// this will scan the longest valid regular entry
public static IIdentifierLiteral Scan(TextInputRange input)
{
if (!IsStart(input))
{
input.Backtrack(); // dot might have been skipped
return(null);
}
do
{
input.Extend();
} while (IsContinue(input));
return(new IdentifierLiteral {
Content = input.Text, Range = input.Clone()
});
}