C++ Ptr::outputReceiver方法代码示例

void DocumentConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    QAbstractXmlReceiver *const receiver = context->outputReceiver();

    DocumentContentValidator validator(receiver, context, ConstPtr(this));

    const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));

    validator.startDocument();
    m_operand->evaluateToSequenceReceiver(receiverContext);
    validator.endDocument();
}

void ComputedNamespaceConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    const Item prefixItem(m_operand1->evaluateSingleton(context));
    const QString prefix(prefixItem ? prefixItem.stringValue() : QString());

    const Item namespaceItem(m_operand2->evaluateSingleton(context));
    const QString namespaceURI(namespaceItem ? namespaceItem.stringValue() : QString());

    if(namespaceURI.isEmpty())
    {
        context->error(QtXmlPatterns::tr("In a namespace constructor, the value for a namespace cannot be an empty string."),
                       ReportContext::XTDE0930,
                       this);
    }

    /* One optimization could be to store a pointer to
     * the name pool as a member in order to avoid the virtual call(s). */
    const NamePool::Ptr np(context->namePool());

    if(!prefix.isEmpty() && !QXmlUtils::isNCName(prefix))
    {
        context->error(QtXmlPatterns::tr("The prefix must be a valid %1, which %2 is not.")
                                        .arg(formatType(np, BuiltinTypes::xsNCName),
                                             formatKeyword(prefix)),
                       ReportContext::XTDE0920,
                       this);
    }
    const QXmlName binding(np->allocateBinding(prefix, namespaceURI));

    AnyURI::toQUrl<ReportContext::XTDE0905, DynamicContext::Ptr>(namespaceURI,
                                                                 context,
                                                                 this);

    if(binding.prefix() == StandardPrefixes::xmlns)
    {
        context->error(QtXmlPatterns::tr("The prefix %1 cannot be bound.")
                                        .arg(formatKeyword(prefix)),
                       ReportContext::XTDE0920,
                       this);
    }

    if((binding.prefix() == StandardPrefixes::xml && binding.namespaceURI() != StandardNamespaces::xml)
       ||
       (binding.prefix() != StandardPrefixes::xml && binding.namespaceURI() == StandardNamespaces::xml))
    {
        context->error(QtXmlPatterns::tr("Only the prefix %1 can be bound to %2 and vice versa.")
                                        .arg(formatKeyword(prefix), formatKeyword(namespaceURI)),
                       ReportContext::XTDE0925,
                       this);
    }

     context->outputReceiver()->namespaceBinding(binding);
}

void Expression::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    QAbstractXmlReceiver *const receiver = context->outputReceiver();
    const Item::Iterator::Ptr it(evaluateSequence(context));
    Item next(it->next());

    while(next)
    {
        receiver->item(next);
        next = it->next();
    }
}

void TextNodeConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    const Item item(m_operand->evaluateSingleton(context));

    QAbstractXmlReceiver *const receiver = context->outputReceiver();

    if(item)
    {
        const QString &v = item.stringValue();
        receiver->characters(QStringRef(&v));
    }
    else
        receiver->characters(QStringRef());
}

void ElementConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    /* We create an OutputValidator here too. If we're serializing(a common case, unfortunately)
     * the receiver is already validating in order to catch cases where a computed attribute
     * constructor is followed by an element constructor, but in the cases where we're not serializing
     * it's necessary that we validate in this step. */
    const Item name(m_operand1->evaluateSingleton(context));
    QAbstractXmlReceiver *const receiver = context->outputReceiver();

    OutputValidator validator(receiver, context, this);
    const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));

    receiver->startElement(name.as<QNameValue>()->qName());
    m_operand2->evaluateToSequenceReceiver(receiverContext);
    receiver->endElement();
}

void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
    QAbstractXmlReceiver *const receiver = context->outputReceiver();
    Item next(it->next());

    while(next)
    {
        if(next.isNode())
        {
            const QXmlNodeModelIndex &asNode = next.asNode();
            asNode.model()->copyNodeTo(asNode, receiver, m_settings);
        }
        else
            receiver->item(next);

        next = it->next();
    }
}

void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    /* Optimization: this completely breaks streaming. We get a call to
     * evaluateToSequenceReceiver() but we require heap allocations by calling
     * evaluateSequence(). */

    const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
    QAbstractXmlReceiver *const receiver = context->outputReceiver();
    Item next(it->next());

    while(next)
    {
        if(next.isNode())
        {
            const QXmlNodeModelIndex &asNode = next.asNode();
            asNode.model()->copyNodeTo(asNode, receiver, m_settings);
        }
        else
            receiver->item(next);

        next = it->next();
    }
}

void NamespaceConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    context->outputReceiver()->namespaceBinding(m_binding);
}

void Literal::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    context->outputReceiver()->item(m_item);
}

void ProcessingInstructionConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    QAbstractXmlReceiver *const receiver = context->outputReceiver();

    receiver->processingInstruction(evaluateTardata(context), data(context));
}