1 files changed, 32 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/json/stream.rb b/ext/psych/lib/psych/json/stream.rb
new file mode 100644
index 0000000000..a6da584cbf
--- /dev/null
+++ b/ext/psych/lib/psych/json/stream.rb
@@ -0,0 +1,32 @@
+module Psych
+  module JSON
+    class Stream < Psych::Stream
+      class Emitter < Psych::Stream::Emitter # :nodoc:
+        def start_document version, tag_directives, implicit
+          super(version, tag_directives, !streaming?)
+        end
+
+        def start_mapping anchor, tag, implicit, style
+          super(anchor, tag, implicit, Nodes::Mapping::FLOW)
+        end
+
+        def start_sequence anchor, tag, implicit, style
+          super(anchor, tag, implicit, Nodes::Sequence::FLOW)
+        end
+
+        def scalar value, anchor, tag, plain, quoted, style
+          if "tag:yaml.org,2002:null" == tag
+            super('null', nil, nil, true, false, Nodes::Scalar::PLAIN)
+          else
+            super
+          end
+        end
+      end
+
+      def visit_String o
+        @emitter.scalar o.to_s, nil, nil, false, true, Nodes::Scalar::ANY
+      end
+      alias :visit_Symbol :visit_String
+    end
+  end
+end