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from typing import Callable, Iterable, List, Optional, TypeVar, Union
import reactivex
from reactivex import Observable, abc, typing
from reactivex.disposable import CompositeDisposable
from reactivex.internal import default_comparer
_T = TypeVar("_T")
def sequence_equal_(
second: Union[Observable[_T], Iterable[_T]],
comparer: Optional[typing.Comparer[_T]] = None,
) -> Callable[[Observable[_T]], Observable[bool]]:
comparer_ = comparer or default_comparer
second_ = (
reactivex.from_iterable(second) if isinstance(second, Iterable) else second
)
def sequence_equal(source: Observable[_T]) -> Observable[bool]:
"""Determines whether two sequences are equal by comparing the
elements pairwise using a specified equality comparer.
Examples:
>>> res = sequence_equal([1,2,3])
>>> res = sequence_equal([{ "value": 42 }], lambda x, y: x.value == y.value)
>>> res = sequence_equal(reactivex.return_value(42))
>>> res = sequence_equal(
reactivex.return_value({ "value": 42 }),
lambda x, y: x.value == y.value
)
Args:
source: Source observable to compare.
Returns:
An observable sequence that contains a single element which
indicates whether both sequences are of equal length and their
corresponding elements are equal according to the specified
equality comparer.
"""
first = source
def subscribe(
observer: abc.ObserverBase[bool],
scheduler: Optional[abc.SchedulerBase] = None,
):
donel = [False]
doner = [False]
ql: List[_T] = []
qr: List[_T] = []
def on_next1(x: _T) -> None:
if len(qr) > 0:
v = qr.pop(0)
try:
equal = comparer_(v, x)
except Exception as e:
observer.on_error(e)
return
if not equal:
observer.on_next(False)
observer.on_completed()
elif doner[0]:
observer.on_next(False)
observer.on_completed()
else:
ql.append(x)
def on_completed1() -> None:
donel[0] = True
if not ql:
if qr:
observer.on_next(False)
observer.on_completed()
elif doner[0]:
observer.on_next(True)
observer.on_completed()
def on_next2(x: _T):
if len(ql) > 0:
v = ql.pop(0)
try:
equal = comparer_(v, x)
except Exception as exception:
observer.on_error(exception)
return
if not equal:
observer.on_next(False)
observer.on_completed()
elif donel[0]:
observer.on_next(False)
observer.on_completed()
else:
qr.append(x)
def on_completed2():
doner[0] = True
if not qr:
if len(ql) > 0:
observer.on_next(False)
observer.on_completed()
elif donel[0]:
observer.on_next(True)
observer.on_completed()
subscription1 = first.subscribe(
on_next1, observer.on_error, on_completed1, scheduler=scheduler
)
subscription2 = second_.subscribe(
on_next2, observer.on_error, on_completed2, scheduler=scheduler
)
return CompositeDisposable(subscription1, subscription2)
return Observable(subscribe)
return sequence_equal
__all__ = ["sequence_equal_"]
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