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49 lines
1.2 KiB
49 lines
1.2 KiB
# Copyright (c) 2010-2022 openpyxl
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class IndexedList(list):
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"""
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List with optimised access by value
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Based on Alex Martelli's recipe
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http://code.activestate.com/recipes/52303-the-auxiliary-dictionary-idiom-for-sequences-with-/
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"""
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_dict = {}
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def __init__(self, iterable=None):
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self.clean = True
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self._dict = {}
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if iterable is not None:
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self.clean = False
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for idx, val in enumerate(iterable):
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self._dict[val] = idx
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list.append(self, val)
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def _rebuild_dict(self):
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self._dict = {}
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idx = 0
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for value in self:
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if value not in self._dict:
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self._dict[value] = idx
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idx += 1
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self.clean = True
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def __contains__(self, value):
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if not self.clean:
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self._rebuild_dict()
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return value in self._dict
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def index(self, value):
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if value in self:
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return self._dict[value]
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raise ValueError
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def append(self, value):
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if value not in self._dict:
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self._dict[value] = len(self)
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list.append(self, value)
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def add(self, value):
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self.append(value)
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return self._dict[value]
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