/****************************************************************************
**
** 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://www.qtsoftware.com/contact.
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****************************************************************************/

#include "qboolean_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qatomicstring_p.h"

#include "qsubstringfns_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

Item ContainsFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operands.first()->evaluateSingleton(context));
    QString str1;

    if(op1)
        str1 = op1.stringValue();

    const Item op2(m_operands.at(1)->evaluateSingleton(context));
    QString str2;

    if(op2)
        str2 = op2.stringValue();

    if(str2.isEmpty())
        return CommonValues::BooleanTrue;

    if(str1.isEmpty())
        return CommonValues::BooleanFalse;

    return Boolean::fromValue(str1.contains(str2, caseSensitivity()));
}

Item StartsWithFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operands.first()->evaluateSingleton(context));
    QString str1;

    if(op1)
        str1 = op1.stringValue();

    const Item op2(m_operands.at(1)->evaluateSingleton(context));
    QString str2;

    if(op2)
        str2 = op2.stringValue();

    if(str2.isEmpty())
        return CommonValues::BooleanTrue;

    if(str1.isEmpty())
        return CommonValues::BooleanFalse;

    return Boolean::fromValue(str1.startsWith(str2, caseSensitivity()));
}

Item EndsWithFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operands.first()->evaluateSingleton(context));
    QString str1;

    if(op1)
        str1 = op1.stringValue();

    const Item op2(m_operands.at(1)->evaluateSingleton(context));
    QString str2;

    if(op2)
        str2 = op2.stringValue();

    if(str2.isEmpty())
        return CommonValues::BooleanTrue;

    if(str1.isEmpty())
        return CommonValues::BooleanFalse;

    return Boolean::fromValue(str1.endsWith(str2, caseSensitivity()));
}

Item SubstringBeforeFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operands.first()->evaluateSingleton(context));
    QString str1;

    if(op1)
        str1 = op1.stringValue();

    const Item op2(m_operands.at(1)->evaluateSingleton(context));
    QString str2;

    if(op2)
        str2 = op2.stringValue();

    const int pos = str1.indexOf(str2);
    if(pos == -1)
        return CommonValues::EmptyString;

    return AtomicString::fromValue(QString(str1.left(pos)));
}

Item SubstringAfterFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operands.first()->evaluateSingleton(context));
    QString str1;

    if(op1)
        str1 = op1.stringValue();

    const Item op2(m_operands.at(1)->evaluateSingleton(context));
    QString str2;

    if(op2)
        str2 = op2.stringValue();

    if(str2.isEmpty())
    {
        if(op1)
            return op1;
        else
            return CommonValues::EmptyString;
    }

    const int pos = str1.indexOf(str2);

    if(pos == -1)
        return CommonValues::EmptyString;

    return AtomicString::fromValue(QString(str1.right(str1.length() - (pos + str2.length()))));
}

QT_END_NAMESPACE