File: gmenu.c

package info (click to toggle)
glib2.0 2.58.3-2%2Bdeb10u2
  • links: PTS, VCS
  • area: main
  • in suites: buster, buster-backports
  • size: 48,956 kB
  • sloc: ansic: 452,656; xml: 16,781; python: 6,149; makefile: 3,776; sh: 1,499; perl: 1,140; cpp: 9
file content (1388 lines) | stat: -rw-r--r-- 38,397 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
/*
 * Copyright © 2011 Canonical Ltd.
 *
 * 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/>.
 *
 * Author: Ryan Lortie <desrt@desrt.ca>
 */

#include "config.h"

#include "gmenu.h"

#include "gaction.h"
#include <string.h>

#include "gicon.h"

/**
 * SECTION:gmenu
 * @title: GMenu
 * @short_description: A simple implementation of GMenuModel
 * @include: gio/gio.h
 *
 * #GMenu is a simple implementation of #GMenuModel.
 * You populate a #GMenu by adding #GMenuItem instances to it.
 *
 * There are some convenience functions to allow you to directly
 * add items (avoiding #GMenuItem) for the common cases. To add
 * a regular item, use g_menu_insert(). To add a section, use
 * g_menu_insert_section(). To add a submenu, use
 * g_menu_insert_submenu().
 */

/**
 * GMenu:
 *
 * #GMenu is an opaque structure type.  You must access it using the
 * functions below.
 *
 * Since: 2.32
 */

/**
 * GMenuItem:
 *
 * #GMenuItem is an opaque structure type.  You must access it using the
 * functions below.
 *
 * Since: 2.32
 */

struct _GMenuItem
{
  GObject parent_instance;

  GHashTable *attributes;
  GHashTable *links;
  gboolean    cow;
};

typedef GObjectClass GMenuItemClass;

struct _GMenu
{
  GMenuModel parent_instance;

  GArray   *items;
  gboolean  mutable;
};

typedef GMenuModelClass GMenuClass;

G_DEFINE_TYPE (GMenu, g_menu, G_TYPE_MENU_MODEL)
G_DEFINE_TYPE (GMenuItem, g_menu_item, G_TYPE_OBJECT)

struct item
{
  GHashTable *attributes;
  GHashTable *links;
};

static gboolean
g_menu_is_mutable (GMenuModel *model)
{
  GMenu *menu = G_MENU (model);

  return menu->mutable;
}

static gint
g_menu_get_n_items (GMenuModel *model)
{
  GMenu *menu = G_MENU (model);

  return menu->items->len;
}

static void
g_menu_get_item_attributes (GMenuModel  *model,
                            gint         position,
                            GHashTable **table)
{
  GMenu *menu = G_MENU (model);

  *table = g_hash_table_ref (g_array_index (menu->items, struct item, position).attributes);
}

static void
g_menu_get_item_links (GMenuModel  *model,
                       gint         position,
                       GHashTable **table)
{
  GMenu *menu = G_MENU (model);

  *table = g_hash_table_ref (g_array_index (menu->items, struct item, position).links);
}

/**
 * g_menu_insert_item:
 * @menu: a #GMenu
 * @position: the position at which to insert the item
 * @item: the #GMenuItem to insert
 *
 * Inserts @item into @menu.
 *
 * The "insertion" is actually done by copying all of the attribute and
 * link values of @item and using them to form a new item within @menu.
 * As such, @item itself is not really inserted, but rather, a menu item
 * that is exactly the same as the one presently described by @item.
 *
 * This means that @item is essentially useless after the insertion
 * occurs.  Any changes you make to it are ignored unless it is inserted
 * again (at which point its updated values will be copied).
 *
 * You should probably just free @item once you're done.
 *
 * There are many convenience functions to take care of common cases.
 * See g_menu_insert(), g_menu_insert_section() and
 * g_menu_insert_submenu() as well as "prepend" and "append" variants of
 * each of these functions.
 *
 * Since: 2.32
 */
void
g_menu_insert_item (GMenu     *menu,
                    gint       position,
                    GMenuItem *item)
{
  struct item new_item;

  g_return_if_fail (G_IS_MENU (menu));
  g_return_if_fail (G_IS_MENU_ITEM (item));

  if (position < 0 || position > menu->items->len)
    position = menu->items->len;

  new_item.attributes = g_hash_table_ref (item->attributes);
  new_item.links = g_hash_table_ref (item->links);
  item->cow = TRUE;

  g_array_insert_val (menu->items, position, new_item);
  g_menu_model_items_changed (G_MENU_MODEL (menu), position, 0, 1);
}

/**
 * g_menu_prepend_item:
 * @menu: a #GMenu
 * @item: a #GMenuItem to prepend
 *
 * Prepends @item to the start of @menu.
 *
 * See g_menu_insert_item() for more information.
 *
 * Since: 2.32
 */
void
g_menu_prepend_item (GMenu     *menu,
                     GMenuItem *item)
{
  g_menu_insert_item (menu, 0, item);
}

/**
 * g_menu_append_item:
 * @menu: a #GMenu
 * @item: a #GMenuItem to append
 *
 * Appends @item to the end of @menu.
 *
 * See g_menu_insert_item() for more information.
 *
 * Since: 2.32
 */
void
g_menu_append_item (GMenu     *menu,
                    GMenuItem *item)
{
  g_menu_insert_item (menu, -1, item);
}

/**
 * g_menu_freeze:
 * @menu: a #GMenu
 *
 * Marks @menu as frozen.
 *
 * After the menu is frozen, it is an error to attempt to make any
 * changes to it.  In effect this means that the #GMenu API must no
 * longer be used.
 *
 * This function causes g_menu_model_is_mutable() to begin returning
 * %FALSE, which has some positive performance implications.
 *
 * Since: 2.32
 */
void
g_menu_freeze (GMenu *menu)
{
  g_return_if_fail (G_IS_MENU (menu));

  menu->mutable = FALSE;
}

/**
 * g_menu_new:
 *
 * Creates a new #GMenu.
 *
 * The new menu has no items.
 *
 * Returns: a new #GMenu
 *
 * Since: 2.32
 */
GMenu *
g_menu_new (void)
{
  return g_object_new (G_TYPE_MENU, NULL);
}

/**
 * g_menu_insert:
 * @menu: a #GMenu
 * @position: the position at which to insert the item
 * @label: (nullable): the section label, or %NULL
 * @detailed_action: (nullable): the detailed action string, or %NULL
 *
 * Convenience function for inserting a normal menu item into @menu.
 * Combine g_menu_item_new() and g_menu_insert_item() for a more flexible
 * alternative.
 *
 * Since: 2.32
 */
void
g_menu_insert (GMenu       *menu,
               gint         position,
               const gchar *label,
               const gchar *detailed_action)
{
  GMenuItem *menu_item;

  menu_item = g_menu_item_new (label, detailed_action);
  g_menu_insert_item (menu, position, menu_item);
  g_object_unref (menu_item);
}

/**
 * g_menu_prepend:
 * @menu: a #GMenu
 * @label: (nullable): the section label, or %NULL
 * @detailed_action: (nullable): the detailed action string, or %NULL
 *
 * Convenience function for prepending a normal menu item to the start
 * of @menu.  Combine g_menu_item_new() and g_menu_insert_item() for a more
 * flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_prepend (GMenu       *menu,
                const gchar *label,
                const gchar *detailed_action)
{
  g_menu_insert (menu, 0, label, detailed_action);
}

/**
 * g_menu_append:
 * @menu: a #GMenu
 * @label: (nullable): the section label, or %NULL
 * @detailed_action: (nullable): the detailed action string, or %NULL
 *
 * Convenience function for appending a normal menu item to the end of
 * @menu.  Combine g_menu_item_new() and g_menu_insert_item() for a more
 * flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_append (GMenu       *menu,
               const gchar *label,
               const gchar *detailed_action)
{
  g_menu_insert (menu, -1, label, detailed_action);
}

/**
 * g_menu_insert_section:
 * @menu: a #GMenu
 * @position: the position at which to insert the item
 * @label: (nullable): the section label, or %NULL
 * @section: a #GMenuModel with the items of the section
 *
 * Convenience function for inserting a section menu item into @menu.
 * Combine g_menu_item_new_section() and g_menu_insert_item() for a more
 * flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_insert_section (GMenu       *menu,
                       gint         position,
                       const gchar *label,
                       GMenuModel  *section)
{
  GMenuItem *menu_item;

  menu_item = g_menu_item_new_section (label, section);
  g_menu_insert_item (menu, position, menu_item);
  g_object_unref (menu_item);
}


/**
 * g_menu_prepend_section:
 * @menu: a #GMenu
 * @label: (nullable): the section label, or %NULL
 * @section: a #GMenuModel with the items of the section
 *
 * Convenience function for prepending a section menu item to the start
 * of @menu.  Combine g_menu_item_new_section() and g_menu_insert_item() for
 * a more flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_prepend_section (GMenu       *menu,
                        const gchar *label,
                        GMenuModel  *section)
{
  g_menu_insert_section (menu, 0, label, section);
}

/**
 * g_menu_append_section:
 * @menu: a #GMenu
 * @label: (nullable): the section label, or %NULL
 * @section: a #GMenuModel with the items of the section
 *
 * Convenience function for appending a section menu item to the end of
 * @menu.  Combine g_menu_item_new_section() and g_menu_insert_item() for a
 * more flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_append_section (GMenu       *menu,
                       const gchar *label,
                       GMenuModel  *section)
{
  g_menu_insert_section (menu, -1, label, section);
}

/**
 * g_menu_insert_submenu:
 * @menu: a #GMenu
 * @position: the position at which to insert the item
 * @label: (nullable): the section label, or %NULL
 * @submenu: a #GMenuModel with the items of the submenu
 *
 * Convenience function for inserting a submenu menu item into @menu.
 * Combine g_menu_item_new_submenu() and g_menu_insert_item() for a more
 * flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_insert_submenu (GMenu       *menu,
                       gint         position,
                       const gchar *label,
                       GMenuModel  *submenu)
{
  GMenuItem *menu_item;

  menu_item = g_menu_item_new_submenu (label, submenu);
  g_menu_insert_item (menu, position, menu_item);
  g_object_unref (menu_item);
}

/**
 * g_menu_prepend_submenu:
 * @menu: a #GMenu
 * @label: (nullable): the section label, or %NULL
 * @submenu: a #GMenuModel with the items of the submenu
 *
 * Convenience function for prepending a submenu menu item to the start
 * of @menu.  Combine g_menu_item_new_submenu() and g_menu_insert_item() for
 * a more flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_prepend_submenu (GMenu       *menu,
                        const gchar *label,
                        GMenuModel  *submenu)
{
  g_menu_insert_submenu (menu, 0, label, submenu);
}

/**
 * g_menu_append_submenu:
 * @menu: a #GMenu
 * @label: (nullable): the section label, or %NULL
 * @submenu: a #GMenuModel with the items of the submenu
 *
 * Convenience function for appending a submenu menu item to the end of
 * @menu.  Combine g_menu_item_new_submenu() and g_menu_insert_item() for a
 * more flexible alternative.
 *
 * Since: 2.32
 */
void
g_menu_append_submenu (GMenu       *menu,
                       const gchar *label,
                       GMenuModel  *submenu)
{
  g_menu_insert_submenu (menu, -1, label, submenu);
}

static void
g_menu_clear_item (struct item *item)
{
  if (item->attributes != NULL)
    g_hash_table_unref (item->attributes);
  if (item->links != NULL)
    g_hash_table_unref (item->links);
}

/**
 * g_menu_remove:
 * @menu: a #GMenu
 * @position: the position of the item to remove
 *
 * Removes an item from the menu.
 *
 * @position gives the index of the item to remove.
 *
 * It is an error if position is not in range the range from 0 to one
 * less than the number of items in the menu.
 *
 * It is not possible to remove items by identity since items are added
 * to the menu simply by copying their links and attributes (ie:
 * identity of the item itself is not preserved).
 *
 * Since: 2.32
 */
void
g_menu_remove (GMenu *menu,
               gint   position)
{
  g_return_if_fail (G_IS_MENU (menu));
  g_return_if_fail (0 <= position && position < menu->items->len);

  g_menu_clear_item (&g_array_index (menu->items, struct item, position));
  g_array_remove_index (menu->items, position);
  g_menu_model_items_changed (G_MENU_MODEL (menu), position, 1, 0);
}

/**
 * g_menu_remove_all:
 * @menu: a #GMenu
 *
 * Removes all items in the menu.
 *
 * Since: 2.38
 **/
void
g_menu_remove_all (GMenu *menu)
{
  gint i, n;

  g_return_if_fail (G_IS_MENU (menu));
  n = menu->items->len;

  for (i = 0; i < n; i++)
    g_menu_clear_item (&g_array_index (menu->items, struct item, i));
  g_array_set_size (menu->items, 0);

  g_menu_model_items_changed (G_MENU_MODEL (menu), 0, n, 0);
}

static void
g_menu_finalize (GObject *object)
{
  GMenu *menu = G_MENU (object);
  struct item *items;
  gint n_items;
  gint i;

  n_items = menu->items->len;
  items = (struct item *) g_array_free (menu->items, FALSE);
  for (i = 0; i < n_items; i++)
    g_menu_clear_item (&items[i]);
  g_free (items);

  G_OBJECT_CLASS (g_menu_parent_class)
    ->finalize (object);
}

static void
g_menu_init (GMenu *menu)
{
  menu->items = g_array_new (FALSE, FALSE, sizeof (struct item));
  menu->mutable = TRUE;
}

static void
g_menu_class_init (GMenuClass *class)
{
  GMenuModelClass *model_class = G_MENU_MODEL_CLASS (class);
  GObjectClass *object_class = G_OBJECT_CLASS (class);

  object_class->finalize = g_menu_finalize;

  model_class->is_mutable = g_menu_is_mutable;
  model_class->get_n_items = g_menu_get_n_items;
  model_class->get_item_attributes = g_menu_get_item_attributes;
  model_class->get_item_links = g_menu_get_item_links;
}


static void
g_menu_item_clear_cow (GMenuItem *menu_item)
{
  if (menu_item->cow)
    {
      GHashTableIter iter;
      GHashTable *new;
      gpointer key;
      gpointer val;

      new = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref);
      g_hash_table_iter_init (&iter, menu_item->attributes);
      while (g_hash_table_iter_next (&iter, &key, &val))
        g_hash_table_insert (new, g_strdup (key), g_variant_ref (val));
      g_hash_table_unref (menu_item->attributes);
      menu_item->attributes = new;

      new = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_object_unref);
      g_hash_table_iter_init (&iter, menu_item->links);
      while (g_hash_table_iter_next (&iter, &key, &val))
        g_hash_table_insert (new, g_strdup (key), g_object_ref (val));
      g_hash_table_unref (menu_item->links);
      menu_item->links = new;

      menu_item->cow = FALSE;
    }
}

static void
g_menu_item_finalize (GObject *object)
{
  GMenuItem *menu_item = G_MENU_ITEM (object);

  g_hash_table_unref (menu_item->attributes);
  g_hash_table_unref (menu_item->links);

  G_OBJECT_CLASS (g_menu_item_parent_class)
    ->finalize (object);
}

static void
g_menu_item_init (GMenuItem *menu_item)
{
  menu_item->attributes = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref);
  menu_item->links = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
  menu_item->cow = FALSE;
}

static void
g_menu_item_class_init (GMenuItemClass *class)
{
  class->finalize = g_menu_item_finalize;
}

/* We treat attribute names the same as GSettings keys:
 * - only lowercase ascii, digits and '-'
 * - must start with lowercase
 * - must not end with '-'
 * - no consecutive '-'
 * - not longer than 1024 chars
 */
static gboolean
valid_attribute_name (const gchar *name)
{
  gint i;

  if (!g_ascii_islower (name[0]))
    return FALSE;

  for (i = 1; name[i]; i++)
    {
      if (name[i] != '-' &&
          !g_ascii_islower (name[i]) &&
          !g_ascii_isdigit (name[i]))
        return FALSE;

      if (name[i] == '-' && name[i + 1] == '-')
        return FALSE;
    }

  if (name[i - 1] == '-')
    return FALSE;

  if (i > 1024)
    return FALSE;

  return TRUE;
}

/**
 * g_menu_item_set_attribute_value:
 * @menu_item: a #GMenuItem
 * @attribute: the attribute to set
 * @value: (nullable): a #GVariant to use as the value, or %NULL
 *
 * Sets or unsets an attribute on @menu_item.
 *
 * The attribute to set or unset is specified by @attribute. This
 * can be one of the standard attribute names %G_MENU_ATTRIBUTE_LABEL,
 * %G_MENU_ATTRIBUTE_ACTION, %G_MENU_ATTRIBUTE_TARGET, or a custom
 * attribute name.
 * Attribute names are restricted to lowercase characters, numbers
 * and '-'. Furthermore, the names must begin with a lowercase character,
 * must not end with a '-', and must not contain consecutive dashes.
 *
 * must consist only of lowercase
 * ASCII characters, digits and '-'.
 *
 * If @value is non-%NULL then it is used as the new value for the
 * attribute.  If @value is %NULL then the attribute is unset. If
 * the @value #GVariant is floating, it is consumed.
 *
 * See also g_menu_item_set_attribute() for a more convenient way to do
 * the same.
 *
 * Since: 2.32
 */
void
g_menu_item_set_attribute_value (GMenuItem   *menu_item,
                                 const gchar *attribute,
                                 GVariant    *value)
{
  g_return_if_fail (G_IS_MENU_ITEM (menu_item));
  g_return_if_fail (attribute != NULL);
  g_return_if_fail (valid_attribute_name (attribute));

  g_menu_item_clear_cow (menu_item);

  if (value != NULL)
    g_hash_table_insert (menu_item->attributes, g_strdup (attribute), g_variant_ref_sink (value));
  else
    g_hash_table_remove (menu_item->attributes, attribute);
}

/**
 * g_menu_item_set_attribute:
 * @menu_item: a #GMenuItem
 * @attribute: the attribute to set
 * @format_string: (nullable): a #GVariant format string, or %NULL
 * @...: positional parameters, as per @format_string
 *
 * Sets or unsets an attribute on @menu_item.
 *
 * The attribute to set or unset is specified by @attribute. This
 * can be one of the standard attribute names %G_MENU_ATTRIBUTE_LABEL,
 * %G_MENU_ATTRIBUTE_ACTION, %G_MENU_ATTRIBUTE_TARGET, or a custom
 * attribute name.
 * Attribute names are restricted to lowercase characters, numbers
 * and '-'. Furthermore, the names must begin with a lowercase character,
 * must not end with a '-', and must not contain consecutive dashes.
 *
 * If @format_string is non-%NULL then the proper position parameters
 * are collected to create a #GVariant instance to use as the attribute
 * value.  If it is %NULL then the positional parameterrs are ignored
 * and the named attribute is unset.
 *
 * See also g_menu_item_set_attribute_value() for an equivalent call
 * that directly accepts a #GVariant.
 *
 * Since: 2.32
 */
void
g_menu_item_set_attribute (GMenuItem   *menu_item,
                           const gchar *attribute,
                           const gchar *format_string,
                           ...)
{
  GVariant *value;

  if (format_string != NULL)
    {
      va_list ap;

      va_start (ap, format_string);
      value = g_variant_new_va (format_string, NULL, &ap);
      va_end (ap);
    }
  else
    value = NULL;

  g_menu_item_set_attribute_value (menu_item, attribute, value);
}

/**
 * g_menu_item_set_link:
 * @menu_item: a #GMenuItem
 * @link: type of link to establish or unset
 * @model: (nullable): the #GMenuModel to link to (or %NULL to unset)
 *
 * Creates a link from @menu_item to @model if non-%NULL, or unsets it.
 *
 * Links are used to establish a relationship between a particular menu
 * item and another menu.  For example, %G_MENU_LINK_SUBMENU is used to
 * associate a submenu with a particular menu item, and %G_MENU_LINK_SECTION
 * is used to create a section. Other types of link can be used, but there
 * is no guarantee that clients will be able to make sense of them.
 * Link types are restricted to lowercase characters, numbers
 * and '-'. Furthermore, the names must begin with a lowercase character,
 * must not end with a '-', and must not contain consecutive dashes.
 *
 * Since: 2.32
 */
void
g_menu_item_set_link (GMenuItem   *menu_item,
                      const gchar *link,
                      GMenuModel  *model)
{
  g_return_if_fail (G_IS_MENU_ITEM (menu_item));
  g_return_if_fail (link != NULL);
  g_return_if_fail (valid_attribute_name (link));

  g_menu_item_clear_cow (menu_item);

  if (model != NULL)
    g_hash_table_insert (menu_item->links, g_strdup (link), g_object_ref (model));
  else
    g_hash_table_remove (menu_item->links, link);
}

/**
 * g_menu_item_get_attribute_value:
 * @menu_item: a #GMenuItem
 * @attribute: the attribute name to query
 * @expected_type: (nullable): the expected type of the attribute
 *
 * Queries the named @attribute on @menu_item.
 *
 * If @expected_type is specified and the attribute does not have this
 * type, %NULL is returned.  %NULL is also returned if the attribute
 * simply does not exist.
 *
 * Returns: (transfer full): the attribute value, or %NULL
 *
 * Since: 2.34
 */
GVariant *
g_menu_item_get_attribute_value (GMenuItem          *menu_item,
                                 const gchar        *attribute,
                                 const GVariantType *expected_type)
{
  GVariant *value;

  g_return_val_if_fail (G_IS_MENU_ITEM (menu_item), NULL);
  g_return_val_if_fail (attribute != NULL, NULL);

  value = g_hash_table_lookup (menu_item->attributes, attribute);

  if (value != NULL)
    {
      if (expected_type == NULL || g_variant_is_of_type (value, expected_type))
        g_variant_ref (value);
      else
        value = NULL;
    }

  return value;
}

/**
 * g_menu_item_get_attribute:
 * @menu_item: a #GMenuItem
 * @attribute: the attribute name to query
 * @format_string: a #GVariant format string
 * @...: positional parameters, as per @format_string
 *
 * Queries the named @attribute on @menu_item.
 *
 * If the attribute exists and matches the #GVariantType corresponding
 * to @format_string then @format_string is used to deconstruct the
 * value into the positional parameters and %TRUE is returned.
 *
 * If the attribute does not exist, or it does exist but has the wrong
 * type, then the positional parameters are ignored and %FALSE is
 * returned.
 *
 * Returns: %TRUE if the named attribute was found with the expected
 *     type
 *
 * Since: 2.34
 */
gboolean
g_menu_item_get_attribute (GMenuItem   *menu_item,
                           const gchar *attribute,
                           const gchar *format_string,
                           ...)
{
  GVariant *value;
  va_list ap;

  g_return_val_if_fail (G_IS_MENU_ITEM (menu_item), FALSE);
  g_return_val_if_fail (attribute != NULL, FALSE);
  g_return_val_if_fail (format_string != NULL, FALSE);

  value = g_hash_table_lookup (menu_item->attributes, attribute);

  if (value == NULL)
    return FALSE;

  if (!g_variant_check_format_string (value, format_string, FALSE))
    return FALSE;

  va_start (ap, format_string);
  g_variant_get_va (value, format_string, NULL, &ap);
  va_end (ap);

  return TRUE;
}

/**
 * g_menu_item_get_link:
 * @menu_item: a #GMenuItem
 * @link: the link name to query
 *
 * Queries the named @link on @menu_item.
 *
 * Returns: (transfer full): the link, or %NULL
 *
 * Since: 2.34
 */
GMenuModel *
g_menu_item_get_link (GMenuItem   *menu_item,
                      const gchar *link)
{
  GMenuModel *model;

  g_return_val_if_fail (G_IS_MENU_ITEM (menu_item), NULL);
  g_return_val_if_fail (link != NULL, NULL);
  g_return_val_if_fail (valid_attribute_name (link), NULL);

  model = g_hash_table_lookup (menu_item->links, link);

  if (model)
    g_object_ref (model);

  return model;
}

/**
 * g_menu_item_set_label:
 * @menu_item: a #GMenuItem
 * @label: (nullable): the label to set, or %NULL to unset
 *
 * Sets or unsets the "label" attribute of @menu_item.
 *
 * If @label is non-%NULL it is used as the label for the menu item.  If
 * it is %NULL then the label attribute is unset.
 *
 * Since: 2.32
 */
void
g_menu_item_set_label (GMenuItem   *menu_item,
                       const gchar *label)
{
  GVariant *value;

  if (label != NULL)
    value = g_variant_new_string (label);
  else
    value = NULL;

  g_menu_item_set_attribute_value (menu_item, G_MENU_ATTRIBUTE_LABEL, value);
}

/**
 * g_menu_item_set_submenu:
 * @menu_item: a #GMenuItem
 * @submenu: (nullable): a #GMenuModel, or %NULL
 *
 * Sets or unsets the "submenu" link of @menu_item to @submenu.
 *
 * If @submenu is non-%NULL, it is linked to.  If it is %NULL then the
 * link is unset.
 *
 * The effect of having one menu appear as a submenu of another is
 * exactly as it sounds.
 *
 * Since: 2.32
 */
void
g_menu_item_set_submenu (GMenuItem  *menu_item,
                         GMenuModel *submenu)
{
  g_menu_item_set_link (menu_item, G_MENU_LINK_SUBMENU, submenu);
}

/**
 * g_menu_item_set_section:
 * @menu_item: a #GMenuItem
 * @section: (nullable): a #GMenuModel, or %NULL
 *
 * Sets or unsets the "section" link of @menu_item to @section.
 *
 * The effect of having one menu appear as a section of another is
 * exactly as it sounds: the items from @section become a direct part of
 * the menu that @menu_item is added to.  See g_menu_item_new_section()
 * for more information about what it means for a menu item to be a
 * section.
 *
 * Since: 2.32
 */
void
g_menu_item_set_section (GMenuItem  *menu_item,
                         GMenuModel *section)
{
  g_menu_item_set_link (menu_item, G_MENU_LINK_SECTION, section);
}

/**
 * g_menu_item_set_action_and_target_value:
 * @menu_item: a #GMenuItem
 * @action: (nullable): the name of the action for this item
 * @target_value: (nullable): a #GVariant to use as the action target
 *
 * Sets or unsets the "action" and "target" attributes of @menu_item.
 *
 * If @action is %NULL then both the "action" and "target" attributes
 * are unset (and @target_value is ignored).
 *
 * If @action is non-%NULL then the "action" attribute is set.  The
 * "target" attribute is then set to the value of @target_value if it is
 * non-%NULL or unset otherwise.
 *
 * Normal menu items (ie: not submenu, section or other custom item
 * types) are expected to have the "action" attribute set to identify
 * the action that they are associated with.  The state type of the
 * action help to determine the disposition of the menu item.  See
 * #GAction and #GActionGroup for an overview of actions.
 *
 * In general, clicking on the menu item will result in activation of
 * the named action with the "target" attribute given as the parameter
 * to the action invocation.  If the "target" attribute is not set then
 * the action is invoked with no parameter.
 *
 * If the action has no state then the menu item is usually drawn as a
 * plain menu item (ie: with no additional decoration).
 *
 * If the action has a boolean state then the menu item is usually drawn
 * as a toggle menu item (ie: with a checkmark or equivalent
 * indication).  The item should be marked as 'toggled' or 'checked'
 * when the boolean state is %TRUE.
 *
 * If the action has a string state then the menu item is usually drawn
 * as a radio menu item (ie: with a radio bullet or equivalent
 * indication).  The item should be marked as 'selected' when the string
 * state is equal to the value of the @target property.
 *
 * See g_menu_item_set_action_and_target() or
 * g_menu_item_set_detailed_action() for two equivalent calls that are
 * probably more convenient for most uses.
 *
 * Since: 2.32
 */
void
g_menu_item_set_action_and_target_value (GMenuItem   *menu_item,
                                         const gchar *action,
                                         GVariant    *target_value)
{
  GVariant *action_value;

  if (action != NULL)
    {
      action_value = g_variant_new_string (action);
    }
  else
    {
      action_value = NULL;
      target_value = NULL;
    }

  g_menu_item_set_attribute_value (menu_item, G_MENU_ATTRIBUTE_ACTION, action_value);
  g_menu_item_set_attribute_value (menu_item, G_MENU_ATTRIBUTE_TARGET, target_value);
}

/**
 * g_menu_item_set_action_and_target:
 * @menu_item: a #GMenuItem
 * @action: (nullable): the name of the action for this item
 * @format_string: (nullable): a GVariant format string
 * @...: positional parameters, as per @format_string
 *
 * Sets or unsets the "action" and "target" attributes of @menu_item.
 *
 * If @action is %NULL then both the "action" and "target" attributes
 * are unset (and @format_string is ignored along with the positional
 * parameters).
 *
 * If @action is non-%NULL then the "action" attribute is set.
 * @format_string is then inspected.  If it is non-%NULL then the proper
 * position parameters are collected to create a #GVariant instance to
 * use as the target value.  If it is %NULL then the positional
 * parameters are ignored and the "target" attribute is unset.
 *
 * See also g_menu_item_set_action_and_target_value() for an equivalent
 * call that directly accepts a #GVariant.  See
 * g_menu_item_set_detailed_action() for a more convenient version that
 * works with string-typed targets.
 *
 * See also g_menu_item_set_action_and_target_value() for a
 * description of the semantics of the action and target attributes.
 *
 * Since: 2.32
 */
void
g_menu_item_set_action_and_target (GMenuItem   *menu_item,
                                   const gchar *action,
                                   const gchar *format_string,
                                   ...)
{
  GVariant *value;

  if (format_string != NULL)
    {
      va_list ap;

      va_start (ap, format_string);
      value = g_variant_new_va (format_string, NULL, &ap);
      va_end (ap);
    }
  else
    value = NULL;

  g_menu_item_set_action_and_target_value (menu_item, action, value);
}

/**
 * g_menu_item_set_detailed_action:
 * @menu_item: a #GMenuItem
 * @detailed_action: the "detailed" action string
 *
 * Sets the "action" and possibly the "target" attribute of @menu_item.
 *
 * The format of @detailed_action is the same format parsed by
 * g_action_parse_detailed_name().
 *
 * See g_menu_item_set_action_and_target() or
 * g_menu_item_set_action_and_target_value() for more flexible (but
 * slightly less convenient) alternatives.
 *
 * See also g_menu_item_set_action_and_target_value() for a description of
 * the semantics of the action and target attributes.
 *
 * Since: 2.32
 */
void
g_menu_item_set_detailed_action (GMenuItem   *menu_item,
                                 const gchar *detailed_action)
{
  GError *error = NULL;
  GVariant *target;
  gchar *name;

  if (!g_action_parse_detailed_name (detailed_action, &name, &target, &error))
    g_error ("g_menu_item_set_detailed_action: %s", error->message);

  g_menu_item_set_action_and_target_value (menu_item, name, target);
  if (target)
    g_variant_unref (target);
  g_free (name);
}

/**
 * g_menu_item_new:
 * @label: (nullable): the section label, or %NULL
 * @detailed_action: (nullable): the detailed action string, or %NULL
 *
 * Creates a new #GMenuItem.
 *
 * If @label is non-%NULL it is used to set the "label" attribute of the
 * new item.
 *
 * If @detailed_action is non-%NULL it is used to set the "action" and
 * possibly the "target" attribute of the new item.  See
 * g_menu_item_set_detailed_action() for more information.
 *
 * Returns: a new #GMenuItem
 *
 * Since: 2.32
 */
GMenuItem *
g_menu_item_new (const gchar *label,
                 const gchar *detailed_action)
{
  GMenuItem *menu_item;

  menu_item = g_object_new (G_TYPE_MENU_ITEM, NULL);

  if (label != NULL)
    g_menu_item_set_label (menu_item, label);

  if (detailed_action != NULL)
    g_menu_item_set_detailed_action (menu_item, detailed_action);

  return menu_item;
}

/**
 * g_menu_item_new_submenu:
 * @label: (nullable): the section label, or %NULL
 * @submenu: a #GMenuModel with the items of the submenu
 *
 * Creates a new #GMenuItem representing a submenu.
 *
 * This is a convenience API around g_menu_item_new() and
 * g_menu_item_set_submenu().
 *
 * Returns: a new #GMenuItem
 *
 * Since: 2.32
 */
GMenuItem *
g_menu_item_new_submenu (const gchar *label,
                         GMenuModel  *submenu)
{
  GMenuItem *menu_item;

  menu_item = g_object_new (G_TYPE_MENU_ITEM, NULL);

  if (label != NULL)
    g_menu_item_set_label (menu_item, label);

  g_menu_item_set_submenu (menu_item, submenu);

  return menu_item;
}

/**
 * g_menu_item_new_section:
 * @label: (nullable): the section label, or %NULL
 * @section: a #GMenuModel with the items of the section
 *
 * Creates a new #GMenuItem representing a section.
 *
 * This is a convenience API around g_menu_item_new() and
 * g_menu_item_set_section().
 *
 * The effect of having one menu appear as a section of another is
 * exactly as it sounds: the items from @section become a direct part of
 * the menu that @menu_item is added to.
 *
 * Visual separation is typically displayed between two non-empty
 * sections.  If @label is non-%NULL then it will be encorporated into
 * this visual indication.  This allows for labeled subsections of a
 * menu.
 *
 * As a simple example, consider a typical "Edit" menu from a simple
 * program.  It probably contains an "Undo" and "Redo" item, followed by
 * a separator, followed by "Cut", "Copy" and "Paste".
 *
 * This would be accomplished by creating three #GMenu instances.  The
 * first would be populated with the "Undo" and "Redo" items, and the
 * second with the "Cut", "Copy" and "Paste" items.  The first and
 * second menus would then be added as submenus of the third.  In XML
 * format, this would look something like the following:
 * |[
 * <menu id='edit-menu'>
 *   <section>
 *     <item label='Undo'/>
 *     <item label='Redo'/>
 *   </section>
 *   <section>
 *     <item label='Cut'/>
 *     <item label='Copy'/>
 *     <item label='Paste'/>
 *   </section>
 * </menu>
 * ]|
 *
 * The following example is exactly equivalent.  It is more illustrative
 * of the exact relationship between the menus and items (keeping in
 * mind that the 'link' element defines a new menu that is linked to the
 * containing one).  The style of the second example is more verbose and
 * difficult to read (and therefore not recommended except for the
 * purpose of understanding what is really going on).
 * |[
 * <menu id='edit-menu'>
 *   <item>
 *     <link name='section'>
 *       <item label='Undo'/>
 *       <item label='Redo'/>
 *     </link>
 *   </item>
 *   <item>
 *     <link name='section'>
 *       <item label='Cut'/>
 *       <item label='Copy'/>
 *       <item label='Paste'/>
 *     </link>
 *   </item>
 * </menu>
 * ]|
 *
 * Returns: a new #GMenuItem
 *
 * Since: 2.32
 */
GMenuItem *
g_menu_item_new_section (const gchar *label,
                         GMenuModel  *section)
{
  GMenuItem *menu_item;

  menu_item = g_object_new (G_TYPE_MENU_ITEM, NULL);

  if (label != NULL)
    g_menu_item_set_label (menu_item, label);

  g_menu_item_set_section (menu_item, section);

  return menu_item;
}

/**
 * g_menu_item_new_from_model:
 * @model: a #GMenuModel
 * @item_index: the index of an item in @model
 *
 * Creates a #GMenuItem as an exact copy of an existing menu item in a
 * #GMenuModel.
 *
 * @item_index must be valid (ie: be sure to call
 * g_menu_model_get_n_items() first).
 *
 * Returns: a new #GMenuItem.
 *
 * Since: 2.34
 */
GMenuItem *
g_menu_item_new_from_model (GMenuModel *model,
                            gint        item_index)
{
  GMenuModelClass *class = G_MENU_MODEL_GET_CLASS (model);
  GMenuItem *menu_item;

  menu_item = g_object_new (G_TYPE_MENU_ITEM, NULL);

  /* With some trickery we can be pretty efficient.
   *
   * A GMenuModel must either implement iterate_item_attributes() or
   * get_item_attributes().  If it implements get_item_attributes() then
   * we are in luck -- we can just take a reference on the returned
   * hashtable and mark ourselves as copy-on-write.
   *
   * In the case that the model is based on get_item_attributes (which
   * is the case for both GMenu and GDBusMenuModel) then this is
   * basically just g_hash_table_ref().
   */
  if (class->get_item_attributes)
    {
      GHashTable *attributes = NULL;

      class->get_item_attributes (model, item_index, &attributes);
      if (attributes)
        {
          g_hash_table_unref (menu_item->attributes);
          menu_item->attributes = attributes;
          menu_item->cow = TRUE;
        }
    }
  else
    {
      GMenuAttributeIter *iter;
      const gchar *attribute;
      GVariant *value;

      iter = g_menu_model_iterate_item_attributes (model, item_index);
      while (g_menu_attribute_iter_get_next (iter, &attribute, &value))
        g_hash_table_insert (menu_item->attributes, g_strdup (attribute), value);
      g_object_unref (iter);
    }

  /* Same story for the links... */
  if (class->get_item_links)
    {
      GHashTable *links = NULL;

      class->get_item_links (model, item_index, &links);
      if (links)
        {
          g_hash_table_unref (menu_item->links);
          menu_item->links = links;
          menu_item->cow = TRUE;
        }
    }
  else
    {
      GMenuLinkIter *iter;
      const gchar *link;
      GMenuModel *value;

      iter = g_menu_model_iterate_item_links (model, item_index);
      while (g_menu_link_iter_get_next (iter, &link, &value))
        g_hash_table_insert (menu_item->links, g_strdup (link), value);
      g_object_unref (iter);
    }

  return menu_item;
}

/**
 * g_menu_item_set_icon:
 * @menu_item: a #GMenuItem
 * @icon: a #GIcon, or %NULL
 *
 * Sets (or unsets) the icon on @menu_item.
 *
 * This call is the same as calling g_icon_serialize() and using the
 * result as the value to g_menu_item_set_attribute_value() for
 * %G_MENU_ATTRIBUTE_ICON.
 *
 * This API is only intended for use with "noun" menu items; things like
 * bookmarks or applications in an "Open With" menu.  Don't use it on
 * menu items corresponding to verbs (eg: stock icons for 'Save' or
 * 'Quit').
 *
 * If @icon is %NULL then the icon is unset.
 *
 * Since: 2.38
 **/
void
g_menu_item_set_icon (GMenuItem *menu_item,
                      GIcon     *icon)
{
  GVariant *value;

  g_return_if_fail (G_IS_MENU_ITEM (menu_item));
  g_return_if_fail (icon == NULL || G_IS_ICON (icon));

  if (icon != NULL)
    value = g_icon_serialize (icon);
  else
    value = NULL;

  g_menu_item_set_attribute_value (menu_item, G_MENU_ATTRIBUTE_ICON, value);
  if (value)
    g_variant_unref (value);
}