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Learning_GTK4_tree/gtk/a11y/gtkatspipango.c

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2023-12-12 11:36:42 +01:00
/* gtkatspipango.c - pango-related utilities for AT-SPI
*
* 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
*/
#include "config.h"
#include "gtkatspipangoprivate.h"
#include "gtkpangoprivate.h"
void
gtk_pango_get_font_attributes (PangoFontDescription *font,
GVariantBuilder *builder)
{
char buf[60];
g_variant_builder_add (builder, "{ss}", "style",
pango_style_to_string (pango_font_description_get_style (font)));
g_variant_builder_add (builder, "{ss}", "variant",
pango_variant_to_string (pango_font_description_get_variant (font)));
g_variant_builder_add (builder, "{ss}", "stretch",
pango_stretch_to_string (pango_font_description_get_stretch (font)));
g_variant_builder_add (builder, "{ss}", "family-name",
pango_font_description_get_family (font));
g_snprintf (buf, 60, "%d", pango_font_description_get_weight (font));
g_variant_builder_add (builder, "{ss}", "weight", buf);
g_snprintf (buf, 60, "%i", pango_font_description_get_size (font) / PANGO_SCALE);
g_variant_builder_add (builder, "{ss}", "size", buf);
}
/*
* gtk_pango_get_default_attributes:
* @layout: the `PangoLayout` from which to get attributes
* @builder: a `GVariantBuilder` to add to
*
* Adds the default text attributes from @layout to @builder,
* after translating them from Pango attributes to atspi
* 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
*/
void
gtk_pango_get_default_attributes (PangoLayout *layout,
GVariantBuilder *builder)
{
PangoContext *context;
context = pango_layout_get_context (layout);
if (context)
{
PangoLanguage *language;
PangoFontDescription *font;
language = pango_context_get_language (context);
if (language)
g_variant_builder_add (builder, "{ss}", "language",
pango_language_to_string (language));
font = pango_context_get_font_description (context);
if (font)
gtk_pango_get_font_attributes (font, builder);
}
g_variant_builder_add (builder, "{ss}", "justification",
pango_align_to_string (pango_layout_get_alignment (layout)));
g_variant_builder_add (builder, "{ss}", "wrap-mode",
pango_wrap_mode_to_string (pango_layout_get_wrap (layout)));
g_variant_builder_add (builder, "{ss}", "strikethrough", "false");
g_variant_builder_add (builder, "{ss}", "underline", "false");
g_variant_builder_add (builder, "{ss}", "rise", "0");
g_variant_builder_add (builder, "{ss}", "scale", "1");
g_variant_builder_add (builder, "{ss}", "bg-full-height", "0");
g_variant_builder_add (builder, "{ss}", "pixels-inside-wrap", "0");
g_variant_builder_add (builder, "{ss}", "pixels-below-lines", "0");
g_variant_builder_add (builder, "{ss}", "pixels-above-lines", "0");
g_variant_builder_add (builder, "{ss}", "editable", "false");
g_variant_builder_add (builder, "{ss}", "invisible", "false");
g_variant_builder_add (builder, "{ss}", "indent", "0");
g_variant_builder_add (builder, "{ss}", "right-margin", "0");
g_variant_builder_add (builder, "{ss}", "left-margin", "0");
}
/*
* gtk_pango_get_run_attributes:
* @layout: the `PangoLayout` to get the attributes from
* @builder: `GVariantBuilder` to add to
* @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 atspi attributes.
*
* This is a convenience function that can be used to implement
* support for the #AtkText interface in widgets using Pango
* layouts.
*/
void
gtk_pango_get_run_attributes (PangoLayout *layout,
GVariantBuilder *builder,
int offset,
int *start_offset,
int *end_offset)
{
PangoAttrIterator *iter;
PangoAttrList *attr;
PangoAttrString *pango_string;
PangoAttrInt *pango_int;
PangoAttrColor *pango_color;
PangoAttrLanguage *pango_lang;
PangoAttrFloat *pango_float;
int index, start_index, end_index;
gboolean is_next;
glong len;
const char *text;
char *value;
const char *val;
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;
}
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);
g_variant_builder_add (builder, "{ss}", "family-name", value);
g_free (value);
}
pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_STYLE);
if (pango_int != NULL)
g_variant_builder_add (builder, "{ss}", "style", pango_style_to_string (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);
g_variant_builder_add (builder, "{ss}", "weight", value);
g_free (value);
}
pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_VARIANT);
if (pango_int != NULL)
g_variant_builder_add (builder, "{ss}", "variant",
pango_variant_to_string (pango_int->value));
pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_STRETCH);
if (pango_int != NULL)
g_variant_builder_add (builder, "{ss}", "stretch",
pango_stretch_to_string (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);
g_variant_builder_add (builder, "{ss}", "size", value);
g_free (value);
}
pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_UNDERLINE);
if (pango_int != NULL)
g_variant_builder_add (builder, "{ss}", "underline",
pango_underline_to_string (pango_int->value));
pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_STRIKETHROUGH);
if (pango_int != NULL)
{
if (pango_int->value)
val = "true";
else
val = "false";
g_variant_builder_add (builder, "{ss}", "strikethrough", val);
}
pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_RISE);
if (pango_int != NULL)
{
value = g_strdup_printf ("%i", pango_int->value);
g_variant_builder_add (builder, "{ss}", "rise", value);
g_free (value);
}
pango_lang = (PangoAttrLanguage *) pango_attr_iterator_get (iter, PANGO_ATTR_LANGUAGE);
if (pango_lang != NULL)
{
g_variant_builder_add (builder, "{ss}", "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);
g_variant_builder_add (builder, "{ss}", "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);
g_variant_builder_add (builder, "{ss}", "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);
g_variant_builder_add (builder, "{ss}", "bg-color", value);
g_free (value);
}
pango_attr_iterator_destroy (iter);
}
/*
* 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 int
gtk_pango_move_chars (PangoLayout *layout,
int offset,
int count)
{
const PangoLogAttr *attrs;
int 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 int
gtk_pango_move_words (PangoLayout *layout,
int offset,
int count)
{
const PangoLogAttr *attrs;
int 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 int
gtk_pango_move_sentences (PangoLayout *layout,
int offset,
int count)
{
const PangoLogAttr *attrs;
int 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;
}
#if 0
/*
* gtk_pango_move_lines:
* @layout: a `PangoLayout`
* @offset: a character offset in @layout
* @count: the number of lines to move from @offset
*
* Returns the position that is @count lines from the
* given @offset. @count may be positive or negative.
*
* If @count is negative, the returned position will
* be the start of a line, else it will be the end of
* line.
*
* Returns: the new position
*/
static int
gtk_pango_move_lines (PangoLayout *layout,
int offset,
int count)
{
GSList *lines, *l;
PangoLayoutLine *line;
int num;
const char *text;
int pos, line_pos;
int index;
int len;
text = pango_layout_get_text (layout);
index = g_utf8_offset_to_pointer (text, offset) - text;
lines = pango_layout_get_lines (layout);
line = NULL;
num = 0;
for (l = lines; l; l = l->next)
{
line = l->data;
if (index < line->start_index + line->length)
break;
num++;
}
if (count < 0)
{
num += count;
if (num < 0)
num = 0;
line = g_slist_nth_data (lines, num);
return g_utf8_pointer_to_offset (text, text + line->start_index);
}
else
{
line_pos = index - line->start_index;
len = g_slist_length (lines);
num += count;
if (num >= len || (count == 0 && num == len - 1))
return g_utf8_strlen (text, -1) - 1;
line = l->data;
pos = line->start_index + line_pos;
if (pos >= line->start_index + line->length)
pos = line->start_index + line->length - 1;
return g_utf8_pointer_to_offset (text, text + pos);
}
}
#endif
/*
* 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,
int offset)
{
const PangoLogAttr *attrs;
int 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,
int offset)
{
const PangoLogAttr *attrs;
int 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,
int offset,
AtspiTextBoundaryType boundary_type,
int *start_offset,
int *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL, *prev_prev_line = NULL;
int index, start_index, length, end_index;
int prev_start_index, prev_length;
int prev_prev_start_index, prev_prev_length;
const char *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 = pango_layout_line_get_start_index (line);
length = pango_layout_line_get_length (line);
end_index = start_index + length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
if (prev_line)
{
switch (boundary_type)
{
case ATSPI_TEXT_BOUNDARY_LINE_START:
end_index = start_index;
start_index = prev_start_index;
break;
case ATSPI_TEXT_BOUNDARY_LINE_END:
if (prev_prev_line)
start_index = prev_prev_start_index + prev_prev_length;
else
start_index = 0;
end_index = prev_start_index + prev_length;
break;
case ATSPI_TEXT_BOUNDARY_CHAR:
case ATSPI_TEXT_BOUNDARY_WORD_START:
case ATSPI_TEXT_BOUNDARY_WORD_END:
case ATSPI_TEXT_BOUNDARY_SENTENCE_START:
case ATSPI_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
}
}
else
start_index = end_index = 0;
found = TRUE;
break;
}
prev_prev_line = prev_line;
prev_prev_start_index = prev_start_index;
prev_prev_length = prev_length;
prev_line = line;
prev_start_index = start_index;
prev_length = length;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = prev_start_index + prev_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,
int offset,
AtspiTextBoundaryType boundary_type,
int *start_offset,
int *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL;
int index, start_index, length, end_index;
const char *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 = pango_layout_line_get_start_index (line);
length = pango_layout_line_get_length (line);
end_index = start_index + length;
if (index >= start_index && index <= end_index)
{
/* Found line for offset */
switch (boundary_type)
{
case ATSPI_TEXT_BOUNDARY_LINE_START:
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_line_get_start_index (pango_layout_iter_get_line (iter));
break;
case ATSPI_TEXT_BOUNDARY_LINE_END:
if (prev_line)
start_index = pango_layout_line_get_start_index (prev_line) + pango_layout_line_get_length (prev_line);
break;
case ATSPI_TEXT_BOUNDARY_CHAR:
case ATSPI_TEXT_BOUNDARY_WORD_START:
case ATSPI_TEXT_BOUNDARY_WORD_END:
case ATSPI_TEXT_BOUNDARY_SENTENCE_START:
case ATSPI_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
}
found = TRUE;
break;
}
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = pango_layout_line_get_start_index (prev_line) + pango_layout_line_get_length (prev_line);
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,
int offset,
AtspiTextBoundaryType boundary_type,
int *start_offset,
int *end_offset)
{
PangoLayoutIter *iter;
PangoLayoutLine *line, *prev_line = NULL;
int index, start_index, length, end_index;
const char *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 = pango_layout_line_get_start_index (line);
length = pango_layout_line_get_length (line);
end_index = start_index + 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 ATSPI_TEXT_BOUNDARY_LINE_START:
start_index = pango_layout_line_get_start_index (line);
if (pango_layout_iter_next_line (iter))
end_index = pango_layout_line_get_start_index (pango_layout_iter_get_line (iter));
else
end_index = start_index + pango_layout_line_get_length (line);
break;
case ATSPI_TEXT_BOUNDARY_LINE_END:
start_index = end_index;
end_index = pango_layout_line_get_start_index (line) + pango_layout_line_get_length (line);
break;
case ATSPI_TEXT_BOUNDARY_CHAR:
case ATSPI_TEXT_BOUNDARY_WORD_START:
case ATSPI_TEXT_BOUNDARY_WORD_END:
case ATSPI_TEXT_BOUNDARY_SENTENCE_START:
case ATSPI_TEXT_BOUNDARY_SENTENCE_END:
default:
g_assert_not_reached();
}
}
else
start_index = end_index;
found = TRUE;
break;
}
prev_line = line;
}
while (pango_layout_iter_next_line (iter));
if (!found)
{
start_index = pango_layout_line_get_start_index (prev_line) + pango_layout_line_get_length (prev_line);
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`
* @offset: a character offset in @layout
* @boundary_type: a #AtspiTextBoundaryType
* @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().
*/
char *
gtk_pango_get_text_before (PangoLayout *layout,
int offset,
AtspiTextBoundaryType boundary_type,
int *start_offset,
int *end_offset)
{
const char *text;
int start, end;
const PangoLogAttr *attrs;
int 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 ATSPI_TEXT_BOUNDARY_CHAR:
start = gtk_pango_move_chars (layout, start, -1);
break;
case ATSPI_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 ATSPI_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 ATSPI_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 ATSPI_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 ATSPI_TEXT_BOUNDARY_LINE_START:
case ATSPI_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_before (layout, offset, boundary_type, &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`
* @offset: a character offset in @layout
* @boundary_type: a #AtspiTextBoundaryType
* @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().
*/
char *
gtk_pango_get_text_after (PangoLayout *layout,
int offset,
AtspiTextBoundaryType boundary_type,
int *start_offset,
int *end_offset)
{
const char *text;
int start, end;
const PangoLogAttr *attrs;
int 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 ATSPI_TEXT_BOUNDARY_CHAR:
start = gtk_pango_move_chars (layout, start, 1);
end = start;
end = gtk_pango_move_chars (layout, end, 1);
break;
case ATSPI_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 ATSPI_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 ATSPI_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 ATSPI_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 ATSPI_TEXT_BOUNDARY_LINE_START:
case ATSPI_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_after (layout, offset, boundary_type, &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`
* @offset: a character offset in @layout
* @boundary_type: a `AtspiTextBoundaryType`
* @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().
*/
char *
gtk_pango_get_text_at (PangoLayout *layout,
int offset,
AtspiTextBoundaryType boundary_type,
int *start_offset,
int *end_offset)
{
const char *text;
int start, end;
const PangoLogAttr *attrs;
int 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 ATSPI_TEXT_BOUNDARY_CHAR:
end = gtk_pango_move_chars (layout, end, 1);
break;
case ATSPI_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 ATSPI_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 ATSPI_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 ATSPI_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 ATSPI_TEXT_BOUNDARY_LINE_START:
case ATSPI_TEXT_BOUNDARY_LINE_END:
pango_layout_get_line_at (layout, offset, boundary_type, &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);
}
char *gtk_pango_get_string_at (PangoLayout *layout,
int offset,
AtspiTextGranularity granularity,
int *start_offset,
int *end_offset)
{
const char *text;
int start, end;
const PangoLogAttr *attrs;
int 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 (granularity)
{
case ATSPI_TEXT_GRANULARITY_CHAR:
end = gtk_pango_move_chars (layout, end, 1);
break;
case ATSPI_TEXT_GRANULARITY_WORD:
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 ATSPI_TEXT_GRANULARITY_SENTENCE:
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 ATSPI_TEXT_GRANULARITY_LINE:
pango_layout_get_line_at (layout, offset, ATSPI_TEXT_BOUNDARY_LINE_START, &start, &end);
break;
case ATSPI_TEXT_GRANULARITY_PARAGRAPH:
/* FIXME: In theory, a layout can hold more than one paragraph */
start = 0;
end = g_utf8_strlen (text, -1);
break;
default:
g_assert_not_reached ();
break;
}
*start_offset = start;
*end_offset = end;
g_assert (start <= end);
return g_utf8_substring (text, start, end);
}