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

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/single.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/single.ts
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+import { Observable } from '../Observable';
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { EmptyError } from '../util/EmptyError';
+
+import { Observer, MonoTypeOperatorFunction, TeardownLogic } from '../types';
+
+/**
+ * Returns an Observable that emits the single item emitted by the source Observable that matches a specified
+ * predicate, if that Observable emits one such item. If the source Observable emits more than one such item or no
+ * items, notify of an IllegalArgumentException or NoSuchElementException respectively. If the source Observable
+ * emits items but none match the specified predicate then `undefined` is emitted.
+ *
+ * <span class="informal">Like {@link first}, but emit with error notification if there is more than one value.</span>
+ * ![](single.png)
+ *
+ * ## Example
+ * emits 'error'
+ * ```ts
+ * import { range } from 'rxjs';
+ * import { single } from 'rxjs/operators';
+ *
+ * const numbers = range(1,5).pipe(single());
+ * numbers.subscribe(x => console.log('never get called'), e => console.log('error'));
+ * // result
+ * // 'error'
+ * ```
+ *
+ * emits 'undefined'
+ * ```ts
+ * import { range } from 'rxjs';
+ * import { single } from 'rxjs/operators';
+ *
+ * const numbers = range(1,5).pipe(single(x => x === 10));
+ * numbers.subscribe(x => console.log(x));
+ * // result
+ * // 'undefined'
+ * ```
+ *
+ * @see {@link first}
+ * @see {@link find}
+ * @see {@link findIndex}
+ * @see {@link elementAt}
+ *
+ * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
+ * callback if the Observable completes before any `next` notification was sent.
+ * @param {Function} predicate - A predicate function to evaluate items emitted by the source Observable.
+ * @return {Observable<T>} An Observable that emits the single item emitted by the source Observable that matches
+ * the predicate or `undefined` when no items match.
+ *
+ * @method single
+ * @owner Observable
+ */
+export function single<T>(predicate?: (value: T, index: number, source: Observable<T>) => boolean): MonoTypeOperatorFunction<T> {
+  return (source: Observable<T>) => source.lift(new SingleOperator(predicate, source));
+}
+
+class SingleOperator<T> implements Operator<T, T> {
+  constructor(private predicate?: (value: T, index: number, source: Observable<T>) => boolean,
+              private source?: Observable<T>) {
+  }
+
+  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+    return source.subscribe(new SingleSubscriber(subscriber, this.predicate, this.source));
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SingleSubscriber<T> extends Subscriber<T> {
+  private seenValue: boolean = false;
+  private singleValue: T;
+  private index: number = 0;
+
+  constructor(destination: Observer<T>,
+              private predicate?: (value: T, index: number, source: Observable<T>) => boolean,
+              private source?: Observable<T>) {
+    super(destination);
+  }
+
+  private applySingleValue(value: T): void {
+    if (this.seenValue) {
+      this.destination.error('Sequence contains more than one element');
+    } else {
+      this.seenValue = true;
+      this.singleValue = value;
+    }
+  }
+
+  protected _next(value: T): void {
+    const index = this.index++;
+
+    if (this.predicate) {
+      this.tryNext(value, index);
+    } else {
+      this.applySingleValue(value);
+    }
+  }
+
+  private tryNext(value: T, index: number): void {
+    try {
+      if (this.predicate(value, index, this.source)) {
+        this.applySingleValue(value);
+      }
+    } catch (err) {
+      this.destination.error(err);
+    }
+  }
+
+  protected _complete(): void {
+    const destination = this.destination;
+
+    if (this.index > 0) {
+      destination.next(this.seenValue ? this.singleValue : undefined);
+      destination.complete();
+    } else {
+      destination.error(new EmptyError);
+    }
+  }
+}