| import { OuterSubscriber } from '../OuterSubscriber'; |
| import { subscribeToResult } from '../util/subscribeToResult'; |
| export function expand(project, concurrent = Number.POSITIVE_INFINITY, scheduler = undefined) { |
| concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent; |
| return (source) => source.lift(new ExpandOperator(project, concurrent, scheduler)); |
| } |
| export class ExpandOperator { |
| constructor(project, concurrent, scheduler) { |
| this.project = project; |
| this.concurrent = concurrent; |
| this.scheduler = scheduler; |
| } |
| call(subscriber, source) { |
| return source.subscribe(new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler)); |
| } |
| } |
| export class ExpandSubscriber extends OuterSubscriber { |
| constructor(destination, project, concurrent, scheduler) { |
| super(destination); |
| this.project = project; |
| this.concurrent = concurrent; |
| this.scheduler = scheduler; |
| this.index = 0; |
| this.active = 0; |
| this.hasCompleted = false; |
| if (concurrent < Number.POSITIVE_INFINITY) { |
| this.buffer = []; |
| } |
| } |
| static dispatch(arg) { |
| const { subscriber, result, value, index } = arg; |
| subscriber.subscribeToProjection(result, value, index); |
| } |
| _next(value) { |
| const destination = this.destination; |
| if (destination.closed) { |
| this._complete(); |
| return; |
| } |
| const index = this.index++; |
| if (this.active < this.concurrent) { |
| destination.next(value); |
| try { |
| const { project } = this; |
| const result = project(value, index); |
| if (!this.scheduler) { |
| this.subscribeToProjection(result, value, index); |
| } |
| else { |
| const state = { subscriber: this, result, value, index }; |
| const destination = this.destination; |
| destination.add(this.scheduler.schedule(ExpandSubscriber.dispatch, 0, state)); |
| } |
| } |
| catch (e) { |
| destination.error(e); |
| } |
| } |
| else { |
| this.buffer.push(value); |
| } |
| } |
| subscribeToProjection(result, value, index) { |
| this.active++; |
| const destination = this.destination; |
| destination.add(subscribeToResult(this, result, value, index)); |
| } |
| _complete() { |
| this.hasCompleted = true; |
| if (this.hasCompleted && this.active === 0) { |
| this.destination.complete(); |
| } |
| this.unsubscribe(); |
| } |
| notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) { |
| this._next(innerValue); |
| } |
| notifyComplete(innerSub) { |
| const buffer = this.buffer; |
| const destination = this.destination; |
| destination.remove(innerSub); |
| this.active--; |
| if (buffer && buffer.length > 0) { |
| this._next(buffer.shift()); |
| } |
| if (this.hasCompleted && this.active === 0) { |
| this.destination.complete(); |
| } |
| } |
| } |
| //# sourceMappingURL=expand.js.map |