parse_visibility

# File lib/rdoc/parser/ruby.rb, line 1343
  def parse_visibility(container, single, tk)
    singleton = (single == SINGLE)

    vis_type = tk.name

    vis = case vis_type
          when 'private'   then :private
          when 'protected' then :protected
          when 'public'    then :public
          when 'private_class_method' then
            singleton = true
            :private
          when 'public_class_method' then
            singleton = true
            :public
          when 'module_function' then
            singleton = true
            :public
          else
            raise RDoc::Error, "Invalid visibility: #{tk.name}"
          end

    skip_tkspace_comment false

    case peek_tk
      # Ryan Davis suggested the extension to ignore modifiers, because he
      # often writes
      #
      #   protected unless $TESTING
      #
    when TkNL, TkUNLESS_MOD, TkIF_MOD, TkSEMICOLON then
      container.ongoing_visibility = vis
    else
      if vis_type == 'module_function' then
        args = parse_symbol_arg
        container.set_visibility_for args, :private, false

        module_functions = []

        container.methods_matching args do |m|
          s_m = m.dup
          s_m.singleton = true if RDoc::AnyMethod === s_m
          s_m.visibility = :public
          module_functions << s_m
        end

        module_functions.each do |s_m|
          case s_m
          when RDoc::AnyMethod then
            container.add_method s_m
          when RDoc::Attr then
            container.add_attribute s_m
          end
        end
      else
        args = parse_symbol_arg
        container.set_visibility_for args, vis, singleton
      end
    end
  end