class Nokogiri::CSS::XPathVisitor

def visit_combinator(node)
  if is_of_type_pseudo_class?(node.value.last)
    "#{node.value.first&.accept(self)}][#{node.value.last.accept(self)}"
  else
    "#{node.value.first&.accept(self)} and #{node.value.last.accept(self)}"
  end
end