NBT_Print.hpp

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#pragma once
 
#include <format>
#include <stdio.h>


enum class NBT_Print_Level
{
    Info,       
    Warn,       
    Err,        
};
 

class NBT_Print
{
#if defined(_MSC_VER) && _MSC_VER < 1935 //旧版本MSVC 1935-不支持
#define format_string _Fmt_string //使用MSVC库内部类型
#endif
 
private:
    FILE *pfOutputInfo = NULL;
    FILE *pfOutputWarn = NULL;
    FILE *pfOutputErr = NULL;
 
public:
    using Level = NBT_Print_Level;  
 
public:

    NBT_Print(FILE *_pfOutputInfo = stdout, FILE *_pfOutputWarn = stderr, FILE *_pfOutputErr = stderr)
        : pfOutputInfo(_pfOutputInfo)
        , pfOutputWarn(_pfOutputWarn)
        , pfOutputErr(_pfOutputErr)
    {}
    
    ~NBT_Print(void) = default;

    template<typename... Args>
    void operator()(Level lvl, const std::format_string<Args...> fmt, Args&&... args) noexcept
    {
        FILE *pfOutput = NULL;
        switch (lvl)
        {
        case Level::Info:
            pfOutput = pfOutputInfo;
            break;
        case Level::Warn:
            pfOutput = pfOutputWarn;
            break;
        case Level::Err:
            pfOutput = pfOutputErr;
            break;
        default:
            //错误的等级不进行赋值，保持pfOutput为NULL，在后续跳过输出
            break;
        }
 
        if (pfOutput == NULL)//为NULL跳过
        {
            return;
        }
 
        try
        {
            auto tmp = std::format(std::move(fmt), std::forward<Args>(args)...);
            fwrite(tmp.data(), sizeof(tmp.data()[0]), tmp.size(), pfOutput);
        }
        catch (const std::exception &e)
        {
            fprintf(stderr, "ErrInfo Exception: \"%s\"\n", e.what());
        }
        catch (...)
        {
            fprintf(stderr, "ErrInfo Exception: \"Unknown Error\"\n");
        }
    }

    template<typename... Args>
    void operator()(const std::format_string<Args...> fmt, Args&&... args) noexcept
    {
        return operator()(Level::Info, std::move(fmt), std::forward<Args>(args)...);
    }
};

class NBT_NoPrint
{
public:
    using Level = NBT_Print_Level;  
 
public:
    NBT_NoPrint(void) noexcept
    {}

    ~NBT_NoPrint(void) noexcept
    {}

    template<typename... Args>
    void operator()(Level lvl, const std::format_string<Args...> fmt, Args&&... args) const noexcept
    {
        return;
    }

    template<typename... Args>
    void operator()(const std::format_string<Args...> fmt, Args&&... args) const noexcept
    {
        return;
    }
};