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/****************************************************************************
**
** Copyright (C) 2009 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_DocumentFN_H
#define Patternist_DocumentFN_H
#include "qfunctioncall_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements XSL-T's function <tt>fn:document()</tt>.
*
* @c fn:document() has no evaluation functions, because it rewrites
* itself to a set of expressions that is the implementation.
*
* The two-argument version:
*
* <tt>document($uris as item()*, $baseURINode as node()) as node()*</tt>
*
* is rewritten into:
*
* <tt>for $uri in distinct-values($uris)
* return doc(resolve-uri($uri, base-uri($baseURINode)))</tt>
*
* and the single version argument:
*
* <tt>document($uris as item()*) as node()*</tt>
*
* is rewritten into:
*
* <tt>for $uri in distinct-values($uris)
* return doc($uri)</tt>
*
* The distinct-values() call ensures the node deduplication and sorting,
* although it fails in the case that URIs resolve/directs in some way to
* the same document. Some of those cases can be solved by wrapping the
* whole expression with a node deduplication(conceptually the-for-loop/.).
* One advantage with distinct-values() over generating traditional node
* sorting/deduplication code is that the latter contains node sorting
* which is uecessary and can be hard to analyze away. distinct-values()
* doesn't have this problem due to its narrower task..
*
* This works without problems, assuming XTRE1160 is not raised and that
* the recover action instead is ignore. In the case XTRE1160 is raised,
* one must cater for this.
*
* In addition to this, both signatures has its first argument changed to
* type <tt>xs:string*</tt>, in order to generate atomization code.
*
* One notable thing is that the expression for $baseURINode, is moved
* inside a loop, and will be evaluated repeatedly, unless moved out as
* part of optimization.
*
* @ingroup Patternist_functions
* @author Frans Englich <frans.englich@nokia.com>
* @since 4.5
*/
class DocumentFN : public FunctionCall
{
public:
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
