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JFlex is a lexical analyzer generator (also known as scanner generator) for Java™, written in Java.

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package java_cup.runtime;

/**
 * Creates the Symbols interface, which CUP uses as default
 *
 * @version last updated 27-03-2006
 * @author Michael Petter
 */

/* *************************************************
  Interface SymbolFactory
  
  interface for creating new symbols  
  You can also use this interface for your own callback hooks
  Declare Your own factory methods for creation of Objects in Your scanner!
 ***************************************************/
public interface SymbolFactory {
    // Factory methods
    /**
     * Construction with left/right propagation switched on
     */
    public Symbol newSymbol(String name, int id, Symbol left, Symbol right, Object value);
    public Symbol newSymbol(String name, int id, Symbol left, Symbol right);
    /**
     * Construction with left/right propagation switched off
     */
    public Symbol newSymbol(String name, int id, Object value);
    public Symbol newSymbol(String name, int id);
    /**
     * Construction of start symbol
     */
    public Symbol startSymbol(String name, int id, int state);
}