class Sass::Tree::Node

def self.inherited(base)
  node_name = base.name.gsub(/.*::(.*?)Node$/, '\\1').downcase
  base.instance_eval <<-METHODS
    # @return [Symbol] The name that is used for this node when visiting.
    def node_name
      :#{node_name}
    end
    # @return [Symbol] The method that is used on the visitor to visit nodes of this type.
    def visit_method
      :visit_#{node_name}
    end
    # @return [Symbol] The method name that determines if the parent is invalid.
    def invalid_child_method_name
      :"invalid_#{node_name}_child?"
    end
    # @return [Symbol] The method name that determines if the node is an invalid parent.
    def invalid_parent_method_name
      :"invalid_#{node_name}_parent?"
    end
  METHODS
end