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// Copyright (c) 2020 INRA Distributed under the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef ORG_VLEPROJECT_IRRITATOR_IO_2020
#define ORG_VLEPROJECT_IRRITATOR_IO_2020

#include <irritator/core.hpp>

#include <algorithm>
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#include <istream>
#include <ostream>
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#include <streambuf>
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#include <vector>
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namespace irt {

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static inline const char* dynamics_type_names[] = { "none",
                                                    "qss1_integrator",
                                                    "qss1_multiplier",
                                                    "qss1_cross",
                                                    "qss1_power",
                                                    "qss1_square",
                                                    "qss1_sum_2",
                                                    "qss1_sum_3",
                                                    "qss1_sum_4",
                                                    "qss1_wsum_2",
                                                    "qss1_wsum_3",
                                                    "qss1_wsum_4",
                                                    "qss2_integrator",
                                                    "qss2_multiplier",
                                                    "qss2_cross",
                                                    "qss2_power",
                                                    "qss2_square",
                                                    "qss2_sum_2",
                                                    "qss2_sum_3",
                                                    "qss2_sum_4",
                                                    "qss2_wsum_2",
                                                    "qss2_wsum_3",
                                                    "qss2_wsum_4",
                                                    "qss3_integrator",
                                                    "qss3_multiplier",
                                                    "qss3_cross",
                                                    "qss3_power",
                                                    "qss3_square",
                                                    "qss3_sum_2",
                                                    "qss3_sum_3",
                                                    "qss3_sum_4",
                                                    "qss3_wsum_2",
                                                    "qss3_wsum_3",
                                                    "qss3_wsum_4",
                                                    "integrator",
                                                    "quantifier",
                                                    "adder_2",
                                                    "adder_3",
                                                    "adder_4",
                                                    "mult_2",
                                                    "mult_3",
                                                    "mult_4",
                                                    "counter",
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                                                    "buffer",
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                                                    "generator",
                                                    "constant",
                                                    "cross",
                                                    "time_func",
                                                    "accumulator_2",
                                                    "flow" };

static_assert(std::size(dynamics_type_names) ==
              static_cast<sz>(dynamics_type_size()));

static inline const char* str_empty[] = { "" };
static inline const char* str_integrator[] = { "x-dot", "reset" };
static inline const char* str_adaptative_integrator[] = { "quanta",
                                                          "x-dot",
                                                          "reset" };
static inline const char* str_in_1[] = { "in" };
static inline const char* str_in_2[] = { "in-1", "in-2" };
static inline const char* str_in_3[] = { "in-1", "in-2", "in-3" };
static inline const char* str_in_4[] = { "in-1", "in-2", "in-3", "in-4" };
static inline const char* str_value_if_else[] = { "value",
                                                  "if",
                                                  "else",
                                                  "threshold" };
static inline const char* str_in_2_nb_2[] = { "in-1", "in-2", "nb-1", "nb-2" };

template<typename Dynamics>
static constexpr const char**
get_input_port_names() noexcept
{
    if constexpr (std::is_same_v<Dynamics, none>)
        return str_empty;

    if constexpr (std::is_same_v<Dynamics, qss1_integrator> ||
                  std::is_same_v<Dynamics, qss2_integrator> ||
                  std::is_same_v<Dynamics, qss3_integrator>)
        return str_integrator;

    if constexpr (std::is_same_v<Dynamics, qss1_multiplier> ||
                  std::is_same_v<Dynamics, qss1_sum_2> ||
                  std::is_same_v<Dynamics, qss1_wsum_2> ||
                  std::is_same_v<Dynamics, qss2_multiplier> ||
                  std::is_same_v<Dynamics, qss2_sum_2> ||
                  std::is_same_v<Dynamics, qss2_wsum_2> ||
                  std::is_same_v<Dynamics, qss3_multiplier> ||
                  std::is_same_v<Dynamics, qss3_sum_2> ||
                  std::is_same_v<Dynamics, qss3_wsum_2> ||
                  std::is_same_v<Dynamics, adder_2> ||
                  std::is_same_v<Dynamics, mult_2>)
        return str_in_2;

    if constexpr (std::is_same_v<Dynamics, qss1_sum_3> ||
                  std::is_same_v<Dynamics, qss1_wsum_3> ||
                  std::is_same_v<Dynamics, qss2_sum_3> ||
                  std::is_same_v<Dynamics, qss2_wsum_3> ||
                  std::is_same_v<Dynamics, qss3_sum_3> ||
                  std::is_same_v<Dynamics, qss3_wsum_3> ||
                  std::is_same_v<Dynamics, adder_3> ||
                  std::is_same_v<Dynamics, mult_3>)
        return str_in_3;

    if constexpr (std::is_same_v<Dynamics, qss1_sum_4> ||
                  std::is_same_v<Dynamics, qss1_wsum_4> ||
                  std::is_same_v<Dynamics, qss2_sum_4> ||
                  std::is_same_v<Dynamics, qss2_wsum_4> ||
                  std::is_same_v<Dynamics, qss3_sum_4> ||
                  std::is_same_v<Dynamics, qss3_wsum_4> ||
                  std::is_same_v<Dynamics, adder_4> ||
                  std::is_same_v<Dynamics, mult_4>)
        return str_in_4;

    if constexpr (std::is_same_v<Dynamics, integrator>)
        return str_adaptative_integrator;

    if constexpr (std::is_same_v<Dynamics, quantifier> ||
                  std::is_same_v<Dynamics, counter> ||
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                  std::is_same_v<Dynamics, buffer> ||
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                  std::is_same_v<Dynamics, qss1_power> ||
                  std::is_same_v<Dynamics, qss2_power> ||
                  std::is_same_v<Dynamics, qss3_power> ||
                  std::is_same_v<Dynamics, qss1_square> ||
                  std::is_same_v<Dynamics, qss2_square> ||
                  std::is_same_v<Dynamics, qss3_square>)
        return str_in_1;

    if constexpr (std::is_same_v<Dynamics, generator> ||
                  std::is_same_v<Dynamics, constant> ||
                  std::is_same_v<Dynamics, time_func> ||
                  std::is_same_v<Dynamics, flow>)
        return str_empty;

    if constexpr (std::is_same_v<Dynamics, qss1_cross> ||
                  std::is_same_v<Dynamics, qss2_cross> ||
                  std::is_same_v<Dynamics, qss3_cross> ||
                  std::is_same_v<Dynamics, cross>)
        return str_value_if_else;

    if constexpr (std::is_same_v<Dynamics, accumulator_2>)
        return str_in_2_nb_2;

    irt_unreachable();
}

static constexpr const char**
get_input_port_names(const dynamics_type type) noexcept
{
    switch (type) {
    case dynamics_type::none:
        return str_empty;

    case dynamics_type::qss1_integrator:
    case dynamics_type::qss2_integrator:
    case dynamics_type::qss3_integrator:
        return str_integrator;

    case dynamics_type::qss1_multiplier:
    case dynamics_type::qss1_sum_2:
    case dynamics_type::qss1_wsum_2:
    case dynamics_type::qss2_multiplier:
    case dynamics_type::qss2_sum_2:
    case dynamics_type::qss2_wsum_2:
    case dynamics_type::qss3_multiplier:
    case dynamics_type::qss3_sum_2:
    case dynamics_type::qss3_wsum_2:
    case dynamics_type::adder_2:
    case dynamics_type::mult_2:
        return str_in_2;

    case dynamics_type::qss1_sum_3:
    case dynamics_type::qss1_wsum_3:
    case dynamics_type::qss2_sum_3:
    case dynamics_type::qss2_wsum_3:
    case dynamics_type::qss3_sum_3:
    case dynamics_type::qss3_wsum_3:
    case dynamics_type::adder_3:
    case dynamics_type::mult_3:
        return str_in_3;

    case dynamics_type::qss1_sum_4:
    case dynamics_type::qss1_wsum_4:
    case dynamics_type::qss2_sum_4:
    case dynamics_type::qss2_wsum_4:
    case dynamics_type::qss3_sum_4:
    case dynamics_type::qss3_wsum_4:
    case dynamics_type::adder_4:
    case dynamics_type::mult_4:
        return str_in_4;

    case dynamics_type::integrator:
        return str_adaptative_integrator;

    case dynamics_type::quantifier:
    case dynamics_type::counter:
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    case dynamics_type::buffer:
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    case dynamics_type::qss1_power:
    case dynamics_type::qss2_power:
    case dynamics_type::qss3_power:
    case dynamics_type::qss1_square:
    case dynamics_type::qss2_square:
    case dynamics_type::qss3_square:
        return str_in_1;

    case dynamics_type::generator:
    case dynamics_type::constant:
    case dynamics_type::time_func:
    case dynamics_type::flow:
        return str_empty;

    case dynamics_type::qss1_cross:
    case dynamics_type::qss2_cross:
    case dynamics_type::qss3_cross:
    case dynamics_type::cross:
        return str_value_if_else;

    case dynamics_type::accumulator_2:
        return str_in_2_nb_2;
    }

    irt_unreachable();
}

static inline const char* str_out_1[] = { "out" };
static inline const char* str_out_cross[] = { "if-value",
                                              "else-value",
                                              "event" };

template<typename Dynamics>
static constexpr const char**
get_output_port_names() noexcept
{
    if constexpr (std::is_same_v<Dynamics, none>)
        return str_empty;

    if constexpr (std::is_same_v<Dynamics, qss1_integrator> ||
                  std::is_same_v<Dynamics, qss1_multiplier> ||
                  std::is_same_v<Dynamics, qss1_power> ||
                  std::is_same_v<Dynamics, qss1_square> ||
                  std::is_same_v<Dynamics, qss1_sum_2> ||
                  std::is_same_v<Dynamics, qss1_sum_3> ||
                  std::is_same_v<Dynamics, qss1_sum_4> ||
                  std::is_same_v<Dynamics, qss1_wsum_2> ||
                  std::is_same_v<Dynamics, qss1_wsum_3> ||
                  std::is_same_v<Dynamics, qss1_wsum_4> ||
                  std::is_same_v<Dynamics, qss2_integrator> ||
                  std::is_same_v<Dynamics, qss2_multiplier> ||
                  std::is_same_v<Dynamics, qss2_power> ||
                  std::is_same_v<Dynamics, qss2_square> ||
                  std::is_same_v<Dynamics, qss2_sum_2> ||
                  std::is_same_v<Dynamics, qss2_sum_3> ||
                  std::is_same_v<Dynamics, qss2_sum_4> ||
                  std::is_same_v<Dynamics, qss2_wsum_2> ||
                  std::is_same_v<Dynamics, qss2_wsum_3> ||
                  std::is_same_v<Dynamics, qss2_wsum_4> ||
                  std::is_same_v<Dynamics, qss3_integrator> ||
                  std::is_same_v<Dynamics, qss3_multiplier> ||
                  std::is_same_v<Dynamics, qss3_power> ||
                  std::is_same_v<Dynamics, qss3_square> ||
                  std::is_same_v<Dynamics, qss3_sum_2> ||
                  std::is_same_v<Dynamics, qss3_sum_3> ||
                  std::is_same_v<Dynamics, qss3_sum_4> ||
                  std::is_same_v<Dynamics, qss3_wsum_2> ||
                  std::is_same_v<Dynamics, qss3_wsum_3> ||
                  std::is_same_v<Dynamics, qss3_wsum_4> ||
                  std::is_same_v<Dynamics, integrator> ||
                  std::is_same_v<Dynamics, quantifier> ||
                  std::is_same_v<Dynamics, adder_2> ||
                  std::is_same_v<Dynamics, adder_3> ||
                  std::is_same_v<Dynamics, adder_4> ||
                  std::is_same_v<Dynamics, mult_2> ||
                  std::is_same_v<Dynamics, mult_3> ||
                  std::is_same_v<Dynamics, mult_4> ||
                  std::is_same_v<Dynamics, counter> ||
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                  std::is_same_v<Dynamics, buffer> ||
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                  std::is_same_v<Dynamics, buffer> ||
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                  std::is_same_v<Dynamics, generator> ||
                  std::is_same_v<Dynamics, constant> ||
                  std::is_same_v<Dynamics, time_func> ||
                  std::is_same_v<Dynamics, flow>)
        return str_out_1;

    if constexpr (std::is_same_v<Dynamics, cross> ||
                  std::is_same_v<Dynamics, qss1_cross> ||
                  std::is_same_v<Dynamics, qss2_cross> ||
                  std::is_same_v<Dynamics, qss3_cross>)
        return str_out_cross;

    if constexpr (std::is_same_v<Dynamics, accumulator_2>)
        return str_empty;

    irt_unreachable();
}

static constexpr const char**
get_output_port_names(const dynamics_type type) noexcept
{
    switch (type) {
    case dynamics_type::none:
        return str_empty;

    case dynamics_type::qss1_integrator:
    case dynamics_type::qss1_multiplier:
    case dynamics_type::qss1_power:
    case dynamics_type::qss1_square:
    case dynamics_type::qss1_sum_2:
    case dynamics_type::qss1_sum_3:
    case dynamics_type::qss1_sum_4:
    case dynamics_type::qss1_wsum_2:
    case dynamics_type::qss1_wsum_3:
    case dynamics_type::qss1_wsum_4:
    case dynamics_type::qss2_integrator:
    case dynamics_type::qss2_multiplier:
    case dynamics_type::qss2_power:
    case dynamics_type::qss2_square:
    case dynamics_type::qss2_sum_2:
    case dynamics_type::qss2_sum_3:
    case dynamics_type::qss2_sum_4:
    case dynamics_type::qss2_wsum_2:
    case dynamics_type::qss2_wsum_3:
    case dynamics_type::qss2_wsum_4:
    case dynamics_type::qss3_integrator:
    case dynamics_type::qss3_multiplier:
    case dynamics_type::qss3_power:
    case dynamics_type::qss3_square:
    case dynamics_type::qss3_sum_2:
    case dynamics_type::qss3_sum_3:
    case dynamics_type::qss3_sum_4:
    case dynamics_type::qss3_wsum_2:
    case dynamics_type::qss3_wsum_3:
    case dynamics_type::qss3_wsum_4:
    case dynamics_type::integrator:
    case dynamics_type::quantifier:
    case dynamics_type::adder_2:
    case dynamics_type::adder_3:
    case dynamics_type::adder_4:
    case dynamics_type::mult_2:
    case dynamics_type::mult_3:
    case dynamics_type::mult_4:
    case dynamics_type::counter:
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    case dynamics_type::buffer:
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    case dynamics_type::generator:
    case dynamics_type::constant:
    case dynamics_type::time_func:
    case dynamics_type::flow:
        return str_out_1;

    case dynamics_type::cross:
    case dynamics_type::qss1_cross:
    case dynamics_type::qss2_cross:
    case dynamics_type::qss3_cross:
        return str_out_cross;

    case dynamics_type::accumulator_2:
        return str_empty;
    }

    irt_unreachable();
}

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class streambuf : public std::streambuf
{
public:
    std::streambuf* m_stream_buffer = { nullptr };
    std::streamsize m_file_position = { 0 };
    int m_line_number = { 1 };
    int m_last_line_number = { 1 };
    int m_column = { 0 };
    int m_prev_column = { -1 };

    streambuf(std::streambuf* sbuf)
      : m_stream_buffer(sbuf)
    {}

    streambuf(const streambuf&) = delete;
    streambuf& operator=(const streambuf&) = delete;

protected:
    std::streambuf::int_type underflow() override final
    {
        return m_stream_buffer->sgetc();
    }

    std::streambuf::int_type uflow() override final
    {
        int_type rc = m_stream_buffer->sbumpc();

        m_last_line_number = m_line_number;
        if (traits_type::eq_int_type(rc, traits_type::to_int_type('\n'))) {
            ++m_line_number;
            m_prev_column = m_column + 1;
            m_column = -1;
        }

        ++m_column;
        ++m_file_position;

        return rc;
    }

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    std::streambuf::int_type pbackfail(
      std::streambuf::int_type c) override final
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    {
        if (traits_type::eq_int_type(c, traits_type::to_int_type('\n'))) {
            --m_line_number;
            m_last_line_number = m_line_number;
            m_column = m_prev_column;
            m_prev_column = 0;
        }

        --m_column;
        --m_file_position;

        if (c != traits_type::eof())
            return m_stream_buffer->sputbackc(traits_type::to_char_type(c));

        return m_stream_buffer->sungetc();
    }

    std::ios::pos_type seekoff(std::ios::off_type pos,
                               std::ios_base::seekdir dir,
                               std::ios_base::openmode mode) override final
    {
        if (dir == std::ios_base::beg &&
            pos == static_cast<std::ios::off_type>(0)) {
            m_last_line_number = 1;
            m_line_number = 1;
            m_column = 0;
            m_prev_column = -1;
            m_file_position = 0;

            return m_stream_buffer->pubseekoff(pos, dir, mode);
        }

        return std::streambuf::seekoff(pos, dir, mode);
    }

    std::ios::pos_type seekpos(std::ios::pos_type pos,
                               std::ios_base::openmode mode) override final
    {
        if (pos == static_cast<std::ios::pos_type>(0)) {
            m_last_line_number = 1;
            m_line_number = 1;
            m_column = 0;
            m_prev_column = -1;
            m_file_position = 0;

            return m_stream_buffer->pubseekpos(pos, mode);
        }

        return std::streambuf::seekpos(pos, mode);
    }
};

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class reader
{
private:
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    streambuf buf;
    std::istream is;
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    std::vector<model_id> map;
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    int model_number = 0;
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    char temp_1[32];
    char temp_2[32];

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public:
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    reader(std::istream& is_) noexcept
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      : buf(is_.rdbuf())
      , is(&buf)
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    {}

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    ~reader() noexcept = default;
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    int model_error = 0;
    int connection_error = 0;
    int line_error = 0;
    int column_error = 0;

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    status operator()(simulation& sim) noexcept
    {
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        irt_return_if_bad(do_read_model_number());

        for (int i = 0; i != model_number; ++i, ++model_error) {
            int id;
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            irt_return_if_bad(do_read_model(sim, &id));
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        }

        irt_return_if_bad(do_read_connections(sim));

        return status::success;
    }

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    status operator()(simulation& sim,
                      function_ref<void(const model_id)> f) noexcept
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    {
        irt_return_if_bad(do_read_model_number());

        for (int i = 0; i != model_number; ++i, ++model_error) {
            int id;
            irt_return_if_bad(do_read_model(sim, &id));
            f(map[id]);
        }

        irt_return_if_bad(do_read_connections(sim));

        return status::success;
    }

private:
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    void update_error_report() noexcept
    {
        line_error = buf.m_line_number;
        column_error = buf.m_column;
    }

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    status do_read_model_number() noexcept
    {
        model_number = 0;
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        update_error_report();
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        irt_return_if_fail((is >> model_number), status::io_file_format_error);
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        irt_return_if_fail(model_number > 0,
                           status::io_file_format_model_number_error);

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        try {
            map.resize(model_number, model_id{ 0 });
        } catch (const std::bad_alloc& /*e*/) {
            return status::io_not_enough_memory;
        }
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        return status::success;
    }
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    status do_read_model(simulation& sim, int* id) noexcept
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    {
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        update_error_report();
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        irt_return_if_fail((is >> *id >> temp_1),
                           status::io_file_format_model_error);
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        irt_return_if_fail(0 <= *id && *id < model_number,
                           status::io_file_format_model_error);
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        irt_return_if_bad(do_read_dynamics(sim, *id, temp_1));
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        return status::success;
    }

    status do_read_connections(simulation& sim) noexcept
    {
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        while (is) {
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            int mdl_src_id, port_src_index, mdl_dst_id, port_dst_index;
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            update_error_report();
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            if (!(is >> mdl_src_id >> port_src_index >> mdl_dst_id >>
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                  port_dst_index)) {
                if (is.eof())
                    break;
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                irt_bad_return(status::io_file_format_error);
            }
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            irt_return_if_fail(0 <= mdl_src_id && mdl_src_id < model_number,
                               status::io_file_format_model_error);
            irt_return_if_fail(0 <= mdl_dst_id && mdl_dst_id < model_number,
                               status::io_file_format_model_error);

            auto* mdl_src = sim.models.try_to_get(map[mdl_src_id]);
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            irt_return_if_fail(mdl_src, status::io_file_format_model_unknown);
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            auto* mdl_dst = sim.models.try_to_get(map[mdl_dst_id]);
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            irt_return_if_fail(mdl_dst, status::io_file_format_model_unknown);
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            port* output_port = nullptr;
            port* input_port = nullptr;
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            irt_return_if_bad(
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              sim.get_output_port(*mdl_src, port_src_index, output_port));
            irt_return_if_bad(
              sim.get_input_port(*mdl_dst, port_dst_index, input_port));

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            irt_return_if_bad(
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              sim.connect(*mdl_src, port_src_index, *mdl_dst, port_dst_index));
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            ++connection_error;
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        }

        return status::success;
    }

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    bool convert(const std::string_view dynamics_name,
                 dynamics_type* type) noexcept
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    {
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        struct string_to_type
        {
            constexpr string_to_type(const std::string_view n,
                                     const dynamics_type t)
              : name(n)
              , type(t)
            {}

            const std::string_view name;
            dynamics_type type;
        };

        static constexpr string_to_type table[] = {
            { "accumulator_2", dynamics_type::accumulator_2 },
            { "adder_2", dynamics_type::adder_2 },
            { "adder_3", dynamics_type::adder_3 },
            { "adder_4", dynamics_type::adder_4 },
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            { "buffer", dynamics_type::buffer },
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            { "constant", dynamics_type::constant },
            { "counter", dynamics_type::counter },
            { "cross", dynamics_type::cross },
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            { "flow", dynamics_type::flow },
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            { "generator", dynamics_type::generator },
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            { "integrator", dynamics_type::integrator },
            { "mult_2", dynamics_type::mult_2 },
            { "mult_3", dynamics_type::mult_3 },
            { "mult_4", dynamics_type::mult_4 },
            { "none", dynamics_type::none },
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            { "qss1_cross", dynamics_type::qss1_cross },
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            { "qss1_integrator", dynamics_type::qss1_integrator },
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            { "qss1_multiplier", dynamics_type::qss1_multiplier },
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            { "qss1_power", dynamics_type::qss1_power },
            { "qss1_square", dynamics_type::qss1_square },
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            { "qss1_sum_2", dynamics_type::qss1_sum_2 },
            { "qss1_sum_3", dynamics_type::qss1_sum_3 },
            { "qss1_sum_4", dynamics_type::qss1_sum_4 },
            { "qss1_wsum_2", dynamics_type::qss1_wsum_2 },
            { "qss1_wsum_3", dynamics_type::qss1_wsum_3 },
            { "qss1_wsum_4", dynamics_type::qss1_wsum_4 },
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            { "qss2_cross", dynamics_type::qss2_cross },
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            { "qss2_integrator", dynamics_type::qss2_integrator },
            { "qss2_multiplier", dynamics_type::qss2_multiplier },
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            { "qss2_power", dynamics_type::qss2_power },
            { "qss2_square", dynamics_type::qss2_square },
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            { "qss2_sum_2", dynamics_type::qss2_sum_2 },
            { "qss2_sum_3", dynamics_type::qss2_sum_3 },
            { "qss2_sum_4", dynamics_type::qss2_sum_4 },
            { "qss2_wsum_2", dynamics_type::qss2_wsum_2 },
            { "qss2_wsum_3", dynamics_type::qss2_wsum_3 },
            { "qss2_wsum_4", dynamics_type::qss2_wsum_4 },
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            { "qss3_cross", dynamics_type::qss3_cross },
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            { "qss3_integrator", dynamics_type::qss3_integrator },
            { "qss3_multiplier", dynamics_type::qss3_multiplier },
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            { "qss3_power", dynamics_type::qss3_power },
            { "qss3_square", dynamics_type::qss3_square },
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            { "qss3_sum_2", dynamics_type::qss3_sum_2 },
            { "qss3_sum_3", dynamics_type::qss3_sum_3 },
            { "qss3_sum_4", dynamics_type::qss3_sum_4 },
            { "qss3_wsum_2", dynamics_type::qss3_wsum_2 },
            { "qss3_wsum_3", dynamics_type::qss3_wsum_3 },
            { "qss3_wsum_4", dynamics_type::qss3_wsum_4 },
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            { "quantifier", dynamics_type::quantifier },
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            { "time_func", dynamics_type::time_func }
        };

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        static_assert(std::size(table) ==
                      static_cast<sz>(dynamics_type_size()));
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        const auto it =
          std::lower_bound(std::begin(table),
                           std::end(table),
                           dynamics_name,
                           [](const string_to_type& l,
                              const std::string_view r) { return l.name < r; });

        if (it != std::end(table) && it->name == dynamics_name) {
            *type = it->type;
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            return true;
        }

        return false;
    }

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    status do_read_dynamics(simulation& sim,
                            int id,
                            const char* dynamics_name) noexcept
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    {
        dynamics_type type;

        irt_return_if_fail(convert(dynamics_name, &type),
                           status::io_file_format_dynamics_unknown);

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        auto& mdl = sim.alloc(type);
        update_error_report();
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        auto ret =
          sim.dispatch(mdl, [this]<typename Dynamics>(Dynamics& dyn) -> status {
              irt_return_if_fail(this->read(dyn),
                                 status::io_file_format_dynamics_init_error);
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              return status::success;
          });
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        irt_return_if_bad(ret);

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        map[id] = sim.models.get_id(mdl);
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        return status::success;
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    }

    bool read(none& /*dyn*/) noexcept
    {
        return true;
    }

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    bool read(qss1_integrator& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_X));
        double& x2 = *(const_cast<double*>(&dyn.default_dQ));

        return !!(is >> x1 >> x2);
    }

    bool read(qss2_integrator& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_X));
        double& x2 = *(const_cast<double*>(&dyn.default_dQ));

        return !!(is >> x1 >> x2);
    }

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    bool read(qss3_integrator& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_X));
        double& x2 = *(const_cast<double*>(&dyn.default_dQ));

        return !!(is >> x1 >> x2);
    }

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    bool read(qss1_multiplier& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss1_sum_2& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss1_sum_3& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss1_sum_4& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss1_wsum_2& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));

        return !!(is >> x1 >> x2);
    }

    bool read(qss1_wsum_3& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3);
    }

    bool read(qss1_wsum_4& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));
        double& x4 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3 >> x4);
    }
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    bool read(qss2_multiplier& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss2_sum_2& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss2_sum_3& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss2_sum_4& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss2_wsum_2& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));

        return !!(is >> x1 >> x2);
    }

    bool read(qss2_wsum_3& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3);
    }

    bool read(qss2_wsum_4& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));
        double& x4 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3 >> x4);
    }

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    bool read(qss3_multiplier& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss3_sum_2& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss3_sum_3& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss3_sum_4& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss3_wsum_2& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));

        return !!(is >> x1 >> x2);
    }

    bool read(qss3_wsum_3& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3);
    }

    bool read(qss3_wsum_4& dyn) noexcept
    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));
        double& x4 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3 >> x4);
    }

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    bool read(integrator& dyn) noexcept
    {
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        return !!(is >> dyn.default_current_value >> dyn.default_reset_value);
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    }

    bool read(quantifier& dyn) noexcept
    {
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        if (!(is >> dyn.default_step_size >> dyn.default_past_length >>
              temp_1 >> temp_2))
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            return false;

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        if (std::strcmp(temp_1, "possible") == 0)
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            dyn.default_adapt_state = quantifier::adapt_state::possible;
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        else if (std::strcmp(temp_1, "impossible") == 0)
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            dyn.default_adapt_state = quantifier::adapt_state::impossible;
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        else if (std::strcmp(temp_1, "done") == 0)
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            dyn.default_adapt_state = quantifier::adapt_state::done;
        else
            return false;

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        if (std::strcmp(temp_2, "true") == 0)
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            dyn.default_zero_init_offset = true;
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        else if (std::strcmp(temp_2, "false") == 0)
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            dyn.default_zero_init_offset = false;
        else
            return false;

        return true;
    }

    bool read(adder_2& dyn) noexcept
    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1]);
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    }

    bool read(adder_3& dyn) noexcept
    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_input_coeffs[0] >>
                  dyn.default_input_coeffs[1] >> dyn.default_input_coeffs[2]);
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    }

    bool read(adder_4& dyn) noexcept
    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_values[3] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1] >>
                  dyn.default_input_coeffs[2] >> dyn.default_input_coeffs[3]);
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    }

    bool read(mult_2& dyn) noexcept
    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1]);
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    }

    bool read(mult_3& dyn) noexcept
    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_input_coeffs[0] >>
                  dyn.default_input_coeffs[1] >> dyn.default_input_coeffs[2]);
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    }

    bool read(mult_4& dyn) noexcept
    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_values[3] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1] >>
                  dyn.default_input_coeffs[2] >> dyn.default_input_coeffs[3]);
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    }

    bool read(counter& /*dyn*/) noexcept
    {
        return true;
    }

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    bool read(buffer& dyn) noexcept
    {
        return !!(is >> dyn.default_value >> dyn.default_offset);
    }

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    bool read(generator& dyn) noexcept
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    {
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        return !!(is >> dyn.default_offset);
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    }

    bool read(constant& dyn) noexcept
    {
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        return !!(is >> dyn.default_value);
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    }

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    bool read(qss1_cross& dyn) noexcept
    {
        return !!(is >> dyn.default_threshold);
    }

    bool read(qss2_cross& dyn) noexcept
    {
        return !!(is >> dyn.default_threshold);
    }

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    bool read(qss3_cross& dyn) noexcept
    {
        return !!(is >> dyn.default_threshold);
    }

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    bool read(qss1_power& dyn) noexcept
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    {
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        return !!(is >> dyn.default_n);
    }

    bool read(qss2_power& dyn) noexcept
    {
        return !!(is >> dyn.default_n);
    }

    bool read(qss3_power& dyn) noexcept
    {
        return !!(is >> dyn.default_n);
    }

    bool read(qss1_square& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss2_square& /*dyn*/) noexcept
    {
        return true;
    }

    bool read(qss3_square& /*dyn*/) noexcept
    {
        return true;
    }

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    bool read(cross& dyn) noexcept
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    {
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        return !!(is >> dyn.default_threshold);
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    }

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    bool read(accumulator_2& /*dyn*/) noexcept
    {
        return true;
    }

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    bool read(time_func& dyn) noexcept
    {
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        if (!(is >> temp_1))
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            return false;

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        if (std::strcmp(temp_1, "square") == 0)
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            dyn.default_f = &square_time_function;
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        else
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            dyn.default_f = &time_function;
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        return true;
    }
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    bool read(flow& dyn) noexcept
    {
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        return !!(is >> dyn.default_samplerate);
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    }
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};

struct writer
{
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    std::ostream& os;
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    std::vector<model_id> map;
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    writer(std::ostream& os_) noexcept
      : os(os_)
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    {}

    status operator()(const simulation& sim) noexcept
    {
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        os << sim.models.size() << '\n';
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        try {
            map.resize(sim.models.size(), model_id{ 0 });
        } catch (const std::bad_alloc& /*e*/) {
            return status::io_not_enough_memory;
        }
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        model* mdl = nullptr;
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        int id = 0;
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        while (sim.models.next(mdl)) {
            const auto mdl_id = sim.models.get_id(mdl);

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            os << id << ' ';
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            map[id] = mdl_id;
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            sim.dispatch(*mdl, [this, mdl](auto& dyn) -> void {
                this->write(dyn);
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            });
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            ++id;
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        }
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        mdl = nullptr;
        while (sim.models.next(mdl)) {
            sim.dispatch(*mdl, [this, &sim, &mdl]<typename Dynamics>(Dynamics& dyn) {
                if constexpr (is_detected_v<has_output_port_t, Dynamics>) {
                    for (size_t i = 0, e = std::size(dyn.y); i != e; ++i) {
                        for (const auto& elem : dyn.y[i].connections) {
                            auto* dst = sim.models.try_to_get(elem.model);
                            if (dst) {
                                auto it_out = std::find(map.begin(), map.end(), sim.models.get_id(*mdl));
                                auto it_in = std::find(map.begin(), map.end(), elem.model);

                                irt_assert(it_out != map.end());
                                irt_assert(it_in != map.end());

                                os << std::distance(map.begin(), it_out)
                                    << ' '
                                    << i 
                                    << ' '
                                    << std::distance(map.begin(), it_in)
                                    << ' '
                                    << elem.port_index
                                    << '\n';
                            }
                        }
                    }
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                }
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            });
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        }

        return status::success;
    }

private:
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    void write(const none& /*dyn*/) noexcept
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    {
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        os << "none\n";
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    }

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    void write(const qss1_integrator& dyn) noexcept
    {
        os << "qss1_integrator " << dyn.default_X << ' ' << dyn.default_dQ
           << '\n';
    }

    void write(const qss2_integrator& dyn) noexcept
    {
        os << "qss2_integrator " << dyn.default_X << ' ' << dyn.default_dQ
           << '\n';
    }

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    void write(const qss3_integrator& dyn) noexcept
    {
        os << "qss3_integrator " << dyn.default_X << ' ' << dyn.default_dQ
           << '\n';
    }

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    void write(const qss1_multiplier& /*dyn*/) noexcept
    {
        os << "qss1_multiplier\n";
    }

    void write(const qss1_sum_2& /*dyn*/) noexcept
    {
        os << "qss1_sum_2\n";
    }

    void write(const qss1_sum_3& /*dyn*/) noexcept
    {
        os << "qss1_sum_3\n";
    }

    void write(const qss1_sum_4& /*dyn*/) noexcept
    {
        os << "qss1_sum_4\n";
    }

    void write(const qss1_wsum_2& dyn) noexcept
    {
        os << "qss1_wsum_2 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << '\n';
    }

    void write(const qss1_wsum_3& dyn) noexcept
    {
        os << "qss1_wsum_3 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << '\n';
    }

    void write(const qss1_wsum_4& dyn) noexcept
    {
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        os << "qss1_wsum_4 " << dyn.default_input_coeffs[0] << ' '
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           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << ' ' << dyn.default_input_coeffs[3] << '\n';
    }
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    void write(const qss2_multiplier& /*dyn*/) noexcept
    {
        os << "qss2_multiplier\n";
    }

    void write(const qss2_sum_2& /*dyn*/) noexcept
    {
        os << "qss2_sum_2\n";
    }

    void write(const qss2_sum_3& /*dyn*/) noexcept
    {
        os << "qss2_sum_3\n";
    }

    void write(const qss2_sum_4& /*dyn*/) noexcept
    {
        os << "qss2_sum_4\n";
    }

    void write(const qss2_wsum_2& dyn) noexcept
    {
        os << "qss2_wsum_2 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << '\n';
    }

    void write(const qss2_wsum_3& dyn) noexcept
    {
        os << "qss2_wsum_3 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << '\n';
    }

    void write(const qss2_wsum_4& dyn) noexcept
    {
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        os << "qss2_wsum_4 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << ' ' << dyn.default_input_coeffs[3] << '\n';
    }

    void write(const qss3_multiplier& /*dyn*/) noexcept
    {
        os << "qss3_multiplier\n";
    }

    void write(const qss3_sum_2& /*dyn*/) noexcept
    {
        os << "qss3_sum_2\n";
    }

    void write(const qss3_sum_3& /*dyn*/) noexcept
    {
        os << "qss3_sum_3\n";
    }

    void write(const qss3_sum_4& /*dyn*/) noexcept
    {
        os << "qss3_sum_4\n";
    }

    void write(const qss3_wsum_2& dyn) noexcept
    {
        os << "qss3_wsum_2 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << '\n';
    }

    void write(const qss3_wsum_3& dyn) noexcept
    {
        os << "qss3_wsum_3 " << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << '\n';
    }

    void write(const qss3_wsum_4& dyn) noexcept
    {
        os << "qss3_wsum_4 " << dyn.default_input_coeffs[0] << ' '
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           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << ' ' << dyn.default_input_coeffs[3] << '\n';
    }

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    void write(const integrator& dyn) noexcept
    {
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        os << "integrator " << dyn.default_current_value << ' '
           << dyn.default_reset_value << '\n';
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    }

    void write(const quantifier& dyn) noexcept
    {
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        os << "quantifier " << dyn.default_step_size << ' '
           << dyn.default_past_length << ' '
           << ((dyn.default_adapt_state == quantifier::adapt_state::possible)
                 ? "possible "
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               : dyn.default_adapt_state == quantifier::adapt_state::impossible
                 ? "impossibe "
                 : "done ")
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           << (dyn.default_zero_init_offset == true ? "true\n" : "false\n");
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    }

    void write(const adder_2& dyn) noexcept
    {
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        os << "adder_2 " << dyn.default_values[0] << ' '
           << dyn.default_values[1] << ' ' << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << '\n';
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    }

    void write(const adder_3& dyn) noexcept
    {
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        os << "adder_3 " << dyn.default_values[0] << ' '
           << dyn.default_values[1] << ' ' << dyn.default_values[2] << ' '
           << dyn.default_input_coeffs[0] << ' ' << dyn.default_input_coeffs[1]
           << ' ' << dyn.default_input_coeffs[2] << '\n';
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    }

    void write(const adder_4& dyn) noexcept
    {
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        os << "adder_4 " << dyn.default_values[0] << ' '
           << dyn.default_values[1] << ' ' << dyn.default_values[2] << ' '
           << dyn.default_values[3] << ' ' << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << ' ' << dyn.default_input_coeffs[3] << '\n';
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    }

    void write(const mult_2& dyn) noexcept
    {
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        os << "mult_2 " << dyn.default_values[0] << ' ' << dyn.default_values[1]
           << ' ' << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << '\n';
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    }

    void write(const mult_3& dyn) noexcept
    {
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        os << "mult_3 " << dyn.default_values[0] << ' ' << dyn.default_values[1]
           << ' ' << dyn.default_values[2] << ' ' << dyn.default_input_coeffs[0]
           << ' ' << dyn.default_input_coeffs[1] << ' '
           << dyn.default_input_coeffs[2] << '\n';
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    }

    void write(const mult_4& dyn) noexcept
    {
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        os << "mult_4 " << dyn.default_values[0] << ' ' << dyn.default_values[1]
           << ' ' << dyn.default_values[2] << ' ' << dyn.default_values[3]
           << ' ' << dyn.default_input_coeffs[0] << ' '
           << dyn.default_input_coeffs[1] << ' ' << dyn.default_input_coeffs[2]
           << ' ' << dyn.default_input_coeffs[3] << '\n';
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    }

    void write(const counter& /*dyn*/) noexcept
    {
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        os << "counter\n";
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    }

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    void write(const buffer& dyn) noexcept
    {
        os << "buffer " << dyn.default_value << ' ' << dyn.default_offset
           << '\n';
    }

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    void write(const generator& dyn) noexcept
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    {
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    os << "generator " << ' ' << dyn.default_offset << '\n';
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    }

    void write(const constant& dyn) noexcept
    {
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        os << "constant " << dyn.default_value << '\n';
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    }

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    void write(const qss1_cross& dyn) noexcept
    {
        os << "qss1_cross " << dyn.default_threshold << '\n';
    }

    void write(const qss2_cross& dyn) noexcept
    {
        os << "qss2_cross " << dyn.default_threshold << '\n';
    }

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    void write(const qss3_cross& dyn) noexcept
    {
        os << "qss3_cross " << dyn.default_threshold << '\n';
    }

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    void write(const qss1_power& dyn) noexcept
    {
        os << "qss1_power " << dyn.default_n << '\n';
    }

    void write(const qss2_power& dyn) noexcept
    {
        os << "qss2_power " << dyn.default_n << '\n';
    }

    void write(const qss3_power& dyn) noexcept
    {
        os << "qss3_power " << dyn.default_n << '\n';
    }

    void write(const qss1_square& /*dyn*/) noexcept
    {
        os << "qss1_square\n";
    }

    void write(const qss2_square& /*dyn*/) noexcept
    {
        os << "qss2_square\n";
    }

    void write(const qss3_square& /*dyn*/) noexcept
    {
        os << "qss3_square\n";
    }

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    void write(const cross& dyn) noexcept
    {
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        os << "cross " << dyn.default_threshold << '\n';
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    }

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    void write(const accumulator_2& /*dyn*/) noexcept
    {
        os << "accumulator_2\n";
    }

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    void write(const time_func& dyn) noexcept
    {
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        os << "time_func "
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            << (dyn.default_f == &time_function ? "time\n" : "square\n");
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    }
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    void write(const flow& dyn) noexcept
    {
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        os << "flow " << dyn.default_samplerate << '\n';
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    }
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};

class dot_writer
{
private:
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    std::ostream& os;
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public:
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    dot_writer(std::ostream& os_)
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        : os(os_)
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    {}

    void operator()(const simulation& sim) noexcept
    {
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        os << "digraph graphname {\n";
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        irt::model* mdl = nullptr;
        while (sim.models.next(mdl)) {
            sim.dispatch(*mdl, [this, &sim, &mdl]<typename Dynamics>(Dynamics & dyn)
            {
                if constexpr (is_detected_v<has_output_port_t, Dynamics>) {
                    for (size_t i = 0, e = std::size(dyn.y); i != e; ++i) {
                        for (const auto& elem : dyn.y[i].connections) {
                            auto* dst = sim.models.try_to_get(elem.model);
                            if (dst) {
                                auto src_id = sim.models.get_id(*mdl);

                                os << irt::get_key(src_id)
                                   << " -> "
                                   << irt::get_key(elem.model)
                                   << " [label=\""
                                   << i
                                   << " - "
                                   << elem.port_index
                                   << "\"];\n";
                            }
                        }
                    }
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                }
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            });
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        }
    }
};

} // namespace irt

#endif