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Copy pathfix_assert_tuple.py
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61 lines (50 loc) · 2.18 KB
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from typing import List, Union
import libcst as cst
from codemodder.codemods.libcst_transformer import (
LibcstResultTransformer,
LibcstTransformerPipeline,
)
from codemodder.codemods.utils_mixin import NameResolutionMixin
from core_codemods.api import Metadata, ReviewGuidance
from core_codemods.api.core_codemod import CoreCodemod
class FixAssertTupleTransform(LibcstResultTransformer, NameResolutionMixin):
change_description = "Separate assertion on a non-empty tuple literal into multiple assert statements."
def leave_SimpleStatementLine(
self,
original_node: cst.SimpleStatementLine,
updated_node: cst.SimpleStatementLine,
) -> Union[cst.FlattenSentinel, cst.SimpleStatementLine]:
if len(original_node.body) == 1 and isinstance(
assert_node := original_node.body[0], cst.Assert
):
match assert_test := assert_node.test:
case cst.Tuple():
if not self.node_is_selected(assert_test):
return updated_node
if not assert_test.elements:
return updated_node
new_asserts = self._make_asserts(assert_node)
self._report_new_lines(original_node, len(new_asserts))
return cst.FlattenSentinel(new_asserts)
return updated_node
def _make_asserts(self, node: cst.Assert) -> List[cst.SimpleStatementLine]:
return [
cst.SimpleStatementLine(body=[cst.Assert(test=element.value, msg=node.msg)])
for element in node.test.elements
]
def _report_new_lines(
self, original_node: cst.SimpleStatementLine, newlines_count: int
):
start_line = self.node_position(original_node).start.line
for idx in range(newlines_count):
self.report_change_for_line(start_line + idx)
FixAssertTuple = CoreCodemod(
metadata=Metadata(
name="fix-assert-tuple",
summary="Fix `assert` on Non-Empty Tuple Literal",
review_guidance=ReviewGuidance.MERGE_AFTER_CURSORY_REVIEW,
references=[],
),
transformer=LibcstTransformerPipeline(FixAssertTupleTransform),
detector=None,
)