Catch/include/internal/catch_exception_translator_registry.hpp

/*
 *  Created by Phil on 20/04/2011.
 *  Copyright 2011 Two Blue Cubes Ltd. All rights reserved.
 *
 *  Distributed under the Boost Software License, Version 1.0. (See accompanying
 *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 */
#ifndef TWOBLUECUBES_CATCH_EXCEPTION_TRANSLATOR_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_EXCEPTION_TRANSLATOR_HPP_INCLUDED

#include "catch_interfaces_exception.h"

#ifdef __OBJC__
#import "Foundation/Foundation.h"
#endif

namespace Catch {

    class ExceptionTranslatorRegistry : public IExceptionTranslatorRegistry {

        ~ExceptionTranslatorRegistry() {
            deleteAll( m_translators );
        }

        virtual void registerTranslator( IExceptionTranslator* translator ) {
            m_translators.push_back( translator );
        }
        
        virtual std::string translateActiveException() const {
            try {
#ifdef __OBJC__
                // In Objective-C try objective-c exceptions first
                @try {
                    throw;
                }
                @catch (NSException *exception) {
                    return toString( [exception description] );
                }
#else
                throw;
#endif
            }
            catch( std::exception& ex ) {
                return ex.what();
            }
            catch( std::string& msg ) {
                return msg;
            }
            catch( const char* msg ) {
                return msg;
            }
            catch(...) {
                return tryTranslators( m_translators.begin() );
            }
        }
        
        std::string tryTranslators( std::vector<IExceptionTranslator*>::const_iterator it ) const {
            if( it == m_translators.end() )
                return "Unknown exception";
            
            try {
                return (*it)->translate();
            }
            catch(...) {
                return tryTranslators( it+1 );
            }
        }
        
    private:
        std::vector<IExceptionTranslator*> m_translators;
    };
}

#endif // TWOBLUECUBES_CATCH_EXCEPTION_TRANSLATOR_HPP_INCLUDED