fixing array tests, seperated nodes into different types

lib/sof/array.rb

@@ -1,6 +1,6 @@
 Array.class_eval do
   def to_sof_node(members , level)
-    node = Sof::Node.new(nil)
+    node = Sof::ChildrenNode.new(nil)
     each do |object|
       node.add members.to_sof_node( object )
     end

lib/sof/node.rb

@@ -5,22 +5,34 @@ module Sof
     def initialize head
       @head = head
     end
-    attr_accessor :head , :children
+    attr_accessor :head
+    def out io , level
+      io.write(head) if head
+    end
+  end
+  
+  class ChildrenNode < Node
+    def initialize head
+      super(head)
+      @children = []
+    end
+    attr_accessor  :children
+
     def add child
       child = Node.new(child) if(child.is_a? String)
-      @children = [] if(@children.nil?)
       @children << child
     end
 
     def out io , level = 0
-      io.write head
-      return unless @children
-      first = @children[0]
-      io.write " "
+      super
+      return if @children.empty?
+      first = @children.first
+      io.write "-"
       first.out(io , level + 1)
       indent = " " * level      
-      @children.each do |child|
-        next if child == first  # done already
+      @children.each_with_index do |child , i|
+        next if i == 0  # done already
+        io.write "\n"
         io.write indent
         io.write "-"
         child.out(io , level + 1)

lib/sof/writer.rb

@@ -8,7 +8,7 @@ module Sof
     def write
       node = to_sof_node(@members.root)
       io = StringIO.new
-      node.out( io )
+      node.out( io , 0 )
       io.string
     end