tabulate.hpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//
 
#pragma once

 
#include "shambase/aliases_int.hpp"
#include "shambase/exception.hpp"
#include "shambase/string.hpp"
#include <cstddef>
#include <stdexcept>
#include <string>
#include <variant>
#include <vector>
 
namespace shambase {
 
    struct table {
 
        size_t cols_count;
        table(size_t column_count) : cols_count(column_count) {}
 
        struct rule {};
        struct double_rule {};
        struct rulled_data {
            std::vector<std::string> colnames;
        };
        enum positionning {
            left,
            right,
            center,
        };
        struct data {
            std::vector<std::string> cols;
            positionning position;
        };
 
        std::vector<std::variant<rule, double_rule, rulled_data, data>> table_lines;
 
        void add_rule() { table_lines.push_back(rule{}); }
        void add_double_rule() { table_lines.push_back(double_rule{}); }
        void add_rulled_data(const std::vector<std::string> &colnames) {
            if (colnames.size() != cols_count) {
                throw make_except_with_loc<std::invalid_argument>(shambase::format(
                    "the number of column does not match colnames.size() != cols_count ({} != {})",
                    colnames.size(),
                    cols_count));
            }
            table_lines.push_back(rulled_data{colnames});
        }
        void add_data(const std::vector<std::string> &cols, positionning position) {
            if (cols.size() != cols_count) {
                throw make_except_with_loc<std::invalid_argument>(shambase::format(
                    "the number of column does not match cols.size() != cols_count ({} != {})",
                    cols.size(),
                    cols_count));
            }
            table_lines.push_back(data{.cols = cols, .position = position});
        }
 
        std::vector<size_t> compute_widths() {
            std::vector<size_t> widths(cols_count);
            for (auto &line : table_lines) {
                if (data *data_line = std::get_if<data>(&line)) {
                    for (u32 i = 0; i < cols_count; i++) {
                        widths[i] = std::max(widths[i], data_line->cols[i].size());
                    }
                } else if (rulled_data *head_and_ruller_line = std::get_if<rulled_data>(&line)) {
                    for (u32 i = 0; i < cols_count; i++) {
                        widths[i] = std::max(widths[i], head_and_ruller_line->colnames[i].size());
                    }
                }
            }
            return widths;
        }
 
        std::string render() {
 
            std::vector<size_t> widths = compute_widths();
 
            std::string print = "";
            for (auto &line : table_lines) {
                if (data *data_line = std::get_if<data>(&line)) {
                    print += "\n|";
                    for (u32 i = 0; i < cols_count; i++) {
                        if (data_line->position == left) {
                            print += shambase::format(" {:<{}} |", data_line->cols[i], widths[i]);
                        } else if (data_line->position == right) {
                            print += shambase::format(" {:>{}} |", data_line->cols[i], widths[i]);
                        } else if (data_line->position == center) {
                            print += shambase::format(" {:^{}} |", data_line->cols[i], widths[i]);
                        }
                    }
 
                } else if (rulled_data *head_and_ruller_line = std::get_if<rulled_data>(&line)) {
                    std::string tmp = "+";
                    for (u32 i = 0; i < cols_count; i++) {
                        tmp += shambase::format(
                            " {:^{}} +", head_and_ruller_line->colnames[i], widths[i]);
                    }
 
                    auto neigh_char_is_good = [&](char c) -> bool {
                        return c == ' ' || c == '-' || c == '<' || c == '>' || c == '+';
                    };
 
                    std::vector<bool> set_to_space = std::vector<bool>(tmp.size(), false);
                    // if the next and previous chars are space and i am a space then set me to true
                    for (size_t i = 1; i < tmp.size() - 1; i++) {
                        if (tmp[i] == ' ' && neigh_char_is_good(tmp[i - 1])
                            && neigh_char_is_good(tmp[i + 1])) {
                            set_to_space[i] = true;
                        }
                    }
                    // replace the spaces by '-'
                    for (size_t i = 0; i < tmp.size() - 1; i++) {
                        if (set_to_space[i]) {
                            tmp[i] = '-';
                        }
                    }
                    print += "\n" + tmp;
                } else if (rule *rule_line = std::get_if<rule>(&line)) {
                    print += "\n+";
                    for (u32 i = 0; i < cols_count; i++) {
                        print += shambase::format(
                            "-{:<{}}-+", std::string(widths[i], '-'), widths[i]);
                    }
                } else if (double_rule *double_rule_line = std::get_if<double_rule>(&line)) {
                    print += "\n+";
                    for (u32 i = 0; i < cols_count; i++) {
                        print += shambase::format(
                            "={:<{}}=+", std::string(widths[i], '='), widths[i]);
                    }
                }
            }
            return print;
        }
    };
 
} // namespace shambase