cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/PRESUBMIT.py

 # Copyright (c) 2012 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.
 
 """Top-level presubmit script for cc.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
@@ skipping 128 matching lines @@
     if ('FIX'+'ME') in contents:
       errors.append(f.LocalPath())
 
   if errors:
     return [output_api.PresubmitError(
       'All TODO comments should be of the form TODO(name). ' +
       'Use TODO instead of FIX' + 'ME',
       items=errors)]
   return []
 
+def CheckScopedPtr(input_api, output_api,
+                   white_list=CC_SOURCE_FILES, black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+  errors = []
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    for line_number, line in f.ChangedContents():
+      # Disallow:
+      # return scoped_ptr<T>(foo);
+      # bar = scoped_ptr<T>(foo);
+      # But allow:
+      # return scoped_ptr<T[]>(foo);
+      # bar = scoped_ptr<T[]>(foo);
+      if re.search(r'(=|\breturn)\s*scoped_ptr<[^>]*[^>\]]>\([^)]+\)', line):

[enne (OOO), 2014/09/26 16:58:22]

regex nits:

matching non-greedily, [^>]*> is clearer as .*?>
don't end with a character, [^.\]] could just be (?<!])

+        errors.append(output_api.PresubmitError(
+          ('%s:%d uses explicit scoped_ptr constructor. ' +
+           'Use make_scoped_ptr() instead.') % (f.LocalPath(), line_number)))
+      # Disallow:
+      # return scoped_ptr<T>();
+      # bar = scoped_ptr<T>();
+      if re.search(r'(=|\breturn)\s*scoped_ptr<[^>+]>\(\)', line):

[vmpstr, 2014/09/26 16:44:23]

... [^>]+ ...

?

[danakj, 2014/09/26 16:56:44]

That matches the T in scoped_ptr<T>

It doesn't handle scoped_ptr<T<U>> though.. if we care.

[enne (OOO), 2014/09/26 16:58:22]

I think this is wrong; did you intend for the + to be outside of the [] here?
Also, this could probably just be scoped_ptr<.*?> as well.

+        errors.append(output_api.PresubmitError(
+          '%s:%d uses scoped_ptr<T>(). Use nullptr instead.' %
+          (f.LocalPath(), line_number)))
+  return errors
+
 def FindUnquotedQuote(contents, pos):
   match = re.search(r"(?<!\\)(?P<quote>\")", contents[pos:])
   return -1 if not match else match.start("quote") + pos
 
 def FindUselessIfdefs(input_api, output_api):
   errors = []
   source_file_filter = lambda x: x
   for f in input_api.AffectedSourceFiles(source_file_filter):
     contents = input_api.ReadFile(f, 'rb')
     if re.search(r'#if\s*0\s', contents):
@@ skipping 120 matching lines @@
   else:
     return []
 
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results += CheckAsserts(input_api, output_api)
   results += CheckStdAbs(input_api, output_api)
   results += CheckPassByValue(input_api, output_api)
   results += CheckChangeLintsClean(input_api, output_api)
   results += CheckTodos(input_api, output_api)
+  results += CheckScopedPtr(input_api, output_api)
   results += CheckNamespace(input_api, output_api)
   results += CheckForUseOfWrongClock(input_api, output_api)
   results += FindUselessIfdefs(input_api, output_api)
   results += input_api.canned_checks.CheckPatchFormatted(input_api, output_api)
   return results
 
 def GetPreferredTryMasters(project, change):
   return {
     'tryserver.blink': {
       'linux_blink_rel': set(['defaulttests']),
     },
     'tryserver.chromium.gpu': {
       'linux_gpu': set(['defaulttests']),
       'mac_gpu': set(['defaulttests']),
       'win_gpu': set(['defaulttests']),
     },
   }