@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
197 lines • 7.63 kB
JavaScript
"use strict";
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
}
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var Subject_1 = require("../Subject");
var Subscription_1 = require("../Subscription");
var OuterSubscriber_1 = require("../OuterSubscriber");
var subscribeToResult_1 = require("../util/subscribeToResult");
/**
* Branch out the source Observable values as a nested Observable starting from
* an emission from `openings` and ending when the output of `closingSelector`
* emits.
*
* <span class="informal">It's like {@link bufferToggle}, but emits a nested
* Observable instead of an array.</span>
*
* 
*
* Returns an Observable that emits windows of items it collects from the source
* Observable. The output Observable emits windows that contain those items
* emitted by the source Observable between the time when the `openings`
* Observable emits an item and when the Observable returned by
* `closingSelector` emits an item.
*
* ## Example
* Every other second, emit the click events from the next 500ms
* ```ts
* import { fromEvent, interval, EMPTY } from 'rxjs';
* import { windowToggle, mergeAll } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const openings = interval(1000);
* const result = clicks.pipe(
* windowToggle(openings, i => i % 2 ? interval(500) : EMPTY),
* mergeAll()
* );
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link window}
* @see {@link windowCount}
* @see {@link windowTime}
* @see {@link windowWhen}
* @see {@link bufferToggle}
*
* @param {Observable<O>} openings An observable of notifications to start new
* windows.
* @param {function(value: O): Observable} closingSelector A function that takes
* the value emitted by the `openings` observable and returns an Observable,
* which, when it emits (either `next` or `complete`), signals that the
* associated window should complete.
* @return {Observable<Observable<T>>} An observable of windows, which in turn
* are Observables.
* @method windowToggle
* @owner Observable
*/
function windowToggle(openings, closingSelector) {
return function (source) { return source.lift(new WindowToggleOperator(openings, closingSelector)); };
}
exports.windowToggle = windowToggle;
var WindowToggleOperator = /** @class */ (function () {
function WindowToggleOperator(openings, closingSelector) {
this.openings = openings;
this.closingSelector = closingSelector;
}
WindowToggleOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new WindowToggleSubscriber(subscriber, this.openings, this.closingSelector));
};
return WindowToggleOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var WindowToggleSubscriber = /** @class */ (function (_super) {
__extends(WindowToggleSubscriber, _super);
function WindowToggleSubscriber(destination, openings, closingSelector) {
var _this = _super.call(this, destination) || this;
_this.openings = openings;
_this.closingSelector = closingSelector;
_this.contexts = [];
_this.add(_this.openSubscription = subscribeToResult_1.subscribeToResult(_this, openings, openings));
return _this;
}
WindowToggleSubscriber.prototype._next = function (value) {
var contexts = this.contexts;
if (contexts) {
var len = contexts.length;
for (var i = 0; i < len; i++) {
contexts[i].window.next(value);
}
}
};
WindowToggleSubscriber.prototype._error = function (err) {
var contexts = this.contexts;
this.contexts = null;
if (contexts) {
var len = contexts.length;
var index = -1;
while (++index < len) {
var context_1 = contexts[index];
context_1.window.error(err);
context_1.subscription.unsubscribe();
}
}
_super.prototype._error.call(this, err);
};
WindowToggleSubscriber.prototype._complete = function () {
var contexts = this.contexts;
this.contexts = null;
if (contexts) {
var len = contexts.length;
var index = -1;
while (++index < len) {
var context_2 = contexts[index];
context_2.window.complete();
context_2.subscription.unsubscribe();
}
}
_super.prototype._complete.call(this);
};
/** @deprecated This is an internal implementation detail, do not use. */
WindowToggleSubscriber.prototype._unsubscribe = function () {
var contexts = this.contexts;
this.contexts = null;
if (contexts) {
var len = contexts.length;
var index = -1;
while (++index < len) {
var context_3 = contexts[index];
context_3.window.unsubscribe();
context_3.subscription.unsubscribe();
}
}
};
WindowToggleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
if (outerValue === this.openings) {
var closingNotifier = void 0;
try {
var closingSelector = this.closingSelector;
closingNotifier = closingSelector(innerValue);
}
catch (e) {
return this.error(e);
}
var window_1 = new Subject_1.Subject();
var subscription = new Subscription_1.Subscription();
var context_4 = { window: window_1, subscription: subscription };
this.contexts.push(context_4);
var innerSubscription = subscribeToResult_1.subscribeToResult(this, closingNotifier, context_4);
if (innerSubscription.closed) {
this.closeWindow(this.contexts.length - 1);
}
else {
innerSubscription.context = context_4;
subscription.add(innerSubscription);
}
this.destination.next(window_1);
}
else {
this.closeWindow(this.contexts.indexOf(outerValue));
}
};
WindowToggleSubscriber.prototype.notifyError = function (err) {
this.error(err);
};
WindowToggleSubscriber.prototype.notifyComplete = function (inner) {
if (inner !== this.openSubscription) {
this.closeWindow(this.contexts.indexOf(inner.context));
}
};
WindowToggleSubscriber.prototype.closeWindow = function (index) {
if (index === -1) {
return;
}
var contexts = this.contexts;
var context = contexts[index];
var window = context.window, subscription = context.subscription;
contexts.splice(index, 1);
window.complete();
subscription.unsubscribe();
};
return WindowToggleSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
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