fix the missing reference bug on class

lib/sof/members.rb

@@ -21,7 +21,7 @@ module Sof
         end
         unless occurence.referenced
           #puts "referencing #{@counter} , at level #{level}/#{occurence.level} "
-          occurence.referenced = @counter
+          occurence.set_reference(@counter)
           @counter = @counter + 1
         end
         return

lib/sof/node.rb

@@ -4,13 +4,18 @@ module Sof
   #abstract base class for nodes in the tree
   # may be referenced (should be a simple name or number)
   class Node
-    def initialize referenced
-      @referenced = referenced
-    end
     include Util
+    def initialize ref
+      @referenced = ref
+    end
     # must be able to output to a stream
     def out io ,level
-      io.write "&#{referenced} " if referenced
+      io.write "&#{@referenced} " if @referenced
+    end
+    def as_string(level)
+      io = StringIO.new
+      out(io,level)
+      io.string
     end
     attr_reader :referenced
   end
@@ -22,7 +27,7 @@ module Sof
     end
     attr_reader :data
     def out io , level
-      super
+      super(io,level)
       io.write(data)
     end
   end

lib/sof/occurence.rb

@@ -4,9 +4,13 @@ module Sof
     def initialize object , level
       @object = object
       @level = level
+      @referenced = nil      
     end
-    attr_reader   :object
+    def set_reference r
-    attr_accessor :level , :referenced
+      @referenced = r
+    end
+    attr_reader   :object , :referenced
+    attr_accessor :level
   end
 
 end

lib/sof/writer.rb

@@ -42,7 +42,7 @@ module Sof
         atts[a] =  to_sof_node(val , level + 1)
       end
       immediate , extended = atts.partition {|a,val| val.is_a?(SimpleNode) }
-      head += immediate.collect {|a,val| "#{a.to_sof()} => #{val.data}"}.join(", ") + ")"
+      head += immediate.collect {|a,val| "#{a.to_sof()} => #{val.as_string(level)}"}.join(", ") + ")"
       return SimpleNode.new(head) if( ref.nil? and extended.empty? and head.length < 30 )
       node = ObjectNode.new(head , ref)
       extended.each do |a , val|