map.hpp

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/*
Copyright (c) 2025 acrion innovations GmbH
Authors: Stefan Zipproth, s.zipproth@acrion.ch
 
This file is part of Cbeam, see https://github.com/acrion/cbeam and https://cbeam.org
 
Cbeam is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://acrion.ch/sales. For AGPL licensing, see below.
 
AGPL licensing:
 
Cbeam is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
 
Cbeam 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 Affero General Public License for more details.
 
You should have received a copy of the GNU Affero General Public License
along with Cbeam. If not, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <cbeam/convert/string.hpp> // for cbeam::convert::indent
 
#include <ostream>     // for std::basic_ostream, std::endl, std::ostringstream
#include <string>      // for std::char_traits, std::operator<<, std::string
#include <type_traits> // for std::enable_if, std::false_type, std::true_type, std::void_t
 
namespace cbeam::convert
{
    template <typename T, typename = void>
    struct is_nested_map : std::false_type
    {
    };
 
    template <typename T>
    struct is_nested_map<T, std::void_t<typename T::nested_tables, typename T::table_of_values>> : std::true_type
    {
    };

    template <typename T, typename = void>
    struct has_key_and_mapped_type : std::false_type
    {
    };
 
    template <typename T>
    struct has_key_and_mapped_type<T, std::void_t<typename T::key_type, typename T::mapped_type>> : std::true_type
    {
    };

    template <typename T>
    inline typename std::enable_if<has_key_and_mapped_type<T>::value && !is_nested_map<T>::value, std::string>::type to_string(const T& table, const int indentation)
    {
        std::ostringstream os;
        for (const auto& it : table)
        {
            os << indent(indentation) << to_string(it.first)
               << indent(1) << to_string(it.second) << std::endl;
        }
        return os.str();
    }

    template <typename T>
    inline typename std::enable_if<has_key_and_mapped_type<T>::value && !is_nested_map<T>::value, std::string>::type to_string(const T& table)
    {
        return to_string<T>(table, 0);
    }
}