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[feat]新增时间表达式TimeExpression，一次解析多次使用，支持${dt+1M+4d:yy-MM-dd}
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| using NewLife; | ||
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| namespace AntJob.Data; | ||
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| /// <summary>时间表达式，一次解析多次使用。如{dt+1M+5d:yyyyMMdd}</summary> | ||
| public class TimeExpression | ||
| { | ||
| #region 属性 | ||
| /// <summary>表达式</summary> | ||
| public String Expression { get; set; } | ||
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| /// <summary>变量名</summary> | ||
| public String VarName { get; set; } = "dt"; | ||
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| /// <summary>格式化字符串</summary> | ||
| public String Format { get; set; } | ||
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| /// <summary>时间表达式项集合</summary> | ||
| public IList<TimeExpressionItem> Items { get; } = []; | ||
| #endregion | ||
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| #region 构造 | ||
| /// <summary>实例化时间表达式</summary> | ||
| public TimeExpression() { } | ||
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| /// <summary>实例化时间表达式</summary> | ||
| public TimeExpression(String expression) => Parse(expression); | ||
| #endregion | ||
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| #region 方法 | ||
| /// <summary>解析表达式</summary> | ||
| public Boolean Parse(String expression) | ||
| { | ||
| var p1 = expression.IndexOf('{'); | ||
| if (p1 < 0) return false; | ||
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| var p2 = expression.IndexOf('}', p1); | ||
| if (p2 < 0) return false; | ||
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| expression = expression.Substring(p1 + 1, p2 - p1 - 1); | ||
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| // 循环查找 | ||
| var ms = Items; | ||
| p1 = -1; | ||
| while (true) | ||
| { | ||
| p2 = expression.IndexOfAny(['+', '-', ':', ','], p1 + 1); | ||
| if (p2 < 0) p2 = expression.Length; | ||
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| // 第一段是变量名 | ||
| if (p1 < 0 && p2 > 0) | ||
| { | ||
| VarName = expression[0..p2]; | ||
| } | ||
| else if (expression[p1] is '+' or '-') | ||
| { | ||
| var str = expression[p1..p2]; | ||
| var item = new TimeExpressionItem(); | ||
| if (!item.Parse(str)) throw new InvalidDataException($"Invalid [{str}]"); | ||
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| ms.Add(item); | ||
| } | ||
| else if (expression[p1] is ':' or ',') | ||
| { | ||
| // 最后一段是格式化字符串 | ||
| p2 = expression.Length; | ||
| Format = expression[(p1 + 1)..p2]; | ||
| } | ||
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| if (p2 >= expression.Length) break; | ||
| p1 = p2; | ||
| } | ||
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| // 默认天级 | ||
| if (ms.Count == 0) ms.Add(new TimeExpressionItem { Level = "d", Value = 0 }); | ||
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| Expression = expression; | ||
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| return true; | ||
| } | ||
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| /// <summary>执行时间偏移</summary> | ||
| public DateTime Execute(DateTime time) | ||
| { | ||
| foreach (var item in Items) | ||
| { | ||
| time = item.Execute(time); | ||
| } | ||
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| return time; | ||
| } | ||
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| /// <summary>构建时间字符串</summary> | ||
| public String Build(DateTime time) | ||
| { | ||
| time = Execute(time); | ||
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| var ms = Items; | ||
| var format = Format; | ||
| if (format.IsNullOrEmpty() && ms.Count > 0) format = ms[ms.Count - 1].GetFormat(); | ||
| if (format.IsNullOrEmpty()) format = "yyyyMMdd"; | ||
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| return time.ToString(format); | ||
| } | ||
| #endregion | ||
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| /// <summary>处理时间偏移模版。如{dt+1M+5d:yyyyMMdd}</summary> | ||
| /// <param name="template"></param> | ||
| /// <param name="time"></param> | ||
| /// <returns></returns> | ||
| public static String Build(String template, DateTime time) | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
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| /// <summary>时间表达式项。如+5d</summary> | ||
| public class TimeExpressionItem | ||
| { | ||
| /// <summary>级别。如y/M/d/H/m/w</summary> | ||
| public String Level { get; set; } | ||
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| /// <summary>数值。包括正负</summary> | ||
| public Int32 Value { get; set; } | ||
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| /// <summary>分解表达式项。如+5d</summary> | ||
| /// <param name="value"></param> | ||
| /// <returns></returns> | ||
| public Boolean Parse(String value) | ||
| { | ||
| if (value.IsNullOrEmpty() || value.Length < 3) return false; | ||
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| Level = value[^1..]; | ||
| Value = value[..^1].ToInt(); | ||
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| return true; | ||
| } | ||
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| /// <summary>执行时间偏移</summary> | ||
| public DateTime Execute(DateTime time) | ||
| { | ||
| return Level switch | ||
| { | ||
| "y" => new DateTime(time.Year, 1, 1, 0, 0, 0, time.Kind).AddYears(Value), | ||
| "M" => new DateTime(time.Year, time.Month, 1, 0, 0, 0, time.Kind).AddMonths(Value), | ||
| "d" => new DateTime(time.Year, time.Month, time.Day, 0, 0, 0, time.Kind).AddDays(Value), | ||
| "H" => new DateTime(time.Year, time.Month, time.Day, time.Hour, 0, 0, time.Kind).AddHours(Value), | ||
| "m" => new DateTime(time.Year, time.Month, time.Day, time.Hour, time.Minute, 0, time.Kind).AddMinutes(Value), | ||
| "s" => new DateTime(time.Year, time.Month, time.Day, time.Hour, time.Minute, time.Second, time.Kind).AddSeconds(Value), | ||
| "w" => new DateTime(time.Year, time.Month, time.Day, 0, 0, 0, time.Kind).AddDays(Value * 7), | ||
| _ => time, | ||
| }; | ||
| } | ||
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| /// <summary>获取格式化字符串</summary> | ||
| public String GetFormat() | ||
| { | ||
| return Level switch | ||
| { | ||
| "y" => "yyyy", | ||
| "M" => "yyyyMM", | ||
| "d" => "yyyyMMdd", | ||
| "H" => "yyyyMMddHH", | ||
| "m" => "yyyyMMddHHmm", | ||
| "s" => "yyyyMMddHHmmss", | ||
| "w" => "yyyyww", | ||
| _ => "", | ||
| }; | ||
| } | ||
| } |
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