1 /* gmarkup.c - Simple XML-like parser
3 * Copyright 2000, 2003 Red Hat, Inc.
4 * Copyright 2007, 2008 Ryan Lortie <desrt@desrt.ca>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this library; if not, see <http://www.gnu.org/licenses/>.
33 #include "gstrfuncs.h"
35 #include "gtestutils.h"
41 * @Title: Simple XML Subset Parser
42 * @Short_description: parses a subset of XML
43 * @See_also: [XML Specification](http://www.w3.org/TR/REC-xml/)
45 * The "GMarkup" parser is intended to parse a simple markup format
46 * that's a subset of XML. This is a small, efficient, easy-to-use
47 * parser. It should not be used if you expect to interoperate with
48 * other applications generating full-scale XML, and must not be used if you
49 * expect to parse untrusted input. However, it's very
50 * useful for application data files, config files, etc. where you
51 * know your application will be the only one writing the file.
52 * Full-scale XML parsers should be able to parse the subset used by
53 * GMarkup, so you can easily migrate to full-scale XML at a later
54 * time if the need arises.
56 * GMarkup is not guaranteed to signal an error on all invalid XML;
57 * the parser may accept documents that an XML parser would not.
58 * However, XML documents which are not well-formed (which is a
59 * weaker condition than being valid. See the
60 * [XML specification](http://www.w3.org/TR/REC-xml/)
61 * for definitions of these terms.) are not considered valid GMarkup
64 * Simplifications to XML include:
66 * - Only UTF-8 encoding is allowed
68 * - No user-defined entities
70 * - Processing instructions, comments and the doctype declaration
71 * are "passed through" but are not interpreted in any way
73 * - No DTD or validation
75 * The markup format does support:
81 * - 5 standard entities: & < > " '
83 * - Character references
85 * - Sections marked as CDATA
88 G_DEFINE_QUARK (g-markup-error-quark, g_markup_error)
93 STATE_AFTER_OPEN_ANGLE,
94 STATE_AFTER_CLOSE_ANGLE,
95 STATE_AFTER_ELISION_SLASH, /* the slash that obviates need for end element */
96 STATE_INSIDE_OPEN_TAG_NAME,
97 STATE_INSIDE_ATTRIBUTE_NAME,
98 STATE_AFTER_ATTRIBUTE_NAME,
99 STATE_BETWEEN_ATTRIBUTES,
100 STATE_AFTER_ATTRIBUTE_EQUALS_SIGN,
101 STATE_INSIDE_ATTRIBUTE_VALUE_SQ,
102 STATE_INSIDE_ATTRIBUTE_VALUE_DQ,
104 STATE_AFTER_CLOSE_TAG_SLASH,
105 STATE_INSIDE_CLOSE_TAG_NAME,
106 STATE_AFTER_CLOSE_TAG_NAME,
107 STATE_INSIDE_PASSTHROUGH,
113 const char *prev_element;
114 const GMarkupParser *prev_parser;
115 gpointer prev_user_data;
116 } GMarkupRecursionTracker;
118 struct _GMarkupParseContext
120 const GMarkupParser *parser;
122 volatile gint ref_count;
124 GMarkupParseFlags flags;
129 GMarkupParseState state;
132 GDestroyNotify dnotify;
134 /* A piece of character data or an element that
135 * hasn't "ended" yet so we haven't yet called
136 * the callback for it.
138 GString *partial_chunk;
139 GSList *spare_chunks;
142 GSList *tag_stack_gstr;
143 GSList *spare_list_nodes;
145 GString **attr_names;
146 GString **attr_values;
150 const gchar *current_text;
151 gssize current_text_len;
152 const gchar *current_text_end;
154 /* used to save the start of the last interesting thingy */
159 guint document_empty : 1;
161 guint awaiting_pop : 1;
164 /* subparser support */
165 GSList *subparser_stack; /* (GMarkupRecursionTracker *) */
166 const char *subparser_element;
167 gpointer held_user_data;
171 * Helpers to reduce our allocation overhead, we have
172 * a well defined allocation lifecycle.
175 get_list_node (GMarkupParseContext *context, gpointer data)
178 if (context->spare_list_nodes != NULL)
180 node = context->spare_list_nodes;
181 context->spare_list_nodes = g_slist_remove_link (context->spare_list_nodes, node);
184 node = g_slist_alloc();
190 free_list_node (GMarkupParseContext *context, GSList *node)
193 context->spare_list_nodes = g_slist_concat (node, context->spare_list_nodes);
197 string_blank (GString *string)
199 string->str[0] = '\0';
204 * g_markup_parse_context_new:
205 * @parser: a #GMarkupParser
206 * @flags: one or more #GMarkupParseFlags
207 * @user_data: user data to pass to #GMarkupParser functions
208 * @user_data_dnotify: user data destroy notifier called when
209 * the parse context is freed
211 * Creates a new parse context. A parse context is used to parse
212 * marked-up documents. You can feed any number of documents into
213 * a context, as long as no errors occur; once an error occurs,
214 * the parse context can't continue to parse text (you have to
215 * free it and create a new parse context).
217 * Returns: a new #GMarkupParseContext
219 GMarkupParseContext *
220 g_markup_parse_context_new (const GMarkupParser *parser,
221 GMarkupParseFlags flags,
223 GDestroyNotify user_data_dnotify)
225 GMarkupParseContext *context;
227 g_return_val_if_fail (parser != NULL, NULL);
229 context = g_new (GMarkupParseContext, 1);
231 context->ref_count = 1;
232 context->parser = parser;
233 context->flags = flags;
234 context->user_data = user_data;
235 context->dnotify = user_data_dnotify;
237 context->line_number = 1;
238 context->char_number = 1;
240 context->partial_chunk = NULL;
241 context->spare_chunks = NULL;
242 context->spare_list_nodes = NULL;
244 context->state = STATE_START;
245 context->tag_stack = NULL;
246 context->tag_stack_gstr = NULL;
247 context->attr_names = NULL;
248 context->attr_values = NULL;
249 context->cur_attr = -1;
250 context->alloc_attrs = 0;
252 context->current_text = NULL;
253 context->current_text_len = -1;
254 context->current_text_end = NULL;
256 context->start = NULL;
257 context->iter = NULL;
259 context->document_empty = TRUE;
260 context->parsing = FALSE;
262 context->awaiting_pop = FALSE;
263 context->subparser_stack = NULL;
264 context->subparser_element = NULL;
266 /* this is only looked at if awaiting_pop = TRUE. initialise anyway. */
267 context->held_user_data = NULL;
269 context->balance = 0;
275 * g_markup_parse_context_ref:
276 * @context: a #GMarkupParseContext
278 * Increases the reference count of @context.
280 * Returns: the same @context
284 GMarkupParseContext *
285 g_markup_parse_context_ref (GMarkupParseContext *context)
287 g_return_val_if_fail (context != NULL, NULL);
288 g_return_val_if_fail (context->ref_count > 0, NULL);
290 g_atomic_int_inc (&context->ref_count);
296 * g_markup_parse_context_unref:
297 * @context: a #GMarkupParseContext
299 * Decreases the reference count of @context. When its reference count
300 * drops to 0, it is freed.
305 g_markup_parse_context_unref (GMarkupParseContext *context)
307 g_return_if_fail (context != NULL);
308 g_return_if_fail (context->ref_count > 0);
310 if (g_atomic_int_dec_and_test (&context->ref_count))
311 g_markup_parse_context_free (context);
315 string_full_free (gpointer ptr)
317 g_string_free (ptr, TRUE);
320 static void clear_attributes (GMarkupParseContext *context);
323 * g_markup_parse_context_free:
324 * @context: a #GMarkupParseContext
326 * Frees a #GMarkupParseContext.
328 * This function can't be called from inside one of the
329 * #GMarkupParser functions or while a subparser is pushed.
332 g_markup_parse_context_free (GMarkupParseContext *context)
334 g_return_if_fail (context != NULL);
335 g_return_if_fail (!context->parsing);
336 g_return_if_fail (!context->subparser_stack);
337 g_return_if_fail (!context->awaiting_pop);
339 if (context->dnotify)
340 (* context->dnotify) (context->user_data);
342 clear_attributes (context);
343 g_free (context->attr_names);
344 g_free (context->attr_values);
346 g_slist_free_full (context->tag_stack_gstr, string_full_free);
347 g_slist_free (context->tag_stack);
349 g_slist_free_full (context->spare_chunks, string_full_free);
350 g_slist_free (context->spare_list_nodes);
352 if (context->partial_chunk)
353 g_string_free (context->partial_chunk, TRUE);
358 static void pop_subparser_stack (GMarkupParseContext *context);
361 mark_error (GMarkupParseContext *context,
364 context->state = STATE_ERROR;
366 if (context->parser->error)
367 (*context->parser->error) (context, error, context->user_data);
369 /* report the error all the way up to free all the user-data */
370 while (context->subparser_stack)
372 pop_subparser_stack (context);
373 context->awaiting_pop = FALSE; /* already been freed */
375 if (context->parser->error)
376 (*context->parser->error) (context, error, context->user_data);
381 set_error (GMarkupParseContext *context,
385 ...) G_GNUC_PRINTF (4, 5);
388 set_error_literal (GMarkupParseContext *context,
391 const gchar *message)
395 tmp_error = g_error_new_literal (G_MARKUP_ERROR, code, message);
397 g_prefix_error (&tmp_error,
398 _("Error on line %d char %d: "),
399 context->line_number,
400 context->char_number);
402 mark_error (context, tmp_error);
404 g_propagate_error (error, tmp_error);
409 set_error (GMarkupParseContext *context,
419 va_start (args, format);
420 s = g_strdup_vprintf (format, args);
423 /* Make sure that the GError message is valid UTF-8
424 * even if it is complaining about invalid UTF-8 in the markup
426 s_valid = g_utf8_make_valid (s, -1);
427 set_error_literal (context, error, code, s);
434 propagate_error (GMarkupParseContext *context,
438 if (context->flags & G_MARKUP_PREFIX_ERROR_POSITION)
439 g_prefix_error (&src,
440 _("Error on line %d char %d: "),
441 context->line_number,
442 context->char_number);
444 mark_error (context, src);
446 g_propagate_error (dest, src);
449 #define IS_COMMON_NAME_END_CHAR(c) \
450 ((c) == '=' || (c) == '/' || (c) == '>' || (c) == ' ')
453 slow_name_validate (GMarkupParseContext *context,
457 const gchar *p = name;
459 if (!g_utf8_validate (name, -1, NULL))
461 set_error (context, error, G_MARKUP_ERROR_BAD_UTF8,
462 _("Invalid UTF-8 encoded text in name — not valid “%s”"), name);
466 if (!(g_ascii_isalpha (*p) ||
467 (!IS_COMMON_NAME_END_CHAR (*p) &&
470 g_unichar_isalpha (g_utf8_get_char (p))))))
472 set_error (context, error, G_MARKUP_ERROR_PARSE,
473 _("“%s” is not a valid name"), name);
477 for (p = g_utf8_next_char (name); *p != '\0'; p = g_utf8_next_char (p))
480 if (!(g_ascii_isalnum (*p) ||
481 (!IS_COMMON_NAME_END_CHAR (*p) &&
486 g_unichar_isalpha (g_utf8_get_char (p))))))
488 set_error (context, error, G_MARKUP_ERROR_PARSE,
489 _("“%s” is not a valid name: “%c”"), name, *p);
497 * Use me for elements, attributes etc.
500 name_validate (GMarkupParseContext *context,
507 /* name start char */
509 if (G_UNLIKELY (IS_COMMON_NAME_END_CHAR (*p) ||
510 !(g_ascii_isalpha (*p) || *p == '_' || *p == ':')))
513 for (mask = *p++; *p != '\0'; p++)
518 if (G_UNLIKELY (!(g_ascii_isalnum (*p) ||
519 (!IS_COMMON_NAME_END_CHAR (*p) &&
527 if (mask & 0x80) /* un-common / non-ascii */
533 return slow_name_validate (context, name, error);
537 text_validate (GMarkupParseContext *context,
542 if (!g_utf8_validate_len (p, len, NULL))
544 set_error (context, error, G_MARKUP_ERROR_BAD_UTF8,
545 _("Invalid UTF-8 encoded text in name — not valid “%s”"), p);
553 char_str (gunichar c,
557 g_unichar_to_utf8 (c, buf);
561 /* Format the next UTF-8 character as a gchar* for printing in error output
562 * when we encounter a syntax error. This correctly handles invalid UTF-8,
563 * emitting it as hex escapes. */
565 utf8_str (const gchar *utf8,
569 gunichar c = g_utf8_get_char_validated (utf8, max_len);
570 if (c == (gunichar) -1 || c == (gunichar) -2)
572 guchar ch = (max_len > 0) ? (guchar) *utf8 : 0;
573 gchar *temp = g_strdup_printf ("\\x%02x", (guint) ch);
575 memcpy (buf, temp, strlen (temp));
585 set_unescape_error (GMarkupParseContext *context,
587 const gchar *remaining_text,
595 gint remaining_newlines;
598 remaining_newlines = 0;
603 ++remaining_newlines;
607 va_start (args, format);
608 s = g_strdup_vprintf (format, args);
611 tmp_error = g_error_new (G_MARKUP_ERROR,
613 _("Error on line %d: %s"),
614 context->line_number - remaining_newlines,
619 mark_error (context, tmp_error);
621 g_propagate_error (error, tmp_error);
625 * re-write the GString in-place, unescaping anything that escaped.
626 * most XML does not contain entities, or escaping.
629 unescape_gstring_inplace (GMarkupParseContext *context,
636 gboolean normalize_attribute;
640 /* are we unescaping an attribute or not ? */
641 if (context->state == STATE_INSIDE_ATTRIBUTE_VALUE_SQ ||
642 context->state == STATE_INSIDE_ATTRIBUTE_VALUE_DQ)
643 normalize_attribute = TRUE;
645 normalize_attribute = FALSE;
648 * Meeks' theorem: unescaping can only shrink text.
649 * for < etc. this is obvious, for  more
650 * thought is required, but this is patently so.
653 for (from = to = string->str; *from != '\0'; from++, to++)
658 if (normalize_attribute && (*to == '\t' || *to == '\n'))
662 *to = normalize_attribute ? ' ' : '\n';
684 l = strtoul (from, &end, base);
686 if (end == from || errno != 0)
688 set_unescape_error (context, error,
689 from, G_MARKUP_ERROR_PARSE,
690 _("Failed to parse “%-.*s”, which "
691 "should have been a digit "
692 "inside a character reference "
693 "(ê for example) — perhaps "
694 "the digit is too large"),
695 (int)(end - from), from);
698 else if (*end != ';')
700 set_unescape_error (context, error,
701 from, G_MARKUP_ERROR_PARSE,
702 _("Character reference did not end with a "
704 "most likely you used an ampersand "
705 "character without intending to start "
706 "an entity — escape ampersand as &"));
711 /* characters XML 1.1 permits */
712 if ((0 < l && l <= 0xD7FF) ||
713 (0xE000 <= l && l <= 0xFFFD) ||
714 (0x10000 <= l && l <= 0x10FFFF))
719 to += strlen (buf) - 1;
721 if (l >= 0x80) /* not ascii */
726 set_unescape_error (context, error,
727 from, G_MARKUP_ERROR_PARSE,
728 _("Character reference “%-.*s” does not "
729 "encode a permitted character"),
730 (int)(end - from), from);
736 else if (strncmp (from, "lt;", 3) == 0)
741 else if (strncmp (from, "gt;", 3) == 0)
746 else if (strncmp (from, "amp;", 4) == 0)
751 else if (strncmp (from, "quot;", 5) == 0)
756 else if (strncmp (from, "apos;", 5) == 0)
764 set_unescape_error (context, error,
765 from, G_MARKUP_ERROR_PARSE,
766 _("Empty entity “&;” seen; valid "
767 "entities are: & " < > '"));
770 const char *end = strchr (from, ';');
772 set_unescape_error (context, error,
773 from, G_MARKUP_ERROR_PARSE,
774 _("Entity name “%-.*s” is not known"),
775 (int)(end - from), from);
777 set_unescape_error (context, error,
778 from, G_MARKUP_ERROR_PARSE,
779 _("Entity did not end with a semicolon; "
780 "most likely you used an ampersand "
781 "character without intending to start "
782 "an entity — escape ampersand as &"));
789 g_assert (to - string->str <= (gssize) string->len);
790 if (to - string->str != (gssize) string->len)
791 g_string_truncate (string, to - string->str);
793 *is_ascii = !(mask & 0x80);
798 static inline gboolean
799 advance_char (GMarkupParseContext *context)
802 context->char_number++;
804 if (G_UNLIKELY (context->iter == context->current_text_end))
807 else if (G_UNLIKELY (*context->iter == '\n'))
809 context->line_number++;
810 context->char_number = 1;
816 static inline gboolean
819 return c == ' ' || c == '\t' || c == '\n' || c == '\r';
823 skip_spaces (GMarkupParseContext *context)
827 if (!xml_isspace (*context->iter))
830 while (advance_char (context));
834 advance_to_name_end (GMarkupParseContext *context)
838 if (IS_COMMON_NAME_END_CHAR (*(context->iter)))
840 if (xml_isspace (*(context->iter)))
843 while (advance_char (context));
847 release_chunk (GMarkupParseContext *context, GString *str)
852 if (str->allocated_len > 256)
853 { /* large strings are unusual and worth freeing */
854 g_string_free (str, TRUE);
858 node = get_list_node (context, str);
859 context->spare_chunks = g_slist_concat (node, context->spare_chunks);
863 add_to_partial (GMarkupParseContext *context,
864 const gchar *text_start,
865 const gchar *text_end)
867 if (context->partial_chunk == NULL)
868 { /* allocate a new chunk to parse into */
870 if (context->spare_chunks != NULL)
872 GSList *node = context->spare_chunks;
873 context->spare_chunks = g_slist_remove_link (context->spare_chunks, node);
874 context->partial_chunk = node->data;
875 free_list_node (context, node);
878 context->partial_chunk = g_string_sized_new (MAX (28, text_end - text_start));
881 if (text_start != text_end)
882 g_string_insert_len (context->partial_chunk, -1,
883 text_start, text_end - text_start);
887 truncate_partial (GMarkupParseContext *context)
889 if (context->partial_chunk != NULL)
890 string_blank (context->partial_chunk);
893 static inline const gchar*
894 current_element (GMarkupParseContext *context)
896 return context->tag_stack->data;
900 pop_subparser_stack (GMarkupParseContext *context)
902 GMarkupRecursionTracker *tracker;
904 g_assert (context->subparser_stack);
906 tracker = context->subparser_stack->data;
908 context->awaiting_pop = TRUE;
909 context->held_user_data = context->user_data;
911 context->user_data = tracker->prev_user_data;
912 context->parser = tracker->prev_parser;
913 context->subparser_element = tracker->prev_element;
914 g_slice_free (GMarkupRecursionTracker, tracker);
916 context->subparser_stack = g_slist_delete_link (context->subparser_stack,
917 context->subparser_stack);
921 push_partial_as_tag (GMarkupParseContext *context)
923 GString *str = context->partial_chunk;
924 /* sadly, this is exported by gmarkup_get_element_stack as-is */
925 context->tag_stack = g_slist_concat (get_list_node (context, str->str), context->tag_stack);
926 context->tag_stack_gstr = g_slist_concat (get_list_node (context, str), context->tag_stack_gstr);
927 context->partial_chunk = NULL;
931 pop_tag (GMarkupParseContext *context)
933 GSList *nodea, *nodeb;
935 nodea = context->tag_stack;
936 nodeb = context->tag_stack_gstr;
937 release_chunk (context, nodeb->data);
938 context->tag_stack = g_slist_remove_link (context->tag_stack, nodea);
939 context->tag_stack_gstr = g_slist_remove_link (context->tag_stack_gstr, nodeb);
940 free_list_node (context, nodea);
941 free_list_node (context, nodeb);
945 possibly_finish_subparser (GMarkupParseContext *context)
947 if (current_element (context) == context->subparser_element)
948 pop_subparser_stack (context);
952 ensure_no_outstanding_subparser (GMarkupParseContext *context)
954 if (context->awaiting_pop)
955 g_critical ("During the first end_element call after invoking a "
956 "subparser you must pop the subparser stack and handle "
957 "the freeing of the subparser user_data. This can be "
958 "done by calling the end function of the subparser. "
959 "Very probably, your program just leaked memory.");
961 /* let valgrind watch the pointer disappear... */
962 context->held_user_data = NULL;
963 context->awaiting_pop = FALSE;
967 current_attribute (GMarkupParseContext *context)
969 g_assert (context->cur_attr >= 0);
970 return context->attr_names[context->cur_attr]->str;
974 add_attribute (GMarkupParseContext *context, GString *str)
976 if (context->cur_attr + 2 >= context->alloc_attrs)
978 context->alloc_attrs += 5; /* silly magic number */
979 context->attr_names = g_realloc (context->attr_names, sizeof(GString*)*context->alloc_attrs);
980 context->attr_values = g_realloc (context->attr_values, sizeof(GString*)*context->alloc_attrs);
983 context->attr_names[context->cur_attr] = str;
984 context->attr_values[context->cur_attr] = NULL;
985 context->attr_names[context->cur_attr+1] = NULL;
986 context->attr_values[context->cur_attr+1] = NULL;
990 clear_attributes (GMarkupParseContext *context)
992 /* Go ahead and free the attributes. */
993 for (; context->cur_attr >= 0; context->cur_attr--)
995 int pos = context->cur_attr;
996 release_chunk (context, context->attr_names[pos]);
997 release_chunk (context, context->attr_values[pos]);
998 context->attr_names[pos] = context->attr_values[pos] = NULL;
1000 g_assert (context->cur_attr == -1);
1001 g_assert (context->attr_names == NULL ||
1002 context->attr_names[0] == NULL);
1003 g_assert (context->attr_values == NULL ||
1004 context->attr_values[0] == NULL);
1007 /* This has to be a separate function to ensure the alloca's
1008 * are unwound on exit - otherwise we grow & blow the stack
1009 * with large documents
1012 emit_start_element (GMarkupParseContext *context,
1016 const gchar *start_name;
1017 const gchar **attr_names;
1018 const gchar **attr_values;
1021 /* In case we want to ignore qualified tags and we see that we have
1022 * one here, we push a subparser. This will ignore all tags inside of
1023 * the qualified tag.
1025 * We deal with the end of the subparser from emit_end_element.
1027 if ((context->flags & G_MARKUP_IGNORE_QUALIFIED) && strchr (current_element (context), ':'))
1029 static const GMarkupParser ignore_parser;
1030 g_markup_parse_context_push (context, &ignore_parser, NULL);
1031 clear_attributes (context);
1035 attr_names = g_newa (const gchar *, context->cur_attr + 2);
1036 attr_values = g_newa (const gchar *, context->cur_attr + 2);
1037 for (i = 0; i < context->cur_attr + 1; i++)
1039 /* Possibly omit qualified attribute names from the list */
1040 if ((context->flags & G_MARKUP_IGNORE_QUALIFIED) && strchr (context->attr_names[i]->str, ':'))
1043 attr_names[j] = context->attr_names[i]->str;
1044 attr_values[j] = context->attr_values[i]->str;
1047 attr_names[j] = NULL;
1048 attr_values[j] = NULL;
1050 /* Call user callback for element start */
1052 start_name = current_element (context);
1054 if (!name_validate (context, start_name, error))
1057 if (context->parser->start_element)
1058 (* context->parser->start_element) (context,
1060 (const gchar **)attr_names,
1061 (const gchar **)attr_values,
1064 clear_attributes (context);
1066 if (tmp_error != NULL)
1067 propagate_error (context, error, tmp_error);
1071 emit_end_element (GMarkupParseContext *context,
1074 /* We need to pop the tag stack and call the end_element
1075 * function, since this is the close tag
1077 GError *tmp_error = NULL;
1079 g_assert (context->tag_stack != NULL);
1081 possibly_finish_subparser (context);
1083 /* We might have just returned from our ignore subparser */
1084 if ((context->flags & G_MARKUP_IGNORE_QUALIFIED) && strchr (current_element (context), ':'))
1086 g_markup_parse_context_pop (context);
1092 if (context->parser->end_element)
1093 (* context->parser->end_element) (context,
1094 current_element (context),
1098 ensure_no_outstanding_subparser (context);
1102 mark_error (context, tmp_error);
1103 g_propagate_error (error, tmp_error);
1110 * g_markup_parse_context_parse:
1111 * @context: a #GMarkupParseContext
1112 * @text: chunk of text to parse
1113 * @text_len: length of @text in bytes
1114 * @error: return location for a #GError
1116 * Feed some data to the #GMarkupParseContext.
1118 * The data need not be valid UTF-8; an error will be signaled if
1119 * it's invalid. The data need not be an entire document; you can
1120 * feed a document into the parser incrementally, via multiple calls
1121 * to this function. Typically, as you receive data from a network
1122 * connection or file, you feed each received chunk of data into this
1123 * function, aborting the process if an error occurs. Once an error
1124 * is reported, no further data may be fed to the #GMarkupParseContext;
1125 * all errors are fatal.
1127 * Returns: %FALSE if an error occurred, %TRUE on success
1130 g_markup_parse_context_parse (GMarkupParseContext *context,
1135 g_return_val_if_fail (context != NULL, FALSE);
1136 g_return_val_if_fail (text != NULL, FALSE);
1137 g_return_val_if_fail (context->state != STATE_ERROR, FALSE);
1138 g_return_val_if_fail (!context->parsing, FALSE);
1141 text_len = strlen (text);
1146 context->parsing = TRUE;
1149 context->current_text = text;
1150 context->current_text_len = text_len;
1151 context->current_text_end = context->current_text + text_len;
1152 context->iter = context->current_text;
1153 context->start = context->iter;
1155 while (context->iter != context->current_text_end)
1157 switch (context->state)
1160 /* Possible next state: AFTER_OPEN_ANGLE */
1162 g_assert (context->tag_stack == NULL);
1164 /* whitespace is ignored outside of any elements */
1165 skip_spaces (context);
1167 if (context->iter != context->current_text_end)
1169 if (*context->iter == '<')
1171 /* Move after the open angle */
1172 advance_char (context);
1174 context->state = STATE_AFTER_OPEN_ANGLE;
1176 /* this could start a passthrough */
1177 context->start = context->iter;
1179 /* document is now non-empty */
1180 context->document_empty = FALSE;
1184 set_error_literal (context,
1186 G_MARKUP_ERROR_PARSE,
1187 _("Document must begin with an element (e.g. <book>)"));
1192 case STATE_AFTER_OPEN_ANGLE:
1193 /* Possible next states: INSIDE_OPEN_TAG_NAME,
1194 * AFTER_CLOSE_TAG_SLASH, INSIDE_PASSTHROUGH
1196 if (*context->iter == '?' ||
1197 *context->iter == '!')
1199 /* include < in the passthrough */
1200 const gchar *openangle = "<";
1201 add_to_partial (context, openangle, openangle + 1);
1202 context->start = context->iter;
1203 context->balance = 1;
1204 context->state = STATE_INSIDE_PASSTHROUGH;
1206 else if (*context->iter == '/')
1209 advance_char (context);
1211 context->state = STATE_AFTER_CLOSE_TAG_SLASH;
1213 else if (!IS_COMMON_NAME_END_CHAR (*(context->iter)))
1215 context->state = STATE_INSIDE_OPEN_TAG_NAME;
1217 /* start of tag name */
1218 context->start = context->iter;
1226 G_MARKUP_ERROR_PARSE,
1227 _("“%s” is not a valid character following "
1228 "a “<” character; it may not begin an "
1230 utf8_str (context->iter,
1231 context->current_text_end - context->iter, buf));
1235 /* The AFTER_CLOSE_ANGLE state is actually sort of
1236 * broken, because it doesn't correspond to a range
1237 * of characters in the input stream as the others do,
1238 * and thus makes things harder to conceptualize
1240 case STATE_AFTER_CLOSE_ANGLE:
1241 /* Possible next states: INSIDE_TEXT, STATE_START */
1242 if (context->tag_stack == NULL)
1244 context->start = NULL;
1245 context->state = STATE_START;
1249 context->start = context->iter;
1250 context->state = STATE_INSIDE_TEXT;
1254 case STATE_AFTER_ELISION_SLASH:
1255 /* Possible next state: AFTER_CLOSE_ANGLE */
1256 if (*context->iter == '>')
1258 /* move after the close angle */
1259 advance_char (context);
1260 context->state = STATE_AFTER_CLOSE_ANGLE;
1261 emit_end_element (context, error);
1269 G_MARKUP_ERROR_PARSE,
1270 _("Odd character “%s”, expected a “>” character "
1271 "to end the empty-element tag “%s”"),
1272 utf8_str (context->iter,
1273 context->current_text_end - context->iter, buf),
1274 current_element (context));
1278 case STATE_INSIDE_OPEN_TAG_NAME:
1279 /* Possible next states: BETWEEN_ATTRIBUTES */
1281 /* if there's a partial chunk then it's the first part of the
1282 * tag name. If there's a context->start then it's the start
1283 * of the tag name in current_text, the partial chunk goes
1284 * before that start though.
1286 advance_to_name_end (context);
1288 if (context->iter == context->current_text_end)
1290 /* The name hasn't necessarily ended. Merge with
1291 * partial chunk, leave state unchanged.
1293 add_to_partial (context, context->start, context->iter);
1297 /* The name has ended. Combine it with the partial chunk
1298 * if any; push it on the stack; enter next state.
1300 add_to_partial (context, context->start, context->iter);
1301 push_partial_as_tag (context);
1303 context->state = STATE_BETWEEN_ATTRIBUTES;
1304 context->start = NULL;
1308 case STATE_INSIDE_ATTRIBUTE_NAME:
1309 /* Possible next states: AFTER_ATTRIBUTE_NAME */
1311 advance_to_name_end (context);
1312 add_to_partial (context, context->start, context->iter);
1314 /* read the full name, if we enter the equals sign state
1315 * then add the attribute to the list (without the value),
1316 * otherwise store a partial chunk to be prepended later.
1318 if (context->iter != context->current_text_end)
1319 context->state = STATE_AFTER_ATTRIBUTE_NAME;
1322 case STATE_AFTER_ATTRIBUTE_NAME:
1323 /* Possible next states: AFTER_ATTRIBUTE_EQUALS_SIGN */
1325 skip_spaces (context);
1327 if (context->iter != context->current_text_end)
1329 /* The name has ended. Combine it with the partial chunk
1330 * if any; push it on the stack; enter next state.
1332 if (!name_validate (context, context->partial_chunk->str, error))
1335 add_attribute (context, context->partial_chunk);
1337 context->partial_chunk = NULL;
1338 context->start = NULL;
1340 if (*context->iter == '=')
1342 advance_char (context);
1343 context->state = STATE_AFTER_ATTRIBUTE_EQUALS_SIGN;
1351 G_MARKUP_ERROR_PARSE,
1352 _("Odd character “%s”, expected a “=” after "
1353 "attribute name “%s” of element “%s”"),
1354 utf8_str (context->iter,
1355 context->current_text_end - context->iter, buf),
1356 current_attribute (context),
1357 current_element (context));
1363 case STATE_BETWEEN_ATTRIBUTES:
1364 /* Possible next states: AFTER_CLOSE_ANGLE,
1365 * AFTER_ELISION_SLASH, INSIDE_ATTRIBUTE_NAME
1367 skip_spaces (context);
1369 if (context->iter != context->current_text_end)
1371 if (*context->iter == '/')
1373 advance_char (context);
1374 context->state = STATE_AFTER_ELISION_SLASH;
1376 else if (*context->iter == '>')
1378 advance_char (context);
1379 context->state = STATE_AFTER_CLOSE_ANGLE;
1381 else if (!IS_COMMON_NAME_END_CHAR (*(context->iter)))
1383 context->state = STATE_INSIDE_ATTRIBUTE_NAME;
1384 /* start of attribute name */
1385 context->start = context->iter;
1393 G_MARKUP_ERROR_PARSE,
1394 _("Odd character “%s”, expected a “>” or “/” "
1395 "character to end the start tag of "
1396 "element “%s”, or optionally an attribute; "
1397 "perhaps you used an invalid character in "
1398 "an attribute name"),
1399 utf8_str (context->iter,
1400 context->current_text_end - context->iter, buf),
1401 current_element (context));
1404 /* If we're done with attributes, invoke
1405 * the start_element callback
1407 if (context->state == STATE_AFTER_ELISION_SLASH ||
1408 context->state == STATE_AFTER_CLOSE_ANGLE)
1409 emit_start_element (context, error);
1413 case STATE_AFTER_ATTRIBUTE_EQUALS_SIGN:
1414 /* Possible next state: INSIDE_ATTRIBUTE_VALUE_[SQ/DQ] */
1416 skip_spaces (context);
1418 if (context->iter != context->current_text_end)
1420 if (*context->iter == '"')
1422 advance_char (context);
1423 context->state = STATE_INSIDE_ATTRIBUTE_VALUE_DQ;
1424 context->start = context->iter;
1426 else if (*context->iter == '\'')
1428 advance_char (context);
1429 context->state = STATE_INSIDE_ATTRIBUTE_VALUE_SQ;
1430 context->start = context->iter;
1438 G_MARKUP_ERROR_PARSE,
1439 _("Odd character “%s”, expected an open quote mark "
1440 "after the equals sign when giving value for "
1441 "attribute “%s” of element “%s”"),
1442 utf8_str (context->iter,
1443 context->current_text_end - context->iter, buf),
1444 current_attribute (context),
1445 current_element (context));
1450 case STATE_INSIDE_ATTRIBUTE_VALUE_SQ:
1451 case STATE_INSIDE_ATTRIBUTE_VALUE_DQ:
1452 /* Possible next states: BETWEEN_ATTRIBUTES */
1456 if (context->state == STATE_INSIDE_ATTRIBUTE_VALUE_SQ)
1467 if (*context->iter == delim)
1470 while (advance_char (context));
1472 if (context->iter == context->current_text_end)
1474 /* The value hasn't necessarily ended. Merge with
1475 * partial chunk, leave state unchanged.
1477 add_to_partial (context, context->start, context->iter);
1482 /* The value has ended at the quote mark. Combine it
1483 * with the partial chunk if any; set it for the current
1486 add_to_partial (context, context->start, context->iter);
1488 g_assert (context->cur_attr >= 0);
1490 if (unescape_gstring_inplace (context, context->partial_chunk, &is_ascii, error) &&
1491 (is_ascii || text_validate (context, context->partial_chunk->str,
1492 context->partial_chunk->len, error)))
1494 /* success, advance past quote and set state. */
1495 context->attr_values[context->cur_attr] = context->partial_chunk;
1496 context->partial_chunk = NULL;
1497 advance_char (context);
1498 context->state = STATE_BETWEEN_ATTRIBUTES;
1499 context->start = NULL;
1502 truncate_partial (context);
1506 case STATE_INSIDE_TEXT:
1507 /* Possible next states: AFTER_OPEN_ANGLE */
1510 if (*context->iter == '<')
1513 while (advance_char (context));
1515 /* The text hasn't necessarily ended. Merge with
1516 * partial chunk, leave state unchanged.
1519 add_to_partial (context, context->start, context->iter);
1521 if (context->iter != context->current_text_end)
1525 /* The text has ended at the open angle. Call the text
1528 if (unescape_gstring_inplace (context, context->partial_chunk, &is_ascii, error) &&
1529 (is_ascii || text_validate (context, context->partial_chunk->str,
1530 context->partial_chunk->len, error)))
1532 GError *tmp_error = NULL;
1534 if (context->parser->text)
1535 (*context->parser->text) (context,
1536 context->partial_chunk->str,
1537 context->partial_chunk->len,
1541 if (tmp_error == NULL)
1543 /* advance past open angle and set state. */
1544 advance_char (context);
1545 context->state = STATE_AFTER_OPEN_ANGLE;
1546 /* could begin a passthrough */
1547 context->start = context->iter;
1550 propagate_error (context, error, tmp_error);
1553 truncate_partial (context);
1557 case STATE_AFTER_CLOSE_TAG_SLASH:
1558 /* Possible next state: INSIDE_CLOSE_TAG_NAME */
1559 if (!IS_COMMON_NAME_END_CHAR (*(context->iter)))
1561 context->state = STATE_INSIDE_CLOSE_TAG_NAME;
1563 /* start of tag name */
1564 context->start = context->iter;
1572 G_MARKUP_ERROR_PARSE,
1573 _("“%s” is not a valid character following "
1574 "the characters “</”; “%s” may not begin an "
1576 utf8_str (context->iter,
1577 context->current_text_end - context->iter, buf),
1578 utf8_str (context->iter,
1579 context->current_text_end - context->iter, buf));
1583 case STATE_INSIDE_CLOSE_TAG_NAME:
1584 /* Possible next state: AFTER_CLOSE_TAG_NAME */
1585 advance_to_name_end (context);
1586 add_to_partial (context, context->start, context->iter);
1588 if (context->iter != context->current_text_end)
1589 context->state = STATE_AFTER_CLOSE_TAG_NAME;
1592 case STATE_AFTER_CLOSE_TAG_NAME:
1593 /* Possible next state: AFTER_CLOSE_TAG_SLASH */
1595 skip_spaces (context);
1597 if (context->iter != context->current_text_end)
1599 GString *close_name;
1601 close_name = context->partial_chunk;
1602 context->partial_chunk = NULL;
1604 if (*context->iter != '>')
1610 G_MARKUP_ERROR_PARSE,
1611 _("“%s” is not a valid character following "
1612 "the close element name “%s”; the allowed "
1613 "character is “>”"),
1614 utf8_str (context->iter,
1615 context->current_text_end - context->iter, buf),
1618 else if (context->tag_stack == NULL)
1622 G_MARKUP_ERROR_PARSE,
1623 _("Element “%s” was closed, no element "
1624 "is currently open"),
1627 else if (strcmp (close_name->str, current_element (context)) != 0)
1631 G_MARKUP_ERROR_PARSE,
1632 _("Element “%s” was closed, but the currently "
1633 "open element is “%s”"),
1635 current_element (context));
1639 advance_char (context);
1640 context->state = STATE_AFTER_CLOSE_ANGLE;
1641 context->start = NULL;
1643 emit_end_element (context, error);
1645 context->partial_chunk = close_name;
1646 truncate_partial (context);
1650 case STATE_INSIDE_PASSTHROUGH:
1651 /* Possible next state: AFTER_CLOSE_ANGLE */
1654 if (*context->iter == '<')
1656 if (*context->iter == '>')
1662 add_to_partial (context, context->start, context->iter);
1663 context->start = context->iter;
1665 str = context->partial_chunk->str;
1666 len = context->partial_chunk->len;
1668 if (str[1] == '?' && str[len - 1] == '?')
1670 if (strncmp (str, "<!--", 4) == 0 &&
1671 strcmp (str + len - 2, "--") == 0)
1673 if (strncmp (str, "<![CDATA[", 9) == 0 &&
1674 strcmp (str + len - 2, "]]") == 0)
1676 if (strncmp (str, "<!DOCTYPE", 9) == 0 &&
1677 context->balance == 0)
1681 while (advance_char (context));
1683 if (context->iter == context->current_text_end)
1685 /* The passthrough hasn't necessarily ended. Merge with
1686 * partial chunk, leave state unchanged.
1688 add_to_partial (context, context->start, context->iter);
1692 /* The passthrough has ended at the close angle. Combine
1693 * it with the partial chunk if any. Call the passthrough
1694 * callback. Note that the open/close angles are
1695 * included in the text of the passthrough.
1697 GError *tmp_error = NULL;
1699 advance_char (context); /* advance past close angle */
1700 add_to_partial (context, context->start, context->iter);
1702 if (context->flags & G_MARKUP_TREAT_CDATA_AS_TEXT &&
1703 strncmp (context->partial_chunk->str, "<![CDATA[", 9) == 0)
1705 if (context->parser->text &&
1706 text_validate (context,
1707 context->partial_chunk->str + 9,
1708 context->partial_chunk->len - 12,
1710 (*context->parser->text) (context,
1711 context->partial_chunk->str + 9,
1712 context->partial_chunk->len - 12,
1716 else if (context->parser->passthrough &&
1717 text_validate (context,
1718 context->partial_chunk->str,
1719 context->partial_chunk->len,
1721 (*context->parser->passthrough) (context,
1722 context->partial_chunk->str,
1723 context->partial_chunk->len,
1727 truncate_partial (context);
1729 if (tmp_error == NULL)
1731 context->state = STATE_AFTER_CLOSE_ANGLE;
1732 context->start = context->iter; /* could begin text */
1735 propagate_error (context, error, tmp_error);
1744 g_assert_not_reached ();
1750 context->parsing = FALSE;
1752 return context->state != STATE_ERROR;
1756 * g_markup_parse_context_end_parse:
1757 * @context: a #GMarkupParseContext
1758 * @error: return location for a #GError
1760 * Signals to the #GMarkupParseContext that all data has been
1761 * fed into the parse context with g_markup_parse_context_parse().
1763 * This function reports an error if the document isn't complete,
1764 * for example if elements are still open.
1766 * Returns: %TRUE on success, %FALSE if an error was set
1769 g_markup_parse_context_end_parse (GMarkupParseContext *context,
1772 g_return_val_if_fail (context != NULL, FALSE);
1773 g_return_val_if_fail (!context->parsing, FALSE);
1774 g_return_val_if_fail (context->state != STATE_ERROR, FALSE);
1776 if (context->partial_chunk != NULL)
1778 g_string_free (context->partial_chunk, TRUE);
1779 context->partial_chunk = NULL;
1782 if (context->document_empty)
1784 set_error_literal (context, error, G_MARKUP_ERROR_EMPTY,
1785 _("Document was empty or contained only whitespace"));
1789 context->parsing = TRUE;
1791 switch (context->state)
1797 case STATE_AFTER_OPEN_ANGLE:
1798 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1799 _("Document ended unexpectedly just after an open angle bracket “<”"));
1802 case STATE_AFTER_CLOSE_ANGLE:
1803 if (context->tag_stack != NULL)
1805 /* Error message the same as for INSIDE_TEXT */
1806 set_error (context, error, G_MARKUP_ERROR_PARSE,
1807 _("Document ended unexpectedly with elements still open — "
1808 "“%s” was the last element opened"),
1809 current_element (context));
1813 case STATE_AFTER_ELISION_SLASH:
1814 set_error (context, error, G_MARKUP_ERROR_PARSE,
1815 _("Document ended unexpectedly, expected to see a close angle "
1816 "bracket ending the tag <%s/>"), current_element (context));
1819 case STATE_INSIDE_OPEN_TAG_NAME:
1820 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1821 _("Document ended unexpectedly inside an element name"));
1824 case STATE_INSIDE_ATTRIBUTE_NAME:
1825 case STATE_AFTER_ATTRIBUTE_NAME:
1826 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1827 _("Document ended unexpectedly inside an attribute name"));
1830 case STATE_BETWEEN_ATTRIBUTES:
1831 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1832 _("Document ended unexpectedly inside an element-opening "
1836 case STATE_AFTER_ATTRIBUTE_EQUALS_SIGN:
1837 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1838 _("Document ended unexpectedly after the equals sign "
1839 "following an attribute name; no attribute value"));
1842 case STATE_INSIDE_ATTRIBUTE_VALUE_SQ:
1843 case STATE_INSIDE_ATTRIBUTE_VALUE_DQ:
1844 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1845 _("Document ended unexpectedly while inside an attribute "
1849 case STATE_INSIDE_TEXT:
1850 g_assert (context->tag_stack != NULL);
1851 set_error (context, error, G_MARKUP_ERROR_PARSE,
1852 _("Document ended unexpectedly with elements still open — "
1853 "“%s” was the last element opened"),
1854 current_element (context));
1857 case STATE_AFTER_CLOSE_TAG_SLASH:
1858 case STATE_INSIDE_CLOSE_TAG_NAME:
1859 case STATE_AFTER_CLOSE_TAG_NAME:
1860 if (context->tag_stack != NULL)
1861 set_error (context, error, G_MARKUP_ERROR_PARSE,
1862 _("Document ended unexpectedly inside the close tag for "
1863 "element “%s”"), current_element (context));
1865 set_error (context, error, G_MARKUP_ERROR_PARSE,
1866 _("Document ended unexpectedly inside the close tag for an "
1867 "unopened element"));
1870 case STATE_INSIDE_PASSTHROUGH:
1871 set_error_literal (context, error, G_MARKUP_ERROR_PARSE,
1872 _("Document ended unexpectedly inside a comment or "
1873 "processing instruction"));
1878 g_assert_not_reached ();
1882 context->parsing = FALSE;
1884 return context->state != STATE_ERROR;
1888 * g_markup_parse_context_get_element:
1889 * @context: a #GMarkupParseContext
1891 * Retrieves the name of the currently open element.
1893 * If called from the start_element or end_element handlers this will
1894 * give the element_name as passed to those functions. For the parent
1895 * elements, see g_markup_parse_context_get_element_stack().
1897 * Returns: the name of the currently open element, or %NULL
1902 g_markup_parse_context_get_element (GMarkupParseContext *context)
1904 g_return_val_if_fail (context != NULL, NULL);
1906 if (context->tag_stack == NULL)
1909 return current_element (context);
1913 * g_markup_parse_context_get_element_stack:
1914 * @context: a #GMarkupParseContext
1916 * Retrieves the element stack from the internal state of the parser.
1918 * The returned #GSList is a list of strings where the first item is
1919 * the currently open tag (as would be returned by
1920 * g_markup_parse_context_get_element()) and the next item is its
1923 * This function is intended to be used in the start_element and
1924 * end_element handlers where g_markup_parse_context_get_element()
1925 * would merely return the name of the element that is being
1928 * Returns: the element stack, which must not be modified
1933 g_markup_parse_context_get_element_stack (GMarkupParseContext *context)
1935 g_return_val_if_fail (context != NULL, NULL);
1936 return context->tag_stack;
1940 * g_markup_parse_context_get_position:
1941 * @context: a #GMarkupParseContext
1942 * @line_number: (nullable): return location for a line number, or %NULL
1943 * @char_number: (nullable): return location for a char-on-line number, or %NULL
1945 * Retrieves the current line number and the number of the character on
1946 * that line. Intended for use in error messages; there are no strict
1947 * semantics for what constitutes the "current" line number other than
1948 * "the best number we could come up with for error messages."
1951 g_markup_parse_context_get_position (GMarkupParseContext *context,
1955 g_return_if_fail (context != NULL);
1958 *line_number = context->line_number;
1961 *char_number = context->char_number;
1965 * g_markup_parse_context_get_user_data:
1966 * @context: a #GMarkupParseContext
1968 * Returns the user_data associated with @context.
1970 * This will either be the user_data that was provided to
1971 * g_markup_parse_context_new() or to the most recent call
1972 * of g_markup_parse_context_push().
1974 * Returns: the provided user_data. The returned data belongs to
1975 * the markup context and will be freed when
1976 * g_markup_parse_context_free() is called.
1981 g_markup_parse_context_get_user_data (GMarkupParseContext *context)
1983 return context->user_data;
1987 * g_markup_parse_context_push:
1988 * @context: a #GMarkupParseContext
1989 * @parser: a #GMarkupParser
1990 * @user_data: user data to pass to #GMarkupParser functions
1992 * Temporarily redirects markup data to a sub-parser.
1994 * This function may only be called from the start_element handler of
1995 * a #GMarkupParser. It must be matched with a corresponding call to
1996 * g_markup_parse_context_pop() in the matching end_element handler
1997 * (except in the case that the parser aborts due to an error).
1999 * All tags, text and other data between the matching tags is
2000 * redirected to the subparser given by @parser. @user_data is used
2001 * as the user_data for that parser. @user_data is also passed to the
2002 * error callback in the event that an error occurs. This includes
2003 * errors that occur in subparsers of the subparser.
2005 * The end tag matching the start tag for which this call was made is
2006 * handled by the previous parser (which is given its own user_data)
2007 * which is why g_markup_parse_context_pop() is provided to allow "one
2008 * last access" to the @user_data provided to this function. In the
2009 * case of error, the @user_data provided here is passed directly to
2010 * the error callback of the subparser and g_markup_parse_context_pop()
2011 * should not be called. In either case, if @user_data was allocated
2012 * then it ought to be freed from both of these locations.
2014 * This function is not intended to be directly called by users
2015 * interested in invoking subparsers. Instead, it is intended to be
2016 * used by the subparsers themselves to implement a higher-level
2019 * As an example, see the following implementation of a simple
2020 * parser that counts the number of tags encountered.
2022 * |[<!-- language="C" -->
2029 * counter_start_element (GMarkupParseContext *context,
2030 * const gchar *element_name,
2031 * const gchar **attribute_names,
2032 * const gchar **attribute_values,
2033 * gpointer user_data,
2036 * CounterData *data = user_data;
2038 * data->tag_count++;
2042 * counter_error (GMarkupParseContext *context,
2044 * gpointer user_data)
2046 * CounterData *data = user_data;
2048 * g_slice_free (CounterData, data);
2051 * static GMarkupParser counter_subparser =
2053 * counter_start_element,
2061 * In order to allow this parser to be easily used as a subparser, the
2062 * following interface is provided:
2064 * |[<!-- language="C" -->
2066 * start_counting (GMarkupParseContext *context)
2068 * CounterData *data = g_slice_new (CounterData);
2070 * data->tag_count = 0;
2071 * g_markup_parse_context_push (context, &counter_subparser, data);
2075 * end_counting (GMarkupParseContext *context)
2077 * CounterData *data = g_markup_parse_context_pop (context);
2080 * result = data->tag_count;
2081 * g_slice_free (CounterData, data);
2087 * The subparser would then be used as follows:
2089 * |[<!-- language="C" -->
2090 * static void start_element (context, element_name, ...)
2092 * if (strcmp (element_name, "count-these") == 0)
2093 * start_counting (context);
2095 * // else, handle other tags...
2098 * static void end_element (context, element_name, ...)
2100 * if (strcmp (element_name, "count-these") == 0)
2101 * g_print ("Counted %d tags\n", end_counting (context));
2103 * // else, handle other tags...
2110 g_markup_parse_context_push (GMarkupParseContext *context,
2111 const GMarkupParser *parser,
2114 GMarkupRecursionTracker *tracker;
2116 tracker = g_slice_new (GMarkupRecursionTracker);
2117 tracker->prev_element = context->subparser_element;
2118 tracker->prev_parser = context->parser;
2119 tracker->prev_user_data = context->user_data;
2121 context->subparser_element = current_element (context);
2122 context->parser = parser;
2123 context->user_data = user_data;
2125 context->subparser_stack = g_slist_prepend (context->subparser_stack,
2130 * g_markup_parse_context_pop:
2131 * @context: a #GMarkupParseContext
2133 * Completes the process of a temporary sub-parser redirection.
2135 * This function exists to collect the user_data allocated by a
2136 * matching call to g_markup_parse_context_push(). It must be called
2137 * in the end_element handler corresponding to the start_element
2138 * handler during which g_markup_parse_context_push() was called.
2139 * You must not call this function from the error callback -- the
2140 * @user_data is provided directly to the callback in that case.
2142 * This function is not intended to be directly called by users
2143 * interested in invoking subparsers. Instead, it is intended to
2144 * be used by the subparsers themselves to implement a higher-level
2147 * Returns: the user data passed to g_markup_parse_context_push()
2152 g_markup_parse_context_pop (GMarkupParseContext *context)
2156 if (!context->awaiting_pop)
2157 possibly_finish_subparser (context);
2159 g_assert (context->awaiting_pop);
2161 context->awaiting_pop = FALSE;
2163 /* valgrind friendliness */
2164 user_data = context->held_user_data;
2165 context->held_user_data = NULL;
2170 #define APPEND_TEXT_AND_SEEK(_str, _start, _end) \
2172 if (_end > _start) \
2173 g_string_append_len (_str, _start, _end - _start); \
2178 * https://www.w3.org/TR/REC-xml/ defines the set of valid
2180 * #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
2182 * That is, from non-ASCII UTF-8 character set, only 0xC27F - 0xC284 and
2183 * 0xC286 - 0xC29F have to be escaped (excluding the surrogate blocks).
2184 * Corresponding Unicode code points are [0x7F-0x84] and [0x86-0x9F].
2186 * So instead of using costly g_utf8_next_char or similar UTF8 functions, it's
2187 * better to read each byte, and make an exception for 0xC2XX.
2190 append_escaped_text (GString *str,
2194 const gchar *p, *pending;
2198 end = text + length;
2200 while (p < end && pending < end)
2202 guchar c = (guchar) *pending;
2207 APPEND_TEXT_AND_SEEK (str, p, pending);
2208 g_string_append (str, "&");
2212 APPEND_TEXT_AND_SEEK (str, p, pending);
2213 g_string_append (str, "<");
2217 APPEND_TEXT_AND_SEEK (str, p, pending);
2218 g_string_append (str, ">");
2222 APPEND_TEXT_AND_SEEK (str, p, pending);
2223 g_string_append (str, "'");
2227 APPEND_TEXT_AND_SEEK (str, p, pending);
2228 g_string_append (str, """);
2232 if ((0x1 <= c && c <= 0x8) ||
2233 (0xb <= c && c <= 0xc) ||
2234 (0xe <= c && c <= 0x1f) ||
2237 APPEND_TEXT_AND_SEEK (str, p, pending);
2238 g_string_append_printf (str, "&#x%x;", c);
2240 /* The utf-8 control characters to escape begins with 0xc2 byte */
2243 gunichar u = g_utf8_get_char (pending);
2245 if ((0x7f < u && u <= 0x84) ||
2246 (0x86 <= u && u <= 0x9f))
2248 APPEND_TEXT_AND_SEEK (str, p, pending);
2249 g_string_append_printf (str, "&#x%x;", u);
2252 * We have appended a two byte character above, which
2253 * is one byte ahead of what we read on every loop.
2254 * Increment to skip 0xc2 and point to the right location.
2268 g_string_append_len (str, p, pending - p);
2271 #undef APPEND_TEXT_AND_SEEK
2274 * g_markup_escape_text:
2275 * @text: some valid UTF-8 text
2276 * @length: length of @text in bytes, or -1 if the text is nul-terminated
2278 * Escapes text so that the markup parser will parse it verbatim.
2279 * Less than, greater than, ampersand, etc. are replaced with the
2280 * corresponding entities. This function would typically be used
2281 * when writing out a file to be parsed with the markup parser.
2283 * Note that this function doesn't protect whitespace and line endings
2284 * from being processed according to the XML rules for normalization
2285 * of line endings and attribute values.
2287 * Note also that this function will produce character references in
2288 * the range of  ...  for all control sequences
2289 * except for tabstop, newline and carriage return. The character
2290 * references in this range are not valid XML 1.0, but they are
2291 * valid XML 1.1 and will be accepted by the GMarkup parser.
2293 * Returns: a newly allocated string with the escaped text
2296 g_markup_escape_text (const gchar *text,
2301 g_return_val_if_fail (text != NULL, NULL);
2304 length = strlen (text);
2306 /* prealloc at least as long as original text */
2307 str = g_string_sized_new (length);
2308 append_escaped_text (str, text, length);
2310 return g_string_free (str, FALSE);
2315 * @format: a printf-style format string
2316 * @after: location to store a pointer to the character after
2317 * the returned conversion. On a %NULL return, returns the
2318 * pointer to the trailing NUL in the string
2320 * Find the next conversion in a printf-style format string.
2321 * Partially based on code from printf-parser.c,
2322 * Copyright (C) 1999-2000, 2002-2003 Free Software Foundation, Inc.
2324 * Returns: pointer to the next conversion in @format,
2325 * or %NULL, if none.
2328 find_conversion (const char *format,
2331 const char *start = format;
2334 while (*start != '\0' && *start != '%')
2351 /* Test for positional argument. */
2352 if (*cp >= '0' && *cp <= '9')
2356 for (np = cp; *np >= '0' && *np <= '9'; np++)
2362 /* Skip the flags. */
2376 /* Skip the field width. */
2381 /* Test for positional argument. */
2382 if (*cp >= '0' && *cp <= '9')
2386 for (np = cp; *np >= '0' && *np <= '9'; np++)
2394 for (; *cp >= '0' && *cp <= '9'; cp++)
2398 /* Skip the precision. */
2404 /* Test for positional argument. */
2405 if (*cp >= '0' && *cp <= '9')
2409 for (np = cp; *np >= '0' && *np <= '9'; np++)
2417 for (; *cp >= '0' && *cp <= '9'; cp++)
2422 /* Skip argument type/size specifiers. */
2423 while (*cp == 'h' ||
2432 /* Skip the conversion character. */
2440 * g_markup_vprintf_escaped:
2441 * @format: printf() style format string
2442 * @args: variable argument list, similar to vprintf()
2444 * Formats the data in @args according to @format, escaping
2445 * all string and character arguments in the fashion
2446 * of g_markup_escape_text(). See g_markup_printf_escaped().
2448 * Returns: newly allocated result from formatting
2449 * operation. Free with g_free().
2453 #pragma GCC diagnostic push
2454 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
2457 g_markup_vprintf_escaped (const gchar *format,
2462 GString *result = NULL;
2463 gchar *output1 = NULL;
2464 gchar *output2 = NULL;
2465 const char *p, *op1, *op2;
2468 /* The technique here, is that we make two format strings that
2469 * have the identical conversions in the identical order to the
2470 * original strings, but differ in the text in-between. We
2471 * then use the normal g_strdup_vprintf() to format the arguments
2472 * with the two new format strings. By comparing the results,
2473 * we can figure out what segments of the output come from
2474 * the original format string, and what from the arguments,
2475 * and thus know what portions of the string to escape.
2477 * For instance, for:
2479 * g_markup_printf_escaped ("%s ate %d apples", "Susan & Fred", 5);
2481 * We form the two format strings "%sX%dX" and %sY%sY". The results
2482 * of formatting with those two strings are
2484 * "%sX%dX" => "Susan & FredX5X"
2485 * "%sY%dY" => "Susan & FredY5Y"
2487 * To find the span of the first argument, we find the first position
2488 * where the two arguments differ, which tells us that the first
2489 * argument formatted to "Susan & Fred". We then escape that
2490 * to "Susan & Fred" and join up with the intermediate portions
2491 * of the format string and the second argument to get
2492 * "Susan & Fred ate 5 apples".
2495 /* Create the two modified format strings
2497 format1 = g_string_new (NULL);
2498 format2 = g_string_new (NULL);
2503 const char *conv = find_conversion (p, &after);
2507 g_string_append_len (format1, conv, after - conv);
2508 g_string_append_c (format1, 'X');
2509 g_string_append_len (format2, conv, after - conv);
2510 g_string_append_c (format2, 'Y');
2515 /* Use them to format the arguments
2517 G_VA_COPY (args2, args);
2519 output1 = g_strdup_vprintf (format1->str, args);
2527 output2 = g_strdup_vprintf (format2->str, args2);
2531 result = g_string_new (NULL);
2533 /* Iterate through the original format string again,
2534 * copying the non-conversion portions and the escaped
2535 * converted arguments to the output string.
2543 const char *output_start;
2544 const char *conv = find_conversion (p, &after);
2547 if (!conv) /* The end, after points to the trailing \0 */
2549 g_string_append_len (result, p, after - p);
2553 g_string_append_len (result, p, conv - p);
2555 while (*op1 == *op2)
2561 escaped = g_markup_escape_text (output_start, op1 - output_start);
2562 g_string_append (result, escaped);
2571 g_string_free (format1, TRUE);
2572 g_string_free (format2, TRUE);
2577 return g_string_free (result, FALSE);
2582 #pragma GCC diagnostic pop
2585 * g_markup_printf_escaped:
2586 * @format: printf() style format string
2587 * @...: the arguments to insert in the format string
2589 * Formats arguments according to @format, escaping
2590 * all string and character arguments in the fashion
2591 * of g_markup_escape_text(). This is useful when you
2592 * want to insert literal strings into XML-style markup
2593 * output, without having to worry that the strings
2594 * might themselves contain markup.
2596 * |[<!-- language="C" -->
2597 * const char *store = "Fortnum & Mason";
2598 * const char *item = "Tea";
2601 * output = g_markup_printf_escaped ("<purchase>"
2602 * "<store>%s</store>"
2608 * Returns: newly allocated result from formatting
2609 * operation. Free with g_free().
2614 g_markup_printf_escaped (const gchar *format, ...)
2619 va_start (args, format);
2620 result = g_markup_vprintf_escaped (format, args);
2627 g_markup_parse_boolean (const char *string,
2630 char const * const falses[] = { "false", "f", "no", "n", "0" };
2631 char const * const trues[] = { "true", "t", "yes", "y", "1" };
2634 for (i = 0; i < G_N_ELEMENTS (falses); i++)
2636 if (g_ascii_strcasecmp (string, falses[i]) == 0)
2645 for (i = 0; i < G_N_ELEMENTS (trues); i++)
2647 if (g_ascii_strcasecmp (string, trues[i]) == 0)
2660 * GMarkupCollectType:
2661 * @G_MARKUP_COLLECT_INVALID: used to terminate the list of attributes
2663 * @G_MARKUP_COLLECT_STRING: collect the string pointer directly from
2664 * the attribute_values[] array. Expects a parameter of type (const
2665 * char **). If %G_MARKUP_COLLECT_OPTIONAL is specified and the
2666 * attribute isn't present then the pointer will be set to %NULL
2667 * @G_MARKUP_COLLECT_STRDUP: as with %G_MARKUP_COLLECT_STRING, but
2668 * expects a parameter of type (char **) and g_strdup()s the
2669 * returned pointer. The pointer must be freed with g_free()
2670 * @G_MARKUP_COLLECT_BOOLEAN: expects a parameter of type (gboolean *)
2671 * and parses the attribute value as a boolean. Sets %FALSE if the
2672 * attribute isn't present. Valid boolean values consist of
2673 * (case-insensitive) "false", "f", "no", "n", "0" and "true", "t",
2675 * @G_MARKUP_COLLECT_TRISTATE: as with %G_MARKUP_COLLECT_BOOLEAN, but
2676 * in the case of a missing attribute a value is set that compares
2677 * equal to neither %FALSE nor %TRUE G_MARKUP_COLLECT_OPTIONAL is
2679 * @G_MARKUP_COLLECT_OPTIONAL: can be bitwise ORed with the other fields.
2680 * If present, allows the attribute not to appear. A default value
2681 * is set depending on what value type is used
2683 * A mixed enumerated type and flags field. You must specify one type
2684 * (string, strdup, boolean, tristate). Additionally, you may optionally
2685 * bitwise OR the type with the flag %G_MARKUP_COLLECT_OPTIONAL.
2687 * It is likely that this enum will be extended in the future to
2688 * support other types.
2692 * g_markup_collect_attributes:
2693 * @element_name: the current tag name
2694 * @attribute_names: the attribute names
2695 * @attribute_values: the attribute values
2696 * @error: a pointer to a #GError or %NULL
2697 * @first_type: the #GMarkupCollectType of the first attribute
2698 * @first_attr: the name of the first attribute
2699 * @...: a pointer to the storage location of the first attribute
2700 * (or %NULL), followed by more types names and pointers, ending
2701 * with %G_MARKUP_COLLECT_INVALID
2703 * Collects the attributes of the element from the data passed to the
2704 * #GMarkupParser start_element function, dealing with common error
2705 * conditions and supporting boolean values.
2707 * This utility function is not required to write a parser but can save
2710 * The @element_name, @attribute_names, @attribute_values and @error
2711 * parameters passed to the start_element callback should be passed
2712 * unmodified to this function.
2714 * Following these arguments is a list of "supported" attributes to collect.
2715 * It is an error to specify multiple attributes with the same name. If any
2716 * attribute not in the list appears in the @attribute_names array then an
2717 * unknown attribute error will result.
2719 * The #GMarkupCollectType field allows specifying the type of collection
2720 * to perform and if a given attribute must appear or is optional.
2722 * The attribute name is simply the name of the attribute to collect.
2724 * The pointer should be of the appropriate type (see the descriptions
2725 * under #GMarkupCollectType) and may be %NULL in case a particular
2726 * attribute is to be allowed but ignored.
2728 * This function deals with issuing errors for missing attributes
2729 * (of type %G_MARKUP_ERROR_MISSING_ATTRIBUTE), unknown attributes
2730 * (of type %G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE) and duplicate
2731 * attributes (of type %G_MARKUP_ERROR_INVALID_CONTENT) as well
2732 * as parse errors for boolean-valued attributes (again of type
2733 * %G_MARKUP_ERROR_INVALID_CONTENT). In all of these cases %FALSE
2734 * will be returned and @error will be set as appropriate.
2736 * Returns: %TRUE if successful
2741 g_markup_collect_attributes (const gchar *element_name,
2742 const gchar **attribute_names,
2743 const gchar **attribute_values,
2745 GMarkupCollectType first_type,
2746 const gchar *first_attr,
2749 GMarkupCollectType type;
2761 va_start (ap, first_attr);
2762 while (type != G_MARKUP_COLLECT_INVALID)
2767 mandatory = !(type & G_MARKUP_COLLECT_OPTIONAL);
2768 type &= (G_MARKUP_COLLECT_OPTIONAL - 1);
2770 /* tristate records a value != TRUE and != FALSE
2771 * for the case where the attribute is missing
2773 if (type == G_MARKUP_COLLECT_TRISTATE)
2776 for (i = 0; attribute_names[i]; i++)
2777 if (i >= 40 || !(collected & (G_GUINT64_CONSTANT(1) << i)))
2778 if (!strcmp (attribute_names[i], attr))
2781 /* ISO C99 only promises that the user can pass up to 127 arguments.
2782 * Subtracting the first 4 arguments plus the final NULL and dividing
2783 * by 3 arguments per collected attribute, we are left with a maximum
2784 * number of supported attributes of (127 - 5) / 3 = 40.
2786 * In reality, nobody is ever going to call us with anywhere close to
2787 * 40 attributes to collect, so it is safe to assume that if i > 40
2788 * then the user has given some invalid or repeated arguments. These
2789 * problems will be caught and reported at the end of the function.
2791 * We know at this point that we have an error, but we don't know
2792 * what error it is, so just continue...
2795 collected |= (G_GUINT64_CONSTANT(1) << i);
2797 value = attribute_values[i];
2799 if (value == NULL && mandatory)
2801 g_set_error (error, G_MARKUP_ERROR,
2802 G_MARKUP_ERROR_MISSING_ATTRIBUTE,
2803 "element '%s' requires attribute '%s'",
2804 element_name, attr);
2812 case G_MARKUP_COLLECT_STRING:
2814 const char **str_ptr;
2816 str_ptr = va_arg (ap, const char **);
2818 if (str_ptr != NULL)
2823 case G_MARKUP_COLLECT_STRDUP:
2827 str_ptr = va_arg (ap, char **);
2829 if (str_ptr != NULL)
2830 *str_ptr = g_strdup (value);
2834 case G_MARKUP_COLLECT_BOOLEAN:
2835 case G_MARKUP_COLLECT_TRISTATE:
2840 bool_ptr = va_arg (ap, gboolean *);
2842 if (bool_ptr != NULL)
2844 if (type == G_MARKUP_COLLECT_TRISTATE)
2845 /* constructivists rejoice!
2846 * neither false nor true...
2850 else /* G_MARKUP_COLLECT_BOOLEAN */
2856 if (!g_markup_parse_boolean (value, va_arg (ap, gboolean *)))
2858 g_set_error (error, G_MARKUP_ERROR,
2859 G_MARKUP_ERROR_INVALID_CONTENT,
2860 "element '%s', attribute '%s', value '%s' "
2861 "cannot be parsed as a boolean value",
2862 element_name, attr, value);
2872 g_assert_not_reached ();
2876 type = va_arg (ap, GMarkupCollectType);
2877 if (type != G_MARKUP_COLLECT_INVALID)
2878 attr = va_arg (ap, const char *);
2882 /* ensure we collected all the arguments */
2883 for (i = 0; attribute_names[i]; i++)
2884 if ((collected & (G_GUINT64_CONSTANT(1) << i)) == 0)
2886 /* attribute not collected: could be caused by two things.
2888 * 1) it doesn't exist in our list of attributes
2889 * 2) it existed but was matched by a duplicate attribute earlier
2895 for (j = 0; j < i; j++)
2896 if (strcmp (attribute_names[i], attribute_names[j]) == 0)
2900 /* j is now the first occurrence of attribute_names[i] */
2902 g_set_error (error, G_MARKUP_ERROR,
2903 G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE,
2904 "attribute '%s' invalid for element '%s'",
2905 attribute_names[i], element_name);
2907 g_set_error (error, G_MARKUP_ERROR,
2908 G_MARKUP_ERROR_INVALID_CONTENT,
2909 "attribute '%s' given multiple times for element '%s'",
2910 attribute_names[i], element_name);
2918 /* replay the above to free allocations */
2922 va_start (ap, first_attr);
2923 while (type != G_MARKUP_COLLECT_INVALID)
2927 ptr = va_arg (ap, gpointer);
2931 switch (type & (G_MARKUP_COLLECT_OPTIONAL - 1))
2933 case G_MARKUP_COLLECT_STRDUP:
2935 g_free (*(char **) ptr);
2936 *(char **) ptr = NULL;
2939 case G_MARKUP_COLLECT_STRING:
2940 *(char **) ptr = NULL;
2943 case G_MARKUP_COLLECT_BOOLEAN:
2944 *(gboolean *) ptr = FALSE;
2947 case G_MARKUP_COLLECT_TRISTATE:
2948 *(gboolean *) ptr = -1;
2953 type = va_arg (ap, GMarkupCollectType);
2954 if (type != G_MARKUP_COLLECT_INVALID)
2955 attr = va_arg (ap, const char *);