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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 parse_module
from libcst.codemod import CodemodContext, CodemodTest
from libcst.codemod.visitors import GatherImportsVisitor
from libcst.testing.utils import UnitTest
class TestGatherImportsVisitor(UnitTest):
def gather_imports(self, code: str) -> GatherImportsVisitor:
transform_instance = GatherImportsVisitor(
CodemodContext(full_module_name="a.b.foobar", full_package_name="a.b")
)
input_tree = parse_module(CodemodTest.make_fixture_data(code))
input_tree.visit(transform_instance)
return transform_instance
def test_gather_nothing(self) -> None:
code = """
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {})
self.assertEqual(len(gatherer.all_imports), 0)
def test_gather_module(self) -> None:
code = """
import a.b.c
import d
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, {"a.b.c", "d"})
self.assertEqual(gatherer.object_mapping, {})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {})
self.assertEqual(len(gatherer.all_imports), 2)
def test_gather_aliased_module(self) -> None:
code = """
import a.b.c as e
import d as f
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {})
self.assertEqual(gatherer.module_aliases, {"a.b.c": "e", "d": "f"})
self.assertEqual(gatherer.alias_mapping, {})
self.assertEqual(len(gatherer.all_imports), 2)
def test_gather_object(self) -> None:
code = """
from a.b.c import d, e, f
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {"a.b.c": {"d", "e", "f"}})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {})
self.assertEqual(len(gatherer.all_imports), 1)
def test_gather_object_disjoint(self) -> None:
code = """
from a.b.c import d, e
from a.b.c import f
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {"a.b.c": {"d", "e", "f"}})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {})
self.assertEqual(len(gatherer.all_imports), 2)
def test_gather_aliased_object(self) -> None:
code = """
from a.b.c import d as e, f as g
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {"a.b.c": [("d", "e"), ("f", "g")]})
self.assertEqual(len(gatherer.all_imports), 1)
def test_gather_aliased_object_disjoint(self) -> None:
code = """
from a.b.c import d as e
from a.b.c import f as g
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {"a.b.c": [("d", "e"), ("f", "g")]})
self.assertEqual(len(gatherer.all_imports), 2)
def test_gather_aliased_object_mixed(self) -> None:
code = """
from a.b.c import d as e, f, g
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {"a.b.c": {"f", "g"}})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {"a.b.c": [("d", "e")]})
self.assertEqual(len(gatherer.all_imports), 1)
def test_gather_relative_object(self) -> None:
code = """
from .c import d as e, f, g
from a.b.c import h, i, j
def foo() -> None:
pass
def bar() -> int:
return 5
"""
gatherer = self.gather_imports(code)
self.assertEqual(gatherer.module_imports, set())
self.assertEqual(gatherer.object_mapping, {"a.b.c": {"f", "g", "h", "i", "j"}})
self.assertEqual(gatherer.module_aliases, {})
self.assertEqual(gatherer.alias_mapping, {"a.b.c": [("d", "e")]})
self.assertEqual(len(gatherer.all_imports), 2)
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