summaryrefslogtreecommitdiff
path: root/src/ld-library.c
blob: 4c980d00fafecc76224da4c7ce30a7045033518b (plain)
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
/*
 * ld-library.c
 *
 * This file is a part of logdiag.
 * Copyright Přemysl Janouch 2010. All rights reserved.
 *
 * See the file LICENSE for licensing information.
 *
 */

#include <string.h>

#include <gtk/gtk.h>
#include <json-glib/json-glib.h>

#include "config.h"

#include "ld-symbol.h"
#include "ld-symbol-category.h"
#include "ld-library.h"

#include "ld-lua.h"


/**
 * SECTION:ld-library
 * @short_description: A symbol library.
 * @see_also: #LdSymbol, #LdSymbolCategory
 *
 * #LdLibrary is used for loading symbols from their files.
 */

/*
 * LdLibraryPrivate:
 * @lua: State of the scripting language.
 * @children: Child objects of the library.
 */
struct _LdLibraryPrivate
{
	LdLua *lua;
	GSList *children;
};

G_DEFINE_TYPE (LdLibrary, ld_library, G_TYPE_OBJECT);

static void ld_library_finalize (GObject *gobject);

static LdSymbolCategory *load_category (LdLibrary *self,
	const gchar *path, const gchar *name);
static gboolean load_category_cb (const gchar *base,
	const gchar *filename, gpointer userdata);
static void load_category_symbol_cb (LdSymbol *symbol, gpointer user_data);

static gchar *read_human_name_from_file (const gchar *filename);

static gboolean foreach_dir (const gchar *path,
	gboolean (*callback) (const gchar *, const gchar *, gpointer),
	gpointer userdata, GError **error);
static gboolean ld_library_load_cb
	(const gchar *base, const gchar *filename, gpointer userdata);


static void
ld_library_class_init (LdLibraryClass *klass)
{
	GObjectClass *object_class;

	object_class = G_OBJECT_CLASS (klass);
	object_class->finalize = ld_library_finalize;

/**
 * LdLibrary::changed:
 * @library: The library object.
 *
 * Contents of the library have changed.
 */
	klass->changed_signal = g_signal_new
		("changed", G_TYPE_FROM_CLASS (klass),
		G_SIGNAL_RUN_LAST, 0, NULL, NULL,
		g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);

	g_type_class_add_private (klass, sizeof (LdLibraryPrivate));
}

static void
ld_library_init (LdLibrary *self)
{
	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
		(self, LD_TYPE_LIBRARY, LdLibraryPrivate);

	self->priv->lua = ld_lua_new ();
	self->priv->children = NULL;
}

static void
ld_library_finalize (GObject *gobject)
{
	LdLibrary *self;

	self = LD_LIBRARY (gobject);

	g_object_unref (self->priv->lua);

	g_slist_foreach (self->priv->children, (GFunc) g_object_unref, NULL);
	g_slist_free (self->priv->children);

	/* Chain up to the parent class. */
	G_OBJECT_CLASS (ld_library_parent_class)->finalize (gobject);
}

/**
 * ld_library_new:
 *
 * Create an instance.
 */
LdLibrary *
ld_library_new (void)
{
	return g_object_new (LD_TYPE_LIBRARY, NULL);
}

/*
 * foreach_dir:
 *
 * Call a user-defined function for each file within a directory.
 */
static gboolean
foreach_dir (const gchar *path,
	gboolean (*callback) (const gchar *, const gchar *, gpointer),
	gpointer userdata, GError **error)
{
	GDir *dir;
	const gchar *item;

	/* FIXME: We don't set an error. */
	g_return_val_if_fail (path != NULL, FALSE);
	g_return_val_if_fail (callback != NULL, FALSE);

	dir = g_dir_open (path, 0, error);
	if (!dir)
		return FALSE;

	while ((item = g_dir_read_name (dir)))
	{
		gchar *filename;

		filename = g_build_filename (path, item, NULL);
		if (!callback (item, filename, userdata))
			break;
		g_free (filename);
	}
	g_dir_close (dir);
	return TRUE;
}

/*
 * LoadCategoryData:
 *
 * Data shared between load_category() and load_category_cb().
 */
typedef struct
{
	LdLibrary *self;
	LdSymbolCategory *cat;
}
LoadCategoryData;

/*
 * load_category:
 * @self: A symbol library object.
 * @path: The path to the category.
 * @name: The default name of the category.
 *
 * Loads a category into the library.
 */
static LdSymbolCategory *
load_category (LdLibrary *self, const gchar *path, const gchar *name)
{
	LdSymbolCategory *cat;
	gchar *icon_file, *category_file;
	gchar *human_name;
	LoadCategoryData data;

	g_return_val_if_fail (LD_IS_LIBRARY (self), NULL);
	g_return_val_if_fail (path != NULL, NULL);
	g_return_val_if_fail (name != NULL, NULL);

	if (!g_file_test (path, G_FILE_TEST_IS_DIR))
		goto load_category_fail_1;

	icon_file = g_build_filename (path, "icon.svg", NULL);
	if (!g_file_test (icon_file, G_FILE_TEST_IS_REGULAR))
	{
		g_warning ("The category in %s has no icon.", path);
		goto load_category_fail_2;
	}

	category_file = g_build_filename (path, "category.json", NULL);
	human_name = read_human_name_from_file (category_file);
	if (!human_name)
		human_name = g_strdup (name);

	cat = ld_symbol_category_new (name, human_name);
	ld_symbol_category_set_image_path (cat, icon_file);

	data.self = self;
	data.cat = cat;
	foreach_dir (path, load_category_cb, &data, NULL);

	g_free (human_name);
	g_free (category_file);
	g_free (icon_file);
	return cat;

load_category_fail_2:
	g_free (icon_file);
load_category_fail_1:
	return NULL;
}

/*
 * load_category_cb:
 *
 * Load script files from a directory into a symbol category.
 */
static gboolean
load_category_cb (const gchar *base, const gchar *filename, gpointer userdata)
{
	LoadCategoryData *data;

	g_return_val_if_fail (base != NULL, FALSE);
	g_return_val_if_fail (filename != NULL, FALSE);
	g_return_val_if_fail (userdata != NULL, FALSE);

	data = (LoadCategoryData *) userdata;

	if (ld_lua_check_file (data->self->priv->lua, filename))
		ld_lua_load_file (data->self->priv->lua, filename,
			load_category_symbol_cb, data->cat);
	return TRUE;
}

/*
 * load_category_symbol_cb:
 *
 * Insert newly registered symbols into the category.
 */
static void
load_category_symbol_cb (LdSymbol *symbol, gpointer user_data)
{
	const gchar *name;
	LdSymbolCategory *cat;
	const GSList *children, *iter;

	g_return_if_fail (LD_IS_SYMBOL (symbol));
	g_return_if_fail (LD_IS_SYMBOL_CATEGORY (user_data));

	cat = LD_SYMBOL_CATEGORY (user_data);
	name = ld_symbol_get_name (symbol);

	/* Check for name collisions with other symbols. */
	children = ld_symbol_category_get_children (cat);
	for (iter = children; iter; iter = iter->next)
	{
		if (!LD_IS_SYMBOL (iter->data))
			continue;
		if (!strcmp (name, ld_symbol_get_name (LD_SYMBOL (iter->data))))
		{
			g_warning ("Attempted to insert multiple '%s' symbols into"
				" category '%s'.", name, ld_symbol_category_get_name (cat));
			return;
		}
	}
	ld_symbol_category_insert_child (cat, G_OBJECT (symbol), -1);
}

/*
 * read_human_name_from_file:
 * @filename: Where the JSON file is located.
 *
 * Read the human name of the processed category.
 */
static gchar *
read_human_name_from_file (const gchar *filename)
{
	const gchar *const *lang;
	JsonParser *parser;
	JsonNode *root;
	JsonObject *object;
	GError *error;

	g_return_val_if_fail (filename != NULL, NULL);

	parser = json_parser_new ();
	error = NULL;
	if (!json_parser_load_from_file (parser, filename, &error))
	{
		g_warning ("%s", error->message);
		g_error_free (error);
		goto read_human_name_from_file_end;
	}

	root = json_parser_get_root (parser);
	if (!JSON_NODE_HOLDS_OBJECT (root))
	{
		g_warning ("Failed to parse '%s': %s", filename,
			"The root node is not an object.");
		goto read_human_name_from_file_end;
	}

	object = json_node_get_object (root);
	for (lang = g_get_language_names (); *lang; lang++)
	{
		const gchar *member;

		if (!json_object_has_member (object, *lang))
			continue;
		member = json_object_get_string_member (object, *lang);

		if (member != NULL)
		{
			gchar *result;

			result = g_strdup (member);
			g_object_unref (parser);
			return result;
		}
	}

read_human_name_from_file_end:
	g_object_unref (parser);
	return NULL;
}

/*
 * LibraryLoadData:
 *
 * Data shared between ld_library_load() and ld_library_load_cb().
 */
typedef struct
{
	LdLibrary *self;
	gboolean changed;
}
LibraryLoadData;

/**
 * ld_library_load:
 * @self: A symbol library object.
 * @directory: A directory to be loaded.
 *
 * Load the contents of a directory into the library.
 */
gboolean
ld_library_load (LdLibrary *self, const gchar *directory)
{
	LibraryLoadData data;

	g_return_val_if_fail (LD_IS_LIBRARY (self), FALSE);
	g_return_val_if_fail (directory != NULL, FALSE);

	data.self = self;
	data.changed = FALSE;
	foreach_dir (directory, ld_library_load_cb, &data, NULL);

	if (data.changed)
		g_signal_emit (self, LD_LIBRARY_GET_CLASS (self)->changed_signal, 0);

	return TRUE;
}

/*
 * ld_library_load_cb:
 *
 * A callback that's called for each file in the root directory.
 */
static gboolean
ld_library_load_cb (const gchar *base, const gchar *filename, gpointer userdata)
{
	LdSymbolCategory *cat;
	LibraryLoadData *data;

	g_return_val_if_fail (base != NULL, FALSE);
	g_return_val_if_fail (filename != NULL, FALSE);
	g_return_val_if_fail (userdata != NULL, FALSE);

	data = (LibraryLoadData *) userdata;

	cat = load_category (data->self, filename, base);
	if (cat)
		ld_library_insert_child (data->self, G_OBJECT (cat), -1);

	data->changed = TRUE;
	return TRUE;
}

/**
 * ld_library_find_symbol:
 * @self: A symbol library object.
 * @identifier: An identifier of the symbol to be searched for.
 *
 * Search for a symbol in the library.
 *
 * Return value: A symbol object if found, NULL otherwise.
 */
/* XXX: With this level of indentation, this function is really ugly. */
LdSymbol *
ld_library_find_symbol (LdLibrary *self, const gchar *identifier)
{
	gchar **id_el_start, **id_el;
	const GSList *list, *list_el;

	g_return_val_if_fail (LD_IS_LIBRARY (self), NULL);
	g_return_val_if_fail (identifier != NULL, NULL);

	id_el_start = g_strsplit (identifier, LD_LIBRARY_IDENTIFIER_SEPARATOR, 0);
	if (!id_el_start)
		return NULL;

	list = ld_library_get_children (self);
	for (id_el = id_el_start; id_el[0]; id_el++)
	{
		LdSymbolCategory *cat;
		LdSymbol *symbol;
		gboolean found = FALSE;

		for (list_el = list; list_el; list_el = g_slist_next (list_el))
		{
			/* If the current identifier element is a category (not last)
			 * and this list element is a category.
			 */
			if (id_el[1] && LD_IS_SYMBOL_CATEGORY (list_el->data))
			{
				cat = LD_SYMBOL_CATEGORY (list_el->data);
				if (strcmp (id_el[0], ld_symbol_category_get_name (cat)))
					continue;

				list = ld_symbol_category_get_children (cat);
				found = TRUE;
				break;
			}
			/* If the current identifier element is a symbol (last)
			 * and this list element is a symbol.
			 */
			else if (!id_el[1] && LD_IS_SYMBOL (list_el->data))
			{
				symbol = LD_SYMBOL (list_el->data);
				if (strcmp (id_el[0], ld_symbol_get_name (symbol)))
					continue;

				g_strfreev (id_el_start);
				return symbol;
			}
		}

		if (!found)
			break;
	}
	g_strfreev (id_el_start);
	return NULL;
}

/**
 * ld_library_clear:
 * @self: A symbol library object.
 *
 * Clears all the contents.
 */
void
ld_library_clear (LdLibrary *self)
{
	g_return_if_fail (LD_IS_LIBRARY (self));

	g_slist_foreach (self->priv->children, (GFunc) g_object_unref, NULL);
	g_slist_free (self->priv->children);
	self->priv->children = NULL;

	g_signal_emit (self,
		LD_LIBRARY_GET_CLASS (self)->changed_signal, 0);
}

/**
 * ld_library_insert_child:
 * @self: An #LdLibrary object.
 * @child: The child to be inserted.
 * @pos: The position at which the child will be inserted.
 *       Negative values will append to the end of list.
 *
 * Insert a child into the library.
 */
void
ld_library_insert_child (LdLibrary *self, GObject *child, gint pos)
{
	g_return_if_fail (LD_IS_LIBRARY (self));
	g_return_if_fail (G_IS_OBJECT (child));

	g_object_ref (child);
	self->priv->children = g_slist_insert (self->priv->children, child, pos);
}

/**
 * ld_library_remove_child:
 * @self: An #LdLibrary object.
 * @child: The child to be removed.
 *
 * Removes a child from the library.
 */
void
ld_library_remove_child (LdLibrary *self, GObject *child)
{
	g_return_if_fail (LD_IS_LIBRARY (self));
	g_return_if_fail (G_IS_OBJECT (child));

	if (g_slist_find (self->priv->children, child))
	{
		g_object_unref (child);
		self->priv->children = g_slist_remove (self->priv->children, child);
	}
}

/**
 * ld_library_get_children:
 * @self: An #LdLibrary object.
 *
 * Return value: The internal list of children. Do not modify.
 */
const GSList *
ld_library_get_children (LdLibrary *self)
{
	g_return_val_if_fail (LD_IS_LIBRARY (self), NULL);
	return self->priv->children;
}