1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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10 ** GNU Lesser General Public License Usage
11 ** This file may be used under the terms of the GNU Lesser General Public
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14 ** file. Please review the following information to ensure the GNU Lesser
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20 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
22 ** GNU General Public License Usage
23 ** Alternatively, this file may be used under the terms of the GNU General
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40 ****************************************************************************/
42 #include "qboolean_p.h"
43 #include "qcommonsequencetypes_p.h"
44 #include "qcommonvalues_p.h"
45 #include "qliteral_p.h"
47 #include "qinstanceof_p.h"
51 using namespace QPatternist;
53 InstanceOf::InstanceOf(const Expression::Ptr &operand,
54 const SequenceType::Ptr &tType) : SingleContainer(operand)
57 Q_ASSERT(m_targetType);
60 bool InstanceOf::evaluateEBV(const DynamicContext::Ptr &context) const
62 const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
63 Item item(it->next());
64 unsigned int count = 1;
67 return m_targetType->cardinality().allowsEmpty();
71 if(!m_targetType->itemType()->itemMatches(item))
74 if(count == 2 && !m_targetType->cardinality().allowsMany())
84 Expression::Ptr InstanceOf::compress(const StaticContext::Ptr &context)
86 const Expression::Ptr me(SingleContainer::compress(context));
88 if(me != this || m_operand->has(DisableTypingDeduction))
91 const SequenceType::Ptr opType(m_operand->staticType());
92 const ItemType::Ptr targetType(m_targetType->itemType());
93 const ItemType::Ptr operandType(opType->itemType());
95 if(m_targetType->cardinality().isMatch(opType->cardinality()))
97 if(*operandType == *CommonSequenceTypes::Empty || targetType->xdtTypeMatches(operandType))
98 return wrapLiteral(CommonValues::BooleanTrue, context, this);
99 else if(!operandType->xdtTypeMatches(targetType))
100 return wrapLiteral(CommonValues::BooleanFalse, context, this);
102 /* Optimization: rule out the case where instance of will always fail. */
107 SequenceType::Ptr InstanceOf::targetType() const
112 SequenceType::Ptr InstanceOf::staticType() const
114 return CommonSequenceTypes::ExactlyOneBoolean;
117 SequenceType::List InstanceOf::expectedOperandTypes() const
119 SequenceType::List result;
120 result.append(CommonSequenceTypes::ZeroOrMoreItems);
124 ExpressionVisitorResult::Ptr InstanceOf::accept(const ExpressionVisitor::Ptr &visitor) const
126 return visitor->visit(this);