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467 lines
18 KiB
467 lines
18 KiB
//********************************************************************************************
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//Author: Sergey Stoyan, CliverSoft.com
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// http://cliversoft.com
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// stoyan@cliversoft.com
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// sergey.stoyan@gmail.com
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// 27 February 2007
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//********************************************************************************************
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using System;
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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 DateTimeRoutines
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{
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public class ParsedDateTime
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{
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public readonly int IndexOfDate = -1;
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public readonly int LengthOfDate = -1;
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public readonly int IndexOfTime = -1;
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public readonly int LengthOfTime = -1;
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public readonly DateTime DateTime;
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public readonly bool IsDateFound;
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public readonly bool IsTimeFound;
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public readonly TimeSpan UtcOffset;
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public readonly bool IsUtcOffsetFound;
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public DateTime UtcDateTime;
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internal ParsedDateTime(int index_of_date, int length_of_date, int index_of_time, int length_of_time, DateTime date_time)
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{
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IndexOfDate = index_of_date;
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LengthOfDate = length_of_date;
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IndexOfTime = index_of_time;
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LengthOfTime = length_of_time;
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DateTime = date_time;
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IsDateFound = index_of_date > -1;
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IsTimeFound = index_of_time > -1;
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UtcOffset = new TimeSpan(25, 0, 0);
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IsUtcOffsetFound = false;
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UtcDateTime = new DateTime(1, 1, 1);
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}
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internal ParsedDateTime(int index_of_date, int length_of_date, int index_of_time, int length_of_time, DateTime date_time, TimeSpan utc_offset)
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{
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IndexOfDate = index_of_date;
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LengthOfDate = length_of_date;
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IndexOfTime = index_of_time;
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LengthOfTime = length_of_time;
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DateTime = date_time;
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IsDateFound = index_of_date > -1;
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IsTimeFound = index_of_time > -1;
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UtcOffset = utc_offset;
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IsUtcOffsetFound = Math.Abs(utc_offset.TotalHours) < 12;
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if (!IsUtcOffsetFound)
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{
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UtcDateTime = new DateTime(1, 1, 1);
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}
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else
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{
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if (index_of_date < 0)
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{
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//to avoid negative date exception when date is undefined
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var ts = date_time.TimeOfDay + utc_offset;
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if (ts < new TimeSpan(0))
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{
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UtcDateTime = new DateTime(1, 1, 2) + ts;
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}
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else
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{
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UtcDateTime = new DateTime(1, 1, 1) + ts;
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}
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}
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else
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{
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UtcDateTime = date_time + utc_offset;
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}
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}
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}
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}
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public static DateTime DefaultDate
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{
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get
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{
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if (DefaultDateIsNow)
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{
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return DateTime.Now;
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}
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else
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{
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return _DefaultDate;
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}
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}
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set
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{
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_DefaultDate = value;
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DefaultDateIsNow = false;
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}
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}
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private static DateTime _DefaultDate = DateTime.Now;
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public static bool DefaultDateIsNow = true;
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public enum DateTimeFormat
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{
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USDate,
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UKDate,
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}
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public static bool TryParseDateOrTime(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_date_time)
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{
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parsed_date_time = null;
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ParsedDateTime parsed_date;
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ParsedDateTime parsed_time;
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if (!TryParseDate(str, default_format, out parsed_date))
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{
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if (!TryParseTime(str, default_format, out parsed_time, null))
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{
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return false;
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}
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var date_time = new DateTime(DefaultDate.Year, DefaultDate.Month, DefaultDate.Day, parsed_time.DateTime.Hour, parsed_time.DateTime.Minute, parsed_time.DateTime.Second);
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parsed_date_time = new ParsedDateTime(-1, -1, parsed_time.IndexOfTime, parsed_time.LengthOfTime, date_time, parsed_time.UtcOffset);
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}
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else
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{
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if (!TryParseTime(str, default_format, out parsed_time, parsed_date))
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{
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var date_time = new DateTime(parsed_date.DateTime.Year, parsed_date.DateTime.Month, parsed_date.DateTime.Day, 0, 0, 0);
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parsed_date_time = new ParsedDateTime(parsed_date.IndexOfDate, parsed_date.LengthOfDate, -1, -1, date_time);
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}
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else
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{
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var date_time = new DateTime(parsed_date.DateTime.Year, parsed_date.DateTime.Month, parsed_date.DateTime.Day, parsed_time.DateTime.Hour, parsed_time.DateTime.Minute, parsed_time.DateTime.Second);
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parsed_date_time = new ParsedDateTime(parsed_date.IndexOfDate, parsed_date.LengthOfDate, parsed_time.IndexOfTime, parsed_time.LengthOfTime, date_time, parsed_time.UtcOffset);
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}
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}
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return true;
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}
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public static bool TryParseTime(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_time, ParsedDateTime parsed_date)
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{
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parsed_time = null;
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string time_zone_r;
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if (default_format == DateTimeFormat.USDate)
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{
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time_zone_r = @"(?:\s*(?'time_zone'UTC|GMT|CST|EST))?";
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}
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else
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{
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time_zone_r = @"(?:\s*(?'time_zone'UTC|GMT))?";
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}
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Match m;
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if (parsed_date != null && parsed_date.IndexOfDate > -1)
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{
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//look around the found date
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//look for <date> hh:mm:ss <UTC offset>
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m = Regex.Match(str.Substring(parsed_date.IndexOfDate + parsed_date.LengthOfDate), @"(?<=^\s*,?\s+|^\s*at\s*|^\s*[T\-]\s*)(?'hour'\d{2})\s*:\s*(?'minute'\d{2})\s*:\s*(?'second'\d{2})\s+(?'offset_sign'[\+\-])(?'offset_hh'\d{2}):?(?'offset_mm'\d{2})(?=$|[^\d\w])", RegexOptions.Compiled);
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if (!m.Success)
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{
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//look for <date> [h]h:mm[:ss] [PM/AM] [UTC/GMT]
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m = Regex.Match(str.Substring(parsed_date.IndexOfDate + parsed_date.LengthOfDate), @"(?<=^\s*,?\s+|^\s*at\s*|^\s*[T\-]\s*)(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[^\d\w])", RegexOptions.Compiled);
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}
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if (!m.Success)
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{
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//look for [h]h:mm:ss [PM/AM] [UTC/GMT] <date>
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m = Regex.Match(str.Substring(0, parsed_date.IndexOfDate), @"(?<=^|[^\d])(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[\s,]+)", RegexOptions.Compiled);
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}
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if (!m.Success)
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{
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//look for [h]h:mm:ss [PM/AM] [UTC/GMT] within <date>
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m = Regex.Match(str.Substring(parsed_date.IndexOfDate, parsed_date.LengthOfDate), @"(?<=^|[^\d])(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[\s,]+)", RegexOptions.Compiled);
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}
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}
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else
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{
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//look anywhere within string
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//look for hh:mm:ss <UTC offset>
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m = Regex.Match(str, @"(?<=^|\s+|\s*T\s*)(?'hour'\d{2})\s*:\s*(?'minute'\d{2})\s*:\s*(?'second'\d{2})\s+(?'offset_sign'[\+\-])(?'offset_hh'\d{2}):?(?'offset_mm'\d{2})?(?=$|[^\d\w])", RegexOptions.Compiled);
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if (!m.Success)
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{
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//look for [h]h:mm[:ss] [PM/AM] [UTC/GMT]
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m = Regex.Match(str, @"(?<=^|\s+|\s*T\s*)(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[^\d\w])", RegexOptions.Compiled);
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}
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}
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if (!m.Success)
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{
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return false;
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}
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//try
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//{
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var hour = int.Parse(m.Groups["hour"].Value);
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if (hour < 0 || hour > 23)
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{
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return false;
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}
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var minute = int.Parse(m.Groups["minute"].Value);
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if (minute < 0 || minute > 59)
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{
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return false;
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}
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var second = 0;
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if (!string.IsNullOrEmpty(m.Groups["second"].Value))
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{
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second = int.Parse(m.Groups["second"].Value);
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if (second < 0 || second > 59)
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{
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return false;
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}
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}
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if (string.Equals(m.Groups["ampm"].Value, "PM", StringComparison.InvariantCultureIgnoreCase) && hour < 12)
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{
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hour += 12;
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}
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else if (string.Equals(m.Groups["ampm"].Value, "AM", StringComparison.InvariantCultureIgnoreCase) && hour == 12)
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{
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hour -= 12;
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}
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var date_time = new DateTime(1, 1, 1, hour, minute, second);
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if (m.Groups["offset_hh"].Success)
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{
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var offset_hh = int.Parse(m.Groups["offset_hh"].Value);
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var offset_mm = 0;
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if (m.Groups["offset_mm"].Success)
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{
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offset_mm = int.Parse(m.Groups["offset_mm"].Value);
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}
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var utc_offset = new TimeSpan(offset_hh, offset_mm, 0);
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if (m.Groups["offset_sign"].Value == "-")
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{
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utc_offset = -utc_offset;
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}
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parsed_time = new ParsedDateTime(-1, -1, m.Index, m.Length, date_time, utc_offset);
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return true;
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}
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if (m.Groups["time_zone"].Success)
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{
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TimeSpan utc_offset;
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switch (m.Groups["time_zone"].Value)
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{
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case "UTC":
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case "GMT":
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utc_offset = new TimeSpan(0, 0, 0);
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break;
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case "CST":
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utc_offset = new TimeSpan(-6, 0, 0);
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break;
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case "EST":
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utc_offset = new TimeSpan(-5, 0, 0);
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break;
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default:
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throw new Exception("Time zone: " + m.Groups["time_zone"].Value + " is not defined.");
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}
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parsed_time = new ParsedDateTime(-1, -1, m.Index, m.Length, date_time, utc_offset);
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return true;
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}
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parsed_time = new ParsedDateTime(-1, -1, m.Index, m.Length, date_time);
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return true;
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}
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public static bool TryParseDate(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_date)
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{
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parsed_date = null;
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if (string.IsNullOrEmpty(str))
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{
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return false;
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}
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//look for dd/mm/yy
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var m = Regex.Match(str, @"(?<=^|[^\d])(?'day'\d{1,2})\s*(?'separator'[\\/\.])+\s*(?'month'\d{1,2})\s*\'separator'+\s*(?'year'\d{2}|\d{4})(?=$|[^\d])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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if (m.Success)
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{
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DateTime date;
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if ((default_format ^ DateTimeFormat.USDate) == DateTimeFormat.USDate)
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{
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if (!ConvertToDate(int.Parse(m.Groups["year"].Value), int.Parse(m.Groups["day"].Value), int.Parse(m.Groups["month"].Value), out date))
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{
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return false;
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}
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}
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else
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{
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if (!ConvertToDate(int.Parse(m.Groups["year"].Value), int.Parse(m.Groups["month"].Value), int.Parse(m.Groups["day"].Value), out date))
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{
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return false;
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}
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}
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parsed_date = new ParsedDateTime(m.Index, m.Length, -1, -1, date);
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return true;
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}
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//look for [yy]yy-mm-dd
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m = Regex.Match(str, @"(?<=^|[^\d])(?'year'\d{2}|\d{4})\s*(?'separator'[\-])\s*(?'month'\d{1,2})\s*\'separator'+\s*(?'day'\d{1,2})(?=$|[^\d])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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if (m.Success)
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{
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DateTime date;
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if (!ConvertToDate(int.Parse(m.Groups["year"].Value), int.Parse(m.Groups["month"].Value), int.Parse(m.Groups["day"].Value), out date))
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{
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return false;
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}
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parsed_date = new ParsedDateTime(m.Index, m.Length, -1, -1, date);
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return true;
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}
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//look for month dd yyyy
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m = Regex.Match(str, @"(?:^|[^\d\w])(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})(?:-?st|-?th|-?rd|-?nd)?\s*,?\s*(?'year'\d{4})(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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if (!m.Success)
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{
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//look for dd month [yy]yy
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m = Regex.Match(str, @"(?:^|[^\d\w:])(?'day'\d{1,2})(?:-?st\s+|-?th\s+|-?rd\s+|-?nd\s+|-|\s+)(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*(?:\s*,?\s*|-)'?(?'year'\d{2}|\d{4})(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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}
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if (!m.Success)
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{
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//look for yyyy month dd
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m = Regex.Match(str, @"(?:^|[^\d\w])(?'year'\d{4})\s+(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})(?:-?st|-?th|-?rd|-?nd)?(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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}
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if (!m.Success)
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{
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//look for month dd hh:mm:ss MDT|UTC yyyy
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m = Regex.Match(str, @"(?:^|[^\d\w])(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})\s+\d{2}\:\d{2}\:\d{2}\s+(?:MDT|UTC)\s+(?'year'\d{4})(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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}
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if (!m.Success)
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{
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//look for month dd [yyyy]
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m = Regex.Match(str, @"(?:^|[^\d\w])(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})(?:-?st|-?th|-?rd|-?nd)?(?:\s*,?\s*(?'year'\d{4}))?(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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}
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if (m.Success)
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{
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var month = -1;
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var index_of_date = m.Index;
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var length_of_date = m.Length;
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switch (m.Groups["month"].Value)
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{
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case "Jan":
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case "JAN":
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month = 1;
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break;
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case "Feb":
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case "FEB":
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month = 2;
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break;
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case "Mar":
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case "MAR":
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month = 3;
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break;
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case "Apr":
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case "APR":
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month = 4;
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break;
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case "May":
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case "MAY":
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month = 5;
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break;
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case "Jun":
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case "JUN":
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month = 6;
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break;
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case "Jul":
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month = 7;
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break;
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case "Aug":
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case "AUG":
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month = 8;
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break;
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case "Sep":
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case "SEP":
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month = 9;
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break;
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case "Oct":
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case "OCT":
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month = 10;
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break;
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case "Nov":
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case "NOV":
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month = 11;
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break;
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case "Dec":
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case "DEC":
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month = 12;
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break;
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}
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int year;
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if (!string.IsNullOrEmpty(m.Groups["year"].Value))
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{
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year = int.Parse(m.Groups["year"].Value);
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}
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else
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{
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year = DefaultDate.Year;
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}
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DateTime date;
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if (!ConvertToDate(year, month, int.Parse(m.Groups["day"].Value), out date))
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{
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return false;
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}
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parsed_date = new ParsedDateTime(index_of_date, length_of_date, -1, -1, date);
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return true;
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}
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return false;
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}
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private static bool ConvertToDate(int year, int month, int day, out DateTime date)
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{
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if (year >= 100)
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{
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if (year < 1000)
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{
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date = new DateTime(1, 1, 1);
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return false;
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}
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}
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else
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if (year > 30)
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{
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year += 1900;
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}
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else
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{
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year += 2000;
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}
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try
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{
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date = new DateTime(year, month, day);
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}
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catch
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{
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date = new DateTime(1, 1, 1);
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return false;
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}
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return true;
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}
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}
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}
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