bpo-32226: Implementation of PEP 560 (core components) (#4732)
This part of the PEP implementation adds support for __mro_entries__ and __class_getitem__ by updating __build_class__ and PyObject_GetItem.
This commit is contained in:
Ivan Levkivskyi
GitHub
parent
15a8728415
commit
2b5fd1e9ca
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@ -0,0 +1,252 @@
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import unittest
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class TestMROEntry(unittest.TestCase):
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def test_mro_entry_signature(self):
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tested = []
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class B: ...
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class C:
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def __mro_entries__(self, *args, **kwargs):
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tested.extend([args, kwargs])
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return (C,)
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c = C()
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self.assertEqual(tested, [])
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class D(B, c): ...
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self.assertEqual(tested[0], ((B, c),))
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self.assertEqual(tested[1], {})
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def test_mro_entry(self):
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tested = []
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class A: ...
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class B: ...
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class C:
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def __mro_entries__(self, bases):
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tested.append(bases)
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return (self.__class__,)
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c = C()
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self.assertEqual(tested, [])
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class D(A, c, B): ...
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self.assertEqual(tested[-1], (A, c, B))
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self.assertEqual(D.__bases__, (A, C, B))
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self.assertEqual(D.__orig_bases__, (A, c, B))
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self.assertEqual(D.__mro__, (D, A, C, B, object))
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d = D()
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class E(d): ...
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self.assertEqual(tested[-1], (d,))
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self.assertEqual(E.__bases__, (D,))
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def test_mro_entry_none(self):
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tested = []
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class A: ...
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class B: ...
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class C:
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def __mro_entries__(self, bases):
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tested.append(bases)
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return ()
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c = C()
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self.assertEqual(tested, [])
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class D(A, c, B): ...
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self.assertEqual(tested[-1], (A, c, B))
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self.assertEqual(D.__bases__, (A, B))
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self.assertEqual(D.__orig_bases__, (A, c, B))
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self.assertEqual(D.__mro__, (D, A, B, object))
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class E(c): ...
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self.assertEqual(tested[-1], (c,))
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self.assertEqual(E.__bases__, (object,))
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self.assertEqual(E.__orig_bases__, (c,))
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self.assertEqual(E.__mro__, (E, object))
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def test_mro_entry_with_builtins(self):
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tested = []
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class A: ...
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class C:
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def __mro_entries__(self, bases):
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tested.append(bases)
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return (dict,)
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c = C()
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self.assertEqual(tested, [])
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class D(A, c): ...
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self.assertEqual(tested[-1], (A, c))
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self.assertEqual(D.__bases__, (A, dict))
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self.assertEqual(D.__orig_bases__, (A, c))
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self.assertEqual(D.__mro__, (D, A, dict, object))
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def test_mro_entry_with_builtins_2(self):
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tested = []
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class C:
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def __mro_entries__(self, bases):
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tested.append(bases)
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return (C,)
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c = C()
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self.assertEqual(tested, [])
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class D(c, dict): ...
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self.assertEqual(tested[-1], (c, dict))
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self.assertEqual(D.__bases__, (C, dict))
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self.assertEqual(D.__orig_bases__, (c, dict))
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self.assertEqual(D.__mro__, (D, C, dict, object))
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def test_mro_entry_errors(self):
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class C_too_many:
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def __mro_entries__(self, bases, something, other):
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return ()
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c = C_too_many()
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with self.assertRaises(TypeError):
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class D(c): ...
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class C_too_few:
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def __mro_entries__(self):
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return ()
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d = C_too_few()
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with self.assertRaises(TypeError):
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class D(d): ...
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def test_mro_entry_errors_2(self):
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class C_not_callable:
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__mro_entries__ = "Surprise!"
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c = C_not_callable()
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with self.assertRaises(TypeError):
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class D(c): ...
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class C_not_tuple:
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def __mro_entries__(self):
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return object
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c = C_not_tuple()
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with self.assertRaises(TypeError):
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class D(c): ...
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def test_mro_entry_metaclass(self):
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meta_args = []
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class Meta(type):
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def __new__(mcls, name, bases, ns):
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meta_args.extend([mcls, name, bases, ns])
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return super().__new__(mcls, name, bases, ns)
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class A: ...
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class C:
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def __mro_entries__(self, bases):
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return (A,)
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c = C()
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class D(c, metaclass=Meta):
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x = 1
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self.assertEqual(meta_args[0], Meta)
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self.assertEqual(meta_args[1], 'D')
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self.assertEqual(meta_args[2], (A,))
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self.assertEqual(meta_args[3]['x'], 1)
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self.assertEqual(D.__bases__, (A,))
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self.assertEqual(D.__orig_bases__, (c,))
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self.assertEqual(D.__mro__, (D, A, object))
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self.assertEqual(D.__class__, Meta)
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def test_mro_entry_type_call(self):
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# Substitution should _not_ happen in direct type call
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class C:
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def __mro_entries__(self, bases):
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return ()
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c = C()
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with self.assertRaisesRegex(TypeError,
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"MRO entry resolution; "
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"use types.new_class()"):
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type('Bad', (c,), {})
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class TestClassGetitem(unittest.TestCase):
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def test_class_getitem(self):
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getitem_args = []
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class C:
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def __class_getitem__(*args, **kwargs):
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getitem_args.extend([args, kwargs])
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return None
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C[int, str]
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self.assertEqual(getitem_args[0], (C, (int, str)))
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self.assertEqual(getitem_args[1], {})
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def test_class_getitem(self):
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class C:
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def __class_getitem__(cls, item):
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return f'C[{item.__name__}]'
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self.assertEqual(C[int], 'C[int]')
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self.assertEqual(C[C], 'C[C]')
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def test_class_getitem_inheritance(self):
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class C:
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def __class_getitem__(cls, item):
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return f'{cls.__name__}[{item.__name__}]'
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class D(C): ...
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self.assertEqual(D[int], 'D[int]')
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self.assertEqual(D[D], 'D[D]')
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def test_class_getitem_inheritance_2(self):
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class C:
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def __class_getitem__(cls, item):
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return 'Should not see this'
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class D(C):
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def __class_getitem__(cls, item):
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return f'{cls.__name__}[{item.__name__}]'
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self.assertEqual(D[int], 'D[int]')
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self.assertEqual(D[D], 'D[D]')
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def test_class_getitem_patched(self):
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class C:
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def __init_subclass__(cls):
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def __class_getitem__(cls, item):
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return f'{cls.__name__}[{item.__name__}]'
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cls.__class_getitem__ = __class_getitem__
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class D(C): ...
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self.assertEqual(D[int], 'D[int]')
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self.assertEqual(D[D], 'D[D]')
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def test_class_getitem_with_builtins(self):
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class A(dict):
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called_with = None
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def __class_getitem__(cls, item):
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cls.called_with = item
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class B(A):
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pass
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self.assertIs(B.called_with, None)
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B[int]
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self.assertIs(B.called_with, int)
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def test_class_getitem_errors(self):
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class C_too_few:
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def __class_getitem__(cls):
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return None
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with self.assertRaises(TypeError):
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C_too_few[int]
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class C_too_many:
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def __class_getitem__(cls, one, two):
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return None
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with self.assertRaises(TypeError):
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C_too_many[int]
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def test_class_getitem_errors_2(self):
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class C:
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def __class_getitem__(cls, item):
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return None
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with self.assertRaises(TypeError):
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C()[int]
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class E: ...
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e = E()
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e.__class_getitem__ = lambda cls, item: 'This will not work'
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with self.assertRaises(TypeError):
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e[int]
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class C_not_callable:
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__class_getitem__ = "Surprise!"
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with self.assertRaises(TypeError):
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C_not_callable[int]
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def test_class_getitem_metaclass(self):
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class Meta(type):
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def __class_getitem__(cls, item):
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return f'{cls.__name__}[{item.__name__}]'
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self.assertEqual(Meta[int], 'Meta[int]')
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def test_class_getitem_metaclass_2(self):
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class Meta(type):
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def __getitem__(cls, item):
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return 'from metaclass'
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class C(metaclass=Meta):
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def __class_getitem__(cls, item):
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return 'from __class_getitem__'
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self.assertEqual(C[int], 'from metaclass')
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if __name__ == "__main__":
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unittest.main()
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@ -844,6 +844,68 @@ class ClassCreationTests(unittest.TestCase):
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self.assertEqual(C.y, 1)
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self.assertEqual(C.z, 2)
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def test_new_class_with_mro_entry(self):
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class A: pass
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class C:
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def __mro_entries__(self, bases):
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return (A,)
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c = C()
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D = types.new_class('D', (c,), {})
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self.assertEqual(D.__bases__, (A,))
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self.assertEqual(D.__orig_bases__, (c,))
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self.assertEqual(D.__mro__, (D, A, object))
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def test_new_class_with_mro_entry_none(self):
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class A: pass
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class B: pass
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class C:
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def __mro_entries__(self, bases):
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return ()
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c = C()
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D = types.new_class('D', (A, c, B), {})
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self.assertEqual(D.__bases__, (A, B))
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self.assertEqual(D.__orig_bases__, (A, c, B))
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self.assertEqual(D.__mro__, (D, A, B, object))
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def test_new_class_with_mro_entry_error(self):
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class A: pass
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class C:
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def __mro_entries__(self, bases):
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return A
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c = C()
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with self.assertRaises(TypeError):
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types.new_class('D', (c,), {})
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def test_new_class_with_mro_entry_multiple(self):
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class A1: pass
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class A2: pass
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class B1: pass
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class B2: pass
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class A:
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def __mro_entries__(self, bases):
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return (A1, A2)
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class B:
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def __mro_entries__(self, bases):
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return (B1, B2)
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D = types.new_class('D', (A(), B()), {})
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self.assertEqual(D.__bases__, (A1, A2, B1, B2))
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def test_new_class_with_mro_entry_multiple_2(self):
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class A1: pass
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class A2: pass
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class A3: pass
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class B1: pass
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class B2: pass
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class A:
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def __mro_entries__(self, bases):
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return (A1, A2, A3)
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class B:
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def __mro_entries__(self, bases):
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return (B1, B2)
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class C: pass
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D = types.new_class('D', (A(), C, B()), {})
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self.assertEqual(D.__bases__, (A1, A2, A3, C, B1, B2))
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# Many of the following tests are derived from test_descr.py
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def test_prepare_class(self):
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# Basic test of metaclass derivation
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@ -886,6 +948,28 @@ class ClassCreationTests(unittest.TestCase):
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class Bar(metaclass=BadMeta()):
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pass
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def test_resolve_bases(self):
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class A: pass
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class B: pass
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class C:
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def __mro_entries__(self, bases):
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if A in bases:
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return ()
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return (A,)
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c = C()
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self.assertEqual(types.resolve_bases(()), ())
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self.assertEqual(types.resolve_bases((c,)), (A,))
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self.assertEqual(types.resolve_bases((C,)), (C,))
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self.assertEqual(types.resolve_bases((A, C)), (A, C))
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self.assertEqual(types.resolve_bases((c, A)), (A,))
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self.assertEqual(types.resolve_bases((A, c)), (A,))
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x = (A,)
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y = (C,)
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z = (A, C)
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t = (A, C, B)
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for bases in [x, y, z, t]:
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self.assertIs(types.resolve_bases(bases), bases)
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def test_metaclass_derivation(self):
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# issue1294232: correct metaclass calculation
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new_calls = [] # to check the order of __new__ calls
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28
Lib/types.py
28
Lib/types.py
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@ -60,10 +60,34 @@ del sys, _f, _g, _C, _c, # Not for export
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# Provide a PEP 3115 compliant mechanism for class creation
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def new_class(name, bases=(), kwds=None, exec_body=None):
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"""Create a class object dynamically using the appropriate metaclass."""
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meta, ns, kwds = prepare_class(name, bases, kwds)
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resolved_bases = resolve_bases(bases)
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meta, ns, kwds = prepare_class(name, resolved_bases, kwds)
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if exec_body is not None:
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exec_body(ns)
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return meta(name, bases, ns, **kwds)
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if resolved_bases is not bases:
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ns['__orig_bases__'] = bases
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return meta(name, resolved_bases, ns, **kwds)
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def resolve_bases(bases):
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"""Resolve MRO entries dynamically as specified by PEP 560."""
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new_bases = list(bases)
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updated = False
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shift = 0
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for i, base in enumerate(bases):
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if isinstance(base, type):
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continue
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if not hasattr(base, "__mro_entries__"):
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continue
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new_base = base.__mro_entries__(bases)
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updated = True
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if not isinstance(new_base, tuple):
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raise TypeError("__mro_entries__ must return a tuple")
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else:
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new_bases[i+shift:i+shift+1] = new_base
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shift += len(new_base) - 1
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if not updated:
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return bases
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return tuple(new_bases)
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def prepare_class(name, bases=(), kwds=None):
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"""Call the __prepare__ method of the appropriate metaclass.
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@ -0,0 +1,2 @@
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PEP 560: Add support for __mro_entries__ and __class_getitem__. Implemented
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by Ivan Levkivskyi.
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@ -168,6 +168,21 @@ PyObject_GetItem(PyObject *o, PyObject *key)
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"be integer, not '%.200s'", key);
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}
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if (PyType_Check(o)) {
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PyObject *meth, *result, *stack[2] = {o, key};
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_Py_IDENTIFIER(__class_getitem__);
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meth = _PyObject_GetAttrId(o, &PyId___class_getitem__);
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if (meth) {
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result = _PyObject_FastCall(meth, stack, 2);
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Py_DECREF(meth);
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return result;
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}
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else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
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return NULL;
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}
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PyErr_Clear();
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}
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return type_error("'%.200s' object is not subscriptable", o);
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}
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@ -2377,6 +2377,27 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
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nbases = 1;
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}
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else {
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_Py_IDENTIFIER(__mro_entries__);
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for (i = 0; i < nbases; i++) {
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tmp = PyTuple_GET_ITEM(bases, i);
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if (PyType_Check(tmp)) {
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continue;
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}
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tmp = _PyObject_GetAttrId(tmp, &PyId___mro_entries__);
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if (tmp != NULL) {
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PyErr_SetString(PyExc_TypeError,
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"type() doesn't support MRO entry resolution; "
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"use types.new_class()");
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Py_DECREF(tmp);
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return NULL;
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}
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else if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
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PyErr_Clear();
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}
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else {
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return NULL;
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}
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}
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/* Search the bases for the proper metatype to deal with this: */
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winner = _PyType_CalculateMetaclass(metatype, bases);
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if (winner == NULL) {
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@ -37,6 +37,7 @@ _Py_IDENTIFIER(__builtins__);
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_Py_IDENTIFIER(__dict__);
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_Py_IDENTIFIER(__prepare__);
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_Py_IDENTIFIER(__round__);
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_Py_IDENTIFIER(__mro_entries__);
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_Py_IDENTIFIER(encoding);
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_Py_IDENTIFIER(errors);
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_Py_IDENTIFIER(fileno);
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@ -49,12 +50,86 @@ _Py_IDENTIFIER(stderr);
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|||
|
||||
#include "clinic/bltinmodule.c.h"
|
||||
|
||||
static PyObject*
|
||||
update_bases(PyObject *bases, PyObject *const *args, int nargs)
|
||||
{
|
||||
int i, j;
|
||||
PyObject *base, *meth, *new_base, *result, *new_bases = NULL;
|
||||
PyObject *stack[1] = {bases};
|
||||
assert(PyTuple_Check(bases));
|
||||
|
||||
for (i = 0; i < nargs; i++) {
|
||||
base = args[i];
|
||||
if (PyType_Check(base)) {
|
||||
if (new_bases) {
|
||||
/* If we already have made a replacement, then we append every normal base,
|
||||
otherwise just skip it. */
|
||||
if (PyList_Append(new_bases, base) < 0) {
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
continue;
|
||||
}
|
||||
meth = _PyObject_GetAttrId(base, &PyId___mro_entries__);
|
||||
if (!meth) {
|
||||
if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
|
||||
goto error;
|
||||
}
|
||||
PyErr_Clear();
|
||||
if (new_bases) {
|
||||
if (PyList_Append(new_bases, base) < 0) {
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
continue;
|
||||
}
|
||||
new_base = _PyObject_FastCall(meth, stack, 1);
|
||||
Py_DECREF(meth);
|
||||
if (!new_base) {
|
||||
goto error;
|
||||
}
|
||||
if (!PyTuple_Check(new_base)) {
|
||||
PyErr_SetString(PyExc_TypeError,
|
||||
"__mro_entries__ must return a tuple");
|
||||
Py_DECREF(new_base);
|
||||
goto error;
|
||||
}
|
||||
if (!new_bases) {
|
||||
/* If this is a first successful replacement, create new_bases list and
|
||||
copy previously encountered bases. */
|
||||
if (!(new_bases = PyList_New(i))) {
|
||||
goto error;
|
||||
}
|
||||
for (j = 0; j < i; j++) {
|
||||
base = args[j];
|
||||
PyList_SET_ITEM(new_bases, j, base);
|
||||
Py_INCREF(base);
|
||||
}
|
||||
}
|
||||
j = PyList_GET_SIZE(new_bases);
|
||||
if (PyList_SetSlice(new_bases, j, j, new_base) < 0) {
|
||||
goto error;
|
||||
}
|
||||
Py_DECREF(new_base);
|
||||
}
|
||||
if (!new_bases) {
|
||||
return bases;
|
||||
}
|
||||
result = PyList_AsTuple(new_bases);
|
||||
Py_DECREF(new_bases);
|
||||
return result;
|
||||
|
||||
error:
|
||||
Py_XDECREF(new_bases);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* AC: cannot convert yet, waiting for *args support */
|
||||
static PyObject *
|
||||
builtin___build_class__(PyObject *self, PyObject **args, Py_ssize_t nargs,
|
||||
PyObject *kwnames)
|
||||
{
|
||||
PyObject *func, *name, *bases, *mkw, *meta, *winner, *prep, *ns;
|
||||
PyObject *func, *name, *bases, *mkw, *meta, *winner, *prep, *ns, *orig_bases;
|
||||
PyObject *cls = NULL, *cell = NULL;
|
||||
int isclass = 0; /* initialize to prevent gcc warning */
|
||||
|
||||
|
|
@ -75,10 +150,16 @@ builtin___build_class__(PyObject *self, PyObject **args, Py_ssize_t nargs,
|
|||
"__build_class__: name is not a string");
|
||||
return NULL;
|
||||
}
|
||||
bases = _PyStack_AsTupleSlice(args, nargs, 2, nargs);
|
||||
if (bases == NULL)
|
||||
orig_bases = _PyStack_AsTupleSlice(args, nargs, 2, nargs);
|
||||
if (orig_bases == NULL)
|
||||
return NULL;
|
||||
|
||||
bases = update_bases(orig_bases, args + 2, nargs - 2);
|
||||
if (bases == NULL) {
|
||||
Py_DECREF(orig_bases);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (kwnames == NULL) {
|
||||
meta = NULL;
|
||||
mkw = NULL;
|
||||
|
|
@ -171,6 +252,11 @@ builtin___build_class__(PyObject *self, PyObject **args, Py_ssize_t nargs,
|
|||
NULL, 0, NULL, 0, NULL, 0, NULL,
|
||||
PyFunction_GET_CLOSURE(func));
|
||||
if (cell != NULL) {
|
||||
if (bases != orig_bases) {
|
||||
if (PyMapping_SetItemString(ns, "__orig_bases__", orig_bases) < 0) {
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
PyObject *margs[3] = {name, bases, ns};
|
||||
cls = _PyObject_FastCallDict(meta, margs, 3, mkw);
|
||||
if (cls != NULL && PyType_Check(cls) && PyCell_Check(cell)) {
|
||||
|
|
@ -209,6 +295,9 @@ error:
|
|||
Py_DECREF(meta);
|
||||
Py_XDECREF(mkw);
|
||||
Py_DECREF(bases);
|
||||
if (bases != orig_bases) {
|
||||
Py_DECREF(orig_bases);
|
||||
}
|
||||
return cls;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue