code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
  //	
  //------------------------------------------------------------------------------
  //	
  //	This file is part of PRISM.
  //	
  //	PRISM is free software; you can redistribute it and/or modify
  //	it under the terms of the GNU General Public License as published by
  //	the Free Software Foundation; either version 2 of the License, or
  //	(at your option) any later version.
  //	
  //	PRISM 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 PRISM; if not, write to the Free Software Foundation,
  //	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  //	
  //==============================================================================
  
  package parser.visitor;
  
  import parser.ast.*;
  import prism.PrismLangException;
  
  /**
   * Find all idents which are constants, replace with ExpressionConstant, return result.
   */
  public class FindAllConstants extends ASTTraverseModify
  {
  	private ConstantList constantList;
  	
  	public FindAllConstants(ConstantList constantList)
  	{
  		this.constantList = constantList;
  	}
  	
  	public Object visit(ExpressionIdent e) throws PrismLangException
  	{
  		int i;
  		// See if identifier corresponds to a constant
  		i = constantList.getConstantIndex(e.getName());
  		if (i != -1) {
  			// If so, replace it with an ExpressionConstant object
  			ExpressionConstant expr = new ExpressionConstant(e.getName(),  constantList.getConstantType(i));
  			expr.setPosition(e);
  			return expr;
  		}
  		// Otherwise, leave it unchanged
  		return e;
  	}
  }
  
  