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Code review for XML patch. Instill a bit of sanity in the location of

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the XmlExpr code in various lists, use a representation that has some hope
of reverse-listing correctly (though it's still a de-escaping function
shy of correctness), generally try to make it look more like Postgres
coding conventions.
This commit is contained in:
Tom Lane
2006-12-24 00:29:20 +00:00
parent 64974613c9
commit c957c0bac7
27 changed files with 883 additions and 686 deletions
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167
src/backend/parser/parse_expr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.201 2006/12/23 00:43:11 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.202 2006/12/24 00:29:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -220,6 +220,10 @@ transformExpr(ParseState *pstate, Node *expr)
result = transformMinMaxExpr(pstate, (MinMaxExpr *) expr);
break;
case T_XmlExpr:
result = transformXmlExpr(pstate, (XmlExpr *) expr);
break;
case T_NullTest:
{
NullTest *n = (NullTest *) expr;
@ -234,10 +238,6 @@ transformExpr(ParseState *pstate, Node *expr)
result = transformBooleanTest(pstate, (BooleanTest *) expr);
break;
case T_XmlExpr:
result = transformXmlExpr(pstate, (XmlExpr *) expr);
break;
/*********************************************
* Quietly accept node types that may be presented when we are
* called on an already-transformed tree.
@ -1375,6 +1375,107 @@ transformMinMaxExpr(ParseState *pstate, MinMaxExpr *m)
return (Node *) newm;
}
static Node *
transformXmlExpr(ParseState *pstate, XmlExpr *x)
{
XmlExpr *newx = makeNode(XmlExpr);
ListCell *lc;
int i;
newx->op = x->op;
if (x->name)
newx->name = map_sql_identifier_to_xml_name(x->name, false);
else
newx->name = NULL;
/*
* gram.y built the named args as a list of ResTarget. Transform each,
* and break the names out as a separate list.
*/
newx->named_args = NIL;
newx->arg_names = NIL;
foreach(lc, x->named_args)
{
ResTarget *r = (ResTarget *) lfirst(lc);
Node *expr;
char *argname;
Assert(IsA(r, ResTarget));
expr = transformExpr(pstate, r->val);
if (r->name)
argname = map_sql_identifier_to_xml_name(r->name, false);
else if (IsA(r->val, ColumnRef))
argname = map_sql_identifier_to_xml_name(FigureColname(r->val),
true);
else
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
x->op == IS_XMLELEMENT
? errmsg("unnamed attribute value must be a column reference")
: errmsg("unnamed element value must be a column reference")));
argname = NULL; /* keep compiler quiet */
}
newx->named_args = lappend(newx->named_args, expr);
newx->arg_names = lappend(newx->arg_names, makeString(argname));
}
/* The other arguments are of varying types depending on the function */
newx->args = NIL;
i = 0;
foreach(lc, x->args)
{
Node *e = (Node *) lfirst(lc);
Node *newe;
newe = transformExpr(pstate, e);
switch (x->op)
{
case IS_XMLCONCAT:
newe = coerce_to_specific_type(pstate, newe, XMLOID,
"XMLCONCAT");
break;
case IS_XMLELEMENT:
newe = coerce_to_specific_type(pstate, newe, XMLOID,
"XMLELEMENT");
break;
case IS_XMLFOREST:
newe = coerce_to_specific_type(pstate, newe, XMLOID,
"XMLFOREST");
break;
case IS_XMLPARSE:
if (i == 0)
newe = coerce_to_specific_type(pstate, newe, TEXTOID,
"XMLPARSE");
else
newe = coerce_to_boolean(pstate, newe, "XMLPARSE");
break;
case IS_XMLPI:
newe = coerce_to_specific_type(pstate, newe, TEXTOID,
"XMLPI");
break;
case IS_XMLROOT:
if (i == 0)
newe = coerce_to_specific_type(pstate, newe, XMLOID,
"XMLROOT");
else if (i == 1)
newe = coerce_to_specific_type(pstate, newe, TEXTOID,
"XMLROOT");
else
newe = coerce_to_boolean(pstate, newe, "XMLROOT");
break;
}
newx->args = lappend(newx->args, newe);
i++;
}
return (Node *) newx;
}
static Node *
transformBooleanTest(ParseState *pstate, BooleanTest *b)
{
@ -1415,56 +1516,6 @@ transformBooleanTest(ParseState *pstate, BooleanTest *b)
return (Node *) b;
}
static Node *
transformXmlExpr(ParseState *pstate, XmlExpr *x)
{
ListCell *lc;
XmlExpr *newx = makeNode(XmlExpr);
newx->op = x->op;
if (x->name)
newx->name = map_sql_identifier_to_xml_name(x->name, false);
else
newx->name = NULL;
foreach(lc, x->named_args)
{
ResTarget *r = (ResTarget *) lfirst(lc);
Node *expr = transformExpr(pstate, r->val);
char *argname = NULL;
if (r->name)
argname = map_sql_identifier_to_xml_name(r->name, false);
else if (IsA(r->val, ColumnRef))
argname = map_sql_identifier_to_xml_name(FigureColname(r->val), true);
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
x->op == IS_XMLELEMENT
? errmsg("unnamed attribute value must be a column reference")
: errmsg("unnamed element value must be a column reference")));
newx->named_args = lappend(newx->named_args,
makeTargetEntry((Expr *) expr, 0, argname, false));
}
foreach(lc, x->args)
{
Node *e = (Node *) lfirst(lc);
Node *newe;
newe = coerce_to_xml(pstate, transformExpr(pstate, e),
(x->op == IS_XMLCONCAT
? "XMLCONCAT"
: (x->op == IS_XMLELEMENT
? "XMLELEMENT"
: "XMLFOREST")));
newx->args = lappend(newx->args, newe);
}
return (Node *) newx;
}
/*
* Construct a whole-row reference to represent the notation "relation.*".
*
@ -1715,6 +1766,9 @@ exprType(Node *expr)
case T_MinMaxExpr:
type = ((MinMaxExpr *) expr)->minmaxtype;
break;
case T_XmlExpr:
type = XMLOID;
break;
case T_NullIfExpr:
type = exprType((Node *) linitial(((NullIfExpr *) expr)->args));
break;
@ -1724,9 +1778,6 @@ exprType(Node *expr)
case T_BooleanTest:
type = BOOLOID;
break;
case T_XmlExpr:
type = XMLOID;
break;
case T_CoerceToDomain:
type = ((CoerceToDomain *) expr)->resulttype;
break;