var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) Eif (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Subscriber_1 = require('../Subscriber');
var tryCatch_1 = require('../util/tryCatch');
var errorObject_1 = require('../util/errorObject');
function scan(accumulator, seed) {
return this.lift(new ScanOperator(accumulator, seed));
}
exports.scan = scan;
var ScanOperator = (function () {
function ScanOperator(accumulator, seed) {
this.accumulator = accumulator;
this.seed = seed;
}
ScanOperator.prototype.call = function (subscriber) {
return new ScanSubscriber(subscriber, this.accumulator, this.seed);
};
return ScanOperator;
})();
var ScanSubscriber = (function (_super) {
__extends(ScanSubscriber, _super);
function ScanSubscriber(destination, accumulator, seed) {
_super.call(this, destination);
this.accumulator = accumulator;
this.accumulatorSet = false;
this.seed = seed;
this.accumulator = accumulator;
this.accumulatorSet = typeof seed !== 'undefined';
}
Object.defineProperty(ScanSubscriber.prototype, "seed", {
get: function () {
return this._seed;
},
set: function (value) {
this.accumulatorSet = true;
this._seed = value;
},
enumerable: true,
configurable: true
});
ScanSubscriber.prototype._next = function (value) {
if (!this.accumulatorSet) {
this.seed = value;
this.destination.next(value);
}
else {
var result = tryCatch_1.tryCatch(this.accumulator).call(this, this.seed, value);
if (result === errorObject_1.errorObject) {
this.destination.error(errorObject_1.errorObject.e);
}
else {
this.seed = result;
this.destination.next(this.seed);
}
}
};
return ScanSubscriber;
})(Subscriber_1.Subscriber);
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