The {@link ParseTreeVisitor} needs a double dispatch method.
@uml @override
@uml @override
Specialize toStringTree so that it can print out more information based upon the parser.
@uml Return an {@link Interval} indicating the index in the {@link TokenStream} of the first and last token associated with this subtree. If this node is a leaf, then the interval represents a single token and has interval i..i for token index i.
An interface to access the tree of {@link RuleContext} objects created * during a parse that makes the data structure look like a simple parse tree. This node represents both internal nodes, rule invocations, and leaf nodes, token matches.
<p>The payload is either a {@link Token} or a {@link RuleContext} object.</p>