| /**************************************************************************** |
| ** |
| ** 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 |
| ** 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. |
| ** |
| ** 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 |
| ** and appearing in the file LICENSE.GPL included in the packaging of this |
| ** file. Please review the following information to ensure the GNU General |
| ** Public License version 3.0 requirements will be met: |
| ** http://www.gnu.org/copyleft/gpl.html. |
| ** |
| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
| ** conditions contained in a signed written agreement between you and Nokia. |
| ** |
| ** |
| ** |
| ** |
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| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| // |
| // 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_UnlimitedContainer_H |
| #define Patternist_UnlimitedContainer_H |
| |
| #include <QList> |
| #include "qexpression_p.h" |
| #include "qgenericsequencetype_p.h" |
| |
| QT_BEGIN_HEADER |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Base class for expressions that has any amount of operands. |
| * |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class UnlimitedContainer : public Expression |
| { |
| public: |
| /** |
| * Creates an UnlimitedContainer containing the operands @p operands. @p operands |
| * may be empty. |
| */ |
| UnlimitedContainer(const Expression::List &operands = Expression::List()); |
| |
| virtual void setOperands(const Expression::List &list); |
| |
| virtual Expression::List operands() const; |
| |
| /** |
| * @note This function cannot be called before setOperands is called. |
| */ |
| virtual bool compressOperands(const StaticContext::Ptr &); |
| |
| /** |
| * Tells how operandsUnionType() should compute the cardinality of |
| * its children. |
| * |
| * This type is public because of a bug in the HP-UX aCC compiler. |
| */ |
| enum CardinalityComputation |
| { |
| ProductOfCardinality, |
| UnionOfCardinality |
| }; |
| |
| protected: |
| /** |
| * Computes and returns the union type of all the Expression instances |
| * in this Expression's operands. |
| * |
| * This implementation is placed inside because CardinalityComputation |
| * can't be referenced from the outside(in conforming compilers). |
| */ |
| template<CardinalityComputation suppliedCard> |
| inline |
| SequenceType::Ptr operandsUnionType() const |
| { |
| Q_ASSERT(suppliedCard == ProductOfCardinality || suppliedCard == UnionOfCardinality); |
| const Expression::List::const_iterator end(m_operands.constEnd()); |
| Expression::List::const_iterator it(m_operands.constBegin()); |
| |
| /* Load the first one, and jump over it in the loop. */ |
| SequenceType::Ptr t(m_operands.first()->staticType()); |
| ItemType::Ptr type(t->itemType()); |
| Cardinality card(t->cardinality()); |
| ++it; |
| |
| for(; it != end; ++it) |
| { |
| t = (*it)->staticType(); |
| type |= t->itemType(); |
| |
| /* Since this function is a template function, it doesn't |
| * hurt performance that this test is inside the loop. */ |
| if(suppliedCard == ProductOfCardinality) |
| card += t->cardinality(); |
| else |
| card |= t->cardinality(); |
| } |
| |
| return makeGenericSequenceType(type, card); |
| } |
| |
| Expression::List m_operands; |
| }; |
| |
| |
| } |
| |
| QT_END_NAMESPACE |
| |
| QT_END_HEADER |
| |
| #endif |