public object path(XPathNodeIterator arg)
{
// fn:path($arg as node()?) as xs:string?
XPathNavigator node = ExtensionObjectConvert.ToXPathNavigator(arg);
if (node == null)
{
return(ExtensionObjectConvert.EmptyIterator);
}
var reverseBuffer = new List <string>();
XPathNavigator clone = node.Clone();
path_impl(clone, reverseBuffer);
if (reverseBuffer.Count == 1)
{
return(reverseBuffer[0]);
}
// replace document-node path expr with empty string
// so join operation doesn't create //
if (reverseBuffer[reverseBuffer.Count - 1] == "/")
{
reverseBuffer[reverseBuffer.Count - 1] = "";
}
return(String.Join("/", Enumerable.Reverse(reverseBuffer)));
}
protected object base_uri(XPathNodeIterator arg)
{
// fn:base-uri($arg as node()?) as xs:anyURI?
XPathNavigator node = ExtensionObjectConvert.ToXPathNavigator(arg);
if (node == null)
{
return(ExtensionObjectConvert.EmptyIterator);
}
return(node.BaseURI);
}
protected bool has_children(XPathNodeIterator arg)
{
//fn:has-children($node as node()?) as xs:boolean
XPathNavigator node = ExtensionObjectConvert.ToXPathNavigator(arg);
if (node == null)
{
return(false);
}
return(node.HasChildren);
}
public object root(XPathNodeIterator arg)
{
// fn:root($arg as node()?) as node()?
XPathNavigator node = ExtensionObjectConvert.ToXPathNavigator(arg);
if (node == null)
{
return(ExtensionObjectConvert.EmptyIterator);
}
XPathNavigator clone = node.Clone();
clone.MoveToRoot();
return(clone);
}
public object nilled(XPathNodeIterator iter)
{
// fn:nilled($arg as node()?) as xs:boolean?
XPathNavigator node = ExtensionObjectConvert.ToXPathNavigator(iter);
if (node == null ||
node.NodeType != XPathNodeType.Element)
{
return(ExtensionObjectConvert.EmptyIterator);
}
IXmlSchemaInfo schemaInfo = node.SchemaInfo;
return(schemaInfo != null &&
schemaInfo.IsNil);
}
public object head(object arg)
{
// fn:head($arg as item()*) as item()?
XPathNodeIterator iter = arg as XPathNodeIterator;
if (iter == null)
{
// if not iterator then it's a single item
return(arg);
}
if (ExtensionObjectConvert.IsEmpty(iter))
{
return(ExtensionObjectConvert.EmptyIterator);
}
return(ExtensionObjectConvert.ToXPathNavigator(iter));
}
