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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qatomictype_p.h"
#include "qitem_p.h"
#include "qboolean_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qcastableas_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
CastableAs::CastableAs(const Expression::Ptr &operand,
const SequenceType::Ptr &tType) : SingleContainer(operand),
m_targetType(tType)
{
Q_ASSERT(tType);
Q_ASSERT(!tType->cardinality().allowsMany());
Q_ASSERT(tType->itemType()->isAtomicType());
}
bool CastableAs::evaluateEBV(const DynamicContext::Ptr &context) const
{
Item item;
if(m_operand->staticType()->cardinality().allowsMany())
{
const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
item = it->next();
if(it->next())
return false;
}
else
item = m_operand->evaluateSingleton(context);
if(item)
return !cast(item, context).as<AtomicValue>()->hasError();
else
return m_targetType->cardinality().allowsEmpty();
}
Expression::Ptr CastableAs::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr me(SingleContainer::compress(context));
if(me != this) /* We already managed to const fold, how convenient. */
return me;
const AtomicType::Ptr t(m_targetType->itemType());
const SequenceType::Ptr opType(m_operand->staticType());
/* Casting to these always succeeds, assuming the cardinality also matches,
* although the cardinality can fail. */
if(( *t == *BuiltinTypes::xsString
|| *t == *BuiltinTypes::xsUntypedAtomic
|| *t == *opType->itemType())
&&(m_targetType->cardinality().isMatch(opType->cardinality())))
{
return wrapLiteral(CommonValues::BooleanTrue, context, this);
}
else
return me;
}
Expression::Ptr CastableAs::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
checkTargetType(context);
const Expression::Ptr me(SingleContainer::typeCheck(context, reqType));
return me;
if(BuiltinTypes::xsQName->xdtTypeMatches(m_targetType->itemType()))
{
const SequenceType::Ptr seqt(m_operand->staticType());
/* We can cast a string literal, an xs:QName value, and an
* empty sequence(if empty is allowed), to xs:QName. */
if(m_operand->is(IDStringValue) ||
BuiltinTypes::xsQName->xdtTypeMatches(seqt->itemType()) ||
(*seqt->itemType() == *CommonSequenceTypes::Empty && m_targetType->cardinality().allowsEmpty()))
{
return wrapLiteral(CommonValues::BooleanTrue, context, this)->typeCheck(context, reqType);
}
else
return wrapLiteral(CommonValues::BooleanFalse, context, this)->typeCheck(context, reqType);
}
else
{
/* Let the CastingPlatform look up its AtomicCaster. */
prepareCasting(context, m_operand->staticType()->itemType());
return me;
}
}
SequenceType::List CastableAs::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes);
return result;
}
SequenceType::Ptr CastableAs::staticType() const
{
return CommonSequenceTypes::ExactlyOneBoolean;
}
ExpressionVisitorResult::Ptr CastableAs::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QT_END_NAMESPACE
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