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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 __future__ import annotations
from textwrap import dedent
from typing import TYPE_CHECKING
from libcst import parse_module
from libcst.display import dump_graphviz
from libcst.testing.utils import UnitTest
if TYPE_CHECKING:
from libcst import Module
class CSTDumpGraphvizTest(UnitTest):
"""Check dump_graphviz contains CST nodes."""
source_code: str = dedent(
r"""
def foo(a: str) -> None:
pass ;
pass
return
"""[
1:
]
)
cst: Module
@classmethod
def setUpClass(cls) -> None:
cls.cst = parse_module(cls.source_code)
def _assert_node(self, node_name: str, graphviz_str: str) -> None:
self.assertIn(
node_name, graphviz_str, f"No node {node_name} found in graphviz_dump"
)
def _check_essential_nodes_in_tree(self, graphviz_str: str) -> None:
# Check CST nodes are present in graphviz string
self._assert_node("Module", graphviz_str)
self._assert_node("FunctionDef", graphviz_str)
self._assert_node("Name", graphviz_str)
self._assert_node("Parameters", graphviz_str)
self._assert_node("Param", graphviz_str)
self._assert_node("Annotation", graphviz_str)
self._assert_node("IndentedBlock", graphviz_str)
self._assert_node("SimpleStatementLine", graphviz_str)
self._assert_node("Pass", graphviz_str)
self._assert_node("Return", graphviz_str)
# Check CST values are present in graphviz string
self._assert_node("<foo>", graphviz_str)
self._assert_node("<a>", graphviz_str)
self._assert_node("<str>", graphviz_str)
self._assert_node("<None>", graphviz_str)
def test_essential_tree(self) -> None:
"""Check essential nodes are present in the CST graphviz dump."""
graphviz_str = dump_graphviz(self.cst)
self._check_essential_nodes_in_tree(graphviz_str)
def test_full_tree(self) -> None:
"""Check all nodes are present in the CST graphviz dump."""
graphviz_str = dump_graphviz(
self.cst,
show_whitespace=True,
show_defaults=True,
show_syntax=True,
)
self._check_essential_nodes_in_tree(graphviz_str)
self._assert_node("Semicolon", graphviz_str)
self._assert_node("SimpleWhitespace", graphviz_str)
self._assert_node("Newline", graphviz_str)
self._assert_node("TrailingWhitespace", graphviz_str)
self._assert_node("<>", graphviz_str)
self._assert_node("< >", graphviz_str)
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