Bug Fix - #252

- Fixed bug that prevented using end.after: and end.before: together
  to effect a range.
- Required differentiation between positive and negative attribute
  modifiers, and special handling.

src/Att.cpp

@@ -407,6 +407,17 @@ std::string Att::type (const std::string& name) const
     return "text";
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// The type of an attribute is useful for modifier evaluation.
+std::string Att::modType (const std::string& name) const
+{
+  if (name == "hasnt" ||
+      name == "isnt")
+    return "negative";
+
+  return "positive";
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 //
 // start --> name --> . --> mod --> : --> " --> value --> " --> end
@@ -461,7 +472,7 @@ void Att::parse (Nibbler& n)
   else
     throw std::string ("Missing : after attribute name"); // TODO i18n
 
-/* TODO This might be too slow to include.  Test.
+/* TODO This might be too slow to include.  Test this assumption.
   validNameValue (mName, mMod, mValue);
 */
 }