1 files changed, 31 insertions, 0 deletions
diff --git a/lib/rubygems/safe_marshal/visitors/stream_printer.rb b/lib/rubygems/safe_marshal/visitors/stream_printer.rb
new file mode 100644
index 0000000000..162b36ad05
--- /dev/null
+++ b/lib/rubygems/safe_marshal/visitors/stream_printer.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require_relative "visitor"
+
+module Gem::SafeMarshal
+  module Visitors
+    class StreamPrinter < Visitor
+      def initialize(io, indent: "")
+        @io = io
+        @indent = indent
+        @level = 0
+      end
+
+      def visit(target)
+        @io.write("#{@indent * @level}#{target.class}")
+        target.instance_variables.each do |ivar|
+          value = target.instance_variable_get(ivar)
+          next if Elements::Element === value || Array === value
+          @io.write(" #{ivar}=#{value.inspect}")
+        end
+        @io.write("\n")
+        begin
+          @level += 1
+          super
+        ensure
+          @level -= 1
+        end
+      end
+    end
+  end
+end