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swig/Lib/python/pyinit.swg
Marcelo Matus 0881d3c861 Add simple PySwigObject to handle the C/C++ instance pointers, 
instead of using PyCObject or plain strings.

The new PySwigObject is even safer than PyCObject, and
more friendly than plain strings:

now you can do

  print a.this
  <Swig Object at _00691608_p_A>

  print str(a.this)
  _00691608_p_A

  print long(a.this)
  135686400

  print "%s 0x%x" % (a.this, a.this)
  _00691608_p_A 0x8166900


the last one is very useful when debugging the C/C++ side, since
is the pointer value you will usually get from the debugger.

Also, if you have some old code that uses the string representation
"_00691608_p_A", you can use it now again by calling str(ptr), or
maybe nothing special by just calling PyString_AsString(..).

This change is mainly for nostalgic swig users that miss the
string representation, but also allows to say again

  if a.this == b.this:
    return "a is b"

and well, since the change were really simple, maybe in the future
we will be able to do

    next = a.this + 1

or add native python iteration over native C/C++ arrays, ie, no
need to create/copy new tuples when returning and array or vector.


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@6759 626c5289-ae23-0410-ae9c-e8d60b6d4f22
2004-11-19 20:40:20 +00:00

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/* ------------------------------------------------------------
* The start of the Python initialization function
* ------------------------------------------------------------ */
%init %{
#ifdef __cplusplus
extern "C" {
#endif
/* Python-specific SWIG API */
#define SWIG_newvarlink() SWIG_Python_newvarlink()
#define SWIG_addvarlink(p, name, get_attr, set_attr) SWIG_Python_addvarlink(p, name, get_attr, set_attr)
#define SWIG_InstallConstants(d, constants) SWIG_Python_InstallConstants(d, constants)
/* -----------------------------------------------------------------------------
* global variable support code.
* ----------------------------------------------------------------------------- */
typedef struct swig_globalvar {
char *name; /* Name of global variable */
PyObject *(*get_attr)(); /* Return the current value */
int (*set_attr)(PyObject *); /* Set the value */
struct swig_globalvar *next;
} swig_globalvar;
typedef struct swig_varlinkobject {
PyObject_HEAD
swig_globalvar *vars;
} swig_varlinkobject;
static PyObject *
swig_varlink_repr(swig_varlinkobject *v) {
v = v;
return PyString_FromString("<Global variables>");
}
static int
swig_varlink_print(swig_varlinkobject *v, FILE *fp, int flags) {
swig_globalvar *var;
flags = flags;
fprintf(fp,"Global variables { ");
for (var = v->vars; var; var=var->next) {
fprintf(fp,"%s", var->name);
if (var->next) fprintf(fp,", ");
}
fprintf(fp," }\n");
return 0;
}
static PyObject *
swig_varlink_getattr(swig_varlinkobject *v, char *n) {
swig_globalvar *var = v->vars;
while (var) {
if (strcmp(var->name,n) == 0) {
return (*var->get_attr)();
}
var = var->next;
}
PyErr_SetString(PyExc_NameError,"Unknown C global variable");
return NULL;
}
static int
swig_varlink_setattr(swig_varlinkobject *v, char *n, PyObject *p) {
swig_globalvar *var = v->vars;
while (var) {
if (strcmp(var->name,n) == 0) {
return (*var->set_attr)(p);
}
var = var->next;
}
PyErr_SetString(PyExc_NameError,"Unknown C global variable");
return 1;
}
static PyTypeObject varlinktype = {
PyObject_HEAD_INIT(0)
0, /* Number of items in variable part (ob_size) */
(char *)"swigvarlink", /* Type name (tp_name) */
sizeof(swig_varlinkobject), /* Basic size (tp_basicsize) */
0, /* Itemsize (tp_itemsize) */
0, /* Deallocator (tp_dealloc) */
(printfunc) swig_varlink_print, /* Print (tp_print) */
(getattrfunc) swig_varlink_getattr, /* get attr (tp_getattr) */
(setattrfunc) swig_varlink_setattr, /* Set attr (tp_setattr) */
0, /* tp_compare */
(reprfunc) swig_varlink_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
0, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
#if PY_VERSION_HEX >= 0x02020000
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
#endif
#if PY_VERSION_HEX >= 0x02030000
0, /* tp_del */
#endif
#ifdef COUNT_ALLOCS
/* these must be last */
0, /* tp_alloc */
0, /* tp_free */
0, /* tp_maxalloc */
0, /* tp_next */
#endif
};
/* Create a variable linking object for use later */
static PyObject *
SWIG_Python_newvarlink(void) {
swig_varlinkobject *result = 0;
result = PyMem_NEW(swig_varlinkobject,1);
varlinktype.ob_type = &PyType_Type; /* Patch varlinktype into a PyType */
result->ob_type = &varlinktype;
result->vars = 0;
result->ob_refcnt = 0;
Py_XINCREF((PyObject *) result);
return ((PyObject*) result);
}
static void
SWIG_Python_addvarlink(PyObject *p, char *name, PyObject *(*get_attr)(void), int (*set_attr)(PyObject *p)) {
swig_varlinkobject *v;
swig_globalvar *gv;
v= (swig_varlinkobject *) p;
gv = (swig_globalvar *) malloc(sizeof(swig_globalvar));
gv->name = (char *) malloc(strlen(name)+1);
strcpy(gv->name,name);
gv->get_attr = get_attr;
gv->set_attr = set_attr;
gv->next = v->vars;
v->vars = gv;
}
/* -----------------------------------------------------------------------------
* constants/methods manipulation
* ----------------------------------------------------------------------------- */
/* Install Constants */
static void
SWIG_Python_InstallConstants(PyObject *d, swig_const_info constants[]) {
PyObject *obj = 0;
size_t i;
for (i = 0; constants[i].type; i++) {
switch(constants[i].type) {
case SWIG_PY_INT:
obj = PyInt_FromLong(constants[i].lvalue);
break;
case SWIG_PY_FLOAT:
obj = PyFloat_FromDouble(constants[i].dvalue);
break;
case SWIG_PY_STRING:
if (constants[i].pvalue) {
obj = PyString_FromString((char *) constants[i].pvalue);
} else {
Py_INCREF(Py_None);
obj = Py_None;
}
break;
case SWIG_PY_POINTER:
obj = SWIG_NewPointerObj(constants[i].pvalue, *(constants[i]).ptype,0);
break;
case SWIG_PY_BINARY:
obj = SWIG_NewPackedObj(constants[i].pvalue, constants[i].lvalue, *(constants[i].ptype));
break;
default:
obj = 0;
break;
}
if (obj) {
PyDict_SetItemString(d,constants[i].name,obj);
Py_DECREF(obj);
}
}
}
/* -----------------------------------------------------------------------------*/
/* Fix SwigMethods to carry the callback ptrs when needed */
/* -----------------------------------------------------------------------------*/
static void
SWIG_Python_FixMethods(PyMethodDef *methods,
swig_const_info *const_table,
swig_type_info **types,
swig_type_info **types_initial) {
size_t i;
for (i = 0; methods[i].ml_name; ++i) {
char *c = methods[i].ml_doc;
if (c && (c = strstr(c, "swig_ptr: "))) {
int j;
swig_const_info *ci = 0;
char *name = c + 10;
for (j = 0; const_table[j].type; j++) {
if (strncmp(const_table[j].name, name,
strlen(const_table[j].name)) == 0) {
ci = &(const_table[j]);
break;
}
}
if (ci) {
size_t shift = (ci->ptype) - types;
swig_type_info *ty = types_initial[shift];
size_t ldoc = (c - methods[i].ml_doc);
size_t lptr = strlen(ty->name)+2*sizeof(void*)+2;
char *ndoc = (char*)malloc(ldoc + lptr + 10);
char *buff = ndoc;
void *ptr = (ci->type == SWIG_PY_POINTER) ? ci->pvalue: (void *)(ci->lvalue);
strncpy(buff, methods[i].ml_doc, ldoc);
buff += ldoc;
strncpy(buff, "swig_ptr: ", 10);
buff += 10;
SWIG_PackVoidPtr(buff, ptr, ty->name, lptr);
methods[i].ml_doc = ndoc;
}
}
}
}
/* -----------------------------------------------------------------------------*
* Initialize type list
* -----------------------------------------------------------------------------*/
#if PY_MAJOR_VERSION < 2
/* PyModule_AddObject function was introduced in Python 2.0. The following function
is copied out of Python/modsupport.c in python version 2.3.4 */
static int
PyModule_AddObject(PyObject *m, char *name, PyObject *o)
{
PyObject *dict;
if (!PyModule_Check(m)) {
PyErr_SetString(PyExc_TypeError,
"PyModule_AddObject() needs module as first arg");
return -1;
}
if (!o) {
PyErr_SetString(PyExc_TypeError,
"PyModule_AddObject() needs non-NULL value");
return -1;
}
dict = PyModule_GetDict(m);
if (dict == NULL) {
/* Internal error -- modules must have a dict! */
PyErr_Format(PyExc_SystemError, "module '%s' has no __dict__",
PyModule_GetName(m));
return -1;
}
if (PyDict_SetItemString(dict, name, o))
return -1;
Py_DECREF(o);
return 0;
}
#endif
static swig_type_info **
SWIG_Python_SetTypeListHandle(swig_type_info **type_list_handle) {
static PyMethodDef swig_empty_runtime_method_table[] = { {NULL, NULL, 0, NULL} };/* Sentinel */
PyObject *module = Py_InitModule((char*)"swig_runtime_data" SWIG_RUNTIME_VERSION,
swig_empty_runtime_method_table);
PyObject *pointer = PyCObject_FromVoidPtr((void *) type_list_handle, NULL);
if (pointer && module) {
PyModule_AddObject(module, (char*)"type_pointer" SWIG_TYPE_TABLE_NAME, pointer);
}
return type_list_handle;
}
static swig_type_info **
SWIG_Python_LookupTypePointer(swig_type_info **type_list_handle) {
swig_type_info **type_pointer;
/* first check if module already created */
type_pointer = SWIG_Python_GetTypeListHandle();
if (type_pointer) {
return type_pointer;
} else {
/* create a new module and variable */
return SWIG_Python_SetTypeListHandle(type_list_handle);
}
}
#ifdef __cplusplus
}
#endif
/* -----------------------------------------------------------------------------*
* Partial Init method
* -----------------------------------------------------------------------------*/
#ifdef SWIG_LINK_RUNTIME
#ifdef __cplusplus
extern "C"
#endif
SWIGEXPORT(void *) SWIG_ReturnGlobalTypeList(void *);
#endif
#ifdef __cplusplus
extern "C"
#endif
SWIGEXPORT(void) SWIG_init(void) {
static PyObject *SWIG_globals = 0;
static int typeinit = 0;
PyObject *m, *d;
int i;
if (!SWIG_globals) SWIG_globals = SWIG_newvarlink();
/* Fix SwigMethods to carry the callback ptrs when needed */
SWIG_Python_FixMethods(SwigMethods, swig_const_table, swig_types, swig_types_initial);
m = Py_InitModule((char *) SWIG_name, SwigMethods);
d = PyModule_GetDict(m);
if (!typeinit) {
#ifdef SWIG_LINK_RUNTIME
swig_type_list_handle = (swig_type_info **) SWIG_ReturnGlobalTypeList(swig_type_list_handle);
#else
# ifndef SWIG_STATIC_RUNTIME
swig_type_list_handle = SWIG_Python_LookupTypePointer(swig_type_list_handle);
# endif
#endif
for (i = 0; swig_types_initial[i]; i++) {
swig_types[i] = SWIG_TypeRegister(swig_types_initial[i]);
}
typeinit = 1;
}
SWIG_InstallConstants(d,swig_const_table);
%}
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