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/* Pango
* break-indic.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 "pango-break.h"
#define DEV_RRA 0x0931 /* 0930 + 093c */
#define DEV_QA 0x0958 /* 0915 + 093c */
#define DEV_YA 0x095F /* 092f + 003c */
#define DEV_KHHA 0x0959
#define DEV_GHHA 0x095A
#define DEV_ZA 0x095B
#define DEV_DDDHA 0x095C
#define DEV_RHA 0x095D
#define DEV_FA 0x095E
#define DEV_YYA 0x095F
/* Bengali */
/* for split matras in all brahmi based script */
#define BENGALI_SIGN_O 0x09CB /* 09c7 + 09be */
#define BENGALI_SIGN_AU 0x09CC /* 09c7 + 09d7 */
#define BENGALI_RRA 0x09DC
#define BENGALI_RHA 0x09DD
#define BENGALI_YYA 0x09DF
/* Gurumukhi */
#define GURUMUKHI_LLA 0x0A33
#define GURUMUKHI_SHA 0x0A36
#define GURUMUKHI_KHHA 0x0A59
#define GURUMUKHI_GHHA 0x0A5A
#define GURUMUKHI_ZA 0x0A5B
#define GURUMUKHI_RRA 0x0A5C
#define GURUMUKHI_FA 0x0A5E
/* Oriya */
#define ORIYA_AI 0x0B48
#define ORIYA_O 0x0B4B
#define ORIYA_AU 0x0B4C
/* Telugu */
#define TELUGU_EE 0x0C47
#define TELUGU_AI 0x0C48
/* Tamil */
#define TAMIL_O 0x0BCA
#define TAMIL_OO 0x0BCB
#define TAMIL_AU 0x0BCC
/* Kannada */
#define KNDA_EE 0x0CC7
#define KNDA_AI 0x0CC8
#define KNDA_O 0x0CCA
#define KNDA_OO 0x0CCB
/* Malayalam */
#define MLYM_O 0x0D4A
#define MLYM_OO 0x0D4B
#define MLYM_AU 0x0D4C
#define IS_COMPOSITE_WITH_BRAHMI_NUKTA(c) ( \
(c >= BENGALI_RRA && c <= BENGALI_YYA) || \
(c >= DEV_QA && c <= DEV_YA) || (c == DEV_RRA) || (c >= DEV_KHHA && c <= DEV_YYA) || \
(c >= KNDA_EE && c <= KNDA_AI) ||(c >= KNDA_O && c <= KNDA_OO) || \
(c == TAMIL_O) || (c == TAMIL_OO) || (c == TAMIL_AU) || \
(c == TELUGU_EE) || (c == TELUGU_AI) || \
(c == ORIYA_AI) || (c == ORIYA_O) || (c == ORIYA_AU) || \
(c >= GURUMUKHI_KHHA && c <= GURUMUKHI_RRA) || (c == GURUMUKHI_FA)|| (c == GURUMUKHI_LLA)|| (c == GURUMUKHI_SHA) || \
FALSE)
#define IS_SPLIT_MATRA_BRAHMI(c) ( \
(c == BENGALI_SIGN_O) || (c == BENGALI_SIGN_AU) || \
(c >= MLYM_O && c <= MLYM_AU) || \
FALSE)
static void
not_cursor_position (PangoLogAttr *attr)
{
if (!attr->is_mandatory_break)
{
attr->is_cursor_position = FALSE;
attr->is_char_break = FALSE;
attr->is_line_break = FALSE;
attr->is_mandatory_break = FALSE;
}
}
static void
break_indic (const char *text,
int length,
const PangoAnalysis *analysis,
PangoLogAttr *attrs,
int attrs_len G_GNUC_UNUSED)
{
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 (G_UNLIKELY (
IS_COMPOSITE_WITH_BRAHMI_NUKTA(this_wc) || IS_SPLIT_MATRA_BRAHMI(this_wc))) {
attrs[i+1].backspace_deletes_character = FALSE;
}
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;
}
}
}
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