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Added support for CASE expressions - patches from Dan Kennedy. (CVS 437)

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FossilOrigin-Name: 836b59d057c3fb4087b138c9bfbc03392ddfb89d
This commit is contained in:
drh
2002-03-24 13:13:27 +00:00
parent 6b54e74cf4
commit 17a7f8ddab
7 changed files with 100 additions and 18 deletions
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45
src/expr.c
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@@ -12,7 +12,7 @@
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.56 2002/03/13 18:54:07 drh Exp $
** $Id: expr.c,v 1.57 2002/03/24 13:13:29 drh Exp $
*/
#include "sqliteInt.h"
@@ -877,8 +877,49 @@ void sqliteExprCode(Parse *pParse, Expr *pExpr){
sqliteExprCode(pParse, pExpr->pLeft);
break;
}
case TK_CASE: {
int expr_end_label;
int next_when_label;
int i;
assert(pExpr->pList);
assert((pExpr->pList->nExpr % 2) == 0);
assert(pExpr->pList->nExpr > 0);
expr_end_label = sqliteVdbeMakeLabel(pParse->pVdbe);
if( pExpr->pLeft ){
sqliteExprCode(pParse, pExpr->pLeft);
}
for(i=0; i<pExpr->pList->nExpr; i=i+2){
if( i!=0 ){
sqliteVdbeResolveLabel(pParse->pVdbe, next_when_label);
}
next_when_label = sqliteVdbeMakeLabel(pParse->pVdbe);
if( pExpr->pLeft ){
sqliteVdbeAddOp(pParse->pVdbe, OP_Dup, 0, 1);
sqliteExprCode(pParse, pExpr->pList->a[i].pExpr);
sqliteVdbeAddOp(pParse->pVdbe, OP_Ne, 0, next_when_label);
}else{
sqliteExprIfFalse(pParse, pExpr->pList->a[i].pExpr, next_when_label);
}
if( pExpr->pLeft ){
sqliteVdbeAddOp(pParse->pVdbe, OP_Pop, 1, 0);
}
sqliteExprCode(pParse, pExpr->pList->a[i+1].pExpr);
sqliteVdbeAddOp(pParse->pVdbe, OP_Goto, 0, expr_end_label);
}
sqliteVdbeResolveLabel(pParse->pVdbe, next_when_label);
if( pExpr->pLeft ){
sqliteVdbeAddOp(pParse->pVdbe, OP_Pop, 1, 0);
}
if( pExpr->pRight ){
sqliteExprCode(pParse, pExpr->pRight);
}else{
sqliteVdbeAddOp(pParse->pVdbe, OP_String, 0, 0);
}
sqliteVdbeResolveLabel(pParse->pVdbe, expr_end_label);
}
break;
}
return;
}
/*