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, 11 insertions, 2 deletions

diff --git a/src/support/error_handler.h b/src/support/error_handler.h
index 7835292..77a46d8 100644
--- a/src/support/error_handler.h
+++ b/src/support/error_handler.h
@@ -3,21 +3,30 @@
 
 #include <xercesc/sax/ErrorHandler.hpp>
 
+#include <memory>
+#include <vector>
 #include <string>
 
 namespace InputXSLT {
 
 class ErrorHandler : public xercesc::ErrorHandler {
 	public:
-		ErrorHandler(const std::string&);
+		typedef std::vector<std::string> error_cache;
+		typedef std::unique_ptr<error_cache> error_cache_ptr;
+
+		ErrorHandler();
 
 		virtual void warning(const xercesc::SAXParseException&);
 		virtual void error(const xercesc::SAXParseException&);
 		virtual void fatalError(const xercesc::SAXParseException&);
 		virtual void resetErrors();
 
+		error_cache_ptr getCachedErrors();
+
 	private:
-		const std::string& transformation_path_;
+		error_cache_ptr error_cache_;
+
+		void constructErrorCache();
 
 };