C++ QDomAttr::prefix方法代码示例

void cleanDomElement(QDomElement &pDomElement,
                     QMap<QString, QString> &pElementsAttributes)
{
    // Serialise all the element's attributes and sort their serialised version
    // before removing them from the element and adding a new attribute that
    // will later on be used for string replacement

    static qulonglong attributeNumber = 0;
    static const int ULLONG_WIDTH = ceil(log(ULLONG_MAX));

    if (pDomElement.hasAttributes()) {
        QStringList serialisedAttributes = QStringList();
        QDomNamedNodeMap domElementAttributes = pDomElement.attributes();
        QDomAttr attributeNode;

        while (domElementAttributes.count()) {
            // Serialise (ourselves) the element's attribute
            // Note: to rely on QDomNode::save() to do the serialisation isn't
            //       good enough. Indeed, if it is going to be fine for an
            //       attribute that doesn't have a prefix, e.g.
            //           name="my_name"
            //       it may not be fine for an attribute with a prefix, e.g.
            //           cmeta:id="my_cmeta_id"
            //       since depending on how that attribute has been created
            //       (i.e. using QDomDocument::createAttribute() or
            //       QDomDocument::createAttributeNS()), then it may or not have
            //       a namespace associated with it. If it does, then its
            //       serialisation will look something like
            //           cmeta:id="my_cmeta_id" xmlns:cmeta="http://www.cellml.org/metadata/1.0#"
            //       which is clearly not what we want since that's effectively
            //       two attributes in one. So, we need to separate them, which
            //       is what we do here, after making sure that the namespace
            //       for the attribute is not already defined for the given DOM
            //       element...

            attributeNode = domElementAttributes.item(0).toAttr();

            if (attributeNode.namespaceURI().isEmpty()) {
                serialisedAttributes << attributeNode.name()+"=\""+attributeNode.value()+"\"";
            } else {
                serialisedAttributes << attributeNode.prefix()+":"+attributeNode.name()+"=\""+attributeNode.value()+"\"";

                if (   attributeNode.prefix().compare(pDomElement.prefix())
                    && attributeNode.namespaceURI().compare(pDomElement.namespaceURI())) {
                    serialisedAttributes << "xmlns:"+attributeNode.prefix()+"=\""+attributeNode.namespaceURI()+"\"";
                }
            }

            // Remove the attribute node from the element

            pDomElement.removeAttributeNode(attributeNode);
        }

        // Sort the serialised attributes, using the attributes' name, and
        // remove duplicates, if any

        std::sort(serialisedAttributes.begin(), serialisedAttributes.end(), sortSerialisedAttributes);

        serialisedAttributes.removeDuplicates();

        // Keep track of the serialisation of the element's attribute

        QString elementAttributes = QString("Element%1Attributes").arg(++attributeNumber, ULLONG_WIDTH, 10, QChar('0'));

        pElementsAttributes.insert(elementAttributes, serialisedAttributes.join(" "));

        // Add a new attribute to the element
        // Note: this attribute, once serialised by QDomDocument::save(), will
        //       be used to do a string replacement (see
        //       qDomDocumentToString())...

        domElementAttributes.setNamedItem(pDomElement.ownerDocument().createAttribute(elementAttributes));
    }

    // Recursively clean ourselves

    for (QDomElement childElement = pDomElement.firstChildElement();
         !childElement.isNull(); childElement = childElement.nextSiblingElement()) {
        cleanDomElement(childElement, pElementsAttributes);
    }
}