1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
19
20 /*
21 * MT safe
22 */
23
24 #include "config.h"
25
26 #include <string.h>
27
28 #include "genums.h"
29 #include "gvalue.h"
30 #include "gvaluecollector.h"
31 #include "gobjectalias.h"
32
33
34 /**
35 * SECTION:enumerations_flags
36 * @short_description: Enumeration and flags types
37 * @see_also:#GParamSpecEnum, #GParamSpecFlags, g_param_spec_enum(),
38 * g_param_spec_flags(),
39 *
40 * <link linkend="glib-mkenums">glib-mkenums</link>
41 * @title: Enumeration and Flag Types
42 *
43 * The GLib type system provides fundamental types for enumeration and
44 * flags types. (Flags types are like enumerations, but allow their
45 * values to be combined by bitwise or). A registered enumeration or
46 * flags type associates a name and a nickname with each allowed
47 * value, and the methods g_enum_get_value_by_name(),
48 * g_enum_get_value_by_nick(), g_flags_get_value_by_name() and
49 * g_flags_get_value_by_nick() can look up values by their name or
50 * nickname. When an enumeration or flags type is registered with the
51 * GLib type system, it can be used as value type for object
52 * properties, using g_param_spec_enum() or g_param_spec_flags().
53 *
54 * GObject ships with a utility called <link
55 * linkend="glib-mkenums">glib-mkenums</link> that can construct
56 * suitable type registration functions from C enumeration
57 * definitions.
58 */
59
60
61 /* --- prototypes --- */
62 static void g_enum_class_init (GEnumClass *class,
63 gpointer class_data);
64 static void g_flags_class_init (GFlagsClass *class,
65 gpointer class_data);
66 static void value_flags_enum_init (GValue *value);
67 static void value_flags_enum_copy_value (const GValue *src_value,
68 GValue *dest_value);
69 static gchar* value_flags_enum_collect_value (GValue *value,
70 guint n_collect_values,
71 GTypeCValue *collect_values,
72 guint collect_flags);
73 static gchar* value_flags_enum_lcopy_value (const GValue *value,
74 guint n_collect_values,
75 GTypeCValue *collect_values,
76 guint collect_flags);
77
78 /* --- functions --- */
79 void
g_enum_types_init(void)80 g_enum_types_init (void)
81 {
82 static gboolean initialized = FALSE;
83 static const GTypeValueTable flags_enum_value_table = {
84 value_flags_enum_init, /* value_init */
85 NULL, /* value_free */
86 value_flags_enum_copy_value, /* value_copy */
87 NULL, /* value_peek_pointer */
88 "i", /* collect_format */
89 value_flags_enum_collect_value, /* collect_value */
90 "p", /* lcopy_format */
91 value_flags_enum_lcopy_value, /* lcopy_value */
92 };
93 static GTypeInfo info = {
94 0, /* class_size */
95 NULL, /* base_init */
96 NULL, /* base_destroy */
97 NULL, /* class_init */
98 NULL, /* class_destroy */
99 NULL, /* class_data */
100 0, /* instance_size */
101 0, /* n_preallocs */
102 NULL, /* instance_init */
103 &flags_enum_value_table, /* value_table */
104 };
105 static const GTypeFundamentalInfo finfo = {
106 G_TYPE_FLAG_CLASSED | G_TYPE_FLAG_DERIVABLE,
107 };
108 GType type;
109
110 g_return_if_fail (initialized == FALSE);
111 initialized = TRUE;
112
113 /* G_TYPE_ENUM
114 */
115 info.class_size = sizeof (GEnumClass);
116 type = g_type_register_fundamental (G_TYPE_ENUM, g_intern_static_string ("GEnum"), &info, &finfo,
117 G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT);
118 g_assert (type == G_TYPE_ENUM);
119
120 /* G_TYPE_FLAGS
121 */
122 info.class_size = sizeof (GFlagsClass);
123 type = g_type_register_fundamental (G_TYPE_FLAGS, g_intern_static_string ("GFlags"), &info, &finfo,
124 G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT);
125 g_assert (type == G_TYPE_FLAGS);
126 }
127
128 static void
value_flags_enum_init(GValue * value)129 value_flags_enum_init (GValue *value)
130 {
131 value->data[0].v_long = 0;
132 }
133
134 static void
value_flags_enum_copy_value(const GValue * src_value,GValue * dest_value)135 value_flags_enum_copy_value (const GValue *src_value,
136 GValue *dest_value)
137 {
138 dest_value->data[0].v_long = src_value->data[0].v_long;
139 }
140
141 static gchar*
value_flags_enum_collect_value(GValue * value,guint n_collect_values,GTypeCValue * collect_values,guint collect_flags)142 value_flags_enum_collect_value (GValue *value,
143 guint n_collect_values,
144 GTypeCValue *collect_values,
145 guint collect_flags)
146 {
147 value->data[0].v_long = collect_values[0].v_int;
148
149 return NULL;
150 }
151
152 static gchar*
value_flags_enum_lcopy_value(const GValue * value,guint n_collect_values,GTypeCValue * collect_values,guint collect_flags)153 value_flags_enum_lcopy_value (const GValue *value,
154 guint n_collect_values,
155 GTypeCValue *collect_values,
156 guint collect_flags)
157 {
158 gint *int_p = collect_values[0].v_pointer;
159
160 if (!int_p)
161 return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
162
163 *int_p = value->data[0].v_long;
164
165 return NULL;
166 }
167
168 /**
169 * g_enum_register_static:
170 * @name: A nul-terminated string used as the name of the new type.
171 * @const_static_values: An array of #GEnumValue structs for the possible
172 * enumeration values. The array is terminated by a struct with all
173 * members being 0. GObject keeps a reference to the data, so it cannot
174 * be stack-allocated.
175 *
176 * Registers a new static enumeration type with the name @name.
177 *
178 * It is normally more convenient to let <link
179 * linkend="glib-mkenums">glib-mkenums</link> generate a
180 * my_enum_get_type() function from a usual C enumeration definition
181 * than to write one yourself using g_enum_register_static().
182 *
183 * Returns: The new type identifier.
184 */
185 GType
g_enum_register_static(const gchar * name,const GEnumValue * const_static_values)186 g_enum_register_static (const gchar *name,
187 const GEnumValue *const_static_values)
188 {
189 GTypeInfo enum_type_info = {
190 sizeof (GEnumClass), /* class_size */
191 NULL, /* base_init */
192 NULL, /* base_finalize */
193 (GClassInitFunc) g_enum_class_init,
194 NULL, /* class_finalize */
195 NULL, /* class_data */
196 0, /* instance_size */
197 0, /* n_preallocs */
198 NULL, /* instance_init */
199 NULL, /* value_table */
200 };
201 GType type;
202
203 g_return_val_if_fail (name != NULL, 0);
204 g_return_val_if_fail (const_static_values != NULL, 0);
205
206 enum_type_info.class_data = const_static_values;
207
208 type = g_type_register_static (G_TYPE_ENUM, name, &enum_type_info, 0);
209
210 return type;
211 }
212
213 /**
214 * g_flags_register_static:
215 * @name: A nul-terminated string used as the name of the new type.
216 * @const_static_values: An array of #GFlagsValue structs for the possible
217 * flags values. The array is terminated by a struct with all members being 0.
218 * GObject keeps a reference to the data, so it cannot be stack-allocated.
219 *
220 * Registers a new static flags type with the name @name.
221 *
222 * It is normally more convenient to let <link
223 * linkend="glib-mkenums">glib-mkenums</link> generate a
224 * my_flags_get_type() function from a usual C enumeration definition
225 * than to write one yourself using g_flags_register_static().
226 *
227 * Returns: The new type identifier.
228 */
229 GType
g_flags_register_static(const gchar * name,const GFlagsValue * const_static_values)230 g_flags_register_static (const gchar *name,
231 const GFlagsValue *const_static_values)
232 {
233 GTypeInfo flags_type_info = {
234 sizeof (GFlagsClass), /* class_size */
235 NULL, /* base_init */
236 NULL, /* base_finalize */
237 (GClassInitFunc) g_flags_class_init,
238 NULL, /* class_finalize */
239 NULL, /* class_data */
240 0, /* instance_size */
241 0, /* n_preallocs */
242 NULL, /* instance_init */
243 NULL, /* value_table */
244 };
245 GType type;
246
247 g_return_val_if_fail (name != NULL, 0);
248 g_return_val_if_fail (const_static_values != NULL, 0);
249
250 flags_type_info.class_data = const_static_values;
251
252 type = g_type_register_static (G_TYPE_FLAGS, name, &flags_type_info, 0);
253
254 return type;
255 }
256
257 /**
258 * g_enum_complete_type_info:
259 * @g_enum_type: the type identifier of the type being completed
260 * @info: the #GTypeInfo struct to be filled in
261 * @const_values: An array of #GEnumValue structs for the possible
262 * enumeration values. The array is terminated by a struct with all
263 * members being 0.
264 *
265 * This function is meant to be called from the complete_type_info()
266 * function of a #GTypePlugin implementation, as in the following
267 * example:
268 *
269 * |[
270 * static void
271 * my_enum_complete_type_info (GTypePlugin *plugin,
272 * GType g_type,
273 * GTypeInfo *info,
274 * GTypeValueTable *value_table)
275 * {
276 * static const GEnumValue values[] = {
277 * { MY_ENUM_FOO, "MY_ENUM_FOO", "foo" },
278 * { MY_ENUM_BAR, "MY_ENUM_BAR", "bar" },
279 * { 0, NULL, NULL }
280 * };
281 *
282 * g_enum_complete_type_info (type, info, values);
283 * }
284 * ]|
285 */
286 void
g_enum_complete_type_info(GType g_enum_type,GTypeInfo * info,const GEnumValue * const_values)287 g_enum_complete_type_info (GType g_enum_type,
288 GTypeInfo *info,
289 const GEnumValue *const_values)
290 {
291 g_return_if_fail (G_TYPE_IS_ENUM (g_enum_type));
292 g_return_if_fail (info != NULL);
293 g_return_if_fail (const_values != NULL);
294
295 info->class_size = sizeof (GEnumClass);
296 info->base_init = NULL;
297 info->base_finalize = NULL;
298 info->class_init = (GClassInitFunc) g_enum_class_init;
299 info->class_finalize = NULL;
300 info->class_data = const_values;
301 }
302
303 /**
304 * g_flags_complete_type_info:
305 * @g_flags_type: the type identifier of the type being completed
306 * @info: the #GTypeInfo struct to be filled in
307 * @const_values: An array of #GFlagsValue structs for the possible
308 * enumeration values. The array is terminated by a struct with all
309 * members being 0.
310 *
311 * This function is meant to be called from the complete_type_info()
312 * function of a #GTypePlugin implementation, see the example for
313 * g_enum_complete_type_info() above.
314 */
315 void
g_flags_complete_type_info(GType g_flags_type,GTypeInfo * info,const GFlagsValue * const_values)316 g_flags_complete_type_info (GType g_flags_type,
317 GTypeInfo *info,
318 const GFlagsValue *const_values)
319 {
320 g_return_if_fail (G_TYPE_IS_FLAGS (g_flags_type));
321 g_return_if_fail (info != NULL);
322 g_return_if_fail (const_values != NULL);
323
324 info->class_size = sizeof (GFlagsClass);
325 info->base_init = NULL;
326 info->base_finalize = NULL;
327 info->class_init = (GClassInitFunc) g_flags_class_init;
328 info->class_finalize = NULL;
329 info->class_data = const_values;
330 }
331
332 static void
g_enum_class_init(GEnumClass * class,gpointer class_data)333 g_enum_class_init (GEnumClass *class,
334 gpointer class_data)
335 {
336 g_return_if_fail (G_IS_ENUM_CLASS (class));
337
338 class->minimum = 0;
339 class->maximum = 0;
340 class->n_values = 0;
341 class->values = class_data;
342
343 if (class->values)
344 {
345 GEnumValue *values;
346
347 class->minimum = class->values->value;
348 class->maximum = class->values->value;
349 for (values = class->values; values->value_name; values++)
350 {
351 class->minimum = MIN (class->minimum, values->value);
352 class->maximum = MAX (class->maximum, values->value);
353 class->n_values++;
354 }
355 }
356 }
357
358 static void
g_flags_class_init(GFlagsClass * class,gpointer class_data)359 g_flags_class_init (GFlagsClass *class,
360 gpointer class_data)
361 {
362 g_return_if_fail (G_IS_FLAGS_CLASS (class));
363
364 class->mask = 0;
365 class->n_values = 0;
366 class->values = class_data;
367
368 if (class->values)
369 {
370 GFlagsValue *values;
371
372 for (values = class->values; values->value_name; values++)
373 {
374 class->mask |= values->value;
375 class->n_values++;
376 }
377 }
378 }
379
380 /**
381 * g_enum_get_value_by_name:
382 * @enum_class: a #GEnumClass
383 * @name: the name to look up
384 *
385 * Looks up a #GEnumValue by name.
386 *
387 * Returns: the #GEnumValue with name @name, or %NULL if the
388 * enumeration doesn't have a member with that name
389 */
390 GEnumValue*
g_enum_get_value_by_name(GEnumClass * enum_class,const gchar * name)391 g_enum_get_value_by_name (GEnumClass *enum_class,
392 const gchar *name)
393 {
394 g_return_val_if_fail (G_IS_ENUM_CLASS (enum_class), NULL);
395 g_return_val_if_fail (name != NULL, NULL);
396
397 if (enum_class->n_values)
398 {
399 GEnumValue *enum_value;
400
401 for (enum_value = enum_class->values; enum_value->value_name; enum_value++)
402 if (strcmp (name, enum_value->value_name) == 0)
403 return enum_value;
404 }
405
406 return NULL;
407 }
408
409 /**
410 * g_flags_get_value_by_name:
411 * @flags_class: a #GFlagsClass
412 * @name: the name to look up
413 *
414 * Looks up a #GFlagsValue by name.
415 *
416 * Returns: the #GFlagsValue with name @name, or %NULL if there is no
417 * flag with that name
418 */
419 GFlagsValue*
g_flags_get_value_by_name(GFlagsClass * flags_class,const gchar * name)420 g_flags_get_value_by_name (GFlagsClass *flags_class,
421 const gchar *name)
422 {
423 g_return_val_if_fail (G_IS_FLAGS_CLASS (flags_class), NULL);
424 g_return_val_if_fail (name != NULL, NULL);
425
426 if (flags_class->n_values)
427 {
428 GFlagsValue *flags_value;
429
430 for (flags_value = flags_class->values; flags_value->value_name; flags_value++)
431 if (strcmp (name, flags_value->value_name) == 0)
432 return flags_value;
433 }
434
435 return NULL;
436 }
437
438 /**
439 * g_enum_get_value_by_nick:
440 * @enum_class: a #GEnumClass
441 * @nick: the nickname to look up
442 *
443 * Looks up a #GEnumValue by nickname.
444 *
445 * Returns: the #GEnumValue with nickname @nick, or %NULL if the
446 * enumeration doesn't have a member with that nickname
447 */
448 GEnumValue*
g_enum_get_value_by_nick(GEnumClass * enum_class,const gchar * nick)449 g_enum_get_value_by_nick (GEnumClass *enum_class,
450 const gchar *nick)
451 {
452 g_return_val_if_fail (G_IS_ENUM_CLASS (enum_class), NULL);
453 g_return_val_if_fail (nick != NULL, NULL);
454
455 if (enum_class->n_values)
456 {
457 GEnumValue *enum_value;
458
459 for (enum_value = enum_class->values; enum_value->value_name; enum_value++)
460 if (enum_value->value_nick && strcmp (nick, enum_value->value_nick) == 0)
461 return enum_value;
462 }
463
464 return NULL;
465 }
466
467 /**
468 * g_flags_get_value_by_nick:
469 * @flags_class: a #GFlagsClass
470 * @nick: the nickname to look up
471 *
472 * Looks up a #GFlagsValue by nickname.
473 *
474 * Returns: the #GFlagsValue with nickname @nick, or %NULL if there is
475 * no flag with that nickname
476 */
477 GFlagsValue*
g_flags_get_value_by_nick(GFlagsClass * flags_class,const gchar * nick)478 g_flags_get_value_by_nick (GFlagsClass *flags_class,
479 const gchar *nick)
480 {
481 g_return_val_if_fail (G_IS_FLAGS_CLASS (flags_class), NULL);
482 g_return_val_if_fail (nick != NULL, NULL);
483
484 if (flags_class->n_values)
485 {
486 GFlagsValue *flags_value;
487
488 for (flags_value = flags_class->values; flags_value->value_nick; flags_value++)
489 if (flags_value->value_nick && strcmp (nick, flags_value->value_nick) == 0)
490 return flags_value;
491 }
492
493 return NULL;
494 }
495
496 /**
497 * g_enum_get_value:
498 * @enum_class: a #GEnumClass
499 * @value: the value to look up
500 *
501 * Returns the #GEnumValue for a value.
502 *
503 * Returns: the #GEnumValue for @value, or %NULL if @value is not a
504 * member of the enumeration
505 */
506 GEnumValue*
g_enum_get_value(GEnumClass * enum_class,gint value)507 g_enum_get_value (GEnumClass *enum_class,
508 gint value)
509 {
510 g_return_val_if_fail (G_IS_ENUM_CLASS (enum_class), NULL);
511
512 if (enum_class->n_values)
513 {
514 GEnumValue *enum_value;
515
516 for (enum_value = enum_class->values; enum_value->value_name; enum_value++)
517 if (enum_value->value == value)
518 return enum_value;
519 }
520
521 return NULL;
522 }
523
524 /**
525 * g_flags_get_first_value:
526 * @flags_class: a #GFlagsClass
527 * @value: the value
528 *
529 * Returns the first #GFlagsValue which is set in @value.
530 *
531 * Returns: the first #GFlagsValue which is set in @value, or %NULL if
532 * none is set
533 */
534 GFlagsValue*
g_flags_get_first_value(GFlagsClass * flags_class,guint value)535 g_flags_get_first_value (GFlagsClass *flags_class,
536 guint value)
537 {
538 g_return_val_if_fail (G_IS_FLAGS_CLASS (flags_class), NULL);
539
540 if (flags_class->n_values)
541 {
542 GFlagsValue *flags_value;
543
544 if (value == 0)
545 {
546 for (flags_value = flags_class->values; flags_value->value_name; flags_value++)
547 if (flags_value->value == 0)
548 return flags_value;
549 }
550 else
551 {
552 for (flags_value = flags_class->values; flags_value->value_name; flags_value++)
553 if (flags_value->value != 0 && (flags_value->value & value) == flags_value->value)
554 return flags_value;
555 }
556 }
557
558 return NULL;
559 }
560
561 /**
562 * g_value_set_enum:
563 * @value: a valid #GValue whose type is derived from %G_TYPE_ENUM
564 * @v_enum: enum value to be set
565 *
566 * Set the contents of a %G_TYPE_ENUM #GValue to @v_enum.
567 */
568 void
g_value_set_enum(GValue * value,gint v_enum)569 g_value_set_enum (GValue *value,
570 gint v_enum)
571 {
572 g_return_if_fail (G_VALUE_HOLDS_ENUM (value));
573
574 value->data[0].v_long = v_enum;
575 }
576
577 /**
578 * g_value_get_enum:
579 * @value: a valid #GValue whose type is derived from %G_TYPE_ENUM
580 *
581 * Get the contents of a %G_TYPE_ENUM #GValue.
582 *
583 * Returns: enum contents of @value
584 */
585 gint
g_value_get_enum(const GValue * value)586 g_value_get_enum (const GValue *value)
587 {
588 g_return_val_if_fail (G_VALUE_HOLDS_ENUM (value), 0);
589
590 return value->data[0].v_long;
591 }
592
593 /**
594 * g_value_set_flags:
595 * @value: a valid #GValue whose type is derived from %G_TYPE_FLAGS
596 * @v_flags: flags value to be set
597 *
598 * Set the contents of a %G_TYPE_FLAGS #GValue to @v_flags.
599 */
600 void
g_value_set_flags(GValue * value,guint v_flags)601 g_value_set_flags (GValue *value,
602 guint v_flags)
603 {
604 g_return_if_fail (G_VALUE_HOLDS_FLAGS (value));
605
606 value->data[0].v_ulong = v_flags;
607 }
608
609 /**
610 * g_value_get_flags:
611 * @value: a valid #GValue whose type is derived from %G_TYPE_FLAGS
612 *
613 * Get the contents of a %G_TYPE_FLAGS #GValue.
614 *
615 * Returns: flags contents of @value
616 */
617 guint
g_value_get_flags(const GValue * value)618 g_value_get_flags (const GValue *value)
619 {
620 g_return_val_if_fail (G_VALUE_HOLDS_FLAGS (value), 0);
621
622 return value->data[0].v_ulong;
623 }
624
625 #define __G_ENUMS_C__
626 #include "gobjectaliasdef.c"
627