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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 typing import Optional
import libcst as cst
from libcst.metadata.base_provider import BatchableMetadataProvider
class ParentNodeVisitor(cst.CSTVisitor):
def __init__(self, provider: "ParentNodeProvider") -> None:
self.provider: ParentNodeProvider = provider
super().__init__()
def on_leave(self, original_node: cst.CSTNode) -> None:
for child in original_node.children:
self.provider.set_metadata(child, original_node)
super().on_leave(original_node)
class ParentNodeProvider(BatchableMetadataProvider[cst.CSTNode]):
def visit_Module(self, node: cst.Module) -> Optional[bool]:
node.visit(ParentNodeVisitor(self))
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