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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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****************************************************************************/

#include "qanyuri_p.h"

#include "qbuiltintypes_p.h"

#include "qcommonsequencetypes_p.h"

#include "qpatternistlocale_p.h"

#include "private/qxmlutils_p.h"

#include "qcomputednamespaceconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ComputedNamespaceConstructor::ComputedNamespaceConstructor(const Expression::Ptr &prefix,

                                                           const Expression::Ptr &namespaceURI) : PairContainer(prefix, namespaceURI)

{

}

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);

}

SequenceType::Ptr ComputedNamespaceConstructor::staticType() const

{

    return CommonSequenceTypes::ExactlyOneAttribute;

}

SequenceType::List ComputedNamespaceConstructor::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrOneString);

    result.append(CommonSequenceTypes::ZeroOrOneString);

    return result;

}

Expression::Properties ComputedNamespaceConstructor::properties() const

{

    return DisableElimination | IsNodeConstructor;

}

ExpressionVisitorResult::Ptr ComputedNamespaceConstructor::accept(const ExpressionVisitor::Ptr &visitor) const

{

    return visitor->visit(this);

}

QT_END_NAMESPACE