# 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)
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# ← Prev: _frozen.py Current: _bidict.py Next: _orderedbase.py →
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"""Provide :class:`MutableBidict` and :class:`bidict`."""
from __future__ import annotations
import typing as t
from ._abc import MutableBidirectionalMapping
from ._base import BidictBase
from ._dup import ON_DUP_DROP_OLD
from ._dup import ON_DUP_RAISE
from ._dup import OnDup
from ._typing import DT
from ._typing import KT
from ._typing import MISSING
from ._typing import ODT
from ._typing import VT
from ._typing import MapOrItems
class MutableBidict(BidictBase[KT, VT], MutableBidirectionalMapping[KT, VT]):
"""Base class for mutable bidirectional mappings."""
if t.TYPE_CHECKING:
@property
def inverse(self) -> MutableBidict[VT, KT]: ...
@property
def inv(self) -> MutableBidict[VT, KT]: ...
def _pop(self, key: KT) -> VT:
val = self._fwdm.pop(key)
del self._invm[val]
return val
[docs]
def __delitem__(self, key: KT) -> None:
"""*x.__delitem__(y) ⟺ del x[y]*"""
self._pop(key)
[docs]
def __setitem__(self, key: KT, val: VT) -> None:
"""Set the value for *key* to *val*.
If *key* is already associated with *val*, this is a no-op.
If *key* is already associated with a different value,
the old value will be replaced with *val*,
as with dict's :meth:`__setitem__`.
If *val* is already associated with a different key,
an exception is raised
to protect against accidental removal of the key
that's currently associated with *val*.
Use :meth:`put` instead if you want to specify different behavior in
the case that the provided key or value duplicates an existing one.
Or use :meth:`forceput` to unconditionally associate *key* with *val*,
replacing any existing items as necessary to preserve uniqueness.
:raises bidict.ValueDuplicationError: if *val* duplicates that of an
existing item.
:raises bidict.KeyAndValueDuplicationError: if *key* duplicates the key of an
existing item and *val* duplicates the value of a different
existing item.
"""
self.put(key, val, on_dup=self.on_dup)
[docs]
def put(self, key: KT, val: VT, on_dup: OnDup = ON_DUP_RAISE) -> None:
"""Associate *key* with *val*, honoring the :class:`OnDup` given in *on_dup*.
For example, if *on_dup* is :attr:`~bidict.ON_DUP_RAISE`,
then *key* will be associated with *val* if and only if
*key* is not already associated with an existing value and
*val* is not already associated with an existing key,
otherwise an exception will be raised.
If *key* is already associated with *val*, this is a no-op.
:raises bidict.KeyDuplicationError: if attempting to insert an item
whose key only duplicates an existing item's, and *on_dup.key* is
:attr:`~bidict.RAISE`.
:raises bidict.ValueDuplicationError: if attempting to insert an item
whose value only duplicates an existing item's, and *on_dup.val* is
:attr:`~bidict.RAISE`.
:raises bidict.KeyAndValueDuplicationError: if attempting to insert an
item whose key duplicates one existing item's, and whose value
duplicates another existing item's, and *on_dup.val* is
:attr:`~bidict.RAISE`.
"""
self._update(((key, val),), on_dup=on_dup)
[docs]
def forceput(self, key: KT, val: VT) -> None:
"""Associate *key* with *val* unconditionally.
Replace any existing mappings containing key *key* or value *val*
as necessary to preserve uniqueness.
"""
self.put(key, val, on_dup=ON_DUP_DROP_OLD)
[docs]
def clear(self) -> None:
"""Remove all items."""
self._fwdm.clear()
self._invm.clear()
@t.overload
def pop(self, key: KT, /) -> VT: ...
@t.overload
def pop(self, key: KT, default: DT = ..., /) -> VT | DT: ...
[docs]
def pop(self, key: KT, default: ODT[DT] = MISSING, /) -> VT | DT:
"""*x.pop(k[, d]) → v*
Remove specified key and return the corresponding value.
:raises KeyError: if *key* is not found and no *default* is provided.
"""
try:
return self._pop(key)
except KeyError:
if default is MISSING:
raise
return default
[docs]
def popitem(self) -> tuple[KT, VT]:
"""*x.popitem() → (k, v)*
Remove and return some item as a (key, value) pair.
:raises KeyError: if *x* is empty.
"""
key, val = self._fwdm.popitem()
del self._invm[val]
return key, val
[docs]
def update(self, arg: MapOrItems[KT, VT] = (), /, **kw: VT) -> None:
"""Like calling :meth:`putall` with *self.on_dup* passed for *on_dup*."""
self._update(arg, kw=kw)
[docs]
def forceupdate(self, arg: MapOrItems[KT, VT] = (), /, **kw: VT) -> None:
"""Like a bulk :meth:`forceput`."""
self._update(arg, kw=kw, on_dup=ON_DUP_DROP_OLD)
[docs]
def putall(self, items: MapOrItems[KT, VT], on_dup: OnDup = ON_DUP_RAISE) -> None:
"""Like a bulk :meth:`put`.
If one of the given items causes an exception to be raised,
none of the items is inserted.
"""
self._update(items, on_dup=on_dup)
# other's type is Mapping rather than Maplike since bidict() |= SupportsKeysAndGetItem({})
# raises a TypeError, just like dict() |= SupportsKeysAndGetItem({}) does.
[docs]
def __ior__(self, other: t.Mapping[KT, VT]) -> MutableBidict[KT, VT]:
"""Return self|=other."""
self.update(other)
return self
class bidict(MutableBidict[KT, VT]):
"""The main bidirectional mapping type.
See :ref:`intro:Introduction` and :ref:`basic-usage:Basic Usage`
to get started (also available at https://bidict.rtfd.io).
"""
if t.TYPE_CHECKING:
@property
def inverse(self) -> bidict[VT, KT]: ...
@property
def inv(self) -> bidict[VT, KT]: ...
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