Expressions

- Added Expression::eval short-circuit.
- Added int/number exlclusions for Nibbler::getDOM.
- Added Variant::boolean for exatracting filter results.

src/Variant.cpp

@@ -852,4 +852,12 @@ void Variant::promote (Variant& lhs, Variant& rhs)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// Casts to boolean and returns the value.  Used to evaluating expression
+// results.
+bool Variant::boolean ()
+{
+  cast (v_boolean);
+  return mBool;
+}
 
+////////////////////////////////////////////////////////////////////////////////