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329
src/NzbDrone.Core/Parser/DateTimeUtil.cs
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329
src/NzbDrone.Core/Parser/DateTimeUtil.cs
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using System;
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using System.Globalization;
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using System.Text.RegularExpressions;
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namespace NzbDrone.Core.Parser
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{
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public static class DateTimeUtil
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{
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public const string Rfc1123ZPattern = "ddd, dd MMM yyyy HH':'mm':'ss z";
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private static readonly Regex _TimeAgoRegexp = new Regex(@"(?i)\bago", RegexOptions.Compiled);
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private static readonly Regex _TodayRegexp = new Regex(@"(?i)\btoday(?:[\s,]+(?:at){0,1}\s*|[\s,]*|$)", RegexOptions.Compiled);
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private static readonly Regex _TomorrowRegexp = new Regex(@"(?i)\btomorrow(?:[\s,]+(?:at){0,1}\s*|[\s,]*|$)", RegexOptions.Compiled);
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private static readonly Regex _YesterdayRegexp = new Regex(@"(?i)\byesterday(?:[\s,]+(?:at){0,1}\s*|[\s,]*|$)", RegexOptions.Compiled);
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private static readonly Regex _DaysOfWeekRegexp = new Regex(@"(?i)\b(monday|tuesday|wednesday|thursday|friday|saturday|sunday)\s+at\s+", RegexOptions.Compiled);
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private static readonly Regex _MissingYearRegexp = new Regex(@"^(\d{1,2}-\d{1,2})(\s|$)", RegexOptions.Compiled);
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private static readonly Regex _MissingYearRegexp2 = new Regex(@"^(\d{1,2}\s+\w{3})\s+(\d{1,2}\:\d{1,2}.*)$", RegexOptions.Compiled); // 1 Jan 10:30
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public static DateTime UnixTimestampToDateTime(long unixTime)
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{
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var dt = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
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dt = dt.AddSeconds(unixTime).ToLocalTime();
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return dt;
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}
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public static DateTime UnixTimestampToDateTime(double unixTime)
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{
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var unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
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var unixTimeStampInTicks = (long)(unixTime * TimeSpan.TicksPerSecond);
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return new DateTime(unixStart.Ticks + unixTimeStampInTicks);
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}
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public static double DateTimeToUnixTimestamp(DateTime dt)
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{
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var date = dt.ToUniversalTime();
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var ticks = date.Ticks - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).Ticks;
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var ts = ticks / TimeSpan.TicksPerSecond;
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return ts;
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}
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// ex: "2 hours 1 day"
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public static DateTime FromTimeAgo(string str)
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{
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str = str.ToLowerInvariant();
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if (str.Contains("now"))
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{
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return DateTime.SpecifyKind(DateTime.Now, DateTimeKind.Local);
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}
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str = str.Replace(",", "");
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str = str.Replace("ago", "");
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str = str.Replace("and", "");
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var timeAgo = TimeSpan.Zero;
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var timeagoRegex = new Regex(@"\s*?([\d\.]+)\s*?([^\d\s\.]+)\s*?");
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var timeagoMatches = timeagoRegex.Match(str);
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while (timeagoMatches.Success)
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{
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var val = ParseUtil.CoerceFloat(timeagoMatches.Groups[1].Value);
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var unit = timeagoMatches.Groups[2].Value;
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timeagoMatches = timeagoMatches.NextMatch();
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if (unit.Contains("sec") || unit == "s")
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{
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timeAgo += TimeSpan.FromSeconds(val);
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}
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else if (unit.Contains("min") || unit == "m")
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{
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timeAgo += TimeSpan.FromMinutes(val);
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}
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else if (unit.Contains("hour") || unit.Contains("hr") || unit == "h")
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{
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timeAgo += TimeSpan.FromHours(val);
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}
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else if (unit.Contains("day") || unit == "d")
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{
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timeAgo += TimeSpan.FromDays(val);
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}
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else if (unit.Contains("week") || unit.Contains("wk") || unit == "w")
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{
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timeAgo += TimeSpan.FromDays(val * 7);
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}
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else if (unit.Contains("month") || unit == "mo")
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{
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timeAgo += TimeSpan.FromDays(val * 30);
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}
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else if (unit.Contains("year") || unit == "y")
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{
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timeAgo += TimeSpan.FromDays(val * 365);
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}
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else
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{
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throw new Exception("TimeAgo parsing failed, unknown unit: " + unit);
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}
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}
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return DateTime.SpecifyKind(DateTime.Now - timeAgo, DateTimeKind.Local);
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}
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// Uses the DateTimeRoutines library to parse the date
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// http://www.codeproject.com/Articles/33298/C-Date-Time-Parser
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public static DateTime FromFuzzyTime(string str, string format = null)
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{
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//var dtFormat = format == "UK" ?
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// DateTimeRoutines.DateTimeRoutines.DateTimeFormat.UkDate :
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// DateTimeRoutines.DateTimeRoutines.DateTimeFormat.UsaDate;
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//if (DateTimeRoutines.DateTimeRoutines.TryParseDateOrTime(
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// str, dtFormat, out DateTimeRoutines.DateTimeRoutines.ParsedDateTime dt))
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// return dt.DateTime;
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if (DateTime.TryParse(str, out var dateTimeParsed))
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{
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return dateTimeParsed;
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}
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throw new Exception("FromFuzzyTime parsing failed");
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}
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public static DateTime FromUnknown(string str, string format = null)
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{
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try
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{
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str = ParseUtil.NormalizeSpace(str);
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if (str.ToLower().Contains("now"))
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{
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return DateTime.UtcNow;
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}
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// ... ago
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var match = _TimeAgoRegexp.Match(str);
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if (match.Success)
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{
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var timeago = str;
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return FromTimeAgo(timeago);
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}
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// Today ...
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match = _TodayRegexp.Match(str);
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if (match.Success)
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{
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var time = str.Replace(match.Groups[0].Value, "");
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var dt = DateTime.SpecifyKind(DateTime.UtcNow.Date, DateTimeKind.Unspecified);
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dt += ParseTimeSpan(time);
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return dt;
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}
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// Yesterday ...
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match = _YesterdayRegexp.Match(str);
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if (match.Success)
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{
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var time = str.Replace(match.Groups[0].Value, "");
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var dt = DateTime.SpecifyKind(DateTime.UtcNow.Date, DateTimeKind.Unspecified);
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dt += ParseTimeSpan(time);
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dt -= TimeSpan.FromDays(1);
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return dt;
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}
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// Tomorrow ...
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match = _TomorrowRegexp.Match(str);
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if (match.Success)
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{
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var time = str.Replace(match.Groups[0].Value, "");
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var dt = DateTime.SpecifyKind(DateTime.UtcNow.Date, DateTimeKind.Unspecified);
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dt += ParseTimeSpan(time);
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dt += TimeSpan.FromDays(1);
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return dt;
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}
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// [day of the week] at ... (eg: Saturday at 14:22)
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match = _DaysOfWeekRegexp.Match(str);
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if (match.Success)
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{
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var time = str.Replace(match.Groups[0].Value, "");
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var dt = DateTime.SpecifyKind(DateTime.UtcNow.Date, DateTimeKind.Unspecified);
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dt += ParseTimeSpan(time);
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DayOfWeek dow;
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var groupMatchLower = match.Groups[1].Value.ToLower();
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if (groupMatchLower.StartsWith("monday"))
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{
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dow = DayOfWeek.Monday;
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}
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else if (groupMatchLower.StartsWith("tuesday"))
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{
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dow = DayOfWeek.Tuesday;
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}
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else if (groupMatchLower.StartsWith("wednesday"))
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{
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dow = DayOfWeek.Wednesday;
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}
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else if (groupMatchLower.StartsWith("thursday"))
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{
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dow = DayOfWeek.Thursday;
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}
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else if (groupMatchLower.StartsWith("friday"))
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{
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dow = DayOfWeek.Friday;
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}
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else if (groupMatchLower.StartsWith("saturday"))
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{
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dow = DayOfWeek.Saturday;
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}
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else
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{
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dow = DayOfWeek.Sunday;
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}
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while (dt.DayOfWeek != dow)
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{
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dt = dt.AddDays(-1);
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}
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return dt;
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}
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try
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{
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// try parsing the str as an unix timestamp
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var unixTimeStamp = long.Parse(str);
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return UnixTimestampToDateTime(unixTimeStamp);
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}
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catch (FormatException)
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{
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// it wasn't a timestamp, continue....
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}
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// add missing year
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match = _MissingYearRegexp.Match(str);
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if (match.Success)
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{
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var date = match.Groups[1].Value;
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var newDate = DateTime.Now.Year + "-" + date;
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str = str.Replace(date, newDate);
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}
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// add missing year 2
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match = _MissingYearRegexp2.Match(str);
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if (match.Success)
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{
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var date = match.Groups[1].Value;
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var time = match.Groups[2].Value;
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str = date + " " + DateTime.Now.Year + " " + time;
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}
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return FromFuzzyTime(str, format);
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}
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catch (Exception ex)
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{
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throw new Exception($"DateTime parsing failed for \"{str}\": {ex}");
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}
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}
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// converts a date/time string to a DateTime object using a GoLang layout
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public static DateTime ParseDateTimeGoLang(string date, string layout)
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{
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date = ParseUtil.NormalizeSpace(date);
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var pattern = layout;
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// year
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pattern = pattern.Replace("2006", "yyyy");
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pattern = pattern.Replace("06", "yy");
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// month
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pattern = pattern.Replace("January", "MMMM");
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pattern = pattern.Replace("Jan", "MMM");
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pattern = pattern.Replace("01", "MM");
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// day
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pattern = pattern.Replace("Monday", "dddd");
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pattern = pattern.Replace("Mon", "ddd");
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pattern = pattern.Replace("02", "dd");
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pattern = pattern.Replace("2", "d");
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// hours/minutes/seconds
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pattern = pattern.Replace("05", "ss");
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pattern = pattern.Replace("15", "HH");
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pattern = pattern.Replace("03", "hh");
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pattern = pattern.Replace("3", "h");
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pattern = pattern.Replace("04", "mm");
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pattern = pattern.Replace("4", "m");
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pattern = pattern.Replace("5", "s");
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// month again
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pattern = pattern.Replace("1", "M");
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// fractional seconds
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pattern = pattern.Replace(".0000", "ffff");
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pattern = pattern.Replace(".000", "fff");
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pattern = pattern.Replace(".00", "ff");
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pattern = pattern.Replace(".0", "f");
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pattern = pattern.Replace(".9999", "FFFF");
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pattern = pattern.Replace(".999", "FFF");
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pattern = pattern.Replace(".99", "FF");
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pattern = pattern.Replace(".9", "F");
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// AM/PM
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pattern = pattern.Replace("PM", "tt");
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pattern = pattern.Replace("pm", "tt"); // not sure if this works
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// timezones
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// these might need further tuning
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pattern = pattern.Replace("Z07:00", "'Z'zzz");
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pattern = pattern.Replace("Z07", "'Z'zz");
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pattern = pattern.Replace("Z07:00", "'Z'zzz");
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pattern = pattern.Replace("Z07", "'Z'zz");
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pattern = pattern.Replace("-07:00", "zzz");
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pattern = pattern.Replace("-07", "zz");
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try
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{
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return DateTime.ParseExact(date, pattern, CultureInfo.InvariantCulture);
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}
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catch (FormatException ex)
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{
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throw new FormatException($"Error while parsing DateTime \"{date}\", using layout \"{layout}\" ({pattern}): {ex.Message}");
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}
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}
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private static TimeSpan ParseTimeSpan(string time) =>
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string.IsNullOrWhiteSpace(time)
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? TimeSpan.Zero
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: DateTime.Parse(time).TimeOfDay;
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}
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}
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