/// <inheritdoc />
public override void Push(string xpath, string xmlNamespace = null, string prefix = "", int index = -1)
{
PushNamespace(xmlNamespace, prefix);
xpath = QualifyXPath(xpath, prefix, xmlNamespace, index);
pathStack.Push(Tuple.Create(xpath, index));
XElement q;
List <XElement> nodes = null;
if (elementStack.Count == 0)
{
q = (from x in RootElement.Elements(xpath) select x).FirstOrDefault();
}
else if (CurrentElement == null)
{
q = null;
}
else if (index == -1)
{
q = (from x in CurrentElement.Elements(xpath) select x).FirstOrDefault();
}
else
{
// Get the collection and work out which one we want.
nodes = XElements(xpath);
q = index > nodes.Count ? null : nodes[index - 1];
}
elementStack.Push(CurrentElement);
CurrentElement = q;
CurrentNodes = nodes;
}
private XElement ToXElement(string xpath, string prefix = "", int index = -1)
{
if (string.IsNullOrEmpty(xpath) || CurrentElement == null)
{
return(CurrentElement);
}
xpath = QualifyXPath(xpath, prefix);
if (index == -1)
{
return(CurrentElement.Elements(xpath).FirstOrDefault());
}
var nodes = CurrentElement.Elements(xpath).ToList();
return(nodes.Count >= index ? nodes[index - 1] : null);
}
private List <XElement> XElements(string xpath)
{
List <XElement> nodes;
var ns = nodesStack[elementStack.Count];
// Need to query
if (ns == null)
{
nodes = (from x in CurrentElement.Elements(xpath) select x).ToList();
// Locally cache nodes until the next pop^2, i.e. acquire on Jim[1] and don't
// remove until pop Jim's parent.
nodesStack[elementStack.Count] = nodes;
}
else
{
nodes = ns;
}
return(nodes);
}
public IEnumerable <XElement> PropertyElements() => CurrentElement.Elements(CompositeDefinitionHelper.Property);
