internal static Duo <XmlNode, string> GetNodeAtPosition(XmlNode node, int selectionStart, int selectionLength, XmlNodeType moveUpTo, params XmlNodeType[] moveUpIf)
{
XmlNode parentNode = null;
string str = null;
string str2;
if ((((node != null) && !SharedUtil.IsEmpty(str2 = node.OuterXml)) && ((selectionStart >= 0) && (selectionStart <= str2.Length))) && ((selectionLength >= 0) && ((selectionStart + selectionLength) <= str2.Length)))
{
str = str2.Substring(selectionStart, selectionLength);
if (!node.HasChildNodes)
{
parentNode = node;
}
else
{
int num;
string innerXml = node.InnerXml;
int num2 = num = str2.IndexOf(innerXml, str2.IndexOf('>'));
if (num2 < 0)
{
num2 = num = 0;
}
if (selectionStart >= num)
{
foreach (XmlNode node3 in node.ChildNodes)
{
if (((selectionStart >= num2) && (selectionStart < (num2 + node3.OuterXml.Length))) && ((parentNode = GetNodeAtPosition(node3, selectionStart - num2, selectionLength, moveUpTo, new XmlNodeType[0]).Value1) != null))
{
break;
}
num2 += node3.OuterXml.Length;
}
}
if (parentNode == null)
{
parentNode = node;
}
}
if (moveUpTo != XmlNodeType.None)
{
while (((parentNode != null) && (parentNode.NodeType != moveUpTo)) && (parentNode.ParentNode != null))
{
parentNode = parentNode.ParentNode;
}
}
else if (!SharedUtil.IsEmpty((ICollection)moveUpIf))
{
while (((parentNode != null) && SharedUtil.In <XmlNodeType>(parentNode.NodeType, moveUpIf)) && (parentNode.ParentNode != null))
{
parentNode = parentNode.ParentNode;
}
}
}
return(new Duo <XmlNode, string>(parentNode, str));
}