@theia/core/src/browser/preload/i18n-preload-contribution.ts

Theia is a cloud & desktop IDE framework implemented in TypeScript.

// *****************************************************************************
// Copyright (C) 2023 TypeFox and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************

import { PreloadContribution } from './preloader';
import { FrontendApplicationConfigProvider } from '../frontend-application-config-provider';
import { nls } from '../../common/nls';
import { inject, injectable } from 'inversify';
import { LocalizationServer } from '../../common/i18n/localization-server';

@injectable()
export class I18nPreloadContribution implements PreloadContribution {

    @inject(LocalizationServer)
    protected readonly localizationServer: LocalizationServer;

    async initialize(): Promise<void> {
        const defaultLocale = FrontendApplicationConfigProvider.get().defaultLocale;
        if (defaultLocale && !nls.locale) {
            Object.assign(nls, {
                locale: defaultLocale
            });
        }
        if (nls.locale) {
            const localization = await this.localizationServer.loadLocalization(nls.locale);
            if (localization.languagePack) {
                nls.localization = localization;
            } else {
                // In case the localization that we've loaded doesn't localize Theia completely (languagePack is false)
                // We simply reset the locale to the default again
                Object.assign(nls, {
                    locale: defaultLocale || undefined
                });
            }
        }
    }

}