122 lines
5.0 KiB
JavaScript
122 lines
5.0 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 isArray_1 = require('../util/isArray');
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var isArrayLike_1 = require('../util/isArrayLike');
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var isPromise_1 = require('../util/isPromise');
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var PromiseObservable_1 = require('./PromiseObservable');
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var IteratorObservable_1 = require('./IteratorObservable');
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var ArrayObservable_1 = require('./ArrayObservable');
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var ArrayLikeObservable_1 = require('./ArrayLikeObservable');
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var iterator_1 = require('../symbol/iterator');
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var Observable_1 = require('../Observable');
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var observeOn_1 = require('../operators/observeOn');
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var observable_1 = require('../symbol/observable');
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @extends {Ignored}
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* @hide true
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*/
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var FromObservable = (function (_super) {
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__extends(FromObservable, _super);
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function FromObservable(ish, scheduler) {
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_super.call(this, null);
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this.ish = ish;
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this.scheduler = scheduler;
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}
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/**
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* Creates an Observable from an Array, an array-like object, a Promise, an
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* iterable object, or an Observable-like object.
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*
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* <span class="informal">Converts almost anything to an Observable.</span>
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*
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* <img src="./img/from.png" width="100%">
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*
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* Convert various other objects and data types into Observables. `from`
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* converts a Promise or an array-like or an
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* [iterable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterable)
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* object into an Observable that emits the items in that promise or array or
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* iterable. A String, in this context, is treated as an array of characters.
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* Observable-like objects (contains a function named with the ES2015 Symbol
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* for Observable) can also be converted through this operator.
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*
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* @example <caption>Converts an array to an Observable</caption>
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* var array = [10, 20, 30];
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* var result = Rx.Observable.from(array);
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* result.subscribe(x => console.log(x));
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*
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* // Results in the following:
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* // 10 20 30
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*
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* @example <caption>Convert an infinite iterable (from a generator) to an Observable</caption>
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* function* generateDoubles(seed) {
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* var i = seed;
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* while (true) {
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* yield i;
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* i = 2 * i; // double it
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* }
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* }
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*
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* var iterator = generateDoubles(3);
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* var result = Rx.Observable.from(iterator).take(10);
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* result.subscribe(x => console.log(x));
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*
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* // Results in the following:
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* // 3 6 12 24 48 96 192 384 768 1536
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*
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* @see {@link create}
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* @see {@link fromEvent}
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* @see {@link fromEventPattern}
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* @see {@link fromPromise}
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*
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* @param {ObservableInput<T>} ish A subscribable object, a Promise, an
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* Observable-like, an Array, an iterable or an array-like object to be
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* converted.
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* @param {Scheduler} [scheduler] The scheduler on which to schedule the
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* emissions of values.
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* @return {Observable<T>} The Observable whose values are originally from the
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* input object that was converted.
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* @static true
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* @name from
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* @owner Observable
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*/
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FromObservable.create = function (ish, scheduler) {
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if (ish != null) {
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if (typeof ish[observable_1.observable] === 'function') {
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if (ish instanceof Observable_1.Observable && !scheduler) {
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return ish;
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}
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return new FromObservable(ish, scheduler);
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}
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else if (isArray_1.isArray(ish)) {
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return new ArrayObservable_1.ArrayObservable(ish, scheduler);
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}
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else if (isPromise_1.isPromise(ish)) {
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return new PromiseObservable_1.PromiseObservable(ish, scheduler);
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}
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else if (typeof ish[iterator_1.iterator] === 'function' || typeof ish === 'string') {
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return new IteratorObservable_1.IteratorObservable(ish, scheduler);
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}
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else if (isArrayLike_1.isArrayLike(ish)) {
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return new ArrayLikeObservable_1.ArrayLikeObservable(ish, scheduler);
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}
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}
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throw new TypeError((ish !== null && typeof ish || ish) + ' is not observable');
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};
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/** @deprecated internal use only */ FromObservable.prototype._subscribe = function (subscriber) {
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var ish = this.ish;
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var scheduler = this.scheduler;
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if (scheduler == null) {
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return ish[observable_1.observable]().subscribe(subscriber);
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}
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else {
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return ish[observable_1.observable]().subscribe(new observeOn_1.ObserveOnSubscriber(subscriber, scheduler, 0));
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}
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};
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return FromObservable;
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}(Observable_1.Observable));
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exports.FromObservable = FromObservable;
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//# sourceMappingURL=FromObservable.js.map
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