es6/operator/zip.js

import { ArrayObservable } from '../observable/ArrayObservable';
import { isArray } from '../util/isArray';
import { Subscriber } from '../Subscriber';
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
import { $$iterator } from '../symbol/iterator';
/* tslint:disable:max-line-length */
export function zipProto() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    return this.lift.call(zipStatic.apply(void 0, [this].concat(observables)));
}
/* tslint:enable:max-line-length */
/**
 * @param observables
 * @return {Observable<R>}
 * @static true
 * @name zip
 * @owner Observable
 */
export function zipStatic() {
    var observables = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        observables[_i - 0] = arguments[_i];
    }
    var project = observables[observables.length - 1];
    if (typeof project === 'function') {
        observables.pop();
    }
    return new ArrayObservable(observables).lift(new ZipOperator(project));
}
export var ZipOperator = (function () {
    function ZipOperator(project) {
        this.project = project;
    }
    ZipOperator.prototype.call = function (subscriber, source) {
        return source._subscribe(new ZipSubscriber(subscriber, this.project));
    };
    return ZipOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
export var ZipSubscriber = (function (_super) {
    __extends(ZipSubscriber, _super);
    function ZipSubscriber(destination, project, values) {
        if (values === void 0) { values = Object.create(null); }
        _super.call(this, destination);
        this.iterators = [];
        this.active = 0;
        this.project = (typeof project === 'function') ? project : null;
        this.values = values;
    }
    ZipSubscriber.prototype._next = function (value) {
        var iterators = this.iterators;
        if (isArray(value)) {
            iterators.push(new StaticArrayIterator(value));
        }
        else if (typeof value[$$iterator] === 'function') {
            iterators.push(new StaticIterator(value[$$iterator]()));
        }
        else {
            iterators.push(new ZipBufferIterator(this.destination, this, value));
        }
    };
    ZipSubscriber.prototype._complete = function () {
        var iterators = this.iterators;
        var len = iterators.length;
        this.active = len;
        for (var i = 0; i < len; i++) {
            var iterator = iterators[i];
            if (iterator.stillUnsubscribed) {
                this.add(iterator.subscribe(iterator, i));
            }
            else {
                this.active--; // not an observable
            }
        }
    };
    ZipSubscriber.prototype.notifyInactive = function () {
        this.active--;
        if (this.active === 0) {
            this.destination.complete();
        }
    };
    ZipSubscriber.prototype.checkIterators = function () {
        var iterators = this.iterators;
        var len = iterators.length;
        var destination = this.destination;
        // abort if not all of them have values
        for (var i = 0; i < len; i++) {
            var iterator = iterators[i];
            if (typeof iterator.hasValue === 'function' && !iterator.hasValue()) {
                return;
            }
        }
        var shouldComplete = false;
        var args = [];
        for (var i = 0; i < len; i++) {
            var iterator = iterators[i];
            var result = iterator.next();
            // check to see if it's completed now that you've gotten
            // the next value.
            if (iterator.hasCompleted()) {
                shouldComplete = true;
            }
            if (result.done) {
                destination.complete();
                return;
            }
            args.push(result.value);
        }
        if (this.project) {
            this._tryProject(args);
        }
        else {
            destination.next(args);
        }
        if (shouldComplete) {
            destination.complete();
        }
    };
    ZipSubscriber.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 ZipSubscriber;
}(Subscriber));
var StaticIterator = (function () {
    function StaticIterator(iterator) {
        this.iterator = iterator;
        this.nextResult = iterator.next();
    }
    StaticIterator.prototype.hasValue = function () {
        return true;
    };
    StaticIterator.prototype.next = function () {
        var result = this.nextResult;
        this.nextResult = this.iterator.next();
        return result;
    };
    StaticIterator.prototype.hasCompleted = function () {
        var nextResult = this.nextResult;
        return nextResult && nextResult.done;
    };
    return StaticIterator;
}());
var StaticArrayIterator = (function () {
    function StaticArrayIterator(array) {
        this.array = array;
        this.index = 0;
        this.length = 0;
        this.length = array.length;
    }
    StaticArrayIterator.prototype[$$iterator] = function () {
        return this;
    };
    StaticArrayIterator.prototype.next = function (value) {
        var i = this.index++;
        var array = this.array;
        return i < this.length ? { value: array[i], done: false } : { value: null, done: true };
    };
    StaticArrayIterator.prototype.hasValue = function () {
        return this.array.length > this.index;
    };
    StaticArrayIterator.prototype.hasCompleted = function () {
        return this.array.length === this.index;
    };
    return StaticArrayIterator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ZipBufferIterator = (function (_super) {
    __extends(ZipBufferIterator, _super);
    function ZipBufferIterator(destination, parent, observable) {
        _super.call(this, destination);
        this.parent = parent;
        this.observable = observable;
        this.stillUnsubscribed = true;
        this.buffer = [];
        this.isComplete = false;
    }
    ZipBufferIterator.prototype[$$iterator] = function () {
        return this;
    };
    // NOTE: there is actually a name collision here with Subscriber.next and Iterator.next
    //    this is legit because `next()` will never be called by a subscription in this case.
    ZipBufferIterator.prototype.next = function () {
        var buffer = this.buffer;
        if (buffer.length === 0 && this.isComplete) {
            return { value: null, done: true };
        }
        else {
            return { value: buffer.shift(), done: false };
        }
    };
    ZipBufferIterator.prototype.hasValue = function () {
        return this.buffer.length > 0;
    };
    ZipBufferIterator.prototype.hasCompleted = function () {
        return this.buffer.length === 0 && this.isComplete;
    };
    ZipBufferIterator.prototype.notifyComplete = function () {
        if (this.buffer.length > 0) {
            this.isComplete = true;
            this.parent.notifyInactive();
        }
        else {
            this.destination.complete();
        }
    };
    ZipBufferIterator.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.buffer.push(innerValue);
        this.parent.checkIterators();
    };
    ZipBufferIterator.prototype.subscribe = function (value, index) {
        return subscribeToResult(this, this.observable, this, index);
    };
    return ZipBufferIterator;
}(OuterSubscriber));
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