package serene.simple;


public class SpecialForm extends Node {
    private static final SymbolNode DEF = new SymbolNode("def");
    private static final SymbolNode FN = new SymbolNode("fn");
    private static final SymbolNode IF = new SymbolNode("if");
    private static final SymbolNode QUOTE = new SymbolNode("quote");

    public final ListNode<Node> node;

    public SpecialForm(ListNode<Node> node) {
        this.node = node;
    }

    public static Node check(ListNode<Node> l) {
        if (l == ListNode.EMPTY) {
            return l;
        } else if (l.first.equals(DEF)) {
            return new DefSpecialForm(l);
        } else if (l.first.equals(FN)) {
            return new FnSpecialForm(l);
        } else if (l.first.equals(IF)) {
            return new IfSpecialForm(l);
        } else if (l.first.equals(QUOTE)) {
            return new QuoteSpecialForm(l);
        }
        return l;
    }

    @Override
    public Object eval(Scope scope) {
        throw new SereneException("Can't use SpecialForm directly");
    }
}