onedeuxtriseigo.nullpo.dev
Pop-up dictionary browser extension for language learning. Successor to Yomichan. (PERSONAL FORK)
1/*
2 * Copyright (C) 2024-2025 Yomitan Authors
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18import {isStringPartiallyJapanese} from './ja/japanese.js';
19import {isStringPartiallyChinese} from './zh/chinese.js';
20
21/**
22 * Returns the language that the string might be by using some heuristic checks.
23 * Values returned are ISO codes. `null` is returned if no language can be determined.
24 * @param {string} text
25 * @param {?string} language
26 * @returns {?string}
27 */
28export function getLanguageFromText(text, language) {
29 const partiallyJapanese = isStringPartiallyJapanese(text);
30 const partiallyChinese = isStringPartiallyChinese(text);
31 if (!['zh', 'yue'].includes(language ?? '')) {
32 if (partiallyJapanese) { return 'ja'; }
33 if (partiallyChinese) { return 'zh'; }
34 }
35 return language;
36}