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

   1 /*\r
   2  *******************************************************************************\r
   3  * Copyright (C) 1998-2007, International Business Machines Corporation and    *\r
   4  * others. All Rights Reserved.                                                *\r
   5  *******************************************************************************\r
   6  *\r
   7  * Created on Dec 3, 2003\r
   8  *\r
   9  *******************************************************************************\r
  10  */\r
  11 package com.ibm.icu.dev.tool.layout;\r
  12 \r
  13 import java.util.Vector;\r
  14 \r
  15 import com.ibm.icu.impl.Utility;\r
  16 \r
  17 public class LigatureTreeWalker extends TreeWalker implements LookupSubtable\r
  18 {\r
  19     protected int[] componentChars;\r
  20     protected int componentCount;\r
  21     protected int lastFirstComponent;\r
  22 \r
  23     protected Vector ligatureSets;\r
  24     protected Vector ligatureSet;\r
  25     \r
  26     public LigatureTreeWalker()\r
  27     {\r
  28         componentChars = new int[30];\r
  29         componentCount = 0;\r
  30         lastFirstComponent = -1;\r
  31         ligatureSet = null;\r
  32         ligatureSets = new Vector();\r
  33     }\r
  34 \r
  35     public void down(int ch)\r
  36     {\r
  37         componentChars[componentCount] = ch;\r
  38         componentCount += 1;\r
  39     }\r
  40 \r
  41     public void up()\r
  42     {\r
  43         if (componentCount > 0) {\r
  44             componentCount -= 1;\r
  45         }\r
  46     }\r
  47 \r
  48     public void ligature(int lig)\r
  49     {\r
  50         int firstComponent = componentChars[0];\r
  51 \r
  52         if (lastFirstComponent != firstComponent) {\r
  53             if (ligatureSet != null) {\r
  54                 ligatureSets.addElement(ligatureSet);\r
  55             }\r
  56 \r
  57             ligatureSet = new Vector();\r
  58             lastFirstComponent = firstComponent;\r
  59         }\r
  60 \r
  61         ligatureSet.addElement(new LigatureEntry(lig, componentChars, componentCount));\r
  62     }\r
  63 \r
  64     public void done()\r
  65     {\r
  66         if (ligatureSet != null) {\r
  67             ligatureSets.addElement(ligatureSet);\r
  68         }\r
  69     }\r
  70     protected int firstComponentChar(int ligatureSetIndex)\r
  71     {\r
  72         Vector aLigatureSet = (Vector) ligatureSets.elementAt(ligatureSetIndex);\r
  73         LigatureEntry firstEntry = (LigatureEntry) aLigatureSet.elementAt(0);\r
  74 \r
  75         return firstEntry.getComponentChar(0);\r
  76     }\r
  77 \r
  78     protected void writeCoverageTable(OpenTypeTableWriter writer)\r
  79     {\r
  80         int ligatureSetCount = ligatureSets.size();\r
  81 \r
  82         writer.writeData(1);\r
  83         writer.writeData(ligatureSetCount);\r
  84 \r
  85         for (int set = 0; set < ligatureSetCount; set += 1) {\r
  86             writer.writeData(firstComponentChar(set));\r
  87         }\r
  88     }\r
  89     \r
  90     public void writeLookupSubtable(OpenTypeTableWriter writer)\r
  91     {\r
  92         int coverageOffset, ligatureSetOffset, ligatureTableOffset;\r
  93         int ligatureSubstitutionBase = writer.getOutputIndex();\r
  94         int ligatureSetCount = ligatureSets.size();\r
  95         \r
  96         //System.out.println("Writing " + tableName + "...");\r
  97 \r
  98         writer.writeData(1);   // substFormat\r
  99         \r
 100         coverageOffset = writer.getOutputIndex();\r
 101         writer.writeData(0);   // coverageTableOffset (will fix later)\r
 102         \r
 103         writer.writeData(ligatureSetCount);\r
 104 \r
 105         ligatureSetOffset = writer.getOutputIndex();\r
 106         for (int set = 0; set < ligatureSetCount; set += 1) {\r
 107             writer.writeData(0);  // ligatureSet offset - will fix later\r
 108         }\r
 109         \r
 110         for (int set = 0; set < ligatureSetCount; set += 1) {\r
 111             System.out.print(Utility.hex(firstComponentChar(set), 6) + ": ");\r
 112             \r
 113             Vector aLigatureSet = (Vector) ligatureSets.elementAt(set);\r
 114             int ligatureCount = aLigatureSet.size();\r
 115             int ligatureSetAddress = writer.getOutputIndex();\r
 116             \r
 117             System.out.println(ligatureCount + " ligatures.");\r
 118             \r
 119             writer.fixOffset(ligatureSetOffset++, ligatureSubstitutionBase);\r
 120             writer.writeData(ligatureCount);\r
 121             \r
 122             ligatureTableOffset = writer.getOutputIndex();\r
 123             for (int lig = 0; lig < ligatureCount; lig += 1) {\r
 124                 writer.writeData(0);  // ligatureTableOffset (will fix later)\r
 125             }\r
 126             \r
 127             for (int lig = 0; lig < ligatureCount; lig += 1) {\r
 128                 LigatureEntry entry = (LigatureEntry) aLigatureSet.elementAt(lig);\r
 129                 int compCount = entry.getComponentCount();\r
 130                 \r
 131                 writer.fixOffset(ligatureTableOffset++, ligatureSetAddress);\r
 132                 writer.writeData(entry.getLigature());\r
 133                 writer.writeData(compCount);\r
 134                 \r
 135                 for (int comp = 1; comp < compCount; comp += 1) {\r
 136                     writer.writeData(entry.getComponentChar(comp));\r
 137                 }\r
 138             }\r
 139         }\r
 140         \r
 141         writer.fixOffset(coverageOffset, ligatureSubstitutionBase); \r
 142         writeCoverageTable(writer);\r
 143     }\r
 144 }\r