char.h

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/*
 * Copyright (C) 2024  Yeong-won Seo
 *
 * This file is part of LILAC.
 *
 * LILAC is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3, or (at your option) any later
 * version.
 *
 * LILAC is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <ostream>
#include <array>
 
namespace lilac::shared
{
    constexpr int MaxIntrinIndent = 255;
 
    template<typename T, T e, size_t N>
    struct __FilledString
    {
        constexpr __FilledString() noexcept
        {
            for (size_t i = 0; i < N; ++i)
                V[i] = e;
            V[N] = 0;
        }
 
        T V[N + 1];
    };
 
    template<int... Ts>
    struct __IndentationVector
    {
        template<int N>
        struct __Indentation
        {
            static constexpr auto V = __FilledString<char, '\t', N>();
            static constexpr const char* P = V.V;
        };
 
        static constexpr std::array<const char*, sizeof...(Ts)> Vs = { __Indentation<Ts>::P... };
    };
 
    template<int... Ts>
    constexpr const char* __GetIndentation(int c, std::integer_sequence<int, Ts...>)
    {
        return __IndentationVector<Ts...>::Vs[c];
    }
 
    constexpr const char* GetIndent(int c = 1)
    {
        return __GetIndentation(c, std::make_integer_sequence<int, MaxIntrinIndent>{});
    }
 
    inline std::ostream& endl(std::ostream& __os)
    {
        return __os.put('\n');
    }
}