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

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+import { Operator } from '../Operator';
+import { Observable } from '../Observable';
+import { Subscriber } from '../Subscriber';
+import { OperatorFunction, MonoTypeOperatorFunction, TeardownLogic } from '../types';
+
+export function takeWhile<T, S extends T>(predicate: (value: T, index: number) => value is S): OperatorFunction<T, S>;
+export function takeWhile<T, S extends T>(predicate: (value: T, index: number) => value is S, inclusive: false): OperatorFunction<T, S>;
+export function takeWhile<T>(predicate: (value: T, index: number) => boolean, inclusive?: boolean): MonoTypeOperatorFunction<T>;
+
+/**
+ * Emits values emitted by the source Observable so long as each value satisfies
+ * the given `predicate`, and then completes as soon as this `predicate` is not
+ * satisfied.
+ *
+ * <span class="informal">Takes values from the source only while they pass the
+ * condition given. When the first value does not satisfy, it completes.</span>
+ *
+ * ![](takeWhile.png)
+ *
+ * `takeWhile` subscribes and begins mirroring the source Observable. Each value
+ * emitted on the source is given to the `predicate` function which returns a
+ * boolean, representing a condition to be satisfied by the source values. The
+ * output Observable emits the source values until such time as the `predicate`
+ * returns false, at which point `takeWhile` stops mirroring the source
+ * Observable and completes the output Observable.
+ *
+ * ## Example
+ * Emit click events only while the clientX property is greater than 200
+ * ```ts
+ * import { fromEvent } from 'rxjs';
+ * import { takeWhile } from 'rxjs/operators';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const result = clicks.pipe(takeWhile(ev => ev.clientX > 200));
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link take}
+ * @see {@link takeLast}
+ * @see {@link takeUntil}
+ * @see {@link skip}
+ *
+ * @param {function(value: T, index: number): boolean} predicate A function that
+ * evaluates a value emitted by the source Observable and returns a boolean.
+ * Also takes the (zero-based) index as the second argument.
+ * @param {boolean} inclusive When set to `true` the value that caused
+ * `predicate` to return `false` will also be emitted.
+ * @return {Observable<T>} An Observable that emits the values from the source
+ * Observable so long as each value satisfies the condition defined by the
+ * `predicate`, then completes.
+ * @method takeWhile
+ * @owner Observable
+ */
+export function takeWhile<T>(
+    predicate: (value: T, index: number) => boolean,
+    inclusive = false): MonoTypeOperatorFunction<T> {
+  return (source: Observable<T>) =>
+             source.lift(new TakeWhileOperator(predicate, inclusive));
+}
+
+class TakeWhileOperator<T> implements Operator<T, T> {
+  constructor(
+      private predicate: (value: T, index: number) => boolean,
+      private inclusive: boolean) {}
+
+  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+    return source.subscribe(
+        new TakeWhileSubscriber(subscriber, this.predicate, this.inclusive));
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class TakeWhileSubscriber<T> extends Subscriber<T> {
+  private index: number = 0;
+
+  constructor(
+      destination: Subscriber<T>,
+      private predicate: (value: T, index: number) => boolean,
+      private inclusive: boolean) {
+    super(destination);
+  }
+
+  protected _next(value: T): void {
+    const destination = this.destination;
+    let result: boolean;
+    try {
+      result = this.predicate(value, this.index++);
+    } catch (err) {
+      destination.error(err);
+      return;
+    }
+    this.nextOrComplete(value, result);
+  }
+
+  private nextOrComplete(value: T, predicateResult: boolean): void {
+    const destination = this.destination;
+    if (Boolean(predicateResult)) {
+      destination.next(value);
+    } else {
+      if (this.inclusive) {
+        destination.next(value);
+      }
+      destination.complete();
+    }
+  }
+}