/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */
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import * as tslib_1 from "tslib";
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import { Subscriber } from '../Subscriber';
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export 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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var ScanOperator = /*@__PURE__*/ (function () {
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function ScanOperator(accumulator, seed, hasSeed) {
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if (hasSeed === void 0) {
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hasSeed = false;
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}
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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 = /*@__PURE__*/ (function (_super) {
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tslib_1.__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));
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//# sourceMappingURL=scan.js.map
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