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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQMLSTRINGCONVERTERS_P_H
#define QQMLSTRINGCONVERTERS_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/qglobal.h>
#include <QtCore/qvariant.h>
#include <private/qtqmlglobal_p.h>
QT_BEGIN_NAMESPACE
class QPointF;
class QSizeF;
class QRectF;
class QString;
class QByteArray;
namespace QQmlStringConverters
{
Q_QML_EXPORT QVariant variantFromString(const QString &, QMetaType preferredType, bool *ok = nullptr);
Q_QML_EXPORT QVariant colorFromString(const QString &, bool *ok = nullptr);
Q_QML_EXPORT unsigned rgbaFromString(const QString &, bool *ok = nullptr);
#if QT_CONFIG(datestring)
Q_QML_EXPORT QDate dateFromString(const QString &, bool *ok = nullptr);
Q_QML_EXPORT QTime timeFromString(const QString &, bool *ok = nullptr);
Q_QML_EXPORT QDateTime dateTimeFromString(const QString &, bool *ok = nullptr);
#endif
Q_QML_EXPORT QPointF pointFFromString(const QString &, bool *ok = nullptr);
Q_QML_EXPORT QSizeF sizeFFromString(const QString &, bool *ok = nullptr);
Q_QML_EXPORT QRectF rectFFromString(const QString &, bool *ok = nullptr);
// checks if the string contains a list of doubles separated by separators, like "double1
// separators1 double2 separators2 ..." for example.
template<int NumParams, char16_t... separators>
bool isValidNumberString(const QString &s, std::array<double, NumParams> *numbers = nullptr)
{
Q_STATIC_ASSERT_X(
NumParams == 2 || NumParams == 3 || NumParams == 4 || NumParams == 16,
"Unsupported number of params; add an additional case below if necessary.");
constexpr std::array<char16_t, NumParams - 1> separatorArray{ separators... };
// complain about missing separators when first or last entry is initialized with 0
Q_STATIC_ASSERT_X(separatorArray[0] != 0,
"Did not specify any separators for isValidNumberString.");
Q_STATIC_ASSERT_X(separatorArray[NumParams - 2] != 0,
"Did not specify enough separators for isValidNumberString.");
bool floatOk = true;
QStringView view(s);
for (qsizetype i = 0; i < NumParams - 1; ++i) {
const qsizetype commaIndex = view.indexOf(separatorArray[i]);
if (commaIndex == -1)
return false;
const auto current = view.first(commaIndex).toDouble(&floatOk);
if (!floatOk)
return false;
if (numbers)
(*numbers)[i] = current;
view = view.sliced(commaIndex + 1);
}
const auto current = view.toDouble(&floatOk);
if (!floatOk)
return false;
if (numbers)
(*numbers)[NumParams - 1] = current;
return true;
}
// Constructs a value type T from the given string that contains NumParams double values
// separated by separators, like "double1 separators1 double2 separators2 ..." for example.
template<typename T, int NumParams, char16_t... separators>
T valueTypeFromNumberString(const QString &s, bool *ok = nullptr)
{
Q_STATIC_ASSERT_X(
NumParams == 2 || NumParams == 3 || NumParams == 4 || NumParams == 16,
"Unsupported number of params; add an additional case below if necessary.");
std::array<double, NumParams> parameters;
if (!isValidNumberString<NumParams, separators...>(s, ¶meters)) {
if (ok)
*ok = false;
return T{};
}
if (ok)
*ok = true;
if constexpr (NumParams == 2) {
return T(parameters[0], parameters[1]);
} else if constexpr (NumParams == 3) {
return T(parameters[0], parameters[1], parameters[2]);
} else if constexpr (NumParams == 4) {
return T(parameters[0], parameters[1], parameters[2], parameters[3]);
} else if constexpr (NumParams == 16) {
return T(parameters[0], parameters[1], parameters[2], parameters[3], parameters[4],
parameters[5], parameters[6], parameters[7], parameters[8], parameters[9],
parameters[10], parameters[11], parameters[12], parameters[13], parameters[14],
parameters[15]);
}
Q_UNREACHABLE_RETURN(T{});
}
}
QT_END_NAMESPACE
#endif // QQMLSTRINGCONVERTERS_P_H
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