internal bool TryParse(string str, out DateTimeInterval interval)
{
interval = default(DateTimeInterval);
if (str == null)
{
this.error = ParseError.ArgumentNull;
return(false);
}
if (str.Length == 0)
{
this.error = ParseError.Format;
return(false);
}
IList <Token> tokens;
var tokenizer = new Tokenizer(str);
try
{
tokens = tokenizer.Tokenize();
}
catch (FormatException)
{
this.error = ParseError.Format;
return(false);
}
catch (OverflowException)
{
this.error = ParseError.Overflow;
return(false);
}
catch (ArgumentOutOfRangeException)
{
this.error = ParseError.ArgumentOutOfRange;
return(false);
}
if (tokens.Count == 0 || tokens.Count > 2)
{
this.error = ParseError.Format;
return(false);
}
int hours = 0;
int days = 0;
int months = 0;
int weeks = 0;
foreach (Token token in tokens)
{
if (token is HourToken)
{
hours = token.Value;
}
if (token is DayToken)
{
days = token.Value;
}
else if (token is MonthToken)
{
months = token.Value;
}
else if (token is WeekToken)
{
weeks = token.Value;
}
}
interval = new DateTimeInterval(hours, days, months, weeks);
return(true);
}
/// <summary>
/// Subtracts the interval.
/// </summary>
/// <param name="dateSpan">The date span.</param>
/// <param name="dateTimeInterval">The date time interval.</param>
/// <returns></returns>
public static TimeSlot SubtractInterval(this IDateSpan dateSpan, DateTimeInterval dateTimeInterval)
{
return(new TimeSlot(
dateSpan.Start.AddDays(-dateTimeInterval.Days).AddMonths(-dateTimeInterval.Months),
dateSpan.End.AddDays(-dateTimeInterval.Days).AddMonths(-dateTimeInterval.Months)));
}
