124 lines
5.3 KiB
JavaScript
124 lines
5.3 KiB
JavaScript
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"use strict";
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var root_1 = require('./util/root');
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var SymbolShim_1 = require('./util/SymbolShim');
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var toSubscriber_1 = require('./util/toSubscriber');
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var tryCatch_1 = require('./util/tryCatch');
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var errorObject_1 = require('./util/errorObject');
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/**
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* A representation of any set of values over any amount of time. This the most basic building block
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* of RxJS.
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*
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* @class Observable<T>
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*/
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var Observable = (function () {
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/**
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* @constructor
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* @param {Function} subscribe the function that is
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* called when the Observable is initially subscribed to. This function is given a Subscriber, to which new values
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* can be `next`ed, or an `error` method can be called to raise an error, or `complete` can be called to notify
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* of a successful completion.
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*/
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function Observable(subscribe) {
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this._isScalar = false;
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if (subscribe) {
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this._subscribe = subscribe;
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}
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}
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/**
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* @method lift
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* @param {Operator} operator the operator defining the operation to take on the observable
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* @returns {Observable} a new observable with the Operator applied
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* @description creates a new Observable, with this Observable as the source, and the passed
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* operator defined as the new observable's operator.
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*/
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Observable.prototype.lift = function (operator) {
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var observable = new Observable();
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observable.source = this;
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observable.operator = operator;
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return observable;
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};
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/**
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* @method subscribe
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* @param {PartialObserver|Function} observerOrNext (optional) either an observer defining all functions to be called,
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* or the first of three possible handlers, which is the handler for each value emitted from the observable.
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* @param {Function} error (optional) a handler for a terminal event resulting from an error. If no error handler is provided,
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* the error will be thrown as unhandled
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* @param {Function} complete (optional) a handler for a terminal event resulting from successful completion.
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* @returns {Subscription} a subscription reference to the registered handlers
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* @description registers handlers for handling emitted values, error and completions from the observable, and
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* executes the observable's subscriber function, which will take action to set up the underlying data stream
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*/
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Observable.prototype.subscribe = function (observerOrNext, error, complete) {
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var operator = this.operator;
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var subscriber = toSubscriber_1.toSubscriber(observerOrNext, error, complete);
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if (operator) {
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subscriber.add(this._subscribe(operator.call(subscriber)));
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}
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else {
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subscriber.add(this._subscribe(subscriber));
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}
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if (subscriber.syncErrorThrowable) {
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subscriber.syncErrorThrowable = false;
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if (subscriber.syncErrorThrown) {
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throw subscriber.syncErrorValue;
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}
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}
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return subscriber;
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};
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/**
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* @method forEach
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* @param {Function} next a handler for each value emitted by the observable
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* @param {any} [thisArg] a `this` context for the `next` handler function
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* @param {PromiseConstructor} [PromiseCtor] a constructor function used to instantiate the Promise
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* @returns {Promise} a promise that either resolves on observable completion or
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* rejects with the handled error
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*/
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Observable.prototype.forEach = function (next, thisArg, PromiseCtor) {
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if (!PromiseCtor) {
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if (root_1.root.Rx && root_1.root.Rx.config && root_1.root.Rx.config.Promise) {
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PromiseCtor = root_1.root.Rx.config.Promise;
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}
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else if (root_1.root.Promise) {
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PromiseCtor = root_1.root.Promise;
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}
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}
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if (!PromiseCtor) {
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throw new Error('no Promise impl found');
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}
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var source = this;
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return new PromiseCtor(function (resolve, reject) {
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source.subscribe(function (value) {
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var result = tryCatch_1.tryCatch(next).call(thisArg, value);
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if (result === errorObject_1.errorObject) {
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reject(errorObject_1.errorObject.e);
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}
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}, reject, resolve);
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});
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};
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Observable.prototype._subscribe = function (subscriber) {
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return this.source.subscribe(subscriber);
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};
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/**
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* @method Symbol.observable
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* @returns {Observable} this instance of the observable
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* @description an interop point defined by the es7-observable spec https://github.com/zenparsing/es-observable
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*/
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Observable.prototype[SymbolShim_1.SymbolShim.observable] = function () {
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return this;
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};
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// HACK: Since TypeScript inherits static properties too, we have to
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// fight against TypeScript here so Subject can have a different static create signature
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/**
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* @static
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* @method create
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* @param {Function} subscribe? the subscriber function to be passed to the Observable constructor
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* @returns {Observable} a new cold observable
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* @description creates a new cold Observable by calling the Observable constructor
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*/
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Observable.create = function (subscribe) {
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return new Observable(subscribe);
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};
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return Observable;
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}());
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exports.Observable = Observable;
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//# sourceMappingURL=Observable.js.map
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