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

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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**

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

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

#ifndef Patternist_QNameConstructor_H

#define Patternist_QNameConstructor_H

#include "qsinglecontainer_p.h"

#include "qbuiltintypes_p.h"

#include "qpatternistlocale_p.h"

#include "qxpathhelper_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    /**

     * @short Creates an @c xs:QName value from a lexical QName using

     * statically known namespace bindings.

     *

     * @see QQNameValue

     * @see QXmlUtils

     * @author Frans Englich <frans.englich@nokia.com>

     * @ingroup Patternist_expressions

     */

    class QNameConstructor : public SingleContainer

    {

    public:

        QNameConstructor(const Expression::Ptr &source,

                         const NamespaceResolver::Ptr &nsResolver);

        virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;

        virtual SequenceType::List expectedOperandTypes() const;

        virtual SequenceType::Ptr staticType() const;

        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;

        /**

         * Expands @p lexicalQName, which is a lexical representation of a QName such as "x:body", into

         * a QName using @p nsResolver to supply the namespace bindings.

         *

         * If @p lexicalQName is lexically invalid @p InvalidQName is raised via @p context, or if

         * no namespace binding does not exists for a prefix(if any) in @p lexicalQName, @p NoBinding

         * is raised via @p context.

         *

         * If @p asForAttribute is @c true, the name is considered to be for an

         * attribute in some way, and @p lexicalQName will not pick up the

         * default namespace if it doesn't have a prefix.

         *

         * @p nsResolver is parameterized meaning the function can be instantiated with either

         * DynamicContext or StaticContext.

         *

         * @see QQNameValue

         * @see QXmlUtils

         */

        template<typename TReportContext,

                 const ReportContext::ErrorCode InvalidQName,

                 const ReportContext::ErrorCode NoBinding>

        static

        QXmlName expandQName(const QString &lexicalQName,

                             const TReportContext &context,

                             const NamespaceResolver::Ptr &nsResolver,

                             const SourceLocationReflection *const r,

                             const bool asForAttribute = false);

        /**

         * Resolves the namespace prefix @p prefix to its namespace if it exists, or

         * raised ReportContext::XPST0081 otherwise.

         *

         * @returns the namespace URI corresponding to @p prefix

         */

        static QXmlName::NamespaceCode namespaceForPrefix(const QXmlName::PrefixCode prefix,

                                                          const StaticContext::Ptr &context,

                                                          const SourceLocationReflection *const r);

        virtual const SourceLocationReflection *actualReflection() const;

    private:

        const NamespaceResolver::Ptr m_nsResolver;

    };

    template<typename TReportContext,

             const ReportContext::ErrorCode InvalidQName,

             const ReportContext::ErrorCode NoBinding>

    QXmlName QNameConstructor::expandQName(const QString &lexicalQName,

                                           const TReportContext &context,

                                           const NamespaceResolver::Ptr &nsResolver,

                                           const SourceLocationReflection *const r,

                                           const bool asForAttribute)

    {

        Q_ASSERT(nsResolver);

        Q_ASSERT(context);

        if(XPathHelper::isQName(lexicalQName))

        {

            QString prefix;

            QString local;

            XPathHelper::splitQName(lexicalQName, prefix, local);

            const QXmlName::NamespaceCode nsCode = asForAttribute && prefix.isEmpty() ? QXmlName::NamespaceCode(StandardNamespaces::empty)

                                                                                   : (nsResolver->lookupNamespaceURI(context->namePool()->allocatePrefix(prefix)));

            if(nsCode == NamespaceResolver::NoBinding)

            {

                context->error(QtXmlPatterns::tr("No namespace binding exists for "

                                  "the prefix %1 in %2").arg(formatKeyword(prefix),

                                                             formatKeyword(lexicalQName)),

                               NoBinding,

                               r);

                return QXmlName(); /* Silence compiler warning. */

            }

            else

                return context->namePool()->allocateQName(context->namePool()->stringForNamespace(nsCode), local, prefix);

        }

        else

        {

            context->error(QtXmlPatterns::tr("%1 is an invalid %2")

                              .arg(formatData(lexicalQName))

                              .arg(formatType(context->namePool(), BuiltinTypes::xsQName)),

                           InvalidQName,

                           r);

            return QXmlName(); /* Silence compiler warning. */

        }

    }

}

QT_END_NAMESPACE

QT_END_HEADER

#endif