/usr/share/doc/jflex/examples/interpreter/SymTab.java is in jflex 1.4.3-3.
This file is owned by root:root, with mode 0o644.
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* Copyright (C) 2001 Gerwin Klein <lsf@jflex.de> *
* Copyright (C) 2001 Bernhard Rumpe <rumpe@in.tum.de> *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License. See the file *
* COPYRIGHT for more information. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import java.util.*;
/**
* Symbol table for the interpreter, contains information about
* variables and functions.
*
* For every binding location of a name a symbol will be created.
* The symbol tables are connected hierarchically by pointers to
* the predecessor. Lookup takes predecessors into account.
*/
public class SymTab {
Hashtable h; // contains the liste of words
// key: String, value: SymtabEntry
SymTab pred; // predecessor symbol table (if exists)
public SymTab() {
this(null);
}
public SymTab(SymTab p) {
h = new Hashtable();
pred = p;
}
public boolean enter(String s, SymtabEntry e) {
Object value = lookup(s);
h.put(s, e);
return(value==null);
}
public SymtabEntry lookup(String s) {
Object value = h.get(s);
if (value==null && pred!=null)
value = pred.lookup(s);
return ((SymtabEntry)value);
}
public String toString() { // for output with print
String res = "symbol table\n=============\n";
Enumeration e = h.keys();
String key;
while(e.hasMoreElements()) {
key = (String)e.nextElement();
res += key+" \t"+h.get(key)+"\n";
}
if (pred!=null) res+="++ predecessor!\n";
return(res);
}
public int size() {
return(h.size());
}
}
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