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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.
#
import re
from abc import ABC
from typing import Pattern
import libcst
from libcst.codemod import CodemodContext, VisitorBasedCodemodCommand
from libcst.helpers import insert_header_comments
class AddPyreDirectiveCommand(VisitorBasedCodemodCommand, ABC):
PYRE_TAG: str
def __init__(self, context: CodemodContext) -> None:
super().__init__(context)
self._regex_pattern: Pattern[str] = re.compile(
rf"^#\s+pyre-{self.PYRE_TAG}\s*$"
)
self.needs_add = True
def visit_Comment(self, node: libcst.Comment) -> None:
if self._regex_pattern.search(node.value):
self.needs_add = False
def leave_Module(
self, original_node: libcst.Module, updated_node: libcst.Module
) -> libcst.Module:
# If the tag already exists, don't modify the file.
if not self.needs_add:
return updated_node
return insert_header_comments(updated_node, [f"# pyre-{self.PYRE_TAG}"])
class AddPyreStrictCommand(AddPyreDirectiveCommand):
"""
Given a source file, we'll add the strict tag if the file doesn't already
contain it.
"""
PYRE_TAG: str = "strict"
DESCRIPTION: str = "Add the 'pyre-strict' tag to a module."
class AddPyreUnsafeCommand(AddPyreDirectiveCommand):
"""
Given a source file, we'll add the unsafe tag if the file doesn't already
contain it.
"""
PYRE_TAG: str = "unsafe"
DESCRIPTION: str = "Add the 'pyre-unsafe' tag to a module."
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