1 files changed, 103 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/render_options.rb b/actionpack/lib/action_controller/metal/render_options.rb
new file mode 100644
index 0000000000..65ee09883e
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/render_options.rb
@@ -0,0 +1,103 @@
+module ActionController
+  module RenderOptions
+    extend ActiveSupport::Concern
+
+    included do
+      extlib_inheritable_accessor :_renderers
+      self._renderers = []
+    end
+
+    module ClassMethods
+      def _write_render_options
+        renderers = _renderers.map do |r|
+          <<-RUBY_EVAL
+            if options.key?(:#{r})
+              _process_options(options)
+              return _render_#{r}(options[:#{r}], options)
+            end
+          RUBY_EVAL
+        end
+
+        class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
+          def _handle_render_options(options)
+            #{renderers.join}
+          end
+        RUBY_EVAL
+      end
+
+      def _add_render_option(name)
+        _renderers << name
+        _write_render_options
+      end
+    end
+
+    def render_to_body(options)
+      _handle_render_options(options) || super
+    end
+  end
+
+  module RenderOption #:nodoc:
+    def self.extended(base)
+      base.extend ActiveSupport::Concern
+      base.send :include, ::ActionController::RenderOptions
+
+      def base.register_renderer(name)
+        included { _add_render_option(name) }
+      end
+    end
+  end
+
+  module Renderers
+    module Json
+      extend RenderOption
+      register_renderer :json
+
+      def _render_json(json, options)
+        json = ActiveSupport::JSON.encode(json) unless json.respond_to?(:to_str)
+        json = "#{options[:callback]}(#{json})" unless options[:callback].blank?
+        self.content_type ||= Mime::JSON
+        self.response_body = json
+      end
+    end
+
+    module Js
+      extend RenderOption
+      register_renderer :js
+
+      def _render_js(js, options)
+        self.content_type ||= Mime::JS
+        self.response_body = js
+      end
+    end
+
+    module Xml
+      extend RenderOption
+      register_renderer :xml
+
+      def _render_xml(xml, options)
+        self.content_type ||= Mime::XML
+        self.response_body  = xml.respond_to?(:to_xml) ? xml.to_xml : xml
+      end
+    end
+
+    module RJS
+      extend RenderOption
+      register_renderer :update
+
+      def _render_update(proc, options)
+        generator = ActionView::Helpers::PrototypeHelper::JavaScriptGenerator.new(view_context, &proc)
+        self.content_type = Mime::JS
+        self.response_body = generator.to_s
+      end
+    end
+
+    module All
+      extend ActiveSupport::Concern
+
+      include ActionController::Renderers::Json
+      include ActionController::Renderers::Js
+      include ActionController::Renderers::Xml
+      include ActionController::Renderers::RJS
+    end
+  end
+end