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Java > Open Source Codes > persistence > antlr > CharRangeElement


1 package persistence.antlr;
2
3 /* ANTLR Translator Generator
4  * Project led by Terence Parr at http://www.jGuru.com
5  * Software rights: http://www.antlr.org/license.html
6  *
7  */
8
9 class CharRangeElement extends AlternativeElement {
10     String JavaDoc label;
11     protected char begin = 0;
12     protected char end = 0;
13     protected String JavaDoc beginText;
14     protected String JavaDoc endText;
15
16
17     public CharRangeElement(LexerGrammar g, Token t1, Token t2, int autoGenType) {
18         super(g);
19         begin = (char)ANTLRLexer.tokenTypeForCharLiteral(t1.getText());
20         beginText = t1.getText();
21         end = (char)ANTLRLexer.tokenTypeForCharLiteral(t2.getText());
22         endText = t2.getText();
23         line = t1.getLine();
24         // track which characters are referenced in the grammar
25 for (int i = begin; i <= end; i++) {
26             g.charVocabulary.add(i);
27         }
28         this.autoGenType = autoGenType;
29     }
30
31     public void generate() {
32         grammar.generator.gen(this);
33     }
34
35     public String JavaDoc getLabel() {
36         return label;
37     }
38
39     public Lookahead look(int k) {
40         return grammar.theLLkAnalyzer.look(k, this);
41     }
42
43     public void setLabel(String JavaDoc label_) {
44         label = label_;
45     }
46
47     public String JavaDoc toString() {
48         if (label != null)
49             return " " + label + ":" + beginText + ".." + endText;
50         else
51             return " " + beginText + ".." + endText;
52     }
53 }
54
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