mirror of
https://github.com/morpheus65535/bazarr.git
synced 2024-11-10 17:13:35 +08:00
79 lines
3.1 KiB
Python
79 lines
3.1 KiB
Python
# Copyright 2009-2024 Joshua Bronson. All rights reserved.
|
|
#
|
|
# This Source Code Form is subject to the terms of the Mozilla Public
|
|
# License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
|
|
# * Code review nav *
|
|
# (see comments in __init__.py)
|
|
# ============================================================================
|
|
# ← Prev: __init__.py Current: _abc.py Next: _base.py →
|
|
# ============================================================================
|
|
|
|
|
|
"""Provide the :class:`BidirectionalMapping` abstract base class."""
|
|
|
|
from __future__ import annotations
|
|
|
|
import typing as t
|
|
from abc import abstractmethod
|
|
|
|
from ._typing import KT
|
|
from ._typing import VT
|
|
|
|
|
|
class BidirectionalMapping(t.Mapping[KT, VT]):
|
|
"""Abstract base class for bidirectional mapping types.
|
|
|
|
Extends :class:`collections.abc.Mapping` primarily by adding the
|
|
(abstract) :attr:`inverse` property,
|
|
which implementers of :class:`BidirectionalMapping`
|
|
should override to return a reference to the inverse
|
|
:class:`BidirectionalMapping` instance.
|
|
"""
|
|
|
|
__slots__ = ()
|
|
|
|
@property
|
|
@abstractmethod
|
|
def inverse(self) -> BidirectionalMapping[VT, KT]:
|
|
"""The inverse of this bidirectional mapping instance.
|
|
|
|
*See also* :attr:`bidict.BidictBase.inverse`, :attr:`bidict.BidictBase.inv`
|
|
|
|
:raises NotImplementedError: Meant to be overridden in subclasses.
|
|
"""
|
|
# The @abstractmethod decorator prevents subclasses from being instantiated unless they
|
|
# override this method. But an overriding implementation may merely return super().inverse,
|
|
# in which case this implementation is used. Raise NotImplementedError to indicate that
|
|
# subclasses must actually provide their own implementation.
|
|
raise NotImplementedError
|
|
|
|
def __inverted__(self) -> t.Iterator[tuple[VT, KT]]:
|
|
"""Get an iterator over the items in :attr:`inverse`.
|
|
|
|
This is functionally equivalent to iterating over the items in the
|
|
forward mapping and inverting each one on the fly, but this provides a
|
|
more efficient implementation: Assuming the already-inverted items
|
|
are stored in :attr:`inverse`, just return an iterator over them directly.
|
|
|
|
Providing this default implementation enables external functions,
|
|
particularly :func:`~bidict.inverted`, to use this optimized
|
|
implementation when available, instead of having to invert on the fly.
|
|
|
|
*See also* :func:`bidict.inverted`
|
|
"""
|
|
return iter(self.inverse.items())
|
|
|
|
|
|
class MutableBidirectionalMapping(BidirectionalMapping[KT, VT], t.MutableMapping[KT, VT]):
|
|
"""Abstract base class for mutable bidirectional mapping types."""
|
|
|
|
__slots__ = ()
|
|
|
|
|
|
# * Code review nav *
|
|
# ============================================================================
|
|
# ← Prev: __init__.py Current: _abc.py Next: _base.py →
|
|
# ============================================================================
|