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Java > Open Source Codes > JSci > maths > symbolic > Token


1 /* Generated By:JavaCC: Do not edit this line. Token.java Version 3.0 */
2 package JSci.maths.symbolic;
3
4 /**
5  * Describes the input token stream.
6  */
7
8 class Token {
9
10   /**
11    * An integer that describes the kind of this token. This numbering
12    * system is determined by JavaCCParser, and a table of these numbers is
13    * stored in the file ...Constants.java.
14    */
15   public int kind;
16
17   /**
18    * beginLine and beginColumn describe the position of the first character
19    * of this token; endLine and endColumn describe the position of the
20    * last character of this token.
21    */
22   public int beginLine, beginColumn, endLine, endColumn;
23
24   /**
25    * The string image of the token.
26    */
27   public String JavaDoc image;
28
29   /**
30    * A reference to the next regular (non-special) token from the input
31    * stream. If this is the last token from the input stream, or if the
32    * token manager has not read tokens beyond this one, this field is
33    * set to null. This is true only if this token is also a regular
34    * token. Otherwise, see below for a description of the contents of
35    * this field.
36    */
37   public Token next;
38
39   /**
40    * This field is used to access special tokens that occur prior to this
41    * token, but after the immediately preceding regular (non-special) token.
42    * If there are no such special tokens, this field is set to null.
43    * When there are more than one such special token, this field refers
44    * to the last of these special tokens, which in turn refers to the next
45    * previous special token through its specialToken field, and so on
46    * until the first special token (whose specialToken field is null).
47    * The next fields of special tokens refer to other special tokens that
48    * immediately follow it (without an intervening regular token). If there
49    * is no such token, this field is null.
50    */
51   public Token specialToken;
52
53   /**
54    * Returns the image.
55    */
56   public String JavaDoc toString()
57   {
58      return image;
59   }
60
61   /**
62    * Returns a new Token object, by default. However, if you want, you
63    * can create and return subclass objects based on the value of ofKind.
64    * Simply add the cases to the switch for all those special cases.
65    * For example, if you have a subclass of Token called IDToken that
66    * you want to create if ofKind is ID, simlpy add something like :
67    *
68    * case MyParserConstants.ID : return new IDToken();
69    *
70    * to the following switch statement. Then you can cast matchedToken
71    * variable to the appropriate type and use it in your lexical actions.
72    */
73   public static final Token newToken(int ofKind)
74   {
75      switch(ofKind)
76      {
77        default : return new Token();
78      }
79   }
80
81 }
82
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