83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
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"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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}
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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var Subscriber_1 = require("../Subscriber");
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function scan(accumulator, seed) {
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var hasSeed = false;
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if (arguments.length >= 2) {
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hasSeed = true;
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}
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return function scanOperatorFunction(source) {
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return source.lift(new ScanOperator(accumulator, seed, hasSeed));
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};
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}
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exports.scan = scan;
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var ScanOperator = (function () {
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function ScanOperator(accumulator, seed, hasSeed) {
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if (hasSeed === void 0) { hasSeed = false; }
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this.accumulator = accumulator;
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this.seed = seed;
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this.hasSeed = hasSeed;
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}
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ScanOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));
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};
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return ScanOperator;
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}());
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var ScanSubscriber = (function (_super) {
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__extends(ScanSubscriber, _super);
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function ScanSubscriber(destination, accumulator, _seed, hasSeed) {
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var _this = _super.call(this, destination) || this;
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_this.accumulator = accumulator;
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_this._seed = _seed;
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_this.hasSeed = hasSeed;
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_this.index = 0;
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return _this;
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}
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Object.defineProperty(ScanSubscriber.prototype, "seed", {
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get: function () {
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return this._seed;
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},
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set: function (value) {
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this.hasSeed = true;
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this._seed = value;
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},
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enumerable: true,
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configurable: true
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});
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ScanSubscriber.prototype._next = function (value) {
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if (!this.hasSeed) {
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this.seed = value;
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this.destination.next(value);
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}
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else {
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return this._tryNext(value);
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}
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};
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ScanSubscriber.prototype._tryNext = function (value) {
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var index = this.index++;
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var result;
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try {
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result = this.accumulator(this.seed, value, index);
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}
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catch (err) {
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this.destination.error(err);
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}
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this.seed = result;
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this.destination.next(result);
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};
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return ScanSubscriber;
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}(Subscriber_1.Subscriber));
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//# sourceMappingURL=scan.js.map
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