Mawoka
67 lines
1.9 KiB
TypeScript
67 lines
1.9 KiB
TypeScript
// SPDX-FileCopyrightText: 2023 Marlon W (Mawoka)
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//
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// SPDX-License-Identifier: MPL-2.0
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import type { I18nService } from './i18n-service';
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import { derived, writable } from 'svelte/store';
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import type { Readable, Writable } from 'svelte/store';
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// eslint-disable-next-line no-unused-vars
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export type TType = (text: string, replacements?: Record<string, unknown>) => string;
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export interface TranslationService {
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locale: Writable<string>;
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translate: Readable<TType>;
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}
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export class I18NextTranslationService implements TranslationService {
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public locale: Writable<string>;
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public translate: Readable<TType>;
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constructor(i18n: I18nService) {
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i18n.initialize();
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this.locale = this.createLocale(i18n);
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this.translate = this.createTranslate(i18n);
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}
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// Locale initialization.
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// 1. Create a writable store
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// 2. Create a new set function that changes the i18n locale.
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// 3. Create a new update function that changes the i18n locale.
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// 4. Return modified writable.
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// skipcq: JS-0105
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private createLocale(i18n: I18nService) {
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const { subscribe, set, update } = writable<string>(i18n.i18n.language);
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const setLocale = (newLocale: string) => {
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i18n.changeLanguage(newLocale);
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set(newLocale);
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};
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// eslint-disable-next-line no-unused-vars
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const updateLocale = (updater: (value: string) => string) => {
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update((currentValue) => {
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const nextLocale = updater(currentValue);
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i18n.changeLanguage(nextLocale);
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return nextLocale;
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});
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};
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return {
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subscribe,
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update: updateLocale,
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set: setLocale
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};
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}
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// Create a translate function.
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// It is derived from the "locale" writable.
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// This means it will be updated every time the locale changes.
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private createTranslate(i18n: I18nService) {
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return derived([this.locale], () => {
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return (key: string, replacements?: Record<string, unknown>) =>
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i18n.t(key, replacements);
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});
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}
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}
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