Magic_Game/src/kiwano/core/Logger.h

// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#pragma once
#include <iomanip>
#include <sstream>
#include <kiwano/macros.h>
#include <kiwano/core/common.h>

#ifndef KGE_SYS_LOG
#	ifdef KGE_DEBUG
#		define KGE_SYS_LOG(FORMAT, ...)	::kiwano::Logger::instance().Printf(::kiwano::Logger::Level::System, FORMAT, __VA_ARGS__)
#	else
#		define KGE_SYS_LOG __noop
#	endif
#endif

#ifndef KGE_WARN
#	define KGE_WARN(FORMAT, ...)		::kiwano::Logger::instance().Printf(::kiwano::Logger::Level::Warning, FORMAT, __VA_ARGS__)
#endif

#ifndef KGE_ERROR
#	define KGE_ERROR(FORMAT, ...)		::kiwano::Logger::instance().Printf(::kiwano::Logger::Level::Error, FORMAT, __VA_ARGS__)
#endif

#ifndef KGE_LOG
#	define KGE_LOG(...)					::kiwano::Logger::instance().Println(::kiwano::Logger::Level::Info, __VA_ARGS__)
#endif

#ifndef KGE_LOGF
#	define KGE_LOGF(FORMAT, ...)		::kiwano::Logger::instance().Printf(::kiwano::Logger::Level::Info, FORMAT, __VA_ARGS__)
#endif

namespace kiwano
{
	/**
	* \~chinese
	* @brief <EFBFBD><EFBFBD>־
	*/
	class KGE_API Logger
		: public Singleton<Logger>
	{
		friend Singleton<Logger>;

	public:
		/// \~chinese
		/// @brief <20><>־<EFBFBD><D6BE><EFBFBD><EFBFBD>
		enum class Level
		{
			Info,		///< <20><>Ϣ
			System,		///< ϵͳ
			Warning,	///< <20><><EFBFBD><EFBFBD>
			Error		///< <20><><EFBFBD><EFBFBD>
		};

		/// \~chinese
		/// @brief <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		using OutputStream = std::wostream;

		/// \~chinese
		/// @brief <20><><EFBFBD><EFBFBD>̨<EFBFBD><CCA8>ɫ
		using ConsoleColor = Function<OutputStream& (OutputStream&)>;

		/// \~chinese
		/// @brief <20><>ʾ<EFBFBD><CABE><EFBFBD>رտ<D8B1><D5BF><EFBFBD>̨
		void ShowConsole(bool show);

		/// \~chinese
		/// @brief <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־
		void Enable();

		/// \~chinese
		/// @brief <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־
		void Disable();

		/// \~chinese
		/// @brief <20><>ӡ<EFBFBD><D3A1>־
		/// @param level <20><>־<EFBFBD><D6BE><EFBFBD><EFBFBD>
		/// @param format <20><>ʽ<EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>
		void Printf(Level level, const wchar_t* format, ...);

		/// \~chinese
		/// @brief <20><>ӡ<EFBFBD><D3A1>־
		/// @param level <20><>־<EFBFBD><D6BE><EFBFBD><EFBFBD>
		/// @param args <20><><EFBFBD><EFBFBD>
		template <typename ..._Args>
		void Print(Level level, _Args&& ... args);

		/// \~chinese
		/// @brief <20><>ӡһ<D3A1><D2BB><EFBFBD><EFBFBD>־
		/// @param level <20><>־<EFBFBD><D6BE><EFBFBD><EFBFBD>
		/// @param args <20><><EFBFBD><EFBFBD>
		template <typename ..._Args>
		void Println(Level level, _Args&& ... args);

		/// \~chinese
		/// @brief <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		std::wostream& GetOutputStream();

		/// \~chinese
		/// @brief <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		std::wostream& GetErrorStream();

		/// \~chinese
		/// @brief <20>ض<EFBFBD><D8B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		std::wstreambuf* RedirectOutputStreamBuffer(std::wstreambuf* buf);

		/// \~chinese
		/// @brief <20>ض<EFBFBD><D8B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		std::wstreambuf* RedirectErrorStreamBuffer(std::wstreambuf* buf);

		/// \~chinese
		/// @brief <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void ResetOutputStream();

	private:
		Logger();

		~Logger();

		void Prepare(Level level, StringStream& sstream);

		void Output(Level level, StringStream& sstream);

		void ResetConsoleColor() const;

		OutputStream& DefaultOutputColor(OutputStream& out);

	private:
		bool enabled_;
		WORD default_stdout_color_;
		WORD default_stderr_color_;

		OutputStream output_stream_;
		OutputStream error_stream_;
	};


	inline void Logger::Enable()
	{
		enabled_ = true;
	}

	inline void Logger::Disable()
	{
		enabled_ = false;
	}

	template <typename ..._Args>
	void Logger::Print(Level level, _Args&& ... args)
	{
		if (!enabled_)
			return;

		StringStream sstream;
		Prepare(level, sstream);

		// Format message
		(void)std::initializer_list<int>{((sstream << ' ' << args), 0)...};

		Output(level, sstream);
	}

	template <typename ..._Args>
	void Logger::Println(Level level, _Args&& ... args)
	{
		if (!enabled_)
			return;

		StringStream sstream;
		Prepare(level, sstream);

		// Format message
		(void)std::initializer_list<int>{((sstream << ' ' << args), 0)...};

		sstream << L"\r\n";

		Output(level, sstream);
	}

	inline void Logger::ResetConsoleColor() const
	{
		::SetConsoleTextAttribute(::GetStdHandle(STD_OUTPUT_HANDLE), default_stdout_color_);
		::SetConsoleTextAttribute(::GetStdHandle(STD_ERROR_HANDLE), default_stderr_color_);
	}

	inline Logger::OutputStream& Logger::DefaultOutputColor(OutputStream& out)
	{
		::SetConsoleTextAttribute(::GetStdHandle(STD_OUTPUT_HANDLE), default_stdout_color_);
		return out;
	}

	inline std::wostream& Logger::GetOutputStream()
	{
		return output_stream_;
	}

	inline std::wostream& Logger::GetErrorStream()
	{
		return error_stream_;
	}
}