Experimental parser: add dfa path iterator

tools/lexer_generator/generator.py

Index: tools/lexer_generator/generator.py
diff --git a/tools/lexer_generator/generator.py b/tools/lexer_generator/generator.py
index 20668f9a75efdf3aa49d28b7d3393b03165ddc35..f69b5eddfa5565869a860147728f156cf3e97295 100644
--- a/tools/lexer_generator/generator.py
+++ b/tools/lexer_generator/generator.py
@@ -141,6 +141,7 @@ if __name__ == '__main__':
   parser.add_argument('--debug-code', action='store_true')
   parser.add_argument('--profile', action='store_true')
   parser.add_argument('--rule-html')
+  parser.add_argument('--count-paths', action='store_true')
   args = parser.parse_args()
 
   minimize_default = not args.no_minimize_default
@@ -168,6 +169,13 @@ if __name__ == '__main__':
         dfa.node_count(), mdfa.node_count())
     DfaMinimizer.set_verify(True)
 
+  if args.count_paths:
+    path_count = 0
+    print 'counting'
+    for path in rule_processor.default_automata().minimal_dfa().path_iter():
+      path_count += 1
+    print 'done', path_count
+
   html_file = args.html
   if html_file:
     html = generate_html(