Experimental parser: split and rename some files

tools/lexer_generator/test/transition_key_test.py

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 import unittest
-from lexer_generator.transition_keys import TransitionKey, KeyEncoding
+from lexer_generator.transition_key import TransitionKey, KeyEncoding
 from lexer_generator.regex_parser import RegexParser
 
 class TransitionKeyTestCase(unittest.TestCase):
 
   __encoding = KeyEncoding.get('latin1')
 
   __equal_pairs = [
     (TransitionKey.epsilon(), TransitionKey.epsilon()),
     (TransitionKey.any(__encoding), TransitionKey.any(__encoding)),
     (TransitionKey.single_char(__encoding, ord('a')),
@@ skipping 107 matching lines @@
     self.assertTrue(key.matches_char('A'))
 
   def test_disjoint_keys(self):
     encoding = self.__encoding
     key = lambda x, y: TransitionKey.range(encoding, x , y)
     disjoint_set = TransitionKey.disjoint_keys(encoding,
                                                [key(1, 10), key(5, 15)])
     self.assertTrue(key(1, 4) in disjoint_set)
     self.assertTrue(key(5, 10) in disjoint_set)
     self.assertTrue(key(11, 15) in disjoint_set)