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/** PURE_IMPORTS_START tslib,_util_subscribeToResult,_OuterSubscriber,_InnerSubscriber PURE_IMPORTS_END */
import * as tslib_1 from "tslib";
import { subscribeToResult } from '../util/subscribeToResult';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
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)); };
}
var MergeScanOperator = /*@__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;
}());
export { MergeScanOperator };
var MergeScanSubscriber = /*@__PURE__*/ (function (_super) {
tslib_1.__extends(MergeScanSubscriber, _super);
function MergeScanSubscriber(destination, accumulator, acc, concurrent) {
var _this = _super.call(this, destination) || this;
_this.accumulator = accumulator;
_this.acc = acc;
_this.concurrent = concurrent;
_this.hasValue = false;
_this.hasCompleted = false;
_this.buffer = [];
_this.active = 0;
_this.index = 0;
return _this;
}
MergeScanSubscriber.prototype._next = function (value) {
if (this.active < this.concurrent) {
var index = this.index++;
var destination = this.destination;
var ish = void 0;
try {
var accumulator = this.accumulator;
ish = accumulator(this.acc, value, index);
}
catch (e) {
return destination.error(e);
}
this.active++;
this._innerSub(ish, value, index);
}
else {
this.buffer.push(value);
}
};
MergeScanSubscriber.prototype._innerSub = function (ish, value, index) {
var innerSubscriber = new InnerSubscriber(this, undefined, undefined);
var destination = this.destination;
destination.add(innerSubscriber);
subscribeToResult(this, ish, value, index, innerSubscriber);
};
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();
}
this.unsubscribe();
};
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;
var destination = this.destination;
destination.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));
export { MergeScanSubscriber };
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