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124 lines
4.7 KiB
C++
124 lines
4.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL21$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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#ifndef Patternist_GeneralComparison_H
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#define Patternist_GeneralComparison_H
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#include <private/qatomiccomparator_p.h>
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#include <private/qpaircontainer_p.h>
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#include <private/qcomparisonplatform_p.h>
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QT_BEGIN_NAMESPACE
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namespace QPatternist
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{
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/**
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* @short Implements XPath 2.0's general comparions, such as the <tt>=</tt> operator.
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*
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* ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform
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* must access members of GeneralComparison.
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*
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* @see <a href="http://www.w3.org/TR/xpath20/#id-general-comparisons">XML Path Language
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* (XPath) 2.0, 3.5.2 General Comparisons</a>
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* @author Frans Englich <frans.englich@nokia.com>
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* @ingroup Patternist_expressions
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*/
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class GeneralComparison : public PairContainer,
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public ComparisonPlatform<GeneralComparison,
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true /* We want to report errors. */,
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AtomicComparator::AsGeneralComparison>
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{
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public:
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GeneralComparison(const Expression::Ptr &op1,
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const AtomicComparator::Operator op,
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const Expression::Ptr &op2,
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const bool isBackwardsCompat = false);
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virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
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virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
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const SequenceType::Ptr &reqType);
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virtual SequenceType::List expectedOperandTypes() const;
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virtual SequenceType::Ptr staticType() const;
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virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
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/**
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* @returns always IDGeneralComparison
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*/
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virtual ID id() const;
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virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
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/**
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* @returns the operator that this GeneralComparison is using.
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*/
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inline AtomicComparator::Operator operatorID() const
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{
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return m_operator;
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}
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/**
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* Overridden to optimize case-insensitive compares.
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*/
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virtual Expression::Ptr compress(const StaticContext::Ptr &context);
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private:
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static inline void updateType(ItemType::Ptr &type,
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const Expression::Ptr &source);
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AtomicComparator::Ptr fetchGeneralComparator(Expression::Ptr &op1,
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Expression::Ptr &op2,
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const ReportContext::Ptr &context) const;
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bool generalCompare(const Item &op1,
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const Item &op2,
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const DynamicContext::Ptr &context) const;
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const AtomicComparator::Operator m_operator;
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const bool m_isBackwardsCompat;
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};
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}
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QT_END_NAMESPACE
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#endif
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