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{ AsyncIterableInput, AsyncIterableX } from './asynciterablex';\nimport { identityAsync } from '../util/identity';\nimport { bindCallback } from '../util/bindcallback';\nimport {\n isIterable,\n isAsyncIterable,\n isArrayLike,\n isIterator,\n isPromise,\n isObservable\n} from '../util/isiterable';\nimport { Observable } from '../observer';\nimport { toLength } from '../util/tolength';\nimport { AsyncSink } from './asyncsink';\n\nexport let from: <TSource, TResult = TSource>(\n source: AsyncIterableInput<TSource>,\n selector?: (value: TSource, index: number) => TResult | Promise<TResult>,\n thisArg?: any\n) => AsyncIterableX<TResult>;\n\nexport let FromArrayIterable: new <TSource, TResult = TSource>(\n source: ArrayLike<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n) => AsyncIterableX<TResult>;\n\nexport let FromAsyncIterable: new <TSource, TResult = TSource>(\n source: Iterable<TSource | PromiseLike<TSource>> | AsyncIterable<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n) => AsyncIterableX<TResult>;\n\nexport let FromPromiseIterable: new <TSource, TResult = TSource>(\n source: PromiseLike<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n) => AsyncIterableX<TResult>;\n\nexport let FromObservableAsyncIterable: new <TSource, TResult = TSource>(\n observable: Observable<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n) => AsyncIterableX<TResult>;\n\nexport function _initialize(Ctor: typeof AsyncIterableX) {\n /** @nocollapse */\n from = function<TSource, TResult = TSource> (\n source: AsyncIterableInput<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult> = identityAsync,\n thisArg?: any\n ): AsyncIterableX<TResult> {\n const fn = bindCallback(selector, thisArg, 2);\n if (isIterable(source) || isAsyncIterable(source)) {\n return new FromAsyncIterable<TSource, TResult>(source, fn);\n }\n if (isPromise(source)) {\n return new FromPromiseIterable<TSource, TResult>(source, fn);\n }\n if (isObservable(source)) {\n return new FromObservableAsyncIterable<TSource, TResult>(source, fn);\n }\n if (isArrayLike(source)) {\n return new FromArrayIterable<TSource, TResult>(source, fn);\n }\n if (isIterator(source)) {\n return new FromAsyncIterable<TSource, TResult>({ [Symbol.asyncIterator]: () => source }, fn);\n }\n throw new TypeError('Input type not supported');\n };\n\n // eslint-disable-next-line no-shadow\n FromArrayIterable = class FromArrayIterable<TSource, TResult = TSource> extends Ctor<TResult> {\n private _source: ArrayLike<TSource>;\n private _selector: (value: TSource, index: number) => TResult | Promise<TResult>;\n\n constructor(\n source: ArrayLike<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n ) {\n super();\n this._source = source;\n this._selector = selector;\n }\n\n async *[Symbol.asyncIterator]() {\n let i = 0;\n const length = toLength((<ArrayLike<TSource>> this._source).length);\n while (i < length) {\n yield await this._selector(this._source[i], i++);\n }\n }\n };\n\n // eslint-disable-next-line no-shadow\n FromAsyncIterable = class FromAsyncIterable<TSource, TResult = TSource> extends Ctor<TResult> {\n private _source: Iterable<TSource | PromiseLike<TSource>> | AsyncIterable<TSource>;\n private _selector: (value: TSource, index: number) => TResult | Promise<TResult>;\n\n constructor(\n source: Iterable<TSource | PromiseLike<TSource>> | AsyncIterable<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n ) {\n super();\n this._source = source;\n this._selector = selector;\n }\n\n async *[Symbol.asyncIterator]() {\n let i = 0;\n for await (const item of <AsyncIterable<TSource>> this._source) {\n yield await this._selector(item, i++);\n }\n }\n };\n\n // eslint-disable-next-line no-shadow\n FromPromiseIterable = class FromPromiseIterable<TSource, TResult = TSource> extends Ctor<\n TResult\n > {\n private _source: PromiseLike<TSource>;\n private _selector: (value: TSource, index: number) => TResult | Promise<TResult>;\n\n constructor(\n source: PromiseLike<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n ) {\n super();\n this._source = source;\n this._selector = selector;\n }\n\n async *[Symbol.asyncIterator]() {\n const item = await this._source;\n yield await this._selector(item, 0);\n }\n };\n\n // eslint-disable-next-line no-shadow\n FromObservableAsyncIterable = class FromObservableAsyncIterable<\n TSource,\n TResult = TSource\n > extends Ctor<TResult> {\n private _observable: Observable<TSource>;\n private _selector: (value: TSource, index: number) => TResult | Promise<TResult>;\n\n constructor(\n observable: Observable<TSource>,\n selector: (value: TSource, index: number) => TResult | Promise<TResult>\n ) {\n super();\n this._observable = observable;\n this._selector = selector;\n }\n\n async *[Symbol.asyncIterator]() {\n const sink: AsyncSink<TSource> = new AsyncSink<TSource>();\n const subscription = this._observable.subscribe({\n next(value: TSource) {\n sink.write(value);\n },\n error(err: any) {\n sink.error(err);\n },\n complete() {\n sink.end();\n }\n });\n\n let i = 0;\n try {\n for (let next; !(next = await sink.next()).done; ) {\n yield await this._selector(next.value!, i++);\n }\n } finally {\n subscription.unsubscribe();\n }\n }\n };\n}\n"]} |