Allow substitution of messages as variables in other messages.

grit/gather/skeleton_gatherer.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.
 
 '''A baseclass for simple gatherers that store their gathered resource in a
 list.
 '''
 
 import re
@@ skipping 107 matching lines @@
     if chunk == '':
       return
 
     unescaped_text = self.UnEscape(chunk)
     if self.single_message_:
       self.single_message_.AppendText(unescaped_text)
     else:
       self.skeleton_.append(self.uberclique.MakeClique(
         tclib.Message(text=unescaped_text)))
       self.translatable_chunk_ = True
+
+  def SubstituteMessages(self, substituter):
+    '''Applies substitutions to all messages in the tree.
+
+    Goes through the skeleton and finds all MessageCliques.
+
+    Args:
+      substituter: a grit.util.Substituter object.
+    '''
+    if self.single_message_:
+      self.single_message_ = substituter.SubstituteMessage(self.single_message_)
+    new_skel = []
+    for chunk in self.skeleton_:
+      if isinstance(chunk, clique.MessageClique):
+        old_message = chunk.GetMessage()
+        new_message = substituter.SubstituteMessage(old_message)
+        if new_message is not old_message:
+          new_skel.append(self.uberclique.MakeClique(new_message))
+          continue
+      new_skel.append(chunk)
+    self.skeleton_ = new_skel