public AstNode ReplaceWith(Func <AstNode, AstNode> replaceFunction)
{
if (replaceFunction == null)
{
throw new ArgumentNullException("replaceFunction");
}
if (parent == null)
{
throw new InvalidOperationException(this.IsNull ? "Cannot replace the null nodes" : "Cannot replace the root node");
}
AstNode oldParent = parent;
AstNode oldSuccessor = nextSibling;
Role oldRole = this.Role;
Remove();
AstNode replacement = replaceFunction(this);
if (oldSuccessor != null && oldSuccessor.parent != oldParent)
{
throw new InvalidOperationException("replace function changed nextSibling of node being replaced?");
}
if (!(replacement == null || replacement.IsNull))
{
if (replacement.parent != null)
{
throw new InvalidOperationException("replace function must return the root of a tree");
}
if (!oldRole.IsValid(replacement))
{
throw new InvalidOperationException(string.Format("The new node '{0}' is not valid in the role {1}", replacement.GetType().Name, oldRole.ToString()));
}
if (oldSuccessor != null)
{
oldParent.InsertChildBeforeUnsafe(oldSuccessor, replacement, oldRole);
}
else
{
oldParent.AddChildUnsafe(replacement, oldRole);
}
}
return(replacement);
}
/// <summary>
/// Clones the whole subtree starting at this AST node.
/// </summary>
/// <remarks>Annotations are copied over to the new nodes; and any annotations implementing ICloneable will be cloned.</remarks>
public AstNode Clone()
{
AstNode copy = (AstNode)MemberwiseClone();
// First, reset the shallow pointer copies
copy.parent = null;
copy.firstChild = null;
copy.lastChild = null;
copy.prevSibling = null;
copy.nextSibling = null;
copy.flags &= ~frozenBit; // unfreeze the copy
// Then perform a deep copy:
for (AstNode cur = firstChild; cur != null; cur = cur.nextSibling)
{
copy.AddChildUnsafe(cur.Clone(), cur.Role);
}
// Finally, clone the annotation, if necessary
copy.CloneAnnotations();
return(copy);
}
