work.suroh.tk/node_modules/rxjs/operators/mergeMapTo.js

155 lines
6.4 KiB
JavaScript

"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 OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../util/subscribeToResult');
/* tslint:enable:max-line-length */
/**
* Projects each source value to the same Observable which is merged multiple
* times in the output Observable.
*
* <span class="informal">It's like {@link mergeMap}, but maps each value always
* to the same inner Observable.</span>
*
* <img src="./img/mergeMapTo.png" width="100%">
*
* Maps each source value to the given Observable `innerObservable` regardless
* of the source value, and then merges those resulting Observables into one
* single Observable, which is the output Observable.
*
* @example <caption>For each click event, start an interval Observable ticking every 1 second</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.mergeMapTo(Rx.Observable.interval(1000));
* result.subscribe(x => console.log(x));
*
* @see {@link concatMapTo}
* @see {@link merge}
* @see {@link mergeAll}
* @see {@link mergeMap}
* @see {@link mergeScan}
* @see {@link switchMapTo}
*
* @param {ObservableInput} innerObservable An Observable to replace each value from
* the source Observable.
* @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
* A function to produce the value on the output Observable based on the values
* and the indices of the source (outer) emission and the inner Observable
* emission. The arguments passed to this function are:
* - `outerValue`: the value that came from the source
* - `innerValue`: the value that came from the projected Observable
* - `outerIndex`: the "index" of the value that came from the source
* - `innerIndex`: the "index" of the value from the projected Observable
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
* Observables being subscribed to concurrently.
* @return {Observable} An Observable that emits items from the given
* `innerObservable` (and optionally transformed through `resultSelector`) every
* time a value is emitted on the source Observable.
* @method mergeMapTo
* @owner Observable
*/
function mergeMapTo(innerObservable, resultSelector, concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
if (typeof resultSelector === 'number') {
concurrent = resultSelector;
resultSelector = null;
}
return function (source) { return source.lift(new MergeMapToOperator(innerObservable, resultSelector, concurrent)); };
}
exports.mergeMapTo = mergeMapTo;
// TODO: Figure out correct signature here: an Operator<Observable<T>, R>
// needs to implement call(observer: Subscriber<R>): Subscriber<Observable<T>>
var MergeMapToOperator = (function () {
function MergeMapToOperator(ish, resultSelector, concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
this.ish = ish;
this.resultSelector = resultSelector;
this.concurrent = concurrent;
}
MergeMapToOperator.prototype.call = function (observer, source) {
return source.subscribe(new MergeMapToSubscriber(observer, this.ish, this.resultSelector, this.concurrent));
};
return MergeMapToOperator;
}());
exports.MergeMapToOperator = MergeMapToOperator;
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var MergeMapToSubscriber = (function (_super) {
__extends(MergeMapToSubscriber, _super);
function MergeMapToSubscriber(destination, ish, resultSelector, concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
_super.call(this, destination);
this.ish = ish;
this.resultSelector = resultSelector;
this.concurrent = concurrent;
this.hasCompleted = false;
this.buffer = [];
this.active = 0;
this.index = 0;
}
MergeMapToSubscriber.prototype._next = function (value) {
if (this.active < this.concurrent) {
var resultSelector = this.resultSelector;
var index = this.index++;
var ish = this.ish;
var destination = this.destination;
this.active++;
this._innerSub(ish, destination, resultSelector, value, index);
}
else {
this.buffer.push(value);
}
};
MergeMapToSubscriber.prototype._innerSub = function (ish, destination, resultSelector, value, index) {
this.add(subscribeToResult_1.subscribeToResult(this, ish, value, index));
};
MergeMapToSubscriber.prototype._complete = function () {
this.hasCompleted = true;
if (this.active === 0 && this.buffer.length === 0) {
this.destination.complete();
}
};
MergeMapToSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
if (resultSelector) {
this.trySelectResult(outerValue, innerValue, outerIndex, innerIndex);
}
else {
destination.next(innerValue);
}
};
MergeMapToSubscriber.prototype.trySelectResult = function (outerValue, innerValue, outerIndex, innerIndex) {
var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
var result;
try {
result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
}
catch (err) {
destination.error(err);
return;
}
destination.next(result);
};
MergeMapToSubscriber.prototype.notifyError = function (err) {
this.destination.error(err);
};
MergeMapToSubscriber.prototype.notifyComplete = function (innerSub) {
var buffer = this.buffer;
this.remove(innerSub);
this.active--;
if (buffer.length > 0) {
this._next(buffer.shift());
}
else if (this.active === 0 && this.hasCompleted) {
this.destination.complete();
}
};
return MergeMapToSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
exports.MergeMapToSubscriber = MergeMapToSubscriber;
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