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gtk2/gtk/gtktextbufferserialize.c
Michael Natterer 6c1d990adc Add infrastructure for copy/paste and DND of rich text for GtkTextBuffer. 
2006-03-07  Michael Natterer  <mitch@imendio.com>

	Add infrastructure for copy/paste and DND of rich text for
	GtkTextBuffer. Fixes bug #324177.

	* gtk/gtktextbufferrichtext.[ch]: new files implementing a
	per-buffer registry of rich text formats.

	* gtk/gtk.h: #include gtktextbufferrichtext.h

	* gtk/gtktextbufferserialize.[ch]: new files implementing an
	internal serialization format that can handle all of a text
	buffer's tags and pixbufs. It's not useful for anything except
	tranfer between instances of GtkTextBuffer (Anders Carlsson).

	* gtk/Makefile.am: build the new files.

	* gtk/gtkclipboard.[ch]: added convenience APIs for rich text,
	just as they exist for plain text and pixbufs.

	* gtk/gtkselection.[ch]: added rich text convenience APIs here
	too.  Return the target list from gtk_target_list_ref(). Register
	GtkTargetList as boxed type. Added
	gtk_target_table_new_from_list() and gtk_target_table_free(),
	which make converting between GtkTargetList and arrays of
	GtkTargetEntry considerably easier.

	* gtk/gtktextutil.[ch]: added _gtk_text_util_create_rich_drag_icon()
	which creates a fancy rich text icon (Matthias Clasen).

	* gtk/gtktextbuffer.[ch]: use all the new stuff above and
	implement copy and paste of rich text. Added APIs for getting the
	target lists used for copy and paste. Added public enum
	GtkTextBufferTargetInfo which contains the "info" IDs associated
	with the entries of the target lists.

	* gtk/gtktextview.c: use the new rich text APIs and
	GtkTextBuffer's new target list API to enable DND of rich text
	chunks.

	* gtk/gtk.symbols: export all the new symbols added.

	* tests/testtext.c: added rich text testing stuff.
2006-03-07 13:46:11 +00:00

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/* gtktextbufferserialize.c
*
* Copyright (C) 2001 Havoc Pennington
* Copyright (C) 2004 Nokia Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* FIXME: We should use other error codes for the
* parts that deal with the format errors
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "gdk-pixbuf/gdk-pixdata.h"
#include "gtktextbufferserialize.h"
#include "gtkintl.h"
typedef struct
{
GString *tag_table_str;
GString *text_str;
GHashTable *tags;
GtkTextIter start, end;
gint n_pixbufs;
GList *pixbufs;
gint tag_id;
GHashTable *tag_id_tags;
} SerializationContext;
static gchar *
serialize_value (GValue *value)
{
if (g_value_type_transformable (value->g_type, G_TYPE_STRING))
{
GValue text_value = { 0 };
gchar *tmp;
g_value_init (&text_value, G_TYPE_STRING);
g_value_transform (value, &text_value);
tmp = g_markup_escape_text (g_value_get_string (&text_value), -1);
g_value_unset (&text_value);
return tmp;
}
else if (value->g_type == GDK_TYPE_COLOR)
{
GdkColor *color = g_value_get_boxed (value);
return g_strdup_printf ("%x:%x:%x", color->red, color->green, color->blue);
}
else if (g_type_is_a (value->g_type, GDK_TYPE_DRAWABLE))
{
/* Don't do anything */
}
else
{
g_warning ("Type %s is not serializable\n", g_type_name (value->g_type));
}
return NULL;
}
static gboolean
deserialize_value (const gchar *str,
GValue *value)
{
if (g_value_type_transformable (G_TYPE_STRING, value->g_type))
{
GValue text_value = { 0 };
gboolean retval;
g_value_init (&text_value, G_TYPE_STRING);
g_value_set_static_string (&text_value, str);
retval = g_value_transform (&text_value, value);
g_value_unset (&text_value);
return retval;
}
else if (value->g_type == G_TYPE_BOOLEAN)
{
gboolean v;
v = strcmp (str, "TRUE") == 0;
g_value_set_boolean (value, v);
return TRUE;
}
else if (value->g_type == G_TYPE_INT)
{
gchar *tmp;
int v;
v = strtol (str, &tmp, 10);
if (tmp == NULL || tmp == str)
return FALSE;
g_value_set_int (value, v);
return TRUE;
}
else if (value->g_type == G_TYPE_DOUBLE)
{
gchar *tmp;
gdouble v;
v = g_ascii_strtod (str, &tmp);
if (tmp == NULL || tmp == str)
return FALSE;
g_value_set_double (value, v);
return TRUE;
}
else if (value->g_type == GDK_TYPE_COLOR)
{
GdkColor color;
const gchar *old;
gchar *tmp;
old = str;
color.red = strtol (old, &tmp, 16);
if (tmp == NULL || tmp == old)
return FALSE;
old = tmp;
if (*old++ != ':')
return FALSE;
color.green = strtol (old, &tmp, 16);
if (tmp == NULL || tmp == old)
return FALSE;
old = tmp;
if (*old++ != ':')
return FALSE;
color.blue = strtol (old, &tmp, 16);
if (tmp == NULL || tmp == old || *tmp != '\0')
return FALSE;
g_value_set_boxed (value, &color);
return TRUE;
}
else if (G_VALUE_HOLDS_ENUM (value))
{
GEnumClass *class = G_ENUM_CLASS (g_type_class_peek (value->g_type));
GEnumValue *enum_value;
enum_value = g_enum_get_value_by_name (class, str);
if (enum_value)
{
g_value_set_enum (value, enum_value->value);
return TRUE;
}
return FALSE;
}
else
{
g_warning ("Type %s can not be deserialized\n", g_type_name (value->g_type));
}
return FALSE;
}
/* Checks if a param is set, or if it's the default value */
static gboolean
is_param_set (GObject *object,
GParamSpec *pspec,
GValue *value)
{
/* We need to special case some attributes here */
if (strcmp (pspec->name, "background-gdk") == 0)
{
gboolean is_set;
g_object_get (object, "background-set", &is_set, NULL);
if (is_set)
{
g_value_init (value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (object, pspec->name, value);
return TRUE;
}
return FALSE;
}
else if (strcmp (pspec->name, "foreground-gdk") == 0)
{
gboolean is_set;
g_object_get (object, "foreground-set", &is_set, NULL);
if (is_set)
{
g_value_init (value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (object, pspec->name, value);
return TRUE;
}
return FALSE;
}
else
{
gboolean is_set;
gchar *is_set_name;
is_set_name = g_strdup_printf ("%s-set", pspec->name);
if (g_object_class_find_property (G_OBJECT_GET_CLASS (object), is_set_name) == NULL)
{
g_free (is_set_name);
return FALSE;
}
else
{
g_object_get (object, is_set_name, &is_set, NULL);
if (!is_set)
{
g_free (is_set_name);
return FALSE;
}
g_free (is_set_name);
g_value_init (value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (object, pspec->name, value);
if (g_param_value_defaults (pspec, value))
{
g_value_unset (value);
return FALSE;
}
}
return TRUE;
}
}
static void
serialize_tag (gpointer key,
gpointer data,
gpointer user_data)
{
SerializationContext *context = user_data;
GtkTextTag *tag = data;
gchar *tag_name;
gint tag_id;
GParamSpec **pspecs;
guint n_pspecs;
int i;
g_string_append (context->tag_table_str, " <tag ");
/* Handle anonymous tags */
if (tag->name)
{
tag_name = g_markup_escape_text (tag->name, -1);
g_string_append_printf (context->tag_table_str, "name=\"%s\"", tag_name);
g_free (tag_name);
}
else
{
tag_id = GPOINTER_TO_INT (g_hash_table_lookup (context->tag_id_tags, tag));
g_string_append_printf (context->tag_table_str, "id=\"%d\"", tag_id);
}
g_string_append_printf (context->tag_table_str, " priority=\"%d\">\n", tag->priority);
/* Serialize properties */
pspecs = g_object_class_list_properties (G_OBJECT_GET_CLASS (tag), &n_pspecs);
for (i = 0; i < n_pspecs; i++)
{
GValue value = { 0 };
gchar *tmp, *tmp2;
if (!(pspecs[i]->flags & G_PARAM_READABLE) ||
!(pspecs[i]->flags & G_PARAM_WRITABLE))
continue;
if (!is_param_set (G_OBJECT (tag), pspecs[i], &value))
continue;
/* Now serialize the attr */
tmp2 = serialize_value (&value);
if (tmp2)
{
tmp = g_markup_escape_text (pspecs[i]->name, -1);
g_string_append_printf (context->tag_table_str, " <attr name=\"%s\" ", tmp);
g_free (tmp);
tmp = g_markup_escape_text (g_type_name (pspecs[i]->value_type), -1);
g_string_append_printf (context->tag_table_str, "type=\"%s\" value=\"%s\" />\n", tmp, tmp2);
g_free (tmp);
g_free (tmp2);
}
g_value_unset (&value);
}
g_free (pspecs);
g_string_append (context->tag_table_str, " </tag>\n");
}
static void
serialize_tags (SerializationContext *context)
{
g_string_append (context->tag_table_str, " <text_view_markup>\n");
g_string_append (context->tag_table_str, " <tags>\n");
g_hash_table_foreach (context->tags, serialize_tag, context);
g_string_append (context->tag_table_str, " </tags>\n");
}
#if 0
static void
dump_tag_list (const gchar *str,
GList *list)
{
g_print ("%s: ", str);
if (!list)
g_print ("(empty)");
else
{
while (list)
{
g_print ("%s ", ((GtkTextTag *)list->data)->name);
list = list->next;
}
}
g_print ("\n");
}
#endif
static void
find_list_delta (GSList *old_list,
GSList *new_list,
GList **added,
GList **removed)
{
GSList *tmp;
GList *tmp_added, *tmp_removed;
tmp_added = NULL;
tmp_removed = NULL;
/* Find added tags */
tmp = new_list;
while (tmp)
{
if (!g_slist_find (old_list, tmp->data))
tmp_added = g_list_prepend (tmp_added, tmp->data);
tmp = tmp->next;
}
*added = tmp_added;
/* Find removed tags */
tmp = old_list;
while (tmp)
{
if (!g_slist_find (new_list, tmp->data))
tmp_removed = g_list_prepend (tmp_removed, tmp->data);
tmp = tmp->next;
}
/* We reverse the list here to match the xml semantics */
*removed = g_list_reverse (tmp_removed);
}
static void
serialize_section_header (GString *str,
const gchar *name,
gint length)
{
g_return_if_fail (strlen (name) == 26);
g_string_append (str, name);
g_string_append_c (str, length >> 24);
g_string_append_c (str, (length >> 16) & 0xff);
g_string_append_c (str, (length >> 8) & 0xff);
g_string_append_c (str, length & 0xff);
}
static void
serialize_text (GtkTextBuffer *buffer,
SerializationContext *context)
{
GtkTextIter iter, old_iter;
GSList *tag_list, *new_tag_list;
GQueue *active_tags;
int i;
g_string_append (context->text_str, "<text>");
iter = context->start;
tag_list = NULL;
active_tags = g_queue_new ();
do
{
GList *added, *removed;
GList *tmp;
gchar *tmp_text, *escaped_text;
new_tag_list = gtk_text_iter_get_tags (&iter);
find_list_delta (tag_list, new_tag_list, &added, &removed);
/* Handle removed tags */
tmp = removed;
while (tmp)
{
GtkTextTag *tag = tmp->data;
g_string_append (context->text_str, "</apply_tag>");
/* We might need to drop some of the tags and re-add them afterwards */
while (g_queue_peek_head (active_tags) != tag &&
!g_queue_is_empty (active_tags))
{
added = g_list_prepend (added, g_queue_pop_head (active_tags));
g_string_append_printf (context->text_str, "</apply_tag>");
}
g_queue_pop_head (active_tags);
tmp = tmp->next;
}
/* Handle added tags */
tmp = added;
while (tmp)
{
GtkTextTag *tag = tmp->data;
gchar *tag_name;
/* Add it to the tag hash table */
g_hash_table_insert (context->tags, tag, tag);
if (tag->name)
{
tag_name = g_markup_escape_text (tag->name, -1);
g_string_append_printf (context->text_str, "<apply_tag name=\"%s\">", tag_name);
g_free (tag_name);
}
else
{
gpointer tag_id;
/* We've got an anonymous tag, find out if it's been
used before */
if (!g_hash_table_lookup_extended (context->tag_id_tags, tag, NULL, &tag_id))
{
tag_id = GINT_TO_POINTER (context->tag_id++);
g_hash_table_insert (context->tag_id_tags, tag, tag_id);
}
g_string_append_printf (context->text_str, "<apply_tag id=\"%d\">", GPOINTER_TO_INT (tag_id));
}
g_queue_push_head (active_tags, tag);
tmp = tmp->next;
}
g_slist_free (tag_list);
tag_list = new_tag_list;
old_iter = iter;
/* Now try to go to either the next tag toggle, or if a pixbuf appears */
while (TRUE)
{
gunichar ch = gtk_text_iter_get_char (&iter);
if (ch == 0xFFFC)
{
GdkPixbuf *pixbuf = gtk_text_iter_get_pixbuf (&iter);
if (pixbuf)
{
/* Append the text before the pixbuf */
tmp_text = gtk_text_iter_get_slice (&old_iter, &iter);
escaped_text = g_markup_escape_text (tmp_text, -1);
g_free (tmp_text);
/* Forward so we don't get the 0xfffc char */
gtk_text_iter_forward_char (&iter);
old_iter = iter;
g_string_append (context->text_str, escaped_text);
g_free (escaped_text);
g_string_append_printf (context->text_str, "<pixbuf index=\"%d\" />", context->n_pixbufs);
context->n_pixbufs++;
context->pixbufs = g_list_prepend (context->pixbufs, pixbuf);
}
}
else if (ch == 0)
{
break;
}
else
gtk_text_iter_forward_char (&iter);
if (gtk_text_iter_toggles_tag (&iter, NULL))
break;
}
/* We might have moved too far */
if (gtk_text_iter_compare (&iter, &context->end) > 0)
iter = context->end;
/* Append the text */
tmp_text = gtk_text_iter_get_slice (&old_iter, &iter);
escaped_text = g_markup_escape_text (tmp_text, -1);
g_free (tmp_text);
g_string_append (context->text_str, escaped_text);
g_free (escaped_text);
}
while (!gtk_text_iter_equal (&iter, &context->end));
/* Close any open tags */
for (i = 0; i < g_queue_get_length (active_tags); i++) {
g_string_append (context->text_str, "</apply_tag>");
}
g_queue_free (active_tags);
g_string_append (context->text_str, "</text>\n</text_view_markup>\n");
}
static void
serialize_pixbufs (SerializationContext *context,
GString *text)
{
GList *list;
for (list = context->pixbufs; list != NULL; list = list->next)
{
GdkPixbuf *pixbuf = list->data;
GdkPixdata pixdata;
guint8 *tmp;
guint len;
gdk_pixdata_from_pixbuf (&pixdata, pixbuf, FALSE);
tmp = gdk_pixdata_serialize (&pixdata, &len);
serialize_section_header (text, "GTKTEXTBUFFERPIXBDATA-0001", len);
g_string_append_len (text, (gchar *) tmp, len);
g_free (tmp);
}
}
guint8 *
_gtk_text_buffer_serialize_rich_text (GtkTextBuffer *register_buffer,
GtkTextBuffer *content_buffer,
const GtkTextIter *start,
const GtkTextIter *end,
gsize *length,
gpointer user_data)
{
SerializationContext context;
GString *text;
context.tags = g_hash_table_new (NULL, NULL);
context.text_str = g_string_new (NULL);
context.tag_table_str = g_string_new (NULL);
context.start = *start;
context.end = *end;
context.n_pixbufs = 0;
context.pixbufs = NULL;
context.tag_id = 0;
context.tag_id_tags = g_hash_table_new (NULL, NULL);
/* We need to serialize the text before the tag table so we know
what tags are used */
serialize_text (content_buffer, &context);
serialize_tags (&context);
text = g_string_new (NULL);
serialize_section_header (text, "GTKTEXTBUFFERCONTENTS-0001",
context.tag_table_str->len + context.text_str->len);
g_string_append_len (text, context.tag_table_str->str, context.tag_table_str->len);
g_string_append_len (text, context.text_str->str, context.text_str->len);
context.pixbufs = g_list_reverse (context.pixbufs);
serialize_pixbufs (&context, text);
g_hash_table_destroy (context.tags);
g_list_free (context.pixbufs);
g_string_free (context.text_str, TRUE);
g_string_free (context.tag_table_str, TRUE);
g_hash_table_destroy (context.tag_id_tags);
*length = text->len;
return (guint8 *) g_string_free (text, FALSE);
}
typedef enum
{
STATE_START,
STATE_TEXT_VIEW_MARKUP,
STATE_TAGS,
STATE_TAG,
STATE_ATTR,
STATE_TEXT,
STATE_APPLY_TAG,
STATE_PIXBUF
} ParseState;
typedef struct
{
gchar *text;
GdkPixbuf *pixbuf;
GSList *tags;
} TextSpan;
typedef struct
{
GtkTextTag *tag;
gint prio;
} TextTagPrio;
typedef struct
{
GSList *states;
GList *headers;
GtkTextBuffer *buffer;
/* Tags that are defined in <tag> elements */
GHashTable *defined_tags;
/* Tags that are anonymous */
GHashTable *anonymous_tags;
/* Tag name substitutions */
GHashTable *substitutions;
/* Current tag */
GtkTextTag *current_tag;
/* Priority of current tag */
gint current_tag_prio;
/* Id of current tag */
gint current_tag_id;
/* Tags and their priorities */
GList *tag_priorities;
GSList *tag_stack;
GList *spans;
gboolean create_tags;
gboolean parsed_text;
gboolean parsed_tags;
} ParseInfo;
static void
set_error (GError **err,
GMarkupParseContext *context,
int error_domain,
int error_code,
const char *format,
...)
{
int line, ch;
va_list args;
char *str;
g_markup_parse_context_get_position (context, &line, &ch);
va_start (args, format);
str = g_strdup_vprintf (format, args);
va_end (args);
g_set_error (err, error_domain, error_code,
("Line %d character %d: %s"),
line, ch, str);
g_free (str);
}
static void
push_state (ParseInfo *info,
ParseState state)
{
info->states = g_slist_prepend (info->states, GINT_TO_POINTER (state));
}
static void
pop_state (ParseInfo *info)
{
g_return_if_fail (info->states != NULL);
info->states = g_slist_remove (info->states, info->states->data);
}
static ParseState
peek_state (ParseInfo *info)
{
g_return_val_if_fail (info->states != NULL, STATE_START);
return GPOINTER_TO_INT (info->states->data);
}
#define ELEMENT_IS(name) (strcmp (element_name, (name)) == 0)
static gboolean
check_id_or_name (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gint *id,
const gchar **name,
GError **error)
{
gboolean has_id = FALSE;
gboolean has_name = FALSE;
int i;
*id = 0;
*name = NULL;
for (i = 0; attribute_names[i] != NULL; i++)
{
if (strcmp (attribute_names[i], "name") == 0)
{
*name = attribute_values[i];
if (has_id)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Both \"id\" and \"name\" were found on the <%s> element"),
element_name);
return FALSE;
}
if (has_name)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("The attribute \"name\" were found twice on the <%s> element"),
element_name);
return FALSE;
}
has_name = TRUE;
}
else if (strcmp (attribute_names[i], "id") == 0)
{
gchar *tmp;
if (has_name)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Both \"id\" and \"name\" were found on the <%s> element"),
element_name);
return FALSE;
}
if (has_id)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("The attribute \"id\" were found twice on the <%s> element"),
element_name);
return FALSE;
}
has_id = TRUE;
/* Try parsing the integer */
*id = strtol (attribute_values[i], &tmp, 10);
if (tmp == NULL || tmp == attribute_values[i])
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("<%s> element has invalid id \"%s\""), attribute_values[i]);
return FALSE;
}
}
}
if (!has_id && !has_name)
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("<%s> element neither a \"name\" nor an \"id\" element"), element_name);
return FALSE;
}
return TRUE;
}
typedef struct
{
const char *name;
const char **retloc;
} LocateAttr;
static gboolean
locate_attributes (GMarkupParseContext *context,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
gboolean allow_unknown_attrs,
GError **error,
const char *first_attribute_name,
const char **first_attribute_retloc,
...)
{
va_list args;
const char *name;
const char **retloc;
int n_attrs;
#define MAX_ATTRS 24
LocateAttr attrs[MAX_ATTRS];
gboolean retval;
int i;
g_return_val_if_fail (first_attribute_name != NULL, FALSE);
g_return_val_if_fail (first_attribute_retloc != NULL, FALSE);
retval = TRUE;
n_attrs = 1;
attrs[0].name = first_attribute_name;
attrs[0].retloc = first_attribute_retloc;
*first_attribute_retloc = NULL;
va_start (args, first_attribute_retloc);
name = va_arg (args, const char*);
retloc = va_arg (args, const char**);
while (name != NULL)
{
g_return_val_if_fail (retloc != NULL, FALSE);
g_assert (n_attrs < MAX_ATTRS);
attrs[n_attrs].name = name;
attrs[n_attrs].retloc = retloc;
n_attrs += 1;
*retloc = NULL;
name = va_arg (args, const char*);
retloc = va_arg (args, const char**);
}
va_end (args);
if (!retval)
return retval;
i = 0;
while (attribute_names[i])
{
int j;
gboolean found;
found = FALSE;
j = 0;
while (j < n_attrs)
{
if (strcmp (attrs[j].name, attribute_names[i]) == 0)
{
retloc = attrs[j].retloc;
if (*retloc != NULL)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Attribute \"%s\" repeated twice on the same <%s> element"),
attrs[j].name, element_name);
retval = FALSE;
goto out;
}
*retloc = attribute_values[i];
found = TRUE;
}
++j;
}
if (!found && !allow_unknown_attrs)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Attribute \"%s\" is invalid on <%s> element in this context"),
attribute_names[i], element_name);
retval = FALSE;
goto out;
}
++i;
}
out:
return retval;
}
static gboolean
check_no_attributes (GMarkupParseContext *context,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
GError **error)
{
if (attribute_names[0] != NULL)
{
set_error (error, context,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Attribute \"%s\" is invalid on <%s> element in this context"),
attribute_names[0], element_name);
return FALSE;
}
return TRUE;
}
static GtkTextTag *
tag_exists (GMarkupParseContext *context,
const gchar *name,
gint id,
ParseInfo *info,
GError **error)
{
const gchar *real_name;
if (info->create_tags)
{
/* If we have an anonymous tag, just return it directly */
if (!name)
return g_hash_table_lookup (info->anonymous_tags,
GINT_TO_POINTER (id));
/* First, try the substitutions */
real_name = g_hash_table_lookup (info->substitutions, name);
if (real_name)
return gtk_text_tag_table_lookup (info->buffer->tag_table, real_name);
/* Next, try the list of defined tags */
if (g_hash_table_lookup (info->defined_tags, name) != NULL)
return gtk_text_tag_table_lookup (info->buffer->tag_table, name);
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Tag \"%s\" has not been defined."), name);
return NULL;
}
else
{
GtkTextTag *tag;
if (!name)
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Anonymous tag found and tags can not be created."));
return NULL;
}
tag = gtk_text_tag_table_lookup (info->buffer->tag_table, name);
if (tag)
return tag;
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Tag \"%s\" does not exist in buffer and tags can not be created."), name);
return NULL;
}
}
typedef struct
{
const gchar *id;
gint length;
const gchar *start;
} Header;
static GdkPixbuf *
get_pixbuf_from_headers (GList *headers,
int id,
GError **error)
{
Header *header;
GdkPixdata pixdata;
GdkPixbuf *pixbuf;
header = g_list_nth_data (headers, id);
if (!header)
return NULL;
if (!gdk_pixdata_deserialize (&pixdata, header->length,
(const guint8 *) header->start, error))
return NULL;
pixbuf = gdk_pixbuf_from_pixdata (&pixdata, TRUE, error);
return pixbuf;
}
static void
parse_apply_tag_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
ParseInfo *info,
GError **error)
{
const gchar *name, *priority;
gint id;
GtkTextTag *tag;
g_assert (peek_state (info) == STATE_TEXT ||
peek_state (info) == STATE_APPLY_TAG);
if (ELEMENT_IS ("apply_tag"))
{
if (!locate_attributes (context, element_name, attribute_names, attribute_values, TRUE, error,
"priority", &priority, NULL))
return;
if (!check_id_or_name (context, element_name, attribute_names, attribute_values,
&id, &name, error))
return;
tag = tag_exists (context, name, id, info, error);
if (!tag)
return;
info->tag_stack = g_slist_prepend (info->tag_stack, tag);
push_state (info, STATE_APPLY_TAG);
}
else if (ELEMENT_IS ("pixbuf"))
{
int int_id;
GdkPixbuf *pixbuf;
TextSpan *span;
const gchar *pixbuf_id;
if (!locate_attributes (context, element_name, attribute_names, attribute_values, FALSE, error,
"index", &pixbuf_id, NULL))
return;
int_id = atoi (pixbuf_id);
pixbuf = get_pixbuf_from_headers (info->headers, int_id, error);
span = g_new0 (TextSpan, 1);
span->pixbuf = pixbuf;
span->tags = NULL;
info->spans = g_list_prepend (info->spans, span);
if (!pixbuf)
return;
push_state (info, STATE_PIXBUF);
}
else
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Element <%s> is not allowed below <%s>"),
element_name, peek_state(info) == STATE_TEXT ? "text" : "apply_tag");
}
static void
parse_attr_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
ParseInfo *info,
GError **error)
{
const gchar *name, *type, *value;
GType gtype;
GValue gvalue = { 0 };
GParamSpec *pspec;
g_assert (peek_state (info) == STATE_TAG);
if (ELEMENT_IS ("attr"))
{
if (!locate_attributes (context, element_name, attribute_names, attribute_values, FALSE, error,
"name", &name, "type", &type, "value", &value, NULL))
return;
gtype = g_type_from_name (type);
if (gtype == G_TYPE_INVALID)
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("\"%s\" is not a valid attribute type"), type);
return;
}
if (!(pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (info->current_tag), name)))
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("\"%s\" is not a valid attribute name"), name);
return;
}
g_value_init (&gvalue, gtype);
if (!deserialize_value (value, &gvalue))
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("\"%s\" could not be converted to a value of type \"%s\" for attribute \"%s\""),
value, type, name);
return;
}
if (g_param_value_validate (pspec, &gvalue))
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("\"%s\" is not a valid value of for attribute \"%s\""),
value, name);
g_value_unset (&gvalue);
return;
}
g_object_set_property (G_OBJECT (info->current_tag),
name, &gvalue);
g_value_unset (&gvalue);
push_state (info, STATE_ATTR);
}
else
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Element <%s> is not allowed below <%s>"),
element_name, "tag");
}
}
static gchar *
get_tag_name (ParseInfo *info,
const gchar *tag_name)
{
gchar *name;
gint i;
name = g_strdup (tag_name);
if (!info->create_tags)
return name;
i = 0;
while (gtk_text_tag_table_lookup (info->buffer->tag_table, name) != NULL)
{
g_free (name);
name = g_strdup_printf ("%s-%d", tag_name, ++i);
}
if (i != 0)
{
g_hash_table_insert (info->substitutions, g_strdup (tag_name), g_strdup (name));
}
return name;
}
static void
parse_tag_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
ParseInfo *info,
GError **error)
{
const gchar *name, *priority;
gchar *tag_name;
gint id;
gint prio;
gchar *tmp;
g_assert (peek_state (info) == STATE_TAGS);
if (ELEMENT_IS ("tag"))
{
if (!locate_attributes (context, element_name, attribute_names, attribute_values, TRUE, error,
"priority", &priority, NULL))
return;
if (!check_id_or_name (context, element_name, attribute_names, attribute_values,
&id, &name, error))
return;
if (name)
{
if (g_hash_table_lookup (info->defined_tags, name) != NULL)
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Tag \"%s\" already defined"), name);
return;
}
}
prio = strtol (priority, &tmp, 10);
if (tmp == NULL || tmp == priority)
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Tag \"%s\" has invalid priority \"%s\""), name, priority);
return;
}
if (name)
{
tag_name = get_tag_name (info, name);
info->current_tag = gtk_text_tag_new (tag_name);
g_free (tag_name);
}
else
{
info->current_tag = gtk_text_tag_new (NULL);
info->current_tag_id = id;
}
info->current_tag_prio = prio;
push_state (info, STATE_TAG);
}
else
{
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Element <%s> is not allowed below <%s>"),
element_name, "tags");
}
}
static void
start_element_handler (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
ParseInfo *info = user_data;
switch (peek_state (info))
{
case STATE_START:
if (ELEMENT_IS ("text_view_markup"))
{
if (!check_no_attributes (context, element_name,
attribute_names, attribute_values, error))
return;
push_state (info, STATE_TEXT_VIEW_MARKUP);
break;
}
else
set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Outermost element in text must be <text_view_markup> not <%s>"),
element_name);
break;
case STATE_TEXT_VIEW_MARKUP:
if (ELEMENT_IS ("tags"))
{
if (info->parsed_tags)
{
set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("A <tags> element has already been specified"));
return;
}
if (!check_no_attributes (context, element_name,
attribute_names, attribute_values, error))
return;
push_state (info, STATE_TAGS);
break;
}
else if (ELEMENT_IS ("text"))
{
if (info->parsed_text)
{
set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("A <text> element has already been specified"));
return;
}
else if (!info->parsed_tags)
{
set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("A <text> element can't occur before a <tags> element"));
return;
}
if (!check_no_attributes (context, element_name,
attribute_names, attribute_values, error))
return;
push_state (info, STATE_TEXT);
break;
}
else
set_error (error, context,
G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE,
_("Element <%s> is not allowed below <%s>"),
element_name, "text_view_markup");
break;
case STATE_TAGS:
parse_tag_element (context, element_name,
attribute_names, attribute_values,
info, error);
break;
case STATE_TAG:
parse_attr_element (context, element_name,
attribute_names, attribute_values,
info, error);
break;
case STATE_TEXT:
case STATE_APPLY_TAG:
parse_apply_tag_element (context, element_name,
attribute_names, attribute_values,
info, error);
break;
default:
g_assert_not_reached ();
break;
}
}
static gint
sort_tag_prio (TextTagPrio *a,
TextTagPrio *b)
{
if (a->prio < b->prio)
return -1;
else if (a->prio > b->prio)
return 1;
else
return 0;
}
static void
end_element_handler (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
ParseInfo *info = user_data;
gchar *tmp;
GList *list;
switch (peek_state (info))
{
case STATE_TAGS:
pop_state (info);
g_assert (peek_state (info) == STATE_TEXT_VIEW_MARKUP);
info->parsed_tags = TRUE;
/* Sort list and add the tags */
info->tag_priorities = g_list_sort (info->tag_priorities,
(GCompareFunc)sort_tag_prio);
list = info->tag_priorities;
while (list)
{
TextTagPrio *prio = list->data;
if (info->create_tags)
gtk_text_tag_table_add (info->buffer->tag_table, prio->tag);
g_object_unref (prio->tag);
prio->tag = NULL;
list = list->next;
}
break;
case STATE_TAG:
pop_state (info);
g_assert (peek_state (info) == STATE_TAGS);
if (info->current_tag->name)
{
/* Add tag to defined tags hash */
tmp = g_strdup (info->current_tag->name);
g_hash_table_insert (info->defined_tags,
tmp, tmp);
}
else
{
g_hash_table_insert (info->anonymous_tags,
GINT_TO_POINTER (info->current_tag_id),
info->current_tag);
}
if (info->create_tags)
{
TextTagPrio *prio;
/* add the tag to the list */
prio = g_new0 (TextTagPrio, 1);
prio->prio = info->current_tag_prio;
prio->tag = info->current_tag;
info->tag_priorities = g_list_prepend (info->tag_priorities, prio);
}
info->current_tag = NULL;
break;
case STATE_ATTR:
pop_state (info);
g_assert (peek_state (info) == STATE_TAG);
break;
case STATE_APPLY_TAG:
pop_state (info);
g_assert (peek_state (info) == STATE_APPLY_TAG ||
peek_state (info) == STATE_TEXT);
/* Pop tag */
info->tag_stack = g_slist_delete_link (info->tag_stack,
info->tag_stack);
break;
case STATE_TEXT:
pop_state (info);
g_assert (peek_state (info) == STATE_TEXT_VIEW_MARKUP);
info->spans = g_list_reverse (info->spans);
info->parsed_text = TRUE;
break;
case STATE_TEXT_VIEW_MARKUP:
pop_state (info);
g_assert (peek_state (info) == STATE_START);
break;
case STATE_PIXBUF:
pop_state (info);
g_assert (peek_state (info) == STATE_APPLY_TAG ||
peek_state (info) == STATE_TEXT);
break;
default:
g_assert_not_reached ();
break;
}
}
static gboolean
all_whitespace (const char *text,
int text_len)
{
const char *p;
const char *end;
p = text;
end = text + text_len;
while (p != end)
{
if (!g_ascii_isspace (*p))
return FALSE;
p = g_utf8_next_char (p);
}
return TRUE;
}
static void
text_handler (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
ParseInfo *info = user_data;
TextSpan *span;
if (all_whitespace (text, text_len) &&
peek_state (info) != STATE_TEXT &&
peek_state (info) != STATE_APPLY_TAG)
return;
switch (peek_state (info))
{
case STATE_START:
g_assert_not_reached (); /* gmarkup shouldn't do this */
break;
case STATE_TEXT:
case STATE_APPLY_TAG:
if (text_len == 0)
return;
span = g_new0 (TextSpan, 1);
span->text = g_strndup (text, text_len);
span->tags = g_slist_copy (info->tag_stack);
info->spans = g_list_prepend (info->spans, span);
break;
default:
g_assert_not_reached ();
break;
}
}
static void
parse_info_init (ParseInfo *info,
GtkTextBuffer *buffer,
gboolean create_tags,
GList *headers)
{
info->states = g_slist_prepend (NULL, GINT_TO_POINTER (STATE_START));
info->create_tags = create_tags;
info->headers = headers;
info->defined_tags = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
info->substitutions = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
info->anonymous_tags = g_hash_table_new_full (NULL, NULL, NULL, NULL);
info->tag_stack = NULL;
info->spans = NULL;
info->parsed_text = FALSE;
info->parsed_tags = FALSE;
info->current_tag = NULL;
info->current_tag_prio = -1;
info->tag_priorities = NULL;
info->buffer = buffer;
}
static void
text_span_free (TextSpan *span)
{
g_free (span->text);
g_slist_free (span->tags);
g_free (span);
}
static void
parse_info_free (ParseInfo *info)
{
GSList *slist;
GList *list;
slist = info->tag_stack;
while (slist)
{
g_free (slist->data);
slist = slist->next;
}
g_slist_free (info->tag_stack);
g_slist_free (info->states);
g_hash_table_destroy (info->substitutions);
g_hash_table_destroy (info->defined_tags);
if (info->current_tag)
g_object_unref (info->current_tag);
list = info->spans;
while (list)
{
text_span_free (list->data);
list = list->next;
}
g_list_free (info->spans);
list = info->tag_priorities;
while (list)
{
TextTagPrio *prio = list->data;
if (prio->tag)
g_object_unref (prio->tag);
g_free (prio);
list = list->next;
}
g_list_free (info->tag_priorities);
}
static void
insert_text (ParseInfo *info,
GtkTextIter *iter)
{
GtkTextIter start_iter;
GtkTextMark *mark;
GList *tmp;
GSList *tags;
start_iter = *iter;
mark = gtk_text_buffer_create_mark (info->buffer, "deserialize_insert_point",
&start_iter, TRUE);
tmp = info->spans;
while (tmp)
{
TextSpan *span = tmp->data;
if (span->text)
gtk_text_buffer_insert (info->buffer, iter, span->text, -1);
else
{
gtk_text_buffer_insert_pixbuf (info->buffer, iter, span->pixbuf);
g_object_unref (span->pixbuf);
}
gtk_text_buffer_get_iter_at_mark (info->buffer, &start_iter, mark);
/* Apply tags */
tags = span->tags;
while (tags)
{
GtkTextTag *tag = tags->data;
gtk_text_buffer_apply_tag (info->buffer, tag,
&start_iter, iter);
tags = tags->next;
}
gtk_text_buffer_move_mark (info->buffer, mark, iter);
tmp = tmp->next;
}
gtk_text_buffer_delete_mark (info->buffer, mark);
}
static int
read_int (const guchar *start)
{
int result;
result =
start[0] << 24 |
start[1] << 16 |
start[2] << 8 |
start[3];
return result;
}
static gboolean
header_is (Header *header,
const gchar *id)
{
return (strncmp (header->id, id, strlen (id)) == 0);
}
static GList *
read_headers (const gchar *start,
gint len,
GError **error)
{
int i = 0;
int section_len;
Header *header;
GList *headers = NULL;
while (i < len)
{
if (i + 30 >= len)
goto error;
if (strncmp (start + i, "GTKTEXTBUFFERCONTENTS-0001", 26) == 0 ||
strncmp (start + i, "GTKTEXTBUFFERPIXBDATA-0001", 26) == 0)
{
section_len = read_int ((const guchar *) start + i + 26);
if (i + 30 + section_len > len)
goto error;
header = g_new0 (Header, 1);
header->id = start + i;
header->length = section_len;
header->start = start + i + 30;
i += 30 + section_len;
headers = g_list_prepend (headers, header);
}
else
break;
}
return g_list_reverse (headers);
error:
g_list_foreach (headers, (GFunc) g_free, NULL);
g_list_free (headers);
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Serialized data is malformed"));
return NULL;
}
static gboolean
deserialize_text (GtkTextBuffer *buffer,
GtkTextIter *iter,
const gchar *text,
gint len,
gboolean create_tags,
GError **error,
GList *headers)
{
GMarkupParseContext *context;
ParseInfo info;
gboolean retval = FALSE;
static GMarkupParser rich_text_parser = {
start_element_handler,
end_element_handler,
text_handler,
NULL,
NULL
};
parse_info_init (&info, buffer, create_tags, headers);
context = g_markup_parse_context_new (&rich_text_parser,
0, &info, NULL);
if (!g_markup_parse_context_parse (context,
text,
len,
error))
goto out;
if (!g_markup_parse_context_end_parse (context, error))
goto out;
retval = TRUE;
/* Now insert the text */
insert_text (&info, iter);
out:
parse_info_free (&info);
g_markup_parse_context_free (context);
return retval;
}
gboolean
_gtk_text_buffer_deserialize_rich_text (GtkTextBuffer *register_buffer,
GtkTextBuffer *content_buffer,
GtkTextIter *iter,
const guint8 *text,
gsize length,
gboolean create_tags,
gpointer user_data,
GError **error)
{
GList *headers;
Header *header;
gboolean retval;
headers = read_headers ((gchar *) text, length, error);
if (!headers)
return FALSE;
header = headers->data;
if (!header_is (header, "GTKTEXTBUFFERCONTENTS-0001"))
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_PARSE,
_("Serialized data is malformed. First section isn't GTKTEXTBUFFERCONTENTS-0001"));
retval = FALSE;
goto out;
}
retval = deserialize_text (content_buffer, iter,
header->start, header->length,
create_tags, error, headers->next);
out:
g_list_foreach (headers, (GFunc)g_free, NULL);
g_list_free (headers);
return retval;
}
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