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_KYWD0 1 /* First letter of a keyword */ 31 #define CC_KYWD 2 /* Alphabetics or '_'. Usable in a keyword */ 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_ID 27 /* unicode characters usable in IDs */ 57 #define CC_ILLEGAL 28 /* Illegal character */ 58 #define CC_NUL 29 /* 0x00 */ 59 #define CC_BOM 30 /* First byte of UTF8 BOM: 0xEF 0xBB 0xBF */ 60 61 static const unsigned char aiClass[] = { 62 #ifdef SQLITE_ASCII 63 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */ 64 /* 0x */ 29, 28, 28, 28, 28, 28, 28, 28, 28, 7, 7, 28, 7, 7, 28, 28, 65 /* 1x */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 66 /* 2x */ 7, 15, 8, 5, 4, 22, 24, 8, 17, 18, 21, 20, 23, 11, 26, 16, 67 /* 3x */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 19, 12, 14, 13, 6, 68 /* 4x */ 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 69 /* 5x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 2, 2, 9, 28, 28, 28, 2, 70 /* 6x */ 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 71 /* 7x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 2, 2, 28, 10, 28, 25, 28, 72 /* 8x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 73 /* 9x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 74 /* Ax */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 75 /* Bx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 76 /* Cx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 77 /* Dx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 78 /* Ex */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 30, 79 /* Fx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27 80 #endif 81 #ifdef SQLITE_EBCDIC 82 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */ 83 /* 0x */ 29, 28, 28, 28, 28, 7, 28, 28, 28, 28, 28, 28, 7, 7, 28, 28, 84 /* 1x */ 28, 28, 28, 28, 28, 7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 85 /* 2x */ 28, 28, 28, 28, 28, 7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 86 /* 3x */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 87 /* 4x */ 7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 26, 12, 17, 20, 10, 88 /* 5x */ 24, 28, 28, 28, 28, 28, 28, 28, 28, 28, 15, 4, 21, 18, 19, 28, 89 /* 6x */ 11, 16, 28, 28, 28, 28, 28, 28, 28, 28, 28, 23, 22, 2, 13, 6, 90 /* 7x */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 8, 5, 5, 5, 8, 14, 8, 91 /* 8x */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28, 92 /* 9x */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28, 93 /* Ax */ 28, 25, 1, 1, 1, 1, 1, 0, 2, 2, 28, 28, 28, 28, 28, 28, 94 /* Bx */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 9, 28, 28, 28, 28, 28, 95 /* Cx */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28, 96 /* Dx */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28, 97 /* Ex */ 28, 28, 1, 1, 1, 1, 1, 0, 2, 2, 28, 28, 28, 28, 28, 28, 98 /* Fx */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 28, 28, 28, 28, 28, 28, 99 #endif 100 }; 101 102 /* 103 ** The charMap() macro maps alphabetic characters (only) into their 104 ** lower-case ASCII equivalent. On ASCII machines, this is just 105 ** an upper-to-lower case map. On EBCDIC machines we also need 106 ** to adjust the encoding. The mapping is only valid for alphabetics 107 ** which are the only characters for which this feature is used. 108 ** 109 ** Used by keywordhash.h 110 */ 111 #ifdef SQLITE_ASCII 112 # define charMap(X) sqlite3UpperToLower[(unsigned char)X] 113 #endif 114 #ifdef SQLITE_EBCDIC 115 # define charMap(X) ebcdicToAscii[(unsigned char)X] 116 const unsigned char ebcdicToAscii[] = { 117 /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */ 118 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */ 119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */ 120 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */ 121 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3x */ 122 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4x */ 123 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5x */ 124 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 0, 0, /* 6x */ 125 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7x */ 126 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* 8x */ 127 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* 9x */ 128 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ax */ 129 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */ 130 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* Cx */ 131 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* Dx */ 132 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ex */ 133 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Fx */ 134 }; 135 #endif 136 137 /* 138 ** The sqlite3KeywordCode function looks up an identifier to determine if 139 ** it is a keyword. If it is a keyword, the token code of that keyword is 140 ** returned. If the input is not a keyword, TK_ID is returned. 141 ** 142 ** The implementation of this routine was generated by a program, 143 ** mkkeywordhash.c, located in the tool subdirectory of the distribution. 144 ** The output of the mkkeywordhash.c program is written into a file 145 ** named keywordhash.h and then included into this source file by 146 ** the #include below. 147 */ 148 #include "keywordhash.h" 149 150 151 /* 152 ** If X is a character that can be used in an identifier then 153 ** IdChar(X) will be true. Otherwise it is false. 154 ** 155 ** For ASCII, any character with the high-order bit set is 156 ** allowed in an identifier. For 7-bit characters, 157 ** sqlite3IsIdChar[X] must be 1. 158 ** 159 ** For EBCDIC, the rules are more complex but have the same 160 ** end result. 161 ** 162 ** Ticket #1066. the SQL standard does not allow '$' in the 163 ** middle of identifiers. But many SQL implementations do. 164 ** SQLite will allow '$' in identifiers for compatibility. 165 ** But the feature is undocumented. 166 */ 167 #ifdef SQLITE_ASCII 168 #define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0) 169 #endif 170 #ifdef SQLITE_EBCDIC 171 const char sqlite3IsEbcdicIdChar[] = { 172 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */ 173 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 4x */ 174 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, /* 5x */ 175 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, /* 6x */ 176 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, /* 7x */ 177 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, /* 8x */ 178 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, /* 9x */ 179 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, /* Ax */ 180 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */ 181 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Cx */ 182 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Dx */ 183 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Ex */ 184 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, /* Fx */ 185 }; 186 #define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40])) 187 #endif 188 189 /* Make the IdChar function accessible from ctime.c and alter.c */ 190 int sqlite3IsIdChar(u8 c){ return IdChar(c); } 191 192 #ifndef SQLITE_OMIT_WINDOWFUNC 193 /* 194 ** Return the id of the next token in string (*pz). Before returning, set 195 ** (*pz) to point to the byte following the parsed token. 196 */ 197 static int getToken(const unsigned char **pz){ 198 const unsigned char *z = *pz; 199 int t; /* Token type to return */ 200 do { 201 z += sqlite3GetToken(z, &t); 202 }while( t==TK_SPACE ); 203 if( t==TK_ID 204 || t==TK_STRING 205 || t==TK_JOIN_KW 206 || t==TK_WINDOW 207 || t==TK_OVER 208 || sqlite3ParserFallback(t)==TK_ID 209 ){ 210 t = TK_ID; 211 } 212 *pz = z; 213 return t; 214 } 215 216 /* 217 ** The following three functions are called immediately after the tokenizer 218 ** reads the keywords WINDOW, OVER and FILTER, respectively, to determine 219 ** whether the token should be treated as a keyword or an SQL identifier. 220 ** This cannot be handled by the usual lemon %fallback method, due to 221 ** the ambiguity in some constructions. e.g. 222 ** 223 ** SELECT sum(x) OVER ... 224 ** 225 ** In the above, "OVER" might be a keyword, or it might be an alias for the 226 ** sum(x) expression. If a "%fallback ID OVER" directive were added to 227 ** grammar, then SQLite would always treat "OVER" as an alias, making it 228 ** impossible to call a window-function without a FILTER clause. 229 ** 230 ** WINDOW is treated as a keyword if: 231 ** 232 ** * the following token is an identifier, or a keyword that can fallback 233 ** to being an identifier, and 234 ** * the token after than one is TK_AS. 235 ** 236 ** OVER is a keyword if: 237 ** 238 ** * the previous token was TK_RP, and 239 ** * the next token is either TK_LP or an identifier. 240 ** 241 ** FILTER is a keyword if: 242 ** 243 ** * the previous token was TK_RP, and 244 ** * the next token is TK_LP. 245 */ 246 static int analyzeWindowKeyword(const unsigned char *z){ 247 int t; 248 t = getToken(&z); 249 if( t!=TK_ID ) return TK_ID; 250 t = getToken(&z); 251 if( t!=TK_AS ) return TK_ID; 252 return TK_WINDOW; 253 } 254 static int analyzeOverKeyword(const unsigned char *z, int lastToken){ 255 if( lastToken==TK_RP ){ 256 int t = getToken(&z); 257 if( t==TK_LP || t==TK_ID ) return TK_OVER; 258 } 259 return TK_ID; 260 } 261 static int analyzeFilterKeyword(const unsigned char *z, int lastToken){ 262 if( lastToken==TK_RP && getToken(&z)==TK_LP ){ 263 return TK_FILTER; 264 } 265 return TK_ID; 266 } 267 #endif /* SQLITE_OMIT_WINDOWFUNC */ 268 269 /* 270 ** Return the length (in bytes) of the token that begins at z[0]. 271 ** Store the token type in *tokenType before returning. 272 */ 273 int sqlite3GetToken(const unsigned char *z, int *tokenType){ 274 int i, c; 275 switch( aiClass[*z] ){ /* Switch on the character-class of the first byte 276 ** of the token. See the comment on the CC_ defines 277 ** above. */ 278 case CC_SPACE: { 279 testcase( z[0]==' ' ); 280 testcase( z[0]=='\t' ); 281 testcase( z[0]=='\n' ); 282 testcase( z[0]=='\f' ); 283 testcase( z[0]=='\r' ); 284 for(i=1; sqlite3Isspace(z[i]); i++){} 285 *tokenType = TK_SPACE; 286 return i; 287 } 288 case CC_MINUS: { 289 if( z[1]=='-' ){ 290 for(i=2; (c=z[i])!=0 && c!='\n'; i++){} 291 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */ 292 return i; 293 } 294 *tokenType = TK_MINUS; 295 return 1; 296 } 297 case CC_LP: { 298 *tokenType = TK_LP; 299 return 1; 300 } 301 case CC_RP: { 302 *tokenType = TK_RP; 303 return 1; 304 } 305 case CC_SEMI: { 306 *tokenType = TK_SEMI; 307 return 1; 308 } 309 case CC_PLUS: { 310 *tokenType = TK_PLUS; 311 return 1; 312 } 313 case CC_STAR: { 314 *tokenType = TK_STAR; 315 return 1; 316 } 317 case CC_SLASH: { 318 if( z[1]!='*' || z[2]==0 ){ 319 *tokenType = TK_SLASH; 320 return 1; 321 } 322 for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){} 323 if( c ) i++; 324 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */ 325 return i; 326 } 327 case CC_PERCENT: { 328 *tokenType = TK_REM; 329 return 1; 330 } 331 case CC_EQ: { 332 *tokenType = TK_EQ; 333 return 1 + (z[1]=='='); 334 } 335 case CC_LT: { 336 if( (c=z[1])=='=' ){ 337 *tokenType = TK_LE; 338 return 2; 339 }else if( c=='>' ){ 340 *tokenType = TK_NE; 341 return 2; 342 }else if( c=='<' ){ 343 *tokenType = TK_LSHIFT; 344 return 2; 345 }else{ 346 *tokenType = TK_LT; 347 return 1; 348 } 349 } 350 case CC_GT: { 351 if( (c=z[1])=='=' ){ 352 *tokenType = TK_GE; 353 return 2; 354 }else if( c=='>' ){ 355 *tokenType = TK_RSHIFT; 356 return 2; 357 }else{ 358 *tokenType = TK_GT; 359 return 1; 360 } 361 } 362 case CC_BANG: { 363 if( z[1]!='=' ){ 364 *tokenType = TK_ILLEGAL; 365 return 1; 366 }else{ 367 *tokenType = TK_NE; 368 return 2; 369 } 370 } 371 case CC_PIPE: { 372 if( z[1]!='|' ){ 373 *tokenType = TK_BITOR; 374 return 1; 375 }else{ 376 *tokenType = TK_CONCAT; 377 return 2; 378 } 379 } 380 case CC_COMMA: { 381 *tokenType = TK_COMMA; 382 return 1; 383 } 384 case CC_AND: { 385 *tokenType = TK_BITAND; 386 return 1; 387 } 388 case CC_TILDA: { 389 *tokenType = TK_BITNOT; 390 return 1; 391 } 392 case CC_QUOTE: { 393 int delim = z[0]; 394 testcase( delim=='`' ); 395 testcase( delim=='\'' ); 396 testcase( delim=='"' ); 397 for(i=1; (c=z[i])!=0; i++){ 398 if( c==delim ){ 399 if( z[i+1]==delim ){ 400 i++; 401 }else{ 402 break; 403 } 404 } 405 } 406 if( c=='\'' ){ 407 *tokenType = TK_STRING; 408 return i+1; 409 }else if( c!=0 ){ 410 *tokenType = TK_ID; 411 return i+1; 412 }else{ 413 *tokenType = TK_ILLEGAL; 414 return i; 415 } 416 } 417 case CC_DOT: { 418 #ifndef SQLITE_OMIT_FLOATING_POINT 419 if( !sqlite3Isdigit(z[1]) ) 420 #endif 421 { 422 *tokenType = TK_DOT; 423 return 1; 424 } 425 /* If the next character is a digit, this is a floating point 426 ** number that begins with ".". Fall thru into the next case */ 427 /* no break */ deliberate_fall_through 428 } 429 case CC_DIGIT: { 430 testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' ); 431 testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' ); 432 testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' ); 433 testcase( z[0]=='9' ); 434 *tokenType = TK_INTEGER; 435 #ifndef SQLITE_OMIT_HEX_INTEGER 436 if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){ 437 for(i=3; sqlite3Isxdigit(z[i]); i++){} 438 return i; 439 } 440 #endif 441 for(i=0; sqlite3Isdigit(z[i]); i++){} 442 #ifndef SQLITE_OMIT_FLOATING_POINT 443 if( z[i]=='.' ){ 444 i++; 445 while( sqlite3Isdigit(z[i]) ){ i++; } 446 *tokenType = TK_FLOAT; 447 } 448 if( (z[i]=='e' || z[i]=='E') && 449 ( sqlite3Isdigit(z[i+1]) 450 || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2])) 451 ) 452 ){ 453 i += 2; 454 while( sqlite3Isdigit(z[i]) ){ i++; } 455 *tokenType = TK_FLOAT; 456 } 457 #endif 458 while( IdChar(z[i]) ){ 459 *tokenType = TK_ILLEGAL; 460 i++; 461 } 462 return i; 463 } 464 case CC_QUOTE2: { 465 for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){} 466 *tokenType = c==']' ? TK_ID : TK_ILLEGAL; 467 return i; 468 } 469 case CC_VARNUM: { 470 *tokenType = TK_VARIABLE; 471 for(i=1; sqlite3Isdigit(z[i]); i++){} 472 return i; 473 } 474 case CC_DOLLAR: 475 case CC_VARALPHA: { 476 int n = 0; 477 testcase( z[0]=='$' ); testcase( z[0]=='@' ); 478 testcase( z[0]==':' ); testcase( z[0]=='#' ); 479 *tokenType = TK_VARIABLE; 480 for(i=1; (c=z[i])!=0; i++){ 481 if( IdChar(c) ){ 482 n++; 483 #ifndef SQLITE_OMIT_TCL_VARIABLE 484 }else if( c=='(' && n>0 ){ 485 do{ 486 i++; 487 }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' ); 488 if( c==')' ){ 489 i++; 490 }else{ 491 *tokenType = TK_ILLEGAL; 492 } 493 break; 494 }else if( c==':' && z[i+1]==':' ){ 495 i++; 496 #endif 497 }else{ 498 break; 499 } 500 } 501 if( n==0 ) *tokenType = TK_ILLEGAL; 502 return i; 503 } 504 case CC_KYWD0: { 505 for(i=1; aiClass[z[i]]<=CC_KYWD; i++){} 506 if( IdChar(z[i]) ){ 507 /* This token started out using characters that can appear in keywords, 508 ** but z[i] is a character not allowed within keywords, so this must 509 ** be an identifier instead */ 510 i++; 511 break; 512 } 513 *tokenType = TK_ID; 514 return keywordCode((char*)z, i, tokenType); 515 } 516 case CC_X: { 517 #ifndef SQLITE_OMIT_BLOB_LITERAL 518 testcase( z[0]=='x' ); testcase( z[0]=='X' ); 519 if( z[1]=='\'' ){ 520 *tokenType = TK_BLOB; 521 for(i=2; sqlite3Isxdigit(z[i]); i++){} 522 if( z[i]!='\'' || i%2 ){ 523 *tokenType = TK_ILLEGAL; 524 while( z[i] && z[i]!='\'' ){ i++; } 525 } 526 if( z[i] ) i++; 527 return i; 528 } 529 #endif 530 /* If it is not a BLOB literal, then it must be an ID, since no 531 ** SQL keywords start with the letter 'x'. Fall through */ 532 /* no break */ deliberate_fall_through 533 } 534 case CC_KYWD: 535 case CC_ID: { 536 i = 1; 537 break; 538 } 539 case CC_BOM: { 540 if( z[1]==0xbb && z[2]==0xbf ){ 541 *tokenType = TK_SPACE; 542 return 3; 543 } 544 i = 1; 545 break; 546 } 547 case CC_NUL: { 548 *tokenType = TK_ILLEGAL; 549 return 0; 550 } 551 default: { 552 *tokenType = TK_ILLEGAL; 553 return 1; 554 } 555 } 556 while( IdChar(z[i]) ){ i++; } 557 *tokenType = TK_ID; 558 return i; 559 } 560 561 /* 562 ** Run the parser on the given SQL string. The parser structure is 563 ** passed in. An SQLITE_ status code is returned. If an error occurs 564 ** then an and attempt is made to write an error message into 565 ** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that 566 ** error message. 567 */ 568 int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){ 569 int nErr = 0; /* Number of errors encountered */ 570 void *pEngine; /* The LEMON-generated LALR(1) parser */ 571 int n = 0; /* Length of the next token token */ 572 int tokenType; /* type of the next token */ 573 int lastTokenParsed = -1; /* type of the previous token */ 574 sqlite3 *db = pParse->db; /* The database connection */ 575 int mxSqlLen; /* Max length of an SQL string */ 576 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 577 yyParser sEngine; /* Space to hold the Lemon-generated Parser object */ 578 #endif 579 VVA_ONLY( u8 startedWithOom = db->mallocFailed ); 580 581 assert( zSql!=0 ); 582 mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH]; 583 if( db->nVdbeActive==0 ){ 584 AtomicStore(&db->u1.isInterrupted, 0); 585 } 586 pParse->rc = SQLITE_OK; 587 pParse->zTail = zSql; 588 assert( pzErrMsg!=0 ); 589 #ifdef SQLITE_DEBUG 590 if( db->flags & SQLITE_ParserTrace ){ 591 printf("parser: [[[%s]]]\n", zSql); 592 sqlite3ParserTrace(stdout, "parser: "); 593 }else{ 594 sqlite3ParserTrace(0, 0); 595 } 596 #endif 597 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 598 pEngine = &sEngine; 599 sqlite3ParserInit(pEngine, pParse); 600 #else 601 pEngine = sqlite3ParserAlloc(sqlite3Malloc, pParse); 602 if( pEngine==0 ){ 603 sqlite3OomFault(db); 604 return SQLITE_NOMEM_BKPT; 605 } 606 #endif 607 assert( pParse->pNewTable==0 ); 608 assert( pParse->pNewTrigger==0 ); 609 assert( pParse->nVar==0 ); 610 assert( pParse->pVList==0 ); 611 pParse->pParentParse = db->pParse; 612 db->pParse = pParse; 613 while( 1 ){ 614 n = sqlite3GetToken((u8*)zSql, &tokenType); 615 mxSqlLen -= n; 616 if( mxSqlLen<0 ){ 617 pParse->rc = SQLITE_TOOBIG; 618 break; 619 } 620 #ifndef SQLITE_OMIT_WINDOWFUNC 621 if( tokenType>=TK_WINDOW ){ 622 assert( tokenType==TK_SPACE || tokenType==TK_OVER || tokenType==TK_FILTER 623 || tokenType==TK_ILLEGAL || tokenType==TK_WINDOW 624 ); 625 #else 626 if( tokenType>=TK_SPACE ){ 627 assert( tokenType==TK_SPACE || tokenType==TK_ILLEGAL ); 628 #endif /* SQLITE_OMIT_WINDOWFUNC */ 629 if( AtomicLoad(&db->u1.isInterrupted) ){ 630 pParse->rc = SQLITE_INTERRUPT; 631 break; 632 } 633 if( tokenType==TK_SPACE ){ 634 zSql += n; 635 continue; 636 } 637 if( zSql[0]==0 ){ 638 /* Upon reaching the end of input, call the parser two more times 639 ** with tokens TK_SEMI and 0, in that order. */ 640 if( lastTokenParsed==TK_SEMI ){ 641 tokenType = 0; 642 }else if( lastTokenParsed==0 ){ 643 break; 644 }else{ 645 tokenType = TK_SEMI; 646 } 647 n = 0; 648 #ifndef SQLITE_OMIT_WINDOWFUNC 649 }else if( tokenType==TK_WINDOW ){ 650 assert( n==6 ); 651 tokenType = analyzeWindowKeyword((const u8*)&zSql[6]); 652 }else if( tokenType==TK_OVER ){ 653 assert( n==4 ); 654 tokenType = analyzeOverKeyword((const u8*)&zSql[4], lastTokenParsed); 655 }else if( tokenType==TK_FILTER ){ 656 assert( n==6 ); 657 tokenType = analyzeFilterKeyword((const u8*)&zSql[6], lastTokenParsed); 658 #endif /* SQLITE_OMIT_WINDOWFUNC */ 659 }else{ 660 sqlite3ErrorMsg(pParse, "unrecognized token: \"%.*s\"", n, zSql); 661 break; 662 } 663 } 664 pParse->sLastToken.z = zSql; 665 pParse->sLastToken.n = n; 666 sqlite3Parser(pEngine, tokenType, pParse->sLastToken); 667 lastTokenParsed = tokenType; 668 zSql += n; 669 assert( db->mallocFailed==0 || pParse->rc!=SQLITE_OK || startedWithOom ); 670 if( pParse->rc!=SQLITE_OK ) break; 671 } 672 assert( nErr==0 ); 673 #ifdef YYTRACKMAXSTACKDEPTH 674 sqlite3_mutex_enter(sqlite3MallocMutex()); 675 sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK, 676 sqlite3ParserStackPeak(pEngine) 677 ); 678 sqlite3_mutex_leave(sqlite3MallocMutex()); 679 #endif /* YYDEBUG */ 680 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 681 sqlite3ParserFinalize(pEngine); 682 #else 683 sqlite3ParserFree(pEngine, sqlite3_free); 684 #endif 685 if( db->mallocFailed ){ 686 pParse->rc = SQLITE_NOMEM_BKPT; 687 } 688 if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){ 689 pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc)); 690 } 691 assert( pzErrMsg!=0 ); 692 if( pParse->zErrMsg ){ 693 *pzErrMsg = pParse->zErrMsg; 694 sqlite3_log(pParse->rc, "%s in \"%s\"", 695 *pzErrMsg, pParse->zTail); 696 pParse->zErrMsg = 0; 697 nErr++; 698 } 699 pParse->zTail = zSql; 700 if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){ 701 sqlite3VdbeDelete(pParse->pVdbe); 702 pParse->pVdbe = 0; 703 } 704 #ifndef SQLITE_OMIT_SHARED_CACHE 705 if( pParse->nested==0 ){ 706 sqlite3DbFree(db, pParse->aTableLock); 707 pParse->aTableLock = 0; 708 pParse->nTableLock = 0; 709 } 710 #endif 711 #ifndef SQLITE_OMIT_VIRTUALTABLE 712 sqlite3_free(pParse->apVtabLock); 713 #endif 714 715 if( !IN_SPECIAL_PARSE ){ 716 /* If the pParse->declareVtab flag is set, do not delete any table 717 ** structure built up in pParse->pNewTable. The calling code (see vtab.c) 718 ** will take responsibility for freeing the Table structure. 719 */ 720 sqlite3DeleteTable(db, pParse->pNewTable); 721 } 722 if( !IN_RENAME_OBJECT ){ 723 sqlite3DeleteTrigger(db, pParse->pNewTrigger); 724 } 725 sqlite3DbFree(db, pParse->pVList); 726 db->pParse = pParse->pParentParse; 727 pParse->pParentParse = 0; 728 assert( nErr==0 || pParse->rc!=SQLITE_OK ); 729 return nErr; 730 } 731 732 733 #ifdef SQLITE_ENABLE_NORMALIZE 734 /* 735 ** Insert a single space character into pStr if the current string 736 ** ends with an identifier 737 */ 738 static void addSpaceSeparator(sqlite3_str *pStr){ 739 if( pStr->nChar && sqlite3IsIdChar(pStr->zText[pStr->nChar-1]) ){ 740 sqlite3_str_append(pStr, " ", 1); 741 } 742 } 743 744 /* 745 ** Compute a normalization of the SQL given by zSql[0..nSql-1]. Return 746 ** the normalization in space obtained from sqlite3DbMalloc(). Or return 747 ** NULL if anything goes wrong or if zSql is NULL. 748 */ 749 char *sqlite3Normalize( 750 Vdbe *pVdbe, /* VM being reprepared */ 751 const char *zSql /* The original SQL string */ 752 ){ 753 sqlite3 *db; /* The database connection */ 754 int i; /* Next unread byte of zSql[] */ 755 int n; /* length of current token */ 756 int tokenType; /* type of current token */ 757 int prevType = 0; /* Previous non-whitespace token */ 758 int nParen; /* Number of nested levels of parentheses */ 759 int iStartIN; /* Start of RHS of IN operator in z[] */ 760 int nParenAtIN; /* Value of nParent at start of RHS of IN operator */ 761 u32 j; /* Bytes of normalized SQL generated so far */ 762 sqlite3_str *pStr; /* The normalized SQL string under construction */ 763 764 db = sqlite3VdbeDb(pVdbe); 765 tokenType = -1; 766 nParen = iStartIN = nParenAtIN = 0; 767 pStr = sqlite3_str_new(db); 768 assert( pStr!=0 ); /* sqlite3_str_new() never returns NULL */ 769 for(i=0; zSql[i] && pStr->accError==0; i+=n){ 770 if( tokenType!=TK_SPACE ){ 771 prevType = tokenType; 772 } 773 n = sqlite3GetToken((unsigned char*)zSql+i, &tokenType); 774 if( NEVER(n<=0) ) break; 775 switch( tokenType ){ 776 case TK_SPACE: { 777 break; 778 } 779 case TK_NULL: { 780 if( prevType==TK_IS || prevType==TK_NOT ){ 781 sqlite3_str_append(pStr, " NULL", 5); 782 break; 783 } 784 /* Fall through */ 785 } 786 case TK_STRING: 787 case TK_INTEGER: 788 case TK_FLOAT: 789 case TK_VARIABLE: 790 case TK_BLOB: { 791 sqlite3_str_append(pStr, "?", 1); 792 break; 793 } 794 case TK_LP: { 795 nParen++; 796 if( prevType==TK_IN ){ 797 iStartIN = pStr->nChar; 798 nParenAtIN = nParen; 799 } 800 sqlite3_str_append(pStr, "(", 1); 801 break; 802 } 803 case TK_RP: { 804 if( iStartIN>0 && nParen==nParenAtIN ){ 805 assert( pStr->nChar>=(u32)iStartIN ); 806 pStr->nChar = iStartIN+1; 807 sqlite3_str_append(pStr, "?,?,?", 5); 808 iStartIN = 0; 809 } 810 nParen--; 811 sqlite3_str_append(pStr, ")", 1); 812 break; 813 } 814 case TK_ID: { 815 iStartIN = 0; 816 j = pStr->nChar; 817 if( sqlite3Isquote(zSql[i]) ){ 818 char *zId = sqlite3DbStrNDup(db, zSql+i, n); 819 int nId; 820 int eType = 0; 821 if( zId==0 ) break; 822 sqlite3Dequote(zId); 823 if( zSql[i]=='"' && sqlite3VdbeUsesDoubleQuotedString(pVdbe, zId) ){ 824 sqlite3_str_append(pStr, "?", 1); 825 sqlite3DbFree(db, zId); 826 break; 827 } 828 nId = sqlite3Strlen30(zId); 829 if( sqlite3GetToken((u8*)zId, &eType)==nId && eType==TK_ID ){ 830 addSpaceSeparator(pStr); 831 sqlite3_str_append(pStr, zId, nId); 832 }else{ 833 sqlite3_str_appendf(pStr, "\"%w\"", zId); 834 } 835 sqlite3DbFree(db, zId); 836 }else{ 837 addSpaceSeparator(pStr); 838 sqlite3_str_append(pStr, zSql+i, n); 839 } 840 while( j<pStr->nChar ){ 841 pStr->zText[j] = sqlite3Tolower(pStr->zText[j]); 842 j++; 843 } 844 break; 845 } 846 case TK_SELECT: { 847 iStartIN = 0; 848 /* fall through */ 849 } 850 default: { 851 if( sqlite3IsIdChar(zSql[i]) ) addSpaceSeparator(pStr); 852 j = pStr->nChar; 853 sqlite3_str_append(pStr, zSql+i, n); 854 while( j<pStr->nChar ){ 855 pStr->zText[j] = sqlite3Toupper(pStr->zText[j]); 856 j++; 857 } 858 break; 859 } 860 } 861 } 862 if( tokenType!=TK_SEMI ) sqlite3_str_append(pStr, ";", 1); 863 return sqlite3_str_finish(pStr); 864 } 865 #endif /* SQLITE_ENABLE_NORMALIZE */ 866