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-rw-r--r--src/expr.c72
1 files changed, 28 insertions, 44 deletions
diff --git a/src/expr.c b/src/expr.c
index 0aaaf0e87..b2ec92e2e 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -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 1.81 2002/09/08 00:04:52 drh Exp $
+** $Id: expr.c,v 1.82 2002/10/22 23:38:04 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -36,34 +36,33 @@ Expr *sqliteExpr(int op, Expr *pLeft, Expr *pRight, Token *pToken){
if( pToken ){
assert( pToken->dyn==0 );
pNew->token = *pToken;
- pNew->token.base = 1;
- }else if( pLeft && pRight ){
- sqliteExprSpan(pNew, &pLeft->token, &pRight->token);
+ pNew->span = *pToken;
}else{
pNew->token.dyn = 0;
- pNew->token.base = 1;
pNew->token.z = 0;
pNew->token.n = 0;
+ if( pLeft && pRight ){
+ sqliteExprSpan(pNew, &pLeft->span, &pRight->span);
+ }else{
+ pNew->span = pNew->token;
+ }
}
return pNew;
}
/*
-** Set the Expr.token field of the given expression to span all
+** Set the Expr.span field of the given expression to span all
** text between the two given tokens.
*/
void sqliteExprSpan(Expr *pExpr, Token *pLeft, Token *pRight){
- if( pExpr ){
- assert( pExpr->token.dyn==0 );
+ if( pExpr && pRight && pRight->z && pLeft && pLeft->z ){
if( pLeft->dyn==0 && pRight->dyn==0 ){
- pExpr->token.z = pLeft->z;
- pExpr->token.n = pRight->n + Addr(pRight->z) - Addr(pLeft->z);
- pExpr->token.base = 0;
+ pExpr->span.z = pLeft->z;
+ pExpr->span.n = pRight->n + Addr(pRight->z) - Addr(pLeft->z);
}else{
- pExpr->token.z = 0;
- pExpr->token.n = 0;
- pExpr->token.dyn = 0;
- pExpr->token.base = 0;
+ pExpr->span.z = 0;
+ pExpr->span.n = 0;
+ pExpr->span.dyn = 0;
}
}
}
@@ -81,22 +80,15 @@ Expr *sqliteExprFunction(ExprList *pList, Token *pToken){
}
pNew->op = TK_FUNCTION;
pNew->pList = pList;
-
- /* Expr.token.n is the length of the entire function
- ** call, including the function arguments. The parser
- ** will extend token.n to cover the either length of the string.
- ** Expr.nFuncName is the length of just the function name.
- */
pNew->token.dyn = 0;
- pNew->token.base = 1;
if( pToken ){
assert( pToken->dyn==0 );
pNew->token = *pToken;
- pNew->nFuncName = pToken->n>255 ? 255 : pToken->n;
}else{
pNew->token.z = 0;
pNew->token.n = 0;
}
+ pNew->span = pNew->token;
return pNew;
}
@@ -105,6 +97,7 @@ Expr *sqliteExprFunction(ExprList *pList, Token *pToken){
*/
void sqliteExprDelete(Expr *p){
if( p==0 ) return;
+ if( p->span.dyn && p->span.z ) sqliteFree((char*)p->span.z);
if( p->token.dyn && p->token.z ) sqliteFree((char*)p->token.z);
if( p->pLeft ) sqliteExprDelete(p->pLeft);
if( p->pRight ) sqliteExprDelete(p->pRight);
@@ -132,12 +125,7 @@ Expr *sqliteExprDup(Expr *p){
pNew = sqliteMalloc( sizeof(*p) );
if( pNew==0 ) return 0;
memcpy(pNew, p, sizeof(*pNew));
- /* Only make a copy of the token if it is a base token (meaning that
- ** it covers a single term of an expression - not two or more terms)
- ** or if it is already dynamically allocated. So, for example, in
- ** a complex expression like "a+b+c", the token "b" would be duplicated
- ** but "a+b" would not be. */
- if( p->token.z!=0 && (p->token.base || p->token.dyn) ){
+ if( p->token.z!=0 ){
pNew->token.z = sqliteStrDup(p->token.z);
pNew->token.dyn = 1;
}else{
@@ -145,6 +133,9 @@ Expr *sqliteExprDup(Expr *p){
pNew->token.n = 0;
pNew->token.dyn = 0;
}
+ pNew->span.z = 0;
+ pNew->span.n = 0;
+ pNew->span.dyn = 0;
pNew->pLeft = sqliteExprDup(p->pLeft);
pNew->pRight = sqliteExprDup(p->pRight);
pNew->pList = sqliteExprListDup(p->pList);
@@ -153,7 +144,6 @@ Expr *sqliteExprDup(Expr *p){
}
void sqliteTokenCopy(Token *pTo, Token *pFrom){
if( pTo->dyn ) sqliteFree((char*)pTo->z);
- pTo->base = pFrom->base;
if( pFrom->z ){
pTo->n = pFrom->n;
pTo->z = sqliteStrNDup(pFrom->z, pFrom->n);
@@ -176,12 +166,13 @@ ExprList *sqliteExprListDup(ExprList *p){
for(i=0; i<p->nExpr; i++){
Expr *pNewExpr, *pOldExpr;
pNew->a[i].pExpr = pNewExpr = sqliteExprDup(pOldExpr = p->a[i].pExpr);
- if( pOldExpr->token.z!=0 && pNewExpr && pNewExpr->token.z==0 ){
- /* Always make a copy of the token for top-level expressions in the
+ if( pOldExpr->span.z!=0 && pNewExpr ){
+ /* Always make a copy of the span for top-level expressions in the
** expression list. The logic in SELECT processing that determines
** the names of columns in the result set needs this information */
- sqliteTokenCopy(&pNew->a[i].pExpr->token, &p->a[i].pExpr->token);
+ sqliteTokenCopy(&pNewExpr->span, &pOldExpr->span);
}
+ assert( pNewExpr==0 || pNewExpr->span.z!=0 || pOldExpr->span.z==0 );
pNew->a[i].zName = sqliteStrDup(p->a[i].zName);
pNew->a[i].sortOrder = p->a[i].sortOrder;
pNew->a[i].isAgg = p->a[i].isAgg;
@@ -714,7 +705,7 @@ static void getFunctionName(Expr *pExpr, const char **pzName, int *pnName){
switch( pExpr->op ){
case TK_FUNCTION: {
*pzName = pExpr->token.z;
- *pnName = pExpr->nFuncName;
+ *pnName = pExpr->token.n;
break;
}
case TK_LIKE: {
@@ -1451,16 +1442,9 @@ int sqliteExprCompare(Expr *pA, Expr *pB){
if( pA->pSelect || pB->pSelect ) return 0;
if( pA->iTable!=pB->iTable || pA->iColumn!=pB->iColumn ) return 0;
if( pA->token.z ){
- int n;
if( pB->token.z==0 ) return 0;
- if( pA->op==TK_FUNCTION || pA->op==TK_AGG_FUNCTION ){
- n = pA->nFuncName;
- if( pB->nFuncName!=n ) return 0;
- }else{
- n = pA->token.n;
- if( pB->token.n!=n ) return 0;
- }
- if( sqliteStrNICmp(pA->token.z, pB->token.z, n)!=0 ) return 0;
+ if( pB->token.n!=pA->token.n ) return 0;
+ if( sqliteStrNICmp(pA->token.z, pB->token.z, pB->token.n)!=0 ) return 0;
}
return 1;
}
@@ -1531,7 +1515,7 @@ int sqliteExprAnalyzeAggregates(Parse *pParse, Expr *pExpr){
pParse->aAgg[i].isAgg = 1;
pParse->aAgg[i].pExpr = pExpr;
pParse->aAgg[i].pFunc = sqliteFindFunction(pParse->db,
- pExpr->token.z, pExpr->nFuncName,
+ pExpr->token.z, pExpr->token.n,
pExpr->pList ? pExpr->pList->nExpr : 0, 0);
}
pExpr->iAgg = i;
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-20 21:05:44 +0000