mirror of
https://github.com/python/cpython
synced 2024-09-06 03:34:04 +00:00
228 lines
8 KiB
C
228 lines
8 KiB
C
/* Boolean type, a subtype of int */
|
|
|
|
#include "Python.h"
|
|
#include "pycore_long.h" // FALSE_TAG TRUE_TAG
|
|
#include "pycore_modsupport.h" // _PyArg_NoKwnames()
|
|
#include "pycore_object.h" // _Py_FatalRefcountError()
|
|
#include "pycore_runtime.h" // _Py_ID()
|
|
|
|
#include <stddef.h>
|
|
|
|
/* We define bool_repr to return "False" or "True" */
|
|
|
|
static PyObject *
|
|
bool_repr(PyObject *self)
|
|
{
|
|
return self == Py_True ? &_Py_ID(True) : &_Py_ID(False);
|
|
}
|
|
|
|
/* Function to return a bool from a C long */
|
|
|
|
PyObject *PyBool_FromLong(long ok)
|
|
{
|
|
return ok ? Py_True : Py_False;
|
|
}
|
|
|
|
/* We define bool_new to always return either Py_True or Py_False */
|
|
|
|
static PyObject *
|
|
bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
|
{
|
|
PyObject *x = Py_False;
|
|
long ok;
|
|
|
|
if (!_PyArg_NoKeywords("bool", kwds))
|
|
return NULL;
|
|
if (!PyArg_UnpackTuple(args, "bool", 0, 1, &x))
|
|
return NULL;
|
|
ok = PyObject_IsTrue(x);
|
|
if (ok < 0)
|
|
return NULL;
|
|
return PyBool_FromLong(ok);
|
|
}
|
|
|
|
static PyObject *
|
|
bool_vectorcall(PyObject *type, PyObject * const*args,
|
|
size_t nargsf, PyObject *kwnames)
|
|
{
|
|
long ok = 0;
|
|
if (!_PyArg_NoKwnames("bool", kwnames)) {
|
|
return NULL;
|
|
}
|
|
|
|
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
|
|
if (!_PyArg_CheckPositional("bool", nargs, 0, 1)) {
|
|
return NULL;
|
|
}
|
|
|
|
assert(PyType_Check(type));
|
|
if (nargs) {
|
|
ok = PyObject_IsTrue(args[0]);
|
|
if (ok < 0) {
|
|
return NULL;
|
|
}
|
|
}
|
|
return PyBool_FromLong(ok);
|
|
}
|
|
|
|
/* Arithmetic operations redefined to return bool if both args are bool. */
|
|
|
|
static PyObject *
|
|
bool_invert(PyObject *v)
|
|
{
|
|
if (PyErr_WarnEx(PyExc_DeprecationWarning,
|
|
"Bitwise inversion '~' on bool is deprecated. This "
|
|
"returns the bitwise inversion of the underlying int "
|
|
"object and is usually not what you expect from negating "
|
|
"a bool. Use the 'not' operator for boolean negation or "
|
|
"~int(x) if you really want the bitwise inversion of the "
|
|
"underlying int.",
|
|
1) < 0) {
|
|
return NULL;
|
|
}
|
|
return PyLong_Type.tp_as_number->nb_invert(v);
|
|
}
|
|
|
|
static PyObject *
|
|
bool_and(PyObject *a, PyObject *b)
|
|
{
|
|
if (!PyBool_Check(a) || !PyBool_Check(b))
|
|
return PyLong_Type.tp_as_number->nb_and(a, b);
|
|
return PyBool_FromLong((a == Py_True) & (b == Py_True));
|
|
}
|
|
|
|
static PyObject *
|
|
bool_or(PyObject *a, PyObject *b)
|
|
{
|
|
if (!PyBool_Check(a) || !PyBool_Check(b))
|
|
return PyLong_Type.tp_as_number->nb_or(a, b);
|
|
return PyBool_FromLong((a == Py_True) | (b == Py_True));
|
|
}
|
|
|
|
static PyObject *
|
|
bool_xor(PyObject *a, PyObject *b)
|
|
{
|
|
if (!PyBool_Check(a) || !PyBool_Check(b))
|
|
return PyLong_Type.tp_as_number->nb_xor(a, b);
|
|
return PyBool_FromLong((a == Py_True) ^ (b == Py_True));
|
|
}
|
|
|
|
/* Doc string */
|
|
|
|
PyDoc_STRVAR(bool_doc,
|
|
"bool(object=False, /)\n\
|
|
--\n\
|
|
\n\
|
|
Returns True when the argument 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_remainder */
|
|
0, /* nb_divmod */
|
|
0, /* nb_power */
|
|
0, /* nb_negative */
|
|
0, /* nb_positive */
|
|
0, /* nb_absolute */
|
|
0, /* nb_bool */
|
|
(unaryfunc)bool_invert, /* nb_invert */
|
|
0, /* nb_lshift */
|
|
0, /* nb_rshift */
|
|
bool_and, /* nb_and */
|
|
bool_xor, /* nb_xor */
|
|
bool_or, /* nb_or */
|
|
0, /* nb_int */
|
|
0, /* nb_reserved */
|
|
0, /* nb_float */
|
|
0, /* nb_inplace_add */
|
|
0, /* nb_inplace_subtract */
|
|
0, /* nb_inplace_multiply */
|
|
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 */
|
|
0, /* nb_index */
|
|
};
|
|
|
|
static void
|
|
bool_dealloc(PyObject *boolean)
|
|
{
|
|
/* This should never get called, but we also don't want to SEGV if
|
|
* we accidentally decref Booleans out of existence. Instead,
|
|
* since bools are immortal, re-set the reference count.
|
|
*/
|
|
_Py_SetImmortal(boolean);
|
|
}
|
|
|
|
/* The type object for bool. Note that this cannot be subclassed! */
|
|
|
|
PyTypeObject PyBool_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"bool",
|
|
offsetof(struct _longobject, long_value.ob_digit), /* tp_basicsize */
|
|
sizeof(digit), /* tp_itemsize */
|
|
bool_dealloc, /* tp_dealloc */
|
|
0, /* tp_vectorcall_offset */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_as_async */
|
|
bool_repr, /* tp_repr */
|
|
&bool_as_number, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
0, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT, /* 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 */
|
|
&PyLong_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 */
|
|
.tp_vectorcall = bool_vectorcall,
|
|
};
|
|
|
|
/* The objects representing bool values False and True */
|
|
|
|
struct _longobject _Py_FalseStruct = {
|
|
PyObject_HEAD_INIT(&PyBool_Type)
|
|
{ .lv_tag = _PyLong_FALSE_TAG,
|
|
{ 0 }
|
|
}
|
|
};
|
|
|
|
struct _longobject _Py_TrueStruct = {
|
|
PyObject_HEAD_INIT(&PyBool_Type)
|
|
{ .lv_tag = _PyLong_TRUE_TAG,
|
|
{ 1 }
|
|
}
|
|
};
|