1 files changed, 14 insertions, 9 deletions
diff --git a/src/front/token.py b/src/front/token.py
index 4cf646a..31159bf 100644
--- a/src/front/token.py
+++ b/src/front/token.py
@@ -1,7 +1,9 @@
 # -*- coding: utf-8 -*-
 # date: 20 Mai 2009
 
-class Tag:
+class Tag(object):
+    __slots__ = ["name"]
+
     def __init__(self, name):
         self.name = name
 
@@ -52,23 +54,26 @@ Tag.RETURN      = Tag("RETURN")
 Tag.ASSIGN      = Tag("ASSIGN")
 Tag.FUNCTION    = Tag("FUNCTION")
 
-class Token:
-    tag = None
+class Token(object):
+    __slots__ = ["tag"]
 
     def __init__(self, tag):
         self.tag = tag
-        return
 
     def __repr__(self):
         return "<Token: %s>" % self.tag
 
-class ValueToken(Token):
-    value = None
+class LeafToken(Token):
+    __slots__ = ["value"]
 
-    def __init__(self, tag, value):
+    def __init__(self, tag, value = None):
         Token.__init__(self, tag)
         self.value = value
-        return
 
     def __repr__(self):
-        return "<Token: %s, Value: %s>" % (self.tag, self.value.__str__())
+        if self.value:
+            return "<LeafToken: %s, Value: %s>" % (self.tag, self.value.__str__())
+        return "<LeafToken: %s>" % self.tag
+
+class NodeToken(Token):
+    pass