package function.builtin;

import function.*;
import sexpression.*;

public class APPLY extends LispFunction {

    private ArgumentValidator argumentValidator;

    public static SExpression apply(Cons argList) {
        return new APPLY().call(argList);
    }

    public APPLY() {
        this.argumentValidator = new ArgumentValidator("APPLY");
        this.argumentValidator.setExactNumberOfArguments(2);
        this.argumentValidator.setTrailingArgumentExpectedType(Cons.class);
    }

    public SExpression call(Cons argList) {
        argumentValidator.validate(argList);

        Cons cdr = (Cons) argList.getCdr();
        SExpression functionName = argList.getCar();
        SExpression argumentList = cdr.getCar();
        LispFunction function = EVAL.lookupFunctionOrLambda(functionName);

        return function.call((Cons) argumentList);
    }

}