sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #ifndef __THAISHAPING_H
sl@0: #define __THAISHAPING_H
sl@0: 
sl@0: /**
sl@0:  * \file
sl@0:  * \internal
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LEGlyphFilter.h"
sl@0: #include "OpenTypeTables.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: class LEGlyphStorage;
sl@0: 
sl@0: class ThaiShaping /* not : public UObject because all methods are static */ {
sl@0: public:
sl@0: 
sl@0:     enum {
sl@0:         // Character classes
sl@0:         NON =  0,
sl@0:         CON =  1,
sl@0:         COA =  2,
sl@0:         COD =  3,
sl@0:         LVO =  4,
sl@0:         FV1 =  5,
sl@0:         FV2 =  6,
sl@0:         FV3 =  7,
sl@0:         BV1 =  8,
sl@0:         BV2 =  9,
sl@0:         BDI = 10,
sl@0:         TON = 11,
sl@0:         AD1 = 12,
sl@0:         AD2 = 13,
sl@0:         AD3 = 14,
sl@0:         NIK = 15,
sl@0:         AV1 = 16,
sl@0:         AV2 = 17,
sl@0:         AV3 = 18,
sl@0:         classCount = 19,
sl@0: 
sl@0:         // State Transition actions
sl@0:         tA  =  0,
sl@0:         tC  =  1,
sl@0:         tD  =  2,
sl@0:         tE  =  3,
sl@0:         tF  =  4,
sl@0:         tG  =  5,
sl@0:         tH  =  6,
sl@0:         tR  =  7,
sl@0:         tS  =  8
sl@0:     };
sl@0: 
sl@0:     struct StateTransition
sl@0:     {
sl@0:         le_uint8 nextState;
sl@0:         le_uint8 action;
sl@0: 
sl@0:         le_uint8 getNextState() { return nextState; };
sl@0:         le_uint8 getAction() { return action; };
sl@0:     };
sl@0: 
sl@0:     static le_int32 compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,
sl@0:         LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage);
sl@0: 
sl@0: private:
sl@0:     // forbid instantiation
sl@0:     ThaiShaping();
sl@0: 
sl@0:     static const le_uint8 classTable[];
sl@0:     static const StateTransition thaiStateTable[][classCount];
sl@0: 
sl@0:     inline static StateTransition getTransition(le_uint8 state, le_uint8 currClass);
sl@0: 
sl@0:     static le_uint8 doTransition(StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,
sl@0:         LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);
sl@0: 
sl@0:     static le_uint8 getNextState(LEUnicode ch, le_uint8 state, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,
sl@0:         le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);
sl@0: 
sl@0:     static le_bool isLegalHere(LEUnicode ch, le_uint8 prevState);
sl@0:     static le_uint8 getCharClass(LEUnicode ch);
sl@0: 
sl@0:     static LEUnicode noDescenderCOD(LEUnicode cod, le_uint8 glyphSet);
sl@0:     static LEUnicode leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet);
sl@0:     static LEUnicode lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet);
sl@0:     static LEUnicode lowerRightTone(LEUnicode tone, le_uint8 glyphSet);
sl@0:     static LEUnicode lowerLeftTone(LEUnicode tone, le_uint8 glyphSet);
sl@0:     static LEUnicode upperLeftTone(LEUnicode tone, le_uint8 glyphSet);
sl@0: 
sl@0: };
sl@0: 
sl@0: inline ThaiShaping::StateTransition ThaiShaping::getTransition(le_uint8 state, le_uint8 currClass)
sl@0: {
sl@0:     return thaiStateTable[state][currClass];
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END
sl@0: #endif
sl@0: 
sl@0: