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1 package ro.infoiasi.donald.compiler.cfg;
2
3 import java.util.*;
4
5 public class Terminals {
6 private Map termByName = new HashMap();
7 private List termByIndex = new ArrayList();
8
9 public Terminal addNew(String  name, String type) {
10 Terminal term = new Terminal(name, count(), type);
11 if (termByName.containsKey(name)) {
12 throw new RuntimeException ("Duplicate Terminal ("+name+")");
13 }
14 termByName.put(name, term);
15 termByIndex.add(term);
16 return term;
17 }
18
19 public Terminal addNew(String name) {
20 return addNew(name, null);
21 }
22
23
24 public final Terminal EOF = find("EOF")!=null? find("EOF"): addNew("EOF");
25
26 public int count() {
27 return termByIndex.size();
28 }
29
30 public Iterator iterator() {
31 return Collections.unmodifiableList(termByIndex).iterator();
32 }
33
34 public Terminal find(String name) {
35 return (Terminal)termByName.get(name);
36 }
37
38 public Terminal find(int index) {
39 if (index < 0 || index >= count()) {
40 return null;
41 } else {
42 return (Terminal)termByIndex.get(index);
43 }
44 }
45
46 public void clear() {
47 termByName.clear();
48 termByIndex.clear();
49 }
50
51 public String toString() {
52 StringBuffer sb = new StringBuffer ();
53 Iterator it = iterator();
54 while (it.hasNext()) {
55 sb.append(it.next());
56 if (it.hasNext()) {
57 sb.append(", ");
58 }
59 }
60 return sb.toString();
61 }
62 }
63 |
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