public IType Evaluate(Scope scope)
{
IType t = target;
if (target is IUnevaluated utarget)
{
t = utarget.Evaluate(scope);
}
if (t is Union union)
{
return(union.Apply(x => new UnaryOperatorExpression(pre, x)));
}
if (t is IUnevaluated)
{
return(new BakedExpression(new UnaryOperatorExpression(pre, t), scope));
}
if (t is Error)
{
return(t);
}
// Operate
if (t is IOperable oper)
{
if (oper.UnaryOperators != null && oper.UnaryOperators.TryGetValue(pre, out var action))
{
IType ret = action.Invoke();
if (ret == null)
{
return(new Error("WrongType", $"The {pre.ToDisplayString()} operator cannot be applied to type {t.TypeName}"));
}
return(ret);
}
}
return(new Error("WrongType", $"The {pre.ToDisplayString()} operator cannot be applied to type {t.TypeName}"));
}
