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ebnf_node_algo.hh

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/*
 *  File:       ebnf_node_algo.hh
 *              $Id: ebnf_node_algo.hh,v 1.6 2002/05/27 03:00:12 alec Exp $
 *
 *  Author:     Alec Panovici (alecu@email.com)
 * 
 *  Comments:
 *
 *  Revision history:
 *
 *  $Log: ebnf_node_algo.hh,v $
 *  Revision 1.6  2002/05/27 03:00:12  alec
 *  doc update
 *
 *  Revision 1.5  2002/05/16 21:34:55  alec
 *  parser generation done
 *
 *  Revision 1.4  2002/05/10 18:08:14  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_ALGO__
#define __EBNF_NODE_ALGO__

#include <stdexcept>

class EbnfNode;

class EbnfNodeAlgoException
{
  public:

  EbnfNodeAlgoException (const string &message_) :
    message(message_),
    pos()
  {}
  
  EbnfNodeAlgoException () :
    message("Bad option"),
    pos()
  {}

  EbnfNodeAlgoException (const Position &pos_, const string &message_) :
    message(message_),
    pos(pos_)
  {}

  virtual const char* what() const throw()
  {
    return message.c_str();
  }

  virtual operator string() const
  {
    return message;
  }

  const Position& where() const
  {
    return pos;
  }
  
protected:
  
  string message;
  Position pos;

};

class EbnfNodeAlgo
{
public:

  virtual bool operator() (EbnfNode &n) throw (EbnfNodeAlgoException) = 0;
};

#endif /* #ifndef __EBNF_NODE_ALGO__ */

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