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JavaCC is a parser/scanner generator for Java.

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/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 */
package org.javacc.parser;

/**
 * Describes zero-or-one regular expressions ().
 */

public class RZeroOrOne extends RegularExpression {

  /**
   * The regular expression which is repeated zero or one times.
   */
  public RegularExpression regexpr;

  public Nfa GenerateNfa(boolean ignoreCase)
  {
     Nfa retVal = new Nfa();
     NfaState startState = retVal.start;
     NfaState finalState = retVal.end;

     Nfa temp = regexpr.GenerateNfa(ignoreCase);

     startState.AddMove(temp.start);
     startState.AddMove(finalState);
     temp.end.AddMove(finalState);

     return retVal;
  }

}