1 | /* Boolean type, a subtype of int */
|
---|
2 |
|
---|
3 | #include "Python.h"
|
---|
4 |
|
---|
5 | /* We need to define bool_print to override int_print */
|
---|
6 |
|
---|
7 | static int
|
---|
8 | bool_print(PyBoolObject *self, FILE *fp, int flags)
|
---|
9 | {
|
---|
10 | Py_BEGIN_ALLOW_THREADS
|
---|
11 | fputs(self->ob_ival == 0 ? "False" : "True", fp);
|
---|
12 | Py_END_ALLOW_THREADS
|
---|
13 | return 0;
|
---|
14 | }
|
---|
15 |
|
---|
16 | /* We define bool_repr to return "False" or "True" */
|
---|
17 |
|
---|
18 | static PyObject *false_str = NULL;
|
---|
19 | static PyObject *true_str = NULL;
|
---|
20 |
|
---|
21 | static PyObject *
|
---|
22 | bool_repr(PyBoolObject *self)
|
---|
23 | {
|
---|
24 | PyObject *s;
|
---|
25 |
|
---|
26 | if (self->ob_ival)
|
---|
27 | s = true_str ? true_str :
|
---|
28 | (true_str = PyString_InternFromString("True"));
|
---|
29 | else
|
---|
30 | s = false_str ? false_str :
|
---|
31 | (false_str = PyString_InternFromString("False"));
|
---|
32 | Py_XINCREF(s);
|
---|
33 | return s;
|
---|
34 | }
|
---|
35 |
|
---|
36 | /* Function to return a bool from a C long */
|
---|
37 |
|
---|
38 | PyObject *PyBool_FromLong(long ok)
|
---|
39 | {
|
---|
40 | PyObject *result;
|
---|
41 |
|
---|
42 | if (ok)
|
---|
43 | result = Py_True;
|
---|
44 | else
|
---|
45 | result = Py_False;
|
---|
46 | Py_INCREF(result);
|
---|
47 | return result;
|
---|
48 | }
|
---|
49 |
|
---|
50 | /* We define bool_new to always return either Py_True or Py_False */
|
---|
51 |
|
---|
52 | static PyObject *
|
---|
53 | bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
---|
54 | {
|
---|
55 | static char *kwlist[] = {"x", 0};
|
---|
56 | PyObject *x = Py_False;
|
---|
57 | long ok;
|
---|
58 |
|
---|
59 | if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x))
|
---|
60 | return NULL;
|
---|
61 | ok = PyObject_IsTrue(x);
|
---|
62 | if (ok < 0)
|
---|
63 | return NULL;
|
---|
64 | return PyBool_FromLong(ok);
|
---|
65 | }
|
---|
66 |
|
---|
67 | /* Arithmetic operations redefined to return bool if both args are bool. */
|
---|
68 |
|
---|
69 | static PyObject *
|
---|
70 | bool_and(PyObject *a, PyObject *b)
|
---|
71 | {
|
---|
72 | if (!PyBool_Check(a) || !PyBool_Check(b))
|
---|
73 | return PyInt_Type.tp_as_number->nb_and(a, b);
|
---|
74 | return PyBool_FromLong(
|
---|
75 | ((PyBoolObject *)a)->ob_ival & ((PyBoolObject *)b)->ob_ival);
|
---|
76 | }
|
---|
77 |
|
---|
78 | static PyObject *
|
---|
79 | bool_or(PyObject *a, PyObject *b)
|
---|
80 | {
|
---|
81 | if (!PyBool_Check(a) || !PyBool_Check(b))
|
---|
82 | return PyInt_Type.tp_as_number->nb_or(a, b);
|
---|
83 | return PyBool_FromLong(
|
---|
84 | ((PyBoolObject *)a)->ob_ival | ((PyBoolObject *)b)->ob_ival);
|
---|
85 | }
|
---|
86 |
|
---|
87 | static PyObject *
|
---|
88 | bool_xor(PyObject *a, PyObject *b)
|
---|
89 | {
|
---|
90 | if (!PyBool_Check(a) || !PyBool_Check(b))
|
---|
91 | return PyInt_Type.tp_as_number->nb_xor(a, b);
|
---|
92 | return PyBool_FromLong(
|
---|
93 | ((PyBoolObject *)a)->ob_ival ^ ((PyBoolObject *)b)->ob_ival);
|
---|
94 | }
|
---|
95 |
|
---|
96 | /* Doc string */
|
---|
97 |
|
---|
98 | PyDoc_STRVAR(bool_doc,
|
---|
99 | "bool(x) -> bool\n\
|
---|
100 | \n\
|
---|
101 | Returns True when the argument x is true, False otherwise.\n\
|
---|
102 | The builtins True and False are the only two instances of the class bool.\n\
|
---|
103 | The class bool is a subclass of the class int, and cannot be subclassed.");
|
---|
104 |
|
---|
105 | /* Arithmetic methods -- only so we can override &, |, ^. */
|
---|
106 |
|
---|
107 | static PyNumberMethods bool_as_number = {
|
---|
108 | 0, /* nb_add */
|
---|
109 | 0, /* nb_subtract */
|
---|
110 | 0, /* nb_multiply */
|
---|
111 | 0, /* nb_divide */
|
---|
112 | 0, /* nb_remainder */
|
---|
113 | 0, /* nb_divmod */
|
---|
114 | 0, /* nb_power */
|
---|
115 | 0, /* nb_negative */
|
---|
116 | 0, /* nb_positive */
|
---|
117 | 0, /* nb_absolute */
|
---|
118 | 0, /* nb_nonzero */
|
---|
119 | 0, /* nb_invert */
|
---|
120 | 0, /* nb_lshift */
|
---|
121 | 0, /* nb_rshift */
|
---|
122 | bool_and, /* nb_and */
|
---|
123 | bool_xor, /* nb_xor */
|
---|
124 | bool_or, /* nb_or */
|
---|
125 | 0, /* nb_coerce */
|
---|
126 | 0, /* nb_int */
|
---|
127 | 0, /* nb_long */
|
---|
128 | 0, /* nb_float */
|
---|
129 | 0, /* nb_oct */
|
---|
130 | 0, /* nb_hex */
|
---|
131 | 0, /* nb_inplace_add */
|
---|
132 | 0, /* nb_inplace_subtract */
|
---|
133 | 0, /* nb_inplace_multiply */
|
---|
134 | 0, /* nb_inplace_divide */
|
---|
135 | 0, /* nb_inplace_remainder */
|
---|
136 | 0, /* nb_inplace_power */
|
---|
137 | 0, /* nb_inplace_lshift */
|
---|
138 | 0, /* nb_inplace_rshift */
|
---|
139 | 0, /* nb_inplace_and */
|
---|
140 | 0, /* nb_inplace_xor */
|
---|
141 | 0, /* nb_inplace_or */
|
---|
142 | 0, /* nb_floor_divide */
|
---|
143 | 0, /* nb_true_divide */
|
---|
144 | 0, /* nb_inplace_floor_divide */
|
---|
145 | 0, /* nb_inplace_true_divide */
|
---|
146 | };
|
---|
147 |
|
---|
148 | /* The type object for bool. Note that this cannot be subclassed! */
|
---|
149 |
|
---|
150 | PyTypeObject PyBool_Type = {
|
---|
151 | PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
---|
152 | "bool",
|
---|
153 | sizeof(PyIntObject),
|
---|
154 | 0,
|
---|
155 | 0, /* tp_dealloc */
|
---|
156 | (printfunc)bool_print, /* tp_print */
|
---|
157 | 0, /* tp_getattr */
|
---|
158 | 0, /* tp_setattr */
|
---|
159 | 0, /* tp_compare */
|
---|
160 | (reprfunc)bool_repr, /* tp_repr */
|
---|
161 | &bool_as_number, /* tp_as_number */
|
---|
162 | 0, /* tp_as_sequence */
|
---|
163 | 0, /* tp_as_mapping */
|
---|
164 | 0, /* tp_hash */
|
---|
165 | 0, /* tp_call */
|
---|
166 | (reprfunc)bool_repr, /* tp_str */
|
---|
167 | 0, /* tp_getattro */
|
---|
168 | 0, /* tp_setattro */
|
---|
169 | 0, /* tp_as_buffer */
|
---|
170 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES, /* tp_flags */
|
---|
171 | bool_doc, /* tp_doc */
|
---|
172 | 0, /* tp_traverse */
|
---|
173 | 0, /* tp_clear */
|
---|
174 | 0, /* tp_richcompare */
|
---|
175 | 0, /* tp_weaklistoffset */
|
---|
176 | 0, /* tp_iter */
|
---|
177 | 0, /* tp_iternext */
|
---|
178 | 0, /* tp_methods */
|
---|
179 | 0, /* tp_members */
|
---|
180 | 0, /* tp_getset */
|
---|
181 | &PyInt_Type, /* tp_base */
|
---|
182 | 0, /* tp_dict */
|
---|
183 | 0, /* tp_descr_get */
|
---|
184 | 0, /* tp_descr_set */
|
---|
185 | 0, /* tp_dictoffset */
|
---|
186 | 0, /* tp_init */
|
---|
187 | 0, /* tp_alloc */
|
---|
188 | bool_new, /* tp_new */
|
---|
189 | };
|
---|
190 |
|
---|
191 | /* The objects representing bool values False and True */
|
---|
192 |
|
---|
193 | /* Named Zero for link-level compatibility */
|
---|
194 | PyIntObject _Py_ZeroStruct = {
|
---|
195 | PyObject_HEAD_INIT(&PyBool_Type)
|
---|
196 | 0
|
---|
197 | };
|
---|
198 |
|
---|
199 | PyIntObject _Py_TrueStruct = {
|
---|
200 | PyObject_HEAD_INIT(&PyBool_Type)
|
---|
201 | 1
|
---|
202 | };
|
---|