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/*
* Copyright (C) 2022 Kristóf Marussy <kristof@marussy.com>
*
* This file is part of Sophie.
*
* Sophie 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, version 3.
*
* 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 <https://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
import type { i18n, TFunction } from 'i18next';
import { IAtom, createAtom } from 'mobx';
import { getLogger } from '../utils/log';
const log = getLogger('I18nStore');
export type UseTranslationResult =
| { ready: true; i18n: i18n; t: TFunction }
| { ready: false };
export default class I18nStore {
private readonly languageChangedAtom: IAtom;
private readonly namespaceLoadedAtoms: Map<string, IAtom> = new Map();
private readonly notifyLanguageChange = () =>
this.languageChangedAtom.reportObserved();
constructor(private readonly i18next: i18n) {
this.languageChangedAtom = createAtom(
'i18next',
() => i18next.on('languageChanged', this.notifyLanguageChange),
() => i18next.off('languageChanged', this.notifyLanguageChange),
);
}
useTranslation(ns?: string): UseTranslationResult {
const observed = this.languageChangedAtom.reportObserved();
const namespaceToLoad =
ns ?? this.i18next.options.defaultNS ?? 'translation';
if (
this.i18next.isInitialized &&
this.i18next.hasLoadedNamespace(namespaceToLoad)
) {
return {
ready: true,
i18n: this.i18next,
// eslint-disable-next-line unicorn/no-null -- `i18next` API requires `null`.
t: this.i18next.getFixedT(null, namespaceToLoad),
};
}
if (observed) {
this.loadNamespace(namespaceToLoad);
}
return { ready: false };
}
private loadNamespace(ns: string): void {
const existingAtom = this.namespaceLoadedAtoms.get(ns);
if (existingAtom !== undefined) {
existingAtom.reportObserved();
return;
}
const atom = createAtom(`i18next-${ns}`);
this.namespaceLoadedAtoms.set(ns, atom);
atom.reportObserved();
const loaded = () => {
this.namespaceLoadedAtoms.delete(ns);
atom.reportChanged();
};
const loadAsync = async () => {
await this.i18next.loadNamespaces([ns]);
if (this.i18next.isInitialized) {
setImmediate(loaded);
return;
}
const initialized = () => {
setImmediate(() => {
this.i18next.off('initialized', initialized);
loaded();
});
};
this.i18next.on('initialized', initialized);
};
loadAsync().catch((error) => {
log.error('Failed to load translations for namespace', ns, error);
setImmediate(loaded);
});
}
}
|
