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#include "qcommonsequencetypes_p.h"

#include "qdelegatingnamespaceresolver_p.h"

#include "qnamespaceconstructor_p.h"

#include "qnodebuilder_p.h"

#include "qoutputvalidator_p.h"

#include "qqnamevalue_p.h"

#include "qstaticnamespacecontext_p.h"

#include "qelementconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ElementConstructor::ElementConstructor(const Expression::Ptr &op1,

                                       const Expression::Ptr &op2,

                                       const bool isXSLT) : PairContainer(op1, op2)

                                                          , m_isXSLT(isXSLT)

{

}

Item ElementConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const

{

    const Item name(m_operand1->evaluateSingleton(context));

    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(m_staticBaseURI));

    OutputValidator validator(nodeBuilder.data(), context, this, m_isXSLT);

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

    nodeBuilder->startElement(name.as<QNameValue>()->qName());

    m_operand2->evaluateToSequenceReceiver(receiverContext);

    nodeBuilder->endElement();

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());

    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());

}

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, m_isXSLT);

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

    receiver->startElement(name.as<QNameValue>()->qName());

    m_operand2->evaluateToSequenceReceiver(receiverContext);

    receiver->endElement();

}

Expression::Ptr ElementConstructor::typeCheck(const StaticContext::Ptr &context,

                                              const SequenceType::Ptr &reqType)

{

    /* What does this code do? When type checking our children, our namespace

     * bindings, which are also children of the form of NamespaceConstructor

     * instances, must be statically in-scope for them, so find them and

     * shuffle their bindings into the StaticContext. */

    m_staticBaseURI = context->baseURI();

    /* Namespace declarations changes the in-scope bindings, so let's

     * first lookup our child NamespaceConstructors. */

    const ID operandID = m_operand2->id();

    NamespaceResolver::Bindings overrides;

    if(operandID == IDExpressionSequence)

    {

        const Expression::List operands(m_operand2->operands());

        const int len = operands.count();

        for(int i = 0; i < len; ++i)

        {

            if(operands.at(i)->is(IDNamespaceConstructor))

            {

                const QXmlName &nb = operands.at(i)->as<NamespaceConstructor>()->namespaceBinding();

                overrides.insert(nb.prefix(), nb.namespaceURI());

            }

        }

    }

    const NamespaceResolver::Ptr newResolver(new DelegatingNamespaceResolver(context->namespaceBindings(), overrides));

    const StaticContext::Ptr augmented(new StaticNamespaceContext(newResolver, context));

    return PairContainer::typeCheck(augmented, reqType);

}

SequenceType::Ptr ElementConstructor::staticType() const

{

    return CommonSequenceTypes::ExactlyOneElement;

}

SequenceType::List ElementConstructor::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ExactlyOneQName);

    result.append(CommonSequenceTypes::ZeroOrMoreItems);

    return result;

}

Expression::Properties ElementConstructor::properties() const

{

    return DisableElimination | IsNodeConstructor;

}

ExpressionVisitorResult::Ptr

ElementConstructor::accept(const ExpressionVisitor::Ptr &visitor) const

{

    return visitor->visit(this);

}

QT_END_NAMESPACE