scan.js
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/** 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));
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