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node_modules/rxjs/_esm5/internal/operators/takeLast.js

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