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  * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  *   Boston, MA 02111-1307, USA.
  19  */
  20
  21 #ifndef __G_MARKUP_H__
  22 #define __G_MARKUP_H__
  23
  24 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  25 #error "Only <glib.h> can be included directly."
  26 #endif
  27
  28 #include <stdarg.h>
  29
  30 #include <glib/gerror.h>
  31 #include <glib/gslist.h>
  32
  33 G_BEGIN_DECLS
  34
  35 /**
  36  * GMarkupError:
  37  * @G_MARKUP_ERROR_BAD_UTF8: text being parsed was not valid UTF-8
  38  * @G_MARKUP_ERROR_EMPTY: document contained nothing, or only whitespace
  39  * @G_MARKUP_ERROR_PARSE: document was ill-formed
  40  * @G_MARKUP_ERROR_UNKNOWN_ELEMENT: error should be set by #GMarkupParser
  41  *     functions; element wasn't known
  42  * @G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE: error should be set by #GMarkupParser
  43  *     functions; attribute wasn't known
  44  * @G_MARKUP_ERROR_INVALID_CONTENT: error should be set by #GMarkupParser
  45  *     functions; content was invalid
  46  * @G_MARKUP_ERROR_MISSING_ATTRIBUTE: error should be set by #GMarkupParser
  47  *     functions; a required attribute was missing
  48  *
  49  * Error codes returned by markup parsing.
  50  */
  51 typedef enum
  52 {
  53   G_MARKUP_ERROR_BAD_UTF8,
  54   G_MARKUP_ERROR_EMPTY,
  55   G_MARKUP_ERROR_PARSE,
  56   /* The following are primarily intended for specific GMarkupParser
  57    * implementations to set.
  58    */
  59   G_MARKUP_ERROR_UNKNOWN_ELEMENT,
  60   G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE,
  61   G_MARKUP_ERROR_INVALID_CONTENT,
  62   G_MARKUP_ERROR_MISSING_ATTRIBUTE
  63 } GMarkupError;
  64
  65 /**
  66  * G_MARKUP_ERROR:
  67  *
  68  * Error domain for markup parsing.
  69  * Errors in this domain will be from the #GMarkupError enumeration.
  70  * See #GError for information on error domains.
  71  */
  72 #define G_MARKUP_ERROR g_markup_error_quark ()
  73
  74 GLIB_AVAILABLE_IN_ALL
  75 GQuark g_markup_error_quark (void);
  76
  77 /**
  78  * GMarkupParseFlags:
  79  * @G_MARKUP_DO_NOT_USE_THIS_UNSUPPORTED_FLAG: flag you should not use
  80  * @G_MARKUP_TREAT_CDATA_AS_TEXT: When this flag is set, CDATA marked
  81  *     sections are not passed literally to the @passthrough function of
  82  *     the parser. Instead, the content of the section (without the
  83  *     <literal>&lt;![CDATA[</literal> and <literal>]]&gt;</literal>) is
  84  *     passed to the @text function. This flag was added in GLib 2.12
  85  * @G_MARKUP_PREFIX_ERROR_POSITION: Normally errors caught by GMarkup
  86  *     itself have line/column information prefixed to them to let the
  87  *     caller know the location of the error. When this flag is set the
  88  *     location information is also prefixed to errors generated by the
  89  *     #GMarkupParser implementation functions
  90  *
  91  * Flags that affect the behaviour of the parser.
  92  */
  93 typedef enum
  94 {
  95   G_MARKUP_DO_NOT_USE_THIS_UNSUPPORTED_FLAG = 1 << 0,
  96   G_MARKUP_TREAT_CDATA_AS_TEXT              = 1 << 1,
  97   G_MARKUP_PREFIX_ERROR_POSITION            = 1 << 2
  98 } GMarkupParseFlags;
  99
 100 /**
 101  * GMarkupParseContext:
 102  *
 103  * A parse context is used to parse a stream of bytes that
 104  * you expect to contain marked-up text.
 105  *
 106  * See g_markup_parse_context_new(), #GMarkupParser, and so
 107  * on for more details.
 108  */
 109 typedef struct _GMarkupParseContext GMarkupParseContext;
 110 typedef struct _GMarkupParser GMarkupParser;
 111
 112 /**
 113  * GMarkupParser:
 114  * @start_element: Callback to invoke when the opening tag of an element
 115  *     is seen.
 116  * @end_element: Callback to invoke when the closing tag of an element
 117  *     is seen. Note that this is also called for empty tags like
 118  *     <literal>&lt;empty/&gt;</literal>.
 119  * @text: Callback to invoke when some text is seen (text is always
 120  *     inside an element). Note that the text of an element may be spread
 121  *     over multiple calls of this function. If the
 122  *     %G_MARKUP_TREAT_CDATA_AS_TEXT flag is set, this function is also
 123  *     called for the content of CDATA marked sections.
 124  * @passthrough: Callback to invoke for comments, processing instructions
 125  *     and doctype declarations; if you're re-writing the parsed document,
 126  *     write the passthrough text back out in the same position. If the
 127  *     %G_MARKUP_TREAT_CDATA_AS_TEXT flag is not set, this function is also
 128  *     called for CDATA marked sections.
 129  * @error: Callback to invoke when an error occurs.
 130  *
 131  * Any of the fields in #GMarkupParser can be %NULL, in which case they
 132  * will be ignored. Except for the @error function, any of these callbacks
 133  * can set an error; in particular the %G_MARKUP_ERROR_UNKNOWN_ELEMENT,
 134  * %G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE, and %G_MARKUP_ERROR_INVALID_CONTENT
 135  * errors are intended to be set from these callbacks. If you set an error
 136  * from a callback, g_markup_parse_context_parse() will report that error
 137  * back to its caller.
 138  */
 139 struct _GMarkupParser
 140 {
 141   /* Called for open tags <foo bar="baz"> */
 142   void (*start_element)  (GMarkupParseContext *context,
 143                           const gchar         *element_name,
 144                           const gchar        **attribute_names,
 145                           const gchar        **attribute_values,
 146                           gpointer             user_data,
 147                           GError             **error);
 148
 149   /* Called for close tags </foo> */
 150   void (*end_element)    (GMarkupParseContext *context,
 151                           const gchar         *element_name,
 152                           gpointer             user_data,
 153                           GError             **error);
 154
 155   /* Called for character data */
 156   /* text is not nul-terminated */
 157   void (*text)           (GMarkupParseContext *context,
 158                           const gchar         *text,
 159                           gsize                text_len,
 160                           gpointer             user_data,
 161                           GError             **error);
 162
 163   /* Called for strings that should be re-saved verbatim in this same
 164    * position, but are not otherwise interpretable.  At the moment
 165    * this includes comments and processing instructions.
 166    */
 167   /* text is not nul-terminated. */
 168   void (*passthrough)    (GMarkupParseContext *context,
 169                           const gchar         *passthrough_text,
 170                           gsize                text_len,
 171                           gpointer             user_data,
 172                           GError             **error);
 173
 174   /* Called on error, including one set by other
 175    * methods in the vtable. The GError should not be freed.
 176    */
 177   void (*error)          (GMarkupParseContext *context,
 178                           GError              *error,
 179                           gpointer             user_data);
 180 };
 181
 182 GLIB_AVAILABLE_IN_ALL
 183 GMarkupParseContext *g_markup_parse_context_new   (const GMarkupParser *parser,
 184                                                    GMarkupParseFlags    flags,
 185                                                    gpointer             user_data,
 186                                                    GDestroyNotify       user_data_dnotify);
 187 GLIB_AVAILABLE_IN_2_36
 188 GMarkupParseContext *g_markup_parse_context_ref   (GMarkupParseContext *context);
 189 GLIB_AVAILABLE_IN_2_36
 190 void                 g_markup_parse_context_unref (GMarkupParseContext *context);
 191 GLIB_AVAILABLE_IN_ALL
 192 void                 g_markup_parse_context_free  (GMarkupParseContext *context);
 193 GLIB_AVAILABLE_IN_ALL
 194 gboolean             g_markup_parse_context_parse (GMarkupParseContext *context,
 195                                                    const gchar         *text,
 196                                                    gssize               text_len,
 197                                                    GError             **error);
 198 GLIB_AVAILABLE_IN_ALL
 199 void                 g_markup_parse_context_push  (GMarkupParseContext *context,
 200                                                    const GMarkupParser *parser,
 201                                                    gpointer             user_data);
 202 GLIB_AVAILABLE_IN_ALL
 203 gpointer             g_markup_parse_context_pop   (GMarkupParseContext *context);
 204
 205 GLIB_AVAILABLE_IN_ALL
 206 gboolean             g_markup_parse_context_end_parse (GMarkupParseContext *context,
 207                                                        GError             **error);
 208 GLIB_AVAILABLE_IN_ALL
 209 const gchar *        g_markup_parse_context_get_element (GMarkupParseContext *context);
 210 GLIB_AVAILABLE_IN_ALL
 211 const GSList *       g_markup_parse_context_get_element_stack (GMarkupParseContext *context);
 212
 213 /* For user-constructed error messages, has no precise semantics */
 214 GLIB_AVAILABLE_IN_ALL
 215 void                 g_markup_parse_context_get_position (GMarkupParseContext *context,
 216                                                           gint                *line_number,
 217                                                           gint                *char_number);
 218 GLIB_AVAILABLE_IN_ALL
 219 gpointer             g_markup_parse_context_get_user_data (GMarkupParseContext *context);
 220
 221 /* useful when saving */
 222 GLIB_AVAILABLE_IN_ALL
 223 gchar* g_markup_escape_text (const gchar *text,
 224                              gssize       length);
 225
 226 GLIB_AVAILABLE_IN_ALL
 227 gchar *g_markup_printf_escaped (const char *format,
 228                                 ...) G_GNUC_PRINTF (1, 2);
 229 GLIB_AVAILABLE_IN_ALL
 230 gchar *g_markup_vprintf_escaped (const char *format,
 231                                  va_list     args) G_GNUC_PRINTF(1, 0);
 232
 233 typedef enum
 234 {
 235   G_MARKUP_COLLECT_INVALID,
 236   G_MARKUP_COLLECT_STRING,
 237   G_MARKUP_COLLECT_STRDUP,
 238   G_MARKUP_COLLECT_BOOLEAN,
 239   G_MARKUP_COLLECT_TRISTATE,
 240
 241   G_MARKUP_COLLECT_OPTIONAL = (1 << 16)
 242 } GMarkupCollectType;
 243
 244
 245 /* useful from start_element */
 246 GLIB_AVAILABLE_IN_ALL
 247 gboolean   g_markup_collect_attributes (const gchar         *element_name,
 248                                         const gchar        **attribute_names,
 249                                         const gchar        **attribute_values,
 250                                         GError             **error,
 251                                         GMarkupCollectType   first_type,
 252                                         const gchar         *first_attr,
 253                                         ...);
 254
 255 G_END_DECLS
 256
 257 #endif /* __G_MARKUP_H__ */