Experimental parser: split and rename some files

tools/lexer_generator/test/rule_parser_test.py

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 import unittest
-from lexer_generator.transition_keys import KeyEncoding
+from lexer_generator.transition_key import KeyEncoding
 from lexer_generator.rule_parser import RuleParserState, RuleParser
 from lexer_generator.regex_parser import RegexParser
 
 class RuleParserTestCase(unittest.TestCase):
 
    def setUp(self):
      self.state = RuleParserState(KeyEncoding.get('latin1'))
 
    def parse(self, string):
     return RuleParser.parse(string, self.state)
@@ skipping 25 matching lines @@
    def test_more_complicated(self):
      self.parse('''
 alias = "regex;with;semicolon";
 <<cond1>> "regex3}with}braces}" <|body|>
 <<cond1>> "regex4{with{braces}" <body||>''')
 
      self.assertEquals(self.state.aliases['alias'],
                        RegexParser.parse("regex;with;semicolon"))
      self.assertTrue('cond1' in self.state.rules)
      self.assertEquals(len(self.state.rules['cond1']['trees']), 2)