split node classes into separate files

lib/sof/node.rb

@@ -1,7 +1,7 @@
 # We transform objects into a tree of nodes
 
 module Sof
-  #abstract base class for nodes in the tree
+  # abstract base class for nodes in the tree
   # may be referenced (should be a simple name or number)
   class Node
     include Util
@@ -19,40 +19,4 @@ module Sof
     end
     attr_reader :referenced
   end
-  
-  class SimpleNode < Node
-    def initialize data , ref = nil
-      super(ref)
-      @data = data
-    end
-    attr_reader :data
-    def out io , level
-      super(io,level)
-      io.write(data)
-    end
-  end
-  
-  class ObjectNode < Node
-    def initialize data , ref
-      super(ref)
-      @data = data 
-      @children = []
-    end
-    attr_reader   :children ,  :data
-    def add k , v
-      @children << [k,v]
-    end
-    def out io , level = 0
-      super
-      io.write(@data)
-      indent = " " * (level + 1)
-      @children.each_with_index do |child , i|
-        k , v = child
-        io.write "\n#{indent}"
-        k.out(io , level + 2)
-        io.write " "
-        v.out(io , level + 2)
-      end
-    end
-  end
 end