/****************************************************************************
**
** 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
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** 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.
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** $QT_END_LICENSE$
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****************************************************************************/

#include "qcommonsequencetypes_p.h"
#include "qpatternistlocale_p.h"
#include "qqnamevalue_p.h"
#include "qatomicstring_p.h"

#include "qerrorfn_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

Item ErrorFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    QString msg;

    switch(m_operands.count())
    {
        case 0: /* No args. */
        {
            context->error(QtXmlPatterns::tr("%1 was called.").arg(formatFunction(context->namePool(), signature())),
                            ReportContext::FOER0000, this);
            return Item();
        }
        case 3:
        /* Fallthrough, we don't use the 'error object' param. */
        case 2:
            msg = m_operands.at(1)->evaluateSingleton(context).stringValue();
        /* Fall through. */
        case 1:
        {
            const QNameValue::Ptr qName(m_operands.first()->evaluateSingleton(context).as<QNameValue>());

            if(qName)
                context->error(msg, qName->qName(), this);
            else
                context->error(msg, ReportContext::FOER0000, this);

            return Item();
        }
        default:
        {
            Q_ASSERT_X(false, Q_FUNC_INFO,
                       "Invalid number of arguments passed to fn:error.");
            return Item();
        }
    }
}

FunctionSignature::Ptr ErrorFN::signature() const
{
    const FunctionSignature::Ptr e(FunctionCall::signature());

    if(m_operands.count() != 1)
        return e;

    FunctionSignature::Ptr nev(FunctionSignature::Ptr(new FunctionSignature(e->name(),
                                                      e->minimumArguments(),
                                                      e->maximumArguments(),
                                                      e->returnType(),
                                                      e->properties())));
    const FunctionArgument::List args(e->arguments());
    FunctionArgument::List nargs;
    const QXmlName argName(StandardNamespaces::empty, StandardLocalNames::error);
    nargs.append(FunctionArgument::Ptr(new FunctionArgument(argName, CommonSequenceTypes::ExactlyOneQName)));
    nargs.append(args[1]);
    nargs.append(args[2]);
    nev->setArguments(nargs);

    return nev;
}

QT_END_NAMESPACE