Improve platform support indications for policy documentation.

grit/format/policy_templates/writers/template_writer.py

 #!/usr/bin/env python
 # 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.
 
 
 class TemplateWriter(object):
   '''Abstract base class for writing policy templates in various formats.
   The methods of this class will be called by PolicyTemplateGenerator.
   '''
@@ skipping 69 matching lines @@
     for supported_on in policy['supported_on']:
       for supported_on_platform in supported_on['platforms']:
         if supported_on_platform in self.platforms:
           return True
     return False
 
   def CanBeRecommended(self, policy):
     '''Checks if the given policy can be recommended.'''
     return policy.get('features', {}).get('can_be_recommended', False)
 
+  def IsPolicySupportedOnPlatform(self, policy, platform):
+    '''Checks if |policy| is supported on |platform|.
+
+    Args:
+      policy: The dictionary of the policy.
+      platform: The platform to check; one of 'win', 'mac', 'linux' or
+        'chrome_os'.
+    '''
+    is_supported = lambda x: platform in x['platforms']
+    return any(filter(is_supported, policy['supported_on']))
+
   def _GetPoliciesForWriter(self, group):
     '''Filters the list of policies in the passed group that are supported by
     the writer.
 
     Args:
       group: The dictionary of the policy group.
 
     Returns: The list of policies of the policy group that are compatible
       with the writer.
     '''
@@ skipping 178 matching lines @@
     '''
     is_group = policy['type'] == 'group'
     if is_group:
       # Groups are sorted by caption.
       str_key = policy['caption']
     else:
       # Regular policies are sorted by name.
       str_key = policy['name']
     # Groups come before regular policies.
     return (not is_group, str_key)