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());
}
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 PreviewDigit(ISourceStream source)
{
var index = source.PreviewPosition;
var startIndex = index;
var text = source.Text;
if (!char.IsDigit(text[index++]))
{
throw new InvalidCastException();
}
while (char.IsDigit(text[index]) || text[index] == '.')
{
index++;
}
source.PreviewPosition = index;
return(source.PreviewString(startIndex));
}
public override Token TryMatch(ParsingContext context, ISourceStream source)
{
if (!IsValid(source.PreviewChar))
{
return(null);
}
source.PreviewPosition++;
do
{
var current = source.PreviewChar;
if (!IsValid(source.PreviewChar))
{
break;
}
source.PreviewPosition++;
}while (!source.EOF());
var value = source.PreviewString();
return(source.CreateToken(this.OutputTerminal, value));
}