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/*
* Created by Phil Nash on 8/8/2017.
* Copyright 2017 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_DECOMPOSER_H_INCLUDED
#define TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED
#include "catch_tostring.h"
#include "catch_stringref.h"
#include <ostream>
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4389) // '==' : signed/unsigned mismatch
#pragma warning(disable:4018) // more "signed/unsigned mismatch"
#pragma warning(disable:4312) // Converting int to T* using reinterpret_cast (issue on x64 platform)
#endif
namespace Catch {
struct ITransientExpression {
virtual auto isBinaryExpression() const -> bool = 0;
virtual auto getResult() const -> bool = 0;
virtual void streamReconstructedExpression( std::ostream &os ) const = 0;
// We don't actually need a virtual destructore, but many static analysers
// complain if it's not here :-(
virtual ~ITransientExpression() = default;
};
void formatReconstructedExpression( std::ostream &os, std::string const& lhs, std::string const& op, std::string const& rhs );
template<typename LhsT, typename RhsT>
class BinaryExpr : public ITransientExpression {
bool m_result;
LhsT m_lhs;
std::string m_op;
RhsT m_rhs;
auto isBinaryExpression() const -> bool override { return true; }
auto getResult() const -> bool override { return m_result; }
void streamReconstructedExpression( std::ostream &os ) const override {
formatReconstructedExpression
( os, Catch::Detail::stringify( m_lhs ), m_op, Catch::Detail::stringify( m_rhs ) );
}
public:
BinaryExpr( bool comparisionResult, LhsT lhs, StringRef op, RhsT rhs )
: m_result( comparisionResult ),
m_lhs( lhs ),
m_op( op ),
m_rhs( rhs )
{}
};
template<typename LhsT>
class UnaryExpr : public ITransientExpression {
LhsT m_lhs;
auto isBinaryExpression() const -> bool override { return false; }
auto getResult() const -> bool override { return m_lhs ? true : false; }
void streamReconstructedExpression( std::ostream &os ) const override {
os << Catch::Detail::stringify( m_lhs );
}
public:
UnaryExpr( LhsT lhs ) : m_lhs( lhs ) {}
};
// Specialised comparison functions to handle equality comparisons between ints and pointers (NULL deduces as an int)
template<typename LhsT, typename RhsT>
auto compareEqual( LhsT const& lhs, RhsT&& rhs ) -> bool { return const_cast<LhsT&>( lhs ) == rhs; };
template<typename T>
auto compareEqual( T* const& lhs, int rhs ) -> bool { return lhs == reinterpret_cast<void const*>( rhs ); };
template<typename T>
auto compareEqual( T* const& lhs, long rhs ) -> bool { return lhs == reinterpret_cast<void const*>( rhs ); };
template<typename T>
auto compareEqual( int lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) == rhs; };
template<typename T>
auto compareEqual( long lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) == rhs; };
template<typename LhsT, typename RhsT>
auto compareNotEqual( LhsT const& lhs, RhsT&& rhs ) -> bool { return const_cast<LhsT&>( lhs ) != rhs; };
template<typename T>
auto compareNotEqual( T* const& lhs, int rhs ) -> bool { return lhs != reinterpret_cast<void const*>( rhs ); };
template<typename T>
auto compareNotEqual( T* const& lhs, long rhs ) -> bool { return lhs != reinterpret_cast<void const*>( rhs ); };
template<typename T>
auto compareNotEqual( int lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) != rhs; };
template<typename T>
auto compareNotEqual( long lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) != rhs; };
template<typename LhsT>
class ExprLhs {
LhsT m_lhs;
public:
ExprLhs( LhsT lhs ) : m_lhs( lhs ) {}
template<typename RhsT>
auto operator == ( RhsT&& rhs ) -> BinaryExpr<LhsT, RhsT&> const {
return BinaryExpr<LhsT, RhsT&>( compareEqual( m_lhs, rhs ), m_lhs, "==", rhs );
}
auto operator == ( bool rhs ) -> BinaryExpr<LhsT, bool> const {
return BinaryExpr<LhsT, bool>( m_lhs == rhs, m_lhs, "==", rhs );
}
template<typename RhsT>
auto operator != ( RhsT&& rhs ) -> BinaryExpr<LhsT, RhsT&> const {
return BinaryExpr<LhsT, RhsT&>( compareNotEqual( m_lhs, rhs ), m_lhs, "!=", rhs );
}
auto operator != ( bool rhs ) -> BinaryExpr<LhsT, bool> const {
return BinaryExpr<LhsT, bool>( m_lhs != rhs, m_lhs, "!=", rhs );
}
template<typename RhsT>
auto operator > ( RhsT&& rhs ) -> BinaryExpr<LhsT, RhsT&> const {
return BinaryExpr<LhsT, RhsT&>( m_lhs > rhs, m_lhs, ">", rhs );
}
template<typename RhsT>
auto operator < ( RhsT&& rhs ) -> BinaryExpr<LhsT, RhsT&> const {
return BinaryExpr<LhsT, RhsT&>( m_lhs < rhs, m_lhs, "<", rhs );
}
template<typename RhsT>
auto operator >= ( RhsT&& rhs ) -> BinaryExpr<LhsT, RhsT&> const {
return BinaryExpr<LhsT, RhsT&>( m_lhs >= rhs, m_lhs, ">=", rhs );
}
template<typename RhsT>
auto operator <= ( RhsT&& rhs ) -> BinaryExpr<LhsT, RhsT&> const {
return BinaryExpr<LhsT, RhsT&>( m_lhs <= rhs, m_lhs, "<=", rhs );
}
auto makeUnaryExpr() const -> UnaryExpr<LhsT> {
return UnaryExpr<LhsT>( m_lhs );
}
};
void handleExpression( ITransientExpression const& expr );
template<typename T>
void handleExpression( ExprLhs<T> const& expr ) {
handleExpression( expr.makeUnaryExpr() );
}
struct Decomposer {
template<typename T>
auto operator <= ( T& lhs ) -> ExprLhs<T&> {
return ExprLhs<T&>( lhs );
}
template<typename T>
auto operator <= ( T const& lhs ) -> ExprLhs<T const&> {
return ExprLhs<T const&>( lhs );
}
auto operator <=( bool value ) -> ExprLhs<bool> {
return ExprLhs<bool>( value );
}
};
} // end namespace Catch
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#endif // TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED
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