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1 /* Driver template for the LEMON parser generator.
2 ** The author disclaims copyright to this source code.
3 **
4 ** This version of "lempar.c" is modified, slightly, for use by SQLite.
5 ** The only modifications are the addition of a couple of NEVER()
6 ** macros to disable tests that are needed in the case of a general
7 ** LALR(1) grammar but which are always false in the
8 ** specific grammar used by SQLite.
9 */
10 /* First off, code is included that follows the "include" declaration
11 ** in the input grammar file. */
12 #include <stdio.h>
14 /* Next is all token values, in a form suitable for use by makeheaders.
15 ** This section will be null unless lemon is run with the -m switch.
17 /*
18 ** These constants (all generated automatically by the parser generator)
19 ** specify the various kinds of tokens (terminals) that the parser
20 ** understands.
22 ** Each symbol here is a terminal symbol in the grammar.
25 /* Make sure the INTERFACE macro is defined.
27 #ifndef INTERFACE
28 # define INTERFACE 1
29 #endif
30 /* The next thing included is series of defines which control
31 ** various aspects of the generated parser.
32 ** YYCODETYPE is the data type used for storing terminal
33 ** and nonterminal numbers. "unsigned char" is
34 ** used if there are fewer than 250 terminals
35 ** and nonterminals. "int" is used otherwise.
36 ** YYNOCODE is a number of type YYCODETYPE which corresponds
37 ** to no legal terminal or nonterminal number. This
38 ** number is used to fill in empty slots of the hash
39 ** table.
40 ** YYFALLBACK If defined, this indicates that one or more tokens
41 ** have fall-back values which should be used if the
42 ** original value of the token will not parse.
43 ** YYACTIONTYPE is the data type used for storing terminal
44 ** and nonterminal numbers. "unsigned char" is
45 ** used if there are fewer than 250 rules and
46 ** states combined. "int" is used otherwise.
47 ** ParseTOKENTYPE is the data type used for minor tokens given
48 ** directly to the parser from the tokenizer.
49 ** YYMINORTYPE is the data type used for all minor tokens.
50 ** This is typically a union of many types, one of
51 ** which is ParseTOKENTYPE. The entry in the union
52 ** for base tokens is called "yy0".
53 ** YYSTACKDEPTH is the maximum depth of the parser's stack. If
54 ** zero the stack is dynamically sized using realloc()
55 ** ParseARG_SDECL A static variable declaration for the %extra_argument
56 ** ParseARG_PDECL A parameter declaration for the %extra_argument
57 ** ParseARG_STORE Code to store %extra_argument into yypParser
58 ** ParseARG_FETCH Code to extract %extra_argument from yypParser
59 ** YYNSTATE the combined number of states.
60 ** YYNRULE the number of rules in the grammar
61 ** YYERRORSYMBOL is the code number of the error symbol. If not
62 ** defined, then do no error processing.
65 #define YY_NO_ACTION (YYNSTATE+YYNRULE+2)
66 #define YY_ACCEPT_ACTION (YYNSTATE+YYNRULE+1)
67 #define YY_ERROR_ACTION (YYNSTATE+YYNRULE)
69 /* The yyzerominor constant is used to initialize instances of
70 ** YYMINORTYPE objects to zero. */
71 static const YYMINORTYPE yyzerominor = { 0 };
73 /* Define the yytestcase() macro to be a no-op if is not already defined
74 ** otherwise.
76 ** Applications can choose to define yytestcase() in the %include section
77 ** to a macro that can assist in verifying code coverage. For production
78 ** code the yytestcase() macro should be turned off. But it is useful
79 ** for testing.
81 #ifndef yytestcase
82 # define yytestcase(X)
83 #endif
86 /* Next are the tables used to determine what action to take based on the
87 ** current state and lookahead token. These tables are used to implement
88 ** functions that take a state number and lookahead value and return an
89 ** action integer.
91 ** Suppose the action integer is N. Then the action is determined as
92 ** follows
94 ** 0 <= N < YYNSTATE Shift N. That is, push the lookahead
95 ** token onto the stack and goto state N.
97 ** YYNSTATE <= N < YYNSTATE+YYNRULE Reduce by rule N-YYNSTATE.
99 ** N == YYNSTATE+YYNRULE A syntax error has occurred.
101 ** N == YYNSTATE+YYNRULE+1 The parser accepts its input.
103 ** N == YYNSTATE+YYNRULE+2 No such action. Denotes unused
104 ** slots in the yy_action[] table.
106 ** The action table is constructed as a single large table named yy_action[].
107 ** Given state S and lookahead X, the action is computed as
109 ** yy_action[ yy_shift_ofst[S] + X ]
111 ** If the index value yy_shift_ofst[S]+X is out of range or if the value
112 ** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X or if yy_shift_ofst[S]
113 ** is equal to YY_SHIFT_USE_DFLT, it means that the action is not in the table
114 ** and that yy_default[S] should be used instead.
116 ** The formula above is for computing the action when the lookahead is
117 ** a terminal symbol. If the lookahead is a non-terminal (as occurs after
118 ** a reduce action) then the yy_reduce_ofst[] array is used in place of
119 ** the yy_shift_ofst[] array and YY_REDUCE_USE_DFLT is used in place of
120 ** YY_SHIFT_USE_DFLT.
122 ** The following are the tables generated in this section:
124 ** yy_action[] A single table containing all actions.
125 ** yy_lookahead[] A table containing the lookahead for each entry in
126 ** yy_action. Used to detect hash collisions.
127 ** yy_shift_ofst[] For each state, the offset into yy_action for
128 ** shifting terminals.
129 ** yy_reduce_ofst[] For each state, the offset into yy_action for
130 ** shifting non-terminals after a reduce.
131 ** yy_default[] Default action for each state.
135 /* The next table maps tokens into fallback tokens. If a construct
136 ** like the following:
138 ** %fallback ID X Y Z.
140 ** appears in the grammar, then ID becomes a fallback token for X, Y,
141 ** and Z. Whenever one of the tokens X, Y, or Z is input to the parser
142 ** but it does not parse, the type of the token is changed to ID and
143 ** the parse is retried before an error is thrown.
145 #ifdef YYFALLBACK
146 static const YYCODETYPE yyFallback[] = {
149 #endif /* YYFALLBACK */
151 /* The following structure represents a single element of the
152 ** parser's stack. Information stored includes:
154 ** + The state number for the parser at this level of the stack.
156 ** + The value of the token stored at this level of the stack.
157 ** (In other words, the "major" token.)
159 ** + The semantic value stored at this level of the stack. This is
160 ** the information used by the action routines in the grammar.
161 ** It is sometimes called the "minor" token.
163 struct yyStackEntry {
164 YYACTIONTYPE stateno; /* The state-number */
165 YYCODETYPE major; /* The major token value. This is the code
166 ** number for the token at this stack level */
167 YYMINORTYPE minor; /* The user-supplied minor token value. This
168 ** is the value of the token */
170 typedef struct yyStackEntry yyStackEntry;
172 /* The state of the parser is completely contained in an instance of
173 ** the following structure */
174 struct yyParser {
175 int yyidx; /* Index of top element in stack */
176 #ifdef YYTRACKMAXSTACKDEPTH
177 int yyidxMax; /* Maximum value of yyidx */
178 #endif
179 int yyerrcnt; /* Shifts left before out of the error */
180 ParseARG_SDECL /* A place to hold %extra_argument */
181 #if YYSTACKDEPTH<=0
182 int yystksz; /* Current side of the stack */
183 yyStackEntry *yystack; /* The parser's stack */
184 #else
185 yyStackEntry yystack[YYSTACKDEPTH]; /* The parser's stack */
186 #endif
188 typedef struct yyParser yyParser;
190 #ifndef NDEBUG
191 #include <stdio.h>
192 static FILE *yyTraceFILE = 0;
193 static char *yyTracePrompt = 0;
194 #endif /* NDEBUG */
196 #ifndef NDEBUG
198 ** Turn parser tracing on by giving a stream to which to write the trace
199 ** and a prompt to preface each trace message. Tracing is turned off
200 ** by making either argument NULL
202 ** Inputs:
203 ** <ul>
204 ** <li> A FILE* to which trace output should be written.
205 ** If NULL, then tracing is turned off.
206 ** <li> A prefix string written at the beginning of every
207 ** line of trace output. If NULL, then tracing is
208 ** turned off.
209 ** </ul>
211 ** Outputs:
212 ** None.
214 void ParseTrace(FILE *TraceFILE, char *zTracePrompt){
215 yyTraceFILE = TraceFILE;
216 yyTracePrompt = zTracePrompt;
217 if( yyTraceFILE==0 ) yyTracePrompt = 0;
218 else if( yyTracePrompt==0 ) yyTraceFILE = 0;
220 #endif /* NDEBUG */
222 #ifndef NDEBUG
223 /* For tracing shifts, the names of all terminals and nonterminals
224 ** are required. The following table supplies these names */
225 static const char *const yyTokenName[] = {
228 #endif /* NDEBUG */
230 #ifndef NDEBUG
231 /* For tracing reduce actions, the names of all rules are required.
233 static const char *const yyRuleName[] = {
236 #endif /* NDEBUG */
239 #if YYSTACKDEPTH<=0
241 ** Try to increase the size of the parser stack.
243 static void yyGrowStack(yyParser *p){
244 int newSize;
245 yyStackEntry *pNew;
247 newSize = p->yystksz*2 + 100;
248 pNew = realloc(p->yystack, newSize*sizeof(pNew[0]));
249 if( pNew ){
250 p->yystack = pNew;
251 p->yystksz = newSize;
252 #ifndef NDEBUG
253 if( yyTraceFILE ){
254 fprintf(yyTraceFILE,"%sStack grows to %d entries!\n",
255 yyTracePrompt, p->yystksz);
257 #endif
260 #endif
263 ** This function allocates a new parser.
264 ** The only argument is a pointer to a function which works like
265 ** malloc.
267 ** Inputs:
268 ** A pointer to the function used to allocate memory.
270 ** Outputs:
271 ** A pointer to a parser. This pointer is used in subsequent calls
272 ** to Parse and ParseFree.
274 void *ParseAlloc(void *(*mallocProc)(u64)){
275 yyParser *pParser;
276 pParser = (yyParser*)(*mallocProc)( (u64)sizeof(yyParser) );
277 if( pParser ){
278 pParser->yyidx = -1;
279 #ifdef YYTRACKMAXSTACKDEPTH
280 pParser->yyidxMax = 0;
281 #endif
282 #if YYSTACKDEPTH<=0
283 pParser->yystack = NULL;
284 pParser->yystksz = 0;
285 yyGrowStack(pParser);
286 #endif
288 return pParser;
291 /* The following function deletes the value associated with a
292 ** symbol. The symbol can be either a terminal or nonterminal.
293 ** "yymajor" is the symbol code, and "yypminor" is a pointer to
294 ** the value.
296 static void yy_destructor(
297 yyParser *yypParser, /* The parser */
298 YYCODETYPE yymajor, /* Type code for object to destroy */
299 YYMINORTYPE *yypminor /* The object to be destroyed */
301 ParseARG_FETCH;
302 switch( yymajor ){
303 /* Here is inserted the actions which take place when a
304 ** terminal or non-terminal is destroyed. This can happen
305 ** when the symbol is popped from the stack during a
306 ** reduce or during error processing or when a parser is
307 ** being destroyed before it is finished parsing.
309 ** Note: during a reduce, the only symbols destroyed are those
310 ** which appear on the RHS of the rule, but which are not used
311 ** inside the C code.
314 default: break; /* If no destructor action specified: do nothing */
319 ** Pop the parser's stack once.
321 ** If there is a destructor routine associated with the token which
322 ** is popped from the stack, then call it.
324 ** Return the major token number for the symbol popped.
326 static int yy_pop_parser_stack(yyParser *pParser){
327 YYCODETYPE yymajor;
328 yyStackEntry *yytos = &pParser->yystack[pParser->yyidx];
330 /* There is no mechanism by which the parser stack can be popped below
331 ** empty in SQLite. */
332 if( NEVER(pParser->yyidx<0) ) return 0;
333 #ifndef NDEBUG
334 if( yyTraceFILE && pParser->yyidx>=0 ){
335 fprintf(yyTraceFILE,"%sPopping %s\n",
336 yyTracePrompt,
337 yyTokenName[yytos->major]);
339 #endif
340 yymajor = yytos->major;
341 yy_destructor(pParser, yymajor, &yytos->minor);
342 pParser->yyidx--;
343 return yymajor;
347 ** Deallocate and destroy a parser. Destructors are all called for
348 ** all stack elements before shutting the parser down.
350 ** Inputs:
351 ** <ul>
352 ** <li> A pointer to the parser. This should be a pointer
353 ** obtained from ParseAlloc.
354 ** <li> A pointer to a function used to reclaim memory obtained
355 ** from malloc.
356 ** </ul>
358 void ParseFree(
359 void *p, /* The parser to be deleted */
360 void (*freeProc)(void*) /* Function used to reclaim memory */
362 yyParser *pParser = (yyParser*)p;
363 /* In SQLite, we never try to destroy a parser that was not successfully
364 ** created in the first place. */
365 if( NEVER(pParser==0) ) return;
366 while( pParser->yyidx>=0 ) yy_pop_parser_stack(pParser);
367 #if YYSTACKDEPTH<=0
368 free(pParser->yystack);
369 #endif
370 (*freeProc)((void*)pParser);
374 ** Return the peak depth of the stack for a parser.
376 #ifdef YYTRACKMAXSTACKDEPTH
377 int ParseStackPeak(void *p){
378 yyParser *pParser = (yyParser*)p;
379 return pParser->yyidxMax;
381 #endif
384 ** Find the appropriate action for a parser given the terminal
385 ** look-ahead token iLookAhead.
387 ** If the look-ahead token is YYNOCODE, then check to see if the action is
388 ** independent of the look-ahead. If it is, return the action, otherwise
389 ** return YY_NO_ACTION.
391 static int yy_find_shift_action(
392 yyParser *pParser, /* The parser */
393 YYCODETYPE iLookAhead /* The look-ahead token */
395 int i;
396 int stateno = pParser->yystack[pParser->yyidx].stateno;
398 if( stateno>YY_SHIFT_COUNT
399 || (i = yy_shift_ofst[stateno])==YY_SHIFT_USE_DFLT ){
400 return yy_default[stateno];
402 assert( iLookAhead!=YYNOCODE );
403 i += iLookAhead;
404 if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
405 if( iLookAhead>0 ){
406 #ifdef YYFALLBACK
407 YYCODETYPE iFallback; /* Fallback token */
408 if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0])
409 && (iFallback = yyFallback[iLookAhead])!=0 ){
410 #ifndef NDEBUG
411 if( yyTraceFILE ){
412 fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
413 yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
415 #endif
416 return yy_find_shift_action(pParser, iFallback);
418 #endif
419 #ifdef YYWILDCARD
421 int j = i - iLookAhead + YYWILDCARD;
422 if(
423 #if YY_SHIFT_MIN+YYWILDCARD<0
424 j>=0 &&
425 #endif
426 #if YY_SHIFT_MAX+YYWILDCARD>=YY_ACTTAB_COUNT
427 j<YY_ACTTAB_COUNT &&
428 #endif
429 yy_lookahead[j]==YYWILDCARD
431 #ifndef NDEBUG
432 if( yyTraceFILE ){
433 fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
434 yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[YYWILDCARD]);
436 #endif /* NDEBUG */
437 return yy_action[j];
440 #endif /* YYWILDCARD */
442 return yy_default[stateno];
443 }else{
444 return yy_action[i];
449 ** Find the appropriate action for a parser given the non-terminal
450 ** look-ahead token iLookAhead.
452 ** If the look-ahead token is YYNOCODE, then check to see if the action is
453 ** independent of the look-ahead. If it is, return the action, otherwise
454 ** return YY_NO_ACTION.
456 static int yy_find_reduce_action(
457 int stateno, /* Current state number */
458 YYCODETYPE iLookAhead /* The look-ahead token */
460 int i;
461 #ifdef YYERRORSYMBOL
462 if( stateno>YY_REDUCE_COUNT ){
463 return yy_default[stateno];
465 #else
466 assert( stateno<=YY_REDUCE_COUNT );
467 #endif
468 i = yy_reduce_ofst[stateno];
469 assert( i!=YY_REDUCE_USE_DFLT );
470 assert( iLookAhead!=YYNOCODE );
471 i += iLookAhead;
472 #ifdef YYERRORSYMBOL
473 if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
474 return yy_default[stateno];
476 #else
477 assert( i>=0 && i<YY_ACTTAB_COUNT );
478 assert( yy_lookahead[i]==iLookAhead );
479 #endif
480 return yy_action[i];
484 ** The following routine is called if the stack overflows.
486 static void yyStackOverflow(yyParser *yypParser, YYMINORTYPE *yypMinor){
487 ParseARG_FETCH;
488 yypParser->yyidx--;
489 #ifndef NDEBUG
490 if( yyTraceFILE ){
491 fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
493 #endif
494 while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
495 /* Here code is inserted which will execute if the parser
496 ** stack every overflows */
498 ParseARG_STORE; /* Suppress warning about unused %extra_argument var */
502 ** Perform a shift action.
504 static void yy_shift(
505 yyParser *yypParser, /* The parser to be shifted */
506 int yyNewState, /* The new state to shift in */
507 int yyMajor, /* The major token to shift in */
508 YYMINORTYPE *yypMinor /* Pointer to the minor token to shift in */
510 yyStackEntry *yytos;
511 yypParser->yyidx++;
512 #ifdef YYTRACKMAXSTACKDEPTH
513 if( yypParser->yyidx>yypParser->yyidxMax ){
514 yypParser->yyidxMax = yypParser->yyidx;
516 #endif
517 #if YYSTACKDEPTH>0
518 if( yypParser->yyidx>=YYSTACKDEPTH ){
519 yyStackOverflow(yypParser, yypMinor);
520 return;
522 #else
523 if( yypParser->yyidx>=yypParser->yystksz ){
524 yyGrowStack(yypParser);
525 if( yypParser->yyidx>=yypParser->yystksz ){
526 yyStackOverflow(yypParser, yypMinor);
527 return;
530 #endif
531 yytos = &yypParser->yystack[yypParser->yyidx];
532 yytos->stateno = (YYACTIONTYPE)yyNewState;
533 yytos->major = (YYCODETYPE)yyMajor;
534 yytos->minor = *yypMinor;
535 #ifndef NDEBUG
536 if( yyTraceFILE && yypParser->yyidx>0 ){
537 int i;
538 fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
539 fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
540 for(i=1; i<=yypParser->yyidx; i++)
541 fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
542 fprintf(yyTraceFILE,"\n");
544 #endif
547 /* The following table contains information about every rule that
548 ** is used during the reduce.
550 static const struct {
551 YYCODETYPE lhs; /* Symbol on the left-hand side of the rule */
552 unsigned char nrhs; /* Number of right-hand side symbols in the rule */
553 } yyRuleInfo[] = {
557 static void yy_accept(yyParser*); /* Forward Declaration */
560 ** Perform a reduce action and the shift that must immediately
561 ** follow the reduce.
563 static void yy_reduce(
564 yyParser *yypParser, /* The parser */
565 int yyruleno /* Number of the rule by which to reduce */
567 int yygoto; /* The next state */
568 int yyact; /* The next action */
569 YYMINORTYPE yygotominor; /* The LHS of the rule reduced */
570 yyStackEntry *yymsp; /* The top of the parser's stack */
571 int yysize; /* Amount to pop the stack */
572 ParseARG_FETCH;
573 yymsp = &yypParser->yystack[yypParser->yyidx];
574 #ifndef NDEBUG
575 if( yyTraceFILE && yyruleno>=0
576 && yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) ){
577 fprintf(yyTraceFILE, "%sReduce [%s].\n", yyTracePrompt,
578 yyRuleName[yyruleno]);
580 #endif /* NDEBUG */
582 /* Silence complaints from purify about yygotominor being uninitialized
583 ** in some cases when it is copied into the stack after the following
584 ** switch. yygotominor is uninitialized when a rule reduces that does
585 ** not set the value of its left-hand side nonterminal. Leaving the
586 ** value of the nonterminal uninitialized is utterly harmless as long
587 ** as the value is never used. So really the only thing this code
588 ** accomplishes is to quieten purify.
590 ** 2007-01-16: The wireshark project (www.wireshark.org) reports that
591 ** without this code, their parser segfaults. I'm not sure what there
592 ** parser is doing to make this happen. This is the second bug report
593 ** from wireshark this week. Clearly they are stressing Lemon in ways
594 ** that it has not been previously stressed... (SQLite ticket #2172)
596 /*memset(&yygotominor, 0, sizeof(yygotominor));*/
597 yygotominor = yyzerominor;
600 switch( yyruleno ){
601 /* Beginning here are the reduction cases. A typical example
602 ** follows:
603 ** case 0:
604 ** #line <lineno> <grammarfile>
605 ** { ... } // User supplied code
606 ** #line <lineno> <thisfile>
607 ** break;
611 assert( yyruleno>=0 && yyruleno<sizeof(yyRuleInfo)/sizeof(yyRuleInfo[0]) );
612 yygoto = yyRuleInfo[yyruleno].lhs;
613 yysize = yyRuleInfo[yyruleno].nrhs;
614 yypParser->yyidx -= yysize;
615 yyact = yy_find_reduce_action(yymsp[-yysize].stateno,(YYCODETYPE)yygoto);
616 if( yyact < YYNSTATE ){
617 #ifdef NDEBUG
618 /* If we are not debugging and the reduce action popped at least
619 ** one element off the stack, then we can push the new element back
620 ** onto the stack here, and skip the stack overflow test in yy_shift().
621 ** That gives a significant speed improvement. */
622 if( yysize ){
623 yypParser->yyidx++;
624 yymsp -= yysize-1;
625 yymsp->stateno = (YYACTIONTYPE)yyact;
626 yymsp->major = (YYCODETYPE)yygoto;
627 yymsp->minor = yygotominor;
628 }else
629 #endif
631 yy_shift(yypParser,yyact,yygoto,&yygotominor);
633 }else{
634 assert( yyact == YYNSTATE + YYNRULE + 1 );
635 yy_accept(yypParser);
640 ** The following code executes when the parse fails
642 #ifndef YYNOERRORRECOVERY
643 static void yy_parse_failed(
644 yyParser *yypParser /* The parser */
646 ParseARG_FETCH;
647 #ifndef NDEBUG
648 if( yyTraceFILE ){
649 fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
651 #endif
652 while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
653 /* Here code is inserted which will be executed whenever the
654 ** parser fails */
656 ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
658 #endif /* YYNOERRORRECOVERY */
661 ** The following code executes when a syntax error first occurs.
663 static void yy_syntax_error(
664 yyParser *yypParser, /* The parser */
665 int yymajor, /* The major type of the error token */
666 YYMINORTYPE yyminor /* The minor type of the error token */
668 ParseARG_FETCH;
669 #define TOKEN (yyminor.yy0)
671 ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
675 ** The following is executed when the parser accepts
677 static void yy_accept(
678 yyParser *yypParser /* The parser */
680 ParseARG_FETCH;
681 #ifndef NDEBUG
682 if( yyTraceFILE ){
683 fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
685 #endif
686 while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
687 /* Here code is inserted which will be executed whenever the
688 ** parser accepts */
690 ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
693 /* The main parser program.
694 ** The first argument is a pointer to a structure obtained from
695 ** "ParseAlloc" which describes the current state of the parser.
696 ** The second argument is the major token number. The third is
697 ** the minor token. The fourth optional argument is whatever the
698 ** user wants (and specified in the grammar) and is available for
699 ** use by the action routines.
701 ** Inputs:
702 ** <ul>
703 ** <li> A pointer to the parser (an opaque structure.)
704 ** <li> The major token number.
705 ** <li> The minor token number.
706 ** <li> An option argument of a grammar-specified type.
707 ** </ul>
709 ** Outputs:
710 ** None.
712 void Parse(
713 void *yyp, /* The parser */
714 int yymajor, /* The major token code number */
715 ParseTOKENTYPE yyminor /* The value for the token */
716 ParseARG_PDECL /* Optional %extra_argument parameter */
718 YYMINORTYPE yyminorunion;
719 int yyact; /* The parser action. */
720 #if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
721 int yyendofinput; /* True if we are at the end of input */
722 #endif
723 #ifdef YYERRORSYMBOL
724 int yyerrorhit = 0; /* True if yymajor has invoked an error */
725 #endif
726 yyParser *yypParser; /* The parser */
728 /* (re)initialize the parser, if necessary */
729 yypParser = (yyParser*)yyp;
730 if( yypParser->yyidx<0 ){
731 #if YYSTACKDEPTH<=0
732 if( yypParser->yystksz <=0 ){
733 /*memset(&yyminorunion, 0, sizeof(yyminorunion));*/
734 yyminorunion = yyzerominor;
735 yyStackOverflow(yypParser, &yyminorunion);
736 return;
738 #endif
739 yypParser->yyidx = 0;
740 yypParser->yyerrcnt = -1;
741 yypParser->yystack[0].stateno = 0;
742 yypParser->yystack[0].major = 0;
744 yyminorunion.yy0 = yyminor;
745 #if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
746 yyendofinput = (yymajor==0);
747 #endif
748 ParseARG_STORE;
750 #ifndef NDEBUG
751 if( yyTraceFILE ){
752 fprintf(yyTraceFILE,"%sInput %s\n",yyTracePrompt,yyTokenName[yymajor]);
754 #endif
757 yyact = yy_find_shift_action(yypParser,(YYCODETYPE)yymajor);
758 if( yyact<YYNSTATE ){
759 yy_shift(yypParser,yyact,yymajor,&yyminorunion);
760 yypParser->yyerrcnt--;
761 yymajor = YYNOCODE;
762 }else if( yyact < YYNSTATE + YYNRULE ){
763 yy_reduce(yypParser,yyact-YYNSTATE);
764 }else{
765 assert( yyact == YY_ERROR_ACTION );
766 #ifdef YYERRORSYMBOL
767 int yymx;
768 #endif
769 #ifndef NDEBUG
770 if( yyTraceFILE ){
771 fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt);
773 #endif
774 #ifdef YYERRORSYMBOL
775 /* A syntax error has occurred.
776 ** The response to an error depends upon whether or not the
777 ** grammar defines an error token "ERROR".
779 ** This is what we do if the grammar does define ERROR:
781 ** * Call the %syntax_error function.
783 ** * Begin popping the stack until we enter a state where
784 ** it is legal to shift the error symbol, then shift
785 ** the error symbol.
787 ** * Set the error count to three.
789 ** * Begin accepting and shifting new tokens. No new error
790 ** processing will occur until three tokens have been
791 ** shifted successfully.
794 if( yypParser->yyerrcnt<0 ){
795 yy_syntax_error(yypParser,yymajor,yyminorunion);
797 yymx = yypParser->yystack[yypParser->yyidx].major;
798 if( yymx==YYERRORSYMBOL || yyerrorhit ){
799 #ifndef NDEBUG
800 if( yyTraceFILE ){
801 fprintf(yyTraceFILE,"%sDiscard input token %s\n",
802 yyTracePrompt,yyTokenName[yymajor]);
804 #endif
805 yy_destructor(yypParser, (YYCODETYPE)yymajor,&yyminorunion);
806 yymajor = YYNOCODE;
807 }else{
808 while(
809 yypParser->yyidx >= 0 &&
810 yymx != YYERRORSYMBOL &&
811 (yyact = yy_find_reduce_action(
812 yypParser->yystack[yypParser->yyidx].stateno,
813 YYERRORSYMBOL)) >= YYNSTATE
815 yy_pop_parser_stack(yypParser);
817 if( yypParser->yyidx < 0 || yymajor==0 ){
818 yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
819 yy_parse_failed(yypParser);
820 yymajor = YYNOCODE;
821 }else if( yymx!=YYERRORSYMBOL ){
822 YYMINORTYPE u2;
823 u2.YYERRSYMDT = 0;
824 yy_shift(yypParser,yyact,YYERRORSYMBOL,&u2);
827 yypParser->yyerrcnt = 3;
828 yyerrorhit = 1;
829 #elif defined(YYNOERRORRECOVERY)
830 /* If the YYNOERRORRECOVERY macro is defined, then do not attempt to
831 ** do any kind of error recovery. Instead, simply invoke the syntax
832 ** error routine and continue going as if nothing had happened.
834 ** Applications can set this macro (for example inside %include) if
835 ** they intend to abandon the parse upon the first syntax error seen.
837 yy_syntax_error(yypParser,yymajor,yyminorunion);
838 yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
839 yymajor = YYNOCODE;
841 #else /* YYERRORSYMBOL is not defined */
842 /* This is what we do if the grammar does not define ERROR:
844 ** * Report an error message, and throw away the input token.
846 ** * If the input token is $, then fail the parse.
848 ** As before, subsequent error messages are suppressed until
849 ** three input tokens have been successfully shifted.
851 if( yypParser->yyerrcnt<=0 ){
852 yy_syntax_error(yypParser,yymajor,yyminorunion);
854 yypParser->yyerrcnt = 3;
855 yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
856 if( yyendofinput ){
857 yy_parse_failed(yypParser);
859 yymajor = YYNOCODE;
860 #endif
862 }while( yymajor!=YYNOCODE && yypParser->yyidx>=0 );
863 return;