catch2/internal/catch_capture.hpp

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/*
* catch_capture.hpp
* Catch
*
* Created by Phil on 18/10/2010.
* Copyright 2010 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_CAPTURE_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_CAPTURE_HPP_INCLUDED
#include "catch_resultinfo.hpp"
#include "catch_debugger.hpp"
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#include <sstream>
#include <cmath>
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namespace Catch
{
namespace Detail
{
// The following code, contributed by Sam Partington, allows us to choose an implementation
// of toString() depending on whether a << overload is available
struct NonStreamable
{
// allow construction from anything...
template<typename Anything>
NonStreamable(Anything)
{}
};
// a local operator<< which may be called if there isn't a better one elsewhere...
inline NonStreamable operator << ( std::ostream&, const NonStreamable& ns )
{
return ns;
}
template<typename T>
struct IsStreamable
{
static NoType Deduce( const NonStreamable& );
static YesType Deduce( std::ostream& );
enum
{
value = sizeof( Deduce( Synth<std::ostream&>() << Synth<const T&>() ) )
== sizeof( YesType )
};
};
// << is available, so use it with ostringstream to make the string
template<typename T, bool streamable>
struct StringMaker
{
static std::string apply( const T& value )
{
std::ostringstream oss;
oss << value;
return oss.str();
}
};
// << not available - use a default string
template<typename T>
struct StringMaker<T, false>
{
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static std::string apply( const T& )
{
return "{?}";
}
};
}// end namespace Detail
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template<typename T>
std::string toString( const T& value )
{
return Detail::StringMaker<T, Detail::IsStreamable<T>::value>::apply( value );
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}
class TestFailureException
{
};
class DummyExceptionType_DontUse
{
};
class MutableResultInfo : public ResultInfo
{
public:
MutableResultInfo()
{}
MutableResultInfo( const std::string& expr, bool isNot, const std::string& filename, std::size_t line, const std::string& macroName )
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: ResultInfo( ( isNot ? "!" : "" ) + expr, ResultWas::Unknown, isNot, filename, line, macroName )
{
}
void setResultType( ResultWas::OfType result )
{
// Flip bool results if isNot is set
if( m_isNot && result == ResultWas::Ok )
m_result = ResultWas::ExpressionFailed;
else if( m_isNot && result == ResultWas::ExpressionFailed )
m_result = ResultWas::Ok;
else
m_result = result;
}
void setMessage( const std::string& message )
{
m_message = message;
}
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template<typename RhsT>
MutableResultInfo& operator ||( const RhsT& )
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{
m_expressionIncomplete = true;
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return *this;
}
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private:
friend class ResultBuilder;
void setLhs( const std::string& lhs )
{
m_lhs = lhs;
}
MutableResultInfo& setRhs( const std::string& op, const std::string& rhs )
{
m_op = op;
m_rhs = rhs;
return *this;
}
};
class ResultBuilder
{
public:
ResultBuilder( const char* expr, bool isNot, const std::string& filename, std::size_t line, const std::string& macroName )
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: m_result( expr, isNot, filename, line, macroName )
{}
template<typename T>
ResultBuilder& operator->*(const T & operand)
{
m_result.setLhs( toString( operand ) );
return *this;
}
template<typename RhsT>
MutableResultInfo& operator == ( const RhsT& rhs )
{
return m_result.setRhs( "==", toString( rhs ) );
}
template<typename RhsT>
MutableResultInfo& operator != ( const RhsT& rhs )
{
return m_result.setRhs( "!=", toString( rhs ) );
}
template<typename RhsT>
MutableResultInfo& operator < ( const RhsT& rhs )
{
return m_result.setRhs( "<", toString( rhs ) );
}
template<typename RhsT>
MutableResultInfo& operator > ( const RhsT& rhs )
{
return m_result.setRhs( ">", toString( rhs ) );
}
template<typename RhsT>
MutableResultInfo& operator <= ( const RhsT& rhs )
{
return m_result.setRhs( "<=", toString( rhs ) );
}
template<typename RhsT>
MutableResultInfo& operator >= ( const RhsT& rhs )
{
return m_result.setRhs( ">=", toString( rhs ) );
}
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operator MutableResultInfo&()
{
return m_result;
}
private:
MutableResultInfo m_result;
};
struct ResultAction
{
enum Value
{
None,
Failed = 1, // Failure - but no debug break if Debug bit not set
DebugFailed = 3 // Indicates that the debugger should break, if possible
};
};
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class TestCaseInfo;
class ScopedInfo;
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struct IResultListener
{
virtual ~IResultListener(){}
virtual void testEnded( const ResultInfo& result ) = 0;
virtual bool sectionStarted( const std::string& name, const std::string& description, std::size_t& successes, std::size_t& failures ) = 0;
virtual void sectionEnded( const std::string& name, std::size_t successes, std::size_t failures ) = 0;
virtual void pushScopedInfo( ScopedInfo* scopedInfo ) = 0;
virtual void popScopedInfo( ScopedInfo* scopedInfo ) = 0;
virtual bool shouldDebugBreak() const = 0;
virtual ResultAction::Value acceptResult( bool result ) = 0;
virtual ResultAction::Value acceptResult( ResultWas::OfType result ) = 0;
virtual void acceptExpression( const MutableResultInfo& resultInfo ) = 0;
virtual void acceptMessage( const std::string& msg ) = 0;
};
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class ResultsCapture
{
private:
ResultsCapture()
: m_listener( 0 )
{
}
static ResultsCapture& instance()
{
static ResultsCapture instance;
return instance;
}
public:
static IResultListener* setListener( IResultListener* listener )
{
IResultListener* prevListener = instance().m_listener;
instance().m_listener = listener;
return prevListener;
}
static IResultListener& getListener()
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{
return *instance().m_listener;
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}
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private:
IResultListener* m_listener;
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};
class ScopedInfo
{
public:
ScopedInfo()
{
ResultsCapture::getListener().pushScopedInfo( this );
}
~ScopedInfo()
{
ResultsCapture::getListener().popScopedInfo( this );
}
ScopedInfo& operator << ( const char* str )
{
m_oss << str;
return *this;
}
std::string getInfo() const
{
return m_oss.str();
}
private:
std::ostringstream m_oss;
};
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// !TBD Need to clean this all up
#define CATCH_absTol 1e-10
#define CATCH_relTol 1e-10
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inline double catch_max( double x, double y )
{
return x > y ? x : y;
}
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class Approx
{
public:
// !TBD more generic
Approx( double d )
: m_d( d )
{
}
template<typename T>
friend bool operator == ( const T& lhs, const Approx& rhs )
{
// !TBD Use proper tolerance
// From: http://realtimecollisiondetection.net/blog/?p=89
// see also: http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
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return fabs( lhs - rhs.m_d ) <= catch_max( CATCH_absTol, CATCH_relTol * catch_max( fabs(lhs), fabs(rhs.m_d) ) );
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}
template<typename T>
friend bool operator != ( const T& lhs, const Approx& rhs )
{
return ! operator==( lhs, rhs );
}
double m_d;
};
template<>
inline std::string toString<Approx>( const Approx& value )
{
std::ostringstream oss;
oss << "Approx( " << value.m_d << ")";
return oss.str();
}
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// This is just here to avoid compiler warnings with macro constants
inline bool isTrue( bool value )
{
return value;
}
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} // end namespace Catch
#define INTERNAL_CATCH_ACCEPT_RESULT( result, stopOnFailure ) \
if( Catch::ResultAction::Value action = Catch::ResultsCapture::getListener().acceptResult( result ) ) \
{ \
if( action == Catch::ResultAction::DebugFailed ) DebugBreak(); \
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if( Catch::isTrue( stopOnFailure ) ) throw Catch::TestFailureException(); \
}
#define INTERNAL_CATCH_TEST( expr, isNot, stopOnFailure, macroName ) \
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{ \
Catch::ResultsCapture::getListener().acceptExpression( Catch::ResultBuilder( #expr, isNot, __FILE__, __LINE__, macroName )->*expr ); \
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INTERNAL_CATCH_ACCEPT_RESULT( expr, stopOnFailure ) \
}
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#define INTERNAL_CATCH_THROWS( expr, exceptionType, nothrow, stopOnFailure, macroName ) \
Catch::ResultsCapture::getListener().acceptExpression( Catch::ResultBuilder( #expr, false, __FILE__, __LINE__, macroName ) ); \
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try \
{ \
expr; \
INTERNAL_CATCH_ACCEPT_RESULT( nothrow, stopOnFailure ) \
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} \
catch( exceptionType ) \
{ \
INTERNAL_CATCH_ACCEPT_RESULT( !(nothrow), stopOnFailure ) \
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}
#define INTERNAL_CATCH_THROWS_AS( expr, exceptionType, nothrow, stopOnFailure, macroName ) \
INTERNAL_CATCH_THROWS( expr, exceptionType, nothrow, stopOnFailure, macroName ) \
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catch( ... ) \
{ \
INTERNAL_CATCH_ACCEPT_RESULT( false, stopOnFailure ) \
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}
#define INTERNAL_CATCH_MSG( reason, resultType, stopOnFailure, macroName ) \
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{ \
std::ostringstream INTERNAL_CATCH_UNIQUE_NAME( strm ); \
INTERNAL_CATCH_UNIQUE_NAME( strm ) << reason; \
Catch::ResultsCapture::getListener().acceptExpression( Catch::MutableResultInfo( "", false, __FILE__, __LINE__, macroName ) ); \
Catch::ResultsCapture::getListener().acceptMessage( INTERNAL_CATCH_UNIQUE_NAME( strm ).str() ); \
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INTERNAL_CATCH_ACCEPT_RESULT( resultType, stopOnFailure ) \
}
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#define INTERNAL_CATCH_SCOPED_INFO( log ) Catch::ScopedInfo INTERNAL_CATCH_UNIQUE_NAME( info ); INTERNAL_CATCH_UNIQUE_NAME( info ) << log
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#endif // TWOBLUECUBES_CATCH_CAPTURE_HPP_INCLUDED