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/* -*- Mode: C; c-basic-offset: 4 -*-
* pygtk- Python bindings for the GTK toolkit.
* Copyright (C) 1998-2003 James Henstridge
*
* pygpointer.c: wrapper for GPointer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <pyglib.h>
#include "pygobject-private.h"
#include "pygpointer.h"
#include "pygi-external.h"
GQuark pygpointer_class_key;
PYGLIB_DEFINE_TYPE("gobject.GPointer", PyGPointer_Type, PyGPointer);
static void
pyg_pointer_dealloc(PyGPointer *self)
{
Py_TYPE(self)->tp_free((PyObject *)self);
}
static int
pyg_pointer_compare(PyGPointer *self, PyGPointer *v)
{
if (self->pointer == v->pointer) return 0;
if (self->pointer > v->pointer) return -1;
return 1;
}
static long
pyg_pointer_hash(PyGPointer *self)
{
return (long)self->pointer;
}
static PyObject *
pyg_pointer_repr(PyGPointer *self)
{
gchar buf[128];
g_snprintf(buf, sizeof(buf), "<%s at 0x%lx>", g_type_name(self->gtype),
(long)self->pointer);
return _PyUnicode_FromString(buf);
}
static int
pyg_pointer_init(PyGPointer *self, PyObject *args, PyObject *kwargs)
{
gchar buf[512];
if (!PyArg_ParseTuple(args, ":GPointer.__init__"))
return -1;
self->pointer = NULL;
self->gtype = 0;
g_snprintf(buf, sizeof(buf), "%s can not be constructed",
Py_TYPE(self)->tp_name);
PyErr_SetString(PyExc_NotImplementedError, buf);
return -1;
}
static void
pyg_pointer_free(PyObject *op)
{
PyObject_FREE(op);
}
/**
* pyg_register_pointer:
* @dict: the module dictionary to store the wrapper class.
* @class_name: the Python name for the wrapper class.
* @pointer_type: the GType of the pointer type being wrapped.
* @type: the wrapper class.
*
* Registers a wrapper for a pointer type. The wrapper class will be
* a subclass of gobject.GPointer, and a reference to the wrapper
* class will be stored in the provided module dictionary.
*/
void
pyg_register_pointer(PyObject *dict, const gchar *class_name,
GType pointer_type, PyTypeObject *type)
{
PyObject *o;
g_return_if_fail(dict != NULL);
g_return_if_fail(class_name != NULL);
g_return_if_fail(pointer_type != 0);
if (!type->tp_dealloc) type->tp_dealloc = (destructor)pyg_pointer_dealloc;
Py_TYPE(type) = &PyType_Type;
type->tp_base = &PyGPointer_Type;
if (PyType_Ready(type) < 0) {
g_warning("could not get type `%s' ready", type->tp_name);
return;
}
PyDict_SetItemString(type->tp_dict, "__gtype__",
o=pyg_type_wrapper_new(pointer_type));
Py_DECREF(o);
g_type_set_qdata(pointer_type, pygpointer_class_key, type);
PyDict_SetItemString(dict, (char *)class_name, (PyObject *)type);
}
/**
* pyg_pointer_new:
* @pointer_type: the GType of the pointer value.
* @pointer: the pointer value.
*
* Creates a wrapper for a pointer value. Since G_TYPE_POINTER types
* don't register any information about how to copy/free them, there
* is no guarantee that the pointer will remain valid, and there is
* nothing registered to release the pointer when the pointer goes out
* of scope. This is why we don't recommend people use these types.
*
* Returns: the boxed wrapper.
*/
PyObject *
pyg_pointer_new(GType pointer_type, gpointer pointer)
{
PyGILState_STATE state;
PyGPointer *self;
PyTypeObject *tp;
g_return_val_if_fail(pointer_type != 0, NULL);
state = pyglib_gil_state_ensure();
if (!pointer) {
Py_INCREF(Py_None);
pyglib_gil_state_release(state);
return Py_None;
}
tp = g_type_get_qdata(pointer_type, pygpointer_class_key);
if (tp == NULL) {
tp = (PyTypeObject *)pygi_type_import_by_g_type(pointer_type);
if (tp == NULL) {
PyErr_Clear();
}
}
if (!tp)
tp = (PyTypeObject *)&PyGPointer_Type; /* fallback */
self = PyObject_NEW(PyGPointer, tp);
pyglib_gil_state_release(state);
if (self == NULL)
return NULL;
self->pointer = pointer;
self->gtype = pointer_type;
return (PyObject *)self;
}
void
pygobject_pointer_register_types(PyObject *d)
{
pygpointer_class_key = g_quark_from_static_string("PyGPointer::class");
PyGPointer_Type.tp_dealloc = (destructor)pyg_pointer_dealloc;
PyGPointer_Type.tp_compare = (cmpfunc)pyg_pointer_compare;
PyGPointer_Type.tp_repr = (reprfunc)pyg_pointer_repr;
PyGPointer_Type.tp_hash = (hashfunc)pyg_pointer_hash;
PyGPointer_Type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;
PyGPointer_Type.tp_init = (initproc)pyg_pointer_init;
PyGPointer_Type.tp_free = (freefunc)pyg_pointer_free;
PYGOBJECT_REGISTER_GTYPE(d, PyGPointer_Type, "GPointer", G_TYPE_POINTER);
}
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