class Surrogate # This manages the definitions that were given to the class # The hatchlings are added to the instances, and they look here # to find out about how their methods are implemented. class Hatchery attr_accessor :klass def initialize(klass) self.klass = klass klass_can_define_api_methods end def define(method_name, options={}, &block) add_api_method_for method_name add_verb_helpers_for method_name add_noun_helpers_for method_name api_methods[method_name] = Options.new options, block klass end def api_methods @api_methods ||= {} end def api_method_names api_methods.keys - [:initialize] end private def klass_can_define_api_methods klass.singleton_class.__send__ :define_method, :define, &method(:define) end def add_api_method_for(method_name) klass.__send__ :define_method, method_name do |*args, &block| @hatchling.invoke_method method_name, args, &block end end def add_verb_helpers_for(method_name) add_helpers_for method_name, "will_#{method_name}" end def add_noun_helpers_for(method_name) add_helpers_for method_name, "will_have_#{method_name}" end def add_helpers_for(method_name, helper_name) klass.__send__ :define_method, helper_name do |*args, &block| @hatchling.prepare_method method_name, args, &block self end end end end