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/*
* 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, true);
}
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 {};
}
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;
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