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{ Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Observable } from '../Observable';\nimport { Subscription, TeardownLogic } from '../Subscription';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { MonoTypeOperatorFunction } from '../interfaces';\n\n/**\n * Delays the emission of items from the source Observable by a given time span\n * determined by the emissions of another Observable.\n *\n * <span class=\"informal\">It's like {@link delay}, but the time span of the\n * delay duration is determined by a second Observable.</span>\n *\n * <img src=\"./img/delayWhen.png\" width=\"100%\">\n *\n * `delayWhen` time shifts each emitted value from the source Observable by a\n * time span determined by another Observable. When the source emits a value,\n * the `delayDurationSelector` function is called with the source value as\n * argument, and should return an Observable, called the \"duration\" Observable.\n * The source value is emitted on the output Observable only when the duration\n * Observable emits a value or completes.\n *\n * Optionally, `delayWhen` takes a second argument, `subscriptionDelay`, which\n * is an Observable. When `subscriptionDelay` emits its first value or\n * completes, the source Observable is subscribed to and starts behaving like\n * described in the previous paragraph. If `subscriptionDelay` is not provided,\n * `delayWhen` will subscribe to the source Observable as soon as the output\n * Observable is subscribed.\n *\n * @example <caption>Delay each click by a random amount of time, between 0 and 5 seconds</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var delayedClicks = clicks.delayWhen(event =>\n * Rx.Observable.interval(Math.random() * 5000)\n * );\n * delayedClicks.subscribe(x => console.log(x));\n *\n * @see {@link debounce}\n * @see {@link delay}\n *\n * @param {function(value: T): Observable} delayDurationSelector A function that\n * returns an Observable for each value emitted by the source Observable, which\n * is then used to delay the emission of that item on the output Observable\n * until the Observable returned from this function emits a value.\n * @param {Observable} subscriptionDelay An Observable that triggers the\n * subscription to the source Observable once it emits any value.\n * @return {Observable} An Observable that delays the emissions of the source\n * Observable by an amount of time specified by the Observable returned by\n * `delayDurationSelector`.\n * @method delayWhen\n * @owner Observable\n */\nexport function delayWhen<T>(delayDurationSelector: (value: T) => Observable<any>,\n subscriptionDelay?: Observable<any>): MonoTypeOperatorFunction<T> {\n if (subscriptionDelay) {\n return (source: Observable<T>) =>\n new SubscriptionDelayObservable(source, subscriptionDelay)\n .lift(new DelayWhenOperator(delayDurationSelector));\n }\n return (source: Observable<T>) => source.lift(new DelayWhenOperator(delayDurationSelector));\n}\n\nclass DelayWhenOperator<T> implements Operator<T, T> {\n constructor(private delayDurationSelector: (value: T) => Observable<any>) {\n }\n\n call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n return source.subscribe(new DelayWhenSubscriber(subscriber, this.delayDurationSelector));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass DelayWhenSubscriber<T, R> extends OuterSubscriber<T, R> {\n private completed: boolean = false;\n private delayNotifierSubscriptions: Array<Subscription> = [];\n private values: Array<T> = [];\n\n constructor(destination: Subscriber<T>,\n private delayDurationSelector: (value: T) => Observable<any>) {\n super(destination);\n }\n\n notifyNext(outerValue: T, innerValue: any,\n outerIndex: number, innerIndex: number,\n innerSub: InnerSubscriber<T, R>): void {\n this.destination.next(outerValue);\n this.removeSubscription(innerSub);\n this.tryComplete();\n }\n\n notifyError(error: any, innerSub: InnerSubscriber<T, R>): void {\n this._error(error);\n }\n\n notifyComplete(innerSub: InnerSubscriber<T, R>): void {\n const value = this.removeSubscription(innerSub);\n if (value) {\n this.destination.next(value);\n }\n this.tryComplete();\n }\n\n protected _next(value: T): void {\n try {\n const delayNotifier = this.delayDurationSelector(value);\n if (delayNotifier) {\n this.tryDelay(delayNotifier, value);\n }\n } catch (err) {\n this.destination.error(err);\n }\n }\n\n protected _complete(): void {\n this.completed = true;\n this.tryComplete();\n }\n\n private removeSubscription(subscription: InnerSubscriber<T, R>): T {\n subscription.unsubscribe();\n\n const subscriptionIdx = this.delayNotifierSubscriptions.indexOf(subscription);\n let value: T = null;\n\n if (subscriptionIdx !== -1) {\n value = this.values[subscriptionIdx];\n this.delayNotifierSubscriptions.splice(subscriptionIdx, 1);\n this.values.splice(subscriptionIdx, 1);\n }\n\n return value;\n }\n\n private tryDelay(delayNotifier: Observable<any>, value: T): void {\n const notifierSubscription = subscribeToResult(this, delayNotifier, value);\n\n if (notifierSubscription && !notifierSubscription.closed) {\n this.add(notifierSubscription);\n this.delayNotifierSubscriptions.push(notifierSubscription);\n }\n\n this.values.push(value);\n }\n\n private tryComplete(): void {\n if (this.completed && this.delayNotifierSubscriptions.length === 0) {\n this.destination.complete();\n }\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass SubscriptionDelayObservable<T> extends Observable<T> {\n constructor(/** @deprecated internal use only */ public source: Observable<T>, private subscriptionDelay: Observable<any>) {\n super();\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>) {\n this.subscriptionDelay.subscribe(new SubscriptionDelaySubscriber(subscriber, this.source));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass SubscriptionDelaySubscriber<T> extends Subscriber<T> {\n private sourceSubscribed: boolean = false;\n\n constructor(private parent: Subscriber<T>, private source: Observable<T>) {\n super();\n }\n\n protected _next(unused: any) {\n this.subscribeToSource();\n }\n\n protected _error(err: any) {\n this.unsubscribe();\n this.parent.error(err);\n }\n\n protected _complete() {\n this.subscribeToSource();\n }\n\n private subscribeToSource(): void {\n if (!this.sourceSubscribed) {\n this.sourceSubscribed = true;\n this.unsubscribe();\n this.source.subscribe(this.parent);\n }\n }\n}\n"]}
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