/*

 *

 * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved

 *

 */

#ifndef __THAISHAPING_H

#define __THAISHAPING_H

/**

 * \file

 * \internal

 */

#include "LETypes.h"

#include "LEGlyphFilter.h"

#include "OpenTypeTables.h"

U_NAMESPACE_BEGIN

class LEGlyphStorage;

class ThaiShaping /* not : public UObject because all methods are static */ {

public:

    enum {

        // Character classes

        NON =  0,

        CON =  1,

        COA =  2,

        COD =  3,

        LVO =  4,

        FV1 =  5,

        FV2 =  6,

        FV3 =  7,

        BV1 =  8,

        BV2 =  9,

        BDI = 10,

        TON = 11,

        AD1 = 12,

        AD2 = 13,

        AD3 = 14,

        NIK = 15,

        AV1 = 16,

        AV2 = 17,

        AV3 = 18,

        classCount = 19,

        // State Transition actions

        tA  =  0,

        tC  =  1,

        tD  =  2,

        tE  =  3,

        tF  =  4,

        tG  =  5,

        tH  =  6,

        tR  =  7,

        tS  =  8

    };

    struct StateTransition

    {

        le_uint8 nextState;

        le_uint8 action;

        le_uint8 getNextState() { return nextState; };

        le_uint8 getAction() { return action; };

    };

    static le_int32 compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,

        LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage);

private:

    // forbid instantiation

    ThaiShaping();

    static const le_uint8 classTable[];

    static const StateTransition thaiStateTable[][classCount];

    inline static StateTransition getTransition(le_uint8 state, le_uint8 currClass);

    static le_uint8 doTransition(StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,

        LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);

    static le_uint8 getNextState(LEUnicode ch, le_uint8 state, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,

        le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);

    static le_bool isLegalHere(LEUnicode ch, le_uint8 prevState);

    static le_uint8 getCharClass(LEUnicode ch);

    static LEUnicode noDescenderCOD(LEUnicode cod, le_uint8 glyphSet);

    static LEUnicode leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet);

    static LEUnicode lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet);

    static LEUnicode lowerRightTone(LEUnicode tone, le_uint8 glyphSet);

    static LEUnicode lowerLeftTone(LEUnicode tone, le_uint8 glyphSet);

    static LEUnicode upperLeftTone(LEUnicode tone, le_uint8 glyphSet);

};

inline ThaiShaping::StateTransition ThaiShaping::getTransition(le_uint8 state, le_uint8 currClass)

{

    return thaiStateTable[state][currClass];

}

U_NAMESPACE_END

#endif