Adding warning for missing Label.

ppapi/generators/idl_lint.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.
 
 """ Lint for IDL """
 
 import os
 import sys
 
 from idl_log import ErrOut, InfoOut, WarnOut
@@ skipping 25 matching lines @@
 
   def Arrive(self, node, errors):
     __pychecker__ = 'unusednames=node,errors'
     warnings = 0
     if node.IsA('Interface', 'Member', 'Struct', 'Enum', 'EnumItem', 'Typedef'):
       comments = node.GetListOf('Comment')
       if not comments and not node.GetProperty('wcomment'):
         node.Warning('Expecting a comment.')
         warnings += 1
 
+    if node.IsA('File'):
+      labels = node.GetListOf('Label')
+      interfaces = node.GetListOf('Interface')
+      if interfaces and not labels:
+        node.Warning('Expecting a label in a file containing interfaces.')
+
     if node.IsA('Struct', 'Typedef') and not node.GetProperty('wpass'):
       if node.GetProperty('passByValue'):
         pbv = 'is'
       else:
         pbv = 'is not'
       if node.GetProperty('returnByValue'):
         ret = 'is'
       else:
         ret = 'is not'
       if pbv != ret:
@@ skipping 51 matching lines @@
   for filenode in ast.GetListOf('File'):
     name = filenode.GetProperty('NAME')
     if filenode.GetProperty('ERRORS') > 0:
       ErrOut.Log('%s : Skipped due to errors.' % name)
       skipList.append(filenode)
       continue
     warnings = IDLLinter().Visit(filenode, 0)
     if warnings:
       WarnOut.Log('%s warning(s) for %s\n' % (warnings, name))
   return skipList