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#pragma once
#include <vector>
#include <string>
#include <string_view>
#include <optional>
#include <utility>
#include <functional>
#include <variant>
#include "process.h"
using namespace std;
class Referee {
Process proc;
string refereeExecname;
int numPlayers;
string reftag;
struct Features {
// Referee supports current version of the protocol.
bool version2;
};
Features features;
void queryFeatures();
public:
struct ReadEvent {
int player;
// call with the line read (no newline)
function<void(const string&)> callback;
};
struct WriteEvent {
int player;
string line;
};
struct GamelogEvent {
int player;
string line;
};
struct EndEvent {
vector<int> scores;
};
struct ErrorEvent {
int player;
string message;
};
using Event = variant<ReadEvent, WriteEvent, GamelogEvent, EndEvent, ErrorEvent>;
Referee(const string_view execname, const vector<string> &players);
~Referee();
Event nextEvent();
// Kills the referee process
void terminate();
};
/*
Referee protocol:
At startup, the referee should write a number of lines to stdout of the form
'feature <name>', indicating that the referee supports the feature given by
<name>. The list of features should be ended with a line containing
'feature_end'. To use the version of the protocol described here, it is
mandatory to request 'feature version_2'. For supported features and their
effect, see below.
The referee then receives a line containing the number of players in the game,
followed by that number of lines containing the players' names.
Then, the referee has the following commands available:
- 'read <player>': read a line from the player with index <player>; this line
is written directly to the referee afterwards. The first player is 0, the
second player is 1, etc.
- 'write <player> <line>': write a line to the player with index <player>.
- 'gamelog <player> <line>': write a line in the game log indicating that the
player with index <player> made the move given by <line>.
- 'end <score> <score> ...': signify that the game has ended. The final scores
of the players are given after 'end'. These scores should be given as a
space-separated list of integers, as many as there are players.
- 'error <player> <message>': indicate that the player with index <player> has
produced erroneous output. This ends the game. The <message> will be
presented to the user and written to the gamelog.
FEATURES
Currently, the following features are supported:
- 'version_2': must be used by all referees.
*/
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