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88 lines
3.2 KiB
88 lines
3.2 KiB
4 years ago
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# -*- 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# viewing an outdated version of the code.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: _frozenordered.py Current: _orderedbidict.py <FIN>
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#==============================================================================
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"""Provides :class:`OrderedBidict`."""
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from ._mut import MutableBidict
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from ._orderedbase import OrderedBidictBase
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class OrderedBidict(OrderedBidictBase, MutableBidict):
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"""Mutable bidict type that maintains items in insertion order."""
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__slots__ = ()
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__hash__ = None # since this class is mutable; explicit > implicit.
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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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self._sntl.nxt = self._sntl.prv = self._sntl
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def popitem(self, last=True): # pylint: disable=arguments-differ
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u"""*x.popitem() → (k, v)*
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Remove and return the most recently added item as a (key, value) pair
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if *last* is True, else the least recently added item.
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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 = next((reversed if last else iter)(self))
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val = self._pop(key)
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return key, val
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def move_to_end(self, key, last=True):
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"""Move an existing key to the beginning or end of this ordered bidict.
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The item is moved to the end if *last* is True, else to the beginning.
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:raises KeyError: if the key does not exist
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"""
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node = self._fwdm[key]
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node.prv.nxt = node.nxt
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node.nxt.prv = node.prv
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sntl = self._sntl
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if last:
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last = sntl.prv
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node.prv = last
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node.nxt = sntl
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sntl.prv = last.nxt = node
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else:
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first = sntl.nxt
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node.prv = sntl
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node.nxt = first
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sntl.nxt = first.prv = node
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# * Code review nav *
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#==============================================================================
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# ← Prev: _frozenordered.py Current: _orderedbidict.py <FIN>
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#==============================================================================
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