signal-desktop/sticker-creator/util/i18n.tsx

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2020-10-30 20:34:04 +00:00
// Copyright 2019-2020 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
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import * as React from 'react';
import type { LocalizerType, ReplacementValuesType } from '../../ts/types/Util';
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const placeholder = () => 'NO LOCALE LOADED';
placeholder.getLocale = () => 'none';
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const I18nContext = React.createContext<LocalizerType>(placeholder);
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export type I18nProps = {
children: React.ReactNode;
locale: string;
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messages: { [key: string]: { message: string } };
};
export const I18n = ({
messages,
locale,
children,
}: I18nProps): JSX.Element => {
const callback = (key: string, substitutions?: ReplacementValuesType) => {
if (Array.isArray(substitutions) && substitutions.length > 1) {
throw new Error(
'Array syntax is not supported with more than one placeholder'
);
}
const stringInfo = messages[key];
if (!stringInfo) {
window.SignalContext.log.warn(
`getMessage: No string found for key ${key}`
);
return '';
}
const { message } = stringInfo;
if (!substitutions) {
return message;
}
if (Array.isArray(substitutions)) {
return substitutions.reduce(
(result, substitution) =>
result.toString().replace(/\$.+?\$/, substitution.toString()),
message
) as string;
}
const FIND_REPLACEMENTS = /\$([^$]+)\$/g;
let match = FIND_REPLACEMENTS.exec(message);
let builder = '';
let lastTextIndex = 0;
while (match) {
if (lastTextIndex < match.index) {
builder += message.slice(lastTextIndex, match.index);
}
const placeholderName = match[1];
const value = substitutions[placeholderName];
if (!value) {
// eslint-disable-next-line no-console
console.error(
`i18n: Value not provided for placeholder ${placeholderName} in key '${key}'`
);
}
builder += value || '';
lastTextIndex = FIND_REPLACEMENTS.lastIndex;
match = FIND_REPLACEMENTS.exec(message);
}
if (lastTextIndex < message.length) {
builder += message.slice(lastTextIndex);
}
return builder;
};
callback.getLocale = () => locale;
const getMessage = React.useCallback<LocalizerType>(callback, [messages]);
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return (
<I18nContext.Provider value={getMessage}>{children}</I18nContext.Provider>
);
};
export const useI18n = (): LocalizerType => React.useContext(I18nContext);