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firestar5683
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
from typing import Callable, List, Optional, TypeVar
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from reactivex import Observable, abc
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_T = TypeVar("_T")
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def skip_last_(count: int) -> Callable[[Observable[_T]], Observable[_T]]:
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def skip_last(source: Observable[_T]) -> Observable[_T]:
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"""Bypasses a specified number of elements at the end of an
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observable sequence.
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This operator accumulates a queue with a length enough to store
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the first `count` elements. As more elements are received,
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elements are taken from the front of the queue and produced on
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the result sequence. This causes elements to be delayed.
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Args:
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count: Number of elements to bypass at the end of the
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source sequence.
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Returns:
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An observable sequence containing the source sequence
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elements except for the bypassed ones at the end.
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"""
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def subscribe(
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observer: abc.ObserverBase[_T],
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scheduler: Optional[abc.SchedulerBase] = None,
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):
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q: List[_T] = []
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def on_next(value: _T) -> None:
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front = None
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with source.lock:
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q.append(value)
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if len(q) > count:
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front = q.pop(0)
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if front is not None:
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observer.on_next(front)
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return source.subscribe(
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on_next, observer.on_error, observer.on_completed, scheduler=scheduler
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)
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return Observable(subscribe)
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return skip_last
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__all__ = ["skip_last_"]
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