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434 lines
12 KiB
434 lines
12 KiB
/*
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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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** $Id: tokenize.c 548347 2006-06-05 10:53:00Z staniek $
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*/
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#include "sqliteInt.h"
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#include "os.h"
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#include <ctype.h>
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#include <stdlib.h>
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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 and
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** X&0x80==0 then sqlite3IsIdChar[X] will be 1. If X&0x80==0x80 then
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** X is always an identifier character. (Hence all UTF-8
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** characters can be part of an identifier). sqlite3IsIdChar[X] will
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** be 0 for every character in the lower 128 ASCII characters
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** that cannot be used as part of an identifier.
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**
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** In this implementation, an identifier can be a string of
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** alphabetic characters, digits, and "_" plus any character
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** with the high-order bit set. The latter rule means that
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** any sequence of UTF-8 characters or characters taken from
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** an extended ISO8859 character set can form an identifier.
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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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const char sqlite3IsIdChar[] = {
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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, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 3x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 4x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, /* 5x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, /* 7x */
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};
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#define IdChar(C) (((c=C)&0x80)!=0 || (c>0x1f && sqlite3IsIdChar[c-0x20]))
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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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static int getToken(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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for(i=1; isspace(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_COMMENT;
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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_COMMENT;
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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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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 ) i++;
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*tokenType = TK_STRING;
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return i;
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}
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case '.': {
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#ifndef SQLITE_OMIT_FLOATING_POINT
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if( !isdigit(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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*tokenType = TK_INTEGER;
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for(i=0; isdigit(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( isdigit(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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( isdigit(z[i+1])
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|| ((z[i+1]=='+' || z[i+1]=='-') && isdigit(z[i+2]))
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)
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){
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i += 2;
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while( isdigit(z[i]) ){ i++; }
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*tokenType = TK_FLOAT;
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}
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#endif
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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 = TK_ID;
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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; isdigit(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; isdigit(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 ':': {
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int n = 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 && !isspace(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++;
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#endif
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}else{
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break;
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}
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}
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if( n==0 ) *tokenType = TK_ILLEGAL;
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return i;
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}
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#ifndef SQLITE_OMIT_BLOB_LITERAL
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case 'x': case 'X': {
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if( (c=z[1])=='\'' || c=='"' ){
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int delim = c;
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*tokenType = TK_BLOB;
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for(i=2; (c=z[i])!=0; i++){
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if( c==delim ){
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if( i%2 ) *tokenType = TK_ILLEGAL;
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break;
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}
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if( !isxdigit(c) ){
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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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if( c ) i++;
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return i;
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}
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/* Otherwise fall through to the next case */
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}
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#endif
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default: {
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if( !IdChar(*z) ){
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break;
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}
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for(i=1; IdChar(z[i]); i++){}
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*tokenType = keywordCode((char*)z, i);
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return i;
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}
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}
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*tokenType = TK_ILLEGAL;
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return 1;
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}
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int sqlite3GetToken(const unsigned char *z, int *tokenType){
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return getToken(z, tokenType);
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}
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/*
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** Run the parser on the given SQL string. The parser structure is
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** passed in. An SQLITE_ status code is returned. If an error occurs
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** and pzErrMsg!=NULL then an error message might be written into
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** memory obtained from malloc() and *pzErrMsg made to point to that
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** error message. Or maybe not.
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*/
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int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
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int nErr = 0;
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int i;
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void *pEngine;
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int tokenType;
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int lastTokenParsed = -1;
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sqlite3 *db = pParse->db;
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extern void *sqlite3ParserAlloc(void*(*)(int));
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extern void sqlite3ParserFree(void*, void(*)(void*));
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extern int sqlite3Parser(void*, int, Token, Parse*);
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db->flags &= ~SQLITE_Interrupt;
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pParse->rc = SQLITE_OK;
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i = 0;
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pEngine = sqlite3ParserAlloc((void*(*)(int))sqlite3MallocX);
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if( pEngine==0 ){
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sqlite3SetString(pzErrMsg, "out of memory", (char*)0);
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return SQLITE_NOMEM;
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}
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assert( pParse->sLastToken.dyn==0 );
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assert( pParse->pNewTable==0 );
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assert( pParse->pNewTrigger==0 );
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assert( pParse->nVar==0 );
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assert( pParse->nVarExpr==0 );
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assert( pParse->nVarExprAlloc==0 );
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assert( pParse->apVarExpr==0 );
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pParse->zTail = pParse->zSql = zSql;
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while( sqlite3_malloc_failed==0 && zSql[i]!=0 ){
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assert( i>=0 );
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pParse->sLastToken.z = &zSql[i];
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assert( pParse->sLastToken.dyn==0 );
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pParse->sLastToken.n = getToken((unsigned char*)&zSql[i],&tokenType);
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i += pParse->sLastToken.n;
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switch( tokenType ){
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case TK_SPACE:
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case TK_COMMENT: {
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if( (db->flags & SQLITE_Interrupt)!=0 ){
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pParse->rc = SQLITE_INTERRUPT;
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sqlite3SetString(pzErrMsg, "interrupt", (char*)0);
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goto abort_parse;
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}
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break;
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}
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case TK_ILLEGAL: {
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if( pzErrMsg ){
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sqliteFree(*pzErrMsg);
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*pzErrMsg = sqlite3MPrintf("unrecognized token: \"%T\"",
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&pParse->sLastToken);
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}
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nErr++;
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goto abort_parse;
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}
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case TK_SEMI: {
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pParse->zTail = &zSql[i];
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/* Fall thru into the default case */
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}
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default: {
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sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
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lastTokenParsed = tokenType;
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if( pParse->rc!=SQLITE_OK ){
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goto abort_parse;
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}
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break;
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}
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}
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}
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abort_parse:
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if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
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if( lastTokenParsed!=TK_SEMI ){
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sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
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pParse->zTail = &zSql[i];
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}
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sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
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}
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sqlite3ParserFree(pEngine, sqlite3FreeX);
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if( sqlite3_malloc_failed ){
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pParse->rc = SQLITE_NOMEM;
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}
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if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
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sqlite3SetString(&pParse->zErrMsg, sqlite3ErrStr(pParse->rc),
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(char*)0);
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}
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if( pParse->zErrMsg ){
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if( pzErrMsg && *pzErrMsg==0 ){
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*pzErrMsg = pParse->zErrMsg;
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}else{
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sqliteFree(pParse->zErrMsg);
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}
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pParse->zErrMsg = 0;
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if( !nErr ) nErr++;
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}
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if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){
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sqlite3VdbeDelete(pParse->pVdbe);
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pParse->pVdbe = 0;
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}
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sqlite3DeleteTable(pParse->db, pParse->pNewTable);
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sqlite3DeleteTrigger(pParse->pNewTrigger);
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sqliteFree(pParse->apVarExpr);
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if( nErr>0 && (pParse->rc==SQLITE_OK || pParse->rc==SQLITE_DONE) ){
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pParse->rc = SQLITE_ERROR;
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}
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return nErr;
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}
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