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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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 appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qgenericpredicate_p.h"
#include "qgenericsequencetype_p.h"
#include "qinsertioniterator_p.h"
#include "qpatternistlocale_p.h"
#include "qcardinalityverifier_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
QString CardinalityVerifier::wrongCardinality(const Cardinality &req,
const Cardinality &got)
{
return QtXmlPatterns::tr("Required cardinality is %1; got cardinality %2.")
.arg(formatType(req), formatType(got));
}
Expression::Ptr CardinalityVerifier::verifyCardinality(const Expression::Ptr &operand,
const Cardinality &requiredCard,
const StaticContext::Ptr &context,
const ReportContext::ErrorCode code)
{
const Cardinality opCard(operand->staticType()->cardinality());
if(requiredCard.isMatch(opCard))
return operand;
else if(requiredCard.canMatch(opCard))
return Expression::Ptr(new CardinalityVerifier(operand, requiredCard, code));
else if(context->compatModeEnabled() &&
!opCard.isEmpty())
{
return GenericPredicate::createFirstItem(operand);
}
else
{
/* Sequences within this cardinality can never match. */
context->error(wrongCardinality(requiredCard, opCard), code, operand.data());
return operand;
}
}
CardinalityVerifier::CardinalityVerifier(const Expression::Ptr &operand,
const Cardinality &card,
const ReportContext::ErrorCode code)
: SingleContainer(operand),
m_reqCard(card),
m_allowsMany(operand->staticType()->cardinality().allowsMany()),
m_errorCode(code)
{
Q_ASSERT_X(m_reqCard != Cardinality::zeroOrMore(), Q_FUNC_INFO,
"It makes no sense to use CardinalityVerifier for cardinality zero-or-more.");
}
Item::Iterator::Ptr CardinalityVerifier::evaluateSequence(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
const Item next(it->next());
if(next)
{
const Item next2(it->next());
if(next2)
{
if(m_reqCard.allowsMany())
{
Item::List start;
start.append(next);
start.append(next2);
return Item::Iterator::Ptr(new InsertionIterator(it, 1, makeListIterator(start)));
}
else
{
context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()), m_errorCode, this);
return CommonValues::emptyIterator;
}
}
else
{
/* We might be instantiated for the empty sequence. */
if(m_reqCard.isEmpty())
{
context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()), m_errorCode, this);
return CommonValues::emptyIterator;
}
else
return makeSingletonIterator(next);
}
}
else
{
if(m_reqCard.allowsEmpty())
return CommonValues::emptyIterator;
else
{
context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()), m_errorCode, this);
return CommonValues::emptyIterator;
}
}
}
Item CardinalityVerifier::evaluateSingleton(const DynamicContext::Ptr &context) const
{
if(m_allowsMany)
{
const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
const Item item(it->next());
if(item)
{
if(it->next())
{
context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()),
m_errorCode, this);
return Item();
}
else
return item;
}
else if(m_reqCard.allowsEmpty())
return Item();
else
{
context->error(wrongCardinality(m_reqCard), m_errorCode, this);
return Item();
}
}
else
{
const Item item(m_operand->evaluateSingleton(context));
if(item)
return item;
else if(m_reqCard.allowsEmpty())
return Item();
else
{
context->error(wrongCardinality(m_reqCard), m_errorCode, this);
return Item();
}
}
}
const SourceLocationReflection *CardinalityVerifier::actualReflection() const
{
return m_operand->actualReflection();
}
Expression::Ptr CardinalityVerifier::compress(const StaticContext::Ptr &context)
{
if(m_reqCard.isMatch(m_operand->staticType()->cardinality()))
return m_operand->compress(context);
else
return SingleContainer::compress(context);
}
SequenceType::List CardinalityVerifier::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
SequenceType::Ptr CardinalityVerifier::staticType() const
{
return makeGenericSequenceType(m_operand->staticType()->itemType(), m_reqCard);
}
ExpressionVisitorResult::Ptr CardinalityVerifier::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::ID CardinalityVerifier::id() const
{
return IDCardinalityVerifier;
}
QT_END_NAMESPACE
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