skipWhile.js

/** PURE_IMPORTS_START .._Subscriber PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b)
        if (b.hasOwnProperty(p))
            d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { Subscriber } from '../Subscriber';
/**
 * 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(predicate) {
    return function (source) { return source.lift(new SkipWhileOperator(predicate)); };
}
var SkipWhileOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
    function SkipWhileOperator(predicate) {
        this.predicate = predicate;
    }
    SkipWhileOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SkipWhileSubscriber(subscriber, this.predicate));
    };
    return SkipWhileOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SkipWhileSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
    __extends(SkipWhileSubscriber, _super);
    function SkipWhileSubscriber(destination, predicate) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.skipping = true;
        this.index = 0;
    }
    SkipWhileSubscriber.prototype._next = function (value) {
        var destination = this.destination;
        if (this.skipping) {
            this.tryCallPredicate(value);
        }
        if (!this.skipping) {
            destination.next(value);
        }
    };
    SkipWhileSubscriber.prototype.tryCallPredicate = function (value) {
        try {
            var result = this.predicate(value, this.index++);
            this.skipping = Boolean(result);
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    return SkipWhileSubscriber;
}(Subscriber));
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