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73 lines
2.9 KiB
Plaintext
73 lines
2.9 KiB
Plaintext
/*
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* Copyright 2022 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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import type {LocalizedStringDictionary} from './LocalizedStringDictionary';
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export type Variables = Record<string, string | number | boolean> | undefined;
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export type LocalizedString = string | ((args: Variables, formatter?: LocalizedStringFormatter<any, any>) => string);
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type InternalString = string | (() => string);
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const pluralRulesCache = new Map<string, Intl.PluralRules>();
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const numberFormatCache = new Map<string, Intl.NumberFormat>();
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/**
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* Formats localized strings from a LocalizedStringDictionary. Supports interpolating variables,
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* selecting the correct pluralization, and formatting numbers for the locale.
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*/
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export class LocalizedStringFormatter<K extends string = string, T extends LocalizedString = string> {
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private locale: string;
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private strings: LocalizedStringDictionary<K, T>;
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constructor(locale: string, strings: LocalizedStringDictionary<K, T>) {
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this.locale = locale;
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this.strings = strings;
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}
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/** Formats a localized string for the given key with the provided variables. */
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format(key: K, variables?: Variables): string {
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let message = this.strings.getStringForLocale(key, this.locale);
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return typeof message === 'function' ? message(variables, this) : message;
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}
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protected plural(count: number, options: Record<string, InternalString>, type: Intl.PluralRuleType = 'cardinal'): string {
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let opt = options['=' + count];
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if (opt) {
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return typeof opt === 'function' ? opt() : opt;
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}
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let key = this.locale + ':' + type;
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let pluralRules = pluralRulesCache.get(key);
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if (!pluralRules) {
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pluralRules = new Intl.PluralRules(this.locale, {type});
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pluralRulesCache.set(key, pluralRules);
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}
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let selected = pluralRules.select(count);
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opt = options[selected] || options.other;
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return typeof opt === 'function' ? opt() : opt;
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}
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protected number(value: number): string {
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let numberFormat = numberFormatCache.get(this.locale);
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if (!numberFormat) {
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numberFormat = new Intl.NumberFormat(this.locale);
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numberFormatCache.set(this.locale, numberFormat);
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}
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return numberFormat.format(value);
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}
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protected select(options: Record<string, InternalString>, value: string): string {
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let opt = options[value] || options.other;
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return typeof opt === 'function' ? opt() : opt;
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}
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}
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