--- /dev/null
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+import { map } from './map';
+import { from } from '../observable/from';
+export function switchMap(project, resultSelector) {
+ if (typeof resultSelector === 'function') {
+ return (source) => source.pipe(switchMap((a, i) => from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii)))));
+ }
+ return (source) => source.lift(new SwitchMapOperator(project));
+}
+class SwitchMapOperator {
+ constructor(project) {
+ this.project = project;
+ }
+ call(subscriber, source) {
+ return source.subscribe(new SwitchMapSubscriber(subscriber, this.project));
+ }
+}
+class SwitchMapSubscriber extends OuterSubscriber {
+ constructor(destination, project) {
+ super(destination);
+ this.project = project;
+ this.index = 0;
+ }
+ _next(value) {
+ let result;
+ const index = this.index++;
+ try {
+ result = this.project(value, index);
+ }
+ catch (error) {
+ this.destination.error(error);
+ return;
+ }
+ this._innerSub(result, value, index);
+ }
+ _innerSub(result, value, index) {
+ const innerSubscription = this.innerSubscription;
+ if (innerSubscription) {
+ innerSubscription.unsubscribe();
+ }
+ const innerSubscriber = new InnerSubscriber(this, value, index);
+ const destination = this.destination;
+ destination.add(innerSubscriber);
+ this.innerSubscription = subscribeToResult(this, result, undefined, undefined, innerSubscriber);
+ if (this.innerSubscription !== innerSubscriber) {
+ destination.add(this.innerSubscription);
+ }
+ }
+ _complete() {
+ const { innerSubscription } = this;
+ if (!innerSubscription || innerSubscription.closed) {
+ super._complete();
+ }
+ this.unsubscribe();
+ }
+ _unsubscribe() {
+ this.innerSubscription = null;
+ }
+ notifyComplete(innerSub) {
+ const destination = this.destination;
+ destination.remove(innerSub);
+ this.innerSubscription = null;
+ if (this.isStopped) {
+ super._complete();
+ }
+ }
+ notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+ this.destination.next(innerValue);
+ }
+}
+//# sourceMappingURL=switchMap.js.map
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