90 lines
2.4 KiB
TypeScript
90 lines
2.4 KiB
TypeScript
// Copyright 2019-2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import * as React from 'react';
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import type { LocalizerType, ReplacementValuesType } from '../../ts/types/Util';
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const placeholder = () => 'NO LOCALE LOADED';
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placeholder.getLocale = () => 'none';
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const I18nContext = React.createContext<LocalizerType>(placeholder);
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export type I18nProps = {
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children: React.ReactNode;
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locale: string;
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messages: { [key: string]: { message: string } };
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};
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export const I18n = ({
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messages,
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locale,
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children,
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}: I18nProps): JSX.Element => {
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const callback = (key: string, substitutions?: ReplacementValuesType) => {
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if (Array.isArray(substitutions) && substitutions.length > 1) {
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throw new Error(
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'Array syntax is not supported with more than one placeholder'
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);
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}
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const stringInfo = messages[key];
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if (!stringInfo) {
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window.SignalContext.log.warn(
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`getMessage: No string found for key ${key}`
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);
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return '';
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}
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const { message } = stringInfo;
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if (!substitutions) {
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return message;
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}
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if (Array.isArray(substitutions)) {
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return substitutions.reduce(
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(result, substitution) =>
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result.toString().replace(/\$.+?\$/, substitution.toString()),
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message
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) as string;
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}
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const FIND_REPLACEMENTS = /\$([^$]+)\$/g;
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let match = FIND_REPLACEMENTS.exec(message);
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let builder = '';
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let lastTextIndex = 0;
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while (match) {
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if (lastTextIndex < match.index) {
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builder += message.slice(lastTextIndex, match.index);
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}
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const placeholderName = match[1];
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const value = substitutions[placeholderName];
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if (!value) {
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// eslint-disable-next-line no-console
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console.error(
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`i18n: Value not provided for placeholder ${placeholderName} in key '${key}'`
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);
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}
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builder += value || '';
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lastTextIndex = FIND_REPLACEMENTS.lastIndex;
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match = FIND_REPLACEMENTS.exec(message);
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}
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if (lastTextIndex < message.length) {
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builder += message.slice(lastTextIndex);
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}
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return builder;
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};
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callback.getLocale = () => locale;
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const getMessage = React.useCallback<LocalizerType>(callback, [messages]);
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return (
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<I18nContext.Provider value={getMessage}>{children}</I18nContext.Provider>
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);
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};
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export const useI18n = (): LocalizerType => React.useContext(I18nContext);
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