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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/master/LICENSE
import sys
import astroid
from astroid import MANAGER, context, inference_tip, nodes
PY36 = sys.version_info >= (3, 6)
PY37 = sys.version_info[:2] >= (3, 7)
PY39 = sys.version_info[:2] >= (3, 9)
if PY36:
# Since Python 3.6 there is the RegexFlag enum
# where every entry will be exposed via updating globals()
def _re_transform():
return astroid.parse(
"""
import sre_compile
ASCII = sre_compile.SRE_FLAG_ASCII
IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE
LOCALE = sre_compile.SRE_FLAG_LOCALE
UNICODE = sre_compile.SRE_FLAG_UNICODE
MULTILINE = sre_compile.SRE_FLAG_MULTILINE
DOTALL = sre_compile.SRE_FLAG_DOTALL
VERBOSE = sre_compile.SRE_FLAG_VERBOSE
A = ASCII
I = IGNORECASE
L = LOCALE
U = UNICODE
M = MULTILINE
S = DOTALL
X = VERBOSE
TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE
T = TEMPLATE
DEBUG = sre_compile.SRE_FLAG_DEBUG
"""
)
astroid.register_module_extender(astroid.MANAGER, "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):
"""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:
func_to_add = astroid.extract_node(CLASS_GETITEM_TEMPLATE)
class_def.locals["__class_getitem__"] = [func_to_add]
return iter([class_def])
if PY37:
MANAGER.register_transform(
nodes.Call, inference_tip(infer_pattern_match), _looks_like_pattern_or_match
)
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