cron_expression.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2026 Marco Craveiro <marco.craveiro@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#pragma once
 
#include <chrono>
#include <expected>
#include <string>
#include <string_view>
 
namespace ores::scheduler::domain {
 
class cron_expression final {
public:
    cron_expression();
 
    [[nodiscard]] static std::expected<cron_expression, std::string>
    from_string(std::string_view expr);
 
    [[nodiscard]] const std::string& to_string() const noexcept;
 
    [[nodiscard]] std::chrono::system_clock::time_point
    next_occurrence(std::chrono::system_clock::time_point after
                    = std::chrono::system_clock::now()) const;
 
    bool operator==(const cron_expression& other) const noexcept = default;
 
private:
    explicit cron_expression(std::string validated_expr);
 
    std::string expr_;
};
 
} // namespace ores::scheduler::domain