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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 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 "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcurrentitemcontext_p.h"
#include "qstaticcurrentcontext_p.h"
#include "qcurrentitemstore_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
CurrentItemStore::CurrentItemStore(const Expression::Ptr &operand) : SingleContainer(operand)
{
}
DynamicContext::Ptr CurrentItemStore::createContext(const DynamicContext::Ptr &old) const
{
return DynamicContext::Ptr(new CurrentItemContext(old->contextItem(), old));
}
bool CurrentItemStore::evaluateEBV(const DynamicContext::Ptr &context) const
{
return m_operand->evaluateEBV(createContext(context));
}
Item::Iterator::Ptr CurrentItemStore::evaluateSequence(const DynamicContext::Ptr &context) const
{
return m_operand->evaluateSequence(createContext(context));
}
Item CurrentItemStore::evaluateSingleton(const DynamicContext::Ptr &context) const
{
return m_operand->evaluateSingleton(createContext(context));
}
SequenceType::Ptr CurrentItemStore::staticType() const
{
return m_operand->staticType();
}
SequenceType::List CurrentItemStore::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
StaticContext::Ptr CurrentItemStore::newStaticContext(const StaticContext::Ptr &context)
{
/* It might be we are generated despite there is no focus. In that case
* an error will reported in case current() is used, but in any case we cannot
* crash, so use item() in case we have no focus.
*
* Such a case is when we're inside a named template, and it's invoked
* without focus. */
const ItemType::Ptr t(context->contextItemType());
return StaticContext::Ptr(new StaticCurrentContext(t ? t : BuiltinTypes::item, context));
}
Expression::Ptr CurrentItemStore::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr me(SingleContainer::compress(newStaticContext(context)));
if(me != this)
return me;
else
{
/* If fn:current() isn't called, there's no point in us sticking
* around. */
if(m_operand->deepProperties().testFlag(RequiresCurrentItem))
return me;
else
return m_operand;
}
}
Expression::Ptr CurrentItemStore::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
return SingleContainer::typeCheck(newStaticContext(context), reqType);
}
ExpressionVisitorResult::Ptr CurrentItemStore::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
const SourceLocationReflection *CurrentItemStore::actualReflection() const
{
return m_operand->actualReflection();
}
Expression::Properties CurrentItemStore::properties() const
{
return m_operand->properties() & (RequiresFocus | IsEvaluated | DisableElimination);
}
QT_END_NAMESPACE
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