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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, undefined, undefined);
const destination = this.destination;
destination.add(innerSubscriber);
subscribeToResult(this, ish, value, index, innerSubscriber);
}
_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
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