data/location.cc

   1 m4_divert(-1)
   2
   3 # C++ skeleton for Bison
   4
   5 # Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   6
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20 # 02110-1301  USA
  21
  22 m4_include(b4_pkgdatadir/[c++.m4])
  23
  24 # We do want M4 expansion after # for CPP macros.
  25 m4_changecom()
  26 m4_divert(0)dnl
  27 @output b4_dir_prefix[]position.hh
  28 b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004, 2005])[
  29
  30 /**
  31  ** \file position.hh
  32  ** Define the position class.
  33  */
  34
  35 #ifndef BISON_POSITION_HH
  36 # define BISON_POSITION_HH
  37
  38 # include <iostream>
  39 # include <string>
  40
  41 namespace yy
  42 {
  43   /// Abstract a position.
  44   class position
  45   {
  46   public:
  47     /// Initial column number.
  48     static const unsigned int initial_column = 0;
  49     /// Initial line number.
  50     static const unsigned int initial_line = 1;
  51
  52     /** \name Ctor & dtor.
  53      ** \{ */
  54   public:
  55     /// Construct a position.
  56     position () :
  57       filename (0),
  58       line (initial_line),
  59       column (initial_column)
  60     {
  61     }
  62     /** \} */
  63
  64
  65     /** \name Line and Column related manipulators
  66      ** \{ */
  67   public:
  68     /// (line related) Advance to the COUNT next lines.
  69     inline void lines (int count = 1)
  70     {
  71       column = initial_column;
  72       line += count;
  73     }
  74
  75     /// (column related) Advance to the COUNT next columns.
  76     inline void columns (int count = 1)
  77     {
  78       int leftmost = initial_column;
  79       int current  = column;
  80       if (leftmost <= current + count)
  81         column += count;
  82       else
  83         column = initial_column;
  84     }
  85     /** \} */
  86
  87   public:
  88     /// File name to which this position refers.
  89     ]b4_filename_type[* filename;
  90     /// Current line number.
  91     unsigned int line;
  92     /// Current column number.
  93     unsigned int column;
  94   };
  95
  96   /// Add and assign a position.
  97   inline const position&
  98   operator+= (position& res, const int width)
  99   {
 100     res.columns (width);
 101     return res;
 102   }
 103
 104   /// Add two position objects.
 105   inline const position
 106   operator+ (const position& begin, const int width)
 107   {
 108     position res = begin;
 109     return res += width;
 110   }
 111
 112   /// Add and assign a position.
 113   inline const position&
 114   operator-= (position& res, const int width)
 115   {
 116     return res += -width;
 117   }
 118
 119   /// Add two position objects.
 120   inline const position
 121   operator- (const position& begin, const int width)
 122   {
 123     return begin + -width;
 124   }
 125
 126   /** \brief Intercept output stream redirection.
 127    ** \param ostr the destination output stream
 128    ** \param pos a reference to the position to redirect
 129    */
 130   inline std::ostream&
 131   operator<< (std::ostream& ostr, const position& pos)
 132   {
 133     if (pos.filename)
 134       ostr << *pos.filename << ':';
 135     return ostr << pos.line << '.' << pos.column;
 136   }
 137
 138 }
 139 #endif // not BISON_POSITION_HH]
 140 @output b4_dir_prefix[]location.hh
 141 b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004, 2005])[
 142
 143 /**
 144  ** \file location.hh
 145  ** Define the location class.
 146  */
 147
 148 #ifndef BISON_LOCATION_HH
 149 # define BISON_LOCATION_HH
 150
 151 # include <iostream>
 152 # include <string>
 153 # include "position.hh"
 154
 155 namespace yy
 156 {
 157
 158   /// Abstract a location.
 159   class location
 160   {
 161     /** \name Ctor & dtor.
 162      ** \{ */
 163   public:
 164     /// Construct a location.
 165     location () :
 166       begin (),
 167       end ()
 168     {
 169     }
 170     /** \} */
 171
 172
 173     /** \name Line and Column related manipulators
 174      ** \{ */
 175   public:
 176     /// Reset initial location to final location.
 177     inline void step ()
 178     {
 179       begin = end;
 180     }
 181
 182     /// Extend the current location to the COUNT next columns.
 183     inline void columns (unsigned int count = 1)
 184     {
 185       end += count;
 186     }
 187
 188     /// Extend the current location to the COUNT next lines.
 189     inline void lines (unsigned int count = 1)
 190     {
 191       end.lines (count);
 192     }
 193     /** \} */
 194
 195
 196   public:
 197     /// Beginning of the located region.
 198     position begin;
 199     /// End of the located region.
 200     position end;
 201   };
 202
 203   /// Join two location objects to create a location.
 204   inline const location operator+ (const location& begin, const location& end)
 205   {
 206     location res = begin;
 207     res.end = end.end;
 208     return res;
 209   }
 210
 211   /// Add two location objects.
 212   inline const location operator+ (const location& begin, unsigned int width)
 213   {
 214     location res = begin;
 215     res.columns (width);
 216     return res;
 217   }
 218
 219   /// Add and assign a location.
 220   inline location& operator+= (location& res, unsigned int width)
 221   {
 222     res.columns (width);
 223     return res;
 224   }
 225
 226   /** \brief Intercept output stream redirection.
 227    ** \param ostr the destination output stream
 228    ** \param loc a reference to the location to redirect
 229    **
 230    ** Avoid duplicate information.
 231    */
 232   inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
 233   {
 234     position last = loc.end - 1;
 235     ostr << loc.begin;
 236     if (last.filename
 237         && (!loc.begin.filename
 238             || *loc.begin.filename != *last.filename))
 239       ostr << '-' << last;
 240     else if (loc.begin.line != last.line)
 241       ostr << '-' << last.line  << '.' << last.column;
 242     else if (loc.begin.column != last.column)
 243       ostr << '-' << last.column;
 244     return ostr;
 245   }
 246
 247 }
 248
 249 #endif // not BISON_LOCATION_HH]
 250 m4_divert(-1)
 251 m4_changecom([#])