adds instance and class variables to vool

lib/vool/compiler.rb

@@ -92,6 +92,15 @@ module Vool
     def on_lvar expression
       LocalVariable.new(expression.children.first)
     end
+
+    def on_ivar expression
+      InstanceVariable.new(expression.children.first.to_s[1 .. -1].to_sym)
+    end
+
+    def on_cvar expression
+      ClassVariable.new(expression.children.first.to_s[2 .. -1].to_sym)
+    end
+
     def on_lvasgn expression
       name = expression.children[0]
       value = process(expression.children[1])

lib/vool/variables.rb

@@ -9,4 +9,13 @@ module Vool
   class LocalVariable < Statement
     include Named
   end
+
+  class InstanceVariable < Statement
+    include Named
+  end
+
+  class ClassVariable < Statement
+    include Named
+  end
+
 end

test/vool/test_variables.rb

@@ -10,5 +10,26 @@ module Vool
     #   assert_equal SendStatement , lst.class
     # end
 
+    def test_instance_basic
+      lst = Compiler.compile( "@var" )
+      assert_equal InstanceVariable , lst.class
+      assert_equal :var , lst.name
+    end
+
+    def test_instance_return
+      lst = Compiler.compile( "return @var" )
+      assert_equal InstanceVariable , lst.return_value.class
+    end
+
+    def test_class_basic
+      lst = Compiler.compile( "@@var" )
+      assert_equal ClassVariable , lst.class
+      assert_equal :var , lst.name
+    end
+
+    def test_class_return
+      lst = Compiler.compile( "return @@var" )
+      assert_equal ClassVariable , lst.return_value.class
+    end
   end
 end