bencode_parser.hpp

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#pragma once
 
#include <string>
#include <vector>
 
#include "bencode_value.hpp"
#include "util/result.hpp"
 
namespace fur::bencode {
 
enum class BencodeParserError {
  InvalidString,
  IntFormat,
  IntValue,
  StringFormat,
  ListFormat,
  DictFormat,
  DictKey,
  DictKeyOrder
};
 
std::string error_to_string(BencodeParserError error);
 
using BencodeResult =
    util::Result<std::unique_ptr<BencodeValue>, BencodeParserError>;
 
class BencodeParser {
 private:
  int64_t _index{};
  std::string _tokens;
  BencodeResult decode();
  BencodeResult decode_int();
  BencodeResult decode_string();
  BencodeResult decode_list();
  BencodeResult decode_dict();
 
 public:
  BencodeParser() = default;
  ~BencodeParser() = default;
  BencodeResult decode(std::string const& decoded);
 
  static std::string encode(BencodeValue const& value);
};
 
}  // namespace fur::bencode