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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_Focus_H
#define Patternist_Focus_H
#include <private/qdelegatingdynamiccontext_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short A DynamicContext that maintains the focus, a sequence
* of items.
*
* Focus implements both the outer and inner focus. The focus is one of
* the things that characterizes the XPath language. The focus is what's
* iterated over in a predicate, whose current item can be received
* via the context item expression, <tt>.</tt>(the dot),
* and whose size is retrievable via the function <tt>fn:last()</tt>.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class Focus : public DelegatingDynamicContext
{
public:
Focus(const DynamicContext::Ptr &prevContext);
xsInteger contextPosition() const override;
Item contextItem() const override;
xsInteger contextSize() override;
void setFocusIterator(const Item::Iterator::Ptr &it) override;
Item::Iterator::Ptr focusIterator() const override;
/**
* If there is no top level expression that sets the current item,
* the focus should be used. This implementation ensures that.
*/
Item currentItem() const override;
private:
Item::Iterator::Ptr m_focusIterator;
xsInteger m_contextSizeCached;
};
}
QT_END_NAMESPACE
#endif
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