Add render class method

Original commit 5f9a829

Author: zetachang

lib/react/component/class_methods.rb

@@ -27,6 +27,18 @@ def deprecation_warning(message)
         end
       end
 
+      def render(*args, &block)
+        if args[0].is_a? Hash
+          define_method :render do
+            yield
+          end
+        else
+          define_method :render do
+            send *args, &block
+          end
+        end
+      end
+
       def validator
         @validator ||= Validator.new(props_wrapper)
       end

spec/react/dsl_spec.rb

@@ -3,6 +3,18 @@
 if opal?
 describe 'the React DSL' do
 
+  it "can define the render method with the render macro", only: true do
+    stub_const 'Foo', Class.new
+    Foo.class_eval do
+      include React::Component
+      render(:div, class: :foot) do
+        "hello"
+      end
+    end
+
+    expect(React.render_to_static_markup(React.create_element(Foo))).to eq('<div class="foot">hello</div>')
+  end
+
   it "will turn the last string in a block into a element" do
     stub_const 'Foo', Class.new
     Foo.class_eval do