1 files changed, 19 insertions, 0 deletions
diff --git a/ruby_2_2/ext/psych/lib/psych/visitors/visitor.rb b/ruby_2_2/ext/psych/lib/psych/visitors/visitor.rb
new file mode 100644
index 0000000000..4d7772f428
--- /dev/null
+++ b/ruby_2_2/ext/psych/lib/psych/visitors/visitor.rb
@@ -0,0 +1,19 @@
+module Psych
+  module Visitors
+    class Visitor
+      def accept target
+        visit target
+      end
+
+      private
+
+      DISPATCH = Hash.new do |hash, klass|
+        hash[klass] = "visit_#{klass.name.gsub('::', '_')}"
+      end
+
+      def visit target
+        send DISPATCH[target.class], target
+      end
+    end
+  end
+end