* ext/psych/lib: moved external library dependent files from lib.

  [ruby-core:29129]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27112 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 40 insertions, 0 deletions

diff --git a/ext/psych/lib/psych/nodes/node.rb b/ext/psych/lib/psych/nodes/node.rb
new file mode 100644
index 0000000000..0de768c7ac
--- /dev/null
+++ b/ext/psych/lib/psych/nodes/node.rb
@@ -0,0 +1,40 @@
+require 'stringio'
+
+module Psych
+  module Nodes
+    ###
+    # The base class for any Node in a YAML parse tree.  This class should
+    # never be instantiated.
+    class Node
+      # The children of this node
+      attr_reader :children
+
+      # An associated tag
+      attr_reader :tag
+
+      # Create a new Psych::Nodes::Node
+      def initialize
+        @children = []
+      end
+
+      ###
+      # Convert this node to Ruby.
+      #
+      # See also Psych::Visitors::ToRuby
+      def to_ruby
+        Visitors::ToRuby.new.accept self
+      end
+      alias :transform :to_ruby
+
+      ###
+      # Convert this node to YAML.
+      #
+      # See also Psych::Visitors::Emitter
+      def to_yaml
+        io = StringIO.new
+        Visitors::Emitter.new(io).accept self
+        io.string
+      end
+    end
+  end
+end