// tries to parse a string with a relative time specification
private static DateTime?Parse_relative(string dateStr, JavaCalendar now)
{
JavaCalendar cal;
SystemReader sysRead = SystemReader.GetInstance();
// check for the static words "yesterday" or "now"
if ("now".Equals(dateStr))
{
return((now == null) ? Sharpen.Extensions.CreateDate(sysRead.GetCurrentTime()) :
now.GetTime());
}
if (now == null)
{
cal = new JavaGregorianCalendar(sysRead.GetTimeZone(), sysRead.GetLocale());
cal.SetTimeInMillis(sysRead.GetCurrentTime());
}
else
{
cal = (JavaCalendar)now.Clone();
}
if ("yesterday".Equals(dateStr))
{
cal.Add(JavaCalendar.DATE, -1);
cal.Set(JavaCalendar.HOUR_OF_DAY, 0);
cal.Set(JavaCalendar.MINUTE, 0);
cal.Set(JavaCalendar.SECOND, 0);
cal.Set(JavaCalendar.MILLISECOND, 0);
cal.Set(JavaCalendar.MILLISECOND, 0);
return(cal.GetTime());
}
// parse constructs like "3 days ago", "5.week.2.day.ago"
string[] parts = dateStr.RegexSplit("\\.| ");
int partsLength = parts.Length;
// check we have an odd number of parts (at least 3) and that the last
// part is "ago"
if (partsLength < 3 || (partsLength & 1) == 0 || !"ago".Equals(parts[parts.Length
- 1]))
{
return(null);
}
int number;
for (int i = 0; i < parts.Length - 2; i += 2)
{
try
{
number = System.Convert.ToInt32(parts[i]);
}
catch (FormatException)
{
return(null);
}
if ("year".Equals(parts[i + 1]) || "years".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.YEAR, -number);
}
else
{
if ("month".Equals(parts[i + 1]) || "months".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.MONTH, -number);
}
else
{
if ("week".Equals(parts[i + 1]) || "weeks".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.WEEK_OF_YEAR, -number);
}
else
{
if ("day".Equals(parts[i + 1]) || "days".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.DATE, -number);
}
else
{
if ("hour".Equals(parts[i + 1]) || "hours".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.HOUR_OF_DAY, -number);
}
else
{
if ("minute".Equals(parts[i + 1]) || "minutes".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.MINUTE, -number);
}
else
{
if ("second".Equals(parts[i + 1]) || "seconds".Equals(parts[i + 1]))
{
cal.Add(JavaCalendar.SECOND, -number);
}
else
{
return(null);
}
}
}
}
}
}
}
}
return(cal.GetTime());
}