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1 package ro.infoiasi.donald.compiler.cfg;
2
3 public class Production {
4 public static final int LAST_TERMINAL_PRECEDENCE = Terminal.NO_PRECEDENCE-1;
5
6 private NonTerminal lhs;
7 private Word rhs;
8 private int index;
9 private int precedence;
10 private SemanticAction action;
11
12 Production(NonTerminal lhs, Word rhs, int index) {
13 this(lhs, rhs, LAST_TERMINAL_PRECEDENCE, null, index);
14 }
15
16 Production(NonTerminal lhs, Word rhs, int precedence,
17 SemanticAction action, int index) {
18 this.lhs = lhs;
19 this.rhs = rhs;
20 if (precedence == LAST_TERMINAL_PRECEDENCE) {
21 WordIterator it = rhs.iterator(true);
22 if (it.hasPrevTerminal()) {
23 this.precedence = it.prevTerminal().getPrecedence();
24 } else {
25 this.precedence = Terminal.NO_PRECEDENCE;
26 }
27 } else {
28 this.precedence = precedence;
29 }
30 this.action = action;
31 this.index = index;
32 }
33
34 public NonTerminal getLHS() {
35 return lhs;
36 }
37
38 public Word getRHS() {
39 return rhs;
40 }
41
42 public int getPrecedence() {
43 return precedence;
44 }
45
46 public SemanticAction getSemanticAction() {
47 return action;
48 }
49
50 void setSemanticAction(SemanticAction action) {
51 this.action = action;
52 }
53
54 public int getIndex() {
55 return index;
56 }
57
58
59 void setIndex(int index) {
60 this.index = index;
61 }
62
63 public boolean equals(Object  o) {
64 return (o instanceof Production &&
65 lhs.equals(((Production)o).lhs) &&
66 rhs.equals(((Production)o).rhs) &&
67 index == ((Production)o).index);
68 }
69
70 public int hashCode() {
71 return index;
72 }
73
74 public String toString() {
75 return lhs+" ::= "+rhs;
76 }
77
78 }
79 |
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