#ifndef FURAS_TOKEN_HPP
#define FURAS_TOKEN_HPP

#include <cstdint>
#include <string_view>

namespace furas {

struct token {
    enum type {
        Identifier = 0, /**< An identifier. */
        Signed,         /**< A signed integer. */
        Unsigned,       /**< An unsigned integer. */

        // Markers
        Monkey,  /**< Constant marker (`@`). */
        Dolar,   /**< Type marker(`$`). */
        Sha256,  /**< Label marker(`#`). */
        Percent, /**< Variable marker(`%`). The more the better. */

        EqSign, /**< `=` */
        Dot,    /**< . */
        Colon,  /**< `:` */

        // Keywords
        Func,     /**< `func` keyword for defining functions. */
        Type,     /**< `type` keyword for defining types. */
        Native,   /**< `native` keyword for native functions. :v: */
        Import,   /**< `import` keyword for importing functions and types. */
        Public,   /**< `public` access specifier. */
        Private,  /**< `private` access specifier. */
        Allocate, /**< `allocate` keyword for global variables. */

        // Instructions
        Push,
        Array,
        Slice,
        Get,
        Set,
        Drop,
        Dup,
        Swap,
        Clone,
        Ref,
        Add,
        Sub,
        Mul,
        Div,
        Mod,
        Eq,
        Neq,
        Lt,
        Gt,
        Le,
        Ge,
        Ptrof,
        Sizeof,
        Lenof,
        Load,
        Store,
        LoadGlobal,
        StoreGlobal,
        Call,
        Jmp,
        Jnz,
        Ret,

        Count
    } type = Count;
    union value {
        std::nullptr_t   null = nullptr;
        std::string_view string;
        std::int64_t     integer;
        std::uint64_t    uint;
    } value;

    token(enum type type)
      : type(type) {}

    token(enum type type, std::string_view string)
      : type(type) {
        value.string = string;
    }

    token(std::uint64_t num)
      : type(Unsigned) {
        value.uint = num;
    }

    token(std::int64_t num)
      : type(Signed) {
        value.integer = num;
    }
};

} // namespace furas

#endif // FURAS_TOKEN_HPP