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1
8
9 package beaver.spec.ast;
10
11 import beaver.Symbol;
12
13 public class Rule extends Node
14 {
15 static public class Definition extends Node
16 {
17 static public class Element extends Node
18 {
19 public final Symbol sym_name;
20 public final Symbol alias;
21 public final Symbol ebnf_sym;
22
23 public Element(Symbol sym_name, Symbol alias, Symbol ebnf_sym)
24 {
25 this.sym_name = sym_name;
26 this.alias = alias;
27 this.ebnf_sym = ebnf_sym;
28 }
29
30 public void accept(TreeWalker walker)
31 {
32 walker.visit(this);
33 }
34
35 public String  getName()
36 {
37 return (String ) sym_name.value;
38 }
39
40 public String getAlias()
41 {
42 return (String ) alias.value;
43 }
44
45 public char getExtUseMark()
46 {
47 return ebnf_sym.value == null ? ' ' : ((String ) ebnf_sym.value).charAt(0);
48 }
49 }
50
51 public final Element[] elements;
52 public final Symbol prec_sym_name;
53 public final Symbol code;
54
55 public Definition(Element[] elts, Symbol prec_sym_name, Symbol code)
56 {
57 this.elements = elts;
58 this.prec_sym_name = prec_sym_name;
59 this.code = code;
60 }
61
62 public Definition(Element[] elts)
63 {
64 this.elements = elts;
65 this.prec_sym_name = null;
66 this.code = null;
67 }
68
69 public void accept(TreeWalker walker)
70 {
71 walker.visit(this);
72 }
73
74 public String getPrecedenceSymbolName()
75 {
76 return (String ) prec_sym_name.value;
77 }
78
79 public String getReduceActionCode()
80 {
81 return (String ) code.value;
82 }
83 }
84
85 public final Symbol lhs_sym;
86 public final Definition[] defs;
87
88 public Rule(Symbol lhs_sym, Rule.Definition[] defs)
89 {
90 this.lhs_sym = lhs_sym;
91 this.defs = defs;
92 }
93
94 public String getLHSSymbolName()
95 {
96 return (String ) lhs_sym.value;
97 }
98
99 public void accept(TreeWalker walker)
100 {
101 walker.visit(this);
102 }
103 }
104 |
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