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class HashKey:
_crasher = None
def __init__(self, hash, name, *, error_on_eq_to=None):
assert hash != -1
self.name = name
self.hash = hash
self.error_on_eq_to = error_on_eq_to
def __repr__(self):
if self._crasher is not None and self._crasher.error_on_repr:
raise ReprError
return '<Key name:{} hash:{}>'.format(self.name, self.hash)
def __hash__(self):
if self._crasher is not None and self._crasher.error_on_hash:
raise HashingError
return self.hash
def __eq__(self, other):
if not isinstance(other, HashKey):
return NotImplemented
if self._crasher is not None and self._crasher.error_on_eq:
raise EqError
if self.error_on_eq_to is not None and self.error_on_eq_to is other:
raise ValueError('cannot compare {!r} to {!r}'.format(self, other))
if other.error_on_eq_to is not None and other.error_on_eq_to is self:
raise ValueError('cannot compare {!r} to {!r}'.format(other, self))
return (self.name, self.hash) == (other.name, other.hash)
class KeyStr(str):
def __hash__(self):
if HashKey._crasher is not None and HashKey._crasher.error_on_hash:
raise HashingError
return super().__hash__()
def __eq__(self, other):
if HashKey._crasher is not None and HashKey._crasher.error_on_eq:
raise EqError
return super().__eq__(other)
def __repr__(self, other):
if HashKey._crasher is not None and HashKey._crasher.error_on_repr:
raise ReprError
return super().__eq__(other)
class HashKeyCrasher:
def __init__(self, *, error_on_hash=False, error_on_eq=False,
error_on_repr=False):
self.error_on_hash = error_on_hash
self.error_on_eq = error_on_eq
self.error_on_repr = error_on_repr
def __enter__(self):
if HashKey._crasher is not None:
raise RuntimeError('cannot nest crashers')
HashKey._crasher = self
def __exit__(self, *exc):
HashKey._crasher = None
class HashingError(Exception):
pass
class EqError(Exception):
pass
class ReprError(Exception):
pass
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