Experimental lexer generator: unbreak dot output after harmony stuff.

tools/lexer_generator/automaton.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 62 matching lines @@
     return (isinstance(other, self.__class__) and
             self.__entry_action == other.__entry_action and
             self.__match_action == other.__match_action)
 
   def __str__(self):
     parts = []
     for action in [self.__entry_action, self.__match_action]:
       part = ""
       if action:
         part += action[0]
-        if action[1]:
+        if action[1] and isinstance(action[1], str):
           part += "(%s)" % action[1]
       parts.append(part)
     return "action< %s >" % " | ".join(parts)
 
 class AutomatonState(object):
 
   __node_number_counter = 0
 
   def __init__(self):
     self.__node_number = AutomatonState.__node_number_counter
@@ skipping 147 matching lines @@
   node [shape = doublecircle, style=unfilled]; %s
   node [shape = circle];
 %s
 %s
 }
     ''' % (start_shape,
            start_number,
            " ".join(terminals),
            "\n".join(edge_content),
            "\n".join(node_content))