ref: 1d891d163e814a93ee5346cf05b4fac297bf3a5c
dir: /sys/src/cmd/python/Objects/boolobject.c/
/* 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) { fputs(self->ob_ival == 0 ? "False" : "True", fp); 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 = { PyObject_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 };