/**
* @param \Rx\ObservableInterface $observable
* @param \Rx\ObserverInterface $observer
* @param \Rx\SchedulerInterface $scheduler
* @return \Rx\DisposableInterface
*/
public function __invoke(ObservableInterface $observable, ObserverInterface $observer, SchedulerInterface $scheduler = null)
{
$buffer = "";
return $observable->defaultIfEmpty(Observable::just(null))->concat(Observable::just($this->delimiter))->concatMap(function ($x) use(&$buffer) {
if ($x === null || $buffer === null) {
$buffer = null;
return Observable::emptyObservable();
}
$items = explode($this->delimiter, $buffer . $x);
$buffer = array_pop($items);
return Observable::fromArray($items);
})->subscribe($observer, $scheduler);
}
