move compiler to bosl and get first test working (adjusting syntax as i go)

lib/bosl/compiler/name_expression.rb

@@ -0,0 +1,23 @@
+module Bosl
+  module Compiler
+
+      #    attr_reader  :name
+      # compiling name needs to check if it's a variable and if so resolve it
+      # otherwise it's a method without args and a send is issued.
+      # whichever way this goes the result is stored in the return slot (as all compiles)
+      def self.compile_name expression , method
+        name = expression.to_a.first
+        return Virtual::Self.new( Reference.new(method.for_class)) if name == :self
+        # either an argument, so it's stored in message
+        ret =  Virtual::Return.new
+        if( index = method.has_arg(name))
+          method.source.add_code Virtual::Set.new( Virtual::ArgSlot.new(index ) , ret)
+        else # or a local so it is in the frame
+          index = method.ensure_local( name )
+          method.source.add_code Virtual::Set.new(Virtual::FrameSlot.new(index ) , ret )
+        end
+        return ret
+      end
+
+  end #module
+end