/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_i18npool.hxx"
#include <breakiterator_th.hxx>
#include <wtt.h>

#include <string.h>	// for memset

using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
using namespace ::rtl;

namespace com { namespace sun { namespace star { namespace i18n {

//	----------------------------------------------------
//	class Breakiterator_th
//	----------------------------------------------------;
BreakIterator_th::BreakIterator_th()
{
	cBreakIterator = "com.sun.star.i18n.BreakIterator_th";
    wordRule=lineRule=NULL;
}

BreakIterator_th::~BreakIterator_th()
{
}

#define SARA_AM 0x0E33

/*
 * cell composition states
 */

#define ST_COM	1	// Compose the following character with leading char and display in the same cell
#define ST_NXT	2	// display the following character in the next cell
#define ST_NDP	3	// non-display

static const sal_Int16 thaiCompRel[MAX_CT][MAX_CT] = {
	//  C  N  C  L  F  F  F  B  B  B  T  A  A  A  A  A  A
	//  T  O  O  V  V  V  V  V  V  D  O  D  D  D  V  V  V
	//  R  N  N     1  2  3  1  2     N  1  2  3  1  2  3
	//  L     S                       E
	//  0  1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // CTRL 0
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // NON  1
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM   }, // CONS 2
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // LV   3
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // FV1  4
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // FV2  5
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // FV3  6
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // BV1  7
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // BV2  8
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // BD   9
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // TONE 10
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AD1  11
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AD2  12
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AD3  13
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AV1  14
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AV2  15
	{   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_NXT, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT   } // AV3  16

};

const sal_uInt32 is_ST_COM = (1<<CT_CTRL)|(1<<CT_NON)|(1<<CT_CONS)|(1<<CT_TONE);

static sal_uInt16 SAL_CALL getCombState(const sal_Unicode *text, sal_Int32 pos)
{
	sal_uInt16 ch1 = getCharType(text[pos]);
	sal_uInt16 ch2 = getCharType(text[pos+1]);

	if (text[pos+1] == SARA_AM) {
	    if ((1 << ch1) & is_ST_COM)
		return  ST_COM;
	    else
		ch2 = CT_AD1;
	}

	return thaiCompRel[ch1][ch2];
}


static sal_Int32 SAL_CALL getACell(const sal_Unicode *text, sal_Int32 pos, sal_Int32 len)
{
	sal_uInt32 curr = 1;
	for (; pos + 1 < len && getCombState(text, pos) == ST_COM; curr++, pos++) {}
	return curr;
}

#define is_Thai(c)	(0x0e00 <= c && c <= 0x0e7f) // Unicode definition for Thai

void SAL_CALL BreakIterator_th::makeIndex(const OUString& Text, sal_Int32 nStartPos)
	throw(RuntimeException)
{
	if (Text != cachedText) {
	    cachedText = Text;
	    if (cellIndexSize < cachedText.getLength()) {
		cellIndexSize = cachedText.getLength();
		free(nextCellIndex);
		free(previousCellIndex);
		nextCellIndex = (sal_Int32*) calloc(cellIndexSize, sizeof(sal_Int32));
		previousCellIndex = (sal_Int32*) calloc(cellIndexSize, sizeof(sal_Int32));
	    }
	    // reset nextCell for new Text
	    memset(nextCellIndex, 0, cellIndexSize * sizeof(sal_Int32));
	}
	else if (nextCellIndex[nStartPos] > 0 || ! is_Thai(Text[nStartPos]))
	    return;

	const sal_Unicode* str = cachedText.getStr();
	sal_Int32 len = cachedText.getLength(), startPos, endPos;

	startPos = nStartPos;
	while (startPos > 0 && is_Thai(str[startPos-1])) startPos--;
	endPos = nStartPos+1;
	while (endPos < len && is_Thai(str[endPos])) endPos++;

	sal_Int32 start, end, pos;
	pos = start = end = startPos;

	while (pos < endPos) {
	    end += getACell(str, start, endPos);
	    while (pos < end) {
		nextCellIndex[pos] = end;
		previousCellIndex[pos] = start;
		pos++;
	    }
	    start = end;
	}
}

} } } }