| import { subscribeToResult } from '../util/subscribeToResult'; |
| import { OuterSubscriber } from '../OuterSubscriber'; |
| import { InnerSubscriber } from '../InnerSubscriber'; |
| export function mergeScan(accumulator, seed, concurrent = Number.POSITIVE_INFINITY) { |
| return (source) => source.lift(new MergeScanOperator(accumulator, seed, concurrent)); |
| } |
| export class MergeScanOperator { |
| constructor(accumulator, seed, concurrent) { |
| this.accumulator = accumulator; |
| this.seed = seed; |
| this.concurrent = concurrent; |
| } |
| call(subscriber, source) { |
| return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent)); |
| } |
| } |
| export class MergeScanSubscriber extends OuterSubscriber { |
| constructor(destination, accumulator, acc, concurrent) { |
| super(destination); |
| this.accumulator = accumulator; |
| this.acc = acc; |
| this.concurrent = concurrent; |
| this.hasValue = false; |
| this.hasCompleted = false; |
| this.buffer = []; |
| this.active = 0; |
| this.index = 0; |
| } |
| _next(value) { |
| if (this.active < this.concurrent) { |
| const index = this.index++; |
| const destination = this.destination; |
| let ish; |
| try { |
| const { accumulator } = this; |
| ish = accumulator(this.acc, value, index); |
| } |
| catch (e) { |
| return destination.error(e); |
| } |
| this.active++; |
| this._innerSub(ish, value, index); |
| } |
| else { |
| this.buffer.push(value); |
| } |
| } |
| _innerSub(ish, value, index) { |
| const innerSubscriber = new InnerSubscriber(this, undefined, undefined); |
| const destination = this.destination; |
| destination.add(innerSubscriber); |
| subscribeToResult(this, ish, value, index, innerSubscriber); |
| } |
| _complete() { |
| this.hasCompleted = true; |
| if (this.active === 0 && this.buffer.length === 0) { |
| if (this.hasValue === false) { |
| this.destination.next(this.acc); |
| } |
| this.destination.complete(); |
| } |
| this.unsubscribe(); |
| } |
| notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) { |
| const { destination } = this; |
| this.acc = innerValue; |
| this.hasValue = true; |
| destination.next(innerValue); |
| } |
| notifyComplete(innerSub) { |
| const buffer = this.buffer; |
| const destination = this.destination; |
| destination.remove(innerSub); |
| this.active--; |
| if (buffer.length > 0) { |
| this._next(buffer.shift()); |
| } |
| else if (this.active === 0 && this.hasCompleted) { |
| if (this.hasValue === false) { |
| this.destination.next(this.acc); |
| } |
| this.destination.complete(); |
| } |
| } |
| } |
| //# sourceMappingURL=mergeScan.js.map |