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27 lines
891 B
Python
27 lines
891 B
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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# pyre-strict
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from typing import Optional
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import libcst as cst
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from libcst.metadata.base_provider import BatchableMetadataProvider
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class ParentNodeVisitor(cst.CSTVisitor):
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def __init__(self, provider: "ParentNodeProvider") -> None:
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self.provider: ParentNodeProvider = provider
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super().__init__()
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def on_leave(self, original_node: cst.CSTNode) -> None:
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for child in original_node.children:
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self.provider.set_metadata(child, original_node)
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super().on_leave(original_node)
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class ParentNodeProvider(BatchableMetadataProvider[Optional[cst.CSTNode]]):
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def visit_Module(self, node: cst.Module) -> Optional[bool]:
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node.visit(ParentNodeVisitor(self))
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