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/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
/*
* Copyright (c) 2011 Laszlo Pandy <lpandy@src.gnome.org>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "pygi-private.h"
#include "pygi-value.h"
static GISignalInfo *
_pygi_lookup_signal_from_g_type (GType g_type,
const gchar *signal_name)
{
GIRepository *repository;
GIBaseInfo *info;
GISignalInfo *signal_info = NULL;
repository = g_irepository_get_default();
info = g_irepository_find_by_gtype (repository, g_type);
if (info == NULL)
return NULL;
if (GI_IS_OBJECT_INFO (info))
signal_info = g_object_info_find_signal ((GIObjectInfo *) info,
signal_name);
else if (GI_IS_INTERFACE_INFO (info))
signal_info = g_interface_info_find_signal ((GIInterfaceInfo *) info,
signal_name);
g_base_info_unref (info);
return signal_info;
}
static void
pygi_signal_closure_invalidate(gpointer data,
GClosure *closure)
{
PyGClosure *pc = (PyGClosure *)closure;
PyGILState_STATE state;
state = PyGILState_Ensure();
Py_XDECREF(pc->callback);
Py_XDECREF(pc->extra_args);
Py_XDECREF(pc->swap_data);
PyGILState_Release(state);
pc->callback = NULL;
pc->extra_args = NULL;
pc->swap_data = NULL;
g_base_info_unref (((PyGISignalClosure *) pc)->signal_info);
((PyGISignalClosure *) pc)->signal_info = NULL;
}
static void
pygi_signal_closure_marshal(GClosure *closure,
GValue *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
PyGILState_STATE state;
PyGClosure *pc = (PyGClosure *)closure;
PyObject *params, *ret = NULL;
guint i;
GISignalInfo *signal_info;
gint n_sig_info_args;
gint sig_info_highest_arg;
state = PyGILState_Ensure();
signal_info = ((PyGISignalClosure *)closure)->signal_info;
n_sig_info_args = g_callable_info_get_n_args(signal_info);
/* the first argument to a signal callback is instance,
but instance is not counted in the introspection data */
sig_info_highest_arg = n_sig_info_args + 1;
g_assert_cmpint(sig_info_highest_arg, ==, n_param_values);
/* construct Python tuple for the parameter values */
params = PyTuple_New(n_param_values);
for (i = 0; i < n_param_values; i++) {
/* swap in a different initial data for connect_object() */
if (i == 0 && G_CCLOSURE_SWAP_DATA(closure)) {
g_return_if_fail(pc->swap_data != NULL);
Py_INCREF(pc->swap_data);
PyTuple_SetItem(params, 0, pc->swap_data);
} else if (i == 0) {
PyObject *item = pyg_value_as_pyobject(¶m_values[i], FALSE);
if (!item) {
goto out;
}
PyTuple_SetItem(params, i, item);
} else if (i < sig_info_highest_arg) {
GIArgInfo arg_info;
GITypeInfo type_info;
GITransfer transfer;
GIArgument arg = { 0, };
PyObject *item = NULL;
gboolean free_array = FALSE;
g_callable_info_load_arg(signal_info, i - 1, &arg_info);
g_arg_info_load_type(&arg_info, &type_info);
transfer = g_arg_info_get_ownership_transfer(&arg_info);
arg = _pygi_argument_from_g_value(¶m_values[i], &type_info);
if (g_type_info_get_tag (&type_info) == GI_TYPE_TAG_ARRAY) {
/* Skip the self argument of param_values */
arg.v_pointer = _pygi_argument_to_array (&arg, NULL, param_values + 1, signal_info,
&type_info, &free_array);
}
item = _pygi_argument_to_object (&arg, &type_info, transfer);
if (free_array) {
g_array_free (arg.v_pointer, FALSE);
}
if (item == NULL) {
goto out;
}
PyTuple_SetItem(params, i, item);
}
}
/* params passed to function may have extra arguments */
if (pc->extra_args) {
PyObject *tuple = params;
params = PySequence_Concat(tuple, pc->extra_args);
Py_DECREF(tuple);
}
ret = PyObject_CallObject(pc->callback, params);
if (ret == NULL) {
if (pc->exception_handler)
pc->exception_handler(return_value, n_param_values, param_values);
else
PyErr_Print();
goto out;
}
if (G_IS_VALUE(return_value) && pyg_value_from_pyobject(return_value, ret) != 0) {
PyErr_SetString(PyExc_TypeError,
"can't convert return value to desired type");
if (pc->exception_handler)
pc->exception_handler(return_value, n_param_values, param_values);
else
PyErr_Print();
}
Py_DECREF(ret);
out:
Py_DECREF(params);
PyGILState_Release(state);
}
GClosure *
pygi_signal_closure_new_real (PyGObject *instance,
GType g_type,
const gchar *signal_name,
PyObject *callback,
PyObject *extra_args,
PyObject *swap_data)
{
GClosure *closure = NULL;
PyGISignalClosure *pygi_closure = NULL;
GISignalInfo *signal_info = NULL;
g_return_val_if_fail(callback != NULL, NULL);
signal_info = _pygi_lookup_signal_from_g_type (g_type, signal_name);
if (signal_info == NULL)
return NULL;
closure = g_closure_new_simple(sizeof(PyGISignalClosure), NULL);
g_closure_add_invalidate_notifier(closure, NULL, pygi_signal_closure_invalidate);
g_closure_set_marshal(closure, pygi_signal_closure_marshal);
pygi_closure = (PyGISignalClosure *)closure;
pygi_closure->signal_info = signal_info;
Py_INCREF(callback);
pygi_closure->pyg_closure.callback = callback;
if (extra_args != NULL && extra_args != Py_None) {
Py_INCREF(extra_args);
if (!PyTuple_Check(extra_args)) {
PyObject *tmp = PyTuple_New(1);
PyTuple_SetItem(tmp, 0, extra_args);
extra_args = tmp;
}
pygi_closure->pyg_closure.extra_args = extra_args;
}
if (swap_data) {
Py_INCREF(swap_data);
pygi_closure->pyg_closure.swap_data = swap_data;
closure->derivative_flag = TRUE;
}
return closure;
}
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