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/* Pango
* indic-lang.c:
*
* Copyright (C) 2006 Red Hat Software
* Author: Akira TAGOH <tagoh@redhat.com>
*
* 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 <config.h>
#include <string.h>
#include "pango-engine.h"
#include "pango-break.h"
typedef PangoEngineLang IndicEngineLang;
typedef PangoEngineLangClass IndicEngineLangClass;
#define ENGINE_SUFFIX "IndicScriptEngineLang"
#define RENDER_TYPE PANGO_RENDER_TYPE_NONE
#define INDIC_ENGINE_INFO(script) \
{#script ENGINE_SUFFIX, PANGO_ENGINE_TYPE_LANG, RENDER_TYPE, script##_scripts, G_N_ELEMENTS(script##_scripts)}
static PangoEngineScriptInfo deva_scripts[] = {
{ PANGO_SCRIPT_DEVANAGARI, "*" }
};
static PangoEngineScriptInfo sinh_scripts[] = {
{ PANGO_SCRIPT_SINHALA, "*" }
};
static PangoEngineInfo script_engines[] = {
INDIC_ENGINE_INFO(deva),
INDIC_ENGINE_INFO(sinh)
};
static void
indic_engine_break (PangoEngineLang *engine,
const char *text,
int length,
PangoAnalysis *analysis,
PangoLogAttr *attrs,
int attrs_len)
{
const gchar *p, *next = NULL, *next_next;
gunichar prev_wc, this_wc, next_wc, next_next_wc;
gboolean makes_rephaya_syllable = FALSE;
int i;
for (p = text, prev_wc = 0, i = 0;
p != NULL && p < (text + length);
p = next, prev_wc = this_wc, i++)
{
this_wc = g_utf8_get_char (p);
next = g_utf8_next_char (p);
if (next != NULL && next < (text + length))
{
next_wc = g_utf8_get_char (next);
next_next = g_utf8_next_char (next);
}
else
{
next_wc = 0;
next_next = NULL;
}
if (next_next != NULL && next_next < (text + length))
next_next_wc = g_utf8_get_char (next_next);
else
next_next_wc = 0;
if (prev_wc != 0 && this_wc == 0x0DBB &&
next_wc == 0x0DCA && next_next_wc == 0x200D)
{
/* Determine whether or not this forms a Rephaya syllable.
* SINHALA LETTER + U+0DBB U+0DCA U+200D + SINHALA LETTER is
* the kind of Rephaya.
*/
makes_rephaya_syllable = TRUE;
attrs[i].is_cursor_position = FALSE;
attrs[i].is_char_break = FALSE;
attrs[i].is_line_break = FALSE;
attrs[i].is_mandatory_break = FALSE;
}
else if (prev_wc == 0x200D &&
(makes_rephaya_syllable || this_wc == 0x0DBB || this_wc == 0x0DBA))
{
/* fixes the cursor break in Sinhala.
* SINHALA LETTER + SINHALA VOWEL + ZWJ + 0x0DBB/0x0DBA is
* the kind of Rakaransaya/Yansaya. these characters has to
* be dealt as one character.
*/
attrs[i].is_cursor_position = FALSE;
attrs[i].is_char_break = FALSE;
attrs[i].is_line_break = FALSE;
attrs[i].is_mandatory_break = FALSE;
makes_rephaya_syllable = FALSE;
}
else if (this_wc == 0x200D &&
((makes_rephaya_syllable && next_wc != 0) ||
(next_wc == 0x0DBB || next_wc == 0x0DBA)))
{
attrs[i].is_cursor_position = FALSE;
attrs[i].is_char_break = FALSE;
attrs[i].is_line_break = FALSE;
attrs[i].is_mandatory_break = FALSE;
}
}
}
static void
indic_engine_lang_class_init (PangoEngineLangClass *klass)
{
klass->script_break = indic_engine_break;
}
PANGO_ENGINE_LANG_DEFINE_TYPE (IndicEngineLang, indic_engine_lang,
indic_engine_lang_class_init, NULL)
void
PANGO_MODULE_ENTRY(init) (GTypeModule *module)
{
indic_engine_lang_register_type (module);
}
void
PANGO_MODULE_ENTRY(exit) (void)
{
}
void
PANGO_MODULE_ENTRY(list) (PangoEngineInfo **engines,
int *n_engines)
{
*engines = script_engines;
*n_engines = G_N_ELEMENTS (script_engines);
}
PangoEngine *
PANGO_MODULE_ENTRY(create) (const char *id)
{
guint i;
for (i = 0; i < G_N_ELEMENTS(script_engines); i++)
{
if (!strcmp (id, script_engines[i].id))
return g_object_new (indic_engine_lang_type, NULL);
}
return NULL;
}
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