values of the data_type field (though see inflate()) */
+var Z_BINARY              = 0;
+var Z_TEXT                = 1;
+//var Z_ASCII             = 1; // = Z_TEXT
+var Z_UNKNOWN             = 2;
 
-  // no more data can be written.
-  // But allow more writes to happen in this tick.
-  processNextTick(onEndNT, this);
-}
+/*============================================================================*/
 
-function onEndNT(self) {
-  self.end();
-}
 
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
-},{"./_stream_readable":178,"./_stream_writable":180,"core-util-is":181,"inherits":182,"process-nextick-args":184}],177:[function(_dereq_,module,exports){
-// a passthrough stream.
-// basically just the most minimal sort of Transform stream.
-// Every written chunk gets output as-is.
+function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }
 
-'use strict';
+// From zutil.h
 
-module.exports = PassThrough;
+var STORED_BLOCK = 0;
+var STATIC_TREES = 1;
+var DYN_TREES    = 2;
+/* The three kinds of block type */
 
-var Transform = _dereq_('./_stream_transform');
+var MIN_MATCH    = 3;
+var MAX_MATCH    = 258;
+/* The minimum and maximum match lengths */
 
-/*<replacement>*/
-var util = _dereq_('core-util-is');
-util.inherits = _dereq_('inherits');
-/*</replacement>*/
+// From deflate.h
+/* ===========================================================================
+ * Internal compression state.
+ */
 
-util.inherits(PassThrough, Transform);
+var LENGTH_CODES  = 29;
+/* number of length codes, not counting the special END_BLOCK code */
 
-function PassThrough(options) {
-  if (!(this instanceof PassThrough)) return new PassThrough(options);
+var LITERALS      = 256;
+/* number of literal bytes 0..255 */
 
-  Transform.call(this, options);
-}
+var L_CODES       = LITERALS + 1 + LENGTH_CODES;
+/* number of Literal or Length codes, including the END_BLOCK code */
 
-PassThrough.prototype._transform = function (chunk, encoding, cb) {
-  cb(null, chunk);
-};
-},{"./_stream_transform":179,"core-util-is":181,"inherits":182}],178:[function(_dereq_,module,exports){
-(function (process){
-'use strict';
+var D_CODES       = 30;
+/* number of distance codes */
 
-module.exports = Readable;
+var BL_CODES      = 19;
+/* number of codes used to transfer the bit lengths */
 
-/*<replacement>*/
-var processNextTick = _dereq_('process-nextick-args');
-/*</replacement>*/
+var HEAP_SIZE     = 2 * L_CODES + 1;
+/* maximum heap size */
 
-/*<replacement>*/
-var isArray = _dereq_('isarray');
-/*</replacement>*/
+var MAX_BITS      = 15;
+/* All codes must not exceed MAX_BITS bits */
 
-/*<replacement>*/
-var Buffer = _dereq_('buffer').Buffer;
-/*</replacement>*/
+var Buf_size      = 16;
+/* size of bit buffer in bi_buf */
 
-Readable.ReadableState = ReadableState;
 
-var EE = _dereq_('events');
+/* ===========================================================================
+ * Constants
+ */
 
-/*<replacement>*/
-var EElistenerCount = function (emitter, type) {
-  return emitter.listeners(type).length;
-};
-/*</replacement>*/
+var MAX_BL_BITS = 7;
+/* Bit length codes must not exceed MAX_BL_BITS bits */
 
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = _dereq_('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = _dereq_('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
+var END_BLOCK   = 256;
+/* end of block literal code */
 
-var Buffer = _dereq_('buffer').Buffer;
+var REP_3_6     = 16;
+/* repeat previous bit length 3-6 times (2 bits of repeat count) */
 
-/*<replacement>*/
-var util = _dereq_('core-util-is');
-util.inherits = _dereq_('inherits');
-/*</replacement>*/
+var REPZ_3_10   = 17;
+/* repeat a zero length 3-10 times  (3 bits of repeat count) */
 
-/*<replacement>*/
-var debugUtil = _dereq_('util');
-var debug = undefined;
-if (debugUtil && debugUtil.debuglog) {
-  debug = debugUtil.debuglog('stream');
-} else {
-  debug = function () {};
-}
-/*</replacement>*/
+var REPZ_11_138 = 18;
+/* repeat a zero length 11-138 times  (7 bits of repeat count) */
 
-var StringDecoder;
+/* eslint-disable comma-spacing,array-bracket-spacing */
+var extra_lbits =   /* extra bits for each length code */
+  [0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0];
 
-util.inherits(Readable, Stream);
+var extra_dbits =   /* extra bits for each distance code */
+  [0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13];
 
-var Duplex;
-function ReadableState(options, stream) {
-  Duplex = Duplex || _dereq_('./_stream_duplex');
+var extra_blbits =  /* extra bits for each bit length code */
+  [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7];
 
-  options = options || {};
+var bl_order =
+  [16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15];
+/* eslint-enable comma-spacing,array-bracket-spacing */
 
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
+/* The lengths of the bit length codes are sent in order of decreasing
+ * probability, to avoid transmitting the lengths for unused bit length codes.
+ */
 
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
+/* ===========================================================================
+ * Local data. These are initialized only once.
+ */
 
-  // the point at which it stops calling _read() to fill the buffer
-  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
+// We pre-fill arrays with 0 to avoid uninitialized gaps
 
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
+var DIST_CODE_LEN = 512; /* see definition of array dist_code below */
 
-  this.buffer = [];
-  this.length = 0;
-  this.pipes = null;
-  this.pipesCount = 0;
-  this.flowing = null;
-  this.ended = false;
-  this.endEmitted = false;
-  this.reading = false;
+// !!!! Use flat array insdead of structure, Freq = i*2, Len = i*2+1
+var static_ltree  = new Array((L_CODES + 2) * 2);
+zero(static_ltree);
+/* The static literal tree. Since the bit lengths are imposed, there is no
+ * need for the L_CODES extra codes used during heap construction. However
+ * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
+ * below).
+ */
 
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
+var static_dtree  = new Array(D_CODES * 2);
+zero(static_dtree);
+/* The static distance tree. (Actually a trivial tree since all codes use
+ * 5 bits.)
+ */
 
-  // whenever we return null, then we set a flag to say
-  // that we're awaiting a 'readable' event emission.
-  this.needReadable = false;
-  this.emittedReadable = false;
-  this.readableListening = false;
-  this.resumeScheduled = false;
+var _dist_code    = new Array(DIST_CODE_LEN);
+zero(_dist_code);
+/* Distance codes. The first 256 values correspond to the distances
+ * 3 .. 258, the last 256 values correspond to the top 8 bits of
+ * the 15 bit distances.
+ */
 
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
+var _length_code  = new Array(MAX_MATCH - MIN_MATCH + 1);
+zero(_length_code);
+/* length code for each normalized match length (0 == MIN_MATCH) */
 
-  // when piping, we only care about 'readable' events that happen
-  // after read()ing all the bytes and not getting any pushback.
-  this.ranOut = false;
+var base_length   = new Array(LENGTH_CODES);
+zero(base_length);
+/* First normalized length for each code (0 = MIN_MATCH) */
 
-  // the number of writers that are awaiting a drain event in .pipe()s
-  this.awaitDrain = 0;
+var base_dist     = new Array(D_CODES);
+zero(base_dist);
+/* First normalized distance for each code (0 = distance of 1) */
 
-  // if true, a maybeReadMore has been scheduled
-  this.readingMore = false;
 
-  this.decoder = null;
-  this.encoding = null;
-  if (options.encoding) {
-    if (!StringDecoder) StringDecoder = _dereq_('string_decoder/').StringDecoder;
-    this.decoder = new StringDecoder(options.encoding);
-    this.encoding = options.encoding;
-  }
-}
+function StaticTreeDesc(static_tree, extra_bits, extra_base, elems, max_length) {
 
-var Duplex;
-function Readable(options) {
-  Duplex = Duplex || _dereq_('./_stream_duplex');
+  this.static_tree  = static_tree;  /* static tree or NULL */
+  this.extra_bits   = extra_bits;   /* extra bits for each code or NULL */
+  this.extra_base   = extra_base;   /* base index for extra_bits */
+  this.elems        = elems;        /* max number of elements in the tree */
+  this.max_length   = max_length;   /* max bit length for the codes */
 
-  if (!(this instanceof Readable)) return new Readable(options);
+  // show if `static_tree` has data or dummy - needed for monomorphic objects
+  this.has_stree    = static_tree && static_tree.length;
+}
 
-  this._readableState = new ReadableState(options, this);
 
-  // legacy
-  this.readable = true;
+var static_l_desc;
+var static_d_desc;
+var static_bl_desc;
 
-  if (options && typeof options.read === 'function') this._read = options.read;
 
-  Stream.call(this);
+function TreeDesc(dyn_tree, stat_desc) {
+  this.dyn_tree = dyn_tree;     /* the dynamic tree */
+  this.max_code = 0;            /* largest code with non zero frequency */
+  this.stat_desc = stat_desc;   /* the corresponding static tree */
 }
 
-// Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-Readable.prototype.push = function (chunk, encoding) {
-  var state = this._readableState;
 
-  if (!state.objectMode && typeof chunk === 'string') {
-    encoding = encoding || state.defaultEncoding;
-    if (encoding !== state.encoding) {
-      chunk = new Buffer(chunk, encoding);
-      encoding = '';
-    }
-  }
 
-  return readableAddChunk(this, state, chunk, encoding, false);
-};
+function d_code(dist) {
+  return dist < 256 ? _dist_code[dist] : _dist_code[256 + (dist >>> 7)];
+}
 
-// Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function (chunk) {
-  var state = this._readableState;
-  return readableAddChunk(this, state, chunk, '', true);
-};
 
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
+/* ===========================================================================
+ * Output a short LSB first on the stream.
+ * IN assertion: there is enough room in pendingBuf.
+ */
+function put_short(s, w) {
+//    put_byte(s, (uch)((w) & 0xff));
+//    put_byte(s, (uch)((ush)(w) >> 8));
+  s.pending_buf[s.pending++] = (w) & 0xff;
+  s.pending_buf[s.pending++] = (w >>> 8) & 0xff;
+}
 
-function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-  var er = chunkInvalid(state, chunk);
-  if (er) {
-    stream.emit('error', er);
-  } else if (chunk === null) {
-    state.reading = false;
-    onEofChunk(stream, state);
-  } else if (state.objectMode || chunk && chunk.length > 0) {
-    if (state.ended && !addToFront) {
-      var e = new Error('stream.push() after EOF');
-      stream.emit('error', e);
-    } else if (state.endEmitted && addToFront) {
-      var e = new Error('stream.unshift() after end event');
-      stream.emit('error', e);
-    } else {
-      var skipAdd;
-      if (state.decoder && !addToFront && !encoding) {
-        chunk = state.decoder.write(chunk);
-        skipAdd = !state.objectMode && chunk.length === 0;
-      }
 
-      if (!addToFront) state.reading = false;
+/* ===========================================================================
+ * Send a value on a given number of bits.
+ * IN assertion: length <= 16 and value fits in length bits.
+ */
+function send_bits(s, value, length) {
+  if (s.bi_valid > (Buf_size - length)) {
+    s.bi_buf |= (value << s.bi_valid) & 0xffff;
+    put_short(s, s.bi_buf);
+    s.bi_buf = value >> (Buf_size - s.bi_valid);
+    s.bi_valid += length - Buf_size;
+  } else {
+    s.bi_buf |= (value << s.bi_valid) & 0xffff;
+    s.bi_valid += length;
+  }
+}
 
-      // Don't add to the buffer if we've decoded to an empty string chunk and
-      // we're not in object mode
-      if (!skipAdd) {
-        // if we want the data now, just emit it.
-        if (state.flowing && state.length === 0 && !state.sync) {
-          stream.emit('data', chunk);
-          stream.read(0);
-        } else {
-          // update the buffer info.
-          state.length += state.objectMode ? 1 : chunk.length;
-          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
 
-          if (state.needReadable) emitReadable(stream);
-        }
-      }
+function send_code(s, c, tree) {
+  send_bits(s, tree[c * 2]/*.Code*/, tree[c * 2 + 1]/*.Len*/);
+}
 
-      maybeReadMore(stream, state);
-    }
-  } else if (!addToFront) {
-    state.reading = false;
-  }
 
-  return needMoreData(state);
+/* ===========================================================================
+ * Reverse the first len bits of a code, using straightforward code (a faster
+ * method would use a table)
+ * IN assertion: 1 <= len <= 15
+ */
+function bi_reverse(code, len) {
+  var res = 0;
+  do {
+    res |= code & 1;
+    code >>>= 1;
+    res <<= 1;
+  } while (--len > 0);
+  return res >>> 1;
 }
 
-// if it's past the high water mark, we can push in some more.
-// Also, if we have no data yet, we can stand some
-// more bytes.  This is to work around cases where hwm=0,
-// such as the repl.  Also, if the push() triggered a
-// readable event, and the user called read(largeNumber) such that
-// needReadable was set, then we ought to push more, so that another
-// 'readable' event will be triggered.
-function needMoreData(state) {
-  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-}
 
-// backwards compatibility.
-Readable.prototype.setEncoding = function (enc) {
-  if (!StringDecoder) StringDecoder = _dereq_('string_decoder/').StringDecoder;
-  this._readableState.decoder = new StringDecoder(enc);
-  this._readableState.encoding = enc;
-  return this;
-};
+/* ===========================================================================
+ * Flush the bit buffer, keeping at most 7 bits in it.
+ */
+function bi_flush(s) {
+  if (s.bi_valid === 16) {
+    put_short(s, s.bi_buf);
+    s.bi_buf = 0;
+    s.bi_valid = 0;
 
-// Don't raise the hwm > 8MB
-var MAX_HWM = 0x800000;
-function computeNewHighWaterMark(n) {
-  if (n >= MAX_HWM) {
-    n = MAX_HWM;
-  } else {
-    // Get the next highest power of 2
-    n--;
-    n |= n >>> 1;
-    n |= n >>> 2;
-    n |= n >>> 4;
-    n |= n >>> 8;
-    n |= n >>> 16;
-    n++;
+  } else if (s.bi_valid >= 8) {
+    s.pending_buf[s.pending++] = s.bi_buf & 0xff;
+    s.bi_buf >>= 8;
+    s.bi_valid -= 8;
   }
-  return n;
 }
 
-function howMuchToRead(n, state) {
-  if (state.length === 0 && state.ended) return 0;
 
-  if (state.objectMode) return n === 0 ? 0 : 1;
+/* ===========================================================================
+ * Compute the optimal bit lengths for a tree and update the total bit length
+ * for the current block.
+ * IN assertion: the fields freq and dad are set, heap[heap_max] and
+ *    above are the tree nodes sorted by increasing frequency.
+ * OUT assertions: the field len is set to the optimal bit length, the
+ *     array bl_count contains the frequencies for each bit length.
+ *     The length opt_len is updated; static_len is also updated if stree is
+ *     not null.
+ */
+function gen_bitlen(s, desc)
+//    deflate_state *s;
+//    tree_desc *desc;    /* the tree descriptor */
+{
+  var tree            = desc.dyn_tree;
+  var max_code        = desc.max_code;
+  var stree           = desc.stat_desc.static_tree;
+  var has_stree       = desc.stat_desc.has_stree;
+  var extra           = desc.stat_desc.extra_bits;
+  var base            = desc.stat_desc.extra_base;
+  var max_length      = desc.stat_desc.max_length;
+  var h;              /* heap index */
+  var n, m;           /* iterate over the tree elements */
+  var bits;           /* bit length */
+  var xbits;          /* extra bits */
+  var f;              /* frequency */
+  var overflow = 0;   /* number of elements with bit length too large */
 
-  if (n === null || isNaN(n)) {
-    // only flow one buffer at a time
-    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
+  for (bits = 0; bits <= MAX_BITS; bits++) {
+    s.bl_count[bits] = 0;
   }
 
-  if (n <= 0) return 0;
+  /* In a first pass, compute the optimal bit lengths (which may
+   * overflow in the case of the bit length tree).
+   */
+  tree[s.heap[s.heap_max] * 2 + 1]/*.Len*/ = 0; /* root of the heap */
 
-  // If we're asking for more than the target buffer level,
-  // then raise the water mark.  Bump up to the next highest
-  // power of 2, to prevent increasing it excessively in tiny
-  // amounts.
-  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
+  for (h = s.heap_max + 1; h < HEAP_SIZE; h++) {
+    n = s.heap[h];
+    bits = tree[tree[n * 2 + 1]/*.Dad*/ * 2 + 1]/*.Len*/ + 1;
+    if (bits > max_length) {
+      bits = max_length;
+      overflow++;
+    }
+    tree[n * 2 + 1]/*.Len*/ = bits;
+    /* We overwrite tree[n].Dad which is no longer needed */
 
-  // don't have that much.  return null, unless we've ended.
-  if (n > state.length) {
-    if (!state.ended) {
-      state.needReadable = true;
-      return 0;
-    } else {
-      return state.length;
+    if (n > max_code) { continue; } /* not a leaf node */
+
+    s.bl_count[bits]++;
+    xbits = 0;
+    if (n >= base) {
+      xbits = extra[n - base];
+    }
+    f = tree[n * 2]/*.Freq*/;
+    s.opt_len += f * (bits + xbits);
+    if (has_stree) {
+      s.static_len += f * (stree[n * 2 + 1]/*.Len*/ + xbits);
     }
   }
+  if (overflow === 0) { return; }
 
-  return n;
+  // Trace((stderr,"\nbit length overflow\n"));
+  /* This happens for example on obj2 and pic of the Calgary corpus */
+
+  /* Find the first bit length which could increase: */
+  do {
+    bits = max_length - 1;
+    while (s.bl_count[bits] === 0) { bits--; }
+    s.bl_count[bits]--;      /* move one leaf down the tree */
+    s.bl_count[bits + 1] += 2; /* move one overflow item as its brother */
+    s.bl_count[max_length]--;
+    /* The brother of the overflow item also moves one step up,
+     * but this does not affect bl_count[max_length]
+     */
+    overflow -= 2;
+  } while (overflow > 0);
+
+  /* Now recompute all bit lengths, scanning in increasing frequency.
+   * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
+   * lengths instead of fixing only the wrong ones. This idea is taken
+   * from 'ar' written by Haruhiko Okumura.)
+   */
+  for (bits = max_length; bits !== 0; bits--) {
+    n = s.bl_count[bits];
+    while (n !== 0) {
+      m = s.heap[--h];
+      if (m > max_code) { continue; }
+      if (tree[m * 2 + 1]/*.Len*/ !== bits) {
+        // Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
+        s.opt_len += (bits - tree[m * 2 + 1]/*.Len*/) * tree[m * 2]/*.Freq*/;
+        tree[m * 2 + 1]/*.Len*/ = bits;
+      }
+      n--;
+    }
+  }
 }
 
-// you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function (n) {
-  debug('read', n);
-  var state = this._readableState;
-  var nOrig = n;
 
-  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;
+/* ===========================================================================
+ * Generate the codes for a given tree and bit counts (which need not be
+ * optimal).
+ * IN assertion: the array bl_count contains the bit length statistics for
+ * the given tree and the field len is set for all tree elements.
+ * OUT assertion: the field code is set for all tree elements of non
+ *     zero code length.
+ */
+function gen_codes(tree, max_code, bl_count)
+//    ct_data *tree;             /* the tree to decorate */
+//    int max_code;              /* largest code with non zero frequency */
+//    ushf *bl_count;            /* number of codes at each bit length */
+{
+  var next_code = new Array(MAX_BITS + 1); /* next code value for each bit length */
+  var code = 0;              /* running code value */
+  var bits;                  /* bit index */
+  var n;                     /* code index */
 
-  // if we're doing read(0) to trigger a readable event, but we
-  // already have a bunch of data in the buffer, then just trigger
-  // the 'readable' event and move on.
-  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-    debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-    return null;
+  /* The distribution counts are first used to generate the code values
+   * without bit reversal.
+   */
+  for (bits = 1; bits <= MAX_BITS; bits++) {
+    next_code[bits] = code = (code + bl_count[bits - 1]) << 1;
   }
+  /* Check that the bit counts in bl_count are consistent. The last code
+   * must be all ones.
+   */
+  //Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
+  //        "inconsistent bit counts");
+  //Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
 
-  n = howMuchToRead(n, state);
+  for (n = 0;  n <= max_code; n++) {
+    var len = tree[n * 2 + 1]/*.Len*/;
+    if (len === 0) { continue; }
+    /* Now reverse the bits */
+    tree[n * 2]/*.Code*/ = bi_reverse(next_code[len]++, len);
 
-  // if we've ended, and we're now clear, then finish it up.
-  if (n === 0 && state.ended) {
-    if (state.length === 0) endReadable(this);
-    return null;
+    //Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
+    //     n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
   }
+}
 
-  // All the actual chunk generation logic needs to be
-  // *below* the call to _read.  The reason is that in certain
-  // synthetic stream cases, such as passthrough streams, _read
-  // may be a completely synchronous operation which may change
-  // the state of the read buffer, providing enough data when
-  // before there was *not* enough.
-  //
-  // So, the steps are:
-  // 1. Figure out what the state of things will be after we do
-  // a read from the buffer.
-  //
-  // 2. If that resulting state will trigger a _read, then call _read.
-  // Note that this may be asynchronous, or synchronous.  Yes, it is
-  // deeply ugly to write APIs this way, but that still doesn't mean
-  // that the Readable class should behave improperly, as streams are
-  // designed to be sync/async agnostic.
-  // Take note if the _read call is sync or async (ie, if the read call
-  // has returned yet), so that we know whether or not it's safe to emit
-  // 'readable' etc.
-  //
-  // 3. Actually pull the requested chunks out of the buffer and return.
 
-  // if we need a readable event, then we need to do some reading.
-  var doRead = state.needReadable;
-  debug('need readable', doRead);
+/* ===========================================================================
+ * Initialize the various 'constant' tables.
+ */
+function tr_static_init() {
+  var n;        /* iterates over tree elements */
+  var bits;     /* bit counter */
+  var length;   /* length value */
+  var code;     /* code value */
+  var dist;     /* distance index */
+  var bl_count = new Array(MAX_BITS + 1);
+  /* number of codes at each bit length for an optimal tree */
 
-  // if we currently have less than the highWaterMark, then also read some
-  if (state.length === 0 || state.length - n < state.highWaterMark) {
-    doRead = true;
-    debug('length less than watermark', doRead);
-  }
+  // do check in _tr_init()
+  //if (static_init_done) return;
 
-  // however, if we've ended, then there's no point, and if we're already
-  // reading, then it's unnecessary.
-  if (state.ended || state.reading) {
-    doRead = false;
-    debug('reading or ended', doRead);
+  /* For some embedded targets, global variables are not initialized: */
+/*#ifdef NO_INIT_GLOBAL_POINTERS
+  static_l_desc.static_tree = static_ltree;
+  static_l_desc.extra_bits = extra_lbits;
+  static_d_desc.static_tree = static_dtree;
+  static_d_desc.extra_bits = extra_dbits;
+  static_bl_desc.extra_bits = extra_blbits;
+#endif*/
+
+  /* Initialize the mapping length (0..255) -> length code (0..28) */
+  length = 0;
+  for (code = 0; code < LENGTH_CODES - 1; code++) {
+    base_length[code] = length;
+    for (n = 0; n < (1 << extra_lbits[code]); n++) {
+      _length_code[length++] = code;
+    }
   }
+  //Assert (length == 256, "tr_static_init: length != 256");
+  /* Note that the length 255 (match length 258) can be represented
+   * in two different ways: code 284 + 5 bits or code 285, so we
+   * overwrite length_code[255] to use the best encoding:
+   */
+  _length_code[length - 1] = code;
 
-  if (doRead) {
-    debug('do read');
-    state.reading = true;
-    state.sync = true;
-    // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0) state.needReadable = true;
-    // call internal read method
-    this._read(state.highWaterMark);
-    state.sync = false;
+  /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
+  dist = 0;
+  for (code = 0; code < 16; code++) {
+    base_dist[code] = dist;
+    for (n = 0; n < (1 << extra_dbits[code]); n++) {
+      _dist_code[dist++] = code;
+    }
+  }
+  //Assert (dist == 256, "tr_static_init: dist != 256");
+  dist >>= 7; /* from now on, all distances are divided by 128 */
+  for (; code < D_CODES; code++) {
+    base_dist[code] = dist << 7;
+    for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {
+      _dist_code[256 + dist++] = code;
+    }
   }
+  //Assert (dist == 256, "tr_static_init: 256+dist != 512");
 
-  // If _read pushed data synchronously, then `reading` will be false,
-  // and we need to re-evaluate how much data we can return to the user.
-  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);
+  /* Construct the codes of the static literal tree */
+  for (bits = 0; bits <= MAX_BITS; bits++) {
+    bl_count[bits] = 0;
+  }
 
-  var ret;
-  if (n > 0) ret = fromList(n, state);else ret = null;
+  n = 0;
+  while (n <= 143) {
+    static_ltree[n * 2 + 1]/*.Len*/ = 8;
+    n++;
+    bl_count[8]++;
+  }
+  while (n <= 255) {
+    static_ltree[n * 2 + 1]/*.Len*/ = 9;
+    n++;
+    bl_count[9]++;
+  }
+  while (n <= 279) {
+    static_ltree[n * 2 + 1]/*.Len*/ = 7;
+    n++;
+    bl_count[7]++;
+  }
+  while (n <= 287) {
+    static_ltree[n * 2 + 1]/*.Len*/ = 8;
+    n++;
+    bl_count[8]++;
+  }
+  /* Codes 286 and 287 do not exist, but we must include them in the
+   * tree construction to get a canonical Huffman tree (longest code
+   * all ones)
+   */
+  gen_codes(static_ltree, L_CODES + 1, bl_count);
 
-  if (ret === null) {
-    state.needReadable = true;
-    n = 0;
+  /* The static distance tree is trivial: */
+  for (n = 0; n < D_CODES; n++) {
+    static_dtree[n * 2 + 1]/*.Len*/ = 5;
+    static_dtree[n * 2]/*.Code*/ = bi_reverse(n, 5);
   }
 
-  state.length -= n;
+  // Now data ready and we can init static trees
+  static_l_desc = new StaticTreeDesc(static_ltree, extra_lbits, LITERALS + 1, L_CODES, MAX_BITS);
+  static_d_desc = new StaticTreeDesc(static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS);
+  static_bl_desc = new StaticTreeDesc(new Array(0), extra_blbits, 0,         BL_CODES, MAX_BL_BITS);
 
-  // If we have nothing in the buffer, then we want to know
-  // as soon as we *do* get something into the buffer.
-  if (state.length === 0 && !state.ended) state.needReadable = true;
+  //static_init_done = true;
+}
 
-  // If we tried to read() past the EOF, then emit end on the next tick.
-  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);
 
-  if (ret !== null) this.emit('data', ret);
+/* ===========================================================================
+ * Initialize a new block.
+ */
+function init_block(s) {
+  var n; /* iterates over tree elements */
 
-  return ret;
-};
+  /* Initialize the trees. */
+  for (n = 0; n < L_CODES;  n++) { s.dyn_ltree[n * 2]/*.Freq*/ = 0; }
+  for (n = 0; n < D_CODES;  n++) { s.dyn_dtree[n * 2]/*.Freq*/ = 0; }
+  for (n = 0; n < BL_CODES; n++) { s.bl_tree[n * 2]/*.Freq*/ = 0; }
 
-function chunkInvalid(state, chunk) {
-  var er = null;
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
+  s.dyn_ltree[END_BLOCK * 2]/*.Freq*/ = 1;
+  s.opt_len = s.static_len = 0;
+  s.last_lit = s.matches = 0;
 }
 
-function onEofChunk(stream, state) {
-  if (state.ended) return;
-  if (state.decoder) {
-    var chunk = state.decoder.end();
-    if (chunk && chunk.length) {
-      state.buffer.push(chunk);
-      state.length += state.objectMode ? 1 : chunk.length;
-    }
+
+/* ===========================================================================
+ * Flush the bit buffer and align the output on a byte boundary
+ */
+function bi_windup(s)
+{
+  if (s.bi_valid > 8) {
+    put_short(s, s.bi_buf);
+  } else if (s.bi_valid > 0) {
+    //put_byte(s, (Byte)s->bi_buf);
+    s.pending_buf[s.pending++] = s.bi_buf;
   }
-  state.ended = true;
-
-  // emit 'readable' now to make sure it gets picked up.
-  emitReadable(stream);
+  s.bi_buf = 0;
+  s.bi_valid = 0;
 }
 
-// Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow.  This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-function emitReadable(stream) {
-  var state = stream._readableState;
-  state.needReadable = false;
-  if (!state.emittedReadable) {
-    debug('emitReadable', state.flowing);
-    state.emittedReadable = true;
-    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
+/* ===========================================================================
+ * Copy a stored block, storing first the length and its
+ * one's complement if requested.
+ */
+function copy_block(s, buf, len, header)
+//DeflateState *s;
+//charf    *buf;    /* the input data */
+//unsigned len;     /* its length */
+//int      header;  /* true if block header must be written */
+{
+  bi_windup(s);        /* align on byte boundary */
+
+  if (header) {
+    put_short(s, len);
+    put_short(s, ~len);
   }
+//  while (len--) {
+//    put_byte(s, *buf++);
+//  }
+  utils.arraySet(s.pending_buf, s.window, buf, len, s.pending);
+  s.pending += len;
 }
 
-function emitReadable_(stream) {
-  debug('emit readable');
-  stream.emit('readable');
-  flow(stream);
+/* ===========================================================================
+ * Compares to subtrees, using the tree depth as tie breaker when
+ * the subtrees have equal frequency. This minimizes the worst case length.
+ */
+function smaller(tree, n, m, depth) {
+  var _n2 = n * 2;
+  var _m2 = m * 2;
+  return (tree[_n2]/*.Freq*/ < tree[_m2]/*.Freq*/ ||
+         (tree[_n2]/*.Freq*/ === tree[_m2]/*.Freq*/ && depth[n] <= depth[m]));
 }
 
-// at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data.  that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-function maybeReadMore(stream, state) {
-  if (!state.readingMore) {
-    state.readingMore = true;
-    processNextTick(maybeReadMore_, stream, state);
-  }
-}
+/* ===========================================================================
+ * Restore the heap property by moving down the tree starting at node k,
+ * exchanging a node with the smallest of its two sons if necessary, stopping
+ * when the heap property is re-established (each father smaller than its
+ * two sons).
+ */
+function pqdownheap(s, tree, k)
+//    deflate_state *s;
+//    ct_data *tree;  /* the tree to restore */
+//    int k;               /* node to move down */
+{
+  var v = s.heap[k];
+  var j = k << 1;  /* left son of k */
+  while (j <= s.heap_len) {
+    /* Set j to the smallest of the two sons: */
+    if (j < s.heap_len &&
+      smaller(tree, s.heap[j + 1], s.heap[j], s.depth)) {
+      j++;
+    }
+    /* Exit if v is smaller than both sons */
+    if (smaller(tree, v, s.heap[j], s.depth)) { break; }
 
-function maybeReadMore_(stream, state) {
-  var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-    debug('maybeReadMore read 0');
-    stream.read(0);
-    if (len === state.length)
-      // didn't get any data, stop spinning.
-      break;else len = state.length;
+    /* Exchange v with the smallest son */
+    s.heap[k] = s.heap[j];
+    k = j;
+
+    /* And continue down the tree, setting j to the left son of k */
+    j <<= 1;
   }
-  state.readingMore = false;
+  s.heap[k] = v;
 }
 
-// abstract method.  to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function (n) {
-  this.emit('error', new Error('not implemented'));
-};
 
-Readable.prototype.pipe = function (dest, pipeOpts) {
-  var src = this;
-  var state = this._readableState;
+// inlined manually
+// var SMALLEST = 1;
 
-  switch (state.pipesCount) {
-    case 0:
-      state.pipes = dest;
-      break;
-    case 1:
-      state.pipes = [state.pipes, dest];
-      break;
-    default:
-      state.pipes.push(dest);
-      break;
-  }
-  state.pipesCount += 1;
-  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
+/* ===========================================================================
+ * Send the block data compressed using the given Huffman trees
+ */
+function compress_block(s, ltree, dtree)
+//    deflate_state *s;
+//    const ct_data *ltree; /* literal tree */
+//    const ct_data *dtree; /* distance tree */
+{
+  var dist;           /* distance of matched string */
+  var lc;             /* match length or unmatched char (if dist == 0) */
+  var lx = 0;         /* running index in l_buf */
+  var code;           /* the code to send */
+  var extra;          /* number of extra bits to send */
 
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
+  if (s.last_lit !== 0) {
+    do {
+      dist = (s.pending_buf[s.d_buf + lx * 2] << 8) | (s.pending_buf[s.d_buf + lx * 2 + 1]);
+      lc = s.pending_buf[s.l_buf + lx];
+      lx++;
 
-  var endFn = doEnd ? onend : cleanup;
-  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
+      if (dist === 0) {
+        send_code(s, lc, ltree); /* send a literal byte */
+        //Tracecv(isgraph(lc), (stderr," '%c' ", lc));
+      } else {
+        /* Here, lc is the match length - MIN_MATCH */
+        code = _length_code[lc];
+        send_code(s, code + LITERALS + 1, ltree); /* send the length code */
+        extra = extra_lbits[code];
+        if (extra !== 0) {
+          lc -= base_length[code];
+          send_bits(s, lc, extra);       /* send the extra length bits */
+        }
+        dist--; /* dist is now the match distance - 1 */
+        code = d_code(dist);
+        //Assert (code < D_CODES, "bad d_code");
 
-  dest.on('unpipe', onunpipe);
-  function onunpipe(readable) {
-    debug('onunpipe');
-    if (readable === src) {
-      cleanup();
-    }
-  }
+        send_code(s, code, dtree);       /* send the distance code */
+        extra = extra_dbits[code];
+        if (extra !== 0) {
+          dist -= base_dist[code];
+          send_bits(s, dist, extra);   /* send the extra distance bits */
+        }
+      } /* literal or match pair ? */
 
-  function onend() {
-    debug('onend');
-    dest.end();
+      /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
+      //Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
+      //       "pendingBuf overflow");
+
+    } while (lx < s.last_lit);
   }
 
-  // when the dest drains, it reduces the awaitDrain counter
-  // on the source.  This would be more elegant with a .once()
-  // handler in flow(), but adding and removing repeatedly is
-  // too slow.
-  var ondrain = pipeOnDrain(src);
-  dest.on('drain', ondrain);
+  send_code(s, END_BLOCK, ltree);
+}
 
-  var cleanedUp = false;
-  function cleanup() {
-    debug('cleanup');
-    // cleanup event handlers once the pipe is broken
-    dest.removeListener('close', onclose);
-    dest.removeListener('finish', onfinish);
-    dest.removeListener('drain', ondrain);
-    dest.removeListener('error', onerror);
-    dest.removeListener('unpipe', onunpipe);
-    src.removeListener('end', onend);
-    src.removeListener('end', cleanup);
-    src.removeListener('data', ondata);
 
-    cleanedUp = true;
+/* ===========================================================================
+ * Construct one Huffman tree and assigns the code bit strings and lengths.
+ * Update the total bit length for the current block.
+ * IN assertion: the field freq is set for all tree elements.
+ * OUT assertions: the fields len and code are set to the optimal bit length
+ *     and corresponding code. The length opt_len is updated; static_len is
+ *     also updated if stree is not null. The field max_code is set.
+ */
+function build_tree(s, desc)
+//    deflate_state *s;
+//    tree_desc *desc; /* the tree descriptor */
+{
+  var tree     = desc.dyn_tree;
+  var stree    = desc.stat_desc.static_tree;
+  var has_stree = desc.stat_desc.has_stree;
+  var elems    = desc.stat_desc.elems;
+  var n, m;          /* iterate over heap elements */
+  var max_code = -1; /* largest code with non zero frequency */
+  var node;          /* new node being created */
 
-    // if the reader is waiting for a drain event from this
-    // specific writer, then it would cause it to never start
-    // flowing again.
-    // So, if this is awaiting a drain, then we just call it now.
-    // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-  }
+  /* Construct the initial heap, with least frequent element in
+   * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
+   * heap[0] is not used.
+   */
+  s.heap_len = 0;
+  s.heap_max = HEAP_SIZE;
 
-  src.on('data', ondata);
-  function ondata(chunk) {
-    debug('ondata');
-    var ret = dest.write(chunk);
-    if (false === ret) {
-      // If the user unpiped during `dest.write()`, it is possible
-      // to get stuck in a permanently paused state if that write
-      // also returned false.
-      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
-        debug('false write response, pause', src._readableState.awaitDrain);
-        src._readableState.awaitDrain++;
-      }
-      src.pause();
+  for (n = 0; n < elems; n++) {
+    if (tree[n * 2]/*.Freq*/ !== 0) {
+      s.heap[++s.heap_len] = max_code = n;
+      s.depth[n] = 0;
+
+    } else {
+      tree[n * 2 + 1]/*.Len*/ = 0;
     }
   }
 
-  // if the dest has an error, then stop piping into it.
-  // however, don't suppress the throwing behavior for this.
-  function onerror(er) {
-    debug('onerror', er);
-    unpipe();
-    dest.removeListener('error', onerror);
-    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
-  }
-  // This is a brutally ugly hack to make sure that our error handler
-  // is attached before any userland ones.  NEVER DO THIS.
-  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];
+  /* The pkzip format requires that at least one distance code exists,
+   * and that at least one bit should be sent even if there is only one
+   * possible code. So to avoid special checks later on we force at least
+   * two codes of non zero frequency.
+   */
+  while (s.heap_len < 2) {
+    node = s.heap[++s.heap_len] = (max_code < 2 ? ++max_code : 0);
+    tree[node * 2]/*.Freq*/ = 1;
+    s.depth[node] = 0;
+    s.opt_len--;
 
-  // Both close and finish should trigger unpipe, but only once.
-  function onclose() {
-    dest.removeListener('finish', onfinish);
-    unpipe();
-  }
-  dest.once('close', onclose);
-  function onfinish() {
-    debug('onfinish');
-    dest.removeListener('close', onclose);
-    unpipe();
+    if (has_stree) {
+      s.static_len -= stree[node * 2 + 1]/*.Len*/;
+    }
+    /* node is 0 or 1 so it does not have extra bits */
   }
-  dest.once('finish', onfinish);
+  desc.max_code = max_code;
 
-  function unpipe() {
-    debug('unpipe');
-    src.unpipe(dest);
-  }
+  /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
+   * establish sub-heaps of increasing lengths:
+   */
+  for (n = (s.heap_len >> 1/*int /2*/); n >= 1; n--) { pqdownheap(s, tree, n); }
 
-  // tell the dest that it's being piped to
-  dest.emit('pipe', src);
+  /* Construct the Huffman tree by repeatedly combining the least two
+   * frequent nodes.
+   */
+  node = elems;              /* next internal node of the tree */
+  do {
+    //pqremove(s, tree, n);  /* n = node of least frequency */
+    /*** pqremove ***/
+    n = s.heap[1/*SMALLEST*/];
+    s.heap[1/*SMALLEST*/] = s.heap[s.heap_len--];
+    pqdownheap(s, tree, 1/*SMALLEST*/);
+    /***/
 
-  // start the flow if it hasn't been started already.
-  if (!state.flowing) {
-    debug('pipe resume');
-    src.resume();
-  }
+    m = s.heap[1/*SMALLEST*/]; /* m = node of next least frequency */
 
-  return dest;
-};
+    s.heap[--s.heap_max] = n; /* keep the nodes sorted by frequency */
+    s.heap[--s.heap_max] = m;
 
-function pipeOnDrain(src) {
-  return function () {
-    var state = src._readableState;
-    debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain) state.awaitDrain--;
-    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
-      state.flowing = true;
-      flow(src);
-    }
-  };
-}
+    /* Create a new node father of n and m */
+    tree[node * 2]/*.Freq*/ = tree[n * 2]/*.Freq*/ + tree[m * 2]/*.Freq*/;
+    s.depth[node] = (s.depth[n] >= s.depth[m] ? s.depth[n] : s.depth[m]) + 1;
+    tree[n * 2 + 1]/*.Dad*/ = tree[m * 2 + 1]/*.Dad*/ = node;
 
-Readable.prototype.unpipe = function (dest) {
-  var state = this._readableState;
+    /* and insert the new node in the heap */
+    s.heap[1/*SMALLEST*/] = node++;
+    pqdownheap(s, tree, 1/*SMALLEST*/);
 
-  // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0) return this;
+  } while (s.heap_len >= 2);
 
-  // just one destination.  most common case.
-  if (state.pipesCount === 1) {
-    // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes) return this;
+  s.heap[--s.heap_max] = s.heap[1/*SMALLEST*/];
 
-    if (!dest) dest = state.pipes;
+  /* At this point, the fields freq and dad are set. We can now
+   * generate the bit lengths.
+   */
+  gen_bitlen(s, desc);
 
-    // got a match.
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-    if (dest) dest.emit('unpipe', this);
-    return this;
-  }
+  /* The field len is now set, we can generate the bit codes */
+  gen_codes(tree, max_code, s.bl_count);
+}
 
-  // slow case. multiple pipe destinations.
 
-  if (!dest) {
-    // remove all.
-    var dests = state.pipes;
-    var len = state.pipesCount;
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
+/* ===========================================================================
+ * Scan a literal or distance tree to determine the frequencies of the codes
+ * in the bit length tree.
+ */
+function scan_tree(s, tree, max_code)
+//    deflate_state *s;
+//    ct_data *tree;   /* the tree to be scanned */
+//    int max_code;    /* and its largest code of non zero frequency */
+{
+  var n;                     /* iterates over all tree elements */
+  var prevlen = -1;          /* last emitted length */
+  var curlen;                /* length of current code */
 
-    for (var _i = 0; _i < len; _i++) {
-      dests[_i].emit('unpipe', this);
-    }return this;
+  var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */
+
+  var count = 0;             /* repeat count of the current code */
+  var max_count = 7;         /* max repeat count */
+  var min_count = 4;         /* min repeat count */
+
+  if (nextlen === 0) {
+    max_count = 138;
+    min_count = 3;
   }
+  tree[(max_code + 1) * 2 + 1]/*.Len*/ = 0xffff; /* guard */
 
-  // try to find the right one.
-  var i = indexOf(state.pipes, dest);
-  if (i === -1) return this;
+  for (n = 0; n <= max_code; n++) {
+    curlen = nextlen;
+    nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;
 
-  state.pipes.splice(i, 1);
-  state.pipesCount -= 1;
-  if (state.pipesCount === 1) state.pipes = state.pipes[0];
+    if (++count < max_count && curlen === nextlen) {
+      continue;
 
-  dest.emit('unpipe', this);
+    } else if (count < min_count) {
+      s.bl_tree[curlen * 2]/*.Freq*/ += count;
 
-  return this;
-};
+    } else if (curlen !== 0) {
 
-// set up data events if they are asked for
-// Ensure readable listeners eventually get something
-Readable.prototype.on = function (ev, fn) {
-  var res = Stream.prototype.on.call(this, ev, fn);
+      if (curlen !== prevlen) { s.bl_tree[curlen * 2]/*.Freq*/++; }
+      s.bl_tree[REP_3_6 * 2]/*.Freq*/++;
 
-  // If listening to data, and it has not explicitly been paused,
-  // then call resume to start the flow of data on the next tick.
-  if (ev === 'data' && false !== this._readableState.flowing) {
-    this.resume();
-  }
+    } else if (count <= 10) {
+      s.bl_tree[REPZ_3_10 * 2]/*.Freq*/++;
 
-  if (ev === 'readable' && !this._readableState.endEmitted) {
-    var state = this._readableState;
-    if (!state.readableListening) {
-      state.readableListening = true;
-      state.emittedReadable = false;
-      state.needReadable = true;
-      if (!state.reading) {
-        processNextTick(nReadingNextTick, this);
-      } else if (state.length) {
-        emitReadable(this, state);
-      }
+    } else {
+      s.bl_tree[REPZ_11_138 * 2]/*.Freq*/++;
     }
-  }
 
-  return res;
-};
-Readable.prototype.addListener = Readable.prototype.on;
+    count = 0;
+    prevlen = curlen;
 
-function nReadingNextTick(self) {
-  debug('readable nexttick read 0');
-  self.read(0);
-}
+    if (nextlen === 0) {
+      max_count = 138;
+      min_count = 3;
 
-// pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-Readable.prototype.resume = function () {
-  var state = this._readableState;
-  if (!state.flowing) {
-    debug('resume');
-    state.flowing = true;
-    resume(this, state);
-  }
-  return this;
-};
+    } else if (curlen === nextlen) {
+      max_count = 6;
+      min_count = 3;
 
-function resume(stream, state) {
-  if (!state.resumeScheduled) {
-    state.resumeScheduled = true;
-    processNextTick(resume_, stream, state);
+    } else {
+      max_count = 7;
+      min_count = 4;
+    }
   }
 }
 
-function resume_(stream, state) {
-  if (!state.reading) {
-    debug('resume read 0');
-    stream.read(0);
-  }
-
-  state.resumeScheduled = false;
-  stream.emit('resume');
-  flow(stream);
-  if (state.flowing && !state.reading) stream.read(0);
-}
 
-Readable.prototype.pause = function () {
-  debug('call pause flowing=%j', this._readableState.flowing);
-  if (false !== this._readableState.flowing) {
-    debug('pause');
-    this._readableState.flowing = false;
-    this.emit('pause');
-  }
-  return this;
-};
+/* ===========================================================================
+ * Send a literal or distance tree in compressed form, using the codes in
+ * bl_tree.
+ */
+function send_tree(s, tree, max_code)
+//    deflate_state *s;
+//    ct_data *tree; /* the tree to be scanned */
+//    int max_code;       /* and its largest code of non zero frequency */
+{
+  var n;                     /* iterates over all tree elements */
+  var prevlen = -1;          /* last emitted length */
+  var curlen;                /* length of current code */
 
-function flow(stream) {
-  var state = stream._readableState;
-  debug('flow', state.flowing);
-  if (state.flowing) {
-    do {
-      var chunk = stream.read();
-    } while (null !== chunk && state.flowing);
+  var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */
+
+  var count = 0;             /* repeat count of the current code */
+  var max_count = 7;         /* max repeat count */
+  var min_count = 4;         /* min repeat count */
+
+  /* tree[max_code+1].Len = -1; */  /* guard already set */
+  if (nextlen === 0) {
+    max_count = 138;
+    min_count = 3;
   }
-}
 
-// wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function (stream) {
-  var state = this._readableState;
-  var paused = false;
+  for (n = 0; n <= max_code; n++) {
+    curlen = nextlen;
+    nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;
 
-  var self = this;
-  stream.on('end', function () {
-    debug('wrapped end');
-    if (state.decoder && !state.ended) {
-      var chunk = state.decoder.end();
-      if (chunk && chunk.length) self.push(chunk);
-    }
+    if (++count < max_count && curlen === nextlen) {
+      continue;
 
-    self.push(null);
-  });
+    } else if (count < min_count) {
+      do { send_code(s, curlen, s.bl_tree); } while (--count !== 0);
 
-  stream.on('data', function (chunk) {
-    debug('wrapped data');
-    if (state.decoder) chunk = state.decoder.write(chunk);
+    } else if (curlen !== 0) {
+      if (curlen !== prevlen) {
+        send_code(s, curlen, s.bl_tree);
+        count--;
+      }
+      //Assert(count >= 3 && count <= 6, " 3_6?");
+      send_code(s, REP_3_6, s.bl_tree);
+      send_bits(s, count - 3, 2);
 
-    // don't skip over falsy values in objectMode
-    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
+    } else if (count <= 10) {
+      send_code(s, REPZ_3_10, s.bl_tree);
+      send_bits(s, count - 3, 3);
 
-    var ret = self.push(chunk);
-    if (!ret) {
-      paused = true;
-      stream.pause();
+    } else {
+      send_code(s, REPZ_11_138, s.bl_tree);
+      send_bits(s, count - 11, 7);
     }
-  });
 
-  // proxy all the other methods.
-  // important when wrapping filters and duplexes.
-  for (var i in stream) {
-    if (this[i] === undefined && typeof stream[i] === 'function') {
-      this[i] = function (method) {
-        return function () {
-          return stream[method].apply(stream, arguments);
-        };
-      }(i);
+    count = 0;
+    prevlen = curlen;
+    if (nextlen === 0) {
+      max_count = 138;
+      min_count = 3;
+
+    } else if (curlen === nextlen) {
+      max_count = 6;
+      min_count = 3;
+
+    } else {
+      max_count = 7;
+      min_count = 4;
     }
   }
+}
 
-  // proxy certain important events.
-  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-  forEach(events, function (ev) {
-    stream.on(ev, self.emit.bind(self, ev));
-  });
 
-  // when we try to consume some more bytes, simply unpause the
-  // underlying stream.
-  self._read = function (n) {
-    debug('wrapped _read', n);
-    if (paused) {
-      paused = false;
-      stream.resume();
+/* ===========================================================================
+ * Construct the Huffman tree for the bit lengths and return the index in
+ * bl_order of the last bit length code to send.
+ */
+function build_bl_tree(s) {
+  var max_blindex;  /* index of last bit length code of non zero freq */
+
+  /* Determine the bit length frequencies for literal and distance trees */
+  scan_tree(s, s.dyn_ltree, s.l_desc.max_code);
+  scan_tree(s, s.dyn_dtree, s.d_desc.max_code);
+
+  /* Build the bit length tree: */
+  build_tree(s, s.bl_desc);
+  /* opt_len now includes the length of the tree representations, except
+   * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
+   */
+
+  /* Determine the number of bit length codes to send. The pkzip format
+   * requires that at least 4 bit length codes be sent. (appnote.txt says
+   * 3 but the actual value used is 4.)
+   */
+  for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {
+    if (s.bl_tree[bl_order[max_blindex] * 2 + 1]/*.Len*/ !== 0) {
+      break;
     }
-  };
+  }
+  /* Update opt_len to include the bit length tree and counts */
+  s.opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;
+  //Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
+  //        s->opt_len, s->static_len));
 
-  return self;
-};
+  return max_blindex;
+}
 
-// exposed for testing purposes only.
-Readable._fromList = fromList;
 
-// Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-function fromList(n, state) {
-  var list = state.buffer;
-  var length = state.length;
-  var stringMode = !!state.decoder;
-  var objectMode = !!state.objectMode;
-  var ret;
+/* ===========================================================================
+ * Send the header for a block using dynamic Huffman trees: the counts, the
+ * lengths of the bit length codes, the literal tree and the distance tree.
+ * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
+ */
+function send_all_trees(s, lcodes, dcodes, blcodes)
+//    deflate_state *s;
+//    int lcodes, dcodes, blcodes; /* number of codes for each tree */
+{
+  var rank;                    /* index in bl_order */
 
-  // nothing in the list, definitely empty.
-  if (list.length === 0) return null;
+  //Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
+  //Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
+  //        "too many codes");
+  //Tracev((stderr, "\nbl counts: "));
+  send_bits(s, lcodes - 257, 5); /* not +255 as stated in appnote.txt */
+  send_bits(s, dcodes - 1,   5);
+  send_bits(s, blcodes - 4,  4); /* not -3 as stated in appnote.txt */
+  for (rank = 0; rank < blcodes; rank++) {
+    //Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
+    send_bits(s, s.bl_tree[bl_order[rank] * 2 + 1]/*.Len*/, 3);
+  }
+  //Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
 
-  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
-    // read it all, truncate the array.
-    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
-    list.length = 0;
-  } else {
-    // read just some of it.
-    if (n < list[0].length) {
-      // just take a part of the first list item.
-      // slice is the same for buffers and strings.
-      var buf = list[0];
-      ret = buf.slice(0, n);
-      list[0] = buf.slice(n);
-    } else if (n === list[0].length) {
-      // first list is a perfect match
-      ret = list.shift();
-    } else {
-      // complex case.
-      // we have enough to cover it, but it spans past the first buffer.
-      if (stringMode) ret = '';else ret = new Buffer(n);
+  send_tree(s, s.dyn_ltree, lcodes - 1); /* literal tree */
+  //Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
 
-      var c = 0;
-      for (var i = 0, l = list.length; i < l && c < n; i++) {
-        var buf = list[0];
-        var cpy = Math.min(n - c, buf.length);
+  send_tree(s, s.dyn_dtree, dcodes - 1); /* distance tree */
+  //Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
+}
 
-        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);
 
-        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();
+/* ===========================================================================
+ * Check if the data type is TEXT or BINARY, using the following algorithm:
+ * - TEXT if the two conditions below are satisfied:
+ *    a) There are no non-portable control characters belonging to the
+ *       "black list" (0..6, 14..25, 28..31).
+ *    b) There is at least one printable character belonging to the
+ *       "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
+ * - BINARY otherwise.
+ * - The following partially-portable control characters form a
+ *   "gray list" that is ignored in this detection algorithm:
+ *   (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
+ * IN assertion: the fields Freq of dyn_ltree are set.
+ */
+function detect_data_type(s) {
+  /* black_mask is the bit mask of black-listed bytes
+   * set bits 0..6, 14..25, and 28..31
+   * 0xf3ffc07f = binary 11110011111111111100000001111111
+   */
+  var black_mask = 0xf3ffc07f;
+  var n;
 
-        c += cpy;
-      }
+  /* Check for non-textual ("black-listed") bytes. */
+  for (n = 0; n <= 31; n++, black_mask >>>= 1) {
+    if ((black_mask & 1) && (s.dyn_ltree[n * 2]/*.Freq*/ !== 0)) {
+      return Z_BINARY;
     }
   }
 
-  return ret;
+  /* Check for textual ("white-listed") bytes. */
+  if (s.dyn_ltree[9 * 2]/*.Freq*/ !== 0 || s.dyn_ltree[10 * 2]/*.Freq*/ !== 0 ||
+      s.dyn_ltree[13 * 2]/*.Freq*/ !== 0) {
+    return Z_TEXT;
+  }
+  for (n = 32; n < LITERALS; n++) {
+    if (s.dyn_ltree[n * 2]/*.Freq*/ !== 0) {
+      return Z_TEXT;
+    }
+  }
+
+  /* There are no "black-listed" or "white-listed" bytes:
+   * this stream either is empty or has tolerated ("gray-listed") bytes only.
+   */
+  return Z_BINARY;
 }
 
-function endReadable(stream) {
-  var state = stream._readableState;
 
-  // If we get here before consuming all the bytes, then that is a
-  // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('endReadable called on non-empty stream');
+var static_init_done = false;
 
-  if (!state.endEmitted) {
-    state.ended = true;
-    processNextTick(endReadableNT, state, stream);
-  }
-}
+/* ===========================================================================
+ * Initialize the tree data structures for a new zlib stream.
+ */
+function _tr_init(s)
+{
 
-function endReadableNT(state, stream) {
-  // Check that we didn't get one last unshift.
-  if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
-    stream.readable = false;
-    stream.emit('end');
+  if (!static_init_done) {
+    tr_static_init();
+    static_init_done = true;
   }
+
+  s.l_desc  = new TreeDesc(s.dyn_ltree, static_l_desc);
+  s.d_desc  = new TreeDesc(s.dyn_dtree, static_d_desc);
+  s.bl_desc = new TreeDesc(s.bl_tree, static_bl_desc);
+
+  s.bi_buf = 0;
+  s.bi_valid = 0;
+
+  /* Initialize the first block of the first file: */
+  init_block(s);
 }
 
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
+
+/* ===========================================================================
+ * Send a stored block
+ */
+function _tr_stored_block(s, buf, stored_len, last)
+//DeflateState *s;
+//charf *buf;       /* input block */
+//ulg stored_len;   /* length of input block */
+//int last;         /* one if this is the last block for a file */
+{
+  send_bits(s, (STORED_BLOCK << 1) + (last ? 1 : 0), 3);    /* send block type */
+  copy_block(s, buf, stored_len, true); /* with header */
 }
 
-function indexOf(xs, x) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    if (xs[i] === x) return i;
-  }
-  return -1;
+
+/* ===========================================================================
+ * Send one empty static block to give enough lookahead for inflate.
+ * This takes 10 bits, of which 7 may remain in the bit buffer.
+ */
+function _tr_align(s) {
+  send_bits(s, STATIC_TREES << 1, 3);
+  send_code(s, END_BLOCK, static_ltree);
+  bi_flush(s);
 }
-}).call(this,_dereq_('_process'))
 
-},{"./_stream_duplex":176,"_process":8,"buffer":2,"core-util-is":181,"events":6,"inherits":182,"isarray":183,"process-nextick-args":184,"string_decoder/":185,"util":1}],179:[function(_dereq_,module,exports){
-// a transform stream is a readable/writable stream where you do
-// something with the data.  Sometimes it's called a "filter",
-// but that's not a great name for it, since that implies a thing where
-// some bits pass through, and others are simply ignored.  (That would
-// be a valid example of a transform, of course.)
-//
-// While the output is causally related to the input, it's not a
-// necessarily symmetric or synchronous transformation.  For example,
-// a zlib stream might take multiple plain-text writes(), and then
-// emit a single compressed chunk some time in the future.
-//
-// Here's how this works:
-//
-// The Transform stream has all the aspects of the readable and writable
-// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-// internally, and returns false if there's a lot of pending writes
-// buffered up.  When you call read(), that calls _read(n) until
-// there's enough pending readable data buffered up.
-//
-// In a transform stream, the written data is placed in a buffer.  When
-// _read(n) is called, it transforms the queued up data, calling the
-// buffered _write cb's as it consumes chunks.  If consuming a single
-// written chunk would result in multiple output chunks, then the first
-// outputted bit calls the readcb, and subsequent chunks just go into
-// the read buffer, and will cause it to emit 'readable' if necessary.
-//
-// This way, back-pressure is actually determined by the reading side,
-// since _read has to be called to start processing a new chunk.  However,
-// a pathological inflate type of transform can cause excessive buffering
-// here.  For example, imagine a stream where every byte of input is
-// interpreted as an integer from 0-255, and then results in that many
-// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-// 1kb of data being output.  In this case, you could write a very small
-// amount of input, and end up with a very large amount of output.  In
-// such a pathological inflating mechanism, there'd be no way to tell
-// the system to stop doing the transform.  A single 4MB write could
-// cause the system to run out of memory.
-//
-// However, even in such a pathological case, only a single written chunk
-// would be consumed, and then the rest would wait (un-transformed) until
-// the results of the previous transformed chunk were consumed.
 
-'use strict';
+/* ===========================================================================
+ * Determine the best encoding for the current block: dynamic trees, static
+ * trees or store, and output the encoded block to the zip file.
+ */
+function _tr_flush_block(s, buf, stored_len, last)
+//DeflateState *s;
+//charf *buf;       /* input block, or NULL if too old */
+//ulg stored_len;   /* length of input block */
+//int last;         /* one if this is the last block for a file */
+{
+  var opt_lenb, static_lenb;  /* opt_len and static_len in bytes */
+  var max_blindex = 0;        /* index of last bit length code of non zero freq */
 
-module.exports = Transform;
+  /* Build the Huffman trees unless a stored block is forced */
+  if (s.level > 0) {
 
-var Duplex = _dereq_('./_stream_duplex');
+    /* Check if the file is binary or text */
+    if (s.strm.data_type === Z_UNKNOWN) {
+      s.strm.data_type = detect_data_type(s);
+    }
 
-/*<replacement>*/
-var util = _dereq_('core-util-is');
-util.inherits = _dereq_('inherits');
-/*</replacement>*/
+    /* Construct the literal and distance trees */
+    build_tree(s, s.l_desc);
+    // Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
+    //        s->static_len));
 
-util.inherits(Transform, Duplex);
+    build_tree(s, s.d_desc);
+    // Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
+    //        s->static_len));
+    /* At this point, opt_len and static_len are the total bit lengths of
+     * the compressed block data, excluding the tree representations.
+     */
 
-function TransformState(stream) {
-  this.afterTransform = function (er, data) {
-    return afterTransform(stream, er, data);
-  };
+    /* Build the bit length tree for the above two trees, and get the index
+     * in bl_order of the last bit length code to send.
+     */
+    max_blindex = build_bl_tree(s);
 
-  this.needTransform = false;
-  this.transforming = false;
-  this.writecb = null;
-  this.writechunk = null;
-  this.writeencoding = null;
-}
+    /* Determine the best encoding. Compute the block lengths in bytes. */
+    opt_lenb = (s.opt_len + 3 + 7) >>> 3;
+    static_lenb = (s.static_len + 3 + 7) >>> 3;
 
-function afterTransform(stream, er, data) {
-  var ts = stream._transformState;
-  ts.transforming = false;
+    // Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
+    //        opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
+    //        s->last_lit));
 
-  var cb = ts.writecb;
+    if (static_lenb <= opt_lenb) { opt_lenb = static_lenb; }
 
-  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
+  } else {
+    // Assert(buf != (char*)0, "lost buf");
+    opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
+  }
 
-  ts.writechunk = null;
-  ts.writecb = null;
+  if ((stored_len + 4 <= opt_lenb) && (buf !== -1)) {
+    /* 4: two words for the lengths */
 
-  if (data !== null && data !== undefined) stream.push(data);
+    /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
+     * Otherwise we can't have processed more than WSIZE input bytes since
+     * the last block flush, because compression would have been
+     * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
+     * transform a block into a stored block.
+     */
+    _tr_stored_block(s, buf, stored_len, last);
 
-  cb(er);
+  } else if (s.strategy === Z_FIXED || static_lenb === opt_lenb) {
 
-  var rs = stream._readableState;
-  rs.reading = false;
-  if (rs.needReadable || rs.length < rs.highWaterMark) {
-    stream._read(rs.highWaterMark);
+    send_bits(s, (STATIC_TREES << 1) + (last ? 1 : 0), 3);
+    compress_block(s, static_ltree, static_dtree);
+
+  } else {
+    send_bits(s, (DYN_TREES << 1) + (last ? 1 : 0), 3);
+    send_all_trees(s, s.l_desc.max_code + 1, s.d_desc.max_code + 1, max_blindex + 1);
+    compress_block(s, s.dyn_ltree, s.dyn_dtree);
+  }
+  // Assert (s->compressed_len == s->bits_sent, "bad compressed size");
+  /* The above check is made mod 2^32, for files larger than 512 MB
+   * and uLong implemented on 32 bits.
+   */
+  init_block(s);
+
+  if (last) {
+    bi_windup(s);
   }
+  // Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
+  //       s->compressed_len-7*last));
 }
 
-function Transform(options) {
-  if (!(this instanceof Transform)) return new Transform(options);
+/* ===========================================================================
+ * Save the match info and tally the frequency counts. Return true if
+ * the current block must be flushed.
+ */
+function _tr_tally(s, dist, lc)
+//    deflate_state *s;
+//    unsigned dist;  /* distance of matched string */
+//    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
+{
+  //var out_length, in_length, dcode;
 
-  Duplex.call(this, options);
+  s.pending_buf[s.d_buf + s.last_lit * 2]     = (dist >>> 8) & 0xff;
+  s.pending_buf[s.d_buf + s.last_lit * 2 + 1] = dist & 0xff;
 
-  this._transformState = new TransformState(this);
+  s.pending_buf[s.l_buf + s.last_lit] = lc & 0xff;
+  s.last_lit++;
 
-  // when the writable side finishes, then flush out anything remaining.
-  var stream = this;
+  if (dist === 0) {
+    /* lc is the unmatched char */
+    s.dyn_ltree[lc * 2]/*.Freq*/++;
+  } else {
+    s.matches++;
+    /* Here, lc is the match length - MIN_MATCH */
+    dist--;             /* dist = match distance - 1 */
+    //Assert((ush)dist < (ush)MAX_DIST(s) &&
+    //       (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
+    //       (ush)d_code(dist) < (ush)D_CODES,  "_tr_tally: bad match");
 
-  // start out asking for a readable event once data is transformed.
-  this._readableState.needReadable = true;
+    s.dyn_ltree[(_length_code[lc] + LITERALS + 1) * 2]/*.Freq*/++;
+    s.dyn_dtree[d_code(dist) * 2]/*.Freq*/++;
+  }
+
+// (!) This block is disabled in zlib defailts,
+// don't enable it for binary compatibility
+
+//#ifdef TRUNCATE_BLOCK
+//  /* Try to guess if it is profitable to stop the current block here */
+//  if ((s.last_lit & 0x1fff) === 0 && s.level > 2) {
+//    /* Compute an upper bound for the compressed length */
+//    out_length = s.last_lit*8;
+//    in_length = s.strstart - s.block_start;
+//
+//    for (dcode = 0; dcode < D_CODES; dcode++) {
+//      out_length += s.dyn_dtree[dcode*2]/*.Freq*/ * (5 + extra_dbits[dcode]);
+//    }
+//    out_length >>>= 3;
+//    //Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
+//    //       s->last_lit, in_length, out_length,
+//    //       100L - out_length*100L/in_length));
+//    if (s.matches < (s.last_lit>>1)/*int /2*/ && out_length < (in_length>>1)/*int /2*/) {
+//      return true;
+//    }
+//  }
+//#endif
+
+  return (s.last_lit === s.lit_bufsize - 1);
+  /* We avoid equality with lit_bufsize because of wraparound at 64K
+   * on 16 bit machines and because stored blocks are restricted to
+   * 64K-1 bytes.
+   */
+}
 
-  // we have implemented the _read method, and done the other things
-  // that Readable wants before the first _read call, so unset the
-  // sync guard flag.
-  this._readableState.sync = false;
+exports._tr_init  = _tr_init;
+exports._tr_stored_block = _tr_stored_block;
+exports._tr_flush_block  = _tr_flush_block;
+exports._tr_tally = _tr_tally;
+exports._tr_align = _tr_align;
 
-  if (options) {
-    if (typeof options.transform === 'function') this._transform = options.transform;
+},{"../utils/common":167}],179:[function(_dereq_,module,exports){
+'use strict';
 
-    if (typeof options.flush === 'function') this._flush = options.flush;
-  }
 
-  this.once('prefinish', function () {
-    if (typeof this._flush === 'function') this._flush(function (er) {
-      done(stream, er);
-    });else done(stream);
-  });
+function ZStream() {
+  /* next input byte */
+  this.input = null; // JS specific, because we have no pointers
+  this.next_in = 0;
+  /* number of bytes available at input */
+  this.avail_in = 0;
+  /* total number of input bytes read so far */
+  this.total_in = 0;
+  /* next output byte should be put there */
+  this.output = null; // JS specific, because we have no pointers
+  this.next_out = 0;
+  /* remaining free space at output */
+  this.avail_out = 0;
+  /* total number of bytes output so far */
+  this.total_out = 0;
+  /* last error message, NULL if no error */
+  this.msg = ''/*Z_NULL*/;
+  /* not visible by applications */
+  this.state = null;
+  /* best guess about the data type: binary or text */
+  this.data_type = 2/*Z_UNKNOWN*/;
+  /* adler32 value of the uncompressed data */
+  this.adler = 0;
 }
 
-Transform.prototype.push = function (chunk, encoding) {
-  this._transformState.needTransform = false;
-  return Duplex.prototype.push.call(this, chunk, encoding);
-};
-
-// This is the part where you do stuff!
-// override this function in implementation classes.
-// 'chunk' is an input chunk.
-//
-// Call `push(newChunk)` to pass along transformed output
-// to the readable side.  You may call 'push' zero or more times.
-//
-// Call `cb(err)` when you are done with this chunk.  If you pass
-// an error, then that'll put the hurt on the whole operation.  If you
-// never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('not implemented');
-};
+module.exports = ZStream;
 
-Transform.prototype._write = function (chunk, encoding, cb) {
-  var ts = this._transformState;
-  ts.writecb = cb;
-  ts.writechunk = chunk;
-  ts.writeencoding = encoding;
-  if (!ts.transforming) {
-    var rs = this._readableState;
-    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-  }
-};
+},{}],180:[function(_dereq_,module,exports){
+'use strict';
 
-// Doesn't matter what the args are here.
-// _transform does all the work.
-// That we got here means that the readable side wants more data.
-Transform.prototype._read = function (n) {
-  var ts = this._transformState;
+// lightweight Buffer shim for pbf browser build
+// based on code from github.com/feross/buffer (MIT-licensed)
 
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-    ts.transforming = true;
-    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-  } else {
-    // mark that we need a transform, so that any data that comes in
-    // will get processed, now that we've asked for it.
-    ts.needTransform = true;
-  }
-};
+module.exports = Buffer;
 
-function done(stream, er) {
-  if (er) return stream.emit('error', er);
+var ieee754 = _dereq_('ieee754');
 
-  // if there's nothing in the write buffer, then that means
-  // that nothing more will ever be provided
-  var ws = stream._writableState;
-  var ts = stream._transformState;
+var BufferMethods;
 
-  if (ws.length) throw new Error('calling transform done when ws.length != 0');
+function Buffer(length) {
+    var arr;
+    if (length && length.length) {
+        arr = length;
+        length = arr.length;
+    }
+    var buf = new Uint8Array(length || 0);
+    if (arr) buf.set(arr);
 
-  if (ts.transforming) throw new Error('calling transform done when still transforming');
+    buf.readUInt32LE = BufferMethods.readUInt32LE;
+    buf.writeUInt32LE = BufferMethods.writeUInt32LE;
+    buf.readInt32LE = BufferMethods.readInt32LE;
+    buf.writeInt32LE = BufferMethods.writeInt32LE;
+    buf.readFloatLE = BufferMethods.readFloatLE;
+    buf.writeFloatLE = BufferMethods.writeFloatLE;
+    buf.readDoubleLE = BufferMethods.readDoubleLE;
+    buf.writeDoubleLE = BufferMethods.writeDoubleLE;
+    buf.toString = BufferMethods.toString;
+    buf.write = BufferMethods.write;
+    buf.slice = BufferMethods.slice;
+    buf.copy = BufferMethods.copy;
 
-  return stream.push(null);
+    buf._isBuffer = true;
+    return buf;
 }
-},{"./_stream_duplex":176,"core-util-is":181,"inherits":182}],180:[function(_dereq_,module,exports){
-(function (process){
-// A bit simpler than readable streams.
-// Implement an async ._write(chunk, encoding, cb), and it'll handle all
-// the drain event emission and buffering.
 
-'use strict';
+var lastStr, lastStrEncoded;
 
-module.exports = Writable;
+BufferMethods = {
+    readUInt32LE: function(pos) {
+        return ((this[pos]) |
+            (this[pos + 1] << 8) |
+            (this[pos + 2] << 16)) +
+            (this[pos + 3] * 0x1000000);
+    },
 
-/*<replacement>*/
-var processNextTick = _dereq_('process-nextick-args');
-/*</replacement>*/
+    writeUInt32LE: function(val, pos) {
+        this[pos] = val;
+        this[pos + 1] = (val >>> 8);
+        this[pos + 2] = (val >>> 16);
+        this[pos + 3] = (val >>> 24);
+    },
 
-/*<replacement>*/
-var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
-/*</replacement>*/
+    readInt32LE: function(pos) {
+        return ((this[pos]) |
+            (this[pos + 1] << 8) |
+            (this[pos + 2] << 16)) +
+            (this[pos + 3] << 24);
+    },
 
-/*<replacement>*/
-var Buffer = _dereq_('buffer').Buffer;
-/*</replacement>*/
+    readFloatLE:  function(pos) { return ieee754.read(this, pos, true, 23, 4); },
+    readDoubleLE: function(pos) { return ieee754.read(this, pos, true, 52, 8); },
 
-Writable.WritableState = WritableState;
+    writeFloatLE:  function(val, pos) { return ieee754.write(this, val, pos, true, 23, 4); },
+    writeDoubleLE: function(val, pos) { return ieee754.write(this, val, pos, true, 52, 8); },
 
-/*<replacement>*/
-var util = _dereq_('core-util-is');
-util.inherits = _dereq_('inherits');
-/*</replacement>*/
+    toString: function(encoding, start, end) {
+        var str = '',
+            tmp = '';
 
-/*<replacement>*/
-var internalUtil = {
-  deprecate: _dereq_('util-deprecate')
-};
-/*</replacement>*/
+        start = start || 0;
+        end = Math.min(this.length, end || this.length);
 
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = _dereq_('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = _dereq_('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
+        for (var i = start; i < end; i++) {
+            var ch = this[i];
+            if (ch <= 0x7F) {
+                str += decodeURIComponent(tmp) + String.fromCharCode(ch);
+                tmp = '';
+            } else {
+                tmp += '%' + ch.toString(16);
+            }
+        }
 
-var Buffer = _dereq_('buffer').Buffer;
+        str += decodeURIComponent(tmp);
 
-util.inherits(Writable, Stream);
+        return str;
+    },
 
-function nop() {}
+    write: function(str, pos) {
+        var bytes = str === lastStr ? lastStrEncoded : encodeString(str);
+        for (var i = 0; i < bytes.length; i++) {
+            this[pos + i] = bytes[i];
+        }
+    },
 
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
+    slice: function(start, end) {
+        return this.subarray(start, end);
+    },
 
-var Duplex;
-function WritableState(options, stream) {
-  Duplex = Duplex || _dereq_('./_stream_duplex');
+    copy: function(buf, pos) {
+        pos = pos || 0;
+        for (var i = 0; i < this.length; i++) {
+            buf[pos + i] = this[i];
+        }
+    }
+};
 
-  options = options || {};
+BufferMethods.writeInt32LE = BufferMethods.writeUInt32LE;
 
-  // object stream flag to indicate whether or not this stream
-  // contains buffers or objects.
-  this.objectMode = !!options.objectMode;
+Buffer.byteLength = function(str) {
+    lastStr = str;
+    lastStrEncoded = encodeString(str);
+    return lastStrEncoded.length;
+};
 
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
+Buffer.isBuffer = function(buf) {
+    return !!(buf && buf._isBuffer);
+};
 
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
+function encodeString(str) {
+    var length = str.length,
+        bytes = [];
 
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
+    for (var i = 0, c, lead; i < length; i++) {
+        c = str.charCodeAt(i); // code point
 
-  this.needDrain = false;
-  // at the start of calling end()
-  this.ending = false;
-  // when end() has been called, and returned
-  this.ended = false;
-  // when 'finish' is emitted
-  this.finished = false;
+        if (c > 0xD7FF && c < 0xE000) {
 
-  // should we decode strings into buffers before passing to _write?
-  // this is here so that some node-core streams can optimize string
-  // handling at a lower level.
-  var noDecode = options.decodeStrings === false;
-  this.decodeStrings = !noDecode;
+            if (lead) {
+                if (c < 0xDC00) {
+                    bytes.push(0xEF, 0xBF, 0xBD);
+                    lead = c;
+                    continue;
 
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
+                } else {
+                    c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
+                    lead = null;
+                }
 
-  // not an actual buffer we keep track of, but a measurement
-  // of how much we're waiting to get pushed to some underlying
-  // socket or file.
-  this.length = 0;
+            } else {
+                if (c > 0xDBFF || (i + 1 === length)) bytes.push(0xEF, 0xBF, 0xBD);
+                else lead = c;
 
-  // a flag to see when we're in the middle of a write.
-  this.writing = false;
+                continue;
+            }
 
-  // when true all writes will be buffered until .uncork() call
-  this.corked = 0;
+        } else if (lead) {
+            bytes.push(0xEF, 0xBF, 0xBD);
+            lead = null;
+        }
 
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
+        if (c < 0x80) bytes.push(c);
+        else if (c < 0x800) bytes.push(c >> 0x6 | 0xC0, c & 0x3F | 0x80);
+        else if (c < 0x10000) bytes.push(c >> 0xC | 0xE0, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
+        else bytes.push(c >> 0x12 | 0xF0, c >> 0xC & 0x3F | 0x80, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
+    }
+    return bytes;
+}
 
-  // a flag to know if we're processing previously buffered items, which
-  // may call the _write() callback in the same tick, so that we don't
-  // end up in an overlapped onwrite situation.
-  this.bufferProcessing = false;
+},{"ieee754":93}],181:[function(_dereq_,module,exports){
+(function (global){
+'use strict';
 
-  // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function (er) {
-    onwrite(stream, er);
-  };
+module.exports = Pbf;
 
-  // the callback that the user supplies to write(chunk,encoding,cb)
-  this.writecb = null;
+var Buffer = global.Buffer || _dereq_('./buffer');
 
-  // the amount that is being written when _write is called.
-  this.writelen = 0;
+function Pbf(buf) {
+    this.buf = !Buffer.isBuffer(buf) ? new Buffer(buf || 0) : buf;
+    this.pos = 0;
+    this.length = this.buf.length;
+}
 
-  this.bufferedRequest = null;
-  this.lastBufferedRequest = null;
+Pbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
+Pbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64
+Pbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
+Pbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32
 
-  // number of pending user-supplied write callbacks
-  // this must be 0 before 'finish' can be emitted
-  this.pendingcb = 0;
+var SHIFT_LEFT_32 = (1 << 16) * (1 << 16),
+    SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32,
+    POW_2_63 = Math.pow(2, 63);
 
-  // emit prefinish if the only thing we're waiting for is _write cbs
-  // This is relevant for synchronous Transform streams
-  this.prefinished = false;
+Pbf.prototype = {
 
-  // True if the error was already emitted and should not be thrown again
-  this.errorEmitted = false;
+    destroy: function() {
+        this.buf = null;
+    },
 
-  // count buffered requests
-  this.bufferedRequestCount = 0;
+    // === READING =================================================================
 
-  // create the two objects needed to store the corked requests
-  // they are not a linked list, as no new elements are inserted in there
-  this.corkedRequestsFree = new CorkedRequest(this);
-  this.corkedRequestsFree.next = new CorkedRequest(this);
-}
+    readFields: function(readField, result, end) {
+        end = end || this.length;
 
-WritableState.prototype.getBuffer = function writableStateGetBuffer() {
-  var current = this.bufferedRequest;
-  var out = [];
-  while (current) {
-    out.push(current);
-    current = current.next;
-  }
-  return out;
-};
+        while (this.pos < end) {
+            var val = this.readVarint(),
+                tag = val >> 3,
+                startPos = this.pos;
 
-(function () {
-  try {
-    Object.defineProperty(WritableState.prototype, 'buffer', {
-      get: internalUtil.deprecate(function () {
-        return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
-    });
-  } catch (_) {}
-})();
+            readField(tag, result, this);
 
-var Duplex;
-function Writable(options) {
-  Duplex = Duplex || _dereq_('./_stream_duplex');
+            if (this.pos === startPos) this.skip(val);
+        }
+        return result;
+    },
 
-  // Writable ctor is applied to Duplexes, though they're not
-  // instanceof Writable, they're instanceof Readable.
-  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
+    readMessage: function(readField, result) {
+        return this.readFields(readField, result, this.readVarint() + this.pos);
+    },
 
-  this._writableState = new WritableState(options, this);
+    readFixed32: function() {
+        var val = this.buf.readUInt32LE(this.pos);
+        this.pos += 4;
+        return val;
+    },
 
-  // legacy.
-  this.writable = true;
+    readSFixed32: function() {
+        var val = this.buf.readInt32LE(this.pos);
+        this.pos += 4;
+        return val;
+    },
 
-  if (options) {
-    if (typeof options.write === 'function') this._write = options.write;
+    // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)
 
-    if (typeof options.writev === 'function') this._writev = options.writev;
-  }
+    readFixed64: function() {
+        var val = this.buf.readUInt32LE(this.pos) + this.buf.readUInt32LE(this.pos + 4) * SHIFT_LEFT_32;
+        this.pos += 8;
+        return val;
+    },
 
-  Stream.call(this);
-}
+    readSFixed64: function() {
+        var val = this.buf.readUInt32LE(this.pos) + this.buf.readInt32LE(this.pos + 4) * SHIFT_LEFT_32;
+        this.pos += 8;
+        return val;
+    },
 
-// Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe. Not readable.'));
-};
+    readFloat: function() {
+        var val = this.buf.readFloatLE(this.pos);
+        this.pos += 4;
+        return val;
+    },
 
-function writeAfterEnd(stream, cb) {
-  var er = new Error('write after end');
-  // TODO: defer error events consistently everywhere, not just the cb
-  stream.emit('error', er);
-  processNextTick(cb, er);
-}
+    readDouble: function() {
+        var val = this.buf.readDoubleLE(this.pos);
+        this.pos += 8;
+        return val;
+    },
 
-// If we get something that is not a buffer, string, null, or undefined,
-// and we're not in objectMode, then that's an error.
-// Otherwise stream chunks are all considered to be of length=1, and the
-// watermarks determine how many objects to keep in the buffer, rather than
-// how many bytes or characters.
-function validChunk(stream, state, chunk, cb) {
-  var valid = true;
+    readVarint: function() {
+        var buf = this.buf,
+            val, b;
 
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    var er = new TypeError('Invalid non-string/buffer chunk');
-    stream.emit('error', er);
-    processNextTick(cb, er);
-    valid = false;
-  }
-  return valid;
-}
+        b = buf[this.pos++]; val  =  b & 0x7f;        if (b < 0x80) return val;
+        b = buf[this.pos++]; val |= (b & 0x7f) << 7;  if (b < 0x80) return val;
+        b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;
+        b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;
 
-Writable.prototype.write = function (chunk, encoding, cb) {
-  var state = this._writableState;
-  var ret = false;
+        return readVarintRemainder(val, this);
+    },
 
-  if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
+    readVarint64: function() {
+        var startPos = this.pos,
+            val = this.readVarint();
 
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
+        if (val < POW_2_63) return val;
 
-  if (typeof cb !== 'function') cb = nop;
+        var pos = this.pos - 2;
+        while (this.buf[pos] === 0xff) pos--;
+        if (pos < startPos) pos = startPos;
 
-  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
-    state.pendingcb++;
-    ret = writeOrBuffer(this, state, chunk, encoding, cb);
-  }
+        val = 0;
+        for (var i = 0; i < pos - startPos + 1; i++) {
+            var b = ~this.buf[startPos + i] & 0x7f;
+            val += i < 4 ? b << i * 7 : b * Math.pow(2, i * 7);
+        }
 
-  return ret;
-};
+        return -val - 1;
+    },
 
-Writable.prototype.cork = function () {
-  var state = this._writableState;
+    readSVarint: function() {
+        var num = this.readVarint();
+        return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
+    },
+
+    readBoolean: function() {
+        return Boolean(this.readVarint());
+    },
 
-  state.corked++;
-};
+    readString: function() {
+        var end = this.readVarint() + this.pos,
+            str = this.buf.toString('utf8', this.pos, end);
+        this.pos = end;
+        return str;
+    },
 
-Writable.prototype.uncork = function () {
-  var state = this._writableState;
+    readBytes: function() {
+        var end = this.readVarint() + this.pos,
+            buffer = this.buf.slice(this.pos, end);
+        this.pos = end;
+        return buffer;
+    },
 
-  if (state.corked) {
-    state.corked--;
+    // verbose for performance reasons; doesn't affect gzipped size
 
-    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-  }
-};
+    readPackedVarint: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readVarint());
+        return arr;
+    },
+    readPackedSVarint: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readSVarint());
+        return arr;
+    },
+    readPackedBoolean: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readBoolean());
+        return arr;
+    },
+    readPackedFloat: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readFloat());
+        return arr;
+    },
+    readPackedDouble: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readDouble());
+        return arr;
+    },
+    readPackedFixed32: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readFixed32());
+        return arr;
+    },
+    readPackedSFixed32: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readSFixed32());
+        return arr;
+    },
+    readPackedFixed64: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readFixed64());
+        return arr;
+    },
+    readPackedSFixed64: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readSFixed64());
+        return arr;
+    },
 
-Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-  // node::ParseEncoding() requires lower case.
-  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-  this._writableState.defaultEncoding = encoding;
-};
+    skip: function(val) {
+        var type = val & 0x7;
+        if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}
+        else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;
+        else if (type === Pbf.Fixed32) this.pos += 4;
+        else if (type === Pbf.Fixed64) this.pos += 8;
+        else throw new Error('Unimplemented type: ' + type);
+    },
 
-function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = new Buffer(chunk, encoding);
-  }
-  return chunk;
-}
+    // === WRITING =================================================================
 
-// if we're already writing something, then just put this
-// in the queue, and wait our turn.  Otherwise, call _write
-// If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, chunk, encoding, cb) {
-  chunk = decodeChunk(state, chunk, encoding);
+    writeTag: function(tag, type) {
+        this.writeVarint((tag << 3) | type);
+    },
 
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
-  var len = state.objectMode ? 1 : chunk.length;
+    realloc: function(min) {
+        var length = this.length || 16;
 
-  state.length += len;
+        while (length < this.pos + min) length *= 2;
 
-  var ret = state.length < state.highWaterMark;
-  // we must ensure that previous needDrain will not be reset to false.
-  if (!ret) state.needDrain = true;
+        if (length !== this.length) {
+            var buf = new Buffer(length);
+            this.buf.copy(buf);
+            this.buf = buf;
+            this.length = length;
+        }
+    },
 
-  if (state.writing || state.corked) {
-    var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
-    if (last) {
-      last.next = state.lastBufferedRequest;
-    } else {
-      state.bufferedRequest = state.lastBufferedRequest;
-    }
-    state.bufferedRequestCount += 1;
-  } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
-  }
+    finish: function() {
+        this.length = this.pos;
+        this.pos = 0;
+        return this.buf.slice(0, this.length);
+    },
 
-  return ret;
-}
+    writeFixed32: function(val) {
+        this.realloc(4);
+        this.buf.writeUInt32LE(val, this.pos);
+        this.pos += 4;
+    },
 
-function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-  state.writelen = len;
-  state.writecb = cb;
-  state.writing = true;
-  state.sync = true;
-  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-  state.sync = false;
-}
+    writeSFixed32: function(val) {
+        this.realloc(4);
+        this.buf.writeInt32LE(val, this.pos);
+        this.pos += 4;
+    },
 
-function onwriteError(stream, state, sync, er, cb) {
-  --state.pendingcb;
-  if (sync) processNextTick(cb, er);else cb(er);
+    writeFixed64: function(val) {
+        this.realloc(8);
+        this.buf.writeInt32LE(val & -1, this.pos);
+        this.buf.writeUInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
+        this.pos += 8;
+    },
 
-  stream._writableState.errorEmitted = true;
-  stream.emit('error', er);
-}
+    writeSFixed64: function(val) {
+        this.realloc(8);
+        this.buf.writeInt32LE(val & -1, this.pos);
+        this.buf.writeInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
+        this.pos += 8;
+    },
 
-function onwriteStateUpdate(state) {
-  state.writing = false;
-  state.writecb = null;
-  state.length -= state.writelen;
-  state.writelen = 0;
-}
+    writeVarint: function(val) {
+        val = +val;
 
-function onwrite(stream, er) {
-  var state = stream._writableState;
-  var sync = state.sync;
-  var cb = state.writecb;
+        if (val > 0xfffffff) {
+            writeBigVarint(val, this);
+            return;
+        }
 
-  onwriteStateUpdate(state);
+        this.realloc(4);
 
-  if (er) onwriteError(stream, state, sync, er, cb);else {
-    // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(state);
+        this.buf[this.pos++] =           val & 0x7f  | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
+        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
+        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
+        this.buf[this.pos++] =   (val >>> 7) & 0x7f;
+    },
 
-    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-      clearBuffer(stream, state);
-    }
+    writeSVarint: function(val) {
+        this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
+    },
 
-    if (sync) {
-      /*<replacement>*/
-      asyncWrite(afterWrite, stream, state, finished, cb);
-      /*</replacement>*/
-    } else {
-        afterWrite(stream, state, finished, cb);
-      }
-  }
-}
+    writeBoolean: function(val) {
+        this.writeVarint(Boolean(val));
+    },
 
-function afterWrite(stream, state, finished, cb) {
-  if (!finished) onwriteDrain(stream, state);
-  state.pendingcb--;
-  cb();
-  finishMaybe(stream, state);
-}
+    writeString: function(str) {
+        str = String(str);
+        var bytes = Buffer.byteLength(str);
+        this.writeVarint(bytes);
+        this.realloc(bytes);
+        this.buf.write(str, this.pos);
+        this.pos += bytes;
+    },
 
-// Must force callback to be called on nextTick, so that we don't
-// emit 'drain' before the write() consumer gets the 'false' return
-// value, and has a chance to attach a 'drain' listener.
-function onwriteDrain(stream, state) {
-  if (state.length === 0 && state.needDrain) {
-    state.needDrain = false;
-    stream.emit('drain');
-  }
-}
+    writeFloat: function(val) {
+        this.realloc(4);
+        this.buf.writeFloatLE(val, this.pos);
+        this.pos += 4;
+    },
 
-// if there's something in the buffer waiting, then process it
-function clearBuffer(stream, state) {
-  state.bufferProcessing = true;
-  var entry = state.bufferedRequest;
+    writeDouble: function(val) {
+        this.realloc(8);
+        this.buf.writeDoubleLE(val, this.pos);
+        this.pos += 8;
+    },
 
-  if (stream._writev && entry && entry.next) {
-    // Fast case, write everything using _writev()
-    var l = state.bufferedRequestCount;
-    var buffer = new Array(l);
-    var holder = state.corkedRequestsFree;
-    holder.entry = entry;
+    writeBytes: function(buffer) {
+        var len = buffer.length;
+        this.writeVarint(len);
+        this.realloc(len);
+        for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];
+    },
 
-    var count = 0;
-    while (entry) {
-      buffer[count] = entry;
-      entry = entry.next;
-      count += 1;
-    }
+    writeRawMessage: function(fn, obj) {
+        this.pos++; // reserve 1 byte for short message length
 
-    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
+        // write the message directly to the buffer and see how much was written
+        var startPos = this.pos;
+        fn(obj, this);
+        var len = this.pos - startPos;
 
-    // doWrite is always async, defer these to save a bit of time
-    // as the hot path ends with doWrite
-    state.pendingcb++;
-    state.lastBufferedRequest = null;
-    state.corkedRequestsFree = holder.next;
-    holder.next = null;
-  } else {
-    // Slow case, write chunks one-by-one
-    while (entry) {
-      var chunk = entry.chunk;
-      var encoding = entry.encoding;
-      var cb = entry.callback;
-      var len = state.objectMode ? 1 : chunk.length;
+        if (len >= 0x80) reallocForRawMessage(startPos, len, this);
 
-      doWrite(stream, state, false, len, chunk, encoding, cb);
-      entry = entry.next;
-      // if we didn't call the onwrite immediately, then
-      // it means that we need to wait until it does.
-      // also, that means that the chunk and cb are currently
-      // being processed, so move the buffer counter past them.
-      if (state.writing) {
-        break;
-      }
-    }
+        // finally, write the message length in the reserved place and restore the position
+        this.pos = startPos - 1;
+        this.writeVarint(len);
+        this.pos += len;
+    },
 
-    if (entry === null) state.lastBufferedRequest = null;
-  }
+    writeMessage: function(tag, fn, obj) {
+        this.writeTag(tag, Pbf.Bytes);
+        this.writeRawMessage(fn, obj);
+    },
 
-  state.bufferedRequestCount = 0;
-  state.bufferedRequest = entry;
-  state.bufferProcessing = false;
-}
+    writePackedVarint:   function(tag, arr) { this.writeMessage(tag, writePackedVarint, arr);   },
+    writePackedSVarint:  function(tag, arr) { this.writeMessage(tag, writePackedSVarint, arr);  },
+    writePackedBoolean:  function(tag, arr) { this.writeMessage(tag, writePackedBoolean, arr);  },
+    writePackedFloat:    function(tag, arr) { this.writeMessage(tag, writePackedFloat, arr);    },
+    writePackedDouble:   function(tag, arr) { this.writeMessage(tag, writePackedDouble, arr);   },
+    writePackedFixed32:  function(tag, arr) { this.writeMessage(tag, writePackedFixed32, arr);  },
+    writePackedSFixed32: function(tag, arr) { this.writeMessage(tag, writePackedSFixed32, arr); },
+    writePackedFixed64:  function(tag, arr) { this.writeMessage(tag, writePackedFixed64, arr);  },
+    writePackedSFixed64: function(tag, arr) { this.writeMessage(tag, writePackedSFixed64, arr); },
 
-Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('not implemented'));
+    writeBytesField: function(tag, buffer) {
+        this.writeTag(tag, Pbf.Bytes);
+        this.writeBytes(buffer);
+    },
+    writeFixed32Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed32);
+        this.writeFixed32(val);
+    },
+    writeSFixed32Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed32);
+        this.writeSFixed32(val);
+    },
+    writeFixed64Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed64);
+        this.writeFixed64(val);
+    },
+    writeSFixed64Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed64);
+        this.writeSFixed64(val);
+    },
+    writeVarintField: function(tag, val) {
+        this.writeTag(tag, Pbf.Varint);
+        this.writeVarint(val);
+    },
+    writeSVarintField: function(tag, val) {
+        this.writeTag(tag, Pbf.Varint);
+        this.writeSVarint(val);
+    },
+    writeStringField: function(tag, str) {
+        this.writeTag(tag, Pbf.Bytes);
+        this.writeString(str);
+    },
+    writeFloatField: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed32);
+        this.writeFloat(val);
+    },
+    writeDoubleField: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed64);
+        this.writeDouble(val);
+    },
+    writeBooleanField: function(tag, val) {
+        this.writeVarintField(tag, Boolean(val));
+    }
 };
 
-Writable.prototype._writev = null;
-
-Writable.prototype.end = function (chunk, encoding, cb) {
-  var state = this._writableState;
+function readVarintRemainder(val, pbf) {
+    var buf = pbf.buf, b;
 
-  if (typeof chunk === 'function') {
-    cb = chunk;
-    chunk = null;
-    encoding = null;
-  } else if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
+    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x10000000;         if (b < 0x80) return val;
+    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x800000000;        if (b < 0x80) return val;
+    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x40000000000;      if (b < 0x80) return val;
+    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x2000000000000;    if (b < 0x80) return val;
+    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x100000000000000;  if (b < 0x80) return val;
+    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x8000000000000000; if (b < 0x80) return val;
 
-  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
+    throw new Error('Expected varint not more than 10 bytes');
+}
 
-  // .end() fully uncorks
-  if (state.corked) {
-    state.corked = 1;
-    this.uncork();
-  }
+function writeBigVarint(val, pbf) {
+    pbf.realloc(10);
 
-  // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished) endWritable(this, state, cb);
-};
+    var maxPos = pbf.pos + 10;
 
-function needFinish(state) {
-  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
+    while (val >= 1) {
+        if (pbf.pos >= maxPos) throw new Error('Given varint doesn\'t fit into 10 bytes');
+        var b = val & 0xff;
+        pbf.buf[pbf.pos++] = b | (val >= 0x80 ? 0x80 : 0);
+        val /= 0x80;
+    }
 }
 
-function prefinish(stream, state) {
-  if (!state.prefinished) {
-    state.prefinished = true;
-    stream.emit('prefinish');
-  }
-}
+function reallocForRawMessage(startPos, len, pbf) {
+    var extraLen =
+        len <= 0x3fff ? 1 :
+        len <= 0x1fffff ? 2 :
+        len <= 0xfffffff ? 3 : Math.ceil(Math.log(len) / (Math.LN2 * 7));
 
-function finishMaybe(stream, state) {
-  var need = needFinish(state);
-  if (need) {
-    if (state.pendingcb === 0) {
-      prefinish(stream, state);
-      state.finished = true;
-      stream.emit('finish');
-    } else {
-      prefinish(stream, state);
-    }
-  }
-  return need;
+    // if 1 byte isn't enough for encoding message length, shift the data to the right
+    pbf.realloc(extraLen);
+    for (var i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];
 }
 
-function endWritable(stream, state, cb) {
-  state.ending = true;
-  finishMaybe(stream, state);
-  if (cb) {
-    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
-  }
-  state.ended = true;
-  stream.writable = false;
-}
+function writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }
+function writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }
+function writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }
+function writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }
+function writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }
+function writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }
+function writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }
+function writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }
+function writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }
 
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 
-  this.next = null;
-  this.entry = null;
+},{"./buffer":180}],182:[function(_dereq_,module,exports){
+'use strict';
 
-  this.finish = function (err) {
-    var entry = _this.entry;
-    _this.entry = null;
-    while (entry) {
-      var cb = entry.callback;
-      state.pendingcb--;
-      cb(err);
-      entry = entry.next;
-    }
-    if (state.corkedRequestsFree) {
-      state.corkedRequestsFree.next = _this;
-    } else {
-      state.corkedRequestsFree = _this;
-    }
-  };
+module.exports = Point;
+
+function Point(x, y) {
+    this.x = x;
+    this.y = y;
 }
-}).call(this,_dereq_('_process'))
 
-},{"./_stream_duplex":176,"_process":8,"buffer":2,"core-util-is":181,"events":6,"inherits":182,"process-nextick-args":184,"util-deprecate":186}],181:[function(_dereq_,module,exports){
-(function (Buffer){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
+Point.prototype = {
+    clone: function() { return new Point(this.x, this.y); },
+
+    add:     function(p) { return this.clone()._add(p);     },
+    sub:     function(p) { return this.clone()._sub(p);     },
+    mult:    function(k) { return this.clone()._mult(k);    },
+    div:     function(k) { return this.clone()._div(k);     },
+    rotate:  function(a) { return this.clone()._rotate(a);  },
+    matMult: function(m) { return this.clone()._matMult(m); },
+    unit:    function() { return this.clone()._unit(); },
+    perp:    function() { return this.clone()._perp(); },
+    round:   function() { return this.clone()._round(); },
 
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
+    mag: function() {
+        return Math.sqrt(this.x * this.x + this.y * this.y);
+    },
 
-function isArray(arg) {
-  if (Array.isArray) {
-    return Array.isArray(arg);
-  }
-  return objectToString(arg) === '[object Array]';
-}
-exports.isArray = isArray;
+    equals: function(p) {
+        return this.x === p.x &&
+               this.y === p.y;
+    },
 
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
-}
-exports.isBoolean = isBoolean;
+    dist: function(p) {
+        return Math.sqrt(this.distSqr(p));
+    },
 
-function isNull(arg) {
-  return arg === null;
-}
-exports.isNull = isNull;
+    distSqr: function(p) {
+        var dx = p.x - this.x,
+            dy = p.y - this.y;
+        return dx * dx + dy * dy;
+    },
 
-function isNullOrUndefined(arg) {
-  return arg == null;
-}
-exports.isNullOrUndefined = isNullOrUndefined;
+    angle: function() {
+        return Math.atan2(this.y, this.x);
+    },
 
-function isNumber(arg) {
-  return typeof arg === 'number';
-}
-exports.isNumber = isNumber;
+    angleTo: function(b) {
+        return Math.atan2(this.y - b.y, this.x - b.x);
+    },
 
-function isString(arg) {
-  return typeof arg === 'string';
-}
-exports.isString = isString;
+    angleWith: function(b) {
+        return this.angleWithSep(b.x, b.y);
+    },
 
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
-}
-exports.isSymbol = isSymbol;
+    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.
+    angleWithSep: function(x, y) {
+        return Math.atan2(
+            this.x * y - this.y * x,
+            this.x * x + this.y * y);
+    },
 
-function isUndefined(arg) {
-  return arg === void 0;
-}
-exports.isUndefined = isUndefined;
+    _matMult: function(m) {
+        var x = m[0] * this.x + m[1] * this.y,
+            y = m[2] * this.x + m[3] * this.y;
+        this.x = x;
+        this.y = y;
+        return this;
+    },
 
-function isRegExp(re) {
-  return objectToString(re) === '[object RegExp]';
-}
-exports.isRegExp = isRegExp;
+    _add: function(p) {
+        this.x += p.x;
+        this.y += p.y;
+        return this;
+    },
 
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
-}
-exports.isObject = isObject;
+    _sub: function(p) {
+        this.x -= p.x;
+        this.y -= p.y;
+        return this;
+    },
 
-function isDate(d) {
-  return objectToString(d) === '[object Date]';
-}
-exports.isDate = isDate;
+    _mult: function(k) {
+        this.x *= k;
+        this.y *= k;
+        return this;
+    },
 
-function isError(e) {
-  return (objectToString(e) === '[object Error]' || e instanceof Error);
-}
-exports.isError = isError;
+    _div: function(k) {
+        this.x /= k;
+        this.y /= k;
+        return this;
+    },
 
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-exports.isFunction = isFunction;
+    _unit: function() {
+        this._div(this.mag());
+        return this;
+    },
 
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
-}
-exports.isPrimitive = isPrimitive;
+    _perp: function() {
+        var y = this.y;
+        this.y = this.x;
+        this.x = -y;
+        return this;
+    },
 
-exports.isBuffer = Buffer.isBuffer;
+    _rotate: function(angle) {
+        var cos = Math.cos(angle),
+            sin = Math.sin(angle),
+            x = cos * this.x - sin * this.y,
+            y = sin * this.x + cos * this.y;
+        this.x = x;
+        this.y = y;
+        return this;
+    },
 
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
-}
+    _round: function() {
+        this.x = Math.round(this.x);
+        this.y = Math.round(this.y);
+        return this;
+    }
+};
 
-}).call(this,{"isBuffer":_dereq_("../../../../../../browserify/node_modules/insert-module-globals/node_modules/is-buffer/index.js")})
+// constructs Point from an array if necessary
+Point.convert = function (a) {
+    if (a instanceof Point) {
+        return a;
+    }
+    if (Array.isArray(a)) {
+        return new Point(a[0], a[1]);
+    }
+    return a;
+};
 
-},{"../../../../../../browserify/node_modules/insert-module-globals/node_modules/is-buffer/index.js":7}],182:[function(_dereq_,module,exports){
-arguments[4][9][0].apply(exports,arguments)
-},{"dup":9}],183:[function(_dereq_,module,exports){
-arguments[4][5][0].apply(exports,arguments)
-},{"dup":5}],184:[function(_dereq_,module,exports){
+},{}],183:[function(_dereq_,module,exports){
 (function (process){
 'use strict';
 
@@ -21757,7 +21710,189 @@ function nextTick(fn, arg1, arg2, arg3) {
 
 }).call(this,_dereq_('_process'))
 
-},{"_process":8}],185:[function(_dereq_,module,exports){
+},{"_process":184}],184:[function(_dereq_,module,exports){
+// shim for using process in browser
+var process = module.exports = {};
+
+// cached from whatever global is present so that test runners that stub it
+// don't break things.  But we need to wrap it in a try catch in case it is
+// wrapped in strict mode code which doesn't define any globals.  It's inside a
+// function because try/catches deoptimize in certain engines.
+
+var cachedSetTimeout;
+var cachedClearTimeout;
+
+function defaultSetTimout() {
+    throw new Error('setTimeout has not been defined');
+}
+function defaultClearTimeout () {
+    throw new Error('clearTimeout has not been defined');
+}
+(function () {
+    try {
+        if (typeof setTimeout === 'function') {
+            cachedSetTimeout = setTimeout;
+        } else {
+            cachedSetTimeout = defaultSetTimout;
+        }
+    } catch (e) {
+        cachedSetTimeout = defaultSetTimout;
+    }
+    try {
+        if (typeof clearTimeout === 'function') {
+            cachedClearTimeout = clearTimeout;
+        } else {
+            cachedClearTimeout = defaultClearTimeout;
+        }
+    } catch (e) {
+        cachedClearTimeout = defaultClearTimeout;
+    }
+} ())
+function runTimeout(fun) {
+    if (cachedSetTimeout === setTimeout) {
+        //normal enviroments in sane situations
+        return setTimeout(fun, 0);
+    }
+    // if setTimeout wasn't available but was latter defined
+    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
+        cachedSetTimeout = setTimeout;
+        return setTimeout(fun, 0);
+    }
+    try {
+        // when when somebody has screwed with setTimeout but no I.E. maddness
+        return cachedSetTimeout(fun, 0);
+    } catch(e){
+        try {
+            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
+            return cachedSetTimeout.call(null, fun, 0);
+        } catch(e){
+            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
+            return cachedSetTimeout.call(this, fun, 0);
+        }
+    }
+
+
+}
+function runClearTimeout(marker) {
+    if (cachedClearTimeout === clearTimeout) {
+        //normal enviroments in sane situations
+        return clearTimeout(marker);
+    }
+    // if clearTimeout wasn't available but was latter defined
+    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
+        cachedClearTimeout = clearTimeout;
+        return clearTimeout(marker);
+    }
+    try {
+        // when when somebody has screwed with setTimeout but no I.E. maddness
+        return cachedClearTimeout(marker);
+    } catch (e){
+        try {
+            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
+            return cachedClearTimeout.call(null, marker);
+        } catch (e){
+            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
+            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
+            return cachedClearTimeout.call(this, marker);
+        }
+    }
+
+
+
+}
+var queue = [];
+var draining = false;
+var currentQueue;
+var queueIndex = -1;
+
+function cleanUpNextTick() {
+    if (!draining || !currentQueue) {
+        return;
+    }
+    draining = false;
+    if (currentQueue.length) {
+        queue = currentQueue.concat(queue);
+    } else {
+        queueIndex = -1;
+    }
+    if (queue.length) {
+        drainQueue();
+    }
+}
+
+function drainQueue() {
+    if (draining) {
+        return;
+    }
+    var timeout = runTimeout(cleanUpNextTick);
+    draining = true;
+
+    var len = queue.length;
+    while(len) {
+        currentQueue = queue;
+        queue = [];
+        while (++queueIndex < len) {
+            if (currentQueue) {
+                currentQueue[queueIndex].run();
+            }
+        }
+        queueIndex = -1;
+        len = queue.length;
+    }
+    currentQueue = null;
+    draining = false;
+    runClearTimeout(timeout);
+}
+
+process.nextTick = function (fun) {
+    var args = new Array(arguments.length - 1);
+    if (arguments.length > 1) {
+        for (var i = 1; i < arguments.length; i++) {
+            args[i - 1] = arguments[i];
+        }
+    }
+    queue.push(new Item(fun, args));
+    if (queue.length === 1 && !draining) {
+        runTimeout(drainQueue);
+    }
+};
+
+// v8 likes predictible objects
+function Item(fun, array) {
+    this.fun = fun;
+    this.array = array;
+}
+Item.prototype.run = function () {
+    this.fun.apply(null, this.array);
+};
+process.title = 'browser';
+process.browser = true;
+process.env = {};
+process.argv = [];
+process.version = ''; // empty string to avoid regexp issues
+process.versions = {};
+
+function noop() {}
+
+process.on = noop;
+process.addListener = noop;
+process.once = noop;
+process.off = noop;
+process.removeListener = noop;
+process.removeAllListeners = noop;
+process.emit = noop;
+
+process.binding = function (name) {
+    throw new Error('process.binding is not supported');
+};
+
+process.cwd = function () { return '/' };
+process.chdir = function (dir) {
+    throw new Error('process.chdir is not supported');
+};
+process.umask = function() { return 0; };
+
+},{}],185:[function(_dereq_,module,exports){
 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
@@ -21923,64 +22058,255 @@ StringDecoder.prototype.detectIncompleteChar = function(buffer) {
   // determine how many bytes we have to check at the end of this buffer
   var i = (buffer.length >= 3) ? 3 : buffer.length;
 
-  // Figure out if one of the last i bytes of our buffer announces an
-  // incomplete char.
-  for (; i > 0; i--) {
-    var c = buffer[buffer.length - i];
+  // Figure out if one of the last i bytes of our buffer announces an
+  // incomplete char.
+  for (; i > 0; i--) {
+    var c = buffer[buffer.length - i];
+
+    // See http://en.wikipedia.org/wiki/UTF-8#Description
+
+    // 110XXXXX
+    if (i == 1 && c >> 5 == 0x06) {
+      this.charLength = 2;
+      break;
+    }
+
+    // 1110XXXX
+    if (i <= 2 && c >> 4 == 0x0E) {
+      this.charLength = 3;
+      break;
+    }
+
+    // 11110XXX
+    if (i <= 3 && c >> 3 == 0x1E) {
+      this.charLength = 4;
+      break;
+    }
+  }
+  this.charReceived = i;
+};
+
+StringDecoder.prototype.end = function(buffer) {
+  var res = '';
+  if (buffer && buffer.length)
+    res = this.write(buffer);
+
+  if (this.charReceived) {
+    var cr = this.charReceived;
+    var buf = this.charBuffer;
+    var enc = this.encoding;
+    res += buf.slice(0, cr).toString(enc);
+  }
+
+  return res;
+};
+
+function passThroughWrite(buffer) {
+  return buffer.toString(this.encoding);
+}
+
+function utf16DetectIncompleteChar(buffer) {
+  this.charReceived = buffer.length % 2;
+  this.charLength = this.charReceived ? 2 : 0;
+}
+
+function base64DetectIncompleteChar(buffer) {
+  this.charReceived = buffer.length % 3;
+  this.charLength = this.charReceived ? 3 : 0;
+}
+
+},{"buffer":5}],186:[function(_dereq_,module,exports){
+/*!
+ * strip-comments <https://github.com/jonschlinkert/strip-comments>
+ *
+ * Copyright (c) 2014 Jon Schlinkert, contributors.
+ * Licensed under the MIT license.
+ */
+
+'use stric';
+
+var reBlock = '\\/\\*';
+var reBlockIgnore = '\\/\\*(?!\\*?\\!)';
+var reBlockEnd = '(.|[\\r\\n]|\\n)*?\\*\\/\\n?\\n?';
+var reLine = /(^|[^\S\n])(?:\/\/)([\s\S]+?)$/gm;
+var reLineIgnore = /(^|[^\S\n])(?:\/\/[^!])([\s\S]+?)$/gm;
+
+
+/**
+ * Strip all comments
+ *
+ * {%= docs("strip") %}
+ *
+ * @param   {String} `str`  file contents or string to strip.
+ * @param   {Object} `opts`  options are passed to `.block`, and `.line`
+ * @return  {String} String without comments.
+ * @api public
+ */
+
+var strip = module.exports = function(str, opts) {
+  return str ? strip.block(strip.line(str, opts), opts) : '';
+};
+
+
+/**
+ * Strip only block comments, optionally leaving protected comments
+ * (e.g. `/*!`) intact.
+ *
+ * {%= docs("block") %}
+ *
+ * @param   {String} `str`  file content or string to strip to
+ * @param   {Object} `opts`  if `safe:true`, strip only comments that do not start with `/*!` or `/**!`
+ * @return  {String} String without block comments.
+ * @api public
+ */
+
+strip.block = function(str, opts) {
+  opts = opts || {};
+  var re = new RegExp(reBlock + reBlockEnd, 'gm');
+  if(opts.safe) {
+    re = new RegExp(reBlockIgnore + reBlockEnd, 'gm');
+  }
+  return str ? str.replace(re, '') : '';
+};
+
+
+/**
+ * Strip only line comments
+ *
+ * {%= docs("line") %}
+ *
+ * @param   {String} `str`  file content or string to strip to
+ * @param   {Object} `opts`  if `safe:true`, strip all that not starts with `//!`
+ * @return  {String} String without line comments.
+ * @api public
+ */
+
+strip.line = function(str, opts) {
+  opts = opts || {};
+  var re = reLine;
+  if(opts.safe) {
+    re = reLineIgnore;
+  }
+  return str ? str.replace(re, '') : '';
+};
+
+},{}],187:[function(_dereq_,module,exports){
+// https://github.com/topojson/topojson-client Version 2.1.0. Copyright 2016 Mike Bostock.
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (factory((global.topojson = global.topojson || {})));
+}(this, (function (exports) { 'use strict';
+
+var reverse = function(array, n) {
+  var t, j = array.length, i = j - n;
+  while (i < --j) t = array[i], array[i++] = array[j], array[j] = t;
+};
+
+var identity = function(x) {
+  return x;
+};
+
+var transform = function(topology) {
+  if ((transform = topology.transform) == null) return identity;
+  var transform,
+      x0,
+      y0,
+      kx = transform.scale[0],
+      ky = transform.scale[1],
+      dx = transform.translate[0],
+      dy = transform.translate[1];
+  return function(point, i) {
+    if (!i) x0 = y0 = 0;
+    point[0] = (x0 += point[0]) * kx + dx;
+    point[1] = (y0 += point[1]) * ky + dy;
+    return point;
+  };
+};
+
+var feature = function(topology, o) {
+  return o.type === "GeometryCollection"
+      ? {type: "FeatureCollection", features: o.geometries.map(function(o) { return feature$1(topology, o); })}
+      : feature$1(topology, o);
+};
+
+function feature$1(topology, o) {
+  var id = o.id,
+      bbox = o.bbox,
+      properties = o.properties == null ? {} : o.properties,
+      geometry = object(topology, o);
+  return id == null && bbox == null ? {type: "Feature", properties: properties, geometry: geometry}
+      : bbox == null ? {type: "Feature", id: id, properties: properties, geometry: geometry}
+      : {type: "Feature", id: id, bbox: bbox, properties: properties, geometry: geometry};
+}
 
-    // See http://en.wikipedia.org/wiki/UTF-8#Description
+function object(topology, o) {
+  var transformPoint = transform(topology),
+      arcs = topology.arcs;
 
-    // 110XXXXX
-    if (i == 1 && c >> 5 == 0x06) {
-      this.charLength = 2;
-      break;
+  function arc(i, points) {
+    if (points.length) points.pop();
+    for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length; k < n; ++k) {
+      points.push(transformPoint(a[k].slice(), k));
     }
+    if (i < 0) reverse(points, n);
+  }
 
-    // 1110XXXX
-    if (i <= 2 && c >> 4 == 0x0E) {
-      this.charLength = 3;
-      break;
-    }
+  function point(p) {
+    return transformPoint(p.slice());
+  }
 
-    // 11110XXX
-    if (i <= 3 && c >> 3 == 0x1E) {
-      this.charLength = 4;
-      break;
-    }
+  function line(arcs) {
+    var points = [];
+    for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points);
+    if (points.length < 2) points.push(points[0].slice());
+    return points;
   }
-  this.charReceived = i;
-};
 
-StringDecoder.prototype.end = function(buffer) {
-  var res = '';
-  if (buffer && buffer.length)
-    res = this.write(buffer);
+  function ring(arcs) {
+    var points = line(arcs);
+    while (points.length < 4) points.push(points[0].slice());
+    return points;
+  }
 
-  if (this.charReceived) {
-    var cr = this.charReceived;
-    var buf = this.charBuffer;
-    var enc = this.encoding;
-    res += buf.slice(0, cr).toString(enc);
+  function polygon(arcs) {
+    return arcs.map(ring);
   }
 
-  return res;
-};
+  function geometry(o) {
+    var type = o.type, coordinates;
+    switch (type) {
+      case "GeometryCollection": return {type: type, geometries: o.geometries.map(geometry)};
+      case "Point": coordinates = point(o.coordinates); break;
+      case "MultiPoint": coordinates = o.coordinates.map(point); break;
+      case "LineString": coordinates = line(o.arcs); break;
+      case "MultiLineString": coordinates = o.arcs.map(line); break;
+      case "Polygon": coordinates = polygon(o.arcs); break;
+      case "MultiPolygon": coordinates = o.arcs.map(polygon); break;
+      default: return null;
+    }
+    return {type: type, coordinates: coordinates};
+  }
 
-function passThroughWrite(buffer) {
-  return buffer.toString(this.encoding);
+  return geometry(o);
 }
 
-function utf16DetectIncompleteChar(buffer) {
-  this.charReceived = buffer.length % 2;
-  this.charLength = this.charReceived ? 2 : 0;
-}
+// export {default as bbox} from "./src/bbox";
 
-function base64DetectIncompleteChar(buffer) {
-  this.charReceived = buffer.length % 3;
-  this.charLength = this.charReceived ? 3 : 0;
-}
+// export {default as mesh, meshArcs} from "./src/mesh";
+// export {default as merge, mergeArcs} from "./src/merge";
+// export {default as neighbors} from "./src/neighbors";
+// export {default as quantize} from "./src/quantize";
+// export {default as transform} from "./src/transform";
+// export {default as untransform} from "./src/untransform";
+
+exports.feature = feature;
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
 
-},{"buffer":2}],186:[function(_dereq_,module,exports){
+},{}],188:[function(_dereq_,module,exports){
 (function (global){
 
 /**
@@ -22052,807 +22378,612 @@ function config (name) {
 
 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 
-},{}],187:[function(_dereq_,module,exports){
-var Stream = (function (){
-  try {
-    return _dereq_('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
-  } catch(_){}
-}());
-exports = module.exports = _dereq_('./lib/_stream_readable.js');
-exports.Stream = Stream || exports;
-exports.Readable = exports;
-exports.Writable = _dereq_('./lib/_stream_writable.js');
-exports.Duplex = _dereq_('./lib/_stream_duplex.js');
-exports.Transform = _dereq_('./lib/_stream_transform.js');
-exports.PassThrough = _dereq_('./lib/_stream_passthrough.js');
-
-},{"./lib/_stream_duplex.js":176,"./lib/_stream_passthrough.js":177,"./lib/_stream_readable.js":178,"./lib/_stream_transform.js":179,"./lib/_stream_writable.js":180}],188:[function(_dereq_,module,exports){
-'use strict';
-
-// lightweight Buffer shim for pbf browser build
-// based on code from github.com/feross/buffer (MIT-licensed)
-
-module.exports = Buffer;
-
-var ieee754 = _dereq_('ieee754');
-
-var BufferMethods;
-
-function Buffer(length) {
-    var arr;
-    if (length && length.length) {
-        arr = length;
-        length = arr.length;
-    }
-    var buf = new Uint8Array(length || 0);
-    if (arr) buf.set(arr);
-
-    buf.readUInt32LE = BufferMethods.readUInt32LE;
-    buf.writeUInt32LE = BufferMethods.writeUInt32LE;
-    buf.readInt32LE = BufferMethods.readInt32LE;
-    buf.writeInt32LE = BufferMethods.writeInt32LE;
-    buf.readFloatLE = BufferMethods.readFloatLE;
-    buf.writeFloatLE = BufferMethods.writeFloatLE;
-    buf.readDoubleLE = BufferMethods.readDoubleLE;
-    buf.writeDoubleLE = BufferMethods.writeDoubleLE;
-    buf.toString = BufferMethods.toString;
-    buf.write = BufferMethods.write;
-    buf.slice = BufferMethods.slice;
-    buf.copy = BufferMethods.copy;
-
-    buf._isBuffer = true;
-    return buf;
+},{}],189:[function(_dereq_,module,exports){
+arguments[4][94][0].apply(exports,arguments)
+},{"dup":94}],190:[function(_dereq_,module,exports){
+module.exports = function isBuffer(arg) {
+  return arg && typeof arg === 'object'
+    && typeof arg.copy === 'function'
+    && typeof arg.fill === 'function'
+    && typeof arg.readUInt8 === 'function';
 }
+},{}],191:[function(_dereq_,module,exports){
+(function (process,global){
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-var lastStr, lastStrEncoded;
-
-BufferMethods = {
-    readUInt32LE: function(pos) {
-        return ((this[pos]) |
-            (this[pos + 1] << 8) |
-            (this[pos + 2] << 16)) +
-            (this[pos + 3] * 0x1000000);
-    },
-
-    writeUInt32LE: function(val, pos) {
-        this[pos] = val;
-        this[pos + 1] = (val >>> 8);
-        this[pos + 2] = (val >>> 16);
-        this[pos + 3] = (val >>> 24);
-    },
-
-    readInt32LE: function(pos) {
-        return ((this[pos]) |
-            (this[pos + 1] << 8) |
-            (this[pos + 2] << 16)) +
-            (this[pos + 3] << 24);
-    },
-
-    readFloatLE:  function(pos) { return ieee754.read(this, pos, true, 23, 4); },
-    readDoubleLE: function(pos) { return ieee754.read(this, pos, true, 52, 8); },
-
-    writeFloatLE:  function(val, pos) { return ieee754.write(this, val, pos, true, 23, 4); },
-    writeDoubleLE: function(val, pos) { return ieee754.write(this, val, pos, true, 52, 8); },
-
-    toString: function(encoding, start, end) {
-        var str = '',
-            tmp = '';
-
-        start = start || 0;
-        end = Math.min(this.length, end || this.length);
-
-        for (var i = start; i < end; i++) {
-            var ch = this[i];
-            if (ch <= 0x7F) {
-                str += decodeURIComponent(tmp) + String.fromCharCode(ch);
-                tmp = '';
-            } else {
-                tmp += '%' + ch.toString(16);
-            }
-        }
-
-        str += decodeURIComponent(tmp);
-
-        return str;
-    },
-
-    write: function(str, pos) {
-        var bytes = str === lastStr ? lastStrEncoded : encodeString(str);
-        for (var i = 0; i < bytes.length; i++) {
-            this[pos + i] = bytes[i];
-        }
-    },
-
-    slice: function(start, end) {
-        return this.subarray(start, end);
-    },
+var formatRegExp = /%[sdj%]/g;
+exports.format = function(f) {
+  if (!isString(f)) {
+    var objects = [];
+    for (var i = 0; i < arguments.length; i++) {
+      objects.push(inspect(arguments[i]));
+    }
+    return objects.join(' ');
+  }
 
-    copy: function(buf, pos) {
-        pos = pos || 0;
-        for (var i = 0; i < this.length; i++) {
-            buf[pos + i] = this[i];
+  var i = 1;
+  var args = arguments;
+  var len = args.length;
+  var str = String(f).replace(formatRegExp, function(x) {
+    if (x === '%%') return '%';
+    if (i >= len) return x;
+    switch (x) {
+      case '%s': return String(args[i++]);
+      case '%d': return Number(args[i++]);
+      case '%j':
+        try {
+          return JSON.stringify(args[i++]);
+        } catch (_) {
+          return '[Circular]';
         }
+      default:
+        return x;
     }
+  });
+  for (var x = args[i]; i < len; x = args[++i]) {
+    if (isNull(x) || !isObject(x)) {
+      str += ' ' + x;
+    } else {
+      str += ' ' + inspect(x);
+    }
+  }
+  return str;
 };
 
-BufferMethods.writeInt32LE = BufferMethods.writeUInt32LE;
-
-Buffer.byteLength = function(str) {
-    lastStr = str;
-    lastStrEncoded = encodeString(str);
-    return lastStrEncoded.length;
-};
-
-Buffer.isBuffer = function(buf) {
-    return !!(buf && buf._isBuffer);
-};
-
-function encodeString(str) {
-    var length = str.length,
-        bytes = [];
-
-    for (var i = 0, c, lead; i < length; i++) {
-        c = str.charCodeAt(i); // code point
-
-        if (c > 0xD7FF && c < 0xE000) {
-
-            if (lead) {
-                if (c < 0xDC00) {
-                    bytes.push(0xEF, 0xBF, 0xBD);
-                    lead = c;
-                    continue;
-
-                } else {
-                    c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
-                    lead = null;
-                }
-
-            } else {
-                if (c > 0xDBFF || (i + 1 === length)) bytes.push(0xEF, 0xBF, 0xBD);
-                else lead = c;
 
-                continue;
-            }
+// Mark that a method should not be used.
+// Returns a modified function which warns once by default.
+// If --no-deprecation is set, then it is a no-op.
+exports.deprecate = function(fn, msg) {
+  // Allow for deprecating things in the process of starting up.
+  if (isUndefined(global.process)) {
+    return function() {
+      return exports.deprecate(fn, msg).apply(this, arguments);
+    };
+  }
 
-        } else if (lead) {
-            bytes.push(0xEF, 0xBF, 0xBD);
-            lead = null;
-        }
+  if (process.noDeprecation === true) {
+    return fn;
+  }
 
-        if (c < 0x80) bytes.push(c);
-        else if (c < 0x800) bytes.push(c >> 0x6 | 0xC0, c & 0x3F | 0x80);
-        else if (c < 0x10000) bytes.push(c >> 0xC | 0xE0, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
-        else bytes.push(c >> 0x12 | 0xF0, c >> 0xC & 0x3F | 0x80, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
+  var warned = false;
+  function deprecated() {
+    if (!warned) {
+      if (process.throwDeprecation) {
+        throw new Error(msg);
+      } else if (process.traceDeprecation) {
+        console.trace(msg);
+      } else {
+        console.error(msg);
+      }
+      warned = true;
     }
-    return bytes;
-}
-
-},{"ieee754":190}],189:[function(_dereq_,module,exports){
-(function (global){
-'use strict';
-
-module.exports = Pbf;
-
-var Buffer = global.Buffer || _dereq_('./buffer');
-
-function Pbf(buf) {
-    this.buf = !Buffer.isBuffer(buf) ? new Buffer(buf || 0) : buf;
-    this.pos = 0;
-    this.length = this.buf.length;
-}
-
-Pbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
-Pbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64
-Pbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
-Pbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32
-
-var SHIFT_LEFT_32 = (1 << 16) * (1 << 16),
-    SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32,
-    POW_2_63 = Math.pow(2, 63);
-
-Pbf.prototype = {
-
-    destroy: function() {
-        this.buf = null;
-    },
-
-    // === READING =================================================================
-
-    readFields: function(readField, result, end) {
-        end = end || this.length;
-
-        while (this.pos < end) {
-            var val = this.readVarint(),
-                tag = val >> 3,
-                startPos = this.pos;
-
-            readField(tag, result, this);
-
-            if (this.pos === startPos) this.skip(val);
-        }
-        return result;
-    },
-
-    readMessage: function(readField, result) {
-        return this.readFields(readField, result, this.readVarint() + this.pos);
-    },
-
-    readFixed32: function() {
-        var val = this.buf.readUInt32LE(this.pos);
-        this.pos += 4;
-        return val;
-    },
-
-    readSFixed32: function() {
-        var val = this.buf.readInt32LE(this.pos);
-        this.pos += 4;
-        return val;
-    },
-
-    // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)
-
-    readFixed64: function() {
-        var val = this.buf.readUInt32LE(this.pos) + this.buf.readUInt32LE(this.pos + 4) * SHIFT_LEFT_32;
-        this.pos += 8;
-        return val;
-    },
-
-    readSFixed64: function() {
-        var val = this.buf.readUInt32LE(this.pos) + this.buf.readInt32LE(this.pos + 4) * SHIFT_LEFT_32;
-        this.pos += 8;
-        return val;
-    },
-
-    readFloat: function() {
-        var val = this.buf.readFloatLE(this.pos);
-        this.pos += 4;
-        return val;
-    },
-
-    readDouble: function() {
-        var val = this.buf.readDoubleLE(this.pos);
-        this.pos += 8;
-        return val;
-    },
-
-    readVarint: function() {
-        var buf = this.buf,
-            val, b;
-
-        b = buf[this.pos++]; val  =  b & 0x7f;        if (b < 0x80) return val;
-        b = buf[this.pos++]; val |= (b & 0x7f) << 7;  if (b < 0x80) return val;
-        b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;
-        b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;
-
-        return readVarintRemainder(val, this);
-    },
-
-    readVarint64: function() {
-        var startPos = this.pos,
-            val = this.readVarint();
-
-        if (val < POW_2_63) return val;
+    return fn.apply(this, arguments);
+  }
 
-        var pos = this.pos - 2;
-        while (this.buf[pos] === 0xff) pos--;
-        if (pos < startPos) pos = startPos;
+  return deprecated;
+};
 
-        val = 0;
-        for (var i = 0; i < pos - startPos + 1; i++) {
-            var b = ~this.buf[startPos + i] & 0x7f;
-            val += i < 4 ? b << i * 7 : b * Math.pow(2, i * 7);
-        }
 
-        return -val - 1;
-    },
+var debugs = {};
+var debugEnviron;
+exports.debuglog = function(set) {
+  if (isUndefined(debugEnviron))
+    debugEnviron = process.env.NODE_DEBUG || '';
+  set = set.toUpperCase();
+  if (!debugs[set]) {
+    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
+      var pid = process.pid;
+      debugs[set] = function() {
+        var msg = exports.format.apply(exports, arguments);
+        console.error('%s %d: %s', set, pid, msg);
+      };
+    } else {
+      debugs[set] = function() {};
+    }
+  }
+  return debugs[set];
+};
 
-    readSVarint: function() {
-        var num = this.readVarint();
-        return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
-    },
 
-    readBoolean: function() {
-        return Boolean(this.readVarint());
-    },
+/**
+ * Echos the value of a value. Trys to print the value out
+ * in the best way possible given the different types.
+ *
+ * @param {Object} obj The object to print out.
+ * @param {Object} opts Optional options object that alters the output.
+ */
+/* legacy: obj, showHidden, depth, colors*/
+function inspect(obj, opts) {
+  // default options
+  var ctx = {
+    seen: [],
+    stylize: stylizeNoColor
+  };
+  // legacy...
+  if (arguments.length >= 3) ctx.depth = arguments[2];
+  if (arguments.length >= 4) ctx.colors = arguments[3];
+  if (isBoolean(opts)) {
+    // legacy...
+    ctx.showHidden = opts;
+  } else if (opts) {
+    // got an "options" object
+    exports._extend(ctx, opts);
+  }
+  // set default options
+  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
+  if (isUndefined(ctx.depth)) ctx.depth = 2;
+  if (isUndefined(ctx.colors)) ctx.colors = false;
+  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
+  if (ctx.colors) ctx.stylize = stylizeWithColor;
+  return formatValue(ctx, obj, ctx.depth);
+}
+exports.inspect = inspect;
 
-    readString: function() {
-        var end = this.readVarint() + this.pos,
-            str = this.buf.toString('utf8', this.pos, end);
-        this.pos = end;
-        return str;
-    },
 
-    readBytes: function() {
-        var end = this.readVarint() + this.pos,
-            buffer = this.buf.slice(this.pos, end);
-        this.pos = end;
-        return buffer;
-    },
+// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
+inspect.colors = {
+  'bold' : [1, 22],
+  'italic' : [3, 23],
+  'underline' : [4, 24],
+  'inverse' : [7, 27],
+  'white' : [37, 39],
+  'grey' : [90, 39],
+  'black' : [30, 39],
+  'blue' : [34, 39],
+  'cyan' : [36, 39],
+  'green' : [32, 39],
+  'magenta' : [35, 39],
+  'red' : [31, 39],
+  'yellow' : [33, 39]
+};
 
-    // verbose for performance reasons; doesn't affect gzipped size
+// Don't use 'blue' not visible on cmd.exe
+inspect.styles = {
+  'special': 'cyan',
+  'number': 'yellow',
+  'boolean': 'yellow',
+  'undefined': 'grey',
+  'null': 'bold',
+  'string': 'green',
+  'date': 'magenta',
+  // "name": intentionally not styling
+  'regexp': 'red'
+};
 
-    readPackedVarint: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readVarint());
-        return arr;
-    },
-    readPackedSVarint: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readSVarint());
-        return arr;
-    },
-    readPackedBoolean: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readBoolean());
-        return arr;
-    },
-    readPackedFloat: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readFloat());
-        return arr;
-    },
-    readPackedDouble: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readDouble());
-        return arr;
-    },
-    readPackedFixed32: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readFixed32());
-        return arr;
-    },
-    readPackedSFixed32: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readSFixed32());
-        return arr;
-    },
-    readPackedFixed64: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readFixed64());
-        return arr;
-    },
-    readPackedSFixed64: function() {
-        var end = this.readVarint() + this.pos, arr = [];
-        while (this.pos < end) arr.push(this.readSFixed64());
-        return arr;
-    },
 
-    skip: function(val) {
-        var type = val & 0x7;
-        if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}
-        else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;
-        else if (type === Pbf.Fixed32) this.pos += 4;
-        else if (type === Pbf.Fixed64) this.pos += 8;
-        else throw new Error('Unimplemented type: ' + type);
-    },
+function stylizeWithColor(str, styleType) {
+  var style = inspect.styles[styleType];
 
-    // === WRITING =================================================================
+  if (style) {
+    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
+           '\u001b[' + inspect.colors[style][1] + 'm';
+  } else {
+    return str;
+  }
+}
 
-    writeTag: function(tag, type) {
-        this.writeVarint((tag << 3) | type);
-    },
 
-    realloc: function(min) {
-        var length = this.length || 16;
+function stylizeNoColor(str, styleType) {
+  return str;
+}
 
-        while (length < this.pos + min) length *= 2;
 
-        if (length !== this.length) {
-            var buf = new Buffer(length);
-            this.buf.copy(buf);
-            this.buf = buf;
-            this.length = length;
-        }
-    },
+function arrayToHash(array) {
+  var hash = {};
 
-    finish: function() {
-        this.length = this.pos;
-        this.pos = 0;
-        return this.buf.slice(0, this.length);
-    },
+  array.forEach(function(val, idx) {
+    hash[val] = true;
+  });
 
-    writeFixed32: function(val) {
-        this.realloc(4);
-        this.buf.writeUInt32LE(val, this.pos);
-        this.pos += 4;
-    },
+  return hash;
+}
 
-    writeSFixed32: function(val) {
-        this.realloc(4);
-        this.buf.writeInt32LE(val, this.pos);
-        this.pos += 4;
-    },
 
-    writeFixed64: function(val) {
-        this.realloc(8);
-        this.buf.writeInt32LE(val & -1, this.pos);
-        this.buf.writeUInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
-        this.pos += 8;
-    },
+function formatValue(ctx, value, recurseTimes) {
+  // Provide a hook for user-specified inspect functions.
+  // Check that value is an object with an inspect function on it
+  if (ctx.customInspect &&
+      value &&
+      isFunction(value.inspect) &&
+      // Filter out the util module, it's inspect function is special
+      value.inspect !== exports.inspect &&
+      // Also filter out any prototype objects using the circular check.
+      !(value.constructor && value.constructor.prototype === value)) {
+    var ret = value.inspect(recurseTimes, ctx);
+    if (!isString(ret)) {
+      ret = formatValue(ctx, ret, recurseTimes);
+    }
+    return ret;
+  }
 
-    writeSFixed64: function(val) {
-        this.realloc(8);
-        this.buf.writeInt32LE(val & -1, this.pos);
-        this.buf.writeInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
-        this.pos += 8;
-    },
+  // Primitive types cannot have properties
+  var primitive = formatPrimitive(ctx, value);
+  if (primitive) {
+    return primitive;
+  }
 
-    writeVarint: function(val) {
-        val = +val;
+  // Look up the keys of the object.
+  var keys = Object.keys(value);
+  var visibleKeys = arrayToHash(keys);
 
-        if (val > 0xfffffff) {
-            writeBigVarint(val, this);
-            return;
-        }
+  if (ctx.showHidden) {
+    keys = Object.getOwnPropertyNames(value);
+  }
 
-        this.realloc(4);
+  // IE doesn't make error fields non-enumerable
+  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
+  if (isError(value)
+      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
+    return formatError(value);
+  }
 
-        this.buf[this.pos++] =           val & 0x7f  | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
-        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
-        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
-        this.buf[this.pos++] =   (val >>> 7) & 0x7f;
-    },
+  // Some type of object without properties can be shortcutted.
+  if (keys.length === 0) {
+    if (isFunction(value)) {
+      var name = value.name ? ': ' + value.name : '';
+      return ctx.stylize('[Function' + name + ']', 'special');
+    }
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    }
+    if (isDate(value)) {
+      return ctx.stylize(Date.prototype.toString.call(value), 'date');
+    }
+    if (isError(value)) {
+      return formatError(value);
+    }
+  }
 
-    writeSVarint: function(val) {
-        this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
-    },
+  var base = '', array = false, braces = ['{', '}'];
 
-    writeBoolean: function(val) {
-        this.writeVarint(Boolean(val));
-    },
+  // Make Array say that they are Array
+  if (isArray(value)) {
+    array = true;
+    braces = ['[', ']'];
+  }
 
-    writeString: function(str) {
-        str = String(str);
-        var bytes = Buffer.byteLength(str);
-        this.writeVarint(bytes);
-        this.realloc(bytes);
-        this.buf.write(str, this.pos);
-        this.pos += bytes;
-    },
+  // Make functions say that they are functions
+  if (isFunction(value)) {
+    var n = value.name ? ': ' + value.name : '';
+    base = ' [Function' + n + ']';
+  }
 
-    writeFloat: function(val) {
-        this.realloc(4);
-        this.buf.writeFloatLE(val, this.pos);
-        this.pos += 4;
-    },
+  // Make RegExps say that they are RegExps
+  if (isRegExp(value)) {
+    base = ' ' + RegExp.prototype.toString.call(value);
+  }
 
-    writeDouble: function(val) {
-        this.realloc(8);
-        this.buf.writeDoubleLE(val, this.pos);
-        this.pos += 8;
-    },
+  // Make dates with properties first say the date
+  if (isDate(value)) {
+    base = ' ' + Date.prototype.toUTCString.call(value);
+  }
 
-    writeBytes: function(buffer) {
-        var len = buffer.length;
-        this.writeVarint(len);
-        this.realloc(len);
-        for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];
-    },
+  // Make error with message first say the error
+  if (isError(value)) {
+    base = ' ' + formatError(value);
+  }
 
-    writeRawMessage: function(fn, obj) {
-        this.pos++; // reserve 1 byte for short message length
+  if (keys.length === 0 && (!array || value.length == 0)) {
+    return braces[0] + base + braces[1];
+  }
 
-        // write the message directly to the buffer and see how much was written
-        var startPos = this.pos;
-        fn(obj, this);
-        var len = this.pos - startPos;
+  if (recurseTimes < 0) {
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    } else {
+      return ctx.stylize('[Object]', 'special');
+    }
+  }
 
-        if (len >= 0x80) reallocForRawMessage(startPos, len, this);
+  ctx.seen.push(value);
 
-        // finally, write the message length in the reserved place and restore the position
-        this.pos = startPos - 1;
-        this.writeVarint(len);
-        this.pos += len;
-    },
+  var output;
+  if (array) {
+    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+  } else {
+    output = keys.map(function(key) {
+      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+    });
+  }
 
-    writeMessage: function(tag, fn, obj) {
-        this.writeTag(tag, Pbf.Bytes);
-        this.writeRawMessage(fn, obj);
-    },
+  ctx.seen.pop();
 
-    writePackedVarint:   function(tag, arr) { this.writeMessage(tag, writePackedVarint, arr);   },
-    writePackedSVarint:  function(tag, arr) { this.writeMessage(tag, writePackedSVarint, arr);  },
-    writePackedBoolean:  function(tag, arr) { this.writeMessage(tag, writePackedBoolean, arr);  },
-    writePackedFloat:    function(tag, arr) { this.writeMessage(tag, writePackedFloat, arr);    },
-    writePackedDouble:   function(tag, arr) { this.writeMessage(tag, writePackedDouble, arr);   },
-    writePackedFixed32:  function(tag, arr) { this.writeMessage(tag, writePackedFixed32, arr);  },
-    writePackedSFixed32: function(tag, arr) { this.writeMessage(tag, writePackedSFixed32, arr); },
-    writePackedFixed64:  function(tag, arr) { this.writeMessage(tag, writePackedFixed64, arr);  },
-    writePackedSFixed64: function(tag, arr) { this.writeMessage(tag, writePackedSFixed64, arr); },
+  return reduceToSingleString(output, base, braces);
+}
 
-    writeBytesField: function(tag, buffer) {
-        this.writeTag(tag, Pbf.Bytes);
-        this.writeBytes(buffer);
-    },
-    writeFixed32Field: function(tag, val) {
-        this.writeTag(tag, Pbf.Fixed32);
-        this.writeFixed32(val);
-    },
-    writeSFixed32Field: function(tag, val) {
-        this.writeTag(tag, Pbf.Fixed32);
-        this.writeSFixed32(val);
-    },
-    writeFixed64Field: function(tag, val) {
-        this.writeTag(tag, Pbf.Fixed64);
-        this.writeFixed64(val);
-    },
-    writeSFixed64Field: function(tag, val) {
-        this.writeTag(tag, Pbf.Fixed64);
-        this.writeSFixed64(val);
-    },
-    writeVarintField: function(tag, val) {
-        this.writeTag(tag, Pbf.Varint);
-        this.writeVarint(val);
-    },
-    writeSVarintField: function(tag, val) {
-        this.writeTag(tag, Pbf.Varint);
-        this.writeSVarint(val);
-    },
-    writeStringField: function(tag, str) {
-        this.writeTag(tag, Pbf.Bytes);
-        this.writeString(str);
-    },
-    writeFloatField: function(tag, val) {
-        this.writeTag(tag, Pbf.Fixed32);
-        this.writeFloat(val);
-    },
-    writeDoubleField: function(tag, val) {
-        this.writeTag(tag, Pbf.Fixed64);
-        this.writeDouble(val);
-    },
-    writeBooleanField: function(tag, val) {
-        this.writeVarintField(tag, Boolean(val));
-    }
-};
 
-function readVarintRemainder(val, pbf) {
-    var buf = pbf.buf, b;
+function formatPrimitive(ctx, value) {
+  if (isUndefined(value))
+    return ctx.stylize('undefined', 'undefined');
+  if (isString(value)) {
+    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+                                             .replace(/'/g, "\\'")
+                                             .replace(/\\"/g, '"') + '\'';
+    return ctx.stylize(simple, 'string');
+  }
+  if (isNumber(value))
+    return ctx.stylize('' + value, 'number');
+  if (isBoolean(value))
+    return ctx.stylize('' + value, 'boolean');
+  // For some reason typeof null is "object", so special case here.
+  if (isNull(value))
+    return ctx.stylize('null', 'null');
+}
 
-    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x10000000;         if (b < 0x80) return val;
-    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x800000000;        if (b < 0x80) return val;
-    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x40000000000;      if (b < 0x80) return val;
-    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x2000000000000;    if (b < 0x80) return val;
-    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x100000000000000;  if (b < 0x80) return val;
-    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x8000000000000000; if (b < 0x80) return val;
 
-    throw new Error('Expected varint not more than 10 bytes');
+function formatError(value) {
+  return '[' + Error.prototype.toString.call(value) + ']';
 }
 
-function writeBigVarint(val, pbf) {
-    pbf.realloc(10);
-
-    var maxPos = pbf.pos + 10;
 
-    while (val >= 1) {
-        if (pbf.pos >= maxPos) throw new Error('Given varint doesn\'t fit into 10 bytes');
-        var b = val & 0xff;
-        pbf.buf[pbf.pos++] = b | (val >= 0x80 ? 0x80 : 0);
-        val /= 0x80;
+function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+  var output = [];
+  for (var i = 0, l = value.length; i < l; ++i) {
+    if (hasOwnProperty(value, String(i))) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          String(i), true));
+    } else {
+      output.push('');
+    }
+  }
+  keys.forEach(function(key) {
+    if (!key.match(/^\d+$/)) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          key, true));
     }
+  });
+  return output;
 }
 
-function reallocForRawMessage(startPos, len, pbf) {
-    var extraLen =
-        len <= 0x3fff ? 1 :
-        len <= 0x1fffff ? 2 :
-        len <= 0xfffffff ? 3 : Math.ceil(Math.log(len) / (Math.LN2 * 7));
 
-    // if 1 byte isn't enough for encoding message length, shift the data to the right
-    pbf.realloc(extraLen);
-    for (var i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];
+function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+  var name, str, desc;
+  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
+  if (desc.get) {
+    if (desc.set) {
+      str = ctx.stylize('[Getter/Setter]', 'special');
+    } else {
+      str = ctx.stylize('[Getter]', 'special');
+    }
+  } else {
+    if (desc.set) {
+      str = ctx.stylize('[Setter]', 'special');
+    }
+  }
+  if (!hasOwnProperty(visibleKeys, key)) {
+    name = '[' + key + ']';
+  }
+  if (!str) {
+    if (ctx.seen.indexOf(desc.value) < 0) {
+      if (isNull(recurseTimes)) {
+        str = formatValue(ctx, desc.value, null);
+      } else {
+        str = formatValue(ctx, desc.value, recurseTimes - 1);
+      }
+      if (str.indexOf('\n') > -1) {
+        if (array) {
+          str = str.split('\n').map(function(line) {
+            return '  ' + line;
+          }).join('\n').substr(2);
+        } else {
+          str = '\n' + str.split('\n').map(function(line) {
+            return '   ' + line;
+          }).join('\n');
+        }
+      }
+    } else {
+      str = ctx.stylize('[Circular]', 'special');
+    }
+  }
+  if (isUndefined(name)) {
+    if (array && key.match(/^\d+$/)) {
+      return str;
+    }
+    name = JSON.stringify('' + key);
+    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+      name = name.substr(1, name.length - 2);
+      name = ctx.stylize(name, 'name');
+    } else {
+      name = name.replace(/'/g, "\\'")
+                 .replace(/\\"/g, '"')
+                 .replace(/(^"|"$)/g, "'");
+      name = ctx.stylize(name, 'string');
+    }
+  }
+
+  return name + ': ' + str;
 }
 
-function writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }
-function writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }
-function writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }
-function writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }
-function writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }
-function writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }
-function writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }
-function writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }
-function writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }
 
-}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+function reduceToSingleString(output, base, braces) {
+  var numLinesEst = 0;
+  var length = output.reduce(function(prev, cur) {
+    numLinesEst++;
+    if (cur.indexOf('\n') >= 0) numLinesEst++;
+    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
+  }, 0);
+
+  if (length > 60) {
+    return braces[0] +
+           (base === '' ? '' : base + '\n ') +
+           ' ' +
+           output.join(',\n  ') +
+           ' ' +
+           braces[1];
+  }
 
-},{"./buffer":188}],190:[function(_dereq_,module,exports){
-arguments[4][4][0].apply(exports,arguments)
-},{"dup":4}],191:[function(_dereq_,module,exports){
-/*!
- * strip-comments <https://github.com/jonschlinkert/strip-comments>
- *
- * Copyright (c) 2014 Jon Schlinkert, contributors.
- * Licensed under the MIT license.
- */
+  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+}
 
-'use stric';
 
-var reBlock = '\\/\\*';
-var reBlockIgnore = '\\/\\*(?!\\*?\\!)';
-var reBlockEnd = '(.|[\\r\\n]|\\n)*?\\*\\/\\n?\\n?';
-var reLine = /(^|[^\S\n])(?:\/\/)([\s\S]+?)$/gm;
-var reLineIgnore = /(^|[^\S\n])(?:\/\/[^!])([\s\S]+?)$/gm;
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
+function isArray(ar) {
+  return Array.isArray(ar);
+}
+exports.isArray = isArray;
 
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
 
-/**
- * Strip all comments
- *
- * {%= docs("strip") %}
- *
- * @param   {String} `str`  file contents or string to strip.
- * @param   {Object} `opts`  options are passed to `.block`, and `.line`
- * @return  {String} String without comments.
- * @api public
- */
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
 
-var strip = module.exports = function(str, opts) {
-  return str ? strip.block(strip.line(str, opts), opts) : '';
-};
+function isNullOrUndefined(arg) {
+  return arg == null;
+}
+exports.isNullOrUndefined = isNullOrUndefined;
 
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
 
-/**
- * Strip only block comments, optionally leaving protected comments
- * (e.g. `/*!`) intact.
- *
- * {%= docs("block") %}
- *
- * @param   {String} `str`  file content or string to strip to
- * @param   {Object} `opts`  if `safe:true`, strip only comments that do not start with `/*!` or `/**!`
- * @return  {String} String without block comments.
- * @api public
- */
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
 
-strip.block = function(str, opts) {
-  opts = opts || {};
-  var re = new RegExp(reBlock + reBlockEnd, 'gm');
-  if(opts.safe) {
-    re = new RegExp(reBlockIgnore + reBlockEnd, 'gm');
-  }
-  return str ? str.replace(re, '') : '';
-};
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
 
+function isUndefined(arg) {
+  return arg === void 0;
+}
+exports.isUndefined = isUndefined;
 
-/**
- * Strip only line comments
- *
- * {%= docs("line") %}
- *
- * @param   {String} `str`  file content or string to strip to
- * @param   {Object} `opts`  if `safe:true`, strip all that not starts with `//!`
- * @return  {String} String without line comments.
- * @api public
- */
+function isRegExp(re) {
+  return isObject(re) && objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
 
-strip.line = function(str, opts) {
-  opts = opts || {};
-  var re = reLine;
-  if(opts.safe) {
-    re = reLineIgnore;
-  }
-  return str ? str.replace(re, '') : '';
-};
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+exports.isObject = isObject;
 
-},{}],192:[function(_dereq_,module,exports){
-// https://github.com/topojson/topojson-client Version 2.1.0. Copyright 2016 Mike Bostock.
-(function (global, factory) {
-  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-  typeof define === 'function' && define.amd ? define(['exports'], factory) :
-  (factory((global.topojson = global.topojson || {})));
-}(this, (function (exports) { 'use strict';
+function isDate(d) {
+  return isObject(d) && objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
 
-var reverse = function(array, n) {
-  var t, j = array.length, i = j - n;
-  while (i < --j) t = array[i], array[i++] = array[j], array[j] = t;
-};
+function isError(e) {
+  return isObject(e) &&
+      (objectToString(e) === '[object Error]' || e instanceof Error);
+}
+exports.isError = isError;
 
-var identity = function(x) {
-  return x;
-};
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
 
-var transform = function(topology) {
-  if ((transform = topology.transform) == null) return identity;
-  var transform,
-      x0,
-      y0,
-      kx = transform.scale[0],
-      ky = transform.scale[1],
-      dx = transform.translate[0],
-      dy = transform.translate[1];
-  return function(point, i) {
-    if (!i) x0 = y0 = 0;
-    point[0] = (x0 += point[0]) * kx + dx;
-    point[1] = (y0 += point[1]) * ky + dy;
-    return point;
-  };
-};
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
 
-var feature = function(topology, o) {
-  return o.type === "GeometryCollection"
-      ? {type: "FeatureCollection", features: o.geometries.map(function(o) { return feature$1(topology, o); })}
-      : feature$1(topology, o);
-};
+exports.isBuffer = _dereq_('./support/isBuffer');
 
-function feature$1(topology, o) {
-  var id = o.id,
-      bbox = o.bbox,
-      properties = o.properties == null ? {} : o.properties,
-      geometry = object(topology, o);
-  return id == null && bbox == null ? {type: "Feature", properties: properties, geometry: geometry}
-      : bbox == null ? {type: "Feature", id: id, properties: properties, geometry: geometry}
-      : {type: "Feature", id: id, bbox: bbox, properties: properties, geometry: geometry};
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
 }
 
-function object(topology, o) {
-  var transformPoint = transform(topology),
-      arcs = topology.arcs;
 
-  function arc(i, points) {
-    if (points.length) points.pop();
-    for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length; k < n; ++k) {
-      points.push(transformPoint(a[k].slice(), k));
-    }
-    if (i < 0) reverse(points, n);
-  }
+function pad(n) {
+  return n < 10 ? '0' + n.toString(10) : n.toString(10);
+}
 
-  function point(p) {
-    return transformPoint(p.slice());
-  }
 
-  function line(arcs) {
-    var points = [];
-    for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points);
-    if (points.length < 2) points.push(points[0].slice());
-    return points;
-  }
+var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
+              'Oct', 'Nov', 'Dec'];
 
-  function ring(arcs) {
-    var points = line(arcs);
-    while (points.length < 4) points.push(points[0].slice());
-    return points;
-  }
+// 26 Feb 16:19:34
+function timestamp() {
+  var d = new Date();
+  var time = [pad(d.getHours()),
+              pad(d.getMinutes()),
+              pad(d.getSeconds())].join(':');
+  return [d.getDate(), months[d.getMonth()], time].join(' ');
+}
 
-  function polygon(arcs) {
-    return arcs.map(ring);
-  }
 
-  function geometry(o) {
-    var type = o.type, coordinates;
-    switch (type) {
-      case "GeometryCollection": return {type: type, geometries: o.geometries.map(geometry)};
-      case "Point": coordinates = point(o.coordinates); break;
-      case "MultiPoint": coordinates = o.coordinates.map(point); break;
-      case "LineString": coordinates = line(o.arcs); break;
-      case "MultiLineString": coordinates = o.arcs.map(line); break;
-      case "Polygon": coordinates = polygon(o.arcs); break;
-      case "MultiPolygon": coordinates = o.arcs.map(polygon); break;
-      default: return null;
-    }
-    return {type: type, coordinates: coordinates};
-  }
+// log is just a thin wrapper to console.log that prepends a timestamp
+exports.log = function() {
+  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
+};
 
-  return geometry(o);
-}
 
-// export {default as bbox} from "./src/bbox";
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * The Function.prototype.inherits from lang.js rewritten as a standalone
+ * function (not on Function.prototype). NOTE: If this file is to be loaded
+ * during bootstrapping this function needs to be rewritten using some native
+ * functions as prototype setup using normal JavaScript does not work as
+ * expected during bootstrapping (see mirror.js in r114903).
+ *
+ * @param {function} ctor Constructor function which needs to inherit the
+ *     prototype.
+ * @param {function} superCtor Constructor function to inherit prototype from.
+ */
+exports.inherits = _dereq_('inherits');
 
-// export {default as mesh, meshArcs} from "./src/mesh";
-// export {default as merge, mergeArcs} from "./src/merge";
-// export {default as neighbors} from "./src/neighbors";
-// export {default as quantize} from "./src/quantize";
-// export {default as transform} from "./src/transform";
-// export {default as untransform} from "./src/untransform";
+exports._extend = function(origin, add) {
+  // Don't do anything if add isn't an object
+  if (!add || !isObject(add)) return origin;
 
-exports.feature = feature;
+  var keys = Object.keys(add);
+  var i = keys.length;
+  while (i--) {
+    origin[keys[i]] = add[keys[i]];
+  }
+  return origin;
+};
 
-Object.defineProperty(exports, '__esModule', { value: true });
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
 
-})));
+}).call(this,_dereq_('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 
-},{}],193:[function(_dereq_,module,exports){
+},{"./support/isBuffer":190,"_process":184,"inherits":189}],192:[function(_dereq_,module,exports){
 module.exports.VectorTile = _dereq_('./lib/vectortile.js');
 module.exports.VectorTileFeature = _dereq_('./lib/vectortilefeature.js');
 module.exports.VectorTileLayer = _dereq_('./lib/vectortilelayer.js');
 
-},{"./lib/vectortile.js":194,"./lib/vectortilefeature.js":195,"./lib/vectortilelayer.js":196}],194:[function(_dereq_,module,exports){
+},{"./lib/vectortile.js":193,"./lib/vectortilefeature.js":194,"./lib/vectortilelayer.js":195}],193:[function(_dereq_,module,exports){
 'use strict';
 
 var VectorTileLayer = _dereq_('./vectortilelayer');
@@ -22871,7 +23002,7 @@ function readTile(tag, layers, pbf) {
 }
 
 
-},{"./vectortilelayer":196}],195:[function(_dereq_,module,exports){
+},{"./vectortilelayer":195}],194:[function(_dereq_,module,exports){
 'use strict';
 
 var Point = _dereq_('point-geometry');
@@ -23106,7 +23237,7 @@ function signedArea(ring) {
     return sum;
 }
 
-},{"point-geometry":197}],196:[function(_dereq_,module,exports){
+},{"point-geometry":182}],195:[function(_dereq_,module,exports){
 'use strict';
 
 var VectorTileFeature = _dereq_('./vectortilefeature.js');
@@ -23169,140 +23300,7 @@ VectorTileLayer.prototype.feature = function(i) {
     return new VectorTileFeature(this._pbf, end, this.extent, this._keys, this._values);
 };
 
-},{"./vectortilefeature.js":195}],197:[function(_dereq_,module,exports){
-'use strict';
-
-module.exports = Point;
-
-function Point(x, y) {
-    this.x = x;
-    this.y = y;
-}
-
-Point.prototype = {
-    clone: function() { return new Point(this.x, this.y); },
-
-    add:     function(p) { return this.clone()._add(p);     },
-    sub:     function(p) { return this.clone()._sub(p);     },
-    mult:    function(k) { return this.clone()._mult(k);    },
-    div:     function(k) { return this.clone()._div(k);     },
-    rotate:  function(a) { return this.clone()._rotate(a);  },
-    matMult: function(m) { return this.clone()._matMult(m); },
-    unit:    function() { return this.clone()._unit(); },
-    perp:    function() { return this.clone()._perp(); },
-    round:   function() { return this.clone()._round(); },
-
-    mag: function() {
-        return Math.sqrt(this.x * this.x + this.y * this.y);
-    },
-
-    equals: function(p) {
-        return this.x === p.x &&
-               this.y === p.y;
-    },
-
-    dist: function(p) {
-        return Math.sqrt(this.distSqr(p));
-    },
-
-    distSqr: function(p) {
-        var dx = p.x - this.x,
-            dy = p.y - this.y;
-        return dx * dx + dy * dy;
-    },
-
-    angle: function() {
-        return Math.atan2(this.y, this.x);
-    },
-
-    angleTo: function(b) {
-        return Math.atan2(this.y - b.y, this.x - b.x);
-    },
-
-    angleWith: function(b) {
-        return this.angleWithSep(b.x, b.y);
-    },
-
-    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.
-    angleWithSep: function(x, y) {
-        return Math.atan2(
-            this.x * y - this.y * x,
-            this.x * x + this.y * y);
-    },
-
-    _matMult: function(m) {
-        var x = m[0] * this.x + m[1] * this.y,
-            y = m[2] * this.x + m[3] * this.y;
-        this.x = x;
-        this.y = y;
-        return this;
-    },
-
-    _add: function(p) {
-        this.x += p.x;
-        this.y += p.y;
-        return this;
-    },
-
-    _sub: function(p) {
-        this.x -= p.x;
-        this.y -= p.y;
-        return this;
-    },
-
-    _mult: function(k) {
-        this.x *= k;
-        this.y *= k;
-        return this;
-    },
-
-    _div: function(k) {
-        this.x /= k;
-        this.y /= k;
-        return this;
-    },
-
-    _unit: function() {
-        this._div(this.mag());
-        return this;
-    },
-
-    _perp: function() {
-        var y = this.y;
-        this.y = this.x;
-        this.x = -y;
-        return this;
-    },
-
-    _rotate: function(angle) {
-        var cos = Math.cos(angle),
-            sin = Math.sin(angle),
-            x = cos * this.x - sin * this.y,
-            y = sin * this.x + cos * this.y;
-        this.x = x;
-        this.y = y;
-        return this;
-    },
-
-    _round: function() {
-        this.x = Math.round(this.x);
-        this.y = Math.round(this.y);
-        return this;
-    }
-};
-
-// constructs Point from an array if necessary
-Point.convert = function (a) {
-    if (a instanceof Point) {
-        return a;
-    }
-    if (Array.isArray(a)) {
-        return new Point(a[0], a[1]);
-    }
-    return a;
-};
-
-},{}],198:[function(_dereq_,module,exports){
+},{"./vectortilefeature.js":194}],196:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -23344,7 +23342,7 @@ function isCoordOutsideTile(coord, tolerance) {
     return coord[0] <= tile_min.x + tolerance || coord[0] >= tile_max.x - tolerance || coord[1] >= tile_min.y - tolerance || coord[1] <= tile_max.y + tolerance;
 }
 
-},{"../geo":203}],199:[function(_dereq_,module,exports){
+},{"../geo":201}],197:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -23467,7 +23465,7 @@ function buildQuadsForPoints(points, vertex_data, vertex_template, _ref, _ref2)
     }
 }
 
-},{"./common":198}],200:[function(_dereq_,module,exports){
+},{"./common":196}],198:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -23668,7 +23666,7 @@ function triangulatePolygon(data) {
     return (0, _earcut2.default)(data.vertices, data.holes, data.dimensions);
 }
 
-},{"../geo":203,"../vector":272,"./common":198,"earcut":77}],201:[function(_dereq_,module,exports){
+},{"../geo":201,"../vector":270,"./common":196,"earcut":72}],199:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -24287,7 +24285,7 @@ function permuteLine(line, startIndex) {
     return newLine;
 }
 
-},{"../geo":203,"../vector":272,"./common":198}],202:[function(_dereq_,module,exports){
+},{"../geo":201,"../vector":270,"./common":196}],200:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -24654,7 +24652,7 @@ var FlatCamera = function (_IsometricCamera) {
     return FlatCamera;
 }(IsometricCamera);
 
-},{"./gl/shader_program":209,"./utils/gl-matrix":259,"./utils/utils":269}],203:[function(_dereq_,module,exports){
+},{"./gl/shader_program":207,"./utils/gl-matrix":257,"./utils/utils":267}],201:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -24778,13 +24776,6 @@ Geo.latLngToMeters = function (_ref6) {
     return [x, y];
 };
 
-Geo.wrapLng = function (x) {
-    if (x > 180 || x < -180) {
-        x = ((x + 180) % 360 + 360) % 360 - 180;
-    }
-    return x;
-};
-
 // Run an in-place transform function on each cooordinate in a GeoJSON geometry
 Geo.transformGeometry = function (geometry, transform) {
     if (geometry == null) {
@@ -24942,7 +24933,7 @@ Geo.ringWinding = function (ring) {
     // return undefined on zero area polygon
 };
 
-},{}],204:[function(_dereq_,module,exports){
+},{}],202:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -24963,7 +24954,7 @@ gl.INT = 0x1404;
 gl.UNSIGNED_INT = 0x1405;
 gl.FLOAT = 0x1406;
 
-},{}],205:[function(_dereq_,module,exports){
+},{}],203:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -25019,7 +25010,7 @@ Context.resize = function (gl, width, height, device_pixel_ratio) {
     gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
 };
 
-},{}],206:[function(_dereq_,module,exports){
+},{}],204:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -25049,7 +25040,7 @@ function getExtension(gl, name) {
     return exts[name];
 }
 
-},{}],207:[function(_dereq_,module,exports){
+},{}],205:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -25333,7 +25324,7 @@ GLSL.expandVec4 = function (v) {
     }
 };
 
-},{}],208:[function(_dereq_,module,exports){
+},{}],206:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -25436,7 +25427,7 @@ var RenderStateManager = function RenderStateManager(gl) {
 
 exports.default = RenderStateManager;
 
-},{}],209:[function(_dereq_,module,exports){
+},{}],207:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -26283,7 +26274,7 @@ ShaderProgram.createShader = function (gl, source, stype) {
     return shader;
 };
 
-},{"../utils/hash":260,"../utils/log":261,"./extensions":206,"./glsl":207,"./texture":210,"gl-shader-errors":96,"strip-comments":191}],210:[function(_dereq_,module,exports){
+},{"../utils/hash":258,"../utils/log":259,"./extensions":204,"./glsl":205,"./texture":208,"gl-shader-errors":92,"strip-comments":186}],208:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -26329,8 +26320,6 @@ var Texture = function () {
 
         this.name = name;
         this.retain_count = 0;
-        this.source = null;
-        this.source_type = null;
         this.config_type = null;
         this.loading = null; // a Promise object to track the loading state of this texture
         this.loaded = false; // successfully loaded as expected
@@ -26353,7 +26342,7 @@ var Texture = function () {
 
         // Cache texture instance and definition
         Texture.textures[this.name] = this;
-        Texture.texture_configs[this.name] = Object.assign({ name: name }, options);
+        Texture.texture_configs[this.name] = JSON.stringify(Object.assign({ name: name }, options));
 
         this.load(options);
         (0, _log2.default)('trace', 'creating Texture ' + this.name);
@@ -26381,6 +26370,7 @@ var Texture = function () {
             delete this.data;
             this.data = null;
             delete Texture.textures[this.name];
+            delete Texture.texture_configs[this.name];
             this.valid = false;
             (0, _log2.default)('trace', 'destroying Texture ' + this.name);
         }
@@ -26462,8 +26452,6 @@ var Texture = function () {
             }
 
             this.url = url; // save URL reference (will be overwritten when element is loaded below)
-            this.source = this.url;
-            this.source_type = 'url';
 
             this.loading = new Promise(function (resolve, reject) {
                 var image = new Image();
@@ -26472,8 +26460,8 @@ var Texture = function () {
                         _this2.setElement(image, options);
                     } catch (e) {
                         _this2.loaded = false;
-                        (0, _log2.default)('warn', 'Texture \'' + _this2.name + '\': failed to load url: \'' + _this2.source + '\'', e, options);
-                        Texture.trigger('warning', { message: 'Failed to load texture from ' + _this2.source, error: e, texture: options });
+                        (0, _log2.default)('warn', 'Texture \'' + _this2.name + '\': failed to load url: \'' + _this2.url + '\'', e, options);
+                        Texture.trigger('warning', { message: 'Failed to load texture from ' + _this2.url, error: e, texture: options });
                     }
 
                     _this2.loaded = true;
@@ -26482,18 +26470,18 @@ var Texture = function () {
                 image.onerror = function (e) {
                     // Warn and resolve on error
                     _this2.loaded = false;
-                    (0, _log2.default)('warn', 'Texture \'' + _this2.name + '\': failed to load url: \'' + _this2.source + '\'', e, options);
-                    Texture.trigger('warning', { message: 'Failed to load texture from ' + _this2.source, error: e, texture: options });
+                    (0, _log2.default)('warn', 'Texture \'' + _this2.name + '\': failed to load url: \'' + _this2.url + '\'', e, options);
+                    Texture.trigger('warning', { message: 'Failed to load texture from ' + _this2.url, error: e, texture: options });
                     resolve(_this2);
                 };
 
                 // Safari has a bug loading data-URL images with CORS enabled, so it must be disabled in that case
                 // https://bugs.webkit.org/show_bug.cgi?id=123978
-                if (!(_utils2.default.isSafari() && _this2.source.slice(0, 5) === 'data:')) {
+                if (!(_utils2.default.isSafari() && _this2.url.slice(0, 5) === 'data:')) {
                     image.crossOrigin = 'anonymous';
                 }
 
-                image.src = _this2.source;
+                image.src = _this2.url;
             });
             return this.loading;
         }
@@ -26508,15 +26496,12 @@ var Texture = function () {
             this.width = width;
             this.height = height;
 
-            this.source = data;
-            this.source_type = 'data';
-
             // Convert regular array to typed array
-            if (Array.isArray(this.source)) {
-                this.source = new Uint8Array(this.source);
+            if (Array.isArray(data)) {
+                data = new Uint8Array(data);
             }
 
-            this.update(options);
+            this.update(data, options);
             this.setFiltering(options);
 
             this.loaded = true;
@@ -26537,10 +26522,7 @@ var Texture = function () {
             }
 
             if (element instanceof HTMLCanvasElement || element instanceof HTMLImageElement || element instanceof HTMLVideoElement) {
-                this.source = element;
-                this.source_type = 'element';
-
-                this.update(options);
+                this.update(element, options);
                 this.setFiltering(options);
             } else {
                 this.loaded = false;
@@ -26559,8 +26541,8 @@ var Texture = function () {
 
     }, {
         key: 'update',
-        value: function update() {
-            var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+        value: function update(source) {
+            var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
 
             if (!this.valid) {
                 return;
@@ -26571,15 +26553,15 @@ var Texture = function () {
             this.gl.pixelStorei(this.gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, options.UNPACK_PREMULTIPLY_ALPHA_WEBGL || false);
 
             // Image or Canvas element
-            if (this.source instanceof HTMLCanvasElement || this.source instanceof HTMLVideoElement || this.source instanceof HTMLImageElement && this.source.complete) {
+            if (source instanceof HTMLCanvasElement || source instanceof HTMLVideoElement || source instanceof HTMLImageElement && source.complete) {
 
-                this.width = this.source.width;
-                this.height = this.source.height;
-                this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.gl.RGBA, this.gl.UNSIGNED_BYTE, this.source);
+                this.width = source.width;
+                this.height = source.height;
+                this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.gl.RGBA, this.gl.UNSIGNED_BYTE, source);
             }
             // Raw image buffer
-            else if (this.source_type === 'data') {
-                    this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.width, this.height, 0, this.gl.RGBA, this.gl.UNSIGNED_BYTE, this.source);
+            else {
+                    this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.width, this.height, 0, this.gl.RGBA, this.gl.UNSIGNED_BYTE, source);
                 }
 
             Texture.trigger('update', this);
@@ -26750,7 +26732,7 @@ Texture.changed = function (name, config) {
         }
 
         // compare definitions
-        if (JSON.stringify(Texture.texture_configs[name]) === JSON.stringify(Object.assign({ name: name }, config))) {
+        if (Texture.texture_configs[name] === JSON.stringify(Object.assign({ name: name }, config))) {
             return false;
         }
     }
@@ -26825,7 +26807,7 @@ Texture.activeUnit = null;
 _worker_broker2.default.addTarget('Texture', Texture);
 (0, _subscribe2.default)(Texture);
 
-},{"../utils/log":261,"../utils/subscribe":266,"../utils/utils":269,"../utils/worker_broker":271}],211:[function(_dereq_,module,exports){
+},{"../utils/log":259,"../utils/subscribe":264,"../utils/utils":267,"../utils/worker_broker":269}],209:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -26924,7 +26906,7 @@ exports.default = {
     }
 };
 
-},{"../utils/log":261,"./extensions":206}],212:[function(_dereq_,module,exports){
+},{"../utils/log":259,"./extensions":204}],210:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -27090,7 +27072,7 @@ var VBOMesh = function () {
 
 exports.default = VBOMesh;
 
-},{"./shader_program":209,"./vao":211}],213:[function(_dereq_,module,exports){
+},{"./shader_program":207,"./vao":209}],211:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -27248,7 +27230,7 @@ exports.default = VertexData;
 
 VertexData.array_pool = []; // pool of currently available (previously used) buffers (uint8)
 
-},{"../utils/log":261,"./constants":204,"./vertex_elements":214}],214:[function(_dereq_,module,exports){
+},{"../utils/log":259,"./constants":202,"./vertex_elements":212}],212:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -27325,7 +27307,7 @@ function createBuffer(array, overflown) {
 
 _worker_broker2.default.addTarget('VertexElements', VertexElements);
 
-},{"../utils/worker_broker":271}],215:[function(_dereq_,module,exports){
+},{"../utils/worker_broker":269}],213:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -27467,7 +27449,7 @@ var VertexLayout = function () {
 exports.default = VertexLayout;
 VertexLayout.enabled_attribs = {};
 
-},{"./constants":204,"./vertex_data":213}],216:[function(_dereq_,module,exports){
+},{"./constants":202,"./vertex_data":211}],214:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -27643,7 +27625,7 @@ exports.default = Collision = {
     }
 };
 
-},{"../utils/log":261,"./repeat_group":223}],217:[function(_dereq_,module,exports){
+},{"../utils/log":259,"./repeat_group":221}],215:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -27677,7 +27659,7 @@ function boxIntersectsList(a, boxes, callback) {
     }
 }
 
-},{}],218:[function(_dereq_,module,exports){
+},{}],216:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -27820,7 +27802,7 @@ exports.default = Label;
 
 Label.epsilon = 0.9999; // tolerance around collision boxes, prevent perfectly adjacent objects from colliding
 
-},{"../utils/obb":264,"../utils/utils":269,"./intersect":217,"./point_anchor":221}],219:[function(_dereq_,module,exports){
+},{"../utils/obb":262,"../utils/utils":267,"./intersect":215,"./point_anchor":219}],217:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -28720,7 +28702,7 @@ function getAbsAngleDiff(angle1, angle2) {
     return Math.abs(big - small);
 }
 
-},{"../utils/obb":264,"../vector":272,"./label":218}],220:[function(_dereq_,module,exports){
+},{"../utils/obb":262,"../vector":270,"./label":216}],218:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -28934,7 +28916,7 @@ LabelPoint.PLACEMENT = {
     CENTROID: 3 // place labels at center of polygons
 };
 
-},{"../geo":203,"../styles/style_parser":247,"../utils/obb":264,"./label":218,"./point_anchor":221}],221:[function(_dereq_,module,exports){
+},{"../geo":201,"../styles/style_parser":245,"../utils/obb":262,"./label":216,"./point_anchor":219}],219:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -29017,7 +28999,7 @@ exports.default = PointAnchor = {
 
 };
 
-},{}],222:[function(_dereq_,module,exports){
+},{}],220:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -29178,7 +29160,7 @@ function interpolateSegment(p, q, distance) {
     return [ratio * p[0] + (1 - ratio) * q[0], ratio * p[1] + (1 - ratio) * q[1]];
 }
 
-},{"../builders/common":198,"./label_point":220}],223:[function(_dereq_,module,exports){
+},{"../builders/common":196,"./label_point":218}],221:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -29303,7 +29285,7 @@ RepeatGroup.groups = {};
 // will be allowed per group, e.g. set to tile size for one-label-per-tile
 RepeatGroup.max_repeat_dist = _geo2.default.tile_scale;
 
-},{"../geo":203}],224:[function(_dereq_,module,exports){
+},{"../geo":201}],222:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -29388,11 +29370,12 @@ function extendLeaflet(options) {
                     preUpdate: this.options.preUpdate,
                     postUpdate: this.options.postUpdate,
                     continuousZoom: LeafletLayer.leafletVersion === '1.x',
+                    wrapView: this.options.noWrap === true ? false : true,
                     highDensityDisplay: this.options.highDensityDisplay,
                     logLevel: this.options.logLevel,
                     introspection: this.options.introspection,
-                    // advanced option, app will have to manually called scene.update() per frame
-                    disableRenderLoop: this.options.disableRenderLoop
+                    webGLContextOptions: this.options.webGLContextOptions, // override/supplement WebGL context options
+                    disableRenderLoop: this.options.disableRenderLoop // app must call scene.update() per frame
                 });
             },
 
@@ -29422,7 +29405,7 @@ function extendLeaflet(options) {
 
                     _this.scene.view.setPanning(true);
                     var view = map.getCenter();
-                    view.zoom = Math.min(map.getZoom(), map.getMaxZoom() || _geo2.default.default_view_max_zoom);
+                    view.zoom = Math.max(Math.min(map.getZoom(), map.getMaxZoom() || _geo2.default.default_view_max_zoom), map.getMinZoom());
 
                     _this.scene.view.setView(view);
                     if (_this._mapLayerCount > 1) {
@@ -29577,6 +29560,8 @@ function extendLeaflet(options) {
 
                         if (zoom + delta >= this._map.getMaxZoom()) {
                             delta = this._map.getMaxZoom() - zoom; // don't go past max zoom
+                        } else if (zoom + delta <= this._map.getMinZoom()) {
+                            delta = this._map.getMinZoom() - zoom; // don't go past min zoom
                         }
 
                         if (!delta) {
@@ -29669,7 +29654,7 @@ function extendLeaflet(options) {
             },
             updateView: function updateView() {
                 var view = this._map.getCenter();
-                view.zoom = Math.min(this._map.getZoom(), this._map.getMaxZoom() || _geo2.default.default_view_max_zoom);
+                view.zoom = Math.max(Math.min(this._map.getZoom(), this._map.getMaxZoom() || _geo2.default.default_view_max_zoom), this._map.getMinZoom());
                 this.scene.view.setView(view);
             },
             updateSize: function updateSize() {
@@ -29819,7 +29804,7 @@ function extendLeaflet(options) {
     }
 }
 
-},{"./geo":203,"./scene":228,"./utils/debounce":256,"./utils/thread":267}],225:[function(_dereq_,module,exports){
+},{"./geo":201,"./scene":226,"./utils/debounce":254,"./utils/thread":265}],223:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -30252,7 +30237,7 @@ var SpotLight = function (_PointLight) {
 
 Light.types['spotlight'] = SpotLight;
 
-},{"./geo":203,"./gl/glsl":207,"./gl/shader_program":209,"./styles/style_parser":247,"./vector":272}],226:[function(_dereq_,module,exports){
+},{"./geo":201,"./gl/glsl":205,"./gl/shader_program":207,"./styles/style_parser":245,"./vector":270}],224:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -30413,7 +30398,7 @@ exports.default = Material;
 
 Material.block = 'material';
 
-},{"./gl/glsl":207,"./styles/style_parser":247}],227:[function(_dereq_,module,exports){
+},{"./gl/glsl":205,"./styles/style_parser":245}],225:[function(_dereq_,module,exports){
 'use strict';
 
 _dereq_('./utils/polyfills');
@@ -30543,7 +30528,7 @@ var debug = {
     Scene: _scene2.default,
     SceneWorker: _scene_worker.SceneWorker,
     WorkerBroker: _worker_broker2.default,
-    layer_cache: _layer.layer_cache,
+    layerCache: _layer.layerCache,
     StyleManager: _style_manager.StyleManager,
     StyleParser: _style_parser.StyleParser,
     Collision: _collision2.default,
@@ -30575,7 +30560,7 @@ module.exports = {
     version: _version2.default
 };
 
-},{"./geo":203,"./gl/glsl":207,"./gl/shader_program":209,"./gl/texture":210,"./gl/vertex_data":213,"./labels/collision":216,"./leaflet_layer":224,"./light":225,"./material":226,"./scene":228,"./scene_worker":231,"./selection":232,"./sources/data_source":233,"./sources/geojson":234,"./sources/mvt":235,"./sources/raster":236,"./sources/topojson":237,"./styles/layer":239,"./styles/style_manager":246,"./styles/style_parser":247,"./styles/text/canvas_text":248,"./utils/debug_settings":257,"./utils/log":261,"./utils/polyfills":265,"./utils/thread":267,"./utils/utils":269,"./utils/version":270,"./utils/worker_broker":271,"./vector":272,"js-yaml":97,"jszip":133}],228:[function(_dereq_,module,exports){
+},{"./geo":201,"./gl/glsl":205,"./gl/shader_program":207,"./gl/texture":208,"./gl/vertex_data":211,"./labels/collision":214,"./leaflet_layer":222,"./light":223,"./material":224,"./scene":226,"./scene_worker":229,"./selection":230,"./sources/data_source":231,"./sources/geojson":232,"./sources/mvt":233,"./sources/raster":234,"./sources/topojson":235,"./styles/layer":237,"./styles/style_manager":244,"./styles/style_parser":245,"./styles/text/canvas_text":246,"./utils/debug_settings":255,"./utils/log":259,"./utils/polyfills":263,"./utils/thread":265,"./utils/utils":267,"./utils/version":268,"./utils/worker_broker":269,"./vector":270,"js-yaml":97,"jszip":133}],226:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -30656,6 +30641,10 @@ var _render_state = _dereq_('./gl/render_state');
 
 var _render_state2 = _interopRequireDefault(_render_state);
 
+var _canvas_text = _dereq_('./styles/text/canvas_text');
+
+var _canvas_text2 = _interopRequireDefault(_canvas_text);
+
 var _font_manager = _dereq_('./styles/text/font_manager');
 
 var _font_manager2 = _interopRequireDefault(_font_manager);
@@ -30723,6 +30712,8 @@ var Scene = function () {
         this.resetTime();
 
         this.container = options.container;
+        this.canvas = null;
+        this.contextOptions = options.webGLContextOptions;
 
         this.lights = null;
         this.background = null;
@@ -30881,10 +30872,10 @@ var Scene = function () {
             this.container.appendChild(this.canvas);
 
             try {
-                this.gl = _context2.default.getContext(this.canvas, {
-                    alpha: true, premultipliedAlpha: true, // TODO: vary w/scene alpha
+                this.gl = _context2.default.getContext(this.canvas, Object.assign({
+                    alpha: true, premultipliedAlpha: true,
                     device_pixel_ratio: _utils2.default.device_pixel_ratio
-                });
+                }, this.contextOptions));
             } catch (e) {
                 throw new Error("Couldn't create WebGL context. " + "Your browser may not support WebGL, or it's turned off? " + "Visit http://webglreport.com/ for more info.");
             }
@@ -30904,9 +30895,12 @@ var Scene = function () {
             /* jshint -W117 */
             // ignore uninitialized worker src variable (defined in parent scope)
             if (typeof __worker_src__ !== "undefined") {
-                // load from source object using browserify shim (preferred)
-                var src_map_url = '\n//#' + ' sourceMappingURL=' + __worker_src_origin__ + '.map';
-                worker_url = URLs.createObjectURL(new Blob(['(' + __worker_src__ + ')()' + src_map_url], { type: 'application/javascript' }));
+                var source = '(' + __worker_src__ + ')()';
+                if (__worker_src_origin__) {
+                    var origin = __worker_src_origin__.slice(0, __worker_src_origin__.lastIndexOf('/') + 1);
+                    source += '\n//#' + ' sourceMappingURL=' + origin + __worker_src_map__;
+                }
+                worker_url = URLs.createObjectURL(new Blob([source], { type: 'application/javascript' }));
             }
             /* jshint +W117 */
 
@@ -31968,6 +31962,7 @@ var Scene = function () {
         value: function updateViewComplete() {
             if ((this.render_count_changed || this.generation !== this.last_complete_generation) && !this.tile_manager.isLoadingVisibleTiles()) {
                 this.last_complete_generation = this.generation;
+                _canvas_text2.default.pruneTextCache();
                 this.trigger('view_complete');
             }
         }
@@ -32069,6 +32064,26 @@ var Scene = function () {
                     }
                     return counts;
                 },
+                geometrySizeByStyle: function geometrySizeByStyle() {
+                    var sizes = {};
+                    scene.tile_manager.getRenderableTiles().forEach(function (tile) {
+                        for (var style in tile.meshes) {
+                            sizes[style] = sizes[style] || 0;
+                            sizes[style] += tile.meshes[style].buffer_size;
+                        }
+                    });
+                    return sizes;
+                },
+                geometrySizeByBaseStyle: function geometrySizeByBaseStyle() {
+                    var style_sizes = scene.debug.geometrySizeByStyle();
+                    var sizes = {};
+                    for (var style in style_sizes) {
+                        var base = scene.styles[style].baseStyle();
+                        sizes[base] = sizes[base] || 0;
+                        sizes[base] += style_sizes[style];
+                    }
+                    return sizes;
+                },
                 renderableTilesCount: function renderableTilesCount() {
                     return scene.tile_manager.getRenderableTiles().length;
                 }
@@ -32092,7 +32107,7 @@ exports.default = Scene;
 Scene.id = 0; // unique id for a scene instance
 Scene.generation = 0; // id that is incremented each time a scene config is re-parsed
 
-},{"./gl/context":205,"./gl/render_state":208,"./gl/shader_program":209,"./gl/texture":210,"./gl/vao":211,"./light":225,"./scene_loader":230,"./selection":232,"./sources/data_source":233,"./styles/style":245,"./styles/style_manager":246,"./styles/style_parser":247,"./styles/text/font_manager":249,"./tile_manager":254,"./utils/log":261,"./utils/media_capture":262,"./utils/subscribe":266,"./utils/urls":268,"./utils/utils":269,"./utils/worker_broker":271,"./view":273}],229:[function(_dereq_,module,exports){
+},{"./gl/context":203,"./gl/render_state":206,"./gl/shader_program":207,"./gl/texture":208,"./gl/vao":209,"./light":223,"./scene_loader":228,"./selection":230,"./sources/data_source":231,"./styles/style":243,"./styles/style_manager":244,"./styles/style_parser":245,"./styles/text/canvas_text":246,"./styles/text/font_manager":247,"./tile_manager":252,"./utils/log":259,"./utils/media_capture":260,"./utils/subscribe":264,"./utils/urls":266,"./utils/utils":267,"./utils/worker_broker":269,"./view":271}],227:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -32413,7 +32428,7 @@ function loadResource(source) {
     });
 }
 
-},{"./utils/urls":268,"./utils/utils":269,"js-yaml":97,"jszip":133}],230:[function(_dereq_,module,exports){
+},{"./utils/urls":266,"./utils/utils":267,"js-yaml":97,"jszip":133}],228:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -32855,7 +32870,7 @@ function flattenProperties(obj) {
 
 (0, _subscribe2.default)(SceneLoader);
 
-},{"./gl/glsl":207,"./scene_bundle":229,"./utils/log":261,"./utils/merge":263,"./utils/subscribe":266,"./utils/urls":268}],231:[function(_dereq_,module,exports){
+},{"./gl/glsl":205,"./scene_bundle":227,"./utils/log":259,"./utils/merge":261,"./utils/subscribe":264,"./utils/urls":266}],229:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -33187,7 +33202,7 @@ if (_thread2.default.is_worker) {
     _worker_broker2.default.addTarget('self', self);
 }
 
-},{"./gl/texture":210,"./selection":232,"./sources/data_source":233,"./styles/layer":239,"./styles/style_manager":246,"./styles/style_parser":247,"./tile":253,"./utils/log":261,"./utils/thread":267,"./utils/utils":269,"./utils/worker_broker":271}],232:[function(_dereq_,module,exports){
+},{"./gl/texture":208,"./selection":230,"./sources/data_source":231,"./styles/layer":237,"./styles/style_manager":244,"./styles/style_parser":245,"./tile":251,"./utils/log":259,"./utils/thread":265,"./utils/utils":267,"./utils/worker_broker":269}],230:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -33524,7 +33539,7 @@ FeatureSelection.map_entry = 0;
 FeatureSelection.map_prefix = 0; // set by worker to worker id #
 FeatureSelection.defaultColor = [0, 0, 0, 1];
 
-},{"./gl/texture":210,"./utils/log":261,"./utils/worker_broker":271}],233:[function(_dereq_,module,exports){
+},{"./gl/texture":208,"./utils/log":259,"./utils/worker_broker":269}],231:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -34006,7 +34021,7 @@ var NetworkTileSource = exports.NetworkTileSource = function (_NetworkSource) {
     return NetworkTileSource;
 }(NetworkSource);
 
-},{"../geo":203,"../utils/errors":258,"../utils/log":261,"../utils/urls":268,"../utils/utils":269}],234:[function(_dereq_,module,exports){
+},{"../geo":201,"../utils/errors":256,"../utils/log":259,"../utils/urls":266,"../utils/utils":267}],232:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -34354,7 +34369,7 @@ function getCentroidFeatureForPolygon(coordinates, properties, newProperties) {
     };
 }
 
-},{"../geo":203,"../utils/log":261,"./data_source":233,"./mvt":235,"geojson-vt":82}],235:[function(_dereq_,module,exports){
+},{"../geo":201,"../utils/log":259,"./data_source":231,"./mvt":233,"geojson-vt":78}],233:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -34523,7 +34538,7 @@ function decodeMultiPolygon(geom) {
 
 _data_source2.default.register(MVTSource, 'MVT');
 
-},{"../geo":203,"./data_source":233,"pbf":189,"vector-tile":193}],236:[function(_dereq_,module,exports){
+},{"../geo":201,"./data_source":231,"pbf":181,"vector-tile":192}],234:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -34621,7 +34636,7 @@ var RasterTileSource = exports.RasterTileSource = function (_NetworkTileSource)
 
 _data_source2.default.register(RasterTileSource, 'Raster');
 
-},{"../geo":203,"../tile":253,"./data_source":233}],237:[function(_dereq_,module,exports){
+},{"../geo":201,"../tile":251,"./data_source":231}],235:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -34749,7 +34764,7 @@ var TopoJSONTileSource = exports.TopoJSONTileSource = function (_GeoJSONTileSour
 
 _data_source2.default.register(TopoJSONTileSource, 'TopoJSON'); // prefered shorter name
 
-},{"./data_source":233,"./geojson":234,"topojson-client":192}],238:[function(_dereq_,module,exports){
+},{"./data_source":231,"./geojson":232,"topojson-client":187}],236:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -34906,13 +34921,13 @@ function buildFilter(filter, options) {
     return new Function('context', 'return ' + filterToString(parseFilter(filter, options)) + ';');
 }
 
-},{}],239:[function(_dereq_,module,exports){
+},{}],237:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
     value: true
 });
-exports.LayerTree = exports.LayerLeaf = exports.layer_cache = exports.whiteList = undefined;
+exports.LayerTree = exports.LayerLeaf = exports.reserved = undefined;
 
 var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
 
@@ -34920,10 +34935,11 @@ var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol
 
 var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
 
+exports.layerCache = layerCache;
 exports.mergeTrees = mergeTrees;
 exports.groupProps = groupProps;
 exports.calculateDraw = calculateDraw;
-exports.parseLayerTree = parseLayerTree;
+exports.parseLayerNode = parseLayerNode;
 exports.parseLayers = parseLayers;
 exports.matchFeature = matchFeature;
 
@@ -34954,9 +34970,12 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
 
 // N.B.: 'visible' is legacy compatibility for 'enabled'
-var whiteList = exports.whiteList = ['filter', 'draw', 'visible', 'enabled', 'data'];
+var reserved = exports.reserved = ['filter', 'draw', 'visible', 'enabled', 'data'];
 
-var layer_cache = exports.layer_cache = {};
+var layer_cache = {};
+function layerCache() {
+    return layer_cache;
+}
 
 function cacheKey(layers) {
     if (layers.length > 1) {
@@ -34975,10 +34994,6 @@ function mergeTrees(matchingTrees, group) {
     var draws = void 0,
         treeDepth = 0;
 
-    var draw = {
-        visible: true // visible by default
-    };
-
     // Find deepest tree
     for (var t = 0; t < matchingTrees.length; t++) {
         if (matchingTrees[t].length > treeDepth) {
@@ -34991,6 +35006,10 @@ function mergeTrees(matchingTrees, group) {
         return null;
     }
 
+    // Merged draw group object
+    var draw = {
+        visible: true };
+
     // Iterate trees in parallel
 
     var _loop = function _loop(x) {
@@ -35040,7 +35059,8 @@ var Layer = function () {
             draw = _ref.draw,
             visible = _ref.visible,
             enabled = _ref.enabled,
-            filter = _ref.filter;
+            filter = _ref.filter,
+            styles = _ref.styles;
 
         _classCallCheck(this, Layer);
 
@@ -35051,6 +35071,7 @@ var Layer = function () {
         this.full_name = this.parent ? this.parent.full_name + ':' + this.name : this.name;
         this.draw = draw;
         this.filter = filter;
+        this.styles = styles;
         this.is_built = false;
 
         enabled = enabled === undefined ? visible : enabled; // `visible` property is backwards compatible for `enabled`
@@ -35231,9 +35252,10 @@ var Layer = function () {
             }
 
             // any remaining filter (more complex matches or dynamic function)
+            var match = void 0;
             if (this.filter instanceof Function) {
                 try {
-                    return this.filter(context);
+                    match = this.filter(context);
                 } catch (error) {
                     // Filter function error
                     var msg = 'Filter for this ' + this.full_name + ': `filter: ' + this.filter_original + '` ';
@@ -35241,8 +35263,18 @@ var Layer = function () {
                     (0, _log2.default)('error', msg, context.feature);
                 }
             } else {
-                return this.filter == null;
+                match = this.filter == null;
+            }
+
+            if (match) {
+                if (this.children_to_parse) {
+                    parseLayerChildren(this, this.children_to_parse, this.styles);
+                    delete this.children_to_parse;
+                }
+
+                return true;
             }
+            return false;
         }
     }]);
 
@@ -35304,12 +35336,12 @@ var LayerTree = exports.LayerTree = function (_Layer2) {
                     var draw_keys = {};
 
                     for (var r = 0; r < draw_groups.length; r++) {
-                        var layer = draw_groups[r];
-                        if (!layer) {
+                        var stack = draw_groups[r];
+                        if (!stack) {
                             continue;
                         }
-                        for (var g = 0; g < layer.length; g++) {
-                            var group = layer[g];
+                        for (var g = 0; g < stack.length; g++) {
+                            var group = stack[g];
                             for (var key in group) {
                                 draw_keys[key] = true;
                             }
@@ -35329,6 +35361,7 @@ var LayerTree = exports.LayerTree = function (_Layer2) {
                             layer_cache[cache_key][draw_key].layers = layers.map(function (x) {
                                 return x && x.full_name;
                             });
+                            layer_cache[cache_key][draw_key].group = draw_key;
                         }
                     }
 
@@ -35355,8 +35388,8 @@ var FilterOptions = {
     }
 };
 
-function isWhiteListed(key) {
-    return whiteList.indexOf(key) > -1;
+function isReserved(key) {
+    return reserved.indexOf(key) > -1;
 }
 
 function isEmpty(obj) {
@@ -35364,17 +35397,17 @@ function isEmpty(obj) {
 }
 
 function groupProps(obj) {
-    var whiteListed = {},
-        nonWhiteListed = {};
+    var reserved = {},
+        children = {};
 
     for (var key in obj) {
-        if (isWhiteListed(key)) {
-            whiteListed[key] = obj[key];
+        if (isReserved(key)) {
+            reserved[key] = obj[key];
         } else {
-            nonWhiteListed[key] = obj[key];
+            children[key] = obj[key];
         }
     }
-    return [whiteListed, nonWhiteListed];
+    return [reserved, children];
 }
 
 function calculateDraw(layer) {
@@ -35390,18 +35423,18 @@ function calculateDraw(layer) {
     return draw;
 }
 
-function parseLayerTree(name, layer, parent, styles) {
+function parseLayerNode(name, layer, parent, styles) {
 
     layer = layer == null ? {} : layer;
 
-    var properties = { name: name, layer: layer, parent: parent };
+    var properties = { name: name, layer: layer, parent: parent, styles: styles };
 
     var _groupProps = groupProps(layer),
         _groupProps2 = _slicedToArray(_groupProps, 2),
-        whiteListed = _groupProps2[0],
-        nonWhiteListed = _groupProps2[1];
+        reserved = _groupProps2[0],
+        children = _groupProps2[1];
 
-    var empty = isEmpty(nonWhiteListed);
+    var empty = isEmpty(children);
     var Create = void 0;
 
     if (empty && parent != null) {
@@ -35410,48 +35443,50 @@ function parseLayerTree(name, layer, parent, styles) {
         Create = LayerTree;
     }
 
-    var r = new Create(Object.assign(properties, whiteListed));
+    var r = new Create(Object.assign(properties, reserved));
 
     // only process child layers if this layer is enabled
     if (r.enabled) {
         if (parent) {
             parent.addLayer(r);
         }
+        r.children_to_parse = empty ? null : children;
+    }
 
-        if (!empty) {
-            for (var key in nonWhiteListed) {
-                var property = nonWhiteListed[key];
-                if ((typeof property === 'undefined' ? 'undefined' : _typeof(property)) === 'object' && !Array.isArray(property)) {
-                    parseLayerTree(key, property, r, styles);
-                } else {
-                    // Invalid layer
-                    var msg = 'Layer value must be an object: cannot create layer \'' + key + ': ' + JSON.stringify(property) + '\'';
-                    msg += ', under parent layer \'' + r.full_name + '\'.';
+    return r;
+}
 
-                    // If the parent is a style name, this may be an incorrectly nested layer
-                    if (styles[r.name]) {
-                        msg += ' The parent name \'' + r.name + '\' is also the name of a style, did you mean to create a \'draw\' group';
-                        if (parent) {
-                            msg += ' under \'' + parent.name + '\'';
-                        }
-                        msg += ' instead?';
-                    }
-                    (0, _log2.default)('warn', msg); // TODO: fire external event that clients to subscribe to
+function parseLayerChildren(parent, children, styles) {
+    for (var key in children) {
+        var child = children[key];
+        if ((typeof child === 'undefined' ? 'undefined' : _typeof(child)) === 'object' && !Array.isArray(child)) {
+            parseLayerNode(key, child, parent, styles);
+        } else {
+            // Invalid layer
+            var msg = 'Layer value must be an object: cannot create layer \'' + key + ': ' + JSON.stringify(child) + '\'';
+            msg += ', under parent layer \'' + parent.full_name + '\'.';
+
+            // If the parent is a style name, this may be an incorrectly nested layer
+            if (styles[parent.name]) {
+                msg += ' The parent name \'' + parent.name + '\' is also the name of a style, did you mean to create a \'draw\' group';
+                if (parent.parent) {
+                    msg += ' under \'' + parent.parent.name + '\'';
                 }
+                msg += ' instead?';
             }
+            (0, _log2.default)('warn', msg); // TODO: fire external event that clients to subscribe to
         }
     }
-
-    return r;
 }
 
 function parseLayers(layers, styles) {
+    layer_cache = {}; // clear layer cache
     var layer_trees = {};
 
     for (var key in layers) {
         var layer = layers[key];
         if (layer) {
-            layer_trees[key] = parseLayerTree(key, layer, null, styles);
+            layer_trees[key] = parseLayerNode(key, layer, null, styles);
         }
     }
 
@@ -35492,7 +35527,7 @@ function matchFeature(context, layers, collected_layers, collected_layers_ids) {
     return matched;
 }
 
-},{"../utils/log":261,"../utils/merge":263,"../utils/utils":269,"./filter":238,"./style_parser":247}],240:[function(_dereq_,module,exports){
+},{"../utils/log":259,"../utils/merge":261,"../utils/utils":267,"./filter":236,"./style_parser":245}],238:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -35543,7 +35578,7 @@ function renderDashArray(pattern) {
     return { pixels: pixels, length: length };
 }
 
-},{}],241:[function(_dereq_,module,exports){
+},{}],239:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -35896,7 +35931,7 @@ Object.assign(Lines, {
     }
 });
 
-},{"../../builders/polylines":201,"../../geo":203,"../../gl/constants":204,"../../gl/texture":210,"../../gl/vertex_layout":215,"../polygons/polygons":243,"../style":245,"../style_parser":247,"./dasharray":240}],242:[function(_dereq_,module,exports){
+},{"../../builders/polylines":199,"../../geo":201,"../../gl/constants":202,"../../gl/texture":208,"../../gl/vertex_layout":213,"../polygons/polygons":241,"../style":243,"../style_parser":245,"./dasharray":238}],240:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -36697,7 +36732,7 @@ Object.assign(Points, {
     }
 });
 
-},{"../../builders/points":199,"../../geo":203,"../../gl/constants":204,"../../gl/texture":210,"../../gl/vertex_layout":215,"../../labels/collision":216,"../../labels/label_point":220,"../../labels/point_placement":222,"../../utils/debug_settings":257,"../../utils/log":261,"../../vector":272,"../../view":273,"../style":245,"../style_parser":247,"../text/text_labels":251}],243:[function(_dereq_,module,exports){
+},{"../../builders/points":197,"../../geo":201,"../../gl/constants":202,"../../gl/texture":208,"../../gl/vertex_layout":213,"../../labels/collision":214,"../../labels/label_point":218,"../../labels/point_placement":220,"../../utils/debug_settings":255,"../../utils/log":259,"../../vector":270,"../../view":271,"../style":243,"../style_parser":245,"../text/text_labels":249}],241:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -36878,7 +36913,7 @@ Object.assign(Polygons, {
     }
 });
 
-},{"../../builders/polygons":200,"../../geo":203,"../../gl/constants":204,"../../gl/vertex_layout":215,"../style":245,"../style_parser":247}],244:[function(_dereq_,module,exports){
+},{"../../builders/polygons":198,"../../geo":201,"../../gl/constants":202,"../../gl/vertex_layout":213,"../style":243,"../style_parser":245}],242:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -36914,7 +36949,7 @@ Object.assign(RasterStyle, {
     }
 });
 
-},{"../polygons/polygons":243,"../style_parser":247}],245:[function(_dereq_,module,exports){
+},{"../polygons/polygons":241,"../style_parser":245}],243:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -37162,7 +37197,13 @@ var Style = exports.Style = {
             // Calculate order
             style.order = this.parseOrder(draw.order, context);
             if (style.order == null && this.blend !== 'overlay') {
-                (0, _log2.default)({ level: 'warn', once: true }, 'Layer \'' + draw.layers[draw.layers.length - 1] + '\': \'order\' parameter is required unless blend mode is \'overlay\'');
+                var msg = 'Layer \'' + draw.layers.join(', ') + '\', draw group \'' + draw.group + '\': ';
+                msg += '\'order\' parameter is required unless blend mode is \'overlay\'';
+                if (draw.order != null) {
+                    msg += '; \'order\' was set to a dynamic value (e.g. string tied to feature property, ';
+                    msg += 'or JS function), but evaluated to null for one or more features';
+                }
+                (0, _log2.default)({ level: 'warn', once: true }, msg);
                 return;
             }
 
@@ -37604,7 +37645,7 @@ var Style = exports.Style = {
     }
 };
 
-},{"../gl/shader_program":209,"../gl/texture":210,"../gl/vbo_mesh":212,"../light":225,"../material":226,"../selection":232,"../sources/raster":236,"../utils/log":261,"../utils/merge":263,"../utils/thread":267,"../utils/worker_broker":271,"./style_parser":247}],246:[function(_dereq_,module,exports){
+},{"../gl/shader_program":207,"../gl/texture":208,"../gl/vbo_mesh":210,"../light":223,"../material":224,"../selection":230,"../sources/raster":234,"../utils/log":259,"../utils/merge":261,"../utils/thread":265,"../utils/worker_broker":269,"./style_parser":245}],244:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -38122,7 +38163,7 @@ var StyleManager = exports.StyleManager = function () {
     return StyleManager;
 }();
 
-},{"../geo":203,"../gl/shader_program":209,"../utils/log":261,"../utils/merge":263,"./lines/lines":241,"./points/points":242,"./polygons/polygons":243,"./raster/raster":244,"./text/text":250}],247:[function(_dereq_,module,exports){
+},{"../geo":201,"../gl/shader_program":207,"../utils/log":259,"../utils/merge":261,"./lines/lines":239,"./points/points":240,"./polygons/polygons":241,"./raster/raster":242,"./text/text":248}],245:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -38536,7 +38577,7 @@ StyleParser.evalProperty = function (prop, context) {
     return prop;
 };
 
-},{"../geo":203,"../utils/utils":269,"csscolorparser":76}],248:[function(_dereq_,module,exports){
+},{"../geo":201,"../utils/utils":267,"csscolorparser":71}],246:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -38547,6 +38588,10 @@ var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = [
 
 var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
 
+var _log = _dereq_('../../utils/log');
+
+var _log2 = _interopRequireDefault(_log);
+
 var _utils = _dereq_('../../utils/utils');
 
 var _utils2 = _interopRequireDefault(_utils);
@@ -38621,7 +38666,7 @@ var CanvasText = function () {
             var dpr = void 0;
             return _font_manager2.default.loadFonts().then(function () {
                 for (var style in texts) {
-                    CanvasText.text_cache[style] = CanvasText.text_cache[style] || {};
+                    CanvasText.initTextCache(style);
 
                     var text_infos = texts[style];
                     var first = true;
@@ -38676,35 +38721,18 @@ var CanvasText = function () {
                             text_info.segments = segments;
                             text_info.size = [];
 
-                            for (var _i = 0; _i < segments.length; _i++) {
-                                var segment = segments[_i];
-                                if (!CanvasText.text_cache[style][segment]) {
-                                    CanvasText.text_cache[style][segment] = _this.textSize(segment, text_settings);
-                                    CanvasText.cache_stats.misses++;
-                                } else {
-                                    CanvasText.cache_stats.hits++;
+                            if (!text_info.no_curving) {
+                                for (var _i = 0; _i < segments.length; _i++) {
+                                    text_info.size.push(_this.textSize(style, segments[_i], text_settings).size);
                                 }
-                                text_info.size.push(CanvasText.text_cache[style][segment].size);
                             }
 
                             // add full text as well
-                            if (!CanvasText.text_cache[style][text]) {
-                                CanvasText.text_cache[style][text] = _this.textSize(text, text_settings);
-                                CanvasText.cache_stats.misses++;
-                            } else {
-                                CanvasText.cache_stats.hits++;
-                            }
-                            text_info.total_size = CanvasText.text_cache[style][text].size;
+                            text_info.total_size = _this.textSize(style, text, text_settings).size;
                         } else {
-                            if (!CanvasText.text_cache[style][text]) {
-                                CanvasText.text_cache[style][text] = _this.textSize(text, text_settings);
-                                CanvasText.cache_stats.misses++;
-                            } else {
-                                CanvasText.cache_stats.hits++;
-                            }
                             // Only send text sizes back to worker (keep computed text line info
                             // on main thread, for future rendering)
-                            text_info.size = CanvasText.text_cache[style][text].size;
+                            text_info.size = _this.textSize(style, text, text_settings).size;
                         }
                     }
                 }
@@ -38718,7 +38746,7 @@ var CanvasText = function () {
 
     }, {
         key: 'textSize',
-        value: function textSize(text, _ref2) {
+        value: function textSize(style, text, _ref2) {
             var transform = _ref2.transform,
                 text_wrap = _ref2.text_wrap,
                 max_lines = _ref2.max_lines,
@@ -38726,6 +38754,15 @@ var CanvasText = function () {
                 stroke_width = _ref2$stroke_width === undefined ? 0 : _ref2$stroke_width,
                 supersample = _ref2.supersample;
 
+            // Check cache first
+            if (CanvasText.text_cache[style][text]) {
+                CanvasText.cache_stats.hits++;
+                return CanvasText.text_cache[style][text];
+            }
+            CanvasText.cache_stats.misses++;
+            CanvasText.text_cache_count++;
+
+            // Calc and store in cache
             var dpr = _utils2.default.device_pixel_ratio * supersample;
             var str = this.applyTextTransform(text, transform);
             var ctx = this.context;
@@ -38749,10 +38786,11 @@ var CanvasText = function () {
             var logical_size = [texture_size[0] / dpr, texture_size[1] / dpr];
 
             // Returns lines (w/per-line info for drawing) and text's overall bounding box + canvas size
-            return {
+            CanvasText.text_cache[style][text] = {
                 lines: lines,
                 size: { collision_size: collision_size, texture_size: texture_size, logical_size: logical_size, line_height: line_height }
             };
+            return CanvasText.text_cache[style][text];
         }
 
         // Draw multiple lines of text
@@ -38962,6 +39000,7 @@ var CanvasText = function () {
                     }
                 }
             }
+            CanvasText.clearTexcoordCache(tile_key);
         }
 
         // Place text labels within an atlas of the given max size
@@ -38969,9 +39008,8 @@ var CanvasText = function () {
     }, {
         key: 'setTextureTextPositions',
         value: function setTextureTextPositions(texts, max_texture_size, tile_key) {
-            if (!CanvasText.texcoord_cache[tile_key]) {
-                CanvasText.texcoord_cache[tile_key] = {};
-            }
+            CanvasText.clearTexcoordCache(tile_key);
+            CanvasText.texcoord_cache[tile_key] = {};
 
             // Keep track of column width
             var column_width = 0;
@@ -39106,11 +39144,6 @@ var CanvasText = function () {
         // Convert font CSS-style size ('12px', '14pt', '1.5em', etc.) to pixel size (adjusted for device pixel ratio)
         // Defaults units to pixels if not specified
 
-    }, {
-        key: 'clearTexcoordCache',
-        value: function clearTexcoordCache(tile_key) {
-            CanvasText.texcoord_cache[tile_key] = {};
-        }
     }], [{
         key: 'fontPixelSize',
         value: function fontPixelSize(size) {
@@ -39138,6 +39171,25 @@ var CanvasText = function () {
             px_size *= _utils2.default.device_pixel_ratio;
             return px_size;
         }
+    }, {
+        key: 'clearTexcoordCache',
+        value: function clearTexcoordCache(tile_key) {
+            delete CanvasText.texcoord_cache[tile_key];
+        }
+    }, {
+        key: 'initTextCache',
+        value: function initTextCache(style) {
+            CanvasText.text_cache[style] = CanvasText.text_cache[style] || {};
+        }
+    }, {
+        key: 'pruneTextCache',
+        value: function pruneTextCache() {
+            if (CanvasText.text_cache_count > CanvasText.text_cache_count_max) {
+                CanvasText.text_cache = {};
+                CanvasText.text_cache_count = 0;
+                (0, _log2.default)('debug', 'CanvasText: pruning text cache');
+            }
+        }
     }]);
 
     return CanvasText;
@@ -39151,6 +39203,8 @@ CanvasText.font_size_re = /((?:[0-9]*\.)?[0-9]+)\s*(px|pt|em|%)?/;
 
 // Cache sizes of rendered text
 CanvasText.text_cache = {}; // by text style, then text string
+CanvasText.text_cache_count = 0; // current size of cache (measured as # of entries)
+CanvasText.text_cache_count_max = 5000; // prune cache when it exceeds this size
 CanvasText.cache_stats = { hits: 0, misses: 0 };
 CanvasText.texcoord_cache = {};
 
@@ -39235,9 +39289,6 @@ var MultiLine = function () {
         this.height = 0;
         this.lines = [];
 
-        this.ellipsis = '...';
-        this.ellipsis_width = Math.ceil(context.measureText(this.ellipsis).width);
-
         this.max_lines = max_lines;
         this.text_wrap = text_wrap;
         this.context = context;
@@ -39290,9 +39341,10 @@ var MultiLine = function () {
         key: 'addEllipsis',
         value: function addEllipsis() {
             var last_line = this.lines[this.lines.length - 1];
+            var ellipsis_width = Math.ceil(this.context.measureText(MultiLine.ellipsis).width);
 
-            last_line.append(this.ellipsis);
-            last_line.width += this.ellipsis_width;
+            last_line.append(MultiLine.ellipsis);
+            last_line.width += ellipsis_width;
 
             if (last_line.width > this.width) {
                 this.width = last_line.width;
@@ -39374,10 +39426,11 @@ var MultiLine = function () {
     return MultiLine;
 }();
 
+MultiLine.ellipsis = '...';
+
 // A Private class used by MultiLine to contain the logic for a single line
 // including character count, width, height and text
 
-
 var Line = function () {
     function Line() {
         var height = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
@@ -39408,7 +39461,7 @@ var Line = function () {
     return Line;
 }();
 
-},{"../../gl/texture":210,"../../utils/debug_settings":257,"../../utils/utils":269,"./font_manager":249}],249:[function(_dereq_,module,exports){
+},{"../../gl/texture":208,"../../utils/debug_settings":255,"../../utils/log":259,"../../utils/utils":267,"./font_manager":247}],247:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -39581,7 +39634,7 @@ var FontManager = {
 
 exports.default = FontManager;
 
-},{"../../utils/log":261,"../../utils/utils":269,"fontfaceobserver":78}],250:[function(_dereq_,module,exports){
+},{"../../utils/log":259,"../../utils/utils":267,"fontfaceobserver":74}],248:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -39889,7 +39942,7 @@ Object.assign(TextStyle, {
 
 TextStyle.texture_id = 0; // namespaces per-tile label textures
 
-},{"../../geo":203,"../../gl/constants":204,"../../labels/collision":216,"../../labels/label_line":219,"../../labels/label_point":220,"../points/points":242,"../style":245}],251:[function(_dereq_,module,exports){
+},{"../../geo":201,"../../gl/constants":202,"../../labels/collision":214,"../../labels/label_line":217,"../../labels/label_point":218,"../points/points":240,"../style":243}],249:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -40176,7 +40229,6 @@ var TextLabels = exports.TextLabels = {
     // Called on main thread from worker, to create atlas of labels for a tile
     rasterizeTexts: function rasterizeTexts(tile_key, texts) {
         var canvas = new _canvas_text2.default();
-        canvas.clearTexcoordCache(tile_key);
 
         var texture_size = canvas.setTextureTextPositions(texts, this.max_texture_size, tile_key);
         (0, _log2.default)('trace', 'text summary for tile ' + tile_key + ': fits in ' + texture_size[0] + 'x' + texture_size[1] + 'px');
@@ -40276,7 +40328,7 @@ var TextLabels = exports.TextLabels = {
     }
 };
 
-},{"../../geo":203,"../../gl/texture":210,"../../labels/collision":216,"../../utils/log":261,"../../utils/thread":267,"../../utils/worker_broker":271,"../style_parser":247,"../text/canvas_text":248,"../text/text_settings":252}],252:[function(_dereq_,module,exports){
+},{"../../geo":201,"../../gl/texture":208,"../../labels/collision":214,"../../utils/log":259,"../../utils/thread":265,"../../utils/worker_broker":269,"../style_parser":245,"../text/canvas_text":246,"../text/text_settings":250}],250:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -40401,7 +40453,7 @@ exports.default = TextSettings = {
     }
 };
 
-},{"../../geo":203,"../../utils/utils":269,"../style_parser":247}],253:[function(_dereq_,module,exports){
+},{"../../geo":201,"../../utils/utils":267,"../style_parser":245}],251:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -41148,7 +41200,7 @@ exports.default = Tile;
 
 Tile.coord_children = {}; // only allocate children coordinates once per coordinate
 
-},{"./geo":203,"./gl/texture":210,"./labels/collision":216,"./styles/style_parser":247,"./utils/gl-matrix":259,"./utils/log":261,"./utils/merge":263,"./utils/utils":269,"./utils/worker_broker":271}],254:[function(_dereq_,module,exports){
+},{"./geo":201,"./gl/texture":208,"./labels/collision":214,"./styles/style_parser":245,"./utils/gl-matrix":257,"./utils/log":259,"./utils/merge":261,"./utils/utils":267,"./utils/worker_broker":269}],252:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -41630,7 +41682,7 @@ var TileManager = function () {
 
 exports.default = TileManager;
 
-},{"./tile":253,"./tile_pyramid":255,"./utils/log":261,"./utils/worker_broker":271}],255:[function(_dereq_,module,exports){
+},{"./tile":251,"./tile_pyramid":253,"./utils/log":259,"./utils/worker_broker":269}],253:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -41821,7 +41873,7 @@ var TilePyramid = function () {
 
 exports.default = TilePyramid;
 
-},{"./geo":203,"./tile":253}],256:[function(_dereq_,module,exports){
+},{"./geo":201,"./tile":251}],254:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -41844,7 +41896,7 @@ function debounce(func, wait) {
     };
 }
 
-},{}],257:[function(_dereq_,module,exports){
+},{}],255:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -41861,7 +41913,7 @@ exports.default = {
     suppress_label_snap_animation: false
 };
 
-},{}],258:[function(_dereq_,module,exports){
+},{}],256:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -41890,7 +41942,7 @@ var MethodNotImplemented = exports.MethodNotImplemented = function (_Error) {
     return MethodNotImplemented;
 }(Error);
 
-},{}],259:[function(_dereq_,module,exports){
+},{}],257:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -41977,7 +42029,7 @@ exports.vec3 = vec3;
 exports.mat3 = mat3;
 exports.mat4 = mat4;
 
-},{"gl-mat3/invert":87,"gl-mat3/normal-from-mat4":88,"gl-mat4/copy":89,"gl-mat4/identity":90,"gl-mat4/lookAt":91,"gl-mat4/multiply":92,"gl-mat4/perspective":93,"gl-mat4/scale":94,"gl-mat4/translate":95}],260:[function(_dereq_,module,exports){
+},{"gl-mat3/invert":83,"gl-mat3/normal-from-mat4":84,"gl-mat4/copy":85,"gl-mat4/identity":86,"gl-mat4/lookAt":87,"gl-mat4/multiply":88,"gl-mat4/perspective":89,"gl-mat4/scale":90,"gl-mat4/translate":91}],258:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -42003,7 +42055,7 @@ function hashString(string) {
     return hash;
 }
 
-},{}],261:[function(_dereq_,module,exports){
+},{}],259:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -42103,7 +42155,7 @@ if (_thread2.default.is_main) {
 _worker_broker2.default.addTarget('_logProxy', log); // proxy log messages from worker to main thread
 _worker_broker2.default.addTarget('_logSetLevelProxy', log.setLevel); // proxy log level setting from main to worker thread
 
-},{"./thread":267,"./version":270,"./worker_broker":271}],262:[function(_dereq_,module,exports){
+},{"./thread":265,"./version":268,"./worker_broker":269}],260:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -42266,7 +42318,7 @@ var MediaCapture = function () {
 
 exports.default = MediaCapture;
 
-},{"./log":261,"./urls":268}],263:[function(_dereq_,module,exports){
+},{"./log":259,"./urls":266}],261:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -42310,7 +42362,7 @@ function mergeObjects(dest) {
     return dest;
 }
 
-},{}],264:[function(_dereq_,module,exports){
+},{}],262:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -42427,7 +42479,7 @@ var OBB = function () {
 
 exports.default = OBB;
 
-},{"../vector":272}],265:[function(_dereq_,module,exports){
+},{"../vector":270}],263:[function(_dereq_,module,exports){
 'use strict';
 
 _dereq_('core-js/es6/promise');
@@ -42476,7 +42528,7 @@ Math.hypot = Math.hypot || function () {
     return Math.sqrt(y);
 };
 
-},{"core-js/es6/promise":12}],266:[function(_dereq_,module,exports){
+},{"core-js/es6/promise":6}],264:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -42536,7 +42588,7 @@ function subscribeMixin(target) {
     });
 }
 
-},{"./log":261}],267:[function(_dereq_,module,exports){
+},{"./log":259}],265:[function(_dereq_,module,exports){
 "use strict";
 
 Object.defineProperty(exports, "__esModule", {
@@ -42568,7 +42620,7 @@ try {
     }
 }
 
-},{}],268:[function(_dereq_,module,exports){
+},{}],266:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -42788,7 +42840,7 @@ function getURLParameter(name, url) {
     return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
 }
 
-},{"./log":261}],269:[function(_dereq_,module,exports){
+},{"./log":259}],267:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -43102,18 +43154,18 @@ Utils.pointInTile = function (point) {
     return point[0] >= 0 && point[1] > -_geo2.default.tile_scale && point[0] < _geo2.default.tile_scale && point[1] <= 0;
 };
 
-},{"../geo":203,"./log":261,"./thread":267,"./worker_broker":271}],270:[function(_dereq_,module,exports){
+},{"../geo":201,"./log":259,"./thread":265,"./worker_broker":269}],268:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
 
-var pkg = JSON.parse("{\n  \"name\": \"tangram\",\n  \"version\": \"0.12.0\",\n  \"description\": \"WebGL Maps for Vector Tiles\",\n  \"repository\": {\n    \"type\": \"git\",\n    \"url\": \"git://github.com/tangrams/tangram.git\"\n  },\n  \"main\": \"dist/tangram.min.js\",\n  \"homepage\": \"https://github.com/tangrams/tangram\",\n  \"keywords\": [\n    \"maps\",\n    \"graphics\",\n    \"rendering\",\n    \"visualization\",\n    \"WebGL\",\n    \"OpenStreetMap\"\n  ],\n  \"config\": {\n    \"output\": \"\",\n    \"output_map\": \"\"\n  },\n  \"scripts\": {\n    \"start\": \"npm run watch\",\n    \"test\": \"npm run lint && npm run build-bundle && npm run test-local\",\n    \"test-ci\": \"npm run lint && npm run build-bundle && npm run test-remote\",\n    \"test-remote\": \"./node_modules/karma/bin/karma start --browsers SL_Firefox --single-run\",\n    \"test-local\": \"./node_modules/karma/bin/karma start --browsers Chrome --single-run\",\n    \"karma-start\": \"./node_modules/karma/bin/karma start --browsers Chrome --no-watch\",\n    \"karma-run\": \"./node_modules/karma/bin/karma run --browsers Chrome\",\n    \"lint\": \"$(npm bin)/jshint src/ && jshint test/\",\n    \"build\": \"npm run build-bundle && npm run build-minify\",\n    \"build-bundle\": \"$(npm bin)/browserify src/module.js -t [ babelify --presets [ es2015 ] ] -t brfs --debug -s Tangram -p browserify-derequire -p './build/quine.js' -p [ mapstraction 'dist/tangram.debug.js.map' ] -o dist/tangram.debug.js\",\n    \"build-minify\": \"$(npm bin)/uglifyjs dist/tangram.debug.js -c warnings=false -m -o dist/tangram.min.js && npm run build-size\",\n    \"build-size\": \"gzip dist/tangram.min.js -c | wc -c | awk '{kb=$1/1024; print kb}' OFMT='%.0fk minified+gzipped'\",\n    \"watch\": \"$(npm bin)/budo src/module.js:dist/tangram.debug.js --port 8000 --cors --live -- -t [ babelify --presets [ es2015 ] ] -t brfs -s Tangram -p './build/quine.js' -p [ mapstraction 'dist/tangram.debug.js.map' ]\"\n  },\n  \"author\": {\n    \"name\": \"Mapzen\",\n    \"email\": \"tangram@mapzen.com\"\n  },\n  \"contributors\": [\n    {\n      \"name\": \"Brett Camper\"\n    },\n    {\n      \"name\": \"Peter Richardson\"\n    },\n    {\n      \"name\": \"Patricio Gonzalez Vivo\"\n    },\n    {\n      \"name\": \"Karim Naaji\"\n    },\n    {\n      \"name\": \"Ivan Willig\"\n    },\n    {\n      \"name\": \"Lou Huang\"\n    },\n    {\n      \"name\": \"David Valdman\"\n    }\n  ],\n  \"license\": \"MIT\",\n  \"dependencies\": {\n    \"brfs\": \"1.4.3\",\n    \"csscolorparser\": \"1.0.3\",\n    \"earcut\": \"2.1.1\",\n    \"fontfaceobserver\": \"2.0.7\",\n    \"geojson-vt\": \"2.4.0\",\n    \"gl-mat3\": \"1.0.0\",\n    \"gl-mat4\": \"1.1.4\",\n    \"gl-shader-errors\": \"1.0.3\",\n    \"js-yaml\": \"tangrams/js-yaml#read-only\",\n    \"jszip\": \"tangrams/jszip#read-only\",\n    \"pbf\": \"1.3.7\",\n    \"strip-comments\": \"0.3.2\",\n    \"topojson-client\": \"tangrams/topojson-client#read-only\",\n    \"vector-tile\": \"1.3.0\"\n  },\n  \"devDependencies\": {\n    \"babelify\": \"7.3.0\",\n    \"babel-preset-es2015\": \"6.16.0\",\n    \"browserify\": \"13.0.1\",\n    \"browserify-derequire\": \"0.9.4\",\n    \"budo\": \"8.2.1\",\n    \"chai\": \"1.9.2\",\n    \"chai-as-promised\": \"4.1.1\",\n    \"core-js\": \"2.4.1\",\n    \"glob\": \"4.0.6\",\n    \"jshint\": \"jshint/jshint#3a8efa979dbb157bfb5c10b5826603a55a33b9ad\",\n    \"karma\": \"0.12.23\",\n    \"karma-browserify\": \"5.1.0\",\n    \"karma-chrome-launcher\": \"0.1.4\",\n    \"karma-mocha\": \"0.1.9\",\n    \"karma-mocha-reporter\": \"1.0.0\",\n    \"karma-sauce-launcher\": \"tangrams/karma-sauce-launcher#firefox-profiles\",\n    \"karma-sinon\": \"1.0.4\",\n    \"mapstraction\": \"1.0.1\",\n    \"mocha\": \"1.21.4\",\n    \"sinon\": \"1.10.3\",\n    \"through2\": \"2.0.3\",\n    \"uglify-js\": \"2.4.14\",\n    \"yargs\": \"1.3.2\"\n  }\n}\n");
+var pkg = JSON.parse("{\n  \"name\": \"tangram\",\n  \"version\": \"0.12.1\",\n  \"description\": \"WebGL Maps for Vector Tiles\",\n  \"repository\": {\n    \"type\": \"git\",\n    \"url\": \"git://github.com/tangrams/tangram.git\"\n  },\n  \"main\": \"dist/tangram.min.js\",\n  \"homepage\": \"https://github.com/tangrams/tangram\",\n  \"keywords\": [\n    \"maps\",\n    \"graphics\",\n    \"rendering\",\n    \"visualization\",\n    \"WebGL\",\n    \"OpenStreetMap\"\n  ],\n  \"config\": {\n    \"output\": \"\",\n    \"output_map\": \"\"\n  },\n  \"scripts\": {\n    \"start\": \"npm run watch\",\n    \"test\": \"npm run lint && npm run build-bundle && npm run test-local\",\n    \"test-ci\": \"npm run lint && npm run build-bundle && npm run test-remote\",\n    \"test-remote\": \"./node_modules/karma/bin/karma start --browsers SL_Firefox --single-run\",\n    \"test-local\": \"./node_modules/karma/bin/karma start --browsers Chrome --single-run\",\n    \"karma-start\": \"./node_modules/karma/bin/karma start --browsers Chrome --no-watch\",\n    \"karma-run\": \"./node_modules/karma/bin/karma run --browsers Chrome\",\n    \"lint\": \"$(npm bin)/jshint src/ && jshint test/\",\n    \"build\": \"npm run build-bundle && npm run build-minify\",\n    \"build-bundle\": \"$(npm bin)/browserify src/module.js -t [ babelify --presets [ es2015 ] ] -t brfs --debug -s Tangram -p browserify-derequire -p [ './build/quine.js' 'tangram.debug.js.map' ] -p [ mapstraction 'dist/tangram.debug.js.map' ] -o dist/tangram.debug.js\",\n    \"build-minify\": \"$(npm bin)/uglifyjs dist/tangram.debug.js -c warnings=false -m -o dist/tangram.min.js && npm run build-size\",\n    \"build-size\": \"gzip dist/tangram.min.js -c | wc -c | awk '{kb=$1/1024; print kb}' OFMT='%.0fk minified+gzipped'\",\n    \"watch\": \"$(npm bin)/budo src/module.js:dist/tangram.debug.js --port 8000 --cors --live -- -t [ babelify --presets [ es2015 ] ] -t brfs -s Tangram -p [ './build/quine.js' 'tangram.debug.temp.js.map' ] -p [ mapstraction 'dist/tangram.debug.temp.js.map' ]\"\n  },\n  \"author\": {\n    \"name\": \"Mapzen\",\n    \"email\": \"tangram@mapzen.com\"\n  },\n  \"contributors\": [\n    {\n      \"name\": \"Brett Camper\"\n    },\n    {\n      \"name\": \"Peter Richardson\"\n    },\n    {\n      \"name\": \"Patricio Gonzalez Vivo\"\n    },\n    {\n      \"name\": \"Karim Naaji\"\n    },\n    {\n      \"name\": \"Ivan Willig\"\n    },\n    {\n      \"name\": \"Lou Huang\"\n    },\n    {\n      \"name\": \"David Valdman\"\n    }\n  ],\n  \"license\": \"MIT\",\n  \"dependencies\": {\n    \"brfs\": \"1.4.3\",\n    \"csscolorparser\": \"1.0.3\",\n    \"earcut\": \"2.1.1\",\n    \"fontfaceobserver\": \"2.0.7\",\n    \"geojson-vt\": \"2.4.0\",\n    \"gl-mat3\": \"1.0.0\",\n    \"gl-mat4\": \"1.1.4\",\n    \"gl-shader-errors\": \"1.0.3\",\n    \"js-yaml\": \"tangrams/js-yaml#read-only\",\n    \"jszip\": \"tangrams/jszip#read-only\",\n    \"pbf\": \"1.3.7\",\n    \"strip-comments\": \"0.3.2\",\n    \"topojson-client\": \"tangrams/topojson-client#read-only\",\n    \"vector-tile\": \"1.3.0\"\n  },\n  \"devDependencies\": {\n    \"babelify\": \"7.3.0\",\n    \"babel-preset-es2015\": \"6.16.0\",\n    \"browserify\": \"13.0.1\",\n    \"browserify-derequire\": \"0.9.4\",\n    \"budo\": \"8.2.1\",\n    \"chai\": \"1.9.2\",\n    \"chai-as-promised\": \"4.1.1\",\n    \"core-js\": \"2.4.1\",\n    \"glob\": \"4.0.6\",\n    \"jshint\": \"jshint/jshint#3a8efa979dbb157bfb5c10b5826603a55a33b9ad\",\n    \"karma\": \"1.5.0\",\n    \"karma-browserify\": \"5.1.0\",\n    \"karma-chrome-launcher\": \"2.0.0\",\n    \"karma-mocha\": \"0.1.9\",\n    \"karma-mocha-reporter\": \"1.0.0\",\n    \"karma-sauce-launcher\": \"tangrams/karma-sauce-launcher#firefox-profiles2\",\n    \"karma-sinon\": \"1.0.4\",\n    \"mapstraction\": \"1.0.1\",\n    \"mocha\": \"1.21.4\",\n    \"sinon\": \"1.10.3\",\n    \"through2\": \"2.0.3\",\n    \"uglify-js\": \"2.4.14\",\n    \"yargs\": \"1.3.2\"\n  }\n}\n");
 var version = void 0;
 exports.default = version = 'v' + pkg.version;
 
-},{}],271:[function(_dereq_,module,exports){
+},{}],269:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -43675,7 +43727,7 @@ if (_thread2.default.is_worker) {
     setupWorkerThread();
 }
 
-},{"./log":261,"./thread":267}],272:[function(_dereq_,module,exports){
+},{"./log":259,"./thread":265}],270:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -43882,7 +43934,7 @@ Vector.dot = function (v1, v2) {
     return n;
 };
 
-},{}],273:[function(_dereq_,module,exports){
+},{}],271:[function(_dereq_,module,exports){
 'use strict';
 
 Object.defineProperty(exports, "__esModule", {
@@ -43954,6 +44006,7 @@ var View = function () {
 
         this.buffer = 0;
         this.continuous_zoom = typeof options.continuousZoom === 'boolean' ? options.continuousZoom : true;
+        this.wrap = options.wrapView === false ? false : true;
         this.tile_simplification_level = 0; // level-of-detail downsampling to apply to tile loading
         this.preserve_tiles_within_zoom = 1;
 
@@ -44057,7 +44110,7 @@ var View = function () {
             if (typeof lng === 'number' && typeof lat === 'number') {
                 if (!this.center || lng !== this.center.lng || lat !== this.center.lat) {
                     changed = true;
-                    this.center = { lng: _geo2.default.wrapLng(lng), lat: lat };
+                    this.center = { lng: lng, lat: lat };
                 }
             }
 
@@ -44202,9 +44255,21 @@ var View = function () {
             var sw = _geo2.default.tileForMeters([this.bounds.sw.x, this.bounds.sw.y], z);
             var ne = _geo2.default.tileForMeters([this.bounds.ne.x, this.bounds.ne.y], z);
 
+            var range = [sw.x - this.buffer, ne.x + this.buffer, // x
+            ne.y - this.buffer, sw.y + this.buffer // y
+            ];
+
+            if (this.wrap === false) {
+                // prevent tiles from wrapping across antimeridian
+                var tmax = (1 << z) - 1; // max xy tile number for this zoom
+                range = range.map(function (v) {
+                    return Math.min(Math.max(0, v), tmax);
+                });
+            }
+
             var coords = [];
-            for (var x = sw.x - this.buffer; x <= ne.x + this.buffer; x++) {
-                for (var y = ne.y - this.buffer; y <= sw.y + this.buffer; y++) {
+            for (var x = range[0]; x <= range[1]; x++) {
+                for (var y = range[2]; y <= range[3]; y++) {
                     coords.push(_tile2.default.coord({ x: x, y: y, z: z }));
                 }
             }
@@ -44317,6 +44382,6 @@ var View = function () {
 
 exports.default = View;
 
-},{"./camera":202,"./geo":203,"./tile":253,"./utils/log":261,"./utils/subscribe":266,"./utils/utils":269}]},{},[227])(227)
+},{"./camera":200,"./geo":201,"./tile":251,"./utils/log":259,"./utils/subscribe":264,"./utils/utils":267}]},{},[225])(225)
 });})();
 //# sourceMappingURL=tangram.debug.js.map
\ No newline at end of file
diff --git a/dist/tangram.debug.js.map b/dist/tangram.debug.js.map
index e61033ab2..bd72b4aa3 100644
--- a/dist/tangram.debug.js.map
+++ b/dist/tangram.debug.js.map
@@ -1,18 +1,12 @@
 {
   "version": 3,
   "sources": [
-    "node_modules/browserify/node_modules/browser-pack/_prelude.js",
-    "node_modules/browserify/node_modules/browser-resolve/empty.js",
-    "node_modules/browserify/node_modules/buffer/index.js",
-    "node_modules/browserify/node_modules/buffer/node_modules/base64-js/index.js",
-    "node_modules/browserify/node_modules/buffer/node_modules/ieee754/index.js",
-    "node_modules/browserify/node_modules/buffer/node_modules/isarray/index.js",
-    "node_modules/browserify/node_modules/events/events.js",
-    "node_modules/browserify/node_modules/insert-module-globals/node_modules/is-buffer/index.js",
-    "node_modules/browserify/node_modules/process/browser.js",
-    "node_modules/browserify/node_modules/util/node_modules/inherits/inherits_browser.js",
-    "node_modules/browserify/node_modules/util/support/isBufferBrowser.js",
-    "node_modules/browserify/node_modules/util/util.js",
+    "node_modules/browser-pack/_prelude.js",
+    "node_modules/asap/browser-asap.js",
+    "node_modules/asap/browser-raw.js",
+    "node_modules/base64-js/index.js",
+    "node_modules/browser-resolve/empty.js",
+    "node_modules/buffer/index.js",
     "node_modules/core-js/es6/promise.js",
     "node_modules/core-js/modules/_a-function.js",
     "node_modules/core-js/modules/_add-to-unscopables.js",
@@ -77,8 +71,10 @@
     "node_modules/core-js/modules/es6.promise.js",
     "node_modules/core-js/modules/es6.string.iterator.js",
     "node_modules/core-js/modules/web.dom.iterable.js",
+    "node_modules/core-util-is/lib/util.js",
     "node_modules/csscolorparser/csscolorparser.js",
     "node_modules/earcut/src/earcut.js",
+    "node_modules/events/events.js",
     "node_modules/fontfaceobserver/fontfaceobserver.standalone.js",
     "node_modules/geojson-vt/src/clip.js",
     "node_modules/geojson-vt/src/convert.js",
@@ -98,6 +94,10 @@
     "node_modules/gl-mat4/scale.js",
     "node_modules/gl-mat4/translate.js",
     "node_modules/gl-shader-errors/index.js",
+    "node_modules/ieee754/index.js",
+    "node_modules/inherits/inherits_browser.js",
+    "node_modules/is-buffer/index.js",
+    "node_modules/isarray/index.js",
     "node_modules/js-yaml/index.js",
     "node_modules/js-yaml/lib/js-yaml.js",
     "node_modules/js-yaml/lib/js-yaml/common.js",
@@ -159,43 +159,43 @@
     "node_modules/jszip/lib/zipEntries.js",
     "node_modules/jszip/lib/zipEntry.js",
     "node_modules/jszip/lib/zipObject.js",
-    "node_modules/jszip/node_modules/asap/browser-asap.js",
-    "node_modules/jszip/node_modules/asap/browser-raw.js",
-    "node_modules/jszip/node_modules/pako/index.js",
-    "node_modules/jszip/node_modules/pako/lib/deflate.js",
-    "node_modules/jszip/node_modules/pako/lib/inflate.js",
-    "node_modules/jszip/node_modules/pako/lib/utils/common.js",
-    "node_modules/jszip/node_modules/pako/lib/utils/strings.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/adler32.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/constants.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/crc32.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/deflate.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/gzheader.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/inffast.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/inflate.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/inftrees.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/messages.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/trees.js",
-    "node_modules/jszip/node_modules/pako/lib/zlib/zstream.js",
     "node_modules/jszip/node_modules/readable-stream/lib/_stream_duplex.js",
     "node_modules/jszip/node_modules/readable-stream/lib/_stream_passthrough.js",
     "node_modules/jszip/node_modules/readable-stream/lib/_stream_readable.js",
     "node_modules/jszip/node_modules/readable-stream/lib/_stream_transform.js",
     "node_modules/jszip/node_modules/readable-stream/lib/_stream_writable.js",
-    "node_modules/jszip/node_modules/readable-stream/node_modules/core-util-is/lib/util.js",
-    "node_modules/jszip/node_modules/readable-stream/node_modules/process-nextick-args/index.js",
-    "node_modules/jszip/node_modules/readable-stream/node_modules/string_decoder/index.js",
-    "node_modules/jszip/node_modules/readable-stream/node_modules/util-deprecate/browser.js",
     "node_modules/jszip/node_modules/readable-stream/readable.js",
+    "node_modules/pako/index.js",
+    "node_modules/pako/lib/deflate.js",
+    "node_modules/pako/lib/inflate.js",
+    "node_modules/pako/lib/utils/common.js",
+    "node_modules/pako/lib/utils/strings.js",
+    "node_modules/pako/lib/zlib/adler32.js",
+    "node_modules/pako/lib/zlib/constants.js",
+    "node_modules/pako/lib/zlib/crc32.js",
+    "node_modules/pako/lib/zlib/deflate.js",
+    "node_modules/pako/lib/zlib/gzheader.js",
+    "node_modules/pako/lib/zlib/inffast.js",
+    "node_modules/pako/lib/zlib/inflate.js",
+    "node_modules/pako/lib/zlib/inftrees.js",
+    "node_modules/pako/lib/zlib/messages.js",
+    "node_modules/pako/lib/zlib/trees.js",
+    "node_modules/pako/lib/zlib/zstream.js",
     "node_modules/pbf/buffer.js",
     "node_modules/pbf/index.js",
+    "node_modules/point-geometry/index.js",
+    "node_modules/process-nextick-args/index.js",
+    "node_modules/process/browser.js",
+    "node_modules/string_decoder/index.js",
     "node_modules/strip-comments/index.js",
     "node_modules/topojson-client/dist/topojson-client.js",
+    "node_modules/util-deprecate/browser.js",
+    "node_modules/util/support/isBufferBrowser.js",
+    "node_modules/util/util.js",
     "node_modules/vector-tile/index.js",
     "node_modules/vector-tile/lib/vectortile.js",
     "node_modules/vector-tile/lib/vectortilefeature.js",
     "node_modules/vector-tile/lib/vectortilelayer.js",
-    "node_modules/vector-tile/node_modules/point-geometry/index.js",
     "src/builders/common.js",
     "src/builders/points.js",
     "src/builders/polygons.js",
@@ -274,22 +274,16 @@
     "src/view.js"
   ],
   "names": [],
-  "mappings": 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   "sourcesContent": [
     "(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})",
+    "\"use strict\";\n\n// rawAsap provides everything we need except exception management.\nvar rawAsap = require(\"./raw\");\n// RawTasks are recycled to reduce GC churn.\nvar freeTasks = [];\n// We queue errors to ensure they are thrown in right order (FIFO).\n// Array-as-queue is good enough here, since we are just dealing with exceptions.\nvar pendingErrors = [];\nvar requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);\n\nfunction throwFirstError() {\n    if (pendingErrors.length) {\n        throw pendingErrors.shift();\n    }\n}\n\n/**\n * Calls a task as soon as possible after returning, in its own event, with priority\n * over other events like animation, reflow, and repaint. An error thrown from an\n * event will not interrupt, nor even substantially slow down the processing of\n * other events, but will be rather postponed to a lower priority event.\n * @param {{call}} task A callable object, typically a function that takes no\n * arguments.\n */\nmodule.exports = asap;\nfunction asap(task) {\n    var rawTask;\n    if (freeTasks.length) {\n        rawTask = freeTasks.pop();\n    } else {\n        rawTask = new RawTask();\n    }\n    rawTask.task = task;\n    rawAsap(rawTask);\n}\n\n// We wrap tasks with recyclable task objects.  A task object implements\n// `call`, just like a function.\nfunction RawTask() {\n    this.task = null;\n}\n\n// The sole purpose of wrapping the task is to catch the exception and recycle\n// the task object after its single use.\nRawTask.prototype.call = function () {\n    try {\n        this.task.call();\n    } catch (error) {\n        if (asap.onerror) {\n            // This hook exists purely for testing purposes.\n            // Its name will be periodically randomized to break any code that\n            // depends on its existence.\n            asap.onerror(error);\n        } else {\n            // In a web browser, exceptions are not fatal. However, to avoid\n            // slowing down the queue of pending tasks, we rethrow the error in a\n            // lower priority turn.\n            pendingErrors.push(error);\n            requestErrorThrow();\n        }\n    } finally {\n        this.task = null;\n        freeTasks[freeTasks.length] = this;\n    }\n};\n",
+    "\"use strict\";\n\n// Use the fastest means possible to execute a task in its own turn, with\n// priority over other events including IO, animation, reflow, and redraw\n// events in browsers.\n//\n// An exception thrown by a task will permanently interrupt the processing of\n// subsequent tasks. The higher level `asap` function ensures that if an\n// exception is thrown by a task, that the task queue will continue flushing as\n// soon as possible, but if you use `rawAsap` directly, you are responsible to\n// either ensure that no exceptions are thrown from your task, or to manually\n// call `rawAsap.requestFlush` if an exception is thrown.\nmodule.exports = rawAsap;\nfunction rawAsap(task) {\n    if (!queue.length) {\n        requestFlush();\n        flushing = true;\n    }\n    // Equivalent to push, but avoids a function call.\n    queue[queue.length] = task;\n}\n\nvar queue = [];\n// Once a flush has been requested, no further calls to `requestFlush` are\n// necessary until the next `flush` completes.\nvar flushing = false;\n// `requestFlush` is an implementation-specific method that attempts to kick\n// off a `flush` event as quickly as possible. `flush` will attempt to exhaust\n// the event queue before yielding to the browser's own event loop.\nvar requestFlush;\n// The position of the next task to execute in the task queue. This is\n// preserved between calls to `flush` so that it can be resumed if\n// a task throws an exception.\nvar index = 0;\n// If a task schedules additional tasks recursively, the task queue can grow\n// unbounded. To prevent memory exhaustion, the task queue will periodically\n// truncate already-completed tasks.\nvar capacity = 1024;\n\n// The flush function processes all tasks that have been scheduled with\n// `rawAsap` unless and until one of those tasks throws an exception.\n// If a task throws an exception, `flush` ensures that its state will remain\n// consistent and will resume where it left off when called again.\n// However, `flush` does not make any arrangements to be called again if an\n// exception is thrown.\nfunction flush() {\n    while (index < queue.length) {\n        var currentIndex = index;\n        // Advance the index before calling the task. This ensures that we will\n        // begin flushing on the next task the task throws an error.\n        index = index + 1;\n        queue[currentIndex].call();\n        // Prevent leaking memory for long chains of recursive calls to `asap`.\n        // If we call `asap` within tasks scheduled by `asap`, the queue will\n        // grow, but to avoid an O(n) walk for every task we execute, we don't\n        // shift tasks off the queue after they have been executed.\n        // Instead, we periodically shift 1024 tasks off the queue.\n        if (index > capacity) {\n            // Manually shift all values starting at the index back to the\n            // beginning of the queue.\n            for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {\n                queue[scan] = queue[scan + index];\n            }\n            queue.length -= index;\n            index = 0;\n        }\n    }\n    queue.length = 0;\n    index = 0;\n    flushing = false;\n}\n\n// `requestFlush` is implemented using a strategy based on data collected from\n// every available SauceLabs Selenium web driver worker at time of writing.\n// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593\n\n// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that\n// have WebKitMutationObserver but not un-prefixed MutationObserver.\n// Must use `global` or `self` instead of `window` to work in both frames and web\n// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.\n\n/* globals self */\nvar scope = typeof global !== \"undefined\" ? global : self;\nvar BrowserMutationObserver = scope.MutationObserver || scope.WebKitMutationObserver;\n\n// MutationObservers are desirable because they have high priority and work\n// reliably everywhere they are implemented.\n// They are implemented in all modern browsers.\n//\n// - Android 4-4.3\n// - Chrome 26-34\n// - Firefox 14-29\n// - Internet Explorer 11\n// - iPad Safari 6-7.1\n// - iPhone Safari 7-7.1\n// - Safari 6-7\nif (typeof BrowserMutationObserver === \"function\") {\n    requestFlush = makeRequestCallFromMutationObserver(flush);\n\n// MessageChannels are desirable because they give direct access to the HTML\n// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera\n// 11-12, and in web workers in many engines.\n// Although message channels yield to any queued rendering and IO tasks, they\n// would be better than imposing the 4ms delay of timers.\n// However, they do not work reliably in Internet Explorer or Safari.\n\n// Internet Explorer 10 is the only browser that has setImmediate but does\n// not have MutationObservers.\n// Although setImmediate yields to the browser's renderer, it would be\n// preferrable to falling back to setTimeout since it does not have\n// the minimum 4ms penalty.\n// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and\n// Desktop to a lesser extent) that renders both setImmediate and\n// MessageChannel useless for the purposes of ASAP.\n// https://github.com/kriskowal/q/issues/396\n\n// Timers are implemented universally.\n// We fall back to timers in workers in most engines, and in foreground\n// contexts in the following browsers.\n// However, note that even this simple case requires nuances to operate in a\n// broad spectrum of browsers.\n//\n// - Firefox 3-13\n// - Internet Explorer 6-9\n// - iPad Safari 4.3\n// - Lynx 2.8.7\n} else {\n    requestFlush = makeRequestCallFromTimer(flush);\n}\n\n// `requestFlush` requests that the high priority event queue be flushed as\n// soon as possible.\n// This is useful to prevent an error thrown in a task from stalling the event\n// queue if the exception handled by Node.js’s\n// `process.on(\"uncaughtException\")` or by a domain.\nrawAsap.requestFlush = requestFlush;\n\n// To request a high priority event, we induce a mutation observer by toggling\n// the text of a text node between \"1\" and \"-1\".\nfunction makeRequestCallFromMutationObserver(callback) {\n    var toggle = 1;\n    var observer = new BrowserMutationObserver(callback);\n    var node = document.createTextNode(\"\");\n    observer.observe(node, {characterData: true});\n    return function requestCall() {\n        toggle = -toggle;\n        node.data = toggle;\n    };\n}\n\n// The message channel technique was discovered by Malte Ubl and was the\n// original foundation for this library.\n// http://www.nonblocking.io/2011/06/windownexttick.html\n\n// Safari 6.0.5 (at least) intermittently fails to create message ports on a\n// page's first load. Thankfully, this version of Safari supports\n// MutationObservers, so we don't need to fall back in that case.\n\n// function makeRequestCallFromMessageChannel(callback) {\n//     var channel = new MessageChannel();\n//     channel.port1.onmessage = callback;\n//     return function requestCall() {\n//         channel.port2.postMessage(0);\n//     };\n// }\n\n// For reasons explained above, we are also unable to use `setImmediate`\n// under any circumstances.\n// Even if we were, there is another bug in Internet Explorer 10.\n// It is not sufficient to assign `setImmediate` to `requestFlush` because\n// `setImmediate` must be called *by name* and therefore must be wrapped in a\n// closure.\n// Never forget.\n\n// function makeRequestCallFromSetImmediate(callback) {\n//     return function requestCall() {\n//         setImmediate(callback);\n//     };\n// }\n\n// Safari 6.0 has a problem where timers will get lost while the user is\n// scrolling. This problem does not impact ASAP because Safari 6.0 supports\n// mutation observers, so that implementation is used instead.\n// However, if we ever elect to use timers in Safari, the prevalent work-around\n// is to add a scroll event listener that calls for a flush.\n\n// `setTimeout` does not call the passed callback if the delay is less than\n// approximately 7 in web workers in Firefox 8 through 18, and sometimes not\n// even then.\n\nfunction makeRequestCallFromTimer(callback) {\n    return function requestCall() {\n        // We dispatch a timeout with a specified delay of 0 for engines that\n        // can reliably accommodate that request. This will usually be snapped\n        // to a 4 milisecond delay, but once we're flushing, there's no delay\n        // between events.\n        var timeoutHandle = setTimeout(handleTimer, 0);\n        // However, since this timer gets frequently dropped in Firefox\n        // workers, we enlist an interval handle that will try to fire\n        // an event 20 times per second until it succeeds.\n        var intervalHandle = setInterval(handleTimer, 50);\n\n        function handleTimer() {\n            // Whichever timer succeeds will cancel both timers and\n            // execute the callback.\n            clearTimeout(timeoutHandle);\n            clearInterval(intervalHandle);\n            callback();\n        }\n    };\n}\n\n// This is for `asap.js` only.\n// Its name will be periodically randomized to break any code that depends on\n// its existence.\nrawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;\n\n// ASAP was originally a nextTick shim included in Q. This was factored out\n// into this ASAP package. It was later adapted to RSVP which made further\n// amendments. These decisions, particularly to marginalize MessageChannel and\n// to capture the MutationObserver implementation in a closure, were integrated\n// back into ASAP proper.\n// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js\n",
+    "'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction placeHoldersCount (b64) {\n  var len = b64.length\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // the number of equal signs (place holders)\n  // if there are two placeholders, than the two characters before it\n  // represent one byte\n  // if there is only one, then the three characters before it represent 2 bytes\n  // this is just a cheap hack to not do indexOf twice\n  return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0\n}\n\nfunction byteLength (b64) {\n  // base64 is 4/3 + up to two characters of the original data\n  return b64.length * 3 / 4 - placeHoldersCount(b64)\n}\n\nfunction toByteArray (b64) {\n  var i, j, l, tmp, placeHolders, arr\n  var len = b64.length\n  placeHolders = placeHoldersCount(b64)\n\n  arr = new Arr(len * 3 / 4 - placeHolders)\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  l = placeHolders > 0 ? len - 4 : len\n\n  var L = 0\n\n  for (i = 0, j = 0; i < l; i += 4, j += 3) {\n    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]\n    arr[L++] = (tmp >> 16) & 0xFF\n    arr[L++] = (tmp >> 8) & 0xFF\n    arr[L++] = tmp & 0xFF\n  }\n\n  if (placeHolders === 2) {\n    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[L++] = tmp & 0xFF\n  } else if (placeHolders === 1) {\n    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[L++] = (tmp >> 8) & 0xFF\n    arr[L++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var output = ''\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    output += lookup[tmp >> 2]\n    output += lookup[(tmp << 4) & 0x3F]\n    output += '=='\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])\n    output += lookup[tmp >> 10]\n    output += lookup[(tmp >> 4) & 0x3F]\n    output += lookup[(tmp << 2) & 0x3F]\n    output += '='\n  }\n\n  parts.push(output)\n\n  return parts.join('')\n}\n",
     "",
     "/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nvar base64 = require('base64-js')\nvar ieee754 = require('ieee754')\nvar isArray = require('isarray')\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Use Object implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * Due to various browser bugs, sometimes the Object implementation will be used even\n * when the browser supports typed arrays.\n *\n * Note:\n *\n *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,\n *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.\n *\n *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.\n *\n *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of\n *     incorrect length in some situations.\n\n * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they\n * get the Object implementation, which is slower but behaves correctly.\n */\nBuffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined\n  ? global.TYPED_ARRAY_SUPPORT\n  : typedArraySupport()\n\n/*\n * Export kMaxLength after typed array support is determined.\n */\nexports.kMaxLength = kMaxLength()\n\nfunction typedArraySupport () {\n  try {\n    var arr = new Uint8Array(1)\n    arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}\n    return arr.foo() === 42 && // typed array instances can be augmented\n        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`\n        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`\n  } catch (e) {\n    return false\n  }\n}\n\nfunction kMaxLength () {\n  return Buffer.TYPED_ARRAY_SUPPORT\n    ? 0x7fffffff\n    : 0x3fffffff\n}\n\nfunction createBuffer (that, length) {\n  if (kMaxLength() < length) {\n    throw new RangeError('Invalid typed array length')\n  }\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    // Return an augmented `Uint8Array` instance, for best performance\n    that = new Uint8Array(length)\n    that.__proto__ = Buffer.prototype\n  } else {\n    // Fallback: Return an object instance of the Buffer class\n    if (that === null) {\n      that = new Buffer(length)\n    }\n    that.length = length\n  }\n\n  return that\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {\n    return new Buffer(arg, encodingOrOffset, length)\n  }\n\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new Error(\n        'If encoding is specified then the first argument must be a string'\n      )\n    }\n    return allocUnsafe(this, arg)\n  }\n  return from(this, arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\n// TODO: Legacy, not needed anymore. Remove in next major version.\nBuffer._augment = function (arr) {\n  arr.__proto__ = Buffer.prototype\n  return arr\n}\n\nfunction from (that, value, encodingOrOffset, length) {\n  if (typeof value === 'number') {\n    throw new TypeError('\"value\" argument must not be a number')\n  }\n\n  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {\n    return fromArrayBuffer(that, value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'string') {\n    return fromString(that, value, encodingOrOffset)\n  }\n\n  return fromObject(that, value)\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(null, value, encodingOrOffset, length)\n}\n\nif (Buffer.TYPED_ARRAY_SUPPORT) {\n  Buffer.prototype.__proto__ = Uint8Array.prototype\n  Buffer.__proto__ = Uint8Array\n  if (typeof Symbol !== 'undefined' && Symbol.species &&\n      Buffer[Symbol.species] === Buffer) {\n    // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97\n    Object.defineProperty(Buffer, Symbol.species, {\n      value: null,\n      configurable: true\n    })\n  }\n}\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be a number')\n  } else if (size < 0) {\n    throw new RangeError('\"size\" argument must not be negative')\n  }\n}\n\nfunction alloc (that, size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(that, size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpretted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(that, size).fill(fill, encoding)\n      : createBuffer(that, size).fill(fill)\n  }\n  return createBuffer(that, size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(null, size, fill, encoding)\n}\n\nfunction allocUnsafe (that, size) {\n  assertSize(size)\n  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)\n  if (!Buffer.TYPED_ARRAY_SUPPORT) {\n    for (var i = 0; i < size; ++i) {\n      that[i] = 0\n    }\n  }\n  return that\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(null, size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(null, size)\n}\n\nfunction fromString (that, string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('\"encoding\" must be a valid string encoding')\n  }\n\n  var length = byteLength(string, encoding) | 0\n  that = createBuffer(that, length)\n\n  var actual = that.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    that = that.slice(0, actual)\n  }\n\n  return that\n}\n\nfunction fromArrayLike (that, array) {\n  var length = array.length < 0 ? 0 : checked(array.length) | 0\n  that = createBuffer(that, length)\n  for (var i = 0; i < length; i += 1) {\n    that[i] = array[i] & 255\n  }\n  return that\n}\n\nfunction fromArrayBuffer (that, array, byteOffset, length) {\n  array.byteLength // this throws if `array` is not a valid ArrayBuffer\n\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\\'offset\\' is out of bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\\'length\\' is out of bounds')\n  }\n\n  if (byteOffset === undefined && length === undefined) {\n    array = new Uint8Array(array)\n  } else if (length === undefined) {\n    array = new Uint8Array(array, byteOffset)\n  } else {\n    array = new Uint8Array(array, byteOffset, length)\n  }\n\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    // Return an augmented `Uint8Array` instance, for best performance\n    that = array\n    that.__proto__ = Buffer.prototype\n  } else {\n    // Fallback: Return an object instance of the Buffer class\n    that = fromArrayLike(that, array)\n  }\n  return that\n}\n\nfunction fromObject (that, obj) {\n  if (Buffer.isBuffer(obj)) {\n    var len = checked(obj.length) | 0\n    that = createBuffer(that, len)\n\n    if (that.length === 0) {\n      return that\n    }\n\n    obj.copy(that, 0, 0, len)\n    return that\n  }\n\n  if (obj) {\n    if ((typeof ArrayBuffer !== 'undefined' &&\n        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {\n      if (typeof obj.length !== 'number' || isnan(obj.length)) {\n        return createBuffer(that, 0)\n      }\n      return fromArrayLike(that, obj)\n    }\n\n    if (obj.type === 'Buffer' && isArray(obj.data)) {\n      return fromArrayLike(that, obj.data)\n    }\n  }\n\n  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < kMaxLength()` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= kMaxLength()) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + kMaxLength().toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return !!(b != null && b._isBuffer)\n}\n\nBuffer.compare = function compare (a, b) {\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError('Arguments must be Buffers')\n  }\n\n  if (a === b) return 0\n\n  var x = a.length\n  var y = b.length\n\n  for (var i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  var i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  var buffer = Buffer.allocUnsafe(length)\n  var pos = 0\n  for (i = 0; i < list.length; ++i) {\n    var buf = list[i]\n    if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    }\n    buf.copy(buffer, pos)\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&\n      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    string = '' + string\n  }\n\n  var len = string.length\n  if (len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  var loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n      case undefined:\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) return utf8ToBytes(string).length // assume utf8\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  var loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect\n// Buffer instances.\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  var i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  var len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (var i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  var len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (var i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  var len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (var i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  var length = this.length | 0\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  var str = ''\n  var max = exports.INSPECT_MAX_BYTES\n  if (this.length > 0) {\n    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')\n    if (this.length > max) str += ' ... '\n  }\n  return '<Buffer ' + str + '>'\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError('Argument must be a Buffer')\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  var x = thisEnd - thisStart\n  var y = end - start\n  var len = Math.min(x, y)\n\n  var thisCopy = this.slice(thisStart, thisEnd)\n  var targetCopy = target.slice(start, end)\n\n  for (var i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset  // Coerce to Number.\n  if (isNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (Buffer.TYPED_ARRAY_SUPPORT &&\n        typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  var indexSize = 1\n  var arrLength = arr.length\n  var valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  var i\n  if (dir) {\n    var foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      var found = true\n      for (var j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  var remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  // must be an even number of digits\n  var strLen = string.length\n  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  for (var i = 0; i < length; ++i) {\n    var parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (isNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction latin1Write (buf, string, offset, length) {\n  return asciiWrite(buf, string, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset | 0\n    if (isFinite(length)) {\n      length = length | 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  // legacy write(string, encoding, offset, length) - remove in v0.13\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  var remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  var loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n        return asciiWrite(this, string, offset, length)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Write(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  var res = []\n\n  var i = start\n  while (i < end) {\n    var firstByte = buf[i]\n    var codePoint = null\n    var bytesPerSequence = (firstByte > 0xEF) ? 4\n      : (firstByte > 0xDF) ? 3\n      : (firstByte > 0xBF) ? 2\n      : 1\n\n    if (i + bytesPerSequence <= end) {\n      var secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nvar MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  var len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  var res = ''\n  var i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  var ret = ''\n  end = Math.min(buf.length, end)\n\n  for (var i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  var ret = ''\n  end = Math.min(buf.length, end)\n\n  for (var i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  var len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  var out = ''\n  for (var i = start; i < end; ++i) {\n    out += toHex(buf[i])\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  var bytes = buf.slice(start, end)\n  var res = ''\n  for (var i = 0; i < bytes.length; i += 2) {\n    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  var len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  var newBuf\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    newBuf = this.subarray(start, end)\n    newBuf.__proto__ = Buffer.prototype\n  } else {\n    var sliceLen = end - start\n    newBuf = new Buffer(sliceLen, undefined)\n    for (var i = 0; i < sliceLen; ++i) {\n      newBuf[i] = this[i + start]\n    }\n  }\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var val = this[offset]\n  var mul = 1\n  var i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  var val = this[offset + --byteLength]\n  var mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var val = this[offset]\n  var mul = 1\n  var i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var i = byteLength\n  var mul = 1\n  var val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  var val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  var val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) {\n    var maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  var mul = 1\n  var i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) {\n    var maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  var i = byteLength - 1\n  var mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nfunction objectWriteUInt16 (buf, value, offset, littleEndian) {\n  if (value < 0) value = 0xffff + value + 1\n  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {\n    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>\n      (littleEndian ? i : 1 - i) * 8\n  }\n}\n\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value & 0xff)\n    this[offset + 1] = (value >>> 8)\n  } else {\n    objectWriteUInt16(this, value, offset, true)\n  }\n  return offset + 2\n}\n\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 8)\n    this[offset + 1] = (value & 0xff)\n  } else {\n    objectWriteUInt16(this, value, offset, false)\n  }\n  return offset + 2\n}\n\nfunction objectWriteUInt32 (buf, value, offset, littleEndian) {\n  if (value < 0) value = 0xffffffff + value + 1\n  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {\n    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff\n  }\n}\n\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset + 3] = (value >>> 24)\n    this[offset + 2] = (value >>> 16)\n    this[offset + 1] = (value >>> 8)\n    this[offset] = (value & 0xff)\n  } else {\n    objectWriteUInt32(this, value, offset, true)\n  }\n  return offset + 4\n}\n\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 24)\n    this[offset + 1] = (value >>> 16)\n    this[offset + 2] = (value >>> 8)\n    this[offset + 3] = (value & 0xff)\n  } else {\n    objectWriteUInt32(this, value, offset, false)\n  }\n  return offset + 4\n}\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) {\n    var limit = Math.pow(2, 8 * byteLength - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  var i = 0\n  var mul = 1\n  var sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) {\n    var limit = Math.pow(2, 8 * byteLength - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  var i = byteLength - 1\n  var mul = 1\n  var sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value & 0xff)\n    this[offset + 1] = (value >>> 8)\n  } else {\n    objectWriteUInt16(this, value, offset, true)\n  }\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 8)\n    this[offset + 1] = (value & 0xff)\n  } else {\n    objectWriteUInt16(this, value, offset, false)\n  }\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value & 0xff)\n    this[offset + 1] = (value >>> 8)\n    this[offset + 2] = (value >>> 16)\n    this[offset + 3] = (value >>> 24)\n  } else {\n    objectWriteUInt32(this, value, offset, true)\n  }\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 24)\n    this[offset + 1] = (value >>> 16)\n    this[offset + 2] = (value >>> 8)\n    this[offset + 3] = (value & 0xff)\n  } else {\n    objectWriteUInt32(this, value, offset, false)\n  }\n  return offset + 4\n}\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  var len = end - start\n  var i\n\n  if (this === target && start < targetStart && targetStart < end) {\n    // descending copy from end\n    for (i = len - 1; i >= 0; --i) {\n      target[i + targetStart] = this[i + start]\n    }\n  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {\n    // ascending copy from start\n    for (i = 0; i < len; ++i) {\n      target[i + targetStart] = this[i + start]\n    }\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, start + len),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (val.length === 1) {\n      var code = val.charCodeAt(0)\n      if (code < 256) {\n        val = code\n      }\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  var i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    var bytes = Buffer.isBuffer(val)\n      ? val\n      : utf8ToBytes(new Buffer(val, encoding).toString())\n    var len = bytes.length\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// HELPER FUNCTIONS\n// ================\n\nvar INVALID_BASE64_RE = /[^+\\/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = stringtrim(str).replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction stringtrim (str) {\n  if (str.trim) return str.trim()\n  return str.replace(/^\\s+|\\s+$/g, '')\n}\n\nfunction toHex (n) {\n  if (n < 16) return '0' + n.toString(16)\n  return n.toString(16)\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  var codePoint\n  var length = string.length\n  var leadSurrogate = null\n  var bytes = []\n\n  for (var i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  var byteArray = []\n  for (var i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  var c, hi, lo\n  var byteArray = []\n  for (var i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  for (var i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\nfunction isnan (val) {\n  return val !== val // eslint-disable-line no-self-compare\n}\n",
-    "'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction placeHoldersCount (b64) {\n  var len = b64.length\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // the number of equal signs (place holders)\n  // if there are two placeholders, than the two characters before it\n  // represent one byte\n  // if there is only one, then the three characters before it represent 2 bytes\n  // this is just a cheap hack to not do indexOf twice\n  return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0\n}\n\nfunction byteLength (b64) {\n  // base64 is 4/3 + up to two characters of the original data\n  return b64.length * 3 / 4 - placeHoldersCount(b64)\n}\n\nfunction toByteArray (b64) {\n  var i, j, l, tmp, placeHolders, arr\n  var len = b64.length\n  placeHolders = placeHoldersCount(b64)\n\n  arr = new Arr(len * 3 / 4 - placeHolders)\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  l = placeHolders > 0 ? len - 4 : len\n\n  var L = 0\n\n  for (i = 0, j = 0; i < l; i += 4, j += 3) {\n    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]\n    arr[L++] = (tmp >> 16) & 0xFF\n    arr[L++] = (tmp >> 8) & 0xFF\n    arr[L++] = tmp & 0xFF\n  }\n\n  if (placeHolders === 2) {\n    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[L++] = tmp & 0xFF\n  } else if (placeHolders === 1) {\n    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[L++] = (tmp >> 8) & 0xFF\n    arr[L++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var output = ''\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    output += lookup[tmp >> 2]\n    output += lookup[(tmp << 4) & 0x3F]\n    output += '=='\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])\n    output += lookup[tmp >> 10]\n    output += lookup[(tmp >> 4) & 0x3F]\n    output += lookup[(tmp << 2) & 0x3F]\n    output += '='\n  }\n\n  parts.push(output)\n\n  return parts.join('')\n}\n",
-    "exports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = nBytes * 8 - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = nBytes * 8 - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = (value * c - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n",
-    "var toString = {}.toString;\n\nmodule.exports = Array.isArray || function (arr) {\n  return toString.call(arr) == '[object Array]';\n};\n",
-    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nfunction EventEmitter() {\n  this._events = this._events || {};\n  this._maxListeners = this._maxListeners || undefined;\n}\nmodule.exports = EventEmitter;\n\n// Backwards-compat with node 0.10.x\nEventEmitter.EventEmitter = EventEmitter;\n\nEventEmitter.prototype._events = undefined;\nEventEmitter.prototype._maxListeners = undefined;\n\n// By default EventEmitters will print a warning if more than 10 listeners are\n// added to it. This is a useful default which helps finding memory leaks.\nEventEmitter.defaultMaxListeners = 10;\n\n// Obviously not all Emitters should be limited to 10. This function allows\n// that to be increased. Set to zero for unlimited.\nEventEmitter.prototype.setMaxListeners = function(n) {\n  if (!isNumber(n) || n < 0 || isNaN(n))\n    throw TypeError('n must be a positive number');\n  this._maxListeners = n;\n  return this;\n};\n\nEventEmitter.prototype.emit = function(type) {\n  var er, handler, len, args, i, listeners;\n\n  if (!this._events)\n    this._events = {};\n\n  // If there is no 'error' event listener then throw.\n  if (type === 'error') {\n    if (!this._events.error ||\n        (isObject(this._events.error) && !this._events.error.length)) {\n      er = arguments[1];\n      if (er instanceof Error) {\n        throw er; // Unhandled 'error' event\n      } else {\n        // At least give some kind of context to the user\n        var err = new Error('Uncaught, unspecified \"error\" event. (' + er + ')');\n        err.context = er;\n        throw err;\n      }\n    }\n  }\n\n  handler = this._events[type];\n\n  if (isUndefined(handler))\n    return false;\n\n  if (isFunction(handler)) {\n    switch (arguments.length) {\n      // fast cases\n      case 1:\n        handler.call(this);\n        break;\n      case 2:\n        handler.call(this, arguments[1]);\n        break;\n      case 3:\n        handler.call(this, arguments[1], arguments[2]);\n        break;\n      // slower\n      default:\n        args = Array.prototype.slice.call(arguments, 1);\n        handler.apply(this, args);\n    }\n  } else if (isObject(handler)) {\n    args = Array.prototype.slice.call(arguments, 1);\n    listeners = handler.slice();\n    len = listeners.length;\n    for (i = 0; i < len; i++)\n      listeners[i].apply(this, args);\n  }\n\n  return true;\n};\n\nEventEmitter.prototype.addListener = function(type, listener) {\n  var m;\n\n  if (!isFunction(listener))\n    throw TypeError('listener must be a function');\n\n  if (!this._events)\n    this._events = {};\n\n  // To avoid recursion in the case that type === \"newListener\"! Before\n  // adding it to the listeners, first emit \"newListener\".\n  if (this._events.newListener)\n    this.emit('newListener', type,\n              isFunction(listener.listener) ?\n              listener.listener : listener);\n\n  if (!this._events[type])\n    // Optimize the case of one listener. Don't need the extra array object.\n    this._events[type] = listener;\n  else if (isObject(this._events[type]))\n    // If we've already got an array, just append.\n    this._events[type].push(listener);\n  else\n    // Adding the second element, need to change to array.\n    this._events[type] = [this._events[type], listener];\n\n  // Check for listener leak\n  if (isObject(this._events[type]) && !this._events[type].warned) {\n    if (!isUndefined(this._maxListeners)) {\n      m = this._maxListeners;\n    } else {\n      m = EventEmitter.defaultMaxListeners;\n    }\n\n    if (m && m > 0 && this._events[type].length > m) {\n      this._events[type].warned = true;\n      console.error('(node) warning: possible EventEmitter memory ' +\n                    'leak detected. %d listeners added. ' +\n                    'Use emitter.setMaxListeners() to increase limit.',\n                    this._events[type].length);\n      if (typeof console.trace === 'function') {\n        // not supported in IE 10\n        console.trace();\n      }\n    }\n  }\n\n  return this;\n};\n\nEventEmitter.prototype.on = EventEmitter.prototype.addListener;\n\nEventEmitter.prototype.once = function(type, listener) {\n  if (!isFunction(listener))\n    throw TypeError('listener must be a function');\n\n  var fired = false;\n\n  function g() {\n    this.removeListener(type, g);\n\n    if (!fired) {\n      fired = true;\n      listener.apply(this, arguments);\n    }\n  }\n\n  g.listener = listener;\n  this.on(type, g);\n\n  return this;\n};\n\n// emits a 'removeListener' event iff the listener was removed\nEventEmitter.prototype.removeListener = function(type, listener) {\n  var list, position, length, i;\n\n  if (!isFunction(listener))\n    throw TypeError('listener must be a function');\n\n  if (!this._events || !this._events[type])\n    return this;\n\n  list = this._events[type];\n  length = list.length;\n  position = -1;\n\n  if (list === listener ||\n      (isFunction(list.listener) && list.listener === listener)) {\n    delete this._events[type];\n    if (this._events.removeListener)\n      this.emit('removeListener', type, listener);\n\n  } else if (isObject(list)) {\n    for (i = length; i-- > 0;) {\n      if (list[i] === listener ||\n          (list[i].listener && list[i].listener === listener)) {\n        position = i;\n        break;\n      }\n    }\n\n    if (position < 0)\n      return this;\n\n    if (list.length === 1) {\n      list.length = 0;\n      delete this._events[type];\n    } else {\n      list.splice(position, 1);\n    }\n\n    if (this._events.removeListener)\n      this.emit('removeListener', type, listener);\n  }\n\n  return this;\n};\n\nEventEmitter.prototype.removeAllListeners = function(type) {\n  var key, listeners;\n\n  if (!this._events)\n    return this;\n\n  // not listening for removeListener, no need to emit\n  if (!this._events.removeListener) {\n    if (arguments.length === 0)\n      this._events = {};\n    else if (this._events[type])\n      delete this._events[type];\n    return this;\n  }\n\n  // emit removeListener for all listeners on all events\n  if (arguments.length === 0) {\n    for (key in this._events) {\n      if (key === 'removeListener') continue;\n      this.removeAllListeners(key);\n    }\n    this.removeAllListeners('removeListener');\n    this._events = {};\n    return this;\n  }\n\n  listeners = this._events[type];\n\n  if (isFunction(listeners)) {\n    this.removeListener(type, listeners);\n  } else if (listeners) {\n    // LIFO order\n    while (listeners.length)\n      this.removeListener(type, listeners[listeners.length - 1]);\n  }\n  delete this._events[type];\n\n  return this;\n};\n\nEventEmitter.prototype.listeners = function(type) {\n  var ret;\n  if (!this._events || !this._events[type])\n    ret = [];\n  else if (isFunction(this._events[type]))\n    ret = [this._events[type]];\n  else\n    ret = this._events[type].slice();\n  return ret;\n};\n\nEventEmitter.prototype.listenerCount = function(type) {\n  if (this._events) {\n    var evlistener = this._events[type];\n\n    if (isFunction(evlistener))\n      return 1;\n    else if (evlistener)\n      return evlistener.length;\n  }\n  return 0;\n};\n\nEventEmitter.listenerCount = function(emitter, type) {\n  return emitter.listenerCount(type);\n};\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\n",
-    "/*!\n * Determine if an object is a Buffer\n *\n * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>\n * @license  MIT\n */\n\n// The _isBuffer check is for Safari 5-7 support, because it's missing\n// Object.prototype.constructor. Remove this eventually\nmodule.exports = function (obj) {\n  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)\n}\n\nfunction isBuffer (obj) {\n  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)\n}\n\n// For Node v0.10 support. Remove this eventually.\nfunction isSlowBuffer (obj) {\n  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))\n}\n",
-    "// shim for using process in browser\nvar process = module.exports = {};\n\n// cached from whatever global is present so that test runners that stub it\n// don't break things.  But we need to wrap it in a try catch in case it is\n// wrapped in strict mode code which doesn't define any globals.  It's inside a\n// function because try/catches deoptimize in certain engines.\n\nvar cachedSetTimeout;\nvar cachedClearTimeout;\n\nfunction defaultSetTimout() {\n    throw new Error('setTimeout has not been defined');\n}\nfunction defaultClearTimeout () {\n    throw new Error('clearTimeout has not been defined');\n}\n(function () {\n    try {\n        if (typeof setTimeout === 'function') {\n            cachedSetTimeout = setTimeout;\n        } else {\n            cachedSetTimeout = defaultSetTimout;\n        }\n    } catch (e) {\n        cachedSetTimeout = defaultSetTimout;\n    }\n    try {\n        if (typeof clearTimeout === 'function') {\n            cachedClearTimeout = clearTimeout;\n        } else {\n            cachedClearTimeout = defaultClearTimeout;\n        }\n    } catch (e) {\n        cachedClearTimeout = defaultClearTimeout;\n    }\n} ())\nfunction runTimeout(fun) {\n    if (cachedSetTimeout === setTimeout) {\n        //normal enviroments in sane situations\n        return setTimeout(fun, 0);\n    }\n    // if setTimeout wasn't available but was latter defined\n    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {\n        cachedSetTimeout = setTimeout;\n        return setTimeout(fun, 0);\n    }\n    try {\n        // when when somebody has screwed with setTimeout but no I.E. maddness\n        return cachedSetTimeout(fun, 0);\n    } catch(e){\n        try {\n            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally\n            return cachedSetTimeout.call(null, fun, 0);\n        } catch(e){\n            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error\n            return cachedSetTimeout.call(this, fun, 0);\n        }\n    }\n\n\n}\nfunction runClearTimeout(marker) {\n    if (cachedClearTimeout === clearTimeout) {\n        //normal enviroments in sane situations\n        return clearTimeout(marker);\n    }\n    // if clearTimeout wasn't available but was latter defined\n    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {\n        cachedClearTimeout = clearTimeout;\n        return clearTimeout(marker);\n    }\n    try {\n        // when when somebody has screwed with setTimeout but no I.E. maddness\n        return cachedClearTimeout(marker);\n    } catch (e){\n        try {\n            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally\n            return cachedClearTimeout.call(null, marker);\n        } catch (e){\n            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.\n            // Some versions of I.E. have different rules for clearTimeout vs setTimeout\n            return cachedClearTimeout.call(this, marker);\n        }\n    }\n\n\n\n}\nvar queue = [];\nvar draining = false;\nvar currentQueue;\nvar queueIndex = -1;\n\nfunction cleanUpNextTick() {\n    if (!draining || !currentQueue) {\n        return;\n    }\n    draining = false;\n    if (currentQueue.length) {\n        queue = currentQueue.concat(queue);\n    } else {\n        queueIndex = -1;\n    }\n    if (queue.length) {\n        drainQueue();\n    }\n}\n\nfunction drainQueue() {\n    if (draining) {\n        return;\n    }\n    var timeout = runTimeout(cleanUpNextTick);\n    draining = true;\n\n    var len = queue.length;\n    while(len) {\n        currentQueue = queue;\n        queue = [];\n        while (++queueIndex < len) {\n            if (currentQueue) {\n                currentQueue[queueIndex].run();\n            }\n        }\n        queueIndex = -1;\n        len = queue.length;\n    }\n    currentQueue = null;\n    draining = false;\n    runClearTimeout(timeout);\n}\n\nprocess.nextTick = function (fun) {\n    var args = new Array(arguments.length - 1);\n    if (arguments.length > 1) {\n        for (var i = 1; i < arguments.length; i++) {\n            args[i - 1] = arguments[i];\n        }\n    }\n    queue.push(new Item(fun, args));\n    if (queue.length === 1 && !draining) {\n        runTimeout(drainQueue);\n    }\n};\n\n// v8 likes predictible objects\nfunction Item(fun, array) {\n    this.fun = fun;\n    this.array = array;\n}\nItem.prototype.run = function () {\n    this.fun.apply(null, this.array);\n};\nprocess.title = 'browser';\nprocess.browser = true;\nprocess.env = {};\nprocess.argv = [];\nprocess.version = ''; // empty string to avoid regexp issues\nprocess.versions = {};\n\nfunction noop() {}\n\nprocess.on = noop;\nprocess.addListener = noop;\nprocess.once = noop;\nprocess.off = noop;\nprocess.removeListener = noop;\nprocess.removeAllListeners = noop;\nprocess.emit = noop;\n\nprocess.binding = function (name) {\n    throw new Error('process.binding is not supported');\n};\n\nprocess.cwd = function () { return '/' };\nprocess.chdir = function (dir) {\n    throw new Error('process.chdir is not supported');\n};\nprocess.umask = function() { return 0; };\n",
-    "if (typeof Object.create === 'function') {\n  // implementation from standard node.js 'util' module\n  module.exports = function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor\n    ctor.prototype = Object.create(superCtor.prototype, {\n      constructor: {\n        value: ctor,\n        enumerable: false,\n        writable: true,\n        configurable: true\n      }\n    });\n  };\n} else {\n  // old school shim for old browsers\n  module.exports = function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor\n    var TempCtor = function () {}\n    TempCtor.prototype = superCtor.prototype\n    ctor.prototype = new TempCtor()\n    ctor.prototype.constructor = ctor\n  }\n}\n",
-    "module.exports = function isBuffer(arg) {\n  return arg && typeof arg === 'object'\n    && typeof arg.copy === 'function'\n    && typeof arg.fill === 'function'\n    && typeof arg.readUInt8 === 'function';\n}",
-    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar formatRegExp = /%[sdj%]/g;\nexports.format = function(f) {\n  if (!isString(f)) {\n    var objects = [];\n    for (var i = 0; i < arguments.length; i++) {\n      objects.push(inspect(arguments[i]));\n    }\n    return objects.join(' ');\n  }\n\n  var i = 1;\n  var args = arguments;\n  var len = args.length;\n  var str = String(f).replace(formatRegExp, function(x) {\n    if (x === '%%') return '%';\n    if (i >= len) return x;\n    switch (x) {\n      case '%s': return String(args[i++]);\n      case '%d': return Number(args[i++]);\n      case '%j':\n        try {\n          return JSON.stringify(args[i++]);\n        } catch (_) {\n          return '[Circular]';\n        }\n      default:\n        return x;\n    }\n  });\n  for (var x = args[i]; i < len; x = args[++i]) {\n    if (isNull(x) || !isObject(x)) {\n      str += ' ' + x;\n    } else {\n      str += ' ' + inspect(x);\n    }\n  }\n  return str;\n};\n\n\n// Mark that a method should not be used.\n// Returns a modified function which warns once by default.\n// If --no-deprecation is set, then it is a no-op.\nexports.deprecate = function(fn, msg) {\n  // Allow for deprecating things in the process of starting up.\n  if (isUndefined(global.process)) {\n    return function() {\n      return exports.deprecate(fn, msg).apply(this, arguments);\n    };\n  }\n\n  if (process.noDeprecation === true) {\n    return fn;\n  }\n\n  var warned = false;\n  function deprecated() {\n    if (!warned) {\n      if (process.throwDeprecation) {\n        throw new Error(msg);\n      } else if (process.traceDeprecation) {\n        console.trace(msg);\n      } else {\n        console.error(msg);\n      }\n      warned = true;\n    }\n    return fn.apply(this, arguments);\n  }\n\n  return deprecated;\n};\n\n\nvar debugs = {};\nvar debugEnviron;\nexports.debuglog = function(set) {\n  if (isUndefined(debugEnviron))\n    debugEnviron = process.env.NODE_DEBUG || '';\n  set = set.toUpperCase();\n  if (!debugs[set]) {\n    if (new RegExp('\\\\b' + set + '\\\\b', 'i').test(debugEnviron)) {\n      var pid = process.pid;\n      debugs[set] = function() {\n        var msg = exports.format.apply(exports, arguments);\n        console.error('%s %d: %s', set, pid, msg);\n      };\n    } else {\n      debugs[set] = function() {};\n    }\n  }\n  return debugs[set];\n};\n\n\n/**\n * Echos the value of a value. Trys to print the value out\n * in the best way possible given the different types.\n *\n * @param {Object} obj The object to print out.\n * @param {Object} opts Optional options object that alters the output.\n */\n/* legacy: obj, showHidden, depth, colors*/\nfunction inspect(obj, opts) {\n  // default options\n  var ctx = {\n    seen: [],\n    stylize: stylizeNoColor\n  };\n  // legacy...\n  if (arguments.length >= 3) ctx.depth = arguments[2];\n  if (arguments.length >= 4) ctx.colors = arguments[3];\n  if (isBoolean(opts)) {\n    // legacy...\n    ctx.showHidden = opts;\n  } else if (opts) {\n    // got an \"options\" object\n    exports._extend(ctx, opts);\n  }\n  // set default options\n  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;\n  if (isUndefined(ctx.depth)) ctx.depth = 2;\n  if (isUndefined(ctx.colors)) ctx.colors = false;\n  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;\n  if (ctx.colors) ctx.stylize = stylizeWithColor;\n  return formatValue(ctx, obj, ctx.depth);\n}\nexports.inspect = inspect;\n\n\n// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics\ninspect.colors = {\n  'bold' : [1, 22],\n  'italic' : [3, 23],\n  'underline' : [4, 24],\n  'inverse' : [7, 27],\n  'white' : [37, 39],\n  'grey' : [90, 39],\n  'black' : [30, 39],\n  'blue' : [34, 39],\n  'cyan' : [36, 39],\n  'green' : [32, 39],\n  'magenta' : [35, 39],\n  'red' : [31, 39],\n  'yellow' : [33, 39]\n};\n\n// Don't use 'blue' not visible on cmd.exe\ninspect.styles = {\n  'special': 'cyan',\n  'number': 'yellow',\n  'boolean': 'yellow',\n  'undefined': 'grey',\n  'null': 'bold',\n  'string': 'green',\n  'date': 'magenta',\n  // \"name\": intentionally not styling\n  'regexp': 'red'\n};\n\n\nfunction stylizeWithColor(str, styleType) {\n  var style = inspect.styles[styleType];\n\n  if (style) {\n    return '\\u001b[' + inspect.colors[style][0] + 'm' + str +\n           '\\u001b[' + inspect.colors[style][1] + 'm';\n  } else {\n    return str;\n  }\n}\n\n\nfunction stylizeNoColor(str, styleType) {\n  return str;\n}\n\n\nfunction arrayToHash(array) {\n  var hash = {};\n\n  array.forEach(function(val, idx) {\n    hash[val] = true;\n  });\n\n  return hash;\n}\n\n\nfunction formatValue(ctx, value, recurseTimes) {\n  // Provide a hook for user-specified inspect functions.\n  // Check that value is an object with an inspect function on it\n  if (ctx.customInspect &&\n      value &&\n      isFunction(value.inspect) &&\n      // Filter out the util module, it's inspect function is special\n      value.inspect !== exports.inspect &&\n      // Also filter out any prototype objects using the circular check.\n      !(value.constructor && value.constructor.prototype === value)) {\n    var ret = value.inspect(recurseTimes, ctx);\n    if (!isString(ret)) {\n      ret = formatValue(ctx, ret, recurseTimes);\n    }\n    return ret;\n  }\n\n  // Primitive types cannot have properties\n  var primitive = formatPrimitive(ctx, value);\n  if (primitive) {\n    return primitive;\n  }\n\n  // Look up the keys of the object.\n  var keys = Object.keys(value);\n  var visibleKeys = arrayToHash(keys);\n\n  if (ctx.showHidden) {\n    keys = Object.getOwnPropertyNames(value);\n  }\n\n  // IE doesn't make error fields non-enumerable\n  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx\n  if (isError(value)\n      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {\n    return formatError(value);\n  }\n\n  // Some type of object without properties can be shortcutted.\n  if (keys.length === 0) {\n    if (isFunction(value)) {\n      var name = value.name ? ': ' + value.name : '';\n      return ctx.stylize('[Function' + name + ']', 'special');\n    }\n    if (isRegExp(value)) {\n      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');\n    }\n    if (isDate(value)) {\n      return ctx.stylize(Date.prototype.toString.call(value), 'date');\n    }\n    if (isError(value)) {\n      return formatError(value);\n    }\n  }\n\n  var base = '', array = false, braces = ['{', '}'];\n\n  // Make Array say that they are Array\n  if (isArray(value)) {\n    array = true;\n    braces = ['[', ']'];\n  }\n\n  // Make functions say that they are functions\n  if (isFunction(value)) {\n    var n = value.name ? ': ' + value.name : '';\n    base = ' [Function' + n + ']';\n  }\n\n  // Make RegExps say that they are RegExps\n  if (isRegExp(value)) {\n    base = ' ' + RegExp.prototype.toString.call(value);\n  }\n\n  // Make dates with properties first say the date\n  if (isDate(value)) {\n    base = ' ' + Date.prototype.toUTCString.call(value);\n  }\n\n  // Make error with message first say the error\n  if (isError(value)) {\n    base = ' ' + formatError(value);\n  }\n\n  if (keys.length === 0 && (!array || value.length == 0)) {\n    return braces[0] + base + braces[1];\n  }\n\n  if (recurseTimes < 0) {\n    if (isRegExp(value)) {\n      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');\n    } else {\n      return ctx.stylize('[Object]', 'special');\n    }\n  }\n\n  ctx.seen.push(value);\n\n  var output;\n  if (array) {\n    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);\n  } else {\n    output = keys.map(function(key) {\n      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);\n    });\n  }\n\n  ctx.seen.pop();\n\n  return reduceToSingleString(output, base, braces);\n}\n\n\nfunction formatPrimitive(ctx, value) {\n  if (isUndefined(value))\n    return ctx.stylize('undefined', 'undefined');\n  if (isString(value)) {\n    var simple = '\\'' + JSON.stringify(value).replace(/^\"|\"$/g, '')\n                                             .replace(/'/g, \"\\\\'\")\n                                             .replace(/\\\\\"/g, '\"') + '\\'';\n    return ctx.stylize(simple, 'string');\n  }\n  if (isNumber(value))\n    return ctx.stylize('' + value, 'number');\n  if (isBoolean(value))\n    return ctx.stylize('' + value, 'boolean');\n  // For some reason typeof null is \"object\", so special case here.\n  if (isNull(value))\n    return ctx.stylize('null', 'null');\n}\n\n\nfunction formatError(value) {\n  return '[' + Error.prototype.toString.call(value) + ']';\n}\n\n\nfunction formatArray(ctx, value, recurseTimes, visibleKeys, keys) {\n  var output = [];\n  for (var i = 0, l = value.length; i < l; ++i) {\n    if (hasOwnProperty(value, String(i))) {\n      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,\n          String(i), true));\n    } else {\n      output.push('');\n    }\n  }\n  keys.forEach(function(key) {\n    if (!key.match(/^\\d+$/)) {\n      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,\n          key, true));\n    }\n  });\n  return output;\n}\n\n\nfunction formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {\n  var name, str, desc;\n  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };\n  if (desc.get) {\n    if (desc.set) {\n      str = ctx.stylize('[Getter/Setter]', 'special');\n    } else {\n      str = ctx.stylize('[Getter]', 'special');\n    }\n  } else {\n    if (desc.set) {\n      str = ctx.stylize('[Setter]', 'special');\n    }\n  }\n  if (!hasOwnProperty(visibleKeys, key)) {\n    name = '[' + key + ']';\n  }\n  if (!str) {\n    if (ctx.seen.indexOf(desc.value) < 0) {\n      if (isNull(recurseTimes)) {\n        str = formatValue(ctx, desc.value, null);\n      } else {\n        str = formatValue(ctx, desc.value, recurseTimes - 1);\n      }\n      if (str.indexOf('\\n') > -1) {\n        if (array) {\n          str = str.split('\\n').map(function(line) {\n            return '  ' + line;\n          }).join('\\n').substr(2);\n        } else {\n          str = '\\n' + str.split('\\n').map(function(line) {\n            return '   ' + line;\n          }).join('\\n');\n        }\n      }\n    } else {\n      str = ctx.stylize('[Circular]', 'special');\n    }\n  }\n  if (isUndefined(name)) {\n    if (array && key.match(/^\\d+$/)) {\n      return str;\n    }\n    name = JSON.stringify('' + key);\n    if (name.match(/^\"([a-zA-Z_][a-zA-Z_0-9]*)\"$/)) {\n      name = name.substr(1, name.length - 2);\n      name = ctx.stylize(name, 'name');\n    } else {\n      name = name.replace(/'/g, \"\\\\'\")\n                 .replace(/\\\\\"/g, '\"')\n                 .replace(/(^\"|\"$)/g, \"'\");\n      name = ctx.stylize(name, 'string');\n    }\n  }\n\n  return name + ': ' + str;\n}\n\n\nfunction reduceToSingleString(output, base, braces) {\n  var numLinesEst = 0;\n  var length = output.reduce(function(prev, cur) {\n    numLinesEst++;\n    if (cur.indexOf('\\n') >= 0) numLinesEst++;\n    return prev + cur.replace(/\\u001b\\[\\d\\d?m/g, '').length + 1;\n  }, 0);\n\n  if (length > 60) {\n    return braces[0] +\n           (base === '' ? '' : base + '\\n ') +\n           ' ' +\n           output.join(',\\n  ') +\n           ' ' +\n           braces[1];\n  }\n\n  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];\n}\n\n\n// NOTE: These type checking functions intentionally don't use `instanceof`\n// because it is fragile and can be easily faked with `Object.create()`.\nfunction isArray(ar) {\n  return Array.isArray(ar);\n}\nexports.isArray = isArray;\n\nfunction isBoolean(arg) {\n  return typeof arg === 'boolean';\n}\nexports.isBoolean = isBoolean;\n\nfunction isNull(arg) {\n  return arg === null;\n}\nexports.isNull = isNull;\n\nfunction isNullOrUndefined(arg) {\n  return arg == null;\n}\nexports.isNullOrUndefined = isNullOrUndefined;\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\nexports.isNumber = isNumber;\n\nfunction isString(arg) {\n  return typeof arg === 'string';\n}\nexports.isString = isString;\n\nfunction isSymbol(arg) {\n  return typeof arg === 'symbol';\n}\nexports.isSymbol = isSymbol;\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\nexports.isUndefined = isUndefined;\n\nfunction isRegExp(re) {\n  return isObject(re) && objectToString(re) === '[object RegExp]';\n}\nexports.isRegExp = isRegExp;\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\nexports.isObject = isObject;\n\nfunction isDate(d) {\n  return isObject(d) && objectToString(d) === '[object Date]';\n}\nexports.isDate = isDate;\n\nfunction isError(e) {\n  return isObject(e) &&\n      (objectToString(e) === '[object Error]' || e instanceof Error);\n}\nexports.isError = isError;\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\nexports.isFunction = isFunction;\n\nfunction isPrimitive(arg) {\n  return arg === null ||\n         typeof arg === 'boolean' ||\n         typeof arg === 'number' ||\n         typeof arg === 'string' ||\n         typeof arg === 'symbol' ||  // ES6 symbol\n         typeof arg === 'undefined';\n}\nexports.isPrimitive = isPrimitive;\n\nexports.isBuffer = require('./support/isBuffer');\n\nfunction objectToString(o) {\n  return Object.prototype.toString.call(o);\n}\n\n\nfunction pad(n) {\n  return n < 10 ? '0' + n.toString(10) : n.toString(10);\n}\n\n\nvar months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',\n              'Oct', 'Nov', 'Dec'];\n\n// 26 Feb 16:19:34\nfunction timestamp() {\n  var d = new Date();\n  var time = [pad(d.getHours()),\n              pad(d.getMinutes()),\n              pad(d.getSeconds())].join(':');\n  return [d.getDate(), months[d.getMonth()], time].join(' ');\n}\n\n\n// log is just a thin wrapper to console.log that prepends a timestamp\nexports.log = function() {\n  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));\n};\n\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * The Function.prototype.inherits from lang.js rewritten as a standalone\n * function (not on Function.prototype). NOTE: If this file is to be loaded\n * during bootstrapping this function needs to be rewritten using some native\n * functions as prototype setup using normal JavaScript does not work as\n * expected during bootstrapping (see mirror.js in r114903).\n *\n * @param {function} ctor Constructor function which needs to inherit the\n *     prototype.\n * @param {function} superCtor Constructor function to inherit prototype from.\n */\nexports.inherits = require('inherits');\n\nexports._extend = function(origin, add) {\n  // Don't do anything if add isn't an object\n  if (!add || !isObject(add)) return origin;\n\n  var keys = Object.keys(add);\n  var i = keys.length;\n  while (i--) {\n    origin[keys[i]] = add[keys[i]];\n  }\n  return origin;\n};\n\nfunction hasOwnProperty(obj, prop) {\n  return Object.prototype.hasOwnProperty.call(obj, prop);\n}\n",
     "require('../modules/es6.object.to-string');\nrequire('../modules/es6.string.iterator');\nrequire('../modules/web.dom.iterable');\nrequire('../modules/es6.promise');\nmodule.exports = require('../modules/_core').Promise;",
     "module.exports = function(it){\n  if(typeof it != 'function')throw TypeError(it + ' is not a function!');\n  return it;\n};",
     "// 22.1.3.31 Array.prototype[@@unscopables]\nvar UNSCOPABLES = require('./_wks')('unscopables')\n  , ArrayProto  = Array.prototype;\nif(ArrayProto[UNSCOPABLES] == undefined)require('./_hide')(ArrayProto, UNSCOPABLES, {});\nmodule.exports = function(key){\n  ArrayProto[UNSCOPABLES][key] = true;\n};",
@@ -354,8 +348,10 @@
     "'use strict';\nvar LIBRARY            = require('./_library')\n  , global             = require('./_global')\n  , ctx                = require('./_ctx')\n  , classof            = require('./_classof')\n  , $export            = require('./_export')\n  , isObject           = require('./_is-object')\n  , aFunction          = require('./_a-function')\n  , anInstance         = require('./_an-instance')\n  , forOf              = require('./_for-of')\n  , speciesConstructor = require('./_species-constructor')\n  , task               = require('./_task').set\n  , microtask          = require('./_microtask')()\n  , PROMISE            = 'Promise'\n  , TypeError          = global.TypeError\n  , process            = global.process\n  , $Promise           = global[PROMISE]\n  , process            = global.process\n  , isNode             = classof(process) == 'process'\n  , empty              = function(){ /* empty */ }\n  , Internal, GenericPromiseCapability, Wrapper;\n\nvar USE_NATIVE = !!function(){\n  try {\n    // correct subclassing with @@species support\n    var promise     = $Promise.resolve(1)\n      , FakePromise = (promise.constructor = {})[require('./_wks')('species')] = function(exec){ exec(empty, empty); };\n    // unhandled rejections tracking support, NodeJS Promise without it fails @@species test\n    return (isNode || typeof PromiseRejectionEvent == 'function') && promise.then(empty) instanceof FakePromise;\n  } catch(e){ /* empty */ }\n}();\n\n// helpers\nvar sameConstructor = function(a, b){\n  // with library wrapper special case\n  return a === b || a === $Promise && b === Wrapper;\n};\nvar isThenable = function(it){\n  var then;\n  return isObject(it) && typeof (then = it.then) == 'function' ? then : false;\n};\nvar newPromiseCapability = function(C){\n  return sameConstructor($Promise, C)\n    ? new PromiseCapability(C)\n    : new GenericPromiseCapability(C);\n};\nvar PromiseCapability = GenericPromiseCapability = function(C){\n  var resolve, reject;\n  this.promise = new C(function($$resolve, $$reject){\n    if(resolve !== undefined || reject !== undefined)throw TypeError('Bad Promise constructor');\n    resolve = $$resolve;\n    reject  = $$reject;\n  });\n  this.resolve = aFunction(resolve);\n  this.reject  = aFunction(reject);\n};\nvar perform = function(exec){\n  try {\n    exec();\n  } catch(e){\n    return {error: e};\n  }\n};\nvar notify = function(promise, isReject){\n  if(promise._n)return;\n  promise._n = true;\n  var chain = promise._c;\n  microtask(function(){\n    var value = promise._v\n      , ok    = promise._s == 1\n      , i     = 0;\n    var run = function(reaction){\n      var handler = ok ? reaction.ok : reaction.fail\n        , resolve = reaction.resolve\n        , reject  = reaction.reject\n        , domain  = reaction.domain\n        , result, then;\n      try {\n        if(handler){\n          if(!ok){\n            if(promise._h == 2)onHandleUnhandled(promise);\n            promise._h = 1;\n          }\n          if(handler === true)result = value;\n          else {\n            if(domain)domain.enter();\n            result = handler(value);\n            if(domain)domain.exit();\n          }\n          if(result === reaction.promise){\n            reject(TypeError('Promise-chain cycle'));\n          } else if(then = isThenable(result)){\n            then.call(result, resolve, reject);\n          } else resolve(result);\n        } else reject(value);\n      } catch(e){\n        reject(e);\n      }\n    };\n    while(chain.length > i)run(chain[i++]); // variable length - can't use forEach\n    promise._c = [];\n    promise._n = false;\n    if(isReject && !promise._h)onUnhandled(promise);\n  });\n};\nvar onUnhandled = function(promise){\n  task.call(global, function(){\n    var value = promise._v\n      , abrupt, handler, console;\n    if(isUnhandled(promise)){\n      abrupt = perform(function(){\n        if(isNode){\n          process.emit('unhandledRejection', value, promise);\n        } else if(handler = global.onunhandledrejection){\n          handler({promise: promise, reason: value});\n        } else if((console = global.console) && console.error){\n          console.error('Unhandled promise rejection', value);\n        }\n      });\n      // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should\n      promise._h = isNode || isUnhandled(promise) ? 2 : 1;\n    } promise._a = undefined;\n    if(abrupt)throw abrupt.error;\n  });\n};\nvar isUnhandled = function(promise){\n  if(promise._h == 1)return false;\n  var chain = promise._a || promise._c\n    , i     = 0\n    , reaction;\n  while(chain.length > i){\n    reaction = chain[i++];\n    if(reaction.fail || !isUnhandled(reaction.promise))return false;\n  } return true;\n};\nvar onHandleUnhandled = function(promise){\n  task.call(global, function(){\n    var handler;\n    if(isNode){\n      process.emit('rejectionHandled', promise);\n    } else if(handler = global.onrejectionhandled){\n      handler({promise: promise, reason: promise._v});\n    }\n  });\n};\nvar $reject = function(value){\n  var promise = this;\n  if(promise._d)return;\n  promise._d = true;\n  promise = promise._w || promise; // unwrap\n  promise._v = value;\n  promise._s = 2;\n  if(!promise._a)promise._a = promise._c.slice();\n  notify(promise, true);\n};\nvar $resolve = function(value){\n  var promise = this\n    , then;\n  if(promise._d)return;\n  promise._d = true;\n  promise = promise._w || promise; // unwrap\n  try {\n    if(promise === value)throw TypeError(\"Promise can't be resolved itself\");\n    if(then = isThenable(value)){\n      microtask(function(){\n        var wrapper = {_w: promise, _d: false}; // wrap\n        try {\n          then.call(value, ctx($resolve, wrapper, 1), ctx($reject, wrapper, 1));\n        } catch(e){\n          $reject.call(wrapper, e);\n        }\n      });\n    } else {\n      promise._v = value;\n      promise._s = 1;\n      notify(promise, false);\n    }\n  } catch(e){\n    $reject.call({_w: promise, _d: false}, e); // wrap\n  }\n};\n\n// constructor polyfill\nif(!USE_NATIVE){\n  // 25.4.3.1 Promise(executor)\n  $Promise = function Promise(executor){\n    anInstance(this, $Promise, PROMISE, '_h');\n    aFunction(executor);\n    Internal.call(this);\n    try {\n      executor(ctx($resolve, this, 1), ctx($reject, this, 1));\n    } catch(err){\n      $reject.call(this, err);\n    }\n  };\n  Internal = function Promise(executor){\n    this._c = [];             // <- awaiting reactions\n    this._a = undefined;      // <- checked in isUnhandled reactions\n    this._s = 0;              // <- state\n    this._d = false;          // <- done\n    this._v = undefined;      // <- value\n    this._h = 0;              // <- rejection state, 0 - default, 1 - handled, 2 - unhandled\n    this._n = false;          // <- notify\n  };\n  Internal.prototype = require('./_redefine-all')($Promise.prototype, {\n    // 25.4.5.3 Promise.prototype.then(onFulfilled, onRejected)\n    then: function then(onFulfilled, onRejected){\n      var reaction    = newPromiseCapability(speciesConstructor(this, $Promise));\n      reaction.ok     = typeof onFulfilled == 'function' ? onFulfilled : true;\n      reaction.fail   = typeof onRejected == 'function' && onRejected;\n      reaction.domain = isNode ? process.domain : undefined;\n      this._c.push(reaction);\n      if(this._a)this._a.push(reaction);\n      if(this._s)notify(this, false);\n      return reaction.promise;\n    },\n    // 25.4.5.1 Promise.prototype.catch(onRejected)\n    'catch': function(onRejected){\n      return this.then(undefined, onRejected);\n    }\n  });\n  PromiseCapability = function(){\n    var promise  = new Internal;\n    this.promise = promise;\n    this.resolve = ctx($resolve, promise, 1);\n    this.reject  = ctx($reject, promise, 1);\n  };\n}\n\n$export($export.G + $export.W + $export.F * !USE_NATIVE, {Promise: $Promise});\nrequire('./_set-to-string-tag')($Promise, PROMISE);\nrequire('./_set-species')(PROMISE);\nWrapper = require('./_core')[PROMISE];\n\n// statics\n$export($export.S + $export.F * !USE_NATIVE, PROMISE, {\n  // 25.4.4.5 Promise.reject(r)\n  reject: function reject(r){\n    var capability = newPromiseCapability(this)\n      , $$reject   = capability.reject;\n    $$reject(r);\n    return capability.promise;\n  }\n});\n$export($export.S + $export.F * (LIBRARY || !USE_NATIVE), PROMISE, {\n  // 25.4.4.6 Promise.resolve(x)\n  resolve: function resolve(x){\n    // instanceof instead of internal slot check because we should fix it without replacement native Promise core\n    if(x instanceof $Promise && sameConstructor(x.constructor, this))return x;\n    var capability = newPromiseCapability(this)\n      , $$resolve  = capability.resolve;\n    $$resolve(x);\n    return capability.promise;\n  }\n});\n$export($export.S + $export.F * !(USE_NATIVE && require('./_iter-detect')(function(iter){\n  $Promise.all(iter)['catch'](empty);\n})), PROMISE, {\n  // 25.4.4.1 Promise.all(iterable)\n  all: function all(iterable){\n    var C          = this\n      , capability = newPromiseCapability(C)\n      , resolve    = capability.resolve\n      , reject     = capability.reject;\n    var abrupt = perform(function(){\n      var values    = []\n        , index     = 0\n        , remaining = 1;\n      forOf(iterable, false, function(promise){\n        var $index        = index++\n          , alreadyCalled = false;\n        values.push(undefined);\n        remaining++;\n        C.resolve(promise).then(function(value){\n          if(alreadyCalled)return;\n          alreadyCalled  = true;\n          values[$index] = value;\n          --remaining || resolve(values);\n        }, reject);\n      });\n      --remaining || resolve(values);\n    });\n    if(abrupt)reject(abrupt.error);\n    return capability.promise;\n  },\n  // 25.4.4.4 Promise.race(iterable)\n  race: function race(iterable){\n    var C          = this\n      , capability = newPromiseCapability(C)\n      , reject     = capability.reject;\n    var abrupt = perform(function(){\n      forOf(iterable, false, function(promise){\n        C.resolve(promise).then(capability.resolve, reject);\n      });\n    });\n    if(abrupt)reject(abrupt.error);\n    return capability.promise;\n  }\n});",
     "'use strict';\nvar $at  = require('./_string-at')(true);\n\n// 21.1.3.27 String.prototype[@@iterator]()\nrequire('./_iter-define')(String, 'String', function(iterated){\n  this._t = String(iterated); // target\n  this._i = 0;                // next index\n// 21.1.5.2.1 %StringIteratorPrototype%.next()\n}, function(){\n  var O     = this._t\n    , index = this._i\n    , point;\n  if(index >= O.length)return {value: undefined, done: true};\n  point = $at(O, index);\n  this._i += point.length;\n  return {value: point, done: false};\n});",
     "var $iterators    = require('./es6.array.iterator')\n  , redefine      = require('./_redefine')\n  , global        = require('./_global')\n  , hide          = require('./_hide')\n  , Iterators     = require('./_iterators')\n  , wks           = require('./_wks')\n  , ITERATOR      = wks('iterator')\n  , TO_STRING_TAG = wks('toStringTag')\n  , ArrayValues   = Iterators.Array;\n\nfor(var collections = ['NodeList', 'DOMTokenList', 'MediaList', 'StyleSheetList', 'CSSRuleList'], i = 0; i < 5; i++){\n  var NAME       = collections[i]\n    , Collection = global[NAME]\n    , proto      = Collection && Collection.prototype\n    , key;\n  if(proto){\n    if(!proto[ITERATOR])hide(proto, ITERATOR, ArrayValues);\n    if(!proto[TO_STRING_TAG])hide(proto, TO_STRING_TAG, NAME);\n    Iterators[NAME] = ArrayValues;\n    for(key in $iterators)if(!proto[key])redefine(proto, key, $iterators[key], true);\n  }\n}",
+    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// NOTE: These type checking functions intentionally don't use `instanceof`\n// because it is fragile and can be easily faked with `Object.create()`.\n\nfunction isArray(arg) {\n  if (Array.isArray) {\n    return Array.isArray(arg);\n  }\n  return objectToString(arg) === '[object Array]';\n}\nexports.isArray = isArray;\n\nfunction isBoolean(arg) {\n  return typeof arg === 'boolean';\n}\nexports.isBoolean = isBoolean;\n\nfunction isNull(arg) {\n  return arg === null;\n}\nexports.isNull = isNull;\n\nfunction isNullOrUndefined(arg) {\n  return arg == null;\n}\nexports.isNullOrUndefined = isNullOrUndefined;\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\nexports.isNumber = isNumber;\n\nfunction isString(arg) {\n  return typeof arg === 'string';\n}\nexports.isString = isString;\n\nfunction isSymbol(arg) {\n  return typeof arg === 'symbol';\n}\nexports.isSymbol = isSymbol;\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\nexports.isUndefined = isUndefined;\n\nfunction isRegExp(re) {\n  return objectToString(re) === '[object RegExp]';\n}\nexports.isRegExp = isRegExp;\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\nexports.isObject = isObject;\n\nfunction isDate(d) {\n  return objectToString(d) === '[object Date]';\n}\nexports.isDate = isDate;\n\nfunction isError(e) {\n  return (objectToString(e) === '[object Error]' || e instanceof Error);\n}\nexports.isError = isError;\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\nexports.isFunction = isFunction;\n\nfunction isPrimitive(arg) {\n  return arg === null ||\n         typeof arg === 'boolean' ||\n         typeof arg === 'number' ||\n         typeof arg === 'string' ||\n         typeof arg === 'symbol' ||  // ES6 symbol\n         typeof arg === 'undefined';\n}\nexports.isPrimitive = isPrimitive;\n\nexports.isBuffer = Buffer.isBuffer;\n\nfunction objectToString(o) {\n  return Object.prototype.toString.call(o);\n}\n",
     "// (c) Dean McNamee <dean@gmail.com>, 2012.\n//\n// https://github.com/deanm/css-color-parser-js\n//\n// Permission is hereby granted, free of charge, to any person obtaining a copy\n// of this software and associated documentation files (the \"Software\"), to\n// deal in the Software without restriction, including without limitation the\n// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n// sell copies of the Software, and to permit persons to whom the Software is\n// furnished to do so, subject to the following conditions:\n//\n// The above copyright notice and this permission notice shall be included in\n// all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n// IN THE SOFTWARE.\n\n// http://www.w3.org/TR/css3-color/\nvar kCSSColorTable = {\n  \"transparent\": [0,0,0,0], \"aliceblue\": [240,248,255,1],\n  \"antiquewhite\": [250,235,215,1], \"aqua\": [0,255,255,1],\n  \"aquamarine\": [127,255,212,1], \"azure\": [240,255,255,1],\n  \"beige\": [245,245,220,1], \"bisque\": [255,228,196,1],\n  \"black\": [0,0,0,1], \"blanchedalmond\": [255,235,205,1],\n  \"blue\": [0,0,255,1], \"blueviolet\": [138,43,226,1],\n  \"brown\": [165,42,42,1], \"burlywood\": [222,184,135,1],\n  \"cadetblue\": [95,158,160,1], \"chartreuse\": [127,255,0,1],\n  \"chocolate\": [210,105,30,1], \"coral\": [255,127,80,1],\n  \"cornflowerblue\": [100,149,237,1], \"cornsilk\": [255,248,220,1],\n  \"crimson\": [220,20,60,1], \"cyan\": [0,255,255,1],\n  \"darkblue\": [0,0,139,1], \"darkcyan\": [0,139,139,1],\n  \"darkgoldenrod\": [184,134,11,1], \"darkgray\": [169,169,169,1],\n  \"darkgreen\": [0,100,0,1], \"darkgrey\": [169,169,169,1],\n  \"darkkhaki\": [189,183,107,1], \"darkmagenta\": [139,0,139,1],\n  \"darkolivegreen\": [85,107,47,1], \"darkorange\": [255,140,0,1],\n  \"darkorchid\": [153,50,204,1], \"darkred\": [139,0,0,1],\n  \"darksalmon\": [233,150,122,1], \"darkseagreen\": [143,188,143,1],\n  \"darkslateblue\": [72,61,139,1], \"darkslategray\": [47,79,79,1],\n  \"darkslategrey\": [47,79,79,1], \"darkturquoise\": [0,206,209,1],\n  \"darkviolet\": [148,0,211,1], \"deeppink\": [255,20,147,1],\n  \"deepskyblue\": [0,191,255,1], \"dimgray\": [105,105,105,1],\n  \"dimgrey\": [105,105,105,1], \"dodgerblue\": [30,144,255,1],\n  \"firebrick\": [178,34,34,1], \"floralwhite\": [255,250,240,1],\n  \"forestgreen\": [34,139,34,1], \"fuchsia\": [255,0,255,1],\n  \"gainsboro\": [220,220,220,1], \"ghostwhite\": [248,248,255,1],\n  \"gold\": [255,215,0,1], \"goldenrod\": [218,165,32,1],\n  \"gray\": [128,128,128,1], \"green\": [0,128,0,1],\n  \"greenyellow\": [173,255,47,1], \"grey\": [128,128,128,1],\n  \"honeydew\": [240,255,240,1], \"hotpink\": [255,105,180,1],\n  \"indianred\": [205,92,92,1], \"indigo\": [75,0,130,1],\n  \"ivory\": [255,255,240,1], \"khaki\": [240,230,140,1],\n  \"lavender\": [230,230,250,1], \"lavenderblush\": [255,240,245,1],\n  \"lawngreen\": [124,252,0,1], \"lemonchiffon\": [255,250,205,1],\n  \"lightblue\": [173,216,230,1], \"lightcoral\": [240,128,128,1],\n  \"lightcyan\": [224,255,255,1], \"lightgoldenrodyellow\": [250,250,210,1],\n  \"lightgray\": [211,211,211,1], \"lightgreen\": [144,238,144,1],\n  \"lightgrey\": [211,211,211,1], \"lightpink\": [255,182,193,1],\n  \"lightsalmon\": [255,160,122,1], \"lightseagreen\": [32,178,170,1],\n  \"lightskyblue\": [135,206,250,1], \"lightslategray\": [119,136,153,1],\n  \"lightslategrey\": [119,136,153,1], \"lightsteelblue\": [176,196,222,1],\n  \"lightyellow\": [255,255,224,1], \"lime\": [0,255,0,1],\n  \"limegreen\": [50,205,50,1], \"linen\": [250,240,230,1],\n  \"magenta\": [255,0,255,1], \"maroon\": [128,0,0,1],\n  \"mediumaquamarine\": [102,205,170,1], \"mediumblue\": [0,0,205,1],\n  \"mediumorchid\": [186,85,211,1], \"mediumpurple\": [147,112,219,1],\n  \"mediumseagreen\": [60,179,113,1], \"mediumslateblue\": [123,104,238,1],\n  \"mediumspringgreen\": [0,250,154,1], \"mediumturquoise\": [72,209,204,1],\n  \"mediumvioletred\": [199,21,133,1], \"midnightblue\": [25,25,112,1],\n  \"mintcream\": [245,255,250,1], \"mistyrose\": [255,228,225,1],\n  \"moccasin\": [255,228,181,1], \"navajowhite\": [255,222,173,1],\n  \"navy\": [0,0,128,1], \"oldlace\": [253,245,230,1],\n  \"olive\": [128,128,0,1], \"olivedrab\": [107,142,35,1],\n  \"orange\": [255,165,0,1], \"orangered\": [255,69,0,1],\n  \"orchid\": [218,112,214,1], \"palegoldenrod\": [238,232,170,1],\n  \"palegreen\": [152,251,152,1], \"paleturquoise\": [175,238,238,1],\n  \"palevioletred\": [219,112,147,1], \"papayawhip\": [255,239,213,1],\n  \"peachpuff\": [255,218,185,1], \"peru\": [205,133,63,1],\n  \"pink\": [255,192,203,1], \"plum\": [221,160,221,1],\n  \"powderblue\": [176,224,230,1], \"purple\": [128,0,128,1],\n  \"rebeccapurple\": [102,51,153,1],\n  \"red\": [255,0,0,1], \"rosybrown\": [188,143,143,1],\n  \"royalblue\": [65,105,225,1], \"saddlebrown\": [139,69,19,1],\n  \"salmon\": [250,128,114,1], \"sandybrown\": [244,164,96,1],\n  \"seagreen\": [46,139,87,1], \"seashell\": [255,245,238,1],\n  \"sienna\": [160,82,45,1], \"silver\": [192,192,192,1],\n  \"skyblue\": [135,206,235,1], \"slateblue\": [106,90,205,1],\n  \"slategray\": [112,128,144,1], \"slategrey\": [112,128,144,1],\n  \"snow\": [255,250,250,1], \"springgreen\": [0,255,127,1],\n  \"steelblue\": [70,130,180,1], \"tan\": [210,180,140,1],\n  \"teal\": [0,128,128,1], \"thistle\": [216,191,216,1],\n  \"tomato\": [255,99,71,1], \"turquoise\": [64,224,208,1],\n  \"violet\": [238,130,238,1], \"wheat\": [245,222,179,1],\n  \"white\": [255,255,255,1], \"whitesmoke\": [245,245,245,1],\n  \"yellow\": [255,255,0,1], \"yellowgreen\": [154,205,50,1]}\n\nfunction clamp_css_byte(i) {  // Clamp to integer 0 .. 255.\n  i = Math.round(i);  // Seems to be what Chrome does (vs truncation).\n  return i < 0 ? 0 : i > 255 ? 255 : i;\n}\n\nfunction clamp_css_float(f) {  // Clamp to float 0.0 .. 1.0.\n  return f < 0 ? 0 : f > 1 ? 1 : f;\n}\n\nfunction parse_css_int(str) {  // int or percentage.\n  if (str[str.length - 1] === '%')\n    return clamp_css_byte(parseFloat(str) / 100 * 255);\n  return clamp_css_byte(parseInt(str));\n}\n\nfunction parse_css_float(str) {  // float or percentage.\n  if (str[str.length - 1] === '%')\n    return clamp_css_float(parseFloat(str) / 100);\n  return clamp_css_float(parseFloat(str));\n}\n\nfunction css_hue_to_rgb(m1, m2, h) {\n  if (h < 0) h += 1;\n  else if (h > 1) h -= 1;\n\n  if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;\n  if (h * 2 < 1) return m2;\n  if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;\n  return m1;\n}\n\nfunction parseCSSColor(css_str) {\n  // Remove all whitespace, not compliant, but should just be more accepting.\n  var str = css_str.replace(/ /g, '').toLowerCase();\n\n  // Color keywords (and transparent) lookup.\n  if (str in kCSSColorTable) return kCSSColorTable[str].slice();  // dup.\n\n  // #abc and #abc123 syntax.\n  if (str[0] === '#') {\n    if (str.length === 4) {\n      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.\n      if (!(iv >= 0 && iv <= 0xfff)) return null;  // Covers NaN.\n      return [((iv & 0xf00) >> 4) | ((iv & 0xf00) >> 8),\n              (iv & 0xf0) | ((iv & 0xf0) >> 4),\n              (iv & 0xf) | ((iv & 0xf) << 4),\n              1];\n    } else if (str.length === 7) {\n      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.\n      if (!(iv >= 0 && iv <= 0xffffff)) return null;  // Covers NaN.\n      return [(iv & 0xff0000) >> 16,\n              (iv & 0xff00) >> 8,\n              iv & 0xff,\n              1];\n    }\n\n    return null;\n  }\n\n  var op = str.indexOf('('), ep = str.indexOf(')');\n  if (op !== -1 && ep + 1 === str.length) {\n    var fname = str.substr(0, op);\n    var params = str.substr(op+1, ep-(op+1)).split(',');\n    var alpha = 1;  // To allow case fallthrough.\n    switch (fname) {\n      case 'rgba':\n        if (params.length !== 4) return null;\n        alpha = parse_css_float(params.pop());\n        // Fall through.\n      case 'rgb':\n        if (params.length !== 3) return null;\n        return [parse_css_int(params[0]),\n                parse_css_int(params[1]),\n                parse_css_int(params[2]),\n                alpha];\n      case 'hsla':\n        if (params.length !== 4) return null;\n        alpha = parse_css_float(params.pop());\n        // Fall through.\n      case 'hsl':\n        if (params.length !== 3) return null;\n        var h = (((parseFloat(params[0]) % 360) + 360) % 360) / 360;  // 0 .. 1\n        // NOTE(deanm): According to the CSS spec s/l should only be\n        // percentages, but we don't bother and let float or percentage.\n        var s = parse_css_float(params[1]);\n        var l = parse_css_float(params[2]);\n        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;\n        var m1 = l * 2 - m2;\n        return [clamp_css_byte(css_hue_to_rgb(m1, m2, h+1/3) * 255),\n                clamp_css_byte(css_hue_to_rgb(m1, m2, h) * 255),\n                clamp_css_byte(css_hue_to_rgb(m1, m2, h-1/3) * 255),\n                alpha];\n      default:\n        return null;\n    }\n  }\n\n  return null;\n}\n\ntry { exports.parseCSSColor = parseCSSColor } catch(e) { }\n",
     "'use strict';\n\nmodule.exports = earcut;\n\nfunction earcut(data, holeIndices, dim) {\n\n    dim = dim || 2;\n\n    var hasHoles = holeIndices && holeIndices.length,\n        outerLen = hasHoles ? holeIndices[0] * dim : data.length,\n        outerNode = linkedList(data, 0, outerLen, dim, true),\n        triangles = [];\n\n    if (!outerNode) return triangles;\n\n    var minX, minY, maxX, maxY, x, y, size;\n\n    if (hasHoles) outerNode = eliminateHoles(data, holeIndices, outerNode, dim);\n\n    // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox\n    if (data.length > 80 * dim) {\n        minX = maxX = data[0];\n        minY = maxY = data[1];\n\n        for (var i = dim; i < outerLen; i += dim) {\n            x = data[i];\n            y = data[i + 1];\n            if (x < minX) minX = x;\n            if (y < minY) minY = y;\n            if (x > maxX) maxX = x;\n            if (y > maxY) maxY = y;\n        }\n\n        // minX, minY and size are later used to transform coords into integers for z-order calculation\n        size = Math.max(maxX - minX, maxY - minY);\n    }\n\n    earcutLinked(outerNode, triangles, dim, minX, minY, size);\n\n    return triangles;\n}\n\n// create a circular doubly linked list from polygon points in the specified winding order\nfunction linkedList(data, start, end, dim, clockwise) {\n    var i, last;\n\n    if (clockwise === (signedArea(data, start, end, dim) > 0)) {\n        for (i = start; i < end; i += dim) last = insertNode(i, data[i], data[i + 1], last);\n    } else {\n        for (i = end - dim; i >= start; i -= dim) last = insertNode(i, data[i], data[i + 1], last);\n    }\n\n    if (last && equals(last, last.next)) {\n        removeNode(last);\n        last = last.next;\n    }\n\n    return last;\n}\n\n// eliminate colinear or duplicate points\nfunction filterPoints(start, end) {\n    if (!start) return start;\n    if (!end) end = start;\n\n    var p = start,\n        again;\n    do {\n        again = false;\n\n        if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {\n            removeNode(p);\n            p = end = p.prev;\n            if (p === p.next) return null;\n            again = true;\n\n        } else {\n            p = p.next;\n        }\n    } while (again || p !== end);\n\n    return end;\n}\n\n// main ear slicing loop which triangulates a polygon (given as a linked list)\nfunction earcutLinked(ear, triangles, dim, minX, minY, size, pass) {\n    if (!ear) return;\n\n    // interlink polygon nodes in z-order\n    if (!pass && size) indexCurve(ear, minX, minY, size);\n\n    var stop = ear,\n        prev, next;\n\n    // iterate through ears, slicing them one by one\n    while (ear.prev !== ear.next) {\n        prev = ear.prev;\n        next = ear.next;\n\n        if (size ? isEarHashed(ear, minX, minY, size) : isEar(ear)) {\n            // cut off the triangle\n            triangles.push(prev.i / dim);\n            triangles.push(ear.i / dim);\n            triangles.push(next.i / dim);\n\n            removeNode(ear);\n\n            // skipping the next vertice leads to less sliver triangles\n            ear = next.next;\n            stop = next.next;\n\n            continue;\n        }\n\n        ear = next;\n\n        // if we looped through the whole remaining polygon and can't find any more ears\n        if (ear === stop) {\n            // try filtering points and slicing again\n            if (!pass) {\n                earcutLinked(filterPoints(ear), triangles, dim, minX, minY, size, 1);\n\n            // if this didn't work, try curing all small self-intersections locally\n            } else if (pass === 1) {\n                ear = cureLocalIntersections(ear, triangles, dim);\n                earcutLinked(ear, triangles, dim, minX, minY, size, 2);\n\n            // as a last resort, try splitting the remaining polygon into two\n            } else if (pass === 2) {\n                splitEarcut(ear, triangles, dim, minX, minY, size);\n            }\n\n            break;\n        }\n    }\n}\n\n// check whether a polygon node forms a valid ear with adjacent nodes\nfunction isEar(ear) {\n    var a = ear.prev,\n        b = ear,\n        c = ear.next;\n\n    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear\n\n    // now make sure we don't have other points inside the potential ear\n    var p = ear.next.next;\n\n    while (p !== ear.prev) {\n        if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&\n            area(p.prev, p, p.next) >= 0) return false;\n        p = p.next;\n    }\n\n    return true;\n}\n\nfunction isEarHashed(ear, minX, minY, size) {\n    var a = ear.prev,\n        b = ear,\n        c = ear.next;\n\n    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear\n\n    // triangle bbox; min & max are calculated like this for speed\n    var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x),\n        minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y),\n        maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x),\n        maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y);\n\n    // z-order range for the current triangle bbox;\n    var minZ = zOrder(minTX, minTY, minX, minY, size),\n        maxZ = zOrder(maxTX, maxTY, minX, minY, size);\n\n    // first look for points inside the triangle in increasing z-order\n    var p = ear.nextZ;\n\n    while (p && p.z <= maxZ) {\n        if (p !== ear.prev && p !== ear.next &&\n            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&\n            area(p.prev, p, p.next) >= 0) return false;\n        p = p.nextZ;\n    }\n\n    // then look for points in decreasing z-order\n    p = ear.prevZ;\n\n    while (p && p.z >= minZ) {\n        if (p !== ear.prev && p !== ear.next &&\n            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&\n            area(p.prev, p, p.next) >= 0) return false;\n        p = p.prevZ;\n    }\n\n    return true;\n}\n\n// go through all polygon nodes and cure small local self-intersections\nfunction cureLocalIntersections(start, triangles, dim) {\n    var p = start;\n    do {\n        var a = p.prev,\n            b = p.next.next;\n\n        if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {\n\n            triangles.push(a.i / dim);\n            triangles.push(p.i / dim);\n            triangles.push(b.i / dim);\n\n            // remove two nodes involved\n            removeNode(p);\n            removeNode(p.next);\n\n            p = start = b;\n        }\n        p = p.next;\n    } while (p !== start);\n\n    return p;\n}\n\n// try splitting polygon into two and triangulate them independently\nfunction splitEarcut(start, triangles, dim, minX, minY, size) {\n    // look for a valid diagonal that divides the polygon into two\n    var a = start;\n    do {\n        var b = a.next.next;\n        while (b !== a.prev) {\n            if (a.i !== b.i && isValidDiagonal(a, b)) {\n                // split the polygon in two by the diagonal\n                var c = splitPolygon(a, b);\n\n                // filter colinear points around the cuts\n                a = filterPoints(a, a.next);\n                c = filterPoints(c, c.next);\n\n                // run earcut on each half\n                earcutLinked(a, triangles, dim, minX, minY, size);\n                earcutLinked(c, triangles, dim, minX, minY, size);\n                return;\n            }\n            b = b.next;\n        }\n        a = a.next;\n    } while (a !== start);\n}\n\n// link every hole into the outer loop, producing a single-ring polygon without holes\nfunction eliminateHoles(data, holeIndices, outerNode, dim) {\n    var queue = [],\n        i, len, start, end, list;\n\n    for (i = 0, len = holeIndices.length; i < len; i++) {\n        start = holeIndices[i] * dim;\n        end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;\n        list = linkedList(data, start, end, dim, false);\n        if (list === list.next) list.steiner = true;\n        queue.push(getLeftmost(list));\n    }\n\n    queue.sort(compareX);\n\n    // process holes from left to right\n    for (i = 0; i < queue.length; i++) {\n        eliminateHole(queue[i], outerNode);\n        outerNode = filterPoints(outerNode, outerNode.next);\n    }\n\n    return outerNode;\n}\n\nfunction compareX(a, b) {\n    return a.x - b.x;\n}\n\n// find a bridge between vertices that connects hole with an outer ring and and link it\nfunction eliminateHole(hole, outerNode) {\n    outerNode = findHoleBridge(hole, outerNode);\n    if (outerNode) {\n        var b = splitPolygon(outerNode, hole);\n        filterPoints(b, b.next);\n    }\n}\n\n// David Eberly's algorithm for finding a bridge between hole and outer polygon\nfunction findHoleBridge(hole, outerNode) {\n    var p = outerNode,\n        hx = hole.x,\n        hy = hole.y,\n        qx = -Infinity,\n        m;\n\n    // find a segment intersected by a ray from the hole's leftmost point to the left;\n    // segment's endpoint with lesser x will be potential connection point\n    do {\n        if (hy <= p.y && hy >= p.next.y) {\n            var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y);\n            if (x <= hx && x > qx) {\n                qx = x;\n                if (x === hx) {\n                    if (hy === p.y) return p;\n                    if (hy === p.next.y) return p.next;\n                }\n                m = p.x < p.next.x ? p : p.next;\n            }\n        }\n        p = p.next;\n    } while (p !== outerNode);\n\n    if (!m) return null;\n\n    if (hx === qx) return m.prev; // hole touches outer segment; pick lower endpoint\n\n    // look for points inside the triangle of hole point, segment intersection and endpoint;\n    // if there are no points found, we have a valid connection;\n    // otherwise choose the point of the minimum angle with the ray as connection point\n\n    var stop = m,\n        mx = m.x,\n        my = m.y,\n        tanMin = Infinity,\n        tan;\n\n    p = m.next;\n\n    while (p !== stop) {\n        if (hx >= p.x && p.x >= mx &&\n                pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {\n\n            tan = Math.abs(hy - p.y) / (hx - p.x); // tangential\n\n            if ((tan < tanMin || (tan === tanMin && p.x > m.x)) && locallyInside(p, hole)) {\n                m = p;\n                tanMin = tan;\n            }\n        }\n\n        p = p.next;\n    }\n\n    return m;\n}\n\n// interlink polygon nodes in z-order\nfunction indexCurve(start, minX, minY, size) {\n    var p = start;\n    do {\n        if (p.z === null) p.z = zOrder(p.x, p.y, minX, minY, size);\n        p.prevZ = p.prev;\n        p.nextZ = p.next;\n        p = p.next;\n    } while (p !== start);\n\n    p.prevZ.nextZ = null;\n    p.prevZ = null;\n\n    sortLinked(p);\n}\n\n// Simon Tatham's linked list merge sort algorithm\n// http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html\nfunction sortLinked(list) {\n    var i, p, q, e, tail, numMerges, pSize, qSize,\n        inSize = 1;\n\n    do {\n        p = list;\n        list = null;\n        tail = null;\n        numMerges = 0;\n\n        while (p) {\n            numMerges++;\n            q = p;\n            pSize = 0;\n            for (i = 0; i < inSize; i++) {\n                pSize++;\n                q = q.nextZ;\n                if (!q) break;\n            }\n\n            qSize = inSize;\n\n            while (pSize > 0 || (qSize > 0 && q)) {\n\n                if (pSize === 0) {\n                    e = q;\n                    q = q.nextZ;\n                    qSize--;\n                } else if (qSize === 0 || !q) {\n                    e = p;\n                    p = p.nextZ;\n                    pSize--;\n                } else if (p.z <= q.z) {\n                    e = p;\n                    p = p.nextZ;\n                    pSize--;\n                } else {\n                    e = q;\n                    q = q.nextZ;\n                    qSize--;\n                }\n\n                if (tail) tail.nextZ = e;\n                else list = e;\n\n                e.prevZ = tail;\n                tail = e;\n            }\n\n            p = q;\n        }\n\n        tail.nextZ = null;\n        inSize *= 2;\n\n    } while (numMerges > 1);\n\n    return list;\n}\n\n// z-order of a point given coords and size of the data bounding box\nfunction zOrder(x, y, minX, minY, size) {\n    // coords are transformed into non-negative 15-bit integer range\n    x = 32767 * (x - minX) / size;\n    y = 32767 * (y - minY) / size;\n\n    x = (x | (x << 8)) & 0x00FF00FF;\n    x = (x | (x << 4)) & 0x0F0F0F0F;\n    x = (x | (x << 2)) & 0x33333333;\n    x = (x | (x << 1)) & 0x55555555;\n\n    y = (y | (y << 8)) & 0x00FF00FF;\n    y = (y | (y << 4)) & 0x0F0F0F0F;\n    y = (y | (y << 2)) & 0x33333333;\n    y = (y | (y << 1)) & 0x55555555;\n\n    return x | (y << 1);\n}\n\n// find the leftmost node of a polygon ring\nfunction getLeftmost(start) {\n    var p = start,\n        leftmost = start;\n    do {\n        if (p.x < leftmost.x) leftmost = p;\n        p = p.next;\n    } while (p !== start);\n\n    return leftmost;\n}\n\n// check if a point lies within a convex triangle\nfunction pointInTriangle(ax, ay, bx, by, cx, cy, px, py) {\n    return (cx - px) * (ay - py) - (ax - px) * (cy - py) >= 0 &&\n           (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 &&\n           (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0;\n}\n\n// check if a diagonal between two polygon nodes is valid (lies in polygon interior)\nfunction isValidDiagonal(a, b) {\n    return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) &&\n           locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b);\n}\n\n// signed area of a triangle\nfunction area(p, q, r) {\n    return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);\n}\n\n// check if two points are equal\nfunction equals(p1, p2) {\n    return p1.x === p2.x && p1.y === p2.y;\n}\n\n// check if two segments intersect\nfunction intersects(p1, q1, p2, q2) {\n    if ((equals(p1, q1) && equals(p2, q2)) ||\n        (equals(p1, q2) && equals(p2, q1))) return true;\n    return area(p1, q1, p2) > 0 !== area(p1, q1, q2) > 0 &&\n           area(p2, q2, p1) > 0 !== area(p2, q2, q1) > 0;\n}\n\n// check if a polygon diagonal intersects any polygon segments\nfunction intersectsPolygon(a, b) {\n    var p = a;\n    do {\n        if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&\n                intersects(p, p.next, a, b)) return true;\n        p = p.next;\n    } while (p !== a);\n\n    return false;\n}\n\n// check if a polygon diagonal is locally inside the polygon\nfunction locallyInside(a, b) {\n    return area(a.prev, a, a.next) < 0 ?\n        area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0 :\n        area(a, b, a.prev) < 0 || area(a, a.next, b) < 0;\n}\n\n// check if the middle point of a polygon diagonal is inside the polygon\nfunction middleInside(a, b) {\n    var p = a,\n        inside = false,\n        px = (a.x + b.x) / 2,\n        py = (a.y + b.y) / 2;\n    do {\n        if (((p.y > py) !== (p.next.y > py)) && (px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x))\n            inside = !inside;\n        p = p.next;\n    } while (p !== a);\n\n    return inside;\n}\n\n// link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;\n// if one belongs to the outer ring and another to a hole, it merges it into a single ring\nfunction splitPolygon(a, b) {\n    var a2 = new Node(a.i, a.x, a.y),\n        b2 = new Node(b.i, b.x, b.y),\n        an = a.next,\n        bp = b.prev;\n\n    a.next = b;\n    b.prev = a;\n\n    a2.next = an;\n    an.prev = a2;\n\n    b2.next = a2;\n    a2.prev = b2;\n\n    bp.next = b2;\n    b2.prev = bp;\n\n    return b2;\n}\n\n// create a node and optionally link it with previous one (in a circular doubly linked list)\nfunction insertNode(i, x, y, last) {\n    var p = new Node(i, x, y);\n\n    if (!last) {\n        p.prev = p;\n        p.next = p;\n\n    } else {\n        p.next = last.next;\n        p.prev = last;\n        last.next.prev = p;\n        last.next = p;\n    }\n    return p;\n}\n\nfunction removeNode(p) {\n    p.next.prev = p.prev;\n    p.prev.next = p.next;\n\n    if (p.prevZ) p.prevZ.nextZ = p.nextZ;\n    if (p.nextZ) p.nextZ.prevZ = p.prevZ;\n}\n\nfunction Node(i, x, y) {\n    // vertice index in coordinates array\n    this.i = i;\n\n    // vertex coordinates\n    this.x = x;\n    this.y = y;\n\n    // previous and next vertice nodes in a polygon ring\n    this.prev = null;\n    this.next = null;\n\n    // z-order curve value\n    this.z = null;\n\n    // previous and next nodes in z-order\n    this.prevZ = null;\n    this.nextZ = null;\n\n    // indicates whether this is a steiner point\n    this.steiner = false;\n}\n\n// return a percentage difference between the polygon area and its triangulation area;\n// used to verify correctness of triangulation\nearcut.deviation = function (data, holeIndices, dim, triangles) {\n    var hasHoles = holeIndices && holeIndices.length;\n    var outerLen = hasHoles ? holeIndices[0] * dim : data.length;\n\n    var polygonArea = Math.abs(signedArea(data, 0, outerLen, dim));\n    if (hasHoles) {\n        for (var i = 0, len = holeIndices.length; i < len; i++) {\n            var start = holeIndices[i] * dim;\n            var end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;\n            polygonArea -= Math.abs(signedArea(data, start, end, dim));\n        }\n    }\n\n    var trianglesArea = 0;\n    for (i = 0; i < triangles.length; i += 3) {\n        var a = triangles[i] * dim;\n        var b = triangles[i + 1] * dim;\n        var c = triangles[i + 2] * dim;\n        trianglesArea += Math.abs(\n            (data[a] - data[c]) * (data[b + 1] - data[a + 1]) -\n            (data[a] - data[b]) * (data[c + 1] - data[a + 1]));\n    }\n\n    return polygonArea === 0 && trianglesArea === 0 ? 0 :\n        Math.abs((trianglesArea - polygonArea) / polygonArea);\n};\n\nfunction signedArea(data, start, end, dim) {\n    var sum = 0;\n    for (var i = start, j = end - dim; i < end; i += dim) {\n        sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);\n        j = i;\n    }\n    return sum;\n}\n\n// turn a polygon in a multi-dimensional array form (e.g. as in GeoJSON) into a form Earcut accepts\nearcut.flatten = function (data) {\n    var dim = data[0][0].length,\n        result = {vertices: [], holes: [], dimensions: dim},\n        holeIndex = 0;\n\n    for (var i = 0; i < data.length; i++) {\n        for (var j = 0; j < data[i].length; j++) {\n            for (var d = 0; d < dim; d++) result.vertices.push(data[i][j][d]);\n        }\n        if (i > 0) {\n            holeIndex += data[i - 1].length;\n            result.holes.push(holeIndex);\n        }\n    }\n    return result;\n};\n",
+    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nfunction EventEmitter() {\n  this._events = this._events || {};\n  this._maxListeners = this._maxListeners || undefined;\n}\nmodule.exports = EventEmitter;\n\n// Backwards-compat with node 0.10.x\nEventEmitter.EventEmitter = EventEmitter;\n\nEventEmitter.prototype._events = undefined;\nEventEmitter.prototype._maxListeners = undefined;\n\n// By default EventEmitters will print a warning if more than 10 listeners are\n// added to it. This is a useful default which helps finding memory leaks.\nEventEmitter.defaultMaxListeners = 10;\n\n// Obviously not all Emitters should be limited to 10. This function allows\n// that to be increased. Set to zero for unlimited.\nEventEmitter.prototype.setMaxListeners = function(n) {\n  if (!isNumber(n) || n < 0 || isNaN(n))\n    throw TypeError('n must be a positive number');\n  this._maxListeners = n;\n  return this;\n};\n\nEventEmitter.prototype.emit = function(type) {\n  var er, handler, len, args, i, listeners;\n\n  if (!this._events)\n    this._events = {};\n\n  // If there is no 'error' event listener then throw.\n  if (type === 'error') {\n    if (!this._events.error ||\n        (isObject(this._events.error) && !this._events.error.length)) {\n      er = arguments[1];\n      if (er instanceof Error) {\n        throw er; // Unhandled 'error' event\n      } else {\n        // At least give some kind of context to the user\n        var err = new Error('Uncaught, unspecified \"error\" event. (' + er + ')');\n        err.context = er;\n        throw err;\n      }\n    }\n  }\n\n  handler = this._events[type];\n\n  if (isUndefined(handler))\n    return false;\n\n  if (isFunction(handler)) {\n    switch (arguments.length) {\n      // fast cases\n      case 1:\n        handler.call(this);\n        break;\n      case 2:\n        handler.call(this, arguments[1]);\n        break;\n      case 3:\n        handler.call(this, arguments[1], arguments[2]);\n        break;\n      // slower\n      default:\n        args = Array.prototype.slice.call(arguments, 1);\n        handler.apply(this, args);\n    }\n  } else if (isObject(handler)) {\n    args = Array.prototype.slice.call(arguments, 1);\n    listeners = handler.slice();\n    len = listeners.length;\n    for (i = 0; i < len; i++)\n      listeners[i].apply(this, args);\n  }\n\n  return true;\n};\n\nEventEmitter.prototype.addListener = function(type, listener) {\n  var m;\n\n  if (!isFunction(listener))\n    throw TypeError('listener must be a function');\n\n  if (!this._events)\n    this._events = {};\n\n  // To avoid recursion in the case that type === \"newListener\"! Before\n  // adding it to the listeners, first emit \"newListener\".\n  if (this._events.newListener)\n    this.emit('newListener', type,\n              isFunction(listener.listener) ?\n              listener.listener : listener);\n\n  if (!this._events[type])\n    // Optimize the case of one listener. Don't need the extra array object.\n    this._events[type] = listener;\n  else if (isObject(this._events[type]))\n    // If we've already got an array, just append.\n    this._events[type].push(listener);\n  else\n    // Adding the second element, need to change to array.\n    this._events[type] = [this._events[type], listener];\n\n  // Check for listener leak\n  if (isObject(this._events[type]) && !this._events[type].warned) {\n    if (!isUndefined(this._maxListeners)) {\n      m = this._maxListeners;\n    } else {\n      m = EventEmitter.defaultMaxListeners;\n    }\n\n    if (m && m > 0 && this._events[type].length > m) {\n      this._events[type].warned = true;\n      console.error('(node) warning: possible EventEmitter memory ' +\n                    'leak detected. %d listeners added. ' +\n                    'Use emitter.setMaxListeners() to increase limit.',\n                    this._events[type].length);\n      if (typeof console.trace === 'function') {\n        // not supported in IE 10\n        console.trace();\n      }\n    }\n  }\n\n  return this;\n};\n\nEventEmitter.prototype.on = EventEmitter.prototype.addListener;\n\nEventEmitter.prototype.once = function(type, listener) {\n  if (!isFunction(listener))\n    throw TypeError('listener must be a function');\n\n  var fired = false;\n\n  function g() {\n    this.removeListener(type, g);\n\n    if (!fired) {\n      fired = true;\n      listener.apply(this, arguments);\n    }\n  }\n\n  g.listener = listener;\n  this.on(type, g);\n\n  return this;\n};\n\n// emits a 'removeListener' event iff the listener was removed\nEventEmitter.prototype.removeListener = function(type, listener) {\n  var list, position, length, i;\n\n  if (!isFunction(listener))\n    throw TypeError('listener must be a function');\n\n  if (!this._events || !this._events[type])\n    return this;\n\n  list = this._events[type];\n  length = list.length;\n  position = -1;\n\n  if (list === listener ||\n      (isFunction(list.listener) && list.listener === listener)) {\n    delete this._events[type];\n    if (this._events.removeListener)\n      this.emit('removeListener', type, listener);\n\n  } else if (isObject(list)) {\n    for (i = length; i-- > 0;) {\n      if (list[i] === listener ||\n          (list[i].listener && list[i].listener === listener)) {\n        position = i;\n        break;\n      }\n    }\n\n    if (position < 0)\n      return this;\n\n    if (list.length === 1) {\n      list.length = 0;\n      delete this._events[type];\n    } else {\n      list.splice(position, 1);\n    }\n\n    if (this._events.removeListener)\n      this.emit('removeListener', type, listener);\n  }\n\n  return this;\n};\n\nEventEmitter.prototype.removeAllListeners = function(type) {\n  var key, listeners;\n\n  if (!this._events)\n    return this;\n\n  // not listening for removeListener, no need to emit\n  if (!this._events.removeListener) {\n    if (arguments.length === 0)\n      this._events = {};\n    else if (this._events[type])\n      delete this._events[type];\n    return this;\n  }\n\n  // emit removeListener for all listeners on all events\n  if (arguments.length === 0) {\n    for (key in this._events) {\n      if (key === 'removeListener') continue;\n      this.removeAllListeners(key);\n    }\n    this.removeAllListeners('removeListener');\n    this._events = {};\n    return this;\n  }\n\n  listeners = this._events[type];\n\n  if (isFunction(listeners)) {\n    this.removeListener(type, listeners);\n  } else if (listeners) {\n    // LIFO order\n    while (listeners.length)\n      this.removeListener(type, listeners[listeners.length - 1]);\n  }\n  delete this._events[type];\n\n  return this;\n};\n\nEventEmitter.prototype.listeners = function(type) {\n  var ret;\n  if (!this._events || !this._events[type])\n    ret = [];\n  else if (isFunction(this._events[type]))\n    ret = [this._events[type]];\n  else\n    ret = this._events[type].slice();\n  return ret;\n};\n\nEventEmitter.prototype.listenerCount = function(type) {\n  if (this._events) {\n    var evlistener = this._events[type];\n\n    if (isFunction(evlistener))\n      return 1;\n    else if (evlistener)\n      return evlistener.length;\n  }\n  return 0;\n};\n\nEventEmitter.listenerCount = function(emitter, type) {\n  return emitter.listenerCount(type);\n};\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\n",
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     "'use strict';\n\nmodule.exports = clip;\n\nvar createFeature = require('./feature');\n\n/* clip features between two axis-parallel lines:\n *     |        |\n *  ___|___     |     /\n * /   |   \\____|____/\n *     |        |\n */\n\nfunction clip(features, scale, k1, k2, axis, intersect, minAll, maxAll) {\n\n    k1 /= scale;\n    k2 /= scale;\n\n    if (minAll >= k1 && maxAll <= k2) return features; // trivial accept\n    else if (minAll > k2 || maxAll < k1) return null; // trivial reject\n\n    var clipped = [];\n\n    for (var i = 0; i < features.length; i++) {\n\n        var feature = features[i],\n            geometry = feature.geometry,\n            type = feature.type,\n            min, max;\n\n        min = feature.min[axis];\n        max = feature.max[axis];\n\n        if (min >= k1 && max <= k2) { // trivial accept\n            clipped.push(feature);\n            continue;\n        } else if (min > k2 || max < k1) continue; // trivial reject\n\n        var slices = type === 1 ?\n                clipPoints(geometry, k1, k2, axis) :\n                clipGeometry(geometry, k1, k2, axis, intersect, type === 3);\n\n        if (slices.length) {\n            // if a feature got clipped, it will likely get clipped on the next zoom level as well,\n            // so there's no need to recalculate bboxes\n            clipped.push(createFeature(feature.tags, type, slices, feature.id));\n        }\n    }\n\n    return clipped.length ? clipped : null;\n}\n\nfunction clipPoints(geometry, k1, k2, axis) {\n    var slice = [];\n\n    for (var i = 0; i < geometry.length; i++) {\n        var a = geometry[i],\n            ak = a[axis];\n\n        if (ak >= k1 && ak <= k2) slice.push(a);\n    }\n    return slice;\n}\n\nfunction clipGeometry(geometry, k1, k2, axis, intersect, closed) {\n\n    var slices = [];\n\n    for (var i = 0; i < geometry.length; i++) {\n\n        var ak = 0,\n            bk = 0,\n            b = null,\n            points = geometry[i],\n            area = points.area,\n            dist = points.dist,\n            outer = points.outer,\n            len = points.length,\n            a, j, last;\n\n        var slice = [];\n\n        for (j = 0; j < len - 1; j++) {\n            a = b || points[j];\n            b = points[j + 1];\n            ak = bk || a[axis];\n            bk = b[axis];\n\n            if (ak < k1) {\n\n                if ((bk > k2)) { // ---|-----|-->\n                    slice.push(intersect(a, b, k1), intersect(a, b, k2));\n                    if (!closed) slice = newSlice(slices, slice, area, dist, outer);\n\n                } else if (bk >= k1) slice.push(intersect(a, b, k1)); // ---|-->  |\n\n            } else if (ak > k2) {\n\n                if ((bk < k1)) { // <--|-----|---\n                    slice.push(intersect(a, b, k2), intersect(a, b, k1));\n                    if (!closed) slice = newSlice(slices, slice, area, dist, outer);\n\n                } else if (bk <= k2) slice.push(intersect(a, b, k2)); // |  <--|---\n\n            } else {\n\n                slice.push(a);\n\n                if (bk < k1) { // <--|---  |\n                    slice.push(intersect(a, b, k1));\n                    if (!closed) slice = newSlice(slices, slice, area, dist, outer);\n\n                } else if (bk > k2) { // |  ---|-->\n                    slice.push(intersect(a, b, k2));\n                    if (!closed) slice = newSlice(slices, slice, area, dist, outer);\n                }\n                // | --> |\n            }\n        }\n\n        // add the last point\n        a = points[len - 1];\n        ak = a[axis];\n        if (ak >= k1 && ak <= k2) slice.push(a);\n\n        // close the polygon if its endpoints are not the same after clipping\n\n        last = slice[slice.length - 1];\n        if (closed && last && (slice[0][0] !== last[0] || slice[0][1] !== last[1])) slice.push(slice[0]);\n\n        // add the final slice\n        newSlice(slices, slice, area, dist, outer);\n    }\n\n    return slices;\n}\n\nfunction newSlice(slices, slice, area, dist, outer) {\n    if (slice.length) {\n        // we don't recalculate the area/length of the unclipped geometry because the case where it goes\n        // below the visibility threshold as a result of clipping is rare, so we avoid doing unnecessary work\n        slice.area = area;\n        slice.dist = dist;\n        if (outer !== undefined) slice.outer = outer;\n\n        slices.push(slice);\n    }\n    return [];\n}\n",
     "'use strict';\n\nmodule.exports = convert;\n\nvar simplify = require('./simplify');\nvar createFeature = require('./feature');\n\n// converts GeoJSON feature into an intermediate projected JSON vector format with simplification data\n\nfunction convert(data, tolerance) {\n    var features = [];\n\n    if (data.type === 'FeatureCollection') {\n        for (var i = 0; i < data.features.length; i++) {\n            convertFeature(features, data.features[i], tolerance);\n        }\n    } else if (data.type === 'Feature') {\n        convertFeature(features, data, tolerance);\n\n    } else {\n        // single geometry or a geometry collection\n        convertFeature(features, {geometry: data}, tolerance);\n    }\n    return features;\n}\n\nfunction convertFeature(features, feature, tolerance) {\n    if (feature.geometry === null) {\n        // ignore features with null geometry\n        return;\n    }\n\n    var geom = feature.geometry,\n        type = geom.type,\n        coords = geom.coordinates,\n        tags = feature.properties,\n        id = feature.id,\n        i, j, rings, projectedRing;\n\n    if (type === 'Point') {\n        features.push(createFeature(tags, 1, [projectPoint(coords)], id));\n\n    } else if (type === 'MultiPoint') {\n        features.push(createFeature(tags, 1, project(coords), id));\n\n    } else if (type === 'LineString') {\n        features.push(createFeature(tags, 2, [project(coords, tolerance)], id));\n\n    } else if (type === 'MultiLineString' || type === 'Polygon') {\n        rings = [];\n        for (i = 0; i < coords.length; i++) {\n            projectedRing = project(coords[i], tolerance);\n            if (type === 'Polygon') projectedRing.outer = (i === 0);\n            rings.push(projectedRing);\n        }\n        features.push(createFeature(tags, type === 'Polygon' ? 3 : 2, rings, id));\n\n    } else if (type === 'MultiPolygon') {\n        rings = [];\n        for (i = 0; i < coords.length; i++) {\n            for (j = 0; j < coords[i].length; j++) {\n                projectedRing = project(coords[i][j], tolerance);\n                projectedRing.outer = (j === 0);\n                rings.push(projectedRing);\n            }\n        }\n        features.push(createFeature(tags, 3, rings, id));\n\n    } else if (type === 'GeometryCollection') {\n        for (i = 0; i < geom.geometries.length; i++) {\n            convertFeature(features, {\n                geometry: geom.geometries[i],\n                properties: tags\n            }, tolerance);\n        }\n\n    } else {\n        throw new Error('Input data is not a valid GeoJSON object.');\n    }\n}\n\nfunction project(lonlats, tolerance) {\n    var projected = [];\n    for (var i = 0; i < lonlats.length; i++) {\n        projected.push(projectPoint(lonlats[i]));\n    }\n    if (tolerance) {\n        simplify(projected, tolerance);\n        calcSize(projected);\n    }\n    return projected;\n}\n\nfunction projectPoint(p) {\n    var sin = Math.sin(p[1] * Math.PI / 180),\n        x = (p[0] / 360 + 0.5),\n        y = (0.5 - 0.25 * Math.log((1 + sin) / (1 - sin)) / Math.PI);\n\n    y = y < 0 ? 0 :\n        y > 1 ? 1 : y;\n\n    return [x, y, 0];\n}\n\n// calculate area and length of the poly\nfunction calcSize(points) {\n    var area = 0,\n        dist = 0;\n\n    for (var i = 0, a, b; i < points.length - 1; i++) {\n        a = b || points[i];\n        b = points[i + 1];\n\n        area += a[0] * b[1] - b[0] * a[1];\n\n        // use Manhattan distance instead of Euclidian one to avoid expensive square root computation\n        dist += Math.abs(b[0] - a[0]) + Math.abs(b[1] - a[1]);\n    }\n    points.area = Math.abs(area / 2);\n    points.dist = dist;\n}\n",
@@ -375,6 +371,10 @@
     "module.exports = scale;\n\n/**\n * Scales the mat4 by the dimensions in the given vec3\n *\n * @param {mat4} out the receiving matrix\n * @param {mat4} a the matrix to scale\n * @param {vec3} v the vec3 to scale the matrix by\n * @returns {mat4} out\n **/\nfunction scale(out, a, v) {\n    var x = v[0], y = v[1], z = v[2];\n\n    out[0] = a[0] * x;\n    out[1] = a[1] * x;\n    out[2] = a[2] * x;\n    out[3] = a[3] * x;\n    out[4] = a[4] * y;\n    out[5] = a[5] * y;\n    out[6] = a[6] * y;\n    out[7] = a[7] * y;\n    out[8] = a[8] * z;\n    out[9] = a[9] * z;\n    out[10] = a[10] * z;\n    out[11] = a[11] * z;\n    out[12] = a[12];\n    out[13] = a[13];\n    out[14] = a[14];\n    out[15] = a[15];\n    return out;\n};",
     "module.exports = translate;\n\n/**\n * Translate a mat4 by the given vector\n *\n * @param {mat4} out the receiving matrix\n * @param {mat4} a the matrix to translate\n * @param {vec3} v vector to translate by\n * @returns {mat4} out\n */\nfunction translate(out, a, v) {\n    var x = v[0], y = v[1], z = v[2],\n        a00, a01, a02, a03,\n        a10, a11, a12, a13,\n        a20, a21, a22, a23;\n\n    if (a === out) {\n        out[12] = a[0] * x + a[4] * y + a[8] * z + a[12];\n        out[13] = a[1] * x + a[5] * y + a[9] * z + a[13];\n        out[14] = a[2] * x + a[6] * y + a[10] * z + a[14];\n        out[15] = a[3] * x + a[7] * y + a[11] * z + a[15];\n    } else {\n        a00 = a[0]; a01 = a[1]; a02 = a[2]; a03 = a[3];\n        a10 = a[4]; a11 = a[5]; a12 = a[6]; a13 = a[7];\n        a20 = a[8]; a21 = a[9]; a22 = a[10]; a23 = a[11];\n\n        out[0] = a00; out[1] = a01; out[2] = a02; out[3] = a03;\n        out[4] = a10; out[5] = a11; out[6] = a12; out[7] = a13;\n        out[8] = a20; out[9] = a21; out[10] = a22; out[11] = a23;\n\n        out[12] = a00 * x + a10 * y + a20 * z + a[12];\n        out[13] = a01 * x + a11 * y + a21 * z + a[13];\n        out[14] = a02 * x + a12 * y + a22 * z + a[14];\n        out[15] = a03 * x + a13 * y + a23 * z + a[15];\n    }\n\n    return out;\n};",
     "module.exports = parseErrors\n\nfunction parseErrors(log) {\n  log = String(log)\n\n  var logs = []\n  var result\n\n  while (result = log.match(/ERROR\\:([^\\n]+)/)) {\n    log = log.slice(result.index + 1)\n\n    var line = result[1].trim()\n    var seps = line.split(':')\n    var emsg = seps.slice(2).join(':').trim()\n    var file = parseInt(seps[0], 10)\n    var line = parseInt(seps[1], 10)\n\n    logs.push({\n        message: emsg\n      , file: file\n      , line: line\n    })\n  }\n\n  return logs\n}\n",
+    "exports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = nBytes * 8 - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = nBytes * 8 - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = (value * c - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n",
+    "if (typeof Object.create === 'function') {\n  // implementation from standard node.js 'util' module\n  module.exports = function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor\n    ctor.prototype = Object.create(superCtor.prototype, {\n      constructor: {\n        value: ctor,\n        enumerable: false,\n        writable: true,\n        configurable: true\n      }\n    });\n  };\n} else {\n  // old school shim for old browsers\n  module.exports = function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor\n    var TempCtor = function () {}\n    TempCtor.prototype = superCtor.prototype\n    ctor.prototype = new TempCtor()\n    ctor.prototype.constructor = ctor\n  }\n}\n",
+    "/*!\n * Determine if an object is a Buffer\n *\n * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>\n * @license  MIT\n */\n\n// The _isBuffer check is for Safari 5-7 support, because it's missing\n// Object.prototype.constructor. Remove this eventually\nmodule.exports = function (obj) {\n  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)\n}\n\nfunction isBuffer (obj) {\n  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)\n}\n\n// For Node v0.10 support. Remove this eventually.\nfunction isSlowBuffer (obj) {\n  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))\n}\n",
+    "var toString = {}.toString;\n\nmodule.exports = Array.isArray || function (arr) {\n  return toString.call(arr) == '[object Array]';\n};\n",
     "'use strict';\n\n\nvar yaml = require('./lib/js-yaml.js');\n\n\nmodule.exports = yaml;\n",
     "'use strict';\n\n\nvar loader = require('./js-yaml/loader');\n// var dumper = require('./js-yaml/dumper');\n\n\nfunction deprecated(name) {\n  return function () {\n    throw new Error('Function ' + name + ' is deprecated and cannot be used.');\n  };\n}\n\n\nmodule.exports.Type                = require('./js-yaml/type');\nmodule.exports.Schema              = require('./js-yaml/schema');\nmodule.exports.FAILSAFE_SCHEMA     = require('./js-yaml/schema/failsafe');\nmodule.exports.JSON_SCHEMA         = require('./js-yaml/schema/json');\nmodule.exports.CORE_SCHEMA         = require('./js-yaml/schema/core');\nmodule.exports.DEFAULT_SAFE_SCHEMA = require('./js-yaml/schema/default_safe');\nmodule.exports.DEFAULT_FULL_SCHEMA = require('./js-yaml/schema/default_full');\nmodule.exports.load                = loader.load;\nmodule.exports.loadAll             = loader.loadAll;\nmodule.exports.safeLoad            = loader.safeLoad;\nmodule.exports.safeLoadAll         = loader.safeLoadAll;\n// module.exports.dump                = dumper.dump;\n// module.exports.safeDump            = dumper.safeDump;\nmodule.exports.YAMLException       = require('./js-yaml/exception');\n\n// Deprecated schema names from JS-YAML 2.0.x\nmodule.exports.MINIMAL_SCHEMA = require('./js-yaml/schema/failsafe');\nmodule.exports.SAFE_SCHEMA    = require('./js-yaml/schema/default_safe');\nmodule.exports.DEFAULT_SCHEMA = require('./js-yaml/schema/default_full');\n\n// Deprecated functions from JS-YAML 1.x.x\nmodule.exports.scan           = deprecated('scan');\nmodule.exports.parse          = deprecated('parse');\nmodule.exports.compose        = deprecated('compose');\nmodule.exports.addConstructor = deprecated('addConstructor');\n",
     "'use strict';\n\n\nfunction isNothing(subject) {\n  return (typeof subject === 'undefined') || (subject === null);\n}\n\n\nfunction isObject(subject) {\n  return (typeof subject === 'object') && (subject !== null);\n}\n\n\nfunction toArray(sequence) {\n  if (Array.isArray(sequence)) return sequence;\n  else if (isNothing(sequence)) return [];\n\n  return [ sequence ];\n}\n\n\nfunction extend(target, source) {\n  var index, length, key, sourceKeys;\n\n  if (source) {\n    sourceKeys = Object.keys(source);\n\n    for (index = 0, length = sourceKeys.length; index < length; index += 1) {\n      key = sourceKeys[index];\n      target[key] = source[key];\n    }\n  }\n\n  return target;\n}\n\n\nfunction repeat(string, count) {\n  var result = '', cycle;\n\n  for (cycle = 0; cycle < count; cycle += 1) {\n    result += string;\n  }\n\n  return result;\n}\n\n\nfunction isNegativeZero(number) {\n  return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);\n}\n\n\nmodule.exports.isNothing      = isNothing;\nmodule.exports.isObject       = isObject;\nmodule.exports.toArray        = toArray;\nmodule.exports.repeat         = repeat;\nmodule.exports.isNegativeZero = isNegativeZero;\nmodule.exports.extend         = extend;\n",
@@ -436,11 +436,15 @@
     "'use strict';\nvar readerFor = require('./reader/readerFor');\nvar utils = require('./utils');\nvar sig = require('./signature');\nvar ZipEntry = require('./zipEntry');\nvar utf8 = require('./utf8');\nvar support = require('./support');\n//  class ZipEntries {{{\n/**\n * All the entries in the zip file.\n * @constructor\n * @param {Object} loadOptions Options for loading the stream.\n */\nfunction ZipEntries(loadOptions) {\n    this.files = [];\n    this.loadOptions = loadOptions;\n}\nZipEntries.prototype = {\n    /**\n     * Check that the reader is on the speficied signature.\n     * @param {string} expectedSignature the expected signature.\n     * @throws {Error} if it is an other signature.\n     */\n    checkSignature: function(expectedSignature) {\n        if (!this.reader.readAndCheckSignature(expectedSignature)) {\n            this.reader.index -= 4;\n            var signature = this.reader.readString(4);\n            throw new Error(\"Corrupted zip or bug : unexpected signature \" + \"(\" + utils.pretty(signature) + \", expected \" + utils.pretty(expectedSignature) + \")\");\n        }\n    },\n    /**\n     * Check if the given signature is at the given index.\n     * @param {number} askedIndex the index to check.\n     * @param {string} expectedSignature the signature to expect.\n     * @return {boolean} true if the signature is here, false otherwise.\n     */\n    isSignature: function(askedIndex, expectedSignature) {\n        var currentIndex = this.reader.index;\n        this.reader.setIndex(askedIndex);\n        var signature = this.reader.readString(4);\n        var result = signature === expectedSignature;\n        this.reader.setIndex(currentIndex);\n        return result;\n    },\n    /**\n     * Read the end of the central directory.\n     */\n    readBlockEndOfCentral: function() {\n        this.diskNumber = this.reader.readInt(2);\n        this.diskWithCentralDirStart = this.reader.readInt(2);\n        this.centralDirRecordsOnThisDisk = this.reader.readInt(2);\n        this.centralDirRecords = this.reader.readInt(2);\n        this.centralDirSize = this.reader.readInt(4);\n        this.centralDirOffset = this.reader.readInt(4);\n\n        this.zipCommentLength = this.reader.readInt(2);\n        // warning : the encoding depends of the system locale\n        // On a linux machine with LANG=en_US.utf8, this field is utf8 encoded.\n        // On a windows machine, this field is encoded with the localized windows code page.\n        var zipComment = this.reader.readData(this.zipCommentLength);\n        var decodeParamType = support.uint8array ? \"uint8array\" : \"array\";\n        // To get consistent behavior with the generation part, we will assume that\n        // this is utf8 encoded unless specified otherwise.\n        var decodeContent = utils.transformTo(decodeParamType, zipComment);\n        this.zipComment = this.loadOptions.decodeFileName(decodeContent);\n    },\n    /**\n     * Read the end of the Zip 64 central directory.\n     * Not merged with the method readEndOfCentral :\n     * The end of central can coexist with its Zip64 brother,\n     * I don't want to read the wrong number of bytes !\n     */\n    readBlockZip64EndOfCentral: function() {\n        this.zip64EndOfCentralSize = this.reader.readInt(8);\n        this.reader.skip(4);\n        // this.versionMadeBy = this.reader.readString(2);\n        // this.versionNeeded = this.reader.readInt(2);\n        this.diskNumber = this.reader.readInt(4);\n        this.diskWithCentralDirStart = this.reader.readInt(4);\n        this.centralDirRecordsOnThisDisk = this.reader.readInt(8);\n        this.centralDirRecords = this.reader.readInt(8);\n        this.centralDirSize = this.reader.readInt(8);\n        this.centralDirOffset = this.reader.readInt(8);\n\n        this.zip64ExtensibleData = {};\n        var extraDataSize = this.zip64EndOfCentralSize - 44,\n            index = 0,\n            extraFieldId,\n            extraFieldLength,\n            extraFieldValue;\n        while (index < extraDataSize) {\n            extraFieldId = this.reader.readInt(2);\n            extraFieldLength = this.reader.readInt(4);\n            extraFieldValue = this.reader.readData(extraFieldLength);\n            this.zip64ExtensibleData[extraFieldId] = {\n                id: extraFieldId,\n                length: extraFieldLength,\n                value: extraFieldValue\n            };\n        }\n    },\n    /**\n     * Read the end of the Zip 64 central directory locator.\n     */\n    readBlockZip64EndOfCentralLocator: function() {\n        this.diskWithZip64CentralDirStart = this.reader.readInt(4);\n        this.relativeOffsetEndOfZip64CentralDir = this.reader.readInt(8);\n        this.disksCount = this.reader.readInt(4);\n        if (this.disksCount > 1) {\n            throw new Error(\"Multi-volumes zip are not supported\");\n        }\n    },\n    /**\n     * Read the local files, based on the offset read in the central part.\n     */\n    readLocalFiles: function() {\n        var i, file;\n        for (i = 0; i < this.files.length; i++) {\n            file = this.files[i];\n            this.reader.setIndex(file.localHeaderOffset);\n            this.checkSignature(sig.LOCAL_FILE_HEADER);\n            file.readLocalPart(this.reader);\n            file.handleUTF8();\n            file.processAttributes();\n        }\n    },\n    /**\n     * Read the central directory.\n     */\n    readCentralDir: function() {\n        var file;\n\n        this.reader.setIndex(this.centralDirOffset);\n        while (this.reader.readAndCheckSignature(sig.CENTRAL_FILE_HEADER)) {\n            file = new ZipEntry({\n                zip64: this.zip64\n            }, this.loadOptions);\n            file.readCentralPart(this.reader);\n            this.files.push(file);\n        }\n\n        if (this.centralDirRecords !== this.files.length) {\n            if (this.centralDirRecords !== 0 && this.files.length === 0) {\n                // We expected some records but couldn't find ANY.\n                // This is really suspicious, as if something went wrong.\n                throw new Error(\"Corrupted zip or bug: expected \" + this.centralDirRecords + \" records in central dir, got \" + this.files.length);\n            } else {\n                // We found some records but not all.\n                // Something is wrong but we got something for the user: no error here.\n                // console.warn(\"expected\", this.centralDirRecords, \"records in central dir, got\", this.files.length);\n            }\n        }\n    },\n    /**\n     * Read the end of central directory.\n     */\n    readEndOfCentral: function() {\n        var offset = this.reader.lastIndexOfSignature(sig.CENTRAL_DIRECTORY_END);\n        if (offset < 0) {\n            // Check if the content is a truncated zip or complete garbage.\n            // A \"LOCAL_FILE_HEADER\" is not required at the beginning (auto\n            // extractible zip for example) but it can give a good hint.\n            // If an ajax request was used without responseType, we will also\n            // get unreadable data.\n            var isGarbage = !this.isSignature(0, sig.LOCAL_FILE_HEADER);\n\n            if (isGarbage) {\n                throw new Error(\"Can't find end of central directory : is this a zip file ? \" +\n                                \"If it is, see http://stuk.github.io/jszip/documentation/howto/read_zip.html\");\n            } else {\n                throw new Error(\"Corrupted zip : can't find end of central directory\");\n            }\n\n        }\n        this.reader.setIndex(offset);\n        var endOfCentralDirOffset = offset;\n        this.checkSignature(sig.CENTRAL_DIRECTORY_END);\n        this.readBlockEndOfCentral();\n\n\n        /* extract from the zip spec :\n            4)  If one of the fields in the end of central directory\n                record is too small to hold required data, the field\n                should be set to -1 (0xFFFF or 0xFFFFFFFF) and the\n                ZIP64 format record should be created.\n            5)  The end of central directory record and the\n                Zip64 end of central directory locator record must\n                reside on the same disk when splitting or spanning\n                an archive.\n         */\n        if (this.diskNumber === utils.MAX_VALUE_16BITS || this.diskWithCentralDirStart === utils.MAX_VALUE_16BITS || this.centralDirRecordsOnThisDisk === utils.MAX_VALUE_16BITS || this.centralDirRecords === utils.MAX_VALUE_16BITS || this.centralDirSize === utils.MAX_VALUE_32BITS || this.centralDirOffset === utils.MAX_VALUE_32BITS) {\n            this.zip64 = true;\n\n            /*\n            Warning : the zip64 extension is supported, but ONLY if the 64bits integer read from\n            the zip file can fit into a 32bits integer. This cannot be solved : Javascript represents\n            all numbers as 64-bit double precision IEEE 754 floating point numbers.\n            So, we have 53bits for integers and bitwise operations treat everything as 32bits.\n            see https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/Bitwise_Operators\n            and http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf section 8.5\n            */\n\n            // should look for a zip64 EOCD locator\n            offset = this.reader.lastIndexOfSignature(sig.ZIP64_CENTRAL_DIRECTORY_LOCATOR);\n            if (offset < 0) {\n                throw new Error(\"Corrupted zip : can't find the ZIP64 end of central directory locator\");\n            }\n            this.reader.setIndex(offset);\n            this.checkSignature(sig.ZIP64_CENTRAL_DIRECTORY_LOCATOR);\n            this.readBlockZip64EndOfCentralLocator();\n\n            // now the zip64 EOCD record\n            if (!this.isSignature(this.relativeOffsetEndOfZip64CentralDir, sig.ZIP64_CENTRAL_DIRECTORY_END)) {\n                // console.warn(\"ZIP64 end of central directory not where expected.\");\n                this.relativeOffsetEndOfZip64CentralDir = this.reader.lastIndexOfSignature(sig.ZIP64_CENTRAL_DIRECTORY_END);\n                if (this.relativeOffsetEndOfZip64CentralDir < 0) {\n                    throw new Error(\"Corrupted zip : can't find the ZIP64 end of central directory\");\n                }\n            }\n            this.reader.setIndex(this.relativeOffsetEndOfZip64CentralDir);\n            this.checkSignature(sig.ZIP64_CENTRAL_DIRECTORY_END);\n            this.readBlockZip64EndOfCentral();\n        }\n\n        var expectedEndOfCentralDirOffset = this.centralDirOffset + this.centralDirSize;\n        if (this.zip64) {\n            expectedEndOfCentralDirOffset += 20; // end of central dir 64 locator\n            expectedEndOfCentralDirOffset += 12 /* should not include the leading 12 bytes */ + this.zip64EndOfCentralSize;\n        }\n\n        var extraBytes = endOfCentralDirOffset - expectedEndOfCentralDirOffset;\n\n        if (extraBytes > 0) {\n            // console.warn(extraBytes, \"extra bytes at beginning or within zipfile\");\n            if (this.isSignature(endOfCentralDirOffset, sig.CENTRAL_FILE_HEADER)) {\n                // The offsets seem wrong, but we have something at the specified offset.\n                // So… we keep it.\n            } else {\n                // the offset is wrong, update the \"zero\" of the reader\n                // this happens if data has been prepended (crx files for example)\n                this.reader.zero = extraBytes;\n            }\n        } else if (extraBytes < 0) {\n            throw new Error(\"Corrupted zip: missing \" + Math.abs(extraBytes) + \" bytes.\");\n        }\n    },\n    prepareReader: function(data) {\n        this.reader = readerFor(data);\n    },\n    /**\n     * Read a zip file and create ZipEntries.\n     * @param {String|ArrayBuffer|Uint8Array|Buffer} data the binary string representing a zip file.\n     */\n    load: function(data) {\n        this.prepareReader(data);\n        this.readEndOfCentral();\n        this.readCentralDir();\n        this.readLocalFiles();\n    }\n};\n// }}} end of ZipEntries\nmodule.exports = ZipEntries;\n",
     "'use strict';\nvar readerFor = require('./reader/readerFor');\nvar utils = require('./utils');\nvar CompressedObject = require('./compressedObject');\nvar crc32fn = require('./crc32');\nvar utf8 = require('./utf8');\nvar compressions = require('./compressions');\nvar support = require('./support');\n\nvar MADE_BY_DOS = 0x00;\nvar MADE_BY_UNIX = 0x03;\n\n/**\n * Find a compression registered in JSZip.\n * @param {string} compressionMethod the method magic to find.\n * @return {Object|null} the JSZip compression object, null if none found.\n */\nvar findCompression = function(compressionMethod) {\n    for (var method in compressions) {\n        if (!compressions.hasOwnProperty(method)) {\n            continue;\n        }\n        if (compressions[method].magic === compressionMethod) {\n            return compressions[method];\n        }\n    }\n    return null;\n};\n\n// class ZipEntry {{{\n/**\n * An entry in the zip file.\n * @constructor\n * @param {Object} options Options of the current file.\n * @param {Object} loadOptions Options for loading the stream.\n */\nfunction ZipEntry(options, loadOptions) {\n    this.options = options;\n    this.loadOptions = loadOptions;\n}\nZipEntry.prototype = {\n    /**\n     * say if the file is encrypted.\n     * @return {boolean} true if the file is encrypted, false otherwise.\n     */\n    isEncrypted: function() {\n        // bit 1 is set\n        return (this.bitFlag & 0x0001) === 0x0001;\n    },\n    /**\n     * say if the file has utf-8 filename/comment.\n     * @return {boolean} true if the filename/comment is in utf-8, false otherwise.\n     */\n    useUTF8: function() {\n        // bit 11 is set\n        return (this.bitFlag & 0x0800) === 0x0800;\n    },\n    /**\n     * Read the local part of a zip file and add the info in this object.\n     * @param {DataReader} reader the reader to use.\n     */\n    readLocalPart: function(reader) {\n        var compression, localExtraFieldsLength;\n\n        // we already know everything from the central dir !\n        // If the central dir data are false, we are doomed.\n        // On the bright side, the local part is scary  : zip64, data descriptors, both, etc.\n        // The less data we get here, the more reliable this should be.\n        // Let's skip the whole header and dash to the data !\n        reader.skip(22);\n        // in some zip created on windows, the filename stored in the central dir contains \\ instead of /.\n        // Strangely, the filename here is OK.\n        // I would love to treat these zip files as corrupted (see http://www.info-zip.org/FAQ.html#backslashes\n        // or APPNOTE#4.4.17.1, \"All slashes MUST be forward slashes '/'\") but there are a lot of bad zip generators...\n        // Search \"unzip mismatching \"local\" filename continuing with \"central\" filename version\" on\n        // the internet.\n        //\n        // I think I see the logic here : the central directory is used to display\n        // content and the local directory is used to extract the files. Mixing / and \\\n        // may be used to display \\ to windows users and use / when extracting the files.\n        // Unfortunately, this lead also to some issues : http://seclists.org/fulldisclosure/2009/Sep/394\n        this.fileNameLength = reader.readInt(2);\n        localExtraFieldsLength = reader.readInt(2); // can't be sure this will be the same as the central dir\n        // the fileName is stored as binary data, the handleUTF8 method will take care of the encoding.\n        this.fileName = reader.readData(this.fileNameLength);\n        reader.skip(localExtraFieldsLength);\n\n        if (this.compressedSize === -1 || this.uncompressedSize === -1) {\n            throw new Error(\"Bug or corrupted zip : didn't get enough informations from the central directory \" + \"(compressedSize === -1 || uncompressedSize === -1)\");\n        }\n\n        compression = findCompression(this.compressionMethod);\n        if (compression === null) { // no compression found\n            throw new Error(\"Corrupted zip : compression \" + utils.pretty(this.compressionMethod) + \" unknown (inner file : \" + utils.transformTo(\"string\", this.fileName) + \")\");\n        }\n        this.decompressed = new CompressedObject(this.compressedSize, this.uncompressedSize, this.crc32, compression, reader.readData(this.compressedSize));\n    },\n\n    /**\n     * Read the central part of a zip file and add the info in this object.\n     * @param {DataReader} reader the reader to use.\n     */\n    readCentralPart: function(reader) {\n        this.versionMadeBy = reader.readInt(2);\n        reader.skip(2);\n        // this.versionNeeded = reader.readInt(2);\n        this.bitFlag = reader.readInt(2);\n        this.compressionMethod = reader.readString(2);\n        this.date = reader.readDate();\n        this.crc32 = reader.readInt(4);\n        this.compressedSize = reader.readInt(4);\n        this.uncompressedSize = reader.readInt(4);\n        var fileNameLength = reader.readInt(2);\n        this.extraFieldsLength = reader.readInt(2);\n        this.fileCommentLength = reader.readInt(2);\n        this.diskNumberStart = reader.readInt(2);\n        this.internalFileAttributes = reader.readInt(2);\n        this.externalFileAttributes = reader.readInt(4);\n        this.localHeaderOffset = reader.readInt(4);\n\n        if (this.isEncrypted()) {\n            throw new Error(\"Encrypted zip are not supported\");\n        }\n\n        // will be read in the local part, see the comments there\n        reader.skip(fileNameLength);\n        this.readExtraFields(reader);\n        this.parseZIP64ExtraField(reader);\n        this.fileComment = reader.readData(this.fileCommentLength);\n    },\n\n    /**\n     * Parse the external file attributes and get the unix/dos permissions.\n     */\n    processAttributes: function () {\n        this.unixPermissions = null;\n        this.dosPermissions = null;\n        var madeBy = this.versionMadeBy >> 8;\n\n        // Check if we have the DOS directory flag set.\n        // We look for it in the DOS and UNIX permissions\n        // but some unknown platform could set it as a compatibility flag.\n        this.dir = this.externalFileAttributes & 0x0010 ? true : false;\n\n        if(madeBy === MADE_BY_DOS) {\n            // first 6 bits (0 to 5)\n            this.dosPermissions = this.externalFileAttributes & 0x3F;\n        }\n\n        if(madeBy === MADE_BY_UNIX) {\n            this.unixPermissions = (this.externalFileAttributes >> 16) & 0xFFFF;\n            // the octal permissions are in (this.unixPermissions & 0x01FF).toString(8);\n        }\n\n        // fail safe : if the name ends with a / it probably means a folder\n        if (!this.dir && this.fileNameStr.slice(-1) === '/') {\n            this.dir = true;\n        }\n    },\n\n    /**\n     * Parse the ZIP64 extra field and merge the info in the current ZipEntry.\n     * @param {DataReader} reader the reader to use.\n     */\n    parseZIP64ExtraField: function(reader) {\n\n        if (!this.extraFields[0x0001]) {\n            return;\n        }\n\n        // should be something, preparing the extra reader\n        var extraReader = readerFor(this.extraFields[0x0001].value);\n\n        // I really hope that these 64bits integer can fit in 32 bits integer, because js\n        // won't let us have more.\n        if (this.uncompressedSize === utils.MAX_VALUE_32BITS) {\n            this.uncompressedSize = extraReader.readInt(8);\n        }\n        if (this.compressedSize === utils.MAX_VALUE_32BITS) {\n            this.compressedSize = extraReader.readInt(8);\n        }\n        if (this.localHeaderOffset === utils.MAX_VALUE_32BITS) {\n            this.localHeaderOffset = extraReader.readInt(8);\n        }\n        if (this.diskNumberStart === utils.MAX_VALUE_32BITS) {\n            this.diskNumberStart = extraReader.readInt(4);\n        }\n    },\n    /**\n     * Read the central part of a zip file and add the info in this object.\n     * @param {DataReader} reader the reader to use.\n     */\n    readExtraFields: function(reader) {\n        var end = reader.index + this.extraFieldsLength,\n            extraFieldId,\n            extraFieldLength,\n            extraFieldValue;\n\n        if (!this.extraFields) {\n            this.extraFields = {};\n        }\n\n        while (reader.index < end) {\n            extraFieldId = reader.readInt(2);\n            extraFieldLength = reader.readInt(2);\n            extraFieldValue = reader.readData(extraFieldLength);\n\n            this.extraFields[extraFieldId] = {\n                id: extraFieldId,\n                length: extraFieldLength,\n                value: extraFieldValue\n            };\n        }\n    },\n    /**\n     * Apply an UTF8 transformation if needed.\n     */\n    handleUTF8: function() {\n        var decodeParamType = support.uint8array ? \"uint8array\" : \"array\";\n        if (this.useUTF8()) {\n            this.fileNameStr = utf8.utf8decode(this.fileName);\n            this.fileCommentStr = utf8.utf8decode(this.fileComment);\n        } else {\n            var upath = this.findExtraFieldUnicodePath();\n            if (upath !== null) {\n                this.fileNameStr = upath;\n            } else {\n                // ASCII text or unsupported code page\n                var fileNameByteArray =  utils.transformTo(decodeParamType, this.fileName);\n                this.fileNameStr = this.loadOptions.decodeFileName(fileNameByteArray);\n            }\n\n            var ucomment = this.findExtraFieldUnicodeComment();\n            if (ucomment !== null) {\n                this.fileCommentStr = ucomment;\n            } else {\n                // ASCII text or unsupported code page\n                var commentByteArray =  utils.transformTo(decodeParamType, this.fileComment);\n                this.fileCommentStr = this.loadOptions.decodeFileName(commentByteArray);\n            }\n        }\n    },\n\n    /**\n     * Find the unicode path declared in the extra field, if any.\n     * @return {String} the unicode path, null otherwise.\n     */\n    findExtraFieldUnicodePath: function() {\n        var upathField = this.extraFields[0x7075];\n        if (upathField) {\n            var extraReader = readerFor(upathField.value);\n\n            // wrong version\n            if (extraReader.readInt(1) !== 1) {\n                return null;\n            }\n\n            // the crc of the filename changed, this field is out of date.\n            if (crc32fn(this.fileName) !== extraReader.readInt(4)) {\n                return null;\n            }\n\n            return utf8.utf8decode(extraReader.readData(upathField.length - 5));\n        }\n        return null;\n    },\n\n    /**\n     * Find the unicode comment declared in the extra field, if any.\n     * @return {String} the unicode comment, null otherwise.\n     */\n    findExtraFieldUnicodeComment: function() {\n        var ucommentField = this.extraFields[0x6375];\n        if (ucommentField) {\n            var extraReader = readerFor(ucommentField.value);\n\n            // wrong version\n            if (extraReader.readInt(1) !== 1) {\n                return null;\n            }\n\n            // the crc of the comment changed, this field is out of date.\n            if (crc32fn(this.fileComment) !== extraReader.readInt(4)) {\n                return null;\n            }\n\n            return utf8.utf8decode(extraReader.readData(ucommentField.length - 5));\n        }\n        return null;\n    }\n};\nmodule.exports = ZipEntry;\n",
     "'use strict';\n\nvar StreamHelper = require('./stream/StreamHelper');\nvar DataWorker = require('./stream/DataWorker');\nvar utf8 = require('./utf8');\nvar CompressedObject = require('./compressedObject');\nvar GenericWorker = require('./stream/GenericWorker');\n\n/**\n * A simple object representing a file in the zip file.\n * @constructor\n * @param {string} name the name of the file\n * @param {String|ArrayBuffer|Uint8Array|Buffer} data the data\n * @param {Object} options the options of the file\n */\nvar ZipObject = function(name, data, options) {\n    this.name = name;\n    this.dir = options.dir;\n    this.date = options.date;\n    this.comment = options.comment;\n    this.unixPermissions = options.unixPermissions;\n    this.dosPermissions = options.dosPermissions;\n\n    this._data = data;\n    this._dataBinary = options.binary;\n    // keep only the compression\n    this.options = {\n        compression : options.compression,\n        compressionOptions : options.compressionOptions\n    };\n};\n\nZipObject.prototype = {\n    /**\n     * Create an internal stream for the content of this object.\n     * @param {String} type the type of each chunk.\n     * @return StreamHelper the stream.\n     */\n    internalStream: function (type) {\n        var outputType = type.toLowerCase();\n        var askUnicodeString = outputType === \"string\" || outputType === \"text\";\n        if (outputType === \"binarystring\" || outputType === \"text\") {\n            outputType = \"string\";\n        }\n        var result = this._decompressWorker();\n\n        var isUnicodeString = !this._dataBinary;\n\n        if (isUnicodeString && !askUnicodeString) {\n            result = result.pipe(new utf8.Utf8EncodeWorker());\n        }\n        if (!isUnicodeString && askUnicodeString) {\n            result = result.pipe(new utf8.Utf8DecodeWorker());\n        }\n\n        return new StreamHelper(result, outputType, \"\");\n    },\n\n    /**\n     * Prepare the content in the asked type.\n     * @param {String} type the type of the result.\n     * @param {Function} onUpdate a function to call on each internal update.\n     * @return Promise the promise of the result.\n     */\n    async: function (type, onUpdate) {\n        return this.internalStream(type).accumulate(onUpdate);\n    },\n\n    /**\n     * Prepare the content as a nodejs stream.\n     * @param {String} type the type of each chunk.\n     * @param {Function} onUpdate a function to call on each internal update.\n     * @return Stream the stream.\n     */\n    nodeStream: function (type, onUpdate) {\n        return this.internalStream(type || \"nodebuffer\").toNodejsStream(onUpdate);\n    },\n\n    /**\n     * Return a worker for the compressed content.\n     * @private\n     * @param {Object} compression the compression object to use.\n     * @param {Object} compressionOptions the options to use when compressing.\n     * @return Worker the worker.\n     */\n    // _compressWorker: function (compression, compressionOptions) {\n    //     if (\n    //         this._data instanceof CompressedObject &&\n    //         this._data.compression.magic === compression.magic\n    //     ) {\n    //         return this._data.getCompressedWorker();\n    //     } else {\n    //         var result = this._decompressWorker();\n    //         if(!this._dataBinary) {\n    //             result = result.pipe(new utf8.Utf8EncodeWorker());\n    //         }\n    //         return CompressedObject.createWorkerFrom(result, compression, compressionOptions);\n    //     }\n    // },\n    /**\n     * Return a worker for the decompressed content.\n     * @private\n     * @return Worker the worker.\n     */\n    _decompressWorker : function () {\n        if (this._data instanceof CompressedObject) {\n            return this._data.getContentWorker();\n        } else if (this._data instanceof GenericWorker) {\n            return this._data;\n        } else {\n            return new DataWorker(this._data);\n        }\n    }\n};\n\nvar removedMethods = [\"asText\", \"asBinary\", \"asNodeBuffer\", \"asUint8Array\", \"asArrayBuffer\"];\nvar removedFn = function () {\n    throw new Error(\"This method has been removed in JSZip 3.0, please check the upgrade guide.\");\n};\n\nfor(var i = 0; i < removedMethods.length; i++) {\n    ZipObject.prototype[removedMethods[i]] = removedFn;\n}\nmodule.exports = ZipObject;\n",
-    "\"use strict\";\n\n// rawAsap provides everything we need except exception management.\nvar rawAsap = require(\"./raw\");\n// RawTasks are recycled to reduce GC churn.\nvar freeTasks = [];\n// We queue errors to ensure they are thrown in right order (FIFO).\n// Array-as-queue is good enough here, since we are just dealing with exceptions.\nvar pendingErrors = [];\nvar requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);\n\nfunction throwFirstError() {\n    if (pendingErrors.length) {\n        throw pendingErrors.shift();\n    }\n}\n\n/**\n * Calls a task as soon as possible after returning, in its own event, with priority\n * over other events like animation, reflow, and repaint. An error thrown from an\n * event will not interrupt, nor even substantially slow down the processing of\n * other events, but will be rather postponed to a lower priority event.\n * @param {{call}} task A callable object, typically a function that takes no\n * arguments.\n */\nmodule.exports = asap;\nfunction asap(task) {\n    var rawTask;\n    if (freeTasks.length) {\n        rawTask = freeTasks.pop();\n    } else {\n        rawTask = new RawTask();\n    }\n    rawTask.task = task;\n    rawAsap(rawTask);\n}\n\n// We wrap tasks with recyclable task objects.  A task object implements\n// `call`, just like a function.\nfunction RawTask() {\n    this.task = null;\n}\n\n// The sole purpose of wrapping the task is to catch the exception and recycle\n// the task object after its single use.\nRawTask.prototype.call = function () {\n    try {\n        this.task.call();\n    } catch (error) {\n        if (asap.onerror) {\n            // This hook exists purely for testing purposes.\n            // Its name will be periodically randomized to break any code that\n            // depends on its existence.\n            asap.onerror(error);\n        } else {\n            // In a web browser, exceptions are not fatal. However, to avoid\n            // slowing down the queue of pending tasks, we rethrow the error in a\n            // lower priority turn.\n            pendingErrors.push(error);\n            requestErrorThrow();\n        }\n    } finally {\n        this.task = null;\n        freeTasks[freeTasks.length] = this;\n    }\n};\n",
-    "\"use strict\";\n\n// Use the fastest means possible to execute a task in its own turn, with\n// priority over other events including IO, animation, reflow, and redraw\n// events in browsers.\n//\n// An exception thrown by a task will permanently interrupt the processing of\n// subsequent tasks. The higher level `asap` function ensures that if an\n// exception is thrown by a task, that the task queue will continue flushing as\n// soon as possible, but if you use `rawAsap` directly, you are responsible to\n// either ensure that no exceptions are thrown from your task, or to manually\n// call `rawAsap.requestFlush` if an exception is thrown.\nmodule.exports = rawAsap;\nfunction rawAsap(task) {\n    if (!queue.length) {\n        requestFlush();\n        flushing = true;\n    }\n    // Equivalent to push, but avoids a function call.\n    queue[queue.length] = task;\n}\n\nvar queue = [];\n// Once a flush has been requested, no further calls to `requestFlush` are\n// necessary until the next `flush` completes.\nvar flushing = false;\n// `requestFlush` is an implementation-specific method that attempts to kick\n// off a `flush` event as quickly as possible. `flush` will attempt to exhaust\n// the event queue before yielding to the browser's own event loop.\nvar requestFlush;\n// The position of the next task to execute in the task queue. This is\n// preserved between calls to `flush` so that it can be resumed if\n// a task throws an exception.\nvar index = 0;\n// If a task schedules additional tasks recursively, the task queue can grow\n// unbounded. To prevent memory exhaustion, the task queue will periodically\n// truncate already-completed tasks.\nvar capacity = 1024;\n\n// The flush function processes all tasks that have been scheduled with\n// `rawAsap` unless and until one of those tasks throws an exception.\n// If a task throws an exception, `flush` ensures that its state will remain\n// consistent and will resume where it left off when called again.\n// However, `flush` does not make any arrangements to be called again if an\n// exception is thrown.\nfunction flush() {\n    while (index < queue.length) {\n        var currentIndex = index;\n        // Advance the index before calling the task. This ensures that we will\n        // begin flushing on the next task the task throws an error.\n        index = index + 1;\n        queue[currentIndex].call();\n        // Prevent leaking memory for long chains of recursive calls to `asap`.\n        // If we call `asap` within tasks scheduled by `asap`, the queue will\n        // grow, but to avoid an O(n) walk for every task we execute, we don't\n        // shift tasks off the queue after they have been executed.\n        // Instead, we periodically shift 1024 tasks off the queue.\n        if (index > capacity) {\n            // Manually shift all values starting at the index back to the\n            // beginning of the queue.\n            for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {\n                queue[scan] = queue[scan + index];\n            }\n            queue.length -= index;\n            index = 0;\n        }\n    }\n    queue.length = 0;\n    index = 0;\n    flushing = false;\n}\n\n// `requestFlush` is implemented using a strategy based on data collected from\n// every available SauceLabs Selenium web driver worker at time of writing.\n// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593\n\n// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that\n// have WebKitMutationObserver but not un-prefixed MutationObserver.\n// Must use `global` or `self` instead of `window` to work in both frames and web\n// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.\n\n/* globals self */\nvar scope = typeof global !== \"undefined\" ? global : self;\nvar BrowserMutationObserver = scope.MutationObserver || scope.WebKitMutationObserver;\n\n// MutationObservers are desirable because they have high priority and work\n// reliably everywhere they are implemented.\n// They are implemented in all modern browsers.\n//\n// - Android 4-4.3\n// - Chrome 26-34\n// - Firefox 14-29\n// - Internet Explorer 11\n// - iPad Safari 6-7.1\n// - iPhone Safari 7-7.1\n// - Safari 6-7\nif (typeof BrowserMutationObserver === \"function\") {\n    requestFlush = makeRequestCallFromMutationObserver(flush);\n\n// MessageChannels are desirable because they give direct access to the HTML\n// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera\n// 11-12, and in web workers in many engines.\n// Although message channels yield to any queued rendering and IO tasks, they\n// would be better than imposing the 4ms delay of timers.\n// However, they do not work reliably in Internet Explorer or Safari.\n\n// Internet Explorer 10 is the only browser that has setImmediate but does\n// not have MutationObservers.\n// Although setImmediate yields to the browser's renderer, it would be\n// preferrable to falling back to setTimeout since it does not have\n// the minimum 4ms penalty.\n// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and\n// Desktop to a lesser extent) that renders both setImmediate and\n// MessageChannel useless for the purposes of ASAP.\n// https://github.com/kriskowal/q/issues/396\n\n// Timers are implemented universally.\n// We fall back to timers in workers in most engines, and in foreground\n// contexts in the following browsers.\n// However, note that even this simple case requires nuances to operate in a\n// broad spectrum of browsers.\n//\n// - Firefox 3-13\n// - Internet Explorer 6-9\n// - iPad Safari 4.3\n// - Lynx 2.8.7\n} else {\n    requestFlush = makeRequestCallFromTimer(flush);\n}\n\n// `requestFlush` requests that the high priority event queue be flushed as\n// soon as possible.\n// This is useful to prevent an error thrown in a task from stalling the event\n// queue if the exception handled by Node.js’s\n// `process.on(\"uncaughtException\")` or by a domain.\nrawAsap.requestFlush = requestFlush;\n\n// To request a high priority event, we induce a mutation observer by toggling\n// the text of a text node between \"1\" and \"-1\".\nfunction makeRequestCallFromMutationObserver(callback) {\n    var toggle = 1;\n    var observer = new BrowserMutationObserver(callback);\n    var node = document.createTextNode(\"\");\n    observer.observe(node, {characterData: true});\n    return function requestCall() {\n        toggle = -toggle;\n        node.data = toggle;\n    };\n}\n\n// The message channel technique was discovered by Malte Ubl and was the\n// original foundation for this library.\n// http://www.nonblocking.io/2011/06/windownexttick.html\n\n// Safari 6.0.5 (at least) intermittently fails to create message ports on a\n// page's first load. Thankfully, this version of Safari supports\n// MutationObservers, so we don't need to fall back in that case.\n\n// function makeRequestCallFromMessageChannel(callback) {\n//     var channel = new MessageChannel();\n//     channel.port1.onmessage = callback;\n//     return function requestCall() {\n//         channel.port2.postMessage(0);\n//     };\n// }\n\n// For reasons explained above, we are also unable to use `setImmediate`\n// under any circumstances.\n// Even if we were, there is another bug in Internet Explorer 10.\n// It is not sufficient to assign `setImmediate` to `requestFlush` because\n// `setImmediate` must be called *by name* and therefore must be wrapped in a\n// closure.\n// Never forget.\n\n// function makeRequestCallFromSetImmediate(callback) {\n//     return function requestCall() {\n//         setImmediate(callback);\n//     };\n// }\n\n// Safari 6.0 has a problem where timers will get lost while the user is\n// scrolling. This problem does not impact ASAP because Safari 6.0 supports\n// mutation observers, so that implementation is used instead.\n// However, if we ever elect to use timers in Safari, the prevalent work-around\n// is to add a scroll event listener that calls for a flush.\n\n// `setTimeout` does not call the passed callback if the delay is less than\n// approximately 7 in web workers in Firefox 8 through 18, and sometimes not\n// even then.\n\nfunction makeRequestCallFromTimer(callback) {\n    return function requestCall() {\n        // We dispatch a timeout with a specified delay of 0 for engines that\n        // can reliably accommodate that request. This will usually be snapped\n        // to a 4 milisecond delay, but once we're flushing, there's no delay\n        // between events.\n        var timeoutHandle = setTimeout(handleTimer, 0);\n        // However, since this timer gets frequently dropped in Firefox\n        // workers, we enlist an interval handle that will try to fire\n        // an event 20 times per second until it succeeds.\n        var intervalHandle = setInterval(handleTimer, 50);\n\n        function handleTimer() {\n            // Whichever timer succeeds will cancel both timers and\n            // execute the callback.\n            clearTimeout(timeoutHandle);\n            clearInterval(intervalHandle);\n            callback();\n        }\n    };\n}\n\n// This is for `asap.js` only.\n// Its name will be periodically randomized to break any code that depends on\n// its existence.\nrawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;\n\n// ASAP was originally a nextTick shim included in Q. This was factored out\n// into this ASAP package. It was later adapted to RSVP which made further\n// amendments. These decisions, particularly to marginalize MessageChannel and\n// to capture the MutationObserver implementation in a closure, were integrated\n// back into ASAP proper.\n// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js\n",
+    "// a duplex stream is just a stream that is both readable and writable.\n// Since JS doesn't have multiple prototypal inheritance, this class\n// prototypally inherits from Readable, and then parasitically from\n// Writable.\n\n'use strict';\n\n/*<replacement>*/\n\nvar objectKeys = Object.keys || function (obj) {\n  var keys = [];\n  for (var key in obj) {\n    keys.push(key);\n  }return keys;\n};\n/*</replacement>*/\n\nmodule.exports = Duplex;\n\n/*<replacement>*/\nvar processNextTick = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nvar Readable = require('./_stream_readable');\nvar Writable = require('./_stream_writable');\n\nutil.inherits(Duplex, Readable);\n\nvar keys = objectKeys(Writable.prototype);\nfor (var v = 0; v < keys.length; v++) {\n  var method = keys[v];\n  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];\n}\n\nfunction Duplex(options) {\n  if (!(this instanceof Duplex)) return new Duplex(options);\n\n  Readable.call(this, options);\n  Writable.call(this, options);\n\n  if (options && options.readable === false) this.readable = false;\n\n  if (options && options.writable === false) this.writable = false;\n\n  this.allowHalfOpen = true;\n  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;\n\n  this.once('end', onend);\n}\n\n// the no-half-open enforcer\nfunction onend() {\n  // if we allow half-open state, or if the writable side ended,\n  // then we're ok.\n  if (this.allowHalfOpen || this._writableState.ended) return;\n\n  // no more data can be written.\n  // But allow more writes to happen in this tick.\n  processNextTick(onEndNT, this);\n}\n\nfunction onEndNT(self) {\n  self.end();\n}\n\nfunction forEach(xs, f) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    f(xs[i], i);\n  }\n}",
+    "// a passthrough stream.\n// basically just the most minimal sort of Transform stream.\n// Every written chunk gets output as-is.\n\n'use strict';\n\nmodule.exports = PassThrough;\n\nvar Transform = require('./_stream_transform');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(PassThrough, Transform);\n\nfunction PassThrough(options) {\n  if (!(this instanceof PassThrough)) return new PassThrough(options);\n\n  Transform.call(this, options);\n}\n\nPassThrough.prototype._transform = function (chunk, encoding, cb) {\n  cb(null, chunk);\n};",
+    "'use strict';\n\nmodule.exports = Readable;\n\n/*<replacement>*/\nvar processNextTick = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar isArray = require('isarray');\n/*</replacement>*/\n\n/*<replacement>*/\nvar Buffer = require('buffer').Buffer;\n/*</replacement>*/\n\nReadable.ReadableState = ReadableState;\n\nvar EE = require('events');\n\n/*<replacement>*/\nvar EElistenerCount = function (emitter, type) {\n  return emitter.listeners(type).length;\n};\n/*</replacement>*/\n\n/*<replacement>*/\nvar Stream;\n(function () {\n  try {\n    Stream = require('st' + 'ream');\n  } catch (_) {} finally {\n    if (!Stream) Stream = require('events').EventEmitter;\n  }\n})();\n/*</replacement>*/\n\nvar Buffer = require('buffer').Buffer;\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\n/*<replacement>*/\nvar debugUtil = require('util');\nvar debug = undefined;\nif (debugUtil && debugUtil.debuglog) {\n  debug = debugUtil.debuglog('stream');\n} else {\n  debug = function () {};\n}\n/*</replacement>*/\n\nvar StringDecoder;\n\nutil.inherits(Readable, Stream);\n\nvar Duplex;\nfunction ReadableState(options, stream) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  options = options || {};\n\n  // object stream flag. Used to make read(n) ignore n and to\n  // make all the buffer merging and length checks go away\n  this.objectMode = !!options.objectMode;\n\n  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;\n\n  // the point at which it stops calling _read() to fill the buffer\n  // Note: 0 is a valid value, means \"don't call _read preemptively ever\"\n  var hwm = options.highWaterMark;\n  var defaultHwm = this.objectMode ? 16 : 16 * 1024;\n  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;\n\n  // cast to ints.\n  this.highWaterMark = ~ ~this.highWaterMark;\n\n  this.buffer = [];\n  this.length = 0;\n  this.pipes = null;\n  this.pipesCount = 0;\n  this.flowing = null;\n  this.ended = false;\n  this.endEmitted = false;\n  this.reading = false;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, because any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // whenever we return null, then we set a flag to say\n  // that we're awaiting a 'readable' event emission.\n  this.needReadable = false;\n  this.emittedReadable = false;\n  this.readableListening = false;\n  this.resumeScheduled = false;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // when piping, we only care about 'readable' events that happen\n  // after read()ing all the bytes and not getting any pushback.\n  this.ranOut = false;\n\n  // the number of writers that are awaiting a drain event in .pipe()s\n  this.awaitDrain = 0;\n\n  // if true, a maybeReadMore has been scheduled\n  this.readingMore = false;\n\n  this.decoder = null;\n  this.encoding = null;\n  if (options.encoding) {\n    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n    this.decoder = new StringDecoder(options.encoding);\n    this.encoding = options.encoding;\n  }\n}\n\nvar Duplex;\nfunction Readable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  if (!(this instanceof Readable)) return new Readable(options);\n\n  this._readableState = new ReadableState(options, this);\n\n  // legacy\n  this.readable = true;\n\n  if (options && typeof options.read === 'function') this._read = options.read;\n\n  Stream.call(this);\n}\n\n// Manually shove something into the read() buffer.\n// This returns true if the highWaterMark has not been hit yet,\n// similar to how Writable.write() returns true if you should\n// write() some more.\nReadable.prototype.push = function (chunk, encoding) {\n  var state = this._readableState;\n\n  if (!state.objectMode && typeof chunk === 'string') {\n    encoding = encoding || state.defaultEncoding;\n    if (encoding !== state.encoding) {\n      chunk = new Buffer(chunk, encoding);\n      encoding = '';\n    }\n  }\n\n  return readableAddChunk(this, state, chunk, encoding, false);\n};\n\n// Unshift should *always* be something directly out of read()\nReadable.prototype.unshift = function (chunk) {\n  var state = this._readableState;\n  return readableAddChunk(this, state, chunk, '', true);\n};\n\nReadable.prototype.isPaused = function () {\n  return this._readableState.flowing === false;\n};\n\nfunction readableAddChunk(stream, state, chunk, encoding, addToFront) {\n  var er = chunkInvalid(state, chunk);\n  if (er) {\n    stream.emit('error', er);\n  } else if (chunk === null) {\n    state.reading = false;\n    onEofChunk(stream, state);\n  } else if (state.objectMode || chunk && chunk.length > 0) {\n    if (state.ended && !addToFront) {\n      var e = new Error('stream.push() after EOF');\n      stream.emit('error', e);\n    } else if (state.endEmitted && addToFront) {\n      var e = new Error('stream.unshift() after end event');\n      stream.emit('error', e);\n    } else {\n      var skipAdd;\n      if (state.decoder && !addToFront && !encoding) {\n        chunk = state.decoder.write(chunk);\n        skipAdd = !state.objectMode && chunk.length === 0;\n      }\n\n      if (!addToFront) state.reading = false;\n\n      // Don't add to the buffer if we've decoded to an empty string chunk and\n      // we're not in object mode\n      if (!skipAdd) {\n        // if we want the data now, just emit it.\n        if (state.flowing && state.length === 0 && !state.sync) {\n          stream.emit('data', chunk);\n          stream.read(0);\n        } else {\n          // update the buffer info.\n          state.length += state.objectMode ? 1 : chunk.length;\n          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);\n\n          if (state.needReadable) emitReadable(stream);\n        }\n      }\n\n      maybeReadMore(stream, state);\n    }\n  } else if (!addToFront) {\n    state.reading = false;\n  }\n\n  return needMoreData(state);\n}\n\n// if it's past the high water mark, we can push in some more.\n// Also, if we have no data yet, we can stand some\n// more bytes.  This is to work around cases where hwm=0,\n// such as the repl.  Also, if the push() triggered a\n// readable event, and the user called read(largeNumber) such that\n// needReadable was set, then we ought to push more, so that another\n// 'readable' event will be triggered.\nfunction needMoreData(state) {\n  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);\n}\n\n// backwards compatibility.\nReadable.prototype.setEncoding = function (enc) {\n  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n  this._readableState.decoder = new StringDecoder(enc);\n  this._readableState.encoding = enc;\n  return this;\n};\n\n// Don't raise the hwm > 8MB\nvar MAX_HWM = 0x800000;\nfunction computeNewHighWaterMark(n) {\n  if (n >= MAX_HWM) {\n    n = MAX_HWM;\n  } else {\n    // Get the next highest power of 2\n    n--;\n    n |= n >>> 1;\n    n |= n >>> 2;\n    n |= n >>> 4;\n    n |= n >>> 8;\n    n |= n >>> 16;\n    n++;\n  }\n  return n;\n}\n\nfunction howMuchToRead(n, state) {\n  if (state.length === 0 && state.ended) return 0;\n\n  if (state.objectMode) return n === 0 ? 0 : 1;\n\n  if (n === null || isNaN(n)) {\n    // only flow one buffer at a time\n    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;\n  }\n\n  if (n <= 0) return 0;\n\n  // If we're asking for more than the target buffer level,\n  // then raise the water mark.  Bump up to the next highest\n  // power of 2, to prevent increasing it excessively in tiny\n  // amounts.\n  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);\n\n  // don't have that much.  return null, unless we've ended.\n  if (n > state.length) {\n    if (!state.ended) {\n      state.needReadable = true;\n      return 0;\n    } else {\n      return state.length;\n    }\n  }\n\n  return n;\n}\n\n// you can override either this method, or the async _read(n) below.\nReadable.prototype.read = function (n) {\n  debug('read', n);\n  var state = this._readableState;\n  var nOrig = n;\n\n  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;\n\n  // if we're doing read(0) to trigger a readable event, but we\n  // already have a bunch of data in the buffer, then just trigger\n  // the 'readable' event and move on.\n  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {\n    debug('read: emitReadable', state.length, state.ended);\n    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);\n    return null;\n  }\n\n  n = howMuchToRead(n, state);\n\n  // if we've ended, and we're now clear, then finish it up.\n  if (n === 0 && state.ended) {\n    if (state.length === 0) endReadable(this);\n    return null;\n  }\n\n  // All the actual chunk generation logic needs to be\n  // *below* the call to _read.  The reason is that in certain\n  // synthetic stream cases, such as passthrough streams, _read\n  // may be a completely synchronous operation which may change\n  // the state of the read buffer, providing enough data when\n  // before there was *not* enough.\n  //\n  // So, the steps are:\n  // 1. Figure out what the state of things will be after we do\n  // a read from the buffer.\n  //\n  // 2. If that resulting state will trigger a _read, then call _read.\n  // Note that this may be asynchronous, or synchronous.  Yes, it is\n  // deeply ugly to write APIs this way, but that still doesn't mean\n  // that the Readable class should behave improperly, as streams are\n  // designed to be sync/async agnostic.\n  // Take note if the _read call is sync or async (ie, if the read call\n  // has returned yet), so that we know whether or not it's safe to emit\n  // 'readable' etc.\n  //\n  // 3. Actually pull the requested chunks out of the buffer and return.\n\n  // if we need a readable event, then we need to do some reading.\n  var doRead = state.needReadable;\n  debug('need readable', doRead);\n\n  // if we currently have less than the highWaterMark, then also read some\n  if (state.length === 0 || state.length - n < state.highWaterMark) {\n    doRead = true;\n    debug('length less than watermark', doRead);\n  }\n\n  // however, if we've ended, then there's no point, and if we're already\n  // reading, then it's unnecessary.\n  if (state.ended || state.reading) {\n    doRead = false;\n    debug('reading or ended', doRead);\n  }\n\n  if (doRead) {\n    debug('do read');\n    state.reading = true;\n    state.sync = true;\n    // if the length is currently zero, then we *need* a readable event.\n    if (state.length === 0) state.needReadable = true;\n    // call internal read method\n    this._read(state.highWaterMark);\n    state.sync = false;\n  }\n\n  // If _read pushed data synchronously, then `reading` will be false,\n  // and we need to re-evaluate how much data we can return to the user.\n  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);\n\n  var ret;\n  if (n > 0) ret = fromList(n, state);else ret = null;\n\n  if (ret === null) {\n    state.needReadable = true;\n    n = 0;\n  }\n\n  state.length -= n;\n\n  // If we have nothing in the buffer, then we want to know\n  // as soon as we *do* get something into the buffer.\n  if (state.length === 0 && !state.ended) state.needReadable = true;\n\n  // If we tried to read() past the EOF, then emit end on the next tick.\n  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);\n\n  if (ret !== null) this.emit('data', ret);\n\n  return ret;\n};\n\nfunction chunkInvalid(state, chunk) {\n  var er = null;\n  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {\n    er = new TypeError('Invalid non-string/buffer chunk');\n  }\n  return er;\n}\n\nfunction onEofChunk(stream, state) {\n  if (state.ended) return;\n  if (state.decoder) {\n    var chunk = state.decoder.end();\n    if (chunk && chunk.length) {\n      state.buffer.push(chunk);\n      state.length += state.objectMode ? 1 : chunk.length;\n    }\n  }\n  state.ended = true;\n\n  // emit 'readable' now to make sure it gets picked up.\n  emitReadable(stream);\n}\n\n// Don't emit readable right away in sync mode, because this can trigger\n// another read() call => stack overflow.  This way, it might trigger\n// a nextTick recursion warning, but that's not so bad.\nfunction emitReadable(stream) {\n  var state = stream._readableState;\n  state.needReadable = false;\n  if (!state.emittedReadable) {\n    debug('emitReadable', state.flowing);\n    state.emittedReadable = true;\n    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);\n  }\n}\n\nfunction emitReadable_(stream) {\n  debug('emit readable');\n  stream.emit('readable');\n  flow(stream);\n}\n\n// at this point, the user has presumably seen the 'readable' event,\n// and called read() to consume some data.  that may have triggered\n// in turn another _read(n) call, in which case reading = true if\n// it's in progress.\n// However, if we're not ended, or reading, and the length < hwm,\n// then go ahead and try to read some more preemptively.\nfunction maybeReadMore(stream, state) {\n  if (!state.readingMore) {\n    state.readingMore = true;\n    processNextTick(maybeReadMore_, stream, state);\n  }\n}\n\nfunction maybeReadMore_(stream, state) {\n  var len = state.length;\n  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {\n    debug('maybeReadMore read 0');\n    stream.read(0);\n    if (len === state.length)\n      // didn't get any data, stop spinning.\n      break;else len = state.length;\n  }\n  state.readingMore = false;\n}\n\n// abstract method.  to be overridden in specific implementation classes.\n// call cb(er, data) where data is <= n in length.\n// for virtual (non-string, non-buffer) streams, \"length\" is somewhat\n// arbitrary, and perhaps not very meaningful.\nReadable.prototype._read = function (n) {\n  this.emit('error', new Error('not implemented'));\n};\n\nReadable.prototype.pipe = function (dest, pipeOpts) {\n  var src = this;\n  var state = this._readableState;\n\n  switch (state.pipesCount) {\n    case 0:\n      state.pipes = dest;\n      break;\n    case 1:\n      state.pipes = [state.pipes, dest];\n      break;\n    default:\n      state.pipes.push(dest);\n      break;\n  }\n  state.pipesCount += 1;\n  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);\n\n  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;\n\n  var endFn = doEnd ? onend : cleanup;\n  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);\n\n  dest.on('unpipe', onunpipe);\n  function onunpipe(readable) {\n    debug('onunpipe');\n    if (readable === src) {\n      cleanup();\n    }\n  }\n\n  function onend() {\n    debug('onend');\n    dest.end();\n  }\n\n  // when the dest drains, it reduces the awaitDrain counter\n  // on the source.  This would be more elegant with a .once()\n  // handler in flow(), but adding and removing repeatedly is\n  // too slow.\n  var ondrain = pipeOnDrain(src);\n  dest.on('drain', ondrain);\n\n  var cleanedUp = false;\n  function cleanup() {\n    debug('cleanup');\n    // cleanup event handlers once the pipe is broken\n    dest.removeListener('close', onclose);\n    dest.removeListener('finish', onfinish);\n    dest.removeListener('drain', ondrain);\n    dest.removeListener('error', onerror);\n    dest.removeListener('unpipe', onunpipe);\n    src.removeListener('end', onend);\n    src.removeListener('end', cleanup);\n    src.removeListener('data', ondata);\n\n    cleanedUp = true;\n\n    // if the reader is waiting for a drain event from this\n    // specific writer, then it would cause it to never start\n    // flowing again.\n    // So, if this is awaiting a drain, then we just call it now.\n    // If we don't know, then assume that we are waiting for one.\n    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();\n  }\n\n  src.on('data', ondata);\n  function ondata(chunk) {\n    debug('ondata');\n    var ret = dest.write(chunk);\n    if (false === ret) {\n      // If the user unpiped during `dest.write()`, it is possible\n      // to get stuck in a permanently paused state if that write\n      // also returned false.\n      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {\n        debug('false write response, pause', src._readableState.awaitDrain);\n        src._readableState.awaitDrain++;\n      }\n      src.pause();\n    }\n  }\n\n  // if the dest has an error, then stop piping into it.\n  // however, don't suppress the throwing behavior for this.\n  function onerror(er) {\n    debug('onerror', er);\n    unpipe();\n    dest.removeListener('error', onerror);\n    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);\n  }\n  // This is a brutally ugly hack to make sure that our error handler\n  // is attached before any userland ones.  NEVER DO THIS.\n  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];\n\n  // Both close and finish should trigger unpipe, but only once.\n  function onclose() {\n    dest.removeListener('finish', onfinish);\n    unpipe();\n  }\n  dest.once('close', onclose);\n  function onfinish() {\n    debug('onfinish');\n    dest.removeListener('close', onclose);\n    unpipe();\n  }\n  dest.once('finish', onfinish);\n\n  function unpipe() {\n    debug('unpipe');\n    src.unpipe(dest);\n  }\n\n  // tell the dest that it's being piped to\n  dest.emit('pipe', src);\n\n  // start the flow if it hasn't been started already.\n  if (!state.flowing) {\n    debug('pipe resume');\n    src.resume();\n  }\n\n  return dest;\n};\n\nfunction pipeOnDrain(src) {\n  return function () {\n    var state = src._readableState;\n    debug('pipeOnDrain', state.awaitDrain);\n    if (state.awaitDrain) state.awaitDrain--;\n    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {\n      state.flowing = true;\n      flow(src);\n    }\n  };\n}\n\nReadable.prototype.unpipe = function (dest) {\n  var state = this._readableState;\n\n  // if we're not piping anywhere, then do nothing.\n  if (state.pipesCount === 0) return this;\n\n  // just one destination.  most common case.\n  if (state.pipesCount === 1) {\n    // passed in one, but it's not the right one.\n    if (dest && dest !== state.pipes) return this;\n\n    if (!dest) dest = state.pipes;\n\n    // got a match.\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n    if (dest) dest.emit('unpipe', this);\n    return this;\n  }\n\n  // slow case. multiple pipe destinations.\n\n  if (!dest) {\n    // remove all.\n    var dests = state.pipes;\n    var len = state.pipesCount;\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n\n    for (var _i = 0; _i < len; _i++) {\n      dests[_i].emit('unpipe', this);\n    }return this;\n  }\n\n  // try to find the right one.\n  var i = indexOf(state.pipes, dest);\n  if (i === -1) return this;\n\n  state.pipes.splice(i, 1);\n  state.pipesCount -= 1;\n  if (state.pipesCount === 1) state.pipes = state.pipes[0];\n\n  dest.emit('unpipe', this);\n\n  return this;\n};\n\n// set up data events if they are asked for\n// Ensure readable listeners eventually get something\nReadable.prototype.on = function (ev, fn) {\n  var res = Stream.prototype.on.call(this, ev, fn);\n\n  // If listening to data, and it has not explicitly been paused,\n  // then call resume to start the flow of data on the next tick.\n  if (ev === 'data' && false !== this._readableState.flowing) {\n    this.resume();\n  }\n\n  if (ev === 'readable' && !this._readableState.endEmitted) {\n    var state = this._readableState;\n    if (!state.readableListening) {\n      state.readableListening = true;\n      state.emittedReadable = false;\n      state.needReadable = true;\n      if (!state.reading) {\n        processNextTick(nReadingNextTick, this);\n      } else if (state.length) {\n        emitReadable(this, state);\n      }\n    }\n  }\n\n  return res;\n};\nReadable.prototype.addListener = Readable.prototype.on;\n\nfunction nReadingNextTick(self) {\n  debug('readable nexttick read 0');\n  self.read(0);\n}\n\n// pause() and resume() are remnants of the legacy readable stream API\n// If the user uses them, then switch into old mode.\nReadable.prototype.resume = function () {\n  var state = this._readableState;\n  if (!state.flowing) {\n    debug('resume');\n    state.flowing = true;\n    resume(this, state);\n  }\n  return this;\n};\n\nfunction resume(stream, state) {\n  if (!state.resumeScheduled) {\n    state.resumeScheduled = true;\n    processNextTick(resume_, stream, state);\n  }\n}\n\nfunction resume_(stream, state) {\n  if (!state.reading) {\n    debug('resume read 0');\n    stream.read(0);\n  }\n\n  state.resumeScheduled = false;\n  stream.emit('resume');\n  flow(stream);\n  if (state.flowing && !state.reading) stream.read(0);\n}\n\nReadable.prototype.pause = function () {\n  debug('call pause flowing=%j', this._readableState.flowing);\n  if (false !== this._readableState.flowing) {\n    debug('pause');\n    this._readableState.flowing = false;\n    this.emit('pause');\n  }\n  return this;\n};\n\nfunction flow(stream) {\n  var state = stream._readableState;\n  debug('flow', state.flowing);\n  if (state.flowing) {\n    do {\n      var chunk = stream.read();\n    } while (null !== chunk && state.flowing);\n  }\n}\n\n// wrap an old-style stream as the async data source.\n// This is *not* part of the readable stream interface.\n// It is an ugly unfortunate mess of history.\nReadable.prototype.wrap = function (stream) {\n  var state = this._readableState;\n  var paused = false;\n\n  var self = this;\n  stream.on('end', function () {\n    debug('wrapped end');\n    if (state.decoder && !state.ended) {\n      var chunk = state.decoder.end();\n      if (chunk && chunk.length) self.push(chunk);\n    }\n\n    self.push(null);\n  });\n\n  stream.on('data', function (chunk) {\n    debug('wrapped data');\n    if (state.decoder) chunk = state.decoder.write(chunk);\n\n    // don't skip over falsy values in objectMode\n    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;\n\n    var ret = self.push(chunk);\n    if (!ret) {\n      paused = true;\n      stream.pause();\n    }\n  });\n\n  // proxy all the other methods.\n  // important when wrapping filters and duplexes.\n  for (var i in stream) {\n    if (this[i] === undefined && typeof stream[i] === 'function') {\n      this[i] = function (method) {\n        return function () {\n          return stream[method].apply(stream, arguments);\n        };\n      }(i);\n    }\n  }\n\n  // proxy certain important events.\n  var events = ['error', 'close', 'destroy', 'pause', 'resume'];\n  forEach(events, function (ev) {\n    stream.on(ev, self.emit.bind(self, ev));\n  });\n\n  // when we try to consume some more bytes, simply unpause the\n  // underlying stream.\n  self._read = function (n) {\n    debug('wrapped _read', n);\n    if (paused) {\n      paused = false;\n      stream.resume();\n    }\n  };\n\n  return self;\n};\n\n// exposed for testing purposes only.\nReadable._fromList = fromList;\n\n// Pluck off n bytes from an array of buffers.\n// Length is the combined lengths of all the buffers in the list.\nfunction fromList(n, state) {\n  var list = state.buffer;\n  var length = state.length;\n  var stringMode = !!state.decoder;\n  var objectMode = !!state.objectMode;\n  var ret;\n\n  // nothing in the list, definitely empty.\n  if (list.length === 0) return null;\n\n  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {\n    // read it all, truncate the array.\n    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);\n    list.length = 0;\n  } else {\n    // read just some of it.\n    if (n < list[0].length) {\n      // just take a part of the first list item.\n      // slice is the same for buffers and strings.\n      var buf = list[0];\n      ret = buf.slice(0, n);\n      list[0] = buf.slice(n);\n    } else if (n === list[0].length) {\n      // first list is a perfect match\n      ret = list.shift();\n    } else {\n      // complex case.\n      // we have enough to cover it, but it spans past the first buffer.\n      if (stringMode) ret = '';else ret = new Buffer(n);\n\n      var c = 0;\n      for (var i = 0, l = list.length; i < l && c < n; i++) {\n        var buf = list[0];\n        var cpy = Math.min(n - c, buf.length);\n\n        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);\n\n        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();\n\n        c += cpy;\n      }\n    }\n  }\n\n  return ret;\n}\n\nfunction endReadable(stream) {\n  var state = stream._readableState;\n\n  // If we get here before consuming all the bytes, then that is a\n  // bug in node.  Should never happen.\n  if (state.length > 0) throw new Error('endReadable called on non-empty stream');\n\n  if (!state.endEmitted) {\n    state.ended = true;\n    processNextTick(endReadableNT, state, stream);\n  }\n}\n\nfunction endReadableNT(state, stream) {\n  // Check that we didn't get one last unshift.\n  if (!state.endEmitted && state.length === 0) {\n    state.endEmitted = true;\n    stream.readable = false;\n    stream.emit('end');\n  }\n}\n\nfunction forEach(xs, f) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    f(xs[i], i);\n  }\n}\n\nfunction indexOf(xs, x) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    if (xs[i] === x) return i;\n  }\n  return -1;\n}",
+    "// a transform stream is a readable/writable stream where you do\n// something with the data.  Sometimes it's called a \"filter\",\n// but that's not a great name for it, since that implies a thing where\n// some bits pass through, and others are simply ignored.  (That would\n// be a valid example of a transform, of course.)\n//\n// While the output is causally related to the input, it's not a\n// necessarily symmetric or synchronous transformation.  For example,\n// a zlib stream might take multiple plain-text writes(), and then\n// emit a single compressed chunk some time in the future.\n//\n// Here's how this works:\n//\n// The Transform stream has all the aspects of the readable and writable\n// stream classes.  When you write(chunk), that calls _write(chunk,cb)\n// internally, and returns false if there's a lot of pending writes\n// buffered up.  When you call read(), that calls _read(n) until\n// there's enough pending readable data buffered up.\n//\n// In a transform stream, the written data is placed in a buffer.  When\n// _read(n) is called, it transforms the queued up data, calling the\n// buffered _write cb's as it consumes chunks.  If consuming a single\n// written chunk would result in multiple output chunks, then the first\n// outputted bit calls the readcb, and subsequent chunks just go into\n// the read buffer, and will cause it to emit 'readable' if necessary.\n//\n// This way, back-pressure is actually determined by the reading side,\n// since _read has to be called to start processing a new chunk.  However,\n// a pathological inflate type of transform can cause excessive buffering\n// here.  For example, imagine a stream where every byte of input is\n// interpreted as an integer from 0-255, and then results in that many\n// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in\n// 1kb of data being output.  In this case, you could write a very small\n// amount of input, and end up with a very large amount of output.  In\n// such a pathological inflating mechanism, there'd be no way to tell\n// the system to stop doing the transform.  A single 4MB write could\n// cause the system to run out of memory.\n//\n// However, even in such a pathological case, only a single written chunk\n// would be consumed, and then the rest would wait (un-transformed) until\n// the results of the previous transformed chunk were consumed.\n\n'use strict';\n\nmodule.exports = Transform;\n\nvar Duplex = require('./_stream_duplex');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(Transform, Duplex);\n\nfunction TransformState(stream) {\n  this.afterTransform = function (er, data) {\n    return afterTransform(stream, er, data);\n  };\n\n  this.needTransform = false;\n  this.transforming = false;\n  this.writecb = null;\n  this.writechunk = null;\n  this.writeencoding = null;\n}\n\nfunction afterTransform(stream, er, data) {\n  var ts = stream._transformState;\n  ts.transforming = false;\n\n  var cb = ts.writecb;\n\n  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));\n\n  ts.writechunk = null;\n  ts.writecb = null;\n\n  if (data !== null && data !== undefined) stream.push(data);\n\n  cb(er);\n\n  var rs = stream._readableState;\n  rs.reading = false;\n  if (rs.needReadable || rs.length < rs.highWaterMark) {\n    stream._read(rs.highWaterMark);\n  }\n}\n\nfunction Transform(options) {\n  if (!(this instanceof Transform)) return new Transform(options);\n\n  Duplex.call(this, options);\n\n  this._transformState = new TransformState(this);\n\n  // when the writable side finishes, then flush out anything remaining.\n  var stream = this;\n\n  // start out asking for a readable event once data is transformed.\n  this._readableState.needReadable = true;\n\n  // we have implemented the _read method, and done the other things\n  // that Readable wants before the first _read call, so unset the\n  // sync guard flag.\n  this._readableState.sync = false;\n\n  if (options) {\n    if (typeof options.transform === 'function') this._transform = options.transform;\n\n    if (typeof options.flush === 'function') this._flush = options.flush;\n  }\n\n  this.once('prefinish', function () {\n    if (typeof this._flush === 'function') this._flush(function (er) {\n      done(stream, er);\n    });else done(stream);\n  });\n}\n\nTransform.prototype.push = function (chunk, encoding) {\n  this._transformState.needTransform = false;\n  return Duplex.prototype.push.call(this, chunk, encoding);\n};\n\n// This is the part where you do stuff!\n// override this function in implementation classes.\n// 'chunk' is an input chunk.\n//\n// Call `push(newChunk)` to pass along transformed output\n// to the readable side.  You may call 'push' zero or more times.\n//\n// Call `cb(err)` when you are done with this chunk.  If you pass\n// an error, then that'll put the hurt on the whole operation.  If you\n// never call cb(), then you'll never get another chunk.\nTransform.prototype._transform = function (chunk, encoding, cb) {\n  throw new Error('not implemented');\n};\n\nTransform.prototype._write = function (chunk, encoding, cb) {\n  var ts = this._transformState;\n  ts.writecb = cb;\n  ts.writechunk = chunk;\n  ts.writeencoding = encoding;\n  if (!ts.transforming) {\n    var rs = this._readableState;\n    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);\n  }\n};\n\n// Doesn't matter what the args are here.\n// _transform does all the work.\n// That we got here means that the readable side wants more data.\nTransform.prototype._read = function (n) {\n  var ts = this._transformState;\n\n  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {\n    ts.transforming = true;\n    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);\n  } else {\n    // mark that we need a transform, so that any data that comes in\n    // will get processed, now that we've asked for it.\n    ts.needTransform = true;\n  }\n};\n\nfunction done(stream, er) {\n  if (er) return stream.emit('error', er);\n\n  // if there's nothing in the write buffer, then that means\n  // that nothing more will ever be provided\n  var ws = stream._writableState;\n  var ts = stream._transformState;\n\n  if (ws.length) throw new Error('calling transform done when ws.length != 0');\n\n  if (ts.transforming) throw new Error('calling transform done when still transforming');\n\n  return stream.push(null);\n}",
+    "// A bit simpler than readable streams.\n// Implement an async ._write(chunk, encoding, cb), and it'll handle all\n// the drain event emission and buffering.\n\n'use strict';\n\nmodule.exports = Writable;\n\n/*<replacement>*/\nvar processNextTick = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;\n/*</replacement>*/\n\n/*<replacement>*/\nvar Buffer = require('buffer').Buffer;\n/*</replacement>*/\n\nWritable.WritableState = WritableState;\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\n/*<replacement>*/\nvar internalUtil = {\n  deprecate: require('util-deprecate')\n};\n/*</replacement>*/\n\n/*<replacement>*/\nvar Stream;\n(function () {\n  try {\n    Stream = require('st' + 'ream');\n  } catch (_) {} finally {\n    if (!Stream) Stream = require('events').EventEmitter;\n  }\n})();\n/*</replacement>*/\n\nvar Buffer = require('buffer').Buffer;\n\nutil.inherits(Writable, Stream);\n\nfunction nop() {}\n\nfunction WriteReq(chunk, encoding, cb) {\n  this.chunk = chunk;\n  this.encoding = encoding;\n  this.callback = cb;\n  this.next = null;\n}\n\nvar Duplex;\nfunction WritableState(options, stream) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  options = options || {};\n\n  // object stream flag to indicate whether or not this stream\n  // contains buffers or objects.\n  this.objectMode = !!options.objectMode;\n\n  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;\n\n  // the point at which write() starts returning false\n  // Note: 0 is a valid value, means that we always return false if\n  // the entire buffer is not flushed immediately on write()\n  var hwm = options.highWaterMark;\n  var defaultHwm = this.objectMode ? 16 : 16 * 1024;\n  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;\n\n  // cast to ints.\n  this.highWaterMark = ~ ~this.highWaterMark;\n\n  this.needDrain = false;\n  // at the start of calling end()\n  this.ending = false;\n  // when end() has been called, and returned\n  this.ended = false;\n  // when 'finish' is emitted\n  this.finished = false;\n\n  // should we decode strings into buffers before passing to _write?\n  // this is here so that some node-core streams can optimize string\n  // handling at a lower level.\n  var noDecode = options.decodeStrings === false;\n  this.decodeStrings = !noDecode;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // not an actual buffer we keep track of, but a measurement\n  // of how much we're waiting to get pushed to some underlying\n  // socket or file.\n  this.length = 0;\n\n  // a flag to see when we're in the middle of a write.\n  this.writing = false;\n\n  // when true all writes will be buffered until .uncork() call\n  this.corked = 0;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, because any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // a flag to know if we're processing previously buffered items, which\n  // may call the _write() callback in the same tick, so that we don't\n  // end up in an overlapped onwrite situation.\n  this.bufferProcessing = false;\n\n  // the callback that's passed to _write(chunk,cb)\n  this.onwrite = function (er) {\n    onwrite(stream, er);\n  };\n\n  // the callback that the user supplies to write(chunk,encoding,cb)\n  this.writecb = null;\n\n  // the amount that is being written when _write is called.\n  this.writelen = 0;\n\n  this.bufferedRequest = null;\n  this.lastBufferedRequest = null;\n\n  // number of pending user-supplied write callbacks\n  // this must be 0 before 'finish' can be emitted\n  this.pendingcb = 0;\n\n  // emit prefinish if the only thing we're waiting for is _write cbs\n  // This is relevant for synchronous Transform streams\n  this.prefinished = false;\n\n  // True if the error was already emitted and should not be thrown again\n  this.errorEmitted = false;\n\n  // count buffered requests\n  this.bufferedRequestCount = 0;\n\n  // create the two objects needed to store the corked requests\n  // they are not a linked list, as no new elements are inserted in there\n  this.corkedRequestsFree = new CorkedRequest(this);\n  this.corkedRequestsFree.next = new CorkedRequest(this);\n}\n\nWritableState.prototype.getBuffer = function writableStateGetBuffer() {\n  var current = this.bufferedRequest;\n  var out = [];\n  while (current) {\n    out.push(current);\n    current = current.next;\n  }\n  return out;\n};\n\n(function () {\n  try {\n    Object.defineProperty(WritableState.prototype, 'buffer', {\n      get: internalUtil.deprecate(function () {\n        return this.getBuffer();\n      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')\n    });\n  } catch (_) {}\n})();\n\nvar Duplex;\nfunction Writable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  // Writable ctor is applied to Duplexes, though they're not\n  // instanceof Writable, they're instanceof Readable.\n  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);\n\n  this._writableState = new WritableState(options, this);\n\n  // legacy.\n  this.writable = true;\n\n  if (options) {\n    if (typeof options.write === 'function') this._write = options.write;\n\n    if (typeof options.writev === 'function') this._writev = options.writev;\n  }\n\n  Stream.call(this);\n}\n\n// Otherwise people can pipe Writable streams, which is just wrong.\nWritable.prototype.pipe = function () {\n  this.emit('error', new Error('Cannot pipe. Not readable.'));\n};\n\nfunction writeAfterEnd(stream, cb) {\n  var er = new Error('write after end');\n  // TODO: defer error events consistently everywhere, not just the cb\n  stream.emit('error', er);\n  processNextTick(cb, er);\n}\n\n// If we get something that is not a buffer, string, null, or undefined,\n// and we're not in objectMode, then that's an error.\n// Otherwise stream chunks are all considered to be of length=1, and the\n// watermarks determine how many objects to keep in the buffer, rather than\n// how many bytes or characters.\nfunction validChunk(stream, state, chunk, cb) {\n  var valid = true;\n\n  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {\n    var er = new TypeError('Invalid non-string/buffer chunk');\n    stream.emit('error', er);\n    processNextTick(cb, er);\n    valid = false;\n  }\n  return valid;\n}\n\nWritable.prototype.write = function (chunk, encoding, cb) {\n  var state = this._writableState;\n  var ret = false;\n\n  if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;\n\n  if (typeof cb !== 'function') cb = nop;\n\n  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {\n    state.pendingcb++;\n    ret = writeOrBuffer(this, state, chunk, encoding, cb);\n  }\n\n  return ret;\n};\n\nWritable.prototype.cork = function () {\n  var state = this._writableState;\n\n  state.corked++;\n};\n\nWritable.prototype.uncork = function () {\n  var state = this._writableState;\n\n  if (state.corked) {\n    state.corked--;\n\n    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);\n  }\n};\n\nWritable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {\n  // node::ParseEncoding() requires lower case.\n  if (typeof encoding === 'string') encoding = encoding.toLowerCase();\n  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);\n  this._writableState.defaultEncoding = encoding;\n};\n\nfunction decodeChunk(state, chunk, encoding) {\n  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {\n    chunk = new Buffer(chunk, encoding);\n  }\n  return chunk;\n}\n\n// if we're already writing something, then just put this\n// in the queue, and wait our turn.  Otherwise, call _write\n// If we return false, then we need a drain event, so set that flag.\nfunction writeOrBuffer(stream, state, chunk, encoding, cb) {\n  chunk = decodeChunk(state, chunk, encoding);\n\n  if (Buffer.isBuffer(chunk)) encoding = 'buffer';\n  var len = state.objectMode ? 1 : chunk.length;\n\n  state.length += len;\n\n  var ret = state.length < state.highWaterMark;\n  // we must ensure that previous needDrain will not be reset to false.\n  if (!ret) state.needDrain = true;\n\n  if (state.writing || state.corked) {\n    var last = state.lastBufferedRequest;\n    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);\n    if (last) {\n      last.next = state.lastBufferedRequest;\n    } else {\n      state.bufferedRequest = state.lastBufferedRequest;\n    }\n    state.bufferedRequestCount += 1;\n  } else {\n    doWrite(stream, state, false, len, chunk, encoding, cb);\n  }\n\n  return ret;\n}\n\nfunction doWrite(stream, state, writev, len, chunk, encoding, cb) {\n  state.writelen = len;\n  state.writecb = cb;\n  state.writing = true;\n  state.sync = true;\n  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);\n  state.sync = false;\n}\n\nfunction onwriteError(stream, state, sync, er, cb) {\n  --state.pendingcb;\n  if (sync) processNextTick(cb, er);else cb(er);\n\n  stream._writableState.errorEmitted = true;\n  stream.emit('error', er);\n}\n\nfunction onwriteStateUpdate(state) {\n  state.writing = false;\n  state.writecb = null;\n  state.length -= state.writelen;\n  state.writelen = 0;\n}\n\nfunction onwrite(stream, er) {\n  var state = stream._writableState;\n  var sync = state.sync;\n  var cb = state.writecb;\n\n  onwriteStateUpdate(state);\n\n  if (er) onwriteError(stream, state, sync, er, cb);else {\n    // Check if we're actually ready to finish, but don't emit yet\n    var finished = needFinish(state);\n\n    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {\n      clearBuffer(stream, state);\n    }\n\n    if (sync) {\n      /*<replacement>*/\n      asyncWrite(afterWrite, stream, state, finished, cb);\n      /*</replacement>*/\n    } else {\n        afterWrite(stream, state, finished, cb);\n      }\n  }\n}\n\nfunction afterWrite(stream, state, finished, cb) {\n  if (!finished) onwriteDrain(stream, state);\n  state.pendingcb--;\n  cb();\n  finishMaybe(stream, state);\n}\n\n// Must force callback to be called on nextTick, so that we don't\n// emit 'drain' before the write() consumer gets the 'false' return\n// value, and has a chance to attach a 'drain' listener.\nfunction onwriteDrain(stream, state) {\n  if (state.length === 0 && state.needDrain) {\n    state.needDrain = false;\n    stream.emit('drain');\n  }\n}\n\n// if there's something in the buffer waiting, then process it\nfunction clearBuffer(stream, state) {\n  state.bufferProcessing = true;\n  var entry = state.bufferedRequest;\n\n  if (stream._writev && entry && entry.next) {\n    // Fast case, write everything using _writev()\n    var l = state.bufferedRequestCount;\n    var buffer = new Array(l);\n    var holder = state.corkedRequestsFree;\n    holder.entry = entry;\n\n    var count = 0;\n    while (entry) {\n      buffer[count] = entry;\n      entry = entry.next;\n      count += 1;\n    }\n\n    doWrite(stream, state, true, state.length, buffer, '', holder.finish);\n\n    // doWrite is always async, defer these to save a bit of time\n    // as the hot path ends with doWrite\n    state.pendingcb++;\n    state.lastBufferedRequest = null;\n    state.corkedRequestsFree = holder.next;\n    holder.next = null;\n  } else {\n    // Slow case, write chunks one-by-one\n    while (entry) {\n      var chunk = entry.chunk;\n      var encoding = entry.encoding;\n      var cb = entry.callback;\n      var len = state.objectMode ? 1 : chunk.length;\n\n      doWrite(stream, state, false, len, chunk, encoding, cb);\n      entry = entry.next;\n      // if we didn't call the onwrite immediately, then\n      // it means that we need to wait until it does.\n      // also, that means that the chunk and cb are currently\n      // being processed, so move the buffer counter past them.\n      if (state.writing) {\n        break;\n      }\n    }\n\n    if (entry === null) state.lastBufferedRequest = null;\n  }\n\n  state.bufferedRequestCount = 0;\n  state.bufferedRequest = entry;\n  state.bufferProcessing = false;\n}\n\nWritable.prototype._write = function (chunk, encoding, cb) {\n  cb(new Error('not implemented'));\n};\n\nWritable.prototype._writev = null;\n\nWritable.prototype.end = function (chunk, encoding, cb) {\n  var state = this._writableState;\n\n  if (typeof chunk === 'function') {\n    cb = chunk;\n    chunk = null;\n    encoding = null;\n  } else if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);\n\n  // .end() fully uncorks\n  if (state.corked) {\n    state.corked = 1;\n    this.uncork();\n  }\n\n  // ignore unnecessary end() calls.\n  if (!state.ending && !state.finished) endWritable(this, state, cb);\n};\n\nfunction needFinish(state) {\n  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;\n}\n\nfunction prefinish(stream, state) {\n  if (!state.prefinished) {\n    state.prefinished = true;\n    stream.emit('prefinish');\n  }\n}\n\nfunction finishMaybe(stream, state) {\n  var need = needFinish(state);\n  if (need) {\n    if (state.pendingcb === 0) {\n      prefinish(stream, state);\n      state.finished = true;\n      stream.emit('finish');\n    } else {\n      prefinish(stream, state);\n    }\n  }\n  return need;\n}\n\nfunction endWritable(stream, state, cb) {\n  state.ending = true;\n  finishMaybe(stream, state);\n  if (cb) {\n    if (state.finished) processNextTick(cb);else stream.once('finish', cb);\n  }\n  state.ended = true;\n  stream.writable = false;\n}\n\n// It seems a linked list but it is not\n// there will be only 2 of these for each stream\nfunction CorkedRequest(state) {\n  var _this = this;\n\n  this.next = null;\n  this.entry = null;\n\n  this.finish = function (err) {\n    var entry = _this.entry;\n    _this.entry = null;\n    while (entry) {\n      var cb = entry.callback;\n      state.pendingcb--;\n      cb(err);\n      entry = entry.next;\n    }\n    if (state.corkedRequestsFree) {\n      state.corkedRequestsFree.next = _this;\n    } else {\n      state.corkedRequestsFree = _this;\n    }\n  };\n}",
+    "var Stream = (function (){\n  try {\n    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify\n  } catch(_){}\n}());\nexports = module.exports = require('./lib/_stream_readable.js');\nexports.Stream = Stream || exports;\nexports.Readable = exports;\nexports.Writable = require('./lib/_stream_writable.js');\nexports.Duplex = require('./lib/_stream_duplex.js');\nexports.Transform = require('./lib/_stream_transform.js');\nexports.PassThrough = require('./lib/_stream_passthrough.js');\n",
     "// Top level file is just a mixin of submodules & constants\n'use strict';\n\nvar assign    = require('./lib/utils/common').assign;\n\nvar deflate   = require('./lib/deflate');\nvar inflate   = require('./lib/inflate');\nvar constants = require('./lib/zlib/constants');\n\nvar pako = {};\n\nassign(pako, deflate, inflate, constants);\n\nmodule.exports = pako;\n",
-    "'use strict';\n\n\nvar zlib_deflate = require('./zlib/deflate');\nvar utils        = require('./utils/common');\nvar strings      = require('./utils/strings');\nvar msg          = require('./zlib/messages');\nvar ZStream      = require('./zlib/zstream');\n\nvar toString = Object.prototype.toString;\n\n/* Public constants ==========================================================*/\n/* ===========================================================================*/\n\nvar Z_NO_FLUSH      = 0;\nvar Z_FINISH        = 4;\n\nvar Z_OK            = 0;\nvar Z_STREAM_END    = 1;\nvar Z_SYNC_FLUSH    = 2;\n\nvar Z_DEFAULT_COMPRESSION = -1;\n\nvar Z_DEFAULT_STRATEGY    = 0;\n\nvar Z_DEFLATED  = 8;\n\n/* ===========================================================================*/\n\n\n/**\n * class Deflate\n *\n * Generic JS-style wrapper for zlib calls. If you don't need\n * streaming behaviour - use more simple functions: [[deflate]],\n * [[deflateRaw]] and [[gzip]].\n **/\n\n/* internal\n * Deflate.chunks -> Array\n *\n * Chunks of output data, if [[Deflate#onData]] not overriden.\n **/\n\n/**\n * Deflate.result -> Uint8Array|Array\n *\n * Compressed result, generated by default [[Deflate#onData]]\n * and [[Deflate#onEnd]] handlers. Filled after you push last chunk\n * (call [[Deflate#push]] with `Z_FINISH` / `true` param)  or if you\n * push a chunk with explicit flush (call [[Deflate#push]] with\n * `Z_SYNC_FLUSH` param).\n **/\n\n/**\n * Deflate.err -> Number\n *\n * Error code after deflate finished. 0 (Z_OK) on success.\n * You will not need it in real life, because deflate errors\n * are possible only on wrong options or bad `onData` / `onEnd`\n * custom handlers.\n **/\n\n/**\n * Deflate.msg -> String\n *\n * Error message, if [[Deflate.err]] != 0\n **/\n\n\n/**\n * new Deflate(options)\n * - options (Object): zlib deflate options.\n *\n * Creates new deflator instance with specified params. Throws exception\n * on bad params. Supported options:\n *\n * - `level`\n * - `windowBits`\n * - `memLevel`\n * - `strategy`\n * - `dictionary`\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information on these.\n *\n * Additional options, for internal needs:\n *\n * - `chunkSize` - size of generated data chunks (16K by default)\n * - `raw` (Boolean) - do raw deflate\n * - `gzip` (Boolean) - create gzip wrapper\n * - `to` (String) - if equal to 'string', then result will be \"binary string\"\n *    (each char code [0..255])\n * - `header` (Object) - custom header for gzip\n *   - `text` (Boolean) - true if compressed data believed to be text\n *   - `time` (Number) - modification time, unix timestamp\n *   - `os` (Number) - operation system code\n *   - `extra` (Array) - array of bytes with extra data (max 65536)\n *   - `name` (String) - file name (binary string)\n *   - `comment` (String) - comment (binary string)\n *   - `hcrc` (Boolean) - true if header crc should be added\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])\n *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);\n *\n * var deflate = new pako.Deflate({ level: 3});\n *\n * deflate.push(chunk1, false);\n * deflate.push(chunk2, true);  // true -> last chunk\n *\n * if (deflate.err) { throw new Error(deflate.err); }\n *\n * console.log(deflate.result);\n * ```\n **/\nfunction Deflate(options) {\n  if (!(this instanceof Deflate)) return new Deflate(options);\n\n  this.options = utils.assign({\n    level: Z_DEFAULT_COMPRESSION,\n    method: Z_DEFLATED,\n    chunkSize: 16384,\n    windowBits: 15,\n    memLevel: 8,\n    strategy: Z_DEFAULT_STRATEGY,\n    to: ''\n  }, options || {});\n\n  var opt = this.options;\n\n  if (opt.raw && (opt.windowBits > 0)) {\n    opt.windowBits = -opt.windowBits;\n  }\n\n  else if (opt.gzip && (opt.windowBits > 0) && (opt.windowBits < 16)) {\n    opt.windowBits += 16;\n  }\n\n  this.err    = 0;      // error code, if happens (0 = Z_OK)\n  this.msg    = '';     // error message\n  this.ended  = false;  // used to avoid multiple onEnd() calls\n  this.chunks = [];     // chunks of compressed data\n\n  this.strm = new ZStream();\n  this.strm.avail_out = 0;\n\n  var status = zlib_deflate.deflateInit2(\n    this.strm,\n    opt.level,\n    opt.method,\n    opt.windowBits,\n    opt.memLevel,\n    opt.strategy\n  );\n\n  if (status !== Z_OK) {\n    throw new Error(msg[status]);\n  }\n\n  if (opt.header) {\n    zlib_deflate.deflateSetHeader(this.strm, opt.header);\n  }\n\n  if (opt.dictionary) {\n    var dict;\n    // Convert data if needed\n    if (typeof opt.dictionary === 'string') {\n      // If we need to compress text, change encoding to utf8.\n      dict = strings.string2buf(opt.dictionary);\n    } else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {\n      dict = new Uint8Array(opt.dictionary);\n    } else {\n      dict = opt.dictionary;\n    }\n\n    status = zlib_deflate.deflateSetDictionary(this.strm, dict);\n\n    if (status !== Z_OK) {\n      throw new Error(msg[status]);\n    }\n\n    this._dict_set = true;\n  }\n}\n\n/**\n * Deflate#push(data[, mode]) -> Boolean\n * - data (Uint8Array|Array|ArrayBuffer|String): input data. Strings will be\n *   converted to utf8 byte sequence.\n * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.\n *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.\n *\n * Sends input data to deflate pipe, generating [[Deflate#onData]] calls with\n * new compressed chunks. Returns `true` on success. The last data block must have\n * mode Z_FINISH (or `true`). That will flush internal pending buffers and call\n * [[Deflate#onEnd]]. For interim explicit flushes (without ending the stream) you\n * can use mode Z_SYNC_FLUSH, keeping the compression context.\n *\n * On fail call [[Deflate#onEnd]] with error code and return false.\n *\n * We strongly recommend to use `Uint8Array` on input for best speed (output\n * array format is detected automatically). Also, don't skip last param and always\n * use the same type in your code (boolean or number). That will improve JS speed.\n *\n * For regular `Array`-s make sure all elements are [0..255].\n *\n * ##### Example\n *\n * ```javascript\n * push(chunk, false); // push one of data chunks\n * ...\n * push(chunk, true);  // push last chunk\n * ```\n **/\nDeflate.prototype.push = function (data, mode) {\n  var strm = this.strm;\n  var chunkSize = this.options.chunkSize;\n  var status, _mode;\n\n  if (this.ended) { return false; }\n\n  _mode = (mode === ~~mode) ? mode : ((mode === true) ? Z_FINISH : Z_NO_FLUSH);\n\n  // Convert data if needed\n  if (typeof data === 'string') {\n    // If we need to compress text, change encoding to utf8.\n    strm.input = strings.string2buf(data);\n  } else if (toString.call(data) === '[object ArrayBuffer]') {\n    strm.input = new Uint8Array(data);\n  } else {\n    strm.input = data;\n  }\n\n  strm.next_in = 0;\n  strm.avail_in = strm.input.length;\n\n  do {\n    if (strm.avail_out === 0) {\n      strm.output = new utils.Buf8(chunkSize);\n      strm.next_out = 0;\n      strm.avail_out = chunkSize;\n    }\n    status = zlib_deflate.deflate(strm, _mode);    /* no bad return value */\n\n    if (status !== Z_STREAM_END && status !== Z_OK) {\n      this.onEnd(status);\n      this.ended = true;\n      return false;\n    }\n    if (strm.avail_out === 0 || (strm.avail_in === 0 && (_mode === Z_FINISH || _mode === Z_SYNC_FLUSH))) {\n      if (this.options.to === 'string') {\n        this.onData(strings.buf2binstring(utils.shrinkBuf(strm.output, strm.next_out)));\n      } else {\n        this.onData(utils.shrinkBuf(strm.output, strm.next_out));\n      }\n    }\n  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== Z_STREAM_END);\n\n  // Finalize on the last chunk.\n  if (_mode === Z_FINISH) {\n    status = zlib_deflate.deflateEnd(this.strm);\n    this.onEnd(status);\n    this.ended = true;\n    return status === Z_OK;\n  }\n\n  // callback interim results if Z_SYNC_FLUSH.\n  if (_mode === Z_SYNC_FLUSH) {\n    this.onEnd(Z_OK);\n    strm.avail_out = 0;\n    return true;\n  }\n\n  return true;\n};\n\n\n/**\n * Deflate#onData(chunk) -> Void\n * - chunk (Uint8Array|Array|String): ouput data. Type of array depends\n *   on js engine support. When string output requested, each chunk\n *   will be string.\n *\n * By default, stores data blocks in `chunks[]` property and glue\n * those in `onEnd`. Override this handler, if you need another behaviour.\n **/\nDeflate.prototype.onData = function (chunk) {\n  this.chunks.push(chunk);\n};\n\n\n/**\n * Deflate#onEnd(status) -> Void\n * - status (Number): deflate status. 0 (Z_OK) on success,\n *   other if not.\n *\n * Called once after you tell deflate that the input stream is\n * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)\n * or if an error happened. By default - join collected chunks,\n * free memory and fill `results` / `err` properties.\n **/\nDeflate.prototype.onEnd = function (status) {\n  // On success - join\n  if (status === Z_OK) {\n    if (this.options.to === 'string') {\n      this.result = this.chunks.join('');\n    } else {\n      this.result = utils.flattenChunks(this.chunks);\n    }\n  }\n  this.chunks = [];\n  this.err = status;\n  this.msg = this.strm.msg;\n};\n\n\n/**\n * deflate(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to compress.\n * - options (Object): zlib deflate options.\n *\n * Compress `data` with deflate algorithm and `options`.\n *\n * Supported options are:\n *\n * - level\n * - windowBits\n * - memLevel\n * - strategy\n * - dictionary\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information on these.\n *\n * Sugar (options):\n *\n * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify\n *   negative windowBits implicitly.\n * - `to` (String) - if equal to 'string', then result will be \"binary string\"\n *    (each char code [0..255])\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , data = Uint8Array([1,2,3,4,5,6,7,8,9]);\n *\n * console.log(pako.deflate(data));\n * ```\n **/\nfunction deflate(input, options) {\n  var deflator = new Deflate(options);\n\n  deflator.push(input, true);\n\n  // That will never happens, if you don't cheat with options :)\n  if (deflator.err) { throw deflator.msg || msg[deflator.err]; }\n\n  return deflator.result;\n}\n\n\n/**\n * deflateRaw(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to compress.\n * - options (Object): zlib deflate options.\n *\n * The same as [[deflate]], but creates raw data, without wrapper\n * (header and adler32 crc).\n **/\nfunction deflateRaw(input, options) {\n  options = options || {};\n  options.raw = true;\n  return deflate(input, options);\n}\n\n\n/**\n * gzip(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to compress.\n * - options (Object): zlib deflate options.\n *\n * The same as [[deflate]], but create gzip wrapper instead of\n * deflate one.\n **/\nfunction gzip(input, options) {\n  options = options || {};\n  options.gzip = true;\n  return deflate(input, options);\n}\n\n\nexports.Deflate = Deflate;\nexports.deflate = deflate;\nexports.deflateRaw = deflateRaw;\nexports.gzip = gzip;\n",
-    "'use strict';\n\n\nvar zlib_inflate = require('./zlib/inflate');\nvar utils        = require('./utils/common');\nvar strings      = require('./utils/strings');\nvar c            = require('./zlib/constants');\nvar msg          = require('./zlib/messages');\nvar ZStream      = require('./zlib/zstream');\nvar GZheader     = require('./zlib/gzheader');\n\nvar toString = Object.prototype.toString;\n\n/**\n * class Inflate\n *\n * Generic JS-style wrapper for zlib calls. If you don't need\n * streaming behaviour - use more simple functions: [[inflate]]\n * and [[inflateRaw]].\n **/\n\n/* internal\n * inflate.chunks -> Array\n *\n * Chunks of output data, if [[Inflate#onData]] not overriden.\n **/\n\n/**\n * Inflate.result -> Uint8Array|Array|String\n *\n * Uncompressed result, generated by default [[Inflate#onData]]\n * and [[Inflate#onEnd]] handlers. Filled after you push last chunk\n * (call [[Inflate#push]] with `Z_FINISH` / `true` param) or if you\n * push a chunk with explicit flush (call [[Inflate#push]] with\n * `Z_SYNC_FLUSH` param).\n **/\n\n/**\n * Inflate.err -> Number\n *\n * Error code after inflate finished. 0 (Z_OK) on success.\n * Should be checked if broken data possible.\n **/\n\n/**\n * Inflate.msg -> String\n *\n * Error message, if [[Inflate.err]] != 0\n **/\n\n\n/**\n * new Inflate(options)\n * - options (Object): zlib inflate options.\n *\n * Creates new inflator instance with specified params. Throws exception\n * on bad params. Supported options:\n *\n * - `windowBits`\n * - `dictionary`\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information on these.\n *\n * Additional options, for internal needs:\n *\n * - `chunkSize` - size of generated data chunks (16K by default)\n * - `raw` (Boolean) - do raw inflate\n * - `to` (String) - if equal to 'string', then result will be converted\n *   from utf8 to utf16 (javascript) string. When string output requested,\n *   chunk length can differ from `chunkSize`, depending on content.\n *\n * By default, when no options set, autodetect deflate/gzip data format via\n * wrapper header.\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])\n *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);\n *\n * var inflate = new pako.Inflate({ level: 3});\n *\n * inflate.push(chunk1, false);\n * inflate.push(chunk2, true);  // true -> last chunk\n *\n * if (inflate.err) { throw new Error(inflate.err); }\n *\n * console.log(inflate.result);\n * ```\n **/\nfunction Inflate(options) {\n  if (!(this instanceof Inflate)) return new Inflate(options);\n\n  this.options = utils.assign({\n    chunkSize: 16384,\n    windowBits: 0,\n    to: ''\n  }, options || {});\n\n  var opt = this.options;\n\n  // Force window size for `raw` data, if not set directly,\n  // because we have no header for autodetect.\n  if (opt.raw && (opt.windowBits >= 0) && (opt.windowBits < 16)) {\n    opt.windowBits = -opt.windowBits;\n    if (opt.windowBits === 0) { opt.windowBits = -15; }\n  }\n\n  // If `windowBits` not defined (and mode not raw) - set autodetect flag for gzip/deflate\n  if ((opt.windowBits >= 0) && (opt.windowBits < 16) &&\n      !(options && options.windowBits)) {\n    opt.windowBits += 32;\n  }\n\n  // Gzip header has no info about windows size, we can do autodetect only\n  // for deflate. So, if window size not set, force it to max when gzip possible\n  if ((opt.windowBits > 15) && (opt.windowBits < 48)) {\n    // bit 3 (16) -> gzipped data\n    // bit 4 (32) -> autodetect gzip/deflate\n    if ((opt.windowBits & 15) === 0) {\n      opt.windowBits |= 15;\n    }\n  }\n\n  this.err    = 0;      // error code, if happens (0 = Z_OK)\n  this.msg    = '';     // error message\n  this.ended  = false;  // used to avoid multiple onEnd() calls\n  this.chunks = [];     // chunks of compressed data\n\n  this.strm   = new ZStream();\n  this.strm.avail_out = 0;\n\n  var status  = zlib_inflate.inflateInit2(\n    this.strm,\n    opt.windowBits\n  );\n\n  if (status !== c.Z_OK) {\n    throw new Error(msg[status]);\n  }\n\n  this.header = new GZheader();\n\n  zlib_inflate.inflateGetHeader(this.strm, this.header);\n}\n\n/**\n * Inflate#push(data[, mode]) -> Boolean\n * - data (Uint8Array|Array|ArrayBuffer|String): input data\n * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.\n *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.\n *\n * Sends input data to inflate pipe, generating [[Inflate#onData]] calls with\n * new output chunks. Returns `true` on success. The last data block must have\n * mode Z_FINISH (or `true`). That will flush internal pending buffers and call\n * [[Inflate#onEnd]]. For interim explicit flushes (without ending the stream) you\n * can use mode Z_SYNC_FLUSH, keeping the decompression context.\n *\n * On fail call [[Inflate#onEnd]] with error code and return false.\n *\n * We strongly recommend to use `Uint8Array` on input for best speed (output\n * format is detected automatically). Also, don't skip last param and always\n * use the same type in your code (boolean or number). That will improve JS speed.\n *\n * For regular `Array`-s make sure all elements are [0..255].\n *\n * ##### Example\n *\n * ```javascript\n * push(chunk, false); // push one of data chunks\n * ...\n * push(chunk, true);  // push last chunk\n * ```\n **/\nInflate.prototype.push = function (data, mode) {\n  var strm = this.strm;\n  var chunkSize = this.options.chunkSize;\n  var dictionary = this.options.dictionary;\n  var status, _mode;\n  var next_out_utf8, tail, utf8str;\n  var dict;\n\n  // Flag to properly process Z_BUF_ERROR on testing inflate call\n  // when we check that all output data was flushed.\n  var allowBufError = false;\n\n  if (this.ended) { return false; }\n  _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);\n\n  // Convert data if needed\n  if (typeof data === 'string') {\n    // Only binary strings can be decompressed on practice\n    strm.input = strings.binstring2buf(data);\n  } else if (toString.call(data) === '[object ArrayBuffer]') {\n    strm.input = new Uint8Array(data);\n  } else {\n    strm.input = data;\n  }\n\n  strm.next_in = 0;\n  strm.avail_in = strm.input.length;\n\n  do {\n    if (strm.avail_out === 0) {\n      strm.output = new utils.Buf8(chunkSize);\n      strm.next_out = 0;\n      strm.avail_out = chunkSize;\n    }\n\n    status = zlib_inflate.inflate(strm, c.Z_NO_FLUSH);    /* no bad return value */\n\n    if (status === c.Z_NEED_DICT && dictionary) {\n      // Convert data if needed\n      if (typeof dictionary === 'string') {\n        dict = strings.string2buf(dictionary);\n      } else if (toString.call(dictionary) === '[object ArrayBuffer]') {\n        dict = new Uint8Array(dictionary);\n      } else {\n        dict = dictionary;\n      }\n\n      status = zlib_inflate.inflateSetDictionary(this.strm, dict);\n\n    }\n\n    if (status === c.Z_BUF_ERROR && allowBufError === true) {\n      status = c.Z_OK;\n      allowBufError = false;\n    }\n\n    if (status !== c.Z_STREAM_END && status !== c.Z_OK) {\n      this.onEnd(status);\n      this.ended = true;\n      return false;\n    }\n\n    if (strm.next_out) {\n      if (strm.avail_out === 0 || status === c.Z_STREAM_END || (strm.avail_in === 0 && (_mode === c.Z_FINISH || _mode === c.Z_SYNC_FLUSH))) {\n\n        if (this.options.to === 'string') {\n\n          next_out_utf8 = strings.utf8border(strm.output, strm.next_out);\n\n          tail = strm.next_out - next_out_utf8;\n          utf8str = strings.buf2string(strm.output, next_out_utf8);\n\n          // move tail\n          strm.next_out = tail;\n          strm.avail_out = chunkSize - tail;\n          if (tail) { utils.arraySet(strm.output, strm.output, next_out_utf8, tail, 0); }\n\n          this.onData(utf8str);\n\n        } else {\n          this.onData(utils.shrinkBuf(strm.output, strm.next_out));\n        }\n      }\n    }\n\n    // When no more input data, we should check that internal inflate buffers\n    // are flushed. The only way to do it when avail_out = 0 - run one more\n    // inflate pass. But if output data not exists, inflate return Z_BUF_ERROR.\n    // Here we set flag to process this error properly.\n    //\n    // NOTE. Deflate does not return error in this case and does not needs such\n    // logic.\n    if (strm.avail_in === 0 && strm.avail_out === 0) {\n      allowBufError = true;\n    }\n\n  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== c.Z_STREAM_END);\n\n  if (status === c.Z_STREAM_END) {\n    _mode = c.Z_FINISH;\n  }\n\n  // Finalize on the last chunk.\n  if (_mode === c.Z_FINISH) {\n    status = zlib_inflate.inflateEnd(this.strm);\n    this.onEnd(status);\n    this.ended = true;\n    return status === c.Z_OK;\n  }\n\n  // callback interim results if Z_SYNC_FLUSH.\n  if (_mode === c.Z_SYNC_FLUSH) {\n    this.onEnd(c.Z_OK);\n    strm.avail_out = 0;\n    return true;\n  }\n\n  return true;\n};\n\n\n/**\n * Inflate#onData(chunk) -> Void\n * - chunk (Uint8Array|Array|String): ouput data. Type of array depends\n *   on js engine support. When string output requested, each chunk\n *   will be string.\n *\n * By default, stores data blocks in `chunks[]` property and glue\n * those in `onEnd`. Override this handler, if you need another behaviour.\n **/\nInflate.prototype.onData = function (chunk) {\n  this.chunks.push(chunk);\n};\n\n\n/**\n * Inflate#onEnd(status) -> Void\n * - status (Number): inflate status. 0 (Z_OK) on success,\n *   other if not.\n *\n * Called either after you tell inflate that the input stream is\n * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)\n * or if an error happened. By default - join collected chunks,\n * free memory and fill `results` / `err` properties.\n **/\nInflate.prototype.onEnd = function (status) {\n  // On success - join\n  if (status === c.Z_OK) {\n    if (this.options.to === 'string') {\n      // Glue & convert here, until we teach pako to send\n      // utf8 alligned strings to onData\n      this.result = this.chunks.join('');\n    } else {\n      this.result = utils.flattenChunks(this.chunks);\n    }\n  }\n  this.chunks = [];\n  this.err = status;\n  this.msg = this.strm.msg;\n};\n\n\n/**\n * inflate(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to decompress.\n * - options (Object): zlib inflate options.\n *\n * Decompress `data` with inflate/ungzip and `options`. Autodetect\n * format via wrapper header by default. That's why we don't provide\n * separate `ungzip` method.\n *\n * Supported options are:\n *\n * - windowBits\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information.\n *\n * Sugar (options):\n *\n * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify\n *   negative windowBits implicitly.\n * - `to` (String) - if equal to 'string', then result will be converted\n *   from utf8 to utf16 (javascript) string. When string output requested,\n *   chunk length can differ from `chunkSize`, depending on content.\n *\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , input = pako.deflate([1,2,3,4,5,6,7,8,9])\n *   , output;\n *\n * try {\n *   output = pako.inflate(input);\n * } catch (err)\n *   console.log(err);\n * }\n * ```\n **/\nfunction inflate(input, options) {\n  var inflator = new Inflate(options);\n\n  inflator.push(input, true);\n\n  // That will never happens, if you don't cheat with options :)\n  if (inflator.err) { throw inflator.msg || msg[inflator.err]; }\n\n  return inflator.result;\n}\n\n\n/**\n * inflateRaw(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to decompress.\n * - options (Object): zlib inflate options.\n *\n * The same as [[inflate]], but creates raw data, without wrapper\n * (header and adler32 crc).\n **/\nfunction inflateRaw(input, options) {\n  options = options || {};\n  options.raw = true;\n  return inflate(input, options);\n}\n\n\n/**\n * ungzip(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to decompress.\n * - options (Object): zlib inflate options.\n *\n * Just shortcut to [[inflate]], because it autodetects format\n * by header.content. Done for convenience.\n **/\n\n\nexports.Inflate = Inflate;\nexports.inflate = inflate;\nexports.inflateRaw = inflateRaw;\nexports.ungzip  = inflate;\n",
+    "'use strict';\n\n\nvar zlib_deflate = require('./zlib/deflate');\nvar utils        = require('./utils/common');\nvar strings      = require('./utils/strings');\nvar msg          = require('./zlib/messages');\nvar ZStream      = require('./zlib/zstream');\n\nvar toString = Object.prototype.toString;\n\n/* Public constants ==========================================================*/\n/* ===========================================================================*/\n\nvar Z_NO_FLUSH      = 0;\nvar Z_FINISH        = 4;\n\nvar Z_OK            = 0;\nvar Z_STREAM_END    = 1;\nvar Z_SYNC_FLUSH    = 2;\n\nvar Z_DEFAULT_COMPRESSION = -1;\n\nvar Z_DEFAULT_STRATEGY    = 0;\n\nvar Z_DEFLATED  = 8;\n\n/* ===========================================================================*/\n\n\n/**\n * class Deflate\n *\n * Generic JS-style wrapper for zlib calls. If you don't need\n * streaming behaviour - use more simple functions: [[deflate]],\n * [[deflateRaw]] and [[gzip]].\n **/\n\n/* internal\n * Deflate.chunks -> Array\n *\n * Chunks of output data, if [[Deflate#onData]] not overriden.\n **/\n\n/**\n * Deflate.result -> Uint8Array|Array\n *\n * Compressed result, generated by default [[Deflate#onData]]\n * and [[Deflate#onEnd]] handlers. Filled after you push last chunk\n * (call [[Deflate#push]] with `Z_FINISH` / `true` param)  or if you\n * push a chunk with explicit flush (call [[Deflate#push]] with\n * `Z_SYNC_FLUSH` param).\n **/\n\n/**\n * Deflate.err -> Number\n *\n * Error code after deflate finished. 0 (Z_OK) on success.\n * You will not need it in real life, because deflate errors\n * are possible only on wrong options or bad `onData` / `onEnd`\n * custom handlers.\n **/\n\n/**\n * Deflate.msg -> String\n *\n * Error message, if [[Deflate.err]] != 0\n **/\n\n\n/**\n * new Deflate(options)\n * - options (Object): zlib deflate options.\n *\n * Creates new deflator instance with specified params. Throws exception\n * on bad params. Supported options:\n *\n * - `level`\n * - `windowBits`\n * - `memLevel`\n * - `strategy`\n * - `dictionary`\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information on these.\n *\n * Additional options, for internal needs:\n *\n * - `chunkSize` - size of generated data chunks (16K by default)\n * - `raw` (Boolean) - do raw deflate\n * - `gzip` (Boolean) - create gzip wrapper\n * - `to` (String) - if equal to 'string', then result will be \"binary string\"\n *    (each char code [0..255])\n * - `header` (Object) - custom header for gzip\n *   - `text` (Boolean) - true if compressed data believed to be text\n *   - `time` (Number) - modification time, unix timestamp\n *   - `os` (Number) - operation system code\n *   - `extra` (Array) - array of bytes with extra data (max 65536)\n *   - `name` (String) - file name (binary string)\n *   - `comment` (String) - comment (binary string)\n *   - `hcrc` (Boolean) - true if header crc should be added\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])\n *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);\n *\n * var deflate = new pako.Deflate({ level: 3});\n *\n * deflate.push(chunk1, false);\n * deflate.push(chunk2, true);  // true -> last chunk\n *\n * if (deflate.err) { throw new Error(deflate.err); }\n *\n * console.log(deflate.result);\n * ```\n **/\nfunction Deflate(options) {\n  if (!(this instanceof Deflate)) return new Deflate(options);\n\n  this.options = utils.assign({\n    level: Z_DEFAULT_COMPRESSION,\n    method: Z_DEFLATED,\n    chunkSize: 16384,\n    windowBits: 15,\n    memLevel: 8,\n    strategy: Z_DEFAULT_STRATEGY,\n    to: ''\n  }, options || {});\n\n  var opt = this.options;\n\n  if (opt.raw && (opt.windowBits > 0)) {\n    opt.windowBits = -opt.windowBits;\n  }\n\n  else if (opt.gzip && (opt.windowBits > 0) && (opt.windowBits < 16)) {\n    opt.windowBits += 16;\n  }\n\n  this.err    = 0;      // error code, if happens (0 = Z_OK)\n  this.msg    = '';     // error message\n  this.ended  = false;  // used to avoid multiple onEnd() calls\n  this.chunks = [];     // chunks of compressed data\n\n  this.strm = new ZStream();\n  this.strm.avail_out = 0;\n\n  var status = zlib_deflate.deflateInit2(\n    this.strm,\n    opt.level,\n    opt.method,\n    opt.windowBits,\n    opt.memLevel,\n    opt.strategy\n  );\n\n  if (status !== Z_OK) {\n    throw new Error(msg[status]);\n  }\n\n  if (opt.header) {\n    zlib_deflate.deflateSetHeader(this.strm, opt.header);\n  }\n\n  if (opt.dictionary) {\n    var dict;\n    // Convert data if needed\n    if (typeof opt.dictionary === 'string') {\n      // If we need to compress text, change encoding to utf8.\n      dict = strings.string2buf(opt.dictionary);\n    } else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {\n      dict = new Uint8Array(opt.dictionary);\n    } else {\n      dict = opt.dictionary;\n    }\n\n    status = zlib_deflate.deflateSetDictionary(this.strm, dict);\n\n    if (status !== Z_OK) {\n      throw new Error(msg[status]);\n    }\n\n    this._dict_set = true;\n  }\n}\n\n/**\n * Deflate#push(data[, mode]) -> Boolean\n * - data (Uint8Array|Array|ArrayBuffer|String): input data. Strings will be\n *   converted to utf8 byte sequence.\n * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.\n *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.\n *\n * Sends input data to deflate pipe, generating [[Deflate#onData]] calls with\n * new compressed chunks. Returns `true` on success. The last data block must have\n * mode Z_FINISH (or `true`). That will flush internal pending buffers and call\n * [[Deflate#onEnd]]. For interim explicit flushes (without ending the stream) you\n * can use mode Z_SYNC_FLUSH, keeping the compression context.\n *\n * On fail call [[Deflate#onEnd]] with error code and return false.\n *\n * We strongly recommend to use `Uint8Array` on input for best speed (output\n * array format is detected automatically). Also, don't skip last param and always\n * use the same type in your code (boolean or number). That will improve JS speed.\n *\n * For regular `Array`-s make sure all elements are [0..255].\n *\n * ##### Example\n *\n * ```javascript\n * push(chunk, false); // push one of data chunks\n * ...\n * push(chunk, true);  // push last chunk\n * ```\n **/\nDeflate.prototype.push = function (data, mode) {\n  var strm = this.strm;\n  var chunkSize = this.options.chunkSize;\n  var status, _mode;\n\n  if (this.ended) { return false; }\n\n  _mode = (mode === ~~mode) ? mode : ((mode === true) ? Z_FINISH : Z_NO_FLUSH);\n\n  // Convert data if needed\n  if (typeof data === 'string') {\n    // If we need to compress text, change encoding to utf8.\n    strm.input = strings.string2buf(data);\n  } else if (toString.call(data) === '[object ArrayBuffer]') {\n    strm.input = new Uint8Array(data);\n  } else {\n    strm.input = data;\n  }\n\n  strm.next_in = 0;\n  strm.avail_in = strm.input.length;\n\n  do {\n    if (strm.avail_out === 0) {\n      strm.output = new utils.Buf8(chunkSize);\n      strm.next_out = 0;\n      strm.avail_out = chunkSize;\n    }\n    status = zlib_deflate.deflate(strm, _mode);    /* no bad return value */\n\n    if (status !== Z_STREAM_END && status !== Z_OK) {\n      this.onEnd(status);\n      this.ended = true;\n      return false;\n    }\n    if (strm.avail_out === 0 || (strm.avail_in === 0 && (_mode === Z_FINISH || _mode === Z_SYNC_FLUSH))) {\n      if (this.options.to === 'string') {\n        this.onData(strings.buf2binstring(utils.shrinkBuf(strm.output, strm.next_out)));\n      } else {\n        this.onData(utils.shrinkBuf(strm.output, strm.next_out));\n      }\n    }\n  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== Z_STREAM_END);\n\n  // Finalize on the last chunk.\n  if (_mode === Z_FINISH) {\n    status = zlib_deflate.deflateEnd(this.strm);\n    this.onEnd(status);\n    this.ended = true;\n    return status === Z_OK;\n  }\n\n  // callback interim results if Z_SYNC_FLUSH.\n  if (_mode === Z_SYNC_FLUSH) {\n    this.onEnd(Z_OK);\n    strm.avail_out = 0;\n    return true;\n  }\n\n  return true;\n};\n\n\n/**\n * Deflate#onData(chunk) -> Void\n * - chunk (Uint8Array|Array|String): ouput data. Type of array depends\n *   on js engine support. When string output requested, each chunk\n *   will be string.\n *\n * By default, stores data blocks in `chunks[]` property and glue\n * those in `onEnd`. Override this handler, if you need another behaviour.\n **/\nDeflate.prototype.onData = function (chunk) {\n  this.chunks.push(chunk);\n};\n\n\n/**\n * Deflate#onEnd(status) -> Void\n * - status (Number): deflate status. 0 (Z_OK) on success,\n *   other if not.\n *\n * Called once after you tell deflate that the input stream is\n * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)\n * or if an error happened. By default - join collected chunks,\n * free memory and fill `results` / `err` properties.\n **/\nDeflate.prototype.onEnd = function (status) {\n  // On success - join\n  if (status === Z_OK) {\n    if (this.options.to === 'string') {\n      this.result = this.chunks.join('');\n    } else {\n      this.result = utils.flattenChunks(this.chunks);\n    }\n  }\n  this.chunks = [];\n  this.err = status;\n  this.msg = this.strm.msg;\n};\n\n\n/**\n * deflate(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to compress.\n * - options (Object): zlib deflate options.\n *\n * Compress `data` with deflate algorithm and `options`.\n *\n * Supported options are:\n *\n * - level\n * - windowBits\n * - memLevel\n * - strategy\n * - dictionary\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information on these.\n *\n * Sugar (options):\n *\n * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify\n *   negative windowBits implicitly.\n * - `to` (String) - if equal to 'string', then result will be \"binary string\"\n *    (each char code [0..255])\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , data = Uint8Array([1,2,3,4,5,6,7,8,9]);\n *\n * console.log(pako.deflate(data));\n * ```\n **/\nfunction deflate(input, options) {\n  var deflator = new Deflate(options);\n\n  deflator.push(input, true);\n\n  // That will never happens, if you don't cheat with options :)\n  if (deflator.err) { throw deflator.msg; }\n\n  return deflator.result;\n}\n\n\n/**\n * deflateRaw(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to compress.\n * - options (Object): zlib deflate options.\n *\n * The same as [[deflate]], but creates raw data, without wrapper\n * (header and adler32 crc).\n **/\nfunction deflateRaw(input, options) {\n  options = options || {};\n  options.raw = true;\n  return deflate(input, options);\n}\n\n\n/**\n * gzip(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to compress.\n * - options (Object): zlib deflate options.\n *\n * The same as [[deflate]], but create gzip wrapper instead of\n * deflate one.\n **/\nfunction gzip(input, options) {\n  options = options || {};\n  options.gzip = true;\n  return deflate(input, options);\n}\n\n\nexports.Deflate = Deflate;\nexports.deflate = deflate;\nexports.deflateRaw = deflateRaw;\nexports.gzip = gzip;\n",
+    "'use strict';\n\n\nvar zlib_inflate = require('./zlib/inflate');\nvar utils        = require('./utils/common');\nvar strings      = require('./utils/strings');\nvar c            = require('./zlib/constants');\nvar msg          = require('./zlib/messages');\nvar ZStream      = require('./zlib/zstream');\nvar GZheader     = require('./zlib/gzheader');\n\nvar toString = Object.prototype.toString;\n\n/**\n * class Inflate\n *\n * Generic JS-style wrapper for zlib calls. If you don't need\n * streaming behaviour - use more simple functions: [[inflate]]\n * and [[inflateRaw]].\n **/\n\n/* internal\n * inflate.chunks -> Array\n *\n * Chunks of output data, if [[Inflate#onData]] not overriden.\n **/\n\n/**\n * Inflate.result -> Uint8Array|Array|String\n *\n * Uncompressed result, generated by default [[Inflate#onData]]\n * and [[Inflate#onEnd]] handlers. Filled after you push last chunk\n * (call [[Inflate#push]] with `Z_FINISH` / `true` param) or if you\n * push a chunk with explicit flush (call [[Inflate#push]] with\n * `Z_SYNC_FLUSH` param).\n **/\n\n/**\n * Inflate.err -> Number\n *\n * Error code after inflate finished. 0 (Z_OK) on success.\n * Should be checked if broken data possible.\n **/\n\n/**\n * Inflate.msg -> String\n *\n * Error message, if [[Inflate.err]] != 0\n **/\n\n\n/**\n * new Inflate(options)\n * - options (Object): zlib inflate options.\n *\n * Creates new inflator instance with specified params. Throws exception\n * on bad params. Supported options:\n *\n * - `windowBits`\n * - `dictionary`\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information on these.\n *\n * Additional options, for internal needs:\n *\n * - `chunkSize` - size of generated data chunks (16K by default)\n * - `raw` (Boolean) - do raw inflate\n * - `to` (String) - if equal to 'string', then result will be converted\n *   from utf8 to utf16 (javascript) string. When string output requested,\n *   chunk length can differ from `chunkSize`, depending on content.\n *\n * By default, when no options set, autodetect deflate/gzip data format via\n * wrapper header.\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])\n *   , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);\n *\n * var inflate = new pako.Inflate({ level: 3});\n *\n * inflate.push(chunk1, false);\n * inflate.push(chunk2, true);  // true -> last chunk\n *\n * if (inflate.err) { throw new Error(inflate.err); }\n *\n * console.log(inflate.result);\n * ```\n **/\nfunction Inflate(options) {\n  if (!(this instanceof Inflate)) return new Inflate(options);\n\n  this.options = utils.assign({\n    chunkSize: 16384,\n    windowBits: 0,\n    to: ''\n  }, options || {});\n\n  var opt = this.options;\n\n  // Force window size for `raw` data, if not set directly,\n  // because we have no header for autodetect.\n  if (opt.raw && (opt.windowBits >= 0) && (opt.windowBits < 16)) {\n    opt.windowBits = -opt.windowBits;\n    if (opt.windowBits === 0) { opt.windowBits = -15; }\n  }\n\n  // If `windowBits` not defined (and mode not raw) - set autodetect flag for gzip/deflate\n  if ((opt.windowBits >= 0) && (opt.windowBits < 16) &&\n      !(options && options.windowBits)) {\n    opt.windowBits += 32;\n  }\n\n  // Gzip header has no info about windows size, we can do autodetect only\n  // for deflate. So, if window size not set, force it to max when gzip possible\n  if ((opt.windowBits > 15) && (opt.windowBits < 48)) {\n    // bit 3 (16) -> gzipped data\n    // bit 4 (32) -> autodetect gzip/deflate\n    if ((opt.windowBits & 15) === 0) {\n      opt.windowBits |= 15;\n    }\n  }\n\n  this.err    = 0;      // error code, if happens (0 = Z_OK)\n  this.msg    = '';     // error message\n  this.ended  = false;  // used to avoid multiple onEnd() calls\n  this.chunks = [];     // chunks of compressed data\n\n  this.strm   = new ZStream();\n  this.strm.avail_out = 0;\n\n  var status  = zlib_inflate.inflateInit2(\n    this.strm,\n    opt.windowBits\n  );\n\n  if (status !== c.Z_OK) {\n    throw new Error(msg[status]);\n  }\n\n  this.header = new GZheader();\n\n  zlib_inflate.inflateGetHeader(this.strm, this.header);\n}\n\n/**\n * Inflate#push(data[, mode]) -> Boolean\n * - data (Uint8Array|Array|ArrayBuffer|String): input data\n * - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.\n *   See constants. Skipped or `false` means Z_NO_FLUSH, `true` meansh Z_FINISH.\n *\n * Sends input data to inflate pipe, generating [[Inflate#onData]] calls with\n * new output chunks. Returns `true` on success. The last data block must have\n * mode Z_FINISH (or `true`). That will flush internal pending buffers and call\n * [[Inflate#onEnd]]. For interim explicit flushes (without ending the stream) you\n * can use mode Z_SYNC_FLUSH, keeping the decompression context.\n *\n * On fail call [[Inflate#onEnd]] with error code and return false.\n *\n * We strongly recommend to use `Uint8Array` on input for best speed (output\n * format is detected automatically). Also, don't skip last param and always\n * use the same type in your code (boolean or number). That will improve JS speed.\n *\n * For regular `Array`-s make sure all elements are [0..255].\n *\n * ##### Example\n *\n * ```javascript\n * push(chunk, false); // push one of data chunks\n * ...\n * push(chunk, true);  // push last chunk\n * ```\n **/\nInflate.prototype.push = function (data, mode) {\n  var strm = this.strm;\n  var chunkSize = this.options.chunkSize;\n  var dictionary = this.options.dictionary;\n  var status, _mode;\n  var next_out_utf8, tail, utf8str;\n  var dict;\n\n  // Flag to properly process Z_BUF_ERROR on testing inflate call\n  // when we check that all output data was flushed.\n  var allowBufError = false;\n\n  if (this.ended) { return false; }\n  _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);\n\n  // Convert data if needed\n  if (typeof data === 'string') {\n    // Only binary strings can be decompressed on practice\n    strm.input = strings.binstring2buf(data);\n  } else if (toString.call(data) === '[object ArrayBuffer]') {\n    strm.input = new Uint8Array(data);\n  } else {\n    strm.input = data;\n  }\n\n  strm.next_in = 0;\n  strm.avail_in = strm.input.length;\n\n  do {\n    if (strm.avail_out === 0) {\n      strm.output = new utils.Buf8(chunkSize);\n      strm.next_out = 0;\n      strm.avail_out = chunkSize;\n    }\n\n    status = zlib_inflate.inflate(strm, c.Z_NO_FLUSH);    /* no bad return value */\n\n    if (status === c.Z_NEED_DICT && dictionary) {\n      // Convert data if needed\n      if (typeof dictionary === 'string') {\n        dict = strings.string2buf(dictionary);\n      } else if (toString.call(dictionary) === '[object ArrayBuffer]') {\n        dict = new Uint8Array(dictionary);\n      } else {\n        dict = dictionary;\n      }\n\n      status = zlib_inflate.inflateSetDictionary(this.strm, dict);\n\n    }\n\n    if (status === c.Z_BUF_ERROR && allowBufError === true) {\n      status = c.Z_OK;\n      allowBufError = false;\n    }\n\n    if (status !== c.Z_STREAM_END && status !== c.Z_OK) {\n      this.onEnd(status);\n      this.ended = true;\n      return false;\n    }\n\n    if (strm.next_out) {\n      if (strm.avail_out === 0 || status === c.Z_STREAM_END || (strm.avail_in === 0 && (_mode === c.Z_FINISH || _mode === c.Z_SYNC_FLUSH))) {\n\n        if (this.options.to === 'string') {\n\n          next_out_utf8 = strings.utf8border(strm.output, strm.next_out);\n\n          tail = strm.next_out - next_out_utf8;\n          utf8str = strings.buf2string(strm.output, next_out_utf8);\n\n          // move tail\n          strm.next_out = tail;\n          strm.avail_out = chunkSize - tail;\n          if (tail) { utils.arraySet(strm.output, strm.output, next_out_utf8, tail, 0); }\n\n          this.onData(utf8str);\n\n        } else {\n          this.onData(utils.shrinkBuf(strm.output, strm.next_out));\n        }\n      }\n    }\n\n    // When no more input data, we should check that internal inflate buffers\n    // are flushed. The only way to do it when avail_out = 0 - run one more\n    // inflate pass. But if output data not exists, inflate return Z_BUF_ERROR.\n    // Here we set flag to process this error properly.\n    //\n    // NOTE. Deflate does not return error in this case and does not needs such\n    // logic.\n    if (strm.avail_in === 0 && strm.avail_out === 0) {\n      allowBufError = true;\n    }\n\n  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== c.Z_STREAM_END);\n\n  if (status === c.Z_STREAM_END) {\n    _mode = c.Z_FINISH;\n  }\n\n  // Finalize on the last chunk.\n  if (_mode === c.Z_FINISH) {\n    status = zlib_inflate.inflateEnd(this.strm);\n    this.onEnd(status);\n    this.ended = true;\n    return status === c.Z_OK;\n  }\n\n  // callback interim results if Z_SYNC_FLUSH.\n  if (_mode === c.Z_SYNC_FLUSH) {\n    this.onEnd(c.Z_OK);\n    strm.avail_out = 0;\n    return true;\n  }\n\n  return true;\n};\n\n\n/**\n * Inflate#onData(chunk) -> Void\n * - chunk (Uint8Array|Array|String): ouput data. Type of array depends\n *   on js engine support. When string output requested, each chunk\n *   will be string.\n *\n * By default, stores data blocks in `chunks[]` property and glue\n * those in `onEnd`. Override this handler, if you need another behaviour.\n **/\nInflate.prototype.onData = function (chunk) {\n  this.chunks.push(chunk);\n};\n\n\n/**\n * Inflate#onEnd(status) -> Void\n * - status (Number): inflate status. 0 (Z_OK) on success,\n *   other if not.\n *\n * Called either after you tell inflate that the input stream is\n * complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)\n * or if an error happened. By default - join collected chunks,\n * free memory and fill `results` / `err` properties.\n **/\nInflate.prototype.onEnd = function (status) {\n  // On success - join\n  if (status === c.Z_OK) {\n    if (this.options.to === 'string') {\n      // Glue & convert here, until we teach pako to send\n      // utf8 alligned strings to onData\n      this.result = this.chunks.join('');\n    } else {\n      this.result = utils.flattenChunks(this.chunks);\n    }\n  }\n  this.chunks = [];\n  this.err = status;\n  this.msg = this.strm.msg;\n};\n\n\n/**\n * inflate(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to decompress.\n * - options (Object): zlib inflate options.\n *\n * Decompress `data` with inflate/ungzip and `options`. Autodetect\n * format via wrapper header by default. That's why we don't provide\n * separate `ungzip` method.\n *\n * Supported options are:\n *\n * - windowBits\n *\n * [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)\n * for more information.\n *\n * Sugar (options):\n *\n * - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify\n *   negative windowBits implicitly.\n * - `to` (String) - if equal to 'string', then result will be converted\n *   from utf8 to utf16 (javascript) string. When string output requested,\n *   chunk length can differ from `chunkSize`, depending on content.\n *\n *\n * ##### Example:\n *\n * ```javascript\n * var pako = require('pako')\n *   , input = pako.deflate([1,2,3,4,5,6,7,8,9])\n *   , output;\n *\n * try {\n *   output = pako.inflate(input);\n * } catch (err)\n *   console.log(err);\n * }\n * ```\n **/\nfunction inflate(input, options) {\n  var inflator = new Inflate(options);\n\n  inflator.push(input, true);\n\n  // That will never happens, if you don't cheat with options :)\n  if (inflator.err) { throw inflator.msg; }\n\n  return inflator.result;\n}\n\n\n/**\n * inflateRaw(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to decompress.\n * - options (Object): zlib inflate options.\n *\n * The same as [[inflate]], but creates raw data, without wrapper\n * (header and adler32 crc).\n **/\nfunction inflateRaw(input, options) {\n  options = options || {};\n  options.raw = true;\n  return inflate(input, options);\n}\n\n\n/**\n * ungzip(data[, options]) -> Uint8Array|Array|String\n * - data (Uint8Array|Array|String): input data to decompress.\n * - options (Object): zlib inflate options.\n *\n * Just shortcut to [[inflate]], because it autodetects format\n * by header.content. Done for convenience.\n **/\n\n\nexports.Inflate = Inflate;\nexports.inflate = inflate;\nexports.inflateRaw = inflateRaw;\nexports.ungzip  = inflate;\n",
     "'use strict';\n\n\nvar TYPED_OK =  (typeof Uint8Array !== 'undefined') &&\n                (typeof Uint16Array !== 'undefined') &&\n                (typeof Int32Array !== 'undefined');\n\n\nexports.assign = function (obj /*from1, from2, from3, ...*/) {\n  var sources = Array.prototype.slice.call(arguments, 1);\n  while (sources.length) {\n    var source = sources.shift();\n    if (!source) { continue; }\n\n    if (typeof source !== 'object') {\n      throw new TypeError(source + 'must be non-object');\n    }\n\n    for (var p in source) {\n      if (source.hasOwnProperty(p)) {\n        obj[p] = source[p];\n      }\n    }\n  }\n\n  return obj;\n};\n\n\n// reduce buffer size, avoiding mem copy\nexports.shrinkBuf = function (buf, size) {\n  if (buf.length === size) { return buf; }\n  if (buf.subarray) { return buf.subarray(0, size); }\n  buf.length = size;\n  return buf;\n};\n\n\nvar fnTyped = {\n  arraySet: function (dest, src, src_offs, len, dest_offs) {\n    if (src.subarray && dest.subarray) {\n      dest.set(src.subarray(src_offs, src_offs + len), dest_offs);\n      return;\n    }\n    // Fallback to ordinary array\n    for (var i = 0; i < len; i++) {\n      dest[dest_offs + i] = src[src_offs + i];\n    }\n  },\n  // Join array of chunks to single array.\n  flattenChunks: function (chunks) {\n    var i, l, len, pos, chunk, result;\n\n    // calculate data length\n    len = 0;\n    for (i = 0, l = chunks.length; i < l; i++) {\n      len += chunks[i].length;\n    }\n\n    // join chunks\n    result = new Uint8Array(len);\n    pos = 0;\n    for (i = 0, l = chunks.length; i < l; i++) {\n      chunk = chunks[i];\n      result.set(chunk, pos);\n      pos += chunk.length;\n    }\n\n    return result;\n  }\n};\n\nvar fnUntyped = {\n  arraySet: function (dest, src, src_offs, len, dest_offs) {\n    for (var i = 0; i < len; i++) {\n      dest[dest_offs + i] = src[src_offs + i];\n    }\n  },\n  // Join array of chunks to single array.\n  flattenChunks: function (chunks) {\n    return [].concat.apply([], chunks);\n  }\n};\n\n\n// Enable/Disable typed arrays use, for testing\n//\nexports.setTyped = function (on) {\n  if (on) {\n    exports.Buf8  = Uint8Array;\n    exports.Buf16 = Uint16Array;\n    exports.Buf32 = Int32Array;\n    exports.assign(exports, fnTyped);\n  } else {\n    exports.Buf8  = Array;\n    exports.Buf16 = Array;\n    exports.Buf32 = Array;\n    exports.assign(exports, fnUntyped);\n  }\n};\n\nexports.setTyped(TYPED_OK);\n",
     "// String encode/decode helpers\n'use strict';\n\n\nvar utils = require('./common');\n\n\n// Quick check if we can use fast array to bin string conversion\n//\n// - apply(Array) can fail on Android 2.2\n// - apply(Uint8Array) can fail on iOS 5.1 Safary\n//\nvar STR_APPLY_OK = true;\nvar STR_APPLY_UIA_OK = true;\n\ntry { String.fromCharCode.apply(null, [ 0 ]); } catch (__) { STR_APPLY_OK = false; }\ntry { String.fromCharCode.apply(null, new Uint8Array(1)); } catch (__) { STR_APPLY_UIA_OK = false; }\n\n\n// Table with utf8 lengths (calculated by first byte of sequence)\n// Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,\n// because max possible codepoint is 0x10ffff\nvar _utf8len = new utils.Buf8(256);\nfor (var q = 0; q < 256; q++) {\n  _utf8len[q] = (q >= 252 ? 6 : q >= 248 ? 5 : q >= 240 ? 4 : q >= 224 ? 3 : q >= 192 ? 2 : 1);\n}\n_utf8len[254] = _utf8len[254] = 1; // Invalid sequence start\n\n\n// convert string to array (typed, when possible)\nexports.string2buf = function (str) {\n  var buf, c, c2, m_pos, i, str_len = str.length, buf_len = 0;\n\n  // count binary size\n  for (m_pos = 0; m_pos < str_len; m_pos++) {\n    c = str.charCodeAt(m_pos);\n    if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {\n      c2 = str.charCodeAt(m_pos + 1);\n      if ((c2 & 0xfc00) === 0xdc00) {\n        c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);\n        m_pos++;\n      }\n    }\n    buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;\n  }\n\n  // allocate buffer\n  buf = new utils.Buf8(buf_len);\n\n  // convert\n  for (i = 0, m_pos = 0; i < buf_len; m_pos++) {\n    c = str.charCodeAt(m_pos);\n    if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {\n      c2 = str.charCodeAt(m_pos + 1);\n      if ((c2 & 0xfc00) === 0xdc00) {\n        c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);\n        m_pos++;\n      }\n    }\n    if (c < 0x80) {\n      /* one byte */\n      buf[i++] = c;\n    } else if (c < 0x800) {\n      /* two bytes */\n      buf[i++] = 0xC0 | (c >>> 6);\n      buf[i++] = 0x80 | (c & 0x3f);\n    } else if (c < 0x10000) {\n      /* three bytes */\n      buf[i++] = 0xE0 | (c >>> 12);\n      buf[i++] = 0x80 | (c >>> 6 & 0x3f);\n      buf[i++] = 0x80 | (c & 0x3f);\n    } else {\n      /* four bytes */\n      buf[i++] = 0xf0 | (c >>> 18);\n      buf[i++] = 0x80 | (c >>> 12 & 0x3f);\n      buf[i++] = 0x80 | (c >>> 6 & 0x3f);\n      buf[i++] = 0x80 | (c & 0x3f);\n    }\n  }\n\n  return buf;\n};\n\n// Helper (used in 2 places)\nfunction buf2binstring(buf, len) {\n  // use fallback for big arrays to avoid stack overflow\n  if (len < 65537) {\n    if ((buf.subarray && STR_APPLY_UIA_OK) || (!buf.subarray && STR_APPLY_OK)) {\n      return String.fromCharCode.apply(null, utils.shrinkBuf(buf, len));\n    }\n  }\n\n  var result = '';\n  for (var i = 0; i < len; i++) {\n    result += String.fromCharCode(buf[i]);\n  }\n  return result;\n}\n\n\n// Convert byte array to binary string\nexports.buf2binstring = function (buf) {\n  return buf2binstring(buf, buf.length);\n};\n\n\n// Convert binary string (typed, when possible)\nexports.binstring2buf = function (str) {\n  var buf = new utils.Buf8(str.length);\n  for (var i = 0, len = buf.length; i < len; i++) {\n    buf[i] = str.charCodeAt(i);\n  }\n  return buf;\n};\n\n\n// convert array to string\nexports.buf2string = function (buf, max) {\n  var i, out, c, c_len;\n  var len = max || buf.length;\n\n  // Reserve max possible length (2 words per char)\n  // NB: by unknown reasons, Array is significantly faster for\n  //     String.fromCharCode.apply than Uint16Array.\n  var utf16buf = new Array(len * 2);\n\n  for (out = 0, i = 0; i < len;) {\n    c = buf[i++];\n    // quick process ascii\n    if (c < 0x80) { utf16buf[out++] = c; continue; }\n\n    c_len = _utf8len[c];\n    // skip 5 & 6 byte codes\n    if (c_len > 4) { utf16buf[out++] = 0xfffd; i += c_len - 1; continue; }\n\n    // apply mask on first byte\n    c &= c_len === 2 ? 0x1f : c_len === 3 ? 0x0f : 0x07;\n    // join the rest\n    while (c_len > 1 && i < len) {\n      c = (c << 6) | (buf[i++] & 0x3f);\n      c_len--;\n    }\n\n    // terminated by end of string?\n    if (c_len > 1) { utf16buf[out++] = 0xfffd; continue; }\n\n    if (c < 0x10000) {\n      utf16buf[out++] = c;\n    } else {\n      c -= 0x10000;\n      utf16buf[out++] = 0xd800 | ((c >> 10) & 0x3ff);\n      utf16buf[out++] = 0xdc00 | (c & 0x3ff);\n    }\n  }\n\n  return buf2binstring(utf16buf, out);\n};\n\n\n// Calculate max possible position in utf8 buffer,\n// that will not break sequence. If that's not possible\n// - (very small limits) return max size as is.\n//\n// buf[] - utf8 bytes array\n// max   - length limit (mandatory);\nexports.utf8border = function (buf, max) {\n  var pos;\n\n  max = max || buf.length;\n  if (max > buf.length) { max = buf.length; }\n\n  // go back from last position, until start of sequence found\n  pos = max - 1;\n  while (pos >= 0 && (buf[pos] & 0xC0) === 0x80) { pos--; }\n\n  // Fuckup - very small and broken sequence,\n  // return max, because we should return something anyway.\n  if (pos < 0) { return max; }\n\n  // If we came to start of buffer - that means vuffer is too small,\n  // return max too.\n  if (pos === 0) { return max; }\n\n  return (pos + _utf8len[buf[pos]] > max) ? pos : max;\n};\n",
     "'use strict';\n\n// Note: adler32 takes 12% for level 0 and 2% for level 6.\n// It doesn't worth to make additional optimizationa as in original.\n// Small size is preferable.\n\nfunction adler32(adler, buf, len, pos) {\n  var s1 = (adler & 0xffff) |0,\n      s2 = ((adler >>> 16) & 0xffff) |0,\n      n = 0;\n\n  while (len !== 0) {\n    // Set limit ~ twice less than 5552, to keep\n    // s2 in 31-bits, because we force signed ints.\n    // in other case %= will fail.\n    n = len > 2000 ? 2000 : len;\n    len -= n;\n\n    do {\n      s1 = (s1 + buf[pos++]) |0;\n      s2 = (s2 + s1) |0;\n    } while (--n);\n\n    s1 %= 65521;\n    s2 %= 65521;\n  }\n\n  return (s1 | (s2 << 16)) |0;\n}\n\n\nmodule.exports = adler32;\n",
@@ -450,42 +454,38 @@
     "'use strict';\n\n\nfunction GZheader() {\n  /* true if compressed data believed to be text */\n  this.text       = 0;\n  /* modification time */\n  this.time       = 0;\n  /* extra flags (not used when writing a gzip file) */\n  this.xflags     = 0;\n  /* operating system */\n  this.os         = 0;\n  /* pointer to extra field or Z_NULL if none */\n  this.extra      = null;\n  /* extra field length (valid if extra != Z_NULL) */\n  this.extra_len  = 0; // Actually, we don't need it in JS,\n                       // but leave for few code modifications\n\n  //\n  // Setup limits is not necessary because in js we should not preallocate memory\n  // for inflate use constant limit in 65536 bytes\n  //\n\n  /* space at extra (only when reading header) */\n  // this.extra_max  = 0;\n  /* pointer to zero-terminated file name or Z_NULL */\n  this.name       = '';\n  /* space at name (only when reading header) */\n  // this.name_max   = 0;\n  /* pointer to zero-terminated comment or Z_NULL */\n  this.comment    = '';\n  /* space at comment (only when reading header) */\n  // this.comm_max   = 0;\n  /* true if there was or will be a header crc */\n  this.hcrc       = 0;\n  /* true when done reading gzip header (not used when writing a gzip file) */\n  this.done       = false;\n}\n\nmodule.exports = GZheader;\n",
     "'use strict';\n\n// See state defs from inflate.js\nvar BAD = 30;       /* got a data error -- remain here until reset */\nvar TYPE = 12;      /* i: waiting for type bits, including last-flag bit */\n\n/*\n   Decode literal, length, and distance codes and write out the resulting\n   literal and match bytes until either not enough input or output is\n   available, an end-of-block is encountered, or a data error is encountered.\n   When large enough input and output buffers are supplied to inflate(), for\n   example, a 16K input buffer and a 64K output buffer, more than 95% of the\n   inflate execution time is spent in this routine.\n\n   Entry assumptions:\n\n        state.mode === LEN\n        strm.avail_in >= 6\n        strm.avail_out >= 258\n        start >= strm.avail_out\n        state.bits < 8\n\n   On return, state.mode is one of:\n\n        LEN -- ran out of enough output space or enough available input\n        TYPE -- reached end of block code, inflate() to interpret next block\n        BAD -- error in block data\n\n   Notes:\n\n    - The maximum input bits used by a length/distance pair is 15 bits for the\n      length code, 5 bits for the length extra, 15 bits for the distance code,\n      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.\n      Therefore if strm.avail_in >= 6, then there is enough input to avoid\n      checking for available input while decoding.\n\n    - The maximum bytes that a single length/distance pair can output is 258\n      bytes, which is the maximum length that can be coded.  inflate_fast()\n      requires strm.avail_out >= 258 for each loop to avoid checking for\n      output space.\n */\nmodule.exports = function inflate_fast(strm, start) {\n  var state;\n  var _in;                    /* local strm.input */\n  var last;                   /* have enough input while in < last */\n  var _out;                   /* local strm.output */\n  var beg;                    /* inflate()'s initial strm.output */\n  var end;                    /* while out < end, enough space available */\n//#ifdef INFLATE_STRICT\n  var dmax;                   /* maximum distance from zlib header */\n//#endif\n  var wsize;                  /* window size or zero if not using window */\n  var whave;                  /* valid bytes in the window */\n  var wnext;                  /* window write index */\n  // Use `s_window` instead `window`, avoid conflict with instrumentation tools\n  var s_window;               /* allocated sliding window, if wsize != 0 */\n  var hold;                   /* local strm.hold */\n  var bits;                   /* local strm.bits */\n  var lcode;                  /* local strm.lencode */\n  var dcode;                  /* local strm.distcode */\n  var lmask;                  /* mask for first level of length codes */\n  var dmask;                  /* mask for first level of distance codes */\n  var here;                   /* retrieved table entry */\n  var op;                     /* code bits, operation, extra bits, or */\n                              /*  window position, window bytes to copy */\n  var len;                    /* match length, unused bytes */\n  var dist;                   /* match distance */\n  var from;                   /* where to copy match from */\n  var from_source;\n\n\n  var input, output; // JS specific, because we have no pointers\n\n  /* copy state to local variables */\n  state = strm.state;\n  //here = state.here;\n  _in = strm.next_in;\n  input = strm.input;\n  last = _in + (strm.avail_in - 5);\n  _out = strm.next_out;\n  output = strm.output;\n  beg = _out - (start - strm.avail_out);\n  end = _out + (strm.avail_out - 257);\n//#ifdef INFLATE_STRICT\n  dmax = state.dmax;\n//#endif\n  wsize = state.wsize;\n  whave = state.whave;\n  wnext = state.wnext;\n  s_window = state.window;\n  hold = state.hold;\n  bits = state.bits;\n  lcode = state.lencode;\n  dcode = state.distcode;\n  lmask = (1 << state.lenbits) - 1;\n  dmask = (1 << state.distbits) - 1;\n\n\n  /* decode literals and length/distances until end-of-block or not enough\n     input data or output space */\n\n  top:\n  do {\n    if (bits < 15) {\n      hold += input[_in++] << bits;\n      bits += 8;\n      hold += input[_in++] << bits;\n      bits += 8;\n    }\n\n    here = lcode[hold & lmask];\n\n    dolen:\n    for (;;) { // Goto emulation\n      op = here >>> 24/*here.bits*/;\n      hold >>>= op;\n      bits -= op;\n      op = (here >>> 16) & 0xff/*here.op*/;\n      if (op === 0) {                          /* literal */\n        //Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?\n        //        \"inflate:         literal '%c'\\n\" :\n        //        \"inflate:         literal 0x%02x\\n\", here.val));\n        output[_out++] = here & 0xffff/*here.val*/;\n      }\n      else if (op & 16) {                     /* length base */\n        len = here & 0xffff/*here.val*/;\n        op &= 15;                           /* number of extra bits */\n        if (op) {\n          if (bits < op) {\n            hold += input[_in++] << bits;\n            bits += 8;\n          }\n          len += hold & ((1 << op) - 1);\n          hold >>>= op;\n          bits -= op;\n        }\n        //Tracevv((stderr, \"inflate:         length %u\\n\", len));\n        if (bits < 15) {\n          hold += input[_in++] << bits;\n          bits += 8;\n          hold += input[_in++] << bits;\n          bits += 8;\n        }\n        here = dcode[hold & dmask];\n\n        dodist:\n        for (;;) { // goto emulation\n          op = here >>> 24/*here.bits*/;\n          hold >>>= op;\n          bits -= op;\n          op = (here >>> 16) & 0xff/*here.op*/;\n\n          if (op & 16) {                      /* distance base */\n            dist = here & 0xffff/*here.val*/;\n            op &= 15;                       /* number of extra bits */\n            if (bits < op) {\n              hold += input[_in++] << bits;\n              bits += 8;\n              if (bits < op) {\n                hold += input[_in++] << bits;\n                bits += 8;\n              }\n            }\n            dist += hold & ((1 << op) - 1);\n//#ifdef INFLATE_STRICT\n            if (dist > dmax) {\n              strm.msg = 'invalid distance too far back';\n              state.mode = BAD;\n              break top;\n            }\n//#endif\n            hold >>>= op;\n            bits -= op;\n            //Tracevv((stderr, \"inflate:         distance %u\\n\", dist));\n            op = _out - beg;                /* max distance in output */\n            if (dist > op) {                /* see if copy from window */\n              op = dist - op;               /* distance back in window */\n              if (op > whave) {\n                if (state.sane) {\n                  strm.msg = 'invalid distance too far back';\n                  state.mode = BAD;\n                  break top;\n                }\n\n// (!) This block is disabled in zlib defailts,\n// don't enable it for binary compatibility\n//#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR\n//                if (len <= op - whave) {\n//                  do {\n//                    output[_out++] = 0;\n//                  } while (--len);\n//                  continue top;\n//                }\n//                len -= op - whave;\n//                do {\n//                  output[_out++] = 0;\n//                } while (--op > whave);\n//                if (op === 0) {\n//                  from = _out - dist;\n//                  do {\n//                    output[_out++] = output[from++];\n//                  } while (--len);\n//                  continue top;\n//                }\n//#endif\n              }\n              from = 0; // window index\n              from_source = s_window;\n              if (wnext === 0) {           /* very common case */\n                from += wsize - op;\n                if (op < len) {         /* some from window */\n                  len -= op;\n                  do {\n                    output[_out++] = s_window[from++];\n                  } while (--op);\n                  from = _out - dist;  /* rest from output */\n                  from_source = output;\n                }\n              }\n              else if (wnext < op) {      /* wrap around window */\n                from += wsize + wnext - op;\n                op -= wnext;\n                if (op < len) {         /* some from end of window */\n                  len -= op;\n                  do {\n                    output[_out++] = s_window[from++];\n                  } while (--op);\n                  from = 0;\n                  if (wnext < len) {  /* some from start of window */\n                    op = wnext;\n                    len -= op;\n                    do {\n                      output[_out++] = s_window[from++];\n                    } while (--op);\n                    from = _out - dist;      /* rest from output */\n                    from_source = output;\n                  }\n                }\n              }\n              else {                      /* contiguous in window */\n                from += wnext - op;\n                if (op < len) {         /* some from window */\n                  len -= op;\n                  do {\n                    output[_out++] = s_window[from++];\n                  } while (--op);\n                  from = _out - dist;  /* rest from output */\n                  from_source = output;\n                }\n              }\n              while (len > 2) {\n                output[_out++] = from_source[from++];\n                output[_out++] = from_source[from++];\n                output[_out++] = from_source[from++];\n                len -= 3;\n              }\n              if (len) {\n                output[_out++] = from_source[from++];\n                if (len > 1) {\n                  output[_out++] = from_source[from++];\n                }\n              }\n            }\n            else {\n              from = _out - dist;          /* copy direct from output */\n              do {                        /* minimum length is three */\n                output[_out++] = output[from++];\n                output[_out++] = output[from++];\n                output[_out++] = output[from++];\n                len -= 3;\n              } while (len > 2);\n              if (len) {\n                output[_out++] = output[from++];\n                if (len > 1) {\n                  output[_out++] = output[from++];\n                }\n              }\n            }\n          }\n          else if ((op & 64) === 0) {          /* 2nd level distance code */\n            here = dcode[(here & 0xffff)/*here.val*/ + (hold & ((1 << op) - 1))];\n            continue dodist;\n          }\n          else {\n            strm.msg = 'invalid distance code';\n            state.mode = BAD;\n            break top;\n          }\n\n          break; // need to emulate goto via \"continue\"\n        }\n      }\n      else if ((op & 64) === 0) {              /* 2nd level length code */\n        here = lcode[(here & 0xffff)/*here.val*/ + (hold & ((1 << op) - 1))];\n        continue dolen;\n      }\n      else if (op & 32) {                     /* end-of-block */\n        //Tracevv((stderr, \"inflate:         end of block\\n\"));\n        state.mode = TYPE;\n        break top;\n      }\n      else {\n        strm.msg = 'invalid literal/length code';\n        state.mode = BAD;\n        break top;\n      }\n\n      break; // need to emulate goto via \"continue\"\n    }\n  } while (_in < last && _out < end);\n\n  /* return unused bytes (on entry, bits < 8, so in won't go too far back) */\n  len = bits >> 3;\n  _in -= len;\n  bits -= len << 3;\n  hold &= (1 << bits) - 1;\n\n  /* update state and return */\n  strm.next_in = _in;\n  strm.next_out = _out;\n  strm.avail_in = (_in < last ? 5 + (last - _in) : 5 - (_in - last));\n  strm.avail_out = (_out < end ? 257 + (end - _out) : 257 - (_out - end));\n  state.hold = hold;\n  state.bits = bits;\n  return;\n};\n",
     "'use strict';\n\n\nvar utils         = require('../utils/common');\nvar adler32       = require('./adler32');\nvar crc32         = require('./crc32');\nvar inflate_fast  = require('./inffast');\nvar inflate_table = require('./inftrees');\n\nvar CODES = 0;\nvar LENS = 1;\nvar DISTS = 2;\n\n/* Public constants ==========================================================*/\n/* ===========================================================================*/\n\n\n/* Allowed flush values; see deflate() and inflate() below for details */\n//var Z_NO_FLUSH      = 0;\n//var Z_PARTIAL_FLUSH = 1;\n//var Z_SYNC_FLUSH    = 2;\n//var Z_FULL_FLUSH    = 3;\nvar Z_FINISH        = 4;\nvar Z_BLOCK         = 5;\nvar Z_TREES         = 6;\n\n\n/* Return codes for the compression/decompression functions. Negative values\n * are errors, positive values are used for special but normal events.\n */\nvar Z_OK            = 0;\nvar Z_STREAM_END    = 1;\nvar Z_NEED_DICT     = 2;\n//var Z_ERRNO         = -1;\nvar Z_STREAM_ERROR  = -2;\nvar Z_DATA_ERROR    = -3;\nvar Z_MEM_ERROR     = -4;\nvar Z_BUF_ERROR     = -5;\n//var Z_VERSION_ERROR = -6;\n\n/* The deflate compression method */\nvar Z_DEFLATED  = 8;\n\n\n/* STATES ====================================================================*/\n/* ===========================================================================*/\n\n\nvar    HEAD = 1;       /* i: waiting for magic header */\nvar    FLAGS = 2;      /* i: waiting for method and flags (gzip) */\nvar    TIME = 3;       /* i: waiting for modification time (gzip) */\nvar    OS = 4;         /* i: waiting for extra flags and operating system (gzip) */\nvar    EXLEN = 5;      /* i: waiting for extra length (gzip) */\nvar    EXTRA = 6;      /* i: waiting for extra bytes (gzip) */\nvar    NAME = 7;       /* i: waiting for end of file name (gzip) */\nvar    COMMENT = 8;    /* i: waiting for end of comment (gzip) */\nvar    HCRC = 9;       /* i: waiting for header crc (gzip) */\nvar    DICTID = 10;    /* i: waiting for dictionary check value */\nvar    DICT = 11;      /* waiting for inflateSetDictionary() call */\nvar        TYPE = 12;      /* i: waiting for type bits, including last-flag bit */\nvar        TYPEDO = 13;    /* i: same, but skip check to exit inflate on new block */\nvar        STORED = 14;    /* i: waiting for stored size (length and complement) */\nvar        COPY_ = 15;     /* i/o: same as COPY below, but only first time in */\nvar        COPY = 16;      /* i/o: waiting for input or output to copy stored block */\nvar        TABLE = 17;     /* i: waiting for dynamic block table lengths */\nvar        LENLENS = 18;   /* i: waiting for code length code lengths */\nvar        CODELENS = 19;  /* i: waiting for length/lit and distance code lengths */\nvar            LEN_ = 20;      /* i: same as LEN below, but only first time in */\nvar            LEN = 21;       /* i: waiting for length/lit/eob code */\nvar            LENEXT = 22;    /* i: waiting for length extra bits */\nvar            DIST = 23;      /* i: waiting for distance code */\nvar            DISTEXT = 24;   /* i: waiting for distance extra bits */\nvar            MATCH = 25;     /* o: waiting for output space to copy string */\nvar            LIT = 26;       /* o: waiting for output space to write literal */\nvar    CHECK = 27;     /* i: waiting for 32-bit check value */\nvar    LENGTH = 28;    /* i: waiting for 32-bit length (gzip) */\nvar    DONE = 29;      /* finished check, done -- remain here until reset */\nvar    BAD = 30;       /* got a data error -- remain here until reset */\nvar    MEM = 31;       /* got an inflate() memory error -- remain here until reset */\nvar    SYNC = 32;      /* looking for synchronization bytes to restart inflate() */\n\n/* ===========================================================================*/\n\n\n\nvar ENOUGH_LENS = 852;\nvar ENOUGH_DISTS = 592;\n//var ENOUGH =  (ENOUGH_LENS+ENOUGH_DISTS);\n\nvar MAX_WBITS = 15;\n/* 32K LZ77 window */\nvar DEF_WBITS = MAX_WBITS;\n\n\nfunction zswap32(q) {\n  return  (((q >>> 24) & 0xff) +\n          ((q >>> 8) & 0xff00) +\n          ((q & 0xff00) << 8) +\n          ((q & 0xff) << 24));\n}\n\n\nfunction InflateState() {\n  this.mode = 0;             /* current inflate mode */\n  this.last = false;          /* true if processing last block */\n  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */\n  this.havedict = false;      /* true if dictionary provided */\n  this.flags = 0;             /* gzip header method and flags (0 if zlib) */\n  this.dmax = 0;              /* zlib header max distance (INFLATE_STRICT) */\n  this.check = 0;             /* protected copy of check value */\n  this.total = 0;             /* protected copy of output count */\n  // TODO: may be {}\n  this.head = null;           /* where to save gzip header information */\n\n  /* sliding window */\n  this.wbits = 0;             /* log base 2 of requested window size */\n  this.wsize = 0;             /* window size or zero if not using window */\n  this.whave = 0;             /* valid bytes in the window */\n  this.wnext = 0;             /* window write index */\n  this.window = null;         /* allocated sliding window, if needed */\n\n  /* bit accumulator */\n  this.hold = 0;              /* input bit accumulator */\n  this.bits = 0;              /* number of bits in \"in\" */\n\n  /* for string and stored block copying */\n  this.length = 0;            /* literal or length of data to copy */\n  this.offset = 0;            /* distance back to copy string from */\n\n  /* for table and code decoding */\n  this.extra = 0;             /* extra bits needed */\n\n  /* fixed and dynamic code tables */\n  this.lencode = null;          /* starting table for length/literal codes */\n  this.distcode = null;         /* starting table for distance codes */\n  this.lenbits = 0;           /* index bits for lencode */\n  this.distbits = 0;          /* index bits for distcode */\n\n  /* dynamic table building */\n  this.ncode = 0;             /* number of code length code lengths */\n  this.nlen = 0;              /* number of length code lengths */\n  this.ndist = 0;             /* number of distance code lengths */\n  this.have = 0;              /* number of code lengths in lens[] */\n  this.next = null;              /* next available space in codes[] */\n\n  this.lens = new utils.Buf16(320); /* temporary storage for code lengths */\n  this.work = new utils.Buf16(288); /* work area for code table building */\n\n  /*\n   because we don't have pointers in js, we use lencode and distcode directly\n   as buffers so we don't need codes\n  */\n  //this.codes = new utils.Buf32(ENOUGH);       /* space for code tables */\n  this.lendyn = null;              /* dynamic table for length/literal codes (JS specific) */\n  this.distdyn = null;             /* dynamic table for distance codes (JS specific) */\n  this.sane = 0;                   /* if false, allow invalid distance too far */\n  this.back = 0;                   /* bits back of last unprocessed length/lit */\n  this.was = 0;                    /* initial length of match */\n}\n\nfunction inflateResetKeep(strm) {\n  var state;\n\n  if (!strm || !strm.state) { return Z_STREAM_ERROR; }\n  state = strm.state;\n  strm.total_in = strm.total_out = state.total = 0;\n  strm.msg = ''; /*Z_NULL*/\n  if (state.wrap) {       /* to support ill-conceived Java test suite */\n    strm.adler = state.wrap & 1;\n  }\n  state.mode = HEAD;\n  state.last = 0;\n  state.havedict = 0;\n  state.dmax = 32768;\n  state.head = null/*Z_NULL*/;\n  state.hold = 0;\n  state.bits = 0;\n  //state.lencode = state.distcode = state.next = state.codes;\n  state.lencode = state.lendyn = new utils.Buf32(ENOUGH_LENS);\n  state.distcode = state.distdyn = new utils.Buf32(ENOUGH_DISTS);\n\n  state.sane = 1;\n  state.back = -1;\n  //Tracev((stderr, \"inflate: reset\\n\"));\n  return Z_OK;\n}\n\nfunction inflateReset(strm) {\n  var state;\n\n  if (!strm || !strm.state) { return Z_STREAM_ERROR; }\n  state = strm.state;\n  state.wsize = 0;\n  state.whave = 0;\n  state.wnext = 0;\n  return inflateResetKeep(strm);\n\n}\n\nfunction inflateReset2(strm, windowBits) {\n  var wrap;\n  var state;\n\n  /* get the state */\n  if (!strm || !strm.state) { return Z_STREAM_ERROR; }\n  state = strm.state;\n\n  /* extract wrap request from windowBits parameter */\n  if (windowBits < 0) {\n    wrap = 0;\n    windowBits = -windowBits;\n  }\n  else {\n    wrap = (windowBits >> 4) + 1;\n    if (windowBits < 48) {\n      windowBits &= 15;\n    }\n  }\n\n  /* set number of window bits, free window if different */\n  if (windowBits && (windowBits < 8 || windowBits > 15)) {\n    return Z_STREAM_ERROR;\n  }\n  if (state.window !== null && state.wbits !== windowBits) {\n    state.window = null;\n  }\n\n  /* update state and reset the rest of it */\n  state.wrap = wrap;\n  state.wbits = windowBits;\n  return inflateReset(strm);\n}\n\nfunction inflateInit2(strm, windowBits) {\n  var ret;\n  var state;\n\n  if (!strm) { return Z_STREAM_ERROR; }\n  //strm.msg = Z_NULL;                 /* in case we return an error */\n\n  state = new InflateState();\n\n  //if (state === Z_NULL) return Z_MEM_ERROR;\n  //Tracev((stderr, \"inflate: allocated\\n\"));\n  strm.state = state;\n  state.window = null/*Z_NULL*/;\n  ret = inflateReset2(strm, windowBits);\n  if (ret !== Z_OK) {\n    strm.state = null/*Z_NULL*/;\n  }\n  return ret;\n}\n\nfunction inflateInit(strm) {\n  return inflateInit2(strm, DEF_WBITS);\n}\n\n\n/*\n Return state with length and distance decoding tables and index sizes set to\n fixed code decoding.  Normally this returns fixed tables from inffixed.h.\n If BUILDFIXED is defined, then instead this routine builds the tables the\n first time it's called, and returns those tables the first time and\n thereafter.  This reduces the size of the code by about 2K bytes, in\n exchange for a little execution time.  However, BUILDFIXED should not be\n used for threaded applications, since the rewriting of the tables and virgin\n may not be thread-safe.\n */\nvar virgin = true;\n\nvar lenfix, distfix; // We have no pointers in JS, so keep tables separate\n\nfunction fixedtables(state) {\n  /* build fixed huffman tables if first call (may not be thread safe) */\n  if (virgin) {\n    var sym;\n\n    lenfix = new utils.Buf32(512);\n    distfix = new utils.Buf32(32);\n\n    /* literal/length table */\n    sym = 0;\n    while (sym < 144) { state.lens[sym++] = 8; }\n    while (sym < 256) { state.lens[sym++] = 9; }\n    while (sym < 280) { state.lens[sym++] = 7; }\n    while (sym < 288) { state.lens[sym++] = 8; }\n\n    inflate_table(LENS,  state.lens, 0, 288, lenfix,   0, state.work, { bits: 9 });\n\n    /* distance table */\n    sym = 0;\n    while (sym < 32) { state.lens[sym++] = 5; }\n\n    inflate_table(DISTS, state.lens, 0, 32,   distfix, 0, state.work, { bits: 5 });\n\n    /* do this just once */\n    virgin = false;\n  }\n\n  state.lencode = lenfix;\n  state.lenbits = 9;\n  state.distcode = distfix;\n  state.distbits = 5;\n}\n\n\n/*\n Update the window with the last wsize (normally 32K) bytes written before\n returning.  If window does not exist yet, create it.  This is only called\n when a window is already in use, or when output has been written during this\n inflate call, but the end of the deflate stream has not been reached yet.\n It is also called to create a window for dictionary data when a dictionary\n is loaded.\n\n Providing output buffers larger than 32K to inflate() should provide a speed\n advantage, since only the last 32K of output is copied to the sliding window\n upon return from inflate(), and since all distances after the first 32K of\n output will fall in the output data, making match copies simpler and faster.\n The advantage may be dependent on the size of the processor's data caches.\n */\nfunction updatewindow(strm, src, end, copy) {\n  var dist;\n  var state = strm.state;\n\n  /* if it hasn't been done already, allocate space for the window */\n  if (state.window === null) {\n    state.wsize = 1 << state.wbits;\n    state.wnext = 0;\n    state.whave = 0;\n\n    state.window = new utils.Buf8(state.wsize);\n  }\n\n  /* copy state->wsize or less output bytes into the circular window */\n  if (copy >= state.wsize) {\n    utils.arraySet(state.window, src, end - state.wsize, state.wsize, 0);\n    state.wnext = 0;\n    state.whave = state.wsize;\n  }\n  else {\n    dist = state.wsize - state.wnext;\n    if (dist > copy) {\n      dist = copy;\n    }\n    //zmemcpy(state->window + state->wnext, end - copy, dist);\n    utils.arraySet(state.window, src, end - copy, dist, state.wnext);\n    copy -= dist;\n    if (copy) {\n      //zmemcpy(state->window, end - copy, copy);\n      utils.arraySet(state.window, src, end - copy, copy, 0);\n      state.wnext = copy;\n      state.whave = state.wsize;\n    }\n    else {\n      state.wnext += dist;\n      if (state.wnext === state.wsize) { state.wnext = 0; }\n      if (state.whave < state.wsize) { state.whave += dist; }\n    }\n  }\n  return 0;\n}\n\nfunction inflate(strm, flush) {\n  var state;\n  var input, output;          // input/output buffers\n  var next;                   /* next input INDEX */\n  var put;                    /* next output INDEX */\n  var have, left;             /* available input and output */\n  var hold;                   /* bit buffer */\n  var bits;                   /* bits in bit buffer */\n  var _in, _out;              /* save starting available input and output */\n  var copy;                   /* number of stored or match bytes to copy */\n  var from;                   /* where to copy match bytes from */\n  var from_source;\n  var here = 0;               /* current decoding table entry */\n  var here_bits, here_op, here_val; // paked \"here\" denormalized (JS specific)\n  //var last;                   /* parent table entry */\n  var last_bits, last_op, last_val; // paked \"last\" denormalized (JS specific)\n  var len;                    /* length to copy for repeats, bits to drop */\n  var ret;                    /* return code */\n  var hbuf = new utils.Buf8(4);    /* buffer for gzip header crc calculation */\n  var opts;\n\n  var n; // temporary var for NEED_BITS\n\n  var order = /* permutation of code lengths */\n    [ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ];\n\n\n  if (!strm || !strm.state || !strm.output ||\n      (!strm.input && strm.avail_in !== 0)) {\n    return Z_STREAM_ERROR;\n  }\n\n  state = strm.state;\n  if (state.mode === TYPE) { state.mode = TYPEDO; }    /* skip check */\n\n\n  //--- LOAD() ---\n  put = strm.next_out;\n  output = strm.output;\n  left = strm.avail_out;\n  next = strm.next_in;\n  input = strm.input;\n  have = strm.avail_in;\n  hold = state.hold;\n  bits = state.bits;\n  //---\n\n  _in = have;\n  _out = left;\n  ret = Z_OK;\n\n  inf_leave: // goto emulation\n  for (;;) {\n    switch (state.mode) {\n    case HEAD:\n      if (state.wrap === 0) {\n        state.mode = TYPEDO;\n        break;\n      }\n      //=== NEEDBITS(16);\n      while (bits < 16) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      if ((state.wrap & 2) && hold === 0x8b1f) {  /* gzip header */\n        state.check = 0/*crc32(0L, Z_NULL, 0)*/;\n        //=== CRC2(state.check, hold);\n        hbuf[0] = hold & 0xff;\n        hbuf[1] = (hold >>> 8) & 0xff;\n        state.check = crc32(state.check, hbuf, 2, 0);\n        //===//\n\n        //=== INITBITS();\n        hold = 0;\n        bits = 0;\n        //===//\n        state.mode = FLAGS;\n        break;\n      }\n      state.flags = 0;           /* expect zlib header */\n      if (state.head) {\n        state.head.done = false;\n      }\n      if (!(state.wrap & 1) ||   /* check if zlib header allowed */\n        (((hold & 0xff)/*BITS(8)*/ << 8) + (hold >> 8)) % 31) {\n        strm.msg = 'incorrect header check';\n        state.mode = BAD;\n        break;\n      }\n      if ((hold & 0x0f)/*BITS(4)*/ !== Z_DEFLATED) {\n        strm.msg = 'unknown compression method';\n        state.mode = BAD;\n        break;\n      }\n      //--- DROPBITS(4) ---//\n      hold >>>= 4;\n      bits -= 4;\n      //---//\n      len = (hold & 0x0f)/*BITS(4)*/ + 8;\n      if (state.wbits === 0) {\n        state.wbits = len;\n      }\n      else if (len > state.wbits) {\n        strm.msg = 'invalid window size';\n        state.mode = BAD;\n        break;\n      }\n      state.dmax = 1 << len;\n      //Tracev((stderr, \"inflate:   zlib header ok\\n\"));\n      strm.adler = state.check = 1/*adler32(0L, Z_NULL, 0)*/;\n      state.mode = hold & 0x200 ? DICTID : TYPE;\n      //=== INITBITS();\n      hold = 0;\n      bits = 0;\n      //===//\n      break;\n    case FLAGS:\n      //=== NEEDBITS(16); */\n      while (bits < 16) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      state.flags = hold;\n      if ((state.flags & 0xff) !== Z_DEFLATED) {\n        strm.msg = 'unknown compression method';\n        state.mode = BAD;\n        break;\n      }\n      if (state.flags & 0xe000) {\n        strm.msg = 'unknown header flags set';\n        state.mode = BAD;\n        break;\n      }\n      if (state.head) {\n        state.head.text = ((hold >> 8) & 1);\n      }\n      if (state.flags & 0x0200) {\n        //=== CRC2(state.check, hold);\n        hbuf[0] = hold & 0xff;\n        hbuf[1] = (hold >>> 8) & 0xff;\n        state.check = crc32(state.check, hbuf, 2, 0);\n        //===//\n      }\n      //=== INITBITS();\n      hold = 0;\n      bits = 0;\n      //===//\n      state.mode = TIME;\n      /* falls through */\n    case TIME:\n      //=== NEEDBITS(32); */\n      while (bits < 32) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      if (state.head) {\n        state.head.time = hold;\n      }\n      if (state.flags & 0x0200) {\n        //=== CRC4(state.check, hold)\n        hbuf[0] = hold & 0xff;\n        hbuf[1] = (hold >>> 8) & 0xff;\n        hbuf[2] = (hold >>> 16) & 0xff;\n        hbuf[3] = (hold >>> 24) & 0xff;\n        state.check = crc32(state.check, hbuf, 4, 0);\n        //===\n      }\n      //=== INITBITS();\n      hold = 0;\n      bits = 0;\n      //===//\n      state.mode = OS;\n      /* falls through */\n    case OS:\n      //=== NEEDBITS(16); */\n      while (bits < 16) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      if (state.head) {\n        state.head.xflags = (hold & 0xff);\n        state.head.os = (hold >> 8);\n      }\n      if (state.flags & 0x0200) {\n        //=== CRC2(state.check, hold);\n        hbuf[0] = hold & 0xff;\n        hbuf[1] = (hold >>> 8) & 0xff;\n        state.check = crc32(state.check, hbuf, 2, 0);\n        //===//\n      }\n      //=== INITBITS();\n      hold = 0;\n      bits = 0;\n      //===//\n      state.mode = EXLEN;\n      /* falls through */\n    case EXLEN:\n      if (state.flags & 0x0400) {\n        //=== NEEDBITS(16); */\n        while (bits < 16) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        state.length = hold;\n        if (state.head) {\n          state.head.extra_len = hold;\n        }\n        if (state.flags & 0x0200) {\n          //=== CRC2(state.check, hold);\n          hbuf[0] = hold & 0xff;\n          hbuf[1] = (hold >>> 8) & 0xff;\n          state.check = crc32(state.check, hbuf, 2, 0);\n          //===//\n        }\n        //=== INITBITS();\n        hold = 0;\n        bits = 0;\n        //===//\n      }\n      else if (state.head) {\n        state.head.extra = null/*Z_NULL*/;\n      }\n      state.mode = EXTRA;\n      /* falls through */\n    case EXTRA:\n      if (state.flags & 0x0400) {\n        copy = state.length;\n        if (copy > have) { copy = have; }\n        if (copy) {\n          if (state.head) {\n            len = state.head.extra_len - state.length;\n            if (!state.head.extra) {\n              // Use untyped array for more conveniend processing later\n              state.head.extra = new Array(state.head.extra_len);\n            }\n            utils.arraySet(\n              state.head.extra,\n              input,\n              next,\n              // extra field is limited to 65536 bytes\n              // - no need for additional size check\n              copy,\n              /*len + copy > state.head.extra_max - len ? state.head.extra_max : copy,*/\n              len\n            );\n            //zmemcpy(state.head.extra + len, next,\n            //        len + copy > state.head.extra_max ?\n            //        state.head.extra_max - len : copy);\n          }\n          if (state.flags & 0x0200) {\n            state.check = crc32(state.check, input, copy, next);\n          }\n          have -= copy;\n          next += copy;\n          state.length -= copy;\n        }\n        if (state.length) { break inf_leave; }\n      }\n      state.length = 0;\n      state.mode = NAME;\n      /* falls through */\n    case NAME:\n      if (state.flags & 0x0800) {\n        if (have === 0) { break inf_leave; }\n        copy = 0;\n        do {\n          // TODO: 2 or 1 bytes?\n          len = input[next + copy++];\n          /* use constant limit because in js we should not preallocate memory */\n          if (state.head && len &&\n              (state.length < 65536 /*state.head.name_max*/)) {\n            state.head.name += String.fromCharCode(len);\n          }\n        } while (len && copy < have);\n\n        if (state.flags & 0x0200) {\n          state.check = crc32(state.check, input, copy, next);\n        }\n        have -= copy;\n        next += copy;\n        if (len) { break inf_leave; }\n      }\n      else if (state.head) {\n        state.head.name = null;\n      }\n      state.length = 0;\n      state.mode = COMMENT;\n      /* falls through */\n    case COMMENT:\n      if (state.flags & 0x1000) {\n        if (have === 0) { break inf_leave; }\n        copy = 0;\n        do {\n          len = input[next + copy++];\n          /* use constant limit because in js we should not preallocate memory */\n          if (state.head && len &&\n              (state.length < 65536 /*state.head.comm_max*/)) {\n            state.head.comment += String.fromCharCode(len);\n          }\n        } while (len && copy < have);\n        if (state.flags & 0x0200) {\n          state.check = crc32(state.check, input, copy, next);\n        }\n        have -= copy;\n        next += copy;\n        if (len) { break inf_leave; }\n      }\n      else if (state.head) {\n        state.head.comment = null;\n      }\n      state.mode = HCRC;\n      /* falls through */\n    case HCRC:\n      if (state.flags & 0x0200) {\n        //=== NEEDBITS(16); */\n        while (bits < 16) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        if (hold !== (state.check & 0xffff)) {\n          strm.msg = 'header crc mismatch';\n          state.mode = BAD;\n          break;\n        }\n        //=== INITBITS();\n        hold = 0;\n        bits = 0;\n        //===//\n      }\n      if (state.head) {\n        state.head.hcrc = ((state.flags >> 9) & 1);\n        state.head.done = true;\n      }\n      strm.adler = state.check = 0;\n      state.mode = TYPE;\n      break;\n    case DICTID:\n      //=== NEEDBITS(32); */\n      while (bits < 32) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      strm.adler = state.check = zswap32(hold);\n      //=== INITBITS();\n      hold = 0;\n      bits = 0;\n      //===//\n      state.mode = DICT;\n      /* falls through */\n    case DICT:\n      if (state.havedict === 0) {\n        //--- RESTORE() ---\n        strm.next_out = put;\n        strm.avail_out = left;\n        strm.next_in = next;\n        strm.avail_in = have;\n        state.hold = hold;\n        state.bits = bits;\n        //---\n        return Z_NEED_DICT;\n      }\n      strm.adler = state.check = 1/*adler32(0L, Z_NULL, 0)*/;\n      state.mode = TYPE;\n      /* falls through */\n    case TYPE:\n      if (flush === Z_BLOCK || flush === Z_TREES) { break inf_leave; }\n      /* falls through */\n    case TYPEDO:\n      if (state.last) {\n        //--- BYTEBITS() ---//\n        hold >>>= bits & 7;\n        bits -= bits & 7;\n        //---//\n        state.mode = CHECK;\n        break;\n      }\n      //=== NEEDBITS(3); */\n      while (bits < 3) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      state.last = (hold & 0x01)/*BITS(1)*/;\n      //--- DROPBITS(1) ---//\n      hold >>>= 1;\n      bits -= 1;\n      //---//\n\n      switch ((hold & 0x03)/*BITS(2)*/) {\n      case 0:                             /* stored block */\n        //Tracev((stderr, \"inflate:     stored block%s\\n\",\n        //        state.last ? \" (last)\" : \"\"));\n        state.mode = STORED;\n        break;\n      case 1:                             /* fixed block */\n        fixedtables(state);\n        //Tracev((stderr, \"inflate:     fixed codes block%s\\n\",\n        //        state.last ? \" (last)\" : \"\"));\n        state.mode = LEN_;             /* decode codes */\n        if (flush === Z_TREES) {\n          //--- DROPBITS(2) ---//\n          hold >>>= 2;\n          bits -= 2;\n          //---//\n          break inf_leave;\n        }\n        break;\n      case 2:                             /* dynamic block */\n        //Tracev((stderr, \"inflate:     dynamic codes block%s\\n\",\n        //        state.last ? \" (last)\" : \"\"));\n        state.mode = TABLE;\n        break;\n      case 3:\n        strm.msg = 'invalid block type';\n        state.mode = BAD;\n      }\n      //--- DROPBITS(2) ---//\n      hold >>>= 2;\n      bits -= 2;\n      //---//\n      break;\n    case STORED:\n      //--- BYTEBITS() ---// /* go to byte boundary */\n      hold >>>= bits & 7;\n      bits -= bits & 7;\n      //---//\n      //=== NEEDBITS(32); */\n      while (bits < 32) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      if ((hold & 0xffff) !== ((hold >>> 16) ^ 0xffff)) {\n        strm.msg = 'invalid stored block lengths';\n        state.mode = BAD;\n        break;\n      }\n      state.length = hold & 0xffff;\n      //Tracev((stderr, \"inflate:       stored length %u\\n\",\n      //        state.length));\n      //=== INITBITS();\n      hold = 0;\n      bits = 0;\n      //===//\n      state.mode = COPY_;\n      if (flush === Z_TREES) { break inf_leave; }\n      /* falls through */\n    case COPY_:\n      state.mode = COPY;\n      /* falls through */\n    case COPY:\n      copy = state.length;\n      if (copy) {\n        if (copy > have) { copy = have; }\n        if (copy > left) { copy = left; }\n        if (copy === 0) { break inf_leave; }\n        //--- zmemcpy(put, next, copy); ---\n        utils.arraySet(output, input, next, copy, put);\n        //---//\n        have -= copy;\n        next += copy;\n        left -= copy;\n        put += copy;\n        state.length -= copy;\n        break;\n      }\n      //Tracev((stderr, \"inflate:       stored end\\n\"));\n      state.mode = TYPE;\n      break;\n    case TABLE:\n      //=== NEEDBITS(14); */\n      while (bits < 14) {\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n      }\n      //===//\n      state.nlen = (hold & 0x1f)/*BITS(5)*/ + 257;\n      //--- DROPBITS(5) ---//\n      hold >>>= 5;\n      bits -= 5;\n      //---//\n      state.ndist = (hold & 0x1f)/*BITS(5)*/ + 1;\n      //--- DROPBITS(5) ---//\n      hold >>>= 5;\n      bits -= 5;\n      //---//\n      state.ncode = (hold & 0x0f)/*BITS(4)*/ + 4;\n      //--- DROPBITS(4) ---//\n      hold >>>= 4;\n      bits -= 4;\n      //---//\n//#ifndef PKZIP_BUG_WORKAROUND\n      if (state.nlen > 286 || state.ndist > 30) {\n        strm.msg = 'too many length or distance symbols';\n        state.mode = BAD;\n        break;\n      }\n//#endif\n      //Tracev((stderr, \"inflate:       table sizes ok\\n\"));\n      state.have = 0;\n      state.mode = LENLENS;\n      /* falls through */\n    case LENLENS:\n      while (state.have < state.ncode) {\n        //=== NEEDBITS(3);\n        while (bits < 3) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        state.lens[order[state.have++]] = (hold & 0x07);//BITS(3);\n        //--- DROPBITS(3) ---//\n        hold >>>= 3;\n        bits -= 3;\n        //---//\n      }\n      while (state.have < 19) {\n        state.lens[order[state.have++]] = 0;\n      }\n      // We have separate tables & no pointers. 2 commented lines below not needed.\n      //state.next = state.codes;\n      //state.lencode = state.next;\n      // Switch to use dynamic table\n      state.lencode = state.lendyn;\n      state.lenbits = 7;\n\n      opts = { bits: state.lenbits };\n      ret = inflate_table(CODES, state.lens, 0, 19, state.lencode, 0, state.work, opts);\n      state.lenbits = opts.bits;\n\n      if (ret) {\n        strm.msg = 'invalid code lengths set';\n        state.mode = BAD;\n        break;\n      }\n      //Tracev((stderr, \"inflate:       code lengths ok\\n\"));\n      state.have = 0;\n      state.mode = CODELENS;\n      /* falls through */\n    case CODELENS:\n      while (state.have < state.nlen + state.ndist) {\n        for (;;) {\n          here = state.lencode[hold & ((1 << state.lenbits) - 1)];/*BITS(state.lenbits)*/\n          here_bits = here >>> 24;\n          here_op = (here >>> 16) & 0xff;\n          here_val = here & 0xffff;\n\n          if ((here_bits) <= bits) { break; }\n          //--- PULLBYTE() ---//\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n          //---//\n        }\n        if (here_val < 16) {\n          //--- DROPBITS(here.bits) ---//\n          hold >>>= here_bits;\n          bits -= here_bits;\n          //---//\n          state.lens[state.have++] = here_val;\n        }\n        else {\n          if (here_val === 16) {\n            //=== NEEDBITS(here.bits + 2);\n            n = here_bits + 2;\n            while (bits < n) {\n              if (have === 0) { break inf_leave; }\n              have--;\n              hold += input[next++] << bits;\n              bits += 8;\n            }\n            //===//\n            //--- DROPBITS(here.bits) ---//\n            hold >>>= here_bits;\n            bits -= here_bits;\n            //---//\n            if (state.have === 0) {\n              strm.msg = 'invalid bit length repeat';\n              state.mode = BAD;\n              break;\n            }\n            len = state.lens[state.have - 1];\n            copy = 3 + (hold & 0x03);//BITS(2);\n            //--- DROPBITS(2) ---//\n            hold >>>= 2;\n            bits -= 2;\n            //---//\n          }\n          else if (here_val === 17) {\n            //=== NEEDBITS(here.bits + 3);\n            n = here_bits + 3;\n            while (bits < n) {\n              if (have === 0) { break inf_leave; }\n              have--;\n              hold += input[next++] << bits;\n              bits += 8;\n            }\n            //===//\n            //--- DROPBITS(here.bits) ---//\n            hold >>>= here_bits;\n            bits -= here_bits;\n            //---//\n            len = 0;\n            copy = 3 + (hold & 0x07);//BITS(3);\n            //--- DROPBITS(3) ---//\n            hold >>>= 3;\n            bits -= 3;\n            //---//\n          }\n          else {\n            //=== NEEDBITS(here.bits + 7);\n            n = here_bits + 7;\n            while (bits < n) {\n              if (have === 0) { break inf_leave; }\n              have--;\n              hold += input[next++] << bits;\n              bits += 8;\n            }\n            //===//\n            //--- DROPBITS(here.bits) ---//\n            hold >>>= here_bits;\n            bits -= here_bits;\n            //---//\n            len = 0;\n            copy = 11 + (hold & 0x7f);//BITS(7);\n            //--- DROPBITS(7) ---//\n            hold >>>= 7;\n            bits -= 7;\n            //---//\n          }\n          if (state.have + copy > state.nlen + state.ndist) {\n            strm.msg = 'invalid bit length repeat';\n            state.mode = BAD;\n            break;\n          }\n          while (copy--) {\n            state.lens[state.have++] = len;\n          }\n        }\n      }\n\n      /* handle error breaks in while */\n      if (state.mode === BAD) { break; }\n\n      /* check for end-of-block code (better have one) */\n      if (state.lens[256] === 0) {\n        strm.msg = 'invalid code -- missing end-of-block';\n        state.mode = BAD;\n        break;\n      }\n\n      /* build code tables -- note: do not change the lenbits or distbits\n         values here (9 and 6) without reading the comments in inftrees.h\n         concerning the ENOUGH constants, which depend on those values */\n      state.lenbits = 9;\n\n      opts = { bits: state.lenbits };\n      ret = inflate_table(LENS, state.lens, 0, state.nlen, state.lencode, 0, state.work, opts);\n      // We have separate tables & no pointers. 2 commented lines below not needed.\n      // state.next_index = opts.table_index;\n      state.lenbits = opts.bits;\n      // state.lencode = state.next;\n\n      if (ret) {\n        strm.msg = 'invalid literal/lengths set';\n        state.mode = BAD;\n        break;\n      }\n\n      state.distbits = 6;\n      //state.distcode.copy(state.codes);\n      // Switch to use dynamic table\n      state.distcode = state.distdyn;\n      opts = { bits: state.distbits };\n      ret = inflate_table(DISTS, state.lens, state.nlen, state.ndist, state.distcode, 0, state.work, opts);\n      // We have separate tables & no pointers. 2 commented lines below not needed.\n      // state.next_index = opts.table_index;\n      state.distbits = opts.bits;\n      // state.distcode = state.next;\n\n      if (ret) {\n        strm.msg = 'invalid distances set';\n        state.mode = BAD;\n        break;\n      }\n      //Tracev((stderr, 'inflate:       codes ok\\n'));\n      state.mode = LEN_;\n      if (flush === Z_TREES) { break inf_leave; }\n      /* falls through */\n    case LEN_:\n      state.mode = LEN;\n      /* falls through */\n    case LEN:\n      if (have >= 6 && left >= 258) {\n        //--- RESTORE() ---\n        strm.next_out = put;\n        strm.avail_out = left;\n        strm.next_in = next;\n        strm.avail_in = have;\n        state.hold = hold;\n        state.bits = bits;\n        //---\n        inflate_fast(strm, _out);\n        //--- LOAD() ---\n        put = strm.next_out;\n        output = strm.output;\n        left = strm.avail_out;\n        next = strm.next_in;\n        input = strm.input;\n        have = strm.avail_in;\n        hold = state.hold;\n        bits = state.bits;\n        //---\n\n        if (state.mode === TYPE) {\n          state.back = -1;\n        }\n        break;\n      }\n      state.back = 0;\n      for (;;) {\n        here = state.lencode[hold & ((1 << state.lenbits) - 1)];  /*BITS(state.lenbits)*/\n        here_bits = here >>> 24;\n        here_op = (here >>> 16) & 0xff;\n        here_val = here & 0xffff;\n\n        if (here_bits <= bits) { break; }\n        //--- PULLBYTE() ---//\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n        //---//\n      }\n      if (here_op && (here_op & 0xf0) === 0) {\n        last_bits = here_bits;\n        last_op = here_op;\n        last_val = here_val;\n        for (;;) {\n          here = state.lencode[last_val +\n                  ((hold & ((1 << (last_bits + last_op)) - 1))/*BITS(last.bits + last.op)*/ >> last_bits)];\n          here_bits = here >>> 24;\n          here_op = (here >>> 16) & 0xff;\n          here_val = here & 0xffff;\n\n          if ((last_bits + here_bits) <= bits) { break; }\n          //--- PULLBYTE() ---//\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n          //---//\n        }\n        //--- DROPBITS(last.bits) ---//\n        hold >>>= last_bits;\n        bits -= last_bits;\n        //---//\n        state.back += last_bits;\n      }\n      //--- DROPBITS(here.bits) ---//\n      hold >>>= here_bits;\n      bits -= here_bits;\n      //---//\n      state.back += here_bits;\n      state.length = here_val;\n      if (here_op === 0) {\n        //Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?\n        //        \"inflate:         literal '%c'\\n\" :\n        //        \"inflate:         literal 0x%02x\\n\", here.val));\n        state.mode = LIT;\n        break;\n      }\n      if (here_op & 32) {\n        //Tracevv((stderr, \"inflate:         end of block\\n\"));\n        state.back = -1;\n        state.mode = TYPE;\n        break;\n      }\n      if (here_op & 64) {\n        strm.msg = 'invalid literal/length code';\n        state.mode = BAD;\n        break;\n      }\n      state.extra = here_op & 15;\n      state.mode = LENEXT;\n      /* falls through */\n    case LENEXT:\n      if (state.extra) {\n        //=== NEEDBITS(state.extra);\n        n = state.extra;\n        while (bits < n) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        state.length += hold & ((1 << state.extra) - 1)/*BITS(state.extra)*/;\n        //--- DROPBITS(state.extra) ---//\n        hold >>>= state.extra;\n        bits -= state.extra;\n        //---//\n        state.back += state.extra;\n      }\n      //Tracevv((stderr, \"inflate:         length %u\\n\", state.length));\n      state.was = state.length;\n      state.mode = DIST;\n      /* falls through */\n    case DIST:\n      for (;;) {\n        here = state.distcode[hold & ((1 << state.distbits) - 1)];/*BITS(state.distbits)*/\n        here_bits = here >>> 24;\n        here_op = (here >>> 16) & 0xff;\n        here_val = here & 0xffff;\n\n        if ((here_bits) <= bits) { break; }\n        //--- PULLBYTE() ---//\n        if (have === 0) { break inf_leave; }\n        have--;\n        hold += input[next++] << bits;\n        bits += 8;\n        //---//\n      }\n      if ((here_op & 0xf0) === 0) {\n        last_bits = here_bits;\n        last_op = here_op;\n        last_val = here_val;\n        for (;;) {\n          here = state.distcode[last_val +\n                  ((hold & ((1 << (last_bits + last_op)) - 1))/*BITS(last.bits + last.op)*/ >> last_bits)];\n          here_bits = here >>> 24;\n          here_op = (here >>> 16) & 0xff;\n          here_val = here & 0xffff;\n\n          if ((last_bits + here_bits) <= bits) { break; }\n          //--- PULLBYTE() ---//\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n          //---//\n        }\n        //--- DROPBITS(last.bits) ---//\n        hold >>>= last_bits;\n        bits -= last_bits;\n        //---//\n        state.back += last_bits;\n      }\n      //--- DROPBITS(here.bits) ---//\n      hold >>>= here_bits;\n      bits -= here_bits;\n      //---//\n      state.back += here_bits;\n      if (here_op & 64) {\n        strm.msg = 'invalid distance code';\n        state.mode = BAD;\n        break;\n      }\n      state.offset = here_val;\n      state.extra = (here_op) & 15;\n      state.mode = DISTEXT;\n      /* falls through */\n    case DISTEXT:\n      if (state.extra) {\n        //=== NEEDBITS(state.extra);\n        n = state.extra;\n        while (bits < n) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        state.offset += hold & ((1 << state.extra) - 1)/*BITS(state.extra)*/;\n        //--- DROPBITS(state.extra) ---//\n        hold >>>= state.extra;\n        bits -= state.extra;\n        //---//\n        state.back += state.extra;\n      }\n//#ifdef INFLATE_STRICT\n      if (state.offset > state.dmax) {\n        strm.msg = 'invalid distance too far back';\n        state.mode = BAD;\n        break;\n      }\n//#endif\n      //Tracevv((stderr, \"inflate:         distance %u\\n\", state.offset));\n      state.mode = MATCH;\n      /* falls through */\n    case MATCH:\n      if (left === 0) { break inf_leave; }\n      copy = _out - left;\n      if (state.offset > copy) {         /* copy from window */\n        copy = state.offset - copy;\n        if (copy > state.whave) {\n          if (state.sane) {\n            strm.msg = 'invalid distance too far back';\n            state.mode = BAD;\n            break;\n          }\n// (!) This block is disabled in zlib defailts,\n// don't enable it for binary compatibility\n//#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR\n//          Trace((stderr, \"inflate.c too far\\n\"));\n//          copy -= state.whave;\n//          if (copy > state.length) { copy = state.length; }\n//          if (copy > left) { copy = left; }\n//          left -= copy;\n//          state.length -= copy;\n//          do {\n//            output[put++] = 0;\n//          } while (--copy);\n//          if (state.length === 0) { state.mode = LEN; }\n//          break;\n//#endif\n        }\n        if (copy > state.wnext) {\n          copy -= state.wnext;\n          from = state.wsize - copy;\n        }\n        else {\n          from = state.wnext - copy;\n        }\n        if (copy > state.length) { copy = state.length; }\n        from_source = state.window;\n      }\n      else {                              /* copy from output */\n        from_source = output;\n        from = put - state.offset;\n        copy = state.length;\n      }\n      if (copy > left) { copy = left; }\n      left -= copy;\n      state.length -= copy;\n      do {\n        output[put++] = from_source[from++];\n      } while (--copy);\n      if (state.length === 0) { state.mode = LEN; }\n      break;\n    case LIT:\n      if (left === 0) { break inf_leave; }\n      output[put++] = state.length;\n      left--;\n      state.mode = LEN;\n      break;\n    case CHECK:\n      if (state.wrap) {\n        //=== NEEDBITS(32);\n        while (bits < 32) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          // Use '|' insdead of '+' to make sure that result is signed\n          hold |= input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        _out -= left;\n        strm.total_out += _out;\n        state.total += _out;\n        if (_out) {\n          strm.adler = state.check =\n              /*UPDATE(state.check, put - _out, _out);*/\n              (state.flags ? crc32(state.check, output, _out, put - _out) : adler32(state.check, output, _out, put - _out));\n\n        }\n        _out = left;\n        // NB: crc32 stored as signed 32-bit int, zswap32 returns signed too\n        if ((state.flags ? hold : zswap32(hold)) !== state.check) {\n          strm.msg = 'incorrect data check';\n          state.mode = BAD;\n          break;\n        }\n        //=== INITBITS();\n        hold = 0;\n        bits = 0;\n        //===//\n        //Tracev((stderr, \"inflate:   check matches trailer\\n\"));\n      }\n      state.mode = LENGTH;\n      /* falls through */\n    case LENGTH:\n      if (state.wrap && state.flags) {\n        //=== NEEDBITS(32);\n        while (bits < 32) {\n          if (have === 0) { break inf_leave; }\n          have--;\n          hold += input[next++] << bits;\n          bits += 8;\n        }\n        //===//\n        if (hold !== (state.total & 0xffffffff)) {\n          strm.msg = 'incorrect length check';\n          state.mode = BAD;\n          break;\n        }\n        //=== INITBITS();\n        hold = 0;\n        bits = 0;\n        //===//\n        //Tracev((stderr, \"inflate:   length matches trailer\\n\"));\n      }\n      state.mode = DONE;\n      /* falls through */\n    case DONE:\n      ret = Z_STREAM_END;\n      break inf_leave;\n    case BAD:\n      ret = Z_DATA_ERROR;\n      break inf_leave;\n    case MEM:\n      return Z_MEM_ERROR;\n    case SYNC:\n      /* falls through */\n    default:\n      return Z_STREAM_ERROR;\n    }\n  }\n\n  // inf_leave <- here is real place for \"goto inf_leave\", emulated via \"break inf_leave\"\n\n  /*\n     Return from inflate(), updating the total counts and the check value.\n     If there was no progress during the inflate() call, return a buffer\n     error.  Call updatewindow() to create and/or update the window state.\n     Note: a memory error from inflate() is non-recoverable.\n   */\n\n  //--- RESTORE() ---\n  strm.next_out = put;\n  strm.avail_out = left;\n  strm.next_in = next;\n  strm.avail_in = have;\n  state.hold = hold;\n  state.bits = bits;\n  //---\n\n  if (state.wsize || (_out !== strm.avail_out && state.mode < BAD &&\n                      (state.mode < CHECK || flush !== Z_FINISH))) {\n    if (updatewindow(strm, strm.output, strm.next_out, _out - strm.avail_out)) {\n      state.mode = MEM;\n      return Z_MEM_ERROR;\n    }\n  }\n  _in -= strm.avail_in;\n  _out -= strm.avail_out;\n  strm.total_in += _in;\n  strm.total_out += _out;\n  state.total += _out;\n  if (state.wrap && _out) {\n    strm.adler = state.check = /*UPDATE(state.check, strm.next_out - _out, _out);*/\n      (state.flags ? crc32(state.check, output, _out, strm.next_out - _out) : adler32(state.check, output, _out, strm.next_out - _out));\n  }\n  strm.data_type = state.bits + (state.last ? 64 : 0) +\n                    (state.mode === TYPE ? 128 : 0) +\n                    (state.mode === LEN_ || state.mode === COPY_ ? 256 : 0);\n  if (((_in === 0 && _out === 0) || flush === Z_FINISH) && ret === Z_OK) {\n    ret = Z_BUF_ERROR;\n  }\n  return ret;\n}\n\nfunction inflateEnd(strm) {\n\n  if (!strm || !strm.state /*|| strm->zfree == (free_func)0*/) {\n    return Z_STREAM_ERROR;\n  }\n\n  var state = strm.state;\n  if (state.window) {\n    state.window = null;\n  }\n  strm.state = null;\n  return Z_OK;\n}\n\nfunction inflateGetHeader(strm, head) {\n  var state;\n\n  /* check state */\n  if (!strm || !strm.state) { return Z_STREAM_ERROR; }\n  state = strm.state;\n  if ((state.wrap & 2) === 0) { return Z_STREAM_ERROR; }\n\n  /* save header structure */\n  state.head = head;\n  head.done = false;\n  return Z_OK;\n}\n\nfunction inflateSetDictionary(strm, dictionary) {\n  var dictLength = dictionary.length;\n\n  var state;\n  var dictid;\n  var ret;\n\n  /* check state */\n  if (!strm /* == Z_NULL */ || !strm.state /* == Z_NULL */) { return Z_STREAM_ERROR; }\n  state = strm.state;\n\n  if (state.wrap !== 0 && state.mode !== DICT) {\n    return Z_STREAM_ERROR;\n  }\n\n  /* check for correct dictionary identifier */\n  if (state.mode === DICT) {\n    dictid = 1; /* adler32(0, null, 0)*/\n    /* dictid = adler32(dictid, dictionary, dictLength); */\n    dictid = adler32(dictid, dictionary, dictLength, 0);\n    if (dictid !== state.check) {\n      return Z_DATA_ERROR;\n    }\n  }\n  /* copy dictionary to window using updatewindow(), which will amend the\n   existing dictionary if appropriate */\n  ret = updatewindow(strm, dictionary, dictLength, dictLength);\n  if (ret) {\n    state.mode = MEM;\n    return Z_MEM_ERROR;\n  }\n  state.havedict = 1;\n  // Tracev((stderr, \"inflate:   dictionary set\\n\"));\n  return Z_OK;\n}\n\nexports.inflateReset = inflateReset;\nexports.inflateReset2 = inflateReset2;\nexports.inflateResetKeep = inflateResetKeep;\nexports.inflateInit = inflateInit;\nexports.inflateInit2 = inflateInit2;\nexports.inflate = inflate;\nexports.inflateEnd = inflateEnd;\nexports.inflateGetHeader = inflateGetHeader;\nexports.inflateSetDictionary = inflateSetDictionary;\nexports.inflateInfo = 'pako inflate (from Nodeca project)';\n\n/* Not implemented\nexports.inflateCopy = inflateCopy;\nexports.inflateGetDictionary = inflateGetDictionary;\nexports.inflateMark = inflateMark;\nexports.inflatePrime = inflatePrime;\nexports.inflateSync = inflateSync;\nexports.inflateSyncPoint = inflateSyncPoint;\nexports.inflateUndermine = inflateUndermine;\n*/\n",
-    "'use strict';\n\n\nvar utils = require('../utils/common');\n\nvar MAXBITS = 15;\nvar ENOUGH_LENS = 852;\nvar ENOUGH_DISTS = 592;\n//var ENOUGH = (ENOUGH_LENS+ENOUGH_DISTS);\n\nvar CODES = 0;\nvar LENS = 1;\nvar DISTS = 2;\n\nvar lbase = [ /* Length codes 257..285 base */\n  3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,\n  35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0\n];\n\nvar lext = [ /* Length codes 257..285 extra */\n  16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,\n  19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78\n];\n\nvar dbase = [ /* Distance codes 0..29 base */\n  1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,\n  257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,\n  8193, 12289, 16385, 24577, 0, 0\n];\n\nvar dext = [ /* Distance codes 0..29 extra */\n  16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,\n  23, 23, 24, 24, 25, 25, 26, 26, 27, 27,\n  28, 28, 29, 29, 64, 64\n];\n\nmodule.exports = function inflate_table(type, lens, lens_index, codes, table, table_index, work, opts)\n{\n  var bits = opts.bits;\n      //here = opts.here; /* table entry for duplication */\n\n  var len = 0;               /* a code's length in bits */\n  var sym = 0;               /* index of code symbols */\n  var min = 0, max = 0;          /* minimum and maximum code lengths */\n  var root = 0;              /* number of index bits for root table */\n  var curr = 0;              /* number of index bits for current table */\n  var drop = 0;              /* code bits to drop for sub-table */\n  var left = 0;                   /* number of prefix codes available */\n  var used = 0;              /* code entries in table used */\n  var huff = 0;              /* Huffman code */\n  var incr;              /* for incrementing code, index */\n  var fill;              /* index for replicating entries */\n  var low;               /* low bits for current root entry */\n  var mask;              /* mask for low root bits */\n  var next;             /* next available space in table */\n  var base = null;     /* base value table to use */\n  var base_index = 0;\n//  var shoextra;    /* extra bits table to use */\n  var end;                    /* use base and extra for symbol > end */\n  var count = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];    /* number of codes of each length */\n  var offs = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];     /* offsets in table for each length */\n  var extra = null;\n  var extra_index = 0;\n\n  var here_bits, here_op, here_val;\n\n  /*\n   Process a set of code lengths to create a canonical Huffman code.  The\n   code lengths are lens[0..codes-1].  Each length corresponds to the\n   symbols 0..codes-1.  The Huffman code is generated by first sorting the\n   symbols by length from short to long, and retaining the symbol order\n   for codes with equal lengths.  Then the code starts with all zero bits\n   for the first code of the shortest length, and the codes are integer\n   increments for the same length, and zeros are appended as the length\n   increases.  For the deflate format, these bits are stored backwards\n   from their more natural integer increment ordering, and so when the\n   decoding tables are built in the large loop below, the integer codes\n   are incremented backwards.\n\n   This routine assumes, but does not check, that all of the entries in\n   lens[] are in the range 0..MAXBITS.  The caller must assure this.\n   1..MAXBITS is interpreted as that code length.  zero means that that\n   symbol does not occur in this code.\n\n   The codes are sorted by computing a count of codes for each length,\n   creating from that a table of starting indices for each length in the\n   sorted table, and then entering the symbols in order in the sorted\n   table.  The sorted table is work[], with that space being provided by\n   the caller.\n\n   The length counts are used for other purposes as well, i.e. finding\n   the minimum and maximum length codes, determining if there are any\n   codes at all, checking for a valid set of lengths, and looking ahead\n   at length counts to determine sub-table sizes when building the\n   decoding tables.\n   */\n\n  /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */\n  for (len = 0; len <= MAXBITS; len++) {\n    count[len] = 0;\n  }\n  for (sym = 0; sym < codes; sym++) {\n    count[lens[lens_index + sym]]++;\n  }\n\n  /* bound code lengths, force root to be within code lengths */\n  root = bits;\n  for (max = MAXBITS; max >= 1; max--) {\n    if (count[max] !== 0) { break; }\n  }\n  if (root > max) {\n    root = max;\n  }\n  if (max === 0) {                     /* no symbols to code at all */\n    //table.op[opts.table_index] = 64;  //here.op = (var char)64;    /* invalid code marker */\n    //table.bits[opts.table_index] = 1;   //here.bits = (var char)1;\n    //table.val[opts.table_index++] = 0;   //here.val = (var short)0;\n    table[table_index++] = (1 << 24) | (64 << 16) | 0;\n\n\n    //table.op[opts.table_index] = 64;\n    //table.bits[opts.table_index] = 1;\n    //table.val[opts.table_index++] = 0;\n    table[table_index++] = (1 << 24) | (64 << 16) | 0;\n\n    opts.bits = 1;\n    return 0;     /* no symbols, but wait for decoding to report error */\n  }\n  for (min = 1; min < max; min++) {\n    if (count[min] !== 0) { break; }\n  }\n  if (root < min) {\n    root = min;\n  }\n\n  /* check for an over-subscribed or incomplete set of lengths */\n  left = 1;\n  for (len = 1; len <= MAXBITS; len++) {\n    left <<= 1;\n    left -= count[len];\n    if (left < 0) {\n      return -1;\n    }        /* over-subscribed */\n  }\n  if (left > 0 && (type === CODES || max !== 1)) {\n    return -1;                      /* incomplete set */\n  }\n\n  /* generate offsets into symbol table for each length for sorting */\n  offs[1] = 0;\n  for (len = 1; len < MAXBITS; len++) {\n    offs[len + 1] = offs[len] + count[len];\n  }\n\n  /* sort symbols by length, by symbol order within each length */\n  for (sym = 0; sym < codes; sym++) {\n    if (lens[lens_index + sym] !== 0) {\n      work[offs[lens[lens_index + sym]]++] = sym;\n    }\n  }\n\n  /*\n   Create and fill in decoding tables.  In this loop, the table being\n   filled is at next and has curr index bits.  The code being used is huff\n   with length len.  That code is converted to an index by dropping drop\n   bits off of the bottom.  For codes where len is less than drop + curr,\n   those top drop + curr - len bits are incremented through all values to\n   fill the table with replicated entries.\n\n   root is the number of index bits for the root table.  When len exceeds\n   root, sub-tables are created pointed to by the root entry with an index\n   of the low root bits of huff.  This is saved in low to check for when a\n   new sub-table should be started.  drop is zero when the root table is\n   being filled, and drop is root when sub-tables are being filled.\n\n   When a new sub-table is needed, it is necessary to look ahead in the\n   code lengths to determine what size sub-table is needed.  The length\n   counts are used for this, and so count[] is decremented as codes are\n   entered in the tables.\n\n   used keeps track of how many table entries have been allocated from the\n   provided *table space.  It is checked for LENS and DIST tables against\n   the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in\n   the initial root table size constants.  See the comments in inftrees.h\n   for more information.\n\n   sym increments through all symbols, and the loop terminates when\n   all codes of length max, i.e. all codes, have been processed.  This\n   routine permits incomplete codes, so another loop after this one fills\n   in the rest of the decoding tables with invalid code markers.\n   */\n\n  /* set up for code type */\n  // poor man optimization - use if-else instead of switch,\n  // to avoid deopts in old v8\n  if (type === CODES) {\n    base = extra = work;    /* dummy value--not used */\n    end = 19;\n\n  } else if (type === LENS) {\n    base = lbase;\n    base_index -= 257;\n    extra = lext;\n    extra_index -= 257;\n    end = 256;\n\n  } else {                    /* DISTS */\n    base = dbase;\n    extra = dext;\n    end = -1;\n  }\n\n  /* initialize opts for loop */\n  huff = 0;                   /* starting code */\n  sym = 0;                    /* starting code symbol */\n  len = min;                  /* starting code length */\n  next = table_index;              /* current table to fill in */\n  curr = root;                /* current table index bits */\n  drop = 0;                   /* current bits to drop from code for index */\n  low = -1;                   /* trigger new sub-table when len > root */\n  used = 1 << root;          /* use root table entries */\n  mask = used - 1;            /* mask for comparing low */\n\n  /* check available table space */\n  if ((type === LENS && used > ENOUGH_LENS) ||\n    (type === DISTS && used > ENOUGH_DISTS)) {\n    return 1;\n  }\n\n  /* process all codes and make table entries */\n  for (;;) {\n    /* create table entry */\n    here_bits = len - drop;\n    if (work[sym] < end) {\n      here_op = 0;\n      here_val = work[sym];\n    }\n    else if (work[sym] > end) {\n      here_op = extra[extra_index + work[sym]];\n      here_val = base[base_index + work[sym]];\n    }\n    else {\n      here_op = 32 + 64;         /* end of block */\n      here_val = 0;\n    }\n\n    /* replicate for those indices with low len bits equal to huff */\n    incr = 1 << (len - drop);\n    fill = 1 << curr;\n    min = fill;                 /* save offset to next table */\n    do {\n      fill -= incr;\n      table[next + (huff >> drop) + fill] = (here_bits << 24) | (here_op << 16) | here_val |0;\n    } while (fill !== 0);\n\n    /* backwards increment the len-bit code huff */\n    incr = 1 << (len - 1);\n    while (huff & incr) {\n      incr >>= 1;\n    }\n    if (incr !== 0) {\n      huff &= incr - 1;\n      huff += incr;\n    } else {\n      huff = 0;\n    }\n\n    /* go to next symbol, update count, len */\n    sym++;\n    if (--count[len] === 0) {\n      if (len === max) { break; }\n      len = lens[lens_index + work[sym]];\n    }\n\n    /* create new sub-table if needed */\n    if (len > root && (huff & mask) !== low) {\n      /* if first time, transition to sub-tables */\n      if (drop === 0) {\n        drop = root;\n      }\n\n      /* increment past last table */\n      next += min;            /* here min is 1 << curr */\n\n      /* determine length of next table */\n      curr = len - drop;\n      left = 1 << curr;\n      while (curr + drop < max) {\n        left -= count[curr + drop];\n        if (left <= 0) { break; }\n        curr++;\n        left <<= 1;\n      }\n\n      /* check for enough space */\n      used += 1 << curr;\n      if ((type === LENS && used > ENOUGH_LENS) ||\n        (type === DISTS && used > ENOUGH_DISTS)) {\n        return 1;\n      }\n\n      /* point entry in root table to sub-table */\n      low = huff & mask;\n      /*table.op[low] = curr;\n      table.bits[low] = root;\n      table.val[low] = next - opts.table_index;*/\n      table[low] = (root << 24) | (curr << 16) | (next - table_index) |0;\n    }\n  }\n\n  /* fill in remaining table entry if code is incomplete (guaranteed to have\n   at most one remaining entry, since if the code is incomplete, the\n   maximum code length that was allowed to get this far is one bit) */\n  if (huff !== 0) {\n    //table.op[next + huff] = 64;            /* invalid code marker */\n    //table.bits[next + huff] = len - drop;\n    //table.val[next + huff] = 0;\n    table[next + huff] = ((len - drop) << 24) | (64 << 16) |0;\n  }\n\n  /* set return parameters */\n  //opts.table_index += used;\n  opts.bits = root;\n  return 0;\n};\n",
+    "'use strict';\n\n\nvar utils = require('../utils/common');\n\nvar MAXBITS = 15;\nvar ENOUGH_LENS = 852;\nvar ENOUGH_DISTS = 592;\n//var ENOUGH = (ENOUGH_LENS+ENOUGH_DISTS);\n\nvar CODES = 0;\nvar LENS = 1;\nvar DISTS = 2;\n\nvar lbase = [ /* Length codes 257..285 base */\n  3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,\n  35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0\n];\n\nvar lext = [ /* Length codes 257..285 extra */\n  16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,\n  19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78\n];\n\nvar dbase = [ /* Distance codes 0..29 base */\n  1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,\n  257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,\n  8193, 12289, 16385, 24577, 0, 0\n];\n\nvar dext = [ /* Distance codes 0..29 extra */\n  16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,\n  23, 23, 24, 24, 25, 25, 26, 26, 27, 27,\n  28, 28, 29, 29, 64, 64\n];\n\nmodule.exports = function inflate_table(type, lens, lens_index, codes, table, table_index, work, opts)\n{\n  var bits = opts.bits;\n      //here = opts.here; /* table entry for duplication */\n\n  var len = 0;               /* a code's length in bits */\n  var sym = 0;               /* index of code symbols */\n  var min = 0, max = 0;          /* minimum and maximum code lengths */\n  var root = 0;              /* number of index bits for root table */\n  var curr = 0;              /* number of index bits for current table */\n  var drop = 0;              /* code bits to drop for sub-table */\n  var left = 0;                   /* number of prefix codes available */\n  var used = 0;              /* code entries in table used */\n  var huff = 0;              /* Huffman code */\n  var incr;              /* for incrementing code, index */\n  var fill;              /* index for replicating entries */\n  var low;               /* low bits for current root entry */\n  var mask;              /* mask for low root bits */\n  var next;             /* next available space in table */\n  var base = null;     /* base value table to use */\n  var base_index = 0;\n//  var shoextra;    /* extra bits table to use */\n  var end;                    /* use base and extra for symbol > end */\n  var count = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];    /* number of codes of each length */\n  var offs = new utils.Buf16(MAXBITS + 1); //[MAXBITS+1];     /* offsets in table for each length */\n  var extra = null;\n  var extra_index = 0;\n\n  var here_bits, here_op, here_val;\n\n  /*\n   Process a set of code lengths to create a canonical Huffman code.  The\n   code lengths are lens[0..codes-1].  Each length corresponds to the\n   symbols 0..codes-1.  The Huffman code is generated by first sorting the\n   symbols by length from short to long, and retaining the symbol order\n   for codes with equal lengths.  Then the code starts with all zero bits\n   for the first code of the shortest length, and the codes are integer\n   increments for the same length, and zeros are appended as the length\n   increases.  For the deflate format, these bits are stored backwards\n   from their more natural integer increment ordering, and so when the\n   decoding tables are built in the large loop below, the integer codes\n   are incremented backwards.\n\n   This routine assumes, but does not check, that all of the entries in\n   lens[] are in the range 0..MAXBITS.  The caller must assure this.\n   1..MAXBITS is interpreted as that code length.  zero means that that\n   symbol does not occur in this code.\n\n   The codes are sorted by computing a count of codes for each length,\n   creating from that a table of starting indices for each length in the\n   sorted table, and then entering the symbols in order in the sorted\n   table.  The sorted table is work[], with that space being provided by\n   the caller.\n\n   The length counts are used for other purposes as well, i.e. finding\n   the minimum and maximum length codes, determining if there are any\n   codes at all, checking for a valid set of lengths, and looking ahead\n   at length counts to determine sub-table sizes when building the\n   decoding tables.\n   */\n\n  /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */\n  for (len = 0; len <= MAXBITS; len++) {\n    count[len] = 0;\n  }\n  for (sym = 0; sym < codes; sym++) {\n    count[lens[lens_index + sym]]++;\n  }\n\n  /* bound code lengths, force root to be within code lengths */\n  root = bits;\n  for (max = MAXBITS; max >= 1; max--) {\n    if (count[max] !== 0) { break; }\n  }\n  if (root > max) {\n    root = max;\n  }\n  if (max === 0) {                     /* no symbols to code at all */\n    //table.op[opts.table_index] = 64;  //here.op = (var char)64;    /* invalid code marker */\n    //table.bits[opts.table_index] = 1;   //here.bits = (var char)1;\n    //table.val[opts.table_index++] = 0;   //here.val = (var short)0;\n    table[table_index++] = (1 << 24) | (64 << 16) | 0;\n\n\n    //table.op[opts.table_index] = 64;\n    //table.bits[opts.table_index] = 1;\n    //table.val[opts.table_index++] = 0;\n    table[table_index++] = (1 << 24) | (64 << 16) | 0;\n\n    opts.bits = 1;\n    return 0;     /* no symbols, but wait for decoding to report error */\n  }\n  for (min = 1; min < max; min++) {\n    if (count[min] !== 0) { break; }\n  }\n  if (root < min) {\n    root = min;\n  }\n\n  /* check for an over-subscribed or incomplete set of lengths */\n  left = 1;\n  for (len = 1; len <= MAXBITS; len++) {\n    left <<= 1;\n    left -= count[len];\n    if (left < 0) {\n      return -1;\n    }        /* over-subscribed */\n  }\n  if (left > 0 && (type === CODES || max !== 1)) {\n    return -1;                      /* incomplete set */\n  }\n\n  /* generate offsets into symbol table for each length for sorting */\n  offs[1] = 0;\n  for (len = 1; len < MAXBITS; len++) {\n    offs[len + 1] = offs[len] + count[len];\n  }\n\n  /* sort symbols by length, by symbol order within each length */\n  for (sym = 0; sym < codes; sym++) {\n    if (lens[lens_index + sym] !== 0) {\n      work[offs[lens[lens_index + sym]]++] = sym;\n    }\n  }\n\n  /*\n   Create and fill in decoding tables.  In this loop, the table being\n   filled is at next and has curr index bits.  The code being used is huff\n   with length len.  That code is converted to an index by dropping drop\n   bits off of the bottom.  For codes where len is less than drop + curr,\n   those top drop + curr - len bits are incremented through all values to\n   fill the table with replicated entries.\n\n   root is the number of index bits for the root table.  When len exceeds\n   root, sub-tables are created pointed to by the root entry with an index\n   of the low root bits of huff.  This is saved in low to check for when a\n   new sub-table should be started.  drop is zero when the root table is\n   being filled, and drop is root when sub-tables are being filled.\n\n   When a new sub-table is needed, it is necessary to look ahead in the\n   code lengths to determine what size sub-table is needed.  The length\n   counts are used for this, and so count[] is decremented as codes are\n   entered in the tables.\n\n   used keeps track of how many table entries have been allocated from the\n   provided *table space.  It is checked for LENS and DIST tables against\n   the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in\n   the initial root table size constants.  See the comments in inftrees.h\n   for more information.\n\n   sym increments through all symbols, and the loop terminates when\n   all codes of length max, i.e. all codes, have been processed.  This\n   routine permits incomplete codes, so another loop after this one fills\n   in the rest of the decoding tables with invalid code markers.\n   */\n\n  /* set up for code type */\n  // poor man optimization - use if-else instead of switch,\n  // to avoid deopts in old v8\n  if (type === CODES) {\n    base = extra = work;    /* dummy value--not used */\n    end = 19;\n\n  } else if (type === LENS) {\n    base = lbase;\n    base_index -= 257;\n    extra = lext;\n    extra_index -= 257;\n    end = 256;\n\n  } else {                    /* DISTS */\n    base = dbase;\n    extra = dext;\n    end = -1;\n  }\n\n  /* initialize opts for loop */\n  huff = 0;                   /* starting code */\n  sym = 0;                    /* starting code symbol */\n  len = min;                  /* starting code length */\n  next = table_index;              /* current table to fill in */\n  curr = root;                /* current table index bits */\n  drop = 0;                   /* current bits to drop from code for index */\n  low = -1;                   /* trigger new sub-table when len > root */\n  used = 1 << root;          /* use root table entries */\n  mask = used - 1;            /* mask for comparing low */\n\n  /* check available table space */\n  if ((type === LENS && used > ENOUGH_LENS) ||\n    (type === DISTS && used > ENOUGH_DISTS)) {\n    return 1;\n  }\n\n  var i = 0;\n  /* process all codes and make table entries */\n  for (;;) {\n    i++;\n    /* create table entry */\n    here_bits = len - drop;\n    if (work[sym] < end) {\n      here_op = 0;\n      here_val = work[sym];\n    }\n    else if (work[sym] > end) {\n      here_op = extra[extra_index + work[sym]];\n      here_val = base[base_index + work[sym]];\n    }\n    else {\n      here_op = 32 + 64;         /* end of block */\n      here_val = 0;\n    }\n\n    /* replicate for those indices with low len bits equal to huff */\n    incr = 1 << (len - drop);\n    fill = 1 << curr;\n    min = fill;                 /* save offset to next table */\n    do {\n      fill -= incr;\n      table[next + (huff >> drop) + fill] = (here_bits << 24) | (here_op << 16) | here_val |0;\n    } while (fill !== 0);\n\n    /* backwards increment the len-bit code huff */\n    incr = 1 << (len - 1);\n    while (huff & incr) {\n      incr >>= 1;\n    }\n    if (incr !== 0) {\n      huff &= incr - 1;\n      huff += incr;\n    } else {\n      huff = 0;\n    }\n\n    /* go to next symbol, update count, len */\n    sym++;\n    if (--count[len] === 0) {\n      if (len === max) { break; }\n      len = lens[lens_index + work[sym]];\n    }\n\n    /* create new sub-table if needed */\n    if (len > root && (huff & mask) !== low) {\n      /* if first time, transition to sub-tables */\n      if (drop === 0) {\n        drop = root;\n      }\n\n      /* increment past last table */\n      next += min;            /* here min is 1 << curr */\n\n      /* determine length of next table */\n      curr = len - drop;\n      left = 1 << curr;\n      while (curr + drop < max) {\n        left -= count[curr + drop];\n        if (left <= 0) { break; }\n        curr++;\n        left <<= 1;\n      }\n\n      /* check for enough space */\n      used += 1 << curr;\n      if ((type === LENS && used > ENOUGH_LENS) ||\n        (type === DISTS && used > ENOUGH_DISTS)) {\n        return 1;\n      }\n\n      /* point entry in root table to sub-table */\n      low = huff & mask;\n      /*table.op[low] = curr;\n      table.bits[low] = root;\n      table.val[low] = next - opts.table_index;*/\n      table[low] = (root << 24) | (curr << 16) | (next - table_index) |0;\n    }\n  }\n\n  /* fill in remaining table entry if code is incomplete (guaranteed to have\n   at most one remaining entry, since if the code is incomplete, the\n   maximum code length that was allowed to get this far is one bit) */\n  if (huff !== 0) {\n    //table.op[next + huff] = 64;            /* invalid code marker */\n    //table.bits[next + huff] = len - drop;\n    //table.val[next + huff] = 0;\n    table[next + huff] = ((len - drop) << 24) | (64 << 16) |0;\n  }\n\n  /* set return parameters */\n  //opts.table_index += used;\n  opts.bits = root;\n  return 0;\n};\n",
     "'use strict';\n\nmodule.exports = {\n  2:      'need dictionary',     /* Z_NEED_DICT       2  */\n  1:      'stream end',          /* Z_STREAM_END      1  */\n  0:      '',                    /* Z_OK              0  */\n  '-1':   'file error',          /* Z_ERRNO         (-1) */\n  '-2':   'stream error',        /* Z_STREAM_ERROR  (-2) */\n  '-3':   'data error',          /* Z_DATA_ERROR    (-3) */\n  '-4':   'insufficient memory', /* Z_MEM_ERROR     (-4) */\n  '-5':   'buffer error',        /* Z_BUF_ERROR     (-5) */\n  '-6':   'incompatible version' /* Z_VERSION_ERROR (-6) */\n};\n",
     "'use strict';\n\n\nvar utils = require('../utils/common');\n\n/* Public constants ==========================================================*/\n/* ===========================================================================*/\n\n\n//var Z_FILTERED          = 1;\n//var Z_HUFFMAN_ONLY      = 2;\n//var Z_RLE               = 3;\nvar Z_FIXED               = 4;\n//var Z_DEFAULT_STRATEGY  = 0;\n\n/* Possible values of the data_type field (though see inflate()) */\nvar Z_BINARY              = 0;\nvar Z_TEXT                = 1;\n//var Z_ASCII             = 1; // = Z_TEXT\nvar Z_UNKNOWN             = 2;\n\n/*============================================================================*/\n\n\nfunction zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }\n\n// From zutil.h\n\nvar STORED_BLOCK = 0;\nvar STATIC_TREES = 1;\nvar DYN_TREES    = 2;\n/* The three kinds of block type */\n\nvar MIN_MATCH    = 3;\nvar MAX_MATCH    = 258;\n/* The minimum and maximum match lengths */\n\n// From deflate.h\n/* ===========================================================================\n * Internal compression state.\n */\n\nvar LENGTH_CODES  = 29;\n/* number of length codes, not counting the special END_BLOCK code */\n\nvar LITERALS      = 256;\n/* number of literal bytes 0..255 */\n\nvar L_CODES       = LITERALS + 1 + LENGTH_CODES;\n/* number of Literal or Length codes, including the END_BLOCK code */\n\nvar D_CODES       = 30;\n/* number of distance codes */\n\nvar BL_CODES      = 19;\n/* number of codes used to transfer the bit lengths */\n\nvar HEAP_SIZE     = 2 * L_CODES + 1;\n/* maximum heap size */\n\nvar MAX_BITS      = 15;\n/* All codes must not exceed MAX_BITS bits */\n\nvar Buf_size      = 16;\n/* size of bit buffer in bi_buf */\n\n\n/* ===========================================================================\n * Constants\n */\n\nvar MAX_BL_BITS = 7;\n/* Bit length codes must not exceed MAX_BL_BITS bits */\n\nvar END_BLOCK   = 256;\n/* end of block literal code */\n\nvar REP_3_6     = 16;\n/* repeat previous bit length 3-6 times (2 bits of repeat count) */\n\nvar REPZ_3_10   = 17;\n/* repeat a zero length 3-10 times  (3 bits of repeat count) */\n\nvar REPZ_11_138 = 18;\n/* repeat a zero length 11-138 times  (7 bits of repeat count) */\n\n/* eslint-disable comma-spacing,array-bracket-spacing */\nvar extra_lbits =   /* extra bits for each length code */\n  [0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0];\n\nvar extra_dbits =   /* extra bits for each distance code */\n  [0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13];\n\nvar extra_blbits =  /* extra bits for each bit length code */\n  [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7];\n\nvar bl_order =\n  [16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15];\n/* eslint-enable comma-spacing,array-bracket-spacing */\n\n/* The lengths of the bit length codes are sent in order of decreasing\n * probability, to avoid transmitting the lengths for unused bit length codes.\n */\n\n/* ===========================================================================\n * Local data. These are initialized only once.\n */\n\n// We pre-fill arrays with 0 to avoid uninitialized gaps\n\nvar DIST_CODE_LEN = 512; /* see definition of array dist_code below */\n\n// !!!! Use flat array insdead of structure, Freq = i*2, Len = i*2+1\nvar static_ltree  = new Array((L_CODES + 2) * 2);\nzero(static_ltree);\n/* The static literal tree. Since the bit lengths are imposed, there is no\n * need for the L_CODES extra codes used during heap construction. However\n * The codes 286 and 287 are needed to build a canonical tree (see _tr_init\n * below).\n */\n\nvar static_dtree  = new Array(D_CODES * 2);\nzero(static_dtree);\n/* The static distance tree. (Actually a trivial tree since all codes use\n * 5 bits.)\n */\n\nvar _dist_code    = new Array(DIST_CODE_LEN);\nzero(_dist_code);\n/* Distance codes. The first 256 values correspond to the distances\n * 3 .. 258, the last 256 values correspond to the top 8 bits of\n * the 15 bit distances.\n */\n\nvar _length_code  = new Array(MAX_MATCH - MIN_MATCH + 1);\nzero(_length_code);\n/* length code for each normalized match length (0 == MIN_MATCH) */\n\nvar base_length   = new Array(LENGTH_CODES);\nzero(base_length);\n/* First normalized length for each code (0 = MIN_MATCH) */\n\nvar base_dist     = new Array(D_CODES);\nzero(base_dist);\n/* First normalized distance for each code (0 = distance of 1) */\n\n\nfunction StaticTreeDesc(static_tree, extra_bits, extra_base, elems, max_length) {\n\n  this.static_tree  = static_tree;  /* static tree or NULL */\n  this.extra_bits   = extra_bits;   /* extra bits for each code or NULL */\n  this.extra_base   = extra_base;   /* base index for extra_bits */\n  this.elems        = elems;        /* max number of elements in the tree */\n  this.max_length   = max_length;   /* max bit length for the codes */\n\n  // show if `static_tree` has data or dummy - needed for monomorphic objects\n  this.has_stree    = static_tree && static_tree.length;\n}\n\n\nvar static_l_desc;\nvar static_d_desc;\nvar static_bl_desc;\n\n\nfunction TreeDesc(dyn_tree, stat_desc) {\n  this.dyn_tree = dyn_tree;     /* the dynamic tree */\n  this.max_code = 0;            /* largest code with non zero frequency */\n  this.stat_desc = stat_desc;   /* the corresponding static tree */\n}\n\n\n\nfunction d_code(dist) {\n  return dist < 256 ? _dist_code[dist] : _dist_code[256 + (dist >>> 7)];\n}\n\n\n/* ===========================================================================\n * Output a short LSB first on the stream.\n * IN assertion: there is enough room in pendingBuf.\n */\nfunction put_short(s, w) {\n//    put_byte(s, (uch)((w) & 0xff));\n//    put_byte(s, (uch)((ush)(w) >> 8));\n  s.pending_buf[s.pending++] = (w) & 0xff;\n  s.pending_buf[s.pending++] = (w >>> 8) & 0xff;\n}\n\n\n/* ===========================================================================\n * Send a value on a given number of bits.\n * IN assertion: length <= 16 and value fits in length bits.\n */\nfunction send_bits(s, value, length) {\n  if (s.bi_valid > (Buf_size - length)) {\n    s.bi_buf |= (value << s.bi_valid) & 0xffff;\n    put_short(s, s.bi_buf);\n    s.bi_buf = value >> (Buf_size - s.bi_valid);\n    s.bi_valid += length - Buf_size;\n  } else {\n    s.bi_buf |= (value << s.bi_valid) & 0xffff;\n    s.bi_valid += length;\n  }\n}\n\n\nfunction send_code(s, c, tree) {\n  send_bits(s, tree[c * 2]/*.Code*/, tree[c * 2 + 1]/*.Len*/);\n}\n\n\n/* ===========================================================================\n * Reverse the first len bits of a code, using straightforward code (a faster\n * method would use a table)\n * IN assertion: 1 <= len <= 15\n */\nfunction bi_reverse(code, len) {\n  var res = 0;\n  do {\n    res |= code & 1;\n    code >>>= 1;\n    res <<= 1;\n  } while (--len > 0);\n  return res >>> 1;\n}\n\n\n/* ===========================================================================\n * Flush the bit buffer, keeping at most 7 bits in it.\n */\nfunction bi_flush(s) {\n  if (s.bi_valid === 16) {\n    put_short(s, s.bi_buf);\n    s.bi_buf = 0;\n    s.bi_valid = 0;\n\n  } else if (s.bi_valid >= 8) {\n    s.pending_buf[s.pending++] = s.bi_buf & 0xff;\n    s.bi_buf >>= 8;\n    s.bi_valid -= 8;\n  }\n}\n\n\n/* ===========================================================================\n * Compute the optimal bit lengths for a tree and update the total bit length\n * for the current block.\n * IN assertion: the fields freq and dad are set, heap[heap_max] and\n *    above are the tree nodes sorted by increasing frequency.\n * OUT assertions: the field len is set to the optimal bit length, the\n *     array bl_count contains the frequencies for each bit length.\n *     The length opt_len is updated; static_len is also updated if stree is\n *     not null.\n */\nfunction gen_bitlen(s, desc)\n//    deflate_state *s;\n//    tree_desc *desc;    /* the tree descriptor */\n{\n  var tree            = desc.dyn_tree;\n  var max_code        = desc.max_code;\n  var stree           = desc.stat_desc.static_tree;\n  var has_stree       = desc.stat_desc.has_stree;\n  var extra           = desc.stat_desc.extra_bits;\n  var base            = desc.stat_desc.extra_base;\n  var max_length      = desc.stat_desc.max_length;\n  var h;              /* heap index */\n  var n, m;           /* iterate over the tree elements */\n  var bits;           /* bit length */\n  var xbits;          /* extra bits */\n  var f;              /* frequency */\n  var overflow = 0;   /* number of elements with bit length too large */\n\n  for (bits = 0; bits <= MAX_BITS; bits++) {\n    s.bl_count[bits] = 0;\n  }\n\n  /* In a first pass, compute the optimal bit lengths (which may\n   * overflow in the case of the bit length tree).\n   */\n  tree[s.heap[s.heap_max] * 2 + 1]/*.Len*/ = 0; /* root of the heap */\n\n  for (h = s.heap_max + 1; h < HEAP_SIZE; h++) {\n    n = s.heap[h];\n    bits = tree[tree[n * 2 + 1]/*.Dad*/ * 2 + 1]/*.Len*/ + 1;\n    if (bits > max_length) {\n      bits = max_length;\n      overflow++;\n    }\n    tree[n * 2 + 1]/*.Len*/ = bits;\n    /* We overwrite tree[n].Dad which is no longer needed */\n\n    if (n > max_code) { continue; } /* not a leaf node */\n\n    s.bl_count[bits]++;\n    xbits = 0;\n    if (n >= base) {\n      xbits = extra[n - base];\n    }\n    f = tree[n * 2]/*.Freq*/;\n    s.opt_len += f * (bits + xbits);\n    if (has_stree) {\n      s.static_len += f * (stree[n * 2 + 1]/*.Len*/ + xbits);\n    }\n  }\n  if (overflow === 0) { return; }\n\n  // Trace((stderr,\"\\nbit length overflow\\n\"));\n  /* This happens for example on obj2 and pic of the Calgary corpus */\n\n  /* Find the first bit length which could increase: */\n  do {\n    bits = max_length - 1;\n    while (s.bl_count[bits] === 0) { bits--; }\n    s.bl_count[bits]--;      /* move one leaf down the tree */\n    s.bl_count[bits + 1] += 2; /* move one overflow item as its brother */\n    s.bl_count[max_length]--;\n    /* The brother of the overflow item also moves one step up,\n     * but this does not affect bl_count[max_length]\n     */\n    overflow -= 2;\n  } while (overflow > 0);\n\n  /* Now recompute all bit lengths, scanning in increasing frequency.\n   * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all\n   * lengths instead of fixing only the wrong ones. This idea is taken\n   * from 'ar' written by Haruhiko Okumura.)\n   */\n  for (bits = max_length; bits !== 0; bits--) {\n    n = s.bl_count[bits];\n    while (n !== 0) {\n      m = s.heap[--h];\n      if (m > max_code) { continue; }\n      if (tree[m * 2 + 1]/*.Len*/ !== bits) {\n        // Trace((stderr,\"code %d bits %d->%d\\n\", m, tree[m].Len, bits));\n        s.opt_len += (bits - tree[m * 2 + 1]/*.Len*/) * tree[m * 2]/*.Freq*/;\n        tree[m * 2 + 1]/*.Len*/ = bits;\n      }\n      n--;\n    }\n  }\n}\n\n\n/* ===========================================================================\n * Generate the codes for a given tree and bit counts (which need not be\n * optimal).\n * IN assertion: the array bl_count contains the bit length statistics for\n * the given tree and the field len is set for all tree elements.\n * OUT assertion: the field code is set for all tree elements of non\n *     zero code length.\n */\nfunction gen_codes(tree, max_code, bl_count)\n//    ct_data *tree;             /* the tree to decorate */\n//    int max_code;              /* largest code with non zero frequency */\n//    ushf *bl_count;            /* number of codes at each bit length */\n{\n  var next_code = new Array(MAX_BITS + 1); /* next code value for each bit length */\n  var code = 0;              /* running code value */\n  var bits;                  /* bit index */\n  var n;                     /* code index */\n\n  /* The distribution counts are first used to generate the code values\n   * without bit reversal.\n   */\n  for (bits = 1; bits <= MAX_BITS; bits++) {\n    next_code[bits] = code = (code + bl_count[bits - 1]) << 1;\n  }\n  /* Check that the bit counts in bl_count are consistent. The last code\n   * must be all ones.\n   */\n  //Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,\n  //        \"inconsistent bit counts\");\n  //Tracev((stderr,\"\\ngen_codes: max_code %d \", max_code));\n\n  for (n = 0;  n <= max_code; n++) {\n    var len = tree[n * 2 + 1]/*.Len*/;\n    if (len === 0) { continue; }\n    /* Now reverse the bits */\n    tree[n * 2]/*.Code*/ = bi_reverse(next_code[len]++, len);\n\n    //Tracecv(tree != static_ltree, (stderr,\"\\nn %3d %c l %2d c %4x (%x) \",\n    //     n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));\n  }\n}\n\n\n/* ===========================================================================\n * Initialize the various 'constant' tables.\n */\nfunction tr_static_init() {\n  var n;        /* iterates over tree elements */\n  var bits;     /* bit counter */\n  var length;   /* length value */\n  var code;     /* code value */\n  var dist;     /* distance index */\n  var bl_count = new Array(MAX_BITS + 1);\n  /* number of codes at each bit length for an optimal tree */\n\n  // do check in _tr_init()\n  //if (static_init_done) return;\n\n  /* For some embedded targets, global variables are not initialized: */\n/*#ifdef NO_INIT_GLOBAL_POINTERS\n  static_l_desc.static_tree = static_ltree;\n  static_l_desc.extra_bits = extra_lbits;\n  static_d_desc.static_tree = static_dtree;\n  static_d_desc.extra_bits = extra_dbits;\n  static_bl_desc.extra_bits = extra_blbits;\n#endif*/\n\n  /* Initialize the mapping length (0..255) -> length code (0..28) */\n  length = 0;\n  for (code = 0; code < LENGTH_CODES - 1; code++) {\n    base_length[code] = length;\n    for (n = 0; n < (1 << extra_lbits[code]); n++) {\n      _length_code[length++] = code;\n    }\n  }\n  //Assert (length == 256, \"tr_static_init: length != 256\");\n  /* Note that the length 255 (match length 258) can be represented\n   * in two different ways: code 284 + 5 bits or code 285, so we\n   * overwrite length_code[255] to use the best encoding:\n   */\n  _length_code[length - 1] = code;\n\n  /* Initialize the mapping dist (0..32K) -> dist code (0..29) */\n  dist = 0;\n  for (code = 0; code < 16; code++) {\n    base_dist[code] = dist;\n    for (n = 0; n < (1 << extra_dbits[code]); n++) {\n      _dist_code[dist++] = code;\n    }\n  }\n  //Assert (dist == 256, \"tr_static_init: dist != 256\");\n  dist >>= 7; /* from now on, all distances are divided by 128 */\n  for (; code < D_CODES; code++) {\n    base_dist[code] = dist << 7;\n    for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {\n      _dist_code[256 + dist++] = code;\n    }\n  }\n  //Assert (dist == 256, \"tr_static_init: 256+dist != 512\");\n\n  /* Construct the codes of the static literal tree */\n  for (bits = 0; bits <= MAX_BITS; bits++) {\n    bl_count[bits] = 0;\n  }\n\n  n = 0;\n  while (n <= 143) {\n    static_ltree[n * 2 + 1]/*.Len*/ = 8;\n    n++;\n    bl_count[8]++;\n  }\n  while (n <= 255) {\n    static_ltree[n * 2 + 1]/*.Len*/ = 9;\n    n++;\n    bl_count[9]++;\n  }\n  while (n <= 279) {\n    static_ltree[n * 2 + 1]/*.Len*/ = 7;\n    n++;\n    bl_count[7]++;\n  }\n  while (n <= 287) {\n    static_ltree[n * 2 + 1]/*.Len*/ = 8;\n    n++;\n    bl_count[8]++;\n  }\n  /* Codes 286 and 287 do not exist, but we must include them in the\n   * tree construction to get a canonical Huffman tree (longest code\n   * all ones)\n   */\n  gen_codes(static_ltree, L_CODES + 1, bl_count);\n\n  /* The static distance tree is trivial: */\n  for (n = 0; n < D_CODES; n++) {\n    static_dtree[n * 2 + 1]/*.Len*/ = 5;\n    static_dtree[n * 2]/*.Code*/ = bi_reverse(n, 5);\n  }\n\n  // Now data ready and we can init static trees\n  static_l_desc = new StaticTreeDesc(static_ltree, extra_lbits, LITERALS + 1, L_CODES, MAX_BITS);\n  static_d_desc = new StaticTreeDesc(static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS);\n  static_bl_desc = new StaticTreeDesc(new Array(0), extra_blbits, 0,         BL_CODES, MAX_BL_BITS);\n\n  //static_init_done = true;\n}\n\n\n/* ===========================================================================\n * Initialize a new block.\n */\nfunction init_block(s) {\n  var n; /* iterates over tree elements */\n\n  /* Initialize the trees. */\n  for (n = 0; n < L_CODES;  n++) { s.dyn_ltree[n * 2]/*.Freq*/ = 0; }\n  for (n = 0; n < D_CODES;  n++) { s.dyn_dtree[n * 2]/*.Freq*/ = 0; }\n  for (n = 0; n < BL_CODES; n++) { s.bl_tree[n * 2]/*.Freq*/ = 0; }\n\n  s.dyn_ltree[END_BLOCK * 2]/*.Freq*/ = 1;\n  s.opt_len = s.static_len = 0;\n  s.last_lit = s.matches = 0;\n}\n\n\n/* ===========================================================================\n * Flush the bit buffer and align the output on a byte boundary\n */\nfunction bi_windup(s)\n{\n  if (s.bi_valid > 8) {\n    put_short(s, s.bi_buf);\n  } else if (s.bi_valid > 0) {\n    //put_byte(s, (Byte)s->bi_buf);\n    s.pending_buf[s.pending++] = s.bi_buf;\n  }\n  s.bi_buf = 0;\n  s.bi_valid = 0;\n}\n\n/* ===========================================================================\n * Copy a stored block, storing first the length and its\n * one's complement if requested.\n */\nfunction copy_block(s, buf, len, header)\n//DeflateState *s;\n//charf    *buf;    /* the input data */\n//unsigned len;     /* its length */\n//int      header;  /* true if block header must be written */\n{\n  bi_windup(s);        /* align on byte boundary */\n\n  if (header) {\n    put_short(s, len);\n    put_short(s, ~len);\n  }\n//  while (len--) {\n//    put_byte(s, *buf++);\n//  }\n  utils.arraySet(s.pending_buf, s.window, buf, len, s.pending);\n  s.pending += len;\n}\n\n/* ===========================================================================\n * Compares to subtrees, using the tree depth as tie breaker when\n * the subtrees have equal frequency. This minimizes the worst case length.\n */\nfunction smaller(tree, n, m, depth) {\n  var _n2 = n * 2;\n  var _m2 = m * 2;\n  return (tree[_n2]/*.Freq*/ < tree[_m2]/*.Freq*/ ||\n         (tree[_n2]/*.Freq*/ === tree[_m2]/*.Freq*/ && depth[n] <= depth[m]));\n}\n\n/* ===========================================================================\n * Restore the heap property by moving down the tree starting at node k,\n * exchanging a node with the smallest of its two sons if necessary, stopping\n * when the heap property is re-established (each father smaller than its\n * two sons).\n */\nfunction pqdownheap(s, tree, k)\n//    deflate_state *s;\n//    ct_data *tree;  /* the tree to restore */\n//    int k;               /* node to move down */\n{\n  var v = s.heap[k];\n  var j = k << 1;  /* left son of k */\n  while (j <= s.heap_len) {\n    /* Set j to the smallest of the two sons: */\n    if (j < s.heap_len &&\n      smaller(tree, s.heap[j + 1], s.heap[j], s.depth)) {\n      j++;\n    }\n    /* Exit if v is smaller than both sons */\n    if (smaller(tree, v, s.heap[j], s.depth)) { break; }\n\n    /* Exchange v with the smallest son */\n    s.heap[k] = s.heap[j];\n    k = j;\n\n    /* And continue down the tree, setting j to the left son of k */\n    j <<= 1;\n  }\n  s.heap[k] = v;\n}\n\n\n// inlined manually\n// var SMALLEST = 1;\n\n/* ===========================================================================\n * Send the block data compressed using the given Huffman trees\n */\nfunction compress_block(s, ltree, dtree)\n//    deflate_state *s;\n//    const ct_data *ltree; /* literal tree */\n//    const ct_data *dtree; /* distance tree */\n{\n  var dist;           /* distance of matched string */\n  var lc;             /* match length or unmatched char (if dist == 0) */\n  var lx = 0;         /* running index in l_buf */\n  var code;           /* the code to send */\n  var extra;          /* number of extra bits to send */\n\n  if (s.last_lit !== 0) {\n    do {\n      dist = (s.pending_buf[s.d_buf + lx * 2] << 8) | (s.pending_buf[s.d_buf + lx * 2 + 1]);\n      lc = s.pending_buf[s.l_buf + lx];\n      lx++;\n\n      if (dist === 0) {\n        send_code(s, lc, ltree); /* send a literal byte */\n        //Tracecv(isgraph(lc), (stderr,\" '%c' \", lc));\n      } else {\n        /* Here, lc is the match length - MIN_MATCH */\n        code = _length_code[lc];\n        send_code(s, code + LITERALS + 1, ltree); /* send the length code */\n        extra = extra_lbits[code];\n        if (extra !== 0) {\n          lc -= base_length[code];\n          send_bits(s, lc, extra);       /* send the extra length bits */\n        }\n        dist--; /* dist is now the match distance - 1 */\n        code = d_code(dist);\n        //Assert (code < D_CODES, \"bad d_code\");\n\n        send_code(s, code, dtree);       /* send the distance code */\n        extra = extra_dbits[code];\n        if (extra !== 0) {\n          dist -= base_dist[code];\n          send_bits(s, dist, extra);   /* send the extra distance bits */\n        }\n      } /* literal or match pair ? */\n\n      /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */\n      //Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,\n      //       \"pendingBuf overflow\");\n\n    } while (lx < s.last_lit);\n  }\n\n  send_code(s, END_BLOCK, ltree);\n}\n\n\n/* ===========================================================================\n * Construct one Huffman tree and assigns the code bit strings and lengths.\n * Update the total bit length for the current block.\n * IN assertion: the field freq is set for all tree elements.\n * OUT assertions: the fields len and code are set to the optimal bit length\n *     and corresponding code. The length opt_len is updated; static_len is\n *     also updated if stree is not null. The field max_code is set.\n */\nfunction build_tree(s, desc)\n//    deflate_state *s;\n//    tree_desc *desc; /* the tree descriptor */\n{\n  var tree     = desc.dyn_tree;\n  var stree    = desc.stat_desc.static_tree;\n  var has_stree = desc.stat_desc.has_stree;\n  var elems    = desc.stat_desc.elems;\n  var n, m;          /* iterate over heap elements */\n  var max_code = -1; /* largest code with non zero frequency */\n  var node;          /* new node being created */\n\n  /* Construct the initial heap, with least frequent element in\n   * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].\n   * heap[0] is not used.\n   */\n  s.heap_len = 0;\n  s.heap_max = HEAP_SIZE;\n\n  for (n = 0; n < elems; n++) {\n    if (tree[n * 2]/*.Freq*/ !== 0) {\n      s.heap[++s.heap_len] = max_code = n;\n      s.depth[n] = 0;\n\n    } else {\n      tree[n * 2 + 1]/*.Len*/ = 0;\n    }\n  }\n\n  /* The pkzip format requires that at least one distance code exists,\n   * and that at least one bit should be sent even if there is only one\n   * possible code. So to avoid special checks later on we force at least\n   * two codes of non zero frequency.\n   */\n  while (s.heap_len < 2) {\n    node = s.heap[++s.heap_len] = (max_code < 2 ? ++max_code : 0);\n    tree[node * 2]/*.Freq*/ = 1;\n    s.depth[node] = 0;\n    s.opt_len--;\n\n    if (has_stree) {\n      s.static_len -= stree[node * 2 + 1]/*.Len*/;\n    }\n    /* node is 0 or 1 so it does not have extra bits */\n  }\n  desc.max_code = max_code;\n\n  /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,\n   * establish sub-heaps of increasing lengths:\n   */\n  for (n = (s.heap_len >> 1/*int /2*/); n >= 1; n--) { pqdownheap(s, tree, n); }\n\n  /* Construct the Huffman tree by repeatedly combining the least two\n   * frequent nodes.\n   */\n  node = elems;              /* next internal node of the tree */\n  do {\n    //pqremove(s, tree, n);  /* n = node of least frequency */\n    /*** pqremove ***/\n    n = s.heap[1/*SMALLEST*/];\n    s.heap[1/*SMALLEST*/] = s.heap[s.heap_len--];\n    pqdownheap(s, tree, 1/*SMALLEST*/);\n    /***/\n\n    m = s.heap[1/*SMALLEST*/]; /* m = node of next least frequency */\n\n    s.heap[--s.heap_max] = n; /* keep the nodes sorted by frequency */\n    s.heap[--s.heap_max] = m;\n\n    /* Create a new node father of n and m */\n    tree[node * 2]/*.Freq*/ = tree[n * 2]/*.Freq*/ + tree[m * 2]/*.Freq*/;\n    s.depth[node] = (s.depth[n] >= s.depth[m] ? s.depth[n] : s.depth[m]) + 1;\n    tree[n * 2 + 1]/*.Dad*/ = tree[m * 2 + 1]/*.Dad*/ = node;\n\n    /* and insert the new node in the heap */\n    s.heap[1/*SMALLEST*/] = node++;\n    pqdownheap(s, tree, 1/*SMALLEST*/);\n\n  } while (s.heap_len >= 2);\n\n  s.heap[--s.heap_max] = s.heap[1/*SMALLEST*/];\n\n  /* At this point, the fields freq and dad are set. We can now\n   * generate the bit lengths.\n   */\n  gen_bitlen(s, desc);\n\n  /* The field len is now set, we can generate the bit codes */\n  gen_codes(tree, max_code, s.bl_count);\n}\n\n\n/* ===========================================================================\n * Scan a literal or distance tree to determine the frequencies of the codes\n * in the bit length tree.\n */\nfunction scan_tree(s, tree, max_code)\n//    deflate_state *s;\n//    ct_data *tree;   /* the tree to be scanned */\n//    int max_code;    /* and its largest code of non zero frequency */\n{\n  var n;                     /* iterates over all tree elements */\n  var prevlen = -1;          /* last emitted length */\n  var curlen;                /* length of current code */\n\n  var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */\n\n  var count = 0;             /* repeat count of the current code */\n  var max_count = 7;         /* max repeat count */\n  var min_count = 4;         /* min repeat count */\n\n  if (nextlen === 0) {\n    max_count = 138;\n    min_count = 3;\n  }\n  tree[(max_code + 1) * 2 + 1]/*.Len*/ = 0xffff; /* guard */\n\n  for (n = 0; n <= max_code; n++) {\n    curlen = nextlen;\n    nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;\n\n    if (++count < max_count && curlen === nextlen) {\n      continue;\n\n    } else if (count < min_count) {\n      s.bl_tree[curlen * 2]/*.Freq*/ += count;\n\n    } else if (curlen !== 0) {\n\n      if (curlen !== prevlen) { s.bl_tree[curlen * 2]/*.Freq*/++; }\n      s.bl_tree[REP_3_6 * 2]/*.Freq*/++;\n\n    } else if (count <= 10) {\n      s.bl_tree[REPZ_3_10 * 2]/*.Freq*/++;\n\n    } else {\n      s.bl_tree[REPZ_11_138 * 2]/*.Freq*/++;\n    }\n\n    count = 0;\n    prevlen = curlen;\n\n    if (nextlen === 0) {\n      max_count = 138;\n      min_count = 3;\n\n    } else if (curlen === nextlen) {\n      max_count = 6;\n      min_count = 3;\n\n    } else {\n      max_count = 7;\n      min_count = 4;\n    }\n  }\n}\n\n\n/* ===========================================================================\n * Send a literal or distance tree in compressed form, using the codes in\n * bl_tree.\n */\nfunction send_tree(s, tree, max_code)\n//    deflate_state *s;\n//    ct_data *tree; /* the tree to be scanned */\n//    int max_code;       /* and its largest code of non zero frequency */\n{\n  var n;                     /* iterates over all tree elements */\n  var prevlen = -1;          /* last emitted length */\n  var curlen;                /* length of current code */\n\n  var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */\n\n  var count = 0;             /* repeat count of the current code */\n  var max_count = 7;         /* max repeat count */\n  var min_count = 4;         /* min repeat count */\n\n  /* tree[max_code+1].Len = -1; */  /* guard already set */\n  if (nextlen === 0) {\n    max_count = 138;\n    min_count = 3;\n  }\n\n  for (n = 0; n <= max_code; n++) {\n    curlen = nextlen;\n    nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;\n\n    if (++count < max_count && curlen === nextlen) {\n      continue;\n\n    } else if (count < min_count) {\n      do { send_code(s, curlen, s.bl_tree); } while (--count !== 0);\n\n    } else if (curlen !== 0) {\n      if (curlen !== prevlen) {\n        send_code(s, curlen, s.bl_tree);\n        count--;\n      }\n      //Assert(count >= 3 && count <= 6, \" 3_6?\");\n      send_code(s, REP_3_6, s.bl_tree);\n      send_bits(s, count - 3, 2);\n\n    } else if (count <= 10) {\n      send_code(s, REPZ_3_10, s.bl_tree);\n      send_bits(s, count - 3, 3);\n\n    } else {\n      send_code(s, REPZ_11_138, s.bl_tree);\n      send_bits(s, count - 11, 7);\n    }\n\n    count = 0;\n    prevlen = curlen;\n    if (nextlen === 0) {\n      max_count = 138;\n      min_count = 3;\n\n    } else if (curlen === nextlen) {\n      max_count = 6;\n      min_count = 3;\n\n    } else {\n      max_count = 7;\n      min_count = 4;\n    }\n  }\n}\n\n\n/* ===========================================================================\n * Construct the Huffman tree for the bit lengths and return the index in\n * bl_order of the last bit length code to send.\n */\nfunction build_bl_tree(s) {\n  var max_blindex;  /* index of last bit length code of non zero freq */\n\n  /* Determine the bit length frequencies for literal and distance trees */\n  scan_tree(s, s.dyn_ltree, s.l_desc.max_code);\n  scan_tree(s, s.dyn_dtree, s.d_desc.max_code);\n\n  /* Build the bit length tree: */\n  build_tree(s, s.bl_desc);\n  /* opt_len now includes the length of the tree representations, except\n   * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.\n   */\n\n  /* Determine the number of bit length codes to send. The pkzip format\n   * requires that at least 4 bit length codes be sent. (appnote.txt says\n   * 3 but the actual value used is 4.)\n   */\n  for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {\n    if (s.bl_tree[bl_order[max_blindex] * 2 + 1]/*.Len*/ !== 0) {\n      break;\n    }\n  }\n  /* Update opt_len to include the bit length tree and counts */\n  s.opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;\n  //Tracev((stderr, \"\\ndyn trees: dyn %ld, stat %ld\",\n  //        s->opt_len, s->static_len));\n\n  return max_blindex;\n}\n\n\n/* ===========================================================================\n * Send the header for a block using dynamic Huffman trees: the counts, the\n * lengths of the bit length codes, the literal tree and the distance tree.\n * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.\n */\nfunction send_all_trees(s, lcodes, dcodes, blcodes)\n//    deflate_state *s;\n//    int lcodes, dcodes, blcodes; /* number of codes for each tree */\n{\n  var rank;                    /* index in bl_order */\n\n  //Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, \"not enough codes\");\n  //Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,\n  //        \"too many codes\");\n  //Tracev((stderr, \"\\nbl counts: \"));\n  send_bits(s, lcodes - 257, 5); /* not +255 as stated in appnote.txt */\n  send_bits(s, dcodes - 1,   5);\n  send_bits(s, blcodes - 4,  4); /* not -3 as stated in appnote.txt */\n  for (rank = 0; rank < blcodes; rank++) {\n    //Tracev((stderr, \"\\nbl code %2d \", bl_order[rank]));\n    send_bits(s, s.bl_tree[bl_order[rank] * 2 + 1]/*.Len*/, 3);\n  }\n  //Tracev((stderr, \"\\nbl tree: sent %ld\", s->bits_sent));\n\n  send_tree(s, s.dyn_ltree, lcodes - 1); /* literal tree */\n  //Tracev((stderr, \"\\nlit tree: sent %ld\", s->bits_sent));\n\n  send_tree(s, s.dyn_dtree, dcodes - 1); /* distance tree */\n  //Tracev((stderr, \"\\ndist tree: sent %ld\", s->bits_sent));\n}\n\n\n/* ===========================================================================\n * Check if the data type is TEXT or BINARY, using the following algorithm:\n * - TEXT if the two conditions below are satisfied:\n *    a) There are no non-portable control characters belonging to the\n *       \"black list\" (0..6, 14..25, 28..31).\n *    b) There is at least one printable character belonging to the\n *       \"white list\" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).\n * - BINARY otherwise.\n * - The following partially-portable control characters form a\n *   \"gray list\" that is ignored in this detection algorithm:\n *   (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).\n * IN assertion: the fields Freq of dyn_ltree are set.\n */\nfunction detect_data_type(s) {\n  /* black_mask is the bit mask of black-listed bytes\n   * set bits 0..6, 14..25, and 28..31\n   * 0xf3ffc07f = binary 11110011111111111100000001111111\n   */\n  var black_mask = 0xf3ffc07f;\n  var n;\n\n  /* Check for non-textual (\"black-listed\") bytes. */\n  for (n = 0; n <= 31; n++, black_mask >>>= 1) {\n    if ((black_mask & 1) && (s.dyn_ltree[n * 2]/*.Freq*/ !== 0)) {\n      return Z_BINARY;\n    }\n  }\n\n  /* Check for textual (\"white-listed\") bytes. */\n  if (s.dyn_ltree[9 * 2]/*.Freq*/ !== 0 || s.dyn_ltree[10 * 2]/*.Freq*/ !== 0 ||\n      s.dyn_ltree[13 * 2]/*.Freq*/ !== 0) {\n    return Z_TEXT;\n  }\n  for (n = 32; n < LITERALS; n++) {\n    if (s.dyn_ltree[n * 2]/*.Freq*/ !== 0) {\n      return Z_TEXT;\n    }\n  }\n\n  /* There are no \"black-listed\" or \"white-listed\" bytes:\n   * this stream either is empty or has tolerated (\"gray-listed\") bytes only.\n   */\n  return Z_BINARY;\n}\n\n\nvar static_init_done = false;\n\n/* ===========================================================================\n * Initialize the tree data structures for a new zlib stream.\n */\nfunction _tr_init(s)\n{\n\n  if (!static_init_done) {\n    tr_static_init();\n    static_init_done = true;\n  }\n\n  s.l_desc  = new TreeDesc(s.dyn_ltree, static_l_desc);\n  s.d_desc  = new TreeDesc(s.dyn_dtree, static_d_desc);\n  s.bl_desc = new TreeDesc(s.bl_tree, static_bl_desc);\n\n  s.bi_buf = 0;\n  s.bi_valid = 0;\n\n  /* Initialize the first block of the first file: */\n  init_block(s);\n}\n\n\n/* ===========================================================================\n * Send a stored block\n */\nfunction _tr_stored_block(s, buf, stored_len, last)\n//DeflateState *s;\n//charf *buf;       /* input block */\n//ulg stored_len;   /* length of input block */\n//int last;         /* one if this is the last block for a file */\n{\n  send_bits(s, (STORED_BLOCK << 1) + (last ? 1 : 0), 3);    /* send block type */\n  copy_block(s, buf, stored_len, true); /* with header */\n}\n\n\n/* ===========================================================================\n * Send one empty static block to give enough lookahead for inflate.\n * This takes 10 bits, of which 7 may remain in the bit buffer.\n */\nfunction _tr_align(s) {\n  send_bits(s, STATIC_TREES << 1, 3);\n  send_code(s, END_BLOCK, static_ltree);\n  bi_flush(s);\n}\n\n\n/* ===========================================================================\n * Determine the best encoding for the current block: dynamic trees, static\n * trees or store, and output the encoded block to the zip file.\n */\nfunction _tr_flush_block(s, buf, stored_len, last)\n//DeflateState *s;\n//charf *buf;       /* input block, or NULL if too old */\n//ulg stored_len;   /* length of input block */\n//int last;         /* one if this is the last block for a file */\n{\n  var opt_lenb, static_lenb;  /* opt_len and static_len in bytes */\n  var max_blindex = 0;        /* index of last bit length code of non zero freq */\n\n  /* Build the Huffman trees unless a stored block is forced */\n  if (s.level > 0) {\n\n    /* Check if the file is binary or text */\n    if (s.strm.data_type === Z_UNKNOWN) {\n      s.strm.data_type = detect_data_type(s);\n    }\n\n    /* Construct the literal and distance trees */\n    build_tree(s, s.l_desc);\n    // Tracev((stderr, \"\\nlit data: dyn %ld, stat %ld\", s->opt_len,\n    //        s->static_len));\n\n    build_tree(s, s.d_desc);\n    // Tracev((stderr, \"\\ndist data: dyn %ld, stat %ld\", s->opt_len,\n    //        s->static_len));\n    /* At this point, opt_len and static_len are the total bit lengths of\n     * the compressed block data, excluding the tree representations.\n     */\n\n    /* Build the bit length tree for the above two trees, and get the index\n     * in bl_order of the last bit length code to send.\n     */\n    max_blindex = build_bl_tree(s);\n\n    /* Determine the best encoding. Compute the block lengths in bytes. */\n    opt_lenb = (s.opt_len + 3 + 7) >>> 3;\n    static_lenb = (s.static_len + 3 + 7) >>> 3;\n\n    // Tracev((stderr, \"\\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u \",\n    //        opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,\n    //        s->last_lit));\n\n    if (static_lenb <= opt_lenb) { opt_lenb = static_lenb; }\n\n  } else {\n    // Assert(buf != (char*)0, \"lost buf\");\n    opt_lenb = static_lenb = stored_len + 5; /* force a stored block */\n  }\n\n  if ((stored_len + 4 <= opt_lenb) && (buf !== -1)) {\n    /* 4: two words for the lengths */\n\n    /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.\n     * Otherwise we can't have processed more than WSIZE input bytes since\n     * the last block flush, because compression would have been\n     * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to\n     * transform a block into a stored block.\n     */\n    _tr_stored_block(s, buf, stored_len, last);\n\n  } else if (s.strategy === Z_FIXED || static_lenb === opt_lenb) {\n\n    send_bits(s, (STATIC_TREES << 1) + (last ? 1 : 0), 3);\n    compress_block(s, static_ltree, static_dtree);\n\n  } else {\n    send_bits(s, (DYN_TREES << 1) + (last ? 1 : 0), 3);\n    send_all_trees(s, s.l_desc.max_code + 1, s.d_desc.max_code + 1, max_blindex + 1);\n    compress_block(s, s.dyn_ltree, s.dyn_dtree);\n  }\n  // Assert (s->compressed_len == s->bits_sent, \"bad compressed size\");\n  /* The above check is made mod 2^32, for files larger than 512 MB\n   * and uLong implemented on 32 bits.\n   */\n  init_block(s);\n\n  if (last) {\n    bi_windup(s);\n  }\n  // Tracev((stderr,\"\\ncomprlen %lu(%lu) \", s->compressed_len>>3,\n  //       s->compressed_len-7*last));\n}\n\n/* ===========================================================================\n * Save the match info and tally the frequency counts. Return true if\n * the current block must be flushed.\n */\nfunction _tr_tally(s, dist, lc)\n//    deflate_state *s;\n//    unsigned dist;  /* distance of matched string */\n//    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */\n{\n  //var out_length, in_length, dcode;\n\n  s.pending_buf[s.d_buf + s.last_lit * 2]     = (dist >>> 8) & 0xff;\n  s.pending_buf[s.d_buf + s.last_lit * 2 + 1] = dist & 0xff;\n\n  s.pending_buf[s.l_buf + s.last_lit] = lc & 0xff;\n  s.last_lit++;\n\n  if (dist === 0) {\n    /* lc is the unmatched char */\n    s.dyn_ltree[lc * 2]/*.Freq*/++;\n  } else {\n    s.matches++;\n    /* Here, lc is the match length - MIN_MATCH */\n    dist--;             /* dist = match distance - 1 */\n    //Assert((ush)dist < (ush)MAX_DIST(s) &&\n    //       (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&\n    //       (ush)d_code(dist) < (ush)D_CODES,  \"_tr_tally: bad match\");\n\n    s.dyn_ltree[(_length_code[lc] + LITERALS + 1) * 2]/*.Freq*/++;\n    s.dyn_dtree[d_code(dist) * 2]/*.Freq*/++;\n  }\n\n// (!) This block is disabled in zlib defailts,\n// don't enable it for binary compatibility\n\n//#ifdef TRUNCATE_BLOCK\n//  /* Try to guess if it is profitable to stop the current block here */\n//  if ((s.last_lit & 0x1fff) === 0 && s.level > 2) {\n//    /* Compute an upper bound for the compressed length */\n//    out_length = s.last_lit*8;\n//    in_length = s.strstart - s.block_start;\n//\n//    for (dcode = 0; dcode < D_CODES; dcode++) {\n//      out_length += s.dyn_dtree[dcode*2]/*.Freq*/ * (5 + extra_dbits[dcode]);\n//    }\n//    out_length >>>= 3;\n//    //Tracev((stderr,\"\\nlast_lit %u, in %ld, out ~%ld(%ld%%) \",\n//    //       s->last_lit, in_length, out_length,\n//    //       100L - out_length*100L/in_length));\n//    if (s.matches < (s.last_lit>>1)/*int /2*/ && out_length < (in_length>>1)/*int /2*/) {\n//      return true;\n//    }\n//  }\n//#endif\n\n  return (s.last_lit === s.lit_bufsize - 1);\n  /* We avoid equality with lit_bufsize because of wraparound at 64K\n   * on 16 bit machines and because stored blocks are restricted to\n   * 64K-1 bytes.\n   */\n}\n\nexports._tr_init  = _tr_init;\nexports._tr_stored_block = _tr_stored_block;\nexports._tr_flush_block  = _tr_flush_block;\nexports._tr_tally = _tr_tally;\nexports._tr_align = _tr_align;\n",
     "'use strict';\n\n\nfunction ZStream() {\n  /* next input byte */\n  this.input = null; // JS specific, because we have no pointers\n  this.next_in = 0;\n  /* number of bytes available at input */\n  this.avail_in = 0;\n  /* total number of input bytes read so far */\n  this.total_in = 0;\n  /* next output byte should be put there */\n  this.output = null; // JS specific, because we have no pointers\n  this.next_out = 0;\n  /* remaining free space at output */\n  this.avail_out = 0;\n  /* total number of bytes output so far */\n  this.total_out = 0;\n  /* last error message, NULL if no error */\n  this.msg = ''/*Z_NULL*/;\n  /* not visible by applications */\n  this.state = null;\n  /* best guess about the data type: binary or text */\n  this.data_type = 2/*Z_UNKNOWN*/;\n  /* adler32 value of the uncompressed data */\n  this.adler = 0;\n}\n\nmodule.exports = ZStream;\n",
-    "// a duplex stream is just a stream that is both readable and writable.\n// Since JS doesn't have multiple prototypal inheritance, this class\n// prototypally inherits from Readable, and then parasitically from\n// Writable.\n\n'use strict';\n\n/*<replacement>*/\n\nvar objectKeys = Object.keys || function (obj) {\n  var keys = [];\n  for (var key in obj) {\n    keys.push(key);\n  }return keys;\n};\n/*</replacement>*/\n\nmodule.exports = Duplex;\n\n/*<replacement>*/\nvar processNextTick = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nvar Readable = require('./_stream_readable');\nvar Writable = require('./_stream_writable');\n\nutil.inherits(Duplex, Readable);\n\nvar keys = objectKeys(Writable.prototype);\nfor (var v = 0; v < keys.length; v++) {\n  var method = keys[v];\n  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];\n}\n\nfunction Duplex(options) {\n  if (!(this instanceof Duplex)) return new Duplex(options);\n\n  Readable.call(this, options);\n  Writable.call(this, options);\n\n  if (options && options.readable === false) this.readable = false;\n\n  if (options && options.writable === false) this.writable = false;\n\n  this.allowHalfOpen = true;\n  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;\n\n  this.once('end', onend);\n}\n\n// the no-half-open enforcer\nfunction onend() {\n  // if we allow half-open state, or if the writable side ended,\n  // then we're ok.\n  if (this.allowHalfOpen || this._writableState.ended) return;\n\n  // no more data can be written.\n  // But allow more writes to happen in this tick.\n  processNextTick(onEndNT, this);\n}\n\nfunction onEndNT(self) {\n  self.end();\n}\n\nfunction forEach(xs, f) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    f(xs[i], i);\n  }\n}",
-    "// a passthrough stream.\n// basically just the most minimal sort of Transform stream.\n// Every written chunk gets output as-is.\n\n'use strict';\n\nmodule.exports = PassThrough;\n\nvar Transform = require('./_stream_transform');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(PassThrough, Transform);\n\nfunction PassThrough(options) {\n  if (!(this instanceof PassThrough)) return new PassThrough(options);\n\n  Transform.call(this, options);\n}\n\nPassThrough.prototype._transform = function (chunk, encoding, cb) {\n  cb(null, chunk);\n};",
-    "'use strict';\n\nmodule.exports = Readable;\n\n/*<replacement>*/\nvar processNextTick = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar isArray = require('isarray');\n/*</replacement>*/\n\n/*<replacement>*/\nvar Buffer = require('buffer').Buffer;\n/*</replacement>*/\n\nReadable.ReadableState = ReadableState;\n\nvar EE = require('events');\n\n/*<replacement>*/\nvar EElistenerCount = function (emitter, type) {\n  return emitter.listeners(type).length;\n};\n/*</replacement>*/\n\n/*<replacement>*/\nvar Stream;\n(function () {\n  try {\n    Stream = require('st' + 'ream');\n  } catch (_) {} finally {\n    if (!Stream) Stream = require('events').EventEmitter;\n  }\n})();\n/*</replacement>*/\n\nvar Buffer = require('buffer').Buffer;\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\n/*<replacement>*/\nvar debugUtil = require('util');\nvar debug = undefined;\nif (debugUtil && debugUtil.debuglog) {\n  debug = debugUtil.debuglog('stream');\n} else {\n  debug = function () {};\n}\n/*</replacement>*/\n\nvar StringDecoder;\n\nutil.inherits(Readable, Stream);\n\nvar Duplex;\nfunction ReadableState(options, stream) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  options = options || {};\n\n  // object stream flag. Used to make read(n) ignore n and to\n  // make all the buffer merging and length checks go away\n  this.objectMode = !!options.objectMode;\n\n  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;\n\n  // the point at which it stops calling _read() to fill the buffer\n  // Note: 0 is a valid value, means \"don't call _read preemptively ever\"\n  var hwm = options.highWaterMark;\n  var defaultHwm = this.objectMode ? 16 : 16 * 1024;\n  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;\n\n  // cast to ints.\n  this.highWaterMark = ~ ~this.highWaterMark;\n\n  this.buffer = [];\n  this.length = 0;\n  this.pipes = null;\n  this.pipesCount = 0;\n  this.flowing = null;\n  this.ended = false;\n  this.endEmitted = false;\n  this.reading = false;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, because any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // whenever we return null, then we set a flag to say\n  // that we're awaiting a 'readable' event emission.\n  this.needReadable = false;\n  this.emittedReadable = false;\n  this.readableListening = false;\n  this.resumeScheduled = false;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // when piping, we only care about 'readable' events that happen\n  // after read()ing all the bytes and not getting any pushback.\n  this.ranOut = false;\n\n  // the number of writers that are awaiting a drain event in .pipe()s\n  this.awaitDrain = 0;\n\n  // if true, a maybeReadMore has been scheduled\n  this.readingMore = false;\n\n  this.decoder = null;\n  this.encoding = null;\n  if (options.encoding) {\n    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n    this.decoder = new StringDecoder(options.encoding);\n    this.encoding = options.encoding;\n  }\n}\n\nvar Duplex;\nfunction Readable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  if (!(this instanceof Readable)) return new Readable(options);\n\n  this._readableState = new ReadableState(options, this);\n\n  // legacy\n  this.readable = true;\n\n  if (options && typeof options.read === 'function') this._read = options.read;\n\n  Stream.call(this);\n}\n\n// Manually shove something into the read() buffer.\n// This returns true if the highWaterMark has not been hit yet,\n// similar to how Writable.write() returns true if you should\n// write() some more.\nReadable.prototype.push = function (chunk, encoding) {\n  var state = this._readableState;\n\n  if (!state.objectMode && typeof chunk === 'string') {\n    encoding = encoding || state.defaultEncoding;\n    if (encoding !== state.encoding) {\n      chunk = new Buffer(chunk, encoding);\n      encoding = '';\n    }\n  }\n\n  return readableAddChunk(this, state, chunk, encoding, false);\n};\n\n// Unshift should *always* be something directly out of read()\nReadable.prototype.unshift = function (chunk) {\n  var state = this._readableState;\n  return readableAddChunk(this, state, chunk, '', true);\n};\n\nReadable.prototype.isPaused = function () {\n  return this._readableState.flowing === false;\n};\n\nfunction readableAddChunk(stream, state, chunk, encoding, addToFront) {\n  var er = chunkInvalid(state, chunk);\n  if (er) {\n    stream.emit('error', er);\n  } else if (chunk === null) {\n    state.reading = false;\n    onEofChunk(stream, state);\n  } else if (state.objectMode || chunk && chunk.length > 0) {\n    if (state.ended && !addToFront) {\n      var e = new Error('stream.push() after EOF');\n      stream.emit('error', e);\n    } else if (state.endEmitted && addToFront) {\n      var e = new Error('stream.unshift() after end event');\n      stream.emit('error', e);\n    } else {\n      var skipAdd;\n      if (state.decoder && !addToFront && !encoding) {\n        chunk = state.decoder.write(chunk);\n        skipAdd = !state.objectMode && chunk.length === 0;\n      }\n\n      if (!addToFront) state.reading = false;\n\n      // Don't add to the buffer if we've decoded to an empty string chunk and\n      // we're not in object mode\n      if (!skipAdd) {\n        // if we want the data now, just emit it.\n        if (state.flowing && state.length === 0 && !state.sync) {\n          stream.emit('data', chunk);\n          stream.read(0);\n        } else {\n          // update the buffer info.\n          state.length += state.objectMode ? 1 : chunk.length;\n          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);\n\n          if (state.needReadable) emitReadable(stream);\n        }\n      }\n\n      maybeReadMore(stream, state);\n    }\n  } else if (!addToFront) {\n    state.reading = false;\n  }\n\n  return needMoreData(state);\n}\n\n// if it's past the high water mark, we can push in some more.\n// Also, if we have no data yet, we can stand some\n// more bytes.  This is to work around cases where hwm=0,\n// such as the repl.  Also, if the push() triggered a\n// readable event, and the user called read(largeNumber) such that\n// needReadable was set, then we ought to push more, so that another\n// 'readable' event will be triggered.\nfunction needMoreData(state) {\n  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);\n}\n\n// backwards compatibility.\nReadable.prototype.setEncoding = function (enc) {\n  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n  this._readableState.decoder = new StringDecoder(enc);\n  this._readableState.encoding = enc;\n  return this;\n};\n\n// Don't raise the hwm > 8MB\nvar MAX_HWM = 0x800000;\nfunction computeNewHighWaterMark(n) {\n  if (n >= MAX_HWM) {\n    n = MAX_HWM;\n  } else {\n    // Get the next highest power of 2\n    n--;\n    n |= n >>> 1;\n    n |= n >>> 2;\n    n |= n >>> 4;\n    n |= n >>> 8;\n    n |= n >>> 16;\n    n++;\n  }\n  return n;\n}\n\nfunction howMuchToRead(n, state) {\n  if (state.length === 0 && state.ended) return 0;\n\n  if (state.objectMode) return n === 0 ? 0 : 1;\n\n  if (n === null || isNaN(n)) {\n    // only flow one buffer at a time\n    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;\n  }\n\n  if (n <= 0) return 0;\n\n  // If we're asking for more than the target buffer level,\n  // then raise the water mark.  Bump up to the next highest\n  // power of 2, to prevent increasing it excessively in tiny\n  // amounts.\n  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);\n\n  // don't have that much.  return null, unless we've ended.\n  if (n > state.length) {\n    if (!state.ended) {\n      state.needReadable = true;\n      return 0;\n    } else {\n      return state.length;\n    }\n  }\n\n  return n;\n}\n\n// you can override either this method, or the async _read(n) below.\nReadable.prototype.read = function (n) {\n  debug('read', n);\n  var state = this._readableState;\n  var nOrig = n;\n\n  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;\n\n  // if we're doing read(0) to trigger a readable event, but we\n  // already have a bunch of data in the buffer, then just trigger\n  // the 'readable' event and move on.\n  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {\n    debug('read: emitReadable', state.length, state.ended);\n    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);\n    return null;\n  }\n\n  n = howMuchToRead(n, state);\n\n  // if we've ended, and we're now clear, then finish it up.\n  if (n === 0 && state.ended) {\n    if (state.length === 0) endReadable(this);\n    return null;\n  }\n\n  // All the actual chunk generation logic needs to be\n  // *below* the call to _read.  The reason is that in certain\n  // synthetic stream cases, such as passthrough streams, _read\n  // may be a completely synchronous operation which may change\n  // the state of the read buffer, providing enough data when\n  // before there was *not* enough.\n  //\n  // So, the steps are:\n  // 1. Figure out what the state of things will be after we do\n  // a read from the buffer.\n  //\n  // 2. If that resulting state will trigger a _read, then call _read.\n  // Note that this may be asynchronous, or synchronous.  Yes, it is\n  // deeply ugly to write APIs this way, but that still doesn't mean\n  // that the Readable class should behave improperly, as streams are\n  // designed to be sync/async agnostic.\n  // Take note if the _read call is sync or async (ie, if the read call\n  // has returned yet), so that we know whether or not it's safe to emit\n  // 'readable' etc.\n  //\n  // 3. Actually pull the requested chunks out of the buffer and return.\n\n  // if we need a readable event, then we need to do some reading.\n  var doRead = state.needReadable;\n  debug('need readable', doRead);\n\n  // if we currently have less than the highWaterMark, then also read some\n  if (state.length === 0 || state.length - n < state.highWaterMark) {\n    doRead = true;\n    debug('length less than watermark', doRead);\n  }\n\n  // however, if we've ended, then there's no point, and if we're already\n  // reading, then it's unnecessary.\n  if (state.ended || state.reading) {\n    doRead = false;\n    debug('reading or ended', doRead);\n  }\n\n  if (doRead) {\n    debug('do read');\n    state.reading = true;\n    state.sync = true;\n    // if the length is currently zero, then we *need* a readable event.\n    if (state.length === 0) state.needReadable = true;\n    // call internal read method\n    this._read(state.highWaterMark);\n    state.sync = false;\n  }\n\n  // If _read pushed data synchronously, then `reading` will be false,\n  // and we need to re-evaluate how much data we can return to the user.\n  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);\n\n  var ret;\n  if (n > 0) ret = fromList(n, state);else ret = null;\n\n  if (ret === null) {\n    state.needReadable = true;\n    n = 0;\n  }\n\n  state.length -= n;\n\n  // If we have nothing in the buffer, then we want to know\n  // as soon as we *do* get something into the buffer.\n  if (state.length === 0 && !state.ended) state.needReadable = true;\n\n  // If we tried to read() past the EOF, then emit end on the next tick.\n  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);\n\n  if (ret !== null) this.emit('data', ret);\n\n  return ret;\n};\n\nfunction chunkInvalid(state, chunk) {\n  var er = null;\n  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {\n    er = new TypeError('Invalid non-string/buffer chunk');\n  }\n  return er;\n}\n\nfunction onEofChunk(stream, state) {\n  if (state.ended) return;\n  if (state.decoder) {\n    var chunk = state.decoder.end();\n    if (chunk && chunk.length) {\n      state.buffer.push(chunk);\n      state.length += state.objectMode ? 1 : chunk.length;\n    }\n  }\n  state.ended = true;\n\n  // emit 'readable' now to make sure it gets picked up.\n  emitReadable(stream);\n}\n\n// Don't emit readable right away in sync mode, because this can trigger\n// another read() call => stack overflow.  This way, it might trigger\n// a nextTick recursion warning, but that's not so bad.\nfunction emitReadable(stream) {\n  var state = stream._readableState;\n  state.needReadable = false;\n  if (!state.emittedReadable) {\n    debug('emitReadable', state.flowing);\n    state.emittedReadable = true;\n    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);\n  }\n}\n\nfunction emitReadable_(stream) {\n  debug('emit readable');\n  stream.emit('readable');\n  flow(stream);\n}\n\n// at this point, the user has presumably seen the 'readable' event,\n// and called read() to consume some data.  that may have triggered\n// in turn another _read(n) call, in which case reading = true if\n// it's in progress.\n// However, if we're not ended, or reading, and the length < hwm,\n// then go ahead and try to read some more preemptively.\nfunction maybeReadMore(stream, state) {\n  if (!state.readingMore) {\n    state.readingMore = true;\n    processNextTick(maybeReadMore_, stream, state);\n  }\n}\n\nfunction maybeReadMore_(stream, state) {\n  var len = state.length;\n  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {\n    debug('maybeReadMore read 0');\n    stream.read(0);\n    if (len === state.length)\n      // didn't get any data, stop spinning.\n      break;else len = state.length;\n  }\n  state.readingMore = false;\n}\n\n// abstract method.  to be overridden in specific implementation classes.\n// call cb(er, data) where data is <= n in length.\n// for virtual (non-string, non-buffer) streams, \"length\" is somewhat\n// arbitrary, and perhaps not very meaningful.\nReadable.prototype._read = function (n) {\n  this.emit('error', new Error('not implemented'));\n};\n\nReadable.prototype.pipe = function (dest, pipeOpts) {\n  var src = this;\n  var state = this._readableState;\n\n  switch (state.pipesCount) {\n    case 0:\n      state.pipes = dest;\n      break;\n    case 1:\n      state.pipes = [state.pipes, dest];\n      break;\n    default:\n      state.pipes.push(dest);\n      break;\n  }\n  state.pipesCount += 1;\n  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);\n\n  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;\n\n  var endFn = doEnd ? onend : cleanup;\n  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);\n\n  dest.on('unpipe', onunpipe);\n  function onunpipe(readable) {\n    debug('onunpipe');\n    if (readable === src) {\n      cleanup();\n    }\n  }\n\n  function onend() {\n    debug('onend');\n    dest.end();\n  }\n\n  // when the dest drains, it reduces the awaitDrain counter\n  // on the source.  This would be more elegant with a .once()\n  // handler in flow(), but adding and removing repeatedly is\n  // too slow.\n  var ondrain = pipeOnDrain(src);\n  dest.on('drain', ondrain);\n\n  var cleanedUp = false;\n  function cleanup() {\n    debug('cleanup');\n    // cleanup event handlers once the pipe is broken\n    dest.removeListener('close', onclose);\n    dest.removeListener('finish', onfinish);\n    dest.removeListener('drain', ondrain);\n    dest.removeListener('error', onerror);\n    dest.removeListener('unpipe', onunpipe);\n    src.removeListener('end', onend);\n    src.removeListener('end', cleanup);\n    src.removeListener('data', ondata);\n\n    cleanedUp = true;\n\n    // if the reader is waiting for a drain event from this\n    // specific writer, then it would cause it to never start\n    // flowing again.\n    // So, if this is awaiting a drain, then we just call it now.\n    // If we don't know, then assume that we are waiting for one.\n    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();\n  }\n\n  src.on('data', ondata);\n  function ondata(chunk) {\n    debug('ondata');\n    var ret = dest.write(chunk);\n    if (false === ret) {\n      // If the user unpiped during `dest.write()`, it is possible\n      // to get stuck in a permanently paused state if that write\n      // also returned false.\n      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {\n        debug('false write response, pause', src._readableState.awaitDrain);\n        src._readableState.awaitDrain++;\n      }\n      src.pause();\n    }\n  }\n\n  // if the dest has an error, then stop piping into it.\n  // however, don't suppress the throwing behavior for this.\n  function onerror(er) {\n    debug('onerror', er);\n    unpipe();\n    dest.removeListener('error', onerror);\n    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);\n  }\n  // This is a brutally ugly hack to make sure that our error handler\n  // is attached before any userland ones.  NEVER DO THIS.\n  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];\n\n  // Both close and finish should trigger unpipe, but only once.\n  function onclose() {\n    dest.removeListener('finish', onfinish);\n    unpipe();\n  }\n  dest.once('close', onclose);\n  function onfinish() {\n    debug('onfinish');\n    dest.removeListener('close', onclose);\n    unpipe();\n  }\n  dest.once('finish', onfinish);\n\n  function unpipe() {\n    debug('unpipe');\n    src.unpipe(dest);\n  }\n\n  // tell the dest that it's being piped to\n  dest.emit('pipe', src);\n\n  // start the flow if it hasn't been started already.\n  if (!state.flowing) {\n    debug('pipe resume');\n    src.resume();\n  }\n\n  return dest;\n};\n\nfunction pipeOnDrain(src) {\n  return function () {\n    var state = src._readableState;\n    debug('pipeOnDrain', state.awaitDrain);\n    if (state.awaitDrain) state.awaitDrain--;\n    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {\n      state.flowing = true;\n      flow(src);\n    }\n  };\n}\n\nReadable.prototype.unpipe = function (dest) {\n  var state = this._readableState;\n\n  // if we're not piping anywhere, then do nothing.\n  if (state.pipesCount === 0) return this;\n\n  // just one destination.  most common case.\n  if (state.pipesCount === 1) {\n    // passed in one, but it's not the right one.\n    if (dest && dest !== state.pipes) return this;\n\n    if (!dest) dest = state.pipes;\n\n    // got a match.\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n    if (dest) dest.emit('unpipe', this);\n    return this;\n  }\n\n  // slow case. multiple pipe destinations.\n\n  if (!dest) {\n    // remove all.\n    var dests = state.pipes;\n    var len = state.pipesCount;\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n\n    for (var _i = 0; _i < len; _i++) {\n      dests[_i].emit('unpipe', this);\n    }return this;\n  }\n\n  // try to find the right one.\n  var i = indexOf(state.pipes, dest);\n  if (i === -1) return this;\n\n  state.pipes.splice(i, 1);\n  state.pipesCount -= 1;\n  if (state.pipesCount === 1) state.pipes = state.pipes[0];\n\n  dest.emit('unpipe', this);\n\n  return this;\n};\n\n// set up data events if they are asked for\n// Ensure readable listeners eventually get something\nReadable.prototype.on = function (ev, fn) {\n  var res = Stream.prototype.on.call(this, ev, fn);\n\n  // If listening to data, and it has not explicitly been paused,\n  // then call resume to start the flow of data on the next tick.\n  if (ev === 'data' && false !== this._readableState.flowing) {\n    this.resume();\n  }\n\n  if (ev === 'readable' && !this._readableState.endEmitted) {\n    var state = this._readableState;\n    if (!state.readableListening) {\n      state.readableListening = true;\n      state.emittedReadable = false;\n      state.needReadable = true;\n      if (!state.reading) {\n        processNextTick(nReadingNextTick, this);\n      } else if (state.length) {\n        emitReadable(this, state);\n      }\n    }\n  }\n\n  return res;\n};\nReadable.prototype.addListener = Readable.prototype.on;\n\nfunction nReadingNextTick(self) {\n  debug('readable nexttick read 0');\n  self.read(0);\n}\n\n// pause() and resume() are remnants of the legacy readable stream API\n// If the user uses them, then switch into old mode.\nReadable.prototype.resume = function () {\n  var state = this._readableState;\n  if (!state.flowing) {\n    debug('resume');\n    state.flowing = true;\n    resume(this, state);\n  }\n  return this;\n};\n\nfunction resume(stream, state) {\n  if (!state.resumeScheduled) {\n    state.resumeScheduled = true;\n    processNextTick(resume_, stream, state);\n  }\n}\n\nfunction resume_(stream, state) {\n  if (!state.reading) {\n    debug('resume read 0');\n    stream.read(0);\n  }\n\n  state.resumeScheduled = false;\n  stream.emit('resume');\n  flow(stream);\n  if (state.flowing && !state.reading) stream.read(0);\n}\n\nReadable.prototype.pause = function () {\n  debug('call pause flowing=%j', this._readableState.flowing);\n  if (false !== this._readableState.flowing) {\n    debug('pause');\n    this._readableState.flowing = false;\n    this.emit('pause');\n  }\n  return this;\n};\n\nfunction flow(stream) {\n  var state = stream._readableState;\n  debug('flow', state.flowing);\n  if (state.flowing) {\n    do {\n      var chunk = stream.read();\n    } while (null !== chunk && state.flowing);\n  }\n}\n\n// wrap an old-style stream as the async data source.\n// This is *not* part of the readable stream interface.\n// It is an ugly unfortunate mess of history.\nReadable.prototype.wrap = function (stream) {\n  var state = this._readableState;\n  var paused = false;\n\n  var self = this;\n  stream.on('end', function () {\n    debug('wrapped end');\n    if (state.decoder && !state.ended) {\n      var chunk = state.decoder.end();\n      if (chunk && chunk.length) self.push(chunk);\n    }\n\n    self.push(null);\n  });\n\n  stream.on('data', function (chunk) {\n    debug('wrapped data');\n    if (state.decoder) chunk = state.decoder.write(chunk);\n\n    // don't skip over falsy values in objectMode\n    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;\n\n    var ret = self.push(chunk);\n    if (!ret) {\n      paused = true;\n      stream.pause();\n    }\n  });\n\n  // proxy all the other methods.\n  // important when wrapping filters and duplexes.\n  for (var i in stream) {\n    if (this[i] === undefined && typeof stream[i] === 'function') {\n      this[i] = function (method) {\n        return function () {\n          return stream[method].apply(stream, arguments);\n        };\n      }(i);\n    }\n  }\n\n  // proxy certain important events.\n  var events = ['error', 'close', 'destroy', 'pause', 'resume'];\n  forEach(events, function (ev) {\n    stream.on(ev, self.emit.bind(self, ev));\n  });\n\n  // when we try to consume some more bytes, simply unpause the\n  // underlying stream.\n  self._read = function (n) {\n    debug('wrapped _read', n);\n    if (paused) {\n      paused = false;\n      stream.resume();\n    }\n  };\n\n  return self;\n};\n\n// exposed for testing purposes only.\nReadable._fromList = fromList;\n\n// Pluck off n bytes from an array of buffers.\n// Length is the combined lengths of all the buffers in the list.\nfunction fromList(n, state) {\n  var list = state.buffer;\n  var length = state.length;\n  var stringMode = !!state.decoder;\n  var objectMode = !!state.objectMode;\n  var ret;\n\n  // nothing in the list, definitely empty.\n  if (list.length === 0) return null;\n\n  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {\n    // read it all, truncate the array.\n    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);\n    list.length = 0;\n  } else {\n    // read just some of it.\n    if (n < list[0].length) {\n      // just take a part of the first list item.\n      // slice is the same for buffers and strings.\n      var buf = list[0];\n      ret = buf.slice(0, n);\n      list[0] = buf.slice(n);\n    } else if (n === list[0].length) {\n      // first list is a perfect match\n      ret = list.shift();\n    } else {\n      // complex case.\n      // we have enough to cover it, but it spans past the first buffer.\n      if (stringMode) ret = '';else ret = new Buffer(n);\n\n      var c = 0;\n      for (var i = 0, l = list.length; i < l && c < n; i++) {\n        var buf = list[0];\n        var cpy = Math.min(n - c, buf.length);\n\n        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);\n\n        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();\n\n        c += cpy;\n      }\n    }\n  }\n\n  return ret;\n}\n\nfunction endReadable(stream) {\n  var state = stream._readableState;\n\n  // If we get here before consuming all the bytes, then that is a\n  // bug in node.  Should never happen.\n  if (state.length > 0) throw new Error('endReadable called on non-empty stream');\n\n  if (!state.endEmitted) {\n    state.ended = true;\n    processNextTick(endReadableNT, state, stream);\n  }\n}\n\nfunction endReadableNT(state, stream) {\n  // Check that we didn't get one last unshift.\n  if (!state.endEmitted && state.length === 0) {\n    state.endEmitted = true;\n    stream.readable = false;\n    stream.emit('end');\n  }\n}\n\nfunction forEach(xs, f) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    f(xs[i], i);\n  }\n}\n\nfunction indexOf(xs, x) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    if (xs[i] === x) return i;\n  }\n  return -1;\n}",
-    "// a transform stream is a readable/writable stream where you do\n// something with the data.  Sometimes it's called a \"filter\",\n// but that's not a great name for it, since that implies a thing where\n// some bits pass through, and others are simply ignored.  (That would\n// be a valid example of a transform, of course.)\n//\n// While the output is causally related to the input, it's not a\n// necessarily symmetric or synchronous transformation.  For example,\n// a zlib stream might take multiple plain-text writes(), and then\n// emit a single compressed chunk some time in the future.\n//\n// Here's how this works:\n//\n// The Transform stream has all the aspects of the readable and writable\n// stream classes.  When you write(chunk), that calls _write(chunk,cb)\n// internally, and returns false if there's a lot of pending writes\n// buffered up.  When you call read(), that calls _read(n) until\n// there's enough pending readable data buffered up.\n//\n// In a transform stream, the written data is placed in a buffer.  When\n// _read(n) is called, it transforms the queued up data, calling the\n// buffered _write cb's as it consumes chunks.  If consuming a single\n// written chunk would result in multiple output chunks, then the first\n// outputted bit calls the readcb, and subsequent chunks just go into\n// the read buffer, and will cause it to emit 'readable' if necessary.\n//\n// This way, back-pressure is actually determined by the reading side,\n// since _read has to be called to start processing a new chunk.  However,\n// a pathological inflate type of transform can cause excessive buffering\n// here.  For example, imagine a stream where every byte of input is\n// interpreted as an integer from 0-255, and then results in that many\n// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in\n// 1kb of data being output.  In this case, you could write a very small\n// amount of input, and end up with a very large amount of output.  In\n// such a pathological inflating mechanism, there'd be no way to tell\n// the system to stop doing the transform.  A single 4MB write could\n// cause the system to run out of memory.\n//\n// However, even in such a pathological case, only a single written chunk\n// would be consumed, and then the rest would wait (un-transformed) until\n// the results of the previous transformed chunk were consumed.\n\n'use strict';\n\nmodule.exports = Transform;\n\nvar Duplex = require('./_stream_duplex');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(Transform, Duplex);\n\nfunction TransformState(stream) {\n  this.afterTransform = function (er, data) {\n    return afterTransform(stream, er, data);\n  };\n\n  this.needTransform = false;\n  this.transforming = false;\n  this.writecb = null;\n  this.writechunk = null;\n  this.writeencoding = null;\n}\n\nfunction afterTransform(stream, er, data) {\n  var ts = stream._transformState;\n  ts.transforming = false;\n\n  var cb = ts.writecb;\n\n  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));\n\n  ts.writechunk = null;\n  ts.writecb = null;\n\n  if (data !== null && data !== undefined) stream.push(data);\n\n  cb(er);\n\n  var rs = stream._readableState;\n  rs.reading = false;\n  if (rs.needReadable || rs.length < rs.highWaterMark) {\n    stream._read(rs.highWaterMark);\n  }\n}\n\nfunction Transform(options) {\n  if (!(this instanceof Transform)) return new Transform(options);\n\n  Duplex.call(this, options);\n\n  this._transformState = new TransformState(this);\n\n  // when the writable side finishes, then flush out anything remaining.\n  var stream = this;\n\n  // start out asking for a readable event once data is transformed.\n  this._readableState.needReadable = true;\n\n  // we have implemented the _read method, and done the other things\n  // that Readable wants before the first _read call, so unset the\n  // sync guard flag.\n  this._readableState.sync = false;\n\n  if (options) {\n    if (typeof options.transform === 'function') this._transform = options.transform;\n\n    if (typeof options.flush === 'function') this._flush = options.flush;\n  }\n\n  this.once('prefinish', function () {\n    if (typeof this._flush === 'function') this._flush(function (er) {\n      done(stream, er);\n    });else done(stream);\n  });\n}\n\nTransform.prototype.push = function (chunk, encoding) {\n  this._transformState.needTransform = false;\n  return Duplex.prototype.push.call(this, chunk, encoding);\n};\n\n// This is the part where you do stuff!\n// override this function in implementation classes.\n// 'chunk' is an input chunk.\n//\n// Call `push(newChunk)` to pass along transformed output\n// to the readable side.  You may call 'push' zero or more times.\n//\n// Call `cb(err)` when you are done with this chunk.  If you pass\n// an error, then that'll put the hurt on the whole operation.  If you\n// never call cb(), then you'll never get another chunk.\nTransform.prototype._transform = function (chunk, encoding, cb) {\n  throw new Error('not implemented');\n};\n\nTransform.prototype._write = function (chunk, encoding, cb) {\n  var ts = this._transformState;\n  ts.writecb = cb;\n  ts.writechunk = chunk;\n  ts.writeencoding = encoding;\n  if (!ts.transforming) {\n    var rs = this._readableState;\n    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);\n  }\n};\n\n// Doesn't matter what the args are here.\n// _transform does all the work.\n// That we got here means that the readable side wants more data.\nTransform.prototype._read = function (n) {\n  var ts = this._transformState;\n\n  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {\n    ts.transforming = true;\n    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);\n  } else {\n    // mark that we need a transform, so that any data that comes in\n    // will get processed, now that we've asked for it.\n    ts.needTransform = true;\n  }\n};\n\nfunction done(stream, er) {\n  if (er) return stream.emit('error', er);\n\n  // if there's nothing in the write buffer, then that means\n  // that nothing more will ever be provided\n  var ws = stream._writableState;\n  var ts = stream._transformState;\n\n  if (ws.length) throw new Error('calling transform done when ws.length != 0');\n\n  if (ts.transforming) throw new Error('calling transform done when still transforming');\n\n  return stream.push(null);\n}",
-    "// A bit simpler than readable streams.\n// Implement an async ._write(chunk, encoding, cb), and it'll handle all\n// the drain event emission and buffering.\n\n'use strict';\n\nmodule.exports = Writable;\n\n/*<replacement>*/\nvar processNextTick = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;\n/*</replacement>*/\n\n/*<replacement>*/\nvar Buffer = require('buffer').Buffer;\n/*</replacement>*/\n\nWritable.WritableState = WritableState;\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\n/*<replacement>*/\nvar internalUtil = {\n  deprecate: require('util-deprecate')\n};\n/*</replacement>*/\n\n/*<replacement>*/\nvar Stream;\n(function () {\n  try {\n    Stream = require('st' + 'ream');\n  } catch (_) {} finally {\n    if (!Stream) Stream = require('events').EventEmitter;\n  }\n})();\n/*</replacement>*/\n\nvar Buffer = require('buffer').Buffer;\n\nutil.inherits(Writable, Stream);\n\nfunction nop() {}\n\nfunction WriteReq(chunk, encoding, cb) {\n  this.chunk = chunk;\n  this.encoding = encoding;\n  this.callback = cb;\n  this.next = null;\n}\n\nvar Duplex;\nfunction WritableState(options, stream) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  options = options || {};\n\n  // object stream flag to indicate whether or not this stream\n  // contains buffers or objects.\n  this.objectMode = !!options.objectMode;\n\n  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;\n\n  // the point at which write() starts returning false\n  // Note: 0 is a valid value, means that we always return false if\n  // the entire buffer is not flushed immediately on write()\n  var hwm = options.highWaterMark;\n  var defaultHwm = this.objectMode ? 16 : 16 * 1024;\n  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;\n\n  // cast to ints.\n  this.highWaterMark = ~ ~this.highWaterMark;\n\n  this.needDrain = false;\n  // at the start of calling end()\n  this.ending = false;\n  // when end() has been called, and returned\n  this.ended = false;\n  // when 'finish' is emitted\n  this.finished = false;\n\n  // should we decode strings into buffers before passing to _write?\n  // this is here so that some node-core streams can optimize string\n  // handling at a lower level.\n  var noDecode = options.decodeStrings === false;\n  this.decodeStrings = !noDecode;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // not an actual buffer we keep track of, but a measurement\n  // of how much we're waiting to get pushed to some underlying\n  // socket or file.\n  this.length = 0;\n\n  // a flag to see when we're in the middle of a write.\n  this.writing = false;\n\n  // when true all writes will be buffered until .uncork() call\n  this.corked = 0;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, because any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // a flag to know if we're processing previously buffered items, which\n  // may call the _write() callback in the same tick, so that we don't\n  // end up in an overlapped onwrite situation.\n  this.bufferProcessing = false;\n\n  // the callback that's passed to _write(chunk,cb)\n  this.onwrite = function (er) {\n    onwrite(stream, er);\n  };\n\n  // the callback that the user supplies to write(chunk,encoding,cb)\n  this.writecb = null;\n\n  // the amount that is being written when _write is called.\n  this.writelen = 0;\n\n  this.bufferedRequest = null;\n  this.lastBufferedRequest = null;\n\n  // number of pending user-supplied write callbacks\n  // this must be 0 before 'finish' can be emitted\n  this.pendingcb = 0;\n\n  // emit prefinish if the only thing we're waiting for is _write cbs\n  // This is relevant for synchronous Transform streams\n  this.prefinished = false;\n\n  // True if the error was already emitted and should not be thrown again\n  this.errorEmitted = false;\n\n  // count buffered requests\n  this.bufferedRequestCount = 0;\n\n  // create the two objects needed to store the corked requests\n  // they are not a linked list, as no new elements are inserted in there\n  this.corkedRequestsFree = new CorkedRequest(this);\n  this.corkedRequestsFree.next = new CorkedRequest(this);\n}\n\nWritableState.prototype.getBuffer = function writableStateGetBuffer() {\n  var current = this.bufferedRequest;\n  var out = [];\n  while (current) {\n    out.push(current);\n    current = current.next;\n  }\n  return out;\n};\n\n(function () {\n  try {\n    Object.defineProperty(WritableState.prototype, 'buffer', {\n      get: internalUtil.deprecate(function () {\n        return this.getBuffer();\n      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')\n    });\n  } catch (_) {}\n})();\n\nvar Duplex;\nfunction Writable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  // Writable ctor is applied to Duplexes, though they're not\n  // instanceof Writable, they're instanceof Readable.\n  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);\n\n  this._writableState = new WritableState(options, this);\n\n  // legacy.\n  this.writable = true;\n\n  if (options) {\n    if (typeof options.write === 'function') this._write = options.write;\n\n    if (typeof options.writev === 'function') this._writev = options.writev;\n  }\n\n  Stream.call(this);\n}\n\n// Otherwise people can pipe Writable streams, which is just wrong.\nWritable.prototype.pipe = function () {\n  this.emit('error', new Error('Cannot pipe. Not readable.'));\n};\n\nfunction writeAfterEnd(stream, cb) {\n  var er = new Error('write after end');\n  // TODO: defer error events consistently everywhere, not just the cb\n  stream.emit('error', er);\n  processNextTick(cb, er);\n}\n\n// If we get something that is not a buffer, string, null, or undefined,\n// and we're not in objectMode, then that's an error.\n// Otherwise stream chunks are all considered to be of length=1, and the\n// watermarks determine how many objects to keep in the buffer, rather than\n// how many bytes or characters.\nfunction validChunk(stream, state, chunk, cb) {\n  var valid = true;\n\n  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {\n    var er = new TypeError('Invalid non-string/buffer chunk');\n    stream.emit('error', er);\n    processNextTick(cb, er);\n    valid = false;\n  }\n  return valid;\n}\n\nWritable.prototype.write = function (chunk, encoding, cb) {\n  var state = this._writableState;\n  var ret = false;\n\n  if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;\n\n  if (typeof cb !== 'function') cb = nop;\n\n  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {\n    state.pendingcb++;\n    ret = writeOrBuffer(this, state, chunk, encoding, cb);\n  }\n\n  return ret;\n};\n\nWritable.prototype.cork = function () {\n  var state = this._writableState;\n\n  state.corked++;\n};\n\nWritable.prototype.uncork = function () {\n  var state = this._writableState;\n\n  if (state.corked) {\n    state.corked--;\n\n    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);\n  }\n};\n\nWritable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {\n  // node::ParseEncoding() requires lower case.\n  if (typeof encoding === 'string') encoding = encoding.toLowerCase();\n  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);\n  this._writableState.defaultEncoding = encoding;\n};\n\nfunction decodeChunk(state, chunk, encoding) {\n  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {\n    chunk = new Buffer(chunk, encoding);\n  }\n  return chunk;\n}\n\n// if we're already writing something, then just put this\n// in the queue, and wait our turn.  Otherwise, call _write\n// If we return false, then we need a drain event, so set that flag.\nfunction writeOrBuffer(stream, state, chunk, encoding, cb) {\n  chunk = decodeChunk(state, chunk, encoding);\n\n  if (Buffer.isBuffer(chunk)) encoding = 'buffer';\n  var len = state.objectMode ? 1 : chunk.length;\n\n  state.length += len;\n\n  var ret = state.length < state.highWaterMark;\n  // we must ensure that previous needDrain will not be reset to false.\n  if (!ret) state.needDrain = true;\n\n  if (state.writing || state.corked) {\n    var last = state.lastBufferedRequest;\n    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);\n    if (last) {\n      last.next = state.lastBufferedRequest;\n    } else {\n      state.bufferedRequest = state.lastBufferedRequest;\n    }\n    state.bufferedRequestCount += 1;\n  } else {\n    doWrite(stream, state, false, len, chunk, encoding, cb);\n  }\n\n  return ret;\n}\n\nfunction doWrite(stream, state, writev, len, chunk, encoding, cb) {\n  state.writelen = len;\n  state.writecb = cb;\n  state.writing = true;\n  state.sync = true;\n  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);\n  state.sync = false;\n}\n\nfunction onwriteError(stream, state, sync, er, cb) {\n  --state.pendingcb;\n  if (sync) processNextTick(cb, er);else cb(er);\n\n  stream._writableState.errorEmitted = true;\n  stream.emit('error', er);\n}\n\nfunction onwriteStateUpdate(state) {\n  state.writing = false;\n  state.writecb = null;\n  state.length -= state.writelen;\n  state.writelen = 0;\n}\n\nfunction onwrite(stream, er) {\n  var state = stream._writableState;\n  var sync = state.sync;\n  var cb = state.writecb;\n\n  onwriteStateUpdate(state);\n\n  if (er) onwriteError(stream, state, sync, er, cb);else {\n    // Check if we're actually ready to finish, but don't emit yet\n    var finished = needFinish(state);\n\n    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {\n      clearBuffer(stream, state);\n    }\n\n    if (sync) {\n      /*<replacement>*/\n      asyncWrite(afterWrite, stream, state, finished, cb);\n      /*</replacement>*/\n    } else {\n        afterWrite(stream, state, finished, cb);\n      }\n  }\n}\n\nfunction afterWrite(stream, state, finished, cb) {\n  if (!finished) onwriteDrain(stream, state);\n  state.pendingcb--;\n  cb();\n  finishMaybe(stream, state);\n}\n\n// Must force callback to be called on nextTick, so that we don't\n// emit 'drain' before the write() consumer gets the 'false' return\n// value, and has a chance to attach a 'drain' listener.\nfunction onwriteDrain(stream, state) {\n  if (state.length === 0 && state.needDrain) {\n    state.needDrain = false;\n    stream.emit('drain');\n  }\n}\n\n// if there's something in the buffer waiting, then process it\nfunction clearBuffer(stream, state) {\n  state.bufferProcessing = true;\n  var entry = state.bufferedRequest;\n\n  if (stream._writev && entry && entry.next) {\n    // Fast case, write everything using _writev()\n    var l = state.bufferedRequestCount;\n    var buffer = new Array(l);\n    var holder = state.corkedRequestsFree;\n    holder.entry = entry;\n\n    var count = 0;\n    while (entry) {\n      buffer[count] = entry;\n      entry = entry.next;\n      count += 1;\n    }\n\n    doWrite(stream, state, true, state.length, buffer, '', holder.finish);\n\n    // doWrite is always async, defer these to save a bit of time\n    // as the hot path ends with doWrite\n    state.pendingcb++;\n    state.lastBufferedRequest = null;\n    state.corkedRequestsFree = holder.next;\n    holder.next = null;\n  } else {\n    // Slow case, write chunks one-by-one\n    while (entry) {\n      var chunk = entry.chunk;\n      var encoding = entry.encoding;\n      var cb = entry.callback;\n      var len = state.objectMode ? 1 : chunk.length;\n\n      doWrite(stream, state, false, len, chunk, encoding, cb);\n      entry = entry.next;\n      // if we didn't call the onwrite immediately, then\n      // it means that we need to wait until it does.\n      // also, that means that the chunk and cb are currently\n      // being processed, so move the buffer counter past them.\n      if (state.writing) {\n        break;\n      }\n    }\n\n    if (entry === null) state.lastBufferedRequest = null;\n  }\n\n  state.bufferedRequestCount = 0;\n  state.bufferedRequest = entry;\n  state.bufferProcessing = false;\n}\n\nWritable.prototype._write = function (chunk, encoding, cb) {\n  cb(new Error('not implemented'));\n};\n\nWritable.prototype._writev = null;\n\nWritable.prototype.end = function (chunk, encoding, cb) {\n  var state = this._writableState;\n\n  if (typeof chunk === 'function') {\n    cb = chunk;\n    chunk = null;\n    encoding = null;\n  } else if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);\n\n  // .end() fully uncorks\n  if (state.corked) {\n    state.corked = 1;\n    this.uncork();\n  }\n\n  // ignore unnecessary end() calls.\n  if (!state.ending && !state.finished) endWritable(this, state, cb);\n};\n\nfunction needFinish(state) {\n  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;\n}\n\nfunction prefinish(stream, state) {\n  if (!state.prefinished) {\n    state.prefinished = true;\n    stream.emit('prefinish');\n  }\n}\n\nfunction finishMaybe(stream, state) {\n  var need = needFinish(state);\n  if (need) {\n    if (state.pendingcb === 0) {\n      prefinish(stream, state);\n      state.finished = true;\n      stream.emit('finish');\n    } else {\n      prefinish(stream, state);\n    }\n  }\n  return need;\n}\n\nfunction endWritable(stream, state, cb) {\n  state.ending = true;\n  finishMaybe(stream, state);\n  if (cb) {\n    if (state.finished) processNextTick(cb);else stream.once('finish', cb);\n  }\n  state.ended = true;\n  stream.writable = false;\n}\n\n// It seems a linked list but it is not\n// there will be only 2 of these for each stream\nfunction CorkedRequest(state) {\n  var _this = this;\n\n  this.next = null;\n  this.entry = null;\n\n  this.finish = function (err) {\n    var entry = _this.entry;\n    _this.entry = null;\n    while (entry) {\n      var cb = entry.callback;\n      state.pendingcb--;\n      cb(err);\n      entry = entry.next;\n    }\n    if (state.corkedRequestsFree) {\n      state.corkedRequestsFree.next = _this;\n    } else {\n      state.corkedRequestsFree = _this;\n    }\n  };\n}",
-    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// NOTE: These type checking functions intentionally don't use `instanceof`\n// because it is fragile and can be easily faked with `Object.create()`.\n\nfunction isArray(arg) {\n  if (Array.isArray) {\n    return Array.isArray(arg);\n  }\n  return objectToString(arg) === '[object Array]';\n}\nexports.isArray = isArray;\n\nfunction isBoolean(arg) {\n  return typeof arg === 'boolean';\n}\nexports.isBoolean = isBoolean;\n\nfunction isNull(arg) {\n  return arg === null;\n}\nexports.isNull = isNull;\n\nfunction isNullOrUndefined(arg) {\n  return arg == null;\n}\nexports.isNullOrUndefined = isNullOrUndefined;\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\nexports.isNumber = isNumber;\n\nfunction isString(arg) {\n  return typeof arg === 'string';\n}\nexports.isString = isString;\n\nfunction isSymbol(arg) {\n  return typeof arg === 'symbol';\n}\nexports.isSymbol = isSymbol;\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\nexports.isUndefined = isUndefined;\n\nfunction isRegExp(re) {\n  return objectToString(re) === '[object RegExp]';\n}\nexports.isRegExp = isRegExp;\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\nexports.isObject = isObject;\n\nfunction isDate(d) {\n  return objectToString(d) === '[object Date]';\n}\nexports.isDate = isDate;\n\nfunction isError(e) {\n  return (objectToString(e) === '[object Error]' || e instanceof Error);\n}\nexports.isError = isError;\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\nexports.isFunction = isFunction;\n\nfunction isPrimitive(arg) {\n  return arg === null ||\n         typeof arg === 'boolean' ||\n         typeof arg === 'number' ||\n         typeof arg === 'string' ||\n         typeof arg === 'symbol' ||  // ES6 symbol\n         typeof arg === 'undefined';\n}\nexports.isPrimitive = isPrimitive;\n\nexports.isBuffer = Buffer.isBuffer;\n\nfunction objectToString(o) {\n  return Object.prototype.toString.call(o);\n}\n",
-    "'use strict';\n\nif (!process.version ||\n    process.version.indexOf('v0.') === 0 ||\n    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {\n  module.exports = nextTick;\n} else {\n  module.exports = process.nextTick;\n}\n\nfunction nextTick(fn, arg1, arg2, arg3) {\n  if (typeof fn !== 'function') {\n    throw new TypeError('\"callback\" argument must be a function');\n  }\n  var len = arguments.length;\n  var args, i;\n  switch (len) {\n  case 0:\n  case 1:\n    return process.nextTick(fn);\n  case 2:\n    return process.nextTick(function afterTickOne() {\n      fn.call(null, arg1);\n    });\n  case 3:\n    return process.nextTick(function afterTickTwo() {\n      fn.call(null, arg1, arg2);\n    });\n  case 4:\n    return process.nextTick(function afterTickThree() {\n      fn.call(null, arg1, arg2, arg3);\n    });\n  default:\n    args = new Array(len - 1);\n    i = 0;\n    while (i < args.length) {\n      args[i++] = arguments[i];\n    }\n    return process.nextTick(function afterTick() {\n      fn.apply(null, args);\n    });\n  }\n}\n",
-    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar Buffer = require('buffer').Buffer;\n\nvar isBufferEncoding = Buffer.isEncoding\n  || function(encoding) {\n       switch (encoding && encoding.toLowerCase()) {\n         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;\n         default: return false;\n       }\n     }\n\n\nfunction assertEncoding(encoding) {\n  if (encoding && !isBufferEncoding(encoding)) {\n    throw new Error('Unknown encoding: ' + encoding);\n  }\n}\n\n// StringDecoder provides an interface for efficiently splitting a series of\n// buffers into a series of JS strings without breaking apart multi-byte\n// characters. CESU-8 is handled as part of the UTF-8 encoding.\n//\n// @TODO Handling all encodings inside a single object makes it very difficult\n// to reason about this code, so it should be split up in the future.\n// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code\n// points as used by CESU-8.\nvar StringDecoder = exports.StringDecoder = function(encoding) {\n  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');\n  assertEncoding(encoding);\n  switch (this.encoding) {\n    case 'utf8':\n      // CESU-8 represents each of Surrogate Pair by 3-bytes\n      this.surrogateSize = 3;\n      break;\n    case 'ucs2':\n    case 'utf16le':\n      // UTF-16 represents each of Surrogate Pair by 2-bytes\n      this.surrogateSize = 2;\n      this.detectIncompleteChar = utf16DetectIncompleteChar;\n      break;\n    case 'base64':\n      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.\n      this.surrogateSize = 3;\n      this.detectIncompleteChar = base64DetectIncompleteChar;\n      break;\n    default:\n      this.write = passThroughWrite;\n      return;\n  }\n\n  // Enough space to store all bytes of a single character. UTF-8 needs 4\n  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).\n  this.charBuffer = new Buffer(6);\n  // Number of bytes received for the current incomplete multi-byte character.\n  this.charReceived = 0;\n  // Number of bytes expected for the current incomplete multi-byte character.\n  this.charLength = 0;\n};\n\n\n// write decodes the given buffer and returns it as JS string that is\n// guaranteed to not contain any partial multi-byte characters. Any partial\n// character found at the end of the buffer is buffered up, and will be\n// returned when calling write again with the remaining bytes.\n//\n// Note: Converting a Buffer containing an orphan surrogate to a String\n// currently works, but converting a String to a Buffer (via `new Buffer`, or\n// Buffer#write) will replace incomplete surrogates with the unicode\n// replacement character. See https://codereview.chromium.org/121173009/ .\nStringDecoder.prototype.write = function(buffer) {\n  var charStr = '';\n  // if our last write ended with an incomplete multibyte character\n  while (this.charLength) {\n    // determine how many remaining bytes this buffer has to offer for this char\n    var available = (buffer.length >= this.charLength - this.charReceived) ?\n        this.charLength - this.charReceived :\n        buffer.length;\n\n    // add the new bytes to the char buffer\n    buffer.copy(this.charBuffer, this.charReceived, 0, available);\n    this.charReceived += available;\n\n    if (this.charReceived < this.charLength) {\n      // still not enough chars in this buffer? wait for more ...\n      return '';\n    }\n\n    // remove bytes belonging to the current character from the buffer\n    buffer = buffer.slice(available, buffer.length);\n\n    // get the character that was split\n    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);\n\n    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character\n    var charCode = charStr.charCodeAt(charStr.length - 1);\n    if (charCode >= 0xD800 && charCode <= 0xDBFF) {\n      this.charLength += this.surrogateSize;\n      charStr = '';\n      continue;\n    }\n    this.charReceived = this.charLength = 0;\n\n    // if there are no more bytes in this buffer, just emit our char\n    if (buffer.length === 0) {\n      return charStr;\n    }\n    break;\n  }\n\n  // determine and set charLength / charReceived\n  this.detectIncompleteChar(buffer);\n\n  var end = buffer.length;\n  if (this.charLength) {\n    // buffer the incomplete character bytes we got\n    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);\n    end -= this.charReceived;\n  }\n\n  charStr += buffer.toString(this.encoding, 0, end);\n\n  var end = charStr.length - 1;\n  var charCode = charStr.charCodeAt(end);\n  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character\n  if (charCode >= 0xD800 && charCode <= 0xDBFF) {\n    var size = this.surrogateSize;\n    this.charLength += size;\n    this.charReceived += size;\n    this.charBuffer.copy(this.charBuffer, size, 0, size);\n    buffer.copy(this.charBuffer, 0, 0, size);\n    return charStr.substring(0, end);\n  }\n\n  // or just emit the charStr\n  return charStr;\n};\n\n// detectIncompleteChar determines if there is an incomplete UTF-8 character at\n// the end of the given buffer. If so, it sets this.charLength to the byte\n// length that character, and sets this.charReceived to the number of bytes\n// that are available for this character.\nStringDecoder.prototype.detectIncompleteChar = function(buffer) {\n  // determine how many bytes we have to check at the end of this buffer\n  var i = (buffer.length >= 3) ? 3 : buffer.length;\n\n  // Figure out if one of the last i bytes of our buffer announces an\n  // incomplete char.\n  for (; i > 0; i--) {\n    var c = buffer[buffer.length - i];\n\n    // See http://en.wikipedia.org/wiki/UTF-8#Description\n\n    // 110XXXXX\n    if (i == 1 && c >> 5 == 0x06) {\n      this.charLength = 2;\n      break;\n    }\n\n    // 1110XXXX\n    if (i <= 2 && c >> 4 == 0x0E) {\n      this.charLength = 3;\n      break;\n    }\n\n    // 11110XXX\n    if (i <= 3 && c >> 3 == 0x1E) {\n      this.charLength = 4;\n      break;\n    }\n  }\n  this.charReceived = i;\n};\n\nStringDecoder.prototype.end = function(buffer) {\n  var res = '';\n  if (buffer && buffer.length)\n    res = this.write(buffer);\n\n  if (this.charReceived) {\n    var cr = this.charReceived;\n    var buf = this.charBuffer;\n    var enc = this.encoding;\n    res += buf.slice(0, cr).toString(enc);\n  }\n\n  return res;\n};\n\nfunction passThroughWrite(buffer) {\n  return buffer.toString(this.encoding);\n}\n\nfunction utf16DetectIncompleteChar(buffer) {\n  this.charReceived = buffer.length % 2;\n  this.charLength = this.charReceived ? 2 : 0;\n}\n\nfunction base64DetectIncompleteChar(buffer) {\n  this.charReceived = buffer.length % 3;\n  this.charLength = this.charReceived ? 3 : 0;\n}\n",
-    "\n/**\n * Module exports.\n */\n\nmodule.exports = deprecate;\n\n/**\n * Mark that a method should not be used.\n * Returns a modified function which warns once by default.\n *\n * If `localStorage.noDeprecation = true` is set, then it is a no-op.\n *\n * If `localStorage.throwDeprecation = true` is set, then deprecated functions\n * will throw an Error when invoked.\n *\n * If `localStorage.traceDeprecation = true` is set, then deprecated functions\n * will invoke `console.trace()` instead of `console.error()`.\n *\n * @param {Function} fn - the function to deprecate\n * @param {String} msg - the string to print to the console when `fn` is invoked\n * @returns {Function} a new \"deprecated\" version of `fn`\n * @api public\n */\n\nfunction deprecate (fn, msg) {\n  if (config('noDeprecation')) {\n    return fn;\n  }\n\n  var warned = false;\n  function deprecated() {\n    if (!warned) {\n      if (config('throwDeprecation')) {\n        throw new Error(msg);\n      } else if (config('traceDeprecation')) {\n        console.trace(msg);\n      } else {\n        console.warn(msg);\n      }\n      warned = true;\n    }\n    return fn.apply(this, arguments);\n  }\n\n  return deprecated;\n}\n\n/**\n * Checks `localStorage` for boolean values for the given `name`.\n *\n * @param {String} name\n * @returns {Boolean}\n * @api private\n */\n\nfunction config (name) {\n  // accessing global.localStorage can trigger a DOMException in sandboxed iframes\n  try {\n    if (!global.localStorage) return false;\n  } catch (_) {\n    return false;\n  }\n  var val = global.localStorage[name];\n  if (null == val) return false;\n  return String(val).toLowerCase() === 'true';\n}\n",
-    "var Stream = (function (){\n  try {\n    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify\n  } catch(_){}\n}());\nexports = module.exports = require('./lib/_stream_readable.js');\nexports.Stream = Stream || exports;\nexports.Readable = exports;\nexports.Writable = require('./lib/_stream_writable.js');\nexports.Duplex = require('./lib/_stream_duplex.js');\nexports.Transform = require('./lib/_stream_transform.js');\nexports.PassThrough = require('./lib/_stream_passthrough.js');\n",
     "'use strict';\n\n// lightweight Buffer shim for pbf browser build\n// based on code from github.com/feross/buffer (MIT-licensed)\n\nmodule.exports = Buffer;\n\nvar ieee754 = require('ieee754');\n\nvar BufferMethods;\n\nfunction Buffer(length) {\n    var arr;\n    if (length && length.length) {\n        arr = length;\n        length = arr.length;\n    }\n    var buf = new Uint8Array(length || 0);\n    if (arr) buf.set(arr);\n\n    buf.readUInt32LE = BufferMethods.readUInt32LE;\n    buf.writeUInt32LE = BufferMethods.writeUInt32LE;\n    buf.readInt32LE = BufferMethods.readInt32LE;\n    buf.writeInt32LE = BufferMethods.writeInt32LE;\n    buf.readFloatLE = BufferMethods.readFloatLE;\n    buf.writeFloatLE = BufferMethods.writeFloatLE;\n    buf.readDoubleLE = BufferMethods.readDoubleLE;\n    buf.writeDoubleLE = BufferMethods.writeDoubleLE;\n    buf.toString = BufferMethods.toString;\n    buf.write = BufferMethods.write;\n    buf.slice = BufferMethods.slice;\n    buf.copy = BufferMethods.copy;\n\n    buf._isBuffer = true;\n    return buf;\n}\n\nvar lastStr, lastStrEncoded;\n\nBufferMethods = {\n    readUInt32LE: function(pos) {\n        return ((this[pos]) |\n            (this[pos + 1] << 8) |\n            (this[pos + 2] << 16)) +\n            (this[pos + 3] * 0x1000000);\n    },\n\n    writeUInt32LE: function(val, pos) {\n        this[pos] = val;\n        this[pos + 1] = (val >>> 8);\n        this[pos + 2] = (val >>> 16);\n        this[pos + 3] = (val >>> 24);\n    },\n\n    readInt32LE: function(pos) {\n        return ((this[pos]) |\n            (this[pos + 1] << 8) |\n            (this[pos + 2] << 16)) +\n            (this[pos + 3] << 24);\n    },\n\n    readFloatLE:  function(pos) { return ieee754.read(this, pos, true, 23, 4); },\n    readDoubleLE: function(pos) { return ieee754.read(this, pos, true, 52, 8); },\n\n    writeFloatLE:  function(val, pos) { return ieee754.write(this, val, pos, true, 23, 4); },\n    writeDoubleLE: function(val, pos) { return ieee754.write(this, val, pos, true, 52, 8); },\n\n    toString: function(encoding, start, end) {\n        var str = '',\n            tmp = '';\n\n        start = start || 0;\n        end = Math.min(this.length, end || this.length);\n\n        for (var i = start; i < end; i++) {\n            var ch = this[i];\n            if (ch <= 0x7F) {\n                str += decodeURIComponent(tmp) + String.fromCharCode(ch);\n                tmp = '';\n            } else {\n                tmp += '%' + ch.toString(16);\n            }\n        }\n\n        str += decodeURIComponent(tmp);\n\n        return str;\n    },\n\n    write: function(str, pos) {\n        var bytes = str === lastStr ? lastStrEncoded : encodeString(str);\n        for (var i = 0; i < bytes.length; i++) {\n            this[pos + i] = bytes[i];\n        }\n    },\n\n    slice: function(start, end) {\n        return this.subarray(start, end);\n    },\n\n    copy: function(buf, pos) {\n        pos = pos || 0;\n        for (var i = 0; i < this.length; i++) {\n            buf[pos + i] = this[i];\n        }\n    }\n};\n\nBufferMethods.writeInt32LE = BufferMethods.writeUInt32LE;\n\nBuffer.byteLength = function(str) {\n    lastStr = str;\n    lastStrEncoded = encodeString(str);\n    return lastStrEncoded.length;\n};\n\nBuffer.isBuffer = function(buf) {\n    return !!(buf && buf._isBuffer);\n};\n\nfunction encodeString(str) {\n    var length = str.length,\n        bytes = [];\n\n    for (var i = 0, c, lead; i < length; i++) {\n        c = str.charCodeAt(i); // code point\n\n        if (c > 0xD7FF && c < 0xE000) {\n\n            if (lead) {\n                if (c < 0xDC00) {\n                    bytes.push(0xEF, 0xBF, 0xBD);\n                    lead = c;\n                    continue;\n\n                } else {\n                    c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;\n                    lead = null;\n                }\n\n            } else {\n                if (c > 0xDBFF || (i + 1 === length)) bytes.push(0xEF, 0xBF, 0xBD);\n                else lead = c;\n\n                continue;\n            }\n\n        } else if (lead) {\n            bytes.push(0xEF, 0xBF, 0xBD);\n            lead = null;\n        }\n\n        if (c < 0x80) bytes.push(c);\n        else if (c < 0x800) bytes.push(c >> 0x6 | 0xC0, c & 0x3F | 0x80);\n        else if (c < 0x10000) bytes.push(c >> 0xC | 0xE0, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);\n        else bytes.push(c >> 0x12 | 0xF0, c >> 0xC & 0x3F | 0x80, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);\n    }\n    return bytes;\n}\n",
     "'use strict';\n\nmodule.exports = Pbf;\n\nvar Buffer = global.Buffer || require('./buffer');\n\nfunction Pbf(buf) {\n    this.buf = !Buffer.isBuffer(buf) ? new Buffer(buf || 0) : buf;\n    this.pos = 0;\n    this.length = this.buf.length;\n}\n\nPbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum\nPbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64\nPbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields\nPbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32\n\nvar SHIFT_LEFT_32 = (1 << 16) * (1 << 16),\n    SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32,\n    POW_2_63 = Math.pow(2, 63);\n\nPbf.prototype = {\n\n    destroy: function() {\n        this.buf = null;\n    },\n\n    // === READING =================================================================\n\n    readFields: function(readField, result, end) {\n        end = end || this.length;\n\n        while (this.pos < end) {\n            var val = this.readVarint(),\n                tag = val >> 3,\n                startPos = this.pos;\n\n            readField(tag, result, this);\n\n            if (this.pos === startPos) this.skip(val);\n        }\n        return result;\n    },\n\n    readMessage: function(readField, result) {\n        return this.readFields(readField, result, this.readVarint() + this.pos);\n    },\n\n    readFixed32: function() {\n        var val = this.buf.readUInt32LE(this.pos);\n        this.pos += 4;\n        return val;\n    },\n\n    readSFixed32: function() {\n        var val = this.buf.readInt32LE(this.pos);\n        this.pos += 4;\n        return val;\n    },\n\n    // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)\n\n    readFixed64: function() {\n        var val = this.buf.readUInt32LE(this.pos) + this.buf.readUInt32LE(this.pos + 4) * SHIFT_LEFT_32;\n        this.pos += 8;\n        return val;\n    },\n\n    readSFixed64: function() {\n        var val = this.buf.readUInt32LE(this.pos) + this.buf.readInt32LE(this.pos + 4) * SHIFT_LEFT_32;\n        this.pos += 8;\n        return val;\n    },\n\n    readFloat: function() {\n        var val = this.buf.readFloatLE(this.pos);\n        this.pos += 4;\n        return val;\n    },\n\n    readDouble: function() {\n        var val = this.buf.readDoubleLE(this.pos);\n        this.pos += 8;\n        return val;\n    },\n\n    readVarint: function() {\n        var buf = this.buf,\n            val, b;\n\n        b = buf[this.pos++]; val  =  b & 0x7f;        if (b < 0x80) return val;\n        b = buf[this.pos++]; val |= (b & 0x7f) << 7;  if (b < 0x80) return val;\n        b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;\n        b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;\n\n        return readVarintRemainder(val, this);\n    },\n\n    readVarint64: function() {\n        var startPos = this.pos,\n            val = this.readVarint();\n\n        if (val < POW_2_63) return val;\n\n        var pos = this.pos - 2;\n        while (this.buf[pos] === 0xff) pos--;\n        if (pos < startPos) pos = startPos;\n\n        val = 0;\n        for (var i = 0; i < pos - startPos + 1; i++) {\n            var b = ~this.buf[startPos + i] & 0x7f;\n            val += i < 4 ? b << i * 7 : b * Math.pow(2, i * 7);\n        }\n\n        return -val - 1;\n    },\n\n    readSVarint: function() {\n        var num = this.readVarint();\n        return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding\n    },\n\n    readBoolean: function() {\n        return Boolean(this.readVarint());\n    },\n\n    readString: function() {\n        var end = this.readVarint() + this.pos,\n            str = this.buf.toString('utf8', this.pos, end);\n        this.pos = end;\n        return str;\n    },\n\n    readBytes: function() {\n        var end = this.readVarint() + this.pos,\n            buffer = this.buf.slice(this.pos, end);\n        this.pos = end;\n        return buffer;\n    },\n\n    // verbose for performance reasons; doesn't affect gzipped size\n\n    readPackedVarint: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readVarint());\n        return arr;\n    },\n    readPackedSVarint: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readSVarint());\n        return arr;\n    },\n    readPackedBoolean: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readBoolean());\n        return arr;\n    },\n    readPackedFloat: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readFloat());\n        return arr;\n    },\n    readPackedDouble: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readDouble());\n        return arr;\n    },\n    readPackedFixed32: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readFixed32());\n        return arr;\n    },\n    readPackedSFixed32: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readSFixed32());\n        return arr;\n    },\n    readPackedFixed64: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readFixed64());\n        return arr;\n    },\n    readPackedSFixed64: function() {\n        var end = this.readVarint() + this.pos, arr = [];\n        while (this.pos < end) arr.push(this.readSFixed64());\n        return arr;\n    },\n\n    skip: function(val) {\n        var type = val & 0x7;\n        if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}\n        else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;\n        else if (type === Pbf.Fixed32) this.pos += 4;\n        else if (type === Pbf.Fixed64) this.pos += 8;\n        else throw new Error('Unimplemented type: ' + type);\n    },\n\n    // === WRITING =================================================================\n\n    writeTag: function(tag, type) {\n        this.writeVarint((tag << 3) | type);\n    },\n\n    realloc: function(min) {\n        var length = this.length || 16;\n\n        while (length < this.pos + min) length *= 2;\n\n        if (length !== this.length) {\n            var buf = new Buffer(length);\n            this.buf.copy(buf);\n            this.buf = buf;\n            this.length = length;\n        }\n    },\n\n    finish: function() {\n        this.length = this.pos;\n        this.pos = 0;\n        return this.buf.slice(0, this.length);\n    },\n\n    writeFixed32: function(val) {\n        this.realloc(4);\n        this.buf.writeUInt32LE(val, this.pos);\n        this.pos += 4;\n    },\n\n    writeSFixed32: function(val) {\n        this.realloc(4);\n        this.buf.writeInt32LE(val, this.pos);\n        this.pos += 4;\n    },\n\n    writeFixed64: function(val) {\n        this.realloc(8);\n        this.buf.writeInt32LE(val & -1, this.pos);\n        this.buf.writeUInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);\n        this.pos += 8;\n    },\n\n    writeSFixed64: function(val) {\n        this.realloc(8);\n        this.buf.writeInt32LE(val & -1, this.pos);\n        this.buf.writeInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);\n        this.pos += 8;\n    },\n\n    writeVarint: function(val) {\n        val = +val;\n\n        if (val > 0xfffffff) {\n            writeBigVarint(val, this);\n            return;\n        }\n\n        this.realloc(4);\n\n        this.buf[this.pos++] =           val & 0x7f  | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;\n        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;\n        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;\n        this.buf[this.pos++] =   (val >>> 7) & 0x7f;\n    },\n\n    writeSVarint: function(val) {\n        this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);\n    },\n\n    writeBoolean: function(val) {\n        this.writeVarint(Boolean(val));\n    },\n\n    writeString: function(str) {\n        str = String(str);\n        var bytes = Buffer.byteLength(str);\n        this.writeVarint(bytes);\n        this.realloc(bytes);\n        this.buf.write(str, this.pos);\n        this.pos += bytes;\n    },\n\n    writeFloat: function(val) {\n        this.realloc(4);\n        this.buf.writeFloatLE(val, this.pos);\n        this.pos += 4;\n    },\n\n    writeDouble: function(val) {\n        this.realloc(8);\n        this.buf.writeDoubleLE(val, this.pos);\n        this.pos += 8;\n    },\n\n    writeBytes: function(buffer) {\n        var len = buffer.length;\n        this.writeVarint(len);\n        this.realloc(len);\n        for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];\n    },\n\n    writeRawMessage: function(fn, obj) {\n        this.pos++; // reserve 1 byte for short message length\n\n        // write the message directly to the buffer and see how much was written\n        var startPos = this.pos;\n        fn(obj, this);\n        var len = this.pos - startPos;\n\n        if (len >= 0x80) reallocForRawMessage(startPos, len, this);\n\n        // finally, write the message length in the reserved place and restore the position\n        this.pos = startPos - 1;\n        this.writeVarint(len);\n        this.pos += len;\n    },\n\n    writeMessage: function(tag, fn, obj) {\n        this.writeTag(tag, Pbf.Bytes);\n        this.writeRawMessage(fn, obj);\n    },\n\n    writePackedVarint:   function(tag, arr) { this.writeMessage(tag, writePackedVarint, arr);   },\n    writePackedSVarint:  function(tag, arr) { this.writeMessage(tag, writePackedSVarint, arr);  },\n    writePackedBoolean:  function(tag, arr) { this.writeMessage(tag, writePackedBoolean, arr);  },\n    writePackedFloat:    function(tag, arr) { this.writeMessage(tag, writePackedFloat, arr);    },\n    writePackedDouble:   function(tag, arr) { this.writeMessage(tag, writePackedDouble, arr);   },\n    writePackedFixed32:  function(tag, arr) { this.writeMessage(tag, writePackedFixed32, arr);  },\n    writePackedSFixed32: function(tag, arr) { this.writeMessage(tag, writePackedSFixed32, arr); },\n    writePackedFixed64:  function(tag, arr) { this.writeMessage(tag, writePackedFixed64, arr);  },\n    writePackedSFixed64: function(tag, arr) { this.writeMessage(tag, writePackedSFixed64, arr); },\n\n    writeBytesField: function(tag, buffer) {\n        this.writeTag(tag, Pbf.Bytes);\n        this.writeBytes(buffer);\n    },\n    writeFixed32Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed32);\n        this.writeFixed32(val);\n    },\n    writeSFixed32Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed32);\n        this.writeSFixed32(val);\n    },\n    writeFixed64Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed64);\n        this.writeFixed64(val);\n    },\n    writeSFixed64Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed64);\n        this.writeSFixed64(val);\n    },\n    writeVarintField: function(tag, val) {\n        this.writeTag(tag, Pbf.Varint);\n        this.writeVarint(val);\n    },\n    writeSVarintField: function(tag, val) {\n        this.writeTag(tag, Pbf.Varint);\n        this.writeSVarint(val);\n    },\n    writeStringField: function(tag, str) {\n        this.writeTag(tag, Pbf.Bytes);\n        this.writeString(str);\n    },\n    writeFloatField: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed32);\n        this.writeFloat(val);\n    },\n    writeDoubleField: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed64);\n        this.writeDouble(val);\n    },\n    writeBooleanField: function(tag, val) {\n        this.writeVarintField(tag, Boolean(val));\n    }\n};\n\nfunction readVarintRemainder(val, pbf) {\n    var buf = pbf.buf, b;\n\n    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x10000000;         if (b < 0x80) return val;\n    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x800000000;        if (b < 0x80) return val;\n    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x40000000000;      if (b < 0x80) return val;\n    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x2000000000000;    if (b < 0x80) return val;\n    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x100000000000000;  if (b < 0x80) return val;\n    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x8000000000000000; if (b < 0x80) return val;\n\n    throw new Error('Expected varint not more than 10 bytes');\n}\n\nfunction writeBigVarint(val, pbf) {\n    pbf.realloc(10);\n\n    var maxPos = pbf.pos + 10;\n\n    while (val >= 1) {\n        if (pbf.pos >= maxPos) throw new Error('Given varint doesn\\'t fit into 10 bytes');\n        var b = val & 0xff;\n        pbf.buf[pbf.pos++] = b | (val >= 0x80 ? 0x80 : 0);\n        val /= 0x80;\n    }\n}\n\nfunction reallocForRawMessage(startPos, len, pbf) {\n    var extraLen =\n        len <= 0x3fff ? 1 :\n        len <= 0x1fffff ? 2 :\n        len <= 0xfffffff ? 3 : Math.ceil(Math.log(len) / (Math.LN2 * 7));\n\n    // if 1 byte isn't enough for encoding message length, shift the data to the right\n    pbf.realloc(extraLen);\n    for (var i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];\n}\n\nfunction writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }\nfunction writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }\nfunction writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }\nfunction writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }\nfunction writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }\nfunction writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }\nfunction writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }\nfunction writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }\nfunction writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }\n",
+    "'use strict';\n\nmodule.exports = Point;\n\nfunction Point(x, y) {\n    this.x = x;\n    this.y = y;\n}\n\nPoint.prototype = {\n    clone: function() { return new Point(this.x, this.y); },\n\n    add:     function(p) { return this.clone()._add(p);     },\n    sub:     function(p) { return this.clone()._sub(p);     },\n    mult:    function(k) { return this.clone()._mult(k);    },\n    div:     function(k) { return this.clone()._div(k);     },\n    rotate:  function(a) { return this.clone()._rotate(a);  },\n    matMult: function(m) { return this.clone()._matMult(m); },\n    unit:    function() { return this.clone()._unit(); },\n    perp:    function() { return this.clone()._perp(); },\n    round:   function() { return this.clone()._round(); },\n\n    mag: function() {\n        return Math.sqrt(this.x * this.x + this.y * this.y);\n    },\n\n    equals: function(p) {\n        return this.x === p.x &&\n               this.y === p.y;\n    },\n\n    dist: function(p) {\n        return Math.sqrt(this.distSqr(p));\n    },\n\n    distSqr: function(p) {\n        var dx = p.x - this.x,\n            dy = p.y - this.y;\n        return dx * dx + dy * dy;\n    },\n\n    angle: function() {\n        return Math.atan2(this.y, this.x);\n    },\n\n    angleTo: function(b) {\n        return Math.atan2(this.y - b.y, this.x - b.x);\n    },\n\n    angleWith: function(b) {\n        return this.angleWithSep(b.x, b.y);\n    },\n\n    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.\n    angleWithSep: function(x, y) {\n        return Math.atan2(\n            this.x * y - this.y * x,\n            this.x * x + this.y * y);\n    },\n\n    _matMult: function(m) {\n        var x = m[0] * this.x + m[1] * this.y,\n            y = m[2] * this.x + m[3] * this.y;\n        this.x = x;\n        this.y = y;\n        return this;\n    },\n\n    _add: function(p) {\n        this.x += p.x;\n        this.y += p.y;\n        return this;\n    },\n\n    _sub: function(p) {\n        this.x -= p.x;\n        this.y -= p.y;\n        return this;\n    },\n\n    _mult: function(k) {\n        this.x *= k;\n        this.y *= k;\n        return this;\n    },\n\n    _div: function(k) {\n        this.x /= k;\n        this.y /= k;\n        return this;\n    },\n\n    _unit: function() {\n        this._div(this.mag());\n        return this;\n    },\n\n    _perp: function() {\n        var y = this.y;\n        this.y = this.x;\n        this.x = -y;\n        return this;\n    },\n\n    _rotate: function(angle) {\n        var cos = Math.cos(angle),\n            sin = Math.sin(angle),\n            x = cos * this.x - sin * this.y,\n            y = sin * this.x + cos * this.y;\n        this.x = x;\n        this.y = y;\n        return this;\n    },\n\n    _round: function() {\n        this.x = Math.round(this.x);\n        this.y = Math.round(this.y);\n        return this;\n    }\n};\n\n// constructs Point from an array if necessary\nPoint.convert = function (a) {\n    if (a instanceof Point) {\n        return a;\n    }\n    if (Array.isArray(a)) {\n        return new Point(a[0], a[1]);\n    }\n    return a;\n};\n",
+    "'use strict';\n\nif (!process.version ||\n    process.version.indexOf('v0.') === 0 ||\n    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {\n  module.exports = nextTick;\n} else {\n  module.exports = process.nextTick;\n}\n\nfunction nextTick(fn, arg1, arg2, arg3) {\n  if (typeof fn !== 'function') {\n    throw new TypeError('\"callback\" argument must be a function');\n  }\n  var len = arguments.length;\n  var args, i;\n  switch (len) {\n  case 0:\n  case 1:\n    return process.nextTick(fn);\n  case 2:\n    return process.nextTick(function afterTickOne() {\n      fn.call(null, arg1);\n    });\n  case 3:\n    return process.nextTick(function afterTickTwo() {\n      fn.call(null, arg1, arg2);\n    });\n  case 4:\n    return process.nextTick(function afterTickThree() {\n      fn.call(null, arg1, arg2, arg3);\n    });\n  default:\n    args = new Array(len - 1);\n    i = 0;\n    while (i < args.length) {\n      args[i++] = arguments[i];\n    }\n    return process.nextTick(function afterTick() {\n      fn.apply(null, args);\n    });\n  }\n}\n",
+    "// shim for using process in browser\nvar process = module.exports = {};\n\n// cached from whatever global is present so that test runners that stub it\n// don't break things.  But we need to wrap it in a try catch in case it is\n// wrapped in strict mode code which doesn't define any globals.  It's inside a\n// function because try/catches deoptimize in certain engines.\n\nvar cachedSetTimeout;\nvar cachedClearTimeout;\n\nfunction defaultSetTimout() {\n    throw new Error('setTimeout has not been defined');\n}\nfunction defaultClearTimeout () {\n    throw new Error('clearTimeout has not been defined');\n}\n(function () {\n    try {\n        if (typeof setTimeout === 'function') {\n            cachedSetTimeout = setTimeout;\n        } else {\n            cachedSetTimeout = defaultSetTimout;\n        }\n    } catch (e) {\n        cachedSetTimeout = defaultSetTimout;\n    }\n    try {\n        if (typeof clearTimeout === 'function') {\n            cachedClearTimeout = clearTimeout;\n        } else {\n            cachedClearTimeout = defaultClearTimeout;\n        }\n    } catch (e) {\n        cachedClearTimeout = defaultClearTimeout;\n    }\n} ())\nfunction runTimeout(fun) {\n    if (cachedSetTimeout === setTimeout) {\n        //normal enviroments in sane situations\n        return setTimeout(fun, 0);\n    }\n    // if setTimeout wasn't available but was latter defined\n    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {\n        cachedSetTimeout = setTimeout;\n        return setTimeout(fun, 0);\n    }\n    try {\n        // when when somebody has screwed with setTimeout but no I.E. maddness\n        return cachedSetTimeout(fun, 0);\n    } catch(e){\n        try {\n            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally\n            return cachedSetTimeout.call(null, fun, 0);\n        } catch(e){\n            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error\n            return cachedSetTimeout.call(this, fun, 0);\n        }\n    }\n\n\n}\nfunction runClearTimeout(marker) {\n    if (cachedClearTimeout === clearTimeout) {\n        //normal enviroments in sane situations\n        return clearTimeout(marker);\n    }\n    // if clearTimeout wasn't available but was latter defined\n    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {\n        cachedClearTimeout = clearTimeout;\n        return clearTimeout(marker);\n    }\n    try {\n        // when when somebody has screwed with setTimeout but no I.E. maddness\n        return cachedClearTimeout(marker);\n    } catch (e){\n        try {\n            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally\n            return cachedClearTimeout.call(null, marker);\n        } catch (e){\n            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.\n            // Some versions of I.E. have different rules for clearTimeout vs setTimeout\n            return cachedClearTimeout.call(this, marker);\n        }\n    }\n\n\n\n}\nvar queue = [];\nvar draining = false;\nvar currentQueue;\nvar queueIndex = -1;\n\nfunction cleanUpNextTick() {\n    if (!draining || !currentQueue) {\n        return;\n    }\n    draining = false;\n    if (currentQueue.length) {\n        queue = currentQueue.concat(queue);\n    } else {\n        queueIndex = -1;\n    }\n    if (queue.length) {\n        drainQueue();\n    }\n}\n\nfunction drainQueue() {\n    if (draining) {\n        return;\n    }\n    var timeout = runTimeout(cleanUpNextTick);\n    draining = true;\n\n    var len = queue.length;\n    while(len) {\n        currentQueue = queue;\n        queue = [];\n        while (++queueIndex < len) {\n            if (currentQueue) {\n                currentQueue[queueIndex].run();\n            }\n        }\n        queueIndex = -1;\n        len = queue.length;\n    }\n    currentQueue = null;\n    draining = false;\n    runClearTimeout(timeout);\n}\n\nprocess.nextTick = function (fun) {\n    var args = new Array(arguments.length - 1);\n    if (arguments.length > 1) {\n        for (var i = 1; i < arguments.length; i++) {\n            args[i - 1] = arguments[i];\n        }\n    }\n    queue.push(new Item(fun, args));\n    if (queue.length === 1 && !draining) {\n        runTimeout(drainQueue);\n    }\n};\n\n// v8 likes predictible objects\nfunction Item(fun, array) {\n    this.fun = fun;\n    this.array = array;\n}\nItem.prototype.run = function () {\n    this.fun.apply(null, this.array);\n};\nprocess.title = 'browser';\nprocess.browser = true;\nprocess.env = {};\nprocess.argv = [];\nprocess.version = ''; // empty string to avoid regexp issues\nprocess.versions = {};\n\nfunction noop() {}\n\nprocess.on = noop;\nprocess.addListener = noop;\nprocess.once = noop;\nprocess.off = noop;\nprocess.removeListener = noop;\nprocess.removeAllListeners = noop;\nprocess.emit = noop;\n\nprocess.binding = function (name) {\n    throw new Error('process.binding is not supported');\n};\n\nprocess.cwd = function () { return '/' };\nprocess.chdir = function (dir) {\n    throw new Error('process.chdir is not supported');\n};\nprocess.umask = function() { return 0; };\n",
+    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar Buffer = require('buffer').Buffer;\n\nvar isBufferEncoding = Buffer.isEncoding\n  || function(encoding) {\n       switch (encoding && encoding.toLowerCase()) {\n         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;\n         default: return false;\n       }\n     }\n\n\nfunction assertEncoding(encoding) {\n  if (encoding && !isBufferEncoding(encoding)) {\n    throw new Error('Unknown encoding: ' + encoding);\n  }\n}\n\n// StringDecoder provides an interface for efficiently splitting a series of\n// buffers into a series of JS strings without breaking apart multi-byte\n// characters. CESU-8 is handled as part of the UTF-8 encoding.\n//\n// @TODO Handling all encodings inside a single object makes it very difficult\n// to reason about this code, so it should be split up in the future.\n// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code\n// points as used by CESU-8.\nvar StringDecoder = exports.StringDecoder = function(encoding) {\n  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');\n  assertEncoding(encoding);\n  switch (this.encoding) {\n    case 'utf8':\n      // CESU-8 represents each of Surrogate Pair by 3-bytes\n      this.surrogateSize = 3;\n      break;\n    case 'ucs2':\n    case 'utf16le':\n      // UTF-16 represents each of Surrogate Pair by 2-bytes\n      this.surrogateSize = 2;\n      this.detectIncompleteChar = utf16DetectIncompleteChar;\n      break;\n    case 'base64':\n      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.\n      this.surrogateSize = 3;\n      this.detectIncompleteChar = base64DetectIncompleteChar;\n      break;\n    default:\n      this.write = passThroughWrite;\n      return;\n  }\n\n  // Enough space to store all bytes of a single character. UTF-8 needs 4\n  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).\n  this.charBuffer = new Buffer(6);\n  // Number of bytes received for the current incomplete multi-byte character.\n  this.charReceived = 0;\n  // Number of bytes expected for the current incomplete multi-byte character.\n  this.charLength = 0;\n};\n\n\n// write decodes the given buffer and returns it as JS string that is\n// guaranteed to not contain any partial multi-byte characters. Any partial\n// character found at the end of the buffer is buffered up, and will be\n// returned when calling write again with the remaining bytes.\n//\n// Note: Converting a Buffer containing an orphan surrogate to a String\n// currently works, but converting a String to a Buffer (via `new Buffer`, or\n// Buffer#write) will replace incomplete surrogates with the unicode\n// replacement character. See https://codereview.chromium.org/121173009/ .\nStringDecoder.prototype.write = function(buffer) {\n  var charStr = '';\n  // if our last write ended with an incomplete multibyte character\n  while (this.charLength) {\n    // determine how many remaining bytes this buffer has to offer for this char\n    var available = (buffer.length >= this.charLength - this.charReceived) ?\n        this.charLength - this.charReceived :\n        buffer.length;\n\n    // add the new bytes to the char buffer\n    buffer.copy(this.charBuffer, this.charReceived, 0, available);\n    this.charReceived += available;\n\n    if (this.charReceived < this.charLength) {\n      // still not enough chars in this buffer? wait for more ...\n      return '';\n    }\n\n    // remove bytes belonging to the current character from the buffer\n    buffer = buffer.slice(available, buffer.length);\n\n    // get the character that was split\n    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);\n\n    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character\n    var charCode = charStr.charCodeAt(charStr.length - 1);\n    if (charCode >= 0xD800 && charCode <= 0xDBFF) {\n      this.charLength += this.surrogateSize;\n      charStr = '';\n      continue;\n    }\n    this.charReceived = this.charLength = 0;\n\n    // if there are no more bytes in this buffer, just emit our char\n    if (buffer.length === 0) {\n      return charStr;\n    }\n    break;\n  }\n\n  // determine and set charLength / charReceived\n  this.detectIncompleteChar(buffer);\n\n  var end = buffer.length;\n  if (this.charLength) {\n    // buffer the incomplete character bytes we got\n    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);\n    end -= this.charReceived;\n  }\n\n  charStr += buffer.toString(this.encoding, 0, end);\n\n  var end = charStr.length - 1;\n  var charCode = charStr.charCodeAt(end);\n  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character\n  if (charCode >= 0xD800 && charCode <= 0xDBFF) {\n    var size = this.surrogateSize;\n    this.charLength += size;\n    this.charReceived += size;\n    this.charBuffer.copy(this.charBuffer, size, 0, size);\n    buffer.copy(this.charBuffer, 0, 0, size);\n    return charStr.substring(0, end);\n  }\n\n  // or just emit the charStr\n  return charStr;\n};\n\n// detectIncompleteChar determines if there is an incomplete UTF-8 character at\n// the end of the given buffer. If so, it sets this.charLength to the byte\n// length that character, and sets this.charReceived to the number of bytes\n// that are available for this character.\nStringDecoder.prototype.detectIncompleteChar = function(buffer) {\n  // determine how many bytes we have to check at the end of this buffer\n  var i = (buffer.length >= 3) ? 3 : buffer.length;\n\n  // Figure out if one of the last i bytes of our buffer announces an\n  // incomplete char.\n  for (; i > 0; i--) {\n    var c = buffer[buffer.length - i];\n\n    // See http://en.wikipedia.org/wiki/UTF-8#Description\n\n    // 110XXXXX\n    if (i == 1 && c >> 5 == 0x06) {\n      this.charLength = 2;\n      break;\n    }\n\n    // 1110XXXX\n    if (i <= 2 && c >> 4 == 0x0E) {\n      this.charLength = 3;\n      break;\n    }\n\n    // 11110XXX\n    if (i <= 3 && c >> 3 == 0x1E) {\n      this.charLength = 4;\n      break;\n    }\n  }\n  this.charReceived = i;\n};\n\nStringDecoder.prototype.end = function(buffer) {\n  var res = '';\n  if (buffer && buffer.length)\n    res = this.write(buffer);\n\n  if (this.charReceived) {\n    var cr = this.charReceived;\n    var buf = this.charBuffer;\n    var enc = this.encoding;\n    res += buf.slice(0, cr).toString(enc);\n  }\n\n  return res;\n};\n\nfunction passThroughWrite(buffer) {\n  return buffer.toString(this.encoding);\n}\n\nfunction utf16DetectIncompleteChar(buffer) {\n  this.charReceived = buffer.length % 2;\n  this.charLength = this.charReceived ? 2 : 0;\n}\n\nfunction base64DetectIncompleteChar(buffer) {\n  this.charReceived = buffer.length % 3;\n  this.charLength = this.charReceived ? 3 : 0;\n}\n",
     "/*!\n * strip-comments <https://github.com/jonschlinkert/strip-comments>\n *\n * Copyright (c) 2014 Jon Schlinkert, contributors.\n * Licensed under the MIT license.\n */\n\n'use stric';\n\nvar reBlock = '\\\\/\\\\*';\nvar reBlockIgnore = '\\\\/\\\\*(?!\\\\*?\\\\!)';\nvar reBlockEnd = '(.|[\\\\r\\\\n]|\\\\n)*?\\\\*\\\\/\\\\n?\\\\n?';\nvar reLine = /(^|[^\\S\\n])(?:\\/\\/)([\\s\\S]+?)$/gm;\nvar reLineIgnore = /(^|[^\\S\\n])(?:\\/\\/[^!])([\\s\\S]+?)$/gm;\n\n\n/**\n * Strip all comments\n *\n * {%= docs(\"strip\") %}\n *\n * @param   {String} `str`  file contents or string to strip.\n * @param   {Object} `opts`  options are passed to `.block`, and `.line`\n * @return  {String} String without comments.\n * @api public\n */\n\nvar strip = module.exports = function(str, opts) {\n  return str ? strip.block(strip.line(str, opts), opts) : '';\n};\n\n\n/**\n * Strip only block comments, optionally leaving protected comments\n * (e.g. `/*!`) intact.\n *\n * {%= docs(\"block\") %}\n *\n * @param   {String} `str`  file content or string to strip to\n * @param   {Object} `opts`  if `safe:true`, strip only comments that do not start with `/*!` or `/**!`\n * @return  {String} String without block comments.\n * @api public\n */\n\nstrip.block = function(str, opts) {\n  opts = opts || {};\n  var re = new RegExp(reBlock + reBlockEnd, 'gm');\n  if(opts.safe) {\n    re = new RegExp(reBlockIgnore + reBlockEnd, 'gm');\n  }\n  return str ? str.replace(re, '') : '';\n};\n\n\n/**\n * Strip only line comments\n *\n * {%= docs(\"line\") %}\n *\n * @param   {String} `str`  file content or string to strip to\n * @param   {Object} `opts`  if `safe:true`, strip all that not starts with `//!`\n * @return  {String} String without line comments.\n * @api public\n */\n\nstrip.line = function(str, opts) {\n  opts = opts || {};\n  var re = reLine;\n  if(opts.safe) {\n    re = reLineIgnore;\n  }\n  return str ? str.replace(re, '') : '';\n};\n",
     "// https://github.com/topojson/topojson-client Version 2.1.0. Copyright 2016 Mike Bostock.\n(function (global, factory) {\n  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :\n  typeof define === 'function' && define.amd ? define(['exports'], factory) :\n  (factory((global.topojson = global.topojson || {})));\n}(this, (function (exports) { 'use strict';\n\nvar reverse = function(array, n) {\n  var t, j = array.length, i = j - n;\n  while (i < --j) t = array[i], array[i++] = array[j], array[j] = t;\n};\n\nvar identity = function(x) {\n  return x;\n};\n\nvar transform = function(topology) {\n  if ((transform = topology.transform) == null) return identity;\n  var transform,\n      x0,\n      y0,\n      kx = transform.scale[0],\n      ky = transform.scale[1],\n      dx = transform.translate[0],\n      dy = transform.translate[1];\n  return function(point, i) {\n    if (!i) x0 = y0 = 0;\n    point[0] = (x0 += point[0]) * kx + dx;\n    point[1] = (y0 += point[1]) * ky + dy;\n    return point;\n  };\n};\n\nvar feature = function(topology, o) {\n  return o.type === \"GeometryCollection\"\n      ? {type: \"FeatureCollection\", features: o.geometries.map(function(o) { return feature$1(topology, o); })}\n      : feature$1(topology, o);\n};\n\nfunction feature$1(topology, o) {\n  var id = o.id,\n      bbox = o.bbox,\n      properties = o.properties == null ? {} : o.properties,\n      geometry = object(topology, o);\n  return id == null && bbox == null ? {type: \"Feature\", properties: properties, geometry: geometry}\n      : bbox == null ? {type: \"Feature\", id: id, properties: properties, geometry: geometry}\n      : {type: \"Feature\", id: id, bbox: bbox, properties: properties, geometry: geometry};\n}\n\nfunction object(topology, o) {\n  var transformPoint = transform(topology),\n      arcs = topology.arcs;\n\n  function arc(i, points) {\n    if (points.length) points.pop();\n    for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length; k < n; ++k) {\n      points.push(transformPoint(a[k].slice(), k));\n    }\n    if (i < 0) reverse(points, n);\n  }\n\n  function point(p) {\n    return transformPoint(p.slice());\n  }\n\n  function line(arcs) {\n    var points = [];\n    for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points);\n    if (points.length < 2) points.push(points[0].slice());\n    return points;\n  }\n\n  function ring(arcs) {\n    var points = line(arcs);\n    while (points.length < 4) points.push(points[0].slice());\n    return points;\n  }\n\n  function polygon(arcs) {\n    return arcs.map(ring);\n  }\n\n  function geometry(o) {\n    var type = o.type, coordinates;\n    switch (type) {\n      case \"GeometryCollection\": return {type: type, geometries: o.geometries.map(geometry)};\n      case \"Point\": coordinates = point(o.coordinates); break;\n      case \"MultiPoint\": coordinates = o.coordinates.map(point); break;\n      case \"LineString\": coordinates = line(o.arcs); break;\n      case \"MultiLineString\": coordinates = o.arcs.map(line); break;\n      case \"Polygon\": coordinates = polygon(o.arcs); break;\n      case \"MultiPolygon\": coordinates = o.arcs.map(polygon); break;\n      default: return null;\n    }\n    return {type: type, coordinates: coordinates};\n  }\n\n  return geometry(o);\n}\n\n// export {default as bbox} from \"./src/bbox\";\n\n// export {default as mesh, meshArcs} from \"./src/mesh\";\n// export {default as merge, mergeArcs} from \"./src/merge\";\n// export {default as neighbors} from \"./src/neighbors\";\n// export {default as quantize} from \"./src/quantize\";\n// export {default as transform} from \"./src/transform\";\n// export {default as untransform} from \"./src/untransform\";\n\nexports.feature = feature;\n\nObject.defineProperty(exports, '__esModule', { value: true });\n\n})));\n",
+    "\n/**\n * Module exports.\n */\n\nmodule.exports = deprecate;\n\n/**\n * Mark that a method should not be used.\n * Returns a modified function which warns once by default.\n *\n * If `localStorage.noDeprecation = true` is set, then it is a no-op.\n *\n * If `localStorage.throwDeprecation = true` is set, then deprecated functions\n * will throw an Error when invoked.\n *\n * If `localStorage.traceDeprecation = true` is set, then deprecated functions\n * will invoke `console.trace()` instead of `console.error()`.\n *\n * @param {Function} fn - the function to deprecate\n * @param {String} msg - the string to print to the console when `fn` is invoked\n * @returns {Function} a new \"deprecated\" version of `fn`\n * @api public\n */\n\nfunction deprecate (fn, msg) {\n  if (config('noDeprecation')) {\n    return fn;\n  }\n\n  var warned = false;\n  function deprecated() {\n    if (!warned) {\n      if (config('throwDeprecation')) {\n        throw new Error(msg);\n      } else if (config('traceDeprecation')) {\n        console.trace(msg);\n      } else {\n        console.warn(msg);\n      }\n      warned = true;\n    }\n    return fn.apply(this, arguments);\n  }\n\n  return deprecated;\n}\n\n/**\n * Checks `localStorage` for boolean values for the given `name`.\n *\n * @param {String} name\n * @returns {Boolean}\n * @api private\n */\n\nfunction config (name) {\n  // accessing global.localStorage can trigger a DOMException in sandboxed iframes\n  try {\n    if (!global.localStorage) return false;\n  } catch (_) {\n    return false;\n  }\n  var val = global.localStorage[name];\n  if (null == val) return false;\n  return String(val).toLowerCase() === 'true';\n}\n",
+    "module.exports = function isBuffer(arg) {\n  return arg && typeof arg === 'object'\n    && typeof arg.copy === 'function'\n    && typeof arg.fill === 'function'\n    && typeof arg.readUInt8 === 'function';\n}",
+    "// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar formatRegExp = /%[sdj%]/g;\nexports.format = function(f) {\n  if (!isString(f)) {\n    var objects = [];\n    for (var i = 0; i < arguments.length; i++) {\n      objects.push(inspect(arguments[i]));\n    }\n    return objects.join(' ');\n  }\n\n  var i = 1;\n  var args = arguments;\n  var len = args.length;\n  var str = String(f).replace(formatRegExp, function(x) {\n    if (x === '%%') return '%';\n    if (i >= len) return x;\n    switch (x) {\n      case '%s': return String(args[i++]);\n      case '%d': return Number(args[i++]);\n      case '%j':\n        try {\n          return JSON.stringify(args[i++]);\n        } catch (_) {\n          return '[Circular]';\n        }\n      default:\n        return x;\n    }\n  });\n  for (var x = args[i]; i < len; x = args[++i]) {\n    if (isNull(x) || !isObject(x)) {\n      str += ' ' + x;\n    } else {\n      str += ' ' + inspect(x);\n    }\n  }\n  return str;\n};\n\n\n// Mark that a method should not be used.\n// Returns a modified function which warns once by default.\n// If --no-deprecation is set, then it is a no-op.\nexports.deprecate = function(fn, msg) {\n  // Allow for deprecating things in the process of starting up.\n  if (isUndefined(global.process)) {\n    return function() {\n      return exports.deprecate(fn, msg).apply(this, arguments);\n    };\n  }\n\n  if (process.noDeprecation === true) {\n    return fn;\n  }\n\n  var warned = false;\n  function deprecated() {\n    if (!warned) {\n      if (process.throwDeprecation) {\n        throw new Error(msg);\n      } else if (process.traceDeprecation) {\n        console.trace(msg);\n      } else {\n        console.error(msg);\n      }\n      warned = true;\n    }\n    return fn.apply(this, arguments);\n  }\n\n  return deprecated;\n};\n\n\nvar debugs = {};\nvar debugEnviron;\nexports.debuglog = function(set) {\n  if (isUndefined(debugEnviron))\n    debugEnviron = process.env.NODE_DEBUG || '';\n  set = set.toUpperCase();\n  if (!debugs[set]) {\n    if (new RegExp('\\\\b' + set + '\\\\b', 'i').test(debugEnviron)) {\n      var pid = process.pid;\n      debugs[set] = function() {\n        var msg = exports.format.apply(exports, arguments);\n        console.error('%s %d: %s', set, pid, msg);\n      };\n    } else {\n      debugs[set] = function() {};\n    }\n  }\n  return debugs[set];\n};\n\n\n/**\n * Echos the value of a value. Trys to print the value out\n * in the best way possible given the different types.\n *\n * @param {Object} obj The object to print out.\n * @param {Object} opts Optional options object that alters the output.\n */\n/* legacy: obj, showHidden, depth, colors*/\nfunction inspect(obj, opts) {\n  // default options\n  var ctx = {\n    seen: [],\n    stylize: stylizeNoColor\n  };\n  // legacy...\n  if (arguments.length >= 3) ctx.depth = arguments[2];\n  if (arguments.length >= 4) ctx.colors = arguments[3];\n  if (isBoolean(opts)) {\n    // legacy...\n    ctx.showHidden = opts;\n  } else if (opts) {\n    // got an \"options\" object\n    exports._extend(ctx, opts);\n  }\n  // set default options\n  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;\n  if (isUndefined(ctx.depth)) ctx.depth = 2;\n  if (isUndefined(ctx.colors)) ctx.colors = false;\n  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;\n  if (ctx.colors) ctx.stylize = stylizeWithColor;\n  return formatValue(ctx, obj, ctx.depth);\n}\nexports.inspect = inspect;\n\n\n// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics\ninspect.colors = {\n  'bold' : [1, 22],\n  'italic' : [3, 23],\n  'underline' : [4, 24],\n  'inverse' : [7, 27],\n  'white' : [37, 39],\n  'grey' : [90, 39],\n  'black' : [30, 39],\n  'blue' : [34, 39],\n  'cyan' : [36, 39],\n  'green' : [32, 39],\n  'magenta' : [35, 39],\n  'red' : [31, 39],\n  'yellow' : [33, 39]\n};\n\n// Don't use 'blue' not visible on cmd.exe\ninspect.styles = {\n  'special': 'cyan',\n  'number': 'yellow',\n  'boolean': 'yellow',\n  'undefined': 'grey',\n  'null': 'bold',\n  'string': 'green',\n  'date': 'magenta',\n  // \"name\": intentionally not styling\n  'regexp': 'red'\n};\n\n\nfunction stylizeWithColor(str, styleType) {\n  var style = inspect.styles[styleType];\n\n  if (style) {\n    return '\\u001b[' + inspect.colors[style][0] + 'm' + str +\n           '\\u001b[' + inspect.colors[style][1] + 'm';\n  } else {\n    return str;\n  }\n}\n\n\nfunction stylizeNoColor(str, styleType) {\n  return str;\n}\n\n\nfunction arrayToHash(array) {\n  var hash = {};\n\n  array.forEach(function(val, idx) {\n    hash[val] = true;\n  });\n\n  return hash;\n}\n\n\nfunction formatValue(ctx, value, recurseTimes) {\n  // Provide a hook for user-specified inspect functions.\n  // Check that value is an object with an inspect function on it\n  if (ctx.customInspect &&\n      value &&\n      isFunction(value.inspect) &&\n      // Filter out the util module, it's inspect function is special\n      value.inspect !== exports.inspect &&\n      // Also filter out any prototype objects using the circular check.\n      !(value.constructor && value.constructor.prototype === value)) {\n    var ret = value.inspect(recurseTimes, ctx);\n    if (!isString(ret)) {\n      ret = formatValue(ctx, ret, recurseTimes);\n    }\n    return ret;\n  }\n\n  // Primitive types cannot have properties\n  var primitive = formatPrimitive(ctx, value);\n  if (primitive) {\n    return primitive;\n  }\n\n  // Look up the keys of the object.\n  var keys = Object.keys(value);\n  var visibleKeys = arrayToHash(keys);\n\n  if (ctx.showHidden) {\n    keys = Object.getOwnPropertyNames(value);\n  }\n\n  // IE doesn't make error fields non-enumerable\n  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx\n  if (isError(value)\n      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {\n    return formatError(value);\n  }\n\n  // Some type of object without properties can be shortcutted.\n  if (keys.length === 0) {\n    if (isFunction(value)) {\n      var name = value.name ? ': ' + value.name : '';\n      return ctx.stylize('[Function' + name + ']', 'special');\n    }\n    if (isRegExp(value)) {\n      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');\n    }\n    if (isDate(value)) {\n      return ctx.stylize(Date.prototype.toString.call(value), 'date');\n    }\n    if (isError(value)) {\n      return formatError(value);\n    }\n  }\n\n  var base = '', array = false, braces = ['{', '}'];\n\n  // Make Array say that they are Array\n  if (isArray(value)) {\n    array = true;\n    braces = ['[', ']'];\n  }\n\n  // Make functions say that they are functions\n  if (isFunction(value)) {\n    var n = value.name ? ': ' + value.name : '';\n    base = ' [Function' + n + ']';\n  }\n\n  // Make RegExps say that they are RegExps\n  if (isRegExp(value)) {\n    base = ' ' + RegExp.prototype.toString.call(value);\n  }\n\n  // Make dates with properties first say the date\n  if (isDate(value)) {\n    base = ' ' + Date.prototype.toUTCString.call(value);\n  }\n\n  // Make error with message first say the error\n  if (isError(value)) {\n    base = ' ' + formatError(value);\n  }\n\n  if (keys.length === 0 && (!array || value.length == 0)) {\n    return braces[0] + base + braces[1];\n  }\n\n  if (recurseTimes < 0) {\n    if (isRegExp(value)) {\n      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');\n    } else {\n      return ctx.stylize('[Object]', 'special');\n    }\n  }\n\n  ctx.seen.push(value);\n\n  var output;\n  if (array) {\n    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);\n  } else {\n    output = keys.map(function(key) {\n      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);\n    });\n  }\n\n  ctx.seen.pop();\n\n  return reduceToSingleString(output, base, braces);\n}\n\n\nfunction formatPrimitive(ctx, value) {\n  if (isUndefined(value))\n    return ctx.stylize('undefined', 'undefined');\n  if (isString(value)) {\n    var simple = '\\'' + JSON.stringify(value).replace(/^\"|\"$/g, '')\n                                             .replace(/'/g, \"\\\\'\")\n                                             .replace(/\\\\\"/g, '\"') + '\\'';\n    return ctx.stylize(simple, 'string');\n  }\n  if (isNumber(value))\n    return ctx.stylize('' + value, 'number');\n  if (isBoolean(value))\n    return ctx.stylize('' + value, 'boolean');\n  // For some reason typeof null is \"object\", so special case here.\n  if (isNull(value))\n    return ctx.stylize('null', 'null');\n}\n\n\nfunction formatError(value) {\n  return '[' + Error.prototype.toString.call(value) + ']';\n}\n\n\nfunction formatArray(ctx, value, recurseTimes, visibleKeys, keys) {\n  var output = [];\n  for (var i = 0, l = value.length; i < l; ++i) {\n    if (hasOwnProperty(value, String(i))) {\n      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,\n          String(i), true));\n    } else {\n      output.push('');\n    }\n  }\n  keys.forEach(function(key) {\n    if (!key.match(/^\\d+$/)) {\n      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,\n          key, true));\n    }\n  });\n  return output;\n}\n\n\nfunction formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {\n  var name, str, desc;\n  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };\n  if (desc.get) {\n    if (desc.set) {\n      str = ctx.stylize('[Getter/Setter]', 'special');\n    } else {\n      str = ctx.stylize('[Getter]', 'special');\n    }\n  } else {\n    if (desc.set) {\n      str = ctx.stylize('[Setter]', 'special');\n    }\n  }\n  if (!hasOwnProperty(visibleKeys, key)) {\n    name = '[' + key + ']';\n  }\n  if (!str) {\n    if (ctx.seen.indexOf(desc.value) < 0) {\n      if (isNull(recurseTimes)) {\n        str = formatValue(ctx, desc.value, null);\n      } else {\n        str = formatValue(ctx, desc.value, recurseTimes - 1);\n      }\n      if (str.indexOf('\\n') > -1) {\n        if (array) {\n          str = str.split('\\n').map(function(line) {\n            return '  ' + line;\n          }).join('\\n').substr(2);\n        } else {\n          str = '\\n' + str.split('\\n').map(function(line) {\n            return '   ' + line;\n          }).join('\\n');\n        }\n      }\n    } else {\n      str = ctx.stylize('[Circular]', 'special');\n    }\n  }\n  if (isUndefined(name)) {\n    if (array && key.match(/^\\d+$/)) {\n      return str;\n    }\n    name = JSON.stringify('' + key);\n    if (name.match(/^\"([a-zA-Z_][a-zA-Z_0-9]*)\"$/)) {\n      name = name.substr(1, name.length - 2);\n      name = ctx.stylize(name, 'name');\n    } else {\n      name = name.replace(/'/g, \"\\\\'\")\n                 .replace(/\\\\\"/g, '\"')\n                 .replace(/(^\"|\"$)/g, \"'\");\n      name = ctx.stylize(name, 'string');\n    }\n  }\n\n  return name + ': ' + str;\n}\n\n\nfunction reduceToSingleString(output, base, braces) {\n  var numLinesEst = 0;\n  var length = output.reduce(function(prev, cur) {\n    numLinesEst++;\n    if (cur.indexOf('\\n') >= 0) numLinesEst++;\n    return prev + cur.replace(/\\u001b\\[\\d\\d?m/g, '').length + 1;\n  }, 0);\n\n  if (length > 60) {\n    return braces[0] +\n           (base === '' ? '' : base + '\\n ') +\n           ' ' +\n           output.join(',\\n  ') +\n           ' ' +\n           braces[1];\n  }\n\n  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];\n}\n\n\n// NOTE: These type checking functions intentionally don't use `instanceof`\n// because it is fragile and can be easily faked with `Object.create()`.\nfunction isArray(ar) {\n  return Array.isArray(ar);\n}\nexports.isArray = isArray;\n\nfunction isBoolean(arg) {\n  return typeof arg === 'boolean';\n}\nexports.isBoolean = isBoolean;\n\nfunction isNull(arg) {\n  return arg === null;\n}\nexports.isNull = isNull;\n\nfunction isNullOrUndefined(arg) {\n  return arg == null;\n}\nexports.isNullOrUndefined = isNullOrUndefined;\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\nexports.isNumber = isNumber;\n\nfunction isString(arg) {\n  return typeof arg === 'string';\n}\nexports.isString = isString;\n\nfunction isSymbol(arg) {\n  return typeof arg === 'symbol';\n}\nexports.isSymbol = isSymbol;\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\nexports.isUndefined = isUndefined;\n\nfunction isRegExp(re) {\n  return isObject(re) && objectToString(re) === '[object RegExp]';\n}\nexports.isRegExp = isRegExp;\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\nexports.isObject = isObject;\n\nfunction isDate(d) {\n  return isObject(d) && objectToString(d) === '[object Date]';\n}\nexports.isDate = isDate;\n\nfunction isError(e) {\n  return isObject(e) &&\n      (objectToString(e) === '[object Error]' || e instanceof Error);\n}\nexports.isError = isError;\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\nexports.isFunction = isFunction;\n\nfunction isPrimitive(arg) {\n  return arg === null ||\n         typeof arg === 'boolean' ||\n         typeof arg === 'number' ||\n         typeof arg === 'string' ||\n         typeof arg === 'symbol' ||  // ES6 symbol\n         typeof arg === 'undefined';\n}\nexports.isPrimitive = isPrimitive;\n\nexports.isBuffer = require('./support/isBuffer');\n\nfunction objectToString(o) {\n  return Object.prototype.toString.call(o);\n}\n\n\nfunction pad(n) {\n  return n < 10 ? '0' + n.toString(10) : n.toString(10);\n}\n\n\nvar months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',\n              'Oct', 'Nov', 'Dec'];\n\n// 26 Feb 16:19:34\nfunction timestamp() {\n  var d = new Date();\n  var time = [pad(d.getHours()),\n              pad(d.getMinutes()),\n              pad(d.getSeconds())].join(':');\n  return [d.getDate(), months[d.getMonth()], time].join(' ');\n}\n\n\n// log is just a thin wrapper to console.log that prepends a timestamp\nexports.log = function() {\n  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));\n};\n\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * The Function.prototype.inherits from lang.js rewritten as a standalone\n * function (not on Function.prototype). NOTE: If this file is to be loaded\n * during bootstrapping this function needs to be rewritten using some native\n * functions as prototype setup using normal JavaScript does not work as\n * expected during bootstrapping (see mirror.js in r114903).\n *\n * @param {function} ctor Constructor function which needs to inherit the\n *     prototype.\n * @param {function} superCtor Constructor function to inherit prototype from.\n */\nexports.inherits = require('inherits');\n\nexports._extend = function(origin, add) {\n  // Don't do anything if add isn't an object\n  if (!add || !isObject(add)) return origin;\n\n  var keys = Object.keys(add);\n  var i = keys.length;\n  while (i--) {\n    origin[keys[i]] = add[keys[i]];\n  }\n  return origin;\n};\n\nfunction hasOwnProperty(obj, prop) {\n  return Object.prototype.hasOwnProperty.call(obj, prop);\n}\n",
     "module.exports.VectorTile = require('./lib/vectortile.js');\nmodule.exports.VectorTileFeature = require('./lib/vectortilefeature.js');\nmodule.exports.VectorTileLayer = require('./lib/vectortilelayer.js');\n",
     "'use strict';\n\nvar VectorTileLayer = require('./vectortilelayer');\n\nmodule.exports = VectorTile;\n\nfunction VectorTile(pbf, end) {\n    this.layers = pbf.readFields(readTile, {}, end);\n}\n\nfunction readTile(tag, layers, pbf) {\n    if (tag === 3) {\n        var layer = new VectorTileLayer(pbf, pbf.readVarint() + pbf.pos);\n        if (layer.length) layers[layer.name] = layer;\n    }\n}\n\n",
     "'use strict';\n\nvar Point = require('point-geometry');\n\nmodule.exports = VectorTileFeature;\n\nfunction VectorTileFeature(pbf, end, extent, keys, values) {\n    // Public\n    this.properties = {};\n    this.extent = extent;\n    this.type = 0;\n\n    // Private\n    this._pbf = pbf;\n    this._geometry = -1;\n    this._keys = keys;\n    this._values = values;\n\n    pbf.readFields(readFeature, this, end);\n}\n\nfunction readFeature(tag, feature, pbf) {\n    if (tag == 1) feature.id = pbf.readVarint();\n    else if (tag == 2) readTag(pbf, feature);\n    else if (tag == 3) feature.type = pbf.readVarint();\n    else if (tag == 4) feature._geometry = pbf.pos;\n}\n\nfunction readTag(pbf, feature) {\n    var end = pbf.readVarint() + pbf.pos;\n\n    while (pbf.pos < end) {\n        var key = feature._keys[pbf.readVarint()],\n            value = feature._values[pbf.readVarint()];\n        feature.properties[key] = value;\n    }\n}\n\nVectorTileFeature.types = ['Unknown', 'Point', 'LineString', 'Polygon'];\n\nVectorTileFeature.prototype.loadGeometry = function() {\n    var pbf = this._pbf;\n    pbf.pos = this._geometry;\n\n    var end = pbf.readVarint() + pbf.pos,\n        cmd = 1,\n        length = 0,\n        x = 0,\n        y = 0,\n        lines = [],\n        line;\n\n    while (pbf.pos < end) {\n        if (!length) {\n            var cmdLen = pbf.readVarint();\n            cmd = cmdLen & 0x7;\n            length = cmdLen >> 3;\n        }\n\n        length--;\n\n        if (cmd === 1 || cmd === 2) {\n            x += pbf.readSVarint();\n            y += pbf.readSVarint();\n\n            if (cmd === 1) { // moveTo\n                if (line) lines.push(line);\n                line = [];\n            }\n\n            line.push(new Point(x, y));\n\n        } else if (cmd === 7) {\n\n            // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90\n            if (line) {\n                line.push(line[0].clone()); // closePolygon\n            }\n\n        } else {\n            throw new Error('unknown command ' + cmd);\n        }\n    }\n\n    if (line) lines.push(line);\n\n    return lines;\n};\n\nVectorTileFeature.prototype.bbox = function() {\n    var pbf = this._pbf;\n    pbf.pos = this._geometry;\n\n    var end = pbf.readVarint() + pbf.pos,\n        cmd = 1,\n        length = 0,\n        x = 0,\n        y = 0,\n        x1 = Infinity,\n        x2 = -Infinity,\n        y1 = Infinity,\n        y2 = -Infinity;\n\n    while (pbf.pos < end) {\n        if (!length) {\n            var cmdLen = pbf.readVarint();\n            cmd = cmdLen & 0x7;\n            length = cmdLen >> 3;\n        }\n\n        length--;\n\n        if (cmd === 1 || cmd === 2) {\n            x += pbf.readSVarint();\n            y += pbf.readSVarint();\n            if (x < x1) x1 = x;\n            if (x > x2) x2 = x;\n            if (y < y1) y1 = y;\n            if (y > y2) y2 = y;\n\n        } else if (cmd !== 7) {\n            throw new Error('unknown command ' + cmd);\n        }\n    }\n\n    return [x1, y1, x2, y2];\n};\n\nVectorTileFeature.prototype.toGeoJSON = function(x, y, z) {\n    var size = this.extent * Math.pow(2, z),\n        x0 = this.extent * x,\n        y0 = this.extent * y,\n        coords = this.loadGeometry(),\n        type = VectorTileFeature.types[this.type],\n        i, j;\n\n    function project(line) {\n        for (var j = 0; j < line.length; j++) {\n            var p = line[j], y2 = 180 - (p.y + y0) * 360 / size;\n            line[j] = [\n                (p.x + x0) * 360 / size - 180,\n                360 / Math.PI * Math.atan(Math.exp(y2 * Math.PI / 180)) - 90\n            ];\n        }\n    }\n\n    switch (this.type) {\n    case 1:\n        var points = [];\n        for (i = 0; i < coords.length; i++) {\n            points[i] = coords[i][0];\n        }\n        coords = points;\n        project(coords);\n        break;\n\n    case 2:\n        for (i = 0; i < coords.length; i++) {\n            project(coords[i]);\n        }\n        break;\n\n    case 3:\n        coords = classifyRings(coords);\n        for (i = 0; i < coords.length; i++) {\n            for (j = 0; j < coords[i].length; j++) {\n                project(coords[i][j]);\n            }\n        }\n        break;\n    }\n\n    if (coords.length === 1) {\n        coords = coords[0];\n    } else {\n        type = 'Multi' + type;\n    }\n\n    var result = {\n        type: \"Feature\",\n        geometry: {\n            type: type,\n            coordinates: coords\n        },\n        properties: this.properties\n    };\n\n    if ('id' in this) {\n        result.id = this.id;\n    }\n\n    return result;\n};\n\n// classifies an array of rings into polygons with outer rings and holes\n\nfunction classifyRings(rings) {\n    var len = rings.length;\n\n    if (len <= 1) return [rings];\n\n    var polygons = [],\n        polygon,\n        ccw;\n\n    for (var i = 0; i < len; i++) {\n        var area = signedArea(rings[i]);\n        if (area === 0) continue;\n\n        if (ccw === undefined) ccw = area < 0;\n\n        if (ccw === area < 0) {\n            if (polygon) polygons.push(polygon);\n            polygon = [rings[i]];\n\n        } else {\n            polygon.push(rings[i]);\n        }\n    }\n    if (polygon) polygons.push(polygon);\n\n    return polygons;\n}\n\nfunction signedArea(ring) {\n    var sum = 0;\n    for (var i = 0, len = ring.length, j = len - 1, p1, p2; i < len; j = i++) {\n        p1 = ring[i];\n        p2 = ring[j];\n        sum += (p2.x - p1.x) * (p1.y + p2.y);\n    }\n    return sum;\n}\n",
     "'use strict';\n\nvar VectorTileFeature = require('./vectortilefeature.js');\n\nmodule.exports = VectorTileLayer;\n\nfunction VectorTileLayer(pbf, end) {\n    // Public\n    this.version = 1;\n    this.name = null;\n    this.extent = 4096;\n    this.length = 0;\n\n    // Private\n    this._pbf = pbf;\n    this._keys = [];\n    this._values = [];\n    this._features = [];\n\n    pbf.readFields(readLayer, this, end);\n\n    this.length = this._features.length;\n}\n\nfunction readLayer(tag, layer, pbf) {\n    if (tag === 15) layer.version = pbf.readVarint();\n    else if (tag === 1) layer.name = pbf.readString();\n    else if (tag === 5) layer.extent = pbf.readVarint();\n    else if (tag === 2) layer._features.push(pbf.pos);\n    else if (tag === 3) layer._keys.push(pbf.readString());\n    else if (tag === 4) layer._values.push(readValueMessage(pbf));\n}\n\nfunction readValueMessage(pbf) {\n    var value = null,\n        end = pbf.readVarint() + pbf.pos;\n\n    while (pbf.pos < end) {\n        var tag = pbf.readVarint() >> 3;\n\n        value = tag === 1 ? pbf.readString() :\n            tag === 2 ? pbf.readFloat() :\n            tag === 3 ? pbf.readDouble() :\n            tag === 4 ? pbf.readVarint64() :\n            tag === 5 ? pbf.readVarint() :\n            tag === 6 ? pbf.readSVarint() :\n            tag === 7 ? pbf.readBoolean() : null;\n    }\n\n    return value;\n}\n\n// return feature `i` from this layer as a `VectorTileFeature`\nVectorTileLayer.prototype.feature = function(i) {\n    if (i < 0 || i >= this._features.length) throw new Error('feature index out of bounds');\n\n    this._pbf.pos = this._features[i];\n\n    var end = this._pbf.readVarint() + this._pbf.pos;\n    return new VectorTileFeature(this._pbf, end, this.extent, this._keys, this._values);\n};\n",
-    "'use strict';\n\nmodule.exports = Point;\n\nfunction Point(x, y) {\n    this.x = x;\n    this.y = y;\n}\n\nPoint.prototype = {\n    clone: function() { return new Point(this.x, this.y); },\n\n    add:     function(p) { return this.clone()._add(p);     },\n    sub:     function(p) { return this.clone()._sub(p);     },\n    mult:    function(k) { return this.clone()._mult(k);    },\n    div:     function(k) { return this.clone()._div(k);     },\n    rotate:  function(a) { return this.clone()._rotate(a);  },\n    matMult: function(m) { return this.clone()._matMult(m); },\n    unit:    function() { return this.clone()._unit(); },\n    perp:    function() { return this.clone()._perp(); },\n    round:   function() { return this.clone()._round(); },\n\n    mag: function() {\n        return Math.sqrt(this.x * this.x + this.y * this.y);\n    },\n\n    equals: function(p) {\n        return this.x === p.x &&\n               this.y === p.y;\n    },\n\n    dist: function(p) {\n        return Math.sqrt(this.distSqr(p));\n    },\n\n    distSqr: function(p) {\n        var dx = p.x - this.x,\n            dy = p.y - this.y;\n        return dx * dx + dy * dy;\n    },\n\n    angle: function() {\n        return Math.atan2(this.y, this.x);\n    },\n\n    angleTo: function(b) {\n        return Math.atan2(this.y - b.y, this.x - b.x);\n    },\n\n    angleWith: function(b) {\n        return this.angleWithSep(b.x, b.y);\n    },\n\n    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.\n    angleWithSep: function(x, y) {\n        return Math.atan2(\n            this.x * y - this.y * x,\n            this.x * x + this.y * y);\n    },\n\n    _matMult: function(m) {\n        var x = m[0] * this.x + m[1] * this.y,\n            y = m[2] * this.x + m[3] * this.y;\n        this.x = x;\n        this.y = y;\n        return this;\n    },\n\n    _add: function(p) {\n        this.x += p.x;\n        this.y += p.y;\n        return this;\n    },\n\n    _sub: function(p) {\n        this.x -= p.x;\n        this.y -= p.y;\n        return this;\n    },\n\n    _mult: function(k) {\n        this.x *= k;\n        this.y *= k;\n        return this;\n    },\n\n    _div: function(k) {\n        this.x /= k;\n        this.y /= k;\n        return this;\n    },\n\n    _unit: function() {\n        this._div(this.mag());\n        return this;\n    },\n\n    _perp: function() {\n        var y = this.y;\n        this.y = this.x;\n        this.x = -y;\n        return this;\n    },\n\n    _rotate: function(angle) {\n        var cos = Math.cos(angle),\n            sin = Math.sin(angle),\n            x = cos * this.x - sin * this.y,\n            y = sin * this.x + cos * this.y;\n        this.x = x;\n        this.y = y;\n        return this;\n    },\n\n    _round: function() {\n        this.x = Math.round(this.x);\n        this.y = Math.round(this.y);\n        return this;\n    }\n};\n\n// constructs Point from an array if necessary\nPoint.convert = function (a) {\n    if (a instanceof Point) {\n        return a;\n    }\n    if (Array.isArray(a)) {\n        return new Point(a[0], a[1]);\n    }\n    return a;\n};\n",
     "// Geometry building functions\nimport Geo from '../geo';\n\nexport const tile_bounds = [\n    { x: 0, y: 0},\n    { x: Geo.tile_scale, y: -Geo.tile_scale } // TODO: correct for flipped y-axis?\n];\n\nexport const default_uvs = [0, 0, 1, 1];\n\n// Tests if a line segment (from point A to B) is outside the tile bounds\n// (within a certain tolerance to account for geometry nearly on tile edges)\nexport function outsideTile (_a, _b, tolerance) {\n    let tile_min = tile_bounds[0];\n    let tile_max = tile_bounds[1];\n\n    // TODO: fix flipped Y coords here, confusing with 'max' reference\n    if ((_a[0] <= tile_min.x + tolerance && _b[0] <= tile_min.x + tolerance) ||\n        (_a[0] >= tile_max.x - tolerance && _b[0] >= tile_max.x - tolerance) ||\n        (_a[1] >= tile_min.y - tolerance && _b[1] >= tile_min.y - tolerance) ||\n        (_a[1] <= tile_max.y + tolerance && _b[1] <= tile_max.y + tolerance)) {\n        return true;\n    }\n\n    return false;\n}\n\nexport function isCoordOutsideTile (coord, tolerance) {\n    tolerance = tolerance || 0;\n    let tile_min = tile_bounds[0];\n    let tile_max = tile_bounds[1];\n\n    return coord[0] <= tile_min.x + tolerance ||\n           coord[0] >= tile_max.x - tolerance ||\n           coord[1] >= tile_min.y - tolerance ||\n           coord[1] <= tile_max.y + tolerance;\n}\n",
     "// Point builders\nimport { default_uvs } from './common';\n\n// Build a billboard sprite quad centered on a point. Sprites are intended to be drawn in screenspace, and have\n// properties for width, height, angle, and a scale factor that can be used to interpolate the screenspace size\n// of a sprite between two zoom levels.\nexport function buildQuadsForPoints (points, vertex_data, vertex_template,\n    { texcoord_index, position_index, shape_index, offset_index, offsets_index, pre_angles_index, angles_index },\n    { quad, quad_normalize, offset, offsets, pre_angles, angle, angles, shape_w, curve, texcoord_scale, texcoord_normalize, pre_angles_normalize, angles_normalize, offsets_normalize }) {\n    quad_normalize = quad_normalize || 1;\n    let w2 = quad[0] / 2 * quad_normalize;\n    let h2 = quad[1] / 2 * quad_normalize;\n    let scaling = [\n        [-w2, -h2],\n        [w2, -h2],\n        [w2, h2],\n        [-w2, h2]\n    ];\n\n    let vertex_elements = vertex_data.vertex_elements;\n    let element_offset = vertex_data.vertex_count;\n\n    let texcoords;\n    if (texcoord_index) {\n        texcoord_normalize = texcoord_normalize || 1;\n\n        var [min_u, min_v, max_u, max_v] = texcoord_scale || default_uvs;\n\n        texcoords = [\n            [min_u, min_v],\n            [max_u, min_v],\n            [max_u, max_v],\n            [min_u, max_v]\n        ];\n    }\n\n    let num_points = points.length;\n    for (let p=0; p < num_points; p++) {\n        let point = points[p];\n\n        for (let pos=0; pos < 4; pos++) {\n            // Add texcoords\n            if (texcoord_index) {\n                vertex_template[texcoord_index + 0] = texcoords[pos][0] * texcoord_normalize;\n                vertex_template[texcoord_index + 1] = texcoords[pos][1] * texcoord_normalize;\n            }\n\n            vertex_template[position_index + 0] = point[0];\n            vertex_template[position_index + 1] = point[1];\n\n            vertex_template[shape_index + 0] = scaling[pos][0];\n            vertex_template[shape_index + 1] = scaling[pos][1];\n            vertex_template[shape_index + 2] = angle;\n            vertex_template[shape_index + 3] = shape_w;\n\n            vertex_template[offset_index + 0] = offset[0];\n            vertex_template[offset_index + 1] = offset[1];\n\n            if (curve){\n                // 1 byte (signed) range: [-127, 128]\n                // actual range: [-2pi, 2pi]\n                // total: multiply by 128 / (2 PI)\n                vertex_template[pre_angles_index + 0] = pre_angles_normalize * pre_angles[0];\n                vertex_template[pre_angles_index + 1] = pre_angles_normalize * pre_angles[1];\n                vertex_template[pre_angles_index + 2] = pre_angles_normalize * pre_angles[2];\n                vertex_template[pre_angles_index + 3] = pre_angles_normalize * pre_angles[3];\n\n                // 2 byte (signed) of resolution [-32767, 32768]\n                // actual range: [-2pi, 2pi]\n                // total: multiply by 32768 / (2 PI) = 16384 / PI\n                vertex_template[angles_index + 0] = angles_normalize * angles[0];\n                vertex_template[angles_index + 1] = angles_normalize * angles[1];\n                vertex_template[angles_index + 2] = angles_normalize * angles[2];\n                vertex_template[angles_index + 3] = angles_normalize * angles[3];\n\n                // offset range can be [0, 65535]\n                // actual range: [0, 1024]\n                vertex_template[offsets_index + 0] = offsets_normalize * offsets[0];\n                vertex_template[offsets_index + 1] = offsets_normalize * offsets[1];\n                vertex_template[offsets_index + 2] = offsets_normalize * offsets[2];\n                vertex_template[offsets_index + 3] = offsets_normalize * offsets[3];\n            }\n\n            vertex_data.addVertex(vertex_template);\n        }\n\n        vertex_elements.push(element_offset + 0);\n        vertex_elements.push(element_offset + 1);\n        vertex_elements.push(element_offset + 2);\n        vertex_elements.push(element_offset + 2);\n        vertex_elements.push(element_offset + 3);\n        vertex_elements.push(element_offset + 0);\n\n        element_offset += 4;\n    }\n}\n",
     "// Polygon builders\nimport Geo from '../geo';\nimport Vector from '../vector';\nimport { default_uvs, outsideTile } from './common';\n\nimport earcut from 'earcut';\n\nconst up_vec3 = [0, 0, 1];\n\n// Tesselate a flat 2D polygon\n// x & y coordinates will be set as first two elements of provided vertex_template\nexport function buildPolygons (\n    polygons,\n    vertex_data, vertex_template,\n    { texcoord_index, texcoord_scale, texcoord_normalize }) {\n\n    var vertex_elements = vertex_data.vertex_elements;\n\n    if (texcoord_index) {\n        texcoord_normalize = texcoord_normalize || 1;\n        var [min_u, min_v, max_u, max_v] = texcoord_scale || default_uvs;\n    }\n\n    var num_polygons = polygons.length;\n    for (var p=0; p < num_polygons; p++) {\n        var element_offset = vertex_data.vertex_count;\n\n        var polygon = polygons[p];\n\n        // Find polygon extents to calculate UVs, fit them to the axis-aligned bounding box\n        if (texcoord_index) {\n            var [min_x, min_y, max_x, max_y] = Geo.findBoundingBox(polygon);\n            var span_x = max_x - min_x;\n            var span_y = max_y - min_y;\n            var scale_u = (max_u - min_u) / span_x;\n            var scale_v = (max_v - min_v) / span_y;\n        }\n\n        for (var ring_index = 0; ring_index < polygon.length; ring_index++){\n            // Add vertex data\n            var polygon_ring = polygon[ring_index];\n            for (let i = 0; i < polygon_ring.length; i++) {\n                var vertex = polygon_ring[i];\n                vertex_template[0] = vertex[0];\n                vertex_template[1] = vertex[1];\n\n                // Add UVs\n                if (texcoord_index) {\n                    vertex_template[texcoord_index + 0] = ((vertex[0] - min_x) * scale_u + min_u) * texcoord_normalize;\n                    vertex_template[texcoord_index + 1] = ((vertex[1] - min_y) * scale_v + min_v) * texcoord_normalize;\n                }\n\n                vertex_data.addVertex(vertex_template);\n            }\n        }\n\n        // Add element indices\n        var indices = triangulatePolygon(earcut.flatten(polygon));\n        for (let i = 0; i < indices.length; i++){\n            vertex_elements.push(element_offset + indices[i]);\n        }\n    }\n}\n\n// Tesselate and extrude a flat 2D polygon into a simple 3D model with fixed height and add to GL vertex buffer\nexport function buildExtrudedPolygons (\n    polygons,\n    z, height, min_height,\n    vertex_data, vertex_template,\n    normal_index,\n    normal_normalize,\n    {\n        remove_tile_edges,\n        tile_edge_tolerance,\n        texcoord_index,\n        texcoord_scale,\n        texcoord_normalize,\n        winding\n    }) {\n\n    // Top\n    var min_z = z + (min_height || 0);\n    var max_z = z + height;\n    vertex_template[2] = max_z;\n    buildPolygons(polygons, vertex_data, vertex_template, { texcoord_index, texcoord_scale, texcoord_normalize });\n\n    var vertex_elements = vertex_data.vertex_elements;\n    var element_offset = vertex_data.vertex_count;\n\n    // Walls\n    // Fit UVs to wall quad\n    if (texcoord_index) {\n        texcoord_normalize = texcoord_normalize || 1;\n        var [min_u, min_v, max_u, max_v] = texcoord_scale || default_uvs;\n        var texcoords = [\n            [min_u, max_v],\n            [min_u, min_v],\n            [max_u, min_v],\n            [max_u, max_v]\n        ];\n    }\n\n    var num_polygons = polygons.length;\n    for (var p=0; p < num_polygons; p++) {\n        var polygon = polygons[p];\n\n        for (var q=0; q < polygon.length; q++) {\n            var contour = polygon[q];\n\n            for (var w=0; w < contour.length - 1; w++) {\n                if (remove_tile_edges && outsideTile(contour[w], contour[w+1], tile_edge_tolerance)) {\n                    continue; // don't extrude tile edges\n                }\n\n                // Wall order is dependent on winding order, so that normals face outward\n                let w0, w1;\n                if (winding === 'CCW') {\n                    w0 = w;\n                    w1 = w+1;\n                }\n                else {\n                    w0 = w+1;\n                    w1 = w;\n                }\n\n                // Two triangles for the quad formed by each vertex pair, going from bottom to top height\n                var wall_vertices = [\n                    [contour[w1][0], contour[w1][1], max_z],\n                    [contour[w1][0], contour[w1][1], min_z],\n                    [contour[w0][0], contour[w0][1], min_z],\n                    [contour[w0][0], contour[w0][1], max_z]\n                ];\n\n                // Calc the normal of the wall from up vector and one segment of the wall triangles\n                let wall_vec = Vector.normalize([contour[w1][0] - contour[w0][0], contour[w1][1] - contour[w0][1], 0]);\n                let normal = Vector.cross(up_vec3, wall_vec);\n\n                // Update vertex template with current surface normal\n                vertex_template[normal_index + 0] = normal[0] * normal_normalize;\n                vertex_template[normal_index + 1] = normal[1] * normal_normalize;\n                vertex_template[normal_index + 2] = normal[2] * normal_normalize;\n\n                for (var wv=0; wv < wall_vertices.length; wv++) {\n                    vertex_template[0] = wall_vertices[wv][0];\n                    vertex_template[1] = wall_vertices[wv][1];\n                    vertex_template[2] = wall_vertices[wv][2];\n\n                    if (texcoord_index) {\n                        vertex_template[texcoord_index + 0] = texcoords[wv][0] * texcoord_normalize;\n                        vertex_template[texcoord_index + 1] = texcoords[wv][1] * texcoord_normalize;\n                    }\n\n                    vertex_data.addVertex(vertex_template);\n                }\n\n                vertex_elements.push(element_offset + 0);\n                vertex_elements.push(element_offset + 1);\n                vertex_elements.push(element_offset + 2);\n                vertex_elements.push(element_offset + 2);\n                vertex_elements.push(element_offset + 3);\n                vertex_elements.push(element_offset + 0);\n\n                element_offset += 4;\n            }\n        }\n    }\n}\n\n// Triangulation using earcut\n// https://github.com/mapbox/earcut\nexport function triangulatePolygon (data) {\n    return earcut(data.vertices, data.holes, data.dimensions);\n}\n",
     "// Geometry building functions\n\nimport Vector from '../vector';\nimport Geo from '../geo';\nimport {outsideTile, isCoordOutsideTile} from './common';\n\nconst zero_vec2 = [0, 0];\n\n// Build tessellated triangles for a polyline\nconst CAP_TYPE = {\n    butt: 0,\n    square: 1,\n    round: 2\n};\n\nconst JOIN_TYPE = {\n    miter: 0,\n    bevel: 1,\n    round: 2\n};\n\nconst DEFAULT = {\n    MITER_LIMIT: 3,\n    TEXCOORD_NORMALIZE: 1,\n    TEXCOORD_RATIO: 1,\n    MIN_FAN_WIDTH: 5        // Width of line in tile units to place 1 triangle per fan\n};\n\n// Scaling factor to add precision to line texture V coordinate packed as normalized short\nconst v_scale_adjust = Geo.tile_scale;\n\nexport function buildPolylines (lines, width, vertex_data, vertex_template,\n    {\n        closed_polygon,\n        remove_tile_edges,\n        tile_edge_tolerance,\n        texcoord_index,\n        texcoord_scale,\n        texcoord_width,\n        texcoord_ratio,\n        texcoord_normalize,\n        scaling_index,\n        scaling_normalize,\n        join, cap,\n        miter_limit\n    }) {\n\n    var cap_type = cap ? CAP_TYPE[cap] : CAP_TYPE.butt;\n    var join_type = join ? JOIN_TYPE[join] : JOIN_TYPE.miter;\n\n    // Configure miter limit\n    if (join_type === JOIN_TYPE.miter) {\n        miter_limit = miter_limit || DEFAULT.MITER_LIMIT; // default miter limit\n        var miter_len_sq = miter_limit * miter_limit;\n    }\n\n    // Texture Variables\n    var v_scale;\n    if (texcoord_index) {\n        texcoord_normalize = texcoord_normalize || DEFAULT.TEXCOORD_NORMALIZE;\n        texcoord_ratio = texcoord_ratio || DEFAULT.TEXCOORD_RATIO;\n        v_scale = 1 / (texcoord_width * texcoord_ratio * v_scale_adjust); // scales line texture as a ratio of the line's width\n    }\n\n    // Values that are constant for each line and are passed to helper functions\n    var context = {\n        closed_polygon,\n        remove_tile_edges,\n        tile_edge_tolerance,\n        miter_len_sq,\n        join_type,\n        cap_type,\n        vertex_data,\n        vertex_template,\n        half_width: width / 2,\n        scaling_index,\n        scaling_normalize,\n        v_scale,\n        texcoord_index,\n        texcoord_width,\n        texcoord_normalize\n    };\n\n    // Buffer for extra lines to process\n    var extra_lines = [];\n\n    // Process lines\n    for (let index = 0; index < lines.length; index++) {\n        buildPolyline(lines[index], context, extra_lines);\n    }\n\n    // Process extra lines\n    for (let index = 0; index < extra_lines.length; index++) {\n        buildPolyline(extra_lines[index], context, extra_lines);\n    }\n}\n\nfunction buildPolyline(line, context, extra_lines){\n    // Skip if line is not valid\n    if (line.length < 2) {\n        return;\n    }\n\n    var {join_type, cap_type, closed_polygon, remove_tile_edges, tile_edge_tolerance, v_scale, miter_len_sq} = context;\n\n    // Loop backwards through line to a tile boundary if found\n    if (closed_polygon && join_type === JOIN_TYPE.miter) {\n        var boundaryIndex = getTileBoundaryIndex(line);\n        if (boundaryIndex !== 0) {\n            // create new line that is a cyclic permutation of the original\n            var permutedLine = permuteLine(line, boundaryIndex);\n            extra_lines.push(permutedLine);\n            return;\n        }\n    }\n\n    var coordCurr, coordNext, normPrev, normNext;\n    var v = 0; // Texture v-coordinate\n\n    var index_start = 0;\n    var index_end = line.length - 1;\n    var ignored_indices_count = 0;\n\n    // FIRST POINT\n    // loop through beginning points if duplicates\n    coordCurr = line[index_start];\n    coordNext = line[index_start + 1];\n    while (Vector.isEqual(coordCurr, coordNext)) {\n        index_start++;\n        coordCurr = coordNext;\n        coordNext = line[index_start + 1];\n        ignored_indices_count++;\n        if (index_start === line.length - 1) {\n            return;\n        }\n    }\n\n    // loop through ending points to check for duplicates\n    while (Vector.isEqual(line[index_end], line[index_end - 1])) {\n        index_end--;\n        ignored_indices_count++;\n        if (index_end === 0) {\n            return;\n        }\n    }\n\n    if (line.length < 2 + ignored_indices_count) {\n        return;\n    }\n\n    normNext = Vector.normalize(Vector.perp(coordCurr, coordNext));\n\n    // Skip tile boundary lines and append a new line if needed\n    if (remove_tile_edges && outsideTile(coordCurr, coordNext, tile_edge_tolerance)) {\n        var nonBoundarySegment = getNextNonBoundarySegment(line, index_start, tile_edge_tolerance);\n        if (nonBoundarySegment) {\n            extra_lines.push(nonBoundarySegment);\n        }\n        return;\n    }\n\n    if (closed_polygon){\n        // Begin the polygon with a join (connecting the first and last segments)\n        normPrev = Vector.normalize(Vector.perp(line[index_end - 1], coordCurr));\n        startPolygon(coordCurr, normPrev, normNext, join_type, context);\n    }\n    else {\n        // If line begins at edge, don't add a cap\n        if (!isCoordOutsideTile(coordCurr)) {\n            addCap(coordCurr, v, normNext, cap_type, true, context);\n            if (cap_type !== CAP_TYPE.butt) {\n                v += 0.5 * v_scale * context.texcoord_width;\n            }\n        }\n\n        // Add first pair of points for the line strip\n        addVertex(coordCurr, normNext, [1, v], context);\n        addVertex(coordCurr, Vector.neg(normNext), [0, v], context);\n    }\n\n    // INTERMEDIARY POINTS\n    v += v_scale * Vector.length(Vector.sub(coordNext, coordCurr));\n    for (var i = index_start + 1; i < index_end; i++) {\n        var currIndex = i;\n        var nextIndex = i + 1;\n        coordCurr = line[currIndex];\n        coordNext = line[nextIndex];\n\n        // Skip redundant vertices\n        if (Vector.isEqual(coordCurr, coordNext)) {\n            continue;\n        }\n\n        // Remove tile boundaries\n        if (remove_tile_edges && outsideTile(coordCurr, coordNext, tile_edge_tolerance)) {\n            addVertex(coordCurr, normNext, [1, v], context);\n            addVertex(coordCurr, Vector.neg(normNext), [0, v], context);\n            indexPairs(1, context);\n\n            var nonBoundaryLines = getNextNonBoundarySegment(line, currIndex + 1, tile_edge_tolerance);\n            if (nonBoundaryLines) {\n                extra_lines.push(nonBoundaryLines);\n            }\n            return;\n        }\n\n        normPrev = normNext;\n        normNext = Vector.normalize(Vector.perp(coordCurr, coordNext));\n\n        // Add join\n        if (join_type === JOIN_TYPE.miter) {\n            addMiter(v, coordCurr, normPrev, normNext, miter_len_sq, false, context);\n        }\n        else {\n            addJoin(join_type, v, coordCurr, normPrev, normNext, false, context);\n        }\n\n        v += v_scale * Vector.length(Vector.sub(coordNext, coordCurr));\n    }\n\n    // LAST POINT\n    coordCurr = coordNext;\n    normPrev = normNext;\n\n    if (closed_polygon) {\n        // Close the polygon with a miter joint or butt cap if on a tile boundary\n        normNext = Vector.normalize(Vector.perp(coordCurr, line[1]));\n        endPolygon(coordCurr, normPrev, normNext, join_type, v, context);\n    }\n    else {\n        // Finish the line strip\n        addVertex(coordCurr, normPrev, [1, v], context);\n        addVertex(coordCurr, Vector.neg(normPrev), [0, v], context);\n        indexPairs(1, context);\n\n        // If line ends at edge, don't add a cap\n        if (!isCoordOutsideTile(coordCurr)) {\n            addCap(coordCurr, v, normPrev, cap_type, false, context);\n        }\n    }\n}\n\nfunction getTileBoundaryIndex(line){\n    if (isCoordOutsideTile(line[0])) {\n        return 0;\n    }\n\n    for (var backIndex = 0; backIndex < line.length; backIndex++) {\n        var coordCurr = line[line.length - 1 - backIndex];\n        if (isCoordOutsideTile(coordCurr)) {\n            return line.length - 1 - backIndex;\n        }\n    }\n\n    return 0;\n}\n\n// Iterate through line from startIndex to find a segment not on a tile boundary, if any.\nfunction getNextNonBoundarySegment (line, startIndex, tolerance) {\n    var endIndex = startIndex;\n    while (line[endIndex + 1] && outsideTile(line[endIndex], line[endIndex + 1], tolerance)) {\n        endIndex++;\n    }\n\n    // If there is a line segment remaining that is within the tile, push it to the lines array\n    return (line.length - endIndex >= 2) ? line.slice(endIndex) : false;\n}\n\n// Begin a polygon with a join connecting to the last segment (if valid join-type specified)\nfunction startPolygon(coordCurr, normPrev, normNext, join_type, context){\n    // If polygon starts on a tile boundary, don't add a join\n    if (join_type === undefined || isCoordOutsideTile(coordCurr)) {\n        addVertex(coordCurr, normNext, [1, 0], context);\n        addVertex(coordCurr, Vector.neg(normNext), [0, 0], context);\n    }\n    else {\n        // If polygon starts within a tile, add a join\n        var v = 0;\n        if (join_type === JOIN_TYPE.miter) {\n            addMiter(v, coordCurr, normPrev, normNext, context.miter_len_sq, true, context);\n        }\n        else {\n            addJoin(join_type, v, coordCurr, normPrev, normNext, true, context);\n        }\n    }\n}\n\n// End a polygon appropriately\nfunction endPolygon(coordCurr, normPrev, normNext, join_type, v, context) {\n    // If polygon ends on a tile boundary, don't add a join\n    if (isCoordOutsideTile(coordCurr)) {\n        addVertex(coordCurr, normPrev, [1, v], context);\n        addVertex(coordCurr, Vector.neg(normPrev), [0, v], context);\n        indexPairs(1, context);\n    }\n    else {\n        // If polygon ends within a tile, add Miter or no joint (join added on startPolygon)\n        var miterVec = createMiterVec(normPrev, normNext);\n\n        if (join_type === JOIN_TYPE.miter && Vector.lengthSq(miterVec) > context.miter_len_sq) {\n            join_type = JOIN_TYPE.bevel; // switch to bevel\n        }\n\n        if (join_type === JOIN_TYPE.miter) {\n            addVertex(coordCurr, miterVec, [1, v], context);\n            addVertex(coordCurr, Vector.neg(miterVec), [0, v], context);\n            indexPairs(1, context);\n        }\n        else {\n            addVertex(coordCurr, normPrev, [1, v], context);\n            addVertex(coordCurr, Vector.neg(normPrev), [0, v], context);\n            indexPairs(1, context);\n        }\n    }\n}\n\nfunction createMiterVec(normPrev, normNext) {\n    var miterVec = Vector.normalize(Vector.add(normPrev, normNext));\n    var scale = 2 / (1 + Math.abs(Vector.dot(normPrev, miterVec)));\n    return Vector.mult(miterVec, scale * scale);\n}\n\n// Add a miter vector or a join if the miter is too sharp\nfunction addMiter (v, coordCurr, normPrev, normNext, miter_len_sq, isBeginning, context) {\n    var miterVec = createMiterVec(normPrev, normNext);\n\n    //  Miter limit: if miter join is too sharp, convert to bevel instead\n    if (Vector.lengthSq(miterVec) > miter_len_sq) {\n        addJoin(JOIN_TYPE.bevel, v, coordCurr, normPrev, normNext, isBeginning, context);\n    }\n    else {\n        addVertex(coordCurr, miterVec, [1, v], context);\n        addVertex(coordCurr, Vector.neg(miterVec), [0, v], context);\n        if (!isBeginning) {\n            indexPairs(1, context);\n        }\n    }\n}\n\n// Add a bevel or round join\nfunction addJoin(join_type, v, coordCurr, normPrev, normNext, isBeginning, context) {\n    var miterVec = createMiterVec(normPrev, normNext);\n    var isClockwise = (normNext[0] * normPrev[1] - normNext[1] * normPrev[0] > 0);\n\n    if (isClockwise){\n        addVertex(coordCurr, miterVec, [1, v], context);\n        addVertex(coordCurr, Vector.neg(normPrev), [0, v], context);\n\n        if (!isBeginning) {\n            indexPairs(1, context);\n        }\n\n        if (join_type === JOIN_TYPE.bevel) {\n            addBevel(coordCurr,\n                Vector.neg(normPrev), miterVec, Vector.neg(normNext),\n                [0, v], [1, v], [0, v],\n                context\n            );\n        }\n        else if (join_type === JOIN_TYPE.round) {\n            addFan(coordCurr,\n                Vector.neg(normPrev), miterVec, Vector.neg(normNext),\n                [0, v], [1, v], [0, v],\n                false, context\n            );\n        }\n\n        addVertex(coordCurr, miterVec, [1, v], context);\n        addVertex(coordCurr, Vector.neg(normNext), [0, v], context);\n    }\n    else {\n        addVertex(coordCurr, normPrev, [1, v], context);\n        addVertex(coordCurr, Vector.neg(miterVec), [0, v], context);\n\n        if (!isBeginning) {\n            indexPairs(1, context);\n        }\n\n        if (join_type === JOIN_TYPE.bevel) {\n            addBevel(coordCurr,\n                normPrev, Vector.neg(miterVec), normNext,\n                [1, v], [0, v], [1, v],\n                context\n            );\n        }\n        else if (join_type === JOIN_TYPE.round) {\n            addFan(coordCurr,\n                normPrev, Vector.neg(miterVec), normNext,\n                [1, v], [0, v], [1, v],\n                false, context\n            );\n        }\n\n        addVertex(coordCurr, normNext, [1, v], context);\n        addVertex(coordCurr, Vector.neg(miterVec), [0, v], context);\n    }\n}\n\n// Add indices to vertex_elements\nfunction indexPairs(num_pairs, context){\n    var vertex_elements = context.vertex_data.vertex_elements;\n    var num_vertices = context.vertex_data.vertex_count;\n    var offset = num_vertices - 2 * num_pairs - 2;\n\n    for (var i = 0; i < num_pairs; i++){\n        vertex_elements.push(offset + 2 * i + 2);\n        vertex_elements.push(offset + 2 * i + 1);\n        vertex_elements.push(offset + 2 * i + 0);\n        vertex_elements.push(offset + 2 * i + 2);\n        vertex_elements.push(offset + 2 * i + 3);\n        vertex_elements.push(offset + 2 * i + 1);\n    }\n}\n\nfunction addVertex(coordinate, normal, uv, context) {\n    var vertex_template = context.vertex_template;\n    var vertex_data = context.vertex_data;\n\n    buildVertexTemplate(vertex_template, coordinate, uv, normal, context);\n    vertex_data.addVertex(vertex_template);\n}\n\nfunction buildVertexTemplate (vertex_template, vertex, texture_coord, scale, context) {\n    // set vertex position\n    vertex_template[0] = vertex[0];\n    vertex_template[1] = vertex[1];\n\n    // set UVs\n    if (context.texcoord_index && texture_coord) {\n        vertex_template[context.texcoord_index + 0] = texture_coord[0] * context.texcoord_normalize;\n        vertex_template[context.texcoord_index + 1] = texture_coord[1] * context.texcoord_normalize;\n    }\n\n    // set Scaling vertex (X, Y normal direction + Z half_width as attribute)\n    if (context.scaling_index) {\n        vertex_template[context.scaling_index + 0] = scale[0] * context.scaling_normalize;\n        vertex_template[context.scaling_index + 1] = scale[1] * context.scaling_normalize;\n        vertex_template[context.scaling_index + 2] = context.half_width;\n    }\n}\n\n//  Tessalate a FAN geometry between points A       B\n//  using their normals from a center        \\ . . /\n//  and interpolating their UVs               \\ p /\n//                                             \\./\nfunction addFan (coord, nA, nC, nB, uvA, uvC, uvB, isCap, context) {\n    var cross = nA[0] * nB[1] - nA[1] * nB[0];\n    var dot = Vector.dot(nA, nB);\n\n    var angle = Math.atan2(cross, dot);\n    while (angle >= Math.PI) {\n        angle -= 2*Math.PI;\n    }\n\n    var numTriangles = trianglesPerArc(angle, context.half_width);\n    if (numTriangles < 1) {\n        return;\n    }\n\n    var pivotIndex = context.vertex_data.vertex_count;\n    var vertex_elements = context.vertex_data.vertex_elements;\n\n    addVertex(coord, nC, uvC, context);\n    addVertex(coord, nA, uvA, context);\n\n    var blade = nA;\n\n    if (context.texcoord_index !== undefined) {\n        var uvCurr;\n        if (isCap){\n            uvCurr = [];\n            var affine_uvCurr = Vector.sub(uvA, uvC);\n        }\n        else {\n            uvCurr = Vector.set(uvA);\n            var uv_delta = Vector.div(Vector.sub(uvB, uvA), numTriangles);\n        }\n    }\n\n    var angle_step = angle / numTriangles;\n    for (var i = 0; i < numTriangles; i++) {\n        blade = Vector.rot(blade, angle_step);\n\n        if (context.texcoord_index !== undefined) {\n            if (isCap){\n                // UV textures go \"through\" the cap\n                affine_uvCurr = Vector.rot(affine_uvCurr, angle_step);\n                uvCurr[0] = affine_uvCurr[0] + uvC[0];\n                uvCurr[1] = affine_uvCurr[1] * context.texcoord_width * context.v_scale + uvC[1]; // scale the v-coordinate\n            }\n            else {\n                // UV textures go \"around\" the join\n                uvCurr = Vector.add(uvCurr, uv_delta);\n            }\n        }\n\n        addVertex(coord, blade, uvCurr, context);\n\n        vertex_elements.push(pivotIndex + i + ((cross > 0) ? 2 : 1));\n        vertex_elements.push(pivotIndex);\n        vertex_elements.push(pivotIndex + i + ((cross > 0) ? 1 : 2));\n    }\n}\n\n//  addBevel    A ----- B\n//             / \\     / \\\n//           /   /\\   /\\  \\\n//              /  \\ /  \\  \\\n//                / C \\\nfunction addBevel (coord, nA, nC, nB, uA, uC, uB, context) {\n    var pivotIndex = context.vertex_data.vertex_count;\n\n    addVertex(coord, nC, uC, context);\n    addVertex(coord, nA, uA, context);\n    addVertex(coord, nB, uB, context);\n\n    var orientation = nA[0] * nB[1] - nA[1] * nB[0] > 0;\n\n    var vertex_elements = context.vertex_data.vertex_elements;\n\n    if (orientation) {\n        vertex_elements.push(pivotIndex + 2);\n        vertex_elements.push(pivotIndex + 0);\n        vertex_elements.push(pivotIndex + 1);\n    } else {\n        vertex_elements.push(pivotIndex + 1);\n        vertex_elements.push(pivotIndex + 0);\n        vertex_elements.push(pivotIndex + 2);\n    }\n}\n\n//  Function to add the vertex need for line caps,\n//  because re-use the buffers needs to be at the end\nfunction addCap (coord, v, normal, type, isBeginning, context) {\n    var neg_normal = Vector.neg(normal);\n\n    switch (type){\n        case CAP_TYPE.square:\n            var tangent;\n            if (isBeginning){\n                tangent = [normal[1], -normal[0]];\n\n                addVertex(coord, Vector.add(normal, tangent), [1, v], context);\n                addVertex(coord, Vector.add(neg_normal, tangent), [0, v], context);\n\n                // Add length of square cap to texture coordinate\n                v += 0.5 * context.texcoord_width * context.v_scale;\n\n                addVertex(coord, normal, [1, v], context);\n                addVertex(coord, neg_normal, [0, v], context);\n            }\n            else {\n                tangent = [-normal[1], normal[0]];\n\n                addVertex(coord, normal, [1, v], context);\n                addVertex(coord, neg_normal, [0, v], context);\n\n                // Add length of square cap to texture coordinate\n                v += 0.5 * context.texcoord_width * context.v_scale;\n\n                addVertex(coord, Vector.add(normal, tangent), [1, v], context);\n                addVertex(coord, Vector.add(neg_normal, tangent), [0, v], context);\n            }\n\n            indexPairs(1, context);\n            break;\n        case CAP_TYPE.round:\n            var nA, nB, uvA, uvB, uvC;\n            if (isBeginning) {\n                nA = normal;\n                nB = neg_normal;\n\n                if (context.texcoord_index !== undefined){\n                    v += 0.5 * context.texcoord_width * context.v_scale;\n                    uvA = [1, v];\n                    uvB = [0, v];\n                    uvC = [0.5, v];\n                }\n            }\n            else {\n                nA = neg_normal;\n                nB = normal;\n\n                if (context.texcoord_index !== undefined){\n                    uvA = [0, v];\n                    uvB = [1, v];\n                    uvC = [0.5, v];\n                }\n            }\n\n            addFan(coord,\n                nA, zero_vec2, nB,\n                uvA, uvC, uvB,\n                true, context\n            );\n\n            break;\n        case CAP_TYPE.butt:\n            return;\n    }\n}\n\n// For IE Math.log2 support\nlet log2 = Math.log2 || function(x){ return Math.log(x) * Math.LOG2E; };\n\n// Calculate number of triangles for a fan given an angle and line width\nfunction trianglesPerArc (angle, width) {\n    if (angle < 0) {\n        angle = -angle;\n    }\n\n    var numTriangles = (width > 2 * DEFAULT.MIN_FAN_WIDTH) ? log2(width / DEFAULT.MIN_FAN_WIDTH) : 1;\n    return Math.ceil(angle / Math.PI * numTriangles);\n}\n\n// Cyclically permute closed line starting at an index\nfunction permuteLine(line, startIndex){\n    var newLine = [];\n    for (let i = 0; i < line.length; i++){\n        var index = (i + startIndex) % line.length;\n        // skip the first (repeated) index\n        if (index !== 0) {\n            newLine.push(line[index]);\n        }\n    }\n    newLine.push(newLine[0]);\n    return newLine;\n}",
     "import Utils from './utils/utils';\nimport ShaderProgram from './gl/shader_program';\nimport {mat4, mat3, vec3} from './utils/gl-matrix';\n\n// Abstract base class\nexport default class Camera {\n\n    constructor(name, view, options = {}) {\n        this.view = view;\n        this.position = options.position;\n        this.zoom = options.zoom;\n    }\n\n    // Create a camera by type name, factory-style\n    static create(name, view, config) {\n        switch (config.type) {\n            case 'isometric':\n                return new IsometricCamera(name, view, config);\n            case 'flat':\n                return new FlatCamera(name, view, config);\n            case 'perspective':\n            /* falls through */\n            default:\n                return new PerspectiveCamera(name, view, config);\n        }\n    }\n\n    // Update method called once per frame\n    update() {\n    }\n\n    // Called once per frame per program (e.g. for main render pass, then for each additional pass for feature selection, etc.)\n    setupProgram(program) {\n    }\n\n    // Sync camera position/zoom to scene view\n    updateView () {\n        if (this.position || this.zoom) {\n            var view = {};\n            if (this.position) {\n                view = { lng: this.position[0], lat: this.position[1], zoom: this.position[2] };\n            }\n            if (this.zoom) {\n                view.zoom = this.zoom;\n            }\n            this.view.setView(view);\n        }\n    }\n\n    // Set model-view and normal matrices\n    setupMatrices (matrices, program) {\n        // Model view matrix - transform tile space into view space (meters, relative to camera)\n        mat4.multiply(matrices.model_view32, this.view_matrix, matrices.model);\n        program.uniform('Matrix4fv', 'u_modelView', matrices.model_view32);\n\n        // Normal matrices - transforms surface normals into view space\n        mat3.normalFromMat4(matrices.normal32, matrices.model_view32);\n        mat3.invert(matrices.inverse_normal32, matrices.normal32);\n        program.uniform('Matrix3fv', 'u_normalMatrix', matrices.normal32);\n        program.uniform('Matrix3fv', 'u_inverseNormalMatrix', matrices.inverse_normal32);\n    }\n\n}\n\n/**\n    Perspective matrix projection\n\n    This is a specialized perspective camera that, given a desired camera focal length (which can also vary by zoom level),\n    constrains the camera height above the ground plane such that the displayed ground area of the map matches that of\n    a traditional web mercator map. This means you can set the camera location by [lat, lng, zoom] as you would a typical\n    web mercator map, then adjust the focal length as needed.\n\n    Vanishing point can also be adjusted to achieve different \"viewing angles\", e.g. instead of looking straight down into\n    the center of the viewport, the camera appears to be tilted at an angle. For example:\n\n    [0, 0] = looking towards center of viewport\n    [-250, -250] = looking 250 pixels from the viewport center to the lower-left corner\n    [400, 0] = looking 400 pixels to the right of the viewport center\n*/\nclass PerspectiveCamera extends Camera {\n\n    constructor(name, view, options = {}) {\n        super(name, view, options);\n        this.type = 'perspective';\n\n        // a single scalar, or pairs of stops mapping zoom levels, e.g. [zoom, focal length]\n        this.focal_length = options.focal_length;\n        this.fov = options.fov;\n        if (!this.focal_length && !this.fov) {\n            // Default focal length ranges by zoom\n            this.focal_length = [[16, 2], [17, 2.5], [18, 3], [19, 4], [20, 6]];\n        }\n\n        this.vanishing_point = options.vanishing_point || [0, 0]; // [x, y]\n        this.vanishing_point = this.vanishing_point.map(parseFloat); // we implicitly only support px units here\n        this.vanishing_point_skew = [];\n\n        this.position_meters = null;\n        this.view_matrix = new Float64Array(16);\n        this.projection_matrix = new Float32Array(16);\n\n        // 'camera' is the name of the shader block, e.g. determines where in the shader this code is injected\n        ShaderProgram.replaceBlock('camera', `\n            uniform mat4 u_projection;\n            uniform vec3 u_eye;\n            uniform vec2 u_vanishing_point;\n\n            void cameraProjection (inout vec4 position) {\n                position = u_projection * position;\n            }`\n        );\n    }\n\n    // Constrains the camera so that the viewable area matches given the viewport height\n    // (in world space, e.g. meters), given either a camera focal length or field-of-view\n    // (focal length is used if both are passed).\n    constrainCamera({ view_height, height, focal_length, fov }) {\n        // Solve for camera height\n        if (!height) {\n            // We have focal length, calculate FOV\n            if (focal_length) {\n                fov = Math.atan(1 / focal_length) * 2;\n            }\n            // We have FOV, calculate focal length\n            else if (fov) {\n                fov = fov * Math.PI / 180; // convert FOV degrees to radians\n                focal_length = 1 / Math.tan(fov / 2);\n            }\n\n            // Distance that camera should be from ground such that it fits the field of view expected\n            // for a conventional web mercator map at the current zoom level and camera focal length\n            height = view_height / 2 * focal_length;\n        }\n        // Solve for camera focal length / field-of-view\n        else {\n            focal_length = 2 * height / view_height;\n            fov = Math.atan(1 / focal_length) * 2;\n        }\n\n        return { view_height, height, focal_length, fov };\n    }\n\n    updateMatrices() {\n        // TODO: only re-calculate these vars when necessary\n\n        // Height of the viewport in meters at current zoom\n        var viewport_height = this.view.size.css.height * this.view.meters_per_pixel;\n\n        // Compute camera properties to fit desired view\n        var { height, fov } = this.constrainCamera({\n            view_height: viewport_height,\n            focal_length: Utils.interpolate(this.view.zoom, this.focal_length),\n            fov: Utils.interpolate(this.view.zoom, this.fov)\n         });\n\n        // View matrix\n        var position = [this.view.center.meters.x, this.view.center.meters.y, height];\n        this.position_meters = position;\n\n        // mat4.lookAt(this.view_matrix,\n        //     vec3.fromValues(...position),\n        //     vec3.fromValues(position[0], position[1], height - 1),\n        //     vec3.fromValues(0, 1, 0));\n        // Exclude camera height from view matrix\n        mat4.lookAt(this.view_matrix,\n            vec3.fromValues(position[0], position[1], 0),\n            vec3.fromValues(position[0], position[1], -1),\n            vec3.fromValues(0, 1, 0));\n\n        // Projection matrix\n        mat4.perspective(this.projection_matrix, fov, this.view.aspect, 1, height * 2);\n\n        // Convert vanishing point from pixels to viewport space\n        this.vanishing_point_skew[0] = this.vanishing_point[0] / this.view.size.css.width;\n        this.vanishing_point_skew[1] = this.vanishing_point[1] / this.view.size.css.height;\n\n        // Adjust projection matrix to include vanishing point skew\n        this.projection_matrix[8] = -this.vanishing_point_skew[0] * 2; // z column of x row, e.g. amount z skews x\n        this.projection_matrix[9] = -this.vanishing_point_skew[1] * 2; // z column of y row, e.g. amount z skews y\n\n        // Translate geometry into the distance so that camera is appropriate height above ground\n        // Additionally, adjust xy to compensate for any vanishing point skew, e.g. move geometry so that the displayed g\n        // plane of the map matches that expected by a traditional web mercator map at this [lat, lng, zoom].\n        mat4.translate(this.projection_matrix, this.projection_matrix,\n            vec3.fromValues(\n                viewport_height/2 * this.view.aspect * (-this.vanishing_point_skew[0] * 2),\n                viewport_height/2 * (-this.vanishing_point_skew[1] * 2),\n                0\n            )\n        );\n\n        // Include camera height in projection matrix\n        mat4.translate(this.projection_matrix, this.projection_matrix, vec3.fromValues(0, 0, -height));\n    }\n\n    update() {\n        super.update();\n        this.updateMatrices();\n    }\n\n    setupProgram(program) {\n        program.uniform('Matrix4fv', 'u_projection', this.projection_matrix);\n        program.uniform('3f', 'u_eye', [0, 0, this.position_meters[2]]);\n        program.uniform('2fv', 'u_vanishing_point', this.vanishing_point_skew);\n    }\n\n}\n\n// Isometric-style projection\n// Note: this is actually an \"axonometric\" projection, but I'm using the colloquial term isometric because it is more recognizable.\n// An isometric projection is a specific subset of axonometric projections.\n// 'axis' determines the xy skew applied to a vertex based on its z coordinate, e.g. [0, 1] axis causes buildings to be drawn\n// straight upwards on screen at their true height, [0, .5] would draw them up at half-height, [1, 0] would be sideways, etc.\nclass IsometricCamera extends Camera {\n\n    constructor(name, view, options = {}) {\n        super(name, view, options);\n        this.type = 'isometric';\n        this.axis = options.axis || { x: 0, y: 1 };\n        if (this.axis.length === 2) {\n            this.axis = { x: this.axis[0], y: this.axis[1] }; // allow axis to also be passed as 2-elem array\n        }\n\n        this.position_meters = null;\n        this.viewport_height = null;\n\n        this.view_matrix = new Float64Array(16);\n        this.projection_matrix = new Float32Array(16);\n\n        // 'camera' is the name of the shader block, e.g. determines where in the shader this code is injected\n        ShaderProgram.replaceBlock('camera', `\n            uniform mat4 u_projection;\n            uniform vec3 u_eye;\n            uniform vec2 u_vanishing_point;\n\n            void cameraProjection (inout vec4 position) {\n                position = u_projection * position;\n                // position.xy += position.z * u_isometric_axis;\n\n                // Reverse z for depth buffer so up is negative,\n                // and scale down values so objects higher than one screen height will not get clipped\n                // pull forward slightly to avoid going past far clipping plane\n                position.z = -position.z / 100. + 1. - 0.001;\n            }`\n        );\n    }\n\n    update() {\n        super.update();\n\n        this.viewport_height = this.view.size.css.height * this.view.meters_per_pixel;\n        var position = [this.view.center.meters.x, this.view.center.meters.y, this.viewport_height];\n        this.position_meters = position;\n\n        // View\n        mat4.identity(this.view_matrix);\n        mat4.translate(this.view_matrix, this.view_matrix, vec3.fromValues(-position[0], -position[1], 0));\n\n        // Projection\n        mat4.identity(this.projection_matrix);\n\n        // apply isometric skew\n        this.projection_matrix[8] = this.axis.x / this.view.aspect; // z column of x row, e.g. amount z skews x\n        this.projection_matrix[9] = this.axis.y;                    // z column of x row, e.g. amount z skews y\n\n        // convert meters to viewport\n        mat4.scale(this.projection_matrix, this.projection_matrix,\n            vec3.fromValues(\n                2 / this.view.size.meters.x,\n                2 / this.view.size.meters.y,\n                2 / this.view.size.meters.y\n            )\n        );\n    }\n\n    setupProgram(program) {\n        program.uniform('Matrix4fv', 'u_projection', this.projection_matrix);\n\n        program.uniform('3fv', 'u_eye', [0, 0, this.viewport_height]);\n        // program.uniform('3f', 'u_eye', this.viewport_height * this.axis.x, this.viewport_height * this.axis.y, this.viewport_height);\n        program.uniform('2fv', 'u_vanishing_point', [0, 0]);\n    }\n\n}\n\n// Flat projection (e.g. just top-down, no perspective) - a degenerate isometric camera\nclass FlatCamera extends IsometricCamera {\n\n    constructor(name, view, options = {}) {\n        super(name, view, options);\n        this.type = 'flat';\n    }\n\n    update() {\n        // Axis is fixed to (0, 0) for flat camera\n        this.axis.x = 0;\n        this.axis.y = 0;\n\n        super.update();\n    }\n\n}\n",
-    "// Miscellaneous geo functions\n\nvar Geo;\nexport default Geo = {};\n\n// Projection constants\nGeo.default_source_max_zoom = 18;\nGeo.default_view_max_zoom = 20;\nGeo.tile_size = 256;\nGeo.half_circumference_meters = 20037508.342789244;\nGeo.circumference_meters = Geo.half_circumference_meters * 2;\nGeo.min_zoom_meters_per_pixel = Geo.circumference_meters / Geo.tile_size; // min zoom draws world as 2 tiles wide\n\nlet meters_per_pixel = [];\nGeo.metersPerPixel = function (z) {\n    meters_per_pixel[z] = meters_per_pixel[z] || Geo.min_zoom_meters_per_pixel / Math.pow(2, z);\n    return meters_per_pixel[z];\n};\n\nlet meters_per_tile = [];\nGeo.metersPerTile = function (z) {\n    meters_per_tile[z] = meters_per_tile[z] || Geo.circumference_meters / Math.pow(2, z);\n    return meters_per_tile[z];\n};\n\n// Conversion functions based on an defined tile scale\nGeo.tile_scale = 4096; // coordinates are locally scaled to the range [0, tile_scale]\nGeo.units_per_pixel = Geo.tile_scale / Geo.tile_size;\nGeo.height_scale = 16;  // provides sub-meter precision for height values (16ths of a meters)\n\nlet units_per_meter = [];\nGeo.unitsPerMeter = function (z) {\n    units_per_meter[z] = units_per_meter[z] || Geo.tile_scale / (Geo.tile_size * Geo.metersPerPixel(z));\n    return units_per_meter[z];\n};\n\n// Convert tile location to mercator meters - multiply by pixels per tile, then by meters per pixel, adjust for map origin\nGeo.metersForTile = function (tile) {\n    return {\n        x: tile.x * Geo.circumference_meters / Math.pow(2, tile.z) - Geo.half_circumference_meters,\n        y: -(tile.y * Geo.circumference_meters / Math.pow(2, tile.z) - Geo.half_circumference_meters)\n    };\n};\n\n/**\n   Given a point in mercator meters and a zoom level, return the tile X/Y/Z that the point lies in\n*/\nGeo.tileForMeters = function ([x, y], zoom) {\n    return {\n        x: Math.floor((x + Geo.half_circumference_meters) / (Geo.circumference_meters / Math.pow(2, zoom))),\n        y: Math.floor((-y + Geo.half_circumference_meters) / (Geo.circumference_meters / Math.pow(2, zoom))),\n        z: zoom\n    };\n};\n\n// Wrap a tile to positive #s for zoom\n// Optionally specify the axes to wrap\nGeo.wrapTile = function({ x, y, z }, mask = { x: true, y: false }) {\n    var m = (1 << z) - 1;\n    if (mask.x) {\n        x = x & m;\n    }\n    if (mask.y) {\n        y = y & m;\n    }\n    return { x, y, z };\n};\n\n/**\n   Convert mercator meters to lat-lng\n*/\nGeo.metersToLatLng = function ([x, y]) {\n\n    x /= Geo.half_circumference_meters;\n    y /= Geo.half_circumference_meters;\n\n    y = (2 * Math.atan(Math.exp(y * Math.PI)) - (Math.PI / 2)) / Math.PI;\n\n    x *= 180;\n    y *= 180;\n\n    return [x, y];\n};\n\n/**\n  Convert lat-lng to mercator meters\n*/\nGeo.latLngToMeters = function([x, y]) {\n\n    // Latitude\n    y = Math.log(Math.tan(y*Math.PI/360 + Math.PI/4)) / Math.PI;\n    y *= Geo.half_circumference_meters;\n\n    // Longitude\n    x *= Geo.half_circumference_meters / 180;\n\n    return [x, y];\n};\n\nGeo.wrapLng = function(x) {\n    if (x > 180 || x < -180) {\n        x = ((x + 180) % 360 + 360) % 360 - 180;\n    }\n    return x;\n};\n\n// Run an in-place transform function on each cooordinate in a GeoJSON geometry\nGeo.transformGeometry = function (geometry, transform) {\n    if (geometry == null) {\n        return; // skip if missing geometry (valid GeoJSON)\n    }\n\n    if (geometry.type === 'Point') {\n        transform(geometry.coordinates);\n    }\n    else if (geometry.type === 'LineString' || geometry.type === 'MultiPoint') {\n        geometry.coordinates.forEach(transform);\n    }\n    else if (geometry.type === 'Polygon' || geometry.type === 'MultiLineString') {\n        geometry.coordinates.forEach(coordinates => coordinates.forEach(transform));\n    }\n    else if (geometry.type === 'MultiPolygon') {\n        geometry.coordinates.forEach(polygon => {\n            polygon.forEach(coordinates => coordinates.forEach(transform));\n        });\n    }\n    // TODO: support GeometryCollection\n};\n\nGeo.boxIntersect = function (b1, b2) {\n    return !(\n        b2.sw.x > b1.ne.x ||\n        b2.ne.x < b1.sw.x ||\n        b2.sw.y > b1.ne.y ||\n        b2.ne.y < b1.sw.y\n    );\n};\n\n// Finds the axis-aligned bounding box for a polygon\nGeo.findBoundingBox = function (polygon) {\n    var min_x = Infinity,\n        max_x = -Infinity,\n        min_y = Infinity,\n        max_y = -Infinity;\n\n    // Only need to examine outer ring (polygon[0])\n    var num_coords = polygon[0].length;\n    for (var c=0; c < num_coords; c++) {\n        var coord = polygon[0][c];\n\n        if (coord[0] < min_x) {\n            min_x = coord[0];\n        }\n        if (coord[1] < min_y) {\n            min_y = coord[1];\n        }\n        if (coord[0] > max_x) {\n            max_x = coord[0];\n        }\n        if (coord[1] > max_y) {\n            max_y = coord[1];\n        }\n    }\n\n    return [min_x, min_y, max_x, max_y];\n};\n\n// Convert geometry type to one of: 'point', 'line', 'polygon'\nGeo.geometryType = function(type) {\n    if (type === 'Polygon' || type === 'MultiPolygon') {\n        return 'polygon';\n    }\n    else if (type === 'LineString' || type === 'MultiLineString') {\n        return 'line';\n    }\n    if (type === 'Point' || type === 'MultiPoint') {\n        return 'point';\n    }\n};\n\nGeo.centroid = function (polygon) {\n    if (!polygon || polygon.length === 0) {\n        return;\n    }\n\n    // Adapted from https://github.com/Leaflet/Leaflet/blob/c10f405a112142b19785967ce0e142132a6095ad/src/layer/vector/Polygon.js#L57\n    let x = 0, y = 0, area = 0;\n    let ring = polygon[0]; // only use first ring for now\n    let len = ring.length;\n\n    for (let i = 0, j = len - 1; i < len; j = i, i++) {\n        let p0 = ring[i];\n        let p1 = ring[j];\n        let f = p0[1] * p1[0] - p1[1] * p0[0];\n\n        x += (p0[0] + p1[0]) * f;\n        y += (p0[1] + p1[1]) * f;\n        area += f * 3;\n    }\n\n    return [x / area, y / area];\n};\n\nGeo.multiCentroid = function (polygons) {\n    let n = polygons.length;\n    let centroid = [0, 0];\n\n    for (let p=0; p < polygons.length; p++) {\n        let c = Geo.centroid(polygons[p]);\n        centroid[0] += c[0];\n        centroid[1] += c[1];\n    }\n\n    centroid[0] /= n;\n    centroid[1] /= n;\n\n    return centroid;\n};\n\nGeo.signedPolygonRingAreaSum = function (ring) {\n    let area = 0;\n    let n = ring.length;\n\n    for (let i = 0; i < n - 1; i++) {\n        let p0 = ring[i];\n        let p1 = ring[i+1];\n\n        area += p0[0] * p1[1] - p1[0] * p0[1];\n    }\n\n    area += ring[n - 1][0] * ring[0][1] - ring[0][0] * ring[n - 1][1];\n    return area;\n};\n\nGeo.polygonRingArea = function (ring) {\n    return Math.abs(Geo.signedPolygonRingAreaSum(ring)) / 2;\n};\n\n// TODO: subtract inner rings\nGeo.polygonArea = function (polygon) {\n    if (!polygon) {\n        return;\n    }\n    return Geo.polygonRingArea(polygon[0]);\n};\n\nGeo.multiPolygonArea = function (polygons) {\n    let area = 0;\n\n    for (let p=0; p < polygons.length; p++) {\n        area += Geo.polygonArea(polygons[p]);\n    }\n\n    return area;\n};\n\nGeo.ringWinding = function (ring) {\n    let area = Geo.signedPolygonRingAreaSum(ring);\n    if (area > 0) {\n        return 'CW';\n    }\n    else if (area < 0) {\n        return 'CCW';\n    }\n    // return undefined on zero area polygon\n};\n",
+    "// Miscellaneous geo functions\n\nvar Geo;\nexport default Geo = {};\n\n// Projection constants\nGeo.default_source_max_zoom = 18;\nGeo.default_view_max_zoom = 20;\nGeo.tile_size = 256;\nGeo.half_circumference_meters = 20037508.342789244;\nGeo.circumference_meters = Geo.half_circumference_meters * 2;\nGeo.min_zoom_meters_per_pixel = Geo.circumference_meters / Geo.tile_size; // min zoom draws world as 2 tiles wide\n\nlet meters_per_pixel = [];\nGeo.metersPerPixel = function (z) {\n    meters_per_pixel[z] = meters_per_pixel[z] || Geo.min_zoom_meters_per_pixel / Math.pow(2, z);\n    return meters_per_pixel[z];\n};\n\nlet meters_per_tile = [];\nGeo.metersPerTile = function (z) {\n    meters_per_tile[z] = meters_per_tile[z] || Geo.circumference_meters / Math.pow(2, z);\n    return meters_per_tile[z];\n};\n\n// Conversion functions based on an defined tile scale\nGeo.tile_scale = 4096; // coordinates are locally scaled to the range [0, tile_scale]\nGeo.units_per_pixel = Geo.tile_scale / Geo.tile_size;\nGeo.height_scale = 16;  // provides sub-meter precision for height values (16ths of a meters)\n\nlet units_per_meter = [];\nGeo.unitsPerMeter = function (z) {\n    units_per_meter[z] = units_per_meter[z] || Geo.tile_scale / (Geo.tile_size * Geo.metersPerPixel(z));\n    return units_per_meter[z];\n};\n\n// Convert tile location to mercator meters - multiply by pixels per tile, then by meters per pixel, adjust for map origin\nGeo.metersForTile = function (tile) {\n    return {\n        x: tile.x * Geo.circumference_meters / Math.pow(2, tile.z) - Geo.half_circumference_meters,\n        y: -(tile.y * Geo.circumference_meters / Math.pow(2, tile.z) - Geo.half_circumference_meters)\n    };\n};\n\n/**\n   Given a point in mercator meters and a zoom level, return the tile X/Y/Z that the point lies in\n*/\nGeo.tileForMeters = function ([x, y], zoom) {\n    return {\n        x: Math.floor((x + Geo.half_circumference_meters) / (Geo.circumference_meters / Math.pow(2, zoom))),\n        y: Math.floor((-y + Geo.half_circumference_meters) / (Geo.circumference_meters / Math.pow(2, zoom))),\n        z: zoom\n    };\n};\n\n// Wrap a tile to positive #s for zoom\n// Optionally specify the axes to wrap\nGeo.wrapTile = function({ x, y, z }, mask = { x: true, y: false }) {\n    var m = (1 << z) - 1;\n    if (mask.x) {\n        x = x & m;\n    }\n    if (mask.y) {\n        y = y & m;\n    }\n    return { x, y, z };\n};\n\n/**\n   Convert mercator meters to lat-lng\n*/\nGeo.metersToLatLng = function ([x, y]) {\n\n    x /= Geo.half_circumference_meters;\n    y /= Geo.half_circumference_meters;\n\n    y = (2 * Math.atan(Math.exp(y * Math.PI)) - (Math.PI / 2)) / Math.PI;\n\n    x *= 180;\n    y *= 180;\n\n    return [x, y];\n};\n\n/**\n  Convert lat-lng to mercator meters\n*/\nGeo.latLngToMeters = function([x, y]) {\n\n    // Latitude\n    y = Math.log(Math.tan(y*Math.PI/360 + Math.PI/4)) / Math.PI;\n    y *= Geo.half_circumference_meters;\n\n    // Longitude\n    x *= Geo.half_circumference_meters / 180;\n\n    return [x, y];\n};\n\n// Run an in-place transform function on each cooordinate in a GeoJSON geometry\nGeo.transformGeometry = function (geometry, transform) {\n    if (geometry == null) {\n        return; // skip if missing geometry (valid GeoJSON)\n    }\n\n    if (geometry.type === 'Point') {\n        transform(geometry.coordinates);\n    }\n    else if (geometry.type === 'LineString' || geometry.type === 'MultiPoint') {\n        geometry.coordinates.forEach(transform);\n    }\n    else if (geometry.type === 'Polygon' || geometry.type === 'MultiLineString') {\n        geometry.coordinates.forEach(coordinates => coordinates.forEach(transform));\n    }\n    else if (geometry.type === 'MultiPolygon') {\n        geometry.coordinates.forEach(polygon => {\n            polygon.forEach(coordinates => coordinates.forEach(transform));\n        });\n    }\n    // TODO: support GeometryCollection\n};\n\nGeo.boxIntersect = function (b1, b2) {\n    return !(\n        b2.sw.x > b1.ne.x ||\n        b2.ne.x < b1.sw.x ||\n        b2.sw.y > b1.ne.y ||\n        b2.ne.y < b1.sw.y\n    );\n};\n\n// Finds the axis-aligned bounding box for a polygon\nGeo.findBoundingBox = function (polygon) {\n    var min_x = Infinity,\n        max_x = -Infinity,\n        min_y = Infinity,\n        max_y = -Infinity;\n\n    // Only need to examine outer ring (polygon[0])\n    var num_coords = polygon[0].length;\n    for (var c=0; c < num_coords; c++) {\n        var coord = polygon[0][c];\n\n        if (coord[0] < min_x) {\n            min_x = coord[0];\n        }\n        if (coord[1] < min_y) {\n            min_y = coord[1];\n        }\n        if (coord[0] > max_x) {\n            max_x = coord[0];\n        }\n        if (coord[1] > max_y) {\n            max_y = coord[1];\n        }\n    }\n\n    return [min_x, min_y, max_x, max_y];\n};\n\n// Convert geometry type to one of: 'point', 'line', 'polygon'\nGeo.geometryType = function(type) {\n    if (type === 'Polygon' || type === 'MultiPolygon') {\n        return 'polygon';\n    }\n    else if (type === 'LineString' || type === 'MultiLineString') {\n        return 'line';\n    }\n    if (type === 'Point' || type === 'MultiPoint') {\n        return 'point';\n    }\n};\n\nGeo.centroid = function (polygon) {\n    if (!polygon || polygon.length === 0) {\n        return;\n    }\n\n    // Adapted from https://github.com/Leaflet/Leaflet/blob/c10f405a112142b19785967ce0e142132a6095ad/src/layer/vector/Polygon.js#L57\n    let x = 0, y = 0, area = 0;\n    let ring = polygon[0]; // only use first ring for now\n    let len = ring.length;\n\n    for (let i = 0, j = len - 1; i < len; j = i, i++) {\n        let p0 = ring[i];\n        let p1 = ring[j];\n        let f = p0[1] * p1[0] - p1[1] * p0[0];\n\n        x += (p0[0] + p1[0]) * f;\n        y += (p0[1] + p1[1]) * f;\n        area += f * 3;\n    }\n\n    return [x / area, y / area];\n};\n\nGeo.multiCentroid = function (polygons) {\n    let n = polygons.length;\n    let centroid = [0, 0];\n\n    for (let p=0; p < polygons.length; p++) {\n        let c = Geo.centroid(polygons[p]);\n        centroid[0] += c[0];\n        centroid[1] += c[1];\n    }\n\n    centroid[0] /= n;\n    centroid[1] /= n;\n\n    return centroid;\n};\n\nGeo.signedPolygonRingAreaSum = function (ring) {\n    let area = 0;\n    let n = ring.length;\n\n    for (let i = 0; i < n - 1; i++) {\n        let p0 = ring[i];\n        let p1 = ring[i+1];\n\n        area += p0[0] * p1[1] - p1[0] * p0[1];\n    }\n\n    area += ring[n - 1][0] * ring[0][1] - ring[0][0] * ring[n - 1][1];\n    return area;\n};\n\nGeo.polygonRingArea = function (ring) {\n    return Math.abs(Geo.signedPolygonRingAreaSum(ring)) / 2;\n};\n\n// TODO: subtract inner rings\nGeo.polygonArea = function (polygon) {\n    if (!polygon) {\n        return;\n    }\n    return Geo.polygonRingArea(polygon[0]);\n};\n\nGeo.multiPolygonArea = function (polygons) {\n    let area = 0;\n\n    for (let p=0; p < polygons.length; p++) {\n        area += Geo.polygonArea(polygons[p]);\n    }\n\n    return area;\n};\n\nGeo.ringWinding = function (ring) {\n    let area = Geo.signedPolygonRingAreaSum(ring);\n    if (area > 0) {\n        return 'CW';\n    }\n    else if (area < 0) {\n        return 'CCW';\n    }\n    // return undefined on zero area polygon\n};\n",
     "// WebGL constants - need to import these separately to make them available in the web worker\n\nvar gl;\nexport default gl = {};\n\n/* DataType */\ngl.BYTE                           = 0x1400;\ngl.UNSIGNED_BYTE                  = 0x1401;\ngl.SHORT                          = 0x1402;\ngl.UNSIGNED_SHORT                 = 0x1403;\ngl.INT                            = 0x1404;\ngl.UNSIGNED_INT                   = 0x1405;\ngl.FLOAT                          = 0x1406;\n",
     "// WebGL context wrapper\n\nvar Context;\nexport default Context = {};\n\nlet context_id = 0;\n\n// Setup a WebGL context\n// If no canvas element is provided, one is created and added to the document body\nContext.getContext = function getContext (canvas, options)\n{\n    var fullscreen = false;\n    if (canvas == null) {\n        canvas = document.createElement('canvas');\n        canvas.style.position = 'absolute';\n        canvas.style.top = 0;\n        canvas.style.left = 0;\n        canvas.style.zIndex = -1;\n        document.body.appendChild(canvas);\n        fullscreen = true;\n    }\n\n    var gl = canvas.getContext('webgl', options) || canvas.getContext('experimental-webgl', options);\n    if (!gl) {\n        throw new Error(\"Couldn't create WebGL context.\");\n    }\n    gl._tangram_id = context_id++;\n\n    if (!fullscreen) {\n        Context.resize(gl, parseFloat(canvas.style.width), parseFloat(canvas.style.height), options.device_pixel_ratio);\n    }\n    else {\n        Context.resize(gl, window.innerWidth, window.innerHeight, options.device_pixel_ratio);\n        window.addEventListener('resize', function () {\n            Context.resize(gl, window.innerWidth, window.innerHeight, options.device_pixel_ratio);\n        });\n    }\n\n    return gl;\n};\n\nContext.resize = function (gl, width, height, device_pixel_ratio)\n{\n    device_pixel_ratio = device_pixel_ratio || window.devicePixelRatio || 1;\n    gl.canvas.style.width = width + 'px';\n    gl.canvas.style.height = height + 'px';\n    gl.canvas.width = Math.round(width * device_pixel_ratio);\n    gl.canvas.height = Math.round(height * device_pixel_ratio);\n    gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n    gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);\n};\n",
     "// WebGL extension wrapper\n// Stores extensions by name and GL context\n\n// list of extension arrays, for each entry, 1st element GL context, 2nd map of extensions by name\nlet extensions = [];\n\nexport default function getExtension (gl, name) {\n    let exts = extensions.filter(e => e[0] === gl)[0];\n    exts = exts && exts[1];\n\n    if (!exts) {\n        extensions.push([gl, {}]);\n        exts = extensions[extensions.length-1][1];\n    }\n\n    if (!exts[name]) {\n        exts[name] = gl.getExtension(name);\n    }\n    return exts[name];\n}\n",
     "var GLSL = {};\nexport default GLSL;\n\n/**\n    Parse uniforms from a JS object, infers types and returns an array of objects with the\n    necessary information to set uniform values on a GL program. Each object in the returned\n    array has the form:\n    { type, method, name, value }\n\n    type: the GL uniform type, such as 'vec3', 'float', etc.\n    method: the GL uniform setter method to use, such as '1f', '3fv', etc.\n    name: the fully qualified name of the GL uniform location, e.g. 'array[0].field', etc.\n    value: the value to be passed to the GL uniform setter for that type, e.g. [1, 2, 3] for a vec3\n\n    Textures have special behavior: uniforms with string values are treated as textures, and\n    the string is used as a unique texture 'key' to be interpreted by the caller (which is responsible\n    for actually setting the uniforms). For example, this could be used as a key into a dictionary of\n    known texture names, or it could simply be used as a URL to dynamically load the texture from.\n*/\nGLSL.parseUniforms = function (uniforms) {\n    var parsed = [];\n\n    for (var name in uniforms) {\n        var key = name; // save the original name\n        var uniform = uniforms[name];\n        var u;\n\n        // Single float\n        if (typeof uniform === 'number') {\n            parsed.push({\n                type: 'float',\n                method: '1f',\n                name,\n                value: uniform,\n                key,\n                uniforms\n            });\n        }\n        // Array: vector, array of floats, array of textures\n        else if (Array.isArray(uniform)) {\n            // Numeric values\n            if (typeof uniform[0] === 'number') {\n                // float vectors (vec2, vec3, vec4)\n                if (uniform.length >= 2 && uniform.length <= 4) {\n                    parsed.push({\n                        type: 'vec' + uniform.length,\n                        method: uniform.length + 'fv',\n                        name,\n                        value: uniform,\n                        key,\n                        uniforms\n                    });\n                }\n                // float array\n                else if (uniform.length > 4) {\n                    parsed.push({\n                        type: 'float[]',\n                        method: '1fv',\n                        name: name + '[0]',\n                        value: uniform,\n                        key,\n                        uniforms\n                    });\n                }\n                // TODO: assume matrix for (typeof == Float32Array && length == 16)?\n            }\n            // Array of textures\n            else if (typeof uniform[0] === 'string') {\n                for (u=0; u < uniform.length; u++) {\n                    parsed.push({\n                        type: 'sampler2D',\n                        method: '1i',\n                        name: name + '[' + u + ']',\n                        value: uniform[u],\n                        key: u,\n                        uniforms: uniform\n                    });\n                }\n            }\n            // Array of arrays - but only arrays of vectors are allowed in this case\n            else if (Array.isArray(uniform[0]) && typeof uniform[0][0] === 'number') {\n                // float vectors (vec2, vec3, vec4)\n                if (uniform[0].length >= 2 && uniform[0].length <= 4) {\n                    // Set each vector in the array\n                    for (u=0; u < uniform.length; u++) {\n                        parsed.push({\n                            type: 'vec' + uniform[0].length,\n                            method: uniform[u].length + 'fv',\n                            name: name + '[' + u + ']',\n                            value: uniform[u],\n                            key: u,\n                            uniforms: uniform\n                        });\n                    }\n                }\n            }\n            // TODO: else warning\n        }\n        // Boolean\n        else if (typeof uniform === 'boolean') {\n            parsed.push({\n                type: 'bool',\n                method: '1i',\n                name,\n                value: uniform,\n                key,\n                uniforms\n            });\n        }\n        // Texture\n        else if (typeof uniform === 'string') {\n            parsed.push({\n                type: 'sampler2D',\n                method: '1i',\n                name,\n                value: uniform,\n                key,\n                uniforms\n            });\n        }\n    }\n\n    return parsed;\n};\n\n/**\n    Generate a GLSL variable definition from a JS object\n*/\nGLSL.defineVariable = function (name, value) {\n    var type, array;\n\n    // Single float\n    if (typeof value === 'number') {\n        type = 'float';\n    }\n    // Multiple floats - vector or array\n    else if (Array.isArray(value)) {\n        // Numeric values\n        if (typeof value[0] === 'number') {\n            // float vectors (vec2, vec3, vec4)\n            if (value.length >= 2 && value.length <= 4) {\n                type = 'vec' + value.length;\n            }\n            // float array\n            else { //if (value.length > 4) {\n                type = 'float';\n                array = value.length;\n            }\n            // TODO: assume matrix for (typeof == Float32Array && length == 16)?\n        }\n        // Array of textures\n        else if (typeof value[0] === 'string') {\n            type = 'sampler2D';\n            array = value.length;\n        }\n    }\n    // Boolean\n    else if (typeof value === 'boolean') {\n        type = 'bool';\n    }\n    // Texture\n    else if (typeof value === 'string') {\n        type = 'sampler2D';\n    }\n    else {\n        return; // no valid type found\n    }\n\n    // Construct variable definition\n    var variable = '';\n    variable += `${type} ${name}`;\n    if (array) {\n        variable += `[${array}]`;\n    }\n    variable += ';\\n';\n\n    return variable;\n};\n\n/**\n    Generate a GLSL uniform definition from a JS object\n*/\nGLSL.defineUniform = function (name, value) {\n    var def = GLSL.defineVariable(name, value);\n    if (!def) {\n        return;\n    }\n    return 'uniform ' + def;\n};\n\n/**\n    Check for a uniform definition of 'name' in the provided GLSL source\n    Simple regex check for 'uniform' keyword and var name, does not attempt to parse/extract GLSL\n    NOTE: assumes comments have been stripped from source\n*/\nGLSL.isUniformDefined = function (name, source) {\n    // Match, in order:\n    // - the keyword 'uniform'\n    // - at least one character that is anything except a semicolon, ;\n    // - optionally, anything enclosed in curly braces, { ... } (an inline structure definition can go here)\n    // - optionally, any # of characters that is not a semicolon, ;\n    // - the name of the uniform\n\n    var re = new RegExp('uniform[^;]+(?:{[\\\\s\\\\S]*})?[^;]*\\\\b' + name + '\\\\b', 'g');\n    if (source.match(re)) {\n        return true;\n    }\n    return false;\n};\n\n/**\n    Check that a symbol is referenced in the GLSL source\n    NOTE: assumes comments have been stripped from source\n*/\nGLSL.isSymbolReferenced = function (name, source) {\n    var re = new RegExp('\\\\b' + name + '\\\\b', 'g');\n    if (source.search(re) >= 0) {\n        return true;\n    }\n    return false;\n};\n\n/**\n    Expand a single value or 2-element array into a 3-element array, with the last ( z )\n    coordinate defaulting to 1 (with option to specify). Also runs parseFloat to try to maintain\n    data integrity. Returns null if input couldn't be parsed.\n*/\nGLSL.expandVec3 = function (v, z = 1) {\n    let x;\n    if (Array.isArray(v)) {\n        if (v.length === 2) {\n            x = [...v, z].map(parseFloat);\n        }\n        else {\n            return v;\n        }\n    }\n    else {\n        x = [v, v, v].map(parseFloat);\n    }\n\n    if (x && x.every(n => typeof n === 'number' && !isNaN(n))) {\n        return x;\n    }\n};\n\n/**\n    Expand a single value or 3-element array into a 4-element array, with the last (e.g. w or a)\n    coordinate defaulting to 1 (with option to specify). Also runs parseFloat to try to maintain\n    data integrity. Returns null if input couldn't be parsed.\n*/\nGLSL.expandVec4 = function (v, w = 1) {\n    let x;\n    if (Array.isArray(v)) {\n        if (v.length === 3) {\n            x = [...v, w].map(parseFloat);\n        }\n        else {\n            return v;\n        }\n    }\n    else {\n        x = [v, v, v, w].map(parseFloat);\n    }\n\n    if (x && x.every(n => typeof n === 'number' && !isNaN(n))) {\n        return x;\n    }\n};\n\n\n",
     "\nexport class RenderState {\n\tconstructor (value, setup) {\n        setup(value);\n        this.value = value;\n        this.setup = setup;\n    }\n\n    set (value) {\n    \t// if the states are different, call the GL context for a state change\n    \tif (JSON.stringify(this.value) !== JSON.stringify(value)) {\n    \t\tthis.setup(value);\n    \t\tthis.value = value;\n    \t}\n    }\n}\n\nexport default class RenderStateManager {\n\n    constructor (gl) {\n        this.defaults = {};\n\n        // Culling\n        this.defaults.culling = true;\n        this.defaults.culling_face = gl.BACK;\n\n        // Blending\n        this.defaults.blending = false;\n        this.defaults.blending_src = gl.ONE_MINUS_SRC_ALPHA;\n        this.defaults.blending_dst = gl.ONE_MINUS_SRC_ALPHA;\n        this.defaults.blending_src_alpha = gl.ONE;\n        this.defaults.blending_dst_alpha = gl.ONE_MINUS_SRC_ALPHA;\n\n        // Depth test/write\n        this.defaults.depth_write = true;\n        this.defaults.depth_test = true;\n        gl.depthFunc(gl.LESS); // depth function only needs to be set once\n\n    \t// Culling\n        this.culling = new RenderState(\n            { cull: this.defaults.culling, face: this.defaults.culling_face },\n    \t\t(value) => {\n    \t\t\tif (value.cull) {\n    \t\t\t\tgl.enable(gl.CULL_FACE);\n            \t\tgl.cullFace(value.face);\n    \t\t\t} else {\n    \t\t\t\tgl.disable(gl.CULL_FACE);\n    \t\t\t}\n    \t\t}\n    \t);\n\n    \t// Blending mode\n        this.blending = new RenderState({\n                blend: this.defaults.blending,\n                src: this.defaults.blending_src,\n                dst: this.defaults.blending_dst,\n                src_alpha: this.defaults.blending_src_alpha,\n                dst_alpha: this.defaults.blending_dst_alpha\n            },\n            (value) => {\n    \t\t\tif (value.blend) {\n            \t\tgl.enable(gl.BLEND);\n\n                    if (value.src_alpha && value.dst_alpha) {\n                        gl.blendFuncSeparate(value.src, value.dst, value.src_alpha, value.dst_alpha);\n                    }\n                    else {\n                        gl.blendFunc(value.src, value.dst);\n                    }\n    \t\t\t} else {\n    \t\t\t\tgl.disable(gl.BLEND);\n    \t\t\t}\n    \t\t}\n    \t);\n\n    \t// Depth write\n        this.depth_write = new RenderState(\n            { depth_write: this.defaults.depth_write },\n    \t\t(value) => {\n        \t\tgl.depthMask(value.depth_write);\n    \t\t}\n    \t);\n\n    \t// Depth test\n        this.depth_test = new RenderState(\n            { depth_test: this.defaults.depth_test },\n            (value) => {\n    \t\t\tif (value.depth_test) {\n            \t\tgl.enable(gl.DEPTH_TEST);\n    \t\t\t} else {\n            \t\tgl.disable(gl.DEPTH_TEST);\n    \t\t\t}\n    \t\t}\n    \t);\n\n    }\n\n}\n",
     "// GL program wrapper to cache uniform locations/values, do compile-time pre-processing\n// (injecting #defines and #pragma blocks into shaders), etc.\n\nimport log from '../utils/log';\nimport GLSL from './glsl';\nimport Texture from './texture';\nimport getExtension from './extensions';\nimport hashString from '../utils/hash';\n\nimport strip from 'strip-comments';\nimport { default as parseShaderErrors } from 'gl-shader-errors';\n\n// Regex patterns\nconst re_pragma = /^\\s*#pragma.*$/gm;   // for removing unused pragmas after shader block injection\nconst re_continue_line = /\\\\\\s*\\n/mg;   // for removing backslash line continuations\n\nexport default class ShaderProgram {\n\n    constructor(gl, vertex_source, fragment_source, options) {\n        options = options || {};\n\n        this.gl = gl;\n        this.program = null;\n        this.compiled = false;\n        this.compiling = false;\n        this.error = null;\n\n        // key/values inserted as #defines into shaders at compile-time\n        this.defines = Object.assign({}, options.defines||{});\n\n        // key/values for blocks that can be injected into shaders at compile-time\n        this.blocks = Object.assign({}, options.blocks||{});\n        this.block_scopes = Object.assign({}, options.block_scopes||{});\n\n        // list of extensions to activate\n        this.extensions = options.extensions || [];\n\n        // JS-object uniforms that are expected by this program\n        // If they are not found in the existing shader source, their types will be inferred and definitions\n        // for each will be injected.\n        this.dependent_uniforms = options.uniforms;\n\n        this.uniforms = {}; // program locations of uniforms, lazily added as each uniform is set\n        this.attribs = {}; // program locations of vertex attributes, lazily added as each attribute is accessed\n\n        this.vertex_source = vertex_source;\n        this.fragment_source = fragment_source;\n\n        this.id = ShaderProgram.id++;\n        this.name = options.name; // can provide a program name (useful for debugging)\n    }\n\n    destroy() {\n        this.gl.useProgram(null);\n        this.gl.deleteProgram(this.program);\n        this.program = null;\n        this.uniforms = {};\n        this.attribs = {};\n        this.compiled = false;\n    }\n\n    // Use program wrapper with simple state cache\n    use() {\n        if (!this.compiled) {\n            return;\n        }\n\n        if (ShaderProgram.current !== this) {\n            this.gl.useProgram(this.program);\n        }\n        ShaderProgram.current = this;\n    }\n\n    compile() {\n        if (this.compiling) {\n            throw(new Error(`ShaderProgram.compile(): skipping for ${this.id} (${this.name}) because already compiling`));\n        }\n        this.compiling = true;\n        this.compiled = false;\n        this.error = null;\n\n        // Copy sources from pre-modified template\n        this.computed_vertex_source = this.vertex_source;\n        this.computed_fragment_source = this.fragment_source;\n\n        // Check for extension availability\n        let extensions = this.checkExtensions();\n\n        // Make list of defines to be injected later\n        var defines = this.buildDefineList();\n\n        // Inject user-defined blocks (arbitrary code points matching named #pragmas)\n        // Replace according to this pattern:\n        // #pragma tangram: [key]\n        // e.g. #pragma tangram: global\n\n        // Gather all block code snippets\n        var blocks = this.buildShaderBlockList();\n        var regexp;\n\n        for (var key in blocks) {\n            var block = blocks[key];\n            if (!block || (Array.isArray(block) && block.length === 0)) {\n                continue;\n            }\n\n            // First find code replace points in shaders\n            regexp = new RegExp('^\\\\s*#pragma\\\\s+tangram:\\\\s+' + key + '\\\\s*$', 'm');\n            var inject_vertex = this.computed_vertex_source.match(regexp);\n            var inject_fragment = this.computed_fragment_source.match(regexp);\n\n            // Avoid network request if nothing to replace\n            if (inject_vertex == null && inject_fragment == null) {\n                continue;\n            }\n\n            // Combine all blocks into one string\n            var source = '';\n            block.forEach(val => {\n                // Mark start and end of each block with metadata (which can be extracted from\n                // final source for error handling, debugging, etc.)\n                let mark = `${val.scope}, ${val.key}, ${val.num}`;\n                source += `\\n// tangram-block-start: ${mark}\\n`;\n                source += val.source;\n                source += `\\n// tangram-block-end: ${mark}\\n`;\n            });\n\n            // Inject\n            if (inject_vertex != null) {\n                this.computed_vertex_source = this.computed_vertex_source.replace(regexp, source);\n            }\n            if (inject_fragment != null) {\n                this.computed_fragment_source = this.computed_fragment_source.replace(regexp, source);\n            }\n\n            // Add a #define for this injection point\n            defines['TANGRAM_BLOCK_' + key.replace(/[\\s-]+/g, '_').toUpperCase()] = true;\n        }\n\n        // Clean-up any #pragmas that weren't replaced (to prevent compiler warnings)\n        this.computed_vertex_source = this.computed_vertex_source.replace(re_pragma, '');\n        this.computed_fragment_source = this.computed_fragment_source.replace(re_pragma, '');\n\n        // Detect uniform definitions, inject any missing ones\n        this.ensureUniforms(this.dependent_uniforms);\n\n        // Build & inject extensions & defines\n        // This is done *after* code injection so that we can add defines for which code points were injected\n        let precision = '';\n        let high = this.gl.getShaderPrecisionFormat(this.gl.FRAGMENT_SHADER, this.gl.HIGH_FLOAT);\n        if (high && high.precision > 0) {\n            precision = 'precision highp float;\\n';\n        }\n        else {\n            precision = 'precision mediump float;\\n';\n        }\n\n        defines['TANGRAM_VERTEX_SHADER'] = true;\n        defines['TANGRAM_FRAGMENT_SHADER'] = false;\n        this.computed_vertex_source =\n            precision +\n            ShaderProgram.buildDefineString(defines) +\n            this.computed_vertex_source;\n\n        // Precision qualifier only valid in fragment shader\n        // NB: '#extension' statements added to fragment shader only, as IE11 throws error when they appear in\n        // vertex shader (even when guarded by #ifdef), and no WebGL extensions require '#extension' in vertex shaders\n        defines['TANGRAM_VERTEX_SHADER'] = false;\n        defines['TANGRAM_FRAGMENT_SHADER'] = true;\n        this.computed_fragment_source =\n            ShaderProgram.buildExtensionString(extensions) +\n            precision +\n            ShaderProgram.buildDefineString(defines) +\n            this.computed_fragment_source;\n\n        // Replace multi-line backslashes\n        this.computed_vertex_source = this.computed_vertex_source.replace(re_continue_line, '');\n        this.computed_fragment_source = this.computed_fragment_source.replace(re_continue_line, '');\n\n        // Compile & set uniforms to cached values\n        try {\n            this.program = ShaderProgram.updateProgram(this.gl, this.program, this.computed_vertex_source, this.computed_fragment_source);\n            this.compiled = true;\n            this.compiling = false;\n        }\n        catch(error) {\n            this.program = null;\n            this.compiled = false;\n            this.compiling = false;\n            this.error = error;\n\n            // shader error info\n            if (error.type === 'vertex' || error.type === 'fragment') {\n                this.shader_errors = error.errors;\n                this.shader_errors.forEach(e => {\n                    e.type = error.type;\n                    e.block = this.block(error.type, e.line);\n                });\n            }\n\n            throw(new Error(`ShaderProgram.compile(): program ${this.id} (${this.name}) error:`, error));\n        }\n\n        // Discard shader sources after successful compilation\n        this.computed_vertex_source = null;\n        this.computed_fragment_source = null;\n\n        this.use();\n        this.refreshUniforms();\n        this.refreshAttributes();\n    }\n\n    // Make list of defines (global, then program-specific)\n    buildDefineList() {\n        var d, defines = {};\n        for (d in ShaderProgram.defines) {\n            defines[d] = ShaderProgram.defines[d];\n        }\n        for (d in this.defines) {\n            defines[d] = this.defines[d];\n        }\n        return defines;\n    }\n\n    // Make list of shader blocks (global, then program-specific)\n    buildShaderBlockList() {\n        let key, blocks = {};\n\n        // Global blocks\n        for (key in ShaderProgram.blocks) {\n            blocks[key] = [];\n\n            if (Array.isArray(ShaderProgram.blocks[key])) {\n                blocks[key].push(\n                    ...ShaderProgram.blocks[key].map((source, num) => {\n                        return { key, source, num, scope: 'ShaderProgram' };\n                    })\n                );\n            }\n            else {\n                blocks[key] = [{ key, source: ShaderProgram.blocks[key], num: 0, scope: 'ShaderProgram' }];\n            }\n        }\n\n        // Program-specific blocks\n        for (key in this.blocks) {\n            blocks[key] = blocks[key] || [];\n\n            if (Array.isArray(this.blocks[key])) {\n                let scopes = (this.block_scopes && this.block_scopes[key]) || [];\n                let cur_scope = null, num = 0;\n\n                for (let b=0; b < this.blocks[key].length; b++) {\n                    // Count blocks relative to current scope\n                    if (scopes[b] !== cur_scope) {\n                        cur_scope = scopes[b];\n                        num = 0;\n                    }\n\n                    blocks[key].push({\n                        key,\n                        source: this.blocks[key][b],\n                        num,\n                        scope: cur_scope || this.name\n                    });\n\n                    num++;\n                }\n            }\n            else {\n                // TODO: address discrepancy in array vs. single-value blocks\n                // styles assume array when tracking block scopes\n                blocks[key].push({ key, source: this.blocks[key], num: 0, scope: this.name });\n            }\n        }\n        return blocks;\n    }\n\n    // Detect uniform definitions, inject any missing ones\n    ensureUniforms(uniforms) {\n        if (!uniforms) {\n            return;\n        }\n\n        var vs = strip(this.computed_vertex_source);\n        var fs = strip(this.computed_fragment_source);\n        var inject, vs_injections = [], fs_injections = [];\n\n        // Check for missing uniform definitions\n        for (var name in uniforms) {\n            let vs_defined = GLSL.isUniformDefined(name, vs); // check vertex shader\n            let fs_defined = GLSL.isUniformDefined(name, fs); // check fragment shader\n\n            if (!vs_defined || !fs_defined) {\n                inject = GLSL.defineUniform(name, uniforms[name]);\n                if (!inject) {\n                    continue;\n                }\n\n                if (!vs_defined) {\n                    log('trace', `Program ${this.name}: ${name} not defined in vertex shader, injecting: '${inject}'`);\n                    vs_injections.push(inject);\n                }\n\n                if (!fs_defined) {\n                    log('trace', `Program ${this.name}: ${name} not defined in fragment shader, injecting: '${inject}'`);\n                    fs_injections.push(inject);\n                }\n            }\n        }\n\n        // Inject missing uniforms\n        // NOTE: these are injected at the very top of the shaders, even before any #defines or #pragmas are added\n        // this could cause some issues with certain #pragmas, or other functions that might expect #defines\n        if (vs_injections.length > 0) {\n            this.computed_vertex_source = vs_injections.join('\\n') + this.computed_vertex_source;\n        }\n\n        if (fs_injections.length > 0) {\n            this.computed_fragment_source = fs_injections.join('\\n') + this.computed_fragment_source;\n        }\n    }\n\n    // Set uniforms from a JS object, with inferred types\n    setUniforms(uniforms, reset_texture_unit = true) {\n        if (!this.compiled) {\n            return;\n        }\n\n        // TODO: only update uniforms when changed\n\n        // Texture units must be tracked and incremented each time a texture sampler uniform is set.\n        // By default, the texture unit is reset to 0 each time setUniforms is called, but they can\n        // also be preserved, for example in cases where multiple calls to setUniforms are expected\n        // (e.g. program-specific uniforms followed by mesh-specific ones).\n        if (reset_texture_unit) {\n            this.texture_unit = 0;\n        }\n\n        // Parse uniform types and values from the JS object\n        const parsed = GLSL.parseUniforms(uniforms);\n\n        // Set each uniform\n        for (let u=0; u < parsed.length; u++) {\n            const uniform = parsed[u];\n            if (uniform.type === 'sampler2D') {\n                // For textures, we need to track texture units, so we have a special setter\n                this.setTextureUniform(uniform.name, uniform.value);\n            }\n            else {\n                this.uniform(uniform.method, uniform.name, uniform.value);\n            }\n        }\n    }\n\n    // Cache some or all uniform values so they can be restored\n    saveUniforms(subset) {\n        let uniforms = subset || this.uniforms;\n        for (let u in uniforms) {\n            let uniform = this.uniforms[u];\n            if (uniform) {\n                uniform.saved_value = uniform.value;\n            }\n        }\n        this.saved_texture_unit = this.texture_unit || 0;\n    }\n\n    // Restore some or all uniforms to saved values\n    restoreUniforms(subset) {\n        let uniforms = subset || this.uniforms;\n        for (let u in uniforms) {\n            let uniform = this.uniforms[u];\n            if (uniform && uniform.saved_value) {\n                uniform.value = uniform.saved_value;\n                this.updateUniform(uniform);\n            }\n        }\n        this.texture_unit = this.saved_texture_unit || 0;\n    }\n\n    // Set a texture uniform, finds texture by name or creates a new one\n    setTextureUniform(uniform_name, texture_name) {\n        var texture = Texture.textures[texture_name];\n        if (texture == null) {\n            log('warn', `Cannot find texture '${texture_name}'`);\n            return;\n        }\n\n        texture.bind(this.texture_unit);\n        this.uniform('1i', uniform_name, this.texture_unit);\n        this.texture_unit++; // TODO: track max texture units and log/throw errors\n    }\n\n    // ex: program.uniform('3fv', 'position', [x, y, z]);\n    // TODO: only update uniforms when changed\n    uniform(method, name, value) { // 'value' is a method-appropriate arguments list\n        if (!this.compiled) {\n            return;\n        }\n\n        this.uniforms[name] = this.uniforms[name] || {};\n        let uniform = this.uniforms[name];\n        uniform.name = name;\n        if (uniform.location === undefined) {\n            uniform.location = this.gl.getUniformLocation(this.program, name);\n        }\n        uniform.method = method;\n        uniform.value = value;\n        this.updateUniform(uniform);\n    }\n\n    // Set a single uniform\n    updateUniform(uniform) {\n        if (!this.compiled) {\n            return;\n        }\n\n        if (!uniform || uniform.location == null) {\n            return;\n        }\n\n        this.use();\n        this.commitUniform(uniform);\n    }\n\n    // Commits the uniform to the GPU\n    commitUniform(uniform){\n        let location = uniform.location;\n        let value = uniform.value;\n\n        switch (uniform.method) {\n            case '1i':\n                this.gl.uniform1i(location, value);\n                break;\n            case '1f':\n                this.gl.uniform1f(location, value);\n                break;\n            case '2f':\n                this.gl.uniform2f(location, value[0], value[1]);\n                break;\n            case '3f':\n                this.gl.uniform3f(location, value[0], value[1], value[2]);\n                break;\n            case '4f':\n                this.gl.uniform4f(location, value[0], value[1], value[2], value[3]);\n                break;\n            case '1iv':\n                this.gl.uniform1iv(location, value);\n                break;\n            case '3iv':\n                this.gl.uniform3iv(location, value);\n                break;\n            case '1fv':\n                this.gl.uniform1fv(location, value);\n                break;\n            case '2fv':\n                this.gl.uniform2fv(location, value);\n                break;\n            case '3fv':\n                this.gl.uniform3fv(location, value);\n                break;\n            case '4fv':\n                this.gl.uniform4fv(location, value);\n                break;\n            case 'Matrix3fv':\n                this.gl.uniformMatrix3fv(location, false, value);\n                break;\n            case 'Matrix4fv':\n                this.gl.uniformMatrix4fv(location, false, value);\n                break;\n        }\n    }\n\n    // Refresh uniform locations and set to last cached values\n    refreshUniforms() {\n        if (!this.compiled) {\n            return;\n        }\n\n        for (var u in this.uniforms) {\n            let uniform = this.uniforms[u];\n            uniform.location = this.gl.getUniformLocation(this.program, u);\n            this.updateUniform(uniform);\n        }\n    }\n\n    refreshAttributes() {\n        // var len = this.gl.getProgramParameter(this.program, this.gl.ACTIVE_ATTRIBUTES);\n        // for (var i=0; i < len; i++) {\n        //     var a = this.gl.getActiveAttrib(this.program, i);\n        // }\n        this.attribs = {};\n    }\n\n    // Get the location of a vertex attribute\n    attribute(name) {\n        if (!this.compiled) {\n            return;\n        }\n\n        var attrib = (this.attribs[name] = this.attribs[name] || {});\n        if (attrib.location != null) {\n            return attrib;\n        }\n\n        attrib.name = name;\n        attrib.location = this.gl.getAttribLocation(this.program, name);\n\n        // var info = this.gl.getActiveAttrib(this.program, attrib.location);\n        // attrib.type = info.type;\n        // attrib.size = info.size;\n\n        return attrib;\n    }\n\n    // Get shader source as string\n    source(type) {\n        if (type === 'vertex') {\n            return this.computed_vertex_source;\n        }\n        else if (type === 'fragment') {\n            return this.computed_fragment_source;\n        }\n    }\n\n    // Get shader source as array of line strings\n    lines(type) {\n        let source = this.source(type);\n        if (source) {\n            return source.split('\\n');\n        }\n        return [];\n    }\n\n    // Get a specific line from shader source\n    line(type, num) {\n        let source = this.lines(type);\n        if (source) {\n            return source[num];\n        }\n    }\n\n    // Get info on which shader block (if any) a particular line number in a shader is in\n    // Returns an object with the following info if a block is found: { name, line, source }\n    //  scope: where the shader block originated, either a style name, or global such as ShaderProgram\n    //  name: shader block name (e.g. 'color', 'position', 'global')\n    //  num: the block number *within* local scope (e.g. if a style has multiple 'color' blocks)\n    //  line: line number *within* the shader block (not the whole shader program), useful for error highlighting\n    //  source: the code for the line\n    // NOTE: this does a bruteforce loop over the shader source and looks for shader block start/end markers\n    // We could track line ranges for shader blocks as they are inserted, but as this code is only used for\n    // error handling on compilation failure, it was simpler to keep it separate than to burden the core\n    // compilation path.\n    block(type, num) {\n        let lines = this.lines(type);\n        let block;\n        for (let i=0; i < num && i < lines.length; i++) {\n            let line = lines[i];\n            let match = line.match(/\\/\\/ tangram-block-start: ([A-Za-z0-9_-]+), ([A-Za-z0-9_-]+), (\\d+)/);\n            if (match && match.length > 1) {\n                // mark current block\n                block = {\n                    scope: match[1],\n                    name: match[2],\n                    num: match[3]\n                };\n            }\n            else {\n                match = line.match(/\\/\\/ tangram-block-end: ([A-Za-z0-9_-]+), ([A-Za-z0-9_-]+), (\\d+)/);\n                if (match && match.length > 1) {\n                    block = null; // clear current block\n                }\n            }\n\n            // update line # and content\n            if (block) {\n                // init to -1 so that line 0 is first actual line of block code, after comment marker\n                block.line = (block.line == null) ? -1 : block.line + 1;\n                block.source = line;\n            }\n        }\n        return block;\n    }\n\n    // Returns list of available extensions from those requested\n    // Sets internal #defines indicating availability of each requested extension\n    checkExtensions() {\n        let exts = [];\n        this.extensions.forEach(name => {\n            let ext = getExtension(this.gl, name);\n            let def = `TANGRAM_EXTENSION_${name}`;\n\n            this.defines[def] = (ext != null);\n\n            if (ext) {\n                exts.push(name);\n            }\n            else {\n                log('debug', `Could not enable extension '${name}'`);\n            }\n        });\n        return exts;\n    }\n\n}\n\n\n// Static methods and state\nShaderProgram.id = 0;                   // assign each program a unique id\nShaderProgram.current = null;           // currently bound program\n\n// Global config applied to all programs (duplicate properties for a specific program will take precedence)\nShaderProgram.defines = {};\nShaderProgram.blocks = {};\n\n// Reset program and shader caches\nShaderProgram.reset = function () {\n    ShaderProgram.programs_by_source = {};  // GL program objects by exact vertex + fragment shader source\n    ShaderProgram.shaders_by_source = {};   // GL shader objects by exact source\n};\nShaderProgram.reset();\n\n// Turn an object of key/value pairs into single string of #define statements\nShaderProgram.buildDefineString = function (defines) {\n    var define_str = \"\";\n    for (var d in defines) {\n        if (defines[d] == null || defines[d] === false) {\n            continue;\n        }\n        else if (typeof defines[d] === 'boolean' && defines[d] === true) { // booleans are simple defines with no value\n            define_str += \"#define \" + d + \"\\n\";\n        }\n        else if (typeof defines[d] === 'number' && Math.floor(defines[d]) === defines[d]) { // int to float conversion to satisfy GLSL floats\n            define_str += \"#define \" + d + \" \" + defines[d].toFixed(1) + \"\\n\";\n        }\n        else { // any other float or string value\n            define_str += \"#define \" + d + \" \" + defines[d] + \"\\n\";\n        }\n    }\n    return define_str;\n};\n\n// Turn a list of extension names into single string of #extension statements\nShaderProgram.buildExtensionString = function (extensions) {\n    extensions = extensions || [];\n    let str = \"\";\n    extensions.forEach(ext => {\n        str += `#ifdef GL_${ext}\\n#extension GL_${ext} : enable\\n#endif\\n`;\n    });\n    return str;\n};\n\nShaderProgram.addBlock = function (key, ...blocks) {\n    ShaderProgram.blocks[key] = ShaderProgram.blocks[key] || [];\n    ShaderProgram.blocks[key].push(...blocks);\n};\n\n// Remove all global shader blocks for a given key\nShaderProgram.removeBlock = function (key) {\n    ShaderProgram.blocks[key] = [];\n};\n\nShaderProgram.replaceBlock = function (key, ...blocks) {\n    ShaderProgram.removeBlock(key);\n    ShaderProgram.addBlock(key, ...blocks);\n};\n\n// Compile & link a WebGL program from provided vertex and fragment shader sources\n// update a program if one is passed in. Create one if not. Alert and don't update anything if the shaders don't compile.\nShaderProgram.updateProgram = function (gl, program, vertex_shader_source, fragment_shader_source) {\n    // Program with this exact vertex and fragment shader sources already cached?\n    let key = hashString(gl._tangram_id + '::' + vertex_shader_source + '::' + fragment_shader_source);\n    if (ShaderProgram.programs_by_source[key]) {\n        log('trace', 'Reusing identical source GL program object');\n        return ShaderProgram.programs_by_source[key];\n    }\n\n    try {\n        var vertex_shader = ShaderProgram.createShader(gl, vertex_shader_source, gl.VERTEX_SHADER);\n        var fragment_shader = ShaderProgram.createShader(gl, fragment_shader_source, gl.FRAGMENT_SHADER);\n    }\n    catch(err) {\n        log('error', err.message);\n        throw err;\n    }\n\n    gl.useProgram(null);\n    if (program != null) {\n        var old_shaders = gl.getAttachedShaders(program);\n        for(var i = 0; i < old_shaders.length; i++) {\n            gl.detachShader(program, old_shaders[i]);\n        }\n    } else {\n        program = gl.createProgram();\n    }\n\n    if (vertex_shader == null || fragment_shader == null) {\n        return program;\n    }\n\n    gl.attachShader(program, vertex_shader);\n    gl.attachShader(program, fragment_shader);\n\n    gl.linkProgram(program);\n\n    // TODO: reference count and delete shader objects when no programs reference them\n\n    if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {\n        let message = new Error(\n            `WebGL program error:\n            VALIDATE_STATUS: ${gl.getProgramParameter(program, gl.VALIDATE_STATUS)}\n            ERROR: ${gl.getError()}\n            --- Vertex Shader ---\n            ${vertex_shader_source}\n            --- Fragment Shader ---\n            ${fragment_shader_source}`);\n\n        let error = { type: 'program', message };\n        log('error', error.message);\n        throw error;\n    }\n\n    ShaderProgram.programs_by_source[key] = program; // cache by exact source\n    return program;\n};\n\n// Compile a vertex or fragment shader from provided source\nShaderProgram.createShader = function (gl, source, stype) {\n    // Program with identical vertex and fragment shader sources already cached?\n    let key = hashString(gl._tangram_id + '::' + source);\n    if (ShaderProgram.shaders_by_source[key]) {\n        log('trace', 'Reusing identical source GL shader object');\n        return ShaderProgram.shaders_by_source[key];\n    }\n\n    let shader = gl.createShader(stype);\n\n    gl.shaderSource(shader, source);\n    gl.compileShader(shader);\n\n    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {\n        let type = (stype === gl.VERTEX_SHADER ? 'vertex' : 'fragment');\n        let message = gl.getShaderInfoLog(shader);\n        let errors = parseShaderErrors(message);\n        throw { type, message, errors };\n    }\n\n    ShaderProgram.shaders_by_source[key] = shader; // cache by exact source\n    return shader;\n};\n",
-    "// Texture management\nimport log from '../utils/log';\nimport Utils from '../utils/utils';\nimport subscribeMixin from '../utils/subscribe';\nimport WorkerBroker from '../utils/worker_broker';\n\n// GL texture wrapper object for keeping track of a global set of textures, keyed by a unique user-defined name\nexport default class Texture {\n\n    constructor(gl, name, options = {}) {\n        this.gl = gl;\n        this.texture = gl.createTexture();\n        if (this.texture) {\n            this.valid = true;\n        }\n        this.bind();\n\n        this.name = name;\n        this.retain_count = 0;\n        this.source = null;\n        this.source_type = null;\n        this.config_type = null;\n        this.loading = null;    // a Promise object to track the loading state of this texture\n        this.loaded = false;    // successfully loaded as expected\n        this.filtering = options.filtering;\n        this.sprites = options.sprites;\n        this.texcoords = {};    // sprite UVs ([0, 1] range)\n        this.sizes = {};        // sprite sizes (pixel size)\n\n        // Default to a 1-pixel black texture so we can safely render while we wait for an image to load\n        // See: http://stackoverflow.com/questions/19722247/webgl-wait-for-texture-to-load\n        this.setData(1, 1, new Uint8Array([0, 0, 0, 255]), { filtering: 'nearest' });\n\n        // Destroy previous texture if present\n        if (Texture.textures[this.name]) {\n            // Preserve previous retain count\n            this.retain_count = Texture.textures[this.name].retain_count;\n            Texture.textures[this.name].retain_count = 0; // allow to be freed\n            Texture.textures[this.name].destroy();\n        }\n\n        // Cache texture instance and definition\n        Texture.textures[this.name] = this;\n        Texture.texture_configs[this.name] = Object.assign({ name }, options);\n\n        this.load(options);\n        log('trace', `creating Texture ${this.name}`);\n    }\n\n    // Destroy a single texture instance\n    destroy({ force } = {}) {\n        if (this.retain_count > 0 && !force) {\n            log('error', `Texture '${this.name}': destroying texture with retain count of '${this.retain_count}'`);\n            return;\n        }\n\n        if (!this.valid) {\n            return;\n        }\n        this.gl.deleteTexture(this.texture);\n        this.texture = null;\n        delete this.data;\n        this.data = null;\n        delete Texture.textures[this.name];\n        this.valid = false;\n        log('trace', `destroying Texture ${this.name}`);\n    }\n\n    retain () {\n        this.retain_count++;\n    }\n\n    release () {\n        if (this.retain_count <= 0) {\n            log('error', `Texture '${this.name}': releasing texture with retain count of '${this.retain_count}'`);\n        }\n\n        this.retain_count--;\n        if (this.retain_count <= 0) {\n            this.destroy();\n        }\n    }\n\n    bind(unit = 0) {\n        if (!this.valid) {\n            return;\n        }\n\n        if (Texture.activeUnit !== unit) {\n            this.gl.activeTexture(this.gl.TEXTURE0 + unit);\n            Texture.activeUnit = unit;\n            Texture.boundTexture = null; // texture must be re-bound when unit changes\n        }\n\n        if (Texture.boundTexture !== this.texture) {\n            this.gl.bindTexture(this.gl.TEXTURE_2D, this.texture);\n            Texture.boundTexture = this.texture;\n        }\n    }\n\n    load(options) {\n        if (!options) {\n            return this.loading || Promise.resolve(this);\n        }\n\n        this.loading = null;\n        if (typeof options.url === 'string') {\n            this.config_type = 'url';\n            this.setUrl(options.url, options);\n        } else if (options.element) {\n            this.config_type = 'element';\n            this.setElement(options.element, options);\n        } else if (options.data && options.width && options.height) {\n            this.config_type = 'data';\n            this.setData(options.width, options.height, options.data, options);\n        }\n\n        this.loading =\n            (this.loading && this.loading.then(() => { this.calculateSprites(); return this; })) ||\n            Promise.resolve(this);\n        return this.loading;\n    }\n\n    // Sets texture from an url\n    setUrl(url, options = {}) {\n        if (!this.valid) {\n            return;\n        }\n\n        this.url = url; // save URL reference (will be overwritten when element is loaded below)\n        this.source = this.url;\n        this.source_type = 'url';\n\n        this.loading = new Promise((resolve, reject) => {\n            let image = new Image();\n            image.onload = () => {\n                try {\n                    this.setElement(image, options);\n                }\n                catch (e) {\n                    this.loaded = false;\n                    log('warn', `Texture '${this.name}': failed to load url: '${this.source}'`, e, options);\n                    Texture.trigger('warning', { message: `Failed to load texture from ${this.source}`, error: e, texture: options });\n                }\n\n                this.loaded = true;\n                resolve(this);\n            };\n            image.onerror = e => {\n                // Warn and resolve on error\n                this.loaded = false;\n                log('warn', `Texture '${this.name}': failed to load url: '${this.source}'`, e, options);\n                Texture.trigger('warning', { message: `Failed to load texture from ${this.source}`, error: e, texture: options });\n                resolve(this);\n            };\n\n            // Safari has a bug loading data-URL images with CORS enabled, so it must be disabled in that case\n            // https://bugs.webkit.org/show_bug.cgi?id=123978\n            if (!(Utils.isSafari() && this.source.slice(0, 5) === 'data:')) {\n                image.crossOrigin = 'anonymous';\n            }\n\n            image.src = this.source;\n        });\n        return this.loading;\n    }\n\n    // Sets texture to a raw image buffer\n    setData(width, height, data, options = {}) {\n        this.width = width;\n        this.height = height;\n\n        this.source = data;\n        this.source_type = 'data';\n\n        // Convert regular array to typed array\n        if (Array.isArray(this.source)) {\n            this.source = new Uint8Array(this.source);\n        }\n\n        this.update(options);\n        this.setFiltering(options);\n\n        this.loaded = true;\n        this.loading = Promise.resolve(this);\n        return this.loading;\n    }\n\n    // Sets the texture to track a element (canvas/image)\n    setElement(element, options) {\n        let el = element;\n\n        // a string element is interpeted as a CSS selector\n        if (typeof element === 'string') {\n            element = document.querySelector(element);\n        }\n\n        if (element instanceof HTMLCanvasElement ||\n            element instanceof HTMLImageElement ||\n            element instanceof HTMLVideoElement) {\n            this.source = element;\n            this.source_type = 'element';\n\n            this.update(options);\n            this.setFiltering(options);\n        }\n        else {\n            this.loaded = false;\n            let msg = `the 'element' parameter (\\`element: ${JSON.stringify(el)}\\`) must be a CSS `;\n            msg += `selector string, or a <canvas>, <image> or <video> object`;\n            log('warn', `Texture '${this.name}': ${msg}`, options);\n            Texture.trigger('warning', { message: `Failed to load texture because ${msg}`, texture: options });\n        }\n\n        this.loaded = true;\n        this.loading = Promise.resolve(this);\n        return this.loading;\n    }\n\n    // Uploads current image or buffer to the GPU (can be used to update animated textures on the fly)\n    update(options = {}) {\n        if (!this.valid) {\n            return;\n        }\n\n        this.bind();\n        this.gl.pixelStorei(this.gl.UNPACK_FLIP_Y_WEBGL, (options.UNPACK_FLIP_Y_WEBGL === false ? false : true));\n        this.gl.pixelStorei(this.gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, options.UNPACK_PREMULTIPLY_ALPHA_WEBGL || false);\n\n        // Image or Canvas element\n        if (this.source instanceof HTMLCanvasElement || this.source instanceof HTMLVideoElement ||\n            (this.source instanceof HTMLImageElement && this.source.complete)) {\n\n            this.width = this.source.width;\n            this.height = this.source.height;\n            this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.gl.RGBA, this.gl.UNSIGNED_BYTE, this.source);\n        }\n        // Raw image buffer\n        else if (this.source_type === 'data') {\n            this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.width, this.height, 0, this.gl.RGBA, this.gl.UNSIGNED_BYTE, this.source);\n        }\n\n        Texture.trigger('update', this);\n    }\n\n    // Determines appropriate filtering mode\n    setFiltering(options = {}) {\n        if (!this.valid) {\n            return;\n        }\n\n        options.filtering = options.filtering || 'linear';\n\n        var gl = this.gl;\n        this.bind();\n\n        // For power-of-2 textures, the following presets are available:\n        // mipmap: linear blend from nearest mip\n        // linear: linear blend from original image (no mips)\n        // nearest: nearest pixel from original image (no mips, 'blocky' look)\n        if (Utils.isPowerOf2(this.width) && Utils.isPowerOf2(this.height)) {\n            this.power_of_2 = true;\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, options.TEXTURE_WRAP_S || (options.repeat && gl.REPEAT) || gl.CLAMP_TO_EDGE);\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, options.TEXTURE_WRAP_T || (options.repeat && gl.REPEAT) || gl.CLAMP_TO_EDGE);\n\n            if (options.filtering === 'mipmap') {\n                this.filtering = 'mipmap';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR); // TODO: use trilinear filtering by defualt instead?\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n                gl.generateMipmap(gl.TEXTURE_2D);\n            }\n            else if (options.filtering === 'linear') {\n                this.filtering = 'linear';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n            }\n            else if (options.filtering === 'nearest') {\n                this.filtering = 'nearest';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n            }\n        }\n        else {\n            // WebGL has strict requirements on non-power-of-2 textures:\n            // No mipmaps and must clamp to edge\n            this.power_of_2 = false;\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n\n            if (options.filtering === 'nearest') {\n                this.filtering = 'nearest';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n            }\n            else { // default to linear for non-power-of-2 textures\n                this.filtering = 'linear';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n            }\n        }\n\n        Texture.trigger('update', this);\n    }\n\n    // Pre-calc sprite regions for a texture sprite in UV [0, 1] space\n    calculateSprites() {\n        if (this.sprites) {\n            for (let s in this.sprites) {\n                let sprite = this.sprites[s];\n\n                // Map [0, 0] to [1, 1] coords to the appropriate sprite sub-area of the texture\n                this.texcoords[s] = Texture.getTexcoordsForSprite(\n                    [sprite[0], sprite[1]],\n                    [sprite[2], sprite[3]],\n                    [this.width, this.height]\n                );\n\n                // Pixel size of sprite\n                this.sizes[s] = [sprite[2], sprite[3]];\n            }\n        }\n    }\n\n}\n\n\n// Static/class methods and state\n\nTexture.create = function (gl, name, options) {\n    return new Texture(gl, name, options);\n};\n\nTexture.retain = function (name) {\n    if (Texture.textures[name]) {\n        Texture.textures[name].retain();\n    }\n};\n\nTexture.release = function (name) {\n    if (Texture.textures[name]) {\n        Texture.textures[name].release();\n    }\n};\n\n// Destroy all texture instances for a given GL context\nTexture.destroy = function (gl) {\n    var textures = Object.keys(Texture.textures);\n    textures.forEach(t => {\n        var texture = Texture.textures[t];\n        if (texture.gl === gl) {\n            texture.destroy({ force: true });\n        }\n    });\n};\n\n// Get sprite pixel size and UVs\nTexture.getSpriteInfo = function (texname, sprite) {\n    let texture = Texture.textures[texname];\n    return texture && { size: texture.sizes[sprite], texcoords: texture.texcoords[sprite] };\n};\n\n// Re-scale UVs from [0, 1] range to a smaller area within the image\nTexture.getTexcoordsForSprite = function (area_origin, area_size, tex_size) {\n    var area_origin_y = tex_size[1] - area_origin[1] - area_size[1];\n\n    return [\n        area_origin[0] / tex_size[0],\n        area_origin_y / tex_size[1],\n        (area_size[0] + area_origin[0]) / tex_size[0],\n        (area_size[1] + area_origin_y) / tex_size[1]\n    ];\n};\n\n// Create a set of textures keyed in an object\n// Optionally load each if it has a URL specified\nTexture.createFromObject = function (gl, textures) {\n    let loading = [];\n    if (textures) {\n        for (let texname in textures) {\n            let config = textures[texname];\n\n            // If texture already exists and definition hasn't changed, no need to re-create\n            // Note: to avoid flicker when other textures/scene items change\n            if (!Texture.changed(texname, config)) {\n                continue;\n            }\n\n            let texture = Texture.create(gl, texname, config);\n            loading.push(texture.loading);\n        }\n    }\n    return Promise.all(loading);\n};\n\n// Create a 'default' texture (1x1 pixel) that can be used as a placeholder\n// (for example to prevent GL from complaining about unbound textures)\nTexture.default = '__default';\nTexture.createDefault = function (gl) {\n    return Texture.create(gl, Texture.default);\n};\n\n// Indicate if a texture definition would be a change from the current cache\nTexture.changed = function (name, config) {\n    let texture = Texture.textures[name];\n    if (texture) { // cached texture\n        // canvas/image-based textures are considered dynamic and always refresh\n        if (texture.config_type === 'element' || config.element != null) {\n            return true;\n        }\n\n        // compare definitions\n        if (JSON.stringify(Texture.texture_configs[name]) ===\n            JSON.stringify(Object.assign({ name }, config))) {\n            return false;\n        }\n    }\n    return true;\n};\n\n// Get metadata for a texture by name\n// Returns via promise, in case texture is still loading\n// Can be called on main thread from worker, to sync texture info to worker\nTexture.getInfo = function (name) {\n    // Get info for all textures by default\n    if (!name) {\n        name = Object.keys(Texture.textures);\n    }\n\n    // Get multiple textures\n    if (Array.isArray(name)) {\n        return Promise.all(name.map(n => Texture.getInfo(n)));\n    }\n\n    // Get single texture\n    var tex = Texture.textures[name];\n    if (tex) {\n        // Wait for this texture to finish loading, or return immediately\n        var loading = tex.loading || Promise.resolve(tex);\n        return loading.then(() => {\n            // Return a subset of texture info\n            // (compatible w/structured cloning, suitable for passing to a worker)\n            return {\n                name: tex.name,\n                width: tex.width,\n                height: tex.height,\n                sprites: tex.sprites,\n                texcoords: tex.texcoords,\n                sizes: tex.sizes,\n                filtering: tex.filtering,\n                power_of_2: tex.power_of_2,\n                valid: tex.valid\n            };\n        });\n    }\n    else {\n        // No texture found\n        return Promise.resolve(null);\n    }\n};\n\n// Sync texture info to worker\n// Called from worker, gets info on one or more textures info from main thread via remote call, then stores it\n// locally in worker. 'textures' can be an array of texture names to sync, or if null, all textures are synced.\nTexture.syncTexturesToWorker = function (names) {\n    return WorkerBroker.postMessage('Texture.getInfo', names).\n        then(textures => {\n            textures.forEach(tex => {\n                Texture.textures[tex.name] = tex;\n            });\n            return Texture.textures;\n        });\n};\n\n// Report max texture size for a GL context\nTexture.getMaxTextureSize = function (gl) {\n    return gl.getParameter(gl.MAX_TEXTURE_SIZE);\n};\n\n// Global set of textures, by name\nTexture.textures = {};\nTexture.texture_configs = {};\nTexture.boundTexture = null;\nTexture.activeUnit = null;\n\nWorkerBroker.addTarget('Texture', Texture);\nsubscribeMixin(Texture);\n",
+    "// Texture management\nimport log from '../utils/log';\nimport Utils from '../utils/utils';\nimport subscribeMixin from '../utils/subscribe';\nimport WorkerBroker from '../utils/worker_broker';\n\n// GL texture wrapper object for keeping track of a global set of textures, keyed by a unique user-defined name\nexport default class Texture {\n\n    constructor(gl, name, options = {}) {\n        this.gl = gl;\n        this.texture = gl.createTexture();\n        if (this.texture) {\n            this.valid = true;\n        }\n        this.bind();\n\n        this.name = name;\n        this.retain_count = 0;\n        this.config_type = null;\n        this.loading = null;    // a Promise object to track the loading state of this texture\n        this.loaded = false;    // successfully loaded as expected\n        this.filtering = options.filtering;\n        this.sprites = options.sprites;\n        this.texcoords = {};    // sprite UVs ([0, 1] range)\n        this.sizes = {};        // sprite sizes (pixel size)\n\n        // Default to a 1-pixel black texture so we can safely render while we wait for an image to load\n        // See: http://stackoverflow.com/questions/19722247/webgl-wait-for-texture-to-load\n        this.setData(1, 1, new Uint8Array([0, 0, 0, 255]), { filtering: 'nearest' });\n\n        // Destroy previous texture if present\n        if (Texture.textures[this.name]) {\n            // Preserve previous retain count\n            this.retain_count = Texture.textures[this.name].retain_count;\n            Texture.textures[this.name].retain_count = 0; // allow to be freed\n            Texture.textures[this.name].destroy();\n        }\n\n        // Cache texture instance and definition\n        Texture.textures[this.name] = this;\n        Texture.texture_configs[this.name] = JSON.stringify(Object.assign({ name }, options));\n\n        this.load(options);\n        log('trace', `creating Texture ${this.name}`);\n    }\n\n    // Destroy a single texture instance\n    destroy({ force } = {}) {\n        if (this.retain_count > 0 && !force) {\n            log('error', `Texture '${this.name}': destroying texture with retain count of '${this.retain_count}'`);\n            return;\n        }\n\n        if (!this.valid) {\n            return;\n        }\n        this.gl.deleteTexture(this.texture);\n        this.texture = null;\n        delete this.data;\n        this.data = null;\n        delete Texture.textures[this.name];\n        delete Texture.texture_configs[this.name];\n        this.valid = false;\n        log('trace', `destroying Texture ${this.name}`);\n    }\n\n    retain () {\n        this.retain_count++;\n    }\n\n    release () {\n        if (this.retain_count <= 0) {\n            log('error', `Texture '${this.name}': releasing texture with retain count of '${this.retain_count}'`);\n        }\n\n        this.retain_count--;\n        if (this.retain_count <= 0) {\n            this.destroy();\n        }\n    }\n\n    bind(unit = 0) {\n        if (!this.valid) {\n            return;\n        }\n\n        if (Texture.activeUnit !== unit) {\n            this.gl.activeTexture(this.gl.TEXTURE0 + unit);\n            Texture.activeUnit = unit;\n            Texture.boundTexture = null; // texture must be re-bound when unit changes\n        }\n\n        if (Texture.boundTexture !== this.texture) {\n            this.gl.bindTexture(this.gl.TEXTURE_2D, this.texture);\n            Texture.boundTexture = this.texture;\n        }\n    }\n\n    load(options) {\n        if (!options) {\n            return this.loading || Promise.resolve(this);\n        }\n\n        this.loading = null;\n        if (typeof options.url === 'string') {\n            this.config_type = 'url';\n            this.setUrl(options.url, options);\n        } else if (options.element) {\n            this.config_type = 'element';\n            this.setElement(options.element, options);\n        } else if (options.data && options.width && options.height) {\n            this.config_type = 'data';\n            this.setData(options.width, options.height, options.data, options);\n        }\n\n        this.loading =\n            (this.loading && this.loading.then(() => { this.calculateSprites(); return this; })) ||\n            Promise.resolve(this);\n        return this.loading;\n    }\n\n    // Sets texture from an url\n    setUrl(url, options = {}) {\n        if (!this.valid) {\n            return;\n        }\n\n        this.url = url; // save URL reference (will be overwritten when element is loaded below)\n\n        this.loading = new Promise((resolve, reject) => {\n            let image = new Image();\n            image.onload = () => {\n                try {\n                    this.setElement(image, options);\n                }\n                catch (e) {\n                    this.loaded = false;\n                    log('warn', `Texture '${this.name}': failed to load url: '${this.url}'`, e, options);\n                    Texture.trigger('warning', { message: `Failed to load texture from ${this.url}`, error: e, texture: options });\n                }\n\n                this.loaded = true;\n                resolve(this);\n            };\n            image.onerror = e => {\n                // Warn and resolve on error\n                this.loaded = false;\n                log('warn', `Texture '${this.name}': failed to load url: '${this.url}'`, e, options);\n                Texture.trigger('warning', { message: `Failed to load texture from ${this.url}`, error: e, texture: options });\n                resolve(this);\n            };\n\n            // Safari has a bug loading data-URL images with CORS enabled, so it must be disabled in that case\n            // https://bugs.webkit.org/show_bug.cgi?id=123978\n            if (!(Utils.isSafari() && this.url.slice(0, 5) === 'data:')) {\n                image.crossOrigin = 'anonymous';\n            }\n\n            image.src = this.url;\n        });\n        return this.loading;\n    }\n\n    // Sets texture to a raw image buffer\n    setData(width, height, data, options = {}) {\n        this.width = width;\n        this.height = height;\n\n        // Convert regular array to typed array\n        if (Array.isArray(data)) {\n            data = new Uint8Array(data);\n        }\n\n        this.update(data, options);\n        this.setFiltering(options);\n\n        this.loaded = true;\n        this.loading = Promise.resolve(this);\n        return this.loading;\n    }\n\n    // Sets the texture to track a element (canvas/image)\n    setElement(element, options) {\n        let el = element;\n\n        // a string element is interpeted as a CSS selector\n        if (typeof element === 'string') {\n            element = document.querySelector(element);\n        }\n\n        if (element instanceof HTMLCanvasElement ||\n            element instanceof HTMLImageElement ||\n            element instanceof HTMLVideoElement) {\n            this.update(element, options);\n            this.setFiltering(options);\n        }\n        else {\n            this.loaded = false;\n            let msg = `the 'element' parameter (\\`element: ${JSON.stringify(el)}\\`) must be a CSS `;\n            msg += `selector string, or a <canvas>, <image> or <video> object`;\n            log('warn', `Texture '${this.name}': ${msg}`, options);\n            Texture.trigger('warning', { message: `Failed to load texture because ${msg}`, texture: options });\n        }\n\n        this.loaded = true;\n        this.loading = Promise.resolve(this);\n        return this.loading;\n    }\n\n    // Uploads current image or buffer to the GPU (can be used to update animated textures on the fly)\n    update(source, options = {}) {\n        if (!this.valid) {\n            return;\n        }\n\n        this.bind();\n        this.gl.pixelStorei(this.gl.UNPACK_FLIP_Y_WEBGL, (options.UNPACK_FLIP_Y_WEBGL === false ? false : true));\n        this.gl.pixelStorei(this.gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, options.UNPACK_PREMULTIPLY_ALPHA_WEBGL || false);\n\n        // Image or Canvas element\n        if (source instanceof HTMLCanvasElement || source instanceof HTMLVideoElement ||\n            (source instanceof HTMLImageElement && source.complete)) {\n\n            this.width = source.width;\n            this.height = source.height;\n            this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.gl.RGBA, this.gl.UNSIGNED_BYTE, source);\n        }\n        // Raw image buffer\n        else {\n            this.gl.texImage2D(this.gl.TEXTURE_2D, 0, this.gl.RGBA, this.width, this.height, 0, this.gl.RGBA, this.gl.UNSIGNED_BYTE, source);\n        }\n\n        Texture.trigger('update', this);\n    }\n\n    // Determines appropriate filtering mode\n    setFiltering(options = {}) {\n        if (!this.valid) {\n            return;\n        }\n\n        options.filtering = options.filtering || 'linear';\n\n        var gl = this.gl;\n        this.bind();\n\n        // For power-of-2 textures, the following presets are available:\n        // mipmap: linear blend from nearest mip\n        // linear: linear blend from original image (no mips)\n        // nearest: nearest pixel from original image (no mips, 'blocky' look)\n        if (Utils.isPowerOf2(this.width) && Utils.isPowerOf2(this.height)) {\n            this.power_of_2 = true;\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, options.TEXTURE_WRAP_S || (options.repeat && gl.REPEAT) || gl.CLAMP_TO_EDGE);\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, options.TEXTURE_WRAP_T || (options.repeat && gl.REPEAT) || gl.CLAMP_TO_EDGE);\n\n            if (options.filtering === 'mipmap') {\n                this.filtering = 'mipmap';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR); // TODO: use trilinear filtering by defualt instead?\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n                gl.generateMipmap(gl.TEXTURE_2D);\n            }\n            else if (options.filtering === 'linear') {\n                this.filtering = 'linear';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n            }\n            else if (options.filtering === 'nearest') {\n                this.filtering = 'nearest';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n            }\n        }\n        else {\n            // WebGL has strict requirements on non-power-of-2 textures:\n            // No mipmaps and must clamp to edge\n            this.power_of_2 = false;\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n\n            if (options.filtering === 'nearest') {\n                this.filtering = 'nearest';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n            }\n            else { // default to linear for non-power-of-2 textures\n                this.filtering = 'linear';\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);\n                gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n            }\n        }\n\n        Texture.trigger('update', this);\n    }\n\n    // Pre-calc sprite regions for a texture sprite in UV [0, 1] space\n    calculateSprites() {\n        if (this.sprites) {\n            for (let s in this.sprites) {\n                let sprite = this.sprites[s];\n\n                // Map [0, 0] to [1, 1] coords to the appropriate sprite sub-area of the texture\n                this.texcoords[s] = Texture.getTexcoordsForSprite(\n                    [sprite[0], sprite[1]],\n                    [sprite[2], sprite[3]],\n                    [this.width, this.height]\n                );\n\n                // Pixel size of sprite\n                this.sizes[s] = [sprite[2], sprite[3]];\n            }\n        }\n    }\n\n}\n\n\n// Static/class methods and state\n\nTexture.create = function (gl, name, options) {\n    return new Texture(gl, name, options);\n};\n\nTexture.retain = function (name) {\n    if (Texture.textures[name]) {\n        Texture.textures[name].retain();\n    }\n};\n\nTexture.release = function (name) {\n    if (Texture.textures[name]) {\n        Texture.textures[name].release();\n    }\n};\n\n// Destroy all texture instances for a given GL context\nTexture.destroy = function (gl) {\n    var textures = Object.keys(Texture.textures);\n    textures.forEach(t => {\n        var texture = Texture.textures[t];\n        if (texture.gl === gl) {\n            texture.destroy({ force: true });\n        }\n    });\n};\n\n// Get sprite pixel size and UVs\nTexture.getSpriteInfo = function (texname, sprite) {\n    let texture = Texture.textures[texname];\n    return texture && { size: texture.sizes[sprite], texcoords: texture.texcoords[sprite] };\n};\n\n// Re-scale UVs from [0, 1] range to a smaller area within the image\nTexture.getTexcoordsForSprite = function (area_origin, area_size, tex_size) {\n    var area_origin_y = tex_size[1] - area_origin[1] - area_size[1];\n\n    return [\n        area_origin[0] / tex_size[0],\n        area_origin_y / tex_size[1],\n        (area_size[0] + area_origin[0]) / tex_size[0],\n        (area_size[1] + area_origin_y) / tex_size[1]\n    ];\n};\n\n// Create a set of textures keyed in an object\n// Optionally load each if it has a URL specified\nTexture.createFromObject = function (gl, textures) {\n    let loading = [];\n    if (textures) {\n        for (let texname in textures) {\n            let config = textures[texname];\n\n            // If texture already exists and definition hasn't changed, no need to re-create\n            // Note: to avoid flicker when other textures/scene items change\n            if (!Texture.changed(texname, config)) {\n                continue;\n            }\n\n            let texture = Texture.create(gl, texname, config);\n            loading.push(texture.loading);\n        }\n    }\n    return Promise.all(loading);\n};\n\n// Create a 'default' texture (1x1 pixel) that can be used as a placeholder\n// (for example to prevent GL from complaining about unbound textures)\nTexture.default = '__default';\nTexture.createDefault = function (gl) {\n    return Texture.create(gl, Texture.default);\n};\n\n// Indicate if a texture definition would be a change from the current cache\nTexture.changed = function (name, config) {\n    let texture = Texture.textures[name];\n    if (texture) { // cached texture\n        // canvas/image-based textures are considered dynamic and always refresh\n        if (texture.config_type === 'element' || config.element != null) {\n            return true;\n        }\n\n        // compare definitions\n        if (Texture.texture_configs[name] === JSON.stringify(Object.assign({ name }, config))) {\n            return false;\n        }\n    }\n    return true;\n};\n\n// Get metadata for a texture by name\n// Returns via promise, in case texture is still loading\n// Can be called on main thread from worker, to sync texture info to worker\nTexture.getInfo = function (name) {\n    // Get info for all textures by default\n    if (!name) {\n        name = Object.keys(Texture.textures);\n    }\n\n    // Get multiple textures\n    if (Array.isArray(name)) {\n        return Promise.all(name.map(n => Texture.getInfo(n)));\n    }\n\n    // Get single texture\n    var tex = Texture.textures[name];\n    if (tex) {\n        // Wait for this texture to finish loading, or return immediately\n        var loading = tex.loading || Promise.resolve(tex);\n        return loading.then(() => {\n            // Return a subset of texture info\n            // (compatible w/structured cloning, suitable for passing to a worker)\n            return {\n                name: tex.name,\n                width: tex.width,\n                height: tex.height,\n                sprites: tex.sprites,\n                texcoords: tex.texcoords,\n                sizes: tex.sizes,\n                filtering: tex.filtering,\n                power_of_2: tex.power_of_2,\n                valid: tex.valid\n            };\n        });\n    }\n    else {\n        // No texture found\n        return Promise.resolve(null);\n    }\n};\n\n// Sync texture info to worker\n// Called from worker, gets info on one or more textures info from main thread via remote call, then stores it\n// locally in worker. 'textures' can be an array of texture names to sync, or if null, all textures are synced.\nTexture.syncTexturesToWorker = function (names) {\n    return WorkerBroker.postMessage('Texture.getInfo', names).\n        then(textures => {\n            textures.forEach(tex => {\n                Texture.textures[tex.name] = tex;\n            });\n            return Texture.textures;\n        });\n};\n\n// Report max texture size for a GL context\nTexture.getMaxTextureSize = function (gl) {\n    return gl.getParameter(gl.MAX_TEXTURE_SIZE);\n};\n\n// Global set of textures, by name\nTexture.textures = {};\nTexture.texture_configs = {};\nTexture.boundTexture = null;\nTexture.activeUnit = null;\n\nWorkerBroker.addTarget('Texture', Texture);\nsubscribeMixin(Texture);\n",
     "// Creates a Vertex Array Object if the extension is available, or falls back on standard attribute calls\n\nimport getExtension from './extensions';\nimport log from '../utils/log';\n\nexport default {\n\n    disabled: false, // set to true to disable VAOs even if extension is available\n    bound_vao: [],   // currently bound VAO, by GL context\n\n    init (gl) {\n        let ext;\n        if (this.disabled !== true) {\n            ext = getExtension(gl, 'OES_vertex_array_object');\n        }\n\n        if (ext != null) {\n            log('info', 'Vertex Array Object extension available');\n        }\n        else if (this.disabled !== true) {\n            log('warn', 'Vertex Array Object extension NOT available');\n        }\n        else {\n            log('warn', 'Vertex Array Object extension force disabled');\n        }\n    },\n\n    create (gl, setup, teardown) {\n        let vao = {};\n        vao.setup = setup;\n        vao.teardown = teardown;\n\n        let ext = getExtension(gl, 'OES_vertex_array_object');\n        if (ext != null) {\n            vao._vao = ext.createVertexArrayOES();\n            ext.bindVertexArrayOES(vao._vao);\n        }\n\n        vao.setup(true);\n\n        return vao;\n    },\n\n    getCurrentBinding (gl) {\n        let bound = this.bound_vao.filter(e => e[0] === gl)[0];\n        return bound && bound[1];\n    },\n\n    setCurrentBinding (gl, vao) {\n        let bound_vao = this.bound_vao;\n        let binding = bound_vao.filter(e => e[0] === gl)[0];\n        if (binding == null) {\n            bound_vao.push([gl, vao]);\n        }\n        else {\n            binding[1] = vao;\n        }\n    },\n\n    bind (gl, vao) {\n        let ext = getExtension(gl, 'OES_vertex_array_object');\n        if (vao != null) {\n            if (ext != null && vao._vao != null) {\n                ext.bindVertexArrayOES(vao._vao);\n                this.setCurrentBinding(gl, vao);\n            }\n            else {\n                vao.setup(false);\n            }\n        }\n        else {\n            let bound_vao = this.getCurrentBinding(gl);\n            if (ext != null) {\n                ext.bindVertexArrayOES(null);\n            }\n            else if (bound_vao != null && typeof bound_vao.teardown === 'function') {\n                bound_vao.teardown();\n            }\n            this.setCurrentBinding(gl, null);\n        }\n    },\n\n    destroy (gl, vao) {\n        let ext = getExtension(gl, 'OES_vertex_array_object');\n        if (ext != null && vao != null && vao._vao != null) {\n            ext.deleteVertexArrayOES(vao._vao);\n            vao._vao = null;\n        }\n        // destroy is a no-op if VAO extension isn't available\n    }\n\n};\n",
     "// Manage rendering for primitives\nimport ShaderProgram from './shader_program';\nimport VertexArrayObject from './vao';\n\n// A single mesh/VBO, described by a vertex layout, that can be drawn with one or more programs\nexport default class VBOMesh  {\n\n    constructor(gl, vertex_data, element_data, vertex_layout, options) {\n        options = options || {};\n\n        this.gl = gl;\n        this.vertex_data = vertex_data; // typed array\n        this.element_data = element_data; // typed array\n        this.vertex_layout = vertex_layout;\n        this.vertex_buffer = this.gl.createBuffer();\n        this.buffer_size = this.vertex_data.byteLength;\n        this.draw_mode = options.draw_mode || this.gl.TRIANGLES;\n        this.data_usage = options.data_usage || this.gl.STATIC_DRAW;\n        this.vertices_per_geometry = 3; // TODO: support lines, strip, fan, etc.\n        this.uniforms = options.uniforms;\n        this.retain = options.retain || false; // whether to retain mesh data in CPU after uploading to GPU\n        this.created_at = +new Date();\n        this.fade_in_time = options.fade_in_time || 0; // optional time to fade in mesh\n\n        this.vertex_count = this.vertex_data.byteLength / this.vertex_layout.stride;\n        this.element_count = 0;\n        this.vaos = {}; // map of VertexArrayObjects, keyed by program\n\n        this.toggle_element_array = false;\n        if (this.element_data) {\n            this.toggle_element_array = true;\n            this.element_count = this.element_data.length;\n            this.geometry_count = this.element_count / this.vertices_per_geometry;\n            this.element_type = (this.element_data.constructor === Uint16Array) ? this.gl.UNSIGNED_SHORT: this.gl.UNSIGNED_INT;\n            this.element_buffer = this.gl.createBuffer();\n            this.buffer_size += this.element_data.byteLength;\n            this.gl.bindBuffer(this.gl.ELEMENT_ARRAY_BUFFER, this.element_buffer);\n            this.gl.bufferData(this.gl.ELEMENT_ARRAY_BUFFER, this.element_data, this.data_usage);\n        }\n        else {\n            this.geometry_count = this.vertex_count / this.vertices_per_geometry;\n        }\n\n        this.gl.bindBuffer(this.gl.ARRAY_BUFFER, this.vertex_buffer);\n        this.gl.bufferData(this.gl.ARRAY_BUFFER, this.vertex_data, this.data_usage);\n\n        if (!this.retain) {\n            delete this.vertex_data;\n            delete this.element_data;\n        }\n        this.valid = true;\n    }\n\n    // Render, by default with currently bound program, or otherwise with optionally provided one\n    // Returns true if mesh requests a render on next frame (e.g. for fade animations)\n    render(options = {}) {\n        if (!this.valid) {\n            return false;\n        }\n\n        var program = options.program || ShaderProgram.current;\n        program.use();\n\n        if (this.uniforms) {\n            program.saveUniforms(this.uniforms);\n            program.setUniforms(this.uniforms, false); // don't reset texture unit\n        }\n\n        let visible_time = (+new Date() - this.created_at) / 1000;\n        program.uniform('1f', 'u_visible_time', visible_time);\n\n        this.bind(program);\n\n        if (this.toggle_element_array){\n            this.gl.drawElements(this.draw_mode, this.element_count, this.element_type, 0);\n        }\n        else {\n            this.gl.drawArrays(this.draw_mode, 0, this.vertex_count);\n        }\n\n        VertexArrayObject.bind(this.gl, null);\n\n        if (this.uniforms) {\n            program.restoreUniforms(this.uniforms);\n        }\n\n        // Request next render if mesh is fading in\n        return (visible_time < this.fade_in_time);\n    }\n\n    // Bind buffers and vertex attributes to prepare for rendering\n    bind(program) {\n        // Bind VAO for this progam, or create one\n        let vao = this.vaos[program.id];\n        if (vao) {\n            VertexArrayObject.bind(this.gl, vao);\n        }\n        else {\n            this.vaos[program.id] = VertexArrayObject.create(this.gl, (force) => {\n                this.gl.bindBuffer(this.gl.ARRAY_BUFFER, this.vertex_buffer);\n                if (this.toggle_element_array) {\n                    this.gl.bindBuffer(this.gl.ELEMENT_ARRAY_BUFFER, this.element_buffer);\n                }\n                this.vertex_layout.enable(this.gl, program, force);\n            });\n        }\n    }\n\n    destroy() {\n        if (!this.valid) {\n            return false;\n        }\n        this.valid = false;\n\n        for (let v in this.vaos) {\n            VertexArrayObject.destroy(this.gl, this.vaos[v]);\n        }\n\n\n        this.gl.deleteBuffer(this.vertex_buffer);\n        this.vertex_buffer = null;\n\n        if (this.element_buffer) {\n            this.gl.deleteBuffer(this.element_buffer);\n            this.element_buffer = null;\n        }\n\n        delete this.vertex_data;\n        delete this.element_data;\n\n        return true;\n    }\n\n}\n",
     "import gl from './constants'; // web workers don't have access to GL context, so import all GL constants\nimport log from '../utils/log';\nimport VertexElements from './vertex_elements';\n\n// Maps GL types to JS array types\nlet array_types = {\n    [gl.FLOAT]: Float32Array,\n    [gl.BYTE]: Int8Array,\n    [gl.UNSIGNED_BYTE]: Uint8Array,\n    [gl.INT]: Int32Array,\n    [gl.UNSIGNED_INT]: Uint32Array,\n    [gl.SHORT]: Int16Array,\n    [gl.UNSIGNED_SHORT]: Uint16Array\n};\n\n// An intermediary object that holds vertex data in typed arrays, according to a given vertex layout\n// Used to construct a mesh/VBO for rendering\nexport default class VertexData {\n\n    constructor (vertex_layout, { prealloc = 500 } = {}) {\n        this.vertex_layout = vertex_layout;\n        this.vertex_elements = new VertexElements();\n\n        if (VertexData.array_pool.length > 0) {\n            this.vertex_buffer = VertexData.array_pool.pop();\n            this.byte_length = this.vertex_buffer.byteLength;\n            this.size = Math.floor(this.byte_length / this.vertex_layout.stride);\n            log('trace', `VertexData: reused buffer of bytes ${this.byte_length}, ${this.size} vertices`);\n        }\n        else {\n            this.size = prealloc; // # of vertices to allocate\n            this.byte_length = this.vertex_layout.stride * this.size;\n            this.vertex_buffer = new Uint8Array(this.byte_length);\n        }\n        this.offset = 0;             // byte offset into currently allocated buffer\n\n        this.components = [];\n        for (let c=0; c < this.vertex_layout.components.length; c++) {\n            this.components.push([...this.vertex_layout.components[c]]);\n        }\n        this.vertex_count = 0;\n        this.realloc_count = 0;\n        this.setBufferViews();\n    }\n\n    // (Re-)allocate typed views into the main buffer - only create the types we need for this layout\n    setBufferViews () {\n        this.views = {};\n        this.views[gl.UNSIGNED_BYTE] = this.vertex_buffer;\n        for (let a=0; a < this.vertex_layout.attribs.length; a++) {\n            const attrib = this.vertex_layout.attribs[a];\n\n            // Need view for this type?\n            if (this.views[attrib.type] == null) {\n                var array_type = array_types[attrib.type];\n                this.views[attrib.type] = new array_type(this.vertex_buffer.buffer);\n            }\n        }\n\n        // Update component buffer pointers\n        for (let c=0; c < this.components.length; c++) {\n            const component = this.components[c];\n            component[1] = this.views[component[0]];\n        }\n    }\n\n    // Check allocated buffer size, expand/realloc buffer if needed\n    checkBufferSize () {\n        if ((this.offset + this.vertex_layout.stride) > this.byte_length) {\n            this.size = Math.floor(this.size * 1.5);\n            this.size -= this.size % 4;\n            this.byte_length = this.vertex_layout.stride * this.size;\n            var new_view = new Uint8Array(this.byte_length);\n            new_view.set(this.vertex_buffer); // copy existing data to new buffer\n            VertexData.array_pool.push(this.vertex_buffer); // save previous buffer for use by next tile\n            this.vertex_buffer = new_view;\n            this.setBufferViews();\n            this.realloc_count++;\n            // log('info', `VertexData: expanded vertex block to ${this.size} vertices`);\n        }\n    }\n\n    // Add a vertex, copied from a plain JS array of elements matching the order of the vertex layout.\n    // Note: uses pre-calculated info about each attribute, including pointer to appropriate typed array\n    // view and offset into it. This was the fastest method profiled so far for filling a mixed-type\n    // vertex layout (though still slower than the previous method that only supported Float32Array attributes).\n    addVertex (vertex) {\n        this.checkBufferSize();\n        var i=0;\n\n        var clen = this.components.length;\n        for (var c=0; c < clen; c++) {\n            var component = this.components[c];\n            component[1][(this.offset >> component[2]) + component[3]] = vertex[i++];\n        }\n\n        this.offset += this.vertex_layout.stride;\n        this.vertex_count++;\n    }\n\n    // Finalize vertex buffer for use in constructing a mesh\n    end () {\n        // Clip the buffer to size used for this VBO\n        this.vertex_buffer = this.vertex_buffer.subarray(0, this.offset);\n        this.element_buffer = this.vertex_elements.end();\n\n        log('trace', `VertexData: ${this.size} vertices total, realloc count ${this.realloc_count}`);\n\n        return this;\n    }\n\n}\n\nVertexData.array_pool = []; // pool of currently available (previously used) buffers (uint8)\n",
@@ -499,11 +499,11 @@
     "// Sets of values to match for directional and corner anchors\nconst lefts = ['left', 'top-left', 'bottom-left'];\nconst rights = ['right', 'top-right', 'bottom-right'];\nconst tops = ['top', 'top-left', 'top-right'];\nconst bottoms = ['bottom', 'bottom-left', 'bottom-right'];\n\nlet PointAnchor;\n\nexport default PointAnchor = {\n\n    computeOffset (offset, size, anchor, buffer = null) {\n        if (!anchor || anchor === 'center') {\n            return offset;\n        }\n\n        let offset2 = [offset[0], offset[1]];\n        buffer = buffer || this.default_buffer;\n\n        // An optional left/right offset\n        if (this.isLeftAnchor(anchor)) {\n            offset2[0] -= size[0] / 2;\n            if (anchor === 'left') {\n                offset2[0] -= buffer[0];\n            }\n        }\n        else if (this.isRightAnchor(anchor)) {\n            offset2[0] += size[0] / 2;\n            if (anchor === 'right') {\n                offset2[0] += buffer[1];\n            }\n        }\n\n        // An optional top/bottom offset\n        if (this.isTopAnchor(anchor)) {\n            offset2[1] -= size[1] / 2;\n            if (anchor === 'top') {\n                offset2[1] -= buffer[2];\n            }\n        }\n        else if (this.isBottomAnchor(anchor)) {\n            offset2[1] += size[1] / 2;\n            if (anchor === 'bottom') {\n                offset2[1] += buffer[3];\n            }\n        }\n\n        return offset2;\n    },\n\n    alignForAnchor (anchor) {\n        if (anchor && anchor !== 'center') {\n            if (this.isLeftAnchor(anchor)) {\n                return 'right';\n            }\n            else if (this.isRightAnchor(anchor)) {\n                return 'left';\n            }\n        }\n        return 'center';\n    },\n\n    isLeftAnchor (anchor) {\n        return (lefts.indexOf(anchor) > -1);\n    },\n\n    isRightAnchor (anchor) {\n        return (rights.indexOf(anchor) > -1);\n    },\n\n    isTopAnchor (anchor) {\n        return (tops.indexOf(anchor) > -1);\n    },\n\n    isBottomAnchor (anchor) {\n        return (bottoms.indexOf(anchor) > -1);\n    },\n\n    // Buffers: [left, right, top, bottom]\n    default_buffer: [2.5, 2.5, 1.5, 0.75],\n    zero_buffer: [0, 0, 0, 0]\n\n};\n",
     "// Logic for placing point labels along a line geometry\n\nimport LabelPoint from './label_point';\nimport {isCoordOutsideTile} from '../builders/common';\n\nconst PLACEMENT = LabelPoint.PLACEMENT;\nconst default_spacing = 80; // spacing of points along line in pixels\n\nexport default function placePointsOnLine (line, size, options) {\n    let labels = [];\n    let strategy = options.placement;\n    let min_length = Math.max(size[0], size[1]) * options.placement_min_length_ratio * options.units_per_pixel;\n\n    switch (strategy){\n        case PLACEMENT.SPACED:\n            let result = getPositionsAndAngles(line, min_length, options);\n            // false will be returned if line have no length\n            if (!result) {\n                return [];\n            }\n\n            let positions = result.positions;\n            let angles = result.angles;\n            for (let i = 0; i < positions.length; i++){\n                let position = positions[i];\n                let angle = angles[i];\n                if (options.tile_edges === true || !isCoordOutsideTile(position)) {\n                    let label = new LabelPoint(position, size, options);\n                    label.angle = angle;\n                    labels.push(label);\n                }\n            }\n            break;\n        case PLACEMENT.VERTEX:\n            let p, q, label;\n            for (let i = 0; i < line.length - 1; i++){\n                p = line[i];\n                q = line[i + 1];\n                if (options.tile_edges === true || !isCoordOutsideTile(p)) {\n                    label = new LabelPoint(p, size, options);\n                    label.angle = getAngle(p, q, options.angle);\n                    labels.push(label);\n                }\n            }\n\n            // add last endpoint\n            label = new LabelPoint(q, size, options);\n            label.angle = getAngle(p, q, options.angle);\n            labels.push(label);\n            break;\n        case PLACEMENT.MIDPOINT:\n            for (let i = 0; i < line.length - 1; i++){\n                let p = line[i];\n                let q = line[i + 1];\n                let position = [\n                    0.5 * (p[0] + q[0]),\n                    0.5 * (p[1] + q[1])\n                ];\n                if (options.tile_edges === true || !isCoordOutsideTile(position)) {\n                    if (!min_length || norm(p, q) > min_length) {\n                        let label = new LabelPoint(position, size, options);\n                        label.angle = getAngle(p, q, options.angle);\n                        labels.push(label);\n                    }\n                }\n            }\n            break;\n    }\n    return labels;\n}\n\nfunction getPositionsAndAngles(line, min_length, options){\n    let upp = options.units_per_pixel;\n    let spacing = (options.placement_spacing || default_spacing) * upp;\n\n    let length = getLineLength(line);\n    if (length <= min_length) {\n        return false;\n    }\n\n    let num_labels = Math.max(Math.floor(length / spacing), 1);\n    let remainder = length - (num_labels - 1) * spacing;\n    let positions = [];\n    let angles = [];\n\n    let distance = 0.5 * remainder;\n    for (let i = 0; i < num_labels; i++){\n        let {position, angle} = interpolateLine(line, distance, min_length, options);\n        if (position != null && angle != null) {\n            positions.push(position);\n            angles.push(angle);\n        }\n        distance += spacing;\n    }\n\n    return {positions, angles};\n}\n\nfunction getAngle(p, q, angle = 0){\n    return (angle === 'auto') ? Math.atan2(q[0] - p[0], q[1] - p[1]) : angle;\n}\n\nfunction getLineLength(line){\n    let distance = 0;\n    for (let i = 0; i < line.length - 1; i++){\n        distance += norm(line[i], line[i+1]);\n    }\n    return distance;\n}\n\nfunction norm(p, q){\n    return Math.sqrt(Math.pow(p[0] - q[0], 2) + Math.pow(p[1] - q[1], 2));\n}\n\nfunction interpolateLine(line, distance, min_length, options){\n    let sum = 0;\n    let position, angle;\n    for (let i = 0; i < line.length-1; i++){\n        let p = line[i];\n        let q = line[i+1];\n\n        const length = norm(p, q);\n        if (length <= min_length) {\n            continue;\n        }\n\n        sum += length;\n\n        if (sum > distance){\n            position = interpolateSegment(p, q, sum - distance);\n            angle = getAngle(p, q, options.angle);\n            break;\n        }\n    }\n    return {position, angle};\n}\n\nfunction interpolateSegment(p, q, distance){\n    let length = norm(p, q);\n    let ratio = distance / length;\n    return [\n        ratio * p[0] + (1 - ratio) * q[0],\n        ratio * p[1] + (1 - ratio) * q[1]\n    ];\n}\n",
     "import Geo from '../geo';\n\nexport default class RepeatGroup {\n\n    constructor (key, repeat_dist, max_repeat_dist) {\n        this.key = key;\n        this.repeat_dist = repeat_dist;\n        this.repeat_dist_sq = this.repeat_dist * this.repeat_dist;\n        this.max_repeat_dist_sq = max_repeat_dist * max_repeat_dist;\n        this.one_per_group = (this.repeat_dist_sq >= this.max_repeat_dist_sq) ? true : false;\n        this.positions = [];\n    }\n\n    // Check an object to see if it's a repeat in this group\n    check (obj) {\n        // If only one object allowed per group, shortcut distance logic\n        if (this.one_per_group) {\n            if (this.positions.length > 0) {\n                // reported distance maxes out at threshold in this case\n                // (not true dist value since we skipped calculating it)\n                return {\n                    dist_sq: this.max_repeat_dist_sq,\n                    repeat_dist_sq: this.repeat_dist_sq,\n                    one_per_group: this.one_per_group\n                };\n            }\n            return; // no object for this group yet\n        }\n\n        // Check distance from new object to objects already in group\n        let p1 = obj.position;\n        for (let i=0; i < this.positions.length; i++) {\n            let p2 = this.positions[i];\n            let dx = p1[0] - p2[0];\n            let dy = p1[1] - p2[1];\n            let dist_sq = dx * dx + dy * dy;\n\n            // Found an existing object within allowed distance\n            if (dist_sq < this.repeat_dist_sq) {\n                return {\n                    dist_sq,\n                    repeat_dist_sq: this.repeat_dist_sq\n                };\n            }\n        }\n    }\n\n    // Add object to this group\n    add (obj) {\n        // only store object's position, to save space / prevent unnecessary references\n        if (obj && obj.position) {\n            this.positions.push(obj.position);\n        }\n    }\n\n    // Static methods are used to manage repeat groups, within and across tiles\n\n    // Reset all groups for this tile\n    static clear (tile) {\n        this.groups[tile] = {};\n    }\n\n    // Check an object to see if it's a repeat within its designated group\n    static check (obj, layout, tile) {\n        if (layout.repeat_distance && layout.repeat_group && this.groups[tile][layout.repeat_group]) {\n            return this.groups[tile][layout.repeat_group].check(obj);\n        }\n    }\n\n    // Add an object to its designated group\n    static add (obj, layout, tile) {\n        if (layout.repeat_distance && layout.repeat_group) {\n            if (this.groups[tile][layout.repeat_group] == null) {\n                this.groups[tile][layout.repeat_group] = new RepeatGroup(\n                    layout.repeat_group,\n                    layout.repeat_distance,\n                    RepeatGroup.max_repeat_dist\n                );\n            }\n            this.groups[tile][layout.repeat_group].add(obj);\n        }\n    }\n\n}\n\n// Current set of repeat groups, grouped and keyed by tile\nRepeatGroup.groups = {};\n\n// Max repeat dist: for groups with a repeat dist beyond this threshold, only one label\n// will be allowed per group, e.g. set to tile size for one-label-per-tile\nRepeatGroup.max_repeat_dist = Geo.tile_scale;\n",
-    "import Thread from './utils/thread';\nimport Scene from './scene';\nimport Geo from './geo';\nimport debounce from './utils/debounce';\n\n// Exports must appear outside a function, but will only be defined in main thread (below)\nexport var LeafletLayer;\nexport function leafletLayer(options) {\n    return extendLeaflet(options);\n}\n\nfunction extendLeaflet(options) {\n\n    // If LeafletLayer is already defined when this is called just return that immediately\n    // e.g. if you call leafletLayer multiple times (which is valid)\n    if (typeof LeafletLayer !== 'undefined') {\n        return new LeafletLayer(options);\n    }\n\n    // Leaflet layer functionality is only defined in main thread\n    if (Thread.is_main) {\n\n        let L = options.leaflet || window.L;\n\n        // Determine if we are extending the leaflet 0.7.x TileLayer class, or the newer\n        // leaflet 1.x GridLayer class.\n        let layerBaseClass = L.GridLayer ? L.GridLayer : L.TileLayer;\n        let leafletVersion = layerBaseClass === L.GridLayer ? '1.x' : '0.7.x';\n        let layerClassConfig = {};\n        let setZoomAroundNoMoveEnd, debounceMoveEnd; // alternate zoom functions defined below\n\n        // If extending leaflet 0.7.x TileLayer, additional modifications are needed\n        if (layerBaseClass === L.TileLayer) {\n            layerClassConfig._addTile = function(){};\n            layerClassConfig._removeTile = function(){};\n            layerClassConfig._reset = function() {\n                layerBaseClass.prototype._reset.apply(this, arguments);\n                // re-add the canvas since base class `viewreset` event can remove it\n                if (this.scene && this.scene.container && this.scene.canvas) {\n                    this.scene.container.appendChild(this.scene.canvas);\n                }\n            };\n        }\n\n        // Define custom layer methods\n        Object.assign(layerClassConfig, {\n\n            initialize (options) {\n                // Defaults\n                options.showDebug = (!options.showDebug ? false : true);\n\n                L.setOptions(this, options);\n                this.createScene();\n                this.hooks = {};\n                this._updating_tangram = false;\n                this._zoomAnimated = false; // turn leaflet zoom animations off for this layer\n            },\n\n            createScene () {\n                this.scene = Scene.create(\n                    this.options.scene,\n                    {\n                        numWorkers: this.options.numWorkers,\n                        preUpdate: this.options.preUpdate,\n                        postUpdate: this.options.postUpdate,\n                        continuousZoom: (LeafletLayer.leafletVersion === '1.x'),\n                        highDensityDisplay: this.options.highDensityDisplay,\n                        logLevel: this.options.logLevel,\n                        introspection: this.options.introspection,\n                        // advanced option, app will have to manually called scene.update() per frame\n                        disableRenderLoop: this.options.disableRenderLoop\n                    });\n            },\n\n            // Finish initializing scene and setup events when layer is added to map\n            onAdd (map) {\n                if (!this.scene) {\n                    this.createScene();\n                }\n\n                layerBaseClass.prototype.onAdd.apply(this, arguments);\n\n                this.hooks.resize = () => {\n                    this._updating_tangram = true;\n                    this.updateSize();\n                    this._updating_tangram = false;\n                };\n                map.on('resize', this.hooks.resize);\n\n                this.hooks.move = () => {\n                    if (this._updating_tangram) {\n                        return;\n                    }\n                    this._updating_tangram = true;\n\n                    this.scene.view.setPanning(true);\n                    var view = map.getCenter();\n                    view.zoom = Math.min(map.getZoom(), map.getMaxZoom() || Geo.default_view_max_zoom);\n\n                    this.scene.view.setView(view);\n                    if (this._mapLayerCount > 1) {\n                        // if there are other map pane layers active, redraw immediately to stay in better visual sync\n                        // otherwise, wait until next regular animation loop iteration\n                        this.scene.immediateRedraw();\n                    }\n                    this.reverseTransform();\n\n                    this._updating_tangram = false;\n                };\n                map.on('move', this.hooks.move);\n\n                this.hooks.zoomstart = () => {\n                    if (this._updating_tangram) {\n                        return;\n                    }\n\n                    this._updating_tangram = true;\n                    this.scene.view.startZoom();\n                    this._updating_tangram = false;\n                };\n                map.on('zoomstart', this.hooks.zoomstart);\n\n                this.hooks.moveend = () => {\n                    this.scene.view.setPanning(false);\n                    this.scene.requestRedraw();\n                };\n                map.on('moveend', this.hooks.moveend);\n\n                // Modify default Leaflet behaviors\n                this.modifyScrollWheelBehavior(map);\n                this.modifyDoubleClickZoom(map);\n                debounceMoveEnd = debounce(\n                    function(map) {\n                        map._moveEnd(true);\n                        map.fire('viewreset'); // keep other leaflet layers in sync\n                    },\n                    map.options.wheelDebounceTime * 2\n                );\n                this.trackMapLayerCounts(map);\n\n                // Setup feature selection\n                this.setupSelectionEventHandlers(map);\n                this.setSelectionEvents(this.options.events);\n\n                // Add GL canvas to layer container\n                this.scene.container = this.getContainer();\n                this.updateSize();\n\n                // Initial view\n                this.updateView();\n                this.resizeOnFirstVisible();\n\n                // Subscribe to tangram events\n                this.scene.subscribe({\n                    move: this.onTangramViewUpdate.bind(this)\n                });\n\n                // Use leaflet's existing event system as the callback mechanism\n                this.scene.load(this.options.scene,\n                    { config_path: this.options.sceneBasePath, blocking: false }).then(() => {\n\n                    this._updating_tangram = true;\n\n                    this.updateSize();\n                    this.updateView();\n                    this.reverseTransform();\n\n                    this._updating_tangram = false;\n\n                    this.fire('init');\n                }).catch(error => {\n                    this.fire('error', error);\n                });\n            },\n\n            onRemove (map) {\n                layerBaseClass.prototype.onRemove.apply(this, arguments);\n\n                map.off('layeradd layerremove overlayadd overlayremove', this._updateMapLayerCount);\n                map.off('resize', this.hooks.resize);\n                map.off('move', this.hooks.move);\n                map.off('zoomstart', this.hooks.zoomstart);\n                map.off('moveend', this.hooks.moveend);\n                map.off('click', this.hooks.click);\n                map.off('mousemove', this.hooks.mousemove);\n                map.off('mouseout', this.hooks.mouseout);\n                document.removeEventListener('visibilitychange', this.hooks.visibilitychange);\n                this.hooks = {};\n\n                if (this.scene) {\n                    this.scene.destroy();\n                    this.scene = null;\n                }\n            },\n\n            createTile (coords) {\n                var key = coords.x + '/' + coords.y + '/' + coords.z;\n                var div = document.createElement('div');\n                div.setAttribute('data-tile-key', key);\n                div.style.width = '256px';\n                div.style.height = '256px';\n\n                if (this.options.showDebug) {\n                    var debug_overlay = document.createElement('div');\n                    debug_overlay.textContent = key;\n                    debug_overlay.style.position = 'absolute';\n                    debug_overlay.style.left = 0;\n                    debug_overlay.style.top = 0;\n                    debug_overlay.style.color = 'white';\n                    debug_overlay.style.fontSize = '16px';\n                    debug_overlay.style.textOutline = '1px #000000';\n                    debug_overlay.style.padding = '8px';\n\n                    div.appendChild(debug_overlay);\n                    div.style.borderStyle = 'solid';\n                    div.style.borderColor = 'white';\n                    div.style.borderWidth = '1px';\n                }\n\n                return div;\n            },\n\n            // Modify leaflet's default scroll wheel behavior to render frames more frequently\n            // (should generally lead to smoother scroll with Tangram frame re-render)\n            modifyScrollWheelBehavior (map) {\n                if (this.scene.view.continuous_zoom && map.scrollWheelZoom && this.options.modifyScrollWheel !== false) {\n                    map.options.zoomSnap = 0;\n\n                    const enabled = map.scrollWheelZoom.enabled();\n                    map.scrollWheelZoom.disable();\n\n                    // Chrome and Safari have smoother scroll-zoom without actively throttling the mouse wheel,\n                    // while FF and Edge/IE do better with throttling.\n                    // TODO: may be related to syncing differences with requestAnimationFrame loop, investigate further\n                    if (L.Browser.chrome || L.Browser.safari) {\n                        map.scrollWheelZoom._onWheelScroll = function (e) {\n                            var delta = L.DomEvent.getWheelDelta(e);\n                            this._delta += delta;\n                            this._lastMousePos = this._map.mouseEventToContainerPoint(e);\n                            this._performZoom();\n                            L.DomEvent.stop(e);\n                        };\n                    }\n                    else {\n                        map.options.wheelDebounceTime = 20; // better default for FF and Edge/IE\n                    }\n\n                    map.scrollWheelZoom._performZoom = function () {\n                        var map = this._map,\n                            zoom = map.getZoom();\n\n                        map._stop(); // stop panning and fly animations if any\n\n                        var delta = this._delta / (this._map.options.wheelPxPerZoomLevel * 4);\n                        this._delta = 0;\n\n                        if ((zoom + delta) >= this._map.getMaxZoom()) {\n                            delta = this._map.getMaxZoom() - zoom; // don't go past max zoom\n                        }\n\n                        if (!delta) { return; }\n\n                        if (map.options.scrollWheelZoom === 'center') {\n                            setZoomAroundNoMoveEnd(map, map.getCenter(), zoom + delta);\n                        } else {\n                            setZoomAroundNoMoveEnd(map, this._lastMousePos, zoom + delta);\n                        }\n                        debounceMoveEnd(map);\n                    };\n\n                    if (enabled) {\n                        map.scrollWheelZoom.enable();\n                    }\n                }\n            },\n\n            // Modify leaflet's default double-click zoom behavior, to match typical vector basemap products\n            modifyDoubleClickZoom (map) {\n                if (this.scene.view.continuous_zoom && map.doubleClickZoom && this.options.modifyDoubleClickZoom !== false) {\n\n                    // Simplified version of Leaflet's flyTo, for short animations zooming around a point\n                    const flyAround = function (map, targetCenter, targetZoom, options) {\n                        options = options || {};\n                        if (options.animate === false || !L.Browser.any3d) {\n                            return map.setView(targetCenter, targetZoom, options);\n                        }\n\n                        map._stop();\n\n                        var startZoom = map._zoom;\n\n                        targetCenter = L.latLng(targetCenter);\n                        targetZoom = targetZoom === undefined ? startZoom : targetZoom;\n                        targetZoom = Math.min(targetZoom, map.getMaxZoom()); // don't go past max zoom\n\n                        var from = map.project(map.getCenter(), startZoom),\n                            to = map.project(targetCenter, startZoom);\n\n                        var start = Date.now(),\n                            duration = options.duration ? 1000 * options.duration : 75;\n\n                        function frame() {\n                            var t = (Date.now() - start) / duration;\n\n                            if (t <= 1) {\n                                // reuse internal flyTo frame to ensure these animations are canceled like others\n                                map._flyToFrame = L.Util.requestAnimFrame(frame, map);\n\n                                var center = from.add(to.subtract(from).multiplyBy(t));\n                                center = [center.x, center.y];\n                                center = Geo.metersToLatLng(center);\n                                setZoomAroundNoMoveEnd(map, targetCenter, startZoom + (targetZoom - startZoom) * t);\n                            } else {\n                                setZoomAroundNoMoveEnd(map, targetCenter, targetZoom)\n                                    ._moveEnd(true);\n                            }\n                        }\n\n                        map._moveStart(true);\n\n                        frame.call(map);\n                        return map;\n                    };\n\n                    // Modify the double-click zoom handler to do a short zoom animation\n                    const enabled = map.doubleClickZoom.enabled();\n                    map.doubleClickZoom.disable();\n\n                    map.doubleClickZoom._onDoubleClick = function (e) {\n                        var map = this._map,\n                            oldZoom = map.getZoom(),\n                            delta = map.options.zoomDelta,\n                            zoom = e.originalEvent.shiftKey ? oldZoom - delta : oldZoom + delta;\n\n                        if (map.options.doubleClickZoom === 'center') {\n                            flyAround(map, map.getCenter(), zoom);\n                        } else {\n                            flyAround(map, map.containerPointToLatLng(e.containerPoint), zoom);\n                        }\n                    };\n\n                    if (enabled) {\n                        map.doubleClickZoom.enable();\n                    }\n                }\n            },\n\n            updateView () {\n                var view = this._map.getCenter();\n                view.zoom = Math.min(this._map.getZoom(), this._map.getMaxZoom() || Geo.default_view_max_zoom);\n                this.scene.view.setView(view);\n            },\n\n            updateSize () {\n                var size = this._map.getSize();\n                this.scene.resizeMap(size.x, size.y);\n            },\n\n            resizeOnFirstVisible () {\n                let first_visibility = true;\n                this.hooks.visibilitychange = () => {\n                    if (first_visibility) {\n                        first_visibility = false;\n                        this.updateSize();\n                    }\n                };\n\n                document.addEventListener('visibilitychange', this.hooks.visibilitychange);\n            },\n\n            onTangramViewUpdate () {\n                if (!this._map || this._updating_tangram) {\n                    return;\n                }\n\n                // View changed?\n                let map_center = this._map.getCenter();\n                let view_center = this.scene.view.center;\n                if (map_center.lng === view_center.lng &&\n                    map_center.lat === view_center.lat &&\n                    this._map.getZoom() === this.scene.view.zoom) {\n                    return;\n                }\n\n                this._updating_tangram = true;\n                this._map.setView([this.scene.view.center.lat, this.scene.view.center.lng], this.scene.view.zoom, { animate: false });\n                this.reverseTransform();\n                this._updating_tangram = false;\n            },\n\n            render () {\n                if (!this.scene) {\n                    return;\n                }\n                this.scene.update();\n            },\n\n            // Reverse the CSS positioning Leaflet applies to the layer, since Tangram's WebGL canvas\n            // is expected to be 'absolutely' positioned.\n            reverseTransform () {\n                if (!this._map || !this.scene || !this.scene.container) {\n                    return;\n                }\n\n                var top_left = this._map.containerPointToLayerPoint([0, 0]);\n                L.DomUtil.setPosition(this.scene.container, top_left);\n            },\n\n            // Tie Leaflet event handlers to Tangram feature selection\n            setupSelectionEventHandlers (map) {\n                this._selection_events = {};\n\n                this.hooks.click = (event) => {\n                    if (typeof this._selection_events.click === 'function') {\n                        this.scene.getFeatureAt(event.containerPoint).\n                            then(selection => {\n                                let results = Object.assign({}, selection, { leaflet_event: event });\n                                this._selection_events.click(results);\n                            });\n                    }\n                };\n                map.on('click', this.hooks.click);\n\n                this.hooks.mousemove = (event) => {\n                    if (typeof this._selection_events.hover === 'function') {\n                        this.scene.getFeatureAt(event.containerPoint).\n                            then(selection => {\n                                let results = Object.assign({}, selection, { leaflet_event: event });\n                                this._selection_events.hover(results);\n                            });\n                    }\n                };\n                map.on('mousemove', this.hooks.mousemove);\n\n                this.hooks.mouseout = (event) => {\n                    // When mouse leaves map, send an additional selection event to indicate no feature is selected\n                    if (typeof this._selection_events.hover === 'function') {\n                        this._selection_events.hover({ changed: true, leaflet_event: event });\n                    }\n                };\n                map.on('mouseout', this.hooks.mouseout);\n            },\n\n            // Set user-defined handlers for feature selection events\n            // Currently only one handler can be defined for each event type\n            // Event types are: `click`, `hover` (leaflet `mousemove`)\n            setSelectionEvents (events) {\n                this._selection_events = Object.assign(this._selection_events, events);\n            },\n\n            // Track the # of layers in the map pane\n            // Used to optimize Tangram redraw sensitivity (redraw more frequently when needing to sync w/other layers)\n            trackMapLayerCounts (map) {\n                this._updateMapLayerCount = () => {\n                    let nodes = map.getPanes().mapPane.childNodes;\n                    this._mapLayerCount = 0;\n                    for (let i=0; i < nodes.length; i++) {\n                        this._mapLayerCount += nodes[i].childNodes.length;\n                    }\n                };\n\n                map.on('layeradd layerremove overlayadd overlayremove', this._updateMapLayerCount);\n                this._updateMapLayerCount();\n            }\n\n        });\n\n        // Modified version of Leaflet's setZoomAround that doesn't trigger a moveEnd event\n        setZoomAroundNoMoveEnd = function (map, latlng, zoom) {\n            var scale = map.getZoomScale(zoom),\n                viewHalf = map.getSize().divideBy(2),\n                containerPoint = latlng instanceof L.Point ? latlng : map.latLngToContainerPoint(latlng),\n\n                centerOffset = containerPoint.subtract(viewHalf).multiplyBy(1 - 1 / scale),\n                newCenter = map.containerPointToLatLng(viewHalf.add(centerOffset));\n\n            return map._move(newCenter, zoom, { flyTo: true });\n        };\n\n        // Create the layer class\n        LeafletLayer = layerBaseClass.extend(layerClassConfig);\n\n        // Polyfill some 1.0 methods\n        if (typeof LeafletLayer.remove !== 'function') {\n            LeafletLayer.prototype.remove = function() {\n                if (this._map) {\n                    this._map.removeLayer(this);\n                }\n                this.fire('remove');\n            };\n        }\n\n        LeafletLayer.layerBaseClass = layerBaseClass;\n        LeafletLayer.leafletVersion = leafletVersion;\n\n        return new LeafletLayer(options);\n    }\n}\n",
+    "import Thread from './utils/thread';\nimport Scene from './scene';\nimport Geo from './geo';\nimport debounce from './utils/debounce';\n\n// Exports must appear outside a function, but will only be defined in main thread (below)\nexport var LeafletLayer;\nexport function leafletLayer(options) {\n    return extendLeaflet(options);\n}\n\nfunction extendLeaflet(options) {\n\n    // If LeafletLayer is already defined when this is called just return that immediately\n    // e.g. if you call leafletLayer multiple times (which is valid)\n    if (typeof LeafletLayer !== 'undefined') {\n        return new LeafletLayer(options);\n    }\n\n    // Leaflet layer functionality is only defined in main thread\n    if (Thread.is_main) {\n\n        let L = options.leaflet || window.L;\n\n        // Determine if we are extending the leaflet 0.7.x TileLayer class, or the newer\n        // leaflet 1.x GridLayer class.\n        let layerBaseClass = L.GridLayer ? L.GridLayer : L.TileLayer;\n        let leafletVersion = layerBaseClass === L.GridLayer ? '1.x' : '0.7.x';\n        let layerClassConfig = {};\n        let setZoomAroundNoMoveEnd, debounceMoveEnd; // alternate zoom functions defined below\n\n        // If extending leaflet 0.7.x TileLayer, additional modifications are needed\n        if (layerBaseClass === L.TileLayer) {\n            layerClassConfig._addTile = function(){};\n            layerClassConfig._removeTile = function(){};\n            layerClassConfig._reset = function() {\n                layerBaseClass.prototype._reset.apply(this, arguments);\n                // re-add the canvas since base class `viewreset` event can remove it\n                if (this.scene && this.scene.container && this.scene.canvas) {\n                    this.scene.container.appendChild(this.scene.canvas);\n                }\n            };\n        }\n\n        // Define custom layer methods\n        Object.assign(layerClassConfig, {\n\n            initialize (options) {\n                // Defaults\n                options.showDebug = (!options.showDebug ? false : true);\n\n                L.setOptions(this, options);\n                this.createScene();\n                this.hooks = {};\n                this._updating_tangram = false;\n                this._zoomAnimated = false; // turn leaflet zoom animations off for this layer\n            },\n\n            createScene () {\n                this.scene = Scene.create(\n                    this.options.scene,\n                    {\n                        numWorkers: this.options.numWorkers,\n                        preUpdate: this.options.preUpdate,\n                        postUpdate: this.options.postUpdate,\n                        continuousZoom: (LeafletLayer.leafletVersion === '1.x'),\n                        wrapView: (this.options.noWrap === true ? false : true),\n                        highDensityDisplay: this.options.highDensityDisplay,\n                        logLevel: this.options.logLevel,\n                        introspection: this.options.introspection,\n                        webGLContextOptions: this.options.webGLContextOptions, // override/supplement WebGL context options\n                        disableRenderLoop: this.options.disableRenderLoop // app must call scene.update() per frame\n                    });\n            },\n\n            // Finish initializing scene and setup events when layer is added to map\n            onAdd (map) {\n                if (!this.scene) {\n                    this.createScene();\n                }\n\n                layerBaseClass.prototype.onAdd.apply(this, arguments);\n\n                this.hooks.resize = () => {\n                    this._updating_tangram = true;\n                    this.updateSize();\n                    this._updating_tangram = false;\n                };\n                map.on('resize', this.hooks.resize);\n\n                this.hooks.move = () => {\n                    if (this._updating_tangram) {\n                        return;\n                    }\n                    this._updating_tangram = true;\n\n                    this.scene.view.setPanning(true);\n                    var view = map.getCenter();\n                    view.zoom = Math.max(Math.min(map.getZoom(), map.getMaxZoom() || Geo.default_view_max_zoom), map.getMinZoom());\n\n                    this.scene.view.setView(view);\n                    if (this._mapLayerCount > 1) {\n                        // if there are other map pane layers active, redraw immediately to stay in better visual sync\n                        // otherwise, wait until next regular animation loop iteration\n                        this.scene.immediateRedraw();\n                    }\n                    this.reverseTransform();\n\n                    this._updating_tangram = false;\n                };\n                map.on('move', this.hooks.move);\n\n                this.hooks.zoomstart = () => {\n                    if (this._updating_tangram) {\n                        return;\n                    }\n\n                    this._updating_tangram = true;\n                    this.scene.view.startZoom();\n                    this._updating_tangram = false;\n                };\n                map.on('zoomstart', this.hooks.zoomstart);\n\n                this.hooks.moveend = () => {\n                    this.scene.view.setPanning(false);\n                    this.scene.requestRedraw();\n                };\n                map.on('moveend', this.hooks.moveend);\n\n                // Modify default Leaflet behaviors\n                this.modifyScrollWheelBehavior(map);\n                this.modifyDoubleClickZoom(map);\n                debounceMoveEnd = debounce(\n                    function(map) {\n                        map._moveEnd(true);\n                        map.fire('viewreset'); // keep other leaflet layers in sync\n                    },\n                    map.options.wheelDebounceTime * 2\n                );\n                this.trackMapLayerCounts(map);\n\n                // Setup feature selection\n                this.setupSelectionEventHandlers(map);\n                this.setSelectionEvents(this.options.events);\n\n                // Add GL canvas to layer container\n                this.scene.container = this.getContainer();\n                this.updateSize();\n\n                // Initial view\n                this.updateView();\n                this.resizeOnFirstVisible();\n\n                // Subscribe to tangram events\n                this.scene.subscribe({\n                    move: this.onTangramViewUpdate.bind(this)\n                });\n\n                // Use leaflet's existing event system as the callback mechanism\n                this.scene.load(this.options.scene,\n                    { config_path: this.options.sceneBasePath, blocking: false }).then(() => {\n\n                    this._updating_tangram = true;\n\n                    this.updateSize();\n                    this.updateView();\n                    this.reverseTransform();\n\n                    this._updating_tangram = false;\n\n                    this.fire('init');\n                }).catch(error => {\n                    this.fire('error', error);\n                });\n            },\n\n            onRemove (map) {\n                layerBaseClass.prototype.onRemove.apply(this, arguments);\n\n                map.off('layeradd layerremove overlayadd overlayremove', this._updateMapLayerCount);\n                map.off('resize', this.hooks.resize);\n                map.off('move', this.hooks.move);\n                map.off('zoomstart', this.hooks.zoomstart);\n                map.off('moveend', this.hooks.moveend);\n                map.off('click', this.hooks.click);\n                map.off('mousemove', this.hooks.mousemove);\n                map.off('mouseout', this.hooks.mouseout);\n                document.removeEventListener('visibilitychange', this.hooks.visibilitychange);\n                this.hooks = {};\n\n                if (this.scene) {\n                    this.scene.destroy();\n                    this.scene = null;\n                }\n            },\n\n            createTile (coords) {\n                var key = coords.x + '/' + coords.y + '/' + coords.z;\n                var div = document.createElement('div');\n                div.setAttribute('data-tile-key', key);\n                div.style.width = '256px';\n                div.style.height = '256px';\n\n                if (this.options.showDebug) {\n                    var debug_overlay = document.createElement('div');\n                    debug_overlay.textContent = key;\n                    debug_overlay.style.position = 'absolute';\n                    debug_overlay.style.left = 0;\n                    debug_overlay.style.top = 0;\n                    debug_overlay.style.color = 'white';\n                    debug_overlay.style.fontSize = '16px';\n                    debug_overlay.style.textOutline = '1px #000000';\n                    debug_overlay.style.padding = '8px';\n\n                    div.appendChild(debug_overlay);\n                    div.style.borderStyle = 'solid';\n                    div.style.borderColor = 'white';\n                    div.style.borderWidth = '1px';\n                }\n\n                return div;\n            },\n\n            // Modify leaflet's default scroll wheel behavior to render frames more frequently\n            // (should generally lead to smoother scroll with Tangram frame re-render)\n            modifyScrollWheelBehavior (map) {\n                if (this.scene.view.continuous_zoom && map.scrollWheelZoom && this.options.modifyScrollWheel !== false) {\n                    map.options.zoomSnap = 0;\n\n                    const enabled = map.scrollWheelZoom.enabled();\n                    map.scrollWheelZoom.disable();\n\n                    // Chrome and Safari have smoother scroll-zoom without actively throttling the mouse wheel,\n                    // while FF and Edge/IE do better with throttling.\n                    // TODO: may be related to syncing differences with requestAnimationFrame loop, investigate further\n                    if (L.Browser.chrome || L.Browser.safari) {\n                        map.scrollWheelZoom._onWheelScroll = function (e) {\n                            var delta = L.DomEvent.getWheelDelta(e);\n                            this._delta += delta;\n                            this._lastMousePos = this._map.mouseEventToContainerPoint(e);\n                            this._performZoom();\n                            L.DomEvent.stop(e);\n                        };\n                    }\n                    else {\n                        map.options.wheelDebounceTime = 20; // better default for FF and Edge/IE\n                    }\n\n                    map.scrollWheelZoom._performZoom = function () {\n                        var map = this._map,\n                            zoom = map.getZoom();\n\n                        map._stop(); // stop panning and fly animations if any\n\n                        var delta = this._delta / (this._map.options.wheelPxPerZoomLevel * 4);\n                        this._delta = 0;\n\n                        if ((zoom + delta) >= this._map.getMaxZoom()) {\n                            delta = this._map.getMaxZoom() - zoom; // don't go past max zoom\n                        }\n                        else if ((zoom + delta) <= this._map.getMinZoom()) {\n                            delta = this._map.getMinZoom() - zoom; // don't go past min zoom\n                        }\n\n                        if (!delta) { return; }\n\n                        if (map.options.scrollWheelZoom === 'center') {\n                            setZoomAroundNoMoveEnd(map, map.getCenter(), zoom + delta);\n                        } else {\n                            setZoomAroundNoMoveEnd(map, this._lastMousePos, zoom + delta);\n                        }\n                        debounceMoveEnd(map);\n                    };\n\n                    if (enabled) {\n                        map.scrollWheelZoom.enable();\n                    }\n                }\n            },\n\n            // Modify leaflet's default double-click zoom behavior, to match typical vector basemap products\n            modifyDoubleClickZoom (map) {\n                if (this.scene.view.continuous_zoom && map.doubleClickZoom && this.options.modifyDoubleClickZoom !== false) {\n\n                    // Simplified version of Leaflet's flyTo, for short animations zooming around a point\n                    const flyAround = function (map, targetCenter, targetZoom, options) {\n                        options = options || {};\n                        if (options.animate === false || !L.Browser.any3d) {\n                            return map.setView(targetCenter, targetZoom, options);\n                        }\n\n                        map._stop();\n\n                        var startZoom = map._zoom;\n\n                        targetCenter = L.latLng(targetCenter);\n                        targetZoom = targetZoom === undefined ? startZoom : targetZoom;\n                        targetZoom = Math.min(targetZoom, map.getMaxZoom()); // don't go past max zoom\n\n                        var from = map.project(map.getCenter(), startZoom),\n                            to = map.project(targetCenter, startZoom);\n\n                        var start = Date.now(),\n                            duration = options.duration ? 1000 * options.duration : 75;\n\n                        function frame() {\n                            var t = (Date.now() - start) / duration;\n\n                            if (t <= 1) {\n                                // reuse internal flyTo frame to ensure these animations are canceled like others\n                                map._flyToFrame = L.Util.requestAnimFrame(frame, map);\n\n                                var center = from.add(to.subtract(from).multiplyBy(t));\n                                center = [center.x, center.y];\n                                center = Geo.metersToLatLng(center);\n                                setZoomAroundNoMoveEnd(map, targetCenter, startZoom + (targetZoom - startZoom) * t);\n                            } else {\n                                setZoomAroundNoMoveEnd(map, targetCenter, targetZoom)\n                                    ._moveEnd(true);\n                            }\n                        }\n\n                        map._moveStart(true);\n\n                        frame.call(map);\n                        return map;\n                    };\n\n                    // Modify the double-click zoom handler to do a short zoom animation\n                    const enabled = map.doubleClickZoom.enabled();\n                    map.doubleClickZoom.disable();\n\n                    map.doubleClickZoom._onDoubleClick = function (e) {\n                        var map = this._map,\n                            oldZoom = map.getZoom(),\n                            delta = map.options.zoomDelta,\n                            zoom = e.originalEvent.shiftKey ? oldZoom - delta : oldZoom + delta;\n\n                        if (map.options.doubleClickZoom === 'center') {\n                            flyAround(map, map.getCenter(), zoom);\n                        } else {\n                            flyAround(map, map.containerPointToLatLng(e.containerPoint), zoom);\n                        }\n                    };\n\n                    if (enabled) {\n                        map.doubleClickZoom.enable();\n                    }\n                }\n            },\n\n            updateView () {\n                var view = this._map.getCenter();\n                view.zoom = Math.max(Math.min(this._map.getZoom(), this._map.getMaxZoom() || Geo.default_view_max_zoom), this._map.getMinZoom());\n                this.scene.view.setView(view);\n            },\n\n            updateSize () {\n                var size = this._map.getSize();\n                this.scene.resizeMap(size.x, size.y);\n            },\n\n            resizeOnFirstVisible () {\n                let first_visibility = true;\n                this.hooks.visibilitychange = () => {\n                    if (first_visibility) {\n                        first_visibility = false;\n                        this.updateSize();\n                    }\n                };\n\n                document.addEventListener('visibilitychange', this.hooks.visibilitychange);\n            },\n\n            onTangramViewUpdate () {\n                if (!this._map || this._updating_tangram) {\n                    return;\n                }\n\n                // View changed?\n                let map_center = this._map.getCenter();\n                let view_center = this.scene.view.center;\n                if (map_center.lng === view_center.lng &&\n                    map_center.lat === view_center.lat &&\n                    this._map.getZoom() === this.scene.view.zoom) {\n                    return;\n                }\n\n                this._updating_tangram = true;\n                this._map.setView([this.scene.view.center.lat, this.scene.view.center.lng], this.scene.view.zoom, { animate: false });\n                this.reverseTransform();\n                this._updating_tangram = false;\n            },\n\n            render () {\n                if (!this.scene) {\n                    return;\n                }\n                this.scene.update();\n            },\n\n            // Reverse the CSS positioning Leaflet applies to the layer, since Tangram's WebGL canvas\n            // is expected to be 'absolutely' positioned.\n            reverseTransform () {\n                if (!this._map || !this.scene || !this.scene.container) {\n                    return;\n                }\n\n                var top_left = this._map.containerPointToLayerPoint([0, 0]);\n                L.DomUtil.setPosition(this.scene.container, top_left);\n            },\n\n            // Tie Leaflet event handlers to Tangram feature selection\n            setupSelectionEventHandlers (map) {\n                this._selection_events = {};\n\n                this.hooks.click = (event) => {\n                    if (typeof this._selection_events.click === 'function') {\n                        this.scene.getFeatureAt(event.containerPoint).\n                            then(selection => {\n                                let results = Object.assign({}, selection, { leaflet_event: event });\n                                this._selection_events.click(results);\n                            });\n                    }\n                };\n                map.on('click', this.hooks.click);\n\n                this.hooks.mousemove = (event) => {\n                    if (typeof this._selection_events.hover === 'function') {\n                        this.scene.getFeatureAt(event.containerPoint).\n                            then(selection => {\n                                let results = Object.assign({}, selection, { leaflet_event: event });\n                                this._selection_events.hover(results);\n                            });\n                    }\n                };\n                map.on('mousemove', this.hooks.mousemove);\n\n                this.hooks.mouseout = (event) => {\n                    // When mouse leaves map, send an additional selection event to indicate no feature is selected\n                    if (typeof this._selection_events.hover === 'function') {\n                        this._selection_events.hover({ changed: true, leaflet_event: event });\n                    }\n                };\n                map.on('mouseout', this.hooks.mouseout);\n            },\n\n            // Set user-defined handlers for feature selection events\n            // Currently only one handler can be defined for each event type\n            // Event types are: `click`, `hover` (leaflet `mousemove`)\n            setSelectionEvents (events) {\n                this._selection_events = Object.assign(this._selection_events, events);\n            },\n\n            // Track the # of layers in the map pane\n            // Used to optimize Tangram redraw sensitivity (redraw more frequently when needing to sync w/other layers)\n            trackMapLayerCounts (map) {\n                this._updateMapLayerCount = () => {\n                    let nodes = map.getPanes().mapPane.childNodes;\n                    this._mapLayerCount = 0;\n                    for (let i=0; i < nodes.length; i++) {\n                        this._mapLayerCount += nodes[i].childNodes.length;\n                    }\n                };\n\n                map.on('layeradd layerremove overlayadd overlayremove', this._updateMapLayerCount);\n                this._updateMapLayerCount();\n            }\n\n        });\n\n        // Modified version of Leaflet's setZoomAround that doesn't trigger a moveEnd event\n        setZoomAroundNoMoveEnd = function (map, latlng, zoom) {\n            var scale = map.getZoomScale(zoom),\n                viewHalf = map.getSize().divideBy(2),\n                containerPoint = latlng instanceof L.Point ? latlng : map.latLngToContainerPoint(latlng),\n\n                centerOffset = containerPoint.subtract(viewHalf).multiplyBy(1 - 1 / scale),\n                newCenter = map.containerPointToLatLng(viewHalf.add(centerOffset));\n\n            return map._move(newCenter, zoom, { flyTo: true });\n        };\n\n        // Create the layer class\n        LeafletLayer = layerBaseClass.extend(layerClassConfig);\n\n        // Polyfill some 1.0 methods\n        if (typeof LeafletLayer.remove !== 'function') {\n            LeafletLayer.prototype.remove = function() {\n                if (this._map) {\n                    this._map.removeLayer(this);\n                }\n                this.fire('remove');\n            };\n        }\n\n        LeafletLayer.layerBaseClass = layerBaseClass;\n        LeafletLayer.leafletVersion = leafletVersion;\n\n        return new LeafletLayer(options);\n    }\n}\n",
     "import ShaderProgram from './gl/shader_program';\nimport GLSL from './gl/glsl';\nimport Geo from './geo';\nimport Vector from './vector';\nimport {StyleParser} from './styles/style_parser';\n\nlet fs = require('fs');\n\nconst shaderSrc_ambientLight = fs.readFileSync(__dirname + '/gl/shaders/ambientLight.glsl', 'utf8');\nconst shaderSrc_directionalLight = fs.readFileSync(__dirname + '/gl/shaders/directionalLight.glsl', 'utf8');\nconst shaderSrc_pointLight = fs.readFileSync(__dirname + '/gl/shaders/pointLight.glsl', 'utf8');\nconst shaderSrc_spotLight = fs.readFileSync(__dirname + '/gl/shaders/spotLight.glsl', 'utf8');\n\n// Abstract light\nexport default class Light {\n\n    constructor (view, config) {\n        this.name = config.name;\n        this.view = view;\n\n        if (config.ambient == null || typeof config.ambient === 'number') {\n            this.ambient = GLSL.expandVec3(config.ambient || 0);\n        }\n        else {\n            this.ambient = StyleParser.parseColor(config.ambient).slice(0, 3);\n        }\n\n        if (config.diffuse == null || typeof config.diffuse === 'number') {\n            this.diffuse = GLSL.expandVec3(config.diffuse != null ? config.diffuse : 1);\n        }\n        else {\n            this.diffuse = StyleParser.parseColor(config.diffuse).slice(0, 3);\n        }\n\n        if (config.specular == null || typeof config.specular === 'number') {\n            this.specular = GLSL.expandVec3(config.specular || 0);\n        }\n        else {\n            this.specular = StyleParser.parseColor(config.specular).slice(0, 3);\n        }\n    }\n\n    // Create a light by type name, factory-style\n    // 'config' must include 'name' and 'type', along with any other type-specific properties\n    static create (view, config) {\n        if (Light.types[config.type]) {\n            return new Light.types[config.type](view, config);\n        }\n    }\n\n    // Set light for a style: fragment lighting, vertex lighting, or none\n    static setMode (mode, style) {\n        if (mode === true) {\n            mode = 'fragment';\n        }\n        mode = Light.enabled && ((mode != null) ? mode : 'fragment'); // default to fragment lighting\n        style.defines['TANGRAM_LIGHTING_FRAGMENT'] = (mode === 'fragment');\n        style.defines['TANGRAM_LIGHTING_VERTEX'] = (mode === 'vertex');\n    }\n\n    // Inject all provided light definitions, and calculate cumulative light function\n    static inject (lights) {\n        // Clear previous injections\n        ShaderProgram.removeBlock(Light.block);\n\n        // If lighting is globally disabled, nothing is injected (mostly for debugging or live editing)\n        if (!Light.enabled) {\n            return;\n        }\n\n        // Construct code to calculate each light instance\n        let calculateLights = \"\";\n        if (lights && Object.keys(lights).length > 0) {\n            // Collect uniques types of lights\n            let types = {};\n            for (let light_name in lights) {\n                types[lights[light_name].type] = true;\n            }\n\n            // Inject each type of light\n            for (let type in types) {\n                Light.types[type].inject();\n            }\n\n            // Inject per-instance blocks and construct the list of functions to calculate each light\n            for (let light_name in lights) {\n                // Define instance\n                lights[light_name].inject();\n\n                // Add the calculation function to the list\n                calculateLights += `calculateLight(${light_name}, _eyeToPoint, _normal);\\n`;\n            }\n        }\n\n        // Glue together the final lighting function that sums all the lights\n        let calculateFunction = `\n            vec4 calculateLighting(in vec3 _eyeToPoint, in vec3 _normal, in vec4 _color) {\n\n                // Do initial material calculations over normal, emission, ambient, diffuse and specular values\n                calculateMaterial(_eyeToPoint,_normal);\n\n                // Un roll the loop of individual ligths to calculate\n                ${calculateLights}\n\n                //  Final light intensity calculation\n                vec4 color = vec4(vec3(0.), _color.a); // start with vertex color alpha\n\n                #ifdef TANGRAM_MATERIAL_EMISSION\n                    color.rgb = material.emission.rgb;\n                    color.a *= material.emission.a;\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_AMBIENT\n                    color.rgb += light_accumulator_ambient.rgb * _color.rgb * material.ambient.rgb;\n                    color.a *= material.ambient.a;\n                #else\n                    #ifdef TANGRAM_MATERIAL_DIFFUSE\n                        color.rgb += light_accumulator_ambient.rgb * _color.rgb * material.diffuse.rgb;\n                    #endif\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_DIFFUSE\n                    color.rgb += light_accumulator_diffuse.rgb * _color.rgb * material.diffuse.rgb;\n                    color.a *= material.diffuse.a;\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_SPECULAR\n                    color.rgb += light_accumulator_specular.rgb * material.specular.rgb;\n                    color.a *= material.specular.a;\n                #endif\n\n                // Clamp final color\n                color = clamp(color, 0.0, 1.0);\n\n                return color;\n            }`;\n\n        ShaderProgram.addBlock(Light.block, calculateFunction);\n    }\n\n    // Common instance definition\n    inject () {\n        let instance =  `\n            uniform ${this.struct_name} u_${this.name};\n            ${this.struct_name} ${this.name};\n            `;\n        let assign = `\n            ${this.name} = u_${this.name};\\n\n        `;\n\n        ShaderProgram.addBlock(Light.block, instance);\n        ShaderProgram.addBlock('setup', assign);\n    }\n\n    // Update method called once per frame\n    update () {\n    }\n\n    // Called once per frame per program (e.g. for main render pass, then for each additional\n    // pass for feature selection, etc.)\n    setupProgram (_program) {\n        //  Three common light properties\n        _program.uniform('3fv', `u_${this.name}.ambient`, this.ambient);\n        _program.uniform('3fv', `u_${this.name}.diffuse`, this.diffuse);\n        _program.uniform('3fv', `u_${this.name}.specular`, this.specular);\n    }\n\n}\n\nLight.types = {}; // references to subclasses by short name\nLight.block = 'lighting'; // shader block name\nLight.enabled = true; // lighting can be globally enabled/disabled\n\n\n// Light subclasses\nclass AmbientLight extends Light {\n\n    constructor(view, config) {\n        super(view, config);\n        this.type = 'ambient';\n        this.struct_name = 'AmbientLight';\n    }\n\n    // Inject struct and calculate function\n    static inject() {\n        ShaderProgram.addBlock(Light.block, shaderSrc_ambientLight);\n    }\n\n    setupProgram (_program) {\n        _program.uniform('3fv', `u_${this.name}.ambient`, this.ambient);\n    }\n\n}\nLight.types['ambient'] = AmbientLight;\n\nclass DirectionalLight extends Light {\n\n    constructor(view, config) {\n        super(view, config);\n        this.type = 'directional';\n        this.struct_name = 'DirectionalLight';\n\n        if (config.direction) {\n            this._direction = config.direction;\n        }\n        else {\n            // Default directional light maintains full intensity on ground, with basic extrusion shading\n            let theta = 135; // angle of light in xy plane (rotated around z axis)\n            let scale = Math.sin(Math.PI*60/180); // scaling factor to keep total directional intensity to 0.5\n            this._direction = [\n                Math.cos(Math.PI*theta/180) * scale,\n                Math.sin(Math.PI*theta/180) * scale,\n                -0.5\n            ];\n\n            if (config.ambient == null) {\n                this.ambient = GLSL.expandVec3(0.5);\n            }\n        }\n        this.direction = this._direction.map(parseFloat);\n    }\n\n    get direction () {\n        return this._direction;\n    }\n\n    set direction (v) {\n        this._direction = Vector.normalize(v);\n    }\n\n    // Inject struct and calculate function\n    static inject() {\n        ShaderProgram.addBlock(Light.block, shaderSrc_directionalLight);\n    }\n\n    setupProgram (_program) {\n        super.setupProgram(_program);\n        _program.uniform('3fv', `u_${this.name}.direction`, this.direction);\n    }\n\n}\nLight.types['directional'] = DirectionalLight;\n\n\nclass PointLight extends Light {\n\n    constructor (view, config) {\n        super(view, config);\n        this.type = 'point';\n        this.struct_name = 'PointLight';\n\n        this.position = config.position || [0, 0, '100px'];\n        this.position_eye = []; // position in eyespace\n        this.origin = config.origin || 'ground';\n        this.attenuation = !isNaN(parseFloat(config.attenuation)) ? parseFloat(config.attenuation) : 0;\n\n        if (config.radius) {\n            if (Array.isArray(config.radius) && config.radius.length === 2) {\n                this.radius = config.radius;\n            }\n            else {\n                this.radius = [null, config.radius];\n            }\n        }\n        else {\n            this.radius = null;\n        }\n    }\n\n    // Inject struct and calculate function\n    static inject () {\n        ShaderProgram.addBlock(Light.block, shaderSrc_pointLight);\n    }\n\n    // Inject isntance-specific settings\n    inject() {\n        super.inject();\n\n        ShaderProgram.defines['TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT'] = (this.attenuation !== 0);\n        ShaderProgram.defines['TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS'] = (this.radius != null && this.radius[0] != null);\n        ShaderProgram.defines['TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS'] = (this.radius != null);\n    }\n\n    update () {\n        this.updateEyePosition();\n    }\n\n    updateEyePosition () {\n        if (this.origin === 'world') {\n            // For world origin, format is: [longitude, latitude, meters (default) or pixels w/px units]\n\n            // Move light's world position into camera space\n            let [x, y] = Geo.latLngToMeters(this.position);\n            this.position_eye[0] = x - this.view.camera.position_meters[0];\n            this.position_eye[1] = y - this.view.camera.position_meters[1];\n\n            this.position_eye[2] = StyleParser.convertUnits(this.position[2],\n                { zoom: this.view.zoom, meters_per_pixel: Geo.metersPerPixel(this.view.zoom) });\n            this.position_eye[2] = this.position_eye[2] - this.view.camera.position_meters[2];\n        }\n        else if (this.origin === 'ground' || this.origin === 'camera') {\n            // For camera or ground origin, format is: [x, y, z] in meters (default) or pixels w/px units\n\n            // Light is in camera space by default\n            this.position_eye = StyleParser.convertUnits(this.position,\n                { zoom: this.view.zoom, meters_per_pixel: Geo.metersPerPixel(this.view.zoom) });\n\n            if (this.origin === 'ground') {\n                // Leave light's xy in camera space, but z needs to be moved relative to ground plane\n                this.position_eye[2] = this.position_eye[2] - this.view.camera.position_meters[2];\n            }\n        }\n        this.position_eye[3] = 1;\n    }\n\n    setupProgram (_program) {\n        super.setupProgram(_program);\n\n        _program.uniform('4fv', `u_${this.name}.position`, this.position_eye);\n\n        if(ShaderProgram.defines['TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT']) {\n            _program.uniform('1f', `u_${this.name}.attenuationExponent`, this.attenuation);\n        }\n\n        if(ShaderProgram.defines['TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS']) {\n            _program.uniform('1f', `u_${this.name}.innerRadius`,\n                StyleParser.convertUnits(this.radius[0],\n                    { zoom: this.view.zoom, meters_per_pixel: Geo.metersPerPixel(this.view.zoom) }));\n        }\n\n        if(ShaderProgram.defines['TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS']) {\n            _program.uniform('1f', `u_${this.name}.outerRadius`,\n                StyleParser.convertUnits(this.radius[1],\n                    { zoom: this.view.zoom, meters_per_pixel: Geo.metersPerPixel(this.view.zoom) }));\n        }\n    }\n}\nLight.types['point'] = PointLight;\n\n\nclass SpotLight extends PointLight {\n\n    constructor (view, config) {\n        super(view, config);\n        this.type = 'spotlight';\n        this.struct_name = 'SpotLight';\n\n        this.direction = this._direction = (config.direction || [0, 0, -1]).map(parseFloat); // [x, y, z]\n        this.exponent = config.exponent ? parseFloat(config.exponent) : 0.2;\n        this.angle = config.angle ? parseFloat(config.angle) : 20;\n    }\n\n    get direction () {\n        return this._direction;\n    }\n\n    set direction (v) {\n        this._direction = Vector.normalize(v);\n    }\n\n    // Inject struct and calculate function\n    static inject () {\n        ShaderProgram.addBlock(Light.block, shaderSrc_spotLight);\n    }\n\n    setupProgram (_program) {\n        super.setupProgram(_program);\n\n        _program.uniform('3fv', `u_${this.name}.direction`, this.direction);\n        _program.uniform('1f', `u_${this.name}.spotCosCutoff`, Math.cos(this.angle * 3.14159 / 180));\n        _program.uniform('1f', `u_${this.name}.spotExponent`, this.exponent);\n    }\n\n}\nLight.types['spotlight'] = SpotLight;\n",
     "import GLSL from './gl/glsl';\nimport {StyleParser} from './styles/style_parser';\n\nlet fs = require('fs');\nconst shaderSrc_material = fs.readFileSync(__dirname + '/gl/shaders/material.glsl', 'utf8');\n\nconst material_props = ['emission', 'ambient', 'diffuse', 'specular'];\n\nexport default class Material {\n    constructor (config) {\n\n        config = config || {};\n\n        // These properties all have the same defaults, so they can be set in bulk\n        material_props.forEach(prop => {\n            const value = config[prop];\n            if (value != null) {\n                if (value.texture) {\n                    this[prop] = {\n                        texture: value.texture,\n                        mapping: value.mapping || 'spheremap',\n                        scale: GLSL.expandVec3(value.scale != null ? value.scale : 1),\n                        amount: GLSL.expandVec4(value.amount != null ? value.amount : 1)\n                    };\n                }\n                else if (typeof value === 'number' || Array.isArray(value)) {\n                    this[prop] = { amount: GLSL.expandVec4(value) };\n                }\n                else if (typeof value === 'string') {\n                    this[prop] = { amount: StyleParser.parseColor(value) };\n                }\n                else {\n                    this[prop] = value;\n                }\n            }\n        });\n\n        // Extra specular props\n        if (this.specular) {\n            this.specular.shininess = config.shininess ? parseFloat(config.shininess) : 0.2;\n        }\n\n        // Normal mapping\n        if (config.normal != null) {\n            this.normal = {\n                texture: config.normal.texture,\n                mapping: config.normal.mapping || 'triplanar',\n                scale: GLSL.expandVec3(config.normal.scale != null ? config.normal.scale : 1),\n                amount: config.normal.amount != null ? config.normal.amount : 1\n            };\n        }\n    }\n\n    // Determine if a material config block has sufficient properties to create a material\n    static isValid (config) {\n        if (config == null) {\n            return false;\n        }\n\n        if (config.emission == null &&\n            config.ambient == null &&\n            config.diffuse == null &&\n            config.specular == null) {\n            return false;\n        }\n\n        return true;\n    }\n\n    inject (style) {\n        // For each property, sets defines to configure texture mapping, with a pattern like:\n        //   TANGRAM_MATERIAL_DIFFUSE, TANGRAM_MATERIAL_DIFFUSE_TEXTURE, TANGRAM_MATERIAL_DIFFUSE_TEXTURE_SPHEREMAP\n        // Also sets flags to keep track of each unique mapping type being used, e.g.:\n        //   TANGRAM_MATERIAL_TEXTURE_SPHEREMAP\n        // Enables texture coordinates if needed and not already on\n        material_props.forEach(prop => {\n            let def = `TANGRAM_MATERIAL_${prop.toUpperCase()}`;\n            let texdef = def + '_TEXTURE';\n            style.defines[def] = (this[prop] != null);\n            if (this[prop] && this[prop].texture) {\n                style.defines[texdef] = true;\n                style.defines[texdef + '_' + this[prop].mapping.toUpperCase()] = true;\n                style.defines[`TANGRAM_MATERIAL_TEXTURE_${this[prop].mapping.toUpperCase()}`] = true;\n                style.texcoords = style.texcoords || (this[prop].mapping === 'uv');\n            }\n        });\n\n        // Normal mapping\n        // As anove, sets flags to keep track of each unique mapping type being used, e.g.:\n        //   TANGRAM_MATERIAL_TEXTURE_SPHEREMAP\n        if (this.normal && this.normal.texture) {\n            style.defines['TANGRAM_MATERIAL_NORMAL_TEXTURE'] = true;\n            style.defines['TANGRAM_MATERIAL_NORMAL_TEXTURE_' + this.normal.mapping.toUpperCase()] = true;\n            style.defines[`TANGRAM_MATERIAL_TEXTURE_${this.normal.mapping.toUpperCase()}`] = true;\n            style.texcoords = style.texcoords || (this.normal.mapping === 'uv');\n        }\n\n        style.replaceShaderBlock(Material.block, shaderSrc_material, 'Material');\n        style.addShaderBlock('setup', '\\nmaterial = u_material;\\n', 'Material');\n    }\n\n    setupProgram (_program) {\n        // For each property, sets uniforms in the pattern:\n        // u_material.diffuse, u_material.diffuseScale u_material_diffuse_texture\n        material_props.forEach(prop => {\n            if (this[prop]) {\n                if (this[prop].texture) {\n                    _program.setTextureUniform(`u_material_${prop}_texture`, this[prop].texture);\n                    _program.uniform('3fv', `u_material.${prop}Scale`, this[prop].scale);\n                    _program.uniform('4fv', `u_material.${prop}`, this[prop].amount);\n                } else if (this[prop].amount) {\n                    _program.uniform('4fv', `u_material.${prop}`, this[prop].amount);\n                }\n            }\n        });\n\n        // Extra specular props\n        if (this.specular) {\n            _program.uniform('1f', 'u_material.shininess', this.specular.shininess);\n        }\n\n        // Normal mapping\n        if (this.normal && this.normal.texture) {\n            _program.setTextureUniform('u_material_normal_texture', this.normal.texture);\n            _program.uniform('3fv', 'u_material.normalScale', this.normal.scale);\n            _program.uniform('1f', 'u_material.normalAmount', this.normal.amount);\n        }\n    }\n}\n\nMaterial.block = 'material';\n",
-    "/*jshint worker: true*/\n\nimport './utils/polyfills';\n\n// The leaflet layer plugin is currently the primary public API\nimport {leafletLayer} from './leaflet_layer';\n\n// The scene worker is only activated when a worker thread is instantiated, but must always be loaded\nimport Scene from './scene';\nimport {SceneWorker} from './scene_worker';\n\n// Additional modules are exposed for debugging\nimport version from './utils/version';\nimport log from './utils/log';\nimport Thread from './utils/thread';\nimport Utils from './utils/utils';\nimport Geo from './geo';\nimport Vector from './vector';\nimport DataSource from './sources/data_source';\nimport './sources/geojson';\nimport './sources/topojson';\nimport './sources/mvt';\nimport './sources/raster';\nimport GLSL from './gl/glsl';\nimport ShaderProgram from './gl/shader_program';\nimport VertexData from './gl/vertex_data';\nimport Texture from './gl/texture';\nimport Material from './material';\nimport Light from './light';\nimport WorkerBroker from './utils/worker_broker';\nimport {layer_cache} from './styles/layer';\nimport {StyleManager} from './styles/style_manager';\nimport {StyleParser} from './styles/style_parser';\nimport Collision from './labels/collision';\nimport FeatureSelection from './selection';\nimport CanvasText from './styles/text/canvas_text';\nimport debugSettings from './utils/debug_settings';\n\nimport yaml from 'js-yaml';\nimport JSZip from 'jszip';\n\n// Make some modules accessible for debugging\nvar debug = {\n    log,\n    yaml,\n    Thread,\n    Utils,\n    Geo,\n    Vector,\n    DataSource,\n    GLSL,\n    ShaderProgram,\n    VertexData,\n    Texture,\n    Material,\n    Light,\n    Scene,\n    SceneWorker,\n    WorkerBroker,\n    layer_cache,\n    StyleManager,\n    StyleParser,\n    Collision,\n    FeatureSelection,\n    CanvasText,\n    debugSettings\n};\n\nif (Thread.is_main) {\n    Utils.requestAnimationFramePolyfill();\n\n    // Attach Promise polyfill to window\n    // Allows FontFaceObserver to use polyfill (without needing to include its own duplicate polyfill)\n    if (window.Promise === undefined) {\n        window.Promise = Promise;\n        JSZip.external.Promise = Promise;\n    }\n}\n\nmodule.exports = {\n    leafletLayer,\n    debug,\n    version\n};\n",
-    "import log from './utils/log';\nimport Utils from './utils/utils';\nimport * as URLs from './utils/urls';\nimport WorkerBroker from './utils/worker_broker';\nimport subscribeMixin from './utils/subscribe';\nimport Context from './gl/context';\nimport Texture from './gl/texture';\nimport ShaderProgram from './gl/shader_program';\nimport VertexArrayObject from './gl/vao';\nimport {StyleManager} from './styles/style_manager';\nimport {Style} from './styles/style';\nimport {StyleParser} from './styles/style_parser';\nimport SceneLoader from './scene_loader';\nimport View from './view';\nimport Light from './light';\nimport TileManager from './tile_manager';\nimport DataSource from './sources/data_source';\nimport FeatureSelection from './selection';\nimport RenderStateManager from './gl/render_state';\nimport FontManager from './styles/text/font_manager';\nimport MediaCapture from './utils/media_capture';\n\n// Load scene definition: pass an object directly, or a URL as string to load remotely\nexport default class Scene {\n\n    constructor(config_source, options) {\n        options = options || {};\n        subscribeMixin(this);\n\n        this.id = Scene.id++;\n        this.initialized = false;\n        this.initializing = null; // will be a promise that resolves when scene is loaded\n        this.sources = {};\n\n        this.view = new View(this, options);\n        this.tile_manager = new TileManager({ scene: this, view: this.view });\n        this.num_workers = options.numWorkers || 2;\n        if (options.disableVertexArrayObjects === true) {\n            VertexArrayObject.disabled = true;\n        }\n\n        Utils.use_high_density_display = options.highDensityDisplay !== undefined ? options.highDensityDisplay : true;\n        Utils.updateDevicePixelRatio();\n\n        this.config = null;\n        this.config_source = config_source;\n        this.config_bundle = null;\n        this.last_valid_config_source = null;\n\n        this.styles = null;\n        this.style_manager = new StyleManager();\n\n        this.building = null;                           // tracks current scene building state (tiles being built, etc.)\n        this.dirty = true;                              // request a redraw\n        this.animated = false;                          // request redraw every frame\n        this.preUpdate = options.preUpdate;             // optional pre-render loop hook\n        this.postUpdate = options.postUpdate;           // optional post-render loop hook\n        this.render_loop = !options.disableRenderLoop;  // disable render loop - app will have to manually call Scene.render() per frame\n        this.render_loop_active = false;\n        this.render_loop_stop = false;\n        this.render_count = 0;\n        this.last_render_count = 0;\n        this.render_count_changed = false;\n        this.frame = 0;\n        this.last_main_render = -1;         // frame counter for last main render pass\n        this.last_selection_render = -1;    // frame counter for last selection render pass\n        this.media_capture = new MediaCapture();\n        this.selection = null;\n        this.introspection = false;\n        this.resetTime();\n\n        this.container = options.container;\n\n        this.lights = null;\n        this.background = null;\n\n        this.createListeners();\n        this.updating = 0;\n        this.generation = Scene.generation; // an id that is incremented each time the scene config is invalidated\n        this.last_complete_generation = Scene.generation; // last generation id with a complete view\n        this.setupDebug();\n\n        this.log_level = options.logLevel || 'warn';\n        log.setLevel(this.log_level);\n        log.reset();\n    }\n\n    static create (config, options = {}) {\n        return new Scene(config, options);\n    }\n\n    // Load scene (or reload existing scene if no new source specified)\n    // Options:\n    //   `config_path`: base URL against which roo scene resources should be resolved (useful for Play) (default nulll)\n    //   `blocking`: should rendering block on scene load completion (default true)\n    load(config_source = null, options = {}) {\n        if (this.initializing) {\n            return this.initializing;\n        }\n        log.reset();\n\n        this.updating++;\n        this.initialized = false;\n\n        // Backwards compatibilty for passing `config_path` string as second argument\n        // (since transitioned to using options argument to accept more parameters)\n        options = (typeof options === 'string') ? { config_path: options } : options;\n        let config_path = options.config_path;\n\n        // Should rendering block on load (not desirable for initial load, often desired for live style-switching)\n        options.blocking = (options.blocking !== undefined) ? options.blocking : true;\n\n        // Load scene definition (sources, styles, etc.), then create styles & workers\n        this.createCanvas();\n        this.initializing = this.loadScene(config_source, config_path)\n            .then(() => this.createWorkers())\n            .then(() => {\n                this.resetFeatureSelection();\n\n                // Scene loaded from a JS object, or modified by a `load` event, may contain compiled JS functions\n                // which need to be serialized, while one loaded only from a URL does not.\n                const serialize_funcs = ((typeof this.config_source === 'object') || this.hasSubscribersFor('load'));\n\n                const updating = this.updateConfig({ serialize_funcs, load_event: true, fade_in: true });\n                if (options.blocking === true) {\n                    return updating;\n                }\n            }).then(() => {\n                this.updating--;\n                this.initializing = null;\n                this.initialized = true;\n                this.last_valid_config_source = this.config_source;\n                this.last_valid_config_path = this.config_path;\n\n                if (this.render_loop !== false) {\n                    this.setupRenderLoop();\n                }\n                this.requestRedraw();\n        }).catch(error => {\n            this.initializing = null;\n            this.updating = 0;\n\n            // Report and revert to last valid config if available\n            let type, message;\n            if (error.name === 'YAMLException') {\n                type = 'yaml';\n                message = 'Error parsing scene YAML';\n            }\n            else {\n                // TODO: more error types\n                message = 'Error initializing scene';\n            }\n            this.trigger('error', { type, message, error, url: this.config_source });\n\n            message = `Scene.load() failed to load ${this.config_source}: ${error.message}`;\n            if (this.last_valid_config_source) {\n                log('warn', message, error);\n                log('info', `Scene.load() reverting to last valid configuration`);\n                return this.load(this.last_valid_config_source, this.last_valid_config_path);\n            }\n            log('error', message, error);\n            throw error;\n        });\n\n        return this.initializing;\n    }\n\n    destroy() {\n        this.initialized = false;\n        this.render_loop_stop = true; // schedule render loop to stop\n\n        this.destroyListeners();\n\n        if (this.canvas && this.canvas.parentNode) {\n            this.canvas.parentNode.removeChild(this.canvas);\n            this.canvas = null;\n        }\n        this.container = null;\n\n        if (this.selection) {\n            this.selection.destroy();\n        }\n\n        if (this.gl) {\n            Texture.destroy(this.gl);\n            this.style_manager.destroy(this.gl);\n            this.styles = {};\n\n            ShaderProgram.reset();\n\n            // Force context loss\n            let ext = this.gl.getExtension('WEBGL_lose_context');\n            if (ext) {\n                ext.loseContext();\n            }\n\n            this.gl = null;\n        }\n\n        this.sources = {};\n\n        this.destroyWorkers();\n        this.tile_manager.destroy();\n        this.tile_manager = null;\n        log.reset();\n    }\n\n    createCanvas() {\n        if (this.canvas) {\n            return;\n        }\n\n        this.container = this.container || document.body;\n        this.canvas = document.createElement('canvas');\n        this.canvas.style.position = 'absolute';\n        this.canvas.style.top = 0;\n        this.canvas.style.left = 0;\n\n        // Force tangram canvas underneath all leaflet layers, and set background to transparent\n        this.container.style.backgroundColor = 'transparent';\n        this.container.appendChild(this.canvas);\n\n        try {\n            this.gl = Context.getContext(this.canvas, {\n                alpha: true, premultipliedAlpha: true, // TODO: vary w/scene alpha\n                device_pixel_ratio: Utils.device_pixel_ratio\n            });\n        }\n        catch(e) {\n            throw new Error(\n                \"Couldn't create WebGL context. \" +\n                \"Your browser may not support WebGL, or it's turned off? \" +\n                \"Visit http://webglreport.com/ for more info.\"\n            );\n        }\n\n        this.resizeMap(this.container.clientWidth, this.container.clientHeight);\n        VertexArrayObject.init(this.gl);\n        this.render_states = new RenderStateManager(this.gl);\n        this.media_capture.setCanvas(this.canvas);\n    }\n\n    // Get the URL to load the web worker from\n    getWorkerUrl() {\n        let worker_url;\n        /* jshint -W117 */\n        // ignore uninitialized worker src variable (defined in parent scope)\n        if (typeof __worker_src__ !== \"undefined\"){\n            // load from source object using browserify shim (preferred)\n            var src_map_url = '\\n//#' + ' sourceMappingURL=' + __worker_src_origin__ + '.map';\n            worker_url = URLs.createObjectURL(new Blob(['(' + __worker_src__ + ')()' + src_map_url], { type: 'application/javascript' }));\n        }\n        /* jshint +W117 */\n\n        if (!worker_url) {\n            throw new Error(\"Couldn't find internal Tangram source variable (may indicate the library did not build correctly)\");\n        }\n\n        // Import custom data source scripts alongside core library\n        // NOTE: workaround for issue where large libraries intermittently fail to load in web workers,\n        // when multiple importScripts() calls are used. Loading all scripts (including Tangram itself)\n        // in one call at at worker creation time has not exhibited the same issue.\n        let urls = [...this.data_source_scripts];\n        urls.push(worker_url); // load Tangram *last* (has been more reliable, though reason unknown)\n        let body = `importScripts(${urls.map(url => `'${url}'`).join(',')});`;\n        return URLs.createObjectURL(new Blob([body], { type: 'application/javascript' }));\n    }\n\n    // Update list of any custom data source scripts (if any)\n    updateDataSourceScripts () {\n        let prev_scripts = [...(this.data_source_scripts||[])]; // save list of previously loaded scripts\n        let scripts = Object.keys(this.config.sources).map(s => this.config.sources[s].scripts).filter(x => x);\n        if (scripts.length > 0) {\n            log('debug', 'loading custom data source scripts in worker:', scripts);\n        }\n        this.data_source_scripts = [].concat(...scripts).sort();\n\n        // Scripts changed?\n        return !(this.data_source_scripts.length === prev_scripts.length &&\n            this.data_source_scripts.every((v, i) => v === prev_scripts[i]));\n    }\n\n    // Web workers handle heavy duty tile construction: networking, geometry processing, etc.\n    createWorkers() {\n        // Reset old workers (if any) if we need to re-instantiate with new external scripts\n        if (this.updateDataSourceScripts()) {\n            this.destroyWorkers();\n        }\n\n        if (!this.workers) {\n            return this.makeWorkers(this.getWorkerUrl());\n        }\n        return Promise.resolve();\n    }\n\n    // Instantiate workers from URL, init event handlers\n    makeWorkers(url) {\n        var queue = [];\n\n        this.workers = [];\n        for (var id=0; id < this.num_workers; id++) {\n            var worker = new Worker(url);\n            this.workers[id] = worker;\n\n            WorkerBroker.addWorker(worker);\n\n            log('debug', `Scene.makeWorkers: initializing worker ${id}`);\n            let _id = id;\n            queue.push(WorkerBroker.postMessage(worker, 'self.init', this.id, id, this.num_workers, this.log_level, Utils.device_pixel_ratio).then(\n                (id) => {\n                    log('debug', `Scene.makeWorkers: initialized worker ${id}`);\n                    return id;\n                },\n                (error) => {\n                    log('error', `Scene.makeWorkers: failed to initialize worker ${_id}:`, error);\n                    return Promise.reject(error);\n                })\n            );\n        }\n\n        this.next_worker = 0;\n        return Promise.all(queue).then(() => {\n            log.setWorkers(this.workers);\n\n            // Let VertexElements know if 32 bit indices for element arrays are available\n            let Uint32_flag = this.gl.getExtension(\"OES_element_index_uint\") ? true : false;\n            WorkerBroker.postMessage(this.workers, 'VertexElements.setUint32Flag', Uint32_flag);\n\n            // Free memory after worker initialization\n            URLs.revokeObjectURL(url);\n        });\n    }\n\n    destroyWorkers() {\n        if (Array.isArray(this.workers)) {\n            log.setWorkers(null);\n            this.workers.forEach((worker) => {\n                worker.terminate();\n            });\n            this.workers = null;\n        }\n    }\n\n    // Assign tile to worker thread based on data source\n    getWorkerForDataSource(source) {\n        let worker;\n\n        if (source.tiled) {\n            // Round robin tiled sources across all workers\n            worker = this.workers[this.next_worker];\n            this.next_worker = (this.next_worker + 1) % this.workers.length;\n        }\n        else {\n            // Pin all tiles from each non-tiled source to a single worker\n            // Prevents data for these sources from being loaded more than once\n            worker = this.workers[source.id % this.workers.length];\n        }\n\n        return worker;\n    }\n\n    // Scene is ready for rendering\n    ready() {\n        if (!this.view.ready() || Object.keys(this.sources).length === 0) {\n             return false;\n        }\n        return true;\n    }\n\n    // Resize the map when device pixel ratio changes, e.g. when switching between displays\n    updateDevicePixelRatio () {\n        if (Utils.updateDevicePixelRatio()) {\n            WorkerBroker.postMessage(this.workers, 'self.updateDevicePixelRatio', Utils.device_pixel_ratio)\n                .then(() => this.rebuild())\n                .then(() => this.resizeMap(this.view.size.css.width, this.view.size.css.height));\n        }\n    }\n\n    resizeMap(width, height) {\n        if (width === 0 && height === 0) {\n            return;\n        }\n\n        this.dirty = true;\n        this.view.setViewportSize(width, height);\n        if (this.gl) {\n            Context.resize(this.gl, width, height, Utils.device_pixel_ratio);\n        }\n    }\n\n    // Request scene be redrawn at next animation loop\n    requestRedraw() {\n        this.dirty = true;\n    }\n\n    // Redraw scene immediately - don't wait for animation loop\n    // Use sparingly, but for cases where you need the closest possible sync with other UI elements,\n    // such as other, non-WebGL map layers (e.g. Leaflet raster layers, markers, etc.)\n    immediateRedraw() {\n        this.dirty = true;\n        this.update();\n    }\n\n    renderLoop () {\n        this.render_loop_active = true; // only let the render loop instantiate once\n\n        if (this.initialized) {\n            // Render the scene\n            this.update();\n        }\n\n        // Request the next frame if not scheduled to stop\n        if (!this.render_loop_stop) {\n            window.requestAnimationFrame(this.renderLoop.bind(this));\n        }\n        else {\n            this.render_loop_stop = false;\n            this.render_loop_active = false;\n        }\n    }\n\n    // Setup the render loop\n    setupRenderLoop() {\n        if (!this.render_loop_active) {\n            setTimeout(() => { this.renderLoop(); }, 0); // delay start by one tick\n        }\n    }\n\n    update() {\n        // Determine which passes (if any) to render\n        let main = this.dirty;\n        let selection = this.selection ? this.selection.hasPendingRequests() : false;\n        var will_render = !(\n            (main === false && selection === false) ||\n            this.initialized === false ||\n            this.updating > 0 ||\n            this.ready() === false\n        );\n\n        // Pre-render loop hook\n        if (typeof this.preUpdate === 'function') {\n            this.preUpdate(will_render);\n        }\n\n        // Bail if no need to render\n        if (!will_render) {\n            return false;\n        }\n        this.dirty = false; // subclasses can set this back to true when animation is needed\n\n        // Render the scene\n        this.updateDevicePixelRatio();\n        this.render({ main, selection });\n        this.updateViewComplete(); // fires event when rendered tile set or style changes\n        this.media_capture.completeScreenshot(); // completes screenshot capture if requested\n\n        // Post-render loop hook\n        if (typeof this.postUpdate === 'function') {\n            this.postUpdate(will_render);\n        }\n\n        // Redraw every frame if animating\n        if (this.animated === true || this.view.isAnimating()) {\n            this.dirty = true;\n        }\n\n        this.frame++;\n        log('trace', 'Scene.render()');\n        return true;\n    }\n\n    // Accepts flags indicating which render passes should be made\n    render({ main, selection }) {\n        var gl = this.gl;\n\n        // Update styles, camera, lights\n        this.view.update();\n        Object.keys(this.lights).forEach(i => this.lights[i].update());\n\n        // Render main pass\n        if (main) {\n            this.render_count = this.renderPass();\n            this.last_main_render = this.frame;\n        }\n\n        // Render selection pass (if needed)\n        if (selection) {\n            if (this.view.panning || this.view.zooming) {\n                this.selection.clearPendingRequests();\n                return;\n            }\n\n            // Only re-render if selection buffer is out of date (relative to main render buffer)\n            // and not locked (e.g. no tiles are actively building)\n            if (!this.selection.locked && this.last_selection_render < this.last_main_render) {\n                this.selection.bind();          // switch to FBO\n                this.renderPass(\n                    'selection_program',        // render w/alternate program\n                    { allow_blend: false });\n\n                // Reset to screen buffer\n                gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n                gl.viewport(0, 0, this.canvas.width, this.canvas.height);\n                this.last_selection_render = this.frame;\n            }\n\n            this.selection.read(); // process any pending results from selection buffer\n        }\n\n        this.render_count_changed = false;\n        if (this.render_count !== this.last_render_count) {\n            this.render_count_changed = true;\n\n            this.getFeatureSelectionMapSize().then(size => {\n                if (size) { // returns undefined if previous request pending\n                    log('info', `Scene: rendered ${this.render_count} primitives (${size} features in selection map)`);\n                }\n            });\n        }\n        this.last_render_count = this.render_count;\n\n        return true;\n    }\n\n    // Render all active styles, grouped by blend/depth type (opaque, overlay, etc.) and by program (style)\n    // Called both for main render pass, and for secondary passes like selection buffer\n    renderPass(program_key = 'program', { allow_blend } = {}) {\n        // optionally force alpha off (e.g. for selection pass)\n        allow_blend = (allow_blend == null) ? true : allow_blend;\n\n        this.clearFrame({ clear_color: true, clear_depth: true });\n\n        // Sort styles by blend order\n        let styles = this.tile_manager.getActiveStyles().\n            map(s => this.styles[s]).\n            filter(s => s). // guard against missing styles, such as while loading a new scene\n            sort(Style.blendOrderSort);\n\n        // Render styles\n        let count = 0; // how many primitives were rendered\n        let last_blend;\n        for (let s=0; s < styles.length; s++) {\n            let style = styles[s];\n\n            // Only update render state when blend mode changes\n            if (style.blend !== last_blend) {\n                let state = Object.assign({},\n                    Style.render_states[style.blend],       // render state for blend mode\n                    { blend: (allow_blend && style.blend) } // enable/disable blending (e.g. no blend for selection)\n                );\n                this.setRenderState(state);\n            }\n            count += this.renderStyle(style.name, program_key);\n            last_blend = style.blend;\n        }\n\n        return count;\n    }\n\n    renderStyle(style_name, program_key) {\n        let style = this.styles[style_name];\n        let first_for_style = true;\n        let render_count = 0;\n        let program;\n\n        // Render tile GL geometries\n        let renderable_tiles = this.tile_manager.getRenderableTiles();\n        for (let t=0; t < renderable_tiles.length; t++) {\n            let tile = renderable_tiles[t];\n\n            if (tile.meshes[style_name] == null) {\n                continue;\n            }\n\n            // Style-specific state\n            // Only setup style if rendering for first time this frame\n            // (lazy init, not all styles will be used in all screen views; some styles might be defined but never used)\n            if (first_for_style === true) {\n                first_for_style = false;\n                program = this.setupStyle(style, program_key);\n                if (!program) {\n                    return 0;\n                }\n            }\n\n            // Skip proxy tiles if new tiles have finished loading this style\n            if (!tile.shouldProxyForStyle(style_name)) {\n                // log('trace', `Scene.renderStyle(): Skip proxy tile for style '${style_name}' `, tile, tile.proxy_for);\n                continue;\n            }\n\n            // Tile-specific state\n            this.view.setupTile(tile, program);\n\n            // Render tile\n            let mesh = tile.meshes[style_name];\n            if (style.render(mesh)) {\n                // Don't incur additional renders while viewport is moving\n                if (!(this.view.panning || this.view.zooming)) {\n                   this.requestRedraw();\n                }\n            }\n            render_count += mesh.geometry_count;\n        }\n\n        return render_count;\n    }\n\n    setupStyle(style, program_key) {\n        // Get shader program from style, lazily compiling if necessary\n        let program;\n        try {\n            program = style.getProgram(program_key);\n            if (!program) {\n                return;\n            }\n        }\n        catch(error) {\n            this.trigger('warning', {\n                type: 'styles',\n                message: `Error compiling style ${style.name}`,\n                style,\n                shader_errors: style.program && style.program.shader_errors\n            });\n            return;\n        }\n\n        program.use();\n        style.setup();\n\n        program.uniform('1f', 'u_time', this.animated ? (((+new Date()) - this.start_time) / 1000) : 0);\n        this.view.setupProgram(program);\n        for (let i in this.lights) {\n            this.lights[i].setupProgram(program);\n        }\n\n        return program;\n    }\n\n    clearFrame({ clear_color, clear_depth } = {}) {\n        if (!this.initialized) {\n            return;\n        }\n\n        // Defaults\n        clear_color = (clear_color === false) ? false : true; // default true\n        clear_depth = (clear_depth === false) ? false : true; // default true\n\n        // Set GL state\n        this.render_states.depth_write.set({ depth_write: clear_depth });\n\n        let gl = this.gl;\n        if (clear_color || clear_depth) {\n            let mask = (clear_color && gl.COLOR_BUFFER_BIT) | (clear_depth && gl.DEPTH_BUFFER_BIT);\n            gl.clear(mask);\n        }\n    }\n\n    setRenderState({ depth_test, depth_write, cull_face, blend } = {}) {\n        if (!this.initialized) {\n            return;\n        }\n\n        // Defaults\n        // TODO: when we abstract out support for multiple render passes, these can be per-pass config options\n        let render_states = this.render_states;\n        depth_test = (depth_test === false) ? false : render_states.defaults.depth_test;      // default true\n        depth_write = (depth_write === false) ? false : render_states.defaults.depth_write;   // default true\n        cull_face = (cull_face === false) ? false : render_states.defaults.culling;           // default true\n        blend = (blend != null) ? blend : render_states.defaults.blending;                    // default false\n\n        // Reset frame state\n        let gl = this.gl;\n\n        render_states.depth_test.set({ depth_test: depth_test });\n        render_states.depth_write.set({ depth_write: depth_write });\n        render_states.culling.set({ cull: cull_face, face: render_states.defaults.culling_face });\n\n        // Blending of alpha channel is modified to account for WebGL alpha behavior, see:\n        // http://webglfundamentals.org/webgl/lessons/webgl-and-alpha.html\n        // http://stackoverflow.com/a/11533416\n        if (blend) {\n            // Opaque: all source, no destination\n            if (blend === 'opaque') {\n                render_states.blending.set({\n                    blend: false\n                });\n            }\n            // Traditional alpha blending\n            else if (blend === 'overlay' || blend === 'inlay') {\n                render_states.blending.set({\n                    blend: true,\n                    src: gl.SRC_ALPHA, dst: gl.ONE_MINUS_SRC_ALPHA,\n                    src_alpha: gl.ONE, dst_alpha: gl.ONE_MINUS_SRC_ALPHA\n                });\n            }\n            // Additive blending\n            else if (blend === 'add') {\n                render_states.blending.set({\n                    blend: true,\n                    src: gl.ONE, dst: gl.ONE\n                });\n            }\n            // Multiplicative blending\n            else if (blend === 'multiply') {\n                render_states.blending.set({\n                    blend: true,\n                    src: gl.ZERO, dst: gl.SRC_COLOR\n                });\n            }\n        }\n        else {\n            render_states.blending.set({ blend: false });\n        }\n    }\n\n    // Request feature selection at given pixel. Runs async and returns results via a promise.\n    getFeatureAt(pixel) {\n        if (!this.initialized) {\n            log('debug', \"Scene.getFeatureAt() called before scene was initialized\");\n            return Promise.resolve();\n        }\n\n        // Point scaled to [0..1] range\n        var point = {\n            x: pixel.x * Utils.device_pixel_ratio / this.view.size.device.width,\n            y: pixel.y * Utils.device_pixel_ratio / this.view.size.device.height\n        };\n\n        return this.selection.getFeatureAt(point).\n            then(selection => Object.assign(selection, { pixel })).\n            catch(error => Promise.resolve({ error }));\n    }\n\n    // Rebuild all tiles, without re-parsing the config or re-compiling styles\n    // sync: boolean of whether to sync the config object to the worker\n    // sources: optional array of data sources to selectively rebuild (by default all our rebuilt)\n    rebuild({ sync = true, sources = null, serialize_funcs, profile = false, fade_in = false } = {}) {\n        return new Promise((resolve, reject) => {\n            // Skip rebuild if already in progress\n            if (this.building) {\n                // Queue up to one rebuild call at a time, only save last request\n                if (this.building.queued && this.building.queued.reject) {\n                    // notify previous request that it did not complete\n                    log('debug', 'Scene.rebuild: request superceded by a newer call');\n                    this.building.queued.resolve(false); // false flag indicates rebuild request was superceded\n                }\n\n                // Save queued request\n                let options = { sync, sources, serialize_funcs, profile, fade_in };\n                this.building.queued = { resolve, reject, options };\n                log('trace', `Scene.rebuild(): queuing request`);\n                return;\n            }\n\n            // Track tile build state\n            this.building = { resolve, reject };\n\n            // Profiling\n            if (profile) {\n                this._profile('Scene.rebuild');\n            }\n\n            // Update config (in case JS objects were manipulated directly)\n            if (sync) {\n                this.syncConfigToWorker({ serialize_funcs });\n            }\n            this.resetFeatureSelection();\n            this.resetTime();\n\n            // Rebuild visible tiles\n            this.tile_manager.pruneToVisibleTiles();\n            this.tile_manager.forEachTile(tile => {\n                if (!sources || sources.indexOf(tile.source.name) > -1) {\n                    this.tile_manager.buildTile(tile, { fade_in });\n                }\n            });\n            this.tile_manager.updateTilesForView(); // picks up additional tiles for any new/changed data sources\n            this.tile_manager.checkBuildQueue();    // resolve immediately if no tiles to build\n        }).then(() => {\n            // Profiling\n            if (profile) {\n                this._profileEnd('Scene.rebuild');\n            }\n        });\n    }\n\n    // Tile manager finished building tiles\n    // TODO move to tile manager\n    tileManagerBuildDone() {\n        if (this.building) {\n            log('info', `Scene: build geometry finished`);\n            if (this.building.resolve) {\n                this.building.resolve(true);\n            }\n\n            // Another rebuild queued?\n            var queued = this.building.queued;\n            this.building = null;\n            if (queued) {\n                log('debug', `Scene: starting queued rebuild() request`);\n                this.rebuild(queued.options).then(queued.resolve, queued.reject);\n            }\n        }\n    }\n\n    /**\n       Load (or reload) the scene config\n       @return {Promise}\n    */\n    loadScene(config_source = null, config_path = null) {\n        this.config_source = config_source || this.config_source;\n        this.config_globals_applied = [];\n\n        if (typeof this.config_source === 'string') {\n            this.config_path = URLs.pathForURL(config_path || this.config_source);\n        }\n        else {\n            this.config_path = URLs.pathForURL(config_path);\n        }\n\n        return SceneLoader.loadScene(this.config_source, this.config_path).then(({config, bundle}) => {\n            this.config = config;\n            this.config_bundle = bundle;\n            return this.config;\n        });\n    }\n\n    // Add source to a scene, arguments `name` and `config` need to be provided:\n    //  - If the name doesn't match a sources it will create it\n    //  - the `config` obj follow the YAML scene spec, ex: ```{type: 'TopoJSON', url: \"//tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.topojson\"]}```\n    //    that looks like:\n    //\n    //      scene.setDataSource(\"osm\", {type: 'TopoJSON', url: \"//tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.topojson\" });\n    //\n    //  - also can be pass a ```data``` obj: ```{type: 'GeoJSON', data: JSObj ]}```\n    //\n    //      var geojson_data = {};\n    //      ...\n    //      scene.setDataSource(\"dynamic_data\", {type: 'GeoJSON', data: geojson_data });\n    //\n    setDataSource (name, config) {\n        if (!name || !config || !config.type || (!config.url && !config.data)) {\n            log('error', \"No name provided or not a valid config:\", name, config);\n            return;\n        }\n\n        let load = (this.config.sources[name] == null);\n        let source = this.config.sources[name] = Object.assign({}, config);\n\n        // Convert raw data into blob URL\n        if (source.data && typeof source.data === 'object') {\n            source.url = URLs.createObjectURL(new Blob([JSON.stringify(source.data)]));\n            delete source.data;\n        }\n\n        // Resolve paths relative to root scene bundle\n        SceneLoader.normalizeDataSource(source, this.config_bundle);\n\n        if (load) {\n            return this.updateConfig({ rebuild: { sources: [name] } });\n        } else {\n            return this.rebuild({ sources: [name] });\n        }\n    }\n\n    createDataSources() {\n        let reset = []; // sources to reset\n        let prev_source_names = Object.keys(this.sources);\n        let source_id = 0;\n\n        for (var name in this.config.sources) {\n            let source = this.config.sources[name];\n            let prev_source = this.sources[name];\n\n            try {\n                let config = Object.assign({}, source, { name, id: source_id++ });\n                this.sources[name] = DataSource.create(config, this.sources);\n                if (!this.sources[name]) {\n                    throw {};\n                }\n            }\n            catch(e) {\n                delete this.sources[name];\n                let message = `Could not create data source: ${e.message}`;\n                log('warn', `Scene: ${message}`, source);\n                this.trigger('warning', { type: 'sources', source, message });\n            }\n\n            // Data source changed?\n            if (DataSource.changed(this.sources[name], prev_source)) {\n                reset.push(name);\n            }\n        }\n\n        // Sources that were removed\n        prev_source_names.forEach(s => {\n            if (!this.config.sources[s]) {\n                delete this.sources[s]; // TODO: remove from workers too?\n                reset.push(s);\n            }\n        });\n\n        // Remove tiles from sources that have changed\n        if (reset.length > 0) {\n            this.tile_manager.removeTiles(tile => {\n                return (reset.indexOf(tile.source.name) > -1);\n            });\n        }\n\n        // Mark sources that will generate geometry tiles\n        // (all except those that are only raster sources attached to other sources)\n        for (let ln in this.config.layers) {\n            let layer = this.config.layers[ln];\n            if (layer.data && this.sources[layer.data.source]) {\n                this.sources[layer.data.source].builds_geometry_tiles = true;\n            }\n        }\n    }\n\n    // Load all textures in the scene definition\n    loadTextures() {\n        return Texture.createFromObject(this.gl, this.config.textures).\n            then(() => Texture.createDefault(this.gl)); // create a 'default' texture for placeholders\n    }\n\n    // Called (currently manually) after styles are updated in stylesheet\n    updateStyles() {\n        if (!this.initialized && !this.initializing) {\n            throw new Error('Scene.updateStyles() called before scene was initialized');\n        }\n\n        // (Re)build styles from config\n        this.styles = this.style_manager.build(this.config.styles);\n        this.style_manager.initStyles(this);\n\n        // Optionally set GL context (used when initializing or re-initializing GL resources)\n        for (let style in this.styles) {\n            this.styles[style].setGL(this.gl);\n        }\n\n        // Use explicitly set scene animation flag if defined, otherwise turn on animation if there are any animated styles\n        this.animated =\n            this.config.scene.animated !== undefined ?\n                this.config.scene.animated :\n                Object.keys(this.styles).some(s => this.styles[s].animated);\n\n        this.dirty = true;\n    }\n\n    // Get active camera - for public API\n    getActiveCamera() {\n        return this.view.getActiveCamera();\n    }\n\n    // Set active camera - for public API\n    setActiveCamera(name) {\n        return this.view.setActiveCamera(name);\n    }\n\n    // Create lighting\n    createLights() {\n        this.lights = {};\n        for (let i in this.config.lights) {\n            if (!this.config.lights[i] || typeof this.config.lights[i] !== 'object') {\n                continue;\n            }\n            let light = this.config.lights[i];\n            light.name = i.replace('-', '_'); // light names are injected in shaders, can't have hyphens\n            light.visible = (light.visible === false) ? false : true;\n            if (light.visible) {\n                this.lights[light.name] = Light.create(this.view, light);\n            }\n        }\n        Light.inject(this.lights);\n    }\n\n    // Set background color\n    setBackground() {\n        let bg = this.config.scene.background;\n        this.background = {};\n        if (bg && bg.color) {\n            this.background.color = StyleParser.parseColor(bg.color);\n        }\n        if (!this.background.color) {\n            this.background.color = [0, 0, 0, 0]; // default background TODO: vary w/scene alpha\n        }\n\n        // if background is fully opaque, set canvas background to match\n        if (this.background.color[3] === 1) {\n            this.canvas.style.backgroundColor =\n                `rgba(${this.background.color.map(c => Math.floor(c * 255)).join(', ')})`;\n        }\n        else {\n            this.canvas.style.backgroundColor = 'transparent';\n        }\n\n        this.gl.clearColor(...this.background.color);\n    }\n\n    // Turn introspection mode on/off\n    setIntrospection (val) {\n        this.introspection = val || false;\n        this.updating++;\n        return this.updateConfig().then(() => this.updating--);\n    }\n\n    // Update scene config, and optionally rebuild geometry\n    // rebuild can be boolean, or an object containing rebuild options to passthrough\n    updateConfig({ load_event = false, rebuild = true, serialize_funcs, fade_in = false } = {}) {\n        this.generation = ++Scene.generation;\n        this.updating++;\n\n        this.config = SceneLoader.applyGlobalProperties(this.config, this.config_globals_applied);\n        this.trigger(load_event ? 'load' : 'update', { config: this.config });\n\n        SceneLoader.hoistTextures(this.config); // move inline textures into global texture set\n        this.style_manager.init();\n        this.view.reset();\n        this.createLights();\n        this.createDataSources();\n        this.loadTextures();\n        this.setBackground();\n        FontManager.loadFonts(this.config.fonts);\n\n        // TODO: detect changes to styles? already (currently) need to recompile anyway when camera or lights change\n        this.updateStyles();\n\n        // Optionally rebuild geometry\n        let done = rebuild ?\n            this.rebuild(Object.assign({ serialize_funcs, fade_in }, typeof rebuild === 'object' && rebuild)) :\n            this.syncConfigToWorker({ serialize_funcs }); // rebuild() also syncs config\n\n        // Finish by updating bounds and re-rendering\n        this.updating--;\n        this.view.updateBounds();\n        this.requestRedraw();\n\n        return done;\n    }\n\n    // Serialize config and send to worker\n    syncConfigToWorker({ serialize_funcs = true } = {}) {\n        // Tell workers we're about to rebuild (so they can update styles, etc.)\n        let config_serialized =\n            serialize_funcs ? Utils.serializeWithFunctions(this.config) : JSON.stringify(this.config);\n        return WorkerBroker.postMessage(this.workers, 'self.updateConfig', {\n            config: config_serialized,\n            generation: this.generation,\n            introspection: this.introspection\n        });\n    }\n\n    // Listen to related objects\n    createListeners () {\n        this.listeners = {};\n\n        this.listeners.view = {\n            move: () => this.trigger('move')\n        };\n        this.view.subscribe(this.listeners.view);\n\n        this.listeners.texture = {\n            update: () => this.dirty = true,\n            warning: (data) => this.trigger('warning', Object.assign({ type: 'textures' }, data))\n        };\n        Texture.subscribe(this.listeners.texture);\n\n        this.listeners.scene_loader = {\n            error: (data) => this.trigger('error', Object.assign({ type: 'scene' }, data))\n        };\n        SceneLoader.subscribe(this.listeners.scene_loader);\n    }\n\n    destroyListeners () {\n        this.unsubscribeAll();\n        this.view.unsubscribe(this.listeners.view);\n        Texture.unsubscribe(this.listeners.texture);\n        SceneLoader.unsubscribe(this.listeners.scene_loader);\n        this.listeners = null;\n    }\n\n    resetFeatureSelection() {\n        if (!this.selection) {\n            this.selection = new FeatureSelection(this.gl, this.workers, () => this.building);\n        }\n        else if (this.workers) {\n            WorkerBroker.postMessage(this.workers, 'self.resetFeatureSelection');\n        }\n    }\n\n    // Gets the current feature selection map size across all workers. Returns a promise.\n    getFeatureSelectionMapSize() {\n        if (this.fetching_selection_map) {\n            return Promise.resolve(); // return undefined if already pending\n        }\n        this.fetching_selection_map = true;\n\n        return WorkerBroker.postMessage(this.workers, 'self.getFeatureSelectionMapSize')\n            .then(sizes => {\n                this.fetching_selection_map = false;\n                return sizes.reduce((a, b) => a + b);\n            });\n    }\n\n    // Reset internal clock, mostly useful for consistent experience when changing styles/debugging\n    resetTime() {\n        this.start_time = +new Date();\n    }\n\n    // Fires event when rendered tile set or style changes\n    updateViewComplete () {\n        if ((this.render_count_changed || this.generation !== this.last_complete_generation) &&\n            !this.tile_manager.isLoadingVisibleTiles()) {\n            this.last_complete_generation = this.generation;\n            this.trigger('view_complete');\n        }\n    }\n\n    resetViewComplete () {\n        this.last_complete_generation = null;\n    }\n\n    // Take a screenshot\n    // Asynchronous because we have to wait for next render to capture buffer\n    // Returns a promise\n    screenshot () {\n        this.requestRedraw();\n        return this.media_capture.screenshot();\n    }\n\n    startVideoCapture () {\n        this.requestRedraw();\n        return this.media_capture.startVideoCapture();\n    }\n\n    stopVideoCapture () {\n        return this.media_capture.stopVideoCapture();\n    }\n\n\n    // Stats/debug/profiling methods\n\n    // Profile helpers, issues a profile on main thread & all workers\n    _profile(name) {\n        console.profile(`main thread: ${name}`);\n        WorkerBroker.postMessage(this.workers, 'self.profile', name);\n    }\n\n    _profileEnd(name) {\n        console.profileEnd(`main thread: ${name}`);\n        WorkerBroker.postMessage(this.workers, 'self.profileEnd', name);\n    }\n\n    // Debug config and functions\n    setupDebug () {\n        let scene = this;\n        this.debug = {\n            // Rebuild geometry a given # of times and print average, min, max timings\n            timeRebuild (num = 1, options = {}) {\n                let times = [];\n                let cycle = () => {\n                    let start = +new Date();\n                    scene.rebuild(options).then(() => {\n                        times.push(+new Date() - start);\n\n                        if (times.length < num) {\n                            cycle();\n                        }\n                        else {\n                            let avg = ~~(times.reduce((a, b) => a + b) / times.length);\n                            log('info', `Profiled rebuild ${num} times: ${avg} avg (${Math.min(...times)} min, ${Math.max(...times)} max)`);\n                        }\n                    });\n                };\n                cycle();\n            },\n\n            // Return geometry counts of visible tiles, grouped by style name\n            geometryCountByStyle () {\n                let counts = {};\n                scene.tile_manager.getRenderableTiles().forEach(tile => {\n                    for (let style in tile.meshes) {\n                        counts[style] = counts[style] || 0;\n                        counts[style] += tile.meshes[style].geometry_count;\n                    }\n                });\n                return counts;\n            },\n\n            geometryCountByBaseStyle () {\n                let style_counts = scene.debug.geometryCountByStyle();\n                let counts = {};\n                for (let style in style_counts) {\n                    let base = scene.styles[style].baseStyle();\n                    counts[base] = counts[base] || 0;\n                    counts[base] += style_counts[style];\n                }\n                return counts;\n            },\n\n            renderableTilesCount () {\n                return scene.tile_manager.getRenderableTiles().length;\n            }\n        };\n    }\n\n}\n\nScene.id = 0;         // unique id for a scene instance\nScene.generation = 0; // id that is incremented each time a scene config is re-parsed\n",
+    "/*jshint worker: true*/\n\nimport './utils/polyfills';\n\n// The leaflet layer plugin is currently the primary public API\nimport {leafletLayer} from './leaflet_layer';\n\n// The scene worker is only activated when a worker thread is instantiated, but must always be loaded\nimport Scene from './scene';\nimport {SceneWorker} from './scene_worker';\n\n// Additional modules are exposed for debugging\nimport version from './utils/version';\nimport log from './utils/log';\nimport Thread from './utils/thread';\nimport Utils from './utils/utils';\nimport Geo from './geo';\nimport Vector from './vector';\nimport DataSource from './sources/data_source';\nimport './sources/geojson';\nimport './sources/topojson';\nimport './sources/mvt';\nimport './sources/raster';\nimport GLSL from './gl/glsl';\nimport ShaderProgram from './gl/shader_program';\nimport VertexData from './gl/vertex_data';\nimport Texture from './gl/texture';\nimport Material from './material';\nimport Light from './light';\nimport WorkerBroker from './utils/worker_broker';\nimport {layerCache} from './styles/layer';\nimport {StyleManager} from './styles/style_manager';\nimport {StyleParser} from './styles/style_parser';\nimport Collision from './labels/collision';\nimport FeatureSelection from './selection';\nimport CanvasText from './styles/text/canvas_text';\nimport debugSettings from './utils/debug_settings';\n\nimport yaml from 'js-yaml';\nimport JSZip from 'jszip';\n\n// Make some modules accessible for debugging\nvar debug = {\n    log,\n    yaml,\n    Thread,\n    Utils,\n    Geo,\n    Vector,\n    DataSource,\n    GLSL,\n    ShaderProgram,\n    VertexData,\n    Texture,\n    Material,\n    Light,\n    Scene,\n    SceneWorker,\n    WorkerBroker,\n    layerCache,\n    StyleManager,\n    StyleParser,\n    Collision,\n    FeatureSelection,\n    CanvasText,\n    debugSettings\n};\n\nif (Thread.is_main) {\n    Utils.requestAnimationFramePolyfill();\n\n    // Attach Promise polyfill to window\n    // Allows FontFaceObserver to use polyfill (without needing to include its own duplicate polyfill)\n    if (window.Promise === undefined) {\n        window.Promise = Promise;\n        JSZip.external.Promise = Promise;\n    }\n}\n\nmodule.exports = {\n    leafletLayer,\n    debug,\n    version\n};\n",
+    "import log from './utils/log';\nimport Utils from './utils/utils';\nimport * as URLs from './utils/urls';\nimport WorkerBroker from './utils/worker_broker';\nimport subscribeMixin from './utils/subscribe';\nimport Context from './gl/context';\nimport Texture from './gl/texture';\nimport ShaderProgram from './gl/shader_program';\nimport VertexArrayObject from './gl/vao';\nimport {StyleManager} from './styles/style_manager';\nimport {Style} from './styles/style';\nimport {StyleParser} from './styles/style_parser';\nimport SceneLoader from './scene_loader';\nimport View from './view';\nimport Light from './light';\nimport TileManager from './tile_manager';\nimport DataSource from './sources/data_source';\nimport FeatureSelection from './selection';\nimport RenderStateManager from './gl/render_state';\nimport CanvasText from './styles/text/canvas_text';\nimport FontManager from './styles/text/font_manager';\nimport MediaCapture from './utils/media_capture';\n\n// Load scene definition: pass an object directly, or a URL as string to load remotely\nexport default class Scene {\n\n    constructor(config_source, options) {\n        options = options || {};\n        subscribeMixin(this);\n\n        this.id = Scene.id++;\n        this.initialized = false;\n        this.initializing = null; // will be a promise that resolves when scene is loaded\n        this.sources = {};\n\n        this.view = new View(this, options);\n        this.tile_manager = new TileManager({ scene: this, view: this.view });\n        this.num_workers = options.numWorkers || 2;\n        if (options.disableVertexArrayObjects === true) {\n            VertexArrayObject.disabled = true;\n        }\n\n        Utils.use_high_density_display = options.highDensityDisplay !== undefined ? options.highDensityDisplay : true;\n        Utils.updateDevicePixelRatio();\n\n        this.config = null;\n        this.config_source = config_source;\n        this.config_bundle = null;\n        this.last_valid_config_source = null;\n\n        this.styles = null;\n        this.style_manager = new StyleManager();\n\n        this.building = null;                           // tracks current scene building state (tiles being built, etc.)\n        this.dirty = true;                              // request a redraw\n        this.animated = false;                          // request redraw every frame\n        this.preUpdate = options.preUpdate;             // optional pre-render loop hook\n        this.postUpdate = options.postUpdate;           // optional post-render loop hook\n        this.render_loop = !options.disableRenderLoop;  // disable render loop - app will have to manually call Scene.render() per frame\n        this.render_loop_active = false;\n        this.render_loop_stop = false;\n        this.render_count = 0;\n        this.last_render_count = 0;\n        this.render_count_changed = false;\n        this.frame = 0;\n        this.last_main_render = -1;         // frame counter for last main render pass\n        this.last_selection_render = -1;    // frame counter for last selection render pass\n        this.media_capture = new MediaCapture();\n        this.selection = null;\n        this.introspection = false;\n        this.resetTime();\n\n        this.container = options.container;\n        this.canvas = null;\n        this.contextOptions = options.webGLContextOptions;\n\n        this.lights = null;\n        this.background = null;\n\n        this.createListeners();\n        this.updating = 0;\n        this.generation = Scene.generation; // an id that is incremented each time the scene config is invalidated\n        this.last_complete_generation = Scene.generation; // last generation id with a complete view\n        this.setupDebug();\n\n        this.log_level = options.logLevel || 'warn';\n        log.setLevel(this.log_level);\n        log.reset();\n    }\n\n    static create (config, options = {}) {\n        return new Scene(config, options);\n    }\n\n    // Load scene (or reload existing scene if no new source specified)\n    // Options:\n    //   `config_path`: base URL against which roo scene resources should be resolved (useful for Play) (default nulll)\n    //   `blocking`: should rendering block on scene load completion (default true)\n    load(config_source = null, options = {}) {\n        if (this.initializing) {\n            return this.initializing;\n        }\n        log.reset();\n\n        this.updating++;\n        this.initialized = false;\n\n        // Backwards compatibilty for passing `config_path` string as second argument\n        // (since transitioned to using options argument to accept more parameters)\n        options = (typeof options === 'string') ? { config_path: options } : options;\n        let config_path = options.config_path;\n\n        // Should rendering block on load (not desirable for initial load, often desired for live style-switching)\n        options.blocking = (options.blocking !== undefined) ? options.blocking : true;\n\n        // Load scene definition (sources, styles, etc.), then create styles & workers\n        this.createCanvas();\n        this.initializing = this.loadScene(config_source, config_path)\n            .then(() => this.createWorkers())\n            .then(() => {\n                this.resetFeatureSelection();\n\n                // Scene loaded from a JS object, or modified by a `load` event, may contain compiled JS functions\n                // which need to be serialized, while one loaded only from a URL does not.\n                const serialize_funcs = ((typeof this.config_source === 'object') || this.hasSubscribersFor('load'));\n\n                const updating = this.updateConfig({ serialize_funcs, load_event: true, fade_in: true });\n                if (options.blocking === true) {\n                    return updating;\n                }\n            }).then(() => {\n                this.updating--;\n                this.initializing = null;\n                this.initialized = true;\n                this.last_valid_config_source = this.config_source;\n                this.last_valid_config_path = this.config_path;\n\n                if (this.render_loop !== false) {\n                    this.setupRenderLoop();\n                }\n                this.requestRedraw();\n        }).catch(error => {\n            this.initializing = null;\n            this.updating = 0;\n\n            // Report and revert to last valid config if available\n            let type, message;\n            if (error.name === 'YAMLException') {\n                type = 'yaml';\n                message = 'Error parsing scene YAML';\n            }\n            else {\n                // TODO: more error types\n                message = 'Error initializing scene';\n            }\n            this.trigger('error', { type, message, error, url: this.config_source });\n\n            message = `Scene.load() failed to load ${this.config_source}: ${error.message}`;\n            if (this.last_valid_config_source) {\n                log('warn', message, error);\n                log('info', `Scene.load() reverting to last valid configuration`);\n                return this.load(this.last_valid_config_source, this.last_valid_config_path);\n            }\n            log('error', message, error);\n            throw error;\n        });\n\n        return this.initializing;\n    }\n\n    destroy() {\n        this.initialized = false;\n        this.render_loop_stop = true; // schedule render loop to stop\n\n        this.destroyListeners();\n\n        if (this.canvas && this.canvas.parentNode) {\n            this.canvas.parentNode.removeChild(this.canvas);\n            this.canvas = null;\n        }\n        this.container = null;\n\n        if (this.selection) {\n            this.selection.destroy();\n        }\n\n        if (this.gl) {\n            Texture.destroy(this.gl);\n            this.style_manager.destroy(this.gl);\n            this.styles = {};\n\n            ShaderProgram.reset();\n\n            // Force context loss\n            let ext = this.gl.getExtension('WEBGL_lose_context');\n            if (ext) {\n                ext.loseContext();\n            }\n\n            this.gl = null;\n        }\n\n        this.sources = {};\n\n        this.destroyWorkers();\n        this.tile_manager.destroy();\n        this.tile_manager = null;\n        log.reset();\n    }\n\n    createCanvas() {\n        if (this.canvas) {\n            return;\n        }\n\n        this.container = this.container || document.body;\n        this.canvas = document.createElement('canvas');\n        this.canvas.style.position = 'absolute';\n        this.canvas.style.top = 0;\n        this.canvas.style.left = 0;\n\n        // Force tangram canvas underneath all leaflet layers, and set background to transparent\n        this.container.style.backgroundColor = 'transparent';\n        this.container.appendChild(this.canvas);\n\n        try {\n            this.gl = Context.getContext(this.canvas, Object.assign({\n                alpha: true, premultipliedAlpha: true,\n                device_pixel_ratio: Utils.device_pixel_ratio\n            }, this.contextOptions));\n        }\n        catch(e) {\n            throw new Error(\n                \"Couldn't create WebGL context. \" +\n                \"Your browser may not support WebGL, or it's turned off? \" +\n                \"Visit http://webglreport.com/ for more info.\"\n            );\n        }\n\n        this.resizeMap(this.container.clientWidth, this.container.clientHeight);\n        VertexArrayObject.init(this.gl);\n        this.render_states = new RenderStateManager(this.gl);\n        this.media_capture.setCanvas(this.canvas);\n    }\n\n    // Get the URL to load the web worker from\n    getWorkerUrl() {\n        let worker_url;\n        /* jshint -W117 */\n        // ignore uninitialized worker src variable (defined in parent scope)\n        if (typeof __worker_src__ !== \"undefined\"){\n            let source = '(' + __worker_src__ + ')()';\n            if (__worker_src_origin__) {\n                let origin = __worker_src_origin__.slice(0, __worker_src_origin__.lastIndexOf('/')+1);\n                source += '\\n//#' + ' sourceMappingURL=' + origin + __worker_src_map__;\n            }\n            worker_url = URLs.createObjectURL(new Blob([source], { type: 'application/javascript' }));\n        }\n        /* jshint +W117 */\n\n        if (!worker_url) {\n            throw new Error(\"Couldn't find internal Tangram source variable (may indicate the library did not build correctly)\");\n        }\n\n        // Import custom data source scripts alongside core library\n        // NOTE: workaround for issue where large libraries intermittently fail to load in web workers,\n        // when multiple importScripts() calls are used. Loading all scripts (including Tangram itself)\n        // in one call at at worker creation time has not exhibited the same issue.\n        let urls = [...this.data_source_scripts];\n        urls.push(worker_url); // load Tangram *last* (has been more reliable, though reason unknown)\n        let body = `importScripts(${urls.map(url => `'${url}'`).join(',')});`;\n        return URLs.createObjectURL(new Blob([body], { type: 'application/javascript' }));\n    }\n\n    // Update list of any custom data source scripts (if any)\n    updateDataSourceScripts () {\n        let prev_scripts = [...(this.data_source_scripts||[])]; // save list of previously loaded scripts\n        let scripts = Object.keys(this.config.sources).map(s => this.config.sources[s].scripts).filter(x => x);\n        if (scripts.length > 0) {\n            log('debug', 'loading custom data source scripts in worker:', scripts);\n        }\n        this.data_source_scripts = [].concat(...scripts).sort();\n\n        // Scripts changed?\n        return !(this.data_source_scripts.length === prev_scripts.length &&\n            this.data_source_scripts.every((v, i) => v === prev_scripts[i]));\n    }\n\n    // Web workers handle heavy duty tile construction: networking, geometry processing, etc.\n    createWorkers() {\n        // Reset old workers (if any) if we need to re-instantiate with new external scripts\n        if (this.updateDataSourceScripts()) {\n            this.destroyWorkers();\n        }\n\n        if (!this.workers) {\n            return this.makeWorkers(this.getWorkerUrl());\n        }\n        return Promise.resolve();\n    }\n\n    // Instantiate workers from URL, init event handlers\n    makeWorkers(url) {\n        var queue = [];\n\n        this.workers = [];\n        for (var id=0; id < this.num_workers; id++) {\n            var worker = new Worker(url);\n            this.workers[id] = worker;\n\n            WorkerBroker.addWorker(worker);\n\n            log('debug', `Scene.makeWorkers: initializing worker ${id}`);\n            let _id = id;\n            queue.push(WorkerBroker.postMessage(worker, 'self.init', this.id, id, this.num_workers, this.log_level, Utils.device_pixel_ratio).then(\n                (id) => {\n                    log('debug', `Scene.makeWorkers: initialized worker ${id}`);\n                    return id;\n                },\n                (error) => {\n                    log('error', `Scene.makeWorkers: failed to initialize worker ${_id}:`, error);\n                    return Promise.reject(error);\n                })\n            );\n        }\n\n        this.next_worker = 0;\n        return Promise.all(queue).then(() => {\n            log.setWorkers(this.workers);\n\n            // Let VertexElements know if 32 bit indices for element arrays are available\n            let Uint32_flag = this.gl.getExtension(\"OES_element_index_uint\") ? true : false;\n            WorkerBroker.postMessage(this.workers, 'VertexElements.setUint32Flag', Uint32_flag);\n\n            // Free memory after worker initialization\n            URLs.revokeObjectURL(url);\n        });\n    }\n\n    destroyWorkers() {\n        if (Array.isArray(this.workers)) {\n            log.setWorkers(null);\n            this.workers.forEach((worker) => {\n                worker.terminate();\n            });\n            this.workers = null;\n        }\n    }\n\n    // Assign tile to worker thread based on data source\n    getWorkerForDataSource(source) {\n        let worker;\n\n        if (source.tiled) {\n            // Round robin tiled sources across all workers\n            worker = this.workers[this.next_worker];\n            this.next_worker = (this.next_worker + 1) % this.workers.length;\n        }\n        else {\n            // Pin all tiles from each non-tiled source to a single worker\n            // Prevents data for these sources from being loaded more than once\n            worker = this.workers[source.id % this.workers.length];\n        }\n\n        return worker;\n    }\n\n    // Scene is ready for rendering\n    ready() {\n        if (!this.view.ready() || Object.keys(this.sources).length === 0) {\n             return false;\n        }\n        return true;\n    }\n\n    // Resize the map when device pixel ratio changes, e.g. when switching between displays\n    updateDevicePixelRatio () {\n        if (Utils.updateDevicePixelRatio()) {\n            WorkerBroker.postMessage(this.workers, 'self.updateDevicePixelRatio', Utils.device_pixel_ratio)\n                .then(() => this.rebuild())\n                .then(() => this.resizeMap(this.view.size.css.width, this.view.size.css.height));\n        }\n    }\n\n    resizeMap(width, height) {\n        if (width === 0 && height === 0) {\n            return;\n        }\n\n        this.dirty = true;\n        this.view.setViewportSize(width, height);\n        if (this.gl) {\n            Context.resize(this.gl, width, height, Utils.device_pixel_ratio);\n        }\n    }\n\n    // Request scene be redrawn at next animation loop\n    requestRedraw() {\n        this.dirty = true;\n    }\n\n    // Redraw scene immediately - don't wait for animation loop\n    // Use sparingly, but for cases where you need the closest possible sync with other UI elements,\n    // such as other, non-WebGL map layers (e.g. Leaflet raster layers, markers, etc.)\n    immediateRedraw() {\n        this.dirty = true;\n        this.update();\n    }\n\n    renderLoop () {\n        this.render_loop_active = true; // only let the render loop instantiate once\n\n        if (this.initialized) {\n            // Render the scene\n            this.update();\n        }\n\n        // Request the next frame if not scheduled to stop\n        if (!this.render_loop_stop) {\n            window.requestAnimationFrame(this.renderLoop.bind(this));\n        }\n        else {\n            this.render_loop_stop = false;\n            this.render_loop_active = false;\n        }\n    }\n\n    // Setup the render loop\n    setupRenderLoop() {\n        if (!this.render_loop_active) {\n            setTimeout(() => { this.renderLoop(); }, 0); // delay start by one tick\n        }\n    }\n\n    update() {\n        // Determine which passes (if any) to render\n        let main = this.dirty;\n        let selection = this.selection ? this.selection.hasPendingRequests() : false;\n        var will_render = !(\n            (main === false && selection === false) ||\n            this.initialized === false ||\n            this.updating > 0 ||\n            this.ready() === false\n        );\n\n        // Pre-render loop hook\n        if (typeof this.preUpdate === 'function') {\n            this.preUpdate(will_render);\n        }\n\n        // Bail if no need to render\n        if (!will_render) {\n            return false;\n        }\n        this.dirty = false; // subclasses can set this back to true when animation is needed\n\n        // Render the scene\n        this.updateDevicePixelRatio();\n        this.render({ main, selection });\n        this.updateViewComplete(); // fires event when rendered tile set or style changes\n        this.media_capture.completeScreenshot(); // completes screenshot capture if requested\n\n        // Post-render loop hook\n        if (typeof this.postUpdate === 'function') {\n            this.postUpdate(will_render);\n        }\n\n        // Redraw every frame if animating\n        if (this.animated === true || this.view.isAnimating()) {\n            this.dirty = true;\n        }\n\n        this.frame++;\n        log('trace', 'Scene.render()');\n        return true;\n    }\n\n    // Accepts flags indicating which render passes should be made\n    render({ main, selection }) {\n        var gl = this.gl;\n\n        // Update styles, camera, lights\n        this.view.update();\n        Object.keys(this.lights).forEach(i => this.lights[i].update());\n\n        // Render main pass\n        if (main) {\n            this.render_count = this.renderPass();\n            this.last_main_render = this.frame;\n        }\n\n        // Render selection pass (if needed)\n        if (selection) {\n            if (this.view.panning || this.view.zooming) {\n                this.selection.clearPendingRequests();\n                return;\n            }\n\n            // Only re-render if selection buffer is out of date (relative to main render buffer)\n            // and not locked (e.g. no tiles are actively building)\n            if (!this.selection.locked && this.last_selection_render < this.last_main_render) {\n                this.selection.bind();          // switch to FBO\n                this.renderPass(\n                    'selection_program',        // render w/alternate program\n                    { allow_blend: false });\n\n                // Reset to screen buffer\n                gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n                gl.viewport(0, 0, this.canvas.width, this.canvas.height);\n                this.last_selection_render = this.frame;\n            }\n\n            this.selection.read(); // process any pending results from selection buffer\n        }\n\n        this.render_count_changed = false;\n        if (this.render_count !== this.last_render_count) {\n            this.render_count_changed = true;\n\n            this.getFeatureSelectionMapSize().then(size => {\n                if (size) { // returns undefined if previous request pending\n                    log('info', `Scene: rendered ${this.render_count} primitives (${size} features in selection map)`);\n                }\n            });\n        }\n        this.last_render_count = this.render_count;\n\n        return true;\n    }\n\n    // Render all active styles, grouped by blend/depth type (opaque, overlay, etc.) and by program (style)\n    // Called both for main render pass, and for secondary passes like selection buffer\n    renderPass(program_key = 'program', { allow_blend } = {}) {\n        // optionally force alpha off (e.g. for selection pass)\n        allow_blend = (allow_blend == null) ? true : allow_blend;\n\n        this.clearFrame({ clear_color: true, clear_depth: true });\n\n        // Sort styles by blend order\n        let styles = this.tile_manager.getActiveStyles().\n            map(s => this.styles[s]).\n            filter(s => s). // guard against missing styles, such as while loading a new scene\n            sort(Style.blendOrderSort);\n\n        // Render styles\n        let count = 0; // how many primitives were rendered\n        let last_blend;\n        for (let s=0; s < styles.length; s++) {\n            let style = styles[s];\n\n            // Only update render state when blend mode changes\n            if (style.blend !== last_blend) {\n                let state = Object.assign({},\n                    Style.render_states[style.blend],       // render state for blend mode\n                    { blend: (allow_blend && style.blend) } // enable/disable blending (e.g. no blend for selection)\n                );\n                this.setRenderState(state);\n            }\n            count += this.renderStyle(style.name, program_key);\n            last_blend = style.blend;\n        }\n\n        return count;\n    }\n\n    renderStyle(style_name, program_key) {\n        let style = this.styles[style_name];\n        let first_for_style = true;\n        let render_count = 0;\n        let program;\n\n        // Render tile GL geometries\n        let renderable_tiles = this.tile_manager.getRenderableTiles();\n        for (let t=0; t < renderable_tiles.length; t++) {\n            let tile = renderable_tiles[t];\n\n            if (tile.meshes[style_name] == null) {\n                continue;\n            }\n\n            // Style-specific state\n            // Only setup style if rendering for first time this frame\n            // (lazy init, not all styles will be used in all screen views; some styles might be defined but never used)\n            if (first_for_style === true) {\n                first_for_style = false;\n                program = this.setupStyle(style, program_key);\n                if (!program) {\n                    return 0;\n                }\n            }\n\n            // Skip proxy tiles if new tiles have finished loading this style\n            if (!tile.shouldProxyForStyle(style_name)) {\n                // log('trace', `Scene.renderStyle(): Skip proxy tile for style '${style_name}' `, tile, tile.proxy_for);\n                continue;\n            }\n\n            // Tile-specific state\n            this.view.setupTile(tile, program);\n\n            // Render tile\n            let mesh = tile.meshes[style_name];\n            if (style.render(mesh)) {\n                // Don't incur additional renders while viewport is moving\n                if (!(this.view.panning || this.view.zooming)) {\n                   this.requestRedraw();\n                }\n            }\n            render_count += mesh.geometry_count;\n        }\n\n        return render_count;\n    }\n\n    setupStyle(style, program_key) {\n        // Get shader program from style, lazily compiling if necessary\n        let program;\n        try {\n            program = style.getProgram(program_key);\n            if (!program) {\n                return;\n            }\n        }\n        catch(error) {\n            this.trigger('warning', {\n                type: 'styles',\n                message: `Error compiling style ${style.name}`,\n                style,\n                shader_errors: style.program && style.program.shader_errors\n            });\n            return;\n        }\n\n        program.use();\n        style.setup();\n\n        program.uniform('1f', 'u_time', this.animated ? (((+new Date()) - this.start_time) / 1000) : 0);\n        this.view.setupProgram(program);\n        for (let i in this.lights) {\n            this.lights[i].setupProgram(program);\n        }\n\n        return program;\n    }\n\n    clearFrame({ clear_color, clear_depth } = {}) {\n        if (!this.initialized) {\n            return;\n        }\n\n        // Defaults\n        clear_color = (clear_color === false) ? false : true; // default true\n        clear_depth = (clear_depth === false) ? false : true; // default true\n\n        // Set GL state\n        this.render_states.depth_write.set({ depth_write: clear_depth });\n\n        let gl = this.gl;\n        if (clear_color || clear_depth) {\n            let mask = (clear_color && gl.COLOR_BUFFER_BIT) | (clear_depth && gl.DEPTH_BUFFER_BIT);\n            gl.clear(mask);\n        }\n    }\n\n    setRenderState({ depth_test, depth_write, cull_face, blend } = {}) {\n        if (!this.initialized) {\n            return;\n        }\n\n        // Defaults\n        // TODO: when we abstract out support for multiple render passes, these can be per-pass config options\n        let render_states = this.render_states;\n        depth_test = (depth_test === false) ? false : render_states.defaults.depth_test;      // default true\n        depth_write = (depth_write === false) ? false : render_states.defaults.depth_write;   // default true\n        cull_face = (cull_face === false) ? false : render_states.defaults.culling;           // default true\n        blend = (blend != null) ? blend : render_states.defaults.blending;                    // default false\n\n        // Reset frame state\n        let gl = this.gl;\n\n        render_states.depth_test.set({ depth_test: depth_test });\n        render_states.depth_write.set({ depth_write: depth_write });\n        render_states.culling.set({ cull: cull_face, face: render_states.defaults.culling_face });\n\n        // Blending of alpha channel is modified to account for WebGL alpha behavior, see:\n        // http://webglfundamentals.org/webgl/lessons/webgl-and-alpha.html\n        // http://stackoverflow.com/a/11533416\n        if (blend) {\n            // Opaque: all source, no destination\n            if (blend === 'opaque') {\n                render_states.blending.set({\n                    blend: false\n                });\n            }\n            // Traditional alpha blending\n            else if (blend === 'overlay' || blend === 'inlay') {\n                render_states.blending.set({\n                    blend: true,\n                    src: gl.SRC_ALPHA, dst: gl.ONE_MINUS_SRC_ALPHA,\n                    src_alpha: gl.ONE, dst_alpha: gl.ONE_MINUS_SRC_ALPHA\n                });\n            }\n            // Additive blending\n            else if (blend === 'add') {\n                render_states.blending.set({\n                    blend: true,\n                    src: gl.ONE, dst: gl.ONE\n                });\n            }\n            // Multiplicative blending\n            else if (blend === 'multiply') {\n                render_states.blending.set({\n                    blend: true,\n                    src: gl.ZERO, dst: gl.SRC_COLOR\n                });\n            }\n        }\n        else {\n            render_states.blending.set({ blend: false });\n        }\n    }\n\n    // Request feature selection at given pixel. Runs async and returns results via a promise.\n    getFeatureAt(pixel) {\n        if (!this.initialized) {\n            log('debug', \"Scene.getFeatureAt() called before scene was initialized\");\n            return Promise.resolve();\n        }\n\n        // Point scaled to [0..1] range\n        var point = {\n            x: pixel.x * Utils.device_pixel_ratio / this.view.size.device.width,\n            y: pixel.y * Utils.device_pixel_ratio / this.view.size.device.height\n        };\n\n        return this.selection.getFeatureAt(point).\n            then(selection => Object.assign(selection, { pixel })).\n            catch(error => Promise.resolve({ error }));\n    }\n\n    // Rebuild all tiles, without re-parsing the config or re-compiling styles\n    // sync: boolean of whether to sync the config object to the worker\n    // sources: optional array of data sources to selectively rebuild (by default all our rebuilt)\n    rebuild({ sync = true, sources = null, serialize_funcs, profile = false, fade_in = false } = {}) {\n        return new Promise((resolve, reject) => {\n            // Skip rebuild if already in progress\n            if (this.building) {\n                // Queue up to one rebuild call at a time, only save last request\n                if (this.building.queued && this.building.queued.reject) {\n                    // notify previous request that it did not complete\n                    log('debug', 'Scene.rebuild: request superceded by a newer call');\n                    this.building.queued.resolve(false); // false flag indicates rebuild request was superceded\n                }\n\n                // Save queued request\n                let options = { sync, sources, serialize_funcs, profile, fade_in };\n                this.building.queued = { resolve, reject, options };\n                log('trace', `Scene.rebuild(): queuing request`);\n                return;\n            }\n\n            // Track tile build state\n            this.building = { resolve, reject };\n\n            // Profiling\n            if (profile) {\n                this._profile('Scene.rebuild');\n            }\n\n            // Update config (in case JS objects were manipulated directly)\n            if (sync) {\n                this.syncConfigToWorker({ serialize_funcs });\n            }\n            this.resetFeatureSelection();\n            this.resetTime();\n\n            // Rebuild visible tiles\n            this.tile_manager.pruneToVisibleTiles();\n            this.tile_manager.forEachTile(tile => {\n                if (!sources || sources.indexOf(tile.source.name) > -1) {\n                    this.tile_manager.buildTile(tile, { fade_in });\n                }\n            });\n            this.tile_manager.updateTilesForView(); // picks up additional tiles for any new/changed data sources\n            this.tile_manager.checkBuildQueue();    // resolve immediately if no tiles to build\n        }).then(() => {\n            // Profiling\n            if (profile) {\n                this._profileEnd('Scene.rebuild');\n            }\n        });\n    }\n\n    // Tile manager finished building tiles\n    // TODO move to tile manager\n    tileManagerBuildDone() {\n        if (this.building) {\n            log('info', `Scene: build geometry finished`);\n            if (this.building.resolve) {\n                this.building.resolve(true);\n            }\n\n            // Another rebuild queued?\n            var queued = this.building.queued;\n            this.building = null;\n            if (queued) {\n                log('debug', `Scene: starting queued rebuild() request`);\n                this.rebuild(queued.options).then(queued.resolve, queued.reject);\n            }\n        }\n    }\n\n    /**\n       Load (or reload) the scene config\n       @return {Promise}\n    */\n    loadScene(config_source = null, config_path = null) {\n        this.config_source = config_source || this.config_source;\n        this.config_globals_applied = [];\n\n        if (typeof this.config_source === 'string') {\n            this.config_path = URLs.pathForURL(config_path || this.config_source);\n        }\n        else {\n            this.config_path = URLs.pathForURL(config_path);\n        }\n\n        return SceneLoader.loadScene(this.config_source, this.config_path).then(({config, bundle}) => {\n            this.config = config;\n            this.config_bundle = bundle;\n            return this.config;\n        });\n    }\n\n    // Add source to a scene, arguments `name` and `config` need to be provided:\n    //  - If the name doesn't match a sources it will create it\n    //  - the `config` obj follow the YAML scene spec, ex: ```{type: 'TopoJSON', url: \"//tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.topojson\"]}```\n    //    that looks like:\n    //\n    //      scene.setDataSource(\"osm\", {type: 'TopoJSON', url: \"//tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.topojson\" });\n    //\n    //  - also can be pass a ```data``` obj: ```{type: 'GeoJSON', data: JSObj ]}```\n    //\n    //      var geojson_data = {};\n    //      ...\n    //      scene.setDataSource(\"dynamic_data\", {type: 'GeoJSON', data: geojson_data });\n    //\n    setDataSource (name, config) {\n        if (!name || !config || !config.type || (!config.url && !config.data)) {\n            log('error', \"No name provided or not a valid config:\", name, config);\n            return;\n        }\n\n        let load = (this.config.sources[name] == null);\n        let source = this.config.sources[name] = Object.assign({}, config);\n\n        // Convert raw data into blob URL\n        if (source.data && typeof source.data === 'object') {\n            source.url = URLs.createObjectURL(new Blob([JSON.stringify(source.data)]));\n            delete source.data;\n        }\n\n        // Resolve paths relative to root scene bundle\n        SceneLoader.normalizeDataSource(source, this.config_bundle);\n\n        if (load) {\n            return this.updateConfig({ rebuild: { sources: [name] } });\n        } else {\n            return this.rebuild({ sources: [name] });\n        }\n    }\n\n    createDataSources() {\n        let reset = []; // sources to reset\n        let prev_source_names = Object.keys(this.sources);\n        let source_id = 0;\n\n        for (var name in this.config.sources) {\n            let source = this.config.sources[name];\n            let prev_source = this.sources[name];\n\n            try {\n                let config = Object.assign({}, source, { name, id: source_id++ });\n                this.sources[name] = DataSource.create(config, this.sources);\n                if (!this.sources[name]) {\n                    throw {};\n                }\n            }\n            catch(e) {\n                delete this.sources[name];\n                let message = `Could not create data source: ${e.message}`;\n                log('warn', `Scene: ${message}`, source);\n                this.trigger('warning', { type: 'sources', source, message });\n            }\n\n            // Data source changed?\n            if (DataSource.changed(this.sources[name], prev_source)) {\n                reset.push(name);\n            }\n        }\n\n        // Sources that were removed\n        prev_source_names.forEach(s => {\n            if (!this.config.sources[s]) {\n                delete this.sources[s]; // TODO: remove from workers too?\n                reset.push(s);\n            }\n        });\n\n        // Remove tiles from sources that have changed\n        if (reset.length > 0) {\n            this.tile_manager.removeTiles(tile => {\n                return (reset.indexOf(tile.source.name) > -1);\n            });\n        }\n\n        // Mark sources that will generate geometry tiles\n        // (all except those that are only raster sources attached to other sources)\n        for (let ln in this.config.layers) {\n            let layer = this.config.layers[ln];\n            if (layer.data && this.sources[layer.data.source]) {\n                this.sources[layer.data.source].builds_geometry_tiles = true;\n            }\n        }\n    }\n\n    // Load all textures in the scene definition\n    loadTextures() {\n        return Texture.createFromObject(this.gl, this.config.textures).\n            then(() => Texture.createDefault(this.gl)); // create a 'default' texture for placeholders\n    }\n\n    // Called (currently manually) after styles are updated in stylesheet\n    updateStyles() {\n        if (!this.initialized && !this.initializing) {\n            throw new Error('Scene.updateStyles() called before scene was initialized');\n        }\n\n        // (Re)build styles from config\n        this.styles = this.style_manager.build(this.config.styles);\n        this.style_manager.initStyles(this);\n\n        // Optionally set GL context (used when initializing or re-initializing GL resources)\n        for (let style in this.styles) {\n            this.styles[style].setGL(this.gl);\n        }\n\n        // Use explicitly set scene animation flag if defined, otherwise turn on animation if there are any animated styles\n        this.animated =\n            this.config.scene.animated !== undefined ?\n                this.config.scene.animated :\n                Object.keys(this.styles).some(s => this.styles[s].animated);\n\n        this.dirty = true;\n    }\n\n    // Get active camera - for public API\n    getActiveCamera() {\n        return this.view.getActiveCamera();\n    }\n\n    // Set active camera - for public API\n    setActiveCamera(name) {\n        return this.view.setActiveCamera(name);\n    }\n\n    // Create lighting\n    createLights() {\n        this.lights = {};\n        for (let i in this.config.lights) {\n            if (!this.config.lights[i] || typeof this.config.lights[i] !== 'object') {\n                continue;\n            }\n            let light = this.config.lights[i];\n            light.name = i.replace('-', '_'); // light names are injected in shaders, can't have hyphens\n            light.visible = (light.visible === false) ? false : true;\n            if (light.visible) {\n                this.lights[light.name] = Light.create(this.view, light);\n            }\n        }\n        Light.inject(this.lights);\n    }\n\n    // Set background color\n    setBackground() {\n        let bg = this.config.scene.background;\n        this.background = {};\n        if (bg && bg.color) {\n            this.background.color = StyleParser.parseColor(bg.color);\n        }\n        if (!this.background.color) {\n            this.background.color = [0, 0, 0, 0]; // default background TODO: vary w/scene alpha\n        }\n\n        // if background is fully opaque, set canvas background to match\n        if (this.background.color[3] === 1) {\n            this.canvas.style.backgroundColor =\n                `rgba(${this.background.color.map(c => Math.floor(c * 255)).join(', ')})`;\n        }\n        else {\n            this.canvas.style.backgroundColor = 'transparent';\n        }\n\n        this.gl.clearColor(...this.background.color);\n    }\n\n    // Turn introspection mode on/off\n    setIntrospection (val) {\n        this.introspection = val || false;\n        this.updating++;\n        return this.updateConfig().then(() => this.updating--);\n    }\n\n    // Update scene config, and optionally rebuild geometry\n    // rebuild can be boolean, or an object containing rebuild options to passthrough\n    updateConfig({ load_event = false, rebuild = true, serialize_funcs, fade_in = false } = {}) {\n        this.generation = ++Scene.generation;\n        this.updating++;\n\n        this.config = SceneLoader.applyGlobalProperties(this.config, this.config_globals_applied);\n        this.trigger(load_event ? 'load' : 'update', { config: this.config });\n\n        SceneLoader.hoistTextures(this.config); // move inline textures into global texture set\n        this.style_manager.init();\n        this.view.reset();\n        this.createLights();\n        this.createDataSources();\n        this.loadTextures();\n        this.setBackground();\n        FontManager.loadFonts(this.config.fonts);\n\n        // TODO: detect changes to styles? already (currently) need to recompile anyway when camera or lights change\n        this.updateStyles();\n\n        // Optionally rebuild geometry\n        let done = rebuild ?\n            this.rebuild(Object.assign({ serialize_funcs, fade_in }, typeof rebuild === 'object' && rebuild)) :\n            this.syncConfigToWorker({ serialize_funcs }); // rebuild() also syncs config\n\n        // Finish by updating bounds and re-rendering\n        this.updating--;\n        this.view.updateBounds();\n        this.requestRedraw();\n\n        return done;\n    }\n\n    // Serialize config and send to worker\n    syncConfigToWorker({ serialize_funcs = true } = {}) {\n        // Tell workers we're about to rebuild (so they can update styles, etc.)\n        let config_serialized =\n            serialize_funcs ? Utils.serializeWithFunctions(this.config) : JSON.stringify(this.config);\n        return WorkerBroker.postMessage(this.workers, 'self.updateConfig', {\n            config: config_serialized,\n            generation: this.generation,\n            introspection: this.introspection\n        });\n    }\n\n    // Listen to related objects\n    createListeners () {\n        this.listeners = {};\n\n        this.listeners.view = {\n            move: () => this.trigger('move')\n        };\n        this.view.subscribe(this.listeners.view);\n\n        this.listeners.texture = {\n            update: () => this.dirty = true,\n            warning: (data) => this.trigger('warning', Object.assign({ type: 'textures' }, data))\n        };\n        Texture.subscribe(this.listeners.texture);\n\n        this.listeners.scene_loader = {\n            error: (data) => this.trigger('error', Object.assign({ type: 'scene' }, data))\n        };\n        SceneLoader.subscribe(this.listeners.scene_loader);\n    }\n\n    destroyListeners () {\n        this.unsubscribeAll();\n        this.view.unsubscribe(this.listeners.view);\n        Texture.unsubscribe(this.listeners.texture);\n        SceneLoader.unsubscribe(this.listeners.scene_loader);\n        this.listeners = null;\n    }\n\n    resetFeatureSelection() {\n        if (!this.selection) {\n            this.selection = new FeatureSelection(this.gl, this.workers, () => this.building);\n        }\n        else if (this.workers) {\n            WorkerBroker.postMessage(this.workers, 'self.resetFeatureSelection');\n        }\n    }\n\n    // Gets the current feature selection map size across all workers. Returns a promise.\n    getFeatureSelectionMapSize() {\n        if (this.fetching_selection_map) {\n            return Promise.resolve(); // return undefined if already pending\n        }\n        this.fetching_selection_map = true;\n\n        return WorkerBroker.postMessage(this.workers, 'self.getFeatureSelectionMapSize')\n            .then(sizes => {\n                this.fetching_selection_map = false;\n                return sizes.reduce((a, b) => a + b);\n            });\n    }\n\n    // Reset internal clock, mostly useful for consistent experience when changing styles/debugging\n    resetTime() {\n        this.start_time = +new Date();\n    }\n\n    // Fires event when rendered tile set or style changes\n    updateViewComplete () {\n        if ((this.render_count_changed || this.generation !== this.last_complete_generation) &&\n            !this.tile_manager.isLoadingVisibleTiles()) {\n            this.last_complete_generation = this.generation;\n            CanvasText.pruneTextCache();\n            this.trigger('view_complete');\n        }\n    }\n\n    resetViewComplete () {\n        this.last_complete_generation = null;\n    }\n\n    // Take a screenshot\n    // Asynchronous because we have to wait for next render to capture buffer\n    // Returns a promise\n    screenshot () {\n        this.requestRedraw();\n        return this.media_capture.screenshot();\n    }\n\n    startVideoCapture () {\n        this.requestRedraw();\n        return this.media_capture.startVideoCapture();\n    }\n\n    stopVideoCapture () {\n        return this.media_capture.stopVideoCapture();\n    }\n\n\n    // Stats/debug/profiling methods\n\n    // Profile helpers, issues a profile on main thread & all workers\n    _profile(name) {\n        console.profile(`main thread: ${name}`);\n        WorkerBroker.postMessage(this.workers, 'self.profile', name);\n    }\n\n    _profileEnd(name) {\n        console.profileEnd(`main thread: ${name}`);\n        WorkerBroker.postMessage(this.workers, 'self.profileEnd', name);\n    }\n\n    // Debug config and functions\n    setupDebug () {\n        let scene = this;\n        this.debug = {\n            // Rebuild geometry a given # of times and print average, min, max timings\n            timeRebuild (num = 1, options = {}) {\n                let times = [];\n                let cycle = () => {\n                    let start = +new Date();\n                    scene.rebuild(options).then(() => {\n                        times.push(+new Date() - start);\n\n                        if (times.length < num) {\n                            cycle();\n                        }\n                        else {\n                            let avg = ~~(times.reduce((a, b) => a + b) / times.length);\n                            log('info', `Profiled rebuild ${num} times: ${avg} avg (${Math.min(...times)} min, ${Math.max(...times)} max)`);\n                        }\n                    });\n                };\n                cycle();\n            },\n\n            // Return geometry counts of visible tiles, grouped by style name\n            geometryCountByStyle () {\n                let counts = {};\n                scene.tile_manager.getRenderableTiles().forEach(tile => {\n                    for (let style in tile.meshes) {\n                        counts[style] = counts[style] || 0;\n                        counts[style] += tile.meshes[style].geometry_count;\n                    }\n                });\n                return counts;\n            },\n\n            geometryCountByBaseStyle () {\n                let style_counts = scene.debug.geometryCountByStyle();\n                let counts = {};\n                for (let style in style_counts) {\n                    let base = scene.styles[style].baseStyle();\n                    counts[base] = counts[base] || 0;\n                    counts[base] += style_counts[style];\n                }\n                return counts;\n            },\n\n            geometrySizeByStyle () {\n                let sizes = {};\n                scene.tile_manager.getRenderableTiles().forEach(tile => {\n                    for (let style in tile.meshes) {\n                        sizes[style] = sizes[style] || 0;\n                        sizes[style] += tile.meshes[style].buffer_size;\n                    }\n                });\n                return sizes;\n            },\n\n            geometrySizeByBaseStyle () {\n                let style_sizes = scene.debug.geometrySizeByStyle();\n                let sizes = {};\n                for (let style in style_sizes) {\n                    let base = scene.styles[style].baseStyle();\n                    sizes[base] = sizes[base] || 0;\n                    sizes[base] += style_sizes[style];\n                }\n                return sizes;\n            },\n\n            renderableTilesCount () {\n                return scene.tile_manager.getRenderableTiles().length;\n            }\n        };\n    }\n\n}\n\nScene.id = 0;         // unique id for a scene instance\nScene.generation = 0; // id that is incremented each time a scene config is re-parsed\n",
     "import Utils from './utils/utils';\nimport * as URLs from './utils/urls';\n\nimport JSZip from 'jszip';\nimport yaml from 'js-yaml';\n\nexport class SceneBundle {\n\n    constructor(url, path, parent = null) {\n        this.url = url;\n\n        // If a base path was provided, use it for resolving local bundle resources only if\n        // the base path is absolute, or this bundle's path is relative\n        if (path && (!URLs.isRelativeURL(path) || URLs.isRelativeURL(this.url))) {\n            this.path = path;\n        }\n        else {\n            this.path = URLs.pathForURL(this.url);\n        }\n\n        this.path_for_parent = path || this.path; // for resolving paths relative to a parent bundle\n        this.parent = parent;\n\n        // An ancestor bundle may be a container (e.g. zip file) that needs to resolve relative paths\n        // for any scenes it contains, e.g. `root.zip` has a `root.yaml` that includes a `folder/child.yaml`:\n        // resources within `child.yaml` must be resolved through the bundle for `root.zip`\n        this.container = null;\n        if (this.parent) {\n            if (this.parent.container) {\n                this.container = this.parent.container;\n            }\n            else if (this.parent.isContainer()) {\n                this.container = this.parent;\n            }\n        }\n    }\n\n    load() {\n        return loadResource(this.url);\n    }\n\n    // Info for retrieving a specific resource from this bundle\n    // url: fully qualified URL to retrieve the content of the resource (e.g. zips will transform this to blob URL)\n    // path: original path of the resource within the bundle (for resolving paths up the bundle tree)\n    // type: file extension (used for determining bundle type, `yaml` or `zip`)\n    resourceFor(url) {\n        return {\n            url: this.urlFor(url),\n            path: this.pathFor(url),\n            type: this.typeFor(url)\n        };\n    }\n\n    urlFor(url) {\n        if (isGlobal(url)) {\n            return url;\n        }\n\n        if (URLs.isRelativeURL(url) && this.container) {\n            return this.parent.urlFor(this.path_for_parent + url);\n        }\n        return URLs.addBaseURL(url, this.path);\n    }\n\n    pathFor(url) {\n        return URLs.pathForURL(url);\n    }\n\n    typeFor(url) {\n        return URLs.extensionForURL(url);\n    }\n\n    isContainer() {\n        return false;\n    }\n\n}\n\nexport class ZipSceneBundle extends SceneBundle {\n\n    constructor(url, path, parent) {\n        super(url, path, parent);\n        this.zip = null;\n        this.files = {};\n        this.root = null;\n        this.path = '';\n    }\n\n    isContainer() {\n        return true;\n    }\n\n    load() {\n        this.zip = new JSZip();\n\n        if (typeof this.url === 'string') {\n            return Utils.io(this.url, 60000, 'arraybuffer')\n                .then(body => this.zip.loadAsync(body))\n                .then(() => this.parseZipFiles())\n                .then(() => this.loadRoot())\n                .catch(e => Promise.reject(e));\n        } else {\n            return Promise.resolve(this);\n        }\n    }\n\n    urlFor(url) {\n        if (isGlobal(url)) {\n            return url;\n        }\n\n        if (URLs.isRelativeURL(url)) {\n            return this.urlForZipFile(URLs.flattenRelativeURL(url));\n        }\n        return super.urlFor(url);\n    }\n\n    typeFor(url) {\n        if (URLs.isRelativeURL(url)) {\n            return this.typeForZipFile(url);\n        }\n        return super.typeFor(url);\n    }\n\n    loadRoot() {\n        return this.findRoot()\n            .then(() => loadResource(this.urlForZipFile(this.root)));\n    }\n\n    findRoot() {\n        // There must be a single YAML file at the top level of the zip\n        const yamls = Object.keys(this.files)\n            .filter(path => this.files[path].depth === 0)\n            .filter(path => URLs.extensionForURL(path) === 'yaml');\n\n        if (yamls.length === 1) {\n            this.root = yamls[0];\n        }\n\n        // No root found\n        if (!this.root) {\n            let msg = `Could not find root scene for bundle '${this.url}': `;\n            msg += `The zip archive's root level must contain a single scene file with the '.yaml' extension. `;\n            if (yamls.length > 0) {\n                msg += `Found multiple YAML files at the root level: ${yamls.map(r => '\\'' + r + '\\'' ).join(', ')}.`;\n            }\n            else {\n                msg += `Found NO YAML files at the root level.`;\n            }\n            return Promise.reject(Error(msg));\n        }\n        return Promise.resolve();\n    }\n\n    parseZipFiles() {\n        let paths = [];\n        let queue = [];\n        this.zip.forEach((path, file) => {\n            if (!file.dir) {\n                paths.push(path);\n                queue.push(file.async('arraybuffer'));\n            }\n        });\n\n        return Promise.all(queue).then(data => {\n            for (let i=0; i < data.length; i++) {\n                let path = paths[i];\n                let depth = path.split('/').length - 1;\n                this.files[path] = {\n                    data: data[i],\n                    type: URLs.extensionForURL(path),\n                    depth\n                };\n            }\n        });\n    }\n\n    urlForZipFile(file) {\n        if (this.files[file]) {\n            if (!this.files[file].url) {\n                this.files[file].url = URLs.createObjectURL(new Blob([this.files[file].data]));\n            }\n\n            return this.files[file].url;\n        }\n    }\n\n    typeForZipFile(file) {\n        return this.files[file] && this.files[file].type;\n    }\n\n}\n\nexport function createSceneBundle(url, path, parent, type = null) {\n    if (type === 'zip' || (typeof url === 'string' && !URLs.isLocalURL(url) && URLs.extensionForURL(url) === 'zip')) {\n        return new ZipSceneBundle(url, path, parent);\n    }\n    return new SceneBundle(url, path, parent);\n}\n\n// References a global property?\nexport function isGlobal (val) {\n    if (val && val.slice(0, 7) === 'global.') {\n        return true;\n    }\n    return false;\n}\n\nfunction parseResource (body) {\n    var data;\n    try {\n        // jsyaml 'json' option allows duplicate keys\n        // Keeping this for backwards compatibility, but should consider migrating to requiring\n        // unique keys, as this is YAML spec. But Tangram ES currently accepts dupe keys as well,\n        // so should consider how best to unify.\n        data = yaml.safeLoad(body, { json: true });\n    } catch (e) {\n        throw e;\n    }\n    return data;\n}\n\nfunction loadResource (source) {\n    return new Promise((resolve, reject) => {\n        if (typeof source === 'string') {\n            Utils.io(source).then((body) => {\n                try {\n                    let data = parseResource(body);\n                    resolve(data);\n                }\n                catch(e) {\n                    reject(e);\n                }\n            }, reject);\n        } else {\n            resolve(source);\n        }\n    });\n}\n",
     "import log from './utils/log';\nimport GLSL from './gl/glsl';\nimport * as URLs from './utils/urls';\nimport mergeObjects from './utils/merge';\nimport subscribeMixin from './utils/subscribe';\nimport {createSceneBundle, isGlobal} from './scene_bundle';\n\nvar SceneLoader;\n\nexport default SceneLoader = {\n\n    // Load scenes definitions from URL & proprocess\n    loadScene(url, path = null) {\n        let errors = [];\n        return this.loadSceneRecursive({ url, path }, null, errors).\n            then(result => this.finalize(result)).\n            then(({ config, bundle }) => {\n                if (!config) {\n                    // root scene failed to load, reject with first error\n                    return Promise.reject(errors[0]);\n                }\n                else if (errors.length > 0) {\n                    // scene loaded, but some imports had errors\n                    errors.forEach(error => {\n                        let message = `Failed to import scene: ${error.url}`;\n                        log('error', message, error);\n                        this.trigger('error', { type: 'scene_import', message, error, url: error.url });\n                    });\n                }\n                return { config, bundle };\n            });\n    },\n\n    // Loads scene files from URL, recursively loading 'import' scenes\n    // Optional *initial* path only (won't be passed to recursive 'import' calls)\n    // Useful for loading resources in base scene file from a separate location\n    // (e.g. in Tangram Play, when modified local scene should still refer to original resource URLs)\n    loadSceneRecursive({ url, path, type }, parent, errors = []) {\n        if (!url) {\n            return Promise.resolve({});\n        }\n\n        let bundle = createSceneBundle(url, path, parent, type);\n\n        return bundle.load().then(config => {\n            if (config.import == null) {\n                return this.normalize(config, bundle);\n            }\n\n            // accept single entry or array\n            if (!Array.isArray(config.import)) {\n                config.import = [config.import]; // convert to array\n            }\n\n            // Collect URLs of scenes to import\n            let imports = [];\n            config.import.forEach(url => {\n                // Convert scene objects to URLs\n                if (typeof url === 'object') {\n                    url = URLs.createObjectURL(new Blob([JSON.stringify(url)]));\n                }\n\n                imports.push(bundle.resourceFor(url));\n            });\n            delete config.import; // don't want to merge this property\n\n            return Promise.\n                all(imports.map(resource => this.loadSceneRecursive(resource, bundle, errors))).\n                    then(results => {\n                        let configs = results.map(r => r.config);\n                        config = mergeObjects({}, ...configs, config);\n                        return this.normalize(config, bundle);\n                    });\n        }).catch(error => {\n            // Collect scene load errors as we go\n            error.url = url;\n            errors.push(error);\n            return {};\n        });\n    },\n\n    // Normalize properties that should be adjust within each local scene file (usually by path)\n    normalize(config, bundle) {\n        this.normalizeDataSources(config, bundle);\n        this.normalizeFonts(config, bundle);\n        this.normalizeTextures(config, bundle);\n        return { config, bundle };\n    },\n\n    // Expand paths for data source\n    normalizeDataSources(config, bundle) {\n        config.sources = config.sources || {};\n\n        for (let sn in config.sources) {\n            this.normalizeDataSource(config.sources[sn], bundle);\n        }\n\n        return config;\n    },\n\n    normalizeDataSource(source, bundle) {\n        source.url = bundle.urlFor(source.url);\n\n        if (Array.isArray(source.scripts)) {\n            source.scripts = source.scripts.map(url => bundle.urlFor(url));\n        }\n\n        return source;\n    },\n\n    // Expand paths for fonts\n    normalizeFonts(config, bundle) {\n        config.fonts = config.fonts || {};\n\n        for (let family in config.fonts) {\n            if (Array.isArray(config.fonts[family])) {\n                config.fonts[family].forEach(face => {\n                    face.url = face.url && bundle.urlFor(face.url);\n                });\n            }\n            else {\n                let face = config.fonts[family];\n                face.url = face.url && bundle.urlFor(face.url);\n            }\n        }\n\n        return config;\n    },\n\n    // Expand paths and centralize texture definitions for a scene object\n    normalizeTextures(config, bundle) {\n        config.textures = config.textures || {};\n\n        // Add current scene's base path to globally defined textures\n        // Only adds path for textures with relative URLs, so textures in imported scenes get the base\n        // path of their immediate scene file\n        if (config.textures) {\n            for (let tn in config.textures) {\n                let texture = config.textures[tn];\n                if (texture.url) {\n                    texture.url = bundle.urlFor(texture.url);\n                }\n            }\n        }\n\n        // Resolve URLs for inline textures\n        if (config.styles) {\n            for (let sn in config.styles) {\n                let style = config.styles[sn];\n\n                // Style `texture`\n                let tex = style.texture;\n                if (typeof tex === 'string' && !config.textures[tex] && !isGlobal(tex)) {\n                    style.texture = bundle.urlFor(tex);\n                }\n\n                // Material\n                if (style.material) {\n                    ['emission', 'ambient', 'diffuse', 'specular', 'normal'].forEach(prop => {\n                        // Material property has a texture\n                        let tex = style.material[prop] != null && style.material[prop].texture;\n                        if (typeof tex === 'string' && !config.textures[tex] && !isGlobal(tex)) {\n                            style.material[prop].texture = bundle.urlFor(tex);\n                        }\n                    });\n                }\n\n                // Shader uniforms\n                if (style.shaders && style.shaders.uniforms) {\n                    GLSL.parseUniforms(style.shaders.uniforms).forEach(({type, value, key, uniforms}) => {\n                        // Texture by URL (string-named texture not referencing existing texture definition)\n                        if (type === 'sampler2D' && typeof value === 'string' && !config.textures[value] && !isGlobal(value)) {\n                            uniforms[key] = bundle.urlFor(value);\n                        }\n                    });\n                }\n            }\n        }\n\n        return config;\n    },\n\n    // Substitutes global scene properties (those defined in the `config.global` object) for any style values\n    // of the form `global.`, for example `color: global.park_color` would be replaced with the value (if any)\n    // defined for the `park_color` property in `config.global.park_color`.\n    applyGlobalProperties(config, applied) {\n        if (!config.global || Object.keys(config.global).length === 0) {\n            return config; // no global properties to transform\n        }\n\n        // Parse properties from globals\n        const separator = ':';\n        const props = flattenProperties(config.global, separator);\n\n        // Re-apply previously applied properties\n        // NB: a current shortcoming here is that you cannot \"un-link\" a target property from a global\n        // at run-time. Once a global property substitution has been recorderd, it will always be re-applied\n        // on subsequent scene updates, even if the target property was updated to another literal value.\n        // This is unlikely to be a common occurrence an acceptable limitation for now.\n        applied.forEach(({ prop, target, key }) => {\n            if (target) {\n                target[key] = props[prop];\n                // log('info', `Re-applying ${prop} with value ${props[prop]} to key ${key} in`, target);\n            }\n        });\n\n        // Recursively look-up a global property name. Allows globals to refer to other globals, e.g.:\n        // global:\n        //    color: global.secret_color\n        //    secret_color: red\n        function lookupGlobalName (key, props, stack = []) {\n            if (stack.indexOf(key) > -1) {\n                log({ level: 'warn', once: true }, `Global properties: cyclical reference detected`, stack);\n                return;\n            }\n            stack.push(key);\n\n            const prop = (key.slice(0, 7) === 'global.') && (key.slice(7).replace(/\\./g, separator));\n            if (prop && props[prop] !== undefined) {\n                if (typeof props[prop] === 'string' && props[prop].slice(0, 7) === 'global.') {\n                    return lookupGlobalName(props[prop], props, stack);\n                }\n                return prop;\n            }\n        }\n\n        // Find and apply new properties\n        function applyGlobals (obj, target, key) {\n            // Convert string\n            if (typeof obj === 'string') {\n                const prop = lookupGlobalName(obj, props);\n                const val = props[prop];\n                if (val !== undefined) {\n                    // Save record of where property is applied\n                    applied.push({ prop, target, key });\n\n                    // Apply property\n                    obj = val;\n                }\n            }\n            // Loop through object properties\n            else if (typeof obj === 'object') {\n                for (let p in obj) {\n                    obj[p] = applyGlobals(obj[p], obj, p);\n                }\n            }\n            return obj;\n        }\n\n        return applyGlobals(config);\n    },\n\n    // Move inline (URL string) textures to the scene's top-level set of textures (config.textures).\n    // There are 3 such cases of textures:\n    // - in a style's `texture` property\n    // - in a style's `material` properties\n    // - in a style's custom uniforms (`shaders.uniforms`)\n    hoistTextures (config) {\n        if (config.styles) {\n            for (let sn in config.styles) {\n                let style = config.styles[sn];\n\n                // Style `texture`\n                let tex = style.texture;\n                if (typeof tex === 'string' && !config.textures[tex]) {\n                    let url = tex;\n                    let name = isGlobal(url) ? `texture-${url}` : url;\n                    config.textures[name] = { url };\n                    style.texture = name;\n                }\n\n                // Material\n                if (style.material) {\n                    ['emission', 'ambient', 'diffuse', 'specular', 'normal'].forEach(prop => {\n                        // Material property has a texture\n                        let tex = style.material[prop] != null && style.material[prop].texture;\n                        if (typeof tex === 'string' && !config.textures[tex]) {\n                            let url = tex;\n                            let name = isGlobal(url) ? `texture-${url}` : url;\n                            config.textures[name] = { url };\n                            style.material[prop].texture = name;\n                        }\n                    });\n                }\n\n                // Shader uniforms\n                if (style.shaders && style.shaders.uniforms) {\n                    GLSL.parseUniforms(style.shaders.uniforms).forEach(({type, value, key, uniforms}) => {\n                        // Texture by URL (string-named texture not referencing existing texture definition)\n                        if (type === 'sampler2D' && typeof value === 'string' && !config.textures[value]) {\n                            let url = value;\n                            let name = isGlobal(url) ? `texture-${url}` : url;\n                            config.textures[name] = { url };\n                            uniforms[key] = name;\n                        }\n                    });\n                }\n            }\n        }\n    },\n\n    // Normalize some scene-wide settings that apply to the final, merged scene\n    finalize({ config, bundle }) {\n        if (!config) {\n            return {};\n        }\n\n        // Ensure top-level properties\n        config.scene = config.scene || {};\n        config.cameras = config.cameras || {};\n        config.lights = config.lights || {};\n        config.styles = config.styles || {};\n        config.layers = config.layers || {};\n\n        // If only one camera specified, set it as default\n        if (config.camera) {\n            config.cameras.default = config.camera;\n        }\n\n        // If no cameras specified, create one\n        if (Object.keys(config.cameras).length === 0) {\n            config.cameras.default = {};\n        }\n\n        // If no lights specified, create default\n        if (Object.keys(config.lights).length === 0 ||\n            Object.keys(config.lights).every(i => config.lights[i].visible === false)) {\n            config.lights.default_light = {\n                type: 'directional'\n            };\n        }\n\n        return { config, bundle };\n    }\n\n};\n\n// Flatten nested properties for simpler string look-ups\n// e.g. global.background.color -> 'global:background:color'\nfunction flattenProperties (obj, separator = ':', prefix = null, props = {}) {\n    prefix = prefix ? (prefix + separator) : '';\n\n    for (let p in obj) {\n        let key = prefix + p;\n        let val = obj[p];\n        props[key] = val;\n\n        if (typeof val === 'object' && !Array.isArray(val)) {\n            flattenProperties(val, separator, key, props);\n        }\n    }\n    return props;\n}\n\nsubscribeMixin(SceneLoader);\n",
     "/*jshint worker: true*/\nimport Thread from './utils/thread';\nimport Utils from './utils/utils';\nimport log from './utils/log';\nimport WorkerBroker from './utils/worker_broker'; // jshint ignore:line\nimport Tile from './tile';\nimport DataSource from './sources/data_source';\nimport FeatureSelection from './selection';\nimport {StyleParser} from './styles/style_parser';\nimport {StyleManager} from './styles/style_manager';\nimport {parseLayers} from './styles/layer';\nimport Texture from './gl/texture';\n\nexport var SceneWorker = self;\n\n// Worker functionality will only be defined in worker thread\nif (Thread.is_worker) {\n\nObject.assign(self, {\n\n    FeatureSelection,\n\n    sources: {},\n    styles: {},\n    layers: {},\n    tiles: {},\n    objects: {},\n    config: {},     // raw config (e.g. functions, etc. not expanded)\n\n    // Initialize worker\n    init (scene_id, worker_id, num_workers, log_level, device_pixel_ratio) {\n        self.scene_id = scene_id;\n        self._worker_id = worker_id;\n        self.num_workers = num_workers;\n        log.setLevel(log_level);\n        Utils.device_pixel_ratio = device_pixel_ratio;\n        FeatureSelection.setPrefix(self._worker_id);\n        self.style_manager = new StyleManager();\n        return worker_id;\n    },\n\n    // Starts a config refresh\n    updateConfig ({ config, generation, introspection }) {\n        config = JSON.parse(config);\n\n        self.generation = generation;\n        self.introspection = introspection;\n\n        // Data block functions are not context wrapped like the rest of the style functions are\n        // TODO: probably want a cleaner way to exclude these\n        for (let layer in config.layers) {\n            if (config.layers[layer]) {\n                config.layers[layer].data = Utils.stringsToFunctions(config.layers[layer].data);\n            }\n        }\n\n        // Expand global properties\n        self.global = Utils.stringsToFunctions(config.global);\n\n        // Create data sources\n        self.createDataSources(config);\n\n        // Expand styles\n        config.styles = Utils.stringsToFunctions(config.styles, StyleParser.wrapFunction);\n        self.styles = self.style_manager.build(config.styles);\n        self.style_manager.initStyles({\n            generation: self.generation,\n            styles: self.styles,\n            sources: self.sources,\n            introspection: self.introspection\n        });\n\n        // Parse each top-level layer as a separate tree\n        self.layers = parseLayers(config.layers, self.style_manager.styles);\n\n        // Sync tetxure info from main thread\n        self.syncing_textures = self.syncTextures(config.textures);\n\n        // Return promise for when config refresh finishes\n        self.configuring = self.syncing_textures.then(() => {\n            log('debug', `updated config`);\n        });\n    },\n\n    // Create data sources and clear tile cache if necessary\n    createDataSources (config) {\n        // Save and compare previous sources\n        self.last_config_sources = self.config_sources || {};\n        self.config_sources = config.sources;\n        let last_sources = self.sources;\n        let changed = false;\n\n        // Parse new sources\n        config.sources = Utils.stringsToFunctions(config.sources);\n        self.sources = {}; // clear previous sources\n        for (let name in config.sources) {\n            if (JSON.stringify(self.last_config_sources[name]) === JSON.stringify(config.sources[name])) {\n                self.sources[name] = last_sources[name];\n                continue;\n            }\n\n            let source;\n            try {\n                source = DataSource.create(Object.assign({}, config.sources[name], {name}), self.sources);\n            }\n            catch(e) {\n                continue;\n            }\n\n            if (!source) {\n                continue;\n            }\n            self.sources[name] = source;\n            changed = true;\n        }\n\n        // Clear tile cache if any data sources changed\n        if (changed) {\n            self.tiles = {};\n        }\n    },\n\n    // Returns a promise that fulfills when config refresh is finished\n    awaitConfiguration () {\n        return self.configuring;\n    },\n\n    // Build a tile: load from tile source if building for first time, otherwise rebuild with existing data\n    buildTile ({ tile }) {\n        // Tile cached?\n        if (self.getTile(tile.key) != null) {\n            // Already loading?\n            if (self.getTile(tile.key).loading === true) {\n                return;\n            }\n        }\n\n        // Update tile cache\n        tile = self.tiles[tile.key] = Object.assign(self.getTile(tile.key) || {}, tile);\n\n        // Update config (styles, etc.), then build tile\n        return self.awaitConfiguration().then(() => {\n            // First time building the tile\n            if (tile.loaded !== true) {\n\n                tile.loading = true;\n                tile.loaded = false;\n                tile.error = null;\n\n                self.loadTileSourceData(tile).then(() => {\n                    if (!self.getTile(tile.key)) {\n                        log('trace', `stop tile build after data source load because tile was removed: ${tile.key}`);\n                        return;\n                    }\n\n                    // Warn and continue on data source error\n                    if (tile.source_data.error) {\n                        log('warn', `tile load error(s) for ${tile.key}: ${tile.source_data.error}`);\n                    }\n\n                    tile.loading = false;\n                    tile.loaded = true;\n                    Tile.buildGeometry(tile, self);\n                }).catch((error) => {\n                    tile.loading = false;\n                    tile.loaded = false;\n                    tile.error = error.stack;\n                    log('error', `tile load error for ${tile.key}: ${tile.error}`);\n\n                    // Send error to main thread\n                    WorkerBroker.postMessage(`TileManager_${self.scene_id}.buildTileError`, Tile.slice(tile));\n                });\n            }\n            // Tile already loaded, just rebuild\n            else {\n                log('trace', `used worker cache for tile ${tile.key}`);\n\n                // Build geometry\n                try {\n                    Tile.buildGeometry(tile, self);\n                }\n                catch(error) {\n                    // Send error to main thread\n                    tile.error = error.toString();\n                    WorkerBroker.postMessage(`TileManager_${self.scene_id}.buildTileError`, Tile.slice(tile));\n                }\n            }\n        });\n    },\n\n    // Load this tile's data source\n    loadTileSourceData (tile) {\n        if (self.sources[tile.source]) {\n            return self.sources[tile.source].load(tile);\n        }\n        else {\n            tile.source_data = {};\n            return Promise.resolve(tile);\n        }\n    },\n\n    getTile(key) {\n        return self.tiles[key];\n    },\n\n    // Remove tile\n    removeTile (key) {\n        var tile = self.tiles[key];\n\n        if (tile != null) {\n            // Cancel if loading\n            if (tile.loading === true) {\n                log('trace', `cancel tile load for ${key}`);\n                tile.loading = false;\n                Tile.cancel(tile);\n            }\n\n            // Remove from cache\n            FeatureSelection.clearTile(key);\n            delete self.tiles[key];\n            log('trace', `remove tile from cache for ${key}`);\n        }\n    },\n\n    // Get a feature from the selection map\n    getFeatureSelection ({ id, key } = {}) {\n        var selection = FeatureSelection.map[key];\n\n        return {\n            id: id,\n            feature: (selection && selection.feature)\n        };\n    },\n\n    // Resets the feature selection state\n    resetFeatureSelection () {\n        FeatureSelection.reset();\n    },\n\n    // Selection map size for this worker\n    getFeatureSelectionMapSize () {\n        return FeatureSelection.getMapSize();\n    },\n\n    // Texture info needs to be synced from main thread, e.g. width/height, which we only know after the texture loads\n    syncTextures (tex_config) {\n        let textures = [];\n        if (tex_config) {\n            textures.push(...Object.keys(tex_config));\n        }\n\n        log('trace', 'sync textures to worker:', textures);\n        if (textures.length > 0) {\n            return Texture.syncTexturesToWorker(textures);\n        }\n        return Promise.resolve();\n    },\n\n    // Sync device pixel ratio from main thread\n    updateDevicePixelRatio (device_pixel_ratio) {\n        Utils.device_pixel_ratio = device_pixel_ratio;\n    },\n\n    // Profiling helpers\n    profile (name) {\n        console.profile(`worker ${self._worker_id}: ${name}`);\n    },\n\n    profileEnd (name) {\n        console.profileEnd(`worker ${self._worker_id}: ${name}`);\n    }\n\n});\n\nWorkerBroker.addTarget('self', self);\n\n}\n",
@@ -514,19 +514,19 @@
     "import DataSource, {NetworkTileSource} from './data_source';\nimport Tile from '../tile';\nimport Geo from '../geo';\n\nexport class RasterTileSource extends NetworkTileSource {\n\n    constructor(source, sources) {\n        super(source, sources);\n\n        if (this.rasters.indexOf(this.name) === -1) {\n            this.rasters.unshift(this.name); // add this raster as the first\n        }\n        this.filtering = source.filtering; // optional texture filtering (nearest, linear, mipmap)\n\n        // save texture objects by tile key, so URL remains stable if tile is built multiple times,\n        // e.g. avoid re-loading the same tile texture under a different subdomain when using tile hosts\n        this.textures = {};\n    }\n\n    load(tile) {\n        tile.source_data = {};\n        tile.source_data.layers = {};\n        tile.pad_scale = this.pad_scale;\n        tile.rasters = [...this.rasters]; // copy list of rasters to load for tile\n\n        // Generate a single quad that fills the entire tile\n        let scale = Geo.tile_scale;\n        tile.source_data.layers = {\n            _default: {\n                type: 'FeatureCollection',\n                features: [{\n                    geometry: {\n                        type: 'Polygon',\n                        coordinates: [[\n                            [0, 0], [scale, 0],\n                            [scale, -scale], [0, -scale], [0, 0]\n                        ]]\n                    },\n                    properties: {}\n                }]\n            }\n        };\n\n        tile.default_winding = 'CW';\n        return Promise.resolve(tile);\n    }\n\n    // Return texture info for a raster tile\n    tileTexture (tile) {\n        let key = tile.coords.key;\n        if (!this.textures[key]) {\n            let coords = Tile.coordinateWithMaxZoom(tile.coords, this.max_zoom);\n            let url = this.formatUrl(this.url, { coords });\n            this.textures[key] = { url, filtering: this.filtering, coords };\n        }\n        return this.textures[key];\n    }\n\n}\n\nDataSource.register(RasterTileSource, 'Raster');\n",
     "import DataSource from './data_source';\nimport {GeoJSONSource, GeoJSONTileSource} from './geojson';\n\nimport * as topojson from 'topojson-client';\n\n/**\n TopoJSON standalone (non-tiled) source\n Uses geojson-vt split into tiles client-side\n*/\n\nexport class TopoJSONSource extends GeoJSONSource {\n\n    parseSourceData (tile, source, response) {\n        let data = JSON.parse(response);\n        data = this.toGeoJSON(data);\n\n        let layers = this.getLayers(data);\n        super.preprocessLayers(layers);\n        source.layers = layers;\n    }\n\n    toGeoJSON (data) {\n        // Single layer\n        if (data.objects &&\n            Object.keys(data.objects).length === 1) {\n            let layer = Object.keys(data.objects)[0];\n            data = getTopoJSONFeature(data, data.objects[layer]);\n        }\n        // Multiple layers\n        else {\n            let layers = {};\n            for (let key in data.objects) {\n                layers[key] = getTopoJSONFeature(data, data.objects[key]);\n            }\n            data = layers;\n        }\n        return data;\n    }\n\n}\n\nfunction getTopoJSONFeature (topology, object) {\n    let feature = topojson.feature(topology, object);\n\n    // Convert single feature to a feature collection\n    if (feature.type === 'Feature') {\n        feature = {\n            type: 'FeatureCollection',\n            features: [feature]\n        };\n    }\n    return feature;\n}\n\n\n/**\n TopoJSON vector tiles\n @class TopoJSONTileSource\n*/\nexport class TopoJSONTileSource extends GeoJSONTileSource {\n\n    constructor(source, sources) {\n        super(source, sources);\n\n        // Replace with non-tiled source if tiled source failed to instantiate\n        if (!this.urlHasTilePattern(this.url)) {\n            return new TopoJSONSource(source);\n        }\n    }\n\n    parseSourceData (tile, source, response) {\n        let data = JSON.parse(response);\n        data = TopoJSONSource.prototype.toGeoJSON(data);\n        this.prepareGeoJSON(data, tile, source);\n    }\n\n}\n\nDataSource.register(TopoJSONTileSource, 'TopoJSON');        // prefered shorter name\n",
     "function notNull(x)  { return x != null; }\nfunction wrap(x)     { return '(' + x + ')';}\n\nfunction maybeQuote(value) {\n    if (typeof value === 'string') {\n        return '\"' + value + '\"';\n    }\n    return value;\n}\n\nfunction lookUp(key) {\n    if (key[0] === '$') {\n        return 'context[\\'' + key.substring(1) + '\\']';\n    }\n    return 'context.feature.properties[\\'' + key + '\\']';\n}\n\nfunction nullValue(key, value) {\n    return ' true ';\n}\n\nfunction propertyEqual(key, value) {\n    return wrap(maybeQuote(value) + ' === ' + lookUp(key));\n}\n\nfunction propertyOr(key, values) {\n    return wrap(values.map(function (x) { return propertyEqual(key, x); }).join(' || '));\n}\n\nfunction printNested(values, joiner) {\n    return wrap(values.filter(notNull).map(function (x) {\n        return wrap(x.join(' && '));\n    }).join(' ' + joiner + ' '));\n}\n\nfunction any(_, values, options) {\n    return (values && values.length > 0) ? printNested(values.map(function(v) { return parseFilter(v, options); }), '||') : 'true';\n}\n\nfunction all(_, values, options) {\n    return (values && values.length > 0) ? printNested(values.map(function(v) { return parseFilter(v, options); }), '&&') : 'true';\n}\n\nfunction not(key, value, options) {\n    return '!' + wrap(parseFilter(value, options).join(' && '));\n}\n\nfunction none(key, values, options) {\n    return '!' + wrap(any(null, values, options));\n}\n\nfunction propertyMatchesBoolean(key, value) {\n    return wrap(lookUp(key) + (value ? ' != ' : ' == ')  + 'null');\n}\n\nfunction rangeMatch(key, values, options) {\n    var expressions = [];\n    var transform = options && (typeof options.rangeTransform === 'function') && options.rangeTransform;\n\n    if (values.max) {\n        var max = transform ? transform(values.max) : values.max;\n        expressions.push('' + lookUp(key) + ' < ' + max);\n    }\n\n    if (values.min) {\n        var min = transform ? min = transform(values.min) : values.min;\n        expressions.push('' + lookUp(key) + ' >= ' + min);\n    }\n\n    return wrap(expressions.join(' && '));\n}\n\nfunction parseFilter(filter, options) {\n    var filterAST = [];\n\n    // Function filter\n    if (typeof filter === 'function') {\n        return [wrap(filter.toString() + '(context)')];\n    }\n    // Array filter, implicit 'any'\n    else if (Array.isArray(filter)) {\n        return [any(null, filter, options)];\n    }\n    // Null filter object\n    else if (filter == null) {\n        return ['true'];\n    }\n\n    // Object filter, e.g. implicit 'all'\n    var keys = Object.keys(filter);\n    for (var k=0; k < keys.length; k++) {\n        var key = keys[k];\n\n        var value = filter[key],\n            type  = typeof value;\n        if (type === 'string' || type === 'number') {\n            filterAST.push(propertyEqual(key, value));\n        } else if (type === 'boolean') {\n            filterAST.push(propertyMatchesBoolean(key, value));\n        } else if (key === 'not') {\n            filterAST.push(not(key, value, options));\n        } else if (key === 'any') {\n            filterAST.push(any(key, value, options));\n        } else if (key === 'all') {\n            filterAST.push(all(key, value, options));\n        } else if (key === 'none') {\n            filterAST.push(none(key, value, options));\n        } else if (Array.isArray(value)) {\n            filterAST.push(propertyOr(key, value));\n        } else if (type === 'object' && value != null) {\n            if (value.max || value.min) {\n                filterAST.push(rangeMatch(key, value, options));\n            }\n        } else if (value == null) {\n            filterAST.push(nullValue(key, value));\n        } else {\n            throw new Error('Unknown Query syntax: ' + value);\n        }\n    }\n\n    return keys.length === 0 ? ['true'] : filterAST;\n}\n\nfunction filterToString(filterAST) {\n    return wrap(filterAST.join(' && '));\n}\n\nexport function buildFilter(filter, options) {\n    if (filter == null) { return function () { return true; }; }\n    // jshint evil: true\n    return new Function('context', 'return ' + filterToString(parseFilter(filter, options)) + ';');\n}\n",
-    "import {StyleParser} from './style_parser';\nimport Utils from '../utils/utils';\nimport log from '../utils/log';\nimport mergeObjects from '../utils/merge';\nimport {buildFilter} from './filter';\n\n// N.B.: 'visible' is legacy compatibility for 'enabled'\nexport const whiteList = ['filter', 'draw', 'visible', 'enabled', 'data'];\n\nexport const layer_cache = {};\n\nfunction cacheKey (layers) {\n    if (layers.length > 1) {\n        var k = layers[0];\n        for (var i=1; i < layers.length; i++) {\n            k += '/' + layers[i];\n        }\n\n        return k;\n    }\n    return layers[0];\n}\n\n// Merge matching layer trees into a final draw group\nexport function mergeTrees(matchingTrees, group) {\n    let draws, treeDepth = 0;\n\n    let draw = {\n        visible: true // visible by default\n    };\n\n    // Find deepest tree\n    for (let t=0; t < matchingTrees.length; t++) {\n        if (matchingTrees[t].length > treeDepth) {\n            treeDepth = matchingTrees[t].length;\n        }\n    }\n\n    // No layers to parse\n    if (treeDepth === 0) {\n        return null;\n    }\n\n    // Iterate trees in parallel\n    for (let x=0; x < treeDepth; x++) {\n        // Pull out the requested draw group, for each tree, at this depth\n        draws = matchingTrees.map(tree => tree[x] && tree[x][group]);\n        if (draws.length === 0) {\n            continue;\n        }\n\n        // Sort by layer name before merging, so layers are applied deterministically\n        // when multiple layers modify the same properties\n        draws.sort((a, b) => (a && a.layer_name) > (b && b.layer_name) ? 1 : -1);\n\n        // Merge draw objects\n        mergeObjects(draw, ...draws);\n\n        // Remove layer names, they were only used transiently to sort and calculate final layer\n        // (final merged names will not be accurate since only one tree can win)\n        delete draw.layer_name;\n    }\n\n    // Short-circuit if not visible\n    if (draw.visible === false) {\n        return null;\n    }\n\n    return draw;\n}\n\nconst blacklist = ['any', 'all', 'not', 'none'];\n\nclass Layer {\n\n    constructor({ layer, name, parent, draw, visible, enabled, filter }) {\n        this.id = Layer.id++;\n        this.config_data = layer.data;\n        this.parent = parent;\n        this.name = name;\n        this.full_name = this.parent ? (this.parent.full_name + ':' + this.name) : this.name;\n        this.draw = draw;\n        this.filter = filter;\n        this.is_built = false;\n\n        enabled = (enabled === undefined) ? visible : enabled; // `visible` property is backwards compatible for `enabled`\n        if (this.parent && this.parent.visible === false) {\n            this.enabled = false; // all descendants of disabled layer are also disabled\n        }\n        else {\n            this.enabled = (enabled !== false); // layer is enabled unless explicitly set to disabled\n        }\n\n        // Denormalize layer name to draw groups\n        if (this.draw) {\n            for (let group in this.draw) {\n                this.draw[group] = (this.draw[group] == null) ? {} : this.draw[group];\n                if (typeof this.draw[group] !== 'object') {\n                    // Invalid draw group\n                    let msg = `Draw group '${group}' for layer ${this.full_name} is invalid, must be an object, `;\n                    msg += `but was set to \\`${group}: ${this.draw[group]}\\` instead`;\n                    log('warn', msg); // TODO: fire external event that clients to subscribe to\n\n                    delete this.draw[group];\n                }\n                else {\n                    this.draw[group].layer_name = this.full_name;\n                }\n            }\n        }\n    }\n\n    build () {\n        log('trace', `Building layer '${this.full_name}'`);\n        this.buildFilter();\n        this.buildDraw();\n        this.is_built = true;\n    }\n\n    buildDraw() {\n        this.draw = Utils.stringsToFunctions(this.draw, StyleParser.wrapFunction);\n        this.calculatedDraw = calculateDraw(this);\n    }\n\n    buildFilter() {\n        this.filter_original = this.filter;\n        this.filter = Utils.stringsToFunctions(this.filter, StyleParser.wrapFunction);\n\n        let type = typeof this.filter;\n        if (this.filter != null && type !== 'object' && type !== 'function') {\n            // Invalid filter\n            let msg = `Filter for layer ${this.full_name} is invalid, filter value must be an object or function, `;\n            msg += `but was set to \\`filter: ${this.filter}\\` instead`;\n            log('warn', msg); // TODO: fire external event that clients to subscribe to\n            return;\n        }\n\n        try {\n            this.buildZooms();\n            this.buildPropMatches();\n            if (this.filter != null && (typeof this.filter === 'function' || Object.keys(this.filter).length > 0)) {\n                this.filter = buildFilter(this.filter, FilterOptions);\n            }\n            else {\n                this.filter = null;\n            }\n        }\n        catch(e) {\n            // Invalid filter\n            let msg = `Filter for layer ${this.full_name} is invalid, \\`filter: ${JSON.stringify(this.filter)}\\` `;\n            msg += `failed with error '${e.message}', stack trace: ${e.stack}`;\n            log('warn', msg); // TODO: fire external event that clients to subscribe to\n        }\n    }\n\n    // Zooms often cull large swaths of the layer tree, so they get special treatment and are checked first\n    buildZooms() {\n        let zoom = this.filter && this.filter.$zoom;\n        let ztype = typeof zoom;\n        if (zoom != null && ztype !== 'function') { // don't accelerate function-based filters\n            this.zooms = {};\n\n            if (ztype === 'number') {\n                this.zooms[zoom] = true;\n            }\n            else if (Array.isArray(zoom)) {\n                for (let z=0; z < zoom.length; z++) {\n                    this.zooms[zoom[z]] = true;\n                }\n            }\n            else if (ztype === 'object' && (zoom.min != null || zoom.max != null)) {\n                let zmin = zoom.min || 0;\n                let zmax = zoom.max || 25; // TODO: replace constant for max possible zoom\n                for (let z=zmin; z < zmax; z++) {\n                    this.zooms[z] = true;\n                }\n            }\n\n            delete this.filter.$zoom; // don't process zoom through usual generic filter logic\n        }\n    }\n\n    buildPropMatches() {\n        if (!this.filter || Array.isArray(this.filter) || typeof this.filter === 'function') {\n            return;\n        }\n\n        Object.keys(this.filter).forEach(key => {\n            if (blacklist.indexOf(key) === -1) {\n                let val = this.filter[key];\n                let type = typeof val;\n                let array = Array.isArray(val);\n\n                if (!(array || type === 'string' || type === 'number')) {\n                    return;\n                }\n\n                if (key[0] === '$') {\n                    // Context property\n                    this.context_prop_matches = this.context_prop_matches || [];\n                    this.context_prop_matches.push([key.substring(1), array ? val : [val]]);\n                }\n                else {\n                    // Feature property\n                    this.feature_prop_matches = this.feature_prop_matches || [];\n                    this.feature_prop_matches.push([key, array ? val : [val]]);\n                }\n\n                delete this.filter[key];\n            }\n        });\n    }\n\n    doPropMatches (context) {\n        if (this.feature_prop_matches) {\n            for (let r=0; r < this.feature_prop_matches.length; r++) {\n                let match = this.feature_prop_matches[r];\n                let val = context.feature.properties[match[0]];\n                if (val == null || match[1].indexOf(val) === -1) {\n                    return false;\n                }\n            }\n        }\n\n        if (this.context_prop_matches) {\n            for (let r=0; r < this.context_prop_matches.length; r++) {\n                let match = this.context_prop_matches[r];\n                let val = context[match[0]];\n                if (val == null || match[1].indexOf(val) === -1) {\n                    return false;\n                }\n            }\n        }\n\n        return true;\n    }\n\n    doesMatch (context) {\n        if (!this.enabled) {\n            return false;\n        }\n\n        if (!this.is_built) {\n            this.build();\n        }\n\n        // zoom pre-filter: skip rest of filter if out of layer zoom range\n        if (this.zooms != null && !this.zooms[context.zoom]) {\n            return false;\n        }\n\n        // direct feature property matches\n        if (!this.doPropMatches(context)) {\n            return false;\n        }\n\n        // any remaining filter (more complex matches or dynamic function)\n        if (this.filter instanceof Function){\n            try {\n                return this.filter(context);\n            }\n            catch (error) {\n                // Filter function error\n                let msg = `Filter for this ${this.full_name}: \\`filter: ${this.filter_original}\\` `;\n                msg += `failed with error '${error.message}', stack trace: ${error.stack}`;\n                log('error', msg, context.feature);\n            }\n        }\n        else {\n            return this.filter == null;\n        }\n    }\n\n}\n\nLayer.id = 0;\n\n\nexport class LayerLeaf extends Layer {\n    constructor (config) {\n        super(config);\n        this.is_leaf = true;\n    }\n\n}\n\nexport class LayerTree extends Layer {\n    constructor (config) {\n        super(config);\n        this.is_tree = true;\n        this.layers = config.layers || [];\n    }\n\n    addLayer (layer) {\n        this.layers.push(layer);\n    }\n\n    buildDrawGroups (context) {\n        let layers = [], layer_ids = [];\n        matchFeature(context, [this], layers, layer_ids);\n\n        if (layers.length > 0) {\n            let cache_key = cacheKey(layer_ids);\n\n            // Only evaluate each layer combination once (undefined means not yet evaluated,\n            // null means evaluated with no draw object)\n            if (layer_cache[cache_key] === undefined) {\n                // Find all the unique visible draw blocks for this layer tree\n                let draw_groups = layers.map(x => x && x.visible !== false && x.calculatedDraw);\n                let draw_keys = {};\n\n                for (let r=0; r < draw_groups.length; r++) {\n                    let layer = draw_groups[r];\n                    if (!layer) {\n                        continue;\n                    }\n                    for (let g=0; g < layer.length; g++) {\n                        let group = layer[g];\n                        for (let key in group) {\n                            draw_keys[key] = true;\n                        }\n                    }\n                }\n\n                // Calculate each draw group\n                for (let draw_key in draw_keys) {\n                    layer_cache[cache_key] = layer_cache[cache_key] || {};\n                    layer_cache[cache_key][draw_key] = mergeTrees(draw_groups, draw_key);\n\n                    // Only save the ones that weren't null\n                    if (!layer_cache[cache_key][draw_key]) {\n                        delete layer_cache[cache_key][draw_key];\n                    }\n                    else {\n                        layer_cache[cache_key][draw_key].key = cache_key + '/' + draw_key;\n                        layer_cache[cache_key][draw_key].layers = layers.map(x => x && x.full_name);\n                    }\n                }\n\n                // No layers evaluated\n                if (layer_cache[cache_key] && Object.keys(layer_cache[cache_key]).length === 0) {\n                    layer_cache[cache_key] = null;\n                }\n            }\n            return layer_cache[cache_key];\n        }\n    }\n\n}\n\nconst FilterOptions = {\n    // Handle unit conversions on filter ranges\n    rangeTransform(val) {\n        if (typeof val === 'string' && val.trim().slice(-3) === 'px2') {\n            return `${parseFloat(val)} * context.meters_per_pixel_sq`;\n        }\n        return val;\n    }\n};\n\nfunction isWhiteListed(key) {\n    return whiteList.indexOf(key) > -1;\n}\n\nfunction isEmpty(obj) {\n    return Object.keys(obj).length === 0;\n}\n\nexport function groupProps(obj) {\n    let whiteListed = {}, nonWhiteListed = {};\n\n    for (let key in obj) {\n        if (isWhiteListed(key)) {\n            whiteListed[key] = obj[key];\n        } else {\n            nonWhiteListed[key] = obj[key];\n        }\n    }\n    return [whiteListed, nonWhiteListed];\n}\n\nexport function calculateDraw(layer) {\n\n    let draw  = [];\n\n    if (layer.parent) {\n        let cs = layer.parent.calculatedDraw || [];\n        draw.push(...cs);\n    }\n\n    draw.push(layer.draw);\n    return draw;\n}\n\nexport function parseLayerTree(name, layer, parent, styles) {\n\n    layer = (layer == null) ? {} : layer;\n\n    let properties = { name, layer, parent };\n    let [whiteListed, nonWhiteListed] = groupProps(layer);\n    let empty = isEmpty(nonWhiteListed);\n    let Create;\n\n    if (empty && parent != null) {\n        Create = LayerLeaf;\n    } else {\n        Create = LayerTree;\n    }\n\n    let r = new Create(Object.assign(properties, whiteListed));\n\n    // only process child layers if this layer is enabled\n    if (r.enabled) {\n        if (parent) {\n            parent.addLayer(r);\n        }\n\n        if (!empty) {\n            for (let key in nonWhiteListed) {\n                let property = nonWhiteListed[key];\n                if (typeof property === 'object' && !Array.isArray(property)) {\n                    parseLayerTree(key, property, r, styles);\n                } else {\n                    // Invalid layer\n                    let msg = `Layer value must be an object: cannot create layer '${key}: ${JSON.stringify(property)}'`;\n                    msg += `, under parent layer '${r.full_name}'.`;\n\n                    // If the parent is a style name, this may be an incorrectly nested layer\n                    if (styles[r.name]) {\n                        msg += ` The parent name '${r.name}' is also the name of a style, did you mean to create a 'draw' group`;\n                        if (parent) {\n                            msg += ` under '${parent.name}'`;\n                        }\n                        msg += ` instead?`;\n                    }\n                    log('warn', msg); // TODO: fire external event that clients to subscribe to\n                }\n            }\n        }\n    }\n\n    return r;\n}\n\n\nexport function parseLayers (layers, styles) {\n    let layer_trees = {};\n\n    for (let key in layers) {\n        let layer = layers[key];\n        if (layer) {\n            layer_trees[key] = parseLayerTree(key, layer, null, styles);\n        }\n    }\n\n    return layer_trees;\n}\n\nexport function matchFeature(context, layers, collected_layers, collected_layers_ids) {\n    let matched = false;\n    let childMatched = false;\n\n    if (layers.length === 0) { return; }\n\n    for (let r=0; r < layers.length; r++) {\n        let current = layers[r];\n\n        if (current.is_leaf) {\n            if (current.doesMatch(context)) {\n                matched = true;\n                collected_layers.push(current);\n                collected_layers_ids.push(current.id);\n            }\n\n        } else if (current.is_tree) {\n            if (current.doesMatch(context)) {\n                matched = true;\n\n                childMatched = matchFeature(\n                    context,\n                    current.layers,\n                    collected_layers,\n                    collected_layers_ids\n                );\n\n                if (!childMatched) {\n                    collected_layers.push(current);\n                    collected_layers_ids.push(current.id);\n                }\n            }\n        }\n    }\n\n    return matched;\n}\n",
+    "import {StyleParser} from './style_parser';\nimport Utils from '../utils/utils';\nimport log from '../utils/log';\nimport mergeObjects from '../utils/merge';\nimport {buildFilter} from './filter';\n\n// N.B.: 'visible' is legacy compatibility for 'enabled'\nexport const reserved = ['filter', 'draw', 'visible', 'enabled', 'data'];\n\nlet layer_cache = {};\nexport function layerCache () {\n    return layer_cache;\n}\n\nfunction cacheKey (layers) {\n    if (layers.length > 1) {\n        var k = layers[0];\n        for (var i=1; i < layers.length; i++) {\n            k += '/' + layers[i];\n        }\n\n        return k;\n    }\n    return layers[0];\n}\n\n// Merge matching layer trees into a final draw group\nexport function mergeTrees(matchingTrees, group) {\n    let draws, treeDepth = 0;\n\n    // Find deepest tree\n    for (let t=0; t < matchingTrees.length; t++) {\n        if (matchingTrees[t].length > treeDepth) {\n            treeDepth = matchingTrees[t].length;\n        }\n    }\n\n    // No layers to parse\n    if (treeDepth === 0) {\n        return null;\n    }\n\n    // Merged draw group object\n    let draw = {\n        visible: true, // visible by default\n    };\n\n    // Iterate trees in parallel\n    for (let x=0; x < treeDepth; x++) {\n        // Pull out the requested draw group, for each tree, at this depth\n        draws = matchingTrees.map(tree => tree[x] && tree[x][group]);\n        if (draws.length === 0) {\n            continue;\n        }\n\n        // Sort by layer name before merging, so layers are applied deterministically\n        // when multiple layers modify the same properties\n        draws.sort((a, b) => (a && a.layer_name) > (b && b.layer_name) ? 1 : -1);\n\n        // Merge draw objects\n        mergeObjects(draw, ...draws);\n\n        // Remove layer names, they were only used transiently to sort and calculate final layer\n        // (final merged names will not be accurate since only one tree can win)\n        delete draw.layer_name;\n    }\n\n    // Short-circuit if not visible\n    if (draw.visible === false) {\n        return null;\n    }\n\n    return draw;\n}\n\nconst blacklist = ['any', 'all', 'not', 'none'];\n\nclass Layer {\n\n    constructor({ layer, name, parent, draw, visible, enabled, filter, styles }) {\n        this.id = Layer.id++;\n        this.config_data = layer.data;\n        this.parent = parent;\n        this.name = name;\n        this.full_name = this.parent ? (this.parent.full_name + ':' + this.name) : this.name;\n        this.draw = draw;\n        this.filter = filter;\n        this.styles = styles;\n        this.is_built = false;\n\n        enabled = (enabled === undefined) ? visible : enabled; // `visible` property is backwards compatible for `enabled`\n        if (this.parent && this.parent.visible === false) {\n            this.enabled = false; // all descendants of disabled layer are also disabled\n        }\n        else {\n            this.enabled = (enabled !== false); // layer is enabled unless explicitly set to disabled\n        }\n\n        // Denormalize layer name to draw groups\n        if (this.draw) {\n            for (let group in this.draw) {\n                this.draw[group] = (this.draw[group] == null) ? {} : this.draw[group];\n                if (typeof this.draw[group] !== 'object') {\n                    // Invalid draw group\n                    let msg = `Draw group '${group}' for layer ${this.full_name} is invalid, must be an object, `;\n                    msg += `but was set to \\`${group}: ${this.draw[group]}\\` instead`;\n                    log('warn', msg); // TODO: fire external event that clients to subscribe to\n\n                    delete this.draw[group];\n                }\n                else {\n                    this.draw[group].layer_name = this.full_name;\n                }\n            }\n        }\n    }\n\n    build () {\n        log('trace', `Building layer '${this.full_name}'`);\n        this.buildFilter();\n        this.buildDraw();\n        this.is_built = true;\n    }\n\n    buildDraw() {\n        this.draw = Utils.stringsToFunctions(this.draw, StyleParser.wrapFunction);\n        this.calculatedDraw = calculateDraw(this);\n    }\n\n    buildFilter() {\n        this.filter_original = this.filter;\n        this.filter = Utils.stringsToFunctions(this.filter, StyleParser.wrapFunction);\n\n        let type = typeof this.filter;\n        if (this.filter != null && type !== 'object' && type !== 'function') {\n            // Invalid filter\n            let msg = `Filter for layer ${this.full_name} is invalid, filter value must be an object or function, `;\n            msg += `but was set to \\`filter: ${this.filter}\\` instead`;\n            log('warn', msg); // TODO: fire external event that clients to subscribe to\n            return;\n        }\n\n        try {\n            this.buildZooms();\n            this.buildPropMatches();\n            if (this.filter != null && (typeof this.filter === 'function' || Object.keys(this.filter).length > 0)) {\n                this.filter = buildFilter(this.filter, FilterOptions);\n            }\n            else {\n                this.filter = null;\n            }\n        }\n        catch(e) {\n            // Invalid filter\n            let msg = `Filter for layer ${this.full_name} is invalid, \\`filter: ${JSON.stringify(this.filter)}\\` `;\n            msg += `failed with error '${e.message}', stack trace: ${e.stack}`;\n            log('warn', msg); // TODO: fire external event that clients to subscribe to\n        }\n    }\n\n    // Zooms often cull large swaths of the layer tree, so they get special treatment and are checked first\n    buildZooms() {\n        let zoom = this.filter && this.filter.$zoom;\n        let ztype = typeof zoom;\n        if (zoom != null && ztype !== 'function') { // don't accelerate function-based filters\n            this.zooms = {};\n\n            if (ztype === 'number') {\n                this.zooms[zoom] = true;\n            }\n            else if (Array.isArray(zoom)) {\n                for (let z=0; z < zoom.length; z++) {\n                    this.zooms[zoom[z]] = true;\n                }\n            }\n            else if (ztype === 'object' && (zoom.min != null || zoom.max != null)) {\n                let zmin = zoom.min || 0;\n                let zmax = zoom.max || 25; // TODO: replace constant for max possible zoom\n                for (let z=zmin; z < zmax; z++) {\n                    this.zooms[z] = true;\n                }\n            }\n\n            delete this.filter.$zoom; // don't process zoom through usual generic filter logic\n        }\n    }\n\n    buildPropMatches() {\n        if (!this.filter || Array.isArray(this.filter) || typeof this.filter === 'function') {\n            return;\n        }\n\n        Object.keys(this.filter).forEach(key => {\n            if (blacklist.indexOf(key) === -1) {\n                let val = this.filter[key];\n                let type = typeof val;\n                let array = Array.isArray(val);\n\n                if (!(array || type === 'string' || type === 'number')) {\n                    return;\n                }\n\n                if (key[0] === '$') {\n                    // Context property\n                    this.context_prop_matches = this.context_prop_matches || [];\n                    this.context_prop_matches.push([key.substring(1), array ? val : [val]]);\n                }\n                else {\n                    // Feature property\n                    this.feature_prop_matches = this.feature_prop_matches || [];\n                    this.feature_prop_matches.push([key, array ? val : [val]]);\n                }\n\n                delete this.filter[key];\n            }\n        });\n    }\n\n    doPropMatches (context) {\n        if (this.feature_prop_matches) {\n            for (let r=0; r < this.feature_prop_matches.length; r++) {\n                let match = this.feature_prop_matches[r];\n                let val = context.feature.properties[match[0]];\n                if (val == null || match[1].indexOf(val) === -1) {\n                    return false;\n                }\n            }\n        }\n\n        if (this.context_prop_matches) {\n            for (let r=0; r < this.context_prop_matches.length; r++) {\n                let match = this.context_prop_matches[r];\n                let val = context[match[0]];\n                if (val == null || match[1].indexOf(val) === -1) {\n                    return false;\n                }\n            }\n        }\n\n        return true;\n    }\n\n    doesMatch (context) {\n        if (!this.enabled) {\n            return false;\n        }\n\n        if (!this.is_built) {\n            this.build();\n        }\n\n        // zoom pre-filter: skip rest of filter if out of layer zoom range\n        if (this.zooms != null && !this.zooms[context.zoom]) {\n            return false;\n        }\n\n        // direct feature property matches\n        if (!this.doPropMatches(context)) {\n            return false;\n        }\n\n        // any remaining filter (more complex matches or dynamic function)\n        let match;\n        if (this.filter instanceof Function){\n            try {\n                match = this.filter(context);\n            }\n            catch (error) {\n                // Filter function error\n                let msg = `Filter for this ${this.full_name}: \\`filter: ${this.filter_original}\\` `;\n                msg += `failed with error '${error.message}', stack trace: ${error.stack}`;\n                log('error', msg, context.feature);\n            }\n        }\n        else {\n            match = this.filter == null;\n        }\n\n        if (match) {\n            if (this.children_to_parse) {\n                parseLayerChildren(this, this.children_to_parse, this.styles);\n                delete this.children_to_parse;\n            }\n\n            return true;\n        }\n        return false;\n    }\n\n}\n\nLayer.id = 0;\n\n\nexport class LayerLeaf extends Layer {\n    constructor (config) {\n        super(config);\n        this.is_leaf = true;\n    }\n\n}\n\nexport class LayerTree extends Layer {\n    constructor (config) {\n        super(config);\n        this.is_tree = true;\n        this.layers = config.layers || [];\n    }\n\n    addLayer (layer) {\n        this.layers.push(layer);\n    }\n\n    buildDrawGroups (context) {\n        let layers = [], layer_ids = [];\n        matchFeature(context, [this], layers, layer_ids);\n\n        if (layers.length > 0) {\n            let cache_key = cacheKey(layer_ids);\n\n            // Only evaluate each layer combination once (undefined means not yet evaluated,\n            // null means evaluated with no draw object)\n            if (layer_cache[cache_key] === undefined) {\n                // Find all the unique visible draw blocks for this layer tree\n                let draw_groups = layers.map(x => x && x.visible !== false && x.calculatedDraw);\n                let draw_keys = {};\n\n                for (let r=0; r < draw_groups.length; r++) {\n                    let stack = draw_groups[r];\n                    if (!stack) {\n                        continue;\n                    }\n                    for (let g=0; g < stack.length; g++) {\n                        let group = stack[g];\n                        for (let key in group) {\n                            draw_keys[key] = true;\n                        }\n                    }\n                }\n\n                // Calculate each draw group\n                for (let draw_key in draw_keys) {\n                    layer_cache[cache_key] = layer_cache[cache_key] || {};\n                    layer_cache[cache_key][draw_key] = mergeTrees(draw_groups, draw_key);\n\n                    // Only save the ones that weren't null\n                    if (!layer_cache[cache_key][draw_key]) {\n                        delete layer_cache[cache_key][draw_key];\n                    }\n                    else {\n                        layer_cache[cache_key][draw_key].key = cache_key + '/' + draw_key;\n                        layer_cache[cache_key][draw_key].layers = layers.map(x => x && x.full_name);\n                        layer_cache[cache_key][draw_key].group = draw_key;\n                    }\n                }\n\n                // No layers evaluated\n                if (layer_cache[cache_key] && Object.keys(layer_cache[cache_key]).length === 0) {\n                    layer_cache[cache_key] = null;\n                }\n            }\n            return layer_cache[cache_key];\n        }\n    }\n\n}\n\nconst FilterOptions = {\n    // Handle unit conversions on filter ranges\n    rangeTransform(val) {\n        if (typeof val === 'string' && val.trim().slice(-3) === 'px2') {\n            return `${parseFloat(val)} * context.meters_per_pixel_sq`;\n        }\n        return val;\n    }\n};\n\nfunction isReserved(key) {\n    return reserved.indexOf(key) > -1;\n}\n\nfunction isEmpty(obj) {\n    return Object.keys(obj).length === 0;\n}\n\nexport function groupProps(obj) {\n    let reserved = {}, children = {};\n\n    for (let key in obj) {\n        if (isReserved(key)) {\n            reserved[key] = obj[key];\n        } else {\n            children[key] = obj[key];\n        }\n    }\n    return [reserved, children];\n}\n\nexport function calculateDraw(layer) {\n\n    let draw  = [];\n\n    if (layer.parent) {\n        let cs = layer.parent.calculatedDraw || [];\n        draw.push(...cs);\n    }\n\n    draw.push(layer.draw);\n    return draw;\n}\n\nexport function parseLayerNode(name, layer, parent, styles) {\n\n    layer = (layer == null) ? {} : layer;\n\n    let properties = { name, layer, parent, styles };\n    let [reserved, children] = groupProps(layer);\n    let empty = isEmpty(children);\n    let Create;\n\n    if (empty && parent != null) {\n        Create = LayerLeaf;\n    } else {\n        Create = LayerTree;\n    }\n\n    let r = new Create(Object.assign(properties, reserved));\n\n    // only process child layers if this layer is enabled\n    if (r.enabled) {\n        if (parent) {\n            parent.addLayer(r);\n        }\n        r.children_to_parse = empty ? null : children;\n    }\n\n    return r;\n}\n\nfunction parseLayerChildren (parent, children, styles) {\n    for (let key in children) {\n        let child = children[key];\n        if (typeof child === 'object' && !Array.isArray(child)) {\n            parseLayerNode(key, child, parent, styles);\n        } else {\n            // Invalid layer\n            let msg = `Layer value must be an object: cannot create layer '${key}: ${JSON.stringify(child)}'`;\n            msg += `, under parent layer '${parent.full_name}'.`;\n\n            // If the parent is a style name, this may be an incorrectly nested layer\n            if (styles[parent.name]) {\n                msg += ` The parent name '${parent.name}' is also the name of a style, did you mean to create a 'draw' group`;\n                if (parent.parent) {\n                    msg += ` under '${parent.parent.name}'`;\n                }\n                msg += ` instead?`;\n            }\n            log('warn', msg); // TODO: fire external event that clients to subscribe to\n        }\n    }\n}\n\n\nexport function parseLayers (layers, styles) {\n    layer_cache = {}; // clear layer cache\n    let layer_trees = {};\n\n    for (let key in layers) {\n        let layer = layers[key];\n        if (layer) {\n            layer_trees[key] = parseLayerNode(key, layer, null, styles);\n        }\n    }\n\n    return layer_trees;\n}\n\nexport function matchFeature(context, layers, collected_layers, collected_layers_ids) {\n    let matched = false;\n    let childMatched = false;\n\n    if (layers.length === 0) { return; }\n\n    for (let r=0; r < layers.length; r++) {\n        let current = layers[r];\n\n        if (current.is_leaf) {\n            if (current.doesMatch(context)) {\n                matched = true;\n                collected_layers.push(current);\n                collected_layers_ids.push(current.id);\n            }\n\n        } else if (current.is_tree) {\n            if (current.doesMatch(context)) {\n                matched = true;\n\n                childMatched = matchFeature(\n                    context,\n                    current.layers,\n                    collected_layers,\n                    collected_layers_ids\n                );\n\n                if (!childMatched) {\n                    collected_layers.push(current);\n                    collected_layers_ids.push(current.id);\n                }\n            }\n        }\n    }\n\n    return matched;\n}\n",
     "// Renders an array specifying a line pattern of alternating dashes and spaces,\n// similar to an SVG `dasharray` or Canvas setLineDash(), into a byte array of RGBA pixels\n// Returns:\n// {\n//    pixel: rendered image in Uint8Array buffer\n//    length: pixel length of rendered dash pattern (sum of all dashes and spaces)\n// }\n//\n// https://www.w3.org/TR/SVG/painting.html#StrokeDasharrayProperty\n// https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-dasharray\n// https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash\n\nconst default_dash_color = [255, 255, 255, 255];\nconst default_background_color = [0, 0, 0, 0];\n\nexport default function renderDashArray (pattern, options = {}) {\n    const dash_pixel = options.dash_color || default_dash_color;\n    const background_color = options.background_color || default_background_color;\n    const dashes = pattern;\n    const scale = options.scale || 1;\n\n    // If pattern is odd, repeat it to make it even (see SVG spec)\n    if (dashes.length % 2 === 1) {\n        Array.prototype.push.apply(dashes, dashes);\n    }\n\n    let dash = true;\n    let pixels = [];\n    for (let i=0; i < dashes.length; i++) {\n        let segment = Math.floor(dashes[i] * scale);\n        for (let s=0; s < segment; s++) {\n            Array.prototype.push.apply(pixels, dash ? dash_pixel : background_color);\n        }\n        dash = !dash; // alternate between dashes and spaces\n    }\n\n    pixels = new Uint8Array(pixels); // convert to typed array\n    const length = pixels.length / 4; // one RGBA byte sequences to one pixel\n\n    return { pixels, length };\n}\n",
     "// Line rendering style\n\nimport {Style} from '../style';\nimport {StyleParser} from '../style_parser';\nimport gl from '../../gl/constants'; // web workers don't have access to GL context, so import all GL constants\nimport Texture from '../../gl/texture';\nimport VertexLayout from '../../gl/vertex_layout';\nimport {buildPolylines} from '../../builders/polylines';\nimport renderDashArray from './dasharray';\nimport Geo from '../../geo';\nimport {shaderSrc_polygonsVertex, shaderSrc_polygonsFragment} from '../polygons/polygons';\n\nexport var Lines = Object.create(Style);\n\nObject.assign(Lines, {\n    name: 'lines',\n    built_in: true,\n    vertex_shader_src: shaderSrc_polygonsVertex,\n    fragment_shader_src: shaderSrc_polygonsFragment,\n    selection: true, // turn feature selection on\n\n    init() {\n        Style.init.apply(this, arguments);\n\n        // Basic attributes, others can be added (see texture UVs below)\n        var attribs = [\n            { name: 'a_position', size: 4, type: gl.SHORT, normalized: false },\n            { name: 'a_extrude', size: 4, type: gl.SHORT, normalized: false },\n            { name: 'a_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true }\n        ];\n\n        // Tell the shader we want a order in vertex attributes, and to extrude lines\n        this.defines.TANGRAM_LAYER_ORDER = true;\n        this.defines.TANGRAM_EXTRUDE_LINES = true;\n\n        // Optional feature selection\n        if (this.selection) {\n            attribs.push({ name: 'a_selection_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true });\n        }\n\n        // Optional line texture or dash array\n        // (latter will be rendered at compile-time, when GL context available)\n        if (this.texture || this.dash) {\n            this.texcoords = true;\n        }\n\n        // Optional texture UVs\n        if (this.texcoords) {\n            this.defines.TANGRAM_TEXTURE_COORDS = true;\n\n            // Scaling factor to add precision to line texture V coordinate packed as normalized short\n            this.defines.TANGRAM_DASH_SCALE = 1;\n            this.defines.TANGRAM_V_SCALE_ADJUST = Geo.tile_scale * this.defines.TANGRAM_DASH_SCALE;\n\n            // Add vertex attribute for UVs only when needed\n            attribs.push({ name: 'a_texcoord', size: 2, type: gl.UNSIGNED_SHORT, normalized: true });\n        }\n\n        this.vertex_layout = new VertexLayout(attribs);\n\n        // Additional single-allocated object used for holding outline style as it is processed\n        // Separate from this.feature_style so that outline properties do not overwrite calculated\n        // inline properties (outline call is made *within* the inline call)\n        this.outline_feature_style = {};\n        this.inline_feature_style = this.feature_style; // save reference to main computed style object\n    },\n\n    // Override\n    compileSetup () {\n        if (!this.compile_setup) {\n            this.parseLineTexture();\n        }\n        return Style.compileSetup.apply(this, arguments);\n    },\n\n    // Optionally apply a dash array pattern to this line\n    parseLineTexture () {\n        // Specify a line pattern\n        if (this.dash) {\n            // Optional background color for dash pattern (defaults transparent)\n            if (this.dash_background_color) {\n                this.dash_background_color = StyleParser.parseColor(this.dash_background_color);\n                this.defines.TANGRAM_LINE_BACKGROUND_COLOR =\n                    `vec3(${this.dash_background_color.slice(0, 3).join(', ')})`;\n            }\n\n            // Adjust texcoord scale to allow for dash patterns that are a fraction of line width\n            this.defines.TANGRAM_DASH_SCALE = 20;\n            this.defines.TANGRAM_V_SCALE_ADJUST = Geo.tile_scale * this.defines.TANGRAM_DASH_SCALE;\n\n            // Render line pattern\n            const dash = renderDashArray(this.dash, { scale: this.defines.TANGRAM_DASH_SCALE });\n            this.texture = '_' + this.name + '_dasharray';\n            Texture.create(this.gl, this.texture, {\n                data: dash.pixels,\n                height: dash.length,\n                width: 1,\n                filtering: 'nearest'\n            });\n        }\n\n        // Specify a line texture (either directly, or rendered dash pattern from above)\n        if (this.texture) {\n            this.defines.TANGRAM_LINE_TEXTURE = true;\n            this.defines.TANGRAM_ALPHA_TEST = 0.5; // pixels below this threshold are transparent\n            this.shaders.uniforms = this.shaders.uniforms || {};\n            this.shaders.uniforms.u_texture = this.texture;\n            this.shaders.uniforms.u_texture_ratio = 1;\n\n            // update line pattern aspect ratio after texture loads\n            Texture.getInfo(this.texture).then(texture => {\n                if (texture) {\n                    this.shaders.uniforms.u_texture_ratio = texture.height / texture.width;\n                }\n            });\n        }\n    },\n\n    // Calculate width at zoom given in `context`\n    calcWidth (width, context) {\n        return (width && StyleParser.evalCachedDistanceProperty(width, context)) || 0;\n    },\n\n    // Calculate width at next zoom (used for line width interpolation)\n    calcWidthNextZoom (width, context) {\n        context.zoom++;\n        let val = this.calcWidth(width, context);\n        context.zoom--;\n        return val;\n    },\n\n    _parseFeature (feature, draw, context) {\n        var style = this.feature_style;\n\n        // line width in meters\n        let width = this.calcWidth(draw.width, context);\n        if (width < 0) {\n            return; // skip lines with negative width\n        }\n        let next_width = this.calcWidthNextZoom(draw.next_width, context);\n\n        if ((width === 0 && next_width === 0) || next_width < 0) {\n            return; // skip lines that don't interpolate to a positive value at next zoom\n        }\n\n        // convert to units and relative change from previous zoom\n        // NB: multiply by 2 because a given width is twice as big in screen space at the next zoom\n        style.width = width * context.units_per_meter_overzoom;\n        style.next_width = (next_width * 2) - width;\n        style.next_width *= context.units_per_meter_overzoom;\n        style.next_width /= 2; // NB: divide by 2 because extrusion width is halved in builder - remove?\n\n        style.color = this.parseColor(draw.color, context);\n        if (!style.color) {\n            return;\n        }\n\n        // height defaults to feature height, but extrude style can dynamically adjust height by returning a number or array (instead of a boolean)\n        style.z = (draw.z && StyleParser.evalCachedDistanceProperty(draw.z || 0, context)) || StyleParser.defaults.z;\n        style.height = feature.properties.height || StyleParser.defaults.height;\n        style.extrude = StyleParser.evalProperty(draw.extrude, context);\n        if (style.extrude) {\n            if (typeof style.extrude === 'number') {\n                style.height = style.extrude;\n            }\n            else if (Array.isArray(style.extrude)) {\n                style.height = style.extrude[1];\n            }\n        }\n\n        // Raise line height if extruded\n        if (style.extrude && style.height) {\n            style.z += style.height;\n        }\n\n        style.z *= Geo.height_scale;        // provide sub-meter precision of height values\n        style.height *= Geo.height_scale;\n\n        style.cap = draw.cap;\n        style.join = draw.join;\n        style.miter_limit = draw.miter_limit;\n        style.tile_edges = draw.tile_edges; // usually activated for debugging, or rare visualization needs\n\n        // Construct an outline style\n        // Reusable outline style object, marked as already wrapped in cache objects (preprocessed = true)\n        style.outline = style.outline || { width: {}, next_width: {}, preprocessed: true };\n\n        if (draw.outline && draw.outline.visible !== false && draw.outline.color && draw.outline.width) {\n            // outline width in meters\n            // NB: multiply by 2 because outline is applied on both sides of line\n            let outline_width = this.calcWidth(draw.outline.width, context) * 2;\n            let outline_next_width = this.calcWidthNextZoom(draw.outline.next_width, context) * 2;\n\n            if ((outline_width === 0 && outline_next_width === 0) || outline_width < 0 || outline_next_width < 0) {\n                // skip lines that don't interpolate between zero or greater width\n                style.outline.width.value = null;\n                style.outline.next_width.value = null;\n                style.outline.color = null;\n            }\n            else {\n                // Maintain consistent outline width around the line fill\n                style.outline.width.value = outline_width + width;\n                style.outline.next_width.value = outline_next_width + next_width;\n\n                style.outline.color = draw.outline.color;\n                style.outline.cap = draw.outline.cap || draw.cap;\n                style.outline.join = draw.outline.join || draw.join;\n                style.outline.miter_limit = draw.outline.miter_limit || draw.miter_limit;\n                style.outline.style = draw.outline.style || this.name;\n\n                // Explicitly defined outline order, or inherited from inner line\n                if (draw.outline.order) {\n                    style.outline.order = this.parseOrder(draw.outline.order, context);\n                }\n                else {\n                    style.outline.order = style.order;\n                }\n\n                // Don't let outline be above inner line\n                if (style.outline.order > style.order) {\n                    style.outline.order = style.order;\n                }\n\n                // Outlines are always at half-layer intervals to avoid conflicting with inner lines\n                style.outline.order -= 0.5;\n            }\n        }\n        else {\n            style.outline.width.value = null;\n            style.outline.next_width.value = null;\n            style.outline.color = null;\n        }\n\n        return style;\n    },\n\n    _preprocess (draw) {\n        draw.color = StyleParser.createColorPropertyCache(draw.color);\n        draw.width = StyleParser.createPropertyCache(draw.width, StyleParser.parseUnits);\n        draw.next_width = StyleParser.createPropertyCache(draw.width, StyleParser.parseUnits); // width will be computed for next zoom\n        draw.z = StyleParser.createPropertyCache(draw.z, StyleParser.parseUnits);\n\n        if (draw.outline) {\n            draw.outline.color = StyleParser.createColorPropertyCache(draw.outline.color);\n            draw.outline.width = StyleParser.createPropertyCache(draw.outline.width, StyleParser.parseUnits);\n            draw.outline.next_width = StyleParser.createPropertyCache(draw.outline.width, StyleParser.parseUnits); // width re-computed for next zoom\n        }\n        return draw;\n    },\n\n    /**\n     * A \"template\" that sets constant attibutes for each vertex, which is then modified per vertex or per feature.\n     * A plain JS array matching the order of the vertex layout.\n     */\n    makeVertexTemplate(style) {\n        let i = 0;\n\n        // position - x & y coords will be filled in per-vertex below\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = style.z || 0;\n\n        // layer order - w coord of 'position' attribute (for packing efficiency)\n        this.vertex_template[i++] = this.scaleOrder(style.order);\n\n        // extrusion vector\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = 0;\n\n        // scaling to previous and next zoom\n        this.vertex_template[i++] = style.next_width;\n\n        // color\n        this.vertex_template[i++] = style.color[0] * 255;\n        this.vertex_template[i++] = style.color[1] * 255;\n        this.vertex_template[i++] = style.color[2] * 255;\n        this.vertex_template[i++] = style.color[3] * 255;\n\n        // selection color\n        if (this.selection) {\n            this.vertex_template[i++] = style.selection_color[0] * 255;\n            this.vertex_template[i++] = style.selection_color[1] * 255;\n            this.vertex_template[i++] = style.selection_color[2] * 255;\n            this.vertex_template[i++] = style.selection_color[3] * 255;\n        }\n\n        // Add texture UVs to template only if needed\n        if (this.texcoords) {\n            this.vertex_template[i++] = 0;\n            this.vertex_template[i++] = 0;\n        }\n\n        return this.vertex_template;\n    },\n\n    buildLines(lines, style, vertex_data, context, options) {\n        // Outline (build first so that blended geometry without a depth test is drawn first/under the inner line)\n        this.feature_style = this.outline_feature_style; // swap in outline-specific style holder\n        if (style.outline && style.outline.color != null && style.outline.width.value != null) {\n            var outline_style = this.styles[style.outline.style];\n            if (outline_style) {\n                outline_style.addFeature(context.feature, style.outline, context);\n            }\n        }\n\n        // Main line\n        this.feature_style = this.inline_feature_style; // restore calculated style for inline\n        let vertex_template = this.makeVertexTemplate(style);\n        buildPolylines(\n            lines,\n            style.width,\n            vertex_data,\n            vertex_template,\n            {\n                cap: style.cap,\n                join: style.join,\n                miter_limit: style.miter_limit,\n                scaling_index: this.vertex_layout.index.a_extrude,\n                scaling_normalize: 256, // values have an 8-bit fraction\n                texcoord_index: this.vertex_layout.index.a_texcoord,\n                texcoord_width: (style.width || style.next_width) / context.tile.overzoom2, // UVs can't calc for zero-width, use next zoom width in that case\n                texcoord_normalize: 65535, // scale UVs to unsigned shorts\n                closed_polygon: options && options.closed_polygon,\n                remove_tile_edges: !style.tile_edges && options && options.remove_tile_edges,\n                tile_edge_tolerance: Geo.tile_scale * context.tile.pad_scale * 2\n            }\n        );\n    },\n\n    buildPolygons(polygons, style, vertex_data, context) {\n        // Render polygons as individual lines\n        for (let p=0; p < polygons.length; p++) {\n            this.buildLines(polygons[p], style, vertex_data, context, { closed_polygon: true, remove_tile_edges: true });\n        }\n    }\n\n});\n",
     "// Point + text label rendering style\n\nimport log from '../../utils/log';\nimport {Style} from '../style';\nimport {StyleParser} from '../style_parser';\nimport gl from '../../gl/constants'; // web workers don't have access to GL context, so import all GL constants\nimport VertexLayout from '../../gl/vertex_layout';\nimport {buildQuadsForPoints} from '../../builders/points';\nimport Texture from '../../gl/texture';\nimport Geo from '../../geo';\nimport Vector from '../../vector';\nimport Collision from '../../labels/collision';\nimport LabelPoint from '../../labels/label_point';\nimport placePointsOnLine from '../../labels/point_placement';\nimport {TextLabels} from '../text/text_labels';\nimport {VIEW_PAN_SNAP_TIME} from '../../view';\nimport debugSettings from '../../utils/debug_settings';\n\nlet fs = require('fs');\nconst shaderSrc_pointsVertex = fs.readFileSync(__dirname + '/points_vertex.glsl', 'utf8');\nconst shaderSrc_pointsFragment = fs.readFileSync(__dirname + '/points_fragment.glsl', 'utf8');\n\nconst PLACEMENT = LabelPoint.PLACEMENT;\n\nconst pre_angles_normalize = 128 / Math.PI;\nconst angles_normalize = 16384 / Math.PI;\nconst offsets_normalize = 64;\nconst texcoord_normalize = 65535;\n\nexport var Points = Object.create(Style);\n\n// Mixin text label methods\nObject.assign(Points, TextLabels);\n\nObject.assign(Points, {\n    name: 'points',\n    built_in: true,\n    collision: true,  // style includes a collision pass\n    blend: 'overlay', // overlays drawn on top of all other styles, with blending\n\n    init(options = {}, extra_attributes = []) {\n        Style.init.call(this, options);\n\n        // Base shaders\n        this.vertex_shader_src = shaderSrc_pointsVertex;\n        this.fragment_shader_src = shaderSrc_pointsFragment;\n\n        var attribs = [\n            { name: 'a_position', size: 4, type: gl.SHORT, normalized: false },\n            { name: 'a_shape', size: 4, type: gl.SHORT, normalized: false },\n            { name: 'a_texcoord', size: 2, type: gl.UNSIGNED_SHORT, normalized: true },\n            { name: 'a_offset', size: 2, type: gl.SHORT, normalized: false },\n            { name: 'a_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true }\n        ];\n\n        if (extra_attributes.length){\n            Array.prototype.push.apply(attribs, extra_attributes);\n        }\n\n        // Feature selection\n        this.selection = true;\n        attribs.push({ name: 'a_selection_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true });\n\n\n        // If we're not rendering as overlay, we need a layer attribute\n        if (this.blend !== 'overlay') {\n            this.defines.TANGRAM_LAYER_ORDER = true;\n        }\n\n        // ensure a label texture is always bound (avoid Chrome 'no texture bound to unit' warnings)\n        this.shaders.uniforms = this.shaders.uniforms || {};\n        this.shaders.uniforms.u_label_texture = Texture.default;\n\n        if (this.texture) {\n            this.defines.TANGRAM_TEXTURE_POINT = true;\n            this.shaders.uniforms.u_texture = this.texture;\n        }\n        else {\n            this.defines.TANGRAM_SHADER_POINT = true;\n            attribs.push({ name: 'a_outline_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true });\n            attribs.push({ name: 'a_outline_edge', size: 1, type: gl.FLOAT, normalized: false });\n        }\n\n        this.vertex_layout = new VertexLayout(attribs);\n\n        // Enable dual point/text mode\n        this.defines.TANGRAM_MULTI_SAMPLER = true;\n\n        // Fade out when tile is zooming out, e.g. acting as proxy tiles\n        this.defines.TANGRAM_FADE_ON_ZOOM_OUT = true;\n        this.defines.TANGRAM_FADE_ON_ZOOM_OUT_RATE = 2; // fade at 2x, e.g. fully transparent at 0.5 zoom level away\n\n        // Fade in (depending on tile proxy status)\n        if (debugSettings.suppress_label_fade_in === true) {\n            this.fade_in_time = 0;\n            this.defines.TANGRAM_FADE_IN_RATE = null;\n        }\n        else {\n            this.fade_in_time = 0.15; // time in seconds\n            this.defines.TANGRAM_FADE_IN_RATE = 1 / this.fade_in_time;\n        }\n\n        // Snap points to pixel grid after panning stop\n        if (debugSettings.suppress_label_snap_animation !== true) {\n            this.defines.TANGRAM_VIEW_PAN_SNAP_RATE = 1 / VIEW_PAN_SNAP_TIME; // inverse time in seconds\n        }\n\n        this.collision_group_points = this.name+'-points';\n        this.collision_group_text = this.name+'-text';\n\n        this.reset();\n    },\n\n    reset () {\n        this.queues = {};\n        this.resetText();\n        this.texture_missing_sprites = {}; // track which missing sprites we've found (reduce dupe log messages)\n    },\n\n    // Override to queue features instead of processing immediately\n    addFeature (feature, draw, context) {\n        let tile = context.tile;\n        if (tile.generation !== this.generation) {\n            return;\n        }\n\n        // Called here because otherwise it will be delayed until the feature queue is parsed,\n        // and we want the preprocessing done before we evaluate text style below\n        draw = this.preprocess(draw);\n        if (!draw) {\n            return;\n        }\n\n        // Point styling\n        let style = {};\n        style.color = this.parseColor(draw.color, context);\n\n        // require color or texture\n        if (!style.color && !this.texture) {\n            return;\n        }\n\n        // optional sprite\n        let sprite_info;\n        if (this.hasSprites()) {\n            sprite_info = this.parseSprite(draw, context);\n            if (sprite_info) {\n                style.texcoords = sprite_info.texcoords;\n            }\n            else {\n                return;\n            }\n        }\n\n        // point size defined explicitly, or defaults to sprite size, or generic fallback\n        style.size = draw.size;\n        if (!style.size) {\n            if (sprite_info) {\n                style.size = sprite_info.size;\n            }\n            else {\n                style.size = [16, 16];\n            }\n        }\n        else {\n            style.size = StyleParser.evalCachedProperty(style.size, context);\n            if (typeof style.size === 'number') {\n                style.size = [style.size, style.size]; // convert 1d size to 2d\n            }\n        }\n\n        // incorporate outline into size\n        if (draw.outline) {\n            style.outline_width = StyleParser.evalCachedProperty(draw.outline.width, context) || StyleParser.defaults.outline.width;\n            style.outline_color = this.parseColor(draw.outline.color, context);\n        }\n\n        style.outline_edge_pct = 0;\n        if (style.outline_width && style.outline_color) {\n            let outline_width = style.outline_width + 1;\n            style.size[0] += outline_width; // bump outline by 1px to balance out antialiasing\n            style.size[1] += outline_width;\n            style.outline_edge_pct = outline_width / Math.min(style.size[0], style.size[1]) * 2; // UV distance at which outline starts\n        }\n\n        // size will be scaled to 16-bit signed int, so max allowed width + height of 256 pixels\n        style.size = [\n            Math.min(style.size[0], 256),\n            Math.min(style.size[1], 256)\n        ];\n\n        // Placement strategy\n        style.placement = draw.placement;\n        style.placement_min_length_ratio = StyleParser.evalCachedProperty(draw.placement_min_length_ratio, context);\n\n        // Spacing parameter (in pixels) to equally space points along a line\n        if (style.placement === PLACEMENT.SPACED && draw.placement_spacing) {\n            style.placement_spacing = StyleParser.evalCachedProperty(draw.placement_spacing, context);\n        }\n\n        // Angle parameter (can be a number or the string \"auto\")\n        style.angle = StyleParser.evalProperty(draw.angle, context) || 0;\n\n        // points can be placed off the ground\n        style.z = (draw.z && StyleParser.evalCachedDistanceProperty(draw.z, context)) || StyleParser.defaults.z;\n\n        style.tile_edges = draw.tile_edges; // usually activated for debugging, or rare visualization needs\n\n        style.sampler = 0; // 0 = sprites\n\n        this.computeLayout(style, feature, draw, context, tile);\n\n        // Text styling\n        let tf =\n            draw.text &&\n            draw.text.visible !== false && // explicitly handle `visible` property for nested text\n            this.parseTextFeature(feature, draw.text, context, tile);\n\n        if (Array.isArray(tf)) {\n            tf = null; // NB: boundary labels not supported for point label attachments, should log warning\n            log({ level: 'warn', once: true }, `Layer '${draw.layers[draw.layers.length-1]}': ` +\n                `cannot use boundary labels (e.g. 'text_source: { left: ..., right: ... }') for 'text' labels attached to 'points'; ` +\n                `provided 'text_source' value was '${JSON.stringify(draw.text.text_source)}'`);\n        }\n\n        if (tf) {\n            tf.layout.parent = style; // parent point will apply additional anchor/offset to text\n\n            // Text labels have a default priority of 0.5 below their parent point (+0.5, priority is lower-is-better)\n            // This can be overriden, as long as it is less than or equal to the default\n            tf.layout.priority = draw.text.priority ? Math.max(tf.layout.priority, style.priority + 0.5) : (style.priority + 0.5);\n\n            // Text labels attached to points should not be moved into tile\n            // (they should stay fixed relative to the point)\n            tf.layout.move_into_tile = false;\n\n            Collision.addStyle(this.collision_group_text, tile.key);\n        }\n\n        this.queueFeature({ feature, draw, context, style, text_feature: tf }, tile); // queue the feature for later processing\n\n        // Register with collision manager\n        Collision.addStyle(this.collision_group_points, tile.key);\n    },\n\n    hasSprites() {\n        return this.texture && Texture.textures[this.texture] && Texture.textures[this.texture].sprites;\n    },\n\n    getSpriteInfo (sprite) {\n        let info = Texture.textures[this.texture].sprites[sprite] && Texture.getSpriteInfo(this.texture, sprite);\n        if (sprite && !info) {\n            if (!this.texture_missing_sprites[sprite]) { // only log each missing sprite once\n                log('debug', `Style: in style '${this.name}', could not find sprite '${sprite}' for texture '${this.texture}'`);\n                this.texture_missing_sprites[sprite] = true;\n            }\n        }\n        return info;\n    },\n\n    parseSprite (draw, context) {\n        let sprite = StyleParser.evalProperty(draw.sprite, context);\n        let sprite_info = this.getSpriteInfo(sprite) || this.getSpriteInfo(draw.sprite_default);\n        return sprite_info;\n    },\n\n    // Queue features for deferred processing (collect all features first so we can do collision on the whole group)\n    queueFeature (q, tile) {\n        if (!this.tile_data[tile.key] || !this.queues[tile.key]) {\n            this.startData(tile);\n        }\n        this.queues[tile.key].push(q);\n    },\n\n    // Override\n    startData (tile) {\n        this.queues[tile.key] = [];\n        return Style.startData.call(this, tile);\n    },\n\n    // Override\n    endData (tile) {\n        if (tile.canceled) {\n            log('trace', `Style ${this.name}: stop tile build because tile was canceled: ${tile.key}`);\n            return Promise.resolve();\n        }\n\n        let queue = this.queues[tile.key];\n        delete this.queues[tile.key];\n\n        // For each point feature, create one or more labels\n        let text_objs = [];\n        let point_objs = [];\n\n        queue.forEach(q => {\n            let style = q.style;\n            let feature = q.feature;\n            let geometry = feature.geometry;\n\n            let feature_labels = this.buildLabels(style.size, geometry, style);\n            for (let i = 0; i < feature_labels.length; i++) {\n                let label = feature_labels[i];\n                let point_obj = {\n                    feature,\n                    draw: q.draw,\n                    context: q.context,\n                    style,\n                    label\n                };\n                point_objs.push(point_obj);\n\n                if (q.text_feature) {\n                    let text_obj = {\n                        feature,\n                        draw: q.text_feature.draw,\n                        context: q.context,\n                        text: q.text_feature.text,\n                        text_settings_key: q.text_feature.text_settings_key,\n                        layout: q.text_feature.layout,\n                        point_label: label,\n                        linked: point_obj   // link so text only renders when parent point is placed\n                    };\n                    text_objs.push(text_obj);\n\n                    // Unless text feature is optional, create a two-way link so that parent\n                    // point will only render when text is also placed\n                    if (!q.draw.text.optional) {\n                        point_obj.linked = text_obj; // two-way link\n                    }\n                }\n            }\n        });\n\n        // Collide both points and text, then build features\n        return Promise.\n            all([\n                // Points\n                Collision.collide(point_objs, this.collision_group_points, tile.key).then(point_objs => {\n                    point_objs.forEach(q => {\n                        this.feature_style = q.style;\n                        this.feature_style.label = q.label;\n                        Style.addFeature.call(this, q.feature, q.draw, q.context);\n                    });\n                }),\n                // Labels\n                this.prepareTextLabels(tile, this.collision_group_text, text_objs).\n                    then(labels => this.collideAndRenderTextLabels(tile, this.collision_group_text, labels))\n            ]).then(([, { labels, texts, texture }]) => {\n                // Process labels\n                if (labels && texts) {\n                    // Build queued features\n                    labels.forEach(q => {\n                        let text_settings_key = q.text_settings_key;\n                        let text_info = texts[text_settings_key] && texts[text_settings_key][q.text];\n\n                        // setup styling object expected by Style class\n                        let style = this.feature_style;\n                        style.label = q.label;\n                        style.size = text_info.size.logical_size;\n                        style.angle = 0; // text attached to point is always upright\n                        style.texcoords = text_info.align[q.label.align].texcoords;\n                        style.sampler = 1; // non-0 = labels\n\n                        Style.addFeature.call(this, q.feature, q.draw, q.context);\n                    });\n                }\n                this.freeText(tile);\n\n                // Finish tile mesh\n                return Style.endData.call(this, tile).then(tile_data => {\n                    // Attach tile-specific label atlas to mesh as a texture uniform\n                    if (texture && tile_data) {\n                        tile_data.uniforms = tile_data.uniforms || {};\n                        tile_data.textures = tile_data.textures || [];\n\n                        tile_data.uniforms.u_label_texture = texture;\n                        tile_data.textures.push(texture); // assign texture ownership to tile\n                    }\n                    return tile_data;\n                });\n            });\n    },\n\n    _preprocess (draw) {\n        draw.color = StyleParser.createColorPropertyCache(draw.color);\n\n        if (draw.outline) {\n            draw.outline.color = StyleParser.createColorPropertyCache(draw.outline.color);\n            draw.outline.width = StyleParser.createPropertyCache(draw.outline.width, v => Array.isArray(v) ? v.map(parseFloat) : parseFloat(v));\n        }\n\n        draw.z = StyleParser.createPropertyCache(draw.z, StyleParser.parseUnits);\n\n        // Size (1d value or 2d array)\n        draw.size = StyleParser.createPropertyCache(draw.size, v => Array.isArray(v) ? v.map(parseFloat) : parseFloat(v));\n\n        // Offset (2d array)\n        draw.offset = StyleParser.createPropertyCache(draw.offset, v => (Array.isArray(v) && v.map(parseFloat)) || 0);\n\n        // Buffer (1d value or 2d array, expand 1d to 2d)\n        draw.buffer = StyleParser.createPropertyCache(draw.buffer, v => (Array.isArray(v) ? v : [v, v]).map(parseFloat) || 0);\n\n        // Repeat rules - no repeat limitation for points by default\n        draw.repeat_distance = StyleParser.createPropertyCache(draw.repeat_distance, parseFloat);\n\n        // Placement strategies\n        draw.placement = PLACEMENT[draw.placement && draw.placement.toUpperCase()];\n        if (draw.placement == null) {\n            draw.placement = PLACEMENT.VERTEX;\n        }\n\n        draw.placement_spacing = draw.placement_spacing != null ? draw.placement_spacing : 80; // default spacing\n        draw.placement_spacing = StyleParser.createPropertyCache(draw.placement_spacing, parseFloat);\n\n        draw.placement_min_length_ratio = draw.placement_min_length_ratio != null ? draw.placement_min_length_ratio : 1;\n        draw.placement_min_length_ratio = StyleParser.createPropertyCache(draw.placement_min_length_ratio, parseFloat);\n\n        if (typeof draw.angle === 'number') {\n            draw.angle = draw.angle * Math.PI / 180;\n        }\n        else {\n            draw.angle = draw.angle || 0; // angle can be a string like \"auto\" (use angle of geometry)\n        }\n\n        // Optional text styling\n        draw.text = this.preprocessText(draw.text); // will return null if valid text styling wasn't provided\n        if (draw.text) {\n            draw.text.key = draw.key; // copy layer key for use as label repeat group\n            draw.text.repeat_group = draw.text.repeat_group || draw.repeat_group; // inherit repeat group by default\n            draw.text.anchor = draw.text.anchor || this.default_anchor;\n            draw.text.optional = (typeof draw.text.optional === 'boolean') ? draw.text.optional : false; // default text to required\n            draw.text.interactive = draw.text.interactive || draw.interactive; // inherits from point\n        }\n\n        return draw;\n    },\n\n    // Default to trying all anchor placements\n    default_anchor: ['bottom', 'top', 'right', 'left'],\n\n    // Compute label layout-related properties\n    computeLayout (target, feature, draw, context, tile) {\n        let layout = target || {};\n        layout.id = feature;\n        layout.units_per_pixel = tile.units_per_pixel || 1;\n\n        // collision flag\n        layout.collide = (draw.collide === false) ? false : true;\n\n        // tile boundary handling\n        layout.cull_from_tile = (draw.cull_from_tile != null) ? draw.cull_from_tile : false;\n\n        // points should not move into tile if over tile boundary\n        layout.move_into_tile = false;\n\n        // label anchors (point labels only)\n        // label position will be adjusted in the given direction, relative to its original point\n        // one of: left, right, top, bottom, top-left, top-right, bottom-left, bottom-right\n        layout.anchor = draw.anchor;\n\n        // label offset and buffer in pixel (applied in screen space)\n        layout.offset = StyleParser.evalCachedProperty(draw.offset, context) || StyleParser.zeroPair;\n        layout.buffer = StyleParser.evalCachedProperty(draw.buffer, context) || StyleParser.zeroPair;\n\n        // repeat rules\n        layout.repeat_distance = StyleParser.evalCachedProperty(draw.repeat_distance, context);\n        if (layout.repeat_distance) {\n            layout.repeat_distance *= layout.units_per_pixel;\n\n            if (typeof draw.repeat_group === 'function') {\n                layout.repeat_group = draw.repeat_group(context);\n            }\n            else if (typeof draw.repeat_group === 'string') {\n                layout.repeat_group = draw.repeat_group;\n            }\n            else {\n                layout.repeat_group = draw.key; // default to unique set of matching layers\n            }\n        }\n\n        // label priority (lower is higher)\n        let priority = draw.priority;\n        if (priority != null) {\n            if (typeof priority === 'function') {\n                priority = priority(context);\n            }\n        }\n        else {\n            priority = -1 >>> 0; // default to max priority value if none set\n        }\n        layout.priority = priority;\n\n        return layout;\n    },\n\n    // Implements label building for TextLabels mixin\n    buildTextLabels (tile_key, feature_queue) {\n        let labels = [];\n        for (let f=0; f < feature_queue.length; f++) {\n            let fq = feature_queue[f];\n            let text_info = this.texts[tile_key][fq.text_settings_key][fq.text];\n            let size = text_info.size.collision_size;\n            fq.label = new LabelPoint(fq.point_label.position, size, fq.layout);\n            labels.push(fq);\n        }\n        return labels;\n    },\n\n    // Builds one or more point labels for a geometry\n    buildLabels (size, geometry, options) {\n        let labels = [];\n\n        if (geometry.type === \"Point\") {\n            labels.push(new LabelPoint(geometry.coordinates, size, options));\n        }\n        else if (geometry.type === \"MultiPoint\") {\n            let points = geometry.coordinates;\n            for (let i = 0; i < points.length; ++i) {\n                let point = points[i];\n                labels.push(new LabelPoint(point, size, options));\n            }\n        }\n        else if (geometry.type === \"LineString\") {\n            let line = geometry.coordinates;\n            let point_labels = placePointsOnLine(line, size, options);\n            for (let i = 0; i < point_labels.length; ++i) {\n                labels.push(point_labels[i]);\n            }\n        }\n        else if (geometry.type === \"MultiLineString\") {\n            let lines = geometry.coordinates;\n            for (let ln = 0; ln < lines.length; ln++) {\n                let line = lines[ln];\n                let point_labels = placePointsOnLine(line, size, options);\n                for (let i = 0; i < point_labels.length; ++i) {\n                    labels.push(point_labels[i]);\n                }\n            }\n        }\n        else if (geometry.type === \"Polygon\") {\n            // Point at polygon centroid (of outer ring)\n            if (options.placement === PLACEMENT.CENTROID) {\n                let centroid = Geo.centroid(geometry.coordinates);\n                labels.push(new LabelPoint(centroid, size, options));\n            }\n            // Point at each polygon vertex (all rings)\n            else {\n                let rings = geometry.coordinates;\n                for (let ln = 0; ln < rings.length; ln++) {\n                    let point_labels = placePointsOnLine(rings[ln], size, options);\n                    for (let i = 0; i < point_labels.length; ++i) {\n                        labels.push(point_labels[i]);\n                    }\n                }\n            }\n        }\n        else if (geometry.type === \"MultiPolygon\") {\n            if (options.placement === PLACEMENT.CENTROID) {\n                let centroid = Geo.multiCentroid(geometry.coordinates);\n                labels.push(new LabelPoint(centroid, size, options));\n            }\n            else {\n                let polys = geometry.coordinates;\n                for (let p = 0; p < polys.length; p++) {\n                    let rings = polys[p];\n                    for (let ln = 0; ln < rings.length; ln++) {\n                        let point_labels = placePointsOnLine(rings[ln], size, options);\n                        for (let i = 0; i < point_labels.length; ++i) {\n                            labels.push(point_labels[i]);\n                        }\n                    }\n                }\n            }\n        }\n\n        return labels;\n    },\n\n    /**\n     * A \"template\" that sets constant attibutes for each vertex, which is then modified per vertex or per feature.\n     * A plain JS array matching the order of the vertex layout.\n     */\n    makeVertexTemplate(style) {\n        let color = style.color || StyleParser.defaults.color;\n\n        // position - x & y coords will be filled in per-vertex below\n        this.fillVertexTemplate('a_position', 0, { size: 2 });\n        this.fillVertexTemplate('a_position', style.z || 0, { size: 1, offset: 2 });\n        // layer order - w coord of 'position' attribute (for packing efficiency)\n        this.fillVertexTemplate('a_position', this.scaleOrder(style.order), { size: 1, offset: 3 });\n\n        // scaling vector - (x, y) components per pixel, z = angle, w = scaling factor\n        this.fillVertexTemplate('a_shape', 0, { size: 4 });\n\n        // texture coords\n        this.fillVertexTemplate('a_texcoord', 0, { size: 2 });\n\n        // offsets\n        this.fillVertexTemplate('a_offset', 0, { size: 2 });\n\n        // color\n        this.fillVertexTemplate('a_color', Vector.mult(color, 255), { size: 4 });\n\n        // outline\n        if (this.defines.TANGRAM_SHADER_POINT) {\n            let outline_color = style.outline_color || StyleParser.defaults.outline.color;\n            this.fillVertexTemplate('a_outline_color', Vector.mult(outline_color, 255), { size: 4 });\n            this.fillVertexTemplate('a_outline_edge', style.outline_edge_pct || StyleParser.defaults.outline.width, { size: 1 });\n        }\n\n        // selection color\n        if (this.selection) {\n            this.fillVertexTemplate('a_selection_color', Vector.mult(style.selection_color, 255), { size: 4 });\n        }\n\n        return this.vertex_template;\n    },\n\n    buildQuad(points, size, angle, angles, pre_angles, sampler, offset, offsets, texcoord_scale, curve, vertex_data, vertex_template) {\n        buildQuadsForPoints(\n            points,\n            vertex_data,\n            vertex_template,\n            {\n                texcoord_index: this.vertex_layout.index.a_texcoord,\n                position_index: this.vertex_layout.index.a_position,\n                shape_index: this.vertex_layout.index.a_shape,\n                offset_index: this.vertex_layout.index.a_offset,\n                offsets_index: this.vertex_layout.index.a_offsets,\n                pre_angles_index: this.vertex_layout.index.a_pre_angles,\n                angles_index: this.vertex_layout.index.a_angles,\n                outline_edge_index: sampler ? null : this.vertex_layout.index.a_outline_edge\n            },\n            {\n                quad: size,\n                quad_normalize: 256,    // values have an 8-bit fraction\n                offset,\n                offsets,\n                pre_angles: pre_angles,\n                angle: angle * 4096,    // values have a 12-bit fraction\n                angles: angles,\n                shape_w: sampler,\n                curve,\n                texcoord_scale,\n                texcoord_normalize,\n                pre_angles_normalize,\n                angles_normalize,\n                offsets_normalize\n            }\n        );\n    },\n\n    // Build quad for point sprite\n    build (style, vertex_data) {\n        let label = style.label;\n        if (label.type === 'curved') {\n            this.buildArticulatedLabel(label, style, vertex_data);\n        }\n        else {\n            this.buildLabel(label, style, vertex_data);\n        }\n    },\n\n    buildLabel (label, style, vertex_data) {\n        let vertex_template = this.makeVertexTemplate(style);\n        let angle = label.angle || style.angle;\n\n        let size, texcoords;\n        if (label.type){\n            size = style.size[label.type];\n            texcoords = style.texcoords[label.type];\n        }\n        else {\n            size = style.size;\n            texcoords = style.texcoords;\n        }\n\n        let offset = label.offset;\n\n        this.buildQuad(\n            [label.position],               // position\n            size,                           // size in pixels\n            angle,                          // angle in radians\n            null,                           // placeholder for multiple angles\n            null,                           // placeholder for multiple pre_angles\n            style.sampler,                  // texture sampler to use\n            offset,                         // offset from center in pixels\n            null,                           // placeholder for multiple offsets\n            texcoords,                      // texture UVs\n            false,                          // if curved\n            vertex_data, vertex_template    // VBO and data for current vertex\n        );\n    },\n\n    buildArticulatedLabel (label, style, vertex_data) {\n        let vertex_template = this.makeVertexTemplate(style);\n        let angle = label.angle;\n\n        // pass for stroke\n        for (let i = 0; i < label.num_segments; i++){\n            let size = style.size[label.type][i];\n            let texcoord_stroke = style.texcoords_stroke[i];\n\n            let offset = label.offset || [0,0];\n            let position = label.position;\n\n            let angles = label.angles[i];\n            let offsets = label.offsets[i];\n            let pre_angles = label.pre_angles[i];\n\n            this.buildQuad(\n                [position],                     // position\n                size,                           // size in pixels\n                angle,                          // angle in degrees\n                angles,                         // angles per segment\n                pre_angles,                     // pre_angle array (rotation applied before offseting)\n                style.sampler,                  // texture sampler to use\n                offset,                         // offset from center in pixels\n                offsets,                        // offsets per segment\n                texcoord_stroke,                // texture UVs for stroked text\n                true,                           // if curved\n                vertex_data, vertex_template    // VBO and data for current vertex\n            );\n        }\n\n        // pass for fill\n        for (let i = 0; i < label.num_segments; i++){\n            let size = style.size[label.type][i];\n            let texcoord = style.texcoords[label.type][i];\n\n            let offset = label.offset || [0,0];\n            let position = label.position;\n\n            let angles = label.angles[i];\n            let offsets = label.offsets[i];\n            let pre_angles = label.pre_angles[i];\n\n            this.buildQuad(\n                [position],                     // position\n                size,                           // size in pixels\n                angle,                          // angle in degrees\n                angles,                         // angles per segment\n                pre_angles,                     // pre_angle array (rotation applied before offseting)\n                style.sampler,                  // texture sampler to use\n                offset,                         // offset from center in pixels\n                offsets,                        // offsets per segment\n                texcoord,                       // texture UVs for fill text\n                true,                           // if curved\n                vertex_data, vertex_template    // VBO and data for current vertex\n            );\n        }\n    },\n\n    // Override to pass-through to generic point builder\n    buildLines (lines, style, vertex_data, context) {\n        this.build(style, vertex_data);\n    },\n\n    buildPoints (points, style, vertex_data, context) {\n        this.build(style, vertex_data);\n    },\n\n    buildPolygons (points, style, vertex_data, context) {\n        this.build(style, vertex_data);\n    },\n\n    makeMesh (vertex_data, vertex_elements, options = {}) {\n        // Add label fade time\n        options = Object.assign({}, options, { fade_in_time: this.fade_in_time });\n        return Style.makeMesh.call(this, vertex_data, vertex_elements, options);\n    }\n\n});\n",
     "// Polygon rendering style\n\nimport {Style} from '../style';\nimport {StyleParser} from '../style_parser';\nimport gl from '../../gl/constants'; // web workers don't have access to GL context, so import all GL constants\nimport VertexLayout from '../../gl/vertex_layout';\nimport {buildPolygons, buildExtrudedPolygons} from '../../builders/polygons';\nimport Geo from '../../geo';\n\nlet fs = require('fs');\nconst shaderSrc_polygonsVertex = fs.readFileSync(__dirname + '/polygons_vertex.glsl', 'utf8');\nconst shaderSrc_polygonsFragment = fs.readFileSync(__dirname + '/polygons_fragment.glsl', 'utf8');\n\nexport var Polygons = Object.create(Style);\n\n// export shaders for use in lines.js\nexport {\n    shaderSrc_polygonsVertex,\n    shaderSrc_polygonsFragment\n};\n\nObject.assign(Polygons, {\n    name: 'polygons',\n    built_in: true,\n    vertex_shader_src: shaderSrc_polygonsVertex,\n    fragment_shader_src: shaderSrc_polygonsFragment,\n\n    init() {\n        Style.init.apply(this, arguments);\n\n        // Basic attributes, others can be added (see texture UVs below)\n        var attribs = [\n            { name: 'a_position', size: 4, type: gl.SHORT, normalized: false },\n            { name: 'a_normal', size: 3, type: gl.BYTE, normalized: true }, // gets padded to 4-bytes\n            { name: 'a_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true }\n        ];\n\n        // Tell the shader we have a normal and order attributes\n        this.defines.TANGRAM_NORMAL_ATTRIBUTE = true;\n        this.defines.TANGRAM_LAYER_ORDER = true;\n\n        // Feature selection\n        this.selection = true;\n        attribs.push({ name: 'a_selection_color', size: 4, type: gl.UNSIGNED_BYTE, normalized: true });\n\n        // Optional texture UVs\n        if (this.texcoords) {\n            this.defines.TANGRAM_TEXTURE_COORDS = true;\n\n            // Add vertex attribute for UVs only when needed\n            attribs.push({ name: 'a_texcoord', size: 2, type: gl.UNSIGNED_SHORT, normalized: true });\n        }\n\n        this.vertex_layout = new VertexLayout(attribs);\n    },\n\n    _parseFeature (feature, draw, context) {\n        var style = this.feature_style;\n\n        style.color = this.parseColor(draw.color, context);\n        if (!style.color) {\n            return null;\n        }\n\n        style.z = (draw.z && StyleParser.evalCachedDistanceProperty(draw.z, context)) || StyleParser.defaults.z;\n        style.z *= Geo.height_scale; // provide sub-meter precision of height values\n\n        style.extrude = StyleParser.evalProperty(draw.extrude, context);\n        if (style.extrude) {\n            // use feature's height and min_height properties\n            if (style.extrude === true) {\n                style.height = feature.properties.height || StyleParser.defaults.height;\n                style.min_height = feature.properties.min_height || StyleParser.defaults.min_height;\n\n            }\n            // explicit height, no min_height\n            else if (typeof style.extrude === 'number') {\n                style.height = style.extrude;\n                style.min_height = 0;\n            }\n            // explicit height and min_height\n            else if (Array.isArray(style.extrude)) {\n                style.min_height = style.extrude[0];\n                style.height = style.extrude[1];\n            }\n\n            style.height *= Geo.height_scale;       // provide sub-meter precision of height values\n            style.min_height *= Geo.height_scale;\n        }\n\n        style.tile_edges = draw.tile_edges; // usually activated for debugging, or rare visualization needs\n\n        return style;\n    },\n\n    _preprocess (draw) {\n        draw.color = StyleParser.createColorPropertyCache(draw.color);\n        draw.z = StyleParser.createPropertyCache(draw.z, StyleParser.parseUnits);\n        return draw;\n    },\n\n    /**\n     * A \"template\" that sets constant attibutes for each vertex, which is then modified per vertex or per feature.\n     * A plain JS array matching the order of the vertex layout.\n     */\n    makeVertexTemplate(style) {\n        let i = 0;\n\n        // position - x & y coords will be filled in per-vertex below\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = style.z || 0;\n\n        // layer order - w coord of 'position' attribute (for packing efficiency)\n        this.vertex_template[i++] = this.scaleOrder(style.order);\n\n        // normal\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = 0;\n        this.vertex_template[i++] = 1 * 127;\n\n        // color\n        this.vertex_template[i++] = style.color[0] * 255;\n        this.vertex_template[i++] = style.color[1] * 255;\n        this.vertex_template[i++] = style.color[2] * 255;\n        this.vertex_template[i++] = style.color[3] * 255;\n\n        // selection color\n        if (this.selection) {\n            this.vertex_template[i++] = style.selection_color[0] * 255;\n            this.vertex_template[i++] = style.selection_color[1] * 255;\n            this.vertex_template[i++] = style.selection_color[2] * 255;\n            this.vertex_template[i++] = style.selection_color[3] * 255;\n        }\n\n        // Add texture UVs to template only if needed\n        if (this.texcoords) {\n            this.vertex_template[i++] = 0;\n            this.vertex_template[i++] = 0;\n        }\n\n        return this.vertex_template;\n    },\n\n    buildPolygons(polygons, style, vertex_data, context) {\n        let vertex_template = this.makeVertexTemplate(style);\n        let options = {\n            texcoord_index: this.vertex_layout.index.a_texcoord,\n            texcoord_normalize: 65535, // scale UVs to unsigned shorts\n            remove_tile_edges: !style.tile_edges,\n            tile_edge_tolerance: Geo.tile_scale * context.tile.pad_scale * 4,\n            winding: context.winding\n        };\n\n        // Extruded polygons (e.g. 3D buildings)\n        if (style.extrude && style.height) {\n            buildExtrudedPolygons(\n                polygons,\n                style.z, style.height, style.min_height,\n                vertex_data, vertex_template,\n                this.vertex_layout.index.a_normal,\n                127, // scale normals to signed bytes\n                options\n            );\n        }\n        // Regular polygons\n        else {\n            buildPolygons(\n                polygons,\n                vertex_data, vertex_template,\n                options\n            );\n        }\n    }\n\n});\n",
     "// Raster tile rendering style\n\nimport {StyleParser} from '../style_parser';\nimport {Polygons} from '../polygons/polygons';\n\nexport let RasterStyle = Object.create(Polygons);\n\nObject.assign(RasterStyle, {\n    name: 'raster',\n    super: Polygons,\n    built_in: true,\n\n    init() {\n        // Required for raster tiles\n        this.raster = this.raster || 'color';\n\n        this.super.init.apply(this, arguments);\n\n        this.selection = false; // raster styles can't support feature selection\n    },\n\n    _preprocess (draw) {\n        // Raster tiles default to white vertex color, as this color will tint the underlying texture\n        draw.color = draw.color || StyleParser.defaults.color;\n        return this.super._preprocess.apply(this, arguments);\n    }\n\n});\n",
-    "// Rendering styles\n\nimport {StyleParser} from './style_parser';\nimport FeatureSelection from '../selection';\nimport ShaderProgram from '../gl/shader_program';\nimport VBOMesh from '../gl/vbo_mesh';\nimport Texture from '../gl/texture';\nimport Material from '../material';\nimport Light from '../light';\nimport {RasterTileSource} from '../sources/raster';\nimport log from '../utils/log';\nimport mergeObjects from '../utils/merge';\nimport Thread from '../utils/thread';\nimport WorkerBroker from '../utils/worker_broker';\n\nlet fs = require('fs');\nconst shaderSrc_selectionFragment = fs.readFileSync(__dirname + '/../gl/shaders/selection_fragment.glsl', 'utf8');\nconst shaderSrc_rasters = fs.readFileSync(__dirname + '/../gl/shaders/rasters.glsl', 'utf8');\n\n// Base class\n\nexport var Style = {\n    init ({ generation, styles, sources = {}, introspection } = {}) {\n        this.generation = generation;               // scene generation id this style was created for\n        this.styles = styles;                       // styles for scene\n        this.sources = sources;                     // data sources for scene\n        this.defines = (this.hasOwnProperty('defines') && this.defines) || {}; // #defines to be injected into the shaders\n        this.shaders = (this.hasOwnProperty('shaders') && this.shaders) || {}; // shader customization (uniforms, defines, blocks, etc.)\n        this.introspection = introspection || false;\n        this.selection = this.selection || this.introspection || false;   // flag indicating if this style supports feature selection\n        this.compile_setup = false;                 // one-time setup steps for program compilation\n        this.program = null;                        // GL program reference (for main render pass)\n        this.selection_program = null;              // GL program reference for feature selection render pass\n        this.feature_style = {};                    // style for feature currently being parsed, shared to lessen GC/memory thrash\n        this.vertex_template = [];                  // shared single-vertex template, filled out by each style\n        this.tile_data = {};\n\n        // Provide a hook for this object to be called from worker threads\n        this.main_thread_target = ['Style', this.name, this.generation].join('/');\n        if (Thread.is_main) {\n            WorkerBroker.addTarget(this.main_thread_target, this);\n        }\n\n        // Default world coords to wrap every 100,000 meters, can turn off by setting this to 'false'\n        this.defines.TANGRAM_WORLD_POSITION_WRAP = 100000;\n\n        // Blending\n        this.blend = this.blend || 'opaque';        // default: opaque styles are drawn first, without blending\n        this.defines[`TANGRAM_BLEND_${this.blend.toUpperCase()}`] = true;\n        if (this.blend_order == null) { // controls order of rendering for styles w/non-opaque blending\n            this.blend_order = -1; // defaults to first\n        }\n\n        this.removeShaderBlock('setup'); // clear before material injection\n\n        // If the style defines its own material, replace the inherited material instance\n        if (!(this.material instanceof Material)) {\n            if (!Material.isValid(this.material)) {\n                this.material = StyleParser.defaults.material;\n            }\n            this.material = new Material(this.material);\n        }\n        this.material.inject(this);\n\n        // Set lighting mode: fragment, vertex, or none (specified as 'false')\n        Light.setMode(this.lighting, this);\n\n        // Setup raster samplers if needed\n        this.setupRasters();\n\n        this.initialized = true;\n    },\n\n    destroy () {\n        if (this.program) {\n            this.program.destroy();\n            this.program = null;\n        }\n\n        if (this.selection_program) {\n            this.selection_program.destroy();\n            this.selection_program = null;\n        }\n\n        this.gl = null;\n        this.initialized = false;\n    },\n\n    reset () {\n    },\n\n    baseStyle () {\n        return this.base || this.name;\n    },\n\n    fillVertexTemplate(attribute, value, { size, offset }) {\n        offset = (offset === undefined) ? 0 : offset;\n\n        let index = this.vertex_layout.index[attribute];\n        if (index === undefined) {\n            log('warn', `Style: in style '${this.name}', no index found in vertex layout for attribute '${attribute}'`);\n            return;\n        }\n\n        for (let i = 0; i < size; ++i) {\n            let v = value.length > i ? value[i] : value;\n            this.vertex_template[index + i + offset] = v;\n        }\n    },\n\n    /*** Style parsing and geometry construction ***/\n\n    // Returns an object to hold feature data (for a tile or other object)\n    startData (tile) {\n        this.tile_data[tile.key] = {\n            vertex_data: null,\n            uniforms: {},\n            textures: []\n        };\n        return this.tile_data[tile.key];\n    },\n\n    // Finalizes an object holding feature data (for a tile or other object)\n    endData (tile) {\n        var tile_data = this.tile_data[tile.key];\n        this.tile_data[tile.key] = null;\n\n        if (tile_data && tile_data.vertex_data && tile_data.vertex_data.vertex_count > 0) {\n            // Only keep final byte buffer\n            tile_data.vertex_data.end();\n            tile_data.vertex_elements = tile_data.vertex_data.element_buffer;\n            tile_data.vertex_data = tile_data.vertex_data.vertex_buffer; // convert from instance to raw typed array\n\n            // Load raster tiles passed from data source\n            // Blocks mesh completion to avoid flickering\n            return this.buildRasterTextures(tile, tile_data).then(() => tile_data);\n        }\n        else {\n            return Promise.resolve(null); // don't send tile data back if doesn't have geometry\n        }\n    },\n\n    // Has mesh data for a given tile?\n    hasDataForTile (tile_key) {\n        return this.tile_data[tile_key] != null;\n    },\n\n    addFeature (feature, draw, context) {\n        let tile = context.tile;\n        if (tile.generation !== this.generation) {\n            return;\n        }\n\n        if (!this.tile_data[tile.key]) {\n            this.startData(tile);\n        }\n\n        let style = this.parseFeature(feature, draw, context);\n\n        // Skip feature?\n        if (!style) {\n            return;\n        }\n\n        // First feature in this render style?\n        if (!this.tile_data[tile.key].vertex_data) {\n            this.tile_data[tile.key].vertex_data = this.vertex_layout.createVertexData();\n        }\n\n        this.buildGeometry(feature.geometry, style, this.tile_data[tile.key].vertex_data, context);\n    },\n\n    buildGeometry (geometry, style, vertex_data, context) {\n        if (geometry.type === 'Polygon') {\n            this.buildPolygons([geometry.coordinates], style, vertex_data, context);\n        }\n        else if (geometry.type === 'MultiPolygon') {\n            this.buildPolygons(geometry.coordinates, style, vertex_data, context);\n        }\n        else if (geometry.type === 'LineString') {\n            this.buildLines([geometry.coordinates], style, vertex_data, context);\n        }\n        else if (geometry.type === 'MultiLineString') {\n            this.buildLines(geometry.coordinates, style, vertex_data, context);\n        }\n        else if (geometry.type === 'Point') {\n            this.buildPoints([geometry.coordinates], style, vertex_data, context);\n        }\n        else if (geometry.type === 'MultiPoint') {\n            this.buildPoints(geometry.coordinates, style, vertex_data, context);\n        }\n    },\n\n    parseFeature (feature, draw, context) {\n        try {\n            var style = this.feature_style;\n\n            draw = this.preprocess(draw);\n            if (!draw) {\n                return;\n            }\n\n            // Calculate order\n            style.order = this.parseOrder(draw.order, context);\n            if (style.order == null && this.blend !== 'overlay') {\n                log({ level: 'warn', once: true }, `Layer '${draw.layers[draw.layers.length-1]}': 'order' parameter is required unless blend mode is 'overlay'`);\n                return;\n            }\n\n            // Feature selection (only if style supports it)\n            var selectable = false;\n            style.interactive = this.introspection || draw.interactive;\n            if (this.selection) {\n                selectable = StyleParser.evalProperty(style.interactive, context);\n            }\n\n            // If feature is marked as selectable\n            if (selectable) {\n                style.selection_color = FeatureSelection.makeColor(feature, context.tile, context);\n            }\n            else {\n                style.selection_color = FeatureSelection.defaultColor;\n            }\n\n            // Subclass implementation\n            style = this._parseFeature(feature, draw, context);\n\n            return style;\n        }\n        catch(error) {\n            log('error', 'Style.parseFeature: style parsing error', feature, style, error);\n        }\n    },\n\n    _parseFeature (feature, draw, context) {\n        return this.feature_style;\n    },\n\n    preprocess (draw) {\n        // Preprocess first time\n        if (!draw.preprocessed) {\n            // Apply draw defaults\n            if (this.draw) {\n                mergeObjects(draw, this.draw);\n            }\n\n            draw = this._preprocess(draw); // optional subclass implementation\n            if (!draw) {\n                return;\n            }\n            draw.preprocessed = true;\n        }\n        return draw;\n    },\n\n    // optionally implemented by subclass\n    _preprocess (draw) {\n        return draw;\n    },\n\n    // Parse an order value\n    parseOrder (order, context) {\n        // Calculate order if it was not cached\n        if (typeof order !== 'number') {\n            return StyleParser.calculateOrder(order, context);\n        }\n        return order;\n    },\n\n    // Expand final precision for half-layers (for outlines)\n    scaleOrder (order) {\n        return order * 2;\n    },\n\n    // Parse a color of choose a default if acceptable, return undefined if color missing\n    parseColor(color, context) {\n        // Need either a color, or a shader block for 'color' or 'filter'\n        if (color) {\n            return StyleParser.evalCachedColorProperty(color, context);\n        }\n        else if (this.shaders.blocks.color || this.shaders.blocks.filter) {\n            return StyleParser.defaults.color;\n        }\n    },\n\n    // Build functions are no-ops until overriden\n    buildPolygons () {},\n    buildLines () {},\n    buildPoints () {},\n\n\n    /*** GL state and rendering ***/\n\n    setGL (gl) {\n        this.gl = gl;\n        this.max_texture_size = Texture.getMaxTextureSize(this.gl);\n    },\n\n    makeMesh (vertex_data, vertex_elements, options = {}) {\n        return new VBOMesh(this.gl, vertex_data, vertex_elements, this.vertex_layout, options);\n    },\n\n    render (mesh) {\n        return mesh.render();\n    },\n\n    // Get a specific program, compiling if necessary\n    getProgram (key = 'program') {\n        this.compileSetup();\n\n        const program = this[key];\n        if (!program || program.error) {\n            return;\n        }\n\n        if (!program.compiled) {\n            log('debug', `Compiling style '${this.name}', program key '${key}'`);\n            program.compile();\n        }\n        return program;\n    },\n\n    // One-time setup for compiling style's programs\n    compileSetup () {\n        if (this.compile_setup) {\n            return;\n        }\n\n        if (!this.gl) {\n            throw(new Error(`style.compile(): skipping for ${this.name} because no GL context`));\n        }\n\n        // Build defines & for selection (need to create a new object since the first is stored as a reference by the program)\n        var defines = this.buildDefineList();\n        if (this.selection) {\n            var selection_defines = Object.assign({}, defines);\n            selection_defines.TANGRAM_FEATURE_SELECTION = true;\n        }\n\n        // Shader blocks\n        var blocks = (this.shaders && this.shaders.blocks);\n        var block_scopes = (this.shaders && this.shaders.block_scopes);\n\n        // Uniforms\n        var uniforms = Object.assign({}, this.shaders && this.shaders.uniforms);\n        for (let u in uniforms) { // validate uniforms\n            if (uniforms[u] == null) {\n                log({ level: 'warn', once: true }, `Style '${this.name}' has invalid uniform '${u}': uniform values must be non-null`);\n            }\n        }\n\n        // Accept a single extension, or an array of extensions\n        var extensions = (this.shaders && this.shaders.extensions);\n        if (typeof extensions === 'string') {\n            extensions = [extensions];\n        }\n\n        // Create shaders\n        this.program = new ShaderProgram(\n            this.gl,\n            this.vertex_shader_src,\n            this.fragment_shader_src,\n            {\n                name: this.name,\n                defines,\n                uniforms,\n                blocks,\n                block_scopes,\n                extensions\n            }\n        );\n\n        if (this.selection) {\n            this.selection_program = new ShaderProgram(\n                this.gl,\n                this.vertex_shader_src,\n                shaderSrc_selectionFragment,\n                {\n                    name: (this.name + ' (selection)'),\n                    defines: selection_defines,\n                    uniforms,\n                    blocks,\n                    block_scopes,\n                    extensions\n                }\n            );\n        }\n        else {\n            this.selection_program = null;\n        }\n\n        this.compile_setup = true;\n    },\n\n    // Add a shader block\n    addShaderBlock (key, block, scope = null) {\n        this.shaders.blocks = this.shaders.blocks || {};\n        this.shaders.blocks[key] = this.shaders.blocks[key] || [];\n        this.shaders.blocks[key].push(block);\n\n        this.shaders.block_scopes = this.shaders.block_scopes || {};\n        this.shaders.block_scopes[key] = this.shaders.block_scopes[key] || [];\n        this.shaders.block_scopes[key].push(scope);\n    },\n\n    // Remove all shader blocks for key\n    removeShaderBlock (key) {\n        if (this.shaders.blocks) {\n            this.shaders.blocks[key] = null;\n        }\n    },\n\n    replaceShaderBlock (key, block, scope = null) {\n        this.removeShaderBlock(key);\n        this.addShaderBlock(key, block, scope);\n    },\n\n    /** TODO: could probably combine and generalize this with similar method in ShaderProgram\n     * (list of define objects that inherit from each other)\n     */\n    buildDefineList () {\n        // Add any custom defines to built-in style defines\n        var defines = {}; // create a new object to avoid mutating a prototype value that may be shared with other styles\n        if (this.defines != null) {\n            for (var d in this.defines) {\n                defines[d] = this.defines[d];\n            }\n        }\n        if (this.shaders != null && this.shaders.defines != null) {\n            for (d in this.shaders.defines) {\n                defines[d] = this.shaders.defines[d];\n            }\n        }\n        return defines;\n\n    },\n\n    // Determines if 'raster' parameter is set to a valid value\n    hasRasters () {\n        return (['color', 'normal', 'custom'].indexOf(this.raster) > -1);\n    },\n\n    // Setup raster access in shaders\n    setupRasters () {\n        if (!this.hasRasters()) {\n            return;\n        }\n\n        // Enable raster textures and configure how first raster is applied\n        if (this.raster === 'color') {\n            this.defines.TANGRAM_RASTER_TEXTURE_COLOR = true;\n        }\n        else if (this.raster === 'normal') {\n            this.defines.TANGRAM_RASTER_TEXTURE_NORMAL = true;\n        }\n        // else custom raster (samplers will be made available but not automatically applied)\n\n        // A given style may be built with multiple data sources, each of which may attach\n        // a variable number of raster sources (0 to N, where N is the max number of raster sources\n        // defined for the scene). This means we don't know *which* or *how many* rasters will be\n        // bound now, at initial compile-time; we only know this at geometry build-time. To ensure\n        // that we can bind as many raster sources as needed, we declare our uniform arrays to hold\n        // the maximum number of possible sources. At render time, only the necessary number of rasters\n        // are bound (the remaining slots aren't intended to be accessed).\n        let num_raster_sources =\n            Object.keys(this.sources)\n            .filter(s => this.sources[s] instanceof RasterTileSource)\n            .length;\n\n        this.defines.TANGRAM_NUM_RASTER_SOURCES = `int(${num_raster_sources})`;\n        if (num_raster_sources > 0) {\n            // Use model position of tile's coordinate zoom for raster tile texture UVs\n            this.defines.TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING = true;\n\n            // Uniforms and macros for raster samplers\n            this.replaceShaderBlock('raster', shaderSrc_rasters, 'Raster');\n        }\n    },\n\n    // Load raster tile textures and set uniforms\n    buildRasterTextures (tile, tile_data) {\n        if (!this.hasRasters()) {\n            return Promise.resolve(tile_data);\n        }\n\n        let configs = {}; // texture configs to pass to texture builder, keyed by texture name\n        let index = {};   // index into raster sampler array, keyed by texture name\n\n        // TODO: data source could retrieve raster texture URLs\n        tile.rasters.map(r => this.sources[r]).filter(x => x).forEach((source, i) => {\n            if (source instanceof RasterTileSource) {\n                let config = source.tileTexture(tile);\n                configs[config.url] = config;\n                index[config.url] = i;\n            }\n        });\n\n        if (Object.keys(configs).length === 0) {\n            return Promise.resolve(tile_data);\n        }\n\n        // Load textures on main thread and return when done\n        // We want to block the building of a raster tile mesh until its texture is loaded,\n        // to avoid flickering while loading (texture will render as black)\n        return WorkerBroker.postMessage(this.main_thread_target+'.loadTextures', configs)\n            .then(textures => {\n                if (!textures || textures.length < 1) {\n                    // TODO: warning\n                    return tile_data;\n                }\n\n                // Set texture uniforms (returned after loading from main thread)\n                tile_data.uniforms = tile_data.uniforms || {};\n                tile_data.textures = tile_data.textures || [];\n\n                let u_samplers = tile_data.uniforms['u_rasters'] = [];\n                let u_sizes = tile_data.uniforms['u_raster_sizes'] = [];\n                let u_offsets = tile_data.uniforms['u_raster_offsets'] = [];\n\n                textures.forEach(([tname, twidth, theight]) => {\n                    let i = index[tname];\n                    let raster_coords = configs[tname].coords; // tile coords of raster tile\n\n                    u_samplers[i] = tname;\n                    tile_data.textures.push(tname);\n\n                    u_sizes[i] = [twidth, theight];\n\n                    // Tile geometry may be at a higher zoom than the raster tile texture,\n                    // (e.g. an overzoomed raster tile), in which case we need to adjust the\n                    // raster texture UVs to offset to the appropriate starting point for\n                    // this geometry tile.\n                    if (tile.coords.z > raster_coords.z) {\n                        let dz = tile.coords.z - raster_coords.z; // # of levels raster source is overzoomed\n                        let dz2 = Math.pow(2, dz);\n                        u_offsets[i] = [\n                            (tile.coords.x % dz2) / dz2,\n                            (dz2 - 1 - (tile.coords.y % dz2)) / dz2, // GL texture coords are +Y up\n                            1 / dz2\n                        ];\n                    }\n                    else {\n                        u_offsets[i] = [0, 0, 1];\n                    }\n                });\n\n                return tile_data;\n            }\n        );\n    },\n\n    // Called on main thread\n    loadTextures (textures) {\n        // NB: only return name and size of textures loaded, because we can't send actual texture objects to worker\n        return Texture.createFromObject(this.gl, textures)\n            .then(() => {\n                return Promise.all(Object.keys(textures).map(t => {\n                    return Texture.textures[t] && Texture.textures[t].load();\n                }).filter(x => x));\n            })\n            .then(textures => {\n                textures.forEach(t => t.retain());\n                return textures.map(t => [t.name, t.width, t.height]);\n            });\n    },\n\n    // Setup any GL state for rendering\n    setup () {\n        this.setUniforms();\n        this.material.setupProgram(ShaderProgram.current);\n    },\n\n    // Set style uniforms on currently bound program\n    setUniforms () {\n        var program = ShaderProgram.current;\n        if (!program) {\n            return;\n        }\n\n        program.setUniforms(this.shaders && this.shaders.uniforms, true); // reset texture unit to 0\n    },\n\n    // Render state settings by blend mode\n    render_states: {\n        opaque: { depth_test: true, depth_write: true },\n        add: { depth_test: true, depth_write: false },\n        multiply: { depth_test: true, depth_write: false },\n        inlay: { depth_test: true, depth_write: false },\n        overlay: { depth_test: false, depth_write: false }\n    },\n\n    // Default sort order for blend modes\n    default_blend_orders: {\n        opaque: 0,\n        add: 1,\n        multiply: 2,\n        inlay: 3,\n        overlay: 4\n    },\n\n    // Comparison function for sorting styles by blend\n    blendOrderSort (a, b) {\n        // opaque always comes first\n        if (a.blend === 'opaque' || b.blend === 'opaque') {\n            if (a.blend === 'opaque' && b.blend === 'opaque') { // if both are opaque\n                return a.name < b.name ? -1 : 1; // use name as tie breaker\n            }\n            else if (a.blend === 'opaque') {\n                return -1; // only `a` was opaque\n            }\n            else {\n                return 1; // only `b` was opaque\n            }\n        }\n\n        // use explicit blend order if possible\n        if (a.blend_order < b.blend_order) {\n            return -1;\n        }\n        else if (a.blend_order > b.blend_order) {\n            return 1;\n        }\n\n        // if blend orders are equal, use default order by blend mode\n        if (Style.default_blend_orders[a.blend] < Style.default_blend_orders[b.blend]) {\n            return -1;\n        }\n        else if (Style.default_blend_orders[a.blend] > Style.default_blend_orders[b.blend]) {\n            return 1;\n        }\n\n        return a.name < b.name ? -1 : 1; // use name as tie breaker\n    }\n\n};\n",
+    "// Rendering styles\n\nimport {StyleParser} from './style_parser';\nimport FeatureSelection from '../selection';\nimport ShaderProgram from '../gl/shader_program';\nimport VBOMesh from '../gl/vbo_mesh';\nimport Texture from '../gl/texture';\nimport Material from '../material';\nimport Light from '../light';\nimport {RasterTileSource} from '../sources/raster';\nimport log from '../utils/log';\nimport mergeObjects from '../utils/merge';\nimport Thread from '../utils/thread';\nimport WorkerBroker from '../utils/worker_broker';\n\nlet fs = require('fs');\nconst shaderSrc_selectionFragment = fs.readFileSync(__dirname + '/../gl/shaders/selection_fragment.glsl', 'utf8');\nconst shaderSrc_rasters = fs.readFileSync(__dirname + '/../gl/shaders/rasters.glsl', 'utf8');\n\n// Base class\n\nexport var Style = {\n    init ({ generation, styles, sources = {}, introspection } = {}) {\n        this.generation = generation;               // scene generation id this style was created for\n        this.styles = styles;                       // styles for scene\n        this.sources = sources;                     // data sources for scene\n        this.defines = (this.hasOwnProperty('defines') && this.defines) || {}; // #defines to be injected into the shaders\n        this.shaders = (this.hasOwnProperty('shaders') && this.shaders) || {}; // shader customization (uniforms, defines, blocks, etc.)\n        this.introspection = introspection || false;\n        this.selection = this.selection || this.introspection || false;   // flag indicating if this style supports feature selection\n        this.compile_setup = false;                 // one-time setup steps for program compilation\n        this.program = null;                        // GL program reference (for main render pass)\n        this.selection_program = null;              // GL program reference for feature selection render pass\n        this.feature_style = {};                    // style for feature currently being parsed, shared to lessen GC/memory thrash\n        this.vertex_template = [];                  // shared single-vertex template, filled out by each style\n        this.tile_data = {};\n\n        // Provide a hook for this object to be called from worker threads\n        this.main_thread_target = ['Style', this.name, this.generation].join('/');\n        if (Thread.is_main) {\n            WorkerBroker.addTarget(this.main_thread_target, this);\n        }\n\n        // Default world coords to wrap every 100,000 meters, can turn off by setting this to 'false'\n        this.defines.TANGRAM_WORLD_POSITION_WRAP = 100000;\n\n        // Blending\n        this.blend = this.blend || 'opaque';        // default: opaque styles are drawn first, without blending\n        this.defines[`TANGRAM_BLEND_${this.blend.toUpperCase()}`] = true;\n        if (this.blend_order == null) { // controls order of rendering for styles w/non-opaque blending\n            this.blend_order = -1; // defaults to first\n        }\n\n        this.removeShaderBlock('setup'); // clear before material injection\n\n        // If the style defines its own material, replace the inherited material instance\n        if (!(this.material instanceof Material)) {\n            if (!Material.isValid(this.material)) {\n                this.material = StyleParser.defaults.material;\n            }\n            this.material = new Material(this.material);\n        }\n        this.material.inject(this);\n\n        // Set lighting mode: fragment, vertex, or none (specified as 'false')\n        Light.setMode(this.lighting, this);\n\n        // Setup raster samplers if needed\n        this.setupRasters();\n\n        this.initialized = true;\n    },\n\n    destroy () {\n        if (this.program) {\n            this.program.destroy();\n            this.program = null;\n        }\n\n        if (this.selection_program) {\n            this.selection_program.destroy();\n            this.selection_program = null;\n        }\n\n        this.gl = null;\n        this.initialized = false;\n    },\n\n    reset () {\n    },\n\n    baseStyle () {\n        return this.base || this.name;\n    },\n\n    fillVertexTemplate(attribute, value, { size, offset }) {\n        offset = (offset === undefined) ? 0 : offset;\n\n        let index = this.vertex_layout.index[attribute];\n        if (index === undefined) {\n            log('warn', `Style: in style '${this.name}', no index found in vertex layout for attribute '${attribute}'`);\n            return;\n        }\n\n        for (let i = 0; i < size; ++i) {\n            let v = value.length > i ? value[i] : value;\n            this.vertex_template[index + i + offset] = v;\n        }\n    },\n\n    /*** Style parsing and geometry construction ***/\n\n    // Returns an object to hold feature data (for a tile or other object)\n    startData (tile) {\n        this.tile_data[tile.key] = {\n            vertex_data: null,\n            uniforms: {},\n            textures: []\n        };\n        return this.tile_data[tile.key];\n    },\n\n    // Finalizes an object holding feature data (for a tile or other object)\n    endData (tile) {\n        var tile_data = this.tile_data[tile.key];\n        this.tile_data[tile.key] = null;\n\n        if (tile_data && tile_data.vertex_data && tile_data.vertex_data.vertex_count > 0) {\n            // Only keep final byte buffer\n            tile_data.vertex_data.end();\n            tile_data.vertex_elements = tile_data.vertex_data.element_buffer;\n            tile_data.vertex_data = tile_data.vertex_data.vertex_buffer; // convert from instance to raw typed array\n\n            // Load raster tiles passed from data source\n            // Blocks mesh completion to avoid flickering\n            return this.buildRasterTextures(tile, tile_data).then(() => tile_data);\n        }\n        else {\n            return Promise.resolve(null); // don't send tile data back if doesn't have geometry\n        }\n    },\n\n    // Has mesh data for a given tile?\n    hasDataForTile (tile_key) {\n        return this.tile_data[tile_key] != null;\n    },\n\n    addFeature (feature, draw, context) {\n        let tile = context.tile;\n        if (tile.generation !== this.generation) {\n            return;\n        }\n\n        if (!this.tile_data[tile.key]) {\n            this.startData(tile);\n        }\n\n        let style = this.parseFeature(feature, draw, context);\n\n        // Skip feature?\n        if (!style) {\n            return;\n        }\n\n        // First feature in this render style?\n        if (!this.tile_data[tile.key].vertex_data) {\n            this.tile_data[tile.key].vertex_data = this.vertex_layout.createVertexData();\n        }\n\n        this.buildGeometry(feature.geometry, style, this.tile_data[tile.key].vertex_data, context);\n    },\n\n    buildGeometry (geometry, style, vertex_data, context) {\n        if (geometry.type === 'Polygon') {\n            this.buildPolygons([geometry.coordinates], style, vertex_data, context);\n        }\n        else if (geometry.type === 'MultiPolygon') {\n            this.buildPolygons(geometry.coordinates, style, vertex_data, context);\n        }\n        else if (geometry.type === 'LineString') {\n            this.buildLines([geometry.coordinates], style, vertex_data, context);\n        }\n        else if (geometry.type === 'MultiLineString') {\n            this.buildLines(geometry.coordinates, style, vertex_data, context);\n        }\n        else if (geometry.type === 'Point') {\n            this.buildPoints([geometry.coordinates], style, vertex_data, context);\n        }\n        else if (geometry.type === 'MultiPoint') {\n            this.buildPoints(geometry.coordinates, style, vertex_data, context);\n        }\n    },\n\n    parseFeature (feature, draw, context) {\n        try {\n            var style = this.feature_style;\n\n            draw = this.preprocess(draw);\n            if (!draw) {\n                return;\n            }\n\n            // Calculate order\n            style.order = this.parseOrder(draw.order, context);\n            if (style.order == null && this.blend !== 'overlay') {\n                let msg = `Layer '${draw.layers.join(', ')}', draw group '${draw.group}': `;\n                msg += `'order' parameter is required unless blend mode is 'overlay'`;\n                if (draw.order != null) {\n                    msg += `; 'order' was set to a dynamic value (e.g. string tied to feature property, `;\n                    msg += `or JS function), but evaluated to null for one or more features`;\n                }\n                log({ level: 'warn', once: true }, msg);\n                return;\n            }\n\n            // Feature selection (only if style supports it)\n            var selectable = false;\n            style.interactive = this.introspection || draw.interactive;\n            if (this.selection) {\n                selectable = StyleParser.evalProperty(style.interactive, context);\n            }\n\n            // If feature is marked as selectable\n            if (selectable) {\n                style.selection_color = FeatureSelection.makeColor(feature, context.tile, context);\n            }\n            else {\n                style.selection_color = FeatureSelection.defaultColor;\n            }\n\n            // Subclass implementation\n            style = this._parseFeature(feature, draw, context);\n\n            return style;\n        }\n        catch(error) {\n            log('error', 'Style.parseFeature: style parsing error', feature, style, error);\n        }\n    },\n\n    _parseFeature (feature, draw, context) {\n        return this.feature_style;\n    },\n\n    preprocess (draw) {\n        // Preprocess first time\n        if (!draw.preprocessed) {\n            // Apply draw defaults\n            if (this.draw) {\n                mergeObjects(draw, this.draw);\n            }\n\n            draw = this._preprocess(draw); // optional subclass implementation\n            if (!draw) {\n                return;\n            }\n            draw.preprocessed = true;\n        }\n        return draw;\n    },\n\n    // optionally implemented by subclass\n    _preprocess (draw) {\n        return draw;\n    },\n\n    // Parse an order value\n    parseOrder (order, context) {\n        // Calculate order if it was not cached\n        if (typeof order !== 'number') {\n            return StyleParser.calculateOrder(order, context);\n        }\n        return order;\n    },\n\n    // Expand final precision for half-layers (for outlines)\n    scaleOrder (order) {\n        return order * 2;\n    },\n\n    // Parse a color of choose a default if acceptable, return undefined if color missing\n    parseColor(color, context) {\n        // Need either a color, or a shader block for 'color' or 'filter'\n        if (color) {\n            return StyleParser.evalCachedColorProperty(color, context);\n        }\n        else if (this.shaders.blocks.color || this.shaders.blocks.filter) {\n            return StyleParser.defaults.color;\n        }\n    },\n\n    // Build functions are no-ops until overriden\n    buildPolygons () {},\n    buildLines () {},\n    buildPoints () {},\n\n\n    /*** GL state and rendering ***/\n\n    setGL (gl) {\n        this.gl = gl;\n        this.max_texture_size = Texture.getMaxTextureSize(this.gl);\n    },\n\n    makeMesh (vertex_data, vertex_elements, options = {}) {\n        return new VBOMesh(this.gl, vertex_data, vertex_elements, this.vertex_layout, options);\n    },\n\n    render (mesh) {\n        return mesh.render();\n    },\n\n    // Get a specific program, compiling if necessary\n    getProgram (key = 'program') {\n        this.compileSetup();\n\n        const program = this[key];\n        if (!program || program.error) {\n            return;\n        }\n\n        if (!program.compiled) {\n            log('debug', `Compiling style '${this.name}', program key '${key}'`);\n            program.compile();\n        }\n        return program;\n    },\n\n    // One-time setup for compiling style's programs\n    compileSetup () {\n        if (this.compile_setup) {\n            return;\n        }\n\n        if (!this.gl) {\n            throw(new Error(`style.compile(): skipping for ${this.name} because no GL context`));\n        }\n\n        // Build defines & for selection (need to create a new object since the first is stored as a reference by the program)\n        var defines = this.buildDefineList();\n        if (this.selection) {\n            var selection_defines = Object.assign({}, defines);\n            selection_defines.TANGRAM_FEATURE_SELECTION = true;\n        }\n\n        // Shader blocks\n        var blocks = (this.shaders && this.shaders.blocks);\n        var block_scopes = (this.shaders && this.shaders.block_scopes);\n\n        // Uniforms\n        var uniforms = Object.assign({}, this.shaders && this.shaders.uniforms);\n        for (let u in uniforms) { // validate uniforms\n            if (uniforms[u] == null) {\n                log({ level: 'warn', once: true }, `Style '${this.name}' has invalid uniform '${u}': uniform values must be non-null`);\n            }\n        }\n\n        // Accept a single extension, or an array of extensions\n        var extensions = (this.shaders && this.shaders.extensions);\n        if (typeof extensions === 'string') {\n            extensions = [extensions];\n        }\n\n        // Create shaders\n        this.program = new ShaderProgram(\n            this.gl,\n            this.vertex_shader_src,\n            this.fragment_shader_src,\n            {\n                name: this.name,\n                defines,\n                uniforms,\n                blocks,\n                block_scopes,\n                extensions\n            }\n        );\n\n        if (this.selection) {\n            this.selection_program = new ShaderProgram(\n                this.gl,\n                this.vertex_shader_src,\n                shaderSrc_selectionFragment,\n                {\n                    name: (this.name + ' (selection)'),\n                    defines: selection_defines,\n                    uniforms,\n                    blocks,\n                    block_scopes,\n                    extensions\n                }\n            );\n        }\n        else {\n            this.selection_program = null;\n        }\n\n        this.compile_setup = true;\n    },\n\n    // Add a shader block\n    addShaderBlock (key, block, scope = null) {\n        this.shaders.blocks = this.shaders.blocks || {};\n        this.shaders.blocks[key] = this.shaders.blocks[key] || [];\n        this.shaders.blocks[key].push(block);\n\n        this.shaders.block_scopes = this.shaders.block_scopes || {};\n        this.shaders.block_scopes[key] = this.shaders.block_scopes[key] || [];\n        this.shaders.block_scopes[key].push(scope);\n    },\n\n    // Remove all shader blocks for key\n    removeShaderBlock (key) {\n        if (this.shaders.blocks) {\n            this.shaders.blocks[key] = null;\n        }\n    },\n\n    replaceShaderBlock (key, block, scope = null) {\n        this.removeShaderBlock(key);\n        this.addShaderBlock(key, block, scope);\n    },\n\n    /** TODO: could probably combine and generalize this with similar method in ShaderProgram\n     * (list of define objects that inherit from each other)\n     */\n    buildDefineList () {\n        // Add any custom defines to built-in style defines\n        var defines = {}; // create a new object to avoid mutating a prototype value that may be shared with other styles\n        if (this.defines != null) {\n            for (var d in this.defines) {\n                defines[d] = this.defines[d];\n            }\n        }\n        if (this.shaders != null && this.shaders.defines != null) {\n            for (d in this.shaders.defines) {\n                defines[d] = this.shaders.defines[d];\n            }\n        }\n        return defines;\n\n    },\n\n    // Determines if 'raster' parameter is set to a valid value\n    hasRasters () {\n        return (['color', 'normal', 'custom'].indexOf(this.raster) > -1);\n    },\n\n    // Setup raster access in shaders\n    setupRasters () {\n        if (!this.hasRasters()) {\n            return;\n        }\n\n        // Enable raster textures and configure how first raster is applied\n        if (this.raster === 'color') {\n            this.defines.TANGRAM_RASTER_TEXTURE_COLOR = true;\n        }\n        else if (this.raster === 'normal') {\n            this.defines.TANGRAM_RASTER_TEXTURE_NORMAL = true;\n        }\n        // else custom raster (samplers will be made available but not automatically applied)\n\n        // A given style may be built with multiple data sources, each of which may attach\n        // a variable number of raster sources (0 to N, where N is the max number of raster sources\n        // defined for the scene). This means we don't know *which* or *how many* rasters will be\n        // bound now, at initial compile-time; we only know this at geometry build-time. To ensure\n        // that we can bind as many raster sources as needed, we declare our uniform arrays to hold\n        // the maximum number of possible sources. At render time, only the necessary number of rasters\n        // are bound (the remaining slots aren't intended to be accessed).\n        let num_raster_sources =\n            Object.keys(this.sources)\n            .filter(s => this.sources[s] instanceof RasterTileSource)\n            .length;\n\n        this.defines.TANGRAM_NUM_RASTER_SOURCES = `int(${num_raster_sources})`;\n        if (num_raster_sources > 0) {\n            // Use model position of tile's coordinate zoom for raster tile texture UVs\n            this.defines.TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING = true;\n\n            // Uniforms and macros for raster samplers\n            this.replaceShaderBlock('raster', shaderSrc_rasters, 'Raster');\n        }\n    },\n\n    // Load raster tile textures and set uniforms\n    buildRasterTextures (tile, tile_data) {\n        if (!this.hasRasters()) {\n            return Promise.resolve(tile_data);\n        }\n\n        let configs = {}; // texture configs to pass to texture builder, keyed by texture name\n        let index = {};   // index into raster sampler array, keyed by texture name\n\n        // TODO: data source could retrieve raster texture URLs\n        tile.rasters.map(r => this.sources[r]).filter(x => x).forEach((source, i) => {\n            if (source instanceof RasterTileSource) {\n                let config = source.tileTexture(tile);\n                configs[config.url] = config;\n                index[config.url] = i;\n            }\n        });\n\n        if (Object.keys(configs).length === 0) {\n            return Promise.resolve(tile_data);\n        }\n\n        // Load textures on main thread and return when done\n        // We want to block the building of a raster tile mesh until its texture is loaded,\n        // to avoid flickering while loading (texture will render as black)\n        return WorkerBroker.postMessage(this.main_thread_target+'.loadTextures', configs)\n            .then(textures => {\n                if (!textures || textures.length < 1) {\n                    // TODO: warning\n                    return tile_data;\n                }\n\n                // Set texture uniforms (returned after loading from main thread)\n                tile_data.uniforms = tile_data.uniforms || {};\n                tile_data.textures = tile_data.textures || [];\n\n                let u_samplers = tile_data.uniforms['u_rasters'] = [];\n                let u_sizes = tile_data.uniforms['u_raster_sizes'] = [];\n                let u_offsets = tile_data.uniforms['u_raster_offsets'] = [];\n\n                textures.forEach(([tname, twidth, theight]) => {\n                    let i = index[tname];\n                    let raster_coords = configs[tname].coords; // tile coords of raster tile\n\n                    u_samplers[i] = tname;\n                    tile_data.textures.push(tname);\n\n                    u_sizes[i] = [twidth, theight];\n\n                    // Tile geometry may be at a higher zoom than the raster tile texture,\n                    // (e.g. an overzoomed raster tile), in which case we need to adjust the\n                    // raster texture UVs to offset to the appropriate starting point for\n                    // this geometry tile.\n                    if (tile.coords.z > raster_coords.z) {\n                        let dz = tile.coords.z - raster_coords.z; // # of levels raster source is overzoomed\n                        let dz2 = Math.pow(2, dz);\n                        u_offsets[i] = [\n                            (tile.coords.x % dz2) / dz2,\n                            (dz2 - 1 - (tile.coords.y % dz2)) / dz2, // GL texture coords are +Y up\n                            1 / dz2\n                        ];\n                    }\n                    else {\n                        u_offsets[i] = [0, 0, 1];\n                    }\n                });\n\n                return tile_data;\n            }\n        );\n    },\n\n    // Called on main thread\n    loadTextures (textures) {\n        // NB: only return name and size of textures loaded, because we can't send actual texture objects to worker\n        return Texture.createFromObject(this.gl, textures)\n            .then(() => {\n                return Promise.all(Object.keys(textures).map(t => {\n                    return Texture.textures[t] && Texture.textures[t].load();\n                }).filter(x => x));\n            })\n            .then(textures => {\n                textures.forEach(t => t.retain());\n                return textures.map(t => [t.name, t.width, t.height]);\n            });\n    },\n\n    // Setup any GL state for rendering\n    setup () {\n        this.setUniforms();\n        this.material.setupProgram(ShaderProgram.current);\n    },\n\n    // Set style uniforms on currently bound program\n    setUniforms () {\n        var program = ShaderProgram.current;\n        if (!program) {\n            return;\n        }\n\n        program.setUniforms(this.shaders && this.shaders.uniforms, true); // reset texture unit to 0\n    },\n\n    // Render state settings by blend mode\n    render_states: {\n        opaque: { depth_test: true, depth_write: true },\n        add: { depth_test: true, depth_write: false },\n        multiply: { depth_test: true, depth_write: false },\n        inlay: { depth_test: true, depth_write: false },\n        overlay: { depth_test: false, depth_write: false }\n    },\n\n    // Default sort order for blend modes\n    default_blend_orders: {\n        opaque: 0,\n        add: 1,\n        multiply: 2,\n        inlay: 3,\n        overlay: 4\n    },\n\n    // Comparison function for sorting styles by blend\n    blendOrderSort (a, b) {\n        // opaque always comes first\n        if (a.blend === 'opaque' || b.blend === 'opaque') {\n            if (a.blend === 'opaque' && b.blend === 'opaque') { // if both are opaque\n                return a.name < b.name ? -1 : 1; // use name as tie breaker\n            }\n            else if (a.blend === 'opaque') {\n                return -1; // only `a` was opaque\n            }\n            else {\n                return 1; // only `b` was opaque\n            }\n        }\n\n        // use explicit blend order if possible\n        if (a.blend_order < b.blend_order) {\n            return -1;\n        }\n        else if (a.blend_order > b.blend_order) {\n            return 1;\n        }\n\n        // if blend orders are equal, use default order by blend mode\n        if (Style.default_blend_orders[a.blend] < Style.default_blend_orders[b.blend]) {\n            return -1;\n        }\n        else if (Style.default_blend_orders[a.blend] > Style.default_blend_orders[b.blend]) {\n            return 1;\n        }\n\n        return a.name < b.name ? -1 : 1; // use name as tie breaker\n    }\n\n};\n",
     "// Manage rendering styles\nimport ShaderProgram from '../gl/shader_program';\nimport mergeObjects from '../utils/merge';\nimport Geo from '../geo';\nimport log from '../utils/log';\n\nimport {Polygons} from './polygons/polygons';\nimport {Lines} from './lines/lines';\nimport {Points} from './points/points';\nimport {TextStyle} from './text/text';\nimport {RasterStyle} from './raster/raster';\n\nlet fs = require('fs');\nconst shaderSrc_accessors = fs.readFileSync(__dirname + '/../gl/shaders/accessors.glsl', 'utf8');\nconst shaderSrc_layerOrder = fs.readFileSync(__dirname + '/../gl/shaders/layer_order.glsl', 'utf8');\nconst shaderSrc_selectionGlobals = fs.readFileSync(__dirname + '/../gl/shaders/selection_globals.glsl', 'utf8');\nconst shaderSrc_selectionVertex = fs.readFileSync(__dirname + '/../gl/shaders/selection_vertex.glsl', 'utf8');\n\nexport class StyleManager {\n\n    constructor () {\n        this.styles = {};\n        this.base_styles = {};\n\n        // Add built-in rendering styles\n        this.register(Object.create(Polygons));\n        this.register(Object.create(Lines));\n        this.register(Object.create(Points));\n        this.register(Object.create(TextStyle));\n        this.register(Object.create(RasterStyle));\n    }\n\n    // Global configuration for all styles\n    init () {\n        ShaderProgram.removeBlock('global');\n        ShaderProgram.removeBlock('setup');\n\n        // Model and world position accessors\n        ShaderProgram.addBlock('global', shaderSrc_accessors);\n\n        // Layer re-ordering function\n        ShaderProgram.addBlock('global', shaderSrc_layerOrder);\n\n        // Feature selection global\n        ShaderProgram.addBlock('global', shaderSrc_selectionGlobals);\n\n        // Feature selection vertex shader support\n        ShaderProgram.replaceBlock('setup', shaderSrc_selectionVertex);\n\n        // Minimum value for float comparisons\n        ShaderProgram.defines.TANGRAM_EPSILON = 0.00001;\n\n        // Minimum depth buffer value separating each `order` unit\n        // Assume min 16-bit depth buffer, in practice uses 14-bits, 1 extra bit to handle virtual half-layers\n        // for outlines (inserted in between layers), another extra bit to prevent precision loss\n        ShaderProgram.defines.TANGRAM_LAYER_DELTA = 1 / (1 << 14);\n\n        // Internal tile scale\n        ShaderProgram.defines.TANGRAM_TILE_SCALE =\n            `vec3(${Geo.tile_scale}., ${Geo.tile_scale}., u_meters_per_pixel * ${Geo.tile_size}.)`;\n\n        // Increases precision for height values\n        ShaderProgram.defines.TANGRAM_HEIGHT_SCALE = Geo.height_scale;\n    }\n\n    // Destroy all styles for a given GL context\n    destroy (gl) {\n        Object.keys(this.styles).forEach((_name) => {\n            let style = this.styles[_name];\n            if (style.gl === gl) {\n                log('trace', `StyleManager.destroy: destroying render style ${style.name}`);\n\n                if (style.base) {\n                    this.remove(style.name);\n                }\n                style.destroy();\n            }\n        });\n    }\n\n    // Register a style\n    register (style) {\n        this.styles[style.name] = style;\n        this.base_styles[style.name] = style;\n    }\n\n    // Remove a style\n    remove (name) {\n        delete this.styles[name];\n    }\n\n    mix (style, styles) {\n        // Exit early if we have already applied mixins to this style\n        if (style.mixed) {\n            return style;\n        }\n        style.mixed = {};\n\n        // Mixin sources, in order\n        let sources = [];\n        if (style.mix) {\n            if (Array.isArray(style.mix)) {\n                sources.push(...style.mix);\n            }\n            else {\n                sources.push(style.mix);\n            }\n            sources = sources.map(x => styles[x]).filter(x => x && x !== style); // TODO: warning on trying to mix into self\n\n            // Track which styles were mixed into this one\n            sources.forEach(s => style.mixed[s.name] = true);\n        }\n        sources.push(style);\n\n        // Flags - OR'd, true if any style has it set\n        style.animated = sources.some(x => x && x.animated);\n        style.texcoords = sources.some(x => x && x.texcoords);\n\n        // Overwrites - last definition wins\n        style.base = sources.map(x => x.base).filter(x => x).pop();\n        style.lighting = sources.map(x => x.lighting).filter(x => x != null).pop();\n        style.texture = sources.map(x => x.texture).filter(x => x).pop();\n        style.raster = sources.map(x => x.raster).filter(x => x != null).pop();\n        style.dash = sources.map(x => x.dash).filter(x => x != null).pop();\n        style.dash_background_color = sources.map(x => x.dash_background_color).filter(x => x != null).pop();\n        if (sources.some(x => x.hasOwnProperty('blend') && x.blend)) {\n            // only mix blend if explicitly set, otherwise let base style choose blending mode\n            // hasOwnProperty check gives preference to base style prototype\n            style.blend = sources.map(x => x.hasOwnProperty('blend') && x.blend).filter(x => x).pop();\n        }\n        style.blend_order = sources.map(x => x.blend_order).filter(x => x != null).pop();\n\n        // Merges - property-specific rules for merging values\n        style.defines = Object.assign({}, ...sources.map(x => x.defines).filter(x => x)); // internal defines (not user-defined)\n        style.material = Object.assign({}, ...sources.map(x => x.material).filter(x => x));\n\n        let draws = sources.map(x => x.draw).filter(x => x); // draw defaults\n        if (draws.length > 0) {\n            style.draw = mergeObjects({}, ...draws);\n        }\n\n        // Mix shader properties\n        this.mixShaders(style, styles, sources);\n        return style;\n    }\n\n    // Mix the propertes in the \"shaders\" block\n    mixShaders (style, styles, sources) {\n        let shaders = {}; // newly mixed shaders properties\n        let shader_merges = sources.map(x => x.shaders).filter(x => x); // just the source styles with shader properties\n\n        // Defines\n        shaders.defines = Object.assign({}, ...shader_merges.map(x => x.defines).filter(x => x));\n\n        // Uniforms\n        shaders.uniforms = {};  // uniforms for this style, both explicitly defined, and mixed from other styles\n        shaders._uniforms = (style.shaders && style.shaders.uniforms) || {}; // uniforms explicitly defined by *this* style\n        shaders._uniform_scopes = {}; // tracks which style each uniform originated from (this one, or ancestor)\n\n        // Mix in uniforms from ancestors, providing means to access\n        sources\n            .filter(x => x.shaders && x.shaders.uniforms)\n            .forEach(x => {\n                for (let u in x.shaders.uniforms) {\n                    shaders._uniform_scopes[u] = x.name;\n\n                    // Define getter and setter for this uniform\n                    // Getter returns value for this style if present, otherwise asks appropriate ancestor for it\n                    // Setter sets the value for this style (whether previously present in this style or not)\n                    // Mimics JS prototype/hasOwnProperty behavior, but with multiple ancestors (via mixins)\n                    Object.defineProperty(shaders.uniforms, u, {\n                        enumerable: true,\n                        configurable: true,\n                        get: function () {\n                            // Uniform is explicitly defined on this style\n                            if (shaders._uniforms[u] !== undefined) {\n                                return shaders._uniforms[u];\n                            }\n                            // Uniform was mixed from another style, forward request there\n                            // Identify check is needed to prevent infinite recursion if a previously defined uniform\n                            // is set to undefined\n                            else if (styles[shaders._uniform_scopes[u]].shaders.uniforms !== shaders.uniforms) {\n                                return styles[shaders._uniform_scopes[u]].shaders.uniforms[u];\n                            }\n                        },\n                        set: function (v) {\n                            shaders._uniforms[u] = v;\n                        }\n                    });\n                }\n            });\n\n        // Extensions: build a list of unique extensions\n        shaders.extensions = Object.keys(shader_merges\n            .map(x => x.extensions)\n            .filter(x => x)\n            .reduce((prev, cur) => {\n                // single extension\n                if (typeof cur === 'string') {\n                    prev[cur] = true;\n                }\n                // array of extensions\n                else {\n                    cur.forEach(x => prev[x] = true);\n                }\n                return prev;\n            }, {}) || {}\n        );\n\n        // Shader blocks\n        // Mark all shader blocks for the target style as originating with its own name\n        if (style.shaders && style.shaders.blocks) {\n            style.shaders.block_scopes = style.shaders.block_scopes || {};\n            for (let k in style.shaders.blocks) {\n                let block = style.shaders.blocks[k];\n                style.shaders.block_scopes[k] = style.shaders.block_scopes[k] || [];\n                if (Array.isArray(block)) {\n                    style.shaders.block_scopes[k].push(...block.map(() => style.name));\n                }\n                else {\n                    style.shaders.block_scopes[k].push(style.name);\n                }\n            }\n        }\n\n        // Merge shader blocks, keeping track of which style each block originated from\n        let mixed = {}; // all scopes mixed so far\n        shader_merges.forEach(source => {\n            if (!source.blocks) {\n                return;\n            }\n\n            shaders.blocks = shaders.blocks || {};\n            shaders.block_scopes = shaders.block_scopes || {};\n            let mixed_source = {}; // scopes mixed for this source style\n\n            for (let t in source.blocks) {\n                let block = source.blocks[t];\n                let block_scope = source.block_scopes[t];\n\n                shaders.blocks[t] = shaders.blocks[t] || [];\n                shaders.block_scopes[t] = shaders.block_scopes[t] || [];\n\n                // standardize on arrays (block can be single or multi-value)\n                block = Array.isArray(block) ? block : [block];\n                block_scope = Array.isArray(block_scope) ? block_scope : [block_scope];\n\n                for (let b=0; b < block.length; b++) {\n                    // Skip blocks we've already mixed in from the same scope\n                    // Repeating scope indicates a diamond pattern where a style is being mixed multiple times\n                    if (mixed[block_scope[b]]) {\n                        continue;\n                    }\n                    mixed_source[block_scope[b]] = true;\n\n                    shaders.blocks[t].push(block[b]);\n                    shaders.block_scopes[t].push(block_scope[b]);\n                }\n            }\n\n            // Add styles mixed in from this source - they could be multi-level ancestors,\n            // beyond the first-level \"parents\" defined in this style's `mix` list\n            Object.assign(mixed, mixed_source);\n        });\n\n        Object.assign(style.mixed, mixed); // add all newly mixed styles\n\n        style.shaders = shaders; // assign back to style\n        return style;\n    }\n\n    // Create a new style\n    // name: name of new style\n    // config: properties of new style\n    // styles: working set of styles being built (used for mixing in existing styles)\n    create (name, config, styles = {}) {\n        let style = mergeObjects({}, config); // deep copy\n        style.name = name;\n\n        // Style mixins\n        style = this.mix(style, styles);\n\n        // Has base style?\n        // Only renderable (instantiated) styles should be included for run-time use\n        // Others are intermediary/abstract, used during style composition but not execution\n        if (style.base && this.base_styles[style.base]) {\n            this.styles[name] = style = Object.assign(Object.create(this.base_styles[style.base]), style);\n        }\n        else {\n            style.base = null; // null out invalid base style\n        }\n\n        return style;\n    }\n\n    // Called to create and initialize styles\n    build (styles) {\n        // Sort styles by dependency, then build them\n        let style_deps = Object.keys(styles).sort(\n            (a, b) => this.inheritanceDepth(a, styles) - this.inheritanceDepth(b, styles)\n        );\n\n        // Only keep built-in base styles\n        for (let sname in this.styles) {\n            if (!this.base_styles[sname]) {\n                delete this.styles[sname];\n            }\n            else {\n                this.styles[sname].reset();\n            }\n        }\n\n        // Working set of styles being built\n        let ws = {};\n        style_deps.forEach(sname => {\n            ws[sname] = this.create(sname, styles[sname], ws);\n        });\n\n        return this.styles;\n    }\n\n    // Initialize all styles\n    initStyles (scene = {}) {\n        // Initialize all\n        for (let sname in this.styles) {\n            this.styles[sname].init(scene);\n        }\n    }\n\n    // Given a style key in a set of styles to add, count the length of the inheritance chain\n    inheritanceDepth (key, styles) {\n        let parents = 0;\n\n        while(true) {\n            let style = styles[key];\n            if (!style) {\n                // this is a scene def error, trying to extend a style that doesn't exist\n                break;\n            }\n\n            // Dependency chain ends when this style isn't mixing in any others\n            if (!style.mix) {\n                break;\n            }\n\n            // Traverse next parent style\n            parents++;\n\n            if (Array.isArray(style.mix)) {\n                // If multiple mixins, find the deepest one\n                parents += Math.max(...style.mix.map(s => {\n                    // Trying to mix into itself!\n                    if (key === s) {\n                        return;\n                    }\n\n                    return this.inheritanceDepth(s, styles);\n                }));\n                break;\n            }\n            else {\n                // Trying to mix into itself!\n                if (key === style.mix) {\n                    break;\n                }\n\n                // If single mixin, continue loop up the tree\n                key = style.mix;\n            }\n        }\n        return parents;\n    }\n\n}\n",
     "import Utils from '../utils/utils';\nimport Geo from '../geo';\n\nimport parseCSSColor from 'csscolorparser';\n\nexport var StyleParser = {};\n\n// Wraps style functions and provides a scope of commonly accessible data:\n// - feature: the 'properties' of the feature, e.g. accessed as 'feature.name'\n// - global: user-defined properties on the `global` object in the scene file\n// - $zoom: the current map zoom level\n// - $geometry: the type of geometry, 'point', 'line', or 'polygon'\n// - $meters_per_pixel: conversion for meters/pixels at current map zoom\nStyleParser.wrapFunction = function (func) {\n    var f = `\n        var feature = context.feature.properties;\n        var global = context.global;\n        var $zoom = context.zoom;\n        var $layer = context.layer;\n        var $geometry = context.geometry;\n        var $meters_per_pixel = context.meters_per_pixel;\n\n        var val = (function(){ ${func} }());\n\n        if (typeof val === 'number' && isNaN(val)) {\n            val = null; // convert NaNs to nulls\n        }\n\n        return val;\n    `;\n    return f;\n};\n\n\n// Style parsing\n\nStyleParser.zeroPair = Object.freeze([0, 0]); // single allocation for zero values that won't be modified\n\n// Style defaults\nStyleParser.defaults = {\n    color: [1, 1, 1, 1],\n    width: 1,\n    size: 1,\n    extrude: false,\n    height: 20,\n    min_height: 0,\n    order: 0,\n    z: 0,\n    outline: {\n        color: [0, 0, 0, 0],\n        width: 0\n    },\n    material: {\n        ambient: 1,\n        diffuse: 1\n    }\n};\n\n// Style macros\nStyleParser.macros = {\n    // pseudo-random color by geometry id\n    'Style.color.pseudoRandomColor': function() {\n        return [\n            0.7 * (parseInt(feature.id, 16) / 100 % 1),     // jshint ignore:line\n            0.7 * (parseInt(feature.id, 16) / 10000 % 1),   // jshint ignore:line\n            0.7 * (parseInt(feature.id, 16) / 1000000 % 1), // jshint ignore:line\n            1\n        ];\n    },\n\n    // random color\n    'Style.color.randomColor': function() {\n        return [0.7 * Math.random(), 0.7 * Math.random(), 0.7 * Math.random(), 1];\n    }\n};\n\n// A context object that is passed to style parsing functions to provide a scope of commonly used values\nStyleParser.getFeatureParseContext = function (feature, tile, global) {\n    return {\n        feature,\n        tile,\n        global,\n        zoom: tile.style_zoom,\n        geometry: Geo.geometryType(feature.geometry.type),\n        meters_per_pixel: tile.meters_per_pixel,\n        meters_per_pixel_sq: tile.meters_per_pixel_sq,\n        units_per_meter_overzoom: tile.units_per_meter_overzoom\n    };\n};\n\n// Build a style param cache object\n// `value` is raw value, cache methods will add other properties as needed\n// `transform` is optional transform function to run on values (except function values)\nStyleParser.createPropertyCache = function (obj, transform = null) {\n    if (obj == null) {\n        return;\n    }\n\n    if (obj.value) {\n        return { value: obj.value, zoom: (obj.zoom ? {} : null) }; // clone existing cache object\n    }\n\n    let c = { value: obj };\n\n    // does value contain zoom stops to be interpolated?\n    if (Array.isArray(c.value) && Array.isArray(c.value[0])) {\n        c.zoom = {}; // will hold values interpolated by zoom\n    }\n\n    // apply optional transform function\n    if (typeof transform === 'function') {\n        if (c.zoom) { // apply to each zoom stop value\n            c.value = c.value.map(v => [v[0], transform(v[1])]);\n        }\n        else if (typeof c.value !== 'function') { // don't transform functions\n            c.value = transform(c.value); // single value\n        }\n    }\n\n    return c;\n};\n\n// Convert old-style color macro into a function\n// TODO: deprecate this macro syntax\nStyleParser.createColorPropertyCache = function (obj) {\n    return StyleParser.createPropertyCache(obj, v => {\n        if (v === 'Style.color.pseudoRandomColor') {\n            return Utils.stringToFunction(StyleParser.wrapFunction(StyleParser.macros['Style.color.pseudoRandomColor']));\n        }\n        else if (v === 'Style.color.randomColor') {\n            return StyleParser.macros['Style.color.randomColor'];\n        }\n\n        return v;\n    });\n};\n\n// Interpolation and caching for a generic property (not a color or distance)\n// { value: original, static: val, zoom: { 1: val1, 2: val2, ... }, dynamic: function(){...} }\nStyleParser.evalCachedProperty = function(val, context) {\n    if (val == null) {\n        return;\n    }\n    else if (val.dynamic) { // function, compute each time (no caching)\n        let v = val.dynamic(context);\n        return v;\n    }\n    else if (val.static) { // single static value\n        return val.static;\n    }\n    else if (val.zoom && val.zoom[context.zoom]) { // interpolated, cached\n        return val.zoom[context.zoom];\n    }\n    else { // not yet evaulated for cache\n        // Dynamic function-based\n        if (typeof val.value === 'function') {\n            val.dynamic = val.value;\n            let v = val.dynamic(context);\n            return v;\n        }\n        // Array of zoom-interpolated stops, e.g. [zoom, value] pairs\n        else if (Array.isArray(val.value) && Array.isArray(val.value[0])) {\n            // Calculate value for current zoom\n            val.zoom = val.zoom || {};\n            val.zoom = {};\n            val.zoom[context.zoom] = Utils.interpolate(context.zoom, val.value);\n            return val.zoom[context.zoom];\n        }\n        // Single static value\n        else {\n            val.static = val.value;\n            return val.static;\n        }\n    }\n};\n\nStyleParser.convertUnits = function(val, context) {\n    // pre-parsed units\n    if (val.val != null) {\n        if (val.units === 'px') { // convert from pixels\n            return val.val * Geo.metersPerPixel(context.zoom);\n        }\n        return val.val;\n    }\n    // un-parsed unit string\n    else if (typeof val === 'string') {\n        var units = val.match(/([0-9.-]+)([a-z]+)/);\n        if (units && units.length === 3) {\n            val = parseFloat(units[1]);\n            units = units[2];\n        }\n\n        if (units === 'px') { // convert from pixels\n            val *= Geo.metersPerPixel(context.zoom);\n        }\n    }\n    // multiple values or stops\n    else if (Array.isArray(val)) {\n        // Array of arrays, e.g. zoom-interpolated stops\n        if (Array.isArray(val[0])) {\n            return val.map(v => [v[0], StyleParser.convertUnits(v[1], context)]);\n        }\n        // Array of values\n        else {\n            return val.map(v => StyleParser.convertUnits(v, context));\n        }\n    }\n    return val;\n};\n\n// Pre-parse units from string values\nStyleParser.parseUnits = function (val) {\n    var obj = { val: parseFloat(val) };\n    if (obj.val !== 0 && typeof val === 'string' && val.trim().slice(-2) === 'px') {\n        obj.units = 'px';\n    }\n    return obj;\n};\n\n// Takes a distance cache object and returns a distance value for this zoom\n// (caching the result for future use)\n// { value: original, zoom: { z: meters }, dynamic: function(){...} }\nStyleParser.evalCachedDistanceProperty = function(val, context) {\n    if (val.dynamic) {\n        let v = val.dynamic(context);\n        return v;\n    }\n    else if (val.zoom && val.zoom[context.zoom]) {\n        return val.zoom[context.zoom];\n    }\n    else {\n        // Dynamic function-based\n        if (typeof val.value === 'function') {\n            val.dynamic = val.value;\n            let v = val.dynamic(context);\n            return v;\n        }\n        // Array of zoom-interpolated stops, e.g. [zoom, value] pairs\n        else if (val.zoom) {\n            // Calculate value for current zoom\n            // Do final unit conversion as late as possible, when interpolation values have been determined\n            val.zoom[context.zoom] = Utils.interpolate(context.zoom, val.value,\n                v => StyleParser.convertUnits(v, context));\n\n            return val.zoom[context.zoom];\n        }\n        else {\n            return StyleParser.convertUnits(val.value, context);\n        }\n    }\n};\n\n// Cache previously parsed color strings\nStyleParser.string_colors = {};\nStyleParser.colorForString = function(string) {\n    // Cached\n    if (StyleParser.string_colors[string]) {\n        return StyleParser.string_colors[string];\n    }\n\n    // Calculate and cache\n    let color = parseCSSColor.parseCSSColor(string);\n    if (color && color.length === 4) {\n        color[0] /= 255;\n        color[1] /= 255;\n        color[2] /= 255;\n    }\n    else {\n        color = StyleParser.defaults.color;\n    }\n    StyleParser.string_colors[string] = color;\n    return color;\n};\n\n// Takes a color cache object and returns a color value for this zoom\n// (caching the result for future use)\n// { value: original, static: [r,g,b,a], zoom: { z: [r,g,b,a] }, dynamic: function(){...} }\nStyleParser.evalCachedColorProperty = function(val, context = {}) {\n    if (val.dynamic) {\n        let v = val.dynamic(context);\n\n        if (typeof v === 'string') {\n            v = StyleParser.colorForString(v);\n        }\n\n        if (v && v[3] == null) {\n            v[3] = 1; // default alpha\n        }\n        return v;\n    }\n    else if (val.static) {\n        return val.static;\n    }\n    else if (val.zoom && val.zoom[context.zoom]) {\n        return val.zoom[context.zoom];\n    }\n    else {\n        // Dynamic function-based color\n        if (typeof val.value === 'function') {\n            val.dynamic = val.value;\n            let v = val.dynamic(context);\n\n            if (typeof v === 'string') {\n                v = StyleParser.colorForString(v);\n            }\n\n            if (v && v[3] == null) {\n                v[3] = 1; // default alpha\n            }\n            return v;\n        }\n        // Single string color\n        else if (typeof val.value === 'string') {\n            val.static = StyleParser.colorForString(val.value);\n            return val.static;\n        }\n        // Array of zoom-interpolated stops, e.g. [zoom, color] pairs\n        else if (val.zoom) {\n            // Parse any string colors inside stops, the first time we encounter this property\n            if (!val.zoom_preprocessed) {\n                for (let i=0; i < val.value.length; i++) {\n                    let v = val.value[i];\n                    if (v && typeof v[1] === 'string') {\n                        v[1] = StyleParser.colorForString(v[1]);\n                    }\n                }\n                val.zoom_preprocessed = true;\n            }\n\n            // Calculate color for current zoom\n            val.zoom[context.zoom] = Utils.interpolate(context.zoom, val.value);\n            val.zoom[context.zoom][3] = val.zoom[context.zoom][3] || 1; // default alpha\n            return val.zoom[context.zoom];\n        }\n        // Single array color\n        else {\n            val.static = val.value;\n            if (val.static && val.static[3] == null) {\n                val.static[3] = 1; // default alpha\n            }\n            return val.static;\n        }\n    }\n};\n\nStyleParser.parseColor = function(val, context = {}) {\n    if (typeof val === 'function') {\n        val = val(context);\n    }\n\n    // Parse CSS-style colors\n    // TODO: change all colors to use 0-255 range internally to avoid dividing and then re-multiplying in geom builder\n    if (typeof val === 'string') {\n        val = StyleParser.colorForString(val);\n    }\n    else if (Array.isArray(val) && Array.isArray(val[0])) {\n        // Array of zoom-interpolated stops, e.g. [zoom, color] pairs\n        for (let i=0; i < val.length; i++) {\n            let v = val[i];\n            if (typeof v[1] === 'string') {\n                v[1] = StyleParser.colorForString(v[1]);\n            }\n        }\n\n        if (context.zoom) {\n            val = Utils.interpolate(context.zoom, val);\n        }\n    }\n\n    // Defaults\n    if (val) {\n        // alpha\n        if (val[3] == null) {\n            val[3] = 1;\n        }\n    }\n    else {\n        val = [0, 0, 0, 1];\n    }\n\n    return val;\n};\n\nStyleParser.calculateOrder = function(order, context) {\n    // Computed order\n    if (typeof order === 'function') {\n        order = order(context);\n    }\n    else if (typeof order === 'string') {\n        // Order tied to feature property\n        if (context.feature.properties[order]) {\n            order = context.feature.properties[order];\n        }\n        // Explicit order value\n        else {\n            order = parseFloat(order);\n        }\n    }\n\n    return order;\n};\n\n// Evaluate a function-based property, or pass-through static value\nStyleParser.evalProperty = function(prop, context) {\n    if (typeof prop === 'function') {\n        return prop(context);\n    }\n    return prop;\n};\n",
-    "import Utils from '../../utils/utils';\nimport Texture from '../../gl/texture';\nimport FontManager from './font_manager';\nimport debugSettings from '../../utils/debug_settings';\n\nconst codon_length = 2; // length of chunks when breaking up label text\n\nexport default class CanvasText {\n\n    constructor () {\n        this.canvas = document.createElement('canvas');\n        this.canvas.style.backgroundColor = 'transparent'; // render text on transparent background\n        this.context = this.canvas.getContext('2d');\n        this.vertical_text_buffer = 8; // vertical pixel padding around text\n        this.horizontal_text_buffer = 4; // text styling such as italic emphasis is not measured by the Canvas API, so padding is necessary\n    }\n\n    resize (width, height) {\n        this.canvas.width = width;\n        this.canvas.height = height;\n        this.context.clearRect(0, 0, width, height);\n    }\n\n    // Set font style params for canvas drawing\n    setFont ({ font_css, fill, stroke, stroke_width, px_size, supersample }) {\n        this.px_size = px_size;\n        let ctx = this.context;\n        let dpr = Utils.device_pixel_ratio * supersample;\n\n        if (stroke && stroke_width > 0) {\n            ctx.strokeStyle = stroke;\n            ctx.lineWidth = stroke_width * dpr;\n        }\n        ctx.fillStyle = fill;\n\n        ctx.font = font_css;\n        ctx.miterLimit = 2;\n    }\n\n    textSizes (texts) {\n        let dpr;\n        return FontManager.loadFonts().then(() => {\n            for (let style in texts) {\n                CanvasText.text_cache[style] = CanvasText.text_cache[style] || {};\n\n                let text_infos = texts[style];\n                let first = true;\n\n                for (let text in text_infos) {\n                    let text_info = text_infos[text];\n                    let text_settings = text_info.text_settings;\n\n                    if (first) {\n                        this.setFont(text_settings);\n                        dpr = Utils.device_pixel_ratio * text_settings.supersample;\n                        first = false;\n                    }\n\n                    if (text_settings.can_articulate){\n                        let segments = splitLabelText(text);\n\n                        let words = text.split(' ');\n\n                        // RTL is true if every word is RTL\n                        // BIDI is true if there is RTL and LTR\n                        let hasRTL = false;\n                        let hasLTR = false;\n                        let bidi = false;\n                        for (var i = 0; i < words.length; i++){\n                            if (isTextRTL(words[i])) {\n                                if (hasLTR){\n                                    bidi = true;\n                                    break;\n                                }\n                                hasRTL = true;\n                            }\n                            else {\n                                if (hasRTL){\n                                    bidi = true;\n                                    break;\n                                }\n                                hasLTR = true;\n                            }\n                        }\n\n                        let rtl = (hasRTL && !hasLTR) && !bidi;\n                        let shaped = isTextShaped(text);\n\n                        text_info.isRTL = rtl;\n                        text_info.no_curving = bidi || shaped;\n                        text_info.vertical_buffer = this.vertical_text_buffer;\n\n                        if (rtl) {\n                            segments.reverse();\n                        }\n\n                        text_info.segments = segments;\n                        text_info.size = [];\n\n                        for (let i = 0; i < segments.length; i++){\n                            let segment = segments[i];\n                            if (!CanvasText.text_cache[style][segment]) {\n                                CanvasText.text_cache[style][segment] = this.textSize(segment, text_settings);\n                                CanvasText.cache_stats.misses++;\n                            }\n                            else {\n                                CanvasText.cache_stats.hits++;\n                            }\n                            text_info.size.push(CanvasText.text_cache[style][segment].size);\n                        }\n\n                        // add full text as well\n                        if (!CanvasText.text_cache[style][text]) {\n                            CanvasText.text_cache[style][text] = this.textSize(text, text_settings);\n                            CanvasText.cache_stats.misses++;\n                        }\n                        else {\n                            CanvasText.cache_stats.hits++;\n                        }\n                        text_info.total_size = CanvasText.text_cache[style][text].size;\n                    }\n                    else {\n                        if (!CanvasText.text_cache[style][text]) {\n                            CanvasText.text_cache[style][text] = this.textSize(text, text_settings);\n                            CanvasText.cache_stats.misses++;\n                        }\n                        else {\n                            CanvasText.cache_stats.hits++;\n                        }\n                        // Only send text sizes back to worker (keep computed text line info\n                        // on main thread, for future rendering)\n                        text_info.size = CanvasText.text_cache[style][text].size;\n                    }\n                }\n            }\n\n            return texts;\n        });\n    }\n\n    // Computes width and height of text based on current font style\n    // Includes word wrapping, returns size info for whole text block and individual lines\n    textSize (text, {transform, text_wrap, max_lines, stroke_width = 0, supersample}) {\n        let dpr = Utils.device_pixel_ratio * supersample;\n        let str = this.applyTextTransform(text, transform);\n        let ctx = this.context;\n        let vertical_buffer = this.vertical_text_buffer * dpr;\n        let horizontal_buffer = dpr * (stroke_width + this.horizontal_text_buffer);\n        let leading = 2 * dpr; // make configurable and/or use Canvas TextMetrics when available\n        let line_height = this.px_size + leading; // px_size already in device pixels\n\n        // Parse string into series of lines if it exceeds the text wrapping value or contains line breaks\n        let multiline = MultiLine.parse(str, text_wrap, max_lines, line_height, ctx);\n\n        // Final dimensions of text\n        let height = multiline.height;\n        let width = multiline.width;\n        let lines = multiline.lines;\n\n        let collision_size = [\n            width / dpr,\n            height / dpr\n        ];\n\n        let texture_size = [\n            width + 2 * horizontal_buffer,\n            height + 2 * vertical_buffer\n        ];\n\n        let logical_size = [\n            texture_size[0] / dpr,\n            texture_size[1] / dpr,\n        ];\n\n        // Returns lines (w/per-line info for drawing) and text's overall bounding box + canvas size\n        return {\n            lines,\n            size: { collision_size, texture_size, logical_size, line_height }\n        };\n    }\n\n    // Draw multiple lines of text\n    drawTextMultiLine (lines, [x, y], size, { stroke, stroke_width = 0, transform, align, supersample }, type) {\n        let line_height = size.line_height;\n        let height = y;\n        for (let line_num=0; line_num < lines.length; line_num++) {\n            let line = lines[line_num];\n            this.drawTextLine(line, [x, height], size, { stroke, stroke_width, transform, align, supersample }, type);\n            height += line_height;\n        }\n\n        // Draw bounding boxes for debugging\n        if (debugSettings.draw_label_collision_boxes) {\n            this.context.save();\n\n            let dpr = Utils.device_pixel_ratio * supersample;\n            let horizontal_buffer = dpr * (this.horizontal_text_buffer + stroke_width);\n            let vertical_buffer = dpr * this.vertical_text_buffer;\n            let collision_size = size.collision_size;\n            let lineWidth = 2;\n\n            this.context.strokeStyle = 'blue';\n            this.context.lineWidth = lineWidth;\n            this.context.strokeRect(x + horizontal_buffer, y + vertical_buffer, dpr * collision_size[0], dpr * collision_size[1]);\n            if (type === 'curved'){\n                this.context.strokeRect(x + size.texture_size[0] + horizontal_buffer, y + vertical_buffer, dpr * collision_size[0], dpr * collision_size[1]);\n            }\n\n            this.context.restore();\n        }\n\n        if (debugSettings.draw_label_texture_boxes) {\n            this.context.save();\n\n            let texture_size = size.texture_size;\n            let lineWidth = 2;\n\n            this.context.strokeStyle = 'green';\n            this.context.lineWidth = lineWidth;\n            // stroke is applied internally, so the outer border is the edge of the texture\n            this.context.strokeRect(x + lineWidth, y + lineWidth, texture_size[0] - 2 * lineWidth, texture_size[1] - 2 * lineWidth);\n\n            if (type === 'curved'){\n                this.context.strokeRect(x + lineWidth + size.texture_size[0], y + lineWidth, texture_size[0] - 2 * lineWidth, texture_size[1] - 2 * lineWidth);\n            }\n\n            this.context.restore();\n        }\n    }\n\n    // Draw single line of text at specified location, adjusting for buffer and baseline\n    drawTextLine (line, [x, y], size, { stroke, stroke_width = 0, transform, align, supersample }, type) {\n        let dpr = Utils.device_pixel_ratio * supersample;\n        align = align || 'center';\n\n        let vertical_buffer = this.vertical_text_buffer * dpr;\n        let texture_size = size.texture_size;\n        let line_height = size.line_height;\n        let horizontal_buffer = dpr * (stroke_width + this.horizontal_text_buffer);\n\n        let str = this.applyTextTransform(line.text, transform);\n\n        // Text alignment\n        let tx;\n        if (align === 'left') {\n            tx = x + horizontal_buffer;\n        }\n        else if (align === 'center') {\n            tx = x + texture_size[0]/2 - line.width/2;\n        }\n        else if (align === 'right') {\n            tx = x + texture_size[0] - line.width - horizontal_buffer;\n        }\n\n        // In the absence of better Canvas TextMetrics (not supported by browsers yet),\n        // 0.75 buffer produces a better approximate vertical centering of text\n        let ty = y + vertical_buffer * 0.75 + line_height;\n\n        if (stroke && stroke_width > 0) {\n            let shift = (type === 'curved') ? texture_size[0] : 0;\n            this.context.strokeText(str, tx + shift, ty);\n        }\n        this.context.fillText(str, tx, ty);\n    }\n\n    rasterize (texts, texture_size, tile_key) {\n        for (let style in texts) {\n            let text_infos = texts[style];\n            let first = true;\n\n            for (let text in text_infos) {\n                let text_info = text_infos[text];\n                let text_settings = text_info.text_settings;\n\n                // set font on first occurence of new font style\n                if (first) {\n                    this.setFont(text_settings);\n                    first = false;\n                }\n\n                if (text_settings.can_articulate){\n                    let words = text_info.segments;\n\n                    text_info.texcoords = {};\n                    for (let i = 0; i < text_info.type.length; i++){\n\n                        let type = text_info.type[i];\n                        switch (type){\n                            case 'straight':\n                                let word = words.reduce((text_info.isRTL) ? reduceLeft : reduceRight);\n                                let texcoord;\n\n                                if (CanvasText.texcoord_cache[tile_key][style][word].texcoord){\n                                    texcoord = CanvasText.texcoord_cache[tile_key][style][word].texcoord;\n                                }\n                                else {\n                                    let texture_position = CanvasText.texcoord_cache[tile_key][style][word].texture_position;\n                                    let size = CanvasText.text_cache[style][word].size;\n                                    let line = CanvasText.text_cache[style][word].lines;\n\n                                    this.drawTextMultiLine(line, texture_position, size, text_settings, type);\n\n                                    texcoord = Texture.getTexcoordsForSprite(\n                                        texture_position,\n                                        size.texture_size,\n                                        texture_size\n                                    );\n\n                                    CanvasText.texcoord_cache[tile_key][style][word].texcoord = texcoord;\n                                }\n\n                                text_info.texcoords[type] = texcoord;\n                                break;\n                            case 'curved':\n                                text_info.texcoords.curved = [];\n                                text_info.texcoords_stroke = [];\n                                for (let i = 0; i < words.length; i++){\n                                    let word = words[i];\n                                    let texcoord;\n                                    let texcoord_stroke;\n\n                                    if (CanvasText.texcoord_cache[tile_key][style][word].texcoord){\n                                        texcoord = CanvasText.texcoord_cache[tile_key][style][word].texcoord;\n                                        texcoord_stroke = CanvasText.texcoord_cache[tile_key][style][word].texcoord_stroke;\n\n                                        text_info.texcoords_stroke.push(texcoord_stroke);\n                                    }\n                                    else {\n                                        let texture_position = CanvasText.texcoord_cache[tile_key][style][word].texture_position;\n                                        let size = CanvasText.text_cache[style][word].size;\n                                        let line = CanvasText.text_cache[style][word].lines;\n\n                                        this.drawTextMultiLine(line, texture_position, size, text_settings, type);\n\n                                        texcoord = Texture.getTexcoordsForSprite(\n                                            texture_position,\n                                            size.texture_size,\n                                            texture_size\n                                        );\n\n                                        let texture_position_stroke = [\n                                            texture_position[0] + size.texture_size[0],\n                                            texture_position[1]\n                                        ];\n\n                                        texcoord_stroke = Texture.getTexcoordsForSprite(\n                                            texture_position_stroke,\n                                            size.texture_size,\n                                            texture_size\n                                        );\n\n                                        CanvasText.texcoord_cache[tile_key][style][word].texcoord = texcoord;\n                                        CanvasText.texcoord_cache[tile_key][style][word].texcoord_stroke = texcoord_stroke;\n\n                                        text_info.texcoords_stroke.push(texcoord_stroke);\n                                    }\n\n                                    text_info.texcoords.curved.push(texcoord);\n                                }\n                                break;\n                        }\n                    }\n                }\n                else {\n                    let lines = CanvasText.text_cache[style][text].lines; // get previously computed lines of text\n                    for (let align in text_info.align) {\n                        this.drawTextMultiLine(lines, text_info.align[align].texture_position, text_info.size, {\n                            stroke: text_settings.stroke,\n                            stroke_width: text_settings.stroke_width,\n                            transform: text_settings.transform,\n                            supersample: text_settings.supersample,\n                            align: align\n                        });\n\n                        text_info.align[align].texcoords = Texture.getTexcoordsForSprite(\n                            text_info.align[align].texture_position,\n                            text_info.size.texture_size,\n                            texture_size\n                        );\n                    }\n                }\n            }\n        }\n    }\n\n    // Place text labels within an atlas of the given max size\n    setTextureTextPositions (texts, max_texture_size, tile_key) {\n        if (!CanvasText.texcoord_cache[tile_key]) {\n            CanvasText.texcoord_cache[tile_key] = {};\n        }\n\n        // Keep track of column width\n        let column_width = 0;\n\n        // Layout labels, stacked in columns\n        let cx = 0, cy = 0; // current x/y position in atlas\n        let height = 0;     // overall atlas height\n        for (let style in texts) {\n            if (!CanvasText.texcoord_cache[tile_key][style]) {\n               CanvasText.texcoord_cache[tile_key][style] = {};\n            }\n\n            let text_infos = texts[style];\n\n            for (let text in text_infos) {\n                let text_info = text_infos[text];\n\n                if (text_info.text_settings.can_articulate){\n                    let texture_position;\n\n                    for (let i = 0; i < text_info.type.length; i++){\n                        let type = text_info.type[i];\n                        switch (type){\n                            case 'straight':\n                                let size = text_info.total_size.texture_size;\n                                let word = text_info.segments.reduce((text_info.isRTL) ? reduceLeft : reduceRight);\n\n                                if (size[0] > column_width) {\n                                    column_width = size[0];\n                                }\n                                if (cy + size[1] < max_texture_size) {\n                                    texture_position = [cx, cy];\n\n                                    cy += size[1];\n                                    if (cy > height) {\n                                        height = cy;\n                                    }\n                                }\n                                else { // start new column if taller than texture\n                                    cx += column_width;\n                                    column_width = 0;\n                                    cy = 0;\n                                    texture_position = [cx, cy];\n                                }\n\n                                CanvasText.texcoord_cache[tile_key][style][word] = {\n                                    texture_position: texture_position\n                                };\n                                break;\n                            case 'curved':\n                                for (let i = 0; i < text_info.size.length; i++) {\n                                    let word = text_info.segments[i];\n\n                                    if (!CanvasText.texcoord_cache[tile_key][style][word]) {\n\n                                        let size = text_info.size[i].texture_size;\n                                        let width = 2 * size[0];\n                                        if (width > column_width) {\n                                            column_width = width;\n                                        }\n                                        if (cy + size[1] < max_texture_size) {\n                                            texture_position = [cx, cy];\n\n                                            cy += size[1];\n                                            if (cy > height) {\n                                                height = cy;\n                                            }\n                                        }\n                                        else { // start new column if taller than texture\n                                            cx += column_width;\n                                            column_width = 0;\n                                            cy = 0;\n                                            texture_position = [cx, cy];\n                                        }\n\n                                        CanvasText.texcoord_cache[tile_key][style][word] = {\n                                            texture_position: texture_position\n                                        };\n                                    }\n                                }\n                                break;\n                        }\n                    }\n                }\n                else {\n                    // rendered size is same for all alignments\n                    let size = text_info.size.texture_size;\n                    if (size[0] > column_width) {\n                        column_width = size[0];\n                    }\n\n                    // but each alignment needs to be rendered separately\n                    for (let align in text_info.align) {\n                        if (cy + size[1] < max_texture_size) {\n                            text_info.align[align].texture_position = [cx, cy]; // add label to current column\n                            cy += size[1];\n                            if (cy > height) {\n                                height = cy;\n                            }\n                        }\n                        else { // start new column if taller than texture\n                            cx += column_width;\n                            column_width = 0;\n                            cy = 0;\n                            text_info.align[align].texture_position = [cx, cy];\n                        }\n                    }\n                }\n            }\n        }\n\n        return [cx + column_width, height]; // overall atlas size\n    }\n\n    // Called before rasterization\n    applyTextTransform (text, transform) {\n        if (transform === 'capitalize') {\n            return text.replace(/\\w\\S*/g, function (txt) {\n                return txt.charAt(0).toUpperCase() + txt.substr(1);\n            });\n        }\n        else if (transform === 'uppercase') {\n            return text.toUpperCase();\n        }\n        else if (transform === 'lowercase') {\n            return text.toLowerCase();\n        }\n        return text;\n    }\n\n    // Convert font CSS-style size ('12px', '14pt', '1.5em', etc.) to pixel size (adjusted for device pixel ratio)\n    // Defaults units to pixels if not specified\n    static fontPixelSize (size) {\n        if (size == null) {\n            return;\n        }\n        size = (typeof size === 'string') ? size : String(size); // need a string for regex\n\n        let [, px_size, units] = size.match(CanvasText.font_size_re) || [];\n        units = units || 'px';\n\n        if (units === \"em\") {\n            px_size *= 16;\n        } else if (units === \"pt\") {\n            px_size /= 0.75;\n        } else if (units === \"%\") {\n            px_size /= 6.25;\n        }\n\n        px_size = parseFloat(px_size);\n        px_size *= Utils.device_pixel_ratio;\n        return px_size;\n    }\n\n    clearTexcoordCache (tile_key) {\n        CanvasText.texcoord_cache[tile_key] = {};\n    }\n\n}\n\n// Extract font size and units\nCanvasText.font_size_re = /((?:[0-9]*\\.)?[0-9]+)\\s*(px|pt|em|%)?/;\n\n// Cache sizes of rendered text\nCanvasText.text_cache = {}; // by text style, then text string\nCanvasText.cache_stats = { hits: 0, misses: 0 };\nCanvasText.texcoord_cache = {};\n\nfunction reduceLeft (prev, next){ return next + prev; }\nfunction reduceRight (prev, next){ return prev + next; }\n\n// Contextual Shaping Languages - Unicode ranges\nconst context_langs = {\n    Arabic: \"\\u0600-\\u06FF\",\n    Bengali: \"\\u0980-\\u09FF\",\n    Burmese: \"\\u1000-\\u109F\",\n    Devanagari: \"\\u0900-\\u097F\",\n    Khmer: \"\\u1780-\\u17FF\",\n    Gujarati: \"\\u0A80-\\u0AFF\",\n    Gurmukhi: \"\\u0A00-\\u0A7F\",\n    Kannada: \"\\u0C80-\\u0CFF\",\n    Lao: \"\\u0E80-\\u0EFF\",\n    Mongolian: \"\\u1800-\\u18AF\",\n    Oriya: \"\\u0B00-\\u0B7F\",\n    Tamil: \"\\u0B80-\\u0BFF\",\n    Telugu: \"\\u0C00-\\u0C7F\",\n    Tibetan: \"\\u0F00-\\u0FFF\"\n};\n\nlet reg_ex_shaping = '[';\nfor (let key in context_langs){\n    reg_ex_shaping += context_langs[key];\n}\nreg_ex_shaping += ']';\n\nlet shaping_test = new RegExp(reg_ex_shaping);\n\nfunction isTextShaped(s){\n    return shaping_test.test(s);\n}\n\n// Right-to-left / bi-directional text handling\n// Taken from http://stackoverflow.com/questions/12006095/javascript-how-to-check-if-character-is-rtl\nlet rtlDirCheck = new RegExp('^[\\u0000-\\u0040\\u005B-\\u0060\\u007B-\\u00BF\\u00D7\\u00F7\\u02B9-\\u02FF\\u2000-\\u2BFF\\u2010-\\u2029\\u202C\\u202F-\\u2BFF\\u0591-\\u07FF\\u200F\\u202B\\u202E\\uFB1D-\\uFDFD\\uFE70-\\uFEFC]+$');\nfunction isTextRTL(s){\n    return rtlDirCheck.test(s);\n}\n\n// Splitting strategy for chopping a label into segments\nfunction splitLabelText(text){\n    if (text.length < codon_length) {\n        return [text];\n    }\n\n    let segments = [];\n\n    while (text.length){\n        let segment = text.substring(0, codon_length);\n\n        if (segment.length <= Math.floor(0.5 * codon_length)) {\n            segments[segments.length - 1] += segment;\n        }\n        else {\n            segments.push(segment);\n        }\n\n        text = text.substring(codon_length);\n    }\n\n    return segments;\n}\n\n// Private class to arrange text labels into multiple lines based on\n// \"text wrap\" and \"max line\" values\nclass MultiLine {\n    constructor (context, max_lines = Infinity, text_wrap = Infinity) {\n        this.width = 0;\n        this.height = 0;\n        this.lines = [];\n\n        this.ellipsis = '...';\n        this.ellipsis_width = Math.ceil(context.measureText(this.ellipsis).width);\n\n        this.max_lines = max_lines;\n        this.text_wrap = text_wrap;\n        this.context = context;\n    }\n\n    createLine (line_height){\n        if (this.lines.length < this.max_lines){\n            return new Line(line_height, this.text_wrap);\n        }\n        else {\n            return false;\n        }\n    }\n\n    push (line){\n        if (this.lines.length < this.max_lines){\n            // measure line width\n            let line_width = this.context.measureText(line.text).width;\n            line.width = line_width;\n\n            if (line_width > this.width){\n                this.width = Math.ceil(line_width);\n            }\n\n            // add to lines and increment height\n            this.lines.push(line);\n            this.height += line.height;\n            return true;\n        }\n        else {\n            this.addEllipsis();\n            return false;\n        }\n    }\n\n    // pushes to the lines array and returns a new line if possible (false otherwise)\n    advance (line, line_height) {\n        let can_push = this.push(line);\n        if (can_push){\n            return this.createLine(line_height);\n        }\n        else {\n            return false;\n        }\n    }\n\n    addEllipsis (){\n        let last_line = this.lines[this.lines.length - 1];\n\n        last_line.append(this.ellipsis);\n        last_line.width += this.ellipsis_width;\n\n        if (last_line.width > this.width) {\n            this.width = last_line.width;\n        }\n    }\n\n    finish (line){\n        if (line){\n            this.push(line);\n        }\n        else {\n            this.addEllipsis();\n        }\n    }\n\n    static parse (str, text_wrap, max_lines, line_height, ctx) {\n        // Word wrapping\n        // Line breaks can be caused by:\n        //  - implicit line break when a maximum character threshold is exceeded per line (text_wrap)\n        //  - explicit line break in the label text (\\n)\n        let words;\n        if (typeof text_wrap === 'number') {\n            words = str.split(' '); // split words on spaces\n        }\n        else {\n            words = [str]; // no max line word wrapping (but new lines will still be in effect)\n        }\n\n        let multiline = new MultiLine(ctx, max_lines, text_wrap);\n        let line = multiline.createLine(line_height);\n\n        // First iterate on space-break groups (will be one if max line length off), then iterate on line-break groups\n        for (let i = 0; i < words.length; i++) {\n            let breaks = words[i].split('\\n'); // split on line breaks\n            let new_line = (i === 0) ? true : false;\n\n            for (let n=0; n < breaks.length; n++) {\n                if (!line){\n                    break;\n                }\n\n                // let word = breaks[n].trim();\n                let word = breaks[n];\n\n                if (!word) {\n                    continue;\n                }\n\n                let spaced_word = (new_line) ? word : ' ' + word;\n\n                // if adding current word would overflow, add a new line instead\n                // first word (i === 0) always appends\n                if (text_wrap && i > 0 && line.exceedsTextwrap(spaced_word)) {\n                    line = multiline.advance(line, line_height);\n                    if (!line){\n                        break;\n                    }\n                    line.append(word);\n                    new_line = true;\n                }\n                else {\n                    line.append(spaced_word);\n                }\n\n                // if line breaks present, add new line (unless on last line)\n                if (n < breaks.length - 1) {\n                    line = multiline.advance(line, line_height);\n                    new_line = true;\n                }\n            }\n\n            if (i === words.length - 1){\n                multiline.finish(line);\n            }\n        }\n        return multiline;\n    }\n}\n\n// A Private class used by MultiLine to contain the logic for a single line\n// including character count, width, height and text\nclass Line {\n    constructor (height = 0, text_wrap = 0){\n        this.chars = 0;\n        this.text = '';\n\n        this.height = Math.ceil(height);\n        this.text_wrap = text_wrap;\n    }\n\n    append (text){\n        this.chars += text.length;\n        this.text += text;\n    }\n\n    exceedsTextwrap (text){\n        return text.length + this.chars > this.text_wrap;\n    }\n}\n",
+    "import log from '../../utils/log';\nimport Utils from '../../utils/utils';\nimport Texture from '../../gl/texture';\nimport FontManager from './font_manager';\nimport debugSettings from '../../utils/debug_settings';\n\nconst codon_length = 2; // length of chunks when breaking up label text\n\nexport default class CanvasText {\n\n    constructor () {\n        this.canvas = document.createElement('canvas');\n        this.canvas.style.backgroundColor = 'transparent'; // render text on transparent background\n        this.context = this.canvas.getContext('2d');\n        this.vertical_text_buffer = 8; // vertical pixel padding around text\n        this.horizontal_text_buffer = 4; // text styling such as italic emphasis is not measured by the Canvas API, so padding is necessary\n    }\n\n    resize (width, height) {\n        this.canvas.width = width;\n        this.canvas.height = height;\n        this.context.clearRect(0, 0, width, height);\n    }\n\n    // Set font style params for canvas drawing\n    setFont ({ font_css, fill, stroke, stroke_width, px_size, supersample }) {\n        this.px_size = px_size;\n        let ctx = this.context;\n        let dpr = Utils.device_pixel_ratio * supersample;\n\n        if (stroke && stroke_width > 0) {\n            ctx.strokeStyle = stroke;\n            ctx.lineWidth = stroke_width * dpr;\n        }\n        ctx.fillStyle = fill;\n\n        ctx.font = font_css;\n        ctx.miterLimit = 2;\n    }\n\n    textSizes (texts) {\n        let dpr;\n        return FontManager.loadFonts().then(() => {\n            for (let style in texts) {\n                CanvasText.initTextCache(style);\n\n                let text_infos = texts[style];\n                let first = true;\n\n                for (let text in text_infos) {\n                    let text_info = text_infos[text];\n                    let text_settings = text_info.text_settings;\n\n                    if (first) {\n                        this.setFont(text_settings);\n                        dpr = Utils.device_pixel_ratio * text_settings.supersample;\n                        first = false;\n                    }\n\n                    if (text_settings.can_articulate){\n                        let segments = splitLabelText(text);\n\n                        let words = text.split(' ');\n\n                        // RTL is true if every word is RTL\n                        // BIDI is true if there is RTL and LTR\n                        let hasRTL = false;\n                        let hasLTR = false;\n                        let bidi = false;\n                        for (var i = 0; i < words.length; i++){\n                            if (isTextRTL(words[i])) {\n                                if (hasLTR){\n                                    bidi = true;\n                                    break;\n                                }\n                                hasRTL = true;\n                            }\n                            else {\n                                if (hasRTL){\n                                    bidi = true;\n                                    break;\n                                }\n                                hasLTR = true;\n                            }\n                        }\n\n                        let rtl = (hasRTL && !hasLTR) && !bidi;\n                        let shaped = isTextShaped(text);\n\n                        text_info.isRTL = rtl;\n                        text_info.no_curving = bidi || shaped;\n                        text_info.vertical_buffer = this.vertical_text_buffer;\n\n                        if (rtl) {\n                            segments.reverse();\n                        }\n\n                        text_info.segments = segments;\n                        text_info.size = [];\n\n                        if (!text_info.no_curving) {\n                            for (let i = 0; i < segments.length; i++){\n                                text_info.size.push(this.textSize(style, segments[i], text_settings).size);\n                            }\n                        }\n\n                        // add full text as well\n                        text_info.total_size = this.textSize(style, text, text_settings).size;\n                    }\n                    else {\n                        // Only send text sizes back to worker (keep computed text line info\n                        // on main thread, for future rendering)\n                        text_info.size = this.textSize(style, text, text_settings).size;\n                    }\n                }\n            }\n\n            return texts;\n        });\n    }\n\n    // Computes width and height of text based on current font style\n    // Includes word wrapping, returns size info for whole text block and individual lines\n    textSize (style, text, {transform, text_wrap, max_lines, stroke_width = 0, supersample}) {\n        // Check cache first\n        if (CanvasText.text_cache[style][text]) {\n            CanvasText.cache_stats.hits++;\n            return CanvasText.text_cache[style][text];\n        }\n        CanvasText.cache_stats.misses++;\n        CanvasText.text_cache_count++;\n\n        // Calc and store in cache\n        let dpr = Utils.device_pixel_ratio * supersample;\n        let str = this.applyTextTransform(text, transform);\n        let ctx = this.context;\n        let vertical_buffer = this.vertical_text_buffer * dpr;\n        let horizontal_buffer = dpr * (stroke_width + this.horizontal_text_buffer);\n        let leading = 2 * dpr; // make configurable and/or use Canvas TextMetrics when available\n        let line_height = this.px_size + leading; // px_size already in device pixels\n\n        // Parse string into series of lines if it exceeds the text wrapping value or contains line breaks\n        let multiline = MultiLine.parse(str, text_wrap, max_lines, line_height, ctx);\n\n        // Final dimensions of text\n        let height = multiline.height;\n        let width = multiline.width;\n        let lines = multiline.lines;\n\n        let collision_size = [\n            width / dpr,\n            height / dpr\n        ];\n\n        let texture_size = [\n            width + 2 * horizontal_buffer,\n            height + 2 * vertical_buffer\n        ];\n\n        let logical_size = [\n            texture_size[0] / dpr,\n            texture_size[1] / dpr,\n        ];\n\n        // Returns lines (w/per-line info for drawing) and text's overall bounding box + canvas size\n        CanvasText.text_cache[style][text] = {\n            lines,\n            size: { collision_size, texture_size, logical_size, line_height }\n        };\n        return CanvasText.text_cache[style][text];\n    }\n\n    // Draw multiple lines of text\n    drawTextMultiLine (lines, [x, y], size, { stroke, stroke_width = 0, transform, align, supersample }, type) {\n        let line_height = size.line_height;\n        let height = y;\n        for (let line_num=0; line_num < lines.length; line_num++) {\n            let line = lines[line_num];\n            this.drawTextLine(line, [x, height], size, { stroke, stroke_width, transform, align, supersample }, type);\n            height += line_height;\n        }\n\n        // Draw bounding boxes for debugging\n        if (debugSettings.draw_label_collision_boxes) {\n            this.context.save();\n\n            let dpr = Utils.device_pixel_ratio * supersample;\n            let horizontal_buffer = dpr * (this.horizontal_text_buffer + stroke_width);\n            let vertical_buffer = dpr * this.vertical_text_buffer;\n            let collision_size = size.collision_size;\n            let lineWidth = 2;\n\n            this.context.strokeStyle = 'blue';\n            this.context.lineWidth = lineWidth;\n            this.context.strokeRect(x + horizontal_buffer, y + vertical_buffer, dpr * collision_size[0], dpr * collision_size[1]);\n            if (type === 'curved'){\n                this.context.strokeRect(x + size.texture_size[0] + horizontal_buffer, y + vertical_buffer, dpr * collision_size[0], dpr * collision_size[1]);\n            }\n\n            this.context.restore();\n        }\n\n        if (debugSettings.draw_label_texture_boxes) {\n            this.context.save();\n\n            let texture_size = size.texture_size;\n            let lineWidth = 2;\n\n            this.context.strokeStyle = 'green';\n            this.context.lineWidth = lineWidth;\n            // stroke is applied internally, so the outer border is the edge of the texture\n            this.context.strokeRect(x + lineWidth, y + lineWidth, texture_size[0] - 2 * lineWidth, texture_size[1] - 2 * lineWidth);\n\n            if (type === 'curved'){\n                this.context.strokeRect(x + lineWidth + size.texture_size[0], y + lineWidth, texture_size[0] - 2 * lineWidth, texture_size[1] - 2 * lineWidth);\n            }\n\n            this.context.restore();\n        }\n    }\n\n    // Draw single line of text at specified location, adjusting for buffer and baseline\n    drawTextLine (line, [x, y], size, { stroke, stroke_width = 0, transform, align, supersample }, type) {\n        let dpr = Utils.device_pixel_ratio * supersample;\n        align = align || 'center';\n\n        let vertical_buffer = this.vertical_text_buffer * dpr;\n        let texture_size = size.texture_size;\n        let line_height = size.line_height;\n        let horizontal_buffer = dpr * (stroke_width + this.horizontal_text_buffer);\n\n        let str = this.applyTextTransform(line.text, transform);\n\n        // Text alignment\n        let tx;\n        if (align === 'left') {\n            tx = x + horizontal_buffer;\n        }\n        else if (align === 'center') {\n            tx = x + texture_size[0]/2 - line.width/2;\n        }\n        else if (align === 'right') {\n            tx = x + texture_size[0] - line.width - horizontal_buffer;\n        }\n\n        // In the absence of better Canvas TextMetrics (not supported by browsers yet),\n        // 0.75 buffer produces a better approximate vertical centering of text\n        let ty = y + vertical_buffer * 0.75 + line_height;\n\n        if (stroke && stroke_width > 0) {\n            let shift = (type === 'curved') ? texture_size[0] : 0;\n            this.context.strokeText(str, tx + shift, ty);\n        }\n        this.context.fillText(str, tx, ty);\n    }\n\n    rasterize (texts, texture_size, tile_key) {\n        for (let style in texts) {\n            let text_infos = texts[style];\n            let first = true;\n\n            for (let text in text_infos) {\n                let text_info = text_infos[text];\n                let text_settings = text_info.text_settings;\n\n                // set font on first occurence of new font style\n                if (first) {\n                    this.setFont(text_settings);\n                    first = false;\n                }\n\n                if (text_settings.can_articulate){\n                    let words = text_info.segments;\n\n                    text_info.texcoords = {};\n                    for (let i = 0; i < text_info.type.length; i++){\n\n                        let type = text_info.type[i];\n                        switch (type){\n                            case 'straight':\n                                let word = words.reduce((text_info.isRTL) ? reduceLeft : reduceRight);\n                                let texcoord;\n\n                                if (CanvasText.texcoord_cache[tile_key][style][word].texcoord){\n                                    texcoord = CanvasText.texcoord_cache[tile_key][style][word].texcoord;\n                                }\n                                else {\n                                    let texture_position = CanvasText.texcoord_cache[tile_key][style][word].texture_position;\n                                    let size = CanvasText.text_cache[style][word].size;\n                                    let line = CanvasText.text_cache[style][word].lines;\n\n                                    this.drawTextMultiLine(line, texture_position, size, text_settings, type);\n\n                                    texcoord = Texture.getTexcoordsForSprite(\n                                        texture_position,\n                                        size.texture_size,\n                                        texture_size\n                                    );\n\n                                    CanvasText.texcoord_cache[tile_key][style][word].texcoord = texcoord;\n                                }\n\n                                text_info.texcoords[type] = texcoord;\n                                break;\n                            case 'curved':\n                                text_info.texcoords.curved = [];\n                                text_info.texcoords_stroke = [];\n                                for (let i = 0; i < words.length; i++){\n                                    let word = words[i];\n                                    let texcoord;\n                                    let texcoord_stroke;\n\n                                    if (CanvasText.texcoord_cache[tile_key][style][word].texcoord){\n                                        texcoord = CanvasText.texcoord_cache[tile_key][style][word].texcoord;\n                                        texcoord_stroke = CanvasText.texcoord_cache[tile_key][style][word].texcoord_stroke;\n\n                                        text_info.texcoords_stroke.push(texcoord_stroke);\n                                    }\n                                    else {\n                                        let texture_position = CanvasText.texcoord_cache[tile_key][style][word].texture_position;\n                                        let size = CanvasText.text_cache[style][word].size;\n                                        let line = CanvasText.text_cache[style][word].lines;\n\n                                        this.drawTextMultiLine(line, texture_position, size, text_settings, type);\n\n                                        texcoord = Texture.getTexcoordsForSprite(\n                                            texture_position,\n                                            size.texture_size,\n                                            texture_size\n                                        );\n\n                                        let texture_position_stroke = [\n                                            texture_position[0] + size.texture_size[0],\n                                            texture_position[1]\n                                        ];\n\n                                        texcoord_stroke = Texture.getTexcoordsForSprite(\n                                            texture_position_stroke,\n                                            size.texture_size,\n                                            texture_size\n                                        );\n\n                                        CanvasText.texcoord_cache[tile_key][style][word].texcoord = texcoord;\n                                        CanvasText.texcoord_cache[tile_key][style][word].texcoord_stroke = texcoord_stroke;\n\n                                        text_info.texcoords_stroke.push(texcoord_stroke);\n                                    }\n\n                                    text_info.texcoords.curved.push(texcoord);\n                                }\n                                break;\n                        }\n                    }\n                }\n                else {\n                    let lines = CanvasText.text_cache[style][text].lines; // get previously computed lines of text\n                    for (let align in text_info.align) {\n                        this.drawTextMultiLine(lines, text_info.align[align].texture_position, text_info.size, {\n                            stroke: text_settings.stroke,\n                            stroke_width: text_settings.stroke_width,\n                            transform: text_settings.transform,\n                            supersample: text_settings.supersample,\n                            align: align\n                        });\n\n                        text_info.align[align].texcoords = Texture.getTexcoordsForSprite(\n                            text_info.align[align].texture_position,\n                            text_info.size.texture_size,\n                            texture_size\n                        );\n                    }\n                }\n            }\n        }\n        CanvasText.clearTexcoordCache(tile_key);\n    }\n\n    // Place text labels within an atlas of the given max size\n    setTextureTextPositions (texts, max_texture_size, tile_key) {\n        CanvasText.clearTexcoordCache(tile_key);\n        CanvasText.texcoord_cache[tile_key] = {};\n\n        // Keep track of column width\n        let column_width = 0;\n\n        // Layout labels, stacked in columns\n        let cx = 0, cy = 0; // current x/y position in atlas\n        let height = 0;     // overall atlas height\n        for (let style in texts) {\n            if (!CanvasText.texcoord_cache[tile_key][style]) {\n               CanvasText.texcoord_cache[tile_key][style] = {};\n            }\n\n            let text_infos = texts[style];\n\n            for (let text in text_infos) {\n                let text_info = text_infos[text];\n\n                if (text_info.text_settings.can_articulate){\n                    let texture_position;\n\n                    for (let i = 0; i < text_info.type.length; i++){\n                        let type = text_info.type[i];\n                        switch (type){\n                            case 'straight':\n                                let size = text_info.total_size.texture_size;\n                                let word = text_info.segments.reduce((text_info.isRTL) ? reduceLeft : reduceRight);\n\n                                if (size[0] > column_width) {\n                                    column_width = size[0];\n                                }\n                                if (cy + size[1] < max_texture_size) {\n                                    texture_position = [cx, cy];\n\n                                    cy += size[1];\n                                    if (cy > height) {\n                                        height = cy;\n                                    }\n                                }\n                                else { // start new column if taller than texture\n                                    cx += column_width;\n                                    column_width = 0;\n                                    cy = 0;\n                                    texture_position = [cx, cy];\n                                }\n\n                                CanvasText.texcoord_cache[tile_key][style][word] = {\n                                    texture_position: texture_position\n                                };\n                                break;\n                            case 'curved':\n                                for (let i = 0; i < text_info.size.length; i++) {\n                                    let word = text_info.segments[i];\n\n                                    if (!CanvasText.texcoord_cache[tile_key][style][word]) {\n\n                                        let size = text_info.size[i].texture_size;\n                                        let width = 2 * size[0];\n                                        if (width > column_width) {\n                                            column_width = width;\n                                        }\n                                        if (cy + size[1] < max_texture_size) {\n                                            texture_position = [cx, cy];\n\n                                            cy += size[1];\n                                            if (cy > height) {\n                                                height = cy;\n                                            }\n                                        }\n                                        else { // start new column if taller than texture\n                                            cx += column_width;\n                                            column_width = 0;\n                                            cy = 0;\n                                            texture_position = [cx, cy];\n                                        }\n\n                                        CanvasText.texcoord_cache[tile_key][style][word] = {\n                                            texture_position: texture_position\n                                        };\n                                    }\n                                }\n                                break;\n                        }\n                    }\n                }\n                else {\n                    // rendered size is same for all alignments\n                    let size = text_info.size.texture_size;\n                    if (size[0] > column_width) {\n                        column_width = size[0];\n                    }\n\n                    // but each alignment needs to be rendered separately\n                    for (let align in text_info.align) {\n                        if (cy + size[1] < max_texture_size) {\n                            text_info.align[align].texture_position = [cx, cy]; // add label to current column\n                            cy += size[1];\n                            if (cy > height) {\n                                height = cy;\n                            }\n                        }\n                        else { // start new column if taller than texture\n                            cx += column_width;\n                            column_width = 0;\n                            cy = 0;\n                            text_info.align[align].texture_position = [cx, cy];\n                        }\n                    }\n                }\n            }\n        }\n\n        return [cx + column_width, height]; // overall atlas size\n    }\n\n    // Called before rasterization\n    applyTextTransform (text, transform) {\n        if (transform === 'capitalize') {\n            return text.replace(/\\w\\S*/g, function (txt) {\n                return txt.charAt(0).toUpperCase() + txt.substr(1);\n            });\n        }\n        else if (transform === 'uppercase') {\n            return text.toUpperCase();\n        }\n        else if (transform === 'lowercase') {\n            return text.toLowerCase();\n        }\n        return text;\n    }\n\n    // Convert font CSS-style size ('12px', '14pt', '1.5em', etc.) to pixel size (adjusted for device pixel ratio)\n    // Defaults units to pixels if not specified\n    static fontPixelSize (size) {\n        if (size == null) {\n            return;\n        }\n        size = (typeof size === 'string') ? size : String(size); // need a string for regex\n\n        let [, px_size, units] = size.match(CanvasText.font_size_re) || [];\n        units = units || 'px';\n\n        if (units === \"em\") {\n            px_size *= 16;\n        } else if (units === \"pt\") {\n            px_size /= 0.75;\n        } else if (units === \"%\") {\n            px_size /= 6.25;\n        }\n\n        px_size = parseFloat(px_size);\n        px_size *= Utils.device_pixel_ratio;\n        return px_size;\n    }\n\n    static clearTexcoordCache (tile_key) {\n        delete CanvasText.texcoord_cache[tile_key];\n    }\n\n    static initTextCache (style) {\n        CanvasText.text_cache[style] = CanvasText.text_cache[style] || {};\n    }\n\n    static pruneTextCache () {\n        if (CanvasText.text_cache_count > CanvasText.text_cache_count_max) {\n            CanvasText.text_cache = {};\n            CanvasText.text_cache_count = 0;\n            log('debug', 'CanvasText: pruning text cache');\n        }\n    }\n\n}\n\n// Extract font size and units\nCanvasText.font_size_re = /((?:[0-9]*\\.)?[0-9]+)\\s*(px|pt|em|%)?/;\n\n// Cache sizes of rendered text\nCanvasText.text_cache = {}; // by text style, then text string\nCanvasText.text_cache_count = 0;     // current size of cache (measured as # of entries)\nCanvasText.text_cache_count_max = 5000; // prune cache when it exceeds this size\nCanvasText.cache_stats = { hits: 0, misses: 0 };\nCanvasText.texcoord_cache = {};\n\nfunction reduceLeft (prev, next){ return next + prev; }\nfunction reduceRight (prev, next){ return prev + next; }\n\n// Contextual Shaping Languages - Unicode ranges\nconst context_langs = {\n    Arabic: \"\\u0600-\\u06FF\",\n    Bengali: \"\\u0980-\\u09FF\",\n    Burmese: \"\\u1000-\\u109F\",\n    Devanagari: \"\\u0900-\\u097F\",\n    Khmer: \"\\u1780-\\u17FF\",\n    Gujarati: \"\\u0A80-\\u0AFF\",\n    Gurmukhi: \"\\u0A00-\\u0A7F\",\n    Kannada: \"\\u0C80-\\u0CFF\",\n    Lao: \"\\u0E80-\\u0EFF\",\n    Mongolian: \"\\u1800-\\u18AF\",\n    Oriya: \"\\u0B00-\\u0B7F\",\n    Tamil: \"\\u0B80-\\u0BFF\",\n    Telugu: \"\\u0C00-\\u0C7F\",\n    Tibetan: \"\\u0F00-\\u0FFF\"\n};\n\nlet reg_ex_shaping = '[';\nfor (let key in context_langs){\n    reg_ex_shaping += context_langs[key];\n}\nreg_ex_shaping += ']';\n\nlet shaping_test = new RegExp(reg_ex_shaping);\n\nfunction isTextShaped(s){\n    return shaping_test.test(s);\n}\n\n// Right-to-left / bi-directional text handling\n// Taken from http://stackoverflow.com/questions/12006095/javascript-how-to-check-if-character-is-rtl\nlet rtlDirCheck = new RegExp('^[\\u0000-\\u0040\\u005B-\\u0060\\u007B-\\u00BF\\u00D7\\u00F7\\u02B9-\\u02FF\\u2000-\\u2BFF\\u2010-\\u2029\\u202C\\u202F-\\u2BFF\\u0591-\\u07FF\\u200F\\u202B\\u202E\\uFB1D-\\uFDFD\\uFE70-\\uFEFC]+$');\nfunction isTextRTL(s){\n    return rtlDirCheck.test(s);\n}\n\n// Splitting strategy for chopping a label into segments\nfunction splitLabelText(text){\n    if (text.length < codon_length) {\n        return [text];\n    }\n\n    let segments = [];\n\n    while (text.length){\n        let segment = text.substring(0, codon_length);\n\n        if (segment.length <= Math.floor(0.5 * codon_length)) {\n            segments[segments.length - 1] += segment;\n        }\n        else {\n            segments.push(segment);\n        }\n\n        text = text.substring(codon_length);\n    }\n\n    return segments;\n}\n\n// Private class to arrange text labels into multiple lines based on\n// \"text wrap\" and \"max line\" values\nclass MultiLine {\n    constructor (context, max_lines = Infinity, text_wrap = Infinity) {\n        this.width = 0;\n        this.height = 0;\n        this.lines = [];\n\n        this.max_lines = max_lines;\n        this.text_wrap = text_wrap;\n        this.context = context;\n    }\n\n    createLine (line_height){\n        if (this.lines.length < this.max_lines){\n            return new Line(line_height, this.text_wrap);\n        }\n        else {\n            return false;\n        }\n    }\n\n    push (line){\n        if (this.lines.length < this.max_lines){\n            // measure line width\n            let line_width = this.context.measureText(line.text).width;\n            line.width = line_width;\n\n            if (line_width > this.width){\n                this.width = Math.ceil(line_width);\n            }\n\n            // add to lines and increment height\n            this.lines.push(line);\n            this.height += line.height;\n            return true;\n        }\n        else {\n            this.addEllipsis();\n            return false;\n        }\n    }\n\n    // pushes to the lines array and returns a new line if possible (false otherwise)\n    advance (line, line_height) {\n        let can_push = this.push(line);\n        if (can_push){\n            return this.createLine(line_height);\n        }\n        else {\n            return false;\n        }\n    }\n\n    addEllipsis (){\n        let last_line = this.lines[this.lines.length - 1];\n        let ellipsis_width = Math.ceil(this.context.measureText(MultiLine.ellipsis).width);\n\n        last_line.append(MultiLine.ellipsis);\n        last_line.width += ellipsis_width;\n\n        if (last_line.width > this.width) {\n            this.width = last_line.width;\n        }\n    }\n\n    finish (line){\n        if (line){\n            this.push(line);\n        }\n        else {\n            this.addEllipsis();\n        }\n    }\n\n    static parse (str, text_wrap, max_lines, line_height, ctx) {\n        // Word wrapping\n        // Line breaks can be caused by:\n        //  - implicit line break when a maximum character threshold is exceeded per line (text_wrap)\n        //  - explicit line break in the label text (\\n)\n        let words;\n        if (typeof text_wrap === 'number') {\n            words = str.split(' '); // split words on spaces\n        }\n        else {\n            words = [str]; // no max line word wrapping (but new lines will still be in effect)\n        }\n\n        let multiline = new MultiLine(ctx, max_lines, text_wrap);\n        let line = multiline.createLine(line_height);\n\n        // First iterate on space-break groups (will be one if max line length off), then iterate on line-break groups\n        for (let i = 0; i < words.length; i++) {\n            let breaks = words[i].split('\\n'); // split on line breaks\n            let new_line = (i === 0) ? true : false;\n\n            for (let n=0; n < breaks.length; n++) {\n                if (!line){\n                    break;\n                }\n\n                // let word = breaks[n].trim();\n                let word = breaks[n];\n\n                if (!word) {\n                    continue;\n                }\n\n                let spaced_word = (new_line) ? word : ' ' + word;\n\n                // if adding current word would overflow, add a new line instead\n                // first word (i === 0) always appends\n                if (text_wrap && i > 0 && line.exceedsTextwrap(spaced_word)) {\n                    line = multiline.advance(line, line_height);\n                    if (!line){\n                        break;\n                    }\n                    line.append(word);\n                    new_line = true;\n                }\n                else {\n                    line.append(spaced_word);\n                }\n\n                // if line breaks present, add new line (unless on last line)\n                if (n < breaks.length - 1) {\n                    line = multiline.advance(line, line_height);\n                    new_line = true;\n                }\n            }\n\n            if (i === words.length - 1){\n                multiline.finish(line);\n            }\n        }\n        return multiline;\n    }\n}\n\nMultiLine.ellipsis = '...';\n\n// A Private class used by MultiLine to contain the logic for a single line\n// including character count, width, height and text\nclass Line {\n    constructor (height = 0, text_wrap = 0){\n        this.chars = 0;\n        this.text = '';\n\n        this.height = Math.ceil(height);\n        this.text_wrap = text_wrap;\n    }\n\n    append (text){\n        this.chars += text.length;\n        this.text += text;\n    }\n\n    exceedsTextwrap (text){\n        return text.length + this.chars > this.text_wrap;\n    }\n}\n",
     "/* global FontFace */\nimport log from '../../utils/log';\nimport Utils from '../../utils/utils';\nimport FontFaceObserver from 'fontfaceobserver';\n\nconst FontManager = {\n\n    // Font detection\n    fonts_loaded: Promise.resolve(), // resolves when all requested fonts have been detected\n    last_loaded: null,               // tracks last set of fonts loaded\n\n    // Load set of custom font faces\n    // `fonts` is an object where the key is a font family name, and the value is one or more font face\n    // definitions. The value can be either a single object, or an array of such objects.\n    // If the special string value 'external' is used, it indicates the the font will be loaded via external CSS.\n    loadFonts (fonts) {\n        let same = (JSON.stringify(fonts) === this.last_loaded);\n        if (fonts && !same) {\n            let queue = [];\n            for (let family in fonts) {\n                if (Array.isArray(fonts[family])) {\n                    fonts[family].forEach(face => queue.push(this.loadFontFace(family, face)));\n                }\n                else {\n                    queue.push(this.loadFontFace(family, fonts[family]));\n                }\n            }\n\n            this.last_loaded = JSON.stringify(fonts);\n            this.fonts_loaded = Promise.all(queue.filter(x => x));\n        }\n        return this.fonts_loaded;\n    },\n\n    // Load a single font face\n    // `face` contains the font face definition, with optional parameters for `weight`, `style`, and `url`.\n    // If the `url` is defined, the font is injected into the document as a CSS font-face.\n    // If the object's value is the special string 'external', or if no `url` is defined, then the font face\n    // is assumed is assumed to been loaded via external CSS. In either case, the function returns a promise\n    // that resolves when the font face has loaded, or times out.\n    loadFontFace (family, face) {\n        if (face == null || (typeof face !== 'object' && face !== 'external')) {\n            return;\n        }\n\n        let options = { family };\n        let inject = Promise.resolve();\n\n        if (typeof face === 'object') {\n            Object.assign(options, face);\n\n            // If URL is defined, inject font into document\n            if (typeof face.url === 'string') {\n                inject = this.injectFontFace(options);\n            }\n        }\n\n        // Wait for font to load\n        let observer = new FontFaceObserver(family, options);\n        return inject.then(() => observer.load()).then(\n            () => {\n                // Promise resolves, font is available\n                log('debug', `Font face '${family}' is available`, options);\n            },\n            () => {\n                // Promise rejects, font is not available\n                log('debug', `Font face '${family}' is NOT available`, options);\n            }\n        );\n    },\n\n    // Loads a font face via either the native FontFace API, or CSS injection\n    // TODO: consider support for multiple format URLs per face, unicode ranges\n    injectFontFace ({ family, url, weight, style }) {\n        if (this.supports_native_font_loading === undefined) {\n            this.supports_native_font_loading = (window.FontFace !== undefined);\n        }\n\n        // Convert blob URLs, depending on whether the native FontFace API will be used or not.\n        //\n        // When the FontFace API *is* supported, the blob URL is read into a raw data array.\n        // NB: it's inefficient to be converting blob URLs into typed arrays here, since they originated\n        // as raw data *before* they were converted into blob URLs. However, this process should be fast since\n        // these are native browser functions and all data is local (no network request), and it keeps the\n        // logic streamlined by allowing us to continue to use a URL-based interface for all scene resources.\n        //\n        // When the FontFace API is *not* supported, the blob URL data is converted to a base64 data URL.\n        // This avoids security restricions in some browsers.\n        // Also see https://github.com/bramstein/fontloader/blob/598e9399117bdc946ff786fa2c5007a6bd7d3b9e/src/fontface.js#L145-L153\n        let preprocess = Promise.resolve(url);\n        if (url.slice(0, 5) === 'blob:') {\n            preprocess = Utils.io(url, 60000, 'arraybuffer').then(data => {\n                let bytes = new Uint8Array(data);\n                if (this.supports_native_font_loading) {\n                    return bytes; // use raw binary data\n                }\n                else {\n                    let str = '';\n                    for (let i = 0; i < bytes.length; i++) {\n                        str += String.fromCharCode(bytes[i]);\n                    }\n                    return 'data:font/opentype;base64,' + btoa(str); // base64 encode as data URL\n                }\n            });\n        }\n\n        return preprocess.then(data => {\n            if (this.supports_native_font_loading) {\n                // Use native FontFace API\n                let face;\n                if (typeof data === 'string') { // add as URL\n                    face = new FontFace(family, `url(${encodeURI(data)})`, { weight, style });\n                }\n                else if (data instanceof Uint8Array) { // add as binary data\n                    face = new FontFace(family, data, { weight, style });\n                }\n                document.fonts.add(face);\n                log('trace', 'Adding FontFace to document.fonts:', face);\n            }\n            else {\n                // Use CSS injection\n                let css = `\n                    @font-face {\n                        font-family: '${family}';\n                        font-weight: ${weight || 'normal'};\n                        font-style: ${style || 'normal'};\n                        src: url(${encodeURI(data)});\n                    }\n                `;\n\n                let style_el = document.createElement('style');\n                style_el.appendChild(document.createTextNode(\"\"));\n                document.head.appendChild(style_el);\n                style_el.sheet.insertRule(css, 0);\n                log('trace', 'Injecting CSS font face:', css);\n            }\n        });\n    }\n\n};\n\nexport default FontManager;\n",
     "// Text rendering style\n\nimport Geo from '../../geo';\nimport {Style} from '../style';\nimport {Points} from '../points/points';\nimport Collision from '../../labels/collision';\nimport LabelPoint from '../../labels/label_point';\nimport LabelLine from '../../labels/label_line';\nimport gl from '../../gl/constants'; // web workers don't have access to GL context, so import all GL constants\n\nexport let TextStyle = Object.create(Points);\n\nObject.assign(TextStyle, {\n    name: 'text',\n    super: Points,\n    built_in: true,\n\n    init(options = {}) {\n        let extra_attributes = [\n            { name: 'a_angles', size: 4, type: gl.SHORT, normalized: false },\n            { name: 'a_offsets', size: 4, type: gl.UNSIGNED_SHORT, normalized: false },\n            { name: 'a_pre_angles', size: 4, type: gl.BYTE, normalized: false }\n        ];\n\n        this.super.init.call(this, options, extra_attributes);\n\n        // Set texture/point config (override parent Point class)\n        this.defines.TANGRAM_TEXTURE_POINT = true;  // standalone text is always sampled from a texture\n        this.defines.TANGRAM_SHADER_POINT = false;  // standalone text neevr draws a shader point\n\n        // Indicate vertex shader should apply zoom-interpolated offsets and angles for curved labels\n        this.defines.TANGRAM_CURVED_LABEL = true;\n\n        // Disable dual point/text mode\n        this.defines.TANGRAM_MULTI_SAMPLER = false;\n\n        // Manually un-multiply alpha, because Canvas text rasterization is pre-multiplied\n        this.defines.TANGRAM_UNMULTIPLY_ALPHA = true;\n\n        // Fade out text when tile is zooming out, e.g. acting as proxy tiles\n        this.defines.TANGRAM_FADE_ON_ZOOM_OUT = true;\n        this.defines.TANGRAM_FADE_ON_ZOOM_OUT_RATE = 2; // fade at 2x, e.g. fully transparent at 0.5 zoom level away\n\n        // Used to fade out curved labels\n        this.defines.TANGRAM_FADE_ON_ZOOM_IN = true;\n        this.defines.TANGRAM_FADE_ON_ZOOM_IN_RATE = 2; // fade at 2x, e.g. fully transparent at 0.5 zoom level away\n\n        this.reset();\n    },\n\n    /**\n     * A \"template\" that sets constant attibutes for each vertex, which is then modified per vertex or per feature.\n     * A plain JS array matching the order of the vertex layout.\n     */\n    makeVertexTemplate(style){\n        this.super.makeVertexTemplate.call(this, style);\n\n        this.fillVertexTemplate('a_pre_angles', 0, { size: 4 });\n        this.fillVertexTemplate('a_offsets', 0, { size: 4 });\n        this.fillVertexTemplate('a_angles', 0, { size: 4 });\n\n        return this.vertex_template;\n    },\n\n    reset() {\n        this.queues = {};\n        this.resetText();\n    },\n\n    // Override to queue features instead of processing immediately\n    addFeature (feature, draw, context) {\n        let tile = context.tile;\n        if (tile.generation !== this.generation) {\n            return;\n        }\n\n        // Called here because otherwise it will be delayed until the feature queue is parsed,\n        // and we want the preprocessing done before we evaluate text style below\n        draw = this.preprocess(draw);\n        if (!draw) {\n            return;\n        }\n\n        let type = feature.geometry.type;\n        draw.can_articulate = (type === \"LineString\" || type === \"MultiLineString\");\n\n        // supersample text rendering for angled labels, to improve clarity\n        draw.supersample_text = (type === \"LineString\" || type === \"MultiLineString\");\n\n        let q = this.parseTextFeature(feature, draw, context, tile);\n        if (!q) {\n            return;\n        }\n\n        // text can be an array if a `left` or `right` orientation key is defined for the text source\n        // in which case, push both text sources to the queue\n        if (q instanceof Array){\n            q.forEach(q => {\n                q.feature = feature;\n                q.context = context;\n                q.layout.vertex = false; // vertex placement option not applicable to standalone labels\n                this.queueFeature(q, tile); // queue the feature for later processing\n            });\n        }\n        else {\n            q.feature = feature;\n            q.context = context;\n            q.layout.vertex = false; // vertex placement option not applicable to standalone labels\n            this.queueFeature(q, tile); // queue the feature for later processing\n        }\n\n        // Register with collision manager\n        Collision.addStyle(this.name, tile.key);\n    },\n\n    // Override\n    startData (tile) {\n        this.queues[tile.key] = [];\n        return Style.startData.call(this, tile);\n    },\n\n    // Override\n    endData (tile) {\n        let queue = this.queues[tile.key];\n        delete this.queues[tile.key];\n\n        return this.prepareTextLabels(tile, this.name, queue).\n            then(labels => this.collideAndRenderTextLabels(tile, this.name, labels)).\n            then(({ labels, texts, texture }) => {\n                if (texts) {\n                    this.texts[tile.key] = texts;\n\n                    // Build queued features\n                    labels.forEach(q => {\n                        let text_settings_key = q.text_settings_key;\n                        let text_info =\n                            this.texts[tile.key][text_settings_key] &&\n                            this.texts[tile.key][text_settings_key][q.text];\n\n                        // setup styling object expected by Style class\n                        let style = this.feature_style;\n                        style.label = q.label;\n\n                        if (text_info.text_settings.can_articulate){\n                            // unpack logical sizes of each segment into an array for the style\n                            style.size = {};\n                            style.texcoords = {};\n\n                            if (q.label.type === 'straight'){\n                                style.size.straight = text_info.total_size.logical_size;\n                                style.texcoords.straight = text_info.texcoords.straight;\n                            }\n                            else{\n                                style.size.curved = text_info.size.map(function(size){ return size.logical_size; });\n                                style.texcoords_stroke = text_info.texcoords_stroke;\n                                style.texcoords.curved = text_info.texcoords.curved;\n                            }\n                        }\n                        else {\n                            style.size = text_info.size.logical_size;\n                            style.texcoords = text_info.align[q.label.align].texcoords;\n                        }\n\n                        Style.addFeature.call(this, q.feature, q.draw, q.context);\n                    });\n                }\n                this.freeText(tile);\n\n                // Finish tile mesh\n                return Style.endData.call(this, tile).then(tile_data => {\n                    // Attach tile-specific label atlas to mesh as a texture uniform\n                    if (texture && tile_data) {\n                        tile_data.uniforms.u_texture = texture;\n                        tile_data.textures.push(texture); // assign texture ownership to tile\n                        return tile_data;\n                    }\n                });\n            });\n    },\n\n    // Sets up caching for draw properties\n    _preprocess (draw) {\n        return this.preprocessText(draw);\n    },\n\n    // Implements label building for TextLabels mixin\n    buildTextLabels (tile_key, feature_queue) {\n        let labels = [];\n        for (let f=0; f < feature_queue.length; f++) {\n            let fq = feature_queue[f];\n            let text_info = this.texts[tile_key][fq.text_settings_key][fq.text];\n            let feature_labels;\n\n            fq.layout.vertical_buffer = text_info.vertical_buffer;\n\n            if (text_info.text_settings.can_articulate){\n                var sizes = text_info.size.map(function(size){ return size.collision_size; });\n                fq.layout.no_curving = text_info.no_curving;\n                feature_labels = this.buildLabels(sizes, fq.feature.geometry, fq.layout, text_info.total_size.collision_size);\n            }\n            else {\n                feature_labels = this.buildLabels(text_info.size.collision_size, fq.feature.geometry, fq.layout);\n            }\n            for (let i = 0; i < feature_labels.length; i++) {\n                let fql = Object.create(fq);\n                fql.label = feature_labels[i];\n                labels.push(fql);\n            }\n        }\n        return labels;\n    },\n\n    // Builds one or more labels for a geometry\n    buildLabels (size, geometry, layout, total_size) {\n        let labels = [];\n\n        if (geometry.type === \"LineString\") {\n            Array.prototype.push.apply(labels, this.buildLineLabels(geometry.coordinates, size, layout, total_size));\n        } else if (geometry.type === \"MultiLineString\") {\n            let lines = geometry.coordinates;\n            for (let i = 0; i < lines.length; ++i) {\n                Array.prototype.push.apply(labels, this.buildLineLabels(lines[i], size, layout, total_size));\n            }\n        } else if (geometry.type === \"Point\") {\n            labels.push(new LabelPoint(geometry.coordinates, size, layout));\n        } else if (geometry.type === \"MultiPoint\") {\n            let points = geometry.coordinates;\n            for (let i = 0; i < points.length; ++i) {\n                labels.push(new LabelPoint(points[i], size, layout));\n            }\n        } else if (geometry.type === \"Polygon\") {\n            let centroid = Geo.centroid(geometry.coordinates);\n            labels.push(new LabelPoint(centroid, size, layout));\n        } else if (geometry.type === \"MultiPolygon\") {\n            let centroid = Geo.multiCentroid(geometry.coordinates);\n            labels.push(new LabelPoint(centroid, size, layout));\n        }\n\n        return labels;\n    },\n\n    // Build one or more labels for a line geometry\n    buildLineLabels (line, size, layout, total_size) {\n        let labels = [];\n        let subdiv = Math.min(layout.subdiv, line.length - 1);\n        if (subdiv > 1) {\n            // Create multiple labels for line, with each allotted a range of segments\n            // in which it will attempt to place\n            let seg_per_div = (line.length - 1) / subdiv;\n            for (let i = 0; i < subdiv; i++) {\n                let start = Math.floor(i * seg_per_div);\n                let end = Math.floor((i + 1) * seg_per_div) + 1;\n                let line_segment = line.slice(start, end);\n\n                let label = LabelLine.create(size, total_size, line_segment, layout);\n                if (label){\n                    labels.push(label);\n                }\n            }\n        }\n        else {\n            let label = LabelLine.create(size, total_size, line, layout);\n            if (label){\n                labels.push(label);\n            }\n        }\n        return labels;\n    }\n});\n\nTextStyle.texture_id = 0; // namespaces per-tile label textures\n",
-    "// Text label rendering methods, can be mixed into a rendering style\n\nimport {StyleParser} from '../style_parser';\nimport Texture from '../../gl/texture';\nimport Geo from '../../geo';\nimport log from '../../utils/log';\nimport Thread from '../../utils/thread';\nimport WorkerBroker from '../../utils/worker_broker';\nimport Collision from '../../labels/collision';\nimport TextSettings from '../text/text_settings';\nimport CanvasText from '../text/canvas_text';\n\n// namespaces label textures (ensures new texture name when a tile is built multiple times)\nlet text_texture_id = 0;\n\nexport const TextLabels = {\n\n    resetText () {\n        if (Thread.is_main) {\n            this.canvas = new CanvasText();\n        }\n        else if (Thread.is_worker) {\n            this.texts = {}; // unique texts, grouped by tile, by style\n        }\n    },\n\n    freeText (tile) {\n        delete this.texts[tile.key];\n    },\n\n    parseTextFeature (feature, draw, context, tile) {\n        // Compute label text\n        let text = this.parseTextSource(feature, draw, context);\n\n        if (text == null || text === '') {\n            return; // no text for this feature\n        }\n\n        // Compute text style and layout settings for this feature label\n        let text_settings = TextSettings.compute(feature, draw, context);\n        let text_settings_key = TextSettings.key(text_settings);\n\n        // first label in tile, or with this style?\n        this.texts[tile.key] = this.texts[tile.key] || {};\n        let sizes = this.texts[tile.key][text_settings_key] = this.texts[tile.key][text_settings_key] || {};\n\n        if (text instanceof Object){\n            let results = [];\n\n            // add both left/right text elements to repeat group to improve repeat culling\n            // avoids one component of a boundary label (e.g. Colorado) being culled too aggressively when it also\n            // appears in nearby boundary labels (e.g. Colorado/Utah & Colorado/New Mexico repeat as separate groups)\n            let repeat_group_prefix = text.left + '-' + text.right; // NB: should be all text keys, not just left/right\n\n            for (let key in text){\n                let current_text = text[key];\n                if (!current_text) {\n                    continue;\n                }\n\n                let layout = this.computeTextLayout({}, feature, draw, context, tile, current_text, text_settings, repeat_group_prefix, key);\n                if (!sizes[current_text]) {\n                    // first label with this text/style/tile combination, make a new label entry\n                    sizes[current_text] = {\n                        text_settings,\n                        ref: 0 // # of times this text/style combo appears in tile\n                    };\n                }\n\n                results.push({\n                    draw, text : current_text, text_settings_key, layout\n                });\n            }\n\n            return results;\n        }\n        else {\n            // unique text strings, grouped by text drawing style\n            let layout = this.computeTextLayout({}, feature, draw, context, tile, text, text_settings);\n            if (!sizes[text]) {\n                // first label with this text/style/tile combination, make a new label entry\n                sizes[text] = {\n                    text_settings,\n                    ref: 0 // # of times this text/style combo appears in tile\n                };\n            }\n\n            return {\n                draw, text, text_settings_key, layout\n            };\n        }\n    },\n\n    // Compute the label text, default is value of feature.properties.name\n    // - String value indicates a feature property look-up, e.g. `short_name` means use feature.properties.short_name\n    // - Function will use the return value as the label text (for custom labels)\n    // - Array (of strings and/or functions) defines a list of fallbacks, evaluated according to the above rules,\n    //   with the first non-null value used as the label text\n    //   e.g. `[name:es, name:en, name]` prefers Spanish names, followed by English, and last the default local name\n    parseTextSource (feature, draw, context) {\n        let text;\n        let source = draw.text_source || 'name';\n\n        if (source != null && typeof source === 'object') {\n            // left/right boundary labels\n            text = {};\n            for (let key in source) {\n                text[key] = this.parseTextSourceValue(source[key], feature, context);\n            }\n        }\n        else {\n            // single label\n            text = this.parseTextSourceValue(source, feature, context);\n        }\n\n        return text;\n    },\n\n    parseTextSourceValue (source, feature, context) {\n        let text;\n        if (Array.isArray(source)) {\n            for (let s=0; s < source.length; s++) {\n                if (typeof source[s] === 'string') {\n                    text = feature.properties[source[s]];\n                } else if (typeof source[s] === 'function') {\n                    text = source[s](context);\n                }\n\n                if (text) {\n                    return text; // stop if we found a text property\n                }\n            }\n        }\n        else if (typeof source === 'string') {\n            text = feature.properties[source];\n        }\n        else if (source instanceof Function) {\n            text = source(context);\n        }\n\n        return text;\n    },\n\n    prepareTextLabels (tile, collision_group, queue) {\n        if (Object.keys(this.texts[tile.key]||{}).length === 0) {\n            return Promise.resolve({});\n        }\n\n        // first call to main thread, ask for text pixel sizes\n        return WorkerBroker.postMessage(this.main_thread_target+'.calcTextSizes', this.texts[tile.key]).then(texts => {\n\n            if (tile.canceled) {\n                log('trace', `Style ${this.name}: stop tile build because tile was canceled: ${tile.key}, post-calcTextSizes()`);\n                return;\n            }\n\n            this.texts[tile.key] = texts;\n            if (!texts) {\n                return;\n            }\n\n            return this.buildTextLabels(tile.key, queue);\n        });\n    },\n\n    collideAndRenderTextLabels (tile, collision_group, labels) {\n        if (!labels) {\n            Collision.collide({}, collision_group, tile.key);\n            return Promise.resolve({});\n        }\n\n        return Collision.collide(labels, collision_group, tile.key).then(labels => {\n            if (tile.canceled) {\n                log('trace', `stop tile build because tile was canceled: ${tile.key}, post-collide()`);\n                return {};\n            }\n\n            if (labels.length === 0) {\n                return {};\n            }\n\n            let texts = this.texts[tile.key];\n            this.cullTextStyles(texts, labels);\n\n            // set alignments\n            labels.forEach(q => {\n                let text_settings_key = q.text_settings_key;\n                let text_info = texts[text_settings_key] && texts[text_settings_key][q.text];\n                if (!text_info.text_settings.can_articulate){\n                    text_info.align = text_info.align || {};\n                    text_info.align[q.label.align] = {};\n                }\n                else {\n                    // consider making it a set\n                    if (!text_info.type) {\n                        text_info.type = [];\n                    }\n\n                    if (text_info.type.indexOf(q.label.type) === -1){\n                        text_info.type.push(q.label.type);\n                    }\n                }\n            });\n\n            // second call to main thread, for rasterizing the set of texts\n            return WorkerBroker.postMessage(this.main_thread_target+'.rasterizeTexts', tile.key, texts).then(({ texts, texture }) => {\n                if (tile.canceled) {\n                    log('trace', `stop tile build because tile was canceled: ${tile.key}, post-rasterizeTexts()`);\n                    return {};\n                }\n\n                return { labels, texts, texture };\n            });\n        });\n    },\n\n    // Remove unused text/style combinations to avoid unnecessary rasterization\n    cullTextStyles(texts, labels) {\n        // Count how many times each text/style combination is used\n        for (let i=0; i < labels.length; i++) {\n            let label = labels[i];\n            texts[label.text_settings_key][label.text].ref++;\n        }\n\n        // Remove text/style combinations that have no visible labels\n        for (let style in texts) {\n            for (let text in texts[style]) {\n                // no labels for this text\n                if (texts[style][text].ref < 1) {\n                    delete texts[style][text];\n                }\n            }\n        }\n\n        for (let style in texts) {\n            // no labels for this style\n            if (Object.keys(texts[style]).length === 0) {\n                delete texts[style];\n            }\n        }\n    },\n\n    // Called on main thread from worker, to compute the size of each text string,\n    // were it to be rendered. This info is then used to perform initial label culling, *before*\n    // labels are actually rendered.\n    calcTextSizes (texts) {\n        return this.canvas.textSizes(texts);\n    },\n\n    // Called on main thread from worker, to create atlas of labels for a tile\n    rasterizeTexts (tile_key, texts) {\n        let canvas = new CanvasText();\n        canvas.clearTexcoordCache(tile_key);\n\n        let texture_size = canvas.setTextureTextPositions(texts, this.max_texture_size, tile_key);\n        log('trace', `text summary for tile ${tile_key}: fits in ${texture_size[0]}x${texture_size[1]}px`);\n\n        // fits in max texture size?\n        if (texture_size[0] < this.max_texture_size && texture_size[1] < this.max_texture_size) {\n            // update canvas size & rasterize all the text strings we need\n            canvas.resize(...texture_size);\n            canvas.rasterize(texts, texture_size, tile_key);\n        }\n        else {\n            log('error', [\n                `Label atlas for tile ${tile_key} is ${texture_size[0]}x${texture_size[1]}px, `,\n                `but max GL texture size is ${this.max_texture_size}x${this.max_texture_size}px`].join('')\n            );\n        }\n\n        // create a texture\n        let t = 'labels-' + tile_key + '-' + (text_texture_id++);\n        Texture.create(this.gl, t, {\n            element: canvas.canvas,\n            filtering: 'linear',\n            UNPACK_PREMULTIPLY_ALPHA_WEBGL: true\n        });\n        Texture.retain(t);\n\n        return { texts, texture: t }; // texture is returned by name (not instance)\n    },\n\n    preprocessText (draw) {\n        // Font settings are required\n        if (!draw || !draw.font || typeof draw.font !== 'object') {\n            return;\n        }\n\n        // Colors\n        draw.font.fill = StyleParser.createPropertyCache(draw.font.fill);\n        if (draw.font.stroke) {\n            draw.font.stroke.color = StyleParser.createPropertyCache(draw.font.stroke.color);\n        }\n\n        // Convert font and text stroke sizes\n        draw.font.px_size = StyleParser.createPropertyCache(draw.font.size || TextSettings.defaults.size, CanvasText.fontPixelSize);\n        if (draw.font.stroke && draw.font.stroke.width != null) {\n            draw.font.stroke.width = StyleParser.createPropertyCache(draw.font.stroke.width, parseFloat);\n        }\n\n        // Offset (2d array)\n        draw.offset = StyleParser.createPropertyCache(draw.offset, v => (Array.isArray(v) && v.map(parseFloat)) || 0);\n\n        // Buffer (1d value or or 2d array)\n        draw.buffer = StyleParser.createPropertyCache(draw.buffer, v => (Array.isArray(v) ? v : [v, v]).map(parseFloat) || 0);\n\n        // Repeat rules - for text labels, defaults to tile size\n        draw.repeat_distance = StyleParser.createPropertyCache(draw.repeat_distance || Geo.tile_size, parseFloat);\n\n        return draw;\n    },\n\n    // Additional text-specific layout settings\n    computeTextLayout (target, feature, draw, context, tile, text, text_settings, repeat_group_prefix, orientation) {\n        let layout = target || {};\n\n        // common settings w/points\n        layout = this.computeLayout(layout, feature, draw, context, tile);\n\n        // tile boundary handling\n        layout.cull_from_tile = (draw.cull_from_tile != null) ? draw.cull_from_tile : true;\n\n        // standalone text can move into tile if specified\n        layout.move_into_tile = (draw.move_into_tile != null) ? draw.move_into_tile : true;\n\n        // repeat rules include the text\n        if (layout.repeat_distance) {\n            if (repeat_group_prefix) {\n                layout.repeat_group += '/' + repeat_group_prefix;\n            }\n            layout.repeat_group += '/' + text;\n        }\n\n        // Max number of subdivisions to try\n        layout.subdiv = tile.overzoom2;\n\n        layout.align = draw.align;\n\n        // used to fudge width value as text may overflow bounding box if it has italic, bold, etc style\n        layout.italic = (text_settings.style !== 'normal');\n\n        // used to determine orientation of text if the text_source has a `left` or `right` key\n        if (orientation === 'right') {\n            layout.orientation = 1;\n        }\n        else if (orientation === 'left'){\n            layout.orientation = -1;\n        }\n\n        return layout;\n    }\n\n};\n",
+    "// Text label rendering methods, can be mixed into a rendering style\n\nimport {StyleParser} from '../style_parser';\nimport Texture from '../../gl/texture';\nimport Geo from '../../geo';\nimport log from '../../utils/log';\nimport Thread from '../../utils/thread';\nimport WorkerBroker from '../../utils/worker_broker';\nimport Collision from '../../labels/collision';\nimport TextSettings from '../text/text_settings';\nimport CanvasText from '../text/canvas_text';\n\n// namespaces label textures (ensures new texture name when a tile is built multiple times)\nlet text_texture_id = 0;\n\nexport const TextLabels = {\n\n    resetText () {\n        if (Thread.is_main) {\n            this.canvas = new CanvasText();\n        }\n        else if (Thread.is_worker) {\n            this.texts = {}; // unique texts, grouped by tile, by style\n        }\n    },\n\n    freeText (tile) {\n        delete this.texts[tile.key];\n    },\n\n    parseTextFeature (feature, draw, context, tile) {\n        // Compute label text\n        let text = this.parseTextSource(feature, draw, context);\n\n        if (text == null || text === '') {\n            return; // no text for this feature\n        }\n\n        // Compute text style and layout settings for this feature label\n        let text_settings = TextSettings.compute(feature, draw, context);\n        let text_settings_key = TextSettings.key(text_settings);\n\n        // first label in tile, or with this style?\n        this.texts[tile.key] = this.texts[tile.key] || {};\n        let sizes = this.texts[tile.key][text_settings_key] = this.texts[tile.key][text_settings_key] || {};\n\n        if (text instanceof Object){\n            let results = [];\n\n            // add both left/right text elements to repeat group to improve repeat culling\n            // avoids one component of a boundary label (e.g. Colorado) being culled too aggressively when it also\n            // appears in nearby boundary labels (e.g. Colorado/Utah & Colorado/New Mexico repeat as separate groups)\n            let repeat_group_prefix = text.left + '-' + text.right; // NB: should be all text keys, not just left/right\n\n            for (let key in text){\n                let current_text = text[key];\n                if (!current_text) {\n                    continue;\n                }\n\n                let layout = this.computeTextLayout({}, feature, draw, context, tile, current_text, text_settings, repeat_group_prefix, key);\n                if (!sizes[current_text]) {\n                    // first label with this text/style/tile combination, make a new label entry\n                    sizes[current_text] = {\n                        text_settings,\n                        ref: 0 // # of times this text/style combo appears in tile\n                    };\n                }\n\n                results.push({\n                    draw, text : current_text, text_settings_key, layout\n                });\n            }\n\n            return results;\n        }\n        else {\n            // unique text strings, grouped by text drawing style\n            let layout = this.computeTextLayout({}, feature, draw, context, tile, text, text_settings);\n            if (!sizes[text]) {\n                // first label with this text/style/tile combination, make a new label entry\n                sizes[text] = {\n                    text_settings,\n                    ref: 0 // # of times this text/style combo appears in tile\n                };\n            }\n\n            return {\n                draw, text, text_settings_key, layout\n            };\n        }\n    },\n\n    // Compute the label text, default is value of feature.properties.name\n    // - String value indicates a feature property look-up, e.g. `short_name` means use feature.properties.short_name\n    // - Function will use the return value as the label text (for custom labels)\n    // - Array (of strings and/or functions) defines a list of fallbacks, evaluated according to the above rules,\n    //   with the first non-null value used as the label text\n    //   e.g. `[name:es, name:en, name]` prefers Spanish names, followed by English, and last the default local name\n    parseTextSource (feature, draw, context) {\n        let text;\n        let source = draw.text_source || 'name';\n\n        if (source != null && typeof source === 'object') {\n            // left/right boundary labels\n            text = {};\n            for (let key in source) {\n                text[key] = this.parseTextSourceValue(source[key], feature, context);\n            }\n        }\n        else {\n            // single label\n            text = this.parseTextSourceValue(source, feature, context);\n        }\n\n        return text;\n    },\n\n    parseTextSourceValue (source, feature, context) {\n        let text;\n        if (Array.isArray(source)) {\n            for (let s=0; s < source.length; s++) {\n                if (typeof source[s] === 'string') {\n                    text = feature.properties[source[s]];\n                } else if (typeof source[s] === 'function') {\n                    text = source[s](context);\n                }\n\n                if (text) {\n                    return text; // stop if we found a text property\n                }\n            }\n        }\n        else if (typeof source === 'string') {\n            text = feature.properties[source];\n        }\n        else if (source instanceof Function) {\n            text = source(context);\n        }\n\n        return text;\n    },\n\n    prepareTextLabels (tile, collision_group, queue) {\n        if (Object.keys(this.texts[tile.key]||{}).length === 0) {\n            return Promise.resolve({});\n        }\n\n        // first call to main thread, ask for text pixel sizes\n        return WorkerBroker.postMessage(this.main_thread_target+'.calcTextSizes', this.texts[tile.key]).then(texts => {\n\n            if (tile.canceled) {\n                log('trace', `Style ${this.name}: stop tile build because tile was canceled: ${tile.key}, post-calcTextSizes()`);\n                return;\n            }\n\n            this.texts[tile.key] = texts;\n            if (!texts) {\n                return;\n            }\n\n            return this.buildTextLabels(tile.key, queue);\n        });\n    },\n\n    collideAndRenderTextLabels (tile, collision_group, labels) {\n        if (!labels) {\n            Collision.collide({}, collision_group, tile.key);\n            return Promise.resolve({});\n        }\n\n        return Collision.collide(labels, collision_group, tile.key).then(labels => {\n            if (tile.canceled) {\n                log('trace', `stop tile build because tile was canceled: ${tile.key}, post-collide()`);\n                return {};\n            }\n\n            if (labels.length === 0) {\n                return {};\n            }\n\n            let texts = this.texts[tile.key];\n            this.cullTextStyles(texts, labels);\n\n            // set alignments\n            labels.forEach(q => {\n                let text_settings_key = q.text_settings_key;\n                let text_info = texts[text_settings_key] && texts[text_settings_key][q.text];\n                if (!text_info.text_settings.can_articulate){\n                    text_info.align = text_info.align || {};\n                    text_info.align[q.label.align] = {};\n                }\n                else {\n                    // consider making it a set\n                    if (!text_info.type) {\n                        text_info.type = [];\n                    }\n\n                    if (text_info.type.indexOf(q.label.type) === -1){\n                        text_info.type.push(q.label.type);\n                    }\n                }\n            });\n\n            // second call to main thread, for rasterizing the set of texts\n            return WorkerBroker.postMessage(this.main_thread_target+'.rasterizeTexts', tile.key, texts).then(({ texts, texture }) => {\n                if (tile.canceled) {\n                    log('trace', `stop tile build because tile was canceled: ${tile.key}, post-rasterizeTexts()`);\n                    return {};\n                }\n\n                return { labels, texts, texture };\n            });\n        });\n    },\n\n    // Remove unused text/style combinations to avoid unnecessary rasterization\n    cullTextStyles(texts, labels) {\n        // Count how many times each text/style combination is used\n        for (let i=0; i < labels.length; i++) {\n            let label = labels[i];\n            texts[label.text_settings_key][label.text].ref++;\n        }\n\n        // Remove text/style combinations that have no visible labels\n        for (let style in texts) {\n            for (let text in texts[style]) {\n                // no labels for this text\n                if (texts[style][text].ref < 1) {\n                    delete texts[style][text];\n                }\n            }\n        }\n\n        for (let style in texts) {\n            // no labels for this style\n            if (Object.keys(texts[style]).length === 0) {\n                delete texts[style];\n            }\n        }\n    },\n\n    // Called on main thread from worker, to compute the size of each text string,\n    // were it to be rendered. This info is then used to perform initial label culling, *before*\n    // labels are actually rendered.\n    calcTextSizes (texts) {\n        return this.canvas.textSizes(texts);\n    },\n\n    // Called on main thread from worker, to create atlas of labels for a tile\n    rasterizeTexts (tile_key, texts) {\n        let canvas = new CanvasText();\n\n        let texture_size = canvas.setTextureTextPositions(texts, this.max_texture_size, tile_key);\n        log('trace', `text summary for tile ${tile_key}: fits in ${texture_size[0]}x${texture_size[1]}px`);\n\n        // fits in max texture size?\n        if (texture_size[0] < this.max_texture_size && texture_size[1] < this.max_texture_size) {\n            // update canvas size & rasterize all the text strings we need\n            canvas.resize(...texture_size);\n            canvas.rasterize(texts, texture_size, tile_key);\n        }\n        else {\n            log('error', [\n                `Label atlas for tile ${tile_key} is ${texture_size[0]}x${texture_size[1]}px, `,\n                `but max GL texture size is ${this.max_texture_size}x${this.max_texture_size}px`].join('')\n            );\n        }\n\n        // create a texture\n        let t = 'labels-' + tile_key + '-' + (text_texture_id++);\n        Texture.create(this.gl, t, {\n            element: canvas.canvas,\n            filtering: 'linear',\n            UNPACK_PREMULTIPLY_ALPHA_WEBGL: true\n        });\n        Texture.retain(t);\n\n        return { texts, texture: t }; // texture is returned by name (not instance)\n    },\n\n    preprocessText (draw) {\n        // Font settings are required\n        if (!draw || !draw.font || typeof draw.font !== 'object') {\n            return;\n        }\n\n        // Colors\n        draw.font.fill = StyleParser.createPropertyCache(draw.font.fill);\n        if (draw.font.stroke) {\n            draw.font.stroke.color = StyleParser.createPropertyCache(draw.font.stroke.color);\n        }\n\n        // Convert font and text stroke sizes\n        draw.font.px_size = StyleParser.createPropertyCache(draw.font.size || TextSettings.defaults.size, CanvasText.fontPixelSize);\n        if (draw.font.stroke && draw.font.stroke.width != null) {\n            draw.font.stroke.width = StyleParser.createPropertyCache(draw.font.stroke.width, parseFloat);\n        }\n\n        // Offset (2d array)\n        draw.offset = StyleParser.createPropertyCache(draw.offset, v => (Array.isArray(v) && v.map(parseFloat)) || 0);\n\n        // Buffer (1d value or or 2d array)\n        draw.buffer = StyleParser.createPropertyCache(draw.buffer, v => (Array.isArray(v) ? v : [v, v]).map(parseFloat) || 0);\n\n        // Repeat rules - for text labels, defaults to tile size\n        draw.repeat_distance = StyleParser.createPropertyCache(draw.repeat_distance || Geo.tile_size, parseFloat);\n\n        return draw;\n    },\n\n    // Additional text-specific layout settings\n    computeTextLayout (target, feature, draw, context, tile, text, text_settings, repeat_group_prefix, orientation) {\n        let layout = target || {};\n\n        // common settings w/points\n        layout = this.computeLayout(layout, feature, draw, context, tile);\n\n        // tile boundary handling\n        layout.cull_from_tile = (draw.cull_from_tile != null) ? draw.cull_from_tile : true;\n\n        // standalone text can move into tile if specified\n        layout.move_into_tile = (draw.move_into_tile != null) ? draw.move_into_tile : true;\n\n        // repeat rules include the text\n        if (layout.repeat_distance) {\n            if (repeat_group_prefix) {\n                layout.repeat_group += '/' + repeat_group_prefix;\n            }\n            layout.repeat_group += '/' + text;\n        }\n\n        // Max number of subdivisions to try\n        layout.subdiv = tile.overzoom2;\n\n        layout.align = draw.align;\n\n        // used to fudge width value as text may overflow bounding box if it has italic, bold, etc style\n        layout.italic = (text_settings.style !== 'normal');\n\n        // used to determine orientation of text if the text_source has a `left` or `right` key\n        if (orientation === 'right') {\n            layout.orientation = 1;\n        }\n        else if (orientation === 'left'){\n            layout.orientation = -1;\n        }\n\n        return layout;\n    }\n\n};\n",
     "import Utils from '../../utils/utils';\nimport Geo from '../../geo';\nimport {StyleParser} from '../style_parser';\n\nvar TextSettings;\n\nexport default TextSettings = {\n\n    // A key for grouping all labels of the same text style (e.g. same Canvas state, to minimize state changes)\n    key (settings) {\n        return [\n            settings.style,\n            settings.weight,\n            settings.family,\n            settings.px_size,\n            settings.fill,\n            settings.stroke,\n            settings.stroke_width,\n            settings.transform,\n            settings.text_wrap,\n            settings.max_lines,\n            settings.supersample,\n            Utils.device_pixel_ratio\n        ].join('/');\n    },\n\n    defaults: {\n        style: 'normal',\n        weight: null,\n        size: '12px',\n        px_size: 12,\n        family: 'Helvetica',\n        fill: 'white',\n        text_wrap: 15,\n        max_lines: 5,\n        align: 'center',\n        stroke: null,\n        stroke_width: 0\n    },\n\n    compute (feature, draw, context) {\n        let style = {};\n\n        draw.font = draw.font || this.defaults;\n\n        // LineString labels can articulate while point labels cannot. Needed for future texture coordinate calculations.\n        style.can_articulate = draw.can_articulate;\n\n        // Use fill if specified, or default\n        style.fill = (draw.font.fill && Utils.toCSSColor(StyleParser.evalCachedColorProperty(draw.font.fill, context))) || this.defaults.fill;\n\n        // Font properties are modeled after CSS names:\n        // - family: Helvetica, Futura, etc.\n        // - size: in pt, px, or em\n        // - style: normal, italic, oblique\n        // - weight: normal, bold, etc.\n        // - transform: capitalize, uppercase, lowercase\n        style.style = draw.font.style || this.defaults.style;\n        style.weight = draw.font.weight || this.defaults.weight;\n        if (draw.font.family) {\n            style.family = draw.font.family;\n            if (style.family !== this.defaults.family) {\n                style.family += ', ' + this.defaults.family;\n            }\n        }\n        else {\n            style.family = this.defaults.family;\n        }\n\n        style.transform = draw.font.transform;\n\n        // original size (not currently used, but useful for debugging)\n        style.size = draw.font.size || this.defaults.size;\n\n        // calculated pixel size\n        style.supersample = draw.supersample_text ? 1.5 : 1; // optionally render text at 150% to improve clarity\n        style.px_size = StyleParser.evalCachedProperty(draw.font.px_size, context) * style.supersample;\n\n        // Use stroke if specified\n        if (draw.font.stroke && draw.font.stroke.color) {\n            style.stroke = Utils.toCSSColor(StyleParser.evalCachedColorProperty(draw.font.stroke.color, context) || this.defaults.stroke);\n            style.stroke_width = StyleParser.evalCachedProperty(draw.font.stroke.width, context) || this.defaults.stroke_width;\n        }\n\n        style.font_css = this.fontCSS(style);\n\n        // Word wrap and text alignment\n        // Not a font properties, but affect atlas of unique text textures\n        let text_wrap = draw.text_wrap; // use explicitly set value\n\n        if (text_wrap == null && Geo.geometryType(feature.geometry.type) !== 'line') {\n            // point labels (for point and polygon features) have word wrap on w/default max length,\n            // line labels default off\n            text_wrap = true;\n        }\n\n        // setting to 'true' causes default wrap value to be used\n        if (text_wrap === true) {\n            text_wrap = this.defaults.text_wrap;\n        }\n        style.text_wrap = text_wrap;\n\n        // max_lines setting to truncate very long labels with an ellipsis\n        style.max_lines = draw.max_lines || this.defaults.max_lines;\n\n        return style;\n    },\n\n    // Build CSS-style font string (to set Canvas draw state)\n    fontCSS ({ style, weight, px_size, family }) {\n        return [style, weight, px_size + 'px', family]\n            .filter(x => x) // remove null props\n            .join(' ');\n    }\n\n};\n",
     "import log from './utils/log';\nimport Utils from './utils/utils';\nimport mergeObjects from './utils/merge';\nimport Geo from './geo';\nimport {StyleParser} from './styles/style_parser';\nimport Collision from './labels/collision';\nimport WorkerBroker from './utils/worker_broker';\nimport Texture from './gl/texture';\n\nimport {mat4, vec3} from './utils/gl-matrix';\n\nexport default class Tile {\n\n    /**\n        Tile\n        @constructor\n        Required properties:\n        coords: object with {x, y, z} properties identifying tile coordinate location\n        worker: web worker to handle tile construction\n    */\n    constructor({ coords, style_zoom, source, worker, view }) {\n        this.worker = worker;\n        this.view = view;\n        this.source = source;\n        this.generation = null;\n\n        this.visible = false;\n        this.proxy_for = null;\n        this.proxy_depth = 0;\n        this.proxied_as = null;\n        this.fade_in = true;\n        this.loading = false;\n        this.loaded = false;\n        this.built = false;\n        this.error = null;\n        this.debug = {};\n\n        this.coords = Tile.coordinateWithMaxZoom(coords, this.source.max_zoom);\n        this.style_zoom = style_zoom; // zoom level to be used for styling\n        this.overzoom = Math.max(this.style_zoom - this.coords.z, 0); // number of levels of overzooming\n        this.overzoom2 = Math.pow(2, this.overzoom);\n        this.key = Tile.key(this.coords, this.source, this.style_zoom);\n        this.min = Geo.metersForTile(this.coords);\n        this.max = Geo.metersForTile({x: this.coords.x + 1, y: this.coords.y + 1, z: this.coords.z }),\n        this.span = { x: (this.max.x - this.min.x), y: (this.max.y - this.min.y) };\n        this.bounds = { sw: { x: this.min.x, y: this.max.y }, ne: { x: this.max.x, y: this.min.y } };\n        this.center_dist = 0;\n\n        this.meters_per_pixel = Geo.metersPerPixel(this.style_zoom);\n        this.meters_per_pixel_sq = this.meters_per_pixel * this.meters_per_pixel;\n        this.units_per_pixel = Geo.units_per_pixel / this.overzoom2; // adjusted for overzoom\n        this.units_per_meter_overzoom = Geo.unitsPerMeter(this.coords.z) * this.overzoom2; // adjusted for overzoom\n\n        this.meshes = {}; // renderable VBO meshes keyed by style\n        this.textures = []; // textures that the tile owns (labels, etc.)\n        this.previous_textures = []; // textures retained by the tile in the previous build generation\n        this.new_mesh_styles = []; // meshes that have been built so far in current build generation\n    }\n\n    static create(spec) {\n        return new Tile(spec);\n    }\n\n    static coord(c) {\n        return {x: c.x, y: c.y, z: c.z, key: Tile.coordKey(c)};\n    }\n\n    static coordKey({x, y, z}) {\n        return x + '/' + y + '/' + z;\n    }\n\n    static key (coords, source, style_zoom) {\n        coords = Tile.coordinateWithMaxZoom(coords, source.max_zoom);\n        if (coords.y < 0 || coords.y >= (1 << coords.z) || coords.z < 0) {\n            return; // cull tiles out of range (x will wrap)\n        }\n        return [source.name, style_zoom, coords.x, coords.y, coords.z].join('/');\n    }\n\n    static coordinateAtZoom({x, y, z, key}, zoom) {\n        if (z !== zoom) {\n            let zscale = Math.pow(2, z - zoom);\n            x = Math.floor(x / zscale);\n            y = Math.floor(y / zscale);\n            z = zoom;\n        }\n        return Tile.coord({x, y, z});\n    }\n\n    static coordinateWithMaxZoom({x, y, z}, max_zoom) {\n        if (max_zoom !== undefined && z > max_zoom) {\n            return Tile.coordinateAtZoom({x, y, z}, max_zoom);\n        }\n        return Tile.coord({x, y, z});\n    }\n\n    static childrenForCoordinate({x, y, z, key}) {\n        if (!Tile.coord_children[key]) {\n            z++;\n            x *= 2;\n            y *= 2;\n            Tile.coord_children[key] = [\n                Tile.coord({x, y,      z}), Tile.coord({x: x+1, y,      z}),\n                Tile.coord({x, y: y+1, z}), Tile.coord({x: x+1, y: y+1, z})\n            ];\n        }\n        return Tile.coord_children[key];\n    }\n\n    static isDescendant(parent, descendant) {\n        if (descendant.z > parent.z) {\n            let {x, y} = Tile.coordinateAtZoom(descendant, parent.z);\n            return (parent.x === x && parent.y === y);\n        }\n        return false;\n    }\n\n    // Sort a set of tile instances (which already have a distance from center tile computed)\n    static sort(tiles) {\n        return tiles.sort((a, b) => {\n            let ad = a.center_dist;\n            let bd = b.center_dist;\n            return (bd > ad ? -1 : (bd === ad ? 0 : 1));\n        });\n    }\n\n    // Free resources owned by tile\n    freeResources () {\n        for (let m in this.meshes) {\n            this.meshes[m].destroy();\n        }\n        this.meshes = {};\n\n        this.textures.forEach(t => Texture.release(t));\n        this.textures = [];\n\n        this.previous_textures.forEach(t => Texture.release(t));\n        this.previous_textures = [];\n    }\n\n    destroy() {\n        this.workerMessage('self.removeTile', this.key);\n        this.freeResources();\n        this.worker = null;\n    }\n\n    buildAsMessage() {\n        return {\n            key: this.key,\n            source: this.source.name,\n            coords: this.coords,\n            min: this.min,\n            max: this.max,\n            units_per_pixel: this.units_per_pixel,\n            meters_per_pixel: this.meters_per_pixel,\n            meters_per_pixel_sq: this.meters_per_pixel_sq,\n            units_per_meter_overzoom: this.units_per_meter_overzoom,\n            style_zoom: this.style_zoom,\n            overzoom: this.overzoom,\n            overzoom2: this.overzoom2,\n            generation: this.generation,\n            debug: this.debug\n        };\n    }\n\n    workerMessage (...message) {\n        return WorkerBroker.postMessage(this.worker, ...message);\n    }\n\n    build(generation, { fade_in = true } = {}) {\n        this.generation = generation;\n        this.fade_in = fade_in;\n        if (!this.loaded) {\n            this.loading = true;\n            this.built = false;\n        }\n        return this.workerMessage('self.buildTile', { tile: this.buildAsMessage() }).catch(e => { throw e; });\n    }\n\n    /**\n        Called on worker to cancel loading\n        Static method because the worker only has object representations of tile data, there is no\n        tile instance created yet.\n    */\n    static cancel(tile) {\n        if (tile) {\n            tile.canceled = true;\n            if (tile.source_data && tile.source_data.request_id) {\n                Utils.cancelRequest(tile.source_data.request_id); // cancel pending tile network request\n                tile.source_data.request_id = null;\n            }\n            Tile.abortBuild(tile);\n        }\n    }\n\n    // Process geometry for tile - called by web worker\n    // Returns a set of tile keys that should be sent to the main thread (so that we can minimize data exchange between worker and main thread)\n    static buildGeometry (tile, { scene_id, layers, styles, global }) {\n        let data = tile.source_data;\n\n        tile.debug.rendering = +new Date();\n        tile.debug.feature_count = 0;\n\n        Collision.startTile(tile.key);\n\n        // Process each top-level layer\n        for (let layer_name in layers) {\n            let layer = layers[layer_name];\n            // Skip layers with no data source defined\n            if (!layer || !layer.config_data) {\n                log('warn', `Layer ${layer_name} was defined without a geometry data source and will not be rendered.`);\n                continue;\n            }\n\n            // Source names don't match\n            if (layer.config_data.source !== tile.source) {\n                continue;\n            }\n\n            // Get data for one or more layers from source\n            let source_layers = Tile.getDataForSource(data, layer.config_data, layer_name);\n\n            // Render features in layer\n            for (let s=0; s < source_layers.length; s++) {\n                let source_layer = source_layers[s];\n                let geom = source_layer.geom;\n                if (!geom) {\n                    continue;\n                }\n\n                for (let f = 0; f < geom.features.length; f++) {\n                    let feature = geom.features[f];\n                    if (feature.geometry == null) {\n                        continue; // skip features w/o geometry (valid GeoJSON)\n                    }\n\n                    let context = StyleParser.getFeatureParseContext(feature, tile, global);\n                    context.winding = tile.default_winding;\n                    context.source = tile.source;        // add data source name\n                    context.layer = source_layer.layer;  // add data source layer name\n\n                    // Get draw groups for this feature\n                    let draw_groups = layer.buildDrawGroups(context, true);\n                    if (!draw_groups) {\n                        continue;\n                    }\n\n                    // Render draw groups\n                    for (let group_name in draw_groups) {\n                        let group = draw_groups[group_name];\n                        if (!group.visible) {\n                            continue;\n                        }\n\n                        // Add to style\n                        let style_name = group.style || group_name;\n                        let style = styles[style_name];\n\n                        if (!style) {\n                            log('warn', `Style '${style_name}' not found, skipping layer '${layer_name}':`, group, feature);\n                            continue;\n                        }\n\n                        context.layers = group.layers;  // add matching draw layers\n\n                        style.addFeature(feature, group, context);\n                    }\n\n                    tile.debug.feature_count++;\n                }\n            }\n        }\n        tile.debug.rendering = +new Date() - tile.debug.rendering;\n\n        // Send styles back to main thread as they finish building, in two groups: collision vs. non-collision\n        let tile_styles = this.stylesForTile(tile.key, styles).map(s => styles[s]);\n        Tile.sendStyleGroups(tile, tile_styles, { scene_id }, style => style.collision ? 'collision' : 'non-collision');\n        // Tile.sendStyleGroups(tile, tile_styles, { scene_id }, style => style.name); // call for each style\n        // Tile.sendStyleGroups(tile, tile_styles, { scene_id }, style => 'styles'); // all styles in single call (previous behavior)\n    }\n\n    static stylesForTile (tile_key, styles) {\n        let tile_styles = [];\n        for (let s in styles) {\n            if (styles[s].hasDataForTile(tile_key)) {\n                tile_styles.push(s);\n            }\n        }\n        return tile_styles;\n    }\n\n    // Send groups of styles back to main thread, asynchronously (as they finish building),\n    // grouped by the provided function\n    static sendStyleGroups(tile, styles, { scene_id }, group_by) {\n        // Group styles\n        let groups = {};\n        styles.forEach(s => {\n            let group_name = group_by(s);\n            groups[group_name] = groups[group_name] || [];\n            groups[group_name].push(s);\n        });\n\n        if (Object.keys(groups).length > 0) {\n            let progress = { start: true };\n            tile.mesh_data = {};\n\n            for (let group_name in groups) {\n                let group = groups[group_name];\n\n                Promise.all(group.map(style => {\n                    return style.endData(tile).then(style_data => {\n                        if (style_data) {\n                            tile.mesh_data[style.name] = {\n                                vertex_data: style_data.vertex_data,\n                                vertex_elements: style_data.vertex_elements,\n                                uniforms: style_data.uniforms,\n                                textures: style_data.textures\n                            };\n                        }\n                    });\n                }))\n                .then(() => {\n                    log('trace', `Finished style group '${group_name}' for tile ${tile.key}`);\n\n                    // Clear group and check if all groups finished\n                    groups[group_name] = [];\n                    if (Object.keys(groups).every(g => groups[g].length === 0)) {\n                        progress.done = true;\n                    }\n\n                    // Send meshes to main thread\n                    WorkerBroker.postMessage(\n                        `TileManager_${scene_id}.buildTileStylesCompleted`,\n                        WorkerBroker.withTransferables({ tile: Tile.slice(tile, ['mesh_data']), progress })\n                    );\n                    progress.start = null;\n                    tile.mesh_data = {}; // reset so each group sends separate set of style meshes\n\n                    if (progress.done) {\n                        Collision.resetTile(tile.key); // clear collision if we're done with the tile\n                    }\n                });\n            }\n        }\n        else {\n            // Nothing to build, return empty tile to main thread\n            WorkerBroker.postMessage(\n                `TileManager_${scene_id}.buildTileStylesCompleted`,\n                WorkerBroker.withTransferables({ tile: Tile.slice(tile), progress: { start: true, done: true } })\n            );\n            Collision.resetTile(tile.key); // clear collision if we're done with the tile\n        }\n    }\n\n    /**\n        Retrieves geometry from a tile according to a data source definition\n        Returns an array of objects with:\n            layer: source layer name\n            geom: GeoJSON FeatureCollection\n    */\n    static getDataForSource (source_data, source_config, default_layer = null) {\n        var layers = [];\n\n        if (source_config != null && source_data != null && source_data.layers != null) {\n            // If no layer specified, and a default source layer exists\n            if (!source_config.layer && source_data.layers._default) {\n                layers.push({\n                    geom: source_data.layers._default\n                });\n            }\n            // If no layer specified, and a default requested layer exists\n            else if (!source_config.layer && default_layer) {\n                layers.push({\n                    layer: default_layer,\n                    geom: source_data.layers[default_layer]\n                });\n            }\n            // If a layer is specified by name, use it\n            else if (typeof source_config.layer === 'string') {\n                layers.push({\n                    layer: source_config.layer,\n                    geom: source_data.layers[source_config.layer]\n                });\n            }\n            // If multiple layers are specified by name, combine them\n            else if (Array.isArray(source_config.layer)) {\n                source_config.layer.forEach(layer => {\n                    if (source_data.layers[layer] && source_data.layers[layer].features) {\n                        layers.push({\n                            layer,\n                            geom: source_data.layers[layer]\n                        });\n                    }\n                });\n            }\n        }\n\n        return layers;\n    }\n\n    /**\n       Called on main thread when a web worker completes processing\n       for a single tile.\n    */\n    buildMeshes(styles, progress) {\n        if (this.error) {\n            return;\n        }\n\n        // Debug\n        if (progress.start) {\n            this.debug.geometry_count = 0;\n            this.debug.buffer_size = 0;\n        }\n\n        // Create VBOs\n        let meshes = {}, textures = []; // new data to be added to tile\n        let mesh_data = this.mesh_data;\n        if (mesh_data) {\n            for (var s in mesh_data) {\n                if (mesh_data[s].vertex_data) {\n                    if (!styles[s]) {\n                        log('warn', `Could not create mesh because style '${s}' not found, for tile ${this.key}, aborting tile`);\n                        break;\n                    }\n                    meshes[s] = styles[s].makeMesh(mesh_data[s].vertex_data, mesh_data[s].vertex_elements, mesh_data[s]);\n                    this.debug.buffer_size += meshes[s].buffer_size;\n                    this.debug.geometry_count += meshes[s].geometry_count;\n                }\n\n                // Assign texture ownership to tiles\n                // Note that it's valid for a single texture to be referenced from multiple styles\n                // (e.g. same raster texture attached to multiple sources). This means the same\n                // texture may be added to the tile's texture list more than once, which ensures\n                // that it is properly released (to match its retain count).\n                if (mesh_data[s].textures) {\n                    textures.push(...mesh_data[s].textures);\n                }\n            }\n        }\n        delete this.mesh_data;\n\n        // Initialize tracking for this tile generation\n        if (progress.start) {\n            this.new_mesh_styles = []; // keep track of which meshes were built as part of current generation\n            this.previous_textures = [...this.textures]; // copy old list of textures\n            this.textures = [];\n        }\n\n        // New meshes\n        for (let m in meshes) {\n            if (this.meshes[m]) {\n                this.meshes[m].destroy(); // free old mesh\n            }\n            this.meshes[m] = meshes[m]; // set new mesh\n            this.new_mesh_styles.push(m);\n        }\n\n        // New textures\n        this.textures.push(...textures);\n\n        if (progress.done) {\n            // Release un-replaced meshes (existing in previous generation, but weren't built for this one)\n            for (let m in this.meshes) {\n                if (this.new_mesh_styles.indexOf(m) === -1) {\n                    this.meshes[m].destroy();\n                }\n            }\n            this.new_mesh_styles = [];\n\n            // Release old textures\n            this.previous_textures.forEach(t => Texture.release(t));\n            this.previous_textures = [];\n\n            this.debug.geometry_ratio = (this.debug.geometry_count / this.debug.feature_count).toFixed(1);\n            this.printDebug();\n        }\n    }\n\n    /**\n        Called on main thread when web worker completes processing, but tile has since been discarded\n        Frees resources that would have been transferred to the tile object.\n        Static method because the tile object no longer exists (the tile data returned by the worker is passed instead).\n    */\n    static abortBuild (tile) {\n        // Releases meshes\n        if (tile.mesh_data) {\n            for (let s in tile.mesh_data) {\n                let textures = tile.mesh_data[s].textures;\n                if (textures) {\n                    textures.forEach(t => {\n                        let texture = Texture.textures[t];\n                        if (texture) {\n                            log('trace', `releasing texture ${t} for tile ${tile.key}`);\n                            texture.release();\n                        }\n                    });\n                }\n            }\n        }\n    }\n\n    // Update relative to view\n    update () {\n        let coords = this.coords;\n        if (coords.z !== this.view.center.tile.z) {\n            coords = Tile.coordinateAtZoom(coords, this.view.center.tile.z);\n        }\n        this.center_dist = Math.abs(this.view.center.tile.x - coords.x) + Math.abs(this.view.center.tile.y - coords.y);\n    }\n\n    // Set as a proxy tile for another tile\n    setProxyFor (tile) {\n        if (tile) {\n            this.visible = true;\n            this.proxy_for = this.proxy_for || [];\n            this.proxy_for.push(tile);\n            this.proxy_depth = 1; // draw proxies a half-layer back (order is scaled 2x to avoid integer truncation)\n            tile.proxied_as = (tile.style_zoom > this.style_zoom ? 'child' : 'parent');\n            this.update();\n        }\n        else {\n            this.proxy_for = null;\n            this.proxy_depth = 0;\n        }\n    }\n\n    // Proxy tiles only need to render a specific style if any of the tiles they are proxying *for*\n    // haven't finished loading that style yet. If all proxied tiles *have* data for that style, then it's\n    // safe to hide the proxy tile's version.\n    shouldProxyForStyle (style) {\n        return !this.proxy_for || this.proxy_for.some(t => t.meshes[style] == null);\n    }\n\n    // Update model matrix and tile uniforms\n    setupProgram ({ model, model32 }, program) {\n        // Tile origin\n        program.uniform('4fv', 'u_tile_origin', [this.min.x, this.min.y, this.style_zoom, this.coords.z]);\n        program.uniform('1f', 'u_tile_proxy_depth', this.proxy_depth);\n\n        // Model - transform tile space into world space (meters, absolute mercator position)\n        mat4.identity(model);\n        mat4.translate(model, model, vec3.fromValues(this.min.x, this.min.y, 0));\n        mat4.scale(model, model, vec3.fromValues(this.span.x / Geo.tile_scale, -1 * this.span.y / Geo.tile_scale, 1)); // scale tile local coords to meters\n        mat4.copy(model32, model);\n        program.uniform('Matrix4fv', 'u_model', model32);\n\n        // Fade in labels according to proxy status, avoiding \"flickering\" where\n        // labels quickly go from invisible back to visible\n        program.uniform('1i', 'u_tile_fade_in', this.fade_in && this.proxied_as !== 'child');\n    }\n\n    // Slice a subset of keys out of a tile\n    // Includes a minimum set of pre-defined keys for load state, debug. etc.\n    // We use this to send a subset of the tile back to the main thread, to minimize unnecessary data transfer\n    // (e.g. very large items like feature geometry are not needed on the main thread)\n    static slice (tile, keys) {\n        let keep = [\n            'key',\n            'loading',\n            'loaded',\n            'generation',\n            'error',\n            'debug'\n        ];\n        if (Array.isArray(keys)) {\n            keep.push(...keys);\n        }\n\n        // Build the tile subset\n        var tile_subset = {};\n        for (let k=0; k < keep.length; k++) {\n            const key = keep[k];\n            tile_subset[key] = tile[key];\n        }\n\n        return tile_subset;\n    }\n\n    merge (other) {\n        this.loading = other.loading;\n        this.loaded = other.loaded;\n        this.generation = other.loaded;\n        this.error = other.error;\n        this.mesh_data = other.mesh_data;\n        this.debug = mergeObjects(this.debug, other.debug);\n        return this;\n    }\n\n    printDebug () {\n        log('debug', `Tile: debug for ${this.key}: [  ${JSON.stringify(this.debug)} ]`);\n    }\n\n}\n\nTile.coord_children = {}; // only allocate children coordinates once per coordinate\n",
     "import Tile from './tile';\nimport TilePyramid from './tile_pyramid';\nimport log from './utils/log';\nimport WorkerBroker from './utils/worker_broker';\n\nexport default class TileManager {\n\n    constructor({ scene, view }) {\n        this.scene = scene;\n        this.view = view;\n        this.tiles = {};\n        this.pyramid = new TilePyramid();\n        this.visible_coords = {};\n        this.queued_coords = [];\n        this.building_tiles = null;\n        this.renderable_tiles = [];\n        this.active_styles = [];\n\n        // Provide a hook for this object to be called from worker threads\n        this.main_thread_target = ['TileManager', this.scene.id].join('_');\n        WorkerBroker.addTarget(this.main_thread_target, this);\n    }\n\n    destroy() {\n        this.forEachTile(tile => tile.destroy());\n        this.tiles = {};\n        this.pyramid = null;\n        this.visible_coords = {};\n        this.queued_coords = [];\n        this.scene = null;\n        this.view = null;\n    }\n\n    keepTile(tile) {\n        this.tiles[tile.key] = tile;\n        this.pyramid.addTile(tile);\n    }\n\n    hasTile(key) {\n        return this.tiles[key] !== undefined;\n    }\n\n    forgetTile(key) {\n        if (this.hasTile(key)) {\n            let tile = this.tiles[key];\n            this.pyramid.removeTile(tile);\n        }\n\n        delete this.tiles[key];\n        this.tileBuildStop(key);\n    }\n\n    // Remove a single tile\n    removeTile(key) {\n        log('trace', `tile unload for ${key}`);\n\n        var tile = this.tiles[key];\n\n        if (tile != null) {\n            tile.destroy();\n        }\n\n        this.forgetTile(tile.key);\n        this.scene.requestRedraw();\n    }\n\n    // Run a function on each tile\n    forEachTile(func) {\n        for (let t in this.tiles) {\n            func(this.tiles[t]);\n        }\n    }\n\n    // Remove tiles that pass a filter condition\n    removeTiles(filter) {\n        let remove_tiles = [];\n        for (let t in this.tiles) {\n            let tile = this.tiles[t];\n            if (filter(tile)) {\n                remove_tiles.push(t);\n            }\n        }\n        for (let r=0; r < remove_tiles.length; r++) {\n            let key = remove_tiles[r];\n            this.removeTile(key);\n        }\n    }\n\n    updateTilesForView() {\n        // Find visible tiles and load new ones\n        this.visible_coords = {};\n        let tile_coords = this.view.findVisibleTileCoordinates();\n        for (let c=0; c < tile_coords.length; c++) {\n            const coords = tile_coords[c];\n            this.queueCoordinate(coords);\n            this.visible_coords[coords.key] = coords;\n        }\n\n        this.updateTileStates();\n    }\n\n    updateTileStates () {\n        this.forEachTile(tile => {\n            this.updateVisibility(tile);\n            tile.update();\n        });\n\n        this.loadQueuedCoordinates();\n        this.updateProxyTiles();\n        this.view.pruneTilesForView();\n        this.updateRenderableTiles();\n        this.updateActiveStyles();\n    }\n\n    updateProxyTiles () {\n        if (this.view.zoom_direction === 0) {\n            return;\n        }\n\n        // Clear previous proxies\n        this.forEachTile(tile => tile.setProxyFor(null));\n\n        let proxy = false;\n        this.forEachTile(tile => {\n            if (this.view.zoom_direction === 1) {\n                if (tile.visible && !tile.built && tile.coords.z > 0) {\n                    const parent = this.pyramid.getAncestor(tile);\n                    if (parent) {\n                        parent.setProxyFor(tile);\n                        proxy = true;\n                    }\n                }\n            }\n            else if (this.view.zoom_direction === -1) {\n                if (tile.visible && !tile.built) {\n                    const descendants = this.pyramid.getDescendants(tile);\n                    for (let i=0; i < descendants.length; i++) {\n                        descendants[i].setProxyFor(tile);\n                        proxy = true;\n                    }\n                }\n            }\n        });\n\n        if (!proxy) {\n            this.view.zoom_direction = 0;\n        }\n    }\n\n    updateVisibility(tile) {\n        tile.visible = false;\n        if (tile.style_zoom === this.view.tile_zoom) {\n            if (this.visible_coords[tile.coords.key]) {\n                tile.visible = true;\n            }\n            else {\n                // brute force\n                for (let key in this.visible_coords) {\n                    if (Tile.isDescendant(tile.coords, this.visible_coords[key])) {\n                        tile.visible = true;\n                        break;\n                    }\n                }\n            }\n        }\n    }\n\n    // Remove tiles that aren't visible, and flag remaining visible ones to be updated (for loading, proxy, etc.)\n    pruneToVisibleTiles () {\n        this.removeTiles(tile => !tile.visible);\n    }\n\n    getRenderableTiles () {\n        return this.renderable_tiles;\n    }\n\n    updateRenderableTiles() {\n        this.renderable_tiles = [];\n        for (let t in this.tiles) {\n            let tile = this.tiles[t];\n            if (tile.visible && tile.loaded) {\n                this.renderable_tiles.push(tile);\n            }\n        }\n        return this.renderable_tiles;\n    }\n\n    getActiveStyles () {\n        return this.active_styles;\n    }\n\n    updateActiveStyles () {\n        let tiles = this.renderable_tiles;\n        let active = {};\n        for (let t=0; t < tiles.length; t++) {\n            let tile = tiles[t];\n            Object.keys(tile.meshes).forEach(s => active[s] = true);\n        }\n        this.active_styles = Object.keys(active);\n        return this.active_styles;\n    }\n\n    isLoadingVisibleTiles() {\n        return Object.keys(this.tiles).some(k => this.tiles[k].visible && !this.tiles[k].built);\n    }\n\n    // Queue a tile for load\n    queueCoordinate(coords) {\n        this.queued_coords[this.queued_coords.length] = coords;\n    }\n\n    // Load all queued tiles\n    loadQueuedCoordinates() {\n        if (this.queued_coords.length === 0) {\n            return;\n        }\n\n        // Sort queued tiles from center tile\n        this.queued_coords.sort((a, b) => {\n            let ad = Math.abs(this.view.center.tile.x - a.x) + Math.abs(this.view.center.tile.y - a.y);\n            let bd = Math.abs(this.view.center.tile.x - b.x) + Math.abs(this.view.center.tile.y - b.y);\n            return (bd > ad ? -1 : (bd === ad ? 0 : 1));\n        });\n        this.queued_coords.forEach(coords => this.loadCoordinate(coords));\n        this.queued_coords = [];\n    }\n\n    // Load all tiles to cover a given logical tile coordinate\n    loadCoordinate(coords) {\n        // Skip if not at current scene zoom\n        if (coords.z !== this.view.center.tile.z) {\n            return;\n        }\n\n        // Determine necessary tiles for each source\n        for (let s in this.scene.sources) {\n            let source = this.scene.sources[s];\n            // Check if data source should build this tile\n            if (!source.builds_geometry_tiles || !source.includesTile(coords, this.view.tile_zoom)) {\n                continue;\n            }\n\n            let key = Tile.key(coords, source, this.view.tile_zoom);\n            if (key && !this.hasTile(key)) {\n                let tile = Tile.create({\n                    source,\n                    coords,\n                    worker: this.scene.getWorkerForDataSource(source),\n                    style_zoom: this.view.styleZoom(coords.z),\n                    view: this.view\n                });\n\n                this.keepTile(tile);\n                this.buildTile(tile);\n            }\n        }\n    }\n\n    // Sort and build a list of tiles\n    buildTiles(tiles) {\n        Tile.sort(tiles).forEach(tile => this.buildTile(tile));\n        this.checkBuildQueue();\n    }\n\n    buildTile(tile, options) {\n        this.tileBuildStart(tile.key);\n        this.updateVisibility(tile);\n        tile.update();\n        tile.build(this.scene.generation, options);\n    }\n\n    // Called on main thread when a web worker completes processing for a single tile (initial load, or rebuild)\n    buildTileStylesCompleted({ tile, progress }) {\n        // Removed this tile during load?\n        if (this.tiles[tile.key] == null) {\n            log('trace', `discarded tile ${tile.key} in TileManager.buildTileStylesCompleted because previously removed`);\n            Tile.abortBuild(tile);\n            this.updateTileStates();\n        }\n        // Built with an outdated scene configuration?\n        else if (tile.generation !== this.scene.generation) {\n            log('debug', `discarded tile ${tile.key} in TileManager.buildTileStylesCompleted because built with ` +\n                `scene config gen ${tile.generation}, current ${this.scene.generation}`);\n            Tile.abortBuild(tile);\n            this.updateTileStates();\n        }\n        else {\n            // Update tile with properties from worker\n            if (this.tiles[tile.key]) {\n                tile = this.tiles[tile.key].merge(tile);\n            }\n\n            if (progress.done) {\n                tile.built = true;\n            }\n\n            tile.buildMeshes(this.scene.styles, progress);\n            this.updateTileStates();\n            this.scene.requestRedraw();\n        }\n\n        if (progress.done) {\n            this.tileBuildStop(tile.key);\n        }\n    }\n\n    // Called on main thread when web worker encounters an error building a tile\n    buildTileError(tile) {\n        log('error', `Error building tile ${tile.key}:`, tile.error);\n        this.forgetTile(tile.key);\n        Tile.abortBuild(tile);\n    }\n\n    // Track tile build state\n    tileBuildStart(key) {\n        this.building_tiles = this.building_tiles || {};\n        this.building_tiles[key] = true;\n        log('trace', `tileBuildStart for ${key}: ${Object.keys(this.building_tiles).length}`);\n    }\n\n    tileBuildStop(key) {\n        // Done building?\n        if (this.building_tiles) {\n            log('trace', `tileBuildStop for ${key}: ${Object.keys(this.building_tiles).length}`);\n            delete this.building_tiles[key];\n            this.checkBuildQueue();\n        }\n    }\n\n    // Check status of tile building queue and notify scene when we're done\n    checkBuildQueue() {\n        if (!this.building_tiles || Object.keys(this.building_tiles).length === 0) {\n            this.building_tiles = null;\n            this.scene.tileManagerBuildDone();\n        }\n    }\n\n    // Get a debug property across tiles\n    getDebugProp(prop, filter) {\n        var vals = [];\n        for (var t in this.tiles) {\n            if (this.tiles[t].debug[prop] != null && (typeof filter !== 'function' || filter(this.tiles[t]) === true)) {\n                vals.push(this.tiles[t].debug[prop]);\n            }\n        }\n        return vals;\n    }\n\n    // Sum of a debug property across tiles\n    getDebugSum(prop, filter) {\n        var sum = 0;\n        for (var t in this.tiles) {\n            if (this.tiles[t].debug[prop] != null && (typeof filter !== 'function' || filter(this.tiles[t]) === true)) {\n                sum += this.tiles[t].debug[prop];\n            }\n        }\n        return sum;\n    }\n\n    // Average of a debug property across tiles\n    getDebugAverage(prop, filter) {\n        return this.getDebugSum(prop, filter) / Object.keys(this.tiles).length;\n    }\n\n}\n",
@@ -548,6 +548,6 @@
     "let fs = require('fs');\nlet pkg = JSON.parse(fs.readFileSync(__dirname + '/../../package.json', 'utf8'));\nlet version;\nexport default version = 'v' + pkg.version;\n",
     "/*jshint worker: true*/\n\n// WorkerBroker routes messages between web workers and the main thread, allowing for simpler\n// async code via promises. Example usage:\n//\n// In web worker, register self as a callable \"target\", and define a method:\n//\n//     WorkerBroker.addTarget('self', self);\n//\n//     self.square = function (x) {\n//         return x * x;\n//     };\n//\n// In main thread, invoke that method and receive the result (if any) as a promise.\n//\n//     worker = new Worker(...);\n//     WorkerBroker.addWorker(worker);\n//\n//     WorkerBroker.postMessage(worker, 'self.square', 5).then(function(y) {\n//         console.log(y);\n//     });\n//\n//     -> prints 25\n//\n// Async code:\n//\n// For synchronous code that must pass a return value to the main thread, the function can simply\n// return an immediate value (see example above). For cases where the worker method needs to run\n// asynchronous code, the function can return a promise, and the resolved or rejected value will\n// be sent back to the main thread when the promise is fulfilled.\n//\n// Error handling:\n//\n// If the worker method either throws an error, or returns a promise that is rejected, it will be\n// sent back to the main thread as a promise rejection. These two examples are equivalent:\n//\n//     In worker, throwing an error:\n//\n//         self.broken = function () {\n//             throw new Error('error in worker!');\n//         };\n//\n//     In worker, returning a rejected promise:\n//\n//         self.broken = function () {\n//             return Promise.reject(new Error('error in worker!'));\n//         };\n//\n//     In main thread, both errors are received as a promise rejection:\n//\n//         WorkerBroker.postMessage(worker, 'self.broken').then(\n//             // Promise resolved\n//             function() {\n//                 console.log('success!');\n//             },\n//             // Promise rejected\n//             function(error) {\n//                 console.log('error!', error);\n//             });\n//\n//         -> prints 'error! error in worker'\n//\n// Calling from worker to main thread:\n//\n// The same style of calls can be made *from* a web worker, to the main thread. The API is the same\n// with the exception that the first argument, 'worker', is not needed for WorkerBroker.postMessage(),\n// since the main thread is the implicit target.\n//\n// In main thread, define a method and register it:\n//\n//     var geometry = {\n//         length: function(x, y) {\n//             return Math.sqrt(x * x + y * y);\n//         }\n//     };\n//\n//     WorkerBroker.addTarget('geometry', geometry);\n//\n// In worker thread):\n//\n//     WorkerBroker.postMessage('geometry.length', 3, 4).then(function(d) {\n//         console.log(d);\n//     });\n//\n//     -> prints 5\n//\n\nimport Thread from './thread';\nimport log from './log';\n\nvar WorkerBroker;\nexport default WorkerBroker = {};\n\n// Global list of all worker messages\n// Uniquely tracks every call made between main thread and a worker\nvar message_id = 0;\nvar messages = {};\n\n// Register an object to receive calls from other thread\nvar targets = {};\nWorkerBroker.addTarget = function (name, target) {\n    targets[name] = target;\n};\n\n// Given a dot-notation-style method name, e.g. 'Object.object.method',\n// find the object to call the method on from the list of registered targets\nfunction findTarget (method) {\n    var chain = [];\n    if (typeof method === 'string') {\n        chain = method.split('.');\n        method = chain.pop();\n    }\n\n    var target = targets;\n\n    for (let m=0; m < chain.length; m++) {\n        if (target[chain[m]]) {\n            target = target[chain[m]];\n        }\n        else {\n            return [];\n        }\n    }\n\n    return [method, target];\n}\n\n// Main thread:\n// - Send messages to workers, and optionally receive an async response as a promise\n// - Receive messages from workers, and optionally send an async response back as a promise\nfunction setupMainThread () {\n\n    // Send a message to a worker, and optionally get an async response\n    // Arguments:\n    //   - worker: one or more web worker instances to send the message to (single value or array)\n    //   - method: the method with this name, specified with dot-notation, will be invoked in the worker\n    //   - message: spread of arguments to call the method with\n    // Returns:\n    //   - a promise that will be fulfilled if the worker method returns a value (could be immediately, or async)\n    //\n    WorkerBroker.postMessage = function (worker, method, ...message) {\n        // If more than one worker specified, post to multiple\n        if (Array.isArray(worker)) {\n            return Promise.all(\n                worker.map(w => WorkerBroker.postMessage(w, method, ...message))\n            );\n        }\n\n        // Track state of this message\n        var promise = new Promise((resolve, reject) => {\n            messages[message_id] = { method, message, resolve, reject };\n        });\n\n\n        let payload, transferables = [];\n\n        if (message && message.length === 1 && message[0] instanceof WorkerBroker.withTransferables) {\n            transferables = message[0].transferables;\n            message = message[0].value;\n        }\n\n        payload = {\n            type: 'main_send',      // mark message as method invocation from main thread\n            message_id,             // unique id for this message, for life of program\n            method,                 // will dispatch to a function of this name within the worker\n            message                 // message payload\n        };\n\n        payload = maybeEncode(payload, transferables);\n        worker.postMessage(payload, transferables.map(t => t.object));\n        freeTransferables(transferables);\n        if (transferables.length > 0) {\n            log('trace', `'${method}' transferred ${transferables.length} objects to worker thread`);\n        }\n\n        message_id++;\n        return promise;\n    };\n\n    // Add a worker to communicate with - each worker must be registered from the main thread\n    WorkerBroker.addWorker = function (worker) {\n        if (!(worker instanceof Worker)) {\n            throw Error(`Worker broker could not add non-Worker object`, worker);\n        }\n\n        worker.addEventListener('message', function WorkerBrokerMainThreadHandler(event) {\n            let data = maybeDecode(event.data);\n            let id = data.message_id;\n\n            // Listen for messages coming back from the worker, and fulfill that message's promise\n            if (data.type === 'worker_reply') {\n                // Pass the result to the promise\n                if (messages[id]) {\n                    if (data.error) {\n                        messages[id].reject(data.error);\n                    }\n                    else {\n                        messages[id].resolve(data.message);\n                    }\n                    delete messages[id];\n                }\n            }\n            // Listen for messages initiating a call from the worker, dispatch them,\n            // and send any return value back to the worker\n            // Unique id for this message & return call to main thread\n            else if (data.type === 'worker_send' && id != null) {\n                // Call the requested method and save the return value\n                var [method_name, target] = findTarget(data.method);\n                if (!target) {\n                    throw Error(`Worker broker could not dispatch message type ${data.method} on target ${data.target} because no object with that name is registered on main thread`);\n                }\n\n                var method = (typeof target[method_name] === 'function') && target[method_name];\n                if (!method) {\n                    throw Error(`Worker broker could not dispatch message type ${data.method} on target ${data.target} because object has no method with that name`);\n                }\n\n                var result, error;\n                try {\n                    result = method.apply(target, data.message);\n                }\n                catch(e) {\n                    // Thrown errors will be passed back (in string form) to worker\n                    error = e;\n                }\n\n                // Send return value to worker\n                let payload, transferables = [];\n\n                // Async result\n                if (result instanceof Promise) {\n                    result.then((value) => {\n                        if (value instanceof WorkerBroker.withTransferables) {\n                            transferables = value.transferables;\n                            value = value.value[0];\n                        }\n\n                        payload = {\n                            type: 'main_reply',\n                            message_id: id,\n                            message: value\n                        };\n                        payload = maybeEncode(payload, transferables);\n                        worker.postMessage(payload, transferables.map(t => t.object));\n                        freeTransferables(transferables);\n                        if (transferables.length > 0) {\n                            log('trace', `'${method_name}' transferred ${transferables.length} objects to worker thread`);\n                        }\n\n                    }, (error) => {\n                        worker.postMessage({\n                            type: 'main_reply',\n                            message_id: id,\n                            error: (error instanceof Error ? `${error.message}: ${error.stack}` : error)\n                        });\n                    });\n                }\n                // Immediate result\n                else {\n                    if (result instanceof WorkerBroker.withTransferables) {\n                        transferables = result.transferables;\n                        result = result.value[0];\n                    }\n\n                    payload = {\n                        type: 'main_reply',\n                        message_id: id,\n                        message: result,\n                        error: (error instanceof Error ? `${error.message}: ${error.stack}` : error)\n                    };\n                    payload = maybeEncode(payload, transferables);\n                    worker.postMessage(payload, transferables.map(t => t.object));\n                    freeTransferables(transferables);\n                    if (transferables.length > 0) {\n                        log('trace', `'${method_name}' transferred ${transferables.length} objects to worker thread`);\n                    }\n                }\n            }\n        });\n\n    };\n\n    // Expose for debugging\n    WorkerBroker.getMessages = function () {\n        return messages;\n    };\n\n    WorkerBroker.getMessageId = function () {\n        return message_id;\n    };\n\n}\n\n// Worker threads:\n// - Receive messages from main thread, and optionally send an async response back as a promise\n// - Send messages to main thread, and optionally receive an async response as a promise\nfunction setupWorkerThread () {\n\n    // Send a message to the main thread, and optionally get an async response as a promise\n    // Arguments:\n    //   - method: the method with this name, specified with dot-notation, will be invoked on the main thread\n    //   - message: array of arguments to call the method with\n    // Returns:\n    //   - a promise that will be fulfilled if the main thread method returns a value (could be immediately, or async)\n    //\n    WorkerBroker.postMessage = function (method, ...message) {\n        // Track state of this message\n        var promise = new Promise((resolve, reject) => {\n            messages[message_id] = { method, message, resolve, reject };\n        });\n\n       let payload, transferables = [];\n\n        if (message && message.length === 1 && message[0] instanceof WorkerBroker.withTransferables) {\n            transferables = message[0].transferables;\n            message = message[0].value;\n        }\n\n        payload = {\n            type: 'worker_send',    // mark message as method invocation from worker\n            message_id,             // unique id for this message, for life of program\n            method,                 // will dispatch to a method of this name on the main thread\n            message                 // message payload\n        };\n\n        payload = maybeEncode(payload, transferables);\n        self.postMessage(payload, transferables.map(t => t.object));\n        freeTransferables(transferables);\n        if (transferables.length > 0) {\n            log('trace', `'${method}' transferred ${transferables.length} objects to main thread`);\n        }\n\n        message_id++;\n        return promise;\n    };\n\n    self.addEventListener('message', function WorkerBrokerWorkerThreadHandler(event) {\n        let data = maybeDecode(event.data);\n        let id = data.message_id;\n\n        // Listen for messages coming back from the main thread, and fulfill that message's promise\n        if (data.type === 'main_reply') {\n            // Pass the result to the promise\n            if (messages[id]) {\n                if (data.error) {\n                    messages[id].reject(data.error);\n                }\n                else {\n                    messages[id].resolve(data.message);\n                }\n                delete messages[id];\n            }\n        }\n        // Receive messages from main thread, dispatch them, and send back a reply\n        // Unique id for this message & return call to main thread\n        else if (data.type === 'main_send' && id != null) {\n            // Call the requested worker method and save the return value\n            var [method_name, target] = findTarget(data.method);\n            if (!target) {\n                throw Error(`Worker broker could not dispatch message type ${data.method} on target ${data.target} because no object with that name is registered on main thread`);\n            }\n\n            var method = (typeof target[method_name] === 'function') && target[method_name];\n\n            if (!method) {\n                throw Error(`Worker broker could not dispatch message type ${data.method} because worker has no method with that name`);\n            }\n\n            var result, error;\n            try {\n                result = method.apply(target, data.message);\n            }\n            catch(e) {\n                // Thrown errors will be passed back (in string form) to main thread\n                error = e;\n            }\n\n            // Send return value to main thread\n            let payload, transferables = [];\n\n            // Async result\n            if (result instanceof Promise) {\n                result.then((value) => {\n                    if (value instanceof WorkerBroker.withTransferables) {\n                        transferables = value.transferables;\n                        value = value.value[0];\n                    }\n\n                    payload = {\n                        type: 'worker_reply',\n                        message_id: id,\n                        message: value\n                    };\n                    payload = maybeEncode(payload, transferables);\n                    self.postMessage(payload, transferables.map(t => t.object));\n                    freeTransferables(transferables);\n                    if (transferables.length > 0) {\n                        log('trace', `'${method_name}' transferred ${transferables.length} objects to main thread`);\n                    }\n                }, (error) => {\n                    self.postMessage({\n                        type: 'worker_reply',\n                        message_id: id,\n                        error: (error instanceof Error ? `${error.message}: ${error.stack}` : error)\n                    });\n                });\n            }\n            // Immediate result\n            else {\n                if (result instanceof WorkerBroker.withTransferables) {\n                    transferables = result.transferables;\n                    result = result.value[0];\n                }\n\n                payload = {\n                    type: 'worker_reply',\n                    message_id: id,\n                    message: result,\n                    error: (error instanceof Error ? `${error.message}: ${error.stack}` : error)\n                };\n                payload = maybeEncode(payload, transferables);\n                self.postMessage(payload, transferables.map(t => t.object));\n                freeTransferables(transferables);\n                if (transferables.length > 0) {\n                    log('trace', `'${method_name}' transferred ${transferables.length} objects to main thread`);\n                }\n            }\n        }\n    });\n\n}\n\n// Special value wrapper, to indicate that we want to find and include transferable objects in the message\nWorkerBroker.withTransferables = function (...value) {\n    if (!(this instanceof WorkerBroker.withTransferables)) {\n        return new WorkerBroker.withTransferables(...value);\n    }\n\n    this.value = value;\n    this.transferables = findTransferables(this.value);\n};\n\n// Build a list of transferable objects from a source object\n// Returns a list of info about each transferable:\n//   - object: the actual transferable object\n//   - parent: the parent object that the transferable is a property of (if any)\n//   - property: the property name of the transferable on the parent object (if any)\n// TODO: add option in case you DON'T want to transfer objects\nfunction findTransferables(source, parent = null, property = null, list = []) {\n    if (!source) {\n         return list;\n    }\n\n    if (Array.isArray(source)) {\n        // Check each array element\n        source.forEach((x, i) => findTransferables(x, source, i, list));\n    }\n    else if (typeof source === 'object') {\n        // Is the object a transferable array buffer?\n        if (source instanceof ArrayBuffer) {\n            list.push({ object: source, parent, property });\n        }\n        // Or looks like a typed array (has an array buffer property)?\n        else if (source.buffer instanceof ArrayBuffer) {\n            list.push({ object: source.buffer, parent, property });\n        }\n        // Otherwise check each property\n        else {\n            for (let prop in source) {\n                findTransferables(source[prop], source, prop, list);\n            }\n        }\n    }\n    return list;\n}\n\n// Remove neutered transferables from parent objects, as they should no longer be accessed after transfer\nfunction freeTransferables(transferables) {\n    if (!Array.isArray(transferables)) {\n        return;\n    }\n    transferables.filter(t => t.parent && t.property).forEach(t => delete t.parent[t.property]);\n}\n\n// Message payload can be stringified for faster transfer, if it does not include transferable objects\nfunction maybeEncode (payload, transferables) {\n    if (transferables.length === 0) {\n        payload = JSON.stringify(payload);\n    }\n    return payload;\n}\n\n// Parse stringified message payload\nfunction maybeDecode (data) {\n    return (typeof data === 'string' ? JSON.parse(data) : data);\n}\n\n// Setup this thread as appropriate\nif (Thread.is_main) {\n    setupMainThread();\n}\n\nif (Thread.is_worker) {\n    setupWorkerThread();\n}\n",
     "/*** Vector functions - vectors provided as [x, y] or [x, y, z] arrays ***/\n\nvar Vector;\nexport default Vector = {};\n\nVector.set = function (v) {\n    var V = [];\n    var lim = v.length;\n    for (var i = 0; i < lim; i++) {\n        V[i] = v[i];\n    }\n    return V;\n};\n\nVector.neg = function (v) {\n    var V = [];\n    var lim = v.length;\n    for (var i = 0; i < lim; i++) {\n        V[i] = -v[i];\n    }\n    return V;\n};\n\n// Addition of two vectors\nVector.add = function (v1, v2) {\n    var v = [];\n    var lim = Math.min(v1.length,v2.length);\n    for (var i = 0; i < lim; i++) {\n        v[i] = v1[i] + v2[i];\n    }\n    return v;\n};\n\n// Substraction of two vectors\nVector.sub = function (v1, v2) {\n    var v = [];\n    var lim = Math.min(v1.length,v2.length);\n\n    for (var i = 0; i < lim; i++) {\n        v[i] = v1[i] - v2[i];\n    }\n    return v;\n};\n\nVector.signed_area = function (v1, v2, v3) {\n    return (v2[0]-v1[0])*(v3[1]-v1[1]) - (v3[0]-v1[0])*(v2[1]-v1[1]);\n};\n\n// Multiplication of two vectors, or a vector and a scalar\nVector.mult = function (v1, v2) {\n    var v = [],\n        len = v1.length,\n        i;\n\n    if (typeof v2 === 'number') {\n        // Mulitply by scalar\n        for (i = 0; i < len; i++) {\n            v[i] = v1[i] * v2;\n        }\n    }\n    else {\n        // Multiply two vectors\n        len = Math.min(v1.length,v2.length);\n        for (i = 0; i < len; i++) {\n            v[i] = v1[i] * v2[i];\n        }\n    }\n    return v;\n};\n\n// Division of two vectors\nVector.div = function (v1, v2) {\n    var v = [],\n        i;\n    if(typeof v2 === 'number'){\n        // Divide by scalar\n        for (i = 0; i < v1.length; i++){\n            v[i] = v1[i] / v2;\n        }\n    } else {\n        // Divide to vectors\n        var len = Math.min(v1.length,v2.length);\n        for (i = 0; i < len; i++) {\n            v[i] = v1[i] / v2[i];\n        }\n    }\n    return v;\n};\n\n// Get 2D perpendicular\nVector.perp = function (v1, v2) {\n    return [\n        v2[1] - v1[1],\n        v1[0] - v2[0]\n    ];\n};\n\n// Get 2D vector rotated\nVector.rot = function (v, a) {\n    var c = Math.cos(a);\n    var s = Math.sin(a);\n    return [\n        v[0] * c - v[1] * s,\n        v[0] * s + v[1] * c\n    ];\n};\n\n// Get 2D counter-clockwise angle\n// Angles in quadrant I and II are mapped to [0, PI)\n// Angles in quadrant III and IV are mapped to [-PI, 0]\nVector.angle = function ([x, y]) {\n    return Math.atan2(y,x);\n};\n\n// Get angle between two vectors\nVector.angleBetween = function(A, B){\n    var delta = Vector.dot(\n        Vector.normalize(A),\n        Vector.normalize(B)\n    );\n    if (delta > 1) {delta = 1;} // protect against floating point error\n    return Math.acos(delta);\n};\n\n// Compare two points\nVector.isEqual = function (v1, v2) {\n    var len = v1.length;\n    for (var i = 0; i < len; i++) {\n        if (v1[i] !== v2[i]){\n            return false;\n        }\n    }\n    return true;\n};\n\n// Vector length squared\nVector.lengthSq = function (v) {\n    if (v.length === 2) {\n        return (v[0]*v[0] + v[1]*v[1]);\n    }\n    else if (v.length >= 3) {\n        return (v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);\n    }\n    return 0;\n};\n\n// Vector length\nVector.length = function (v) {\n    return Math.sqrt(Vector.lengthSq(v));\n};\n\n// Normalize a vector\nVector.normalize = function (v) {\n    var d;\n    if (v.length === 2) {\n        d = v[0]*v[0] + v[1]*v[1];\n\n        if (d === 1) {\n            return v;\n        }\n\n        d = Math.sqrt(d);\n\n        if (d !== 0) {\n            return [v[0] / d, v[1] / d];\n        }\n        return [0, 0];\n    } else if (v.length >= 3) {\n        d = v[0]*v[0] + v[1]*v[1] + v[2]*v[2];\n\n        if (d === 1) {\n            return v;\n        }\n\n        d = Math.sqrt(d);\n\n        if (d !== 0) {\n            return [v[0] / d, v[1] / d, v[2] / d];\n        }\n    }\n    return [0, 0, 0];\n};\n\n// Cross product of two vectors\nVector.cross  = function (v1, v2) {\n    if (v1.length === 2){\n        return v1[0] * v2[1] - v1[1] * v2[0];\n    }\n    else if (v1.length === 3){\n        return [\n            (v1[1] * v2[2]) - (v1[2] * v2[1]),\n            (v1[2] * v2[0]) - (v1[0] * v2[2]),\n            (v1[0] * v2[1]) - (v1[1] * v2[0])\n        ];\n    }\n};\n\n// Dot product of two vectors\nVector.dot = function (v1, v2) {\n    var n = 0;\n    var lim = Math.min(v1.length, v2.length);\n    for (var i = 0; i < lim; i++) {\n        n += v1[i] * v2[i];\n    }\n    return n;\n};\n",
-    "import Geo from './geo';\nimport Tile from './tile';\nimport Camera from './camera';\nimport Utils from './utils/utils';\nimport subscribeMixin from './utils/subscribe';\nimport log from './utils/log';\n\nexport const VIEW_PAN_SNAP_TIME = 0.5;\n\nexport default class View {\n\n    constructor (scene, options) {\n        subscribeMixin(this);\n\n        this.scene = scene;\n        this.createMatrices();\n\n        this.zoom = null;\n        this.center = null;\n        this.bounds = null;\n        this.meters_per_pixel = null;\n\n        this.panning = false;\n        this.panning_stop_at = 0;\n        this.pan_snap_timer = 0;\n        this.zooming = false;\n        this.zoom_direction = 0;\n\n        // Size of viewport in CSS pixels, device pixels, and mercator meters\n        this.size = {\n            css: {},\n            device: {},\n            meters: {}\n        };\n        this.aspect = null;\n\n        this.buffer = 0;\n        this.continuous_zoom = (typeof options.continuousZoom === 'boolean') ? options.continuousZoom : true;\n        this.tile_simplification_level = 0; // level-of-detail downsampling to apply to tile loading\n        this.preserve_tiles_within_zoom = 1;\n\n        this.reset();\n    }\n\n    // Reset state before scene config is updated\n    reset () {\n        this.createCamera();\n    }\n\n    // Create camera\n    createCamera () {\n        let active_camera = this.getActiveCamera();\n        if (active_camera) {\n            this.camera = Camera.create(active_camera, this, this.scene.config.cameras[active_camera]);\n            this.camera.updateView();\n        }\n    }\n\n    // Get active camera - for public API\n    getActiveCamera () {\n        if (this.scene.config && this.scene.config.cameras) {\n            for (let name in this.scene.config.cameras) {\n                if (this.scene.config.cameras[name].active) {\n                    return name;\n                }\n            }\n\n            // If no camera set as active, use first one\n            let keys = Object.keys(this.scene.config.cameras);\n            return keys.length && keys[0];\n        }\n    }\n\n    // Set active camera and recompile - for public API\n    setActiveCamera (name) {\n        let prev = this.getActiveCamera();\n        if (this.scene.config.cameras[name]) {\n            this.scene.config.cameras[name].active = true;\n\n            // Clear previously active camera\n            if (prev && prev !== name && this.scene.config.cameras[prev]) {\n                delete this.scene.config.cameras[prev].active;\n            }\n        }\n\n        this.scene.updateConfig({ rebuild: false });\n        return this.getActiveCamera();\n    }\n\n    // Update method called once per frame\n    update () {\n        this.camera.update();\n        this.pan_snap_timer = ((+new Date()) - this.panning_stop_at) / 1000;\n    }\n\n    // Set logical pixel size of viewport\n    setViewportSize (width, height) {\n        this.size.css = { width, height };\n        this.size.device = {\n            width: Math.round(this.size.css.width * Utils.device_pixel_ratio),\n            height: Math.round(this.size.css.height * Utils.device_pixel_ratio)\n        };\n        this.aspect = this.size.css.width / this.size.css.height;\n        this.updateBounds();\n    }\n\n    // Set the map view, can be passed an object with lat/lng and/or zoom\n    setView ({ lng, lat, zoom } = {}) {\n        var changed = false;\n\n        // Set center\n        if (typeof lng === 'number' && typeof lat === 'number') {\n            if (!this.center || lng !== this.center.lng || lat !== this.center.lat) {\n                changed = true;\n                this.center = { lng: Geo.wrapLng(lng), lat };\n            }\n        }\n\n        // Set zoom\n        if (typeof zoom === 'number' && zoom !== this.zoom) {\n            changed = true;\n            this.setZoom(zoom);\n        }\n\n        if (changed) {\n            this.updateBounds();\n        }\n        return changed;\n    }\n\n    setZoom (zoom) {\n        if (this.zooming) {\n            this.zooming = false;\n        }\n        else {\n            this.last_zoom = this.zoom;\n        }\n\n        let last_tile_zoom = this.tile_zoom;\n        let tile_zoom = this.tileZoom(zoom);\n        if (!this.continuous_zoom) {\n            zoom = tile_zoom;\n        }\n\n        if (tile_zoom !== last_tile_zoom) {\n            this.zoom_direction = tile_zoom > last_tile_zoom ? 1 : -1;\n        }\n\n        this.last_zoom = this.zoom;\n        this.zoom = zoom;\n        this.tile_zoom = tile_zoom;\n\n        this.updateBounds();\n        this.scene.requestRedraw();\n    }\n\n    startZoom () {\n        this.last_zoom = this.zoom;\n        this.zooming = true;\n    }\n\n    // Choose the base zoom level to use for a given fractional zoom\n    baseZoom (zoom) {\n        return Math.floor(zoom);\n    }\n\n    // For a given view zoom, what tile zoom should be loaded?\n    tileZoom (view_zoom) {\n        return Math.max(this.baseZoom(view_zoom) - this.tile_simplification_level, 0);\n    }\n\n    // For a given tile zoom, what style zoom should be used?\n    styleZoom (tile_zoom) {\n        return this.baseZoom(tile_zoom) + this.tile_simplification_level;\n    }\n\n    setPanning (panning) {\n        this.panning = panning;\n        if (!this.panning) {\n            this.panning_stop_at = (+new Date());\n        }\n    }\n\n    ready () {\n        // TODO: better concept of \"readiness\" state?\n        if (typeof this.size.css.width !== 'number' ||\n            typeof this.size.css.height !== 'number' ||\n            this.center == null ||\n            typeof this.zoom !== 'number') {\n             return false;\n        }\n        return true;\n    }\n\n    // Calculate viewport bounds based on current center and zoom\n    updateBounds () {\n        if (!this.ready()) {\n            return;\n        }\n\n        this.meters_per_pixel = Geo.metersPerPixel(this.zoom);\n\n        // Size of the half-viewport in meters at current zoom\n        this.size.meters = {\n            x: this.size.css.width * this.meters_per_pixel,\n            y: this.size.css.height * this.meters_per_pixel\n        };\n\n        // Center of viewport in meters, and tile\n        let [x, y] = Geo.latLngToMeters([this.center.lng, this.center.lat]);\n        this.center.meters = { x, y };\n\n        this.center.tile = Geo.tileForMeters([this.center.meters.x, this.center.meters.y], this.tile_zoom);\n\n        // Bounds in meters\n        this.bounds = {\n            sw: {\n                x: this.center.meters.x - this.size.meters.x / 2,\n                y: this.center.meters.y - this.size.meters.y / 2\n            },\n            ne: {\n                x: this.center.meters.x + this.size.meters.x / 2,\n                y: this.center.meters.y + this.size.meters.y / 2\n            }\n        };\n\n        this.scene.tile_manager.updateTilesForView();\n\n        this.trigger('move');\n        this.scene.requestRedraw(); // TODO automate via move event?\n    }\n\n    findVisibleTileCoordinates () {\n        if (!this.bounds) {\n            return [];\n        }\n\n        let z = this.tile_zoom;\n        let sw = Geo.tileForMeters([this.bounds.sw.x, this.bounds.sw.y], z);\n        let ne = Geo.tileForMeters([this.bounds.ne.x, this.bounds.ne.y], z);\n\n        let coords = [];\n        for (let x = sw.x - this.buffer; x <= ne.x + this.buffer; x++) {\n            for (let y = ne.y - this.buffer; y <= sw.y + this.buffer; y++) {\n                coords.push(Tile.coord({ x, y, z }));\n            }\n        }\n        return coords;\n    }\n\n    // Remove tiles too far outside of view\n    pruneTilesForView () {\n        // TODO: will this function ever be called when view isn't ready?\n        if (!this.ready()) {\n            return;\n        }\n\n        // Remove tiles that are a specified # of tiles outside of the viewport border\n        let border_tiles = [\n            Math.ceil((Math.floor(this.size.css.width / Geo.tile_size) + 2) / 2),\n            Math.ceil((Math.floor(this.size.css.height / Geo.tile_size) + 2) / 2)\n        ];\n\n        this.scene.tile_manager.removeTiles(tile => {\n            // Ignore visible tiles\n            if (tile.visible || tile.proxy_for) {\n                return false;\n            }\n\n            // Remove tiles outside given zoom that are still loading\n            if (tile.loading && tile.style_zoom !== this.tile_zoom) {\n                return true;\n            }\n\n            // Discard if too far from current zoom\n            let zdiff = Math.abs(tile.style_zoom - this.tile_zoom);\n            if (zdiff > this.preserve_tiles_within_zoom) {\n                return true;\n            }\n\n            // Handle tiles at different zooms\n            let coords = Tile.coordinateAtZoom(tile.coords, this.tile_zoom);\n\n            // Discard tiles outside an area surrounding the viewport\n            if (Math.abs(coords.x - this.center.tile.x) - border_tiles[0] > this.buffer) {\n                log('trace', `View: remove tile ${tile.key} (as ${coords.x}/${coords.y}/${this.tile_zoom}) for being too far out of visible area ***`);\n                return true;\n            }\n            else if (Math.abs(coords.y - this.center.tile.y) - border_tiles[1] > this.buffer) {\n                log('trace', `View: remove tile ${tile.key} (as ${coords.x}/${coords.y}/${this.tile_zoom}) for being too far out of visible area ***`);\n                return true;\n            }\n            return false;\n        });\n    }\n\n    // Allocate model-view matrices\n    // 64-bit versions are for CPU calcuations\n    // 32-bit versions are downsampled and sent to GPU\n    createMatrices () {\n        this.matrices = {};\n        this.matrices.model = new Float64Array(16);\n        this.matrices.model32 = new Float32Array(16);\n        this.matrices.model_view = new Float64Array(16);\n        this.matrices.model_view32 = new Float32Array(16);\n        this.matrices.normal = new Float64Array(9);\n        this.matrices.normal32 = new Float32Array(9);\n        this.matrices.inverse_normal32 = new Float32Array(9);\n    }\n\n    // Calculate and set model/view and normal matrices for a tile\n    setupTile (tile, program) {\n        // Tile-specific state\n        // TODO: calc these once per tile (currently being needlessly re-calculated per-tile-per-style)\n        tile.setupProgram(this.matrices, program);\n\n        // Model-view and normal matrices\n        this.camera.setupMatrices(this.matrices, program);\n    }\n\n    // Set general uniforms that must be updated once per program\n    setupProgram (program) {\n        program.uniform('2fv', 'u_resolution', [this.size.device.width, this.size.device.height]);\n        program.uniform('3fv', 'u_map_position', [this.center.meters.x, this.center.meters.y, this.zoom]);\n        program.uniform('1f', 'u_meters_per_pixel', this.meters_per_pixel);\n        program.uniform('1f', 'u_device_pixel_ratio', Utils.device_pixel_ratio);\n        program.uniform('1f', 'u_view_pan_snap_timer', this.pan_snap_timer);\n        program.uniform('1i', 'u_view_panning', this.panning);\n\n        this.camera.setupProgram(program);\n    }\n\n    // View requires some animation, such as after panning stops\n    isAnimating () {\n        return (this.pan_snap_timer <= VIEW_PAN_SNAP_TIME);\n    }\n\n}\n"
+    "import Geo from './geo';\nimport Tile from './tile';\nimport Camera from './camera';\nimport Utils from './utils/utils';\nimport subscribeMixin from './utils/subscribe';\nimport log from './utils/log';\n\nexport const VIEW_PAN_SNAP_TIME = 0.5;\n\nexport default class View {\n\n    constructor (scene, options) {\n        subscribeMixin(this);\n\n        this.scene = scene;\n        this.createMatrices();\n\n        this.zoom = null;\n        this.center = null;\n        this.bounds = null;\n        this.meters_per_pixel = null;\n\n        this.panning = false;\n        this.panning_stop_at = 0;\n        this.pan_snap_timer = 0;\n        this.zooming = false;\n        this.zoom_direction = 0;\n\n        // Size of viewport in CSS pixels, device pixels, and mercator meters\n        this.size = {\n            css: {},\n            device: {},\n            meters: {}\n        };\n        this.aspect = null;\n\n        this.buffer = 0;\n        this.continuous_zoom = (typeof options.continuousZoom === 'boolean') ? options.continuousZoom : true;\n        this.wrap = (options.wrapView === false) ? false : true;\n        this.tile_simplification_level = 0; // level-of-detail downsampling to apply to tile loading\n        this.preserve_tiles_within_zoom = 1;\n\n        this.reset();\n    }\n\n    // Reset state before scene config is updated\n    reset () {\n        this.createCamera();\n    }\n\n    // Create camera\n    createCamera () {\n        let active_camera = this.getActiveCamera();\n        if (active_camera) {\n            this.camera = Camera.create(active_camera, this, this.scene.config.cameras[active_camera]);\n            this.camera.updateView();\n        }\n    }\n\n    // Get active camera - for public API\n    getActiveCamera () {\n        if (this.scene.config && this.scene.config.cameras) {\n            for (let name in this.scene.config.cameras) {\n                if (this.scene.config.cameras[name].active) {\n                    return name;\n                }\n            }\n\n            // If no camera set as active, use first one\n            let keys = Object.keys(this.scene.config.cameras);\n            return keys.length && keys[0];\n        }\n    }\n\n    // Set active camera and recompile - for public API\n    setActiveCamera (name) {\n        let prev = this.getActiveCamera();\n        if (this.scene.config.cameras[name]) {\n            this.scene.config.cameras[name].active = true;\n\n            // Clear previously active camera\n            if (prev && prev !== name && this.scene.config.cameras[prev]) {\n                delete this.scene.config.cameras[prev].active;\n            }\n        }\n\n        this.scene.updateConfig({ rebuild: false });\n        return this.getActiveCamera();\n    }\n\n    // Update method called once per frame\n    update () {\n        this.camera.update();\n        this.pan_snap_timer = ((+new Date()) - this.panning_stop_at) / 1000;\n    }\n\n    // Set logical pixel size of viewport\n    setViewportSize (width, height) {\n        this.size.css = { width, height };\n        this.size.device = {\n            width: Math.round(this.size.css.width * Utils.device_pixel_ratio),\n            height: Math.round(this.size.css.height * Utils.device_pixel_ratio)\n        };\n        this.aspect = this.size.css.width / this.size.css.height;\n        this.updateBounds();\n    }\n\n    // Set the map view, can be passed an object with lat/lng and/or zoom\n    setView ({ lng, lat, zoom } = {}) {\n        var changed = false;\n\n        // Set center\n        if (typeof lng === 'number' && typeof lat === 'number') {\n            if (!this.center || lng !== this.center.lng || lat !== this.center.lat) {\n                changed = true;\n                this.center = { lng, lat };\n            }\n        }\n\n        // Set zoom\n        if (typeof zoom === 'number' && zoom !== this.zoom) {\n            changed = true;\n            this.setZoom(zoom);\n        }\n\n        if (changed) {\n            this.updateBounds();\n        }\n        return changed;\n    }\n\n    setZoom (zoom) {\n        if (this.zooming) {\n            this.zooming = false;\n        }\n        else {\n            this.last_zoom = this.zoom;\n        }\n\n        let last_tile_zoom = this.tile_zoom;\n        let tile_zoom = this.tileZoom(zoom);\n        if (!this.continuous_zoom) {\n            zoom = tile_zoom;\n        }\n\n        if (tile_zoom !== last_tile_zoom) {\n            this.zoom_direction = tile_zoom > last_tile_zoom ? 1 : -1;\n        }\n\n        this.last_zoom = this.zoom;\n        this.zoom = zoom;\n        this.tile_zoom = tile_zoom;\n\n        this.updateBounds();\n        this.scene.requestRedraw();\n    }\n\n    startZoom () {\n        this.last_zoom = this.zoom;\n        this.zooming = true;\n    }\n\n    // Choose the base zoom level to use for a given fractional zoom\n    baseZoom (zoom) {\n        return Math.floor(zoom);\n    }\n\n    // For a given view zoom, what tile zoom should be loaded?\n    tileZoom (view_zoom) {\n        return Math.max(this.baseZoom(view_zoom) - this.tile_simplification_level, 0);\n    }\n\n    // For a given tile zoom, what style zoom should be used?\n    styleZoom (tile_zoom) {\n        return this.baseZoom(tile_zoom) + this.tile_simplification_level;\n    }\n\n    setPanning (panning) {\n        this.panning = panning;\n        if (!this.panning) {\n            this.panning_stop_at = (+new Date());\n        }\n    }\n\n    ready () {\n        // TODO: better concept of \"readiness\" state?\n        if (typeof this.size.css.width !== 'number' ||\n            typeof this.size.css.height !== 'number' ||\n            this.center == null ||\n            typeof this.zoom !== 'number') {\n             return false;\n        }\n        return true;\n    }\n\n    // Calculate viewport bounds based on current center and zoom\n    updateBounds () {\n        if (!this.ready()) {\n            return;\n        }\n\n        this.meters_per_pixel = Geo.metersPerPixel(this.zoom);\n\n        // Size of the half-viewport in meters at current zoom\n        this.size.meters = {\n            x: this.size.css.width * this.meters_per_pixel,\n            y: this.size.css.height * this.meters_per_pixel\n        };\n\n        // Center of viewport in meters, and tile\n        let [x, y] = Geo.latLngToMeters([this.center.lng, this.center.lat]);\n        this.center.meters = { x, y };\n\n        this.center.tile = Geo.tileForMeters([this.center.meters.x, this.center.meters.y], this.tile_zoom);\n\n        // Bounds in meters\n        this.bounds = {\n            sw: {\n                x: this.center.meters.x - this.size.meters.x / 2,\n                y: this.center.meters.y - this.size.meters.y / 2\n            },\n            ne: {\n                x: this.center.meters.x + this.size.meters.x / 2,\n                y: this.center.meters.y + this.size.meters.y / 2\n            }\n        };\n\n        this.scene.tile_manager.updateTilesForView();\n\n        this.trigger('move');\n        this.scene.requestRedraw(); // TODO automate via move event?\n    }\n\n    findVisibleTileCoordinates () {\n        if (!this.bounds) {\n            return [];\n        }\n\n        let z = this.tile_zoom;\n        let sw = Geo.tileForMeters([this.bounds.sw.x, this.bounds.sw.y], z);\n        let ne = Geo.tileForMeters([this.bounds.ne.x, this.bounds.ne.y], z);\n\n        let range = [\n            sw.x - this.buffer, ne.x + this.buffer, // x\n            ne.y - this.buffer, sw.y + this.buffer  // y\n        ];\n\n        if (this.wrap === false) { // prevent tiles from wrapping across antimeridian\n            let tmax = (1 << z) - 1; // max xy tile number for this zoom\n            range = range.map(v => Math.min(Math.max(0, v), tmax));\n        }\n\n        let coords = [];\n        for (let x = range[0]; x <= range[1]; x++) {\n            for (let y = range[2]; y <= range[3]; y++) {\n                coords.push(Tile.coord({ x, y, z }));\n            }\n        }\n        return coords;\n    }\n\n    // Remove tiles too far outside of view\n    pruneTilesForView () {\n        // TODO: will this function ever be called when view isn't ready?\n        if (!this.ready()) {\n            return;\n        }\n\n        // Remove tiles that are a specified # of tiles outside of the viewport border\n        let border_tiles = [\n            Math.ceil((Math.floor(this.size.css.width / Geo.tile_size) + 2) / 2),\n            Math.ceil((Math.floor(this.size.css.height / Geo.tile_size) + 2) / 2)\n        ];\n\n        this.scene.tile_manager.removeTiles(tile => {\n            // Ignore visible tiles\n            if (tile.visible || tile.proxy_for) {\n                return false;\n            }\n\n            // Remove tiles outside given zoom that are still loading\n            if (tile.loading && tile.style_zoom !== this.tile_zoom) {\n                return true;\n            }\n\n            // Discard if too far from current zoom\n            let zdiff = Math.abs(tile.style_zoom - this.tile_zoom);\n            if (zdiff > this.preserve_tiles_within_zoom) {\n                return true;\n            }\n\n            // Handle tiles at different zooms\n            let coords = Tile.coordinateAtZoom(tile.coords, this.tile_zoom);\n\n            // Discard tiles outside an area surrounding the viewport\n            if (Math.abs(coords.x - this.center.tile.x) - border_tiles[0] > this.buffer) {\n                log('trace', `View: remove tile ${tile.key} (as ${coords.x}/${coords.y}/${this.tile_zoom}) for being too far out of visible area ***`);\n                return true;\n            }\n            else if (Math.abs(coords.y - this.center.tile.y) - border_tiles[1] > this.buffer) {\n                log('trace', `View: remove tile ${tile.key} (as ${coords.x}/${coords.y}/${this.tile_zoom}) for being too far out of visible area ***`);\n                return true;\n            }\n            return false;\n        });\n    }\n\n    // Allocate model-view matrices\n    // 64-bit versions are for CPU calcuations\n    // 32-bit versions are downsampled and sent to GPU\n    createMatrices () {\n        this.matrices = {};\n        this.matrices.model = new Float64Array(16);\n        this.matrices.model32 = new Float32Array(16);\n        this.matrices.model_view = new Float64Array(16);\n        this.matrices.model_view32 = new Float32Array(16);\n        this.matrices.normal = new Float64Array(9);\n        this.matrices.normal32 = new Float32Array(9);\n        this.matrices.inverse_normal32 = new Float32Array(9);\n    }\n\n    // Calculate and set model/view and normal matrices for a tile\n    setupTile (tile, program) {\n        // Tile-specific state\n        // TODO: calc these once per tile (currently being needlessly re-calculated per-tile-per-style)\n        tile.setupProgram(this.matrices, program);\n\n        // Model-view and normal matrices\n        this.camera.setupMatrices(this.matrices, program);\n    }\n\n    // Set general uniforms that must be updated once per program\n    setupProgram (program) {\n        program.uniform('2fv', 'u_resolution', [this.size.device.width, this.size.device.height]);\n        program.uniform('3fv', 'u_map_position', [this.center.meters.x, this.center.meters.y, this.zoom]);\n        program.uniform('1f', 'u_meters_per_pixel', this.meters_per_pixel);\n        program.uniform('1f', 'u_device_pixel_ratio', Utils.device_pixel_ratio);\n        program.uniform('1f', 'u_view_pan_snap_timer', this.pan_snap_timer);\n        program.uniform('1i', 'u_view_panning', this.panning);\n\n        this.camera.setupProgram(program);\n    }\n\n    // View requires some animation, such as after panning stops\n    isAnimating () {\n        return (this.pan_snap_timer <= VIEW_PAN_SNAP_TIME);\n    }\n\n}\n"
   ]
 }
\ No newline at end of file
diff --git a/dist/tangram.min.js b/dist/tangram.min.js
index 6999c372f..561719345 100644
--- a/dist/tangram.min.js
+++ b/dist/tangram.min.js
@@ -1,19 +1,19 @@
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this.reader.setIndex(r),i},readBlockEndOfCentral:function(){this.diskNumber=this.reader.readInt(2),this.diskWithCentralDirStart=this.reader.readInt(2),this.centralDirRecordsOnThisDisk=this.reader.readInt(2),this.centralDirRecords=this.reader.readInt(2),this.centralDirSize=this.reader.readInt(4),this.centralDirOffset=this.reader.readInt(4),this.zipCommentLength=this.reader.readInt(2);var e=this.reader.readData(this.zipCommentLength),t=s.uint8array?"uint8array":"array",r=i.transformTo(t,e);this.zipComment=this.loadOptions.decodeFileName(r)},readBlockZip64EndOfCentral:function(){this.zip64EndOfCentralSize=this.reader.readInt(8),this.reader.skip(4),this.diskNumber=this.reader.readInt(4),this.diskWithCentralDirStart=this.reader.readInt(4),this.centralDirRecordsOnThisDisk=this.reader.readInt(8),this.centralDirRecords=this.reader.readInt(8),this.centralDirSize=this.reader.readInt(8),this.centralDirOffset=this.reader.readInt(8),this.zip64ExtensibleData={};for(var e,t,r,n=this.zip64EndOfCentralSize-44,i=0;n>i;)e=this.reader.readInt(2),t=this.reader.readInt(4),r=this.reader.readData(t),this.zip64ExtensibleData[e]={id:e,length:t,value:r}},readBlockZip64EndOfCentralLocator:function(){if(this.diskWithZip64CentralDirStart=this.reader.readInt(4),this.relativeOffsetEndOfZip64CentralDir=this.reader.readInt(8),this.disksCount=this.reader.readInt(4),this.disksCount>1)throw new Error("Multi-volumes zip are not supported")},readLocalFiles:function(){var e,t;for(e=0;e<this.files.length;e++)t=this.files[e],this.reader.setIndex(t.localHeaderOffset),this.checkSignature(o.LOCAL_FILE_HEADER),t.readLocalPart(this.reader),t.handleUTF8(),t.processAttributes()},readCentralDir:function(){var e;for(this.reader.setIndex(this.centralDirOffset);this.reader.readAndCheckSignature(o.CENTRAL_FILE_HEADER);)e=new a({zip64:this.zip64},this.loadOptions),e.readCentralPart(this.reader),this.files.push(e);if(this.centralDirRecords!==this.files.length&&0!==this.centralDirRecords&&0===this.files.length)throw new Error("Corrupted zip or bug: expected "+this.centralDirRecords+" records in central dir, got "+this.files.length)},readEndOfCentral:function(){var e=this.reader.lastIndexOfSignature(o.CENTRAL_DIRECTORY_END);if(0>e){var t=!this.isSignature(0,o.LOCAL_FILE_HEADER);throw new Error(t?"Can't find end of central directory : is this a zip file ? If it is, see http://stuk.github.io/jszip/documentation/howto/read_zip.html":"Corrupted zip : can't find end of central directory")}this.reader.setIndex(e);var r=e;if(this.checkSignature(o.CENTRAL_DIRECTORY_END),this.readBlockEndOfCentral(),this.diskNumber===i.MAX_VALUE_16BITS||this.diskWithCentralDirStart===i.MAX_VALUE_16BITS||this.centralDirRecordsOnThisDisk===i.MAX_VALUE_16BITS||this.centralDirRecords===i.MAX_VALUE_16BITS||this.centralDirSize===i.MAX_VALUE_32BITS||this.centralDirOffset===i.MAX_VALUE_32BITS){if(this.zip64=!0,e=this.reader.lastIndexOfSignature(o.ZIP64_CENTRAL_DIRECTORY_LOCATOR),0>e)throw new Error("Corrupted zip : can't find the ZIP64 end of central directory locator");if(this.reader.setIndex(e),this.checkSignature(o.ZIP64_CENTRAL_DIRECTORY_LOCATOR),this.readBlockZip64EndOfCentralLocator(),!this.isSignature(this.relativeOffsetEndOfZip64CentralDir,o.ZIP64_CENTRAL_DIRECTORY_END)&&(this.relativeOffsetEndOfZip64CentralDir=this.reader.lastIndexOfSignature(o.ZIP64_CENTRAL_DIRECTORY_END),this.relativeOffsetEndOfZip64CentralDir<0))throw new Error("Corrupted zip : can't find the ZIP64 end of central directory");this.reader.setIndex(this.relativeOffsetEndOfZip64CentralDir),this.checkSignature(o.ZIP64_CENTRAL_DIRECTORY_END),this.readBlockZip64EndOfCentral()}var n=this.centralDirOffset+this.centralDirSize;this.zip64&&(n+=20,n+=12+this.zip64EndOfCentralSize);var a=r-n;if(a>0)this.isSignature(r,o.CENTRAL_FILE_HEADER)||(this.reader.zero=a);else if(0>a)throw new Error("Corrupted zip: missing "+Math.abs(a)+" bytes.")},prepareReader:function(e){this.reader=n(e)},load:function(e){this.prepareReader(e),this.readEndOfCentral(),this.readCentralDir(),this.readLocalFiles()}},t.exports=r},{"./reader/readerFor":144,"./signature":145,"./support":152,"./utf8":153,"./utils":154,"./zipEntry":156}],156:[function(e,t){"use strict";function r(e,t){this.options=e,this.loadOptions=t}var n=e("./reader/readerFor"),i=e("./utils"),o=e("./compressedObject"),a=e("./crc32"),s=e("./utf8"),u=e("./compressions"),l=e("./support"),c=0,f=3,h=function(e){for(var t in u)if(u.hasOwnProperty(t)&&u[t].magic===e)return u[t];return null};r.prototype={isEncrypted:function(){return 1===(1&this.bitFlag)},useUTF8:function(){return 2048===(2048&this.bitFlag)},readLocalPart:function(e){var t,r;if(e.skip(22),this.fileNameLength=e.readInt(2),r=e.readInt(2),this.fileName=e.readData(this.fileNameLength),e.skip(r),-1===this.compressedSize||-1===this.uncompressedSize)throw new Error("Bug or corrupted zip : didn't get enough informations from the central directory (compressedSize === -1 || uncompressedSize === -1)");if(t=h(this.compressionMethod),null===t)throw new Error("Corrupted zip : compression "+i.pretty(this.compressionMethod)+" unknown (inner file : "+i.transformTo("string",this.fileName)+")");this.decompressed=new o(this.compressedSize,this.uncompressedSize,this.crc32,t,e.readData(this.compressedSize))},readCentralPart:function(e){this.versionMadeBy=e.readInt(2),e.skip(2),this.bitFlag=e.readInt(2),this.compressionMethod=e.readString(2),this.date=e.readDate(),this.crc32=e.readInt(4),this.compressedSize=e.readInt(4),this.uncompressedSize=e.readInt(4);var t=e.readInt(2);if(this.extraFieldsLength=e.readInt(2),this.fileCommentLength=e.readInt(2),this.diskNumberStart=e.readInt(2),this.internalFileAttributes=e.readInt(2),this.externalFileAttributes=e.readInt(4),this.localHeaderOffset=e.readInt(4),this.isEncrypted())throw new Error("Encrypted zip are not supported");e.skip(t),this.readExtraFields(e),this.parseZIP64ExtraField(e),this.fileComment=e.readData(this.fileCommentLength)},processAttributes:function(){this.unixPermissions=null,this.dosPermissions=null;var e=this.versionMadeBy>>8;this.dir=16&this.externalFileAttributes?!0:!1,e===c&&(this.dosPermissions=63&this.externalFileAttributes),e===f&&(this.unixPermissions=this.externalFileAttributes>>16&65535),this.dir||"/"!==this.fileNameStr.slice(-1)||(this.dir=!0)},parseZIP64ExtraField:function(){if(this.extraFields[1]){var e=n(this.extraFields[1].value);this.uncompressedSize===i.MAX_VALUE_32BITS&&(this.uncompressedSize=e.readInt(8)),this.compressedSize===i.MAX_VALUE_32BITS&&(this.compressedSize=e.readInt(8)),this.localHeaderOffset===i.MAX_VALUE_32BITS&&(this.localHeaderOffset=e.readInt(8)),this.diskNumberStart===i.MAX_VALUE_32BITS&&(this.diskNumberStart=e.readInt(4))}},readExtraFields:function(e){var t,r,n,i=e.index+this.extraFieldsLength;for(this.extraFields||(this.extraFields={});e.index<i;)t=e.readInt(2),r=e.readInt(2),n=e.readData(r),this.extraFields[t]={id:t,length:r,value:n}},handleUTF8:function(){var e=l.uint8array?"uint8array":"array";if(this.useUTF8())this.fileNameStr=s.utf8decode(this.fileName),this.fileCommentStr=s.utf8decode(this.fileComment);else{var t=this.findExtraFieldUnicodePath();if(null!==t)this.fileNameStr=t;else{var r=i.transformTo(e,this.fileName);this.fileNameStr=this.loadOptions.decodeFileName(r)}var n=this.findExtraFieldUnicodeComment();if(null!==n)this.fileCommentStr=n;else{var o=i.transformTo(e,this.fileComment);this.fileCommentStr=this.loadOptions.decodeFileName(o)}}},findExtraFieldUnicodePath:function(){var e=this.extraFields[28789];if(e){var t=n(e.value);return 1!==t.readInt(1)?null:a(this.fileName)!==t.readInt(4)?null:s.utf8decode(t.readData(e.length-5))}return null},findExtraFieldUnicodeComment:function(){var e=this.extraFields[25461];if(e){var t=n(e.value);return 1!==t.readInt(1)?null:a(this.fileComment)!==t.readInt(4)?null:s.utf8decode(t.readData(e.length-5))}return null}},t.exports=r},{"./compressedObject":127,"./compressions":128,"./crc32":129,"./reader/readerFor":144,"./support":152,"./utf8":153,"./utils":154}],157:[function(e,t){"use strict";var r=e("./stream/StreamHelper"),n=e("./stream/DataWorker"),i=e("./utf8"),o=e("./compressedObject"),a=e("./stream/GenericWorker"),s=function(e,t,r){this.name=e,this.dir=r.dir,this.date=r.date,this.comment=r.comment,this.unixPermissions=r.unixPermissions,this.dosPermissions=r.dosPermissions,this._data=t,this._dataBinary=r.binary,this.options={compression:r.compression,compressionOptions:r.compressionOptions}};s.prototype={internalStream:function(e){var t=e.toLowerCase(),n="string"===t||"text"===t;("binarystring"===t||"text"===t)&&(t="string");var o=this._decompressWorker(),a=!this._dataBinary;return a&&!n&&(o=o.pipe(new i.Utf8EncodeWorker)),!a&&n&&(o=o.pipe(new i.Utf8DecodeWorker)),new r(o,t,"")},async:function(e,t){return this.internalStream(e).accumulate(t)},nodeStream:function(e,t){return this.internalStream(e||"nodebuffer").toNodejsStream(t)},_decompressWorker:function(){return this._data instanceof o?this._data.getContentWorker():this._data instanceof a?this._data:new n(this._data)}};for(var u=["asText","asBinary","asNodeBuffer","asUint8Array","asArrayBuffer"],l=function(){throw new Error("This method has been removed in JSZip 3.0, please check the upgrade guide.")},c=0;c<u.length;c++)s.prototype[u[c]]=l;t.exports=s},{"./compressedObject":127,"./stream/DataWorker":149,"./stream/GenericWorker":150,"./stream/StreamHelper":151,"./utf8":153}],158:[function(e,t){"use strict";function r(){if(s.length)throw s.shift()}function n(e){var t;t=a.length?a.pop():new i,t.task=e,o(t)}function i(){this.task=null}var o=e("./raw"),a=[],s=[],u=o.makeRequestCallFromTimer(r);t.exports=n,i.prototype.call=function(){try{this.task.call()}catch(e){n.onerror?n.onerror(e):(s.push(e),u())}finally{this.task=null,a[a.length]=this}}},{"./raw":159}],159:[function(e,t){(function(e){"use strict";function r(e){s.length||(a(),u=!0),s[s.length]=e}function n(){for(;l<s.length;){var e=l;if(l+=1,s[e].call(),l>c){for(var t=0,r=s.length-l;r>t;t++)s[t]=s[t+l];s.length-=l,l=0}}s.length=0,l=0,u=!1}function i(e){var t=1,r=new h(e),n=document.createTextNode("");return r.observe(n,{characterData:!0}),function(){t=-t,n.data=t}}function o(e){return function(){function t(){clearTimeout(r),clearInterval(n),e()}var r=setTimeout(t,0),n=setInterval(t,50)}}t.exports=r;var a,s=[],u=!1,l=0,c=1024,f="undefined"!=typeof e?e:self,h=f.MutationObserver||f.WebKitMutationObserver;a="function"==typeof h?i(n):o(n),r.requestFlush=a,r.makeRequestCallFromTimer=o}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{}],160:[function(e,t){"use strict";var r=e("./lib/utils/common").assign,n=e("./lib/deflate"),i=e("./lib/inflate"),o=e("./lib/zlib/constants"),a={};r(a,n,i,o),t.exports=a},{"./lib/deflate":161,"./lib/inflate":162,"./lib/utils/common":163,"./lib/zlib/constants":166}],161:[function(e,t,r){"use strict";function n(e){if(!(this instanceof n))return new n(e);this.options=u.assign({level:v,method:b,chunkSize:16384,windowBits:15,memLevel:8,strategy:y,to:""},e||{});var t=this.options;t.raw&&t.windowBits>0?t.windowBits=-t.windowBits:t.gzip&&t.windowBits>0&&t.windowBits<16&&(t.windowBits+=16),this.err=0,this.msg="",this.ended=!1,this.chunks=[],this.strm=new f,this.strm.avail_out=0;var r=s.deflateInit2(this.strm,t.level,t.method,t.windowBits,t.memLevel,t.strategy);if(r!==_)throw new Error(c[r]);if(t.header&&s.deflateSetHeader(this.strm,t.header),t.dictionary){var i;if(i="string"==typeof t.dictionary?l.string2buf(t.dictionary):"[object ArrayBuffer]"===h.call(t.dictionary)?new Uint8Array(t.dictionary):t.dictionary,r=s.deflateSetDictionary(this.strm,i),r!==_)throw new Error(c[r]);this._dict_set=!0}}function i(e,t){var r=new n(t);if(r.push(e,!0),r.err)throw r.msg||c[r.err];return r.result}function o(e,t){return t=t||{},t.raw=!0,i(e,t)}function a(e,t){return t=t||{},t.gzip=!0,i(e,t)}var s=e("./zlib/deflate"),u=e("./utils/common"),l=e("./utils/strings"),c=e("./zlib/messages"),f=e("./zlib/zstream"),h=Object.prototype.toString,d=0,p=4,_=0,m=1,g=2,v=-1,y=0,b=8;n.prototype.push=function(e,t){var r,n,i=this.strm,o=this.options.chunkSize;if(this.ended)return!1;n=t===~~t?t:t===!0?p:d,i.input="string"==typeof e?l.string2buf(e):"[object ArrayBuffer]"===h.call(e)?new Uint8Array(e):e,i.next_in=0,i.avail_in=i.input.length;do{if(0===i.avail_out&&(i.output=new u.Buf8(o),i.next_out=0,i.avail_out=o),r=s.deflate(i,n),r!==m&&r!==_)return this.onEnd(r),this.ended=!0,!1;(0===i.avail_out||0===i.avail_in&&(n===p||n===g))&&this.onData("string"===this.options.to?l.buf2binstring(u.shrinkBuf(i.output,i.next_out)):u.shrinkBuf(i.output,i.next_out))}while((i.avail_in>0||0===i.avail_out)&&r!==m);return n===p?(r=s.deflateEnd(this.strm),this.onEnd(r),this.ended=!0,r===_):n===g?(this.onEnd(_),i.avail_out=0,!0):!0},n.prototype.onData=function(e){this.chunks.push(e)},n.prototype.onEnd=function(e){e===_&&(this.result="string"===this.options.to?this.chunks.join(""):u.flattenChunks(this.chunks)),this.chunks=[],this.err=e,this.msg=this.strm.msg},r.Deflate=n,r.deflate=i,r.deflateRaw=o,r.gzip=a},{"./utils/common":163,"./utils/strings":164,"./zlib/deflate":168,"./zlib/messages":173,"./zlib/zstream":175}],162:[function(e,t,r){"use strict";function n(e){if(!(this instanceof n))return new n(e);this.options=s.assign({chunkSize:16384,windowBits:0,to:""},e||{});var t=this.options;t.raw&&t.windowBits>=0&&t.windowBits<16&&(t.windowBits=-t.windowBits,0===t.windowBits&&(t.windowBits=-15)),!(t.windowBits>=0&&t.windowBits<16)||e&&e.windowBits||(t.windowBits+=32),t.windowBits>15&&t.windowBits<48&&0===(15&t.windowBits)&&(t.windowBits|=15),this.err=0,this.msg="",this.ended=!1,this.chunks=[],this.strm=new f,this.strm.avail_out=0;var r=a.inflateInit2(this.strm,t.windowBits);if(r!==l.Z_OK)throw new Error(c[r]);this.header=new h,a.inflateGetHeader(this.strm,this.header)}function i(e,t){var r=new n(t);if(r.push(e,!0),r.err)throw r.msg||c[r.err];return r.result
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this.onEnd(r),this.ended=!0,!1;h.next_out&&(0===h.avail_out||r===l.Z_STREAM_END||0===h.avail_in&&(n===l.Z_FINISH||n===l.Z_SYNC_FLUSH))&&("string"===this.options.to?(i=u.utf8border(h.output,h.next_out),o=h.next_out-i,c=u.buf2string(h.output,i),h.next_out=o,h.avail_out=p-o,o&&s.arraySet(h.output,h.output,i,o,0),this.onData(c)):this.onData(s.shrinkBuf(h.output,h.next_out))),0===h.avail_in&&0===h.avail_out&&(m=!0)}while((h.avail_in>0||0===h.avail_out)&&r!==l.Z_STREAM_END);return r===l.Z_STREAM_END&&(n=l.Z_FINISH),n===l.Z_FINISH?(r=a.inflateEnd(this.strm),this.onEnd(r),this.ended=!0,r===l.Z_OK):n===l.Z_SYNC_FLUSH?(this.onEnd(l.Z_OK),h.avail_out=0,!0):!0},n.prototype.onData=function(e){this.chunks.push(e)},n.prototype.onEnd=function(e){e===l.Z_OK&&(this.result="string"===this.options.to?this.chunks.join(""):s.flattenChunks(this.chunks)),this.chunks=[],this.err=e,this.msg=this.strm.msg},r.Inflate=n,r.inflate=i,r.inflateRaw=o,r.ungzip=i},{"./utils/common":163,"./utils/strings":164,"./zlib/constants":166,"./zlib/gzheader":169,"./zlib/inflate":171,"./zlib/messages":173,"./zlib/zstream":175}],163:[function(e,t,r){"use strict";var n="undefined"!=typeof Uint8Array&&"undefined"!=typeof Uint16Array&&"undefined"!=typeof Int32Array;r.assign=function(e){for(var t=Array.prototype.slice.call(arguments,1);t.length;){var r=t.shift();if(r){if("object"!=typeof r)throw new TypeError(r+"must be non-object");for(var n in r)r.hasOwnProperty(n)&&(e[n]=r[n])}}return 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s.status=_t;if(s.status===_t)if(s.gzhead.name){c=s.pending;do{if(s.pending===s.pending_buf_size&&(s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),a(e),c=s.pending,s.pending===s.pending_buf_size)){f=1;break}f=s.gzindex<s.gzhead.name.length?255&s.gzhead.name.charCodeAt(s.gzindex++):0,u(s,f)}while(0!==f);s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),0===f&&(s.gzindex=0,s.status=mt)}else s.status=mt;if(s.status===mt)if(s.gzhead.comment){c=s.pending;do{if(s.pending===s.pending_buf_size&&(s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),a(e),c=s.pending,s.pending===s.pending_buf_size)){f=1;break}f=s.gzindex<s.gzhead.comment.length?255&s.gzhead.comment.charCodeAt(s.gzindex++):0,u(s,f)}while(0!==f);s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),0===f&&(s.status=gt)}else s.status=gt;if(s.status===gt&&(s.gzhead.hcrc?(s.pending+2>s.pending_buf_size&&a(e),s.pending+2<=s.pending_buf_size&&(u(s,255&e.adler),u(s,e.adler>>8&255),e.adler=0,s.status=vt)):s.status=vt),0!==s.pending){if(a(e),0===e.avail_out)return s.last_flush=-1,D}else if(0===e.avail_in&&i(t)<=i(r)&&t!==F)return n(e,q);if(s.status===yt&&0!==e.avail_in)return n(e,q);if(0!==e.avail_in||0!==s.lookahead||t!==j&&s.status!==yt){var p=s.strategy===H?g(s,t):s.strategy===X?m(s,t):M[s.level].func(s,t);if((p===wt||p===kt)&&(s.status=yt),p===bt||p===wt)return 0===e.avail_out&&(s.last_flush=-1),D;if(p===xt&&(t===I?P._tr_align(s):t!==U&&(P._tr_stored_block(s,0,0,!1),t===C&&(o(s.head),0===s.lookahead&&(s.strstart=0,s.block_start=0,s.insert=0))),a(e),0===e.avail_out))return s.last_flush=-1,D}return t!==F?D:s.wrap<=0?B:(2===s.wrap?(u(s,255&e.adler),u(s,e.adler>>8&255),u(s,e.adler>>16&255),u(s,e.adler>>24&255),u(s,255&e.total_in),u(s,e.total_in>>8&255),u(s,e.total_in>>16&255),u(s,e.total_in>>24&255)):(l(s,e.adler>>>16),l(s,65535&e.adler)),a(e),s.wrap>0&&(s.wrap=-s.wrap),0!==s.pending?D:B)}function S(e){var t;return e&&e.state?(t=e.state.status,t!==dt&&t!==pt&&t!==_t&&t!==mt&&t!==gt&&t!==vt&&t!==yt?n(e,G):(e.state=null,t===vt?n(e,V):D)):G}function R(e,t){var r,n,i,a,s,u,l,c,f=t.length;if(!e||!e.state)return G;if(r=e.state,a=r.wrap,2===a||1===a&&r.status!==dt||r.lookahead)return G;for(1===a&&(e.adler=z(e.adler,t,f,0)),r.wrap=0,f>=r.w_size&&(0===a&&(o(r.head),r.strstart=0,r.block_start=0,r.insert=0),c=new O.Buf8(r.w_size),O.arraySet(c,t,f-r.w_size,r.w_size,0),t=c,f=r.w_size),s=e.avail_in,u=e.next_in,l=e.input,e.avail_in=f,e.next_in=0,e.input=t,h(r);r.lookahead>=lt;){n=r.strstart,i=r.lookahead-(lt-1);do 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v(32,258,258,4096,_)],r.deflateInit=T,r.deflateInit2=A,r.deflateReset=w,r.deflateResetKeep=x,r.deflateSetHeader=k,r.deflate=E,r.deflateEnd=S,r.deflateSetDictionary=R,r.deflateInfo="pako deflate (from Nodeca project)"},{"../utils/common":163,"./adler32":165,"./crc32":167,"./messages":173,"./trees":174}],169:[function(e,t){"use strict";function r(){this.text=0,this.time=0,this.xflags=0,this.os=0,this.extra=null,this.extra_len=0,this.name="",this.comment="",this.hcrc=0,this.done=!1}t.exports=r},{}],170:[function(e,t){"use strict";var r=30,n=12;t.exports=function(e,t){var i,o,a,s,u,l,c,f,h,d,p,_,m,g,v,y,b,x,w,k,A,T,E,S,R;i=e.state,o=e.next_in,S=e.input,a=o+(e.avail_in-5),s=e.next_out,R=e.output,u=s-(t-e.avail_out),l=s+(e.avail_out-257),c=i.dmax,f=i.wsize,h=i.whave,d=i.wnext,p=i.window,_=i.hold,m=i.bits,g=i.lencode,v=i.distcode,y=(1<<i.lenbits)-1,b=(1<<i.distbits)-1;e:do{15>m&&(_+=S[o++]<<m,m+=8,_+=S[o++]<<m,m+=8),x=g[_&y];t:for(;;){if(w=x>>>24,_>>>=w,m-=w,w=x>>>16&255,0===w)R[s++]=65535&x;else{if(!(16&w)){if(0===(64&w)){x=g[(65535&x)+(_&(1<<w)-1)];continue t}if(32&w){i.mode=n;break e}e.msg="invalid literal/length code",i.mode=r;break e}k=65535&x,w&=15,w&&(w>m&&(_+=S[o++]<<m,m+=8),k+=_&(1<<w)-1,_>>>=w,m-=w),15>m&&(_+=S[o++]<<m,m+=8,_+=S[o++]<<m,m+=8),x=v[_&b];r:for(;;){if(w=x>>>24,_>>>=w,m-=w,w=x>>>16&255,!(16&w)){if(0===(64&w)){x=v[(65535&x)+(_&(1<<w)-1)];continue r}e.msg="invalid distance code",i.mode=r;break e}if(A=65535&x,w&=15,w>m&&(_+=S[o++]<<m,m+=8,w>m&&(_+=S[o++]<<m,m+=8)),A+=_&(1<<w)-1,A>c){e.msg="invalid distance too far back",i.mode=r;break 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B:if(1024&r.flags){for(;16>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.length=h,r.head&&(r.head.extra_len=h),512&r.flags&&(St[0]=255&h,St[1]=h>>>8&255,r.check=b(r.check,St,2,0)),h=0,d=0}else r.head&&(r.head.extra=null);r.mode=G;case G:if(1024&r.flags&&(m=r.length,m>u&&(m=u),m&&(r.head&&(wt=r.head.extra_len-r.length,r.head.extra||(r.head.extra=new Array(r.head.extra_len)),v.arraySet(r.head.extra,i,a,m,wt)),512&r.flags&&(r.check=b(r.check,i,m,a)),u-=m,a+=m,r.length-=m),r.length))break e;r.length=0,r.mode=V;case V:if(2048&r.flags){if(0===u)break e;m=0;do wt=i[a+m++],r.head&&wt&&r.length<65536&&(r.head.name+=String.fromCharCode(wt));while(wt&&u>m);if(512&r.flags&&(r.check=b(r.check,i,m,a)),u-=m,a+=m,wt)break e}else r.head&&(r.head.name=null);r.length=0,r.mode=q;case q:if(4096&r.flags){if(0===u)break e;m=0;do wt=i[a+m++],r.head&&wt&&r.length<65536&&(r.head.comment+=String.fromCharCode(wt));while(wt&&u>m);if(512&r.flags&&(r.check=b(r.check,i,m,a)),u-=m,a+=m,wt)break e}else r.head&&(r.head.comment=null);r.mode=W;case W:if(512&r.flags){for(;16>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(h!==(65535&r.check)){e.msg="header crc mismatch",r.mode=ht;break}h=0,d=0}r.head&&(r.head.hcrc=r.flags>>9&1,r.head.done=!0),e.adler=r.check=0,r.mode=X;break;case Z:for(;32>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}e.adler=r.check=n(h),h=0,d=0,r.mode=H;case H:if(0===r.havedict)return e.next_out=s,e.avail_out=l,e.next_in=a,e.avail_in=u,r.hold=h,r.bits=d,P;e.adler=r.check=1,r.mode=X;case X:if(t===S||t===R)break e;case Y:if(r.last){h>>>=7&d,d-=7&d,r.mode=lt;break}for(;3>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}switch(r.last=1&h,h>>>=1,d-=1,3&h){case 0:r.mode=J;break;case 1:if(c(r),r.mode=rt,t===R){h>>>=2,d-=2;break e}break;case 2:r.mode=Q;break;case 3:e.msg="invalid block type",r.mode=ht}h>>>=2,d-=2;break;case J:for(h>>>=7&d,d-=7&d;32>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if((65535&h)!==(h>>>16^65535)){e.msg="invalid stored block lengths",r.mode=ht;break}if(r.length=65535&h,h=0,d=0,r.mode=K,t===R)break e;case K:r.mode=$;case $:if(m=r.length){if(m>u&&(m=u),m>l&&(m=l),0===m)break e;v.arraySet(o,i,a,m,s),u-=m,a+=m,l-=m,s+=m,r.length-=m;break}r.mode=X;break;case Q:for(;14>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(r.nlen=(31&h)+257,h>>>=5,d-=5,r.ndist=(31&h)+1,h>>>=5,d-=5,r.ncode=(15&h)+4,h>>>=4,d-=4,r.nlen>286||r.ndist>30){e.msg="too many length or distance symbols",r.mode=ht;break}r.have=0,r.mode=et;case et:for(;r.have<r.ncode;){for(;3>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.lens[Rt[r.have++]]=7&h,h>>>=3,d-=3}for(;r.have<19;)r.lens[Rt[r.have++]]=0;if(r.lencode=r.lendyn,r.lenbits=7,At={bits:r.lenbits},kt=w(k,r.lens,0,19,r.lencode,0,r.work,At),r.lenbits=At.bits,kt){e.msg="invalid code lengths set",r.mode=ht;break}r.have=0,r.mode=tt;case tt:for(;r.have<r.nlen+r.ndist;){for(;Et=r.lencode[h&(1<<r.lenbits)-1],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(16>vt)h>>>=mt,d-=mt,r.lens[r.have++]=vt;else{if(16===vt){for(Tt=mt+2;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(h>>>=mt,d-=mt,0===r.have){e.msg="invalid bit length repeat",r.mode=ht;break}wt=r.lens[r.have-1],m=3+(3&h),h>>>=2,d-=2}else if(17===vt){for(Tt=mt+3;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=mt,d-=mt,wt=0,m=3+(7&h),h>>>=3,d-=3}else{for(Tt=mt+7;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=mt,d-=mt,wt=0,m=11+(127&h),h>>>=7,d-=7}if(r.have+m>r.nlen+r.ndist){e.msg="invalid bit length repeat",r.mode=ht;break}for(;m--;)r.lens[r.have++]=wt}}if(r.mode===ht)break;if(0===r.lens[256]){e.msg="invalid code -- missing end-of-block",r.mode=ht;break}if(r.lenbits=9,At={bits:r.lenbits},kt=w(A,r.lens,0,r.nlen,r.lencode,0,r.work,At),r.lenbits=At.bits,kt){e.msg="invalid literal/lengths set",r.mode=ht;break}if(r.distbits=6,r.distcode=r.distdyn,At={bits:r.distbits},kt=w(T,r.lens,r.nlen,r.ndist,r.distcode,0,r.work,At),r.distbits=At.bits,kt){e.msg="invalid distances set",r.mode=ht;break}if(r.mode=rt,t===R)break e;case rt:r.mode=nt;case nt:if(u>=6&&l>=258){e.next_out=s,e.avail_out=l,e.next_in=a,e.avail_in=u,r.hold=h,r.bits=d,x(e,_),s=e.next_out,o=e.output,l=e.avail_out,a=e.next_in,i=e.input,u=e.avail_in,h=r.hold,d=r.bits,r.mode===X&&(r.back=-1);break}for(r.back=0;Et=r.lencode[h&(1<<r.lenbits)-1],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(gt&&0===(240&gt)){for(yt=mt,bt=gt,xt=vt;Et=r.lencode[xt+((h&(1<<yt+bt)-1)>>yt)],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=yt+mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=yt,d-=yt,r.back+=yt}if(h>>>=mt,d-=mt,r.back+=mt,r.length=vt,0===gt){r.mode=ut;break}if(32&gt){r.back=-1,r.mode=X;break}if(64&gt){e.msg="invalid literal/length code",r.mode=ht;break}r.extra=15&gt,r.mode=it;case it:if(r.extra){for(Tt=r.extra;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.length+=h&(1<<r.extra)-1,h>>>=r.extra,d-=r.extra,r.back+=r.extra}r.was=r.length,r.mode=ot;case ot:for(;Et=r.distcode[h&(1<<r.distbits)-1],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(0===(240&gt)){for(yt=mt,bt=gt,xt=vt;Et=r.distcode[xt+((h&(1<<yt+bt)-1)>>yt)],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=yt+mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=yt,d-=yt,r.back+=yt}if(h>>>=mt,d-=mt,r.back+=mt,64&gt){e.msg="invalid distance code",r.mode=ht;break}r.offset=vt,r.extra=15&gt,r.mode=at;case at:if(r.extra){for(Tt=r.extra;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.offset+=h&(1<<r.extra)-1,h>>>=r.extra,d-=r.extra,r.back+=r.extra}if(r.offset>r.dmax){e.msg="invalid distance too far back",r.mode=ht;break}r.mode=st;case st:if(0===l)break e;if(m=_-l,r.offset>m){if(m=r.offset-m,m>r.whave&&r.sane){e.msg="invalid distance too far back",r.mode=ht;break}m>r.wnext?(m-=r.wnext,g=r.wsize-m):g=r.wnext-m,m>r.length&&(m=r.length),_t=r.window}else _t=o,g=s-r.offset,m=r.length;m>l&&(m=l),l-=m,r.length-=m;do o[s++]=_t[g++];while(--m);0===r.length&&(r.mode=nt);break;case ut:if(0===l)break e;o[s++]=r.length,l--,r.mode=nt;break;case lt:if(r.wrap){for(;32>d;){if(0===u)break e;
-u--,h|=i[a++]<<d,d+=8}if(_-=l,e.total_out+=_,r.total+=_,_&&(e.adler=r.check=r.flags?b(r.check,o,_,s-_):y(r.check,o,_,s-_)),_=l,(r.flags?h:n(h))!==r.check){e.msg="incorrect data check",r.mode=ht;break}h=0,d=0}r.mode=ct;case ct:if(r.wrap&&r.flags){for(;32>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(h!==(4294967295&r.total)){e.msg="incorrect length check",r.mode=ht;break}h=0,d=0}r.mode=ft;case ft:kt=O;break e;case ht:kt=L;break e;case dt:return N;case pt:default:return z}return e.next_out=s,e.avail_out=l,e.next_in=a,e.avail_in=u,r.hold=h,r.bits=d,(r.wsize||_!==e.avail_out&&r.mode<ht&&(r.mode<lt||t!==E))&&f(e,e.output,e.next_out,_-e.avail_out)?(r.mode=dt,N):(p-=e.avail_in,_-=e.avail_out,e.total_in+=p,e.total_out+=_,r.total+=_,r.wrap&&_&&(e.adler=r.check=r.flags?b(r.check,o,_,e.next_out-_):y(r.check,o,_,e.next_out-_)),e.data_type=r.bits+(r.last?64:0)+(r.mode===X?128:0)+(r.mode===rt||r.mode===K?256:0),(0===p&&0===_||t===E)&&kt===M&&(kt=j),kt)}function d(e){if(!e||!e.state)return z;var t=e.state;return t.window&&(t.window=null),e.state=null,M}function p(e,t){var r;return e&&e.state?(r=e.state,0===(2&r.wrap)?z:(r.head=t,t.done=!1,M)):z}function _(e,t){var r,n,i,o=t.length;return e&&e.state?(r=e.state,0!==r.wrap&&r.mode!==H?z:r.mode===H&&(n=1,n=y(n,t,o,0),n!==r.check)?L:(i=f(e,t,o,o))?(r.mode=dt,N):(r.havedict=1,M)):z}var m,g,v=e("../utils/common"),y=e("./adler32"),b=e("./crc32"),x=e("./inffast"),w=e("./inftrees"),k=0,A=1,T=2,E=4,S=5,R=6,M=0,O=1,P=2,z=-2,L=-3,N=-4,j=-5,I=8,C=1,F=2,U=3,D=4,B=5,G=6,V=7,q=8,W=9,Z=10,H=11,X=12,Y=13,J=14,K=15,$=16,Q=17,et=18,tt=19,rt=20,nt=21,it=22,ot=23,at=24,st=25,ut=26,lt=27,ct=28,ft=29,ht=30,dt=31,pt=32,_t=852,mt=592,gt=15,vt=gt,yt=!0;r.inflateReset=a,r.inflateReset2=s,r.inflateResetKeep=o,r.inflateInit=l,r.inflateInit2=u,r.inflate=h,r.inflateEnd=d,r.inflateGetHeader=p,r.inflateSetDictionary=_,r.inflateInfo="pako inflate (from Nodeca project)"},{"../utils/common":163,"./adler32":165,"./crc32":167,"./inffast":170,"./inftrees":172}],172:[function(e,t){"use strict";var r=e("../utils/common"),n=15,i=852,o=592,a=0,s=1,u=2,l=[3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0],c=[16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,72,78],f=[1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0],h=[16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64];t.exports=function(e,t,d,p,_,m,g,v){var y,b,x,w,k,A,T,E,S,R=v.bits,M=0,O=0,P=0,z=0,L=0,N=0,j=0,I=0,C=0,F=0,U=null,D=0,B=new r.Buf16(n+1),G=new r.Buf16(n+1),V=null,q=0;for(M=0;n>=M;M++)B[M]=0;for(O=0;p>O;O++)B[t[d+O]]++;for(L=R,z=n;z>=1&&0===B[z];z--);if(L>z&&(L=z),0===z)return _[m++]=20971520,_[m++]=20971520,v.bits=1,0;for(P=1;z>P&&0===B[P];P++);for(P>L&&(L=P),I=1,M=1;n>=M;M++)if(I<<=1,I-=B[M],0>I)return-1;if(I>0&&(e===a||1!==z))return-1;for(G[1]=0,M=1;n>M;M++)G[M+1]=G[M]+B[M];for(O=0;p>O;O++)0!==t[d+O]&&(g[G[t[d+O]]++]=O);if(e===a?(U=V=g,A=19):e===s?(U=l,D-=257,V=c,q-=257,A=256):(U=f,V=h,A=-1),F=0,O=0,M=P,k=m,N=L,j=0,x=-1,C=1<<L,w=C-1,e===s&&C>i||e===u&&C>o)return 1;for(;;){T=M-j,g[O]<A?(E=0,S=g[O]):g[O]>A?(E=V[q+g[O]],S=U[D+g[O]]):(E=96,S=0),y=1<<M-j,b=1<<N,P=b;do b-=y,_[k+(F>>j)+b]=T<<24|E<<16|S|0;while(0!==b);for(y=1<<M-1;F&y;)y>>=1;if(0!==y?(F&=y-1,F+=y):F=0,O++,0===--B[M]){if(M===z)break;M=t[d+g[O]]}if(M>L&&(F&w)!==x){for(0===j&&(j=L),k+=P,N=M-j,I=1<<N;z>N+j&&(I-=B[N+j],!(0>=I));)N++,I<<=1;if(C+=1<<N,e===s&&C>i||e===u&&C>o)return 1;x=F&w,_[x]=L<<24|N<<16|k-m|0}}return 0!==F&&(_[k+F]=M-j<<24|64<<16|0),v.bits=L,0}},{"../utils/common":163}],173:[function(e,t){"use strict";t.exports={2:"need dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"}},{}],174:[function(e,t,r){"use strict";function n(e){for(var t=e.length;--t>=0;)e[t]=0}function i(e,t,r,n,i){this.static_tree=e,this.extra_bits=t,this.extra_base=r,this.elems=n,this.max_length=i,this.has_stree=e&&e.length}function o(e,t){this.dyn_tree=e,this.max_code=0,this.stat_desc=t}function a(e){return 256>e?ut[e]:ut[256+(e>>>7)]}function s(e,t){e.pending_buf[e.pending++]=255&t,e.pending_buf[e.pending++]=t>>>8&255}function u(e,t,r){e.bi_valid>Y-r?(e.bi_buf|=t<<e.bi_valid&65535,s(e,e.bi_buf),e.bi_buf=t>>Y-e.bi_valid,e.bi_valid+=r-Y):(e.bi_buf|=t<<e.bi_valid&65535,e.bi_valid+=r)}function l(e,t,r){u(e,r[2*t],r[2*t+1])}function c(e,t){var r=0;do r|=1&e,e>>>=1,r<<=1;while(--t>0);return r>>>1}function f(e){16===e.bi_valid?(s(e,e.bi_buf),e.bi_buf=0,e.bi_valid=0):e.bi_valid>=8&&(e.pending_buf[e.pending++]=255&e.bi_buf,e.bi_buf>>=8,e.bi_valid-=8)}function h(e,t){var r,n,i,o,a,s,u=t.dyn_tree,l=t.max_code,c=t.stat_desc.static_tree,f=t.stat_desc.has_stree,h=t.stat_desc.extra_bits,d=t.stat_desc.extra_base,p=t.stat_desc.max_length,_=0;for(o=0;X>=o;o++)e.bl_count[o]=0;for(u[2*e.heap[e.heap_max]+1]=0,r=e.heap_max+1;H>r;r++)n=e.heap[r],o=u[2*u[2*n+1]+1]+1,o>p&&(o=p,_++),u[2*n+1]=o,n>l||(e.bl_count[o]++,a=0,n>=d&&(a=h[n-d]),s=u[2*n],e.opt_len+=s*(o+a),f&&(e.static_len+=s*(c[2*n+1]+a)));if(0!==_){do{for(o=p-1;0===e.bl_count[o];)o--;e.bl_count[o]--,e.bl_count[o+1]+=2,e.bl_count[p]--,_-=2}while(_>0);for(o=p;0!==o;o--)for(n=e.bl_count[o];0!==n;)i=e.heap[--r],i>l||(u[2*i+1]!==o&&(e.opt_len+=(o-u[2*i+1])*u[2*i],u[2*i+1]=o),n--)}}function d(e,t,r){var n,i,o=new Array(X+1),a=0;for(n=1;X>=n;n++)o[n]=a=a+r[n-1]<<1;for(i=0;t>=i;i++){var s=e[2*i+1];0!==s&&(e[2*i]=c(o[s]++,s))}}function p(){var e,t,r,n,o,a=new 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e=this.view.size.css.height*this.view.meters_per_pixel,t=this.constrainCamera({view_height:e,focal_length:c.default.interpolate(this.view.zoom,this.focal_length),fov:c.default.interpolate(this.view.zoom,this.fov)}),r=t.height,n=t.fov,i=[this.view.center.meters.x,this.view.center.meters.y,r];this.position_meters=i,d.mat4.lookAt(this.view_matrix,d.vec3.fromValues(i[0],i[1],0),d.vec3.fromValues(i[0],i[1],-1),d.vec3.fromValues(0,1,0)),d.mat4.perspective(this.projection_matrix,n,this.view.aspect,1,2*r),this.vanishing_point_skew[0]=this.vanishing_point[0]/this.view.size.css.width,this.vanishing_point_skew[1]=this.vanishing_point[1]/this.view.size.css.height,this.projection_matrix[8]=2*-this.vanishing_point_skew[0],this.projection_matrix[9]=2*-this.vanishing_point_skew[1],d.mat4.translate(this.projection_matrix,this.projection_matrix,d.vec3.fromValues(e/2*this.view.aspect*2*-this.vanishing_point_skew[0],e/2*2*-this.vanishing_point_skew[1],0)),d.mat4.translate(this.projection_matrix,this.projection_matrix,d.vec3.fromValues(0,0,-r))}},{key:"update",value:function(){s(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"update",this).call(this),this.updateMatrices()}},{key:"setupProgram",value:function(e){e.uniform("Matrix4fv","u_projection",this.projection_matrix),e.uniform("3f","u_eye",[0,0,this.position_meters[2]]),e.uniform("2fv","u_vanishing_point",this.vanishing_point_skew)}}]),t}(p),m=function(e){function t(e,r){var n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};a(this,t);var o=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r,n));return o.type="isometric",o.axis=n.axis||{x:0,y:1},2===o.axis.length&&(o.axis={x:o.axis[0],y:o.axis[1]}),o.position_meters=null,o.viewport_height=null,o.view_matrix=new Float64Array(16),o.projection_matrix=new Float32Array(16),h.default.replaceBlock("camera","\n            uniform mat4 u_projection;\n            uniform vec3 u_eye;\n            uniform vec2 u_vanishing_point;\n\n            void cameraProjection (inout vec4 position) {\n                position = u_projection * position;\n                // position.xy += position.z * u_isometric_axis;\n\n                // Reverse z for depth buffer so up is negative,\n                // and scale down values so objects higher than one screen height will not get clipped\n                // pull forward slightly to avoid going past far clipping plane\n                position.z = -position.z / 100. + 1. - 0.001;\n            }"),o}return o(t,e),u(t,[{key:"update",value:function(){s(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"update",this).call(this),this.viewport_height=this.view.size.css.height*this.view.meters_per_pixel;var e=[this.view.center.meters.x,this.view.center.meters.y,this.viewport_height];this.position_meters=e,d.mat4.identity(this.view_matrix),d.mat4.translate(this.view_matrix,this.view_matrix,d.vec3.fromValues(-e[0],-e[1],0)),d.mat4.identity(this.projection_matrix),this.projection_matrix[8]=this.axis.x/this.view.aspect,this.projection_matrix[9]=this.axis.y,d.mat4.scale(this.projection_matrix,this.projection_matrix,d.vec3.fromValues(2/this.view.size.meters.x,2/this.view.size.meters.y,2/this.view.size.meters.y))}},{key:"setupProgram",value:function(e){e.uniform("Matrix4fv","u_projection",this.projection_matrix),e.uniform("3fv","u_eye",[0,0,this.viewport_height]),e.uniform("2fv","u_vanishing_point",[0,0])}}]),t}(p),g=function(e){function t(e,r){var n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};a(this,t);var o=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r,n));return o.type="flat",o}return 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r=i(e,2),o=r[0],a=r[1];return{x:Math.floor((o+n.half_circumference_meters)/(n.circumference_meters/Math.pow(2,t))),y:Math.floor((-a+n.half_circumference_meters)/(n.circumference_meters/Math.pow(2,t))),z:t}},n.wrapTile=function(e){var t=e.x,r=e.y,n=e.z,i=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{x:!0,y:!1},o=(1<<n)-1;return i.x&&(t&=o),i.y&&(r&=o),{x:t,y:r,z:n}},n.metersToLatLng=function(e){var t=i(e,2),r=t[0],o=t[1];return r/=n.half_circumference_meters,o/=n.half_circumference_meters,o=(2*Math.atan(Math.exp(o*Math.PI))-Math.PI/2)/Math.PI,r*=180,o*=180,[r,o]},n.latLngToMeters=function(e){var t=i(e,2),r=t[0],o=t[1];return o=Math.log(Math.tan(o*Math.PI/360+Math.PI/4))/Math.PI,o*=n.half_circumference_meters,r*=n.half_circumference_meters/180,[r,o]},n.wrapLng=function(e){return(e>180||-180>e)&&(e=((e+180)%360+360)%360-180),e},n.transformGeometry=function(e,t){null!=e&&("Point"===e.type?t(e.coordinates):"LineString"===e.type||"MultiPoint"===e.type?e.coordinates.forEach(t):"Polygon"===e.type||"MultiLineString"===e.type?e.coordinates.forEach(function(e){return e.forEach(t)}):"MultiPolygon"===e.type&&e.coordinates.forEach(function(e){e.forEach(function(e){return e.forEach(t)})}))},n.boxIntersect=function(e,t){return!(t.sw.x>e.ne.x||t.ne.x<e.sw.x||t.sw.y>e.ne.y||t.ne.y<e.sw.y)},n.findBoundingBox=function(e){for(var t=1/0,r=-1/0,n=1/0,i=-1/0,o=e[0].length,a=0;o>a;a++){var s=e[0][a];s[0]<t&&(t=s[0]),s[1]<n&&(n=s[1]),s[0]>r&&(r=s[0]),s[1]>i&&(i=s[1])}return[t,n,r,i]},n.geometryType=function(e){return"Polygon"===e||"MultiPolygon"===e?"polygon":"LineString"===e||"MultiLineString"===e?"line":"Point"===e||"MultiPoint"===e?"point":void 0},n.centroid=function(e){if(e&&0!==e.length){for(var t=0,r=0,n=0,i=e[0],o=i.length,a=0,s=o-1;o>a;s=a,a++){var u=i[a],l=i[s],c=u[1]*l[0]-l[1]*u[0];t+=(u[0]+l[0])*c,r+=(u[1]+l[1])*c,n+=3*c}return[t/n,r/n]}},n.multiCentroid=function(e){for(var t=e.length,r=[0,0],i=0;i<e.length;i++){var o=n.centroid(e[i]);r[0]+=o[0],r[1]+=o[1]}return r[0]/=t,r[1]/=t,r},n.signedPolygonRingAreaSum=function(e){for(var t=0,r=e.length,n=0;r-1>n;n++){var i=e[n],o=e[n+1];t+=i[0]*o[1]-o[0]*i[1]}return t+=e[r-1][0]*e[0][1]-e[0][0]*e[r-1][1]},n.polygonRingArea=function(e){return Math.abs(n.signedPolygonRingAreaSum(e))/2},n.polygonArea=function(e){return e?n.polygonRingArea(e[0]):void 0},n.multiPolygonArea=function(e){for(var t=0,r=0;r<e.length;r++)t+=n.polygonArea(e[r]);return t},n.ringWinding=function(e){var t=n.signedPolygonRingAreaSum(e);return t>0?"CW":0>t?"CCW":void 0}},{}],204:[function(e,t,r){"use strict";Object.defineProperty(r,"__esModule",{value:!0});var n;r.default=n={},n.BYTE=5120,n.UNSIGNED_BYTE=5121,n.SHORT=5122,n.UNSIGNED_SHORT=5123,n.INT=5124,n.UNSIGNED_INT=5125,n.FLOAT=5126},{}],205:[function(e,t,r){"use strict";Object.defineProperty(r,"__esModule",{value:!0});var n;r.default=n={};var i=0;n.getContext=function(e,t){var r=!1;null==e&&(e=document.createElement("canvas"),e.style.position="absolute",e.style.top=0,e.style.left=0,e.style.zIndex=-1,document.body.appendChild(e),r=!0);var o=e.getContext("webgl",t)||e.getContext("experimental-webgl",t);if(!o)throw new Error("Couldn't create WebGL context.");return 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error:",d)}this.computed_vertex_source=null,this.computed_fragment_source=null,this.use(),this.refreshUniforms(),this.refreshAttributes()}},{key:"buildDefineList",value:function(){var t,r={};for(t in e.defines)r[t]=e.defines[t];for(t in this.defines)r[t]=this.defines[t];return r}},{key:"buildShaderBlockList",value:function(){var t=void 0,r={};for(t in e.blocks)if(r[t]=[],Array.isArray(e.blocks[t])){var n;(n=r[t]).push.apply(n,i(e.blocks[t].map(function(e,r){return{key:t,source:e,num:r,scope:"ShaderProgram"}})))}else r[t]=[{key:t,source:e.blocks[t],num:0,scope:"ShaderProgram"}];for(t in this.blocks)if(r[t]=r[t]||[],Array.isArray(this.blocks[t]))for(var o=this.block_scopes&&this.block_scopes[t]||[],a=null,s=0,u=0;u<this.blocks[t].length;u++)o[u]!==a&&(a=o[u],s=0),r[t].push({key:t,source:this.blocks[t][u],num:s,scope:a||this.name}),s++;else r[t].push({key:t,source:this.blocks[t],num:0,scope:this.name});return r}},{key:"ensureUniforms",value:function(e){if(e){var t,r=v.default(this.computed_vertex_source),n=v.default(this.computed_fragment_source),i=[],o=[];for(var a in e){var s=c.default.isUniformDefined(a,r),l=c.default.isUniformDefined(a,n);if(!s||!l){if(t=c.default.defineUniform(a,e[a]),!t)continue;s||(u.default("trace","Program "+this.name+": "+a+" not defined in vertex shader, injecting: '"+t+"'"),i.push(t)),l||(u.default("trace","Program "+this.name+": "+a+" not defined in fragment shader, injecting: '"+t+"'"),o.push(t))}}i.length>0&&(this.computed_vertex_source=i.join("\n")+this.computed_vertex_source),o.length>0&&(this.computed_fragment_source=o.join("\n")+this.computed_fragment_source)}}},{key:"setUniforms",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:!0;if(this.compiled){t&&(this.texture_unit=0);for(var r=c.default.parseUniforms(e),n=0;n<r.length;n++){var 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t=this.uniforms[e];t.location=this.gl.getUniformLocation(this.program,e),this.updateUniform(t)}}},{key:"refreshAttributes",value:function(){this.attribs={}}},{key:"attribute",value:function(e){if(this.compiled){var t=this.attribs[e]=this.attribs[e]||{};return null!=t.location?t:(t.name=e,t.location=this.gl.getAttribLocation(this.program,e),t)}}},{key:"source",value:function(e){return"vertex"===e?this.computed_vertex_source:"fragment"===e?this.computed_fragment_source:void 0}},{key:"lines",value:function(e){var t=this.source(e);return t?t.split("\n"):[]}},{key:"line",value:function(e,t){var r=this.lines(e);return r?r[t]:void 0}},{key:"block",value:function r(e,t){for(var n=this.lines(e),r=void 0,i=0;t>i&&i<n.length;i++){var o=n[i],a=o.match(/\/\/ tangram-block-start: ([A-Za-z0-9_-]+), ([A-Za-z0-9_-]+), (\d+)/);a&&a.length>1?r={scope:a[1],name:a[2],num:a[3]}:(a=o.match(/\/\/ tangram-block-end: ([A-Za-z0-9_-]+), ([A-Za-z0-9_-]+), 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r=arguments.length,n=Array(r>1?r-1:0),i=1;r>i;i++)n[i-1]=arguments[i];(t=k.blocks[e]).push.apply(t,n)},k.removeBlock=function(e){k.blocks[e]=[]},k.replaceBlock=function(e){k.removeBlock(e);for(var t=arguments.length,r=Array(t>1?t-1:0),n=1;t>n;n++)r[n-1]=arguments[n];k.addBlock.apply(k,[e].concat(r))},k.updateProgram=function(e,t,r,n){var i=m.default(e._tangram_id+"::"+r+"::"+n);if(k.programs_by_source[i])return u.default("trace","Reusing identical source GL program object"),k.programs_by_source[i];try{var o=k.createShader(e,r,e.VERTEX_SHADER),a=k.createShader(e,n,e.FRAGMENT_SHADER)}catch(s){throw u.default("error",s.message),s}if(e.useProgram(null),null!=t)for(var l=e.getAttachedShaders(t),c=0;c<l.length;c++)e.detachShader(t,l[c]);else t=e.createProgram();if(null==o||null==a)return t;if(e.attachShader(t,o),e.attachShader(t,a),e.linkProgram(t),!e.getProgramParameter(t,e.LINK_STATUS)){var f=new Error("WebGL program error:\n            VALIDATE_STATUS: 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this.valid?(this.url=t,this.source=this.url,this.source_type="url",this.loading=new Promise(function(t){var i=new Image;i.onload=function(){try{r.setElement(i,n)}catch(o){r.loaded=!1,s.default("warn","Texture '"+r.name+"': failed to load url: '"+r.source+"'",o,n),e.trigger("warning",{message:"Failed to load texture from "+r.source,error:o,texture:n})}r.loaded=!0,t(r)},i.onerror=function(i){r.loaded=!1,s.default("warn","Texture '"+r.name+"': failed to load url: '"+r.source+"'",i,n),e.trigger("warning",{message:"Failed to load texture from "+r.source,error:i,texture:n}),t(r)},l.default.isSafari()&&"data:"===r.source.slice(0,5)||(i.crossOrigin="anonymous"),i.src=r.source}),this.loading):void 0}},{key:"setData",value:function(e,t,r){var n=arguments.length>3&&void 0!==arguments[3]?arguments[3]:{};return this.width=e,this.height=t,this.source=r,this.source_type="data",Array.isArray(this.source)&&(this.source=new Uint8Array(this.source)),this.update(n),this.setFiltering(n),this.loaded=!0,this.loading=Promise.resolve(this),this.loading}},{key:"setElement",value:function(t,r){var n=t;if("string"==typeof t&&(t=document.querySelector(t)),t instanceof HTMLCanvasElement||t instanceof HTMLImageElement||t instanceof HTMLVideoElement)this.source=t,this.source_type="element",this.update(r),this.setFiltering(r);else{this.loaded=!1;var i="the 'element' parameter (`element: "+JSON.stringify(n)+"`) must be a CSS ";i+="selector string, or a <canvas>, <image> or <video> object",s.default("warn","Texture '"+this.name+"': "+i,r),e.trigger("warning",{message:"Failed to load texture because "+i,texture:r})
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0!==arguments[0]?arguments[0]:{};if(this.valid){t.filtering=t.filtering||"linear";var r=this.gl;this.bind(),l.default.isPowerOf2(this.width)&&l.default.isPowerOf2(this.height)?(this.power_of_2=!0,r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_S,t.TEXTURE_WRAP_S||t.repeat&&r.REPEAT||r.CLAMP_TO_EDGE),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_T,t.TEXTURE_WRAP_T||t.repeat&&r.REPEAT||r.CLAMP_TO_EDGE),"mipmap"===t.filtering?(this.filtering="mipmap",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.LINEAR_MIPMAP_LINEAR),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.LINEAR),r.generateMipmap(r.TEXTURE_2D)):"linear"===t.filtering?(this.filtering="linear",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.LINEAR),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.LINEAR)):"nearest"===t.filtering&&(this.filtering="nearest",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.NEAREST),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.NEAREST))):(this.power_of_2=!1,r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_S,r.CLAMP_TO_EDGE),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_T,r.CLAMP_TO_EDGE),"nearest"===t.filtering?(this.filtering="nearest",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.NEAREST),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.NEAREST)):(this.filtering="linear",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.LINEAR),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.LINEAR))),e.trigger("update",this)}}},{key:"calculateSprites",value:function(){if(this.sprites)for(var t in this.sprites){var r=this.sprites[t];this.texcoords[t]=e.getTexcoordsForSprite([r[0],r[1]],[r[2],r[3]],[this.width,this.height]),this.sizes[t]=[r[2],r[3]]}}}]),e}();r.default=p,p.create=function(e,t,r){return new p(e,t,r)},p.retain=function(e){p.textures[e]&&p.textures[e].retain()},p.release=function(e){p.textures[e]&&p.textures[e].release()},p.destroy=function(e){var t=Object.keys(p.textures);t.forEach(function(t){var r=p.textures[t];r.gl===e&&r.destroy({force:!0})})},p.getSpriteInfo=function(e,t){var r=p.textures[e];return r&&{size:r.sizes[t],texcoords:r.texcoords[t]}},p.getTexcoordsForSprite=function(e,t,r){var n=r[1]-e[1]-t[1];return[e[0]/r[0],n/r[1],(t[0]+e[0])/r[0],(t[1]+n)/r[1]]},p.createFromObject=function(e,t){var r=[];if(t)for(var n in t){var i=t[n];if(p.changed(n,i)){var o=p.create(e,n,i);r.push(o.loading)}}return Promise.all(r)},p.default="__default",p.createDefault=function(e){return p.create(e,p.default)},p.changed=function(e,t){var r=p.textures[e];if(r){if("element"===r.config_type||null!=t.element)return!0;if(JSON.stringify(p.texture_configs[e])===JSON.stringify(Object.assign({name:e},t)))return!1}return!0},p.getInfo=function(e){if(e||(e=Object.keys(p.textures)),Array.isArray(e))return Promise.all(e.map(function(e){return p.getInfo(e)}));var t=p.textures[e];if(t){var r=t.loading||Promise.resolve(t);return r.then(function(){return{name:t.name,width:t.width,height:t.height,sprites:t.sprites,texcoords:t.texcoords,sizes:t.sizes,filtering:t.filtering,power_of_2:t.power_of_2,valid:t.valid}})}return Promise.resolve(null)},p.syncTexturesToWorker=function(e){return d.default.postMessage("Texture.getInfo",e).then(function(e){return e.forEach(function(e){p.textures[e.name]=e}),p.textures})},p.getMaxTextureSize=function(e){return 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this.components.push([o.type,null,a,u]);this.index[o.name]=r,r+=o.size}}return o(e,[{key:"enable",value:function(t,r,n){for(var i,o,a=0;a<this.attribs.length;a++)i=this.attribs[a],o=r.attribute(i.name).location,-1!==o&&((!e.enabled_attribs[o]||n)&&t.enableVertexAttribArray(o),t.vertexAttribPointer(o,i.size,i.type,i.normalized,this.stride,i.offset),e.enabled_attribs[o]=r);for(o in e.enabled_attribs)this.disableUnusedAttribute(t,o,r)}},{key:"disableUnusedAttribute",value:function(t,r,n){e.enabled_attribs[r]!==n&&(t.disableVertexAttribArray(r),delete e.enabled_attribs[r])}},{key:"createVertexData",value:function(){return new l.default(this)}}]),e}();r.default=c,c.enabled_attribs={}},{"./constants":204,"./vertex_data":213}],216:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i,o=e("./repeat_group"),a=n(o),s=e("../utils/log"),u=n(s);r.default=i={tiles:{},startTile:function(e){var t=this.tiles[e]={bboxes:{aabb:[],obb:[]},objects:{},keep:{},styles:{}};t.complete=new Promise(function(e,r){t.resolve=e,t.reject=r})},resetTile:function(e){delete this.tiles[e]},addStyle:function(e,t){this.tiles[t].styles[e]=!0},collide:function(e,t,r){var n=this.tiles[r];if(!n)return u.default("trace","Collision.collide() called with null tile",r,this.tiles,t,e),Promise.resolve([]);for(var i=n.objects,o=0;o<e.length;o++){var a=e[o],s=a.label.layout.priority;i[s]=i[s]||{},i[s][t]=i[s][t]||[],i[s][t].push(a)}return delete n.styles[t],0===Object.keys(n.styles).length&&this.endTile(r),n.complete.then(function(){return n.keep[t]||[]})},endTile:function(e){var t=this.tiles[e],r=t.keep;a.default.clear(e);for(var n=Object.keys(t.objects).sort(function(e,t){return e-t}),i=0;i<n.length;i++){var o=t.objects[n[i]];if(o)for(var s in o){var u=o[s];r[s]=r[s]||[];for(var l=0;l<u.length;l++){var c=u[l];this.canBePlaced(c,e,c.linked)&&(c.linked?this.canBePlaced(c.linked,e,c)&&(r[s].push(c),this.place(c,e),this.place(c.linked,e)):(r[s].push(c),this.place(c,e)))}}}delete this.tiles[e],t.resolve()},canBePlaced:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null,n=e.label,i=e.label.layout;if(null!=n.placed)return n.placed;var o=this.tiles[t].bboxes;if(i.collide&&n.discard(o,r&&r.label))i.collide&&(n.placed=!1);else{var s=a.default.check(n,i,t);if(!s)return!0;n.placed=!1}return n.placed},place:function(e,t){var r=e.label;null==r.placed&&(a.default.add(r,r.layout,t),r.add(this.tiles[t].bboxes))}}},{"../utils/log":261,"./repeat_group":223}],217:[function(e,t,r){"use strict";function n(e,t){return e[2]<t[0]||e[0]>t[2]||e[3]<t[1]||e[1]>t[3]?!1:!0}function i(e,t,r){for(var i=0;i<t.length&&(!n(e,t[i])||null==r(i));i++);}Object.defineProperty(r,"__esModule",{value:!0}),r.boxIntersectsBox=n,r.boxIntersectsList=i},{}],218:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./point_anchor"),s=n(a),u=e("./intersect"),l=e("../utils/utils"),c=n(l),f=e("../utils/obb"),h=n(f),d=function(){function e(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};i(this,e),this.size=t,this.layout=r,this.position=null,this.anchor=Array.isArray(this.layout.anchor)?this.layout.anchor[0]:this.layout.anchor,this.placed=null,this.offset=r.offset,this.aabb=null,this.obb=null,this.align="center",this.throw_away=!1}return 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n=this.positions[r],i=t[0]-n[0],o=t[1]-n[1],a=i*i+o*o;if(a<this.repeat_dist_sq)return{dist_sq:a,repeat_dist_sq:this.repeat_dist_sq}}}},{key:"add",value:function(e){e&&e.position&&this.positions.push(e.position)}}],[{key:"clear",value:function(e){this.groups[e]={}}},{key:"check",value:function(e,t,r){return t.repeat_distance&&t.repeat_group&&this.groups[r][t.repeat_group]?this.groups[r][t.repeat_group].check(e):void 0}},{key:"add",value:function(t,r,n){r.repeat_distance&&r.repeat_group&&(null==this.groups[n][r.repeat_group]&&(this.groups[n][r.repeat_group]=new e(r.repeat_group,r.repeat_distance,e.max_repeat_dist)),this.groups[n][r.repeat_group].add(t))}}]),e}();r.default=u,u.groups={},u.max_repeat_dist=s.default.tile_scale},{"../geo":203}],224:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){return o(e)}function o(e){if("undefined"!=typeof p)return new p(e);if(s.default.is_main){var t=e.leaflet||window.L,n=t.GridLayer?t.GridLayer:t.TileLayer,i=n===t.GridLayer?"1.x":"0.7.x",o={},a=void 0,u=void 0;return n===t.TileLayer&&(o._addTile=function(){},o._removeTile=function(){},o._reset=function(){n.prototype._reset.apply(this,arguments),this.scene&&this.scene.container&&this.scene.canvas&&this.scene.container.appendChild(this.scene.canvas)}),Object.assign(o,{initialize:function(e){e.showDebug=e.showDebug?!0:!1,t.setOptions(this,e),this.createScene(),this.hooks={},this._updating_tangram=!1,this._zoomAnimated=!1},createScene:function(){this.scene=l.default.create(this.options.scene,{numWorkers:this.options.numWorkers,preUpdate:this.options.preUpdate,postUpdate:this.options.postUpdate,continuousZoom:"1.x"===p.leafletVersion,highDensityDisplay:this.options.highDensityDisplay,logLevel:this.options.logLevel,introspection:this.options.introspection,disableRenderLoop:this.options.disableRenderLoop})},onAdd:function(e){var t=this;this.scene||this.createScene(),n.prototype.onAdd.apply(this,arguments),this.hooks.resize=function(){t._updating_tangram=!0,t.updateSize(),t._updating_tangram=!1},e.on("resize",this.hooks.resize),this.hooks.move=function(){if(!t._updating_tangram){t._updating_tangram=!0,t.scene.view.setPanning(!0);var r=e.getCenter();r.zoom=Math.min(e.getZoom(),e.getMaxZoom()||f.default.default_view_max_zoom),t.scene.view.setView(r),t._mapLayerCount>1&&t.scene.immediateRedraw(),t.reverseTransform(),t._updating_tangram=!1}},e.on("move",this.hooks.move),this.hooks.zoomstart=function(){t._updating_tangram||(t._updating_tangram=!0,t.scene.view.startZoom(),t._updating_tangram=!1)},e.on("zoomstart",this.hooks.zoomstart),this.hooks.moveend=function(){t.scene.view.setPanning(!1),t.scene.requestRedraw()},e.on("moveend",this.hooks.moveend),this.modifyScrollWheelBehavior(e),this.modifyDoubleClickZoom(e),u=d.default(function(e){e._moveEnd(!0),e.fire("viewreset")},2*e.options.wheelDebounceTime),this.trackMapLayerCounts(e),this.setupSelectionEventHandlers(e),this.setSelectionEvents(this.options.events),this.scene.container=this.getContainer(),this.updateSize(),this.updateView(),this.resizeOnFirstVisible(),this.scene.subscribe({move:this.onTangramViewUpdate.bind(this)}),this.scene.load(this.options.scene,{config_path:this.options.sceneBasePath,blocking:!1}).then(function(){t._updating_tangram=!0,t.updateSize(),t.updateView(),t.reverseTransform(),t._updating_tangram=!1,t.fire("init")}).catch(function(e){t.fire("error",e)})},onRemove:function(e){n.prototype.onRemove.apply(this,arguments),e.off("layeradd layerremove overlayadd overlayremove",this._updateMapLayerCount),e.off("resize",this.hooks.resize),e.off("move",this.hooks.move),e.off("zoomstart",this.hooks.zoomstart),e.off("moveend",this.hooks.moveend),e.off("click",this.hooks.click),e.off("mousemove",this.hooks.mousemove),e.off("mouseout",this.hooks.mouseout),document.removeEventListener("visibilitychange",this.hooks.visibilitychange),this.hooks={},this.scene&&(this.scene.destroy(),this.scene=null)},createTile:function(e){var t=e.x+"/"+e.y+"/"+e.z,r=document.createElement("div");if(r.setAttribute("data-tile-key",t),r.style.width="256px",r.style.height="256px",this.options.showDebug){var n=document.createElement("div");n.textContent=t,n.style.position="absolute",n.style.left=0,n.style.top=0,n.style.color="white",n.style.fontSize="16px",n.style.textOutline="1px #000000",n.style.padding="8px",r.appendChild(n),r.style.borderStyle="solid",r.style.borderColor="white",r.style.borderWidth="1px"}return r},modifyScrollWheelBehavior:function(e){if(this.scene.view.continuous_zoom&&e.scrollWheelZoom&&this.options.modifyScrollWheel!==!1){e.options.zoomSnap=0;var r=e.scrollWheelZoom.enabled();e.scrollWheelZoom.disable(),t.Browser.chrome||t.Browser.safari?e.scrollWheelZoom._onWheelScroll=function(e){var r=t.DomEvent.getWheelDelta(e);this._delta+=r,this._lastMousePos=this._map.mouseEventToContainerPoint(e),this._performZoom(),t.DomEvent.stop(e)}:e.options.wheelDebounceTime=20,e.scrollWheelZoom._performZoom=function(){var e=this._map,t=e.getZoom();e._stop();var r=this._delta/(4*this._map.options.wheelPxPerZoomLevel);this._delta=0,t+r>=this._map.getMaxZoom()&&(r=this._map.getMaxZoom()-t),r&&("center"===e.options.scrollWheelZoom?a(e,e.getCenter(),t+r):a(e,this._lastMousePos,t+r),u(e))},r&&e.scrollWheelZoom.enable()}},modifyDoubleClickZoom:function(e){if(this.scene.view.continuous_zoom&&e.doubleClickZoom&&this.options.modifyDoubleClickZoom!==!1){var r=function(e,r,n,i){function o(){var i=(Date.now()-c)/h;if(1>=i){e._flyToFrame=t.Util.requestAnimFrame(o,e);var d=u.add(l.subtract(u).multiplyBy(i));d=[d.x,d.y],d=f.default.metersToLatLng(d),a(e,r,s+(n-s)*i)}else a(e,r,n)._moveEnd(!0)}if(i=i||{},i.animate===!1||!t.Browser.any3d)return e.setView(r,n,i);e._stop();var s=e._zoom;r=t.latLng(r),n=void 0===n?s:n,n=Math.min(n,e.getMaxZoom());var u=e.project(e.getCenter(),s),l=e.project(r,s),c=Date.now(),h=i.duration?1e3*i.duration:75;return e._moveStart(!0),o.call(e),e},n=e.doubleClickZoom.enabled();e.doubleClickZoom.disable(),e.doubleClickZoom._onDoubleClick=function(e){var t=this._map,n=t.getZoom(),i=t.options.zoomDelta,o=e.originalEvent.shiftKey?n-i:n+i;"center"===t.options.doubleClickZoom?r(t,t.getCenter(),o):r(t,t.containerPointToLatLng(e.containerPoint),o)},n&&e.doubleClickZoom.enable()}},updateView:function(){var e=this._map.getCenter();e.zoom=Math.min(this._map.getZoom(),this._map.getMaxZoom()||f.default.default_view_max_zoom),this.scene.view.setView(e)},updateSize:function(){var e=this._map.getSize();this.scene.resizeMap(e.x,e.y)},resizeOnFirstVisible:function(){var e=this,t=!0;this.hooks.visibilitychange=function(){t&&(t=!1,e.updateSize())},document.addEventListener("visibilitychange",this.hooks.visibilitychange)},onTangramViewUpdate:function(){if(this._map&&!this._updating_tangram){var e=this._map.getCenter(),t=this.scene.view.center;(e.lng!==t.lng||e.lat!==t.lat||this._map.getZoom()!==this.scene.view.zoom)&&(this._updating_tangram=!0,this._map.setView([this.scene.view.center.lat,this.scene.view.center.lng],this.scene.view.zoom,{animate:!1}),this.reverseTransform(),this._updating_tangram=!1)}},render:function(){this.scene&&this.scene.update()},reverseTransform:function(){if(this._map&&this.scene&&this.scene.container){var e=this._map.containerPointToLayerPoint([0,0]);t.DomUtil.setPosition(this.scene.container,e)}},setupSelectionEventHandlers:function(e){var t=this;this._selection_events={},this.hooks.click=function(e){"function"==typeof t._selection_events.click&&t.scene.getFeatureAt(e.containerPoint).then(function(r){var n=Object.assign({},r,{leaflet_event:e});t._selection_events.click(n)})},e.on("click",this.hooks.click),this.hooks.mousemove=function(e){"function"==typeof t._selection_events.hover&&t.scene.getFeatureAt(e.containerPoint).then(function(r){var n=Object.assign({},r,{leaflet_event:e});t._selection_events.hover(n)})},e.on("mousemove",this.hooks.mousemove),this.hooks.mouseout=function(e){"function"==typeof t._selection_events.hover&&t._selection_events.hover({changed:!0,leaflet_event:e})},e.on("mouseout",this.hooks.mouseout)},setSelectionEvents:function(e){this._selection_events=Object.assign(this._selection_events,e)},trackMapLayerCounts:function(e){var t=this;this._updateMapLayerCount=function(){var r=e.getPanes().mapPane.childNodes;t._mapLayerCount=0;for(var n=0;n<r.length;n++)t._mapLayerCount+=r[n].childNodes.length},e.on("layeradd layerremove overlayadd overlayremove",this._updateMapLayerCount),this._updateMapLayerCount()}}),a=function(e,r,n){var i=e.getZoomScale(n),o=e.getSize().divideBy(2),a=r instanceof t.Point?r:e.latLngToContainerPoint(r),s=a.subtract(o).multiplyBy(1-1/i),u=e.containerPointToLatLng(o.add(s));return e._move(u,n,{flyTo:!0})},r.LeafletLayer=p=n.extend(o),"function"!=typeof p.remove&&(p.prototype.remove=function(){this._map&&this._map.removeLayer(this),this.fire("remove")}),p.layerBaseClass=n,p.leafletVersion=i,new p(e)}}Object.defineProperty(r,"__esModule",{value:!0}),r.LeafletLayer=void 0,r.leafletLayer=i;var a=e("./utils/thread"),s=n(a),u=e("./scene"),l=n(u),c=e("./geo"),f=n(c),h=e("./utils/debounce"),d=n(h),p=r.LeafletLayer=void 0},{"./geo":203,"./scene":228,"./utils/debounce":256,"./utils/thread":267}],225:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function o(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function a(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var s=function(){function e(e,t){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=e[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!t||r.length!==t);n=!0);}catch(u){i=!0,o=u}finally{try{!n&&s["return"]&&s["return"]()}finally{if(i)throw o}}return r}return function(t,r){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return e(t,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),u=function R(e,t,r){null===e&&(e=Function.prototype);var n=Object.getOwnPropertyDescriptor(e,t);if(void 0===n){var i=Object.getPrototypeOf(e);return null===i?void 0:R(i,t,r)}if("value"in n)return n.value;var o=n.get;return void 0===o?void 0:o.call(r)},l=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),c=e("./gl/shader_program"),f=n(c),h=e("./gl/glsl"),d=n(h),p=e("./geo"),_=n(p),m=e("./vector"),g=n(m),v=e("./styles/style_parser"),y="/*\n\nExpected globals:\nlight_accumulator_*\n\n*/\n\nstruct AmbientLight {\n    vec3 ambient;\n};\n\nvoid calculateLight(in AmbientLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n    light_accumulator_ambient.rgb += _light.ambient;\n}\n",b="/*\n\nExpected globals:\nmaterial\nlight_accumulator_*\n\n*/\n\nstruct DirectionalLight {\n    vec3 ambient;\n    vec3 diffuse;\n    vec3 specular;\n    vec3 direction;\n};\n\nvoid calculateLight(in DirectionalLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n\n    light_accumulator_ambient.rgb += _light.ambient;\n\n    float nDotVP = clamp(dot(_normal, -_light.direction), 0.0, 1.0);\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        light_accumulator_diffuse.rgb += _light.diffuse * nDotVP;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        float pf = 0.0;\n        if (nDotVP > 0.0) {\n            vec3 reflectVector = reflect(_light.direction, _normal);\n            float eyeDotR = max(dot(normalize(_eyeToPoint), reflectVector), 0.0);\n            pf = pow(eyeDotR, material.shininess);\n        }\n        light_accumulator_specular.rgb += _light.specular * pf;\n    #endif\n}\n",x="/*\n\nExpected globals:\nmaterial\nlight_accumulator_*\n\n*/\n\nstruct PointLight {\n    vec3 ambient;\n    vec3 diffuse;\n    vec3 specular;\n    vec4 position;\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n    float attenuationExponent;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n    float innerRadius;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n    float outerRadius;\n#endif\n};\n\nvoid calculateLight(in PointLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n\n    float dist = length(_light.position.xyz - _eyeToPoint);\n\n    // Compute vector from surface to light position\n    vec3 VP = (_light.position.xyz - _eyeToPoint) / dist;\n\n    // Normalize the vector from surface to light position\n    float nDotVP = clamp(dot(VP, _normal), 0.0, 1.0);\n\n    // Attenuation defaults\n    float attenuation = 1.0;\n    #ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n        float Rin = 1.0;\n        float e = _light.attenuationExponent;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n        #endif\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n            float Rdiff = _light.outerRadius-Rin;\n            float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n            attenuation = 1.0-(pow(d,e));\n        #else\n            // If no outer is provide behaves like:\n            // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n            float d = max(0.0,dist-Rin)/Rin+1.0;\n            attenuation = clamp(1.0/(pow(d,e)), 0.0, 1.0);\n        #endif\n    #else\n        float Rin = 0.0;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float Rdiff = _light.outerRadius-Rin;\n                float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                // If no outer is provide behaves like:\n                // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n                float d = max(0.0,dist-Rin)/Rin+1.0;\n                attenuation = clamp(1.0/d, 0.0, 1.0);\n            #endif\n        #else\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float d = clamp(dist/_light.outerRadius, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                attenuation = 1.0;\n            #endif\n        #endif\n    #endif\n\n    // Computer accumulators\n    light_accumulator_ambient.rgb += _light.ambient * attenuation;\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        light_accumulator_diffuse.rgb += _light.diffuse * nDotVP * attenuation;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        float pf = 0.0; // power factor for shiny speculars\n        if (nDotVP > 0.0) {\n            vec3 reflectVector = reflect(-VP, _normal);\n            float eyeDotR = max(0.0, dot(-normalize(_eyeToPoint), reflectVector));\n            pf = pow(eyeDotR, material.shininess);\n        }\n\n        light_accumulator_specular.rgb += _light.specular * pf * attenuation;\n    #endif\n}\n",w="/*\n\nExpected globals:\nmaterial\nlight_accumulator_*\n\n*/\n\nstruct SpotLight {\n    vec3 ambient;\n    vec3 diffuse;\n    vec3 specular;\n    vec4 position;\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n    float attenuationExponent;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n    float innerRadius;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n    float outerRadius;\n#endif\n\n    vec3 direction;\n    float spotCosCutoff;\n    float spotExponent;\n};\n\nvoid calculateLight(in SpotLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n\n    float dist = length(_light.position.xyz - _eyeToPoint);\n\n    // Compute vector from surface to light position\n    vec3 VP = (_light.position.xyz - _eyeToPoint) / dist;\n\n    // normal . light direction\n    float nDotVP = clamp(dot(_normal, VP), 0.0, 1.0);\n\n    // Attenuation defaults\n    float attenuation = 1.0;\n    #ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n        float Rin = 1.0;\n        float e = _light.attenuationExponent;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n        #endif\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n            float Rdiff = _light.outerRadius-Rin;\n            float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n            attenuation = 1.0-(pow(d,e));\n        #else\n            // If no outer is provide behaves like:\n            // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n            float d = max(0.0,dist-Rin)/Rin+1.0;\n            attenuation = clamp(1.0/(pow(d,e)), 0.0, 1.0);\n        #endif\n    #else\n        float Rin = 0.0;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float Rdiff = _light.outerRadius-Rin;\n                float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                // If no outer is provide behaves like:\n                // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n                float d = max(0.0,dist-Rin)/Rin+1.0;\n                attenuation = clamp(1.0/d, 0.0, 1.0);\n            #endif\n        #else\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float d = clamp(dist/_light.outerRadius, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                attenuation = 1.0;\n            #endif\n        #endif\n    #endif\n\n    // spotlight attenuation factor\n    float spotAttenuation = 0.0;\n\n    // See if point on surface is inside cone of illumination\n    float spotDot = clamp(dot(-VP, _light.direction), 0.0, 1.0);\n\n    if (spotDot >= _light.spotCosCutoff) {\n        spotAttenuation = pow(spotDot, _light.spotExponent);\n    }\n\n    light_accumulator_ambient.rgb += _light.ambient * attenuation * spotAttenuation;\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        light_accumulator_diffuse.rgb += _light.diffuse * nDotVP * attenuation * spotAttenuation;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        // Power factor for shiny speculars\n        float pf = 0.0;\n        if (nDotVP > 0.0) {\n            vec3 reflectVector = reflect(-VP, _normal);\n            float eyeDotR = max(dot(-normalize(_eyeToPoint), reflectVector), 0.0);\n            pf = pow(eyeDotR, material.shininess);\n        }\n        light_accumulator_specular.rgb += _light.specular * pf * attenuation * spotAttenuation;\n    #endif\n}\n",k=function(){function e(t,r){a(this,e),this.name=r.name,this.view=t,this.ambient=null==r.ambient||"number"==typeof r.ambient?d.default.expandVec3(r.ambient||0):v.StyleParser.parseColor(r.ambient).slice(0,3),this.diffuse=null==r.diffuse||"number"==typeof r.diffuse?d.default.expandVec3(null!=r.diffuse?r.diffuse:1):v.StyleParser.parseColor(r.diffuse).slice(0,3),this.specular=null==r.specular||"number"==typeof r.specular?d.default.expandVec3(r.specular||0):v.StyleParser.parseColor(r.specular).slice(0,3)}return l(e,[{key:"inject",value:function(){var t="\n            uniform "+this.struct_name+" u_"+this.name+";\n            "+this.struct_name+" "+this.name+";\n            ",r="\n            "+this.name+" = u_"+this.name+";\n\n        ";f.default.addBlock(e.block,t),f.default.addBlock("setup",r)}},{key:"update",value:function(){}},{key:"setupProgram",value:function(e){e.uniform("3fv","u_"+this.name+".ambient",this.ambient),e.uniform("3fv","u_"+this.name+".diffuse",this.diffuse),e.uniform("3fv","u_"+this.name+".specular",this.specular)}}],[{key:"create",value:function(t,r){return e.types[r.type]?new e.types[r.type](t,r):void 0}},{key:"setMode",value:function(t,r){t===!0&&(t="fragment"),t=e.enabled&&(null!=t?t:"fragment"),r.defines.TANGRAM_LIGHTING_FRAGMENT="fragment"===t,r.defines.TANGRAM_LIGHTING_VERTEX="vertex"===t}},{key:"inject",value:function(t){if(f.default.removeBlock(e.block),e.enabled){var r="";if(t&&Object.keys(t).length>0){var n={};for(var i in t)n[t[i].type]=!0;for(var o in n)e.types[o].inject();for(var a in t)t[a].inject(),r+="calculateLight("+a+", _eyeToPoint, _normal);\n"}var s="\n            vec4 calculateLighting(in vec3 _eyeToPoint, in vec3 _normal, in vec4 _color) {\n\n                // Do initial material calculations over normal, emission, ambient, diffuse and specular values\n                calculateMaterial(_eyeToPoint,_normal);\n\n                // Un roll the loop of individual ligths to calculate\n                "+r+"\n\n                //  Final light intensity calculation\n                vec4 color = vec4(vec3(0.), _color.a); // start with vertex color alpha\n\n                #ifdef TANGRAM_MATERIAL_EMISSION\n                    color.rgb = material.emission.rgb;\n                    color.a *= material.emission.a;\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_AMBIENT\n                    color.rgb += light_accumulator_ambient.rgb * _color.rgb * material.ambient.rgb;\n                    color.a *= material.ambient.a;\n                #else\n                    #ifdef TANGRAM_MATERIAL_DIFFUSE\n                        color.rgb += light_accumulator_ambient.rgb * _color.rgb * material.diffuse.rgb;\n                    #endif\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_DIFFUSE\n                    color.rgb += light_accumulator_diffuse.rgb * _color.rgb * material.diffuse.rgb;\n                    color.a *= material.diffuse.a;\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_SPECULAR\n                    color.rgb += light_accumulator_specular.rgb * material.specular.rgb;\n                    color.a *= material.specular.a;\n                #endif\n\n                // Clamp final color\n                color = clamp(color, 0.0, 1.0);\n\n                return color;\n            }";f.default.addBlock(e.block,s)}}}]),e}();r.default=k,k.types={},k.block="lighting",k.enabled=!0;var A=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.type="ambient",n.struct_name="AmbientLight",n}return o(t,e),l(t,[{key:"setupProgram",value:function(e){e.uniform("3fv","u_"+this.name+".ambient",this.ambient)}}],[{key:"inject",value:function(){f.default.addBlock(k.block,y)}}]),t}(k);k.types.ambient=A;var T=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));if(n.type="directional",n.struct_name="DirectionalLight",r.direction)n._direction=r.direction;else{var o=135,s=Math.sin(60*Math.PI/180);n._direction=[Math.cos(Math.PI*o/180)*s,Math.sin(Math.PI*o/180)*s,-.5],null==r.ambient&&(n.ambient=d.default.expandVec3(.5))}return n.direction=n._direction.map(parseFloat),n}return o(t,e),l(t,[{key:"setupProgram",value:function(e){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"setupProgram",this).call(this,e),e.uniform("3fv","u_"+this.name+".direction",this.direction)}},{key:"direction",get:function(){return this._direction},set:function(e){this._direction=g.default.normalize(e)}}],[{key:"inject",value:function(){f.default.addBlock(k.block,b)}}]),t}(k);k.types.directional=T;var E=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.type="point",n.struct_name="PointLight",n.position=r.position||[0,0,"100px"],n.position_eye=[],n.origin=r.origin||"ground",n.attenuation=isNaN(parseFloat(r.attenuation))?0:parseFloat(r.attenuation),n.radius=r.radius?Array.isArray(r.radius)&&2===r.radius.length?r.radius:[null,r.radius]:null,n}return o(t,e),l(t,[{key:"inject",value:function(){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"inject",this).call(this),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT=0!==this.attenuation,f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS=null!=this.radius&&null!=this.radius[0],f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS=null!=this.radius}},{key:"update",value:function(){this.updateEyePosition()}},{key:"updateEyePosition",value:function(){if("world"===this.origin){var e=_.default.latLngToMeters(this.position),t=s(e,2),r=t[0],n=t[1];this.position_eye[0]=r-this.view.camera.position_meters[0],this.position_eye[1]=n-this.view.camera.position_meters[1],this.position_eye[2]=v.StyleParser.convertUnits(this.position[2],{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)}),this.position_eye[2]=this.position_eye[2]-this.view.camera.position_meters[2]}else("ground"===this.origin||"camera"===this.origin)&&(this.position_eye=v.StyleParser.convertUnits(this.position,{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)}),"ground"===this.origin&&(this.position_eye[2]=this.position_eye[2]-this.view.camera.position_meters[2]));this.position_eye[3]=1}},{key:"setupProgram",value:function(e){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"setupProgram",this).call(this,e),e.uniform("4fv","u_"+this.name+".position",this.position_eye),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT&&e.uniform("1f","u_"+this.name+".attenuationExponent",this.attenuation),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS&&e.uniform("1f","u_"+this.name+".innerRadius",v.StyleParser.convertUnits(this.radius[0],{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)})),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS&&e.uniform("1f","u_"+this.name+".outerRadius",v.StyleParser.convertUnits(this.radius[1],{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)}))}}],[{key:"inject",value:function(){f.default.addBlock(k.block,x)}}]),t}(k);k.types.point=E;var S=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.type="spotlight",n.struct_name="SpotLight",n.direction=n._direction=(r.direction||[0,0,-1]).map(parseFloat),n.exponent=r.exponent?parseFloat(r.exponent):.2,n.angle=r.angle?parseFloat(r.angle):20,n}return o(t,e),l(t,[{key:"setupProgram",value:function(e){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"setupProgram",this).call(this,e),e.uniform("3fv","u_"+this.name+".direction",this.direction),e.uniform("1f","u_"+this.name+".spotCosCutoff",Math.cos(3.14159*this.angle/180)),e.uniform("1f","u_"+this.name+".spotExponent",this.exponent)}},{key:"direction",get:function(){return this._direction},set:function(e){this._direction=g.default.normalize(e)}}],[{key:"inject",value:function(){f.default.addBlock(k.block,w)}}]),t}(E);k.types.spotlight=S},{"./geo":203,"./gl/glsl":207,"./gl/shader_program":209,"./styles/style_parser":247,"./vector":272}],226:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./gl/glsl"),s=n(a),u=e("./styles/style_parser"),l="/*\n\nDefines globals:\nmaterial\nlight_accumulator_*\n\n*/\n\n\n// MATERIALS\n//\nstruct Material {\n    #ifdef TANGRAM_MATERIAL_EMISSION\n        vec4 emission;\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE\n            vec3 emissionScale;\n        #endif\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_AMBIENT\n        vec4 ambient;\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE\n            vec3 ambientScale;\n        #endif\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        vec4 diffuse;\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE\n            vec3 diffuseScale;\n        #endif\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        vec4 specular;\n        float shininess;\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE\n            vec3 specularScale;\n        #endif\n    #endif\n\n\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE\n        vec3 normalScale;\n        float normalAmount;\n    #endif\n};\n\n// Note: uniform is copied to a global instance to allow modification\nuniform Material u_material;\nMaterial material;\n\n#ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE\nuniform sampler2D u_material_emission_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE\nuniform sampler2D u_material_ambient_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE\nuniform sampler2D u_material_diffuse_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE\nuniform sampler2D u_material_specular_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE\nuniform sampler2D u_material_normal_texture;\n#endif\n\n// Global light accumulators for each property\nvec4 light_accumulator_ambient = vec4(vec3(0.0), 1.);\nvec4 light_accumulator_diffuse = vec4(vec3(0.0), 1.);\n#ifdef TANGRAM_MATERIAL_SPECULAR\n    vec4 light_accumulator_specular = vec4(vec3(0.0), 1.);\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_TEXTURE_SPHEREMAP\nvec4 getSphereMap (in sampler2D _tex, in vec3 _eyeToPoint, in vec3 _normal, in vec2 _skew) {\n    vec3 eye = normalize(_eyeToPoint);\n    eye.xy -= _skew;\n    eye = normalize(eye);\n\n    vec3 r = reflect(eye, _normal);\n    r.z += 1.0;\n    float m = 2. * length(r);\n    vec2 uv = r.xy / m + .5;\n    return texture2D(_tex, uv);\n}\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_TEXTURE_TRIPLANAR\nvec3 getTriPlanarBlend (in vec3 _normal) {\n    vec3 blending = abs(_normal);\n    blending = normalize(max(blending, 0.00001));\n    float b = (blending.x + blending.y + blending.z);\n    return blending / b;\n}\n\nvec4 getTriPlanar (in sampler2D _tex, in vec3 _pos, in vec3 _normal, in vec3 _scale) {\n    vec3 blending = getTriPlanarBlend(_normal);\n    vec4 xaxis = texture2D(_tex, fract(_pos.yz * _scale.x));\n    vec4 yaxis = texture2D(_tex, fract(_pos.xz * _scale.y));\n    vec4 zaxis = texture2D(_tex, fract(_pos.xy * _scale.z));\n    return  xaxis * blending.x + yaxis * blending.y + zaxis * blending.z;\n}\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_TEXTURE_PLANAR\nvec4 getPlanar (in sampler2D _tex, in vec3 _pos, in vec2 _scale) {\n    return texture2D( _tex, fract(_pos.xy * _scale.x) );\n}\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE\nvoid calculateNormal (inout vec3 _normal) {\n    // Get NORMALMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE_UV\n    _normal += texture2D(u_material_normal_texture, fract(v_texcoord*material.normalScale.xy)).rgb*2.0-1.0;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE_PLANAR\n    vec3 normalTex = getPlanar(u_material_normal_texture, v_world_position.xyz, material.normalScale.xy).rgb*2.0-1.0;\n    _normal += normalTex;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE_TRIPLANAR\n    vec3 normalTex = getTriPlanar(u_material_normal_texture, v_world_position.xyz, _normal, material.normalScale).rgb*2.0-1.0;\n    _normal += normalTex;\n    #endif\n\n    _normal = normalize(_normal);\n}\n#endif\n\nvoid calculateMaterial (in vec3 _eyeToPoint, inout vec3 _normal) {\n    // get EMISSION TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_UV\n        material.emission *= texture2D(u_material_emission_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_PLANAR\n        material.emission *= getPlanar(u_material_emission_texture, v_world_position.xyz, material.emissionScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_TRIPLANAR\n        material.emission *= getTriPlanar(u_material_emission_texture, v_world_position.xyz, _normal, material.emissionScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_SPHEREMAP\n        material.emission *= getSphereMap(u_material_emission_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n\n    // get AMBIENT TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_UV\n        material.ambient *= texture2D(u_material_ambient_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_PLANAR\n        material.ambient *= getPlanar(u_material_ambient_texture, v_world_position.xyz, material.ambientScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_TRIPLANAR\n        material.ambient *= getTriPlanar(u_material_ambient_texture, v_world_position.xyz, _normal, material.ambientScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_SPHEREMAP\n        material.ambient *= getSphereMap(u_material_ambient_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n\n    // get DIFFUSE TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_UV\n        material.diffuse *= texture2D(u_material_diffuse_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_PLANAR\n        material.diffuse *= getPlanar(u_material_diffuse_texture, v_world_position.xyz, material.diffuseScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_TRIPLANAR\n        material.diffuse *= getTriPlanar(u_material_diffuse_texture, v_world_position.xyz, _normal, material.diffuseScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_SPHEREMAP\n        material.diffuse *= getSphereMap(u_material_diffuse_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n\n    // get SPECULAR TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_UV\n        material.specular *= texture2D(u_material_specular_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_PLANAR\n        material.specular *= getPlanar(u_material_specular_texture, v_world_position.xyz, material.specularScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_TRIPLANAR\n        material.specular *= getTriPlanar(u_material_specular_texture, v_world_position.xyz, _normal, material.specularScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_SPHEREMAP\n        material.specular *= getSphereMap(u_material_specular_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n}\n",c=["emission","ambient","diffuse","specular"],f=function(){function e(t){var r=this;
-i(this,e),t=t||{},c.forEach(function(e){var n=t[e];null!=n&&(r[e]=n.texture?{texture:n.texture,mapping:n.mapping||"spheremap",scale:s.default.expandVec3(null!=n.scale?n.scale:1),amount:s.default.expandVec4(null!=n.amount?n.amount:1)}:"number"==typeof n||Array.isArray(n)?{amount:s.default.expandVec4(n)}:"string"==typeof n?{amount:u.StyleParser.parseColor(n)}:n)}),this.specular&&(this.specular.shininess=t.shininess?parseFloat(t.shininess):.2),null!=t.normal&&(this.normal={texture:t.normal.texture,mapping:t.normal.mapping||"triplanar",scale:s.default.expandVec3(null!=t.normal.scale?t.normal.scale:1),amount:null!=t.normal.amount?t.normal.amount:1})}return o(e,[{key:"inject",value:function(t){var r=this;c.forEach(function(e){var n="TANGRAM_MATERIAL_"+e.toUpperCase(),i=n+"_TEXTURE";t.defines[n]=null!=r[e],r[e]&&r[e].texture&&(t.defines[i]=!0,t.defines[i+"_"+r[e].mapping.toUpperCase()]=!0,t.defines["TANGRAM_MATERIAL_TEXTURE_"+r[e].mapping.toUpperCase()]=!0,t.texcoords=t.texcoords||"uv"===r[e].mapping)}),this.normal&&this.normal.texture&&(t.defines.TANGRAM_MATERIAL_NORMAL_TEXTURE=!0,t.defines["TANGRAM_MATERIAL_NORMAL_TEXTURE_"+this.normal.mapping.toUpperCase()]=!0,t.defines["TANGRAM_MATERIAL_TEXTURE_"+this.normal.mapping.toUpperCase()]=!0,t.texcoords=t.texcoords||"uv"===this.normal.mapping),t.replaceShaderBlock(e.block,l,"Material"),t.addShaderBlock("setup","\nmaterial = u_material;\n","Material")}},{key:"setupProgram",value:function(e){var t=this;c.forEach(function(r){t[r]&&(t[r].texture?(e.setTextureUniform("u_material_"+r+"_texture",t[r].texture),e.uniform("3fv","u_material."+r+"Scale",t[r].scale),e.uniform("4fv","u_material."+r,t[r].amount)):t[r].amount&&e.uniform("4fv","u_material."+r,t[r].amount))}),this.specular&&e.uniform("1f","u_material.shininess",this.specular.shininess),this.normal&&this.normal.texture&&(e.setTextureUniform("u_material_normal_texture",this.normal.texture),e.uniform("3fv","u_material.normalScale",this.normal.scale),e.uniform("1f","u_material.normalAmount",this.normal.amount))}}],[{key:"isValid",value:function(e){return null==e?!1:null==e.emission&&null==e.ambient&&null==e.diffuse&&null==e.specular?!1:!0}}]),e}();r.default=f,f.block="material"},{"./gl/glsl":207,"./styles/style_parser":247}],227:[function(e,t){"use strict";function r(e){return e&&e.__esModule?e:{"default":e}}e("./utils/polyfills");var n=e("./leaflet_layer"),i=e("./scene"),o=r(i),a=e("./scene_worker"),s=e("./utils/version"),u=r(s),l=e("./utils/log"),c=r(l),f=e("./utils/thread"),h=r(f),d=e("./utils/utils"),p=r(d),_=e("./geo"),m=r(_),g=e("./vector"),v=r(g),y=e("./sources/data_source"),b=r(y);e("./sources/geojson"),e("./sources/topojson"),e("./sources/mvt"),e("./sources/raster");var x=e("./gl/glsl"),w=r(x),k=e("./gl/shader_program"),A=r(k),T=e("./gl/vertex_data"),E=r(T),S=e("./gl/texture"),R=r(S),M=e("./material"),O=r(M),P=e("./light"),z=r(P),L=e("./utils/worker_broker"),N=r(L),j=e("./styles/layer"),I=e("./styles/style_manager"),C=e("./styles/style_parser"),F=e("./labels/collision"),U=r(F),D=e("./selection"),B=r(D),G=e("./styles/text/canvas_text"),V=r(G),q=e("./utils/debug_settings"),W=r(q),Z=e("js-yaml"),H=r(Z),X=e("jszip"),Y=r(X),J={log:c.default,yaml:H.default,Thread:h.default,Utils:p.default,Geo:m.default,Vector:v.default,DataSource:b.default,GLSL:w.default,ShaderProgram:A.default,VertexData:E.default,Texture:R.default,Material:O.default,Light:z.default,Scene:o.default,SceneWorker:a.SceneWorker,WorkerBroker:N.default,layer_cache:j.layer_cache,StyleManager:I.StyleManager,StyleParser:C.StyleParser,Collision:U.default,FeatureSelection:B.default,CanvasText:V.default,debugSettings:W.default};h.default.is_main&&(p.default.requestAnimationFramePolyfill(),void 0===window.Promise&&(window.Promise=Promise,Y.default.external.Promise=Promise)),t.exports={leafletLayer:n.leafletLayer,debug:J,version:u.default}},{"./geo":203,"./gl/glsl":207,"./gl/shader_program":209,"./gl/texture":210,"./gl/vertex_data":213,"./labels/collision":216,"./leaflet_layer":224,"./light":225,"./material":226,"./scene":228,"./scene_worker":231,"./selection":232,"./sources/data_source":233,"./sources/geojson":234,"./sources/mvt":235,"./sources/raster":236,"./sources/topojson":237,"./styles/layer":239,"./styles/style_manager":246,"./styles/style_parser":247,"./styles/text/canvas_text":248,"./utils/debug_settings":257,"./utils/log":261,"./utils/polyfills":265,"./utils/thread":267,"./utils/utils":269,"./utils/version":270,"./utils/worker_broker":271,"./vector":272,"js-yaml":97,jszip:133}],228:[function(e,n,i){"use strict";function o(e){if(e&&e.__esModule)return e;var t={};if(null!=e)for(var r in e)Object.prototype.hasOwnProperty.call(e,r)&&(t[r]=e[r]);return t.default=e,t}function a(e){return e&&e.__esModule?e:{"default":e}}function s(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function u(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(i,"__esModule",{value:!0});var l="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},c=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),f=e("./utils/log"),h=a(f),d=e("./utils/utils"),p=a(d),_=e("./utils/urls"),m=o(_),g=e("./utils/worker_broker"),v=a(g),y=e("./utils/subscribe"),b=a(y),x=e("./gl/context"),w=a(x),k=e("./gl/texture"),A=a(k),T=e("./gl/shader_program"),E=a(T),S=e("./gl/vao"),R=a(S),M=e("./styles/style_manager"),O=e("./styles/style"),P=e("./styles/style_parser"),z=e("./scene_loader"),L=a(z),N=e("./view"),j=a(N),I=e("./light"),C=a(I),F=e("./tile_manager"),U=a(F),D=e("./sources/data_source"),B=a(D),G=e("./selection"),V=a(G),q=e("./gl/render_state"),W=a(q),Z=e("./styles/text/font_manager"),H=a(Z),X=e("./utils/media_capture"),Y=a(X),J=function(){function e(t,r){u(this,e),r=r||{},b.default(this),this.id=e.id++,this.initialized=!1,this.initializing=null,this.sources={},this.view=new j.default(this,r),this.tile_manager=new U.default({scene:this,view:this.view}),this.num_workers=r.numWorkers||2,r.disableVertexArrayObjects===!0&&(R.default.disabled=!0),p.default.use_high_density_display=void 0!==r.highDensityDisplay?r.highDensityDisplay:!0,p.default.updateDevicePixelRatio(),this.config=null,this.config_source=t,this.config_bundle=null,this.last_valid_config_source=null,this.styles=null,this.style_manager=new M.StyleManager,this.building=null,this.dirty=!0,this.animated=!1,this.preUpdate=r.preUpdate,this.postUpdate=r.postUpdate,this.render_loop=!r.disableRenderLoop,this.render_loop_active=!1,this.render_loop_stop=!1,this.render_count=0,this.last_render_count=0,this.render_count_changed=!1,this.frame=0,this.last_main_render=-1,this.last_selection_render=-1,this.media_capture=new Y.default,this.selection=null,this.introspection=!1,this.resetTime(),this.container=r.container,this.lights=null,this.background=null,this.createListeners(),this.updating=0,this.generation=e.generation,this.last_complete_generation=e.generation,this.setupDebug(),this.log_level=r.logLevel||"warn",h.default.setLevel(this.log_level),h.default.reset()}return c(e,[{key:"load",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:null,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};if(this.initializing)return this.initializing;h.default.reset(),this.updating++,this.initialized=!1,r="string"==typeof r?{config_path:r}:r;var n=r.config_path;return r.blocking=void 0!==r.blocking?r.blocking:!0,this.createCanvas(),this.initializing=this.loadScene(t,n).then(function(){return e.createWorkers()}).then(function(){e.resetFeatureSelection();var t="object"===l(e.config_source)||e.hasSubscribersFor("load"),n=e.updateConfig({serialize_funcs:t,load_event:!0,fade_in:!0});return r.blocking===!0?n:void 0}).then(function(){e.updating--,e.initializing=null,e.initialized=!0,e.last_valid_config_source=e.config_source,e.last_valid_config_path=e.config_path,e.render_loop!==!1&&e.setupRenderLoop(),e.requestRedraw()}).catch(function(t){e.initializing=null,e.updating=0;var r=void 0,n=void 0;if("YAMLException"===t.name?(r="yaml",n="Error parsing scene YAML"):n="Error initializing scene",e.trigger("error",{type:r,message:n,error:t,url:e.config_source}),n="Scene.load() failed to load "+e.config_source+": "+t.message,e.last_valid_config_source)return h.default("warn",n,t),h.default("info","Scene.load() reverting to last valid configuration"),e.load(e.last_valid_config_source,e.last_valid_config_path);throw h.default("error",n,t),t}),this.initializing}},{key:"destroy",value:function(){if(this.initialized=!1,this.render_loop_stop=!0,this.destroyListeners(),this.canvas&&this.canvas.parentNode&&(this.canvas.parentNode.removeChild(this.canvas),this.canvas=null),this.container=null,this.selection&&this.selection.destroy(),this.gl){A.default.destroy(this.gl),this.style_manager.destroy(this.gl),this.styles={},E.default.reset();var e=this.gl.getExtension("WEBGL_lose_context");e&&e.loseContext(),this.gl=null}this.sources={},this.destroyWorkers(),this.tile_manager.destroy(),this.tile_manager=null,h.default.reset()}},{key:"createCanvas",value:function(){if(!this.canvas){this.container=this.container||document.body,this.canvas=document.createElement("canvas"),this.canvas.style.position="absolute",this.canvas.style.top=0,this.canvas.style.left=0,this.container.style.backgroundColor="transparent",this.container.appendChild(this.canvas);try{this.gl=w.default.getContext(this.canvas,{alpha:!0,premultipliedAlpha:!0,device_pixel_ratio:p.default.device_pixel_ratio})}catch(e){throw new Error("Couldn't create WebGL context. Your browser may not support WebGL, or it's turned off? Visit http://webglreport.com/ for more info.")}this.resizeMap(this.container.clientWidth,this.container.clientHeight),R.default.init(this.gl),this.render_states=new W.default(this.gl),this.media_capture.setCanvas(this.canvas)}}},{key:"getWorkerUrl",value:function(){var e=void 0;if("undefined"!=typeof t){var n="\n//# sourceMappingURL="+r+".map";e=m.createObjectURL(new Blob(["("+t+")()"+n],{type:"application/javascript"}))}if(!e)throw new Error("Couldn't find internal Tangram source variable (may indicate the library did not build correctly)");var i=[].concat(s(this.data_source_scripts));i.push(e);var o="importScripts("+i.map(function(e){return"'"+e+"'"}).join(",")+");";return m.createObjectURL(new Blob([o],{type:"application/javascript"}))}},{key:"updateDataSourceScripts",value:function(){var e,t=this,r=[].concat(s(this.data_source_scripts||[])),n=Object.keys(this.config.sources).map(function(e){return t.config.sources[e].scripts}).filter(function(e){return e});return n.length>0&&h.default("debug","loading custom data source scripts in worker:",n),this.data_source_scripts=(e=[]).concat.apply(e,s(n)).sort(),!(this.data_source_scripts.length===r.length&&this.data_source_scripts.every(function(e,t){return e===r[t]}))}},{key:"createWorkers",value:function(){return this.updateDataSourceScripts()&&this.destroyWorkers(),this.workers?Promise.resolve():this.makeWorkers(this.getWorkerUrl())}},{key:"makeWorkers",value:function(e){var t=this,r=[];this.workers=[];for(var n=function(){o=new Worker(e),t.workers[i]=o,v.default.addWorker(o),h.default("debug","Scene.makeWorkers: initializing worker "+i);var n=i;r.push(v.default.postMessage(o,"self.init",t.id,i,t.num_workers,t.log_level,p.default.device_pixel_ratio).then(function(e){return h.default("debug","Scene.makeWorkers: initialized worker "+e),e},function(e){return h.default("error","Scene.makeWorkers: failed to initialize worker "+n+":",e),Promise.reject(e)}))},i=0;i<this.num_workers;i++){var o;n()}return this.next_worker=0,Promise.all(r).then(function(){h.default.setWorkers(t.workers);var r=t.gl.getExtension("OES_element_index_uint")?!0:!1;v.default.postMessage(t.workers,"VertexElements.setUint32Flag",r),m.revokeObjectURL(e)})}},{key:"destroyWorkers",value:function(){Array.isArray(this.workers)&&(h.default.setWorkers(null),this.workers.forEach(function(e){e.terminate()}),this.workers=null)}},{key:"getWorkerForDataSource",value:function(e){var t=void 0;return e.tiled?(t=this.workers[this.next_worker],this.next_worker=(this.next_worker+1)%this.workers.length):t=this.workers[e.id%this.workers.length],t}},{key:"ready",value:function(){return this.view.ready()&&0!==Object.keys(this.sources).length?!0:!1}},{key:"updateDevicePixelRatio",value:function(){var e=this;p.default.updateDevicePixelRatio()&&v.default.postMessage(this.workers,"self.updateDevicePixelRatio",p.default.device_pixel_ratio).then(function(){return e.rebuild()}).then(function(){return e.resizeMap(e.view.size.css.width,e.view.size.css.height)})}},{key:"resizeMap",value:function(e,t){(0!==e||0!==t)&&(this.dirty=!0,this.view.setViewportSize(e,t),this.gl&&w.default.resize(this.gl,e,t,p.default.device_pixel_ratio))}},{key:"requestRedraw",value:function(){this.dirty=!0}},{key:"immediateRedraw",value:function(){this.dirty=!0,this.update()}},{key:"renderLoop",value:function(){this.render_loop_active=!0,this.initialized&&this.update(),this.render_loop_stop?(this.render_loop_stop=!1,this.render_loop_active=!1):window.requestAnimationFrame(this.renderLoop.bind(this))}},{key:"setupRenderLoop",value:function(){var e=this;this.render_loop_active||setTimeout(function(){e.renderLoop()},0)}},{key:"update",value:function(){var e=this.dirty,t=this.selection?this.selection.hasPendingRequests():!1,r=!(e===!1&&t===!1||this.initialized===!1||this.updating>0||this.ready()===!1);return"function"==typeof this.preUpdate&&this.preUpdate(r),r?(this.dirty=!1,this.updateDevicePixelRatio(),this.render({main:e,selection:t}),this.updateViewComplete(),this.media_capture.completeScreenshot(),"function"==typeof this.postUpdate&&this.postUpdate(r),(this.animated===!0||this.view.isAnimating())&&(this.dirty=!0),this.frame++,h.default("trace","Scene.render()"),!0):!1}},{key:"render",value:function(e){var t=this,r=e.main,n=e.selection,i=this.gl;if(this.view.update(),Object.keys(this.lights).forEach(function(e){return t.lights[e].update()}),r&&(this.render_count=this.renderPass(),this.last_main_render=this.frame),n){if(this.view.panning||this.view.zooming)return void this.selection.clearPendingRequests();!this.selection.locked&&this.last_selection_render<this.last_main_render&&(this.selection.bind(),this.renderPass("selection_program",{allow_blend:!1}),i.bindFramebuffer(i.FRAMEBUFFER,null),i.viewport(0,0,this.canvas.width,this.canvas.height),this.last_selection_render=this.frame),this.selection.read()}return this.render_count_changed=!1,this.render_count!==this.last_render_count&&(this.render_count_changed=!0,this.getFeatureSelectionMapSize().then(function(e){e&&h.default("info","Scene: rendered "+t.render_count+" primitives ("+e+" features in selection map)")})),this.last_render_count=this.render_count,!0}},{key:"renderPass",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"program",r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=r.allow_blend;n=null==n?!0:n,this.clearFrame({clear_color:!0,clear_depth:!0});for(var i=this.tile_manager.getActiveStyles().map(function(t){return e.styles[t]}).filter(function(e){return e}).sort(O.Style.blendOrderSort),o=0,a=void 0,s=0;s<i.length;s++){var u=i[s];if(u.blend!==a){var l=Object.assign({},O.Style.render_states[u.blend],{blend:n&&u.blend});this.setRenderState(l)}o+=this.renderStyle(u.name,t),a=u.blend}return o}},{key:"renderStyle",value:function(e,t){for(var r=this.styles[e],n=!0,i=0,o=void 0,a=this.tile_manager.getRenderableTiles(),s=0;s<a.length;s++){var u=a[s];if(null!=u.meshes[e]){if(n===!0&&(n=!1,o=this.setupStyle(r,t),!o))return 0;if(u.shouldProxyForStyle(e)){this.view.setupTile(u,o);var l=u.meshes[e];r.render(l)&&(this.view.panning||this.view.zooming||this.requestRedraw()),i+=l.geometry_count}}}return i}},{key:"setupStyle",value:function(e,t){var r=void 0;try{if(r=e.getProgram(t),!r)return}catch(n){return void this.trigger("warning",{type:"styles",message:"Error compiling style "+e.name,style:e,shader_errors:e.program&&e.program.shader_errors})}r.use(),e.setup(),r.uniform("1f","u_time",this.animated?(+new Date-this.start_time)/1e3:0),this.view.setupProgram(r);for(var i in this.lights)this.lights[i].setupProgram(r);return r}},{key:"clearFrame",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.clear_color,r=e.clear_depth;if(this.initialized){t=t===!1?!1:!0,r=r===!1?!1:!0,this.render_states.depth_write.set({depth_write:r});var n=this.gl;if(t||r){var i=(t&&n.COLOR_BUFFER_BIT)|(r&&n.DEPTH_BUFFER_BIT);n.clear(i)}}}},{key:"setRenderState",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.depth_test,r=e.depth_write,n=e.cull_face,i=e.blend;if(this.initialized){var o=this.render_states;t=t===!1?!1:o.defaults.depth_test,r=r===!1?!1:o.defaults.depth_write,n=n===!1?!1:o.defaults.culling,i=null!=i?i:o.defaults.blending;var a=this.gl;o.depth_test.set({depth_test:t}),o.depth_write.set({depth_write:r}),o.culling.set({cull:n,face:o.defaults.culling_face}),i?"opaque"===i?o.blending.set({blend:!1}):"overlay"===i||"inlay"===i?o.blending.set({blend:!0,src:a.SRC_ALPHA,dst:a.ONE_MINUS_SRC_ALPHA,src_alpha:a.ONE,dst_alpha:a.ONE_MINUS_SRC_ALPHA}):"add"===i?o.blending.set({blend:!0,src:a.ONE,dst:a.ONE}):"multiply"===i&&o.blending.set({blend:!0,src:a.ZERO,dst:a.SRC_COLOR}):o.blending.set({blend:!1})}}},{key:"getFeatureAt",value:function(e){if(!this.initialized)return h.default("debug","Scene.getFeatureAt() called before scene was initialized"),Promise.resolve();var t={x:e.x*p.default.device_pixel_ratio/this.view.size.device.width,y:e.y*p.default.device_pixel_ratio/this.view.size.device.height};return this.selection.getFeatureAt(t).then(function(t){return Object.assign(t,{pixel:e})}).catch(function(e){return Promise.resolve({error:e})})}},{key:"rebuild",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},r=t.sync,n=void 0===r?!0:r,i=t.sources,o=void 0===i?null:i,a=t.serialize_funcs,s=t.profile,u=void 0===s?!1:s,l=t.fade_in,c=void 0===l?!1:l;return new Promise(function(t,r){if(e.building){e.building.queued&&e.building.queued.reject&&(h.default("debug","Scene.rebuild: request superceded by a newer call"),e.building.queued.resolve(!1));var i={sync:n,sources:o,serialize_funcs:a,profile:u,fade_in:c};return e.building.queued={resolve:t,reject:r,options:i},void h.default("trace","Scene.rebuild(): queuing request")}e.building={resolve:t,reject:r},u&&e._profile("Scene.rebuild"),n&&e.syncConfigToWorker({serialize_funcs:a}),e.resetFeatureSelection(),e.resetTime(),e.tile_manager.pruneToVisibleTiles(),e.tile_manager.forEachTile(function(t){(!o||o.indexOf(t.source.name)>-1)&&e.tile_manager.buildTile(t,{fade_in:c})}),e.tile_manager.updateTilesForView(),e.tile_manager.checkBuildQueue()}).then(function(){u&&e._profileEnd("Scene.rebuild")})}},{key:"tileManagerBuildDone",value:function(){if(this.building){h.default("info","Scene: build geometry finished"),this.building.resolve&&this.building.resolve(!0);var e=this.building.queued;this.building=null,e&&(h.default("debug","Scene: starting queued rebuild() request"),this.rebuild(e.options).then(e.resolve,e.reject))}}},{key:"loadScene",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:null,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null;return this.config_source=t||this.config_source,this.config_globals_applied=[],this.config_path=m.pathForURL("string"==typeof this.config_source?r||this.config_source:r),L.default.loadScene(this.config_source,this.config_path).then(function(t){var r=t.config,n=t.bundle;return e.config=r,e.config_bundle=n,e.config})}},{key:"setDataSource",value:function(e,t){if(!e||!t||!t.type||!t.url&&!t.data)return void h.default("error","No name provided or not a valid config:",e,t);var r=null==this.config.sources[e],n=this.config.sources[e]=Object.assign({},t);return n.data&&"object"===l(n.data)&&(n.url=m.createObjectURL(new Blob([JSON.stringify(n.data)])),delete n.data),L.default.normalizeDataSource(n,this.config_bundle),r?this.updateConfig({rebuild:{sources:[e]}}):this.rebuild({sources:[e]})}},{key:"createDataSources",value:function(){var e=this,t=[],r=Object.keys(this.sources),n=0;for(var i in this.config.sources){var o=this.config.sources[i],a=this.sources[i];try{var s=Object.assign({},o,{name:i,id:n++});if(this.sources[i]=B.default.create(s,this.sources),!this.sources[i])throw{}}catch(u){delete this.sources[i];var l="Could not create data source: "+u.message;h.default("warn","Scene: "+l,o),this.trigger("warning",{type:"sources",source:o,message:l})}B.default.changed(this.sources[i],a)&&t.push(i)}r.forEach(function(r){e.config.sources[r]||(delete e.sources[r],t.push(r))}),t.length>0&&this.tile_manager.removeTiles(function(e){return t.indexOf(e.source.name)>-1});for(var c in this.config.layers){var f=this.config.layers[c];f.data&&this.sources[f.data.source]&&(this.sources[f.data.source].builds_geometry_tiles=!0)}}},{key:"loadTextures",value:function(){var e=this;return A.default.createFromObject(this.gl,this.config.textures).then(function(){return A.default.createDefault(e.gl)})}},{key:"updateStyles",value:function(){var e=this;if(!this.initialized&&!this.initializing)throw new Error("Scene.updateStyles() called before scene was initialized");this.styles=this.style_manager.build(this.config.styles),this.style_manager.initStyles(this);for(var t in this.styles)this.styles[t].setGL(this.gl);this.animated=void 0!==this.config.scene.animated?this.config.scene.animated:Object.keys(this.styles).some(function(t){return e.styles[t].animated}),this.dirty=!0}},{key:"getActiveCamera",value:function(){return this.view.getActiveCamera()}},{key:"setActiveCamera",value:function(e){return this.view.setActiveCamera(e)}},{key:"createLights",value:function(){this.lights={};for(var e in this.config.lights)if(this.config.lights[e]&&"object"===l(this.config.lights[e])){var t=this.config.lights[e];t.name=e.replace("-","_"),t.visible=t.visible===!1?!1:!0,t.visible&&(this.lights[t.name]=C.default.create(this.view,t))}C.default.inject(this.lights)}},{key:"setBackground",value:function(){var e,t=this.config.scene.background;this.background={},t&&t.color&&(this.background.color=P.StyleParser.parseColor(t.color)),this.background.color||(this.background.color=[0,0,0,0]),this.canvas.style.backgroundColor=1===this.background.color[3]?"rgba("+this.background.color.map(function(e){return Math.floor(255*e)}).join(", ")+")":"transparent",(e=this.gl).clearColor.apply(e,s(this.background.color))}},{key:"setIntrospection",value:function(e){var t=this;return this.introspection=e||!1,this.updating++,this.updateConfig().then(function(){return t.updating--})}},{key:"updateConfig",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},r=t.load_event,n=void 0===r?!1:r,i=t.rebuild,o=void 0===i?!0:i,a=t.serialize_funcs,s=t.fade_in,u=void 0===s?!1:s;this.generation=++e.generation,this.updating++,this.config=L.default.applyGlobalProperties(this.config,this.config_globals_applied),this.trigger(n?"load":"update",{config:this.config}),L.default.hoistTextures(this.config),this.style_manager.init(),this.view.reset(),this.createLights(),this.createDataSources(),this.loadTextures(),this.setBackground(),H.default.loadFonts(this.config.fonts),this.updateStyles();var c=o?this.rebuild(Object.assign({serialize_funcs:a,fade_in:u},"object"===("undefined"==typeof o?"undefined":l(o))&&o)):this.syncConfigToWorker({serialize_funcs:a});return this.updating--,this.view.updateBounds(),this.requestRedraw(),c}},{key:"syncConfigToWorker",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.serialize_funcs,r=void 0===t?!0:t,n=r?p.default.serializeWithFunctions(this.config):JSON.stringify(this.config);return v.default.postMessage(this.workers,"self.updateConfig",{config:n,generation:this.generation,introspection:this.introspection})}},{key:"createListeners",value:function(){var e=this;this.listeners={},this.listeners.view={move:function(){return e.trigger("move")}},this.view.subscribe(this.listeners.view),this.listeners.texture={update:function(){return e.dirty=!0},warning:function(t){return e.trigger("warning",Object.assign({type:"textures"},t))}},A.default.subscribe(this.listeners.texture),this.listeners.scene_loader={error:function(t){return e.trigger("error",Object.assign({type:"scene"},t))}},L.default.subscribe(this.listeners.scene_loader)}},{key:"destroyListeners",value:function(){this.unsubscribeAll(),this.view.unsubscribe(this.listeners.view),A.default.unsubscribe(this.listeners.texture),L.default.unsubscribe(this.listeners.scene_loader),this.listeners=null}},{key:"resetFeatureSelection",value:function(){var e=this;this.selection?this.workers&&v.default.postMessage(this.workers,"self.resetFeatureSelection"):this.selection=new V.default(this.gl,this.workers,function(){return e.building})}},{key:"getFeatureSelectionMapSize",value:function(){var e=this;return this.fetching_selection_map?Promise.resolve():(this.fetching_selection_map=!0,v.default.postMessage(this.workers,"self.getFeatureSelectionMapSize").then(function(t){return e.fetching_selection_map=!1,t.reduce(function(e,t){return e+t})}))}},{key:"resetTime",value:function(){this.start_time=+new Date}},{key:"updateViewComplete",value:function(){!this.render_count_changed&&this.generation===this.last_complete_generation||this.tile_manager.isLoadingVisibleTiles()||(this.last_complete_generation=this.generation,this.trigger("view_complete"))}},{key:"resetViewComplete",value:function(){this.last_complete_generation=null}},{key:"screenshot",value:function(){return this.requestRedraw(),this.media_capture.screenshot()}},{key:"startVideoCapture",value:function(){return this.requestRedraw(),this.media_capture.startVideoCapture()}},{key:"stopVideoCapture",value:function(){return this.media_capture.stopVideoCapture()}},{key:"_profile",value:function(e){console.profile("main thread: "+e),v.default.postMessage(this.workers,"self.profile",e)}},{key:"_profileEnd",value:function(e){console.profileEnd("main thread: "+e),v.default.postMessage(this.workers,"self.profileEnd",e)}},{key:"setupDebug",value:function(){var e=this;this.debug={timeRebuild:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:1,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=[],i=function o(){var i=+new Date;e.rebuild(r).then(function(){if(n.push(+new Date-i),n.length<t)o();else{var e=~~(n.reduce(function(e,t){return e+t})/n.length);h.default("info","Profiled rebuild "+t+" times: "+e+" avg ("+Math.min.apply(Math,n)+" min, "+Math.max.apply(Math,n)+" max)")}})};i()},geometryCountByStyle:function(){var t={};return e.tile_manager.getRenderableTiles().forEach(function(e){for(var r in e.meshes)t[r]=t[r]||0,t[r]+=e.meshes[r].geometry_count}),t},geometryCountByBaseStyle:function(){var t=e.debug.geometryCountByStyle(),r={};for(var n in t){var i=e.styles[n].baseStyle();r[i]=r[i]||0,r[i]+=t[n]}return r},renderableTilesCount:function(){return e.tile_manager.getRenderableTiles().length}}}}],[{key:"create",value:function(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};return new 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i=e.pixel[0]+(e.pixel[1]<<8)+(e.pixel[2]<<16)+(e.pixel[3]<<24)>>>0,o=e.pixel[3];255!==o?null!=e.workers[o]&&f.default.postMessage(e.workers[o],"self.getFeatureSelection",{id:n.id,key:i}).then(function(t){e.finishRead(t)}):e.finishRead({id:n.id}),n.sent=!0}}t.bindFramebuffer(t.FRAMEBUFFER,null)}},this.read_delay)}},{key:"finishRead",value:function(e){var t=this.requests[e.id];if(!t)return void s.default("error","FeatureSelection.finishRead(): could not find message",e);var r=e.feature,n=!1;(null!=r&&null==this.feature||null==r&&null!=this.feature||null!=r&&null!=this.feature&&JSON.stringify(r)!==JSON.stringify(this.feature))&&(n=!0),this.feature=r,t.resolve({feature:r,changed:n,request:t}),delete this.requests[e.id]}},{key:"locked",get:function(){return this._lock_fn&&this._lock_fn()||!1}}],[{key:"makeEntry",value:function(e){this.map_entry++;var t=255&this.map_entry,r=this.map_entry>>8&255,n=this.map_entry>>16&255,i=this.map_prefix,o=t/255,a=r/255,s=n/255,u=i/255,l=t+(r<<8)+(n<<16)+(i<<24)>>>0;return this.map[l]={color:[o,a,s,u]},this.map_size++,this.tiles[e.key]||(this.tiles[e.key]={entries:[],tile:{key:e.key,coords:e.coords,style_zoom:e.style_zoom,source:e.source,generation:e.generation}}),this.tiles[e.key].entries.push(l),this.map[l]}},{key:"makeColor",value:function(e,t,r){var n=this.makeEntry(t);return n.feature={id:e.id,properties:e.properties,source_name:r.source,source_layer:r.layer,layers:r.layers,tile:this.tiles[t.key].tile},n.color}},{key:"reset",value:function(){this.tiles={},this.map={},this.map_size=0,this.map_entry=0}},{key:"clearTile",value:function(e){var t=this;this.tiles[e]&&(this.tiles[e].entries.forEach(function(e){return delete t.map[e]}),this.map_size-=this.tiles[e].entries.length,delete this.tiles[e])}},{key:"getMapSize",value:function(){return 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p.MethodNotImplemented("_load")}},{key:"updateDefaultWinding",value:function(e){return null==this.default_winding&&("Polygon"===e.type?this.default_winding=d.default.ringWinding(e.coordinates[0]):"MultiPolygon"===e.type&&(this.default_winding=d.default.ringWinding(e.coordinates[0][0]))),this.default_winding}},{key:"includesTile",value:function(e,t){if(e.z<this.min_display_zoom||null!=this.max_display_zoom&&t>this.max_display_zoom)return!1;for(var r=0;r<this.rasters.length;r++){var n=this.rasters[r];if(this.sources[n]&&this.sources[n]!==this&&!this.sources[n].includesTile(e,e.z))return!1}return!0}}],[{key:"create",value:function(t,r){return e.types[t.type]?new e.types[t.type](t,r):void 0}},{key:"changed",value:function(e,t){if(!e||!t)return!0;var r=Object.assign({},e.config,{id:null}),n=Object.assign({},t.config,{id:null});return JSON.stringify(r)!==JSON.stringify(n)}},{key:"projectData",value:function(e){var t=+new Date;for(var r in e.layers)for(var n=e.layers[r].features.length,i=0;n>i;i++){var o=e.layers[r].features[i];d.default.transformGeometry(o.geometry,function(e){var t=d.default.latLngToMeters(e),r=c(t,2),n=r[0],i=r[1];e[0]=n,e[1]=i})}void 0!==e.debug&&(e.debug.projection=+new Date-t)}},{key:"scaleData",value:function(e,t){var r=t.coords.z,n=t.min,i=(t.max,d.default.unitsPerMeter(r));for(var o in e.layers)for(var a=e.layers[o].features.length,s=0;a>s;s++){var u=e.layers[o].features[s];d.default.transformGeometry(u.geometry,function(e){e[0]=(e[0]-n.x)*i,e[1]=(e[1]-n.y)*i*-1})}}},{key:"register",value:function(t,r){t&&r&&(e.types[r]=t)}}]),e}();r.default=x,x.types={};{var w=0,k=r.NetworkSource=function(e){function t(e,r){u(this,t);var n=o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));n.response_type="";var i=v.addParamsToURL(e.url,e.url_params),a=c(i,2),s=a[0],l=a[1];if(n.url=s,l.forEach(function(t){var r=c(t,2),i=r[0],o=r[1];b.default({level:"warn",once:!0},"Data source '"+n.name+"': parameter '"+i+"' already present in URL '"+e.url+"', "+("skipping value '"+i+"="+o+"' specified in 'url_params'"))}),"string"!=typeof n.url)throw Error("Network data source must provide a string `url` property");return n}return a(t,e),f(t,[{key:"_load",value:function(e){var t=this,r=this.formatUrl(this.url,e),n=e.source_data;return n.url=r,e.debug=e.debug||{},e.debug.network=+new Date,new Promise(function(i){n.error=null;var o=w++ +"-"+r,a=m.default.io(r,6e4,t.response_type,"GET",{},o);n.request_id=o,a.then(function(r){e.debug.response_size=r.length||r.byteLength,e.debug.network=+new Date-e.debug.network,e.debug.parsing=+new Date,t.parseSourceData(e,n,r),e.debug.parsing=+new Date-e.debug.parsing,i(e)}).catch(function(t){n.error=t.stack,i(e)})})}},{key:"formatUrl",value:function(){throw new p.MethodNotImplemented("formatUrl")}},{key:"parseSourceData",value:function(){throw new p.MethodNotImplemented("parseSourceData")}}]),t}(x);r.NetworkTileSource=function(e){function t(e,r){u(this,t);var n=o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.tiled=!0,n.parseBounds(e),n.builds_geometry_tiles=!1,n.tms=e.tms===!0,n.url.search("{s}")>-1&&(Array.isArray(e.url_subdomains)&&e.url_subdomains.length>0?(n.url_subdomains=e.url_subdomains,n.next_url_subdomain=0):b.default({level:"warn",once:!0},"Data source '"+n.name+"': source URL includes '{s}' subdomain marker ('"+n.url+"'), but no subdomains were specified in 'url_subdomains' parameter")),n}return a(t,e),f(t,[{key:"parseBounds",value:function(e){if(Array.isArray(e.bounds)&&4===e.bounds.length){this.bounds=e.bounds;var t=c(this.bounds,4),r=t[0],n=t[1],i=t[2],o=t[3];this.bounds_meters={min:d.default.latLngToMeters([r,o]),max:d.default.latLngToMeters([i,n])},this.bounds_tiles={min:{},max:{}}}}},{key:"checkBounds",value:function(e){if(this.bounds){e=d.default.wrapTile(e,{x:!0});var t=this.bounds_tiles.min[e.z];t||(t=this.bounds_tiles.min[e.z]=d.default.tileForMeters(this.bounds_meters.min,e.z));var r=this.bounds_tiles.max[e.z];if(r||(r=this.bounds_tiles.max[e.z]=d.default.tileForMeters(this.bounds_meters.max,e.z)),e.x<t.x||e.x>r.x||e.y<t.y||e.y>r.y)return!1}return!0}},{key:"includesTile",value:function(e,r){return l(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"includesTile",this).call(this,e,r)&&this.checkBounds(e)?!0:!1}},{key:"formatUrl",value:function(e,t){var r=d.default.wrapTile(t.coords,{x:!0});this.tms&&(r.y=Math.pow(2,r.z)-1-r.y);var n=e.replace("{x}",r.x).replace("{y}",r.y).replace("{z}",r.z);return null!=this.url_subdomains&&(n=n.replace("{s}",this.url_subdomains[this.next_url_subdomain]),this.next_url_subdomain=(this.next_url_subdomain+1)%this.url_subdomains.length),n}},{key:"urlHasTilePattern",value:function(e){return e&&e.search("{x}")>-1&&e.search("{y}")>-1&&e.search("{z}")>-1}}]),t}(k)}},{"../geo":203,"../utils/errors":258,"../utils/log":261,"../utils/urls":268,"../utils/utils":269}],234:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function a(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function s(e,t,r){var n=m.default.centroid(e);if(n){var i={};return Object.assign(i,t,r),{type:"Feature",properties:i,geometry:{type:"Point",coordinates:n}}}}Object.defineProperty(r,"__esModule",{value:!0}),r.GeoJSONTileSource=r.GeoJSONSource=void 0;var u=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in 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if(s.geometry=p.decodeMultiPolygon(s.geometry),null==s.geometry)continue}i.features.push(s)}}return i}},{key:"formatUrl",value:function(){return this.url}},{key:"parseSourceData",value:function(e,t,r){var n=JSON.parse(r),i=this.getLayers(n);t.layers=this.preprocessLayers(i)}},{key:"preprocessLayers",value:function(e){for(var t in e){var r=e[t];this.preprocessFeatures(r.features)}return"function"==typeof this.transform&&(1===Object.keys(e).length&&e._default?e._default=this.transform(e._default,this.extra_data):e=this.transform(e,this.extra_data)),e}},{key:"preprocessFeatures",value:function(e){if(this.config.generate_label_centroids){var t=[],r={label_placement:!0};e.forEach(function(e){if(null!=e.geometry){var n=void 0,i=void 0;switch(e.geometry.type){case"Polygon":n=e.geometry.coordinates,i=s(n,e.properties,r),t.push(i);break;case"MultiPolygon":n=e.geometry.coordinates;for(var o=-1/0,a=0,u=0;u<n.length;u++){var 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n={coords:t.coords,min:m.default.metersForTile(m.default.wrapTile(t.coords,{x:!0}))};d.default.projectData(r),d.default.scaleData(r,n)}}]),t}(h.NetworkTileSource);d.default.register(b,"GeoJSON")},{"../geo":203,"../utils/log":261,"./data_source":233,"./mvt":235,"geojson-vt":82}],235:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function a(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function s(e){for(var t=[],r=[],n=void 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e=[{name:"a_position",size:4,type:s.default.SHORT,normalized:!1},{name:"a_extrude",size:4,type:s.default.SHORT,normalized:!1},{name:"a_color",size:4,type:s.default.UNSIGNED_BYTE,normalized:!0}];this.defines.TANGRAM_LAYER_ORDER=!0,this.defines.TANGRAM_EXTRUDE_LINES=!0,this.selection&&e.push({name:"a_selection_color",size:4,type:s.default.UNSIGNED_BYTE,normalized:!0}),(this.texture||this.dash)&&(this.texcoords=!0),this.texcoords&&(this.defines.TANGRAM_TEXTURE_COORDS=!0,this.defines.TANGRAM_DASH_SCALE=1,this.defines.TANGRAM_V_SCALE_ADJUST=m.default.tile_scale*this.defines.TANGRAM_DASH_SCALE,e.push({name:"a_texcoord",size:2,type:s.default.UNSIGNED_SHORT,normalized:!0})),this.vertex_layout=new f.default(e),this.outline_feature_style={},this.inline_feature_style=this.feature_style},compileSetup:function(){return this.compile_setup||this.parseLineTexture(),i.Style.compileSetup.apply(this,arguments)},parseLineTexture:function(){var e=this;if(this.dash){this.dash_background_color&&(this.dash_background_color=o.StyleParser.parseColor(this.dash_background_color),this.defines.TANGRAM_LINE_BACKGROUND_COLOR="vec3("+this.dash_background_color.slice(0,3).join(", ")+")"),this.defines.TANGRAM_DASH_SCALE=20,this.defines.TANGRAM_V_SCALE_ADJUST=m.default.tile_scale*this.defines.TANGRAM_DASH_SCALE;var t=p.default(this.dash,{scale:this.defines.TANGRAM_DASH_SCALE});this.texture="_"+this.name+"_dasharray",l.default.create(this.gl,this.texture,{data:t.pixels,height:t.length,width:1,filtering:"nearest"})}this.texture&&(this.defines.TANGRAM_LINE_TEXTURE=!0,this.defines.TANGRAM_ALPHA_TEST=.5,this.shaders.uniforms=this.shaders.uniforms||{},this.shaders.uniforms.u_texture=this.texture,this.shaders.uniforms.u_texture_ratio=1,l.default.getInfo(this.texture).then(function(t){t&&(e.shaders.uniforms.u_texture_ratio=t.height/t.width)}))},calcWidth:function(e,t){return e&&o.StyleParser.evalCachedDistanceProperty(e,t)||0},calcWidthNextZoom:function(e,t){t.zoom++;var r=this.calcWidth(e,t);return t.zoom--,r},_parseFeature:function(e,t,r){var n=this.feature_style,i=this.calcWidth(t.width,r);if(!(0>i)){var a=this.calcWidthNextZoom(t.next_width,r);if(!(0===i&&0===a||0>a)&&(n.width=i*r.units_per_meter_overzoom,n.next_width=2*a-i,n.next_width*=r.units_per_meter_overzoom,n.next_width/=2,n.color=this.parseColor(t.color,r),n.color)){if(n.z=t.z&&o.StyleParser.evalCachedDistanceProperty(t.z||0,r)||o.StyleParser.defaults.z,n.height=e.properties.height||o.StyleParser.defaults.height,n.extrude=o.StyleParser.evalProperty(t.extrude,r),n.extrude&&("number"==typeof n.extrude?n.height=n.extrude:Array.isArray(n.extrude)&&(n.height=n.extrude[1])),n.extrude&&n.height&&(n.z+=n.height),n.z*=m.default.height_scale,n.height*=m.default.height_scale,n.cap=t.cap,n.join=t.join,n.miter_limit=t.miter_limit,n.tile_edges=t.tile_edges,n.outline=n.outline||{width:{},next_width:{},preprocessed:!0},t.outline&&t.outline.visible!==!1&&t.outline.color&&t.outline.width){var s=2*this.calcWidth(t.outline.width,r),u=2*this.calcWidthNextZoom(t.outline.next_width,r);0===s&&0===u||0>s||0>u?(n.outline.width.value=null,n.outline.next_width.value=null,n.outline.color=null):(n.outline.width.value=s+i,n.outline.next_width.value=u+a,n.outline.color=t.outline.color,n.outline.cap=t.outline.cap||t.cap,n.outline.join=t.outline.join||t.join,n.outline.miter_limit=t.outline.miter_limit||t.miter_limit,n.outline.style=t.outline.style||this.name,n.outline.order=t.outline.order?this.parseOrder(t.outline.order,r):n.order,n.outline.order>n.order&&(n.outline.order=n.order),n.outline.order-=.5)}else n.outline.width.value=null,n.outline.next_width.value=null,n.outline.color=null;return n}}},_preprocess:function(e){return e.color=o.StyleParser.createColorPropertyCache(e.color),e.width=o.StyleParser.createPropertyCache(e.width,o.StyleParser.parseUnits),e.next_width=o.StyleParser.createPropertyCache(e.width,o.StyleParser.parseUnits),e.z=o.StyleParser.createPropertyCache(e.z,o.StyleParser.parseUnits),e.outline&&(e.outline.color=o.StyleParser.createColorPropertyCache(e.outline.color),e.outline.width=o.StyleParser.createPropertyCache(e.outline.width,o.StyleParser.parseUnits),e.outline.next_width=o.StyleParser.createPropertyCache(e.outline.width,o.StyleParser.parseUnits)),e},makeVertexTemplate:function(e){var t=0;return this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=e.z||0,this.vertex_template[t++]=this.scaleOrder(e.order),this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=e.next_width,this.vertex_template[t++]=255*e.color[0],this.vertex_template[t++]=255*e.color[1],this.vertex_template[t++]=255*e.color[2],this.vertex_template[t++]=255*e.color[3],this.selection&&(this.vertex_template[t++]=255*e.selection_color[0],this.vertex_template[t++]=255*e.selection_color[1],this.vertex_template[t++]=255*e.selection_color[2],this.vertex_template[t++]=255*e.selection_color[3]),this.texcoords&&(this.vertex_template[t++]=0,this.vertex_template[t++]=0),this.vertex_template},buildLines:function(e,t,r,n,i){if(this.feature_style=this.outline_feature_style,t.outline&&null!=t.outline.color&&null!=t.outline.width.value){var o=this.styles[t.outline.style];o&&o.addFeature(n.feature,t.outline,n)}this.feature_style=this.inline_feature_style;var a=this.makeVertexTemplate(t);h.buildPolylines(e,t.width,r,a,{cap:t.cap,join:t.join,miter_limit:t.miter_limit,scaling_index:this.vertex_layout.index.a_extrude,scaling_normalize:256,texcoord_index:this.vertex_layout.index.a_texcoord,texcoord_width:(t.width||t.next_width)/n.tile.overzoom2,texcoord_normalize:65535,closed_polygon:i&&i.closed_polygon,remove_tile_edges:!t.tile_edges&&i&&i.remove_tile_edges,tile_edge_tolerance:m.default.tile_scale*n.tile.pad_scale*2})},buildPolygons:function(e,t,r,n){for(var i=0;i<e.length;i++)this.buildLines(e[i],t,r,n,{closed_polygon:!0,remove_tile_edges:!0})}})},{"../../builders/polylines":201,"../../geo":203,"../../gl/constants":204,"../../gl/texture":210,"../../gl/vertex_layout":215,"../polygons/polygons":243,"../style":245,"../style_parser":247,"./dasharray":240}],242:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.Points=void 0;var i=function(){function e(e,t){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=e[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!t||r.length!==t);n=!0);}catch(u){i=!0,o=u}finally{try{!n&&s["return"]&&s["return"]()}finally{if(i)throw o}}return r}return function(t,r){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return e(t,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),o=e("../../utils/log"),a=n(o),s=e("../style"),u=e("../style_parser"),l=e("../../gl/constants"),c=n(l),f=e("../../gl/vertex_layout"),h=n(f),d=e("../../builders/points"),p=e("../../gl/texture"),_=n(p),m=e("../../geo"),g=n(m),v=e("../../vector"),y=n(v),b=e("../../labels/collision"),x=n(b),w=e("../../labels/label_point"),k=n(w),A=e("../../labels/point_placement"),T=n(A),E=e("../text/text_labels"),S=e("../../view"),R=e("../../utils/debug_settings"),M=n(R),O="uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_tile_proxy_depth;\nuniform bool u_tile_fade_in;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\nuniform float u_visible_time;\nuniform bool u_view_panning;\nuniform float u_view_pan_snap_timer;\n\nuniform mat4 u_model;\nuniform mat4 u_modelView;\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nattribute vec4 a_position;\nattribute vec4 a_shape;\nattribute vec4 a_color;\nattribute float a_outline_edge;\nattribute vec4 a_outline_color;\nattribute vec2 a_texcoord;\nattribute vec2 a_offset;\n\n#define PI 3.14159265359\n\n#ifdef TANGRAM_CURVED_LABEL\n    attribute vec4 a_offsets;\n    attribute vec4 a_pre_angles;\n    attribute vec4 a_angles;\n#endif\n\n#define TANGRAM_NORMAL vec3(0., 0., 1.)\n#define TANGRAM_PX_FADE_RANGE 2.\n\nvarying vec4 v_color;\nvarying vec2 v_texcoord;\nvarying vec4 v_world_position;\nvarying float v_alpha_factor;\nvarying float v_aa_factor;\n\n#ifdef TANGRAM_SHADER_POINT\n    varying float v_outline_edge;\n    varying vec4 v_outline_color;\n#endif\n\n#ifdef TANGRAM_MULTI_SAMPLER\n    varying float v_sampler;\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvec2 rotate2D(vec2 _st, float _angle) {\n    return mat2(cos(_angle),-sin(_angle),\n                sin(_angle),cos(_angle)) * _st;\n}\n\n// Assumes stops are [0, 0.33, 0.66, 0.99];\nfloat mix4linear(float a, float b, float c, float d, float x) {\n    return mix(mix(a, b, 3. * x),\n               mix(b,\n                   mix(c, d, 3. * (max(x, .66) - .66)),\n                   3. * (clamp(x, .33, .66) - .33)),\n               step(0.33, x)\n            );\n}\n\n// Determines if a shader-drawn point is being rendered (vs. a sprite or text label)\nbool isShaderPoint() {\n    #ifdef TANGRAM_SHADER_POINT\n        #ifdef TANGRAM_MULTI_SAMPLER\n            if (v_sampler == 0.) { // sprite sampler\n                return true;\n            }\n        #else\n            return true;\n        #endif\n    #endif\n    return false;\n}\n\nvoid main() {\n    // Initialize globals\n    #pragma tangram: setup\n\n    v_alpha_factor = 1.0;\n    v_color = a_color;\n    v_texcoord = a_texcoord;\n    v_aa_factor = 1. / length(a_shape.xy / 256.) * TANGRAM_PX_FADE_RANGE;\n\n    #ifdef TANGRAM_SHADER_POINT\n        v_outline_color = a_outline_color;\n        v_outline_edge = a_outline_edge;\n    #endif\n\n    // Position\n    vec4 position = u_modelView * vec4(a_position.xyz, 1.);\n\n    // Apply positioning and scaling in screen space\n    vec2 shape = a_shape.xy / 256.;                 // values have an 8-bit fraction\n    vec2 offset = vec2(a_offset.x, -a_offset.y);    // flip y to make it point down\n\n    float zoom = clamp(u_map_position.z - u_tile_origin.z, 0., 1.); //fract(u_map_position.z);\n    float theta = a_shape.z / 4096.;\n\n    #ifdef TANGRAM_CURVED_LABEL\n        if (a_offsets[0] != 0.){\n            #ifdef TANGRAM_FADE_ON_ZOOM_IN\n                v_alpha_factor *= clamp(1. + TANGRAM_FADE_ON_ZOOM_IN_RATE - TANGRAM_FADE_ON_ZOOM_IN_RATE * (u_map_position.z - u_tile_origin.z), 0., 1.);\n            #endif\n\n            vec4 angles_scaled = (PI / 16384.) * a_angles;\n            vec4 pre_angles_scaled = (PI / 128.) * a_pre_angles;\n            vec4 offsets_scaled = (1. / 64.) * a_offsets;\n\n            float pre_angle = mix4linear(pre_angles_scaled[0], pre_angles_scaled[1], pre_angles_scaled[2], pre_angles_scaled[3], zoom);\n            float angle = mix4linear(angles_scaled[0], angles_scaled[1], angles_scaled[2], angles_scaled[3], zoom);\n            float offset_curve = mix4linear(offsets_scaled[0], offsets_scaled[1], offsets_scaled[2], offsets_scaled[3], zoom);\n\n            shape = rotate2D(shape, pre_angle); // rotate in place\n            shape.x += offset_curve;            // offset for curved label segment\n            shape = rotate2D(shape, angle);     // rotate relative to curved label anchor\n            shape += rotate2D(offset, theta);   // offset if specified in the scene file\n        }\n        else {\n            shape = rotate2D(shape + offset, theta);\n        }\n    #else\n        shape = rotate2D(shape + offset, theta);\n    #endif\n\n    #ifdef TANGRAM_MULTI_SAMPLER\n        v_sampler = a_shape.w; // texture sampler\n    #endif\n\n    // Fade in (if requested) based on time mesh has been visible.\n    // Value passed to fragment shader in the v_alpha_factor varying\n    #ifdef TANGRAM_FADE_IN_RATE\n        if (u_tile_fade_in) {\n            v_alpha_factor *= clamp(u_visible_time * TANGRAM_FADE_IN_RATE, 0., 1.);\n        }\n    #endif\n\n    // Fade out when tile is zooming out, e.g. acting as proxy tiles\n    // NB: this is mostly done to compensate for text label collision happening at the label's 1x zoom. As labels\n    // in proxy tiles are scaled down, they begin to overlap, and the fade is a simple way to ease the transition.\n    // Value passed to fragment shader in the v_alpha_factor varying\n    #ifdef TANGRAM_FADE_ON_ZOOM_OUT\n        v_alpha_factor *= clamp(1. + TANGRAM_FADE_ON_ZOOM_OUT_RATE * (u_map_position.z - u_tile_origin.z), 0., 1.);\n    #endif\n\n    // World coordinates for 3d procedural textures\n    v_world_position = u_model * position;\n    v_world_position.xy += shape * u_meters_per_pixel;\n    v_world_position = wrapWorldPosition(v_world_position);\n\n    // Modify position before camera projection\n    #pragma tangram: position\n\n    cameraProjection(position);\n\n    #ifdef TANGRAM_LAYER_ORDER\n        // +1 is to keep all layers including proxies > 0\n        applyLayerOrder(a_position.w + u_tile_proxy_depth + 1., position);\n    #endif\n\n    // Apply pixel offset in screen-space\n    // Multiply by 2 is because screen is 2 units wide Normalized Device Coords (and u_resolution device pixels wide)\n    // Device pixel ratio adjustment is because shape is in logical pixels\n    position.xy += shape * position.w * 2. * u_device_pixel_ratio / u_resolution;\n\n    // Snap to pixel grid\n    // Only applied to fully upright sprites/labels (not shader-drawn points), while panning is not active\n    if (!u_view_panning && (abs(theta) < TANGRAM_EPSILON) && !isShaderPoint()) {\n        vec2 position_fract = fract((((position.xy / position.w) + 1.) * .5) * u_resolution);\n        vec2 position_snap = position.xy + ((step(0.5, position_fract) - position_fract) * position.w * 2. / u_resolution);\n\n        // Animate the snapping to smooth the transition and make it less noticeable\n        #ifdef TANGRAM_VIEW_PAN_SNAP_RATE\n            position.xy = mix(position.xy, position_snap, clamp(u_view_pan_snap_timer * TANGRAM_VIEW_PAN_SNAP_RATE, 0., 1.));\n        #else\n            position.xy = position_snap;\n        #endif\n    }\n\n    gl_Position = position;\n}\n",P="uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\nuniform float u_visible_time;\n\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nuniform sampler2D u_texture;\n\n#ifdef TANGRAM_MULTI_SAMPLER\nuniform sampler2D u_label_texture;\nvarying float v_sampler;\n#endif\n\nvarying vec4 v_color;\nvarying vec2 v_texcoord;\nvarying vec4 v_world_position;\nvarying float v_alpha_factor;\nvarying float v_aa_factor;\n\n#ifdef TANGRAM_SHADER_POINT\n    varying vec4 v_outline_color;\n    varying float v_outline_edge;\n#endif\n\n#define TANGRAM_NORMAL vec3(0., 0., 1.)\n\n// Alpha discard threshold (substitute for alpha blending)\n#ifndef TANGRAM_ALPHA_TEST\n#define TANGRAM_ALPHA_TEST 0.5\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvoid main (void) {\n    // Initialize globals\n    #pragma tangram: setup\n\n    vec4 color = v_color;\n\n    #ifdef TANGRAM_MULTI_SAMPLER\n    if (v_sampler == 0.) { // sprite sampler\n    #endif\n        #ifdef TANGRAM_TEXTURE_POINT\n            // Draw sprite\n            color *= texture2D(u_texture, v_texcoord);\n        #else\n            // Draw a point\n            vec2 uv = v_texcoord * 2. - 1.; // fade alpha near circle edge\n            float point_dist = length(uv);\n            color = mix(\n                color,\n                v_outline_color,\n                (1. - smoothstep(v_outline_edge - v_aa_factor, v_outline_edge + v_aa_factor, 1.-point_dist)) * step(.000001, v_outline_edge)\n            );\n            color.a = mix(color.a, 0., (smoothstep(1. - v_aa_factor, 1., point_dist)));\n\n        #endif\n    #ifdef TANGRAM_MULTI_SAMPLER\n    }\n    else { // label sampler\n        color = texture2D(u_label_texture, v_texcoord);\n        color.rgb /= max(color.a, 0.001); // un-multiply canvas texture\n    }\n    #endif\n\n    // Manually un-multiply alpha, for cases where texture has pre-multiplied alpha\n    #ifdef TANGRAM_UNMULTIPLY_ALPHA\n        color.rgb /= max(color.a, 0.001);\n    #endif\n\n    // If blending is off, use alpha discard as a lower-quality substitute\n    #if !defined(TANGRAM_BLEND_OVERLAY) && !defined(TANGRAM_BLEND_INLAY)\n        if (color.a < TANGRAM_ALPHA_TEST) {\n            discard;\n        }\n    #endif\n\n    #pragma tangram: color\n\n    color.a *= v_alpha_factor;\n\n    #pragma tangram: filter\n\n    gl_FragColor = color;\n}\n",z=k.default.PLACEMENT,L=128/Math.PI,N=16384/Math.PI,j=64,I=65535,C=r.Points=Object.create(s.Style);
-Object.assign(C,E.TextLabels),Object.assign(C,{name:"points",built_in:!0,collision:!0,blend:"overlay",init:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:[];s.Style.init.call(this,e),this.vertex_shader_src=O,this.fragment_shader_src=P;var r=[{name:"a_position",size:4,type:c.default.SHORT,normalized:!1},{name:"a_shape",size:4,type:c.default.SHORT,normalized:!1},{name:"a_texcoord",size:2,type:c.default.UNSIGNED_SHORT,normalized:!0},{name:"a_offset",size:2,type:c.default.SHORT,normalized:!1},{name:"a_color",size:4,type:c.default.UNSIGNED_BYTE,normalized:!0}];t.length&&Array.prototype.push.apply(r,t),this.selection=!0,r.push({name:"a_selection_color",size:4,type:c.default.UNSIGNED_BYTE,normalized:!0}),"overlay"!==this.blend&&(this.defines.TANGRAM_LAYER_ORDER=!0),this.shaders.uniforms=this.shaders.uniforms||{},this.shaders.uniforms.u_label_texture=_.default.default,this.texture?(this.defines.TANGRAM_TEXTURE_POINT=!0,this.shaders.uniforms.u_texture=this.texture):(this.defines.TANGRAM_SHADER_POINT=!0,r.push({name:"a_outline_color",size:4,type:c.default.UNSIGNED_BYTE,normalized:!0}),r.push({name:"a_outline_edge",size:1,type:c.default.FLOAT,normalized:!1})),this.vertex_layout=new h.default(r),this.defines.TANGRAM_MULTI_SAMPLER=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT_RATE=2,M.default.suppress_label_fade_in===!0?(this.fade_in_time=0,this.defines.TANGRAM_FADE_IN_RATE=null):(this.fade_in_time=.15,this.defines.TANGRAM_FADE_IN_RATE=1/this.fade_in_time),M.default.suppress_label_snap_animation!==!0&&(this.defines.TANGRAM_VIEW_PAN_SNAP_RATE=1/S.VIEW_PAN_SNAP_TIME),this.collision_group_points=this.name+"-points",this.collision_group_text=this.name+"-text",this.reset()},reset:function(){this.queues={},this.resetText(),this.texture_missing_sprites={}},addFeature:function(e,t,r){var n=r.tile;if(n.generation===this.generation&&(t=this.preprocess(t))){var i={};if(i.color=this.parseColor(t.color,r),i.color||this.texture){var o=void 0;if(this.hasSprites()){if(o=this.parseSprite(t,r),!o)return;i.texcoords=o.texcoords}if(i.size=t.size,i.size?(i.size=u.StyleParser.evalCachedProperty(i.size,r),"number"==typeof i.size&&(i.size=[i.size,i.size])):i.size=o?o.size:[16,16],t.outline&&(i.outline_width=u.StyleParser.evalCachedProperty(t.outline.width,r)||u.StyleParser.defaults.outline.width,i.outline_color=this.parseColor(t.outline.color,r)),i.outline_edge_pct=0,i.outline_width&&i.outline_color){var s=i.outline_width+1;i.size[0]+=s,i.size[1]+=s,i.outline_edge_pct=s/Math.min(i.size[0],i.size[1])*2}i.size=[Math.min(i.size[0],256),Math.min(i.size[1],256)],i.placement=t.placement,i.placement_min_length_ratio=u.StyleParser.evalCachedProperty(t.placement_min_length_ratio,r),i.placement===z.SPACED&&t.placement_spacing&&(i.placement_spacing=u.StyleParser.evalCachedProperty(t.placement_spacing,r)),i.angle=u.StyleParser.evalProperty(t.angle,r)||0,i.z=t.z&&u.StyleParser.evalCachedDistanceProperty(t.z,r)||u.StyleParser.defaults.z,i.tile_edges=t.tile_edges,i.sampler=0,this.computeLayout(i,e,t,r,n);var l=t.text&&t.text.visible!==!1&&this.parseTextFeature(e,t.text,r,n);Array.isArray(l)&&(l=null,a.default({level:"warn",once:!0},"Layer '"+t.layers[t.layers.length-1]+"': cannot use boundary labels (e.g. 'text_source: { left: ..., right: ... }') for 'text' labels attached to 'points'; "+("provided 'text_source' value was '"+JSON.stringify(t.text.text_source)+"'"))),l&&(l.layout.parent=i,l.layout.priority=t.text.priority?Math.max(l.layout.priority,i.priority+.5):i.priority+.5,l.layout.move_into_tile=!1,x.default.addStyle(this.collision_group_text,n.key)),this.queueFeature({feature:e,draw:t,context:r,style:i,text_feature:l},n),x.default.addStyle(this.collision_group_points,n.key)}}},hasSprites:function(){return this.texture&&_.default.textures[this.texture]&&_.default.textures[this.texture].sprites},getSpriteInfo:function(e){var t=_.default.textures[this.texture].sprites[e]&&_.default.getSpriteInfo(this.texture,e);return e&&!t&&(this.texture_missing_sprites[e]||(a.default("debug","Style: in style '"+this.name+"', could not find sprite '"+e+"' for texture '"+this.texture+"'"),this.texture_missing_sprites[e]=!0)),t},parseSprite:function(e,t){var r=u.StyleParser.evalProperty(e.sprite,t),n=this.getSpriteInfo(r)||this.getSpriteInfo(e.sprite_default);return n},queueFeature:function(e,t){this.tile_data[t.key]&&this.queues[t.key]||this.startData(t),this.queues[t.key].push(e)},startData:function(e){return this.queues[e.key]=[],s.Style.startData.call(this,e)},endData:function(e){var t=this;if(e.canceled)return a.default("trace","Style "+this.name+": stop tile build because tile was canceled: "+e.key),Promise.resolve();var r=this.queues[e.key];delete this.queues[e.key];var n=[],o=[];return r.forEach(function(e){for(var r=e.style,i=e.feature,a=i.geometry,s=t.buildLabels(r.size,a,r),u=0;u<s.length;u++){var l=s[u],c={feature:i,draw:e.draw,context:e.context,style:r,label:l};if(o.push(c),e.text_feature){var f={feature:i,draw:e.text_feature.draw,context:e.context,text:e.text_feature.text,text_settings_key:e.text_feature.text_settings_key,layout:e.text_feature.layout,point_label:l,linked:c};n.push(f),e.draw.text.optional||(c.linked=f)}}}),Promise.all([x.default.collide(o,this.collision_group_points,e.key).then(function(e){e.forEach(function(e){t.feature_style=e.style,t.feature_style.label=e.label,s.Style.addFeature.call(t,e.feature,e.draw,e.context)})}),this.prepareTextLabels(e,this.collision_group_text,n).then(function(r){return t.collideAndRenderTextLabels(e,t.collision_group_text,r)})]).then(function(r){var n=i(r,2),o=n[1],a=o.labels,u=o.texts,l=o.texture;return a&&u&&a.forEach(function(e){var r=e.text_settings_key,n=u[r]&&u[r][e.text],i=t.feature_style;i.label=e.label,i.size=n.size.logical_size,i.angle=0,i.texcoords=n.align[e.label.align].texcoords,i.sampler=1,s.Style.addFeature.call(t,e.feature,e.draw,e.context)}),t.freeText(e),s.Style.endData.call(t,e).then(function(e){return l&&e&&(e.uniforms=e.uniforms||{},e.textures=e.textures||[],e.uniforms.u_label_texture=l,e.textures.push(l)),e})})},_preprocess:function(e){return e.color=u.StyleParser.createColorPropertyCache(e.color),e.outline&&(e.outline.color=u.StyleParser.createColorPropertyCache(e.outline.color),e.outline.width=u.StyleParser.createPropertyCache(e.outline.width,function(e){return Array.isArray(e)?e.map(parseFloat):parseFloat(e)})),e.z=u.StyleParser.createPropertyCache(e.z,u.StyleParser.parseUnits),e.size=u.StyleParser.createPropertyCache(e.size,function(e){return Array.isArray(e)?e.map(parseFloat):parseFloat(e)}),e.offset=u.StyleParser.createPropertyCache(e.offset,function(e){return Array.isArray(e)&&e.map(parseFloat)||0}),e.buffer=u.StyleParser.createPropertyCache(e.buffer,function(e){return(Array.isArray(e)?e:[e,e]).map(parseFloat)||0}),e.repeat_distance=u.StyleParser.createPropertyCache(e.repeat_distance,parseFloat),e.placement=z[e.placement&&e.placement.toUpperCase()],null==e.placement&&(e.placement=z.VERTEX),e.placement_spacing=null!=e.placement_spacing?e.placement_spacing:80,e.placement_spacing=u.StyleParser.createPropertyCache(e.placement_spacing,parseFloat),e.placement_min_length_ratio=null!=e.placement_min_length_ratio?e.placement_min_length_ratio:1,e.placement_min_length_ratio=u.StyleParser.createPropertyCache(e.placement_min_length_ratio,parseFloat),e.angle="number"==typeof e.angle?e.angle*Math.PI/180:e.angle||0,e.text=this.preprocessText(e.text),e.text&&(e.text.key=e.key,e.text.repeat_group=e.text.repeat_group||e.repeat_group,e.text.anchor=e.text.anchor||this.default_anchor,e.text.optional="boolean"==typeof e.text.optional?e.text.optional:!1,e.text.interactive=e.text.interactive||e.interactive),e},default_anchor:["bottom","top","right","left"],computeLayout:function(e,t,r,n,i){var o=e||{};o.id=t,o.units_per_pixel=i.units_per_pixel||1,o.collide=r.collide===!1?!1:!0,o.cull_from_tile=null!=r.cull_from_tile?r.cull_from_tile:!1,o.move_into_tile=!1,o.anchor=r.anchor,o.offset=u.StyleParser.evalCachedProperty(r.offset,n)||u.StyleParser.zeroPair,o.buffer=u.StyleParser.evalCachedProperty(r.buffer,n)||u.StyleParser.zeroPair,o.repeat_distance=u.StyleParser.evalCachedProperty(r.repeat_distance,n),o.repeat_distance&&(o.repeat_distance*=o.units_per_pixel,o.repeat_group="function"==typeof r.repeat_group?r.repeat_group(n):"string"==typeof r.repeat_group?r.repeat_group:r.key);var a=r.priority;return null!=a?"function"==typeof a&&(a=a(n)):a=-1>>>0,o.priority=a,o},buildTextLabels:function(e,t){for(var r=[],n=0;n<t.length;n++){var i=t[n],o=this.texts[e][i.text_settings_key][i.text],a=o.size.collision_size;i.label=new k.default(i.point_label.position,a,i.layout),r.push(i)}return r},buildLabels:function(e,t,r){var n=[];if("Point"===t.type)n.push(new k.default(t.coordinates,e,r));else if("MultiPoint"===t.type)for(var i=t.coordinates,o=0;o<i.length;++o){var a=i[o];n.push(new k.default(a,e,r))}else if("LineString"===t.type)for(var s=t.coordinates,u=T.default(s,e,r),l=0;l<u.length;++l)n.push(u[l]);else if("MultiLineString"===t.type)for(var c=t.coordinates,f=0;f<c.length;f++)for(var h=c[f],d=T.default(h,e,r),p=0;p<d.length;++p)n.push(d[p]);else if("Polygon"===t.type)if(r.placement===z.CENTROID){var _=g.default.centroid(t.coordinates);n.push(new k.default(_,e,r))}else for(var m=t.coordinates,v=0;v<m.length;v++)for(var y=T.default(m[v],e,r),b=0;b<y.length;++b)n.push(y[b]);else if("MultiPolygon"===t.type)if(r.placement===z.CENTROID){var x=g.default.multiCentroid(t.coordinates);n.push(new k.default(x,e,r))}else for(var w=t.coordinates,A=0;A<w.length;A++)for(var E=w[A],S=0;S<E.length;S++)for(var R=T.default(E[S],e,r),M=0;M<R.length;++M)n.push(R[M]);return n},makeVertexTemplate:function(e){var t=e.color||u.StyleParser.defaults.color;if(this.fillVertexTemplate("a_position",0,{size:2}),this.fillVertexTemplate("a_position",e.z||0,{size:1,offset:2}),this.fillVertexTemplate("a_position",this.scaleOrder(e.order),{size:1,offset:3}),this.fillVertexTemplate("a_shape",0,{size:4}),this.fillVertexTemplate("a_texcoord",0,{size:2}),this.fillVertexTemplate("a_offset",0,{size:2}),this.fillVertexTemplate("a_color",y.default.mult(t,255),{size:4}),this.defines.TANGRAM_SHADER_POINT){var r=e.outline_color||u.StyleParser.defaults.outline.color;this.fillVertexTemplate("a_outline_color",y.default.mult(r,255),{size:4}),this.fillVertexTemplate("a_outline_edge",e.outline_edge_pct||u.StyleParser.defaults.outline.width,{size:1})}return this.selection&&this.fillVertexTemplate("a_selection_color",y.default.mult(e.selection_color,255),{size:4}),this.vertex_template},buildQuad:function(e,t,r,n,i,o,a,s,u,l,c,f){d.buildQuadsForPoints(e,c,f,{texcoord_index:this.vertex_layout.index.a_texcoord,position_index:this.vertex_layout.index.a_position,shape_index:this.vertex_layout.index.a_shape,offset_index:this.vertex_layout.index.a_offset,offsets_index:this.vertex_layout.index.a_offsets,pre_angles_index:this.vertex_layout.index.a_pre_angles,angles_index:this.vertex_layout.index.a_angles,outline_edge_index:o?null:this.vertex_layout.index.a_outline_edge},{quad:t,quad_normalize:256,offset:a,offsets:s,pre_angles:i,angle:4096*r,angles:n,shape_w:o,curve:l,texcoord_scale:u,texcoord_normalize:I,pre_angles_normalize:L,angles_normalize:N,offsets_normalize:j})},build:function(e,t){var r=e.label;"curved"===r.type?this.buildArticulatedLabel(r,e,t):this.buildLabel(r,e,t)},buildLabel:function(e,t,r){var n=this.makeVertexTemplate(t),i=e.angle||t.angle,o=void 0,a=void 0;e.type?(o=t.size[e.type],a=t.texcoords[e.type]):(o=t.size,a=t.texcoords);var s=e.offset;this.buildQuad([e.position],o,i,null,null,t.sampler,s,null,a,!1,r,n)},buildArticulatedLabel:function(e,t,r){for(var n=this.makeVertexTemplate(t),i=e.angle,o=0;o<e.num_segments;o++){var a=t.size[e.type][o],s=t.texcoords_stroke[o],u=e.offset||[0,0],l=e.position,c=e.angles[o],f=e.offsets[o],h=e.pre_angles[o];this.buildQuad([l],a,i,c,h,t.sampler,u,f,s,!0,r,n)}for(var d=0;d<e.num_segments;d++){var p=t.size[e.type][d],_=t.texcoords[e.type][d],m=e.offset||[0,0],g=e.position,v=e.angles[d],y=e.offsets[d],b=e.pre_angles[d];this.buildQuad([g],p,i,v,b,t.sampler,m,y,_,!0,r,n)}},buildLines:function(e,t,r){this.build(t,r)},buildPoints:function(e,t,r){this.build(t,r)},buildPolygons:function(e,t,r){this.build(t,r)},makeMesh:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};return r=Object.assign({},r,{fade_in_time:this.fade_in_time}),s.Style.makeMesh.call(this,e,t,r)}})},{"../../builders/points":199,"../../geo":203,"../../gl/constants":204,"../../gl/texture":210,"../../gl/vertex_layout":215,"../../labels/collision":216,"../../labels/label_point":220,"../../labels/point_placement":222,"../../utils/debug_settings":257,"../../utils/log":261,"../../vector":272,"../../view":273,"../style":245,"../style_parser":247,"../text/text_labels":251}],243:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.shaderSrc_polygonsFragment=r.shaderSrc_polygonsVertex=r.Polygons=void 0;var i=e("../style"),o=e("../style_parser"),a=e("../../gl/constants"),s=n(a),u=e("../../gl/vertex_layout"),l=n(u),c=e("../../builders/polygons"),f=e("../../geo"),h=n(f),d='uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_tile_proxy_depth;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\n\nuniform mat4 u_model;\nuniform mat4 u_modelView;\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nattribute vec4 a_position;\nattribute vec4 a_color;\n\n// Optional normal attribute, otherwise default to up\n#ifdef TANGRAM_NORMAL_ATTRIBUTE\n    attribute vec3 a_normal;\n    #define TANGRAM_NORMAL a_normal\n#else\n    #define TANGRAM_NORMAL vec3(0., 0., 1.)\n#endif\n\n// Optional dynamic line extrusion\n#ifdef TANGRAM_EXTRUDE_LINES\n    // xy: extrusion direction in xy plane\n    // z:  half-width of line (amount to extrude)\n    // w:  scaling factor for interpolating width between zooms\n    attribute vec4 a_extrude;\n#endif\n\nvarying vec4 v_position;\nvarying vec3 v_normal;\nvarying vec4 v_color;\nvarying vec4 v_world_position;\n\n// Optional texture UVs\n#ifdef TANGRAM_TEXTURE_COORDS\n    attribute vec2 a_texcoord;\n    varying vec2 v_texcoord;\n#endif\n\n// Optional model position varying for tile coordinate zoom\n#ifdef TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING\n    varying vec4 v_modelpos_base_zoom;\n#endif\n\n#if defined(TANGRAM_LIGHTING_VERTEX)\n    varying vec4 v_lighting;\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvoid main() {\n    // Initialize globals\n    #pragma tangram: setup\n\n    // Texture UVs\n    #ifdef TANGRAM_TEXTURE_COORDS\n        v_texcoord = a_texcoord;\n        #ifdef TANGRAM_EXTRUDE_LINES\n            v_texcoord.y *= TANGRAM_V_SCALE_ADJUST;\n        #endif\n    #endif\n\n    // Pass model position to fragment shader\n    #ifdef TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING\n        v_modelpos_base_zoom = modelPositionBaseZoom();\n    #endif\n\n    // Position\n    vec4 position = vec4(a_position.xy, a_position.z / TANGRAM_HEIGHT_SCALE, 1.); // convert height back to meters\n\n    #ifdef TANGRAM_EXTRUDE_LINES\n        vec2 extrude = a_extrude.xy / 256.; // values have an 8-bit fraction\n        float width = a_extrude.z;\n        float dwdz = a_extrude.w;\n\n        // Adjust line width based on zoom level, to prevent proxied lines from being either too small or too big.\n        // "Flattens" the zoom between 1-2 to peg it to 1 (keeps lines from prematurely shrinking), then interpolate\n        // and clamp to 4 (keeps lines from becoming too small when far away).\n        float dz = clamp(u_map_position.z - u_tile_origin.z, 0., 4.);\n        dz += step(1., dz) * (1. - dz) + mix(0., 2., clamp((dz - 2.) / 2., 0., 1.));\n\n        // Interpolate between zoom levels\n        width += dwdz * dz;\n\n        // Scale pixel dimensions to be consistent in screen space\n        // Scale from style zoom units back to tile zoom\n        width *= exp2(-dz - (u_tile_origin.z - u_tile_origin.w));\n\n        // Modify line width before extrusion\n        #pragma tangram: width\n\n        position.xy += extrude * width;\n    #endif\n\n    // World coordinates for 3d procedural textures\n    v_world_position = wrapWorldPosition(u_model * position);\n\n    // Adjust for tile and view position\n    position = u_modelView * position;\n\n    // Modify position before camera projection\n    #pragma tangram: position\n\n    // Setup varyings\n    v_position = position;\n    v_normal = normalize(u_normalMatrix * TANGRAM_NORMAL);\n    v_color = a_color;\n\n    #if defined(TANGRAM_LIGHTING_VERTEX)\n        // Vertex lighting\n        vec3 normal = v_normal;\n\n        // Modify normal before lighting\n        #pragma tangram: normal\n\n        // Pass lighting intensity to fragment shader\n        v_lighting = calculateLighting(position.xyz - u_eye, normal, vec4(1.));\n    #endif\n\n    // Camera\n    cameraProjection(position);\n\n    // +1 is to keep all layers including proxies > 0\n    applyLayerOrder(a_position.w + u_tile_proxy_depth + 1., position);\n\n    gl_Position = position;\n}\n',p="uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\n\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nvarying vec4 v_position;\nvarying vec3 v_normal;\nvarying vec4 v_color;\nvarying vec4 v_world_position;\n\n#define TANGRAM_NORMAL v_normal\n\n#ifdef TANGRAM_TEXTURE_COORDS\n    varying vec2 v_texcoord;\n#endif\n\n#ifdef TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING\n    varying vec4 v_modelpos_base_zoom;\n#endif\n\n#if defined(TANGRAM_LIGHTING_VERTEX)\n    varying vec4 v_lighting;\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvoid main (void) {\n    // Initialize globals\n    #pragma tangram: setup\n\n    vec4 color = v_color;\n    vec3 normal = TANGRAM_NORMAL;\n\n    // Apply raster to vertex color\n    #ifdef TANGRAM_RASTER_TEXTURE_COLOR\n        color *= sampleRaster(0); // multiplied to tint texture color\n    #endif\n\n    // Apply line texture\n    #ifdef TANGRAM_LINE_TEXTURE\n        vec2 _line_st = vec2(v_texcoord.x, fract(v_texcoord.y / u_texture_ratio));\n        vec4 _line_color = texture2D(u_texture, _line_st);\n\n        if (_line_color.a < TANGRAM_ALPHA_TEST) {\n            #ifdef TANGRAM_LINE_BACKGROUND_COLOR\n                color.rgb = TANGRAM_LINE_BACKGROUND_COLOR;\n            #elif !defined(TANGRAM_BLEND_OVERLAY) && !defined(TANGRAM_BLEND_INLAY)\n                discard; // use discard when alpha blending is unavailable\n            #else\n                color.a = 0.; // use alpha channel when blending is available\n            #endif\n        }\n        else {\n            color *= _line_color;\n        }\n    #endif\n\n    // First, get normal from raster tile (if applicable)\n    #ifdef TANGRAM_RASTER_TEXTURE_NORMAL\n        normal = normalize(sampleRaster(0).rgb * 2. - 1.);\n    #endif\n\n    // Second, alter normal with normal map texture (if applicable)\n    #if defined(TANGRAM_LIGHTING_FRAGMENT) && defined(TANGRAM_MATERIAL_NORMAL_TEXTURE)\n        calculateNormal(normal);\n    #endif\n\n    // Normal modification applied here for fragment lighting or no lighting,\n    // and in vertex shader for vertex lighting\n    #if !defined(TANGRAM_LIGHTING_VERTEX)\n        #pragma tangram: normal\n    #endif\n\n    // Color modification before lighting is applied\n    #pragma tangram: color\n\n    #if defined(TANGRAM_LIGHTING_FRAGMENT)\n        // Calculate per-fragment lighting\n        color = calculateLighting(v_position.xyz - u_eye, normal, color);\n    #elif defined(TANGRAM_LIGHTING_VERTEX)\n        // Apply lighting intensity interpolated from vertex shader\n        color *= v_lighting;\n    #endif\n\n    // Post-processing effects (modify color after lighting)\n    #pragma tangram: filter\n\n    gl_FragColor = color;\n}\n",_=r.Polygons=Object.create(i.Style);r.shaderSrc_polygonsVertex=d,r.shaderSrc_polygonsFragment=p,Object.assign(_,{name:"polygons",built_in:!0,vertex_shader_src:d,fragment_shader_src:p,init:function(){i.Style.init.apply(this,arguments);var e=[{name:"a_position",size:4,type:s.default.SHORT,normalized:!1},{name:"a_normal",size:3,type:s.default.BYTE,normalized:!0},{name:"a_color",size:4,type:s.default.UNSIGNED_BYTE,normalized:!0}];this.defines.TANGRAM_NORMAL_ATTRIBUTE=!0,this.defines.TANGRAM_LAYER_ORDER=!0,this.selection=!0,e.push({name:"a_selection_color",size:4,type:s.default.UNSIGNED_BYTE,normalized:!0}),this.texcoords&&(this.defines.TANGRAM_TEXTURE_COORDS=!0,e.push({name:"a_texcoord",size:2,type:s.default.UNSIGNED_SHORT,normalized:!0})),this.vertex_layout=new l.default(e)},_parseFeature:function(e,t,r){var n=this.feature_style;return n.color=this.parseColor(t.color,r),n.color?(n.z=t.z&&o.StyleParser.evalCachedDistanceProperty(t.z,r)||o.StyleParser.defaults.z,n.z*=h.default.height_scale,n.extrude=o.StyleParser.evalProperty(t.extrude,r),n.extrude&&(n.extrude===!0?(n.height=e.properties.height||o.StyleParser.defaults.height,n.min_height=e.properties.min_height||o.StyleParser.defaults.min_height):"number"==typeof n.extrude?(n.height=n.extrude,n.min_height=0):Array.isArray(n.extrude)&&(n.min_height=n.extrude[0],n.height=n.extrude[1]),n.height*=h.default.height_scale,n.min_height*=h.default.height_scale),n.tile_edges=t.tile_edges,n):null},_preprocess:function(e){return e.color=o.StyleParser.createColorPropertyCache(e.color),e.z=o.StyleParser.createPropertyCache(e.z,o.StyleParser.parseUnits),e},makeVertexTemplate:function(e){var t=0;return this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=e.z||0,this.vertex_template[t++]=this.scaleOrder(e.order),this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=127,this.vertex_template[t++]=255*e.color[0],this.vertex_template[t++]=255*e.color[1],this.vertex_template[t++]=255*e.color[2],this.vertex_template[t++]=255*e.color[3],this.selection&&(this.vertex_template[t++]=255*e.selection_color[0],this.vertex_template[t++]=255*e.selection_color[1],this.vertex_template[t++]=255*e.selection_color[2],this.vertex_template[t++]=255*e.selection_color[3]),this.texcoords&&(this.vertex_template[t++]=0,this.vertex_template[t++]=0),this.vertex_template},buildPolygons:function(e,t,r,n){var i=this.makeVertexTemplate(t),o={texcoord_index:this.vertex_layout.index.a_texcoord,texcoord_normalize:65535,remove_tile_edges:!t.tile_edges,tile_edge_tolerance:h.default.tile_scale*n.tile.pad_scale*4,winding:n.winding};t.extrude&&t.height?c.buildExtrudedPolygons(e,t.z,t.height,t.min_height,r,i,this.vertex_layout.index.a_normal,127,o):c.buildPolygons(e,r,i,o)}})},{"../../builders/polygons":200,"../../geo":203,"../../gl/constants":204,"../../gl/vertex_layout":215,"../style":245,"../style_parser":247}],244:[function(e,t,r){"use strict";Object.defineProperty(r,"__esModule",{value:!0}),r.RasterStyle=void 0;var n=e("../style_parser"),i=e("../polygons/polygons"),o=r.RasterStyle=Object.create(i.Polygons);Object.assign(o,{name:"raster","super":i.Polygons,built_in:!0,init:function(){this.raster=this.raster||"color",this.super.init.apply(this,arguments),this.selection=!1},_preprocess:function(e){return e.color=e.color||n.StyleParser.defaults.color,this.super._preprocess.apply(this,arguments)}})},{"../polygons/polygons":243,"../style_parser":247}],245:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.Style=void 0;var i=function(){function e(e,t){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=e[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!t||r.length!==t);n=!0);}catch(u){i=!0,o=u}finally{try{!n&&s["return"]&&s["return"]()}finally{if(i)throw o}}return r}return function(t,r){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return e(t,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),o=e("./style_parser"),a=e("../selection"),s=n(a),u=e("../gl/shader_program"),l=n(u),c=e("../gl/vbo_mesh"),f=n(c),h=e("../gl/texture"),d=n(h),p=e("../material"),_=n(p),m=e("../light"),g=n(m),v=e("../sources/raster"),y=e("../utils/log"),b=n(y),x=e("../utils/merge"),w=n(x),k=e("../utils/thread"),A=n(k),T=e("../utils/worker_broker"),E=n(T),S="// Fragment shader for feature selection passes\n// Renders in silhouette according to selection (picking) color, or black if none defined\n\n#ifdef TANGRAM_FEATURE_SELECTION\n    varying vec4 v_selection_color;\n#endif\n\nvoid main (void) {\n    #ifdef TANGRAM_FEATURE_SELECTION\n        gl_FragColor = v_selection_color;\n    #else\n        gl_FragColor = vec4(0., 0., 0., 1.);\n    #endif\n}\n",R="// Uniforms defining raster textures and macros for accessing them\n\n#ifdef TANGRAM_FRAGMENT_SHADER\nuniform sampler2D u_rasters[TANGRAM_NUM_RASTER_SOURCES];    // raster tile texture samplers\nuniform vec2 u_raster_sizes[TANGRAM_NUM_RASTER_SOURCES];    // raster tile texture sizes (width/height in pixels)\nuniform vec3 u_raster_offsets[TANGRAM_NUM_RASTER_SOURCES];  // raster tile texture UV starting offset for tile\n\n// Note: the raster accessors below are #defines rather than functions to\n// avoid issues with constant integer expressions for array indices\n\n// Adjusts UVs in model space to account for raster tile texture overzooming\n// (applies scale and offset adjustments)\n#define adjustRasterUV(raster_index, uv) \\\n    ((uv) * u_raster_offsets[raster_index].z + u_raster_offsets[raster_index].xy)\n\n// Returns the UVs of the current model position for a raster sampler\n#define currentRasterUV(raster_index) \\\n    (adjustRasterUV(raster_index, v_modelpos_base_zoom.xy))\n\n// Returns pixel location in raster tile texture at current model position\n#define currentRasterPixel(raster_index) \\\n    (currentRasterUV(raster_index) * rasterPixelSize(raster_index))\n\n// Samples a raster tile texture for the current model position\n#define sampleRaster(raster_index) \\\n    (texture2D(u_rasters[raster_index], currentRasterUV(raster_index)))\n\n// Samples a raster tile texture for a given pixel\n#define sampleRasterAtPixel(raster_index, pixel) \\\n    (texture2D(u_rasters[raster_index], adjustRasterUV(raster_index, (pixel) / rasterPixelSize(raster_index))))\n\n// Returns size of raster sampler in pixels\n#define rasterPixelSize(raster_index) \\\n    (u_raster_sizes[raster_index])\n\n#endif\n",M=r.Style={init:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.generation,r=e.styles,n=e.sources,i=void 0===n?{}:n,a=e.introspection;this.generation=t,this.styles=r,this.sources=i,this.defines=this.hasOwnProperty("defines")&&this.defines||{},this.shaders=this.hasOwnProperty("shaders")&&this.shaders||{},this.introspection=a||!1,this.selection=this.selection||this.introspection||!1,this.compile_setup=!1,this.program=null,this.selection_program=null,this.feature_style={},this.vertex_template=[],this.tile_data={},this.main_thread_target=["Style",this.name,this.generation].join("/"),A.default.is_main&&E.default.addTarget(this.main_thread_target,this),this.defines.TANGRAM_WORLD_POSITION_WRAP=1e5,this.blend=this.blend||"opaque",this.defines["TANGRAM_BLEND_"+this.blend.toUpperCase()]=!0,null==this.blend_order&&(this.blend_order=-1),this.removeShaderBlock("setup"),this.material instanceof _.default||(_.default.isValid(this.material)||(this.material=o.StyleParser.defaults.material),this.material=new _.default(this.material)),this.material.inject(this),g.default.setMode(this.lighting,this),this.setupRasters(),this.initialized=!0},destroy:function(){this.program&&(this.program.destroy(),this.program=null),this.selection_program&&(this.selection_program.destroy(),this.selection_program=null),this.gl=null,this.initialized=!1},reset:function(){},baseStyle:function(){return this.base||this.name},fillVertexTemplate:function(e,t,r){var n=r.size,i=r.offset;i=void 0===i?0:i;var o=this.vertex_layout.index[e];if(void 0===o)return void b.default("warn","Style: in style '"+this.name+"', no index found in vertex layout for attribute '"+e+"'");for(var a=0;n>a;++a){var s=t.length>a?t[a]:t;this.vertex_template[o+a+i]=s}},startData:function(e){return this.tile_data[e.key]={vertex_data:null,uniforms:{},textures:[]},this.tile_data[e.key]},endData:function(e){var t=this.tile_data[e.key];return this.tile_data[e.key]=null,t&&t.vertex_data&&t.vertex_data.vertex_count>0?(t.vertex_data.end(),t.vertex_elements=t.vertex_data.element_buffer,t.vertex_data=t.vertex_data.vertex_buffer,this.buildRasterTextures(e,t).then(function(){return t})):Promise.resolve(null)},hasDataForTile:function(e){return null!=this.tile_data[e]},addFeature:function(e,t,r){var n=r.tile;if(n.generation===this.generation){this.tile_data[n.key]||this.startData(n);var i=this.parseFeature(e,t,r);i&&(this.tile_data[n.key].vertex_data||(this.tile_data[n.key].vertex_data=this.vertex_layout.createVertexData()),this.buildGeometry(e.geometry,i,this.tile_data[n.key].vertex_data,r))}},buildGeometry:function(e,t,r,n){"Polygon"===e.type?this.buildPolygons([e.coordinates],t,r,n):"MultiPolygon"===e.type?this.buildPolygons(e.coordinates,t,r,n):"LineString"===e.type?this.buildLines([e.coordinates],t,r,n):"MultiLineString"===e.type?this.buildLines(e.coordinates,t,r,n):"Point"===e.type?this.buildPoints([e.coordinates],t,r,n):"MultiPoint"===e.type&&this.buildPoints(e.coordinates,t,r,n)},parseFeature:function(e,t,r){try{var n=this.feature_style;if(t=this.preprocess(t),!t)return;if(n.order=this.parseOrder(t.order,r),null==n.order&&"overlay"!==this.blend)return void b.default({level:"warn",once:!0},"Layer '"+t.layers[t.layers.length-1]+"': 'order' parameter is required unless blend mode is 'overlay'");var i=!1;return n.interactive=this.introspection||t.interactive,this.selection&&(i=o.StyleParser.evalProperty(n.interactive,r)),n.selection_color=i?s.default.makeColor(e,r.tile,r):s.default.defaultColor,n=this._parseFeature(e,t,r)}catch(a){b.default("error","Style.parseFeature: style parsing error",e,n,a)}},_parseFeature:function(){return this.feature_style},preprocess:function(e){if(!e.preprocessed){if(this.draw&&w.default(e,this.draw),e=this._preprocess(e),!e)return;e.preprocessed=!0}return e},_preprocess:function(e){return e},parseOrder:function(e,t){return"number"!=typeof e?o.StyleParser.calculateOrder(e,t):e},scaleOrder:function(e){return 2*e},parseColor:function(e,t){return e?o.StyleParser.evalCachedColorProperty(e,t):this.shaders.blocks.color||this.shaders.blocks.filter?o.StyleParser.defaults.color:void 0},buildPolygons:function(){},buildLines:function(){},buildPoints:function(){},setGL:function(e){this.gl=e,this.max_texture_size=d.default.getMaxTextureSize(this.gl)},makeMesh:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};return new f.default(this.gl,e,t,this.vertex_layout,r)},render:function(e){return e.render()},getProgram:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"program";this.compileSetup();var t=this[e];if(t&&!t.error)return t.compiled||(b.default("debug","Compiling style '"+this.name+"', program key '"+e+"'"),t.compile()),t},compileSetup:function(){if(!this.compile_setup){if(!this.gl)throw new Error("style.compile(): skipping for "+this.name+" because no GL context");var e=this.buildDefineList();if(this.selection){var t=Object.assign({},e);t.TANGRAM_FEATURE_SELECTION=!0}var r=this.shaders&&this.shaders.blocks,n=this.shaders&&this.shaders.block_scopes,i=Object.assign({},this.shaders&&this.shaders.uniforms);for(var o in i)null==i[o]&&b.default({level:"warn",once:!0},"Style '"+this.name+"' has invalid uniform '"+o+"': uniform values must be non-null");
-var a=this.shaders&&this.shaders.extensions;"string"==typeof a&&(a=[a]),this.program=new l.default(this.gl,this.vertex_shader_src,this.fragment_shader_src,{name:this.name,defines:e,uniforms:i,blocks:r,block_scopes:n,extensions:a}),this.selection_program=this.selection?new l.default(this.gl,this.vertex_shader_src,S,{name:this.name+" (selection)",defines:t,uniforms:i,blocks:r,block_scopes:n,extensions:a}):null,this.compile_setup=!0}},addShaderBlock:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null;this.shaders.blocks=this.shaders.blocks||{},this.shaders.blocks[e]=this.shaders.blocks[e]||[],this.shaders.blocks[e].push(t),this.shaders.block_scopes=this.shaders.block_scopes||{},this.shaders.block_scopes[e]=this.shaders.block_scopes[e]||[],this.shaders.block_scopes[e].push(r)},removeShaderBlock:function(e){this.shaders.blocks&&(this.shaders.blocks[e]=null)},replaceShaderBlock:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null;this.removeShaderBlock(e),this.addShaderBlock(e,t,r)},buildDefineList:function(){var e={};if(null!=this.defines)for(var t in this.defines)e[t]=this.defines[t];if(null!=this.shaders&&null!=this.shaders.defines)for(t in this.shaders.defines)e[t]=this.shaders.defines[t];return e},hasRasters:function(){return["color","normal","custom"].indexOf(this.raster)>-1},setupRasters:function(){var e=this;if(this.hasRasters()){"color"===this.raster?this.defines.TANGRAM_RASTER_TEXTURE_COLOR=!0:"normal"===this.raster&&(this.defines.TANGRAM_RASTER_TEXTURE_NORMAL=!0);var t=Object.keys(this.sources).filter(function(t){return e.sources[t]instanceof v.RasterTileSource}).length;this.defines.TANGRAM_NUM_RASTER_SOURCES="int("+t+")",t>0&&(this.defines.TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING=!0,this.replaceShaderBlock("raster",R,"Raster"))}},buildRasterTextures:function(e,t){var r=this;if(!this.hasRasters())return Promise.resolve(t);var n={},o={};return e.rasters.map(function(e){return r.sources[e]}).filter(function(e){return e}).forEach(function(t,r){if(t instanceof v.RasterTileSource){var i=t.tileTexture(e);n[i.url]=i,o[i.url]=r}}),0===Object.keys(n).length?Promise.resolve(t):E.default.postMessage(this.main_thread_target+".loadTextures",n).then(function(r){if(!r||r.length<1)return t;t.uniforms=t.uniforms||{},t.textures=t.textures||[];var a=t.uniforms.u_rasters=[],s=t.uniforms.u_raster_sizes=[],u=t.uniforms.u_raster_offsets=[];return r.forEach(function(r){var l=i(r,3),c=l[0],f=l[1],h=l[2],d=o[c],p=n[c].coords;if(a[d]=c,t.textures.push(c),s[d]=[f,h],e.coords.z>p.z){var _=e.coords.z-p.z,m=Math.pow(2,_);u[d]=[e.coords.x%m/m,(m-1-e.coords.y%m)/m,1/m]}else u[d]=[0,0,1]}),t})},loadTextures:function(e){return d.default.createFromObject(this.gl,e).then(function(){return Promise.all(Object.keys(e).map(function(e){return d.default.textures[e]&&d.default.textures[e].load()}).filter(function(e){return e}))}).then(function(e){return e.forEach(function(e){return e.retain()}),e.map(function(e){return[e.name,e.width,e.height]})})},setup:function(){this.setUniforms(),this.material.setupProgram(l.default.current)},setUniforms:function(){var e=l.default.current;e&&e.setUniforms(this.shaders&&this.shaders.uniforms,!0)},render_states:{opaque:{depth_test:!0,depth_write:!0},add:{depth_test:!0,depth_write:!1},multiply:{depth_test:!0,depth_write:!1},inlay:{depth_test:!0,depth_write:!1},overlay:{depth_test:!1,depth_write:!1}},default_blend_orders:{opaque:0,add:1,multiply:2,inlay:3,overlay:4},blendOrderSort:function(e,t){return"opaque"===e.blend||"opaque"===t.blend?"opaque"===e.blend&&"opaque"===t.blend?e.name<t.name?-1:1:"opaque"===e.blend?-1:1:e.blend_order<t.blend_order?-1:e.blend_order>t.blend_order?1:M.default_blend_orders[e.blend]<M.default_blend_orders[t.blend]?-1:M.default_blend_orders[e.blend]>M.default_blend_orders[t.blend]?1:e.name<t.name?-1:1}}},{"../gl/shader_program":209,"../gl/texture":210,"../gl/vbo_mesh":212,"../light":225,"../material":226,"../selection":232,"../sources/raster":236,"../utils/log":261,"../utils/merge":263,"../utils/thread":267,"../utils/worker_broker":271,"./style_parser":247}],246:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function o(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0}),r.StyleManager=void 0;{var a=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),s=e("../gl/shader_program"),u=n(s),l=e("../utils/merge"),c=n(l),f=e("../geo"),h=n(f),d=e("../utils/log"),p=n(d),_=e("./polygons/polygons"),m=e("./lines/lines"),g=e("./points/points"),v=e("./text/text"),y=e("./raster/raster"),b="#ifdef TANGRAM_VERTEX_SHADER\n\n// Vertex position in model space: [0, 1] range over the local tile\n// Note positions can be outside that range due to unclipped geometry, geometry higher than a unit cube, etc.\nvec4 modelPosition() {\n    return\n        vec4(\n            a_position.xyz / TANGRAM_TILE_SCALE         // scale coords to ~0-1 range\n            * exp2(u_tile_origin.z - u_tile_origin.w),  // adjust for tile overzooming\n        1.)\n        + vec4(0., 1., 0., 0.);\n        // NB: additional offset to account for unusual Tangram JS y coords,\n        // should be refactored to remove\n}\n\n// Position in model space as above, but according to tile coordinate (as opposed to style) zoom\n// e.g. unadjusted for tile overzooming\nvec4 modelPositionBaseZoom() {\n    return\n        vec4(\n            a_position.xyz / TANGRAM_TILE_SCALE,    // scale coords to ~0-1 range\n        1.)\n        + vec4(0., 1., 0., 0.); // see note on offset above\n}\n\n#endif\n\n// Vertex position in world coordinates, useful for 3d procedural textures, etc.\nvec4 worldPosition() {\n    return v_world_position;\n}\n\n// Optionally wrap world coordinates (allows more precision at higher zooms)\n// e.g. at wrap 1000, the world space will wrap every 1000 meters\n#ifdef TANGRAM_VERTEX_SHADER\n\nvec4 wrapWorldPosition(vec4 world_position) {\n    #if defined(TANGRAM_WORLD_POSITION_WRAP)\n    vec2 anchor = u_tile_origin.xy - mod(u_tile_origin.xy, TANGRAM_WORLD_POSITION_WRAP);\n        world_position.xy -= anchor;\n    #endif\n    return world_position;\n}\n\n#endif\n\n// Normal in world space\n#if defined(TANGRAM_VERTEX_SHADER)\n\nvec3 worldNormal() {\n    return TANGRAM_NORMAL;\n}\n\n#elif defined(TANGRAM_FRAGMENT_SHADER)\n\nvec3 worldNormal() {\n    return u_inverseNormalMatrix * TANGRAM_NORMAL;\n}\n\n#endif\n",x="// Apply layer ordering to avoid z-fighting\nvoid applyLayerOrder (float layer, inout vec4 position) {\n    position.z -= layer * TANGRAM_LAYER_DELTA * position.w;\n}\n",w="// Vertex attribute + varying for feature selection\n#if defined(TANGRAM_FEATURE_SELECTION) && defined(TANGRAM_VERTEX_SHADER)\n    attribute vec4 a_selection_color;\n    varying vec4 v_selection_color;\n#endif\n",k="// Selection pass-specific rendering\n#if defined(TANGRAM_FEATURE_SELECTION) && defined(TANGRAM_VERTEX_SHADER)\n    if (a_selection_color.rgb == vec3(0.)) {\n        // Discard by forcing invalid triangle if we're in the feature\n        // selection pass but have no selection info\n        // TODO: in some cases we may actually want non-selectable features to occlude selectable ones?\n        gl_Position = vec4(0., 0., 0., 1.);\n        return;\n    }\n    v_selection_color = a_selection_color;\n#endif\n";r.StyleManager=function(){function e(){o(this,e),this.styles={},this.base_styles={},this.register(Object.create(_.Polygons)),this.register(Object.create(m.Lines)),this.register(Object.create(g.Points)),this.register(Object.create(v.TextStyle)),this.register(Object.create(y.RasterStyle))}return a(e,[{key:"init",value:function(){u.default.removeBlock("global"),u.default.removeBlock("setup"),u.default.addBlock("global",b),u.default.addBlock("global",x),u.default.addBlock("global",w),u.default.replaceBlock("setup",k),u.default.defines.TANGRAM_EPSILON=1e-5,u.default.defines.TANGRAM_LAYER_DELTA=1/16384,u.default.defines.TANGRAM_TILE_SCALE="vec3("+h.default.tile_scale+"., "+h.default.tile_scale+"., u_meters_per_pixel * "+h.default.tile_size+".)",u.default.defines.TANGRAM_HEIGHT_SCALE=h.default.height_scale}},{key:"destroy",value:function(e){var t=this;Object.keys(this.styles).forEach(function(r){var n=t.styles[r];n.gl===e&&(p.default("trace","StyleManager.destroy: destroying render style "+n.name),n.base&&t.remove(n.name),n.destroy())})}},{key:"register",value:function(e){this.styles[e.name]=e,this.base_styles[e.name]=e}},{key:"remove",value:function(e){delete this.styles[e]}},{key:"mix",value:function(e,t){if(e.mixed)return e;e.mixed={};var r=[];if(e.mix){if(Array.isArray(e.mix)){var n;(n=r).push.apply(n,i(e.mix))}else r.push(e.mix);r=r.map(function(e){return t[e]}).filter(function(t){return t&&t!==e}),r.forEach(function(t){return e.mixed[t.name]=!0})}r.push(e),e.animated=r.some(function(e){return e&&e.animated}),e.texcoords=r.some(function(e){return e&&e.texcoords}),e.base=r.map(function(e){return e.base}).filter(function(e){return e}).pop(),e.lighting=r.map(function(e){return e.lighting}).filter(function(e){return null!=e}).pop(),e.texture=r.map(function(e){return e.texture}).filter(function(e){return e}).pop(),e.raster=r.map(function(e){return e.raster}).filter(function(e){return null!=e}).pop(),e.dash=r.map(function(e){return e.dash}).filter(function(e){return null!=e}).pop(),e.dash_background_color=r.map(function(e){return e.dash_background_color}).filter(function(e){return null!=e}).pop(),r.some(function(e){return e.hasOwnProperty("blend")&&e.blend})&&(e.blend=r.map(function(e){return e.hasOwnProperty("blend")&&e.blend}).filter(function(e){return e}).pop()),e.blend_order=r.map(function(e){return e.blend_order}).filter(function(e){return null!=e}).pop(),e.defines=Object.assign.apply(Object,[{}].concat(i(r.map(function(e){return e.defines}).filter(function(e){return e})))),e.material=Object.assign.apply(Object,[{}].concat(i(r.map(function(e){return e.material}).filter(function(e){return e}))));var o=r.map(function(e){return e.draw}).filter(function(e){return e});return o.length>0&&(e.draw=c.default.apply(void 0,[{}].concat(i(o)))),this.mixShaders(e,t,r),e}},{key:"mixShaders",value:function(e,t,r){var n={},o=r.map(function(e){return e.shaders}).filter(function(e){return e});if(n.defines=Object.assign.apply(Object,[{}].concat(i(o.map(function(e){return e.defines}).filter(function(e){return e})))),n.uniforms={},n._uniforms=e.shaders&&e.shaders.uniforms||{},n._uniform_scopes={},r.filter(function(e){return e.shaders&&e.shaders.uniforms}).forEach(function(e){var 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g.default.loadFonts().then(function(){for(var i in t){e.text_cache[i]=e.text_cache[i]||{};var o=t[i],a=!0;for(var c in o){var f=o[c],h=f.text_settings;if(a&&(r.setFont(h),n=d.default.device_pixel_ratio*h.supersample,a=!1),h.can_articulate){for(var p=l(c),_=c.split(" "),m=!1,g=!1,v=!1,y=0;y<_.length;y++)if(u(_[y])){if(g){v=!0;break}m=!0}else{if(m){v=!0;break}g=!0}var b=m&&!g&&!v,x=s(c);f.isRTL=b,f.no_curving=v||x,f.vertical_buffer=r.vertical_text_buffer,b&&p.reverse(),f.segments=p,f.size=[];for(var w=0;w<p.length;w++){var k=p[w];e.text_cache[i][k]?e.cache_stats.hits++:(e.text_cache[i][k]=r.textSize(k,h),e.cache_stats.misses++),f.size.push(e.text_cache[i][k].size)}e.text_cache[i][c]?e.cache_stats.hits++:(e.text_cache[i][c]=r.textSize(c,h),e.cache_stats.misses++),f.total_size=e.text_cache[i][c].size}else e.text_cache[i][c]?e.cache_stats.hits++:(e.text_cache[i][c]=r.textSize(c,h),e.cache_stats.misses++),f.size=e.text_cache[i][c].size}}return t})}},{key:"textSize",value:function(e,t){var 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x=d.default.device_pixel_ratio*_,w=x*(this.horizontal_text_buffer+f),k=x*this.vertical_text_buffer,A=r.collision_size,T=2;this.context.strokeStyle="blue",this.context.lineWidth=T,this.context.strokeRect(a+w,s+k,x*A[0],x*A[1]),"curved"===i&&this.context.strokeRect(a+r.texture_size[0]+w,s+k,x*A[0],x*A[1]),this.context.restore()}if(y.default.draw_label_texture_boxes){this.context.save();var E=r.texture_size,S=2;this.context.strokeStyle="green",this.context.lineWidth=S,this.context.strokeRect(a+S,s+S,E[0]-2*S,E[1]-2*S),"curved"===i&&this.context.strokeRect(a+S+r.texture_size[0],s+S,E[0]-2*S,E[1]-2*S),this.context.restore()}}},{key:"drawTextLine",value:function(e,t,r,n,i){var o=c(t,2),a=o[0],s=o[1],u=n.stroke,l=n.stroke_width,f=void 0===l?0:l,h=n.transform,p=n.align,_=n.supersample,m=d.default.device_pixel_ratio*_;p=p||"center";var g=this.vertical_text_buffer*m,v=r.texture_size,y=r.line_height,b=m*(f+this.horizontal_text_buffer),x=this.applyTextTransform(e.text,h),w=void 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c.align)this.drawTextMultiLine(M,c.align[O].texture_position,c.size,{stroke:f.stroke,stroke_width:f.stroke_width,transform:f.transform,supersample:f.supersample,align:O}),c.align[O].texcoords=_.default.getTexcoordsForSprite(c.align[O].texture_position,c.size.texture_size,r)}}}}},{key:"setTextureTextPositions",value:function(t,r,n){e.texcoord_cache[n]||(e.texcoord_cache[n]={});var i=0,s=0,u=0,l=0;for(var c in t){e.texcoord_cache[n][c]||(e.texcoord_cache[n][c]={});var f=t[c];for(var h in f){var d=f[h];if(d.text_settings.can_articulate)for(var p=void 0,_=0;_<d.type.length;_++){var m=d.type[_];switch(m){case"straight":var g=d.total_size.texture_size,v=d.segments.reduce(d.isRTL?o:a);g[0]>i&&(i=g[0]),u+g[1]<r?(p=[s,u],u+=g[1],u>l&&(l=u)):(s+=i,i=0,u=0,p=[s,u]),e.texcoord_cache[n][c][v]={texture_position:p};break;case"curved":for(var y=0;y<d.size.length;y++){var b=d.segments[y];if(!e.texcoord_cache[n][c][b]){var x=d.size[y].texture_size,w=2*x[0];w>i&&(i=w),u+x[1]<r?(p=[s,u],u+=x[1],u>l&&(l=u)):(s+=i,i=0,u=0,p=[s,u]),e.texcoord_cache[n][c][b]={texture_position:p}}}}}else{var k=d.size.texture_size;k[0]>i&&(i=k[0]);for(var A in d.align)u+k[1]<r?(d.align[A].texture_position=[s,u],u+=k[1],u>l&&(l=u)):(s+=i,i=0,u=0,d.align[A].texture_position=[s,u])}}}return[s+i,l]}},{key:"applyTextTransform",value:function(e,t){return"capitalize"===t?e.replace(/\w\S*/g,function(e){return e.charAt(0).toUpperCase()+e.substr(1)}):"uppercase"===t?e.toUpperCase():"lowercase"===t?e.toLowerCase():e}},{key:"clearTexcoordCache",value:function(t){e.texcoord_cache[t]={}}}],[{key:"fontPixelSize",value:function(t){if(null!=t){t="string"==typeof t?t:String(t);var r=t.match(e.font_size_re)||[],n=c(r,3),i=n[1],o=n[2];return o=o||"px","em"===o?i*=16:"pt"===o?i/=.75:"%"===o&&(i/=6.25),i=parseFloat(i),i*=d.default.device_pixel_ratio}}}]),e}();r.default=x,x.font_size_re=/((?:[0-9]*\.)?[0-9]+)\s*(px|pt|em|%)?/,x.text_cache={},x.cache_stats={hits:0,misses:0},x.texcoord_cache={};var w={Arabic:"؀-ۿ",Bengali:"ঀ-৿",Burmese:"က-႟",Devanagari:"ऀ-ॿ",Khmer:"ក-៿",Gujarati:"઀-૿",Gurmukhi:"਀-੿",Kannada:"ಀ-೿",Lao:"຀-໿",Mongolian:"᠀-᢯",Oriya:"଀-୿",Tamil:"஀-௿",Telugu:"ఀ-౿",Tibetan:"ༀ-࿿"},k="[";for(var A in w)k+=w[A];k+="]";var T=new RegExp(k),E=new RegExp("^[\x00-@[-`{-¿×÷ʹ-˿ -⯿‐-\u2029‬ -⯿֑-߿‏‫‮יִ-﷽ﹰ-ﻼ]+$"),S=function(){function e(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:1/0,n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:1/0;i(this,e),this.width=0,this.height=0,this.lines=[],this.ellipsis="...",this.ellipsis_width=Math.ceil(t.measureText(this.ellipsis).width),this.max_lines=r,this.text_wrap=n,this.context=t}return f(e,[{key:"createLine",value:function(e){return this.lines.length<this.max_lines?new R(e,this.text_wrap):!1}},{key:"push",value:function(e){if(this.lines.length<this.max_lines){var t=this.context.measureText(e.text).width;return e.width=t,t>this.width&&(this.width=Math.ceil(t)),this.lines.push(e),this.height+=e.height,!0}return this.addEllipsis(),!1}},{key:"advance",value:function(e,t){var r=this.push(e);return r?this.createLine(t):!1}},{key:"addEllipsis",value:function(){var e=this.lines[this.lines.length-1];e.append(this.ellipsis),e.width+=this.ellipsis_width,e.width>this.width&&(this.width=e.width)}},{key:"finish",value:function(e){e?this.push(e):this.addEllipsis()}}],[{key:"parse",value:function(t,r,n,i,o){var a=void 0;a="number"==typeof r?t.split(" "):[t];for(var s=new e(o,n,r),u=s.createLine(i),l=0;l<a.length;l++){for(var c=a[l].split("\n"),f=0===l?!0:!1,h=0;h<c.length&&u;h++){var d=c[h];if(d){var p=f?d:" "+d;if(r&&l>0&&u.exceedsTextwrap(p)){if(u=s.advance(u,i),!u)break;u.append(d),f=!0}else u.append(p);h<c.length-1&&(u=s.advance(u,i),f=!0)}}l===a.length-1&&s.finish(u)}return s}}]),e}(),R=function(){function e(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:0,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:0;i(this,e),this.chars=0,this.text="",this.height=Math.ceil(t),this.text_wrap=r}return f(e,[{key:"append",value:function(e){this.chars+=e.length,this.text+=e}},{key:"exceedsTextwrap",value:function(e){return e.length+this.chars>this.text_wrap}}]),e}()},{"../../gl/texture":210,"../../utils/debug_settings":257,"../../utils/utils":269,"./font_manager":249}],249:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},o=e("../../utils/log"),a=n(o),s=e("../../utils/utils"),u=n(s),l=e("fontfaceobserver"),c=n(l),f={fonts_loaded:Promise.resolve(),last_loaded:null,loadFonts:function(e){var t=this,r=JSON.stringify(e)===this.last_loaded;return e&&!r&&!function(){var r=[],n=function(n){Array.isArray(e[n])?e[n].forEach(function(e){return r.push(t.loadFontFace(n,e))}):r.push(t.loadFontFace(n,e[n]))};for(var i in e)n(i);t.last_loaded=JSON.stringify(e),t.fonts_loaded=Promise.all(r.filter(function(e){return e}))}(),this.fonts_loaded},loadFontFace:function(e,t){if(null!=t&&("object"===("undefined"==typeof t?"undefined":i(t))||"external"===t)){var r={family:e},n=Promise.resolve();"object"===("undefined"==typeof t?"undefined":i(t))&&(Object.assign(r,t),"string"==typeof t.url&&(n=this.injectFontFace(r)));var o=new c.default(e,r);return n.then(function(){return o.load()}).then(function(){a.default("debug","Font face '"+e+"' is available",r)},function(){a.default("debug","Font face '"+e+"' is NOT available",r)})}},injectFontFace:function(e){var t=this,r=e.family,n=e.url,i=e.weight,o=e.style;void 0===this.supports_native_font_loading&&(this.supports_native_font_loading=void 0!==window.FontFace);var s=Promise.resolve(n);return"blob:"===n.slice(0,5)&&(s=u.default.io(n,6e4,"arraybuffer").then(function(e){var r=new Uint8Array(e);if(t.supports_native_font_loading)return r;for(var n="",i=0;i<r.length;i++)n+=String.fromCharCode(r[i]);return"data:font/opentype;base64,"+btoa(n)})),s.then(function(e){if(t.supports_native_font_loading){var n=void 0;"string"==typeof e?n=new FontFace(r,"url("+encodeURI(e)+")",{weight:i,style:o}):e instanceof Uint8Array&&(n=new FontFace(r,e,{weight:i,style:o})),document.fonts.add(n),a.default("trace","Adding FontFace to document.fonts:",n)}else{var s="\n                    @font-face {\n                        font-family: '"+r+"';\n                        font-weight: "+(i||"normal")+";\n                        font-style: "+(o||"normal")+";\n                        src: url("+encodeURI(e)+");\n                    }\n                ",u=document.createElement("style");u.appendChild(document.createTextNode("")),document.head.appendChild(u),u.sheet.insertRule(s,0),a.default("trace","Injecting CSS font face:",s)}})}};r.default=f},{"../../utils/log":261,"../../utils/utils":269,fontfaceobserver:78}],250:[function(e,t,r){"use strict";
-function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.TextStyle=void 0;var i=e("../../geo"),o=n(i),a=e("../style"),s=e("../points/points"),u=e("../../labels/collision"),l=n(u),c=e("../../labels/label_point"),f=n(c),h=e("../../labels/label_line"),d=n(h),p=e("../../gl/constants"),_=n(p),m=r.TextStyle=Object.create(s.Points);Object.assign(m,{name:"text","super":s.Points,built_in:!0,init:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=[{name:"a_angles",size:4,type:_.default.SHORT,normalized:!1},{name:"a_offsets",size:4,type:_.default.UNSIGNED_SHORT,normalized:!1},{name:"a_pre_angles",size:4,type:_.default.BYTE,normalized:!1}];this.super.init.call(this,e,t),this.defines.TANGRAM_TEXTURE_POINT=!0,this.defines.TANGRAM_SHADER_POINT=!1,this.defines.TANGRAM_CURVED_LABEL=!0,this.defines.TANGRAM_MULTI_SAMPLER=!1,this.defines.TANGRAM_UNMULTIPLY_ALPHA=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT_RATE=2,this.defines.TANGRAM_FADE_ON_ZOOM_IN=!0,this.defines.TANGRAM_FADE_ON_ZOOM_IN_RATE=2,this.reset()},makeVertexTemplate:function(e){return this.super.makeVertexTemplate.call(this,e),this.fillVertexTemplate("a_pre_angles",0,{size:4}),this.fillVertexTemplate("a_offsets",0,{size:4}),this.fillVertexTemplate("a_angles",0,{size:4}),this.vertex_template},reset:function(){this.queues={},this.resetText()},addFeature:function(e,t,r){var n=this,i=r.tile;if(i.generation===this.generation&&(t=this.preprocess(t))){var o=e.geometry.type;t.can_articulate="LineString"===o||"MultiLineString"===o,t.supersample_text="LineString"===o||"MultiLineString"===o;var a=this.parseTextFeature(e,t,r,i);a&&(a instanceof Array?a.forEach(function(t){t.feature=e,t.context=r,t.layout.vertex=!1,n.queueFeature(t,i)}):(a.feature=e,a.context=r,a.layout.vertex=!1,this.queueFeature(a,i)),l.default.addStyle(this.name,i.key))}},startData:function(e){return this.queues[e.key]=[],a.Style.startData.call(this,e)},endData:function(e){var t=this,r=this.queues[e.key];return delete this.queues[e.key],this.prepareTextLabels(e,this.name,r).then(function(r){return t.collideAndRenderTextLabels(e,t.name,r)}).then(function(r){var n=r.labels,i=r.texts,o=r.texture;return i&&(t.texts[e.key]=i,n.forEach(function(r){var n=r.text_settings_key,i=t.texts[e.key][n]&&t.texts[e.key][n][r.text],o=t.feature_style;o.label=r.label,i.text_settings.can_articulate?(o.size={},o.texcoords={},"straight"===r.label.type?(o.size.straight=i.total_size.logical_size,o.texcoords.straight=i.texcoords.straight):(o.size.curved=i.size.map(function(e){return e.logical_size}),o.texcoords_stroke=i.texcoords_stroke,o.texcoords.curved=i.texcoords.curved)):(o.size=i.size.logical_size,o.texcoords=i.align[r.label.align].texcoords),a.Style.addFeature.call(t,r.feature,r.draw,r.context)})),t.freeText(e),a.Style.endData.call(t,e).then(function(e){return o&&e?(e.uniforms.u_texture=o,e.textures.push(o),e):void 0})})},_preprocess:function(e){return this.preprocessText(e)},buildTextLabels:function(e,t){for(var r=[],n=0;n<t.length;n++){var i=t[n],o=this.texts[e][i.text_settings_key][i.text],a=void 0;if(i.layout.vertical_buffer=o.vertical_buffer,o.text_settings.can_articulate){var s=o.size.map(function(e){return e.collision_size});i.layout.no_curving=o.no_curving,a=this.buildLabels(s,i.feature.geometry,i.layout,o.total_size.collision_size)}else a=this.buildLabels(o.size.collision_size,i.feature.geometry,i.layout);for(var u=0;u<a.length;u++){var l=Object.create(i);l.label=a[u],r.push(l)}}return r},buildLabels:function(e,t,r,n){var i=[];if("LineString"===t.type)Array.prototype.push.apply(i,this.buildLineLabels(t.coordinates,e,r,n));else if("MultiLineString"===t.type)for(var a=t.coordinates,s=0;s<a.length;++s)Array.prototype.push.apply(i,this.buildLineLabels(a[s],e,r,n));else if("Point"===t.type)i.push(new f.default(t.coordinates,e,r));else if("MultiPoint"===t.type)for(var u=t.coordinates,l=0;l<u.length;++l)i.push(new f.default(u[l],e,r));else if("Polygon"===t.type){var c=o.default.centroid(t.coordinates);i.push(new f.default(c,e,r))}else if("MultiPolygon"===t.type){var h=o.default.multiCentroid(t.coordinates);i.push(new f.default(h,e,r))}return i},buildLineLabels:function(e,t,r,n){var i=[],o=Math.min(r.subdiv,e.length-1);if(o>1)for(var a=(e.length-1)/o,s=0;o>s;s++){var u=Math.floor(s*a),l=Math.floor((s+1)*a)+1,c=e.slice(u,l),f=d.default.create(t,n,c,r);f&&i.push(f)}else{var h=d.default.create(t,n,e,r);h&&i.push(h)}return i}}),m.texture_id=0},{"../../geo":203,"../../gl/constants":204,"../../labels/collision":216,"../../labels/label_line":219,"../../labels/label_point":220,"../points/points":242,"../style":245}],251:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}Object.defineProperty(r,"__esModule",{value:!0}),r.TextLabels=void 0;{var o="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},a=e("../style_parser"),s=e("../../gl/texture"),u=n(s),l=e("../../geo"),c=n(l),f=e("../../utils/log"),h=n(f),d=e("../../utils/thread"),p=n(d),_=e("../../utils/worker_broker"),m=n(_),g=e("../../labels/collision"),v=n(g),y=e("../text/text_settings"),b=n(y),x=e("../text/canvas_text"),w=n(x),k=0;r.TextLabels={resetText:function(){p.default.is_main?this.canvas=new w.default:p.default.is_worker&&(this.texts={})},freeText:function(e){delete this.texts[e.key]},parseTextFeature:function(e,t,r,n){var i=this.parseTextSource(e,t,r);if(null!=i&&""!==i){var o=b.default.compute(e,t,r),a=b.default.key(o);this.texts[n.key]=this.texts[n.key]||{};var s=this.texts[n.key][a]=this.texts[n.key][a]||{};if(i instanceof Object){var u=[],l=i.left+"-"+i.right;for(var c in i){var f=i[c];if(f){var h=this.computeTextLayout({},e,t,r,n,f,o,l,c);s[f]||(s[f]={text_settings:o,ref:0}),u.push({draw:t,text:f,text_settings_key:a,layout:h})}}return u}var d=this.computeTextLayout({},e,t,r,n,i,o);return s[i]||(s[i]={text_settings:o,ref:0}),{draw:t,text:i,text_settings_key:a,layout:d}}},parseTextSource:function(e,t,r){var n=void 0,i=t.text_source||"name";if(null!=i&&"object"===("undefined"==typeof i?"undefined":o(i))){n={};for(var a in i)n[a]=this.parseTextSourceValue(i[a],e,r)}else n=this.parseTextSourceValue(i,e,r);return n},parseTextSourceValue:function(e,t,r){var n=void 0;if(Array.isArray(e)){for(var i=0;i<e.length;i++)if("string"==typeof e[i]?n=t.properties[e[i]]:"function"==typeof e[i]&&(n=e[i](r)),n)return n}else"string"==typeof e?n=t.properties[e]:e instanceof Function&&(n=e(r));return n},prepareTextLabels:function(e,t,r){var n=this;return 0===Object.keys(this.texts[e.key]||{}).length?Promise.resolve({}):m.default.postMessage(this.main_thread_target+".calcTextSizes",this.texts[e.key]).then(function(t){return e.canceled?void h.default("trace","Style "+n.name+": stop tile build because tile was canceled: "+e.key+", post-calcTextSizes()"):(n.texts[e.key]=t,t?n.buildTextLabels(e.key,r):void 0)})},collideAndRenderTextLabels:function(e,t,r){var n=this;return r?v.default.collide(r,t,e.key).then(function(t){if(e.canceled)return h.default("trace","stop tile build because tile was canceled: "+e.key+", post-collide()"),{};if(0===t.length)return{};var r=n.texts[e.key];return n.cullTextStyles(r,t),t.forEach(function(e){var t=e.text_settings_key,n=r[t]&&r[t][e.text];n.text_settings.can_articulate?(n.type||(n.type=[]),-1===n.type.indexOf(e.label.type)&&n.type.push(e.label.type)):(n.align=n.align||{},n.align[e.label.align]={})}),m.default.postMessage(n.main_thread_target+".rasterizeTexts",e.key,r).then(function(r){var n=r.texts,i=r.texture;return e.canceled?(h.default("trace","stop tile build because tile was canceled: "+e.key+", post-rasterizeTexts()"),{}):{labels:t,texts:n,texture:i}})}):(v.default.collide({},t,e.key),Promise.resolve({}))},cullTextStyles:function(e,t){for(var r=0;r<t.length;r++){var n=t[r];e[n.text_settings_key][n.text].ref++}for(var i in e)for(var o in e[i])e[i][o].ref<1&&delete e[i][o];for(var a in e)0===Object.keys(e[a]).length&&delete e[a]},calcTextSizes:function(e){return this.canvas.textSizes(e)},rasterizeTexts:function(e,t){var r=new w.default;r.clearTexcoordCache(e);var n=r.setTextureTextPositions(t,this.max_texture_size,e);h.default("trace","text summary for tile "+e+": fits in "+n[0]+"x"+n[1]+"px"),n[0]<this.max_texture_size&&n[1]<this.max_texture_size?(r.resize.apply(r,i(n)),r.rasterize(t,n,e)):h.default("error",["Label atlas for tile "+e+" is "+n[0]+"x"+n[1]+"px, ","but max GL texture size is "+this.max_texture_size+"x"+this.max_texture_size+"px"].join(""));var o="labels-"+e+"-"+k++;return u.default.create(this.gl,o,{element:r.canvas,filtering:"linear",UNPACK_PREMULTIPLY_ALPHA_WEBGL:!0}),u.default.retain(o),{texts:t,texture:o}},preprocessText:function(e){return e&&e.font&&"object"===o(e.font)?(e.font.fill=a.StyleParser.createPropertyCache(e.font.fill),e.font.stroke&&(e.font.stroke.color=a.StyleParser.createPropertyCache(e.font.stroke.color)),e.font.px_size=a.StyleParser.createPropertyCache(e.font.size||b.default.defaults.size,w.default.fontPixelSize),e.font.stroke&&null!=e.font.stroke.width&&(e.font.stroke.width=a.StyleParser.createPropertyCache(e.font.stroke.width,parseFloat)),e.offset=a.StyleParser.createPropertyCache(e.offset,function(e){return Array.isArray(e)&&e.map(parseFloat)||0}),e.buffer=a.StyleParser.createPropertyCache(e.buffer,function(e){return(Array.isArray(e)?e:[e,e]).map(parseFloat)||0}),e.repeat_distance=a.StyleParser.createPropertyCache(e.repeat_distance||c.default.tile_size,parseFloat),e):void 0},computeTextLayout:function(e,t,r,n,i,o,a,s,u){var l=e||{};return l=this.computeLayout(l,t,r,n,i),l.cull_from_tile=null!=r.cull_from_tile?r.cull_from_tile:!0,l.move_into_tile=null!=r.move_into_tile?r.move_into_tile:!0,l.repeat_distance&&(s&&(l.repeat_group+="/"+s),l.repeat_group+="/"+o),l.subdiv=i.overzoom2,l.align=r.align,l.italic="normal"!==a.style,"right"===u?l.orientation=1:"left"===u&&(l.orientation=-1),l}}}},{"../../geo":203,"../../gl/texture":210,"../../labels/collision":216,"../../utils/log":261,"../../utils/thread":267,"../../utils/worker_broker":271,"../style_parser":247,"../text/canvas_text":248,"../text/text_settings":252}],252:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i,o=e("../../utils/utils"),a=n(o),s=e("../../geo"),u=n(s),l=e("../style_parser");r.default=i={key:function(e){return[e.style,e.weight,e.family,e.px_size,e.fill,e.stroke,e.stroke_width,e.transform,e.text_wrap,e.max_lines,e.supersample,a.default.device_pixel_ratio].join("/")},defaults:{style:"normal",weight:null,size:"12px",px_size:12,family:"Helvetica",fill:"white",text_wrap:15,max_lines:5,align:"center",stroke:null,stroke_width:0},compute:function(e,t,r){var n={};t.font=t.font||this.defaults,n.can_articulate=t.can_articulate,n.fill=t.font.fill&&a.default.toCSSColor(l.StyleParser.evalCachedColorProperty(t.font.fill,r))||this.defaults.fill,n.style=t.font.style||this.defaults.style,n.weight=t.font.weight||this.defaults.weight,t.font.family?(n.family=t.font.family,n.family!==this.defaults.family&&(n.family+=", "+this.defaults.family)):n.family=this.defaults.family,n.transform=t.font.transform,n.size=t.font.size||this.defaults.size,n.supersample=t.supersample_text?1.5:1,n.px_size=l.StyleParser.evalCachedProperty(t.font.px_size,r)*n.supersample,t.font.stroke&&t.font.stroke.color&&(n.stroke=a.default.toCSSColor(l.StyleParser.evalCachedColorProperty(t.font.stroke.color,r)||this.defaults.stroke),n.stroke_width=l.StyleParser.evalCachedProperty(t.font.stroke.width,r)||this.defaults.stroke_width),n.font_css=this.fontCSS(n);var i=t.text_wrap;return null==i&&"line"!==u.default.geometryType(e.geometry.type)&&(i=!0),i===!0&&(i=this.defaults.text_wrap),n.text_wrap=i,n.max_lines=t.max_lines||this.defaults.max_lines,n},fontCSS:function(e){var t=e.style,r=e.weight,n=e.px_size,i=e.family;return[t,r,n+"px",i].filter(function(e){return e}).join(" ")}}},{"../../geo":203,"../../utils/utils":269,"../style_parser":247}],253:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function o(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var a=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),s=e("./utils/log"),u=n(s),l=e("./utils/utils"),c=n(l),f=e("./utils/merge"),h=n(f),d=e("./geo"),p=n(d),_=e("./styles/style_parser"),m=e("./labels/collision"),g=n(m),v=e("./utils/worker_broker"),y=n(v),b=e("./gl/texture"),x=n(b),w=e("./utils/gl-matrix"),k=function(){function e(t){var r=t.coords,n=t.style_zoom,i=t.source,a=t.worker,s=t.view;o(this,e),this.worker=a,this.view=s,this.source=i,this.generation=null,this.visible=!1,this.proxy_for=null,this.proxy_depth=0,this.proxied_as=null,this.fade_in=!0,this.loading=!1,this.loaded=!1,this.built=!1,this.error=null,this.debug={},this.coords=e.coordinateWithMaxZoom(r,this.source.max_zoom),this.style_zoom=n,this.overzoom=Math.max(this.style_zoom-this.coords.z,0),this.overzoom2=Math.pow(2,this.overzoom),this.key=e.key(this.coords,this.source,this.style_zoom),this.min=p.default.metersForTile(this.coords),this.max=p.default.metersForTile({x:this.coords.x+1,y:this.coords.y+1,z:this.coords.z}),this.span={x:this.max.x-this.min.x,y:this.max.y-this.min.y},this.bounds={sw:{x:this.min.x,y:this.max.y},ne:{x:this.max.x,y:this.min.y}},this.center_dist=0,this.meters_per_pixel=p.default.metersPerPixel(this.style_zoom),this.meters_per_pixel_sq=this.meters_per_pixel*this.meters_per_pixel,this.units_per_pixel=p.default.units_per_pixel/this.overzoom2,this.units_per_meter_overzoom=p.default.unitsPerMeter(this.coords.z)*this.overzoom2,this.meshes={},this.textures=[],this.previous_textures=[],this.new_mesh_styles=[]}return a(e,[{key:"freeResources",value:function(){for(var e in this.meshes)this.meshes[e].destroy();this.meshes={},this.textures.forEach(function(e){return x.default.release(e)}),this.textures=[],this.previous_textures.forEach(function(e){return x.default.release(e)}),this.previous_textures=[]}},{key:"destroy",value:function(){this.workerMessage("self.removeTile",this.key),this.freeResources(),this.worker=null}},{key:"buildAsMessage",value:function(){return{key:this.key,source:this.source.name,coords:this.coords,min:this.min,max:this.max,units_per_pixel:this.units_per_pixel,meters_per_pixel:this.meters_per_pixel,meters_per_pixel_sq:this.meters_per_pixel_sq,units_per_meter_overzoom:this.units_per_meter_overzoom,style_zoom:this.style_zoom,overzoom:this.overzoom,overzoom2:this.overzoom2,generation:this.generation,debug:this.debug}}},{key:"workerMessage",value:function(){for(var e=arguments.length,t=Array(e),r=0;e>r;r++)t[r]=arguments[r];return y.default.postMessage.apply(y.default,[this.worker].concat(t))}},{key:"build",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},r=t.fade_in,n=void 0===r?!0:r;return this.generation=e,this.fade_in=n,this.loaded||(this.loading=!0,this.built=!1),this.workerMessage("self.buildTile",{tile:this.buildAsMessage()}).catch(function(e){throw e})}},{key:"buildMeshes",value:function(e,t){var r;if(!this.error){t.start&&(this.debug.geometry_count=0,this.debug.buffer_size=0);var n={},o=[],a=this.mesh_data;if(a)for(var s in a){if(a[s].vertex_data){if(!e[s]){u.default("warn","Could not create mesh because style '"+s+"' not found, for tile "+this.key+", aborting tile");break}n[s]=e[s].makeMesh(a[s].vertex_data,a[s].vertex_elements,a[s]),this.debug.buffer_size+=n[s].buffer_size,this.debug.geometry_count+=n[s].geometry_count}a[s].textures&&o.push.apply(o,i(a[s].textures))}delete this.mesh_data,t.start&&(this.new_mesh_styles=[],this.previous_textures=[].concat(i(this.textures)),this.textures=[]);for(var l in n)this.meshes[l]&&this.meshes[l].destroy(),this.meshes[l]=n[l],this.new_mesh_styles.push(l);if((r=this.textures).push.apply(r,o),t.done){for(var c in this.meshes)-1===this.new_mesh_styles.indexOf(c)&&this.meshes[c].destroy();this.new_mesh_styles=[],this.previous_textures.forEach(function(e){return x.default.release(e)}),this.previous_textures=[],this.debug.geometry_ratio=(this.debug.geometry_count/this.debug.feature_count).toFixed(1),this.printDebug()}}}},{key:"update",value:function(){var t=this.coords;t.z!==this.view.center.tile.z&&(t=e.coordinateAtZoom(t,this.view.center.tile.z)),this.center_dist=Math.abs(this.view.center.tile.x-t.x)+Math.abs(this.view.center.tile.y-t.y)}},{key:"setProxyFor",value:function(e){e?(this.visible=!0,this.proxy_for=this.proxy_for||[],this.proxy_for.push(e),this.proxy_depth=1,e.proxied_as=e.style_zoom>this.style_zoom?"child":"parent",this.update()):(this.proxy_for=null,this.proxy_depth=0)}},{key:"shouldProxyForStyle",value:function(e){return!this.proxy_for||this.proxy_for.some(function(t){return null==t.meshes[e]})}},{key:"setupProgram",value:function(e,t){var r=e.model,n=e.model32;t.uniform("4fv","u_tile_origin",[this.min.x,this.min.y,this.style_zoom,this.coords.z]),t.uniform("1f","u_tile_proxy_depth",this.proxy_depth),w.mat4.identity(r),w.mat4.translate(r,r,w.vec3.fromValues(this.min.x,this.min.y,0)),w.mat4.scale(r,r,w.vec3.fromValues(this.span.x/p.default.tile_scale,-1*this.span.y/p.default.tile_scale,1)),w.mat4.copy(n,r),t.uniform("Matrix4fv","u_model",n),t.uniform("1i","u_tile_fade_in",this.fade_in&&"child"!==this.proxied_as)}},{key:"merge",value:function(e){return this.loading=e.loading,this.loaded=e.loaded,this.generation=e.loaded,this.error=e.error,this.mesh_data=e.mesh_data,this.debug=h.default(this.debug,e.debug),this}},{key:"printDebug",value:function(){u.default("debug","Tile: debug for "+this.key+": [  "+JSON.stringify(this.debug)+" ]")}}],[{key:"create",value:function(t){return new e(t)}},{key:"coord",value:function(t){return{x:t.x,y:t.y,z:t.z,key:e.coordKey(t)}}},{key:"coordKey",value:function(e){var t=e.x,r=e.y,n=e.z;return t+"/"+r+"/"+n}},{key:"key",value:function(t,r,n){return t=e.coordinateWithMaxZoom(t,r.max_zoom),t.y<0||t.y>=1<<t.z||t.z<0?void 0:[r.name,n,t.x,t.y,t.z].join("/")}},{key:"coordinateAtZoom",value:function(t,r){{var n=t.x,i=t.y,o=t.z;t.key}if(o!==r){var a=Math.pow(2,o-r);n=Math.floor(n/a),i=Math.floor(i/a),o=r}return e.coord({x:n,y:i,z:o})}},{key:"coordinateWithMaxZoom",value:function(t,r){var n=t.x,i=t.y,o=t.z;return void 0!==r&&o>r?e.coordinateAtZoom({x:n,y:i,z:o},r):e.coord({x:n,y:i,z:o})}},{key:"childrenForCoordinate",value:function(t){var r=t.x,n=t.y,i=t.z,o=t.key;return e.coord_children[o]||(i++,r*=2,n*=2,e.coord_children[o]=[e.coord({x:r,y:n,z:i}),e.coord({x:r+1,y:n,z:i}),e.coord({x:r,y:n+1,z:i}),e.coord({x:r+1,y:n+1,z:i})]),e.coord_children[o]}},{key:"isDescendant",value:function(t,r){if(r.z>t.z){var n=e.coordinateAtZoom(r,t.z),i=n.x,o=n.y;return t.x===i&&t.y===o}return!1}},{key:"sort",value:function(e){return e.sort(function(e,t){var r=e.center_dist,n=t.center_dist;return n>r?-1:n===r?0:1})}},{key:"cancel",value:function(t){t&&(t.canceled=!0,t.source_data&&t.source_data.request_id&&(c.default.cancelRequest(t.source_data.request_id),t.source_data.request_id=null),e.abortBuild(t))}},{key:"buildGeometry",value:function(t,r){var n=r.scene_id,i=r.layers,o=r.styles,a=r.global,s=t.source_data;t.debug.rendering=+new Date,t.debug.feature_count=0,g.default.startTile(t.key);for(var l in i){var c=i[l];if(c&&c.config_data){if(c.config_data.source===t.source)for(var f=e.getDataForSource(s,c.config_data,l),h=0;h<f.length;h++){var d=f[h],p=d.geom;if(p)for(var m=0;m<p.features.length;m++){var v=p.features[m];if(null!=v.geometry){var y=_.StyleParser.getFeatureParseContext(v,t,a);y.winding=t.default_winding,y.source=t.source,y.layer=d.layer;var b=c.buildDrawGroups(y,!0);if(b){for(var x in b){var w=b[x];if(w.visible){var k=w.style||x,A=o[k];A?(y.layers=w.layers,A.addFeature(v,w,y)):u.default("warn","Style '"+k+"' not found, skipping layer '"+l+"':",w,v)}}t.debug.feature_count++}}}}}else u.default("warn","Layer "+l+" was defined without a geometry data source and will not be rendered.")}t.debug.rendering=+new Date-t.debug.rendering;var T=this.stylesForTile(t.key,o).map(function(e){return o[e]});e.sendStyleGroups(t,T,{scene_id:n},function(e){return e.collision?"collision":"non-collision"})}},{key:"stylesForTile",value:function(e,t){var r=[];for(var n in t)t[n].hasDataForTile(e)&&r.push(n);return r}},{key:"sendStyleGroups",value:function(t,r,n,i){var o=n.scene_id,a={};r.forEach(function(e){var t=i(e);a[t]=a[t]||[],a[t].push(e)}),Object.keys(a).length>0?!function(){var r={start:!0};t.mesh_data={};var n=function(n){var i=a[n];Promise.all(i.map(function(e){return e.endData(t).then(function(r){r&&(t.mesh_data[e.name]={vertex_data:r.vertex_data,vertex_elements:r.vertex_elements,uniforms:r.uniforms,textures:r.textures})})})).then(function(){u.default("trace","Finished style group '"+n+"' for tile "+t.key),a[n]=[],Object.keys(a).every(function(e){return 0===a[e].length})&&(r.done=!0),y.default.postMessage("TileManager_"+o+".buildTileStylesCompleted",y.default.withTransferables({tile:e.slice(t,["mesh_data"]),progress:r})),r.start=null,t.mesh_data={},r.done&&g.default.resetTile(t.key)})};for(var i in a)n(i)}():(y.default.postMessage("TileManager_"+o+".buildTileStylesCompleted",y.default.withTransferables({tile:e.slice(t),progress:{start:!0,done:!0}})),g.default.resetTile(t.key))}},{key:"getDataForSource",value:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null,n=[];return null!=t&&null!=e&&null!=e.layers&&(!t.layer&&e.layers._default?n.push({geom:e.layers._default}):!t.layer&&r?n.push({layer:r,geom:e.layers[r]}):"string"==typeof t.layer?n.push({layer:t.layer,geom:e.layers[t.layer]}):Array.isArray(t.layer)&&t.layer.forEach(function(t){e.layers[t]&&e.layers[t].features&&n.push({layer:t,geom:e.layers[t]})})),n}},{key:"abortBuild",value:function(e){if(e.mesh_data)for(var t in e.mesh_data){var r=e.mesh_data[t].textures;r&&r.forEach(function(t){var r=x.default.textures[t];r&&(u.default("trace","releasing texture "+t+" for tile "+e.key),r.release())})}}},{key:"slice",value:function(e,t){var r=["key","loading","loaded","generation","error","debug"];Array.isArray(t)&&r.push.apply(r,i(t));for(var n={},o=0;o<r.length;o++){var a=r[o];n[a]=e[a]}return n}}]),e}();r.default=k,k.coord_children={}},{"./geo":203,"./gl/texture":210,"./labels/collision":216,"./styles/style_parser":247,"./utils/gl-matrix":259,"./utils/log":261,"./utils/merge":263,"./utils/utils":269,"./utils/worker_broker":271}],254:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./tile"),s=n(a),u=e("./tile_pyramid"),l=n(u),c=e("./utils/log"),f=n(c),h=e("./utils/worker_broker"),d=n(h),p=function(){function e(t){var r=t.scene,n=t.view;i(this,e),this.scene=r,this.view=n,this.tiles={},this.pyramid=new l.default,this.visible_coords={},this.queued_coords=[],this.building_tiles=null,this.renderable_tiles=[],this.active_styles=[],this.main_thread_target=["TileManager",this.scene.id].join("_"),d.default.addTarget(this.main_thread_target,this)}return o(e,[{key:"destroy",value:function(){this.forEachTile(function(e){return e.destroy()}),this.tiles={},this.pyramid=null,this.visible_coords={},this.queued_coords=[],this.scene=null,this.view=null}},{key:"keepTile",value:function(e){this.tiles[e.key]=e,this.pyramid.addTile(e)}},{key:"hasTile",value:function(e){return void 0!==this.tiles[e]}},{key:"forgetTile",value:function(e){if(this.hasTile(e)){var t=this.tiles[e];this.pyramid.removeTile(t)}delete this.tiles[e],this.tileBuildStop(e)}},{key:"removeTile",value:function(e){f.default("trace","tile unload for "+e);var t=this.tiles[e];null!=t&&t.destroy(),this.forgetTile(t.key),this.scene.requestRedraw()}},{key:"forEachTile",value:function(e){for(var t in this.tiles)e(this.tiles[t])}},{key:"removeTiles",value:function(e){var t=[];for(var r in this.tiles){var n=this.tiles[r];e(n)&&t.push(r)}for(var i=0;i<t.length;i++){var o=t[i];this.removeTile(o)}}},{key:"updateTilesForView",value:function(){this.visible_coords={};for(var e=this.view.findVisibleTileCoordinates(),t=0;t<e.length;t++){var r=e[t];this.queueCoordinate(r),this.visible_coords[r.key]=r}this.updateTileStates()}},{key:"updateTileStates",value:function(){var e=this;this.forEachTile(function(t){e.updateVisibility(t),t.update()}),this.loadQueuedCoordinates(),this.updateProxyTiles(),this.view.pruneTilesForView(),this.updateRenderableTiles(),this.updateActiveStyles()}},{key:"updateProxyTiles",value:function(){var e=this;if(0!==this.view.zoom_direction){this.forEachTile(function(e){return e.setProxyFor(null)});var t=!1;this.forEachTile(function(r){if(1===e.view.zoom_direction){if(r.visible&&!r.built&&r.coords.z>0){var n=e.pyramid.getAncestor(r);n&&(n.setProxyFor(r),t=!0)}}else if(-1===e.view.zoom_direction&&r.visible&&!r.built)for(var i=e.pyramid.getDescendants(r),o=0;o<i.length;o++)i[o].setProxyFor(r),t=!0}),t||(this.view.zoom_direction=0)}}},{key:"updateVisibility",value:function(e){if(e.visible=!1,e.style_zoom===this.view.tile_zoom)if(this.visible_coords[e.coords.key])e.visible=!0;else for(var t in this.visible_coords)if(s.default.isDescendant(e.coords,this.visible_coords[t])){e.visible=!0;break}}},{key:"pruneToVisibleTiles",value:function(){this.removeTiles(function(e){return!e.visible})}},{key:"getRenderableTiles",value:function(){return this.renderable_tiles}},{key:"updateRenderableTiles",value:function(){this.renderable_tiles=[];for(var e in this.tiles){var t=this.tiles[e];t.visible&&t.loaded&&this.renderable_tiles.push(t)}return this.renderable_tiles}},{key:"getActiveStyles",value:function(){return this.active_styles}},{key:"updateActiveStyles",value:function(){for(var e=this.renderable_tiles,t={},r=0;r<e.length;r++){var n=e[r];Object.keys(n.meshes).forEach(function(e){return t[e]=!0})}return this.active_styles=Object.keys(t),this.active_styles}},{key:"isLoadingVisibleTiles",value:function(){var e=this;return Object.keys(this.tiles).some(function(t){return e.tiles[t].visible&&!e.tiles[t].built})}},{key:"queueCoordinate",value:function(e){this.queued_coords[this.queued_coords.length]=e}},{key:"loadQueuedCoordinates",value:function(){var e=this;0!==this.queued_coords.length&&(this.queued_coords.sort(function(t,r){var n=Math.abs(e.view.center.tile.x-t.x)+Math.abs(e.view.center.tile.y-t.y),i=Math.abs(e.view.center.tile.x-r.x)+Math.abs(e.view.center.tile.y-r.y);return i>n?-1:i===n?0:1}),this.queued_coords.forEach(function(t){return e.loadCoordinate(t)}),this.queued_coords=[])}},{key:"loadCoordinate",value:function(e){if(e.z===this.view.center.tile.z)for(var t in this.scene.sources){var r=this.scene.sources[t];if(r.builds_geometry_tiles&&r.includesTile(e,this.view.tile_zoom)){var n=s.default.key(e,r,this.view.tile_zoom);if(n&&!this.hasTile(n)){var i=s.default.create({source:r,coords:e,worker:this.scene.getWorkerForDataSource(r),style_zoom:this.view.styleZoom(e.z),view:this.view});this.keepTile(i),this.buildTile(i)}}}}},{key:"buildTiles",value:function(e){var t=this;s.default.sort(e).forEach(function(e){return t.buildTile(e)}),this.checkBuildQueue()}},{key:"buildTile",value:function(e,t){this.tileBuildStart(e.key),this.updateVisibility(e),e.update(),e.build(this.scene.generation,t)}},{key:"buildTileStylesCompleted",value:function(e){var t=e.tile,r=e.progress;null==this.tiles[t.key]?(f.default("trace","discarded tile "+t.key+" in TileManager.buildTileStylesCompleted because previously removed"),s.default.abortBuild(t),this.updateTileStates()):t.generation!==this.scene.generation?(f.default("debug","discarded tile "+t.key+" in TileManager.buildTileStylesCompleted because built with "+("scene config gen "+t.generation+", current 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this.building_tiles[e],this.checkBuildQueue())}},{key:"checkBuildQueue",value:function(){this.building_tiles&&0!==Object.keys(this.building_tiles).length||(this.building_tiles=null,this.scene.tileManagerBuildDone())}},{key:"getDebugProp",value:function(e,t){var r=[];for(var n in this.tiles)null==this.tiles[n].debug[e]||"function"==typeof t&&t(this.tiles[n])!==!0||r.push(this.tiles[n].debug[e]);return r}},{key:"getDebugSum",value:function(e,t){var r=0;for(var n in this.tiles)null==this.tiles[n].debug[e]||"function"==typeof t&&t(this.tiles[n])!==!0||(r+=this.tiles[n].debug[e]);return r}},{key:"getDebugAverage",value:function(e,t){return this.getDebugSum(e,t)/Object.keys(this.tiles).length}}]),e}();r.default=p},{"./tile":253,"./tile_pyramid":255,"./utils/log":261,"./utils/worker_broker":271}],255:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return 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function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),s=e("./geo"),u=n(s),l=e("./tile"),c=n(l),f=e("./camera"),h=n(f),d=e("./utils/utils"),p=n(d),_=e("./utils/subscribe"),m=n(_),g=e("./utils/log"),v=n(g),y=r.VIEW_PAN_SNAP_TIME=.5,b=function(){function e(t,r){i(this,e),m.default(this),this.scene=t,this.createMatrices(),this.zoom=null,this.center=null,this.bounds=null,this.meters_per_pixel=null,this.panning=!1,this.panning_stop_at=0,this.pan_snap_timer=0,this.zooming=!1,this.zoom_direction=0,this.size={css:{},device:{},meters:{}},this.aspect=null,this.buffer=0,this.continuous_zoom="boolean"==typeof r.continuousZoom?r.continuousZoom:!0,this.tile_simplification_level=0,this.preserve_tiles_within_zoom=1,this.reset()}return a(e,[{key:"reset",value:function(){this.createCamera()}},{key:"createCamera",value:function(){var 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Date-this.panning_stop_at)/1e3}},{key:"setViewportSize",value:function(e,t){this.size.css={width:e,height:t},this.size.device={width:Math.round(this.size.css.width*p.default.device_pixel_ratio),height:Math.round(this.size.css.height*p.default.device_pixel_ratio)},this.aspect=this.size.css.width/this.size.css.height,this.updateBounds()}},{key:"setView",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.lng,r=e.lat,n=e.zoom,i=!1;return"number"==typeof t&&"number"==typeof r&&(this.center&&t===this.center.lng&&r===this.center.lat||(i=!0,this.center={lng:u.default.wrapLng(t),lat:r})),"number"==typeof n&&n!==this.zoom&&(i=!0,this.setZoom(n)),i&&this.updateBounds(),i}},{key:"setZoom",value:function(e){this.zooming?this.zooming=!1:this.last_zoom=this.zoom;var 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this.zoom?!1:!0}},{key:"updateBounds",value:function(){if(this.ready()){this.meters_per_pixel=u.default.metersPerPixel(this.zoom),this.size.meters={x:this.size.css.width*this.meters_per_pixel,y:this.size.css.height*this.meters_per_pixel};var e=u.default.latLngToMeters([this.center.lng,this.center.lat]),t=o(e,2),r=t[0],n=t[1];this.center.meters={x:r,y:n},this.center.tile=u.default.tileForMeters([this.center.meters.x,this.center.meters.y],this.tile_zoom),this.bounds={sw:{x:this.center.meters.x-this.size.meters.x/2,y:this.center.meters.y-this.size.meters.y/2},ne:{x:this.center.meters.x+this.size.meters.x/2,y:this.center.meters.y+this.size.meters.y/2}},this.scene.tile_manager.updateTilesForView(),this.trigger("move"),this.scene.requestRedraw()}}},{key:"findVisibleTileCoordinates",value:function(){if(!this.bounds)return[];for(var e=this.tile_zoom,t=u.default.tileForMeters([this.bounds.sw.x,this.bounds.sw.y],e),r=u.default.tileForMeters([this.bounds.ne.x,this.bounds.ne.y],e),n=[],i=t.x-this.buffer;i<=r.x+this.buffer;i++)for(var o=r.y-this.buffer;o<=t.y+this.buffer;o++)n.push(c.default.coord({x:i,y:o,z:e}));return n}},{key:"pruneTilesForView",value:function(){var e=this;if(this.ready()){var t=[Math.ceil((Math.floor(this.size.css.width/u.default.tile_size)+2)/2),Math.ceil((Math.floor(this.size.css.height/u.default.tile_size)+2)/2)];this.scene.tile_manager.removeTiles(function(r){if(r.visible||r.proxy_for)return!1;if(r.loading&&r.style_zoom!==e.tile_zoom)return!0;var n=Math.abs(r.style_zoom-e.tile_zoom);if(n>e.preserve_tiles_within_zoom)return!0;var i=c.default.coordinateAtZoom(r.coords,e.tile_zoom);return Math.abs(i.x-e.center.tile.x)-t[0]>e.buffer?(v.default("trace","View: remove tile "+r.key+" (as "+i.x+"/"+i.y+"/"+e.tile_zoom+") for being too far out of visible area 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this.reader.setIndex(r),i},readBlockEndOfCentral:function(){this.diskNumber=this.reader.readInt(2),this.diskWithCentralDirStart=this.reader.readInt(2),this.centralDirRecordsOnThisDisk=this.reader.readInt(2),this.centralDirRecords=this.reader.readInt(2),this.centralDirSize=this.reader.readInt(4),this.centralDirOffset=this.reader.readInt(4),this.zipCommentLength=this.reader.readInt(2);var e=this.reader.readData(this.zipCommentLength),t=s.uint8array?"uint8array":"array",r=i.transformTo(t,e);this.zipComment=this.loadOptions.decodeFileName(r)},readBlockZip64EndOfCentral:function(){this.zip64EndOfCentralSize=this.reader.readInt(8),this.reader.skip(4),this.diskNumber=this.reader.readInt(4),this.diskWithCentralDirStart=this.reader.readInt(4),this.centralDirRecordsOnThisDisk=this.reader.readInt(8),this.centralDirRecords=this.reader.readInt(8),this.centralDirSize=this.reader.readInt(8),this.centralDirOffset=this.reader.readInt(8),this.zip64ExtensibleData={};for(var e,t,r,n=this.zip64EndOfCentralSize-44,i=0;n>i;)e=this.reader.readInt(2),t=this.reader.readInt(4),r=this.reader.readData(t),this.zip64ExtensibleData[e]={id:e,length:t,value:r}},readBlockZip64EndOfCentralLocator:function(){if(this.diskWithZip64CentralDirStart=this.reader.readInt(4),this.relativeOffsetEndOfZip64CentralDir=this.reader.readInt(8),this.disksCount=this.reader.readInt(4),this.disksCount>1)throw new Error("Multi-volumes zip are not supported")},readLocalFiles:function(){var e,t;for(e=0;e<this.files.length;e++)t=this.files[e],this.reader.setIndex(t.localHeaderOffset),this.checkSignature(o.LOCAL_FILE_HEADER),t.readLocalPart(this.reader),t.handleUTF8(),t.processAttributes()},readCentralDir:function(){var e;for(this.reader.setIndex(this.centralDirOffset);this.reader.readAndCheckSignature(o.CENTRAL_FILE_HEADER);)e=new a({zip64:this.zip64},this.loadOptions),e.readCentralPart(this.reader),this.files.push(e);if(this.centralDirRecords!==this.files.length&&0!==this.centralDirRecords&&0===this.files.length)throw new Error("Corrupted zip or bug: expected "+this.centralDirRecords+" records in central dir, got "+this.files.length)},readEndOfCentral:function(){var e=this.reader.lastIndexOfSignature(o.CENTRAL_DIRECTORY_END);if(0>e){var t=!this.isSignature(0,o.LOCAL_FILE_HEADER);throw new Error(t?"Can't find end of central directory : is this a zip file ? If it is, see http://stuk.github.io/jszip/documentation/howto/read_zip.html":"Corrupted zip : can't find end of central directory")}this.reader.setIndex(e);var r=e;if(this.checkSignature(o.CENTRAL_DIRECTORY_END),this.readBlockEndOfCentral(),this.diskNumber===i.MAX_VALUE_16BITS||this.diskWithCentralDirStart===i.MAX_VALUE_16BITS||this.centralDirRecordsOnThisDisk===i.MAX_VALUE_16BITS||this.centralDirRecords===i.MAX_VALUE_16BITS||this.centralDirSize===i.MAX_VALUE_32BITS||this.centralDirOffset===i.MAX_VALUE_32BITS){if(this.zip64=!0,e=this.reader.lastIndexOfSignature(o.ZIP64_CENTRAL_DIRECTORY_LOCATOR),0>e)throw new Error("Corrupted zip : can't find the ZIP64 end of central directory 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bytes.")},prepareReader:function(e){this.reader=n(e)},load:function(e){this.prepareReader(e),this.readEndOfCentral(),this.readCentralDir(),this.readLocalFiles()}},t.exports=r},{"./reader/readerFor":144,"./signature":145,"./support":152,"./utf8":153,"./utils":154,"./zipEntry":156}],156:[function(e,t){"use strict";function r(e,t){this.options=e,this.loadOptions=t}var n=e("./reader/readerFor"),i=e("./utils"),o=e("./compressedObject"),a=e("./crc32"),s=e("./utf8"),u=e("./compressions"),l=e("./support"),c=0,f=3,h=function(e){for(var t in u)if(u.hasOwnProperty(t)&&u[t].magic===e)return u[t];return null};r.prototype={isEncrypted:function(){return 1===(1&this.bitFlag)},useUTF8:function(){return 2048===(2048&this.bitFlag)},readLocalPart:function(e){var t,r;if(e.skip(22),this.fileNameLength=e.readInt(2),r=e.readInt(2),this.fileName=e.readData(this.fileNameLength),e.skip(r),-1===this.compressedSize||-1===this.uncompressedSize)throw new Error("Bug or corrupted zip : didn't get enough informations from the central directory (compressedSize === -1 || uncompressedSize === -1)");if(t=h(this.compressionMethod),null===t)throw new Error("Corrupted zip : compression "+i.pretty(this.compressionMethod)+" unknown (inner file : "+i.transformTo("string",this.fileName)+")");this.decompressed=new o(this.compressedSize,this.uncompressedSize,this.crc32,t,e.readData(this.compressedSize))},readCentralPart:function(e){this.versionMadeBy=e.readInt(2),e.skip(2),this.bitFlag=e.readInt(2),this.compressionMethod=e.readString(2),this.date=e.readDate(),this.crc32=e.readInt(4),this.compressedSize=e.readInt(4),this.uncompressedSize=e.readInt(4);var t=e.readInt(2);if(this.extraFieldsLength=e.readInt(2),this.fileCommentLength=e.readInt(2),this.diskNumberStart=e.readInt(2),this.internalFileAttributes=e.readInt(2),this.externalFileAttributes=e.readInt(4),this.localHeaderOffset=e.readInt(4),this.isEncrypted())throw new Error("Encrypted zip are not supported");e.skip(t),this.readExtraFields(e),this.parseZIP64ExtraField(e),this.fileComment=e.readData(this.fileCommentLength)},processAttributes:function(){this.unixPermissions=null,this.dosPermissions=null;var e=this.versionMadeBy>>8;this.dir=16&this.externalFileAttributes?!0:!1,e===c&&(this.dosPermissions=63&this.externalFileAttributes),e===f&&(this.unixPermissions=this.externalFileAttributes>>16&65535),this.dir||"/"!==this.fileNameStr.slice(-1)||(this.dir=!0)},parseZIP64ExtraField:function(){if(this.extraFields[1]){var e=n(this.extraFields[1].value);this.uncompressedSize===i.MAX_VALUE_32BITS&&(this.uncompressedSize=e.readInt(8)),this.compressedSize===i.MAX_VALUE_32BITS&&(this.compressedSize=e.readInt(8)),this.localHeaderOffset===i.MAX_VALUE_32BITS&&(this.localHeaderOffset=e.readInt(8)),this.diskNumberStart===i.MAX_VALUE_32BITS&&(this.diskNumberStart=e.readInt(4))}},readExtraFields:function(e){var t,r,n,i=e.index+this.extraFieldsLength;for(this.extraFields||(this.extraFields={});e.index<i;)t=e.readInt(2),r=e.readInt(2),n=e.readData(r),this.extraFields[t]={id:t,length:r,value:n}},handleUTF8:function(){var e=l.uint8array?"uint8array":"array";if(this.useUTF8())this.fileNameStr=s.utf8decode(this.fileName),this.fileCommentStr=s.utf8decode(this.fileComment);else{var t=this.findExtraFieldUnicodePath();if(null!==t)this.fileNameStr=t;else{var r=i.transformTo(e,this.fileName);this.fileNameStr=this.loadOptions.decodeFileName(r)}var n=this.findExtraFieldUnicodeComment();if(null!==n)this.fileCommentStr=n;else{var o=i.transformTo(e,this.fileComment);this.fileCommentStr=this.loadOptions.decodeFileName(o)}}},findExtraFieldUnicodePath:function(){var e=this.extraFields[28789];if(e){var t=n(e.value);return 1!==t.readInt(1)?null:a(this.fileName)!==t.readInt(4)?null:s.utf8decode(t.readData(e.length-5))}return null},findExtraFieldUnicodeComment:function(){var e=this.extraFields[25461];if(e){var t=n(e.value);return 1!==t.readInt(1)?null:a(this.fileComment)!==t.readInt(4)?null:s.utf8decode(t.readData(e.length-5))}return null}},t.exports=r},{"./compressedObject":127,"./compressions":128,"./crc32":129,"./reader/readerFor":144,"./support":152,"./utf8":153,"./utils":154}],157:[function(e,t){"use strict";var r=e("./stream/StreamHelper"),n=e("./stream/DataWorker"),i=e("./utf8"),o=e("./compressedObject"),a=e("./stream/GenericWorker"),s=function(e,t,r){this.name=e,this.dir=r.dir,this.date=r.date,this.comment=r.comment,this.unixPermissions=r.unixPermissions,this.dosPermissions=r.dosPermissions,this._data=t,this._dataBinary=r.binary,this.options={compression:r.compression,compressionOptions:r.compressionOptions}};s.prototype={internalStream:function(e){var t=e.toLowerCase(),n="string"===t||"text"===t;("binarystring"===t||"text"===t)&&(t="string");var o=this._decompressWorker(),a=!this._dataBinary;return a&&!n&&(o=o.pipe(new i.Utf8EncodeWorker)),!a&&n&&(o=o.pipe(new i.Utf8DecodeWorker)),new r(o,t,"")},async:function(e,t){return this.internalStream(e).accumulate(t)},nodeStream:function(e,t){return this.internalStream(e||"nodebuffer").toNodejsStream(t)},_decompressWorker:function(){return this._data instanceof o?this._data.getContentWorker():this._data instanceof a?this._data:new n(this._data)}};for(var u=["asText","asBinary","asNodeBuffer","asUint8Array","asArrayBuffer"],l=function(){throw new Error("This method has been removed in JSZip 3.0, please check the upgrade guide.")},c=0;c<u.length;c++)s.prototype[u[c]]=l;t.exports=s},{"./compressedObject":127,"./stream/DataWorker":149,"./stream/GenericWorker":150,"./stream/StreamHelper":151,"./utf8":153}],158:[function(e,t){"use strict";function r(e){return this instanceof r?(u.call(this,e),l.call(this,e),e&&e.readable===!1&&(this.readable=!1),e&&e.writable===!1&&(this.writable=!1),this.allowHalfOpen=!0,e&&e.allowHalfOpen===!1&&(this.allowHalfOpen=!1),void this.once("end",n)):new r(e)}function 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e.insert=0,t===F?(s(e,!0),0===e.strm.avail_out?wt:kt):e.last_lit&&(s(e,!1),0===e.strm.avail_out)?bt:xt}function v(e,t,r,n,i){this.good_length=e,this.max_lazy=t,this.nice_length=r,this.max_chain=n,this.func=i}function y(e){e.window_size=2*e.w_size,o(e.head),e.max_lazy_match=M[e.level].max_lazy,e.good_match=M[e.level].good_length,e.nice_match=M[e.level].nice_length,e.max_chain_length=M[e.level].max_chain,e.strstart=0,e.block_start=0,e.lookahead=0,e.insert=0,e.match_length=e.prev_length=lt-1,e.match_available=0,e.ins_h=0}function 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O.Buf16(2*it+1),o(this.depth),this.l_buf=0,this.lit_bufsize=0,this.last_lit=0,this.d_buf=0,this.opt_len=0,this.static_len=0,this.matches=0,this.insert=0,this.bi_buf=0,this.bi_valid=0}function x(e){var t;return e&&e.state?(e.total_in=e.total_out=0,e.data_type=K,t=e.state,t.pending=0,t.pending_out=0,t.wrap<0&&(t.wrap=-t.wrap),t.status=t.wrap?dt:vt,e.adler=2===t.wrap?0:1,t.last_flush=j,P._tr_init(t),D):n(e,G)}function w(e){var t=x(e);return t===D&&y(e.state),t}function k(e,t){return e&&e.state?2!==e.state.wrap?G:(e.state.gzhead=t,D):G}function A(e,t,r,i,o,a){if(!e)return G;var s=1;if(t===W&&(t=6),0>i?(s=0,i=-i):i>15&&(s=2,i-=16),1>o||o>Q||r!==$||8>i||i>15||0>t||t>9||0>a||a>Y)return n(e,G);8===i&&(i=9);var u=new b;return e.state=u,u.strm=e,u.wrap=s,u.gzhead=null,u.w_bits=i,u.w_size=1<<u.w_bits,u.w_mask=u.w_size-1,u.hash_bits=o+7,u.hash_size=1<<u.hash_bits,u.hash_mask=u.hash_size-1,u.hash_shift=~~((u.hash_bits+lt-1)/lt),u.window=new O.Buf8(2*u.w_size),u.head=new O.Buf16(u.hash_size),u.prev=new O.Buf16(u.w_size),u.lit_bufsize=1<<o+6,u.pending_buf_size=4*u.lit_bufsize,u.pending_buf=new O.Buf8(u.pending_buf_size),u.d_buf=1*u.lit_bufsize,u.l_buf=3*u.lit_bufsize,u.level=t,u.strategy=a,u.method=r,w(e)}function T(e,t){return A(e,t,$,et,tt,J)}function E(e,t){var r,s,c,f;if(!e||!e.state||t>U||0>t)return e?n(e,G):G;if(s=e.state,!e.output||!e.input&&0!==e.avail_in||s.status===yt&&t!==F)return n(e,0===e.avail_out?q:G);if(s.strm=e,r=s.last_flush,s.last_flush=t,s.status===dt)if(2===s.wrap)e.adler=0,u(s,31),u(s,139),u(s,8),s.gzhead?(u(s,(s.gzhead.text?1:0)+(s.gzhead.hcrc?2:0)+(s.gzhead.extra?4:0)+(s.gzhead.name?8:0)+(s.gzhead.comment?16:0)),u(s,255&s.gzhead.time),u(s,s.gzhead.time>>8&255),u(s,s.gzhead.time>>16&255),u(s,s.gzhead.time>>24&255),u(s,9===s.level?2:s.strategy>=H||s.level<2?4:0),u(s,255&s.gzhead.os),s.gzhead.extra&&s.gzhead.extra.length&&(u(s,255&s.gzhead.extra.length),u(s,s.gzhead.extra.length>>8&255)),s.gzhead.hcrc&&(e.adler=L(e.adler,s.pending_buf,s.pending,0)),s.gzindex=0,s.status=pt):(u(s,0),u(s,0),u(s,0),u(s,0),u(s,0),u(s,9===s.level?2:s.strategy>=H||s.level<2?4:0),u(s,At),s.status=vt);else{var h=$+(s.w_bits-8<<4)<<8,d=-1;d=s.strategy>=H||s.level<2?0:s.level<6?1:6===s.level?2:3,h|=d<<6,0!==s.strstart&&(h|=ht),h+=31-h%31,s.status=vt,l(s,h),0!==s.strstart&&(l(s,e.adler>>>16),l(s,65535&e.adler)),e.adler=1}if(s.status===pt)if(s.gzhead.extra){for(c=s.pending;s.gzindex<(65535&s.gzhead.extra.length)&&(s.pending!==s.pending_buf_size||(s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),a(e),c=s.pending,s.pending!==s.pending_buf_size));)u(s,255&s.gzhead.extra[s.gzindex]),s.gzindex++;s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),s.gzindex===s.gzhead.extra.length&&(s.gzindex=0,s.status=_t)}else s.status=_t;if(s.status===_t)if(s.gzhead.name){c=s.pending;do{if(s.pending===s.pending_buf_size&&(s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),a(e),c=s.pending,s.pending===s.pending_buf_size)){f=1;break}f=s.gzindex<s.gzhead.name.length?255&s.gzhead.name.charCodeAt(s.gzindex++):0,u(s,f)}while(0!==f);s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),0===f&&(s.gzindex=0,s.status=mt)}else s.status=mt;if(s.status===mt)if(s.gzhead.comment){c=s.pending;do{if(s.pending===s.pending_buf_size&&(s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),a(e),c=s.pending,s.pending===s.pending_buf_size)){f=1;break}f=s.gzindex<s.gzhead.comment.length?255&s.gzhead.comment.charCodeAt(s.gzindex++):0,u(s,f)}while(0!==f);s.gzhead.hcrc&&s.pending>c&&(e.adler=L(e.adler,s.pending_buf,s.pending-c,c)),0===f&&(s.status=gt)}else s.status=gt;if(s.status===gt&&(s.gzhead.hcrc?(s.pending+2>s.pending_buf_size&&a(e),s.pending+2<=s.pending_buf_size&&(u(s,255&e.adler),u(s,e.adler>>8&255),e.adler=0,s.status=vt)):s.status=vt),0!==s.pending){if(a(e),0===e.avail_out)return s.last_flush=-1,D}else if(0===e.avail_in&&i(t)<=i(r)&&t!==F)return n(e,q);if(s.status===yt&&0!==e.avail_in)return n(e,q);if(0!==e.avail_in||0!==s.lookahead||t!==j&&s.status!==yt){var p=s.strategy===H?g(s,t):s.strategy===X?m(s,t):M[s.level].func(s,t);if((p===wt||p===kt)&&(s.status=yt),p===bt||p===wt)return 0===e.avail_out&&(s.last_flush=-1),D;if(p===xt&&(t===I?P._tr_align(s):t!==U&&(P._tr_stored_block(s,0,0,!1),t===C&&(o(s.head),0===s.lookahead&&(s.strstart=0,s.block_start=0,s.insert=0))),a(e),0===e.avail_out))return s.last_flush=-1,D}return t!==F?D:s.wrap<=0?B:(2===s.wrap?(u(s,255&e.adler),u(s,e.adler>>8&255),u(s,e.adler>>16&255),u(s,e.adler>>24&255),u(s,255&e.total_in),u(s,e.total_in>>8&255),u(s,e.total_in>>16&255),u(s,e.total_in>>24&255)):(l(s,e.adler>>>16),l(s,65535&e.adler)),a(e),s.wrap>0&&(s.wrap=-s.wrap),0!==s.pending?D:B)}function S(e){var t;return e&&e.state?(t=e.state.status,t!==dt&&t!==pt&&t!==_t&&t!==mt&&t!==gt&&t!==vt&&t!==yt?n(e,G):(e.state=null,t===vt?n(e,V):D)):G}function R(e,t){var r,n,i,a,s,u,l,c,f=t.length;if(!e||!e.state)return G;if(r=e.state,a=r.wrap,2===a||1===a&&r.status!==dt||r.lookahead)return G;for(1===a&&(e.adler=z(e.adler,t,f,0)),r.wrap=0,f>=r.w_size&&(0===a&&(o(r.head),r.strstart=0,r.block_start=0,r.insert=0),c=new O.Buf8(r.w_size),O.arraySet(c,t,f-r.w_size,r.w_size,0),t=c,f=r.w_size),s=e.avail_in,u=e.next_in,l=e.input,e.avail_in=f,e.next_in=0,e.input=t,h(r);r.lookahead>=lt;){n=r.strstart,i=r.lookahead-(lt-1);do r.ins_h=(r.ins_h<<r.hash_shift^r.window[n+lt-1])&r.hash_mask,r.prev[n&r.w_mask]=r.head[r.ins_h],r.head[r.ins_h]=n,n++;while(--i);r.strstart=n,r.lookahead=lt-1,h(r)}return r.strstart+=r.lookahead,r.block_start=r.strstart,r.insert=r.lookahead,r.lookahead=0,r.match_length=r.prev_length=lt-1,r.match_available=0,e.next_in=u,e.input=l,e.avail_in=s,r.wrap=a,D}var M,O=e("../utils/common"),P=e("./trees"),z=e("./adler32"),L=e("./crc32"),N=e("./messages"),j=0,I=1,C=3,F=4,U=5,D=0,B=1,G=-2,V=-3,q=-5,W=-1,Z=1,H=2,X=3,Y=4,J=0,K=2,$=8,Q=9,et=15,tt=8,rt=29,nt=256,it=nt+1+rt,ot=30,at=19,st=2*it+1,ut=15,lt=3,ct=258,ft=ct+lt+1,ht=32,dt=42,pt=69,_t=73,mt=91,gt=103,vt=113,yt=666,bt=1,xt=2,wt=3,kt=4,At=3;M=[new v(0,0,0,0,d),new v(4,4,8,4,p),new v(4,5,16,8,p),new v(4,6,32,32,p),new v(4,4,16,16,_),new v(8,16,32,32,_),new v(8,16,128,128,_),new v(8,32,128,256,_),new v(32,128,258,1024,_),new v(32,258,258,4096,_)],r.deflateInit=T,r.deflateInit2=A,r.deflateReset=w,r.deflateResetKeep=x,r.deflateSetHeader=k,r.deflate=E,r.deflateEnd=S,r.deflateSetDictionary=R,r.deflateInfo="pako deflate (from Nodeca project)"},{"../utils/common":167,"./adler32":169,"./crc32":171,"./messages":177,"./trees":178}],173:[function(e,t){"use strict";
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R[s++]=R[T++],R[s++]=R[T++],R[s++]=R[T++],k-=3;while(k>2);k&&(R[s++]=R[T++],k>1&&(R[s++]=R[T++]))}break}}break}}while(a>o&&l>s);k=m>>3,o-=k,m-=k<<3,_&=(1<<m)-1,e.next_in=o,e.next_out=s,e.avail_in=a>o?5+(a-o):5-(o-a),e.avail_out=l>s?257+(l-s):257-(s-l),i.hold=_,i.bits=m}},{}],175:[function(e,t,r){"use strict";function n(e){return(e>>>24&255)+(e>>>8&65280)+((65280&e)<<8)+((255&e)<<24)}function i(){this.mode=0,this.last=!1,this.wrap=0,this.havedict=!1,this.flags=0,this.dmax=0,this.check=0,this.total=0,this.head=null,this.wbits=0,this.wsize=0,this.whave=0,this.wnext=0,this.window=null,this.hold=0,this.bits=0,this.length=0,this.offset=0,this.extra=0,this.lencode=null,this.distcode=null,this.lenbits=0,this.distbits=0,this.ncode=0,this.nlen=0,this.ndist=0,this.have=0,this.next=null,this.lens=new v.Buf16(320),this.work=new v.Buf16(288),this.lendyn=null,this.distdyn=null,this.sane=0,this.back=0,this.was=0}function o(e){var t;return e&&e.state?(t=e.state,e.total_in=e.total_out=t.total=0,e.msg="",t.wrap&&(e.adler=1&t.wrap),t.mode=C,t.last=0,t.havedict=0,t.dmax=32768,t.head=null,t.hold=0,t.bits=0,t.lencode=t.lendyn=new v.Buf32(_t),t.distcode=t.distdyn=new v.Buf32(mt),t.sane=1,t.back=-1,M):z}function a(e){var t;return e&&e.state?(t=e.state,t.wsize=0,t.whave=0,t.wnext=0,o(e)):z}function s(e,t){var r,n;return e&&e.state?(n=e.state,0>t?(r=0,t=-t):(r=(t>>4)+1,48>t&&(t&=15)),t&&(8>t||t>15)?z:(null!==n.window&&n.wbits!==t&&(n.window=null),n.wrap=r,n.wbits=t,a(e))):z}function u(e,t){var r,n;return e?(n=new i,e.state=n,n.window=null,r=s(e,t),r!==M&&(e.state=null),r):z}function l(e){return u(e,vt)}function c(e){if(yt){var t;for(m=new v.Buf32(512),g=new 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z;r=e.state,r.mode===X&&(r.mode=Y),s=e.next_out,o=e.output,l=e.avail_out,a=e.next_in,i=e.input,u=e.avail_in,h=r.hold,d=r.bits,p=u,_=l,kt=M;e:for(;;)switch(r.mode){case C:if(0===r.wrap){r.mode=Y;break}for(;16>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(2&r.wrap&&35615===h){r.check=0,St[0]=255&h,St[1]=h>>>8&255,r.check=b(r.check,St,2,0),h=0,d=0,r.mode=F;break}if(r.flags=0,r.head&&(r.head.done=!1),!(1&r.wrap)||(((255&h)<<8)+(h>>8))%31){e.msg="incorrect header check",r.mode=ht;break}if((15&h)!==I){e.msg="unknown compression method",r.mode=ht;break}if(h>>>=4,d-=4,wt=(15&h)+8,0===r.wbits)r.wbits=wt;else if(wt>r.wbits){e.msg="invalid window size",r.mode=ht;break}r.dmax=1<<wt,e.adler=r.check=1,r.mode=512&h?Z:X,h=0,d=0;break;case F:for(;16>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(r.flags=h,(255&r.flags)!==I){e.msg="unknown compression method",r.mode=ht;break}if(57344&r.flags){e.msg="unknown header flags 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e;u--,h+=i[a++]<<d,d+=8}e.adler=r.check=n(h),h=0,d=0,r.mode=H;case H:if(0===r.havedict)return e.next_out=s,e.avail_out=l,e.next_in=a,e.avail_in=u,r.hold=h,r.bits=d,P;e.adler=r.check=1,r.mode=X;case X:if(t===S||t===R)break e;case Y:if(r.last){h>>>=7&d,d-=7&d,r.mode=lt;break}for(;3>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}switch(r.last=1&h,h>>>=1,d-=1,3&h){case 0:r.mode=J;break;case 1:if(c(r),r.mode=rt,t===R){h>>>=2,d-=2;break e}break;case 2:r.mode=Q;break;case 3:e.msg="invalid block type",r.mode=ht}h>>>=2,d-=2;break;case J:for(h>>>=7&d,d-=7&d;32>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if((65535&h)!==(h>>>16^65535)){e.msg="invalid stored block lengths",r.mode=ht;break}if(r.length=65535&h,h=0,d=0,r.mode=K,t===R)break e;case K:r.mode=$;case $:if(m=r.length){if(m>u&&(m=u),m>l&&(m=l),0===m)break e;v.arraySet(o,i,a,m,s),u-=m,a+=m,l-=m,s+=m,r.length-=m;break}r.mode=X;break;case Q:for(;14>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(r.nlen=(31&h)+257,h>>>=5,d-=5,r.ndist=(31&h)+1,h>>>=5,d-=5,r.ncode=(15&h)+4,h>>>=4,d-=4,r.nlen>286||r.ndist>30){e.msg="too many length or distance symbols",r.mode=ht;break}r.have=0,r.mode=et;case et:for(;r.have<r.ncode;){for(;3>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.lens[Rt[r.have++]]=7&h,h>>>=3,d-=3}for(;r.have<19;)r.lens[Rt[r.have++]]=0;if(r.lencode=r.lendyn,r.lenbits=7,At={bits:r.lenbits},kt=w(k,r.lens,0,19,r.lencode,0,r.work,At),r.lenbits=At.bits,kt){e.msg="invalid code lengths set",r.mode=ht;break}r.have=0,r.mode=tt;case tt:for(;r.have<r.nlen+r.ndist;){for(;Et=r.lencode[h&(1<<r.lenbits)-1],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(16>vt)h>>>=mt,d-=mt,r.lens[r.have++]=vt;else{if(16===vt){for(Tt=mt+2;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(h>>>=mt,d-=mt,0===r.have){e.msg="invalid bit length repeat",r.mode=ht;break}wt=r.lens[r.have-1],m=3+(3&h),h>>>=2,d-=2}else if(17===vt){for(Tt=mt+3;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=mt,d-=mt,wt=0,m=3+(7&h),h>>>=3,d-=3}else{for(Tt=mt+7;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=mt,d-=mt,wt=0,m=11+(127&h),h>>>=7,d-=7}if(r.have+m>r.nlen+r.ndist){e.msg="invalid bit length repeat",r.mode=ht;break}for(;m--;)r.lens[r.have++]=wt}}if(r.mode===ht)break;if(0===r.lens[256]){e.msg="invalid code -- missing end-of-block",r.mode=ht;break}if(r.lenbits=9,At={bits:r.lenbits},kt=w(A,r.lens,0,r.nlen,r.lencode,0,r.work,At),r.lenbits=At.bits,kt){e.msg="invalid literal/lengths set",r.mode=ht;break}if(r.distbits=6,r.distcode=r.distdyn,At={bits:r.distbits},kt=w(T,r.lens,r.nlen,r.ndist,r.distcode,0,r.work,At),r.distbits=At.bits,kt){e.msg="invalid distances set",r.mode=ht;break}if(r.mode=rt,t===R)break e;case rt:r.mode=nt;case nt:if(u>=6&&l>=258){e.next_out=s,e.avail_out=l,e.next_in=a,e.avail_in=u,r.hold=h,r.bits=d,x(e,_),s=e.next_out,o=e.output,l=e.avail_out,a=e.next_in,i=e.input,u=e.avail_in,h=r.hold,d=r.bits,r.mode===X&&(r.back=-1);break}for(r.back=0;Et=r.lencode[h&(1<<r.lenbits)-1],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(gt&&0===(240&gt)){for(yt=mt,bt=gt,xt=vt;Et=r.lencode[xt+((h&(1<<yt+bt)-1)>>yt)],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=yt+mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=yt,d-=yt,r.back+=yt}if(h>>>=mt,d-=mt,r.back+=mt,r.length=vt,0===gt){r.mode=ut;break}if(32&gt){r.back=-1,r.mode=X;break}if(64&gt){e.msg="invalid literal/length code",r.mode=ht;break}r.extra=15&gt,r.mode=it;case it:if(r.extra){for(Tt=r.extra;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.length+=h&(1<<r.extra)-1,h>>>=r.extra,d-=r.extra,r.back+=r.extra}r.was=r.length,r.mode=ot;case ot:for(;Et=r.distcode[h&(1<<r.distbits)-1],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(0===(240&gt)){for(yt=mt,bt=gt,xt=vt;Et=r.distcode[xt+((h&(1<<yt+bt)-1)>>yt)],mt=Et>>>24,gt=Et>>>16&255,vt=65535&Et,!(d>=yt+mt);){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}h>>>=yt,d-=yt,r.back+=yt}if(h>>>=mt,d-=mt,r.back+=mt,64&gt){e.msg="invalid distance code",r.mode=ht;break}r.offset=vt,r.extra=15&gt,r.mode=at;case at:if(r.extra){for(Tt=r.extra;Tt>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}r.offset+=h&(1<<r.extra)-1,h>>>=r.extra,d-=r.extra,r.back+=r.extra}if(r.offset>r.dmax){e.msg="invalid distance too far back",r.mode=ht;break}r.mode=st;case st:if(0===l)break e;if(m=_-l,r.offset>m){if(m=r.offset-m,m>r.whave&&r.sane){e.msg="invalid distance too far back",r.mode=ht;break}m>r.wnext?(m-=r.wnext,g=r.wsize-m):g=r.wnext-m,m>r.length&&(m=r.length),_t=r.window}else _t=o,g=s-r.offset,m=r.length;m>l&&(m=l),l-=m,r.length-=m;do o[s++]=_t[g++];while(--m);0===r.length&&(r.mode=nt);break;case ut:if(0===l)break e;o[s++]=r.length,l--,r.mode=nt;break;case lt:if(r.wrap){for(;32>d;){if(0===u)break e;u--,h|=i[a++]<<d,d+=8}if(_-=l,e.total_out+=_,r.total+=_,_&&(e.adler=r.check=r.flags?b(r.check,o,_,s-_):y(r.check,o,_,s-_)),_=l,(r.flags?h:n(h))!==r.check){e.msg="incorrect data check",r.mode=ht;break}h=0,d=0}r.mode=ct;case ct:if(r.wrap&&r.flags){for(;32>d;){if(0===u)break e;u--,h+=i[a++]<<d,d+=8}if(h!==(4294967295&r.total)){e.msg="incorrect length check",r.mode=ht;break}h=0,d=0}r.mode=ft;case ft:kt=O;break e;case ht:kt=L;break e;case dt:return N;case pt:default:return z}return e.next_out=s,e.avail_out=l,e.next_in=a,e.avail_in=u,r.hold=h,r.bits=d,(r.wsize||_!==e.avail_out&&r.mode<ht&&(r.mode<lt||t!==E))&&f(e,e.output,e.next_out,_-e.avail_out)?(r.mode=dt,N):(p-=e.avail_in,_-=e.avail_out,e.total_in+=p,e.total_out+=_,r.total+=_,r.wrap&&_&&(e.adler=r.check=r.flags?b(r.check,o,_,e.next_out-_):y(r.check,o,_,e.next_out-_)),e.data_type=r.bits+(r.last?64:0)+(r.mode===X?128:0)+(r.mode===rt||r.mode===K?256:0),(0===p&&0===_||t===E)&&kt===M&&(kt=j),kt)}function d(e){if(!e||!e.state)return z;var t=e.state;return t.window&&(t.window=null),e.state=null,M}function p(e,t){var r;return e&&e.state?(r=e.state,0===(2&r.wrap)?z:(r.head=t,t.done=!1,M)):z}function _(e,t){var r,n,i,o=t.length;return e&&e.state?(r=e.state,0!==r.wrap&&r.mode!==H?z:r.mode===H&&(n=1,n=y(n,t,o,0),n!==r.check)?L:(i=f(e,t,o,o))?(r.mode=dt,N):(r.havedict=1,M)):z}var m,g,v=e("../utils/common"),y=e("./adler32"),b=e("./crc32"),x=e("./inffast"),w=e("./inftrees"),k=0,A=1,T=2,E=4,S=5,R=6,M=0,O=1,P=2,z=-2,L=-3,N=-4,j=-5,I=8,C=1,F=2,U=3,D=4,B=5,G=6,V=7,q=8,W=9,Z=10,H=11,X=12,Y=13,J=14,K=15,$=16,Q=17,et=18,tt=19,rt=20,nt=21,it=22,ot=23,at=24,st=25,ut=26,lt=27,ct=28,ft=29,ht=30,dt=31,pt=32,_t=852,mt=592,gt=15,vt=gt,yt=!0;r.inflateReset=a,r.inflateReset2=s,r.inflateResetKeep=o,r.inflateInit=l,r.inflateInit2=u,r.inflate=h,r.inflateEnd=d,r.inflateGetHeader=p,r.inflateSetDictionary=_,r.inflateInfo="pako inflate (from Nodeca project)"},{"../utils/common":167,"./adler32":169,"./crc32":171,"./inffast":174,"./inftrees":176}],176:[function(e,t){"use strict";var r=e("../utils/common"),n=15,i=852,o=592,a=0,s=1,u=2,l=[3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0],c=[16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,72,78],f=[1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0],h=[16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64];t.exports=function(e,t,d,p,_,m,g,v){var y,b,x,w,k,A,T,E,S,R=v.bits,M=0,O=0,P=0,z=0,L=0,N=0,j=0,I=0,C=0,F=0,U=null,D=0,B=new r.Buf16(n+1),G=new r.Buf16(n+1),V=null,q=0;for(M=0;n>=M;M++)B[M]=0;for(O=0;p>O;O++)B[t[d+O]]++;for(L=R,z=n;z>=1&&0===B[z];z--);if(L>z&&(L=z),0===z)return _[m++]=20971520,_[m++]=20971520,v.bits=1,0;for(P=1;z>P&&0===B[P];P++);for(P>L&&(L=P),I=1,M=1;n>=M;M++)if(I<<=1,I-=B[M],0>I)return-1;if(I>0&&(e===a||1!==z))return-1;for(G[1]=0,M=1;n>M;M++)G[M+1]=G[M]+B[M];for(O=0;p>O;O++)0!==t[d+O]&&(g[G[t[d+O]]++]=O);if(e===a?(U=V=g,A=19):e===s?(U=l,D-=257,V=c,q-=257,A=256):(U=f,V=h,A=-1),F=0,O=0,M=P,k=m,N=L,j=0,x=-1,C=1<<L,w=C-1,e===s&&C>i||e===u&&C>o)return 1;for(var W=0;;){W++,T=M-j,g[O]<A?(E=0,S=g[O]):g[O]>A?(E=V[q+g[O]],S=U[D+g[O]]):(E=96,S=0),y=1<<M-j,b=1<<N,P=b;do b-=y,_[k+(F>>j)+b]=T<<24|E<<16|S|0;while(0!==b);for(y=1<<M-1;F&y;)y>>=1;if(0!==y?(F&=y-1,F+=y):F=0,O++,0===--B[M]){if(M===z)break;M=t[d+g[O]]}if(M>L&&(F&w)!==x){for(0===j&&(j=L),k+=P,N=M-j,I=1<<N;z>N+j&&(I-=B[N+j],!(0>=I));)N++,I<<=1;if(C+=1<<N,e===s&&C>i||e===u&&C>o)return 1;x=F&w,_[x]=L<<24|N<<16|k-m|0}}return 0!==F&&(_[k+F]=M-j<<24|64<<16|0),v.bits=L,0}},{"../utils/common":167}],177:[function(e,t){"use strict";t.exports={2:"need dictionary",1:"stream end",0:"","-1":"file 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e=this.view.size.css.height*this.view.meters_per_pixel,t=this.constrainCamera({view_height:e,focal_length:c.default.interpolate(this.view.zoom,this.focal_length),fov:c.default.interpolate(this.view.zoom,this.fov)}),r=t.height,n=t.fov,i=[this.view.center.meters.x,this.view.center.meters.y,r];this.position_meters=i,d.mat4.lookAt(this.view_matrix,d.vec3.fromValues(i[0],i[1],0),d.vec3.fromValues(i[0],i[1],-1),d.vec3.fromValues(0,1,0)),d.mat4.perspective(this.projection_matrix,n,this.view.aspect,1,2*r),this.vanishing_point_skew[0]=this.vanishing_point[0]/this.view.size.css.width,this.vanishing_point_skew[1]=this.vanishing_point[1]/this.view.size.css.height,this.projection_matrix[8]=2*-this.vanishing_point_skew[0],this.projection_matrix[9]=2*-this.vanishing_point_skew[1],d.mat4.translate(this.projection_matrix,this.projection_matrix,d.vec3.fromValues(e/2*this.view.aspect*2*-this.vanishing_point_skew[0],e/2*2*-this.vanishing_point_skew[1],0)),d.mat4.translate(this.projection_matrix,this.projection_matrix,d.vec3.fromValues(0,0,-r))}},{key:"update",value:function(){s(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"update",this).call(this),this.updateMatrices()}},{key:"setupProgram",value:function(e){e.uniform("Matrix4fv","u_projection",this.projection_matrix),e.uniform("3f","u_eye",[0,0,this.position_meters[2]]),e.uniform("2fv","u_vanishing_point",this.vanishing_point_skew)}}]),t}(p),m=function(e){function t(e,r){var n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};a(this,t);var o=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r,n));return o.type="isometric",o.axis=n.axis||{x:0,y:1},2===o.axis.length&&(o.axis={x:o.axis[0],y:o.axis[1]}),o.position_meters=null,o.viewport_height=null,o.view_matrix=new Float64Array(16),o.projection_matrix=new Float32Array(16),h.default.replaceBlock("camera","\n            uniform mat4 u_projection;\n            uniform vec3 u_eye;\n            uniform vec2 u_vanishing_point;\n\n            void cameraProjection (inout vec4 position) {\n                position = u_projection * position;\n                // position.xy += position.z * u_isometric_axis;\n\n                // Reverse z for depth buffer so up is negative,\n                // and scale down values so objects higher than one screen height will not get clipped\n                // pull forward slightly to avoid going past far clipping plane\n                position.z = 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e=[this.view.center.meters.x,this.view.center.meters.y,this.viewport_height];this.position_meters=e,d.mat4.identity(this.view_matrix),d.mat4.translate(this.view_matrix,this.view_matrix,d.vec3.fromValues(-e[0],-e[1],0)),d.mat4.identity(this.projection_matrix),this.projection_matrix[8]=this.axis.x/this.view.aspect,this.projection_matrix[9]=this.axis.y,d.mat4.scale(this.projection_matrix,this.projection_matrix,d.vec3.fromValues(2/this.view.size.meters.x,2/this.view.size.meters.y,2/this.view.size.meters.y))}},{key:"setupProgram",value:function(e){e.uniform("Matrix4fv","u_projection",this.projection_matrix),e.uniform("3fv","u_eye",[0,0,this.viewport_height]),e.uniform("2fv","u_vanishing_point",[0,0])}}]),t}(p),g=function(e){function t(e,r){var n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};a(this,t);var o=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r,n));return o.type="flat",o}return 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r=arguments.length,n=Array(r>1?r-1:0),i=1;r>i;i++)n[i-1]=arguments[i];(t=k.blocks[e]).push.apply(t,n)},k.removeBlock=function(e){k.blocks[e]=[]},k.replaceBlock=function(e){k.removeBlock(e);for(var t=arguments.length,r=Array(t>1?t-1:0),n=1;t>n;n++)r[n-1]=arguments[n];k.addBlock.apply(k,[e].concat(r))},k.updateProgram=function(e,t,r,n){var i=m.default(e._tangram_id+"::"+r+"::"+n);if(k.programs_by_source[i])return u.default("trace","Reusing identical source GL program object"),k.programs_by_source[i];try{var o=k.createShader(e,r,e.VERTEX_SHADER),a=k.createShader(e,n,e.FRAGMENT_SHADER)}catch(s){throw u.default("error",s.message),s}if(e.useProgram(null),null!=t)for(var l=e.getAttachedShaders(t),c=0;c<l.length;c++)e.detachShader(t,l[c]);else t=e.createProgram();if(null==o||null==a)return t;if(e.attachShader(t,o),e.attachShader(t,a),e.linkProgram(t),!e.getProgramParameter(t,e.LINK_STATUS)){var f=new Error("WebGL program error:\n            VALIDATE_STATUS: "+e.getProgramParameter(t,e.VALIDATE_STATUS)+"\n            ERROR: "+e.getError()+"\n            --- Vertex Shader ---\n            "+r+"\n            --- Fragment Shader ---\n            "+n),h={type:"program",message:f};throw u.default("error",h.message),h}return k.programs_by_source[i]=t,t},k.createShader=function(e,t,r){var n=m.default(e._tangram_id+"::"+t);if(k.shaders_by_source[n])return u.default("trace","Reusing identical source GL shader object"),k.shaders_by_source[n];var i=e.createShader(r);if(e.shaderSource(i,t),e.compileShader(i),!e.getShaderParameter(i,e.COMPILE_STATUS)){var o=r===e.VERTEX_SHADER?"vertex":"fragment",a=e.getShaderInfoLog(i),s=b.default(a);throw{type:o,message:a,errors:s}}return k.shaders_by_source[n]=i,i}},{"../utils/hash":258,"../utils/log":259,"./extensions":204,"./glsl":205,"./texture":208,"gl-shader-errors":92,"strip-comments":186}],208:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("../utils/log"),s=n(a),u=e("../utils/utils"),l=n(u),c=e("../utils/subscribe"),f=n(c),h=e("../utils/worker_broker"),d=n(h),p=function(){function e(t,r){var n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};i(this,e),this.gl=t,this.texture=t.createTexture(),this.texture&&(this.valid=!0),this.bind(),this.name=r,this.retain_count=0,this.config_type=null,this.loading=null,this.loaded=!1,this.filtering=n.filtering,this.sprites=n.sprites,this.texcoords={},this.sizes={},this.setData(1,1,new Uint8Array([0,0,0,255]),{filtering:"nearest"}),e.textures[this.name]&&(this.retain_count=e.textures[this.name].retain_count,e.textures[this.name].retain_count=0,e.textures[this.name].destroy()),e.textures[this.name]=this,e.texture_configs[this.name]=JSON.stringify(Object.assign({name:r},n)),this.load(n),s.default("trace","creating Texture "+this.name)}return o(e,[{key:"destroy",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},r=t.force;return this.retain_count>0&&!r?void s.default("error","Texture '"+this.name+"': destroying texture with retain count of '"+this.retain_count+"'"):void(this.valid&&(this.gl.deleteTexture(this.texture),this.texture=null,delete this.data,this.data=null,delete e.textures[this.name],delete e.texture_configs[this.name],this.valid=!1,s.default("trace","destroying Texture "+this.name)))}},{key:"retain",value:function(){this.retain_count++}},{key:"release",value:function(){this.retain_count<=0&&s.default("error","Texture 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0!==arguments[1]?arguments[1]:{};return this.valid?(this.url=t,this.loading=new Promise(function(t){var i=new Image;i.onload=function(){try{r.setElement(i,n)}catch(o){r.loaded=!1,s.default("warn","Texture '"+r.name+"': failed to load url: '"+r.url+"'",o,n),e.trigger("warning",{message:"Failed to load texture from "+r.url,error:o,texture:n})}r.loaded=!0,t(r)},i.onerror=function(i){r.loaded=!1,s.default("warn","Texture '"+r.name+"': failed to load url: '"+r.url+"'",i,n),e.trigger("warning",{message:"Failed to load texture from "+r.url,error:i,texture:n}),t(r)},l.default.isSafari()&&"data:"===r.url.slice(0,5)||(i.crossOrigin="anonymous"),i.src=r.url}),this.loading):void 0}},{key:"setData",value:function(e,t,r){var n=arguments.length>3&&void 0!==arguments[3]?arguments[3]:{};return this.width=e,this.height=t,Array.isArray(r)&&(r=new Uint8Array(r)),this.update(r,n),this.setFiltering(n),this.loaded=!0,this.loading=Promise.resolve(this),this.loading}},{key:"setElement",value:function(t,r){var n=t;if("string"==typeof t&&(t=document.querySelector(t)),t instanceof HTMLCanvasElement||t instanceof HTMLImageElement||t instanceof HTMLVideoElement)this.update(t,r),this.setFiltering(r);else{this.loaded=!1;var i="the 'element' parameter (`element: "+JSON.stringify(n)+"`) must be a CSS ";i+="selector string, or a <canvas>, <image> or <video> object",s.default("warn","Texture '"+this.name+"': "+i,r),e.trigger("warning",{message:"Failed to load texture because "+i,texture:r})}return this.loaded=!0,this.loading=Promise.resolve(this),this.loading}},{key:"update",value:function(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};this.valid&&(this.bind(),this.gl.pixelStorei(this.gl.UNPACK_FLIP_Y_WEBGL,r.UNPACK_FLIP_Y_WEBGL===!1?!1:!0),this.gl.pixelStorei(this.gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL,r.UNPACK_PREMULTIPLY_ALPHA_WEBGL||!1),t instanceof HTMLCanvasElement||t instanceof HTMLVideoElement||t instanceof HTMLImageElement&&t.complete?(this.width=t.width,this.height=t.height,this.gl.texImage2D(this.gl.TEXTURE_2D,0,this.gl.RGBA,this.gl.RGBA,this.gl.UNSIGNED_BYTE,t)):this.gl.texImage2D(this.gl.TEXTURE_2D,0,this.gl.RGBA,this.width,this.height,0,this.gl.RGBA,this.gl.UNSIGNED_BYTE,t),e.trigger("update",this))
+}},{key:"setFiltering",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};if(this.valid){t.filtering=t.filtering||"linear";var r=this.gl;this.bind(),l.default.isPowerOf2(this.width)&&l.default.isPowerOf2(this.height)?(this.power_of_2=!0,r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_S,t.TEXTURE_WRAP_S||t.repeat&&r.REPEAT||r.CLAMP_TO_EDGE),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_T,t.TEXTURE_WRAP_T||t.repeat&&r.REPEAT||r.CLAMP_TO_EDGE),"mipmap"===t.filtering?(this.filtering="mipmap",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.LINEAR_MIPMAP_LINEAR),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.LINEAR),r.generateMipmap(r.TEXTURE_2D)):"linear"===t.filtering?(this.filtering="linear",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.LINEAR),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.LINEAR)):"nearest"===t.filtering&&(this.filtering="nearest",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.NEAREST),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.NEAREST))):(this.power_of_2=!1,r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_S,r.CLAMP_TO_EDGE),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_WRAP_T,r.CLAMP_TO_EDGE),"nearest"===t.filtering?(this.filtering="nearest",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.NEAREST),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.NEAREST)):(this.filtering="linear",r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MIN_FILTER,r.LINEAR),r.texParameteri(r.TEXTURE_2D,r.TEXTURE_MAG_FILTER,r.LINEAR))),e.trigger("update",this)}}},{key:"calculateSprites",value:function(){if(this.sprites)for(var t in this.sprites){var r=this.sprites[t];this.texcoords[t]=e.getTexcoordsForSprite([r[0],r[1]],[r[2],r[3]],[this.width,this.height]),this.sizes[t]=[r[2],r[3]]}}}]),e}();r.default=p,p.create=function(e,t,r){return new p(e,t,r)},p.retain=function(e){p.textures[e]&&p.textures[e].retain()},p.release=function(e){p.textures[e]&&p.textures[e].release()},p.destroy=function(e){var t=Object.keys(p.textures);t.forEach(function(t){var r=p.textures[t];r.gl===e&&r.destroy({force:!0})})},p.getSpriteInfo=function(e,t){var r=p.textures[e];return r&&{size:r.sizes[t],texcoords:r.texcoords[t]}},p.getTexcoordsForSprite=function(e,t,r){var n=r[1]-e[1]-t[1];return[e[0]/r[0],n/r[1],(t[0]+e[0])/r[0],(t[1]+n)/r[1]]},p.createFromObject=function(e,t){var r=[];if(t)for(var n in t){var i=t[n];if(p.changed(n,i)){var o=p.create(e,n,i);r.push(o.loading)}}return Promise.all(r)},p.default="__default",p.createDefault=function(e){return p.create(e,p.default)},p.changed=function(e,t){var r=p.textures[e];if(r){if("element"===r.config_type||null!=t.element)return!0;if(p.texture_configs[e]===JSON.stringify(Object.assign({name:e},t)))return!1}return!0},p.getInfo=function(e){if(e||(e=Object.keys(p.textures)),Array.isArray(e))return Promise.all(e.map(function(e){return p.getInfo(e)}));var t=p.textures[e];if(t){var r=t.loading||Promise.resolve(t);return r.then(function(){return{name:t.name,width:t.width,height:t.height,sprites:t.sprites,texcoords:t.texcoords,sizes:t.sizes,filtering:t.filtering,power_of_2:t.power_of_2,valid:t.valid}})}return Promise.resolve(null)},p.syncTexturesToWorker=function(e){return d.default.postMessage("Texture.getInfo",e).then(function(e){return e.forEach(function(e){p.textures[e.name]=e}),p.textures})},p.getMaxTextureSize=function(e){return e.getParameter(e.MAX_TEXTURE_SIZE)},p.textures={},p.texture_configs={},p.boundTexture=null,p.activeUnit=null,d.default.addTarget("Texture",p),f.default(p)},{"../utils/log":259,"../utils/subscribe":264,"../utils/utils":267,"../utils/worker_broker":269}],209:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i=e("./extensions"),o=n(i),a=e("../utils/log"),s=n(a);r.default={disabled:!1,bound_vao:[],init:function(e){var t=void 0;this.disabled!==!0&&(t=o.default(e,"OES_vertex_array_object")),null!=t?s.default("info","Vertex Array Object extension available"):this.disabled!==!0?s.default("warn","Vertex Array Object extension NOT available"):s.default("warn","Vertex Array Object extension force disabled")},create:function(e,t,r){var n={};n.setup=t,n.teardown=r;var i=o.default(e,"OES_vertex_array_object");return null!=i&&(n._vao=i.createVertexArrayOES(),i.bindVertexArrayOES(n._vao)),n.setup(!0),n},getCurrentBinding:function(e){var t=this.bound_vao.filter(function(t){return t[0]===e})[0];return t&&t[1]},setCurrentBinding:function(e,t){var r=this.bound_vao,n=r.filter(function(t){return t[0]===e})[0];null==n?r.push([e,t]):n[1]=t},bind:function(e,t){var r=o.default(e,"OES_vertex_array_object");if(null!=t)null!=r&&null!=t._vao?(r.bindVertexArrayOES(t._vao),this.setCurrentBinding(e,t)):t.setup(!1);else{var n=this.getCurrentBinding(e);null!=r?r.bindVertexArrayOES(null):null!=n&&"function"==typeof n.teardown&&n.teardown(),this.setCurrentBinding(e,null)}},destroy:function(e,t){var r=o.default(e,"OES_vertex_array_object");null!=r&&null!=t&&null!=t._vao&&(r.deleteVertexArrayOES(t._vao),t._vao=null)}}},{"../utils/log":259,"./extensions":204}],210:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./shader_program"),s=n(a),u=e("./vao"),l=n(u),c=function(){function e(t,r,n,o,a){i(this,e),a=a||{},this.gl=t,this.vertex_data=r,this.element_data=n,this.vertex_layout=o,this.vertex_buffer=this.gl.createBuffer(),this.buffer_size=this.vertex_data.byteLength,this.draw_mode=a.draw_mode||this.gl.TRIANGLES,this.data_usage=a.data_usage||this.gl.STATIC_DRAW,this.vertices_per_geometry=3,this.uniforms=a.uniforms,this.retain=a.retain||!1,this.created_at=+new Date,this.fade_in_time=a.fade_in_time||0,this.vertex_count=this.vertex_data.byteLength/this.vertex_layout.stride,this.element_count=0,this.vaos={},this.toggle_element_array=!1,this.element_data?(this.toggle_element_array=!0,this.element_count=this.element_data.length,this.geometry_count=this.element_count/this.vertices_per_geometry,this.element_type=this.element_data.constructor===Uint16Array?this.gl.UNSIGNED_SHORT:this.gl.UNSIGNED_INT,this.element_buffer=this.gl.createBuffer(),this.buffer_size+=this.element_data.byteLength,this.gl.bindBuffer(this.gl.ELEMENT_ARRAY_BUFFER,this.element_buffer),this.gl.bufferData(this.gl.ELEMENT_ARRAY_BUFFER,this.element_data,this.data_usage)):this.geometry_count=this.vertex_count/this.vertices_per_geometry,this.gl.bindBuffer(this.gl.ARRAY_BUFFER,this.vertex_buffer),this.gl.bufferData(this.gl.ARRAY_BUFFER,this.vertex_data,this.data_usage),this.retain||(delete this.vertex_data,delete this.element_data),this.valid=!0}return o(e,[{key:"render",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};if(!this.valid)return!1;var t=e.program||s.default.current;t.use(),this.uniforms&&(t.saveUniforms(this.uniforms),t.setUniforms(this.uniforms,!1));var r=(+new Date-this.created_at)/1e3;return t.uniform("1f","u_visible_time",r),this.bind(t),this.toggle_element_array?this.gl.drawElements(this.draw_mode,this.element_count,this.element_type,0):this.gl.drawArrays(this.draw_mode,0,this.vertex_count),l.default.bind(this.gl,null),this.uniforms&&t.restoreUniforms(this.uniforms),r<this.fade_in_time}},{key:"bind",value:function(e){var t=this,r=this.vaos[e.id];r?l.default.bind(this.gl,r):this.vaos[e.id]=l.default.create(this.gl,function(r){t.gl.bindBuffer(t.gl.ARRAY_BUFFER,t.vertex_buffer),t.toggle_element_array&&t.gl.bindBuffer(t.gl.ELEMENT_ARRAY_BUFFER,t.element_buffer),t.vertex_layout.enable(t.gl,e,r)})}},{key:"destroy",value:function(){if(!this.valid)return!1;this.valid=!1;for(var e in this.vaos)l.default.destroy(this.gl,this.vaos[e]);return this.gl.deleteBuffer(this.vertex_buffer),this.vertex_buffer=null,this.element_buffer&&(this.gl.deleteBuffer(this.element_buffer),this.element_buffer=null),delete this.vertex_data,delete this.element_data,!0}}]),e}();r.default=c},{"./shader_program":207,"./vao":209}],211:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function o(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function a(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}Object.defineProperty(r,"__esModule",{value:!0});var s,u=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),l=e("./constants"),c=n(l),f=e("../utils/log"),h=n(f),d=e("./vertex_elements"),p=n(d),_=(s={},a(s,c.default.FLOAT,Float32Array),a(s,c.default.BYTE,Int8Array),a(s,c.default.UNSIGNED_BYTE,Uint8Array),a(s,c.default.INT,Int32Array),a(s,c.default.UNSIGNED_INT,Uint32Array),a(s,c.default.SHORT,Int16Array),a(s,c.default.UNSIGNED_SHORT,Uint16Array),s),m=function(){function e(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=r.prealloc,a=void 0===n?500:n;o(this,e),this.vertex_layout=t,this.vertex_elements=new p.default,e.array_pool.length>0?(this.vertex_buffer=e.array_pool.pop(),this.byte_length=this.vertex_buffer.byteLength,this.size=Math.floor(this.byte_length/this.vertex_layout.stride),h.default("trace","VertexData: reused buffer of bytes "+this.byte_length+", "+this.size+" vertices")):(this.size=a,this.byte_length=this.vertex_layout.stride*this.size,this.vertex_buffer=new 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Uint8Array(this.byte_length);t.set(this.vertex_buffer),e.array_pool.push(this.vertex_buffer),this.vertex_buffer=t,this.setBufferViews(),this.realloc_count++}}},{key:"addVertex",value:function(e){this.checkBufferSize();for(var t=0,r=this.components.length,n=0;r>n;n++){var i=this.components[n];i[1][(this.offset>>i[2])+i[3]]=e[t++]}this.offset+=this.vertex_layout.stride,this.vertex_count++}},{key:"end",value:function(){return this.vertex_buffer=this.vertex_buffer.subarray(0,this.offset),this.element_buffer=this.vertex_elements.end(),h.default("trace","VertexData: "+this.size+" vertices total, realloc count "+this.realloc_count),this}}]),e}();r.default=m,m.array_pool=[]},{"../utils/log":259,"./constants":202,"./vertex_elements":212}],212:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){var r=t&&c?Uint32Array:Uint16Array;return new r(e)}Object.defineProperty(r,"__esModule",{value:!0});var a=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),s=e("../utils/worker_broker"),u=n(s),l=Math.pow(2,16)-1,c=!1,f=function(){function e(){i(this,e),this.array=[],this.has_overflown=!1}return a(e,[{key:"push",value:function(e){(!this.has_overflown||c)&&(e>l&&(this.has_overflown=!0,!c)||this.array.push(e))}},{key:"end",value:function(){if(this.array.length){var e=o(this.array,this.has_overflown);return this.array=[],this.has_overflown=!1,e}return!1}}]),e}();r.default=f,f.setUint32Flag=function(e){c=e},u.default.addTarget("VertexElements",f)},{"../utils/worker_broker":269}],213:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a 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this.components.push([o.type,null,a,u]);this.index[o.name]=r,r+=o.size}}return o(e,[{key:"enable",value:function(t,r,n){for(var i,o,a=0;a<this.attribs.length;a++)i=this.attribs[a],o=r.attribute(i.name).location,-1!==o&&((!e.enabled_attribs[o]||n)&&t.enableVertexAttribArray(o),t.vertexAttribPointer(o,i.size,i.type,i.normalized,this.stride,i.offset),e.enabled_attribs[o]=r);for(o in e.enabled_attribs)this.disableUnusedAttribute(t,o,r)}},{key:"disableUnusedAttribute",value:function(t,r,n){e.enabled_attribs[r]!==n&&(t.disableVertexAttribArray(r),delete e.enabled_attribs[r])}},{key:"createVertexData",value:function(){return new l.default(this)}}]),e}();r.default=c,c.enabled_attribs={}},{"./constants":202,"./vertex_data":211}],214:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i,o=e("./repeat_group"),a=n(o),s=e("../utils/log"),u=n(s);r.default=i={tiles:{},startTile:function(e){var t=this.tiles[e]={bboxes:{aabb:[],obb:[]},objects:{},keep:{},styles:{}};t.complete=new Promise(function(e,r){t.resolve=e,t.reject=r})},resetTile:function(e){delete this.tiles[e]},addStyle:function(e,t){this.tiles[t].styles[e]=!0},collide:function(e,t,r){var n=this.tiles[r];if(!n)return u.default("trace","Collision.collide() called with null tile",r,this.tiles,t,e),Promise.resolve([]);for(var i=n.objects,o=0;o<e.length;o++){var a=e[o],s=a.label.layout.priority;i[s]=i[s]||{},i[s][t]=i[s][t]||[],i[s][t].push(a)}return delete n.styles[t],0===Object.keys(n.styles).length&&this.endTile(r),n.complete.then(function(){return n.keep[t]||[]})},endTile:function(e){var t=this.tiles[e],r=t.keep;a.default.clear(e);for(var n=Object.keys(t.objects).sort(function(e,t){return e-t}),i=0;i<n.length;i++){var o=t.objects[n[i]];if(o)for(var s in o){var u=o[s];r[s]=r[s]||[];for(var l=0;l<u.length;l++){var c=u[l];this.canBePlaced(c,e,c.linked)&&(c.linked?this.canBePlaced(c.linked,e,c)&&(r[s].push(c),this.place(c,e),this.place(c.linked,e)):(r[s].push(c),this.place(c,e)))}}}delete this.tiles[e],t.resolve()},canBePlaced:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null,n=e.label,i=e.label.layout;if(null!=n.placed)return n.placed;var o=this.tiles[t].bboxes;if(i.collide&&n.discard(o,r&&r.label))i.collide&&(n.placed=!1);else{var s=a.default.check(n,i,t);if(!s)return!0;n.placed=!1}return n.placed},place:function(e,t){var r=e.label;null==r.placed&&(a.default.add(r,r.layout,t),r.add(this.tiles[t].bboxes))}}},{"../utils/log":259,"./repeat_group":221}],215:[function(e,t,r){"use strict";function n(e,t){return e[2]<t[0]||e[0]>t[2]||e[3]<t[1]||e[1]>t[3]?!1:!0}function i(e,t,r){for(var i=0;i<t.length&&(!n(e,t[i])||null==r(i));i++);}Object.defineProperty(r,"__esModule",{value:!0}),r.boxIntersectsBox=n,r.boxIntersectsList=i},{}],216:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./point_anchor"),s=n(a),u=e("./intersect"),l=e("../utils/utils"),c=n(l),f=e("../utils/obb"),h=n(f),d=function(){function e(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};i(this,e),this.size=t,this.layout=r,this.position=null,this.anchor=Array.isArray(this.layout.anchor)?this.layout.anchor[0]:this.layout.anchor,this.placed=null,this.offset=r.offset,this.aabb=null,this.obb=null,this.align="center",this.throw_away=!1}return o(e,[{key:"update",value:function(){this.align=this.layout.align||s.default.alignForAnchor(this.anchor)}},{key:"occluded",value:function(e){var t=this,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null,n=!1,i=e.aabb,o=e.obb;return i.length>0&&u.boxIntersectsList(this.aabb,i,function(e){return r&&i[e]===r.aabb?void 0:0===t.obb.angle&&0===o[e].angle?(n=!0,!0):h.default.intersect(t.obb,o[e])?(n=!0,!0):void 0}),n}},{key:"add",value:function(e){this.placed=!0,e.aabb.push(this.aabb),e.obb.push(this.obb)}},{key:"inTileBounds",value:function(){var e=[this.aabb[0],this.aabb[1]],t=[this.aabb[2],this.aabb[3]];return c.default.pointInTile(e)&&c.default.pointInTile(t)?!0:!1}},{key:"discard",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null;return this.throw_away?!0:this.occluded(e,t)}}]),e}();r.default=d,d.epsilon=.9999},{"../utils/obb":262,"../utils/utils":267,"./intersect":215,"./point_anchor":219}],217:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function o(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function a(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function s(e,t){return t/e}function u(e,t){var r=g.default.sub(t,e);return g.default.angle(r)}function l(e,t){return-u(e,t)}function c(e){for(var t=[],r=0;r<e.length-1;r++){var n=e[r],i=e[r+1],o=Math.hypot(n[0]-i[0],n[1]-i[1]);t.push(o)}return t}function f(e,t){var r=void 0,n=void 0;for(e>t?(r=t,n=e):(r=e,n=t);n-r>Math.PI;)r+=2*Math.PI;return 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i=[{type:"straight",tolerance:n.no_curving?w:x},{type:"curved"},{type:"straight",tolerance:k}],o=0;o<i.length;o++){var a=i[o],s=void 0;if("straight"===a.type?s=new P(t,r,n,a.tolerance):"curved"===a.type&&!n.no_curving&&r.length>2&&(s=new z(e,r,n)),s&&!s.throw_away)return s}return!1}};r.default=M;var O=function(){function e(t){a(this,e),this.layout=t,this.position=[],this.angle=0,this.offset=t.offset.slice(),this.obbs=[],this.aabbs=[],this.type=""}return d(e,[{key:"add",value:function(e){this.placed=!0;for(var t=0;t<this.aabbs.length;t++){var r=this.aabbs[t],n=this.obbs[t],i={aabb:r,obb:n};_.default.prototype.add.call(i,e)}}},{key:"discard",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null;if(this.throw_away)return!0;for(var r=0;r<this.obbs.length;r++){var n=this.aabbs[r],i=this.obbs[r],o={aabb:n,obb:i},a=_.default.prototype.occluded.call(o,e,t);if(a)return!0}return!1}},{key:"inTileBounds",value:function(){for(var e=0;e<this.aabbs.length;e++){var t=this.aabbs[e],r={aabb:t},n=_.default.prototype.inTileBounds.call(r);if(!n)return!1}return!0}}],[{key:"splitLineByOrientation",value:function(e){for(var t=[e[0]],r=0,n=0,i=0,o=t,a=!1,s=1;s<e.length;s++){var u=e[s],l=e[s-1],c=g.default.length(g.default.sub(u,l));u[0]>l[0]?1===i?(t.push(u),r+=c,r>n&&(o=t,n=r,a=!1)):(t=[l,u],r=c,r>n&&(o=t,n=r,a=!1),i=1):u[0]<l[0]?-1===i?(t.unshift(u),r+=c,r>n&&(o=t,n=r,a=!0)):(t=[u,l],r=c,r>n&&(o=t,n=r,a=!0),i=-1):(-1===i?t.unshift(u):(t.push(u),i=1),r+=c,r>n&&(o=t,n=r,a=-1===i))}return[o,a]}},{key:"createOBB",value:function(e,t,r,n,i,o,a){var s=e[0],u=e[1];return!o||0===o[0]&&0===o[1]||(o=g.default.rot(o,i),s+=o[0]*a,u-=o[1]*a),new y.default(s,u,-n,t,r)}}]),e}(),P=function(e){function t(e,r,n,o){a(this,t);var s=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,n));return s.type="straight",s.throw_away=!s.fit(e,r,n,o),s}return o(t,e),d(t,[{key:"fit",value:function(e,t,r,n){var i=r.units_per_pixel,o=void 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T=b[A],E=t.scaleLine(T,r),S=h(E,2),M=S[0],P=S[1];w=M[x];var z=t.placeAtIndex(x,M,P,f),L=z.positions,N=z.offsets,j=z.angles,I=z.pre_angles,C=N.map(function(e){return Math.sqrt(e[0]*e[0]+e[1]*e[1])/i});if(this.angle=1/j.length*j.reduce(function(e,t){return e+t}),0===T)for(var F=0;F<L.length;F++){var U=L[F],D=I[F],B=f[F],G=D+j[F],V=this.angle;o&&(V+=Math.PI),-1===n.orientation&&(V+=Math.PI);var q=t.createOBB(U,B,_,u,V,G,i),W=q.getExtent();this.obbs.push(q),this.aabbs.push(W)}this.offsets[k].push(C[k]),this.angles[k].push(j[k]),this.pre_angles[k].push(I[k])}}return!0}}],[{key:"checkTileBoundary",value:function(e,t,r,n,i){var o=0,a=e.length-1;r*=_.default.epsilon;for(var s=t[o]*_.default.epsilon,l=t[t.length-1]*_.default.epsilon;a>o;){var c=u(e[o],e[o+1]),f=g.default.add(g.default.rot([s/2,0],c),e[o]),h=O.createOBB(f,s,r,-c,-c,n,i),d=h.getExtent(),p=_.default.prototype.inTileBounds.call({aabb:d});if(p)break;o++}for(;a>o;){var m=u(e[a-1],e[a]),v=g.default.add(g.default.rot([-l/2,0],m),e[a]),y=O.createOBB(v,l,r,-m,-m,n,i),b=y.getExtent(),x=_.default.prototype.inTileBounds.call({aabb:b});if(x)break;a--}return[o,a]}},{key:"curvaturePlacement",value:function(e,t,r,n,i,o){i=i||0,o=o||e.length-1;for(var a=[],s=i+1;o>s;s++){var u=e[s-1],l=e[s],c=e[s+1],f=g.default.perp(l,u),h=g.default.perp(c,l),d=g.default.angleBetween(f,h);d>S&&(d=1/0),a.push(d)}a.push(1/0);for(var p=[],_=[],m=i,v=0,y=0;i>y;y++)v+=r[y];for(;t>v+n;){for(var b=v,x=b+n,w=b,k=m,A=0;o>k&&w+r[k]<x&&(A+=a[k],1/0!==A);)w+=r[k],k++;if(0===A)return m;var R=A/(k-m);p.push(A),_.push(R),v+=r[m],m++}if(0===p.length)return-1;var M=Math.min.apply(null,p),O=p.indexOf(M),P=_[O];return T>M&&E>P?p.indexOf(M):-1}},{key:"scaleLine",value:function(e,t){var r=[t[0]],n=[];return t.forEach(function(i,o){if(o!==t.length-1){var a=g.default.sub(t[o+1],t[o]),s=g.default.mult(a,1+e);r.push(g.default.add(r[o],s)),n.push(g.default.length(s))}}),[r,n]}},{key:"placeAtIndex",value:function(e,r,n,i){var o=r[e],a=t.getIndicesAndOffsets(e,n,i),s=h(a,2),u=s[0],l=s[1],c=t.getPositionsFromIndicesAndOffsets(r,u,l),f=t.getAnglesFromIndicesAndOffsets(o,u,r,c),d=h(f,3),p=d[0],_=d[1],m=d[2];return{positions:c,offsets:p,angles:_,pre_angles:m}}},{key:"getIndicesAndOffsets",value:function(e,t,r){for(var n=r.length,i=[],o=[],a=0,s=0,u=0;n>a;){for(var l=r[a];n>a&&s+.5*l<=u+t[e];){var c=s-u+.5*l;o.push(c),i.push(e),s+=l,a++,l=r[a]}u+=t[e],e++}return[i,o]}},{key:"getPositionsFromIndicesAndOffsets",value:function(e,t,r){for(var n=[],i=0;i<t.length;i++){var o=t[i],a=r[i],s=u(e[o],e[o+1]),l=g.default.rot([a,0],s),c=g.default.add(e[o],l);n.push(c)}return n}},{key:"getAnglesFromIndicesAndOffsets",value:function(e,t,r,n){for(var i=[],o=[],a=[],s=0;s<n.length;s++){var u=n[s],c=t[s],f=g.default.sub(u,e),h=-g.default.angle(f),d=l(r[c],r[c+1]),p=d-h;if(s>0){var _=i[s-1],m=o[s-1];Math.abs(h-_)>Math.PI&&(h+=h>_?-2*Math.PI:2*Math.PI),Math.abs(m-p)>Math.PI&&(p+=p>m?-2*Math.PI:2*Math.PI)}i.push(h),o.push(p),a.push(f)}return[a,i,o]}},{key:"createOBB",value:function(e,t,r,n,i,o,a){var s=e[0],u=e[1];return!n||0===n[0]&&0===n[1]||(n=g.default.rot(n,i),s+=n[0]*a,u-=n[1]*a),new y.default(s,u,-o,t,r)}}]),t}(O)},{"../utils/obb":262,"../vector":270,"./label":216}],218:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function a(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}Object.defineProperty(r,"__esModule",{value:!0});var s=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),u=function y(e,t,r){null===e&&(e=Function.prototype);var n=Object.getOwnPropertyDescriptor(e,t);if(void 0===n){var i=Object.getPrototypeOf(e);return null===i?void 0:y(i,t,r)}if("value"in n)return n.value;var o=n.get;return void 0===o?void 0:o.call(r)},l=e("./label"),c=n(l),f=e("./point_anchor"),h=n(f),d=e("../geo"),p=n(d),_=e("../utils/obb"),m=n(_),g=e("../styles/style_parser"),v=function(e){function t(e,r,n){i(this,t);var a=o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,r,n));return a.position=[e[0],e[1]],a.parent=a.layout.parent,a.update(),a.start_anchor_index=1,a.degenerate=!(a.size[0]||a.size[1]||a.layout.buffer[0]||a.layout.buffer[1]),a.throw_away=!a.getNextFit(),a}return a(t,e),s(t,[{key:"update",value:function(){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"update",this).call(this),this.computeOffset(),this.updateBBoxes()}},{key:"computeOffset",value:function(){if(this.offset=[this.layout.offset[0],this.layout.offset[1]],this.parent){var e=this.parent;this.offset=h.default.computeOffset(this.offset,e.size,e.anchor,h.default.zero_buffer),this.offset=h.default.computeOffset(this.offset,e.size,this.anchor,h.default.zero_buffer),e.offset!==g.StyleParser.zeroPair&&(this.offset===g.StyleParser.zeroPair?this.offset=e.offset:(this.offset[0]+=e.offset[0],this.offset[1]+=e.offset[1]))}this.offset=h.default.computeOffset(this.offset,this.size,this.anchor)}},{key:"updateBBoxes",value:function(){var e=(this.size[0]+2*this.layout.buffer[0])*this.layout.units_per_pixel*c.default.epsilon,t=(this.size[1]+2*this.layout.buffer[1])*this.layout.units_per_pixel*c.default.epsilon;this.layout.italic&&(e+=5*this.layout.units_per_pixel);var r=[this.position[0]+this.offset[0]*this.layout.units_per_pixel,this.position[1]-this.offset[1]*this.layout.units_per_pixel];this.obb=new m.default(r[0],r[1],0,e,t),this.aabb=this.obb.getExtent()}},{key:"moveIntoTile",value:function(){var e=!1;return this.aabb[0]<0&&(this.position[0]+=-this.aabb[0],e=!0),this.aabb[2]>=p.default.tile_scale&&(this.position[0]-=this.aabb[2]-p.default.tile_scale+1,e=!0),this.aabb[3]>0&&(this.position[1]-=this.aabb[3],e=!0),this.aabb[1]<=-p.default.tile_scale&&(this.position[1]-=this.aabb[1]+p.default.tile_scale-1,e=!0),e&&this.updateBBoxes(),e}},{key:"getNextFit",value:function(){if(!this.layout.cull_from_tile||this.inTileBounds())return!0;if(this.layout.move_into_tile)return this.moveIntoTile(),!0;if(Array.isArray(this.layout.anchor))for(var e=1;e<this.layout.anchor.length;e++)if(this.anchor=this.layout.anchor[e],this.update(),this.start_anchor_index=e,this.inTileBounds())return!0;return!1}},{key:"discard",value:function(e){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null;if(this.degenerate)return!1;if(u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"discard",this).call(this,e,r)){if(Array.isArray(this.layout.anchor))for(var n=this.start_anchor_index;n<this.layout.anchor.length;n++)if(this.anchor=this.layout.anchor[n],this.update(),(!this.layout.cull_from_tile||this.inTileBounds())&&!u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"discard",this).call(this,e,r))return!1;return!0}return!1}}]),t}(c.default);r.default=v,v.PLACEMENT={VERTEX:0,MIDPOINT:1,SPACED:2,CENTROID:3}},{"../geo":201,"../styles/style_parser":245,"../utils/obb":262,"./label":216,"./point_anchor":219}],219:[function(e,t,r){"use strict";Object.defineProperty(r,"__esModule",{value:!0});var n=["left","top-left","bottom-left"],i=["right","top-right","bottom-right"],o=["top","top-left","top-right"],a=["bottom","bottom-left","bottom-right"],s=void 0;r.default=s={computeOffset:function(e,t,r){var n=arguments.length>3&&void 0!==arguments[3]?arguments[3]:null;
+if(!r||"center"===r)return e;var i=[e[0],e[1]];return n=n||this.default_buffer,this.isLeftAnchor(r)?(i[0]-=t[0]/2,"left"===r&&(i[0]-=n[0])):this.isRightAnchor(r)&&(i[0]+=t[0]/2,"right"===r&&(i[0]+=n[1])),this.isTopAnchor(r)?(i[1]-=t[1]/2,"top"===r&&(i[1]-=n[2])):this.isBottomAnchor(r)&&(i[1]+=t[1]/2,"bottom"===r&&(i[1]+=n[3])),i},alignForAnchor:function(e){if(e&&"center"!==e){if(this.isLeftAnchor(e))return"right";if(this.isRightAnchor(e))return"left"}return"center"},isLeftAnchor:function(e){return n.indexOf(e)>-1},isRightAnchor:function(e){return i.indexOf(e)>-1},isTopAnchor:function(e){return o.indexOf(e)>-1},isBottomAnchor:function(e){return a.indexOf(e)>-1},default_buffer:[2.5,2.5,1.5,.75],zero_buffer:[0,0,0,0]}},{}],220:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t,r){var n=[],i=r.placement,s=Math.max(t[0],t[1])*r.placement_min_length_ratio*r.units_per_pixel;switch(i){case p.SPACED:var l=o(e,s,r);if(!l)return[];for(var c=l.positions,f=l.angles,_=0;_<c.length;_++){var m=c[_],g=f[_];if(r.tile_edges===!0||!d.isCoordOutsideTile(m)){var v=new h.default(m,t,r);v.angle=g,n.push(v)}}break;case p.VERTEX:for(var y=void 0,b=void 0,x=void 0,w=0;w<e.length-1;w++)y=e[w],b=e[w+1],r.tile_edges!==!0&&d.isCoordOutsideTile(y)||(x=new h.default(y,t,r),x.angle=a(y,b,r.angle),n.push(x));x=new h.default(b,t,r),x.angle=a(y,b,r.angle),n.push(x);break;case p.MIDPOINT:for(var k=0;k<e.length-1;k++){var A=e[k],T=e[k+1],E=[.5*(A[0]+T[0]),.5*(A[1]+T[1])];if((r.tile_edges===!0||!d.isCoordOutsideTile(E))&&(!s||u(A,T)>s)){var S=new h.default(E,t,r);S.angle=a(A,T,r.angle),n.push(S)}}}return n}function o(e,t,r){var n=r.units_per_pixel,i=(r.placement_spacing||_)*n,o=s(e);if(t>=o)return!1;for(var a=Math.max(Math.floor(o/i),1),u=o-(a-1)*i,c=[],f=[],h=.5*u,d=0;a>d;d++){var p=l(e,h,t,r),m=p.position,g=p.angle;null!=m&&null!=g&&(c.push(m),f.push(g)),h+=i}return{positions:c,angles:f}}function a(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:0;return"auto"===r?Math.atan2(t[0]-e[0],t[1]-e[1]):r}function s(e){for(var t=0,r=0;r<e.length-1;r++)t+=u(e[r],e[r+1]);return t}function u(e,t){return Math.sqrt(Math.pow(e[0]-t[0],2)+Math.pow(e[1]-t[1],2))}function l(e,t,r,n){for(var i=0,o=void 0,s=void 0,l=0;l<e.length-1;l++){var f=e[l],h=e[l+1],d=u(f,h);if(!(r>=d)&&(i+=d,i>t)){o=c(f,h,i-t),s=a(f,h,n.angle);break}}return{position:o,angle:s}}function c(e,t,r){var n=u(e,t),i=r/n;return[i*e[0]+(1-i)*t[0],i*e[1]+(1-i)*t[1]]}Object.defineProperty(r,"__esModule",{value:!0}),r.default=i;var f=e("./label_point"),h=n(f),d=e("../builders/common"),p=h.default.PLACEMENT,_=80},{"../builders/common":196,"./label_point":218}],221:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("../geo"),s=n(a),u=function(){function e(t,r,n){i(this,e),this.key=t,this.repeat_dist=r,this.repeat_dist_sq=this.repeat_dist*this.repeat_dist,this.max_repeat_dist_sq=n*n,this.one_per_group=this.repeat_dist_sq>=this.max_repeat_dist_sq?!0:!1,this.positions=[]}return o(e,[{key:"check",value:function(e){if(this.one_per_group){if(this.positions.length>0)return{dist_sq:this.max_repeat_dist_sq,repeat_dist_sq:this.repeat_dist_sq,one_per_group:this.one_per_group}}else for(var t=e.position,r=0;r<this.positions.length;r++){var n=this.positions[r],i=t[0]-n[0],o=t[1]-n[1],a=i*i+o*o;if(a<this.repeat_dist_sq)return{dist_sq:a,repeat_dist_sq:this.repeat_dist_sq}}}},{key:"add",value:function(e){e&&e.position&&this.positions.push(e.position)}}],[{key:"clear",value:function(e){this.groups[e]={}}},{key:"check",value:function(e,t,r){return t.repeat_distance&&t.repeat_group&&this.groups[r][t.repeat_group]?this.groups[r][t.repeat_group].check(e):void 0}},{key:"add",value:function(t,r,n){r.repeat_distance&&r.repeat_group&&(null==this.groups[n][r.repeat_group]&&(this.groups[n][r.repeat_group]=new e(r.repeat_group,r.repeat_distance,e.max_repeat_dist)),this.groups[n][r.repeat_group].add(t))}}]),e}();r.default=u,u.groups={},u.max_repeat_dist=s.default.tile_scale},{"../geo":201}],222:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){return o(e)}function o(e){if("undefined"!=typeof p)return new p(e);if(s.default.is_main){var t=e.leaflet||window.L,n=t.GridLayer?t.GridLayer:t.TileLayer,i=n===t.GridLayer?"1.x":"0.7.x",o={},a=void 0,u=void 0;return n===t.TileLayer&&(o._addTile=function(){},o._removeTile=function(){},o._reset=function(){n.prototype._reset.apply(this,arguments),this.scene&&this.scene.container&&this.scene.canvas&&this.scene.container.appendChild(this.scene.canvas)}),Object.assign(o,{initialize:function(e){e.showDebug=e.showDebug?!0:!1,t.setOptions(this,e),this.createScene(),this.hooks={},this._updating_tangram=!1,this._zoomAnimated=!1},createScene:function(){this.scene=l.default.create(this.options.scene,{numWorkers:this.options.numWorkers,preUpdate:this.options.preUpdate,postUpdate:this.options.postUpdate,continuousZoom:"1.x"===p.leafletVersion,wrapView:this.options.noWrap===!0?!1:!0,highDensityDisplay:this.options.highDensityDisplay,logLevel:this.options.logLevel,introspection:this.options.introspection,webGLContextOptions:this.options.webGLContextOptions,disableRenderLoop:this.options.disableRenderLoop})},onAdd:function(e){var t=this;this.scene||this.createScene(),n.prototype.onAdd.apply(this,arguments),this.hooks.resize=function(){t._updating_tangram=!0,t.updateSize(),t._updating_tangram=!1},e.on("resize",this.hooks.resize),this.hooks.move=function(){if(!t._updating_tangram){t._updating_tangram=!0,t.scene.view.setPanning(!0);var r=e.getCenter();r.zoom=Math.max(Math.min(e.getZoom(),e.getMaxZoom()||f.default.default_view_max_zoom),e.getMinZoom()),t.scene.view.setView(r),t._mapLayerCount>1&&t.scene.immediateRedraw(),t.reverseTransform(),t._updating_tangram=!1}},e.on("move",this.hooks.move),this.hooks.zoomstart=function(){t._updating_tangram||(t._updating_tangram=!0,t.scene.view.startZoom(),t._updating_tangram=!1)},e.on("zoomstart",this.hooks.zoomstart),this.hooks.moveend=function(){t.scene.view.setPanning(!1),t.scene.requestRedraw()},e.on("moveend",this.hooks.moveend),this.modifyScrollWheelBehavior(e),this.modifyDoubleClickZoom(e),u=d.default(function(e){e._moveEnd(!0),e.fire("viewreset")},2*e.options.wheelDebounceTime),this.trackMapLayerCounts(e),this.setupSelectionEventHandlers(e),this.setSelectionEvents(this.options.events),this.scene.container=this.getContainer(),this.updateSize(),this.updateView(),this.resizeOnFirstVisible(),this.scene.subscribe({move:this.onTangramViewUpdate.bind(this)}),this.scene.load(this.options.scene,{config_path:this.options.sceneBasePath,blocking:!1}).then(function(){t._updating_tangram=!0,t.updateSize(),t.updateView(),t.reverseTransform(),t._updating_tangram=!1,t.fire("init")}).catch(function(e){t.fire("error",e)})},onRemove:function(e){n.prototype.onRemove.apply(this,arguments),e.off("layeradd layerremove overlayadd overlayremove",this._updateMapLayerCount),e.off("resize",this.hooks.resize),e.off("move",this.hooks.move),e.off("zoomstart",this.hooks.zoomstart),e.off("moveend",this.hooks.moveend),e.off("click",this.hooks.click),e.off("mousemove",this.hooks.mousemove),e.off("mouseout",this.hooks.mouseout),document.removeEventListener("visibilitychange",this.hooks.visibilitychange),this.hooks={},this.scene&&(this.scene.destroy(),this.scene=null)},createTile:function(e){var t=e.x+"/"+e.y+"/"+e.z,r=document.createElement("div");if(r.setAttribute("data-tile-key",t),r.style.width="256px",r.style.height="256px",this.options.showDebug){var n=document.createElement("div");n.textContent=t,n.style.position="absolute",n.style.left=0,n.style.top=0,n.style.color="white",n.style.fontSize="16px",n.style.textOutline="1px #000000",n.style.padding="8px",r.appendChild(n),r.style.borderStyle="solid",r.style.borderColor="white",r.style.borderWidth="1px"}return r},modifyScrollWheelBehavior:function(e){if(this.scene.view.continuous_zoom&&e.scrollWheelZoom&&this.options.modifyScrollWheel!==!1){e.options.zoomSnap=0;var r=e.scrollWheelZoom.enabled();e.scrollWheelZoom.disable(),t.Browser.chrome||t.Browser.safari?e.scrollWheelZoom._onWheelScroll=function(e){var r=t.DomEvent.getWheelDelta(e);this._delta+=r,this._lastMousePos=this._map.mouseEventToContainerPoint(e),this._performZoom(),t.DomEvent.stop(e)}:e.options.wheelDebounceTime=20,e.scrollWheelZoom._performZoom=function(){var e=this._map,t=e.getZoom();e._stop();var r=this._delta/(4*this._map.options.wheelPxPerZoomLevel);this._delta=0,t+r>=this._map.getMaxZoom()?r=this._map.getMaxZoom()-t:t+r<=this._map.getMinZoom()&&(r=this._map.getMinZoom()-t),r&&("center"===e.options.scrollWheelZoom?a(e,e.getCenter(),t+r):a(e,this._lastMousePos,t+r),u(e))},r&&e.scrollWheelZoom.enable()}},modifyDoubleClickZoom:function(e){if(this.scene.view.continuous_zoom&&e.doubleClickZoom&&this.options.modifyDoubleClickZoom!==!1){var r=function(e,r,n,i){function o(){var i=(Date.now()-c)/h;if(1>=i){e._flyToFrame=t.Util.requestAnimFrame(o,e);var d=u.add(l.subtract(u).multiplyBy(i));d=[d.x,d.y],d=f.default.metersToLatLng(d),a(e,r,s+(n-s)*i)}else a(e,r,n)._moveEnd(!0)}if(i=i||{},i.animate===!1||!t.Browser.any3d)return e.setView(r,n,i);e._stop();var s=e._zoom;r=t.latLng(r),n=void 0===n?s:n,n=Math.min(n,e.getMaxZoom());var u=e.project(e.getCenter(),s),l=e.project(r,s),c=Date.now(),h=i.duration?1e3*i.duration:75;return e._moveStart(!0),o.call(e),e},n=e.doubleClickZoom.enabled();e.doubleClickZoom.disable(),e.doubleClickZoom._onDoubleClick=function(e){var t=this._map,n=t.getZoom(),i=t.options.zoomDelta,o=e.originalEvent.shiftKey?n-i:n+i;"center"===t.options.doubleClickZoom?r(t,t.getCenter(),o):r(t,t.containerPointToLatLng(e.containerPoint),o)},n&&e.doubleClickZoom.enable()}},updateView:function(){var e=this._map.getCenter();e.zoom=Math.max(Math.min(this._map.getZoom(),this._map.getMaxZoom()||f.default.default_view_max_zoom),this._map.getMinZoom()),this.scene.view.setView(e)},updateSize:function(){var e=this._map.getSize();this.scene.resizeMap(e.x,e.y)},resizeOnFirstVisible:function(){var e=this,t=!0;this.hooks.visibilitychange=function(){t&&(t=!1,e.updateSize())},document.addEventListener("visibilitychange",this.hooks.visibilitychange)},onTangramViewUpdate:function(){if(this._map&&!this._updating_tangram){var e=this._map.getCenter(),t=this.scene.view.center;(e.lng!==t.lng||e.lat!==t.lat||this._map.getZoom()!==this.scene.view.zoom)&&(this._updating_tangram=!0,this._map.setView([this.scene.view.center.lat,this.scene.view.center.lng],this.scene.view.zoom,{animate:!1}),this.reverseTransform(),this._updating_tangram=!1)}},render:function(){this.scene&&this.scene.update()},reverseTransform:function(){if(this._map&&this.scene&&this.scene.container){var e=this._map.containerPointToLayerPoint([0,0]);t.DomUtil.setPosition(this.scene.container,e)}},setupSelectionEventHandlers:function(e){var t=this;this._selection_events={},this.hooks.click=function(e){"function"==typeof t._selection_events.click&&t.scene.getFeatureAt(e.containerPoint).then(function(r){var n=Object.assign({},r,{leaflet_event:e});t._selection_events.click(n)})},e.on("click",this.hooks.click),this.hooks.mousemove=function(e){"function"==typeof t._selection_events.hover&&t.scene.getFeatureAt(e.containerPoint).then(function(r){var n=Object.assign({},r,{leaflet_event:e});t._selection_events.hover(n)})},e.on("mousemove",this.hooks.mousemove),this.hooks.mouseout=function(e){"function"==typeof t._selection_events.hover&&t._selection_events.hover({changed:!0,leaflet_event:e})},e.on("mouseout",this.hooks.mouseout)},setSelectionEvents:function(e){this._selection_events=Object.assign(this._selection_events,e)},trackMapLayerCounts:function(e){var t=this;this._updateMapLayerCount=function(){var r=e.getPanes().mapPane.childNodes;t._mapLayerCount=0;for(var n=0;n<r.length;n++)t._mapLayerCount+=r[n].childNodes.length},e.on("layeradd layerremove overlayadd overlayremove",this._updateMapLayerCount),this._updateMapLayerCount()}}),a=function(e,r,n){var i=e.getZoomScale(n),o=e.getSize().divideBy(2),a=r instanceof t.Point?r:e.latLngToContainerPoint(r),s=a.subtract(o).multiplyBy(1-1/i),u=e.containerPointToLatLng(o.add(s));return e._move(u,n,{flyTo:!0})},r.LeafletLayer=p=n.extend(o),"function"!=typeof p.remove&&(p.prototype.remove=function(){this._map&&this._map.removeLayer(this),this.fire("remove")}),p.layerBaseClass=n,p.leafletVersion=i,new p(e)}}Object.defineProperty(r,"__esModule",{value:!0}),r.LeafletLayer=void 0,r.leafletLayer=i;var a=e("./utils/thread"),s=n(a),u=e("./scene"),l=n(u),c=e("./geo"),f=n(c),h=e("./utils/debounce"),d=n(h),p=r.LeafletLayer=void 0},{"./geo":201,"./scene":226,"./utils/debounce":254,"./utils/thread":265}],223:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function o(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function a(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var s=function(){function e(e,t){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=e[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!t||r.length!==t);n=!0);}catch(u){i=!0,o=u}finally{try{!n&&s["return"]&&s["return"]()}finally{if(i)throw o}}return r}return function(t,r){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return e(t,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),u=function R(e,t,r){null===e&&(e=Function.prototype);var n=Object.getOwnPropertyDescriptor(e,t);if(void 0===n){var i=Object.getPrototypeOf(e);return null===i?void 0:R(i,t,r)}if("value"in n)return n.value;var o=n.get;return void 0===o?void 0:o.call(r)},l=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),c=e("./gl/shader_program"),f=n(c),h=e("./gl/glsl"),d=n(h),p=e("./geo"),_=n(p),m=e("./vector"),g=n(m),v=e("./styles/style_parser"),y="/*\n\nExpected globals:\nlight_accumulator_*\n\n*/\n\nstruct AmbientLight {\n    vec3 ambient;\n};\n\nvoid calculateLight(in AmbientLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n    light_accumulator_ambient.rgb += _light.ambient;\n}\n",b="/*\n\nExpected globals:\nmaterial\nlight_accumulator_*\n\n*/\n\nstruct DirectionalLight {\n    vec3 ambient;\n    vec3 diffuse;\n    vec3 specular;\n    vec3 direction;\n};\n\nvoid calculateLight(in DirectionalLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n\n    light_accumulator_ambient.rgb += _light.ambient;\n\n    float nDotVP = clamp(dot(_normal, -_light.direction), 0.0, 1.0);\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        light_accumulator_diffuse.rgb += _light.diffuse * nDotVP;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        float pf = 0.0;\n        if (nDotVP > 0.0) {\n            vec3 reflectVector = reflect(_light.direction, _normal);\n            float eyeDotR = max(dot(normalize(_eyeToPoint), reflectVector), 0.0);\n            pf = pow(eyeDotR, material.shininess);\n        }\n        light_accumulator_specular.rgb += _light.specular * pf;\n    #endif\n}\n",x="/*\n\nExpected globals:\nmaterial\nlight_accumulator_*\n\n*/\n\nstruct PointLight {\n    vec3 ambient;\n    vec3 diffuse;\n    vec3 specular;\n    vec4 position;\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n    float attenuationExponent;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n    float innerRadius;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n    float outerRadius;\n#endif\n};\n\nvoid calculateLight(in PointLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n\n    float dist = length(_light.position.xyz - _eyeToPoint);\n\n    // Compute vector from surface to light position\n    vec3 VP = (_light.position.xyz - _eyeToPoint) / dist;\n\n    // Normalize the vector from surface to light position\n    float nDotVP = clamp(dot(VP, _normal), 0.0, 1.0);\n\n    // Attenuation defaults\n    float attenuation = 1.0;\n    #ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n        float Rin = 1.0;\n        float e = _light.attenuationExponent;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n        #endif\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n            float Rdiff = _light.outerRadius-Rin;\n            float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n            attenuation = 1.0-(pow(d,e));\n        #else\n            // If no outer is provide behaves like:\n            // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n            float d = max(0.0,dist-Rin)/Rin+1.0;\n            attenuation = clamp(1.0/(pow(d,e)), 0.0, 1.0);\n        #endif\n    #else\n        float Rin = 0.0;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float Rdiff = _light.outerRadius-Rin;\n                float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                // If no outer is provide behaves like:\n                // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n                float d = max(0.0,dist-Rin)/Rin+1.0;\n                attenuation = clamp(1.0/d, 0.0, 1.0);\n            #endif\n        #else\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float d = clamp(dist/_light.outerRadius, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                attenuation = 1.0;\n            #endif\n        #endif\n    #endif\n\n    // Computer accumulators\n    light_accumulator_ambient.rgb += _light.ambient * attenuation;\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        light_accumulator_diffuse.rgb += _light.diffuse * nDotVP * attenuation;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        float pf = 0.0; // power factor for shiny speculars\n        if (nDotVP > 0.0) {\n            vec3 reflectVector = reflect(-VP, _normal);\n            float eyeDotR = max(0.0, dot(-normalize(_eyeToPoint), reflectVector));\n            pf = pow(eyeDotR, material.shininess);\n        }\n\n        light_accumulator_specular.rgb += _light.specular * pf * attenuation;\n    #endif\n}\n",w="/*\n\nExpected globals:\nmaterial\nlight_accumulator_*\n\n*/\n\nstruct SpotLight {\n    vec3 ambient;\n    vec3 diffuse;\n    vec3 specular;\n    vec4 position;\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n    float attenuationExponent;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n    float innerRadius;\n#endif\n\n#ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n    float outerRadius;\n#endif\n\n    vec3 direction;\n    float spotCosCutoff;\n    float spotExponent;\n};\n\nvoid calculateLight(in SpotLight _light, in vec3 _eyeToPoint, in vec3 _normal) {\n\n    float dist = length(_light.position.xyz - _eyeToPoint);\n\n    // Compute vector from surface to light position\n    vec3 VP = (_light.position.xyz - _eyeToPoint) / dist;\n\n    // normal . light direction\n    float nDotVP = clamp(dot(_normal, VP), 0.0, 1.0);\n\n    // Attenuation defaults\n    float attenuation = 1.0;\n    #ifdef TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT\n        float Rin = 1.0;\n        float e = _light.attenuationExponent;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n        #endif\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n            float Rdiff = _light.outerRadius-Rin;\n            float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n            attenuation = 1.0-(pow(d,e));\n        #else\n            // If no outer is provide behaves like:\n            // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n            float d = max(0.0,dist-Rin)/Rin+1.0;\n            attenuation = clamp(1.0/(pow(d,e)), 0.0, 1.0);\n        #endif\n    #else\n        float Rin = 0.0;\n\n        #ifdef TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS\n            Rin = _light.innerRadius;\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float Rdiff = _light.outerRadius-Rin;\n                float d = clamp(max(0.0,dist-Rin)/Rdiff, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                // If no outer is provide behaves like:\n                // https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/\n                float d = max(0.0,dist-Rin)/Rin+1.0;\n                attenuation = clamp(1.0/d, 0.0, 1.0);\n            #endif\n        #else\n            #ifdef TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS\n                float d = clamp(dist/_light.outerRadius, 0.0, 1.0);\n                attenuation = 1.0-d*d;\n            #else\n                attenuation = 1.0;\n            #endif\n        #endif\n    #endif\n\n    // spotlight attenuation factor\n    float spotAttenuation = 0.0;\n\n    // See if point on surface is inside cone of illumination\n    float spotDot = clamp(dot(-VP, _light.direction), 0.0, 1.0);\n\n    if (spotDot >= _light.spotCosCutoff) {\n        spotAttenuation = pow(spotDot, _light.spotExponent);\n    }\n\n    light_accumulator_ambient.rgb += _light.ambient * attenuation * spotAttenuation;\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        light_accumulator_diffuse.rgb += _light.diffuse * nDotVP * attenuation * spotAttenuation;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        // Power factor for shiny speculars\n        float pf = 0.0;\n        if (nDotVP > 0.0) {\n            vec3 reflectVector = reflect(-VP, _normal);\n            float eyeDotR = max(dot(-normalize(_eyeToPoint), reflectVector), 0.0);\n            pf = pow(eyeDotR, material.shininess);\n        }\n        light_accumulator_specular.rgb += _light.specular * pf * attenuation * spotAttenuation;\n    #endif\n}\n",k=function(){function e(t,r){a(this,e),this.name=r.name,this.view=t,this.ambient=null==r.ambient||"number"==typeof r.ambient?d.default.expandVec3(r.ambient||0):v.StyleParser.parseColor(r.ambient).slice(0,3),this.diffuse=null==r.diffuse||"number"==typeof r.diffuse?d.default.expandVec3(null!=r.diffuse?r.diffuse:1):v.StyleParser.parseColor(r.diffuse).slice(0,3),this.specular=null==r.specular||"number"==typeof r.specular?d.default.expandVec3(r.specular||0):v.StyleParser.parseColor(r.specular).slice(0,3)}return l(e,[{key:"inject",value:function(){var t="\n            uniform "+this.struct_name+" u_"+this.name+";\n            "+this.struct_name+" "+this.name+";\n            ",r="\n            "+this.name+" = u_"+this.name+";\n\n        ";f.default.addBlock(e.block,t),f.default.addBlock("setup",r)}},{key:"update",value:function(){}},{key:"setupProgram",value:function(e){e.uniform("3fv","u_"+this.name+".ambient",this.ambient),e.uniform("3fv","u_"+this.name+".diffuse",this.diffuse),e.uniform("3fv","u_"+this.name+".specular",this.specular)}}],[{key:"create",value:function(t,r){return e.types[r.type]?new e.types[r.type](t,r):void 0}},{key:"setMode",value:function(t,r){t===!0&&(t="fragment"),t=e.enabled&&(null!=t?t:"fragment"),r.defines.TANGRAM_LIGHTING_FRAGMENT="fragment"===t,r.defines.TANGRAM_LIGHTING_VERTEX="vertex"===t}},{key:"inject",value:function(t){if(f.default.removeBlock(e.block),e.enabled){var r="";if(t&&Object.keys(t).length>0){var n={};for(var i in t)n[t[i].type]=!0;for(var o in n)e.types[o].inject();for(var a in t)t[a].inject(),r+="calculateLight("+a+", _eyeToPoint, _normal);\n"}var s="\n            vec4 calculateLighting(in vec3 _eyeToPoint, in vec3 _normal, in vec4 _color) {\n\n                // Do initial material calculations over normal, emission, ambient, diffuse and specular values\n                calculateMaterial(_eyeToPoint,_normal);\n\n                // Un roll the loop of individual ligths to calculate\n                "+r+"\n\n                //  Final light intensity calculation\n                vec4 color = vec4(vec3(0.), _color.a); // start with vertex color alpha\n\n                #ifdef TANGRAM_MATERIAL_EMISSION\n                    color.rgb = material.emission.rgb;\n                    color.a *= material.emission.a;\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_AMBIENT\n                    color.rgb += light_accumulator_ambient.rgb * _color.rgb * material.ambient.rgb;\n                    color.a *= material.ambient.a;\n                #else\n                    #ifdef TANGRAM_MATERIAL_DIFFUSE\n                        color.rgb += light_accumulator_ambient.rgb * _color.rgb * material.diffuse.rgb;\n                    #endif\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_DIFFUSE\n                    color.rgb += light_accumulator_diffuse.rgb * _color.rgb * material.diffuse.rgb;\n                    color.a *= material.diffuse.a;\n                #endif\n\n                #ifdef TANGRAM_MATERIAL_SPECULAR\n                    color.rgb += light_accumulator_specular.rgb * material.specular.rgb;\n                    color.a *= material.specular.a;\n                #endif\n\n                // Clamp final color\n                color = clamp(color, 0.0, 1.0);\n\n                return color;\n            }";f.default.addBlock(e.block,s)}}}]),e}();r.default=k,k.types={},k.block="lighting",k.enabled=!0;var A=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.type="ambient",n.struct_name="AmbientLight",n}return o(t,e),l(t,[{key:"setupProgram",value:function(e){e.uniform("3fv","u_"+this.name+".ambient",this.ambient)}}],[{key:"inject",value:function(){f.default.addBlock(k.block,y)}}]),t}(k);k.types.ambient=A;var T=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));if(n.type="directional",n.struct_name="DirectionalLight",r.direction)n._direction=r.direction;else{var o=135,s=Math.sin(60*Math.PI/180);n._direction=[Math.cos(Math.PI*o/180)*s,Math.sin(Math.PI*o/180)*s,-.5],null==r.ambient&&(n.ambient=d.default.expandVec3(.5))}return n.direction=n._direction.map(parseFloat),n}return o(t,e),l(t,[{key:"setupProgram",value:function(e){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"setupProgram",this).call(this,e),e.uniform("3fv","u_"+this.name+".direction",this.direction)}},{key:"direction",get:function(){return this._direction},set:function(e){this._direction=g.default.normalize(e)}}],[{key:"inject",value:function(){f.default.addBlock(k.block,b)}}]),t}(k);k.types.directional=T;var E=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.type="point",n.struct_name="PointLight",n.position=r.position||[0,0,"100px"],n.position_eye=[],n.origin=r.origin||"ground",n.attenuation=isNaN(parseFloat(r.attenuation))?0:parseFloat(r.attenuation),n.radius=r.radius?Array.isArray(r.radius)&&2===r.radius.length?r.radius:[null,r.radius]:null,n}return o(t,e),l(t,[{key:"inject",value:function(){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"inject",this).call(this),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT=0!==this.attenuation,f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS=null!=this.radius&&null!=this.radius[0],f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS=null!=this.radius}},{key:"update",value:function(){this.updateEyePosition()}},{key:"updateEyePosition",value:function(){if("world"===this.origin){var e=_.default.latLngToMeters(this.position),t=s(e,2),r=t[0],n=t[1];this.position_eye[0]=r-this.view.camera.position_meters[0],this.position_eye[1]=n-this.view.camera.position_meters[1],this.position_eye[2]=v.StyleParser.convertUnits(this.position[2],{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)}),this.position_eye[2]=this.position_eye[2]-this.view.camera.position_meters[2]}else("ground"===this.origin||"camera"===this.origin)&&(this.position_eye=v.StyleParser.convertUnits(this.position,{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)}),"ground"===this.origin&&(this.position_eye[2]=this.position_eye[2]-this.view.camera.position_meters[2]));this.position_eye[3]=1}},{key:"setupProgram",value:function(e){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"setupProgram",this).call(this,e),e.uniform("4fv","u_"+this.name+".position",this.position_eye),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_EXPONENT&&e.uniform("1f","u_"+this.name+".attenuationExponent",this.attenuation),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_INNER_RADIUS&&e.uniform("1f","u_"+this.name+".innerRadius",v.StyleParser.convertUnits(this.radius[0],{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)})),f.default.defines.TANGRAM_POINTLIGHT_ATTENUATION_OUTER_RADIUS&&e.uniform("1f","u_"+this.name+".outerRadius",v.StyleParser.convertUnits(this.radius[1],{zoom:this.view.zoom,meters_per_pixel:_.default.metersPerPixel(this.view.zoom)}))}}],[{key:"inject",value:function(){f.default.addBlock(k.block,x)}}]),t}(k);k.types.point=E;var S=function(e){function t(e,r){a(this,t);var n=i(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.type="spotlight",n.struct_name="SpotLight",n.direction=n._direction=(r.direction||[0,0,-1]).map(parseFloat),n.exponent=r.exponent?parseFloat(r.exponent):.2,n.angle=r.angle?parseFloat(r.angle):20,n}return o(t,e),l(t,[{key:"setupProgram",value:function(e){u(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"setupProgram",this).call(this,e),e.uniform("3fv","u_"+this.name+".direction",this.direction),e.uniform("1f","u_"+this.name+".spotCosCutoff",Math.cos(3.14159*this.angle/180)),e.uniform("1f","u_"+this.name+".spotExponent",this.exponent)}},{key:"direction",get:function(){return this._direction},set:function(e){this._direction=g.default.normalize(e)}}],[{key:"inject",value:function(){f.default.addBlock(k.block,w)}}]),t}(E);k.types.spotlight=S},{"./geo":201,"./gl/glsl":205,"./gl/shader_program":207,"./styles/style_parser":245,"./vector":270}],224:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./gl/glsl"),s=n(a),u=e("./styles/style_parser"),l="/*\n\nDefines globals:\nmaterial\nlight_accumulator_*\n\n*/\n\n\n// MATERIALS\n//\nstruct Material {\n    #ifdef TANGRAM_MATERIAL_EMISSION\n        vec4 emission;\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE\n            vec3 emissionScale;\n        #endif\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_AMBIENT\n        vec4 ambient;\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE\n            vec3 ambientScale;\n        #endif\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_DIFFUSE\n        vec4 diffuse;\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE\n            vec3 diffuseScale;\n        #endif\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_SPECULAR\n        vec4 specular;\n        float shininess;\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE\n            vec3 specularScale;\n        #endif\n    #endif\n\n\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE\n        vec3 normalScale;\n        float normalAmount;\n    #endif\n};\n\n// Note: uniform is copied to a global instance to allow modification\nuniform Material u_material;\nMaterial material;\n\n#ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE\nuniform sampler2D u_material_emission_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE\nuniform sampler2D u_material_ambient_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE\nuniform sampler2D u_material_diffuse_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE\nuniform sampler2D u_material_specular_texture;\n#endif\n\n#ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE\nuniform sampler2D u_material_normal_texture;\n#endif\n\n// Global light accumulators for each property\nvec4 light_accumulator_ambient = vec4(vec3(0.0), 1.);\nvec4 light_accumulator_diffuse = vec4(vec3(0.0), 1.);\n#ifdef TANGRAM_MATERIAL_SPECULAR\n    vec4 light_accumulator_specular = vec4(vec3(0.0), 1.);\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_TEXTURE_SPHEREMAP\nvec4 getSphereMap (in sampler2D _tex, in vec3 _eyeToPoint, in vec3 _normal, in vec2 _skew) {\n    vec3 eye = normalize(_eyeToPoint);\n    eye.xy -= _skew;\n    eye = normalize(eye);\n\n    vec3 r = reflect(eye, _normal);\n    r.z += 1.0;\n    float m = 2. * length(r);\n    vec2 uv = r.xy / m + .5;\n    return texture2D(_tex, uv);\n}\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_TEXTURE_TRIPLANAR\nvec3 getTriPlanarBlend (in vec3 _normal) {\n    vec3 blending = abs(_normal);\n    blending = normalize(max(blending, 0.00001));\n    float b = (blending.x + blending.y + blending.z);\n    return blending / b;\n}\n\nvec4 getTriPlanar (in sampler2D _tex, in vec3 _pos, in vec3 _normal, in vec3 _scale) {\n    vec3 blending = getTriPlanarBlend(_normal);\n    vec4 xaxis = texture2D(_tex, fract(_pos.yz * _scale.x));\n    vec4 yaxis = texture2D(_tex, fract(_pos.xz * _scale.y));\n    vec4 zaxis = texture2D(_tex, fract(_pos.xy * _scale.z));\n    return  xaxis * blending.x + yaxis * blending.y + zaxis * blending.z;\n}\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_TEXTURE_PLANAR\nvec4 getPlanar (in sampler2D _tex, in vec3 _pos, in vec2 _scale) {\n    return texture2D( _tex, fract(_pos.xy * _scale.x) );\n}\n#endif\n\n\n#ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE\nvoid calculateNormal (inout vec3 _normal) {\n    // Get NORMALMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE_UV\n    _normal += texture2D(u_material_normal_texture, fract(v_texcoord*material.normalScale.xy)).rgb*2.0-1.0;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE_PLANAR\n    vec3 normalTex = getPlanar(u_material_normal_texture, v_world_position.xyz, material.normalScale.xy).rgb*2.0-1.0;\n    _normal += normalTex;\n    #endif\n\n    #ifdef TANGRAM_MATERIAL_NORMAL_TEXTURE_TRIPLANAR\n    vec3 normalTex = getTriPlanar(u_material_normal_texture, v_world_position.xyz, _normal, material.normalScale).rgb*2.0-1.0;\n    _normal += normalTex;\n    #endif\n\n    _normal = normalize(_normal);\n}\n#endif\n\nvoid calculateMaterial (in vec3 _eyeToPoint, inout vec3 _normal) {\n    // get EMISSION TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_UV\n        material.emission *= texture2D(u_material_emission_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_PLANAR\n        material.emission *= getPlanar(u_material_emission_texture, v_world_position.xyz, material.emissionScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_TRIPLANAR\n        material.emission *= getTriPlanar(u_material_emission_texture, v_world_position.xyz, _normal, material.emissionScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_EMISSION_TEXTURE_SPHEREMAP\n        material.emission *= getSphereMap(u_material_emission_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n\n    // get AMBIENT TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_UV\n        material.ambient *= texture2D(u_material_ambient_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_PLANAR\n        material.ambient *= getPlanar(u_material_ambient_texture, v_world_position.xyz, material.ambientScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_TRIPLANAR\n        material.ambient *= getTriPlanar(u_material_ambient_texture, v_world_position.xyz, _normal, material.ambientScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_AMBIENT_TEXTURE_SPHEREMAP\n        material.ambient *= getSphereMap(u_material_ambient_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n\n    // get DIFFUSE TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_UV\n        material.diffuse *= texture2D(u_material_diffuse_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_PLANAR\n        material.diffuse *= getPlanar(u_material_diffuse_texture, v_world_position.xyz, material.diffuseScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_TRIPLANAR\n        material.diffuse *= getTriPlanar(u_material_diffuse_texture, v_world_position.xyz, _normal, material.diffuseScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_DIFFUSE_TEXTURE_SPHEREMAP\n        material.diffuse *= getSphereMap(u_material_diffuse_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n\n    // get SPECULAR TEXTUREMAP\n    //------------------------------------------------\n    #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_UV\n        material.specular *= texture2D(u_material_specular_texture,v_texcoord);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_PLANAR\n        material.specular *= getPlanar(u_material_specular_texture, v_world_position.xyz, material.specularScale.xy);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_TRIPLANAR\n        material.specular *= getTriPlanar(u_material_specular_texture, v_world_position.xyz, _normal, material.specularScale);\n        #endif\n\n        #ifdef TANGRAM_MATERIAL_SPECULAR_TEXTURE_SPHEREMAP\n        material.specular *= getSphereMap(u_material_specular_texture, _eyeToPoint, _normal, u_vanishing_point);\n        #endif\n    #endif\n}\n",c=["emission","ambient","diffuse","specular"],f=function(){function e(t){var r=this;
+i(this,e),t=t||{},c.forEach(function(e){var n=t[e];null!=n&&(r[e]=n.texture?{texture:n.texture,mapping:n.mapping||"spheremap",scale:s.default.expandVec3(null!=n.scale?n.scale:1),amount:s.default.expandVec4(null!=n.amount?n.amount:1)}:"number"==typeof n||Array.isArray(n)?{amount:s.default.expandVec4(n)}:"string"==typeof n?{amount:u.StyleParser.parseColor(n)}:n)}),this.specular&&(this.specular.shininess=t.shininess?parseFloat(t.shininess):.2),null!=t.normal&&(this.normal={texture:t.normal.texture,mapping:t.normal.mapping||"triplanar",scale:s.default.expandVec3(null!=t.normal.scale?t.normal.scale:1),amount:null!=t.normal.amount?t.normal.amount:1})}return o(e,[{key:"inject",value:function(t){var r=this;c.forEach(function(e){var n="TANGRAM_MATERIAL_"+e.toUpperCase(),i=n+"_TEXTURE";t.defines[n]=null!=r[e],r[e]&&r[e].texture&&(t.defines[i]=!0,t.defines[i+"_"+r[e].mapping.toUpperCase()]=!0,t.defines["TANGRAM_MATERIAL_TEXTURE_"+r[e].mapping.toUpperCase()]=!0,t.texcoords=t.texcoords||"uv"===r[e].mapping)}),this.normal&&this.normal.texture&&(t.defines.TANGRAM_MATERIAL_NORMAL_TEXTURE=!0,t.defines["TANGRAM_MATERIAL_NORMAL_TEXTURE_"+this.normal.mapping.toUpperCase()]=!0,t.defines["TANGRAM_MATERIAL_TEXTURE_"+this.normal.mapping.toUpperCase()]=!0,t.texcoords=t.texcoords||"uv"===this.normal.mapping),t.replaceShaderBlock(e.block,l,"Material"),t.addShaderBlock("setup","\nmaterial = u_material;\n","Material")}},{key:"setupProgram",value:function(e){var t=this;c.forEach(function(r){t[r]&&(t[r].texture?(e.setTextureUniform("u_material_"+r+"_texture",t[r].texture),e.uniform("3fv","u_material."+r+"Scale",t[r].scale),e.uniform("4fv","u_material."+r,t[r].amount)):t[r].amount&&e.uniform("4fv","u_material."+r,t[r].amount))}),this.specular&&e.uniform("1f","u_material.shininess",this.specular.shininess),this.normal&&this.normal.texture&&(e.setTextureUniform("u_material_normal_texture",this.normal.texture),e.uniform("3fv","u_material.normalScale",this.normal.scale),e.uniform("1f","u_material.normalAmount",this.normal.amount))}}],[{key:"isValid",value:function(e){return null==e?!1:null==e.emission&&null==e.ambient&&null==e.diffuse&&null==e.specular?!1:!0}}]),e}();r.default=f,f.block="material"},{"./gl/glsl":205,"./styles/style_parser":245}],225:[function(e,t){"use strict";function r(e){return e&&e.__esModule?e:{"default":e}}e("./utils/polyfills");var n=e("./leaflet_layer"),i=e("./scene"),o=r(i),a=e("./scene_worker"),s=e("./utils/version"),u=r(s),l=e("./utils/log"),c=r(l),f=e("./utils/thread"),h=r(f),d=e("./utils/utils"),p=r(d),_=e("./geo"),m=r(_),g=e("./vector"),v=r(g),y=e("./sources/data_source"),b=r(y);e("./sources/geojson"),e("./sources/topojson"),e("./sources/mvt"),e("./sources/raster");var x=e("./gl/glsl"),w=r(x),k=e("./gl/shader_program"),A=r(k),T=e("./gl/vertex_data"),E=r(T),S=e("./gl/texture"),R=r(S),M=e("./material"),O=r(M),P=e("./light"),z=r(P),L=e("./utils/worker_broker"),N=r(L),j=e("./styles/layer"),I=e("./styles/style_manager"),C=e("./styles/style_parser"),F=e("./labels/collision"),U=r(F),D=e("./selection"),B=r(D),G=e("./styles/text/canvas_text"),V=r(G),q=e("./utils/debug_settings"),W=r(q),Z=e("js-yaml"),H=r(Z),X=e("jszip"),Y=r(X),J={log:c.default,yaml:H.default,Thread:h.default,Utils:p.default,Geo:m.default,Vector:v.default,DataSource:b.default,GLSL:w.default,ShaderProgram:A.default,VertexData:E.default,Texture:R.default,Material:O.default,Light:z.default,Scene:o.default,SceneWorker:a.SceneWorker,WorkerBroker:N.default,layerCache:j.layerCache,StyleManager:I.StyleManager,StyleParser:C.StyleParser,Collision:U.default,FeatureSelection:B.default,CanvasText:V.default,debugSettings:W.default};h.default.is_main&&(p.default.requestAnimationFramePolyfill(),void 0===window.Promise&&(window.Promise=Promise,Y.default.external.Promise=Promise)),t.exports={leafletLayer:n.leafletLayer,debug:J,version:u.default}},{"./geo":201,"./gl/glsl":205,"./gl/shader_program":207,"./gl/texture":208,"./gl/vertex_data":211,"./labels/collision":214,"./leaflet_layer":222,"./light":223,"./material":224,"./scene":226,"./scene_worker":229,"./selection":230,"./sources/data_source":231,"./sources/geojson":232,"./sources/mvt":233,"./sources/raster":234,"./sources/topojson":235,"./styles/layer":237,"./styles/style_manager":244,"./styles/style_parser":245,"./styles/text/canvas_text":246,"./utils/debug_settings":255,"./utils/log":259,"./utils/polyfills":263,"./utils/thread":265,"./utils/utils":267,"./utils/version":268,"./utils/worker_broker":269,"./vector":270,"js-yaml":97,jszip:133}],226:[function(e,i,o){"use strict";function a(e){if(e&&e.__esModule)return e;var t={};if(null!=e)for(var r in e)Object.prototype.hasOwnProperty.call(e,r)&&(t[r]=e[r]);return t.default=e,t}function s(e){return e&&e.__esModule?e:{"default":e}}function u(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function l(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(o,"__esModule",{value:!0});var c="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},f=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),h=e("./utils/log"),d=s(h),p=e("./utils/utils"),_=s(p),m=e("./utils/urls"),g=a(m),v=e("./utils/worker_broker"),y=s(v),b=e("./utils/subscribe"),x=s(b),w=e("./gl/context"),k=s(w),A=e("./gl/texture"),T=s(A),E=e("./gl/shader_program"),S=s(E),R=e("./gl/vao"),M=s(R),O=e("./styles/style_manager"),P=e("./styles/style"),z=e("./styles/style_parser"),L=e("./scene_loader"),N=s(L),j=e("./view"),I=s(j),C=e("./light"),F=s(C),U=e("./tile_manager"),D=s(U),B=e("./sources/data_source"),G=s(B),V=e("./selection"),q=s(V),W=e("./gl/render_state"),Z=s(W),H=e("./styles/text/canvas_text"),X=s(H),Y=e("./styles/text/font_manager"),J=s(Y),K=e("./utils/media_capture"),$=s(K),Q=function(){function e(t,r){l(this,e),r=r||{},x.default(this),this.id=e.id++,this.initialized=!1,this.initializing=null,this.sources={},this.view=new I.default(this,r),this.tile_manager=new D.default({scene:this,view:this.view}),this.num_workers=r.numWorkers||2,r.disableVertexArrayObjects===!0&&(M.default.disabled=!0),_.default.use_high_density_display=void 0!==r.highDensityDisplay?r.highDensityDisplay:!0,_.default.updateDevicePixelRatio(),this.config=null,this.config_source=t,this.config_bundle=null,this.last_valid_config_source=null,this.styles=null,this.style_manager=new O.StyleManager,this.building=null,this.dirty=!0,this.animated=!1,this.preUpdate=r.preUpdate,this.postUpdate=r.postUpdate,this.render_loop=!r.disableRenderLoop,this.render_loop_active=!1,this.render_loop_stop=!1,this.render_count=0,this.last_render_count=0,this.render_count_changed=!1,this.frame=0,this.last_main_render=-1,this.last_selection_render=-1,this.media_capture=new $.default,this.selection=null,this.introspection=!1,this.resetTime(),this.container=r.container,this.canvas=null,this.contextOptions=r.webGLContextOptions,this.lights=null,this.background=null,this.createListeners(),this.updating=0,this.generation=e.generation,this.last_complete_generation=e.generation,this.setupDebug(),this.log_level=r.logLevel||"warn",d.default.setLevel(this.log_level),d.default.reset()}return f(e,[{key:"load",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:null,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};if(this.initializing)return this.initializing;d.default.reset(),this.updating++,this.initialized=!1,r="string"==typeof r?{config_path:r}:r;var n=r.config_path;return r.blocking=void 0!==r.blocking?r.blocking:!0,this.createCanvas(),this.initializing=this.loadScene(t,n).then(function(){return e.createWorkers()}).then(function(){e.resetFeatureSelection();var t="object"===c(e.config_source)||e.hasSubscribersFor("load"),n=e.updateConfig({serialize_funcs:t,load_event:!0,fade_in:!0});return r.blocking===!0?n:void 0}).then(function(){e.updating--,e.initializing=null,e.initialized=!0,e.last_valid_config_source=e.config_source,e.last_valid_config_path=e.config_path,e.render_loop!==!1&&e.setupRenderLoop(),e.requestRedraw()}).catch(function(t){e.initializing=null,e.updating=0;var r=void 0,n=void 0;if("YAMLException"===t.name?(r="yaml",n="Error parsing scene YAML"):n="Error initializing scene",e.trigger("error",{type:r,message:n,error:t,url:e.config_source}),n="Scene.load() failed to load "+e.config_source+": "+t.message,e.last_valid_config_source)return d.default("warn",n,t),d.default("info","Scene.load() reverting to last valid configuration"),e.load(e.last_valid_config_source,e.last_valid_config_path);throw d.default("error",n,t),t}),this.initializing}},{key:"destroy",value:function(){if(this.initialized=!1,this.render_loop_stop=!0,this.destroyListeners(),this.canvas&&this.canvas.parentNode&&(this.canvas.parentNode.removeChild(this.canvas),this.canvas=null),this.container=null,this.selection&&this.selection.destroy(),this.gl){T.default.destroy(this.gl),this.style_manager.destroy(this.gl),this.styles={},S.default.reset();var e=this.gl.getExtension("WEBGL_lose_context");e&&e.loseContext(),this.gl=null}this.sources={},this.destroyWorkers(),this.tile_manager.destroy(),this.tile_manager=null,d.default.reset()}},{key:"createCanvas",value:function(){if(!this.canvas){this.container=this.container||document.body,this.canvas=document.createElement("canvas"),this.canvas.style.position="absolute",this.canvas.style.top=0,this.canvas.style.left=0,this.container.style.backgroundColor="transparent",this.container.appendChild(this.canvas);try{this.gl=k.default.getContext(this.canvas,Object.assign({alpha:!0,premultipliedAlpha:!0,device_pixel_ratio:_.default.device_pixel_ratio},this.contextOptions))}catch(e){throw new Error("Couldn't create WebGL context. Your browser may not support WebGL, or it's turned off? Visit http://webglreport.com/ for more info.")}this.resizeMap(this.container.clientWidth,this.container.clientHeight),M.default.init(this.gl),this.render_states=new Z.default(this.gl),this.media_capture.setCanvas(this.canvas)}}},{key:"getWorkerUrl",value:function(){var e=void 0;if("undefined"!=typeof t){var i="("+t+")()";if(r){var o=r.slice(0,r.lastIndexOf("/")+1);i+="\n//# sourceMappingURL="+o+n}e=g.createObjectURL(new Blob([i],{type:"application/javascript"}))}if(!e)throw new Error("Couldn't find internal Tangram source variable (may indicate the library did not build correctly)");var a=[].concat(u(this.data_source_scripts));a.push(e);var s="importScripts("+a.map(function(e){return"'"+e+"'"}).join(",")+");";return g.createObjectURL(new Blob([s],{type:"application/javascript"}))}},{key:"updateDataSourceScripts",value:function(){var e,t=this,r=[].concat(u(this.data_source_scripts||[])),n=Object.keys(this.config.sources).map(function(e){return t.config.sources[e].scripts}).filter(function(e){return e});return n.length>0&&d.default("debug","loading custom data source scripts in worker:",n),this.data_source_scripts=(e=[]).concat.apply(e,u(n)).sort(),!(this.data_source_scripts.length===r.length&&this.data_source_scripts.every(function(e,t){return e===r[t]}))}},{key:"createWorkers",value:function(){return this.updateDataSourceScripts()&&this.destroyWorkers(),this.workers?Promise.resolve():this.makeWorkers(this.getWorkerUrl())}},{key:"makeWorkers",value:function(e){var t=this,r=[];this.workers=[];for(var n=function(){o=new Worker(e),t.workers[i]=o,y.default.addWorker(o),d.default("debug","Scene.makeWorkers: initializing worker "+i);var n=i;r.push(y.default.postMessage(o,"self.init",t.id,i,t.num_workers,t.log_level,_.default.device_pixel_ratio).then(function(e){return d.default("debug","Scene.makeWorkers: initialized worker "+e),e},function(e){return d.default("error","Scene.makeWorkers: failed to initialize worker "+n+":",e),Promise.reject(e)}))},i=0;i<this.num_workers;i++){var o;n()}return this.next_worker=0,Promise.all(r).then(function(){d.default.setWorkers(t.workers);var r=t.gl.getExtension("OES_element_index_uint")?!0:!1;y.default.postMessage(t.workers,"VertexElements.setUint32Flag",r),g.revokeObjectURL(e)})}},{key:"destroyWorkers",value:function(){Array.isArray(this.workers)&&(d.default.setWorkers(null),this.workers.forEach(function(e){e.terminate()}),this.workers=null)}},{key:"getWorkerForDataSource",value:function(e){var t=void 0;return e.tiled?(t=this.workers[this.next_worker],this.next_worker=(this.next_worker+1)%this.workers.length):t=this.workers[e.id%this.workers.length],t}},{key:"ready",value:function(){return this.view.ready()&&0!==Object.keys(this.sources).length?!0:!1}},{key:"updateDevicePixelRatio",value:function(){var e=this;_.default.updateDevicePixelRatio()&&y.default.postMessage(this.workers,"self.updateDevicePixelRatio",_.default.device_pixel_ratio).then(function(){return e.rebuild()}).then(function(){return e.resizeMap(e.view.size.css.width,e.view.size.css.height)})}},{key:"resizeMap",value:function(e,t){(0!==e||0!==t)&&(this.dirty=!0,this.view.setViewportSize(e,t),this.gl&&k.default.resize(this.gl,e,t,_.default.device_pixel_ratio))}},{key:"requestRedraw",value:function(){this.dirty=!0}},{key:"immediateRedraw",value:function(){this.dirty=!0,this.update()}},{key:"renderLoop",value:function(){this.render_loop_active=!0,this.initialized&&this.update(),this.render_loop_stop?(this.render_loop_stop=!1,this.render_loop_active=!1):window.requestAnimationFrame(this.renderLoop.bind(this))}},{key:"setupRenderLoop",value:function(){var e=this;this.render_loop_active||setTimeout(function(){e.renderLoop()},0)}},{key:"update",value:function(){var e=this.dirty,t=this.selection?this.selection.hasPendingRequests():!1,r=!(e===!1&&t===!1||this.initialized===!1||this.updating>0||this.ready()===!1);return"function"==typeof this.preUpdate&&this.preUpdate(r),r?(this.dirty=!1,this.updateDevicePixelRatio(),this.render({main:e,selection:t}),this.updateViewComplete(),this.media_capture.completeScreenshot(),"function"==typeof this.postUpdate&&this.postUpdate(r),(this.animated===!0||this.view.isAnimating())&&(this.dirty=!0),this.frame++,d.default("trace","Scene.render()"),!0):!1}},{key:"render",value:function(e){var t=this,r=e.main,n=e.selection,i=this.gl;if(this.view.update(),Object.keys(this.lights).forEach(function(e){return t.lights[e].update()}),r&&(this.render_count=this.renderPass(),this.last_main_render=this.frame),n){if(this.view.panning||this.view.zooming)return void this.selection.clearPendingRequests();!this.selection.locked&&this.last_selection_render<this.last_main_render&&(this.selection.bind(),this.renderPass("selection_program",{allow_blend:!1}),i.bindFramebuffer(i.FRAMEBUFFER,null),i.viewport(0,0,this.canvas.width,this.canvas.height),this.last_selection_render=this.frame),this.selection.read()}return this.render_count_changed=!1,this.render_count!==this.last_render_count&&(this.render_count_changed=!0,this.getFeatureSelectionMapSize().then(function(e){e&&d.default("info","Scene: rendered "+t.render_count+" primitives ("+e+" features in selection map)")})),this.last_render_count=this.render_count,!0}},{key:"renderPass",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"program",r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=r.allow_blend;n=null==n?!0:n,this.clearFrame({clear_color:!0,clear_depth:!0});for(var i=this.tile_manager.getActiveStyles().map(function(t){return e.styles[t]}).filter(function(e){return e}).sort(P.Style.blendOrderSort),o=0,a=void 0,s=0;s<i.length;s++){var u=i[s];if(u.blend!==a){var l=Object.assign({},P.Style.render_states[u.blend],{blend:n&&u.blend});this.setRenderState(l)}o+=this.renderStyle(u.name,t),a=u.blend}return o}},{key:"renderStyle",value:function(e,t){for(var r=this.styles[e],n=!0,i=0,o=void 0,a=this.tile_manager.getRenderableTiles(),s=0;s<a.length;s++){var u=a[s];if(null!=u.meshes[e]){if(n===!0&&(n=!1,o=this.setupStyle(r,t),!o))return 0;if(u.shouldProxyForStyle(e)){this.view.setupTile(u,o);var l=u.meshes[e];r.render(l)&&(this.view.panning||this.view.zooming||this.requestRedraw()),i+=l.geometry_count}}}return i}},{key:"setupStyle",value:function(e,t){var r=void 0;try{if(r=e.getProgram(t),!r)return}catch(n){return void this.trigger("warning",{type:"styles",message:"Error compiling style "+e.name,style:e,shader_errors:e.program&&e.program.shader_errors})}r.use(),e.setup(),r.uniform("1f","u_time",this.animated?(+new Date-this.start_time)/1e3:0),this.view.setupProgram(r);for(var i in this.lights)this.lights[i].setupProgram(r);return r}},{key:"clearFrame",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.clear_color,r=e.clear_depth;if(this.initialized){t=t===!1?!1:!0,r=r===!1?!1:!0,this.render_states.depth_write.set({depth_write:r});var n=this.gl;if(t||r){var i=(t&&n.COLOR_BUFFER_BIT)|(r&&n.DEPTH_BUFFER_BIT);n.clear(i)}}}},{key:"setRenderState",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.depth_test,r=e.depth_write,n=e.cull_face,i=e.blend;if(this.initialized){var o=this.render_states;t=t===!1?!1:o.defaults.depth_test,r=r===!1?!1:o.defaults.depth_write,n=n===!1?!1:o.defaults.culling,i=null!=i?i:o.defaults.blending;var a=this.gl;o.depth_test.set({depth_test:t}),o.depth_write.set({depth_write:r}),o.culling.set({cull:n,face:o.defaults.culling_face}),i?"opaque"===i?o.blending.set({blend:!1}):"overlay"===i||"inlay"===i?o.blending.set({blend:!0,src:a.SRC_ALPHA,dst:a.ONE_MINUS_SRC_ALPHA,src_alpha:a.ONE,dst_alpha:a.ONE_MINUS_SRC_ALPHA}):"add"===i?o.blending.set({blend:!0,src:a.ONE,dst:a.ONE}):"multiply"===i&&o.blending.set({blend:!0,src:a.ZERO,dst:a.SRC_COLOR}):o.blending.set({blend:!1})}}},{key:"getFeatureAt",value:function(e){if(!this.initialized)return d.default("debug","Scene.getFeatureAt() called before scene was initialized"),Promise.resolve();var t={x:e.x*_.default.device_pixel_ratio/this.view.size.device.width,y:e.y*_.default.device_pixel_ratio/this.view.size.device.height};return this.selection.getFeatureAt(t).then(function(t){return Object.assign(t,{pixel:e})}).catch(function(e){return Promise.resolve({error:e})})}},{key:"rebuild",value:function(){var e=this,t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},r=t.sync,n=void 0===r?!0:r,i=t.sources,o=void 0===i?null:i,a=t.serialize_funcs,s=t.profile,u=void 0===s?!1:s,l=t.fade_in,c=void 0===l?!1:l;return new Promise(function(t,r){if(e.building){e.building.queued&&e.building.queued.reject&&(d.default("debug","Scene.rebuild: request superceded by a newer call"),e.building.queued.resolve(!1));var i={sync:n,sources:o,serialize_funcs:a,profile:u,fade_in:c};return e.building.queued={resolve:t,reject:r,options:i},void d.default("trace","Scene.rebuild(): queuing 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this.config_source=t||this.config_source,this.config_globals_applied=[],this.config_path=g.pathForURL("string"==typeof this.config_source?r||this.config_source:r),N.default.loadScene(this.config_source,this.config_path).then(function(t){var r=t.config,n=t.bundle;return e.config=r,e.config_bundle=n,e.config})}},{key:"setDataSource",value:function(e,t){if(!e||!t||!t.type||!t.url&&!t.data)return void d.default("error","No name provided or not a valid config:",e,t);var r=null==this.config.sources[e],n=this.config.sources[e]=Object.assign({},t);return n.data&&"object"===c(n.data)&&(n.url=g.createObjectURL(new Blob([JSON.stringify(n.data)])),delete n.data),N.default.normalizeDataSource(n,this.config_bundle),r?this.updateConfig({rebuild:{sources:[e]}}):this.rebuild({sources:[e]})}},{key:"createDataSources",value:function(){var e=this,t=[],r=Object.keys(this.sources),n=0;for(var i in this.config.sources){var o=this.config.sources[i],a=this.sources[i];try{var s=Object.assign({},o,{name:i,id:n++});if(this.sources[i]=G.default.create(s,this.sources),!this.sources[i])throw{}}catch(u){delete this.sources[i];var l="Could not create data source: "+u.message;d.default("warn","Scene: "+l,o),this.trigger("warning",{type:"sources",source:o,message:l})}G.default.changed(this.sources[i],a)&&t.push(i)}r.forEach(function(r){e.config.sources[r]||(delete e.sources[r],t.push(r))}),t.length>0&&this.tile_manager.removeTiles(function(e){return t.indexOf(e.source.name)>-1});for(var c in this.config.layers){var f=this.config.layers[c];f.data&&this.sources[f.data.source]&&(this.sources[f.data.source].builds_geometry_tiles=!0)}}},{key:"loadTextures",value:function(){var e=this;return T.default.createFromObject(this.gl,this.config.textures).then(function(){return T.default.createDefault(e.gl)})}},{key:"updateStyles",value:function(){var e=this;if(!this.initialized&&!this.initializing)throw new Error("Scene.updateStyles() called before scene was initialized");this.styles=this.style_manager.build(this.config.styles),this.style_manager.initStyles(this);for(var t in this.styles)this.styles[t].setGL(this.gl);this.animated=void 0!==this.config.scene.animated?this.config.scene.animated:Object.keys(this.styles).some(function(t){return e.styles[t].animated}),this.dirty=!0}},{key:"getActiveCamera",value:function(){return this.view.getActiveCamera()}},{key:"setActiveCamera",value:function(e){return this.view.setActiveCamera(e)}},{key:"createLights",value:function(){this.lights={};for(var e in this.config.lights)if(this.config.lights[e]&&"object"===c(this.config.lights[e])){var t=this.config.lights[e];t.name=e.replace("-","_"),t.visible=t.visible===!1?!1:!0,t.visible&&(this.lights[t.name]=F.default.create(this.view,t))}F.default.inject(this.lights)}},{key:"setBackground",value:function(){var e,t=this.config.scene.background;this.background={},t&&t.color&&(this.background.color=z.StyleParser.parseColor(t.color)),this.background.color||(this.background.color=[0,0,0,0]),this.canvas.style.backgroundColor=1===this.background.color[3]?"rgba("+this.background.color.map(function(e){return Math.floor(255*e)}).join(", ")+")":"transparent",(e=this.gl).clearColor.apply(e,u(this.background.color))}},{key:"setIntrospection",value:function(e){var t=this;return this.introspection=e||!1,this.updating++,this.updateConfig().then(function(){return t.updating--})}},{key:"updateConfig",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},r=t.load_event,n=void 0===r?!1:r,i=t.rebuild,o=void 0===i?!0:i,a=t.serialize_funcs,s=t.fade_in,u=void 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y.default.postMessage(this.workers,"self.updateConfig",{config:n,generation:this.generation,introspection:this.introspection})}},{key:"createListeners",value:function(){var e=this;this.listeners={},this.listeners.view={move:function(){return e.trigger("move")}},this.view.subscribe(this.listeners.view),this.listeners.texture={update:function(){return e.dirty=!0},warning:function(t){return e.trigger("warning",Object.assign({type:"textures"},t))}},T.default.subscribe(this.listeners.texture),this.listeners.scene_loader={error:function(t){return e.trigger("error",Object.assign({type:"scene"},t))}},N.default.subscribe(this.listeners.scene_loader)}},{key:"destroyListeners",value:function(){this.unsubscribeAll(),this.view.unsubscribe(this.listeners.view),T.default.unsubscribe(this.listeners.texture),N.default.unsubscribe(this.listeners.scene_loader),this.listeners=null}},{key:"resetFeatureSelection",value:function(){var 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n=o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,r));return n.tiled=!0,n.parseBounds(e),n.builds_geometry_tiles=!1,n.tms=e.tms===!0,n.url.search("{s}")>-1&&(Array.isArray(e.url_subdomains)&&e.url_subdomains.length>0?(n.url_subdomains=e.url_subdomains,n.next_url_subdomain=0):b.default({level:"warn",once:!0},"Data source '"+n.name+"': source URL includes '{s}' subdomain marker ('"+n.url+"'), but no subdomains were specified in 'url_subdomains' parameter")),n}return a(t,e),f(t,[{key:"parseBounds",value:function(e){if(Array.isArray(e.bounds)&&4===e.bounds.length){this.bounds=e.bounds;var t=c(this.bounds,4),r=t[0],n=t[1],i=t[2],o=t[3];this.bounds_meters={min:d.default.latLngToMeters([r,o]),max:d.default.latLngToMeters([i,n])},this.bounds_tiles={min:{},max:{}}}}},{key:"checkBounds",value:function(e){if(this.bounds){e=d.default.wrapTile(e,{x:!0});var t=this.bounds_tiles.min[e.z];t||(t=this.bounds_tiles.min[e.z]=d.default.tileForMeters(this.bounds_meters.min,e.z));var r=this.bounds_tiles.max[e.z];if(r||(r=this.bounds_tiles.max[e.z]=d.default.tileForMeters(this.bounds_meters.max,e.z)),e.x<t.x||e.x>r.x||e.y<t.y||e.y>r.y)return!1}return!0}},{key:"includesTile",value:function(e,r){return l(t.prototype.__proto__||Object.getPrototypeOf(t.prototype),"includesTile",this).call(this,e,r)&&this.checkBounds(e)?!0:!1}},{key:"formatUrl",value:function(e,t){var r=d.default.wrapTile(t.coords,{x:!0});this.tms&&(r.y=Math.pow(2,r.z)-1-r.y);var n=e.replace("{x}",r.x).replace("{y}",r.y).replace("{z}",r.z);return null!=this.url_subdomains&&(n=n.replace("{s}",this.url_subdomains[this.next_url_subdomain]),this.next_url_subdomain=(this.next_url_subdomain+1)%this.url_subdomains.length),n}},{key:"urlHasTilePattern",value:function(e){return e&&e.search("{x}")>-1&&e.search("{y}")>-1&&e.search("{z}")>-1}}]),t}(k)}},{"../geo":201,"../utils/errors":256,"../utils/log":259,"../utils/urls":266,"../utils/utils":267}],232:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function a(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function s(e,t,r){var n=m.default.centroid(e);if(n){var i={};return Object.assign(i,t,r),{type:"Feature",properties:i,geometry:{type:"Point",coordinates:n}}}}Object.defineProperty(r,"__esModule",{value:!0}),r.GeoJSONTileSource=r.GeoJSONSource=void 0;var u=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in 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if(s.geometry=p.decodeMultiPolygon(s.geometry),null==s.geometry)continue}i.features.push(s)}}return i}},{key:"formatUrl",value:function(){return this.url}},{key:"parseSourceData",value:function(e,t,r){var n=JSON.parse(r),i=this.getLayers(n);t.layers=this.preprocessLayers(i)}},{key:"preprocessLayers",value:function(e){for(var t in e){var r=e[t];this.preprocessFeatures(r.features)}return"function"==typeof this.transform&&(1===Object.keys(e).length&&e._default?e._default=this.transform(e._default,this.extra_data):e=this.transform(e,this.extra_data)),e}},{key:"preprocessFeatures",value:function(e){if(this.config.generate_label_centroids){var t=[],r={label_placement:!0};e.forEach(function(e){if(null!=e.geometry){var n=void 0,i=void 0;switch(e.geometry.type){case"Polygon":n=e.geometry.coordinates,i=s(n,e.properties,r),t.push(i);break;case"MultiPolygon":n=e.geometry.coordinates;for(var o=-1/0,a=0,u=0;u<n.length;u++){var 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n={coords:t.coords,min:m.default.metersForTile(m.default.wrapTile(t.coords,{x:!0}))};d.default.projectData(r),d.default.scaleData(r,n)}}]),t}(h.NetworkTileSource);d.default.register(b,"GeoJSON")},{"../geo":201,"../utils/log":259,"./data_source":231,"./mvt":233,"geojson-vt":78}],233:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function a(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function s(e){for(var t=[],r=[],n=void 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e=this;if(this.dash){this.dash_background_color&&(this.dash_background_color=o.StyleParser.parseColor(this.dash_background_color),this.defines.TANGRAM_LINE_BACKGROUND_COLOR="vec3("+this.dash_background_color.slice(0,3).join(", ")+")"),this.defines.TANGRAM_DASH_SCALE=20,this.defines.TANGRAM_V_SCALE_ADJUST=m.default.tile_scale*this.defines.TANGRAM_DASH_SCALE;var t=p.default(this.dash,{scale:this.defines.TANGRAM_DASH_SCALE});this.texture="_"+this.name+"_dasharray",l.default.create(this.gl,this.texture,{data:t.pixels,height:t.length,width:1,filtering:"nearest"})}this.texture&&(this.defines.TANGRAM_LINE_TEXTURE=!0,this.defines.TANGRAM_ALPHA_TEST=.5,this.shaders.uniforms=this.shaders.uniforms||{},this.shaders.uniforms.u_texture=this.texture,this.shaders.uniforms.u_texture_ratio=1,l.default.getInfo(this.texture).then(function(t){t&&(e.shaders.uniforms.u_texture_ratio=t.height/t.width)}))},calcWidth:function(e,t){return e&&o.StyleParser.evalCachedDistanceProperty(e,t)||0},calcWidthNextZoom:function(e,t){t.zoom++;var r=this.calcWidth(e,t);return t.zoom--,r},_parseFeature:function(e,t,r){var n=this.feature_style,i=this.calcWidth(t.width,r);if(!(0>i)){var a=this.calcWidthNextZoom(t.next_width,r);if(!(0===i&&0===a||0>a)&&(n.width=i*r.units_per_meter_overzoom,n.next_width=2*a-i,n.next_width*=r.units_per_meter_overzoom,n.next_width/=2,n.color=this.parseColor(t.color,r),n.color)){if(n.z=t.z&&o.StyleParser.evalCachedDistanceProperty(t.z||0,r)||o.StyleParser.defaults.z,n.height=e.properties.height||o.StyleParser.defaults.height,n.extrude=o.StyleParser.evalProperty(t.extrude,r),n.extrude&&("number"==typeof n.extrude?n.height=n.extrude:Array.isArray(n.extrude)&&(n.height=n.extrude[1])),n.extrude&&n.height&&(n.z+=n.height),n.z*=m.default.height_scale,n.height*=m.default.height_scale,n.cap=t.cap,n.join=t.join,n.miter_limit=t.miter_limit,n.tile_edges=t.tile_edges,n.outline=n.outline||{width:{},next_width:{},preprocessed:!0},t.outline&&t.outline.visible!==!1&&t.outline.color&&t.outline.width){var s=2*this.calcWidth(t.outline.width,r),u=2*this.calcWidthNextZoom(t.outline.next_width,r);0===s&&0===u||0>s||0>u?(n.outline.width.value=null,n.outline.next_width.value=null,n.outline.color=null):(n.outline.width.value=s+i,n.outline.next_width.value=u+a,n.outline.color=t.outline.color,n.outline.cap=t.outline.cap||t.cap,n.outline.join=t.outline.join||t.join,n.outline.miter_limit=t.outline.miter_limit||t.miter_limit,n.outline.style=t.outline.style||this.name,n.outline.order=t.outline.order?this.parseOrder(t.outline.order,r):n.order,n.outline.order>n.order&&(n.outline.order=n.order),n.outline.order-=.5)}else n.outline.width.value=null,n.outline.next_width.value=null,n.outline.color=null;return n}}},_preprocess:function(e){return e.color=o.StyleParser.createColorPropertyCache(e.color),e.width=o.StyleParser.createPropertyCache(e.width,o.StyleParser.parseUnits),e.next_width=o.StyleParser.createPropertyCache(e.width,o.StyleParser.parseUnits),e.z=o.StyleParser.createPropertyCache(e.z,o.StyleParser.parseUnits),e.outline&&(e.outline.color=o.StyleParser.createColorPropertyCache(e.outline.color),e.outline.width=o.StyleParser.createPropertyCache(e.outline.width,o.StyleParser.parseUnits),e.outline.next_width=o.StyleParser.createPropertyCache(e.outline.width,o.StyleParser.parseUnits)),e},makeVertexTemplate:function(e){var t=0;return this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=e.z||0,this.vertex_template[t++]=this.scaleOrder(e.order),this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=e.next_width,this.vertex_template[t++]=255*e.color[0],this.vertex_template[t++]=255*e.color[1],this.vertex_template[t++]=255*e.color[2],this.vertex_template[t++]=255*e.color[3],this.selection&&(this.vertex_template[t++]=255*e.selection_color[0],this.vertex_template[t++]=255*e.selection_color[1],this.vertex_template[t++]=255*e.selection_color[2],this.vertex_template[t++]=255*e.selection_color[3]),this.texcoords&&(this.vertex_template[t++]=0,this.vertex_template[t++]=0),this.vertex_template},buildLines:function(e,t,r,n,i){if(this.feature_style=this.outline_feature_style,t.outline&&null!=t.outline.color&&null!=t.outline.width.value){var o=this.styles[t.outline.style];o&&o.addFeature(n.feature,t.outline,n)}this.feature_style=this.inline_feature_style;var a=this.makeVertexTemplate(t);h.buildPolylines(e,t.width,r,a,{cap:t.cap,join:t.join,miter_limit:t.miter_limit,scaling_index:this.vertex_layout.index.a_extrude,scaling_normalize:256,texcoord_index:this.vertex_layout.index.a_texcoord,texcoord_width:(t.width||t.next_width)/n.tile.overzoom2,texcoord_normalize:65535,closed_polygon:i&&i.closed_polygon,remove_tile_edges:!t.tile_edges&&i&&i.remove_tile_edges,tile_edge_tolerance:m.default.tile_scale*n.tile.pad_scale*2})},buildPolygons:function(e,t,r,n){for(var i=0;i<e.length;i++)this.buildLines(e[i],t,r,n,{closed_polygon:!0,remove_tile_edges:!0})}})},{"../../builders/polylines":199,"../../geo":201,"../../gl/constants":202,"../../gl/texture":208,"../../gl/vertex_layout":213,"../polygons/polygons":241,"../style":243,"../style_parser":245,"./dasharray":238}],240:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.Points=void 0;var i=function(){function e(e,t){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=e[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!t||r.length!==t);n=!0);}catch(u){i=!0,o=u}finally{try{!n&&s["return"]&&s["return"]()}finally{if(i)throw o}}return r}return function(t,r){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return e(t,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),o=e("../../utils/log"),a=n(o),s=e("../style"),u=e("../style_parser"),l=e("../../gl/constants"),c=n(l),f=e("../../gl/vertex_layout"),h=n(f),d=e("../../builders/points"),p=e("../../gl/texture"),_=n(p),m=e("../../geo"),g=n(m),v=e("../../vector"),y=n(v),b=e("../../labels/collision"),x=n(b),w=e("../../labels/label_point"),k=n(w),A=e("../../labels/point_placement"),T=n(A),E=e("../text/text_labels"),S=e("../../view"),R=e("../../utils/debug_settings"),M=n(R),O="uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_tile_proxy_depth;\nuniform bool u_tile_fade_in;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\nuniform float u_visible_time;\nuniform bool u_view_panning;\nuniform float u_view_pan_snap_timer;\n\nuniform mat4 u_model;\nuniform mat4 u_modelView;\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nattribute vec4 a_position;\nattribute vec4 a_shape;\nattribute vec4 a_color;\nattribute float a_outline_edge;\nattribute vec4 a_outline_color;\nattribute vec2 a_texcoord;\nattribute vec2 a_offset;\n\n#define PI 3.14159265359\n\n#ifdef TANGRAM_CURVED_LABEL\n    attribute vec4 a_offsets;\n    attribute vec4 a_pre_angles;\n    attribute vec4 a_angles;\n#endif\n\n#define TANGRAM_NORMAL vec3(0., 0., 1.)\n#define TANGRAM_PX_FADE_RANGE 2.\n\nvarying vec4 v_color;\nvarying vec2 v_texcoord;\nvarying vec4 v_world_position;\nvarying float v_alpha_factor;\nvarying float v_aa_factor;\n\n#ifdef TANGRAM_SHADER_POINT\n    varying float v_outline_edge;\n    varying vec4 v_outline_color;\n#endif\n\n#ifdef TANGRAM_MULTI_SAMPLER\n    varying float v_sampler;\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvec2 rotate2D(vec2 _st, float _angle) {\n    return mat2(cos(_angle),-sin(_angle),\n                sin(_angle),cos(_angle)) * _st;\n}\n\n// Assumes stops are [0, 0.33, 0.66, 0.99];\nfloat mix4linear(float a, float b, float c, float d, float x) {\n    return mix(mix(a, b, 3. * x),\n               mix(b,\n                   mix(c, d, 3. * (max(x, .66) - .66)),\n                   3. * (clamp(x, .33, .66) - .33)),\n               step(0.33, x)\n            );\n}\n\n// Determines if a shader-drawn point is being rendered (vs. a sprite or text label)\nbool isShaderPoint() {\n    #ifdef TANGRAM_SHADER_POINT\n        #ifdef TANGRAM_MULTI_SAMPLER\n            if (v_sampler == 0.) { // sprite sampler\n                return true;\n            }\n        #else\n            return true;\n        #endif\n    #endif\n    return false;\n}\n\nvoid main() {\n    // Initialize globals\n    #pragma tangram: setup\n\n    v_alpha_factor = 1.0;\n    v_color = a_color;\n    v_texcoord = a_texcoord;\n    v_aa_factor = 1. / length(a_shape.xy / 256.) * TANGRAM_PX_FADE_RANGE;\n\n    #ifdef TANGRAM_SHADER_POINT\n        v_outline_color = a_outline_color;\n        v_outline_edge = a_outline_edge;\n    #endif\n\n    // Position\n    vec4 position = u_modelView * vec4(a_position.xyz, 1.);\n\n    // Apply positioning and scaling in screen space\n    vec2 shape = a_shape.xy / 256.;                 // values have an 8-bit fraction\n    vec2 offset = vec2(a_offset.x, -a_offset.y);    // flip y to make it point down\n\n    float zoom = clamp(u_map_position.z - u_tile_origin.z, 0., 1.); //fract(u_map_position.z);\n    float theta = a_shape.z / 4096.;\n\n    #ifdef TANGRAM_CURVED_LABEL\n        if (a_offsets[0] != 0.){\n            #ifdef TANGRAM_FADE_ON_ZOOM_IN\n                v_alpha_factor *= clamp(1. + TANGRAM_FADE_ON_ZOOM_IN_RATE - TANGRAM_FADE_ON_ZOOM_IN_RATE * (u_map_position.z - u_tile_origin.z), 0., 1.);\n            #endif\n\n            vec4 angles_scaled = (PI / 16384.) * a_angles;\n            vec4 pre_angles_scaled = (PI / 128.) * a_pre_angles;\n            vec4 offsets_scaled = (1. / 64.) * a_offsets;\n\n            float pre_angle = mix4linear(pre_angles_scaled[0], pre_angles_scaled[1], pre_angles_scaled[2], pre_angles_scaled[3], zoom);\n            float angle = mix4linear(angles_scaled[0], angles_scaled[1], angles_scaled[2], angles_scaled[3], zoom);\n            float offset_curve = mix4linear(offsets_scaled[0], offsets_scaled[1], offsets_scaled[2], offsets_scaled[3], zoom);\n\n            shape = rotate2D(shape, pre_angle); // rotate in place\n            shape.x += offset_curve;            // offset for curved label segment\n            shape = rotate2D(shape, angle);     // rotate relative to curved label anchor\n            shape += rotate2D(offset, theta);   // offset if specified in the scene file\n        }\n        else {\n            shape = rotate2D(shape + offset, theta);\n        }\n    #else\n        shape = rotate2D(shape + offset, theta);\n    #endif\n\n    #ifdef TANGRAM_MULTI_SAMPLER\n        v_sampler = a_shape.w; // texture sampler\n    #endif\n\n    // Fade in (if requested) based on time mesh has been visible.\n    // Value passed to fragment shader in the v_alpha_factor varying\n    #ifdef TANGRAM_FADE_IN_RATE\n        if (u_tile_fade_in) {\n            v_alpha_factor *= clamp(u_visible_time * TANGRAM_FADE_IN_RATE, 0., 1.);\n        }\n    #endif\n\n    // Fade out when tile is zooming out, e.g. acting as proxy tiles\n    // NB: this is mostly done to compensate for text label collision happening at the label's 1x zoom. As labels\n    // in proxy tiles are scaled down, they begin to overlap, and the fade is a simple way to ease the transition.\n    // Value passed to fragment shader in the v_alpha_factor varying\n    #ifdef TANGRAM_FADE_ON_ZOOM_OUT\n        v_alpha_factor *= clamp(1. + TANGRAM_FADE_ON_ZOOM_OUT_RATE * (u_map_position.z - u_tile_origin.z), 0., 1.);\n    #endif\n\n    // World coordinates for 3d procedural textures\n    v_world_position = u_model * position;\n    v_world_position.xy += shape * u_meters_per_pixel;\n    v_world_position = wrapWorldPosition(v_world_position);\n\n    // Modify position before camera projection\n    #pragma tangram: position\n\n    cameraProjection(position);\n\n    #ifdef TANGRAM_LAYER_ORDER\n        // +1 is to keep all layers including proxies > 0\n        applyLayerOrder(a_position.w + u_tile_proxy_depth + 1., position);\n    #endif\n\n    // Apply pixel offset in screen-space\n    // Multiply by 2 is because screen is 2 units wide Normalized Device Coords (and u_resolution device pixels wide)\n    // Device pixel ratio adjustment is because shape is in logical pixels\n    position.xy += shape * position.w * 2. * u_device_pixel_ratio / u_resolution;\n\n    // Snap to pixel grid\n    // Only applied to fully upright sprites/labels (not shader-drawn points), while panning is not active\n    if (!u_view_panning && (abs(theta) < TANGRAM_EPSILON) && !isShaderPoint()) {\n        vec2 position_fract = fract((((position.xy / position.w) + 1.) * .5) * u_resolution);\n        vec2 position_snap = position.xy + ((step(0.5, position_fract) - position_fract) * position.w * 2. / u_resolution);\n\n        // Animate the snapping to smooth the transition and make it less noticeable\n        #ifdef TANGRAM_VIEW_PAN_SNAP_RATE\n            position.xy = mix(position.xy, position_snap, clamp(u_view_pan_snap_timer * TANGRAM_VIEW_PAN_SNAP_RATE, 0., 1.));\n        #else\n            position.xy = position_snap;\n        #endif\n    }\n\n    gl_Position = position;\n}\n",P="uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\nuniform float u_visible_time;\n\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nuniform sampler2D u_texture;\n\n#ifdef TANGRAM_MULTI_SAMPLER\nuniform sampler2D u_label_texture;\nvarying float v_sampler;\n#endif\n\nvarying vec4 v_color;\nvarying vec2 v_texcoord;\nvarying vec4 v_world_position;\nvarying float v_alpha_factor;\nvarying float v_aa_factor;\n\n#ifdef TANGRAM_SHADER_POINT\n    varying vec4 v_outline_color;\n    varying float v_outline_edge;\n#endif\n\n#define TANGRAM_NORMAL vec3(0., 0., 1.)\n\n// Alpha discard threshold (substitute for alpha blending)\n#ifndef TANGRAM_ALPHA_TEST\n#define TANGRAM_ALPHA_TEST 0.5\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvoid main (void) {\n    // Initialize globals\n    #pragma tangram: setup\n\n    vec4 color = v_color;\n\n    #ifdef TANGRAM_MULTI_SAMPLER\n    if (v_sampler == 0.) { // sprite sampler\n    #endif\n        #ifdef TANGRAM_TEXTURE_POINT\n            // Draw sprite\n            color *= texture2D(u_texture, v_texcoord);\n        #else\n            // Draw a point\n            vec2 uv = v_texcoord * 2. - 1.; // fade alpha near circle edge\n            float point_dist = length(uv);\n            color = mix(\n                color,\n                v_outline_color,\n                (1. - smoothstep(v_outline_edge - v_aa_factor, v_outline_edge + v_aa_factor, 1.-point_dist)) * step(.000001, v_outline_edge)\n            );\n            color.a = mix(color.a, 0., (smoothstep(1. - v_aa_factor, 1., point_dist)));\n\n        #endif\n    #ifdef TANGRAM_MULTI_SAMPLER\n    }\n    else { // label sampler\n        color = texture2D(u_label_texture, v_texcoord);\n        color.rgb /= max(color.a, 0.001); // un-multiply canvas texture\n    }\n    #endif\n\n    // Manually un-multiply alpha, for cases where texture has pre-multiplied alpha\n    #ifdef TANGRAM_UNMULTIPLY_ALPHA\n        color.rgb /= max(color.a, 0.001);\n    #endif\n\n    // If blending is off, use alpha discard as a lower-quality substitute\n    #if !defined(TANGRAM_BLEND_OVERLAY) && !defined(TANGRAM_BLEND_INLAY)\n        if (color.a < TANGRAM_ALPHA_TEST) {\n            discard;\n        }\n    #endif\n\n    #pragma tangram: color\n\n    color.a *= v_alpha_factor;\n\n    #pragma tangram: filter\n\n    gl_FragColor = color;\n}\n",z=k.default.PLACEMENT,L=128/Math.PI,N=16384/Math.PI,j=64,I=65535,C=r.Points=Object.create(s.Style);
+Object.assign(C,E.TextLabels),Object.assign(C,{name:"points",built_in:!0,collision:!0,blend:"overlay",init:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:[];s.Style.init.call(this,e),this.vertex_shader_src=O,this.fragment_shader_src=P;var r=[{name:"a_position",size:4,type:c.default.SHORT,normalized:!1},{name:"a_shape",size:4,type:c.default.SHORT,normalized:!1},{name:"a_texcoord",size:2,type:c.default.UNSIGNED_SHORT,normalized:!0},{name:"a_offset",size:2,type:c.default.SHORT,normalized:!1},{name:"a_color",size:4,type:c.default.UNSIGNED_BYTE,normalized:!0}];t.length&&Array.prototype.push.apply(r,t),this.selection=!0,r.push({name:"a_selection_color",size:4,type:c.default.UNSIGNED_BYTE,normalized:!0}),"overlay"!==this.blend&&(this.defines.TANGRAM_LAYER_ORDER=!0),this.shaders.uniforms=this.shaders.uniforms||{},this.shaders.uniforms.u_label_texture=_.default.default,this.texture?(this.defines.TANGRAM_TEXTURE_POINT=!0,this.shaders.uniforms.u_texture=this.texture):(this.defines.TANGRAM_SHADER_POINT=!0,r.push({name:"a_outline_color",size:4,type:c.default.UNSIGNED_BYTE,normalized:!0}),r.push({name:"a_outline_edge",size:1,type:c.default.FLOAT,normalized:!1})),this.vertex_layout=new h.default(r),this.defines.TANGRAM_MULTI_SAMPLER=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT_RATE=2,M.default.suppress_label_fade_in===!0?(this.fade_in_time=0,this.defines.TANGRAM_FADE_IN_RATE=null):(this.fade_in_time=.15,this.defines.TANGRAM_FADE_IN_RATE=1/this.fade_in_time),M.default.suppress_label_snap_animation!==!0&&(this.defines.TANGRAM_VIEW_PAN_SNAP_RATE=1/S.VIEW_PAN_SNAP_TIME),this.collision_group_points=this.name+"-points",this.collision_group_text=this.name+"-text",this.reset()},reset:function(){this.queues={},this.resetText(),this.texture_missing_sprites={}},addFeature:function(e,t,r){var n=r.tile;if(n.generation===this.generation&&(t=this.preprocess(t))){var i={};if(i.color=this.parseColor(t.color,r),i.color||this.texture){var o=void 0;if(this.hasSprites()){if(o=this.parseSprite(t,r),!o)return;i.texcoords=o.texcoords}if(i.size=t.size,i.size?(i.size=u.StyleParser.evalCachedProperty(i.size,r),"number"==typeof i.size&&(i.size=[i.size,i.size])):i.size=o?o.size:[16,16],t.outline&&(i.outline_width=u.StyleParser.evalCachedProperty(t.outline.width,r)||u.StyleParser.defaults.outline.width,i.outline_color=this.parseColor(t.outline.color,r)),i.outline_edge_pct=0,i.outline_width&&i.outline_color){var s=i.outline_width+1;i.size[0]+=s,i.size[1]+=s,i.outline_edge_pct=s/Math.min(i.size[0],i.size[1])*2}i.size=[Math.min(i.size[0],256),Math.min(i.size[1],256)],i.placement=t.placement,i.placement_min_length_ratio=u.StyleParser.evalCachedProperty(t.placement_min_length_ratio,r),i.placement===z.SPACED&&t.placement_spacing&&(i.placement_spacing=u.StyleParser.evalCachedProperty(t.placement_spacing,r)),i.angle=u.StyleParser.evalProperty(t.angle,r)||0,i.z=t.z&&u.StyleParser.evalCachedDistanceProperty(t.z,r)||u.StyleParser.defaults.z,i.tile_edges=t.tile_edges,i.sampler=0,this.computeLayout(i,e,t,r,n);var l=t.text&&t.text.visible!==!1&&this.parseTextFeature(e,t.text,r,n);Array.isArray(l)&&(l=null,a.default({level:"warn",once:!0},"Layer '"+t.layers[t.layers.length-1]+"': cannot use boundary labels (e.g. 'text_source: { left: ..., right: ... }') for 'text' labels attached to 'points'; "+("provided 'text_source' value was '"+JSON.stringify(t.text.text_source)+"'"))),l&&(l.layout.parent=i,l.layout.priority=t.text.priority?Math.max(l.layout.priority,i.priority+.5):i.priority+.5,l.layout.move_into_tile=!1,x.default.addStyle(this.collision_group_text,n.key)),this.queueFeature({feature:e,draw:t,context:r,style:i,text_feature:l},n),x.default.addStyle(this.collision_group_points,n.key)}}},hasSprites:function(){return this.texture&&_.default.textures[this.texture]&&_.default.textures[this.texture].sprites},getSpriteInfo:function(e){var t=_.default.textures[this.texture].sprites[e]&&_.default.getSpriteInfo(this.texture,e);return e&&!t&&(this.texture_missing_sprites[e]||(a.default("debug","Style: in style '"+this.name+"', could not find sprite '"+e+"' for texture '"+this.texture+"'"),this.texture_missing_sprites[e]=!0)),t},parseSprite:function(e,t){var r=u.StyleParser.evalProperty(e.sprite,t),n=this.getSpriteInfo(r)||this.getSpriteInfo(e.sprite_default);return n},queueFeature:function(e,t){this.tile_data[t.key]&&this.queues[t.key]||this.startData(t),this.queues[t.key].push(e)},startData:function(e){return this.queues[e.key]=[],s.Style.startData.call(this,e)},endData:function(e){var t=this;if(e.canceled)return a.default("trace","Style "+this.name+": stop tile build because tile was canceled: "+e.key),Promise.resolve();var r=this.queues[e.key];delete this.queues[e.key];var n=[],o=[];return r.forEach(function(e){for(var r=e.style,i=e.feature,a=i.geometry,s=t.buildLabels(r.size,a,r),u=0;u<s.length;u++){var l=s[u],c={feature:i,draw:e.draw,context:e.context,style:r,label:l};if(o.push(c),e.text_feature){var f={feature:i,draw:e.text_feature.draw,context:e.context,text:e.text_feature.text,text_settings_key:e.text_feature.text_settings_key,layout:e.text_feature.layout,point_label:l,linked:c};n.push(f),e.draw.text.optional||(c.linked=f)}}}),Promise.all([x.default.collide(o,this.collision_group_points,e.key).then(function(e){e.forEach(function(e){t.feature_style=e.style,t.feature_style.label=e.label,s.Style.addFeature.call(t,e.feature,e.draw,e.context)})}),this.prepareTextLabels(e,this.collision_group_text,n).then(function(r){return t.collideAndRenderTextLabels(e,t.collision_group_text,r)})]).then(function(r){var n=i(r,2),o=n[1],a=o.labels,u=o.texts,l=o.texture;return a&&u&&a.forEach(function(e){var r=e.text_settings_key,n=u[r]&&u[r][e.text],i=t.feature_style;i.label=e.label,i.size=n.size.logical_size,i.angle=0,i.texcoords=n.align[e.label.align].texcoords,i.sampler=1,s.Style.addFeature.call(t,e.feature,e.draw,e.context)}),t.freeText(e),s.Style.endData.call(t,e).then(function(e){return l&&e&&(e.uniforms=e.uniforms||{},e.textures=e.textures||[],e.uniforms.u_label_texture=l,e.textures.push(l)),e})})},_preprocess:function(e){return e.color=u.StyleParser.createColorPropertyCache(e.color),e.outline&&(e.outline.color=u.StyleParser.createColorPropertyCache(e.outline.color),e.outline.width=u.StyleParser.createPropertyCache(e.outline.width,function(e){return Array.isArray(e)?e.map(parseFloat):parseFloat(e)})),e.z=u.StyleParser.createPropertyCache(e.z,u.StyleParser.parseUnits),e.size=u.StyleParser.createPropertyCache(e.size,function(e){return Array.isArray(e)?e.map(parseFloat):parseFloat(e)}),e.offset=u.StyleParser.createPropertyCache(e.offset,function(e){return Array.isArray(e)&&e.map(parseFloat)||0}),e.buffer=u.StyleParser.createPropertyCache(e.buffer,function(e){return(Array.isArray(e)?e:[e,e]).map(parseFloat)||0}),e.repeat_distance=u.StyleParser.createPropertyCache(e.repeat_distance,parseFloat),e.placement=z[e.placement&&e.placement.toUpperCase()],null==e.placement&&(e.placement=z.VERTEX),e.placement_spacing=null!=e.placement_spacing?e.placement_spacing:80,e.placement_spacing=u.StyleParser.createPropertyCache(e.placement_spacing,parseFloat),e.placement_min_length_ratio=null!=e.placement_min_length_ratio?e.placement_min_length_ratio:1,e.placement_min_length_ratio=u.StyleParser.createPropertyCache(e.placement_min_length_ratio,parseFloat),e.angle="number"==typeof e.angle?e.angle*Math.PI/180:e.angle||0,e.text=this.preprocessText(e.text),e.text&&(e.text.key=e.key,e.text.repeat_group=e.text.repeat_group||e.repeat_group,e.text.anchor=e.text.anchor||this.default_anchor,e.text.optional="boolean"==typeof e.text.optional?e.text.optional:!1,e.text.interactive=e.text.interactive||e.interactive),e},default_anchor:["bottom","top","right","left"],computeLayout:function(e,t,r,n,i){var o=e||{};o.id=t,o.units_per_pixel=i.units_per_pixel||1,o.collide=r.collide===!1?!1:!0,o.cull_from_tile=null!=r.cull_from_tile?r.cull_from_tile:!1,o.move_into_tile=!1,o.anchor=r.anchor,o.offset=u.StyleParser.evalCachedProperty(r.offset,n)||u.StyleParser.zeroPair,o.buffer=u.StyleParser.evalCachedProperty(r.buffer,n)||u.StyleParser.zeroPair,o.repeat_distance=u.StyleParser.evalCachedProperty(r.repeat_distance,n),o.repeat_distance&&(o.repeat_distance*=o.units_per_pixel,o.repeat_group="function"==typeof r.repeat_group?r.repeat_group(n):"string"==typeof r.repeat_group?r.repeat_group:r.key);var a=r.priority;return null!=a?"function"==typeof a&&(a=a(n)):a=-1>>>0,o.priority=a,o},buildTextLabels:function(e,t){for(var r=[],n=0;n<t.length;n++){var i=t[n],o=this.texts[e][i.text_settings_key][i.text],a=o.size.collision_size;i.label=new k.default(i.point_label.position,a,i.layout),r.push(i)}return r},buildLabels:function(e,t,r){var n=[];if("Point"===t.type)n.push(new k.default(t.coordinates,e,r));else if("MultiPoint"===t.type)for(var i=t.coordinates,o=0;o<i.length;++o){var a=i[o];n.push(new k.default(a,e,r))}else if("LineString"===t.type)for(var s=t.coordinates,u=T.default(s,e,r),l=0;l<u.length;++l)n.push(u[l]);else if("MultiLineString"===t.type)for(var c=t.coordinates,f=0;f<c.length;f++)for(var h=c[f],d=T.default(h,e,r),p=0;p<d.length;++p)n.push(d[p]);else if("Polygon"===t.type)if(r.placement===z.CENTROID){var _=g.default.centroid(t.coordinates);n.push(new k.default(_,e,r))}else for(var m=t.coordinates,v=0;v<m.length;v++)for(var y=T.default(m[v],e,r),b=0;b<y.length;++b)n.push(y[b]);else if("MultiPolygon"===t.type)if(r.placement===z.CENTROID){var x=g.default.multiCentroid(t.coordinates);n.push(new k.default(x,e,r))}else for(var w=t.coordinates,A=0;A<w.length;A++)for(var E=w[A],S=0;S<E.length;S++)for(var R=T.default(E[S],e,r),M=0;M<R.length;++M)n.push(R[M]);return n},makeVertexTemplate:function(e){var t=e.color||u.StyleParser.defaults.color;if(this.fillVertexTemplate("a_position",0,{size:2}),this.fillVertexTemplate("a_position",e.z||0,{size:1,offset:2}),this.fillVertexTemplate("a_position",this.scaleOrder(e.order),{size:1,offset:3}),this.fillVertexTemplate("a_shape",0,{size:4}),this.fillVertexTemplate("a_texcoord",0,{size:2}),this.fillVertexTemplate("a_offset",0,{size:2}),this.fillVertexTemplate("a_color",y.default.mult(t,255),{size:4}),this.defines.TANGRAM_SHADER_POINT){var r=e.outline_color||u.StyleParser.defaults.outline.color;this.fillVertexTemplate("a_outline_color",y.default.mult(r,255),{size:4}),this.fillVertexTemplate("a_outline_edge",e.outline_edge_pct||u.StyleParser.defaults.outline.width,{size:1})}return this.selection&&this.fillVertexTemplate("a_selection_color",y.default.mult(e.selection_color,255),{size:4}),this.vertex_template},buildQuad:function(e,t,r,n,i,o,a,s,u,l,c,f){d.buildQuadsForPoints(e,c,f,{texcoord_index:this.vertex_layout.index.a_texcoord,position_index:this.vertex_layout.index.a_position,shape_index:this.vertex_layout.index.a_shape,offset_index:this.vertex_layout.index.a_offset,offsets_index:this.vertex_layout.index.a_offsets,pre_angles_index:this.vertex_layout.index.a_pre_angles,angles_index:this.vertex_layout.index.a_angles,outline_edge_index:o?null:this.vertex_layout.index.a_outline_edge},{quad:t,quad_normalize:256,offset:a,offsets:s,pre_angles:i,angle:4096*r,angles:n,shape_w:o,curve:l,texcoord_scale:u,texcoord_normalize:I,pre_angles_normalize:L,angles_normalize:N,offsets_normalize:j})},build:function(e,t){var r=e.label;"curved"===r.type?this.buildArticulatedLabel(r,e,t):this.buildLabel(r,e,t)},buildLabel:function(e,t,r){var n=this.makeVertexTemplate(t),i=e.angle||t.angle,o=void 0,a=void 0;e.type?(o=t.size[e.type],a=t.texcoords[e.type]):(o=t.size,a=t.texcoords);var s=e.offset;this.buildQuad([e.position],o,i,null,null,t.sampler,s,null,a,!1,r,n)},buildArticulatedLabel:function(e,t,r){for(var n=this.makeVertexTemplate(t),i=e.angle,o=0;o<e.num_segments;o++){var a=t.size[e.type][o],s=t.texcoords_stroke[o],u=e.offset||[0,0],l=e.position,c=e.angles[o],f=e.offsets[o],h=e.pre_angles[o];this.buildQuad([l],a,i,c,h,t.sampler,u,f,s,!0,r,n)}for(var d=0;d<e.num_segments;d++){var p=t.size[e.type][d],_=t.texcoords[e.type][d],m=e.offset||[0,0],g=e.position,v=e.angles[d],y=e.offsets[d],b=e.pre_angles[d];this.buildQuad([g],p,i,v,b,t.sampler,m,y,_,!0,r,n)}},buildLines:function(e,t,r){this.build(t,r)},buildPoints:function(e,t,r){this.build(t,r)},buildPolygons:function(e,t,r){this.build(t,r)},makeMesh:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};return r=Object.assign({},r,{fade_in_time:this.fade_in_time}),s.Style.makeMesh.call(this,e,t,r)}})},{"../../builders/points":197,"../../geo":201,"../../gl/constants":202,"../../gl/texture":208,"../../gl/vertex_layout":213,"../../labels/collision":214,"../../labels/label_point":218,"../../labels/point_placement":220,"../../utils/debug_settings":255,"../../utils/log":259,"../../vector":270,"../../view":271,"../style":243,"../style_parser":245,"../text/text_labels":249}],241:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.shaderSrc_polygonsFragment=r.shaderSrc_polygonsVertex=r.Polygons=void 0;var i=e("../style"),o=e("../style_parser"),a=e("../../gl/constants"),s=n(a),u=e("../../gl/vertex_layout"),l=n(u),c=e("../../builders/polygons"),f=e("../../geo"),h=n(f),d='uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_tile_proxy_depth;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\n\nuniform mat4 u_model;\nuniform mat4 u_modelView;\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nattribute vec4 a_position;\nattribute vec4 a_color;\n\n// Optional normal attribute, otherwise default to up\n#ifdef TANGRAM_NORMAL_ATTRIBUTE\n    attribute vec3 a_normal;\n    #define TANGRAM_NORMAL a_normal\n#else\n    #define TANGRAM_NORMAL vec3(0., 0., 1.)\n#endif\n\n// Optional dynamic line extrusion\n#ifdef TANGRAM_EXTRUDE_LINES\n    // xy: extrusion direction in xy plane\n    // z:  half-width of line (amount to extrude)\n    // w:  scaling factor for interpolating width between zooms\n    attribute vec4 a_extrude;\n#endif\n\nvarying vec4 v_position;\nvarying vec3 v_normal;\nvarying vec4 v_color;\nvarying vec4 v_world_position;\n\n// Optional texture UVs\n#ifdef TANGRAM_TEXTURE_COORDS\n    attribute vec2 a_texcoord;\n    varying vec2 v_texcoord;\n#endif\n\n// Optional model position varying for tile coordinate zoom\n#ifdef TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING\n    varying vec4 v_modelpos_base_zoom;\n#endif\n\n#if defined(TANGRAM_LIGHTING_VERTEX)\n    varying vec4 v_lighting;\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvoid main() {\n    // Initialize globals\n    #pragma tangram: setup\n\n    // Texture UVs\n    #ifdef TANGRAM_TEXTURE_COORDS\n        v_texcoord = a_texcoord;\n        #ifdef TANGRAM_EXTRUDE_LINES\n            v_texcoord.y *= TANGRAM_V_SCALE_ADJUST;\n        #endif\n    #endif\n\n    // Pass model position to fragment shader\n    #ifdef TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING\n        v_modelpos_base_zoom = modelPositionBaseZoom();\n    #endif\n\n    // Position\n    vec4 position = vec4(a_position.xy, a_position.z / TANGRAM_HEIGHT_SCALE, 1.); // convert height back to meters\n\n    #ifdef TANGRAM_EXTRUDE_LINES\n        vec2 extrude = a_extrude.xy / 256.; // values have an 8-bit fraction\n        float width = a_extrude.z;\n        float dwdz = a_extrude.w;\n\n        // Adjust line width based on zoom level, to prevent proxied lines from being either too small or too big.\n        // "Flattens" the zoom between 1-2 to peg it to 1 (keeps lines from prematurely shrinking), then interpolate\n        // and clamp to 4 (keeps lines from becoming too small when far away).\n        float dz = clamp(u_map_position.z - u_tile_origin.z, 0., 4.);\n        dz += step(1., dz) * (1. - dz) + mix(0., 2., clamp((dz - 2.) / 2., 0., 1.));\n\n        // Interpolate between zoom levels\n        width += dwdz * dz;\n\n        // Scale pixel dimensions to be consistent in screen space\n        // Scale from style zoom units back to tile zoom\n        width *= exp2(-dz - (u_tile_origin.z - u_tile_origin.w));\n\n        // Modify line width before extrusion\n        #pragma tangram: width\n\n        position.xy += extrude * width;\n    #endif\n\n    // World coordinates for 3d procedural textures\n    v_world_position = wrapWorldPosition(u_model * position);\n\n    // Adjust for tile and view position\n    position = u_modelView * position;\n\n    // Modify position before camera projection\n    #pragma tangram: position\n\n    // Setup varyings\n    v_position = position;\n    v_normal = normalize(u_normalMatrix * TANGRAM_NORMAL);\n    v_color = a_color;\n\n    #if defined(TANGRAM_LIGHTING_VERTEX)\n        // Vertex lighting\n        vec3 normal = v_normal;\n\n        // Modify normal before lighting\n        #pragma tangram: normal\n\n        // Pass lighting intensity to fragment shader\n        v_lighting = calculateLighting(position.xyz - u_eye, normal, vec4(1.));\n    #endif\n\n    // Camera\n    cameraProjection(position);\n\n    // +1 is to keep all layers including proxies > 0\n    applyLayerOrder(a_position.w + u_tile_proxy_depth + 1., position);\n\n    gl_Position = position;\n}\n',p="uniform vec2 u_resolution;\nuniform float u_time;\nuniform vec3 u_map_position;\nuniform vec4 u_tile_origin;\nuniform float u_meters_per_pixel;\nuniform float u_device_pixel_ratio;\n\nuniform mat3 u_normalMatrix;\nuniform mat3 u_inverseNormalMatrix;\n\nvarying vec4 v_position;\nvarying vec3 v_normal;\nvarying vec4 v_color;\nvarying vec4 v_world_position;\n\n#define TANGRAM_NORMAL v_normal\n\n#ifdef TANGRAM_TEXTURE_COORDS\n    varying vec2 v_texcoord;\n#endif\n\n#ifdef TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING\n    varying vec4 v_modelpos_base_zoom;\n#endif\n\n#if defined(TANGRAM_LIGHTING_VERTEX)\n    varying vec4 v_lighting;\n#endif\n\n#pragma tangram: camera\n#pragma tangram: material\n#pragma tangram: lighting\n#pragma tangram: raster\n#pragma tangram: global\n\nvoid main (void) {\n    // Initialize globals\n    #pragma tangram: setup\n\n    vec4 color = v_color;\n    vec3 normal = TANGRAM_NORMAL;\n\n    // Apply raster to vertex color\n    #ifdef TANGRAM_RASTER_TEXTURE_COLOR\n        color *= sampleRaster(0); // multiplied to tint texture color\n    #endif\n\n    // Apply line texture\n    #ifdef TANGRAM_LINE_TEXTURE\n        vec2 _line_st = vec2(v_texcoord.x, fract(v_texcoord.y / u_texture_ratio));\n        vec4 _line_color = texture2D(u_texture, _line_st);\n\n        if (_line_color.a < TANGRAM_ALPHA_TEST) {\n            #ifdef TANGRAM_LINE_BACKGROUND_COLOR\n                color.rgb = TANGRAM_LINE_BACKGROUND_COLOR;\n            #elif !defined(TANGRAM_BLEND_OVERLAY) && !defined(TANGRAM_BLEND_INLAY)\n                discard; // use discard when alpha blending is unavailable\n            #else\n                color.a = 0.; // use alpha channel when blending is available\n            #endif\n        }\n        else {\n            color *= _line_color;\n        }\n    #endif\n\n    // First, get normal from raster tile (if applicable)\n    #ifdef TANGRAM_RASTER_TEXTURE_NORMAL\n        normal = normalize(sampleRaster(0).rgb * 2. - 1.);\n    #endif\n\n    // Second, alter normal with normal map texture (if applicable)\n    #if defined(TANGRAM_LIGHTING_FRAGMENT) && defined(TANGRAM_MATERIAL_NORMAL_TEXTURE)\n        calculateNormal(normal);\n    #endif\n\n    // Normal modification applied here for fragment lighting or no lighting,\n    // and in vertex shader for vertex lighting\n    #if !defined(TANGRAM_LIGHTING_VERTEX)\n        #pragma tangram: normal\n    #endif\n\n    // Color modification before lighting is applied\n    #pragma tangram: color\n\n    #if defined(TANGRAM_LIGHTING_FRAGMENT)\n        // Calculate per-fragment lighting\n        color = calculateLighting(v_position.xyz - u_eye, normal, color);\n    #elif defined(TANGRAM_LIGHTING_VERTEX)\n        // Apply lighting intensity interpolated from vertex shader\n        color *= v_lighting;\n    #endif\n\n    // Post-processing effects (modify color after lighting)\n    #pragma tangram: filter\n\n    gl_FragColor = color;\n}\n",_=r.Polygons=Object.create(i.Style);r.shaderSrc_polygonsVertex=d,r.shaderSrc_polygonsFragment=p,Object.assign(_,{name:"polygons",built_in:!0,vertex_shader_src:d,fragment_shader_src:p,init:function(){i.Style.init.apply(this,arguments);var e=[{name:"a_position",size:4,type:s.default.SHORT,normalized:!1},{name:"a_normal",size:3,type:s.default.BYTE,normalized:!0},{name:"a_color",size:4,type:s.default.UNSIGNED_BYTE,normalized:!0}];this.defines.TANGRAM_NORMAL_ATTRIBUTE=!0,this.defines.TANGRAM_LAYER_ORDER=!0,this.selection=!0,e.push({name:"a_selection_color",size:4,type:s.default.UNSIGNED_BYTE,normalized:!0}),this.texcoords&&(this.defines.TANGRAM_TEXTURE_COORDS=!0,e.push({name:"a_texcoord",size:2,type:s.default.UNSIGNED_SHORT,normalized:!0})),this.vertex_layout=new l.default(e)},_parseFeature:function(e,t,r){var n=this.feature_style;return n.color=this.parseColor(t.color,r),n.color?(n.z=t.z&&o.StyleParser.evalCachedDistanceProperty(t.z,r)||o.StyleParser.defaults.z,n.z*=h.default.height_scale,n.extrude=o.StyleParser.evalProperty(t.extrude,r),n.extrude&&(n.extrude===!0?(n.height=e.properties.height||o.StyleParser.defaults.height,n.min_height=e.properties.min_height||o.StyleParser.defaults.min_height):"number"==typeof n.extrude?(n.height=n.extrude,n.min_height=0):Array.isArray(n.extrude)&&(n.min_height=n.extrude[0],n.height=n.extrude[1]),n.height*=h.default.height_scale,n.min_height*=h.default.height_scale),n.tile_edges=t.tile_edges,n):null},_preprocess:function(e){return e.color=o.StyleParser.createColorPropertyCache(e.color),e.z=o.StyleParser.createPropertyCache(e.z,o.StyleParser.parseUnits),e},makeVertexTemplate:function(e){var t=0;return this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=e.z||0,this.vertex_template[t++]=this.scaleOrder(e.order),this.vertex_template[t++]=0,this.vertex_template[t++]=0,this.vertex_template[t++]=127,this.vertex_template[t++]=255*e.color[0],this.vertex_template[t++]=255*e.color[1],this.vertex_template[t++]=255*e.color[2],this.vertex_template[t++]=255*e.color[3],this.selection&&(this.vertex_template[t++]=255*e.selection_color[0],this.vertex_template[t++]=255*e.selection_color[1],this.vertex_template[t++]=255*e.selection_color[2],this.vertex_template[t++]=255*e.selection_color[3]),this.texcoords&&(this.vertex_template[t++]=0,this.vertex_template[t++]=0),this.vertex_template},buildPolygons:function(e,t,r,n){var i=this.makeVertexTemplate(t),o={texcoord_index:this.vertex_layout.index.a_texcoord,texcoord_normalize:65535,remove_tile_edges:!t.tile_edges,tile_edge_tolerance:h.default.tile_scale*n.tile.pad_scale*4,winding:n.winding};t.extrude&&t.height?c.buildExtrudedPolygons(e,t.z,t.height,t.min_height,r,i,this.vertex_layout.index.a_normal,127,o):c.buildPolygons(e,r,i,o)}})},{"../../builders/polygons":198,"../../geo":201,"../../gl/constants":202,"../../gl/vertex_layout":213,"../style":243,"../style_parser":245}],242:[function(e,t,r){"use strict";Object.defineProperty(r,"__esModule",{value:!0}),r.RasterStyle=void 0;var n=e("../style_parser"),i=e("../polygons/polygons"),o=r.RasterStyle=Object.create(i.Polygons);Object.assign(o,{name:"raster","super":i.Polygons,built_in:!0,init:function(){this.raster=this.raster||"color",this.super.init.apply(this,arguments),this.selection=!1},_preprocess:function(e){return e.color=e.color||n.StyleParser.defaults.color,this.super._preprocess.apply(this,arguments)}})},{"../polygons/polygons":241,"../style_parser":245}],243:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0}),r.Style=void 0;var i=function(){function e(e,t){var r=[],n=!0,i=!1,o=void 0;try{for(var a,s=e[Symbol.iterator]();!(n=(a=s.next()).done)&&(r.push(a.value),!t||r.length!==t);n=!0);}catch(u){i=!0,o=u}finally{try{!n&&s["return"]&&s["return"]()}finally{if(i)throw o}}return r}return function(t,r){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return e(t,r);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),o=e("./style_parser"),a=e("../selection"),s=n(a),u=e("../gl/shader_program"),l=n(u),c=e("../gl/vbo_mesh"),f=n(c),h=e("../gl/texture"),d=n(h),p=e("../material"),_=n(p),m=e("../light"),g=n(m),v=e("../sources/raster"),y=e("../utils/log"),b=n(y),x=e("../utils/merge"),w=n(x),k=e("../utils/thread"),A=n(k),T=e("../utils/worker_broker"),E=n(T),S="// Fragment shader for feature selection passes\n// Renders in silhouette according to selection (picking) color, or black if none defined\n\n#ifdef TANGRAM_FEATURE_SELECTION\n    varying vec4 v_selection_color;\n#endif\n\nvoid main (void) {\n    #ifdef TANGRAM_FEATURE_SELECTION\n        gl_FragColor = v_selection_color;\n    #else\n        gl_FragColor = vec4(0., 0., 0., 1.);\n    #endif\n}\n",R="// Uniforms defining raster textures and macros for accessing them\n\n#ifdef TANGRAM_FRAGMENT_SHADER\nuniform sampler2D u_rasters[TANGRAM_NUM_RASTER_SOURCES];    // raster tile texture samplers\nuniform vec2 u_raster_sizes[TANGRAM_NUM_RASTER_SOURCES];    // raster tile texture sizes (width/height in pixels)\nuniform vec3 u_raster_offsets[TANGRAM_NUM_RASTER_SOURCES];  // raster tile texture UV starting offset for tile\n\n// Note: the raster accessors below are #defines rather than functions to\n// avoid issues with constant integer expressions for array indices\n\n// Adjusts UVs in model space to account for raster tile texture overzooming\n// (applies scale and offset adjustments)\n#define adjustRasterUV(raster_index, uv) \\\n    ((uv) * u_raster_offsets[raster_index].z + u_raster_offsets[raster_index].xy)\n\n// Returns the UVs of the current model position for a raster sampler\n#define currentRasterUV(raster_index) \\\n    (adjustRasterUV(raster_index, v_modelpos_base_zoom.xy))\n\n// Returns pixel location in raster tile texture at current model position\n#define currentRasterPixel(raster_index) \\\n    (currentRasterUV(raster_index) * rasterPixelSize(raster_index))\n\n// Samples a raster tile texture for the current model position\n#define sampleRaster(raster_index) \\\n    (texture2D(u_rasters[raster_index], currentRasterUV(raster_index)))\n\n// Samples a raster tile texture for a given pixel\n#define sampleRasterAtPixel(raster_index, pixel) \\\n    (texture2D(u_rasters[raster_index], adjustRasterUV(raster_index, (pixel) / rasterPixelSize(raster_index))))\n\n// Returns size of raster sampler in pixels\n#define rasterPixelSize(raster_index) \\\n    (u_raster_sizes[raster_index])\n\n#endif\n",M=r.Style={init:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.generation,r=e.styles,n=e.sources,i=void 0===n?{}:n,a=e.introspection;this.generation=t,this.styles=r,this.sources=i,this.defines=this.hasOwnProperty("defines")&&this.defines||{},this.shaders=this.hasOwnProperty("shaders")&&this.shaders||{},this.introspection=a||!1,this.selection=this.selection||this.introspection||!1,this.compile_setup=!1,this.program=null,this.selection_program=null,this.feature_style={},this.vertex_template=[],this.tile_data={},this.main_thread_target=["Style",this.name,this.generation].join("/"),A.default.is_main&&E.default.addTarget(this.main_thread_target,this),this.defines.TANGRAM_WORLD_POSITION_WRAP=1e5,this.blend=this.blend||"opaque",this.defines["TANGRAM_BLEND_"+this.blend.toUpperCase()]=!0,null==this.blend_order&&(this.blend_order=-1),this.removeShaderBlock("setup"),this.material instanceof _.default||(_.default.isValid(this.material)||(this.material=o.StyleParser.defaults.material),this.material=new _.default(this.material)),this.material.inject(this),g.default.setMode(this.lighting,this),this.setupRasters(),this.initialized=!0},destroy:function(){this.program&&(this.program.destroy(),this.program=null),this.selection_program&&(this.selection_program.destroy(),this.selection_program=null),this.gl=null,this.initialized=!1},reset:function(){},baseStyle:function(){return this.base||this.name},fillVertexTemplate:function(e,t,r){var n=r.size,i=r.offset;i=void 0===i?0:i;var o=this.vertex_layout.index[e];if(void 0===o)return void b.default("warn","Style: in style '"+this.name+"', no index found in vertex layout for attribute '"+e+"'");for(var a=0;n>a;++a){var s=t.length>a?t[a]:t;this.vertex_template[o+a+i]=s}},startData:function(e){return this.tile_data[e.key]={vertex_data:null,uniforms:{},textures:[]},this.tile_data[e.key]},endData:function(e){var t=this.tile_data[e.key];return this.tile_data[e.key]=null,t&&t.vertex_data&&t.vertex_data.vertex_count>0?(t.vertex_data.end(),t.vertex_elements=t.vertex_data.element_buffer,t.vertex_data=t.vertex_data.vertex_buffer,this.buildRasterTextures(e,t).then(function(){return t})):Promise.resolve(null)},hasDataForTile:function(e){return null!=this.tile_data[e]},addFeature:function(e,t,r){var n=r.tile;if(n.generation===this.generation){this.tile_data[n.key]||this.startData(n);var i=this.parseFeature(e,t,r);i&&(this.tile_data[n.key].vertex_data||(this.tile_data[n.key].vertex_data=this.vertex_layout.createVertexData()),this.buildGeometry(e.geometry,i,this.tile_data[n.key].vertex_data,r))}},buildGeometry:function(e,t,r,n){"Polygon"===e.type?this.buildPolygons([e.coordinates],t,r,n):"MultiPolygon"===e.type?this.buildPolygons(e.coordinates,t,r,n):"LineString"===e.type?this.buildLines([e.coordinates],t,r,n):"MultiLineString"===e.type?this.buildLines(e.coordinates,t,r,n):"Point"===e.type?this.buildPoints([e.coordinates],t,r,n):"MultiPoint"===e.type&&this.buildPoints(e.coordinates,t,r,n)},parseFeature:function(e,t,r){try{var n=this.feature_style;if(t=this.preprocess(t),!t)return;if(n.order=this.parseOrder(t.order,r),null==n.order&&"overlay"!==this.blend){var i="Layer '"+t.layers.join(", ")+"', draw group '"+t.group+"': ";return i+="'order' parameter is required unless blend mode is 'overlay'",null!=t.order&&(i+="; 'order' was set to a dynamic value (e.g. string tied to feature property, ",i+="or JS function), but evaluated to null for one or more features"),void b.default({level:"warn",once:!0},i)}var a=!1;return n.interactive=this.introspection||t.interactive,this.selection&&(a=o.StyleParser.evalProperty(n.interactive,r)),n.selection_color=a?s.default.makeColor(e,r.tile,r):s.default.defaultColor,n=this._parseFeature(e,t,r)}catch(u){b.default("error","Style.parseFeature: style parsing error",e,n,u)}},_parseFeature:function(){return this.feature_style},preprocess:function(e){if(!e.preprocessed){if(this.draw&&w.default(e,this.draw),e=this._preprocess(e),!e)return;e.preprocessed=!0}return e},_preprocess:function(e){return e},parseOrder:function(e,t){return"number"!=typeof e?o.StyleParser.calculateOrder(e,t):e},scaleOrder:function(e){return 2*e},parseColor:function(e,t){return e?o.StyleParser.evalCachedColorProperty(e,t):this.shaders.blocks.color||this.shaders.blocks.filter?o.StyleParser.defaults.color:void 0},buildPolygons:function(){},buildLines:function(){},buildPoints:function(){},setGL:function(e){this.gl=e,this.max_texture_size=d.default.getMaxTextureSize(this.gl)},makeMesh:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};return new f.default(this.gl,e,t,this.vertex_layout,r)},render:function(e){return e.render()},getProgram:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"program";this.compileSetup();var t=this[e];if(t&&!t.error)return t.compiled||(b.default("debug","Compiling style '"+this.name+"', program key '"+e+"'"),t.compile()),t},compileSetup:function(){if(!this.compile_setup){if(!this.gl)throw new Error("style.compile(): skipping for "+this.name+" because no GL context");var e=this.buildDefineList();if(this.selection){var t=Object.assign({},e);t.TANGRAM_FEATURE_SELECTION=!0}var r=this.shaders&&this.shaders.blocks,n=this.shaders&&this.shaders.block_scopes,i=Object.assign({},this.shaders&&this.shaders.uniforms);
+for(var o in i)null==i[o]&&b.default({level:"warn",once:!0},"Style '"+this.name+"' has invalid uniform '"+o+"': uniform values must be non-null");var a=this.shaders&&this.shaders.extensions;"string"==typeof a&&(a=[a]),this.program=new l.default(this.gl,this.vertex_shader_src,this.fragment_shader_src,{name:this.name,defines:e,uniforms:i,blocks:r,block_scopes:n,extensions:a}),this.selection_program=this.selection?new l.default(this.gl,this.vertex_shader_src,S,{name:this.name+" (selection)",defines:t,uniforms:i,blocks:r,block_scopes:n,extensions:a}):null,this.compile_setup=!0}},addShaderBlock:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null;this.shaders.blocks=this.shaders.blocks||{},this.shaders.blocks[e]=this.shaders.blocks[e]||[],this.shaders.blocks[e].push(t),this.shaders.block_scopes=this.shaders.block_scopes||{},this.shaders.block_scopes[e]=this.shaders.block_scopes[e]||[],this.shaders.block_scopes[e].push(r)},removeShaderBlock:function(e){this.shaders.blocks&&(this.shaders.blocks[e]=null)},replaceShaderBlock:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null;this.removeShaderBlock(e),this.addShaderBlock(e,t,r)},buildDefineList:function(){var e={};if(null!=this.defines)for(var t in this.defines)e[t]=this.defines[t];if(null!=this.shaders&&null!=this.shaders.defines)for(t in this.shaders.defines)e[t]=this.shaders.defines[t];return e},hasRasters:function(){return["color","normal","custom"].indexOf(this.raster)>-1},setupRasters:function(){var e=this;if(this.hasRasters()){"color"===this.raster?this.defines.TANGRAM_RASTER_TEXTURE_COLOR=!0:"normal"===this.raster&&(this.defines.TANGRAM_RASTER_TEXTURE_NORMAL=!0);var t=Object.keys(this.sources).filter(function(t){return e.sources[t]instanceof v.RasterTileSource}).length;this.defines.TANGRAM_NUM_RASTER_SOURCES="int("+t+")",t>0&&(this.defines.TANGRAM_MODEL_POSITION_BASE_ZOOM_VARYING=!0,this.replaceShaderBlock("raster",R,"Raster"))}},buildRasterTextures:function(e,t){var r=this;if(!this.hasRasters())return Promise.resolve(t);var n={},o={};return e.rasters.map(function(e){return r.sources[e]}).filter(function(e){return e}).forEach(function(t,r){if(t instanceof v.RasterTileSource){var i=t.tileTexture(e);n[i.url]=i,o[i.url]=r}}),0===Object.keys(n).length?Promise.resolve(t):E.default.postMessage(this.main_thread_target+".loadTextures",n).then(function(r){if(!r||r.length<1)return t;t.uniforms=t.uniforms||{},t.textures=t.textures||[];var a=t.uniforms.u_rasters=[],s=t.uniforms.u_raster_sizes=[],u=t.uniforms.u_raster_offsets=[];return r.forEach(function(r){var l=i(r,3),c=l[0],f=l[1],h=l[2],d=o[c],p=n[c].coords;if(a[d]=c,t.textures.push(c),s[d]=[f,h],e.coords.z>p.z){var _=e.coords.z-p.z,m=Math.pow(2,_);u[d]=[e.coords.x%m/m,(m-1-e.coords.y%m)/m,1/m]}else u[d]=[0,0,1]}),t})},loadTextures:function(e){return d.default.createFromObject(this.gl,e).then(function(){return Promise.all(Object.keys(e).map(function(e){return d.default.textures[e]&&d.default.textures[e].load()}).filter(function(e){return e}))}).then(function(e){return e.forEach(function(e){return e.retain()}),e.map(function(e){return[e.name,e.width,e.height]})})},setup:function(){this.setUniforms(),this.material.setupProgram(l.default.current)},setUniforms:function(){var e=l.default.current;e&&e.setUniforms(this.shaders&&this.shaders.uniforms,!0)},render_states:{opaque:{depth_test:!0,depth_write:!0},add:{depth_test:!0,depth_write:!1},multiply:{depth_test:!0,depth_write:!1},inlay:{depth_test:!0,depth_write:!1},overlay:{depth_test:!1,depth_write:!1}},default_blend_orders:{opaque:0,add:1,multiply:2,inlay:3,overlay:4},blendOrderSort:function(e,t){return"opaque"===e.blend||"opaque"===t.blend?"opaque"===e.blend&&"opaque"===t.blend?e.name<t.name?-1:1:"opaque"===e.blend?-1:1:e.blend_order<t.blend_order?-1:e.blend_order>t.blend_order?1:M.default_blend_orders[e.blend]<M.default_blend_orders[t.blend]?-1:M.default_blend_orders[e.blend]>M.default_blend_orders[t.blend]?1:e.name<t.name?-1:1}}},{"../gl/shader_program":207,"../gl/texture":208,"../gl/vbo_mesh":210,"../light":223,"../material":224,"../selection":230,"../sources/raster":234,"../utils/log":259,"../utils/merge":261,"../utils/thread":265,"../utils/worker_broker":269,"./style_parser":245}],244:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function o(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0}),r.StyleManager=void 0;{var a=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),s=e("../gl/shader_program"),u=n(s),l=e("../utils/merge"),c=n(l),f=e("../geo"),h=n(f),d=e("../utils/log"),p=n(d),_=e("./polygons/polygons"),m=e("./lines/lines"),g=e("./points/points"),v=e("./text/text"),y=e("./raster/raster"),b="#ifdef TANGRAM_VERTEX_SHADER\n\n// Vertex position in model space: [0, 1] range over the local tile\n// Note positions can be outside that range due to unclipped geometry, geometry higher than a unit cube, etc.\nvec4 modelPosition() {\n    return\n        vec4(\n            a_position.xyz / TANGRAM_TILE_SCALE         // scale coords to ~0-1 range\n            * exp2(u_tile_origin.z - u_tile_origin.w),  // adjust for tile overzooming\n        1.)\n        + vec4(0., 1., 0., 0.);\n        // NB: additional offset to account for unusual Tangram JS y coords,\n        // should be refactored to remove\n}\n\n// Position in model space as above, but according to tile coordinate (as opposed to style) zoom\n// e.g. unadjusted for tile overzooming\nvec4 modelPositionBaseZoom() {\n    return\n        vec4(\n            a_position.xyz / TANGRAM_TILE_SCALE,    // scale coords to ~0-1 range\n        1.)\n        + vec4(0., 1., 0., 0.); // see note on offset above\n}\n\n#endif\n\n// Vertex position in world coordinates, useful for 3d procedural textures, etc.\nvec4 worldPosition() {\n    return v_world_position;\n}\n\n// Optionally wrap world coordinates (allows more precision at higher zooms)\n// e.g. at wrap 1000, the world space will wrap every 1000 meters\n#ifdef TANGRAM_VERTEX_SHADER\n\nvec4 wrapWorldPosition(vec4 world_position) {\n    #if defined(TANGRAM_WORLD_POSITION_WRAP)\n    vec2 anchor = u_tile_origin.xy - mod(u_tile_origin.xy, TANGRAM_WORLD_POSITION_WRAP);\n        world_position.xy -= anchor;\n    #endif\n    return world_position;\n}\n\n#endif\n\n// Normal in world space\n#if defined(TANGRAM_VERTEX_SHADER)\n\nvec3 worldNormal() {\n    return TANGRAM_NORMAL;\n}\n\n#elif defined(TANGRAM_FRAGMENT_SHADER)\n\nvec3 worldNormal() {\n    return u_inverseNormalMatrix * TANGRAM_NORMAL;\n}\n\n#endif\n",x="// Apply layer ordering to avoid z-fighting\nvoid applyLayerOrder (float layer, inout vec4 position) {\n    position.z -= layer * TANGRAM_LAYER_DELTA * position.w;\n}\n",w="// Vertex attribute + varying for feature selection\n#if defined(TANGRAM_FEATURE_SELECTION) && defined(TANGRAM_VERTEX_SHADER)\n    attribute vec4 a_selection_color;\n    varying vec4 v_selection_color;\n#endif\n",k="// Selection pass-specific rendering\n#if defined(TANGRAM_FEATURE_SELECTION) && defined(TANGRAM_VERTEX_SHADER)\n    if (a_selection_color.rgb == vec3(0.)) {\n        // Discard by forcing invalid triangle if we're in the feature\n        // selection pass but have no selection info\n        // TODO: in some cases we may actually want non-selectable features to occlude selectable ones?\n        gl_Position = vec4(0., 0., 0., 1.);\n        return;\n    }\n    v_selection_color = a_selection_color;\n#endif\n";r.StyleManager=function(){function e(){o(this,e),this.styles={},this.base_styles={},this.register(Object.create(_.Polygons)),this.register(Object.create(m.Lines)),this.register(Object.create(g.Points)),this.register(Object.create(v.TextStyle)),this.register(Object.create(y.RasterStyle))}return a(e,[{key:"init",value:function(){u.default.removeBlock("global"),u.default.removeBlock("setup"),u.default.addBlock("global",b),u.default.addBlock("global",x),u.default.addBlock("global",w),u.default.replaceBlock("setup",k),u.default.defines.TANGRAM_EPSILON=1e-5,u.default.defines.TANGRAM_LAYER_DELTA=1/16384,u.default.defines.TANGRAM_TILE_SCALE="vec3("+h.default.tile_scale+"., "+h.default.tile_scale+"., u_meters_per_pixel * "+h.default.tile_size+".)",u.default.defines.TANGRAM_HEIGHT_SCALE=h.default.height_scale}},{key:"destroy",value:function(e){var t=this;Object.keys(this.styles).forEach(function(r){var n=t.styles[r];n.gl===e&&(p.default("trace","StyleManager.destroy: destroying render style "+n.name),n.base&&t.remove(n.name),n.destroy())})}},{key:"register",value:function(e){this.styles[e.name]=e,this.base_styles[e.name]=e}},{key:"remove",value:function(e){delete this.styles[e]}},{key:"mix",value:function(e,t){if(e.mixed)return e;e.mixed={};var r=[];if(e.mix){if(Array.isArray(e.mix)){var n;(n=r).push.apply(n,i(e.mix))}else r.push(e.mix);r=r.map(function(e){return t[e]}).filter(function(t){return t&&t!==e}),r.forEach(function(t){return e.mixed[t.name]=!0})}r.push(e),e.animated=r.some(function(e){return e&&e.animated}),e.texcoords=r.some(function(e){return e&&e.texcoords}),e.base=r.map(function(e){return e.base}).filter(function(e){return e}).pop(),e.lighting=r.map(function(e){return e.lighting}).filter(function(e){return null!=e}).pop(),e.texture=r.map(function(e){return e.texture}).filter(function(e){return e}).pop(),e.raster=r.map(function(e){return e.raster}).filter(function(e){return null!=e}).pop(),e.dash=r.map(function(e){return e.dash}).filter(function(e){return null!=e}).pop(),e.dash_background_color=r.map(function(e){return e.dash_background_color}).filter(function(e){return null!=e}).pop(),r.some(function(e){return e.hasOwnProperty("blend")&&e.blend})&&(e.blend=r.map(function(e){return e.hasOwnProperty("blend")&&e.blend}).filter(function(e){return e}).pop()),e.blend_order=r.map(function(e){return e.blend_order}).filter(function(e){return null!=e}).pop(),e.defines=Object.assign.apply(Object,[{}].concat(i(r.map(function(e){return e.defines}).filter(function(e){return e})))),e.material=Object.assign.apply(Object,[{}].concat(i(r.map(function(e){return e.material}).filter(function(e){return e}))));var o=r.map(function(e){return e.draw}).filter(function(e){return e});return o.length>0&&(e.draw=c.default.apply(void 0,[{}].concat(i(o)))),this.mixShaders(e,t,r),e}},{key:"mixShaders",value:function(e,t,r){var n={},o=r.map(function(e){return e.shaders}).filter(function(e){return e});if(n.defines=Object.assign.apply(Object,[{}].concat(i(o.map(function(e){return e.defines}).filter(function(e){return e})))),n.uniforms={},n._uniforms=e.shaders&&e.shaders.uniforms||{},n._uniform_scopes={},r.filter(function(e){return e.shaders&&e.shaders.uniforms}).forEach(function(e){var r=function(r){n._uniform_scopes[r]=e.name,Object.defineProperty(n.uniforms,r,{enumerable:!0,configurable:!0,get:function(){return void 0!==n._uniforms[r]?n._uniforms[r]:t[n._uniform_scopes[r]].shaders.uniforms!==n.uniforms?t[n._uniform_scopes[r]].shaders.uniforms[r]:void 0},set:function(e){n._uniforms[r]=e}})};for(var i in e.shaders.uniforms)r(i)}),n.extensions=Object.keys(o.map(function(e){return e.extensions}).filter(function(e){return e}).reduce(function(e,t){return"string"==typeof t?e[t]=!0:t.forEach(function(t){return e[t]=!0}),e},{})||{}),e.shaders&&e.shaders.blocks){e.shaders.block_scopes=e.shaders.block_scopes||{};for(var a in e.shaders.blocks){var s=e.shaders.blocks[a];if(e.shaders.block_scopes[a]=e.shaders.block_scopes[a]||[],Array.isArray(s)){var u;(u=e.shaders.block_scopes[a]).push.apply(u,i(s.map(function(){return e.name})))}else e.shaders.block_scopes[a].push(e.name)}}var l={};return o.forEach(function(e){if(e.blocks){n.blocks=n.blocks||{},n.block_scopes=n.block_scopes||{};var t={};for(var r in e.blocks){var i=e.blocks[r],o=e.block_scopes[r];n.blocks[r]=n.blocks[r]||[],n.block_scopes[r]=n.block_scopes[r]||[],i=Array.isArray(i)?i:[i],o=Array.isArray(o)?o:[o];for(var a=0;a<i.length;a++)l[o[a]]||(t[o[a]]=!0,n.blocks[r].push(i[a]),n.block_scopes[r].push(o[a]))}Object.assign(l,t)}}),Object.assign(e.mixed,l),e.shaders=n,e}},{key:"create",value:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{},n=c.default({},t);return n.name=e,n=this.mix(n,r),n.base&&this.base_styles[n.base]?this.styles[e]=n=Object.assign(Object.create(this.base_styles[n.base]),n):n.base=null,n}},{key:"build",value:function(e){var t=this,r=Object.keys(e).sort(function(r,n){return t.inheritanceDepth(r,e)-t.inheritanceDepth(n,e)});for(var n in this.styles)this.base_styles[n]?this.styles[n].reset():delete this.styles[n];var i={};return 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s=this.context,u=_.default.device_pixel_ratio*a;n&&i>0&&(s.strokeStyle=n,s.lineWidth=i*u),s.fillStyle=r,s.font=t,s.miterLimit=2}},{key:"textSizes",value:function(t){var r=this,n=void 0;return y.default.loadFonts().then(function(){for(var i in t){e.initTextCache(i);var o=t[i],a=!0;for(var c in o){var f=o[c],h=f.text_settings;if(a&&(r.setFont(h),n=_.default.device_pixel_ratio*h.supersample,a=!1),h.can_articulate){for(var d=l(c),p=c.split(" "),m=!1,g=!1,v=!1,y=0;y<p.length;y++)if(u(p[y])){if(g){v=!0;break}m=!0}else{if(m){v=!0;break}g=!0}var b=m&&!g&&!v,x=s(c);if(f.isRTL=b,f.no_curving=v||x,f.vertical_buffer=r.vertical_text_buffer,b&&d.reverse(),f.segments=d,f.size=[],!f.no_curving)for(var w=0;w<d.length;w++)f.size.push(r.textSize(i,d[w],h).size);f.total_size=r.textSize(i,c,h).size}else f.size=r.textSize(i,c,h).size}}return t})}},{key:"textSize",value:function(t,r,n){var i=n.transform,o=n.text_wrap,a=n.max_lines,s=n.stroke_width,u=void 0===s?0:s,l=n.supersample;if(e.text_cache[t][r])return 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b=_.default.device_pixel_ratio*p,w=b*(this.horizontal_text_buffer+f),k=b*this.vertical_text_buffer,A=r.collision_size,T=2;this.context.strokeStyle="blue",this.context.lineWidth=T,this.context.strokeRect(a+w,s+k,b*A[0],b*A[1]),"curved"===i&&this.context.strokeRect(a+r.texture_size[0]+w,s+k,b*A[0],b*A[1]),this.context.restore()}if(x.default.draw_label_texture_boxes){this.context.save();var E=r.texture_size,S=2;this.context.strokeStyle="green",this.context.lineWidth=S,this.context.strokeRect(a+S,s+S,E[0]-2*S,E[1]-2*S),"curved"===i&&this.context.strokeRect(a+S+r.texture_size[0],s+S,E[0]-2*S,E[1]-2*S),this.context.restore()}}},{key:"drawTextLine",value:function(e,t,r,n,i){var o=c(t,2),a=o[0],s=o[1],u=n.stroke,l=n.stroke_width,f=void 0===l?0:l,h=n.transform,d=n.align,p=n.supersample,m=_.default.device_pixel_ratio*p;d=d||"center";var g=this.vertical_text_buffer*m,v=r.texture_size,y=r.line_height,b=m*(f+this.horizontal_text_buffer),x=this.applyTextTransform(e.text,h),w=void 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x=d.size[y].texture_size,w=2*x[0];w>i&&(i=w),u+x[1]<r?(p=[s,u],u+=x[1],u>l&&(l=u)):(s+=i,i=0,u=0,p=[s,u]),e.texcoord_cache[n][c][b]={texture_position:p}}}}}else{var k=d.size.texture_size;k[0]>i&&(i=k[0]);for(var A in d.align)u+k[1]<r?(d.align[A].texture_position=[s,u],u+=k[1],u>l&&(l=u)):(s+=i,i=0,u=0,d.align[A].texture_position=[s,u])}}}return[s+i,l]}},{key:"applyTextTransform",value:function(e,t){return"capitalize"===t?e.replace(/\w\S*/g,function(e){return e.charAt(0).toUpperCase()+e.substr(1)}):"uppercase"===t?e.toUpperCase():"lowercase"===t?e.toLowerCase():e}}],[{key:"fontPixelSize",value:function(t){if(null!=t){t="string"==typeof t?t:String(t);var r=t.match(e.font_size_re)||[],n=c(r,3),i=n[1],o=n[2];return o=o||"px","em"===o?i*=16:"pt"===o?i/=.75:"%"===o&&(i/=6.25),i=parseFloat(i),i*=_.default.device_pixel_ratio}}},{key:"clearTexcoordCache",value:function(t){delete e.texcoord_cache[t]}},{key:"initTextCache",value:function(t){e.text_cache[t]=e.text_cache[t]||{}}},{key:"pruneTextCache",value:function(){e.text_cache_count>e.text_cache_count_max&&(e.text_cache={},e.text_cache_count=0,d.default("debug","CanvasText: pruning text cache"))}}]),e}();r.default=k,k.font_size_re=/((?:[0-9]*\.)?[0-9]+)\s*(px|pt|em|%)?/,k.text_cache={},k.text_cache_count=0,k.text_cache_count_max=5e3,k.cache_stats={hits:0,misses:0},k.texcoord_cache={};var A={Arabic:"؀-ۿ",Bengali:"ঀ-৿",Burmese:"က-႟",Devanagari:"ऀ-ॿ",Khmer:"ក-៿",Gujarati:"઀-૿",Gurmukhi:"਀-੿",Kannada:"ಀ-೿",Lao:"຀-໿",Mongolian:"᠀-᢯",Oriya:"଀-୿",Tamil:"஀-௿",Telugu:"ఀ-౿",Tibetan:"ༀ-࿿"},T="[";for(var E in A)T+=A[E];T+="]";var S=new RegExp(T),R=new RegExp("^[\x00-@[-`{-¿×÷ʹ-˿ -⯿‐-\u2029‬ -⯿֑-߿‏‫‮יִ-﷽ﹰ-ﻼ]+$"),M=function(){function e(t){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:1/0,n=arguments.length>2&&void 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e(o,n,r),u=s.createLine(i),l=0;l<a.length;l++){for(var c=a[l].split("\n"),f=0===l?!0:!1,h=0;h<c.length&&u;h++){var d=c[h];if(d){var p=f?d:" "+d;if(r&&l>0&&u.exceedsTextwrap(p)){if(u=s.advance(u,i),!u)break;u.append(d),f=!0}else u.append(p);h<c.length-1&&(u=s.advance(u,i),f=!0)}}l===a.length-1&&s.finish(u)}return s}}]),e}();M.ellipsis="...";var O=function(){function e(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:0,r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:0;i(this,e),this.chars=0,this.text="",this.height=Math.ceil(t),this.text_wrap=r}return f(e,[{key:"append",value:function(e){this.chars+=e.length,this.text+=e}},{key:"exceedsTextwrap",value:function(e){return e.length+this.chars>this.text_wrap}}]),e}()},{"../../gl/texture":208,"../../utils/debug_settings":255,"../../utils/log":259,"../../utils/utils":267,"./font_manager":247}],247:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},o=e("../../utils/log"),a=n(o),s=e("../../utils/utils"),u=n(s),l=e("fontfaceobserver"),c=n(l),f={fonts_loaded:Promise.resolve(),last_loaded:null,loadFonts:function(e){var t=this,r=JSON.stringify(e)===this.last_loaded;return e&&!r&&!function(){var r=[],n=function(n){Array.isArray(e[n])?e[n].forEach(function(e){return r.push(t.loadFontFace(n,e))}):r.push(t.loadFontFace(n,e[n]))};for(var i in e)n(i);t.last_loaded=JSON.stringify(e),t.fonts_loaded=Promise.all(r.filter(function(e){return e}))}(),this.fonts_loaded},loadFontFace:function(e,t){if(null!=t&&("object"===("undefined"==typeof t?"undefined":i(t))||"external"===t)){var r={family:e},n=Promise.resolve();"object"===("undefined"==typeof t?"undefined":i(t))&&(Object.assign(r,t),"string"==typeof t.url&&(n=this.injectFontFace(r)));var o=new c.default(e,r);return n.then(function(){return o.load()}).then(function(){a.default("debug","Font face '"+e+"' is available",r)},function(){a.default("debug","Font face '"+e+"' is NOT available",r)})}},injectFontFace:function(e){var t=this,r=e.family,n=e.url,i=e.weight,o=e.style;void 0===this.supports_native_font_loading&&(this.supports_native_font_loading=void 0!==window.FontFace);var s=Promise.resolve(n);return"blob:"===n.slice(0,5)&&(s=u.default.io(n,6e4,"arraybuffer").then(function(e){var r=new Uint8Array(e);if(t.supports_native_font_loading)return r;for(var n="",i=0;i<r.length;i++)n+=String.fromCharCode(r[i]);return"data:font/opentype;base64,"+btoa(n)})),s.then(function(e){if(t.supports_native_font_loading){var n=void 0;"string"==typeof e?n=new FontFace(r,"url("+encodeURI(e)+")",{weight:i,style:o}):e instanceof Uint8Array&&(n=new FontFace(r,e,{weight:i,style:o})),document.fonts.add(n),a.default("trace","Adding FontFace to document.fonts:",n)}else{var s="\n                    @font-face {\n                        font-family: '"+r+"';\n                        font-weight: "+(i||"normal")+";\n                        font-style: "+(o||"normal")+";\n                        src: url("+encodeURI(e)+");\n                    }\n                ",u=document.createElement("style");
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0!==arguments[0]?arguments[0]:{},t=[{name:"a_angles",size:4,type:_.default.SHORT,normalized:!1},{name:"a_offsets",size:4,type:_.default.UNSIGNED_SHORT,normalized:!1},{name:"a_pre_angles",size:4,type:_.default.BYTE,normalized:!1}];this.super.init.call(this,e,t),this.defines.TANGRAM_TEXTURE_POINT=!0,this.defines.TANGRAM_SHADER_POINT=!1,this.defines.TANGRAM_CURVED_LABEL=!0,this.defines.TANGRAM_MULTI_SAMPLER=!1,this.defines.TANGRAM_UNMULTIPLY_ALPHA=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT=!0,this.defines.TANGRAM_FADE_ON_ZOOM_OUT_RATE=2,this.defines.TANGRAM_FADE_ON_ZOOM_IN=!0,this.defines.TANGRAM_FADE_ON_ZOOM_IN_RATE=2,this.reset()},makeVertexTemplate:function(e){return this.super.makeVertexTemplate.call(this,e),this.fillVertexTemplate("a_pre_angles",0,{size:4}),this.fillVertexTemplate("a_offsets",0,{size:4}),this.fillVertexTemplate("a_angles",0,{size:4}),this.vertex_template},reset:function(){this.queues={},this.resetText()},addFeature:function(e,t,r){var n=this,i=r.tile;if(i.generation===this.generation&&(t=this.preprocess(t))){var o=e.geometry.type;t.can_articulate="LineString"===o||"MultiLineString"===o,t.supersample_text="LineString"===o||"MultiLineString"===o;var a=this.parseTextFeature(e,t,r,i);a&&(a instanceof Array?a.forEach(function(t){t.feature=e,t.context=r,t.layout.vertex=!1,n.queueFeature(t,i)}):(a.feature=e,a.context=r,a.layout.vertex=!1,this.queueFeature(a,i)),l.default.addStyle(this.name,i.key))}},startData:function(e){return this.queues[e.key]=[],a.Style.startData.call(this,e)},endData:function(e){var t=this,r=this.queues[e.key];return delete this.queues[e.key],this.prepareTextLabels(e,this.name,r).then(function(r){return t.collideAndRenderTextLabels(e,t.name,r)}).then(function(r){var n=r.labels,i=r.texts,o=r.texture;return i&&(t.texts[e.key]=i,n.forEach(function(r){var n=r.text_settings_key,i=t.texts[e.key][n]&&t.texts[e.key][n][r.text],o=t.feature_style;o.label=r.label,i.text_settings.can_articulate?(o.size={},o.texcoords={},"straight"===r.label.type?(o.size.straight=i.total_size.logical_size,o.texcoords.straight=i.texcoords.straight):(o.size.curved=i.size.map(function(e){return e.logical_size}),o.texcoords_stroke=i.texcoords_stroke,o.texcoords.curved=i.texcoords.curved)):(o.size=i.size.logical_size,o.texcoords=i.align[r.label.align].texcoords),a.Style.addFeature.call(t,r.feature,r.draw,r.context)})),t.freeText(e),a.Style.endData.call(t,e).then(function(e){return o&&e?(e.uniforms.u_texture=o,e.textures.push(o),e):void 0})})},_preprocess:function(e){return this.preprocessText(e)},buildTextLabels:function(e,t){for(var r=[],n=0;n<t.length;n++){var i=t[n],o=this.texts[e][i.text_settings_key][i.text],a=void 0;if(i.layout.vertical_buffer=o.vertical_buffer,o.text_settings.can_articulate){var s=o.size.map(function(e){return e.collision_size});i.layout.no_curving=o.no_curving,a=this.buildLabels(s,i.feature.geometry,i.layout,o.total_size.collision_size)}else a=this.buildLabels(o.size.collision_size,i.feature.geometry,i.layout);for(var u=0;u<a.length;u++){var l=Object.create(i);l.label=a[u],r.push(l)}}return r},buildLabels:function(e,t,r,n){var i=[];if("LineString"===t.type)Array.prototype.push.apply(i,this.buildLineLabels(t.coordinates,e,r,n));else if("MultiLineString"===t.type)for(var a=t.coordinates,s=0;s<a.length;++s)Array.prototype.push.apply(i,this.buildLineLabels(a[s],e,r,n));else if("Point"===t.type)i.push(new f.default(t.coordinates,e,r));else if("MultiPoint"===t.type)for(var u=t.coordinates,l=0;l<u.length;++l)i.push(new f.default(u[l],e,r));else if("Polygon"===t.type){var c=o.default.centroid(t.coordinates);i.push(new f.default(c,e,r))}else if("MultiPolygon"===t.type){var h=o.default.multiCentroid(t.coordinates);i.push(new f.default(h,e,r))}return i},buildLineLabels:function(e,t,r,n){var i=[],o=Math.min(r.subdiv,e.length-1);if(o>1)for(var a=(e.length-1)/o,s=0;o>s;s++){var u=Math.floor(s*a),l=Math.floor((s+1)*a)+1,c=e.slice(u,l),f=d.default.create(t,n,c,r);f&&i.push(f)}else{var h=d.default.create(t,n,e,r);h&&i.push(h)}return i}}),m.texture_id=0},{"../../geo":201,"../../gl/constants":202,"../../labels/collision":214,"../../labels/label_line":217,"../../labels/label_point":218,"../points/points":240,"../style":243}],249:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}Object.defineProperty(r,"__esModule",{value:!0}),r.TextLabels=void 0;{var o="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof 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s[i]||(s[i]={text_settings:o,ref:0}),{draw:t,text:i,text_settings_key:a,layout:d}}},parseTextSource:function(e,t,r){var n=void 0,i=t.text_source||"name";if(null!=i&&"object"===("undefined"==typeof i?"undefined":o(i))){n={};for(var a in i)n[a]=this.parseTextSourceValue(i[a],e,r)}else n=this.parseTextSourceValue(i,e,r);return n},parseTextSourceValue:function(e,t,r){var n=void 0;if(Array.isArray(e)){for(var i=0;i<e.length;i++)if("string"==typeof e[i]?n=t.properties[e[i]]:"function"==typeof e[i]&&(n=e[i](r)),n)return n}else"string"==typeof e?n=t.properties[e]:e instanceof Function&&(n=e(r));return n},prepareTextLabels:function(e,t,r){var n=this;return 0===Object.keys(this.texts[e.key]||{}).length?Promise.resolve({}):m.default.postMessage(this.main_thread_target+".calcTextSizes",this.texts[e.key]).then(function(t){return e.canceled?void h.default("trace","Style "+n.name+": stop tile build because tile was canceled: "+e.key+", 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n=t[r];e[n.text_settings_key][n.text].ref++}for(var i in e)for(var o in e[i])e[i][o].ref<1&&delete e[i][o];for(var a in e)0===Object.keys(e[a]).length&&delete e[a]},calcTextSizes:function(e){return this.canvas.textSizes(e)},rasterizeTexts:function(e,t){var r=new w.default,n=r.setTextureTextPositions(t,this.max_texture_size,e);h.default("trace","text summary for tile "+e+": fits in "+n[0]+"x"+n[1]+"px"),n[0]<this.max_texture_size&&n[1]<this.max_texture_size?(r.resize.apply(r,i(n)),r.rasterize(t,n,e)):h.default("error",["Label atlas for tile "+e+" is "+n[0]+"x"+n[1]+"px, ","but max GL texture size is "+this.max_texture_size+"x"+this.max_texture_size+"px"].join(""));var o="labels-"+e+"-"+k++;return u.default.create(this.gl,o,{element:r.canvas,filtering:"linear",UNPACK_PREMULTIPLY_ALPHA_WEBGL:!0}),u.default.retain(o),{texts:t,texture:o}},preprocessText:function(e){return e&&e.font&&"object"===o(e.font)?(e.font.fill=a.StyleParser.createPropertyCache(e.font.fill),e.font.stroke&&(e.font.stroke.color=a.StyleParser.createPropertyCache(e.font.stroke.color)),e.font.px_size=a.StyleParser.createPropertyCache(e.font.size||b.default.defaults.size,w.default.fontPixelSize),e.font.stroke&&null!=e.font.stroke.width&&(e.font.stroke.width=a.StyleParser.createPropertyCache(e.font.stroke.width,parseFloat)),e.offset=a.StyleParser.createPropertyCache(e.offset,function(e){return Array.isArray(e)&&e.map(parseFloat)||0}),e.buffer=a.StyleParser.createPropertyCache(e.buffer,function(e){return(Array.isArray(e)?e:[e,e]).map(parseFloat)||0}),e.repeat_distance=a.StyleParser.createPropertyCache(e.repeat_distance||c.default.tile_size,parseFloat),e):void 0},computeTextLayout:function(e,t,r,n,i,o,a,s,u){var l=e||{};return l=this.computeLayout(l,t,r,n,i),l.cull_from_tile=null!=r.cull_from_tile?r.cull_from_tile:!0,l.move_into_tile=null!=r.move_into_tile?r.move_into_tile:!0,l.repeat_distance&&(s&&(l.repeat_group+="/"+s),l.repeat_group+="/"+o),l.subdiv=i.overzoom2,l.align=r.align,l.italic="normal"!==a.style,"right"===u?l.orientation=1:"left"===u&&(l.orientation=-1),l}}}},{"../../geo":201,"../../gl/texture":208,"../../labels/collision":214,"../../utils/log":259,"../../utils/thread":265,"../../utils/worker_broker":269,"../style_parser":245,"../text/canvas_text":246,"../text/text_settings":250}],250:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(r,"__esModule",{value:!0});var i,o=e("../../utils/utils"),a=n(o),s=e("../../geo"),u=n(s),l=e("../style_parser");r.default=i={key:function(e){return[e.style,e.weight,e.family,e.px_size,e.fill,e.stroke,e.stroke_width,e.transform,e.text_wrap,e.max_lines,e.supersample,a.default.device_pixel_ratio].join("/")},defaults:{style:"normal",weight:null,size:"12px",px_size:12,family:"Helvetica",fill:"white",text_wrap:15,max_lines:5,align:"center",stroke:null,stroke_width:0},compute:function(e,t,r){var n={};t.font=t.font||this.defaults,n.can_articulate=t.can_articulate,n.fill=t.font.fill&&a.default.toCSSColor(l.StyleParser.evalCachedColorProperty(t.font.fill,r))||this.defaults.fill,n.style=t.font.style||this.defaults.style,n.weight=t.font.weight||this.defaults.weight,t.font.family?(n.family=t.font.family,n.family!==this.defaults.family&&(n.family+=", "+this.defaults.family)):n.family=this.defaults.family,n.transform=t.font.transform,n.size=t.font.size||this.defaults.size,n.supersample=t.supersample_text?1.5:1,n.px_size=l.StyleParser.evalCachedProperty(t.font.px_size,r)*n.supersample,t.font.stroke&&t.font.stroke.color&&(n.stroke=a.default.toCSSColor(l.StyleParser.evalCachedColorProperty(t.font.stroke.color,r)||this.defaults.stroke),n.stroke_width=l.StyleParser.evalCachedProperty(t.font.stroke.width,r)||this.defaults.stroke_width),n.font_css=this.fontCSS(n);var i=t.text_wrap;return null==i&&"line"!==u.default.geometryType(e.geometry.type)&&(i=!0),i===!0&&(i=this.defaults.text_wrap),n.text_wrap=i,n.max_lines=t.max_lines||this.defaults.max_lines,n},fontCSS:function(e){var t=e.style,r=e.weight,n=e.px_size,i=e.family;return[t,r,n+"px",i].filter(function(e){return e}).join(" ")}}},{"../../geo":201,"../../utils/utils":267,"../style_parser":245}],251:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return Array.from(e)}function o(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var a=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),s=e("./utils/log"),u=n(s),l=e("./utils/utils"),c=n(l),f=e("./utils/merge"),h=n(f),d=e("./geo"),p=n(d),_=e("./styles/style_parser"),m=e("./labels/collision"),g=n(m),v=e("./utils/worker_broker"),y=n(v),b=e("./gl/texture"),x=n(b),w=e("./utils/gl-matrix"),k=function(){function e(t){var r=t.coords,n=t.style_zoom,i=t.source,a=t.worker,s=t.view;o(this,e),this.worker=a,this.view=s,this.source=i,this.generation=null,this.visible=!1,this.proxy_for=null,this.proxy_depth=0,this.proxied_as=null,this.fade_in=!0,this.loading=!1,this.loaded=!1,this.built=!1,this.error=null,this.debug={},this.coords=e.coordinateWithMaxZoom(r,this.source.max_zoom),this.style_zoom=n,this.overzoom=Math.max(this.style_zoom-this.coords.z,0),this.overzoom2=Math.pow(2,this.overzoom),this.key=e.key(this.coords,this.source,this.style_zoom),this.min=p.default.metersForTile(this.coords),this.max=p.default.metersForTile({x:this.coords.x+1,y:this.coords.y+1,z:this.coords.z}),this.span={x:this.max.x-this.min.x,y:this.max.y-this.min.y},this.bounds={sw:{x:this.min.x,y:this.max.y},ne:{x:this.max.x,y:this.min.y}},this.center_dist=0,this.meters_per_pixel=p.default.metersPerPixel(this.style_zoom),this.meters_per_pixel_sq=this.meters_per_pixel*this.meters_per_pixel,this.units_per_pixel=p.default.units_per_pixel/this.overzoom2,this.units_per_meter_overzoom=p.default.unitsPerMeter(this.coords.z)*this.overzoom2,this.meshes={},this.textures=[],this.previous_textures=[],this.new_mesh_styles=[]}return a(e,[{key:"freeResources",value:function(){for(var e in this.meshes)this.meshes[e].destroy();this.meshes={},this.textures.forEach(function(e){return x.default.release(e)}),this.textures=[],this.previous_textures.forEach(function(e){return x.default.release(e)}),this.previous_textures=[]}},{key:"destroy",value:function(){this.workerMessage("self.removeTile",this.key),this.freeResources(),this.worker=null}},{key:"buildAsMessage",value:function(){return{key:this.key,source:this.source.name,coords:this.coords,min:this.min,max:this.max,units_per_pixel:this.units_per_pixel,meters_per_pixel:this.meters_per_pixel,meters_per_pixel_sq:this.meters_per_pixel_sq,units_per_meter_overzoom:this.units_per_meter_overzoom,style_zoom:this.style_zoom,overzoom:this.overzoom,overzoom2:this.overzoom2,generation:this.generation,debug:this.debug}}},{key:"workerMessage",value:function(){for(var e=arguments.length,t=Array(e),r=0;e>r;r++)t[r]=arguments[r];return y.default.postMessage.apply(y.default,[this.worker].concat(t))}},{key:"build",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},r=t.fade_in,n=void 0===r?!0:r;return this.generation=e,this.fade_in=n,this.loaded||(this.loading=!0,this.built=!1),this.workerMessage("self.buildTile",{tile:this.buildAsMessage()}).catch(function(e){throw e})}},{key:"buildMeshes",value:function(e,t){var r;if(!this.error){t.start&&(this.debug.geometry_count=0,this.debug.buffer_size=0);var n={},o=[],a=this.mesh_data;if(a)for(var s in a){if(a[s].vertex_data){if(!e[s]){u.default("warn","Could not create mesh because style '"+s+"' not found, for tile "+this.key+", aborting tile");break}n[s]=e[s].makeMesh(a[s].vertex_data,a[s].vertex_elements,a[s]),this.debug.buffer_size+=n[s].buffer_size,this.debug.geometry_count+=n[s].geometry_count}a[s].textures&&o.push.apply(o,i(a[s].textures))}delete this.mesh_data,t.start&&(this.new_mesh_styles=[],this.previous_textures=[].concat(i(this.textures)),this.textures=[]);for(var l in n)this.meshes[l]&&this.meshes[l].destroy(),this.meshes[l]=n[l],this.new_mesh_styles.push(l);if((r=this.textures).push.apply(r,o),t.done){for(var c in this.meshes)-1===this.new_mesh_styles.indexOf(c)&&this.meshes[c].destroy();this.new_mesh_styles=[],this.previous_textures.forEach(function(e){return x.default.release(e)}),this.previous_textures=[],this.debug.geometry_ratio=(this.debug.geometry_count/this.debug.feature_count).toFixed(1),this.printDebug()}}}},{key:"update",value:function(){var t=this.coords;t.z!==this.view.center.tile.z&&(t=e.coordinateAtZoom(t,this.view.center.tile.z)),this.center_dist=Math.abs(this.view.center.tile.x-t.x)+Math.abs(this.view.center.tile.y-t.y)}},{key:"setProxyFor",value:function(e){e?(this.visible=!0,this.proxy_for=this.proxy_for||[],this.proxy_for.push(e),this.proxy_depth=1,e.proxied_as=e.style_zoom>this.style_zoom?"child":"parent",this.update()):(this.proxy_for=null,this.proxy_depth=0)}},{key:"shouldProxyForStyle",value:function(e){return!this.proxy_for||this.proxy_for.some(function(t){return null==t.meshes[e]})}},{key:"setupProgram",value:function(e,t){var r=e.model,n=e.model32;t.uniform("4fv","u_tile_origin",[this.min.x,this.min.y,this.style_zoom,this.coords.z]),t.uniform("1f","u_tile_proxy_depth",this.proxy_depth),w.mat4.identity(r),w.mat4.translate(r,r,w.vec3.fromValues(this.min.x,this.min.y,0)),w.mat4.scale(r,r,w.vec3.fromValues(this.span.x/p.default.tile_scale,-1*this.span.y/p.default.tile_scale,1)),w.mat4.copy(n,r),t.uniform("Matrix4fv","u_model",n),t.uniform("1i","u_tile_fade_in",this.fade_in&&"child"!==this.proxied_as)}},{key:"merge",value:function(e){return this.loading=e.loading,this.loaded=e.loaded,this.generation=e.loaded,this.error=e.error,this.mesh_data=e.mesh_data,this.debug=h.default(this.debug,e.debug),this}},{key:"printDebug",value:function(){u.default("debug","Tile: debug for "+this.key+": [  "+JSON.stringify(this.debug)+" ]")}}],[{key:"create",value:function(t){return new e(t)}},{key:"coord",value:function(t){return{x:t.x,y:t.y,z:t.z,key:e.coordKey(t)}}},{key:"coordKey",value:function(e){var t=e.x,r=e.y,n=e.z;return t+"/"+r+"/"+n}},{key:"key",value:function(t,r,n){return t=e.coordinateWithMaxZoom(t,r.max_zoom),t.y<0||t.y>=1<<t.z||t.z<0?void 0:[r.name,n,t.x,t.y,t.z].join("/")}},{key:"coordinateAtZoom",value:function(t,r){{var n=t.x,i=t.y,o=t.z;t.key}if(o!==r){var a=Math.pow(2,o-r);n=Math.floor(n/a),i=Math.floor(i/a),o=r}return e.coord({x:n,y:i,z:o})}},{key:"coordinateWithMaxZoom",value:function(t,r){var n=t.x,i=t.y,o=t.z;return void 0!==r&&o>r?e.coordinateAtZoom({x:n,y:i,z:o},r):e.coord({x:n,y:i,z:o})}},{key:"childrenForCoordinate",value:function(t){var r=t.x,n=t.y,i=t.z,o=t.key;return e.coord_children[o]||(i++,r*=2,n*=2,e.coord_children[o]=[e.coord({x:r,y:n,z:i}),e.coord({x:r+1,y:n,z:i}),e.coord({x:r,y:n+1,z:i}),e.coord({x:r+1,y:n+1,z:i})]),e.coord_children[o]}},{key:"isDescendant",value:function(t,r){if(r.z>t.z){var n=e.coordinateAtZoom(r,t.z),i=n.x,o=n.y;return t.x===i&&t.y===o}return!1}},{key:"sort",value:function(e){return e.sort(function(e,t){var r=e.center_dist,n=t.center_dist;return n>r?-1:n===r?0:1})}},{key:"cancel",value:function(t){t&&(t.canceled=!0,t.source_data&&t.source_data.request_id&&(c.default.cancelRequest(t.source_data.request_id),t.source_data.request_id=null),e.abortBuild(t))}},{key:"buildGeometry",value:function(t,r){var n=r.scene_id,i=r.layers,o=r.styles,a=r.global,s=t.source_data;t.debug.rendering=+new Date,t.debug.feature_count=0,g.default.startTile(t.key);for(var l in i){var c=i[l];if(c&&c.config_data){if(c.config_data.source===t.source)for(var f=e.getDataForSource(s,c.config_data,l),h=0;h<f.length;h++){var d=f[h],p=d.geom;if(p)for(var m=0;m<p.features.length;m++){var v=p.features[m];if(null!=v.geometry){var y=_.StyleParser.getFeatureParseContext(v,t,a);y.winding=t.default_winding,y.source=t.source,y.layer=d.layer;var b=c.buildDrawGroups(y,!0);if(b){for(var x in b){var w=b[x];if(w.visible){var k=w.style||x,A=o[k];A?(y.layers=w.layers,A.addFeature(v,w,y)):u.default("warn","Style '"+k+"' not found, skipping layer '"+l+"':",w,v)}}t.debug.feature_count++}}}}}else u.default("warn","Layer "+l+" was defined without a geometry data source and will not be rendered.")}t.debug.rendering=+new Date-t.debug.rendering;var T=this.stylesForTile(t.key,o).map(function(e){return o[e]});e.sendStyleGroups(t,T,{scene_id:n},function(e){return e.collision?"collision":"non-collision"})}},{key:"stylesForTile",value:function(e,t){var r=[];for(var n in t)t[n].hasDataForTile(e)&&r.push(n);return r}},{key:"sendStyleGroups",value:function(t,r,n,i){var o=n.scene_id,a={};r.forEach(function(e){var t=i(e);a[t]=a[t]||[],a[t].push(e)}),Object.keys(a).length>0?!function(){var r={start:!0};t.mesh_data={};var n=function(n){var i=a[n];Promise.all(i.map(function(e){return e.endData(t).then(function(r){r&&(t.mesh_data[e.name]={vertex_data:r.vertex_data,vertex_elements:r.vertex_elements,uniforms:r.uniforms,textures:r.textures})})})).then(function(){u.default("trace","Finished style group '"+n+"' for tile "+t.key),a[n]=[],Object.keys(a).every(function(e){return 0===a[e].length})&&(r.done=!0),y.default.postMessage("TileManager_"+o+".buildTileStylesCompleted",y.default.withTransferables({tile:e.slice(t,["mesh_data"]),progress:r})),r.start=null,t.mesh_data={},r.done&&g.default.resetTile(t.key)})};for(var i in a)n(i)}():(y.default.postMessage("TileManager_"+o+".buildTileStylesCompleted",y.default.withTransferables({tile:e.slice(t),progress:{start:!0,done:!0}})),g.default.resetTile(t.key))}},{key:"getDataForSource",value:function(e,t){var r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:null,n=[];return null!=t&&null!=e&&null!=e.layers&&(!t.layer&&e.layers._default?n.push({geom:e.layers._default}):!t.layer&&r?n.push({layer:r,geom:e.layers[r]}):"string"==typeof t.layer?n.push({layer:t.layer,geom:e.layers[t.layer]}):Array.isArray(t.layer)&&t.layer.forEach(function(t){e.layers[t]&&e.layers[t].features&&n.push({layer:t,geom:e.layers[t]})})),n}},{key:"abortBuild",value:function(e){if(e.mesh_data)for(var t in e.mesh_data){var r=e.mesh_data[t].textures;r&&r.forEach(function(t){var r=x.default.textures[t];r&&(u.default("trace","releasing texture "+t+" for tile "+e.key),r.release())})}}},{key:"slice",value:function(e,t){var r=["key","loading","loaded","generation","error","debug"];Array.isArray(t)&&r.push.apply(r,i(t));for(var n={},o=0;o<r.length;o++){var a=r[o];n[a]=e[a]}return n}}]),e}();r.default=k,k.coord_children={}},{"./geo":201,"./gl/texture":208,"./labels/collision":214,"./styles/style_parser":245,"./utils/gl-matrix":257,"./utils/log":259,"./utils/merge":261,"./utils/utils":267,"./utils/worker_broker":269}],252:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}Object.defineProperty(r,"__esModule",{value:!0});var o=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}(),a=e("./tile"),s=n(a),u=e("./tile_pyramid"),l=n(u),c=e("./utils/log"),f=n(c),h=e("./utils/worker_broker"),d=n(h),p=function(){function e(t){var r=t.scene,n=t.view;i(this,e),this.scene=r,this.view=n,this.tiles={},this.pyramid=new l.default,this.visible_coords={},this.queued_coords=[],this.building_tiles=null,this.renderable_tiles=[],this.active_styles=[],this.main_thread_target=["TileManager",this.scene.id].join("_"),d.default.addTarget(this.main_thread_target,this)}return o(e,[{key:"destroy",value:function(){this.forEachTile(function(e){return e.destroy()}),this.tiles={},this.pyramid=null,this.visible_coords={},this.queued_coords=[],this.scene=null,this.view=null}},{key:"keepTile",value:function(e){this.tiles[e.key]=e,this.pyramid.addTile(e)}},{key:"hasTile",value:function(e){return void 0!==this.tiles[e]}},{key:"forgetTile",value:function(e){if(this.hasTile(e)){var t=this.tiles[e];this.pyramid.removeTile(t)}delete this.tiles[e],this.tileBuildStop(e)}},{key:"removeTile",value:function(e){f.default("trace","tile unload for "+e);var t=this.tiles[e];null!=t&&t.destroy(),this.forgetTile(t.key),this.scene.requestRedraw()}},{key:"forEachTile",value:function(e){for(var t in this.tiles)e(this.tiles[t])}},{key:"removeTiles",value:function(e){var t=[];for(var r in this.tiles){var n=this.tiles[r];e(n)&&t.push(r)}for(var i=0;i<t.length;i++){var o=t[i];this.removeTile(o)}}},{key:"updateTilesForView",value:function(){this.visible_coords={};for(var e=this.view.findVisibleTileCoordinates(),t=0;t<e.length;t++){var r=e[t];this.queueCoordinate(r),this.visible_coords[r.key]=r}this.updateTileStates()}},{key:"updateTileStates",value:function(){var e=this;this.forEachTile(function(t){e.updateVisibility(t),t.update()}),this.loadQueuedCoordinates(),this.updateProxyTiles(),this.view.pruneTilesForView(),this.updateRenderableTiles(),this.updateActiveStyles()}},{key:"updateProxyTiles",value:function(){var e=this;if(0!==this.view.zoom_direction){this.forEachTile(function(e){return e.setProxyFor(null)});var t=!1;this.forEachTile(function(r){if(1===e.view.zoom_direction){if(r.visible&&!r.built&&r.coords.z>0){var n=e.pyramid.getAncestor(r);n&&(n.setProxyFor(r),t=!0)}}else if(-1===e.view.zoom_direction&&r.visible&&!r.built)for(var i=e.pyramid.getDescendants(r),o=0;o<i.length;o++)i[o].setProxyFor(r),t=!0}),t||(this.view.zoom_direction=0)}}},{key:"updateVisibility",value:function(e){if(e.visible=!1,e.style_zoom===this.view.tile_zoom)if(this.visible_coords[e.coords.key])e.visible=!0;else for(var t in this.visible_coords)if(s.default.isDescendant(e.coords,this.visible_coords[t])){e.visible=!0;break}}},{key:"pruneToVisibleTiles",value:function(){this.removeTiles(function(e){return!e.visible})}},{key:"getRenderableTiles",value:function(){return this.renderable_tiles}},{key:"updateRenderableTiles",value:function(){this.renderable_tiles=[];for(var e in this.tiles){var t=this.tiles[e];t.visible&&t.loaded&&this.renderable_tiles.push(t)}return this.renderable_tiles}},{key:"getActiveStyles",value:function(){return this.active_styles}},{key:"updateActiveStyles",value:function(){for(var e=this.renderable_tiles,t={},r=0;r<e.length;r++){var n=e[r];Object.keys(n.meshes).forEach(function(e){return t[e]=!0})}return this.active_styles=Object.keys(t),this.active_styles}},{key:"isLoadingVisibleTiles",value:function(){var e=this;return Object.keys(this.tiles).some(function(t){return e.tiles[t].visible&&!e.tiles[t].built})}},{key:"queueCoordinate",value:function(e){this.queued_coords[this.queued_coords.length]=e}},{key:"loadQueuedCoordinates",value:function(){var e=this;0!==this.queued_coords.length&&(this.queued_coords.sort(function(t,r){var n=Math.abs(e.view.center.tile.x-t.x)+Math.abs(e.view.center.tile.y-t.y),i=Math.abs(e.view.center.tile.x-r.x)+Math.abs(e.view.center.tile.y-r.y);return i>n?-1:i===n?0:1}),this.queued_coords.forEach(function(t){return e.loadCoordinate(t)}),this.queued_coords=[])}},{key:"loadCoordinate",value:function(e){if(e.z===this.view.center.tile.z)for(var t in this.scene.sources){var r=this.scene.sources[t];if(r.builds_geometry_tiles&&r.includesTile(e,this.view.tile_zoom)){var n=s.default.key(e,r,this.view.tile_zoom);if(n&&!this.hasTile(n)){var i=s.default.create({source:r,coords:e,worker:this.scene.getWorkerForDataSource(r),style_zoom:this.view.styleZoom(e.z),view:this.view});this.keepTile(i),this.buildTile(i)}}}}},{key:"buildTiles",value:function(e){var t=this;s.default.sort(e).forEach(function(e){return t.buildTile(e)}),this.checkBuildQueue()}},{key:"buildTile",value:function(e,t){this.tileBuildStart(e.key),this.updateVisibility(e),e.update(),e.build(this.scene.generation,t)}},{key:"buildTileStylesCompleted",value:function(e){var t=e.tile,r=e.progress;null==this.tiles[t.key]?(f.default("trace","discarded tile "+t.key+" in TileManager.buildTileStylesCompleted because previously removed"),s.default.abortBuild(t),this.updateTileStates()):t.generation!==this.scene.generation?(f.default("debug","discarded tile "+t.key+" in TileManager.buildTileStylesCompleted because built with "+("scene config gen "+t.generation+", current "+this.scene.generation)),s.default.abortBuild(t),this.updateTileStates()):(this.tiles[t.key]&&(t=this.tiles[t.key].merge(t)),r.done&&(t.built=!0),t.buildMeshes(this.scene.styles,r),this.updateTileStates(),this.scene.requestRedraw()),r.done&&this.tileBuildStop(t.key)}},{key:"buildTileError",value:function(e){f.default("error","Error building tile "+e.key+":",e.error),this.forgetTile(e.key),s.default.abortBuild(e)}},{key:"tileBuildStart",value:function(e){this.building_tiles=this.building_tiles||{},this.building_tiles[e]=!0,f.default("trace","tileBuildStart for "+e+": "+Object.keys(this.building_tiles).length)}},{key:"tileBuildStop",value:function(e){this.building_tiles&&(f.default("trace","tileBuildStop for "+e+": "+Object.keys(this.building_tiles).length),delete this.building_tiles[e],this.checkBuildQueue())}},{key:"checkBuildQueue",value:function(){this.building_tiles&&0!==Object.keys(this.building_tiles).length||(this.building_tiles=null,this.scene.tileManagerBuildDone())}},{key:"getDebugProp",value:function(e,t){var r=[];for(var n in this.tiles)null==this.tiles[n].debug[e]||"function"==typeof t&&t(this.tiles[n])!==!0||r.push(this.tiles[n].debug[e]);return r}},{key:"getDebugSum",value:function(e,t){var r=0;for(var n in this.tiles)null==this.tiles[n].debug[e]||"function"==typeof t&&t(this.tiles[n])!==!0||(r+=this.tiles[n].debug[e]);return r}},{key:"getDebugAverage",value:function(e,t){return this.getDebugSum(e,t)/Object.keys(this.tiles).length}}]),e}();r.default=p},{"./tile":251,"./tile_pyramid":253,"./utils/log":259,"./utils/worker_broker":269}],253:[function(e,t,r){"use strict";function n(e){return e&&e.__esModule?e:{"default":e}}function i(e){if(Array.isArray(e)){for(var t=0,r=Array(e.length);t<e.length;t++)r[t]=e[t];return r}return 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e(t,r){i(this,e),m.default(this),this.scene=t,this.createMatrices(),this.zoom=null,this.center=null,this.bounds=null,this.meters_per_pixel=null,this.panning=!1,this.panning_stop_at=0,this.pan_snap_timer=0,this.zooming=!1,this.zoom_direction=0,this.size={css:{},device:{},meters:{}},this.aspect=null,this.buffer=0,this.continuous_zoom="boolean"==typeof r.continuousZoom?r.continuousZoom:!0,this.wrap=r.wrapView===!1?!1:!0,this.tile_simplification_level=0,this.preserve_tiles_within_zoom=1,this.reset()}return a(e,[{key:"reset",value:function(){this.createCamera()}},{key:"createCamera",value:function(){var e=this.getActiveCamera();e&&(this.camera=h.default.create(e,this,this.scene.config.cameras[e]),this.camera.updateView())}},{key:"getActiveCamera",value:function(){if(this.scene.config&&this.scene.config.cameras){for(var e in this.scene.config.cameras)if(this.scene.config.cameras[e].active)return e;var t=Object.keys(this.scene.config.cameras);return t.length&&t[0]}}},{key:"setActiveCamera",value:function(e){var t=this.getActiveCamera();return this.scene.config.cameras[e]&&(this.scene.config.cameras[e].active=!0,t&&t!==e&&this.scene.config.cameras[t]&&delete this.scene.config.cameras[t].active),this.scene.updateConfig({rebuild:!1}),this.getActiveCamera()}},{key:"update",value:function(){this.camera.update(),this.pan_snap_timer=(+new Date-this.panning_stop_at)/1e3}},{key:"setViewportSize",value:function(e,t){this.size.css={width:e,height:t},this.size.device={width:Math.round(this.size.css.width*p.default.device_pixel_ratio),height:Math.round(this.size.css.height*p.default.device_pixel_ratio)},this.aspect=this.size.css.width/this.size.css.height,this.updateBounds()}},{key:"setView",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=e.lng,r=e.lat,n=e.zoom,i=!1;return"number"==typeof t&&"number"==typeof r&&(this.center&&t===this.center.lng&&r===this.center.lat||(i=!0,this.center={lng:t,lat:r})),"number"==typeof n&&n!==this.zoom&&(i=!0,this.setZoom(n)),i&&this.updateBounds(),i}},{key:"setZoom",value:function(e){this.zooming?this.zooming=!1:this.last_zoom=this.zoom;var t=this.tile_zoom,r=this.tileZoom(e);this.continuous_zoom||(e=r),r!==t&&(this.zoom_direction=r>t?1:-1),this.last_zoom=this.zoom,this.zoom=e,this.tile_zoom=r,this.updateBounds(),this.scene.requestRedraw()}},{key:"startZoom",value:function(){this.last_zoom=this.zoom,this.zooming=!0}},{key:"baseZoom",value:function(e){return Math.floor(e)}},{key:"tileZoom",value:function(e){return Math.max(this.baseZoom(e)-this.tile_simplification_level,0)}},{key:"styleZoom",value:function(e){return this.baseZoom(e)+this.tile_simplification_level}},{key:"setPanning",value:function(e){this.panning=e,this.panning||(this.panning_stop_at=+new Date)}},{key:"ready",value:function(){return"number"!=typeof this.size.css.width||"number"!=typeof this.size.css.height||null==this.center||"number"!=typeof this.zoom?!1:!0}},{key:"updateBounds",value:function(){if(this.ready()){this.meters_per_pixel=u.default.metersPerPixel(this.zoom),this.size.meters={x:this.size.css.width*this.meters_per_pixel,y:this.size.css.height*this.meters_per_pixel};var e=u.default.latLngToMeters([this.center.lng,this.center.lat]),t=o(e,2),r=t[0],n=t[1];this.center.meters={x:r,y:n},this.center.tile=u.default.tileForMeters([this.center.meters.x,this.center.meters.y],this.tile_zoom),this.bounds={sw:{x:this.center.meters.x-this.size.meters.x/2,y:this.center.meters.y-this.size.meters.y/2},ne:{x:this.center.meters.x+this.size.meters.x/2,y:this.center.meters.y+this.size.meters.y/2}},this.scene.tile_manager.updateTilesForView(),this.trigger("move"),this.scene.requestRedraw()}}},{key:"findVisibleTileCoordinates",value:function(){if(!this.bounds)return[];var e=this.tile_zoom,t=u.default.tileForMeters([this.bounds.sw.x,this.bounds.sw.y],e),r=u.default.tileForMeters([this.bounds.ne.x,this.bounds.ne.y],e),n=[t.x-this.buffer,r.x+this.buffer,r.y-this.buffer,t.y+this.buffer];if(this.wrap===!1){var i=(1<<e)-1;n=n.map(function(e){return Math.min(Math.max(0,e),i)})}for(var o=[],a=n[0];a<=n[1];a++)for(var s=n[2];s<=n[3];s++)o.push(c.default.coord({x:a,y:s,z:e}));return o}},{key:"pruneTilesForView",value:function(){var e=this;if(this.ready()){var t=[Math.ceil((Math.floor(this.size.css.width/u.default.tile_size)+2)/2),Math.ceil((Math.floor(this.size.css.height/u.default.tile_size)+2)/2)];this.scene.tile_manager.removeTiles(function(r){if(r.visible||r.proxy_for)return!1;if(r.loading&&r.style_zoom!==e.tile_zoom)return!0;var n=Math.abs(r.style_zoom-e.tile_zoom);if(n>e.preserve_tiles_within_zoom)return!0;var i=c.default.coordinateAtZoom(r.coords,e.tile_zoom);return Math.abs(i.x-e.center.tile.x)-t[0]>e.buffer?(v.default("trace","View: remove tile "+r.key+" (as "+i.x+"/"+i.y+"/"+e.tile_zoom+") for being too far out of visible area ***"),!0):Math.abs(i.y-e.center.tile.y)-t[1]>e.buffer?(v.default("trace","View: remove tile "+r.key+" (as "+i.x+"/"+i.y+"/"+e.tile_zoom+") for being too far out of visible area ***"),!0):!1})}}},{key:"createMatrices",value:function(){this.matrices={},this.matrices.model=new Float64Array(16),this.matrices.model32=new Float32Array(16),this.matrices.model_view=new Float64Array(16),this.matrices.model_view32=new Float32Array(16),this.matrices.normal=new Float64Array(9),this.matrices.normal32=new Float32Array(9),this.matrices.inverse_normal32=new Float32Array(9)}},{key:"setupTile",value:function(e,t){e.setupProgram(this.matrices,t),this.camera.setupMatrices(this.matrices,t)}},{key:"setupProgram",value:function(e){e.uniform("2fv","u_resolution",[this.size.device.width,this.size.device.height]),e.uniform("3fv","u_map_position",[this.center.meters.x,this.center.meters.y,this.zoom]),e.uniform("1f","u_meters_per_pixel",this.meters_per_pixel),e.uniform("1f","u_device_pixel_ratio",p.default.device_pixel_ratio),e.uniform("1f","u_view_pan_snap_timer",this.pan_snap_timer),e.uniform("1i","u_view_panning",this.panning),this.camera.setupProgram(e)}},{key:"isAnimating",value:function(){return this.pan_snap_timer<=y}}]),e}();r.default=b},{"./camera":200,"./geo":201,"./tile":251,"./utils/log":259,"./utils/subscribe":264,"./utils/utils":267}]},{},[225])(225)})}();
\ No newline at end of file
diff --git a/package.json b/package.json
index 3dc918a70..db49c7c40 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tangram",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "description": "WebGL Maps for Vector Tiles",
   "repository": {
     "type": "git",