Imported Upstream version 3.21.91
[platform/upstream/python-gobject.git] / gi / pygi-foreign.c
1 /* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
2 /*
3  * Copyright (c) 2010  litl, LLC
4  * Copyright (c) 2010  Collabora Ltd. <http://www.collabora.co.uk/>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22  * IN THE SOFTWARE.
23  */
24
25 #ifdef HAVE_CONFIG_H
26 #  include <config.h>
27 #endif
28
29 #include "pygobject-internal.h"
30 #include "pygi-foreign.h"
31
32 #include <girepository.h>
33
34 typedef struct {
35     const char *namespace;
36     const char *name;
37     PyGIArgOverrideToGIArgumentFunc to_func;
38     PyGIArgOverrideFromGIArgumentFunc from_func;
39     PyGIArgOverrideReleaseFunc release_func;
40 } PyGIForeignStruct;
41
42 static GPtrArray *foreign_structs = NULL;
43
44 static void
45 init_foreign_structs (void)
46 {
47     foreign_structs = g_ptr_array_new ();
48 }
49
50 static PyGIForeignStruct *
51 do_lookup (const gchar *namespace, const gchar *name)
52 {
53     gint i;
54     for (i = 0; i < foreign_structs->len; i++) {
55         PyGIForeignStruct *foreign_struct = \
56                 g_ptr_array_index (foreign_structs, i);
57
58         if ( (strcmp (namespace, foreign_struct->namespace) == 0) &&
59                 (strcmp (name, foreign_struct->name) == 0)) {
60             return foreign_struct;
61         }
62     }
63     return NULL;
64 }
65
66 static PyObject *
67 pygi_struct_foreign_load_module (const char *namespace)
68 {
69     gchar *module_name = g_strconcat ("gi._gi_", namespace, NULL);
70     PyObject *module = PyImport_ImportModule (module_name);
71     g_free (module_name);
72     return module;
73 }
74
75 static PyGIForeignStruct *
76 pygi_struct_foreign_lookup_by_name (const char *namespace, const char *name)
77 {
78     PyGIForeignStruct *result;
79
80     result = do_lookup (namespace, name);
81
82     if (result == NULL) {
83         PyObject *module = pygi_struct_foreign_load_module (namespace);
84
85         if (module == NULL)
86             PyErr_Clear ();
87         else {
88             Py_DECREF (module);
89             result = do_lookup (namespace, name);
90         }
91     }
92
93     if (result == NULL) {
94         PyErr_Format (PyExc_TypeError,
95                       "Couldn't find foreign struct converter for '%s.%s'",
96                       namespace,
97                       name);
98     }
99
100     return result;
101 }
102
103 static PyGIForeignStruct *
104 pygi_struct_foreign_lookup (GIBaseInfo *base_info)
105 {
106     const gchar *namespace = g_base_info_get_namespace (base_info);
107     const gchar *name = g_base_info_get_name (base_info);
108
109     return pygi_struct_foreign_lookup_by_name (namespace, name);
110 }
111
112 PyObject *
113 pygi_struct_foreign_convert_to_g_argument (PyObject        *value,
114                                            GIInterfaceInfo *interface_info,
115                                            GITransfer       transfer,
116                                            GIArgument      *arg)
117 {
118     PyObject *result;
119
120     GIBaseInfo *base_info = (GIBaseInfo *) interface_info;
121     PyGIForeignStruct *foreign_struct = pygi_struct_foreign_lookup (base_info);
122
123     if (foreign_struct == NULL) {
124         PyErr_Format(PyExc_KeyError, "could not find foreign type %s",
125                      g_base_info_get_name (base_info));
126         return FALSE;
127     }
128
129     result = foreign_struct->to_func (value, interface_info, transfer, arg);
130     return result;
131 }
132
133 PyObject *
134 pygi_struct_foreign_convert_from_g_argument (GIInterfaceInfo *interface_info,
135                                              GITransfer       transfer,
136                                              GIArgument      *arg)
137 {
138     GIBaseInfo *base_info = (GIBaseInfo *) interface_info;
139     PyGIForeignStruct *foreign_struct = pygi_struct_foreign_lookup (base_info);
140
141     if (foreign_struct == NULL)
142         return NULL;
143
144     return foreign_struct->from_func (interface_info, transfer, arg);
145 }
146
147 PyObject *
148 pygi_struct_foreign_release (GIBaseInfo *base_info,
149                              gpointer    struct_)
150 {
151     PyGIForeignStruct *foreign_struct = pygi_struct_foreign_lookup (base_info);
152
153     if (foreign_struct == NULL)
154         return NULL;
155
156     if (!foreign_struct->release_func)
157         Py_RETURN_NONE;
158
159     return foreign_struct->release_func (base_info, struct_);
160 }
161
162 void
163 pygi_register_foreign_struct (const char* namespace_,
164                               const char* name,
165                               PyGIArgOverrideToGIArgumentFunc to_func,
166                               PyGIArgOverrideFromGIArgumentFunc from_func,
167                               PyGIArgOverrideReleaseFunc release_func)
168 {
169     PyGIForeignStruct *new_struct = g_slice_new (PyGIForeignStruct);
170     new_struct->namespace = namespace_;
171     new_struct->name = name;
172     new_struct->to_func = to_func;
173     new_struct->from_func = from_func;
174     new_struct->release_func = release_func;
175
176     g_ptr_array_add (foreign_structs, new_struct);
177 }
178
179 PyObject *
180 pygi_require_foreign (PyObject *self, PyObject *args, PyObject *kwargs)
181 {
182     static char *kwlist[] = { "namespace", "symbol", NULL };
183     const char *namespace = NULL;
184     const char *symbol = NULL;
185
186     if (!PyArg_ParseTupleAndKeywords (args, kwargs,
187                                       "s|z:require_foreign",
188                                       kwlist, &namespace, &symbol)) {
189         return NULL;
190     }
191
192     if (symbol) {
193         PyGIForeignStruct *foreign;
194         foreign = pygi_struct_foreign_lookup_by_name (namespace, symbol);
195         if (foreign == NULL) {
196             return NULL;
197         }
198     } else {
199         PyObject *module = pygi_struct_foreign_load_module (namespace);
200         if (module) {
201             Py_DECREF (module);
202         } else {
203             return NULL;
204         }
205     }
206
207     Py_RETURN_NONE;
208 }
209
210 void
211 pygi_foreign_init (void)
212 {
213     if (foreign_structs == NULL) {
214         init_foreign_structs ();
215     }
216 }