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Diff for /loncom/interface/lonnavmaps.pm between versions 1.82 and 1.132

version 1.82, 2002/10/15 19:51:25 version 1.132, 2003/01/30 21:36:57
Line 37 Line 37
 # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer  # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
 # YEAR=2002  # YEAR=2002
 # 1/1 Gerd Kortemeyer  # 1/1 Gerd Kortemeyer
 #  # Oct-Nov Jeremy Bowers
   
 package Apache::lonnavmaps;  package Apache::lonnavmaps;
   
 use strict;  use strict;
 use Apache::Constants qw(:common :http);  use Apache::Constants qw(:common :http);
 use Apache::lonnet();  
 use Apache::loncommon();  use Apache::loncommon();
 use GDBM_File;  
 use POSIX qw (floor strftime);  use POSIX qw (floor strftime);
   
 # -------------------------------------------------------------- Module Globals  my %navmaphash;
 my %hash;  
 my @rows;  
   
 #  
 # These cache hashes need to be independent of user, resource and course  
 # (user and course can/should be in the keys)  
 #  
   
 my %courserdatas;  
 my %userrdatas;  
   
 #  
 # These global hashes are dependent on user, course and resource,   
 # and need to be initialized every time when a sheet is calculated  
 #  
 my %courseopt;  
 my %useropt;  
 my %parmhash;  my %parmhash;
   
 # This parameter keeps track of whether obtaining the user's information  sub cleanup {
 # failed, which the colorizer in astatus can use      if (tied(%navmaphash)){
 my $networkFailedFlag = 0;   &Apache::lonnet::logthis('Cleanup navmaps: navmaphash');
           unless (untie(%navmaphash)) {
 # ------------------------------------------------------------------ Euclid gcd      &Apache::lonnet::logthis('Failed cleanup navmaps: navmaphash');
   
 sub euclid {  
     my ($e,$f)=@_;  
     my $a; my $b; my $r;  
     if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }  
     while ($r!=0) {  
         $a=$b; $b=$r;  
         $r=$a%$b;  
     }  
     return $b;  
 }  
   
 # --------------------------------------------------------------------- Parmval  
   
 # -------------------------------------------- Figure out a cascading parameter  
 #  
 # For this function to work  
 #  
 # * parmhash needs to be tied  
 # * courseopt and useropt need to be initialized for this user and course  
 #  
   
 sub parmval {  
     my ($what,$symb)=@_;  
     my $cid=$ENV{'request.course.id'};  
     my $csec=$ENV{'request.course.sec'};  
     my $uname=$ENV{'user.name'};  
     my $udom=$ENV{'user.domain'};  
   
     unless ($symb) { return ''; }  
     my $result='';  
   
     my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);  
   
 # ----------------------------------------------------- Cascading lookup scheme  
     my $rwhat=$what;  
     $what=~s/^parameter\_//;  
     $what=~s/\_/\./;  
   
     my $symbparm=$symb.'.'.$what;  
     my $mapparm=$mapname.'___(all).'.$what;  
     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;  
   
     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;  
     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;  
     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;  
   
     my $courselevel= $usercourseprefix.'.'.$what;  
     my $courselevelr=$usercourseprefix.'.'.$symbparm;  
     my $courselevelm=$usercourseprefix.'.'.$mapparm;  
   
 # ---------------------------------------------------------- first, check user  
     if (defined($uname)) {  
         if (defined($useropt{$courselevelr})) { return $useropt{$courselevelr}; }  
         if (defined($useropt{$courselevelm})) { return $useropt{$courselevelm}; }  
         if (defined($useropt{$courselevel})) { return $useropt{$courselevel}; }  
     }  
   
 # ------------------------------------------------------- second, check course  
     if (defined($csec)) {  
         if (defined($courseopt{$seclevelr})) { return $courseopt{$seclevelr}; }  
         if (defined($courseopt{$seclevelm})) { return $courseopt{$seclevelm}; }  
         if (defined($courseopt{$seclevel})) { return $courseopt{$seclevel}; }  
     }  
   
     if (defined($courseopt{$courselevelr})) { return $courseopt{$courselevelr}; }  
     if (defined($courseopt{$courselevelm})) { return $courseopt{$courselevelm}; }  
     if (defined($courseopt{$courselevel})) { return $courseopt{$courselevel}; }  
   
 # ----------------------------------------------------- third, check map parms  
   
     my $thisparm=$parmhash{$symbparm};  
     if (defined($thisparm)) { return $thisparm; }  
   
 # ----------------------------------------------------- fourth , check default  
   
     my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');  
     if (defined($default)) { return $default}  
   
 # --------------------------------------------------- fifth , cascade up parts  
   
     my ($space,@qualifier)=split(/\./,$rwhat);  
     my $qualifier=join('.',@qualifier);  
     unless ($space eq '0') {  
         my ($part,$id)=split(/\_/,$space);  
         if ($id) {  
             my $partgeneral=&parmval($part.".$qualifier",$symb);  
             if (defined($partgeneral)) { return $partgeneral; }  
         } else {  
             my $resourcegeneral=&parmval("0.$qualifier",$symb);  
             if (defined($resourcegeneral)) { return $resourcegeneral; }  
         }  
     }  
     return '';  
 }  
   
   
   
 # ------------------------------------------------------------- Find out status  
 # return codes  
 # tcode (timecode)  
 # 1: will open later  
 # 2: is open and not past due yet  
 # 3: is past due date  
 # 4: due in the next 24 hours  
 #  
 # code (curent solved status)  
 # 1: not attempted  
 # 2: attempted but wrong, or incorrect by instructor  
 # 3: solved or correct by instructor  
 # 4: partially correct (one or more parts correct)  
 # "excused" needs to be supported, but is not yet.  
 sub astatus {  
     my $rid=shift;  
     my $code=0;  
     my $ctext='';  
     $rid=~/(\d+)\.(\d+)/;  
     my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.  
         &Apache::lonnet::declutter($hash{'src_'.$rid});  
     my %duedate=();  
     my %opendate=();  
     my %answerdate=();  
     # need to always check part 0's open/due/answer status  
     foreach (sort(split(/\,/,&Apache::lonnet::metadata($hash{'src_'.$rid},'allpo\ssiblekeys')))) {  
         if ($_=~/^parameter\_(.*)\_opendate$/) {  
             my $part=$1;  
             $duedate{$part}=&parmval($part.'.duedate',$symb);  
             $opendate{$part}=&parmval($part.'.opendate',$symb);  
             $answerdate{$part}=&parmval($part.'.answerdate',$symb);  
             if (&parmval($part.'.opendate.type',$symb) eq 'date_interval') {  
                 $opendate{$part}=$duedate{$part}-$opendate{$part};  
             }  
             if (&parmval($part.'.answerdate.type',$symb) eq 'date_interval') {  
                 $answerdate{$part}=$duedate{$part}+$answerdate{$part};  
             }  
         }  
     }  
     my $now=time;  
     my $tcode=0;  
   
     my %returnhash=&Apache::lonnet::restore($symb);  
   
     foreach (sort(keys(%opendate))) {  
         my $duedate=$duedate{$_};  
         my $opendate=$opendate{$_};  
         my $answerdate=$answerdate{$_};  
         my $preface='';  
         unless ($_ eq '0') { $preface=' Part: '.$_.' '; }  
         if ($opendate) {  
             if ($now<$duedate || (!$duedate)) {  
                 unless ($tcode==4) { $tcode=2; }  
                 if ($duedate) {  
                     $ctext.=$preface.'Due: '.localtime($duedate);  
                 } else {  
                     $ctext.=$preface.'No Due Date';  
                 }  
                 if ($now<$opendate) {  
                     unless ($tcode) { $tcode=1; }  
                     $ctext.=$preface.'Open: '.localtime($opendate);  
                 }  
                 if ($duedate && $duedate-$now<86400) {  
                     $tcode=4;  
                     $ctext.=$preface.'Due: '.localtime($duedate);  
                 }  
             } else {  
                 unless (($tcode==4) || ($tcode eq 2)) { $tcode=3; }  
                 if ($now<$answerdate) {  
                     $ctext.='Answer: '.localtime($duedate);  
                 }  
             }  
         } else {  
             unless (($tcode==2) || ($tcode==4)) { $tcode=1; }  
         }  
           
         my $status=$returnhash{'resource.'.$_.'.solved'};  
           
         if ($status eq 'correct_by_student') {  
             if ($code==0||$code==3) { $code=3; } else { $code=4; }  
             $ctext.=' solved';  
         } elsif ($status eq 'correct_by_override') {  
             if ($code==0||$code==3) { $code=3; } else { $code=4; }  
             $ctext.=' override';  
         } elsif ($status eq 'incorrect_attempted') {  
             if ($code!=4 && $code!=3) { $code=2; }  
             if ($code==3) { $code=4; }  
             $ctext.=' ('.  
                 ($returnhash{'resource.'.$_.'.tries'}?  
                  $returnhash{'resource.'.$_.'.tries'}:'0');  
             my $numtries = &parmval($_.'.maxtries',$symb);  
             if ($numtries) { $ctext.='/'.$numtries.' tries'; }  
             $ctext.=')';  
         } elsif ($status eq 'incorrect_by_override') {  
             if ($code!=4 && $code!=3) { $code=2; }  
             if ($code==3) { $code=4; }  
             $ctext.=' override';  
         } elsif ($status eq 'excused') {  
             if ($code==0||$code==3) { $code=3; } else { $code=4; }  
             $ctext.=' excused';  
         } else {  
             if ($code==0) { $code=1; }  
         }  
     }  
   
     return 'p'.$code.$tcode.'"'.$ctext.'"';  
 }  
   
   
 sub addresource {  
     my ($resource,$sofar,$rid,$showtypes,$indent,$linkid)=@_;  
     if ($showtypes eq 'problems') {  
         if ($resource!~/\.(problem|exam|quiz|assess|survey|form)$/) {  
             return;  
         }  
     }  
     my $brepriv=&Apache::lonnet::allowed('bre',$resource);  
     if ($hash{'src_'.$rid}) {  
         if (($brepriv eq '2') || ($brepriv eq 'F')) {  
             my $pprefix='';  
             if ($resource=~/\.(problem|exam|quiz|assess|survey|form)$/) {  
                 $pprefix=&astatus($rid);  
             }  
             $$sofar++;  
             if ($indent) { $pprefix='i'.$indent.','.$pprefix; }  
             if ($linkid) { $pprefix='l'.$linkid.','.$pprefix; }  
             if (defined($rows[$$sofar])) {  
                 $rows[$$sofar].='&'.$pprefix.$rid;  
             } else {  
                 $rows[$$sofar]=$pprefix.$rid;  
             }  
         }  
     }  
 }  
   
 sub followlinks () {  
     my ($rid,$sofar,$beenhere,$further,$showtypes,$indent,$linkid)=@_;  
     my $mincond=1;  
     my $next='';  
     foreach (split(/\,/,$hash{'to_'.$rid})) {  
         my $thiscond=  
             &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});  
         if ($thiscond>=$mincond) {  
             if ($next) {  
                 $next.=','.$_.':'.$thiscond;  
             } else {  
                 $next=$_.':'.$thiscond;  
             }  
             if ($thiscond>$mincond) { $mincond=$thiscond; }  
         }  
     }  
     my $col=0;  
     &Apache::lonxml::debug("following links -$next-");  
     foreach (split(/\,/,$next)) {  
         my ($nextlinkid,$condval)=split(/\:/,$_);  
         if ($condval>=$mincond) {  
             my $now=&tracetable($sofar,$hash{'goesto_'.$nextlinkid},  
                                 $beenhere,$showtypes,$indent,$linkid);  
             if ($now>$further) {                  
                 if ($col>0) {  
                     my $string;  
                     for(my $i=0;$i<$col;$i++) { $string.='&'; }  
                     for(my $i=$further+1;$now-1>$i;$i++) {  
                         $rows[$i]=$string.$rows[$i];  
                     }  
                 }  
                 $further=$now;  
             }  
         }          }
         $col++;  
     }      }
     return $further;      if (tied(%parmhash)){
 }   &Apache::lonnet::logthis('Cleanup navmaps: parmhash');
 # ------------------------------------------------------------ Build page table          unless (untie(%parmhash)) {
       &Apache::lonnet::logthis('Failed cleanup navmaps: parmhash');
 sub tracetable {  
     my ($sofar,$rid,$beenhere,$showtypes,$indent,$linkid)=@_;  
     my $newshowtypes=$showtypes;  
     my $further=$sofar;  
 # $Apache::lonxml::debug=1;  
     &Apache::lonxml::debug("$rid ; $linkid ; $sofar ; $beenhere ; ".$hash{'src_'.$rid});  
     if ($beenhere=~/\&$rid\&/) { return $further; }  
     $beenhere.=$rid.'&';  
   
     if (defined($hash{'is_map_'.$rid})) {  
         $sofar++;  
         my $tprefix='';  
         if ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}  
             eq 'sequence') {  
             $tprefix='h';  
         } elsif ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}  
                  eq 'page') {  
             $tprefix='j';  
             if ($indent) { $tprefix='i'.$indent.','.$tprefix; }  
             if ($linkid) { $tprefix='l'.$linkid.','.$tprefix; }  
             $newshowtypes='problems';  
             $indent++;  
             #if in a .page continue to link the encompising .page  
             if (!$linkid) { $linkid=$rid; }  
         }          }
         if (defined($rows[$sofar])) {  
             $rows[$sofar].='&'.$tprefix.$rid;  
         } else {  
             $rows[$sofar]=$tprefix.$rid;  
         }  
         if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&  
             (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {  
             my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};  
             $sofar=&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},  
                                '&'.$frid.'&',$newshowtypes,$indent,$linkid);  
             &addresource($hash{'src_'.$frid},\$sofar,$frid,$newshowtypes,  
                          $indent,$linkid);  
             if ($tprefix =~ /j$/) { $indent--; $linkid=''; }  
         }  
     } else {  
         &addresource($hash{'src_'.$rid},\$sofar,$rid,$showtypes,  
                      $indent,$linkid);  
     }  
   
     if (defined($hash{'to_'.$rid})) {  
         $further=&followlinks($rid,$sofar,$beenhere,$further,$showtypes,  
                               $indent,$linkid);  
     }      }
   
     return $further;  
 }  }
   
 # ================================================================ Main Handler  
   
 sub handler {  sub handler {
     my $r=shift;      my $r = shift;
       real_handler($r);
     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});  
   
     if ($ENV{'form.jtest'} ne "1")  
     {  
         return new_handle($r);  
     }  
   
 # ------------------------------------------- Set document type for header only  
   
     if ($r->header_only) {  
         if ($ENV{'browser.mathml'}) {  
             $r->content_type('text/xml');  
         } else {  
             $r->content_type('text/html');  
         }  
         $r->send_http_header;  
         return OK;  
     }  
     my $requrl=$r->uri;  
     my $hashtied;  
 # ----------------------------------------------------------------- Tie db file  
     my $fn;  
     if ($ENV{'request.course.fn'}) {  
         $fn=$ENV{'request.course.fn'};  
         if (-e "$fn.db") {  
             if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) &&  
                 (tie(%parmhash,'GDBM_File',  
                      $ENV{'request.course.fn'}.'_parms.db',  
                      &GDBM_READER(),0640))) {  
                 $hashtied=1;  
             }  
         }  
     }  
     if (!$hashtied) {  
         $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";  
         return HTTP_NOT_ACCEPTABLE;   
     }  
   
 # ------------------------------------------------------------------- Hash tied  
   
     if ($ENV{'browser.mathml'}) {  
         $r->content_type('text/xml');  
     } else {  
         $r->content_type('text/html');  
     }  
     &Apache::loncommon::no_cache($r);  
     $r->send_http_header;  
   
     my $firstres=$hash{'map_start_'.  
            &Apache::lonnet::clutter($ENV{'request.course.uri'})};  
     my $lastres=$hash{'map_finish_'.  
            &Apache::lonnet::clutter($ENV{'request.course.uri'})};  
     if (!(($firstres) && ($lastres))) {  
         $r->print('<html><body>Coursemap undefined.</body></html>');  
     } else {  
   
 # ----------------------------------------------------------------- Render page  
 # -------------------------------------------------------------- Set parameters  
   
   
 # ---------------------------- initialize coursedata and userdata for this user  
         undef %courseopt;  
         undef %useropt;  
   
         my $uname=$ENV{'user.name'};  
         my $udom=$ENV{'user.domain'};  
         my $uhome=$ENV{'user.home'};  
         my $cid=$ENV{'request.course.id'};  
         my $chome=$ENV{'course.'.$cid.'.home'};  
         my ($cdom,$cnum)=split(/\_/,$cid);  
   
         my $userprefix=$uname.'_'.$udom.'_';  
           
         unless ($uhome eq 'no_host') {   
 # ------------------------------------------------- Get coursedata (if present)  
             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {  
                 my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.  
                                                  ':resourcedata',$chome);  
                 if ($reply!~/^error\:/) {  
                     $courserdatas{$cid}=$reply;  
                     $courserdatas{$cid.'.last_cache'}=time;  
                 }  
                 # check to see if network failed  
                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )  
                 {  
                     $networkFailedFlag = 1;  
                 }  
             }  
             foreach (split(/\&/,$courserdatas{$cid})) {  
                 my ($name,$value)=split(/\=/,$_);  
                 $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=  
                     &Apache::lonnet::unescape($value);  
             }  
 # --------------------------------------------------- Get userdata (if present)  
             unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {  
                 my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);  
                 if ($reply!~/^error\:/) {  
                     $userrdatas{$uname.'___'.$udom}=$reply;  
                     $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;  
                 }  
             }  
             foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {  
                 my ($name,$value)=split(/\=/,$_);  
                 $useropt{$userprefix.&Apache::lonnet::unescape($name)}=  
                     &Apache::lonnet::unescape($value);  
             }  
         }  
   
         @rows=();  
   
         &tracetable(0,$firstres,'&','',0);  
   
 # ------------------------------------------------------------------ Page parms  
   
         my $j;  
         my $i;  
         my $lcm=1;  
         my $contents=0;  
   
 # ---------------------------------------------- Go through table to get layout  
   
         for ($i=0;$i<=$#rows;$i++) {  
             if ($rows[$i]) {  
                 &Apache::lonxml::debug("Row $i is:".$rows[$i]);  
                 $contents++;  
                 my @colcont=split(/\&/,$rows[$i]);  
                 $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));  
             }   
         }  
   
   
         unless ($contents) {  
             $r->print('<html><body>Empty Map.</body></html>');  
         } else {  
   
 # ------------------------------------------------------------------ Build page  
   
             my $currenturl=$ENV{'form.postdata'};  
             $currenturl=~s/^http\:\/\///;  
             $currenturl=~s/^[^\/]+//;  
   
 # ---------------------------------------------------------------- Send headers  
   
             my $date=localtime;  
             my $now=time;  
 # ----------------------------------------- Get email status and discussiontime  
   
             my %emailstatus=&Apache::lonnet::dump('email_status');  
             my $logouttime=$emailstatus{'logout'};  
             my $courseleave=$emailstatus{'logout_'.$ENV{'request.course.id'}};  
             my $lastcheck=($courseleave>$logouttime?$courseleave:$logouttime);  
   
             my %discussiontimes=&Apache::lonnet::dump('discussiontimes',  
                                                           $cdom,$cnum);  
   
             my %feedback=();  
             my %error=();  
             foreach my $msgid (split(/\&/,&Apache::lonnet::reply('keys:'.  
                                                                  $ENV{'user.domain'}.':'.  
                                                                  $ENV{'user.name'}.':nohist_email',  
                                                                  $ENV{'user.home'}))) {  
                 $msgid=&Apache::lonnet::unescape($msgid);  
                 my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));  
                 if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {  
                     my ($what,$url)=($1,$2);  
                     my %status=  
                         &Apache::lonnet::get('email_status',[$msgid]);  
                     if ($status{$msgid}=~/^error\:/) {   
                         $status{$msgid}='';   
                     }  
                           
                     if (($status{$msgid} eq 'new') ||   
                         (!$status{$msgid})) {   
                         if ($what eq 'Error') {  
                             $error{$url}.=','.$msgid;   
                         } else {  
                             $feedback{$url}.=','.$msgid;  
                         }  
                     }  
                 }  
             }  
 # ----------------------------------------------------------- Start Page Output  
             my $bodytagadd='';  
             $r->print(  
                    '<html><head><title>Navigate Course Map</title></head>');  
             if (($currenturl=~/^\/res/) &&  
                 ($currenturl!~/^\/res\/adm/)) {  
                 $bodytagadd='onLoad="window.location.hash='."'curloc'".'"';  
             }  
             $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',  
                                                   $bodytagadd));  
             $r->print('<script>window.focus();</script>');  
             my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};  
             if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }  
             $r->print("<h3>$date</h3>\n");  
             $r->rflush();  
             $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.  
                       localtime($lastcheck).  
                       '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>');   
             if (($currenturl=~/^\/res/) &&  
                 ($currenturl!~/^\/res\/adm/)) {  
                 $r->print('<a href="#curloc">Current Location</a><p>');  
             }  
   
             # Handle a network error  
   
             if ($networkFailedFlag)  
             {  
                 $r->print('<H2>LON-CAPA network failure.</H2>'."\n");  
                 $r->print("<p>LON-CAPA's network is having difficulties, some problem" .  
                           " information, such as due dates, will not be available.");  
             }  
 # ----------------------------------------------------- The little content list  
             for ($i=0;$i<=$#rows;$i++) {  
                 if ($rows[$i]) {  
                     my @colcont=split(/\&/,$rows[$i]);  
                     my $avespan=$lcm/($#colcont+1);  
                     for ($j=0;$j<=$#colcont;$j++) {  
                         my $rid=$colcont[$j];  
                         if ($rid=~/^h(.+)/) {  
                             $rid=$1;  
                             $r->print('&nbsp;&nbsp;&nbsp;<a href="#'.  
                                       $rid.'">'.$hash{'title_'.$rid}.  
                                       '</a><br>');  
                         }  
                     }  
                 }  
             }  
 # ----------------------------------------------------------------- Start table  
             $r->print('<hr><table cols="'.$lcm.'" border="0">');  
             for ($i=0;$i<=$#rows;$i++) {  
                 if ($rows[$i]) {  
                     $r->print("\n<tr>");  
                     my @colcont=split(/\&/,$rows[$i]);  
                     my $avespan=$lcm/($#colcont+1);  
   
                     # for each item I wish to print on this row...  
                     for ($j=0;$j<=$#colcont;$j++) {  
                         my $indent;my $indentstr;  
                         my $linkid;  
                         my $rid=$colcont[$j];  
                         $rid=~/(\d+)\.(\d+)$/;  
                         my $src=  
                            &Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});  
                         my $symb=  
           &Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.$src;  
                         my $add='<td>';  
                         my $adde='</td>';  
                         my $hwk='<font color="#223322">';  
                         my $hwke='</font>';  
                         if ($rid=~/^l(\d+\.\d+),(.+)/) { $linkid=$1; $rid=$2; }  
                         if ($rid=~/^i(\d+),(.+)/) { $indent=$1; $rid=$2; }  
                         if ($rid=~/^h(.+)/) {  
                             $rid=$1;  
                             $add='<th bgcolor="#AAFF55"><a name="'.$rid.'">';  
                             $adde='</th>';  
                             if (($ENV{'user.adv'}) &&   
                                 ($parmhash{$symb.'.0.parameter_randompick'})) {  
                                $adde=' (randomly select '.  
                                    $parmhash{$symb.'.0.parameter_randompick'}.  
                                    ')</th>';  
                             }  
                         }  
                         if ($rid=~/^j(.+)/) { $rid=$1; }  
                         if ($rid=~/^p(\d)(\d)\"([\w\: \(\)\/\,]*)\"(.+)/) {  
                             # sub astatus describes what code/tcode mean  
                             my $code=$1;  
                             my $tcode=$2;  
                             my $ctext=$3;  
                             $rid=$4;  
                               
                             # will open later  
                             if ($tcode eq '1') {   
                                 $add='<td bgcolor="#AAAAAA">';  
                             }  
   
                             # solved/correct  
                             if ($code eq '3') {  
                                 $add='<td bgcolor="#AAFFAA">';  
                             } elsif ($code eq '4') { # partially correct  
                                 $add='<td bgcolor="#E0FFAA">';  
                             } else {  
                                 # not attempted  
                                   
                                 # we end up here on network failure, so pick a neutral  
                                 # color if the network failed instead of bright red.  
                                 if ( $networkFailedFlag )  
                                 {  
                                     $add = '<td bgcolor="#AAAAAA">';  
                                 }  
                                 else  
                                 {  
                                     $add='<td bgcolor="#FFAAAA">';  
                                 }  
   
                                 if ($tcode eq '2') { # open, not past due  
                                     $add='<td bgcolor="#FFFFAA">';  
                                 }  
   
                                 if ($tcode eq '4') { # due in next 24 hours  
                                     $add='<td bgcolor="#FFFF33">';  
                                     $adde='</td>';  
                                 }  
                             }  
                             $hwk='<font color="#888811"><b>';  
                             $hwke='</b></font>';  
                             if ($code eq '1') {  
                                 $hwke='</b> ('.$ctext.')</font>';  
                             }  
                             if ($code eq '2' || $code eq '4') {  
                                 $hwk='<font color="#992222"><b>';  
                                 $hwke='</b> ('.$ctext.')</font>';  
                             }  
                             if ($code eq '3') {  
                                 $hwk='<font color="#229922"><b>';  
                                 $hwke='</b> ('.$ctext.')</font>';  
                             }  
                             if ($networkFailedFlag)   
                             {  
                                 $hwke='</b> (status unavailable)</font>';  
                             }  
                         }  
                         if ($rid && $hash{'src_'.$rid} eq $currenturl) {  
                             $add=$add.'<a name="curloc"></a>'.  
                                 '<font color=red size=+2><b>&gt; </b></font>';  
                             $adde=  
                                 '<font color=red size=+2><b> &lt;</b></font>'.$adde;  
                         }  
                         if ($discussiontimes{$symb}>$lastcheck) {  
                             $adde=  
                                 '<img border=0 src="/adm/lonMisc/chat.gif">'.  
                                     $adde;  
                         }  
                         if ($error{$src}) {  
                             foreach (split(/\,/,$error{$src})) {  
                                 if ($_) {  
                                     $adde=  
                                         '&nbsp;<a href="/adm/email?display='.  
                                             &Apache::lonnet::escape($_).  
                                                 '"><img src="/adm/lonMisc/bomb.gif" border=0></a>'  
                                                     .$adde;  
                                 }  
                             }  
                         }  
                         if ($feedback{$src}) {  
                             foreach (split(/\,/,$feedback{$src})) {  
                                 if ($_) {  
                                     $adde=  
                                         '&nbsp;<a href="/adm/email?display='.  
                                             &Apache::lonnet::escape($_).  
                                                 '"><img src="/adm/lonMisc/feedback.gif" border=0></a>'  
                                                     .$adde;  
                                 }  
                             }  
                         }  
                         if ($indent) {  
                             my $is="&nbsp;&nbsp;";  
                             for(my $i=-1;$i<$indent;$i++) { $indentstr.=$is; }  
                         }  
                         if (!$linkid) { $linkid=$rid; }  
                         if ($hash{'randomout_'.$rid}) {  
                             $adde=' <i>(hidden)</i>'.$adde;  
                         }  
                         $r->print($add.$indentstr);  
                         if ($rid) {  
                             $r->print('<a href="'.$hash{'src_'.$linkid}.  
                                       (($hash{'src_'.$linkid}=~/\?/)?'&':'?').  
                                       'symb='.&Apache::lonnet::escape($symb)  
                                        .'">'.  
                                       $hwk.$hash{'title_'.$rid}.$hwke.'</a>');  
                         }  
                         $r->print($adde);  
                     }  
                     $r->print('</tr>');  
                 }  
             }  
             $r->print("\n</table>");  
             $r->print('</body></html>');  
 # -------------------------------------------------------------------- End page  
         }                    
 # ------------------------------------------------------------- End render page  
     }  
 # ------------------------------------------------------------------ Untie hash  
     unless (untie(%hash)) {  
         &Apache::lonnet::logthis("<font color=blue>WARNING: ".  
                                  "Could not untie coursemap $fn (browse).</font>");   
     }  
     unless (untie(%parmhash)) {  
         &Apache::lonnet::logthis("<font color=blue>WARNING: ".  
                                  "Could not untie parmhash (browse).</font>");   
     }  
     return OK;  
 }  }
   
 sub new_handle {  sub real_handler {
     my $r = shift;      my $r = shift;
   
       &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
   
     # Handle header-only request      # Handle header-only request
     if ($r->header_only) {      if ($r->header_only) {
         if ($ENV{'browser.mathml'}) {          if ($ENV{'browser.mathml'}) {
Line 820  sub new_handle { Line 94  sub new_handle {
     &Apache::loncommon::no_cache($r);      &Apache::loncommon::no_cache($r);
     $r->send_http_header;      $r->send_http_header;
   
     # Initialize the nav map      # Create the nav map
     my $navmap = Apache::lonnavmaps::navmap->new(      my $navmap = Apache::lonnavmaps::navmap->new(
                         $ENV{"request.course.fn"}.".db",                          $ENV{"request.course.fn"}.".db",
                         $ENV{"request.course.fn"}."_parms.db", 1, 1);                          $ENV{"request.course.fn"}."_parms.db", 1, 1);
Line 832  sub new_handle { Line 106  sub new_handle {
         return HTTP_NOT_ACCEPTABLE;          return HTTP_NOT_ACCEPTABLE;
     }      }
   
       $r->print("<html><head>\n");
       $r->print("<title>Navigate Course Contents</title></head>");
   
     # Header      # Header
     $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',      $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
                                           ''));                                            ''));
     $r->print('<script>window.focus();</script>');      $r->print('<script>window.focus();</script>');
     my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};  
     if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }  
     my $date=localtime;  
     $r->print("<h3>$date</h3>\n");  
     $r->rflush();      $r->rflush();
   
       # Now that we've displayed some stuff to the user, init the navmap
       $navmap->init();
   
       $r->print('<table border="0" cellpadding="2" cellspacing="0">');
       my $date=localtime;
       $r->print('<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>');
   
       # Print discussions and feedback header
     if ($navmap->{LAST_CHECK}) {      if ($navmap->{LAST_CHECK}) {
         $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.          $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.
                     '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
                   strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).                    strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>');                     '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
                     '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
                     '</td>'); 
       } else {
           $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.
                     '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
                     '&nbsp;&nbsp;<img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
                     '</td>'); 
       }
       $r->print('</tr></table>');
   
       my $condition = 0;
       if ($ENV{'form.condition'}) {
           $condition = 1;
       }
   
       # Determine where the "here" marker is and where the screen jumps to.
       my $SYMB = 1; my $URL = 2; my $NOTHING = 3; # symbolic constants
       my $hereType; # the type of marker, $SYMB, $URL, or $NOTHING
       my $here; # the actual URL or SYMB for the here marker
       my $jumpType; # The type of the thing we have a jump for, $SYMB or $URL
       my $jump; # the SYMB/URL of the resource we need to jump to
   
       if ( $ENV{'form.alreadyHere'} ) { # we came from a user's manipulation of the nav page
           # If this is a click on a folder or something, we want to preserve the "here"
           # from the querystring, and get the new "jump" marker
           $hereType = $ENV{'form.hereType'};
           $here = $ENV{'form.here'};
           $jumpType = $ENV{'form.jumpType'} || $NOTHING;
           $jump = $ENV{'form.jump'};
       } else { # the user is visiting the nav map from the remote
           # We're coming from the remote. We have either a url, a symb, or nothing,
           # and we need to figure out what.
           # Preference: Symb
           
           if ($ENV{'form.symb'}) {
               $hereType = $jumpType = $SYMB;
               $here = $jump = $ENV{'form.symb'};
           } elsif ($ENV{'form.postdata'}) {
               # couldn't find a symb, is there a URL?
               my $currenturl = $ENV{'form.postdata'};
               $currenturl=~s/^http\:\/\///;
               $currenturl=~s/^[^\/]+//;
   
               $hereType = $jumpType = $URL;
               $here = $jump = $currenturl;
           } else {
               # Nothing
               $hereType = $jumpType = $NOTHING;
           }
       }
   
       
       # alreadyHere allows us to only open the maps necessary to view
       # the current location once, while at the same time remembering
       # the current location. Without that check, the user would never
       # be able to close those maps; the user would close it, and the
       # currenturl scan would re-open it.
       my $queryAdd = "&alreadyHere=1";
   
       if ($condition) {
           $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd" .
                     "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
                     "\">Close All Folders</a>");
     } else {      } else {
         $r->print('<img src="/adm/lonMisc/chat.gif"> Discussions'.          $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd" .
                   '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>');                     "&hereType=$hereType&here=" . Apache::lonnet::escape($here) . 
                     "\">Open All Folders</a>");
     }      }
     #if (($currenturl=~/^\/res/) &&  
     #    ($currenturl!~/^\/res\/adm/)) {      $r->print('<br>&nbsp;');
     #    $r->print('<a href="#curloc">Current Location</a><p>');      $r->rflush();
     #}  
   
     # Check that it's defined      # Check that it's defined
     if (!($navmap->courseMapDefined())) {      if (!($navmap->courseMapDefined())) {
Line 865  sub new_handle { Line 212  sub new_handle {
     # is technically not proper, but should be harmless      # is technically not proper, but should be harmless
     my $res = $navmap->firstResource();      my $res = $navmap->firstResource();
   
       # These are some data tables, which make it easy to change some of
       # of the specific visualization parameters if desired.
   
     # Defines a status->color mapping, null string means don't color      # Defines a status->color mapping, null string means don't color
     my %colormap =       my %colormap = 
     ( $res->NETWORK_FAILURE        => '',      ( $res->NETWORK_FAILURE        => '',
       $res->CORRECT                => '',        $res->CORRECT                => '',
       $res->EXCUSED                => '#BBBBFF',        $res->EXCUSED                => '#3333FF',
       $res->PAST_DUE_ANSWER_LATER  => '',        $res->PAST_DUE_ANSWER_LATER  => '',
       $res->PAST_DUE_NO_ANSWER     => '',        $res->PAST_DUE_NO_ANSWER     => '',
       $res->ANSWER_OPEN            => '#CCFFCC',        $res->ANSWER_OPEN            => '#006600',
       $res->OPEN_LATER             => '',        $res->OPEN_LATER             => '',
       $res->TRIES_LEFT             => '',        $res->TRIES_LEFT             => '',
       $res->INCORRECT              => '',        $res->INCORRECT              => '',
Line 880  sub new_handle { Line 230  sub new_handle {
       $res->NOTHING_SET            => ''        );        $res->NOTHING_SET            => ''        );
     # And a special case in the nav map; what to do when the assignment      # And a special case in the nav map; what to do when the assignment
     # is not yet done and due in less then 24 hours      # is not yet done and due in less then 24 hours
     my $hurryUpColor = "#FFCCCC";      my $hurryUpColor = "#FF0000";
   
       # Keep these mappings in sync with lonquickgrades, which uses the colors
       # instead of the icons.
     my %statusIconMap =       my %statusIconMap = 
         ( $res->NETWORK_FAILURE    => '',          ( $res->NETWORK_FAILURE    => '',
           $res->NOTHING_SET        => '',            $res->NOTHING_SET        => '',
Line 894  sub new_handle { Line 246  sub new_handle {
           $res->TRIES_LEFT         => 'navmap.open.gif',            $res->TRIES_LEFT         => 'navmap.open.gif',
           $res->INCORRECT          => 'navmap.wrong.gif',            $res->INCORRECT          => 'navmap.wrong.gif',
           $res->OPEN               => 'navmap.open.gif',            $res->OPEN               => 'navmap.open.gif',
           $res->ATTEMPTED          => '' );            $res->ATTEMPTED          => 'navmap.open.gif' );
   
     my %iconAltTags =       my %iconAltTags = 
         ( 'navmap.correct.gif' => 'Correct',          ( 'navmap.correct.gif' => 'Correct',
Line 914  sub new_handle { Line 266  sub new_handle {
         }          }
     }      }
   
     my $currenturl = $ENV{'form.postdata'};      # Is this a new-style course? If so, we want to suppress showing the top-level
     $currenturl=~s/^http\:\/\///;      # maps in their own folders, in favor of "inlining" them.
     $currenturl=~s/^[^\/]+//;      my $topResource = $navmap->getById("0.0");
     # alreadyHere allows us to only open the maps necessary to view  
     # the current location once, while at the same time remembering  
     # the current location. Without that check, the user would never  
     # be able to close those maps; the user would close it, and the  
     # currenturl scan would re-open it.  
     my $queryAdd = "postdata=" . &Apache::lonnet::escape($currenturl) .  
         "&alreadyHere=1";  
   
     $r->print('<a href="navmaps?condition=1&filter=">Show All Resources</a><br /><br />');  
   
     # Begin the HTML table      # Begin the HTML table
     # four cols: resource + indent, chat+feedback, icon, text string      # four cols: resource + indent, chat+feedback, icon, text string
     $r->print('<table cellspacing="3" cellpadding="0" bgcolor="#FFFFFF">' ."\n");      $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
   
     my $condition = 0;  
     if ($ENV{'form.condition'}) {  
         $condition = 1;  
     }  
   
     # This needs to be updated to use symbs from the remote,       # This needs to be updated to use symbs from the remote, 
     # instead of uris. The changes to this and the main rendering      # instead of uris. The changes to this and the main rendering
     # loop should be obvious.      # loop should be obvious.
     # Here's a simple example of the iterator.      # Here's a simple example of the iterator.
     # If there is a current resource      # Preprocess the map: Look for current URL, force inlined maps to display
     if ($currenturl && !$ENV{'form.alreadyHere'}) {  
         # Give me every resource...      my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
         my $mapIterator = $navmap->getIterator(undef, undef, {}, 1);      my $found = 0;
         my $found != 0;      my $depth = 1;
         my $depth = 1;      my $currentJumpIndex = 0; # keeps track of when the current resource is found,
         $mapIterator->next(); # discard the first BEGIN_MAP                               # so we can back up a few and put the anchor above the
         my $curRes = $mapIterator->next();                               # current resource
               my $currentJumpDelta = 2; # change this to change how many resources are displayed
         while ($depth > 0 && !$found) {                               # before the current resource when using #current
             if (ref($curRes) && $curRes->src() eq $currenturl) {      $mapIterator->next(); # discard the first BEGIN_MAP
                 # If this is the correct resource, be sure to       my $curRes = $mapIterator->next();
                 # show it by making sure the containing maps      my $counter = 0;
                 # are open.      my $foundJump = ($jumpType == $NOTHING); # look for jump point if we have one
       my $looped = 0; 
                 my $mapStack = $mapIterator->getStack();  
                 for my $map (@{$mapStack}) {      # We only need to do this if we need to open the maps to show the
                     if ($condition) {      # current position. This will change the counter so we can't count
                         undef $filterHash{$map->map_pc()};      # for the jump marker with this loop.
                     } else {      while ($depth > 0 && !$ENV{'form.alreadyHere'}) {
                         $filterHash{$map->map_pc()} = 1;          if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
                     }          if ($curRes == $mapIterator->END_MAP()) { $depth--; }
   
           if (ref($curRes) && !$ENV{'form.alreadyHere'} && 
               ($hereType == $SYMB && $curRes->symb() eq $here) ||
               (ref($curRes) && $hereType == $URL && $curRes->src() eq $here)) {
               my $mapStack = $mapIterator->getStack();
               
               # Ensure the parent maps are open
               for my $map (@{$mapStack}) {
                   if ($condition) {
                       undef $filterHash{$map->map_pc()};
                   } else {
                       $filterHash{$map->map_pc()} = 1;
                 }                  }
                 $found = 1;  
             }              }
             $curRes = $mapIterator->next();              $ENV{'form.alreadyHere'} = 1;
           }
           $looped = 1;
   
           $curRes = $mapIterator->next();
       }            
       
       $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
       $depth = 1;
       $mapIterator->next();
       $curRes = $mapIterator->next();
   
       while ($depth > 0 && !$foundJump) {
           if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
           if ($curRes == $mapIterator->END_MAP()) { $depth--; }
           if (ref($curRes)) { $counter++; }
   
           if (ref($curRes) && 
               (($jumpType == $SYMB && $curRes->symb() eq $jump) ||
               ($jumpType == $URL && $curRes->src() eq $jump))) {
               # If this is the correct resource, be sure to 
               # show it by making sure the containing maps
               # are open.
   
               # This is why we have to use the main iterator instead of the
               # potentially faster DFS: The count has to be the same, so
               # the order has to be the same, which DFS won't give us.
               $currentJumpIndex = $counter;
               $foundJump = 1;
         }          }
     }  
   
           $curRes = $mapIterator->next();
       }
       
     undef $res; # so we don't accidentally use it later      undef $res; # so we don't accidentally use it later
     my $indentLevel = 0;      my $indentLevel = 0;
     my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";      my $indentString = "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />";
   
     my $isNewBranch = 0;      my $isNewBranch = 0;
     my $now = time();      my $now = time();
     my $in24Hours = $now + 24 * 60 * 60;      my $in24Hours = $now + 24 * 60 * 60;
     my $depth = 1;  
     my $displayedHereMarker = 0;      my $displayedHereMarker = 0;
       my $displayedJumpMarker = 0;
       
     # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"      # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
     # code in iterator->next), so ignore the first one      # code in iterator->next), so ignore the first one
     my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,      $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
                                            $condition);                                             $condition);
     $mapIterator->next();      $mapIterator->next();
     my $curRes = $mapIterator->next();      $curRes = $mapIterator->next();
       $depth = 1;
   
       my @backgroundColors = ("#FFFFFF", "#F6F6F6");
       my $rowNum = 0;
   
       $counter = 0;
   
     while ($depth > 0) {      while ($depth > 0) {
         if ($curRes == $mapIterator->BEGIN_MAP() ||          if ($curRes == $mapIterator->BEGIN_MAP() ||
Line 998  sub new_handle { Line 383  sub new_handle {
         if ($curRes == $mapIterator->BEGIN_BRANCH()) {          if ($curRes == $mapIterator->BEGIN_BRANCH()) {
             $isNewBranch = 1;              $isNewBranch = 1;
         }          }
         if ($curRes == $mapIterator->BEGIN_MAP()) {          if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
             $depth++;          if ($curRes == $mapIterator->END_MAP()) { $depth--; }
         }  
         if ($curRes == $mapIterator->END_MAP()) {  
             $depth--;  
         }  
   
         # Is this resource being blotted out?          if (ref($curRes)) { $counter++; }
         if (ref($curRes) && !advancedUser() && $curRes->randomout()) {  
             $curRes = $mapIterator->next();          if (ref($curRes)) {
             next; # and totally ignore this resource  
         }  
   
         if (ref($curRes) && $curRes->src()) {              my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon
   
               if ($indentLevel - $deltalevel < 0) {
                   # If this would be at a negative depth (top-level maps in
                   # new-style courses, we want to suppress their title display)
                   # then ignore it.
                   $curRes = $mapIterator->next();
                   next;
               }
   
             # Step one: Decide which parts to show              # Step one: Decide which parts to show
             my @parts = @{$curRes->parts()};              my @parts = @{$curRes->parts()};
Line 1019  sub new_handle { Line 406  sub new_handle {
             my $condensed = 0;              my $condensed = 0;
                                   
             if ($curRes->is_problem()) {              if ($curRes->is_problem()) {
                 # Is it multipart?  
   
                   # Is it multipart?
                 if ($multipart) {                  if ($multipart) {
                     # If it's multipart, see if part 0 is "open"                      # If it's multipart, see if part 0 is "open"
                     # if it is, display all parts, if it isn't,                      # if it is, display all parts, if it isn't,
                     # just display first                      # just display first
                     if (!$curRes->opendate("0")) {                      if (!$curRes->opendate("0")) {
                         @parts = ("0"); # just display the zero-th part                          # no parts are open, display as one part
                           @parts = ("0");
                         $condensed = 1;                          $condensed = 1;
                     } else {                      } else {
                         # Otherwise, only display part 0 if we want to                           # Otherwise, only display part 0 if we want to 
                         # attach feedback or email information to it                          # attach feedback or email information to it
                         if ($curRes->hasDiscussion() || $curRes->getFeedback()) {                          if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
                               # Is this right? I think this will toss it
                               # if it DOES have discussion, not if it doesn't?
                               # - Jeremy (yes, commenting on his own code)
                             shift @parts;                              shift @parts;
                         } else {                          } else {
                             # If there's discussion or feedback, that counts  
                             # as a difference, so display the parts.  
                               
                             # Now, we decide whether to condense the                              # Now, we decide whether to condense the
                             # parts due to similarity                              # parts due to similarity
                             my $status = $curRes->status($parts[1]);                              my $status = $curRes->status($parts[1]);
Line 1057  sub new_handle { Line 445  sub new_handle {
                                 }                                  }
                             }                              }
                                                           
                             # $allSame is true if all the statuses were                              # $*allSame is true if all the statuses were
                             # the same. Now, if they are all the same and                              # the same. Now, if they are all the same and
                             # match one of the statuses to condense, or they                              # match one of the statuses to condense, or they
                             # are all open with the same due date, or they are                              # are all open with the same due date, or they are
Line 1075  sub new_handle { Line 463  sub new_handle {
                 }                  }
   
             } else {              } else {
                 @parts[0] = "0"; # this is to get past foreach loop below                  $parts[0] = "0"; # this is to get past foreach loop below
                  # you can consider a non-problem resource as a resource                   # you can consider a non-problem resource as a resource
                   # with only one part without loss                    # with only one part without loss, and it simplifies the looping
               }
   
               # Is it a multipart problem with a single part, now in 
               # @parts with "0" filtered out? If so, 'forget' it's a multi-part
               # problem and treat it like a single-part problem.
               if ( scalar(@parts) == 1 ) {
                   $multipart = 0;
             }              }
   
             # Display one part, in event of network error.              # Display one part, in event of network error.
             # If this is a single part, we can at least show the correct              # If this is a single part, we can at least show the correct
             # status, but if it's multipart, we're lost.              # status, but if it's multipart, we're lost, since we can't
               # retreive the metadata to count the parts
             if ($curRes->{RESOURCE_ERROR}) {              if ($curRes->{RESOURCE_ERROR}) {
                 @parts = ("0");                  @parts = ("0");
             }              }
   
             # Step two: Show the parts              # Step Two: Print the actual data.
   
               # For each part we intend to display...
             foreach my $part (@parts) {              foreach my $part (@parts) {
   
                 my $deltalevel = 0; # for inserting the branch icon  
                 my $nonLinkedText = ""; # unlinked stuff after title                  my $nonLinkedText = ""; # unlinked stuff after title
                                   
                 # For each thing we're displaying...  
   
                 my $stack = $mapIterator->getStack();                  my $stack = $mapIterator->getStack();
                 my $src = getLinkForResource($stack);                  my $src = getLinkForResource($stack);
   
                   # Pass the correct symb on the querystring, so the
                   # remote will figure out where we are if we click a link
                 my $srcHasQuestion = $src =~ /\?/;                  my $srcHasQuestion = $src =~ /\?/;
                 my $link = $src.                  my $link = $src.
                     ($srcHasQuestion?'&':'?') .                      ($srcHasQuestion?'&':'?') .
                     'symb='.&Apache::lonnet::escape($curRes->symb()).                      'symb='.&Apache::lonnet::escape($curRes->symb()).
                     '"';                      '"';
                 my $title = $curRes->title();  
                 if (!$title) {                  my $title = $curRes->compTitle();
                     $title = $curRes->src();                  if ($src=~/^\/uploaded\//) {
                     $title = substr ($title, rindex($title, "/") + 1);      $nonLinkedText=$title;
                       $title='';
                 }                  }
                 my $partLabel = "";                  my $partLabel = "";
                 my $newBranchText = "";                  my $newBranchText = "";
   
                 # If this is a new branch, label it so                  # If this is a new branch, label it so
                 # (temporary, this should be an icon w/ alt text)  
                 if ($isNewBranch) {                  if ($isNewBranch) {
                     $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";                      $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
                     $isNewBranch = 0;                      $isNewBranch = 0;
                     $deltalevel = 1;  
                 }                  }
   
                 # links to open and close the folders                  # links to open and close the folders
Line 1144  sub new_handle { Line 540  sub new_handle {
                     $linkopen .= ($nowOpen xor $condition) ?                       $linkopen .= ($nowOpen xor $condition) ? 
                         addToFilter(\%filterHash, $mapId) :                          addToFilter(\%filterHash, $mapId) :
                         removeFromFilter(\%filterHash, $mapId);                          removeFromFilter(\%filterHash, $mapId);
                     $linkopen .= "&condition=$condition&$queryAdd\">";                      $linkopen .= "&condition=$condition&$queryAdd" . 
                           "&hereType=$hereType&here=" . 
                           Apache::lonnet::escape($here) . "&jumpType=$SYMB&" .
                           "jump=" . Apache::lonnet::escape($curRes->symb()) ."\">";
                     $linkclose = "</a>";                      $linkclose = "</a>";
   
                 }                  }
                                   
                 my $colorizer = "";                  my $colorizer = "";
                   my $color;
                 if ($curRes->is_problem()) {                  if ($curRes->is_problem()) {
                     my $status = $curRes->status($part);                      $color = $colormap{$curRes->status};
                     my $color = $colormap{$status};  
   
                     # Special case in the navmaps: If in less then                      if (dueInLessThen24Hours($curRes, $part) ||
                     # 24 hours, give it a bit of urgency                          lastTry($curRes, $part)) {
                     if ($status == $curRes->OPEN() && $curRes->duedate() &&  
                         $curRes->duedate() < time()+(24*60*60) &&   
                         $curRes->duedate() > time()) {  
                         $color = $hurryUpColor;  
                     }  
                     # Special case: If this is the last try, and there is  
                     # more then one available, give a bit of urgency  
                     my $tries = $curRes->tries($part);  
                     my $maxtries = $curRes->maxtries($part);  
                     if ($tries && $maxtries && $maxtries > 1 &&  
                         $maxtries - $tries == 1) {  
                         $color = $hurryUpColor;                          $color = $hurryUpColor;
                     }                      }
   
                     if ($color ne "") {                      if ($color ne "") {
                         $colorizer = "bgcolor=\"$color\"";                          $colorizer = "bgcolor=\"$color\"";
                     }                      }
Line 1178  sub new_handle { Line 567  sub new_handle {
                     $nonLinkedText .= ' <i>(hidden)</i> ';                      $nonLinkedText .= ' <i>(hidden)</i> ';
                 }                  }
   
                 # FIRST COL: The resource indentation, branch icon, and name                  $rowNum++;
                 $r->print("  <tr><td align=\"left\" valign=\"center\">\n");                  my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
   
                   # FIRST COL: The resource indentation, branch icon, name, and anchor
                   $r->print("  <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\">\n");
   
                   # Print the anchor if necessary
                   if ($counter == $currentJumpIndex - $currentJumpDelta ) {
                       $r->print('<a name="curloc" />');
                       $displayedJumpMarker = 1;
                   }
   
                 # print indentation                  # print indentation
                 for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {                  for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
Line 1192  sub new_handle { Line 590  sub new_handle {
                 my $curMarkerEnd = "";                  my $curMarkerEnd = "";
   
                 # Is this the current resource?                  # Is this the current resource?
                 if ($curRes->src() eq $currenturl && !$displayedHereMarker) {                  if (!$displayedHereMarker && 
                     $curMarkerBegin = '<a name="curloc" /><font color="red" size="+2">&gt; </font>';                      (($hereType == $SYMB && $curRes->symb eq $here) ||
                       ($hereType == $URL && $curRes->src eq $here))) {
                       $curMarkerBegin = '<font color="red" size="+2">&gt; </font>';
                     $curMarkerEnd = '<font color="red" size="+2"> &lt;</font>';                      $curMarkerEnd = '<font color="red" size="+2"> &lt;</font>';
                     $displayedHereMarker = 1;                      $displayedHereMarker = 1;
                 }                  }
Line 1202  sub new_handle { Line 602  sub new_handle {
                     $partLabel = " (Part $part)";                       $partLabel = " (Part $part)"; 
                     $title = "";                      $title = "";
                 }                  }
                 if ($multipart && $condensed && $curRes->countParts > 1) {                  if ($multipart && $condensed) {
                     $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';                      $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
                 }                  }
   
                 $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");                  $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
   
                 if ($curRes->{RESOURCE_ERROR}) {                  #if ($curRes->{RESOURCE_ERROR}) {
                     $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",                  #    $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
                                                   '<font size="-1">Host down</font>'));                  #                              '<font size="-1">Host down</font>'));
                     }                  #    }
   
                   $r->print("</td>\n");
   
                 my $discussionHTML = ""; my $feedbackHTML = "";                  # SECOND COL: Is there text, feedback, errors??
                   my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
   
                 # SECOND COL: Is there text or feedback?  
                 if ($curRes->hasDiscussion()) {                  if ($curRes->hasDiscussion()) {
                     $discussionHTML = $linkopen .                      $discussionHTML = $linkopen .
                         '<img border="0" src="/adm/lonMisc/chat.gif" />' .                          '<img border="0" src="/adm/lonMisc/chat.gif" />' .
Line 1234  sub new_handle { Line 636  sub new_handle {
                     }                      }
                 }                  }
   
                 $r->print("<td align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML</td>");                  if ($curRes->getErrors()) {
                       my $errors = $curRes->getErrors();
                       foreach (split(/,/, $errors)) {
                           if ($_) {
                               $errorHTML .= '&nbsp;<a href="/adm/email?display='
                                   . &Apache::lonnet::escape($_) . '">'
                                   . '<img src="/adm/lonMisc/bomb.gif" '
                                   . 'border="0" /></a>';
                           }
                       }
                   }
   
                   $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>");
   
                 # Is this the first displayed part of a multi-part problem                  # Is this the first displayed part of a multi-part problem
                 # that has not been condensed, so we should suppress these two                  # that has not been condensed, so we should suppress these two
                 # columns?                  # columns so we don't display useless status info about part
                   # "0"?
                 my $firstDisplayed = !$condensed && $multipart && $part eq "0";                  my $firstDisplayed = !$condensed && $multipart && $part eq "0";
   
                 # THIRD COL: Problem status icon                  # THIRD COL: Problem status icon
Line 1247  sub new_handle { Line 662  sub new_handle {
                     my $icon = $statusIconMap{$curRes->status($part)};                      my $icon = $statusIconMap{$curRes->status($part)};
                     my $alt = $iconAltTags{$icon};                      my $alt = $iconAltTags{$icon};
                     if ($icon) {                      if ($icon) {
                         $r->print("<td valign=\"center\" width=\"50\" align=\"right\">$linkopen<img src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");                          $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
                     } else {                      } else {
                         $r->print("<td></td>\n");                          $r->print("<td width=\"30\">&nbsp;</td>\n");
                     }                      }
                 } else { # not problem, no icon                  } else { # not problem, no icon
                     $r->print("<td></td>\n");                      $r->print("<td width=\"30\">&nbsp;</td>\n");
                 }                  }
   
                 # FOURTH COL: Text description                  # FOURTH COL: Text description
                 $r->print("<td $colorizer align=\"right\" valign=\"center\">\n");                  $r->print("<td align=\"right\" valign=\"center\">\n");
                                   
                 if ($curRes->kind() eq "res" &&                  if ($curRes->kind() eq "res" &&
                     $curRes->is_problem() &&                      $curRes->is_problem() &&
                     !$firstDisplayed) {                      !$firstDisplayed) {
                       $r->print ("<font color=\"$color\"><b>") if ($color);
                     $r->print (getDescription($curRes, $part));                      $r->print (getDescription($curRes, $part));
                       $r->print ("</b></font>") if ($color);
                 }                  }
                 if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {                  if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
                     $r->print('(randomly select ' . $curRes->randompick() .')');                      $r->print('(randomly select ' . $curRes->randompick() .')');
                 }                  }
   
                 $r->print("</td></tr>\n");                  $r->print("&nbsp;</td></tr>\n");
   
                   if (!($counter % 20)) { $r->rflush(); }
                   if ($counter == 2) { $r->rflush(); }
             }              }
         }          }
         $curRes = $mapIterator->next();          $curRes = $mapIterator->next();
     }      }
   
     $r->print("</table></body></html>");      $r->print("</table>");
   
       # Print out the part that jumps to #curloc if it exists
       if ($displayedJumpMarker) {
           $r->print('<script>location += "#curloc";</script>');
       }
   
     $navmap->untieHashes();      $navmap->untieHashes();
   
       $r->print("</body></html>");
   
     return OK;      return OK;
 }  }
   
Line 1385  sub getDescription { Line 812  sub getDescription {
     }      }
 }  }
   
   # Convenience function, so others can use it: Is the problem due in less then
   # 24 hours, and still can be done?
   
   sub dueInLessThen24Hours {
       my $res = shift;
       my $part = shift;
       my $status = $res->status($part);
   
       return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
               $status == $res->TRIES_LEFT()) &&
              $res->duedate() && $res->duedate() < time()+(24*60*60) &&
              $res->duedate() > time();
   }
   
   # Convenience function, so others can use it: Is there only one try remaining for the
   # part, with more then one try to begin with, not due yet and still can be done?
   sub lastTry {
       my $res = shift;
       my $part = shift;
   
       my $tries = $res->tries($part);
       my $maxtries = $res->maxtries($part);
       return $tries && $maxtries && $maxtries > 1 &&
           $maxtries - $tries == 1 && $res->duedate() &&
           $res->duedate() > time();
   }
   
   # This puts a human-readable name on the ENV variable.
 sub advancedUser {  sub advancedUser {
     return $ENV{'user.adv'};      return $ENV{'user.adv'};
 }  }
Line 1430  sub timeToHumanString { Line 885  sub timeToHumanString {
         $delta = -$delta;          $delta = -$delta;
     }      }
   
     # Is it in the future?  
     if ( $delta > 0 ) {      if ( $delta > 0 ) {
         # Is it less then a minute away?  
         my $tense = $inPast ? " ago" : "";          my $tense = $inPast ? " ago" : "";
         my $prefix = $inPast ? "" : "in ";          my $prefix = $inPast ? "" : "in ";
           
           # Less then a minute
         if ( $delta < $minute ) {          if ( $delta < $minute ) {
             if ($delta == 1) { return "${prefix}1 second$tense"; }              if ($delta == 1) { return "${prefix}1 second$tense"; }
             return "$prefix$delta seconds$tense";              return "$prefix$delta seconds$tense";
         }          }
   
         # Is it less then an hour away?          # Less then an hour
         if ( $delta < $hour ) {          if ( $delta < $hour ) {
             # If so, use minutes              # If so, use minutes
             my $minutes = floor($delta / 60);              my $minutes = floor($delta / 60);
Line 1470  sub timeToHumanString { Line 926  sub timeToHumanString {
         # Less then 5 days away, display day of the week and          # Less then 5 days away, display day of the week and
         # HH:MM          # HH:MM
         if ( $delta < $day * 5 ) {          if ( $delta < $day * 5 ) {
             my $timeStr = strftime("%A at %I:%M %P", localtime($time));              my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
             $timeStr =~ s/12:00 am/midnight/;              $timeStr =~ s/12:00 am/midnight/;
             $timeStr =~ s/12:00 pm/noon/;              $timeStr =~ s/12:00 pm/noon/;
             return ($inPast ? "last " : "next ") .              return ($inPast ? "last " : "next ") .
Line 1500  package Apache::lonnavmaps::navmap; Line 956  package Apache::lonnavmaps::navmap;
   
 =pod  =pod
   
 lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.  lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, the Apache handler for the "Navigation Map" button, and a flexible prepared renderer for navigation maps that are easy to use anywhere.
   
 =head1 navmap object: Encapsulating the compiled nav map  =head1 navmap object: Encapsulating the compiled nav map
   
Line 1534  sub new { Line 990  sub new {
     $self->{GENERATE_COURSE_USER_OPT} = shift;      $self->{GENERATE_COURSE_USER_OPT} = shift;
     $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;      $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
   
     # Resource cache stores navmapresource's as we reference them. We generate      # Resource cache stores navmap resources as we reference them. We generate
     # them on-demand so we don't pay for creating resources unless we use them.      # them on-demand so we don't pay for creating resources unless we use them.
     $self->{RESOURCE_CACHE} = {};      $self->{RESOURCE_CACHE} = {};
   
Line 1543  sub new { Line 999  sub new {
     $self->{NETWORK_FAILURE} = 0;      $self->{NETWORK_FAILURE} = 0;
   
     # tie the nav hash      # tie the nav hash
     my %navmaphash;  
     if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},      if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
               &GDBM_READER(), 0640))) {                &GDBM_READER(), 0640))) {
         return undef;          return undef;
     }      }
     $self->{NAV_HASH} = \%navmaphash;  
           
     my %parmhash;  
     if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},      if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
               &GDBM_READER(), 0640)))                &GDBM_READER(), 0640)))
     {      {
         untie $self->{PARM_HASH};          untie $self->{PARM_HASH};
         return undef;          return undef;
     }      }
     $self->{PARM_HASH} = \%parmhash;  
     $self->{HASH_TIED} = 1;      $self->{HASH_TIED} = 1;
       $self->{NAV_HASH} = \%navmaphash;
       $self->{PARM_HASH} = \%parmhash;
   
       bless($self);
           
       return $self;
   }
   
   sub init {
       my $self = shift;
   
     # If the course opt hash and the user opt hash should be generated,      # If the course opt hash and the user opt hash should be generated,
     # generate them      # generate them
Line 1572  sub new { Line 1036  sub new {
                   
         my $userprefix=$uname.'_'.$udom.'_';          my $userprefix=$uname.'_'.$udom.'_';
                   
         my %courserdatas; my %useropt; my %courseopt;          my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
         unless ($uhome eq 'no_host') {           unless ($uhome eq 'no_host') { 
 # ------------------------------------------------- Get coursedata (if present)  # ------------------------------------------------- Get coursedata (if present)
             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {              unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
Line 1623  sub new { Line 1087  sub new {
         my %emailstatus = &Apache::lonnet::dump('email_status');          my %emailstatus = &Apache::lonnet::dump('email_status');
         my $logoutTime = $emailstatus{'logout'};          my $logoutTime = $emailstatus{'logout'};
         my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};          my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
         $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?          $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
                                $courseLeaveTime : $logoutTime);                                 $courseLeaveTime : $logoutTime);
         my %discussiontime = &Apache::lonnet::dump('discussiontimes',           my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                                                    $cdom, $cnum);                                                     $cdom, $cnum);
Line 1662  sub new { Line 1126  sub new {
         $self->{EMAIL_STATUS} = \%emailstatus;          $self->{EMAIL_STATUS} = \%emailstatus;
                   
     }          }    
       
     bless($self);      $self->{PARM_CACHE} = {};
           }
     return $self;  
   # Internal function: Takes a key to look up in the nav hash and implements internal
   # memory caching of that key.
   sub navhash {
       my $self = shift; my $key = shift;
       return $self->{NAV_HASH}->{$key};
 }  }
   
 # Checks to see if coursemap is defined, matching test in old lonnavmaps  # Checks to see if coursemap is defined, matching test in old lonnavmaps
Line 1673  sub courseMapDefined { Line 1142  sub courseMapDefined {
     my $self = shift;      my $self = shift;
     my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});      my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
   
     my $firstres = $self->{NAV_HASH}->{"map_start_$uri"};      my $firstres = $self->navhash("map_start_$uri");
     my $lastres = $self->{NAV_HASH}->{"map_finish_$uri"};      my $lastres = $self->navhash("map_finish_$uri");
     return $firstres && $lastres;      return $firstres && $lastres;
 }  }
   
Line 1699  sub DESTROY { Line 1168  sub DESTROY {
     $self->untieHashes();      $self->untieHashes();
 }  }
   
 # Private function: Does the given resource (as a symb string) have  # Private method: Does the given resource (as a symb string) have
 # current discussion? Returns 0 if chat/mail data not extracted.  # current discussion? Returns 0 if chat/mail data not extracted.
 sub hasDiscussion {  sub hasDiscussion {
     my $self = shift;      my $self = shift;
     my $symb = shift;      my $symb = shift;
     if (!defined($self->{DISCUSSION_TIME})) { return 0; }      if (!defined($self->{DISCUSSION_TIME})) { return 0; }
   
       #return defined($self->{DISCUSSION_TIME}->{$symb});
     return $self->{DISCUSSION_TIME}->{$symb} >      return $self->{DISCUSSION_TIME}->{$symb} >
            $self->{LAST_CHECK};             $self->{LAST_CHECK};
 }  }
   
 # Private function: Does the given resource (as a symb string) have  # Private method: Does the given resource (as a symb string) have
 # current feedback? Returns the string in the feedback hash, which  # current feedback? Returns the string in the feedback hash, which
 # will be false if it does not exist.  # will be false if it does not exist.
 sub getFeedback {   sub getFeedback { 
Line 1722  sub getFeedback { Line 1192  sub getFeedback {
     return $self->{FEEDBACK}->{$symb};      return $self->{FEEDBACK}->{$symb};
 }  }
   
   # Private method: Get the errors for that resource (by source).
   sub getErrors { 
       my $self = shift;
       my $src = shift;
       
       if (!defined($self->{ERROR_MSG})) { return ""; }
       return $self->{ERROR_MSG}->{$src};
   }
   
 =pod  =pod
   
 =item * B<getById>(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object.  =item * B<getById>(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object.
Line 1754  sub getById { Line 1233  sub getById {
   
 sub firstResource {  sub firstResource {
     my $self = shift;      my $self = shift;
     my $firstResource = $self->{NAV_HASH}->{'map_start_' .      my $firstResource = $self->navhash('map_start_' .
                      &Apache::lonnet::clutter($ENV{'request.course.uri'})};                       &Apache::lonnet::clutter($ENV{'request.course.uri'}));
     return $self->getById($firstResource);      return $self->getById($firstResource);
 }  }
   
Line 1767  sub firstResource { Line 1246  sub firstResource {
   
 sub finishResource {  sub finishResource {
     my $self = shift;      my $self = shift;
     my $firstResource = $self->{NAV_HASH}->{'map_finish_' .      my $firstResource = $self->navhash('map_finish_' .
                      &Apache::lonnet::clutter($ENV{'request.course.uri'})};                       &Apache::lonnet::clutter($ENV{'request.course.uri'}));
     return $self->getById($firstResource);      return $self->getById($firstResource);
 }  }
   
 # -------------------------------------------- Figure out a cascading parameter  # Parmval reads the parm hash and cascades the lookups. parmval_real does
 #  # the actual lookup; parmval caches the results.
 # For this function to work  
 #  
 # * parmhash needs to be tied  
 # * courseopt and useropt need to be initialized for this user and course  
 #  
   
 sub parmval {  sub parmval {
     my $self = shift;      my $self = shift;
     my ($what,$symb)=@_;      my ($what,$symb)=@_;
       my $hashkey = $what."|||".$symb;
   
       if (defined($self->{PARM_CACHE}->{$hashkey})) {
           return $self->{PARM_CACHE}->{$hashkey};
       }
   
       my $result = $self->parmval_real($what, $symb);
       $self->{PARM_CACHE}->{$hashkey} = $result;
       return $result;
   }
   
   sub parmval_real {
       my $self = shift;
       my ($what,$symb) = @_;
   
     my $cid=$ENV{'request.course.id'};      my $cid=$ENV{'request.course.id'};
     my $csec=$ENV{'request.course.sec'};      my $csec=$ENV{'request.course.sec'};
     my $uname=$ENV{'user.name'};      my $uname=$ENV{'user.name'};
Line 1864  sub parmval { Line 1352  sub parmval {
   
 1;  1;
   
 package Apache::lonnavmaps::iterator;  package Apache::lonnavmaps::renderer;
   
   =pod
   
   =head1 navmap renderer
   
   The navmaprenderer package provides a sophisticated rendering of the standard navigation maps interface into HTML. The provided nav map handler is actually just a glorified call to this. 
   
   Because of the large number of parameters this function presents, instead of passing it arguments as is normal, pass it in an anonymous hash with the given options. This is because there is no obvious order you may wish to override these in and a hash is easier to read and understand then "undef, undef, undef, 1, undef, undef, renderButton, undef, 0" when you mostly want default behaviors.
   
   The package provides a function called 'render', called as Apache::lonnavmaps::renderer->render({}).
   
   =head2 Overview of Columns
   
   The renderer will build an HTML table for the navmap and return it. The table is consists of several columns, and a row for each resource (or possibly each part). You tell the renderer how many columns to create and what to place in each column, optionally using one or more of the preparent columns, and the renderer will assemble the table.
   
   Any additional generally useful column types should be placed in the renderer code here, so anybody can use it anywhere else. Any code specific to the current application (such as the addition of <input> elements in a column) should be placed in the code of the thing using the renderer.
   
   At the core of the renderer is the array reference COLS (see Example section below for how to pass this correctly). The COLS array will consist of entries of one of two types of things: Either an integer representing one of the pre-packaged column types, or a sub reference that takes a resource reference, a part number, and a reference to the argument hash passed to the renderer, and returns a string that will be inserted into the HTML representation as it.
   
   The pre-packaged column names are refered to by constants in the Apache::lonnavmaps::renderer namespace. The following currently exist:
   
   =over 4
   
   =item * B<resource>: The general info about the resource: Link, icon for the type, etc. The first column in the standard nav map display. This column also accepts the following parameter in the renderer hash:
   
   =over 4
   
   =item * B<resource_nolink>: If true, the resource will not be linked. Default: false, resource will have links.
   
   =item * B<resource_part_count>: If true (default), the resource will show a part count if the full part list is not displayed. If false, the resource will never show a part count.
   
   =back
   
   =item B<communication_status>: Whether there is discussion on the resource, email for the user, or (lumped in here) perl errors in the execution of the problem. This is the second column in the main nav map.
   
   =item B<quick_status>: An icon for the status of a problem, with four possible states: Correct, incorrect, open, or none (not open yet, not a problem). The third column of the standard navmap.
   
   =item B<long_status>: A text readout of the details of the current status of the problem, such as "Due in 22 hours". The fourth column of the standard navmap.
   
   =back
   
   If you add any others please be sure to document them here.
   
   An example of a column renderer that will show the ID number of a resource, along with the part name if any:
   
    sub { 
     my ($resource, $part, $params) = @_;   
     if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
     return '<td>' . $resource->{ID} . '</td>';
    }
   
   Note these functions are responsible for the TD tags, which allow them to override vertical and horizontal alignment, etc.
   
   =head2 Parameters
   
   =over 4
   
   =item * B<iterator>: A reference to a fresh ::iterator to use from the navmaps. The rendering will reflect the options passed to the iterator, so you can use that to just render a certain part of the course, if you like.
   
   =item * B<cols>: An array reference
   
   =item * B<showParts>: A flag. If yes (default), a line for the resource itself, and a line for each part will be displayed. If not, only one line for each resource will be displayed.
   
   =item * B<condenseParts>: A flag. If yes (default), if all parts of the problem have the same status and that status is Nothing Set, Correct, or Network Failure, then only one line will be displayed for that resource anyhow. If no, all parts will always be displayed. If showParts is 0, this is ignored.
   
   =item * B<jumpCount>: A string identifying the URL to place the anchor 'curloc' at. Default to no anchor at all. It is the responsibility of the renderer user to ensure that the #curloc is in the URL.
   
   =item * B<hereURL>: A URL identifying where to place the 'here' marker.
   
   =item * B<hereSymb>: A Symb identifying where to place the 'here' marker.
   
   =item * B<indentString>: A string identifying the indentation string to use. By default, this is a 25 pixel whitespace image with no alt text.
   
   =back
   
   =cut
   
   sub resource { return 0; }
   sub communication_status { return 1; }
   sub quick_status { return 2; }
   sub long_status { return 3; }
   
   sub setDefault {
       my ($val, $default) = @_;
       if (!defined($val)) { return $default; }
       return $val;
   }
   
   sub render {
       my $args = shift;
       
       # Configure the renderer.
       my $cols = $args->{'cols'};
       if (!defined($cols)) {
           # no columns, no nav maps.
           return '';
       }
       my $it = $args->{'iterator'};
       if (!defined($it)) {
           # no iterator, no nav map.
           return '';
       }
       
       my $showParts = setDefault($args->{'showParts'}, 1);
       my $condenseParts = setDefault($args->{'condenseParts'}, 1);
       my $jumpToURL = $args->{'jumpToURL'};
       my $jumpToSymb = $args->{'jumpToSymb'};
       my $indentString = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
   
       # End parameter setting
   
       # Data
       my $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
       my $res = "Apache::lonnavmaps::resource";
       my %condenseStatuses =
           ( $res->NETWORK_FAILURE    => 1,
             $res->NOTHING_SET        => 1,
             $res->CORRECT            => 1 );
       my @backgroundColors = ("#FFFFFF", "#F6F6F6");
   
       # Set up iteration.
       my $depth = 1;
       $it->next(); # discard initial BEGIN_MAP
       my $curRes = $it->next();
       my $indentLevel = 0;
       my $isNewBranch = 0;
       my $now = time();
       my $in24Hours = $now + 24 * 60 * 60;
       my $displayedHereMarker = 0;
       my $displayedJumpMarker = 0;
       my $rownum = 0;
   
       while ($depth > 0) {
           if ($curRes == $it->BEGIN_MAP()) { $depth++; }
           if ($curRes == $it->END_MAP()) { $depth--; }
   
           # Maintain indentation level.
           if ($curRes == $it->BEGIN_MAP() ||
               $curRes == $it->BEGIN_BRANCH() ) {
               indentLevel++;
           }
           if ($curRes == $it->END_MAP() ||
               $curRes == $it->END_BRANCH() ) {
               $indentLevel--;
           }
           # Notice new branches
           if ($curRes == $it->BEGIN_BRANCH()) {
               $isNewBranch = 1;
           }
           
           my $deltalevel = $isNewBranch? 1 : 0; # reserve space for branch symbol
           if ($indentLevel - $deltalevel < 0) {
               # If this would be at a negative depth (top-level maps in
               # new-style courses, we want to suppress their title display)
               # then ignore it.
               $curRes = $it->next();
               next;
           }
   
           # Does it have multiple parts?
           my $multipart = 0;
           my $condensed = 0;
           my @parts;
               
           # Decide what parts to show.
           if ($showParts) {
               @parts = @{$curRes->parts()};
               $multipart = scalar(@parts) > 1;
               
               if ($condenseParts) { # do the condensation
                   if (!$curRes->opendate("0")) {
                       @parts = ("0");
                       $condensed = 1;
                   }
                   if (!$condensed) {
                       # Decide whether to condense based on similarity
                       my $status = $curRes->status($parts[1]);
                       my $due = $curRes->duedate($parts[1]);
                       my $open = $curRes->opendate($parts[1]);
                       my $statusAllSame = 1;
                       my $dueAllSame = 1;
                       my $openAllSame = 1;
                       for (my $i = 2; $i < scalar(@parts); $i++) {
                           if ($curRes->status($parts[$i]) != $status){
                               $statusAllSame = 0;
                           }
                           if ($curRes->duedate($parts[$i]) != $due ) {
                               $dueAllSame = 0;
                           }
                           if ($curRes->opendate($parts[$i]) != $open) {
                               $openAllSame = 0;
                           }
                       }
                       # $*allSame is true if all the statuses were
                       # the same. Now, if they are all the same and
                       # match one of the statuses to condense, or they
                       # are all open with the same due date, or they are
                       # all OPEN_LATER with the same open date, display the
                       # status of the first non-zero part (to get the 'correct'
                       # status right, since 0 is never 'correct' or 'open').
                       if (($statusAllSame && defined($condenseStatuses{$status})) ||
                           ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                           ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
                           @parts = ($parts[1]);
                           $condensed = 1;
                       }
                       
                   }
               }
               
           } else {
               # Not showing parts
               @parts = ("0"); # show main part only
           }
   
           # If the multipart problem was condensed, "forget" it was multipart
           if (scalar(@parts) == 1) {
               $multipart = 0;
           }
   
           # In the event of a network error, display one part.
           # If this is a single part, we can at least show the correct
           # status, but if it's multipart, we're lost, since we can't
           # retreive the metadata to count the parts
           if ($curRes->{RESOURCE_ERROR}) {
               @parts = ("0");
           }
   
           # Now, we've decided what parts to show. Loop through them and
           # show them.
           foreach my $part (@parts) {
               $rownum ++;
               my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
               
               $result .= "  <tr bgcolor='$backgroundColor'>\n";
               
               # Now, display each column.
               foreach my $col (@$cols) {
                   $result .= "    <td>";
   
                   # Decide what to display
                   
   
                   $result .= "</td>\n";
               }
   
 # This package must precede "navmap" because "navmap" uses it. In              $result .= "  </tr>\n";
 # order to keep the documentation order straight, the iterator is documented          }
 # after the navmap object.          
   
           $curRes = $it->next();
       }
       
       $result .= "</table>";
   
       return $result;
   }
   
   sub render_resource {
       my ($resource, $part, $params) = @_;
       return "<td align='center'>resource</td>";
   }
   sub render_communication_status {
       my ($resource, $part, $params) = @_;
       return "<td align='center'>comm_status</td>";
   }
   sub render_quick_status {
       my ($resource, $part, $params) = @_;
       return "<td align='center'>quick_status</td>";
   }
   sub render_long_status {
       my ($resource, $part, $params) = @_;
       return "<td align='center'>long_status</td>";
   }
   
   my @preparedColumns = (\&render_resource, \&render_communication_status,
                          \&render_quick_status, \&render_long_status);
   
   1;
   
   package Apache::lonnavmaps::iterator;
   
 =pod  =pod
   
Line 1890  getIterator behaves as follows: Line 1655  getIterator behaves as follows:
   
 =over 4  =over 4
   
 =item B<getIterator>(firstResource, finishResource, filterHash, condition): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0, which is to say, do not recurse unless explicitly asked to.  =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0. forceTop is a boolean value. If it is false (default), the iterator will only return the first level of map that is not just a single, 'redirecting' map. If true, the iterator will return all information, starting with the top-level map, regardless of content.
   
 Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples: By default, the condition is 0 and all folders are closed unless explicitly opened. Clicking "Show All Resources" will use a condition of 1 and an empty filterHash, resulting in all resources being shown.  Thus, by default, only top-level resources will be shown. Change the condition to a 1 without changing the hash, and all resources will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively suppress parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively add parts of the nav map. See the handler code for examples.
   
 The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:  The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:
   
Line 1910  The iterator will return either a refere Line 1675  The iterator will return either a refere
   
 The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.  The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
   
   Maps can contain empty resources. The iterator will automatically skip over such resources, but will still treat the structure correctly. Thus, a complicated map with several branches, but consisting entirely of empty resources except for one beginning or ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs, but only one resource will be returned.
   
 =back  =back
   
 =cut  =cut
Line 1920  sub BEGIN_MAP { return 1; }    # beginin Line 1687  sub BEGIN_MAP { return 1; }    # beginin
 sub END_MAP { return 2; }      # end of the map  sub END_MAP { return 2; }      # end of the map
 sub BEGIN_BRANCH { return 3; } # beginning of a branch  sub BEGIN_BRANCH { return 3; } # beginning of a branch
 sub END_BRANCH { return 4; }   # end of a branch  sub END_BRANCH { return 4; }   # end of a branch
   sub FORWARD { return 1; }      # go forward
   sub BACKWARD { return 2; }
   
 # Params: nav map, start resource, end resource, filter, condition,   sub min {
 # already seen hash ref      (my $a, my $b) = @_;
       if ($a < $b) { return $a; } else { return $b; }
   }
   
   # In the CVS repository, documentation of this algorithm is included 
   # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
   # will reference the same location in the text as the part of the
   # algorithm is running through.
   
 sub new {  sub new {
     # magic invocation to create a class instance      # magic invocation to create a class instance
Line 1951  sub new { Line 1727  sub new {
     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
     $self->{CONDITION} = shift;      $self->{CONDITION} = shift;
   
     # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.      # Do we want to automatically follow "redirection" maps?
       $self->{FORCE_TOP} = shift;
   
       # Now, we need to pre-process the map, by walking forward and backward
       # over the parts of the map we're going to look at.
   
       # The processing steps are exactly the same, except for a few small 
       # changes, so I bundle those up in the following list of two elements:
       # (direction_to_iterate, VAL_name, next_resource_method_to_call,
       # first_resource).
       # This prevents writing nearly-identical code twice.
       my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                           'FIRST_RESOURCE'],
                          [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                           'FINISH_RESOURCE'] );
   
       my $maxDepth = 0; # tracks max depth
   
       # If there is only one resource in this map, and it's a map, we
       # want to remember that, so the user can ask for the first map
       # that isn't just a redirector.
       my $resource; my $resourceCount = 0;
   
       # **1**
   
       foreach my $pass (@iterations) {
           my $direction = $pass->[0];
           my $valName = $pass->[1];
           my $nextResourceMethod = $pass->[2];
           my $firstResourceName = $pass->[3];
   
           my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                                                               $self->{FIRST_RESOURCE},
                                                               $self->{FINISH_RESOURCE},
                                                               {}, undef, 0, $direction);
       
           # prime the recursion
           $self->{$firstResourceName}->{DATA}->{$valName} = 0;
           my $depth = 0;
           $iterator->next();
           my $curRes = $iterator->next();
           while ($depth > -1) {
               if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
               if ($curRes == $iterator->END_MAP()) { $depth--; }
           
               if (ref($curRes)) {
                   # If there's only one resource, this will save it
                   # we have to filter empty resources from consideration here,
                   # or even "empty", redirecting maps have two (start & finish)
                   # or three (start, finish, plus redirector)
                   if($direction == FORWARD && $curRes->src()) { 
                       $resource = $curRes; $resourceCount++; 
                   }
                   my $resultingVal = $curRes->{DATA}->{$valName};
                   my $nextResources = $curRes->$nextResourceMethod();
                   my $nextCount = scalar(@{$nextResources});
   
                   if ($nextCount == 1) { # **3**
                       my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                       $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   }
                   
                   if ($nextCount > 1) { # **4**
                       foreach my $res (@{$nextResources}) {
                           my $current = $res->{DATA}->{$valName} || 999999999;
                           $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                       }
                   }
               }
               
               # Assign the final val (**2**)
               if (ref($curRes) && $direction == BACKWARD()) {
                   my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
                                        $curRes->{DATA}->{BOT_UP_VAL});
                   
                   $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                   if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
                   }
               $curRes = $iterator->next();
           }
       }
   
       # Check: Was this only one resource, a map?
       if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) { 
           my $firstResource = $resource->map_start();
           my $finishResource = $resource->map_finish();
           return 
               Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                                                 $finishResource, $self->{FILTER},
                                                 $self->{ALREADY_SEEN}, 
                                                 $self->{CONDITION}, 0);
           
       }
   
       # Set up some bookkeeping information.
       $self->{CURRENT_DEPTH} = 0;
       $self->{MAX_DEPTH} = $maxDepth;
       $self->{STACK} = [];
       $self->{RECURSIVE_ITERATOR_FLAG} = 0;
   
       for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
           push @{$self->{STACK}}, [];
       }
   
       # Prime the recursion w/ the first resource **5**
       push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
       $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
   
       bless ($self);
   
       return $self;
   }
   
   sub next {
       my $self = shift;
   
       if ($self->{RECURSIVE_ITERATOR_FLAG}) {
           # grab the next from the recursive iterator 
           my $next = $self->{RECURSIVE_ITERATOR}->next();
   
           # is it a begin or end map? If so, update the depth
           if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
           if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
   
           # Are we back at depth 0? If so, stop recursing
           if ($self->{RECURSIVE_DEPTH} == 0) {
               $self->{RECURSIVE_ITERATOR_FLAG} = 0;
           }
   
           return $next;
       }
   
       if (defined($self->{FORCE_NEXT})) {
           my $tmp = $self->{FORCE_NEXT};
           $self->{FORCE_NEXT} = undef;
           return $tmp;
       }
   
       # Have we not yet begun? If not, return BEGIN_MAP and
       # remember we've started.
       if ( !$self->{STARTED} ) { 
           $self->{STARTED} = 1;
           return $self->BEGIN_MAP();
       }
   
       # Here's the guts of the iterator.
       
       # Find the next resource, if any.
       my $found = 0;
       my $i = $self->{MAX_DEPTH};
       my $newDepth;
       my $here;
       while ( $i >= 0 && !$found ) {
           if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
               $here = pop @{$self->{STACK}->[$i]}; # **7**
               $found = 1;
               $newDepth = $i;
           }
           $i--;
       }
   
       # If we still didn't find anything, we're done.
       if ( !$found ) {
           # We need to get back down to the correct branch depth
           if ( $self->{CURRENT_DEPTH} > 0 ) {
               $self->{CURRENT_DEPTH}--;
               return END_BRANCH();
           } else {
               return END_MAP();
           }
       }
   
       # If this is not a resource, it must be an END_BRANCH marker we want
       # to return directly.
       if (!ref($here)) { # **8**
           if ($here == END_BRANCH()) { # paranoia, in case of later extension
               $self->{CURRENT_DEPTH}--;
               return $here;
           }
       }
   
       # Otherwise, it is a resource and it's safe to store in $self->{HERE}
       $self->{HERE} = $here;
   
       # Get to the right level
       if ( $self->{CURRENT_DEPTH} > $newDepth ) {
           push @{$self->{STACK}->[$newDepth]}, $here;
           $self->{CURRENT_DEPTH}--;
           return END_BRANCH();
       }
       if ( $self->{CURRENT_DEPTH} < $newDepth) {
           push @{$self->{STACK}->[$newDepth]}, $here;
           $self->{CURRENT_DEPTH}++;
           return BEGIN_BRANCH();
       }
   
       # If we made it here, we have the next resource, and we're at the
       # right branch level. So let's examine the resource for where
       # we can get to from here.
   
       # So we need to look at all the resources we can get to from here,
       # categorize them if we haven't seen them, remember if we have a new
       my $nextUnfiltered = $here->getNext();
       my $maxDepthAdded = -1;
       
       for (@$nextUnfiltered) {
           if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
               my $depth = $_->{DATA}->{DISPLAY_DEPTH};
               push @{$self->{STACK}->[$depth]}, $_;
               $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
               if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
           }
       }
   
       # Is this the end of a branch? If so, all of the resources examined above
       # led to lower levels then the one we are currently at, so we push a END_BRANCH
       # marker onto the stack so we don't forget.
       # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
       # BC branch and gets to C, it will see F as the only next resource, but it's
       # one level lower. Thus, this is the end of the branch, since there are no
       # more resources added to this level or above.
       # We don't do this if the examined resource is the finish resource,
       # because the condition given above is true, but the "END_MAP" will
       # take care of things and we should already be at depth 0.
       my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
       if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
           push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
       }
   
       # That ends the main iterator logic. Now, do we want to recurse
       # down this map (if this resource is a map)?
       if ($self->{HERE}->is_map() &&
           (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
           $self->{RECURSIVE_ITERATOR_FLAG} = 1;
           my $firstResource = $self->{HERE}->map_start();
           my $finishResource = $self->{HERE}->map_finish();
   
           $self->{RECURSIVE_ITERATOR} = 
               Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                                                 $finishResource, $self->{FILTER},
                                                 $self->{ALREADY_SEEN}, $self->{CONDITION});
       }
   
       # If this is a blank resource, don't actually return it.
       # Should you ever find you need it, make sure to add an option to the code
       #  that you can use; other things depend on this behavior.
       if (!$self->{HERE}->src() || !$self->{HERE}->browsePriv()) {
           return $self->next();
       }
   
       return $self->{HERE};
   
   }
   
   =pod
   
   The other method available on the iterator is B<getStack>, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map).
   
   =cut
   
   sub getStack {
       my $self=shift;
   
       my @stack;
   
       $self->populateStack(\@stack);
   
       return \@stack;
   }
   
   # Private method: Calls the iterators recursively to populate the stack.
   sub populateStack {
       my $self=shift;
       my $stack = shift;
   
       push @$stack, $self->{HERE} if ($self->{HERE});
   
       if ($self->{RECURSIVE_ITERATOR_FLAG}) {
           $self->{RECURSIVE_ITERATOR}->populateStack($stack);
       }
   }
   
   1;
   
   package Apache::lonnavmaps::DFSiterator;
   
   # Not documented in the perldoc: This is a simple iterator that just walks
   #  through the nav map and presents the resources in a depth-first search
   #  fashion, ignorant of conditionals, randomized resources, etc. It presents
   #  BEGIN_MAP and END_MAP, but does not understand branches at all. It is
   #  useful for pre-processing of some kind, and is in fact used by the main
   #  iterator that way, but that's about it.
   # One could imagine merging this into the init routine of the main iterator,
   #  but this might as well be left seperate, since it is possible some other
   #  use might be found for it. - Jeremy
   
   # Unlike the main iterator, this DOES return all resources, even blank ones.
   #  The main iterator needs them to correctly preprocess the map.
   
   sub BEGIN_MAP { return 1; }    # begining of a new map
   sub END_MAP { return 2; }      # end of the map
   sub FORWARD { return 1; }      # go forward
   sub BACKWARD { return 2; }
   
   # Params: Nav map ref, first resource id/ref, finish resource id/ref,
   #         filter hash ref (or undef), already seen hash or undef, condition
   #         (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
   sub new {
       # magic invocation to create a class instance
       my $proto = shift;
       my $class = ref($proto) || $proto;
       my $self = {};
   
       $self->{NAV_MAP} = shift;
       return undef unless ($self->{NAV_MAP});
   
       $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
       $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
   
       # If the given resources are just the ID of the resource, get the
       # objects
       if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
       if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
   
       $self->{FILTER} = shift;
   
       # A hash, used as a set, of resource already seen
       $self->{ALREADY_SEEN} = shift;
       if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
       $self->{CONDITION} = shift;
       $self->{DIRECTION} = shift || FORWARD();
   
       # Flag: Have we started yet?
     $self->{STARTED} = 0;      $self->{STARTED} = 0;
   
     # Should we continue calling the recursive iterator, if any?      # Should we continue calling the recursive iterator, if any?
Line 1965  sub new { Line 2075  sub new {
     $self->{RECURSIVE_DEPTH} = 0;      $self->{RECURSIVE_DEPTH} = 0;
   
     # For keeping track of our branches, we maintain our own stack      # For keeping track of our branches, we maintain our own stack
     $self->{BRANCH_STACK} = [];      $self->{STACK} = [];
     # If the size shrinks, we exhausted a branch  
     $self->{BRANCH_STACK_SIZE} = 0;  
     $self->{BRANCH_DEPTH} = 0;  
   
     # For returning two things in a forced sequence  
     $self->{FORCE_NEXT} = undef;  
   
     # Start with the first resource      # Start with the first resource
     push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};      if ($self->{DIRECTION} == FORWARD) {
     $self->{BRANCH_STACK_SIZE} = 1;          push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
       } else {
           push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
       }
   
     bless($self);      bless($self);
     return $self;      return $self;
 }  }
   
 # Note... this function is *touchy*. I strongly recommend tracing  
 # through it with the debugger a few times on a non-trivial map before  
 # modifying it. Order is *everything*.  
 sub next {  sub next {
     my $self = shift;      my $self = shift;
           
     # Iterator logic goes here  
   
     # Are we using a recursive iterator? If so, pull from that and      # Are we using a recursive iterator? If so, pull from that and
     # watch the depth; we want to resume our level at the correct time.      # watch the depth; we want to resume our level at the correct time.
     if ($self->{RECURSIVE_ITERATOR_FLAG})      if ($self->{RECURSIVE_ITERATOR_FLAG}) {
     {  
         # grab the next from the recursive iterator          # grab the next from the recursive iterator
         my $next = $self->{RECURSIVE_ITERATOR}->next();          my $next = $self->{RECURSIVE_ITERATOR}->next();
                   
Line 2008  sub next { Line 2109  sub next {
         return $next;          return $next;
     }      }
   
     # Is this return value pre-determined?  
     if (defined($self->{FORCE_NEXT})) {  
         my $tmp = $self->{FORCE_NEXT};  
         $self->{FORCE_NEXT} = undef;  
         return $tmp;  
     }  
   
     # Is there a current resource to grab? If not, then return      # Is there a current resource to grab? If not, then return
     # END_BRANCH and END_MAP in succession.      # END_MAP, which will end the iterator.
     if (scalar(@{$self->{BRANCH_STACK}}) == 0) {      if (scalar(@{$self->{STACK}}) == 0) {
         if ($self->{BRANCH_DEPTH} > 0) {          return $self->END_MAP();
             $self->{FORCE_NEXT} = $self->END_MAP();  
             $self->{BRANCH_DEPTH}--;  
             return $self->END_BRANCH();  
         } else {  
             return $self->END_MAP();  
         }  
     }      }
   
     # Have we not yet begun? If not, return BEGIN_MAP and       # Have we not yet begun? If not, return BEGIN_MAP and 
Line 2034  sub next { Line 2122  sub next {
         return $self->BEGIN_MAP;          return $self->BEGIN_MAP;
     }      }
   
     # Did the branch stack shrink since last run? If so,  
     # we exhausted a branch last time, therefore, we're about  
     # to start a new one. (We know because we already checked to see  
     # if the stack was empty.)  
     if ( scalar (@{$self->{BRANCH_STACK}}) < $self->{BRANCH_STACK_SIZE}) {  
         $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});  
         $self->{BRANCH_DEPTH}++;  
         return $self->BEGIN_BRANCH();  
     }  
   
     # Remember the size for comparision next time.  
     $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});  
   
     # If the next resource we mean to return is going to need  
     # a lower branch level, terminate branches until we get   
     # there.  
   
     # Get the next resource in the branch      # Get the next resource in the branch
     $self->{HERE} = pop @{$self->{BRANCH_STACK}};      $self->{HERE} = pop @{$self->{STACK}};
   
     # Are we at the right depth? If not, close a branch and return      # remember that we've seen this, so we don't return it again later
     # the current resource onto the branch stack  
     if (defined($self->{HERE}->{DATA}->{ITERATOR_DEPTH})  
         && $self->{HERE}->{DATA}->{ITERATOR_DEPTH} <  
         $self->{BRANCH_DEPTH} ) {  
         $self->{BRANCH_DEPTH}--;  
         # return it so we can pick it up eventually  
         push @{$self->{BRANCH_STACK}}, $self->{HERE};  
         return $self->END_BRANCH();  
     }  
   
     # We always return it after this point and never before  
     # (proof: look at just the return statements), so we  
     # remember that we've seen this.  
     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;      $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
           
     # Get the next possible resources      # Get the next possible resources
     my $nextUnfiltered = $self->{HERE}->getNext();      my $nextUnfiltered;
       if ($self->{DIRECTION} == FORWARD()) {
           $nextUnfiltered = $self->{HERE}->getNext();
       } else {
           $nextUnfiltered = $self->{HERE}->getPrevious();
       }
     my $next = [];      my $next = [];
   
     # filter the next possibilities to remove things we've       # filter the next possibilities to remove things we've 
     # already seen. Also, remember what branch depth they should      # already seen.
     # be displayed at, since there's no other reliable way to tell.  
     foreach (@$nextUnfiltered) {      foreach (@$nextUnfiltered) {
         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {          if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
             push @$next, $_;              push @$next, $_;
             $_->{DATA}->{ITERATOR_DEPTH} =   
                 $self->{BRANCH_DEPTH} + 1;  
         }          }
     }      }
   
     # Handle branch cases:  
     # Nothing is available next: BRANCH_END  
     # 1 thing next: standard non-branch  
     # 2+ things next: have some branches  
     my $nextCount = scalar(@$next);  
     if ($nextCount == 0) {  
         # Return this and on the next run, close the branch up if we're   
         # in a branch  
         if ($self->{BRANCH_DEPTH} > 0 ) {  
             $self->{FORCE_NEXT} = $self->END_BRANCH();  
             $self->{BRANCH_DEPTH}--;  
         }  
     }  
       
     while (@$next) {      while (@$next) {
         # copy the next possibilities over to the branch stack          # copy the next possibilities over to the stack
         # in the right order          push @{$self->{STACK}}, shift @$next;
         push @{$self->{BRANCH_STACK}}, shift @$next;  
     }  
   
     if ($nextCount >= 2) {  
         $self->{FORCE_NEXT} = $self->BEGIN_BRANCH();  
         $self->{BRANCH_DEPTH}++;  
         return $self->{HERE};   
     }      }
   
     # If this is a map and we want to recurse down it... (not filtered out)      # If this is a map and we want to recurse down it... (not filtered out)
Line 2119  sub next { Line 2158  sub next {
         my $finishResource = $self->{HERE}->map_finish();          my $finishResource = $self->{HERE}->map_finish();
   
         $self->{RECURSIVE_ITERATOR} =          $self->{RECURSIVE_ITERATOR} =
           Apache::lonnavmaps::iterator->new ($self->{NAV_MAP}, $firstResource,             Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},                       $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
                                              $self->{CONDITION});                                               $self->{CONDITION}, $self->{DIRECTION});
     }      }
   
     return $self->{HERE};      return $self->{HERE};
 }  }
   
 =pod  
   
 The other method available on the iterator is B<getStack>, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map).  
   
 =cut  
   
 sub getStack {  
     my $self=shift;  
   
     my @stack;  
   
     $self->populateStack(\@stack);  
   
     return \@stack;  
 }  
   
 # Private method: Calls the iterators recursively to populate the stack.  
 sub populateStack {  
     my $self=shift;  
     my $stack = shift;  
   
     push @$stack, $self->{HERE};  
   
     if ($self->{RECURSIVE_ITERATOR_FLAG}) {  
         $self->{RECURSIVE_ITERATOR}->populateStack($stack);  
     }  
 }  
   
 1;  1;
   
 package Apache::lonnavmaps::resource;  package Apache::lonnavmaps::resource;
Line 2215  sub navHash { Line 2226  sub navHash {
     my $self = shift;      my $self = shift;
     my $param = shift;      my $param = shift;
     my $id = shift;      my $id = shift;
     return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")};      return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
 }  }
   
 =pod  =pod
   
 B<Metadata Retreival>  B<Metadata Retreival>
   
 These are methods that help you retrieve metadata about the resource:  These are methods that help you retrieve metadata about the resource: Method names are based on the fields in the compiled course representation.
   
 =over 4  =over 4
   
   =item * B<compTitle>: Returns a "composite title", that is equal to $res->title() if the resource has a title, and is otherwise the last part of the URL (e.g., "problem.problem").
   
 =item * B<ext>: Returns true if the resource is external.  =item * B<ext>: Returns true if the resource is external.
   
 =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)  =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
   
 =item * B<kind>: Returns the kind of the resource from the compiled nav map.  =item * B<kind>: Returns the kind of the resource from the compiled nav map.
   
 =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature.  =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. In other words, this is usually false.
   
 =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)  =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
   
Line 2244  These are methods that help you retrieve Line 2257  These are methods that help you retrieve
   
 =item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)  =item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
   
 =item * B<type>: Returns the type of the resource, "start", "normal", or "finish".   
   
 =back  =back
   
 =cut  =cut
   
 # These info functions can be used directly, as they don't return  # These info functions can be used directly, as they don't return
 # resource information.  # resource information.
   sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
 sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }  sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
   sub from { my $self=shift; return $self->navHash("from_", 1); }
 sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }  sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
 sub kind { my $self=shift; return $self->navHash("kind_", 1); }  sub kind { my $self=shift; return $self->navHash("kind_", 1); }
 sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }  sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
Line 2275  sub symb { Line 2288  sub symb {
 }  }
 sub title { my $self=shift; return $self->navHash("title_", 1); }  sub title { my $self=shift; return $self->navHash("title_", 1); }
 sub to { my $self=shift; return $self->navHash("to_", 1); }  sub to { my $self=shift; return $self->navHash("to_", 1); }
 sub type { my $self=shift; return $self->navHash("type_", 1); }  sub compTitle {
       my $self = shift;
       my $title = $self->title();
       if (!$title) {
           $title = $self->src();
           $title = substr($title, rindex($title, '/') + 1);
       }
       return $title;
   }
 =pod  =pod
   
 B<Predicate Testing the Resource>  B<Predicate Testing the Resource>
Line 2293  These methods are shortcuts to deciding Line 2313  These methods are shortcuts to deciding
   
 =item * B<is_problem>: Returns true if the resource is a problem.  =item * B<is_problem>: Returns true if the resource is a problem.
   
 =item * B<is_sequence>: Returns true if the resource sequence.  =item * B<is_sequence>: Returns true if the resource is a sequence.
   
 =back  =back
   
Line 2322  sub is_sequence { Line 2342  sub is_sequence {
     return ($src =~ /sequence$/);      return ($src =~ /sequence$/);
 }  }
   
   # Private method: Shells out to the parmval in the nav map, handler parts.
   
   
   
 # Move this into POD: In order to use these correctly, courseopt  
 # and useropt need to be generated  
 sub parmval {  sub parmval {
     my $self = shift;      my $self = shift;
     my $what = shift;      my $what = shift;
Line 2441  sub answerdate { Line 2456  sub answerdate {
     }      }
     return $self->parmval("answerdate", $part);      return $self->parmval("answerdate", $part);
 }  }
   sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
 sub duedate {  sub duedate {
     (my $self, my $part) = @_;      (my $self, my $part) = @_;
     return $self->parmval("duedate", $part);      return $self->parmval("duedate", $part);
Line 2465  sub tol { Line 2481  sub tol {
     (my $self, my $part) = @_;      (my $self, my $part) = @_;
     return $self->parmval("tol", $part);      return $self->parmval("tol", $part);
 }  }
 sub tries {  sub tries { 
     my $self = shift;      my $self = shift; 
     my $part = shift;      my $tries = $self->queryRestoreHash('tries', shift);
     $part = '0' if (!defined($part));      if (!defined($tries)) { return '0';}
   
     # Make sure return hash is loaded, should error check  
     $self->getReturnHash();  
       
     my $tries = $self->{RETURN_HASH}->{'resource.'.$part.'.tries'};  
     if (!defined($tries)) {return '0';}  
     return $tries;      return $tries;
 }  }
 sub type {  sub type {
     (my $self, my $part) = @_;      (my $self, my $part) = @_;
     return $self->parmval("type", $part);      return $self->parmval("type", $part);
 }  }
 sub weight {  sub weight { 
     (my $self, my $part) = @_;      my $self = shift; my $part = shift;
     return $self->parmval("weight", $part);      return $self->parmval("weight", $part);
 }  }
   
Line 2491  sub getReturnHash { Line 2501  sub getReturnHash {
     my $self = shift;      my $self = shift;
           
     if (!defined($self->{RETURN_HASH})) {      if (!defined($self->{RETURN_HASH})) {
         my %tmpHash = &Apache::lonnet::restore($self->symb());          my %tmpHash  = &Apache::lonnet::restore($self->symb());
         $self->{RETURN_HASH} = \%tmpHash;          $self->{RETURN_HASH} = \%tmpHash;
     }      }
 }         }       
Line 2537  sub hasDiscussion { Line 2547  sub hasDiscussion {
   
 sub getFeedback {  sub getFeedback {
     my $self = shift;      my $self = shift;
     return $self->{NAV_MAP}->getFeedback($self->symb());      my $source = $self->src();
       if ($source =~ /^\/res\//) { $source = substr $source, 5; }
       return $self->{NAV_MAP}->getFeedback($source);
   }
   
   sub getErrors {
       my $self = shift;
       my $source = $self->src();
       if ($source =~ /^\/res\//) { $source = substr $source, 5; }
       return $self->{NAV_MAP}->getErrors($source);
 }  }
   
 =pod  =pod
Line 2610  sub extractParts { Line 2629  sub extractParts {
   
 =head2 Resource Status  =head2 Resource Status
   
 Problem resources have status information, reflecting their various dates and completion statuses. You can obtain this information and import symbolic constants to represent the status.  Problem resources have status information, reflecting their various dates and completion statuses. 
   
 There are two aspects to the status: the date-related information and the completion information.  There are two aspects to the status: the date-related information and the completion information.
   
Line 2627  Idiomatic usage of these two methods wou Line 2646  Idiomatic usage of these two methods wou
     ... use it here ...      ... use it here ...
  }   }
   
   Which you use depends on exactly what you are looking for. The status() function has been optimized for the nav maps display and may not precisely match what you need elsewhere.
   
   The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
   
 =over 4  =over 4
   
 =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:  =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:
Line 2740  sub ATTEMPTED             { return 16; } Line 2763  sub ATTEMPTED             { return 16; }
   
 sub getCompletionStatus {  sub getCompletionStatus {
     my $self = shift;      my $self = shift;
     my $part = shift;  
     $part = "0" if (!defined($part));  
     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});      return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
   
     # Make sure return hash exists      my $status = $self->queryRestoreHash('solved', shift);
     $self->getReturnHash();  
       
     my $status = $self->{RETURN_HASH}->{'resource.'.$part.'.solved'};  
   
     # Left as seperate if statements in case we ever do more with this      # Left as seperate if statements in case we ever do more with this
     if ($status eq 'correct_by_student') {return $self->CORRECT;}      if ($status eq 'correct_by_student') {return $self->CORRECT;}
Line 2759  sub getCompletionStatus { Line 2777  sub getCompletionStatus {
     return $self->NOT_ATTEMPTED;      return $self->NOT_ATTEMPTED;
 }  }
   
   sub queryRestoreHash {
       my $self = shift;
       my $hashentry = shift;
       my $part = shift;
       $part = "0" if (!defined($part));
       return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
   
       $self->getReturnHash();
   
       return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
   }
   
 =pod  =pod
   
 B<Composite Status>  B<Composite Status>
   
 Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE()):  Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
   
 =over 4  =over 4
   
Line 2867  sub status { Line 2897  sub status {
   
 =over 4  =over 4
   
 =item * B<getNext>(): Gets the next resource in the navmap after this one.  =item * B<getNext>(): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case. 
   
 =cut  =item * B<getPrevious>(): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case. 
   
 # For the simple single-link case, to get from a resource to the next  =cut
 # resource, you need to look up the "to_" link in the nav hash, then  
 # follow that with the "goesto_" link.  
   
 sub getNext {  sub getNext {
     my $self = shift;      my $self = shift;
     my $alreadySeenHash = shift;  
     my @branches;      my @branches;
     my $to = $self->to();      my $to = $self->to();
     foreach my $branch ( split(/\,/, $to) ) {      foreach my $branch ( split(/,/, $to) ) {
         my $choice = $self->{NAV_MAP}->getById($branch);          my $choice = $self->{NAV_MAP}->getById($branch);
         my $next = $choice->goesto();          my $next = $choice->goesto();
         $next = $self->{NAV_MAP}->getById($next);          $next = $self->{NAV_MAP}->getById($next);
   
         # Don't remember it if we've already seen it or if          push @branches, $next;
         # the student doesn't have browse priviledges  
         my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);  
         if (!defined($alreadySeenHash) ||  
             !defined($alreadySeenHash->{$next->{ID}}) ||  
             ($browsePriv ne '2' && $browsePriv ne 'F')) {  
                 push @branches, $next;  
             }  
     }      }
     return \@branches;      return \@branches;
 }  }
   
   sub getPrevious {
       my $self = shift;
       my @branches;
       my $from = $self->from();
       foreach my $branch ( split /,/, $from) {
           my $choice = $self->{NAV_MAP}->getById($branch);
           my $prev = $choice->comesfrom();
           $prev = $self->{NAV_MAP}->getById($prev);
   
           push @branches, $prev;
       }
       return \@branches;
   }
   
   sub browsePriv {
       my $self = shift;
       if (defined($self->{BROWSE_PRIV})) {
           return $self->{BROWSE_PRIV};
       }
   
       $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
   }
   
 =pod  =pod
   
 =back  =back
Removed from v.1.82  
changed lines
  Added in v.1.132

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