Improved TransformationFacade error handling

* ErrorHandler class created in 5859cb6 now caches all errors instead of pushing them to std::cerr
** cached errors are retrieved by TransformationFacade's "generate" member method
* test frontend pushes all errors to std::cerr
* FunctionTransform returns errors to the calling template as XML
** FunctionTransform test case demonstrates how one may test for successful transformation
* "generate" member method returns std::string vector wrapped in a std::unique_ptr
** this is used as a kind of optional pointer, as the std::unique_ptr instance only wraps a vector if errors where actually generated

1 files changed, 10 insertions, 2 deletions

diff --git a/test.cc b/test.cc
index 9d1dd3a..0c5e4b2 100644
--- a/test.cc
+++ b/test.cc
@@ -48,12 +48,20 @@ int main(int ac, char** av) {
 			plattform.getEntityResolver()
 		);
 
+		InputXSLT::TransformationFacade::return_type errors{};
+
 		if ( variables.count("target") ) {
-			return transformation.generate(
+			errors = transformation.generate(
 				variables["target"].as<std::string>()
 			);
 		} else {
-			return transformation.generate(std::cout);
+			errors = transformation.generate(std::cout);
+		}
+
+		if ( errors ) {
+			for ( auto&& error : *errors ) {
+				std::cerr << error << std::endl;
+			}
 		}
 	} else {
 		std::cout << optionDescription << std::endl;