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

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+/** PURE_IMPORTS_START tslib,_util_subscribeToResult,_OuterSubscriber,_InnerSubscriber PURE_IMPORTS_END */
+import * as tslib_1 from "tslib";
+import { subscribeToResult } from '../util/subscribeToResult';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+export function mergeScan(accumulator, seed, concurrent) {
+    if (concurrent === void 0) {
+        concurrent = Number.POSITIVE_INFINITY;
+    }
+    return function (source) { return source.lift(new MergeScanOperator(accumulator, seed, concurrent)); };
+}
+var MergeScanOperator = /*@__PURE__*/ (function () {
+    function MergeScanOperator(accumulator, seed, concurrent) {
+        this.accumulator = accumulator;
+        this.seed = seed;
+        this.concurrent = concurrent;
+    }
+    MergeScanOperator.prototype.call = function (subscriber, source) {
+        return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent));
+    };
+    return MergeScanOperator;
+}());
+export { MergeScanOperator };
+var MergeScanSubscriber = /*@__PURE__*/ (function (_super) {
+    tslib_1.__extends(MergeScanSubscriber, _super);
+    function MergeScanSubscriber(destination, accumulator, acc, concurrent) {
+        var _this = _super.call(this, destination) || this;
+        _this.accumulator = accumulator;
+        _this.acc = acc;
+        _this.concurrent = concurrent;
+        _this.hasValue = false;
+        _this.hasCompleted = false;
+        _this.buffer = [];
+        _this.active = 0;
+        _this.index = 0;
+        return _this;
+    }
+    MergeScanSubscriber.prototype._next = function (value) {
+        if (this.active < this.concurrent) {
+            var index = this.index++;
+            var destination = this.destination;
+            var ish = void 0;
+            try {
+                var accumulator = this.accumulator;
+                ish = accumulator(this.acc, value, index);
+            }
+            catch (e) {
+                return destination.error(e);
+            }
+            this.active++;
+            this._innerSub(ish, value, index);
+        }
+        else {
+            this.buffer.push(value);
+        }
+    };
+    MergeScanSubscriber.prototype._innerSub = function (ish, value, index) {
+        var innerSubscriber = new InnerSubscriber(this, value, index);
+        var destination = this.destination;
+        destination.add(innerSubscriber);
+        var innerSubscription = subscribeToResult(this, ish, undefined, undefined, innerSubscriber);
+        if (innerSubscription !== innerSubscriber) {
+            destination.add(innerSubscription);
+        }
+    };
+    MergeScanSubscriber.prototype._complete = function () {
+        this.hasCompleted = true;
+        if (this.active === 0 && this.buffer.length === 0) {
+            if (this.hasValue === false) {
+                this.destination.next(this.acc);
+            }
+            this.destination.complete();
+        }
+        this.unsubscribe();
+    };
+    MergeScanSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        var destination = this.destination;
+        this.acc = innerValue;
+        this.hasValue = true;
+        destination.next(innerValue);
+    };
+    MergeScanSubscriber.prototype.notifyComplete = function (innerSub) {
+        var buffer = this.buffer;
+        var destination = this.destination;
+        destination.remove(innerSub);
+        this.active--;
+        if (buffer.length > 0) {
+            this._next(buffer.shift());
+        }
+        else if (this.active === 0 && this.hasCompleted) {
+            if (this.hasValue === false) {
+                this.destination.next(this.acc);
+            }
+            this.destination.complete();
+        }
+    };
+    return MergeScanSubscriber;
+}(OuterSubscriber));
+export { MergeScanSubscriber };
+//# sourceMappingURL=mergeScan.js.map