000001 /*
000002 ** 2001 September 15
000003 **
000004 ** The author disclaims copyright to this source code. In place of
000005 ** a legal notice, here is a blessing:
000006 **
000007 ** May you do good and not evil.
000008 ** May you find forgiveness for yourself and forgive others.
000009 ** May you share freely, never taking more than you give.
000010 **
000011 *************************************************************************
000012 ** An tokenizer for SQL
000013 **
000014 ** This file contains C code that splits an SQL input string up into
000015 ** individual tokens and sends those tokens one-by-one over to the
000016 ** parser for analysis.
000017 */
000018 #include "sqliteInt.h"
000019 #include <stdlib.h>
000020
000021 /* Character classes for tokenizing
000022 **
000023 ** In the sqlite3GetToken() function, a switch() on aiClass[c] is implemented
000024 ** using a lookup table, whereas a switch() directly on c uses a binary search.
000025 ** The lookup table is much faster. To maximize speed, and to ensure that
000026 ** a lookup table is used, all of the classes need to be small integers and
000027 ** all of them need to be used within the switch.
000028 */
000029 #define CC_X 0 /* The letter 'x', or start of BLOB literal */
000030 #define CC_KYWD0 1 /* First letter of a keyword */
000031 #define CC_KYWD 2 /* Alphabetics or '_'. Usable in a keyword */
000032 #define CC_DIGIT 3 /* Digits */
000033 #define CC_DOLLAR 4 /* '$' */
000034 #define CC_VARALPHA 5 /* '@', '#', ':'. Alphabetic SQL variables */
000035 #define CC_VARNUM 6 /* '?'. Numeric SQL variables */
000036 #define CC_SPACE 7 /* Space characters */
000037 #define CC_QUOTE 8 /* '"', '\'', or '`'. String literals, quoted ids */
000038 #define CC_QUOTE2 9 /* '['. [...] style quoted ids */
000039 #define CC_PIPE 10 /* '|'. Bitwise OR or concatenate */
000040 #define CC_MINUS 11 /* '-'. Minus or SQL-style comment */
000041 #define CC_LT 12 /* '<'. Part of < or <= or <> */
000042 #define CC_GT 13 /* '>'. Part of > or >= */
000043 #define CC_EQ 14 /* '='. Part of = or == */
000044 #define CC_BANG 15 /* '!'. Part of != */
000045 #define CC_SLASH 16 /* '/'. / or c-style comment */
000046 #define CC_LP 17 /* '(' */
000047 #define CC_RP 18 /* ')' */
000048 #define CC_SEMI 19 /* ';' */
000049 #define CC_PLUS 20 /* '+' */
000050 #define CC_STAR 21 /* '*' */
000051 #define CC_PERCENT 22 /* '%' */
000052 #define CC_COMMA 23 /* ',' */
000053 #define CC_AND 24 /* '&' */
000054 #define CC_TILDA 25 /* '~' */
000055 #define CC_DOT 26 /* '.' */
000056 #define CC_ID 27 /* unicode characters usable in IDs */
000057 #define CC_ILLEGAL 28 /* Illegal character */
000058 #define CC_NUL 29 /* 0x00 */
000059 #define CC_BOM 30 /* First byte of UTF8 BOM: 0xEF 0xBB 0xBF */
000060
000061 static const unsigned char aiClass[] = {
000062 #ifdef SQLITE_ASCII
000063 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
000064 /* 0x */ 29, 28, 28, 28, 28, 28, 28, 28, 28, 7, 7, 28, 7, 7, 28, 28,
000065 /* 1x */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
000066 /* 2x */ 7, 15, 8, 5, 4, 22, 24, 8, 17, 18, 21, 20, 23, 11, 26, 16,
000067 /* 3x */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 19, 12, 14, 13, 6,
000068 /* 4x */ 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
000069 /* 5x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 2, 2, 9, 28, 28, 28, 2,
000070 /* 6x */ 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
000071 /* 7x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 2, 2, 28, 10, 28, 25, 28,
000072 /* 8x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
000073 /* 9x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
000074 /* Ax */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
000075 /* Bx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
000076 /* Cx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
000077 /* Dx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
000078 /* Ex */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 30,
000079 /* Fx */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27
000080 #endif
000081 #ifdef SQLITE_EBCDIC
000082 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
000083 /* 0x */ 29, 28, 28, 28, 28, 7, 28, 28, 28, 28, 28, 28, 7, 7, 28, 28,
000084 /* 1x */ 28, 28, 28, 28, 28, 7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
000085 /* 2x */ 28, 28, 28, 28, 28, 7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
000086 /* 3x */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
000087 /* 4x */ 7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 26, 12, 17, 20, 10,
000088 /* 5x */ 24, 28, 28, 28, 28, 28, 28, 28, 28, 28, 15, 4, 21, 18, 19, 28,
000089 /* 6x */ 11, 16, 28, 28, 28, 28, 28, 28, 28, 28, 28, 23, 22, 2, 13, 6,
000090 /* 7x */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 8, 5, 5, 5, 8, 14, 8,
000091 /* 8x */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28,
000092 /* 9x */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28,
000093 /* Ax */ 28, 25, 1, 1, 1, 1, 1, 0, 2, 2, 28, 28, 28, 28, 28, 28,
000094 /* Bx */ 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 9, 28, 28, 28, 28, 28,
000095 /* Cx */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28,
000096 /* Dx */ 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 28, 28, 28, 28, 28,
000097 /* Ex */ 28, 28, 1, 1, 1, 1, 1, 0, 2, 2, 28, 28, 28, 28, 28, 28,
000098 /* Fx */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 28, 28, 28, 28, 28, 28,
000099 #endif
000100 };
000101
000102 /*
000103 ** The charMap() macro maps alphabetic characters (only) into their
000104 ** lower-case ASCII equivalent. On ASCII machines, this is just
000105 ** an upper-to-lower case map. On EBCDIC machines we also need
000106 ** to adjust the encoding. The mapping is only valid for alphabetics
000107 ** which are the only characters for which this feature is used.
000108 **
000109 ** Used by keywordhash.h
000110 */
000111 #ifdef SQLITE_ASCII
000112 # define charMap(X) sqlite3UpperToLower[(unsigned char)X]
000113 #endif
000114 #ifdef SQLITE_EBCDIC
000115 # define charMap(X) ebcdicToAscii[(unsigned char)X]
000116 const unsigned char ebcdicToAscii[] = {
000117 /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
000118 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
000119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
000120 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */
000121 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3x */
000122 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4x */
000123 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5x */
000124 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 0, 0, /* 6x */
000125 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7x */
000126 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* 8x */
000127 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* 9x */
000128 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ax */
000129 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
000130 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* Cx */
000131 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* Dx */
000132 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ex */
000133 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Fx */
000134 };
000135 #endif
000136
000137 /*
000138 ** The sqlite3KeywordCode function looks up an identifier to determine if
000139 ** it is a keyword. If it is a keyword, the token code of that keyword is
000140 ** returned. If the input is not a keyword, TK_ID is returned.
000141 **
000142 ** The implementation of this routine was generated by a program,
000143 ** mkkeywordhash.c, located in the tool subdirectory of the distribution.
000144 ** The output of the mkkeywordhash.c program is written into a file
000145 ** named keywordhash.h and then included into this source file by
000146 ** the #include below.
000147 */
000148 #include "keywordhash.h"
000149
000150
000151 /*
000152 ** If X is a character that can be used in an identifier then
000153 ** IdChar(X) will be true. Otherwise it is false.
000154 **
000155 ** For ASCII, any character with the high-order bit set is
000156 ** allowed in an identifier. For 7-bit characters,
000157 ** sqlite3IsIdChar[X] must be 1.
000158 **
000159 ** For EBCDIC, the rules are more complex but have the same
000160 ** end result.
000161 **
000162 ** Ticket #1066. the SQL standard does not allow '$' in the
000163 ** middle of identifiers. But many SQL implementations do.
000164 ** SQLite will allow '$' in identifiers for compatibility.
000165 ** But the feature is undocumented.
000166 */
000167 #ifdef SQLITE_ASCII
000168 #define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
000169 #endif
000170 #ifdef SQLITE_EBCDIC
000171 const char sqlite3IsEbcdicIdChar[] = {
000172 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
000173 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 4x */
000174 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, /* 5x */
000175 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, /* 6x */
000176 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, /* 7x */
000177 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, /* 8x */
000178 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, /* 9x */
000179 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, /* Ax */
000180 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
000181 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Cx */
000182 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Dx */
000183 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Ex */
000184 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, /* Fx */
000185 };
000186 #define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
000187 #endif
000188
000189 /* Make the IdChar function accessible from ctime.c and alter.c */
000190 int sqlite3IsIdChar(u8 c){ return IdChar(c); }
000191
000192 #ifndef SQLITE_OMIT_WINDOWFUNC
000193 /*
000194 ** Return the id of the next token in string (*pz). Before returning, set
000195 ** (*pz) to point to the byte following the parsed token.
000196 */
000197 static int getToken(const unsigned char **pz){
000198 const unsigned char *z = *pz;
000199 int t; /* Token type to return */
000200 do {
000201 z += sqlite3GetToken(z, &t);
000202 }while( t==TK_SPACE );
000203 if( t==TK_ID
000204 || t==TK_STRING
000205 || t==TK_JOIN_KW
000206 || t==TK_WINDOW
000207 || t==TK_OVER
000208 || sqlite3ParserFallback(t)==TK_ID
000209 ){
000210 t = TK_ID;
000211 }
000212 *pz = z;
000213 return t;
000214 }
000215
000216 /*
000217 ** The following three functions are called immediately after the tokenizer
000218 ** reads the keywords WINDOW, OVER and FILTER, respectively, to determine
000219 ** whether the token should be treated as a keyword or an SQL identifier.
000220 ** This cannot be handled by the usual lemon %fallback method, due to
000221 ** the ambiguity in some constructions. e.g.
000222 **
000223 ** SELECT sum(x) OVER ...
000224 **
000225 ** In the above, "OVER" might be a keyword, or it might be an alias for the
000226 ** sum(x) expression. If a "%fallback ID OVER" directive were added to
000227 ** grammar, then SQLite would always treat "OVER" as an alias, making it
000228 ** impossible to call a window-function without a FILTER clause.
000229 **
000230 ** WINDOW is treated as a keyword if:
000231 **
000232 ** * the following token is an identifier, or a keyword that can fallback
000233 ** to being an identifier, and
000234 ** * the token after than one is TK_AS.
000235 **
000236 ** OVER is a keyword if:
000237 **
000238 ** * the previous token was TK_RP, and
000239 ** * the next token is either TK_LP or an identifier.
000240 **
000241 ** FILTER is a keyword if:
000242 **
000243 ** * the previous token was TK_RP, and
000244 ** * the next token is TK_LP.
000245 */
000246 static int analyzeWindowKeyword(const unsigned char *z){
000247 int t;
000248 t = getToken(&z);
000249 if( t!=TK_ID ) return TK_ID;
000250 t = getToken(&z);
000251 if( t!=TK_AS ) return TK_ID;
000252 return TK_WINDOW;
000253 }
000254 static int analyzeOverKeyword(const unsigned char *z, int lastToken){
000255 if( lastToken==TK_RP ){
000256 int t = getToken(&z);
000257 if( t==TK_LP || t==TK_ID ) return TK_OVER;
000258 }
000259 return TK_ID;
000260 }
000261 static int analyzeFilterKeyword(const unsigned char *z, int lastToken){
000262 if( lastToken==TK_RP && getToken(&z)==TK_LP ){
000263 return TK_FILTER;
000264 }
000265 return TK_ID;
000266 }
000267 #endif /* SQLITE_OMIT_WINDOWFUNC */
000268
000269 /*
000270 ** Return the length (in bytes) of the token that begins at z[0].
000271 ** Store the token type in *tokenType before returning.
000272 */
000273 int sqlite3GetToken(const unsigned char *z, int *tokenType){
000274 int i, c;
000275 switch( aiClass[*z] ){ /* Switch on the character-class of the first byte
000276 ** of the token. See the comment on the CC_ defines
000277 ** above. */
000278 case CC_SPACE: {
000279 testcase( z[0]==' ' );
000280 testcase( z[0]=='\t' );
000281 testcase( z[0]=='\n' );
000282 testcase( z[0]=='\f' );
000283 testcase( z[0]=='\r' );
000284 for(i=1; sqlite3Isspace(z[i]); i++){}
000285 *tokenType = TK_SPACE;
000286 return i;
000287 }
000288 case CC_MINUS: {
000289 if( z[1]=='-' ){
000290 for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
000291 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */
000292 return i;
000293 }else if( z[1]=='>' ){
000294 *tokenType = TK_PTR;
000295 return 2 + (z[2]=='>');
000296 }
000297 *tokenType = TK_MINUS;
000298 return 1;
000299 }
000300 case CC_LP: {
000301 *tokenType = TK_LP;
000302 return 1;
000303 }
000304 case CC_RP: {
000305 *tokenType = TK_RP;
000306 return 1;
000307 }
000308 case CC_SEMI: {
000309 *tokenType = TK_SEMI;
000310 return 1;
000311 }
000312 case CC_PLUS: {
000313 *tokenType = TK_PLUS;
000314 return 1;
000315 }
000316 case CC_STAR: {
000317 *tokenType = TK_STAR;
000318 return 1;
000319 }
000320 case CC_SLASH: {
000321 if( z[1]!='*' || z[2]==0 ){
000322 *tokenType = TK_SLASH;
000323 return 1;
000324 }
000325 for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
000326 if( c ) i++;
000327 *tokenType = TK_SPACE; /* IMP: R-22934-25134 */
000328 return i;
000329 }
000330 case CC_PERCENT: {
000331 *tokenType = TK_REM;
000332 return 1;
000333 }
000334 case CC_EQ: {
000335 *tokenType = TK_EQ;
000336 return 1 + (z[1]=='=');
000337 }
000338 case CC_LT: {
000339 if( (c=z[1])=='=' ){
000340 *tokenType = TK_LE;
000341 return 2;
000342 }else if( c=='>' ){
000343 *tokenType = TK_NE;
000344 return 2;
000345 }else if( c=='<' ){
000346 *tokenType = TK_LSHIFT;
000347 return 2;
000348 }else{
000349 *tokenType = TK_LT;
000350 return 1;
000351 }
000352 }
000353 case CC_GT: {
000354 if( (c=z[1])=='=' ){
000355 *tokenType = TK_GE;
000356 return 2;
000357 }else if( c=='>' ){
000358 *tokenType = TK_RSHIFT;
000359 return 2;
000360 }else{
000361 *tokenType = TK_GT;
000362 return 1;
000363 }
000364 }
000365 case CC_BANG: {
000366 if( z[1]!='=' ){
000367 *tokenType = TK_ILLEGAL;
000368 return 1;
000369 }else{
000370 *tokenType = TK_NE;
000371 return 2;
000372 }
000373 }
000374 case CC_PIPE: {
000375 if( z[1]!='|' ){
000376 *tokenType = TK_BITOR;
000377 return 1;
000378 }else{
000379 *tokenType = TK_CONCAT;
000380 return 2;
000381 }
000382 }
000383 case CC_COMMA: {
000384 *tokenType = TK_COMMA;
000385 return 1;
000386 }
000387 case CC_AND: {
000388 *tokenType = TK_BITAND;
000389 return 1;
000390 }
000391 case CC_TILDA: {
000392 *tokenType = TK_BITNOT;
000393 return 1;
000394 }
000395 case CC_QUOTE: {
000396 int delim = z[0];
000397 testcase( delim=='`' );
000398 testcase( delim=='\'' );
000399 testcase( delim=='"' );
000400 for(i=1; (c=z[i])!=0; i++){
000401 if( c==delim ){
000402 if( z[i+1]==delim ){
000403 i++;
000404 }else{
000405 break;
000406 }
000407 }
000408 }
000409 if( c=='\'' ){
000410 *tokenType = TK_STRING;
000411 return i+1;
000412 }else if( c!=0 ){
000413 *tokenType = TK_ID;
000414 return i+1;
000415 }else{
000416 *tokenType = TK_ILLEGAL;
000417 return i;
000418 }
000419 }
000420 case CC_DOT: {
000421 #ifndef SQLITE_OMIT_FLOATING_POINT
000422 if( !sqlite3Isdigit(z[1]) )
000423 #endif
000424 {
000425 *tokenType = TK_DOT;
000426 return 1;
000427 }
000428 /* If the next character is a digit, this is a floating point
000429 ** number that begins with ".". Fall thru into the next case */
000430 /* no break */ deliberate_fall_through
000431 }
000432 case CC_DIGIT: {
000433 testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' );
000434 testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' );
000435 testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' );
000436 testcase( z[0]=='9' ); testcase( z[0]=='.' );
000437 *tokenType = TK_INTEGER;
000438 #ifndef SQLITE_OMIT_HEX_INTEGER
000439 if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){
000440 for(i=3; sqlite3Isxdigit(z[i]); i++){}
000441 return i;
000442 }
000443 #endif
000444 for(i=0; sqlite3Isdigit(z[i]); i++){}
000445 #ifndef SQLITE_OMIT_FLOATING_POINT
000446 if( z[i]=='.' ){
000447 i++;
000448 while( sqlite3Isdigit(z[i]) ){ i++; }
000449 *tokenType = TK_FLOAT;
000450 }
000451 if( (z[i]=='e' || z[i]=='E') &&
000452 ( sqlite3Isdigit(z[i+1])
000453 || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2]))
000454 )
000455 ){
000456 i += 2;
000457 while( sqlite3Isdigit(z[i]) ){ i++; }
000458 *tokenType = TK_FLOAT;
000459 }
000460 #endif
000461 while( IdChar(z[i]) ){
000462 *tokenType = TK_ILLEGAL;
000463 i++;
000464 }
000465 return i;
000466 }
000467 case CC_QUOTE2: {
000468 for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
000469 *tokenType = c==']' ? TK_ID : TK_ILLEGAL;
000470 return i;
000471 }
000472 case CC_VARNUM: {
000473 *tokenType = TK_VARIABLE;
000474 for(i=1; sqlite3Isdigit(z[i]); i++){}
000475 return i;
000476 }
000477 case CC_DOLLAR:
000478 case CC_VARALPHA: {
000479 int n = 0;
000480 testcase( z[0]=='$' ); testcase( z[0]=='@' );
000481 testcase( z[0]==':' ); testcase( z[0]=='#' );
000482 *tokenType = TK_VARIABLE;
000483 for(i=1; (c=z[i])!=0; i++){
000484 if( IdChar(c) ){
000485 n++;
000486 #ifndef SQLITE_OMIT_TCL_VARIABLE
000487 }else if( c=='(' && n>0 ){
000488 do{
000489 i++;
000490 }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' );
000491 if( c==')' ){
000492 i++;
000493 }else{
000494 *tokenType = TK_ILLEGAL;
000495 }
000496 break;
000497 }else if( c==':' && z[i+1]==':' ){
000498 i++;
000499 #endif
000500 }else{
000501 break;
000502 }
000503 }
000504 if( n==0 ) *tokenType = TK_ILLEGAL;
000505 return i;
000506 }
000507 case CC_KYWD0: {
000508 if( aiClass[z[1]]>CC_KYWD ){ i = 1; break; }
000509 for(i=2; aiClass[z[i]]<=CC_KYWD; i++){}
000510 if( IdChar(z[i]) ){
000511 /* This token started out using characters that can appear in keywords,
000512 ** but z[i] is a character not allowed within keywords, so this must
000513 ** be an identifier instead */
000514 i++;
000515 break;
000516 }
000517 *tokenType = TK_ID;
000518 return keywordCode((char*)z, i, tokenType);
000519 }
000520 case CC_X: {
000521 #ifndef SQLITE_OMIT_BLOB_LITERAL
000522 testcase( z[0]=='x' ); testcase( z[0]=='X' );
000523 if( z[1]=='\'' ){
000524 *tokenType = TK_BLOB;
000525 for(i=2; sqlite3Isxdigit(z[i]); i++){}
000526 if( z[i]!='\'' || i%2 ){
000527 *tokenType = TK_ILLEGAL;
000528 while( z[i] && z[i]!='\'' ){ i++; }
000529 }
000530 if( z[i] ) i++;
000531 return i;
000532 }
000533 #endif
000534 /* If it is not a BLOB literal, then it must be an ID, since no
000535 ** SQL keywords start with the letter 'x'. Fall through */
000536 /* no break */ deliberate_fall_through
000537 }
000538 case CC_KYWD:
000539 case CC_ID: {
000540 i = 1;
000541 break;
000542 }
000543 case CC_BOM: {
000544 if( z[1]==0xbb && z[2]==0xbf ){
000545 *tokenType = TK_SPACE;
000546 return 3;
000547 }
000548 i = 1;
000549 break;
000550 }
000551 case CC_NUL: {
000552 *tokenType = TK_ILLEGAL;
000553 return 0;
000554 }
000555 default: {
000556 *tokenType = TK_ILLEGAL;
000557 return 1;
000558 }
000559 }
000560 while( IdChar(z[i]) ){ i++; }
000561 *tokenType = TK_ID;
000562 return i;
000563 }
000564
000565 /*
000566 ** Run the parser on the given SQL string.
000567 */
000568 int sqlite3RunParser(Parse *pParse, const char *zSql){
000569 int nErr = 0; /* Number of errors encountered */
000570 void *pEngine; /* The LEMON-generated LALR(1) parser */
000571 int n = 0; /* Length of the next token token */
000572 int tokenType; /* type of the next token */
000573 int lastTokenParsed = -1; /* type of the previous token */
000574 sqlite3 *db = pParse->db; /* The database connection */
000575 int mxSqlLen; /* Max length of an SQL string */
000576 Parse *pParentParse = 0; /* Outer parse context, if any */
000577 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK
000578 yyParser sEngine; /* Space to hold the Lemon-generated Parser object */
000579 #endif
000580 VVA_ONLY( u8 startedWithOom = db->mallocFailed );
000581
000582 assert( zSql!=0 );
000583 mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
000584 if( db->nVdbeActive==0 ){
000585 AtomicStore(&db->u1.isInterrupted, 0);
000586 }
000587 pParse->rc = SQLITE_OK;
000588 pParse->zTail = zSql;
000589 #ifdef SQLITE_DEBUG
000590 if( db->flags & SQLITE_ParserTrace ){
000591 printf("parser: [[[%s]]]\n", zSql);
000592 sqlite3ParserTrace(stdout, "parser: ");
000593 }else{
000594 sqlite3ParserTrace(0, 0);
000595 }
000596 #endif
000597 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK
000598 pEngine = &sEngine;
000599 sqlite3ParserInit(pEngine, pParse);
000600 #else
000601 pEngine = sqlite3ParserAlloc(sqlite3Malloc, pParse);
000602 if( pEngine==0 ){
000603 sqlite3OomFault(db);
000604 return SQLITE_NOMEM_BKPT;
000605 }
000606 #endif
000607 assert( pParse->pNewTable==0 );
000608 assert( pParse->pNewTrigger==0 );
000609 assert( pParse->nVar==0 );
000610 assert( pParse->pVList==0 );
000611 pParentParse = db->pParse;
000612 db->pParse = pParse;
000613 while( 1 ){
000614 n = sqlite3GetToken((u8*)zSql, &tokenType);
000615 mxSqlLen -= n;
000616 if( mxSqlLen<0 ){
000617 pParse->rc = SQLITE_TOOBIG;
000618 pParse->nErr++;
000619 break;
000620 }
000621 #ifndef SQLITE_OMIT_WINDOWFUNC
000622 if( tokenType>=TK_WINDOW ){
000623 assert( tokenType==TK_SPACE || tokenType==TK_OVER || tokenType==TK_FILTER
000624 || tokenType==TK_ILLEGAL || tokenType==TK_WINDOW
000625 );
000626 #else
000627 if( tokenType>=TK_SPACE ){
000628 assert( tokenType==TK_SPACE || tokenType==TK_ILLEGAL );
000629 #endif /* SQLITE_OMIT_WINDOWFUNC */
000630 if( AtomicLoad(&db->u1.isInterrupted) ){
000631 pParse->rc = SQLITE_INTERRUPT;
000632 pParse->nErr++;
000633 break;
000634 }
000635 if( tokenType==TK_SPACE ){
000636 zSql += n;
000637 continue;
000638 }
000639 if( zSql[0]==0 ){
000640 /* Upon reaching the end of input, call the parser two more times
000641 ** with tokens TK_SEMI and 0, in that order. */
000642 if( lastTokenParsed==TK_SEMI ){
000643 tokenType = 0;
000644 }else if( lastTokenParsed==0 ){
000645 break;
000646 }else{
000647 tokenType = TK_SEMI;
000648 }
000649 n = 0;
000650 #ifndef SQLITE_OMIT_WINDOWFUNC
000651 }else if( tokenType==TK_WINDOW ){
000652 assert( n==6 );
000653 tokenType = analyzeWindowKeyword((const u8*)&zSql[6]);
000654 }else if( tokenType==TK_OVER ){
000655 assert( n==4 );
000656 tokenType = analyzeOverKeyword((const u8*)&zSql[4], lastTokenParsed);
000657 }else if( tokenType==TK_FILTER ){
000658 assert( n==6 );
000659 tokenType = analyzeFilterKeyword((const u8*)&zSql[6], lastTokenParsed);
000660 #endif /* SQLITE_OMIT_WINDOWFUNC */
000661 }else{
000662 Token x;
000663 x.z = zSql;
000664 x.n = n;
000665 sqlite3ErrorMsg(pParse, "unrecognized token: \"%T\"", &x);
000666 break;
000667 }
000668 }
000669 pParse->sLastToken.z = zSql;
000670 pParse->sLastToken.n = n;
000671 sqlite3Parser(pEngine, tokenType, pParse->sLastToken);
000672 lastTokenParsed = tokenType;
000673 zSql += n;
000674 assert( db->mallocFailed==0 || pParse->rc!=SQLITE_OK || startedWithOom );
000675 if( pParse->rc!=SQLITE_OK ) break;
000676 }
000677 assert( nErr==0 );
000678 #ifdef YYTRACKMAXSTACKDEPTH
000679 sqlite3_mutex_enter(sqlite3MallocMutex());
000680 sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK,
000681 sqlite3ParserStackPeak(pEngine)
000682 );
000683 sqlite3_mutex_leave(sqlite3MallocMutex());
000684 #endif /* YYDEBUG */
000685 #ifdef sqlite3Parser_ENGINEALWAYSONSTACK
000686 sqlite3ParserFinalize(pEngine);
000687 #else
000688 sqlite3ParserFree(pEngine, sqlite3_free);
000689 #endif
000690 if( db->mallocFailed ){
000691 pParse->rc = SQLITE_NOMEM_BKPT;
000692 }
000693 if( pParse->zErrMsg || (pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE) ){
000694 if( pParse->zErrMsg==0 ){
000695 pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc));
000696 }
000697 sqlite3_log(pParse->rc, "%s in \"%s\"", pParse->zErrMsg, pParse->zTail);
000698 nErr++;
000699 }
000700 pParse->zTail = zSql;
000701 #ifndef SQLITE_OMIT_VIRTUALTABLE
000702 sqlite3_free(pParse->apVtabLock);
000703 #endif
000704
000705 if( pParse->pNewTable && !IN_SPECIAL_PARSE ){
000706 /* If the pParse->declareVtab flag is set, do not delete any table
000707 ** structure built up in pParse->pNewTable. The calling code (see vtab.c)
000708 ** will take responsibility for freeing the Table structure.
000709 */
000710 sqlite3DeleteTable(db, pParse->pNewTable);
000711 }
000712 if( pParse->pNewTrigger && !IN_RENAME_OBJECT ){
000713 sqlite3DeleteTrigger(db, pParse->pNewTrigger);
000714 }
000715 if( pParse->pVList ) sqlite3DbNNFreeNN(db, pParse->pVList);
000716 db->pParse = pParentParse;
000717 assert( nErr==0 || pParse->rc!=SQLITE_OK );
000718 return nErr;
000719 }
000720
000721
000722 #ifdef SQLITE_ENABLE_NORMALIZE
000723 /*
000724 ** Insert a single space character into pStr if the current string
000725 ** ends with an identifier
000726 */
000727 static void addSpaceSeparator(sqlite3_str *pStr){
000728 if( pStr->nChar && sqlite3IsIdChar(pStr->zText[pStr->nChar-1]) ){
000729 sqlite3_str_append(pStr, " ", 1);
000730 }
000731 }
000732
000733 /*
000734 ** Compute a normalization of the SQL given by zSql[0..nSql-1]. Return
000735 ** the normalization in space obtained from sqlite3DbMalloc(). Or return
000736 ** NULL if anything goes wrong or if zSql is NULL.
000737 */
000738 char *sqlite3Normalize(
000739 Vdbe *pVdbe, /* VM being reprepared */
000740 const char *zSql /* The original SQL string */
000741 ){
000742 sqlite3 *db; /* The database connection */
000743 int i; /* Next unread byte of zSql[] */
000744 int n; /* length of current token */
000745 int tokenType; /* type of current token */
000746 int prevType = 0; /* Previous non-whitespace token */
000747 int nParen; /* Number of nested levels of parentheses */
000748 int iStartIN; /* Start of RHS of IN operator in z[] */
000749 int nParenAtIN; /* Value of nParent at start of RHS of IN operator */
000750 u32 j; /* Bytes of normalized SQL generated so far */
000751 sqlite3_str *pStr; /* The normalized SQL string under construction */
000752
000753 db = sqlite3VdbeDb(pVdbe);
000754 tokenType = -1;
000755 nParen = iStartIN = nParenAtIN = 0;
000756 pStr = sqlite3_str_new(db);
000757 assert( pStr!=0 ); /* sqlite3_str_new() never returns NULL */
000758 for(i=0; zSql[i] && pStr->accError==0; i+=n){
000759 if( tokenType!=TK_SPACE ){
000760 prevType = tokenType;
000761 }
000762 n = sqlite3GetToken((unsigned char*)zSql+i, &tokenType);
000763 if( NEVER(n<=0) ) break;
000764 switch( tokenType ){
000765 case TK_SPACE: {
000766 break;
000767 }
000768 case TK_NULL: {
000769 if( prevType==TK_IS || prevType==TK_NOT ){
000770 sqlite3_str_append(pStr, " NULL", 5);
000771 break;
000772 }
000773 /* Fall through */
000774 }
000775 case TK_STRING:
000776 case TK_INTEGER:
000777 case TK_FLOAT:
000778 case TK_VARIABLE:
000779 case TK_BLOB: {
000780 sqlite3_str_append(pStr, "?", 1);
000781 break;
000782 }
000783 case TK_LP: {
000784 nParen++;
000785 if( prevType==TK_IN ){
000786 iStartIN = pStr->nChar;
000787 nParenAtIN = nParen;
000788 }
000789 sqlite3_str_append(pStr, "(", 1);
000790 break;
000791 }
000792 case TK_RP: {
000793 if( iStartIN>0 && nParen==nParenAtIN ){
000794 assert( pStr->nChar>=(u32)iStartIN );
000795 pStr->nChar = iStartIN+1;
000796 sqlite3_str_append(pStr, "?,?,?", 5);
000797 iStartIN = 0;
000798 }
000799 nParen--;
000800 sqlite3_str_append(pStr, ")", 1);
000801 break;
000802 }
000803 case TK_ID: {
000804 iStartIN = 0;
000805 j = pStr->nChar;
000806 if( sqlite3Isquote(zSql[i]) ){
000807 char *zId = sqlite3DbStrNDup(db, zSql+i, n);
000808 int nId;
000809 int eType = 0;
000810 if( zId==0 ) break;
000811 sqlite3Dequote(zId);
000812 if( zSql[i]=='"' && sqlite3VdbeUsesDoubleQuotedString(pVdbe, zId) ){
000813 sqlite3_str_append(pStr, "?", 1);
000814 sqlite3DbFree(db, zId);
000815 break;
000816 }
000817 nId = sqlite3Strlen30(zId);
000818 if( sqlite3GetToken((u8*)zId, &eType)==nId && eType==TK_ID ){
000819 addSpaceSeparator(pStr);
000820 sqlite3_str_append(pStr, zId, nId);
000821 }else{
000822 sqlite3_str_appendf(pStr, "\"%w\"", zId);
000823 }
000824 sqlite3DbFree(db, zId);
000825 }else{
000826 addSpaceSeparator(pStr);
000827 sqlite3_str_append(pStr, zSql+i, n);
000828 }
000829 while( j<pStr->nChar ){
000830 pStr->zText[j] = sqlite3Tolower(pStr->zText[j]);
000831 j++;
000832 }
000833 break;
000834 }
000835 case TK_SELECT: {
000836 iStartIN = 0;
000837 /* fall through */
000838 }
000839 default: {
000840 if( sqlite3IsIdChar(zSql[i]) ) addSpaceSeparator(pStr);
000841 j = pStr->nChar;
000842 sqlite3_str_append(pStr, zSql+i, n);
000843 while( j<pStr->nChar ){
000844 pStr->zText[j] = sqlite3Toupper(pStr->zText[j]);
000845 j++;
000846 }
000847 break;
000848 }
000849 }
000850 }
000851 if( tokenType!=TK_SEMI ) sqlite3_str_append(pStr, ";", 1);
000852 return sqlite3_str_finish(pStr);
000853 }
000854 #endif /* SQLITE_ENABLE_NORMALIZE */