| /** PURE_IMPORTS_START tslib,_innerSubscribe PURE_IMPORTS_END */ | 
| import * as tslib_1 from "tslib"; | 
| import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe'; | 
| 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); | 
|         } | 
|         else { | 
|             this.buffer.push(value); | 
|         } | 
|     }; | 
|     MergeScanSubscriber.prototype._innerSub = function (ish) { | 
|         var innerSubscriber = new SimpleInnerSubscriber(this); | 
|         var destination = this.destination; | 
|         destination.add(innerSubscriber); | 
|         var innerSubscription = innerSubscribe(ish, innerSubscriber); | 
|         if (innerSubscription !== innerSubscriber) { | 
|             destination.add(innerSubscription); | 
|         } | 
|     }; | 
|     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 (innerValue) { | 
|         var destination = this.destination; | 
|         this.acc = innerValue; | 
|         this.hasValue = true; | 
|         destination.next(innerValue); | 
|     }; | 
|     MergeScanSubscriber.prototype.notifyComplete = function () { | 
|         var buffer = this.buffer; | 
|         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; | 
| }(SimpleOuterSubscriber)); | 
| export { MergeScanSubscriber }; | 
| //# sourceMappingURL=mergeScan.js.map |