using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ShintenScript
{
    public struct Token
    {
        public enum Type
        {
            NULL,
            EOF,
            IDENTIFIER,
            NUMBER,

            SEMICOLON,
            LPAREN, RPAREN, LBRACE, RBRACE,
            PLUS, MINUS, ASTERISK, SLASH,
            GT, LT, EQ, GE, LE, NE,
            ASSIGN,
            PLUSASSIGN, MINUSASSIGN, ASTERISKASSIGN, SLASHASSIGN,

            IF, WHILE, FN
        }

        public Type type;
        public object data;

        public bool Null()
        {
            return type == Type.NULL;
        }

        public override int GetHashCode()
        {
            return (int)type;
        }

        public override bool Equals(object obj)
        {
            if (obj is Token other)
            {
                return type == other.type && ((data == null && other.data == null) || (data != null && other.data != null && data.Equals(other.data)));
            }

            return false;
        }

        public override string ToString()
        {
            return $"{type} {data?.ToString() ?? "null"}";
        }
    }
}