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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 "qitem_p.h"
#include "qboolean_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qoptimizationpasses_p.h"
#include "qvaluecomparison_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
ValueComparison::ValueComparison(const Expression::Ptr &op1,
const AtomicComparator::Operator op,
const Expression::Ptr &op2) : PairContainer(op1, op2),
m_operator(op)
{
}
Item ValueComparison::evaluateSingleton(const DynamicContext::Ptr &context) const
{
const Item it1(m_operand1->evaluateSingleton(context));
if(!it1)
return Item();
const Item it2(m_operand2->evaluateSingleton(context));
if(!it2)
return Item();
return Boolean::fromValue(flexibleCompare(it1, it2, context));
}
Expression::Ptr ValueComparison::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
const ItemType::Ptr t1(m_operand1->staticType()->itemType());
const ItemType::Ptr t2(m_operand2->staticType()->itemType());
Q_ASSERT(t1);
Q_ASSERT(t2);
if(*CommonSequenceTypes::Empty == *t1 ||
*CommonSequenceTypes::Empty == *t2)
{
return EmptySequence::create(this, context);
}
else
{
prepareComparison(fetchComparator(t1, t2, context));
return me;
}
}
Expression::Ptr ValueComparison::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr me(PairContainer::compress(context));
if(me != this)
return me;
if(isCaseInsensitiveCompare(m_operand1, m_operand2))
useCaseInsensitiveComparator();
return me;
}
bool ValueComparison::isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2)
{
Q_ASSERT(op1);
Q_ASSERT(op2);
const ID iD = op1->id();
if((iD == IDLowerCaseFN || iD == IDUpperCaseFN) && iD == op2->id())
{
/* Both are either fn:lower-case() or fn:upper-case(). */
/* Replace the calls to the functions with its operands. */
op1 = op1->operands().first();
op2 = op2->operands().first();
return true;
}
else
return false;
}
OptimizationPass::List ValueComparison::optimizationPasses() const
{
return OptimizationPasses::comparisonPasses;
}
SequenceType::List ValueComparison::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
return result;
}
SequenceType::Ptr ValueComparison::staticType() const
{
if(m_operand1->staticType()->cardinality().allowsEmpty() ||
m_operand2->staticType()->cardinality().allowsEmpty())
return CommonSequenceTypes::ZeroOrOneBoolean;
else
return CommonSequenceTypes::ExactlyOneBoolean;
}
ExpressionVisitorResult::Ptr ValueComparison::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::ID ValueComparison::id() const
{
return IDValueComparison;
}
QT_END_NAMESPACE
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