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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/main/LICENSE
# Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt
"""
Astroid hooks for ctypes module.
Inside the ctypes module, the value class is defined inside
the C coded module _ctypes.
Thus astroid doesn't know that the value member is a builtin type
among float, int, bytes or str.
"""
import sys
from astroid.brain.helpers import register_module_extender
from astroid.builder import parse
from astroid.manager import AstroidManager
def enrich_ctypes_redefined_types():
"""
For each ctypes redefined types, overload 'value' and '_type_' members
definition.
Overloading 'value' is mandatory otherwise astroid cannot infer the correct type for it.
Overloading '_type_' is necessary because the class definition made here replaces the original
one, in which '_type_' member is defined. Luckily those original class definitions are very short
and contain only the '_type_' member definition.
"""
c_class_to_type = (
("c_byte", "int", "b"),
("c_char", "bytes", "c"),
("c_double", "float", "d"),
("c_float", "float", "f"),
("c_int", "int", "i"),
("c_int16", "int", "h"),
("c_int32", "int", "i"),
("c_int64", "int", "l"),
("c_int8", "int", "b"),
("c_long", "int", "l"),
("c_longdouble", "float", "g"),
("c_longlong", "int", "l"),
("c_short", "int", "h"),
("c_size_t", "int", "L"),
("c_ssize_t", "int", "l"),
("c_ubyte", "int", "B"),
("c_uint", "int", "I"),
("c_uint16", "int", "H"),
("c_uint32", "int", "I"),
("c_uint64", "int", "L"),
("c_uint8", "int", "B"),
("c_ulong", "int", "L"),
("c_ulonglong", "int", "L"),
("c_ushort", "int", "H"),
("c_wchar", "str", "u"),
)
src = [
"""
from _ctypes import _SimpleCData
class c_bool(_SimpleCData):
def __init__(self, value):
self.value = True
self._type_ = '?'
"""
]
for c_type, builtin_type, type_code in c_class_to_type:
src.append(
f"""
class {c_type}(_SimpleCData):
def __init__(self, value):
self.value = {builtin_type}(value)
self._type_ = '{type_code}'
"""
)
return parse("\n".join(src))
if not hasattr(sys, "pypy_version_info"):
# No need of this module in pypy where everything is written in python
register_module_extender(AstroidManager(), "ctypes", enrich_ctypes_redefined_types)