/usr/lib/python2.7/dist-packages/pygccxml/declarations/type_traits.py is in python-pygccxml 1.8.0-1.
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# Copyright 2004-2008 Roman Yakovenko.
# Distributed under the Boost Software License, Version 1.0.
# See http://www.boost.org/LICENSE_1_0.txt
"""
defines few algorithms, that deals with different C++ type properties
Are you aware of `boost::type_traits <http://www.boost.org/doc/libs/1_37_0/
libs/type_traits/doc/html/boost_typetraits/intro.html>`_
library? pygccxml implements the same functionality.
This module contains a set of very specific traits functions\\classes, each of
which encapsulate a single trait from the C++ type system. For example:
* is a type a pointer or a reference type ?
* does a type have a trivial constructor ?
* does a type have a const-qualifier ?
"""
from . import cpptypes
from . import typedef
from . import namespace
from .. import utils
def __remove_alias(type_):
"""implementation details"""
if isinstance(type_, typedef.typedef_t):
return __remove_alias(type_.decl_type)
if isinstance(type_, cpptypes.declarated_t) and \
isinstance(type_.declaration, typedef.typedef_t):
return __remove_alias(type_.declaration.decl_type)
if isinstance(type_, cpptypes.compound_t):
type_.base = __remove_alias(type_.base)
return type_
return type_
def remove_alias(type_):
"""returns type without typedefs"""
type_ref = None
if isinstance(type_, cpptypes.type_t):
type_ref = type_
elif isinstance(type_, typedef.typedef_t):
type_ref = type_.decl_type
else:
pass # not a valid input, just return it
if not type_ref:
return type_
if type_ref.cache.remove_alias:
return type_ref.cache.remove_alias
no_alias = __remove_alias(type_ref.clone())
type_ref.cache.remove_alias = no_alias
return no_alias
def decompose_type(tp):
"""implementation details"""
# implementation of this function is important
if isinstance(tp, cpptypes.compound_t):
return [tp] + decompose_type(tp.base)
elif isinstance(tp, typedef.typedef_t):
return decompose_type(tp.decl_type)
elif isinstance(tp, cpptypes.declarated_t) and \
isinstance(tp.declaration, typedef.typedef_t):
return decompose_type(tp.declaration.decl_type)
else:
return [tp]
def decompose_class(type_):
"""implementation details"""
types = decompose_type(type_)
return [tp.__class__ for tp in types]
def base_type(type_):
"""returns base type.
For `const int` will return `int`
"""
types = decompose_type(type_)
return types[-1]
def _create_cv_types(base):
"""
Implementation detail.
"""
return (
[base,
cpptypes.const_t(base),
cpptypes.volatile_t(base),
cpptypes.volatile_t(cpptypes.const_t(base))]
)
# Some tuples containing combinations of different types
# These are created once the module is loaded, so that when they are used
# they do not need to be re-created.
_void_def = _create_cv_types(cpptypes.void_t())
_bool_def = _create_cv_types(cpptypes.bool_t())
_float_def = (
_create_cv_types(cpptypes.float_t()) +
_create_cv_types(cpptypes.double_t()) +
_create_cv_types(cpptypes.long_double_t()))
_integral_def = (
_create_cv_types(cpptypes.char_t()) +
_create_cv_types(cpptypes.unsigned_char_t()) +
_create_cv_types(cpptypes.signed_char_t()) +
_create_cv_types(cpptypes.wchar_t()) +
_create_cv_types(cpptypes.short_int_t()) +
_create_cv_types(cpptypes.short_unsigned_int_t()) +
_create_cv_types(cpptypes.bool_t()) +
_create_cv_types(cpptypes.int_t()) +
_create_cv_types(cpptypes.unsigned_int_t()) +
_create_cv_types(cpptypes.long_int_t()) +
_create_cv_types(cpptypes.long_unsigned_int_t()) +
_create_cv_types(cpptypes.long_long_int_t()) +
_create_cv_types(cpptypes.long_long_unsigned_int_t()) +
_create_cv_types(cpptypes.int128_t()) +
_create_cv_types(cpptypes.uint128_t()))
def does_match_definition(given, main, secondary):
"""implementation details"""
assert isinstance(secondary, tuple)
assert 2 == len(secondary) # general solution could be provided
types = decompose_type(given)
if isinstance(types[0], main):
return True
elif 2 <= len(types) and \
((isinstance(types[0], main) and isinstance(types[1], secondary)) or
(isinstance(types[1], main) and isinstance(types[0], secondary))):
return True
elif 3 <= len(types):
classes = set([tp.__class__ for tp in types[:3]])
desired = set([main] + list(secondary))
diff = classes.symmetric_difference(desired)
if not diff:
return True
if len(diff) == 2:
items = list(diff)
return (
issubclass(
items[0], items[1]) or issubclass(items[1], items[0]))
else:
return False
else:
return False
def is_bool(type_):
"""
Check if type is of boolean type.
Args:
type_ (type_t): The type to be checked
Returns:
bool: True if type is a boolean, False otherwise.
"""
return remove_alias(type_) in _bool_def
def is_void(type_):
"""
Check if type is of void type.
Args:
type_ (type_t): The type to be checked
Returns:
bool: True if type is void, False otherwise.
"""
return remove_alias(type_) in _void_def
def is_void_pointer(type_):
"""returns True, if type represents `void*`, False otherwise"""
return is_same(type_, cpptypes.pointer_t(cpptypes.void_t()))
def is_integral(type_):
"""
Check if type is a C++ integral type
Args:
type_ (type_t): The type to be checked
Returns:
bool: True if type is a C++ integral type, False otherwise.
"""
return remove_alias(type_) in _integral_def
def is_floating_point(type_):
"""returns True, if type represents C++ floating point type,
False otherwise"""
return remove_alias(type_) in _float_def
def is_arithmetic(type_):
"""returns True, if type represents C++ integral or floating point type,
False otherwise"""
return is_integral(type_) or is_floating_point(type_)
def is_pointer(type_):
"""returns True, if type represents C++ pointer type, False otherwise"""
return does_match_definition(type_,
cpptypes.pointer_t,
(cpptypes.const_t, cpptypes.volatile_t)) \
or does_match_definition(type_,
cpptypes.pointer_t,
(cpptypes.volatile_t, cpptypes.const_t))
def is_calldef_pointer(type_):
"""returns True, if type represents pointer to free/member function,
False otherwise"""
if not is_pointer(type_):
return False
nake_type = remove_alias(type_)
nake_type = remove_cv(nake_type)
return isinstance(nake_type, cpptypes.compound_t) \
and isinstance(nake_type.base, cpptypes.calldef_type_t)
def remove_pointer(type_):
"""removes pointer from the type definition
If type is not pointer type, it will be returned as is.
"""
nake_type = remove_alias(type_)
if not is_pointer(nake_type):
return type_
elif isinstance(nake_type, cpptypes.volatile_t) and \
isinstance(nake_type.base, cpptypes.pointer_t):
return cpptypes.volatile_t(nake_type.base.base)
elif isinstance(nake_type, cpptypes.const_t) and \
isinstance(nake_type.base, cpptypes.pointer_t):
return cpptypes.const_t(nake_type.base.base)
elif isinstance(nake_type, cpptypes.volatile_t) \
and isinstance(nake_type.base, cpptypes.const_t) \
and isinstance(nake_type.base.base, cpptypes.pointer_t):
return (
cpptypes.volatile_t(cpptypes.const_t(nake_type.base.base.base))
)
else:
return nake_type.base
def is_reference(type_):
"""returns True, if type represents C++ reference type, False otherwise"""
nake_type = remove_alias(type_)
return isinstance(nake_type, cpptypes.reference_t)
def is_array(type_):
"""returns True, if type represents C++ array type, False otherwise"""
nake_type = remove_alias(type_)
nake_type = remove_reference(nake_type)
nake_type = remove_cv(nake_type)
return isinstance(nake_type, cpptypes.array_t)
def array_size(type_):
"""returns array size"""
nake_type = remove_alias(type_)
nake_type = remove_reference(nake_type)
nake_type = remove_cv(nake_type)
assert isinstance(nake_type, cpptypes.array_t)
return nake_type.size
def array_item_type(type_):
"""returns array item type"""
if is_array(type_):
type_ = remove_alias(type_)
type_ = remove_cv(type_)
return type_.base
elif is_pointer(type_):
return remove_pointer(type_)
else:
raise RuntimeError(
"array_item_type functions takes as argument array or pointer " +
"types")
def remove_reference(type_):
"""removes reference from the type definition
If type is not reference type, it will be returned as is.
"""
nake_type = remove_alias(type_)
if not is_reference(nake_type):
return type_
else:
return nake_type.base
def is_const(type_):
"""returns True, if type represents C++ const type, False otherwise"""
nake_type = remove_alias(type_)
if isinstance(nake_type, cpptypes.const_t):
return True
elif isinstance(nake_type, cpptypes.volatile_t):
return is_const(nake_type.base)
elif isinstance(nake_type, cpptypes.array_t):
return is_const(nake_type.base)
return False
def remove_const(type_):
"""removes const from the type definition
If type is not const type, it will be returned as is
"""
nake_type = remove_alias(type_)
if not is_const(nake_type):
return type_
else:
# Handling for const and volatile qualified types. There is a
# difference in behavior between GCCXML and CastXML for cv-qual arrays.
# GCCXML produces the following nesting of types:
# -> volatile_t(const_t(array_t))
# while CastXML produces the following nesting:
# -> array_t(volatile_t(const_t))
# For both cases, we must unwrap the types, remove const_t, and add
# back the outer layers
if isinstance(nake_type, cpptypes.array_t):
is_v = is_volatile(nake_type)
if is_v:
result_type = nake_type.base.base.base
else:
result_type = nake_type.base.base
if is_v:
result_type = cpptypes.volatile_t(result_type)
return cpptypes.array_t(result_type, nake_type.size)
elif isinstance(nake_type, cpptypes.volatile_t):
return cpptypes.volatile_t(nake_type.base.base)
return nake_type.base
def remove_declarated(type_):
"""removes type-declaration class-binder :class:`declarated_t` from
the `type_`
If `type_` is not :class:`declarated_t`, it will be returned as is
"""
type_ = remove_alias(type_)
if isinstance(type_, cpptypes.declarated_t):
type_ = type_.declaration
return type_
def is_same(type1, type2):
"""returns True, if type1 and type2 are same types"""
nake_type1 = remove_declarated(type1)
nake_type2 = remove_declarated(type2)
return nake_type1 == nake_type2
def is_volatile(type_):
"""returns True, if type represents C++ volatile type, False otherwise"""
nake_type = remove_alias(type_)
if isinstance(nake_type, cpptypes.volatile_t):
return True
elif isinstance(nake_type, cpptypes.const_t):
return is_volatile(nake_type.base)
elif isinstance(nake_type, cpptypes.array_t):
return is_volatile(nake_type.base)
return False
def remove_volatile(type_):
"""removes volatile from the type definition
If type is not volatile type, it will be returned as is
"""
nake_type = remove_alias(type_)
if not is_volatile(nake_type):
return type_
else:
if isinstance(nake_type, cpptypes.array_t):
is_c = is_const(nake_type)
if is_c:
base_type = nake_type.base.base.base
else:
base_type = nake_type.base.base
result_type = base_type
if is_c:
result_type = cpptypes.const_t(result_type)
return cpptypes.array_t(result_type, nake_type.size)
return nake_type.base
def remove_cv(type_):
"""removes const and volatile from the type definition"""
nake_type = remove_alias(type_)
if not is_const(nake_type) and not is_volatile(nake_type):
return type_
result = nake_type
if is_const(result):
result = remove_const(result)
if is_volatile(result):
result = remove_volatile(result)
if is_const(result):
result = remove_const(result)
return result
def is_fundamental(type_):
"""returns True, if type represents C++ fundamental type"""
return does_match_definition(
type_,
cpptypes.fundamental_t,
(cpptypes.const_t, cpptypes.volatile_t)) \
or does_match_definition(
type_,
cpptypes.fundamental_t,
(cpptypes.volatile_t, cpptypes.const_t))
def is_defined_in_xxx(xxx, cls):
"""
small helper function, that checks whether the class `cls` is defined
under `::xxx` namespace
"""
if not cls.parent:
return False
if not isinstance(cls.parent, namespace.namespace_t):
return False
if xxx != cls.parent.name:
return False
xxx_ns = cls.parent
if not xxx_ns.parent:
return False
if not isinstance(xxx_ns.parent, namespace.namespace_t):
return False
if '::' != xxx_ns.parent.name:
return False
global_ns = xxx_ns.parent
return None is global_ns.parent
string_equivalences = [
('::std::basic_string<char,std::char_traits<char>,' +
'std::allocator<char> >'),
('::std::basic_string<char, std::char_traits<char>, ' +
'std::allocator<char> >'),
'::std::basic_string<char>', '::std::string']
wstring_equivalences = [
('::std::basic_string<wchar_t,std::char_traits<wchar_t>,' +
'std::allocator<wchar_t> >'),
('::std::basic_string<wchar_t, std::char_traits<wchar_t>, ' +
'std::allocator<wchar_t> >'),
'::std::basic_string<wchar_t>', '::std::wstring']
ostream_equivalences = [
'::std::basic_ostream<char, std::char_traits<char> >',
'::std::basic_ostream<char,std::char_traits<char> >',
'::std::basic_ostream<char>', '::std::ostream']
wostream_equivalences = [
'::std::basic_ostream<wchar_t, std::char_traits<wchar_t> >',
'::std::basic_ostream<wchar_t,std::char_traits<wchar_t> >',
'::std::basic_ostream<wchar_t>', '::std::wostream']
def is_std_string(type_):
"""
Returns True, if type represents C++ `std::string`, False otherwise.
"""
if utils.is_str(type_):
return type_ in string_equivalences
else:
type_ = remove_alias(type_)
type_ = remove_reference(type_)
type_ = remove_cv(type_)
return type_.decl_string in string_equivalences
def is_std_wstring(type_):
"""
Returns True, if type represents C++ `std::wstring`, False otherwise.
"""
if utils.is_str(type_):
return type_ in wstring_equivalences
else:
type_ = remove_alias(type_)
type_ = remove_reference(type_)
type_ = remove_cv(type_)
return type_.decl_string in wstring_equivalences
def is_std_ostream(type_):
"""
Returns True, if type represents C++ std::ostream, False otherwise.
"""
if utils.is_str(type_):
return type_ in ostream_equivalences
else:
type_ = remove_alias(type_)
type_ = remove_reference(type_)
type_ = remove_cv(type_)
return type_.decl_string in ostream_equivalences
def is_std_wostream(type_):
"""
Returns True, if type represents C++ std::wostream, False otherwise.
"""
if utils.is_str(type_):
return type_ in wostream_equivalences
else:
type_ = remove_alias(type_)
type_ = remove_reference(type_)
type_ = remove_cv(type_)
return type_.decl_string in wostream_equivalences
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