1 | package org.greenstone.gsdl3.gs3build.util;
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2 |
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3 | import java.io.*;
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4 | import java.util.*;
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5 |
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6 | import org.greenstone.gsdl3.gs3build.doctypes.DocumentLoader;
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7 |
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8 | public class HTMLEntity
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9 | { String name;
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10 | int code;
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11 | static Vector entities = null;
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12 | static Vector nmapping = null;
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13 |
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14 | public HTMLEntity(String name, int code)
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15 | { int start, end, at;
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16 | HTMLEntity compareEntity;
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17 |
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18 | if (HTMLEntity.entities == null)
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19 | { HTMLEntity.entities = new Vector();
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20 | }
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21 | if (HTMLEntity.nmapping == null)
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22 | { HTMLEntity.nmapping = new Vector();
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23 | }
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24 |
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25 | this.name = name;
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26 | this.code = code;
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27 |
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28 | entities.addElement(this);
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29 | start = 0;
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30 | end = nmapping.size();
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31 | while (start != end)
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32 | { at = (start + end) / 2;
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33 |
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34 | compareEntity =
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35 | (HTMLEntity) entities.elementAt(((Integer) nmapping.elementAt(at)).intValue());
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36 | if (compareEntity.code > code)
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37 | { end = at;
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38 | }
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39 | else
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40 | { start = at + 1;
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41 | }
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42 | }
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43 | if (end == nmapping.size())
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44 | { nmapping.addElement(new Integer(nmapping.size()));
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45 | }
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46 | else
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47 | { nmapping.insertElementAt(new Integer(nmapping.size()), start);
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48 | }
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49 | }
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50 |
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51 | public String toString()
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52 | { Character c;
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53 |
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54 | c = new Character((char) this.code);
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55 | return c.toString();
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56 | }
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57 |
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58 | public static String codeString(char c)
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59 | { StringBuffer reply;
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60 | String codestring;
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61 |
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62 | if (c < 128 || c == '&' || c == '<' || c == '>')
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63 | { return null;
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64 | }
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65 | codestring = Integer.toString((int) c);
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66 | reply = new StringBuffer("&#");
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67 | reply.append(codestring);
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68 | reply.append(";");
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69 |
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70 | return reply.toString();
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71 | }
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72 |
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73 | public static String nameCodeString(char c)
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74 | { int start, end, at, compare;
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75 | HTMLEntity compareEntity;
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76 |
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77 | start = 0;
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78 | end = nmapping.size();
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79 | while (start != end)
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80 | { at = (start + end) / 2;
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81 |
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82 | compareEntity =
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83 | (HTMLEntity) entities.elementAt(((Integer) nmapping.elementAt(at)).intValue());
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84 | if (compareEntity.code == (int) c)
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85 | { StringBuffer reply;
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86 |
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87 | reply = new StringBuffer("&");
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88 | reply.append(compareEntity.name);
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89 | reply.append(";");
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90 | return reply.toString();
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91 | }
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92 | else if (compareEntity.code < c)
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93 | { end = at;
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94 | }
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95 | else
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96 | { start = at + 1;
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97 | }
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98 | }
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99 | return codeString(c);
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100 | }
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101 |
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102 | public static void getEntities(String source)
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103 | { HTMLEntity newentity;
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104 | int pos;
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105 | int start;
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106 | String name;
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107 | int code;
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108 |
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109 | if (source == null)
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110 | { return;
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111 | }
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112 |
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113 | start = 0;
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114 | while (start < source.length())
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115 | { pos = start;
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116 | while (source.charAt(pos) != ':')
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117 | { pos ++;
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118 | }
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119 | name = source.substring(start, pos);
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120 |
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121 | // skip colon and reset
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122 | pos ++;
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123 | start = pos;
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124 |
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125 | while(pos < source.length() && source.charAt(pos) > ' ')
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126 | { pos ++;
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127 | }
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128 | code = Integer.parseInt(source.substring(start, pos));
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129 |
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130 | newentity = new HTMLEntity(name, code);
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131 |
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132 | while ( pos < source.length() && source.charAt(pos) < ' ')
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133 | { pos ++;
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134 | }
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135 | start = pos;
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136 | }
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137 | }
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138 |
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139 | public static void getEntities(InputStream in)
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140 | { getEntities(DocumentLoader.getAsString(in));
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141 | }
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142 |
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143 | public static void getEntities(File file)
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144 | { FileInputStream in;
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145 |
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146 | try
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147 | { in = new FileInputStream(file);
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148 | getEntities(in);
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149 | in.close();
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150 | }
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151 | catch (IOException io)
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152 | { System.out.println("No entities");
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153 | }
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154 | }
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155 |
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156 | public static void getEntities()
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157 | { ClassLoader loader;
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158 | InputStream in;
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159 |
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160 | in = ClassLoader.getSystemResourceAsStream("org\\greenstone\\gsdl3\\gs3build\\util\\Entities.map");
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161 | if (in == null)
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162 | { System.out.println("Unable to load Entities.map from org.greenstone.gsdl3.gs3build.util");
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163 | }
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164 | getEntities(in);
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165 | }
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166 |
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167 | public static String encodeText(String source, boolean named)
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168 | { StringBuffer reply;
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169 | int start,at;
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170 |
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171 | if (source == null)
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172 | { return null;
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173 | }
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174 |
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175 | if (HTMLEntity.entities == null)
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176 | { getEntities();
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177 | }
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178 |
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179 | reply = new StringBuffer();
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180 | at = 0;
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181 | start = 0;
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182 | while (at < source.length())
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183 | { if (source.charAt(at) > 128)
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184 | { if (at != start)
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185 | { reply.append(source.substring(start, at));
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186 | }
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187 |
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188 | if (named)
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189 | { reply.append(nameCodeString(source.charAt(at)));
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190 | }
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191 | else
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192 | { reply.append(codeString(source.charAt(at)));
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193 | }
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194 | start = at + 1;
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195 | }
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196 | at ++;
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197 | }
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198 |
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199 | return reply.toString();
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200 | }
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201 |
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202 | public static String decodeText(String source)
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203 | { int start, end, loff, roff;
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204 | int sstart, send, test;
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205 | int startoff, endoff, baseoff;
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206 | boolean matched;
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207 | String tail;
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208 | StringBuffer reply;
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209 |
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210 | if (source == null)
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211 | { return null;
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212 | }
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213 |
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214 | if (HTMLEntity.entities == null)
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215 | { getEntities();
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216 | }
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217 |
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218 | reply = new StringBuffer();
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219 | baseoff = 0;
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220 |
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221 | tail = source;
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222 | do
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223 | { // get next ampersand
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224 | startoff = tail.indexOf('&');
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225 | if (startoff < 0 || startoff == tail.length() - 1)
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226 | { break;
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227 | }
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228 |
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229 | // if it's followed by a hash, evaluate as a number
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230 | if (tail.charAt(startoff + 1) == '#')
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231 | { if (startoff < tail.length() - 2 &&
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232 | tail.charAt(startoff+2) >= '0' &&
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233 | tail.charAt(startoff+2) <= '9')
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234 | { int code;
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235 |
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236 | loff = startoff + 2;
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237 | while (tail.charAt(loff) >= '0' &&
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238 | tail.charAt(loff) <= '9')
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239 | { loff ++;
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240 | }
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241 |
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242 | code = Integer.parseInt(tail.substring(startoff+2, loff));
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243 | reply.append(tail.substring(0, startoff));
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244 | reply.append(new Character((char) code));
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245 |
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246 | if (tail.charAt(loff) == ';')
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247 | { loff ++;
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248 | }
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249 | loff = loff - startoff - 1;
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250 | }
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251 | else
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252 | { loff = 0;
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253 | reply.append(tail.substring(0, startoff+1));
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254 | }
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255 | }
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256 | else
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257 | { start = 0;
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258 | end = HTMLEntity.entities.size();
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259 | loff = 0;
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260 |
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261 | while (startoff+1+loff < tail.length() && start != end)
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262 | { sstart = start;
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263 | send = end;
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264 | test = (sstart + send) >> 1;
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265 |
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266 | matched = false;
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267 |
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268 | roff = startoff + 1 + loff;
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269 |
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270 | while (sstart != send)
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271 | { test = (sstart + send) >> 1;
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272 |
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273 | if (tail.charAt(roff) < ((HTMLEntity) HTMLEntity.entities.elementAt(test)).name.charAt(loff))
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274 | { send = test;
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275 | }
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276 | else if (tail.charAt(roff) > ((HTMLEntity) HTMLEntity.entities.elementAt(test)).name.charAt(loff))
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277 | { sstart = test + 1;
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278 | }
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279 | else
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280 | { break;
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281 | }
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282 | }
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283 |
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284 | // System.out.println(sstart+">"+send+":"+loff);
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285 |
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286 | if (sstart != send) // found a match
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287 | { sstart = test;
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288 | while (sstart >= start &&
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289 | tail.charAt(roff) ==
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290 | ((HTMLEntity) HTMLEntity.entities.elementAt(sstart)).name.charAt(loff))
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291 | { sstart --;
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292 | }
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293 | sstart ++;
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294 |
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295 | send = test + 1;
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296 | while (send < end &&
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297 | tail.charAt(roff) ==
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298 | ((HTMLEntity) HTMLEntity.entities.elementAt(send)).name.charAt(loff))
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299 | { send ++;
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300 | }
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301 |
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302 | // System.out.println(sstart+"!"+send+":"+loff);
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303 |
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304 | start = sstart;
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305 | end = send;
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306 | }
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307 | else
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308 | { loff = 0;
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309 | reply.append(tail.substring(0, startoff+1));
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310 | break;
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311 | }
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312 |
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313 | // System.out.println(start+">"+end+":"+loff);
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314 |
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315 | loff ++;
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316 | if (end == start + 1 &&
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317 | ((HTMLEntity) HTMLEntity.entities.elementAt(test)).name.length() == loff)
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318 | { reply.append(tail.substring(0, startoff));
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319 | reply.append(((HTMLEntity) HTMLEntity.entities.elementAt(test)).toString());
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320 | if (roff < tail.length() - 1 && tail.charAt(roff+1) == ';')
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321 | { loff ++;
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322 | }
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323 | break;
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324 | }
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325 | }
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326 | }
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327 |
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328 | tail = tail.substring(startoff + 1 + loff);
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329 | } while (tail != null && tail.length() > 0);
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330 |
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331 | if (tail != null)
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332 | { reply.append(tail);
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333 | }
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334 | return reply.toString();
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335 | }
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336 |
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337 | public static void main(String args[])
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338 | { String reply;
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339 |
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340 | getEntities();
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341 |
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342 | reply = decodeText(args[0]);
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343 | System.out.println(reply);
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344 | }
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345 | }
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346 |
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