Mercurial > lcfOS

comparison cos/python/Objects/boolobject.c @ 27:7f74363f4c82

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added some files for the python port
author windel
date Tue, 27 Dec 2011 18:59:02 +0100
parents
children
comparison
equal deleted inserted replaced
26:dcce92b1efbc 27:7f74363f4c82
1 /* Boolean type, a subtype of int */
2
3 #include "Python.h"
4 #include "longintrepr.h"
5
6 /* We define bool_repr to return "False" or "True" */
7
8 static PyObject *false_str = NULL;
9 static PyObject *true_str = NULL;
10
11 static PyObject *
12 bool_repr(PyObject *self)
13 {
14 PyObject *s;
15
16 if (self == Py_True)
17 s = true_str ? true_str :
18 (true_str = PyUnicode_InternFromString("True"));
19 else
20 s = false_str ? false_str :
21 (false_str = PyUnicode_InternFromString("False"));
22 Py_XINCREF(s);
23 return s;
24 }
25
26 /* Function to return a bool from a C long */
27
28 PyObject *PyBool_FromLong(long ok)
29 {
30 PyObject *result;
31
32 if (ok)
33 result = Py_True;
34 else
35 result = Py_False;
36 Py_INCREF(result);
37 return result;
38 }
39
40 /* We define bool_new to always return either Py_True or Py_False */
41
42 static PyObject *
43 bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
44 {
45 static char *kwlist[] = {"x", 0};
46 PyObject *x = Py_False;
47 long ok;
48
49 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x))
50 return NULL;
51 ok = PyObject_IsTrue(x);
52 if (ok < 0)
53 return NULL;
54 return PyBool_FromLong(ok);
55 }
56
57 /* Arithmetic operations redefined to return bool if both args are bool. */
58
59 static PyObject *
60 bool_and(PyObject *a, PyObject *b)
61 {
62 if (!PyBool_Check(a) || !PyBool_Check(b))
63 return PyLong_Type.tp_as_number->nb_and(a, b);
64 return PyBool_FromLong((a == Py_True) & (b == Py_True));
65 }
66
67 static PyObject *
68 bool_or(PyObject *a, PyObject *b)
69 {
70 if (!PyBool_Check(a) || !PyBool_Check(b))
71 return PyLong_Type.tp_as_number->nb_or(a, b);
72 return PyBool_FromLong((a == Py_True) | (b == Py_True));
73 }
74
75 static PyObject *
76 bool_xor(PyObject *a, PyObject *b)
77 {
78 if (!PyBool_Check(a) || !PyBool_Check(b))
79 return PyLong_Type.tp_as_number->nb_xor(a, b);
80 return PyBool_FromLong((a == Py_True) ^ (b == Py_True));
81 }
82
83 /* Doc string */
84
85 PyDoc_STRVAR(bool_doc,
86 "bool(x) -> bool\n\
87 \n\
88 Returns True when the argument x is true, False otherwise.\n\
89 The builtins True and False are the only two instances of the class bool.\n\
90 The class bool is a subclass of the class int, and cannot be subclassed.");
91
92 /* Arithmetic methods -- only so we can override &, |, ^. */
93
94 static PyNumberMethods bool_as_number = {
95 0, /* nb_add */
96 0, /* nb_subtract */
97 0, /* nb_multiply */
98 0, /* nb_remainder */
99 0, /* nb_divmod */
100 0, /* nb_power */
101 0, /* nb_negative */
102 0, /* nb_positive */
103 0, /* nb_absolute */
104 0, /* nb_bool */
105 0, /* nb_invert */
106 0, /* nb_lshift */
107 0, /* nb_rshift */
108 bool_and, /* nb_and */
109 bool_xor, /* nb_xor */
110 bool_or, /* nb_or */
111 0, /* nb_int */
112 0, /* nb_reserved */
113 0, /* nb_float */
114 0, /* nb_inplace_add */
115 0, /* nb_inplace_subtract */
116 0, /* nb_inplace_multiply */
117 0, /* nb_inplace_remainder */
118 0, /* nb_inplace_power */
119 0, /* nb_inplace_lshift */
120 0, /* nb_inplace_rshift */
121 0, /* nb_inplace_and */
122 0, /* nb_inplace_xor */
123 0, /* nb_inplace_or */
124 0, /* nb_floor_divide */
125 0, /* nb_true_divide */
126 0, /* nb_inplace_floor_divide */
127 0, /* nb_inplace_true_divide */
128 0, /* nb_index */
129 };
130
131 /* The type object for bool. Note that this cannot be subclassed! */
132
133 PyTypeObject PyBool_Type = {
134 PyVarObject_HEAD_INIT(&PyType_Type, 0)
135 "bool",
136 sizeof(struct _longobject),
137 0,
138 0, /* tp_dealloc */
139 0, /* tp_print */
140 0, /* tp_getattr */
141 0, /* tp_setattr */
142 0, /* tp_reserved */
143 bool_repr, /* tp_repr */
144 &bool_as_number, /* tp_as_number */
145 0, /* tp_as_sequence */
146 0, /* tp_as_mapping */
147 0, /* tp_hash */
148 0, /* tp_call */
149 bool_repr, /* tp_str */
150 0, /* tp_getattro */
151 0, /* tp_setattro */
152 0, /* tp_as_buffer */
153 Py_TPFLAGS_DEFAULT, /* tp_flags */
154 bool_doc, /* tp_doc */
155 0, /* tp_traverse */
156 0, /* tp_clear */
157 0, /* tp_richcompare */
158 0, /* tp_weaklistoffset */
159 0, /* tp_iter */
160 0, /* tp_iternext */
161 0, /* tp_methods */
162 0, /* tp_members */
163 0, /* tp_getset */
164 &PyLong_Type, /* tp_base */
165 0, /* tp_dict */
166 0, /* tp_descr_get */
167 0, /* tp_descr_set */
168 0, /* tp_dictoffset */
169 0, /* tp_init */
170 0, /* tp_alloc */
171 bool_new, /* tp_new */
172 };
173
174 /* The objects representing bool values False and True */
175
176 struct _longobject _Py_FalseStruct = {
177 PyVarObject_HEAD_INIT(&PyBool_Type, 0)
178 { 0 }
179 };
180
181 struct _longobject _Py_TrueStruct = {
182 PyVarObject_HEAD_INIT(&PyBool_Type, 1)
183 { 1 }
184 };