diagnostics()

template<typename BasicJsonType >

static std::string nlohmann::detail::exception::diagnostics ( const BasicJsonType &  leaf_element )

inlinestaticprotected

Definition at line 2671 of file json.hpp.

    {
#if JSON_DIAGNOSTICS
        std::vector<std::string> tokens;
 
        for (const auto *current = &leaf_element; current->m_parent != nullptr; current = current->m_parent)
        {
            switch (current->m_parent->type())
            {
                case value_t::array:
                {
                    for (std::size_t i = 0; i < current->m_parent->m_value.array->size(); ++i)
                    {
                        if (&current->m_parent->m_value.array->operator[](i) == current)
                        {
                            tokens.emplace_back(std::to_string(i));
                            break;
                        }
                    }
 
                    break;
                }
 
                case value_t::object:
                {
                    for (const auto &element : *current->m_parent->m_value.object)
                    {
                        if (&element.second == current)
                        {
                            tokens.emplace_back(element.first.c_str());
                            break;
                        }
                    }
 
                    break;
                }
 
                case value_t::null: // LCOV_EXCL_LINE
                case value_t::string: // LCOV_EXCL_LINE
                case value_t::boolean: // LCOV_EXCL_LINE
                case value_t::number_integer: // LCOV_EXCL_LINE
                case value_t::number_unsigned: // LCOV_EXCL_LINE
                case value_t::number_float: // LCOV_EXCL_LINE
                case value_t::binary: // LCOV_EXCL_LINE
                case value_t::discarded: // LCOV_EXCL_LINE
                default:   // LCOV_EXCL_LINE
                    break; // LCOV_EXCL_LINE
            }
        }
 
        if (tokens.empty())
        {
            return "";
        }
 
        return "(" + std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},
                                     [](const std::string & a, const std::string & b)
        {
            return a + "/" + detail::escape(b);
        }) + ") ";
#else
        static_cast<void>(leaf_element);
        return "";
#endif
    }