transcendental-lisp/src/sexpression/SExpression.java

package sexpression;

@DisplayName("s-expression")
public abstract class SExpression {

    public boolean isNull() {
        return false;
    }

    public boolean isAtom() {
        return false;
    }

    public boolean isCons() {
        return false;
    }

    public boolean isList() {
        return (isCons() || isNull());
    }

    public boolean isNumber() {
        return false;
    }

    public boolean isSymbol() {
        return false;
    }

    public boolean isFunction() {
        return false;
    }

    public boolean isString() {
        return false;
    }

}