position.hh

parse fuzzy contrl language file

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

/* Positions for Bison parsers in C++

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   along with this program; if not, write to the Free Software
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   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
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   This special exception was added by the Free Software Foundation in
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/**
 ** \file position.hh
 ** Define the yy::position class.
 */

#ifndef BISON_POSITION_HH
# define BISON_POSITION_HH

# include <iostream>
# include <string>

namespace yy
{
  /// Abstract a position.
  class position
  {
  public:

    /// Construct a position.
    position ()
      : filename (0), line (1), column (0)
    {
    }


    /// Initialization.
    inline void initialize (std::string* fn)
    {
      filename = fn;
      line = 1;
      column = 0;
    }

    /** \name Line and Column related manipulators
     ** \{ */
  public:
    /// (line related) Advance to the COUNT next lines.
    inline void lines (int count = 1)
    {
      column = 0;
      line += count;
    }

    /// (column related) Advance to the COUNT next columns.
    inline void columns (int count = 1)
    {
      int leftmost = 0;
      int current  = column;
      if (leftmost <= current + count)
	column += count;
      else
	column = 0;
    }
    /** \} */

  public:
    /// File name to which this position refers.
    std::string* filename;
    /// Current line number.
    unsigned int line;
    /// Current column number.
    unsigned int column;
  };

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

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

  /// Add and assign a position.
  inline const position&
  operator-= (position& res, const int width)
  {
    return res += -width;
  }

  /// Add two position objects.
  inline const position
  operator- (const position& begin, const int width)
  {
    return begin + -width;
  }

  /** \brief Intercept output stream redirection.
   ** \param ostr the destination output stream
   ** \param pos a reference to the position to redirect
   */
  inline std::ostream&
  operator<< (std::ostream& ostr, const position& pos)
  {
    if (pos.filename)
      ostr << *pos.filename << ':';
    return ostr << pos.line << '.' << pos.column;
  }

}
#endif // not BISON_POSITION_HH