code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford)
  //	* Mark Kattenbelt <mark.kattenbelt@comlab.ox.ac.uk> (University of Oxford)
  //	
  //------------------------------------------------------------------------------
  //	
  //	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.ast;
  
  import parser.visitor.*;
  import prism.PrismLangException;
  
  /**
   * Variable declaration details
   */
  public class Declaration extends ASTElement
  {
  	// Name
  	protected String name;
  	// Type of declaration
  	protected DeclarationType declType;
  	// Initial value - null if none specified
  	protected Expression start;
  		
  	public Declaration(String name, DeclarationType declType)
  	{
  		setName(name);
  		setDeclType(declType);
  		setStart(null);
  	}
  	
  	// Set methods
  	
  	public void setName(String name)
  	{
  		this.name = name;
  	}	
  
  	public void setDeclType(DeclarationType declType)
  	{
  		this.declType = declType;
  		// The type stored for a Declaration/DeclarationType object
  		// is static - it is not computed during type checking.
  		// (But we re-use the existing "type" field for this purpose)
  		setType(declType.getType());
  	}	
  
  	public void setStart(Expression start)
  	{
  		this.start = start;
  	}
  
  	// Get methods
  
  	public String getName()
  	{
  		return name;
  	}
  
  	public DeclarationType getDeclType()
  	{
  		return declType;
  	}	
  
  	/**
  	 * Get the specified initial value of this variable (null if it was not specified).
  	 * To get the actual value (defaults to lower bound if appropriate),
  	 * use {@link #getStartOrDefault()}.
  	 */
  	public Expression getStart()
  	{
  		return start;
  	}
  	
  	/**
  	 * Get the specified initial value of this variable,
  	* using the default value for its type if not specified.
  	 */
  	public Expression getStartOrDefault()
  	{
  		return isStartSpecified() ? start : declType.getDefaultStart();
  	}
  	
  	/**
  	 * Get the initial value of this variable, within a ModulesFile.
  	 * Will be null if parent ModulesFile passed in has an init...endinit.
  	 * Otherwise defaults to lower bound.
  	 * Can force lower bound to returned by passing in null. 
  	 */
  	
  	/** TODO public abstract Expression getStart(ModulesFile parent); */
  
  	public boolean isStartSpecified()
  	{
  		return start != null;
  	}
  
  	// Methods required for ASTElement:
  	
  	/**
  	 * Visitor method.
  	 */
  	public Object accept(ASTVisitor v) throws PrismLangException
  	{
  		return v.visit(this);
  	}
  
  	/**
  	 * Convert to string.
  	 */
  	@Override
  	public String toString()
  	{
  		String s  = "";
  		s += name + " : ";
  		s += declType;
  		if (start != null) s += " init " + start;
  		return s;
  	}
  
  	/**
  	 * Perform a deep copy.
  	 */
  	@Override
  	public ASTElement deepCopy()
  	{
  		Declaration ret = new Declaration(getName(), (DeclarationType)getDeclType().deepCopy());
  		if (getStart() != null)
  			ret.setStart(getStart().deepCopy());
  		ret.setPosition(this);
  		return ret;
  	}
  }
  
  // ------------------------------------------------------------------------------
  