65 lines
2.1 KiB
JavaScript
65 lines
2.1 KiB
JavaScript
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/** PURE_IMPORTS_START tslib,_Subscriber,_util_ArgumentOutOfRangeError,_observable_empty 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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import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
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import { empty } from '../observable/empty';
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export function takeLast(count) {
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return function takeLastOperatorFunction(source) {
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if (count === 0) {
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return empty();
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}
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else {
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return source.lift(new TakeLastOperator(count));
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}
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};
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}
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var TakeLastOperator = /*@__PURE__*/ (function () {
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function TakeLastOperator(total) {
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this.total = total;
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if (this.total < 0) {
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throw new ArgumentOutOfRangeError;
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}
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}
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TakeLastOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new TakeLastSubscriber(subscriber, this.total));
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};
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return TakeLastOperator;
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}());
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var TakeLastSubscriber = /*@__PURE__*/ (function (_super) {
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tslib_1.__extends(TakeLastSubscriber, _super);
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function TakeLastSubscriber(destination, total) {
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var _this = _super.call(this, destination) || this;
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_this.total = total;
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_this.ring = new Array();
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_this.count = 0;
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return _this;
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}
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TakeLastSubscriber.prototype._next = function (value) {
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var ring = this.ring;
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var total = this.total;
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var count = this.count++;
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if (ring.length < total) {
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ring.push(value);
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}
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else {
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var index = count % total;
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ring[index] = value;
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}
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};
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TakeLastSubscriber.prototype._complete = function () {
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var destination = this.destination;
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var count = this.count;
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if (count > 0) {
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var total = this.count >= this.total ? this.total : this.count;
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var ring = this.ring;
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for (var i = 0; i < total; i++) {
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var idx = (count++) % total;
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destination.next(ring[idx]);
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}
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}
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destination.complete();
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};
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return TakeLastSubscriber;
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}(Subscriber));
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//# sourceMappingURL=takeLast.js.map
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