/// <summary>
/// Divide by x, return self
/// </summary>
// public abstract LispNumber Divide(LispNumber x);
// public abstract int Compare(LispNumber x);
public static SchNum Add(SchNum x, SchNum y)
{
if (object.ReferenceEquals(y, null) || y.isZero)
{
return(x);
}
var xType = x.valueType;
var yType = y.valueType;
if (ValueType.Double == xType || ValueType.Double == yType)
{
return(new SchDouble(x.AsDouble() + y.AsDouble()));
}
else if (ValueType.Single == xType || ValueType.Single == yType)
{
return(new SchFloat(x.AsFloat() + y.AsFloat()));
}
else if (ValueType.UInt64 == xType || ValueType.UInt64 == yType)
{
return(new SchUInt64(x.AsULong() + y.AsULong()));
}
else if (ValueType.Int64 == xType || ValueType.Int64 == yType)
{
return(new SchInt64(x.AsLong() + y.AsLong()));
}
else if (ValueType.UInt32 == xType || ValueType.UInt32 == yType)
{
return(new SchUInt(x.AsUInt() + y.AsUInt()));
}
return(new SchInt(x.AsInt() + y.AsInt()));
}
/// <summary>
/// Numbers become numbers; #t and #f are booleans; "..." string; otherwise Symbol.
/// </summary>
private object ParseAtom(string token)
{
if (token == "#t")
{
// Do we really need boolean?
// return new SchBool(true);
return(new SchInt(1));
}
else if (token == "#f")
{
// return new SchBool(false);
return(new SchInt(0));
}
else if (token[0] == '"')
{
return(token.Substring(1, token.Length - 2));
}
else if (SchNum.TryParse(token, out SchObj num))
{
return(num);
}
else
{
return(Intern(token)); // a symbol
}
}
/// <summary> /// Subtract x from self, return self /// </summary> public abstract SchNum Subtract(SchNum x);
/// <summary> /// Multiply by x , return self /// </summary> public abstract SchNum Multiply(SchNum x);
public override SchNum Subtract(SchNum x)
{
return(null);
}
public override SchNum Multiply(SchNum x)
{
return(null);
}
public override SchNum Add(SchNum x)
{
return(null);
}
/// <summary> /// Add x to self, return self /// </summary> public abstract SchNum Add(SchNum x);
public static int Compare(SchNum x, SchNum y)
{
return(System.Math.Sign(x.AsDouble() - y.AsDouble()));
}
public static SchNum Floor(SchNum x)
{
return(x);
}
public static SchNum Ceiling(SchNum x)
{
return(x);
}