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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 libcst import MetadataWrapper, parse_module
from libcst.codemod import CodemodContext, CodemodTest
from libcst.codemod.visitors import GatherNamesFromStringAnnotationsVisitor
from libcst.testing.utils import UnitTest
class TestGatherNamesFromStringAnnotationsVisitor(UnitTest):
def gather_names(self, code: str) -> GatherNamesFromStringAnnotationsVisitor:
mod = MetadataWrapper(parse_module(CodemodTest.make_fixture_data(code)))
mod.resolve_many(GatherNamesFromStringAnnotationsVisitor.METADATA_DEPENDENCIES)
instance = GatherNamesFromStringAnnotationsVisitor(CodemodContext(wrapper=mod))
mod.visit(instance)
return instance
def test_no_annotations(self) -> None:
visitor = self.gather_names(
"""
def foo() -> None:
pass
"""
)
self.assertEqual(visitor.names, set())
def test_simple_string_annotations(self) -> None:
visitor = self.gather_names(
"""
def foo() -> "None":
pass
"""
)
self.assertEqual(visitor.names, {"None"})
def test_concatenated_string_annotations(self) -> None:
visitor = self.gather_names(
"""
def foo() -> "No" "ne":
pass
"""
)
self.assertEqual(visitor.names, {"None"})
def test_typevars(self) -> None:
visitor = self.gather_names(
"""
from typing import TypeVar as SneakyBastard
V = SneakyBastard("V", bound="int")
"""
)
self.assertEqual(visitor.names, {"V", "int"})
def test_complex(self) -> None:
visitor = self.gather_names(
"""
from typing import TypeVar, TYPE_CHECKING
if TYPE_CHECKING:
from a import Container, Item
def foo(a: "A") -> "Item":
pass
A = TypeVar("A", bound="Container[Item]")
class X:
var: "ThisIsExpensiveToImport" # noqa
"""
)
self.assertEqual(
visitor.names, {"A", "Item", "Container", "ThisIsExpensiveToImport"}
)
def test_dotted_names(self) -> None:
visitor = self.gather_names(
"""
a: "api.http_exceptions.HttpException"
"""
)
self.assertEqual(
visitor.names,
{"api", "api.http_exceptions", "api.http_exceptions.HttpException"},
)
def test_literals(self) -> None:
visitor = self.gather_names(
"""
from typing import Literal
a: Literal["in"]
b: list[Literal["1x"]]
c: Literal["Any"]
"""
)
self.assertEqual(visitor.names, set())
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