Simplify objects passed to the result stage

expect_tests/handle_list.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from expect_tests.type_definitions import Handler
+from expect_tests.type_definitions import Handler, Test, MultiTest
 
 
 class ListHandler(Handler):
   """List all of the tests instead of running them."""
   SKIP_RUNLOOP = True
 
   # Used to collect all bare test names for command line test name completion.
   COMPLETION_LIST = None
 
   class ResultStageHandler(Handler.ResultStageHandler):
     @staticmethod
-    def handle_Test(test):
+    def handle_TestInfo(test):
       if ListHandler.COMPLETION_LIST is not None:
         ListHandler.COMPLETION_LIST.append(test.name)
       else:
         print test.name
 
     @staticmethod
-    def handle_MultiTest(multi_test):
-      print 'MultiTest(%r, atomic=%r)' % (multi_test.name, multi_test.atomic)
+    def handle_MultiTestInfo(multi_test):
+      print 'MultiTestInfo(%r, atomic=%r)' % (
+        multi_test.name, multi_test.atomic)
       for test in multi_test.tests:
         if ListHandler.COMPLETION_LIST is not None:
           ListHandler.COMPLETION_LIST.append(test.name)
         else:
           print '|', test.name
 
     # TODO(iannucci): group tests by dir?
     # TODO(iannucci): print more data about the test in verbose mode?
+
+  @classmethod
+  def gen_stage_loop(cls, _opts, tests, put_next_stage, _put_result_stage):
+    """Called in the GenStage portion of the pipeline.
+
+    @param opts: Parsed CLI options
+    @param tests:
+        Iterable of type_definitions.Test or type_definitions.MultiTest
+        objects.
+    @param put_next_stage:
+        Function to push an object to the next stage of the pipeline (RunStage).
+        Note that you should push the item you got from |tests|, not the
+        subtests, in the case that the item is a MultiTest.
+    @param put_result_stage:
+        Function to push an object to the result stage of the pipeline.
+    """
+    for test in tests:
+      if isinstance(test, (Test, MultiTest)):
+        test = test.get_info()
+
+      else:
+        raise TypeError('ListHandler.gen_stage_loop cannot handle type %s'
+                        % test.__class__.__name__)
+      put_next_stage(test)