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/*
* Copyright (C) 2019-2021 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/>.
*/
/**
* This class is used to connect Yomichan to a native component that is
* used to parse text into individual terms.
*/
class Mecab {
/**
* Creates a new instance of the class.
*/
constructor() {
this._port = null;
this._sequence = 0;
this._invocations = new Map();
this._eventListeners = new EventListenerCollection();
this._timeout = 5000;
this._version = 1;
this._remoteVersion = null;
this._enabled = false;
this._setupPortPromise = null;
}
/**
* Returns whether or not the component is enabled.
*/
isEnabled() {
return this._enabled;
}
/**
* Changes whether or not the component connection is enabled.
* @param enabled A boolean indicating whether or not the component should be enabled.
*/
setEnabled(enabled) {
this._enabled = !!enabled;
if (!this._enabled && this._port !== null) {
this._clearPort();
}
}
/**
* Gets the version of the MeCab component.
* @returns The version of the MeCab component, or `null` if the component was not found.
*/
async getVersion() {
try {
await this._setupPort();
} catch (e) {
// NOP
}
return this._remoteVersion;
}
/**
* Parses a string of Japanese text into arrays of lines and terms.
*
* Return value format:
* ```js
* [
* {
* name: (string),
* lines: [
* {expression: (string), reading: (string), source: (string)},
* ...
* ]
* },
* ...
* ]
* ```
* @param text The string to parse.
* @returns A collection of parsing results of the text.
*/
async parseText(text) {
await this._setupPort();
const rawResults = await this._invoke('parse_text', {text});
return this._convertParseTextResults(rawResults);
}
// Private
_onMessage({sequence, data}) {
const invocation = this._invocations.get(sequence);
if (typeof invocation === 'undefined') { return; }
const {resolve, timer} = invocation;
clearTimeout(timer);
resolve(data);
this._invocations.delete(sequence);
}
_onDisconnect() {
if (this._port === null) { return; }
const e = chrome.runtime.lastError;
const error = new Error(e ? e.message : 'MeCab disconnected');
for (const {reject, timer} of this._invocations.values()) {
clearTimeout(timer);
reject(error);
}
this._clearPort();
}
_invoke(action, params) {
return new Promise((resolve, reject) => {
if (this._port === null) {
reject(new Error('Port disconnected'));
}
const sequence = this._sequence++;
const timer = setTimeout(() => {
this._invocations.delete(sequence);
reject(new Error(`MeCab invoke timed out after ${this._timeout}ms`));
}, this._timeout);
this._invocations.set(sequence, {resolve, reject, timer}, this._timeout);
this._port.postMessage({action, params, sequence});
});
}
_convertParseTextResults(rawResults) {
const results = [];
for (const [name, rawLines] of Object.entries(rawResults)) {
const lines = [];
for (const rawLine of rawLines) {
const line = [];
for (let {expression, reading, source} of rawLine) {
if (typeof expression !== 'string') { expression = ''; }
if (typeof reading !== 'string') { reading = ''; }
if (typeof source !== 'string') { source = ''; }
line.push({expression, reading, source});
}
lines.push(line);
}
results.push({name, lines});
}
return results;
}
async _setupPort() {
if (!this._enabled) {
throw new Error('MeCab not enabled');
}
if (this._setupPortPromise === null) {
this._setupPortPromise = this._setupPort2();
}
try {
await this._setupPortPromise;
} catch (e) {
throw new Error(e.message);
}
}
async _setupPort2() {
const port = chrome.runtime.connectNative('yomichan_mecab');
this._eventListeners.addListener(port.onMessage, this._onMessage.bind(this));
this._eventListeners.addListener(port.onDisconnect, this._onDisconnect.bind(this));
this._port = port;
try {
const {version} = await this._invoke('get_version', {});
this._remoteVersion = version;
if (version !== this._version) {
throw new Error(`Unsupported MeCab native messenger version ${version}. Yomichan supports version ${this._version}.`);
}
} catch (e) {
if (this._port === port) {
this._clearPort();
}
throw e;
}
}
_clearPort() {
this._port.disconnect();
this._port = null;
this._invocations.clear();
this._eventListeners.removeAllEventListeners();
this._sequence = 0;
this._setupPortPromise = null;
}
}
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