rename the XX_slot classes to SlottedXX

move to slotted and slots (wip)

lib/slot_machine/slotted.rb

@@ -0,0 +1,37 @@
+module SlotMachine
+
+  class Slotted
+
+    def self.for(object , slots)
+      case object
+      when :message
+        SlottedMessage.new(slots)
+      when Constant
+        SlottedConstant.new(object , slots)
+      when Parfait::Object , Risc::Label
+        SlottedObject.new(object , slots)
+      else
+        raise "not supported type #{object}"
+      end
+    end
+
+    attr_reader :slots
+    # is an array of symbols, that specifies the first the object, and then the Slot.
+    # The first element is either a known type name (Capitalized symbol of the class name) ,
+    # or the symbol :message
+    # And subsequent symbols must be instance variables on the previous type.
+    # Examples:  [:message , :receiver] or [:Space , :next_message]
+    def initialize( slots)
+      raise "No slots #{object}" unless slots
+      slots = [slots] unless slots.is_a?(Array)
+      @slots =  slots
+    end
+
+    def to_s
+      names = [known_name] + @slots
+      "[#{names.join(', ')}]"
+    end
+
+
+  end
+end