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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#ifndef QANYSTRINGVIEWUTILS_P_H
#define QANYSTRINGVIEWUTILS_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 <QtCore/private/qjson_p.h>
#include <QtCore/qanystringview.h>
#include <QtCore/qcbormap.h>
#include <QtCore/qcborvalue.h>
QT_BEGIN_NAMESPACE
namespace QAnyStringViewUtils {
inline QAnyStringView toStringView(const QCborValue &value)
{
const QCborContainerPrivate *container = QJsonPrivate::Value::container(value);
if (!container)
return QAnyStringView();
const qint64 n = QJsonPrivate::Value::valueHelper(value);
const auto &e = container->elements.at(n);
const auto data = container->byteData(e);
if (!data)
return QAnyStringView();
if (e.flags & QtCbor::Element::StringIsUtf16)
return data->asStringView();
if (e.flags & QtCbor::Element::StringIsAscii)
return data->asLatin1();
return data->asUtf8StringView();
}
inline QAnyStringView toStringView(const QCborMap &map, QLatin1StringView key)
{
return toStringView(map[key]);
}
// Note: This only works if part is US-ASCII, but there is no type to encode this information!
inline bool endsWith(QAnyStringView whole, QLatin1StringView part)
{
Q_ASSERT(QtPrivate::isAscii(part));
return whole.length() >= part.length() && whole.last(part.length()) == part;
}
// Note: This only works if part is US-ASCII, but there is no type to encode this information!
inline bool startsWith(QAnyStringView whole, QLatin1StringView part)
{
Q_ASSERT(QtPrivate::isAscii(part));
return whole.length() >= part.length() && whole.first(part.length()) == part;
}
inline bool doesContain(QStringView whole, QLatin1Char part) { return whole.contains(part); }
inline bool doesContain(QLatin1StringView whole, QLatin1Char part) { return whole.contains(part); }
inline bool doesContain(QUtf8StringView whole, QLatin1Char part)
{
return QByteArrayView(whole.data(), whole.size()).contains(part.toLatin1());
}
inline bool contains(QAnyStringView whole, QLatin1Char part)
{
return whole.visit([&](auto view) { return doesContain(view, part); });
}
inline qsizetype getLastIndexOf(QStringView whole, QLatin1StringView part)
{
return whole.lastIndexOf(part);
}
inline qsizetype getLastIndexOf(QLatin1StringView whole, QLatin1StringView part)
{
return whole.lastIndexOf(part);
}
inline qsizetype getLastIndexOf(QUtf8StringView whole, QLatin1StringView part)
{
return QByteArrayView(whole.data(), whole.size()).lastIndexOf(part);
}
inline qsizetype lastIndexOf(QAnyStringView whole, QLatin1StringView part)
{
Q_ASSERT(QtPrivate::isAscii(part));
return whole.visit([&](auto view) { return getLastIndexOf(view, part); });
}
inline int toInt(QUtf8StringView view)
{
return QByteArrayView(view.data(), view.length()).toInt();
}
inline int toInt(QLatin1StringView view) { return view.toInt(); }
inline int toInt(QStringView view) { return view.toInt(); }
inline int toInt(QAnyStringView string)
{
return string.visit([](auto view) { return toInt(view); });
}
template<typename StringView>
QAnyStringView doTrimmed(StringView string)
{
if constexpr (std::is_same_v<StringView, QStringView>)
return string.trimmed();
if constexpr (std::is_same_v<StringView, QLatin1StringView>)
return string.trimmed();
if constexpr (std::is_same_v<StringView, QUtf8StringView>)
return QByteArrayView(string.data(), string.length()).trimmed();
}
inline QAnyStringView trimmed(QAnyStringView string)
{
return string.visit([](auto data) {
return doTrimmed(data);
});
}
template<typename StringView, typename Handler>
auto processAsUtf8(StringView string, Handler &&handler)
{
if constexpr (std::is_same_v<StringView, QStringView>)
return handler(QByteArrayView(string.toUtf8()));
if constexpr (std::is_same_v<StringView, QLatin1StringView>)
return handler(QByteArrayView(string.data(), string.length()));
if constexpr (std::is_same_v<StringView, QUtf8StringView>)
return handler(QByteArrayView(string.data(), string.length()));
if constexpr (std::is_same_v<StringView, QByteArrayView>)
return handler(string);
if constexpr (std::is_same_v<StringView, QByteArray>)
return handler(QByteArrayView(string));
if constexpr (std::is_same_v<StringView, QAnyStringView>) {
// Handler is:
// * a reference if an lvalue ref is passed
// * a value otherwise
// We conserve its nature for passing to the lambda below.
// This is necessary because we need to decide on the nature of
// the lambda capture as part of the syntax (prefix '&' or not).
// So we always pass a reference-conserving wrapper as value.
struct Wrapper { Handler handler; };
return string.visit([w = Wrapper { std::forward<Handler>(handler) }](auto view) mutable {
static_assert(!(std::is_same_v<decltype(view), QAnyStringView>));
return processAsUtf8(std::move(view), std::forward<Handler>(w.handler));
});
}
Q_UNREACHABLE();
}
// Note: This only works if sep is US-ASCII, but there is no type to encode this information!
inline QList<QAnyStringView> split(QAnyStringView source, QLatin1StringView sep)
{
Q_ASSERT(QtPrivate::isAscii(sep));
QList<QAnyStringView> list;
if (source.isEmpty()) {
list.append(source);
return list;
}
qsizetype start = 0;
qsizetype end = source.length();
for (qsizetype current = 0; current < end; ++current) {
if (source.mid(current, sep.length()) == sep) {
list.append(source.mid(start, current - start));
start = current + sep.length();
}
}
if (start < end)
list.append(source.mid(start, end - start));
return list;
}
}
QT_END_NAMESPACE
#endif // QANYSTRINGVIEWUTILS_P_H
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