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import { tryCatch } from '../util/tryCatch';
import { errorObject } from '../util/errorObject';
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
export function expand(project, concurrent = Number.POSITIVE_INFINITY, scheduler = undefined) {
concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
return (source) => source.lift(new ExpandOperator(project, concurrent, scheduler));
}
export class ExpandOperator {
constructor(project, concurrent, scheduler) {
this.project = project;
this.concurrent = concurrent;
this.scheduler = scheduler;
}
call(subscriber, source) {
return source.subscribe(new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler));
}
}
export class ExpandSubscriber extends OuterSubscriber {
constructor(destination, project, concurrent, scheduler) {
super(destination);
this.project = project;
this.concurrent = concurrent;
this.scheduler = scheduler;
this.index = 0;
this.active = 0;
this.hasCompleted = false;
if (concurrent < Number.POSITIVE_INFINITY) {
this.buffer = [];
}
}
static dispatch(arg) {
const { subscriber, result, value, index } = arg;
subscriber.subscribeToProjection(result, value, index);
}
_next(value) {
const destination = this.destination;
if (destination.closed) {
this._complete();
return;
}
const index = this.index++;
if (this.active < this.concurrent) {
destination.next(value);
let result = tryCatch(this.project)(value, index);
if (result === errorObject) {
destination.error(errorObject.e);
}
else if (!this.scheduler) {
this.subscribeToProjection(result, value, index);
}
else {
const state = { subscriber: this, result, value, index };
this.add(this.scheduler.schedule(ExpandSubscriber.dispatch, 0, state));
}
}
else {
this.buffer.push(value);
}
}
subscribeToProjection(result, value, index) {
this.active++;
this.add(subscribeToResult(this, result, value, index));
}
_complete() {
this.hasCompleted = true;
if (this.hasCompleted && this.active === 0) {
this.destination.complete();
}
}
notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
this._next(innerValue);
}
notifyComplete(innerSub) {
const buffer = this.buffer;
this.remove(innerSub);
this.active--;
if (buffer && buffer.length > 0) {
this._next(buffer.shift());
}
if (this.hasCompleted && this.active === 0) {
this.destination.complete();
}
}
}
//# sourceMappingURL=expand.js.map
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