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;
}
