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Added length() and substr() functions (CVS 143)

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FossilOrigin-Name: 0eef538f3de66fede7c88f8be8c3458d84107c3f
This commit is contained in:
drh
2000-08-28 15:51:43 +00:00
parent 3d441f8082
commit 6ec2733b44
6 changed files with 150 additions and 24 deletions
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55
src/expr.c
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@@ -24,7 +24,7 @@
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions.
**
** $Id: expr.c,v 1.18 2000/06/21 13:59:11 drh Exp $
** $Id: expr.c,v 1.19 2000/08/28 15:51:44 drh Exp $
*/
#include "sqliteInt.h"
@@ -323,6 +323,8 @@ int sqliteFuncId(Token *pToken){
{ "sum", 3, FN_Sum },
{ "avg", 3, FN_Avg },
{ "fcnt", 4, FN_Fcnt }, /* Used for testing only */
{ "length", 6, FN_Length},
{ "substr", 6, FN_Substr},
};
int i;
for(i=0; i<ArraySize(aFunc); i++){
@@ -381,6 +383,16 @@ int sqliteExprCheck(Parse *pParse, Expr *pExpr, int allowAgg, int *pIsAgg){
is_agg = 1;
break;
}
case FN_Length: {
too_few_args = n<1;
too_many_args = n>1;
break;
}
case FN_Substr: {
too_few_args = n<3;
too_many_args = n>3;
break;
}
/* The "fcnt(*)" function always returns the number of fetch
** operations that have occurred so far while processing the
** SQL statement. This information can be used by test procedures
@@ -392,6 +404,7 @@ int sqliteExprCheck(Parse *pParse, Expr *pExpr, int allowAgg, int *pIsAgg){
n = 0;
break;
}
default: break;
}
if( no_such_func ){
@@ -574,15 +587,37 @@ void sqliteExprCode(Parse *pParse, Expr *pExpr){
int op;
int i;
ExprList *pList = pExpr->pList;
if( id==FN_Fcnt ){
sqliteVdbeAddOp(v, OP_Fcnt, 0, 0, 0, 0);
break;
}
op = id==FN_Min ? OP_Min : OP_Max;
for(i=0; i<pList->nExpr; i++){
sqliteExprCode(pParse, pList->a[i].pExpr);
if( i>0 ){
sqliteVdbeAddOp(v, op, 0, 0, 0, 0);
switch( id ){
case FN_Fcnt: {
sqliteVdbeAddOp(v, OP_Fcnt, 0, 0, 0, 0);
break;
}
case FN_Min:
case FN_Max: {
op = id==FN_Min ? OP_Min : OP_Max;
for(i=0; i<pList->nExpr; i++){
sqliteExprCode(pParse, pList->a[i].pExpr);
if( i>0 ){
sqliteVdbeAddOp(v, op, 0, 0, 0, 0);
}
}
break;
}
case FN_Length: {
sqliteExprCode(pParse, pList->a[0].pExpr);
sqliteVdbeAddOp(v, OP_Strlen, 0, 0, 0, 0);
break;
}
case FN_Substr: {
for(i=0; i<pList->nExpr; i++){
sqliteExprCode(pParse, pList->a[i].pExpr);
}
sqliteVdbeAddOp(v, OP_Substr, 0, 0, 0, 0);
break;
}
default: {
/* Can't happen! */
break;
}
}
break;