Yaml.h

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/** @noop License Comment
 *  @file
 *  @copyright
 *  This Source Code is subject to the terms of the Mozilla Public License, v2.0.
 *  If a copy of the MPL was not distributed with this file You can obtain one at
 *  https://mozilla.org/MPL/2.0/
 *  
 *  @author David Mórász
 *  @date 2025
 */
 
#pragma once
 
#include "CoreMinimal.h"
#include "Mcro/Text.h"
 
#include "Mcro/LibraryIncludes/Start.h"
#include "PreMagicEnum.h"
#include "magic_enum.hpp"
#include "yaml-cpp/yaml.h"
#include "Mcro/LibraryIncludes/End.h"
 
namespace Mcro::Yaml
{
    using namespace Mcro::Text;
 
    /**
     * RAII friendly region annotation for YAML::Emitter streams
     * @tparam Begin The YAML region begin tag
     * @tparam End The YAML region end tag
     */
    template <YAML::EMITTER_MANIP Begin, YAML::EMITTER_MANIP End>
    class TScopedRegion
    {
        YAML::Emitter& Out;
 
    public:
        TScopedRegion(YAML::Emitter& out) : Out(out) { Out << Begin; }
        ~TScopedRegion() { Out << End; }
 
        template <typename T>
        TScopedRegion& operator << (T&& rhs)
        {
            Out << Forward<T>(rhs);
            return *this;
        }
    };
 
    /** Annotate a mapping region in a YAML::Emitter stream, which ends when this object goes out of scope */
    using FMap = TScopedRegion<YAML::BeginMap, YAML::EndMap>;
    
    /** Annotate a sequence region in a YAML::Emitter stream, which ends when this object goes out of scope */
    using FSeq = TScopedRegion<YAML::BeginSeq, YAML::EndSeq>;
 
    /** Convenience operator to append Unreal or potentially wide strings to YAML::Emitter streams */
    template <typename String>
    requires (CStringOrViewOrName<String> || CStdStringOrView<String>)
    YAML::Emitter& operator << (YAML::Emitter& out, String&& v)
    {
        out << StdConvertUtf8(Forward<String>(v));
        return out;
    }
    
    /** Convenience operator to append enums as strings to a YAML::Emitter streams */
    template <CEnum Enum>
    YAML::Emitter& operator << (YAML::Emitter& out, Enum v)
    {
        out << StdConvertUtf8(magic_enum::enum_name(v));
        return out;
    }
}