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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 "qcommonsequencetypes_p.h"
#include "qgenericsequencetype_p.h"
#include "qoptimizationpasses_p.h"
#include "qifthenclause_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
IfThenClause::IfThenClause(const Expression::Ptr &test,
const Expression::Ptr &then,
const Expression::Ptr &el) : TripleContainer(test, then, el)
{
}
Item::Iterator::Ptr IfThenClause::evaluateSequence(const DynamicContext::Ptr &context) const
{
return m_operand1->evaluateEBV(context)
? m_operand2->evaluateSequence(context)
: m_operand3->evaluateSequence(context);
}
Item IfThenClause::evaluateSingleton(const DynamicContext::Ptr &context) const
{
return m_operand1->evaluateEBV(context)
? m_operand2->evaluateSingleton(context)
: m_operand3->evaluateSingleton(context);
}
bool IfThenClause::evaluateEBV(const DynamicContext::Ptr &context) const
{
return m_operand1->evaluateEBV(context)
? m_operand2->evaluateEBV(context)
: m_operand3->evaluateEBV(context);
}
void IfThenClause::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
if(m_operand1->evaluateEBV(context))
m_operand2->evaluateToSequenceReceiver(context);
else
m_operand3->evaluateToSequenceReceiver(context);
}
Expression::Ptr IfThenClause::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr me(TripleContainer::compress(context));
if(me != this)
return me;
/* All operands mustn't be evaluated in order for const folding to
* be possible. Let's see how far we get. */
if(m_operand1->isEvaluated())
{
if(m_operand1->evaluateEBV(context->dynamicContext()))
return m_operand2;
else
return m_operand3;
}
else
return me;
}
QList<QExplicitlySharedDataPointer<OptimizationPass> > IfThenClause::optimizationPasses() const
{
return OptimizationPasses::ifThenPasses;
}
SequenceType::List IfThenClause::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::EBV);
result.append(CommonSequenceTypes::ZeroOrMoreItems);
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
SequenceType::Ptr IfThenClause::staticType() const
{
const SequenceType::Ptr t1(m_operand2->staticType());
const SequenceType::Ptr t2(m_operand3->staticType());
return makeGenericSequenceType(t1->itemType() | t2->itemType(),
t1->cardinality() | t2->cardinality());
}
ExpressionVisitorResult::Ptr IfThenClause::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::ID IfThenClause::id() const
{
return IDIfThenClause;
}
/*
Expression::Properties IfThenClause::properties() const
{
return m_operand1->properties()
| m_operand2->properties()
| m_operand3->properties()
& ( Expression::RequiresFocus
| Expression::IsEvaluated
| Expression::DisableElimination);
}
*/
QT_END_NAMESPACE
|
