work.suroh.tk/node_modules/rxjs/operators/mergeScan.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 tryCatch_1 = require('../util/tryCatch');
var errorObject_1 = require('../util/errorObject');
var subscribeToResult_1 = require('../util/subscribeToResult');
var OuterSubscriber_1 = require('../OuterSubscriber');
/**
* Applies an accumulator function over the source Observable where the
* accumulator function itself returns an Observable, then each intermediate
* Observable returned is merged into the output Observable.
*
* <span class="informal">It's like {@link scan}, but the Observables returned
* by the accumulator are merged into the outer Observable.</span>
*
* @example <caption>Count the number of click events</caption>
* const click$ = Rx.Observable.fromEvent(document, 'click');
* const one$ = click$.mapTo(1);
* const seed = 0;
* const count$ = one$.mergeScan((acc, one) => Rx.Observable.of(acc + one), seed);
* count$.subscribe(x => console.log(x));
*
* // Results:
* 1
* 2
* 3
* 4
* // ...and so on for each click
*
* @param {function(acc: R, value: T): Observable<R>} accumulator
* The accumulator function called on each source value.
* @param seed The initial accumulation value.
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of
* input Observables being subscribed to concurrently.
* @return {Observable<R>} An observable of the accumulated values.
* @method mergeScan
* @owner Observable
*/
function mergeScan(accumulator, seed, concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
return function (source) { return source.lift(new MergeScanOperator(accumulator, seed, concurrent)); };
}
exports.mergeScan = mergeScan;
var MergeScanOperator = (function () {
function MergeScanOperator(accumulator, seed, concurrent) {
this.accumulator = accumulator;
this.seed = seed;
this.concurrent = concurrent;
}
MergeScanOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent));
};
return MergeScanOperator;
}());
exports.MergeScanOperator = MergeScanOperator;
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var MergeScanSubscriber = (function (_super) {
__extends(MergeScanSubscriber, _super);
function MergeScanSubscriber(destination, accumulator, acc, concurrent) {
_super.call(this, destination);
this.accumulator = accumulator;
this.acc = acc;
this.concurrent = concurrent;
this.hasValue = false;
this.hasCompleted = false;
this.buffer = [];
this.active = 0;
this.index = 0;
}
MergeScanSubscriber.prototype._next = function (value) {
if (this.active < this.concurrent) {
var index = this.index++;
var ish = tryCatch_1.tryCatch(this.accumulator)(this.acc, value);
var destination = this.destination;
if (ish === errorObject_1.errorObject) {
destination.error(errorObject_1.errorObject.e);
}
else {
this.active++;
this._innerSub(ish, value, index);
}
}
else {
this.buffer.push(value);
}
};
MergeScanSubscriber.prototype._innerSub = function (ish, value, index) {
this.add(subscribeToResult_1.subscribeToResult(this, ish, value, index));
};
MergeScanSubscriber.prototype._complete = function () {
this.hasCompleted = true;
if (this.active === 0 && this.buffer.length === 0) {
if (this.hasValue === false) {
this.destination.next(this.acc);
}
this.destination.complete();
}
};
MergeScanSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
var destination = this.destination;
this.acc = innerValue;
this.hasValue = true;
destination.next(innerValue);
};
MergeScanSubscriber.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) {
if (this.hasValue === false) {
this.destination.next(this.acc);
}
this.destination.complete();
}
};
return MergeScanSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
exports.MergeScanSubscriber = MergeScanSubscriber;
//# sourceMappingURL=mergeScan.js.map