| /**************************************************************************** |
| ** |
| ** 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: |
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| ** |
| ** 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: |
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| ** 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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| ** $QT_END_LICENSE$ |
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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_ExpressionSequence_H |
| #define Patternist_ExpressionSequence_H |
| |
| #include "qunlimitedcontainer_p.h" |
| |
| QT_BEGIN_HEADER |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Implements the comma(",") operator, the sequence constructor. |
| * |
| * For example, the expression <tt>alpha, beta</tt> evaluates to a sequence |
| * containing the items the nodetest @c alpha evaluates to, concatenated |
| * with the items the nodetest @c beta evaluates to. |
| * |
| * @see <a href="http://www.w3.org/TR/xpath20/#construct_seq">XML Path Language |
| * (XPath) 2.0, 3.3.1 Constructing Sequences</a> |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class ExpressionSequence : public UnlimitedContainer |
| { |
| public: |
| /** |
| * Creates an ExpressionSequence with the operands @p operands. @p operands |
| * must contain two or more Expression instances. |
| */ |
| ExpressionSequence(const Expression::List &operands); |
| |
| virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; |
| |
| /** |
| * Forwards the call to its children. |
| */ |
| virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const; |
| |
| virtual SequenceType::List expectedOperandTypes() const; |
| virtual SequenceType::Ptr staticType() const; |
| |
| /** |
| * Removes any empty sequences, typically "()", from its list of children. If |
| * after that rewrite has no children, it rewrites itself to the CommonValues::empty; |
| * if it has only one, it rewrites to the child. |
| * |
| * This optimization is not very usable by itself, but potentially becomes effective after other |
| * optimizations have rewritten themselves into empty sequences. Thus, |
| * saving memory consumption and runtime overhead. |
| */ |
| virtual Expression::Ptr compress(const StaticContext::Ptr &context); |
| |
| inline Item::Iterator::Ptr mapToSequence(const Expression::Ptr &, |
| const DynamicContext::Ptr &) const; |
| |
| virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType); |
| /** |
| * @returns Expression::DisableElimination, plus the union |
| * of all this ExpressionSequence's children's properties. If any child |
| * does not have IsEvaluated, it is removed from the result. |
| */ |
| virtual Expression::Properties properties() const; |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| virtual ID id() const; |
| private: |
| typedef QExplicitlySharedDataPointer<const ExpressionSequence> ConstPtr; |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| QT_END_HEADER |
| |
| #endif |