Objects/xxobject.c

   1 /***********************************************************
   2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
   3 The Netherlands.
   4
   5                         All Rights Reserved
   6
   7 Permission to use, copy, modify, and distribute this software and its
   8 documentation for any purpose and without fee is hereby granted,
   9 provided that the above copyright notice appear in all copies and that
  10 both that copyright notice and this permission notice appear in
  11 supporting documentation, and that the names of Stichting Mathematisch
  12 Centrum or CWI or Corporation for National Research Initiatives or
  13 CNRI not be used in advertising or publicity pertaining to
  14 distribution of the software without specific, written prior
  15 permission.
  16
  17 While CWI is the initial source for this software, a modified version
  18 is made available by the Corporation for National Research Initiatives
  19 (CNRI) at the Internet address ftp://ftp.python.org.
  20
  21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  28 PERFORMANCE OF THIS SOFTWARE.
  29
  30 ******************************************************************/
  31
  32 /* Use this file as a template to start implementing a new object type.
  33    If your objects will be called foobar, start by copying this file to
  34    foobarobject.c, changing all occurrences of xx to foobar and all
  35    occurrences of Xx by Foobar.  You will probably want to delete all
  36    references to 'x_attr' and add your own types of attributes
  37    instead.  Maybe you want to name your local variables other than
  38    'xp'.  If your object type is needed in other files, you'll have to
  39    create a file "foobarobject.h"; see intobject.h for an example. */
  40
  41
  42 /* Xx objects */
  43
  44 #include "Python.h"
  45
  46 typedef struct {
  47         PyObject_HEAD
  48         PyObject        *x_attr;        /* Attributes dictionary */
  49 } xxobject;
  50
  51 staticforward PyTypeObject Xxtype;
  52
  53 #define is_xxobject(v)          ((v)->ob_type == &Xxtype)
  54
  55 static xxobject *
  56 newxxobject(arg)
  57         PyObject *arg;
  58 {
  59         xxobject *xp;
  60         xp = PyObject_NEW(xxobject, &Xxtype);
  61         if (xp == NULL)
  62                 return NULL;
  63         xp->x_attr = NULL;
  64         return xp;
  65 }
  66
  67 /* Xx methods */
  68
  69 static void
  70 xx_dealloc(xp)
  71         xxobject *xp;
  72 {
  73         Py_XDECREF(xp->x_attr);
  74         PyMem_DEL(xp);
  75 }
  76
  77 static PyObject *
  78 xx_demo(self, args)
  79         xxobject *self;
  80         PyObject *args;
  81 {
  82         if (!PyArg_NoArgs(args))
  83                 return NULL;
  84         Py_INCREF(Py_None);
  85         return Py_None;
  86 }
  87
  88 static PyMethodDef xx_methods[] = {
  89         {"demo",        (PyCFunction)xx_demo},
  90         {NULL,          NULL}           /* sentinel */
  91 };
  92
  93 static PyObject *
  94 xx_getattr(xp, name)
  95         xxobject *xp;
  96         char *name;
  97 {
  98         if (xp->x_attr != NULL) {
  99                 PyObject *v = PyDict_GetItemString(xp->x_attr, name);
 100                 if (v != NULL) {
 101                         Py_INCREF(v);
 102                         return v;
 103                 }
 104         }
 105         return Py_FindMethod(xx_methods, (PyObject *)xp, name);
 106 }
 107
 108 static int
 109 xx_setattr(xp, name, v)
 110         xxobject *xp;
 111         char *name;
 112         PyObject *v;
 113 {
 114         if (xp->x_attr == NULL) {
 115                 xp->x_attr = PyDict_New();
 116                 if (xp->x_attr == NULL)
 117                         return -1;
 118         }
 119         if (v == NULL) {
 120                 int rv = PyDict_DelItemString(xp->x_attr, name);
 121                 if (rv < 0)
 122                         PyErr_SetString(PyExc_AttributeError,
 123                                 "delete non-existing xx attribute");
 124                 return rv;
 125         }
 126         else
 127                 return PyDict_SetItemString(xp->x_attr, name, v);
 128 }
 129
 130 static PyTypeObject Xxtype = {
 131         PyObject_HEAD_INIT(&PyType_Type)
 132         0,                      /*ob_size*/
 133         "xx",                   /*tp_name*/
 134         sizeof(xxobject),       /*tp_basicsize*/
 135         0,                      /*tp_itemsize*/
 136         /* methods */
 137         (destructor)xx_dealloc, /*tp_dealloc*/
 138         0,                      /*tp_print*/
 139         (getattrfunc)xx_getattr, /*tp_getattr*/
 140         (setattrfunc)xx_setattr, /*tp_setattr*/
 141         0,                      /*tp_compare*/
 142         0,                      /*tp_repr*/
 143         0,                      /*tp_as_number*/
 144         0,                      /*tp_as_sequence*/
 145         0,                      /*tp_as_mapping*/
 146         0,                      /*tp_hash*/
 147 };