path: root/gobject/pygboxed.c

/* -*- Mode: C; c-basic-offset: 4 -*-
 * pygtk- Python bindings for the GTK toolkit.
 * Copyright (C) 1998-2003  James Henstridge
 *
 *   pygboxed.c: wrapper for GBoxed
 *
 * 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 "pygboxed.h"

#include "pygi.h"

GQuark pygboxed_type_key;
GQuark pygboxed_marshal_key;

PYGLIB_DEFINE_TYPE("gobject.GBoxed", PyGBoxed_Type, PyGBoxed);

static void
pyg_boxed_dealloc(PyGBoxed *self)
{
    if (self->free_on_dealloc && self->boxed) {
	PyGILState_STATE state = pyglib_gil_state_ensure();
	g_boxed_free(self->gtype, self->boxed);
	pyglib_gil_state_release(state);
    }

    Py_TYPE(self)->tp_free((PyObject *)self);
}

static PyObject*
pyg_boxed_richcompare(PyObject *self, PyObject *other, int op)
{
    if (Py_TYPE(self) == Py_TYPE(other) && Py_TYPE(self) == &PyGBoxed_Type)
        return _pyglib_generic_ptr_richcompare(((PyGBoxed*)self)->boxed,
                                               ((PyGBoxed*)other)->boxed,
                                               op);
    else {
        Py_INCREF(Py_NotImplemented);
        return Py_NotImplemented;
    }
}


static long
pyg_boxed_hash(PyGBoxed *self)
{
    return (long)self->boxed;
}

static PyObject *
pyg_boxed_repr(PyGBoxed *self)
{
    gchar buf[128];

    g_snprintf(buf, sizeof(buf), "<%s at 0x%lx>", g_type_name(self->gtype),
	       (long)self->boxed);
    return PYGLIB_PyUnicode_FromString(buf);
}

static int
pyg_boxed_init(PyGBoxed *self, PyObject *args, PyObject *kwargs)
{
    gchar buf[512];

    if (!PyArg_ParseTuple(args, ":GBoxed.__init__"))
	return -1;

    self->boxed = NULL;
    self->gtype = 0;
    self->free_on_dealloc = FALSE;

    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_boxed_free(PyObject *op)
{
  PyObject_FREE(op);
}

static PyObject *
pyg_boxed_copy(PyGBoxed *self)
{
    return pyg_boxed_new (self->gtype, self->boxed, TRUE, TRUE);
}



static PyMethodDef pygboxed_methods[] = {
    { "copy", (PyCFunction) pyg_boxed_copy, METH_NOARGS },
    { NULL, NULL, 0 }
};


/**
 * pyg_register_boxed:
 * @dict: the module dictionary to store the wrapper class.
 * @class_name: the Python name for the wrapper class.
 * @boxed_type: the GType of the boxed type being wrapped.
 * @type: the wrapper class.
 *
 * Registers a wrapper for a boxed type.  The wrapper class will be a
 * subclass of gobject.GBoxed, and a reference to the wrapper class
 * will be stored in the provided module dictionary.
 */
void
pyg_register_boxed(PyObject *dict, const gchar *class_name,
		   GType boxed_type, PyTypeObject *type)
{
    PyObject *o;

    g_return_if_fail(dict != NULL);
    g_return_if_fail(class_name != NULL);
    g_return_if_fail(boxed_type != 0);

    if (!type->tp_dealloc)  type->tp_dealloc  = (destructor)pyg_boxed_dealloc;

    Py_TYPE(type) = &PyType_Type;
    type->tp_base = &PyGBoxed_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(boxed_type));
    Py_DECREF(o);

    g_type_set_qdata(boxed_type, pygboxed_type_key, type);

    PyDict_SetItemString(dict, (char *)class_name, (PyObject *)type);
}

/**
 * pyg_boxed_new:
 * @boxed_type: the GType of the boxed value.
 * @boxed: the boxed value.
 * @copy_boxed: whether the new boxed wrapper should hold a copy of the value.
 * @own_ref: whether the boxed wrapper should own the boxed value.
 *
 * Creates a wrapper for a boxed value.  If @copy_boxed is set to
 * True, the wrapper will hold a copy of the value, instead of the
 * value itself.  If @own_ref is True, then the value held by the
 * wrapper will be freed when the wrapper is deallocated.  If
 * @copy_boxed is True, then @own_ref must also be True.
 *
 * Returns: the boxed wrapper.
 */
PyObject *
pyg_boxed_new(GType boxed_type, gpointer boxed, gboolean copy_boxed,
	      gboolean own_ref)
{
    PyGILState_STATE state;
    PyGBoxed *self;
    PyTypeObject *tp;

    g_return_val_if_fail(boxed_type != 0, NULL);
    g_return_val_if_fail(!copy_boxed || (copy_boxed && own_ref), NULL);

    state = pyglib_gil_state_ensure();

    if (!boxed) {
	Py_INCREF(Py_None);
	pyglib_gil_state_release(state);
	return Py_None;
    }

    tp = g_type_get_qdata(boxed_type, pygboxed_type_key);

    if (!tp)
        tp = (PyTypeObject *)pygi_type_import_by_g_type(boxed_type);

    if (!tp)
	tp = (PyTypeObject *)&PyGBoxed_Type; /* fallback */

    self = (PyGBoxed *)tp->tp_alloc(tp, 0);

    if (self == NULL) {
	pyglib_gil_state_release(state);
        return NULL;
    }

    if (copy_boxed)
	boxed = g_boxed_copy(boxed_type, boxed);
    self->boxed = boxed;
    self->gtype = boxed_type;
    self->free_on_dealloc = own_ref;

    pyglib_gil_state_release(state);
    
    return (PyObject *)self;
}

void
pygobject_boxed_register_types(PyObject *d)
{
    pygboxed_type_key        = g_quark_from_static_string("PyGBoxed::class");
    pygboxed_marshal_key     = g_quark_from_static_string("PyGBoxed::marshal");

    PyGBoxed_Type.tp_dealloc = (destructor)pyg_boxed_dealloc;
    PyGBoxed_Type.tp_richcompare = pyg_boxed_richcompare;
    PyGBoxed_Type.tp_repr = (reprfunc)pyg_boxed_repr;
    PyGBoxed_Type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;
    PyGBoxed_Type.tp_methods = pygboxed_methods;
    PyGBoxed_Type.tp_init = (initproc)pyg_boxed_init;
    PyGBoxed_Type.tp_free = (freefunc)pyg_boxed_free;
    PyGBoxed_Type.tp_hash = (hashfunc)pyg_boxed_hash;
    
    PYGOBJECT_REGISTER_GTYPE(d, PyGBoxed_Type, "GBoxed", G_TYPE_BOXED);
}