Locale.h

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#ifndef OSMSCOUT_LOCALE_H
#define OSMSCOUT_LOCALE_H
 
/*
  This source is part of the libosmscout library
  Copyright (C) 2019 Lukáš Karas
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <osmscout/lib/CoreImportExport.h>
#include <osmscout/system/Compiler.h>
 
#include <osmscout/util/Distance.h>
#include <osmscout/log/Logger.h>
 
#include <string>
 
namespace osmscout {
 
  class OSMSCOUT_API Locale CLASS_FINAL
  {
  private:
    DistanceUnitSystem distanceUnits{DistanceUnitSystem::Metrics};
    std::string decimalSeparator{"."}; 
    std::string thousandsSeparator; 
 
    // use tiny, unbreakable space between value and unit.
    // U+202F unicode is encoded as 0xE280AF in utf-8
    // because unicode support in C++ is poor and platform dependent,
    // we will use utf-8 bytes directly
    std::string unitsSeparator{"\xE2\x80\xAF"}; 
 
  public:
    Locale() = default;
 
    Locale(const DistanceUnitSystem &distanceUnits,
           const std::string &decimalSeparator,
           const std::string &thousandsSeparator);
 
    Locale(const Locale&) = default;
    Locale(Locale&&) = default;
    ~Locale() = default;
    Locale &operator=(const Locale &) = default;
    Locale &operator=(Locale &&) = default;
 
    DistanceUnitSystem GetDistanceUnits() const
    {
      return distanceUnits;
    }
 
    void SetDistanceUnits(const DistanceUnitSystem &units)
    {
      this->distanceUnits = units;
    }
 
    std::string GetDecimalSeparator() const
    {
      return decimalSeparator;
    }
 
    void SetDecimalSeparator(const std::string &separator)
    {
      this->decimalSeparator = separator;
    }
 
    std::string GetThousandsSeparator() const
    {
      return thousandsSeparator;
    }
 
    void SetThousandsSeparator(const std::string &separator)
    {
      this->thousandsSeparator = separator;
    }
 
    std::string GetUnitsSeparator() const
    {
      return unitsSeparator;
    }
 
    void SetUnitsSeparator(const std::string &separator)
    {
      this->unitsSeparator = separator;
    }
 
  public:

    static Locale FromStdLocale(std::locale locale);

    static Locale ByEnvironment()
    {
      return FromStdLocale(std::locale(""));
    }

    static Locale ByEnvironmentSafe()
    {
      try {
        return ByEnvironment();
      } catch (const std::runtime_error &e) {
        log.Warn() << "Failed to get environment locale: " << e.what();
        return Locale();
      }
    }
  };
}
 
#endif // OSMSCOUT_LOCALE_H