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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_NodeComparison_H
#define Patternist_NodeComparison_H
#include <private/qpaircontainer_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements the node comparison operators <tt>\>\></tt>, <tt>\<\<</tt>, and @c is.
*
* @see <a href="http://www.w3.org/TR/xpath20/#id-node-comparisons">XML Path Language
* (XPath) 2.0, 3.5.3 QXmlNodeModelIndex Comparisons</a>
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class Q_AUTOTEST_EXPORT NodeComparison : public PairContainer
{
public:
NodeComparison(const Expression::Ptr &operand1,
const QXmlNodeModelIndex::DocumentOrder op,
const Expression::Ptr &operand2);
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
virtual SequenceType::List expectedOperandTypes() const;
virtual QXmlNodeModelIndex::DocumentOrder operatorID() const;
/**
* If any operator is the empty sequence, the NodeComparison rewrites
* into that, since the empty sequence is always the result in that case.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
/**
* @returns either CommonSequenceTypes::ZeroOrOneBoolean or
* CommonSequenceTypes::ExactlyOneBoolean depending on the static
* cardinality of its operands.
*/
virtual SequenceType::Ptr staticType() const;
/**
* Determines the string representation for a node comparison operator.
*
* @returns
* - "<<" if @p op is Precedes
* - ">>" if @p op is Follows
* - "is" if @p op is Is
*/
static QString displayName(const QXmlNodeModelIndex::DocumentOrder op);
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
private:
enum Result
{
Empty,
True,
False
};
inline Result evaluate(const DynamicContext::Ptr &context) const;
const QXmlNodeModelIndex::DocumentOrder m_op;
};
}
QT_END_NAMESPACE
#endif
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