lib/gratr/rdot.rb in gratr-0.4.2 vs lib/gratr/rdot.rb in gratr-0.4.3

@@ -5,9 +5,15 @@
 # This is a modified version of dot.rb from Dave Thomas's rdoc project.  I [Horst Duchene]
 # renamed it to rdot.rb to avoid collision with an installed rdoc/dot.
 #
 # It also supports undirected edges.
 
+class Hash
+  def stringify_keys
+    inject({}) {|options, (key, value)| options[key.to_s] = value; options}
+  end
+end unless Hash.respond_to? :stringify_keys
+
 module DOT
     
   # These glogal vars are used to make nice graph source.
 
   $tab  = '    '