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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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)
{
}
/*! \internal */
ValueComparison::~ValueComparison()
{
}
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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