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Closes #154 --------- Signed-off-by: mctaylors <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| using System.Globalization; | ||
| using System.Text.RegularExpressions; | ||
| using JetBrains.Annotations; | ||
| using Remora.Commands.Parsers; | ||
| using Remora.Results; | ||
|
|
||
| namespace Octobot.Parsers; | ||
|
|
||
| /// <summary> | ||
| /// Parses <see cref="TimeSpan"/>s. | ||
| /// </summary> | ||
| [PublicAPI] | ||
| public partial class TimeSpanParser : AbstractTypeParser<TimeSpan> | ||
| { | ||
| private static readonly Regex Pattern = ParseRegex(); | ||
|
|
||
| /// <summary> | ||
| /// Parses a <see cref="TimeSpan"/> from the <paramref name="timeSpanString"/>. | ||
| /// </summary> | ||
| /// <returns> | ||
| /// The parsed <see cref="TimeSpan"/>, or <see cref="ArgumentInvalidError"/> if parsing failed. | ||
| /// </returns> | ||
| public static Result<TimeSpan> TryParse(string timeSpanString) | ||
| { | ||
| if (timeSpanString.StartsWith('-')) | ||
| { | ||
| return new ArgumentInvalidError(nameof(timeSpanString), "TimeSpans cannot be negative."); | ||
| } | ||
|
|
||
| if (TimeSpan.TryParse(timeSpanString, DateTimeFormatInfo.InvariantInfo, out var parsedTimeSpan)) | ||
| { | ||
| return parsedTimeSpan; | ||
| } | ||
|
|
||
| var matches = ParseRegex().Matches(timeSpanString); | ||
| return matches.Count > 0 | ||
| ? ParseFromRegex(matches) | ||
| : new ArgumentInvalidError(nameof(timeSpanString), "The regex did not produce any matches."); | ||
| } | ||
|
|
||
| private static Result<TimeSpan> ParseFromRegex(MatchCollection matches) | ||
| { | ||
| var timeSpan = TimeSpan.Zero; | ||
|
|
||
| foreach (var groups in matches.Select(match => match.Groups | ||
| .Cast<Group>() | ||
| .Where(g => g.Success) | ||
| .Skip(1) | ||
| .Select(g => (g.Name, g.Value)))) | ||
| { | ||
| foreach ((var key, var groupValue) in groups) | ||
| { | ||
| if (!int.TryParse(groupValue, out var parsedIntegerValue)) | ||
| { | ||
| return new ArgumentInvalidError(nameof(groupValue), "The input value was not an integer."); | ||
| } | ||
|
|
||
| var now = DateTimeOffset.UtcNow; | ||
| timeSpan += key switch | ||
| { | ||
| "Years" => now.AddYears(parsedIntegerValue) - now, | ||
| "Months" => now.AddMonths(parsedIntegerValue) - now, | ||
| "Weeks" => TimeSpan.FromDays(parsedIntegerValue * 7), | ||
| "Days" => TimeSpan.FromDays(parsedIntegerValue), | ||
| "Hours" => TimeSpan.FromHours(parsedIntegerValue), | ||
| "Minutes" => TimeSpan.FromMinutes(parsedIntegerValue), | ||
| "Seconds" => TimeSpan.FromSeconds(parsedIntegerValue), | ||
| _ => throw new ArgumentOutOfRangeException(key) | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| return timeSpan; | ||
| } | ||
|
|
||
| [GeneratedRegex("(?<Years>\\d+(?=y|л|г))|(?<Months>\\d+(?=mo|мес))|(?<Weeks>\\d+(?=w|н|нед))|(?<Days>\\d+(?=d|д|дн))|(?<Hours>\\d+(?=h|ч))|(?<Minutes>\\d+(?=m|min|мин|м))|(?<Seconds>\\d+(?=s|sec|с|сек))")] | ||
| private static partial Regex ParseRegex(); | ||
| } |