private static XmlNodeList SelectAttributes(XmlNode parentNode, string path)
{
Debug.Assert(path[0] == '@');
int pos = 1;
XmlAttributeCollection attributes = parentNode.Attributes;
XmlPatchNodeList nodeList = null;
for (;;)
{
string name = ReadAttrName(path, ref pos);
if (nodeList == null)
{
if (pos == path.Length)
{
nodeList = new SingleNodeList();
}
else
{
nodeList = new MultiNodeList();
}
}
XmlNode attr = attributes.GetNamedItem(name);
if (attr == null)
{
OnNoMatchingNode(path);
}
nodeList.AddNode(attr);
if (pos == path.Length)
{
break;
}
else if (path[pos] == '|')
{
pos++;
if (path[pos] != '@')
{
OnInvalidExpression(path);
}
pos++;
}
else
{
OnInvalidExpression(path);
}
}
return(nodeList);
}
private static XmlNodeList SelectChildNodes(XmlNode parentNode, string path, int startPos)
{
int pos = startPos;
XmlPatchNodeList nodeList = null;
XmlNodeList children = parentNode.ChildNodes;
int nodePos = ReadPosition(path, ref pos);
if (pos == path.Length)
{
nodeList = new SingleNodeList();
}
else
{
nodeList = new MultiNodeList();
}
for (;;)
{
if (nodePos <= 0 || nodePos > children.Count)
{
OnNoMatchingNode(path);
}
XmlNode node = children.Item(nodePos - 1);
nodeList.AddNode(node);
if (pos == path.Length)
{
break;
}
else if (path[pos] == '|')
{
pos++;
}
else if (path[pos] == '-')
{
pos++;
int endNodePos = ReadPosition(path, ref pos);
if (endNodePos <= 0 || endNodePos > children.Count)
{
OnNoMatchingNode(path);
}
while (nodePos < endNodePos)
{
nodePos++;
node = node.NextSibling;
nodeList.AddNode(node);
}
Debug.Assert((object)node == (object)children.Item(endNodePos - 1));
if (pos == path.Length)
{
break;
}
else if (path[pos] == '|')
{
pos++;
}
else
{
OnInvalidExpression(path);
}
}
nodePos = ReadPosition(path, ref pos);
}
return(nodeList);
}