Experimental parser: add embedded actions

tools/lexer_generator/transition_keys.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 221 matching lines @@
             r != TransitionKey.__unicode_literal_bounds):
         last = (last[0], r[1])
       else:
         merged.append(last)
         last = r
     if last != None:
       merged.append(last)
     return merged
 
   @staticmethod
+  def merged_key(keys):
+    f = lambda acc, key: acc + list(key.__ranges)
+    return TransitionKey.__key_from_ranges(False, reduce(f, keys, []))
+
+  @staticmethod
   def __invert_ranges(ranges):
     inverted = []
     last = None
     contains_whitespace = False
     contains_literal = False
     for r in ranges:
       if r == TransitionKey.__unicode_whitespace_bounds:
         contains_whitespace = True
         continue
       if r == TransitionKey.__unicode_literal_bounds:
         contains_literal = True
         continue
       if last == None:
         if r[0] != TransitionKey.__lower_bound:
           inverted.append((TransitionKey.__lower_bound, r[0] - 1))
       elif last[1] + 1 < r[0]:
         inverted.append((last[1] + 1, r[0] - 1))
       last = r
     if last != None and last[1] < TransitionKey.__latin_1_upper_bound:
       inverted.append((last[1] + 1, TransitionKey.__latin_1_upper_bound))
     if not contains_whitespace:
       inverted.append(TransitionKey.__unicode_whitespace_bounds)
     if not contains_literal:
       inverted.append(TransitionKey.__unicode_literal_bounds)
     return inverted