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 yy::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 ]m4_ifdef([b4_location_constructors], [
  48     /// Construct a position.
  49     position ()
  50       : filename (0), line (1), column (0)
  51     {
  52     }
  53
  54 ])[
  55     /// Initialization.
  56     inline void initialize (]b4_filename_type[* fn)
  57     {
  58       filename = fn;
  59       line = 1;
  60       column = 0;
  61     }
  62
  63     /** \name Line and Column related manipulators
  64      ** \{ */
  65   public:
  66     /// (line related) Advance to the COUNT next lines.
  67     inline void lines (int count = 1)
  68     {
  69       column = 0;
  70       line += count;
  71     }
  72
  73     /// (column related) Advance to the COUNT next columns.
  74     inline void columns (int count = 1)
  75     {
  76       int leftmost = 0;
  77       int current  = column;
  78       if (leftmost <= current + count)
  79         column += count;
  80       else
  81         column = 0;
  82     }
  83     /** \} */
  84
  85   public:
  86     /// File name to which this position refers.
  87     ]b4_filename_type[* filename;
  88     /// Current line number.
  89     unsigned int line;
  90     /// Current column number.
  91     unsigned int column;
  92   };
  93
  94   /// Add and assign a position.
  95   inline const position&
  96   operator+= (position& res, const int width)
  97   {
  98     res.columns (width);
  99     return res;
 100   }
 101
 102   /// Add two position objects.
 103   inline const position
 104   operator+ (const position& begin, const int width)
 105   {
 106     position res = begin;
 107     return res += width;
 108   }
 109
 110   /// Add and assign a position.
 111   inline const position&
 112   operator-= (position& res, const int width)
 113   {
 114     return res += -width;
 115   }
 116
 117   /// Add two position objects.
 118   inline const position
 119   operator- (const position& begin, const int width)
 120   {
 121     return begin + -width;
 122   }
 123
 124   /** \brief Intercept output stream redirection.
 125    ** \param ostr the destination output stream
 126    ** \param pos a reference to the position to redirect
 127    */
 128   inline std::ostream&
 129   operator<< (std::ostream& ostr, const position& pos)
 130   {
 131     if (pos.filename)
 132       ostr << *pos.filename << ':';
 133     return ostr << pos.line << '.' << pos.column;
 134   }
 135
 136 }
 137 #endif // not BISON_POSITION_HH]
 138 @output b4_dir_prefix[]location.hh
 139 b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004, 2005])[
 140
 141 /**
 142  ** \file location.hh
 143  ** Define the yy::location class.
 144  */
 145
 146 #ifndef BISON_LOCATION_HH
 147 # define BISON_LOCATION_HH
 148
 149 # include <iostream>
 150 # include <string>
 151 # include "position.hh"
 152
 153 namespace yy
 154 {
 155
 156   /// Abstract a location.
 157   class location
 158   {
 159   public:
 160 ]m4_ifdef([b4_location_constructors], [
 161     /// Construct a location.
 162     location ()
 163       : begin (), end ()
 164     {
 165     }
 166
 167 ])[
 168     /// Initialization.
 169     inline void initialize (]b4_filename_type[* fn)
 170     {
 171       begin.initialize (fn);
 172       end = begin;
 173     }
 174
 175     /** \name Line and Column related manipulators
 176      ** \{ */
 177   public:
 178     /// Reset initial location to final location.
 179     inline void step ()
 180     {
 181       begin = end;
 182     }
 183
 184     /// Extend the current location to the COUNT next columns.
 185     inline void columns (unsigned int count = 1)
 186     {
 187       end += count;
 188     }
 189
 190     /// Extend the current location to the COUNT next lines.
 191     inline void lines (unsigned int count = 1)
 192     {
 193       end.lines (count);
 194     }
 195     /** \} */
 196
 197
 198   public:
 199     /// Beginning of the located region.
 200     position begin;
 201     /// End of the located region.
 202     position end;
 203   };
 204
 205   /// Join two location objects to create a location.
 206   inline const location operator+ (const location& begin, const location& end)
 207   {
 208     location res = begin;
 209     res.end = end.end;
 210     return res;
 211   }
 212
 213   /// Add two location objects.
 214   inline const location operator+ (const location& begin, unsigned int width)
 215   {
 216     location res = begin;
 217     res.columns (width);
 218     return res;
 219   }
 220
 221   /// Add and assign a location.
 222   inline location& operator+= (location& res, unsigned int width)
 223   {
 224     res.columns (width);
 225     return res;
 226   }
 227
 228   /** \brief Intercept output stream redirection.
 229    ** \param ostr the destination output stream
 230    ** \param loc a reference to the location to redirect
 231    **
 232    ** Avoid duplicate information.
 233    */
 234   inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
 235   {
 236     position last = loc.end - 1;
 237     ostr << loc.begin;
 238     if (last.filename
 239         && (!loc.begin.filename
 240             || *loc.begin.filename != *last.filename))
 241       ostr << '-' << last;
 242     else if (loc.begin.line != last.line)
 243       ostr << '-' << last.line  << '.' << last.column;
 244     else if (loc.begin.column != last.column)
 245       ostr << '-' << last.column;
 246     return ostr;
 247   }
 248
 249 }
 250
 251 #endif // not BISON_LOCATION_HH]
 252 m4_divert(-1)
 253 m4_changecom([#])