nested_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/container/nested_map.hpp>
#include <cbeam/convert/map.hpp>    // for cbeam::convert::is_nested_map
#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::string, std::operator<<
#include <type_traits> // for std::decay_t, std::enable_if
 
namespace cbeam::convert
{
    template <typename Key, typename Value>
    inline std::string to_string(const container::nested_map<Key, Value>& map, const int indentation);
 
    template <typename Key, typename Value>
    inline std::string to_string(container::nested_map<Key, Value>& map, const int indentation);

    template <typename Key, typename Value>
    inline std::string to_string(const std::map<Key, container::nested_map<Key, Value>>& nested_maps, const int indentation)
    {
        std::ostringstream os;
        for (const auto& it : nested_maps)
        {
            os << indent(indentation) << to_string(it.first) << std::endl
               << to_string<Key, Value>(it.second, indentation + 1);
        }
        return os.str();
    }

    template <typename Key, typename Value>
    inline std::string to_string(const std::map<Key, container::nested_map<Key, Value>>& nested_maps)
    {
        return to_string<Key, Value>(nested_maps, 0);
    }

    template <typename Key, typename Value>
    inline std::string to_string(const container::nested_map<Key, Value>& map, const int indentation)
    {
        return to_string(map.data, indentation + 1)
             + to_string(map.sub_tables, indentation + 1);
    }

    template <typename Key, typename Value>
    inline std::string to_string(const container::nested_map<Key, Value>& map)
    {
        return to_string(map, -1);
    }

    template <typename T>
    inline typename std::enable_if<is_nested_map<T>::value, std::string>::type to_string(const T& table)
    {
        using DataTableType = typename std::decay_t<decltype(table)>;
        using KeyType       = typename DataTableType::key_type;
        using ValueType     = typename DataTableType::mapped_type;
 
        return cbeam::convert::to_string<KeyType, ValueType>(table);
    }
}