GrammarAtom


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