public override string ToString()
{
var abbreviation = DatumHelpers.isQuote(First);
if (abbreviation != null)
{
var quoted = Second as Pair;
if (quoted != null)
{
return(string.Format("{0}{1}", abbreviation, quoted.First));
}
}
var writer = new Writer();
Pair tail;
Datum next = this;
while ((tail = asPair(next)) != null)
{
writer.Write(tail.First);
next = tail.Second;
}
if (next != Null.Instance)
{
writer.Write(".");
writer.Write(next);
}
return(writer.GetString());
}
public static object CastObject(this Datum d)
{
return(DatumHelpers.castObject(d));
}
public static int CastInt(this Datum d)
{
return(DatumHelpers.castInt(d));
}
public static string CastString(this Datum d)
{
return(DatumHelpers.castString(d));
}
public static Symbol CastSymbol(this Datum d)
{
return(DatumHelpers.castSymbol(d));
}
public static Symbol ToSymbol(this string identifier)
{
return(DatumHelpers.symbol(identifier));
}
public static Datum ToAtom(this object o)
{
return(DatumHelpers.atom(o));
}
public static Datum ToList(this IEnumerable <Datum> datums)
{
return(DatumHelpers.compound(datums.ToArray()));
}
public static IEnumerable <Datum> Enumerate(this Datum list)
{
return(DatumHelpers.enumerate(list));
}
public static string CastIdentifier(this Datum d)
{
return DatumHelpers.getIdentifier(d);
}