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Java > Open Source Codes > gnu > regexp > RETokenPOSIX


1 /*
2  * gnu/regexp/RETokenPOSIX.java
3  * Copyright (C) 1998-2001 Wes Biggs
4  *
5  * This library is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License as published
7  * by the Free Software Foundation; either version 2.1 of the License, or
8  * (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19
20 package gnu.regexp;
21
22 final class RETokenPOSIX extends REToken {
23   int type;
24   boolean insens;
25   boolean negated;
26
27   static final int ALNUM = 0;
28   static final int ALPHA = 1;
29   static final int BLANK = 2;
30   static final int CNTRL = 3;
31   static final int DIGIT = 4;
32   static final int GRAPH = 5;
33   static final int LOWER = 6;
34   static final int PRINT = 7;
35   static final int PUNCT = 8;
36   static final int SPACE = 9;
37   static final int UPPER = 10;
38   static final int XDIGIT = 11;
39
40   // Array indices correspond to constants defined above.
41 static final String JavaDoc[] s_nameTable = {
42     "alnum", "alpha", "blank", "cntrl", "digit", "graph", "lower",
43     "print", "punct", "space", "upper", "xdigit"
44   };
45
46   // The RE constructor uses this to look up the constant for a string
47 static int intValue(String JavaDoc key) {
48     for (int i = 0; i < s_nameTable.length; i++) {
49       if (s_nameTable[i].equals(key)) return i;
50     }
51     return -1;
52   }
53
54   RETokenPOSIX(int subIndex, int type, boolean insens, boolean negated) {
55     super(subIndex);
56     this.type = type;
57     this.insens = insens;
58     this.negated = negated;
59   }
60
61     int getMinimumLength() {
62     return 1;
63     }
64
65     boolean match(CharIndexed input, REMatch mymatch) {
66     char ch = input.charAt(mymatch.index);
67     if (ch == CharIndexed.OUT_OF_BOUNDS)
68       return false;
69     
70     boolean retval = false;
71     switch (type) {
72     case ALNUM:
73     // Note that there is some debate over whether '_' should be included
74 retval = Character.isLetterOrDigit(ch) || (ch == '_');
75     break;
76     case ALPHA:
77     retval = Character.isLetter(ch);
78     break;
79     case BLANK:
80     retval = ((ch == ' ') || (ch == '\t'));
81     break;
82     case CNTRL:
83     retval = Character.isISOControl(ch);
84     break;
85     case DIGIT:
86     retval = Character.isDigit(ch);
87     break;
88     case GRAPH:
89     retval = (!(Character.isWhitespace(ch) || Character.isISOControl(ch)));
90     break;
91     case LOWER:
92     retval = ((insens && Character.isLetter(ch)) || Character.isLowerCase(ch));
93     break;
94     case PRINT:
95     retval = (!(Character.isWhitespace(ch) || Character.isISOControl(ch)))
96         || (ch == ' ');
97     break;
98     case PUNCT:
99     // This feels sloppy, especially for non-U.S. locales.
100 retval = ("`~!@#$%^&*()-_=+[]{}\\|;:'\"/?,.<>".indexOf(ch)!=-1);
101     break;
102     case SPACE:
103     retval = Character.isWhitespace(ch);
104     break;
105     case UPPER:
106     retval = ((insens && Character.isLetter(ch)) || Character.isUpperCase(ch));
107     break;
108     case XDIGIT:
109     retval = (Character.isDigit(ch) || ("abcdefABCDEF".indexOf(ch)!=-1));
110     break;
111     }
112
113     if (negated) retval = !retval;
114     if (retval) {
115     ++mymatch.index;
116     return next(input, mymatch);
117     }
118     else return false;
119   }
120
121   void dump(StringBuffer JavaDoc os) {
122     if (negated) os.append('^');
123     os.append("[:" + s_nameTable[type] + ":]");
124   }
125 }
126
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