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import { Observable } from '../Observable';
import { SchedulerLike } from '../types';
import { Subscription } from '../Subscription';
import { iterator as Symbol_iterator } from '../symbol/iterator';
import { subscribeToIterable } from '../util/subscribeToIterable';
export function fromIterable<T>(input: Iterable<T>, scheduler: SchedulerLike) {
if (!input) {
throw new Error('Iterable cannot be null');
}
if (!scheduler) {
return new Observable<T>(subscribeToIterable(input));
} else {
return new Observable<T>(subscriber => {
const sub = new Subscription();
let iterator: Iterator<T>;
sub.add(() => {
// Finalize generators
if (iterator && typeof iterator.return === 'function') {
iterator.return();
}
});
sub.add(scheduler.schedule(() => {
iterator = input[Symbol_iterator]();
sub.add(scheduler.schedule(function () {
if (subscriber.closed) {
return;
}
let value: T;
let done: boolean;
try {
const result = iterator.next();
value = result.value;
done = result.done;
} catch (err) {
subscriber.error(err);
return;
}
if (done) {
subscriber.complete();
} else {
subscriber.next(value);
this.schedule();
}
}));
}));
return sub;
});
}
}
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