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Commit	Line	Data
	1	/*
	2	*
	3	* (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
	4	*
	5	*/
	6
	7	#ifndef __THAISHAPING_H
	8	#define __THAISHAPING_H
	9
	10	/**
	11	* \file
	12	* \internal
	13	*/
	14
	15	#include "LETypes.h"
	16	#include "LEGlyphFilter.h"
	17	#include "OpenTypeTables.h"
	18
	19	U_NAMESPACE_BEGIN
	20
	21	class LEGlyphStorage;
	22
	23	class ThaiShaping /* not : public UObject because all methods are static */ {
	24	public:
	25
	26	enum {
	27	// Character classes
	28	NON = 0,
	29	CON = 1,
	30	COA = 2,
	31	COD = 3,
	32	LVO = 4,
	33	FV1 = 5,
	34	FV2 = 6,
	35	FV3 = 7,
	36	BV1 = 8,
	37	BV2 = 9,
	38	BDI = 10,
	39	TON = 11,
	40	AD1 = 12,
	41	AD2 = 13,
	42	AD3 = 14,
	43	NIK = 15,
	44	AV1 = 16,
	45	AV2 = 17,
	46	AV3 = 18,
	47	classCount = 19,
	48
	49	// State Transition actions
	50	tA = 0,
	51	tC = 1,
	52	tD = 2,
	53	tE = 3,
	54	tF = 4,
	55	tG = 5,
	56	tH = 6,
	57	tR = 7,
	58	tS = 8
	59	};
	60
	61	struct StateTransition
	62	{
	63	le_uint8 nextState;
	64	le_uint8 action;
	65
	66	le_uint8 getNextState() { return nextState; };
	67	le_uint8 getAction() { return action; };
	68	};
	69
	70	static le_int32 compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,
	71	LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage);
	72
	73	private:
	74	// forbid instantiation
	75	ThaiShaping();
	76
	77	static const le_uint8 classTable[];
	78	static const StateTransition thaiStateTable[][classCount];
	79
	80	inline static StateTransition getTransition(le_uint8 state, le_uint8 currClass);
	81
	82	static le_uint8 doTransition(StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,
	83	LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);
	84
	85	static le_uint8 getNextState(LEUnicode ch, le_uint8 state, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,
	86	le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex);
	87
	88	static le_bool isLegalHere(LEUnicode ch, le_uint8 prevState);
	89	static le_uint8 getCharClass(LEUnicode ch);
	90
	91	static LEUnicode noDescenderCOD(LEUnicode cod, le_uint8 glyphSet);
	92	static LEUnicode leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet);
	93	static LEUnicode lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet);
	94	static LEUnicode lowerRightTone(LEUnicode tone, le_uint8 glyphSet);
	95	static LEUnicode lowerLeftTone(LEUnicode tone, le_uint8 glyphSet);
	96	static LEUnicode upperLeftTone(LEUnicode tone, le_uint8 glyphSet);
	97
	98	};
	99
	100	inline ThaiShaping::StateTransition ThaiShaping::getTransition(le_uint8 state, le_uint8 currClass)
	101	{
	102	return thaiStateTable[state][currClass];
	103	}
	104
	105	U_NAMESPACE_END
	106	#endif
	107
	108