82 lines
2.2 KiB
TypeScript
82 lines
2.2 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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export type I18nFn = (
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key: string,
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substitutions?: Array<string | number> | ReplacementValuesType
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) => string;
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export type ReplacementValuesType = {
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[key: string]: string | number;
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};
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const I18nContext = React.createContext<I18nFn>(() => 'NO LOCALE LOADED');
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export type I18nProps = {
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children: React.ReactNode;
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messages: { [key: string]: { message: string } };
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};
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export const I18n = ({ messages, children }: I18nProps): JSX.Element => {
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const getMessage = React.useCallback<I18nFn>(
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(key, substitutions) => {
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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 { message } = messages[key];
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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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[messages]
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);
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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 = (): I18nFn => React.useContext(I18nContext);
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