/**************************************************************************** | |
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** Contact: Nokia Corporation (qt-info@nokia.com) | |
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** This file is part of the QtXmlPatterns module of the Qt Toolkit. | |
** | |
** $QT_BEGIN_LICENSE:LGPL$ | |
** GNU Lesser General Public License Usage | |
** 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 | |
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** file. Please review the following information to ensure the GNU Lesser | |
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** rights. These rights are described in the Nokia Qt LGPL Exception | |
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. | |
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** 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 | |
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** file. Please review the following information to ensure the GNU General | |
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// | |
// 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 |