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import java.util.Hashtable;
import java.util.Enumeration;
import java.io.*;
/** A set of symbols (type defs and/or variables) */
public class Scope implements Serializable {
protected Scope parent;
protected Hashtable symbols = new Hashtable();
public Scope(Scope parent) {
this.parent = parent;
}
public void addSymbol(Symbol s) {
if ( s.getName() != null ) {
symbols.put(s.getName(), s);
}
}
/** Look up name in this scope or parent */
public Symbol resolve(String name) {
Symbol s = (Symbol)symbols.get(name);
if ( s==null ) {
return parent.resolve(name);
}
return s;
}
public String toString() {
return "Scope=["+symbols+"]"+(parent==null?"<root>":"");
}
}
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