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

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/distinctUntilChanged.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/distinctUntilChanged.ts
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+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { Observable } from '../Observable';
+import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
+
+/* tslint:disable:max-line-length */
+export function distinctUntilChanged<T>(compare?: (x: T, y: T) => boolean): MonoTypeOperatorFunction<T>;
+export function distinctUntilChanged<T, K>(compare: (x: K, y: K) => boolean, keySelector: (x: T) => K): MonoTypeOperatorFunction<T>;
+/* tslint:enable:max-line-length */
+
+/**
+ * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item.
+ *
+ * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
+ *
+ * If a comparator function is not provided, an equality check is used by default.
+ *
+ * ## Example
+ * A simple example with numbers
+ * ```ts
+ * import { of } from 'rxjs';
+ * import { distinctUntilChanged } from 'rxjs/operators';
+ *
+ * of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4).pipe(
+ *     distinctUntilChanged(),
+ *   )
+ *   .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4
+ * ```
+ *
+ * An example using a compare function
+ * ```typescript
+ * import { of } from 'rxjs';
+ * import { distinctUntilChanged } from 'rxjs/operators';
+ *
+ * interface Person {
+ *    age: number,
+ *    name: string
+ * }
+ *
+ * of<Person>(
+ *     { age: 4, name: 'Foo'},
+ *     { age: 7, name: 'Bar'},
+ *     { age: 5, name: 'Foo'},
+ *     { age: 6, name: 'Foo'},
+ *   ).pipe(
+ *     distinctUntilChanged((p: Person, q: Person) => p.name === q.name),
+ *   )
+ *   .subscribe(x => console.log(x));
+ *
+ * // displays:
+ * // { age: 4, name: 'Foo' }
+ * // { age: 7, name: 'Bar' }
+ * // { age: 5, name: 'Foo' }
+ * ```
+ *
+ * @see {@link distinct}
+ * @see {@link distinctUntilKeyChanged}
+ *
+ * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
+ * @return {Observable} An Observable that emits items from the source Observable with distinct values.
+ * @method distinctUntilChanged
+ * @owner Observable
+ */
+export function distinctUntilChanged<T, K>(compare?: (x: K, y: K) => boolean, keySelector?: (x: T) => K): MonoTypeOperatorFunction<T> {
+  return (source: Observable<T>) => source.lift(new DistinctUntilChangedOperator<T, K>(compare, keySelector));
+}
+
+class DistinctUntilChangedOperator<T, K> implements Operator<T, T> {
+  constructor(private compare: (x: K, y: K) => boolean,
+              private keySelector: (x: T) => K) {
+  }
+
+  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+    return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class DistinctUntilChangedSubscriber<T, K> extends Subscriber<T> {
+  private key: K;
+  private hasKey: boolean = false;
+
+  constructor(destination: Subscriber<T>,
+              compare: (x: K, y: K) => boolean,
+              private keySelector: (x: T) => K) {
+    super(destination);
+    if (typeof compare === 'function') {
+      this.compare = compare;
+    }
+  }
+
+  private compare(x: any, y: any): boolean {
+    return x === y;
+  }
+
+  protected _next(value: T): void {
+    let key: any;
+    try {
+      const { keySelector } = this;
+      key = keySelector ? keySelector(value) : value;
+    } catch (err) {
+      return this.destination.error(err);
+    }
+    let result = false;
+    if (this.hasKey) {
+      try {
+        const { compare } = this;
+        result = compare(this.key, key);
+      } catch (err) {
+        return this.destination.error(err);
+      }
+    } else {
+      this.hasKey = true;
+    }
+    if (!result) {
+      this.key = key;
+      this.destination.next(value);
+    }
+  }
+}