# File lib/asciidoctor/extensions.rb, line 1293 def register *args, &block argc = args.length resolved_group = if block_given? block elsif !(group = args.pop) raise ::ArgumentError.new %(Extension group to register not specified) else # QUESTION should we instantiate the group class here or defer until # activation?? case group when ::Class group when ::String class_for_name group when ::Symbol class_for_name group.to_s else group end end name = args.pop || generate_name unless args.empty? raise ::ArgumentError.new %(Wrong number of arguments (#{argc} for 1..2)) end groups[name] = resolved_group end