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"""Custom maps, sequences, etc."""
from __future__ import annotations
class HashedSeq(list):
"""Hashed Sequence.
Type used for hash() to make sure the hash is not generated
multiple times.
"""
__slots__ = 'hashvalue'
def __init__(self, *seq):
self[:] = seq
self.hashvalue = hash(seq)
def __hash__(self):
return self.hashvalue
def eqhash(o):
"""Call ``obj.__eqhash__``."""
try:
return o.__eqhash__()
except AttributeError:
return hash(o)
class EqualityDict(dict):
"""Dict using the eq operator for keying."""
def __getitem__(self, key):
h = eqhash(key)
if h not in self:
return self.__missing__(key)
return super().__getitem__(h)
def __setitem__(self, key, value):
return super().__setitem__(eqhash(key), value)
def __delitem__(self, key):
return super().__delitem__(eqhash(key))
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