private static QilLoop BuildAxisFilter(QilPatternFactory f, QilIterator itr, XPathAxis xpathAxis, XPathNodeType nodeType, string name, string nsUri)
{
QilNode nameTest = (
name != null && nsUri != null ? f.Eq(f.NameOf(itr), f.QName(name, nsUri)) : // ns:bar || bar
nsUri != null ? f.Eq(f.NamespaceUriOf(itr), f.String(nsUri)) : // ns:*
name != null ? f.Eq(f.LocalNameOf(itr), f.String(name)) : // *:foo
/*name == nsUri == null*/ f.True() // *
);
XmlNodeKindFlags intersection = XPathBuilder.AxisTypeMask(itr.XmlType.NodeKinds, nodeType, xpathAxis);
QilNode typeTest = (
intersection == 0 ? f.False() : // input & required doesn't intersect
intersection == itr.XmlType.NodeKinds ? f.True() : // input is subset of required
/*else*/ f.IsType(itr, T.NodeChoice(intersection))
);
QilLoop filter = f.BaseFactory.Filter(itr, f.And(typeTest, nameTest));
filter.XmlType = T.PrimeProduct(T.NodeChoice(intersection), filter.XmlType.Cardinality);
return(filter);
}