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from __future__ import annotations as _annotations
import collections.abc as _c
import typing as _t
_T_co = _t.TypeVar('_T_co', covariant=True)
class SequenceProxy(_c.Sequence[_T_co]):
"""A read-only sequence proxy."""
# DTFIX5: needs unit test coverage
__slots__ = ('__value',)
def __init__(self, value: _c.Sequence[_T_co]) -> None:
self.__value = value
@_t.overload
def __getitem__(self, index: int) -> _T_co: ...
@_t.overload
def __getitem__(self, index: slice) -> _c.Sequence[_T_co]: ...
def __getitem__(self, index: int | slice) -> _T_co | _c.Sequence[_T_co]:
if isinstance(index, slice):
return self.__class__(self.__value[index])
return self.__value[index]
def __len__(self) -> int:
return len(self.__value)
def __contains__(self, item: object) -> bool:
return item in self.__value
def __iter__(self) -> _t.Iterator[_T_co]:
yield from self.__value
def __reversed__(self) -> _c.Iterator[_T_co]:
return reversed(self.__value)
def index(self, *args) -> int:
return self.__value.index(*args)
def count(self, value: object) -> int:
return self.__value.count(value)
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