# File lib/asciidoctor/extensions.rb, line 1414 def register *args, &block argc = args.size if block_given? resolved_group = block elsif (group = args.pop) # QUESTION should we instantiate the group class here or defer until activation?? resolved_group = (resolve_class group) || group else raise ::ArgumentError, %(Extension group to register not specified) end name = args.pop || generate_name unless args.empty? raise ::ArgumentError, %(Wrong number of arguments (#{argc} for 1..2)) end groups[name.to_sym] = resolved_group end