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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 import parse_module
from libcst.codemod import CodemodContext, ContextAwareTransformer, ContextAwareVisitor
from libcst.metadata import PositionProvider
from libcst.testing.utils import UnitTest
class TestingCollector(ContextAwareVisitor):
METADATA_DEPENDENCIES = (PositionProvider,)
def visit_Pass(self, node: cst.Pass) -> None:
position = self.get_metadata(PositionProvider, node)
self.context.scratch["pass"] = (position.start.line, position.start.column)
class TestingTransform(ContextAwareTransformer):
METADATA_DEPENDENCIES = (PositionProvider,)
def visit_FunctionDef(self, node: cst.FunctionDef) -> None:
position = self.get_metadata(PositionProvider, node)
self.context.scratch[node.name.value] = (
position.start.line,
position.start.column,
)
node.visit(TestingCollector(self.context))
class TestMetadata(UnitTest):
def test_metadata_works(self) -> None:
code = """
def foo() -> None:
pass
def bar() -> int:
return 5
"""
module = parse_module(dedent(code))
context = CodemodContext()
transform = TestingTransform(context)
transform.transform_module(module)
self.assertEqual(
context.scratch, {"foo": (2, 0), "pass": (3, 4), "bar": (5, 0)}
)
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