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/* Boolean type, a subtype of int */
#include "Python.h"
#include "pycore_object.h" // _Py_FatalRefcountError()
#include "pycore_runtime.h" // _Py_ID()
/* We define bool_repr to return "False" or "True" */
static PyObject *
bool_repr(PyObject *self)
{
PyObject *res = self == Py_True ? &_Py_ID(True) : &_Py_ID(False);
return Py_NewRef(res);
}
/* 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)
{
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_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(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_remainder */
0, /* nb_divmod */
0, /* nb_power */
0, /* nb_negative */
0, /* nb_positive */
0, /* nb_absolute */
0, /* nb_bool */
0, /* 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 _Py_NO_RETURN
bool_dealloc(PyObject* Py_UNUSED(ignore))
{
_Py_FatalRefcountError("deallocating True or False");
}
/* The type object for bool. Note that this cannot be subclassed! */
PyTypeObject PyBool_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"bool",
sizeof(struct _longobject),
0,
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 = {
PyVarObject_HEAD_INIT(&PyBool_Type, 0)
{ 0 }
};
struct _longobject _Py_TrueStruct = {
PyVarObject_HEAD_INIT(&PyBool_Type, 1)
{ 1 }
};
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