If-then-else support for GRIT

grit/node/empty.py

Index: grit/node/empty.py
diff --git a/grit/node/empty.py b/grit/node/empty.py
index 6bdb0ab1ca4cf5f0daffdc56b434f3e9d56a18e9..b3759a27cebcbfd7e7fa6829f2838aba264b0261 100644
--- a/grit/node/empty.py
+++ b/grit/node/empty.py
@@ -30,35 +30,35 @@ class GroupingNode(base.Node):
 class IncludesNode(GroupingNode):
   '''The <includes> element.'''
   def _IsValidChild(self, child):
-    return isinstance(child, (include.IncludeNode, misc.SplicingNode))
+    return isinstance(child, (include.IncludeNode, misc.IfNode, misc.PartNode))
 
 
 class MessagesNode(GroupingNode):
   '''The <messages> element.'''
   def _IsValidChild(self, child):
-    return isinstance(child, (message.MessageNode, misc.SplicingNode))
+    return isinstance(child, (message.MessageNode, misc.IfNode, misc.PartNode))
 
 
 class StructuresNode(GroupingNode):
   '''The <structures> element.'''
   def _IsValidChild(self, child):
-    return isinstance(child, (structure.StructureNode, misc.SplicingNode))
+    return isinstance(child, (structure.StructureNode,
+                              misc.IfNode, misc.PartNode))
 
 
 class TranslationsNode(base.Node):
   '''The <translations> element.'''
   def _IsValidChild(self, child):
-    return isinstance(child, (io.FileNode, misc.SplicingNode))
+    return isinstance(child, (io.FileNode, misc.IfNode, misc.PartNode))
 
 
 class OutputsNode(base.Node):
   '''The <outputs> element.'''
   def _IsValidChild(self, child):
-    return isinstance(child, (io.OutputNode, misc.SplicingNode))
+    return isinstance(child, (io.OutputNode, misc.IfNode, misc.PartNode))
 
 
 class IdentifiersNode(GroupingNode):
   '''The <identifiers> element.'''
   def _IsValidChild(self, child):
-    from grit.node import misc
     return isinstance(child, misc.IdentifierNode)