public static T Clone <T>(CloneContext cloneContext, T item) where T : class, IAst
{
if (item == null)
{
return(null);
}
var clone = (T)Activator.CreateInstance(item.GetType(), BindingFlags.Instance | BindingFlags.NonPublic);
item.CloneTo(cloneContext, clone);
LinkParents.Link(clone);
return(clone);
}
public static void Walk <T>(ref T node, AstVisitor prefix, AstVisitor postfix) where T : IAst
{
IAst first = node;
IAst second = node;
if (first == null)
{
return;
}
if (prefix(ref first))
{
first.Walk(prefix, postfix);
}
if (second.Equals(first))
{
postfix(ref first);
}
if (second.Equals(first))
{
return;
}
if (!ReferenceEquals(first, null))
{
if (!(first is T))
{
throw new Exception(
string.Format(
"Node replaced not of the correct type {0}.",
typeof(T).Name));
}
LinkParents.Link(first);
first.ParentAst = node.ParentAst;
}
node = (T)first;
}
public static void Link(IAst node)
{
var parents = new LinkParents();
Ast.Walk(ref node, parents.Prefix, parents.Postfix);
}