1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
package tinybasic;
import java.util.*;
public class Scope {
protected Scope prev;
protected Scope global;
Hashtable symbolTable;
protected Scope(Scope prev){
this.prev=prev;
symbolTable = new Hashtable();
}
public Scope cloneScope(Scope prev){
Scope newScope = new Scope(prev);
return newScope;
}
void insertVariable(String v,DTDataType t){
symbolTable.put(v.toLowerCase(),t);
}
public DTDataType getVariable(String v){
DTDataType t=(DTDataType)symbolTable.get(v.toLowerCase());
return t;
}
public int getVariableDimension(String v){
DTDataType t=getVariable(v);
if(t!=null){
return t.getDimension();
} else {
return 0;
}
}
public int getVariableType(String v){
DTDataType t=getVariable(v);
if(t!=null){
return t.getType();
} else {
return 0;
}
}
public boolean isArrayVariable(String s){
return (getVariableDimension(s) > 0);
}
public Scope getPrev(){
return prev;
}
}
|
