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bpo-36290: Fix keytword collision handling in AST node constructors (GH-12382) 

(cherry picked from commit c73914a562)

Co-authored-by: Rémi Lapeyre <remi.lapeyre@lenstra.fr>
This commit is contained in:
Miss Islington (bot) 2020-05-24 14:31:47 -07:00 committed by GitHub
parent 1ae0fd87a0
commit 907ee1f14a
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 68 additions and 8 deletions
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7
Lib/ast.py
View File

@ -483,6 +483,13 @@ class _ABC(type):
return type.__instancecheck__(cls, inst)
def _new(cls, *args, **kwargs):
for key in kwargs:
if key not in cls._fields:
# arbitrary keyword arguments are accepted
continue
pos = cls._fields.index(key)
if pos < len(args):
raise TypeError(f"{cls.__name__} got multiple values for argument {key!r}")
if cls in _const_types:
return Constant(*args, **kwargs)
return Constant.__new__(cls, *args, **kwargs)

9
Lib/test/test_ast.py
View File

@ -387,6 +387,15 @@ class AST_Tests(unittest.TestCase):
self.assertRaises(TypeError, ast.Num, 1, None, 2)
self.assertRaises(TypeError, ast.Num, 1, None, 2, lineno=0)
# Arbitrary keyword arguments are supported
self.assertEqual(ast.Constant(1, foo='bar').foo, 'bar')
self.assertEqual(ast.Num(1, foo='bar').foo, 'bar')
with self.assertRaisesRegex(TypeError, "Num got multiple values for argument 'n'"):
ast.Num(1, n=2)
with self.assertRaisesRegex(TypeError, "Constant got multiple values for argument 'value'"):
ast.Constant(1, value=2)
self.assertEqual(ast.Num(42).n, 42)
self.assertEqual(ast.Num(4.25).n, 4.25)
self.assertEqual(ast.Num(4.25j).n, 4.25j)

2
Misc/NEWS.d/next/Library/2019-03-17-19-01-53.bpo-36290.7VXo_K.rst Normal file
View File

@ -0,0 +1,2 @@
AST nodes are now raising :exc:`TypeError` on conflicting keyword arguments.
Patch contributed by Rémi Lapeyre.

29
Parser/asdl_c.py
View File

@ -665,8 +665,9 @@ ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
}
if (fields) {
numfields = PySequence_Size(fields);
if (numfields == -1)
if (numfields == -1) {
goto cleanup;
}
}
res = 0; /* if no error occurs, this stays 0 to the end */
@ -687,15 +688,35 @@ ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
}
res = PyObject_SetAttr(self, name, PyTuple_GET_ITEM(args, i));
Py_DECREF(name);
if (res < 0)
if (res < 0) {
goto cleanup;
}
}
if (kw) {
i = 0; /* needed by PyDict_Next */
while (PyDict_Next(kw, &i, &key, &value)) {
res = PyObject_SetAttr(self, key, value);
if (res < 0)
int contains = PySequence_Contains(fields, key);
if (contains == -1) {
res = -1;
goto cleanup;
} else if (contains == 1) {
Py_ssize_t p = PySequence_Index(fields, key);
if (p == -1) {
res = -1;
goto cleanup;
}
if (p < PyTuple_GET_SIZE(args)) {
PyErr_Format(PyExc_TypeError,
"%.400s got multiple values for argument '%U'",
Py_TYPE(self)->tp_name, key);
res = -1;
goto cleanup;
}
}
res = PyObject_SetAttr(self, key, value);
if (res < 0) {
goto cleanup;
}
}
}
cleanup:

29
Python/Python-ast.c generated
View File

@ -571,8 +571,9 @@ ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
}
if (fields) {
numfields = PySequence_Size(fields);
if (numfields == -1)
if (numfields == -1) {
goto cleanup;
}
}
res = 0; /* if no error occurs, this stays 0 to the end */
@ -593,15 +594,35 @@ ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
}
res = PyObject_SetAttr(self, name, PyTuple_GET_ITEM(args, i));
Py_DECREF(name);
if (res < 0)
if (res < 0) {
goto cleanup;
}
}
if (kw) {
i = 0; /* needed by PyDict_Next */
while (PyDict_Next(kw, &i, &key, &value)) {
res = PyObject_SetAttr(self, key, value);
if (res < 0)
int contains = PySequence_Contains(fields, key);
if (contains == -1) {
res = -1;
goto cleanup;
} else if (contains == 1) {
Py_ssize_t p = PySequence_Index(fields, key);
if (p == -1) {
res = -1;
goto cleanup;
}
if (p < PyTuple_GET_SIZE(args)) {
PyErr_Format(PyExc_TypeError,
"%.400s got multiple values for argument '%U'",
Py_TYPE(self)->tp_name, key);
res = -1;
goto cleanup;
}
}
res = PyObject_SetAttr(self, key, value);
if (res < 0) {
goto cleanup;
}
}
}
cleanup: