<reponame>mclevey/FCIT607<filename>docs/node_modules/rxjs/internal/observable/combineLatest.js<gh_stars>0"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    }
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
var isScheduler_1 = require("../util/isScheduler");
var isArray_1 = require("../util/isArray");
var OuterSubscriber_1 = require("../OuterSubscriber");
var subscribeToResult_1 = require("../util/subscribeToResult");
var fromArray_1 = require("./fromArray");
var NONE = {};
function combineLatest() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i] = arguments[_i];
    }
    var resultSelector = undefined;
    var scheduler = undefined;
    if (isScheduler_1.isScheduler(observables[observables.length - 1])) {
        scheduler = observables.pop();
    }
    if (typeof observables[observables.length - 1] === 'function') {
        resultSelector = observables.pop();
    }
    if (observables.length === 1 && isArray_1.isArray(observables[0])) {
        observables = observables[0];
    }
    return fromArray_1.fromArray(observables, scheduler).lift(new CombineLatestOperator(resultSelector));
}
exports.combineLatest = combineLatest;
var CombineLatestOperator = (function () {
    function CombineLatestOperator(resultSelector) {
        this.resultSelector = resultSelector;
    }
    CombineLatestOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new CombineLatestSubscriber(subscriber, this.resultSelector));
    };
    return CombineLatestOperator;
}());
exports.CombineLatestOperator = CombineLatestOperator;
var CombineLatestSubscriber = (function (_super) {
    __extends(CombineLatestSubscriber, _super);
    function CombineLatestSubscriber(destination, resultSelector) {
        var _this = _super.call(this, destination) || this;
        _this.resultSelector = resultSelector;
        _this.active = 0;
        _this.values = [];
        _this.observables = [];
        return _this;
    }
    CombineLatestSubscriber.prototype._next = function (observable) {
        this.values.push(NONE);
        this.observables.push(observable);
    };
    CombineLatestSubscriber.prototype._complete = function () {
        var observables = this.observables;
        var len = observables.length;
        if (len === 0) {
            this.destination.complete();
        }
        else {
            this.active = len;
            this.toRespond = len;
            for (var i = 0; i < len; i++) {
                var observable = observables[i];
                this.add(subscribeToResult_1.subscribeToResult(this, observable, undefined, i));
            }
        }
    };
    CombineLatestSubscriber.prototype.notifyComplete = function (unused) {
        if ((this.active -= 1) === 0) {
            this.destination.complete();
        }
    };
    CombineLatestSubscriber.prototype.notifyNext = function (_outerValue, innerValue, outerIndex) {
        var values = this.values;
        var oldVal = values[outerIndex];
        var toRespond = !this.toRespond
            ? 0
            : oldVal === NONE ? --this.toRespond : this.toRespond;
        values[outerIndex] = innerValue;
        if (toRespond === 0) {
            if (this.resultSelector) {
                this._tryResultSelector(values);
            }
            else {
                this.destination.next(values.slice());
            }
        }
    };
    CombineLatestSubscriber.prototype._tryResultSelector = function (values) {
        var result;
        try {
            result = this.resultSelector.apply(this, values);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return CombineLatestSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
exports.CombineLatestSubscriber = CombineLatestSubscriber;
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