glib/gmarkup.h

   1 /* gmarkup.h - Simple XML-like string parser/writer
   2  *
   3  *  Copyright 2000 Red Hat, Inc.
   4  *
   5  * GLib is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * GLib is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with GLib; see the file COPYING.LIB.  If not,
  17  * see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef __G_MARKUP_H__
  21 #define __G_MARKUP_H__
  22
  23 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  24 #error "Only <glib.h> can be included directly."
  25 #endif
  26
  27 #include <stdarg.h>
  28
  29 #include <glib/gerror.h>
  30 #include <glib/gslist.h>
  31
  32 G_BEGIN_DECLS
  33
  34 /**
  35  * GMarkupError:
  36  * @G_MARKUP_ERROR_BAD_UTF8: text being parsed was not valid UTF-8
  37  * @G_MARKUP_ERROR_EMPTY: document contained nothing, or only whitespace
  38  * @G_MARKUP_ERROR_PARSE: document was ill-formed
  39  * @G_MARKUP_ERROR_UNKNOWN_ELEMENT: error should be set by #GMarkupParser
  40  *     functions; element wasn't known
  41  * @G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE: error should be set by #GMarkupParser
  42  *     functions; attribute wasn't known
  43  * @G_MARKUP_ERROR_INVALID_CONTENT: error should be set by #GMarkupParser
  44  *     functions; content was invalid
  45  * @G_MARKUP_ERROR_MISSING_ATTRIBUTE: error should be set by #GMarkupParser
  46  *     functions; a required attribute was missing
  47  *
  48  * Error codes returned by markup parsing.
  49  */
  50 typedef enum
  51 {
  52   G_MARKUP_ERROR_BAD_UTF8,
  53   G_MARKUP_ERROR_EMPTY,
  54   G_MARKUP_ERROR_PARSE,
  55   /* The following are primarily intended for specific GMarkupParser
  56    * implementations to set.
  57    */
  58   G_MARKUP_ERROR_UNKNOWN_ELEMENT,
  59   G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE,
  60   G_MARKUP_ERROR_INVALID_CONTENT,
  61   G_MARKUP_ERROR_MISSING_ATTRIBUTE
  62 } GMarkupError;
  63
  64 /**
  65  * G_MARKUP_ERROR:
  66  *
  67  * Error domain for markup parsing.
  68  * Errors in this domain will be from the #GMarkupError enumeration.
  69  * See #GError for information on error domains.
  70  */
  71 #define G_MARKUP_ERROR g_markup_error_quark ()
  72
  73 GLIB_AVAILABLE_IN_ALL
  74 GQuark g_markup_error_quark (void);
  75
  76 /**
  77  * GMarkupParseFlags:
  78  * @G_MARKUP_DO_NOT_USE_THIS_UNSUPPORTED_FLAG: flag you should not use
  79  * @G_MARKUP_TREAT_CDATA_AS_TEXT: When this flag is set, CDATA marked
  80  *     sections are not passed literally to the @passthrough function of
  81  *     the parser. Instead, the content of the section (without the
  82  *     `<![CDATA[` and `]]>`) is
  83  *     passed to the @text function. This flag was added in GLib 2.12
  84  * @G_MARKUP_PREFIX_ERROR_POSITION: Normally errors caught by GMarkup
  85  *     itself have line/column information prefixed to them to let the
  86  *     caller know the location of the error. When this flag is set the
  87  *     location information is also prefixed to errors generated by the
  88  *     #GMarkupParser implementation functions
  89  * @G_MARKUP_IGNORE_QUALIFIED: Ignore (don't report) qualified
  90  *     attributes and tags, along with their contents.  A qualified
  91  *     attribute or tag is one that contains ':' in its name (ie: is in
  92  *     another namespace).  Since: 2.40.
  93  *
  94  * Flags that affect the behaviour of the parser.
  95  */
  96 typedef enum
  97 {
  98   G_MARKUP_DO_NOT_USE_THIS_UNSUPPORTED_FLAG = 1 << 0,
  99   G_MARKUP_TREAT_CDATA_AS_TEXT              = 1 << 1,
 100   G_MARKUP_PREFIX_ERROR_POSITION            = 1 << 2,
 101   G_MARKUP_IGNORE_QUALIFIED                 = 1 << 3
 102 } GMarkupParseFlags;
 103
 104 /**
 105  * GMarkupParseContext:
 106  *
 107  * A parse context is used to parse a stream of bytes that
 108  * you expect to contain marked-up text.
 109  *
 110  * See g_markup_parse_context_new(), #GMarkupParser, and so
 111  * on for more details.
 112  */
 113 typedef struct _GMarkupParseContext GMarkupParseContext;
 114 typedef struct _GMarkupParser GMarkupParser;
 115
 116 /**
 117  * GMarkupParser:
 118  * @start_element: Callback to invoke when the opening tag of an element
 119  *     is seen. The callback's @attribute_names and @attribute_values parameters
 120  *     are %NULL-terminated.
 121  * @end_element: Callback to invoke when the closing tag of an element
 122  *     is seen. Note that this is also called for empty tags like
 123  *     `<empty/>`.
 124  * @text: Callback to invoke when some text is seen (text is always
 125  *     inside an element). Note that the text of an element may be spread
 126  *     over multiple calls of this function. If the
 127  *     %G_MARKUP_TREAT_CDATA_AS_TEXT flag is set, this function is also
 128  *     called for the content of CDATA marked sections.
 129  * @passthrough: Callback to invoke for comments, processing instructions
 130  *     and doctype declarations; if you're re-writing the parsed document,
 131  *     write the passthrough text back out in the same position. If the
 132  *     %G_MARKUP_TREAT_CDATA_AS_TEXT flag is not set, this function is also
 133  *     called for CDATA marked sections.
 134  * @error: Callback to invoke when an error occurs.
 135  *
 136  * Any of the fields in #GMarkupParser can be %NULL, in which case they
 137  * will be ignored. Except for the @error function, any of these callbacks
 138  * can set an error; in particular the %G_MARKUP_ERROR_UNKNOWN_ELEMENT,
 139  * %G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE, and %G_MARKUP_ERROR_INVALID_CONTENT
 140  * errors are intended to be set from these callbacks. If you set an error
 141  * from a callback, g_markup_parse_context_parse() will report that error
 142  * back to its caller.
 143  */
 144 struct _GMarkupParser
 145 {
 146   /* Called for open tags <foo bar="baz"> */
 147   void (*start_element)  (GMarkupParseContext *context,
 148                           const gchar         *element_name,
 149                           const gchar        **attribute_names,
 150                           const gchar        **attribute_values,
 151                           gpointer             user_data,
 152                           GError             **error);
 153
 154   /* Called for close tags </foo> */
 155   void (*end_element)    (GMarkupParseContext *context,
 156                           const gchar         *element_name,
 157                           gpointer             user_data,
 158                           GError             **error);
 159
 160   /* Called for character data */
 161   /* text is not nul-terminated */
 162   void (*text)           (GMarkupParseContext *context,
 163                           const gchar         *text,
 164                           gsize                text_len,
 165                           gpointer             user_data,
 166                           GError             **error);
 167
 168   /* Called for strings that should be re-saved verbatim in this same
 169    * position, but are not otherwise interpretable.  At the moment
 170    * this includes comments and processing instructions.
 171    */
 172   /* text is not nul-terminated. */
 173   void (*passthrough)    (GMarkupParseContext *context,
 174                           const gchar         *passthrough_text,
 175                           gsize                text_len,
 176                           gpointer             user_data,
 177                           GError             **error);
 178
 179   /* Called on error, including one set by other
 180    * methods in the vtable. The GError should not be freed.
 181    */
 182   void (*error)          (GMarkupParseContext *context,
 183                           GError              *error,
 184                           gpointer             user_data);
 185 };
 186
 187 GLIB_AVAILABLE_IN_ALL
 188 GMarkupParseContext *g_markup_parse_context_new   (const GMarkupParser *parser,
 189                                                    GMarkupParseFlags    flags,
 190                                                    gpointer             user_data,
 191                                                    GDestroyNotify       user_data_dnotify);
 192 GLIB_AVAILABLE_IN_2_36
 193 GMarkupParseContext *g_markup_parse_context_ref   (GMarkupParseContext *context);
 194 GLIB_AVAILABLE_IN_2_36
 195 void                 g_markup_parse_context_unref (GMarkupParseContext *context);
 196 GLIB_AVAILABLE_IN_ALL
 197 void                 g_markup_parse_context_free  (GMarkupParseContext *context);
 198 GLIB_AVAILABLE_IN_ALL
 199 gboolean             g_markup_parse_context_parse (GMarkupParseContext *context,
 200                                                    const gchar         *text,
 201                                                    gssize               text_len,
 202                                                    GError             **error);
 203 GLIB_AVAILABLE_IN_ALL
 204 void                 g_markup_parse_context_push  (GMarkupParseContext *context,
 205                                                    const GMarkupParser *parser,
 206                                                    gpointer             user_data);
 207 GLIB_AVAILABLE_IN_ALL
 208 gpointer             g_markup_parse_context_pop   (GMarkupParseContext *context);
 209
 210 GLIB_AVAILABLE_IN_ALL
 211 gboolean             g_markup_parse_context_end_parse (GMarkupParseContext *context,
 212                                                        GError             **error);
 213 GLIB_AVAILABLE_IN_ALL
 214 const gchar *        g_markup_parse_context_get_element (GMarkupParseContext *context);
 215 GLIB_AVAILABLE_IN_ALL
 216 const GSList *       g_markup_parse_context_get_element_stack (GMarkupParseContext *context);
 217
 218 /* For user-constructed error messages, has no precise semantics */
 219 GLIB_AVAILABLE_IN_ALL
 220 void                 g_markup_parse_context_get_position (GMarkupParseContext *context,
 221                                                           gint                *line_number,
 222                                                           gint                *char_number);
 223 GLIB_AVAILABLE_IN_ALL
 224 gpointer             g_markup_parse_context_get_user_data (GMarkupParseContext *context);
 225
 226 /* useful when saving */
 227 GLIB_AVAILABLE_IN_ALL
 228 gchar* g_markup_escape_text (const gchar *text,
 229                              gssize       length);
 230
 231 GLIB_AVAILABLE_IN_ALL
 232 gchar *g_markup_printf_escaped (const char *format,
 233                                 ...) G_GNUC_PRINTF (1, 2);
 234 GLIB_AVAILABLE_IN_ALL
 235 gchar *g_markup_vprintf_escaped (const char *format,
 236                                  va_list     args) G_GNUC_PRINTF(1, 0);
 237
 238 typedef enum
 239 {
 240   G_MARKUP_COLLECT_INVALID,
 241   G_MARKUP_COLLECT_STRING,
 242   G_MARKUP_COLLECT_STRDUP,
 243   G_MARKUP_COLLECT_BOOLEAN,
 244   G_MARKUP_COLLECT_TRISTATE,
 245
 246   G_MARKUP_COLLECT_OPTIONAL = (1 << 16)
 247 } GMarkupCollectType;
 248
 249
 250 /* useful from start_element */
 251 GLIB_AVAILABLE_IN_ALL
 252 gboolean   g_markup_collect_attributes (const gchar         *element_name,
 253                                         const gchar        **attribute_names,
 254                                         const gchar        **attribute_values,
 255                                         GError             **error,
 256                                         GMarkupCollectType   first_type,
 257                                         const gchar         *first_attr,
 258                                         ...);
 259
 260 G_END_DECLS
 261
 262 #endif /* __G_MARKUP_H__ */