From 53e08fd34b6a625664c8c5bac7a20aae0bdccf02 Mon Sep 17 00:00:00 2001
From: Jakub Jankiewicz <jcubic@onet.pl>
Date: Wed, 1 May 2019 12:31:43 +0200
Subject: [PATCH] fix c[ad]+r when access nil + typececk

---
 CHANGELOG.md     |  2 ++
 dist/lips.js     | 26 +++++++++++++++++++++++++-
 dist/lips.min.js |  4 ++--
 src/lips.js      | 16 ++++++++++++++++
 4 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b2c6f48..d5e11344 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@
 * remove `nop` (you can use `(begin undefined)`)
 ### Bug fixes
 * fix unquote-splicing on nil (e.g. processing of `` `(list ,@nil)``)
+* cdr and car should return nil on empty list
+* typecheck and process nil in c[ad]+r functions
 
 ## 0.11.1
 ### Bug fixes
diff --git a/dist/lips.js b/dist/lips.js
index 933ba85f..750c50b5 100644
--- a/dist/lips.js
+++ b/dist/lips.js
@@ -21,7 +21,7 @@
  * http://javascript.nwbox.com/ContentLoaded/
  * http://javascript.nwbox.com/ContentLoaded/MIT-LICENSE
  *
- * build: Wed, 01 May 2019 10:23:31 +0000
+ * build: Wed, 01 May 2019 10:31:05 +0000
  */
 (function () {
 'use strict';
@@ -3381,12 +3381,30 @@ function _typeof(obj) {
     }, "(cons left right)\n\n            Function return new Pair out of two arguments."),
     // ------------------------------------------------------------------
     car: doc(function (list) {
+      if (list === nil) {
+        return nil;
+      }
+
       typecheck('car', list, 'pair');
+
+      if (isEmptyList(list)) {
+        return nil;
+      }
+
       return list.car;
     }, "(car pair)\n\n            Function returns car (head) of the list/pair."),
     // ------------------------------------------------------------------
     cdr: doc(function (list) {
+      if (list === nil) {
+        return nil;
+      }
+
       typecheck('cdr', list, 'pair');
+
+      if (isEmptyList(list)) {
+        return nil;
+      }
+
       return list.cdr;
     }, "(cdr pair)\n\n            Function returns cdr (tail) of the list/pair."),
     // ------------------------------------------------------------------
@@ -4816,6 +4834,12 @@ function _typeof(obj) {
     var name = 'c' + spec + 'r';
     global_env.set(name, doc(function (arg) {
       return chars.reduce(function (list, type) {
+        if (list === nil) {
+          return nil;
+        }
+
+        typecheck(name, list, 'pair');
+
         if (type === 'a') {
           return list.car;
         } else {
diff --git a/dist/lips.min.js b/dist/lips.min.js
index fb9fe137..bba062bc 100644
--- a/dist/lips.min.js
+++ b/dist/lips.min.js
@@ -21,6 +21,6 @@
  * http://javascript.nwbox.com/ContentLoaded/
  * http://javascript.nwbox.com/ContentLoaded/MIT-LICENSE
  *
- * build: Wed, 01 May 2019 10:23:31 +0000
+ * build: Wed, 01 May 2019 10:31:05 +0000
  */
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t!=="undefined"&&this.value instanceof t&&!e instanceof t){e=new t(e)}return ln(e)};ln.prototype.op=function(n,e){var t={"*":function n(e,t){return e*t},"+":function n(e,t){return e+t},"-":function n(e,t){return e-t},"/":function n(e,t){return e/t},"%":function n(e,t){return e%t},"|":function n(e,t){return e|t},"&":function n(e,t){return e&t},"~":function n(e){return~e},">>":function n(e,t){return e>>t},"<<":function n(e,t){return e<<t}};if(ln.isFloat(e)||e instanceof ln&&(ln.isFloat(e.value)||e.float)||ln.isFloat(this.value)||this.float){var r=e instanceof ln?e.valueOf():e;return ln(t[n](this.valueOf(),r),true)}e=this.coerce(e);if(ln.isNative(e.value)&&ln.isNative(this.value)){return ln(t[n](this.value,e.value))}if(ln.isBN(this.value)&&ln.isBN(e.value)){var i={"+":"iadd","-":"isub","*":"imul","/":"idiv","%":"imod","|":"ior","&":"iand","~":"inot","<<":"ishrn",">>":"ishln"};n=i[n];return ln(this.value.clone()[n](e,r))}};var hn={"+":"add","-":"sub","*":"mul","/":"div","%":"mod","|":"or","&":"and","~":"neg","<<":"shl",">>":"shr"};Object.keys(hn).forEach(function(e){ln.prototype[hn[e]]=function(n){return this.op(e,n)}});ln.prototype.sqrt=function(){var n;if(ln.isNative(this.value)){n=Math.sqrt(this.value)}else if(ln.isBN(this.value)){n=this.value.sqrt()}return new ln(n)};ln.prototype.pow=function(n){n=this.coerce(n);if(ln.isNative(this.value)){try{var e=new Function("a,b","return a**b;");n.value=e(this.value,n.value)}catch(n){throw new Error("Power operator not supported")}}else if(ln.isBN(this.value)){n.value=this.value.pow(n.value)}else{n.value=Math.pow(this.value,n.value)}return n};ln.prototype.neg=function(){var n=this.value;if(ln.isNative(n)){n=-n}else if(ln.isBN(n)){n=n.neg()}return new ln(n)};ln.prototype.abs=function(){var n=this.value;if(ln.isNative(this.value)){if(n<0){n=-n}}else if(ln.isBN(n)){n.iabs()}return new ln(n)};ln.prototype.isOdd=function(){if(ln.isNative(this.value)){if(this.isBigNumber()){return this.value%BigInt(2)===BigInt(1)}return this.value%2===1}else if(ln.isBN(this.value)){return this.value.isOdd()}};ln.prototype.isEven=function(){return!this.isOdd()};ln.prototype.cmp=function(n){n=this.coerce(n);if(ln.isNative(this.value)){if(this.value<n.value){return-1}else if(this.value===n.value){return 0}else{return 1}}else if(ln.isBN(this.value)){return this.value.cmp(n.value)}};function pn(n,e,t){this.env=n;this.parent=e;this.name=t}pn.prototype.inherit=function(n){var e=arguments.length>1&&arguments[1]!==g?arguments[1]:{};if(Tn(n)==="object"){e=n}if(!n||Tn(n)==="object"){n="child of "+(this.name||"unknown")}return new pn(e||{},this,n)};pn.prototype.get=function(n,e,t){t=t||this;var r;var i=false;if(n instanceof L){if(n.name in this.env){r=this.env[n.name];i=true}}else if(typeof n==="string"){if(typeof this.env[n]!=="undefined"){r=this.env[n];i=true}}if(i){if(ln.isNumber(r)){return ln(r)}if(r instanceof M){return r.markCycles()}if(typeof r==="function"){if(!r.name.match(/^bound /)){if(e){return U(r,t)}return V(r,t)}}return r}if(this.parent instanceof pn){return this.parent.get(n,e,t)}else{var a;if(n instanceof L){a=n.name}else if(typeof n==="string"){a=n}if(a){var o=Tn(c[a]);if(o==="function"){if(K(c[a])){return V(c[a],c)}return c[a]}else if(o!=="undefined"){return c[a]}}}a=(a.name||a).toString();throw new Error("Unbound variable `"+a+"'")};pn.prototype.set=function(n,e){if(ln.isNumber(e)){e=ln(e)}if(n instanceof L){n=n.name}this.env[n]=e};pn.prototype.has=function(n){return typeof this.env[n]!=="undefined"};pn.prototype.ref=function(n){var e=this;while(true){if(!e){break}if(e.has(n)){return e}e=e.parent}};function dn(n){if(Y(n)){return n.then(dn)}if(n instanceof M||n instanceof L){n.data=true}return n}function vn(n,e){this.value=n;this.count=e}vn.prototype.toString=function(){return"<#unquote["+this.count+"] "+this.value+">"};var yn=function(){var e=0;return function(){var n=arguments.length>0&&arguments[0]!==g?arguments[0]:null;if(n!==null){return new L(c.Symbol("#".concat(n)))}e++;return new L(c.Symbol("#gensym_".concat(e,"#")))}}();var mn=new pn({nil:P,undefined:g,true:true,NaN:NaN,false:false,stdout:{write:function n(){var e;(e=console).log.apply(e,arguments)}},stdin:{read:function n(){return new Promise(function(n){n(prompt(""))})}},help:v(function(n){return n.__doc__},"(help object)\n\n            Function returns documentation for function or macro."),cons:v(function(n,e){if(H(e)){e=P}return new M(n,e)},"(cons left right)\n\n            Function return new Pair out of two arguments."),car:v(function(n){_n("car",n,"pair");return n.car},"(car pair)\n\n            Function returns car (head) of the list/pair."),cdr:v(function(n){_n("cdr",n,"pair");return n.cdr},"(cdr pair)\n\n            Function returns cdr (tail) of the list/pair."),"set!":v(new J("set!",function(e){var n=arguments.length>1&&arguments[1]!==g?arguments[1]:{},t=n.dynamic_scope,r=n.error;if(t){t=this}var i=Fn(e.cdr.car,{env:this,dynamic_scope:t,error:r});i=kn(i);var a;function o(e,t){if(Y(e)){return e.then(function(n){return o(n,t)})}if(Y(t)){return t.then(function(n){return o(e,n)})}s[e]=t;return t}if(e.car instanceof M&&L.is(e.car.car,".")){var u=e.car.cdr.car;var c=e.car.cdr.cdr.car;var s=Fn(u,{env:this,dynamic_scope:t,error:r});var f=Fn(c,{env:this,dynamic_scope:t,error:r});return o(f,i)}if(!(e.car instanceof L)){throw new Error("set! first argument need to be a symbol or "+"dot accessor that evaluate to object.")}a=this.ref(e.car.name);if(!a){a=this}return d(i,function(n){a.set(e.car,n)})}),"(set! name value)\n\n            Macro that can be used to set the value of the variable (mutate)\n            it search the scope chain until it finds first non emtpy slot and set it."),"set-car!":v(function(n,e){_n("set-car!",n,"pair");n.car=e},"(set-car! obj value)\n\n            Function that set car (head) of the list/pair to specified value.\n            It can destroy the list. Old value is lost."),"set-cdr!":v(function(n,e){_n("set-cdr!",n,"pair");n.cdr=e},"(set-cdr! obj value)\n\n            Function that set cdr (tail) of the list/pair to specified value.\n            It can destroy the list. Old value is lost."),"empty?":v(function(n){return typeof n==="undefined"||H(n)},"(empty? object)\n\n            Function return true if value is undfined empty list."),assoc:v(function(n,e){if(n instanceof M&&!(e instanceof M)){throw new Error("First argument to assoc ned to be a key")}var t=e;while(true){if(!(t instanceof M)||this.get("empty?")(t)){break}var r=t.car.car;if(T(r,n)){return t.car}else if(!t.haveCycles("cdr")){t=t.cdr}}return P},"(assoc key alist)\n\n            Function search Alist (list of pairs) until it find the one that\n            have head set equal to key, and return found pair."),gensym:v(yn,"(gensym)\n\n             Function generate unique symbol, to use with macros as meta name."),load:v(function(n){_n("load",n,"string");return c.fetch(n).then(function(n){return n.text()}).then(En)},"(load filename)\n\n            Function fetch the file and evaluate its content as LIPS code."),while:v(new J("while",function(r,n){var i=n.dynamic_scope,a=n.error;var o=this;var u=new M(new L("begin"),r.cdr);var c;if(i){i=o}return function e(){var n=Fn(r.car,{env:o,dynamic_scope:i,error:a});function t(n){if(n&&!G(n)&&!H(n)){c=Fn(u,{env:o,dynamic_scope:i,error:a});if(Y(c)){return c.then(function(n){c=n;return e()})}else{return e()}}else{return c}}return d(n,t)}()}),"(while cond . body)\n\n            Macro that create a loop, it exectue body untill cond expression is false"),if:v(new J("if",function(t,n){var r=n.dynamic_scope,i=n.error;if(r){r=this}var a=this;var e=function n(e){_n("if",e,"boolean");if(e){return Fn(t.cdr.car,{env:a,dynamic_scope:r,error:i})}else{return Fn(t.cdr.cdr.car,{env:a,dynamic_scope:r,error:i})}};var o=Fn(t.car,{env:a,dynamic_scope:r,error:i});return d(o,e)}),"(if cond true-expr false-expr)\n\n            Macro evaluate condition expression and if the value is true, it\n            evaluate and return true expression if not it evaluate and return\n            false expression"),"let*":v(W(true),"(let* ((a value-a) (b value-b)) body)\n\n             Macro that creates new environment, then evaluate and assign values to\n             names and then evaluate the body in context of that environment.\n             Values are evaluated sequentialy and next value can access to\n             previous values/names."),let:v(W(false),"(let ((a value-a) (b value-b)) body)\n\n             Macro that creates new environment, then evaluate and assign values to\n             names and then evaluate the body in context of that environment.\n             Values are evaluated sequentialy but you can't access\n             previous values/names when next are evaluated. You can only get them\n             from body of let expression."),begin:v(new J("begin",function(n,e){var r=e.dynamic_scope,i=e.error;var a=this.get("list->array")(n);if(r){r=this}var o=this;var u;return function e(){if(a.length){var n=a.shift();var t=Fn(n,{env:o,dynamic_scope:r,error:i});return d(t,function(n){u=n;return e()})}else{return u}}()}),"(begin . args)\n\n             Macro runs list of expression and return valuate of the list one.\n             It can be used in place where you can only have single exression,\n             like if expression."),ignore:new J("ignore",function(n,e){var t=e.dynamic_scope,r=e.error;var i={env:this,error:r};if(t){i.dynamic_scope=this}Fn(n,i)},"(ignore expression)\n\n            Macro that will evaluate expression and swallow any promises that may\n            be created. It wil run and ignore any value that may be returned by\n            expression. The code should have side effects and/or when it's promise\n            it should resolve to undefined."),timer:v(new J("timer",function(e){var n=arguments.length>1&&arguments[1]!==g?arguments[1]:{},t=n.dynamic_scope,r=n.error;_n("timer",e.car,"number");var i=this;if(t){t=this}return new Promise(function(n){setTimeout(function(){n(Fn(e.cdr.car,{env:i,dynamic_scope:t,error:r}))},e.car)}).then(dn)}),"(timer time expression)\n\n             Function return a promise, and it will be automatically evaluated\n             after specific time passes. The return value of the function\n             will be value of the timer exprssion. If you want to do side effect\n             only expression you can wrap your expression in nol call."),define:v(J.defmacro("define",function(e,n){var t=this;if(e.car instanceof M&&e.car.car instanceof L){var r=new M(new L("define"),new M(e.car.car,new M(new M(new L("lambda"),new M(e.car.cdr,e.cdr)))));return r}else if(n.macro_expand){return}if(n.dynamic_scope){n.dynamic_scope=this}n.env=t;var i=e.cdr.car;if(i instanceof M){i=Fn(i,n)}else if(i instanceof L){i=t.get(i)}if(e.car instanceof L){d(i,function(n){t.set(e.car,n)})}}),"(define name expression)\n             (define (function-name . args) body)\n\n             Macro for defining values. It can be used to define variables,\n             or function. If first argument is list it will create function\n             with name beeing first element of the list. The macro evalute\n             code `(define function (lambda args body))`"),"set-obj!":v(function(n,e,t){if(Tn(n)!=="object"||G(n)){throw new Error(wn("set-obj!",xn(n),"object"))}n[e]=t},"(set-obj! obj key value)\n\n            Function set property of JavaScript object"),"current-environment":v(function(){return this},"(current-environment)\n\n            Function return current environement."),eval:v(function(n,t){var r=this;t=t||this;if(n instanceof L){return t.get(n)}if(n instanceof M){return Fn(n,{env:t,dynamic_scope:this,error:function n(e){return r.get("print")(e.message)}})}if(n instanceof Array){var i=this.get("eval");return n.reduce(function(n,e){return i(e,t)})}},"(eval list)\n\n            Function evalute LIPS code as list structure."),lambda:new J("lambda",function(s){var n=arguments.length>1&&arguments[1]!==g?arguments[1]:{},f=n.dynamic_scope,l=n.error;var h=this;var p;if(s.cdr instanceof M&&typeof s.cdr.car==="string"&&s.cdr.cdr!==P){p=s.cdr.car}function e(){var n=(f?this:h).inherit("lambda");var e=s.car;var t=0;var r;if(e instanceof L||!H(e)){for(var i=arguments.length,a=new Array(i),o=0;o<i;o++){a[o]=arguments[o]}while(true){if(e.car!==P){if(e instanceof L){r=M.fromArray(a.slice(t));n.env[e.name]=r;break}else{if(typeof a[t]==="undefined"){r=P}else{r=a[t]}n.env[e.car.name]=r}}if(e.cdr===P){break}t++;e=e.cdr}}if(f){f=n}var u=p?s.cdr.cdr:s.cdr;var c=new M(new L("begin"),u);return Fn(c,{env:n,dynamic_scope:f,error:l})}var t=s.car instanceof M?s.car.length():null;if(!(s.car instanceof M)){return v(e,p,true)}e.__code__=new M(new L("lambda"),s);return v(X(e,t),p,true)},"(lambda (a b) body)\n            (lambda args body)\n            (lambda (a b . rest) body)\n\n            Macro lambda create new anonymous function, if first element of the body\n            is string and there is more elements it will be documentation, that can\n            be read using (help fn)"),macroexpand:new J("macro-expand",D()),"macroexpand-1":new J("macro-expand",D(true)),"define-macro":v(new J($,function(c,n){var s=n.dynamic_scope,f=n.error;function l(n){if(n instanceof M){delete n.data}return n}if(c.car instanceof M&&c.car.car instanceof L){var e=c.car.car.name;var h;if(typeof c.cdr.car==="string"&&c.cdr.cdr!==P){h=c.cdr.car}this.env[e]=J.defmacro(e,function(n,e){var t=e.macro_expand;var r=new pn({},this,"defmacro");var i=c.car.cdr;var a=n;while(true){if(i===P){break}if(i instanceof L){r.env[i.name]=a;break}else if(i.car!==P&&a.car!==P){r.env[i.car.name]=a.car}if(i.cdr===P){break}a=a.cdr;i=i.cdr}if(s){s=r}if(c.cdr instanceof M){var o=h?c.cdr.cdr:c.cdr;var u=o.reduce(function(n,e){return Fn(e,{env:r,dynamic_scope:s,error:f})});if(t){return u}u=Fn(u,{env:this,dynamic_scope:s,error:f});return d(u,l)}},h)}}),"(define-macro (name . args) body)\n\n             Meta macro, macro that create new macros, if return value is list structure\n             it will be evaluated when macro is invoked. You can use quasiquote ` and\n             unquote , and unquote-splicing ,@ inside to create expression that will be\n             evaluated on runtime. Macros works like this: if you pass any expression to\n             macro the arguments will not be evaluated unless macro itself evaluate it.\n             Because of this macro can manipulate expression (arguments) as lists."),quote:v(new J("quote",function(n){return dn(n.car)}),"(quote expression)\n\n             Macro that return single lips expression as data (it don't evaluate its\n             argument). It will return list of pairs if put in front of lips code.\n             And if put in fron of symbol it will return that symbol not value\n             associated with that name."),"unquote-splicing":v(function(){throw new Error("You can't call `unquote-splicing` outside of quasiquote")},"(unquote-splicing code)\n\n            Special form to be used in quasiquote macro, parser is processing special\n            characters ,@ and create call to this pseudo function. It can be used\n            to evalute expression inside and return the value without parenthesis.\n            the value will be joined to the output list structure."),unquote:v(function(){throw new Error("You can't call `unquote` outside of quasiquote")},"(unquote code)\n\n            Special form to be used in quasiquote macro, parser is processing special\n            characters , and create call to this pseudo function. It can be used\n            to evalute expression inside and return the value, the output is inserted\n            into list structure created by queasiquote."),quasiquote:v(new J("quasiquote",function(n,e){var o=e.dynamic_scope,u=e.error;var c=this;var s=0;if(o){o=c}function a(n){return n instanceof M}function f(n,e){var t=arguments.length>2&&arguments[2]!==g?arguments[2]:a;if(n instanceof M&&!H(n)){var r=n.car;var i=n.cdr;if(t(r)){r=e(r)}if(t(i)){i=e(i)}if(Y(r)||Y(i)){return Promise.all([r,i]).then(function(n){var e=Rn(n,2),t=e[0],r=e[1];return new M(t,r)})}else{return new M(r,i)}}return n}function l(n,e){if(n instanceof M){if(H(n)&&e===P){return P}n.append(e)}else{n=new M(n,e)}return n}function h(t){if(t instanceof M&&!H(t)){var n;if(L.is(t.car.car,"unquote-splicing")){n=Fn(t.car.cdr.car,{env:c,dynamic_scope:o,error:u});return d(n,function(e){if(!e instanceof M){throw new Error("Value of unquote-splicing need"+" to be pair")}var n=h(t.cdr);if(n===P&&e===P){return g}return d(n,function(n){return l(e,n)})})}if(L.is(t.car,"unquote")){var e=t.cdr;var r=e;var i=r;var a=1;while(L.is(r.car.car,"unquote")){i=r;a++;r=r.car.cdr.car}if(a>s){s=a}if(i===r){if(t.cdr.cdr!==P){return d(h(t.cdr.cdr),function(n){return new M(new vn(t.cdr.car,a),n)})}else{return new vn(t.cdr.car,a)}}else if(i.cdr.cdr!==P){return d(h(i.cdr.cdr),function(n){i.car.cdr=new M(new vn(r,a),i.cdr===P?P:n);return e.car})}else{i.car.cdr=new vn(r,a)}return e.car}return f(t,h)}return t}var t=function n(e){return a(e)||e instanceof vn};function r(n){if(n instanceof vn){if(s===n.count){return Fn(n.value,{env:c,dynamic_scope:o,error:u})}else{return d(r(n.value),function(n){return new M(new L("unquote"),new M(n,P))})}}return f(n,r,t)}return d(h(n.car),function(n){return d(r(n),dn)})}),"(quasiquote list ,value ,@value)\n\n            Similar macro to `quote` but inside it you can use special\n            expressions unquote abbreviated to , that will evaluate expresion inside\n            and return its value or unquote-splicing abbreviated to ,@ that will\n            evaluate expression but return value without parenthesis (it will join)\n            the list with its value. Best used with macros but it can be used outside"),clone:v(function(n){return n.clone()},"(clone list)\n\n            Function return clone of the list."),append:v(function(n,e){return this.get("append!")(n.clone(),e)},"(append list item)\n\n            Function will create new list with value appended to the end. It return\n            New list."),"append!":v(function(n,e){if(G(e)||H(e)){return n}return n.append(e)},"(append! name expression)\n\n             Destructive version of append, it modify the list in place. It return\n             original list."),reverse:v(function(n){if(n instanceof M){var e=this.get("list->array")(n).reverse();return this.get("array->list")(e)}else if(!(n instanceof Array)){throw new Error(wn("reverse",xn(n),"array or pair"))}else{return n.reverse()}},"(reverse list)\n\n            Function will reverse the list or array. If value is not a list\n            or array it will throw exception."),nth:v(function(n,e){if(e instanceof M){var t=e;var r=0;while(r<n){if(!t.cdr||t.cdr===P||t.haveCycles("cdr")){return P}t=t.cdr;r++}return t.car}else if(e instanceof Array){return e[n]}else{throw new Error(wn("nth",xn(e),"array or pair",2))}},"(nth index obj)\n\n            Function return nth element of the list or array. If used with different\n            value it will throw exception"),list:v(function(){return M.fromArray([].slice.call(arguments))},"(list . args)\n\n            Function create new list out of its arguments."),substring:v(function(n,e,t){return n.substring(e.valueOf(),t&&t.valueOf())},"(substring string start end)\n\n            Function return part of the string starting at start ending with end."),concat:v(function(){return[].join.call(arguments,"")},"(concat . strings)\n\n            Function create new string by joining its arguments"),join:v(function(n,e){return this.get("list->array")(e).join(n)},"(join separator list)\n\n            Function return string by joining elements of the list"),split:v(function(n,e){return this.get("array->list")(e.split(n))},"(split separator string)\n\n            Function create list by splitting string by separatar that can\n            be a string or regular expression."),replace:v(function(n,e,t){return t.replace(n,e)},"(replace pattern replacement string)\n\n            Function change patter to replacement inside string."),match:v(function(n,e){var t=e.match(n);return t?this.get("array->list")(t):P},"(match pattern string)\n\n            function return match object from JavaScript as list."),search:v(function(n,e){return e.search(n)},"(search pattern string)\n\n            Function return first found index of the pattern inside a string"),string:v(function e(n,t){if(typeof jQuery!=="undefined"&&n instanceof jQuery.fn.init){return"<#jQuery("+n.length+")>"}if(n instanceof ln){return n.value.toString()}if(typeof n==="undefined"){return"<#undefined>"}if(typeof n==="function"){if(K(n)){return"<#function(native)>"}return"<#function>"}if(n===P){return"nil"}if(n instanceof Array){return"["+n.map(function(n){return e(n,true)}).join(", ")+"]"}if(n===null||typeof n==="string"&&t){return JSON.stringify(n)}if(n instanceof M){return new In.Formatter(n.toString()).break().format()}if(n instanceof L){return n.toString()}if(c.HTMLElement&&n instanceof c.HTMLElement){return"<#HTMLElement(".concat(n.tagName.toLowerCase(),")>")}if(Tn(n)==="object"){var r=n.constructor.name;if(r!==""){return"<#"+r+">"}return"<#Object>"}if(typeof n!=="string"){return n.toString()}return n},"(string obj)\n\n            Function return string LIPS representation of an object as string."),env:v(function(n){n=n||this;var e=Object.keys(n.env);var t;if(e.length){t=M.fromArray(e)}else{t=P}if(n.parent!==g){return this.get("env").call(this,n.parent).append(t)}return t},"(env obj)\n\n            Function return list values (functions and variables) inside environment."),new:v(function(n){for(var e=arguments.length,t=new Array(e>1?e-1:0),r=1;r<e;r++){t[r-1]=arguments[r]}return Pn(n,t)},"(new obj . args)\n\n            Function create new JavaScript instance of an object."),get:fn,".":fn,unbind:v(z,"(unbind fn)\n\n             Function remove bidning from function so you can get props from it."),type:v(xn,"(type object)\n\n             Function return type of an object as string."),instanceof:v(function(n,e){return e instanceof n},"(instanceof type obj)\n\n            Function check of object is instance of object."),"function?":v(function(n){return typeof n==="function"},"(function? expression)\n\n            Function check if value is a function."),"number?":v(ln.isNumber,"(number? expression)\n\n             Function check if value is a number"),"string?":v(function(n){return typeof n==="string"},"(string? expression)\n\n            Function check if value is a string."),"pair?":v(function(n){return n instanceof M},"(pair? expression)\n\n            Function check if value is a pair or list structure."),"regex?":v(function(n){return n instanceof RegExp},"(regex? expression)\n\n            Function check if value is regular expression."),"null?":v(function(n){return G(n)||n instanceof M&&n.isEmptyList()},"(null? expression)\n\n            Function check if value is nulish."),"boolean?":v(function(n){return typeof n==="boolean"},"(boolean? expression)\n\n            Function check if value is boolean."),"symbol?":v(function(n){return n instanceof L},"(symbol? expression)\n\n            Function check if value is LIPS symbol"),"array?":v(function(n){return n instanceof Array},"(array? expression)\n\n            Function check if value is an arrray."),"object?":v(function(n){return n!==null&&Tn(n)==="object"&&!(n instanceof Array)},"(object? expression)\n\n            Function check if value is an object."),read:v(function e(n){var t=this;if(typeof n==="string"){n=p(b(n));if(n.length){return n[n.length-1]}return B()}return this.get("stdin").read().then(function(n){return e.call(t,n)})},"(read [string])\n\n            Function if used with string will parse the string and return\n            list structure of LIPS code. If called without an argument it\n            will read string from standard input (using browser prompt or\n            user defined way) and call itself with that string (parse is)\n            function can be used together with eval to evaluate code from\n            string"),print:v(function(){var n,e=this;for(var t=arguments.length,r=new Array(t),i=0;i<t;i++){r[i]=arguments[i]}(n=this.get("stdout")).write.apply(n,Cn(r.map(function(n){return e.get("string")(n)})))},"(print . args)\n\n            Function convert each argument to string and print the result to\n            standard output (by default it's console but it can be defined\n            it user code)"),error:v(function(){if(c.console){if(c.console.error){var n;(n=c.console).error.apply(n,arguments)}else if(c.console.log){var e;(e=c.console).log.apply(e,arguments)}}},"(error . args)\n\n            Display error message."),flatten:v(function(n){return n.flatten()},"(flatten list)\n\n            Return shallow list from tree structure (pairs)."),"array->list":v(function(n){return M.fromArray(n)},"(array->list array)\n\n            Function convert JavaScript array to LIPS list."),"list->array":v(function(n){if(n instanceof M&&n.isEmptyList()){return[]}var e=[];var t=n;while(true){if(t instanceof M){if(t.haveCycles("cdr")){break}e.push(t.car);t=t.cdr}else{break}}return e},"(list->array list)\n\n            Function convert LIPS list into JavaScript array."),apply:v(function(n,e){_n("call",n,"function",1);_n("call",e,"pair",2);return n.apply(void 0,Cn(this.get("list->array")(e)))},"(apply fn args)\n\n            Function that call function with list of arguments."),length:v(function(n){if(!n){return ln(0)}if(n instanceof M){return ln(n.length())}if("length"in n){return ln(n.length)}},"(length expression)\n\n            Function return length of the object, the object can be list\n            or any object that have length property."),try:v(new J("try",function(a,n){var o=this;var u=n.dynamic_scope,c=n.error;return new Promise(function(i){var n={env:o,error:function n(e){var t=o.inherit("try");t.set(a.cdr.car.cdr.car.car,e);var r={env:t,error:c};if(u){r.dynamic_scope=o}d(Fn(new M(new L("begin"),a.cdr.car.cdr.cdr),r),function(n){i(n)})}};if(u){n.dynamic_scope=o}d(Fn(a.car,n),i).catch(n.error)})}),"(try expr (catch (e) code)"),find:v(function e(t,r){if(G(r)){return P}var n=s("find",t);return d(n(r.car),function(n){if(n){return r.car}return e(t,r.cdr)})},"(Find fn list)\n\n            Higher order Function find first value for which function\n            return true."),"for-each":v(function(n){_n("for-each",n,"function");for(var e=arguments.length,t=new Array(e>1?e-1:0),r=1;r<e;r++){t[r-1]=arguments[r]}var i=this.get("map").apply(void 0,[n].concat(t));if(Y(i)){return i.then(function(){})}},"(for-each fn . args)\n\n            Higher order function that call function `fn` by for each\n            value of the argument. If you provide more then one list as argument\n            it will take each value from each list and call `fn` function\n            with that many argument as number of list arguments."),map:v(function n(t){var r=this;for(var e=arguments.length,i=new Array(e>1?e-1:0),a=1;a<e;a++){i[a-1]=arguments[a]}_n("map",t,"function");if(i.some(function(n){return H(n)})){return P}return d(t.call.apply(t,[this].concat(Cn(i.map(function(n){return n.car})))),function(e){return d(n.call.apply(n,[r,t].concat(Cn(i.map(function(n){return n.cdr})))),function(n){return new M(e,n)})})},"(map fn . lists)\n\n            Higher order function that call function `fn` by for each\n            value of the argument. If you provide more then one list as argument\n            it will take each value from each list and call `fn` function\n            with that many argument as number of list arguments. The return\n            values of the function call is acumulated in result list and\n            returned by the call to map."),some:v(function e(t,r){if(G(r)){return false}else{return d(t(r.car),function(n){return n||e(t,r.cdr)})}},"(some fn list)\n\n            Higher order function that call argument on each element of the list.\n            It stops when function fn return true for a value if so it will\n            return true. If it don't find the value it will return false"),fold:v(tn("fold",function(n,e,t){for(var r=arguments.length,i=new Array(r>3?r-3:0),a=3;a<r;a++){i[a-3]=arguments[a]}if(i.some(H)){return t}var o=n.call.apply(n,[this,e,t].concat(Cn(i.map(function(n){return n.cdr}))));return d(o,function(n){return e.apply(void 0,Cn(i.map(function(n){return n.car})).concat([n]))})}),"(fold fn init . lists)\n\n             Function fold is reverse of the reduce. it call function `fn`\n             on each elements on the list and return single value.\n             e.g. it call (fn a1 b1 (fn a2 b2 (fn a3 b3 '())))\n             for: (fold fn '() alist blist"),reduce:v(tn("reduce",function(e,t,n){var r=this;for(var i=arguments.length,a=new Array(i>3?i-3:0),o=3;o<i;o++){a[o-3]=arguments[o]}if(a.some(H)){return n}return d(t.apply(void 0,Cn(a.map(function(n){return n.car})).concat([n])),function(n){return e.call.apply(e,[r,t,n].concat(Cn(a.map(function(n){return n.cdr}))))})}),"(reduce fn init list . lists)\n\n             Higher order function take each element of the list and call\n             the function with result of previous call or init and next element\n             on the list until each element is processed and return single value\n             as result of last call to `fn` function.\n             e.g. it call (fn a3 b3 (fn a2 b2 (fn a1 b1 init)))\n             for (reduce fn init alist blist"),filter:v(function(n,e){var i=this.get("list->array")(e);var a=[];var o=s("filter",n);return function e(t){function n(n){if(n){a.push(r)}return e(++t)}if(t===i.length){return M.fromArray(a)}var r=i[t];return d(o(r,t),n)}(0)},"(filter fn list)\n\n            Higher order function that call `fn` for each element of the list\n            and return list for only those elements for which funtion return\n            true value."),range:v(function(n){if(n instanceof ln){n=n.valueOf()}return M.fromArray(new Array(n).fill(0).map(function(n,e){return ln(e)}))},"(range n)\n\n            Function return list of n numbers from 0 to n - 1"),compose:v(en,"(compose . fns)\n\n             Higher order function and create new function that apply all functions\n             From right to left and return it's value. Reverse of compose.\n             e.g.:\n             ((compose (curry + 2) (curry * 3)) 3)\n             11\n            "),pipe:v(nn,"(pipe . fns)\n\n             Higher order function and create new function that apply all functions\n             From left to right and return it's value. Reverse of compose.\n             e.g.:\n             ((pipe (curry + 2) (curry * 3)) 3)\n             15"),curry:v(cn,"(curry fn . args)\n\n             Higher order function that create curried version of the function.\n             The result function will have parially applied arguments and it\n             will keep returning functions until all arguments are added\n\n             e.g.:\n             (define (add a b c d) (+ a b c d))\n             (define add1 (curry add 1))\n             (define add12 (add 2))\n             (print (add12 3 4))"),odd:v(an(function(n){return ln(n).isOdd()}),"(odd number)\n             Function check if number os odd."),even:v(an(function(n){return ln(n).isEvent()}),"(even number)\n\n             Function check if number is even."),"*":v(un(function(n,e){return ln(n).mul(e)}),"(* . numbers)\n\n             Multiplicate all numbers passed as arguments. If single value is passed\n              it will return that value."),"+":v(un(function(n,e){return ln(n).add(e)}),"(+ . numbers)\n\n             Sum all numbers passed as arguments. If single value is passed it will\n             return that value."),"-":v(function(){for(var n=arguments.length,e=new Array(n),t=0;t<n;t++){e[t]=arguments[t]}if(e.length===1){return ln(e[0]).neg()}if(e.length){return e.reduce(on(function(n,e){return ln(n).sub(e)}))}},"(- . numbers)\n            (- number)\n\n            Substract number passed as argument. If only one argument is passed\n            it will negate the value."),"/":v(un(function(n,e){return ln(n).div(e)}),"(/ . numbers)\n\n             Divide number passed as arguments one by one. If single argument\n             is passed it will return that value."),abs:v(an(function(n){return ln(n).abs()}),"(abs number)\n\n             Function create absolute value from number."),sqrt:v(an(function(n){return Math.sqrt(n)}),"(sqrt number)\n\n             Function return square root of the number."),"**":v(on(function(n,e){return ln(n).pow(e)}),"(** a b)\n\n            Function calculate number a to to the power of b. It can throw\n            exception when ** native operator is not supported."),"1+":v(an(function(n){return ln(n).add(1)}),"(1+ number)\n\n             Function add 1 to the number and return result."),"1-":v(an(function(n){return ln(n).sub(1)}),"(1- number)\n\n             Function substract 1 from the number and return result."),"++":v(new J("++",function(n){_n("++",n.car,"symbol");var e=this.get(n.car);var t=ln(e).add(1);this.set(n.car,t);return t}),"(++ variable)\n\n             Macro that work only on variables and increment the value by one."),"--":v(new J("--",function(n){_n("--",n.car,"symbol");var e=this.get(n.car);var t=ln(e).sub(1);this.set(n.car,t);return t}),"(-- variable)\n\n             Macro that decrement the value it work only on symbols"),"%":v(un(function(n,e){return ln(n).mod(e)}),"(% . numbers)\n\n             Function use modulo operation on each of the numbers. It return\n             single number."),"==":v(function(n,e){return ln(n).cmp(e)===0},"(== a b)\n\n            Function compare two numbers and check if they are equal."),">":v(function(n,e){return ln(n).cmp(e)===1},"(> a b)\n\n            Function compare two numbers and check if first argument is greater\n            than the second one"),"<":v(function(n,e){return ln(n).cmp(e)===-1},"(< a b)\n\n            Function compare two numbers and check if first argument is less\n            than the second one"),"<=":v(function(n,e){return[0,-1].includes(ln(n).cmp(e))},"(<= a b)\n\n            Function compare two numbers and check if first argument is less or\n            equal to the second one"),">=":v(function(n,e){return[0,1].includes(ln(n).cmp(e))},"(>= a b)\n\n            Function compare two numbers and check if first argument is less or\n            equal to the second one"),"eq?":v(T,"(eq? a b)\n\n             Function compare two values if they are identical."),or:v(new J("or",function(n,e){var i=e.dynamic_scope,a=e.error;var o=this.get("list->array")(n);var u=this;if(i){i=u}var c;return function e(){function n(n){c=n;if(c){return c}else{return e()}}var t=o.shift();if(typeof t==="undefined"){if(c){return c}else{return false}}else{var r=Fn(t,{env:u,dynamic_scope:i,error:a});return d(r,n)}}()}),"(or . expressions)\n\n             Macro execute the values one by one and return the one that is truthy value.\n             If there are no expression that evaluate to true it return false."),and:v(new J("and",function(n){var e=arguments.length>1&&arguments[1]!==g?arguments[1]:{},i=e.dynamic_scope,a=e.error;var o=this.get("list->array")(n);var u=this;if(i){i=u}if(!o.length){return true}var c;return function e(){function n(n){c=n;if(!c){return false}else{return e()}}var t=o.shift();if(typeof t==="undefined"){if(c){return c}else{return false}}else{var r=Fn(t,{env:u,dynamic_scope:i,error:a});return d(r,n)}}()}),"(and . expressions)\n\n             Macro evalute each expression in sequence if any value return false it will\n             return false. If each value return true it will return the last value.\n             If it's called without arguments it will return true."),"|":v(function(n,e){return ln(n).or(e)},"(& a b)\n\n            Function calculate or bit operation."),"&":v(function(n,e){return ln(n).and(e)},"(& a b)\n\n            Function calculate and bit operation."),"~":v(function(n){return ln(n).neg()},"(~ number)\n\n            Function negate the value."),">>":v(function(n,e){return ln(n).shr(e)},"(>> a b)\n\n            Function right shit the value a by value b."),"<<":v(function(n,e){return ln(n).shl(e)},"(<< a b)\n\n            Function left shit the value a by value b."),not:v(function(n){if(H(n)){return true}return!n},"(not object)\n\n            Function return negation of the argument."),"->":v(function(n,e){for(var t=arguments.length,r=new Array(t>2?t-2:0),i=2;i<t;i++){r[i-2]=arguments[i]}return n[e].apply(n,r)},"(-> obj name . args)\n\n            Function get function from object and call it with arguments.")},g,"global");["floor","round","ceil"].forEach(function(e){mn.set(e,v(function(n){if(n instanceof ln){return n[e]()}throw new Error("".concat(Tn(n)," ").concat(n.toString()," is not a number"))},"(".concat(e," number)\n\n            Function calculate ").concat(e," of a number.")))});function gn(n){if(n.length===1){return n[0]}else{var e=[];var t=gn(n.slice(1));for(var r=0;r<t.length;r++){for(var i=0;i<n[0].length;i++){e.push(n[0][i]+t[r])}}return e}}function bn(n,e,t){var r=[];for(var i=e;i<=t;++i){var a=[];for(var o=0;o<i;++o){a.push(n)}r=r.concat(gn(a))}return r}bn(["d","a"],2,5).forEach(function(n){var e=n.split("");var t=e.slice().reverse();var r=e.map(function(n){return"(c".concat(n,"r")}).join(" ")+" arg"+")".repeat(e.length);var i="c"+n+"r";mn.set(i,v(function(n){return t.reduce(function(n,e){if(e==="a"){return n.car}else{return n.cdr}},n)},"(".concat(i," arg)\n\n            Function calculate ").concat(r)))});if(typeof global!=="undefined"){mn.set("global",global)}else if(typeof window!=="undefined"){mn.set("window",window)}function wn(n,e,t){var r=arguments.length>3&&arguments[3]!==g?arguments[3]:null;var i=n?" in function `".concat(n,"`"):"";if(r!==null){i+=" argument ".concat(r)}return"Expecting ".concat(t," got ").concat(e).concat(i)}function _n(n,e,t){var r=arguments.length>3&&arguments[3]!==g?arguments[3]:null;var i=xn(e);if(i!==t){throw new Error(wn(n,i,t,r))}}function xn(n){var e={pair:M,symbol:L,macro:J,array:Array,native_symbol:c.Symbol};if(n===P){return"nil"}if(n===null){return"null"}var t=Object.entries(e);for(var r=0;r<t.length;r++){var i=Rn(t[r],2),a=i[0],o=i[1];if(n instanceof o){return a}}if(n instanceof ln){return"number"}if(n instanceof RegExp){return"regex"}if(Tn(n)==="object"){return n.constructor.name}return Tn(n)}function kn(n){var e=[];t(n);if(e.length){return a(n)}return n;function t(n){if(Y(n)){e.push(n)}else if(n instanceof 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You can only get them\n             from body of let expression."),begin:v(new J("begin",function(n,e){var r=e.dynamic_scope,i=e.error;var a=this.get("list->array")(n);if(r){r=this}var o=this;var u;return function e(){if(a.length){var n=a.shift();var t=Fn(n,{env:o,dynamic_scope:r,error:i});return d(t,function(n){u=n;return e()})}else{return u}}()}),"(begin . args)\n\n             Macro runs list of expression and return valuate of the list one.\n             It can be used in place where you can only have single exression,\n             like if expression."),ignore:new J("ignore",function(n,e){var t=e.dynamic_scope,r=e.error;var i={env:this,error:r};if(t){i.dynamic_scope=this}Fn(n,i)},"(ignore expression)\n\n            Macro that will evaluate expression and swallow any promises that may\n            be created. It wil run and ignore any value that may be returned by\n            expression. The code should have side effects and/or when it's promise\n            it should resolve to undefined."),timer:v(new J("timer",function(e){var n=arguments.length>1&&arguments[1]!==g?arguments[1]:{},t=n.dynamic_scope,r=n.error;_n("timer",e.car,"number");var i=this;if(t){t=this}return new Promise(function(n){setTimeout(function(){n(Fn(e.cdr.car,{env:i,dynamic_scope:t,error:r}))},e.car)}).then(dn)}),"(timer time expression)\n\n             Function return a promise, and it will be automatically evaluated\n             after specific time passes. The return value of the function\n             will be value of the timer exprssion. If you want to do side effect\n             only expression you can wrap your expression in nol call."),define:v(J.defmacro("define",function(e,n){var t=this;if(e.car instanceof M&&e.car.car instanceof L){var r=new M(new L("define"),new M(e.car.car,new M(new M(new L("lambda"),new M(e.car.cdr,e.cdr)))));return r}else if(n.macro_expand){return}if(n.dynamic_scope){n.dynamic_scope=this}n.env=t;var i=e.cdr.car;if(i instanceof M){i=Fn(i,n)}else if(i instanceof L){i=t.get(i)}if(e.car instanceof L){d(i,function(n){t.set(e.car,n)})}}),"(define name expression)\n             (define (function-name . args) body)\n\n             Macro for defining values. It can be used to define variables,\n             or function. If first argument is list it will create function\n             with name beeing first element of the list. The macro evalute\n             code `(define function (lambda args body))`"),"set-obj!":v(function(n,e,t){if(Tn(n)!=="object"||G(n)){throw new Error(wn("set-obj!",xn(n),"object"))}n[e]=t},"(set-obj! obj key value)\n\n            Function set property of JavaScript object"),"current-environment":v(function(){return this},"(current-environment)\n\n            Function return current environement."),eval:v(function(n,t){var r=this;t=t||this;if(n instanceof L){return t.get(n)}if(n instanceof M){return Fn(n,{env:t,dynamic_scope:this,error:function n(e){return r.get("print")(e.message)}})}if(n instanceof Array){var i=this.get("eval");return n.reduce(function(n,e){return i(e,t)})}},"(eval list)\n\n            Function evalute LIPS code as list structure."),lambda:new J("lambda",function(s){var n=arguments.length>1&&arguments[1]!==g?arguments[1]:{},f=n.dynamic_scope,l=n.error;var h=this;var p;if(s.cdr instanceof M&&typeof s.cdr.car==="string"&&s.cdr.cdr!==P){p=s.cdr.car}function e(){var n=(f?this:h).inherit("lambda");var e=s.car;var t=0;var r;if(e instanceof L||!H(e)){for(var i=arguments.length,a=new Array(i),o=0;o<i;o++){a[o]=arguments[o]}while(true){if(e.car!==P){if(e instanceof L){r=M.fromArray(a.slice(t));n.env[e.name]=r;break}else{if(typeof a[t]==="undefined"){r=P}else{r=a[t]}n.env[e.car.name]=r}}if(e.cdr===P){break}t++;e=e.cdr}}if(f){f=n}var u=p?s.cdr.cdr:s.cdr;var c=new M(new L("begin"),u);return Fn(c,{env:n,dynamic_scope:f,error:l})}var t=s.car instanceof M?s.car.length():null;if(!(s.car instanceof M)){return v(e,p,true)}e.__code__=new M(new L("lambda"),s);return v(X(e,t),p,true)},"(lambda (a b) body)\n            (lambda args body)\n            (lambda (a b . rest) body)\n\n            Macro lambda create new anonymous function, if first element of the body\n            is string and there is more elements it will be documentation, that can\n            be read using (help fn)"),macroexpand:new J("macro-expand",D()),"macroexpand-1":new J("macro-expand",D(true)),"define-macro":v(new J($,function(c,n){var s=n.dynamic_scope,f=n.error;function l(n){if(n instanceof M){delete n.data}return n}if(c.car instanceof M&&c.car.car instanceof L){var e=c.car.car.name;var h;if(typeof c.cdr.car==="string"&&c.cdr.cdr!==P){h=c.cdr.car}this.env[e]=J.defmacro(e,function(n,e){var t=e.macro_expand;var r=new pn({},this,"defmacro");var i=c.car.cdr;var a=n;while(true){if(i===P){break}if(i instanceof L){r.env[i.name]=a;break}else if(i.car!==P&&a.car!==P){r.env[i.car.name]=a.car}if(i.cdr===P){break}a=a.cdr;i=i.cdr}if(s){s=r}if(c.cdr instanceof M){var o=h?c.cdr.cdr:c.cdr;var u=o.reduce(function(n,e){return Fn(e,{env:r,dynamic_scope:s,error:f})});if(t){return u}u=Fn(u,{env:this,dynamic_scope:s,error:f});return d(u,l)}},h)}}),"(define-macro (name . args) body)\n\n             Meta macro, macro that create new macros, if return value is list structure\n             it will be evaluated when macro is invoked. You can use quasiquote ` and\n             unquote , and unquote-splicing ,@ inside to create expression that will be\n             evaluated on runtime. Macros works like this: if you pass any expression to\n             macro the arguments will not be evaluated unless macro itself evaluate it.\n             Because of this macro can manipulate expression (arguments) as lists."),quote:v(new J("quote",function(n){return dn(n.car)}),"(quote expression)\n\n             Macro that return single lips expression as data (it don't evaluate its\n             argument). It will return list of pairs if put in front of lips code.\n             And if put in fron of symbol it will return that symbol not value\n             associated with that name."),"unquote-splicing":v(function(){throw new Error("You can't call `unquote-splicing` outside of quasiquote")},"(unquote-splicing code)\n\n            Special form to be used in quasiquote macro, parser is processing special\n            characters ,@ and create call to this pseudo function. It can be used\n            to evalute expression inside and return the value without parenthesis.\n            the value will be joined to the output list structure."),unquote:v(function(){throw new Error("You can't call `unquote` outside of quasiquote")},"(unquote code)\n\n            Special form to be used in quasiquote macro, parser is processing special\n            characters , and create call to this pseudo function. It can be used\n            to evalute expression inside and return the value, the output is inserted\n            into list structure created by queasiquote."),quasiquote:v(new J("quasiquote",function(n,e){var o=e.dynamic_scope,u=e.error;var c=this;var s=0;if(o){o=c}function a(n){return n instanceof M}function f(n,e){var t=arguments.length>2&&arguments[2]!==g?arguments[2]:a;if(n instanceof M&&!H(n)){var r=n.car;var i=n.cdr;if(t(r)){r=e(r)}if(t(i)){i=e(i)}if(Y(r)||Y(i)){return Promise.all([r,i]).then(function(n){var e=Rn(n,2),t=e[0],r=e[1];return new M(t,r)})}else{return new M(r,i)}}return n}function l(n,e){if(n instanceof M){if(H(n)&&e===P){return P}n.append(e)}else{n=new M(n,e)}return n}function h(t){if(t instanceof M&&!H(t)){var n;if(L.is(t.car.car,"unquote-splicing")){n=Fn(t.car.cdr.car,{env:c,dynamic_scope:o,error:u});return d(n,function(e){if(!e instanceof M){throw new Error("Value of unquote-splicing need"+" to be pair")}var n=h(t.cdr);if(n===P&&e===P){return g}return d(n,function(n){return l(e,n)})})}if(L.is(t.car,"unquote")){var e=t.cdr;var r=e;var i=r;var a=1;while(L.is(r.car.car,"unquote")){i=r;a++;r=r.car.cdr.car}if(a>s){s=a}if(i===r){if(t.cdr.cdr!==P){return d(h(t.cdr.cdr),function(n){return new M(new vn(t.cdr.car,a),n)})}else{return new vn(t.cdr.car,a)}}else if(i.cdr.cdr!==P){return d(h(i.cdr.cdr),function(n){i.car.cdr=new M(new vn(r,a),i.cdr===P?P:n);return e.car})}else{i.car.cdr=new vn(r,a)}return e.car}return f(t,h)}return t}var t=function n(e){return a(e)||e instanceof vn};function r(n){if(n instanceof vn){if(s===n.count){return Fn(n.value,{env:c,dynamic_scope:o,error:u})}else{return d(r(n.value),function(n){return new M(new L("unquote"),new M(n,P))})}}return f(n,r,t)}return d(h(n.car),function(n){return d(r(n),dn)})}),"(quasiquote list ,value ,@value)\n\n            Similar macro to `quote` but inside it you can use special\n            expressions unquote abbreviated to , that will evaluate expresion inside\n            and return its value or unquote-splicing abbreviated to ,@ that will\n            evaluate expression but return value without parenthesis (it will join)\n            the list with its value. Best used with macros but it can be used outside"),clone:v(function(n){return n.clone()},"(clone list)\n\n            Function return clone of the list."),append:v(function(n,e){return this.get("append!")(n.clone(),e)},"(append list item)\n\n            Function will create new list with value appended to the end. It return\n            New list."),"append!":v(function(n,e){if(G(e)||H(e)){return n}return n.append(e)},"(append! name expression)\n\n             Destructive version of append, it modify the list in place. It return\n             original list."),reverse:v(function(n){if(n instanceof M){var e=this.get("list->array")(n).reverse();return this.get("array->list")(e)}else if(!(n instanceof Array)){throw new Error(wn("reverse",xn(n),"array or pair"))}else{return n.reverse()}},"(reverse list)\n\n            Function will reverse the list or array. If value is not a list\n            or array it will throw exception."),nth:v(function(n,e){if(e instanceof M){var t=e;var r=0;while(r<n){if(!t.cdr||t.cdr===P||t.haveCycles("cdr")){return P}t=t.cdr;r++}return t.car}else if(e instanceof Array){return e[n]}else{throw new Error(wn("nth",xn(e),"array or pair",2))}},"(nth index obj)\n\n            Function return nth element of the list or array. If used with different\n            value it will throw exception"),list:v(function(){return M.fromArray([].slice.call(arguments))},"(list . args)\n\n            Function create new list out of its arguments."),substring:v(function(n,e,t){return n.substring(e.valueOf(),t&&t.valueOf())},"(substring string start end)\n\n            Function return part of the string starting at start ending with end."),concat:v(function(){return[].join.call(arguments,"")},"(concat . strings)\n\n            Function create new string by joining its arguments"),join:v(function(n,e){return this.get("list->array")(e).join(n)},"(join separator list)\n\n            Function return string by joining elements of the list"),split:v(function(n,e){return this.get("array->list")(e.split(n))},"(split separator string)\n\n            Function create list by splitting string by separatar that can\n            be a string or regular expression."),replace:v(function(n,e,t){return t.replace(n,e)},"(replace pattern replacement string)\n\n            Function change patter to replacement inside string."),match:v(function(n,e){var t=e.match(n);return t?this.get("array->list")(t):P},"(match pattern string)\n\n            function return match object from JavaScript as list."),search:v(function(n,e){return e.search(n)},"(search pattern string)\n\n            Function return first found index of the pattern inside a string"),string:v(function e(n,t){if(typeof jQuery!=="undefined"&&n instanceof jQuery.fn.init){return"<#jQuery("+n.length+")>"}if(n instanceof ln){return n.value.toString()}if(typeof n==="undefined"){return"<#undefined>"}if(typeof n==="function"){if(K(n)){return"<#function(native)>"}return"<#function>"}if(n===P){return"nil"}if(n instanceof Array){return"["+n.map(function(n){return e(n,true)}).join(", ")+"]"}if(n===null||typeof n==="string"&&t){return JSON.stringify(n)}if(n instanceof M){return new In.Formatter(n.toString()).break().format()}if(n instanceof L){return n.toString()}if(c.HTMLElement&&n instanceof c.HTMLElement){return"<#HTMLElement(".concat(n.tagName.toLowerCase(),")>")}if(Tn(n)==="object"){var r=n.constructor.name;if(r!==""){return"<#"+r+">"}return"<#Object>"}if(typeof n!=="string"){return n.toString()}return n},"(string obj)\n\n            Function return string LIPS representation of an object as string."),env:v(function(n){n=n||this;var e=Object.keys(n.env);var t;if(e.length){t=M.fromArray(e)}else{t=P}if(n.parent!==g){return this.get("env").call(this,n.parent).append(t)}return t},"(env obj)\n\n            Function return list values (functions and variables) inside environment."),new:v(function(n){for(var e=arguments.length,t=new Array(e>1?e-1:0),r=1;r<e;r++){t[r-1]=arguments[r]}return Pn(n,t)},"(new obj . args)\n\n            Function create new JavaScript instance of an object."),get:fn,".":fn,unbind:v(z,"(unbind fn)\n\n             Function remove bidning from function so you can get props from it."),type:v(xn,"(type object)\n\n             Function return type of an object as string."),instanceof:v(function(n,e){return e instanceof n},"(instanceof type obj)\n\n            Function check of object is instance of object."),"function?":v(function(n){return typeof n==="function"},"(function? expression)\n\n            Function check if value is a function."),"number?":v(ln.isNumber,"(number? expression)\n\n             Function check if value is a number"),"string?":v(function(n){return typeof n==="string"},"(string? expression)\n\n            Function check if value is a string."),"pair?":v(function(n){return n instanceof M},"(pair? expression)\n\n            Function check if value is a pair or list structure."),"regex?":v(function(n){return n instanceof RegExp},"(regex? expression)\n\n            Function check if value is regular expression."),"null?":v(function(n){return G(n)||n instanceof M&&n.isEmptyList()},"(null? expression)\n\n            Function check if value is nulish."),"boolean?":v(function(n){return typeof n==="boolean"},"(boolean? expression)\n\n            Function check if value is boolean."),"symbol?":v(function(n){return n instanceof L},"(symbol? expression)\n\n            Function check if value is LIPS symbol"),"array?":v(function(n){return n instanceof Array},"(array? expression)\n\n            Function check if value is an arrray."),"object?":v(function(n){return n!==null&&Tn(n)==="object"&&!(n instanceof Array)},"(object? expression)\n\n            Function check if value is an object."),read:v(function e(n){var t=this;if(typeof n==="string"){n=p(b(n));if(n.length){return n[n.length-1]}return B()}return this.get("stdin").read().then(function(n){return e.call(t,n)})},"(read [string])\n\n            Function if used with string will parse the string and return\n            list structure of LIPS code. If called without an argument it\n            will read string from standard input (using browser prompt or\n            user defined way) and call itself with that string (parse is)\n            function can be used together with eval to evaluate code from\n            string"),print:v(function(){var n,e=this;for(var t=arguments.length,r=new Array(t),i=0;i<t;i++){r[i]=arguments[i]}(n=this.get("stdout")).write.apply(n,Cn(r.map(function(n){return e.get("string")(n)})))},"(print . args)\n\n            Function convert each argument to string and print the result to\n            standard output (by default it's console but it can be defined\n            it user code)"),error:v(function(){if(c.console){if(c.console.error){var n;(n=c.console).error.apply(n,arguments)}else if(c.console.log){var e;(e=c.console).log.apply(e,arguments)}}},"(error . args)\n\n            Display error message."),flatten:v(function(n){return n.flatten()},"(flatten list)\n\n            Return shallow list from tree structure (pairs)."),"array->list":v(function(n){return M.fromArray(n)},"(array->list array)\n\n            Function convert JavaScript array to LIPS list."),"list->array":v(function(n){if(n instanceof M&&n.isEmptyList()){return[]}var e=[];var t=n;while(true){if(t instanceof M){if(t.haveCycles("cdr")){break}e.push(t.car);t=t.cdr}else{break}}return e},"(list->array list)\n\n            Function convert LIPS list into JavaScript array."),apply:v(function(n,e){_n("call",n,"function",1);_n("call",e,"pair",2);return n.apply(void 0,Cn(this.get("list->array")(e)))},"(apply fn args)\n\n            Function that call function with list of arguments."),length:v(function(n){if(!n){return ln(0)}if(n instanceof M){return ln(n.length())}if("length"in n){return ln(n.length)}},"(length expression)\n\n            Function return length of the object, the object can be list\n            or any object that have length property."),try:v(new J("try",function(a,n){var o=this;var u=n.dynamic_scope,c=n.error;return new Promise(function(i){var n={env:o,error:function n(e){var t=o.inherit("try");t.set(a.cdr.car.cdr.car.car,e);var r={env:t,error:c};if(u){r.dynamic_scope=o}d(Fn(new M(new L("begin"),a.cdr.car.cdr.cdr),r),function(n){i(n)})}};if(u){n.dynamic_scope=o}d(Fn(a.car,n),i).catch(n.error)})}),"(try expr (catch (e) code)"),find:v(function e(t,r){if(G(r)){return P}var n=s("find",t);return d(n(r.car),function(n){if(n){return r.car}return e(t,r.cdr)})},"(Find fn list)\n\n            Higher order Function find first value for which function\n            return true."),"for-each":v(function(n){_n("for-each",n,"function");for(var e=arguments.length,t=new Array(e>1?e-1:0),r=1;r<e;r++){t[r-1]=arguments[r]}var i=this.get("map").apply(void 0,[n].concat(t));if(Y(i)){return i.then(function(){})}},"(for-each fn . args)\n\n            Higher order function that call function `fn` by for each\n            value of the argument. If you provide more then one list as argument\n            it will take each value from each list and call `fn` function\n            with that many argument as number of list arguments."),map:v(function n(t){var r=this;for(var e=arguments.length,i=new Array(e>1?e-1:0),a=1;a<e;a++){i[a-1]=arguments[a]}_n("map",t,"function");if(i.some(function(n){return H(n)})){return P}return d(t.call.apply(t,[this].concat(Cn(i.map(function(n){return n.car})))),function(e){return d(n.call.apply(n,[r,t].concat(Cn(i.map(function(n){return n.cdr})))),function(n){return new M(e,n)})})},"(map fn . lists)\n\n            Higher order function that call function `fn` by for each\n            value of the argument. If you provide more then one list as argument\n            it will take each value from each list and call `fn` function\n            with that many argument as number of list arguments. The return\n            values of the function call is acumulated in result list and\n            returned by the call to map."),some:v(function e(t,r){if(G(r)){return false}else{return d(t(r.car),function(n){return n||e(t,r.cdr)})}},"(some fn list)\n\n            Higher order function that call argument on each element of the list.\n            It stops when function fn return true for a value if so it will\n            return true. If it don't find the value it will return false"),fold:v(tn("fold",function(n,e,t){for(var r=arguments.length,i=new Array(r>3?r-3:0),a=3;a<r;a++){i[a-3]=arguments[a]}if(i.some(H)){return t}var o=n.call.apply(n,[this,e,t].concat(Cn(i.map(function(n){return n.cdr}))));return d(o,function(n){return e.apply(void 0,Cn(i.map(function(n){return n.car})).concat([n]))})}),"(fold fn init . lists)\n\n             Function fold is reverse of the reduce. it call function `fn`\n             on each elements on the list and return single value.\n             e.g. it call (fn a1 b1 (fn a2 b2 (fn a3 b3 '())))\n             for: (fold fn '() alist blist"),reduce:v(tn("reduce",function(e,t,n){var r=this;for(var i=arguments.length,a=new Array(i>3?i-3:0),o=3;o<i;o++){a[o-3]=arguments[o]}if(a.some(H)){return n}return d(t.apply(void 0,Cn(a.map(function(n){return n.car})).concat([n])),function(n){return e.call.apply(e,[r,t,n].concat(Cn(a.map(function(n){return n.cdr}))))})}),"(reduce fn init list . lists)\n\n             Higher order function take each element of the list and call\n             the function with result of previous call or init and next element\n             on the list until each element is processed and return single value\n             as result of last call to `fn` function.\n             e.g. it call (fn a3 b3 (fn a2 b2 (fn a1 b1 init)))\n             for (reduce fn init alist blist"),filter:v(function(n,e){var i=this.get("list->array")(e);var a=[];var o=s("filter",n);return function e(t){function n(n){if(n){a.push(r)}return e(++t)}if(t===i.length){return M.fromArray(a)}var r=i[t];return d(o(r,t),n)}(0)},"(filter fn list)\n\n            Higher order function that call `fn` for each element of the list\n            and return list for only those elements for which funtion return\n            true value."),range:v(function(n){if(n instanceof ln){n=n.valueOf()}return M.fromArray(new Array(n).fill(0).map(function(n,e){return ln(e)}))},"(range n)\n\n            Function return list of n numbers from 0 to n - 1"),compose:v(en,"(compose . fns)\n\n             Higher order function and create new function that apply all functions\n             From right to left and return it's value. Reverse of compose.\n             e.g.:\n             ((compose (curry + 2) (curry * 3)) 3)\n             11\n            "),pipe:v(nn,"(pipe . fns)\n\n             Higher order function and create new function that apply all functions\n             From left to right and return it's value. Reverse of compose.\n             e.g.:\n             ((pipe (curry + 2) (curry * 3)) 3)\n             15"),curry:v(cn,"(curry fn . args)\n\n             Higher order function that create curried version of the function.\n             The result function will have parially applied arguments and it\n             will keep returning functions until all arguments are added\n\n             e.g.:\n             (define (add a b c d) (+ a b c d))\n             (define add1 (curry add 1))\n             (define add12 (add 2))\n             (print (add12 3 4))"),odd:v(an(function(n){return ln(n).isOdd()}),"(odd number)\n             Function check if number os odd."),even:v(an(function(n){return ln(n).isEvent()}),"(even number)\n\n             Function check if number is even."),"*":v(un(function(n,e){return ln(n).mul(e)}),"(* . numbers)\n\n             Multiplicate all numbers passed as arguments. If single value is passed\n              it will return that value."),"+":v(un(function(n,e){return ln(n).add(e)}),"(+ . numbers)\n\n             Sum all numbers passed as arguments. If single value is passed it will\n             return that value."),"-":v(function(){for(var n=arguments.length,e=new Array(n),t=0;t<n;t++){e[t]=arguments[t]}if(e.length===1){return ln(e[0]).neg()}if(e.length){return e.reduce(on(function(n,e){return ln(n).sub(e)}))}},"(- . numbers)\n            (- number)\n\n            Substract number passed as argument. If only one argument is passed\n            it will negate the value."),"/":v(un(function(n,e){return ln(n).div(e)}),"(/ . numbers)\n\n             Divide number passed as arguments one by one. If single argument\n             is passed it will return that value."),abs:v(an(function(n){return ln(n).abs()}),"(abs number)\n\n             Function create absolute value from number."),sqrt:v(an(function(n){return Math.sqrt(n)}),"(sqrt number)\n\n             Function return square root of the number."),"**":v(on(function(n,e){return ln(n).pow(e)}),"(** a b)\n\n            Function calculate number a to to the power of b. It can throw\n            exception when ** native operator is not supported."),"1+":v(an(function(n){return ln(n).add(1)}),"(1+ number)\n\n             Function add 1 to the number and return result."),"1-":v(an(function(n){return ln(n).sub(1)}),"(1- number)\n\n             Function substract 1 from the number and return result."),"++":v(new J("++",function(n){_n("++",n.car,"symbol");var e=this.get(n.car);var t=ln(e).add(1);this.set(n.car,t);return t}),"(++ variable)\n\n             Macro that work only on variables and increment the value by one."),"--":v(new J("--",function(n){_n("--",n.car,"symbol");var e=this.get(n.car);var t=ln(e).sub(1);this.set(n.car,t);return t}),"(-- variable)\n\n             Macro that decrement the value it work only on symbols"),"%":v(un(function(n,e){return ln(n).mod(e)}),"(% . numbers)\n\n             Function use modulo operation on each of the numbers. It return\n             single number."),"==":v(function(n,e){return ln(n).cmp(e)===0},"(== a b)\n\n            Function compare two numbers and check if they are equal."),">":v(function(n,e){return ln(n).cmp(e)===1},"(> a b)\n\n            Function compare two numbers and check if first argument is greater\n            than the second one"),"<":v(function(n,e){return ln(n).cmp(e)===-1},"(< a b)\n\n            Function compare two numbers and check if first argument is less\n            than the second one"),"<=":v(function(n,e){return[0,-1].includes(ln(n).cmp(e))},"(<= a b)\n\n            Function compare two numbers and check if first argument is less or\n            equal to the second one"),">=":v(function(n,e){return[0,1].includes(ln(n).cmp(e))},"(>= a b)\n\n            Function compare two numbers and check if first argument is less or\n            equal to the second one"),"eq?":v(T,"(eq? a b)\n\n             Function compare two values if they are identical."),or:v(new J("or",function(n,e){var i=e.dynamic_scope,a=e.error;var o=this.get("list->array")(n);var u=this;if(i){i=u}var c;return function e(){function n(n){c=n;if(c){return c}else{return e()}}var t=o.shift();if(typeof t==="undefined"){if(c){return c}else{return false}}else{var r=Fn(t,{env:u,dynamic_scope:i,error:a});return d(r,n)}}()}),"(or . expressions)\n\n             Macro execute the values one by one and return the one that is truthy value.\n             If there are no expression that evaluate to true it return false."),and:v(new J("and",function(n){var e=arguments.length>1&&arguments[1]!==g?arguments[1]:{},i=e.dynamic_scope,a=e.error;var o=this.get("list->array")(n);var u=this;if(i){i=u}if(!o.length){return true}var c;return function e(){function n(n){c=n;if(!c){return false}else{return e()}}var t=o.shift();if(typeof t==="undefined"){if(c){return c}else{return false}}else{var r=Fn(t,{env:u,dynamic_scope:i,error:a});return d(r,n)}}()}),"(and . expressions)\n\n             Macro evalute each expression in sequence if any value return false it will\n             return false. If each value return true it will return the last value.\n             If it's called without arguments it will return true."),"|":v(function(n,e){return ln(n).or(e)},"(& a b)\n\n            Function calculate or bit operation."),"&":v(function(n,e){return ln(n).and(e)},"(& a b)\n\n            Function calculate and bit operation."),"~":v(function(n){return ln(n).neg()},"(~ number)\n\n            Function negate the value."),">>":v(function(n,e){return ln(n).shr(e)},"(>> a b)\n\n            Function right shit the value a by value b."),"<<":v(function(n,e){return ln(n).shl(e)},"(<< a b)\n\n            Function left shit the value a by value b."),not:v(function(n){if(H(n)){return true}return!n},"(not object)\n\n            Function return negation of the argument."),"->":v(function(n,e){for(var t=arguments.length,r=new Array(t>2?t-2:0),i=2;i<t;i++){r[i-2]=arguments[i]}return n[e].apply(n,r)},"(-> obj name . args)\n\n            Function get function from object and call it with arguments.")},g,"global");["floor","round","ceil"].forEach(function(e){mn.set(e,v(function(n){if(n instanceof ln){return n[e]()}throw new Error("".concat(Tn(n)," ").concat(n.toString()," is not a number"))},"(".concat(e," number)\n\n            Function calculate ").concat(e," of a number.")))});function gn(n){if(n.length===1){return n[0]}else{var e=[];var t=gn(n.slice(1));for(var r=0;r<t.length;r++){for(var i=0;i<n[0].length;i++){e.push(n[0][i]+t[r])}}return e}}function bn(n,e,t){var r=[];for(var i=e;i<=t;++i){var a=[];for(var o=0;o<i;++o){a.push(n)}r=r.concat(gn(a))}return r}bn(["d","a"],2,5).forEach(function(n){var e=n.split("");var t=e.slice().reverse();var r=e.map(function(n){return"(c".concat(n,"r")}).join(" ")+" arg"+")".repeat(e.length);var i="c"+n+"r";mn.set(i,v(function(n){return t.reduce(function(n,e){if(n===P){return P}_n(i,n,"pair");if(e==="a"){return n.car}else{return n.cdr}},n)},"(".concat(i," arg)\n\n            Function calculate ").concat(r)))});if(typeof global!=="undefined"){mn.set("global",global)}else if(typeof window!=="undefined"){mn.set("window",window)}function wn(n,e,t){var r=arguments.length>3&&arguments[3]!==g?arguments[3]:null;var i=n?" in function `".concat(n,"`"):"";if(r!==null){i+=" argument ".concat(r)}return"Expecting ".concat(t," got ").concat(e).concat(i)}function _n(n,e,t){var r=arguments.length>3&&arguments[3]!==g?arguments[3]:null;var i=xn(e);if(i!==t){throw new Error(wn(n,i,t,r))}}function xn(n){var e={pair:M,symbol:L,macro:J,array:Array,native_symbol:c.Symbol};if(n===P){return"nil"}if(n===null){return"null"}var t=Object.entries(e);for(var r=0;r<t.length;r++){var i=Rn(t[r],2),a=i[0],o=i[1];if(n instanceof o){return a}}if(n instanceof ln){return"number"}if(n instanceof RegExp){return"regex"}if(Tn(n)==="object"){return n.constructor.name}return Tn(n)}function kn(n){var e=[];t(n);if(e.length){return a(n)}return n;function t(n){if(Y(n)){e.push(n)}else if(n instanceof M){if(!n.haveCycles("car")){t(n.car)}if(!n.haveCycles("cdr")){t(n.cdr)}}else if(n instanceof Array){n.forEach(t)}}function r(n){return i.apply(this,arguments)}function i(){i=Bn(Mn.mark(function n(t){var r;return Mn.wrap(function n(e){while(1){switch(e.prev=e.next){case 0:e.t0=M;if(!t.haveCycles("car")){e.next=5;break}e.t1=t.car;e.next=8;break;case 5:e.next=7;return a(t.car);case 7:e.t1=e.sent;case 8:e.t2=e.t1;if(!t.haveCycles("cdr")){e.next=13;break}e.t3=t.cdr;e.next=16;break;case 13:e.next=15;return a(t.cdr);case 15:e.t3=e.sent;case 16:e.t4=e.t3;r=new e.t0(e.t2,e.t4);if(t.data){r.data=true}return e.abrupt("return",r);case 20:case"end":return e.stop()}}},n)}));return i.apply(this,arguments)}function a(n){if(n instanceof Array){return Promise.all(n.map(a))}if(n instanceof M&&e.length){return r(n)}return n}}function jn(n,e){var t=e.env,r=e.dynamic_scope,i=e.error;var a=[];var o=n;R(o);while(true){if(o instanceof M&&!H(o)){var 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n.markCycles()}return n})}else if(typeof u!=="function"){if(u){var f="".concat(xn(u)," `").concat(u,"' is not a function");throw new Error(f)}throw new Error("Unknown function `".concat(c.name,"'"))}}else if(typeof c==="function"){u=c}if(typeof u==="function"){var l=jn(s,o);return d(l,function(n){var e=i||r;var t=kn(u.apply(e,n));return d(t,function(n){if(n instanceof M){return dn(n.markCycles())}return n},a)})}else if(e instanceof L){u=r.get(e);if(u==="undefined"){throw new Error("Unbound variable `"+e.name+"'")}return u}else if(e instanceof M){u=c&&c.toString();throw new Error("".concat(xn(c)," ").concat(u," is not a function"))}else{return e}}catch(n){a&&a(n,e)}}function En(n,e,t){return An.apply(this,arguments)}function An(){An=Bn(Mn.mark(function n(t,r,i){var a,o,u,c,s;return Mn.wrap(function n(e){while(1){switch(e.prev=e.next){case 0:if(i===true){r=i=r||mn}else if(r===true){r=i=mn}else{r=r||mn}a=b(t,true).map(function(n){if(n.token.match(l)&&n.col){var e=new RegExp("^ 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P};L.prototype.toDry=function(){return{value:{name:this.name}}};L.unDry=function(n){return new L(n.name)};function Ln(){var i="text/x-lips";if(window.document){var a=Array.from(document.querySelectorAll("script"));return function n(){var e=a.shift();if(e){var t=e.getAttribute("type");if(t===i){var r=e.getAttribute("src");if(r){return c.fetch(r).then(function(n){return n.text()}).then(En).then(n)}else{return En(e.innerHTML).then(n)}}else if(t&&t.match(/lips|lisp/)){console.warn("Expecting "+i+" found "+t)}return n()}}()}}if(typeof window!=="undefined"){n(window,Ln)}var In={version:"0.11.2",exec:En,parse:p,tokenize:b,evaluate:Fn,Environment:pn,global_environment:mn,globalEnvironment:mn,env:mn,balanced_parenthesis:On,balancedParenthesis:On,Macro:J,quote:dn,Pair:M,Formatter:j,specials:m,nil:P,resolvePromises:kn,Symbol:L,LNumber:ln};mn.set("lips",In);return In})})();
\ No newline at end of file
diff --git a/src/lips.js b/src/lips.js
index d9bdc299..5d5592e0 100644
--- a/src/lips.js
+++ b/src/lips.js
@@ -2027,14 +2027,26 @@
             Function return new Pair out of two arguments.`),
         // ------------------------------------------------------------------
         car: doc(function(list) {
+            if (list === nil) {
+                return nil;
+            }
             typecheck('car', list, 'pair');
+            if (isEmptyList(list)) {
+                return nil;
+            }
             return list.car;
         }, `(car pair)
 
             Function returns car (head) of the list/pair.`),
         // ------------------------------------------------------------------
         cdr: doc(function(list) {
+            if (list === nil) {
+                return nil;
+            }
             typecheck('cdr', list, 'pair');
+            if (isEmptyList(list)) {
+                return nil;
+            }
             return list.cdr;
         }, `(cdr pair)
 
@@ -3513,6 +3525,10 @@
         const name = 'c' + spec + 'r';
         global_env.set(name, doc(function(arg) {
             return chars.reduce(function(list, type) {
+                if (list === nil) {
+                    return nil;
+                }
+                typecheck(name, list, 'pair');
                 if (type === 'a') {
                     return list.car;
                 } else {