public static WholeNumberPart Produce(IEnumerable <Symbol> symbols,
out IEnumerable <Symbol> symbolsToProcess)
{
// whole-number-part = digit-sequence
IEnumerable <Symbol> s = null;
DigitSequence d = DigitSequence.Produce(symbols, out s);
if (d != null)
{
symbolsToProcess = s;
return(new WholeNumberPart(d));
}
symbolsToProcess = null;
return(null);
}
public static FractionalPart Produce(IEnumerable <Symbol> symbols)
{
// fractional-part = full-stop digit-sequence
if (!symbols.Any())
{
return(null);
}
if (symbols.First() is FullStop)
{
IEnumerable <Symbol> s = null;
DigitSequence d = DigitSequence.Produce(symbols.Skip(1), out s);
if (d == null || s.Any())
{
return(null);
}
return(new FractionalPart(new FullStop(), d));
}
return(null);
}