code: /**
   * Copyright (c) 2005, Regents of the University of California
   * 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 University of California, Los Angeles 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 INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * Creation date: Oct 3, 2005
   */
  
  package jintgen.types;
  
  import cck.parser.AbstractToken;
  import cck.util.Util;
  import java.util.List;
  
  /**
   * The <code>SignDimension</code> class represents a sign dimension that applies to integer
   * variables. The sign dimension indicates the presence of a signed bit.
   *
   * @author Ben L. Titzer
   */
  public class SignDimension extends TypeCon.Dimension {
  
      public SignDimension() {
          super("sign");
      }
  
      public Object build(TypeEnv te, List<Object> params) {
          boolean signed = true;
          if ( params.size() > 1) throw Util.failure("sign type dimension expects 0 or 1 parameters");
          if ( params.size() == 1 ) {
              Object obj = params.get(0);
              if ( obj instanceof AbstractToken )
                  signed = isSigned(((AbstractToken)obj).image);
              else if ( obj instanceof String )
                  signed = isSigned((String)obj);
              else if ( obj instanceof Boolean )
                  signed = (Boolean)obj;
              else throw Util.failure("sign type dimension expects AbstractToken, String or Boolean");
          }
          return signed;
      }
  
      private boolean isSigned(String str) {
          if ("+".equals(str) ) return false;
          if ("-".equals(str) ) return true;
          throw Util.failure("sign type dimension expects \"+\" or \"-\"");
      }
  }
  