data/lalr1.cc

   1 m4_divert(-1)
   2 # C++ skeleton for Bison
   3 # Copyright (C) 2002, 2003, 2004 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 2 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, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18 # 02111-1307  USA
  19
  20 ## ---------------- ##
  21 ## Default values.  ##
  22 ## ---------------- ##
  23
  24 # Default Parser class name.
  25 m4_define_default([b4_parser_class_name], [Parser])
  26
  27
  28
  29 ## ----------------- ##
  30 ## Semantic Values.  ##
  31 ## ----------------- ##
  32
  33
  34 # b4_lhs_value([TYPE])
  35 # --------------------
  36 # Expansion of $<TYPE>$.
  37 m4_define([b4_lhs_value],
  38 [yyval[]m4_ifval([$1], [.$1])])
  39
  40
  41 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
  42 # --------------------------------------
  43 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
  44 # symbols on RHS.
  45 m4_define([b4_rhs_value],
  46 [semantic_stack_@{m4_eval([$1 - $2])@}m4_ifval([$3], [.$3])])
  47
  48 m4_define_default([b4_location_type], [Location])
  49
  50 # b4_lhs_location()
  51 # -----------------
  52 # Expansion of @$.
  53 m4_define([b4_lhs_location],
  54 [yyloc])
  55
  56
  57 # b4_rhs_location(RULE-LENGTH, NUM)
  58 # ---------------------------------
  59 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols
  60 # on RHS.
  61 m4_define([b4_rhs_location],
  62 [location_stack_@{m4_eval([$1 - $2])@}])
  63
  64
  65 m4_define([b4_inherit],
  66           [m4_ifdef([b4_root],
  67                     [: public b4_root
  68 ],
  69                     [])])
  70
  71 m4_define([b4_param],
  72           [m4_ifdef([b4_root],
  73                     [,
  74             const Param& param],
  75                     [])])
  76
  77 m4_define([b4_constructor],
  78           [m4_ifdef([b4_root],
  79                     [b4_root (param),
  80       ],
  81                     [])])
  82
  83
  84 # b4_parse_param_decl
  85 # -------------------
  86 #  Constructor's extra arguments.
  87 m4_define([b4_parse_param_decl],
  88           [m4_ifset([b4_parse_param], [, b4_c_ansi_formals(b4_parse_param)])])
  89
  90 # b4_parse_param_cons
  91 # -------------------
  92 #  constructor's extra initialisations.
  93 m4_define([b4_parse_param_cons],
  94           [m4_ifset([b4_parse_param],
  95                     [,
  96       b4_cc_constructor_calls(b4_parse_param)])])
  97 m4_define([b4_cc_constructor_calls],
  98           [m4_map_sep([b4_cc_constructor_call], [,
  99       ], [$@])])
 100 m4_define([b4_cc_constructor_call],
 101           [$2($2)])
 102
 103 # b4_parse_param_vars
 104 # -------------------
 105 #  Extra instance variables.
 106 m4_define([b4_parse_param_vars],
 107           [m4_ifset([b4_parse_param],
 108                     [
 109     /* User arguments.  */
 110 b4_cc_var_decls(b4_parse_param)])])
 111 m4_define([b4_cc_var_decls],
 112           [m4_map_sep([b4_cc_var_decl], [
 113 ], [$@])])
 114 m4_define([b4_cc_var_decl],
 115           [    $1;])
 116
 117 # b4_cxx_destruct_def(IGNORED-ARGUMENTS)
 118 # --------------------------------------
 119 # Declare the destruct_ method.
 120 m4_define([b4_cxx_destruct_def],
 121 [void
 122 yy::b4_parser_class_name::destruct_ (int yytype, SemanticType *yyvaluep, LocationType *yylocationp)[]dnl
 123 ])
 124
 125 # We do want M4 expansion after # for CPP macros.
 126 m4_changecom()
 127 m4_divert(0)dnl
 128 m4_if(b4_defines_flag, 0, [],
 129 [@output @output_header_name@
 130 b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
 131              [2002, 2003, 2004])[
 132 /* FIXME: This is wrong, we want computed header guards.
 133    I don't know why the macros are missing now. :( */
 134 #ifndef PARSER_HEADER_H
 135 # define PARSER_HEADER_H
 136
 137 #include "stack.hh"
 138 #include "location.hh"
 139
 140 #include <string>
 141 #include <iostream>
 142
 143 /* Using locations.  */
 144 #define YYLSP_NEEDED ]b4_locations_flag[
 145
 146 ]b4_token_defines(b4_tokens)[
 147
 148 /* Copy the first part of user declarations.  */
 149 ]b4_pre_prologue[
 150
 151 ]/* Line __line__ of lalr1.cc.  */
 152 b4_syncline([@oline@], [@ofile@])[
 153
 154 /* Enabling traces.  */
 155 #ifndef YYDEBUG
 156 # define YYDEBUG ]b4_debug[
 157 #endif
 158
 159 /* Enabling verbose error message.  */
 160 #ifndef YYERROR_VERBOSE
 161 # define YYERROR_VERBOSE ]b4_error_verbose[
 162 #endif
 163
 164 #ifndef YYSTYPE
 165 ]m4_ifdef([b4_stype],
 166 [b4_syncline([b4_stype_line], [b4_filename])
 167 typedef union b4_stype yystype;
 168 /* Line __line__ of lalr1.cc.  */
 169 b4_syncline([@oline@], [@ofile@])],
 170 [typedef int yystype;])[
 171 # define YYSTYPE yystype
 172 #endif
 173
 174 /* Copy the second part of user declarations.  */
 175 ]b4_post_prologue[
 176
 177 ]/* Line __line__ of lalr1.cc.  */
 178 b4_syncline([@oline@], [@ofile@])[
 179 #ifndef YYLLOC_DEFAULT
 180 # define YYLLOC_DEFAULT(Current, Rhs, N) \
 181    ((Current).end = Rhs[N].end)
 182 #endif
 183
 184 namespace yy
 185 {
 186   class ]b4_parser_class_name[;
 187
 188   template < typename P >
 189   struct Traits
 190   {
 191   };
 192
 193   template < >
 194   struct Traits< ]b4_parser_class_name[ >
 195   {
 196     typedef ]b4_int_type_for([b4_translate])[ TokenNumberType;
 197     typedef ]b4_int_type_for([b4_rhs])[       RhsNumberType;
 198     typedef int      StateType;
 199     typedef yystype  SemanticType;
 200     typedef ]b4_location_type[ LocationType;
 201   };
 202 }
 203
 204 namespace yy
 205 {
 206   class ]b4_parser_class_name b4_inherit[
 207   {
 208   public:
 209
 210     typedef Traits< ]b4_parser_class_name[ >::TokenNumberType TokenNumberType;
 211     typedef Traits< ]b4_parser_class_name[ >::RhsNumberType   RhsNumberType;
 212     typedef Traits< ]b4_parser_class_name[ >::StateType       StateType;
 213     typedef Traits< ]b4_parser_class_name[ >::SemanticType    SemanticType;
 214     typedef Traits< ]b4_parser_class_name[ >::LocationType    LocationType;
 215
 216     typedef Stack< StateType >    StateStack;
 217     typedef Stack< SemanticType > SemanticStack;
 218     typedef Stack< LocationType > LocationStack;
 219
 220 #if YYLSP_NEEDED
 221     ]b4_parser_class_name[ (bool debug,
 222             LocationType initlocation][]b4_param[]b4_parse_param_decl[) :
 223       ]b4_constructor[][debug_ (debug),
 224       cdebug_ (std::cerr),
 225       initlocation_ (initlocation)]b4_parse_param_cons[
 226 #else
 227     ]b4_parser_class_name[ (bool debug][]b4_param[]b4_parse_param_decl[) :
 228       ]b4_constructor[][debug_ (debug),
 229       cdebug_ (std::cerr)]b4_parse_param_cons[
 230 #endif
 231     {
 232     }
 233
 234     virtual ~]b4_parser_class_name[ ()
 235     {
 236     }
 237
 238     virtual int parse ();
 239
 240   private:
 241
 242     virtual void lex_ ();
 243     virtual void error_ ();
 244     virtual void print_ ();
 245     virtual void report_syntax_error_ ();
 246
 247     /* Stacks.  */
 248     StateStack    state_stack_;
 249     SemanticStack semantic_stack_;
 250     LocationStack location_stack_;
 251
 252     /* Tables.  */
 253     static const ]b4_int_type_for([b4_pact])[ pact_[];
 254     static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ pact_ninf_;
 255     static const ]b4_int_type_for([b4_defact])[ defact_[];
 256     static const ]b4_int_type_for([b4_pgoto])[ pgoto_[];
 257     static const ]b4_int_type_for([b4_defgoto])[ defgoto_[];
 258     static const ]b4_int_type_for([b4_table])[ table_[];
 259     static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ table_ninf_;
 260     static const ]b4_int_type_for([b4_check])[ check_[];
 261     static const ]b4_int_type_for([b4_stos])[ stos_[];
 262     static const ]b4_int_type_for([b4_r1])[ r1_[];
 263     static const ]b4_int_type_for([b4_r2])[ r2_[];
 264
 265 #if YYDEBUG || YYERROR_VERBOSE
 266     static const char* const name_[];
 267 #endif
 268
 269     /* More tables, for debugging.  */
 270 #if YYDEBUG
 271     static const RhsNumberType rhs_[];
 272     static const ]b4_int_type_for([b4_prhs])[ prhs_[];
 273     static const ]b4_int_type_for([b4_rline])[ rline_[];
 274     static const ]b4_int_type_for([b4_toknum])[ token_number_[];
 275     virtual void reduce_print_ (int yyrule);
 276     virtual void stack_print_ ();
 277 #endif
 278
 279     /* Even more tables.  */
 280     static inline TokenNumberType translate_ (int token);
 281     static inline void destruct_ (int yytype, SemanticType *yyvaluep,
 282                                   LocationType *yylocationp);
 283
 284     /* Constants.  */
 285     static const int eof_;
 286     /* LAST_ -- Last index in TABLE_.  */
 287     static const int last_;
 288     static const int nnts_;
 289     static const int empty_;
 290     static const int final_;
 291     static const int terror_;
 292     static const int errcode_;
 293     static const int ntokens_;
 294     static const unsigned int user_token_number_max_;
 295     static const TokenNumberType undef_token_;
 296
 297     /* State.  */
 298     int n_;
 299     int len_;
 300     int state_;
 301
 302     /* Error handling. */
 303     int nerrs_;
 304     int errstatus_;
 305
 306     /* Debugging.  */
 307     int debug_;
 308     std::ostream &cdebug_;
 309
 310     /* Look-ahead and look-ahead in internal form.  */
 311     int looka_;
 312     int ilooka_;
 313
 314     /* Message.  */
 315     std::string message;
 316
 317     /* Semantic value and location of look-ahead token.  */
 318     SemanticType value;
 319     LocationType location;
 320     /* Beginning of the last erroneous token popped off.  */
 321     Position error_start_;
 322
 323     /* @@$ and $$.  */
 324     SemanticType yyval;
 325     LocationType yyloc;
 326
 327     /* Initial location.  */
 328     LocationType initlocation_;
 329 ]b4_parse_param_vars[
 330   };
 331 }
 332
 333 #endif /* ! defined PARSER_HEADER_H */]
 334 ])dnl
 335 @output @output_parser_name@
 336 b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
 337              [2002, 2003, 2004])
 338
 339 m4_if(b4_defines_flag, 0, [], [#include @output_header_name@])[
 340
 341 /* Enable debugging if requested.  */
 342 #if YYDEBUG
 343 # define YYCDEBUG    if (debug_) cdebug_
 344 # define YY_REDUCE_PRINT(Rule)          \
 345 do {                                    \
 346   if (debug_)                           \
 347     reduce_print_ (Rule);               \
 348 } while (0)
 349 # define YY_STACK_PRINT()               \
 350 do {                                    \
 351   if (debug_)                           \
 352     stack_print_ ();                    \
 353 } while (0)
 354 #else /* !YYDEBUG */
 355 # define YYCDEBUG    if (0) cdebug_
 356 # define YY_REDUCE_PRINT(Rule)
 357 # define YY_STACK_PRINT()
 358 #endif /* !YYDEBUG */
 359
 360 #define YYACCEPT        goto yyacceptlab
 361 #define YYABORT         goto yyabortlab
 362 #define YYERROR         goto yyerrorlab
 363
 364 ]b4_yydestruct_generate([b4_cxx_destruct_def])[
 365
 366 int
 367 yy::]b4_parser_class_name[::parse ()
 368 {
 369   nerrs_ = 0;
 370   errstatus_ = 0;
 371
 372   /* Initialize the stacks.  The initial state will be pushed in
 373      yynewstate, since the latter expects the semantical and the
 374      location values to have been already stored, initialize these
 375      stacks with a primary value.  */
 376   state_stack_ = StateStack (0);
 377   semantic_stack_ = SemanticStack (1);
 378   location_stack_ = LocationStack (1);
 379
 380   /* Start.  */
 381   state_ = 0;
 382   looka_ = empty_;
 383 #if YYLSP_NEEDED
 384   location = initlocation_;
 385 #endif
 386   YYCDEBUG << "Starting parse" << std::endl;
 387
 388   /* New state.  */
 389  yynewstate:
 390   state_stack_.push (state_);
 391   YYCDEBUG << "Entering state " << state_ << std::endl;
 392   goto yybackup;
 393
 394   /* Backup.  */
 395  yybackup:
 396
 397   /* Try to take a decision without look-ahead.  */
 398   n_ = pact_[state_];
 399   if (n_ == pact_ninf_)
 400     goto yydefault;
 401
 402   /* Read a look-ahead token.  */
 403   if (looka_ == empty_)
 404     {
 405       YYCDEBUG << "Reading a token: ";
 406       lex_ ();
 407     }
 408
 409   /* Convert token to internal form.  */
 410   if (looka_ <= 0)
 411     {
 412       looka_ = eof_;
 413       ilooka_ = 0;
 414       YYCDEBUG << "Now at end of input." << std::endl;
 415     }
 416   else
 417     {
 418       ilooka_ = translate_ (looka_);
 419 #if YYDEBUG
 420       if (debug_)
 421         {
 422           YYCDEBUG << "Next token is " << looka_
 423                  << " (" << name_[ilooka_];
 424           print_ ();
 425           YYCDEBUG << ')' << std::endl;
 426         }
 427 #endif
 428     }
 429
 430   /* If the proper action on seeing token YYTOKEN is to reduce or to
 431      detect an error, take that action.  */
 432   n_ += ilooka_;
 433   if (n_ < 0 || last_ < n_ || check_[n_] != ilooka_)
 434     goto yydefault;
 435
 436   /* Reduce or error.  */
 437   n_ = table_[n_];
 438   if (n_ < 0)
 439     {
 440       if (n_ == table_ninf_)
 441         goto yyerrlab;
 442       else
 443         {
 444           n_ = -n_;
 445           goto yyreduce;
 446         }
 447     }
 448   else if (n_ == 0)
 449     goto yyerrlab;
 450
 451   /* Accept?  */
 452   if (n_ == final_)
 453     goto yyacceptlab;
 454
 455   /* Shift the look-ahead token.  */
 456 #if YYDEBUG
 457   YYCDEBUG << "Shifting token " << looka_
 458            << " (" << name_[ilooka_] << "), ";
 459 #endif
 460
 461   /* Discard the token being shifted unless it is eof.  */
 462   if (looka_ != eof_)
 463     looka_ = empty_;
 464
 465   semantic_stack_.push (value);
 466   location_stack_.push (location);
 467
 468   /* Count tokens shifted since error; after three, turn off error
 469      status.  */
 470   if (errstatus_)
 471     --errstatus_;
 472
 473   state_ = n_;
 474   goto yynewstate;
 475
 476 /*-----------------------------------------------------------.
 477 | yydefault -- do the default action for the current state.  |
 478 `-----------------------------------------------------------*/
 479  yydefault:
 480   n_ = defact_[state_];
 481   if (n_ == 0)
 482     goto yyerrlab;
 483   goto yyreduce;
 484
 485 /*-----------------------------.
 486 | yyreduce -- Do a reduction.  |
 487 `-----------------------------*/
 488  yyreduce:
 489   len_ = r2_[n_];
 490   /* If LEN_ is nonzero, implement the default value of the action:
 491      `$$ = $1'.  Otherwise, use the top of the stack.
 492
 493      Otherwise, the following line sets YYVAL to garbage.
 494      This behavior is undocumented and Bison
 495      users should not rely upon it.  */
 496   if (len_)
 497     {
 498       yyval = semantic_stack_[len_ - 1];
 499       yyloc = location_stack_[len_ - 1];
 500     }
 501   else
 502     {
 503       yyval = semantic_stack_[0];
 504       yyloc = location_stack_[0];
 505     }
 506
 507   if (len_)
 508     {
 509       Slice< LocationType, LocationStack > slice (location_stack_, len_);
 510       YYLLOC_DEFAULT (yyloc, slice, len_);
 511     }
 512   YY_REDUCE_PRINT (n_);
 513   switch (n_)
 514     {
 515       ]b4_actions[
 516     }
 517
 518 ]/* Line __line__ of lalr1.cc.  */
 519 b4_syncline([@oline@], [@ofile@])[
 520
 521   state_stack_.pop (len_);
 522   semantic_stack_.pop (len_);
 523   location_stack_.pop (len_);
 524
 525   YY_STACK_PRINT ();
 526
 527   semantic_stack_.push (yyval);
 528   location_stack_.push (yyloc);
 529
 530   /* Shift the result of the reduction.  */
 531   n_ = r1_[n_];
 532   state_ = pgoto_[n_ - ntokens_] + state_stack_[0];
 533   if (0 <= state_ && state_ <= last_ && check_[state_] == state_stack_[0])
 534     state_ = table_[state_];
 535   else
 536     state_ = defgoto_[n_ - ntokens_];
 537   goto yynewstate;
 538
 539 /*------------------------------------.
 540 | yyerrlab -- here on detecting error |
 541 `------------------------------------*/
 542  yyerrlab:
 543   /* If not already recovering from an error, report this error.  */
 544   report_syntax_error_ ();
 545
 546   error_start_ = location.begin;
 547   if (errstatus_ == 3)
 548     {
 549       /* If just tried and failed to reuse look-ahead token after an
 550          error, discard it.  */
 551
 552       /* Return failure if at end of input.  */
 553       if (looka_ <= eof_)
 554         {
 555           /* If at end of input, pop the error token,
 556              then the rest of the stack, then return failure.  */
 557           if (looka_ == eof_)
 558              for (;;)
 559                {
 560                  error_start_ = location_stack_[0].begin;
 561                  state_stack_.pop ();
 562                  semantic_stack_.pop ();
 563                  location_stack_.pop ();
 564                  if (state_stack_.height () == 1)
 565                    YYABORT;
 566 //               YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp, yylsp);
 567                  destruct_ (stos_[state_stack_[0]],
 568                             &semantic_stack_[0],
 569                             &location_stack_[0]);
 570                }
 571         }
 572       else
 573         {
 574 #if YYDEBUG
 575           YYCDEBUG << "Discarding token " << looka_
 576                    << " (" << name_[ilooka_] << ")." << std::endl;
 577 #endif
 578           destruct_ (ilooka_, &value, &location);
 579           looka_ = empty_;
 580         }
 581     }
 582
 583   /* Else will try to reuse look-ahead token after shifting the error
 584      token.  */
 585   goto yyerrlab1;
 586
 587
 588 /*---------------------------------------------------.
 589 | yyerrorlab -- error raised explicitly by YYERROR.  |
 590 `---------------------------------------------------*/
 591 yyerrorlab:
 592
 593 #ifdef __GNUC__
 594   /* Pacify GCC when the user code never invokes YYERROR and the label
 595      yyerrorlab therefore never appears in user code.  */
 596   if (0)
 597      goto yyerrorlab;
 598 #endif
 599
 600   state_stack_.pop (len_);
 601   semantic_stack_.pop (len_);
 602   error_start_ = location_stack_[len_ - 1].begin;
 603   location_stack_.pop (len_);
 604   state_ = state_stack_[0];
 605   goto yyerrlab1;
 606
 607 /*-------------------------------------------------------------.
 608 | yyerrlab1 -- common code for both syntax error and YYERROR.  |
 609 `-------------------------------------------------------------*/
 610 yyerrlab1:
 611   errstatus_ = 3;       /* Each real token shifted decrements this.  */
 612
 613   for (;;)
 614     {
 615       n_ = pact_[state_];
 616       if (n_ != pact_ninf_)
 617         {
 618           n_ += terror_;
 619           if (0 <= n_ && n_ <= last_ && check_[n_] == terror_)
 620             {
 621               n_ = table_[n_];
 622               if (0 < n_)
 623                 break;
 624             }
 625         }
 626
 627       /* Pop the current state because it cannot handle the error token.  */
 628       if (state_stack_.height () == 1)
 629         YYABORT;
 630
 631 #if YYDEBUG
 632       if (debug_)
 633         {
 634           if (stos_[state_] < ntokens_)
 635             {
 636               YYCDEBUG << "Error: popping token "
 637                      << token_number_[stos_[state_]]
 638                      << " (" << name_[stos_[state_]];
 639 # ifdef YYPRINT
 640               YYPRINT (stderr, token_number_[stos_[state_]],
 641                        semantic_stack_.top ());
 642 # endif
 643               YYCDEBUG << ')' << std::endl;
 644             }
 645           else
 646             {
 647               YYCDEBUG << "Error: popping nonterminal ("
 648                      << name_[stos_[state_]] << ')' << std::endl;
 649             }
 650         }
 651 #endif
 652       destruct_ (stos_[state_], &semantic_stack_[0], &location_stack_[0]);
 653       error_start_ = location_stack_[0].begin;
 654
 655       state_stack_.pop ();
 656       semantic_stack_.pop ();
 657       location_stack_.pop ();
 658       state_ = state_stack_[0];
 659       YY_STACK_PRINT ();
 660     }
 661
 662   if (n_ == final_)
 663     goto yyacceptlab;
 664
 665   YYCDEBUG << "Shifting error token, ";
 666
 667   {
 668     Location errloc;
 669     errloc.begin = error_start_;
 670     errloc.end = location.end;
 671     semantic_stack_.push (value);
 672     location_stack_.push (errloc);
 673   }
 674
 675   state_ = n_;
 676   goto yynewstate;
 677
 678   /* Accept.  */
 679  yyacceptlab:
 680   return 0;
 681
 682   /* Abort.  */
 683  yyabortlab:
 684   return 1;
 685 }
 686
 687 void
 688 yy::]b4_parser_class_name[::lex_ ()
 689 {
 690 #if YYLSP_NEEDED
 691   looka_ = yylex (&value, &location);
 692 #else
 693   looka_ = yylex (&value);
 694 #endif
 695 }
 696
 697 /** Generate an error message, and invoke yyerror. */
 698 void
 699 yy::]b4_parser_class_name[::report_syntax_error_ ()
 700 {
 701   /* If not already recovering from an error, report this error.  */
 702   if (!errstatus_)
 703     {
 704       ++nerrs_;
 705
 706 #if YYERROR_VERBOSE
 707       n_ = pact_[state_];
 708       if (pact_ninf_ < n_ && n_ < last_)
 709         {
 710           message = "syntax error, unexpected ";
 711           message += name_[ilooka_];
 712           {
 713             int count = 0;
 714             for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x)
 715               if (check_[x + n_] == x && x != terror_)
 716                 ++count;
 717             if (count < 5)
 718               {
 719                 count = 0;
 720                 for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x)
 721                   if (check_[x + n_] == x && x != terror_)
 722                     {
 723                       message += (!count++) ? ", expecting " : " or ";
 724                       message += name_[x];
 725                     }
 726               }
 727           }
 728         }
 729       else
 730 #endif
 731         message = "syntax error";
 732       error_ ();
 733     }
 734 }
 735
 736
 737 /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
 738    STATE-NUM.  */
 739 const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::pact_ninf_ = b4_pact_ninf[;
 740 const ]b4_int_type_for([b4_pact])[
 741 yy::]b4_parser_class_name[::pact_[] =
 742 {
 743   ]b4_pact[
 744 };
 745
 746 /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
 747    doesn't specify something else to do.  Zero means the default is an
 748    error.  */
 749 const ]b4_int_type_for([b4_defact])[
 750 yy::]b4_parser_class_name[::defact_[] =
 751 {
 752   ]b4_defact[
 753 };
 754
 755 /* YYPGOTO[NTERM-NUM].  */
 756 const ]b4_int_type_for([b4_pgoto])[
 757 yy::]b4_parser_class_name[::pgoto_[] =
 758 {
 759   ]b4_pgoto[
 760 };
 761
 762 /* YYDEFGOTO[NTERM-NUM].  */
 763 const ]b4_int_type_for([b4_defgoto])[
 764 yy::]b4_parser_class_name[::defgoto_[] =
 765 {
 766   ]b4_defgoto[
 767 };
 768
 769 /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
 770    positive, shift that token.  If negative, reduce the rule which
 771    number is the opposite.  If zero, do what YYDEFACT says.  */
 772 const ]b4_int_type(b4_table_ninf, b4_table_ninf) yy::b4_parser_class_name::table_ninf_ = b4_table_ninf[;
 773 const ]b4_int_type_for([b4_table])[
 774 yy::]b4_parser_class_name[::table_[] =
 775 {
 776   ]b4_table[
 777 };
 778
 779 /* YYCHECK.  */
 780 const ]b4_int_type_for([b4_check])[
 781 yy::]b4_parser_class_name[::check_[] =
 782 {
 783   ]b4_check[
 784 };
 785
 786 /* STOS_[STATE-NUM] -- The (internal number of the) accessing
 787    symbol of state STATE-NUM.  */
 788 const ]b4_int_type_for([b4_stos])[
 789 yy::]b4_parser_class_name[::stos_[] =
 790 {
 791   ]b4_stos[
 792 };
 793
 794 #if YYDEBUG
 795 /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal token number corresponding
 796    to YYLEX-NUM.  */
 797 const ]b4_int_type_for([b4_toknum])[
 798 yy::]b4_parser_class_name[::token_number_[] =
 799 {
 800   ]b4_toknum[
 801 };
 802 #endif
 803
 804 /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
 805 const ]b4_int_type_for([b4_r1])[
 806 yy::]b4_parser_class_name[::r1_[] =
 807 {
 808   ]b4_r1[
 809 };
 810
 811 /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
 812 const ]b4_int_type_for([b4_r2])[
 813 yy::]b4_parser_class_name[::r2_[] =
 814 {
 815   ]b4_r2[
 816 };
 817
 818 #if YYDEBUG || YYERROR_VERBOSE
 819 /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
 820    First, the terminals, then, starting at YYNTOKENS, nonterminals. */
 821 const char*
 822 const yy::]b4_parser_class_name[::name_[] =
 823 {
 824   ]b4_tname[
 825 };
 826 #endif
 827
 828 #if YYDEBUG
 829 /* YYRHS -- A `-1'-separated list of the rules' RHS. */
 830 const yy::]b4_parser_class_name[::RhsNumberType
 831 yy::]b4_parser_class_name[::rhs_[] =
 832 {
 833   ]b4_rhs[
 834 };
 835
 836 /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
 837    YYRHS.  */
 838 const ]b4_int_type_for([b4_prhs])[
 839 yy::]b4_parser_class_name[::prhs_[] =
 840 {
 841   ]b4_prhs[
 842 };
 843
 844 /* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
 845 const ]b4_int_type_for([b4_rline])[
 846 yy::]b4_parser_class_name[::rline_[] =
 847 {
 848   ]b4_rline[
 849 };
 850
 851 /** Print the state stack from its BOTTOM up to its TOP (included).  */
 852
 853 void
 854 yy::]b4_parser_class_name[::stack_print_ ()
 855 {
 856   cdebug_ << "state stack now";
 857   for (StateStack::ConstIterator i = state_stack_.begin ();
 858        i != state_stack_.end (); ++i)
 859     cdebug_ << ' ' << *i;
 860   cdebug_ << std::endl;
 861 }
 862
 863 /** Report that the YYRULE is going to be reduced.  */
 864
 865 void
 866 yy::]b4_parser_class_name[::reduce_print_ (int yyrule)
 867 {
 868   unsigned int yylno = rline_[yyrule];
 869   /* Print the symbols being reduced, and their result.  */
 870   cdebug_ << "Reducing via rule " << n_ - 1 << " (line " << yylno << "), ";
 871   for (]b4_int_type_for([b4_prhs])[ i = prhs_[n_];
 872        0 <= rhs_[i]; ++i)
 873     cdebug_ << name_[rhs_[i]] << ' ';
 874   cdebug_ << "-> " << name_[r1_[n_]] << std::endl;
 875 }
 876 #endif // YYDEBUG
 877
 878 /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
 879 yy::]b4_parser_class_name[::TokenNumberType
 880 yy::]b4_parser_class_name[::translate_ (int token)
 881 {
 882   static
 883   const TokenNumberType
 884   translate_table[] =
 885   {
 886     ]b4_translate[
 887   };
 888   if ((unsigned int) token <= user_token_number_max_)
 889     return translate_table[token];
 890   else
 891     return undef_token_;
 892 }
 893
 894 const int yy::]b4_parser_class_name[::eof_ = 0;
 895 const int yy::]b4_parser_class_name[::last_ = ]b4_last[;
 896 const int yy::]b4_parser_class_name[::nnts_ = ]b4_nterms_number[;
 897 const int yy::]b4_parser_class_name[::empty_ = -2;
 898 const int yy::]b4_parser_class_name[::final_ = ]b4_final_state_number[;
 899 const int yy::]b4_parser_class_name[::terror_ = 1;
 900 const int yy::]b4_parser_class_name[::errcode_ = 256;
 901 const int yy::]b4_parser_class_name[::ntokens_ = ]b4_tokens_number[;
 902
 903 const unsigned int yy::]b4_parser_class_name[::user_token_number_max_ = ]b4_user_token_number_max[;
 904 const yy::]b4_parser_class_name[::TokenNumberType yy::]b4_parser_class_name[::undef_token_ = ]b4_undef_token_number[;
 905
 906 ]b4_epilogue
 907 dnl
 908 @output stack.hh
 909 b4_copyright([Stack handling for Bison C++ parsers], [2002, 2003, 2004])[
 910
 911 #ifndef BISON_STACK_HH
 912 # define BISON_STACK_HH
 913
 914 #include <deque>
 915
 916 namespace yy
 917 {
 918   template < class T, class S = std::deque< T > >
 919   class Stack
 920   {
 921   public:
 922
 923     typedef typename S::iterator Iterator;
 924     typedef typename S::const_iterator ConstIterator;
 925
 926     Stack () : seq_ ()
 927     {
 928     }
 929
 930     Stack (unsigned int n) : seq_ (n)
 931     {
 932     }
 933
 934     inline
 935     T&
 936     operator [] (unsigned int i)
 937     {
 938       return seq_[i];
 939     }
 940
 941     inline
 942     const T&
 943     operator [] (unsigned int i) const
 944     {
 945       return seq_[i];
 946     }
 947
 948     inline
 949     void
 950     push (const T& t)
 951     {
 952       seq_.push_front (t);
 953     }
 954
 955     inline
 956     void
 957     pop (unsigned int n = 1)
 958     {
 959       for (; n; --n)
 960         seq_.pop_front ();
 961     }
 962
 963     inline
 964     unsigned int
 965     height () const
 966     {
 967       return seq_.size ();
 968     }
 969
 970     inline ConstIterator begin () const { return seq_.begin (); }
 971     inline ConstIterator end () const { return seq_.end (); }
 972
 973   private:
 974
 975     S seq_;
 976   };
 977
 978   template < class T, class S = Stack< T > >
 979   class Slice
 980   {
 981   public:
 982
 983     Slice (const S& stack,
 984            unsigned int range) : stack_ (stack),
 985                                  range_ (range)
 986     {
 987     }
 988
 989     inline
 990     const T&
 991     operator [] (unsigned int i) const
 992     {
 993       return stack_[range_ - i];
 994     }
 995
 996   private:
 997
 998     const S& stack_;
 999     unsigned int range_;
1000   };
1001 }
1002
1003 #endif // not BISON_STACK_HH]
1004 dnl
1005 @output position.hh
1006 b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004])[
1007
1008 /**
1009  ** \file position.hh
1010  ** Define the Location class.
1011  */
1012
1013 #ifndef BISON_POSITION_HH
1014 # define BISON_POSITION_HH
1015
1016 # include <iostream>
1017 # include <string>
1018
1019 namespace yy
1020 {
1021   /** \brief Abstract a Position. */
1022   class Position
1023   {
1024   public:
1025     /** \brief Initial column number. */
1026     static const unsigned int initial_column = 0;
1027     /** \brief Initial line number. */
1028     static const unsigned int initial_line = 1;
1029
1030     /** \name Ctor & dtor.
1031      ** \{ */
1032   public:
1033     /** \brief Construct a Position. */
1034     Position () :
1035       filename (),
1036       line (initial_line),
1037       column (initial_column)
1038     {
1039     }
1040     /** \} */
1041
1042
1043     /** \name Line and Column related manipulators
1044      ** \{ */
1045   public:
1046     /** \brief (line related) Advance to the COUNT next lines. */
1047     inline void lines (int count = 1)
1048     {
1049       column = initial_column;
1050       line += count;
1051     }
1052
1053     /** \brief (column related) Advance to the COUNT next columns. */
1054     inline void columns (int count = 1)
1055     {
1056       int leftmost = initial_column;
1057       int current  = column;
1058       if (leftmost <= current + count)
1059         column += count;
1060       else
1061         column = initial_column;
1062     }
1063     /** \} */
1064
1065   public:
1066     /** \brief File name to which this position refers. */
1067     std::string filename;
1068     /** \brief Current line number. */
1069     unsigned int line;
1070     /** \brief Current column number. */
1071     unsigned int column;
1072   };
1073
1074   /** \brief Add and assign a Position. */
1075   inline const Position&
1076   operator+= (Position& res, const int width)
1077   {
1078     res.columns (width);
1079     return res;
1080   }
1081
1082   /** \brief Add two Position objects. */
1083   inline const Position
1084   operator+ (const Position& begin, const int width)
1085   {
1086     Position res = begin;
1087     return res += width;
1088   }
1089
1090   /** \brief Add and assign a Position. */
1091   inline const Position&
1092   operator-= (Position& res, const int width)
1093   {
1094     return res += -width;
1095   }
1096
1097   /** \brief Add two Position objects. */
1098   inline const Position
1099   operator- (const Position& begin, const int width)
1100   {
1101     return begin + -width;
1102   }
1103
1104   /** \brief Intercept output stream redirection.
1105    ** \param ostr the destination output stream
1106    ** \param pos a reference to the Position to redirect
1107    */
1108   inline std::ostream&
1109   operator<< (std::ostream& ostr, const Position& pos)
1110   {
1111     if (!pos.filename.empty ())
1112       ostr << pos.filename << ':';
1113     return ostr << pos.line << '.' << pos.column;
1114   }
1115
1116 }
1117 #endif // not BISON_POSITION_HH]
1118 @output location.hh
1119 b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004])[
1120
1121 /**
1122  ** \file location.hh
1123  ** Define the Location class.
1124  */
1125
1126 #ifndef BISON_LOCATION_HH
1127 # define BISON_LOCATION_HH
1128
1129 # include <iostream>
1130 # include <string>
1131 # include "position.hh"
1132
1133 namespace yy
1134 {
1135
1136   /** \brief Abstract a Location. */
1137   class Location
1138   {
1139     /** \name Ctor & dtor.
1140      ** \{ */
1141   public:
1142     /** \brief Construct a Location. */
1143     Location (void) :
1144       begin (),
1145       end ()
1146     {
1147     }
1148     /** \} */
1149
1150
1151     /** \name Line and Column related manipulators
1152      ** \{ */
1153   public:
1154     /** \brief Reset initial location to final location. */
1155     inline void step (void)
1156     {
1157       begin = end;
1158     }
1159
1160     /** \brief Extend the current location to the COUNT next columns. */
1161     inline void columns (unsigned int count = 1)
1162     {
1163       end += count;
1164     }
1165
1166     /** \brief Extend the current location to the COUNT next lines. */
1167     inline void lines (unsigned int count = 1)
1168     {
1169       end.lines (count);
1170     }
1171     /** \} */
1172
1173
1174   public:
1175     /** \brief Beginning of the located region. */
1176     Position begin;
1177     /** \brief End of the located region. */
1178     Position end;
1179   };
1180
1181   /** \brief Join two Location objects to create a Location. */
1182   inline const Location operator+ (const Location& begin, const Location& end)
1183   {
1184     Location res = begin;
1185     res.end = end.end;
1186     return res;
1187   }
1188
1189   /** \brief Add two Location objects */
1190   inline const Location operator+ (const Location& begin, unsigned int width)
1191   {
1192     Location res = begin;
1193     res.columns (width);
1194     return res;
1195   }
1196
1197   /** \brief Add and assign a Location */
1198   inline Location &operator+= (Location& res, unsigned int width)
1199   {
1200     res.columns (width);
1201     return res;
1202   }
1203
1204   /** \brief Intercept output stream redirection.
1205    ** \param ostr the destination output stream
1206    ** \param loc a reference to the Location to redirect
1207    **
1208    ** Avoid duplicate information.
1209    */
1210   inline std::ostream& operator<< (std::ostream& ostr, const Location& loc)
1211   {
1212     Position last = loc.end - 1;
1213     ostr << loc.begin;
1214     if (loc.begin.filename != last.filename)
1215       ostr << '-' << last;
1216     else if (loc.begin.line != last.line)
1217       ostr << '-' << last.line  << '.' << last.column;
1218     else if (loc.begin.column != last.column)
1219       ostr << '-' << last.column;
1220     return ostr;
1221   }
1222
1223 }
1224
1225 #endif // not BISON_LOCATION_HH]