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88 lines
2.6 KiB
Plaintext
88 lines
2.6 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 {isRTL} from './utils';
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import {Locale, useDefaultLocale} from './useDefaultLocale';
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import React, {JSX, ReactNode, useContext} from 'react';
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export interface I18nProviderProps {
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/** Contents that should have the locale applied. */
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children: ReactNode,
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/** The locale to apply to the children. */
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locale?: string
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}
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const I18nContext = React.createContext<Locale | null>(null);
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interface I18nProviderWithLocaleProps extends I18nProviderProps {
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locale: string
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}
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/**
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* Internal component that handles the case when locale is provided.
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*/
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function I18nProviderWithLocale(props: I18nProviderWithLocaleProps): JSX.Element {
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let {locale, children} = props;
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let value: Locale = React.useMemo(() => ({
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locale,
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direction: isRTL(locale) ? 'rtl' : 'ltr'
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}), [locale]);
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return (
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<I18nContext.Provider value={value}>
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{children}
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</I18nContext.Provider>
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);
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}
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interface I18nProviderWithDefaultLocaleProps {
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children: ReactNode
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}
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/**
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* Internal component that handles the case when no locale is provided.
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*/
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function I18nProviderWithDefaultLocale(props: I18nProviderWithDefaultLocaleProps): JSX.Element {
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let {children} = props;
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let defaultLocale = useDefaultLocale();
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return (
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<I18nContext.Provider value={defaultLocale}>
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{children}
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</I18nContext.Provider>
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);
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}
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/**
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* Provides the locale for the application to all child components.
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*/
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export function I18nProvider(props: I18nProviderProps): JSX.Element {
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let {locale, children} = props;
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// Conditionally render different components to avoid calling useDefaultLocale.
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// This is necessary because useDefaultLocale triggers a re-render.
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if (locale) {
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return <I18nProviderWithLocale locale={locale} children={children} />;
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}
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return <I18nProviderWithDefaultLocale children={children} />;
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}
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/**
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* Returns the current locale and layout direction.
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*/
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export function useLocale(): Locale {
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let defaultLocale = useDefaultLocale();
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let context = useContext(I18nContext);
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return context || defaultLocale;
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}
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