/*  G-Cows - scripting language for creation of web sites
    Copyright (C) 2002, 2003, 2004, 2005, 2006 Andrea Sozzi

This file is part of G-Cows.

G-Cows 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, or (at your option)
any later version.

G-Cows 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; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#ifndef SRC_NEST_H
#define SRC_NEST_H

#include <vector>
#include "common.H"

typedef std::vector<int>              Starting_conditions;
typedef Starting_conditions::iterator Conditions_iter;

/* Handle identification of nested cows-tags; every time flex finds out       
   a new open tag the current `start condition' is saved within `conditions'  
   via the `save_condition' function. When the tag is closed, the previous     
   start condition is restored.  */

class Nested_tags {
public:
       Nested_tags         (int state) : has_tags (false) 
                                       { conditions.push_back (state); }
  void save_condition      (int state) { conditions.push_back (state); }
  int  restore_condition   ();
  void reset_conditions    ();
  void set_file_has_tags   ()   { has_tags = true;  }
  void unset_file_has_tags ()   { has_tags = false; }
  bool file_has_tags       ()   { return has_tags;  }
protected:
  Starting_conditions conditions;
  bool                has_tags;
};

#endif // ! SRC_NEST_H