add Item#closed_items

lib/imbecile/parser/item.rb

@@ -27,6 +27,16 @@ class Imbecile
         self == other
       end
 
+      def closed_items
+        if @rule.components[@position].is_a?(Array)
+          @rule.components[@position].map do |rule|
+            Item.new(rule, 0)
+          end
+        else
+          []
+        end
+      end
+
     end
 
   end

lib/imbecile/parser/item_set.rb

@@ -13,8 +13,7 @@ class Imbecile
           this_eval_items = eval_items
           eval_items = Set.new
           this_eval_items.each do |item|
-            if item.next_component.is_a?(Rule)
-            end
+            eval_items += item.closed_items
           end
           @items += eval_items
         end