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/* -*- Mode: C; c-basic-offset: 4 -*-
* vim: tabstop=4 shiftwidth=4 expandtab
*
* pygi-callbacks.c: PyGI C Callback Functions and Helpers
*
* 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
*/
#include "pygi-private.h"
static PyGICClosure *global_destroy_notify;
static void
_pygi_destroy_notify_callback_closure (ffi_cif *cif,
void *result,
void **args,
void *data)
{
PyGICClosure *info = * (void**) (args[0]);
g_assert (info);
_pygi_invoke_closure_free (info);
}
PyGICClosure*
_pygi_destroy_notify_create (void)
{
if (!global_destroy_notify) {
PyGICClosure *destroy_notify = g_slice_new0 (PyGICClosure);
g_assert (destroy_notify);
GIBaseInfo* glib_destroy_notify = g_irepository_find_by_name (NULL, "GLib", "DestroyNotify");
g_assert (glib_destroy_notify != NULL);
g_assert (g_base_info_get_type (glib_destroy_notify) == GI_INFO_TYPE_CALLBACK);
destroy_notify->closure = g_callable_info_prepare_closure ( (GICallableInfo*) glib_destroy_notify,
&destroy_notify->cif,
_pygi_destroy_notify_callback_closure,
NULL);
global_destroy_notify = destroy_notify;
}
return global_destroy_notify;
}
gboolean
_pygi_scan_for_callbacks (GIFunctionInfo *function_info,
gboolean is_method,
guint8 *callback_index,
guint8 *user_data_index,
guint8 *destroy_notify_index)
{
guint i, n_args;
*callback_index = G_MAXUINT8;
*user_data_index = G_MAXUINT8;
*destroy_notify_index = G_MAXUINT8;
n_args = g_callable_info_get_n_args ( (GICallableInfo *) function_info);
for (i = 0; i < n_args; i++) {
GIDirection direction;
GIArgInfo *arg_info;
GITypeInfo *type_info;
guint8 destroy, closure;
GITypeTag type_tag;
arg_info = g_callable_info_get_arg ( (GICallableInfo*) function_info, i);
type_info = g_arg_info_get_type (arg_info);
type_tag = g_type_info_get_tag (type_info);
if (type_tag == GI_TYPE_TAG_INTERFACE) {
GIBaseInfo* interface_info;
GIInfoType interface_type;
interface_info = g_type_info_get_interface (type_info);
interface_type = g_base_info_get_type (interface_info);
if (interface_type == GI_INFO_TYPE_CALLBACK &&
! (strcmp (g_base_info_get_namespace ( (GIBaseInfo*) interface_info), "GLib") == 0 &&
(strcmp (g_base_info_get_name ( (GIBaseInfo*) interface_info), "DestroyNotify") == 0 ||
(strcmp (g_base_info_get_name ( (GIBaseInfo*) interface_info), "FreeFunc") == 0)))) {
if (*callback_index != G_MAXUINT8) {
PyErr_Format (PyExc_TypeError, "Function %s.%s has multiple callbacks, not supported",
g_base_info_get_namespace ( (GIBaseInfo*) function_info),
g_base_info_get_name ( (GIBaseInfo*) function_info));
g_base_info_unref (interface_info);
return FALSE;
}
*callback_index = i;
}
g_base_info_unref (interface_info);
}
destroy = g_arg_info_get_destroy (arg_info);
closure = g_arg_info_get_closure (arg_info);
direction = g_arg_info_get_direction (arg_info);
if (destroy > 0 && destroy < n_args) {
if (*destroy_notify_index != G_MAXUINT8) {
PyErr_Format (PyExc_TypeError, "Function %s has multiple GDestroyNotify, not supported",
g_base_info_get_name ( (GIBaseInfo*) function_info));
return FALSE;
}
*destroy_notify_index = destroy;
}
if (closure > 0 && closure < n_args) {
if (*user_data_index != G_MAXUINT8) {
PyErr_Format (PyExc_TypeError, "Function %s has multiple user_data arguments, not supported",
g_base_info_get_name ( (GIBaseInfo*) function_info));
return FALSE;
}
*user_data_index = closure;
}
g_base_info_unref ( (GIBaseInfo*) arg_info);
g_base_info_unref ( (GIBaseInfo*) type_info);
}
return TRUE;
}
gboolean
_pygi_create_callback (GIBaseInfo *function_info,
gboolean is_method,
gboolean is_constructor,
int n_args,
Py_ssize_t py_argc,
PyObject *py_argv,
guint8 callback_index,
guint8 user_data_index,
guint8 destroy_notify_index,
PyGICClosure **closure_out)
{
GIArgInfo *callback_arg;
GITypeInfo *callback_type;
GICallbackInfo *callback_info;
GIScopeType scope;
gboolean found_py_function;
PyObject *py_function;
guint8 i, py_argv_pos;
PyObject *py_user_data;
gboolean allow_none;
callback_arg = g_callable_info_get_arg ( (GICallableInfo*) function_info, callback_index);
scope = g_arg_info_get_scope (callback_arg);
allow_none = g_arg_info_may_be_null (callback_arg);
callback_type = g_arg_info_get_type (callback_arg);
g_assert (g_type_info_get_tag (callback_type) == GI_TYPE_TAG_INTERFACE);
callback_info = (GICallbackInfo*) g_type_info_get_interface (callback_type);
g_assert (g_base_info_get_type ( (GIBaseInfo*) callback_info) == GI_INFO_TYPE_CALLBACK);
/* Find the Python function passed for the callback */
found_py_function = FALSE;
py_function = Py_None;
py_user_data = NULL;
/* if its a method then we need to skip over 'self' */
if (is_method || is_constructor)
py_argv_pos = 1;
else
py_argv_pos = 0;
for (i = 0; i < n_args && i < py_argc; i++) {
if (i == callback_index) {
py_function = PyTuple_GetItem (py_argv, py_argv_pos);
/* if we allow none then set the closure to NULL and return */
if (allow_none && py_function == Py_None) {
*closure_out = NULL;
goto out;
}
found_py_function = TRUE;
} else if (i == user_data_index) {
py_user_data = PyTuple_GetItem (py_argv, py_argv_pos);
}
py_argv_pos++;
}
if (!found_py_function
|| (py_function == Py_None || !PyCallable_Check (py_function))) {
PyErr_Format (PyExc_TypeError, "Error invoking %s.%s: Unexpected value "
"for argument '%s'",
g_base_info_get_namespace ( (GIBaseInfo*) function_info),
g_base_info_get_name ( (GIBaseInfo*) function_info),
g_base_info_get_name ( (GIBaseInfo*) callback_arg));
g_base_info_unref ( (GIBaseInfo*) callback_info);
g_base_info_unref ( (GIBaseInfo*) callback_type);
return FALSE;
}
/** Now actually build the closure **/
*closure_out = _pygi_make_native_closure ( (GICallableInfo *) callback_info,
g_arg_info_get_scope (callback_arg),
py_function,
py_user_data);
out:
g_base_info_unref ( (GIBaseInfo*) callback_info);
g_base_info_unref ( (GIBaseInfo*) callback_type);
return TRUE;
}
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