| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
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| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
| ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-2.0.html and |
| ** https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qboolean_p.h" |
| #include "qcommonsequencetypes_p.h" |
| #include "qcommonvalues_p.h" |
| #include "qliteral_p.h" |
| |
| #include "qinstanceof_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| using namespace QPatternist; |
| |
| InstanceOf::InstanceOf(const Expression::Ptr &operand, |
| const SequenceType::Ptr &tType) : SingleContainer(operand) |
| , m_targetType(tType) |
| { |
| Q_ASSERT(m_targetType); |
| } |
| |
| bool InstanceOf::evaluateEBV(const DynamicContext::Ptr &context) const |
| { |
| const Item::Iterator::Ptr it(m_operand->evaluateSequence(context)); |
| Item item(it->next()); |
| unsigned int count = 1; |
| |
| if(!item) |
| return m_targetType->cardinality().allowsEmpty(); |
| |
| do |
| { |
| if(!m_targetType->itemType()->itemMatches(item)) |
| return false; |
| |
| if(count == 2 && !m_targetType->cardinality().allowsMany()) |
| return false; |
| |
| item = it->next(); |
| ++count; |
| } while(item); |
| |
| return true; |
| } |
| |
| Expression::Ptr InstanceOf::compress(const StaticContext::Ptr &context) |
| { |
| const Expression::Ptr me(SingleContainer::compress(context)); |
| |
| if(me != this || m_operand->has(DisableTypingDeduction)) |
| return me; |
| |
| const SequenceType::Ptr opType(m_operand->staticType()); |
| const ItemType::Ptr targetType(m_targetType->itemType()); |
| const ItemType::Ptr operandType(opType->itemType()); |
| |
| if(m_targetType->cardinality().isMatch(opType->cardinality())) |
| { |
| if(*operandType == *CommonSequenceTypes::Empty || targetType->xdtTypeMatches(operandType)) |
| return wrapLiteral(CommonValues::BooleanTrue, context, this); |
| else if(!operandType->xdtTypeMatches(targetType)) |
| return wrapLiteral(CommonValues::BooleanFalse, context, this); |
| } |
| /* Optimization: rule out the case where instance of will always fail. */ |
| |
| return me; |
| } |
| |
| SequenceType::Ptr InstanceOf::targetType() const |
| { |
| return m_targetType; |
| } |
| |
| SequenceType::Ptr InstanceOf::staticType() const |
| { |
| return CommonSequenceTypes::ExactlyOneBoolean; |
| } |
| |
| SequenceType::List InstanceOf::expectedOperandTypes() const |
| { |
| SequenceType::List result; |
| result.append(CommonSequenceTypes::ZeroOrMoreItems); |
| return result; |
| } |
| |
| ExpressionVisitorResult::Ptr InstanceOf::accept(const ExpressionVisitor::Ptr &visitor) const |
| { |
| return visitor->visit(this); |
| } |
| |
| QT_END_NAMESPACE |