source: trunk/src/xmlpatterns/functions/qsequencefns.cpp@ 163

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qdistinctiterator_p.h"
#include "qebvextractor_p.h"
#include "qemptysequence_p.h"
#include "qgenericsequencetype_p.h"
#include "qindexofiterator_p.h"
#include "qinsertioniterator_p.h"
#include "qinteger_p.h"
#include "qremovaliterator_p.h"
#include "qsequencegeneratingfns_p.h"
#include "qsubsequenceiterator_p.h"

#include "qsequencefns_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

bool BooleanFN::evaluateEBV(const DynamicContext::Ptr &context) const
{
    return m_operands.first()->evaluateEBV(context);
}

Expression::Ptr BooleanFN::typeCheck(const StaticContext::Ptr &context,
                                     const SequenceType::Ptr &reqType)
{
    return EBVExtractor::typeCheck<FunctionCall>(context, reqType, this);
}

Item::Iterator::Ptr IndexOfFN::evaluateSequence(const DynamicContext::Ptr &context) const
{
    return Item::Iterator::Ptr(new IndexOfIterator(m_operands.first()->evaluateSequence(context),
                                                   m_operands.at(1)->evaluateSingleton(context),
                                                   comparator(), context,
                                                   ConstPtr(this)));
}

Expression::Ptr IndexOfFN::typeCheck(const StaticContext::Ptr &context,
                                     const SequenceType::Ptr &reqType)
{
    const Expression::Ptr me(FunctionCall::typeCheck(context, reqType));
    const ItemType::Ptr t1(m_operands.first()->staticType()->itemType());
    const ItemType::Ptr t2(m_operands.at(1)->staticType()->itemType());

    if(*CommonSequenceTypes::Empty == *t1 ||
       *CommonSequenceTypes::Empty == *t2)
    {
        return EmptySequence::create(this, context);
    }
    else
    {
        prepareComparison(fetchComparator(t1, t2, context));
        return me;
    }
}

Item::Iterator::Ptr DistinctValuesFN::evaluateSequence(const DynamicContext::Ptr &context) const
{
    return Item::Iterator::Ptr(new DistinctIterator(m_operands.first()->evaluateSequence(context),
                                                    comparator(),
                                                    ConstPtr(this),
                                                    context));
}

Expression::Ptr DistinctValuesFN::typeCheck(const StaticContext::Ptr &context,
                                            const SequenceType::Ptr &reqType)
{
    const Expression::Ptr me(FunctionCall::typeCheck(context, reqType));
    const ItemType::Ptr t1(m_operands.first()->staticType()->itemType());

    if(*CommonSequenceTypes::Empty == *t1)
        return EmptySequence::create(this, context);
    else if(!m_operands.first()->staticType()->cardinality().allowsMany())
        return m_operands.first();
    else if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t1))
        return me;
    else
    {
        prepareComparison(fetchComparator(t1, t1, context));
        return me;
    }
}

SequenceType::Ptr DistinctValuesFN::staticType() const
{
    const SequenceType::Ptr t(m_operands.first()->staticType());
    return makeGenericSequenceType(t->itemType(),
                                   t->cardinality().allowsMany() ? Cardinality::oneOrMore()
                                                                 : Cardinality::exactlyOne());
}