C++ QXmlNodeModelIndex::iterate方法代码示例

QUrl AccelTree::baseUri(const QXmlNodeModelIndex &ni) const
{
    switch(kind(toPreNumber(ni)))
    {
        case QXmlNodeModelIndex::Document:
            return baseUri();
        case QXmlNodeModelIndex::Element:
        {
            const QXmlNodeModelIndex::Iterator::Ptr it(iterate(ni, QXmlNodeModelIndex::AxisAttribute));
            QXmlNodeModelIndex next(it->next());

            while(!next.isNull())
            {
                if(next.name() == QXmlName(StandardNamespaces::xml, StandardLocalNames::base))
                {
                    const QUrl candidate(next.stringValue());
                    //  TODO. The xml:base spec says to do URI escaping here.

                    if(!candidate.isValid())
                        return QUrl();
                    else if(candidate.isRelative())
                    {
                        const QXmlNodeModelIndex par(parent(ni));

                        if(par.isNull())
                            return baseUri().resolved(candidate);
                        else
                            return par.baseUri().resolved(candidate);
                    }
                    else
                        return candidate;
                }

                next = it->next();
            }

            /* We have no xml:base-attribute. Can any parent supply us a base URI? */
            const QXmlNodeModelIndex par(parent(ni));

            if(par.isNull())
                return baseUri();
            else
                return par.baseUri();
        }
        case QXmlNodeModelIndex::ProcessingInstruction:
        /* Fallthrough. */
        case QXmlNodeModelIndex::Comment:
        /* Fallthrough. */
        case QXmlNodeModelIndex::Attribute:
        /* Fallthrough. */
        case QXmlNodeModelIndex::Text:
        {
            const QXmlNodeModelIndex par(ni.iterate(QXmlNodeModelIndex::AxisParent)->next());
            if(par.isNull())
                return QUrl();
            else
                return par.baseUri();
        }
        case QXmlNodeModelIndex::Namespace:
            return QUrl();
    }

    Q_ASSERT_X(false, Q_FUNC_INFO, "This line is never supposed to be reached.");
    return QUrl();
}

void AccelTree::copyNodeTo(const QXmlNodeModelIndex &node,
                           QAbstractXmlReceiver *const receiver,
                           const NodeCopySettings &settings) const
{
    /* This code piece can be seen as a customized version of
     * QAbstractXmlReceiver::item/sendAsNode(). */
    Q_ASSERT(receiver);
    Q_ASSERT(!node.isNull());

    typedef QHash<QXmlName::PrefixCode, QXmlName::NamespaceCode> Binding;
    QStack<Binding> outputted;

    switch(node.kind())
    {
        case QXmlNodeModelIndex::Element:
        {
            outputted.push(Binding());

            /* Add the namespace for our element name. */
            const QXmlName elementName(node.name());

            receiver->startElement(elementName);

            if(!settings.testFlag(InheritNamespaces))
                receiver->namespaceBinding(QXmlName(StandardNamespaces::StopNamespaceInheritance, 0,
                                                    StandardPrefixes::StopNamespaceInheritance));

            if(settings.testFlag(PreserveNamespaces))
                node.sendNamespaces(receiver);
            else
            {
                /* Find the namespaces that we actually use and add them to outputted. These are drawn
                 * from the element name, and the node's attributes. */
                outputted.top().insert(elementName.prefix(), elementName.namespaceURI());

                const QXmlNodeModelIndex::Iterator::Ptr attributes(iterate(node, QXmlNodeModelIndex::AxisAttribute));
                QXmlNodeModelIndex attr(attributes->next());

                while(!attr.isNull())
                {
                    const QXmlName &attrName = attr.name();
                    outputted.top().insert(attrName.prefix(), attrName.namespaceURI());
                    attr = attributes->next();
                }

                Binding::const_iterator it(outputted.top().constBegin());
                const Binding::const_iterator end(outputted.top().constEnd());

                for(; it != end; ++it)
                    receiver->namespaceBinding(QXmlName(it.value(), 0, it.key()));
            }

            /* Send the attributes of the element. */
            {
                QXmlNodeModelIndex::Iterator::Ptr attributes(node.iterate(QXmlNodeModelIndex::AxisAttribute));
                QXmlNodeModelIndex attribute(attributes->next());

                while(!attribute.isNull())
                {
                    const QString &v = attribute.stringValue();
                    receiver->attribute(attribute.name(), QStringRef(&v));
                    attribute = attributes->next();
                }
            }

            /* Send the children of the element. */
            copyChildren(node, receiver, settings);

            receiver->endElement();
            outputted.pop();
            break;
        }
        case QXmlNodeModelIndex::Document:
        {
            /* We need to intercept and grab the elements of the document node, such
             * that we preserve/inherit preference applies to them. */
            receiver->startDocument();
            copyChildren(node, receiver, settings);
            receiver->endDocument();
            break;
        }
        default:
            receiver->item(node);
    }

}