data/lalr1.java

   1 # Java skeleton for Bison -*- autoconf -*-
   2
   3 # Copyright (C) 2007 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_include(b4_pkgdatadir/[java.m4])
  19
  20 b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java], [b4_skeleton])])
  21 m4_ifval(m4_defn([b4_symbol_destructors]),
  22         [b4_fatal([%s: %%destructor does not make sense in Java], [b4_skeleton])],
  23         [])
  24
  25 m4_divert_push(0)dnl
  26 @output(b4_parser_file_name@)
  27 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
  28   [2007])
  29
  30 b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);
  31 ])[/* First part of user declarations.  */
  32 ]b4_pre_prologue
  33 b4_percent_code_get([[imports]])
  34 [/**
  35  * A Bison parser, automatically generated from <tt>@ofile@</tt>.
  36  *
  37  * @@author LALR (1) parser skeleton written by Paolo Bonzini.
  38  */
  39 ]b4_public_if([public ])b4_abstract_if([abstract ])[class ]b4_parser_class_name[
  40 {
  41   ]b4_identification[
  42
  43   /** True if verbose error messages are enabled.  */
  44   public boolean errorVerbose = ]b4_flag_value([error_verbose]);
  45
  46 b4_locations_if([[
  47   /**
  48    * A class defining a pair of positions.  Positions, defined by the
  49    * <code>]b4_position_type[</code> class, denote a point in the input.
  50    * Locations represent a part of the input through the beginning
  51    * and ending positions.  */
  52   public class ]b4_location_type[ {
  53     /** The first, inclusive, position in the range.  */
  54     public ]b4_position_type[ begin;
  55
  56     /** The first position beyond the range.  */
  57     public ]b4_position_type[ end;
  58
  59     /**
  60      * Create a ]b4_location_type[ denoting an empty range located at
  61      * a given point.
  62      * @@param loc The position at which the range is anchored.  */
  63     public ]b4_location_type[ (]b4_position_type[ loc) {
  64       this.begin = this.end = loc;
  65     }
  66
  67     /**
  68      * Create a <code>]b4_location_type[</code> from the endpoints of the range.
  69      * @@param begin The first position included in the range.
  70      * @@param begin The first position beyond the range.  */
  71     public ]b4_location_type[ (]b4_position_type[ begin, ]b4_position_type[ end) {
  72       this.begin = begin;
  73       this.end = end;
  74     }
  75
  76     /**
  77      * Print a representation of the location.  For this to be correct,
  78      * <code>]b4_position_type[</code> should override the <code>equals</code>
  79      * method.  */
  80     public String toString () {
  81       if (begin.equals (end))
  82         return begin.toString ();
  83       else
  84         return begin.toString () + "-" + end.toString ();
  85     }
  86   }
  87
  88 ]])
  89
  90 [  /** Token returned by the scanner to signal the end of its input.  */
  91   public static final int EOF = 0;]
  92
  93 b4_token_enums(b4_tokens)
  94
  95   b4_locations_if([[
  96   private ]b4_location_type[ yylloc (YYStack rhs, int n)
  97   {
  98     if (n > 0)
  99       return new ]b4_location_type[ (rhs.locationAt (1).begin, rhs.locationAt (n).end);
 100     else
 101       return new ]b4_location_type[ (rhs.locationAt (0).end);
 102   }]])
 103
 104   /**
 105    * Communication interface between the scanner and the Bison-generated
 106    * parser <tt>]b4_parser_class_name[</tt>.
 107    */
 108   public interface Lexer {
 109     ]b4_locations_if([[/**
 110      * Method to retrieve the beginning position of the last scanned token.
 111      * @@return the position at which the last scanned token starts.  */
 112     ]b4_position_type[ getStartPos ();
 113
 114     /**
 115      * Method to retrieve the ending position of the last scanned token.
 116      * @@return the first position beyond the last scanned token.  */
 117     ]b4_position_type[ getEndPos ();]])[
 118
 119     /**
 120      * Method to retrieve the semantic value of the last scanned token.
 121      * @@return the semantic value of the last scanned token.  */
 122     ]b4_yystype[ getLVal ();
 123
 124     /**
 125      * Entry point for the scanner.  Returns the token identifier corresponding
 126      * to the next token and prepares to return the semantic value
 127      * ]b4_locations_if([and beginning/ending positions ])[of the token.
 128      * @@return the token identifier corresponding to the next token. */
 129     int yylex () ]b4_maybe_throws([b4_lex_throws])[;
 130
 131     /**
 132      * Entry point for error reporting.  Emits an error
 133      * ]b4_locations_if([ referring to the given location])[in a user-defined
 134      * way.
 135      *
 136      * ]b4_locations_if([loc], [[The location of the element to which the
 137      *                error message is related]])[
 138      * @@param s The string for the error message.  */
 139      void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String s);]
 140   }
 141
 142   b4_lexer_if([[private class YYLexer implements Lexer {
 143 ]b4_percent_code_get([[lexer]])[
 144   }
 145
 146   ]])[/** The object doing lexical analysis for us.  */
 147   private Lexer yylexer;
 148   ]
 149   b4_parse_param_vars
 150
 151 b4_lexer_if([[
 152   /**
 153    * Instantiates the Bison-generated parser.
 154    */
 155   public ]b4_parser_class_name (b4_parse_param_decl([b4_lex_param_decl])[) {
 156     this.yylexer = new YYLexer(]b4_lex_param_call[);
 157     ]b4_parse_param_cons[
 158   }
 159 ]])
 160
 161   /**
 162    * Instantiates the Bison-generated parser.
 163    * @@param yylex The scanner that will supply tokens to the parser.
 164    */
 165   b4_lexer_if([[protected]], [[public]]) b4_parser_class_name[ (]b4_parse_param_decl([[Lexer yylexer]])[) {
 166     this.yylexer = yylexer;
 167     ]b4_parse_param_cons[
 168   }
 169
 170   private java.io.PrintStream yyDebugStream = System.err;
 171
 172   /**
 173    * Return the <tt>PrintStream</tt> on which the debugging output is
 174    * printed.
 175    */
 176   public final java.io.PrintStream getDebugStream () { return yyDebugStream; }
 177
 178   /**
 179    * Set the <tt>PrintStream</tt> on which the debug output is printed.
 180    * @@param s The stream that is used for debugging output.
 181    */
 182   public final void setDebugStream(java.io.PrintStream s) { yyDebugStream = s; }
 183
 184   private int yydebug = 0;
 185
 186   /**
 187    * Answer the verbosity of the debugging output; 0 means that all kinds of
 188    * output from the parser are suppressed.
 189    */
 190   public final int getDebugLevel() { return yydebug; }
 191
 192   /**
 193    * Set the verbosity of the debugging output; 0 means that all kinds of
 194    * output from the parser are suppressed.
 195    * @@param level The verbosity level for debugging output.
 196    */
 197   public final void setDebugLevel(int level) { yydebug = level; }
 198
 199   private final int yylex () ]b4_maybe_throws([b4_lex_throws]) [{
 200     return yylexer.yylex ();
 201   }
 202   protected final void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String s) {
 203     yylexer.yyerror (]b4_locations_if([loc, ])[s);
 204   }
 205
 206   ]b4_locations_if([
 207   protected final void yyerror (String s) {
 208     yylexer.yyerror ((Location)null, s);
 209   }
 210   protected final void yyerror (]b4_position_type[ loc, String s) {
 211     yylexer.yyerror (new ]b4_location_type[ (loc), s);
 212   }])
 213
 214   [protected final void yycdebug (String s) {
 215     if (yydebug > 0)
 216       yyDebugStream.println (s);
 217   }
 218
 219   private final class YYStack {
 220     private int[] stateStack = new int[16];
 221     ]b4_locations_if([[private ]b4_location_type[[] locStack = new ]b4_location_type[[16];]])[
 222     private ]b4_yystype[[] valueStack = new ]b4_yystype[[16];
 223
 224     public int size = 16;
 225     public int height = -1;
 226
 227     public final void push (int state, ]b4_yystype[ value]dnl
 228                             b4_locations_if([, ]b4_location_type[ loc])[) {
 229       height++;
 230       if (size == height)
 231         {
 232           int[] newStateStack = new int[size * 2];
 233           System.arraycopy (stateStack, 0, newStateStack, 0, height);
 234           stateStack = newStateStack;
 235           ]b4_locations_if([[
 236           ]b4_location_type[[] newLocStack = new ]b4_location_type[[size * 2];
 237           System.arraycopy (locStack, 0, newLocStack, 0, height);
 238           locStack = newLocStack;]])
 239
 240           b4_yystype[[] newValueStack = new ]b4_yystype[[size * 2];
 241           System.arraycopy (valueStack, 0, newValueStack, 0, height);
 242           valueStack = newValueStack;
 243
 244           size *= 2;
 245         }
 246
 247       stateStack[height] = state;
 248       ]b4_locations_if([[locStack[height] = loc;]])[
 249       valueStack[height] = value;
 250     }
 251
 252     public final void pop () {
 253       height--;
 254     }
 255
 256     public final void pop (int num) {
 257       // Avoid memory leaks... garbage collection is a white lie!
 258       if (num > 0) {
 259         java.util.Arrays.fill (valueStack, height - num + 1, height, null);
 260         ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height, null);]])[
 261       }
 262       height -= num;
 263     }
 264
 265     public final int stateAt (int i) {
 266       return stateStack[height - i];
 267     }
 268
 269     ]b4_locations_if([[public final ]b4_location_type[ locationAt (int i) {
 270       return locStack[height - i];
 271     }
 272
 273     ]])[public final ]b4_yystype[ valueAt (int i) {
 274       return valueStack[height - i];
 275     }
 276
 277     // Print the state stack on the debug stream.
 278     public void print (java.io.PrintStream out)
 279     {
 280       out.print ("Stack now");
 281
 282       for (int i = 0; i < height; i++)
 283         {
 284           out.print (' ');
 285           out.print (stateStack[i]);
 286         }
 287       out.println ();
 288     }
 289   }
 290
 291   /**
 292    * Returned by a Bison action in order to stop the parsing process and
 293    * return success (<tt>true</tt>).  */
 294   public static final int YYACCEPT = 0;
 295
 296   /**
 297    * Returned by a Bison action in order to stop the parsing process and
 298    * return failure (<tt>false</tt>).  */
 299   public static final int YYABORT = 1;
 300
 301   /**
 302    * Returned by a Bison action in order to start error recovery without
 303    * printing an error message.  */
 304   public static final int YYERROR = 2;
 305
 306   /**
 307    * Returned by a Bison action in order to print an error message and start
 308    * error recovery.  */
 309   public static final int YYFAIL = 3;
 310
 311   private static final int YYNEWSTATE = 4;
 312   private static final int YYDEFAULT = 5;
 313   private static final int YYREDUCE = 6;
 314   private static final int YYERRLAB1 = 7;
 315   private static final int YYRETURN = 8;
 316
 317   private int yyerrstatus_ = 0;
 318
 319   /**
 320    * Return whether error recovery is being done.  In this state, the parser
 321    * reads token until it reaches a known state, and then restarts normal
 322    * operation.  */
 323   public final boolean recovering ()
 324   {
 325     return yyerrstatus_ == 0;
 326   }
 327
 328   private int yyaction (int yyn, YYStack yystack, int yylen)
 329   {
 330     ]b4_yystype[ yyval;
 331     ]b4_locations_if([b4_location_type[ yyloc = yylloc (yystack, yylen);]])[
 332
 333     /* If YYLEN is nonzero, implement the default value of the action:
 334        `$$ = $1'.  Otherwise, use the top of the stack.
 335
 336        Otherwise, the following line sets YYVAL to garbage.
 337        This behavior is undocumented and Bison
 338        users should not rely upon it.  */
 339     if (yylen > 0)
 340       yyval = yystack.valueAt (yylen - 1);
 341     else
 342       yyval = yystack.valueAt (0);
 343
 344     yy_reduce_print (yyn, yystack);
 345
 346     switch (yyn)
 347       {
 348         ]b4_user_actions[
 349         default: break;
 350       }
 351
 352     yy_symbol_print ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[);
 353
 354     yystack.pop (yylen);
 355     yylen = 0;
 356
 357     /* Shift the result of the reduction.  */
 358     yyn = yyr1_[yyn];
 359     int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
 360     if (0 <= yystate && yystate <= yylast_
 361         && yycheck_[yystate] == yystack.stateAt (0))
 362       yystate = yytable_[yystate];
 363     else
 364       yystate = yydefgoto_[yyn - yyntokens_];
 365
 366     yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
 367     return YYNEWSTATE;
 368   }
 369
 370   /* Return YYSTR after stripping away unnecessary quotes and
 371      backslashes, so that it's suitable for yyerror.  The heuristic is
 372      that double-quoting is unnecessary unless the string contains an
 373      apostrophe, a comma, or backslash (other than backslash-backslash).
 374      YYSTR is taken from yytname.  */
 375   private final String yytnamerr_ (String yystr)
 376   {
 377     if (yystr.charAt (0) == '"')
 378       {
 379         StringBuffer yyr = new StringBuffer ();
 380         strip_quotes: for (int i = 1; i < yystr.length (); i++)
 381           switch (yystr.charAt (i))
 382             {
 383             case '\'':
 384             case ',':
 385               break strip_quotes;
 386
 387             case '\\':
 388               if (yystr.charAt(++i) != '\\')
 389                 break strip_quotes;
 390               /* Fall through.  */
 391             default:
 392               yyr.append (yystr.charAt (i));
 393               break;
 394
 395             case '"':
 396               return yyr.toString ();
 397             }
 398       }
 399     else if (yystr.equals ("$end"))
 400       return "end of input";
 401
 402     return yystr;
 403   }
 404
 405   /*--------------------------------.
 406   | Print this symbol on YYOUTPUT.  |
 407   `--------------------------------*/
 408
 409   private void yy_symbol_print (String s, int yytype,
 410                                  ]b4_yystype[ yyvaluep]dnl
 411                                  b4_locations_if([, Object yylocationp])[)
 412   {
 413     if (yydebug > 0)
 414     yycdebug (s + (yytype < yyntokens_ ? " token " : " nterm ")
 415               + yytname_[yytype] + " ("]b4_locations_if([
 416               + yylocationp + ": "])[
 417               + (yyvaluep == null ? "(null)" : yyvaluep) + ")");
 418   }
 419
 420   /**
 421    * Parse input from the scanner that was specified at object construction
 422    * time.  Return whether the end of the input was reached successfully.
 423    *
 424    * @@return <tt>true</tt> if the parsing succeeds.  Note that this does not
 425    *          imply that there were no syntax errors.
 426    */
 427   public boolean parse () ]b4_maybe_throws([b4_throws])[
 428   {
 429     /// Lookahead and lookahead in internal form.
 430     int yychar = yyempty_;
 431     int yytoken = 0;
 432
 433     /* State.  */
 434     int yyn = 0;
 435     int yylen = 0;
 436     int yystate = 0;
 437
 438     YYStack yystack = new YYStack ();
 439
 440     /* Error handling.  */
 441     int yynerrs_ = 0;
 442     ]b4_locations_if([/// The location where the error started.
 443     ]b4_location_type[ yyerrloc = null;
 444
 445     /// ]b4_location_type[ of the lookahead.
 446     ]b4_location_type[ yylloc = new ]b4_location_type[ (null, null);
 447
 448     /// @@$.
 449     ]b4_location_type[ yyloc;])
 450
 451     /// Semantic value of the lookahead.
 452     b4_yystype[ yylval = null;
 453
 454     int yyresult;
 455
 456     yycdebug ("Starting parse\n");
 457     yyerrstatus_ = 0;
 458
 459 ]m4_ifdef([b4_initial_action], [
 460 m4_pushdef([b4_at_dollar],     [yylloc])dnl
 461 m4_pushdef([b4_dollar_dollar], [yylval])dnl
 462     /* User initialization code.  */
 463     b4_user_initial_action
 464 m4_popdef([b4_dollar_dollar])dnl
 465 m4_popdef([b4_at_dollar])])dnl
 466
 467   [  /* Initialize the stack.  */
 468     yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
 469
 470     int label = YYNEWSTATE;
 471     for (;;)
 472       switch (label)
 473       {
 474         /* New state.  Unlike in the C/C++ skeletons, the state is already
 475            pushed when we come here.  */
 476       case YYNEWSTATE:
 477         yycdebug ("Entering state " + yystate + "\n");
 478         if (yydebug > 0)
 479           yystack.print (yyDebugStream);
 480
 481         /* Accept?  */
 482         if (yystate == yyfinal_)
 483           return true;
 484
 485         /* Take a decision.  First try without lookahead.  */
 486         yyn = yypact_[yystate];
 487         if (yyn == yypact_ninf_)
 488           {
 489             label = YYDEFAULT;
 490             break;
 491           }
 492
 493         /* Read a lookahead token.  */
 494         if (yychar == yyempty_)
 495           {
 496             yycdebug ("Reading a token: ");
 497             yychar = yylex ();]
 498             b4_locations_if([[
 499             yylloc = new ]b4_location_type[(yylexer.getStartPos (),
 500                                             yylexer.getEndPos ());]])
 501             yylval = yylexer.getLVal ();[
 502           }
 503
 504         /* Convert token to internal form.  */
 505         if (yychar <= EOF)
 506           {
 507             yychar = yytoken = EOF;
 508             yycdebug ("Now at end of input.\n");
 509           }
 510         else
 511           {
 512             yytoken = yytranslate_ (yychar);
 513             yy_symbol_print ("Next token is", yytoken,
 514                              yylval]b4_locations_if([, yylloc])[);
 515           }
 516
 517         /* If the proper action on seeing token YYTOKEN is to reduce or to
 518            detect an error, take that action.  */
 519         yyn += yytoken;
 520         if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
 521           label = YYDEFAULT;
 522
 523         /* <= 0 means reduce or error.  */
 524         else if ((yyn = yytable_[yyn]) <= 0)
 525           {
 526             if (yyn == 0 || yyn == yytable_ninf_)
 527               label = YYFAIL;
 528             else
 529               {
 530                 yyn = -yyn;
 531                 label = YYREDUCE;
 532               }
 533           }
 534
 535         else
 536           {
 537             /* Shift the lookahead token.  */
 538             yy_symbol_print ("Shifting", yytoken,
 539                              yylval]b4_locations_if([, yylloc])[);
 540
 541             /* Discard the token being shifted.  */
 542             yychar = yyempty_;
 543
 544             /* Count tokens shifted since error; after three, turn off error
 545                status.  */
 546             if (yyerrstatus_ > 0)
 547               --yyerrstatus_;
 548
 549             yystate = yyn;
 550             yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
 551             label = YYNEWSTATE;
 552           }
 553         break;
 554
 555       /*-----------------------------------------------------------.
 556       | yydefault -- do the default action for the current state.  |
 557       `-----------------------------------------------------------*/
 558       case YYDEFAULT:
 559         yyn = yydefact_[yystate];
 560         if (yyn == 0)
 561           label = YYFAIL;
 562         else
 563           label = YYREDUCE;
 564         break;
 565
 566       /*-----------------------------.
 567       | yyreduce -- Do a reduction.  |
 568       `-----------------------------*/
 569       case YYREDUCE:
 570         yylen = yyr2_[yyn];
 571         label = yyaction (yyn, yystack, yylen);
 572         yystate = yystack.stateAt (0);
 573         break;
 574
 575       /*------------------------------------.
 576       | yyerrlab -- here on detecting error |
 577       `------------------------------------*/
 578       case YYFAIL:
 579         /* If not already recovering from an error, report this error.  */
 580         if (yyerrstatus_ == 0)
 581           {
 582             ++yynerrs_;
 583             yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
 584           }
 585
 586         ]b4_locations_if([yyerrloc = yylloc;])[
 587         if (yyerrstatus_ == 3)
 588           {
 589             /* If just tried and failed to reuse lookahead token after an
 590              error, discard it.  */
 591
 592             if (yychar <= EOF)
 593               {
 594               /* Return failure if at end of input.  */
 595               if (yychar == EOF)
 596                 return false;
 597               }
 598             else
 599               yychar = yyempty_;
 600           }
 601
 602         /* Else will try to reuse lookahead token after shifting the error
 603            token.  */
 604         label = YYERRLAB1;
 605         break;
 606
 607       /*---------------------------------------------------.
 608       | errorlab -- error raised explicitly by YYERROR.  |
 609       `---------------------------------------------------*/
 610       case YYERROR:
 611
 612         ]b4_locations_if([yyerrloc = yystack.locationAt (yylen - 1);])[
 613         /* Do not reclaim the symbols of the rule which action triggered
 614            this YYERROR.  */
 615         yystack.pop (yylen);
 616         yylen = 0;
 617         yystate = yystack.stateAt (0);
 618         label = YYERRLAB1;
 619         break;
 620
 621       /*-------------------------------------------------------------.
 622       | yyerrlab1 -- common code for both syntax error and YYERROR.  |
 623       `-------------------------------------------------------------*/
 624       case YYERRLAB1:
 625         yyerrstatus_ = 3;       /* Each real token shifted decrements this.  */
 626
 627         for (;;)
 628           {
 629             yyn = yypact_[yystate];
 630             if (yyn != yypact_ninf_)
 631               {
 632                 yyn += yyterror_;
 633                 if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
 634                   {
 635                     yyn = yytable_[yyn];
 636                     if (0 < yyn)
 637                       break;
 638                   }
 639               }
 640
 641             /* Pop the current state because it cannot handle the error token.  */
 642             if (yystack.height == 1)
 643               return false;
 644
 645             ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
 646             yystack.pop ();
 647             yystate = yystack.stateAt (0);
 648             if (yydebug > 0)
 649               yystack.print (yyDebugStream);
 650           }
 651
 652         ]b4_locations_if([
 653         /* Muck with the stack to setup for yylloc.  */
 654         yystack.push (0, null, yylloc);
 655         yystack.push (0, null, yyerrloc);
 656         yyloc = yylloc (yystack, 2);
 657         yystack.pop (2);])[
 658
 659         /* Shift the error token.  */
 660         yy_symbol_print ("Shifting", yystos_[yyn],
 661                          yylval]b4_locations_if([, yyloc])[);
 662
 663         yystate = yyn;
 664         yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
 665         label = YYNEWSTATE;
 666         break;
 667
 668         /* Accept.  */
 669       case YYACCEPT:
 670         return true;
 671
 672         /* Abort.  */
 673       case YYABORT:
 674         return false;
 675       }
 676   }
 677
 678   // Generate an error message.
 679   private String yysyntax_error (int yystate, int tok)
 680   {
 681     if (errorVerbose)
 682       {
 683         int yyn = yypact_[yystate];
 684         if (yypact_ninf_ < yyn && yyn <= yylast_)
 685           {
 686             StringBuffer res;
 687
 688             /* Start YYX at -YYN if negative to avoid negative indexes in
 689                YYCHECK.  */
 690             int yyxbegin = yyn < 0 ? -yyn : 0;
 691
 692             /* Stay within bounds of both yycheck and yytname.  */
 693             int yychecklim = yylast_ - yyn + 1;
 694             int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
 695             int count = 0;
 696             for (int x = yyxbegin; x < yyxend; ++x)
 697               if (yycheck_[x + yyn] == x && x != yyterror_)
 698                 ++count;
 699
 700             // FIXME: This method of building the message is not compatible
 701             // with internationalization.
 702             res = new StringBuffer ("syntax error, unexpected ");
 703             res.append (yytnamerr_ (yytname_[tok]));
 704             if (count < 5)
 705               {
 706                 count = 0;
 707                 for (int x = yyxbegin; x < yyxend; ++x)
 708                   if (yycheck_[x + yyn] == x && x != yyterror_)
 709                     {
 710                       res.append (count++ == 0 ? ", expecting " : " or ");
 711                       res.append (yytnamerr_ (yytname_[x]));
 712                     }
 713               }
 714             return res.toString ();
 715           }
 716       }
 717
 718     return "syntax error";
 719   }
 720
 721
 722   /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
 723      STATE-NUM.  */
 724   private static final ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
 725   private static final ]b4_int_type_for([b4_pact])[ yypact_[] =
 726   {
 727     ]b4_pact[
 728   };
 729
 730   /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
 731      doesn't specify something else to do.  Zero means the default is an
 732      error.  */
 733   private static final ]b4_int_type_for([b4_defact])[ yydefact_[] =
 734   {
 735     ]b4_defact[
 736   };
 737
 738   /* YYPGOTO[NTERM-NUM].  */
 739   private static final ]b4_int_type_for([b4_pgoto])[ yypgoto_[] =
 740   {
 741     ]b4_pgoto[
 742   };
 743
 744   /* YYDEFGOTO[NTERM-NUM].  */
 745   private static final ]b4_int_type_for([b4_defgoto])[
 746   yydefgoto_[] =
 747   {
 748     ]b4_defgoto[
 749   };
 750
 751   /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
 752      positive, shift that token.  If negative, reduce the rule which
 753      number is the opposite.  If zero, do what YYDEFACT says.  */
 754   private static final ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
 755   private static final ]b4_int_type_for([b4_table])[
 756   yytable_[] =
 757   {
 758     ]b4_table[
 759   };
 760
 761   /* YYCHECK.  */
 762   private static final ]b4_int_type_for([b4_check])[
 763   yycheck_[] =
 764   {
 765     ]b4_check[
 766   };
 767
 768   /* STOS_[STATE-NUM] -- The (internal number of the) accessing
 769      symbol of state STATE-NUM.  */
 770   private static final ]b4_int_type_for([b4_stos])[
 771   yystos_[] =
 772   {
 773     ]b4_stos[
 774   };
 775
 776   /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
 777      to YYLEX-NUM.  */
 778   private static final ]b4_int_type_for([b4_toknum])[
 779   yytoken_number_[] =
 780   {
 781     ]b4_toknum[
 782   };
 783
 784   /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
 785   private static final ]b4_int_type_for([b4_r1])[
 786   yyr1_[] =
 787   {
 788     ]b4_r1[
 789   };
 790
 791   /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
 792   private static final ]b4_int_type_for([b4_r2])[
 793   yyr2_[] =
 794   {
 795     ]b4_r2[
 796   };
 797
 798   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
 799      First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
 800   private static final String yytname_[] =
 801   {
 802     ]b4_tname[
 803   };
 804
 805   /* YYRHS -- A `-1'-separated list of the rules' RHS.  */
 806   private static final ]b4_int_type_for([b4_rhs])[ yyrhs_[] =
 807   {
 808     ]b4_rhs[
 809   };
 810
 811   /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
 812      YYRHS.  */
 813   private static final ]b4_int_type_for([b4_prhs])[ yyprhs_[] =
 814   {
 815     ]b4_prhs[
 816   };
 817
 818   /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
 819   private static final ]b4_int_type_for([b4_rline])[ yyrline_[] =
 820   {
 821     ]b4_rline[
 822   };
 823
 824   // Report on the debug stream that the rule yyrule is going to be reduced.
 825   private void yy_reduce_print (int yyrule, YYStack yystack)
 826   {
 827     if (yydebug == 0)
 828       return;
 829
 830     int yylno = yyrline_[yyrule];
 831     int yynrhs = yyr2_[yyrule];
 832     /* Print the symbols being reduced, and their result.  */
 833     yycdebug ("Reducing stack by rule " + (yyrule - 1)
 834               + " (line " + yylno + "), ");
 835
 836     /* The symbols being reduced.  */
 837     for (int yyi = 0; yyi < yynrhs; yyi++)
 838       yy_symbol_print ("   $" + (yyi + 1) + " =",
 839                        yyrhs_[yyprhs_[yyrule] + yyi],
 840                        ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
 841                        b4_rhs_location(yynrhs, yyi + 1)])[);
 842   }
 843
 844   /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
 845   private static final ]b4_int_type_for([b4_translate])[ yytranslate_table_[] =
 846   {
 847     ]b4_translate[
 848   };
 849
 850   private static final ]b4_int_type_for([b4_translate])[ yytranslate_ (int t)
 851   {
 852     if (t >= 0 && t <= yyuser_token_number_max_)
 853       return yytranslate_table_[t];
 854     else
 855       return yyundef_token_;
 856   }
 857
 858   private static final int yylast_ = ]b4_last[;
 859   private static final int yynnts_ = ]b4_nterms_number[;
 860   private static final int yyempty_ = -2;
 861   private static final int yyfinal_ = ]b4_final_state_number[;
 862   private static final int yyterror_ = 1;
 863   private static final int yyerrcode_ = 256;
 864   private static final int yyntokens_ = ]b4_tokens_number[;
 865
 866   private static final int yyuser_token_number_max_ = ]b4_user_token_number_max[;
 867   private static final int yyundef_token_ = ]b4_undef_token_number[;
 868
 869 ]/* User implementation code.  */
 870 b4_percent_code_get[]dnl
 871
 872 }
 873
 874 b4_epilogue
 875 m4_divert_pop(0)dnl