Annotation of loncom/interface/lonnavmaps.pm, revision 1.56

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.56    ! bowersj2    4: # $Id: lonnavmaps.pm,v 1.55 2002/09/26 16:56:21 bowersj2 Exp $
1.20      albertel    5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
1.2       www        28: # (Page Handler
1.1       www        29: #
1.2       www        30: # (TeX Content Handler
1.1       www        31: #
1.2       www        32: # 05/29/00,05/30 Gerd Kortemeyer)
                     33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
                     34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1       www        35: #
1.17      www        36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21      www        37: # YEAR=2002
                     38: # 1/1 Gerd Kortemeyer
                     39: #
1.2       www        40: 
1.1       www        41: package Apache::lonnavmaps;
                     42: 
                     43: use strict;
1.2       www        44: use Apache::Constants qw(:common :http);
                     45: use Apache::lonnet();
1.18      albertel   46: use Apache::loncommon();
1.2       www        47: use HTML::TokeParser;
                     48: use GDBM_File;
                     49: 
                     50: # -------------------------------------------------------------- Module Globals
                     51: my %hash;
                     52: my @rows;
                     53: 
1.10      www        54: #
                     55: # These cache hashes need to be independent of user, resource and course
                     56: # (user and course can/should be in the keys)
                     57: #
                     58: 
                     59: my %courserdatas;
                     60: my %userrdatas;
                     61: 
                     62: #
                     63: # These global hashes are dependent on user, course and resource, 
                     64: # and need to be initialized every time when a sheet is calculated
                     65: #
                     66: my %courseopt;
                     67: my %useropt;
                     68: my %parmhash;
                     69: 
1.47      bowersj2   70: # This parameter keeps track of whether obtaining the user's information
                     71: # failed, which the colorizer in astatus can use
                     72: my $networkFailedFlag = 0;
                     73: 
1.2       www        74: # ------------------------------------------------------------------ Euclid gcd
                     75: 
                     76: sub euclid {
                     77:     my ($e,$f)=@_;
                     78:     my $a; my $b; my $r;
                     79:     if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
                     80:     while ($r!=0) {
1.51      bowersj2   81:         $a=$b; $b=$r;
1.2       www        82:         $r=$a%$b;
                     83:     }
                     84:     return $b;
                     85: }
                     86: 
1.10      www        87: # --------------------------------------------------------------------- Parmval
                     88: 
                     89: # -------------------------------------------- Figure out a cascading parameter
                     90: #
                     91: # For this function to work
                     92: #
                     93: # * parmhash needs to be tied
                     94: # * courseopt and useropt need to be initialized for this user and course
                     95: #
                     96: 
                     97: sub parmval {
                     98:     my ($what,$symb)=@_;
                     99:     my $cid=$ENV{'request.course.id'};
                    100:     my $csec=$ENV{'request.course.sec'};
                    101:     my $uname=$ENV{'user.name'};
                    102:     my $udom=$ENV{'user.domain'};
                    103: 
                    104:     unless ($symb) { return ''; }
                    105:     my $result='';
                    106: 
                    107:     my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
                    108: 
                    109: # ----------------------------------------------------- Cascading lookup scheme
1.24      albertel  110:     my $rwhat=$what;
                    111:     $what=~s/^parameter\_//;
                    112:     $what=~s/\_/\./;
                    113: 
                    114:     my $symbparm=$symb.'.'.$what;
                    115:     my $mapparm=$mapname.'___(all).'.$what;
                    116:     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
                    117: 
                    118:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                    119:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                    120:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                    121: 
                    122:     my $courselevel= $usercourseprefix.'.'.$what;
                    123:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                    124:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                    125: 
                    126: # ---------------------------------------------------------- first, check user
                    127:     if ($uname) {
1.51      bowersj2  128:         if ($useropt{$courselevelr}) { return $useropt{$courselevelr}; }
                    129:         if ($useropt{$courselevelm}) { return $useropt{$courselevelm}; }
                    130:         if ($useropt{$courselevel}) { return $useropt{$courselevel}; }
1.24      albertel  131:     }
1.10      www       132: 
1.24      albertel  133: # ------------------------------------------------------- second, check course
                    134:     if ($csec) {
1.51      bowersj2  135:         if ($courseopt{$seclevelr}) { return $courseopt{$seclevelr}; }
1.25      albertel  136:         if ($courseopt{$seclevelm}) { return $courseopt{$seclevelm}; }
1.10      www       137:         if ($courseopt{$seclevel}) { return $courseopt{$seclevel}; }
1.24      albertel  138:     }
1.10      www       139: 
1.24      albertel  140:     if ($courseopt{$courselevelr}) { return $courseopt{$courselevelr}; }
                    141:     if ($courseopt{$courselevelm}) { return $courseopt{$courselevelm}; }
                    142:     if ($courseopt{$courselevel}) { return $courseopt{$courselevel}; }
1.10      www       143: 
1.24      albertel  144: # ----------------------------------------------------- third, check map parms
1.10      www       145: 
1.24      albertel  146:     my $thisparm=$parmhash{$symbparm};
                    147:     if ($thisparm) { return $thisparm; }
1.10      www       148: 
1.24      albertel  149: # ----------------------------------------------------- fourth , check default
1.10      www       150: 
1.25      albertel  151:     my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
                    152:     if ($default) { return $default}
                    153: 
                    154: # --------------------------------------------------- fifth , cascade up parts
                    155: 
                    156:     my ($space,@qualifier)=split(/\./,$rwhat);
                    157:     my $qualifier=join('.',@qualifier);
                    158:     unless ($space eq '0') {
1.51      bowersj2  159:         my ($part,$id)=split(/\_/,$space);
                    160:         if ($id) {
                    161:             my $partgeneral=&parmval($part.".$qualifier",$symb);
                    162:             if ($partgeneral) { return $partgeneral; }
                    163:         } else {
                    164:             my $resourcegeneral=&parmval("0.$qualifier",$symb);
                    165:             if ($resourcegeneral) { return $resourcegeneral; }
                    166:         }
1.25      albertel  167:     }
                    168:     return '';
1.10      www       169: }
                    170: 
                    171: 
                    172: 
1.9       www       173: # ------------------------------------------------------------- Find out status
1.25      albertel  174: # return codes
                    175: # tcode (timecode)
                    176: # 1: will open later
                    177: # 2: is open and not past due yet
                    178: # 3: is past due date
                    179: # 4: due in the next 24 hours
                    180: #
                    181: # code (curent solved status)
                    182: # 1: not attempted
                    183: # 2: attempted but wrong, or incorrect by instructor
                    184: # 3: solved or correct by instructor
1.29      albertel  185: # 4: partially correct (one or more parts correct)
                    186: # "excused" needs to be supported, but is not yet.
1.9       www       187: sub astatus {
                    188:     my $rid=shift;
1.29      albertel  189:     my $code=0;
1.9       www       190:     my $ctext='';
                    191:     $rid=~/(\d+)\.(\d+)/;
1.10      www       192:     my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
1.51      bowersj2  193:         &Apache::lonnet::declutter($hash{'src_'.$rid});
1.15      www       194:     my %duedate=();
                    195:     my %opendate=();
                    196:     my %answerdate=();
1.25      albertel  197:     # need to always check part 0's open/due/answer status
1.51      bowersj2  198:     foreach (sort(split(/\,/,&Apache::lonnet::metadata($hash{'src_'.$rid},'allpo\ssiblekeys')))) {
1.15      www       199:         if ($_=~/^parameter\_(.*)\_opendate$/) {
1.51      bowersj2  200:             my $part=$1;
1.15      www       201:             $duedate{$part}=&parmval($part.'.duedate',$symb);
                    202:             $opendate{$part}=&parmval($part.'.opendate',$symb);
                    203:             $answerdate{$part}=&parmval($part.'.answerdate',$symb);
1.49      www       204:             if (&parmval($part.'.opendate.type',$symb) eq 'date_interval') {
1.51      bowersj2  205:                 $opendate{$part}=$duedate{$part}-$opendate{$part};
1.49      www       206:             }
1.50      www       207:             if (&parmval($part.'.answerdate.type',$symb) eq 'date_interval') {
1.49      www       208:                 $answerdate{$part}=$duedate{$part}+$answerdate{$part};
                    209:             }
1.15      www       210:         }
1.25      albertel  211:     }
1.11      www       212:     my $now=time;
                    213:     my $tcode=0;
1.16      www       214: 
                    215:     my %returnhash=&Apache::lonnet::restore($symb);
                    216: 
1.25      albertel  217:     foreach (sort(keys(%opendate))) {
1.51      bowersj2  218:         my $duedate=$duedate{$_};
                    219:         my $opendate=$opendate{$_};
                    220:         my $answerdate=$answerdate{$_};
                    221:         my $preface='';
                    222:         unless ($_ eq '0') { $preface=' Part: '.$_.' '; }
                    223:         if ($opendate) {
                    224:             if ($now<$duedate || (!$duedate)) {
                    225:                 unless ($tcode==4) { $tcode=2; }
                    226:                 if ($duedate) {
                    227:                     $ctext.=$preface.'Due: '.localtime($duedate);
                    228:                 } else {
                    229:                     $ctext.=$preface.'No Due Date';
                    230:                 }
                    231:                 if ($now<$opendate) {
                    232:                     unless ($tcode) { $tcode=1; }
                    233:                     $ctext.=$preface.'Open: '.localtime($opendate);
                    234:                 }
                    235:                 if ($duedate && $duedate-$now<86400) {
                    236:                     $tcode=4;
                    237:                     $ctext.=$preface.'Due: '.localtime($duedate);
                    238:                 }
                    239:             } else {
                    240:                 unless (($tcode==4) || ($tcode eq 2)) { $tcode=3; }
                    241:                 if ($now<$answerdate) {
                    242:                     $ctext.='Answer: '.localtime($duedate);
                    243:                 }
                    244:             }
                    245:         } else {
                    246:             unless (($tcode==2) || ($tcode==4)) { $tcode=1; }
                    247:         }
                    248:         
                    249:         my $status=$returnhash{'resource.'.$_.'.solved'};
                    250:         
                    251:         if ($status eq 'correct_by_student') {
                    252:             if ($code==0||$code==3) { $code=3; } else { $code=4; }
                    253:             $ctext.=' solved';
                    254:         } elsif ($status eq 'correct_by_override') {
                    255:             if ($code==0||$code==3) { $code=3; } else { $code=4; }
                    256:             $ctext.=' override';
                    257:         } elsif ($status eq 'incorrect_attempted') {
                    258:             if ($code!=4 && $code!=3) { $code=2; }
                    259:             if ($code==3) { $code=4; }
                    260:             $ctext.=' ('.
                    261:                 ($returnhash{'resource.'.$_.'.tries'}?
                    262:                  $returnhash{'resource.'.$_.'.tries'}:'0');
                    263:             my $numtries = &parmval($_.'.maxtries',$symb);
                    264:             if ($numtries) { $ctext.='/'.$numtries.' tries'; }
                    265:             $ctext.=')';
                    266:         } elsif ($status eq 'incorrect_by_override') {
                    267:             if ($code!=4 && $code!=3) { $code=2; }
                    268:             if ($code==3) { $code=4; }
                    269:             $ctext.=' override';
                    270:         } elsif ($status eq 'excused') {
                    271:             if ($code==0||$code==3) { $code=3; } else { $code=4; }
                    272:             $ctext.=' excused';
                    273:         } else {
                    274:             if ($code==0) { $code=1; }
                    275:         }
1.25      albertel  276:     }
1.16      www       277: 
1.11      www       278:     return 'p'.$code.$tcode.'"'.$ctext.'"';
1.9       www       279: }
                    280: 
1.2       www       281: 
1.31      albertel  282: sub addresource {
1.32      albertel  283:     my ($resource,$sofar,$rid,$showtypes,$indent,$linkid)=@_;
1.31      albertel  284:     if ($showtypes eq 'problems') {
1.51      bowersj2  285:         if ($resource!~/\.(problem|exam|quiz|assess|survey|form)$/) {
                    286:             return;
                    287:         }
1.31      albertel  288:     }
                    289:     my $brepriv=&Apache::lonnet::allowed('bre',$resource);
                    290:     if ($hash{'src_'.$rid}) {
1.51      bowersj2  291:         if (($brepriv eq '2') || ($brepriv eq 'F')) {
                    292:             my $pprefix='';
                    293:             if ($resource=~/\.(problem|exam|quiz|assess|survey|form)$/) {
                    294:                 $pprefix=&astatus($rid);
                    295:             }
                    296:             $$sofar++;
                    297:             if ($indent) { $pprefix='i'.$indent.','.$pprefix; }
                    298:             if ($linkid) { $pprefix='l'.$linkid.','.$pprefix; }
                    299:             if (defined($rows[$$sofar])) {
                    300:                 $rows[$$sofar].='&'.$pprefix.$rid;
                    301:             } else {
                    302:                 $rows[$$sofar]=$pprefix.$rid;
                    303:             }
                    304:         }
1.31      albertel  305:     }
                    306: }
                    307: 
                    308: sub followlinks () {
1.32      albertel  309:     my ($rid,$sofar,$beenhere,$further,$showtypes,$indent,$linkid)=@_;
1.31      albertel  310:     my $mincond=1;
                    311:     my $next='';
                    312:     foreach (split(/\,/,$hash{'to_'.$rid})) {
1.51      bowersj2  313:         my $thiscond=
                    314:             &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
                    315:         if ($thiscond>=$mincond) {
                    316:             if ($next) {
                    317:                 $next.=','.$_.':'.$thiscond;
                    318:             } else {
                    319:                 $next=$_.':'.$thiscond;
                    320:             }
                    321:             if ($thiscond>$mincond) { $mincond=$thiscond; }
                    322:         }
1.31      albertel  323:     }
1.32      albertel  324:     my $col=0;
                    325:     &Apache::lonxml::debug("following links -$next-");
1.31      albertel  326:     foreach (split(/\,/,$next)) {
1.51      bowersj2  327:         my ($nextlinkid,$condval)=split(/\:/,$_);
                    328:         if ($condval>=$mincond) {
                    329:             my $now=&tracetable($sofar,$hash{'goesto_'.$nextlinkid},
                    330:                                 $beenhere,$showtypes,$indent,$linkid);
                    331:             if ($now>$further) {                
                    332:                 if ($col>0) {
                    333:                     my $string;
                    334:                     for(my $i=0;$i<$col;$i++) { $string.='&'; }
                    335:                     for(my $i=$further+1;$now-1>$i;$i++) {
                    336:                         $rows[$i]=$string.$rows[$i];
                    337:                     }
                    338:                 }
                    339:                 $further=$now;
                    340:             }
                    341:         }
                    342:         $col++;
1.31      albertel  343:     }
                    344:     return $further;
                    345: }
                    346: # ------------------------------------------------------------ Build page table
                    347: 
                    348: sub tracetable {
1.32      albertel  349:     my ($sofar,$rid,$beenhere,$showtypes,$indent,$linkid)=@_;
                    350:     my $newshowtypes=$showtypes;
1.31      albertel  351:     my $further=$sofar;
1.44      www       352: # $Apache::lonxml::debug=1;
1.32      albertel  353:     &Apache::lonxml::debug("$rid ; $linkid ; $sofar ; $beenhere ; ".$hash{'src_'.$rid});
                    354:     if ($beenhere=~/\&$rid\&/) { return $further; }
                    355:     $beenhere.=$rid.'&';
1.31      albertel  356: 
                    357:     if (defined($hash{'is_map_'.$rid})) {
1.51      bowersj2  358:         $sofar++;
                    359:         my $tprefix='';
                    360:         if ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
                    361:             eq 'sequence') {
                    362:             $tprefix='h';
                    363:         } elsif ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
                    364:                  eq 'page') {
                    365:             $tprefix='j';
                    366:             if ($indent) { $tprefix='i'.$indent.','.$tprefix; }
                    367:             if ($linkid) { $tprefix='l'.$linkid.','.$tprefix; }
                    368:             $newshowtypes='problems';
                    369:             $indent++;
                    370:             #if in a .page continue to link the encompising .page
                    371:             if (!$linkid) { $linkid=$rid; }
                    372:         }
                    373:         if (defined($rows[$sofar])) {
                    374:             $rows[$sofar].='&'.$tprefix.$rid;
                    375:         } else {
                    376:             $rows[$sofar]=$tprefix.$rid;
                    377:         }
                    378:         if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
                    379:             (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
                    380:             my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
                    381:             $sofar=&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
                    382:                                '&'.$frid.'&',$newshowtypes,$indent,$linkid);
                    383:             &addresource($hash{'src_'.$frid},\$sofar,$frid,$newshowtypes,
                    384:                          $indent,$linkid);
                    385:             if ($tprefix =~ /j$/) { $indent--; $linkid=''; }
                    386:         }
1.31      albertel  387:     } else {
1.51      bowersj2  388:         &addresource($hash{'src_'.$rid},\$sofar,$rid,$showtypes,
                    389:                      $indent,$linkid);
1.31      albertel  390:     }
                    391: 
                    392:     if (defined($hash{'to_'.$rid})) {
1.51      bowersj2  393:         $further=&followlinks($rid,$sofar,$beenhere,$further,$showtypes,
                    394:                               $indent,$linkid);
1.2       www       395:     }
1.31      albertel  396: 
1.2       www       397:     return $further;
                    398: }
                    399: 
                    400: # ================================================================ Main Handler
1.1       www       401: 
                    402: sub handler {
1.28      albertel  403:     my $r=shift;
1.2       www       404: 
1.51      bowersj2  405:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                    406: 
                    407:     if ($ENV{'form.jtest'} ne "1")
                    408:     {
                    409:         return new_handle($r);
                    410:     }
1.2       www       411: 
                    412: # ------------------------------------------- Set document type for header only
                    413: 
1.28      albertel  414:     if ($r->header_only) {
1.51      bowersj2  415:         if ($ENV{'browser.mathml'}) {
                    416:             $r->content_type('text/xml');
                    417:         } else {
                    418:             $r->content_type('text/html');
                    419:         }
                    420:         $r->send_http_header;
                    421:         return OK;
1.28      albertel  422:     }
                    423:     my $requrl=$r->uri;
                    424:     my $hashtied;
1.2       www       425: # ----------------------------------------------------------------- Tie db file
1.28      albertel  426:     my $fn;
                    427:     if ($ENV{'request.course.fn'}) {
1.51      bowersj2  428:         $fn=$ENV{'request.course.fn'};
                    429:         if (-e "$fn.db") {
                    430:             if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) &&
                    431:                 (tie(%parmhash,'GDBM_File',
                    432:                      $ENV{'request.course.fn'}.'_parms.db',
                    433:                      &GDBM_READER(),0640))) {
                    434:                 $hashtied=1;
                    435:             }
                    436:         }
1.28      albertel  437:     }
                    438:     if (!$hashtied) {
1.51      bowersj2  439:         $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
                    440:         return HTTP_NOT_ACCEPTABLE; 
1.28      albertel  441:     }
                    442: 
1.2       www       443: # ------------------------------------------------------------------- Hash tied
1.28      albertel  444: 
                    445:     if ($ENV{'browser.mathml'}) {
1.51      bowersj2  446:         $r->content_type('text/xml');
1.28      albertel  447:     } else {
1.51      bowersj2  448:         $r->content_type('text/html');
1.28      albertel  449:     }
                    450:     &Apache::loncommon::no_cache($r);
                    451:     $r->send_http_header;
                    452: 
1.42      www       453:     my $firstres=$hash{'map_start_'.
                    454:            &Apache::lonnet::clutter($ENV{'request.course.uri'})};
                    455:     my $lastres=$hash{'map_finish_'.
                    456:            &Apache::lonnet::clutter($ENV{'request.course.uri'})};
1.28      albertel  457:     if (!(($firstres) && ($lastres))) {
1.51      bowersj2  458:         $r->print('<html><body>Coursemap undefined.</body></html>');
1.28      albertel  459:     } else {
                    460: 
1.2       www       461: # ----------------------------------------------------------------- Render page
1.10      www       462: # -------------------------------------------------------------- Set parameters
                    463: 
                    464: 
                    465: # ---------------------------- initialize coursedata and userdata for this user
1.51      bowersj2  466:         undef %courseopt;
                    467:         undef %useropt;
1.10      www       468: 
1.51      bowersj2  469:         my $uname=$ENV{'user.name'};
                    470:         my $udom=$ENV{'user.domain'};
                    471:         my $uhome=$ENV{'user.home'};
                    472:         my $cid=$ENV{'request.course.id'};
                    473:         my $chome=$ENV{'course.'.$cid.'.home'};
                    474:         my ($cdom,$cnum)=split(/\_/,$cid);
                    475: 
                    476:         my $userprefix=$uname.'_'.$udom.'_';
                    477:         
                    478:         unless ($uhome eq 'no_host') { 
1.48      bowersj2  479: # ------------------------------------------------- Get coursedata (if present)
1.51      bowersj2  480:             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                    481:                 my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                    482:                                                  ':resourcedata',$chome);
                    483:                 if ($reply!~/^error\:/) {
                    484:                     $courserdatas{$cid}=$reply;
                    485:                     $courserdatas{$cid.'.last_cache'}=time;
                    486:                 }
                    487:                 # check to see if network failed
                    488:                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                    489:                 {
                    490:                     $networkFailedFlag = 1;
                    491:                 }
                    492:             }
                    493:             foreach (split(/\&/,$courserdatas{$cid})) {
                    494:                 my ($name,$value)=split(/\=/,$_);
                    495:                 $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
                    496:                     &Apache::lonnet::unescape($value);
                    497:             }
1.10      www       498: # --------------------------------------------------- Get userdata (if present)
1.51      bowersj2  499:             unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
                    500:                 my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
                    501:                 if ($reply!~/^error\:/) {
                    502:                     $userrdatas{$uname.'___'.$udom}=$reply;
                    503:                     $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
                    504:                 }
                    505:             }
                    506:             foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
                    507:                 my ($name,$value)=split(/\=/,$_);
                    508:                 $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
                    509:                     &Apache::lonnet::unescape($value);
                    510:             }
                    511:         }
1.28      albertel  512: 
1.51      bowersj2  513:         @rows=();
1.28      albertel  514: 
1.51      bowersj2  515:         &tracetable(0,$firstres,'&','',0);
1.2       www       516: 
                    517: # ------------------------------------------------------------------ Page parms
                    518: 
1.51      bowersj2  519:         my $j;
                    520:         my $i;
                    521:         my $lcm=1;
                    522:         my $contents=0;
1.2       www       523: 
                    524: # ---------------------------------------------- Go through table to get layout
                    525: 
1.51      bowersj2  526:         for ($i=0;$i<=$#rows;$i++) {
                    527:             if ($rows[$i]) {
                    528:                 &Apache::lonxml::debug("Row $i is:".$rows[$i]);
                    529:                 $contents++;
                    530:                 my @colcont=split(/\&/,$rows[$i]);
                    531:                 $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
                    532:             } 
                    533:         }
1.5       www       534: 
1.2       www       535: 
1.51      bowersj2  536:         unless ($contents) {
                    537:             $r->print('<html><body>Empty Map.</body></html>');
                    538:         } else {
1.10      www       539: 
1.2       www       540: # ------------------------------------------------------------------ Build page
                    541: 
1.51      bowersj2  542:             my $currenturl=$ENV{'form.postdata'};
                    543:             $currenturl=~s/^http\:\/\///;
                    544:             $currenturl=~s/^[^\/]+//;
1.13      www       545: 
1.2       www       546: # ---------------------------------------------------------------- Send headers
                    547: 
1.51      bowersj2  548:             my $date=localtime;
                    549:             my $now=time;
1.21      www       550: # ----------------------------------------- Get email status and discussiontime
                    551: 
1.51      bowersj2  552:             my %emailstatus=&Apache::lonnet::dump('email_status');
                    553:             my $logouttime=$emailstatus{'logout'};
                    554:             my $courseleave=$emailstatus{'logout_'.$ENV{'request.course.id'}};
                    555:             my $lastcheck=($courseleave>$logouttime?$courseleave:$logouttime);
                    556: 
                    557:             my %discussiontimes=&Apache::lonnet::dump('discussiontimes',
                    558:                                                           $cdom,$cnum);
                    559: 
                    560:             my %feedback=();
                    561:             my %error=();
                    562:             foreach my $msgid (split(/\&/,&Apache::lonnet::reply('keys:'.
                    563:                                                                  $ENV{'user.domain'}.':'.
                    564:                                                                  $ENV{'user.name'}.':nohist_email',
                    565:                                                                  $ENV{'user.home'}))) {
                    566:                 $msgid=&Apache::lonnet::unescape($msgid);
                    567:                 my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
                    568:                 if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
                    569:                     my ($what,$url)=($1,$2);
                    570:                     my %status=
                    571:                         &Apache::lonnet::get('email_status',[$msgid]);
                    572:                     if ($status{$msgid}=~/^error\:/) { 
                    573:                         $status{$msgid}=''; 
                    574:                     }
                    575:                         
                    576:                     if (($status{$msgid} eq 'new') || 
                    577:                         (!$status{$msgid})) { 
                    578:                         if ($what eq 'Error') {
                    579:                             $error{$url}.=','.$msgid; 
                    580:                         } else {
                    581:                             $feedback{$url}.=','.$msgid;
                    582:                         }
                    583:                     }
                    584:                 }
                    585:             }
1.22      www       586: # ----------------------------------------------------------- Start Page Output
1.43      www       587:             my $bodytagadd='';
1.51      bowersj2  588:             $r->print(
1.43      www       589:                    '<html><head><title>Navigate Course Map</title></head>');
1.51      bowersj2  590:             if (($currenturl=~/^\/res/) &&
                    591:                 ($currenturl!~/^\/res\/adm/)) {
                    592:                 $bodytagadd='onLoad="window.location.hash='."'curloc'".'"';
                    593:             }
                    594:             $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
1.43      www       595:                                                   $bodytagadd));
1.51      bowersj2  596:             $r->print('<script>window.focus();</script>');
                    597:             my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
                    598:             if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }
                    599:             $r->print("<h3>$date</h3>\n");
                    600:             $r->rflush();
                    601:             $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.
                    602:                       localtime($lastcheck).
                    603:                       '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'); 
                    604:             if (($currenturl=~/^\/res/) &&
                    605:                 ($currenturl!~/^\/res\/adm/)) {
                    606:                 $r->print('<a href="#curloc">Current Location</a><p>');
                    607:             }
                    608: 
                    609:             # Handle a network error
                    610: 
                    611:             if ($networkFailedFlag)
                    612:             {
                    613:                 $r->print('<H2>LON-CAPA network failure.</H2>'."\n");
                    614:                 $r->print("<p>LON-CAPA's network is having difficulties, some problem" .
                    615:                           " information, such as due dates, will not be available.");
                    616:             }
1.13      www       617: # ----------------------------------------------------- The little content list
1.51      bowersj2  618:             for ($i=0;$i<=$#rows;$i++) {
                    619:                 if ($rows[$i]) {
                    620:                     my @colcont=split(/\&/,$rows[$i]);
                    621:                     my $avespan=$lcm/($#colcont+1);
                    622:                     for ($j=0;$j<=$#colcont;$j++) {
                    623:                         my $rid=$colcont[$j];
                    624:                         if ($rid=~/^h(.+)/) {
                    625:                             $rid=$1;
                    626:                             $r->print('&nbsp;&nbsp;&nbsp;<a href="#'.
                    627:                                       $rid.'">'.$hash{'title_'.$rid}.
                    628:                                       '</a><br>');
                    629:                         }
                    630:                     }
                    631:                 }
                    632:             }
1.2       www       633: # ----------------------------------------------------------------- Start table
1.51      bowersj2  634:             $r->print('<hr><table cols="'.$lcm.'" border="0">');
                    635:             for ($i=0;$i<=$#rows;$i++) {
                    636:                 if ($rows[$i]) {
                    637:                     $r->print("\n<tr>");
                    638:                     my @colcont=split(/\&/,$rows[$i]);
                    639:                     my $avespan=$lcm/($#colcont+1);
                    640: 
                    641:                     # for each item I wish to print on this row...
                    642:                     for ($j=0;$j<=$#colcont;$j++) {
                    643:                         my $indent;my $indentstr;
                    644:                         my $linkid;
                    645:                         my $rid=$colcont[$j];
1.36      www       646:                         $rid=~/(\d+)\.(\d+)$/;
1.51      bowersj2  647:                         my $src=
                    648:                            &Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
                    649:                         my $symb=
                    650:           &Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.$src;
                    651:                         my $add='<td>';
                    652:                         my $adde='</td>';
                    653:                         my $hwk='<font color="#223322">';
                    654:                         my $hwke='</font>';
                    655:                         if ($rid=~/^l(\d+\.\d+),(.+)/) { $linkid=$1; $rid=$2; }
                    656:                         if ($rid=~/^i(\d+),(.+)/) { $indent=$1; $rid=$2; }
                    657:                         if ($rid=~/^h(.+)/) {
                    658:                             $rid=$1;
                    659:                             $add='<th bgcolor="#AAFF55"><a name="'.$rid.'">';
                    660:                             $adde='</th>';
1.36      www       661:                             if (($ENV{'user.adv'}) && 
1.51      bowersj2  662:                                 ($parmhash{$symb.'.0.parameter_randompick'})) {
1.36      www       663:                                $adde=' (randomly select '.
1.51      bowersj2  664:                                    $parmhash{$symb.'.0.parameter_randompick'}.
1.36      www       665:                                    ')</th>';
                    666:                             }
1.51      bowersj2  667:                         }
                    668:                         if ($rid=~/^j(.+)/) { $rid=$1; }
                    669:                         if ($rid=~/^p(\d)(\d)\"([\w\: \(\)\/\,]*)\"(.+)/) {
                    670:                             # sub astatus describes what code/tcode mean
                    671:                             my $code=$1;
                    672:                             my $tcode=$2;
                    673:                             my $ctext=$3;
                    674:                             $rid=$4;
                    675:                             
                    676:                             # will open later
                    677:                             if ($tcode eq '1') { 
                    678:                                 $add='<td bgcolor="#AAAAAA">';
                    679:                             }
                    680: 
                    681:                             # solved/correct
                    682:                             if ($code eq '3') {
                    683:                                 $add='<td bgcolor="#AAFFAA">';
                    684:                             } elsif ($code eq '4') { # partially correct
                    685:                                 $add='<td bgcolor="#E0FFAA">';
                    686:                             } else {
                    687:                                 # not attempted
                    688:                                 
                    689:                                 # we end up here on network failure, so pick a neutral
                    690:                                 # color if the network failed instead of bright red.
                    691:                                 if ( $networkFailedFlag )
                    692:                                 {
                    693:                                     $add = '<td bgcolor="#AAAAAA">';
                    694:                                 }
                    695:                                 else
                    696:                                 {
                    697:                                     $add='<td bgcolor="#FFAAAA">';
                    698:                                 }
                    699: 
                    700:                                 if ($tcode eq '2') { # open, not past due
                    701:                                     $add='<td bgcolor="#FFFFAA">';
                    702:                                 }
                    703: 
                    704:                                 if ($tcode eq '4') { # due in next 24 hours
                    705:                                     $add='<td bgcolor="#FFFF33">';
                    706:                                     $adde='</td>';
                    707:                                 }
                    708:                             }
                    709:                             $hwk='<font color="#888811"><b>';
                    710:                             $hwke='</b></font>';
                    711:                             if ($code eq '1') {
                    712:                                 $hwke='</b> ('.$ctext.')</font>';
                    713:                             }
                    714:                             if ($code eq '2' || $code eq '4') {
                    715:                                 $hwk='<font color="#992222"><b>';
                    716:                                 $hwke='</b> ('.$ctext.')</font>';
                    717:                             }
                    718:                             if ($code eq '3') {
                    719:                                 $hwk='<font color="#229922"><b>';
                    720:                                 $hwke='</b> ('.$ctext.')</font>';
                    721:                             }
                    722:                             if ($networkFailedFlag) 
                    723:                             {
                    724:                                 $hwke='</b> (status unavailable)</font>';
                    725:                             }
                    726:                         }
                    727:                         if ($rid && $hash{'src_'.$rid} eq $currenturl) {
                    728:                             $add=$add.'<a name="curloc"></a>'.
                    729:                                 '<font color=red size=+2><b>&gt; </b></font>';
                    730:                             $adde=
                    731:                                 '<font color=red size=+2><b> &lt;</b></font>'.$adde;
                    732:                         }
                    733:                         if ($discussiontimes{$symb}>$lastcheck) {
                    734:                             $adde=
                    735:                                 '<img border=0 src="/adm/lonMisc/chat.gif">'.
                    736:                                     $adde;
                    737:                         }
                    738:                         if ($error{$src}) {
                    739:                             foreach (split(/\,/,$error{$src})) {
                    740:                                 if ($_) {
                    741:                                     $adde=
                    742:                                         '&nbsp;<a href="/adm/email?display='.
                    743:                                             &Apache::lonnet::escape($_).
                    744:                                                 '"><img src="/adm/lonMisc/bomb.gif" border=0></a>'
                    745:                                                     .$adde;
                    746:                                 }
                    747:                             }
                    748:                         }
                    749:                         if ($feedback{$src}) {
                    750:                             foreach (split(/\,/,$feedback{$src})) {
                    751:                                 if ($_) {
                    752:                                     $adde=
                    753:                                         '&nbsp;<a href="/adm/email?display='.
                    754:                                             &Apache::lonnet::escape($_).
                    755:                                                 '"><img src="/adm/lonMisc/feedback.gif" border=0></a>'
                    756:                                                     .$adde;
                    757:                                 }
                    758:                             }
                    759:                         }
                    760:                         if ($indent) {
                    761:                             my $is="&nbsp;&nbsp;";
                    762:                             for(my $i=-1;$i<$indent;$i++) { $indentstr.=$is; }
                    763:                         }
                    764:                         if (!$linkid) { $linkid=$rid; }
1.38      www       765:                         if ($hash{'randomout_'.$rid}) {
                    766:                             $adde=' <i>(hidden)</i>'.$adde;
                    767:                         }
1.51      bowersj2  768:                         $r->print($add.$indentstr);
                    769:                         if ($rid) {
                    770:                             $r->print('<a href="'.$hash{'src_'.$linkid}.
1.39      www       771:                                       (($hash{'src_'.$linkid}=~/\?/)?'&':'?').
                    772:                                       'symb='.&Apache::lonnet::escape($symb)
1.35      www       773:                                        .'">'.
1.51      bowersj2  774:                                       $hwk.$hash{'title_'.$rid}.$hwke.'</a>');
                    775:                         }
                    776:                         $r->print($adde);
                    777:                     }
                    778:                     $r->print('</tr>');
                    779:                 }
                    780:             }
                    781:             $r->print("\n</table>");
                    782:             $r->print('</body></html>');
1.2       www       783: # -------------------------------------------------------------------- End page
1.51      bowersj2  784:         }                  
1.2       www       785: # ------------------------------------------------------------- End render page
1.28      albertel  786:     }
1.2       www       787: # ------------------------------------------------------------------ Untie hash
1.28      albertel  788:     unless (untie(%hash)) {
1.51      bowersj2  789:         &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    790:                                  "Could not untie coursemap $fn (browse).</font>"); 
1.28      albertel  791:     }
                    792:     unless (untie(%parmhash)) {
1.51      bowersj2  793:         &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    794:                                  "Could not untie parmhash (browse).</font>"); 
1.28      albertel  795:     }
                    796:     return OK;
1.2       www       797: }
1.1       www       798: 
1.51      bowersj2  799: sub new_handle {
                    800:     my $r = shift;
                    801: 
                    802:     # Handle header-only request
                    803:     if ($r->header_only) {
                    804:         if ($ENV{'browser.mathml'}) {
                    805:             $r->content_type('text/xml');
                    806:         } else {
                    807:             $r->content_type('text/html');
                    808:         }
                    809:         $r->send_http_header;
                    810:         return OK;
                    811:     }
                    812: 
                    813:     # Send header, don't cache this page
                    814:     if ($ENV{'browser.mathml'}) {
                    815:         $r->content_type('text/xml');
                    816:     } else {
                    817:         $r->content_type('text/html');
                    818:     }
                    819:     &Apache::loncommon::no_cache($r);
                    820:     $r->send_http_header;
                    821: 
                    822:     # Header
                    823:     $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
                    824:                                           ''));
                    825:     # Initialize the nav map
                    826:     my $navmap = Apache::lonnavmaps::navmap->new(
                    827:                         $ENV{"request.course.fn"}.".db",
                    828:                         $ENV{"request.course.fn"}."_parms.db", 1);
                    829: 
1.55      bowersj2  830: 
                    831:     if (!defined($navmap)) {
                    832:         my $requrl = $r->uri;
                    833:         $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
                    834:         return HTTP_NOT_ACCEPTABLE;
                    835:     }
                    836: 
                    837:     # Check that it's defined
                    838:     if (!($navmap->courseMapDefined())) {
                    839:         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
                    840:                   '</body></html>');
                    841:         return OK;
                    842:     }
                    843: 
1.51      bowersj2  844:     # Grab a resource object so we have access to the constants; this
                    845:     # is technically not proper, but should be harmless
                    846:     my $res = $navmap->firstResource();
                    847: 
                    848:     # Defines a status->color mapping, null string means don't color
                    849:     my %colormap = 
1.54      bowersj2  850:     ( $res->NETWORK_FAILURE        => '',
                    851:       $res->CORRECT                => '#BBFFBB',
                    852:       $res->EXCUSED                => '#BBBBFF',
                    853:       $res->PAST_DUE_ANSWER_LATER  => '#FFAA00',
                    854:       $res->PAST_DUE_NO_ANSWER     => '#FFAA00',
                    855:       $res->ANSWER_OPEN            => '#FF00AA',
                    856:       $res->OPEN_LATER             => '',
                    857:       $res->TRIES_LEFT             => '#FFFF00',
                    858:       $res->INCORRECT              => '#FFAA00',
                    859:       $res->OPEN                   => '#FFFF88',
                    860:       $res->NOTHING_SET            => ''        );
1.51      bowersj2  861: 
                    862:     my %filterHash;
                    863:     # Figure out what we're not displaying
                    864:     foreach (split(/\,/, $ENV{"form.filter"})) {
                    865:         if ($_) {
                    866:             $filterHash{$_} = "1";
                    867:         }
                    868:     }
                    869: 
                    870:     # Begin the HTML table
                    871:     # two columns: the title/icon on the left, the info on the right
                    872:     $r->print('<table cellspacing="3" cellpadding="0" bgcolor="#FFFFFF">' ."\n");
                    873: 
                    874:     my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash);
                    875:     my $curRes = $mapIterator->next();
1.53      bowersj2  876:     undef $res; # so we don't accidentally use it later
1.51      bowersj2  877:     my $indentLevel = -1;
                    878:     my $indentString = "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
                    879: 
                    880:     my $isNewBranch = 0;
                    881: 
                    882:     while ($curRes != $mapIterator->END_NAV_MAP) {
                    883:         if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52      bowersj2  884:             $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51      bowersj2  885:             $indentLevel++;
                    886:         }
                    887:         if ($curRes == $mapIterator->END_MAP() ||
1.52      bowersj2  888:             $curRes == $mapIterator->END_BRANCH()) {
1.51      bowersj2  889:             $indentLevel--;
                    890:         }
1.52      bowersj2  891:         if ($curRes == $mapIterator->BEGIN_BRANCH()) {
                    892:             $isNewBranch = 1;
1.51      bowersj2  893:         }
                    894: 
                    895:         if (ref($curRes) && $curRes->src()) {
                    896: 
                    897:             my @parts;
                    898:             if ($curRes->is_problem()) {
                    899:                 @parts = @{$curRes->parts()};
                    900:                 if (scalar(@parts) > 1) { shift(@parts); }
                    901:             } else {
                    902:                 @parts[0] = "0"; # this is to get past foreach loop below
                    903:                  # you can consider a non-problem resource as a resource
                    904:                  # with only one part without loss
                    905:             }
                    906: 
                    907:             foreach my $part (@parts) {
                    908:                 
                    909:                 # For each thing we're displaying...
                    910: 
                    911:                 my $stack = $mapIterator->getStack();
                    912:                 my $src = getLinkForResource($stack);
                    913: 
                    914:                 my $srcHasQuestion = $src =~ /\?/;
                    915:                 my $link = $src.
                    916:                     ($srcHasQuestion?'&':'?') .
                    917:                     'symb='.&Apache::lonnet::escape($curRes->symb()).
                    918:                     '"';
                    919:                 my $title = $curRes->title();
                    920:                 my $partLabel = "";
1.52      bowersj2  921:                 my $newBranchText = "";
                    922: 
                    923:                 # If this is a new branch, label it so
                    924:                 # (temporary, this should be an icon w/ alt text)
                    925:                 if ($isNewBranch) {
                    926:                     $newBranchText = "NB -> ";
                    927:                     $isNewBranch = 0;
                    928:                 }
1.51      bowersj2  929: 
                    930:                 # links to open and close the folders
                    931:                 my $linkopen = "<a href=\"$link\">";
                    932:                 my $linkclose = "</a>";
                    933: 
                    934:                 my $icon = "html.gif";
                    935:                 if ($curRes->is_problem()) { 
                    936:                     $icon = "problem.gif"; 
                    937:                 }
                    938: 
                    939:                 # Display the correct icon, link to open or shut map
                    940:                 if ($curRes->is_map()) { 
                    941:                     my $mapId = $curRes->map_pc();
                    942:                     my $nowOpen = !defined($filterHash{$mapId});
                    943:                     $icon = $nowOpen ?
                    944:                         "folder_opened.gif" : "folder_closed.gif";
1.52      bowersj2  945:                     $linkopen = "<a href=\"/adm/navmaps?filter=";
1.51      bowersj2  946:                     $linkopen .= $nowOpen ? 
                    947:                         addToFilter(\%filterHash, $mapId) :
                    948:                         removeFromFilter(\%filterHash, $mapId);
                    949:                     $linkopen .= "\">";
                    950:                     $linkclose = "</a>";
                    951:                     
                    952:                 }
                    953:                 
                    954:                 my $colorizer = "";
                    955:                 if ($curRes->is_problem()) {
                    956:                     my $status = $curRes->status($part);
                    957:                     my $color = $colormap{$status};
                    958:                     if ($color ne "") {
                    959:                         $colorizer = "bgcolor=\"$color\"";
                    960:                     }
                    961:                 }
                    962: 
                    963:                 $r->print("  <tr><td align=\"left\" valign=\"top\">\n");
                    964: 
                    965:                 # print indentation
                    966:                 for (my $i = 0; $i < $indentLevel; $i++) {
                    967:                     $r->print($indentString);
                    968:                 }
                    969: 
1.52      bowersj2  970:                 $r->print("  ${newBranchText}${linkopen}<img border=\"0\" src=\"" .
1.51      bowersj2  971:                           "/adm/lonIcons/$icon\" alt=\"\">${linkclose}\n");
                    972: 
                    973:                 if ($curRes->is_problem() && $part != "0") { $partLabel = " (Part $part)"; }
                    974: 
                    975:                 $r->print("  <a href=\"$link\">$title$partLabel</a></td>".
                    976:                           "<td $colorizer align=\"right\">\n");
                    977:                 
                    978:                 if ($curRes->kind() eq "res" and 
                    979:                     $curRes->is_problem() ) {
1.53      bowersj2  980:                     $r->print (getDescription($curRes, $part));
1.51      bowersj2  981:                 }
                    982:             }
                    983:         }
                    984:         $curRes = $mapIterator->next();
                    985:     }
                    986: 
                    987:     $r->print("</table></body></html>");
                    988: 
                    989:     return OK;
                    990: }
                    991: 
                    992: # Convenience functions: Returns a string that adds or subtracts
                    993: # the second argument from the first hash, appropriate for the 
                    994: # query string that determines which folders to recurse on
                    995: sub addToFilter {
                    996:     my $hashIn = shift;
                    997:     my $addition = shift;
                    998:     my %hash = %$hashIn;
                    999:     $hash{$addition} = 1;
                   1000: 
                   1001:     return join (",", keys(%hash));
                   1002: }
                   1003: 
                   1004: sub removeFromFilter {
                   1005:     my $hashIn = shift;
                   1006:     my $subtraction = shift;
                   1007:     my %hash = %$hashIn;
                   1008: 
                   1009:     delete $hash{$subtraction};
                   1010:     return join(",", keys(%hash));
                   1011: }
                   1012: 
                   1013: # Convenience function: Given a stack returned from getStack on the iterator,
                   1014: # return the correct src() value.
                   1015: # Later, this should add an anchor when we start putting anchors in pages.
                   1016: sub getLinkForResource {
                   1017:     my $stack = shift;
                   1018:     my $res;
                   1019: 
                   1020:     # Check to see if there are any pages in the stack
                   1021:     foreach $res (@$stack) {
                   1022:         if (defined($res) && $res->is_page()) {
                   1023:             return $res->src();
                   1024:         }
                   1025:     }
                   1026: 
                   1027:     # Failing that, return the src of the last resource that is defined
                   1028:     # (when we first recurse on a map, it puts an undefined resource
                   1029:     # on the bottom because $self->{HERE} isn't defined yet, and we
                   1030:     # want the src for the map anyhow)
                   1031:     foreach (@$stack) {
                   1032:         if (defined($_)) { $res = $_; }
                   1033:     }
                   1034: 
                   1035:     return $res->src();
                   1036: }
                   1037: 
1.53      bowersj2 1038: # Convenience function: This seperates the logic of how to create
                   1039: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
                   1040: # etc.) into a seperate function. It takes a resource object as the
                   1041: # first parameter, and the part number of the resource as the second.
                   1042: # It's basically a big switch statement on the status of the resource.
                   1043: 
                   1044: sub getDescription {
                   1045:     my $res = shift;
                   1046:     my $part = shift;
                   1047:     my $status = $res->getDateStatus();
                   1048: 
                   1049:     if ($status == $res->NETWORK_FAILURE) { return ""; }
                   1050:     if ($status == $res->NOTHING_SET) {
                   1051:         return "Not currently assigned.";
                   1052:     }
                   1053:     if ($status == $res->OPEN_LATER) {
                   1054:         return "Opens: " . timeToHumanString($res->opendate($part));
                   1055:     }
                   1056:     if ($status == $res->OPEN) {
1.54      bowersj2 1057:         return "Due: $status " . timeToHumanString($res->duedate($part));
1.53      bowersj2 1058:     }
1.54      bowersj2 1059:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
                   1060:         return "Answer: " . timeToHumanString($res->answerdate($part));
                   1061:     }
                   1062:     if ($status == $res->PAST_DUE_NO_ANSWER) {
                   1063:         return "Was Due: " . timeToHumanString($res->duedate($part));
1.53      bowersj2 1064:     }
                   1065:     if ($status == $res->ANSWER_OPEN) {
                   1066:         return "Answer available";
                   1067:     }
                   1068: }
                   1069: 
                   1070: # I want to change this into something more human-friendly. For
                   1071: # now, this is a simple call to localtime. The final function
                   1072: # probably belongs in loncommon.
                   1073: sub timeToHumanString {
                   1074:     return localtime(shift);
                   1075: }
                   1076: 
1.51      bowersj2 1077: 1;
                   1078: 
                   1079: package Apache::lonnavmaps::navmap;
                   1080: 
                   1081: # LEFT:
                   1082: # * Actual handler code (multi-part)
                   1083: # * Branches (aieee!) (and conditionals)
                   1084: 
                   1085: =pod
                   1086: 
                   1087: 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.
                   1088: 
                   1089: =head1 navmap object: Encapsulating the compiled nav map
                   1090: 
                   1091: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
                   1092: 
                   1093: Most notably it provides a way to navigate the map sensibly and a flexible iterator that makes it easy to write various renderers based on nav maps.
                   1094: 
                   1095: You must obtain resource objects through the navmap object.
                   1096: 
                   1097: =head2 Methods
                   1098: 
                   1099: =over 4
                   1100: 
1.55      bowersj2 1101: =item * B<new>(filename, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled course representation and parmHashFile. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.
1.51      bowersj2 1102: 
                   1103: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
                   1104: 
                   1105: =cut
                   1106: 
                   1107: use strict;
                   1108: use GDBM_File;
                   1109: 
                   1110: sub new {
                   1111:     # magic invocation to create a class instance
                   1112:     my $proto = shift;
                   1113:     my $class = ref($proto) || $proto;
                   1114:     my $self = {};
                   1115: 
                   1116:     $self->{NAV_HASH_FILE} = shift;
                   1117:     $self->{PARM_HASH_FILE} = shift;
                   1118:     $self->{GENERATE_COURSE_USER_OPT} = shift;
1.55      bowersj2 1119:     $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1.51      bowersj2 1120: 
                   1121:     # Resource cache stores navmapresource's as we reference them. We generate
                   1122:     # them on-demand so we don't pay for creating resources unless we use them.
                   1123:     $self->{RESOURCE_CACHE} = {};
                   1124: 
                   1125:     # Network failure flag, if we accessed the course or user opt and
                   1126:     # failed
                   1127:     $self->{NETWORK_FAILURE} = 0;
                   1128: 
                   1129:     # tie the nav hash
                   1130:     my %navmaphash;
                   1131:     if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
                   1132:               &GDBM_READER(), 0640))) {
                   1133:         return undef;
                   1134:     }
                   1135:     $self->{NAV_HASH} = \%navmaphash;
                   1136:     
                   1137:     my %parmhash;
                   1138:     if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
                   1139:               &GDBM_READER(), 0640)))
                   1140:     {
                   1141:         return undef;
                   1142:     }
                   1143:     $self->{PARM_HASH} = \%parmhash;
                   1144:     $self->{HASH_TIED} = 1;
                   1145: 
                   1146:     # If the course opt hash and the user opt hash should be generated,
                   1147:     # generate them
                   1148:     if ($self->{GENERATE_COURSE_USER_OPT}) {
                   1149:         my $uname=$ENV{'user.name'};
                   1150:         my $udom=$ENV{'user.domain'};
                   1151:         my $uhome=$ENV{'user.home'};
                   1152:         my $cid=$ENV{'request.course.id'};
                   1153:         my $chome=$ENV{'course.'.$cid.'.home'};
                   1154:         my ($cdom,$cnum)=split(/\_/,$cid);
                   1155:         
                   1156:         my $userprefix=$uname.'_'.$udom.'_';
                   1157:         
                   1158:         my %courserdatas; my %useropt; my %courseopt;
                   1159:         unless ($uhome eq 'no_host') { 
                   1160: # ------------------------------------------------- Get coursedata (if present)
                   1161:             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                   1162:                 my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                   1163:                                                  ':resourcedata',$chome);
                   1164:                 if ($reply!~/^error\:/) {
                   1165:                     $courserdatas{$cid}=$reply;
                   1166:                     $courserdatas{$cid.'.last_cache'}=time;
                   1167:                 }
                   1168:                 # check to see if network failed
                   1169:                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                   1170:                 {
                   1171:                     $self->{NETWORK_FAILURE} = 1;
                   1172:                 }
                   1173:             }
                   1174:             foreach (split(/\&/,$courserdatas{$cid})) {
                   1175:                 my ($name,$value)=split(/\=/,$_);
                   1176:                 $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
                   1177:                     &Apache::lonnet::unescape($value);
                   1178:             }
                   1179: # --------------------------------------------------- Get userdata (if present)
                   1180:             unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
                   1181:                 my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
                   1182:                 if ($reply!~/^error\:/) {
                   1183:                     $userrdatas{$uname.'___'.$udom}=$reply;
                   1184:                     $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
                   1185:                 }
                   1186:                 # check to see if network failed
                   1187:                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                   1188:                 {
                   1189:                     $self->{NETWORK_FAILURE} = 1;
                   1190:                 }
                   1191:             }
                   1192:             foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
                   1193:                 my ($name,$value)=split(/\=/,$_);
                   1194:                 $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
                   1195:                     &Apache::lonnet::unescape($value);
                   1196:             }
1.55      bowersj2 1197:             $self->{COURSE_OPT} = \%courseopt;
                   1198:             $self->{USER_OPT} = \%useropt;
1.51      bowersj2 1199:         }
                   1200:     }   
                   1201: 
1.55      bowersj2 1202:     if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
                   1203:         my $cid=$ENV{'request.course.id'};
                   1204:         my ($cdom,$cnum)=split(/\_/,$cid);
                   1205:         
                   1206:         my %emailstatus = &Apache::lonnet::dump('email_status');
1.56    ! bowersj2 1207:         my $logoutTime = $emailstatus{'logout'};
        !          1208:         my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.55      bowersj2 1209:         $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?
                   1210:                                $courseLeaveTime : $logoutTime);
1.56    ! bowersj2 1211:         my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
1.55      bowersj2 1212:                                                    $cdom, $cnum);
                   1213:         my %feedback=();
                   1214:         my %error=();
                   1215:         my $keys = &Apache::lonnet::reply('keys:'.
                   1216:                                           $ENV{'user.domain'}.':'.
                   1217:                                           $ENV{'user.name'}.':nohist_email',
                   1218:                                           $ENV{'user.home'});
                   1219: 
                   1220:         foreach my $msgid (split(/\&/, $keys)) {
                   1221:             $msgid=&Apache::lonnet::unescape($msgid);
                   1222:             my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
                   1223:             if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
                   1224:                 my ($what,$url)=($1,$2);
                   1225:                 my %status=
                   1226:                     &Apache::lonnet::get('email_status',[$msgid]);
                   1227:                 if ($status{$msgid}=~/^error\:/) { 
                   1228:                     $status{$msgid}=''; 
                   1229:                 }
                   1230:                 
                   1231:                 if (($status{$msgid} eq 'new') || 
                   1232:                     (!$status{$msgid})) { 
                   1233:                     if ($what eq 'Error') {
                   1234:                         $error{$url}.=','.$msgid; 
                   1235:                     } else {
                   1236:                         $feedback{$url}.=','.$msgid;
                   1237:                     }
                   1238:                 }
                   1239:             }
                   1240:         }
                   1241:         
                   1242:         $self->{FEEDBACK} = \%feedback;
                   1243:         $self->{ERROR_MSG} = \%error; # what is this? JB
                   1244:         $self->{DISCUSSION_TIME} = \%discussiontime;
                   1245:         $self->{EMAIL_STATUS} = \%emailstatus;
                   1246:         
                   1247:     }    
                   1248:     
1.51      bowersj2 1249:     bless($self);
1.55      bowersj2 1250:         
                   1251:     return $self;
                   1252: }
1.51      bowersj2 1253: 
1.55      bowersj2 1254: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   1255: sub courseMapDefined {
                   1256:     my $self = shift;
                   1257:     my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
                   1258: 
1.56    ! bowersj2 1259:     my $firstres = $self->{NAV_HASH}->{"map_start_$uri"};
        !          1260:     my $lastres = $self->{NAV_HASH}->{"map_finish_$uri"};
1.55      bowersj2 1261:     return $firstres && $lastres;
1.51      bowersj2 1262: }
                   1263: 
                   1264: sub getIterator {
                   1265:     my $self = shift;
                   1266:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
                   1267:                                                      shift, shift);
                   1268:     return $iterator;
                   1269: }
                   1270: 
                   1271: # unties the hash when done
                   1272: sub untieHashes {
                   1273:     my $self = shift;
                   1274:     untie $self->{NAV_HASH} if ($self->{HASH_TIED});
                   1275:     untie $self->{PARM_HASH} if ($self->{HASH_TIED});
                   1276:     $self->{HASH_TIED} = 0;
                   1277: }
                   1278: 
                   1279: # when the object is destroyed, be sure to untie all the hashes we tied.
                   1280: sub DESTROY {
                   1281:     my $self = shift;
                   1282:     $self->untieHashes();
                   1283: }
                   1284: 
                   1285: =pod
                   1286: 
                   1287: =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.
                   1288: 
                   1289: =cut
                   1290: 
                   1291: # The strategy here is to cache the resource objects, and only construct them
                   1292: # as we use them. The real point is to prevent reading any more from the tied
                   1293: # hash then we have to, which should hopefully alleviate speed problems.
                   1294: # Caching is just an incidental detail I throw in because it makes sense.
                   1295: 
                   1296: sub getById {
                   1297:     my $self = shift;
                   1298:     my $id = shift;
                   1299: 
                   1300:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   1301:     {
                   1302:         return $self->{RESOURCE_CACHE}->{$id};
                   1303:     }
                   1304: 
                   1305:     # resource handles inserting itself into cache.
                   1306:     return Apache::lonnavmaps::resource->new($self, $id);
                   1307: }
                   1308: 
                   1309: =pod
                   1310: 
                   1311: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
                   1312: 
                   1313: =cut
                   1314: 
                   1315: sub firstResource {
                   1316:     my $self = shift;
                   1317:     my $firstResource = $self->{NAV_HASH}->{'map_start_' .
                   1318:                      &Apache::lonnet::clutter($ENV{'request.course.uri'})};
                   1319:     return $self->getById($firstResource);
                   1320: }
                   1321: 
                   1322: =pod
                   1323: 
                   1324: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
                   1325: 
                   1326: =cut
                   1327: 
                   1328: sub finishResource {
                   1329:     my $self = shift;
                   1330:     my $firstResource = $self->{NAV_HASH}->{'map_finish_' .
                   1331:                      &Apache::lonnet::clutter($ENV{'request.course.uri'})};
                   1332:     return $self->getById($firstResource);
                   1333: }
                   1334: 
                   1335: # -------------------------------------------- Figure out a cascading parameter
                   1336: #
                   1337: # For this function to work
                   1338: #
                   1339: # * parmhash needs to be tied
                   1340: # * courseopt and useropt need to be initialized for this user and course
                   1341: #
                   1342: 
                   1343: sub parmval {
                   1344:     my $self = shift;
                   1345:     my ($what,$symb)=@_;
                   1346:     my $cid=$ENV{'request.course.id'};
                   1347:     my $csec=$ENV{'request.course.sec'};
                   1348:     my $uname=$ENV{'user.name'};
                   1349:     my $udom=$ENV{'user.domain'};
                   1350: 
                   1351:     unless ($symb) { return ''; }
                   1352:     my $result='';
                   1353: 
                   1354:     my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
                   1355: 
                   1356: # ----------------------------------------------------- Cascading lookup scheme
                   1357:     my $rwhat=$what;
                   1358:     $what=~s/^parameter\_//;
                   1359:     $what=~s/\_/\./;
                   1360: 
                   1361:     my $symbparm=$symb.'.'.$what;
                   1362:     my $mapparm=$mapname.'___(all).'.$what;
                   1363:     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
                   1364: 
                   1365:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   1366:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   1367:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   1368: 
                   1369:     my $courselevel= $usercourseprefix.'.'.$what;
                   1370:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   1371:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   1372: 
                   1373:     my $useropt = $self->{USER_OPT};
                   1374:     my $courseopt = $self->{COURSE_OPT};
                   1375:     my $parmhash = $self->{PARM_HASH};
                   1376: 
                   1377: # ---------------------------------------------------------- first, check user
                   1378:     if ($uname and defined($useropt)) {
                   1379:         if ($$useropt{$courselevelr}) { return $$useropt{$courselevelr}; }
                   1380:         if ($$useropt{$courselevelm}) { return $$useropt{$courselevelm}; }
                   1381:         if ($$useropt{$courselevel}) { return $$useropt{$courselevel}; }
                   1382:     }
                   1383: 
                   1384: # ------------------------------------------------------- second, check course
                   1385:     if ($csec and defined($courseopt)) {
                   1386:         if ($$courseopt{$seclevelr}) { return $$courseopt{$seclevelr}; }
                   1387:         if ($$courseopt{$seclevelm}) { return $$courseopt{$seclevelm}; }
                   1388:         if ($$courseopt{$seclevel}) { return $$courseopt{$seclevel}; }
                   1389:     }
                   1390: 
                   1391:     if (defined($courseopt)) {
                   1392:         if ($$courseopt{$courselevelr}) { return $$courseopt{$courselevelr}; }
                   1393:         if ($$courseopt{$courselevelm}) { return $$courseopt{$courselevelm}; }
                   1394:         if ($$courseopt{$courselevel}) { return $$courseopt{$courselevel}; }
                   1395:     }
                   1396: 
                   1397: # ----------------------------------------------------- third, check map parms
                   1398: 
                   1399:     my $thisparm=$$parmhash{$symbparm};
                   1400:     if ($thisparm) { return $thisparm; }
                   1401: 
                   1402: # ----------------------------------------------------- fourth , check default
                   1403: 
                   1404:     my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
                   1405:     if ($default) { return $default}
                   1406: 
                   1407: # --------------------------------------------------- fifth , cascade up parts
                   1408: 
                   1409:     my ($space,@qualifier)=split(/\./,$rwhat);
                   1410:     my $qualifier=join('.',@qualifier);
                   1411:     unless ($space eq '0') {
                   1412:         my ($part,$id)=split(/\_/,$space);
                   1413:         if ($id) {
                   1414:             my $partgeneral=$self->parmval($part.".$qualifier",$symb);
                   1415:             if ($partgeneral) { return $partgeneral; }
                   1416:         } else {
                   1417:             my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
                   1418:             if ($resourcegeneral) { return $resourcegeneral; }
                   1419:         }
                   1420:     }
                   1421:     return '';
                   1422: }
                   1423: 
                   1424: 
                   1425: 1;
                   1426: 
                   1427: package Apache::lonnavmaps::iterator;
                   1428: 
                   1429: # This package must precede "navmap" because "navmap" uses it. In
                   1430: # order to keep the documentation order straight, the iterator is documented
                   1431: # after the navmap object.
                   1432: 
                   1433: =pod
                   1434: 
                   1435: =back
                   1436: 
                   1437: =head1 navmap Iterator
                   1438: 
                   1439: An I<iterator> encapsulates the logic required to traverse a data structure. navmap uses an iterator to traverse the course map according to the criteria you wish to use.
                   1440: 
                   1441: To obtain an iterator, call the B<getIterator>() function of a B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator directly.) This will return a reference to the iterator:
                   1442: 
                   1443: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   1444: 
                   1445: To get the next thing from the iterator, call B<next>:
                   1446: 
                   1447: C<my $nextThing = $resourceIterator-E<gt>next()>
                   1448: 
                   1449: getIterator behaves as follows:
                   1450: 
                   1451: =over 4
                   1452: 
                   1453: =item B<getIterator>(nav_map, firstResource, finishResource, filterHash): 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(). It is your responsibility to ensure that the iterator will actually get there. 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 1, then only resource that exist IN the filterHash will be recursed on. If it is a 0, only resources NOT in the filterHash will be recursed on. Defaults to 0.
                   1454: 
                   1455: 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.
                   1456: 
                   1457: 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:
                   1458: 
                   1459: =over 4
                   1460: 
                   1461: =item * some list of tokens here
                   1462: 
                   1463: =back
                   1464: 
                   1465: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_NAV_MAP. (Perl will automatically optimize these into constants.
                   1466: 
                   1467: =cut
                   1468: 
                   1469: # Here are the tokens for the iterator:
                   1470: 
                   1471: sub END_NAV_MAP { return 0; }  # Represents end of entire nav map
                   1472: sub BEGIN_MAP { return 1; }    # begining of a new map
                   1473: sub END_MAP { return 2; }      # end of the map
                   1474: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   1475: sub END_BRANCH { return 4; }   # end of a branch
                   1476: 
                   1477: # Params: nav map, start resource, end resource, filter, condition, 
                   1478: # already seen hash ref
                   1479: 
                   1480: sub new {
                   1481:     # magic invocation to create a class instance
                   1482:     my $proto = shift;
                   1483:     my $class = ref($proto) || $proto;
                   1484:     my $self = {};
                   1485: 
                   1486:     $self->{NAV_MAP} = shift;
                   1487:     return undef unless ($self->{NAV_MAP});
                   1488: 
                   1489:     # Handle the parameters
                   1490:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   1491:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   1492: 
                   1493:     # If the given resources are just the ID of the resource, get the
                   1494:     # objects
                   1495:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   1496:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   1497:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   1498:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   1499: 
                   1500:     $self->{FILTER} = shift;
                   1501: 
                   1502:     # A hash, used as a set, of resource already seen
                   1503:     $self->{ALREADY_SEEN} = shift;
                   1504:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   1505: 
                   1506:     # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.
                   1507:     $self->{STARTED} = 0;
                   1508: 
                   1509:     # Should we continue calling the recursive iterator, if any?
                   1510:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   1511:     # The recursive iterator, if any
                   1512:     $self->{RECURSIVE_ITERATOR} = undef;
                   1513:     # Are we recursing on a map, or a branch?
                   1514:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   1515:     # And the count of how deep it is, so that this iterator can keep track of
                   1516:     # when to pick back up again.
                   1517:     $self->{RECURSIVE_DEPTH} = 0;
                   1518: 
                   1519:     # For keeping track of our branches, we maintain our own stack
                   1520:     $self->{BRANCH_STACK} = [];
                   1521:     # If the size shrinks, we exhausted a branch
                   1522:     $self->{BRANCH_STACK_SIZE} = 0;
                   1523:     $self->{BRANCH_DEPTH} = 0;
                   1524: 
                   1525:     # For returning two things in a forced sequence
                   1526:     $self->{FORCE_NEXT} = undef;
                   1527: 
                   1528:     # Start with the first resource
                   1529:     push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};
                   1530:     $self->{BRANCH_STACK_SIZE} = 1;
                   1531: 
                   1532:     bless($self);
                   1533:     return $self;
                   1534: }
                   1535: 
                   1536: # Note... this function is *touchy*. I strongly recommend tracing
                   1537: # through it with the debugger a few times on a non-trivial map before
                   1538: # modifying it. Order is *everything*.
                   1539: sub next {
                   1540:     my $self = shift;
                   1541:     
                   1542:     # Iterator logic goes here
                   1543: 
                   1544:     # Is this return value pre-determined?
                   1545:     if (defined($self->{FORCE_NEXT})) {
                   1546:         my $tmp = $self->{FORCE_NEXT};
                   1547:         $self->{FORCE_NEXT} = undef;
                   1548:         return $tmp;
                   1549:     }
                   1550: 
                   1551:     # Are we using a recursive iterator? If so, pull from that and
                   1552:     # watch the depth; we want to resume our level at the correct time.
                   1553:     if ($self->{RECURSIVE_ITERATOR_FLAG})
                   1554:     {
                   1555:         # grab the next from the recursive iterator
                   1556:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   1557:         
                   1558:         # is it a begin or end map? Update depth if so
                   1559:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   1560:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   1561: 
                   1562:         # Are we back at depth 0? If so, stop recursing.
                   1563:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   1564:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   1565:         }
                   1566:         
                   1567:         return $next;
                   1568:     }
                   1569: 
                   1570:     # Is there a current resource to grab? If not, then return
                   1571:     # END_BRANCH and END_MAP in succession.
                   1572:     if (scalar(@{$self->{BRANCH_STACK}}) == 0) {
                   1573:         if ($self->{BRANCH_DEPTH} > 0) {
                   1574:             $self->{FORCE_NEXT} = $self->END_MAP();
1.52      bowersj2 1575:             $self->{BRANCH_DEPTH}--;
1.51      bowersj2 1576:             return $self->END_BRANCH();
                   1577:         } else {
                   1578:             return $self->END_MAP();
                   1579:         }
                   1580:     }
                   1581: 
                   1582:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   1583:     # remember that we've started.
                   1584:     if ( !$self->{STARTED} ) {
                   1585:         $self->{STARTED} = 1;
                   1586:         return $self->BEGIN_MAP;
                   1587:     }
                   1588: 
                   1589:     # Did the branch stack shrink since last run? If so,
                   1590:     # we exhausted a branch last time, therefore, we're about
                   1591:     # to start a new one. (We know because we already checked to see
                   1592:     # if the stack was empty.)
                   1593:     if ( scalar (@{$self->{BRANCH_STACK}}) < $self->{BRANCH_STACK_SIZE}) {
1.52      bowersj2 1594:         $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});
                   1595:         $self->{BRANCH_DEPTH}++;
                   1596:         return $self->BEGIN_BRANCH();
1.51      bowersj2 1597:     }
                   1598: 
1.52      bowersj2 1599:     # Remember the size for comparision next time.
                   1600:     $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});
                   1601: 
                   1602:     # If the next resource we mean to return is going to need
                   1603:     # a lower branch level, terminate branches until we get 
                   1604:     # there.
                   1605: 
1.51      bowersj2 1606:     # Get the next resource in the branch
                   1607:     $self->{HERE} = pop @{$self->{BRANCH_STACK}};
1.52      bowersj2 1608: 
                   1609:     # Are we at the right depth? If not, close a branch and return
                   1610:     # the current resource onto the branch stack
                   1611:     if (defined($self->{HERE}->{DATA}->{ITERATOR_DEPTH})
                   1612:         && $self->{HERE}->{DATA}->{ITERATOR_DEPTH} <
                   1613:         $self->{BRANCH_DEPTH} ) {
                   1614:         $self->{BRANCH_DEPTH}--;
                   1615:         # return it so we can pick it up eventually
                   1616:         push @{$self->{BRANCH_STACK}}, $self->{HERE};
                   1617:         return $self->END_BRANCH();
                   1618:     }
                   1619: 
1.51      bowersj2 1620:     # We always return it after this point and never before
                   1621:     # (proof: look at just the return statements), so we
                   1622:     # remember that we've seen this.
                   1623:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   1624:     
                   1625:     # Are we at the utter end? If so, return the END_NAV_MAP marker.
                   1626:     if ($self->{HERE} == $self->{NAV_MAP}->finishResource() ) {
1.52      bowersj2 1627:         $self->{FORCE_NEXT} = $self->END_NAV_MAP;
1.51      bowersj2 1628:         return $self->{HERE};
                   1629:     }
                   1630:     
                   1631:     # Get the next possible resources
                   1632:     my $nextUnfiltered = $self->{HERE}->getNext();
                   1633:     my $next = [];
                   1634: 
                   1635:     # filter the next possibilities to remove things we've 
1.52      bowersj2 1636:     # already seen. Also, remember what branch depth they should
                   1637:     # be displayed at, since there's no other reliable way to tell.
1.51      bowersj2 1638:     foreach (@$nextUnfiltered) {
1.52      bowersj2 1639:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
                   1640:             push @$next, $_;
                   1641:             $_->{DATA}->{ITERATOR_DEPTH} = 
                   1642:                 $self->{BRANCH_DEPTH} + 1;
                   1643:         }
1.51      bowersj2 1644:     }
                   1645: 
                   1646:     # Handle branch cases:
                   1647:     # Nothing is available next: BRANCH_END
                   1648:     # 1 thing next: standard non-branch
                   1649:     # 2+ things next: have some branches
                   1650:     my $nextCount = scalar(@$next);
                   1651:     if ($nextCount == 0) {
1.52      bowersj2 1652:         # Return this and on the next run, close the branch up if we're 
                   1653:         # in a branch
                   1654:         if ($self->{BRANCH_DEPTH} > 0 ) {
                   1655:             $self->{FORCE_NEXT} = $self->END_BRANCH();
                   1656:             $self->{BRANCH_DEPTH}--;
                   1657:         }
1.51      bowersj2 1658:         return $self->{HERE};
                   1659:     }
                   1660:     
                   1661:     while (@$next) {
                   1662:         # copy the next possibilities over to the branch stack
                   1663:         # in the right order
1.52      bowersj2 1664:         push @{$self->{BRANCH_STACK}}, shift @$next;
1.51      bowersj2 1665:     }
                   1666: 
                   1667:     if ($nextCount >= 2) {
1.52      bowersj2 1668:         $self->{FORCE_NEXT} = $self->BEGIN_BRANCH();
                   1669:         $self->{BRANCH_DEPTH}++;
1.51      bowersj2 1670:         return $self->{HERE}; 
                   1671:     }
                   1672: 
                   1673:     # If this is a map and we want to recurse down it... (not filtered out)
                   1674:     if ($self->{HERE}->is_map() && 
                   1675:          !defined($self->{FILTER}->{$self->{HERE}->map_pc()})) { 
                   1676:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   1677:         my $firstResource = $self->{HERE}->map_start();
                   1678:         my $finishResource = $self->{HERE}->map_finish();
                   1679: 
                   1680:         # Odd perl syntax here; $self->new allows one to create a new iterator
                   1681:         # can't figure out how to ref this package directly correctly
                   1682:         # isn't MAIN::new, __PACKAGE__::new or Apache::lonnavmaps::iterator->new
                   1683:         $self->{RECURSIVE_ITERATOR} =
                   1684:           Apache::lonnavmaps::iterator->new ($self->{NAV_MAP}, $firstResource, 
                   1685:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN});
1.52      bowersj2 1686:         # prime the new iterator with the first resource
                   1687:         #push @{$self->{RECURSIVE_ITERATOR}->{BRANCH_STACK}}, $firstResource;
1.51      bowersj2 1688:     }
                   1689: 
                   1690:     return $self->{HERE};
                   1691: }
                   1692: 
                   1693: =pod
                   1694: 
                   1695: 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).
                   1696: 
                   1697: =cut
                   1698: 
                   1699: sub getStack {
                   1700:     my $self=shift;
                   1701: 
                   1702:     my @stack;
                   1703: 
                   1704:     $self->populateStack(\@stack);
                   1705: 
                   1706:     return \@stack;
                   1707: }
                   1708: 
                   1709: # Private method: Calls the iterators recursively to populate the stack.
                   1710: sub populateStack {
                   1711:     my $self=shift;
                   1712:     my $stack = shift;
                   1713: 
                   1714:     push @$stack, $self->{HERE};
                   1715: 
                   1716:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   1717:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   1718:     }
                   1719: }
                   1720: 
1.1       www      1721: 1;
1.2       www      1722: 
1.51      bowersj2 1723: package Apache::lonnavmaps::resource;
                   1724: 
                   1725: use Apache::lonnet;
                   1726: 
                   1727: =pod
                   1728: 
                   1729: =head1 Object: resource
                   1730: 
                   1731: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
                   1732: 
                   1733: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
                   1734: 
                   1735: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
                   1736: 
                   1737: =head2 Public Members
                   1738: 
                   1739: resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash.
                   1740: 
                   1741: =head2 Methods
                   1742: 
                   1743: =over 4
                   1744: 
                   1745: =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. 
                   1746: 
                   1747: =cut
                   1748: 
                   1749: sub new {
                   1750:     # magic invocation to create a class instance
                   1751:     my $proto = shift;
                   1752:     my $class = ref($proto) || $proto;
                   1753:     my $self = {};
                   1754: 
                   1755:     $self->{NAV_MAP} = shift;
                   1756:     $self->{ID} = shift;
                   1757: 
                   1758:     # Store this new resource in the parent nav map's cache.
                   1759:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
                   1760: 
                   1761:     # A hash that can be used by two-pass algorithms to store data
                   1762:     # about this resource in. Not used by the resource object
                   1763:     # directly.
                   1764:     $self->{DATA} = {};
                   1765:    
                   1766:     bless($self);
                   1767:     
                   1768:     return $self;
                   1769: }
                   1770: 
                   1771: =pod
                   1772: 
                   1773: =item * B<is_map>: Returns true if this is a map, false otherwise.
                   1774: 
                   1775: =item * B<title>: Returns title.
                   1776: 
                   1777: =item * B<type>: Returns the type of the resource, "start", "normal", or "finish". 
                   1778: 
                   1779: =item * B<problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field.)
                   1780: 
                   1781: =back
                   1782: 
                   1783: =cut
                   1784: 
                   1785: # private function: simplify the NAV_HASH lookups we keep doing
                   1786: # pass the name, and to automatically append my ID, pass a true val on the
                   1787: # second param
                   1788: sub navHash {
                   1789:     my $self = shift;
                   1790:     my $param = shift;
                   1791:     my $id = shift;
                   1792:     return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")};
                   1793: }
                   1794: 
                   1795: # These info functions can be used directly, as they don't return
                   1796: # resource information.
                   1797: sub title { my $self=shift; return $self->navHash("title_", 1); }
                   1798: sub type { my $self=shift; return $self->navHash("type_", 1); }
                   1799: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   1800: # "to" can return a comma seperated list for branches
                   1801: sub to { my $self=shift; return $self->navHash("to_", 1); }
                   1802: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
                   1803: sub src { 
                   1804:     my $self=shift;
                   1805:     return $self->navHash("src_", 1);
                   1806: }
                   1807: sub symb {
                   1808:     my $self=shift;
                   1809:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   1810:     my $symbSrc = &Apache::lonnet::declutter($self->src());
                   1811:     return &Apache::lonnet::declutter(
                   1812:          $self->navHash('map_id_'.$first)) 
                   1813:         . '___' . $second . '___' . $symbSrc;
                   1814: }
                   1815: sub is_problem {
                   1816:     my $self=shift;
                   1817:     my $src = $self->src();
                   1818:     return ($src =~ /problem$/);
                   1819: }
                   1820: sub is_html {
                   1821:     my $self=shift;
                   1822:     my $src = $self->src();
                   1823:     return ($src =~ /html$/);
                   1824: }
                   1825: sub is_sequence {
                   1826:     my $self=shift;
                   1827:     my $src = $self->src();
                   1828:     return ($src =~ /sequence$/);
                   1829: }
                   1830: sub is_page {
                   1831:     my $self=shift;
                   1832:     my $src = $self->src();
                   1833:     return ($src =~ /page$/);
                   1834: }
                   1835: 
                   1836: 
                   1837: 
                   1838: 
                   1839: # Move this into POD: In order to use these correctly, courseopt
                   1840: # and useropt need to be generated
                   1841: sub parmval {
                   1842:     my $self = shift;
                   1843:     my $what = shift;
                   1844:     my $part = shift || "0";
                   1845:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   1846: }
                   1847: 
                   1848: #####
                   1849: # Map Queries
                   1850: #####
                   1851: 
                   1852: # These methods relate to whether or not the resource is a map, and the 
                   1853: # attributes of that map.
                   1854: 
                   1855: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   1856: sub map_finish {
                   1857:     my $self = shift;
                   1858:     my $src = $self->src();
                   1859:     my $res = $self->navHash("map_finish_$src", 0);
                   1860:     $res = $self->{NAV_MAP}->getById($res);
                   1861:     return $res;
                   1862: }
                   1863: sub map_start {
                   1864:     my $self = shift;
                   1865:     my $src = $self->src();
                   1866:     my $res = $self->navHash("map_start_$src", 0);
                   1867:     $res = $self->{NAV_MAP}->getById($res);
                   1868:     return $res;
                   1869: }
                   1870: sub map_pc {
                   1871:     my $self = shift;
                   1872:     my $src = $self->src();
                   1873:     return $self->navHash("map_pc_$src", 0);
                   1874: }
                   1875: sub map_type {
                   1876:     my $self = shift;
                   1877:     my $pc = $self->map_pc();
                   1878:     return $self->navHash("map_type_$pc", 0);
                   1879: }
                   1880: 
                   1881: 
                   1882: 
                   1883: #####
                   1884: # Property queries
                   1885: #####
                   1886: 
                   1887: # These functions will be responsible for returning the CORRECT
                   1888: # VALUE for the parameter, no matter what. So while they may look
                   1889: # like direct calls to parmval, they can be more then that.
                   1890: # So, for instance, the duedate function should use the "duedatetype"
                   1891: # information, rather then the resource object user.
                   1892: 
                   1893: =pod
                   1894: 
                   1895: =head2 Resource Parameters
                   1896: 
                   1897: In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to "part 0", but can be directed to another part by passing the part as the second parameter.
                   1898: 
                   1899: These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)
                   1900: 
                   1901: =over 4
                   1902: 
                   1903: =item * B<acc>: Get the Client IP/Name Access Control information.
                   1904: 
                   1905: =item * B<answerdate>: Get the answer-reveal date for the problem.
                   1906: 
                   1907: =item * B<duedate>: Get the due date for the problem.
                   1908: 
                   1909: =item * B<tries>: Get the number of tries the student has used on the problem.
                   1910: 
                   1911: =item * B<maxtries>: Get the number of max tries allowed.
                   1912: 
                   1913: =item * B<opendate>: Get the open date for the problem.
                   1914: 
                   1915: =item * B<sig>: Get the significant figures setting.
                   1916: 
                   1917: =item * B<tol>: Get the tolerance for the problem.
                   1918: 
                   1919: =item * B<type>: Get the question type for the problem.
                   1920: 
                   1921: =item * B<weight>: Get the weight for the problem.
                   1922: 
                   1923: =back
                   1924: 
                   1925: =cut
                   1926: 
                   1927: sub acc {
                   1928:     (my $self, my $part) = @_;
                   1929:     return $self->parmval("acc", $part);
                   1930: }
                   1931: sub answerdate {
                   1932:     (my $self, my $part) = @_;
                   1933:     # Handle intervals
                   1934:     if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
                   1935:         return $self->duedate($part) + 
                   1936:             $self->parmval("answerdate", $part);
                   1937:     }
                   1938:     return $self->parmval("answerdate", $part);
                   1939: }
                   1940: sub duedate {
                   1941:     (my $self, my $part) = @_;
                   1942:     return $self->parmval("duedate", $part);
                   1943: }
                   1944: sub maxtries {
                   1945:     (my $self, my $part) = @_;
                   1946:     return $self->parmval("maxtries", $part);
                   1947: }
                   1948: sub opendate {
                   1949:     (my $self, my $part) = @_;
                   1950:     if ($self->parmval("opendate.type", $part) eq 'date_interval') {
                   1951:         return $self->duedate($part) -
                   1952:             $self->parmval("opendate", $part);
                   1953:     }
                   1954:     return $self->parmval("opendate");
                   1955: }
                   1956: sub sig {
                   1957:     (my $self, my $part) = @_;
                   1958:     return $self->parmval("sig", $part);
                   1959: }
                   1960: sub tol {
                   1961:     (my $self, my $part) = @_;
                   1962:     return $self->parmval("tol", $part);
                   1963: }
                   1964: sub type {
                   1965:     (my $self, my $part) = @_;
                   1966:     return $self->parmval("type", $part);
                   1967: }
                   1968: sub weight {
                   1969:     (my $self, my $part) = @_;
                   1970:     return $self->parmval("weight", $part);
                   1971: }
                   1972: sub tries {
                   1973:     my $self = shift;
                   1974:     my $part = shift;
                   1975:     $part = '0' if (!defined($part));
                   1976: 
                   1977:     # Make sure return hash is loaded, should error check
                   1978:     $self->getReturnHash();
                   1979:     
                   1980:     my $tries = $self->{RETURN_HASH}->{'resource.'.$part.'.tries'};
                   1981:     if (!defined($tries)) {return '0';}
                   1982:     return $tries;
                   1983: }
                   1984: 
                   1985: # Multiple things need this
                   1986: sub getReturnHash {
                   1987:     my $self = shift;
                   1988:     
                   1989:     if (!defined($self->{RETURN_HASH})) {
                   1990:         my %tmpHash = &Apache::lonnet::restore($self->symb());
                   1991:         $self->{RETURN_HASH} = \%tmpHash;
                   1992:     }
                   1993: }       
                   1994: 
                   1995: ######
                   1996: # Status queries
                   1997: ######
                   1998: 
                   1999: # These methods query the status of problems.
                   2000: 
                   2001: # If we need to count parts, this function determines the number of
                   2002: # parts from the metadata. When called, it returns a reference to a list
                   2003: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   2004: # tells you how many parts you have in the problem:
                   2005: # $partcount = scalar($resource->countParts());
                   2006: # Don't use $self->{PARTS} directly because you don't know if it's been
                   2007: # computed yet.
                   2008: 
                   2009: =pod
                   2010: 
                   2011: =head2 Resource misc
                   2012: 
                   2013: Misc. functions for the resource.
                   2014: 
                   2015: =over 4
                   2016: 
                   2017: =item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater then two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. You may or may not wish to filter out part 0.)
                   2018: 
                   2019: =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0.
                   2020: 
                   2021: =back
                   2022: 
                   2023: =cut
                   2024: 
                   2025: sub parts {
                   2026:     my $self = shift;
                   2027: 
                   2028:     $self->extractParts();
                   2029:     return $self->{PARTS};
                   2030: }
                   2031: 
                   2032: sub countParts {
                   2033:     my $self = shift;
                   2034:     
                   2035:     my $parts = $self->parts();
                   2036:     
                   2037:     if (scalar(@{$parts}) == 1) { return 1;}
                   2038: 
                   2039:     return scalar(@{$parts}) - 1;
                   2040: }
                   2041: 
                   2042: # Private function: Extracts the parts information and saves it
                   2043: sub extractParts { 
                   2044:     my $self = shift;
                   2045:     
                   2046:     return if ($self->{PARTS});
                   2047: 
                   2048:     $self->{PARTS} = [];
                   2049: 
                   2050:     # Retrieve part count
                   2051:     foreach (split(/\,/,&Apache::lonnet::metadata($self->src(), 
                   2052:                                                   'allpossiblekeys'))) {
                   2053:         if ($_ =~ /^parameter\_(.*)\_opendate$/) {
                   2054:             push @{$self->{PARTS}}, $1;
                   2055:         }
                   2056:     }
                   2057:     
                   2058:     # Is this possible to do in one line? - Jeremy
                   2059:     my @sortedParts = sort @{$self->{PARTS}};
                   2060:     $self->{PARTS} = \@sortedParts;
                   2061: 
                   2062:     return;
                   2063: }
                   2064: 
                   2065: =pod
                   2066: 
                   2067: =head2 Resource Status
                   2068: 
                   2069: Problem resources have status information, reflecting their various dates and completion statuses. You can obtain this information and import symbolic constants to represent the status.
                   2070: 
                   2071: There are two aspects to the status: the date-related information and the completion information.
                   2072: 
                   2073: Idiomatic usage of these two methods would probably look something like
                   2074: 
                   2075:  foreach ($resource->parts()) {
                   2076:     my $dateStatus = $resource->getDateStatus($_);
                   2077:     my $completionStatus = $resource->getCompletionStatus($_);
                   2078: 
                   2079:     ... use it here ...
                   2080:  }
                   2081: 
                   2082: =over 4
                   2083: 
                   2084: =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, with the following possible results:
                   2085: 
                   2086: =back
                   2087: 
                   2088: B<Date Codes>
                   2089: 
                   2090: =over 4
                   2091: 
                   2092: =item * B<OPEN_LATER>: The problem will be opened later.
                   2093: 
                   2094: =item * B<OPEN>: Open and not yet due.
                   2095: 
1.54      bowersj2 2096: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
                   2097: 
                   2098: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51      bowersj2 2099: 
                   2100: =item * B<ANSWER_OPEN>: The answer date is here.
                   2101: 
                   2102: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
                   2103: 
                   2104: =back
                   2105: 
                   2106: =cut
                   2107: 
                   2108: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 2109: sub OPEN_LATER             { return 0; }
                   2110: sub OPEN                   { return 1; }
                   2111: sub PAST_DUE_NO_ANSWER     { return 2; }
                   2112: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   2113: sub ANSWER_OPEN            { return 4; }
                   2114: sub NOTHING_SET            { return 5; } 
                   2115: sub NETWORK_FAILURE        { return 100; }
                   2116: 
                   2117: # getDateStatus gets the date status for a given problem part. 
                   2118: # Because answer date, due date, and open date are fully independent
                   2119: # (i.e., it is perfectly possible to *only* have an answer date), 
                   2120: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   2121: # (past, future, none given). This function handles this with a decision
                   2122: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 2123: 
                   2124: sub getDateStatus {
                   2125:     my $self = shift;
                   2126:     my $part = shift;
                   2127:     $part = "0" if (!defined($part));
1.54      bowersj2 2128: 
                   2129:     # Always return network failure if there was one.
1.51      bowersj2 2130:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   2131: 
                   2132:     my $now = time();
                   2133: 
1.53      bowersj2 2134:     my $open = $self->opendate($part);
                   2135:     my $due = $self->duedate($part);
                   2136:     my $answer = $self->answerdate($part);
                   2137: 
                   2138:     if (!$open && !$due && !$answer) {
                   2139:         # no data on the problem at all
                   2140:         # should this be the same as "open later"? think multipart.
                   2141:         return $self->NOTHING_SET;
                   2142:     }
1.54      bowersj2 2143:     if (!$open || $now < $open) {return $self->OPEN_LATER};
                   2144:     if (!$due || $now < $due) {return $self->OPEN};
                   2145:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER};
                   2146:     if ($answer) { return $self->ANSWER_OPEN; };
                   2147:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 2148: }
                   2149: 
                   2150: =pod
                   2151: 
                   2152: B<>
                   2153: 
                   2154: =over 4
                   2155: 
                   2156: =item * B<getCompletionStatus>($part): ($part defaults to 0.) A convenience function that returns a symbolic constant telling you about the completion status of the part, with the following possible results:
                   2157: 
                   2158: =back 
                   2159: 
                   2160: B<Completion Codes>
                   2161: 
                   2162: =over 4
                   2163: 
                   2164: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
                   2165: 
                   2166: =item * B<INCORRECT>: Attempted, but wrong by student.
                   2167: 
                   2168: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
                   2169: 
                   2170: =item * B<CORRECT>: Correct or correct by instructor.
                   2171: 
                   2172: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
                   2173: 
                   2174: =item * B<EXCUSED>: Excused. Not yet implemented.
                   2175: 
                   2176: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
                   2177: 
                   2178: =back
                   2179: 
                   2180: =cut
                   2181: 
1.53      bowersj2 2182: sub NOT_ATTEMPTED         { return 10; }
                   2183: sub INCORRECT             { return 11; }
                   2184: sub INCORRECT_BY_OVERRIDE { return 12; }
                   2185: sub CORRECT               { return 13; }
                   2186: sub CORRECT_BY_OVERRIDE   { return 14; }
                   2187: sub EXCUSED               { return 15; }
1.51      bowersj2 2188: 
                   2189: sub getCompletionStatus {
                   2190:     my $self = shift;
                   2191:     my $part = shift;
                   2192:     $part = "0" if (!defined($part));
                   2193:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   2194: 
                   2195:     # Make sure return hash exists
                   2196:     $self->getReturnHash();
                   2197:     
                   2198:     my $status = $self->{RETURN_HASH}->{'resource.'.$part.'.solved'};
                   2199: 
                   2200:     # Left as seperate if statements in case we ever do more with this
                   2201:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
                   2202:     if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
                   2203:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   2204:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   2205:     if ($status eq 'excused') {return $self->EXCUSED; }
                   2206:     return $self->NOT_ATTEMPTED;
                   2207: }
                   2208: 
                   2209: =pod
                   2210: 
                   2211: B<Composite Status>
                   2212: 
                   2213: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE()):
                   2214: 
                   2215: =over 4
                   2216: 
                   2217: =item * NETWORK_FAILURE: The network has failed and the information is not available.
                   2218: 
1.53      bowersj2 2219: =item * NOTHING_SET: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened.)
                   2220: 
1.51      bowersj2 2221: =item * CORRECT: For any reason at all, the part is considered correct.
                   2222: 
                   2223: =item * EXCUSED: For any reason at all, the problem is excused.
                   2224: 
1.54      bowersj2 2225: =item * PAST_DUE_NO_ANSWER: The problem is past due, not considered correct, and no answer date is set.
                   2226: 
                   2227: =item * PAST_DUE_ANSWER_LATER: The problem is past due, not considered correct, and an answer date in the future is set.
1.51      bowersj2 2228: 
                   2229: =item * ANSWER_OPEN: The problem is past due, not correct, and the answer is now available.
                   2230: 
                   2231: =item * OPEN_LATER: The problem is not yet open.
                   2232: 
                   2233: =item * TRIES_LEFT: The problem is open, has been tried, is not correct, but there are tries left.
                   2234: 
                   2235: =item * INCORRECT: The problem is open, and all tries have been used without getting the correct answer.
                   2236: 
                   2237: =item * OPEN: The item is open and not yet tried.
                   2238: 
                   2239: =back
                   2240: 
                   2241: =cut
                   2242: 
                   2243: sub TRIES_LEFT { return 10; }
                   2244: 
                   2245: sub status {
                   2246:     my $self = shift;
                   2247:     my $part = shift;
                   2248:     if (!defined($part)) { $part = "0"; }
                   2249:     my $completionStatus = $self->getCompletionStatus($part);
                   2250:     my $dateStatus = $self->getDateStatus($part);
                   2251: 
                   2252:     # What we have is a two-dimensional matrix with 4 entries on one
                   2253:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 2254:     # plus network failure and "no date data at all".
1.51      bowersj2 2255: 
1.53      bowersj2 2256:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 2257: 
                   2258:     # There are a few whole rows we can dispose of:
1.53      bowersj2 2259:     if ($completionStatus == CORRECT ||
                   2260:         $completionStatus == CORRECT_BY_OVERRIDE ) {
                   2261:         return CORRECT(); 
                   2262:     }
                   2263: 
                   2264:     # If it's EXCUSED, then return that no matter what
                   2265:     if ($completionStatus == EXCUSED) {
                   2266:         return EXCUSED; 
1.51      bowersj2 2267:     }
                   2268: 
1.53      bowersj2 2269:     if ($dateStatus == NOTHING_SET) {
                   2270:         return NOTHING_SET;
1.51      bowersj2 2271:     }
                   2272: 
                   2273:     # Now we're down to a 3 (incorrect, incorrect_override, not_attempted)
                   2274:     # by 4 matrix (date status).
                   2275: 
1.54      bowersj2 2276:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
                   2277:         $dateStatus == PAST_DUE_NO_ANSWER) {
                   2278:         return $dateStatus; 
1.51      bowersj2 2279:     }
                   2280: 
1.53      bowersj2 2281:     if ($dateStatus == ANSWER_OPEN) {
                   2282:         return ANSWER_OPEN;
1.51      bowersj2 2283:     }
                   2284: 
                   2285:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   2286:     # (open_later), (open)
                   2287:     
1.53      bowersj2 2288:     if ($dateStatus == OPEN_LATER) {
                   2289:         return OPEN_LATER;
1.51      bowersj2 2290:     }
                   2291: 
                   2292:     # If it's WRONG...
1.53      bowersj2 2293:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 2294:         # and there are TRIES LEFT:
                   2295:         if ($self->tries() < $self->maxtries()) {
1.53      bowersj2 2296:             return TRIES_LEFT;
1.51      bowersj2 2297:         }
1.53      bowersj2 2298:         return INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 2299:     }
                   2300: 
                   2301:     # Otherwise, it's untried and open
1.53      bowersj2 2302:     return OPEN; 
1.51      bowersj2 2303: }
                   2304: 
                   2305: =pod
                   2306: 
                   2307: =head2 Resource/Nav Map Navigation
                   2308: 
                   2309: =over 4
                   2310: 
                   2311: =item * B<getNext>(): Gets the next resource in the navmap after this one.
                   2312: 
                   2313: =cut
                   2314: 
                   2315: # For the simple single-link case, to get from a resource to the next
                   2316: # resource, you need to look up the "to_" link in the nav hash, then
                   2317: # follow that with the "goesto_" link.
                   2318: 
                   2319: sub getNext {
                   2320:     my $self = shift;
                   2321:     my $alreadySeenHash = shift;
                   2322:     my @branches;
                   2323:     my $to = $self->to();
                   2324:     foreach my $branch ( split(/\,/, $to) ) {
                   2325:         my $choice = $self->{NAV_MAP}->getById($branch);
                   2326:         my $next = $choice->goesto();
                   2327:         $next = $self->{NAV_MAP}->getById($next);
                   2328: 
                   2329:         # Don't remember it if we've already seen it
                   2330:         if (!defined($alreadySeenHash) ||
                   2331:             !defined($alreadySeenHash->{$next->{ID}})) {
                   2332:                 push @branches, $next;
                   2333:             }
                   2334:     }
                   2335:     return \@branches;
                   2336: }
                   2337: 
                   2338: =pod
1.2       www      2339: 
1.51      bowersj2 2340: =back
1.2       www      2341: 
1.51      bowersj2 2342: =cut
1.2       www      2343: 
1.51      bowersj2 2344: 1;
1.2       www      2345: 
1.51      bowersj2 2346: __END__
1.2       www      2347: 
                   2348: 

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