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gtk2/gtk/gtkpango.c
Matthias Clasen 3371e3aa49 Move label attribute parser code 
We want to reuse the parser for <attributes> in several
widgets, so move it to a shared place.
2020-04-06 22:59:45 -04:00

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/* gtkpango.c - pango-related utilities
*
* Copyright (c) 2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.Free
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkpango.h"
#include <pango/pangocairo.h>
#include "gtkintl.h"
#include "gtkbuilderprivate.h"
static AtkAttributeSet *
add_attribute (AtkAttributeSet *attributes,
AtkTextAttribute attr,
const gchar *value)
{
AtkAttribute *at;
at = g_new (AtkAttribute, 1);
at->name = g_strdup (atk_text_attribute_get_name (attr));
at->value = g_strdup (value);
return g_slist_prepend (attributes, at);
}
/*
* _gtk_pango_get_default_attributes:
* @attributes: a #AtkAttributeSet to add the attributes to
* @layout: the #PangoLayout from which to get attributes
*
* Adds the default text attributes from @layout to @attributes,
* after translating them from Pango attributes to ATK attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*
* Returns: the modified @attributes
*/
AtkAttributeSet*
_gtk_pango_get_default_attributes (AtkAttributeSet *attributes,
PangoLayout *layout)
{
PangoContext *context;
gint i;
PangoWrapMode mode;
context = pango_layout_get_context (layout);
if (context)
{
PangoLanguage *language;
PangoFontDescription *font;
language = pango_context_get_language (context);
if (language)
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LANGUAGE,
pango_language_to_string (language));
font = pango_context_get_font_description (context);
if (font)
{
gchar buf[60];
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STYLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STYLE,
pango_font_description_get_style (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_VARIANT,
atk_text_attribute_get_value (ATK_TEXT_ATTR_VARIANT,
pango_font_description_get_variant (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRETCH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRETCH,
pango_font_description_get_stretch (font)));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FAMILY_NAME,
pango_font_description_get_family (font));
g_snprintf (buf, 60, "%d", pango_font_description_get_weight (font));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WEIGHT, buf);
g_snprintf (buf, 60, "%i", pango_font_description_get_size (font) / PANGO_SCALE);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SIZE, buf);
}
}
if (pango_layout_get_justify (layout))
{
i = 3;
}
else
{
PangoAlignment align;
align = pango_layout_get_alignment (layout);
if (align == PANGO_ALIGN_LEFT)
i = 0;
else if (align == PANGO_ALIGN_CENTER)
i = 2;
else /* PANGO_ALIGN_RIGHT */
i = 1;
}
attributes = add_attribute (attributes, ATK_TEXT_ATTR_JUSTIFICATION,
atk_text_attribute_get_value (ATK_TEXT_ATTR_JUSTIFICATION, i));
mode = pango_layout_get_wrap (layout);
if (mode == PANGO_WRAP_WORD)
i = 2;
else /* PANGO_WRAP_CHAR */
i = 1;
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WRAP_MODE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_WRAP_MODE, i));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRIKETHROUGH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRIKETHROUGH, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_UNDERLINE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RISE, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SCALE, "1");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_FULL_HEIGHT, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_INSIDE_WRAP, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_BELOW_LINES, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_PIXELS_ABOVE_LINES, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_EDITABLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_EDITABLE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_INVISIBLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_INVISIBLE, 0));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_INDENT, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RIGHT_MARGIN, "0");
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LEFT_MARGIN, "0");
return attributes;
}
/*
* _gtk_pango_get_run_attributes:
* @attributes: a #AtkAttributeSet to add attributes to
* @layout: the #PangoLayout to get the attributes from
* @offset: the offset at which the attributes are wanted
* @start_offset: return location for the starting offset
* of the current run
* @end_offset: return location for the ending offset of the
* current run
*
* Finds the “run” around index (i.e. the maximal range of characters
* where the set of applicable attributes remains constant) and
* returns the starting and ending offsets for it.
*
* The attributes for the run are added to @attributes, after
* translating them from Pango attributes to ATK attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*
* Returns: the modified #AtkAttributeSet
*/
AtkAttributeSet *
_gtk_pango_get_run_attributes (AtkAttributeSet *attributes,
PangoLayout *layout,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoAttrIterator *iter;
PangoAttrList *attr;
PangoAttrString *pango_string;
PangoAttrInt *pango_int;
PangoAttrColor *pango_color;
PangoAttrLanguage *pango_lang;
PangoAttrFloat *pango_float;
gint index, start_index, end_index;
gboolean is_next;
glong len;
const gchar *text;
gchar *value;
text = pango_layout_get_text (layout);
len = g_utf8_strlen (text, -1);
/* Grab the attributes of the PangoLayout, if any */
attr = pango_layout_get_attributes (layout);
if (attr == NULL)
{
*start_offset = 0;
*end_offset = len;
return attributes;
}
iter = pango_attr_list_get_iterator (attr);
/* Get invariant range offsets */
/* If offset out of range, set offset in range */
if (offset > len)
offset = len;
else if (offset < 0)
offset = 0;
index = g_utf8_offset_to_pointer (text, offset) - text;
pango_attr_iterator_range (iter, &start_index, &end_index);
is_next = TRUE;
while (is_next)
{
if (index >= start_index && index < end_index)
{
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
if (end_index == G_MAXINT) /* Last iterator */
end_index = len;
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
break;
}
is_next = pango_attr_iterator_next (iter);
pango_attr_iterator_range (iter, &start_index, &end_index);
}
/* Get attributes */
pango_string = (PangoAttrString*) pango_attr_iterator_get (iter, PANGO_ATTR_FAMILY);
if (pango_string != NULL)
{
value = g_strdup_printf ("%s", pango_string->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FAMILY_NAME, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STYLE);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STYLE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STYLE, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_WEIGHT);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_WEIGHT, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_VARIANT);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_VARIANT,
atk_text_attribute_get_value (ATK_TEXT_ATTR_VARIANT, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STRETCH);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRETCH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRETCH, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_SIZE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value / PANGO_SCALE);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SIZE, value);
g_free (value);
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_UNDERLINE);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_UNDERLINE,
atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_STRIKETHROUGH);
if (pango_int != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_STRIKETHROUGH,
atk_text_attribute_get_value (ATK_TEXT_ATTR_STRIKETHROUGH, pango_int->value));
}
pango_int = (PangoAttrInt*) pango_attr_iterator_get (iter, PANGO_ATTR_RISE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_RISE, value);
g_free (value);
}
pango_lang = (PangoAttrLanguage*) pango_attr_iterator_get (iter, PANGO_ATTR_LANGUAGE);
if (pango_lang != NULL)
{
attributes = add_attribute (attributes, ATK_TEXT_ATTR_LANGUAGE,
pango_language_to_string (pango_lang->value));
}
pango_float = (PangoAttrFloat*) pango_attr_iterator_get (iter, PANGO_ATTR_SCALE);
if (pango_float != NULL)
{
value = g_strdup_printf ("%g", pango_float->value);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_SCALE, value);
g_free (value);
}
pango_color = (PangoAttrColor*) pango_attr_iterator_get (iter, PANGO_ATTR_FOREGROUND);
if (pango_color != NULL)
{
value = g_strdup_printf ("%u,%u,%u",
pango_color->color.red,
pango_color->color.green,
pango_color->color.blue);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FG_COLOR, value);
g_free (value);
}
pango_color = (PangoAttrColor*) pango_attr_iterator_get (iter, PANGO_ATTR_BACKGROUND);
if (pango_color != NULL)
{
value = g_strdup_printf ("%u,%u,%u",
pango_color->color.red,
pango_color->color.green,
pango_color->color.blue);
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_COLOR, value);
g_free (value);
}
pango_attr_iterator_destroy (iter);
return attributes;
}
/*
* _gtk_pango_move_chars:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of characters to move from @offset
*
* Returns the position that is @count characters from the
* given @offset. @count may be positive or negative.
*
* For the purpose of this function, characters are defined
* by what Pango considers cursor positions.
*
* Returns: the new position
*/
static gint
_gtk_pango_move_chars (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_cursor_position);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_cursor_position);
count++;
}
return offset;
}
/*
* _gtk_pango_move_words:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of words to move from @offset
*
* Returns the position that is @count words from the
* given @offset. @count may be positive or negative.
*
* If @count is positive, the returned position will
* be a word end, otherwise it will be a word start.
* See the Pango documentation for details on how
* word starts and ends are defined.
*
* Returns: the new position
*/
static gint
_gtk_pango_move_words (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_word_end);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_word_start);
count++;
}
return offset;
}
/*
* _gtk_pango_move_sentences:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
* @count: the number of sentences to move from @offset
*
* Returns the position that is @count sentences from the
* given @offset. @count may be positive or negative.
*
* If @count is positive, the returned position will
* be a sentence end, otherwise it will be a sentence start.
* See the Pango documentation for details on how
* sentence starts and ends are defined.
*
* Returns: the new position
*/
static gint
_gtk_pango_move_sentences (PangoLayout *layout,
gint offset,
gint count)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (count > 0 && offset < n_attrs - 1)
{
do
offset++;
while (offset < n_attrs - 1 && !attrs[offset].is_sentence_end);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !attrs[offset].is_sentence_start);
count++;
}
return offset;
}
/*
* _gtk_pango_is_inside_word:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
*
* Returns whether the given position is inside
* a word.
*
* Returns: %TRUE if @offset is inside a word
*/
static gboolean
_gtk_pango_is_inside_word (PangoLayout *layout,
gint offset)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (offset >= 0 &&
!(attrs[offset].is_word_start || attrs[offset].is_word_end))
offset--;
if (offset >= 0)
return attrs[offset].is_word_start;
return FALSE;
}
/*
* _gtk_pango_is_inside_sentence:
* @layout: a #PangoLayout
* @offset: a character offset in @layout
*
* Returns whether the given position is inside
* a sentence.
*
* Returns: %TRUE if @offset is inside a sentence
*/
static gboolean
_gtk_pango_is_inside_sentence (PangoLayout *layout,
gint offset)
{
const PangoLogAttr *attrs;
gint n_attrs;
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
while (offset >= 0 &&
!(attrs[offset].is_sentence_start || attrs[offset].is_sentence_end))
offset--;
if (offset >= 0)
return attrs[offset].is_sentence_start;
return FALSE;
}
static void
pango_layout_get_line_before (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL, *prev_prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
if (prev_line)
{
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
end_index = start_index;
start_index = prev_line->start_index;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (prev_prev_line)
start_index = prev_prev_line->start_index + prev_prev_line->length;
else
start_index = 0;
end_index = prev_line->start_index + prev_line->length;
break;
case ATK_TEXT_BOUNDARY_CHAR:
case ATK_TEXT_BOUNDARY_WORD_START:
case ATK_TEXT_BOUNDARY_WORD_END:
case ATK_TEXT_BOUNDARY_SENTENCE_START:
case ATK_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
break;
}
}
else
start_index = end_index = 0;
found = TRUE;
break;
}
prev_prev_line = prev_line;
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
}
static void
pango_layout_get_line_at (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_iter_get_line (iter)->start_index;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
if (prev_line)
start_index = prev_line->start_index + prev_line->length;
break;
case ATK_TEXT_BOUNDARY_CHAR:
case ATK_TEXT_BOUNDARY_WORD_START:
case ATK_TEXT_BOUNDARY_WORD_END:
case ATK_TEXT_BOUNDARY_SENTENCE_START:
case ATK_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
break;
}
found = TRUE;
break;
}
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
}
static void
pango_layout_get_line_after (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL;
gint index, start_index, end_index;
const gchar *text;
gboolean found = FALSE;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
iter = pango_layout_get_iter (layout);
do
{
line = pango_layout_iter_get_line (iter);
start_index = line->start_index;
end_index = start_index + line->length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
if (pango_layout_iter_next_line (iter))
{
line = pango_layout_iter_get_line (iter);
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_LINE_START:
start_index = line->start_index;
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_iter_get_line (iter)->start_index;
else
end_index = start_index + line->length;
break;
case ATK_TEXT_BOUNDARY_LINE_END:
start_index = end_index;
end_index = line->start_index + line->length;
break;
case ATK_TEXT_BOUNDARY_CHAR:
case ATK_TEXT_BOUNDARY_WORD_START:
case ATK_TEXT_BOUNDARY_WORD_END:
case ATK_TEXT_BOUNDARY_SENTENCE_START:
case ATK_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
break;
}
}
else
start_index = end_index;
found = TRUE;
break;
}
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_line->start_index + prev_line->length;
end_index = start_index;
}
pango_layout_iter_free (iter);
*start_offset = g_utf8_pointer_to_offset (text, text + start_index);
*end_offset = g_utf8_pointer_to_offset (text, text + end_index);
}
/*
* _gtk_pango_get_text_before:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout before @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_before_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_before (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
end = start;
start = _gtk_pango_move_words (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (_gtk_pango_is_inside_word (layout, start) &&
!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = start;
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
end = start;
start = _gtk_pango_move_sentences (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (_gtk_pango_is_inside_sentence (layout, start) &&
!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = start;
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_before (layout, boundary_type, offset, &start, &end);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
/*
* _gtk_pango_get_text_after:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout after @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_after_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_after (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
start = _gtk_pango_move_chars (layout, start, 1);
end = start;
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (_gtk_pango_is_inside_word (layout, end))
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
start = end;
if (end < n_attrs - 1)
{
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
}
break;
case ATK_TEXT_BOUNDARY_WORD_END:
end = _gtk_pango_move_words (layout, end, 1);
start = end;
if (end < n_attrs - 1)
end = _gtk_pango_move_words (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (_gtk_pango_is_inside_sentence (layout, end))
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
start = end;
if (end < n_attrs - 1)
{
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
}
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
end = _gtk_pango_move_sentences (layout, end, 1);
start = end;
if (end < n_attrs - 1)
end = _gtk_pango_move_sentences (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_after (layout, boundary_type, offset, &start, &end);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
/*
* _gtk_pango_get_text_at:
* @layout: a #PangoLayout
* @boundary_type: a #AtkTextBoundary
* @offset: a character offset in @layout
* @start_offset: return location for the start of the returned text
* @end_offset: return location for the end of the return text
*
* Gets a slice of the text from @layout at @offset.
*
* The @boundary_type determines the size of the returned slice of
* text. For the exact semantics of this function, see
* atk_text_get_text_after_offset().
*
* Returns: a newly allocated string containing a slice of text
* from layout. Free with g_free().
*/
gchar *
_gtk_pango_get_text_at (PangoLayout *layout,
AtkTextBoundary boundary_type,
gint offset,
gint *start_offset,
gint *end_offset)
{
const gchar *text;
gint start, end;
const PangoLogAttr *attrs;
gint n_attrs;
text = pango_layout_get_text (layout);
if (text[0] == 0)
{
*start_offset = 0;
*end_offset = 0;
return g_strdup ("");
}
attrs = pango_layout_get_log_attrs_readonly (layout, &n_attrs);
start = offset;
end = start;
switch (boundary_type)
{
case ATK_TEXT_BOUNDARY_CHAR:
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_START:
if (!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
if (_gtk_pango_is_inside_word (layout, end))
end = _gtk_pango_move_words (layout, end, 1);
while (!attrs[end].is_word_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_WORD_END:
if (_gtk_pango_is_inside_word (layout, start) &&
!attrs[start].is_word_start)
start = _gtk_pango_move_words (layout, start, -1);
while (!attrs[start].is_word_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = _gtk_pango_move_words (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_START:
if (!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
if (_gtk_pango_is_inside_sentence (layout, end))
end = _gtk_pango_move_sentences (layout, end, 1);
while (!attrs[end].is_sentence_start && end < n_attrs - 1)
end = _gtk_pango_move_chars (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_SENTENCE_END:
if (_gtk_pango_is_inside_sentence (layout, start) &&
!attrs[start].is_sentence_start)
start = _gtk_pango_move_sentences (layout, start, -1);
while (!attrs[start].is_sentence_end && start > 0)
start = _gtk_pango_move_chars (layout, start, -1);
end = _gtk_pango_move_sentences (layout, end, 1);
break;
case ATK_TEXT_BOUNDARY_LINE_START:
case ATK_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_at (layout, boundary_type, offset, &start, &end);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}
static gboolean
attr_list_merge_filter (PangoAttribute *attribute,
gpointer list)
{
pango_attr_list_change (list, pango_attribute_copy (attribute));
return FALSE;
}
/*
* _gtk_pango_attr_list_merge:
* @into: a #PangoAttrList where attributes are merged or %NULL
* @from: a #PangoAttrList with the attributes to merge or %NULL
*
* Merges attributes from @from into @into.
*
* Returns: the merged list.
*/
PangoAttrList *
_gtk_pango_attr_list_merge (PangoAttrList *into,
PangoAttrList *from)
{
if (from)
{
if (into)
pango_attr_list_filter (from, attr_list_merge_filter, into);
else
return pango_attr_list_ref (from);
}
return into;
}
static PangoAttribute *
attribute_from_text (GtkBuilder *builder,
const char *name,
const char *value,
GError **error)
{
PangoAttribute *attribute = NULL;
PangoAttrType type;
PangoLanguage *language;
PangoFontDescription *font_desc;
GdkRGBA *color;
GValue val = G_VALUE_INIT;
if (!gtk_builder_value_from_string_type (builder, PANGO_TYPE_ATTR_TYPE, name, &val, error))
return NULL;
type = g_value_get_enum (&val);
g_value_unset (&val);
switch (type)
{
/* PangoAttrLanguage */
case PANGO_ATTR_LANGUAGE:
if ((language = pango_language_from_string (value)))
{
attribute = pango_attr_language_new (language);
g_value_init (&val, G_TYPE_INT);
}
break;
/* PangoAttrInt */
case PANGO_ATTR_STYLE:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_STYLE, value, &val, error))
attribute = pango_attr_style_new (g_value_get_enum (&val));
break;
case PANGO_ATTR_WEIGHT:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_WEIGHT, value, &val, error))
attribute = pango_attr_weight_new (g_value_get_enum (&val));
break;
case PANGO_ATTR_VARIANT:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_VARIANT, value, &val, error))
attribute = pango_attr_variant_new (g_value_get_enum (&val));
break;
case PANGO_ATTR_STRETCH:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_STRETCH, value, &val, error))
attribute = pango_attr_stretch_new (g_value_get_enum (&val));
break;
case PANGO_ATTR_UNDERLINE:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_UNDERLINE, value, &val, NULL))
attribute = pango_attr_underline_new (g_value_get_enum (&val));
else
{
/* XXX: allow boolean for backwards compat, so ignore error */
/* Deprecate this somehow */
g_value_unset (&val);
if (gtk_builder_value_from_string_type (builder, G_TYPE_BOOLEAN, value, &val, error))
attribute = pango_attr_underline_new (g_value_get_boolean (&val));
}
break;
case PANGO_ATTR_STRIKETHROUGH:
if (gtk_builder_value_from_string_type (builder, G_TYPE_BOOLEAN, value, &val, error))
attribute = pango_attr_strikethrough_new (g_value_get_boolean (&val));
break;
case PANGO_ATTR_GRAVITY:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_GRAVITY, value, &val, error))
attribute = pango_attr_gravity_new (g_value_get_enum (&val));
break;
case PANGO_ATTR_GRAVITY_HINT:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_GRAVITY_HINT, value, &val, error))
attribute = pango_attr_gravity_hint_new (g_value_get_enum (&val));
break;
/* PangoAttrString */
case PANGO_ATTR_FAMILY:
attribute = pango_attr_family_new (value);
g_value_init (&val, G_TYPE_INT);
break;
/* PangoAttrSize */
case PANGO_ATTR_SIZE:
if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
attribute = pango_attr_size_new (g_value_get_int (&val));
break;
case PANGO_ATTR_ABSOLUTE_SIZE:
if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
attribute = pango_attr_size_new_absolute (g_value_get_int (&val));
break;
/* PangoAttrFontDesc */
case PANGO_ATTR_FONT_DESC:
if ((font_desc = pango_font_description_from_string (value)))
{
attribute = pango_attr_font_desc_new (font_desc);
pango_font_description_free (font_desc);
g_value_init (&val, G_TYPE_INT);
}
break;
/* PangoAttrColor */
case PANGO_ATTR_FOREGROUND:
if (gtk_builder_value_from_string_type (builder, GDK_TYPE_RGBA, value, &val, error))
{
color = g_value_get_boxed (&val);
attribute = pango_attr_foreground_new (color->red * 65535,
color->green * 65535,
color->blue * 65535);
}
break;
case PANGO_ATTR_BACKGROUND:
if (gtk_builder_value_from_string_type (builder, GDK_TYPE_RGBA, value, &val, error))
{
color = g_value_get_boxed (&val);
attribute = pango_attr_background_new (color->red * 65535,
color->green * 65535,
color->blue * 65535);
}
break;
case PANGO_ATTR_UNDERLINE_COLOR:
if (gtk_builder_value_from_string_type (builder, GDK_TYPE_RGBA, value, &val, error))
{
color = g_value_get_boxed (&val);
attribute = pango_attr_underline_color_new (color->red * 65535,
color->green * 65535,
color->blue * 65535);
}
break;
case PANGO_ATTR_STRIKETHROUGH_COLOR:
if (gtk_builder_value_from_string_type (builder, GDK_TYPE_RGBA, value, &val, error))
{
color = g_value_get_boxed (&val);
attribute = pango_attr_strikethrough_color_new (color->red * 65535,
color->green * 65535,
color->blue * 65535);
}
break;
/* PangoAttrShape */
case PANGO_ATTR_SHAPE:
/* Unsupported for now */
break;
/* PangoAttrFloat */
case PANGO_ATTR_SCALE:
if (gtk_builder_value_from_string_type (builder, G_TYPE_DOUBLE, value, &val, error))
attribute = pango_attr_scale_new (g_value_get_double (&val));
break;
case PANGO_ATTR_LETTER_SPACING:
if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
attribute = pango_attr_letter_spacing_new (g_value_get_int (&val));
break;
case PANGO_ATTR_RISE:
if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
attribute = pango_attr_rise_new (g_value_get_int (&val));
break;
case PANGO_ATTR_FALLBACK:
if (gtk_builder_value_from_string_type (builder, G_TYPE_BOOLEAN, value, &val, error))
attribute = pango_attr_fallback_new (g_value_get_boolean (&val));
break;
case PANGO_ATTR_FONT_FEATURES:
attribute = pango_attr_font_features_new (value);
break;
case PANGO_ATTR_FOREGROUND_ALPHA:
if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
attribute = pango_attr_foreground_alpha_new ((guint16)g_value_get_int (&val));
break;
case PANGO_ATTR_BACKGROUND_ALPHA:
if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
attribute = pango_attr_background_alpha_new ((guint16)g_value_get_int (&val));
break;
#if PANGO_VERSION_CHECK(1,44,0)
case PANGO_ATTR_ALLOW_BREAKS:
if (gtk_builder_value_from_string_type (builder, G_TYPE_BOOLEAN, value, &val, error))
attribute = pango_attr_allow_breaks_new (g_value_get_boolean (&val));
break;
case PANGO_ATTR_SHOW:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_SHOW_FLAGS, value, &val, error))
attribute = pango_attr_show_new (g_value_get_flags (&val));
break;
case PANGO_ATTR_INSERT_HYPHENS:
if (gtk_builder_value_from_string_type (builder, G_TYPE_BOOLEAN, value, &val, error))
attribute = pango_attr_insert_hyphens_new (g_value_get_boolean (&val));
break;
#endif
#if PANGO_VERSION_CHECK(1,45,0)
case PANGO_ATTR_OVERLINE:
if (gtk_builder_value_from_string_type (builder, PANGO_TYPE_OVERLINE, value, &val, NULL))
attribute = pango_attr_overline_new (g_value_get_enum (&val));
break;
case PANGO_ATTR_OVERLINE_COLOR:
if (gtk_builder_value_from_string_type (builder, GDK_TYPE_RGBA, value, &val, error))
{
color = g_value_get_boxed (&val);
attribute = pango_attr_overline_color_new (color->red * 65535,
color->green * 65535,
color->blue * 65535);
}
break;
#endif
case PANGO_ATTR_INVALID:
default:
break;
}
g_value_unset (&val);
return attribute;
}
void
gtk_pango_attribute_start_element (GtkBuildableParseContext *context,
const char *element_name,
const char **names,
const char **values,
gpointer user_data,
GError **error)
{
GtkPangoAttributeParserData *data = user_data;
if (strcmp (element_name, "attribute") == 0)
{
PangoAttribute *attr = NULL;
const char *name = NULL;
const char *value = NULL;
const char *start = NULL;
const char *end = NULL;
guint start_val = 0;
guint end_val = G_MAXUINT;
GValue val = G_VALUE_INIT;
if (!_gtk_builder_check_parent (data->builder, context, "attributes", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_STRING, "name", &name,
G_MARKUP_COLLECT_STRING, "value", &value,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "start", &start,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "end", &end,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
if (start)
{
if (!gtk_builder_value_from_string_type (data->builder, G_TYPE_UINT, start, &val, error))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
start_val = g_value_get_uint (&val);
g_value_unset (&val);
}
if (end)
{
if (!gtk_builder_value_from_string_type (data->builder, G_TYPE_UINT, end, &val, error))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
end_val = g_value_get_uint (&val);
g_value_unset (&val);
}
attr = attribute_from_text (data->builder, name, value, error);
if (!attr)
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
attr->start_index = start_val;
attr->end_index = end_val;
if (!data->attrs)
data->attrs = pango_attr_list_new ();
pango_attr_list_insert (data->attrs, attr);
}
else if (strcmp (element_name, "attributes") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "object", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_INVALID, NULL, NULL,
G_MARKUP_COLLECT_INVALID))
_gtk_builder_prefix_error (data->builder, context, error);
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkContainer", element_name,
error);
}
}
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