C++ (Cpp) Ptr::isEvaluated示例

示例#1

Expression::Ptr SubsequenceFN::compress(const StaticContext::Ptr &context)
{
    const Expression::Ptr me(FunctionCall::compress(context));
    if(me != this)
        return me;

    const Expression::Ptr lenArg(m_operands.value(2));
    if(lenArg && lenArg->isEvaluated())
    {
        const xsInteger length = lenArg->as<Literal>()->item().as<Numeric>()->round()->toInteger();

        if(length <= 0)
            return EmptySequence::create(this, context);
    }

    return me;
}

示例#2

Expression::Ptr DocFN::typeCheck(const StaticContext::Ptr &context,
                                 const SequenceType::Ptr &reqType)
{
    /* See the doxygen documentation for this function for the explanation
     * to why this implementation is here, as opposed to in
     * qsequencegeneratingfns.cpp. */

    Q_ASSERT(context);

    prepareStaticBaseURI(context);

    const Expression::Ptr uriOp(m_operands.first());

    if(!uriOp->isEvaluated())
        return Expression::Ptr(FunctionCall::typeCheck(context, reqType));

    const Item uriItem(uriOp->evaluateSingleton(context->dynamicContext()));

    if(!uriItem)
        return EmptySequence::create(this, context)->typeCheck(context, reqType); // TODO test this

    /* These two lines were previously in a separate function but are now duplicated
     * in DocFN::evaluateSingleton(), as part of a workaround for solaris-cc-64. */
    const QUrl mayRela(AnyURI::toQUrl<ReportContext::FODC0005>(uriItem.stringValue(), context, this));
    const QUrl uri(context->resolveURI(mayRela, staticBaseURI()));

    /* The URI is supplied statically, so, let's try to be clever. */
    Q_ASSERT_X(context->resourceLoader(), Q_FUNC_INFO,
               "No resource loader is set in the StaticContext.");
    m_type = context->resourceLoader()->announceDocument(uri, ResourceLoader::MayUse);

    if(m_type)
    {
        Q_ASSERT(CommonSequenceTypes::ZeroOrOneDocumentNode->matches(m_type));
        return Expression::Ptr(FunctionCall::typeCheck(context, reqType));
    }
    else
    {
        context->error(QtXmlPatterns::tr("It will not be possible to retrieve %1.").arg(formatURI(uri)),
                       ReportContext::FODC0002, this);
        return Expression::Ptr();
    }
}