Experimental parser: split and rename some files

tools/lexer_generator/nfa.py

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-from transition_keys import TransitionKey
+from transition_key import TransitionKey
 from automaton import *
 
 class NfaState(AutomatonState):
 
   def __init__(self):
     super(NfaState, self).__init__()
     self.__transitions = {}
     self.__unclosed = set()
     self.__epsilon_closure = None
     self.__action = Action.empty_action()
@@ skipping 137 matching lines @@
       f = lambda state: state.transition_state_iter_for_key(key)
       match_states = set(chain(*map(f, nfa_state_set)))
       transition_state = self.__to_dfa(match_states, dfa_nodes)
       dfa_nodes[name]['transitions'][key] = transition_state
     return name
 
   def compute_dfa(self):
     dfa_nodes = {}
     start_name = self.__to_dfa(set([self.__start]), dfa_nodes)
     return (start_name, dfa_nodes)