rust/hedgewars-server/src/protocol/parser.rs
author Wuzzy <Wuzzy2@mail.ru>
Fri, 14 Dec 2018 00:47:23 +0100
changeset 14440 d4bd2b455247
parent 14415 06672690d71b
child 14457 98ef2913ec73
permissions -rw-r--r--
Append -dev to version string if built in non-release mode
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/** The parsers for the chat and multiplayer protocol. The main parser is `message`.
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 * # Protocol
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 * All messages consist of `\n`-separated strings. The end of a message is
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 * indicated by a double newline - `\n\n`.
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 *
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 * For example, a nullary command like PING will be actually sent as `PING\n\n`.
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 * A unary command, such as `START_GAME nick` will be actually sent as `START_GAME\nnick\n\n`.
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 */
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use nom::*;
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use std::{
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    str, str::FromStr,
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    ops::Range
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};
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use super::{
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    messages::{HWProtocolMessage, HWProtocolMessage::*}
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};
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#[cfg(test)]
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use {
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    super::test::gen_proto_msg,
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    proptest::{proptest, proptest_helper}
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};
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use crate::server::coretypes::{
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    HedgehogInfo, TeamInfo, GameCfg, VoteType, MAX_HEDGEHOGS_PER_TEAM
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};
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named!(end_of_message, tag!("\n\n"));
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named!(str_line<&[u8],   &str>, map_res!(not_line_ending, str::from_utf8));
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named!(  a_line<&[u8], String>, map!(str_line, String::from));
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named!(cmd_arg<&[u8], String>,
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    map!(map_res!(take_until_either!(" \n"), str::from_utf8), String::from));
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named!( u8_line<&[u8],     u8>, map_res!(str_line, FromStr::from_str));
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named!(u16_line<&[u8],    u16>, map_res!(str_line, FromStr::from_str));
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named!(u32_line<&[u8],    u32>, map_res!(str_line, FromStr::from_str));
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named!(yes_no_line<&[u8], bool>, alt!(
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      do_parse!(tag_no_case!("YES") >> (true))
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    | do_parse!(tag_no_case!("NO") >> (false))));
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named!(opt_param<&[u8], Option<String> >, alt!(
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      do_parse!(peek!(tag!("\n\n")) >> (None))
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    | do_parse!(tag!("\n") >> s: str_line >> (Some(s.to_string())))));
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named!(spaces<&[u8], &[u8]>, preceded!(tag!(" "), eat_separator!(" ")));
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named!(opt_space_param<&[u8], Option<String> >, alt!(
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      do_parse!(peek!(tag!("\n\n")) >> (None))
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    | do_parse!(spaces >> s: str_line >> (Some(s.to_string())))));
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named!(hog_line<&[u8], HedgehogInfo>,
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    do_parse!(name: str_line >> eol >> hat: str_line >>
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        (HedgehogInfo{name: name.to_string(), hat: hat.to_string()})));
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named!(_8_hogs<&[u8], [HedgehogInfo; MAX_HEDGEHOGS_PER_TEAM as usize]>,
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    do_parse!(h1: hog_line >> eol >> h2: hog_line >> eol >>
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              h3: hog_line >> eol >> h4: hog_line >> eol >>
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              h5: hog_line >> eol >> h6: hog_line >> eol >>
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              h7: hog_line >> eol >> h8: hog_line >>
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              ([h1, h2, h3, h4, h5, h6, h7, h8])));
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named!(voting<&[u8], VoteType>, alt!(
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      do_parse!(tag_no_case!("KICK") >> spaces >> n: a_line >>
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        (VoteType::Kick(n)))
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    | do_parse!(tag_no_case!("MAP") >>
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        n: opt!(preceded!(spaces, a_line)) >>
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        (VoteType::Map(n)))
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    | do_parse!(tag_no_case!("PAUSE") >>
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        (VoteType::Pause))
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    | do_parse!(tag_no_case!("NEWSEED") >>
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        (VoteType::NewSeed))
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    | do_parse!(tag_no_case!("HEDGEHOGS") >> spaces >> n: u8_line >>
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        (VoteType::HedgehogsPerTeam(n)))));
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/** Recognizes messages which do not take any parameters */
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named!(basic_message<&[u8], HWProtocolMessage>, alt!(
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      do_parse!(tag!("PING") >> (Ping))
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    | do_parse!(tag!("PONG") >> (Pong))
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    | do_parse!(tag!("LIST") >> (List))
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    | do_parse!(tag!("BANLIST")        >> (BanList))
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    | do_parse!(tag!("GET_SERVER_VAR") >> (GetServerVar))
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    | do_parse!(tag!("TOGGLE_READY")   >> (ToggleReady))
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    | do_parse!(tag!("START_GAME")     >> (StartGame))
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    | do_parse!(tag!("ROUNDFINISHED")  >> _m: opt_param >> (RoundFinished))
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    | do_parse!(tag!("TOGGLE_RESTRICT_JOINS")  >> (ToggleRestrictJoin))
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    | do_parse!(tag!("TOGGLE_RESTRICT_TEAMS")  >> (ToggleRestrictTeams))
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    | do_parse!(tag!("TOGGLE_REGISTERED_ONLY") >> (ToggleRegisteredOnly))
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));
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/** Recognizes messages which take exactly one parameter */
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named!(one_param_message<&[u8], HWProtocolMessage>, alt!(
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      do_parse!(tag!("NICK")    >> eol >> n: a_line >> (Nick(n)))
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    | do_parse!(tag!("INFO")    >> eol >> n: a_line >> (Info(n)))
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    | do_parse!(tag!("CHAT")    >> eol >> m: a_line >> (Chat(m)))
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    | do_parse!(tag!("PART")    >> msg: opt_param   >> (Part(msg)))
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    | do_parse!(tag!("FOLLOW")  >> eol >> n: a_line >> (Follow(n)))
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    | do_parse!(tag!("KICK")    >> eol >> n: a_line >> (Kick(n)))
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    | do_parse!(tag!("UNBAN")   >> eol >> n: a_line >> (Unban(n)))
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    | do_parse!(tag!("EM")      >> eol >> m: a_line >> (EngineMessage(m)))
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    | do_parse!(tag!("TEAMCHAT")    >> eol >> m: a_line >> (TeamChat(m)))
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    | do_parse!(tag!("ROOM_NAME")   >> eol >> n: a_line >> (RoomName(n)))
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    | do_parse!(tag!("REMOVE_TEAM") >> eol >> n: a_line >> (RemoveTeam(n)))
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    | do_parse!(tag!("PROTO")   >> eol >> d: u16_line >> (Proto(d)))
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    | do_parse!(tag!("QUIT")   >> msg: opt_param >> (Quit(msg)))
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));
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/** Recognizes messages preceded with CMD */
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named!(cmd_message<&[u8], HWProtocolMessage>, preceded!(tag!("CMD\n"), alt!(
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      do_parse!(tag_no_case!("STATS") >> (Stats))
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    | do_parse!(tag_no_case!("FIX")   >> (Fix))
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    | do_parse!(tag_no_case!("UNFIX") >> (Unfix))
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    | do_parse!(tag_no_case!("RESTART_SERVER") >> spaces >> tag!("YES") >> (RestartServer))
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    | do_parse!(tag_no_case!("REGISTERED_ONLY") >> (ToggleServerRegisteredOnly))
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    | do_parse!(tag_no_case!("SUPER_POWER")     >> (SuperPower))
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    | do_parse!(tag_no_case!("PART")     >> m: opt_space_param >> (Part(m)))
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    | do_parse!(tag_no_case!("QUIT")     >> m: opt_space_param >> (Quit(m)))
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    | do_parse!(tag_no_case!("DELEGATE") >> spaces >> n: a_line  >> (Delegate(n)))
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    | do_parse!(tag_no_case!("SAVE")     >> spaces >> n: cmd_arg >> spaces >> l: cmd_arg >> (Save(n, l)))
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    | do_parse!(tag_no_case!("DELETE")   >> spaces >> n: a_line  >> (Delete(n)))
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    | do_parse!(tag_no_case!("SAVEROOM") >> spaces >> r: a_line  >> (SaveRoom(r)))
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    | do_parse!(tag_no_case!("LOADROOM") >> spaces >> r: a_line  >> (LoadRoom(r)))
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    | do_parse!(tag_no_case!("GLOBAL")   >> spaces >> m: a_line  >> (Global(m)))
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    | do_parse!(tag_no_case!("WATCH")    >> spaces >> i: a_line  >> (Watch(i)))
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    | do_parse!(tag_no_case!("GREETING") >> spaces >> m: a_line  >> (Greeting(m)))
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    | do_parse!(tag_no_case!("VOTE")     >> spaces >> m: yes_no_line >> (Vote(m)))
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    | do_parse!(tag_no_case!("FORCE")    >> spaces >> m: yes_no_line >> (ForceVote(m)))
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    | do_parse!(tag_no_case!("INFO")     >> spaces >> n: a_line  >> (Info(n)))
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    | do_parse!(tag_no_case!("MAXTEAMS") >> spaces >> n: u8_line >> (MaxTeams(n)))
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    | do_parse!(tag_no_case!("CALLVOTE") >>
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        v: opt!(preceded!(spaces, voting)) >> (CallVote(v)))
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    | do_parse!(
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        tag_no_case!("RND") >> alt!(spaces | peek!(end_of_message)) >>
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        v: str_line >>
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        (Rnd(v.split_whitespace().map(String::from).collect())))
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)));
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named!(complex_message<&[u8], HWProtocolMessage>, alt!(
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      do_parse!(tag!("PASSWORD")  >> eol >>
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                    p: a_line     >> eol >>
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                    s: a_line     >>
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                    (Password(p, s)))
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    | do_parse!(tag!("CHECKER")   >> eol >>
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                    i: u16_line   >> eol >>
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                    n: a_line     >> eol >>
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                    p: a_line     >>
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                    (Checker(i, n, p)))
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    | do_parse!(tag!("CREATE_ROOM") >> eol >>
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                    n: a_line       >>
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                    p: opt_param    >>
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                    (CreateRoom(n, p)))
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    | do_parse!(tag!("JOIN_ROOM")   >> eol >>
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                    n: a_line       >>
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                    p: opt_param    >>
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                    (JoinRoom(n, p)))
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    | do_parse!(tag!("ADD_TEAM")    >> eol >>
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                    name: a_line    >> eol >>
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                    color: u8_line  >> eol >>
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                    grave: a_line   >> eol >>
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                    fort: a_line    >> eol >>
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                    voice_pack: a_line >> eol >>
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                    flag: a_line    >> eol >>
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                    difficulty: u8_line >> eol >>
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                    hedgehogs: _8_hogs >>
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                    (AddTeam(Box::new(TeamInfo{
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                        name, color, grave, fort,
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                        voice_pack, flag, difficulty,
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                        hedgehogs, hedgehogs_number: 0
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                     }))))
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    | do_parse!(tag!("HH_NUM")    >> eol >>
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                    n: a_line     >> eol >>
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                    c: u8_line    >>
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                    (SetHedgehogsNumber(n, c)))
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    | do_parse!(tag!("TEAM_COLOR")    >> eol >>
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                    n: a_line     >> eol >>
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                    c: u8_line    >>
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                    (SetTeamColor(n, c)))
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    | do_parse!(tag!("BAN")    >> eol >>
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                    n: a_line     >> eol >>
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                    r: a_line     >> eol >>
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                    t: u32_line   >>
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                    (Ban(n, r, t)))
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    | do_parse!(tag!("BAN_IP")    >> eol >>
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                    n: a_line     >> eol >>
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                    r: a_line     >> eol >>
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                    t: u32_line   >>
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                    (BanIP(n, r, t)))
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    | do_parse!(tag!("BAN_NICK")    >> eol >>
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                    n: a_line     >> eol >>
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                    r: a_line     >> eol >>
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                    t: u32_line   >>
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                    (BanNick(n, r, t)))
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));
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named!(cfg_message<&[u8], HWProtocolMessage>, preceded!(tag!("CFG\n"), map!(alt!(
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      do_parse!(tag!("THEME")    >> eol >>
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                name: a_line     >>
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                (GameCfg::Theme(name)))
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    | do_parse!(tag!("SCRIPT")   >> eol >>
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                name: a_line     >>
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                (GameCfg::Script(name)))
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    | do_parse!(tag!("AMMO")     >> eol >>
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                name: a_line     >>
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                value: opt_param >>
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                (GameCfg::Ammo(name, value)))
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    | do_parse!(tag!("SCHEME")   >> eol >>
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                name: a_line     >>
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                values: opt!(preceded!(eol, separated_list!(eol, a_line))) >>
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                (GameCfg::Scheme(name, values.unwrap_or_default())))
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    | do_parse!(tag!("FEATURE_SIZE") >> eol >>
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                value: u32_line    >>
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                (GameCfg::FeatureSize(value)))
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    | do_parse!(tag!("MAP")      >> eol >>
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                value: a_line    >>
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                (GameCfg::MapType(value)))
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    | do_parse!(tag!("MAPGEN")   >> eol >>
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                value: u32_line  >>
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                (GameCfg::MapGenerator(value)))
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    | do_parse!(tag!("MAZE_SIZE") >> eol >>
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                value: u32_line   >>
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                (GameCfg::MazeSize(value)))
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    | do_parse!(tag!("SEED")     >> eol >>
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                value: a_line    >>
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                (GameCfg::Seed(value)))
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    | do_parse!(tag!("TEMPLATE") >> eol >>
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                value: u32_line  >>
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                (GameCfg::Template(value)))
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    | do_parse!(tag!("DRAWNMAP") >> eol >>
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                value: a_line    >>
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                (GameCfg::DrawnMap(value)))
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), Cfg)));
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named!(malformed_message<&[u8], HWProtocolMessage>,
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    do_parse!(separated_list!(eol, a_line) >> (Malformed)));
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named!(empty_message<&[u8], HWProtocolMessage>,
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    do_parse!(alt!(end_of_message | eol) >> (Empty)));
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named!(message<&[u8], HWProtocolMessage>, alt!(terminated!(
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    alt!(
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          basic_message
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        | one_param_message
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        | cmd_message
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        | complex_message
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        | cfg_message
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        ), end_of_message
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    )
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    | terminated!(malformed_message, end_of_message)
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    | empty_message
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    )
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);
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named!(pub extract_messages<&[u8], Vec<HWProtocolMessage> >, many0!(complete!(message)));
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#[cfg(test)]
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proptest! {
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    #[test]
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    fn is_parser_composition_idempotent(ref msg in gen_proto_msg()) {
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        println!("!! Msg: {:?}, Bytes: {:?} !!", msg, msg.to_raw_protocol().as_bytes());
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        assert_eq!(message(msg.to_raw_protocol().as_bytes()), Ok((&b""[..], msg.clone())))
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    }
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}
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#[test]
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fn parse_test() {
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    assert_eq!(message(b"PING\n\n"),          Ok((&b""[..], Ping)));
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    assert_eq!(message(b"START_GAME\n\n"),    Ok((&b""[..], StartGame)));
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    assert_eq!(message(b"NICK\nit's me\n\n"), Ok((&b""[..], Nick("it's me".to_string()))));
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    assert_eq!(message(b"PROTO\n51\n\n"),     Ok((&b""[..], Proto(51))));
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    assert_eq!(message(b"QUIT\nbye-bye\n\n"), Ok((&b""[..], Quit(Some("bye-bye".to_string())))));
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    assert_eq!(message(b"QUIT\n\n"),          Ok((&b""[..], Quit(None))));
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    assert_eq!(message(b"CMD\nwatch demo\n\n"), Ok((&b""[..], Watch("demo".to_string()))));
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    assert_eq!(message(b"BAN\nme\nbad\n77\n\n"), Ok((&b""[..], Ban("me".to_string(), "bad".to_string(), 77))));
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    assert_eq!(message(b"CMD\nPART\n\n"),      Ok((&b""[..], Part(None))));
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    assert_eq!(message(b"CMD\nPART _msg_\n\n"), Ok((&b""[..], Part(Some("_msg_".to_string())))));
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    assert_eq!(message(b"CMD\nRND\n\n"), Ok((&b""[..], Rnd(vec![]))));
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    assert_eq!(
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        message(b"CMD\nRND A B\n\n"),
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        Ok((&b""[..], Rnd(vec![String::from("A"), String::from("B")])))
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    );
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    assert_eq!(extract_messages(b"QUIT\n1\n2\n\n"),    Ok((&b""[..], vec![Malformed])));
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    assert_eq!(extract_messages(b"PING\n\nPING\n\nP"), Ok((&b"P"[..], vec![Ping, Ping])));
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    assert_eq!(extract_messages(b"SING\n\nPING\n\n"),  Ok((&b""[..],  vec![Malformed, Ping])));
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    assert_eq!(extract_messages(b"\n\n\n\nPING\n\n"),  Ok((&b""[..],  vec![Empty, Empty, Ping])));
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    assert_eq!(extract_messages(b"\n\n\nPING\n\n"),    Ok((&b""[..],  vec![Empty, Empty, Ping])));
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}