source: trunk/src/xmlpatterns/expr/qarithmeticexpression.cpp@ 317

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 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
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qboolean_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qgenericsequencetype_p.h"
#include "qliteral_p.h"
#include "qpatternistlocale_p.h"
#include "qschemanumeric_p.h"
#include "quntypedatomicconverter_p.h"

#include "qarithmeticexpression_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ArithmeticExpression::ArithmeticExpression(const Expression::Ptr &op1,
                                           const AtomicMathematician::Operator op,
                                           const Expression::Ptr &op2) : PairContainer(op1, op2)
                                                                       , m_op(op)
                                                                       , m_isCompat(false)
{
}

Item ArithmeticExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operand1->evaluateSingleton(context));
    if(!op1)
        return Item();

    const Item op2(m_operand2->evaluateSingleton(context));
    if(!op2)
        return Item();

    return flexiblyCalculate(op1, m_op, op2, m_mather, context, this,
                             ReportContext::XPTY0004, m_isCompat);
}

/**
 * Since ArithmeticExpression::flexiblyCalculate() creates Expression instances
 * at runtime, we have the problem of having SourceLocationReflections for them
 * in the case that we run into a runtime error, since the locations are always
 * located at compile time.
 *
 * This class simply delegates the reflection over to an existing expression.
 *
 * I only managed to trigger this with "current() + 1", where current()
 * evaluates to an invalid representation for @c xs:double.
 *
 * @since 4.5
 * @author Frans Englich <[email protected]>
 */
class DelegatingReflectionExpression : public Literal
{
public:
    DelegatingReflectionExpression(const Item &item,
                                   const SourceLocationReflection *const reflection) : Literal(item)
                                                                                     , m_reflection(reflection)
    {
    }

    virtual const SourceLocationReflection *actualReflection() const
    {
        return m_reflection;
    }

private:
    const SourceLocationReflection *const m_reflection;