# A abstract visitor on syntactic trees generated by nitcc
abstract class Visitor
	# The main entry point to visit a node `n`
	# Should not be redefined
	fun enter_visit(n: Node)
	do
		visit(n)
	end

	# The specific implementation of a visit
	#
	# Should be redefined by concrete visitors
	#
	# Should not be called directly (use `enter_visit` instead)
	#
	# By default, the visitor just rescursively visit the children of `n`
	protected fun visit(n: Node)
	do
		n.visit_children(self)
	end
end