Modules/Framework/Furion.TaskScheduler/Cron/CronExpression.cs

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// MIT License
//
// Copyright (c) 2020-2022 百小僧, Baiqian Co.,Ltd and Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

using System.Runtime.CompilerServices;
using System.Text;

namespace Furion.TaskScheduler;

/// <summary>
/// Cron 表达式的解析器和调度程序
/// <para>代码参考自：https://github.com/HangfireIO/Cronos </para>
/// </summary>
/// <remarks>TaskScheduler 将于2022年12月31日移除，请使用 Scheduler 替代</remarks>
[Obsolete("The <TaskScheduler> will be removed on December 31, 2022. Please use the <Scheduler> instead.")]
[SuppressSniffer]
public sealed class CronExpression : IEquatable<CronExpression>
{
    private const long NotFound = 0;

    private const int MinNthDayOfWeek = 1;
    private const int MaxNthDayOfWeek = 5;
    private const int SundayBits = 0b1000_0001;

    private const int MaxYear = 2099;

    private static readonly TimeZoneInfo UtcTimeZone = TimeZoneInfo.Utc;

    private static readonly CronExpression Yearly = Parse("0 0 1 1 *");
    private static readonly CronExpression Weekly = Parse("0 0 * * 0");
    private static readonly CronExpression Monthly = Parse("0 0 1 * *");
    private static readonly CronExpression Daily = Parse("0 0 * * *");
    private static readonly CronExpression Hourly = Parse("0 * * * *");
    private static readonly CronExpression Minutely = Parse("* * * * *");
    private static readonly CronExpression Secondly = Parse("* * * * * *", CronFormat.IncludeSeconds);

    private static readonly int[] DeBruijnPositions =
    {
            0, 1, 2, 53, 3, 7, 54, 27,
            4, 38, 41, 8, 34, 55, 48, 28,
            62, 5, 39, 46, 44, 42, 22, 9,
            24, 35, 59, 56, 49, 18, 29, 11,