@reactivex/rxjs/dist/amd/operator/takeWhile.js

Reactive Extensions for modern JavaScript

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 __());
};
define(["require", "exports", '../Subscriber'], function (require, exports, Subscriber_1) {
    "use strict";
    /**
     * @param predicate
     * @return {Observable<R>|WebSocketSubject<T>|Observable<T>}
     * @method takeWhile
     * @owner Observable
     */
    function takeWhile(predicate) {
        return this.lift(new TakeWhileOperator(predicate));
    }
    exports.takeWhile = takeWhile;
    var TakeWhileOperator = (function () {
        function TakeWhileOperator(predicate) {
            this.predicate = predicate;
        }
        TakeWhileOperator.prototype.call = function (subscriber, source) {
            return source._subscribe(new TakeWhileSubscriber(subscriber, this.predicate));
        };
        return TakeWhileOperator;
    }());
    /**
     * We need this JSDoc comment for affecting ESDoc.
     * @ignore
     * @extends {Ignored}
     */
    var TakeWhileSubscriber = (function (_super) {
        __extends(TakeWhileSubscriber, _super);
        function TakeWhileSubscriber(destination, predicate) {
            _super.call(this, destination);
            this.predicate = predicate;
            this.index = 0;
        }
        TakeWhileSubscriber.prototype._next = function (value) {
            var destination = this.destination;
            var result;
            try {
                result = this.predicate(value, this.index++);
            }
            catch (err) {
                destination.error(err);
                return;
            }
            this.nextOrComplete(value, result);
        };
        TakeWhileSubscriber.prototype.nextOrComplete = function (value, predicateResult) {
            var destination = this.destination;
            if (Boolean(predicateResult)) {
                destination.next(value);
            }
            else {
                destination.complete();
            }
        };
        return TakeWhileSubscriber;
    }(Subscriber_1.Subscriber));
});
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