es6/operator/withLatestFrom.js

import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/* tslint:disable:max-line-length */
export function withLatestFrom() {
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i - 0] = arguments[_i];
    }
    var project;
    if (typeof args[args.length - 1] === 'function') {
        project = args.pop();
    }
    var observables = args;
    return this.lift(new WithLatestFromOperator(observables, project));
}
var WithLatestFromOperator = (function () {
    function WithLatestFromOperator(observables, project) {
        this.observables = observables;
        this.project = project;
    }
    WithLatestFromOperator.prototype.call = function (subscriber, source) {
        return source._subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));
    };
    return WithLatestFromOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var WithLatestFromSubscriber = (function (_super) {
    __extends(WithLatestFromSubscriber, _super);
    function WithLatestFromSubscriber(destination, observables, project) {
        _super.call(this, destination);
        this.observables = observables;
        this.project = project;
        this.toRespond = [];
        var len = observables.length;
        this.values = new Array(len);
        for (var i = 0; i < len; i++) {
            this.toRespond.push(i);
        }
        for (var i = 0; i < len; i++) {
            var observable = observables[i];
            this.add(subscribeToResult(this, observable, observable, i));
        }
    }
    WithLatestFromSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.values[outerIndex] = innerValue;
        var toRespond = this.toRespond;
        if (toRespond.length > 0) {
            var found = toRespond.indexOf(outerIndex);
            if (found !== -1) {
                toRespond.splice(found, 1);
            }
        }
    };
    WithLatestFromSubscriber.prototype.notifyComplete = function () {
        // noop
    };
    WithLatestFromSubscriber.prototype._next = function (value) {
        if (this.toRespond.length === 0) {
            var args = [value].concat(this.values);
            if (this.project) {
                this._tryProject(args);
            }
            else {
                this.destination.next(args);
            }
        }
    };
    WithLatestFromSubscriber.prototype._tryProject = function (args) {
        var result;
        try {
            result = this.project.apply(this, args);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return WithLatestFromSubscriber;
}(OuterSubscriber));
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