work.suroh.tk/node_modules/rxjs/observable/FromObservable.js

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2019-12-02 12:22:45 +00:00
"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var isArray_1 = require('../util/isArray');
var isArrayLike_1 = require('../util/isArrayLike');
var isPromise_1 = require('../util/isPromise');
var PromiseObservable_1 = require('./PromiseObservable');
var IteratorObservable_1 = require('./IteratorObservable');
var ArrayObservable_1 = require('./ArrayObservable');
var ArrayLikeObservable_1 = require('./ArrayLikeObservable');
var iterator_1 = require('../symbol/iterator');
var Observable_1 = require('../Observable');
var observeOn_1 = require('../operators/observeOn');
var observable_1 = require('../symbol/observable');
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
var FromObservable = (function (_super) {
__extends(FromObservable, _super);
function FromObservable(ish, scheduler) {
_super.call(this, null);
this.ish = ish;
this.scheduler = scheduler;
}
/**
* Creates an Observable from an Array, an array-like object, a Promise, an
* iterable object, or an Observable-like object.
*
* <span class="informal">Converts almost anything to an Observable.</span>
*
* <img src="./img/from.png" width="100%">
*
* Convert various other objects and data types into Observables. `from`
* converts a Promise or an array-like or an
* [iterable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterable)
* object into an Observable that emits the items in that promise or array or
* iterable. A String, in this context, is treated as an array of characters.
* Observable-like objects (contains a function named with the ES2015 Symbol
* for Observable) can also be converted through this operator.
*
* @example <caption>Converts an array to an Observable</caption>
* var array = [10, 20, 30];
* var result = Rx.Observable.from(array);
* result.subscribe(x => console.log(x));
*
* // Results in the following:
* // 10 20 30
*
* @example <caption>Convert an infinite iterable (from a generator) to an Observable</caption>
* function* generateDoubles(seed) {
* var i = seed;
* while (true) {
* yield i;
* i = 2 * i; // double it
* }
* }
*
* var iterator = generateDoubles(3);
* var result = Rx.Observable.from(iterator).take(10);
* result.subscribe(x => console.log(x));
*
* // Results in the following:
* // 3 6 12 24 48 96 192 384 768 1536
*
* @see {@link create}
* @see {@link fromEvent}
* @see {@link fromEventPattern}
* @see {@link fromPromise}
*
* @param {ObservableInput<T>} ish A subscribable object, a Promise, an
* Observable-like, an Array, an iterable or an array-like object to be
* converted.
* @param {Scheduler} [scheduler] The scheduler on which to schedule the
* emissions of values.
* @return {Observable<T>} The Observable whose values are originally from the
* input object that was converted.
* @static true
* @name from
* @owner Observable
*/
FromObservable.create = function (ish, scheduler) {
if (ish != null) {
if (typeof ish[observable_1.observable] === 'function') {
if (ish instanceof Observable_1.Observable && !scheduler) {
return ish;
}
return new FromObservable(ish, scheduler);
}
else if (isArray_1.isArray(ish)) {
return new ArrayObservable_1.ArrayObservable(ish, scheduler);
}
else if (isPromise_1.isPromise(ish)) {
return new PromiseObservable_1.PromiseObservable(ish, scheduler);
}
else if (typeof ish[iterator_1.iterator] === 'function' || typeof ish === 'string') {
return new IteratorObservable_1.IteratorObservable(ish, scheduler);
}
else if (isArrayLike_1.isArrayLike(ish)) {
return new ArrayLikeObservable_1.ArrayLikeObservable(ish, scheduler);
}
}
throw new TypeError((ish !== null && typeof ish || ish) + ' is not observable');
};
/** @deprecated internal use only */ FromObservable.prototype._subscribe = function (subscriber) {
var ish = this.ish;
var scheduler = this.scheduler;
if (scheduler == null) {
return ish[observable_1.observable]().subscribe(subscriber);
}
else {
return ish[observable_1.observable]().subscribe(new observeOn_1.ObserveOnSubscriber(subscriber, scheduler, 0));
}
};
return FromObservable;
}(Observable_1.Observable));
exports.FromObservable = FromObservable;
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