47 lines
1.5 KiB
C#
47 lines
1.5 KiB
C#
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using System.Text.RegularExpressions;
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namespace w4c_workflows.Services;
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/// <summary>
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/// Parses human durations like "45s", "30m", "2h", "1d" (also compound forms
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/// like "1h30m"). Used by YAML validation and the interval trigger scheduler.
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/// </summary>
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public static partial class DurationParser
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{
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[GeneratedRegex(@"(?<num>\d+(?:\.\d+)?)(?<unit>ms|s|m|h|d)", RegexOptions.Compiled)]
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private static partial Regex PartRegex();
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public static bool TryParse(string? text, out TimeSpan result)
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{
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result = TimeSpan.Zero;
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if (string.IsNullOrWhiteSpace(text))
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return false;
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var matches = PartRegex().Matches(text);
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if (matches.Count == 0)
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return false;
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var total = TimeSpan.Zero;
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foreach (Match match in matches)
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{
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var value = double.Parse(match.Groups["num"].Value, System.Globalization.CultureInfo.InvariantCulture);
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var unit = match.Groups["unit"].Value;
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total += unit switch
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{
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"ms" => TimeSpan.FromMilliseconds(value),
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"s" => TimeSpan.FromSeconds(value),
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"m" => TimeSpan.FromMinutes(value),
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"h" => TimeSpan.FromHours(value),
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"d" => TimeSpan.FromDays(value),
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_ => throw new InvalidOperationException($"Unknown unit {unit}"),
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};
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}
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if (total <= TimeSpan.Zero)
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return false;
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result = total;
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return true;
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}
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}
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