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lang.js
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lang.js
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/* Copyright (C) 2016-2022 Greenbone AG
*
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import i18next from 'i18next';
import HttpBackend from 'i18next-http-backend';
import logger from 'gmp/log';
import {isDefined} from 'gmp/utils/identity';
import {setLocale as setDateLocale} from './date';
import Detector from './detector';
import {getLanguageCodes} from './languages';
import {split} from 'gmp/utils/string';
const log = logger.getLogger('gmp.locale.lang');
let languageChangelisteners = [];
let currentLocale;
const notifyLanguageChangeListeners = (lang, initial = false) => {
for (const listener of languageChangelisteners) {
listener(lang, initial);
}
};
const fallbackLng = 'en';
const whitelist = getLanguageCodes();
const I18N_OPTIONS = {
storage: global.localStorage,
nsSeparator: false, // don't use a namespace separator in keys
keySeparator: false, // don't use a key separator in keys
fallbackLng,
ns: ['gsa'], // use gsa as namespace
defaultNS: 'gsa',
fallbackNS: 'gsa',
backend: {
loadPath: '/locales/{{ns}}-{{lng}}.json', // e.g. /locales/gsa-en.json
},
supportedLngs: whitelist,
nonExplicitSupportedLngs: false,
interpolation: {
skipOnVariables: false,
},
};
i18next.on('languageChanged', lang => {
if (currentLocale !== lang) {
log.debug('Language changed to', lang);
currentLocale = lang;
setDateLocale(lang);
notifyLanguageChangeListeners(lang);
}
});
export const initLocale = ({
backend = HttpBackend,
detector = Detector,
options = I18N_OPTIONS,
} = {}) => i18next.use(backend).use(detector).init(options);
/**
* Subscribe to get notified about locale changes
*
* @param {Function} listener Function to get called when language changes
*
* @returns {Function} Unsubscribe function
*/
export const onLanguageChange = listener => {
languageChangelisteners.push(listener);
return () =>
(languageChangelisteners = languageChangelisteners.filter(
l => l !== listener,
));
};
/**
* Get the current used locale
*
* @returns {String} Language code of the current used language
*/
export const getLocale = () => currentLocale;
/**
* Change the current used locale
*
* @param {String} lang Language (code) to be set. Pass undefined
* to start automatic detection.
*/
export const setLocale = lang => {
if (isDefined(lang)) {
const code = lang.includes('-') ? split(lang, '-', 1)[0] : lang;
if (!whitelist.includes(lang) && !whitelist.includes(code)) {
log.warn(`Unknown locale ${lang}. Possible locales are ${whitelist}
Falling back to ${fallbackLng}.`);
lang = fallbackLng;
}
}
i18next.changeLanguage(lang, err => {
if (isDefined(err)) {
log.warn('Error while setting language to', lang, err);
}
});
};
class LazyTranslate {
constructor(key, options) {
this.key = key;
this.options = options;
}
toString() {
/* i18next-extract-disable-next-line */
return i18next.t(this.key, this.options);
}
}
/* i18next-extract-disable-next-line */
const translate = (key, options) => i18next.t(key, options);
const translateLazy = (key, options) => new LazyTranslate(key, options);
export {translate as _};
export {translateLazy as _l};
// vim: set ts=2 sw=2 tw=80: