Visitor to detect left-recursion in a grammar.
This visitor requires that text-only productions
TextTester have been marked as such.
author: Robert Grimm version: $Revision: 1.47 $
Get the set of nonterminals corresponding to left-recursive
productions. Note that this method must only be called after
visiting the corresponding grammar with this visitor.
The set of left-recursive nonterminals.
Visit the specified element. This method provides the default
implementation for node markers, actions, parse tree nodes, null
literals, and value elements.