private Query ProcessAxis(Axis root, Flags flags, out Props props)
{
Query result = null;
if (root.Prefix.Length > 0)
{
_needContext = true;
}
_firstInput = null;
Query qyInput;
{
if (root.Input != null)
{
Flags inputFlags = Flags.None;
if ((flags & Flags.PosFilter) == 0)
{
Axis input = root.Input as Axis;
if (input != null)
{
if (
root.TypeOfAxis == Axis.AxisType.Child &&
input.TypeOfAxis == Axis.AxisType.DescendantOrSelf && input.NodeType == XPathNodeType.All
)
{
Query qyGrandInput;
if (input.Input != null)
{
qyGrandInput = ProcessNode(input.Input, Flags.SmartDesc, out props);
}
else
{
qyGrandInput = new ContextQuery();
props = Props.None;
}
result = new DescendantQuery(qyGrandInput, root.Name, root.Prefix, root.NodeType, false, input.AbbrAxis);
if ((props & Props.NonFlat) != 0)
{
result = new DocumentOrderQuery(result);
}
props |= Props.NonFlat;
return result;
}
}
if (root.TypeOfAxis == Axis.AxisType.Descendant || root.TypeOfAxis == Axis.AxisType.DescendantOrSelf)
{
inputFlags |= Flags.SmartDesc;
}
}
qyInput = ProcessNode(root.Input, inputFlags, out props);
}
else
{
qyInput = new ContextQuery();
props = Props.None;
}
}
switch (root.TypeOfAxis)
{
case Axis.AxisType.Ancestor:
result = new XPathAncestorQuery(qyInput, root.Name, root.Prefix, root.NodeType, false);
props |= Props.NonFlat;
break;
case Axis.AxisType.AncestorOrSelf:
result = new XPathAncestorQuery(qyInput, root.Name, root.Prefix, root.NodeType, true);
props |= Props.NonFlat;
break;
case Axis.AxisType.Child:
if ((props & Props.NonFlat) != 0)
{
result = new CacheChildrenQuery(qyInput, root.Name, root.Prefix, root.NodeType);
}
else
{
result = new ChildrenQuery(qyInput, root.Name, root.Prefix, root.NodeType);
}
break;
case Axis.AxisType.Parent:
result = new ParentQuery(qyInput, root.Name, root.Prefix, root.NodeType);
break;
case Axis.AxisType.Descendant:
if ((flags & Flags.SmartDesc) != 0)
{
result = new DescendantOverDescendantQuery(qyInput, false, root.Name, root.Prefix, root.NodeType, /*abbrAxis:*/false);
}
else
{
result = new DescendantQuery(qyInput, root.Name, root.Prefix, root.NodeType, false, /*abbrAxis:*/false);
if ((props & Props.NonFlat) != 0)
{
result = new DocumentOrderQuery(result);
}
}
props |= Props.NonFlat;
break;
case Axis.AxisType.DescendantOrSelf:
if ((flags & Flags.SmartDesc) != 0)
{
result = new DescendantOverDescendantQuery(qyInput, true, root.Name, root.Prefix, root.NodeType, root.AbbrAxis);
}
else
{
result = new DescendantQuery(qyInput, root.Name, root.Prefix, root.NodeType, true, root.AbbrAxis);
if ((props & Props.NonFlat) != 0)
{
result = new DocumentOrderQuery(result);
}
}
props |= Props.NonFlat;
break;
case Axis.AxisType.Preceding:
result = new PrecedingQuery(qyInput, root.Name, root.Prefix, root.NodeType);
props |= Props.NonFlat;
break;
case Axis.AxisType.Following:
result = new FollowingQuery(qyInput, root.Name, root.Prefix, root.NodeType);
props |= Props.NonFlat;
break;
case Axis.AxisType.FollowingSibling:
result = new FollSiblingQuery(qyInput, root.Name, root.Prefix, root.NodeType);
if ((props & Props.NonFlat) != 0)
{
result = new DocumentOrderQuery(result);
}
break;
case Axis.AxisType.PrecedingSibling:
result = new PreSiblingQuery(qyInput, root.Name, root.Prefix, root.NodeType);
break;
case Axis.AxisType.Attribute:
result = new AttributeQuery(qyInput, root.Name, root.Prefix, root.NodeType);
break;
case Axis.AxisType.Self:
result = new XPathSelfQuery(qyInput, root.Name, root.Prefix, root.NodeType);
break;
case Axis.AxisType.Namespace:
if ((root.NodeType == XPathNodeType.All || root.NodeType == XPathNodeType.Element || root.NodeType == XPathNodeType.Attribute) && root.Prefix.Length == 0)
{
result = new NamespaceQuery(qyInput, root.Name, root.Prefix, root.NodeType);
}
else
{
result = new EmptyQuery();
}
break;
default:
throw XPathException.Create(SR.Xp_NotSupported, _query);
}
return result;
}
protected PreSiblingQuery(PreSiblingQuery other) : base(other) { }