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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 typing import cast
from unittest.mock import Mock
import libcst as cst
from libcst import BatchableCSTVisitor, parse_module, visit_batched
from libcst.testing.utils import UnitTest
class BatchedVisitorTest(UnitTest):
def test_simple(self) -> None:
mock = Mock()
class ABatchable(BatchableCSTVisitor):
def visit_Del(self, node: cst.Del) -> None:
object.__setattr__(node, "target", mock.visited_a())
class BBatchable(BatchableCSTVisitor):
def visit_Del(self, node: cst.Del) -> None:
object.__setattr__(node, "semicolon", mock.visited_b())
module = visit_batched(parse_module("del a"), [ABatchable(), BBatchable()])
del_ = cast(cst.SimpleStatementLine, module.body[0]).body[0]
# Check that each visitor was only called once
mock.visited_a.assert_called_once()
mock.visited_b.assert_called_once()
# Check properties were set
self.assertEqual(object.__getattribute__(del_, "target"), mock.visited_a())
self.assertEqual(object.__getattribute__(del_, "semicolon"), mock.visited_b())
def test_all_visits(self) -> None:
mock = Mock()
class Batchable(BatchableCSTVisitor):
def visit_If(self, node: cst.If) -> None:
object.__setattr__(node, "test", mock.visit_If())
def visit_If_body(self, node: cst.If) -> None:
object.__setattr__(node, "leading_lines", mock.visit_If_body())
def leave_If_body(self, node: cst.If) -> None:
object.__setattr__(node, "orelse", mock.leave_If_body())
def leave_If(self, original_node: cst.If) -> None:
object.__setattr__(
original_node, "whitespace_before_test", mock.leave_If()
)
module = visit_batched(parse_module("if True: pass"), [Batchable()])
if_ = cast(cst.SimpleStatementLine, module.body[0])
# Check that each visitor was only called once
mock.visit_If.assert_called_once()
mock.leave_If.assert_called_once()
mock.visit_If_body.assert_called_once()
mock.leave_If_body.assert_called_once()
# Check properties were set
self.assertEqual(object.__getattribute__(if_, "test"), mock.visit_If())
self.assertEqual(
object.__getattribute__(if_, "leading_lines"), mock.visit_If_body()
)
self.assertEqual(object.__getattribute__(if_, "orelse"), mock.leave_If_body())
self.assertEqual(
object.__getattribute__(if_, "whitespace_before_test"), mock.leave_If()
)
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