mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-28 02:27:28 +00:00
177 lines
6.6 KiB
Python
177 lines
6.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2009-2019 Joshua Bronson. All Rights Reserved.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#==============================================================================
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# * Welcome to the bidict source code *
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#==============================================================================
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# Doing a code review? You'll find a "Code review nav" comment like the one
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# below at the top and bottom of the most important source files. This provides
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# a suggested initial path through the source when reviewing.
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#
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# Note: If you aren't reading this on https://github.com/jab/bidict, you may be
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# viewing an outdated version of the code. Please head to GitHub to review the
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# latest version, which contains important improvements over older versions.
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#
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# Thank you for reading and for any feedback you provide.
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# * Code review nav *
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#==============================================================================
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# ← Prev: _frozenbidict.py Current: _mut.py Next: _bidict.py →
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#==============================================================================
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"""Provides :class:`bidict`."""
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from ._base import BidictBase
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from ._dup import OVERWRITE, RAISE, _OnDup
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from ._miss import _MISS
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from .compat import MutableMapping
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# Extend MutableMapping explicitly because it doesn't implement __subclasshook__, as well as to
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# inherit method implementations it provides that we can reuse (namely `setdefault`).
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class MutableBidict(BidictBase, MutableMapping):
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"""Base class for mutable bidirectional mappings."""
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__slots__ = ()
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__hash__ = None # since this class is mutable; explicit > implicit.
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_ON_DUP_OVERWRITE = _OnDup(key=OVERWRITE, val=OVERWRITE, kv=OVERWRITE)
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def __delitem__(self, key):
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u"""*x.__delitem__(y) ⟺ del x[y]*"""
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self._pop(key)
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def __setitem__(self, key, val):
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"""
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Set the value for *key* to *val*.
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If *key* is already associated with *val*, this is a no-op.
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If *key* is already associated with a different value,
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the old value will be replaced with *val*,
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as with dict's :meth:`__setitem__`.
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If *val* is already associated with a different key,
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an exception is raised
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to protect against accidental removal of the key
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that's currently associated with *val*.
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Use :meth:`put` instead if you want to specify different policy in
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the case that the provided key or value duplicates an existing one.
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Or use :meth:`forceput` to unconditionally associate *key* with *val*,
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replacing any existing items as necessary to preserve uniqueness.
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:raises bidict.ValueDuplicationError: if *val* duplicates that of an
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existing item.
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:raises bidict.KeyAndValueDuplicationError: if *key* duplicates the key of an
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existing item and *val* duplicates the value of a different
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existing item.
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"""
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on_dup = self._get_on_dup()
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self._put(key, val, on_dup)
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def put(self, key, val, on_dup_key=RAISE, on_dup_val=RAISE, on_dup_kv=None):
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"""
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Associate *key* with *val* with the specified duplication policies.
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If *on_dup_kv* is ``None``, the *on_dup_val* policy will be used for it.
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For example, if all given duplication policies are :attr:`~bidict.RAISE`,
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then *key* will be associated with *val* if and only if
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*key* is not already associated with an existing value and
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*val* is not already associated with an existing key,
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otherwise an exception will be raised.
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If *key* is already associated with *val*, this is a no-op.
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:raises bidict.KeyDuplicationError: if attempting to insert an item
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whose key only duplicates an existing item's, and *on_dup_key* is
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:attr:`~bidict.RAISE`.
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:raises bidict.ValueDuplicationError: if attempting to insert an item
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whose value only duplicates an existing item's, and *on_dup_val* is
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:attr:`~bidict.RAISE`.
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:raises bidict.KeyAndValueDuplicationError: if attempting to insert an
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item whose key duplicates one existing item's, and whose value
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duplicates another existing item's, and *on_dup_kv* is
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:attr:`~bidict.RAISE`.
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"""
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on_dup = self._get_on_dup((on_dup_key, on_dup_val, on_dup_kv))
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self._put(key, val, on_dup)
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def forceput(self, key, val):
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"""
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Associate *key* with *val* unconditionally.
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Replace any existing mappings containing key *key* or value *val*
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as necessary to preserve uniqueness.
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"""
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self._put(key, val, self._ON_DUP_OVERWRITE)
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def clear(self):
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"""Remove all items."""
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self._fwdm.clear()
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self._invm.clear()
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def pop(self, key, default=_MISS):
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u"""*x.pop(k[, d]) → v*
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Remove specified key and return the corresponding value.
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:raises KeyError: if *key* is not found and no *default* is provided.
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"""
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try:
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return self._pop(key)
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except KeyError:
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if default is _MISS:
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raise
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return default
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def popitem(self):
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u"""*x.popitem() → (k, v)*
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Remove and return some item as a (key, value) pair.
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:raises KeyError: if *x* is empty.
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"""
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if not self:
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raise KeyError('mapping is empty')
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key, val = self._fwdm.popitem()
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del self._invm[val]
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return key, val
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def update(self, *args, **kw):
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"""Like :meth:`putall` with default duplication policies."""
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if args or kw:
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self._update(False, None, *args, **kw)
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def forceupdate(self, *args, **kw):
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"""Like a bulk :meth:`forceput`."""
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self._update(False, self._ON_DUP_OVERWRITE, *args, **kw)
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def putall(self, items, on_dup_key=RAISE, on_dup_val=RAISE, on_dup_kv=None):
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"""
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Like a bulk :meth:`put`.
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If one of the given items causes an exception to be raised,
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none of the items is inserted.
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"""
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if items:
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on_dup = self._get_on_dup((on_dup_key, on_dup_val, on_dup_kv))
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self._update(False, on_dup, items)
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# * Code review nav *
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#==============================================================================
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# ← Prev: _frozenbidict.py Current: _mut.py Next: _bidict.py →
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#==============================================================================
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