Refactor for readability

activesupport/lib/active_support/ordered_hash.rb

 require 'yaml'
 
+YAML.add_builtin_type("omap") do |type, val|
+  ActiveSupport::OrderedHash[val.map(&:to_a).map(&:first)]
+end
+
 # OrderedHash is namespaced to prevent conflicts with other implementations
 module ActiveSupport
-  # Hash is ordered in Ruby 1.9!
-  if RUBY_VERSION >= '1.9'
-    class OrderedHash < ::Hash #:nodoc:
+  class OrderedHash < ::Hash #:nodoc:
+    def to_yaml_type
+      "!tag:yaml.org,2002:omap"
     end
-  else
-    class OrderedHash < Hash #:nodoc:
+
+    def to_yaml(opts = {})
+      YAML.quick_emit(self, opts) do |out|
+        out.seq(taguri, to_yaml_style) do |seq|
+          each do |k, v|
+            seq.add(k => v)
+          end
+        end
+      end
+    end
+
+    # Hash is ordered in Ruby 1.9!
+    if RUBY_VERSION < '1.9'
       def initialize(*args, &block)
         super
         @keys = []
@@ -55,7 +70,7 @@ def delete(key)
         end
         super
       end
-      
+
       def delete_if
         super
         sync_keys!
@@ -134,31 +149,10 @@ def inspect
         "#<OrderedHash #{super}>"
       end
 
-    private
-
-      def sync_keys!
-        @keys.delete_if {|k| !has_key?(k)}
-      end
-    end
-  end
-
-  class OrderedHash #:nodoc:
-    def to_yaml_type
-      "!tag:yaml.org,2002:omap"
-    end
-
-    def to_yaml(opts = {})
-      YAML.quick_emit(self, opts) do |out|
-        out.seq(taguri, to_yaml_style) do |seq|
-          each do |k, v|
-            seq.add(k => v)
-          end
+      private
+        def sync_keys!
+          @keys.delete_if {|k| !has_key?(k)}
         end
-      end
     end
   end
-
-  YAML.add_builtin_type("omap") do |type, val|
-    ActiveSupport::OrderedHash[val.map(&:to_a).map(&:first)]
-  end
 end