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 #include "sqliteInt.h" 19 #include <stdlib.h> 20 21 /* 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. 27 */ 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 */ 51 }; 52 #endif 53 54 /* 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. 58 ** 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. 64 */ 65 #include "keywordhash.h" 66 67 68 /* 69 ** If X is a character that can be used in an identifier then 70 ** IdChar(X) will be true. Otherwise it is false. 71 ** 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. 75 ** 76 ** For EBCDIC, the rules are more complex but have the same 77 ** end result. 78 ** 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. 83 */ 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 */ 102 }; 103 #define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40])) 104 #endif 105 int sqlite3IsIdChar(u8 c){ return IdChar(c); } 106 107 108 /* 109 ** Return the length of the token that begins at z[0]. 110 ** Store the token type in *tokenType before returning. 111 */ 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; 124 } 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; 130 } 131 *tokenType = TK_MINUS; 132 return 1; 133 } 134 case '(': { 135 *tokenType = TK_LP; 136 return 1; 137 } 138 case ')': { 139 *tokenType = TK_RP; 140 return 1; 141 } 142 case ';': { 143 *tokenType = TK_SEMI; 144 return 1; 145 } 146 case '+': { 147 *tokenType = TK_PLUS; 148 return 1; 149 } 150 case '*': { 151 *tokenType = TK_STAR; 152 return 1; 153 } 154 case '/': { 155 if( z[1]!='*' || z[2]==0 ){ 156 *tokenType = TK_SLASH; 157 return 1; 158 } 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; 163 } 164 case '%': { 165 *tokenType = TK_REM; 166 return 1; 167 } 168 case '=': { 169 *tokenType = TK_EQ; 170 return 1 + (z[1]=='='); 171 } 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; 185 } 186 } 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; 197 } 198 } 199 case '!': { 200 if( z[1]!='=' ){ 201 *tokenType = TK_ILLEGAL; 202 return 2; 203 }else{ 204 *tokenType = TK_NE; 205 return 2; 206 } 207 } 208 case '|': { 209 if( z[1]!='|' ){ 210 *tokenType = TK_BITOR; 211 return 1; 212 }else{ 213 *tokenType = TK_CONCAT; 214 return 2; 215 } 216 } 217 case ',': { 218 *tokenType = TK_COMMA; 219 return 1; 220 } 221 case '&': { 222 *tokenType = TK_BITAND; 223 return 1; 224 } 225 case '~': { 226 *tokenType = TK_BITNOT; 227 return 1; 228 } 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; 242 } 243 } 244 } 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; 254 } 255 } 256 case '.': { 257 #ifndef SQLITE_OMIT_FLOATING_POINT 258 if( !sqlite3Isdigit(z[1]) ) 259 #endif 260 { 261 *tokenType = TK_DOT; 262 return 1; 263 } 264 /* If the next character is a digit, this is a floating point 265 ** number that begins with ".". Fall thru into the next case */ 266 } 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; 278 } 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; 286 } 287 if( (z[i]=='e' || z[i]=='E') && 288 ( sqlite3Isdigit(z[i+1]) 289 || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2])) 290 ) 291 ){ 292 i += 2; 293 while( sqlite3Isdigit(z[i]) ){ i++; } 294 *tokenType = TK_FLOAT; 295 } 296 #endif 297 while( IdChar(z[i]) ){ 298 *tokenType = TK_ILLEGAL; 299 i++; 300 } 301 return i; 302 } 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; 307 } 308 case '?': { 309 *tokenType = TK_VARIABLE; 310 for(i=1; sqlite3Isdigit(z[i]); i++){} 311 return i; 312 } 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 ){ 328 do{ 329 i++; 330 }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' ); 331 if( c==')' ){ 332 i++; 333 }else{ 334 *tokenType = TK_ILLEGAL; 335 } 336 break; 337 }else if( c==':' && z[i+1]==':' ){ 338 i++; 339 #endif 340 }else{ 341 break; 342 } 343 } 344 if( n==0 ) *tokenType = TK_ILLEGAL; 345 return i; 346 } 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++; } 356 } 357 if( z[i] ) i++; 358 return i; 359 } 360 /* Otherwise fall through to the next case */ 361 } 362 #endif 363 default: { 364 if( !IdChar(*z) ){ 365 break; 366 } 367 for(i=1; IdChar(z[i]); i++){} 368 *tokenType = keywordCode((char*)z, i); 369 return i; 370 } 371 } 372 *tokenType = TK_ILLEGAL; 373 return 1; 374 } 375 376 /* 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. 382 */ 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 */ 392 393 394 #ifdef SQLITE_ENABLE_API_ARMOR 395 if( zSql==0 || pzErrMsg==0 ) return SQLITE_MISUSE_BKPT; 396 #endif 397 mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH]; 398 if( db->nVdbeActive==0 ){ 399 db->u1.isInterrupted = 0; 400 } 401 pParse->rc = SQLITE_OK; 402 pParse->zTail = zSql; 403 i = 0; 404 assert( pzErrMsg!=0 ); 405 pEngine = sqlite3ParserAlloc(sqlite3Malloc); 406 if( pEngine==0 ){ 407 db->mallocFailed = 1; 408 return SQLITE_NOMEM; 409 } 410 assert( pParse->pNewTable==0 ); 411 assert( pParse->pNewTrigger==0 ); 412 assert( pParse->nVar==0 ); 413 assert( pParse->nzVar==0 ); 414 assert( pParse->azVar==0 ); 415 enableLookaside = db->lookaside.bEnabled; 416 if( db->lookaside.pStart ) db->lookaside.bEnabled = 1; 417 while( !db->mallocFailed && zSql[i]!=0 ){ 418 assert( i>=0 ); 419 pParse->sLastToken.z = &zSql[i]; 420 pParse->sLastToken.n = sqlite3GetToken((unsigned char*)&zSql[i],&tokenType); 421 i += pParse->sLastToken.n; 422 if( i>mxSqlLen ){ 423 pParse->rc = SQLITE_TOOBIG; 424 break; 425 } 426 switch( tokenType ){ 427 case TK_SPACE: { 428 if( db->u1.isInterrupted ){ 429 sqlite3ErrorMsg(pParse, "interrupt"); 430 pParse->rc = SQLITE_INTERRUPT; 431 goto abort_parse; 432 } 433 break; 434 } 435 case TK_ILLEGAL: { 436 sqlite3DbFree(db, *pzErrMsg); 437 *pzErrMsg = sqlite3MPrintf(db, "unrecognized token: \"%T\"", 438 &pParse->sLastToken); 439 nErr++; 440 goto abort_parse; 441 } 442 case TK_SEMI: { 443 pParse->zTail = &zSql[i]; 444 /* Fall thru into the default case */ 445 } 446 default: { 447 sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse); 448 lastTokenParsed = tokenType; 449 if( pParse->rc!=SQLITE_OK ){ 450 goto abort_parse; 451 } 452 break; 453 } 454 } 455 } 456 abort_parse: 457 if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){ 458 if( lastTokenParsed!=TK_SEMI ){ 459 sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse); 460 pParse->zTail = &zSql[i]; 461 } 462 sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse); 463 } 464 #ifdef YYTRACKMAXSTACKDEPTH 465 sqlite3StatusSet(SQLITE_STATUS_PARSER_STACK, 466 sqlite3ParserStackPeak(pEngine) 467 ); 468 #endif /* YYDEBUG */ 469 sqlite3ParserFree(pEngine, sqlite3_free); 470 db->lookaside.bEnabled = enableLookaside; 471 if( db->mallocFailed ){ 472 pParse->rc = SQLITE_NOMEM; 473 } 474 if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){ 475 sqlite3SetString(&pParse->zErrMsg, db, "%s", sqlite3ErrStr(pParse->rc)); 476 } 477 assert( pzErrMsg!=0 ); 478 if( pParse->zErrMsg ){ 479 *pzErrMsg = pParse->zErrMsg; 480 sqlite3_log(pParse->rc, "%s", *pzErrMsg); 481 pParse->zErrMsg = 0; 482 nErr++; 483 } 484 if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){ 485 sqlite3VdbeDelete(pParse->pVdbe); 486 pParse->pVdbe = 0; 487 } 488 #ifndef SQLITE_OMIT_SHARED_CACHE 489 if( pParse->nested==0 ){ 490 sqlite3DbFree(db, pParse->aTableLock); 491 pParse->aTableLock = 0; 492 pParse->nTableLock = 0; 493 } 494 #endif 495 #ifndef SQLITE_OMIT_VIRTUALTABLE 496 sqlite3_free(pParse->apVtabLock); 497 #endif 498 499 if( !IN_DECLARE_VTAB ){ 500 /* If the pParse->declareVtab flag is set, do not delete any table 501 ** structure built up in pParse->pNewTable. The calling code (see vtab.c) 502 ** will take responsibility for freeing the Table structure. 503 */ 504 sqlite3DeleteTable(db, pParse->pNewTable); 505 } 506 507 if( pParse->bFreeWith ) sqlite3WithDelete(db, pParse->pWith); 508 sqlite3DeleteTrigger(db, pParse->pNewTrigger); 509 for(i=pParse->nzVar-1; i>=0; i--) sqlite3DbFree(db, pParse->azVar[i]); 510 sqlite3DbFree(db, pParse->azVar); 511 while( pParse->pAinc ){ 512 AutoincInfo *p = pParse->pAinc; 513 pParse->pAinc = p->pNext; 514 sqlite3DbFree(db, p); 515 } 516 while( pParse->pZombieTab ){ 517 Table *p = pParse->pZombieTab; 518 pParse->pZombieTab = p->pNextZombie; 519 sqlite3DeleteTable(db, p); 520 } 521 if( nErr>0 && pParse->rc==SQLITE_OK ){ 522 pParse->rc = SQLITE_ERROR; 523 } 524 return nErr; 525 } 526