SQLite

**     CREATE INDEX
**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**
** $Id: build.c,v 1.391 2006/03/13 12:54:10 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Initialize the pParse structure as needed.

  db = pParse->db;
  if( pParse->cookieGoto==0 ){
    pParse->cookieGoto = sqlite3VdbeAddOp(v, OP_Goto, 0, 0)+1;
  }
  if( iDb>=0 ){
    assert( iDb<db->nDb );
    assert( db->aDb[iDb].pBt!=0 || iDb==1 );
    assert( iDb<MAX_ATTACHED+2 );
    mask = 1<<iDb;
    if( (pParse->cookieMask & mask)==0 ){
      pParse->cookieMask |= mask;
      pParse->cookieValue[iDb] = db->aDb[iDb].pSchema->schema_cookie;
      if( !OMIT_TEMPDB && iDb==1 ){
        sqlite3OpenTempDatabase(pParse);
      }

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.199 2006/03/13 12:54:10 drh Exp $
*/

// All token codes are small integers with #defines that begin with "TK_"
%token_prefix TK_

// The type of the data attached to each token is Token.  This is also the
// default type for non-terminals.

  A = sqlite3Expr(TK_CAST, E, 0, &T);
  sqlite3ExprSpan(A,&X,&Y);
}
%endif // SQLITE_OMIT_CAST
expr(A) ::= ID(X) LP distinct(D) exprlist(Y) RP(E). {
  A = sqlite3ExprFunction(Y, &X);
  sqlite3ExprSpan(A,&X,&E);
  if( D && A ){
    A->flags |= EP_Distinct;
  }
}
expr(A) ::= ID(X) LP STAR RP(E). {
  A = sqlite3ExprFunction(0, &X);
  sqlite3ExprSpan(A,&X,&E);
}

likeop(A) ::= LIKE_KW(X).     {A.eOperator = X; A.not = 0;}
likeop(A) ::= NOT LIKE_KW(X). {A.eOperator = X; A.not = 1;}
%type escape {Expr*}
%destructor escape {sqlite3ExprDelete($$);}
escape(X) ::= ESCAPE expr(A). [ESCAPE] {X = A;}
escape(X) ::= .               [ESCAPE] {X = 0;}
expr(A) ::= expr(X) likeop(OP) expr(Y) escape(E).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(0, Y, 0);
  pList = sqlite3ExprListAppend(pList, X, 0);
  if( E ){
    pList = sqlite3ExprListAppend(pList, E, 0);
  }
  A = sqlite3ExprFunction(pList, &OP.eOperator);
  if( OP.not ) A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A, &X->span, &Y->span);

// SELECT
trigger_cmd(A) ::= select(X).  {A = sqlite3TriggerSelectStep(X); }

// The special RAISE expression that may occur in trigger programs
expr(A) ::= RAISE(X) LP IGNORE RP(Y).  {
  A = sqlite3Expr(TK_RAISE, 0, 0, 0); 
  if( A ){
    A->iColumn = OE_Ignore;
    sqlite3ExprSpan(A, &X, &Y);
  }
}
expr(A) ::= RAISE(X) LP raisetype(T) COMMA nm(Z) RP(Y).  {
  A = sqlite3Expr(TK_RAISE, 0, 0, &Z); 
  if( A ) {
    A->iColumn = T;
    sqlite3ExprSpan(A, &X, &Y);
  }
}
%endif // !SQLITE_OMIT_TRIGGER

%type raisetype {int}
raisetype(A) ::= ROLLBACK.  {A = OE_Rollback;}
raisetype(A) ::= ABORT.     {A = OE_Abort;}
raisetype(A) ::= FAIL.      {A = OE_Fail;}

/*
** Change the value of the P1 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqlite3VdbeAddOpList but we want to make a
** few minor changes to the program.
*/
void sqlite3VdbeChangeP1(Vdbe *p, int addr, int val){
  assert( p==0 || p->magic==VDBE_MAGIC_INIT );
  if( p && addr>=0 && p->nOp>addr && p->aOp ){
    p->aOp[addr].p1 = val;
  }
}

/*
** Change the value of the P2 operand for a specific instruction.
** This routine is useful for setting a jump destination.
*/
void sqlite3VdbeChangeP2(Vdbe *p, int addr, int val){
  assert( val>=0 );
  assert( p==0 || p->magic==VDBE_MAGIC_INIT );
  if( p && addr>=0 && p->nOp>addr && p->aOp ){
    p->aOp[addr].p2 = val;
  }
}

/*
** Change teh P2 operand of instruction addr so that it points to

** to a string or structure that is guaranteed to exist for the lifetime of
** the Vdbe. In these cases we can just copy the pointer.
**
** If addr<0 then change P3 on the most recently inserted instruction.
*/
void sqlite3VdbeChangeP3(Vdbe *p, int addr, const char *zP3, int n){
  Op *pOp;
  assert( p==0 || p->magic==VDBE_MAGIC_INIT );
  if( p==0 || p->aOp==0 || sqlite3MallocFailed() ){
    if (n != P3_KEYINFO) {
      freeP3(n, (void*)*(char**)&zP3);
    }
    return;
  }
  if( addr<0 || addr>=p->nOp ){