Extracting 1.9.3 backported methods and fixes into a module.

This keeps the main class clean, and it makes it easy to know what was
backported for 1.9.3.

Closes #32

lib/recursive_open_struct.rb

@@ -3,8 +3,10 @@
 
 require 'recursive_open_struct/debug_inspect'
 require 'recursive_open_struct/deep_dup'
+require 'recursive_open_struct/ruby_19_backport'
 
 class RecursiveOpenStruct < OpenStruct
+  include Ruby19Backport if RUBY_VERSION =~ /\A1.9/
   include DebugInspect
 
   def initialize(hash={}, args={})
@@ -20,10 +22,6 @@ def initialize(hash={}, args={})
   def initialize_copy(orig)
     super
 
-    # Apply fix if necessary:
-    #   https://github.com/ruby/ruby/commit/2d952c6d16ffe06a28bb1007e2cd1410c3db2d58
-    @table.each_key{|key| new_ostruct_member(key)} if RUBY_VERSION =~ /^1.9/
-
     # deep copy the table to separate the two objects
     @table = @deep_dup.call(orig.instance_variable_get(:@table))
     # Forget any memoized sub-elements
@@ -40,10 +38,6 @@ def [](name)
     send name
   end
 
-  def []=(name, value)
-    modifiable[new_ostruct_member(name)] = value
-  end if RUBY_VERSION =~ /^1.9/
-
   def new_ostruct_member(name)
     key_name = _get_key_from_table_ name
     unless self.respond_to?(name)
@@ -90,20 +84,6 @@ def delete_field(name)
     @table.delete sym
   end
 
-  def eql?(other)
-    return false unless other.kind_of?(OpenStruct)
-    @table.eql?(other.table)
-  end if RUBY_VERSION =~ /^1.9/
-
-  def hash
-    @table.hash
-  end if RUBY_VERSION =~ /^1.9/
-
-  def each_pair
-    return to_enum(:each_pair) { @table.size } unless block_given?
-    @table.each_pair{|p| yield p}
-  end if RUBY_VERSION =~ /^1.9/
-
   private
 
   def _get_key_from_table_(name)

lib/recursive_open_struct/ruby_19_backport.rb

@@ -0,0 +1,27 @@
+module RecursiveOpenStruct::Ruby19Backport
+  # Apply fix if necessary:
+  #   https://github.com/ruby/ruby/commit/2d952c6d16ffe06a28bb1007e2cd1410c3db2d58
+  def initialize_copy(orig)
+    super
+    @table.each_key{|key| new_ostruct_member(key)}
+  end
+
+  def []=(name, value)
+    modifiable[new_ostruct_member(name)] = value
+  end
+
+  def eql?(other)
+    return false unless other.kind_of?(OpenStruct)
+    @table.eql?(other.table)
+  end
+
+  def hash
+    @table.hash
+  end
+
+  def each_pair
+    return to_enum(:each_pair) { @table.size } unless block_given?
+    @table.each_pair{|p| yield p}
+  end
+end
+