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from typing import Callable, Optional, TypeVar, Union
from reactivex import Observable, abc
_T = TypeVar("_T")
def find_value_(
predicate: Callable[[_T, int, Observable[_T]], bool], yield_index: bool
) -> Callable[[Observable[_T]], Observable[Union[_T, int, None]]]:
def find_value(source: Observable[_T]) -> Observable[Union[_T, int, None]]:
def subscribe(
observer: abc.ObserverBase[Union[_T, int, None]],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
index = 0
def on_next(x: _T) -> None:
nonlocal index
should_run = False
try:
should_run = predicate(x, index, source)
except Exception as ex: # pylint: disable=broad-except
observer.on_error(ex)
return
if should_run:
observer.on_next(index if yield_index else x)
observer.on_completed()
else:
index += 1
def on_completed():
observer.on_next(-1 if yield_index else None)
observer.on_completed()
return source.subscribe(
on_next, observer.on_error, on_completed, scheduler=scheduler
)
return Observable(subscribe)
return find_value
__all__ = ["find_value_"]
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