sqlite3/lempar.c

   1 /* Driver template for the LEMON parser generator.
   2 ** The author disclaims copyright to this source code.
   3 */
   4 /* First off, code is include which follows the "include" declaration
   5 ** in the input file. */
   6 #include <stdio.h>
   7 %%
   8 /* Next is all token values, in a form suitable for use by makeheaders.
   9 ** This section will be null unless lemon is run with the -m switch.
  10 */
  11 /*
  12 ** These constants (all generated automatically by the parser generator)
  13 ** specify the various kinds of tokens (terminals) that the parser
  14 ** understands.
  15 **
  16 ** Each symbol here is a terminal symbol in the grammar.
  17 */
  18 %%
  19 /* Make sure the INTERFACE macro is defined.
  20 */
  21 #ifndef INTERFACE
  22 # define INTERFACE 1
  23 #endif
  24 /* The next thing included is series of defines which control
  25 ** various aspects of the generated parser.
  26 **    YYCODETYPE         is the data type used for storing terminal
  27 **                       and nonterminal numbers.  "unsigned char" is
  28 **                       used if there are fewer than 250 terminals
  29 **                       and nonterminals.  "int" is used otherwise.
  30 **    YYNOCODE           is a number of type YYCODETYPE which corresponds
  31 **                       to no legal terminal or nonterminal number.  This
  32 **                       number is used to fill in empty slots of the hash
  33 **                       table.
  34 **    YYFALLBACK         If defined, this indicates that one or more tokens
  35 **                       have fall-back values which should be used if the
  36 **                       original value of the token will not parse.
  37 **    YYACTIONTYPE       is the data type used for storing terminal
  38 **                       and nonterminal numbers.  "unsigned char" is
  39 **                       used if there are fewer than 250 rules and
  40 **                       states combined.  "int" is used otherwise.
  41 **    ParseTOKENTYPE     is the data type used for minor tokens given
  42 **                       directly to the parser from the tokenizer.
  43 **    YYMINORTYPE        is the data type used for all minor tokens.
  44 **                       This is typically a union of many types, one of
  45 **                       which is ParseTOKENTYPE.  The entry in the union
  46 **                       for base tokens is called "yy0".
  47 **    YYSTACKDEPTH       is the maximum depth of the parser's stack.
  48 **    ParseARG_SDECL     A static variable declaration for the %extra_argument
  49 **    ParseARG_PDECL     A parameter declaration for the %extra_argument
  50 **    ParseARG_STORE     Code to store %extra_argument into yypParser
  51 **    ParseARG_FETCH     Code to extract %extra_argument from yypParser
  52 **    YYNSTATE           the combined number of states.
  53 **    YYNRULE            the number of rules in the grammar
  54 **    YYERRORSYMBOL      is the code number of the error symbol.  If not
  55 **                       defined, then do no error processing.
  56 */
  57 %%
  58 #define YY_NO_ACTION      (YYNSTATE+YYNRULE+2)
  59 #define YY_ACCEPT_ACTION  (YYNSTATE+YYNRULE+1)
  60 #define YY_ERROR_ACTION   (YYNSTATE+YYNRULE)
  61
  62 /* Next are that tables used to determine what action to take based on the
  63 ** current state and lookahead token.  These tables are used to implement
  64 ** functions that take a state number and lookahead value and return an
  65 ** action integer.
  66 **
  67 ** Suppose the action integer is N.  Then the action is determined as
  68 ** follows
  69 **
  70 **   0 <= N < YYNSTATE                  Shift N.  That is, push the lookahead
  71 **                                      token onto the stack and goto state N.
  72 **
  73 **   YYNSTATE <= N < YYNSTATE+YYNRULE   Reduce by rule N-YYNSTATE.
  74 **
  75 **   N == YYNSTATE+YYNRULE              A syntax error has occurred.
  76 **
  77 **   N == YYNSTATE+YYNRULE+1            The parser accepts its input.
  78 **
  79 **   N == YYNSTATE+YYNRULE+2            No such action.  Denotes unused
  80 **                                      slots in the yy_action[] table.
  81 **
  82 ** The action table is constructed as a single large table named yy_action[].
  83 ** Given state S and lookahead X, the action is computed as
  84 **
  85 **      yy_action[ yy_shift_ofst[S] + X ]
  86 **
  87 ** If the index value yy_shift_ofst[S]+X is out of range or if the value
  88 ** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X or if yy_shift_ofst[S]
  89 ** is equal to YY_SHIFT_USE_DFLT, it means that the action is not in the table
  90 ** and that yy_default[S] should be used instead.
  91 **
  92 ** The formula above is for computing the action when the lookahead is
  93 ** a terminal symbol.  If the lookahead is a non-terminal (as occurs after
  94 ** a reduce action) then the yy_reduce_ofst[] array is used in place of
  95 ** the yy_shift_ofst[] array and YY_REDUCE_USE_DFLT is used in place of
  96 ** YY_SHIFT_USE_DFLT.
  97 **
  98 ** The following are the tables generated in this section:
  99 **
 100 **  yy_action[]        A single table containing all actions.
 101 **  yy_lookahead[]     A table containing the lookahead for each entry in
 102 **                     yy_action.  Used to detect hash collisions.
 103 **  yy_shift_ofst[]    For each state, the offset into yy_action for
 104 **                     shifting terminals.
 105 **  yy_reduce_ofst[]   For each state, the offset into yy_action for
 106 **                     shifting non-terminals after a reduce.
 107 **  yy_default[]       Default action for each state.
 108 */
 109 %%
 110 #define YY_SZ_ACTTAB (sizeof(yy_action)/sizeof(yy_action[0]))
 111
 112 /* The next table maps tokens into fallback tokens.  If a construct
 113 ** like the following:
 114 **
 115 **      %fallback ID X Y Z.
 116 **
 117 ** appears in the grammer, then ID becomes a fallback token for X, Y,
 118 ** and Z.  Whenever one of the tokens X, Y, or Z is input to the parser
 119 ** but it does not parse, the type of the token is changed to ID and
 120 ** the parse is retried before an error is thrown.
 121 */
 122 #ifdef YYFALLBACK
 123 static const YYCODETYPE yyFallback[] = {
 124 %%
 125 };
 126 #endif /* YYFALLBACK */
 127
 128 /* The following structure represents a single element of the
 129 ** parser's stack.  Information stored includes:
 130 **
 131 **   +  The state number for the parser at this level of the stack.
 132 **
 133 **   +  The value of the token stored at this level of the stack.
 134 **      (In other words, the "major" token.)
 135 **
 136 **   +  The semantic value stored at this level of the stack.  This is
 137 **      the information used by the action routines in the grammar.
 138 **      It is sometimes called the "minor" token.
 139 */
 140 struct yyStackEntry {
 141   int stateno;       /* The state-number */
 142   int major;         /* The major token value.  This is the code
 143                      ** number for the token at this stack level */
 144   YYMINORTYPE minor; /* The user-supplied minor token value.  This
 145                      ** is the value of the token  */
 146 };
 147 typedef struct yyStackEntry yyStackEntry;
 148
 149 /* The state of the parser is completely contained in an instance of
 150 ** the following structure */
 151 struct yyParser {
 152   int yyidx;                    /* Index of top element in stack */
 153   int yyerrcnt;                 /* Shifts left before out of the error */
 154   ParseARG_SDECL                /* A place to hold %extra_argument */
 155   yyStackEntry yystack[YYSTACKDEPTH];  /* The parser's stack */
 156 };
 157 typedef struct yyParser yyParser;
 158
 159 #ifndef NDEBUG
 160 #include <stdio.h>
 161 static FILE *yyTraceFILE = 0;
 162 static char *yyTracePrompt = 0;
 163 #endif /* NDEBUG */
 164
 165 #ifndef NDEBUG
 166 /*
 167 ** Turn parser tracing on by giving a stream to which to write the trace
 168 ** and a prompt to preface each trace message.  Tracing is turned off
 169 ** by making either argument NULL
 170 **
 171 ** Inputs:
 172 ** <ul>
 173 ** <li> A FILE* to which trace output should be written.
 174 **      If NULL, then tracing is turned off.
 175 ** <li> A prefix string written at the beginning of every
 176 **      line of trace output.  If NULL, then tracing is
 177 **      turned off.
 178 ** </ul>
 179 **
 180 ** Outputs:
 181 ** None.
 182 */
 183 void ParseTrace(FILE *TraceFILE, char *zTracePrompt){
 184   yyTraceFILE = TraceFILE;
 185   yyTracePrompt = zTracePrompt;
 186   if( yyTraceFILE==0 ) yyTracePrompt = 0;
 187   else if( yyTracePrompt==0 ) yyTraceFILE = 0;
 188 }
 189 #endif /* NDEBUG */
 190
 191 #ifndef NDEBUG
 192 /* For tracing shifts, the names of all terminals and nonterminals
 193 ** are required.  The following table supplies these names */
 194 static const char *const yyTokenName[] = {
 195 %%
 196 };
 197 #endif /* NDEBUG */
 198
 199 #ifndef NDEBUG
 200 /* For tracing reduce actions, the names of all rules are required.
 201 */
 202 static const char *const yyRuleName[] = {
 203 %%
 204 };
 205 #endif /* NDEBUG */
 206
 207 /*
 208 ** This function returns the symbolic name associated with a token
 209 ** value.
 210 */
 211 const char *ParseTokenName(int tokenType){
 212 #ifndef NDEBUG
 213   if( tokenType>0 && tokenType<(sizeof(yyTokenName)/sizeof(yyTokenName[0])) ){
 214     return yyTokenName[tokenType];
 215   }else{
 216     return "Unknown";
 217   }
 218 #else
 219   return "";
 220 #endif
 221 }
 222
 223 /*
 224 ** This function allocates a new parser.
 225 ** The only argument is a pointer to a function which works like
 226 ** malloc.
 227 **
 228 ** Inputs:
 229 ** A pointer to the function used to allocate memory.
 230 **
 231 ** Outputs:
 232 ** A pointer to a parser.  This pointer is used in subsequent calls
 233 ** to Parse and ParseFree.
 234 */
 235 void *ParseAlloc(void *(*mallocProc)(size_t)){
 236   yyParser *pParser;
 237   pParser = (yyParser*)(*mallocProc)( (size_t)sizeof(yyParser) );
 238   if( pParser ){
 239     pParser->yyidx = -1;
 240   }
 241   return pParser;
 242 }
 243
 244 /* The following function deletes the value associated with a
 245 ** symbol.  The symbol can be either a terminal or nonterminal.
 246 ** "yymajor" is the symbol code, and "yypminor" is a pointer to
 247 ** the value.
 248 */
 249 static void yy_destructor(YYCODETYPE yymajor, YYMINORTYPE *yypminor){
 250   switch( yymajor ){
 251     /* Here is inserted the actions which take place when a
 252     ** terminal or non-terminal is destroyed.  This can happen
 253     ** when the symbol is popped from the stack during a
 254     ** reduce or during error processing or when a parser is
 255     ** being destroyed before it is finished parsing.
 256     **
 257     ** Note: during a reduce, the only symbols destroyed are those
 258     ** which appear on the RHS of the rule, but which are not used
 259     ** inside the C code.
 260     */
 261 %%
 262     default:  break;   /* If no destructor action specified: do nothing */
 263   }
 264 }
 265
 266 /*
 267 ** Pop the parser's stack once.
 268 **
 269 ** If there is a destructor routine associated with the token which
 270 ** is popped from the stack, then call it.
 271 **
 272 ** Return the major token number for the symbol popped.
 273 */
 274 static int yy_pop_parser_stack(yyParser *pParser){
 275   YYCODETYPE yymajor;
 276   yyStackEntry *yytos = &pParser->yystack[pParser->yyidx];
 277
 278   if( pParser->yyidx<0 ) return 0;
 279 #ifndef NDEBUG
 280   if( yyTraceFILE && pParser->yyidx>=0 ){
 281     fprintf(yyTraceFILE,"%sPopping %s\n",
 282       yyTracePrompt,
 283       yyTokenName[yytos->major]);
 284   }
 285 #endif
 286   yymajor = yytos->major;
 287   yy_destructor( yymajor, &yytos->minor);
 288   pParser->yyidx--;
 289   return yymajor;
 290 }
 291
 292 /*
 293 ** Deallocate and destroy a parser.  Destructors are all called for
 294 ** all stack elements before shutting the parser down.
 295 **
 296 ** Inputs:
 297 ** <ul>
 298 ** <li>  A pointer to the parser.  This should be a pointer
 299 **       obtained from ParseAlloc.
 300 ** <li>  A pointer to a function used to reclaim memory obtained
 301 **       from malloc.
 302 ** </ul>
 303 */
 304 void ParseFree(
 305   void *p,                    /* The parser to be deleted */
 306   void (*freeProc)(void*)     /* Function used to reclaim memory */
 307 ){
 308   yyParser *pParser = (yyParser*)p;
 309   if( pParser==0 ) return;
 310   while( pParser->yyidx>=0 ) yy_pop_parser_stack(pParser);
 311   (*freeProc)((void*)pParser);
 312 }
 313
 314 /*
 315 ** Find the appropriate action for a parser given the terminal
 316 ** look-ahead token iLookAhead.
 317 **
 318 ** If the look-ahead token is YYNOCODE, then check to see if the action is
 319 ** independent of the look-ahead.  If it is, return the action, otherwise
 320 ** return YY_NO_ACTION.
 321 */
 322 static int yy_find_shift_action(
 323   yyParser *pParser,        /* The parser */
 324   int iLookAhead            /* The look-ahead token */
 325 ){
 326   int i;
 327   int stateno = pParser->yystack[pParser->yyidx].stateno;
 328
 329   /* if( pParser->yyidx<0 ) return YY_NO_ACTION;  */
 330   i = yy_shift_ofst[stateno];
 331   if( i==YY_SHIFT_USE_DFLT ){
 332     return yy_default[stateno];
 333   }
 334   if( iLookAhead==YYNOCODE ){
 335     return YY_NO_ACTION;
 336   }
 337   i += iLookAhead;
 338   if( i<0 || i>=YY_SZ_ACTTAB || yy_lookahead[i]!=iLookAhead ){
 339 #ifdef YYFALLBACK
 340     int iFallback;            /* Fallback token */
 341     if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0])
 342            && (iFallback = yyFallback[iLookAhead])!=0 ){
 343 #ifndef NDEBUG
 344       if( yyTraceFILE ){
 345         fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
 346            yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
 347       }
 348 #endif
 349       return yy_find_shift_action(pParser, iFallback);
 350     }
 351 #endif
 352     return yy_default[stateno];
 353   }else{
 354     return yy_action[i];
 355   }
 356 }
 357
 358 /*
 359 ** Find the appropriate action for a parser given the non-terminal
 360 ** look-ahead token iLookAhead.
 361 **
 362 ** If the look-ahead token is YYNOCODE, then check to see if the action is
 363 ** independent of the look-ahead.  If it is, return the action, otherwise
 364 ** return YY_NO_ACTION.
 365 */
 366 static int yy_find_reduce_action(
 367   int stateno,              /* Current state number */
 368   int iLookAhead            /* The look-ahead token */
 369 ){
 370   int i;
 371   /* int stateno = pParser->yystack[pParser->yyidx].stateno; */
 372
 373   i = yy_reduce_ofst[stateno];
 374   if( i==YY_REDUCE_USE_DFLT ){
 375     return yy_default[stateno];
 376   }
 377   if( iLookAhead==YYNOCODE ){
 378     return YY_NO_ACTION;
 379   }
 380   i += iLookAhead;
 381   if( i<0 || i>=YY_SZ_ACTTAB || yy_lookahead[i]!=iLookAhead ){
 382     return yy_default[stateno];
 383   }else{
 384     return yy_action[i];
 385   }
 386 }
 387
 388 /*
 389 ** Perform a shift action.
 390 */
 391 static void yy_shift(
 392   yyParser *yypParser,          /* The parser to be shifted */
 393   int yyNewState,               /* The new state to shift in */
 394   int yyMajor,                  /* The major token to shift in */
 395   YYMINORTYPE *yypMinor         /* Pointer ot the minor token to shift in */
 396 ){
 397   yyStackEntry *yytos;
 398   yypParser->yyidx++;
 399   if( yypParser->yyidx>=YYSTACKDEPTH ){
 400      ParseARG_FETCH;
 401      yypParser->yyidx--;
 402 #ifndef NDEBUG
 403      if( yyTraceFILE ){
 404        fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
 405      }
 406 #endif
 407      while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
 408      /* Here code is inserted which will execute if the parser
 409      ** stack every overflows */
 410 %%
 411      ParseARG_STORE; /* Suppress warning about unused %extra_argument var */
 412      return;
 413   }
 414   yytos = &yypParser->yystack[yypParser->yyidx];
 415   yytos->stateno = yyNewState;
 416   yytos->major = yyMajor;
 417   yytos->minor = *yypMinor;
 418 #ifndef NDEBUG
 419   if( yyTraceFILE && yypParser->yyidx>0 ){
 420     int i;
 421     fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
 422     fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
 423     for(i=1; i<=yypParser->yyidx; i++)
 424       fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
 425     fprintf(yyTraceFILE,"\n");
 426   }
 427 #endif
 428 }
 429
 430 /* The following table contains information about every rule that
 431 ** is used during the reduce.
 432 */
 433 static const struct {
 434   YYCODETYPE lhs;         /* Symbol on the left-hand side of the rule */
 435   unsigned char nrhs;     /* Number of right-hand side symbols in the rule */
 436 } yyRuleInfo[] = {
 437 %%
 438 };
 439
 440 static void yy_accept(yyParser*);  /* Forward Declaration */
 441
 442 /*
 443 ** Perform a reduce action and the shift that must immediately
 444 ** follow the reduce.
 445 */
 446 static void yy_reduce(
 447   yyParser *yypParser,         /* The parser */
 448   int yyruleno                 /* Number of the rule by which to reduce */
 449 ){
 450   int yygoto;                     /* The next state */
 451   int yyact;                      /* The next action */
 452   YYMINORTYPE yygotominor;        /* The LHS of the rule reduced */
 453   yyStackEntry *yymsp;            /* The top of the parser's stack */
 454   int yysize;                     /* Amount to pop the stack */
 455   ParseARG_FETCH;
 456   yymsp = &yypParser->yystack[yypParser->yyidx];
 457 #ifndef NDEBUG
 458   if( yyTraceFILE && yyruleno>=0
 459         && yyruleno<sizeof(yyRuleName)/sizeof(yyRuleName[0]) ){
 460     fprintf(yyTraceFILE, "%sReduce [%s].\n", yyTracePrompt,
 461       yyRuleName[yyruleno]);
 462   }
 463 #endif /* NDEBUG */
 464
 465 #ifndef NDEBUG
 466   /* Silence complaints from purify about yygotominor being uninitialized
 467   ** in some cases when it is copied into the stack after the following
 468   ** switch.  yygotominor is uninitialized when a rule reduces that does
 469   ** not set the value of its left-hand side nonterminal.  Leaving the
 470   ** value of the nonterminal uninitialized is utterly harmless as long
 471   ** as the value is never used.  So really the only thing this code
 472   ** accomplishes is to quieten purify.
 473   */
 474   memset(&yygotominor, 0, sizeof(yygotominor));
 475 #endif
 476
 477   switch( yyruleno ){
 478   /* Beginning here are the reduction cases.  A typical example
 479   ** follows:
 480   **   case 0:
 481   **  #line <lineno> <grammarfile>
 482   **     { ... }           // User supplied code
 483   **  #line <lineno> <thisfile>
 484   **     break;
 485   */
 486 %%
 487   };
 488   yygoto = yyRuleInfo[yyruleno].lhs;
 489   yysize = yyRuleInfo[yyruleno].nrhs;
 490   yypParser->yyidx -= yysize;
 491   yyact = yy_find_reduce_action(yymsp[-yysize].stateno,yygoto);
 492   if( yyact < YYNSTATE ){
 493 #ifdef NDEBUG
 494     /* If we are not debugging and the reduce action popped at least
 495     ** one element off the stack, then we can push the new element back
 496     ** onto the stack here, and skip the stack overflow test in yy_shift().
 497     ** That gives a significant speed improvement. */
 498     if( yysize ){
 499       yypParser->yyidx++;
 500       yymsp -= yysize-1;
 501       yymsp->stateno = yyact;
 502       yymsp->major = yygoto;
 503       yymsp->minor = yygotominor;
 504     }else
 505 #endif
 506     {
 507       yy_shift(yypParser,yyact,yygoto,&yygotominor);
 508     }
 509   }else if( yyact == YYNSTATE + YYNRULE + 1 ){
 510     yy_accept(yypParser);
 511   }
 512 }
 513
 514 /*
 515 ** The following code executes when the parse fails
 516 */
 517 static void yy_parse_failed(
 518   yyParser *yypParser           /* The parser */
 519 ){
 520   ParseARG_FETCH;
 521 #ifndef NDEBUG
 522   if( yyTraceFILE ){
 523     fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
 524   }
 525 #endif
 526   while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
 527   /* Here code is inserted which will be executed whenever the
 528   ** parser fails */
 529 %%
 530   ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
 531 }
 532
 533 /*
 534 ** The following code executes when a syntax error first occurs.
 535 */
 536 static void yy_syntax_error(
 537   yyParser *yypParser,           /* The parser */
 538   int yymajor,                   /* The major type of the error token */
 539   YYMINORTYPE yyminor            /* The minor type of the error token */
 540 ){
 541   ParseARG_FETCH;
 542 #define TOKEN (yyminor.yy0)
 543 %%
 544   ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
 545 }
 546
 547 /*
 548 ** The following is executed when the parser accepts
 549 */
 550 static void yy_accept(
 551   yyParser *yypParser           /* The parser */
 552 ){
 553   ParseARG_FETCH;
 554 #ifndef NDEBUG
 555   if( yyTraceFILE ){
 556     fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
 557   }
 558 #endif
 559   while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
 560   /* Here code is inserted which will be executed whenever the
 561   ** parser accepts */
 562 %%
 563   ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
 564 }
 565
 566 /* The main parser program.
 567 ** The first argument is a pointer to a structure obtained from
 568 ** "ParseAlloc" which describes the current state of the parser.
 569 ** The second argument is the major token number.  The third is
 570 ** the minor token.  The fourth optional argument is whatever the
 571 ** user wants (and specified in the grammar) and is available for
 572 ** use by the action routines.
 573 **
 574 ** Inputs:
 575 ** <ul>
 576 ** <li> A pointer to the parser (an opaque structure.)
 577 ** <li> The major token number.
 578 ** <li> The minor token number.
 579 ** <li> An option argument of a grammar-specified type.
 580 ** </ul>
 581 **
 582 ** Outputs:
 583 ** None.
 584 */
 585 void Parse(
 586   void *yyp,                   /* The parser */
 587   int yymajor,                 /* The major token code number */
 588   ParseTOKENTYPE yyminor       /* The value for the token */
 589   ParseARG_PDECL               /* Optional %extra_argument parameter */
 590 ){
 591   YYMINORTYPE yyminorunion;
 592   int yyact;            /* The parser action. */
 593   int yyendofinput;     /* True if we are at the end of input */
 594   int yyerrorhit = 0;   /* True if yymajor has invoked an error */
 595   yyParser *yypParser;  /* The parser */
 596
 597   /* (re)initialize the parser, if necessary */
 598   yypParser = (yyParser*)yyp;
 599   if( yypParser->yyidx<0 ){
 600     /* if( yymajor==0 ) return; // not sure why this was here... */
 601     yypParser->yyidx = 0;
 602     yypParser->yyerrcnt = -1;
 603     yypParser->yystack[0].stateno = 0;
 604     yypParser->yystack[0].major = 0;
 605   }
 606   yyminorunion.yy0 = yyminor;
 607   yyendofinput = (yymajor==0);
 608   ParseARG_STORE;
 609
 610 #ifndef NDEBUG
 611   if( yyTraceFILE ){
 612     fprintf(yyTraceFILE,"%sInput %s\n",yyTracePrompt,yyTokenName[yymajor]);
 613   }
 614 #endif
 615
 616   do{
 617     yyact = yy_find_shift_action(yypParser,yymajor);
 618     if( yyact<YYNSTATE ){
 619       yy_shift(yypParser,yyact,yymajor,&yyminorunion);
 620       yypParser->yyerrcnt--;
 621       if( yyendofinput && yypParser->yyidx>=0 ){
 622         yymajor = 0;
 623       }else{
 624         yymajor = YYNOCODE;
 625       }
 626     }else if( yyact < YYNSTATE + YYNRULE ){
 627       yy_reduce(yypParser,yyact-YYNSTATE);
 628     }else if( yyact == YY_ERROR_ACTION ){
 629       int yymx;
 630 #ifndef NDEBUG
 631       if( yyTraceFILE ){
 632         fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt);
 633       }
 634 #endif
 635 #ifdef YYERRORSYMBOL
 636       /* A syntax error has occurred.
 637       ** The response to an error depends upon whether or not the
 638       ** grammar defines an error token "ERROR".
 639       **
 640       ** This is what we do if the grammar does define ERROR:
 641       **
 642       **  * Call the %syntax_error function.
 643       **
 644       **  * Begin popping the stack until we enter a state where
 645       **    it is legal to shift the error symbol, then shift
 646       **    the error symbol.
 647       **
 648       **  * Set the error count to three.
 649       **
 650       **  * Begin accepting and shifting new tokens.  No new error
 651       **    processing will occur until three tokens have been
 652       **    shifted successfully.
 653       **
 654       */
 655       if( yypParser->yyerrcnt<0 ){
 656         yy_syntax_error(yypParser,yymajor,yyminorunion);
 657       }
 658       yymx = yypParser->yystack[yypParser->yyidx].major;
 659       if( yymx==YYERRORSYMBOL || yyerrorhit ){
 660 #ifndef NDEBUG
 661         if( yyTraceFILE ){
 662           fprintf(yyTraceFILE,"%sDiscard input token %s\n",
 663              yyTracePrompt,yyTokenName[yymajor]);
 664         }
 665 #endif
 666         yy_destructor(yymajor,&yyminorunion);
 667         yymajor = YYNOCODE;
 668       }else{
 669          while(
 670           yypParser->yyidx >= 0 &&
 671           yymx != YYERRORSYMBOL &&
 672           (yyact = yy_find_shift_action(yypParser,YYERRORSYMBOL)) >= YYNSTATE
 673         ){
 674           yy_pop_parser_stack(yypParser);
 675         }
 676         if( yypParser->yyidx < 0 || yymajor==0 ){
 677           yy_destructor(yymajor,&yyminorunion);
 678           yy_parse_failed(yypParser);
 679           yymajor = YYNOCODE;
 680         }else if( yymx!=YYERRORSYMBOL ){
 681           YYMINORTYPE u2;
 682           u2.YYERRSYMDT = 0;
 683           yy_shift(yypParser,yyact,YYERRORSYMBOL,&u2);
 684         }
 685       }
 686       yypParser->yyerrcnt = 3;
 687       yyerrorhit = 1;
 688 #else  /* YYERRORSYMBOL is not defined */
 689       /* This is what we do if the grammar does not define ERROR:
 690       **
 691       **  * Report an error message, and throw away the input token.
 692       **
 693       **  * If the input token is $, then fail the parse.
 694       **
 695       ** As before, subsequent error messages are suppressed until
 696       ** three input tokens have been successfully shifted.
 697       */
 698       if( yypParser->yyerrcnt<=0 ){
 699         yy_syntax_error(yypParser,yymajor,yyminorunion);
 700       }
 701       yypParser->yyerrcnt = 3;
 702       yy_destructor(yymajor,&yyminorunion);
 703       if( yyendofinput ){
 704         yy_parse_failed(yypParser);
 705       }
 706       yymajor = YYNOCODE;
 707 #endif
 708     }else{
 709       yy_accept(yypParser);
 710       yymajor = YYNOCODE;
 711     }
 712   }while( yymajor!=YYNOCODE && yypParser->yyidx>=0 );
 713   return;
 714 }