Code cleanup. Moved core extensions into a separate file.

lib/net/dns.rb

@@ -1,10 +1,5 @@
-##
-#
-# dns.rb
-#
-# $id$
-#
-##
+require 'net/dns/core_ext'
+
 
 module Net # :nodoc:
   module DNS
@@ -30,6 +25,7 @@ module DNS
     # Size of a short int
     INT16SZ = 2
 
+
     module QueryTypes
 
       SIGZERO   = 0
@@ -113,5 +109,5 @@ module QueryClasses
     include QueryTypes
     include QueryClasses
 
-  end # module DNS
-end # module Net
+  end
+end

lib/net/dns/core_ext.rb

@@ -0,0 +1,52 @@
+module Net # :nodoc:
+  module DNS
+
+    module HashKeys # :nodoc:
+
+      # Returns an hash with all the
+      # keys turned into downcase
+      #
+      #   hsh = {"Test" => 1, "FooBar" => 2}
+      #   hsh.downcase_keys!
+      #      #=> {"test"=>1,"foobar"=>2}
+      #
+      def downcase_keys!
+        hsh = Hash.new
+        self.each do |key,val|
+          hsh[key.downcase] = val
+        end
+        self.replace(hsh)
+      end
+
+    end
+
+    module HashOperators # :nodoc:
+
+      # Performs a sort of group difference
+      # operation on hashes or arrays
+      #
+      #   a = {:a=>1,:b=>2,:c=>3}
+      #   b = {:a=>1,:b=>2}
+      #   c = [:a,:c]
+      #   a-b #=> {:c=>3}
+      #   a-c #=> {:b=>2}
+      #
+      def -(other)
+        case other
+          when Hash
+            delete_if { |k,v| other.has_key?(k) }
+          when Array
+            delete_if { |k,v| other.include?(k) }
+        end
+      end
+
+    end
+
+  end
+end
+
+
+class Hash # :nodoc:
+  include Net::DNS::HashKeys
+  include Net::DNS::HashOperators
+end