package sexpression;

import java.text.MessageFormat;

import error.LispException;

public class LispNumber extends Atom {

    private int value;

    public LispNumber(String text) {
        super(text.replaceFirst("^0+(?!$)", ""));

        try {
            this.value = Integer.parseInt(text);
        } catch (NumberFormatException e) {
            throw new InvalidNumberException(text);
        }
    }

    public LispNumber(int value) {
        super(Integer.toString(value));

        this.value = value;
    }

    public boolean numberp() {
        return true;
    }

    public int getValue() {
        return value;
    }

    public class InvalidNumberException extends LispException {

        private static final long serialVersionUID = 1L;
        private String text;

        public InvalidNumberException(String text) {
            this.text = text;
        }

        @Override
        public String getMessage() {
            return MessageFormat.format("{0} is not a valid integer", text);
        }
    }

}