1 /****************************************************************************
2 **
3 ** Copyright (C) 2016 The Qt Company Ltd.
4 ** Contact: https://www.qt.io/licensing/
5 **
6 ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and The Qt Company. For licensing terms
14 ** and conditions see https://www.qt.io/terms-conditions. For further
15 ** information use the contact form at https://www.qt.io/contact-us.
16 **
17 ** GNU Lesser General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU Lesser
19 ** General Public License version 3 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 3 requirements
23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24 **
25 ** GNU General Public License Usage
26 ** Alternatively, this file may be used under the terms of the GNU
27 ** General Public License version 2.0 or (at your option) the GNU General
28 ** Public license version 3 or any later version approved by the KDE Free
29 ** Qt Foundation. The licenses are as published by the Free Software
30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31 ** included in the packaging of this file. Please review the following
32 ** information to ensure the GNU General Public License requirements will
33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34 ** https://www.gnu.org/licenses/gpl-3.0.html.
35 **
36 ** $QT_END_LICENSE$
37 **
38 ****************************************************************************/
39
40 #include "qarithmeticexpression_p.h"
41 #include "qcommonvalues_p.h"
42 #include "qliteral_p.h"
43 #include "qschemanumeric_p.h"
44
45 #include "qunaryexpression_p.h"
46
47 QT_BEGIN_NAMESPACE
48
49 using namespace QPatternist;
50
UnaryExpression(const AtomicMathematician::Operator op,const Expression::Ptr & operand,const StaticContext::Ptr & context)51 UnaryExpression::UnaryExpression(const AtomicMathematician::Operator op,
52 const Expression::Ptr &operand,
53 const StaticContext::Ptr &context) : ArithmeticExpression(wrapLiteral(CommonValues::IntegerZero, context, operand.data()),
54 op,
55 operand)
56 {
57 Q_ASSERT(op == AtomicMathematician::Substract ||
58 op == AtomicMathematician::Add);
59 Q_ASSERT(context);
60 }
61
evaluateSingleton(const DynamicContext::Ptr & context) const62 Item UnaryExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
63 {
64 if(operatorID() == AtomicMathematician::Substract)
65 {
66 const Item item(m_operand2->evaluateSingleton(context));
67
68 if (item)
69 // If the item is an untypedAtomic (or atomicString), the cast to Numeric will
70 // return a garbage object and will most likely cause a crash.
71 // There is simply no way to static cast from an instance of AtomicString to a Number.
72 return item.as<Numeric>()->toNegated();
73 else
74 return Item();
75 }
76 else
77 return m_operand2->evaluateSingleton(context);
78 }
79
80 QT_END_NAMESPACE
81