1 | /** PURE_IMPORTS_START tslib,_Subscriber,_util_ArgumentOutOfRangeError,_observable_empty 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 | import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
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5 | import { empty } from '../observable/empty';
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6 | export function takeLast(count) {
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7 | return function takeLastOperatorFunction(source) {
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8 | if (count === 0) {
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9 | return empty();
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10 | }
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11 | else {
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12 | return source.lift(new TakeLastOperator(count));
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13 | }
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14 | };
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15 | }
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16 | var TakeLastOperator = /*@__PURE__*/ (function () {
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17 | function TakeLastOperator(total) {
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18 | this.total = total;
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19 | if (this.total < 0) {
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20 | throw new ArgumentOutOfRangeError;
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21 | }
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22 | }
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23 | TakeLastOperator.prototype.call = function (subscriber, source) {
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24 | return source.subscribe(new TakeLastSubscriber(subscriber, this.total));
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25 | };
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26 | return TakeLastOperator;
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27 | }());
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28 | var TakeLastSubscriber = /*@__PURE__*/ (function (_super) {
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29 | tslib_1.__extends(TakeLastSubscriber, _super);
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30 | function TakeLastSubscriber(destination, total) {
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31 | var _this = _super.call(this, destination) || this;
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32 | _this.total = total;
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33 | _this.ring = new Array();
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34 | _this.count = 0;
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35 | return _this;
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36 | }
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37 | TakeLastSubscriber.prototype._next = function (value) {
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38 | var ring = this.ring;
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39 | var total = this.total;
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40 | var count = this.count++;
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41 | if (ring.length < total) {
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42 | ring.push(value);
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43 | }
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44 | else {
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45 | var index = count % total;
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46 | ring[index] = value;
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47 | }
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48 | };
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49 | TakeLastSubscriber.prototype._complete = function () {
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50 | var destination = this.destination;
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51 | var count = this.count;
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52 | if (count > 0) {
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53 | var total = this.count >= this.total ? this.total : this.count;
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54 | var ring = this.ring;
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55 | for (var i = 0; i < total; i++) {
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56 | var idx = (count++) % total;
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57 | destination.next(ring[idx]);
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58 | }
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59 | }
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60 | destination.complete();
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61 | };
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62 | return TakeLastSubscriber;
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63 | }(Subscriber));
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64 | //# sourceMappingURL=takeLast.js.map
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