264 lines
8.3 KiB
C
264 lines
8.3 KiB
C
/*
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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 implements the sqlite3_complete() API.
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** This code used to be part of the tokenizer.c source file. But by
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** separating it out, the code will be automatically omitted from
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** static links that do not use it.
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**
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** $Id$
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*/
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#include "sqliteInt.h"
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#ifndef SQLITE_OMIT_COMPLETE
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/*
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** This is defined in tokenize.c. We just have to import the definition.
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*/
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extern const char sqlite3IsIdChar[];
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#define IdChar(C) (((c=C)&0x80)!=0 || (c>0x1f && sqlite3IsIdChar[c-0x20]))
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/*
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** Token types used by the sqlite3_complete() routine. See the header
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** comments on that procedure for additional information.
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*/
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#define tkSEMI 0
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#define tkWS 1
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#define tkOTHER 2
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#define tkEXPLAIN 3
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#define tkCREATE 4
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#define tkTEMP 5
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#define tkTRIGGER 6
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#define tkEND 7
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/*
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** Return TRUE if the given SQL string ends in a semicolon.
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**
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** Special handling is require for CREATE TRIGGER statements.
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** Whenever the CREATE TRIGGER keywords are seen, the statement
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** must end with ";END;".
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**
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** This implementation uses a state machine with 7 states:
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**
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** (0) START At the beginning or end of an SQL statement. This routine
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** returns 1 if it ends in the START state and 0 if it ends
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** in any other state.
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**
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** (1) NORMAL We are in the middle of statement which ends with a single
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** semicolon.
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**
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** (2) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
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** a statement.
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**
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** (3) CREATE The keyword CREATE has been seen at the beginning of a
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** statement, possibly preceeded by EXPLAIN and/or followed by
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** TEMP or TEMPORARY
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**
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** (4) TRIGGER We are in the middle of a trigger definition that must be
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** ended by a semicolon, the keyword END, and another semicolon.
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**
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** (5) SEMI We've seen the first semicolon in the ";END;" that occurs at
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** the end of a trigger definition.
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**
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** (6) END We've seen the ";END" of the ";END;" that occurs at the end
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** of a trigger difinition.
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**
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** Transitions between states above are determined by tokens extracted
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** from the input. The following tokens are significant:
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**
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** (0) tkSEMI A semicolon.
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** (1) tkWS Whitespace
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** (2) tkOTHER Any other SQL token.
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** (3) tkEXPLAIN The "explain" keyword.
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** (4) tkCREATE The "create" keyword.
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** (5) tkTEMP The "temp" or "temporary" keyword.
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** (6) tkTRIGGER The "trigger" keyword.
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** (7) tkEND The "end" keyword.
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**
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** Whitespace never causes a state transition and is always ignored.
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**
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** If we compile with SQLITE_OMIT_TRIGGER, all of the computation needed
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** to recognize the end of a trigger can be omitted. All we have to do
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** is look for a semicolon that is not part of an string or comment.
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*/
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int sqlite3_complete(const char *zSql){
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u8 state = 0; /* Current state, using numbers defined in header comment */
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u8 token; /* Value of the next token */
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#ifndef SQLITE_OMIT_TRIGGER
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/* A complex statement machine used to detect the end of a CREATE TRIGGER
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** statement. This is the normal case.
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*/
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static const u8 trans[7][8] = {
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/* Token: */
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/* State: ** SEMI WS OTHER EXPLAIN CREATE TEMP TRIGGER END */
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/* 0 START: */ { 0, 0, 1, 2, 3, 1, 1, 1, },
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/* 1 NORMAL: */ { 0, 1, 1, 1, 1, 1, 1, 1, },
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/* 2 EXPLAIN: */ { 0, 2, 1, 1, 3, 1, 1, 1, },
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/* 3 CREATE: */ { 0, 3, 1, 1, 1, 3, 4, 1, },
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/* 4 TRIGGER: */ { 5, 4, 4, 4, 4, 4, 4, 4, },
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/* 5 SEMI: */ { 5, 5, 4, 4, 4, 4, 4, 6, },
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/* 6 END: */ { 0, 6, 4, 4, 4, 4, 4, 4, },
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};
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#else
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/* If triggers are not suppored by this compile then the statement machine
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** used to detect the end of a statement is much simplier
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*/
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static const u8 trans[2][3] = {
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/* Token: */
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/* State: ** SEMI WS OTHER */
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/* 0 START: */ { 0, 0, 1, },
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/* 1 NORMAL: */ { 0, 1, 1, },
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};
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#endif /* SQLITE_OMIT_TRIGGER */
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while( *zSql ){
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switch( *zSql ){
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case ';': { /* A semicolon */
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token = tkSEMI;
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break;
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}
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case ' ':
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case '\r':
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case '\t':
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case '\n':
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case '\f': { /* White space is ignored */
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token = tkWS;
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break;
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}
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case '/': { /* C-style comments */
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if( zSql[1]!='*' ){
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token = tkOTHER;
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break;
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}
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zSql += 2;
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while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; }
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if( zSql[0]==0 ) return 0;
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zSql++;
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token = tkWS;
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break;
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}
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case '-': { /* SQL-style comments from "--" to end of line */
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if( zSql[1]!='-' ){
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token = tkOTHER;
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break;
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}
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while( *zSql && *zSql!='\n' ){ zSql++; }
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if( *zSql==0 ) return state==0;
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token = tkWS;
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break;
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}
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case '[': { /* Microsoft-style identifiers in [...] */
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zSql++;
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while( *zSql && *zSql!=']' ){ zSql++; }
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if( *zSql==0 ) return 0;
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token = tkOTHER;
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break;
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}
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case '`': /* Grave-accent quoted symbols used by MySQL */
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case '"': /* single- and double-quoted strings */
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case '\'': {
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int c = *zSql;
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zSql++;
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while( *zSql && *zSql!=c ){ zSql++; }
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if( *zSql==0 ) return 0;
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token = tkOTHER;
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break;
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}
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default: {
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int c;
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if( IdChar((u8)*zSql) ){
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/* Keywords and unquoted identifiers */
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int nId;
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for(nId=1; IdChar(zSql[nId]); nId++){}
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#ifdef SQLITE_OMIT_TRIGGER
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token = tkOTHER;
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#else
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switch( *zSql ){
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case 'c': case 'C': {
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if( nId==6 && sqlite3StrNICmp(zSql, "create", 6)==0 ){
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token = tkCREATE;
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}else{
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token = tkOTHER;
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}
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break;
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}
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case 't': case 'T': {
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if( nId==7 && sqlite3StrNICmp(zSql, "trigger", 7)==0 ){
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token = tkTRIGGER;
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}else if( nId==4 && sqlite3StrNICmp(zSql, "temp", 4)==0 ){
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token = tkTEMP;
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}else if( nId==9 && sqlite3StrNICmp(zSql, "temporary", 9)==0 ){
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token = tkTEMP;
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}else{
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token = tkOTHER;
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}
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break;
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}
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case 'e': case 'E': {
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if( nId==3 && sqlite3StrNICmp(zSql, "end", 3)==0 ){
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token = tkEND;
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}else
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#ifndef SQLITE_OMIT_EXPLAIN
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if( nId==7 && sqlite3StrNICmp(zSql, "explain", 7)==0 ){
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token = tkEXPLAIN;
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}else
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#endif
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{
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token = tkOTHER;
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}
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break;
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}
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default: {
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token = tkOTHER;
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break;
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}
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}
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#endif /* SQLITE_OMIT_TRIGGER */
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zSql += nId-1;
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}else{
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/* Operators and special symbols */
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token = tkOTHER;
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}
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break;
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}
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}
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state = trans[state][token];
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zSql++;
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}
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return state==0;
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}
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#ifndef SQLITE_OMIT_UTF16
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/*
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** This routine is the same as the sqlite3_complete() routine described
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** above, except that the parameter is required to be UTF-16 encoded, not
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** UTF-8.
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*/
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int sqlite3_complete16(const void *zSql){
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sqlite3_value *pVal;
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char const *zSql8;
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int rc = 0;
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pVal = sqlite3ValueNew();
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sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
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zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
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if( zSql8 ){
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rc = sqlite3_complete(zSql8);
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}
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sqlite3ValueFree(pVal);
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return sqlite3ApiExit(0, rc);
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}
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#endif /* SQLITE_OMIT_UTF16 */
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#endif /* SQLITE_OMIT_COMPLETE */
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