115 lines
4.4 KiB
C#
115 lines
4.4 KiB
C#
#region Disclaimer / License
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// Copyright (C) 2011, Kenneth Skovhede
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// http://www.hexad.dk, opensource@hexad.dk
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Duplicati.Library.Utility
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{
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/// <summary>
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/// Utility class to parse date/time offset strings like duplicity does:
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/// http://www.nongnu.org/duplicity/duplicity.1.html#sect7
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/// </summary>
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public static class Timeparser
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{
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public static TimeSpan ParseTimeSpan(string datestring)
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{
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DateTime dt = new DateTime(0, DateTimeKind.Local);
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return ParseTimeInterval(datestring, dt) - dt;
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}
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public static DateTime ParseTimeInterval(string datestring, DateTime offset)
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{
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return ParseTimeInterval(datestring, offset, false);
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}
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public static DateTime ParseTimeInterval(string datestring, DateTime offset, bool negate)
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{
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if (offset.Kind == DateTimeKind.Unspecified)
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offset = new DateTime(offset.Ticks, DateTimeKind.Local);
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int multiplier = negate ? -1 : 1;
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if (string.IsNullOrEmpty(datestring))
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return offset;
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if (datestring.Trim().ToLower() == "now")
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return DateTime.Now;
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long l;
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if (long.TryParse(datestring, System.Globalization.NumberStyles.Integer, null, out l))
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return offset.AddSeconds(l * multiplier);
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DateTime t;
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if (DateTime.TryParse(datestring, System.Globalization.CultureInfo.CurrentUICulture, System.Globalization.DateTimeStyles.AssumeLocal, out t))
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return t;
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char[] separators = new char[] { 's', 'm', 'h', 'D', 'W', 'M', 'Y' };
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int index = 0;
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int previndex = 0;
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while ((index = datestring.IndexOfAny(separators, previndex)) > 0)
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{
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string partial = datestring.Substring(previndex, index - previndex).Trim();
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int factor;
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if (!int.TryParse(partial, System.Globalization.NumberStyles.Integer, null, out factor))
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throw new Exception(string.Format(Strings.Timeparser.InvalidIntegerError, partial));
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factor *= multiplier;
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switch (datestring[index])
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{
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case 's':
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offset = offset.AddSeconds(factor);
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break;
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case 'm':
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offset = offset.AddMinutes(factor);
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break;
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case 'h':
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offset = offset.AddHours(factor);
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break;
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case 'D':
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offset = offset.AddDays(factor);
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break;
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case 'W':
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offset = offset.AddDays(factor * 7);
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break;
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case 'M':
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offset = offset.AddMonths(factor);
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break;
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case 'Y':
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offset = offset.AddYears(factor);
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break;
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default:
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throw new Exception(string.Format(Strings.Timeparser.InvalidSpecifierError, datestring[index]));
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}
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previndex = index + 1;
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}
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if (datestring.Substring(previndex).Trim().Length > 0)
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throw new Exception(string.Format(Strings.Timeparser.UnparsedDataFragmentError, datestring.Substring(previndex)));
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return offset;
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}
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}
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}
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