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Java > Open Source Codes > org > javacc > parser > RRepetitionRange


1 /*
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22
23 package org.javacc.parser;
24
25 import java.util.Vector JavaDoc;
26
27 /**
28  * Describes one-or-more regular expressions (<foo+>).
29  */
30
31 public class RRepetitionRange extends RegularExpression {
32
33   /**
34    * The regular expression which is repeated one or more times.
35    */
36   public RegularExpression regexpr;
37   public int min = 0;
38   public int max = -1;
39   public boolean hasMax;
40
41   public Nfa GenerateNfa(boolean ignoreCase)
42   {
43      Vector JavaDoc units = new Vector JavaDoc();
44      RSequence seq;
45      int i;
46
47      for (i = 0; i < min; i++)
48      {
49         units.addElement(regexpr);
50      }
51
52      if (hasMax && max == -1) // Unlimited
53 {
54         RZeroOrMore zoo = new RZeroOrMore();
55         zoo.regexpr = regexpr;
56         units.addElement(zoo);
57      }
58
59      while (i++ < max)
60      {
61         RZeroOrOne zoo = new RZeroOrOne();
62         zoo.regexpr = regexpr;
63         units.addElement(zoo);
64      }
65      seq = new RSequence(units);
66      return seq.GenerateNfa(ignoreCase);
67   }
68 }
69
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