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 */ 188 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS 189 int sqlite3IsIdChar(u8 c){ return IdChar(c); } 190 #endif 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 } 428 case CC_DIGIT: { 429 testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' ); 430 testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' ); 431 testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' ); 432 testcase( z[0]=='9' ); 433 *tokenType = TK_INTEGER; 434 #ifndef SQLITE_OMIT_HEX_INTEGER 435 if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){ 436 for(i=3; sqlite3Isxdigit(z[i]); i++){} 437 return i; 438 } 439 #endif 440 for(i=0; sqlite3Isdigit(z[i]); i++){} 441 #ifndef SQLITE_OMIT_FLOATING_POINT 442 if( z[i]=='.' ){ 443 i++; 444 while( sqlite3Isdigit(z[i]) ){ i++; } 445 *tokenType = TK_FLOAT; 446 } 447 if( (z[i]=='e' || z[i]=='E') && 448 ( sqlite3Isdigit(z[i+1]) 449 || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2])) 450 ) 451 ){ 452 i += 2; 453 while( sqlite3Isdigit(z[i]) ){ i++; } 454 *tokenType = TK_FLOAT; 455 } 456 #endif 457 while( IdChar(z[i]) ){ 458 *tokenType = TK_ILLEGAL; 459 i++; 460 } 461 return i; 462 } 463 case CC_QUOTE2: { 464 for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){} 465 *tokenType = c==']' ? TK_ID : TK_ILLEGAL; 466 return i; 467 } 468 case CC_VARNUM: { 469 *tokenType = TK_VARIABLE; 470 for(i=1; sqlite3Isdigit(z[i]); i++){} 471 return i; 472 } 473 case CC_DOLLAR: 474 case CC_VARALPHA: { 475 int n = 0; 476 testcase( z[0]=='$' ); testcase( z[0]=='@' ); 477 testcase( z[0]==':' ); testcase( z[0]=='#' ); 478 *tokenType = TK_VARIABLE; 479 for(i=1; (c=z[i])!=0; i++){ 480 if( IdChar(c) ){ 481 n++; 482 #ifndef SQLITE_OMIT_TCL_VARIABLE 483 }else if( c=='(' && n>0 ){ 484 do{ 485 i++; 486 }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' ); 487 if( c==')' ){ 488 i++; 489 }else{ 490 *tokenType = TK_ILLEGAL; 491 } 492 break; 493 }else if( c==':' && z[i+1]==':' ){ 494 i++; 495 #endif 496 }else{ 497 break; 498 } 499 } 500 if( n==0 ) *tokenType = TK_ILLEGAL; 501 return i; 502 } 503 case CC_KYWD: { 504 for(i=1; aiClass[z[i]]<=CC_KYWD; i++){} 505 if( IdChar(z[i]) ){ 506 /* This token started out using characters that can appear in keywords, 507 ** but z[i] is a character not allowed within keywords, so this must 508 ** be an identifier instead */ 509 i++; 510 break; 511 } 512 *tokenType = TK_ID; 513 return keywordCode((char*)z, i, tokenType); 514 } 515 case CC_X: { 516 #ifndef SQLITE_OMIT_BLOB_LITERAL 517 testcase( z[0]=='x' ); testcase( z[0]=='X' ); 518 if( z[1]=='\'' ){ 519 *tokenType = TK_BLOB; 520 for(i=2; sqlite3Isxdigit(z[i]); i++){} 521 if( z[i]!='\'' || i%2 ){ 522 *tokenType = TK_ILLEGAL; 523 while( z[i] && z[i]!='\'' ){ i++; } 524 } 525 if( z[i] ) i++; 526 return i; 527 } 528 #endif 529 /* If it is not a BLOB literal, then it must be an ID, since no 530 ** SQL keywords start with the letter 'x'. Fall through */ 531 } 532 case CC_ID: { 533 i = 1; 534 break; 535 } 536 case CC_NUL: { 537 *tokenType = TK_ILLEGAL; 538 return 0; 539 } 540 default: { 541 *tokenType = TK_ILLEGAL; 542 return 1; 543 } 544 } 545 while( IdChar(z[i]) ){ i++; } 546 *tokenType = TK_ID; 547 return i; 548 } 549 550 /* 551 ** Run the parser on the given SQL string. The parser structure is 552 ** passed in. An SQLITE_ status code is returned. If an error occurs 553 ** then an and attempt is made to write an error message into 554 ** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that 555 ** error message. 556 */ 557 int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){ 558 int nErr = 0; /* Number of errors encountered */ 559 void *pEngine; /* The LEMON-generated LALR(1) parser */ 560 int n = 0; /* Length of the next token token */ 561 int tokenType; /* type of the next token */ 562 int lastTokenParsed = -1; /* type of the previous token */ 563 sqlite3 *db = pParse->db; /* The database connection */ 564 int mxSqlLen; /* Max length of an SQL string */ 565 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 566 yyParser sEngine; /* Space to hold the Lemon-generated Parser object */ 567 #endif 568 569 assert( zSql!=0 ); 570 mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH]; 571 if( db->nVdbeActive==0 ){ 572 db->u1.isInterrupted = 0; 573 } 574 pParse->rc = SQLITE_OK; 575 pParse->zTail = zSql; 576 assert( pzErrMsg!=0 ); 577 /* sqlite3ParserTrace(stdout, "parser: "); */ 578 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 579 pEngine = &sEngine; 580 sqlite3ParserInit(pEngine, pParse); 581 #else 582 pEngine = sqlite3ParserAlloc(sqlite3Malloc, pParse); 583 if( pEngine==0 ){ 584 sqlite3OomFault(db); 585 return SQLITE_NOMEM_BKPT; 586 } 587 #endif 588 assert( pParse->pNewTable==0 ); 589 assert( pParse->pNewTrigger==0 ); 590 assert( pParse->nVar==0 ); 591 assert( pParse->pVList==0 ); 592 while( 1 ){ 593 n = sqlite3GetToken((u8*)zSql, &tokenType); 594 mxSqlLen -= n; 595 if( mxSqlLen<0 ){ 596 pParse->rc = SQLITE_TOOBIG; 597 break; 598 } 599 #ifndef SQLITE_OMIT_WINDOWFUNC 600 if( tokenType>=TK_WINDOW ){ 601 assert( tokenType==TK_SPACE || tokenType==TK_OVER || tokenType==TK_FILTER 602 || tokenType==TK_ILLEGAL || tokenType==TK_WINDOW 603 ); 604 #else 605 if( tokenType>=TK_SPACE ){ 606 assert( tokenType==TK_SPACE || tokenType==TK_ILLEGAL ); 607 #endif /* SQLITE_OMIT_WINDOWFUNC */ 608 if( db->u1.isInterrupted ){ 609 pParse->rc = SQLITE_INTERRUPT; 610 break; 611 } 612 if( tokenType==TK_SPACE ){ 613 zSql += n; 614 continue; 615 } 616 if( zSql[0]==0 ){ 617 /* Upon reaching the end of input, call the parser two more times 618 ** with tokens TK_SEMI and 0, in that order. */ 619 if( lastTokenParsed==TK_SEMI ){ 620 tokenType = 0; 621 }else if( lastTokenParsed==0 ){ 622 break; 623 }else{ 624 tokenType = TK_SEMI; 625 } 626 n = 0; 627 #ifndef SQLITE_OMIT_WINDOWFUNC 628 }else if( tokenType==TK_WINDOW ){ 629 assert( n==6 ); 630 tokenType = analyzeWindowKeyword((const u8*)&zSql[6]); 631 }else if( tokenType==TK_OVER ){ 632 assert( n==4 ); 633 tokenType = analyzeOverKeyword((const u8*)&zSql[4], lastTokenParsed); 634 }else if( tokenType==TK_FILTER ){ 635 assert( n==6 ); 636 tokenType = analyzeFilterKeyword((const u8*)&zSql[6], lastTokenParsed); 637 #endif /* SQLITE_OMIT_WINDOWFUNC */ 638 }else{ 639 sqlite3ErrorMsg(pParse, "unrecognized token: \"%.*s\"", n, zSql); 640 break; 641 } 642 } 643 pParse->sLastToken.z = zSql; 644 pParse->sLastToken.n = n; 645 sqlite3Parser(pEngine, tokenType, pParse->sLastToken); 646 lastTokenParsed = tokenType; 647 zSql += n; 648 if( pParse->rc!=SQLITE_OK || db->mallocFailed ) break; 649 } 650 assert( nErr==0 ); 651 #ifdef YYTRACKMAXSTACKDEPTH 652 sqlite3_mutex_enter(sqlite3MallocMutex()); 653 sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK, 654 sqlite3ParserStackPeak(pEngine) 655 ); 656 sqlite3_mutex_leave(sqlite3MallocMutex()); 657 #endif /* YYDEBUG */ 658 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK 659 sqlite3ParserFinalize(pEngine); 660 #else 661 sqlite3ParserFree(pEngine, sqlite3_free); 662 #endif 663 if( db->mallocFailed ){ 664 pParse->rc = SQLITE_NOMEM_BKPT; 665 } 666 if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){ 667 pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc)); 668 } 669 assert( pzErrMsg!=0 ); 670 if( pParse->zErrMsg ){ 671 *pzErrMsg = pParse->zErrMsg; 672 sqlite3_log(pParse->rc, "%s in \"%s\"", 673 *pzErrMsg, pParse->zTail); 674 pParse->zErrMsg = 0; 675 nErr++; 676 } 677 pParse->zTail = zSql; 678 if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){ 679 sqlite3VdbeDelete(pParse->pVdbe); 680 pParse->pVdbe = 0; 681 } 682 #ifndef SQLITE_OMIT_SHARED_CACHE 683 if( pParse->nested==0 ){ 684 sqlite3DbFree(db, pParse->aTableLock); 685 pParse->aTableLock = 0; 686 pParse->nTableLock = 0; 687 } 688 #endif 689 #ifndef SQLITE_OMIT_VIRTUALTABLE 690 sqlite3_free(pParse->apVtabLock); 691 #endif 692 693 if( !IN_DECLARE_VTAB ){ 694 /* If the pParse->declareVtab flag is set, do not delete any table 695 ** structure built up in pParse->pNewTable. The calling code (see vtab.c) 696 ** will take responsibility for freeing the Table structure. 697 */ 698 sqlite3DeleteTable(db, pParse->pNewTable); 699 } 700 701 if( pParse->pWithToFree ) sqlite3WithDelete(db, pParse->pWithToFree); 702 sqlite3DeleteTrigger(db, pParse->pNewTrigger); 703 sqlite3DbFree(db, pParse->pVList); 704 while( pParse->pAinc ){ 705 AutoincInfo *p = pParse->pAinc; 706 pParse->pAinc = p->pNext; 707 sqlite3DbFreeNN(db, p); 708 } 709 while( pParse->pZombieTab ){ 710 Table *p = pParse->pZombieTab; 711 pParse->pZombieTab = p->pNextZombie; 712 sqlite3DeleteTable(db, p); 713 } 714 assert( nErr==0 || pParse->rc!=SQLITE_OK ); 715 return nErr; 716 } 717