Modules/Framework/Furion.TaskScheduler/Cron/CronField.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.

namespace Furion.TaskScheduler;

/// <summary>
/// Cron 表达式内置字段
/// </summary>
internal sealed class CronField
{
    private static readonly string[] MonthNames =
    {
            null, "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"
        };

    private static readonly string[] DayOfWeekNames =
    {
            "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT", "SUN"
        };

    private static readonly int[] MonthNamesArray = new int[MonthNames.Length];
    private static readonly int[] DayOfWeekNamesArray = new int[DayOfWeekNames.Length];

    // 0 and 7 are both Sunday, for compatibility reasons.
    public static readonly CronField DaysOfWeek = new("Days of week", 0, 7, DayOfWeekNamesArray, false);

    public static readonly CronField Months = new("Months", 1, 12, MonthNamesArray, false);
    public static readonly CronField DaysOfMonth = new("Days of month", 1, 31, null, false);
    public static readonly CronField Hours = new("Hours", 0, 23, null, true);
    public static readonly CronField Minutes = new("Minutes", 0, 59, null, true);
    public static readonly CronField Seconds = new("Seconds", 0, 59, null, true);

    static CronField()
    {
        for (var i = 1; i < MonthNames.Length; i++)
        {
            var name = MonthNames[i].ToUpperInvariant();
            var array = new char[3];
            array[0] = name[0];
            array[1] = name[1];
            array[2] = name[2];