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

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/throttle.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/throttle.ts
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+import { Operator } from '../Operator';
+import { Observable } from '../Observable';
+import { Subscriber } from '../Subscriber';
+import { Subscription } from '../Subscription';
+
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+
+import { MonoTypeOperatorFunction, SubscribableOrPromise, TeardownLogic } from '../types';
+
+export interface ThrottleConfig {
+  leading?: boolean;
+  trailing?: boolean;
+}
+
+export const defaultThrottleConfig: ThrottleConfig = {
+  leading: true,
+  trailing: false
+};
+
+/**
+ * Emits a value from the source Observable, then ignores subsequent source
+ * values for a duration determined by another Observable, then repeats this
+ * process.
+ *
+ * <span class="informal">It's like {@link throttleTime}, but the silencing
+ * duration is determined by a second Observable.</span>
+ *
+ * ![](throttle.png)
+ *
+ * `throttle` emits the source Observable values on the output Observable
+ * when its internal timer is disabled, and ignores source values when the timer
+ * is enabled. Initially, the timer is disabled. As soon as the first source
+ * value arrives, it is forwarded to the output Observable, and then the timer
+ * is enabled by calling the `durationSelector` function with the source value,
+ * which returns the "duration" Observable. When the duration Observable emits a
+ * value or completes, the timer is disabled, and this process repeats for the
+ * next source value.
+ *
+ * ## Example
+ * Emit clicks at a rate of at most one click per second
+ * ```ts
+ * import { fromEvent } from 'rxjs';
+ * import { throttle } from 'rxjs/operators';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const result = clicks.pipe(throttle(ev => interval(1000)));
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link audit}
+ * @see {@link debounce}
+ * @see {@link delayWhen}
+ * @see {@link sample}
+ * @see {@link throttleTime}
+ *
+ * @param {function(value: T): SubscribableOrPromise} durationSelector A function
+ * that receives a value from the source Observable, for computing the silencing
+ * duration for each source value, returned as an Observable or a Promise.
+ * @param {Object} config a configuration object to define `leading` and `trailing` behavior. Defaults
+ * to `{ leading: true, trailing: false }`.
+ * @return {Observable<T>} An Observable that performs the throttle operation to
+ * limit the rate of emissions from the source.
+ * @method throttle
+ * @owner Observable
+ */
+export function throttle<T>(durationSelector: (value: T) => SubscribableOrPromise<any>,
+                            config: ThrottleConfig = defaultThrottleConfig): MonoTypeOperatorFunction<T> {
+  return (source: Observable<T>) => source.lift(new ThrottleOperator(durationSelector, config.leading, config.trailing));
+}
+
+class ThrottleOperator<T> implements Operator<T, T> {
+  constructor(private durationSelector: (value: T) => SubscribableOrPromise<any>,
+              private leading: boolean,
+              private trailing: boolean) {
+  }
+
+  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+    return source.subscribe(
+      new ThrottleSubscriber(subscriber, this.durationSelector, this.leading, this.trailing)
+    );
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc
+ * @ignore
+ * @extends {Ignored}
+ */
+class ThrottleSubscriber<T, R> extends OuterSubscriber<T, R> {
+  private _throttled: Subscription;
+  private _sendValue: T;
+  private _hasValue = false;
+
+  constructor(protected destination: Subscriber<T>,
+              private durationSelector: (value: T) => SubscribableOrPromise<number>,
+              private _leading: boolean,
+              private _trailing: boolean) {
+    super(destination);
+  }
+
+  protected _next(value: T): void {
+    this._hasValue = true;
+    this._sendValue = value;
+
+    if (!this._throttled) {
+      if (this._leading) {
+        this.send();
+      } else {
+        this.throttle(value);
+      }
+    }
+  }
+
+  private send() {
+    const { _hasValue, _sendValue } = this;
+    if (_hasValue) {
+      this.destination.next(_sendValue);
+      this.throttle(_sendValue);
+    }
+    this._hasValue = false;
+    this._sendValue = null;
+  }
+
+  private throttle(value: T): void {
+    const duration = this.tryDurationSelector(value);
+    if (!!duration) {
+      this.add(this._throttled = subscribeToResult(this, duration));
+    }
+  }
+
+  private tryDurationSelector(value: T): SubscribableOrPromise<any> {
+    try {
+      return this.durationSelector(value);
+    } catch (err) {
+      this.destination.error(err);
+      return null;
+    }
+  }
+
+  private throttlingDone() {
+    const { _throttled, _trailing } = this;
+    if (_throttled) {
+      _throttled.unsubscribe();
+    }
+    this._throttled = null;
+
+    if (_trailing) {
+      this.send();
+    }
+  }
+
+  notifyNext(outerValue: T, innerValue: R,
+             outerIndex: number, innerIndex: number,
+             innerSub: InnerSubscriber<T, R>): void {
+    this.throttlingDone();
+  }
+
+  notifyComplete(): void {
+    this.throttlingDone();
+  }
+}