'use strict';

function parseWords(str) {
  var obj = {}, words = str.split(" ");
  for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
  return obj;
}
var specials = parseWords("$! $$ $& $? $+ $abook $abs $active $activecid " +
                          "$activewid $address $addtok $agent $agentname $agentstat $agentver " +
                          "$alias $and $anick $ansi2mirc $aop $appactive $appstate $asc $asctime " +
                          "$asin $atan $avoice $away $awaymsg $awaytime $banmask $base $bfind " +
                          "$binoff $biton $bnick $bvar $bytes $calc $cb $cd $ceil $chan $chanmodes " +
                          "$chantypes $chat $chr $cid $clevel $click $cmdbox $cmdline $cnick $color " +
                          "$com $comcall $comchan $comerr $compact $compress $comval $cos $count " +
                          "$cr $crc $creq $crlf $ctime $ctimer $ctrlenter $date $day $daylight " +
                          "$dbuh $dbuw $dccignore $dccport $dde $ddename $debug $decode $decompress " +
                          "$deltok $devent $dialog $did $didreg $didtok $didwm $disk $dlevel $dll " +
                          "$dllcall $dname $dns $duration $ebeeps $editbox $emailaddr $encode $error " +
                          "$eval $event $exist $feof $ferr $fgetc $file $filename $filtered $finddir " +
                          "$finddirn $findfile $findfilen $findtok $fline $floor $fopen $fread $fserve " +
                          "$fulladdress $fulldate $fullname $fullscreen $get $getdir $getdot $gettok $gmt " +
                          "$group $halted $hash $height $hfind $hget $highlight $hnick $hotline " +
                          "$hotlinepos $ial $ialchan $ibl $idle $iel $ifmatch $ignore $iif $iil " +
                          "$inelipse $ini $inmidi $inpaste $inpoly $input $inrect $inroundrect " +
                          "$insong $instok $int $inwave $ip $isalias $isbit $isdde $isdir $isfile " +
                          "$isid $islower $istok $isupper $keychar $keyrpt $keyval $knick $lactive " +
                          "$lactivecid $lactivewid $left $len $level $lf $line $lines $link $lock " +
                          "$lock $locked $log $logstamp $logstampfmt $longfn $longip $lower $ltimer " +
                          "$maddress $mask $matchkey $matchtok $md5 $me $menu $menubar $menucontext " +
                          "$menutype $mid $middir $mircdir $mircexe $mircini $mklogfn $mnick $mode " +
                          "$modefirst $modelast $modespl $mouse $msfile $network $newnick $nick $nofile " +
                          "$nopath $noqt $not $notags $notify $null $numeric $numok $oline $onpoly " +
                          "$opnick $or $ord $os $passivedcc $pic $play $pnick $port $portable $portfree " +
                          "$pos $prefix $prop $protect $puttok $qt $query $rand $r $rawmsg $read $readomo " +
                          "$readn $regex $regml $regsub $regsubex $remove $remtok $replace $replacex " +
                          "$reptok $result $rgb $right $round $scid $scon $script $scriptdir $scriptline " +
                          "$sdir $send $server $serverip $sfile $sha1 $shortfn $show $signal $sin " +
                          "$site $sline $snick $snicks $snotify $sock $sockbr $sockerr $sockname " +
                          "$sorttok $sound $sqrt $ssl $sreq $sslready $status $strip $str $stripped " +
                          "$syle $submenu $switchbar $tan $target $ticks $time $timer $timestamp " +
                          "$timestampfmt $timezone $tip $titlebar $toolbar $treebar $trust $ulevel " +
                          "$ulist $upper $uptime $url $usermode $v1 $v2 $var $vcmd $vcmdstat $vcmdver " +
                          "$version $vnick $vol $wid $width $wildsite $wildtok $window $wrap $xor");
var keywords = parseWords("abook ajinvite alias aline ame amsg anick aop auser autojoin avoice " +
                          "away background ban bcopy beep bread break breplace bset btrunc bunset bwrite " +
                          "channel clear clearall cline clipboard close cnick color comclose comopen " +
                          "comreg continue copy creq ctcpreply ctcps dcc dccserver dde ddeserver " +
                          "debug dec describe dialog did didtok disable disconnect dlevel dline dll " +
                          "dns dqwindow drawcopy drawdot drawfill drawline drawpic drawrect drawreplace " +
                          "drawrot drawsave drawscroll drawtext ebeeps echo editbox emailaddr enable " +
                          "events exit fclose filter findtext finger firewall flash flist flood flush " +
                          "flushini font fopen fseek fsend fserve fullname fwrite ghide gload gmove " +
                          "gopts goto gplay gpoint gqreq groups gshow gsize gstop gtalk gunload hadd " +
                          "halt haltdef hdec hdel help hfree hinc hload hmake hop hsave ial ialclear " +
                          "ialmark identd if ignore iline inc invite iuser join kick linesep links list " +
                          "load loadbuf localinfo log mdi me menubar mkdir mnick mode msg nick noop notice " +
                          "notify omsg onotice part partall pdcc perform play playctrl pop protect pvoice " +
                          "qme qmsg query queryn quit raw reload remini remote remove rename renwin " +
                          "reseterror resetidle return rlevel rline rmdir run ruser save savebuf saveini " +
                          "say scid scon server set showmirc signam sline sockaccept sockclose socklist " +
                          "socklisten sockmark sockopen sockpause sockread sockrename sockudp sockwrite " +
                          "sound speak splay sreq strip switchbar timer timestamp titlebar tnick tokenize " +
                          "toolbar topic tray treebar ulist unload unset unsetall updatenl url uwho " +
                          "var vcadd vcmd vcrem vol while whois window winhelp write writeint if isalnum " +
                          "isalpha isaop isavoice isban ischan ishop isignore isin isincs isletter islower " +
                          "isnotify isnum ison isop isprotect isreg isupper isvoice iswm iswmcs " +
                          "elseif else goto menu nicklist status title icon size option text edit " +
                          "button check radio box scroll list combo link tab item");
var functions = parseWords("if elseif else and not or eq ne in ni for foreach while switch");
var isOperatorChar = /[+\-*&%=<>!?^\/\|]/;
function chain(stream, state, f) {
  state.tokenize = f;
  return f(stream, state);
}
function tokenBase(stream, state) {
  var beforeParams = state.beforeParams;
  state.beforeParams = false;
  var ch = stream.next();
  if (/[\[\]{}\(\),\.]/.test(ch)) {
    if (ch == "(" && beforeParams) state.inParams = true;
    else if (ch == ")") state.inParams = false;
    return null;
  }
  else if (/\d/.test(ch)) {
    stream.eatWhile(/[\w\.]/);
    return "number";
  }
  else if (ch == "\\") {
    stream.eat("\\");
    stream.eat(/./);
    return "number";
  }
  else if (ch == "/" && stream.eat("*")) {
    return chain(stream, state, tokenComment);
  }
  else if (ch == ";" && stream.match(/ *\( *\(/)) {
    return chain(stream, state, tokenUnparsed);
  }
  else if (ch == ";" && !state.inParams) {
    stream.skipToEnd();
    return "comment";
  }
  else if (ch == '"') {
    stream.eat(/"/);
    return "keyword";
  }
  else if (ch == "$") {
    stream.eatWhile(/[$_a-z0-9A-Z\.:]/);
    if (specials && specials.propertyIsEnumerable(stream.current().toLowerCase())) {
      return "keyword";
    }
    else {
      state.beforeParams = true;
      return "builtin";
    }
  }
  else if (ch == "%") {
    stream.eatWhile(/[^,\s()]/);
    state.beforeParams = true;
    return "string";
  }
  else if (isOperatorChar.test(ch)) {
    stream.eatWhile(isOperatorChar);
    return "operator";
  }
  else {
    stream.eatWhile(/[\w\$_{}]/);
    var word = stream.current().toLowerCase();
    if (keywords && keywords.propertyIsEnumerable(word))
      return "keyword";
    if (functions && functions.propertyIsEnumerable(word)) {
      state.beforeParams = true;
      return "keyword";
    }
    return null;
  }
}
function tokenComment(stream, state) {
  var maybeEnd = false, ch;
  while (ch = stream.next()) {
    if (ch == "/" && maybeEnd) {
      state.tokenize = tokenBase;
      break;
    }
    maybeEnd = (ch == "*");
  }
  return "comment";
}
function tokenUnparsed(stream, state) {
  var maybeEnd = 0, ch;
  while (ch = stream.next()) {
    if (ch == ";" && maybeEnd == 2) {
      state.tokenize = tokenBase;
      break;
    }
    if (ch == ")")
      maybeEnd++;
    else if (ch != " ")
      maybeEnd = 0;
  }
  return "meta";
}
const mirc = {
  startState: function() {
    return {
      tokenize: tokenBase,
      beforeParams: false,
      inParams: false
    };
  },
  token: function(stream, state) {
    if (stream.eatSpace()) return null;
    return state.tokenize(stream, state);
  }
};

exports.mirc = mirc;
