1 files changed, 39 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/handlers/recorder.rb b/ext/psych/lib/psych/handlers/recorder.rb
new file mode 100644
index 0000000000..4eae62e5f9
--- /dev/null
+++ b/ext/psych/lib/psych/handlers/recorder.rb
@@ -0,0 +1,39 @@
+require 'psych/handler'
+
+module Psych
+  module Handlers
+    ###
+    # This handler will capture an event and record the event.  Recorder events
+    # are available vial Psych::Handlers::Recorder#events.
+    #
+    # For example:
+    #
+    #   recorder = Psych::Handlers::Recorder.new
+    #   parser = Psych::Parser.new recorder
+    #   parser.parse '--- foo'
+    #
+    #   recorder.events # => [list of events]
+    #
+    #   # Replay the events
+    #
+    #   emitter = Psych::Emitter.new $stdout
+    #   recorder.events.each do |m, args|
+    #     emitter.send m, *args
+    #   end
+
+    class Recorder < Psych::Handler
+      attr_reader :events
+
+      def initialize
+        @events = []
+        super
+      end
+
+      EVENTS.each do |event|
+        define_method event do |*args|
+          @events << [event, args]
+        end
+      end
+    end
+  end
+end