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1 package ppg.atoms;
2
3 import java.util.*;
4
5 public class Precedence
6 {
7 public static final int LEFT = 0;
8 public static final int RIGHT = 1;
9 public static final int NONASSOC = 2;
10
11 private int type;
12 private Vector symbols;
13
14 public Precedence(int type, Vector syms) {
15 this.type = type;
16 symbols = syms;
17 }
18
19 public Object  clone () {
20 Vector newSyms = new Vector();
21 for (int i=0; i < symbols.size(); i++) {
22 newSyms.addElement( ((GrammarSymbol)symbols.elementAt(i)).clone() );
23 }
24 return new Precedence(type, newSyms);
25 }
26
27 public String toString () {
28 String result = "precedence ";
29 switch (type) {
30 case (LEFT): result += "left "; break;
31 case (RIGHT): result += "right "; break;
32 case (NONASSOC): result += "nonassoc "; break;
33 }
34
35 for (int i=0; i < symbols.size(); i++) {
36 result += symbols.elementAt(i);
37 if (i < symbols.size() - 1)
38 result += ", ";
39 }
40 return result + ";";
41 }
42 }
43 |
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