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import logging
from typing import Any, Callable, Optional, Tuple, TypeVar
from reactivex import Observable, abc, empty
from reactivex import operators as ops
from reactivex.disposable import (
CompositeDisposable,
RefCountDisposable,
SerialDisposable,
SingleAssignmentDisposable,
)
from reactivex.internal import add_ref, noop
from reactivex.subject import Subject
log = logging.getLogger("Rx")
_T = TypeVar("_T")
def window_toggle_(
openings: Observable[Any], closing_mapper: Callable[[Any], Observable[Any]]
) -> Callable[[Observable[_T]], Observable[Observable[_T]]]:
"""Projects each element of an observable sequence into zero or
more windows.
Args:
source: Source observable to project into windows.
Returns:
An observable sequence of windows.
"""
def window_toggle(source: Observable[_T]) -> Observable[Observable[_T]]:
def mapper(args: Tuple[Any, Observable[_T]]):
_, window = args
return window
return openings.pipe(
ops.group_join(
source,
closing_mapper,
lambda _: empty(),
),
ops.map(mapper),
)
return window_toggle
def window_(
boundaries: Observable[Any],
) -> Callable[[Observable[_T]], Observable[Observable[_T]]]:
"""Projects each element of an observable sequence into zero or
more windows.
Args:
source: Source observable to project into windows.
Returns:
An observable sequence of windows.
"""
def window(source: Observable[_T]) -> Observable[Observable[_T]]:
def subscribe(
observer: abc.ObserverBase[Observable[_T]],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
window_subject: Subject[_T] = Subject()
d = CompositeDisposable()
r = RefCountDisposable(d)
observer.on_next(add_ref(window_subject, r))
def on_next_window(x: _T) -> None:
window_subject.on_next(x)
def on_error(err: Exception) -> None:
window_subject.on_error(err)
observer.on_error(err)
def on_completed() -> None:
window_subject.on_completed()
observer.on_completed()
d.add(
source.subscribe(
on_next_window, on_error, on_completed, scheduler=scheduler
)
)
def on_next_observer(w: Observable[_T]):
nonlocal window_subject
window_subject.on_completed()
window_subject = Subject()
observer.on_next(add_ref(window_subject, r))
d.add(
boundaries.subscribe(
on_next_observer, on_error, on_completed, scheduler=scheduler
)
)
return r
return Observable(subscribe)
return window
def window_when_(
closing_mapper: Callable[[], Observable[Any]]
) -> Callable[[Observable[_T]], Observable[Observable[_T]]]:
"""Projects each element of an observable sequence into zero or
more windows.
Args:
source: Source observable to project into windows.
Returns:
An observable sequence of windows.
"""
def window_when(source: Observable[_T]) -> Observable[Observable[_T]]:
def subscribe(
observer: abc.ObserverBase[Observable[_T]],
scheduler: Optional[abc.SchedulerBase] = None,
):
m = SerialDisposable()
d = CompositeDisposable(m)
r = RefCountDisposable(d)
window: Subject[_T] = Subject()
observer.on_next(add_ref(window, r))
def on_next(value: _T) -> None:
window.on_next(value)
def on_error(error: Exception) -> None:
window.on_error(error)
observer.on_error(error)
def on_completed() -> None:
window.on_completed()
observer.on_completed()
d.add(
source.subscribe(on_next, on_error, on_completed, scheduler=scheduler)
)
def create_window_on_completed():
try:
window_close = closing_mapper()
except Exception as exception:
observer.on_error(exception)
return
def on_completed():
nonlocal window
window.on_completed()
window = Subject()
observer.on_next(add_ref(window, r))
create_window_on_completed()
m1 = SingleAssignmentDisposable()
m.disposable = m1
m1.disposable = window_close.pipe(ops.take(1)).subscribe(
noop, on_error, on_completed, scheduler=scheduler
)
create_window_on_completed()
return r
return Observable(subscribe)
return window_when
__all__ = ["window_", "window_when_", "window_toggle_"]
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