1 files changed, 37 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/visitors/json_tree.rb b/ext/psych/lib/psych/visitors/json_tree.rb
new file mode 100644
index 0000000000..0440dc778d
--- /dev/null
+++ b/ext/psych/lib/psych/visitors/json_tree.rb
@@ -0,0 +1,37 @@
+module Psych
+  module Visitors
+    class JSONTree < YAMLTree
+      def visit_Symbol o
+        append create_scalar o.to_s
+      end
+
+      def visit_NilClass o
+        scalar = Nodes::Scalar.new(
+          'null', nil, nil, true, false, Nodes::Scalar::PLAIN)
+        append scalar
+      end
+
+      private
+      def create_document
+        doc = super
+        doc.implicit     = true
+        doc.implicit_end = true
+        doc
+      end
+
+      def create_mapping
+        map = super
+        map.style = Nodes::Mapping::FLOW
+        map
+      end
+
+      def create_scalar value, anchor = nil, tag = nil, plain = false, quoted = true, style = Nodes::Scalar::ANY
+        super(value, anchor, tag, false, true, style)
+      end
+
+      def create_sequence anchor = nil, tag = nil, implicit = true, style = Nodes::Sequence::FLOW
+        super
+      end
+    end
+  end
+end