public override string DisplayObject()
{
StringBuilder repr = new StringBuilder("(");
repr.Append(DisplayValue());
CTObject tail = cdr;
while (true)
{
if (tail.GetType() == typeof(CTPair))
{
CTPair rest = (CTPair)tail;
repr.Append(" ").Append(rest.DisplayValue());
tail = rest.cdr;
}
else
{
if (tail.GetType() != typeof(CTEmptyList))
{
repr.Append(" . ").Append(tail.DisplayObject());
}
break;
}
}
repr.Append(")");
return(repr.ToString());
}
protected override bool IsEqualTo(CTObject obj)
{
if (obj.GetType() == typeof(CTPair))
{
CTPair other = (CTPair)obj;
return(other.car.Equals(car) && other.cdr.Equals(cdr));
}
else
{
return(false);
}
}
public static CTObject Map(CTObject[] args)
{
AssertParameterCountAtLeast(MapFunctionName, 2, args);
CTProcedure proc = args[0] as CTProcedure;
if (proc == null)
{
throw new TypeError(MapFunctionName, CTProcedure.TypeName, args[0].DisplayType());
}
for (int i = 1; i < args.Length; ++i)
{
if (args[i].GetType() != typeof(CTPair))
{
throw new TypeError(MapFunctionName, CTPair.TypeName, args[i].DisplayType());
}
}
List <CTObject> results = new List <CTObject>();
CTObject[] applyArgs = new CTObject[args.Length - 1];
bool firstListEnded = false;
while (!firstListEnded)
{
for (int i = 1; i < args.Length; ++i)
{
if (args[i].GetType() == typeof(CTEmptyList))
{
firstListEnded = true;
break;
}
else if (args[i].GetType() == typeof(CTPair))
{
CTPair arg = (CTPair)args[i];
applyArgs[i - 1] = arg.car;
args[i] = arg.cdr;
}
else
{
throw new TypeError(MapFunctionName, CTPair.TypeName, args[i].DisplayType());
}
}
if (!firstListEnded)
{
results.Add(Apply(proc, applyArgs));
}
}
return(List(results));
}