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import { Observable } from '../Observable';
import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { TeardownLogic } from '../Subscription';
import { MonoTypeOperatorFunction } from '../interfaces';
/**
* Returns an Observable that skips all items emitted by the source Observable as long as a specified condition holds
* true, but emits all further source items as soon as the condition becomes false.
*
* <img src="./img/skipWhile.png" width="100%">
*
* @param {Function} predicate - A function to test each item emitted from the source Observable.
* @return {Observable<T>} An Observable that begins emitting items emitted by the source Observable when the
* specified predicate becomes false.
* @method skipWhile
* @owner Observable
*/
export function skipWhile<T>(predicate: (value: T, index: number) => boolean): MonoTypeOperatorFunction<T> {
return (source: Observable<T>) => source.lift(new SkipWhileOperator(predicate));
}
class SkipWhileOperator<T> implements Operator<T, T> {
constructor(private predicate: (value: T, index: number) => boolean) {
}
call(subscriber: Subscriber<T>, source: any): TeardownLogic {
return source.subscribe(new SkipWhileSubscriber(subscriber, this.predicate));
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
class SkipWhileSubscriber<T> extends Subscriber<T> {
private skipping: boolean = true;
private index: number = 0;
constructor(destination: Subscriber<T>,
private predicate: (value: T, index: number) => boolean) {
super(destination);
}
protected _next(value: T): void {
const destination = this.destination;
if (this.skipping) {
this.tryCallPredicate(value);
}
if (!this.skipping) {
destination.next(value);
}
}
private tryCallPredicate(value: T): void {
try {
const result = this.predicate(value, this.index++);
this.skipping = Boolean(result);
} catch (err) {
this.destination.error(err);
}
}
}