obt/xml.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    obt/xml.c for the Openbox window manager
   4    Copyright (c) 2003-2007   Dana Jansens
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    See the COPYING file for a copy of the GNU General Public License.
  17 */
  18
  19 #include "obt/xml.h"
  20 #include "obt/paths.h"
  21
  22 #include <libxml/xinclude.h>
  23 #include <glib.h>
  24
  25 #ifdef HAVE_STDLIB_H
  26 #  include <stdlib.h>
  27 #endif
  28 #ifdef HAVE_SYS_STAT_H
  29 #  include <sys/stat.h>
  30 #endif
  31 #ifdef HAVE_SYS_TYPES_H
  32 #  include <sys/types.h>
  33 #endif
  34 #ifdef HAVE_UNISTD_H
  35 #  include <unistd.h>
  36 #endif
  37
  38 struct Callback {
  39     gchar *tag;
  40     ObtXmlCallback func;
  41     gpointer data;
  42 };
  43
  44 struct _ObtXmlInst {
  45     gint ref;
  46     ObtPaths *xdg_paths;
  47     GHashTable *callbacks;
  48     xmlDocPtr doc;
  49     xmlNodePtr root;
  50     gchar *path;
  51     gchar *last_error_file;
  52     gint last_error_line;
  53     gchar *last_error_message;
  54 };
  55
  56 static void obt_xml_save_last_error(ObtXmlInst* inst);
  57
  58 static void destfunc(struct Callback *c)
  59 {
  60     g_free(c->tag);
  61     g_slice_free(struct Callback, c);
  62 }
  63
  64 ObtXmlInst* obt_xml_instance_new(void)
  65 {
  66     ObtXmlInst *i = g_slice_new(ObtXmlInst);
  67     i->ref = 1;
  68     i->xdg_paths = obt_paths_new();
  69     i->callbacks = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
  70                                          (GDestroyNotify)destfunc);
  71     i->doc = NULL;
  72     i->root = NULL;
  73     i->path = NULL;
  74     i->last_error_file = NULL;
  75     i->last_error_line = -1;
  76     i->last_error_message = NULL;
  77     return i;
  78 }
  79
  80 void obt_xml_instance_ref(ObtXmlInst *i)
  81 {
  82     ++i->ref;
  83 }
  84
  85 void obt_xml_instance_unref(ObtXmlInst *i)
  86 {
  87     if (i && --i->ref == 0) {
  88         obt_paths_unref(i->xdg_paths);
  89         g_hash_table_destroy(i->callbacks);
  90         g_free(i->last_error_file);
  91         g_free(i->last_error_message);
  92         g_slice_free(ObtXmlInst, i);
  93     }
  94 }
  95
  96 xmlDocPtr obt_xml_doc(ObtXmlInst *i)
  97 {
  98     g_assert(i->doc); /* a doc is open? */
  99     return i->doc;
 100 }
 101
 102 xmlNodePtr obt_xml_root(ObtXmlInst *i)
 103 {
 104     g_assert(i->doc); /* a doc is open? */
 105     return i->root;
 106 }
 107
 108 void obt_xml_register(ObtXmlInst *i, const gchar *tag,
 109                       ObtXmlCallback func, gpointer data)
 110 {
 111     struct Callback *c;
 112
 113     if (g_hash_table_lookup(i->callbacks, tag)) {
 114         g_error("Tag '%s' already registered", tag);
 115         return;
 116     }
 117
 118     c = g_slice_new(struct Callback);
 119     c->tag = g_strdup(tag);
 120     c->func = func;
 121     c->data = data;
 122     g_hash_table_insert(i->callbacks, c->tag, c);
 123 }
 124
 125 void obt_xml_unregister(ObtXmlInst *i, const gchar *tag)
 126 {
 127     g_hash_table_remove(i->callbacks, tag);
 128 }
 129
 130 static gboolean load_file(ObtXmlInst *i,
 131                           const gchar *domain,
 132                           const gchar *filename,
 133                           const gchar *root_node,
 134                           GSList *paths)
 135 {
 136     GSList *it;
 137     gboolean r = FALSE;
 138
 139     g_assert(i->doc == NULL); /* another doc isn't open already? */
 140
 141     xmlResetLastError();
 142
 143     for (it = paths; !r && it; it = g_slist_next(it)) {
 144         gchar *path;
 145         struct stat s;
 146
 147         if (!domain && !filename) /* given a full path to the file */
 148             path = g_strdup(it->data);
 149         else
 150             path = g_build_filename(it->data, domain, filename, NULL);
 151
 152         if (stat(path, &s) >= 0) {
 153             /* XML_PARSE_BLANKS is needed apparently, or the tree can end up
 154                with extra nodes in it. */
 155             i->doc = xmlReadFile(path, NULL, (XML_PARSE_NOBLANKS |
 156                                               XML_PARSE_RECOVER));
 157             xmlXIncludeProcessFlags(i->doc, (XML_PARSE_NOBLANKS |
 158                                              XML_PARSE_RECOVER));
 159             if (i->doc) {
 160                 i->root = xmlDocGetRootElement(i->doc);
 161                 if (!i->root) {
 162                     xmlFreeDoc(i->doc);
 163                     i->doc = NULL;
 164                     g_message("%s is an empty XML document", path);
 165                 }
 166                 else if (xmlStrcmp(i->root->name,
 167                                    (const xmlChar*)root_node)) {
 168                     xmlFreeDoc(i->doc);
 169                     i->doc = NULL;
 170                     i->root = NULL;
 171                     g_message("XML document %s is of wrong type. Root "
 172                               "node is not '%s'", path, root_node);
 173                 }
 174                 else {
 175                     i->path = g_strdup(path);
 176                     r = TRUE; /* ok! */
 177                 }
 178             }
 179         }
 180
 181         g_free(path);
 182     }
 183
 184     obt_xml_save_last_error(i);
 185
 186     return r;
 187 }
 188
 189 gboolean obt_xml_load_file(ObtXmlInst *i,
 190                            const gchar *path,
 191                            const gchar *root_node)
 192 {
 193     GSList *paths;
 194     gboolean r;
 195
 196     paths = g_slist_append(NULL, g_strdup(path));
 197
 198     r = load_file(i, NULL, NULL, root_node, paths);
 199
 200     while (paths) {
 201         g_free(paths->data);
 202         paths = g_slist_delete_link(paths, paths);
 203     }
 204     return r;
 205 }
 206
 207 gboolean obt_xml_load_config_file(ObtXmlInst *i,
 208                                   const gchar *domain,
 209                                   const gchar *filename,
 210                                   const gchar *root_node)
 211 {
 212     GSList *it, *paths = NULL;
 213     gboolean r;
 214
 215     for (it = obt_paths_config_dirs(i->xdg_paths); it; it = g_slist_next(it))
 216         paths = g_slist_append(paths, g_strdup(it->data));
 217
 218     r = load_file(i, domain, filename, root_node, paths);
 219
 220     while (paths) {
 221         g_free(paths->data);
 222         paths = g_slist_delete_link(paths, paths);
 223     }
 224     return r;
 225 }
 226
 227 gboolean obt_xml_load_data_file(ObtXmlInst *i,
 228                                 const gchar *domain,
 229                                 const gchar *filename,
 230                                 const gchar *root_node)
 231 {
 232     GSList *it, *paths = NULL;
 233     gboolean r;
 234
 235     for (it = obt_paths_data_dirs(i->xdg_paths); it; it = g_slist_next(it))
 236         paths = g_slist_append(paths, g_strdup(it->data));
 237
 238     r = load_file(i, domain, filename, root_node, paths);
 239
 240     while (paths) {
 241         g_free(paths->data);
 242         paths = g_slist_delete_link(paths, paths);
 243     }
 244     return r;
 245 }
 246
 247 gboolean obt_xml_load_theme_file(ObtXmlInst *i,
 248                                  const gchar *theme,
 249                                  const gchar *domain,
 250                                  const gchar *filename,
 251                                  const gchar *root_node)
 252 {
 253     GSList *it, *paths = NULL;
 254     gboolean r;
 255
 256     /* use ~/.themes for backwards compatibility */
 257     paths = g_slist_append
 258         (paths, g_build_filename(g_get_home_dir(), ".themes", theme, NULL));
 259
 260     for (it = obt_paths_data_dirs(i->xdg_paths); it; it = g_slist_next(it))
 261         paths = g_slist_append
 262             (paths, g_build_filename(it->data, "themes", theme, NULL));
 263
 264     r = load_file(i, domain, filename, root_node, paths);
 265
 266     while (paths) {
 267         g_free(paths->data);
 268         paths = g_slist_delete_link(paths, paths);
 269     }
 270     return r;
 271 }
 272
 273
 274 gboolean obt_xml_load_mem(ObtXmlInst *i,
 275                           gpointer data, guint len, const gchar *root_node)
 276 {
 277     gboolean r = FALSE;
 278
 279     g_assert(i->doc == NULL); /* another doc isn't open already? */
 280
 281     xmlResetLastError();
 282
 283     i->doc = xmlParseMemory(data, len);
 284     if (i->doc) {
 285         i->root = xmlDocGetRootElement(i->doc);
 286         if (!i->root) {
 287             xmlFreeDoc(i->doc);
 288             i->doc = NULL;
 289             g_message("Given memory is an empty document");
 290         }
 291         else if (xmlStrcmp(i->root->name, (const xmlChar*)root_node)) {
 292             xmlFreeDoc(i->doc);
 293             i->doc = NULL;
 294             i->root = NULL;
 295             g_message("XML Document in given memory is of wrong "
 296                       "type. Root node is not '%s'\n", root_node);
 297         }
 298         else
 299             r = TRUE; /* ok ! */
 300     }
 301
 302     obt_xml_save_last_error(i);
 303
 304     return r;
 305 }
 306
 307 static void obt_xml_save_last_error(ObtXmlInst* inst)
 308 {
 309     xmlErrorPtr error = xmlGetLastError();
 310     if (error) {
 311         inst->last_error_file = g_strdup(error->file);
 312         inst->last_error_line = error->line;
 313         inst->last_error_message = g_strdup(error->message);
 314         xmlResetError(error);
 315     }
 316 }
 317
 318 gboolean obt_xml_last_error(ObtXmlInst *inst)
 319 {
 320     return inst->last_error_file &&
 321         inst->last_error_line >= 0 &&
 322         inst->last_error_message;
 323 }
 324
 325 gchar* obt_xml_last_error_file(ObtXmlInst *inst)
 326 {
 327     if (!obt_xml_last_error(inst))
 328         return NULL;
 329     return inst->last_error_file;
 330 }
 331
 332 gint obt_xml_last_error_line(ObtXmlInst *inst)
 333 {
 334     if (!obt_xml_last_error(inst))
 335         return -1;
 336     return inst->last_error_line;
 337 }
 338
 339 gchar* obt_xml_last_error_message(ObtXmlInst *inst)
 340 {
 341     if (!obt_xml_last_error(inst))
 342         return NULL;
 343     return inst->last_error_message;
 344 }
 345
 346 gboolean obt_xml_save_file(ObtXmlInst *inst,
 347                            const gchar *path,
 348                            gboolean pretty)
 349 {
 350     return xmlSaveFormatFile(path, inst->doc, pretty) != -1;
 351 }
 352
 353 void obt_xml_close(ObtXmlInst *i)
 354 {
 355     if (i && i->doc) {
 356         xmlFreeDoc(i->doc);
 357         g_free(i->path);
 358         i->doc = NULL;
 359         i->root = NULL;
 360         i->path = NULL;
 361     }
 362 }
 363
 364 void obt_xml_tree(ObtXmlInst *i, xmlNodePtr node)
 365 {
 366     g_assert(i->doc); /* a doc is open? */
 367
 368     while (node) {
 369         if (node->name) {
 370             struct Callback *c = g_hash_table_lookup(i->callbacks, node->name);
 371             if (c) c->func(node, c->data);
 372         }
 373         node = node->next;
 374     }
 375 }
 376
 377 void obt_xml_tree_from_root(ObtXmlInst *i)
 378 {
 379     obt_xml_tree(i, i->root->children);
 380 }
 381
 382 gchar *obt_xml_node_string_unstripped(xmlNodePtr node)
 383 {
 384     xmlChar *c = xmlNodeGetContent(node);
 385     gchar *s;
 386     s = g_strdup(c ? (gchar*)c : "");
 387     xmlFree(c);
 388     return s;
 389 }
 390
 391 gchar *obt_xml_node_string(xmlNodePtr node)
 392 {
 393     gchar* result = obt_xml_node_string_unstripped(node);
 394     g_strstrip(result); /* strip leading/trailing whitespace */
 395     return result;
 396 }
 397
 398 gint obt_xml_node_int(xmlNodePtr node)
 399 {
 400     xmlChar *c = xmlNodeGetContent(node);
 401     gint i;
 402     if (c) g_strstrip((char*)c); /* strip leading/trailing whitespace */
 403     i = c ? atoi((gchar*)c) : 0;
 404     xmlFree(c);
 405     return i;
 406 }
 407
 408 gboolean obt_xml_node_bool(xmlNodePtr node)
 409 {
 410     xmlChar *c = xmlNodeGetContent(node);
 411     gboolean b = FALSE;
 412     if (c) g_strstrip((char*)c); /* strip leading/trailing whitespace */
 413     if (c && !xmlStrcasecmp(c, (const xmlChar*) "true"))
 414         b = TRUE;
 415     else if (c && !xmlStrcasecmp(c, (const xmlChar*) "yes"))
 416         b = TRUE;
 417     else if (c && !xmlStrcasecmp(c, (const xmlChar*) "on"))
 418         b = TRUE;
 419     xmlFree(c);
 420     return b;
 421 }
 422
 423 gboolean obt_xml_node_contains(xmlNodePtr node, const gchar *val)
 424 {
 425     xmlChar *c = xmlNodeGetContent(node);
 426     gboolean r;
 427     if (c) g_strstrip((char*)c); /* strip leading/trailing whitespace */
 428     r = !xmlStrcasecmp(c, (const xmlChar*) val);
 429     xmlFree(c);
 430     return r;
 431 }
 432
 433 xmlNodePtr obt_xml_find_node(xmlNodePtr node, const gchar *tag)
 434 {
 435     while (node) {
 436         if (!xmlStrcmp(node->name, (const xmlChar*) tag))
 437             return node;
 438         node = node->next;
 439     }
 440     return NULL;
 441 }
 442
 443 gboolean obt_xml_attr_bool(xmlNodePtr node, const gchar *name,
 444                            gboolean *value)
 445 {
 446     xmlChar *c = xmlGetProp(node, (const xmlChar*) name);
 447     gboolean r = FALSE;
 448     if (c) {
 449         g_strstrip((char*)c); /* strip leading/trailing whitespace */
 450         if (!xmlStrcasecmp(c, (const xmlChar*) "true"))
 451             *value = TRUE, r = TRUE;
 452         else if (!xmlStrcasecmp(c, (const xmlChar*) "yes"))
 453             *value = TRUE, r = TRUE;
 454         else if (!xmlStrcasecmp(c, (const xmlChar*) "on"))
 455             *value = TRUE, r = TRUE;
 456         else if (!xmlStrcasecmp(c, (const xmlChar*) "false"))
 457             *value = FALSE, r = TRUE;
 458         else if (!xmlStrcasecmp(c, (const xmlChar*) "no"))
 459             *value = FALSE, r = TRUE;
 460         else if (!xmlStrcasecmp(c, (const xmlChar*) "off"))
 461             *value = FALSE, r = TRUE;
 462     }
 463     xmlFree(c);
 464     return r;
 465 }
 466
 467 gboolean obt_xml_attr_int(xmlNodePtr node, const gchar *name, gint *value)
 468 {
 469     xmlChar *c = xmlGetProp(node, (const xmlChar*) name);
 470     gboolean r = FALSE;
 471     if (c) {
 472         g_strstrip((char*)c); /* strip leading/trailing whitespace */
 473         *value = atoi((gchar*)c);
 474         r = TRUE;
 475     }
 476     xmlFree(c);
 477     return r;
 478 }
 479
 480 gboolean obt_xml_attr_string_unstripped(xmlNodePtr node, const gchar *name,
 481                                         gchar **value)
 482 {
 483     xmlChar *c = xmlGetProp(node, (const xmlChar*) name);
 484     gboolean r = FALSE;
 485     if (c) {
 486         *value = g_strdup((gchar*)c);
 487         r = TRUE;
 488     }
 489     xmlFree(c);
 490     return r;
 491 }
 492
 493 gboolean obt_xml_attr_string(xmlNodePtr node, const gchar *name,
 494                              gchar **value)
 495 {
 496     gboolean result = obt_xml_attr_string_unstripped(node, name, value);
 497     if (result)
 498         g_strstrip(*value); /* strip leading/trailing whitespace */
 499     return result;
 500 }
 501
 502 gboolean obt_xml_attr_contains(xmlNodePtr node, const gchar *name,
 503                                const gchar *val)
 504 {
 505     xmlChar *c = xmlGetProp(node, (const xmlChar*) name);
 506     gboolean r = FALSE;
 507     if (c) {
 508         g_strstrip((char*)c); /* strip leading/trailing whitespace */
 509         r = !xmlStrcasecmp(c, (const xmlChar*) val);
 510     }
 511     xmlFree(c);
 512     return r;
 513 }