/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#pragma once

#include "smallstringiterator.h"
#include "smallstringlayout.h"
#include "smallstringview.h"

#pragma push_macro("constexpr")
#ifndef __cpp_constexpr
#define constexpr
#endif

#pragma push_macro("noexcept")
#ifndef __cpp_noexcept
#define noexcept
#endif

namespace Utils {

class SmallString;

class SmallStringLiteral
{
    friend class SmallString;

public:
    using const_iterator = Internal::SmallStringIterator<std::random_access_iterator_tag, const char>;
    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
    using size_type = std::size_t;

    template<size_type Size>
    constexpr
    SmallStringLiteral(const char(&string)[Size]) noexcept
        : m_data(string)
    {
        static_assert(Size >= 1, "Invalid string literal! Length is zero!");
    }

    constexpr
    SmallStringLiteral(const char *string, const size_type size) noexcept
        : m_data(string, size)
    {
    }

    constexpr
    const char *data() const
    {
        return Q_LIKELY(isShortString()) ? m_data.shortString.string : m_data.allocated.data.pointer;
    }

    constexpr
    size_type size() const
    {
        return Q_LIKELY(isShortString()) ? m_data.shortString.shortStringSize : m_data.allocated.data.size;
    }

    const_iterator begin() const noexcept
    {
        return data();
    }

    const_iterator end() const noexcept
    {
        return data() + size();
    }

    const_reverse_iterator rbegin() const noexcept
    {
        return const_reverse_iterator(end() - 1l);
    }

    const_reverse_iterator rend() const noexcept
    {
        return const_reverse_iterator(begin() - 1l);
    }

    constexpr static
    size_type shortStringCapacity() noexcept
    {
        return sizeof(Internal::ShortStringLayout) - 2;
    }

    constexpr
    bool isShortString() const noexcept
    {
        return !m_data.shortString.isReference;
    }

    constexpr
    bool isReadOnlyReference() const noexcept
    {
        return m_data.shortString.isReadOnlyReference;
    }

    operator SmallStringView() const
    {
        return SmallStringView(data(), size());
    }

private:
    constexpr SmallStringLiteral(Internal::StringDataLayout data) noexcept
        : m_data(data)
    {
    }
private:
    Internal::StringDataLayout m_data;
};

}  // namespace Utils

#pragma pop_macro("noexcept")
#pragma pop_macro("constexpr")