data/location.cc

   1 # C++ skeleton for Bison
   2
   3 # Copyright (C) 2002-2012 Free Software Foundation, Inc.
   4
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 m4_pushdef([b4_copyright_years],
  19            [2002-2012])
  20
  21 # b4_position_define
  22 # ------------------
  23 # Define class position.
  24 m4_define([b4_position_define],
  25 [[  /// Abstract a position.
  26   class position
  27   {
  28   public:
  29 ]m4_ifdef([b4_location_constructors], [[
  30     /// Construct a position.
  31     explicit position (]b4_percent_define_get([[filename_type]])[* f = YY_NULL,
  32                        unsigned int l = ]b4_location_initial_line[u,
  33                        unsigned int c = ]b4_location_initial_column[u)
  34       : filename (f)
  35       , line (l)
  36       , column (c)
  37     {
  38     }
  39
  40 ]])[
  41     /// Initialization.
  42     void initialize (]b4_percent_define_get([[filename_type]])[* fn = YY_NULL,
  43                      unsigned int l = ]b4_location_initial_line[u,
  44                      unsigned int c = ]b4_location_initial_column[u)
  45     {
  46       filename = fn;
  47       line = l;
  48       column = c;
  49     }
  50
  51     /** \name Line and Column related manipulators
  52      ** \{ */
  53     /// (line related) Advance to the COUNT next lines.
  54     void lines (int count = 1)
  55     {
  56       column = ]b4_location_initial_column[u;
  57       line += count;
  58     }
  59
  60     /// (column related) Advance to the COUNT next columns.
  61     void columns (int count = 1)
  62     {
  63       column = std::max (]b4_location_initial_column[u, column + count);
  64     }
  65     /** \} */
  66
  67     /// File name to which this position refers.
  68     ]b4_percent_define_get([[filename_type]])[* filename;
  69     /// Current line number.
  70     unsigned int line;
  71     /// Current column number.
  72     unsigned int column;
  73   };
  74
  75   /// Add and assign a position.
  76   inline const position&
  77   operator+= (position& res, const int width)
  78   {
  79     res.columns (width);
  80     return res;
  81   }
  82
  83   /// Add two position objects.
  84   inline const position
  85   operator+ (const position& begin, const int width)
  86   {
  87     position res = begin;
  88     return res += width;
  89   }
  90
  91   /// Add and assign a position.
  92   inline const position&
  93   operator-= (position& res, const int width)
  94   {
  95     return res += -width;
  96   }
  97
  98   /// Add two position objects.
  99   inline const position
 100   operator- (const position& begin, const int width)
 101   {
 102     return begin + -width;
 103   }
 104 ]b4_percent_define_flag_if([[define_location_comparison]], [[
 105   /// Compare two position objects.
 106   inline bool
 107   operator== (const position& pos1, const position& pos2)
 108   {
 109     return (pos1.line == pos2.line
 110             && pos1.column == pos2.column
 111             && (pos1.filename == pos2.filename
 112                 || (pos1.filename && pos2.filename
 113                     && *pos1.filename == *pos2.filename)));
 114   }
 115
 116   /// Compare two position objects.
 117   inline bool
 118   operator!= (const position& pos1, const position& pos2)
 119   {
 120     return !(pos1 == pos2);
 121   }
 122 ]])[
 123   /** \brief Intercept output stream redirection.
 124    ** \param ostr the destination output stream
 125    ** \param pos a reference to the position to redirect
 126    */
 127   inline std::ostream&
 128   operator<< (std::ostream& ostr, const position& pos)
 129   {
 130     if (pos.filename)
 131       ostr << *pos.filename << ':';
 132     return ostr << pos.line << '.' << pos.column;
 133   }
 134 ]])
 135
 136
 137 # b4_location_define
 138 # ------------------
 139 m4_define([b4_location_define],
 140 [[  /// Abstract a location.
 141   class location
 142   {
 143   public:
 144 ]m4_ifdef([b4_location_constructors], [
 145     /// Construct a location from \a b to \a e.
 146     location (const position& b, const position& e)
 147       : begin (b)
 148       , end (e)
 149     {
 150     }
 151
 152     /// Construct a 0-width location in \a p.
 153     explicit location (const position& p = position ())
 154       : begin (p)
 155       , end (p)
 156     {
 157     }
 158
 159     /// Construct a 0-width location in \a f, \a l, \a c.
 160     explicit location (]b4_percent_define_get([[filename_type]])[* f,
 161                        unsigned int l = ]b4_location_initial_line[u,
 162                        unsigned int c = ]b4_location_initial_column[u)
 163       : begin (f, l, c)
 164       , end (f, l, c)
 165     {
 166     }
 167
 168 ])[
 169     /// Initialization.
 170     void initialize (]b4_percent_define_get([[filename_type]])[* f = YY_NULL,
 171                      unsigned int l = ]b4_location_initial_line[u,
 172                      unsigned int c = ]b4_location_initial_column[u)
 173     {
 174       begin.initialize (f, l, c);
 175       end = begin;
 176     }
 177
 178     /** \name Line and Column related manipulators
 179      ** \{ */
 180   public:
 181     /// Reset initial location to final location.
 182     void step ()
 183     {
 184       begin = end;
 185     }
 186
 187     /// Extend the current location to the COUNT next columns.
 188     void columns (unsigned int count = 1)
 189     {
 190       end += count;
 191     }
 192
 193     /// Extend the current location to the COUNT next lines.
 194     void lines (unsigned int count = 1)
 195     {
 196       end.lines (count);
 197     }
 198     /** \} */
 199
 200
 201   public:
 202     /// Beginning of the located region.
 203     position begin;
 204     /// End of the located region.
 205     position end;
 206   };
 207
 208   /// Join two location objects to create a location.
 209   inline const location operator+ (const location& begin, const location& end)
 210   {
 211     location res = begin;
 212     res.end = end.end;
 213     return res;
 214   }
 215
 216   /// Add two location objects.
 217   inline const location operator+ (const location& begin, unsigned int width)
 218   {
 219     location res = begin;
 220     res.columns (width);
 221     return res;
 222   }
 223
 224   /// Add and assign a location.
 225   inline location& operator+= (location& res, unsigned int width)
 226   {
 227     res.columns (width);
 228     return res;
 229   }
 230 ]b4_percent_define_flag_if([[define_location_comparison]], [[
 231   /// Compare two location objects.
 232   inline bool
 233   operator== (const location& loc1, const location& loc2)
 234   {
 235     return loc1.begin == loc2.begin && loc1.end == loc2.end;
 236   }
 237
 238   /// Compare two location objects.
 239   inline bool
 240   operator!= (const location& loc1, const location& loc2)
 241   {
 242     return !(loc1 == loc2);
 243   }
 244 ]])[
 245   /** \brief Intercept output stream redirection.
 246    ** \param ostr the destination output stream
 247    ** \param loc a reference to the location to redirect
 248    **
 249    ** Avoid duplicate information.
 250    */
 251   inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
 252   {
 253     position last = loc.end - 1;
 254     ostr << loc.begin;
 255     if (last.filename
 256         && (!loc.begin.filename
 257             || *loc.begin.filename != *last.filename))
 258       ostr << '-' << last;
 259     else if (loc.begin.line != last.line)
 260       ostr << '-' << last.line  << '.' << last.column;
 261     else if (loc.begin.column != last.column)
 262       ostr << '-' << last.column;
 263     return ostr;
 264   }
 265 ]])
 266
 267
 268 # We do want M4 expansion after # for CPP macros.
 269 m4_changecom()
 270 b4_defines_if([
 271 m4_divert_push(0)dnl
 272 @output(b4_dir_prefix[]position.hh@)@
 273 b4_copyright([Positions for Bison parsers in C++])[
 274
 275 /**
 276  ** \file ]b4_dir_prefix[position.hh
 277  ** Define the ]b4_namespace_ref[::position class.
 278  */
 279
 280 ]b4_cpp_guard_open([b4_dir_prefix[]position.hh])[
 281
 282 # include <algorithm> // std::max
 283 # include <iosfwd>
 284 # include <string>
 285
 286 ]b4_null_define[
 287
 288 ]b4_namespace_open[
 289 ]b4_position_define[
 290 ]b4_namespace_close[
 291 ]b4_cpp_guard_close([b4_dir_prefix[]position.hh])
 292 @output(b4_dir_prefix[]location.hh@)@
 293 b4_copyright([Locations for Bison parsers in C++])[
 294
 295 /**
 296  ** \file ]b4_dir_prefix[location.hh
 297  ** Define the ]b4_namespace_ref[::location class.
 298  */
 299
 300 ]b4_cpp_guard_open([b4_dir_prefix[]location.hh])[
 301
 302 # include <iostream>
 303 # include <string>
 304 # include "position.hh"
 305
 306 ]b4_namespace_open[
 307 ]b4_location_define[
 308 ]b4_namespace_close[
 309 ]b4_cpp_guard_close([b4_dir_prefix[]location.hh])
 310 m4_divert_pop(0)
 311 ])# b4_defines_if
 312 m4_popdef([b4_copyright_years])dnl
 313 m4_changecom([#])