/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* JFlex 1.4.1 *
* Copyright (C) 1998-2004 Gerwin Klein <lsf@jflex.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 *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
package weka.core.parser.JFlex;
import java.util.*;
/**
* Simple symbol table, mapping lexical state names to integers.
*
* @author Gerwin Klein
* @version JFlex 1.4.1, $Revision: 1.1 $, $Date: 2008/05/09 09:14:11 $
*/
public class LexicalStates {
/** maps state name to state number */
Hashtable states;
/** codes of inclusive states (subset of states) */
Vector inclusive;
/** number of declared states */
int numStates;
/**
* constructs a new lexical state symbol table
*/
public LexicalStates() {
states = new Hashtable();
inclusive = new Vector();
}
/**
* insert a new state declaration
*/
public void insert(String name, boolean is_inclusive) {
if ( states.containsKey(name) ) return;
Integer code = new Integer(numStates++);
states.put(name, code);
if (is_inclusive)
inclusive.addElement(code);
}
/**
* returns the number (code) of a declared state,
* <code>null</code> if no such state has been declared.
*/
public Integer getNumber(String name) {
return (Integer) states.get(name);
}
/**
* returns the number of declared states
*/
public int number() {
return numStates;
}
/**
* returns the names of all states
*/
public Enumeration names() {
return states.keys();
}
/**
* returns the code of all inclusive states
*/
public Enumeration getInclusiveStates() {
return inclusive.elements();
}
}