GrammarAtom


1   package antlr;
2   
3   /* ANTLR Translator Generator
4    * Project led by Terence Parr at http://www.jGuru.com
5    * Software rights: http://www.antlr.org/RIGHTS.html
6    *
7    * $Id: //depot/code/org.antlr/main/main/antlr/GrammarAtom.java#6 $
8    */
9   
10  /** A GrammarAtom is either a token ref, a character ref, or string.
11   * The analysis doesn't care.
12   */
13  abstract class GrammarAtom extends AlternativeElement {
14      protected String   label;
15      protected String   atomText;
16      protected int tokenType = Token.INVALID_TYPE;
17      protected boolean not = false;  // ~T or ~'c' or ~"foo"
18      /** Set to type of AST node to create during parse.  Defaults to what is
19       *  set in the TokenSymbol.
20       */
21      protected String   ASTNodeType = null;
22  
23      public GrammarAtom(Grammar g, Token t, int autoGenType) {
24          super(g, t, autoGenType);
25          atomText = t.getText();
26      }
27  
28      public String   getLabel() {
29          return label;
30      }
31  
32      public String   getText() {
33          return atomText;
34      }
35  
36      public int getType() {
37          return tokenType;
38      }
39  
40      public void setLabel(String   label_) {
41          label = label_;
42      }
43  
44      public String   getASTNodeType() {
45          return ASTNodeType;
46      }
47  
48      public void setASTNodeType(String   type) {
49          ASTNodeType = type;
50      }
51  
52      public void setOption(Token option, Token value) {
53          if (option.getText().equals("AST")) {
54              setASTNodeType(value.getText());
55          }
56          else {
57              grammar.antlrTool.error("Invalid element option:" + option.getText(),
58                                 grammar.getFilename(), option.getLine(), option.getColumn());
59          }
60      }
61  
62      public String   toString() {
63          String   s = " ";
64          if (label != null) s += label + ":";
65          if (not) s += "~";
66          return s + atomText;
67      }
68  }
69
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