| /**************************************************************************** |
| ** |
| ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
| ** All rights reserved. |
| ** Contact: Nokia Corporation (qt-info@nokia.com) |
| ** |
| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
| ** 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 |
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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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| ** $QT_END_LICENSE$ |
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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_GenericPredicate_H |
| #define Patternist_GenericPredicate_H |
| |
| #include "qpaircontainer_p.h" |
| |
| QT_BEGIN_HEADER |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short A predicate that can handle all kinds of predicates and |
| * is therefore not very efficient, but can cope with all the tricky scenarios. |
| * |
| * @see FirstItemPredicate |
| * @see TruthPredicate |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class GenericPredicate : public PairContainer |
| { |
| public: |
| |
| /** |
| * Creates a predicate expression that filters the items gained |
| * from evaluating @p sourceExpression through the filter @p predicateExpression. |
| * |
| * This function performs type analyzis on the passed expressions, and may |
| * return more specialized expressions depending on the analyzis. |
| * |
| * If @p predicateExpression is an invalid predicate, an error is issued |
| * via the @p context. |
| */ |
| static Expression::Ptr create(const Expression::Ptr &sourceExpression, |
| const Expression::Ptr &predicateExpression, |
| const StaticContext::Ptr &context, |
| const QSourceLocation &location); |
| |
| static Expression::Ptr createFirstItem(const Expression::Ptr &sourceExpression); |
| |
| /** |
| * Creates a source iterator which is passed to the ItemMappingIterator |
| * and the Focus. The ItemMappingIterator modifies it with |
| * its QAbstractXmlForwardIterator::next() calls, and since the Focus references the same QAbstractXmlForwardIterator, |
| * the focus is automatically moved. |
| */ |
| virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const; |
| |
| /** |
| * Doesn't return the first item from calling evaluateSequence(), but does the mapping |
| * manually. This avoid allocating an ItemMappingIterator. |
| */ |
| virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const; |
| |
| inline Item mapToItem(const Item &subject, |
| const DynamicContext::Ptr &) const; |
| |
| virtual SequenceType::List expectedOperandTypes() const; |
| virtual SequenceType::Ptr staticType() const; |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| virtual ID id() const; |
| |
| /** |
| * @returns always CreatesFocusForLast. |
| */ |
| virtual Properties properties() const; |
| |
| virtual QString description() const; |
| |
| protected: |
| |
| /** |
| * Creates a GenericPredicate which filters the items from the @p sourceExpression |
| * through @p predicate. |
| * |
| * This constructor is protected. The proper way to create predicates is via the static |
| * create() function. |
| */ |
| GenericPredicate(const Expression::Ptr &sourceExpression, |
| const Expression::Ptr &predicate); |
| |
| /** |
| * @returns the ItemType of the first operand's staticType(). |
| */ |
| virtual ItemType::Ptr newFocusType() const; |
| |
| private: |
| typedef QExplicitlySharedDataPointer<const GenericPredicate> ConstPtr; |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| QT_END_HEADER |
| |
| #endif |