If-then-else support for GRIT

grit/node/mapping.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.
 
 '''Maps each node type to an implementation class.
 When adding a new node type, you add to this mapping.
 '''
 
 
@@ skipping 15 matching lines @@
   'outputs'       : empty.OutputsNode,
   'structures'    : empty.StructuresNode,
   'translations'  : empty.TranslationsNode,
   'include'       : include.IncludeNode,
   'emit'          : io.EmitNode,
   'file'          : io.FileNode,
   'output'        : io.OutputNode,
   'ex'            : message.ExNode,
   'message'       : message.MessageNode,
   'ph'            : message.PhNode,
+  'else'          : misc.ElseNode,
   'grit'          : misc.GritNode,
   'identifier'    : misc.IdentifierNode,
   'if'            : misc.IfNode,
   'part'          : misc.PartNode,
   'release'       : misc.ReleaseNode,
+  'then'          : misc.ThenNode,
   'structure'     : structure.StructureNode,
   'skeleton'      : variant.SkeletonNode,
 }
 
 
 def ElementToClass(name, typeattr):
   '''Maps an element to a class that handles the element.
 
   Args:
     name: 'element' (the name of the element)
     typeattr: 'type' (the value of the type attribute, if present, else None)
 
   Return:
     type
   '''
   if name not in _ELEMENT_TO_CLASS:
     raise exception.UnknownElement()
   return _ELEMENT_TO_CLASS[name]