copies of the old code to start the new layer

lib/ast/basic_expressions.rb

@@ -0,0 +1,42 @@
+# collection of the simple ones, int and strings and such
+
+module Ast
+
+  class IntegerExpression < Expression
+#    attr_reader :value
+    def compile context
+      Vm::IntegerConstant.new value
+    end
+  end
+
+  class NameExpression < Expression
+#    attr_reader  :name
+
+    # compiling a variable resolves it. if it wasn't defined, raise an exception 
+    def compile context
+      raise "Undefined variable #{name}, defined locals #{context.locals.keys.join('-')}" unless context.locals.has_key?(name)
+      context.locals[name]
+    end
+  end
+
+  class ModuleName < NameExpression
+
+    def compile context
+      clazz = context.object_space.get_or_create_class name
+      raise "uups #{clazz}.#{name}" unless clazz
+      #class qualifier, means call from metaclass
+      clazz = clazz.meta_class
+      puts "CLAZZ #{clazz}"
+      clazz
+    end    
+  end
+
+  class StringExpression < Expression
+#    attr_reader  :string
+    def compile context
+      value = Vm::StringConstant.new(string)
+      context.object_space.add_object value 
+      value
+    end
+  end
+end