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373 lines (364 loc) · 12 KB
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that implements the sqlite3_complete() API.
** This code used to be part of the tokenizer.c source file. But by
** separating it out, the code will be automatically omitted from
** static links that do not use it.
*/
#include "sqliteInt.h"
#ifndef SQLITE_OMIT_COMPLETE
/*
** This is defined in tokenize.c. We just have to import the definition.
*/
#ifndef SQLITE_AMALGAMATION
#ifdef SQLITE_ASCII
#define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
#endif
#ifdef SQLITE_EBCDIC
extern const char sqlite3IsEbcdicIdChar[];
#define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
#endif
#endif /* SQLITE_AMALGAMATION */
/*
** Token types used by the sqlite3_complete() routine. See the header
** comments on that procedure for additional information.
*/
#define tkSEMI 0
#define tkWS 1
#define tkOTHER 2
#ifndef SQLITE_OMIT_TRIGGER
#define tkEXPLAIN 3
#define tkCREATE 4
#define tkTEMP 5
#define tkTRIGGER 6
#define tkEND 7
#endif
/*
** Return zero if the given SQL string is complete - if all comments,
** string and blob literals, and quoted identifiers have been closed and
** if the entire string ends with ";" and possibly with ";END;" if the
** string is a CREATE TRIGGER statement. A non-zero return indicates
** that the string is empty or incomplete. Bits of the return value
** indicate what is missing and is needed to close out the statement.
**
** Special handling is require for CREATE TRIGGER statements.
** Whenever the CREATE TRIGGER keywords are seen, the statement
** must end with ";END;".
**
** Let the return code be a value R. R is split up into various
** subfields, at byte boundaries:
**
** R = 0xwwwwwwww00xxyyzz
**
** In other words, zz is the least significant byte, yy is the next
** most significant byte, xx is the third byte, wwwwwwww is the upper
** four bytes of the return value.
**
** zz == SQLITE_OK Input is complete
** zz == SQLITE_ERROR Input is incomplete
** zz == SQLITE_EMPTY Input contains only whitespace
** zz == SQLITE_MISUSE Input is a NULL pointer
** zz != 0 New values for zz may be added in the future
**
** yy == 0x01 Need a semicolon at the end
** yy == 0x02 Need "END" and a semicolon
** yy == 0x03 Need semicolon, "END", and semicolon
** yy != 0 New values for yy may be added in the future
**
** xx == '\'' Incomplete string or blob literal
** xx == '"' Incomplete quoted identifier
** xx == '`' Incompelte MySQL-style quoted identifier
** xx == ']' Incomplete SQLServer-style quoted identifer
** xx == '-' Incomplete SQL-style comment
** xx == '/' Incomplete C-style comment
** xx != 0 New values of xx may be added in the future
**
** wwwwwwww Interpret as a signed integer, the number
** of unmatched "(". Negative means there are
** more ")" and "(".
**
** ((R>>24)&0xff)!=0 New uses for the 4th byte may be added
** in the future
**
** This implementation uses a state machine with 8 states:
**
** (0) NOTHING We have not yet seen a non-whitespace character.
**
** (1) START At the beginning or end of an SQL statement. This routine
** returns 1 if it ends in the START state and 0 if it ends
** in any other state.
**
** (2) NORMAL We are in the middle of statement which ends with a single
** semicolon.
**
** (3) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
** a statement.
**
** (4) CREATE The keyword CREATE has been seen at the beginning of a
** statement, possibly preceded by EXPLAIN and/or followed by
** TEMP or TEMPORARY
**
** (5) TRIGGER We are in the middle of a trigger definition that must be
** ended by a semicolon, the keyword END, and another semicolon.
**
** (6) SEMI We've seen the first semicolon in the ";END;" that occurs at
** the end of a trigger definition.
**
** (7) END We've seen the ";END" of the ";END;" that occurs at the end
** of a trigger definition.
**
** Transitions between states above are determined by tokens extracted
** from the input. The following tokens are significant:
**
** (0) tkSEMI A semicolon.
** (1) tkWS Whitespace.
** (2) tkOTHER Any other SQL token.
** (3) tkEXPLAIN The "explain" keyword.
** (4) tkCREATE The "create" keyword.
** (5) tkTEMP The "temp" or "temporary" keyword.
** (6) tkTRIGGER The "trigger" keyword.
** (7) tkEND The "end" keyword.
**
** Whitespace never causes a state transition and is always ignored.
** This means that a SQL string of all whitespace is invalid.
**
** If we compile with SQLITE_OMIT_TRIGGER, all of the computation needed
** to recognize the end of a trigger can be omitted. All we have to do
** is look for a semicolon that is not part of an string or comment.
*/
sqlite3_int64 sqlite3_incomplete(const char *zSql){
u8 state = 0; /* Current state, using numbers defined in header comment */
u8 token; /* Value of the next token */
u8 pending = 0; /* unmatched structure character */
int nParen = 0; /* Nested parentheses */
#ifndef SQLITE_OMIT_TRIGGER
/* A complex statement machine used to detect the end of a CREATE TRIGGER
** statement. This is the normal case.
*/
static const u8 trans[8][8] = {
/* Token: */
/* State: ** SEMI WS OTHER EXPLAIN CREATE TEMP TRIGGER END */
/* 0 NOTHING: */ { 1, 0, 2, 3, 4, 2, 2, 2, },
/* 1 START: */ { 1, 1, 2, 3, 4, 2, 2, 2, },
/* 2 NORMAL: */ { 1, 2, 2, 2, 2, 2, 2, 2, },
/* 3 EXPLAIN: */ { 1, 3, 3, 2, 4, 2, 2, 2, },
/* 4 CREATE: */ { 1, 4, 2, 2, 2, 4, 5, 2, },
/* 5 TRIGGER: */ { 6, 5, 5, 5, 5, 5, 5, 5, },
/* 6 SEMI: */ { 6, 6, 5, 5, 5, 5, 5, 7, },
/* 7 END: */ { 1, 7, 5, 5, 5, 5, 5, 5, },
};
#else
/* If triggers are not supported by this compile then the statement machine
** used to detect the end of a statement is much simpler
*/
static const u8 trans[3][3] = {
/* Token: */
/* State: ** SEMI WS OTHER */
/* 0 NOTHING: */ { 1, 0, 2, },
/* 1 START: */ { 1, 1, 2, },
/* 2 NORMAL: */ { 1, 2, 2, },
};
#endif /* SQLITE_OMIT_TRIGGER */
/* Mapping state number to yy value for the return */
static const u8 statemap[8] = {
/* 0 NOTHING */ 0,
/* 1 START */ 0,
/* 2 NORMAL */ 1,
/* 3 EXPLAIN */ 1,
/* 4 CREATE */ 1,
/* 5 TRIGGER */ 3,
/* 6 SEMI */ 2,
/* 7 END */ 1,
};
#ifdef SQLITE_ENABLE_API_ARMOR
if( zSql==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
while( *zSql ){
switch( *zSql ){
case ';': { /* A semicolon */
token = tkSEMI;
break;
}
case ' ':
case '\r':
case '\t':
case '\n':
case '\f': { /* White space is ignored */
token = tkWS;
break;
}
case '/': { /* C-style comments */
if( zSql[1]!='*' ){
token = tkOTHER;
break;
}
zSql += 2;
while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; }
if( zSql[0]==0 ){
pending = '/';
goto incomplete_finish;
}
zSql++;
token = tkWS;
break;
}
case '-': { /* SQL-style comments from "--" to end of line */
if( zSql[1]!='-' ){
token = tkOTHER;
break;
}
while( *zSql && *zSql!='\n' ){ zSql++; }
if( *zSql==0 ){
pending = '-';
goto incomplete_finish;
}
token = tkWS;
break;
}
case '[': { /* Microsoft-style identifiers in [...] */
zSql++;
while( *zSql && *zSql!=']' ){ zSql++; }
if( *zSql==0 ){
pending = ']';
goto incomplete_finish;
}
token = tkOTHER;
break;
}
case '`': /* Grave-accent quoted symbols used by MySQL */
case '"': /* single- and double-quoted strings */
case '\'': {
int c = *zSql;
zSql++;
while( *zSql && *zSql!=c ){ zSql++; }
if( *zSql==0 ){
pending = c;
goto incomplete_finish;
}
token = tkOTHER;
break;
}
case '(': {
nParen++;
token = tkOTHER;
break;
}
case ')': {
nParen--;
token = tkOTHER;
break;
}
default: {
#ifdef SQLITE_EBCDIC
unsigned char c;
#endif
if( IdChar((u8)*zSql) ){
/* Keywords and unquoted identifiers */
int nId;
for(nId=1; IdChar(zSql[nId]); nId++){}
#ifdef SQLITE_OMIT_TRIGGER
token = tkOTHER;
#else
switch( *zSql ){
case 'c': case 'C': {
if( nId==6 && sqlite3StrNICmp(zSql, "create", 6)==0 ){
token = tkCREATE;
}else{
token = tkOTHER;
}
break;
}
case 't': case 'T': {
if( nId==7 && sqlite3StrNICmp(zSql, "trigger", 7)==0 ){
token = tkTRIGGER;
}else if( nId==4 && sqlite3StrNICmp(zSql, "temp", 4)==0 ){
token = tkTEMP;
}else if( nId==9 && sqlite3StrNICmp(zSql, "temporary", 9)==0 ){
token = tkTEMP;
}else{
token = tkOTHER;
}
break;
}
case 'e': case 'E': {
if( nId==3 && sqlite3StrNICmp(zSql, "end", 3)==0 ){
token = tkEND;
}else
#ifndef SQLITE_OMIT_EXPLAIN
if( nId==7 && sqlite3StrNICmp(zSql, "explain", 7)==0 ){
token = tkEXPLAIN;
}else
#endif
{
token = tkOTHER;
}
break;
}
default: {
token = tkOTHER;
break;
}
}
#endif /* SQLITE_OMIT_TRIGGER */
zSql += nId-1;
}else{
/* Operators and special symbols */
token = tkOTHER;
}
break;
}
}
state = trans[state][token];
zSql++;
}
incomplete_finish:
if( state==0 && pending==0 ) return SQLITE_EMPTY;
if( state==1 ) nParen = 0;
return (i64)((((u64)nParen)<<32) |
((u64)pending<<16) |
((u64)statemap[state]<<8) |
(state>1 || pending!=0));
}
int sqlite3_complete(const char *zSql){
return sqlite3_incomplete(zSql)==0;
}
#ifndef SQLITE_OMIT_UTF16
/*
** This routine is the same as the sqlite3_complete() routine described
** above, except that the parameter is required to be UTF-16 encoded, not
** UTF-8.
*/
int sqlite3_complete16(const void *zSql){
sqlite3_value *pVal;
char const *zSql8;
int rc;
#ifndef SQLITE_OMIT_AUTOINIT
rc = sqlite3_initialize();
if( rc ) return rc;
#endif
pVal = sqlite3ValueNew(0);
sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
if( zSql8 ){
rc = sqlite3_incomplete(zSql8)==0;
}else{
rc = SQLITE_NOMEM_BKPT;
}
sqlite3ValueFree(pVal);
return rc & 0xff;
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_COMPLETE */