mgl_text_format_argument.h

[詳解]

// SPDX-License-Identifier: Zlib
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
 
#ifndef INCGUARD_MGL_TEXT_FORMAT_ARGUMENT_H_1622208320
#define INCGUARD_MGL_TEXT_FORMAT_ARGUMENT_H_1622208320
 
#include <type_traits>
#include <utility>
 
#include <mgl/file/mgl_file_path_view.h>
#include <mgl/stl/mgl_stl_containers.h>
#include <mgl/stl/mgl_stl_string.h>
#include <mgl/text/mgl_text_defs.h>
#include <mgl/text/mgl_text_format_options.h>
 
namespace MGL::Text
{
class FormatArgument
{
public:
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    FormatArgument() noexcept
        : _type(Type::Void)
        , _i(0)
    {}
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    template <typename T>
    FormatArgument(const T &value) noexcept
        : _type(Type::Void)
        , _i(0)
    {
        // 整数
        if constexpr (std::is_integral_v<T>)
        {
            // 符号付き
            if constexpr (std::is_signed_v<T>)
            {
                _type = Type::Int;
                _i = value;
            }
            // 符号なし
            else
            {
                _type = Type::UnsignedInt;
                _ui = value;
            }
        }
        // 浮動小数点数
        else if constexpr (std::is_floating_point_v<T>)
        {
            _type = Type::Float;
            _f = value;
        }
        // bool型
        else if constexpr (std::is_same_v<T, bool>)
        {
            _type = Type::Bool;
            _b = value;
        }
        // MGL::STL::string型
        else if constexpr (std::is_same_v<T, STL::string>)
        {
            _type = Type::String;
            _i = 0;
            _string = value;
        }
        // その他 const char *型に変換可能な型
        else if constexpr (std::is_convertible_v<T, const char *>)
        {
            _type = Type::String;
            _i = 0;
            _string = value;
        }
        // 上記以外のポインタ型
        else if constexpr (std::is_pointer_v<T>)
        {
            _type = Type::Pointer;
            _ui = reinterpret_cast<uint64_t>(value);
        }
        // それ以外は不明
        else
        {
            static_assert(true, "Unknown format type detected. Please cast int, float, or const char * type.");
        }
    }
 
    [[nodiscard]] STL::string ToString(const FormatOptions &options = FormatOptions()) const noexcept;
 
    static const char *Parse(FormatOptions &options, const char *parseText) noexcept;
 
    static STL::vector<IndexedCharacter> ToIndexedCharacters(const FormatOptions &options) noexcept;
 
private:
    enum class Type : uint8_t
    {
        Void,           
        Int,            
        UnsignedInt,    
        Float,          
        Bool,           
        String,         
        Pointer,        
    };
 
    [[nodiscard]] bool IsZero() const noexcept;
    [[nodiscard]] bool IsPositiveValue() const noexcept;
    [[nodiscard]] bool IsNegativeValue() const noexcept;
    [[nodiscard]] STL::string ToStringFromNumber(const FormatOptions &options) const noexcept;
    [[nodiscard]] STL::string ToStringFromDecimal(const FormatOptions &options) const noexcept;
    [[nodiscard]] STL::string ToHexStringFromValue(const FormatOptions &options) const noexcept;
 
    static void AlignmentString(STL::string &result, const FormatOptions &options, const STL::string &string) noexcept;
 
    Type _type;
    union
    {
        int64_t _i;
        uint64_t _ui;
        float _f;
        bool _b;
    };
 
    STL::string _string;
};
 
using FormatArgs = STL::vector<FormatArgument>;
 
}    // namespace MGL::Text
 
#endif    // INCGUARD_MGL_TEXT_FORMAT_ARGUMENT_H_1622208320
 
// vim: et ts=4 sw=4 sts=4