Georg Brandl | 8ec7f65 | 2007-08-15 14:28:01 +0000 | [diff] [blame^] | 1 | #include <Python.h> |
| 2 | #include "structmember.h" |
| 3 | |
| 4 | typedef struct { |
| 5 | PyObject_HEAD |
| 6 | PyObject *first; |
| 7 | PyObject *last; |
| 8 | int number; |
| 9 | } Noddy; |
| 10 | |
| 11 | static int |
| 12 | Noddy_traverse(Noddy *self, visitproc visit, void *arg) |
| 13 | { |
| 14 | int vret; |
| 15 | |
| 16 | if (self->first) { |
| 17 | vret = visit(self->first, arg); |
| 18 | if (vret != 0) |
| 19 | return vret; |
| 20 | } |
| 21 | if (self->last) { |
| 22 | vret = visit(self->last, arg); |
| 23 | if (vret != 0) |
| 24 | return vret; |
| 25 | } |
| 26 | |
| 27 | return 0; |
| 28 | } |
| 29 | |
| 30 | static int |
| 31 | Noddy_clear(Noddy *self) |
| 32 | { |
| 33 | PyObject *tmp; |
| 34 | |
| 35 | tmp = self->first; |
| 36 | self->first = NULL; |
| 37 | Py_XDECREF(tmp); |
| 38 | |
| 39 | tmp = self->last; |
| 40 | self->last = NULL; |
| 41 | Py_XDECREF(tmp); |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static void |
| 47 | Noddy_dealloc(Noddy* self) |
| 48 | { |
| 49 | Noddy_clear(self); |
| 50 | self->ob_type->tp_free((PyObject*)self); |
| 51 | } |
| 52 | |
| 53 | static PyObject * |
| 54 | Noddy_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 55 | { |
| 56 | Noddy *self; |
| 57 | |
| 58 | self = (Noddy *)type->tp_alloc(type, 0); |
| 59 | if (self != NULL) { |
| 60 | self->first = PyString_FromString(""); |
| 61 | if (self->first == NULL) |
| 62 | { |
| 63 | Py_DECREF(self); |
| 64 | return NULL; |
| 65 | } |
| 66 | |
| 67 | self->last = PyString_FromString(""); |
| 68 | if (self->last == NULL) |
| 69 | { |
| 70 | Py_DECREF(self); |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | self->number = 0; |
| 75 | } |
| 76 | |
| 77 | return (PyObject *)self; |
| 78 | } |
| 79 | |
| 80 | static int |
| 81 | Noddy_init(Noddy *self, PyObject *args, PyObject *kwds) |
| 82 | { |
| 83 | PyObject *first=NULL, *last=NULL, *tmp; |
| 84 | |
| 85 | static char *kwlist[] = {"first", "last", "number", NULL}; |
| 86 | |
| 87 | if (! PyArg_ParseTupleAndKeywords(args, kwds, "|OOi", kwlist, |
| 88 | &first, &last, |
| 89 | &self->number)) |
| 90 | return -1; |
| 91 | |
| 92 | if (first) { |
| 93 | tmp = self->first; |
| 94 | Py_INCREF(first); |
| 95 | self->first = first; |
| 96 | Py_XDECREF(tmp); |
| 97 | } |
| 98 | |
| 99 | if (last) { |
| 100 | tmp = self->last; |
| 101 | Py_INCREF(last); |
| 102 | self->last = last; |
| 103 | Py_XDECREF(tmp); |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | |
| 110 | static PyMemberDef Noddy_members[] = { |
| 111 | {"first", T_OBJECT_EX, offsetof(Noddy, first), 0, |
| 112 | "first name"}, |
| 113 | {"last", T_OBJECT_EX, offsetof(Noddy, last), 0, |
| 114 | "last name"}, |
| 115 | {"number", T_INT, offsetof(Noddy, number), 0, |
| 116 | "noddy number"}, |
| 117 | {NULL} /* Sentinel */ |
| 118 | }; |
| 119 | |
| 120 | static PyObject * |
| 121 | Noddy_name(Noddy* self) |
| 122 | { |
| 123 | static PyObject *format = NULL; |
| 124 | PyObject *args, *result; |
| 125 | |
| 126 | if (format == NULL) { |
| 127 | format = PyString_FromString("%s %s"); |
| 128 | if (format == NULL) |
| 129 | return NULL; |
| 130 | } |
| 131 | |
| 132 | if (self->first == NULL) { |
| 133 | PyErr_SetString(PyExc_AttributeError, "first"); |
| 134 | return NULL; |
| 135 | } |
| 136 | |
| 137 | if (self->last == NULL) { |
| 138 | PyErr_SetString(PyExc_AttributeError, "last"); |
| 139 | return NULL; |
| 140 | } |
| 141 | |
| 142 | args = Py_BuildValue("OO", self->first, self->last); |
| 143 | if (args == NULL) |
| 144 | return NULL; |
| 145 | |
| 146 | result = PyString_Format(format, args); |
| 147 | Py_DECREF(args); |
| 148 | |
| 149 | return result; |
| 150 | } |
| 151 | |
| 152 | static PyMethodDef Noddy_methods[] = { |
| 153 | {"name", (PyCFunction)Noddy_name, METH_NOARGS, |
| 154 | "Return the name, combining the first and last name" |
| 155 | }, |
| 156 | {NULL} /* Sentinel */ |
| 157 | }; |
| 158 | |
| 159 | static PyTypeObject NoddyType = { |
| 160 | PyObject_HEAD_INIT(NULL) |
| 161 | 0, /*ob_size*/ |
| 162 | "noddy.Noddy", /*tp_name*/ |
| 163 | sizeof(Noddy), /*tp_basicsize*/ |
| 164 | 0, /*tp_itemsize*/ |
| 165 | (destructor)Noddy_dealloc, /*tp_dealloc*/ |
| 166 | 0, /*tp_print*/ |
| 167 | 0, /*tp_getattr*/ |
| 168 | 0, /*tp_setattr*/ |
| 169 | 0, /*tp_compare*/ |
| 170 | 0, /*tp_repr*/ |
| 171 | 0, /*tp_as_number*/ |
| 172 | 0, /*tp_as_sequence*/ |
| 173 | 0, /*tp_as_mapping*/ |
| 174 | 0, /*tp_hash */ |
| 175 | 0, /*tp_call*/ |
| 176 | 0, /*tp_str*/ |
| 177 | 0, /*tp_getattro*/ |
| 178 | 0, /*tp_setattro*/ |
| 179 | 0, /*tp_as_buffer*/ |
| 180 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, /*tp_flags*/ |
| 181 | "Noddy objects", /* tp_doc */ |
| 182 | (traverseproc)Noddy_traverse, /* tp_traverse */ |
| 183 | (inquiry)Noddy_clear, /* tp_clear */ |
| 184 | 0, /* tp_richcompare */ |
| 185 | 0, /* tp_weaklistoffset */ |
| 186 | 0, /* tp_iter */ |
| 187 | 0, /* tp_iternext */ |
| 188 | Noddy_methods, /* tp_methods */ |
| 189 | Noddy_members, /* tp_members */ |
| 190 | 0, /* tp_getset */ |
| 191 | 0, /* tp_base */ |
| 192 | 0, /* tp_dict */ |
| 193 | 0, /* tp_descr_get */ |
| 194 | 0, /* tp_descr_set */ |
| 195 | 0, /* tp_dictoffset */ |
| 196 | (initproc)Noddy_init, /* tp_init */ |
| 197 | 0, /* tp_alloc */ |
| 198 | Noddy_new, /* tp_new */ |
| 199 | }; |
| 200 | |
| 201 | static PyMethodDef module_methods[] = { |
| 202 | {NULL} /* Sentinel */ |
| 203 | }; |
| 204 | |
| 205 | #ifndef PyMODINIT_FUNC /* declarations for DLL import/export */ |
| 206 | #define PyMODINIT_FUNC void |
| 207 | #endif |
| 208 | PyMODINIT_FUNC |
| 209 | initnoddy4(void) |
| 210 | { |
| 211 | PyObject* m; |
| 212 | |
| 213 | if (PyType_Ready(&NoddyType) < 0) |
| 214 | return; |
| 215 | |
| 216 | m = Py_InitModule3("noddy4", module_methods, |
| 217 | "Example module that creates an extension type."); |
| 218 | |
| 219 | if (m == NULL) |
| 220 | return; |
| 221 | |
| 222 | Py_INCREF(&NoddyType); |
| 223 | PyModule_AddObject(m, "Noddy", (PyObject *)&NoddyType); |
| 224 | } |