repeatWhen.js
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import { innerFrom } from '../observable/innerFrom';
import { Subject } from '../Subject';
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
export function repeatWhen(notifier) {
return operate((source, subscriber) => {
let innerSub;
let syncResub = false;
let completions$;
let isNotifierComplete = false;
let isMainComplete = false;
const checkComplete = () => isMainComplete && isNotifierComplete && (subscriber.complete(), true);
const getCompletionSubject = () => {
if (!completions$) {
completions$ = new Subject();
innerFrom(notifier(completions$)).subscribe(createOperatorSubscriber(subscriber, () => {
if (innerSub) {
subscribeForRepeatWhen();
}
else {
syncResub = true;
}
}, () => {
isNotifierComplete = true;
checkComplete();
}));
}
return completions$;
};
const subscribeForRepeatWhen = () => {
isMainComplete = false;
innerSub = source.subscribe(createOperatorSubscriber(subscriber, undefined, () => {
isMainComplete = true;
!checkComplete() && getCompletionSubject().next();
}));
if (syncResub) {
innerSub.unsubscribe();
innerSub = null;
syncResub = false;
subscribeForRepeatWhen();
}
};
subscribeForRepeatWhen();
});
}
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