Method save

src/backend/matrix/Matrix.cpp:1115–1213

############################################################################## ################## Serialization/Deserialization ########################### ##############################################################################

// ##################  Serialization/Deserialization  ###########################
// ##############################################################################
void Matrix::save(QXmlStreamWriter* writer) const {
	Q_D(const Matrix);
	DEBUG(Q_FUNC_INFO);
	writer->writeStartElement(QStringLiteral("matrix"));
	writeBasicAttributes(writer);
	writeCommentElement(writer);

	// formula
	writer->writeStartElement(QStringLiteral("formula"));
	writer->writeCharacters(d->formula);
	writer->writeEndElement();

	// format
	writer->writeStartElement(QStringLiteral("format"));
	writer->writeAttribute(QStringLiteral("mode"), QString::number(static_cast<int>(d->mode)));
	writer->writeAttribute(QStringLiteral("headerFormat"), QString::number(static_cast<int>(d->headerFormat)));
	writer->writeAttribute(QStringLiteral("numericFormat"), QChar::fromLatin1(d->numericFormat));
	writer->writeAttribute(QStringLiteral("precision"), QString::number(d->precision));
	writer->writeEndElement();

	// dimensions
	writer->writeStartElement(QStringLiteral("dimension"));
	writer->writeAttribute(QStringLiteral("x_start"), QString::number(d->xStart));
	writer->writeAttribute(QStringLiteral("x_end"), QString::number(d->xEnd));
	writer->writeAttribute(QStringLiteral("y_start"), QString::number(d->yStart));
	writer->writeAttribute(QStringLiteral("y_end"), QString::number(d->yEnd));
	writer->writeEndElement();

	// vector with row heights
	writer->writeStartElement(QStringLiteral("row_heights"));
	const char* data = reinterpret_cast<const char*>(d->rowHeights.constData());
	int size = d->rowHeights.size() * sizeof(int);
	writer->writeCharacters(QLatin1String(QByteArray::fromRawData(data, size).toBase64()));
	writer->writeEndElement();

	// vector with column widths
	writer->writeStartElement(QStringLiteral("column_widths"));
	data = reinterpret_cast<const char*>(d->columnWidths.constData());
	size = d->columnWidths.size() * sizeof(int);
	writer->writeCharacters(QLatin1String(QByteArray::fromRawData(data, size).toBase64()));
	writer->writeEndElement();

	const auto columnCount = this->columnCount();

	// columns
	DEBUG("	mode = " << static_cast<int>(d->mode))
	switch (d->mode) {
	case AbstractColumn::ColumnMode::Double:
		size = d->rowCount() * sizeof(double);
		for (int i = 0; i < columnCount; ++i) {
			data = reinterpret_cast<const char*>(static_cast<QVector<QVector<double>>*>(d->data)->at(i).constData());
			writer->writeStartElement(QStringLiteral("column"));
			writer->writeCharacters(QLatin1String(QByteArray::fromRawData(data, size).toBase64()));
			writer->writeEndElement();
		}
		break;
	case AbstractColumn::ColumnMode::Text:
		size = d->rowCount() * sizeof(QString);