/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QUrl>

#include "qcommonsequencetypes_p.h"
#include "qnodebuilder_p.h"
#include "qqnamevalue_p.h"

#include "qattributeconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

AttributeConstructor::AttributeConstructor(const Expression::Ptr &op1,
                                           const Expression::Ptr &op2) : PairContainer(op1, op2)
{
}

QString AttributeConstructor::processValue(const QXmlName name,
                                           const Item &value)
{
    if(!value)
        return QString();
    else if(name == QXmlName(StandardNamespaces::xml, StandardLocalNames::id))
        return value.stringValue().simplified();
    else
        return value.stringValue();
}

Item AttributeConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item nameItem(m_operand1->evaluateSingleton(context));
    const Item content(m_operand2->evaluateSingleton(context));

    const QXmlName name(nameItem.as<QNameValue>()->qName());
    const QString value(processValue(name, content));
    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));

    nodeBuilder->attribute(name, QStringRef(&value));

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);
    return nm->root(QXmlNodeModelIndex());
}

void AttributeConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    QAbstractXmlReceiver *const receiver = context->outputReceiver();
    const Item nameItem(m_operand1->evaluateSingleton(context));

    const Item content(m_operand2->evaluateSingleton(context));
    const QXmlName name(nameItem.as<QNameValue>()->qName());
    const QString value(processValue(name, content));

    receiver->attribute(name, QStringRef(&value));
}

SequenceType::Ptr AttributeConstructor::staticType() const
{
    return CommonSequenceTypes::ExactlyOneAttribute;
}

SequenceType::List AttributeConstructor::expectedOperandTypes() const
{
    SequenceType::List result;
    result.append(CommonSequenceTypes::ExactlyOneQName);
    result.append(CommonSequenceTypes::ZeroOrMoreItems);
    return result;
}

Expression::Properties AttributeConstructor::properties() const
{
    return DisableElimination | IsNodeConstructor;
}

ExpressionVisitorResult::Ptr
AttributeConstructor::accept(const ExpressionVisitor::Ptr &visitor) const
{
    return visitor->visit(this);
}

Expression::ID AttributeConstructor::id() const
{
    return IDAttributeConstructor;
}

QT_END_NAMESPACE
