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);
}
