iso_locale.hpp

// Copyright (C) 2022 by Camden Mannett.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "arg_router/basic_types.hpp"
 
namespace arg_router::multi_lang
{
inline string iso_locale(std::string_view locale_name)
{
    // No need to worry about UTF-8 here as the codes are required to be ASCII
    // Start by stripping off the encoding
    auto result = string{};
    {
        const auto pos = locale_name.find('.');
        result = locale_name.substr(0, pos);
    }
 
    // Change hypens to underscores
    for (auto& c : result) {
        if (c == '-') {
            c = '_';
        }
    }
 
    return result;
}
}  // namespace arg_router::multi_lang