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/* Pango
* break.c:
*
* Copyright (C) 1999 Red Hat Software
*
* 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.
*/
#include "pango.h"
#include "pango-modules.h"
/**
* pango_break:
* @text: the text to process
* @length: the length (in bytes) of @text
* @analysis: #PangoAnalysis structure from PangoItemize
* @attrs: an array to store character information in
*
* Determines possible line, word, and character breaks
* for a string of Unicode text.
*/
void pango_break (const gchar *text,
gint length,
PangoAnalysis *analysis,
PangoLogAttr *attrs)
{
/* Pseudo-implementation */
const gchar *cur = text;
gint i = 0;
gunichar wc;
while (*cur && cur - text < length)
{
wc = g_utf8_get_char (cur);
if (wc == (gunichar)-1)
break; /* FIXME: ERROR */
attrs[i].is_white = (wc == ' ' || wc == '\t' || wc == '\n' || wc == 0x200b) ? 1 : 0;
attrs[i].is_break = i == 0 || attrs[i-1].is_white || attrs[i].is_white;
attrs[i].is_char_stop = 1;
attrs[i].is_word_stop = ((i == 0) || attrs[i-1].is_white) && !attrs[i].is_white;
i++;
cur = g_utf8_next_char (cur);
}
}
/**
* pango_get_log_attrs:
* @text: text to process
* @length: length in bytes of @text
* @level: embedding level, or -1 if unknown
* @language: language code
* @log_attrs: array with one PangoLogAttr per character in @text, to be filled in
*
* Computes a PangoLogAttr for each character in @text
*/
void
pango_get_log_attrs (const char *text,
int length,
int level,
const char *language,
PangoLogAttr *log_attrs)
{
int n_chars;
PangoMap *lang_map;
int chars_broken;
const char *pos;
const char *end;
PangoEngineLang* range_engine;
const char *range_start;
int chars_in_range;
static guint engine_type_id = 0;
static guint render_type_id = 0;
PangoAnalysis analysis = { NULL, NULL, NULL, (guint8)level };
g_return_if_fail (length == 0 || text != NULL);
g_return_if_fail (log_attrs != NULL);
if (length == 0)
return;
if (engine_type_id == 0)
{
engine_type_id = g_quark_from_static_string (PANGO_ENGINE_TYPE_LANG);
render_type_id = g_quark_from_static_string (PANGO_RENDER_TYPE_NONE);
}
n_chars = g_utf8_strlen (text, length);
lang_map = pango_find_map (language, engine_type_id, render_type_id);
range_start = text;
range_engine = (PangoEngineLang*) pango_map_get_engine (lang_map,
g_utf8_get_char (text));
analysis.lang_engine = range_engine;
chars_broken = 0;
chars_in_range = 1;
end = text + length;
pos = g_utf8_next_char (text);
while (pos != end)
{
analysis.lang_engine =
(PangoEngineLang*) pango_map_get_engine (lang_map,
g_utf8_get_char (pos));
if (range_engine != analysis.lang_engine)
{
/* Engine has changed; do the breaking for the current range,
* then start a new range.
*/
pango_break (range_start,
pos - range_start,
&analysis,
log_attrs + chars_broken);
chars_broken += chars_in_range;
range_start = pos;
range_engine = analysis.lang_engine;
chars_in_range = 1;
}
else
{
chars_in_range += 1;
}
pos = g_utf8_next_char (pos);
}
g_assert (chars_in_range > 0);
g_assert (range_start != end);
g_assert (pos == end);
g_assert (range_engine == analysis.lang_engine);
pango_break (range_start,
end - range_start,
&analysis,
log_attrs + chars_broken);
}
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