Token.h

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/*

             *
            ***
           *****
   *********************       Mercenaries Engineering SARL
     *****************              Copyright (C) 2024
       *************
         *********        http://www.mercenaries-engineering.com
        ***********
       ****     ****
      **           **

*/

#pragma once

#include "Export.h"

#include<memory>

namespace maquina
{


class Token
{
  friend class TokenManager;
public:
  Token() = delete;
  Token(Token&&) = delete;
  Token& operator=(Token&&) = delete;

  MAQUINA_EXPORT explicit Token(const char* s);

  Token(const Token& o) : _internal(o._internal) {}

  Token& operator=(const Token& o) { _internal = o._internal; return *this; };

  const char* c_str() const { return _internal->c_str; }

  const std::string& string() const { return *_internal->string; }

  std::string_view string_view() const { return {_internal->c_str, _internal->size}; }

  std::size_t size() const { return _internal->size; }

  std::size_t hash() const { return _internal->hash; }

  bool operator==(const Token& o) const { return _internal == o._internal; }
  bool operator!=(const Token& o) const { return _internal != o._internal; }
  bool operator<(const Token& o) const { return _internal < o._internal; }
  bool operator<=(const Token& o) const { return _internal <= o._internal; }
  bool operator>(const Token& o) const { return _internal > o._internal; }
  bool operator>=(const Token& o) const { return _internal >= o._internal; }
private:

  class _InternalToken
  {
  public:
    _InternalToken(std::unique_ptr<std::string>& s_) : c_str(s_->c_str()), size(s_->size()), string(s_.release()), hash(std::hash<std::string>{}(*string)) {}

    const char* c_str;
    std::size_t size;
    std::unique_ptr<std::string> string;
    std::size_t hash;
  };

  const _InternalToken* _internal;
};

}

// A hash method for tokens
template<> struct std::hash<maquina::Token>
{
  std::size_t operator()(const maquina::Token& token) const
  {
    return token.hash();
  }
};