xref: /external/bison/examples/calc++/position.hh

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/* Positions for Bison parsers in C++

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/**
 ** \file ../../../../examples/calc++/position.hh
 ** Define the yy::position class.
 */

#ifndef YY_YY_EXAMPLES_CALC_POSITION_HH_INCLUDED
# define YY_YY_EXAMPLES_CALC_POSITION_HH_INCLUDED

# include <algorithm> // std::max
# include <iostream>
# include <string>

# ifndef YY_NULL
#  if defined __cplusplus && 201103L <= __cplusplus
#   define YY_NULL nullptr
#  else
#   define YY_NULL 0
#  endif
# endif


namespace yy {
/* Line 36 of location.cc  */
#line 57 "../../../../examples/calc++/position.hh"
  /// Abstract a position.
  class position
  {
  public:

    /// Construct a position.
    explicit position (std::string* f = YY_NULL,
                       unsigned int l = 1u,
                       unsigned int c = 1u)
      : filename (f)
      , line (l)
      , column (c)
    {
    }


    /// Initialization.
    void initialize (std::string* fn = YY_NULL,
                     unsigned int l = 1u,
                     unsigned int c = 1u)
    {
      filename = fn;
      line = l;
      column = c;
    }

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

    /// (column related) Advance to the COUNT next columns.
    void columns (int count = 1)
    {
      column = std::max (1u, column + count);
    }
    /** \} */

    /// 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 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 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;
  }

  /// Compare two position objects.
  inline bool
  operator== (const position& pos1, const position& pos2)
  {
    return (pos1.line == pos2.line
            && pos1.column == pos2.column
            && (pos1.filename == pos2.filename
                || (pos1.filename && pos2.filename
                    && *pos1.filename == *pos2.filename)));
  }

  /// Compare two position objects.
  inline bool
  operator!= (const position& pos1, const position& pos2)
  {
    return !(pos1 == pos2);
  }

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


} // yy
/* Line 148 of location.cc  */
#line 172 "../../../../examples/calc++/position.hh"
#endif /* !YY_YY_EXAMPLES_CALC_POSITION_HH_INCLUDED  */