/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtQml module of the Qt Toolkit.
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** 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
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****************************************************************************/

#ifndef QV4ISEL_UTIL_P_H
#define QV4ISEL_UTIL_P_H

#include "private/qv4value_def_p.h"
#include "qv4jsir_p.h"

QT_BEGIN_NAMESPACE

namespace QQmlJS {

inline bool canConvertToSignedInteger(double value)
{
    int ival = (int) value;
    // +0 != -0, so we need to convert to double when negating 0
    return ival == value && !(value == 0 && isNegative(value));
}

inline bool canConvertToUnsignedInteger(double value)
{
    unsigned uval = (unsigned) value;
    // +0 != -0, so we need to convert to double when negating 0
    return uval == value && !(value == 0 && isNegative(value));
}

inline QV4::Primitive convertToValue(V4IR::Const *c)
{
    switch (c->type) {
    case V4IR::MissingType:
        return QV4::Primitive::emptyValue();
    case V4IR::NullType:
        return QV4::Primitive::nullValue();
    case V4IR::UndefinedType:
        return QV4::Primitive::undefinedValue();
    case V4IR::BoolType:
        return QV4::Primitive::fromBoolean(c->value != 0);
    case V4IR::SInt32Type:
        return QV4::Primitive::fromInt32(int(c->value));
    case V4IR::UInt32Type:
        return QV4::Primitive::fromUInt32(unsigned(c->value));
    case V4IR::DoubleType:
        return QV4::Primitive::fromDouble(c->value);
    case V4IR::NumberType: {
        int ival = (int)c->value;
        if (canConvertToSignedInteger(c->value)) {
            return QV4::Primitive::fromInt32(ival);
        } else {
            return QV4::Primitive::fromDouble(c->value);
        }
    }
    default:
        Q_UNREACHABLE();
    }
    // unreachable, but the function must return something
    return QV4::Primitive::undefinedValue();
}

} // namespace QQmlJS

QT_END_NAMESPACE

#endif // QV4ISEL_UTIL_P_H