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Localization: Fallback to English when missing translation and while loading

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This commit is contained in:
Alexander Zinchuk 2021-06-30 00:23:11 +03:00
parent 4e558131eb
commit 92b79ce62a
3 changed files with 1736 additions and 14 deletions
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2
src/modules/actions/ui/initial.ts
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@ -14,7 +14,7 @@ addReducer('init', (global) => {
const { animationLevel, messageTextSize, language } = global.settings.byKey;
const theme = selectTheme(global);
setLanguage(language);
setLanguage(language, undefined, true);
document.documentElement.style.setProperty('--message-text-size', `${messageTextSize}px`);
document.body.classList.add('initial');

1704
src/util/fallbackLangPack.ts Normal file
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File diff suppressed because it is too large Load Diff

44
src/util/langProvider.ts
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@ -13,6 +13,7 @@ interface LangFn {
isRtl?: boolean;
}
const FALLBACK_LANG_CODE = 'en';
const PLURAL_OPTIONS = ['value', 'zeroValue', 'oneValue', 'twoValue', 'fewValue', 'manyValue', 'otherValue'] as const;
const PLURAL_RULES = {
/* eslint-disable max-len */
@ -39,7 +40,8 @@ const PLURAL_RULES = {
const cache = new Map<string, string>();
let langPack: ApiLangPack;
let langPack: ApiLangPack | undefined;
let fallbackLangPack: ApiLangPack | undefined;
const {
addCallback,
@ -59,12 +61,16 @@ export const getTranslation: LangFn = (key: string, value?: any, format?: 'i') =
}
}
if (!langPack) {
if (!langPack && !fallbackLangPack) {
return key;
}
const langString = langPack[key];
const langString = (langPack && langPack[key]) || (fallbackLangPack && fallbackLangPack[key]);
if (!langString) {
if (!fallbackLangPack) {
void importFallbackLangPack();
}
return key;
}
@ -85,7 +91,7 @@ export const getTranslation: LangFn = (key: string, value?: any, format?: 'i') =
return template;
};
export async function setLanguage(langCode: string, callback?: NoneToVoidFunction) {
export async function setLanguage(langCode: string, callback?: NoneToVoidFunction, withFallback = false) {
if (langPack && langCode === currentLangCode) {
if (callback) {
callback();
@ -94,9 +100,16 @@ export async function setLanguage(langCode: string, callback?: NoneToVoidFunctio
return;
}
const newLangPack = await fetchFromCacheOrRemote(langCode);
let newLangPack = await cacheApi.fetch(LANG_CACHE_NAME, langCode, cacheApi.Type.Json);
if (!newLangPack) {
return;
if (withFallback) {
await importFallbackLangPack();
}
newLangPack = await fetchRemote(langCode);
if (!newLangPack) {
return;
}
}
cache.clear();
@ -113,15 +126,19 @@ export async function setLanguage(langCode: string, callback?: NoneToVoidFunctio
callback();
}
runCallbacks(langPack);
runCallbacks();
}
async function fetchFromCacheOrRemote(langCode: string): Promise<ApiLangPack | undefined> {
const cached = await cacheApi.fetch(LANG_CACHE_NAME, langCode, cacheApi.Type.Json);
if (cached) {
return cached;
async function importFallbackLangPack() {
if (fallbackLangPack) {
return;
}
fallbackLangPack = (await import('./fallbackLangPack')).default;
runCallbacks();
}
async function fetchRemote(langCode: string): Promise<ApiLangPack | undefined> {
const remote = await callApi('fetchLangPack', { sourceLangPacks: LANG_PACKS, langCode });
if (remote) {
await cacheApi.save(LANG_CACHE_NAME, langCode, remote.langPack);
@ -132,8 +149,9 @@ async function fetchFromCacheOrRemote(langCode: string): Promise<ApiLangPack | u
}
function getPluralOption(amount: number) {
const optionIndex = currentLangCode && PLURAL_RULES[currentLangCode as keyof typeof PLURAL_RULES]
? PLURAL_RULES[currentLangCode as keyof typeof PLURAL_RULES](amount)
const langCode = currentLangCode || FALLBACK_LANG_CODE;
const optionIndex = PLURAL_RULES[langCode as keyof typeof PLURAL_RULES]
? PLURAL_RULES[langCode as keyof typeof PLURAL_RULES](amount)
: 0;
return PLURAL_OPTIONS[optionIndex];