path: root/src/lib/eval/location.hh

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/**
 ** \file location.hh
 ** Define the isc::eval::location class.
 */

#ifndef YY_EVAL_LOCATION_HH_INCLUDED
# define YY_EVAL_LOCATION_HH_INCLUDED

# include <iostream>
# include <string>

# ifndef YY_NULLPTR
#  if defined __cplusplus
#   if 201103L <= __cplusplus
#    define YY_NULLPTR nullptr
#   else
#    define YY_NULLPTR 0
#   endif
#  else
#   define YY_NULLPTR ((void*)0)
#  endif
# endif

#line 14 "parser.yy"
namespace isc { namespace eval {
#line 59 "location.hh"

  /// A point in a source file.
  class position
  {
  public:
    /// Type for file name.
    typedef const std::string filename_type;
    /// Type for line and column numbers.
    typedef int counter_type;

    /// Construct a position.
    explicit position (filename_type* f = YY_NULLPTR,
                       counter_type l = 1,
                       counter_type c = 1)
      : filename (f)
      , line (l)
      , column (c)
    {}


    /// Initialization.
    void initialize (filename_type* fn = YY_NULLPTR,
                     counter_type l = 1,
                     counter_type c = 1)
    {
      filename = fn;
      line = l;
      column = c;
    }

    /** \name Line and Column related manipulators
     ** \{ */
    /// (line related) Advance to the COUNT next lines.
    void lines (counter_type count = 1)
    {
      if (count)
        {
          column = 1;
          line = add_ (line, count, 1);
        }
    }

    /// (column related) Advance to the COUNT next columns.
    void columns (counter_type count = 1)
    {
      column = add_ (column, count, 1);
    }
    /** \} */

    /// File name to which this position refers.
    filename_type* filename;
    /// Current line number.
    counter_type line;
    /// Current column number.
    counter_type column;

  private:
    /// Compute max (min, lhs+rhs).
    static counter_type add_ (counter_type lhs, counter_type rhs, counter_type min)
    {
      return lhs + rhs < min ? min : lhs + rhs;
    }
  };

  /// Add \a width columns, in place.
  inline position&
  operator+= (position& res, position::counter_type width)
  {
    res.columns (width);
    return res;
  }

  /// Add \a width columns.
  inline position
  operator+ (position res, position::counter_type width)
  {
    return res += width;
  }

  /// Subtract \a width columns, in place.
  inline position&
  operator-= (position& res, position::counter_type width)
  {
    return res += -width;
  }

  /// Subtract \a width columns.
  inline position
  operator- (position res, position::counter_type width)
  {
    return res -= width;
  }

  /** \brief Intercept output stream redirection.
   ** \param ostr the destination output stream
   ** \param pos a reference to the position to redirect
   */
  template <typename YYChar>
  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;
  }

  /// Two points in a source file.
  class location
  {
  public:
    /// Type for file name.
    typedef position::filename_type filename_type;
    /// Type for line and column numbers.
    typedef position::counter_type counter_type;

    /// Construct a location from \a b to \a e.
    location (const position& b, const position& e)
      : begin (b)
      , end (e)
    {}

    /// Construct a 0-width location in \a p.
    explicit location (const position& p = position ())
      : begin (p)
      , end (p)
    {}

    /// Construct a 0-width location in \a f, \a l, \a c.
    explicit location (filename_type* f,
                       counter_type l = 1,
                       counter_type c = 1)
      : begin (f, l, c)
      , end (f, l, c)
    {}


    /// Initialization.
    void initialize (filename_type* f = YY_NULLPTR,
                     counter_type l = 1,
                     counter_type c = 1)
    {
      begin.initialize (f, l, c);
      end = begin;
    }

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

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

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


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

  /// Join two locations, in place.
  inline location&
  operator+= (location& res, const location& end)
  {
    res.end = end.end;
    return res;
  }

  /// Join two locations.
  inline location
  operator+ (location res, const location& end)
  {
    return res += end;
  }

  /// Add \a width columns to the end position, in place.
  inline location&
  operator+= (location& res, location::counter_type width)
  {
    res.columns (width);
    return res;
  }

  /// Add \a width columns to the end position.
  inline location
  operator+ (location res, location::counter_type width)
  {
    return res += width;
  }

  /// Subtract \a width columns to the end position, in place.
  inline location&
  operator-= (location& res, location::counter_type width)
  {
    return res += -width;
  }

  /// Subtract \a width columns to the end position.
  inline location
  operator- (location res, location::counter_type width)
  {
    return res -= width;
  }

  /** \brief Intercept output stream redirection.
   ** \param ostr the destination output stream
   ** \param loc a reference to the location to redirect
   **
   ** Avoid duplicate information.
   */
  template <typename YYChar>
  std::basic_ostream<YYChar>&
  operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
  {
    location::counter_type end_col
      = 0 < loc.end.column ? loc.end.column - 1 : 0;
    ostr << loc.begin;
    if (loc.end.filename
        && (!loc.begin.filename
            || *loc.begin.filename != *loc.end.filename))
      ostr << '-' << loc.end.filename << ':' << loc.end.line << '.' << end_col;
    else if (loc.begin.line < loc.end.line)
      ostr << '-' << loc.end.line << '.' << end_col;
    else if (loc.begin.column < end_col)
      ostr << '-' << end_col;
    return ostr;
  }

#line 14 "parser.yy"
} } // isc::eval
#line 305 "location.hh"

#endif // !YY_EVAL_LOCATION_HH_INCLUDED