diff options
Diffstat (limited to 'src/qml/qml/qqmlstringconverters_p.h')
| -rw-r--r-- | src/qml/qml/qqmlstringconverters_p.h | 91 |
1 files changed, 82 insertions, 9 deletions
diff --git a/src/qml/qml/qqmlstringconverters_p.h b/src/qml/qml/qqmlstringconverters_p.h index 5a07b947ca..0d220b11fc 100644 --- a/src/qml/qml/qqmlstringconverters_p.h +++ b/src/qml/qml/qqmlstringconverters_p.h @@ -30,19 +30,92 @@ class QByteArray; namespace QQmlStringConverters { - Q_QML_PRIVATE_EXPORT QVariant variantFromString(const QString &, QMetaType preferredType, bool *ok = nullptr); + Q_QML_EXPORT QVariant variantFromString(const QString &, QMetaType preferredType, bool *ok = nullptr); - Q_QML_PRIVATE_EXPORT QVariant colorFromString(const QString &, bool *ok = nullptr); - Q_QML_PRIVATE_EXPORT unsigned rgbaFromString(const QString &, 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_PRIVATE_EXPORT QDate dateFromString(const QString &, bool *ok = nullptr); - Q_QML_PRIVATE_EXPORT QTime timeFromString(const QString &, bool *ok = nullptr); - Q_QML_PRIVATE_EXPORT QDateTime dateTimeFromString(const QString &, bool *ok = nullptr); + 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_PRIVATE_EXPORT QPointF pointFFromString(const QString &, bool *ok = nullptr); - Q_QML_PRIVATE_EXPORT QSizeF sizeFFromString(const QString &, bool *ok = nullptr); - Q_QML_PRIVATE_EXPORT QRectF rectFFromString(const QString &, bool *ok = nullptr); + 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 |