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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#include <catch2/internal/catch_enforce.hpp>
#include <catch2/internal/catch_stream.hpp>
#include <catch2/internal/catch_debug_console.hpp>
#include <catch2/internal/catch_stringref.hpp>
#include <catch2/internal/catch_singletons.hpp>
#include <catch2/internal/catch_unique_ptr.hpp>
#include <cstdio>
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
namespace Catch {
Catch::IStream::~IStream() = default;
namespace Detail {
namespace {
template<typename WriterF, std::size_t bufferSize=256>
class StreamBufImpl : public std::streambuf {
char data[bufferSize];
WriterF m_writer;
public:
StreamBufImpl() {
setp( data, data + sizeof(data) );
}
~StreamBufImpl() noexcept {
StreamBufImpl::sync();
}
private:
int overflow( int c ) override {
sync();
if( c != EOF ) {
if( pbase() == epptr() )
m_writer( std::string( 1, static_cast<char>( c ) ) );
else
sputc( static_cast<char>( c ) );
}
return 0;
}
int sync() override {
if( pbase() != pptr() ) {
m_writer( std::string( pbase(), static_cast<std::string::size_type>( pptr() - pbase() ) ) );
setp( pbase(), epptr() );
}
return 0;
}
};
///////////////////////////////////////////////////////////////////////////
struct OutputDebugWriter {
void operator()( std::string const& str ) {
if ( !str.empty() ) {
writeToDebugConsole( str );
}
}
};
///////////////////////////////////////////////////////////////////////////
class FileStream : public IStream {
mutable std::ofstream m_ofs;
public:
FileStream( std::string const& filename ) {
m_ofs.open( filename.c_str() );
CATCH_ENFORCE( !m_ofs.fail(), "Unable to open file: '" << filename << '\'' );
}
~FileStream() override = default;
public: // IStream
std::ostream& stream() const override {
return m_ofs;
}
};
///////////////////////////////////////////////////////////////////////////
class CoutStream : public IStream {
mutable std::ostream m_os;
public:
// Store the streambuf from cout up-front because
// cout may get redirected when running tests
CoutStream() : m_os( Catch::cout().rdbuf() ) {}
~CoutStream() override = default;
public: // IStream
std::ostream& stream() const override { return m_os; }
};
///////////////////////////////////////////////////////////////////////////
class DebugOutStream : public IStream {
Detail::unique_ptr<StreamBufImpl<OutputDebugWriter>> m_streamBuf;
mutable std::ostream m_os;
public:
DebugOutStream()
: m_streamBuf( Detail::make_unique<StreamBufImpl<OutputDebugWriter>>() ),
m_os( m_streamBuf.get() )
{}
~DebugOutStream() override = default;
public: // IStream
std::ostream& stream() const override { return m_os; }
};
} // unnamed namespace
} // namespace Detail
///////////////////////////////////////////////////////////////////////////
auto makeStream( std::string const& filename ) -> Detail::unique_ptr<IStream const> {
if ( filename.empty() || filename == "-" ) {
return Detail::make_unique<Detail::CoutStream>();
}
else if( filename[0] == '%' ) {
if( filename == "%debug" )
return Detail::make_unique<Detail::DebugOutStream>();
else
CATCH_ERROR( "Unrecognised stream: '" << filename << '\'' );
}
else
return Detail::make_unique<Detail::FileStream>( filename );
}
// This class encapsulates the idea of a pool of ostringstreams that can be reused.
struct StringStreams {
std::vector<Detail::unique_ptr<std::ostringstream>> m_streams;
std::vector<std::size_t> m_unused;
std::ostringstream m_referenceStream; // Used for copy state/ flags from
auto add() -> std::size_t {
if( m_unused.empty() ) {
m_streams.push_back( Detail::make_unique<std::ostringstream>() );
return m_streams.size()-1;
}
else {
auto index = m_unused.back();
m_unused.pop_back();
return index;
}
}
void release( std::size_t index ) {
m_streams[index]->copyfmt( m_referenceStream ); // Restore initial flags and other state
m_unused.push_back(index);
}
};
ReusableStringStream::ReusableStringStream()
: m_index( Singleton<StringStreams>::getMutable().add() ),
m_oss( Singleton<StringStreams>::getMutable().m_streams[m_index].get() )
{}
ReusableStringStream::~ReusableStringStream() {
static_cast<std::ostringstream*>( m_oss )->str("");
m_oss->clear();
Singleton<StringStreams>::getMutable().release( m_index );
}
std::string ReusableStringStream::str() const {
return static_cast<std::ostringstream*>( m_oss )->str();
}
void ReusableStringStream::str( std::string const& str ) {
static_cast<std::ostringstream*>( m_oss )->str( str );
}
///////////////////////////////////////////////////////////////////////////
#ifndef CATCH_CONFIG_NOSTDOUT // If you #define this you must implement these functions
std::ostream& cout() { return std::cout; }
std::ostream& cerr() { return std::cerr; }
std::ostream& clog() { return std::clog; }
#endif
}
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