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PATH: usr / local / lib / node_modules / ghost-cli / node_modules / rxjs / src / internal / operators

import { Operator } from '../Operator';
import { Observable } from '../Observable';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { MonoTypeOperatorFunction, SubscribableOrPromise, TeardownLogic } from '../types';

import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';

/**
 * Emits a value from the source Observable only after a particular time span
 * determined by another Observable has passed without another source emission.
 *
 * <span class="informal">It's like {@link debounceTime}, but the time span of
 * emission silence is determined by a second Observable.</span>
 *
 * ![](debounce.png)
 *
 * `debounce` delays values emitted by the source Observable, but drops previous
 * pending delayed emissions if a new value arrives on the source Observable.
 * This operator keeps track of the most recent value from the source
 * Observable, and spawns a duration Observable by calling the
 * `durationSelector` function. The value is emitted only when the duration
 * Observable emits a value or completes, and if no other value was emitted on
 * the source Observable since the duration Observable was spawned. If a new
 * value appears before the duration Observable emits, the previous value will
 * be dropped and will not be emitted on the output Observable.
 *
 * Like {@link debounceTime}, this is a rate-limiting operator, and also a
 * delay-like operator since output emissions do not necessarily occur at the
 * same time as they did on the source Observable.
 *
 * ## Example
 * Emit the most recent click after a burst of clicks
 * ```ts
 * import { fromEvent, interval } from 'rxjs';
 * import { debounce } from 'rxjs/operators';
 *
 * const clicks = fromEvent(document, 'click');
 * const result = clicks.pipe(debounce(() => interval(1000)));
 * result.subscribe(x => console.log(x));
 * ```
 *
 * @see {@link audit}
 * @see {@link debounceTime}
 * @see {@link delayWhen}
 * @see {@link throttle}
 *
 * @param {function(value: T): SubscribableOrPromise} durationSelector A function
 * that receives a value from the source Observable, for computing the timeout
 * duration for each source value, returned as an Observable or a Promise.
 * @return {Observable} An Observable that delays the emissions of the source
 * Observable by the specified duration Observable returned by
 * `durationSelector`, and may drop some values if they occur too frequently.
 * @method debounce
 * @owner Observable
 */
export function debounce<T>(durationSelector: (value: T) => SubscribableOrPromise<any>): MonoTypeOperatorFunction<T> {
  return (source: Observable<T>) => source.lift(new DebounceOperator(durationSelector));
}

class DebounceOperator<T> implements Operator<T, T> {
  constructor(private durationSelector: (value: T) => SubscribableOrPromise<any>) {
  }

call(subscriber: Subscriber<T>, source: any): TeardownLogic {
    return source.subscribe(new DebounceSubscriber(subscriber, this.durationSelector));
  }
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class DebounceSubscriber<T, R> extends OuterSubscriber<T, R> {
  private value: T;
  private hasValue: boolean = false;
  private durationSubscription: Subscription = null;

constructor(destination: Subscriber<R>,
              private durationSelector: (value: T) => SubscribableOrPromise<any>) {
    super(destination);
  }

protected _next(value: T): void {
    try {
      const result = this.durationSelector.call(this, value);

if (result) {
        this._tryNext(value, result);
      }
    } catch (err) {
      this.destination.error(err);
    }
  }

protected _complete(): void {
    this.emitValue();
    this.destination.complete();
  }

private _tryNext(value: T, duration: SubscribableOrPromise<any>): void {
    let subscription = this.durationSubscription;
    this.value = value;
    this.hasValue = true;
    if (subscription) {
      subscription.unsubscribe();
      this.remove(subscription);
    }

subscription = subscribeToResult(this, duration);
    if (subscription && !subscription.closed) {
      this.add(this.durationSubscription = subscription);
    }
  }

notifyNext(outerValue: T, innerValue: R,
             outerIndex: number, innerIndex: number,
             innerSub: InnerSubscriber<T, R>): void {
    this.emitValue();
  }

notifyComplete(): void {
    this.emitValue();
  }

emitValue(): void {
    if (this.hasValue) {
      const value = this.value;
      const subscription = this.durationSubscription;
      if (subscription) {
        this.durationSubscription = null;
        subscription.unsubscribe();
        this.remove(subscription);
      }
      // This must be done *before* passing the value
      // along to the destination because it's possible for
      // the value to synchronously re-enter this operator
      // recursively if the duration selector Observable
      // emits synchronously
      this.value = null;
      this.hasValue = false;
      super._next(value);
    }
  }
}

[-] toArray.ts [edit]
[-] window.ts [edit]
[-] retry.ts [edit]
[-] mergeAll.ts [edit]
[-] windowWhen.ts [edit]
[-] every.ts [edit]
[-] timeout.ts [edit]
[-] debounceTime.ts [edit]
[-] index.ts [edit]
[-] takeWhile.ts [edit]
[-] audit.ts [edit]
[-] reduce.ts [edit]
[-] mapTo.ts [edit]
[-] count.ts [edit]
[-] debounce.ts [edit]
[-] throwIfEmpty.ts [edit]
[-] auditTime.ts [edit]
[-] scan.ts [edit]
[-] switchAll.ts [edit]
[-] map.ts [edit]
[-] bufferCount.ts [edit]
[-] mergeScan.ts [edit]
[-] publish.ts [edit]
[-] min.ts [edit]
[+] ..
[-] publishReplay.ts [edit]
[-] bufferTime.ts [edit]
[-] share.ts [edit]
[-] repeat.ts [edit]
[-] distinct.ts [edit]
[-] concatMapTo.ts [edit]
[-] buffer.ts [edit]
[-] concatMap.ts [edit]
[-] max.ts [edit]
[-] partition.ts [edit]
[-] observeOn.ts [edit]
[-] bufferWhen.ts [edit]
[-] dematerialize.ts [edit]
[-] throttle.ts [edit]
[-] groupBy.ts [edit]
[-] withLatestFrom.ts [edit]
[-] exhaust.ts [edit]
[-] exhaustMap.ts [edit]
[-] retryWhen.ts [edit]
[-] zipAll.ts [edit]
[-] find.ts [edit]
[-] mergeMap.ts [edit]
[-] single.ts [edit]
[-] last.ts [edit]
[-] combineLatest.ts [edit]
[-] publishLast.ts [edit]
[-] pluck.ts [edit]
[-] pairwise.ts [edit]
[-] distinctUntilChanged.ts [edit]
[-] timeInterval.ts [edit]
[-] shareReplay.ts [edit]
[-] skipUntil.ts [edit]
[-] findIndex.ts [edit]
[-] windowToggle.ts [edit]
[-] startWith.ts [edit]
[-] timeoutWith.ts [edit]
[-] concat.ts [edit]
[-] materialize.ts [edit]
[-] timestamp.ts [edit]
[-] onErrorResumeNext.ts [edit]
[-] subscribeOn.ts [edit]
[-] takeUntil.ts [edit]
[-] skipLast.ts [edit]
[-] throttleTime.ts [edit]
[-] mergeMapTo.ts [edit]
[-] multicast.ts [edit]
[-] merge.ts [edit]
[-] takeLast.ts [edit]
[-] delayWhen.ts [edit]
[-] sampleTime.ts [edit]
[-] tap.ts [edit]
[-] take.ts [edit]
[-] sample.ts [edit]
[-] filter.ts [edit]
[-] skip.ts [edit]
[-] expand.ts [edit]
[-] publishBehavior.ts [edit]
[-] sequenceEqual.ts [edit]
[-] ignoreElements.ts [edit]
[-] catchError.ts [edit]
[-] endWith.ts [edit]
[-] refCount.ts [edit]
[-] windowCount.ts [edit]
[-] defaultIfEmpty.ts [edit]
[-] windowTime.ts [edit]
[-] switchMapTo.ts [edit]
[-] switchMap.ts [edit]
[-] delay.ts [edit]
[-] bufferToggle.ts [edit]
[-] repeatWhen.ts [edit]
[-] concatAll.ts [edit]
[-] first.ts [edit]
[-] zip.ts [edit]
[-] elementAt.ts [edit]
[-] skipWhile.ts [edit]
[-] race.ts [edit]
[-] finalize.ts [edit]
[-] combineAll.ts [edit]
[-] distinctUntilKeyChanged.ts [edit]
[-] isEmpty.ts [edit]