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/****************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
******************************************************************************/
#ifndef QOFFSETSTRINGARRAY_P_H
#define QOFFSETSTRINGARRAY_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "private/qglobal_p.h"
#include <tuple>
#include <array>
#include <limits>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
template<int N, int O, int I, int ... Idx>
struct OffsetSequenceHelper : OffsetSequenceHelper<N - 1, O + I, Idx..., O> { };
template<int Last, int I, int S, int ... Idx>
struct OffsetSequenceHelper<1, Last, I, S, Idx...> : IndexesList<Last + I, Idx..., Last>
{
// the unary + before std::numeric_limits below is required. Otherwise we get on g++-10.2:
// error: comparison is always false due to limited range of data type [-Werror=type-limits]
static const constexpr auto Length = Last + I;
using Type = typename std::conditional<
Last <= +std::numeric_limits<quint8>::max(),
quint8,
typename std::conditional<
Last <= std::numeric_limits<quint16>::max(),
quint16,
int>::type
>::type;
};
template<int ... Idx>
struct OffsetSequence : OffsetSequenceHelper<sizeof ... (Idx), 0, Idx..., 0> { };
template<int N>
struct StaticString
{
const char data[N];
};
template<>
struct StaticString<0>
{
static constexpr int size() noexcept
{
return 0;
}
};
template<typename, typename>
struct StaticStringBuilder;
template<int ... I1, int ... I2>
struct StaticStringBuilder<IndexesList<I1...>, IndexesList<I2...>>
{
QT_WARNING_PUSH
QT_WARNING_DISABLE_MSVC(4100) // The formal parameter is not referenced in the body of the function.
// The unreferenced parameter is ignored.
// It happens when 'rs' is StaticString<0>
template<int N1, int N2>
static constexpr StaticString<N1 + N2> concatenate(
const char (&ls)[N1], const StaticString<N2> &rs) noexcept
{
return StaticString<N1 + N2>{{ls[I1]..., rs.data[I2]...}};
}
QT_WARNING_POP
};
template<int Sum>
constexpr StaticString<0> staticString() noexcept
{
return StaticString<0>{};
}
QT_WARNING_PUSH
QT_WARNING_DISABLE_MSVC(4503)
template<int Sum, int I, int ... Ix>
constexpr StaticString<Sum> staticString(const char (&s)[I], const char (&...sx)[Ix]) noexcept
{
return StaticStringBuilder<
makeIndexSequence<I>,
makeIndexSequence<Sum - I>>::concatenate(s, staticString<Sum - I>(sx...));
}
QT_WARNING_POP
} // namespace QtPrivate
QT_WARNING_PUSH
#if defined(Q_CC_GNU_ONLY) && __GNUC__ == 9
QT_WARNING_DISABLE_GCC("-Wstringop-overflow")
#endif
template<typename T, int SizeString, int SizeOffsets>
class QOffsetStringArray
{
public:
using Type = T;
template<int ... Ox>
constexpr QOffsetStringArray(const QtPrivate::StaticString<SizeString> &str,
QtPrivate::IndexesList<SizeString, Ox...>) noexcept
: m_string(str),
m_offsets{Ox...}
{ }
constexpr inline const char *operator[](const int index) const noexcept
{
return m_string.data + m_offsets[qBound(int(0), index, SizeOffsets - 1)];
}
constexpr inline const char *at(const int index) const noexcept
{
return m_string.data + m_offsets[index];
}
constexpr inline const char *str() const { return m_string.data; }
constexpr inline const T *offsets() const { return m_offsets; }
constexpr inline int count() const { return SizeOffsets; }
static constexpr const auto sizeString = SizeString;
static constexpr const auto sizeOffsets = SizeOffsets;
private:
QtPrivate::StaticString<SizeString> m_string;
const T m_offsets[SizeOffsets];
};
QT_WARNING_POP
template<typename T, int N, int ... Ox>
constexpr QOffsetStringArray<T, N, sizeof ... (Ox)> qOffsetStringArray(
const QtPrivate::StaticString<N> &string,
QtPrivate::IndexesList<N, Ox...> offsets) noexcept
{
return QOffsetStringArray<T, N, sizeof ... (Ox)>(
string,
offsets);
}
template<int ... Nx>
struct QOffsetStringArrayRet
{
using Offsets = QtPrivate::OffsetSequence<Nx...>;
using Type = QOffsetStringArray<typename Offsets::Type, Offsets::Length, sizeof ... (Nx)>;
};
template<int ... Nx>
constexpr auto qOffsetStringArray(const char (&...strings)[Nx]) noexcept -> typename QOffsetStringArrayRet<Nx...>::Type
{
using Offsets = QtPrivate::OffsetSequence<Nx...>;
return qOffsetStringArray<typename Offsets::Type>(
QtPrivate::staticString<Offsets::Length>(strings...), Offsets{});
}
QT_END_NAMESPACE
#endif // QOFFSETSTRINGARRAY_P_H
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