data/glr.cc

   1 # C++ GLR 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
  19 # This skeleton produces a C++ class that encapsulates a C glr parser.
  20 # This is in order to reduce the maintenance burden.  The glr.c
  21 # skeleton is clean and pure enough so that there are no real
  22 # problems.  The C++ interface is the same as that of lalr1.cc.  In
  23 # fact, glr.c can replace yacc.c without the user noticing any
  24 # difference, and similarly for glr.cc replacing lalr1.cc.
  25 #
  26 # The passing of parse-params
  27 #
  28 #   The additional arguments are stored as members of the parser
  29 #   object, yyparser.  The C routines need to carry yyparser
  30 #   throughout the C parser; that's easy: make yyparser an
  31 #   additional parse-param.  But because the C++ skeleton needs to
  32 #   know the "real" original parse-param, we save them
  33 #   (b4_parse_param_orig).  Note that b4_parse_param is overquoted
  34 #   (and c.m4 strips one level of quotes).  This is a PITA, and
  35 #   explains why there are so many levels of quotes.
  36 #
  37 # The locations
  38 #
  39 #   We use location.cc just like lalr1.cc, but because glr.c stores
  40 #   the locations in a union, the position and location classes
  41 #   must not have a constructor.  Therefore, contrary to lalr1.cc, we
  42 #   must not define "b4_location_constructors".  As a consequence the
  43 #   user must initialize the first positions (in particular the
  44 #   filename member).
  45
  46 # We require a pure interface using locations.
  47 m4_define([b4_percent_define(locations)], [])
  48 m4_define([b4_pure_flag],      [1])
  49
  50 # The header is mandatory.
  51 b4_defines_if([],
  52               [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
  53
  54 m4_include(b4_pkgdatadir/[c++.m4])
  55 b4_percent_define_ifdef([[location_type]], [],
  56                         [m4_include(b4_pkgdatadir/[location.cc])])
  57
  58 m4_define([b4_parser_class_name],
  59           [b4_percent_define_get([[parser_class_name]])])
  60
  61 # Save the parse parameters.
  62 m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
  63
  64
  65 # b4_yy_symbol_print_generate
  66 # ---------------------------
  67 # Bypass the default implementation to generate the "yy_symbol_print"
  68 # and "yy_symbol_value_print" functions.
  69 m4_define([b4_yy_symbol_print_generate],
  70 [[
  71 /*--------------------.
  72 | Print this symbol.  |
  73 `--------------------*/
  74
  75 ]b4_c_ansi_function_def([yy_symbol_print],
  76     [static void],
  77     [[FILE *],               []],
  78     [[int yytype],           [yytype]],
  79     [[const b4_namespace_ref::b4_parser_class_name::semantic_type *yyvaluep],
  80                              [yyvaluep]],
  81     [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp],
  82                              [yylocationp]],
  83     b4_parse_param)[
  84 {
  85 ]b4_parse_param_use[]dnl
  86 [  yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
  87 }
  88 ]])
  89
  90
  91 # Declare yyerror.
  92 m4_append([b4_post_prologue],
  93 [b4_syncline([@oline@], [@ofile@])
  94
  95 b4_c_ansi_function_decl([yyerror],
  96     [static void],
  97     [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
  98     b4_parse_param,
  99     [[const char* msg], [msg]])])
 100
 101
 102 # Define yyerror.
 103 m4_append([b4_epilogue],
 104 [b4_syncline([@oline@], [@ofile@])[
 105 /*------------------.
 106 | Report an error.  |
 107 `------------------*/
 108
 109 ]b4_c_ansi_function_def([yyerror],
 110     [static void],
 111     [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
 112     b4_parse_param,
 113     [[const char* msg], [msg]])[
 114 {
 115 ]b4_parse_param_use[]dnl
 116 [  yyparser.error (*yylocationp, msg);
 117 }
 118
 119
 120 ]b4_namespace_open[
 121 ]dnl In this section, the parse param are the original parse_params.
 122 m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 123 [  /// Build a parser object.
 124   ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
 125     :])[
 126 #if YYDEBUG
 127     ]m4_ifset([b4_parse_param], [  ], [ :])[yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
 128 #endif]b4_parse_param_cons[
 129   {
 130   }
 131
 132   ]b4_parser_class_name::~b4_parser_class_name[ ()
 133   {
 134   }
 135
 136   int
 137   ]b4_parser_class_name[::parse ()
 138   {
 139     return ::yyparse (*this]b4_user_args[);
 140   }
 141
 142 #if YYDEBUG
 143   /*--------------------.
 144   | Print this symbol.  |
 145   `--------------------*/
 146
 147   inline void
 148   ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
 149                            const semantic_type* yyvaluep, const location_type* yylocationp)
 150   {
 151     YYUSE (yylocationp);
 152     YYUSE (yyvaluep);
 153     std::ostream& yyoutput = debug_stream ();
 154     std::ostream& yyo = yyoutput;
 155     YYUSE (yyo);
 156     switch (yytype)
 157       {
 158 ]b4_symbol_foreach([b4_symbol_printer])dnl
 159 [        default:
 160           break;
 161       }
 162   }
 163
 164
 165   void
 166   ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
 167                            const semantic_type* yyvaluep, const location_type* yylocationp)
 168   {
 169     *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
 170                << ' ' << yytname[yytype] << " ("
 171                << *yylocationp << ": ";
 172     yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
 173     *yycdebug_ << ')';
 174   }
 175
 176   std::ostream&
 177   ]b4_parser_class_name[::debug_stream () const
 178   {
 179     return *yycdebug_;
 180   }
 181
 182   void
 183   ]b4_parser_class_name[::set_debug_stream (std::ostream& o)
 184   {
 185     yycdebug_ = &o;
 186   }
 187
 188
 189   ]b4_parser_class_name[::debug_level_type
 190   ]b4_parser_class_name[::debug_level () const
 191   {
 192     return yydebug;
 193   }
 194
 195   void
 196   ]b4_parser_class_name[::set_debug_level (debug_level_type l)
 197   {
 198     yydebug = l;
 199   }
 200
 201 #endif
 202 ]m4_popdef([b4_parse_param])dnl
 203 b4_namespace_close[
 204 ]])
 205
 206
 207 # Let glr.c believe that the user arguments include the parser itself.
 208 m4_ifset([b4_parse_param],
 209 [m4_pushdef([b4_parse_param],
 210             m4_dquote([[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]],]
 211 m4_defn([b4_parse_param])))],
 212 [m4_pushdef([b4_parse_param],
 213             [[[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]]]])
 214 ])
 215 m4_include(b4_pkgdatadir/[glr.c])
 216 m4_popdef([b4_parse_param])
 217
 218 m4_divert_push(0)
 219 @output(b4_spec_defines_file@)@
 220 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
 221              [2002-2012])[
 222
 223 /* C++ GLR parser skeleton written by Akim Demaille.  */
 224
 225 #ifndef PARSER_HEADER_H
 226 # define PARSER_HEADER_H
 227
 228 ]b4_percent_code_get([[requires]])[
 229
 230 #include <stdexcept>
 231 #include <string>
 232 #include <iostream>
 233 ]b4_percent_define_ifdef([[location_type]], [],
 234                          [[#include "location.hh"]])[
 235
 236 /* Using locations.  */
 237 #define YYLSP_NEEDED ]b4_locations_if([1], [0])[
 238
 239 /* Enabling traces.  */
 240 #ifndef YYDEBUG
 241 # define YYDEBUG ]b4_parse_trace_if([1], [0])[
 242 #endif
 243
 244 /* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
 245    If N is 0, then set CURRENT to the empty location which ends
 246    the previous symbol: RHS[0] (always defined).  */
 247
 248 #ifndef YYLLOC_DEFAULT
 249 # define YYLLOC_DEFAULT(Current, Rhs, N)                                \
 250     do                                                                  \
 251       if (N)                                                            \
 252         {                                                               \
 253           (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
 254           (Current).end    = YYRHSLOC (Rhs, N).end;                     \
 255         }                                                               \
 256       else                                                              \
 257         {                                                               \
 258           (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
 259         }                                                               \
 260     while (/*CONSTCOND*/ 0)
 261 #endif
 262
 263 ]b4_namespace_open[
 264   /// A Bison parser.
 265   class ]b4_parser_class_name[
 266   {
 267   public:
 268 ]b4_public_types_declare[
 269
 270     /// Build a parser object.
 271     ]b4_parser_class_name[ (]b4_parse_param_decl[);
 272     virtual ~]b4_parser_class_name[ ();
 273
 274     /// Parse.
 275     /// \returns  0 iff parsing succeeded.
 276     virtual int parse ();
 277
 278     /// The current debugging stream.
 279     std::ostream& debug_stream () const;
 280     /// Set the current debugging stream.
 281     void set_debug_stream (std::ostream &);
 282
 283     /// Type for debugging levels.
 284     typedef int debug_level_type;
 285     /// The current debugging level.
 286     debug_level_type debug_level () const;
 287     /// Set the current debugging level.
 288     void set_debug_level (debug_level_type l);
 289
 290   public:
 291     /// Report a syntax error.
 292     /// \param loc    where the syntax error is found.
 293     /// \param msg    a description of the syntax error.
 294     virtual void error (const location_type& loc, const std::string& msg);
 295
 296 #if YYDEBUG
 297   public:
 298     /// \brief Report a symbol value on the debug stream.
 299     /// \param yytype       The token type.
 300     /// \param yyvaluep     Its semantic value.
 301     /// \param yylocationp  Its location.
 302     virtual void yy_symbol_value_print_ (int yytype,
 303                                          const semantic_type* yyvaluep,
 304                                          const location_type* yylocationp);
 305     /// \brief Report a symbol on the debug stream.
 306     /// \param yytype       The token type.
 307     /// \param yyvaluep     Its semantic value.
 308     /// \param yylocationp  Its location.
 309     virtual void yy_symbol_print_ (int yytype,
 310                                    const semantic_type* yyvaluep,
 311                                    const location_type* yylocationp);
 312   private:
 313     /* Debugging.  */
 314     std::ostream* yycdebug_;
 315 #endif
 316
 317     /// \brief Reclaim the memory associated to a symbol.
 318     /// \param yymsg        Why this token is reclaimed.
 319     /// \param yytype       The symbol type.
 320     /// \param yyvaluep     Its semantic value.
 321     /// \param yylocationp  Its location.
 322     inline void yydestruct_ (const char* yymsg,
 323                              int yytype,
 324                              semantic_type* yyvaluep,
 325                              location_type* yylocationp);
 326
 327 ]b4_parse_param_vars[
 328   };
 329
 330 ]dnl Redirections for glr.c.
 331 b4_percent_define_flag_if([[global_tokens_and_yystype]],
 332 [b4_token_defines(b4_tokens)])
 333 [
 334 #ifndef YYSTYPE
 335 # define YYSTYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
 336 #endif
 337 #ifndef YYLTYPE
 338 # define YYLTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
 339 #endif
 340
 341 ]b4_namespace_close[
 342
 343 ]b4_percent_code_get([[provides]])[]dnl
 344
 345 [#endif /* ! defined PARSER_HEADER_H */]
 346 m4_divert_pop(0)