Experimental lexer generator: make tests pass again + style fixes.

tools/lexer_generator/lexer_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 24 matching lines @@
     expected = map(lambda (action, s) : (Action(None, (action, None)), s), expected)
     expected.append((Action(None, ('terminate', None)), '\0'))
     automata = RuleProcessor.parse(rules).default_automata()
     for automaton in [automata.dfa(), automata.minimal_dfa()]:
         for i, (action, start, stop) in enumerate(automaton.lex(string)):
           self.assertEquals(expected[i][0], action)
           self.assertEquals(expected[i][1], string[start : stop])
 
   def test_simple(self):
     rules = '''
+    eos = [:eos:];
     <<default>>
     "("           <|LBRACE|>
     ")"           <|RBRACE|>
 
     "foo"         <|FOO|>
-    eof           <|terminate|>'''
+    eos           <|terminate|>'''
 
-    string = 'foo()\0'
+    string = 'foo()'
     self.__verify_action_stream(rules, string,
         [('FOO', 'foo'), ('LBRACE', '('), ('RBRACE', ')')])
 
   def test_maximal_matching(self):
     rules = '''
+    eos = [:eos:];
     <<default>>
     "<"           <|LT|>
     "<<"          <|SHL|>
     " "           <|SPACE|>
-    eof           <|terminate|>'''
+    eos           <|terminate|>'''
 
-    string = '<< <\0'
+    string = '<< <'
     self.__verify_action_stream(rules, string,
         [('SHL', '<<'), ('SPACE', ' '), ('LT', '<')])
 
   def test_consecutive_epsilon_transitions(self):
     rules = '''
+    eos = [:eos:];
     digit = [0-9];
     number = (digit+ ("." digit+)?);
     <<default>>
     number        <|NUMBER|>
-    eof           <|terminate|>'''
+    eos           <|terminate|>'''
 
-    string = '555\0'
+    string = '555'
     self.__verify_action_stream(rules, string, [('NUMBER', '555')])