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Diffstat (limited to 'src/xmlpatterns/expr/qpath_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qpath_p.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qpath_p.h b/src/xmlpatterns/expr/qpath_p.h new file mode 100644 index 0000000000..cc2d5d5ed2 --- /dev/null +++ b/src/xmlpatterns/expr/qpath_p.h @@ -0,0 +1,176 @@ +/**************************************************************************** +** +** 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_Path_H +#define Patternist_Path_H + +#include "qpaircontainer_p.h" + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +namespace QPatternist +{ + + /** + * @short Implements the path expression, containing two steps, such as in <tt>html/body</tt>. + * + * @see <a href="http://www.w3.org/TR/xquery/#id-path-expressions">XQuery 1.0: An + * XML Query Language, 3.2 Path Expressions</a> + * @author Frans Englich <fenglich@trolltech.com> + * @ingroup Patternist_expressions + */ + class Path : public PairContainer + { + public: + enum Kind + { + /** + * This Path is a plain old path expression as found in XPath. + * Sorting is performed, and atomics are disallowed as left + * operand. + */ + RegularPath = 1, + + /** + * This Path emulates an @c xsl:for-each instruction. This means no + * sorting of result, and atomics are allowed as left operand. + */ + XSLTForEach, + + /** + * This Path performs the iteration in an @c xsl:apply-templates + * instruction. This means sorting, and atomics are disallowed + * as left operand. + */ + ForApplyTemplate + }; + + Path(const Expression::Ptr &operand1, + const Expression::Ptr &operand2, + const Kind kind = RegularPath); + + virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const; + virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const; + virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const; + inline Item::Iterator::Ptr mapToSequence(const Item &item, + const DynamicContext::Ptr &context) const; + + virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, + const SequenceType::Ptr &reqType); + + virtual SequenceType::List expectedOperandTypes() const; + + /** + * @returns the static type of the last step where the cardinality is multiplied with + * the cardinality of the first step's cardinality. + */ + virtual SequenceType::Ptr staticType() const; + + virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; + + virtual Properties properties() const; + + virtual Expression::Ptr compress(const StaticContext::Ptr &context); + + /** + * @returns the item type of the last step's static type. + */ + virtual ItemType::Ptr newFocusType() const; + + virtual ID id() const; + + inline void setLast(); + + inline Kind kind() const + { + return m_kind; + } + + private: + typedef QExplicitlySharedDataPointer<const Path> ConstPtr; + + /** + * One might think this block exists for preventing multiple + * NodeSortExpressions to be created. However, that is not an issue, + * since NodeSortExpression optimizes this away anyway. + * + * The real reason is to avoid infinite recursion. When our typeCheck() + * forwards on the type check to the just created + * NodeSortExpression, it in turn calls typeCheck() on its child, which + * is this Path. Rince and repeat. + * + * We only create node sorts when we're a regular path expression, and + * not when standing in as a generic map expression. */ + bool m_hasCreatedSorter; + + /** + * Whether this path is the step. For instance, in <tt>a/b/c</tt>, the + * last path has @c c as the right operand. + */ + bool m_isLast; + + bool m_checkXPTY0018; + const Kind m_kind; + }; + + void Path::setLast() + { + m_isLast = true; + } +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif |