Added a policy writer for iOS Plists.

grit/format/policy_templates/writers/xml_formatted_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.
 
 
 from grit.format.policy_templates.writers import template_writer
 
 
 class XMLFormattedWriter(template_writer.TemplateWriter):
@@ skipping 35 matching lines @@
 
   def AddAttribute(self, parent, name, value):
     '''Adds a new attribute to the parent Element. If an attribute with the
     given name already exists then it will be replaced.
     '''
     doc = parent.ownerDocument
     attribute = doc.createAttribute(name)
     attribute.value = value
     parent.setAttributeNode(attribute)
 
-  def ToPrettyXml(self, doc):
+  def AddComment(self, parent, comment):
+    '''Adds a comment node.'''
+    parent.appendChild(parent.ownerDocument.createComment(comment))
+
+  def ToPrettyXml(self, doc, **kwargs):
     # return doc.toprettyxml(indent='  ')
     # The above pretty-printer does not print the doctype and adds spaces
     # around texts, e.g.:
     #  <string>
     #    value of the string
     #  </string>
     # This is problematic both for the OSX Workgroup Manager (plist files) and
     # the Windows Group Policy Editor (admx files). What they need instead:
     #  <string>value of string</string>
     # So we use the poor man's pretty printer here. It assumes that there are
     # no mixed-content nodes.
     # Get all the XML content in a one-line string.
-    xml = doc.toxml()
+    xml = doc.toxml(**kwargs)
     # Determine where the line breaks will be. (They will only be between tags.)
     lines = xml[1:len(xml) - 1].split('><')
     indent = ''
     res = ''
     # Determine indent for each line.
     for i, line in enumerate(lines):
       if line[0] == '/':
         # If the current line starts with a closing tag, decrease indent before
         # printing.
         indent = indent[2:]
       lines[i] = indent + '<' + line + '>'
       if (line[0] not in ['/', '?', '!'] and '</' not in line and
           line[len(line) - 1] != '/'):
         # If the current line starts with an opening tag and does not conatin a
         # closing tag, increase indent after the line is printed.
         indent += '  '
     # Reconstruct XML text from the lines.
     return '\n'.join(lines)