private string PreivewDate(ISourceStream source)
{
source.IsDigit(4);
source.IsChar('-');
source.IsDigit(1, 2);
source.IsChar('-');
source.IsDigit(1, 2);
return(source.PreviewString());
}
private string PreviewZone(ISourceStream source, int index)
{
source.PreviewPosition++;
source.IsDigit(1, 2);
source.IsChar(':');
source.IsDigit(1, 2);
return(source.PreviewString(index));
}
private string PreivewTime(ISourceStream source, int index = -1)
{
source.IsDigit(1, 2);
source.IsChar(':');
source.IsDigit(1, 2);
source.IsChar(':');
source.IsDigit(1, 2);
if (source.PreviewChar == '.')
{
source.PreviewPosition++;
source.IsDigit(1, 12);
}
if (index > -1)
{
return(source.PreviewString(index));
}
return(source.PreviewString());
}
public override Token TryMatch(ParsingContext context, ISourceStream source)
{
try
{
var text = source.Text;
switch (_Kind)
{
case EDateTimeKind.Date:
return(source.CreateToken(this.OutputTerminal, DateTime.Parse(PreivewDate(source))));
case EDateTimeKind.TimeOfDay:
return(source.CreateToken(this.OutputTerminal, DateTime.Parse(PreivewTime(source))));
case EDateTimeKind.DateTime:
{
var date = PreivewDate(source);
source.IsChar('T');
var time = PreivewTime(source, source.PreviewPosition);
return(source.CreateToken(this.OutputTerminal, DateTime.Parse(date + " " + time)));
}
case EDateTimeKind.DateTimeOffset:
{
var date = PreivewDate(source);
source.IsChar('T');
var time = PreivewTime(source, source.PreviewPosition);
if (source.PreviewChar == '+' || source.PreviewChar == '-')
{
var zone = PreviewZone(source, source.PreviewPosition);
return(source.CreateToken(this.OutputTerminal, DateTime.Parse(date + " " + time + " " + zone)));
}
else
{
source.IsChar('Z');
}
return(source.CreateToken(this.OutputTerminal, DateTime.Parse(date + " " + time)));
}
case EDateTimeKind.TimeSpan:
{
var multi = source.PreviewChar == '-' ? -1 : 1;
if (source.PreviewChar == '+')
{
source.Position++;
}
source.IsChar('P');
var day = PreviewDigit(source);
source.IsChar('D');
var space = TimeSpan.FromDays(Convert.ToDouble(day) * multi);
if (source.PreviewChar == 'T')
{
source.PreviewPosition++;
var iscontinue = true;
do
{
var val = PreviewDigit(source);
switch (source.PreviewChar)
{
case 'H':
space += TimeSpan.FromHours(Convert.ToDouble(val) * multi);
break;
case 'M':
space += TimeSpan.FromMinutes(Convert.ToDouble(val) * multi);
break;
case 'S':
space += TimeSpan.FromSeconds(Convert.ToDouble(val) * multi);
break;
default:
iscontinue = false;
break;
}
if (iscontinue)
{
source.PreviewPosition++;
}
} while (iscontinue && Char.IsDigit(source.PreviewChar));
}
return(source.CreateToken(this.OutputTerminal, space));
}
default:
return(context.CreateErrorToken("not suppored datetimekind."));
}
}
catch (Exception ex)
{
return(null);
}
}