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| 1 -*- C -*- |
| 2 |
| 3 # C++ GLR skeleton for Bison |
| 4 # Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, |
| 5 # 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 3 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, see <http://www.gnu.org/licenses/>. |
| 19 |
| 20 |
| 21 # This skeleton produces a C++ class that encapsulates a C glr parser. |
| 22 # This is in order to reduce the maintenance burden. The glr.c |
| 23 # skeleton is clean and pure enough so that there are no real |
| 24 # problems. The C++ interface is the same as that of lalr1.cc. In |
| 25 # fact, glr.c can replace yacc.c without the user noticing any |
| 26 # difference, and similarly for glr.cc replacing lalr1.cc. |
| 27 # |
| 28 # The passing of parse-params |
| 29 # |
| 30 # The additional arguments are stored as members of the parser |
| 31 # object, yyparser. The C routines need to carry yyparser |
| 32 # throughout the C parser; that easy: just let yyparser become an |
| 33 # additional parse-param. But because the C++ skeleton needs to |
| 34 # know the "real" original parse-param, we save them |
| 35 # (b4_parse_param_orig). Note that b4_parse_param is overquoted |
| 36 # (and c.m4 strips one level of quotes). This is a PITA, and |
| 37 # explains why there are so many levels of quotes. |
| 38 # |
| 39 # The locations |
| 40 # |
| 41 # We use location.cc just like lalr1.cc, but because glr.c stores |
| 42 # the locations in a (C++) union, the position and location classes |
| 43 # must not have a constructor. Therefore, contrary to lalr1.cc, we |
| 44 # must not define "b4_location_constructors". As a consequence the |
| 45 # user must initialize the first positions (in particular the |
| 46 # filename member). |
| 47 |
| 48 # We require a pure interface using locations. |
| 49 m4_define([b4_locations_flag], [1]) |
| 50 m4_define([b4_pure_flag], [1]) |
| 51 |
| 52 # The header is mandatory. |
| 53 b4_defines_if([], |
| 54 [b4_fatal([b4_skeleton[: using %%defines is mandatory]])]) |
| 55 |
| 56 m4_include(b4_pkgdatadir/[c++.m4]) |
| 57 m4_include(b4_pkgdatadir/[location.cc]) |
| 58 |
| 59 m4_define([b4_parser_class_name], |
| 60 [b4_percent_define_get([[parser_class_name]])]) |
| 61 |
| 62 # Save the parse parameters. |
| 63 m4_define([b4_parse_param_orig], m4_defn([b4_parse_param])) |
| 64 |
| 65 |
| 66 # b4_yy_symbol_print_generate |
| 67 # --------------------------- |
| 68 # Bypass the default implementation to generate the "yy_symbol_print" |
| 69 # and "yy_symbol_value_print" functions. |
| 70 m4_define([b4_yy_symbol_print_generate], |
| 71 [[ |
| 72 /*--------------------. |
| 73 | Print this symbol. | |
| 74 `--------------------*/ |
| 75 |
| 76 ]b4_c_ansi_function_def([yy_symbol_print], |
| 77 [static void], |
| 78 [[FILE *], []], |
| 79 [[int yytype], [yytype]], |
| 80 [[const b4_namespace_ref::b4_parser_class_name::semantic_type *yyvaluep], |
| 81 [yyvaluep]], |
| 82 [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], |
| 83 [yylocationp]], |
| 84 b4_parse_param)[ |
| 85 { |
| 86 ]b4_parse_param_use[]dnl |
| 87 [ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[
); |
| 88 } |
| 89 ]]) |
| 90 |
| 91 |
| 92 # Declare yyerror. |
| 93 m4_append([b4_post_prologue], |
| 94 [b4_syncline([@oline@], [@ofile@]) |
| 95 |
| 96 b4_c_ansi_function_decl([yyerror], |
| 97 [static void], |
| 98 [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylo
cationp]], |
| 99 b4_parse_param, |
| 100 [[const char* msg], [msg]])]) |
| 101 |
| 102 |
| 103 # Define yyerror. |
| 104 m4_append([b4_epilogue], |
| 105 [b4_syncline([@oline@], [@ofile@])[ |
| 106 /*------------------. |
| 107 | Report an error. | |
| 108 `------------------*/ |
| 109 |
| 110 ]b4_c_ansi_function_def([yyerror], |
| 111 [static void], |
| 112 [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylo
cationp]], |
| 113 b4_parse_param, |
| 114 [[const char* msg], [msg]])[ |
| 115 { |
| 116 ]b4_parse_param_use[]dnl |
| 117 [ yyparser.error (*yylocationp, msg); |
| 118 } |
| 119 |
| 120 |
| 121 ]b4_namespace_open[ |
| 122 ]dnl In this section, the parse param are the original parse_params. |
| 123 m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl |
| 124 [ /// Build a parser object. |
| 125 ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset(
[b4_parse_param], [ |
| 126 :])[ |
| 127 #if YYDEBUG |
| 128 ]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false), |
| 129 yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[ |
| 130 #endif]b4_parse_param_cons[ |
| 131 { |
| 132 } |
| 133 |
| 134 ]b4_parser_class_name::~b4_parser_class_name[ () |
| 135 { |
| 136 } |
| 137 |
| 138 int |
| 139 ]b4_parser_class_name[::parse () |
| 140 { |
| 141 return ::yyparse (*this]b4_user_args[); |
| 142 } |
| 143 |
| 144 #if YYDEBUG |
| 145 /*--------------------. |
| 146 | Print this symbol. | |
| 147 `--------------------*/ |
| 148 |
| 149 inline void |
| 150 ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype, |
| 151 const semantic_type* yyvaluep, const location_type* y
ylocationp) |
| 152 { |
| 153 /* Pacify ``unused variable'' warnings. */ |
| 154 YYUSE (yyvaluep); |
| 155 YYUSE (yylocationp); |
| 156 switch (yytype) |
| 157 { |
| 158 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))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* y
ylocationp) |
| 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 |
| 208 # Let glr.c believe that the user arguments include the parser itself. |
| 209 m4_ifset([b4_parse_param], |
| 210 [m4_pushdef([b4_parse_param], |
| 211 m4_dquote([[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yy
parser]]],] |
| 212 m4_defn([b4_parse_param])))], |
| 213 [m4_pushdef([b4_parse_param], |
| 214 [[[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]]
]]) |
| 215 ]) |
| 216 m4_include(b4_pkgdatadir/[glr.c]) |
| 217 m4_popdef([b4_parse_param]) |
| 218 |
| 219 m4_divert_push(0) |
| 220 @output(b4_spec_defines_file@) |
| 221 b4_copyright([Skeleton interface for Bison GLR parsers in C++], |
| 222 [2002, 2003, 2004, 2005, 2006])[ |
| 223 |
| 224 /* C++ GLR parser skeleton written by Akim Demaille. */ |
| 225 |
| 226 #ifndef PARSER_HEADER_H |
| 227 # define PARSER_HEADER_H |
| 228 |
| 229 ]b4_percent_code_get([[requires]])[ |
| 230 |
| 231 #include <string> |
| 232 #include <iostream> |
| 233 |
| 234 /* Using locations. */ |
| 235 #define YYLSP_NEEDED ]b4_locations_flag[ |
| 236 |
| 237 ]b4_namespace_open[ |
| 238 class position; |
| 239 class location; |
| 240 ]b4_namespace_close[ |
| 241 |
| 242 #include "location.hh" |
| 243 |
| 244 /* Enabling traces. */ |
| 245 #ifndef YYDEBUG |
| 246 # define YYDEBUG ]b4_debug_flag[ |
| 247 #endif |
| 248 |
| 249 /* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N]. |
| 250 If N is 0, then set CURRENT to the empty location which ends |
| 251 the previous symbol: RHS[0] (always defined). */ |
| 252 |
| 253 #ifndef YYLLOC_DEFAULT |
| 254 # define YYLLOC_DEFAULT(Current, Rhs, N) \ |
| 255 do \ |
| 256 if (N) \ |
| 257 { \ |
| 258 (Current).begin = YYRHSLOC (Rhs, 1).begin; \ |
| 259 (Current).end = YYRHSLOC (Rhs, N).end; \ |
| 260 } \ |
| 261 else \ |
| 262 { \ |
| 263 (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \ |
| 264 } \ |
| 265 while (/*CONSTCOND*/ 0) |
| 266 #endif |
| 267 |
| 268 ]b4_namespace_open[ |
| 269 /// A Bison parser. |
| 270 class ]b4_parser_class_name[ |
| 271 { |
| 272 public: |
| 273 /// Symbol semantic values. |
| 274 #ifndef YYSTYPE |
| 275 ]m4_ifdef([b4_stype], |
| 276 [ union semantic_type |
| 277 { |
| 278 b4_user_stype |
| 279 };], |
| 280 [m4_if(b4_tag_seen_flag, 0, |
| 281 [[ typedef int semantic_type;]], |
| 282 [[ typedef YYSTYPE semantic_type;]])])[ |
| 283 #else |
| 284 typedef YYSTYPE semantic_type; |
| 285 #endif |
| 286 /// Symbol locations. |
| 287 typedef ]b4_percent_define_get([[location_type]])[ location_type; |
| 288 /// Tokens. |
| 289 struct token |
| 290 { |
| 291 ]b4_token_enums(b4_tokens)[ |
| 292 }; |
| 293 /// Token type. |
| 294 typedef token::yytokentype token_type; |
| 295 |
| 296 /// Build a parser object. |
| 297 ]b4_parser_class_name[ (]b4_parse_param_decl[); |
| 298 virtual ~]b4_parser_class_name[ (); |
| 299 |
| 300 /// Parse. |
| 301 /// \returns 0 iff parsing succeeded. |
| 302 virtual int parse (); |
| 303 |
| 304 /// The current debugging stream. |
| 305 std::ostream& debug_stream () const; |
| 306 /// Set the current debugging stream. |
| 307 void set_debug_stream (std::ostream &); |
| 308 |
| 309 /// Type for debugging levels. |
| 310 typedef int debug_level_type; |
| 311 /// The current debugging level. |
| 312 debug_level_type debug_level () const; |
| 313 /// Set the current debugging level. |
| 314 void set_debug_level (debug_level_type l); |
| 315 |
| 316 private: |
| 317 |
| 318 public: |
| 319 /// Report a syntax error. |
| 320 /// \param loc where the syntax error is found. |
| 321 /// \param msg a description of the syntax error. |
| 322 virtual void error (const location_type& loc, const std::string& msg); |
| 323 private: |
| 324 |
| 325 #if YYDEBUG |
| 326 public: |
| 327 /// \brief Report a symbol value on the debug stream. |
| 328 /// \param yytype The token type. |
| 329 /// \param yyvaluep Its semantic value. |
| 330 /// \param yylocationp Its location. |
| 331 virtual void yy_symbol_value_print_ (int yytype, |
| 332 const semantic_type* yyvaluep, |
| 333 const location_type* yylocationp); |
| 334 /// \brief Report a symbol on the debug stream. |
| 335 /// \param yytype The token type. |
| 336 /// \param yyvaluep Its semantic value. |
| 337 /// \param yylocationp Its location. |
| 338 virtual void yy_symbol_print_ (int yytype, |
| 339 const semantic_type* yyvaluep, |
| 340 const location_type* yylocationp); |
| 341 private: |
| 342 /* Debugging. */ |
| 343 int yydebug_; |
| 344 std::ostream* yycdebug_; |
| 345 #endif |
| 346 |
| 347 |
| 348 /// \brief Reclaim the memory associated to a symbol. |
| 349 /// \param yymsg Why this token is reclaimed. |
| 350 /// \param yytype The symbol type. |
| 351 /// \param yyvaluep Its semantic value. |
| 352 /// \param yylocationp Its location. |
| 353 inline void yydestruct_ (const char* yymsg, |
| 354 int yytype, |
| 355 semantic_type* yyvaluep, |
| 356 location_type* yylocationp); |
| 357 |
| 358 ]b4_parse_param_vars[ |
| 359 }; |
| 360 |
| 361 ]dnl Redirections for glr.c. |
| 362 b4_percent_define_flag_if([[global_tokens_and_yystype]], |
| 363 [b4_token_defines(b4_tokens)]) |
| 364 [ |
| 365 #ifndef YYSTYPE |
| 366 # define YYSTYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type |
| 367 #endif |
| 368 #ifndef YYLTYPE |
| 369 # define YYLTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type |
| 370 #endif |
| 371 |
| 372 ]b4_namespace_close[ |
| 373 |
| 374 ]b4_percent_code_get([[provides]])[]dnl |
| 375 |
| 376 [#endif /* ! defined PARSER_HEADER_H */] |
| 377 m4_divert_pop(0) |
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