/* A Bison parser, made by GNU Bison 2.3.  */

/* Locations for Bison parsers in C++

   Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.

   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, 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., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

/* As a special exception, you may create a larger work that contains
   part or all of the Bison parser skeleton and distribute that work
   under terms of your choice, so long as that work isn't itself a
   parser generator using the skeleton or a modified version thereof
   as a parser skeleton.  Alternatively, if you modify or redistribute
   the parser skeleton itself, you may (at your option) remove this
   special exception, which will cause the skeleton and the resulting
   Bison output files to be licensed under the GNU General Public
   License without this special exception.

   This special exception was added by the Free Software Foundation in
   version 2.2 of Bison.  */

/**
 ** \file location.hh
 ** Define the yy::location class.
 */

#ifndef BISON_LOCATION_HH
# define BISON_LOCATION_HH

# include <iostream>
# include <string>
# include "position.hh"

namespace yy
{

  /// Abstract a location.
  class location
  {
  public:

    /// Construct a location.
    location ()
      : begin (), end ()
    {
    }


    /// Initialization.
    inline void initialize (std::string* fn)
    {
      begin.initialize (fn);
      end = begin;
    }

    /** \name Line and Column related manipulators
     ** \{ */
  public:
    /// Reset initial location to final location.
    inline void step ()
    {
      begin = end;
    }

    /// Extend the current location to the COUNT next columns.
    inline void columns (unsigned int count = 1)
    {
      end += count;
    }

    /// Extend the current location to the COUNT next lines.
    inline void lines (unsigned int count = 1)
    {
      end.lines (count);
    }
    /** \} */


  public:
    /// Beginning of the located region.
    position begin;
    /// End of the located region.
    position end;
  };

  /// Join two location objects to create a location.
  inline const location operator+ (const location& begin, const location& end)
  {
    location res = begin;
    res.end = end.end;
    return res;
  }

  /// Add two location objects.
  inline const location operator+ (const location& begin, unsigned int width)
  {
    location res = begin;
    res.columns (width);
    return res;
  }

  /// Add and assign a location.
  inline location& operator+= (location& res, unsigned int width)
  {
    res.columns (width);
    return res;
  }

  /** \brief Intercept output stream redirection.
   ** \param ostr the destination output stream
   ** \param loc a reference to the location to redirect
   **
   ** Avoid duplicate information.
   */
  inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
  {
    position last = loc.end - 1;
    ostr << loc.begin;
    if (last.filename
	&& (!loc.begin.filename
	    || *loc.begin.filename != *last.filename))
      ostr << '-' << last;
    else if (loc.begin.line != last.line)
      ostr << '-' << last.line  << '.' << last.column;
    else if (loc.begin.column != last.column)
      ostr << '-' << last.column;
    return ostr;
  }

}

#endif // not BISON_LOCATION_HH
