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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
from typing import Set
import libcst as cst
from libcst.testing.utils import data_provider, UnitTest
class DeepCloneTest(UnitTest):
@data_provider(
(
# Simple program
(
"""
foo = 'toplevel'
fn1(foo)
fn2(foo)
def fn_def():
foo = 'shadow'
fn3(foo)
""",
),
)
)
def test_deep_clone(self, code: str) -> None:
test_case = self
class NodeGatherVisitor(cst.CSTVisitor):
def __init__(self) -> None:
self.nodes: Set[int] = set()
def on_visit(self, node: cst.CSTNode) -> bool:
self.nodes.add(id(node))
return True
class NodeVerifyVisitor(cst.CSTVisitor):
def __init__(self, nodes: Set[int]) -> None:
self.nodes = nodes
def on_visit(self, node: cst.CSTNode) -> bool:
test_case.assertFalse(
id(node) in self.nodes, f"Node {node} was not cloned properly!"
)
return True
module = cst.parse_module(dedent(code))
gatherer = NodeGatherVisitor()
module.visit(gatherer)
new_module = module.deep_clone()
self.assertTrue(module.deep_equals(new_module))
new_module.visit(NodeVerifyVisitor(gatherer.nodes))
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