code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Andrew Hinton <ug60axh@cs.bham.ac.uk> (University of Birmingham)
  //	* 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 userinterface.properties;
  
  import parser.ast.*;
  import prism.*;
  
  public class GUILabel
  {
  	public GUIMultiProperties parent;
  	public String name;
  	public String label;
  	public Exception parseError;
  	
  	public GUILabel(GUIMultiProperties parent, String name, String label)
  	{
  		this.parent = parent;
  		this.name = name;
  		this.label = label;
  		this.parseError = null;
  	}
  	
  	public void parse()
  	{
  		Expression expr = null;
  		this.parseError = null;
  		// See if label definition is parseable
  		try {
  			// Check name is a valid identifier
  			try { expr = parent.getPrism().parseSingleExpressionString(name); }
  			catch (PrismLangException e) { throw new PrismException("Invalid label name \""+name+"\""); }
  			if (expr == null || !(expr instanceof ExpressionIdent)) throw new PrismException("Invalid label name \""+name+"\"");
  			// Check (non-empty) label definition is valid (single) expression
  			try { if (!("".equals(label))) parent.getPrism().parseSingleExpressionString(label); }
  			catch (PrismLangException e) { throw new PrismException("Invalid expression \""+label+"\""); }
  		}
  		catch (PrismException e) {
  			this.parseError = e;
  		}
  	}
  	
  	public boolean isParseable() { return parseError==null; }
  	
  	public String toString()
  	{
  		return "label \""+getNameString()+"\" = "+getValueString()+";";
  	}
  	
  	public String getNameString()
  	{
  		return name;
  	}
  	
  	public String getValueString()
  	{
  		return label;
  	}
  }
  