# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt
from __future__ import annotations
from astroid import context, inference_tip, nodes
from astroid.brain.helpers import register_module_extender
from astroid.builder import _extract_single_node, parse
from astroid.const import PY39_PLUS, PY311_PLUS
from astroid.manager import AstroidManager
def _re_transform() -> nodes.Module:
# The RegexFlag enum exposes all its entries by updating globals()
# In 3.6-3.10 all flags come from sre_compile
# On 3.11+ all flags come from re._compiler
if PY311_PLUS:
import_compiler = "import re._compiler as _compiler"
else:
import_compiler = "import sre_compile as _compiler"
return parse(
f"""
{import_compiler}
NOFLAG = 0
ASCII = _compiler.SRE_FLAG_ASCII
IGNORECASE = _compiler.SRE_FLAG_IGNORECASE
LOCALE = _compiler.SRE_FLAG_LOCALE
UNICODE = _compiler.SRE_FLAG_UNICODE
MULTILINE = _compiler.SRE_FLAG_MULTILINE
DOTALL = _compiler.SRE_FLAG_DOTALL
VERBOSE = _compiler.SRE_FLAG_VERBOSE
TEMPLATE = _compiler.SRE_FLAG_TEMPLATE
DEBUG = _compiler.SRE_FLAG_DEBUG
A = ASCII
I = IGNORECASE
L = LOCALE
U = UNICODE
M = MULTILINE
S = DOTALL
X = VERBOSE
T = TEMPLATE
"""
)
register_module_extender(AstroidManager(), "re", _re_transform)
CLASS_GETITEM_TEMPLATE = """
@classmethod
def __class_getitem__(cls, item):
return cls
"""
def _looks_like_pattern_or_match(node: nodes.Call) -> bool:
"""Check for re.Pattern or re.Match call in stdlib.
Match these patterns from stdlib/re.py
```py
Pattern = type(...)
Match = type(...)
```
"""
return (
node.root().name == "re"
and isinstance(node.func, nodes.Name)
and node.func.name == "type"
and isinstance(node.parent, nodes.Assign)
and len(node.parent.targets) == 1
and isinstance(node.parent.targets[0], nodes.AssignName)
and node.parent.targets[0].name in {"Pattern", "Match"}
)
def infer_pattern_match(node: nodes.Call, ctx: context.InferenceContext | None = None):
"""Infer re.Pattern and re.Match as classes.
For PY39+ add `__class_getitem__`.
"""
class_def = nodes.ClassDef(
name=node.parent.targets[0].name,
lineno=node.lineno,
col_offset=node.col_offset,
parent=node.parent,
)
if PY39_PLUS:
func_to_add = _extract_single_node(CLASS_GETITEM_TEMPLATE)
class_def.locals["__class_getitem__"] = [func_to_add]
return iter([class_def])
AstroidManager().register_transform(
nodes.Call, inference_tip(infer_pattern_match), _looks_like_pattern_or_match
)
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