[msitools] wixl: two-stage visit for components

[Paolo Bonzini <pbonzini src gnome org>]

commit 42e457fb52a35893e4a63cce42774dbf6d2fb3d6
Author: Paolo Bonzini <pbonzini redhat com>
Date:   Fri Jan 25 09:16:03 2013 +0100

    wixl: two-stage visit for components

 tools/wixl/builder.vala |    4 +++-
 tools/wixl/wix.vala     |    5 +++--
 2 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/tools/wixl/builder.vala b/tools/wixl/builder.vala
index 43a8542..8b3d994 100644
--- a/tools/wixl/builder.vala
+++ b/tools/wixl/builder.vala
@@ -347,8 +347,10 @@ namespace Wixl {
                         buffer[12], buffer[13], buffer[14], buffer[15]);
         }
 
-        public override void visit_component (WixComponent comp) throws GLib.Error {
+        public override void visit_component (WixComponent comp, VisitState state) throws GLib.Error {
             var attr = 0;
+            if (state == VisitState.ENTER)
+                return;
 
             if (comp.key is WixRegistryValue)
                 attr |= ComponentAttribute.REGISTRY_KEY_PATH;
diff --git a/tools/wixl/wix.vala b/tools/wixl/wix.vala
index dee6947..a7cf3c9 100644
--- a/tools/wixl/wix.vala
+++ b/tools/wixl/wix.vala
@@ -37,7 +37,7 @@ namespace Wixl {
         public abstract void visit_property (WixProperty prop) throws GLib.Error;
         public abstract void visit_media (WixMedia media) throws GLib.Error;
         public abstract void visit_directory (WixDirectory dir) throws GLib.Error;
-        public abstract void visit_component (WixComponent comp) throws GLib.Error;
+        public abstract void visit_component (WixComponent comp, VisitState state) throws GLib.Error;
         public abstract void visit_feature (WixFeature feature, VisitState state) throws GLib.Error;
         public abstract void visit_component_ref (WixComponentRef ref) throws GLib.Error;
         public abstract void visit_remove_folder (WixRemoveFolder rm) throws GLib.Error;
@@ -995,8 +995,9 @@ namespace Wixl {
         public List<WixFeature> in_feature;
 
         public override void accept (WixNodeVisitor visitor) throws GLib.Error {
+            visitor.visit_component (this, VisitState.ENTER);
             base.accept (visitor);
-            visitor.visit_component (this);
+            visitor.visit_component (this, VisitState.LEAVE);
         }
     }