/* * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net> * Author: Alex Yatskov <alex@foosoft.net> * * 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 <http://www.gnu.org/licenses/>. */ class Mecab { constructor() { this.port = null; this.listeners = {}; this.sequence = 0; } onError(error) { logError(error, false); } async checkVersion() { try { const {version} = await this.invoke('get_version', {}); if (version !== Mecab.version) { this.stopListener(); throw new Error(`Unsupported MeCab native messenger version ${version}. Yomichan supports version ${Mecab.version}.`); } } catch (error) { this.onError(error); } } async parseText(text) { return await this.invoke('parse_text', {text}); } startListener() { if (this.port !== null) { return; } this.port = chrome.runtime.connectNative('yomichan_mecab'); this.port.onMessage.addListener(this.onNativeMessage.bind(this)); this.checkVersion(); } stopListener() { if (this.port === null) { return; } this.port.disconnect(); this.port = null; this.listeners = {}; this.sequence = 0; } onNativeMessage({sequence, data}) { if (this.listeners.hasOwnProperty(sequence)) { const {callback, timer} = this.listeners[sequence]; clearTimeout(timer); callback(data); delete this.listeners[sequence]; } } invoke(action, params) { if (this.port === null) { return Promise.resolve({}); } return new Promise((resolve, reject) => { const sequence = this.sequence++; this.listeners[sequence] = { callback: resolve, timer: setTimeout(() => { delete this.listeners[sequence]; reject(new Error(`Mecab invoke timed out in ${Mecab.timeout} ms`)); }, Mecab.timeout) } this.port.postMessage({action, params, sequence}); }); } } Mecab.timeout = 5000; Mecab.version = 1;