Experimental parser: use Terms instead of tuples

tools/lexer_generator/transition_key_test.py

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 48 matching lines @@
     classes = {}
     encoding = self.__encoding
     for (string, match, no_match) in data:
       for invert in [False, True]:
         if invert:
           regex = "[^%s]" % string
           token = "NOT_CLASS"
         else:
           regex = "[%s]" % string
           token = "CLASS"
-        graph = RegexParser.parse(regex)
-        assert graph[0] == token
-        key = TransitionKey.character_class(encoding, graph, classes)
+        term = RegexParser.parse(regex)
+        assert term.name() == token
+        key = TransitionKey.character_class(encoding, term, classes)
         for c in match:
           self.assertEqual(invert, not key.matches_char(c))
         for c in no_match:
           self.assertEqual(invert, key.matches_char(c))
 
   def test_self_defined_classes(self):
     encoding = self.__encoding
     graph = RegexParser.parse("[a-z]")
     classes = {
       'self_defined' : TransitionKey.character_class(encoding, graph, {})}
     graph = RegexParser.parse("[^:self_defined:]")
     key = TransitionKey.character_class(encoding, graph, classes)
     self.assertTrue(key.matches_char('A'))
 
   def test_disjoint_keys(self):
     encoding = self.__encoding
     key1 = TransitionKey(encoding, [(1, 10)])
     key2 = TransitionKey(encoding, [(5, 15)])
     disjoint_set = TransitionKey.disjoint_keys(encoding, set([key1, key2]))
     self.assertTrue(TransitionKey(encoding, [(1, 4)]) in disjoint_set)
     self.assertTrue(TransitionKey(encoding, [(5, 10)]) in disjoint_set)
     self.assertTrue(TransitionKey(encoding, [(11, 15)]) in disjoint_set)