53 lines
2.0 KiB
Plaintext
53 lines
2.0 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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import {FormatXMLElementFn, PrimitiveType} from 'intl-messageformat/src/formatters';
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import IntlMessageFormat from 'intl-messageformat';
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import {MessageDictionary} from './MessageDictionary';
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/**
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* Formats ICU Message strings to create localized strings from a MessageDictionary.
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*/
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export class MessageFormatter {
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private locale: string;
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private messages: MessageDictionary;
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private cache: {[key: string]: IntlMessageFormat};
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constructor(locale: string, messages: MessageDictionary) {
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this.locale = locale;
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this.messages = messages;
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this.cache = {};
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}
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format<T = void>(key: string, variables: Record<string, PrimitiveType | T | FormatXMLElementFn<T, string | T | (string | T)[]>> | undefined): string | T | (string | T)[] {
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let message = this.cache[key];
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if (!message) {
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let msg = this.messages.getStringForLocale(key, this.locale);
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if (!msg) {
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throw new Error(`Could not find intl message ${key} in ${this.locale} locale`);
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}
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message = new IntlMessageFormat(msg, this.locale);
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this.cache[key] = message;
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}
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let varCopy: Record<string, PrimitiveType | T | FormatXMLElementFn<T, string | T | (string | T)[]>> | undefined;
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if (variables) {
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varCopy = Object.keys(variables).reduce((acc, key) => {
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acc[key] = variables[key] == null ? false : variables[key];
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return acc;
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}, {});
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}
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return message.format(varCopy);
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}
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}
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