feat(web): load .kmx keyboard from blob

This change adds the web side of loading a .kmx keyboard from a
blob. It also replaces the `CoreProcessor` class with `CoreFactory`
that allows to directly use the methods defined in WASM without
having to add another wrapper for each method.

core/include/keyman/keyman_core_api.h

@@ -302,11 +302,14 @@ typedef uint8_t (*km_core_keyboard_imx_platform)(km_core_state*, uint32_t, void*
 
 ## Description
 
-An error code mechanism similar to COM’s `HRESULT` scheme (unlike COM, any
+An error code mechanism similar to COM's `HRESULT` scheme (unlike COM, any
 non-zero value is an error).
 
 ## Specification
 
+-->
+// keep in sync with web/src/engine/core-processor/src/core-factory.ts
+<!--
 ```c */
 enum km_core_status_codes {
   KM_CORE_STATUS_OK = 0,

web/build.sh

@@ -122,6 +122,9 @@ build_action() {
 
   tsc --project "${KEYMAN_ROOT}/web/src/test/auto/tsconfig.json"
 
+  mkdir -p "${KEYMAN_ROOT}/web/build/test/dom/cases/core-processor/import/core/"
+  cp "${KEYMAN_ROOT}/web/src/engine/core-processor/src/import/core/keymancore.d.ts" "${KEYMAN_ROOT}/web/build/test/dom/cases/core-processor/import/core/"
+
   for dir in \
     "${KEYMAN_ROOT}/web/build/test/dom/cases"/*/ \
     "${KEYMAN_ROOT}/web/build/test/integrated/" \

web/src/engine/core-processor/src/core-factory.ts

@@ -0,0 +1,38 @@
+// Keyman is copyright (C) SIL International. MIT License.
+
+import { type MainModule } from './import/core/keymancore.js';
+
+// Unfortunately embind has an open issue with enums and typescript where it
+// only generates a type for the enum, but not the values in a usable way.
+// So we have to re-define the enum here.
+// See https://github.com/emscripten-core/emscripten/issues/18585
+// NOTE: Keep in sync with core/include/keyman/keyman_core_api.h#L311
+export enum KM_CORE_STATUS {
+  OK = 0,
+  NO_MEM = 1,
+  IO_ERROR = 2,
+  INVALID_ARGUMENT = 3,
+  KEY_ERROR = 4,
+  INSUFFICENT_BUFFER = 5,
+  INVALID_UTF = 6,
+  INVALID_KEYBOARD = 7,
+  NOT_IMPLEMENTED = 8,
+  OS_ERROR = 0x80000000
+}
+
+export class CoreFactory {
+  public static async createCoreProcessor(baseurl: string): Promise<MainModule> {
+    try {
+      const module = await import(baseurl + '/km-core.js');
+      const createCoreProcessor = module.default;
+      return await createCoreProcessor({
+        locateFile: function (path: string, scriptDirectory: string) {
+          return baseurl + '/' + path;
+        }
+      });
+    } catch (e: any) {
+      console.log('got execption in CoreFactory.createCoreProcessor', e);
+      return null;
+    }
+  }
+}

web/src/engine/core-processor/src/index.ts

@@ -1 +1,3 @@
-export * from './core-processor.js';
+export * from './core-factory.js';
+import { type MainModule, type km_core_keyboard, type CoreKeyboardReturn } from './import/core/keymancore.js';
+export { MainModule, km_core_keyboard, CoreKeyboardReturn };

web/src/engine/main/src/headless/inputProcessor.ts

@@ -5,7 +5,8 @@ import { LanguageProcessor }  from "./languageProcessor.js";
 import type { ModelSpec, PathConfiguration }  from "keyman/engine/interfaces";
 import { globalObject, DeviceSpec } from "@keymanapp/web-utils";
 
-import { CoreProcessor } from "keyman/engine/core-processor";
+import { CoreFactory, MainModule as KmCoreModule } from 'keyman/engine/core-processor';
+
 import { Codes, type Keyboard, type KeyEvent } from "keyman/engine/keyboard";
 import {
   type Alternate,
@@ -35,7 +36,7 @@ export class InputProcessor {
   private contextDevice: DeviceSpec;
   private kbdProcessor: KeyboardProcessor;
   private lngProcessor: LanguageProcessor;
-  private coreProcessor: CoreProcessor;
+  private km_core: KmCoreModule;
 
   private readonly contextCache = new TranscriptionCache();
 
@@ -51,11 +52,10 @@ export class InputProcessor {
     this.contextDevice = device;
     this.kbdProcessor = new KeyboardProcessor(device, options);
     this.lngProcessor = new LanguageProcessor(predictiveTextWorker, this.contextCache);
-    this.coreProcessor = new CoreProcessor();
   }
 
   public async init(paths: PathConfiguration) {
-    this.coreProcessor.init(paths.basePath);
+    this.km_core = await CoreFactory.createCoreProcessor(paths.basePath);
   }
 
   public get languageProcessor(): LanguageProcessor {
@@ -70,6 +70,10 @@ export class InputProcessor {
     return this.keyboardProcessor.keyboardInterface;
   }
 
+  public get keymanCore(): KmCoreModule {
+    return this.km_core;
+  }
+
   public get activeKeyboard(): Keyboard {
     return this.keyboardInterface.activeKeyboard;
   }

web/src/test/auto/dom/cases/core-processor/basic.tests.ts

@@ -1,21 +1,38 @@
 import { assert } from 'chai';
-import { CoreProcessor } from 'keyman/engine/core-processor';
+import { CoreFactory, KM_CORE_STATUS } from 'keyman/engine/core-processor';
 
-const coreurl = '/web/build/engine/core-processor/obj/import/core';
+const coreurl = '/build/engine/core-processor/obj/import/core';
 
 // Test the CoreProcessor interface.
 describe('CoreProcessor', function () {
+  async function loadKeyboardBlob(uri: string) {
+    const response = await fetch(uri);
+    if (!response.ok) {
+      throw new Error(`HTTP ${response.status} ${response.statusText}`);
+    }
+
+    const buffer = await response.arrayBuffer();
+    return new Uint8Array(buffer);
+  }
+
   it('can initialize without errors', async function () {
-    const kp = new CoreProcessor();
-    assert.isTrue(await kp.init(coreurl));
+    assert.isNotNull(await CoreFactory.createCoreProcessor(coreurl));
   });
 
   it('can call temp function', async function () {
-    const kp = new CoreProcessor();
-    await kp.init(coreurl);
-    const a = kp.tmp_wasm_attributes();
+    const km_core = await CoreFactory.createCoreProcessor(coreurl);
+    const a = km_core.tmp_wasm_attributes();
     assert.isNotNull(a);
     assert.isNumber(a.max_context);
     console.dir(a);
   });
+
+  it('can load a keyboard from blob', async function () {
+    const km_core = await CoreFactory.createCoreProcessor(coreurl);
+    const blob = await loadKeyboardBlob('/common/test/resources/keyboards/test_8568_deadkeys.kmx')
+    const result = km_core.keyboard_load_from_blob('test', blob);
+    assert.equal(result.status, KM_CORE_STATUS.OK);
+    assert.isNotNull(result.object);
+    result.delete();
+  });
 });

web/src/test/auto/dom/web-test-runner.config.mjs

@@ -92,6 +92,8 @@ export default {
     function rewriteResourcePath(context, next) {
       if(context.url.startsWith('/resources/')) {
         context.url = '/web/src/test/auto' + context.url;
+      } else if (context.url.startsWith('/build/')) {
+        context.url = '/web' + context.url;
       }
 
       return next();