jars/icu4j-4_4_2-src/tools/misc/src/com/ibm/icu/dev/tool/layout/ThaiStateTable.java

   1 /*\r
   2  *******************************************************************************\r
   3  * Copyright (C) 1998-2008, International Business Machines Corporation and    *\r
   4  * others. All Rights Reserved.                                                *\r
   5  *******************************************************************************\r
   6  *\r
   7  * Created on Dec 09, 2003\r
   8  *\r
   9  *******************************************************************************\r
  10  */\r
  11 package com.ibm.icu.dev.tool.layout;\r
  12 \r
  13 import java.io.PrintStream;\r
  14 import java.util.Vector;\r
  15 \r
  16 public class ThaiStateTable\r
  17 {\r
  18     static Vector stateTable = null;\r
  19     static int nextState = 0;\r
  20     \r
  21     private final static int newState()\r
  22     {\r
  23         ThaiStateTransition[] stateRow = new ThaiStateTransition[ThaiCharacterClasses.cCount];\r
  24         \r
  25         for (int c = 0; c < ThaiCharacterClasses.cCount; c += 1) {\r
  26             stateRow[c] = null;\r
  27         }\r
  28         \r
  29         stateTable.addElement(stateRow);\r
  30         \r
  31         return nextState++;\r
  32     }\r
  33     \r
  34     private final static boolean isLegalHere(int state, char pairAction)\r
  35     {\r
  36         switch (pairAction) {\r
  37         case 'A':\r
  38             return state == 0;\r
  39             \r
  40         case 'C':\r
  41         case 'D':\r
  42         case 'E':\r
  43         case 'F':\r
  44         case 'G':\r
  45         case 'H':\r
  46             return true;\r
  47         \r
  48         case 'R':\r
  49         case 'S':\r
  50             return false;\r
  51         }\r
  52         \r
  53         return false;\r
  54     }\r
  55     \r
  56     private final static boolean composesWithAnything(int charClass)\r
  57     {\r
  58         for (int c = 0; c < ThaiCharacterClasses.cCount; c += 1) {\r
  59             char action = ThaiCharacterClasses.getPairAction(charClass, c);\r
  60             \r
  61             if (action >= 'C' && action <= 'I') {\r
  62                 return true;\r
  63             }\r
  64         }\r
  65         \r
  66         return false;\r
  67     }\r
  68     \r
  69     private final static void fixNextStates()\r
  70     {\r
  71         ThaiStateTransition[] groundState = (ThaiStateTransition[]) stateTable.elementAt(0);\r
  72         \r
  73         for (int s = 1; s < stateTable.size(); s += 1) {\r
  74             ThaiStateTransition[] state = (ThaiStateTransition[]) stateTable.elementAt(s);\r
  75             \r
  76             for (int c = 0; c < ThaiCharacterClasses.cCount; c += 1) {\r
  77                 ThaiStateTransition transition = state[c];\r
  78                 \r
  79                 if (transition.getNextState() == 0) {\r
  80                     transition.setNextState(groundState[c].getNextState());\r
  81                 }\r
  82             }\r
  83         }\r
  84     }\r
  85     \r
  86     private final static int addState(int prevClass, int prevPrevClass)\r
  87     {\r
  88         int state = newState();\r
  89         ThaiStateTransition[] stateRow = (ThaiStateTransition[]) stateTable.elementAt(state);\r
  90         \r
  91         for (int c = 0; c < ThaiCharacterClasses.cCount; c += 1) {\r
  92             char pairAction = ThaiCharacterClasses.getPairAction(prevClass, c);\r
  93             int nextSt = 0;\r
  94             \r
  95             switch (pairAction) {\r
  96             case 'G':\r
  97                 if (prevClass == ThaiCharacterClasses.NIK &&\r
  98                     prevPrevClass == ThaiCharacterClasses.AV1) {\r
  99                     pairAction = 'R';\r
 100                 } else if (prevPrevClass != ThaiCharacterClasses.COA) {\r
 101                     pairAction = 'C';\r
 102                 }\r
 103                 break;\r
 104                 \r
 105             case 'E':\r
 106                 if (prevPrevClass == ThaiCharacterClasses.COA) {\r
 107                     pairAction = 'F';\r
 108                 }\r
 109                 break;\r
 110                 \r
 111             case 'I':\r
 112                 if (prevClass == ThaiCharacterClasses.TON &&\r
 113                     (prevPrevClass < ThaiCharacterClasses.CON ||\r
 114                      prevPrevClass > ThaiCharacterClasses.COD)) {\r
 115                     pairAction = 'S';\r
 116                 } else {\r
 117                     pairAction = 'A';\r
 118                 }\r
 119                 break;\r
 120                 \r
 121             default:\r
 122                 break;\r
 123             }\r
 124             \r
 125             if (c != prevClass && isLegalHere(state, pairAction) && composesWithAnything(c)) {\r
 126                 nextSt = addState(c, prevClass);\r
 127             }\r
 128             \r
 129             stateRow[c] = new ThaiStateTransition(nextSt, pairAction);\r
 130         }\r
 131         \r
 132         return state;\r
 133     }\r
 134     \r
 135     static\r
 136     {\r
 137         stateTable = new Vector();\r
 138             \r
 139         addState(ThaiCharacterClasses.NON, ThaiCharacterClasses.NON);\r
 140             \r
 141         fixNextStates();\r
 142     }\r
 143     \r
 144     public static ThaiStateTransition getTransition(int state, int currClass)\r
 145     {\r
 146         ThaiStateTransition[] row = (ThaiStateTransition[]) stateTable.elementAt(state);\r
 147         \r
 148         return row[currClass];\r
 149     }\r
 150 \r
 151     private static String header0 =\r
 152 "const ThaiShaping::StateTransition ThaiShaping::thaiStateTable[][ThaiShaping::classCount] = {";\r
 153 \r
 154     private static String header1 =\r
 155 "    //+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+";\r
 156 \r
 157     private static String header2 =\r
 158 "    //|         N         C         C         C         L         F         F         F         B         B         B         T         A         A         A         N         A         A         A    |\n" +\r
 159 "    //|         O         O         O         O         V         V         V         V         V         V         D         O         D         D         D         I         V         V         V    |\n" +\r
 160 "    //|         N         N         A         D         O         1         2         3         1         2         I         N         1         2         3         K         1         2         3    |";\r
 161     \r
 162     public static void writeStateTable(PrintStream output)\r
 163     {\r
 164         System.out.print("Writing state table...");\r
 165         \r
 166         output.println(header0);\r
 167         output.println(header1);\r
 168         output.println(header2);\r
 169         output.println(header1);\r
 170         \r
 171         for (int state = 0; state < stateTable.size(); state += 1) {\r
 172             ThaiStateTransition[] row = (ThaiStateTransition[]) stateTable.elementAt(state);\r
 173             \r
 174             output.print("    /*");\r
 175             \r
 176             if (state < 10) {\r
 177                 output.print("0");\r
 178             }\r
 179             \r
 180             output.print(state);\r
 181             \r
 182             output.print("*/ {");\r
 183             \r
 184             for (int c = 0; c < ThaiCharacterClasses.cCount; c += 1) {\r
 185                 row[c].write(output);\r
 186                 \r
 187                 if (c < ThaiCharacterClasses.cCount - 1) {\r
 188                     output.print(", ");\r
 189                 }\r
 190             }\r
 191             \r
 192             output.print("}");\r
 193                     \r
 194             if (state < stateTable.size() - 1) {\r
 195                 output.print(",");\r
 196             }\r
 197                     \r
 198             output.println();\r
 199         }\r
 200         \r
 201         output.println("};\n");\r
 202         \r
 203         System.out.println(" done.");\r
 204     }\r
 205 }\r