def test_subclass_specialization(self):
os = OverloadSelector()
self.assertTrue(issubclass(types.Sequence, types.Container))
os.append(1, (types.Container, types.Container,))
lstty = types.List(types.boolean)
self.assertEqual(os.find((lstty, lstty)), 1)
os.append(2, (types.Container, types.Sequence,))
self.assertEqual(os.find((lstty, lstty)), 2)
def test_cache(self):
os = OverloadSelector()
self.assertEqual(len(os._cache), 0)
os.append(1, (types.Any,))
self.assertEqual(os.find((types.int32,)), 1)
self.assertEqual(len(os._cache), 1)
os.append(2, (types.Integer,))
self.assertEqual(len(os._cache), 0)
self.assertEqual(os.find((types.int32,)), 2)
self.assertEqual(len(os._cache), 1)
def test_match(self):
os = OverloadSelector()
self.assertTrue(os._match(formal=types.Boolean, actual=types.boolean))
self.assertTrue(os._match(formal=types.Boolean, actual=types.Boolean))
# test subclass
self.assertTrue(issubclass(types.Sequence, types.Container))
self.assertTrue(os._match(formal=types.Container,
actual=types.Sequence))
self.assertFalse(os._match(formal=types.Sequence,
actual=types.Container))
# test any
self.assertTrue(os._match(formal=types.Any, actual=types.Any))
self.assertTrue(os._match(formal=types.Any, actual=types.Container))
self.assertFalse(os._match(formal=types.Container, actual=types.Any))
def test_select_and_sort_1(self):
os = OverloadSelector()
os.append(1, (types.Any, types.Boolean))
os.append(2, (types.Boolean, types.Integer))
os.append(3, (types.Boolean, types.Any))
os.append(4, (types.Boolean, types.Boolean))
compats = os._select_compatible((types.boolean, types.boolean))
self.assertEqual(len(compats), 3)
ordered, scoring = os._sort_signatures(compats)
self.assertEqual(len(ordered), 3)
self.assertEqual(len(scoring), 3)
self.assertEqual(ordered[0], (types.Boolean, types.Boolean))
self.assertEqual(scoring[types.Boolean, types.Boolean], 0)
self.assertEqual(scoring[types.Boolean, types.Any], 1)
self.assertEqual(scoring[types.Any, types.Boolean], 1)
def test_select_and_sort_2(self):
os = OverloadSelector()
os.append(1, (types.Container,))
os.append(2, (types.Sequence,))
os.append(3, (types.MutableSequence,))
os.append(4, (types.List,))
compats = os._select_compatible((types.List,))
self.assertEqual(len(compats), 4)
ordered, scoring = os._sort_signatures(compats)
self.assertEqual(len(ordered), 4)
self.assertEqual(len(scoring), 4)
self.assertEqual(ordered[0], (types.List,))
self.assertEqual(scoring[(types.List,)], 0)
self.assertEqual(scoring[(types.MutableSequence,)], 1)
self.assertEqual(scoring[(types.Sequence,)], 2)
self.assertEqual(scoring[(types.Container,)], 3)
def test_ambiguous_detection(self):
os = OverloadSelector()
# unambiguous signatures
os.append(1, (types.Any, types.Boolean))
os.append(2, (types.Integer, types.Boolean))
self.assertEqual(os.find((types.boolean, types.boolean)), 1)
# not implemented
with self.assertRaises(NotImplementedError) as raises:
os.find((types.boolean, types.int32))
# generic
os.append(3, (types.Any, types.Any))
self.assertEqual(os.find((types.boolean, types.int32)), 3)
self.assertEqual(os.find((types.boolean, types.boolean)), 1)
# add ambiguous signature; can match (bool, any) and (any, bool)
os.append(4, (types.Boolean, types.Any))
with self.assertRaises(TypeError) as raises:
os.find((types.boolean, types.boolean))
self.assertIn('2 ambiguous signatures', str(raises.exception))
# disambiguous
os.append(5, (types.boolean, types.boolean))
self.assertEqual(os.find((types.boolean, types.boolean)), 5)
def create_overload_selector(self, kind):
os = OverloadSelector()
loader = RegistryLoader(builtin_registry)
for impl, sig in loader.new_registrations(kind):
os.append(impl, sig)
return os