| /** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */ |
| import * as tslib_1 from "tslib"; |
| import { Subscriber } from '../Subscriber'; |
| export function scan(accumulator, seed) { |
| var hasSeed = false; |
| if (arguments.length >= 2) { |
| hasSeed = true; |
| } |
| return function scanOperatorFunction(source) { |
| return source.lift(new ScanOperator(accumulator, seed, hasSeed)); |
| }; |
| } |
| var ScanOperator = /*@__PURE__*/ (function () { |
| function ScanOperator(accumulator, seed, hasSeed) { |
| if (hasSeed === void 0) { |
| hasSeed = false; |
| } |
| this.accumulator = accumulator; |
| this.seed = seed; |
| this.hasSeed = hasSeed; |
| } |
| ScanOperator.prototype.call = function (subscriber, source) { |
| return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed)); |
| }; |
| return ScanOperator; |
| }()); |
| var ScanSubscriber = /*@__PURE__*/ (function (_super) { |
| tslib_1.__extends(ScanSubscriber, _super); |
| function ScanSubscriber(destination, accumulator, _seed, hasSeed) { |
| var _this = _super.call(this, destination) || this; |
| _this.accumulator = accumulator; |
| _this._seed = _seed; |
| _this.hasSeed = hasSeed; |
| _this.index = 0; |
| return _this; |
| } |
| Object.defineProperty(ScanSubscriber.prototype, "seed", { |
| get: function () { |
| return this._seed; |
| }, |
| set: function (value) { |
| this.hasSeed = true; |
| this._seed = value; |
| }, |
| enumerable: true, |
| configurable: true |
| }); |
| ScanSubscriber.prototype._next = function (value) { |
| if (!this.hasSeed) { |
| this.seed = value; |
| this.destination.next(value); |
| } |
| else { |
| return this._tryNext(value); |
| } |
| }; |
| ScanSubscriber.prototype._tryNext = function (value) { |
| var index = this.index++; |
| var result; |
| try { |
| result = this.accumulator(this.seed, value, index); |
| } |
| catch (err) { |
| this.destination.error(err); |
| } |
| this.seed = result; |
| this.destination.next(result); |
| }; |
| return ScanSubscriber; |
| }(Subscriber)); |
| //# sourceMappingURL=scan.js.map |