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

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+import { subscribeToResult } from '../util/subscribeToResult';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { map } from './map';
+import { from } from '../observable/from';
+export function mergeMap(project, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
+    if (typeof resultSelector === 'function') {
+        return (source) => source.pipe(mergeMap((a, i) => from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii))), concurrent));
+    }
+    else if (typeof resultSelector === 'number') {
+        concurrent = resultSelector;
+    }
+    return (source) => source.lift(new MergeMapOperator(project, concurrent));
+}
+export class MergeMapOperator {
+    constructor(project, concurrent = Number.POSITIVE_INFINITY) {
+        this.project = project;
+        this.concurrent = concurrent;
+    }
+    call(observer, source) {
+        return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));
+    }
+}
+export class MergeMapSubscriber extends OuterSubscriber {
+    constructor(destination, project, concurrent = Number.POSITIVE_INFINITY) {
+        super(destination);
+        this.project = project;
+        this.concurrent = concurrent;
+        this.hasCompleted = false;
+        this.buffer = [];
+        this.active = 0;
+        this.index = 0;
+    }
+    _next(value) {
+        if (this.active < this.concurrent) {
+            this._tryNext(value);
+        }
+        else {
+            this.buffer.push(value);
+        }
+    }
+    _tryNext(value) {
+        let result;
+        const index = this.index++;
+        try {
+            result = this.project(value, index);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.active++;
+        this._innerSub(result, value, index);
+    }
+    _innerSub(ish, value, index) {
+        const innerSubscriber = new InnerSubscriber(this, value, index);
+        const destination = this.destination;
+        destination.add(innerSubscriber);
+        const innerSubscription = subscribeToResult(this, ish, undefined, undefined, innerSubscriber);
+        if (innerSubscription !== innerSubscriber) {
+            destination.add(innerSubscription);
+        }
+    }
+    _complete() {
+        this.hasCompleted = true;
+        if (this.active === 0 && this.buffer.length === 0) {
+            this.destination.complete();
+        }
+        this.unsubscribe();
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        this.destination.next(innerValue);
+    }
+    notifyComplete(innerSub) {
+        const buffer = this.buffer;
+        this.remove(innerSub);
+        this.active--;
+        if (buffer.length > 0) {
+            this._next(buffer.shift());
+        }
+        else if (this.active === 0 && this.hasCompleted) {
+            this.destination.complete();
+        }
+    }
+}
+//# sourceMappingURL=mergeMap.js.map