525 lines
15 KiB
C
525 lines
15 KiB
C
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/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** An tokenizer for SQL
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**
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** This file contains C code that splits an SQL input string up into
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** individual tokens and sends those tokens one-by-one over to the
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** parser for analysis.
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*/
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#include "sqliteInt.h"
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#include <stdlib.h>
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/*
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** The charMap() macro maps alphabetic characters into their
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** lower-case ASCII equivalent. On ASCII machines, this is just
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** an upper-to-lower case map. On EBCDIC machines we also need
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** to adjust the encoding. Only alphabetic characters and underscores
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** need to be translated.
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*/
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#ifdef SQLITE_ASCII
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# define charMap(X) sqlite3UpperToLower[(unsigned char)X]
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#endif
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#ifdef SQLITE_EBCDIC
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# define charMap(X) ebcdicToAscii[(unsigned char)X]
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const unsigned char ebcdicToAscii[] = {
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/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 0, 0, /* 6x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7x */
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0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* 8x */
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0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* 9x */
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0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ax */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
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0, 97, 98, 99,100,101,102,103,104,105, 0, 0, 0, 0, 0, 0, /* Cx */
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0,106,107,108,109,110,111,112,113,114, 0, 0, 0, 0, 0, 0, /* Dx */
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0, 0,115,116,117,118,119,120,121,122, 0, 0, 0, 0, 0, 0, /* Ex */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Fx */
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};
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#endif
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/*
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** The sqlite3KeywordCode function looks up an identifier to determine if
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** it is a keyword. If it is a keyword, the token code of that keyword is
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** returned. If the input is not a keyword, TK_ID is returned.
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**
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** The implementation of this routine was generated by a program,
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** mkkeywordhash.h, located in the tool subdirectory of the distribution.
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** The output of the mkkeywordhash.c program is written into a file
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** named keywordhash.h and then included into this source file by
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** the #include below.
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*/
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#include "keywordhash.h"
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/*
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** If X is a character that can be used in an identifier then
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** IdChar(X) will be true. Otherwise it is false.
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**
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** For ASCII, any character with the high-order bit set is
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** allowed in an identifier. For 7-bit characters,
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** sqlite3IsIdChar[X] must be 1.
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**
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** For EBCDIC, the rules are more complex but have the same
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** end result.
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**
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** Ticket #1066. the SQL standard does not allow '$' in the
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** middle of identfiers. But many SQL implementations do.
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** SQLite will allow '$' in identifiers for compatibility.
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** But the feature is undocumented.
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*/
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#ifdef SQLITE_ASCII
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#define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
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#endif
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#ifdef SQLITE_EBCDIC
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const char sqlite3IsEbcdicIdChar[] = {
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 4x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, /* 5x */
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0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, /* 6x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, /* 7x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, /* 8x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, /* 9x */
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1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, /* Ax */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* Bx */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Cx */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Dx */
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0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, /* Ex */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, /* Fx */
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};
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#define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
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#endif
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/*
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** Return the length of the token that begins at z[0].
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** Store the token type in *tokenType before returning.
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*/
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int sqlite3GetToken(const unsigned char *z, int *tokenType){
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int i, c;
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switch( *z ){
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case ' ': case '\t': case '\n': case '\f': case '\r': {
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testcase( z[0]==' ' );
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testcase( z[0]=='\t' );
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testcase( z[0]=='\n' );
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testcase( z[0]=='\f' );
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testcase( z[0]=='\r' );
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for(i=1; sqlite3Isspace(z[i]); i++){}
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*tokenType = TK_SPACE;
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return i;
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}
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case '-': {
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if( z[1]=='-' ){
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for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
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*tokenType = TK_SPACE; /* IMP: R-22934-25134 */
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return i;
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}
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*tokenType = TK_MINUS;
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return 1;
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}
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case '(': {
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*tokenType = TK_LP;
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return 1;
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}
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case ')': {
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*tokenType = TK_RP;
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return 1;
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}
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case ';': {
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*tokenType = TK_SEMI;
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return 1;
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}
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case '+': {
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*tokenType = TK_PLUS;
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return 1;
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}
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case '*': {
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*tokenType = TK_STAR;
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return 1;
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}
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case '/': {
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if( z[1]!='*' || z[2]==0 ){
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*tokenType = TK_SLASH;
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return 1;
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}
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for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
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if( c ) i++;
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*tokenType = TK_SPACE; /* IMP: R-22934-25134 */
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return i;
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}
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case '%': {
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*tokenType = TK_REM;
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return 1;
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}
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case '=': {
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*tokenType = TK_EQ;
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return 1 + (z[1]=='=');
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}
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case '<': {
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if( (c=z[1])=='=' ){
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*tokenType = TK_LE;
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return 2;
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}else if( c=='>' ){
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*tokenType = TK_NE;
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return 2;
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}else if( c=='<' ){
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*tokenType = TK_LSHIFT;
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return 2;
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}else{
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*tokenType = TK_LT;
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return 1;
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}
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}
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case '>': {
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if( (c=z[1])=='=' ){
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*tokenType = TK_GE;
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return 2;
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}else if( c=='>' ){
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*tokenType = TK_RSHIFT;
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return 2;
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}else{
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*tokenType = TK_GT;
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return 1;
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}
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}
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case '!': {
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if( z[1]!='=' ){
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*tokenType = TK_ILLEGAL;
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return 2;
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}else{
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*tokenType = TK_NE;
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return 2;
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}
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}
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case '|': {
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if( z[1]!='|' ){
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*tokenType = TK_BITOR;
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return 1;
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}else{
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*tokenType = TK_CONCAT;
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return 2;
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}
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}
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case ',': {
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*tokenType = TK_COMMA;
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return 1;
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}
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case '&': {
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*tokenType = TK_BITAND;
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return 1;
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}
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case '~': {
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*tokenType = TK_BITNOT;
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return 1;
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}
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case '`':
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case '\'':
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case '"': {
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int delim = z[0];
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testcase( delim=='`' );
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testcase( delim=='\'' );
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testcase( delim=='"' );
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for(i=1; (c=z[i])!=0; i++){
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if( c==delim ){
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if( z[i+1]==delim ){
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i++;
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}else{
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break;
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}
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}
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}
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if( c=='\'' ){
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*tokenType = TK_STRING;
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return i+1;
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}else if( c!=0 ){
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*tokenType = TK_ID;
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return i+1;
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}else{
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*tokenType = TK_ILLEGAL;
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return i;
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}
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}
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case '.': {
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#ifndef SQLITE_OMIT_FLOATING_POINT
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if( !sqlite3Isdigit(z[1]) )
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#endif
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{
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*tokenType = TK_DOT;
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return 1;
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}
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/* If the next character is a digit, this is a floating point
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** number that begins with ".". Fall thru into the next case */
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}
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9': {
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testcase( z[0]=='0' ); testcase( z[0]=='1' ); testcase( z[0]=='2' );
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testcase( z[0]=='3' ); testcase( z[0]=='4' ); testcase( z[0]=='5' );
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testcase( z[0]=='6' ); testcase( z[0]=='7' ); testcase( z[0]=='8' );
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testcase( z[0]=='9' );
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*tokenType = TK_INTEGER;
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for(i=0; sqlite3Isdigit(z[i]); i++){}
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#ifndef SQLITE_OMIT_FLOATING_POINT
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if( z[i]=='.' ){
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i++;
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while( sqlite3Isdigit(z[i]) ){ i++; }
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*tokenType = TK_FLOAT;
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}
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if( (z[i]=='e' || z[i]=='E') &&
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( sqlite3Isdigit(z[i+1])
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|| ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2]))
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)
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){
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i += 2;
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while( sqlite3Isdigit(z[i]) ){ i++; }
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*tokenType = TK_FLOAT;
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}
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#endif
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while( IdChar(z[i]) ){
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*tokenType = TK_ILLEGAL;
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i++;
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}
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return i;
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}
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case '[': {
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for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
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*tokenType = c==']' ? TK_ID : TK_ILLEGAL;
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return i;
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}
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case '?': {
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*tokenType = TK_VARIABLE;
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for(i=1; sqlite3Isdigit(z[i]); i++){}
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return i;
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}
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case '#': {
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for(i=1; sqlite3Isdigit(z[i]); i++){}
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if( i>1 ){
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/* Parameters of the form #NNN (where NNN is a number) are used
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** internally by sqlite3NestedParse. */
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*tokenType = TK_REGISTER;
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return i;
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}
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/* Fall through into the next case if the '#' is not followed by
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** a digit. Try to match #AAAA where AAAA is a parameter name. */
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}
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#ifndef SQLITE_OMIT_TCL_VARIABLE
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case '$':
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#endif
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case '@': /* For compatibility with MS SQL Server */
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case ':': {
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int n = 0;
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testcase( z[0]=='$' ); testcase( z[0]=='@' ); testcase( z[0]==':' );
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*tokenType = TK_VARIABLE;
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for(i=1; (c=z[i])!=0; i++){
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if( IdChar(c) ){
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n++;
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#ifndef SQLITE_OMIT_TCL_VARIABLE
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}else if( c=='(' && n>0 ){
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do{
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i++;
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}while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' );
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if( c==')' ){
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i++;
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}else{
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*tokenType = TK_ILLEGAL;
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}
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break;
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}else if( c==':' && z[i+1]==':' ){
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i++;
|
||
|
|
#endif
|
||
|
|
}else{
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if( n==0 ) *tokenType = TK_ILLEGAL;
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
#ifndef SQLITE_OMIT_BLOB_LITERAL
|
||
|
|
case 'x': case 'X': {
|
||
|
|
testcase( z[0]=='x' ); testcase( z[0]=='X' );
|
||
|
|
if( z[1]=='\'' ){
|
||
|
|
*tokenType = TK_BLOB;
|
||
|
|
for(i=2; sqlite3Isxdigit(z[i]); i++){}
|
||
|
|
if( z[i]!='\'' || i%2 ){
|
||
|
|
*tokenType = TK_ILLEGAL;
|
||
|
|
while( z[i] && z[i]!='\'' ){ i++; }
|
||
|
|
}
|
||
|
|
if( z[i] ) i++;
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
/* Otherwise fall through to the next case */
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
default: {
|
||
|
|
if( !IdChar(*z) ){
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
for(i=1; IdChar(z[i]); i++){}
|
||
|
|
*tokenType = keywordCode((char*)z, i);
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
*tokenType = TK_ILLEGAL;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
** Run the parser on the given SQL string. The parser structure is
|
||
|
|
** passed in. An SQLITE_ status code is returned. If an error occurs
|
||
|
|
** then an and attempt is made to write an error message into
|
||
|
|
** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that
|
||
|
|
** error message.
|
||
|
|
*/
|
||
|
|
int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
|
||
|
|
int nErr = 0; /* Number of errors encountered */
|
||
|
|
int i; /* Loop counter */
|
||
|
|
void *pEngine; /* The LEMON-generated LALR(1) parser */
|
||
|
|
int tokenType; /* type of the next token */
|
||
|
|
int lastTokenParsed = -1; /* type of the previous token */
|
||
|
|
u8 enableLookaside; /* Saved value of db->lookaside.bEnabled */
|
||
|
|
sqlite3 *db = pParse->db; /* The database connection */
|
||
|
|
int mxSqlLen; /* Max length of an SQL string */
|
||
|
|
|
||
|
|
|
||
|
|
mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
|
||
|
|
if( db->nVdbeActive==0 ){
|
||
|
|
db->u1.isInterrupted = 0;
|
||
|
|
}
|
||
|
|
pParse->rc = SQLITE_OK;
|
||
|
|
pParse->zTail = zSql;
|
||
|
|
i = 0;
|
||
|
|
assert( pzErrMsg!=0 );
|
||
|
|
pEngine = sqlite3ParserAlloc((void*(*)(size_t))sqlite3Malloc);
|
||
|
|
if( pEngine==0 ){
|
||
|
|
db->mallocFailed = 1;
|
||
|
|
return SQLITE_NOMEM;
|
||
|
|
}
|
||
|
|
assert( pParse->pNewTable==0 );
|
||
|
|
assert( pParse->pNewTrigger==0 );
|
||
|
|
assert( pParse->nVar==0 );
|
||
|
|
assert( pParse->nzVar==0 );
|
||
|
|
assert( pParse->azVar==0 );
|
||
|
|
enableLookaside = db->lookaside.bEnabled;
|
||
|
|
if( db->lookaside.pStart ) db->lookaside.bEnabled = 1;
|
||
|
|
while( !db->mallocFailed && zSql[i]!=0 ){
|
||
|
|
assert( i>=0 );
|
||
|
|
pParse->sLastToken.z = &zSql[i];
|
||
|
|
pParse->sLastToken.n = sqlite3GetToken((unsigned char*)&zSql[i],&tokenType);
|
||
|
|
i += pParse->sLastToken.n;
|
||
|
|
if( i>mxSqlLen ){
|
||
|
|
pParse->rc = SQLITE_TOOBIG;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
switch( tokenType ){
|
||
|
|
case TK_SPACE: {
|
||
|
|
if( db->u1.isInterrupted ){
|
||
|
|
sqlite3ErrorMsg(pParse, "interrupt");
|
||
|
|
pParse->rc = SQLITE_INTERRUPT;
|
||
|
|
goto abort_parse;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case TK_ILLEGAL: {
|
||
|
|
sqlite3DbFree(db, *pzErrMsg);
|
||
|
|
*pzErrMsg = sqlite3MPrintf(db, "unrecognized token: \"%T\"",
|
||
|
|
&pParse->sLastToken);
|
||
|
|
nErr++;
|
||
|
|
goto abort_parse;
|
||
|
|
}
|
||
|
|
case TK_SEMI: {
|
||
|
|
pParse->zTail = &zSql[i];
|
||
|
|
/* Fall thru into the default case */
|
||
|
|
}
|
||
|
|
default: {
|
||
|
|
sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
|
||
|
|
lastTokenParsed = tokenType;
|
||
|
|
if( pParse->rc!=SQLITE_OK ){
|
||
|
|
goto abort_parse;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
abort_parse:
|
||
|
|
if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
|
||
|
|
if( lastTokenParsed!=TK_SEMI ){
|
||
|
|
sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
|
||
|
|
pParse->zTail = &zSql[i];
|
||
|
|
}
|
||
|
|
sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
|
||
|
|
}
|
||
|
|
#ifdef YYTRACKMAXSTACKDEPTH
|
||
|
|
sqlite3StatusSet(SQLITE_STATUS_PARSER_STACK,
|
||
|
|
sqlite3ParserStackPeak(pEngine)
|
||
|
|
);
|
||
|
|
#endif /* YYDEBUG */
|
||
|
|
sqlite3ParserFree(pEngine, sqlite3_free);
|
||
|
|
db->lookaside.bEnabled = enableLookaside;
|
||
|
|
if( db->mallocFailed ){
|
||
|
|
pParse->rc = SQLITE_NOMEM;
|
||
|
|
}
|
||
|
|
if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
|
||
|
|
sqlite3SetString(&pParse->zErrMsg, db, "%s", sqlite3ErrStr(pParse->rc));
|
||
|
|
}
|
||
|
|
assert( pzErrMsg!=0 );
|
||
|
|
if( pParse->zErrMsg ){
|
||
|
|
*pzErrMsg = pParse->zErrMsg;
|
||
|
|
sqlite3_log(pParse->rc, "%s", *pzErrMsg);
|
||
|
|
pParse->zErrMsg = 0;
|
||
|
|
nErr++;
|
||
|
|
}
|
||
|
|
if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){
|
||
|
|
sqlite3VdbeDelete(pParse->pVdbe);
|
||
|
|
pParse->pVdbe = 0;
|
||
|
|
}
|
||
|
|
#ifndef SQLITE_OMIT_SHARED_CACHE
|
||
|
|
if( pParse->nested==0 ){
|
||
|
|
sqlite3DbFree(db, pParse->aTableLock);
|
||
|
|
pParse->aTableLock = 0;
|
||
|
|
pParse->nTableLock = 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#ifndef SQLITE_OMIT_VIRTUALTABLE
|
||
|
|
sqlite3_free(pParse->apVtabLock);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
if( !IN_DECLARE_VTAB ){
|
||
|
|
/* If the pParse->declareVtab flag is set, do not delete any table
|
||
|
|
** structure built up in pParse->pNewTable. The calling code (see vtab.c)
|
||
|
|
** will take responsibility for freeing the Table structure.
|
||
|
|
*/
|
||
|
|
sqlite3DeleteTable(db, pParse->pNewTable);
|
||
|
|
}
|
||
|
|
|
||
|
|
sqlite3DeleteTrigger(db, pParse->pNewTrigger);
|
||
|
|
for(i=pParse->nzVar-1; i>=0; i--) sqlite3DbFree(db, pParse->azVar[i]);
|
||
|
|
sqlite3DbFree(db, pParse->azVar);
|
||
|
|
sqlite3DbFree(db, pParse->aAlias);
|
||
|
|
while( pParse->pAinc ){
|
||
|
|
AutoincInfo *p = pParse->pAinc;
|
||
|
|
pParse->pAinc = p->pNext;
|
||
|
|
sqlite3DbFree(db, p);
|
||
|
|
}
|
||
|
|
while( pParse->pZombieTab ){
|
||
|
|
Table *p = pParse->pZombieTab;
|
||
|
|
pParse->pZombieTab = p->pNextZombie;
|
||
|
|
sqlite3DeleteTable(db, p);
|
||
|
|
}
|
||
|
|
if( nErr>0 && pParse->rc==SQLITE_OK ){
|
||
|
|
pParse->rc = SQLITE_ERROR;
|
||
|
|
}
|
||
|
|
return nErr;
|
||
|
|
}
|