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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / rxjs / src / internal / operators / sample.ts

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+import { Operator } from '../Operator';
+import { Observable } from '../Observable';
+import { Subscriber } from '../Subscriber';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+
+import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
+
+/**
+ * Emits the most recently emitted value from the source Observable whenever
+ * another Observable, the `notifier`, emits.
+ *
+ * <span class="informal">It's like {@link sampleTime}, but samples whenever
+ * the `notifier` Observable emits something.</span>
+ *
+ * ![](sample.png)
+ *
+ * Whenever the `notifier` Observable emits a value or completes, `sample`
+ * looks at the source Observable and emits whichever value it has most recently
+ * emitted since the previous sampling, unless the source has not emitted
+ * anything since the previous sampling. The `notifier` is subscribed to as soon
+ * as the output Observable is subscribed.
+ *
+ * ## Example
+ * On every click, sample the most recent "seconds" timer
+ * ```ts
+ * import { fromEvent, interval } from 'rxjs';
+ * import { sample } from 'rxjs/operators';
+ *
+ * const seconds = interval(1000);
+ * const clicks = fromEvent(document, 'click');
+ * const result = seconds.pipe(sample(clicks));
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link audit}
+ * @see {@link debounce}
+ * @see {@link sampleTime}
+ * @see {@link throttle}
+ *
+ * @param {Observable<any>} notifier The Observable to use for sampling the
+ * source Observable.
+ * @return {Observable<T>} An Observable that emits the results of sampling the
+ * values emitted by the source Observable whenever the notifier Observable
+ * emits value or completes.
+ * @method sample
+ * @owner Observable
+ */
+export function sample<T>(notifier: Observable<any>): MonoTypeOperatorFunction<T> {
+  return (source: Observable<T>) => source.lift(new SampleOperator(notifier));
+}
+
+class SampleOperator<T> implements Operator<T, T> {
+  constructor(private notifier: Observable<any>) {
+  }
+
+  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+    const sampleSubscriber = new SampleSubscriber(subscriber);
+    const subscription = source.subscribe(sampleSubscriber);
+    subscription.add(subscribeToResult(sampleSubscriber, this.notifier));
+    return subscription;
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SampleSubscriber<T, R> extends OuterSubscriber<T, R> {
+  private value: T;
+  private hasValue: boolean = false;
+
+  protected _next(value: T) {
+    this.value = value;
+    this.hasValue = true;
+  }
+
+  notifyNext(outerValue: T, innerValue: R,
+             outerIndex: number, innerIndex: number,
+             innerSub: InnerSubscriber<T, R>): void {
+    this.emitValue();
+  }
+
+  notifyComplete(): void {
+    this.emitValue();
+  }
+
+  emitValue() {
+    if (this.hasValue) {
+      this.hasValue = false;
+      this.destination.next(this.value);
+    }
+  }
+}