Пример #1
0
Expression::Ptr FunctionCall::typeCheck(const StaticContext::Ptr &context,
                                        const SequenceType::Ptr &reqType)
{
    /* We don't cache properties() at some stages because it can be invalidated
     * by the typeCheck(). */

    const FunctionSignature::Arity maxArgs = signature()->maximumArguments();
    /* We do this before the typeCheck() such that the appropriate conversions
     * are applied to the ContextItem. */
    if(m_operands.count() < maxArgs &&
       has(UseContextItem))
    {
        m_operands.append(Expression::Ptr(new ContextItem()));
        context->addLocation(m_operands.last().data(), context->locationFor(this));
    }

    const Expression::Ptr me(UnlimitedContainer::typeCheck(context, reqType));
    if(me.data() != this)
        return me;

    const Properties props(properties());

    if((props & RewriteToEmptyOnEmpty) == RewriteToEmptyOnEmpty &&
       *CommonSequenceTypes::Empty == *m_operands.first()->staticType()->itemType())
    {
        return EmptySequence::create(this, context);
    }

    if((props & LastOperandIsCollation) == LastOperandIsCollation &&
       m_operands.count() == maxArgs)
    {
        m_operands.last() = Expression::Ptr(new CollationChecker(m_operands.last()));
        context->addLocation(m_operands.last().data(), context->locationFor(this));
    }

    return me;
}
Пример #2
0
Expression::Ptr DocumentFN::typeCheck(const StaticContext::Ptr &context,
                                      const SequenceType::Ptr &reqType)
{
    /* See the class documentation for the rewrite that we're doing here. */

    /* Generate type checking code for our operands such that they match. */
    typeCheckOperands(context);

    const QSourceLocation myLocation(context->locationFor(this));
    const FunctionFactory::Ptr functions(context->functionSignatures());

    Expression::Ptr uriSource;

    {
        Expression::List distinctValuesArgs;
        distinctValuesArgs.append(m_operands.first());

        uriSource = functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::distinct_values),
                    distinctValuesArgs,
                    context,
                    this);
        context->addLocation(uriSource.data(), myLocation);
    }

    const VariableSlotID rangeSlot = context->allocateRangeSlot();
    const Expression::Ptr uriReference(new RangeVariableReference(uriSource, rangeSlot));
    context->addLocation(uriReference.data(), myLocation);

    Expression::List docArgs;

    if(m_operands.count() == 2)
    {
        Expression::List baseUriArgs;
        baseUriArgs.append(uriReference);
        baseUriArgs.append(m_operands.at(1));

        const Expression::Ptr fnBaseUri(functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::resolve_uri),
                                        baseUriArgs,
                                        context,
                                        this));
        context->addLocation(fnBaseUri.data(), myLocation);
        docArgs.append(fnBaseUri);
    }
    else
        docArgs.append(uriReference);

    const Expression::Ptr fnDoc(functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::doc),
                                docArgs,
                                context,
                                this));
    context->addLocation(fnDoc.data(), myLocation);


    Expression::Ptr newMe(new ForClause(rangeSlot,
                                        uriSource,
                                        fnDoc,
                                        -1 /* We have no position variable. */));

    Expression::Ptr oldMe(this);
    rewrite(oldMe, newMe, context);
    return newMe->typeCheck(context, reqType);
}