LocaleHelper.h

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/*
 * LocaleHelper.h - compatibility functions for handling decimal separators
 * Providing helper functions which handle both periods and commas
 * for decimal separators to load old projects correctly
 *
 * Copyright (c) 2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
 * Copyright (c) 2018 Hyunjin Song <tteu.ingog/at/gmail.com>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
// NOTE: The LMMS/zynaddsubfx repo contains a copy of this header.
//       If you modify this file, consider modifying it there as well.
 
#ifndef LMMS_LOCALEHELPER_H
#define LMMS_LOCALEHELPER_H
 
#include <QLocale>
 
#include <limits>
#include <cmath>
 
namespace lmms::LocaleHelper
{
 
inline double toDouble(const QString& str, bool* ok = nullptr)
{
    bool isOkay;
    QLocale c(QLocale::C);
    c.setNumberOptions(QLocale::RejectGroupSeparator);
    double value = c.toDouble(str, &isOkay);
    if (!isOkay)
    {
        QLocale german(QLocale::German);
        german.setNumberOptions(QLocale::RejectGroupSeparator);
        value = german.toDouble(str, &isOkay);
    }
    if (ok != nullptr) { *ok = isOkay; }
    return value;
}
 
inline float toFloat(const QString& str, bool* ok = nullptr)
{
    double d = toDouble(str, ok);
    if (!std::isinf(d) && std::fabs(d) > std::numeric_limits<float>::max())
    {
        if (ok != nullptr) { *ok = false; }
        return 0.0f;
    }
    return static_cast<float>(d);
}
 
 
} // namespace lmms::LocaleHelper
 
#endif // LMMS_LOCALEHELPER_H