Variant.h

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/* ========================================
 
  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
 
======================================== */
 
#pragma once
 
#include <NeKit/Config.h>
#include <NeKit/Json.h>
#include <NeKit/KString.h>
#include <NeKit/TOML.h>
#include <SwapKit/DiskSwap.h>
 
namespace Kernel {
class Variant final {
 public:
  enum class VariantKind {
    kInvalid = 0,
    kString  = 200,
    kBlob,
    kNull,
    kJson,
    kTOML,
    kSwap,
  };
 
 public:
  explicit Variant() = delete;
 
 public:
  NE_COPY_DEFAULT(Variant)
 
  ~Variant() = default;
 
 public:
  template <typename CharKind>
  explicit Variant(KBasicString<CharKind>* stringView)
      : fPtr((VoidPtr) stringView), fKind(VariantKind::kString) {}
 
  explicit Variant(JsonObject<>* json) : fPtr((VoidPtr) json), fKind(VariantKind::kJson) {}
 
  explicit Variant(TOMLObject* toml) : fPtr((VoidPtr) toml), fKind(VariantKind::kTOML) {}
 
  explicit Variant(nullPtr ptr) : fPtr(ptr), fKind(VariantKind::kNull) {}
 
  explicit Variant(SWAP_DISK_HEADER* ptr) : fPtr(ptr), fKind(VariantKind::kSwap) {}
 
  explicit Variant(VoidPtr ptr) : fPtr(ptr), fKind(VariantKind::kBlob) {}
 
 public:
  const Char* ToString();

  VoidPtr Leak();
 
  template <typename T>
  T* As() {
    return reinterpret_cast<T*>(fPtr);
  }
 
  VariantKind& Kind();
 
 private:
  VoidPtr     fPtr{nullptr};
  VariantKind fKind{VariantKind::kNull};
};
}  // namespace Kernel