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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 beng_scripts[] = {
{ PANGO_SCRIPT_BENGALI, "*" }
};
static PangoEngineScriptInfo guru_scripts[] = {
{ PANGO_SCRIPT_GURMUKHI, "*" }
};
static PangoEngineScriptInfo gujr_scripts[] = {
{ PANGO_SCRIPT_GUJARATI, "*" }
};
static PangoEngineScriptInfo orya_scripts[] = {
{ PANGO_SCRIPT_ORIYA, "*" }
};
static PangoEngineScriptInfo taml_scripts[] = {
{ PANGO_SCRIPT_TAMIL, "*" }
};
static PangoEngineScriptInfo telu_scripts[] = {
{ PANGO_SCRIPT_TELUGU, "*" }
};
static PangoEngineScriptInfo knda_scripts[] = {
{ PANGO_SCRIPT_KANNADA, "*" }
};
static PangoEngineScriptInfo mlym_scripts[] = {
{ PANGO_SCRIPT_MALAYALAM, "*" }
};
static PangoEngineScriptInfo sinh_scripts[] = {
{ PANGO_SCRIPT_SINHALA, "*" }
};
static PangoEngineInfo script_engines[] = {
INDIC_ENGINE_INFO(deva), INDIC_ENGINE_INFO(beng), INDIC_ENGINE_INFO(guru),
INDIC_ENGINE_INFO(gujr), INDIC_ENGINE_INFO(orya), INDIC_ENGINE_INFO(taml),
INDIC_ENGINE_INFO(telu), INDIC_ENGINE_INFO(knda), INDIC_ENGINE_INFO(mlym),
INDIC_ENGINE_INFO(sinh)
};
static void
not_cursor_position (PangoLogAttr *attr)
{
attr->is_cursor_position = FALSE;
attr->is_char_break = FALSE;
attr->is_line_break = FALSE;
attr->is_mandatory_break = FALSE;
}
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 is_conjunct = 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;
switch (analysis->script)
{
case PANGO_SCRIPT_SINHALA:
/*
* TODO: The cursor position should be based on the state table.
* This is the wrong place to be doing this.
*/
/*
* The cursor should treat as a single glyph:
* SINHALA CONS + 0x0DCA + 0x200D + SINHALA CONS
* SINHALA CONS + 0x200D + 0x0DCA + SINHALA CONS
*/
if ((this_wc == 0x0DCA && next_wc == 0x200D)
|| (this_wc == 0x200D && next_wc == 0x0DCA))
{
not_cursor_position(&attrs[i]);
not_cursor_position(&attrs[i + 1]);
is_conjunct = TRUE;
}
else if (is_conjunct
&& (prev_wc == 0x200D || prev_wc == 0x0DCA)
&& this_wc >= 0x0D9A
&& this_wc <= 0x0DC6)
{
not_cursor_position(&attrs[i]);
is_conjunct = FALSE;
}
/*
* Consonant clusters do NOT result in implicit conjuncts
* in SINHALA orthography.
*/
else if (!is_conjunct && prev_wc == 0x0DCA && this_wc != 0x200D)
{
attrs[i].is_cursor_position = TRUE;
}
break;
default:
if (prev_wc != 0 && (this_wc == 0x200D || this_wc == 0x200C))
{
not_cursor_position(&attrs[i]);
if (next_wc != 0)
{
not_cursor_position(&attrs[i+1]);
if ((next_next_wc != 0) &&
(next_wc == 0x09CD || /* Bengali */
next_wc == 0x0ACD || /* Gujarati */
next_wc == 0x094D || /* Hindi */
next_wc == 0x0CCD || /* Kannada */
next_wc == 0x0D4D || /* Malayalam */
next_wc == 0x0B4D || /* Oriya */
next_wc == 0x0A4D || /* Punjabi */
next_wc == 0x0BCD || /* Tamil */
next_wc == 0x0C4D)) /* Telugu */
{
not_cursor_position(&attrs[i+2]);
}
}
}
break;
}
}
}
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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