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Diffstat (limited to 'src/xmlpatterns/expr/qtreatas_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qtreatas_p.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qtreatas_p.h b/src/xmlpatterns/expr/qtreatas_p.h new file mode 100644 index 0000000..ce43e9a --- /dev/null +++ b/src/xmlpatterns/expr/qtreatas_p.h @@ -0,0 +1,122 @@ +/**************************************************************************** +** +** 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_TreatAs_H +#define Patternist_TreatAs_H + +#include "qsinglecontainer_p.h" + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +namespace QPatternist +{ + /** + * @short Implements XPath 2.0's <tt>treat as</tt> expression. + * + * TreatAs is always a compile-time class only, and is always deallocated + * by re-writing to CardinalityVerifier or ItemVerifier or both, by calling + * TypeChecker::applyFunctionConversion(). + * + * + * One approach could be to skip instantiating TreatAs and simply let the + * return value of TypeChecker::applyFunctionConversion() be inserted into + * the AST, but that wouldn't handle type checking the context item + * properly, which depends on that the StaticContext have been set by the + * parent Expression. + * + * @see <a href="http://www.w3.org/TR/xpath20/#id-treat">XML Path Language + * (XPath) 2.0, 3.10.5 Treat</a> + * @author Frans Englich <fenglich@trolltech.com> + * @ingroup Patternist_expressions + */ + class TreatAs : public SingleContainer + { + public: + /** + * Creats a TreatAs where it is checked that the expression @p operand conforms + * to the type @p reqType. + */ + TreatAs(const Expression::Ptr &operand, + const SequenceType::Ptr &reqType); + + /** + * This function rewrites always. First the type that this TreatAs expression tests for + * is verified. Then, the type the <tt>treat as</tt> expression itself must match, @p reqType, + * is verified. + */ + virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, + const SequenceType::Ptr &reqType); + + /** + * @returns always the SequenceType passed in the constructor to this class. That is, the + * SequenceType that the operand must conform to. + */ + virtual SequenceType::Ptr staticType() const; + + /** + * @returns a list containing one CommonSequenceTypes::ZeroOrMoreItems + */ + virtual SequenceType::List expectedOperandTypes() const; + + virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; + + private: + const SequenceType::Ptr m_reqType; + }; +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif |