/// <summary>
/// Return the index of obj within its siblings, including only elements with the same node name.
/// </summary>
///
/// <param name="obj">
/// The object to seek
/// </param>
/// <param name="onlyOfSameType">
/// true to only objects of the same NodeName should be considered
/// </param>
/// <param name="fromLast">
/// Count from the last element instead of the first.
/// </param>
///
/// <returns>
/// The zero-based index of obj within its siblings (or its siblings of the same type)
/// </returns>
private int IndexOf(IDomElement obj, bool onlyOfSameType, bool fromLast = false)
{
// get the index just for this type
int typeIndex = 0;
var childNodes = obj.ParentNode.ChildNodes;
int length = childNodes.Count;
for (int index = 0; index < length; index++)
{
var el = NthChildMatcher.GetEffectiveChild(childNodes, index, fromLast);
if (el.NodeType == NodeType.ELEMENT_NODE)
{
if (!onlyOfSameType || el.NodeNameID == obj.NodeNameID)
{
if (ReferenceEquals(el, obj))
{
return(typeIndex);
}
typeIndex++;
}
}
}
return(-1);
}
