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node_modules/rxjs/_esm2015/internal/operators/mergeScan.js

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+import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';
+export function mergeScan(accumulator, seed, concurrent = Number.POSITIVE_INFINITY) {
+    return (source) => source.lift(new MergeScanOperator(accumulator, seed, concurrent));
+}
+export class MergeScanOperator {
+    constructor(accumulator, seed, concurrent) {
+        this.accumulator = accumulator;
+        this.seed = seed;
+        this.concurrent = concurrent;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent));
+    }
+}
+export class MergeScanSubscriber extends SimpleOuterSubscriber {
+    constructor(destination, accumulator, acc, concurrent) {
+        super(destination);
+        this.accumulator = accumulator;
+        this.acc = acc;
+        this.concurrent = concurrent;
+        this.hasValue = false;
+        this.hasCompleted = false;
+        this.buffer = [];
+        this.active = 0;
+        this.index = 0;
+    }
+    _next(value) {
+        if (this.active < this.concurrent) {
+            const index = this.index++;
+            const destination = this.destination;
+            let ish;
+            try {
+                const { accumulator } = this;
+                ish = accumulator(this.acc, value, index);
+            }
+            catch (e) {
+                return destination.error(e);
+            }
+            this.active++;
+            this._innerSub(ish);
+        }
+        else {
+            this.buffer.push(value);
+        }
+    }
+    _innerSub(ish) {
+        const innerSubscriber = new SimpleInnerSubscriber(this);
+        const destination = this.destination;
+        destination.add(innerSubscriber);
+        const innerSubscription = innerSubscribe(ish, innerSubscriber);
+        if (innerSubscription !== innerSubscriber) {
+            destination.add(innerSubscription);
+        }
+    }
+    _complete() {
+        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();
+    }
+    notifyNext(innerValue) {
+        const { destination } = this;
+        this.acc = innerValue;
+        this.hasValue = true;
+        destination.next(innerValue);
+    }
+    notifyComplete() {
+        const buffer = this.buffer;
+        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();
+        }
+    }
+}
+//# sourceMappingURL=mergeScan.js.map