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import pytest
from . import mixins
class SlotShadowing(mixins.TargetedNamespaceWalker, mixins.SubclassWalker):
target_namespace = 'snakeoil'
err_if_slots_is_str = True
err_if_slots_is_mutable = True
def recurse_parents(self, kls, seen=None):
if not seen:
seen = set()
for subcls in kls.__bases__:
if subcls in seen:
continue
seen.add(subcls)
for grand_dad in self.recurse_parents(subcls, seen=seen):
yield grand_dad
yield subcls
@staticmethod
def mk_name(kls):
return '%s.%s' % (kls.__module__, kls.__name__)
def _should_ignore(self, kls):
return self.mk_name(kls).split(".")[0] != self.target_namespace
def run_check(self, kls):
if getattr(kls, '__slotting_intentionally_disabled__', False):
return
slotting = {}
raw_slottings = {}
for parent in self.recurse_parents(kls):
slots = getattr(parent, '__slots__', None)
if slots is None:
continue
if isinstance(slots, str):
slots = (slots,)
elif isinstance(slots, (dict, list)):
slots = tuple(slots)
raw_slottings[slots] = parent
for slot in slots:
slotting.setdefault(slot, parent)
slots = getattr(kls, '__slots__', None)
if slots is None and not slotting:
return
if isinstance(slots, str):
if self.err_if_slots_is_str:
pytest.fail(
"cls %r; slots is %r (should be a tuple or list)" %
(kls, slots))
slots = (slots,)
if slots is None:
assert not raw_slottings
if not isinstance(slots, tuple):
if self.err_if_slots_is_mutable:
pytest.fail(
"cls %r; slots is %r- - should be a tuple" % (kls, slots))
slots = tuple(slots)
if slots is None or (slots and slots in raw_slottings):
# we do a bool on slots to ignore (); that's completely valid
# this means that the child either didn't define __slots__, or
# daftly copied the parents... thus defeating the purpose.
pytest.fail(
"cls %r; slots is %r, seemingly inherited from %r; the "
"derivative class should be __slots__ = ()" %
(kls, slots, raw_slottings[slots]))
for slot in slots:
if slot in slotting:
pytest.fail(
"cls %r; slot %r was already defined at %r" %
(kls, slot, slotting[slot]))
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