185 lines
6.5 KiB
C
185 lines
6.5 KiB
C
/* Boolean type, a subtype of int */
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#include "Python.h"
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#include "longintrepr.h"
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/* We define bool_repr to return "False" or "True" */
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static PyObject *false_str = NULL;
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static PyObject *true_str = NULL;
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static PyObject *
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bool_repr(PyObject *self)
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{
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PyObject *s;
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if (self == Py_True)
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s = true_str ? true_str :
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(true_str = PyUnicode_InternFromString("True"));
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else
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s = false_str ? false_str :
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(false_str = PyUnicode_InternFromString("False"));
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Py_XINCREF(s);
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return s;
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}
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/* Function to return a bool from a C long */
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PyObject *PyBool_FromLong(long ok)
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{
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PyObject *result;
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if (ok)
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result = Py_True;
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else
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result = Py_False;
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Py_INCREF(result);
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return result;
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}
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/* We define bool_new to always return either Py_True or Py_False */
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static PyObject *
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bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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static char *kwlist[] = {"x", 0};
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PyObject *x = Py_False;
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long ok;
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x))
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return NULL;
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ok = PyObject_IsTrue(x);
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if (ok < 0)
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return NULL;
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return PyBool_FromLong(ok);
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}
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/* Arithmetic operations redefined to return bool if both args are bool. */
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static PyObject *
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bool_and(PyObject *a, PyObject *b)
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{
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if (!PyBool_Check(a) || !PyBool_Check(b))
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return PyLong_Type.tp_as_number->nb_and(a, b);
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return PyBool_FromLong((a == Py_True) & (b == Py_True));
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}
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static PyObject *
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bool_or(PyObject *a, PyObject *b)
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{
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if (!PyBool_Check(a) || !PyBool_Check(b))
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return PyLong_Type.tp_as_number->nb_or(a, b);
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return PyBool_FromLong((a == Py_True) | (b == Py_True));
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}
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static PyObject *
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bool_xor(PyObject *a, PyObject *b)
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{
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if (!PyBool_Check(a) || !PyBool_Check(b))
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return PyLong_Type.tp_as_number->nb_xor(a, b);
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return PyBool_FromLong((a == Py_True) ^ (b == Py_True));
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}
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/* Doc string */
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PyDoc_STRVAR(bool_doc,
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"bool(x) -> bool\n\
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\n\
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Returns True when the argument x is true, False otherwise.\n\
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The builtins True and False are the only two instances of the class bool.\n\
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The class bool is a subclass of the class int, and cannot be subclassed.");
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/* Arithmetic methods -- only so we can override &, |, ^. */
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static PyNumberMethods bool_as_number = {
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0, /* nb_add */
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0, /* nb_subtract */
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0, /* nb_multiply */
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0, /* nb_remainder */
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0, /* nb_divmod */
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0, /* nb_power */
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0, /* nb_negative */
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0, /* nb_positive */
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0, /* nb_absolute */
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0, /* nb_bool */
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0, /* nb_invert */
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0, /* nb_lshift */
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0, /* nb_rshift */
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bool_and, /* nb_and */
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bool_xor, /* nb_xor */
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bool_or, /* nb_or */
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0, /* nb_int */
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0, /* nb_reserved */
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0, /* nb_float */
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0, /* nb_inplace_add */
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0, /* nb_inplace_subtract */
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0, /* nb_inplace_multiply */
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0, /* nb_inplace_remainder */
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0, /* nb_inplace_power */
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0, /* nb_inplace_lshift */
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0, /* nb_inplace_rshift */
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0, /* nb_inplace_and */
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0, /* nb_inplace_xor */
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0, /* nb_inplace_or */
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0, /* nb_floor_divide */
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0, /* nb_true_divide */
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0, /* nb_inplace_floor_divide */
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0, /* nb_inplace_true_divide */
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0, /* nb_index */
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};
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/* The type object for bool. Note that this cannot be subclassed! */
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PyTypeObject PyBool_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"bool",
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sizeof(struct _longobject),
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0,
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0, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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bool_repr, /* tp_repr */
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&bool_as_number, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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bool_repr, /* tp_str */
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0, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT, /* tp_flags */
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bool_doc, /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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0, /* tp_getset */
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&PyLong_Type, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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0, /* tp_init */
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0, /* tp_alloc */
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bool_new, /* tp_new */
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};
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/* The objects representing bool values False and True */
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struct _longobject _Py_FalseStruct = {
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PyVarObject_HEAD_INIT(&PyBool_Type, 0)
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{ 0 }
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};
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struct _longobject _Py_TrueStruct = {
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PyVarObject_HEAD_INIT(&PyBool_Type, 1)
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{ 1 }
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};
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