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85 lines
2.6 KiB
Plaintext
85 lines
2.6 KiB
Plaintext
/*
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* Copyright 2020 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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export type LocalizedStrings = {
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[lang: string]: {
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[key: string]: string
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}
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};
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/**
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* Stores a mapping of localized strings. Can be used to find the
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* closest available string for a given locale.
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*/
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export class MessageDictionary {
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private messages: LocalizedStrings;
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private defaultLocale: string;
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constructor(messages: LocalizedStrings, defaultLocale: string = 'en-US') {
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// Clone messages so we don't modify the original object.
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// Filter out entries with falsy values which may have been caused by applying optimize-locales-plugin.
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this.messages = Object.fromEntries(
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Object.entries(messages).filter(([, v]) => v)
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);
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this.defaultLocale = defaultLocale;
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}
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getStringForLocale(key: string, locale: string): string {
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let strings = this.messages[locale];
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if (!strings) {
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strings = getStringsForLocale(locale, this.messages, this.defaultLocale);
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this.messages[locale] = strings;
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}
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let string = strings[key];
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if (!string) {
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throw new Error(`Could not find intl message ${key} in ${locale} locale`);
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}
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return string;
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}
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}
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function getStringsForLocale(locale: string, strings: LocalizedStrings, defaultLocale = 'en-US') {
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// If there is an exact match, use it.
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if (strings[locale]) {
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return strings[locale];
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}
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// Attempt to find the closest match by language.
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// For example, if the locale is fr-CA (French Canadian), but there is only
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// an fr-FR (France) set of strings, use that.
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// This could be replaced with Intl.LocaleMatcher once it is supported.
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// https://github.com/tc39/proposal-intl-localematcher
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let language = getLanguage(locale);
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if (strings[language]) {
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return strings[language];
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}
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for (let key in strings) {
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if (key.startsWith(language + '-')) {
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return strings[key];
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}
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}
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// Nothing close, use english.
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return strings[defaultLocale];
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}
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function getLanguage(locale: string) {
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if (Intl.Locale) {
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return new Intl.Locale(locale).language;
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}
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return locale.split('-')[0];
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}
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