| 1 | /** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */
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| 2 | import * as tslib_1 from "tslib";
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| 3 | import { Subscriber } from '../Subscriber';
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| 4 | export function scan(accumulator, seed) {
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| 5 | var hasSeed = false;
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| 6 | if (arguments.length >= 2) {
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| 7 | hasSeed = true;
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| 8 | }
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| 9 | return function scanOperatorFunction(source) {
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| 10 | return source.lift(new ScanOperator(accumulator, seed, hasSeed));
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| 11 | };
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| 12 | }
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| 13 | var ScanOperator = /*@__PURE__*/ (function () {
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| 14 | function ScanOperator(accumulator, seed, hasSeed) {
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| 15 | if (hasSeed === void 0) {
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| 16 | hasSeed = false;
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| 17 | }
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| 18 | this.accumulator = accumulator;
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| 19 | this.seed = seed;
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| 20 | this.hasSeed = hasSeed;
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| 21 | }
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| 22 | ScanOperator.prototype.call = function (subscriber, source) {
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| 23 | return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));
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| 24 | };
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| 25 | return ScanOperator;
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| 26 | }());
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| 27 | var ScanSubscriber = /*@__PURE__*/ (function (_super) {
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| 28 | tslib_1.__extends(ScanSubscriber, _super);
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| 29 | function ScanSubscriber(destination, accumulator, _seed, hasSeed) {
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| 30 | var _this = _super.call(this, destination) || this;
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| 31 | _this.accumulator = accumulator;
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| 32 | _this._seed = _seed;
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| 33 | _this.hasSeed = hasSeed;
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| 34 | _this.index = 0;
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| 35 | return _this;
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| 36 | }
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| 37 | Object.defineProperty(ScanSubscriber.prototype, "seed", {
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| 38 | get: function () {
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| 39 | return this._seed;
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| 40 | },
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| 41 | set: function (value) {
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| 42 | this.hasSeed = true;
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| 43 | this._seed = value;
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| 44 | },
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| 45 | enumerable: true,
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| 46 | configurable: true
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| 47 | });
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| 48 | ScanSubscriber.prototype._next = function (value) {
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| 49 | if (!this.hasSeed) {
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| 50 | this.seed = value;
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| 51 | this.destination.next(value);
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| 52 | }
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| 53 | else {
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| 54 | return this._tryNext(value);
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| 55 | }
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| 56 | };
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| 57 | ScanSubscriber.prototype._tryNext = function (value) {
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| 58 | var index = this.index++;
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| 59 | var result;
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| 60 | try {
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| 61 | result = this.accumulator(this.seed, value, index);
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| 62 | }
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| 63 | catch (err) {
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| 64 | this.destination.error(err);
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| 65 | }
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| 66 | this.seed = result;
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| 67 | this.destination.next(result);
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| 68 | };
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| 69 | return ScanSubscriber;
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| 70 | }(Subscriber));
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| 71 | //# sourceMappingURL=scan.js.map
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