Parser generator: more layering refactoring

tools/lexer_generator/lexer_test.py

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 import unittest
-from generator import Generator
+from rule_parser import RuleProcessor
 
 class LexerTestCase(unittest.TestCase):
 
   def __verify_action_stream(self, rules, string, expected_stream):
     expected_stream.append(('terminate', '\0'))
-    for i, (action, start, stop) in enumerate(Generator(rules).lex(string)):
+    rule_processor = RuleProcessor.parse(rules)
+    for i, (action, start, stop) in enumerate(rule_processor.lex(string)):
       self.assertEquals(expected_stream[i][0], action)
       self.assertEquals(expected_stream[i][1], string[start : stop])
 
   def test_simple(self):
     rules = '''
     <default>
     "("           { LBRACE }
     ")"           { RBRACE }
 
     "foo"         { FOO }
@@ skipping 18 matching lines @@
   def test_consecutive_epsilon_transitions(self):
     rules = '''
     digit = [0-9];
     number = (digit+ ("." digit+)?);
     <default>
     number        { NUMBER }
     eof           <<terminate>>'''
 
     string = '555\0'
     self.__verify_action_stream(rules, string, [('NUMBER', '555')])