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

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/distinct.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/distinct.ts
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+import { Observable } from '../Observable';
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
+
+/**
+ * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from previous items.
+ *
+ * If a keySelector function is provided, then it will project each value from the source observable into a new value that it will
+ * check for equality with previously projected values. If a keySelector function is not provided, it will use each value from the
+ * source observable directly with an equality check against previous values.
+ *
+ * In JavaScript runtimes that support `Set`, this operator will use a `Set` to improve performance of the distinct value checking.
+ *
+ * In other runtimes, this operator will use a minimal implementation of `Set` that relies on an `Array` and `indexOf` under the
+ * hood, so performance will degrade as more values are checked for distinction. Even in newer browsers, a long-running `distinct`
+ * use might result in memory leaks. To help alleviate this in some scenarios, an optional `flushes` parameter is also provided so
+ * that the internal `Set` can be "flushed", basically clearing it of values.
+ *
+ * ## Examples
+ * A simple example with numbers
+ * ```ts
+ * import { of } from 'rxjs';
+ * import { distinct } from 'rxjs/operators';
+ *
+ * of(1, 1, 2, 2, 2, 1, 2, 3, 4, 3, 2, 1).pipe(
+ *     distinct(),
+ *   )
+ *   .subscribe(x => console.log(x)); // 1, 2, 3, 4
+ * ```
+ *
+ * An example using a keySelector function
+ * ```typescript
+ * import { of } from 'rxjs';
+ * import { distinct } from 'rxjs/operators';
+ *
+ * interface Person {
+ *    age: number,
+ *    name: string
+ * }
+ *
+ * of<Person>(
+ *     { age: 4, name: 'Foo'},
+ *     { age: 7, name: 'Bar'},
+ *     { age: 5, name: 'Foo'},
+ *   ).pipe(
+ *     distinct((p: Person) => p.name),
+ *   )
+ *   .subscribe(x => console.log(x));
+ *
+ * // displays:
+ * // { age: 4, name: 'Foo' }
+ * // { age: 7, name: 'Bar' }
+ * ```
+ * @see {@link distinctUntilChanged}
+ * @see {@link distinctUntilKeyChanged}
+ *
+ * @param {function} [keySelector] Optional function to select which value you want to check as distinct.
+ * @param {Observable} [flushes] Optional Observable for flushing the internal HashSet of the operator.
+ * @return {Observable} An Observable that emits items from the source Observable with distinct values.
+ * @method distinct
+ * @owner Observable
+ */
+export function distinct<T, K>(keySelector?: (value: T) => K,
+                               flushes?: Observable<any>): MonoTypeOperatorFunction<T> {
+  return (source: Observable<T>) => source.lift(new DistinctOperator(keySelector, flushes));
+}
+
+class DistinctOperator<T, K> implements Operator<T, T> {
+  constructor(private keySelector: (value: T) => K, private flushes: Observable<any>) {
+  }
+
+  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+    return source.subscribe(new DistinctSubscriber(subscriber, this.keySelector, this.flushes));
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class DistinctSubscriber<T, K> extends OuterSubscriber<T, T> {
+  private values = new Set<K>();
+
+  constructor(destination: Subscriber<T>, private keySelector: (value: T) => K, flushes: Observable<any>) {
+    super(destination);
+
+    if (flushes) {
+      this.add(subscribeToResult(this, flushes));
+    }
+  }
+
+  notifyNext(outerValue: T, innerValue: T,
+             outerIndex: number, innerIndex: number,
+             innerSub: InnerSubscriber<T, T>): void {
+    this.values.clear();
+  }
+
+  notifyError(error: any, innerSub: InnerSubscriber<T, T>): void {
+    this._error(error);
+  }
+
+  protected _next(value: T): void {
+    if (this.keySelector) {
+      this._useKeySelector(value);
+    } else {
+      this._finalizeNext(value, value);
+    }
+  }
+
+  private _useKeySelector(value: T): void {
+    let key: K;
+    const { destination } = this;
+    try {
+      key = this.keySelector(value);
+    } catch (err) {
+      destination.error(err);
+      return;
+    }
+    this._finalizeNext(key, value);
+  }
+
+  private _finalizeNext(key: K|T, value: T) {
+    const { values } = this;
+    if (!values.has(<K>key)) {
+      values.add(<K>key);
+      this.destination.next(value);
+    }
+  }
+
+}