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Diffstat (limited to 'src/xmlpatterns/expr/qexpressionsequence_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qexpressionsequence_p.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qexpressionsequence_p.h b/src/xmlpatterns/expr/qexpressionsequence_p.h new file mode 100644 index 0000000..5074489 --- /dev/null +++ b/src/xmlpatterns/expr/qexpressionsequence_p.h @@ -0,0 +1,127 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 Technology Preview License Agreement accompanying +** this package. +** +** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@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_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 |