| /**************************************************************************** |
| ** |
| ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
| ** All rights reserved. |
| ** Contact: Nokia Corporation (qt-info@nokia.com) |
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| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
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| ** rights. These rights are described in the Nokia Qt LGPL Exception |
| ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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| ** 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 |
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| ** file. Please review the following information to ensure the GNU General |
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| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
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| ** $QT_END_LICENSE$ |
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| ****************************************************************************/ |
| |
| // |
| // 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 |