1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 /* 27 * 28 * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved 29 * 30 */ 31 32 #ifndef __THAISHAPING_H 33 #define __THAISHAPING_H 34 35 /** 36 * \file 37 * \internal 38 */ 39 40 #include "LETypes.h" 41 #include "LEGlyphFilter.h" 42 #include "OpenTypeTables.h" 43 44 U_NAMESPACE_BEGIN 45 46 class LEGlyphStorage; 47 48 class ThaiShaping /* not : public UObject because all methods are static */ { 49 public: 50 51 enum { 52 // Character classes 53 NON = 0, 54 CON = 1, 55 COA = 2, 56 COD = 3, 57 LVO = 4, 58 FV1 = 5, 59 FV2 = 6, 60 FV3 = 7, 61 BV1 = 8, 62 BV2 = 9, 63 BDI = 10, 64 TON = 11, 65 AD1 = 12, 66 AD2 = 13, 67 AD3 = 14, 68 NIK = 15, 69 AV1 = 16, 70 AV2 = 17, 71 AV3 = 18, 72 classCount = 19, 73 74 // State Transition actions 75 tA = 0, 76 tC = 1, 77 tD = 2, 78 tE = 3, 79 tF = 4, 80 tG = 5, 81 tH = 6, 82 tR = 7, 83 tS = 8, 84 stateCount = 52 85 }; 86 87 struct StateTransition 88 { 89 le_uint8 nextState; 90 le_uint8 action; 91 92 le_uint8 getNextState() { return nextState; }; 93 le_uint8 getAction() { return action; }; 94 }; 95 96 static le_int32 compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet, 97 LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage); 98 99 private: 100 // forbid instantiation 101 ThaiShaping(); 102 103 static const le_uint8 classTable[]; 104 static const StateTransition thaiStateTable[stateCount][classCount]; 105 106 inline static StateTransition getTransition(le_uint8 state, le_uint8 currClass); 107 108 static le_uint8 doTransition(StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet, 109 LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex); 110 111 static le_uint8 getNextState(LEUnicode ch, le_uint8 state, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar, 112 le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex); 113 114 static le_bool isLegalHere(LEUnicode ch, le_uint8 prevState); 115 static le_uint8 getCharClass(LEUnicode ch); 116 117 static LEUnicode noDescenderCOD(LEUnicode cod, le_uint8 glyphSet); 118 static LEUnicode leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet); 119 static LEUnicode lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet); 120 static LEUnicode lowerRightTone(LEUnicode tone, le_uint8 glyphSet); 121 static LEUnicode lowerLeftTone(LEUnicode tone, le_uint8 glyphSet); 122 static LEUnicode upperLeftTone(LEUnicode tone, le_uint8 glyphSet); 123 124 }; 125 126 inline ThaiShaping::StateTransition ThaiShaping::getTransition(le_uint8 state, le_uint8 currClass) 127 { 128 return thaiStateTable[state][currClass]; 129 } 130 131 U_NAMESPACE_END 132 #endif