X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2FDEVEL%2Fmathml_editor%2Fsrc%2FCMathMLFactoryXSLT.cc;h=fddb24a580efcb18319ce53e124f6d0a6ec9bbcc;hb=c6b5e85cd64ca985f31685b6ffe7985fc7577bdb;hp=efc672c024cff05b4290bd73348a66a5d21de4ea;hpb=c112706f347e08e7f345131fbc4c3aa0e9ecc7b5;p=helm.git

diff --git a/helm/DEVEL/mathml_editor/src/CMathMLFactoryXSLT.cc b/helm/DEVEL/mathml_editor/src/CMathMLFactoryXSLT.cc
index efc672c02..fddb24a58 100644
--- a/helm/DEVEL/mathml_editor/src/CMathMLFactoryXSLT.cc
+++ b/helm/DEVEL/mathml_editor/src/CMathMLFactoryXSLT.cc
@@ -25,9 +25,11 @@
 
 #include "dom.hh"
 #include "TNode.hh"
+#include "ALogger.hh"
 #include "TDocument.hh"
 #include "CMathMLFactoryXSLT.hh"
 #include "AMathMLConsumer.hh"
+#include <cassert>
 
 CMathMLFactoryXSLT::CMathMLFactoryXSLT(ALogger& l, const DOMX::XSLTStylesheet& s)
   : AMathMLFactory(l), style(s)
@@ -49,20 +51,31 @@ CMathMLFactoryXSLT::documentModified(TDocument& doc)
   assert(res);
   style.save(doc.document(), stdout);
 
-  DOM::Element root = res.get_documentElement();
-  assert(root);
-
-  if (result.get_documentElement().hasAttribute("xref"))
-    {
-      bool ok = subst(result.get_documentElement(), root.getAttribute("xref"), result.importNode(root, true));
-      assert(ok);
+  if (DOM::Element root = res.get_documentElement())
+	  {
+      if (result.get_documentElement().hasAttribute("xref"))
+        {
+          bool ok = subst(result.get_documentElement(), root.getAttribute("xref"), result.importNode(root, true));
+          assert(ok);
+          doc.clearDirty();
+        }
+      else
+        result.replaceChild(result.importNode(root, true), result.get_documentElement());
+	  }
+	else
+		{
+			// Something wrong happened while applying the stylesheet.
+			DOM::Element root = result.get_documentElement();
+			DOM::Node p = root.get_firstChild();
+			while (p) {
+				DOM::Node next = p.get_nextSibling();
+				root.removeChild(p);
+				p = next;
+			}
+      logger.error("The stylesheet produced an empty document");
     }
-  else
-    result.replaceChild(result.importNode(root, true), result.get_documentElement());
 
   style.save(result, stdout);
-
-  doc.clearDirty();
 }
 
 bool