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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from textwrap import dedent
import libcst as cst
from libcst.metadata import MetadataWrapper, ParentNodeProvider
from libcst.testing.utils import data_provider, UnitTest
class DependentVisitor(cst.CSTVisitor):
METADATA_DEPENDENCIES = (ParentNodeProvider,)
def __init__(self, *, test: UnitTest) -> None:
self.test = test
def on_visit(self, node: cst.CSTNode) -> bool:
for child in node.children:
parent = self.get_metadata(ParentNodeProvider, child)
self.test.assertEqual(parent, node)
return True
class ParentNodeProviderTest(UnitTest):
@data_provider(
(
(
"""
foo = 'toplevel'
fn1(foo)
fn2(foo)
def fn_def():
foo = 'shadow'
fn3(foo)
""",
),
(
"""
global_var = None
@cls_attr
class Cls(cls_attr, kwarg=cls_attr):
cls_attr = 5
def f():
pass
""",
),
(
"""
iterator = None
condition = None
[elt for target in iterator if condition]
{elt for target in iterator if condition}
{elt: target for target in iterator if condition}
(elt for target in iterator if condition)
""",
),
)
)
def test_parent_node_provier(self, code: str) -> None:
wrapper = MetadataWrapper(cst.parse_module(dedent(code)))
wrapper.visit(DependentVisitor(test=self))
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