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-rw-r--r--ext/bg/js/mecab.js92
1 files changed, 92 insertions, 0 deletions
diff --git a/ext/bg/js/mecab.js b/ext/bg/js/mecab.js
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index 00000000..62111f73
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+++ b/ext/bg/js/mecab.js
@@ -0,0 +1,92 @@
+/*
+ * 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 (hasOwn(this.listeners, 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;