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