source: trunk/src/3rdparty/sqlite/tokenize.c

Last change on this file was 205, checked in by rudi, 14 years ago

Added SQLite 2.8.17 sources. This allows to build at least one of the sql drivers / plugins.
File size: 20.7 KB
RevLine 
[205]1/*
2** 2001 September 15
3**
4** The author disclaims copyright to this source code. In place of
5** a legal notice, here is a blessing:
6**
7** May you do good and not evil.
8** May you find forgiveness for yourself and forgive others.
9** May you share freely, never taking more than you give.
10**
11*************************************************************************
12** An tokenizer for SQL
13**
14** This file contains C code that splits an SQL input string up into
15** individual tokens and sends those tokens one-by-one over to the
16** parser for analysis.
17**
18** $Id: tokenize.c,v 1.68 2004/02/14 23:59:58 drh Exp $
19*/
20#include "sqliteInt.h"
21#include "os.h"
22#include <ctype.h>
23#include <stdlib.h>
24
25/*
26** All the keywords of the SQL language are stored as in a hash
27** table composed of instances of the following structure.
28*/
29typedef struct Keyword Keyword;
30struct Keyword {
31 char *zName; /* The keyword name */
32 u8 tokenType; /* Token value for this keyword */
33 u8 len; /* Length of this keyword */
34 u8 iNext; /* Index in aKeywordTable[] of next with same hash */
35};
36
37/*
38** These are the keywords
39*/
40static Keyword aKeywordTable[] = {
41 { "ABORT", TK_ABORT, },
42 { "AFTER", TK_AFTER, },
43 { "ALL", TK_ALL, },
44 { "AND", TK_AND, },
45 { "AS", TK_AS, },
46 { "ASC", TK_ASC, },
47 { "ATTACH", TK_ATTACH, },
48 { "BEFORE", TK_BEFORE, },
49 { "BEGIN", TK_BEGIN, },
50 { "BETWEEN", TK_BETWEEN, },
51 { "BY", TK_BY, },
52 { "CASCADE", TK_CASCADE, },
53 { "CASE", TK_CASE, },
54 { "CHECK", TK_CHECK, },
55 { "CLUSTER", TK_CLUSTER, },
56 { "COLLATE", TK_COLLATE, },
57 { "COMMIT", TK_COMMIT, },
58 { "CONFLICT", TK_CONFLICT, },
59 { "CONSTRAINT", TK_CONSTRAINT, },
60 { "COPY", TK_COPY, },
61 { "CREATE", TK_CREATE, },
62 { "CROSS", TK_JOIN_KW, },
63 { "DATABASE", TK_DATABASE, },
64 { "DEFAULT", TK_DEFAULT, },
65 { "DEFERRED", TK_DEFERRED, },
66 { "DEFERRABLE", TK_DEFERRABLE, },
67 { "DELETE", TK_DELETE, },
68 { "DELIMITERS", TK_DELIMITERS, },
69 { "DESC", TK_DESC, },
70 { "DETACH", TK_DETACH, },
71 { "DISTINCT", TK_DISTINCT, },
72 { "DROP", TK_DROP, },
73 { "END", TK_END, },
74 { "EACH", TK_EACH, },
75 { "ELSE", TK_ELSE, },
76 { "EXCEPT", TK_EXCEPT, },
77 { "EXPLAIN", TK_EXPLAIN, },
78 { "FAIL", TK_FAIL, },
79 { "FOR", TK_FOR, },
80 { "FOREIGN", TK_FOREIGN, },
81 { "FROM", TK_FROM, },
82 { "FULL", TK_JOIN_KW, },
83 { "GLOB", TK_GLOB, },
84 { "GROUP", TK_GROUP, },
85 { "HAVING", TK_HAVING, },
86 { "IGNORE", TK_IGNORE, },
87 { "IMMEDIATE", TK_IMMEDIATE, },
88 { "IN", TK_IN, },
89 { "INDEX", TK_INDEX, },
90 { "INITIALLY", TK_INITIALLY, },
91 { "INNER", TK_JOIN_KW, },
92 { "INSERT", TK_INSERT, },
93 { "INSTEAD", TK_INSTEAD, },
94 { "INTERSECT", TK_INTERSECT, },
95 { "INTO", TK_INTO, },
96 { "IS", TK_IS, },
97 { "ISNULL", TK_ISNULL, },
98 { "JOIN", TK_JOIN, },
99 { "KEY", TK_KEY, },
100 { "LEFT", TK_JOIN_KW, },
101 { "LIKE", TK_LIKE, },
102 { "LIMIT", TK_LIMIT, },
103 { "MATCH", TK_MATCH, },
104 { "NATURAL", TK_JOIN_KW, },
105 { "NOT", TK_NOT, },
106 { "NOTNULL", TK_NOTNULL, },
107 { "NULL", TK_NULL, },
108 { "OF", TK_OF, },
109 { "OFFSET", TK_OFFSET, },
110 { "ON", TK_ON, },
111 { "OR", TK_OR, },
112 { "ORDER", TK_ORDER, },
113 { "OUTER", TK_JOIN_KW, },
114 { "PRAGMA", TK_PRAGMA, },
115 { "PRIMARY", TK_PRIMARY, },
116 { "RAISE", TK_RAISE, },
117 { "REFERENCES", TK_REFERENCES, },
118 { "REPLACE", TK_REPLACE, },
119 { "RESTRICT", TK_RESTRICT, },
120 { "RIGHT", TK_JOIN_KW, },
121 { "ROLLBACK", TK_ROLLBACK, },
122 { "ROW", TK_ROW, },
123 { "SELECT", TK_SELECT, },
124 { "SET", TK_SET, },
125 { "STATEMENT", TK_STATEMENT, },
126 { "TABLE", TK_TABLE, },
127 { "TEMP", TK_TEMP, },
128 { "TEMPORARY", TK_TEMP, },
129 { "THEN", TK_THEN, },
130 { "TRANSACTION", TK_TRANSACTION, },
131 { "TRIGGER", TK_TRIGGER, },
132 { "UNION", TK_UNION, },
133 { "UNIQUE", TK_UNIQUE, },
134 { "UPDATE", TK_UPDATE, },
135 { "USING", TK_USING, },
136 { "VACUUM", TK_VACUUM, },
137 { "VALUES", TK_VALUES, },
138 { "VIEW", TK_VIEW, },
139 { "WHEN", TK_WHEN, },
140 { "WHERE", TK_WHERE, },
141};
142
143/*
144** This is the hash table
145*/
146#define KEY_HASH_SIZE 101
147static u8 aiHashTable[KEY_HASH_SIZE];
148
149
150/*
151** This function looks up an identifier to determine if it is a
152** keyword. If it is a keyword, the token code of that keyword is
153** returned. If the input is not a keyword, TK_ID is returned.
154*/
155int sqliteKeywordCode(const char *z, int n){
156 int h, i;
157 Keyword *p;
158 static char needInit = 1;
159 if( needInit ){
160 /* Initialize the keyword hash table */
161 sqliteOsEnterMutex();
162 if( needInit ){
163 int nk;
164 nk = sizeof(aKeywordTable)/sizeof(aKeywordTable[0]);
165 for(i=0; i<nk; i++){
166 aKeywordTable[i].len = strlen(aKeywordTable[i].zName);
167 h = sqliteHashNoCase(aKeywordTable[i].zName, aKeywordTable[i].len);
168 h %= KEY_HASH_SIZE;
169 aKeywordTable[i].iNext = aiHashTable[h];
170 aiHashTable[h] = i+1;
171 }
172 needInit = 0;
173 }
174 sqliteOsLeaveMutex();
175 }
176 h = sqliteHashNoCase(z, n) % KEY_HASH_SIZE;
177 for(i=aiHashTable[h]; i; i=p->iNext){
178 p = &aKeywordTable[i-1];
179 if( p->len==n && sqliteStrNICmp(p->zName, z, n)==0 ){
180 return p->tokenType;
181 }
182 }
183 return TK_ID;
184}
185
186
187/*
188** If X is a character that can be used in an identifier and
189** X&0x80==0 then isIdChar[X] will be 1. If X&0x80==0x80 then
190** X is always an identifier character. (Hence all UTF-8
191** characters can be part of an identifier). isIdChar[X] will
192** be 0 for every character in the lower 128 ASCII characters
193** that cannot be used as part of an identifier.
194**
195** In this implementation, an identifier can be a string of
196** alphabetic characters, digits, and "_" plus any character
197** with the high-order bit set. The latter rule means that
198** any sequence of UTF-8 characters or characters taken from
199** an extended ISO8859 character set can form an identifier.
200*/
201static const char isIdChar[] = {
202/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
203 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
204 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
205 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */
206 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 3x */
207 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 4x */
208 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, /* 5x */
209 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6x */
210 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, /* 7x */
211};
212
213
214/*
215** Return the length of the token that begins at z[0].
216** Store the token type in *tokenType before returning.
217*/
218static int sqliteGetToken(const unsigned char *z, int *tokenType){
219 int i;
220 switch( *z ){
221 case ' ': case '\t': case '\n': case '\f': case '\r': {
222 for(i=1; isspace(z[i]); i++){}
223 *tokenType = TK_SPACE;
224 return i;
225 }
226 case '-': {
227 if( z[1]=='-' ){
228 for(i=2; z[i] && z[i]!='\n'; i++){}
229 *tokenType = TK_COMMENT;
230 return i;
231 }
232 *tokenType = TK_MINUS;
233 return 1;
234 }
235 case '(': {
236 *tokenType = TK_LP;
237 return 1;
238 }
239 case ')': {
240 *tokenType = TK_RP;
241 return 1;
242 }
243 case ';': {
244 *tokenType = TK_SEMI;
245 return 1;
246 }
247 case '+': {
248 *tokenType = TK_PLUS;
249 return 1;
250 }
251 case '*': {
252 *tokenType = TK_STAR;
253 return 1;
254 }
255 case '/': {
256 if( z[1]!='*' || z[2]==0 ){
257 *tokenType = TK_SLASH;
258 return 1;
259 }
260 for(i=3; z[i] && (z[i]!='/' || z[i-1]!='*'); i++){}
261 if( z[i] ) i++;
262 *tokenType = TK_COMMENT;
263 return i;
264 }
265 case '%': {
266 *tokenType = TK_REM;
267 return 1;
268 }
269 case '=': {
270 *tokenType = TK_EQ;
271 return 1 + (z[1]=='=');
272 }
273 case '<': {
274 if( z[1]=='=' ){
275 *tokenType = TK_LE;
276 return 2;
277 }else if( z[1]=='>' ){
278 *tokenType = TK_NE;
279 return 2;
280 }else if( z[1]=='<' ){
281 *tokenType = TK_LSHIFT;
282 return 2;
283 }else{
284 *tokenType = TK_LT;
285 return 1;
286 }
287 }
288 case '>': {
289 if( z[1]=='=' ){
290 *tokenType = TK_GE;
291 return 2;
292 }else if( z[1]=='>' ){
293 *tokenType = TK_RSHIFT;
294 return 2;
295 }else{
296 *tokenType = TK_GT;
297 return 1;
298 }
299 }
300 case '!': {
301 if( z[1]!='=' ){
302 *tokenType = TK_ILLEGAL;
303 return 2;
304 }else{
305 *tokenType = TK_NE;
306 return 2;
307 }
308 }
309 case '|': {
310 if( z[1]!='|' ){
311 *tokenType = TK_BITOR;
312 return 1;
313 }else{
314 *tokenType = TK_CONCAT;
315 return 2;
316 }
317 }
318 case ',': {
319 *tokenType = TK_COMMA;
320 return 1;
321 }
322 case '&': {
323 *tokenType = TK_BITAND;
324 return 1;
325 }
326 case '~': {
327 *tokenType = TK_BITNOT;
328 return 1;
329 }
330 case '\'': case '"': {
331 int delim = z[0];
332 for(i=1; z[i]; i++){
333 if( z[i]==delim ){
334 if( z[i+1]==delim ){
335 i++;
336 }else{
337 break;
338 }
339 }
340 }
341 if( z[i] ) i++;
342 *tokenType = TK_STRING;
343 return i;
344 }
345 case '.': {
346 *tokenType = TK_DOT;
347 return 1;
348 }
349 case '0': case '1': case '2': case '3': case '4':
350 case '5': case '6': case '7': case '8': case '9': {
351 *tokenType = TK_INTEGER;
352 for(i=1; isdigit(z[i]); i++){}
353 if( z[i]=='.' && isdigit(z[i+1]) ){
354 i += 2;
355 while( isdigit(z[i]) ){ i++; }
356 *tokenType = TK_FLOAT;
357 }
358 if( (z[i]=='e' || z[i]=='E') &&
359 ( isdigit(z[i+1])
360 || ((z[i+1]=='+' || z[i+1]=='-') && isdigit(z[i+2]))
361 )
362 ){
363 i += 2;
364 while( isdigit(z[i]) ){ i++; }
365 *tokenType = TK_FLOAT;
366 }
367 return i;
368 }
369 case '[': {
370 for(i=1; z[i] && z[i-1]!=']'; i++){}
371 *tokenType = TK_ID;
372 return i;
373 }
374 case '?': {
375 *tokenType = TK_VARIABLE;
376 return 1;
377 }
378 default: {
379 if( (*z&0x80)==0 && !isIdChar[*z] ){
380 break;
381 }
382 for(i=1; (z[i]&0x80)!=0 || isIdChar[z[i]]; i++){}
383 *tokenType = sqliteKeywordCode((char*)z, i);
384 return i;
385 }
386 }
387 *tokenType = TK_ILLEGAL;
388 return 1;
389}
390
391/*
392** Run the parser on the given SQL string. The parser structure is
393** passed in. An SQLITE_ status code is returned. If an error occurs
394** and pzErrMsg!=NULL then an error message might be written into
395** memory obtained from malloc() and *pzErrMsg made to point to that
396** error message. Or maybe not.
397*/
398int sqliteRunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
399 int nErr = 0;
400 int i;
401 void *pEngine;
402 int tokenType;
403 int lastTokenParsed = -1;
404 sqlite *db = pParse->db;
405 extern void *sqliteParserAlloc(void*(*)(int));
406 extern void sqliteParserFree(void*, void(*)(void*));
407 extern int sqliteParser(void*, int, Token, Parse*);
408
409 db->flags &= ~SQLITE_Interrupt;
410 pParse->rc = SQLITE_OK;
411 i = 0;
412 pEngine = sqliteParserAlloc((void*(*)(int))malloc);
413 if( pEngine==0 ){
414 sqliteSetString(pzErrMsg, "out of memory", (char*)0);
415 return 1;
416 }
417 pParse->sLastToken.dyn = 0;
418 pParse->zTail = zSql;
419 while( sqlite_malloc_failed==0 && zSql[i]!=0 ){
420 assert( i>=0 );
421 pParse->sLastToken.z = &zSql[i];
422 assert( pParse->sLastToken.dyn==0 );
423 pParse->sLastToken.n = sqliteGetToken((unsigned char*)&zSql[i], &tokenType);
424 i += pParse->sLastToken.n;
425 switch( tokenType ){
426 case TK_SPACE:
427 case TK_COMMENT: {
428 if( (db->flags & SQLITE_Interrupt)!=0 ){
429 pParse->rc = SQLITE_INTERRUPT;
430 sqliteSetString(pzErrMsg, "interrupt", (char*)0);
431 goto abort_parse;
432 }
433 break;
434 }
435 case TK_ILLEGAL: {
436 sqliteSetNString(pzErrMsg, "unrecognized token: \"", -1,
437 pParse->sLastToken.z, pParse->sLastToken.n, "\"", 1, 0);
438 nErr++;
439 goto abort_parse;
440 }
441 case TK_SEMI: {
442 pParse->zTail = &zSql[i];
443 /* Fall thru into the default case */
444 }
445 default: {
446 sqliteParser(pEngine, tokenType, pParse->sLastToken, pParse);
447 lastTokenParsed = tokenType;
448 if( pParse->rc!=SQLITE_OK ){
449 goto abort_parse;
450 }
451 break;
452 }
453 }
454 }
455abort_parse:
456 if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
457 if( lastTokenParsed!=TK_SEMI ){
458 sqliteParser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
459 pParse->zTail = &zSql[i];
460 }
461 sqliteParser(pEngine, 0, pParse->sLastToken, pParse);
462 }
463 sqliteParserFree(pEngine, free);
464 if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
465 sqliteSetString(&pParse->zErrMsg, sqlite_error_string(pParse->rc),
466 (char*)0);
467 }
468 if( pParse->zErrMsg ){
469 if( pzErrMsg && *pzErrMsg==0 ){
470 *pzErrMsg = pParse->zErrMsg;
471 }else{
472 sqliteFree(pParse->zErrMsg);
473 }
474 pParse->zErrMsg = 0;
475 if( !nErr ) nErr++;
476 }
477 if( pParse->pVdbe && pParse->nErr>0 ){
478 sqliteVdbeDelete(pParse->pVdbe);
479 pParse->pVdbe = 0;
480 }
481 if( pParse->pNewTable ){
482 sqliteDeleteTable(pParse->db, pParse->pNewTable);
483 pParse->pNewTable = 0;
484 }
485 if( pParse->pNewTrigger ){
486 sqliteDeleteTrigger(pParse->pNewTrigger);
487 pParse->pNewTrigger = 0;
488 }
489 if( nErr>0 && (pParse->rc==SQLITE_OK || pParse->rc==SQLITE_DONE) ){
490 pParse->rc = SQLITE_ERROR;
491 }
492 return nErr;
493}
494
495/*
496** Token types used by the sqlite_complete() routine. See the header
497** comments on that procedure for additional information.
498*/
499#define tkEXPLAIN 0
500#define tkCREATE 1
501#define tkTEMP 2
502#define tkTRIGGER 3
503#define tkEND 4
504#define tkSEMI 5
505#define tkWS 6
506#define tkOTHER 7
507
508/*
509** Return TRUE if the given SQL string ends in a semicolon.
510**
511** Special handling is require for CREATE TRIGGER statements.
512** Whenever the CREATE TRIGGER keywords are seen, the statement
513** must end with ";END;".
514**
515** This implementation uses a state machine with 7 states:
516**
517** (0) START At the beginning or end of an SQL statement. This routine
518** returns 1 if it ends in the START state and 0 if it ends
519** in any other state.
520**
521** (1) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
522** a statement.
523**
524** (2) CREATE The keyword CREATE has been seen at the beginning of a
525** statement, possibly preceeded by EXPLAIN and/or followed by
526** TEMP or TEMPORARY
527**
528** (3) NORMAL We are in the middle of statement which ends with a single
529** semicolon.
530**
531** (4) TRIGGER We are in the middle of a trigger definition that must be
532** ended by a semicolon, the keyword END, and another semicolon.
533**
534** (5) SEMI We've seen the first semicolon in the ";END;" that occurs at
535** the end of a trigger definition.
536**
537** (6) END We've seen the ";END" of the ";END;" that occurs at the end
538** of a trigger difinition.
539**
540** Transitions between states above are determined by tokens extracted
541** from the input. The following tokens are significant:
542**
543** (0) tkEXPLAIN The "explain" keyword.
544** (1) tkCREATE The "create" keyword.
545** (2) tkTEMP The "temp" or "temporary" keyword.
546** (3) tkTRIGGER The "trigger" keyword.
547** (4) tkEND The "end" keyword.
548** (5) tkSEMI A semicolon.
549** (6) tkWS Whitespace
550** (7) tkOTHER Any other SQL token.
551**
552** Whitespace never causes a state transition and is always ignored.
553*/
554int sqlite_complete(const char *zSql){
555 u8 state = 0; /* Current state, using numbers defined in header comment */
556 u8 token; /* Value of the next token */
557
558 /* The following matrix defines the transition from one state to another
559 ** according to what token is seen. trans[state][token] returns the
560 ** next state.
561 */
562 static const u8 trans[7][8] = {
563 /* Token: */
564 /* State: ** EXPLAIN CREATE TEMP TRIGGER END SEMI WS OTHER */
565 /* 0 START: */ { 1, 2, 3, 3, 3, 0, 0, 3, },
566 /* 1 EXPLAIN: */ { 3, 2, 3, 3, 3, 0, 1, 3, },
567 /* 2 CREATE: */ { 3, 3, 2, 4, 3, 0, 2, 3, },
568 /* 3 NORMAL: */ { 3, 3, 3, 3, 3, 0, 3, 3, },
569 /* 4 TRIGGER: */ { 4, 4, 4, 4, 4, 5, 4, 4, },
570 /* 5 SEMI: */ { 4, 4, 4, 4, 6, 5, 5, 4, },
571 /* 6 END: */ { 4, 4, 4, 4, 4, 0, 6, 4, },
572 };
573
574 while( *zSql ){
575 switch( *zSql ){
576 case ';': { /* A semicolon */
577 token = tkSEMI;
578 break;
579 }
580 case ' ':
581 case '\r':
582 case '\t':
583 case '\n':
584 case '\f': { /* White space is ignored */
585 token = tkWS;
586 break;
587 }
588 case '/': { /* C-style comments */
589 if( zSql[1]!='*' ){
590 token = tkOTHER;
591 break;
592 }
593 zSql += 2;
594 while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; }
595 if( zSql[0]==0 ) return 0;
596 zSql++;
597 token = tkWS;
598 break;
599 }
600 case '-': { /* SQL-style comments from "--" to end of line */
601 if( zSql[1]!='-' ){
602 token = tkOTHER;
603 break;
604 }
605 while( *zSql && *zSql!='\n' ){ zSql++; }
606 if( *zSql==0 ) return state==0;
607 token = tkWS;
608 break;
609 }
610 case '[': { /* Microsoft-style identifiers in [...] */
611 zSql++;
612 while( *zSql && *zSql!=']' ){ zSql++; }
613 if( *zSql==0 ) return 0;
614 token = tkOTHER;
615 break;
616 }
617 case '"': /* single- and double-quoted strings */
618 case '\'': {
619 int c = *zSql;
620 zSql++;
621 while( *zSql && *zSql!=c ){ zSql++; }
622 if( *zSql==0 ) return 0;
623 token = tkOTHER;
624 break;
625 }
626 default: {
627 if( isIdChar[(u8)*zSql] ){
628 /* Keywords and unquoted identifiers */
629 int nId;
630 for(nId=1; isIdChar[(u8)zSql[nId]]; nId++){}
631 switch( *zSql ){
632 case 'c': case 'C': {
633 if( nId==6 && sqliteStrNICmp(zSql, "create", 6)==0 ){
634 token = tkCREATE;
635 }else{
636 token = tkOTHER;
637 }
638 break;
639 }
640 case 't': case 'T': {
641 if( nId==7 && sqliteStrNICmp(zSql, "trigger", 7)==0 ){
642 token = tkTRIGGER;
643 }else if( nId==4 && sqliteStrNICmp(zSql, "temp", 4)==0 ){
644 token = tkTEMP;
645 }else if( nId==9 && sqliteStrNICmp(zSql, "temporary", 9)==0 ){
646 token = tkTEMP;
647 }else{
648 token = tkOTHER;
649 }
650 break;
651 }
652 case 'e': case 'E': {
653 if( nId==3 && sqliteStrNICmp(zSql, "end", 3)==0 ){
654 token = tkEND;
655 }else if( nId==7 && sqliteStrNICmp(zSql, "explain", 7)==0 ){
656 token = tkEXPLAIN;
657 }else{
658 token = tkOTHER;
659 }
660 break;
661 }
662 default: {
663 token = tkOTHER;
664 break;
665 }
666 }
667 zSql += nId-1;
668 }else{
669 /* Operators and special symbols */
670 token = tkOTHER;
671 }
672 break;
673 }
674 }
675 state = trans[state][token];
676 zSql++;
677 }
678 return state==0;
679}
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