131 lines
4.8 KiB
JavaScript
131 lines
4.8 KiB
JavaScript
/** PURE_IMPORTS_START .._util_tryCatch,.._util_errorObject,.._util_subscribeToResult,.._OuterSubscriber PURE_IMPORTS_END */
|
|
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 __());
|
|
};
|
|
import { tryCatch } from '../util/tryCatch';
|
|
import { errorObject } from '../util/errorObject';
|
|
import { subscribeToResult } from '../util/subscribeToResult';
|
|
import { OuterSubscriber } from '../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
|
|
*/
|
|
export function mergeScan(accumulator, seed, concurrent) {
|
|
if (concurrent === void 0) {
|
|
concurrent = Number.POSITIVE_INFINITY;
|
|
}
|
|
return function (source) { return source.lift(new MergeScanOperator(accumulator, seed, concurrent)); };
|
|
}
|
|
export var MergeScanOperator = /*@__PURE__*/ (/*@__PURE__*/ 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;
|
|
}());
|
|
/**
|
|
* We need this JSDoc comment for affecting ESDoc.
|
|
* @ignore
|
|
* @extends {Ignored}
|
|
*/
|
|
export var MergeScanSubscriber = /*@__PURE__*/ (/*@__PURE__*/ 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(this.accumulator)(this.acc, value);
|
|
var destination = this.destination;
|
|
if (ish === errorObject) {
|
|
destination.error(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(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));
|
|
//# sourceMappingURL=mergeScan.js.map
|