281 lines
9.3 KiB
JavaScript
281 lines
9.3 KiB
JavaScript
"use strict";
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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var ArrayObservable_1 = require('../observable/ArrayObservable');
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var isArray_1 = require('../util/isArray');
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var Subscriber_1 = require('../Subscriber');
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var OuterSubscriber_1 = require('../OuterSubscriber');
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var subscribeToResult_1 = require('../util/subscribeToResult');
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var iterator_1 = require('../symbol/iterator');
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/* tslint:enable:max-line-length */
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/**
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* @param observables
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* @return {Observable<R>}
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* @method zip
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* @owner Observable
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*/
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function zip() {
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var observables = [];
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for (var _i = 0; _i < arguments.length; _i++) {
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observables[_i - 0] = arguments[_i];
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}
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return function zipOperatorFunction(source) {
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return source.lift.call(zipStatic.apply(void 0, [source].concat(observables)));
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};
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}
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exports.zip = zip;
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/* tslint:enable:max-line-length */
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/**
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* Combines multiple Observables to create an Observable whose values are calculated from the values, in order, of each
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* of its input Observables.
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*
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* If the latest parameter is a function, this function is used to compute the created value from the input values.
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* Otherwise, an array of the input values is returned.
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*
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* @example <caption>Combine age and name from different sources</caption>
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*
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* let age$ = Observable.of<number>(27, 25, 29);
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* let name$ = Observable.of<string>('Foo', 'Bar', 'Beer');
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* let isDev$ = Observable.of<boolean>(true, true, false);
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*
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* Observable
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* .zip(age$,
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* name$,
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* isDev$,
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* (age: number, name: string, isDev: boolean) => ({ age, name, isDev }))
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* .subscribe(x => console.log(x));
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*
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* // outputs
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* // { age: 27, name: 'Foo', isDev: true }
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* // { age: 25, name: 'Bar', isDev: true }
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* // { age: 29, name: 'Beer', isDev: false }
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*
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* @param observables
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* @return {Observable<R>}
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* @static true
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* @name zip
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* @owner Observable
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*/
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function zipStatic() {
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var observables = [];
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for (var _i = 0; _i < arguments.length; _i++) {
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observables[_i - 0] = arguments[_i];
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}
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var project = observables[observables.length - 1];
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if (typeof project === 'function') {
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observables.pop();
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}
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return new ArrayObservable_1.ArrayObservable(observables).lift(new ZipOperator(project));
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}
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exports.zipStatic = zipStatic;
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var ZipOperator = (function () {
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function ZipOperator(project) {
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this.project = project;
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}
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ZipOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new ZipSubscriber(subscriber, this.project));
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};
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return ZipOperator;
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}());
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exports.ZipOperator = ZipOperator;
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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var ZipSubscriber = (function (_super) {
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__extends(ZipSubscriber, _super);
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function ZipSubscriber(destination, project, values) {
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if (values === void 0) { values = Object.create(null); }
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_super.call(this, destination);
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this.iterators = [];
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this.active = 0;
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this.project = (typeof project === 'function') ? project : null;
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this.values = values;
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}
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ZipSubscriber.prototype._next = function (value) {
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var iterators = this.iterators;
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if (isArray_1.isArray(value)) {
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iterators.push(new StaticArrayIterator(value));
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}
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else if (typeof value[iterator_1.iterator] === 'function') {
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iterators.push(new StaticIterator(value[iterator_1.iterator]()));
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}
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else {
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iterators.push(new ZipBufferIterator(this.destination, this, value));
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}
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};
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ZipSubscriber.prototype._complete = function () {
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var iterators = this.iterators;
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var len = iterators.length;
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if (len === 0) {
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this.destination.complete();
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return;
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}
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this.active = len;
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for (var i = 0; i < len; i++) {
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var iterator = iterators[i];
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if (iterator.stillUnsubscribed) {
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this.add(iterator.subscribe(iterator, i));
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}
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else {
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this.active--; // not an observable
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}
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}
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};
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ZipSubscriber.prototype.notifyInactive = function () {
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this.active--;
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if (this.active === 0) {
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this.destination.complete();
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}
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};
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ZipSubscriber.prototype.checkIterators = function () {
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var iterators = this.iterators;
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var len = iterators.length;
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var destination = this.destination;
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// abort if not all of them have values
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for (var i = 0; i < len; i++) {
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var iterator = iterators[i];
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if (typeof iterator.hasValue === 'function' && !iterator.hasValue()) {
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return;
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}
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}
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var shouldComplete = false;
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var args = [];
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for (var i = 0; i < len; i++) {
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var iterator = iterators[i];
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var result = iterator.next();
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// check to see if it's completed now that you've gotten
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// the next value.
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if (iterator.hasCompleted()) {
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shouldComplete = true;
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}
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if (result.done) {
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destination.complete();
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return;
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}
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args.push(result.value);
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}
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if (this.project) {
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this._tryProject(args);
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}
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else {
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destination.next(args);
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}
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if (shouldComplete) {
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destination.complete();
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}
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};
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ZipSubscriber.prototype._tryProject = function (args) {
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var result;
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try {
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result = this.project.apply(this, args);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.destination.next(result);
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};
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return ZipSubscriber;
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}(Subscriber_1.Subscriber));
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exports.ZipSubscriber = ZipSubscriber;
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var StaticIterator = (function () {
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function StaticIterator(iterator) {
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this.iterator = iterator;
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this.nextResult = iterator.next();
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}
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StaticIterator.prototype.hasValue = function () {
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return true;
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};
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StaticIterator.prototype.next = function () {
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var result = this.nextResult;
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this.nextResult = this.iterator.next();
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return result;
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};
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StaticIterator.prototype.hasCompleted = function () {
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var nextResult = this.nextResult;
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return nextResult && nextResult.done;
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};
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return StaticIterator;
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}());
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var StaticArrayIterator = (function () {
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function StaticArrayIterator(array) {
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this.array = array;
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this.index = 0;
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this.length = 0;
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this.length = array.length;
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}
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StaticArrayIterator.prototype[iterator_1.iterator] = function () {
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return this;
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};
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StaticArrayIterator.prototype.next = function (value) {
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var i = this.index++;
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var array = this.array;
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return i < this.length ? { value: array[i], done: false } : { value: null, done: true };
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};
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StaticArrayIterator.prototype.hasValue = function () {
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return this.array.length > this.index;
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};
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StaticArrayIterator.prototype.hasCompleted = function () {
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return this.array.length === this.index;
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};
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return StaticArrayIterator;
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}());
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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var ZipBufferIterator = (function (_super) {
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__extends(ZipBufferIterator, _super);
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function ZipBufferIterator(destination, parent, observable) {
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_super.call(this, destination);
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this.parent = parent;
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this.observable = observable;
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this.stillUnsubscribed = true;
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this.buffer = [];
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this.isComplete = false;
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}
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ZipBufferIterator.prototype[iterator_1.iterator] = function () {
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return this;
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};
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// NOTE: there is actually a name collision here with Subscriber.next and Iterator.next
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// this is legit because `next()` will never be called by a subscription in this case.
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ZipBufferIterator.prototype.next = function () {
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var buffer = this.buffer;
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if (buffer.length === 0 && this.isComplete) {
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return { value: null, done: true };
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}
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else {
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return { value: buffer.shift(), done: false };
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}
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};
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ZipBufferIterator.prototype.hasValue = function () {
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return this.buffer.length > 0;
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};
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ZipBufferIterator.prototype.hasCompleted = function () {
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return this.buffer.length === 0 && this.isComplete;
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};
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ZipBufferIterator.prototype.notifyComplete = function () {
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if (this.buffer.length > 0) {
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this.isComplete = true;
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this.parent.notifyInactive();
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}
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else {
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this.destination.complete();
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}
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};
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ZipBufferIterator.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.buffer.push(innerValue);
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this.parent.checkIterators();
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};
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ZipBufferIterator.prototype.subscribe = function (value, index) {
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return subscribeToResult_1.subscribeToResult(this, this.observable, this, index);
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};
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return ZipBufferIterator;
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}(OuterSubscriber_1.OuterSubscriber));
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//# sourceMappingURL=zip.js.map
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