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 /* Character classes for tokenizing 22 ** 23 ** In the sqlite3GetToken() function, a switch() on aiClass[c] is implemented 24 ** using a lookup table, whereas a switch() directly on c uses a binary search. 25 ** The lookup table is much faster. To maximize speed, and to ensure that 26 ** a lookup table is used, all of the classes need to be small integers and 27 ** all of them need to be used within the switch. 28 */ 29 #define CC_X 0 /* The letter 'x', or start of BLOB literal */ 30 #define CC_KYWD 1 /* Alphabetics or '_'. Usable in a keyword */ 31 #define CC_ID 2 /* unicode characters usable in IDs */ 32 #define CC_DIGIT 3 /* Digits */ 33 #define CC_DOLLAR 4 /* '$' */ 34 #define CC_VARALPHA 5 /* '@', '#', ':'. Alphabetic SQL variables */ 35 #define CC_VARNUM 6 /* '?'. Numeric SQL variables */ 36 #define CC_SPACE 7 /* Space characters */ 37 #define CC_QUOTE 8 /* '"', '\'', or '`'. String literals, quoted ids */ 38 #define CC_QUOTE2 9 /* '['. [...] style quoted ids */ 39 #define CC_PIPE 10 /* '|'. Bitwise OR or concatenate */ 40 #define CC_MINUS 11 /* '-'. Minus or SQL-style comment */ 41 #define CC_LT 12 /* '<'. Part of < or <= or <> */ 42 #define CC_GT 13 /* '>'. Part of > or >= */ 43 #define CC_EQ 14 /* '='. Part of = or == */ 44 #define CC_BANG 15 /* '!'. Part of != */ 45 #define CC_SLASH 16 /* '/'. / or c-style comment */ 46 #define CC_LP 17 /* '(' */ 47 #define CC_RP 18 /* ')' */ 48 #define CC_SEMI 19 /* ';' */ 49 #define CC_PLUS 20 /* '+' */ 50 #define CC_STAR 21 /* '*' */ 51 #define CC_PERCENT 22 /* '%' */ 52 #define CC_COMMA 23 /* ',' */ 53 #define CC_AND 24 /* '&' */ 54 #define CC_TILDA 25 /* '~' */ 55 #define CC_DOT 26 /* '.' */ 56 #define CC_ILLEGAL 27 /* Illegal character */ 57 #define CC_NUL 28 /* 0x00 */ 58 59 static const unsigned char aiClass[] = { 60 #ifdef SQLITE_ASCII 61 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */ 62 /* 0x */ 28, 27, 27, 27, 27, 27, 27, 27, 27, 7, 7, 27, 7, 7, 27, 27, 63 /* 1x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 64 /* 2x */ 7, 15, 8, 5, 4, 22, 24, 8, 17, 18, 21, 20, 23, 11, 26, 16, 65 /* 3x */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 19, 12, 14, 13, 6, 66 /* 4x */ 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 67 /* 5x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 9, 27, 27, 27, 1, 68 /* 6x */ 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 69 /* 7x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 27, 10, 27, 25, 27, 70 /* 8x */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 71 /* 9x */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 72 /* Ax */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 73 /* Bx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 74 /* Cx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 75 /* Dx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 76 /* Ex */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 77 /* Fx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 78 #endif 79 #ifdef SQLITE_EBCDIC 80 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */ 81 /* 0x */ 27, 27, 27, 27, 27, 7, 27, 27, 27, 27, 27, 27, 7, 7, 27, 27, 82 /* 1x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 83 /* 2x */ 27, 27, 27, 27, 27, 7, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 84 /* 3x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 85 /* 4x */ 7, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 26, 12, 17, 20, 10, 86 /* 5x */ 24, 27, 27, 27, 27, 27, 27, 27, 27, 27, 15, 4, 21, 18, 19, 27, 87 /* 6x */ 11, 16, 27, 27, 27, 27, 27, 27, 27, 27, 27, 23, 22, 1, 13, 6, 88 /* 7x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 8, 5, 5, 5, 8, 14, 8, 89 /* 8x */ 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 27, 27, 27, 27, 27, 27, 90 /* 9x */ 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 27, 27, 27, 27, 27, 27, 91 /* Ax */ 27, 25, 1, 1, 1, 1, 1, 0, 1, 1, 27, 27, 27, 27, 27, 27, 92 /* Bx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 9, 27, 27, 27, 27, 27, 93 /* Cx */ 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 27, 27, 27, 27, 27, 27, 94 /* Dx */ 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 27, 27, 27, 27, 27, 27, 95 /* Ex */ 27, 27, 1, 1, 1, 1, 1, 0, 1, 1, 27, 27, 27, 27, 27, 27, 96 /* Fx */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 27, 27, 27, 27, 27, 27, 97 #endif 98 }; 99 100 /* 101 ** The charMap() macro maps alphabetic characters (only) into their 102 ** lower-case ASCII equivalent. On ASCII machines, this is just 103 ** an upper-to-lower case map. On EBCDIC machines we also need 104 ** to adjust the encoding. The mapping is only valid for alphabetics 105 ** which are the only characters for which this feature is used. 106 ** 107 ** Used by keywordhash.h 108 */ 109 #ifdef SQLITE_ASCII 110 # define charMap(X) sqlite3UpperToLower[(unsigned char)X] 111 #endif 112 #ifdef SQLITE_EBCDIC 113 # define charMap(X) ebcdicToAscii[(unsigned char)X] 114 const unsigned char ebcdicToAscii[] = { 115 /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */ 116 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */ 117 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */ 118 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */ 119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3x */ 120 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4x */ 121 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5x */ 122 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 0, 0, /* 6x */ 123 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7x */ 124 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* 8x */ 125 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* 9x */ 126 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ax */ 127 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */ 128 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* Cx */ 129 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* Dx */ 130 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ex */ 131 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Fx */ 132 }; 133 #endif 134 135 /* 136 ** The sqlite3KeywordCode function looks up an identifier to determine if 137 ** it is a keyword. If it is a keyword, the token code of that keyword is 138 ** returned. If the input is not a keyword, TK_ID is returned. 139 ** 140 ** The implementation of this routine was generated by a program, 141 ** mkkeywordhash.c, located in the tool subdirectory of the distribution. 142 ** The output of the mkkeywordhash.c program is written into a file 143 ** named keywordhash.h and then included into this source file by 144 ** the #include below. 145 */ 146 #include "keywordhash.h" 147 148 149 /* 150 ** If X is a character that can be used in an identifier then 151 ** IdChar(X) will be true. Otherwise it is false. 152 ** 153 ** For ASCII, any character with the high-order bit set is 154 ** allowed in an identifier. For 7-bit characters, 155 ** sqlite3IsIdChar[X] must be 1. 156 ** 157 ** For EBCDIC, the rules are more complex but have the same 158 ** end result. 159 ** 160 ** Ticket #1066. the SQL standard does not allow '$' in the 161 ** middle of identifiers. But many SQL implementations do. 162 ** SQLite will allow '$' in identifiers for compatibility. 163 ** But the feature is undocumented. 164 */ 165 #ifdef SQLITE_ASCII 166 #define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0) 167 #endif 168 #ifdef SQLITE_EBCDIC 169 const char sqlite3IsEbcdicIdChar[] = { 170 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */ 171 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 4x */ 172 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, /* 5x */ 173 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, /* 6x */ 174 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, /* 7x */ 175 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, /* 8x */ 176 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, /* 9x */ 177 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, /* Ax */ 178 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */ 179 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Cx */ 180 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Dx */ 181 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Ex */ 182 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, /* Fx */ 183 }; 184 #define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40])) 185 #endif 186 187 /* Make the IdChar function accessible from ctime.c and alter.c */ 188 int sqlite3IsIdChar(u8 c){ return IdChar(c); } 189 190 #ifndef SQLITE_OMIT_WINDOWFUNC 191 /* 192 ** Return the id of the next token in string (*pz). Before returning, set 193 ** (*pz) to point to the byte following the parsed token. 194 */ 195 static int getToken(const unsigned char **pz){ 196 const unsigned char *z = *pz; 197 int t; /* Token type to return */ 198 do { 199 z += sqlite3GetToken(z, &t); 200 }while( t==TK_SPACE ); 201 if( t==TK_ID 202 || t==TK_STRING 203 || t==TK_JOIN_KW 204 || t==TK_WINDOW 205 || t==TK_OVER 206 || sqlite3ParserFallback(t)==TK_ID 207 ){ 208 t = TK_ID; 209 } 210 *pz = z; 211 return t; 212 } 213 214 /* 215 ** The following three functions are called immediately after the tokenizer 216 ** reads the keywords WINDOW, OVER and FILTER, respectively, to determine 217 ** whether the token should be treated as a keyword or an SQL identifier. 218 ** This cannot be handled by the usual lemon %fallback method, due to 219 ** the ambiguity in some constructions. e.g. 220 ** 221 ** SELECT sum(x) OVER ... 222 ** 223 ** In the above, "OVER" might be a keyword, or it might be an alias for the 224 ** sum(x) expression. If a "%fallback ID OVER" directive were added to 225 ** grammar, then SQLite would always treat "OVER" as an alias, making it 226 ** impossible to call a window-function without a FILTER clause. 227 ** 228 ** WINDOW is treated as a keyword if: 229 ** 230 ** * the following token is an identifier, or a keyword that can fallback 231 ** to being an identifier, and 232 ** * the token after than one is TK_AS. 233 ** 234 ** OVER is a keyword if: 235 ** 236 ** * the previous token was TK_RP, and 237 ** * the next token is either TK_LP or an identifier. 238 ** 239 ** FILTER is a keyword if: 240 ** 241 ** * the previous token was TK_RP, and 242 ** * the next token is TK_LP. 243 */ 244 static int analyzeWindowKeyword(const unsigned char *z){ 245 int t; 246 t = getToken(&z); 247 if( t!=TK_ID ) return TK_ID; 248 t = getToken(&z); 249 if( t!=TK_AS ) return TK_ID; 250 return TK_WINDOW; 251 } 252 static int analyzeOverKeyword(const unsigned char *z, int lastToken){ 253 if( lastToken==TK_RP ){ 254 int t = getToken(&z); 255 if( t==TK_LP || t==TK_ID ) return TK_OVER; 256 } 257 return TK_ID; 258 } 259 static int analyzeFilterKeyword(const unsigned char *z, int lastToken){ 260 if( lastToken==TK_RP && getToken(&z)==TK_LP ){ 261 return TK_FILTER; 262 } 263 return TK_ID; 264 } 265 #endif /* SQLITE_OMIT_WINDOWFUNC */ 266 267 /* 268 ** Return the length (in bytes) of the token that begins at z[0]. 269 ** Store the token type in *tokenType before returning. 270 */ 271 int sqlite3GetToken(const unsigned char *z, int *tokenType){ 272 int i, c; 273 switch( aiClass[*z] ){ /* Switch on the character-class of the first byte 274 ** of the token. See the comment on the CC_ defines 275 ** above. */ 276 case CC_SPACE: { 277 testcase( z[0]==' ' ); 278 testcase( z[0]=='\t' ); 279 testcase( z[0]=='\n' ); 280 testcase( z[0]=='\f' ); 281 testcase( z[0]=='\r' ); 282 for(i=1; sqlite3Isspace(z[i]); i++){} 283 *tokenType = TK_SPACE; 284 return i; 285 } 286 case CC_MINUS: { 287 if( z[1]=='-' ){ 288 for(i=2; (c=z[i])!=0 && c!='\n'; i++){} 289 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */ 290 return i; 291 } 292 *tokenType = TK_MINUS; 293 return 1; 294 } 295 case CC_LP: { 296 *tokenType = TK_LP; 297 return 1; 298 } 299 case CC_RP: { 300 *tokenType = TK_RP; 301 return 1; 302 } 303 case CC_SEMI: { 304 *tokenType = TK_SEMI; 305 return 1; 306 } 307 case CC_PLUS: { 308 *tokenType = TK_PLUS; 309 return 1; 310 } 311 case CC_STAR: { 312 *tokenType = TK_STAR; 313 return 1; 314 } 315 case CC_SLASH: { 316 if( z[1]!='*' || z[2]==0 ){ 317 *tokenType = TK_SLASH; 318 return 1; 319 } 320 for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){} 321 if( c ) i++; 322 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */ 323 return i; 324 } 325 case CC_PERCENT: { 326 *tokenType = TK_REM; 327 return 1; 328 } 329 case CC_EQ: { 330 *tokenType = TK_EQ; 331 return 1 + (z[1]=='='); 332 } 333 case CC_LT: { 334 if( (c=z[1])=='=' ){ 335 *tokenType = TK_LE; 336 return 2; 337 }else if( c=='>' ){ 338 *tokenType = TK_NE; 339 return 2; 340 }else if( c=='<' ){ 341 *tokenType = TK_LSHIFT; 342 return 2; 343 }else{ 344 *tokenType = TK_LT; 345 return 1; 346 } 347 } 348 case CC_GT: { 349 if( (c=z[1])=='=' ){ 350 *tokenType = TK_GE; 351 return 2; 352 }else if( c=='>' ){ 353 *tokenType = TK_RSHIFT; 354 return 2; 355 }else{ 356 *tokenType = TK_GT; 357 return 1; 358 } 359 } 360 case CC_BANG: { 361 if( z[1]!='=' ){ 362 *tokenType = TK_ILLEGAL; 363 return 1; 364 }else{ 365 *tokenType = TK_NE; 366 return 2; 367 } 368 } 369 case CC_PIPE: { 370 if( z[1]!='|' ){ 371 *tokenType = TK_BITOR; 372 return 1; 373 }else{ 374 *tokenType = TK_CONCAT; 375 return 2; 376 } 377 } 378 case CC_COMMA: { 379 *tokenType = TK_COMMA; 380 return 1; 381 } 382 case CC_AND: { 383 *tokenType = TK_BITAND; 384 return 1; 385 } 386 case CC_TILDA: { 387 *tokenType = TK_BITNOT; 388 return 1; 389 } 390 case CC_QUOTE: { 391 int delim = z[0]; 392 testcase( delim=='`' ); 393 testcase( delim=='\'' ); 394 testcase( delim=='"' ); 395 for(i=1; (c=z[i])!=0; i++){ 396 if( c==delim ){ 397 if( z[i+1]==delim ){ 398 i++; 399 }else{ 400 break; 401 } 402 } 403 } 404 if( c=='\'' ){ 405 *tokenType = TK_STRING; 406 return i+1; 407 }else if( c!=0 ){ 408 *tokenType = TK_ID; 409 return i+1; 410 }else{ 411 *tokenType = TK_ILLEGAL; 412 return i; 413 } 414 } 415 case CC_DOT: { 416 #ifndef SQLITE_OMIT_FLOATING_POINT 417 if( !sqlite3Isdigit(z[1]) ) 418 #endif 419 { 420 *tokenType = TK_DOT; 421 return 1; 422 } 423 /* If the next character is a digit, this is a floating point 424 ** number that begins with ".". Fall thru into the next case */ 425 } 426 case CC_DIGIT: { 427 testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' ); 428 testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' ); 429 testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' ); 430 testcase( z[0]=='9' ); 431 *tokenType = TK_INTEGER; 432 #ifndef SQLITE_OMIT_HEX_INTEGER 433 if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){ 434 for(i=3; sqlite3Isxdigit(z[i]); i++){} 435 return i; 436 } 437 #endif 438 for(i=0; sqlite3Isdigit(z[i]); i++){} 439 #ifndef SQLITE_OMIT_FLOATING_POINT 440 if( z[i]=='.' ){ 441 i++; 442 while( sqlite3Isdigit(z[i]) ){ i++; } 443 *tokenType = TK_FLOAT; 444 } 445 if( (z[i]=='e' || z[i]=='E') && 446 ( sqlite3Isdigit(z[i+1]) 447 || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2])) 448 ) 449 ){ 450 i += 2; 451 while( sqlite3Isdigit(z[i]) ){ i++; } 452 *tokenType = TK_FLOAT; 453 } 454 #endif 455 while( IdChar(z[i]) ){ 456 *tokenType = TK_ILLEGAL; 457 i++; 458 } 459 return i; 460 } 461 case CC_QUOTE2: { 462 for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){} 463 *tokenType = c==']' ? TK_ID : TK_ILLEGAL; 464 return i; 465 } 466 case CC_VARNUM: { 467 *tokenType = TK_VARIABLE; 468 for(i=1; sqlite3Isdigit(z[i]); i++){} 469 return i; 470 } 471 case CC_DOLLAR: 472 case CC_VARALPHA: { 473 int n = 0; 474 testcase( z[0]=='$' ); testcase( z[0]=='@' ); 475 testcase( z[0]==':' ); testcase( z[0]=='#' ); 476 *tokenType = TK_VARIABLE; 477 for(i=1; (c=z[i])!=0; i++){ 478 if( IdChar(c) ){ 479 n++; 480 #ifndef SQLITE_OMIT_TCL_VARIABLE 481 }else if( c=='(' && n>0 ){ 482 do{ 483 i++; 484 }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' ); 485 if( c==')' ){ 486 i++; 487 }else{ 488 *tokenType = TK_ILLEGAL; 489 } 490 break; 491 }else if( c==':' && z[i+1]==':' ){ 492 i++; 493 #endif 494 }else{ 495 break; 496 } 497 } 498 if( n==0 ) *tokenType = TK_ILLEGAL; 499 return i; 500 } 501 case CC_KYWD: { 502 for(i=1; aiClass[z[i]]<=CC_KYWD; i++){} 503 if( IdChar(z[i]) ){ 504 /* This token started out using characters that can appear in keywords, 505 ** but z[i] is a character not allowed within keywords, so this must 506 ** be an identifier instead */ 507 i++; 508 break; 509 } 510 *tokenType = TK_ID; 511 return keywordCode((char*)z, i, tokenType); 512 } 513 case CC_X: { 514 #ifndef SQLITE_OMIT_BLOB_LITERAL 515 testcase( z[0]=='x' ); testcase( z[0]=='X' ); 516 if( z[1]=='\'' ){ 517 *tokenType = TK_BLOB; 518 for(i=2; sqlite3Isxdigit(z[i]); i++){} 519 if( z[i]!='\'' || i%2 ){ 520 *tokenType = TK_ILLEGAL; 521 while( z[i] && z[i]!='\'' ){ i++; } 522 } 523 if( z[i] ) i++; 524 return i; 525 } 526 #endif 527 /* If it is not a BLOB literal, then it must be an ID, since no 528 ** SQL keywords start with the letter 'x'. Fall through */ 529 } 530 case CC_ID: { 531 i = 1; 532 break; 533 } 534 case CC_NUL: { 535 *tokenType = TK_ILLEGAL; 536 return 0; 537 } 538 default: { 539 *tokenType = TK_ILLEGAL; 540 return 1; 541 } 542 } 543 while( IdChar(z[i]) ){ i++; } 544 *tokenType = TK_ID; 545 return i; 546 } 547 548 /* 549 ** Run the parser on the given SQL string. The parser structure is 550 ** passed in. An SQLITE_ status code is returned. If an error occurs 551 ** then an and attempt is made to write an error message into 552 ** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that 553 ** error message. 554 */ 555 int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){ 556 int nErr = 0; /* Number of errors encountered */ 557 void *pEngine; /* The LEMON-generated LALR(1) parser */ 558 int n = 0; /* Length of the next token token */ 559 int tokenType; /* type of the next token */ 560 int lastTokenParsed = -1; /* type of the previous token */ 561 sqlite3 *db = pParse->db; /* The database connection */ 562 int mxSqlLen; /* Max length of an SQL string */ 563 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 564 yyParser sEngine; /* Space to hold the Lemon-generated Parser object */ 565 #endif 566 VVA_ONLY( u8 startedWithOom = db->mallocFailed ); 567 568 assert( zSql!=0 ); 569 mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH]; 570 if( db->nVdbeActive==0 ){ 571 db->u1.isInterrupted = 0; 572 } 573 pParse->rc = SQLITE_OK; 574 pParse->zTail = zSql; 575 assert( pzErrMsg!=0 ); 576 #ifdef SQLITE_DEBUG 577 if( db->flags & SQLITE_ParserTrace ){ 578 printf("parser: [[[%s]]]\n", zSql); 579 sqlite3ParserTrace(stdout, "parser: "); 580 }else{ 581 sqlite3ParserTrace(0, 0); 582 } 583 #endif 584 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 585 pEngine = &sEngine; 586 sqlite3ParserInit(pEngine, pParse); 587 #else 588 pEngine = sqlite3ParserAlloc(sqlite3Malloc, pParse); 589 if( pEngine==0 ){ 590 sqlite3OomFault(db); 591 return SQLITE_NOMEM_BKPT; 592 } 593 #endif 594 assert( pParse->pNewTable==0 ); 595 assert( pParse->pNewTrigger==0 ); 596 assert( pParse->nVar==0 ); 597 assert( pParse->pVList==0 ); 598 pParse->pParentParse = db->pParse; 599 db->pParse = pParse; 600 while( 1 ){ 601 n = sqlite3GetToken((u8*)zSql, &tokenType); 602 mxSqlLen -= n; 603 if( mxSqlLen<0 ){ 604 pParse->rc = SQLITE_TOOBIG; 605 break; 606 } 607 #ifndef SQLITE_OMIT_WINDOWFUNC 608 if( tokenType>=TK_WINDOW ){ 609 assert( tokenType==TK_SPACE || tokenType==TK_OVER || tokenType==TK_FILTER 610 || tokenType==TK_ILLEGAL || tokenType==TK_WINDOW 611 ); 612 #else 613 if( tokenType>=TK_SPACE ){ 614 assert( tokenType==TK_SPACE || tokenType==TK_ILLEGAL ); 615 #endif /* SQLITE_OMIT_WINDOWFUNC */ 616 if( db->u1.isInterrupted ){ 617 pParse->rc = SQLITE_INTERRUPT; 618 break; 619 } 620 if( tokenType==TK_SPACE ){ 621 zSql += n; 622 continue; 623 } 624 if( zSql[0]==0 ){ 625 /* Upon reaching the end of input, call the parser two more times 626 ** with tokens TK_SEMI and 0, in that order. */ 627 if( lastTokenParsed==TK_SEMI ){ 628 tokenType = 0; 629 }else if( lastTokenParsed==0 ){ 630 break; 631 }else{ 632 tokenType = TK_SEMI; 633 } 634 n = 0; 635 #ifndef SQLITE_OMIT_WINDOWFUNC 636 }else if( tokenType==TK_WINDOW ){ 637 assert( n==6 ); 638 tokenType = analyzeWindowKeyword((const u8*)&zSql[6]); 639 }else if( tokenType==TK_OVER ){ 640 assert( n==4 ); 641 tokenType = analyzeOverKeyword((const u8*)&zSql[4], lastTokenParsed); 642 }else if( tokenType==TK_FILTER ){ 643 assert( n==6 ); 644 tokenType = analyzeFilterKeyword((const u8*)&zSql[6], lastTokenParsed); 645 #endif /* SQLITE_OMIT_WINDOWFUNC */ 646 }else{ 647 sqlite3ErrorMsg(pParse, "unrecognized token: \"%.*s\"", n, zSql); 648 break; 649 } 650 } 651 pParse->sLastToken.z = zSql; 652 pParse->sLastToken.n = n; 653 sqlite3Parser(pEngine, tokenType, pParse->sLastToken); 654 lastTokenParsed = tokenType; 655 zSql += n; 656 assert( db->mallocFailed==0 || pParse->rc!=SQLITE_OK || startedWithOom ); 657 if( pParse->rc!=SQLITE_OK ) break; 658 } 659 assert( nErr==0 ); 660 #ifdef YYTRACKMAXSTACKDEPTH 661 sqlite3_mutex_enter(sqlite3MallocMutex()); 662 sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK, 663 sqlite3ParserStackPeak(pEngine) 664 ); 665 sqlite3_mutex_leave(sqlite3MallocMutex()); 666 #endif /* YYDEBUG */ 667 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 668 sqlite3ParserFinalize(pEngine); 669 #else 670 sqlite3ParserFree(pEngine, sqlite3_free); 671 #endif 672 if( db->mallocFailed ){ 673 pParse->rc = SQLITE_NOMEM_BKPT; 674 } 675 if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){ 676 pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc)); 677 } 678 assert( pzErrMsg!=0 ); 679 if( pParse->zErrMsg ){ 680 *pzErrMsg = pParse->zErrMsg; 681 sqlite3_log(pParse->rc, "%s in \"%s\"", 682 *pzErrMsg, pParse->zTail); 683 pParse->zErrMsg = 0; 684 nErr++; 685 } 686 pParse->zTail = zSql; 687 if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){ 688 sqlite3VdbeDelete(pParse->pVdbe); 689 pParse->pVdbe = 0; 690 } 691 #ifndef SQLITE_OMIT_SHARED_CACHE 692 if( pParse->nested==0 ){ 693 sqlite3DbFree(db, pParse->aTableLock); 694 pParse->aTableLock = 0; 695 pParse->nTableLock = 0; 696 } 697 #endif 698 #ifndef SQLITE_OMIT_VIRTUALTABLE 699 sqlite3_free(pParse->apVtabLock); 700 #endif 701 702 if( !IN_SPECIAL_PARSE ){ 703 /* If the pParse->declareVtab flag is set, do not delete any table 704 ** structure built up in pParse->pNewTable. The calling code (see vtab.c) 705 ** will take responsibility for freeing the Table structure. 706 */ 707 sqlite3DeleteTable(db, pParse->pNewTable); 708 } 709 if( !IN_RENAME_OBJECT ){ 710 sqlite3DeleteTrigger(db, pParse->pNewTrigger); 711 } 712 713 if( pParse->pWithToFree ) sqlite3WithDelete(db, pParse->pWithToFree); 714 sqlite3DbFree(db, pParse->pVList); 715 while( pParse->pAinc ){ 716 AutoincInfo *p = pParse->pAinc; 717 pParse->pAinc = p->pNext; 718 sqlite3DbFreeNN(db, p); 719 } 720 while( pParse->pZombieTab ){ 721 Table *p = pParse->pZombieTab; 722 pParse->pZombieTab = p->pNextZombie; 723 sqlite3DeleteTable(db, p); 724 } 725 db->pParse = pParse->pParentParse; 726 pParse->pParentParse = 0; 727 assert( nErr==0 || pParse->rc!=SQLITE_OK ); 728 return nErr; 729 } 730 731 732 #ifdef SQLITE_ENABLE_NORMALIZE 733 /* 734 ** Insert a single space character into pStr if the current string 735 ** ends with an identifier 736 */ 737 static void addSpaceSeparator(sqlite3_str *pStr){ 738 if( pStr->nChar && sqlite3IsIdChar(pStr->zText[pStr->nChar-1]) ){ 739 sqlite3_str_append(pStr, " ", 1); 740 } 741 } 742 743 /* 744 ** Compute a normalization of the SQL given by zSql[0..nSql-1]. Return 745 ** the normalization in space obtained from sqlite3DbMalloc(). Or return 746 ** NULL if anything goes wrong or if zSql is NULL. 747 */ 748 char *sqlite3Normalize( 749 Vdbe *pVdbe, /* VM being reprepared */ 750 const char *zSql /* The original SQL string */ 751 ){ 752 sqlite3 *db; /* The database connection */ 753 int i; /* Next unread byte of zSql[] */ 754 int n; /* length of current token */ 755 int tokenType; /* type of current token */ 756 int prevType = 0; /* Previous non-whitespace token */ 757 int nParen; /* Number of nested levels of parentheses */ 758 int iStartIN; /* Start of RHS of IN operator in z[] */ 759 int nParenAtIN; /* Value of nParent at start of RHS of IN operator */ 760 int j; /* Bytes of normalized SQL generated so far */ 761 sqlite3_str *pStr; /* The normalized SQL string under construction */ 762 763 db = sqlite3VdbeDb(pVdbe); 764 tokenType = -1; 765 nParen = iStartIN = nParenAtIN = 0; 766 pStr = sqlite3_str_new(db); 767 assert( pStr!=0 ); /* sqlite3_str_new() never returns NULL */ 768 for(i=0; zSql[i] && pStr->accError==0; i+=n){ 769 if( tokenType!=TK_SPACE ){ 770 prevType = tokenType; 771 } 772 n = sqlite3GetToken((unsigned char*)zSql+i, &tokenType); 773 if( NEVER(n<=0) ) break; 774 switch( tokenType ){ 775 case TK_SPACE: { 776 break; 777 } 778 case TK_NULL: { 779 if( prevType==TK_IS || prevType==TK_NOT ){ 780 sqlite3_str_append(pStr, " NULL", 5); 781 break; 782 } 783 /* Fall through */ 784 } 785 case TK_STRING: 786 case TK_INTEGER: 787 case TK_FLOAT: 788 case TK_VARIABLE: 789 case TK_BLOB: { 790 sqlite3_str_append(pStr, "?", 1); 791 break; 792 } 793 case TK_LP: { 794 nParen++; 795 if( prevType==TK_IN ){ 796 iStartIN = pStr->nChar; 797 nParenAtIN = nParen; 798 } 799 sqlite3_str_append(pStr, "(", 1); 800 break; 801 } 802 case TK_RP: { 803 if( iStartIN>0 && nParen==nParenAtIN ){ 804 assert( pStr->nChar>=iStartIN ); 805 pStr->nChar = iStartIN+1; 806 sqlite3_str_append(pStr, "?,?,?", 5); 807 iStartIN = 0; 808 } 809 nParen--; 810 sqlite3_str_append(pStr, ")", 1); 811 break; 812 } 813 case TK_ID: { 814 iStartIN = 0; 815 j = pStr->nChar; 816 if( sqlite3Isquote(zSql[i]) ){ 817 char *zId = sqlite3DbStrNDup(db, zSql+i, n); 818 int nId; 819 int eType = 0; 820 if( zId==0 ) break; 821 sqlite3Dequote(zId); 822 if( zSql[i]=='"' && sqlite3VdbeUsesDoubleQuotedString(pVdbe, zId) ){ 823 sqlite3_str_append(pStr, "?", 1); 824 sqlite3DbFree(db, zId); 825 break; 826 } 827 nId = sqlite3Strlen30(zId); 828 if( sqlite3GetToken((u8*)zId, &eType)==nId && eType==TK_ID ){ 829 addSpaceSeparator(pStr); 830 sqlite3_str_append(pStr, zId, nId); 831 }else{ 832 sqlite3_str_appendf(pStr, "\"%w\"", zId); 833 } 834 sqlite3DbFree(db, zId); 835 }else{ 836 addSpaceSeparator(pStr); 837 sqlite3_str_append(pStr, zSql+i, n); 838 } 839 while( j<pStr->nChar ){ 840 pStr->zText[j] = sqlite3Tolower(pStr->zText[j]); 841 j++; 842 } 843 break; 844 } 845 case TK_SELECT: { 846 iStartIN = 0; 847 /* fall through */ 848 } 849 default: { 850 if( sqlite3IsIdChar(zSql[i]) ) addSpaceSeparator(pStr); 851 j = pStr->nChar; 852 sqlite3_str_append(pStr, zSql+i, n); 853 while( j<pStr->nChar ){ 854 pStr->zText[j] = sqlite3Toupper(pStr->zText[j]); 855 j++; 856 } 857 break; 858 } 859 } 860 } 861 if( tokenType!=TK_SEMI ) sqlite3_str_append(pStr, ";", 1); 862 return sqlite3_str_finish(pStr); 863 } 864 #endif /* SQLITE_ENABLE_NORMALIZE */ 865