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Diffstat (limited to 'src/xmlpatterns/expr/qaxisstep_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qaxisstep_p.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qaxisstep_p.h b/src/xmlpatterns/expr/qaxisstep_p.h new file mode 100644 index 0000000..620824b --- /dev/null +++ b/src/xmlpatterns/expr/qaxisstep_p.h @@ -0,0 +1,168 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtXmlPatterns module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, 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 1.0, 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. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +// +// 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_AxisStep_H +#define Patternist_AxisStep_H + +#include "qemptycontainer_p.h" +#include "qitem_p.h" + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +namespace QPatternist +{ + /** + * @short A step in a path expression that with an axis and a node test evaluates + * to a sequence of nodes from the context item. + * + * @author Frans Englich <fenglich@trolltech.com> + * @ingroup Patternist_expressions + */ + class Q_AUTOTEST_EXPORT AxisStep : public EmptyContainer + { + public: + AxisStep(const QXmlNodeModelIndex::Axis axis, + const ItemType::Ptr &nodeTest); + + virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; + virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; + + /** + * Returns @p node if it matches the node test this step is using, otherwise @c null. + */ + inline Item mapToItem(const QXmlNodeModelIndex &node, + const DynamicContext::Ptr &context) const; + + virtual SequenceType::List expectedOperandTypes() const; + virtual SequenceType::Ptr staticType() const; + + /** + * Rewrites to ParentNodeAxis, if possible. + */ + virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, + const SequenceType::Ptr &reqType); + + /** + * @returns always BuiltinTypes::node; + */ + virtual ItemType::Ptr expectedContextItemType() const; + + virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; + + virtual Properties properties() const; + + /** + * @returns the axis this step is using. + */ + QXmlNodeModelIndex::Axis axis() const; + + /** + * @returns the node test this step is using. + */ + inline ItemType::Ptr nodeTest() const + { + return m_nodeTest; + } + + void setNodeTest(const ItemType::Ptr &nev) + { + m_nodeTest = nev; + } + + /** + * @short Prints the EBNF name corresponding to @p axis. + * + * For instance, for QXmlNodeModelIndex::Child, "child" is returned. + * + * Apart from being used in this class, it is used in the SDK. + */ + static QString axisName(const QXmlNodeModelIndex::Axis axis); + + virtual ID id() const; + virtual PatternPriority patternPriority() const; + + inline void setAxis(const QXmlNodeModelIndex::Axis newAxis); + + private: + typedef QExplicitlySharedDataPointer<const AxisStep> ConstPtr; + + static const QXmlNodeModelIndex::NodeKind s_whenAxisNodeKindEmpty[]; + + /** + * @returns @c true when the axis @p axis and a node test testing node of + * type @p nodeKind always produces an empty sequence. One such example + * is <tt>attribute::comment()</tt>. + */ + static bool isAlwaysEmpty(const QXmlNodeModelIndex::Axis axis, + const QXmlNodeModelIndex::NodeKind nodeKind); + + /** + * The reason this variable is mutable, is that in the case of XSL-T patterns, + * we do quite some reordering. + */ + QXmlNodeModelIndex::Axis m_axis; + ItemType::Ptr m_nodeTest; + }; + + void AxisStep::setAxis(const QXmlNodeModelIndex::Axis newAxis) + { + m_axis = newAxis; + } + +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif |