public void ReadImpliedRelativeTimeSpan(ref DateTime baseTime, NumberToken num, TimeUnitToken units)
{
var number = num.Value;
if (_tokeniser.ContainsToken <RelativeToken>(c => c.RelativeType == RelativeType.Ago))
{
number *= -1;
}
try
{
baseTime = units.Unit switch
{
TimeUnit.Day => baseTime.AddDays(number),
TimeUnit.Month => baseTime.AddMonths(number),
TimeUnit.Week => baseTime.AddDays(7 * number),
TimeUnit.Year => baseTime.AddYears(number),
TimeUnit.Minute => baseTime.AddMinutes(number),
TimeUnit.Second => baseTime.AddSeconds(number),
TimeUnit.Hour => baseTime.AddHours(number),
TimeUnit.Millisecond => baseTime.AddMilliseconds(number),
_ => throw new ParseException(ParseFailReason.InvalidUnit, $"Invalid unit following '{num.Value}'.")
};
} catch (ArgumentOutOfRangeException)
{
throw new ParseException(ParseFailReason.InvalidUnit, "Cannot add that much time to the current date.");
}
}
public void ReadRelativeDayTime(ref DateTime date, NumberToken firstNumberToken, TriviaToken specifierToken)
{
var hours = firstNumberToken.Value;
var minutes = 0;
var seconds = 0;
switch (specifierToken.TriviaType)
{
case TriviaType.Am:
if (hours == 12)
{
hours = 0; // 12 AM == 0000 hours
}
break;
case TriviaType.Pm:
if (hours != 12)
{
hours += 12; // 12 PM = 1200 hours
}
break;
case TriviaType.Colon:
if (!_tokeniser.MoveNext())
{
throw new ParseException(ParseFailReason.NumberExpected, $"Expected a minute specifier to follow after a colon.");
}
if (!(_tokeniser.Current is NumberToken num))
{
throw new ParseException(ParseFailReason.InvalidUnit, $"Expected a number to follow the colon.");
}
minutes = num.Value;
if (_tokeniser.PeekNext() != null && _tokeniser.PeekNext() is TriviaToken t && t.TriviaType == TriviaType.Colon)
{
_tokeniser.MoveNext();
if (!_tokeniser.MoveNext())
{
throw new ParseException(ParseFailReason.NumberExpected, $"Expected a second specifier to follow the colon.");
}
if (!(_tokeniser.Current is NumberToken msNum))
{
throw new ParseException(ParseFailReason.InvalidUnit, "Expected a number to follow the colon.");
}
seconds = msNum.Value;
}
if (!_tokeniser.MoveNext() || !(_tokeniser.Current is TriviaToken t0))
{
throw new ParseException(ParseFailReason.UnitExpected, "Expected an AM or PM specifier.");
}
switch (t0.TriviaType)
{
case TriviaType.Am:
if (hours == 12)
{
hours = 0; // 12 AM == 0000 hours
}
break;
case TriviaType.Pm:
if (hours != 12)
{
hours += 12; // 12 PM = 1200 hours
}
break;
default:
throw new ParseException(ParseFailReason.InvalidUnit, $"Invalid unit '{t0.TriviaType.ToString()}', expected AM or PM.");
}
break;
default:
throw new ParseException(ParseFailReason.InvalidUnit, $"Invalid unit '{specifierToken.TriviaType.ToString()}', expected AM or PM.");
}
if (hours >= 24 || minutes >= 60 || seconds >= 60)
{
throw new ParseException(ParseFailReason.InvalidUnit, $"Not a valid time.");
}
date = new DateTime(date.Year, date.Month, date.Day, hours, minutes, seconds);
}