1 /****************************************************************************
3 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/
6 ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** GNU Lesser General Public License Usage
10 ** This file may be used under the terms of the GNU Lesser General Public
11 ** License version 2.1 as published by the Free Software Foundation and
12 ** appearing in the file LICENSE.LGPL included in the packaging of this
13 ** file. Please review the following information to ensure the GNU Lesser
14 ** General Public License version 2.1 requirements will be met:
15 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
17 ** In addition, as a special exception, Nokia gives you certain additional
18 ** rights. These rights are described in the Nokia Qt LGPL Exception
19 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
21 ** GNU General Public License Usage
22 ** Alternatively, this file may be used under the terms of the GNU General
23 ** Public License version 3.0 as published by the Free Software Foundation
24 ** and appearing in the file LICENSE.GPL included in the packaging of this
25 ** file. Please review the following information to ensure the GNU General
26 ** Public License version 3.0 requirements will be met:
27 ** http://www.gnu.org/copyleft/gpl.html.
30 ** Alternatively, this file may be used in accordance with the terms and
31 ** conditions contained in a signed written agreement between you and Nokia.
40 ****************************************************************************/
46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_Literal_H
53 #define Patternist_Literal_H
55 #include <private/qemptycontainer_p.h>
64 * @short Houses an AtomicValue, making it available as an Expression.
66 * This is not only literals that can be created via the XQuery syntax(strings and numbers), but
67 * all other atomic values, such as <tt>xs:date</tt> or <tt>xs:time</tt>.
69 * @see <a href="http://www.w3.org/TR/xquery/#id-literals">XQuery 1.0: An XML Query Language,
71 * @author Frans Englich <frans.englich@nokia.com>
72 * @ingroup Patternist_expressions
74 class Literal : public EmptyContainer
78 * Creates a Literal that represents @p item.
80 * @param item must be non-null and cannot be a QXmlNodeModelIndex.
82 Literal(const Item &item);
84 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
85 virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
86 void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;
88 virtual SequenceType::Ptr staticType() const;
89 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
90 virtual ID id() const;
91 virtual QString description() const;
94 * @returns Expression::DisableElimination and Expression::IsEvaluated
96 virtual Properties properties() const;
99 * Declaring the return value of this function a const reference, leads
100 * to crashes in patternistview, for a to me unknown reason.
102 inline Item item() const
112 * @short Creates a Literal that wraps @p item, and returns it.
114 * This simplifies code. Instead of writing:
117 * Expression::Ptr(new Literal(item));
126 * This function is not declared static, because it breaks the build on
127 * at least aix-xlc-64.
131 inline Expression::Ptr wrapLiteral(const Item &item,
132 const StaticContext::Ptr &context,
133 const SourceLocationReflection *const r)
137 const Expression::Ptr retval(new Literal(item));
138 context->addLocation(retval.data(), context->locationFor(r));