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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_ValueComparison_H
#define Patternist_ValueComparison_H
#include "qatomiccomparator_p.h"
#include "qpaircontainer_p.h"
#include "qcomparisonplatform_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements XPath 2.0 value comparions, such as the <tt>eq</tt> operator.
*
* ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform
* must access members of ValueComparison.
*
* @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">XML Path Language
* (XPath) 2.0, 3.5.1 Value Comparisons</a>
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class ValueComparison : public PairContainer,
public ComparisonPlatform<ValueComparison, true>
{
public:
ValueComparison(const Expression::Ptr &op1,
const AtomicComparator::Operator op,
const Expression::Ptr &op2);
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
/**
* @returns always CommonSequenceTypes::ExactlyOneBoolean
*/
virtual SequenceType::Ptr staticType() const;
virtual SequenceType::List expectedOperandTypes() const;
/**
* @returns IDValueComparison
*/
virtual ID id() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
/**
* Overridden to optimize case-insensitive compares.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
/**
* @returns the operator that this ValueComparison is using.
*/
inline AtomicComparator::Operator operatorID() const
{
return m_operator;
}
/**
* It is considered that the string value from @p op1 will be compared against @p op2. This
* function determines whether the user intends the comparison to be case insensitive. If
* that is the case @c true is returned, and the operands are re-written appropriately.
*
* This is a helper function for Expression classes that compares strings.
*
* @see ComparisonPlatform::useCaseInsensitiveComparator()
*/
static bool isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2);
private:
const AtomicComparator::Operator m_operator;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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