95 lines
2.5 KiB
TypeScript
95 lines
2.5 KiB
TypeScript
// Copyright 2017-2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { join } from 'path';
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import { readFileSync } from 'fs';
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import { merge } from 'lodash';
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import { setupI18n } from '../ts/util/setupI18n';
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import type { LoggerType } from '../ts/types/Logging';
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import type { LocaleMessagesType } from '../ts/types/I18N';
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import type { LocalizerType } from '../ts/types/Util';
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function removeRegion(locale: string): string {
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const match = /^([^-]+)(-.+)$/.exec(locale);
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if (match) {
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return match[1];
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}
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return locale;
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}
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function getLocaleMessages(locale: string): LocaleMessagesType {
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const targetFile = join(__dirname, '..', '_locales', locale, 'messages.json');
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return JSON.parse(readFileSync(targetFile, 'utf-8'));
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}
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export type LocaleType = {
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i18n: LocalizerType;
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name: string;
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messages: LocaleMessagesType;
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};
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function finalize(
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messages: LocaleMessagesType,
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backupMessages: LocaleMessagesType,
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localeName: string
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) {
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// We start with english, then overwrite that with anything present in locale
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const finalMessages = merge(backupMessages, messages);
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const i18n = setupI18n(localeName, finalMessages);
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return {
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i18n,
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name: localeName,
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messages: finalMessages,
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};
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}
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export function load({
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appLocale,
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logger,
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}: {
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appLocale: string;
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logger: Pick<LoggerType, 'error' | 'warn'>;
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}): LocaleType {
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if (!appLocale) {
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throw new TypeError('`appLocale` is required');
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}
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if (!logger || !logger.error) {
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throw new TypeError('`logger.error` is required');
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}
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if (!logger.warn) {
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throw new TypeError('`logger.warn` is required');
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}
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const english = getLocaleMessages('en');
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// Load locale - if we can't load messages for the current locale, we
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// default to 'en'
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//
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// possible locales:
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// https://source.chromium.org/chromium/chromium/src/+/main:ui/base/l10n/l10n_util.cc
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const languageOnly = removeRegion(appLocale);
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try {
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return finalize(getLocaleMessages(appLocale), english, appLocale);
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} catch (e) {
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logger.warn(`Problem loading messages for locale ${appLocale}`);
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}
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try {
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logger.warn(`Falling back to parent language: '${languageOnly}'`);
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// Note: messages are from parent language, but we still keep the region
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return finalize(getLocaleMessages(languageOnly), english, appLocale);
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} catch (e) {
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logger.error(`Problem loading messages for locale ${languageOnly}`);
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logger.warn("Falling back to 'en' locale");
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return finalize(english, english, 'en');
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}
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}
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