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python/Objects/boolobject.c at master · Meemaw/python · GitHub
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/* Boolean type, a subtype of int */
#include
"Python.h"
/* We need to define bool_print to override int_print */
static
int
bool_print
(
PyBoolObject
*
self
,
FILE
*
fp
,
int
flags
)
{
Py_BEGIN_ALLOW_THREADS
fputs
(
self
->
ob_ival
==
0
? "
False
" : "
True
",
fp
);
Py_END_ALLOW_THREADS
return
0
;
}
/* We define bool_repr to return "False" or "True" */
static
PyObject
*
false_str
=
NULL
;
static
PyObject
*
true_str
=
NULL
;
static
PyObject
*
bool_repr
(
PyBoolObject
*
self
)
{
PyObject
*
s
;
if
(
self
->
ob_ival
)
s
=
true_str
?
true_str
:
(
true_str
=
PyString_InternFromString
(
"True"
));
else
s
=
false_str
?
false_str
:
(
false_str
=
PyString_InternFromString
(
"False"
));
Py_XINCREF
(
s
);
return
s
;
}
/* Function to return a bool from a C long */
PyObject
*
PyBool_FromLong
(
long
ok
)
{
PyObject
*
result
;
if
(
ok
)
result
=
Py_True
;
else
result
=
Py_False
;
Py_INCREF
(
result
);
return
result
;
}
/* We define bool_new to always return either Py_True or Py_False */
static
PyObject
*
bool_new
(
PyTypeObject
*
type
,
PyObject
*
args
,
PyObject
*
kwds
)
{
static
char
*
kwlist
[]
=
{
"x"
,
0
};
PyObject
*
x
=
Py_False
;
long
ok
;
if
(!
PyArg_ParseTupleAndKeywords
(
args
,
kwds
,
"|O:bool"
,
kwlist
,
&
x
))
return
NULL
;
ok
=
PyObject_IsTrue
(
x
);
if
(
ok
<
0
)
return
NULL
;
return
PyBool_FromLong
(
ok
);
}
/* Arithmetic operations redefined to return bool if both args are bool. */
static
PyObject
*
bool_and
(
PyObject
*
a
,
PyObject
*
b
)
{
if
(!
PyBool_Check
(
a
)
||
!
PyBool_Check
(
b
))
return
PyInt_Type
.
tp_as_number
->
nb_and
(
a
,
b
);
return
PyBool_FromLong
(
((
PyBoolObject
*
)
a
)
->
ob_ival
&
((
PyBoolObject
*
)
b
)
->
ob_ival
);
}
static
PyObject
*
bool_or
(
PyObject
*
a
,
PyObject
*
b
)
{
if
(!
PyBool_Check
(
a
)
||
!
PyBool_Check
(
b
))
return
PyInt_Type
.
tp_as_number
->
nb_or
(
a
,
b
);
return
PyBool_FromLong
(
((
PyBoolObject
*
)
a
)
->
ob_ival
| ((
PyBoolObject
*
)
b
)
->
ob_ival
);
}
static
PyObject
*
bool_xor
(
PyObject
*
a
,
PyObject
*
b
)
{
if
(!
PyBool_Check
(
a
)
||
!
PyBool_Check
(
b
))
return
PyInt_Type
.
tp_as_number
->
nb_xor
(
a
,
b
);
return
PyBool_FromLong
(
((
PyBoolObject
*
)
a
)
->
ob_ival
^ ((
PyBoolObject
*
)
b
)
->
ob_ival
);
}
/* Doc string */
PyDoc_STRVAR
(
bool_doc
,
"bool(x) -> bool\n\
\n\
Returns True when the argument x is true, False otherwise.\n\
The builtins True and False are the only two instances of the class bool.\n\
The class bool is a subclass of the class int, and cannot be subclassed."
);
/* Arithmetic methods -- only so we can override &, |, ^. */
static
PyNumberMethods
bool_as_number
=
{
0
,
/* nb_add */
0
,
/* nb_subtract */
0
,
/* nb_multiply */
0
,
/* nb_divide */
0
,
/* nb_remainder */
0
,
/* nb_divmod */
0
,
/* nb_power */
0
,
/* nb_negative */
0
,
/* nb_positive */
0
,
/* nb_absolute */
0
,
/* nb_nonzero */
0
,
/* nb_invert */
0
,
/* nb_lshift */
0
,
/* nb_rshift */
bool_and
,
/* nb_and */
bool_xor
,
/* nb_xor */
bool_or
,
/* nb_or */
0
,
/* nb_coerce */
0
,
/* nb_int */
0
,
/* nb_long */
0
,
/* nb_float */
0
,
/* nb_oct */
0
,
/* nb_hex */
0
,
/* nb_inplace_add */
0
,
/* nb_inplace_subtract */
0
,
/* nb_inplace_multiply */
0
,
/* nb_inplace_divide */
0
,
/* nb_inplace_remainder */
0
,
/* nb_inplace_power */
0
,
/* nb_inplace_lshift */
0
,
/* nb_inplace_rshift */
0
,
/* nb_inplace_and */
0
,
/* nb_inplace_xor */
0
,
/* nb_inplace_or */
0
,
/* nb_floor_divide */
0
,
/* nb_true_divide */
0
,
/* nb_inplace_floor_divide */
0
,
/* nb_inplace_true_divide */
};
/* The type object for bool. Note that this cannot be subclassed! */
PyTypeObject
PyBool_Type
=
{
PyVarObject_HEAD_INIT
(
&
PyType_Type
,
0
)
"bool"
,
sizeof
(
PyIntObject
),
0
,
0
,
/* tp_dealloc */
(
printfunc
)
bool_print
,
/* tp_print */
0
,
/* tp_getattr */
0
,
/* tp_setattr */
0
,
/* tp_compare */
(
reprfunc
)
bool_repr
,
/* tp_repr */
&
bool_as_number
,
/* tp_as_number */
0
,
/* tp_as_sequence */
0
,
/* tp_as_mapping */
0
,
/* tp_hash */
0
,
/* tp_call */
(
reprfunc
)
bool_repr
,
/* tp_str */
0
,
/* tp_getattro */
0
,
/* tp_setattro */
0
,
/* tp_as_buffer */
Py_TPFLAGS_DEFAULT
|
Py_TPFLAGS_CHECKTYPES
,
/* tp_flags */
bool_doc
,
/* tp_doc */
0
,
/* tp_traverse */
0
,
/* tp_clear */
0
,
/* tp_richcompare */
0
,
/* tp_weaklistoffset */
0
,
/* tp_iter */
0
,
/* tp_iternext */
0
,
/* tp_methods */
0
,
/* tp_members */
0
,
/* tp_getset */
&
PyInt_Type
,
/* tp_base */
0
,
/* tp_dict */
0
,
/* tp_descr_get */
0
,
/* tp_descr_set */
0
,
/* tp_dictoffset */
0
,
/* tp_init */
0
,
/* tp_alloc */
bool_new
,
/* tp_new */
};
/* The objects representing bool values False and True */
/* Named Zero for link-level compatibility */
PyIntObject
_Py_ZeroStruct
=
{
PyObject_HEAD_INIT
(
&
PyBool_Type
)
0
};
PyIntObject
_Py_TrueStruct
=
{
PyObject_HEAD_INIT
(
&
PyBool_Type
)
1
};
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