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

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/mergeScan.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/mergeScan.ts
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+import { Operator } from '../Operator';
+import { Observable } from '../Observable';
+import { Subscriber } from '../Subscriber';
+import { Subscription } from '../Subscription';
+import { subscribeToResult } from '../util/subscribeToResult';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { ObservableInput, OperatorFunction } from '../types';
+
+/**
+ * Applies an accumulator function over the source Observable where the
+ * accumulator function itself returns an Observable, then each intermediate
+ * Observable returned is merged into the output Observable.
+ *
+ * <span class="informal">It's like {@link scan}, but the Observables returned
+ * by the accumulator are merged into the outer Observable.</span>
+ *
+ * ## Example
+ * Count the number of click events
+ * ```ts
+ * import { fromEvent, of } from 'rxjs';
+ * import { mapTo, mergeScan } from 'rxjs/operators';
+ *
+ * const click$ = fromEvent(document, 'click');
+ * const one$ = click$.pipe(mapTo(1));
+ * const seed = 0;
+ * const count$ = one$.pipe(
+ *   mergeScan((acc, one) => of(acc + one), seed),
+ * );
+ * count$.subscribe(x => console.log(x));
+ *
+ * // Results:
+ * // 1
+ * // 2
+ * // 3
+ * // 4
+ * // ...and so on for each click
+ * ```
+ *
+ * @param {function(acc: R, value: T): Observable<R>} accumulator
+ * The accumulator function called on each source value.
+ * @param seed The initial accumulation value.
+ * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of
+ * input Observables being subscribed to concurrently.
+ * @return {Observable<R>} An observable of the accumulated values.
+ * @method mergeScan
+ * @owner Observable
+ */
+export function mergeScan<T, R>(accumulator: (acc: R, value: T, index: number) => ObservableInput<R>,
+                                seed: R,
+                                concurrent: number = Number.POSITIVE_INFINITY): OperatorFunction<T, R> {
+  return (source: Observable<T>) => source.lift(new MergeScanOperator(accumulator, seed, concurrent));
+}
+
+export class MergeScanOperator<T, R> implements Operator<T, R> {
+  constructor(private accumulator: (acc: R, value: T, index: number) => ObservableInput<R>,
+              private seed: R,
+              private concurrent: number) {
+  }
+
+  call(subscriber: Subscriber<R>, source: any): any {
+    return source.subscribe(new MergeScanSubscriber(
+      subscriber, this.accumulator, this.seed, this.concurrent
+    ));
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class MergeScanSubscriber<T, R> extends OuterSubscriber<T, R> {
+  private hasValue: boolean = false;
+  private hasCompleted: boolean = false;
+  private buffer: Observable<any>[] = [];
+  private active: number = 0;
+  protected index: number = 0;
+
+  constructor(destination: Subscriber<R>,
+              private accumulator: (acc: R, value: T, index: number) => ObservableInput<R>,
+              private acc: R,
+              private concurrent: number) {
+    super(destination);
+  }
+
+  protected _next(value: any): void {
+    if (this.active < this.concurrent) {
+      const index = this.index++;
+      const destination = this.destination;
+      let ish;
+      try {
+        const { accumulator } = this;
+        ish = accumulator(this.acc, value, index);
+      } catch (e) {
+        return destination.error(e);
+      }
+      this.active++;
+      this._innerSub(ish, value, index);
+    } else {
+      this.buffer.push(value);
+    }
+  }
+
+  private _innerSub(ish: any, value: T, index: number): void {
+    const innerSubscriber = new InnerSubscriber(this, value, index);
+    const destination = this.destination as Subscription;
+    destination.add(innerSubscriber);
+    const innerSubscription = subscribeToResult<T, R>(this, ish, undefined, undefined, innerSubscriber);
+    // The returned subscription will usually be the subscriber that was
+    // passed. However, interop subscribers will be wrapped and for
+    // unsubscriptions to chain correctly, the wrapper needs to be added, too.
+    if (innerSubscription !== innerSubscriber) {
+      destination.add(innerSubscription);
+    }
+  }
+
+  protected _complete(): void {
+    this.hasCompleted = true;
+    if (this.active === 0 && this.buffer.length === 0) {
+      if (this.hasValue === false) {
+        this.destination.next(this.acc);
+      }
+      this.destination.complete();
+    }
+    this.unsubscribe();
+  }
+
+  notifyNext(outerValue: T, innerValue: R,
+             outerIndex: number, innerIndex: number,
+             innerSub: InnerSubscriber<T, R>): void {
+    const { destination } = this;
+    this.acc = innerValue;
+    this.hasValue = true;
+    destination.next(innerValue);
+  }
+
+  notifyComplete(innerSub: Subscription): void {
+    const buffer = this.buffer;
+    const destination = this.destination as Subscription;
+    destination.remove(innerSub);
+    this.active--;
+    if (buffer.length > 0) {
+      this._next(buffer.shift());
+    } else if (this.active === 0 && this.hasCompleted) {
+      if (this.hasValue === false) {
+        this.destination.next(this.acc);
+      }
+      this.destination.complete();
+    }
+  }
+}