123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/*
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* @(#)ThaiShaping.h 1.9 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#ifndef __THAISHAPING_H
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#define __THAISHAPING_H
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#include "LETypes.h"
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#include "LEGlyphFilter.h"
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#include "OpenTypeTables.h"
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U_NAMESPACE_BEGIN
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class ThaiMarkFilter : public UMemory, public LEGlyphFilter
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{
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private:
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struct MarkRange
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{
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LEUnicode first;
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LEUnicode last;
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};
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MarkRange *rangeList;
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ThaiMarkFilter(const ThaiMarkFilter &other); // forbid copying of this class
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ThaiMarkFilter &operator=(const ThaiMarkFilter &other); // forbid copying of this class
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public:
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ThaiMarkFilter(le_uint8 glyphSet);
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~ThaiMarkFilter();
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virtual le_bool filter(LEGlyphID glyph);
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};
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class ThaiShaping /* not : public UObject because all methods are static */ {
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public:
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enum {
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// Character classes
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NON = 0,
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CON = 1,
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COA = 2,
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COD = 3,
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LVO = 4,
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FV1 = 5,
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FV2 = 6,
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FV3 = 7,
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BV1 = 8,
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BV2 = 9,
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BDI = 10,
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TON = 11,
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AD1 = 12,
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AD2 = 13,
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AD3 = 14,
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NIK = 15,
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AV1 = 16,
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AV2 = 17,
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AV3 = 18,
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classCount = 19,
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// State Transition actions
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_A = 0,
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_C = 1,
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_D = 2,
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_E = 3,
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_F = 4,
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_G = 5,
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_H = 6,
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_R = 7,
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_S = 8
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};
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struct StateTransition
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{
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le_uint8 nextState;
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le_uint8 action;
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le_uint8 getNextState() { return nextState; };
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le_uint8 getAction() { return action; };
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};
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static le_int32 compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,
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LEUnicode errorChar, LEUnicode *output, le_int32 *charIndicies);
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private:
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// forbid instantiation
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ThaiShaping();
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static const le_uint8 classTable[];
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static const StateTransition thaiStateTable[][classCount];
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static StateTransition getTransition(le_uint8 state, le_uint8 currClass);
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static le_uint8 doTransition(StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,
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LEUnicode errorChar, LEUnicode *outputBuffer, le_int32 *charIndicies, le_int32 &outputIndex);
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static le_uint8 getNextState(LEUnicode ch, le_uint8 state, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,
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le_uint8 &charClass, LEUnicode *output, le_int32 *charIndicies, le_int32 &outputIndex);
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static le_bool isLegalHere(LEUnicode ch, le_uint8 prevState);
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static le_uint8 getCharClass(LEUnicode ch);
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static LEUnicode noDescenderCOD(LEUnicode cod, le_uint8 glyphSet);
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static LEUnicode leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet);
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static LEUnicode lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet);
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static LEUnicode lowerRightTone(LEUnicode tone, le_uint8 glyphSet);
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static LEUnicode lowerLeftTone(LEUnicode tone, le_uint8 glyphSet);
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static LEUnicode upperLeftTone(LEUnicode tone, le_uint8 glyphSet);
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};
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inline ThaiShaping::StateTransition ThaiShaping::getTransition(le_uint8 state, le_uint8 currClass)
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{
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return thaiStateTable[state][currClass];
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}
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U_NAMESPACE_END
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#endif
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