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python3.11
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astroid
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brain
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brain_re.py
# 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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