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/*
* @(#)ThaiShaping.h 1.9 00/03/15
*
* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
*
*/
#ifndef __THAISHAPING_H
#define __THAISHAPING_H
#include "LETypes.h"
#include "LEGlyphFilter.h"
#include "OpenTypeTables.h"
U_NAMESPACE_BEGIN
class ThaiMarkFilter : public LEGlyphFilter
{
private:
struct MarkRange
{
LEUnicode first;
LEUnicode last;
};
MarkRange *rangeList;
public:
ThaiMarkFilter(le_uint8 glyphSet);
~ThaiMarkFilter();
virtual le_bool filter(LEGlyphID glyph);
};
class ThaiShaping
{
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
_A = 0,
_C = 1,
_D = 2,
_E = 3,
_F = 4,
_G = 5,
_H = 6,
_R = 7,
_S = 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, le_int32 *charIndicies);
private:
static const le_uint8 classTable[];
static const StateTransition thaiStateTable[][classCount];
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, le_int32 *charIndicies, 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, le_int32 *charIndicies, 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
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