NlsBundle.ts
60 lines
| 1.9 KiB
| video/mp2t
|
TypeScriptLexer
cin
|
r65 | import { MapOf, PromiseOrValue } from "@implab/core-amd/interfaces"; | ||
import { argumentNotEmptyString, isPromise, mixin } from "@implab/core-amd/safe"; | ||||
cin
|
r120 | export type LocaleProvider<T> = () => PromiseOrValue<T | {default: T}>; | ||
cin
|
r65 | |||
function when<T, T2>(value: PromiseOrValue<T>, cb: (v: T) => PromiseOrValue<T2>): PromiseOrValue<T2> { | ||||
return isPromise(value) ? | ||||
value.then(cb) : | ||||
cb(value); | ||||
} | ||||
cin
|
r112 | const loadPackage = <T extends object>(localeData: LocaleProvider<Partial<T>> | undefined) => | ||
localeData ? | ||||
when(localeData(), data => data && "default" in data ? data.default : data) : | ||||
undefined; | ||||
const chainObjects = <T extends object>(o1: T, o2: Partial<T> | undefined): T => | ||||
o2 ? mixin(Object.create(o1) as T, o2) : o1; | ||||
cin
|
r109 | export class NlsBundle<T extends object> { | ||
private readonly _locales: MapOf<LocaleProvider<Partial<T>>>; | ||||
cin
|
r65 | |||
cin
|
r109 | private readonly _default: T; | ||
cin
|
r65 | |||
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]; | ||||
cin
|
r112 | const data = loadPackage(this._locales[locale]); | ||
cin
|
r65 | const parent = this._resolveLocale(locales); | ||
return this._cache[locale] = when(data, x => { | ||||
return when(parent, y => this._cache[locale] = chainObjects(y, x)); | ||||
}); | ||||
} | ||||
} | ||||