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[chromium-blink-merge.git] / third_party / sqlite / sqlite-src-3080704 / src / tokenize.c
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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.
11 *************************************************************************
12 ** An tokenizer for SQL
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.
18 #include "sqliteInt.h"
19 #include <stdlib.h>
22 ** The charMap() macro maps alphabetic characters into their
23 ** lower-case ASCII equivalent. On ASCII machines, this is just
24 ** an upper-to-lower case map. On EBCDIC machines we also need
25 ** to adjust the encoding. Only alphabetic characters and underscores
26 ** need to be translated.
28 #ifdef SQLITE_ASCII
29 # define charMap(X) sqlite3UpperToLower[(unsigned char)X]
30 #endif
31 #ifdef SQLITE_EBCDIC
32 # define charMap(X) ebcdicToAscii[(unsigned char)X]
33 const unsigned char ebcdicToAscii[] = {
34 /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
35 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
37 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */
38 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3x */
39 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4x */
40 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5x */
41 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 0, 0, /* 6x */
42 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7x */
43 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* 8x */
44 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* 9x */
45 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ax */
46 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
47 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* Cx */
48 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* Dx */
49 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ex */
50 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Fx */
52 #endif
55 ** The sqlite3KeywordCode function looks up an identifier to determine if
56 ** it is a keyword. If it is a keyword, the token code of that keyword is
57 ** returned. If the input is not a keyword, TK_ID is returned.
59 ** The implementation of this routine was generated by a program,
60 ** mkkeywordhash.h, located in the tool subdirectory of the distribution.
61 ** The output of the mkkeywordhash.c program is written into a file
62 ** named keywordhash.h and then included into this source file by
63 ** the #include below.
65 #include "keywordhash.h"
69 ** If X is a character that can be used in an identifier then
70 ** IdChar(X) will be true. Otherwise it is false.
72 ** For ASCII, any character with the high-order bit set is
73 ** allowed in an identifier. For 7-bit characters,
74 ** sqlite3IsIdChar[X] must be 1.
76 ** For EBCDIC, the rules are more complex but have the same
77 ** end result.
79 ** Ticket #1066. the SQL standard does not allow '$' in the
80 ** middle of identifiers. But many SQL implementations do.
81 ** SQLite will allow '$' in identifiers for compatibility.
82 ** But the feature is undocumented.
84 #ifdef SQLITE_ASCII
85 #define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
86 #endif
87 #ifdef SQLITE_EBCDIC
88 const char sqlite3IsEbcdicIdChar[] = {
89 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
90 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 4x */
91 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, /* 5x */
92 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, /* 6x */
93 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, /* 7x */
94 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, /* 8x */
95 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, /* 9x */
96 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, /* Ax */
97 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
98 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Cx */
99 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Dx */
100 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Ex */
101 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, /* Fx */
103 #define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
104 #endif
105 int sqlite3IsIdChar(u8 c){ return IdChar(c); }
109 ** Return the length of the token that begins at z[0].
110 ** Store the token type in *tokenType before returning.
112 int sqlite3GetToken(const unsigned char *z, int *tokenType){
113 int i, c;
114 switch( *z ){
115 case ' ': case '\t': case '\n': case '\f': case '\r': {
116 testcase( z[0]==' ' );
117 testcase( z[0]=='\t' );
118 testcase( z[0]=='\n' );
119 testcase( z[0]=='\f' );
120 testcase( z[0]=='\r' );
121 for(i=1; sqlite3Isspace(z[i]); i++){}
122 *tokenType = TK_SPACE;
123 return i;
125 case '-': {
126 if( z[1]=='-' ){
127 for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
128 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */
129 return i;
131 *tokenType = TK_MINUS;
132 return 1;
134 case '(': {
135 *tokenType = TK_LP;
136 return 1;
138 case ')': {
139 *tokenType = TK_RP;
140 return 1;
142 case ';': {
143 *tokenType = TK_SEMI;
144 return 1;
146 case '+': {
147 *tokenType = TK_PLUS;
148 return 1;
150 case '*': {
151 *tokenType = TK_STAR;
152 return 1;
154 case '/': {
155 if( z[1]!='*' || z[2]==0 ){
156 *tokenType = TK_SLASH;
157 return 1;
159 for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
160 if( c ) i++;
161 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */
162 return i;
164 case '%': {
165 *tokenType = TK_REM;
166 return 1;
168 case '=': {
169 *tokenType = TK_EQ;
170 return 1 + (z[1]=='=');
172 case '<': {
173 if( (c=z[1])=='=' ){
174 *tokenType = TK_LE;
175 return 2;
176 }else if( c=='>' ){
177 *tokenType = TK_NE;
178 return 2;
179 }else if( c=='<' ){
180 *tokenType = TK_LSHIFT;
181 return 2;
182 }else{
183 *tokenType = TK_LT;
184 return 1;
187 case '>': {
188 if( (c=z[1])=='=' ){
189 *tokenType = TK_GE;
190 return 2;
191 }else if( c=='>' ){
192 *tokenType = TK_RSHIFT;
193 return 2;
194 }else{
195 *tokenType = TK_GT;
196 return 1;
199 case '!': {
200 if( z[1]!='=' ){
201 *tokenType = TK_ILLEGAL;
202 return 2;
203 }else{
204 *tokenType = TK_NE;
205 return 2;
208 case '|': {
209 if( z[1]!='|' ){
210 *tokenType = TK_BITOR;
211 return 1;
212 }else{
213 *tokenType = TK_CONCAT;
214 return 2;
217 case ',': {
218 *tokenType = TK_COMMA;
219 return 1;
221 case '&': {
222 *tokenType = TK_BITAND;
223 return 1;
225 case '~': {
226 *tokenType = TK_BITNOT;
227 return 1;
229 case '`':
230 case '\'':
231 case '"': {
232 int delim = z[0];
233 testcase( delim=='`' );
234 testcase( delim=='\'' );
235 testcase( delim=='"' );
236 for(i=1; (c=z[i])!=0; i++){
237 if( c==delim ){
238 if( z[i+1]==delim ){
239 i++;
240 }else{
241 break;
245 if( c=='\'' ){
246 *tokenType = TK_STRING;
247 return i+1;
248 }else if( c!=0 ){
249 *tokenType = TK_ID;
250 return i+1;
251 }else{
252 *tokenType = TK_ILLEGAL;
253 return i;
256 case '.': {
257 #ifndef SQLITE_OMIT_FLOATING_POINT
258 if( !sqlite3Isdigit(z[1]) )
259 #endif
261 *tokenType = TK_DOT;
262 return 1;
264 /* If the next character is a digit, this is a floating point
265 ** number that begins with ".". Fall thru into the next case */
267 case '0': case '1': case '2': case '3': case '4':
268 case '5': case '6': case '7': case '8': case '9': {
269 testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' );
270 testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' );
271 testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' );
272 testcase( z[0]=='9' );
273 *tokenType = TK_INTEGER;
274 #ifndef SQLITE_OMIT_HEX_INTEGER
275 if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){
276 for(i=3; sqlite3Isxdigit(z[i]); i++){}
277 return i;
279 #endif
280 for(i=0; sqlite3Isdigit(z[i]); i++){}
281 #ifndef SQLITE_OMIT_FLOATING_POINT
282 if( z[i]=='.' ){
283 i++;
284 while( sqlite3Isdigit(z[i]) ){ i++; }
285 *tokenType = TK_FLOAT;
287 if( (z[i]=='e' || z[i]=='E') &&
288 ( sqlite3Isdigit(z[i+1])
289 || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2]))
292 i += 2;
293 while( sqlite3Isdigit(z[i]) ){ i++; }
294 *tokenType = TK_FLOAT;
296 #endif
297 while( IdChar(z[i]) ){
298 *tokenType = TK_ILLEGAL;
299 i++;
301 return i;
303 case '[': {
304 for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
305 *tokenType = c==']' ? TK_ID : TK_ILLEGAL;
306 return i;
308 case '?': {
309 *tokenType = TK_VARIABLE;
310 for(i=1; sqlite3Isdigit(z[i]); i++){}
311 return i;
313 #ifndef SQLITE_OMIT_TCL_VARIABLE
314 case '$':
315 #endif
316 case '@': /* For compatibility with MS SQL Server */
317 case '#':
318 case ':': {
319 int n = 0;
320 testcase( z[0]=='$' ); testcase( z[0]=='@' );
321 testcase( z[0]==':' ); testcase( z[0]=='#' );
322 *tokenType = TK_VARIABLE;
323 for(i=1; (c=z[i])!=0; i++){
324 if( IdChar(c) ){
325 n++;
326 #ifndef SQLITE_OMIT_TCL_VARIABLE
327 }else if( c=='(' && n>0 ){
329 i++;
330 }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' );
331 if( c==')' ){
332 i++;
333 }else{
334 *tokenType = TK_ILLEGAL;
336 break;
337 }else if( c==':' && z[i+1]==':' ){
338 i++;
339 #endif
340 }else{
341 break;
344 if( n==0 ) *tokenType = TK_ILLEGAL;
345 return i;
347 #ifndef SQLITE_OMIT_BLOB_LITERAL
348 case 'x': case 'X': {
349 testcase( z[0]=='x' ); testcase( z[0]=='X' );
350 if( z[1]=='\'' ){
351 *tokenType = TK_BLOB;
352 for(i=2; sqlite3Isxdigit(z[i]); i++){}
353 if( z[i]!='\'' || i%2 ){
354 *tokenType = TK_ILLEGAL;
355 while( z[i] && z[i]!='\'' ){ i++; }
357 if( z[i] ) i++;
358 return i;
360 /* Otherwise fall through to the next case */
362 #endif
363 default: {
364 if( !IdChar(*z) ){
365 break;
367 for(i=1; IdChar(z[i]); i++){}
368 *tokenType = keywordCode((char*)z, i);
369 return i;
372 *tokenType = TK_ILLEGAL;
373 return 1;
377 ** Run the parser on the given SQL string. The parser structure is
378 ** passed in. An SQLITE_ status code is returned. If an error occurs
379 ** then an and attempt is made to write an error message into
380 ** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that
381 ** error message.
383 int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
384 int nErr = 0; /* Number of errors encountered */
385 int i; /* Loop counter */
386 void *pEngine; /* The LEMON-generated LALR(1) parser */
387 int tokenType; /* type of the next token */
388 int lastTokenParsed = -1; /* type of the previous token */
389 u8 enableLookaside; /* Saved value of db->lookaside.bEnabled */
390 sqlite3 *db = pParse->db; /* The database connection */
391 int mxSqlLen; /* Max length of an SQL string */
394 mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
395 if( db->nVdbeActive==0 ){
396 db->u1.isInterrupted = 0;
398 pParse->rc = SQLITE_OK;
399 pParse->zTail = zSql;
400 i = 0;
401 assert( pzErrMsg!=0 );
402 pEngine = sqlite3ParserAlloc(sqlite3Malloc);
403 if( pEngine==0 ){
404 db->mallocFailed = 1;
405 return SQLITE_NOMEM;
407 assert( pParse->pNewTable==0 );
408 assert( pParse->pNewTrigger==0 );
409 assert( pParse->nVar==0 );
410 assert( pParse->nzVar==0 );
411 assert( pParse->azVar==0 );
412 enableLookaside = db->lookaside.bEnabled;
413 if( db->lookaside.pStart ) db->lookaside.bEnabled = 1;
414 while( !db->mallocFailed && zSql[i]!=0 ){
415 assert( i>=0 );
416 pParse->sLastToken.z = &zSql[i];
417 pParse->sLastToken.n = sqlite3GetToken((unsigned char*)&zSql[i],&tokenType);
418 i += pParse->sLastToken.n;
419 if( i>mxSqlLen ){
420 pParse->rc = SQLITE_TOOBIG;
421 break;
423 switch( tokenType ){
424 case TK_SPACE: {
425 if( db->u1.isInterrupted ){
426 sqlite3ErrorMsg(pParse, "interrupt");
427 pParse->rc = SQLITE_INTERRUPT;
428 goto abort_parse;
430 break;
432 case TK_ILLEGAL: {
433 sqlite3DbFree(db, *pzErrMsg);
434 *pzErrMsg = sqlite3MPrintf(db, "unrecognized token: \"%T\"",
435 &pParse->sLastToken);
436 nErr++;
437 goto abort_parse;
439 case TK_SEMI: {
440 pParse->zTail = &zSql[i];
441 /* Fall thru into the default case */
443 default: {
444 sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
445 lastTokenParsed = tokenType;
446 if( pParse->rc!=SQLITE_OK ){
447 goto abort_parse;
449 break;
453 abort_parse:
454 if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
455 if( lastTokenParsed!=TK_SEMI ){
456 sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
457 pParse->zTail = &zSql[i];
459 sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
461 #ifdef YYTRACKMAXSTACKDEPTH
462 sqlite3StatusSet(SQLITE_STATUS_PARSER_STACK,
463 sqlite3ParserStackPeak(pEngine)
465 #endif /* YYDEBUG */
466 sqlite3ParserFree(pEngine, sqlite3_free);
467 db->lookaside.bEnabled = enableLookaside;
468 if( db->mallocFailed ){
469 pParse->rc = SQLITE_NOMEM;
471 if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
472 sqlite3SetString(&pParse->zErrMsg, db, "%s", sqlite3ErrStr(pParse->rc));
474 assert( pzErrMsg!=0 );
475 if( pParse->zErrMsg ){
476 *pzErrMsg = pParse->zErrMsg;
477 sqlite3_log(pParse->rc, "%s", *pzErrMsg);
478 pParse->zErrMsg = 0;
479 nErr++;
481 if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){
482 sqlite3VdbeDelete(pParse->pVdbe);
483 pParse->pVdbe = 0;
485 #ifndef SQLITE_OMIT_SHARED_CACHE
486 if( pParse->nested==0 ){
487 sqlite3DbFree(db, pParse->aTableLock);
488 pParse->aTableLock = 0;
489 pParse->nTableLock = 0;
491 #endif
492 #ifndef SQLITE_OMIT_VIRTUALTABLE
493 sqlite3_free(pParse->apVtabLock);
494 #endif
496 if( !IN_DECLARE_VTAB ){
497 /* If the pParse->declareVtab flag is set, do not delete any table
498 ** structure built up in pParse->pNewTable. The calling code (see vtab.c)
499 ** will take responsibility for freeing the Table structure.
501 sqlite3DeleteTable(db, pParse->pNewTable);
504 if( pParse->bFreeWith ) sqlite3WithDelete(db, pParse->pWith);
505 sqlite3DeleteTrigger(db, pParse->pNewTrigger);
506 for(i=pParse->nzVar-1; i>=0; i--) sqlite3DbFree(db, pParse->azVar[i]);
507 sqlite3DbFree(db, pParse->azVar);
508 while( pParse->pAinc ){
509 AutoincInfo *p = pParse->pAinc;
510 pParse->pAinc = p->pNext;
511 sqlite3DbFree(db, p);
513 while( pParse->pZombieTab ){
514 Table *p = pParse->pZombieTab;
515 pParse->pZombieTab = p->pNextZombie;
516 sqlite3DeleteTable(db, p);
518 if( nErr>0 && pParse->rc==SQLITE_OK ){
519 pParse->rc = SQLITE_ERROR;
521 return nErr;