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{ AsyncSink } from './../asyncsink';\nimport { OperatorAsyncFunction } from '../interfaces';\nimport { bindCallback } from '../internal/bindcallback';\nimport { identityAsync } from '../internal/identity';\nimport { toLength } from '../internal/tolength';\nimport { Observable } from '../observer';\nimport {\n isArrayLike,\n isIterable,\n isAsyncIterable,\n isReadableNodeStream,\n isWritableNodeStream\n} from '../internal/isiterable';\n\n/**\n * This class serves as the base for all operations which support [Symbol.asyncIterator].\n */\nexport abstract class AsyncIterableX<T> implements AsyncIterable<T> {\n abstract [Symbol.asyncIterator](): AsyncIterator<T>;\n\n async forEach(\n projection: (value: T, index: number) => void | Promise<void>,\n thisArg?: any\n ): Promise<void> {\n const fn = bindCallback(projection, thisArg, 2);\n let i = 0;\n for await (let item of this) {\n await fn(item, i++);\n }\n }\n\n pipe<R>(...args: OperatorAsyncFunction<any, any>[]): AsyncIterableX<R> {\n let i = -1;\n let n = args.length;\n let acc: any = this;\n let as = AsyncIterableX.as;\n while (++i < n) {\n acc = as(args[i](acc));\n }\n return acc as AsyncIterableX<R>;\n }\n\n tee(): [ReadableStream<T>, ReadableStream<T>] {\n return this._getDOMStream().tee();\n }\n\n pipeTo(writable: WritableStream<T>, options?: PipeOptions) {\n return this._getDOMStream().pipeTo(writable, options);\n }\n\n pipeThrough<R extends ReadableStream<any>>(\n duplex: { writable: WritableStream<T>; readable: R },\n options?: PipeOptions\n ) {\n return this._getDOMStream().pipeThrough(duplex, options);\n }\n\n private _DOMStream?: ReadableStream<T>;\n private _getDOMStream(): ReadableStream<T> {\n return this._DOMStream || (this._DOMStream = this.publish().toDOMStream());\n }\n\n static as(source: string): AsyncIterableX<string>;\n static as<T extends AsyncIterableX<any>>(source: T): T;\n static as<T>(source: AsyncIterableInput<T>): AsyncIterableX<T>;\n static as<T>(source: T): AsyncIterableX<T>;\n /** @nocollapse */\n static as(source: any) {\n /* tslint:disable */\n if (source instanceof AsyncIterableX) {\n return source;\n }\n if (typeof source === 'string') {\n return new OfAsyncIterable([source]);\n }\n if (isIterable(source) || isAsyncIterable(source)) {\n return new FromAsyncIterable(source, identityAsync);\n }\n if (isPromise(source)) {\n return new FromPromiseIterable(source, identityAsync);\n }\n if (isObservable(source)) {\n return new FromObservableAsyncIterable(source, identityAsync);\n }\n if (isArrayLike(source)) {\n return new FromArrayIterable(source, identityAsync);\n }\n return new OfAsyncIterable([source]);\n /* tslint:enable */\n }\n\n /** @nocollapse */\n static from<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 /* tslint:disable */\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 throw new TypeError('Input type not supported');\n /* tslint:enable */\n }\n\n /** @nocollapse */\n static of<TSource>(...args: TSource[]): AsyncIterableX<TSource> {\n //tslint:disable-next-line\n return new OfAsyncIterable<TSource>(args);\n }\n}\n\nclass FromArrayIterable<TSource, TResult = TSource> extends AsyncIterableX<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\nclass FromAsyncIterable<TSource, TResult = TSource> extends AsyncIterableX<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 (let item of <AsyncIterable<TSource>>this._source) {\n yield await this._selector(item, i++);\n }\n }\n}\n\nclass FromPromiseIterable<TSource, TResult = TSource> extends AsyncIterableX<TResult> {\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\nclass FromObservableAsyncIterable<TSource, TResult = TSource> extends AsyncIterableX<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\nexport type AsyncIterableInput<TSource> =\n | AsyncIterable<TSource>\n | Iterable<TSource | PromiseLike<TSource>>\n | ArrayLike<TSource>\n | PromiseLike<TSource>\n | Observable<TSource>;\n\nfunction isPromise(x: any): x is PromiseLike<any> {\n return x != null && Object(x) === x && typeof x['then'] === 'function';\n}\n\nfunction isObservable(x: any): x is Observable<any> {\n return x != null && Object(x) === x && typeof x['subscribe'] === 'function';\n}\n\nclass OfAsyncIterable<TSource> extends AsyncIterableX<TSource> {\n private _args: TSource[];\n\n constructor(args: TSource[]) {\n super();\n 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OperatorAsyncFunction<T, A>,\n op2: OperatorAsyncFunction<A, B>,\n op3: OperatorAsyncFunction<B, C>,\n op4: OperatorAsyncFunction<C, D>,\n op5: OperatorAsyncFunction<D, E>\n ): AsyncIterableX<E>;\n pipe<A, B, C, D, E, F>(\n op1: OperatorAsyncFunction<T, A>,\n op2: OperatorAsyncFunction<A, B>,\n op3: OperatorAsyncFunction<B, C>,\n op4: OperatorAsyncFunction<C, D>,\n op5: OperatorAsyncFunction<D, E>,\n op6: OperatorAsyncFunction<E, F>\n ): AsyncIterableX<F>;\n pipe<A, B, C, D, E, F, G>(\n op1: OperatorAsyncFunction<T, A>,\n op2: OperatorAsyncFunction<A, B>,\n op3: OperatorAsyncFunction<B, C>,\n op4: OperatorAsyncFunction<C, D>,\n op5: OperatorAsyncFunction<D, E>,\n op6: OperatorAsyncFunction<E, F>,\n op7: OperatorAsyncFunction<F, G>\n ): AsyncIterableX<G>;\n pipe<A, B, C, D, E, F, G, H>(\n op1: OperatorAsyncFunction<T, A>,\n op2: OperatorAsyncFunction<A, B>,\n op3: OperatorAsyncFunction<B, C>,\n op4: OperatorAsyncFunction<C, D>,\n op5: OperatorAsyncFunction<D, E>,\n op6: OperatorAsyncFunction<E, F>,\n op7: OperatorAsyncFunction<F, G>,\n op8: OperatorAsyncFunction<G, H>\n ): AsyncIterableX<H>;\n pipe<A, B, C, D, E, F, G, H, I>(\n op1: OperatorAsyncFunction<T, A>,\n op2: OperatorAsyncFunction<A, B>,\n op3: OperatorAsyncFunction<B, C>,\n op4: OperatorAsyncFunction<C, D>,\n op5: OperatorAsyncFunction<D, E>,\n op6: OperatorAsyncFunction<E, F>,\n op7: OperatorAsyncFunction<F, G>,\n op8: OperatorAsyncFunction<G, H>,\n op9: OperatorAsyncFunction<H, I>\n ): AsyncIterableX<I>;\n pipe(...operations: OperatorAsyncFunction<any, any>[]): AsyncIterableX<{}>;\n }\n}\n\ntry {\n (isBrowser => {\n if (isBrowser) {\n return;\n }\n\n const as = AsyncIterableX.as;\n AsyncIterableX.prototype.pipe = nodePipe;\n const readableOpts = (x: any, opts = x._writableState || { objectMode: true }) => opts;\n\n function nodePipe<T>(this: AsyncIterableX<T>, ...args: any[]) {\n let i = -1;\n let end: boolean;\n let n = args.length;\n let prev: any = this;\n let next: WritableOrOperatorAsyncFunction<T, any>;\n while (++i < n) {\n next = args[i];\n if (typeof next === 'function') {\n prev = as(next(prev));\n } else if (isWritableNodeStream(next)) {\n ({ end = true } = args[i + 1] || {});\n // prettier-ignore\n return isReadableNodeStream(prev) ? prev.pipe(next, {end}) :\n prev.toNodeStream(readableOpts(next)).pipe(next, {end});\n }\n }\n return prev;\n }\n })(typeof window === 'object' && typeof document === 'object' && document.nodeType === 9);\n} catch (e) {\n /* */\n}\n"]} |