Annotation of embedaddon/sqlite3/src/tokenize.c, revision 1.1
1.1 ! misho 1: /*
! 2: ** 2001 September 15
! 3: **
! 4: ** The author disclaims copyright to this source code. In place of
! 5: ** a legal notice, here is a blessing:
! 6: **
! 7: ** May you do good and not evil.
! 8: ** May you find forgiveness for yourself and forgive others.
! 9: ** May you share freely, never taking more than you give.
! 10: **
! 11: *************************************************************************
! 12: ** An tokenizer for SQL
! 13: **
! 14: ** This file contains C code that splits an SQL input string up into
! 15: ** individual tokens and sends those tokens one-by-one over to the
! 16: ** parser for analysis.
! 17: */
! 18: #include "sqliteInt.h"
! 19: #include <stdlib.h>
! 20:
! 21: /*
! 22: ** The charMap() macro maps alphabetic characters into their
! 23: ** lower-case ASCII equivalent. On ASCII machines, this is just
! 24: ** an upper-to-lower case map. On EBCDIC machines we also need
! 25: ** to adjust the encoding. Only alphabetic characters and underscores
! 26: ** need to be translated.
! 27: */
! 28: #ifdef SQLITE_ASCII
! 29: # define charMap(X) sqlite3UpperToLower[(unsigned char)X]
! 30: #endif
! 31: #ifdef SQLITE_EBCDIC
! 32: # define charMap(X) ebcdicToAscii[(unsigned char)X]
! 33: const unsigned char ebcdicToAscii[] = {
! 34: /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
! 35: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
! 36: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
! 37: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */
! 38: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3x */
! 39: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4x */
! 40: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5x */
! 41: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 0, 0, /* 6x */
! 42: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7x */
! 43: 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* 8x */
! 44: 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* 9x */
! 45: 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ax */
! 46: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
! 47: 0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* Cx */
! 48: 0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* Dx */
! 49: 0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ex */
! 50: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Fx */
! 51: };
! 52: #endif
! 53:
! 54: /*
! 55: ** The sqlite3KeywordCode function looks up an identifier to determine if
! 56: ** it is a keyword. If it is a keyword, the token code of that keyword is
! 57: ** returned. If the input is not a keyword, TK_ID is returned.
! 58: **
! 59: ** The implementation of this routine was generated by a program,
! 60: ** mkkeywordhash.h, located in the tool subdirectory of the distribution.
! 61: ** The output of the mkkeywordhash.c program is written into a file
! 62: ** named keywordhash.h and then included into this source file by
! 63: ** the #include below.
! 64: */
! 65: #include "keywordhash.h"
! 66:
! 67:
! 68: /*
! 69: ** If X is a character that can be used in an identifier then
! 70: ** IdChar(X) will be true. Otherwise it is false.
! 71: **
! 72: ** For ASCII, any character with the high-order bit set is
! 73: ** allowed in an identifier. For 7-bit characters,
! 74: ** sqlite3IsIdChar[X] must be 1.
! 75: **
! 76: ** For EBCDIC, the rules are more complex but have the same
! 77: ** end result.
! 78: **
! 79: ** Ticket #1066. the SQL standard does not allow '$' in the
! 80: ** middle of identfiers. But many SQL implementations do.
! 81: ** SQLite will allow '$' in identifiers for compatibility.
! 82: ** But the feature is undocumented.
! 83: */
! 84: #ifdef SQLITE_ASCII
! 85: #define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
! 86: #endif
! 87: #ifdef SQLITE_EBCDIC
! 88: const char sqlite3IsEbcdicIdChar[] = {
! 89: /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
! 90: 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 4x */
! 91: 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, /* 5x */
! 92: 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, /* 6x */
! 93: 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, /* 7x */
! 94: 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, /* 8x */
! 95: 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, /* 9x */
! 96: 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, /* Ax */
! 97: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
! 98: 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Cx */
! 99: 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Dx */
! 100: 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Ex */
! 101: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, /* Fx */
! 102: };
! 103: #define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
! 104: #endif
! 105:
! 106:
! 107: /*
! 108: ** Return the length of the token that begins at z[0].
! 109: ** Store the token type in *tokenType before returning.
! 110: */
! 111: int sqlite3GetToken(const unsigned char *z, int *tokenType){
! 112: int i, c;
! 113: switch( *z ){
! 114: case ' ': case '\t': case '\n': case '\f': case '\r': {
! 115: testcase( z[0]==' ' );
! 116: testcase( z[0]=='\t' );
! 117: testcase( z[0]=='\n' );
! 118: testcase( z[0]=='\f' );
! 119: testcase( z[0]=='\r' );
! 120: for(i=1; sqlite3Isspace(z[i]); i++){}
! 121: *tokenType = TK_SPACE;
! 122: return i;
! 123: }
! 124: case '-': {
! 125: if( z[1]=='-' ){
! 126: /* IMP: R-50417-27976 -- syntax diagram for comments */
! 127: for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
! 128: *tokenType = TK_SPACE; /* IMP: R-22934-25134 */
! 129: return i;
! 130: }
! 131: *tokenType = TK_MINUS;
! 132: return 1;
! 133: }
! 134: case '(': {
! 135: *tokenType = TK_LP;
! 136: return 1;
! 137: }
! 138: case ')': {
! 139: *tokenType = TK_RP;
! 140: return 1;
! 141: }
! 142: case ';': {
! 143: *tokenType = TK_SEMI;
! 144: return 1;
! 145: }
! 146: case '+': {
! 147: *tokenType = TK_PLUS;
! 148: return 1;
! 149: }
! 150: case '*': {
! 151: *tokenType = TK_STAR;
! 152: return 1;
! 153: }
! 154: case '/': {
! 155: if( z[1]!='*' || z[2]==0 ){
! 156: *tokenType = TK_SLASH;
! 157: return 1;
! 158: }
! 159: /* IMP: R-50417-27976 -- syntax diagram for comments */
! 160: for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
! 161: if( c ) i++;
! 162: *tokenType = TK_SPACE; /* IMP: R-22934-25134 */
! 163: return i;
! 164: }
! 165: case '%': {
! 166: *tokenType = TK_REM;
! 167: return 1;
! 168: }
! 169: case '=': {
! 170: *tokenType = TK_EQ;
! 171: return 1 + (z[1]=='=');
! 172: }
! 173: case '<': {
! 174: if( (c=z[1])=='=' ){
! 175: *tokenType = TK_LE;
! 176: return 2;
! 177: }else if( c=='>' ){
! 178: *tokenType = TK_NE;
! 179: return 2;
! 180: }else if( c=='<' ){
! 181: *tokenType = TK_LSHIFT;
! 182: return 2;
! 183: }else{
! 184: *tokenType = TK_LT;
! 185: return 1;
! 186: }
! 187: }
! 188: case '>': {
! 189: if( (c=z[1])=='=' ){
! 190: *tokenType = TK_GE;
! 191: return 2;
! 192: }else if( c=='>' ){
! 193: *tokenType = TK_RSHIFT;
! 194: return 2;
! 195: }else{
! 196: *tokenType = TK_GT;
! 197: return 1;
! 198: }
! 199: }
! 200: case '!': {
! 201: if( z[1]!='=' ){
! 202: *tokenType = TK_ILLEGAL;
! 203: return 2;
! 204: }else{
! 205: *tokenType = TK_NE;
! 206: return 2;
! 207: }
! 208: }
! 209: case '|': {
! 210: if( z[1]!='|' ){
! 211: *tokenType = TK_BITOR;
! 212: return 1;
! 213: }else{
! 214: *tokenType = TK_CONCAT;
! 215: return 2;
! 216: }
! 217: }
! 218: case ',': {
! 219: *tokenType = TK_COMMA;
! 220: return 1;
! 221: }
! 222: case '&': {
! 223: *tokenType = TK_BITAND;
! 224: return 1;
! 225: }
! 226: case '~': {
! 227: *tokenType = TK_BITNOT;
! 228: return 1;
! 229: }
! 230: case '`':
! 231: case '\'':
! 232: case '"': {
! 233: int delim = z[0];
! 234: testcase( delim=='`' );
! 235: testcase( delim=='\'' );
! 236: testcase( delim=='"' );
! 237: for(i=1; (c=z[i])!=0; i++){
! 238: if( c==delim ){
! 239: if( z[i+1]==delim ){
! 240: i++;
! 241: }else{
! 242: break;
! 243: }
! 244: }
! 245: }
! 246: if( c=='\'' ){
! 247: *tokenType = TK_STRING;
! 248: return i+1;
! 249: }else if( c!=0 ){
! 250: *tokenType = TK_ID;
! 251: return i+1;
! 252: }else{
! 253: *tokenType = TK_ILLEGAL;
! 254: return i;
! 255: }
! 256: }
! 257: case '.': {
! 258: #ifndef SQLITE_OMIT_FLOATING_POINT
! 259: if( !sqlite3Isdigit(z[1]) )
! 260: #endif
! 261: {
! 262: *tokenType = TK_DOT;
! 263: return 1;
! 264: }
! 265: /* If the next character is a digit, this is a floating point
! 266: ** number that begins with ".". Fall thru into the next case */
! 267: }
! 268: case '0': case '1': case '2': case '3': case '4':
! 269: case '5': case '6': case '7': case '8': case '9': {
! 270: testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' );
! 271: testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' );
! 272: testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' );
! 273: testcase( z[0]=='9' );
! 274: *tokenType = TK_INTEGER;
! 275: for(i=0; sqlite3Isdigit(z[i]); i++){}
! 276: #ifndef SQLITE_OMIT_FLOATING_POINT
! 277: if( z[i]=='.' ){
! 278: i++;
! 279: while( sqlite3Isdigit(z[i]) ){ i++; }
! 280: *tokenType = TK_FLOAT;
! 281: }
! 282: if( (z[i]=='e' || z[i]=='E') &&
! 283: ( sqlite3Isdigit(z[i+1])
! 284: || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2]))
! 285: )
! 286: ){
! 287: i += 2;
! 288: while( sqlite3Isdigit(z[i]) ){ i++; }
! 289: *tokenType = TK_FLOAT;
! 290: }
! 291: #endif
! 292: while( IdChar(z[i]) ){
! 293: *tokenType = TK_ILLEGAL;
! 294: i++;
! 295: }
! 296: return i;
! 297: }
! 298: case '[': {
! 299: for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
! 300: *tokenType = c==']' ? TK_ID : TK_ILLEGAL;
! 301: return i;
! 302: }
! 303: case '?': {
! 304: *tokenType = TK_VARIABLE;
! 305: for(i=1; sqlite3Isdigit(z[i]); i++){}
! 306: return i;
! 307: }
! 308: case '#': {
! 309: for(i=1; sqlite3Isdigit(z[i]); i++){}
! 310: if( i>1 ){
! 311: /* Parameters of the form #NNN (where NNN is a number) are used
! 312: ** internally by sqlite3NestedParse. */
! 313: *tokenType = TK_REGISTER;
! 314: return i;
! 315: }
! 316: /* Fall through into the next case if the '#' is not followed by
! 317: ** a digit. Try to match #AAAA where AAAA is a parameter name. */
! 318: }
! 319: #ifndef SQLITE_OMIT_TCL_VARIABLE
! 320: case '$':
! 321: #endif
! 322: case '@': /* For compatibility with MS SQL Server */
! 323: case ':': {
! 324: int n = 0;
! 325: testcase( z[0]=='$' ); testcase( z[0]=='@' ); testcase( z[0]==':' );
! 326: *tokenType = TK_VARIABLE;
! 327: for(i=1; (c=z[i])!=0; i++){
! 328: if( IdChar(c) ){
! 329: n++;
! 330: #ifndef SQLITE_OMIT_TCL_VARIABLE
! 331: }else if( c=='(' && n>0 ){
! 332: do{
! 333: i++;
! 334: }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' );
! 335: if( c==')' ){
! 336: i++;
! 337: }else{
! 338: *tokenType = TK_ILLEGAL;
! 339: }
! 340: break;
! 341: }else if( c==':' && z[i+1]==':' ){
! 342: i++;
! 343: #endif
! 344: }else{
! 345: break;
! 346: }
! 347: }
! 348: if( n==0 ) *tokenType = TK_ILLEGAL;
! 349: return i;
! 350: }
! 351: #ifndef SQLITE_OMIT_BLOB_LITERAL
! 352: case 'x': case 'X': {
! 353: testcase( z[0]=='x' ); testcase( z[0]=='X' );
! 354: if( z[1]=='\'' ){
! 355: *tokenType = TK_BLOB;
! 356: for(i=2; sqlite3Isxdigit(z[i]); i++){}
! 357: if( z[i]!='\'' || i%2 ){
! 358: *tokenType = TK_ILLEGAL;
! 359: while( z[i] && z[i]!='\'' ){ i++; }
! 360: }
! 361: if( z[i] ) i++;
! 362: return i;
! 363: }
! 364: /* Otherwise fall through to the next case */
! 365: }
! 366: #endif
! 367: default: {
! 368: if( !IdChar(*z) ){
! 369: break;
! 370: }
! 371: for(i=1; IdChar(z[i]); i++){}
! 372: *tokenType = keywordCode((char*)z, i);
! 373: return i;
! 374: }
! 375: }
! 376: *tokenType = TK_ILLEGAL;
! 377: return 1;
! 378: }
! 379:
! 380: /*
! 381: ** Run the parser on the given SQL string. The parser structure is
! 382: ** passed in. An SQLITE_ status code is returned. If an error occurs
! 383: ** then an and attempt is made to write an error message into
! 384: ** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that
! 385: ** error message.
! 386: */
! 387: int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
! 388: int nErr = 0; /* Number of errors encountered */
! 389: int i; /* Loop counter */
! 390: void *pEngine; /* The LEMON-generated LALR(1) parser */
! 391: int tokenType; /* type of the next token */
! 392: int lastTokenParsed = -1; /* type of the previous token */
! 393: u8 enableLookaside; /* Saved value of db->lookaside.bEnabled */
! 394: sqlite3 *db = pParse->db; /* The database connection */
! 395: int mxSqlLen; /* Max length of an SQL string */
! 396:
! 397:
! 398: mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
! 399: if( db->activeVdbeCnt==0 ){
! 400: db->u1.isInterrupted = 0;
! 401: }
! 402: pParse->rc = SQLITE_OK;
! 403: pParse->zTail = zSql;
! 404: i = 0;
! 405: assert( pzErrMsg!=0 );
! 406: pEngine = sqlite3ParserAlloc((void*(*)(size_t))sqlite3Malloc);
! 407: if( pEngine==0 ){
! 408: db->mallocFailed = 1;
! 409: return SQLITE_NOMEM;
! 410: }
! 411: assert( pParse->pNewTable==0 );
! 412: assert( pParse->pNewTrigger==0 );
! 413: assert( pParse->nVar==0 );
! 414: assert( pParse->nzVar==0 );
! 415: assert( pParse->azVar==0 );
! 416: enableLookaside = db->lookaside.bEnabled;
! 417: if( db->lookaside.pStart ) db->lookaside.bEnabled = 1;
! 418: while( !db->mallocFailed && zSql[i]!=0 ){
! 419: assert( i>=0 );
! 420: pParse->sLastToken.z = &zSql[i];
! 421: pParse->sLastToken.n = sqlite3GetToken((unsigned char*)&zSql[i],&tokenType);
! 422: i += pParse->sLastToken.n;
! 423: if( i>mxSqlLen ){
! 424: pParse->rc = SQLITE_TOOBIG;
! 425: break;
! 426: }
! 427: switch( tokenType ){
! 428: case TK_SPACE: {
! 429: if( db->u1.isInterrupted ){
! 430: sqlite3ErrorMsg(pParse, "interrupt");
! 431: pParse->rc = SQLITE_INTERRUPT;
! 432: goto abort_parse;
! 433: }
! 434: break;
! 435: }
! 436: case TK_ILLEGAL: {
! 437: sqlite3DbFree(db, *pzErrMsg);
! 438: *pzErrMsg = sqlite3MPrintf(db, "unrecognized token: \"%T\"",
! 439: &pParse->sLastToken);
! 440: nErr++;
! 441: goto abort_parse;
! 442: }
! 443: case TK_SEMI: {
! 444: pParse->zTail = &zSql[i];
! 445: /* Fall thru into the default case */
! 446: }
! 447: default: {
! 448: sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
! 449: lastTokenParsed = tokenType;
! 450: if( pParse->rc!=SQLITE_OK ){
! 451: goto abort_parse;
! 452: }
! 453: break;
! 454: }
! 455: }
! 456: }
! 457: abort_parse:
! 458: if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
! 459: if( lastTokenParsed!=TK_SEMI ){
! 460: sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
! 461: pParse->zTail = &zSql[i];
! 462: }
! 463: sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
! 464: }
! 465: #ifdef YYTRACKMAXSTACKDEPTH
! 466: sqlite3StatusSet(SQLITE_STATUS_PARSER_STACK,
! 467: sqlite3ParserStackPeak(pEngine)
! 468: );
! 469: #endif /* YYDEBUG */
! 470: sqlite3ParserFree(pEngine, sqlite3_free);
! 471: db->lookaside.bEnabled = enableLookaside;
! 472: if( db->mallocFailed ){
! 473: pParse->rc = SQLITE_NOMEM;
! 474: }
! 475: if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
! 476: sqlite3SetString(&pParse->zErrMsg, db, "%s", sqlite3ErrStr(pParse->rc));
! 477: }
! 478: assert( pzErrMsg!=0 );
! 479: if( pParse->zErrMsg ){
! 480: *pzErrMsg = pParse->zErrMsg;
! 481: sqlite3_log(pParse->rc, "%s", *pzErrMsg);
! 482: pParse->zErrMsg = 0;
! 483: nErr++;
! 484: }
! 485: if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){
! 486: sqlite3VdbeDelete(pParse->pVdbe);
! 487: pParse->pVdbe = 0;
! 488: }
! 489: #ifndef SQLITE_OMIT_SHARED_CACHE
! 490: if( pParse->nested==0 ){
! 491: sqlite3DbFree(db, pParse->aTableLock);
! 492: pParse->aTableLock = 0;
! 493: pParse->nTableLock = 0;
! 494: }
! 495: #endif
! 496: #ifndef SQLITE_OMIT_VIRTUALTABLE
! 497: sqlite3_free(pParse->apVtabLock);
! 498: #endif
! 499:
! 500: if( !IN_DECLARE_VTAB ){
! 501: /* If the pParse->declareVtab flag is set, do not delete any table
! 502: ** structure built up in pParse->pNewTable. The calling code (see vtab.c)
! 503: ** will take responsibility for freeing the Table structure.
! 504: */
! 505: sqlite3DeleteTable(db, pParse->pNewTable);
! 506: }
! 507:
! 508: sqlite3DeleteTrigger(db, pParse->pNewTrigger);
! 509: for(i=pParse->nzVar-1; i>=0; i--) sqlite3DbFree(db, pParse->azVar[i]);
! 510: sqlite3DbFree(db, pParse->azVar);
! 511: sqlite3DbFree(db, pParse->aAlias);
! 512: while( pParse->pAinc ){
! 513: AutoincInfo *p = pParse->pAinc;
! 514: pParse->pAinc = p->pNext;
! 515: sqlite3DbFree(db, p);
! 516: }
! 517: while( pParse->pZombieTab ){
! 518: Table *p = pParse->pZombieTab;
! 519: pParse->pZombieTab = p->pNextZombie;
! 520: sqlite3DeleteTable(db, p);
! 521: }
! 522: if( nErr>0 && pParse->rc==SQLITE_OK ){
! 523: pParse->rc = SQLITE_ERROR;
! 524: }
! 525: return nErr;
! 526: }
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