NlsBundle.ts
73 lines
| 2.1 KiB
| video/mp2t
|
TypeScriptLexer
cin
|
r65 | import { MapOf, PromiseOrValue } from "@implab/core-amd/interfaces"; | ||
| import { argumentNotEmptyString, isPromise, mixin } from "@implab/core-amd/safe"; | ||||
| export type LocaleProvider<T> = () => PromiseOrValue<T | { default: T }>; | ||||
| type ResolveCallback<T> = () => PromiseOrValue<T>; | ||||
| function when<T, T2>(value: PromiseOrValue<T>, cb: (v: T) => PromiseOrValue<T2>): PromiseOrValue<T2> { | ||||
| return isPromise(value) ? | ||||
| value.then(cb) : | ||||
| cb(value); | ||||
| } | ||||
| function isCallback<T>(v: ResolveCallback<T> | PromiseOrValue<T>): v is ResolveCallback<T> { | ||||
| return typeof v === "function"; | ||||
| } | ||||
| function chainObjects<T extends object>(o1: T, o2: T) { | ||||
| if (!o1) | ||||
| return o2; | ||||
| if (!o2) | ||||
| return o1; | ||||
| return mixin(Object.create(o1) as T, o2); | ||||
| } | ||||
| export class NlsBundle<T extends object> { | ||||
| private _locales: MapOf<LocaleProvider<Partial<T>>>; | ||||
| private _default: T; | ||||
| private _cache: MapOf<PromiseOrValue<T>>; | ||||
| constructor(defNls: T, locales?: MapOf<LocaleProvider<Partial<T>>>) { | ||||
| this._default = defNls; | ||||
| this._locales = locales || {}; | ||||
| this._cache = {}; | ||||
| } | ||||
| getLocale(locale: string) { | ||||
| argumentNotEmptyString(locale, "locale"); | ||||
| const _loc = locale; | ||||
| // en-US => ["en", "en-US"] | ||||
| const locales = _loc.split(/-|_/).map((x, i, a) => a.slice(0, i + 1).join("-")); | ||||
| return this._resolveLocale(locales); | ||||
| } | ||||
| _resolveLocale(locales: string[]): PromiseOrValue<T> { | ||||
| if (!locales.length) | ||||
| return this._default; | ||||
| const locale = locales.pop(); | ||||
| if (!locale) | ||||
| throw new Error("The locale can't be empty"); | ||||
| if (this._cache[locale]) | ||||
| return this._cache[locale]; | ||||
| const data = this._loadPackage(this._locales[locale]); | ||||
| const parent = this._resolveLocale(locales); | ||||
| return this._cache[locale] = when(data, x => { | ||||
| return when(parent, y => this._cache[locale] = chainObjects(y, x)); | ||||
| }); | ||||
| } | ||||
| _loadPackage(localeData: any) { | ||||
| if (isCallback(localeData)) | ||||
| return when(localeData(), data => data && "default" in data ? data.default : data); | ||||
| return localeData; | ||||
| } | ||||
| } | ||||