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diff --git a/ext/mixed/js/yomichan.js b/ext/mixed/js/yomichan.js
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+/*
+ * Copyright (C) 2020 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+const yomichan = (() => {
+ class Yomichan extends EventDispatcher {
+ constructor() {
+ super();
+
+ const {promise, resolve} = deferPromise();
+ this._isBackendPreparedPromise = promise;
+ this._isBackendPreparedPromiseResolve = resolve;
+
+ this._messageHandlers = new Map([
+ ['backendPrepared', this._onMessageBackendPrepared.bind(this)],
+ ['getUrl', this._onMessageGetUrl.bind(this)],
+ ['optionsUpdated', this._onMessageOptionsUpdated.bind(this)],
+ ['zoomChanged', this._onMessageZoomChanged.bind(this)]
+ ]);
+ }
+
+ // Public
+
+ prepare() {
+ chrome.runtime.onMessage.addListener(this._onMessage.bind(this));
+ }
+
+ ready() {
+ chrome.runtime.sendMessage({action: 'yomichanCoreReady'});
+ return this._isBackendPreparedPromise;
+ }
+
+ generateId(length) {
+ const array = new Uint8Array(length);
+ crypto.getRandomValues(array);
+ let id = '';
+ for (const value of array) {
+ id += value.toString(16).padStart(2, '0');
+ }
+ return id;
+ }
+
+ triggerOrphaned(error) {
+ this.trigger('orphaned', {error});
+ }
+
+ isExtensionUrl(url) {
+ try {
+ return url.startsWith(chrome.runtime.getURL('/'));
+ } catch (e) {
+ return false;
+ }
+ }
+
+ getTemporaryListenerResult(eventHandler, userCallback, timeout=null) {
+ if (!(
+ typeof eventHandler.addListener === 'function' &&
+ typeof eventHandler.removeListener === 'function'
+ )) {
+ throw new Error('Event handler type not supported');
+ }
+
+ return new Promise((resolve, reject) => {
+ const runtimeMessageCallback = ({action, params}, sender, sendResponse) => {
+ let timeoutId = null;
+ if (timeout !== null) {
+ timeoutId = setTimeout(() => {
+ timeoutId = null;
+ eventHandler.removeListener(runtimeMessageCallback);
+ reject(new Error(`Listener timed out in ${timeout} ms`));
+ }, timeout);
+ }
+
+ const cleanupResolve = (value) => {
+ if (timeoutId !== null) {
+ clearTimeout(timeoutId);
+ timeoutId = null;
+ }
+ eventHandler.removeListener(runtimeMessageCallback);
+ sendResponse();
+ resolve(value);
+ };
+
+ userCallback({action, params}, {resolve: cleanupResolve, sender});
+ };
+
+ eventHandler.addListener(runtimeMessageCallback);
+ });
+ }
+
+ logWarning(error) {
+ this.log(error, 'warn');
+ }
+
+ logError(error) {
+ this.log(error, 'error');
+ }
+
+ log(error, level, context=null) {
+ if (!isObject(context)) {
+ context = this._getLogContext();
+ }
+
+ let errorString;
+ try {
+ errorString = error.toString();
+ if (/^\[object \w+\]$/.test(errorString)) {
+ errorString = JSON.stringify(error);
+ }
+ } catch (e) {
+ errorString = `${error}`;
+ }
+
+ let errorStack;
+ try {
+ errorStack = (typeof error.stack === 'string' ? error.stack.trimRight() : '');
+ } catch (e) {
+ errorStack = '';
+ }
+
+ let errorData;
+ try {
+ errorData = error.data;
+ } catch (e) {
+ // NOP
+ }
+
+ if (errorStack.startsWith(errorString)) {
+ errorString = errorStack;
+ } else if (errorStack.length > 0) {
+ errorString += `\n${errorStack}`;
+ }
+
+ const manifest = chrome.runtime.getManifest();
+ let message = `${manifest.name} v${manifest.version} has encountered a problem.`;
+ message += `\nOriginating URL: ${context.url}\n`;
+ message += errorString;
+ if (typeof errorData !== 'undefined') {
+ message += `\nData: ${JSON.stringify(errorData, null, 4)}`;
+ }
+ message += '\n\nIssues can be reported at https://github.com/FooSoft/yomichan/issues';
+
+ switch (level) {
+ case 'info': console.info(message); break;
+ case 'debug': console.debug(message); break;
+ case 'warn': console.warn(message); break;
+ case 'error': console.error(message); break;
+ default: console.log(message); break;
+ }
+
+ this.trigger('log', {error, level, context});
+ }
+
+ // Private
+
+ _getUrl() {
+ return (typeof window === 'object' && window !== null ? window.location.href : '');
+ }
+
+ _getLogContext() {
+ return {url: this._getUrl()};
+ }
+
+ _onMessage({action, params}, sender, callback) {
+ const handler = this._messageHandlers.get(action);
+ if (typeof handler !== 'function') { return false; }
+
+ const result = handler(params, sender);
+ callback(result);
+ return false;
+ }
+
+ _onMessageBackendPrepared() {
+ if (this._isBackendPreparedPromiseResolve === null) { return; }
+ this._isBackendPreparedPromiseResolve();
+ this._isBackendPreparedPromiseResolve = null;
+ }
+
+ _onMessageGetUrl() {
+ return {url: this._getUrl()};
+ }
+
+ _onMessageOptionsUpdated({source}) {
+ this.trigger('optionsUpdated', {source});
+ }
+
+ _onMessageZoomChanged({oldZoomFactor, newZoomFactor}) {
+ this.trigger('zoomChanged', {oldZoomFactor, newZoomFactor});
+ }
+ }
+
+ return new Yomichan();
+})();
+
+yomichan.prepare();