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ebnf_node.hh

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/*
 *  File:       ebnf_node.hh
 *              $Id: ebnf_node.hh,v 1.7 2002/05/27 03:00:31 alec Exp $
 *
 *  Author:     Alec Panovici (alecu@email.com)
 * 
 *  Comments:
 *
 *  Revision history:
 *
 *  $Log: ebnf_node.hh,v $
 *  Revision 1.7  2002/05/27 03:00:31  alec
 *  doc update
 *
 *  Revision 1.6  2002/05/16 21:36:01  alec
 *  parser generation done
 *
 *  Revision 1.5  2002/05/10 18:08:36  alec
 *  *** empty log message ***
 *
 *  Revision 1.4  2002/05/08 18:18:06  alec
 *  *** empty log message ***
 *
 *  Revision 1.3  2002/04/29 09:34:10  alec
 *  scanner ptree building compiles
 *
 */


/*
  Copyright (C) 2002 Alexandru Panoviciu (alecu@email.com)

  This program 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.

  This program 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 this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#ifndef __EBNF_NODE_HH__
#define __EBNF_NODE_HH__

#include "debug.h"
#include "parse_util.hh"
#include "ebnf_node_algo.hh"

class EbnfNodeAlgo;
class EbnfNodeAlgoException;


class EbnfNode
{
public:

  EbnfNode (const Position &pos_) : pos(pos_)
  {}

  virtual EbnfNode* clone () = 0;
  
  virtual bool isLeaf () { return getChildCount() == 0; }


  virtual int getChildCount () = 0;

  virtual EbnfNode& operator [] (int index) = 0;

  virtual bool dfTraverse (EbnfNodeAlgo &algo) throw (EbnfNodeAlgoException);

  virtual bool rdfTraverse (EbnfNodeAlgo &algo) throw (EbnfNodeAlgoException);

  
  virtual ~EbnfNode () {}

  const Position& getPos () const { return pos; }
  
#ifdef DEBUG

  virtual void dump (ostream &os) const = 0;
  
#endif

private:

  Position pos;
};

#endif /* #ifndef __EBNF_NODE_HH__ */

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