// Returns a copy of a sibling tree. node is expected to be the first sibling.
private TextTreeNode DeepCopyContainedNodes(TextTreeNode node)
{
TextTreeNode rootClone;
TextTreeNode previousClone;
TextTreeNode clone;
TextTreeTextElementNode elementNode;
rootClone = null;
previousClone = null;
do
{
elementNode = node as TextTreeTextElementNode;
if (elementNode != null)
{
clone = DeepCopy(elementNode);
}
else
{
clone = node.Clone();
}
// clone will be null in one case: if we're trying to clone an
// empty TextNode. We can skip empty TextNodes (symbol count == 0)
// because we know the clones have no TextPointer references, so
// an empty node serves no purpose.
Invariant.Assert(clone != null || node is TextTreeTextNode && node.SymbolCount == 0);
if (clone != null)
{
clone.ParentNode = previousClone;
if (previousClone != null)
{
previousClone.RightChildNode = clone;
}
else
{
Invariant.Assert(clone.Role == SplayTreeNodeRole.LocalRoot);
// Remember the first clone created.
rootClone = clone;
}
previousClone = clone;
}
node = (TextTreeNode)node.GetNextNode();
}
while (node != null);
return rootClone;
}
