libjava/gnu/regexp/RETokenPOSIX.java

   1 /* gnu/regexp/RETokenPOSIX.java
   2    Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.regexp;
  40
  41 final class RETokenPOSIX extends REToken {
  42   int type;
  43   boolean insens;
  44   boolean negated;
  45
  46   static final int  ALNUM = 0;
  47   static final int  ALPHA = 1;
  48   static final int  BLANK = 2;
  49   static final int  CNTRL = 3;
  50   static final int  DIGIT = 4;
  51   static final int  GRAPH = 5;
  52   static final int  LOWER = 6;
  53   static final int  PRINT = 7;
  54   static final int  PUNCT = 8;
  55   static final int  SPACE = 9;
  56   static final int  UPPER = 10;
  57   static final int XDIGIT = 11;
  58
  59   // Array indices correspond to constants defined above.
  60   static final String[] s_nameTable =  {
  61     "alnum", "alpha", "blank", "cntrl", "digit", "graph", "lower",
  62     "print", "punct", "space", "upper", "xdigit"
  63   };
  64
  65   // The RE constructor uses this to look up the constant for a string
  66   static int intValue(String key) {
  67     for (int i = 0; i < s_nameTable.length; i++) {
  68       if (s_nameTable[i].equals(key)) return i;
  69     }
  70     return -1;
  71   }
  72
  73   RETokenPOSIX(int subIndex, int type, boolean insens, boolean negated) {
  74     super(subIndex);
  75     this.type = type;
  76     this.insens = insens;
  77     this.negated = negated;
  78   }
  79
  80     int getMinimumLength() {
  81         return 1;
  82     }
  83
  84     boolean match(CharIndexed input, REMatch mymatch) {
  85     char ch = input.charAt(mymatch.index);
  86     if (ch == CharIndexed.OUT_OF_BOUNDS)
  87       return false;
  88
  89     boolean retval = false;
  90     switch (type) {
  91     case ALNUM:
  92         // Note that there is some debate over whether '_' should be included
  93         retval = Character.isLetterOrDigit(ch) || (ch == '_');
  94         break;
  95     case ALPHA:
  96         retval = Character.isLetter(ch);
  97         break;
  98     case BLANK:
  99         retval = ((ch == ' ') || (ch == '\t'));
 100         break;
 101     case CNTRL:
 102         retval = Character.isISOControl(ch);
 103         break;
 104     case DIGIT:
 105         retval = Character.isDigit(ch);
 106         break;
 107     case GRAPH:
 108         retval = (!(Character.isWhitespace(ch) || Character.isISOControl(ch)));
 109         break;
 110     case LOWER:
 111         retval = ((insens && Character.isLetter(ch)) || Character.isLowerCase(ch));
 112         break;
 113     case PRINT:
 114         retval = (!(Character.isWhitespace(ch) || Character.isISOControl(ch)))
 115             || (ch == ' ');
 116         break;
 117     case PUNCT:
 118         // This feels sloppy, especially for non-U.S. locales.
 119         retval = ("`~!@#$%^&*()-_=+[]{}\\|;:'\"/?,.<>".indexOf(ch)!=-1);
 120         break;
 121     case SPACE:
 122         retval = Character.isWhitespace(ch);
 123         break;
 124     case UPPER:
 125         retval = ((insens && Character.isLetter(ch)) || Character.isUpperCase(ch));
 126         break;
 127     case XDIGIT:
 128         retval = (Character.isDigit(ch) || ("abcdefABCDEF".indexOf(ch)!=-1));
 129         break;
 130     }
 131
 132     if (negated) retval = !retval;
 133     if (retval) {
 134         ++mymatch.index;
 135         return next(input, mymatch);
 136     }
 137     else return false;
 138   }
 139
 140   void dump(StringBuffer os) {
 141     if (negated) os.append('^');
 142     os.append("[:" + s_nameTable[type] + ":]");
 143   }
 144 }