Annotation of loncom/interface/lonnavmaps.pm, revision 1.297

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.297   ! albertel    4: # $Id: lonnavmaps.pm,v 1.296 2004/09/21 20:33:49 albertel 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: #
1.245     www        28: ###
1.2       www        29: 
1.1       www        30: package Apache::lonnavmaps;
                     31: 
                     32: use strict;
1.2       www        33: use Apache::Constants qw(:common :http);
1.18      albertel   34: use Apache::loncommon();
1.150     www        35: use Apache::lonmenu();
1.229     www        36: use Apache::lonlocal;
1.73      bowersj2   37: use POSIX qw (floor strftime);
1.192     bowersj2   38: use Data::Dumper; # for debugging, not always used
1.2       www        39: 
1.133     bowersj2   40: # symbolic constants
                     41: sub SYMB { return 1; }
                     42: sub URL { return 2; }
                     43: sub NOTHING { return 3; }
                     44: 
                     45: # Some data
                     46: 
1.140     bowersj2   47: my $resObj = "Apache::lonnavmaps::resource";
                     48: 
1.135     bowersj2   49: # Keep these mappings in sync with lonquickgrades, which uses the colors
                     50: # instead of the icons.
                     51: my %statusIconMap = 
1.224     bowersj2   52:     (
                     53:      $resObj->CLOSED       => '',
                     54:      $resObj->OPEN         => 'navmap.open.gif',
                     55:      $resObj->CORRECT      => 'navmap.correct.gif',
                     56:      $resObj->INCORRECT    => 'navmap.wrong.gif',
                     57:      $resObj->ATTEMPTED    => 'navmap.ellipsis.gif',
                     58:      $resObj->ERROR        => ''
                     59:      );
1.135     bowersj2   60: 
                     61: my %iconAltTags = 
                     62:     ( 'navmap.correct.gif' => 'Correct',
                     63:       'navmap.wrong.gif'   => 'Incorrect',
                     64:       'navmap.open.gif'    => 'Open' );
1.133     bowersj2   65: 
1.136     bowersj2   66: # Defines a status->color mapping, null string means don't color
                     67: my %colormap = 
1.140     bowersj2   68:     ( $resObj->NETWORK_FAILURE        => '',
                     69:       $resObj->CORRECT                => '',
                     70:       $resObj->EXCUSED                => '#3333FF',
                     71:       $resObj->PAST_DUE_ANSWER_LATER  => '',
                     72:       $resObj->PAST_DUE_NO_ANSWER     => '',
                     73:       $resObj->ANSWER_OPEN            => '#006600',
                     74:       $resObj->OPEN_LATER             => '',
                     75:       $resObj->TRIES_LEFT             => '',
                     76:       $resObj->INCORRECT              => '',
                     77:       $resObj->OPEN                   => '',
1.207     bowersj2   78:       $resObj->NOTHING_SET            => '',
                     79:       $resObj->ATTEMPTED              => '',
                     80:       $resObj->ANSWER_SUBMITTED       => ''
                     81:       );
1.136     bowersj2   82: # And a special case in the nav map; what to do when the assignment
                     83: # is not yet done and due in less then 24 hours
                     84: my $hurryUpColor = "#FF0000";
1.130     www        85: 
1.268     albertel   86: sub launch_win {
1.281     albertel   87:     my ($mode,$script,$toplinkitems)=@_;
1.268     albertel   88:     my $result;
                     89:     if ($script ne 'no') {
                     90: 	$result.='<script type="text/javascript">';
                     91:     }
                     92:     $result.='function launch_navmapwin() {
                     93:                  newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
                     94:                }';
                     95:     if ($mode eq 'now') {
                     96: 	$result.="\nlaunch_navmapwin();\n";
                     97:     }
                     98:     if ($script ne 'no') {
                     99: 	$result.='</script>';
                    100:     }
                    101:     if ($mode eq 'link') {
1.281     albertel  102: 	&add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
                    103: 		      "Launch navigation window");
1.268     albertel  104:     }
                    105:     return $result;
                    106: }
                    107: 
1.269     albertel  108: sub close {
                    109:     if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
                    110:     return(<<ENDCLOSE);
                    111: <script type="text/javascript">
                    112: window.status='Accessing Nav Control';
                    113: menu=window.open("/adm/rat/empty.html","loncapanav",
                    114:                  "height=600,width=400,scrollbars=1");
                    115: window.status='Closing Nav Control';
                    116: menu.close();
                    117: window.status='Done.';
                    118: </script>
                    119: ENDCLOSE
                    120: }
1.268     albertel  121: 
1.278     albertel  122: sub nav_control_js {
                    123:     my $nav=($ENV{'environment.remotenavmap'} eq 'on');
                    124:     return (<<NAVCONTROL);
                    125:     var w_loncapanav_flag="$nav";
                    126: 
                    127: 
                    128: function gonav(url) {
                    129:    if (w_loncapanav_flag != 1) {
1.292     albertel  130:       gopost(url,'');
1.278     albertel  131:    }  else {
                    132:       navwindow=window.open(url,
                    133:                   "loncapanav","height=600,width=400,scrollbars=1"); 
                    134:    }
                    135: }
                    136: NAVCONTROL
                    137: }
                    138: 
1.270     albertel  139: sub update {
                    140:     if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
                    141:     if (!$ENV{'request.course.id'}) { return ''; }
                    142:     if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
                    143:     return(<<ENDUPDATE);
                    144: <form name="navform"></form>
                    145: <script type="text/javascript">
                    146: this.document.navform.action='/adm/navmaps#curloc';
                    147: this.document.navform.target='loncapanav';
                    148: this.document.navform.submit();
                    149: </script>
                    150: ENDUPDATE
                    151: }
1.268     albertel  152: 
1.1       www       153: sub handler {
1.99      bowersj2  154:     my $r = shift;
1.118     bowersj2  155:     real_handler($r);
                    156: }
                    157: 
                    158: sub real_handler {
                    159:     my $r = shift;
1.2       www       160: 
1.51      bowersj2  161:     # Handle header-only request
                    162:     if ($r->header_only) {
                    163:         if ($ENV{'browser.mathml'}) {
1.232     www       164:             &Apache::loncommon::content_type($r,'text/xml');
1.51      bowersj2  165:         } else {
1.232     www       166:             &Apache::loncommon::content_type($r,'text/html');
1.51      bowersj2  167:         }
                    168:         $r->send_http_header;
                    169:         return OK;
                    170:     }
                    171: 
                    172:     # Send header, don't cache this page
                    173:     if ($ENV{'browser.mathml'}) {
1.232     www       174:         &Apache::loncommon::content_type($r,'text/xml');
1.51      bowersj2  175:     } else {
1.232     www       176:         &Apache::loncommon::content_type($r,'text/html');
1.51      bowersj2  177:     }
                    178:     &Apache::loncommon::no_cache($r);
                    179:     $r->send_http_header;
                    180: 
1.281     albertel  181:     my %toplinkitems=();
                    182: 
1.268     albertel  183:     if ($ENV{QUERY_STRING} eq 'collapseExternal') {
                    184: 	&Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
                    185: 	&Apache::lonnet::appenv('environment.remotenavmap' => 'off');
1.275     albertel  186: 	my $menu=&Apache::lonmenu::reopenmenu();
                    187: 	my $navstatus=&Apache::lonmenu::get_nav_status();
                    188: 	if ($menu) {
                    189: 	    $menu=(<<MENU)
                    190:              swmenu=$menu
                    191:              swmenu.clearTimeout(swmenu.menucltim);
                    192: 	     $navstatus
                    193: MENU
1.280     albertel  194:         } else {
                    195: 	    my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
                    196: 	    my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
                    197: 	    $menu=(<<MENU)
                    198:              swmenu=$mainwindow
                    199: 	     $navstatus
                    200: MENU
1.275     albertel  201: 	}
1.268     albertel  202: 	$r->print(<<"ENDSUBM");
                    203: 	<html>
                    204:         <head>
                    205: 	  <script type="text/javascript">
                    206:  	    function submitthis() {
1.275     albertel  207: 		    $menu
1.268     albertel  208: 		    self.close();
                    209: 	    }
1.275     albertel  210: 	
1.268     albertel  211:   	  </script>
                    212:         </head>
                    213: 	<body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
                    214:         </html>
                    215: ENDSUBM
                    216:         return;
                    217:     }
                    218:     if ($ENV{QUERY_STRING} eq 'launchExternal') {
                    219: 	&Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
                    220: 	&Apache::lonnet::appenv('environment.remotenavmap' => 'on');
                    221:     }
                    222: 
1.106     bowersj2  223:     # Create the nav map
1.221     bowersj2  224:     my $navmap = Apache::lonnavmaps::navmap->new();
1.51      bowersj2  225: 
1.55      bowersj2  226:     if (!defined($navmap)) {
                    227:         my $requrl = $r->uri;
                    228:         $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
                    229:         return HTTP_NOT_ACCEPTABLE;
                    230:     }
1.64      bowersj2  231: 
1.111     bowersj2  232:     $r->print("<html><head>\n");
1.229     www       233:     $r->print("<title>".&mt('Navigate Course Contents')."</title>");
1.150     www       234: # ------------------------------------------------------------ Get query string
1.276     albertel  235:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework']);
1.158     bowersj2  236:     
1.150     www       237: # ----------------------------------------------------- Force menu registration
                    238:     my $addentries='';
1.268     albertel  239:     my $more_unload;
1.278     albertel  240:     my $body_only='';
1.268     albertel  241:     if ($ENV{'environment.remotenavmap'} eq 'on') {
                    242: 	$r->print('<script type="text/javascript">
                    243:                       function collapse() {
                    244:                          this.document.location="/adm/navmaps?collapseExternal";
                    245:                       }
                    246:                    </script>');
                    247: # FIXME need to be smarter to only catch window close events
                    248: #	$more_unload="collapse()"
1.278     albertel  249: 	$body_only=1;
1.268     albertel  250:     }
1.150     www       251:     if ($ENV{'form.register'}) {
1.268     albertel  252: 	$addentries=' onLoad="'.&Apache::lonmenu::loadevents().
                    253: 	    '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
                    254: 	    $more_unload.'"';
                    255: 	$r->print(&Apache::lonmenu::registerurl(1));
                    256:     } else {
                    257: 	$addentries=' onUnload="'.$more_unload.'"';
1.150     www       258:     }
1.111     bowersj2  259: 
1.64      bowersj2  260:     # Header
1.150     www       261:     $r->print('</head>'.
                    262:               &Apache::loncommon::bodytag('Navigate Course Contents','',
1.278     albertel  263: 					  $addentries,$body_only,'',
                    264: 					  $ENV{'form.register'}));
1.283     raeburn   265:     $r->print('<script>window.focus();</script>');
1.265     albertel  266:      
1.124     bowersj2  267:     $r->rflush();
                    268: 
1.55      bowersj2  269:     # Check that it's defined
                    270:     if (!($navmap->courseMapDefined())) {
1.283     raeburn   271: 	$r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
1.55      bowersj2  272:         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
                    273:                   '</body></html>');
                    274:         return OK;
                    275:     }
                    276: 
1.178     bowersj2  277:     # See if there's only one map in the top-level, if we don't
                    278:     # already have a filter... if so, automatically display it
1.222     bowersj2  279:     # (older code; should use retrieveResources)
1.179     bowersj2  280:     if ($ENV{QUERY_STRING} !~ /filter/) {
1.178     bowersj2  281:         my $iterator = $navmap->getIterator(undef, undef, undef, 0);
1.222     bowersj2  282:         my $curRes;
1.178     bowersj2  283:         my $sequenceCount = 0;
                    284:         my $sequenceId;
1.222     bowersj2  285:         while ($curRes = $iterator->next()) {
1.178     bowersj2  286:             if (ref($curRes) && $curRes->is_sequence()) {
                    287:                 $sequenceCount++;
                    288:                 $sequenceId = $curRes->map_pc();
1.179     bowersj2  289:             }
1.178     bowersj2  290:         }
                    291:         
                    292:         if ($sequenceCount == 1) {
                    293:             # The automatic iterator creation in the render call 
                    294:             # will pick this up. We know the condition because
                    295:             # the defined($ENV{'form.filter'}) also ensures this
                    296:             # is a fresh call.
                    297:             $ENV{'form.filter'} = "$sequenceId";
1.155     bowersj2  298:         }
                    299:     }
                    300: 
1.268     albertel  301:     if ($ENV{QUERY_STRING} eq 'launchExternal') {
                    302: 	$r->print('
                    303:           <form name="returnwin" action="/adm/flip?postdata=return%3a" 
                    304:                 method="post" target="loncapaclient">
                    305:           </form>');
                    306: 	$r->print('
                    307:           <script type="text/javascript">
                    308:               this.document.returnwin.submit();
                    309:           </script>');
                    310:     }
                    311: 
                    312:     if ($ENV{'environment.remotenavmap'} ne 'on') {
1.281     albertel  313: 	$r->print(&launch_win('link','yes',\%toplinkitems));
1.268     albertel  314:     } 
                    315:     if ($ENV{'environment.remotenavmap'} eq 'on') {
1.281     albertel  316: 	&add_linkitem(\%toplinkitems,'closenav','collapse()',
                    317: 		      "Close navigation window");
1.268     albertel  318:     } 
                    319: 
1.191     bowersj2  320:     my $jumpToFirstHomework = 0;
1.184     bowersj2  321:     # Check to see if the student is jumping to next open, do-able problem
1.281     albertel  322:     if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
1.191     bowersj2  323:         $jumpToFirstHomework = 1;
1.184     bowersj2  324:         # Find the next homework problem that they can do.
                    325:         my $iterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2  326:         my $curRes;
1.184     bowersj2  327:         my $foundDoableProblem = 0;
                    328:         my $problemRes;
                    329:         
1.222     bowersj2  330:         while (($curRes = $iterator->next()) && !$foundDoableProblem) {
1.184     bowersj2  331:             if (ref($curRes) && $curRes->is_problem()) {
                    332:                 my $status = $curRes->status();
1.191     bowersj2  333:                 if ($curRes->completable()) {
1.184     bowersj2  334:                     $problemRes = $curRes;
                    335:                     $foundDoableProblem = 1;
                    336: 
                    337:                     # Pop open all previous maps
                    338:                     my $stack = $iterator->getStack();
                    339:                     pop @$stack; # last resource in the stack is the problem
                    340:                                  # itself, which we don't need in the map stack
                    341:                     my @mapPcs = map {$_->map_pc()} @$stack;
                    342:                     $ENV{'form.filter'} = join(',', @mapPcs);
                    343: 
                    344:                     # Mark as both "here" and "jump"
                    345:                     $ENV{'form.postsymb'} = $curRes->symb();
                    346:                 }
                    347:             }
                    348:         }
                    349: 
                    350:         # If we found no problems, print a note to that effect.
                    351:         if (!$foundDoableProblem) {
                    352:             $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
                    353:         }
                    354:     } else {
1.281     albertel  355: 	&add_linkitem(\%toplinkitems,'firsthomework',
                    356: 		      'location.href="navmaps?jumpToFirstHomework"',
1.287     albertel  357: 		      "Show Me My First Homework Problem");
1.184     bowersj2  358:     }
                    359: 
1.191     bowersj2  360:     my $suppressEmptySequences = 0;
                    361:     my $filterFunc = undef;
1.201     bowersj2  362:     my $resource_no_folder_link = 0;
                    363: 
1.191     bowersj2  364:     # Display only due homework.
                    365:     my $showOnlyHomework = 0;
1.276     albertel  366:     if ($ENV{'form.showOnlyHomework'} eq "1") {
1.191     bowersj2  367:         $showOnlyHomework = 1;
                    368:         $suppressEmptySequences = 1;
                    369:         $filterFunc = sub { my $res = shift; 
1.201     bowersj2  370:                             return $res->completable() || $res->is_map();
1.191     bowersj2  371:                         };
1.281     albertel  372: 	&add_linkitem(\%toplinkitems,'everything',
1.296     albertel  373: 		     'location.href="navmaps?sort='.$ENV{'form.sort'}.'"',
1.281     albertel  374: 		      "Show Everything");
1.229     www       375:         $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
1.191     bowersj2  376:         $ENV{'form.filter'} = '';
                    377:         $ENV{'form.condition'} = 1;
1.201     bowersj2  378: 	$resource_no_folder_link = 1;
1.191     bowersj2  379:     } else {
1.281     albertel  380: 	&add_linkitem(\%toplinkitems,'uncompleted',
                    381: 		      'location.href="navmaps?sort='.$ENV{'form.sort'}.
                    382: 		          '&showOnlyHomework=1"',
                    383: 		      "Show Only Uncompleted Homework");
1.191     bowersj2  384:     }
                    385: 
1.276     albertel  386:     my %selected=($ENV{'form.sort'} => 'selected=on');
                    387:     my $sort_html=("<form>
1.270     albertel  388:                  <nobr>
1.276     albertel  389:                     <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$ENV{'form.showOnlyHomework'}."\" />
                    390:                     <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
1.270     albertel  391:                     <select name=\"sort\">
1.276     albertel  392:                        <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
                    393:                        <option value=\"title\"   $selected{'title'}  >".&mt('Title')."</option>
                    394:                        <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
1.296     albertel  395:                        <option value=\"discussion\" $selected{'discussion'}>".&mt('Has Discussion')."</option>
1.270     albertel  396:                     </select>
                    397:                  </nobr>
                    398:                </form>");
1.133     bowersj2  399:     # renderer call
1.285     albertel  400:     my $renderArgs = { 'cols' => [0,1,2,3],
1.270     albertel  401: 		       'sort' => $ENV{'form.sort'},
1.191     bowersj2  402:                        'url' => '/adm/navmaps',
                    403:                        'navmap' => $navmap,
                    404:                        'suppressNavmap' => 1,
                    405:                        'suppressEmptySequences' => $suppressEmptySequences,
                    406:                        'filterFunc' => $filterFunc,
1.201     bowersj2  407: 		       'resource_no_folder_link' => $resource_no_folder_link,
1.276     albertel  408: 		       'sort_html'=> $sort_html,
1.281     albertel  409:                        'r' => $r,
                    410:                        'caller' => 'navmapsdisplay',
                    411:                        'linkitems' => \%toplinkitems};
1.191     bowersj2  412:     my $render = render($renderArgs);
                    413:     $navmap->untieHashes();
1.133     bowersj2  414: 
1.191     bowersj2  415:     # If no resources were printed, print a reassuring message so the
                    416:     # user knows there was no error.
                    417:     if ($renderArgs->{'counter'} == 0) {
                    418:         if ($showOnlyHomework) {
1.229     www       419:             $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
1.191     bowersj2  420:         } else { # both jumpToFirstHomework and normal use the same: course must be empty
                    421:             $r->print("<p><font size='+1'>This course is empty.</font></p>");
                    422:         }
                    423:     }
1.51      bowersj2  424: 
1.128     bowersj2  425:     $r->print("</body></html>");
1.134     bowersj2  426:     $r->rflush();
1.59      bowersj2  427: 
1.51      bowersj2  428:     return OK;
                    429: }
                    430: 
                    431: # Convenience functions: Returns a string that adds or subtracts
                    432: # the second argument from the first hash, appropriate for the 
                    433: # query string that determines which folders to recurse on
                    434: sub addToFilter {
                    435:     my $hashIn = shift;
                    436:     my $addition = shift;
                    437:     my %hash = %$hashIn;
                    438:     $hash{$addition} = 1;
                    439: 
                    440:     return join (",", keys(%hash));
                    441: }
                    442: 
                    443: sub removeFromFilter {
                    444:     my $hashIn = shift;
                    445:     my $subtraction = shift;
                    446:     my %hash = %$hashIn;
                    447: 
                    448:     delete $hash{$subtraction};
                    449:     return join(",", keys(%hash));
                    450: }
                    451: 
                    452: # Convenience function: Given a stack returned from getStack on the iterator,
                    453: # return the correct src() value.
                    454: # Later, this should add an anchor when we start putting anchors in pages.
                    455: sub getLinkForResource {
                    456:     my $stack = shift;
                    457:     my $res;
                    458: 
                    459:     # Check to see if there are any pages in the stack
                    460:     foreach $res (@$stack) {
1.248     www       461:         if (defined($res)) {
                    462: 	    if ($res->is_page()) {
                    463: 		return $res->src();
                    464: 	    }
                    465:             # in case folder was skipped over as "only sequence"
                    466: 	    my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
                    467: 	    if ($map=~/\.page$/) {
1.249     www       468: 		return &Apache::lonnet::clutter($map).'#'.
                    469: 		    &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
1.248     www       470: 	    }
1.51      bowersj2  471:         }
                    472:     }
                    473: 
                    474:     # Failing that, return the src of the last resource that is defined
                    475:     # (when we first recurse on a map, it puts an undefined resource
                    476:     # on the bottom because $self->{HERE} isn't defined yet, and we
                    477:     # want the src for the map anyhow)
                    478:     foreach (@$stack) {
                    479:         if (defined($_)) { $res = $_; }
                    480:     }
                    481: 
                    482:     return $res->src();
                    483: }
                    484: 
1.251     www       485: # Convenience function: This separates the logic of how to create
1.53      bowersj2  486: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
1.251     www       487: # etc.) into a separate function. It takes a resource object as the
1.53      bowersj2  488: # first parameter, and the part number of the resource as the second.
                    489: # It's basically a big switch statement on the status of the resource.
                    490: 
                    491: sub getDescription {
                    492:     my $res = shift;
                    493:     my $part = shift;
1.69      bowersj2  494:     my $status = $res->status($part);
1.53      bowersj2  495: 
1.182     bowersj2  496:     if ($status == $res->NETWORK_FAILURE) { 
1.229     www       497:         return &mt("Having technical difficulties; please check status later"); 
1.182     bowersj2  498:     }
1.53      bowersj2  499:     if ($status == $res->NOTHING_SET) {
1.229     www       500:         return &mt("Not currently assigned.");
1.53      bowersj2  501:     }
                    502:     if ($status == $res->OPEN_LATER) {
1.73      bowersj2  503:         return "Open " . timeToHumanString($res->opendate($part));
1.53      bowersj2  504:     }
                    505:     if ($status == $res->OPEN) {
1.79      bowersj2  506:         if ($res->duedate($part)) {
1.229     www       507:             return &mt("Due")."  " .timeToHumanString($res->duedate($part));
1.66      bowersj2  508:         } else {
1.229     www       509:             return &mt("Open, no due date");
1.66      bowersj2  510:         }
1.53      bowersj2  511:     }
1.54      bowersj2  512:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.229     www       513:         return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
1.54      bowersj2  514:     }
                    515:     if ($status == $res->PAST_DUE_NO_ANSWER) {
1.229     www       516:         return &mt("Was due")." " . timeToHumanString($res->duedate($part));
1.53      bowersj2  517:     }
                    518:     if ($status == $res->ANSWER_OPEN) {
1.229     www       519:         return &mt("Answer available");
1.53      bowersj2  520:     }
1.59      bowersj2  521:     if ($status == $res->EXCUSED) {
1.229     www       522:         return &mt("Excused by instructor");
1.59      bowersj2  523:     }
1.69      bowersj2  524:     if ($status == $res->ATTEMPTED) {
1.229     www       525:         return &mt("Answer submitted, not yet graded");
1.69      bowersj2  526:     }
1.59      bowersj2  527:     if ($status == $res->TRIES_LEFT) {
1.79      bowersj2  528:         my $tries = $res->tries($part);
                    529:         my $maxtries = $res->maxtries($part);
                    530:         my $triesString = "";
                    531:         if ($tries && $maxtries) {
                    532:             $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
                    533:             if ($maxtries > 1 && $maxtries - $tries == 1) {
                    534:                 $triesString = "<b>$triesString</b>";
                    535:             }
                    536:         }
1.244     albertel  537:         if ($res->duedate($part)) {
1.229     www       538:             return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
1.66      bowersj2  539:                 " $triesString";
                    540:         } else {
1.229     www       541:             return &mt("No due date")." $triesString";
1.66      bowersj2  542:         }
1.59      bowersj2  543:     }
1.185     bowersj2  544:     if ($status == $res->ANSWER_SUBMITTED) {
1.229     www       545:         return &mt('Answer submitted');
1.185     bowersj2  546:     }
1.53      bowersj2  547: }
                    548: 
1.115     bowersj2  549: # Convenience function, so others can use it: Is the problem due in less then
                    550: # 24 hours, and still can be done?
                    551: 
1.252     matthew   552: sub dueInLessThan24Hours {
1.115     bowersj2  553:     my $res = shift;
                    554:     my $part = shift;
                    555:     my $status = $res->status($part);
                    556: 
1.207     bowersj2  557:     return ($status == $res->OPEN() ||
1.115     bowersj2  558:             $status == $res->TRIES_LEFT()) &&
1.244     albertel  559: 	    $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
                    560: 	    $res->duedate($part) > time();
1.115     bowersj2  561: }
                    562: 
                    563: # Convenience function, so others can use it: Is there only one try remaining for the
                    564: # part, with more then one try to begin with, not due yet and still can be done?
                    565: sub lastTry {
                    566:     my $res = shift;
                    567:     my $part = shift;
                    568: 
                    569:     my $tries = $res->tries($part);
                    570:     my $maxtries = $res->maxtries($part);
                    571:     return $tries && $maxtries && $maxtries > 1 &&
1.244     albertel  572:         $maxtries - $tries == 1 && $res->duedate($part) &&
                    573:         $res->duedate($part) > time();
1.115     bowersj2  574: }
                    575: 
1.101     bowersj2  576: # This puts a human-readable name on the ENV variable.
1.177     www       577: 
1.68      bowersj2  578: sub advancedUser {
1.177     www       579:     return $ENV{'request.role.adv'};
1.68      bowersj2  580: }
                    581: 
1.73      bowersj2  582: 
                    583: # timeToHumanString takes a time number and converts it to a
                    584: # human-readable representation, meant to be used in the following
                    585: # manner:
                    586: # print "Due $timestring"
                    587: # print "Open $timestring"
                    588: # print "Answer available $timestring"
                    589: # Very, very, very, VERY English-only... goodness help a localizer on
                    590: # this func...
1.53      bowersj2  591: sub timeToHumanString {
1.58      albertel  592:     my ($time) = @_;
                    593:     # zero, '0' and blank are bad times
1.73      bowersj2  594:     if (!$time) {
1.229     www       595:         return &mt('never');
1.73      bowersj2  596:     }
1.231     www       597:     unless (&Apache::lonlocal::current_language()=~/^en/) {
1.237     www       598: 	return &Apache::lonlocal::locallocaltime($time);
1.229     www       599:     } 
1.73      bowersj2  600:     my $now = time();
                    601: 
                    602:     my @time = localtime($time);
                    603:     my @now = localtime($now);
                    604: 
                    605:     # Positive = future
                    606:     my $delta = $time - $now;
                    607: 
                    608:     my $minute = 60;
                    609:     my $hour = 60 * $minute;
                    610:     my $day = 24 * $hour;
                    611:     my $week = 7 * $day;
                    612:     my $inPast = 0;
                    613: 
                    614:     # Logic in comments:
                    615:     # Is it now? (extremely unlikely)
                    616:     if ( $delta == 0 ) {
                    617:         return "this instant";
                    618:     }
                    619: 
                    620:     if ($delta < 0) {
                    621:         $inPast = 1;
                    622:         $delta = -$delta;
                    623:     }
                    624: 
                    625:     if ( $delta > 0 ) {
1.101     bowersj2  626: 
1.73      bowersj2  627:         my $tense = $inPast ? " ago" : "";
                    628:         my $prefix = $inPast ? "" : "in ";
1.101     bowersj2  629:         
                    630:         # Less then a minute
1.73      bowersj2  631:         if ( $delta < $minute ) {
                    632:             if ($delta == 1) { return "${prefix}1 second$tense"; }
                    633:             return "$prefix$delta seconds$tense";
                    634:         }
                    635: 
1.101     bowersj2  636:         # Less then an hour
1.73      bowersj2  637:         if ( $delta < $hour ) {
                    638:             # If so, use minutes
                    639:             my $minutes = floor($delta / 60);
                    640:             if ($minutes == 1) { return "${prefix}1 minute$tense"; }
                    641:             return "$prefix$minutes minutes$tense";
                    642:         }
                    643:         
                    644:         # Is it less then 24 hours away? If so,
                    645:         # display hours + minutes
                    646:         if ( $delta < $hour * 24) {
                    647:             my $hours = floor($delta / $hour);
                    648:             my $minutes = floor(($delta % $hour) / $minute);
                    649:             my $hourString = "$hours hours";
                    650:             my $minuteString = ", $minutes minutes";
                    651:             if ($hours == 1) {
                    652:                 $hourString = "1 hour";
                    653:             }
                    654:             if ($minutes == 1) {
                    655:                 $minuteString = ", 1 minute";
                    656:             }
                    657:             if ($minutes == 0) {
                    658:                 $minuteString = "";
                    659:             }
                    660:             return "$prefix$hourString$minuteString$tense";
                    661:         }
                    662: 
                    663:         # Less then 5 days away, display day of the week and
                    664:         # HH:MM
                    665:         if ( $delta < $day * 5 ) {
1.85      bowersj2  666:             my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.238     albertel  667:             $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  668:             $timeStr =~ s/12:00 pm/noon/;
                    669:             return ($inPast ? "last " : "next ") .
                    670:                 $timeStr;
                    671:         }
                    672:         
                    673:         # Is it this year?
                    674:         if ( $time[5] == $now[5]) {
                    675:             # Return on Month Day, HH:MM meridian
                    676:             my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
1.238     albertel  677:             $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  678:             $timeStr =~ s/12:00 pm/noon/;
                    679:             return $timeStr;
                    680:         }
                    681: 
                    682:         # Not this year, so show the year
1.279     albertel  683:         my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
1.238     albertel  684:         $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  685:         $timeStr =~ s/12:00 pm/noon/;
                    686:         return $timeStr;
1.58      albertel  687:     }
1.53      bowersj2  688: }
                    689: 
1.51      bowersj2  690: 
1.133     bowersj2  691: =pod
                    692: 
1.174     albertel  693: =head1 NAME
                    694: 
1.217     bowersj2  695: Apache::lonnavmap - Subroutines to handle and render the navigation
                    696:     maps
1.174     albertel  697: 
                    698: =head1 SYNOPSIS
                    699: 
                    700: The main handler generates the navigational listing for the course,
                    701: the other objects export this information in a usable fashion for
1.205     bowersj2  702: other modules.
1.133     bowersj2  703: 
1.216     bowersj2  704: =head1 OVERVIEW
                    705: 
1.217     bowersj2  706: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.218     bowersj2  707: course structure and caches it in what is often referred to as the
                    708: "big hash" X<big hash>. You can see it if you are logged into
                    709: LON-CAPA, in a course, by going to /adm/test. (You may need to
                    710: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
                    711: content of the hash will be under the heading "Big Hash".
1.216     bowersj2  712: 
                    713: Big Hash contains, among other things, how resources are related
                    714: to each other (next/previous), what resources are maps, which 
                    715: resources are being chosen to not show to the student (for random
                    716: selection), and a lot of other things that can take a lot of time
                    717: to compute due to the amount of data that needs to be collected and
                    718: processed.
                    719: 
                    720: Apache::lonnavmaps provides an object model for manipulating this
                    721: information in a higher-level fashion then directly manipulating 
                    722: the hash. It also provides access to several auxilary functions 
                    723: that aren't necessarily stored in the Big Hash, but are a per-
                    724: resource sort of value, like whether there is any feedback on 
                    725: a given resource.
                    726: 
                    727: Apache::lonnavmaps also abstracts away branching, and someday, 
                    728: conditions, for the times where you don't really care about those
                    729: things.
                    730: 
                    731: Apache::lonnavmaps also provides fairly powerful routines for
                    732: rendering navmaps, and last but not least, provides the navmaps
                    733: view for when the user clicks the NAV button.
                    734: 
                    735: B<Note>: Apache::lonnavmaps I<only> works for the "currently
                    736: logged in user"; if you want things like "due dates for another
                    737: student" lonnavmaps can not directly retrieve information like
                    738: that. You need the EXT function. This module can still help,
                    739: because many things, such as the course structure, are constant
                    740: between users, and Apache::lonnavmaps can help by providing
                    741: symbs for the EXT call.
                    742: 
                    743: The rest of this file will cover the provided rendering routines, 
                    744: which can often be used without fiddling with the navmap object at
                    745: all, then documents the Apache::lonnavmaps::navmap object, which
                    746: is the key to accessing the Big Hash information, covers the use
                    747: of the Iterator (which provides the logic for traversing the 
                    748: somewhat-complicated Big Hash data structure), documents the
                    749: Apache::lonnavmaps::Resource objects that are returned by 
                    750: 
1.205     bowersj2  751: =head1 Subroutine: render
1.133     bowersj2  752: 
1.174     albertel  753: The navmap renderer package provides a sophisticated rendering of the
                    754: standard navigation maps interface into HTML. The provided nav map
                    755: handler is actually just a glorified call to this.
1.133     bowersj2  756: 
1.216     bowersj2  757: Because of the large number of parameters this function accepts,
1.174     albertel  758: instead of passing it arguments as is normal, pass it in an anonymous
1.216     bowersj2  759: hash with the desired options.
1.174     albertel  760: 
                    761: The package provides a function called 'render', called as
1.205     bowersj2  762: Apache::lonnavmaps::render({}).
1.51      bowersj2  763: 
1.133     bowersj2  764: =head2 Overview of Columns
1.51      bowersj2  765: 
1.174     albertel  766: The renderer will build an HTML table for the navmap and return
                    767: it. The table is consists of several columns, and a row for each
                    768: resource (or possibly each part). You tell the renderer how many
                    769: columns to create and what to place in each column, optionally using
1.205     bowersj2  770: one or more of the prepared columns, and the renderer will assemble
1.174     albertel  771: the table.
                    772: 
                    773: Any additional generally useful column types should be placed in the
                    774: renderer code here, so anybody can use it anywhere else. Any code
                    775: specific to the current application (such as the addition of <input>
                    776: elements in a column) should be placed in the code of the thing using
                    777: the renderer.
                    778: 
                    779: At the core of the renderer is the array reference COLS (see Example
                    780: section below for how to pass this correctly). The COLS array will
                    781: consist of entries of one of two types of things: Either an integer
                    782: representing one of the pre-packaged column types, or a sub reference
                    783: that takes a resource reference, a part number, and a reference to the
                    784: argument hash passed to the renderer, and returns a string that will
                    785: be inserted into the HTML representation as it.
                    786: 
1.216     bowersj2  787: All other parameters are ways of either changing how the columns
                    788: are printing, or which rows are shown.
                    789: 
1.174     albertel  790: The pre-packaged column names are refered to by constants in the
1.205     bowersj2  791: Apache::lonnavmaps namespace. The following currently exist:
1.51      bowersj2  792: 
1.174     albertel  793: =over 4
1.51      bowersj2  794: 
1.216     bowersj2  795: =item * B<Apache::lonnavmaps::resource>:
1.51      bowersj2  796: 
1.174     albertel  797: The general info about the resource: Link, icon for the type, etc. The
1.216     bowersj2  798: first column in the standard nav map display. This column provides the
                    799: indentation effect seen in the B<NAV> screen. This column also accepts
1.205     bowersj2  800: the following parameters in the renderer hash:
1.51      bowersj2  801: 
1.133     bowersj2  802: =over 4
1.51      bowersj2  803: 
1.216     bowersj2  804: =item * B<resource_nolink>: default false
1.51      bowersj2  805: 
1.216     bowersj2  806: If true, the resource will not be linked. By default, all non-folder
                    807: resources are linked.
1.174     albertel  808: 
1.216     bowersj2  809: =item * B<resource_part_count>: default true
1.51      bowersj2  810: 
1.216     bowersj2  811: If true, the resource will show a part count B<if> the full
                    812: part list is not displayed. (See "condense_parts" later.) If false,
                    813: the resource will never show a part count.
1.133     bowersj2  814: 
1.174     albertel  815: =item * B<resource_no_folder_link>:
1.133     bowersj2  816: 
1.174     albertel  817: If true, the resource's folder will not be clickable to open or close
                    818: it. Default is false. True implies printCloseAll is false, since you
                    819: can't close or open folders when this is on anyhow.
1.144     bowersj2  820: 
1.133     bowersj2  821: =back
1.51      bowersj2  822: 
1.225     bowersj2  823: =item * B<Apache::lonnavmaps::communication_status>:
1.174     albertel  824: 
                    825: Whether there is discussion on the resource, email for the user, or
                    826: (lumped in here) perl errors in the execution of the problem. This is
                    827: the second column in the main nav map.
                    828: 
1.225     bowersj2  829: =item * B<Apache::lonnavmaps::quick_status>:
1.51      bowersj2  830: 
1.216     bowersj2  831: An icon for the status of a problem, with five possible states:
                    832: Correct, incorrect, open, awaiting grading (for a problem where the
                    833: computer's grade is suppressed, or the computer can't grade, like
                    834: essay problem), or none (not open yet, not a problem). The
1.174     albertel  835: third column of the standard navmap.
1.51      bowersj2  836: 
1.225     bowersj2  837: =item * B<Apache::lonnavmaps::long_status>:
1.174     albertel  838: 
                    839: A text readout of the details of the current status of the problem,
                    840: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51      bowersj2  841: 
1.225     bowersj2  842: =item * B<Apache::lonnavmaps::part_status_summary>:
                    843: 
                    844: A text readout summarizing the status of the problem. If it is a
                    845: single part problem, will display "Correct", "Incorrect", 
                    846: "Not yet open", "Open", "Attempted", or "Error". If there are
                    847: multiple parts, this will output a string that in HTML will show a
                    848: status of how many parts are in each status, in color coding, trying
                    849: to match the colors of the icons within reason.
                    850: 
                    851: Note this only makes sense if you are I<not> showing parts. If 
                    852: C<showParts> is true (see below), this column will not output
                    853: anything. 
                    854: 
1.133     bowersj2  855: =back
1.51      bowersj2  856: 
1.133     bowersj2  857: If you add any others please be sure to document them here.
1.51      bowersj2  858: 
1.174     albertel  859: An example of a column renderer that will show the ID number of a
                    860: resource, along with the part name if any:
1.51      bowersj2  861: 
1.133     bowersj2  862:  sub { 
                    863:   my ($resource, $part, $params) = @_;   
                    864:   if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
                    865:   return '<td>' . $resource->{ID} . '</td>';
                    866:  }
1.51      bowersj2  867: 
1.174     albertel  868: Note these functions are responsible for the TD tags, which allow them
                    869: to override vertical and horizontal alignment, etc.
1.130     www       870: 
1.133     bowersj2  871: =head2 Parameters
1.115     bowersj2  872: 
1.217     bowersj2  873: Minimally, you should be
1.174     albertel  874: able to get away with just using 'cols' (to specify the columns
                    875: shown), 'url' (necessary for the folders to link to the current screen
                    876: correctly), and possibly 'queryString' if your app calls for it. In
                    877: that case, maintaining the state of the folders will be done
                    878: automatically.
1.140     bowersj2  879: 
1.133     bowersj2  880: =over 4
1.51      bowersj2  881: 
1.216     bowersj2  882: =item * B<iterator>: default: constructs one from %ENV
1.174     albertel  883: 
                    884: A reference to a fresh ::iterator to use from the navmaps. The
                    885: rendering will reflect the options passed to the iterator, so you can
                    886: use that to just render a certain part of the course, if you like. If
                    887: one is not passed, the renderer will attempt to construct one from
                    888: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
                    889: 'iterator_map' parameter if any.
                    890: 
1.216     bowersj2  891: =item * B<iterator_map>: default: not used
1.174     albertel  892: 
                    893: If you are letting the renderer do the iterator handling, you can
                    894: instruct the renderer to render only a particular map by passing it
                    895: the source of the map you want to process, like
                    896: '/res/103/jerf/navmap.course.sequence'.
                    897: 
1.216     bowersj2  898: =item * B<navmap>: default: constructs one from %ENV
1.174     albertel  899: 
                    900: A reference to a navmap, used only if an iterator is not passed in. If
                    901: this is necessary to make an iterator but it is not passed in, a new
                    902: one will be constructed based on ENV info. This is useful to do basic
                    903: error checking before passing it off to render.
                    904: 
1.216     bowersj2  905: =item * B<r>: default: must be passed in
1.174     albertel  906: 
                    907: The standard Apache response object. This must be passed to the
                    908: renderer or the course hash will be locked.
                    909: 
1.216     bowersj2  910: =item * B<cols>: default: empty (useless)
1.174     albertel  911: 
                    912: An array reference
                    913: 
1.216     bowersj2  914: =item * B<showParts>:default true
1.174     albertel  915: 
1.216     bowersj2  916: A flag. If true, a line for the resource itself, and a line
1.174     albertel  917: for each part will be displayed. If not, only one line for each
                    918: resource will be displayed.
                    919: 
1.216     bowersj2  920: =item * B<condenseParts>: default true
1.174     albertel  921: 
1.216     bowersj2  922: A flag. If true, if all parts of the problem have the same
1.174     albertel  923: status and that status is Nothing Set, Correct, or Network Failure,
                    924: then only one line will be displayed for that resource anyhow. If no,
                    925: all parts will always be displayed. If showParts is 0, this is
                    926: ignored.
                    927: 
1.216     bowersj2  928: =item * B<jumpCount>: default: determined from %ENV
1.174     albertel  929: 
1.216     bowersj2  930: A string identifying the URL to place the anchor 'curloc' at.
                    931: It is the responsibility of the renderer user to
1.174     albertel  932: ensure that the #curloc is in the URL. By default, determined through
                    933: the use of the ENV{} 'jump' information, and should normally "just
                    934: work" correctly.
1.144     bowersj2  935: 
1.216     bowersj2  936: =item * B<here>: default: empty string
1.140     bowersj2  937: 
1.216     bowersj2  938: A Symb identifying where to place the 'here' marker. The empty
                    939: string means no marker.
1.92      bowersj2  940: 
1.216     bowersj2  941: =item * B<indentString>: default: 25 pixel whitespace image
1.164     bowersj2  942: 
1.216     bowersj2  943: A string identifying the indentation string to use. 
1.92      bowersj2  944: 
1.216     bowersj2  945: =item * B<queryString>: default: empty
1.51      bowersj2  946: 
1.174     albertel  947: A string which will be prepended to the query string used when the
1.216     bowersj2  948: folders are opened or closed. You can use this to pass
                    949: application-specific values.
1.55      bowersj2  950: 
1.216     bowersj2  951: =item * B<url>: default: none
1.84      bowersj2  952: 
1.174     albertel  953: The url the folders will link to, which should be the current
1.216     bowersj2  954: page. Required if the resource info column is shown, and you 
                    955: are allowing the user to open and close folders.
1.115     bowersj2  956: 
1.216     bowersj2  957: =item * B<currentJumpIndex>: default: no jumping
1.55      bowersj2  958: 
1.174     albertel  959: Describes the currently-open row number to cause the browser to jump
                    960: to, because the user just opened that folder. By default, pulled from
                    961: the Jump information in the ENV{'form.*'}.
1.51      bowersj2  962: 
1.216     bowersj2  963: =item * B<printKey>: default: false
1.51      bowersj2  964: 
1.174     albertel  965: If true, print the key that appears on the top of the standard
1.216     bowersj2  966: navmaps.
1.139     bowersj2  967: 
1.216     bowersj2  968: =item * B<printCloseAll>: default: true
1.140     bowersj2  969: 
1.174     albertel  970: If true, print the "Close all folders" or "open all folders"
1.216     bowersj2  971: links.
1.140     bowersj2  972: 
1.216     bowersj2  973: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.153     bowersj2  974: 
1.174     albertel  975: A function that takes the resource object as its only parameter and
                    976: returns a true or false value. If true, the resource is displayed. If
1.216     bowersj2  977: false, it is simply skipped in the display.
1.174     albertel  978: 
1.216     bowersj2  979: =item * B<suppressEmptySequences>: default: false
1.190     bowersj2  980: 
                    981: If you're using a filter function, and displaying sequences to orient
                    982: the user, then frequently some sequences will be empty. Setting this to
                    983: true will cause those sequences not to display, so as not to confuse the
                    984: user into thinking that if the sequence is there there should be things
1.216     bowersj2  985: under it; for example, see the "Show Uncompleted Homework" view on the
                    986: B<NAV> screen.
1.190     bowersj2  987: 
1.216     bowersj2  988: =item * B<suppressNavmaps>: default: false
1.174     albertel  989: 
1.216     bowersj2  990: If true, will not display Navigate Content resources. 
1.143     bowersj2  991: 
1.133     bowersj2  992: =back
1.51      bowersj2  993: 
1.133     bowersj2  994: =head2 Additional Info
1.51      bowersj2  995: 
1.174     albertel  996: In addition to the parameters you can pass to the renderer, which will
                    997: be passed through unchange to the column renderers, the renderer will
                    998: generate the following information which your renderer may find
                    999: useful:
                   1000: 
1.216     bowersj2 1001: =over 4
                   1002: 
                   1003: =item * B<counter>: 
1.145     bowersj2 1004: 
1.216     bowersj2 1005: Contains the number of rows printed. Useful after calling the render 
                   1006: function, as you can detect whether anything was printed at all.
                   1007: 
                   1008: =item * B<isNewBranch>:
                   1009: 
                   1010: Useful for renderers: If this resource is currently the first resource
                   1011: of a new branch, this will be true. The Resource column (leftmost in the
                   1012: navmaps screen) uses this to display the "new branch" icon 
1.59      bowersj2 1013: 
1.133     bowersj2 1014: =back
1.59      bowersj2 1015: 
1.133     bowersj2 1016: =cut
1.59      bowersj2 1017: 
1.133     bowersj2 1018: sub resource { return 0; }
                   1019: sub communication_status { return 1; }
                   1020: sub quick_status { return 2; }
                   1021: sub long_status { return 3; }
1.225     bowersj2 1022: sub part_status_summary { return 4; }
1.51      bowersj2 1023: 
1.133     bowersj2 1024: sub render_resource {
                   1025:     my ($resource, $part, $params) = @_;
1.51      bowersj2 1026: 
1.133     bowersj2 1027:     my $nonLinkedText = ''; # stuff after resource title not in link
1.51      bowersj2 1028: 
1.134     bowersj2 1029:     my $link = $params->{"resourceLink"};
                   1030:     my $src = $resource->src();
                   1031:     my $it = $params->{"iterator"};
1.133     bowersj2 1032:     my $filter = $it->{FILTER};
                   1033: 
                   1034:     my $title = $resource->compTitle();
1.258     albertel 1035: 
1.133     bowersj2 1036:     my $partLabel = "";
                   1037:     my $newBranchText = "";
                   1038:     
                   1039:     # If this is a new branch, label it so
                   1040:     if ($params->{'isNewBranch'}) {
                   1041:         $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51      bowersj2 1042:     }
                   1043: 
1.133     bowersj2 1044:     # links to open and close the folder
                   1045:     my $linkopen = "<a href='$link'>";
                   1046:     my $linkclose = "</a>";
1.51      bowersj2 1047: 
1.204     albertel 1048:     # Default icon: unknown page
                   1049:     my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
1.133     bowersj2 1050:     
                   1051:     if ($resource->is_problem()) {
1.192     bowersj2 1052:         if ($part eq '0' || $params->{'condensed'}) {
1.133     bowersj2 1053:             $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
                   1054:         } else {
                   1055:             $icon = $params->{'indentString'};
                   1056:         }
1.204     albertel 1057:     } else {
1.243     albertel 1058: 	$icon = "<img src='".&Apache::loncommon::icon($resource->src).
                   1059: 	    "' alt='' border='0' />";
1.133     bowersj2 1060:     }
1.51      bowersj2 1061: 
1.133     bowersj2 1062:     # Display the correct map icon to open or shut map
                   1063:     if ($resource->is_map()) {
                   1064:         my $mapId = $resource->map_pc();
                   1065:         my $nowOpen = !defined($filter->{$mapId});
                   1066:         if ($it->{CONDITION}) {
                   1067:             $nowOpen = !$nowOpen;
                   1068:         }
1.144     bowersj2 1069: 
1.205     bowersj2 1070: 	my $folderType = $resource->is_sequence() ? 'folder' : 'page';
                   1071: 
1.144     bowersj2 1072:         if (!$params->{'resource_no_folder_link'}) {
1.205     bowersj2 1073:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.144     bowersj2 1074:             $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
                   1075: 
                   1076:             $linkopen = "<a href='" . $params->{'url'} . '?' . 
                   1077:                 $params->{'queryString'} . '&filter=';
                   1078:             $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
                   1079:                 addToFilter($filter, $mapId) :
                   1080:                 removeFromFilter($filter, $mapId);
                   1081:             $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
                   1082:                 . $params->{'hereType'} . '&here=' .
                   1083:                 &Apache::lonnet::escape($params->{'here'}) . 
1.159     bowersj2 1084:                 '&jump=' .
1.144     bowersj2 1085:                 &Apache::lonnet::escape($resource->symb()) . 
                   1086:                 "&folderManip=1'>";
                   1087:         } else {
                   1088:             # Don't allow users to manipulate folder
1.205     bowersj2 1089:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1.144     bowersj2 1090:                 '.nomanip.gif';
                   1091:             $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
                   1092: 
                   1093:             $linkopen = "";
                   1094:             $linkclose = "";
                   1095:         }
1.133     bowersj2 1096:     }
1.51      bowersj2 1097: 
1.133     bowersj2 1098:     if ($resource->randomout()) {
                   1099:         $nonLinkedText .= ' <i>(hidden)</i> ';
                   1100:     }
                   1101:     
                   1102:     # We're done preparing and finally ready to start the rendering
                   1103:     my $result = "<td align='left' valign='center'>";
1.140     bowersj2 1104: 
                   1105:     my $indentLevel = $params->{'indentLevel'};
                   1106:     if ($newBranchText) { $indentLevel--; }
                   1107: 
1.133     bowersj2 1108:     # print indentation
1.140     bowersj2 1109:     for (my $i = 0; $i < $indentLevel; $i++) {
1.133     bowersj2 1110:         $result .= $params->{'indentString'};
1.84      bowersj2 1111:     }
                   1112: 
1.133     bowersj2 1113:     # Decide what to display
                   1114:     $result .= "$newBranchText$linkopen$icon$linkclose";
                   1115:     
                   1116:     my $curMarkerBegin = '';
                   1117:     my $curMarkerEnd = '';
1.51      bowersj2 1118: 
1.133     bowersj2 1119:     # Is this the current resource?
1.158     bowersj2 1120:     if (!$params->{'displayedHereMarker'} && 
                   1121:         $resource->symb() eq $params->{'here'} ) {
1.133     bowersj2 1122:         $curMarkerBegin = '<font color="red" size="+2">&gt; </font>';
                   1123:         $curMarkerEnd = '<font color="red" size="+2">&lt;</font>';
1.158     bowersj2 1124:         $params->{'displayedHereMarker'} = 1;
1.51      bowersj2 1125:     }
                   1126: 
1.192     bowersj2 1127:     if ($resource->is_problem() && $part ne '0' && 
1.133     bowersj2 1128:         !$params->{'condensed'}) {
1.274     matthew  1129: 	my $displaypart=$resource->part_display($part);
1.245     www      1130:         $partLabel = " (Part: $displaypart)";
                   1131: 	$link.='#'.&Apache::lonnet::escape($part);
1.133     bowersj2 1132:         $title = "";
1.51      bowersj2 1133:     }
                   1134: 
1.163     bowersj2 1135:     if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133     bowersj2 1136:         $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51      bowersj2 1137:     }
                   1138: 
1.268     albertel 1139:     my $target;
                   1140:     if ($ENV{'environment.remotenavmap'} eq 'on') {
                   1141: 	$target=' target="loncapaclient" ';
                   1142:     }
1.266     raeburn  1143:     if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1.268     albertel 1144:         $result .= "  $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1.144     bowersj2 1145:     } else {
                   1146:         $result .= "  $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
                   1147:     }
1.51      bowersj2 1148: 
1.133     bowersj2 1149:     return $result;
                   1150: }
1.51      bowersj2 1151: 
1.133     bowersj2 1152: sub render_communication_status {
                   1153:     my ($resource, $part, $params) = @_;
1.134     bowersj2 1154:     my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
                   1155: 
                   1156:     my $link = $params->{"resourceLink"};
                   1157:     my $linkopen = "<a href='$link'>";
                   1158:     my $linkclose = "</a>";
                   1159: 
                   1160:     if ($resource->hasDiscussion()) {
                   1161:         $discussionHTML = $linkopen .
                   1162:             '<img border="0" src="/adm/lonMisc/chat.gif" />' .
                   1163:             $linkclose;
                   1164:     }
                   1165:     
                   1166:     if ($resource->getFeedback()) {
                   1167:         my $feedback = $resource->getFeedback();
                   1168:         foreach (split(/\,/, $feedback)) {
                   1169:             if ($_) {
                   1170:                 $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
                   1171:                     . &Apache::lonnet::escape($_) . '">'
                   1172:                     . '<img src="/adm/lonMisc/feedback.gif" '
                   1173:                     . 'border="0" /></a>';
                   1174:             }
                   1175:         }
                   1176:     }
                   1177:     
                   1178:     if ($resource->getErrors()) {
                   1179:         my $errors = $resource->getErrors();
1.254     matthew  1180:         my $errorcount = 0;
1.134     bowersj2 1181:         foreach (split(/,/, $errors)) {
1.254     matthew  1182:             last if ($errorcount>=10); # Only output 10 bombs maximum
1.134     bowersj2 1183:             if ($_) {
1.254     matthew  1184:                 $errorcount++;
1.134     bowersj2 1185:                 $errorHTML .= '&nbsp;<a href="/adm/email?display='
                   1186:                     . &Apache::lonnet::escape($_) . '">'
                   1187:                     . '<img src="/adm/lonMisc/bomb.gif" '
                   1188:                     . 'border="0" /></a>';
                   1189:             }
                   1190:         }
1.197     bowersj2 1191:     }
                   1192: 
                   1193:     if ($params->{'multipart'} && $part != '0') {
                   1194: 	$discussionHTML = $feedbackHTML = $errorHTML = '';
1.134     bowersj2 1195:     }
                   1196: 
                   1197:     return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
                   1198: 
1.133     bowersj2 1199: }
                   1200: sub render_quick_status {
                   1201:     my ($resource, $part, $params) = @_;
1.135     bowersj2 1202:     my $result = "";
                   1203:     my $firstDisplayed = !$params->{'condensed'} && 
                   1204:         $params->{'multipart'} && $part eq "0";
                   1205: 
                   1206:     my $link = $params->{"resourceLink"};
                   1207:     my $linkopen = "<a href='$link'>";
                   1208:     my $linkclose = "</a>";
                   1209: 
                   1210:     if ($resource->is_problem() &&
                   1211:         !$firstDisplayed) {
1.224     bowersj2 1212: 	
                   1213:         my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135     bowersj2 1214:         my $alt = $iconAltTags{$icon};
                   1215:         if ($icon) {
                   1216:             $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
                   1217:         } else {
                   1218:             $result .= "<td width='30'>&nbsp;</td>\n";
                   1219:         }
                   1220:     } else { # not problem, no icon
                   1221:         $result .= "<td width='30'>&nbsp;</td>\n";
                   1222:     }
                   1223: 
                   1224:     return $result;
1.133     bowersj2 1225: }
                   1226: sub render_long_status {
                   1227:     my ($resource, $part, $params) = @_;
1.136     bowersj2 1228:     my $result = "<td align='right' valign='center'>\n";
                   1229:     my $firstDisplayed = !$params->{'condensed'} && 
                   1230:         $params->{'multipart'} && $part eq "0";
                   1231:                 
                   1232:     my $color;
1.212     bowersj2 1233:     if ($resource->is_problem()) {
1.136     bowersj2 1234:         $color = $colormap{$resource->status};
                   1235:         
1.252     matthew  1236:         if (dueInLessThan24Hours($resource, $part) ||
1.136     bowersj2 1237:             lastTry($resource, $part)) {
                   1238:             $color = $hurryUpColor;
                   1239:         }
                   1240:     }
                   1241:     
                   1242:     if ($resource->kind() eq "res" &&
                   1243:         $resource->is_problem() &&
                   1244:         !$firstDisplayed) {
                   1245:         if ($color) {$result .= "<font color=\"$color\"><b>"; }
                   1246:         $result .= getDescription($resource, $part);
                   1247:         if ($color) {$result .= "</b></font>"; }
                   1248:     }
                   1249:     if ($resource->is_map() && advancedUser() && $resource->randompick()) {
                   1250:         $result .= '(randomly select ' . $resource->randompick() .')';
                   1251:     }
1.210     bowersj2 1252: 
1.213     bowersj2 1253:     # Debugging code
                   1254:     #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
                   1255:     #	' - Part: ' . $part;
                   1256: 
1.210     bowersj2 1257:     $result .= "</td>\n";
1.136     bowersj2 1258:     
                   1259:     return $result;
1.51      bowersj2 1260: }
                   1261: 
1.227     bowersj2 1262: # Colors obtained by taking the icons, matching the colors, and
                   1263: # possibly reducing the Value (HSV) of the color, if it's too bright
                   1264: # for text, generally by one third or so.
1.225     bowersj2 1265: my %statusColors = 
                   1266:     (
                   1267:      $resObj->CLOSED => '#000000',
1.227     bowersj2 1268:      $resObj->OPEN   => '#998b13',
                   1269:      $resObj->CORRECT => '#26933f',
                   1270:      $resObj->INCORRECT => '#c48207',
                   1271:      $resObj->ATTEMPTED => '#a87510',
1.225     bowersj2 1272:      $resObj->ERROR => '#000000'
                   1273:      );
                   1274: my %statusStrings = 
                   1275:     (
                   1276:      $resObj->CLOSED => 'Not yet open',
                   1277:      $resObj->OPEN   => 'Open',
                   1278:      $resObj->CORRECT => 'Correct',
                   1279:      $resObj->INCORRECT => 'Incorrect',
                   1280:      $resObj->ATTEMPTED => 'Attempted',
                   1281:      $resObj->ERROR => 'Network Error'
                   1282:      );
                   1283: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
                   1284: 
                   1285: use Data::Dumper;
                   1286: sub render_parts_summary_status {
                   1287:     my ($resource, $part, $params) = @_;
1.256     albertel 1288:     if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1.225     bowersj2 1289:     if ($params->{showParts}) { 
                   1290: 	return '<td></td>';
                   1291:     }
                   1292: 
                   1293:     my $td = "<td align='right'>\n";
                   1294:     my $endtd = "</td>\n";
1.256     albertel 1295:     my @probs;
1.225     bowersj2 1296: 
1.256     albertel 1297:     if ($resource->contains_problem) {
                   1298: 	@probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
                   1299:     } else {
                   1300: 	@probs=($resource);
                   1301:     }
                   1302:     my $return;
                   1303:     my %overallstatus;
                   1304:     my $totalParts;
                   1305:     foreach my $resource (@probs) {
                   1306: 	# If there is a single part, just show the simple status
                   1307: 	if ($resource->singlepart()) {
                   1308: 	    my $status = $resource->simpleStatus(${$resource->parts}[0]);
                   1309: 	    $overallstatus{$status}++;
                   1310: 	    $totalParts++;
                   1311: 	    next;
                   1312: 	}
                   1313: 	# Now we can be sure the $part doesn't really matter.
                   1314: 	my $statusCount = $resource->simpleStatusCount();
                   1315: 	my @counts;
                   1316: 	foreach my $status (@statuses) {
                   1317: 	    # decouple display order from the simpleStatusCount order
                   1318: 	    my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
                   1319: 	    if ($statusCount->[$slot]) {
                   1320: 		$overallstatus{$status}+=$statusCount->[$slot];
                   1321: 		$totalParts+=$statusCount->[$slot];
                   1322: 	    }
                   1323: 	}
                   1324:     }
                   1325:     $return.= $td . $totalParts . ' parts: ';
                   1326:     foreach my $status (@statuses) {
                   1327: 	if ($overallstatus{$status}) {
                   1328: 	    $return.="<font color='" . $statusColors{$status} .
                   1329: 		"'>" . $overallstatus{$status} . ' '
1.225     bowersj2 1330: 		. $statusStrings{$status} . "</font>";
                   1331: 	}
                   1332:     }
1.256     albertel 1333:     $return.= $endtd;
                   1334:     return $return;
1.225     bowersj2 1335: }
                   1336: 
1.133     bowersj2 1337: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225     bowersj2 1338:                        \&render_quick_status, \&render_long_status,
                   1339: 		       \&render_parts_summary_status);
1.132     bowersj2 1340: 
                   1341: sub setDefault {
                   1342:     my ($val, $default) = @_;
                   1343:     if (!defined($val)) { return $default; }
                   1344:     return $val;
                   1345: }
                   1346: 
1.296     albertel 1347: sub cmp_title {
                   1348:     my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
                   1349:     $atitle=~s/^\s*//;
                   1350:     $btitle=~s/^\s*//;
                   1351:     return $atitle cmp $btitle;
                   1352: }
                   1353: 
1.132     bowersj2 1354: sub render {
                   1355:     my $args = shift;
1.140     bowersj2 1356:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                   1357:     my $result = '';
                   1358: 
1.132     bowersj2 1359:     # Configure the renderer.
                   1360:     my $cols = $args->{'cols'};
                   1361:     if (!defined($cols)) {
                   1362:         # no columns, no nav maps.
                   1363:         return '';
                   1364:     }
1.140     bowersj2 1365:     my $mustCloseNavMap = 0;
                   1366:     my $navmap;
                   1367:     if (defined($args->{'navmap'})) {
                   1368:         $navmap = $args->{'navmap'};
                   1369:     }
                   1370: 
1.158     bowersj2 1371:     my $r = $args->{'r'};
1.140     bowersj2 1372:     my $queryString = $args->{'queryString'};
1.159     bowersj2 1373:     my $jump = $args->{'jump'};
1.158     bowersj2 1374:     my $here = $args->{'here'};
1.153     bowersj2 1375:     my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.256     albertel 1376:     my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1.140     bowersj2 1377:     my $currentJumpDelta = 2; # change this to change how many resources are displayed
                   1378:                              # before the current resource when using #current
                   1379: 
                   1380:     # If we were passed 'here' information, we are not rendering
                   1381:     # after a folder manipulation, and we were not passed an
                   1382:     # iterator, make sure we open the folders to show the "here"
                   1383:     # marker
                   1384:     my $filterHash = {};
                   1385:     # Figure out what we're not displaying
                   1386:     foreach (split(/\,/, $ENV{"form.filter"})) {
                   1387:         if ($_) {
                   1388:             $filterHash->{$_} = "1";
                   1389:         }
                   1390:     }
                   1391: 
1.191     bowersj2 1392:     # Filter: Remember filter function and add our own filter: Refuse
                   1393:     # to show hidden resources unless the user can see them.
                   1394:     my $userCanSeeHidden = advancedUser();
                   1395:     my $filterFunc = setDefault($args->{'filterFunc'},
                   1396:                                 sub {return 1;});
                   1397:     if (!$userCanSeeHidden) {
                   1398:         # Without renaming the filterfunc, the server seems to go into
                   1399:         # an infinite loop
                   1400:         my $oldFilterFunc = $filterFunc;
                   1401:         $filterFunc = sub { my $res = shift; return !$res->randomout() && 
                   1402:                                 &$oldFilterFunc($res);};
                   1403:     }
                   1404: 
1.140     bowersj2 1405:     my $condition = 0;
                   1406:     if ($ENV{'form.condition'}) {
                   1407:         $condition = 1;
                   1408:     }
                   1409: 
                   1410:     if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
                   1411:         # Step 1: Check to see if we have a navmap
                   1412:         if (!defined($navmap)) {
1.221     bowersj2 1413:             $navmap = Apache::lonnavmaps::navmap->new();
1.140     bowersj2 1414:             $mustCloseNavMap = 1;
                   1415:         }
                   1416: 
                   1417:         # Step two: Locate what kind of here marker is necessary
                   1418:         # Determine where the "here" marker is and where the screen jumps to.
                   1419: 
1.175     bowersj2 1420:         if ($ENV{'form.postsymb'}) {
                   1421:             $here = $jump = $ENV{'form.postsymb'};
1.140     bowersj2 1422:         } elsif ($ENV{'form.postdata'}) {
                   1423:             # couldn't find a symb, is there a URL?
                   1424:             my $currenturl = $ENV{'form.postdata'};
1.158     bowersj2 1425:             #$currenturl=~s/^http\:\/\///;
                   1426:             #$currenturl=~s/^[^\/]+//;
1.140     bowersj2 1427:             
1.158     bowersj2 1428:             $here = $jump = &Apache::lonnet::symbread($currenturl);
1.276     albertel 1429:         }
1.158     bowersj2 1430: 
1.140     bowersj2 1431:         # Step three: Ensure the folders are open
                   1432:         my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2 1433:         my $curRes;
1.140     bowersj2 1434:         my $found = 0;
                   1435:         
                   1436:         # We only need to do this if we need to open the maps to show the
                   1437:         # current position. This will change the counter so we can't count
                   1438:         # for the jump marker with this loop.
1.294     albertel 1439:         while ($here && ($curRes = $mapIterator->next()) && !$found) {
1.158     bowersj2 1440:             if (ref($curRes) && $curRes->symb() eq $here) {
1.140     bowersj2 1441:                 my $mapStack = $mapIterator->getStack();
                   1442:                 
                   1443:                 # Ensure the parent maps are open
                   1444:                 for my $map (@{$mapStack}) {
                   1445:                     if ($condition) {
                   1446:                         undef $filterHash->{$map->map_pc()};
                   1447:                     } else {
                   1448:                         $filterHash->{$map->map_pc()} = 1;
                   1449:                     }
                   1450:                 }
                   1451:                 $found = 1;
                   1452:             }
                   1453:         }            
1.159     bowersj2 1454:     }        
1.140     bowersj2 1455: 
                   1456:     if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
                   1457:         # If this is a click on a folder or something, we want to preserve the "here"
                   1458:         # from the querystring, and get the new "jump" marker
                   1459:         $here = $ENV{'form.here'};
                   1460:         $jump = $ENV{'form.jump'};
                   1461:     } 
                   1462:     
1.132     bowersj2 1463:     my $it = $args->{'iterator'};
                   1464:     if (!defined($it)) {
1.140     bowersj2 1465:         # Construct a default iterator based on $ENV{'form.'} information
                   1466:         
                   1467:         # Step 1: Check to see if we have a navmap
                   1468:         if (!defined($navmap)) {
1.221     bowersj2 1469:             $navmap = Apache::lonnavmaps::navmap->new();
1.140     bowersj2 1470:             $mustCloseNavMap = 1;
                   1471:         }
                   1472: 
1.144     bowersj2 1473:         # See if we're being passed a specific map
                   1474:         if ($args->{'iterator_map'}) {
                   1475:             my $map = $args->{'iterator_map'};
1.145     bowersj2 1476:             $map = $navmap->getResourceByUrl($map);
1.144     bowersj2 1477:             my $firstResource = $map->map_start();
                   1478:             my $finishResource = $map->map_finish();
                   1479: 
                   1480:             $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
                   1481:         } else {
                   1482:             $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
                   1483:         }
1.132     bowersj2 1484:     }
1.256     albertel 1485: 
1.159     bowersj2 1486:     # (re-)Locate the jump point, if any
1.191     bowersj2 1487:     # Note this does not take filtering or hidden into account... need
                   1488:     # to be fixed?
1.159     bowersj2 1489:     my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222     bowersj2 1490:     my $curRes;
1.159     bowersj2 1491:     my $foundJump = 0;
                   1492:     my $counter = 0;
                   1493:     
1.222     bowersj2 1494:     while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159     bowersj2 1495:         if (ref($curRes)) { $counter++; }
                   1496:         
                   1497:         if (ref($curRes) && $jump eq $curRes->symb()) {
                   1498:             
                   1499:             # This is why we have to use the main iterator instead of the
                   1500:             # potentially faster DFS: The count has to be the same, so
                   1501:             # the order has to be the same, which DFS won't give us.
                   1502:             $args->{'currentJumpIndex'} = $counter;
                   1503:             $foundJump = 1;
                   1504:         }
                   1505:     }
                   1506: 
1.132     bowersj2 1507:     my $showParts = setDefault($args->{'showParts'}, 1);
                   1508:     my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139     bowersj2 1509:     # keeps track of when the current resource is found,
                   1510:     # so we can back up a few and put the anchor above the
                   1511:     # current resource
1.140     bowersj2 1512:     my $printKey = $args->{'printKey'};
                   1513:     my $printCloseAll = $args->{'printCloseAll'};
                   1514:     if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.144     bowersj2 1515:     
1.140     bowersj2 1516:     # Print key?
                   1517:     if ($printKey) {
                   1518:         $result .= '<table border="0" cellpadding="2" cellspacing="0">';
                   1519:         my $date=localtime;
                   1520:         $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
                   1521:         if ($navmap->{LAST_CHECK}) {
                   1522:             $result .= 
1.230     www      1523:                 '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1.140     bowersj2 1524:                 strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   1525:                 '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
1.230     www      1526:                 '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1.140     bowersj2 1527:                 '</td>'; 
                   1528:         } else {
                   1529:             $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
1.230     www      1530:                 '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
                   1531:                 '&nbsp;&nbsp;<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1.140     bowersj2 1532:                 '</td>'; 
                   1533:         }
                   1534: 
                   1535:         $result .= '</tr></table>';
                   1536:     }
                   1537: 
1.172     bowersj2 1538:     if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.281     albertel 1539: 	my ($link,$text);
1.140     bowersj2 1540:         if ($condition) {
1.281     albertel 1541: 	    $link='"navmaps?condition=0&filter=&'.$queryString.
                   1542: 		'&here='.&Apache::lonnet::escape($here).'"';
                   1543: 	    $text='Close All Folders';
1.140     bowersj2 1544:         } else {
1.281     albertel 1545: 	    $link='"navmaps?condition=1&filter=&'.$queryString.
                   1546: 		'&here='.&Apache::lonnet::escape($here).'"';
                   1547: 	    $text='Open All Folders';
                   1548:         }
                   1549: 	if ($args->{'caller'} eq 'navmapsdisplay') {
                   1550: 	    &add_linkitem($args->{'linkitems'},'changefolder',
                   1551: 			  'location.href='.$link,$text);
                   1552: 	} else {
                   1553: 	    $result.='<a href='.$link.'>'.&mt($text).'</a>';
                   1554: 	}
1.266     raeburn  1555:         $result .= "\n";
                   1556:     }
1.140     bowersj2 1557: 
1.266     raeburn  1558:     # Check for any unread discussions in all resources.
1.281     albertel 1559:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.296     albertel 1560: 	&add_linkitem($args->{'linkitems'},'clearbubbles',
                   1561: 		      'document.clearbubbles.submit()',
                   1562: 		      'Mark all posts read');
1.297   ! albertel 1563: 	my $time=time;
1.296     albertel 1564: 	$result .= (<<END);
                   1565:     <form name="clearbubbles" method="post" action="/adm/feedback">
                   1566: 	<input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1.297   ! albertel 1567: 	<input type="hidden" name="navtime" value="$time" />
1.296     albertel 1568: END
                   1569:         if ($args->{'sort'} eq 'discussion') { 
                   1570: 	    my $totdisc = 0;
                   1571: 	    my $haveDisc = '';
                   1572: 	    my @allres=$navmap->retrieveResources();
                   1573: 	    foreach my $resource (@allres) {
                   1574: 		if ($resource->hasDiscussion()) {
                   1575: 		    my $ressymb;
                   1576: 		    if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
                   1577: 			$ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
                   1578: 		    } else {
                   1579: 			$ressymb = $resource->symb();
                   1580: 		    }
                   1581: 		    $haveDisc .= $ressymb.':';
                   1582: 		    $totdisc ++;
1.267     albertel 1583: 		}
                   1584: 	    }
1.296     albertel 1585: 	    if ($totdisc > 0) {
                   1586: 		$haveDisc =~ s/:$//;
                   1587: 		my $navurl = $ENV{'QUERY_STRING'};
                   1588: 		$result .= (<<END);
                   1589: 	<input type="hidden" name="navmaps" value="$haveDisc" />
                   1590:     </form>
                   1591: END
                   1592:             }
1.297   ! albertel 1593: 	}
        !          1594: 	$result.='</form>';
1.266     raeburn  1595:     }
1.276     albertel 1596: 
1.281     albertel 1597:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.283     raeburn  1598:         $result .= '<table><tr><td>'.
                   1599:                    &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
                   1600: 	if ($ENV{'environment.remotenavmap'} ne 'on') {
                   1601: 	    $result .= '<td>&nbsp;</td>'; 
                   1602:         } else {
                   1603: 	    $result .= '</tr><tr>'; 
                   1604:         }
1.281     albertel 1605: 	$result.=&show_linkitems($args->{'linkitems'});
                   1606:         if ($args->{'sort_html'}) {
                   1607: 	    if ($ENV{'environment.remotenavmap'} ne 'on') {
                   1608: 		$result.='<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>'.
                   1609: 		    '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
                   1610: 	    } else {
                   1611: 		$result.='</tr><tr><td align="left"><br />'.
                   1612: 		    $args->{'sort_html'}.'</td></tr>';
                   1613: 	    }
                   1614: 	}
                   1615:         $result .= '</table>';
                   1616:     } elsif ($args->{'sort_html'}) { 
                   1617:         $result.=$args->{'sort_html'}; 
                   1618:     }
1.276     albertel 1619: 
1.266     raeburn  1620:     $result .= "<br />\n";
1.140     bowersj2 1621:     if ($r) {
                   1622:         $r->print($result);
                   1623:         $r->rflush();
                   1624:         $result = "";
                   1625:     }
1.132     bowersj2 1626:     # End parameter setting
1.133     bowersj2 1627:             
1.132     bowersj2 1628:     # Data
1.140     bowersj2 1629:     $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132     bowersj2 1630:     my $res = "Apache::lonnavmaps::resource";
                   1631:     my %condenseStatuses =
                   1632:         ( $res->NETWORK_FAILURE    => 1,
                   1633:           $res->NOTHING_SET        => 1,
                   1634:           $res->CORRECT            => 1 );
                   1635:     my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133     bowersj2 1636: 
                   1637:     # Shared variables
                   1638:     $args->{'counter'} = 0; # counts the rows
                   1639:     $args->{'indentLevel'} = 0;
                   1640:     $args->{'isNewBranch'} = 0;
                   1641:     $args->{'condensed'} = 0;    
                   1642:     $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
                   1643:     $args->{'displayedHereMarker'} = 0;
1.132     bowersj2 1644: 
1.190     bowersj2 1645:     # If we're suppressing empty sequences, look for them here. Use DFS for speed,
                   1646:     # since structure actually doesn't matter, except what map has what resources.
                   1647:     if ($args->{'suppressEmptySequences'}) {
                   1648:         my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
                   1649:                                                          $it->{FIRST_RESOURCE},
                   1650:                                                          $it->{FINISH_RESOURCE},
                   1651:                                                          {}, undef, 1);
1.222     bowersj2 1652:         my $depth = 0;
1.190     bowersj2 1653:         $dfsit->next();
                   1654:         my $curRes = $dfsit->next();
                   1655:         while ($depth > -1) {
                   1656:             if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
                   1657:             if ($curRes == $dfsit->END_MAP()) { $depth--; }
                   1658: 
                   1659:             if (ref($curRes)) { 
                   1660:                 # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201     bowersj2 1661:                 if ($curRes->is_map()) {
1.190     bowersj2 1662:                     $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
                   1663:                     # Sequences themselves do not count as visible children,
                   1664:                     # unless those sequences also have visible children.
                   1665:                     # This means if a sequence appears, there's a "promise"
                   1666:                     # that there's something under it if you open it, somewhere.
                   1667:                 } else {
                   1668:                     # Not a sequence: if it's filtered, ignore it, otherwise
                   1669:                     # rise up the stack and mark the sequences as having children
                   1670:                     if (&$filterFunc($curRes)) {
                   1671:                         for my $sequence (@{$dfsit->getStack()}) {
                   1672:                             $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
                   1673:                         }
                   1674:                     }
                   1675:                 }
                   1676:             }
                   1677:         } continue {
                   1678:             $curRes = $dfsit->next();
                   1679:         }
                   1680:     }
                   1681: 
1.133     bowersj2 1682:     my $displayedJumpMarker = 0;
1.132     bowersj2 1683:     # Set up iteration.
                   1684:     my $now = time();
                   1685:     my $in24Hours = $now + 24 * 60 * 60;
                   1686:     my $rownum = 0;
                   1687: 
1.141     bowersj2 1688:     # export "here" marker information
                   1689:     $args->{'here'} = $here;
                   1690: 
1.222     bowersj2 1691:     $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1.270     albertel 1692:     my @resources;
                   1693:     my $code='';# sub { !(shift->is_map();) };
                   1694:     if ($args->{'sort'} eq 'title') {
1.276     albertel 1695:         my $oldFilterFunc = $filterFunc;
                   1696: 	my $filterFunc= 
                   1697: 	    sub {
                   1698: 		my ($res)=@_;
                   1699: 		if ($res->is_map()) { return 0;}
                   1700: 		return &$oldFilterFunc($res);
                   1701: 	    };
                   1702: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.296     albertel 1703: 	@resources= sort { &cmp_title($a,$b) } @resources;
                   1704:     } elsif ($args->{'sort'} eq 'duedate') {
                   1705: 	my $oldFilterFunc = $filterFunc;
                   1706: 	my $filterFunc= 
                   1707: 	    sub {
                   1708: 		my ($res)=@_;
                   1709: 		if (!$res->is_problem()) { return 0;}
                   1710: 		return &$oldFilterFunc($res);
                   1711: 	    };
                   1712: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.289     raeburn  1713: 	@resources= sort {
1.270     albertel 1714: 	    if ($a->duedate ne $b->duedate) {
                   1715: 	        return $a->duedate cmp $b->duedate;
                   1716: 	    }
1.296     albertel 1717: 	    my $value=&cmp_title($a,$b);
                   1718: 	    return $value;
1.270     albertel 1719: 	} @resources;
1.296     albertel 1720:     } elsif ($args->{'sort'} eq 'discussion') {
                   1721: 	my $oldFilterFunc = $filterFunc;
                   1722: 	my $filterFunc= 
                   1723: 	    sub {
                   1724: 		my ($res)=@_;
                   1725: 		if (!$res->hasDiscussion() &&
                   1726: 		    !$res->getFeedback() &&
                   1727: 		    !$res->getErrors()) { return 0;}
                   1728: 		return &$oldFilterFunc($res);
                   1729: 	    };
                   1730: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
                   1731: 	@resources= sort { &cmp_title($a,$b) } @resources;
1.276     albertel 1732:     } else {
                   1733: 	#unknow sort mechanism or default
                   1734: 	undef($args->{'sort'});
1.270     albertel 1735:     }
                   1736: 
1.276     albertel 1737: 
1.270     albertel 1738:     while (1) {
                   1739: 	if ($args->{'sort'}) {
                   1740: 	    $curRes = shift(@resources);
                   1741: 	} else {
                   1742: 	    $curRes = $it->next($closeAllPages);
                   1743: 	}
                   1744: 	if (!$curRes) { last; }
                   1745: 
1.132     bowersj2 1746:         # Maintain indentation level.
                   1747:         if ($curRes == $it->BEGIN_MAP() ||
                   1748:             $curRes == $it->BEGIN_BRANCH() ) {
1.133     bowersj2 1749:             $args->{'indentLevel'}++;
1.132     bowersj2 1750:         }
                   1751:         if ($curRes == $it->END_MAP() ||
                   1752:             $curRes == $it->END_BRANCH() ) {
1.133     bowersj2 1753:             $args->{'indentLevel'}--;
1.132     bowersj2 1754:         }
                   1755:         # Notice new branches
                   1756:         if ($curRes == $it->BEGIN_BRANCH()) {
1.133     bowersj2 1757:             $args->{'isNewBranch'} = 1;
                   1758:         }
                   1759: 
                   1760:         # If this isn't an actual resource, continue on
                   1761:         if (!ref($curRes)) {
                   1762:             next;
1.132     bowersj2 1763:         }
1.133     bowersj2 1764: 
1.143     bowersj2 1765:         # If this has been filtered out, continue on
                   1766:         if (!(&$filterFunc($curRes))) {
                   1767:             $args->{'isNewBranch'} = 0; # Don't falsely remember this
                   1768:             next;
                   1769:         } 
1.132     bowersj2 1770: 
1.190     bowersj2 1771:         # If this is an empty sequence and we're filtering them, continue on
1.201     bowersj2 1772:         if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190     bowersj2 1773:             !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
                   1774:             next;
                   1775:         }
                   1776: 
1.153     bowersj2 1777:         # If we're suppressing navmaps and this is a navmap, continue on
                   1778:         if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
                   1779:             next;
                   1780:         }
                   1781: 
1.191     bowersj2 1782:         $args->{'counter'}++;
                   1783: 
1.132     bowersj2 1784:         # Does it have multiple parts?
1.133     bowersj2 1785:         $args->{'multipart'} = 0;
                   1786:         $args->{'condensed'} = 0;
1.132     bowersj2 1787:         my @parts;
                   1788:             
                   1789:         # Decide what parts to show.
1.133     bowersj2 1790:         if ($curRes->is_problem() && $showParts) {
1.132     bowersj2 1791:             @parts = @{$curRes->parts()};
1.192     bowersj2 1792:             $args->{'multipart'} = $curRes->multipart();
1.132     bowersj2 1793:             
                   1794:             if ($condenseParts) { # do the condensation
                   1795:                 if (!$curRes->opendate("0")) {
1.162     bowersj2 1796:                     @parts = ();
1.133     bowersj2 1797:                     $args->{'condensed'} = 1;
1.132     bowersj2 1798:                 }
1.133     bowersj2 1799:                 if (!$args->{'condensed'}) {
1.132     bowersj2 1800:                     # Decide whether to condense based on similarity
1.192     bowersj2 1801:                     my $status = $curRes->status($parts[0]);
                   1802:                     my $due = $curRes->duedate($parts[0]);
                   1803:                     my $open = $curRes->opendate($parts[0]);
1.132     bowersj2 1804:                     my $statusAllSame = 1;
                   1805:                     my $dueAllSame = 1;
                   1806:                     my $openAllSame = 1;
1.192     bowersj2 1807:                     for (my $i = 1; $i < scalar(@parts); $i++) {
1.132     bowersj2 1808:                         if ($curRes->status($parts[$i]) != $status){
                   1809:                             $statusAllSame = 0;
                   1810:                         }
                   1811:                         if ($curRes->duedate($parts[$i]) != $due ) {
                   1812:                             $dueAllSame = 0;
                   1813:                         }
                   1814:                         if ($curRes->opendate($parts[$i]) != $open) {
                   1815:                             $openAllSame = 0;
                   1816:                         }
                   1817:                     }
                   1818:                     # $*allSame is true if all the statuses were
                   1819:                     # the same. Now, if they are all the same and
                   1820:                     # match one of the statuses to condense, or they
                   1821:                     # are all open with the same due date, or they are
                   1822:                     # all OPEN_LATER with the same open date, display the
                   1823:                     # status of the first non-zero part (to get the 'correct'
                   1824:                     # status right, since 0 is never 'correct' or 'open').
                   1825:                     if (($statusAllSame && defined($condenseStatuses{$status})) ||
                   1826:                         ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                   1827:                         ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192     bowersj2 1828:                         @parts = ($parts[0]);
1.133     bowersj2 1829:                         $args->{'condensed'} = 1;
1.132     bowersj2 1830:                     }
                   1831:                 }
1.198     bowersj2 1832: 		# Multipart problem with one part: always "condense" (happens
                   1833: 		#  to match the desirable behavior)
                   1834: 		if ($curRes->countParts() == 1) {
                   1835: 		    @parts = ($parts[0]);
                   1836: 		    $args->{'condensed'} = 1;
                   1837: 		}
1.132     bowersj2 1838:             }
1.157     bowersj2 1839:         } 
1.132     bowersj2 1840:             
                   1841:         # If the multipart problem was condensed, "forget" it was multipart
                   1842:         if (scalar(@parts) == 1) {
1.133     bowersj2 1843:             $args->{'multipart'} = 0;
1.192     bowersj2 1844:         } else {
                   1845:             # Add part 0 so we display it correctly.
                   1846:             unshift @parts, '0';
1.132     bowersj2 1847:         }
                   1848: 
                   1849:         # Now, we've decided what parts to show. Loop through them and
                   1850:         # show them.
1.192     bowersj2 1851:         foreach my $part (@parts) {
1.132     bowersj2 1852:             $rownum ++;
                   1853:             my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
                   1854:             
                   1855:             $result .= "  <tr bgcolor='$backgroundColor'>\n";
1.134     bowersj2 1856: 
                   1857:             # Set up some data about the parts that the cols might want
                   1858:             my $filter = $it->{FILTER};
1.270     albertel 1859: 	    my $src;
                   1860: 	    if ($args->{'sort'}) {
                   1861: 		$src = $curRes->src(); # FIXME this is wrong for .pages
                   1862: 	    } else {
                   1863: 		my $stack = $it->getStack();
                   1864: 		$src=getLinkForResource($stack);
                   1865: 	    }
1.249     www      1866:             my $anchor='';
1.270     albertel 1867:             if ($src=~s/(\#.*)$//) {
1.249     www      1868: 		$anchor=$1;
                   1869: 	    }
1.134     bowersj2 1870:             my $srcHasQuestion = $src =~ /\?/;
                   1871:             $args->{"resourceLink"} = $src.
                   1872:                 ($srcHasQuestion?'&':'?') .
1.249     www      1873:                 'symb=' . &Apache::lonnet::escape($curRes->symb()).
                   1874: 		$anchor;
1.270     albertel 1875: 
1.132     bowersj2 1876:             # Now, display each column.
                   1877:             foreach my $col (@$cols) {
1.139     bowersj2 1878:                 my $colHTML = '';
                   1879:                 if (ref($col)) {
                   1880:                     $colHTML .= &$col($curRes, $part, $args);
                   1881:                 } else {
                   1882:                     $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
                   1883:                 }
1.132     bowersj2 1884: 
1.133     bowersj2 1885:                 # If this is the first column and it's time to print
                   1886:                 # the anchor, do so
                   1887:                 if ($col == $cols->[0] && 
                   1888:                     $args->{'counter'} == $args->{'currentJumpIndex'} - 
1.139     bowersj2 1889:                     $currentJumpDelta) {
                   1890:                     # Jam the anchor after the <td> tag;
                   1891:                     # necessary for valid HTML (which Mozilla requires)
                   1892:                     $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133     bowersj2 1893:                     $displayedJumpMarker = 1;
                   1894:                 }
1.139     bowersj2 1895:                 $result .= $colHTML . "\n";
1.132     bowersj2 1896:             }
1.139     bowersj2 1897:             $result .= "    </tr>\n";
1.140     bowersj2 1898:             $args->{'isNewBranch'} = 0;
1.139     bowersj2 1899:         }
1.153     bowersj2 1900: 
1.139     bowersj2 1901:         if ($r && $rownum % 20 == 0) {
                   1902:             $r->print($result);
                   1903:             $result = "";
                   1904:             $r->rflush();
1.132     bowersj2 1905:         }
1.156     bowersj2 1906:     } continue {
1.208     bowersj2 1907: 	if ($r) {
                   1908: 	    # If we have the connection, make sure the user is still connected
                   1909: 	    my $c = $r->connection;
                   1910: 	    if ($c->aborted()) {
                   1911: 		# Who cares what we do, nobody will see it anyhow.
                   1912: 		return '';
                   1913: 	    }
                   1914: 	}
1.132     bowersj2 1915:     }
                   1916:     
1.134     bowersj2 1917:     # Print out the part that jumps to #curloc if it exists
1.159     bowersj2 1918:     # delay needed because the browser is processing the jump before
                   1919:     # it finishes rendering, so it goes to the wrong place!
                   1920:     # onload might be better, but this routine has no access to that.
                   1921:     # On mozilla, the 0-millisecond timeout seems to prevent this;
                   1922:     # it's quite likely this might fix other browsers, too, and 
                   1923:     # certainly won't hurt anything.
1.139     bowersj2 1924:     if ($displayedJumpMarker) {
1.247     albertel 1925:         $result .= "
                   1926: <script>
                   1927: if (location.href.indexOf('#curloc')==-1) {
                   1928:     setTimeout(\"location += '#curloc';\", 0)
                   1929: }
                   1930: </script>";
1.134     bowersj2 1931:     }
                   1932: 
1.132     bowersj2 1933:     $result .= "</table>";
1.140     bowersj2 1934:     
                   1935:     if ($r) {
                   1936:         $r->print($result);
                   1937:         $result = "";
                   1938:         $r->rflush();
                   1939:     }
                   1940:         
1.175     bowersj2 1941:     if ($mustCloseNavMap) { $navmap->untieHashes(); } 
1.132     bowersj2 1942: 
                   1943:     return $result;
                   1944: }
                   1945: 
1.281     albertel 1946: sub add_linkitem {
                   1947:     my ($linkitems,$name,$cmd,$text)=@_;
                   1948:     $$linkitems{$name}{'cmd'}=$cmd;
                   1949:     $$linkitems{$name}{'text'}=&mt($text);
                   1950: }
                   1951: 
                   1952: sub show_linkitems {
                   1953:     my ($linkitems)=@_;
                   1954:     my @linkorder = ("launchnav","closenav","firsthomework","everything",
                   1955: 		     "uncompleted","changefolder","clearbubbles");
                   1956:     
                   1957:     my $result .= (<<ENDBLOCK);
1.283     raeburn  1958:               <td align="left">
1.281     albertel 1959: <script type="text/javascript">
                   1960:     function changeNavDisplay () {
                   1961: 	var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
                   1962: ENDBLOCK
                   1963:     foreach my $link (@linkorder) {
                   1964: 	$result.= "if (navchoice == '$link') {".
                   1965: 	    $linkitems->{$link}{'cmd'}."}\n";
                   1966:     }
                   1967:     $result.='}
                   1968:               </script>
                   1969:                    <form name="linkitems" method="post">
                   1970:                        <nobr><select name="toplink">'."\n";
                   1971:     foreach my $link (@linkorder) {
                   1972: 	if (defined($linkitems->{$link})) {
                   1973: 	    if ($linkitems->{$link}{'text'} ne '') {
                   1974: 		$result .= ' <option value="'.$link.'">'.
                   1975: 		    $linkitems->{$link}{'text'}."</option>\n";
                   1976: 	    }
                   1977: 	}
                   1978:     }
                   1979:     $result .= '</select>&nbsp;<input type="button" name="chgnav"
                   1980:                    value="Go" onClick="javascript:changeNavDisplay()" />
                   1981:                 </nobr></form></td>'."\n";
                   1982:     return $result;
                   1983: }
                   1984: 
1.133     bowersj2 1985: 1;
                   1986: 
                   1987: package Apache::lonnavmaps::navmap;
                   1988: 
                   1989: =pod
                   1990: 
1.216     bowersj2 1991: =head1 Object: Apache::lonnavmaps::navmap
1.133     bowersj2 1992: 
1.217     bowersj2 1993: =head2 Overview
1.133     bowersj2 1994: 
1.217     bowersj2 1995: The navmap object's job is to provide access to the resources
                   1996: in the course as Apache::lonnavmaps::resource objects, and to
                   1997: query and manage the relationship between those resource objects.
                   1998: 
                   1999: Generally, you'll use the navmap object in one of three basic ways.
                   2000: In order of increasing complexity and power:
                   2001: 
                   2002: =over 4
                   2003: 
                   2004: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
                   2005:     various ways to obtain resource objects, based on various identifiers.
                   2006:     Use this when you want to request information about one object or 
                   2007:     a handful of resources you already know the identities of, from some
                   2008:     other source. For more about Ids, Symbs, and MapPcs, see the
                   2009:     Resource documentation. Note that Url should be a B<last resort>,
                   2010:     not your first choice; it only works when there is only one
                   2011:     instance of the resource in the course, which only applies to
                   2012:     maps, and even that may change in the future.
                   2013: 
                   2014: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
                   2015:     retrieves resources matching some criterion and returns them
                   2016:     in a flat array, with no structure information. Use this when
                   2017:     you are manipulating a series of resources, based on what map
                   2018:     the are in, but do not care about branching, or exactly how
                   2019:     the maps and resources are related. This is the most common case.
                   2020: 
                   2021: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
                   2022:     the course's navmap in various ways without writing the traversal
                   2023:     code yourself. See iterator documentation below. Use this when
                   2024:     you need to know absolutely everything about the course, including
                   2025:     branches and the precise relationship between maps and resources.
                   2026: 
                   2027: =back
                   2028: 
                   2029: =head2 Creation And Destruction
                   2030: 
                   2031: To create a navmap object, use the following function:
1.133     bowersj2 2032: 
                   2033: =over 4
                   2034: 
1.221     bowersj2 2035: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133     bowersj2 2036: 
1.221     bowersj2 2037: Creates a new navmap object. Returns the navmap object if this is
                   2038: successful, or B<undef> if not.
1.174     albertel 2039: 
1.216     bowersj2 2040: =back
                   2041: 
1.217     bowersj2 2042: When you are done with the $navmap object, you I<must> call 
                   2043: $navmap->untieHashes(), or you'll prevent the current user from using that 
                   2044: course until the web server is restarted. (!)
                   2045: 
1.216     bowersj2 2046: =head2 Methods
                   2047: 
                   2048: =over 4
                   2049: 
1.174     albertel 2050: =item * B<getIterator>(first, finish, filter, condition):
                   2051: 
                   2052: See iterator documentation below.
1.133     bowersj2 2053: 
                   2054: =cut
                   2055: 
                   2056: use strict;
                   2057: use GDBM_File;
                   2058: 
                   2059: sub new {
                   2060:     # magic invocation to create a class instance
                   2061:     my $proto = shift;
                   2062:     my $class = ref($proto) || $proto;
                   2063:     my $self = {};
                   2064: 
                   2065:     # Resource cache stores navmap resources as we reference them. We generate
                   2066:     # them on-demand so we don't pay for creating resources unless we use them.
                   2067:     $self->{RESOURCE_CACHE} = {};
                   2068: 
                   2069:     # Network failure flag, if we accessed the course or user opt and
                   2070:     # failed
                   2071:     $self->{NETWORK_FAILURE} = 0;
                   2072: 
                   2073:     # tie the nav hash
                   2074: 
1.168     bowersj2 2075:     my %navmaphash;
                   2076:     my %parmhash;
1.220     bowersj2 2077:     my $courseFn = $ENV{"request.course.fn"};
                   2078:     if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133     bowersj2 2079:               &GDBM_READER(), 0640))) {
                   2080:         return undef;
                   2081:     }
                   2082:     
1.220     bowersj2 2083:     if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133     bowersj2 2084:               &GDBM_READER(), 0640)))
                   2085:     {
1.170     matthew  2086:         untie %{$self->{PARM_HASH}};
1.133     bowersj2 2087:         return undef;
                   2088:     }
                   2089: 
1.199     bowersj2 2090:     $self->{NAV_HASH} = \%navmaphash;
1.168     bowersj2 2091:     $self->{PARM_HASH} = \%parmhash;
1.221     bowersj2 2092:     $self->{PARM_CACHE} = {};
1.133     bowersj2 2093: 
                   2094:     bless($self);
                   2095:         
                   2096:     return $self;
                   2097: }
                   2098: 
1.221     bowersj2 2099: sub generate_course_user_opt {
1.133     bowersj2 2100:     my $self = shift;
1.221     bowersj2 2101:     if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133     bowersj2 2102: 
1.221     bowersj2 2103:     my $uname=$ENV{'user.name'};
                   2104:     my $udom=$ENV{'user.domain'};
                   2105:     my $uhome=$ENV{'user.home'};
                   2106:     my $cid=$ENV{'request.course.id'};
                   2107:     my $chome=$ENV{'course.'.$cid.'.home'};
                   2108:     my ($cdom,$cnum)=split(/\_/,$cid);
                   2109:     
                   2110:     my $userprefix=$uname.'_'.$udom.'_';
                   2111:     
                   2112:     my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
                   2113:     unless ($uhome eq 'no_host') { 
1.133     bowersj2 2114: # ------------------------------------------------- Get coursedata (if present)
1.221     bowersj2 2115: 	unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                   2116: 	    my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                   2117: 					     ':resourcedata',$chome);
                   2118: 	    # Check for network failure
                   2119: 	    if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
                   2120: 		$self->{NETWORK_FAILURE} = 1;
                   2121: 	    } elsif ($reply!~/^error\:/) {
                   2122: 		$courserdatas{$cid}=$reply;
                   2123: 		$courserdatas{$cid.'.last_cache'}=time;
                   2124: 	    }
                   2125: 	}
                   2126: 	foreach (split(/\&/,$courserdatas{$cid})) {
                   2127: 	    my ($name,$value)=split(/\=/,$_);
                   2128: 	    $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
                   2129: 		&Apache::lonnet::unescape($value);
                   2130: 	}
1.133     bowersj2 2131: # --------------------------------------------------- Get userdata (if present)
1.221     bowersj2 2132: 	unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
                   2133: 	    my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
                   2134: 	    if ($reply!~/^error\:/) {
                   2135: 		$userrdatas{$uname.'___'.$udom}=$reply;
                   2136: 		$userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
                   2137: 	    }
                   2138: 	    # check to see if network failed
                   2139: 	    elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                   2140: 	    {
                   2141: 		$self->{NETWORK_FAILURE} = 1;
                   2142: 	    }
                   2143: 	}
                   2144: 	foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
                   2145: 	    my ($name,$value)=split(/\=/,$_);
                   2146: 	    $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
                   2147: 		&Apache::lonnet::unescape($value);
                   2148: 	}
                   2149: 	$self->{COURSE_OPT} = \%courseopt;
                   2150: 	$self->{USER_OPT} = \%useropt;
                   2151:     }
                   2152: 
                   2153:     $self->{COURSE_USER_OPT_GENERATED} = 1;
                   2154:     
                   2155:     return;
                   2156: }
                   2157: 
                   2158: sub generate_email_discuss_status {
                   2159:     my $self = shift;
1.259     raeburn  2160:     my $symb = shift;
1.221     bowersj2 2161:     if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133     bowersj2 2162: 
1.221     bowersj2 2163:     my $cid=$ENV{'request.course.id'};
                   2164:     my ($cdom,$cnum)=split(/\_/,$cid);
                   2165:     
                   2166:     my %emailstatus = &Apache::lonnet::dump('email_status');
                   2167:     my $logoutTime = $emailstatus{'logout'};
                   2168:     my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
                   2169:     $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
                   2170: 			   $courseLeaveTime : $logoutTime);
                   2171:     my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                   2172: 					       $cdom, $cnum);
1.259     raeburn  2173:     my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
                   2174:                                         $ENV{'user.domain'},$ENV{'user.name'},'lastread');
                   2175:     my %lastreadtime = ();
                   2176:     foreach (keys %lastread) {
                   2177:         my $key = $_;
                   2178:         $key =~ s/_lastread$//;
                   2179:         $lastreadtime{$key} = $lastread{$_};
                   2180:     }
                   2181: 
1.221     bowersj2 2182:     my %feedback=();
                   2183:     my %error=();
                   2184:     my $keys = &Apache::lonnet::reply('keys:'.
                   2185: 				      $ENV{'user.domain'}.':'.
                   2186: 				      $ENV{'user.name'}.':nohist_email',
                   2187: 				      $ENV{'user.home'});
                   2188:     
                   2189:     foreach my $msgid (split(/\&/, $keys)) {
                   2190: 	$msgid=&Apache::lonnet::unescape($msgid);
1.295     albertel 2191: 	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
                   2192: 	    my $plain=
                   2193: 		&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
                   2194: 	    if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
                   2195: 		my ($what,$url)=($1,$2);
1.221     bowersj2 2196: 		if ($what eq 'Error') {
                   2197: 		    $error{$url}.=','.$msgid; 
                   2198: 		} else {
                   2199: 		    $feedback{$url}.=','.$msgid;
                   2200: 		}
                   2201: 	    }
                   2202: 	}
1.211     bowersj2 2203:     }
1.221     bowersj2 2204:     
1.295     albertel 2205:     #url's of resources that have feedbacks
1.221     bowersj2 2206:     $self->{FEEDBACK} = \%feedback;
1.295     albertel 2207:     #or errors
                   2208:     $self->{ERROR_MSG} = \%error;
1.221     bowersj2 2209:     $self->{DISCUSSION_TIME} = \%discussiontime;
                   2210:     $self->{EMAIL_STATUS} = \%emailstatus;
1.259     raeburn  2211:     $self->{LAST_READ} = \%lastreadtime;
1.221     bowersj2 2212:     
                   2213:     $self->{EMAIL_DISCUSS_GENERATED} = 1;
                   2214: }
                   2215: 
                   2216: sub get_user_data {
                   2217:     my $self = shift;
                   2218:     if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211     bowersj2 2219: 
1.221     bowersj2 2220:     # Retrieve performance data on problems
                   2221:     my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
                   2222: 						   $ENV{'user.domain'},
                   2223: 						   $ENV{'user.name'});
                   2224:     $self->{STUDENT_DATA} = \%student_data;
1.133     bowersj2 2225: 
1.221     bowersj2 2226:     $self->{RETRIEVED_USER_DATA} = 1;
1.133     bowersj2 2227: }
                   2228: 
                   2229: # Internal function: Takes a key to look up in the nav hash and implements internal
                   2230: # memory caching of that key.
                   2231: sub navhash {
                   2232:     my $self = shift; my $key = shift;
                   2233:     return $self->{NAV_HASH}->{$key};
                   2234: }
                   2235: 
1.217     bowersj2 2236: =pod
                   2237: 
                   2238: =item * B<courseMapDefined>(): Returns true if the course map is defined, 
                   2239:     false otherwise. Undefined course maps indicate an error somewhere in
                   2240:     LON-CAPA, and you will not be able to proceed with using the navmap.
                   2241:     See the B<NAV> screen for an example of using this.
                   2242: 
                   2243: =cut
                   2244: 
1.133     bowersj2 2245: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   2246: sub courseMapDefined {
                   2247:     my $self = shift;
                   2248:     my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
                   2249: 
                   2250:     my $firstres = $self->navhash("map_start_$uri");
                   2251:     my $lastres = $self->navhash("map_finish_$uri");
                   2252:     return $firstres && $lastres;
                   2253: }
                   2254: 
                   2255: sub getIterator {
                   2256:     my $self = shift;
                   2257:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
                   2258:                                                      shift, undef, shift);
                   2259:     return $iterator;
                   2260: }
                   2261: 
                   2262: # unties the hash when done
                   2263: sub untieHashes {
1.168     bowersj2 2264:     my $self = shift;
1.170     matthew  2265:     untie %{$self->{NAV_HASH}};
                   2266:     untie %{$self->{PARM_HASH}};
1.133     bowersj2 2267: }
                   2268: 
                   2269: # Private method: Does the given resource (as a symb string) have
                   2270: # current discussion? Returns 0 if chat/mail data not extracted.
                   2271: sub hasDiscussion {
                   2272:     my $self = shift;
                   2273:     my $symb = shift;
1.221     bowersj2 2274:     
                   2275:     $self->generate_email_discuss_status();
                   2276: 
1.133     bowersj2 2277:     if (!defined($self->{DISCUSSION_TIME})) { return 0; }
                   2278: 
                   2279:     #return defined($self->{DISCUSSION_TIME}->{$symb});
1.259     raeburn  2280: 
                   2281: # backward compatibility (bulletin boards used to be 'wrapped')
                   2282:     my $ressymb = $symb;
                   2283:     if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
1.266     raeburn  2284:         unless ($ressymb =~ m|adm/wrapper/adm|) {
1.259     raeburn  2285:             $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
                   2286:         }
                   2287:     }
                   2288: 
                   2289:     if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
                   2290:         return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
                   2291:     } else {
1.266     raeburn  2292: #        return $self->{DISCUSSION_TIME}->{$ressymb} >  $self->{LAST_CHECK}; # v.1.1 behavior 
                   2293:         return $self->{DISCUSSION_TIME}->{$ressymb} >  0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
1.259     raeburn  2294:     }
1.133     bowersj2 2295: }
                   2296: 
                   2297: # Private method: Does the given resource (as a symb string) have
                   2298: # current feedback? Returns the string in the feedback hash, which
                   2299: # will be false if it does not exist.
                   2300: sub getFeedback { 
                   2301:     my $self = shift;
                   2302:     my $symb = shift;
                   2303: 
1.221     bowersj2 2304:     $self->generate_email_discuss_status();
                   2305: 
1.133     bowersj2 2306:     if (!defined($self->{FEEDBACK})) { return ""; }
                   2307:     
                   2308:     return $self->{FEEDBACK}->{$symb};
                   2309: }
                   2310: 
                   2311: # Private method: Get the errors for that resource (by source).
                   2312: sub getErrors { 
                   2313:     my $self = shift;
                   2314:     my $src = shift;
1.221     bowersj2 2315: 
                   2316:     $self->generate_email_discuss_status();
                   2317: 
1.133     bowersj2 2318:     if (!defined($self->{ERROR_MSG})) { return ""; }
                   2319:     return $self->{ERROR_MSG}->{$src};
                   2320: }
                   2321: 
                   2322: =pod
                   2323: 
1.174     albertel 2324: =item * B<getById>(id):
                   2325: 
                   2326: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
                   2327: object for that resource. This method, or other methods that use it
                   2328: (as in the resource object) is the only proper way to obtain a
                   2329: resource object.
1.133     bowersj2 2330: 
1.194     bowersj2 2331: =item * B<getBySymb>(symb):
                   2332: 
                   2333: Based on the symb of the resource, get a resource object for that
                   2334: resource. This is one of the proper ways to get a resource object.
                   2335: 
                   2336: =item * B<getMapByMapPc>(map_pc):
                   2337: 
                   2338: Based on the map_pc of the resource, get a resource object for
                   2339: the given map. This is one of the proper ways to get a resource object.
                   2340: 
1.133     bowersj2 2341: =cut
                   2342: 
                   2343: # The strategy here is to cache the resource objects, and only construct them
                   2344: # as we use them. The real point is to prevent reading any more from the tied
                   2345: # hash then we have to, which should hopefully alleviate speed problems.
                   2346: 
                   2347: sub getById {
                   2348:     my $self = shift;
                   2349:     my $id = shift;
                   2350: 
                   2351:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   2352:     {
                   2353:         return $self->{RESOURCE_CACHE}->{$id};
                   2354:     }
                   2355: 
                   2356:     # resource handles inserting itself into cache.
                   2357:     # Not clear why the quotes are necessary, but as of this
                   2358:     # writing it doesn't work without them.
                   2359:     return "Apache::lonnavmaps::resource"->new($self, $id);
1.132     bowersj2 2360: }
1.133     bowersj2 2361: 
1.172     bowersj2 2362: sub getBySymb {
                   2363:     my $self = shift;
                   2364:     my $symb = shift;
1.277     matthew  2365: 
1.228     albertel 2366:     my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172     bowersj2 2367:     my $map = $self->getResourceByUrl($mapUrl);
1.277     matthew  2368:     my $returnvalue = undef;
                   2369:     if (ref($map)) {
                   2370:         $returnvalue = $self->getById($map->map_pc() .'.'.$id);
                   2371:     }
                   2372:     return $returnvalue;
1.194     bowersj2 2373: }
                   2374: 
                   2375: sub getByMapPc {
                   2376:     my $self = shift;
                   2377:     my $map_pc = shift;
                   2378:     my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
                   2379:     $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
                   2380:     return $self->getById($map_id);
1.172     bowersj2 2381: }
                   2382: 
1.133     bowersj2 2383: =pod
                   2384: 
1.174     albertel 2385: =item * B<firstResource>():
                   2386: 
                   2387: Returns a resource object reference corresponding to the first
                   2388: resource in the navmap.
1.133     bowersj2 2389: 
                   2390: =cut
                   2391: 
                   2392: sub firstResource {
                   2393:     my $self = shift;
                   2394:     my $firstResource = $self->navhash('map_start_' .
                   2395:                      &Apache::lonnet::clutter($ENV{'request.course.uri'}));
                   2396:     return $self->getById($firstResource);
1.132     bowersj2 2397: }
1.133     bowersj2 2398: 
                   2399: =pod
                   2400: 
1.174     albertel 2401: =item * B<finishResource>():
                   2402: 
                   2403: Returns a resource object reference corresponding to the last resource
                   2404: in the navmap.
1.133     bowersj2 2405: 
                   2406: =cut
                   2407: 
                   2408: sub finishResource {
                   2409:     my $self = shift;
                   2410:     my $firstResource = $self->navhash('map_finish_' .
                   2411:                      &Apache::lonnet::clutter($ENV{'request.course.uri'}));
                   2412:     return $self->getById($firstResource);
1.132     bowersj2 2413: }
1.133     bowersj2 2414: 
                   2415: # Parmval reads the parm hash and cascades the lookups. parmval_real does
                   2416: # the actual lookup; parmval caches the results.
                   2417: sub parmval {
                   2418:     my $self = shift;
                   2419:     my ($what,$symb)=@_;
                   2420:     my $hashkey = $what."|||".$symb;
                   2421: 
                   2422:     if (defined($self->{PARM_CACHE}->{$hashkey})) {
                   2423:         return $self->{PARM_CACHE}->{$hashkey};
                   2424:     }
                   2425: 
                   2426:     my $result = $self->parmval_real($what, $symb);
                   2427:     $self->{PARM_CACHE}->{$hashkey} = $result;
                   2428:     return $result;
1.132     bowersj2 2429: }
                   2430: 
1.133     bowersj2 2431: sub parmval_real {
                   2432:     my $self = shift;
1.219     albertel 2433:     my ($what,$symb,$recurse) = @_;
1.133     bowersj2 2434: 
1.221     bowersj2 2435:     # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
                   2436:     $self->generate_course_user_opt();
                   2437: 
1.133     bowersj2 2438:     my $cid=$ENV{'request.course.id'};
                   2439:     my $csec=$ENV{'request.course.sec'};
                   2440:     my $uname=$ENV{'user.name'};
                   2441:     my $udom=$ENV{'user.domain'};
                   2442: 
                   2443:     unless ($symb) { return ''; }
                   2444:     my $result='';
                   2445: 
1.226     www      2446:     my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.133     bowersj2 2447: 
                   2448: # ----------------------------------------------------- Cascading lookup scheme
                   2449:     my $rwhat=$what;
                   2450:     $what=~s/^parameter\_//;
                   2451:     $what=~s/\_/\./;
                   2452: 
                   2453:     my $symbparm=$symb.'.'.$what;
                   2454:     my $mapparm=$mapname.'___(all).'.$what;
                   2455:     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
                   2456: 
                   2457:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   2458:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   2459:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   2460: 
                   2461:     my $courselevel= $usercourseprefix.'.'.$what;
                   2462:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   2463:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   2464: 
                   2465:     my $useropt = $self->{USER_OPT};
                   2466:     my $courseopt = $self->{COURSE_OPT};
                   2467:     my $parmhash = $self->{PARM_HASH};
                   2468: 
                   2469: # ---------------------------------------------------------- first, check user
                   2470:     if ($uname and defined($useropt)) {
                   2471:         if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
                   2472:         if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
                   2473:         if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
                   2474:     }
                   2475: 
                   2476: # ------------------------------------------------------- second, check course
                   2477:     if ($csec and defined($courseopt)) {
                   2478:         if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
                   2479:         if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
                   2480:         if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
                   2481:     }
                   2482: 
                   2483:     if (defined($courseopt)) {
                   2484:         if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
                   2485:         if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
                   2486:         if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
                   2487:     }
                   2488: 
                   2489: # ----------------------------------------------------- third, check map parms
                   2490: 
                   2491:     my $thisparm=$$parmhash{$symbparm};
                   2492:     if (defined($thisparm)) { return $thisparm; }
                   2493: 
                   2494: # ----------------------------------------------------- fourth , check default
                   2495: 
1.246     albertel 2496:     my $meta_rwhat=$rwhat;
                   2497:     $meta_rwhat=~s/\./_/g;
                   2498:     my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
                   2499:     if (defined($default)) { return $default}
                   2500:     $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.133     bowersj2 2501:     if (defined($default)) { return $default}
                   2502: 
                   2503: # --------------------------------------------------- fifth , cascade up parts
                   2504: 
                   2505:     my ($space,@qualifier)=split(/\./,$rwhat);
                   2506:     my $qualifier=join('.',@qualifier);
                   2507:     unless ($space eq '0') {
1.160     albertel 2508: 	my @parts=split(/_/,$space);
                   2509: 	my $id=pop(@parts);
                   2510: 	my $part=join('_',@parts);
                   2511: 	if ($part eq '') { $part='0'; }
1.219     albertel 2512: 	my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
1.160     albertel 2513: 	if (defined($partgeneral)) { return $partgeneral; }
1.133     bowersj2 2514:     }
1.219     albertel 2515:     if ($recurse) { return undef; }
                   2516:     my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
                   2517:     if (defined($pack_def)) { return $pack_def; }
1.133     bowersj2 2518:     return '';
1.145     bowersj2 2519: }
                   2520: 
1.174     albertel 2521: =pod
1.145     bowersj2 2522: 
1.174     albertel 2523: =item * B<getResourceByUrl>(url):
1.145     bowersj2 2524: 
1.174     albertel 2525: Retrieves a resource object by URL of the resource. If passed a
                   2526: resource object, it will simply return it, so it is safe to use this
                   2527: method in code like "$res = $navmap->getResourceByUrl($res)", if
                   2528: you're not sure if $res is already an object, or just a URL. If the
                   2529: resource appears multiple times in the course, only the first instance
                   2530: will be returned. As a result, this is probably useful only for maps.
                   2531: 
                   2532: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
                   2533: 
                   2534: The map is a specification of a map to retreive the resources from,
                   2535: either as a url or as an object. The filterFunc is a reference to a
                   2536: function that takes a resource object as its one argument and returns
                   2537: true if the resource should be included, or false if it should not
                   2538: be. If recursive is true, the map will be recursively examined,
                   2539: otherwise it will not be. If bailout is true, the function will return
                   2540: as soon as it finds a resource, if false it will finish. By default,
                   2541: the map is the top-level map of the course, filterFunc is a function
                   2542: that always returns 1, recursive is true, bailout is false. The
                   2543: resources will be returned in a list containing the resource objects
                   2544: for the corresponding resources, with B<no structure information> in
                   2545: the list; regardless of branching, recursion, etc., it will be a flat
                   2546: list.
                   2547: 
                   2548: Thus, this is suitable for cases where you don't want the structure,
                   2549: just a list of all resources. It is also suitable for finding out how
                   2550: many resources match a given description; for this use, if all you
                   2551: want to know is if I<any> resources match the description, the bailout
                   2552: parameter will allow you to avoid potentially expensive enumeration of
                   2553: all matching resources.
1.145     bowersj2 2554: 
1.256     albertel 2555: =item * B<hasResource>(map, filterFunc, recursive):
1.145     bowersj2 2556: 
1.174     albertel 2557: Convience method for
1.146     bowersj2 2558: 
                   2559:  scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
                   2560: 
1.174     albertel 2561: which will tell whether the map has resources matching the description
                   2562: in the filter function.
1.146     bowersj2 2563: 
1.145     bowersj2 2564: =cut
                   2565: 
1.277     matthew  2566: 
1.145     bowersj2 2567: sub getResourceByUrl {
                   2568:     my $self = shift;
                   2569:     my $resUrl = shift;
                   2570: 
                   2571:     if (ref($resUrl)) { return $resUrl; }
                   2572: 
                   2573:     $resUrl = &Apache::lonnet::clutter($resUrl);
                   2574:     my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
                   2575:     if ($resId =~ /,/) {
                   2576:         $resId = (split (/,/, $resId))[0];
                   2577:     }
                   2578:     if (!$resId) { return ''; }
                   2579:     return $self->getById($resId);
                   2580: }
                   2581: 
                   2582: sub retrieveResources {
                   2583:     my $self = shift;
                   2584:     my $map = shift;
                   2585:     my $filterFunc = shift;
                   2586:     if (!defined ($filterFunc)) {
                   2587:         $filterFunc = sub {return 1;};
                   2588:     }
                   2589:     my $recursive = shift;
                   2590:     if (!defined($recursive)) { $recursive = 1; }
                   2591:     my $bailout = shift;
                   2592:     if (!defined($bailout)) { $bailout = 0; }
                   2593: 
                   2594:     # Create the necessary iterator.
                   2595:     if (!ref($map)) { # assume it's a url of a map.
1.172     bowersj2 2596:         $map = $self->getResourceByUrl($map);
1.145     bowersj2 2597:     }
                   2598: 
1.213     bowersj2 2599:     # If nothing was passed, assume top-level map
                   2600:     if (!$map) {
                   2601: 	$map = $self->getById('0.0');
                   2602:     }
                   2603: 
1.145     bowersj2 2604:     # Check the map's validity.
1.213     bowersj2 2605:     if (!$map->is_map()) {
1.145     bowersj2 2606:         # Oh, to throw an exception.... how I'd love that!
                   2607:         return ();
                   2608:     }
                   2609: 
1.146     bowersj2 2610:     # Get an iterator.
                   2611:     my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.215     bowersj2 2612:                                 undef, $recursive);
1.146     bowersj2 2613: 
                   2614:     my @resources = ();
                   2615: 
                   2616:     # Run down the iterator and collect the resources.
1.222     bowersj2 2617:     my $curRes;
                   2618: 
                   2619:     while ($curRes = $it->next()) {
1.146     bowersj2 2620:         if (ref($curRes)) {
                   2621:             if (!&$filterFunc($curRes)) {
                   2622:                 next;
                   2623:             }
                   2624: 
                   2625:             push @resources, $curRes;
                   2626: 
                   2627:             if ($bailout) {
                   2628:                 return @resources;
                   2629:             }
                   2630:         }
                   2631: 
                   2632:     }
                   2633: 
                   2634:     return @resources;
                   2635: }
                   2636: 
                   2637: sub hasResource {
                   2638:     my $self = shift;
                   2639:     my $map = shift;
                   2640:     my $filterFunc = shift;
                   2641:     my $recursive = shift;
                   2642:     
                   2643:     return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133     bowersj2 2644: }
1.51      bowersj2 2645: 
                   2646: 1;
                   2647: 
                   2648: package Apache::lonnavmaps::iterator;
                   2649: 
                   2650: =pod
                   2651: 
                   2652: =back
                   2653: 
1.174     albertel 2654: =head1 Object: navmap Iterator
1.51      bowersj2 2655: 
1.174     albertel 2656: An I<iterator> encapsulates the logic required to traverse a data
                   2657: structure. navmap uses an iterator to traverse the course map
                   2658: according to the criteria you wish to use.
                   2659: 
                   2660: To obtain an iterator, call the B<getIterator>() function of a
                   2661: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
                   2662: directly.) This will return a reference to the iterator:
1.51      bowersj2 2663: 
                   2664: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   2665: 
                   2666: To get the next thing from the iterator, call B<next>:
                   2667: 
                   2668: C<my $nextThing = $resourceIterator-E<gt>next()>
                   2669: 
                   2670: getIterator behaves as follows:
                   2671: 
                   2672: =over 4
                   2673: 
1.174     albertel 2674: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
                   2675: 
                   2676: All parameters are optional. firstResource is a resource reference
                   2677: corresponding to where the iterator should start. It defaults to
                   2678: navmap->firstResource() for the corresponding nav map. finishResource
                   2679: corresponds to where you want the iterator to end, defaulting to
                   2680: navmap->finishResource(). filterHash is a hash used as a set
                   2681: containing strings representing the resource IDs, defaulting to
                   2682: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205     bowersj2 2683: hash: If a 0, then only resources that exist IN the filterHash will be
1.174     albertel 2684: recursed on. If it is a 1, only resources NOT in the filterHash will
                   2685: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
                   2686: false (default), the iterator will only return the first level of map
                   2687: that is not just a single, 'redirecting' map. If true, the iterator
                   2688: will return all information, starting with the top-level map,
                   2689: regardless of content. returnTopMap, if true (default false), will
                   2690: cause the iterator to return the top-level map object (resource 0.0)
                   2691: before anything else.
                   2692: 
                   2693: Thus, by default, only top-level resources will be shown. Change the
                   2694: condition to a 1 without changing the hash, and all resources will be
                   2695: shown. Changing the condition to 1 and including some values in the
                   2696: hash will allow you to selectively suppress parts of the navmap, while
                   2697: leaving it on 0 and adding things to the hash will allow you to
                   2698: selectively add parts of the nav map. See the handler code for
                   2699: examples.
                   2700: 
                   2701: The iterator will return either a reference to a resource object, or a
                   2702: token representing something in the map, such as the beginning of a
                   2703: new branch. The possible tokens are:
                   2704: 
                   2705: =over 4
1.51      bowersj2 2706: 
1.222     bowersj2 2707: =item * B<END_ITERATOR>:
                   2708: 
                   2709: The iterator has returned all that it's going to. Further calls to the
                   2710: iterator will just produce more of these. This is a "false" value, and
                   2711: is the only false value the iterator which will be returned, so it can
                   2712: be used as a loop sentinel.
                   2713: 
1.217     bowersj2 2714: =item * B<BEGIN_MAP>:
1.51      bowersj2 2715: 
1.174     albertel 2716: A new map is being recursed into. This is returned I<after> the map
                   2717: resource itself is returned.
1.51      bowersj2 2718: 
1.217     bowersj2 2719: =item * B<END_MAP>:
1.174     albertel 2720: 
                   2721: The map is now done.
1.51      bowersj2 2722: 
1.217     bowersj2 2723: =item * B<BEGIN_BRANCH>:
1.70      bowersj2 2724: 
1.174     albertel 2725: A branch is now starting. The next resource returned will be the first
                   2726: in that branch.
1.70      bowersj2 2727: 
1.217     bowersj2 2728: =item * B<END_BRANCH>:
1.70      bowersj2 2729: 
1.174     albertel 2730: The branch is now done.
1.51      bowersj2 2731: 
                   2732: =back
                   2733: 
1.174     albertel 2734: The tokens are retreivable via methods on the iterator object, i.e.,
                   2735: $iterator->END_MAP.
1.70      bowersj2 2736: 
1.174     albertel 2737: Maps can contain empty resources. The iterator will automatically skip
                   2738: over such resources, but will still treat the structure
                   2739: correctly. Thus, a complicated map with several branches, but
                   2740: consisting entirely of empty resources except for one beginning or
                   2741: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
                   2742: but only one resource will be returned.
1.116     bowersj2 2743: 
1.242     matthew  2744: =back
                   2745: 
1.222     bowersj2 2746: =head2 Normal Usage
                   2747: 
                   2748: Normal usage of the iterator object is to do the following:
                   2749: 
                   2750:  my $it = $navmap->getIterator([your params here]);
                   2751:  my $curRes;
                   2752:  while ($curRes = $it->next()) {
                   2753:    [your logic here]
                   2754:  }
                   2755: 
                   2756: Note that inside of the loop, it's frequently useful to check if
                   2757: "$curRes" is a reference or not with the reference function; only
                   2758: resource objects will be references, and any non-references will 
                   2759: be the tokens described above.
                   2760: 
                   2761: Also note there is some old code floating around that trys to track
                   2762: the depth of the iterator to see when it's done; do not copy that 
                   2763: code. It is difficult to get right and harder to understand then
                   2764: this. They should be migrated to this new style.
1.51      bowersj2 2765: 
                   2766: =cut
                   2767: 
                   2768: # Here are the tokens for the iterator:
                   2769: 
1.222     bowersj2 2770: sub END_ITERATOR { return 0; }
1.51      bowersj2 2771: sub BEGIN_MAP { return 1; }    # begining of a new map
                   2772: sub END_MAP { return 2; }      # end of the map
                   2773: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   2774: sub END_BRANCH { return 4; }   # end of a branch
1.89      bowersj2 2775: sub FORWARD { return 1; }      # go forward
                   2776: sub BACKWARD { return 2; }
1.51      bowersj2 2777: 
1.96      bowersj2 2778: sub min {
                   2779:     (my $a, my $b) = @_;
                   2780:     if ($a < $b) { return $a; } else { return $b; }
                   2781: }
                   2782: 
1.94      bowersj2 2783: sub new {
                   2784:     # magic invocation to create a class instance
                   2785:     my $proto = shift;
                   2786:     my $class = ref($proto) || $proto;
                   2787:     my $self = {};
                   2788: 
                   2789:     $self->{NAV_MAP} = shift;
                   2790:     return undef unless ($self->{NAV_MAP});
                   2791: 
                   2792:     # Handle the parameters
                   2793:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   2794:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   2795: 
                   2796:     # If the given resources are just the ID of the resource, get the
                   2797:     # objects
                   2798:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   2799:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   2800:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   2801:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   2802: 
                   2803:     $self->{FILTER} = shift;
                   2804: 
                   2805:     # A hash, used as a set, of resource already seen
                   2806:     $self->{ALREADY_SEEN} = shift;
                   2807:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   2808:     $self->{CONDITION} = shift;
                   2809: 
1.116     bowersj2 2810:     # Do we want to automatically follow "redirection" maps?
                   2811:     $self->{FORCE_TOP} = shift;
                   2812: 
1.162     bowersj2 2813:     # Do we want to return the top-level map object (resource 0.0)?
                   2814:     $self->{RETURN_0} = shift;
                   2815:     # have we done that yet?
                   2816:     $self->{HAVE_RETURNED_0} = 0;
                   2817: 
1.94      bowersj2 2818:     # Now, we need to pre-process the map, by walking forward and backward
                   2819:     # over the parts of the map we're going to look at.
1.96      bowersj2 2820: 
1.97      bowersj2 2821:     # The processing steps are exactly the same, except for a few small 
                   2822:     # changes, so I bundle those up in the following list of two elements:
                   2823:     # (direction_to_iterate, VAL_name, next_resource_method_to_call,
                   2824:     # first_resource).
                   2825:     # This prevents writing nearly-identical code twice.
                   2826:     my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                   2827:                         'FIRST_RESOURCE'],
                   2828:                        [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                   2829:                         'FINISH_RESOURCE'] );
                   2830: 
1.98      bowersj2 2831:     my $maxDepth = 0; # tracks max depth
                   2832: 
1.116     bowersj2 2833:     # If there is only one resource in this map, and it's a map, we
                   2834:     # want to remember that, so the user can ask for the first map
                   2835:     # that isn't just a redirector.
                   2836:     my $resource; my $resourceCount = 0;
                   2837: 
1.209     bowersj2 2838:     # Documentation on this algorithm can be found in the CVS repository at 
                   2839:     # /docs/lonnavdocs; these "**#**" markers correspond to documentation
                   2840:     # in that file.
1.107     bowersj2 2841:     # **1**
                   2842: 
1.97      bowersj2 2843:     foreach my $pass (@iterations) {
                   2844:         my $direction = $pass->[0];
                   2845:         my $valName = $pass->[1];
                   2846:         my $nextResourceMethod = $pass->[2];
                   2847:         my $firstResourceName = $pass->[3];
                   2848: 
                   2849:         my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                   2850:                                                             $self->{FIRST_RESOURCE},
                   2851:                                                             $self->{FINISH_RESOURCE},
                   2852:                                                             {}, undef, 0, $direction);
1.96      bowersj2 2853:     
1.97      bowersj2 2854:         # prime the recursion
                   2855:         $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222     bowersj2 2856: 	$iterator->next();
1.97      bowersj2 2857:         my $curRes = $iterator->next();
1.222     bowersj2 2858: 	my $depth = 1;
                   2859:         while ($depth > 0) {
                   2860: 	    if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
                   2861: 	    if ($curRes == $iterator->END_MAP()) { $depth--; }
                   2862: 
1.97      bowersj2 2863:             if (ref($curRes)) {
1.116     bowersj2 2864:                 # If there's only one resource, this will save it
1.117     bowersj2 2865:                 # we have to filter empty resources from consideration here,
                   2866:                 # or even "empty", redirecting maps have two (start & finish)
                   2867:                 # or three (start, finish, plus redirector)
                   2868:                 if($direction == FORWARD && $curRes->src()) { 
                   2869:                     $resource = $curRes; $resourceCount++; 
                   2870:                 }
1.97      bowersj2 2871:                 my $resultingVal = $curRes->{DATA}->{$valName};
                   2872:                 my $nextResources = $curRes->$nextResourceMethod();
1.116     bowersj2 2873:                 my $nextCount = scalar(@{$nextResources});
1.104     bowersj2 2874: 
1.116     bowersj2 2875:                 if ($nextCount == 1) { # **3**
1.97      bowersj2 2876:                     my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                   2877:                     $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   2878:                 }
                   2879:                 
1.116     bowersj2 2880:                 if ($nextCount > 1) { # **4**
1.97      bowersj2 2881:                     foreach my $res (@{$nextResources}) {
                   2882:                         my $current = $res->{DATA}->{$valName} || 999999999;
                   2883:                         $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                   2884:                     }
                   2885:                 }
                   2886:             }
1.96      bowersj2 2887:             
1.107     bowersj2 2888:             # Assign the final val (**2**)
1.97      bowersj2 2889:             if (ref($curRes) && $direction == BACKWARD()) {
1.98      bowersj2 2890:                 my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
                   2891:                                      $curRes->{DATA}->{BOT_UP_VAL});
                   2892:                 
                   2893:                 $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                   2894:                 if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190     bowersj2 2895:             }
1.222     bowersj2 2896: 
                   2897: 	    $curRes = $iterator->next();
1.96      bowersj2 2898:         }
                   2899:     }
1.94      bowersj2 2900: 
1.116     bowersj2 2901:     # Check: Was this only one resource, a map?
1.255     albertel 2902:     if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) { 
1.116     bowersj2 2903:         my $firstResource = $resource->map_start();
                   2904:         my $finishResource = $resource->map_finish();
                   2905:         return 
                   2906:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   2907:                                               $finishResource, $self->{FILTER},
                   2908:                                               $self->{ALREADY_SEEN}, 
                   2909:                                               $self->{CONDITION}, 0);
                   2910:         
                   2911:     }
                   2912: 
1.98      bowersj2 2913:     # Set up some bookkeeping information.
                   2914:     $self->{CURRENT_DEPTH} = 0;
                   2915:     $self->{MAX_DEPTH} = $maxDepth;
                   2916:     $self->{STACK} = [];
                   2917:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222     bowersj2 2918:     $self->{FINISHED} = 0; # When true, the iterator has finished
1.98      bowersj2 2919: 
                   2920:     for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
                   2921:         push @{$self->{STACK}}, [];
                   2922:     }
                   2923: 
1.107     bowersj2 2924:     # Prime the recursion w/ the first resource **5**
1.98      bowersj2 2925:     push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
                   2926:     $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
                   2927: 
                   2928:     bless ($self);
                   2929: 
                   2930:     return $self;
                   2931: }
                   2932: 
                   2933: sub next {
                   2934:     my $self = shift;
1.256     albertel 2935:     my $closeAllPages=shift;
1.222     bowersj2 2936:     if ($self->{FINISHED}) {
                   2937: 	return END_ITERATOR();
                   2938:     }
                   2939: 
1.162     bowersj2 2940:     # If we want to return the top-level map object, and haven't yet,
                   2941:     # do so.
                   2942:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
                   2943:         $self->{HAVE_RETURNED_0} = 1;
                   2944:         return $self->{NAV_MAP}->getById('0.0');
                   2945:     }
1.98      bowersj2 2946: 
                   2947:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   2948:         # grab the next from the recursive iterator 
1.256     albertel 2949:         my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
1.98      bowersj2 2950: 
                   2951:         # is it a begin or end map? If so, update the depth
                   2952:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   2953:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   2954: 
                   2955:         # Are we back at depth 0? If so, stop recursing
                   2956:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   2957:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   2958:         }
                   2959: 
                   2960:         return $next;
                   2961:     }
                   2962: 
                   2963:     if (defined($self->{FORCE_NEXT})) {
                   2964:         my $tmp = $self->{FORCE_NEXT};
                   2965:         $self->{FORCE_NEXT} = undef;
                   2966:         return $tmp;
                   2967:     }
                   2968: 
                   2969:     # Have we not yet begun? If not, return BEGIN_MAP and
                   2970:     # remember we've started.
                   2971:     if ( !$self->{STARTED} ) { 
                   2972:         $self->{STARTED} = 1;
                   2973:         return $self->BEGIN_MAP();
                   2974:     }
                   2975: 
                   2976:     # Here's the guts of the iterator.
                   2977:     
                   2978:     # Find the next resource, if any.
                   2979:     my $found = 0;
                   2980:     my $i = $self->{MAX_DEPTH};
                   2981:     my $newDepth;
                   2982:     my $here;
                   2983:     while ( $i >= 0 && !$found ) {
1.107     bowersj2 2984:         if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
                   2985:             $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98      bowersj2 2986:             $found = 1;
                   2987:             $newDepth = $i;
                   2988:         }
                   2989:         $i--;
                   2990:     }
                   2991: 
                   2992:     # If we still didn't find anything, we're done.
                   2993:     if ( !$found ) {
                   2994:         # We need to get back down to the correct branch depth
                   2995:         if ( $self->{CURRENT_DEPTH} > 0 ) {
                   2996:             $self->{CURRENT_DEPTH}--;
                   2997:             return END_BRANCH();
                   2998:         } else {
1.222     bowersj2 2999: 	    $self->{FINISHED} = 1;
1.98      bowersj2 3000:             return END_MAP();
                   3001:         }
                   3002:     }
                   3003: 
1.104     bowersj2 3004:     # If this is not a resource, it must be an END_BRANCH marker we want
                   3005:     # to return directly.
1.107     bowersj2 3006:     if (!ref($here)) { # **8**
1.104     bowersj2 3007:         if ($here == END_BRANCH()) { # paranoia, in case of later extension
                   3008:             $self->{CURRENT_DEPTH}--;
                   3009:             return $here;
                   3010:         }
                   3011:     }
                   3012: 
                   3013:     # Otherwise, it is a resource and it's safe to store in $self->{HERE}
                   3014:     $self->{HERE} = $here;
                   3015: 
1.98      bowersj2 3016:     # Get to the right level
                   3017:     if ( $self->{CURRENT_DEPTH} > $newDepth ) {
                   3018:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3019:         $self->{CURRENT_DEPTH}--;
                   3020:         return END_BRANCH();
                   3021:     }
                   3022:     if ( $self->{CURRENT_DEPTH} < $newDepth) {
                   3023:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3024:         $self->{CURRENT_DEPTH}++;
                   3025:         return BEGIN_BRANCH();
                   3026:     }
                   3027: 
                   3028:     # If we made it here, we have the next resource, and we're at the
                   3029:     # right branch level. So let's examine the resource for where
                   3030:     # we can get to from here.
                   3031: 
                   3032:     # So we need to look at all the resources we can get to from here,
                   3033:     # categorize them if we haven't seen them, remember if we have a new
                   3034:     my $nextUnfiltered = $here->getNext();
1.104     bowersj2 3035:     my $maxDepthAdded = -1;
                   3036:     
1.98      bowersj2 3037:     for (@$nextUnfiltered) {
                   3038:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104     bowersj2 3039:             my $depth = $_->{DATA}->{DISPLAY_DEPTH};
                   3040:             push @{$self->{STACK}->[$depth]}, $_;
1.98      bowersj2 3041:             $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104     bowersj2 3042:             if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98      bowersj2 3043:         }
                   3044:     }
1.104     bowersj2 3045: 
                   3046:     # Is this the end of a branch? If so, all of the resources examined above
                   3047:     # led to lower levels then the one we are currently at, so we push a END_BRANCH
                   3048:     # marker onto the stack so we don't forget.
                   3049:     # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
                   3050:     # BC branch and gets to C, it will see F as the only next resource, but it's
                   3051:     # one level lower. Thus, this is the end of the branch, since there are no
                   3052:     # more resources added to this level or above.
1.111     bowersj2 3053:     # We don't do this if the examined resource is the finish resource,
                   3054:     # because the condition given above is true, but the "END_MAP" will
                   3055:     # take care of things and we should already be at depth 0.
1.104     bowersj2 3056:     my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111     bowersj2 3057:     if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104     bowersj2 3058:         push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
                   3059:     }
                   3060: 
1.98      bowersj2 3061:     # That ends the main iterator logic. Now, do we want to recurse
                   3062:     # down this map (if this resource is a map)?
1.256     albertel 3063:     if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
1.98      bowersj2 3064:         (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
                   3065:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3066:         my $firstResource = $self->{HERE}->map_start();
                   3067:         my $finishResource = $self->{HERE}->map_finish();
                   3068: 
                   3069:         $self->{RECURSIVE_ITERATOR} = 
                   3070:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   3071:                                               $finishResource, $self->{FILTER},
                   3072:                                               $self->{ALREADY_SEEN}, $self->{CONDITION});
                   3073:     }
                   3074: 
1.116     bowersj2 3075:     # If this is a blank resource, don't actually return it.
1.117     bowersj2 3076:     # Should you ever find you need it, make sure to add an option to the code
                   3077:     #  that you can use; other things depend on this behavior.
1.138     bowersj2 3078:     my $browsePriv = $self->{HERE}->browsePriv();
                   3079:     if (!$self->{HERE}->src() || 
                   3080:         (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.256     albertel 3081:         return $self->next($closeAllPages);
1.116     bowersj2 3082:     }
                   3083: 
1.98      bowersj2 3084:     return $self->{HERE};
                   3085: 
                   3086: }
                   3087: 
                   3088: =pod
                   3089: 
1.174     albertel 3090: The other method available on the iterator is B<getStack>, which
                   3091: returns an array populated with the current 'stack' of maps, as
                   3092: references to the resource objects. Example: This is useful when
                   3093: making the navigation map, as we need to check whether we are under a
                   3094: page map to see if we need to link directly to the resource, or to the
                   3095: page. The first elements in the array will correspond to the top of
                   3096: the stack (most inclusive map).
1.98      bowersj2 3097: 
                   3098: =cut
                   3099: 
                   3100: sub getStack {
                   3101:     my $self=shift;
                   3102: 
                   3103:     my @stack;
                   3104: 
                   3105:     $self->populateStack(\@stack);
                   3106: 
                   3107:     return \@stack;
                   3108: }
                   3109: 
                   3110: # Private method: Calls the iterators recursively to populate the stack.
                   3111: sub populateStack {
                   3112:     my $self=shift;
                   3113:     my $stack = shift;
                   3114: 
                   3115:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3116: 
                   3117:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3118:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3119:     }
1.94      bowersj2 3120: }
                   3121: 
                   3122: 1;
                   3123: 
                   3124: package Apache::lonnavmaps::DFSiterator;
                   3125: 
1.100     bowersj2 3126: # Not documented in the perldoc: This is a simple iterator that just walks
                   3127: #  through the nav map and presents the resources in a depth-first search
                   3128: #  fashion, ignorant of conditionals, randomized resources, etc. It presents
                   3129: #  BEGIN_MAP and END_MAP, but does not understand branches at all. It is
                   3130: #  useful for pre-processing of some kind, and is in fact used by the main
                   3131: #  iterator that way, but that's about it.
                   3132: # One could imagine merging this into the init routine of the main iterator,
1.251     www      3133: #  but this might as well be left separate, since it is possible some other
1.100     bowersj2 3134: #  use might be found for it. - Jeremy
1.94      bowersj2 3135: 
1.117     bowersj2 3136: # Unlike the main iterator, this DOES return all resources, even blank ones.
                   3137: #  The main iterator needs them to correctly preprocess the map.
                   3138: 
1.94      bowersj2 3139: sub BEGIN_MAP { return 1; }    # begining of a new map
                   3140: sub END_MAP { return 2; }      # end of the map
                   3141: sub FORWARD { return 1; }      # go forward
                   3142: sub BACKWARD { return 2; }
                   3143: 
1.100     bowersj2 3144: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
                   3145: #         filter hash ref (or undef), already seen hash or undef, condition
                   3146: #         (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51      bowersj2 3147: sub new {
                   3148:     # magic invocation to create a class instance
                   3149:     my $proto = shift;
                   3150:     my $class = ref($proto) || $proto;
                   3151:     my $self = {};
                   3152: 
                   3153:     $self->{NAV_MAP} = shift;
                   3154:     return undef unless ($self->{NAV_MAP});
                   3155: 
                   3156:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   3157:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   3158: 
                   3159:     # If the given resources are just the ID of the resource, get the
                   3160:     # objects
                   3161:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   3162:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   3163:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   3164:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   3165: 
                   3166:     $self->{FILTER} = shift;
                   3167: 
                   3168:     # A hash, used as a set, of resource already seen
                   3169:     $self->{ALREADY_SEEN} = shift;
1.140     bowersj2 3170:      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63      bowersj2 3171:     $self->{CONDITION} = shift;
1.89      bowersj2 3172:     $self->{DIRECTION} = shift || FORWARD();
1.51      bowersj2 3173: 
1.100     bowersj2 3174:     # Flag: Have we started yet?
1.51      bowersj2 3175:     $self->{STARTED} = 0;
                   3176: 
                   3177:     # Should we continue calling the recursive iterator, if any?
                   3178:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3179:     # The recursive iterator, if any
                   3180:     $self->{RECURSIVE_ITERATOR} = undef;
                   3181:     # Are we recursing on a map, or a branch?
                   3182:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   3183:     # And the count of how deep it is, so that this iterator can keep track of
                   3184:     # when to pick back up again.
                   3185:     $self->{RECURSIVE_DEPTH} = 0;
                   3186: 
                   3187:     # For keeping track of our branches, we maintain our own stack
1.100     bowersj2 3188:     $self->{STACK} = [];
1.51      bowersj2 3189: 
                   3190:     # Start with the first resource
1.89      bowersj2 3191:     if ($self->{DIRECTION} == FORWARD) {
1.100     bowersj2 3192:         push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89      bowersj2 3193:     } else {
1.100     bowersj2 3194:         push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89      bowersj2 3195:     }
1.51      bowersj2 3196: 
                   3197:     bless($self);
                   3198:     return $self;
                   3199: }
                   3200: 
                   3201: sub next {
                   3202:     my $self = shift;
                   3203:     
                   3204:     # Are we using a recursive iterator? If so, pull from that and
                   3205:     # watch the depth; we want to resume our level at the correct time.
1.98      bowersj2 3206:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51      bowersj2 3207:         # grab the next from the recursive iterator
                   3208:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   3209:         
                   3210:         # is it a begin or end map? Update depth if so
                   3211:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3212:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3213: 
                   3214:         # Are we back at depth 0? If so, stop recursing.
                   3215:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3216:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3217:         }
                   3218:         
                   3219:         return $next;
                   3220:     }
                   3221: 
                   3222:     # Is there a current resource to grab? If not, then return
1.100     bowersj2 3223:     # END_MAP, which will end the iterator.
                   3224:     if (scalar(@{$self->{STACK}}) == 0) {
                   3225:         return $self->END_MAP();
1.51      bowersj2 3226:     }
                   3227: 
                   3228:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   3229:     # remember that we've started.
                   3230:     if ( !$self->{STARTED} ) {
                   3231:         $self->{STARTED} = 1;
                   3232:         return $self->BEGIN_MAP;
                   3233:     }
                   3234: 
                   3235:     # Get the next resource in the branch
1.100     bowersj2 3236:     $self->{HERE} = pop @{$self->{STACK}};
1.52      bowersj2 3237: 
1.100     bowersj2 3238:     # remember that we've seen this, so we don't return it again later
1.51      bowersj2 3239:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   3240:     
                   3241:     # Get the next possible resources
1.90      bowersj2 3242:     my $nextUnfiltered;
1.89      bowersj2 3243:     if ($self->{DIRECTION} == FORWARD()) {
1.90      bowersj2 3244:         $nextUnfiltered = $self->{HERE}->getNext();
1.89      bowersj2 3245:     } else {
1.90      bowersj2 3246:         $nextUnfiltered = $self->{HERE}->getPrevious();
1.89      bowersj2 3247:     }
1.51      bowersj2 3248:     my $next = [];
                   3249: 
                   3250:     # filter the next possibilities to remove things we've 
1.100     bowersj2 3251:     # already seen.
1.51      bowersj2 3252:     foreach (@$nextUnfiltered) {
1.52      bowersj2 3253:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
                   3254:             push @$next, $_;
                   3255:         }
1.51      bowersj2 3256:     }
                   3257: 
                   3258:     while (@$next) {
1.100     bowersj2 3259:         # copy the next possibilities over to the stack
                   3260:         push @{$self->{STACK}}, shift @$next;
1.51      bowersj2 3261:     }
                   3262: 
                   3263:     # If this is a map and we want to recurse down it... (not filtered out)
1.70      bowersj2 3264:     if ($self->{HERE}->is_map() && 
1.63      bowersj2 3265:          (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { 
1.51      bowersj2 3266:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3267:         my $firstResource = $self->{HERE}->map_start();
                   3268:         my $finishResource = $self->{HERE}->map_finish();
                   3269: 
                   3270:         $self->{RECURSIVE_ITERATOR} =
1.94      bowersj2 3271:           Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
1.63      bowersj2 3272:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91      bowersj2 3273:                                              $self->{CONDITION}, $self->{DIRECTION});
1.51      bowersj2 3274:     }
                   3275: 
                   3276:     return $self->{HERE};
1.190     bowersj2 3277: }
                   3278: 
                   3279: # Identical to the full iterator methods of the same name. Hate to copy/paste
                   3280: # but I also hate to "inherit" either iterator from the other.
                   3281: 
                   3282: sub getStack {
                   3283:     my $self=shift;
                   3284: 
                   3285:     my @stack;
                   3286: 
                   3287:     $self->populateStack(\@stack);
                   3288: 
                   3289:     return \@stack;
                   3290: }
                   3291: 
                   3292: # Private method: Calls the iterators recursively to populate the stack.
                   3293: sub populateStack {
                   3294:     my $self=shift;
                   3295:     my $stack = shift;
                   3296: 
                   3297:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3298: 
                   3299:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3300:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3301:     }
1.51      bowersj2 3302: }
                   3303: 
1.1       www      3304: 1;
1.2       www      3305: 
1.51      bowersj2 3306: package Apache::lonnavmaps::resource;
                   3307: 
                   3308: use Apache::lonnet;
                   3309: 
                   3310: =pod
                   3311: 
1.217     bowersj2 3312: =head1 Object: resource 
1.51      bowersj2 3313: 
1.217     bowersj2 3314: X<resource, navmap object>
1.174     albertel 3315: A resource object encapsulates a resource in a resource map, allowing
                   3316: easy manipulation of the resource, querying the properties of the
                   3317: resource (including user properties), and represents a reference that
                   3318: can be used as the canonical representation of the resource by
                   3319: lonnavmap clients like renderers.
                   3320: 
                   3321: A resource only makes sense in the context of a navmap, as some of the
                   3322: data is stored in the navmap object.
                   3323: 
                   3324: You will probably never need to instantiate this object directly. Use
                   3325: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
                   3326: starting resource.
1.51      bowersj2 3327: 
1.188     bowersj2 3328: Resource objects respect the parameter_hiddenparts, which suppresses 
                   3329: various parts according to the wishes of the map author. As of this
                   3330: writing, there is no way to override this parameter, and suppressed
                   3331: parts will never be returned, nor will their response types or ids be
                   3332: stored.
                   3333: 
1.217     bowersj2 3334: =head2 Overview
1.51      bowersj2 3335: 
1.217     bowersj2 3336: A B<Resource> is the most granular type of object in LON-CAPA that can
                   3337: be included in a course. It can either be a particular resource, like
                   3338: an HTML page, external resource, problem, etc., or it can be a
                   3339: container sequence, such as a "page" or a "map".
                   3340: 
                   3341: To see a sequence from the user's point of view, please see the
                   3342: B<Creating a Course: Maps and Sequences> chapter of the Author's
                   3343: Manual.
                   3344: 
                   3345: A Resource Object, once obtained from a navmap object via a B<getBy*>
                   3346: method of the navmap, or from an iterator, allows you to query
                   3347: information about that resource.
                   3348: 
                   3349: Generally, you do not ever want to create a resource object yourself,
                   3350: so creation has been left undocumented. Always retrieve resources
                   3351: from navmap objects.
                   3352: 
                   3353: =head3 Identifying Resources
                   3354: 
                   3355: X<big hash>Every resource is identified by a Resource ID in the big hash that is
                   3356: unique to that resource for a given course. X<resource ID, in big hash>
                   3357: The Resource ID has the form #.#, where the first number is the same
                   3358: for every resource in a map, and the second is unique. For instance,
                   3359: for a course laid out like this:
                   3360: 
                   3361:  * Problem 1
                   3362:  * Map
                   3363:    * Resource 2
                   3364:    * Resource 3
                   3365: 
                   3366: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
                   3367: C<Resource 3> will share a first number. The second number may end up
                   3368: re-used between the two groups.
                   3369: 
                   3370: The resource ID is only used in the big hash, but can be used in the
                   3371: context of a course to identify a resource easily. (For instance, the
                   3372: printing system uses it to record which resources from a sequence you 
                   3373: wish to print.)
                   3374: 
                   3375: X<symb> X<resource, symb>
                   3376: All resources also have B<symb>s, which uniquely identify a resource
                   3377: in a course. Many internal LON-CAPA functions expect a symb. A symb
                   3378: carries along with it the URL of the resource, and the map it appears
                   3379: in. Symbs are much larger then resource IDs.
1.51      bowersj2 3380: 
                   3381: =cut
                   3382: 
                   3383: sub new {
                   3384:     # magic invocation to create a class instance
                   3385:     my $proto = shift;
                   3386:     my $class = ref($proto) || $proto;
                   3387:     my $self = {};
                   3388: 
                   3389:     $self->{NAV_MAP} = shift;
                   3390:     $self->{ID} = shift;
                   3391: 
                   3392:     # Store this new resource in the parent nav map's cache.
                   3393:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66      bowersj2 3394:     $self->{RESOURCE_ERROR} = 0;
1.51      bowersj2 3395: 
                   3396:     # A hash that can be used by two-pass algorithms to store data
                   3397:     # about this resource in. Not used by the resource object
                   3398:     # directly.
                   3399:     $self->{DATA} = {};
                   3400:    
                   3401:     bless($self);
                   3402:     
                   3403:     return $self;
                   3404: }
                   3405: 
1.70      bowersj2 3406: # private function: simplify the NAV_HASH lookups we keep doing
                   3407: # pass the name, and to automatically append my ID, pass a true val on the
                   3408: # second param
                   3409: sub navHash {
                   3410:     my $self = shift;
                   3411:     my $param = shift;
                   3412:     my $id = shift;
1.115     bowersj2 3413:     return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70      bowersj2 3414: }
                   3415: 
1.51      bowersj2 3416: =pod
                   3417: 
1.217     bowersj2 3418: =head2 Methods
1.70      bowersj2 3419: 
1.217     bowersj2 3420: Once you have a resource object, here's what you can do with it:
                   3421: 
                   3422: =head3 Attribute Retrieval
                   3423: 
                   3424: Every resource has certain attributes that can be retrieved and used:
1.70      bowersj2 3425: 
                   3426: =over 4
                   3427: 
1.217     bowersj2 3428: =item * B<ID>: Every resource has an ID that is unique for that
                   3429:     resource in the course it is in. The ID is actually in the hash
                   3430:     representing the resource, so for a resource object $res, obtain
                   3431:     it via C<$res->{ID}).
                   3432: 
1.174     albertel 3433: =item * B<compTitle>:
                   3434: 
                   3435: Returns a "composite title", that is equal to $res->title() if the
                   3436: resource has a title, and is otherwise the last part of the URL (e.g.,
                   3437: "problem.problem").
                   3438: 
                   3439: =item * B<ext>:
                   3440: 
                   3441: Returns true if the resource is external.
                   3442: 
                   3443: =item * B<kind>:
                   3444: 
                   3445: Returns the kind of the resource from the compiled nav map.
                   3446: 
                   3447: =item * B<randomout>:
1.106     bowersj2 3448: 
1.174     albertel 3449: Returns true if this resource was chosen to NOT be shown to the user
                   3450: by the random map selection feature. In other words, this is usually
                   3451: false.
1.70      bowersj2 3452: 
1.174     albertel 3453: =item * B<randompick>:
1.70      bowersj2 3454: 
1.174     albertel 3455: Returns true for a map if the randompick feature is being used on the
                   3456: map. (?)
1.70      bowersj2 3457: 
1.174     albertel 3458: =item * B<src>:
1.51      bowersj2 3459: 
1.174     albertel 3460: Returns the source for the resource.
1.70      bowersj2 3461: 
1.174     albertel 3462: =item * B<symb>:
1.70      bowersj2 3463: 
1.174     albertel 3464: Returns the symb for the resource.
1.70      bowersj2 3465: 
1.174     albertel 3466: =item * B<title>:
1.70      bowersj2 3467: 
1.174     albertel 3468: Returns the title of the resource.
                   3469: 
1.51      bowersj2 3470: =back
                   3471: 
                   3472: =cut
                   3473: 
                   3474: # These info functions can be used directly, as they don't return
                   3475: # resource information.
1.85      bowersj2 3476: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70      bowersj2 3477: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85      bowersj2 3478: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217     bowersj2 3479: # considered private and undocumented
1.51      bowersj2 3480: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   3481: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68      bowersj2 3482: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
                   3483: sub randompick { 
                   3484:     my $self = shift;
                   3485:     return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
                   3486:                                                '.0.parameter_randompick'};
                   3487: }
1.51      bowersj2 3488: sub src { 
                   3489:     my $self=shift;
                   3490:     return $self->navHash("src_", 1);
                   3491: }
                   3492: sub symb {
                   3493:     my $self=shift;
                   3494:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3495:     my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223     albertel 3496:     my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
1.51      bowersj2 3497:         . '___' . $second . '___' . $symbSrc;
1.223     albertel 3498:     return &Apache::lonnet::symbclean($symb);
1.51      bowersj2 3499: }
1.213     bowersj2 3500: sub title { 
                   3501:     my $self=shift; 
                   3502:     if ($self->{ID} eq '0.0') {
                   3503: 	# If this is the top-level map, return the title of the course
                   3504: 	# since this map can not be titled otherwise.
                   3505: 	return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
                   3506:     }
                   3507:     return $self->navHash("title_", 1); }
1.217     bowersj2 3508: # considered private and undocumented
1.70      bowersj2 3509: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106     bowersj2 3510: sub compTitle {
                   3511:     my $self = shift;
                   3512:     my $title = $self->title();
1.176     www      3513:     $title=~s/\&colon\;/\:/gs;
1.106     bowersj2 3514:     if (!$title) {
                   3515:         $title = $self->src();
                   3516:         $title = substr($title, rindex($title, '/') + 1);
                   3517:     }
                   3518:     return $title;
                   3519: }
1.70      bowersj2 3520: =pod
                   3521: 
                   3522: B<Predicate Testing the Resource>
                   3523: 
                   3524: These methods are shortcuts to deciding if a given resource has a given property.
                   3525: 
                   3526: =over 4
                   3527: 
1.174     albertel 3528: =item * B<is_map>:
                   3529: 
                   3530: Returns true if the resource is a map type.
                   3531: 
                   3532: =item * B<is_problem>:
1.70      bowersj2 3533: 
1.174     albertel 3534: Returns true if the resource is a problem type, false
                   3535: otherwise. (Looks at the extension on the src field; might need more
                   3536: to work correctly.)
1.70      bowersj2 3537: 
1.174     albertel 3538: =item * B<is_page>:
1.70      bowersj2 3539: 
1.174     albertel 3540: Returns true if the resource is a page.
                   3541: 
                   3542: =item * B<is_sequence>:
                   3543: 
                   3544: Returns true if the resource is a sequence.
1.70      bowersj2 3545: 
                   3546: =back
                   3547: 
                   3548: =cut
                   3549: 
1.256     albertel 3550: sub hasResource {
                   3551:    my $self = shift;
                   3552:    return $self->{NAV_MAP}->hasResource(@_);
                   3553: }
                   3554: 
                   3555: sub retrieveResources {
                   3556:    my $self = shift;
                   3557:    return $self->{NAV_MAP}->retrieveResources(@_);
                   3558: }
1.70      bowersj2 3559: 
                   3560: sub is_html {
1.51      bowersj2 3561:     my $self=shift;
                   3562:     my $src = $self->src();
1.70      bowersj2 3563:     return ($src =~ /html$/);
1.51      bowersj2 3564: }
1.70      bowersj2 3565: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   3566: sub is_page {
1.51      bowersj2 3567:     my $self=shift;
                   3568:     my $src = $self->src();
1.205     bowersj2 3569:     return $self->navHash("is_map_", 1) && 
                   3570: 	$self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51      bowersj2 3571: }
1.70      bowersj2 3572: sub is_problem {
1.51      bowersj2 3573:     my $self=shift;
                   3574:     my $src = $self->src();
1.256     albertel 3575:     return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
                   3576: }
                   3577: sub contains_problem {
                   3578:     my $self=shift;
                   3579:     if ($self->is_page()) {
                   3580: 	my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3581: 	return $hasProblem;
                   3582:     }
                   3583:     return 0;
1.51      bowersj2 3584: }
1.70      bowersj2 3585: sub is_sequence {
1.51      bowersj2 3586:     my $self=shift;
                   3587:     my $src = $self->src();
1.205     bowersj2 3588:     return $self->navHash("is_map_", 1) && 
                   3589: 	$self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51      bowersj2 3590: }
1.261     matthew  3591: sub is_survey {
                   3592:     my $self = shift();
                   3593:     my $part = shift();
1.263     albertel 3594:     if ($self->parmval('type',$part) eq 'survey') {
1.261     matthew  3595:         return 1;
                   3596:     }
1.263     albertel 3597:     if ($self->src() =~ /\.(survey)$/) {
1.261     matthew  3598:         return 1;
                   3599:     }
                   3600:     return 0;
                   3601: }
1.51      bowersj2 3602: 
1.266     raeburn  3603: sub is_empty_sequence {
                   3604:     my $self=shift;
                   3605:     my $src = $self->src();
                   3606:     return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
                   3607: }
                   3608: 
1.101     bowersj2 3609: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51      bowersj2 3610: sub parmval {
                   3611:     my $self = shift;
                   3612:     my $what = shift;
1.185     bowersj2 3613:     my $part = shift;
                   3614:     if (!defined($part)) { 
                   3615:         $part = '0'; 
                   3616:     }
1.51      bowersj2 3617:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   3618: }
                   3619: 
1.70      bowersj2 3620: =pod
                   3621: 
                   3622: B<Map Methods>
                   3623: 
1.174     albertel 3624: These methods are useful for getting information about the map
                   3625: properties of the resource, if the resource is a map (B<is_map>).
1.70      bowersj2 3626: 
                   3627: =over 4
                   3628: 
1.174     albertel 3629: =item * B<map_finish>:
                   3630: 
                   3631: Returns a reference to a resource object corresponding to the finish
                   3632: resource of the map.
1.70      bowersj2 3633: 
1.174     albertel 3634: =item * B<map_pc>:
1.70      bowersj2 3635: 
1.174     albertel 3636: Returns the pc value of the map, which is the first number that
                   3637: appears in the resource ID of the resources in the map, and is the
                   3638: number that appears around the middle of the symbs of the resources in
                   3639: that map.
1.70      bowersj2 3640: 
1.174     albertel 3641: =item * B<map_start>:
                   3642: 
                   3643: Returns a reference to a resource object corresponding to the start
                   3644: resource of the map.
                   3645: 
                   3646: =item * B<map_type>:
                   3647: 
                   3648: Returns a string with the type of the map in it.
1.70      bowersj2 3649: 
                   3650: =back
1.51      bowersj2 3651: 
1.70      bowersj2 3652: =cut
1.51      bowersj2 3653: 
                   3654: sub map_finish {
                   3655:     my $self = shift;
                   3656:     my $src = $self->src();
1.144     bowersj2 3657:     $src = Apache::lonnet::clutter($src);
1.51      bowersj2 3658:     my $res = $self->navHash("map_finish_$src", 0);
                   3659:     $res = $self->{NAV_MAP}->getById($res);
                   3660:     return $res;
                   3661: }
1.70      bowersj2 3662: sub map_pc {
                   3663:     my $self = shift;
                   3664:     my $src = $self->src();
                   3665:     return $self->navHash("map_pc_$src", 0);
                   3666: }
1.51      bowersj2 3667: sub map_start {
                   3668:     my $self = shift;
                   3669:     my $src = $self->src();
1.144     bowersj2 3670:     $src = Apache::lonnet::clutter($src);
1.51      bowersj2 3671:     my $res = $self->navHash("map_start_$src", 0);
                   3672:     $res = $self->{NAV_MAP}->getById($res);
                   3673:     return $res;
                   3674: }
                   3675: sub map_type {
                   3676:     my $self = shift;
                   3677:     my $pc = $self->map_pc();
                   3678:     return $self->navHash("map_type_$pc", 0);
                   3679: }
                   3680: 
                   3681: #####
                   3682: # Property queries
                   3683: #####
                   3684: 
                   3685: # These functions will be responsible for returning the CORRECT
                   3686: # VALUE for the parameter, no matter what. So while they may look
                   3687: # like direct calls to parmval, they can be more then that.
                   3688: # So, for instance, the duedate function should use the "duedatetype"
                   3689: # information, rather then the resource object user.
                   3690: 
                   3691: =pod
                   3692: 
                   3693: =head2 Resource Parameters
                   3694: 
1.174     albertel 3695: In order to use the resource parameters correctly, the nav map must
                   3696: have been instantiated with genCourseAndUserOptions set to true, so
                   3697: the courseopt and useropt is read correctly. Then, you can call these
                   3698: functions to get the relevant parameters for the resource. Each
                   3699: function defaults to part "0", but can be directed to another part by
                   3700: passing the part as the parameter.
                   3701: 
                   3702: These methods are responsible for getting the parameter correct, not
                   3703: merely reflecting the contents of the GDBM hashes. As we move towards
                   3704: dates relative to other dates, these methods should be updated to
                   3705: reflect that. (Then, anybody using these methods will not have to update
                   3706: their code.)
                   3707: 
                   3708: =over 4
                   3709: 
                   3710: =item * B<acc>:
                   3711: 
                   3712: Get the Client IP/Name Access Control information.
1.51      bowersj2 3713: 
1.174     albertel 3714: =item * B<answerdate>:
1.51      bowersj2 3715: 
1.174     albertel 3716: Get the answer-reveal date for the problem.
                   3717: 
1.211     bowersj2 3718: =item * B<awarded>: 
                   3719: 
                   3720: Gets the awarded value for the problem part. Requires genUserData set to
                   3721: true when the navmap object was created.
                   3722: 
1.174     albertel 3723: =item * B<duedate>:
                   3724: 
                   3725: Get the due date for the problem.
                   3726: 
                   3727: =item * B<tries>:
                   3728: 
                   3729: Get the number of tries the student has used on the problem.
                   3730: 
                   3731: =item * B<maxtries>:
                   3732: 
                   3733: Get the number of max tries allowed.
                   3734: 
                   3735: =item * B<opendate>:
1.51      bowersj2 3736: 
1.174     albertel 3737: Get the open date for the problem.
1.51      bowersj2 3738: 
1.174     albertel 3739: =item * B<sig>:
1.51      bowersj2 3740: 
1.174     albertel 3741: Get the significant figures setting.
1.51      bowersj2 3742: 
1.174     albertel 3743: =item * B<tol>:
1.51      bowersj2 3744: 
1.174     albertel 3745: Get the tolerance for the problem.
1.51      bowersj2 3746: 
1.174     albertel 3747: =item * B<tries>:
1.51      bowersj2 3748: 
1.174     albertel 3749: Get the number of tries the user has already used on the problem.
1.51      bowersj2 3750: 
1.174     albertel 3751: =item * B<type>:
1.51      bowersj2 3752: 
1.174     albertel 3753: Get the question type for the problem.
1.70      bowersj2 3754: 
1.174     albertel 3755: =item * B<weight>:
1.51      bowersj2 3756: 
1.174     albertel 3757: Get the weight for the problem.
1.51      bowersj2 3758: 
                   3759: =back
                   3760: 
                   3761: =cut
                   3762: 
                   3763: sub acc {
                   3764:     (my $self, my $part) = @_;
                   3765:     return $self->parmval("acc", $part);
                   3766: }
                   3767: sub answerdate {
                   3768:     (my $self, my $part) = @_;
                   3769:     # Handle intervals
                   3770:     if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
                   3771:         return $self->duedate($part) + 
                   3772:             $self->parmval("answerdate", $part);
                   3773:     }
                   3774:     return $self->parmval("answerdate", $part);
1.106     bowersj2 3775: }
1.211     bowersj2 3776: sub awarded { 
                   3777:     my $self = shift; my $part = shift;
1.221     bowersj2 3778:     $self->{NAV_MAP}->get_user_data();
1.211     bowersj2 3779:     if (!defined($part)) { $part = '0'; }
                   3780:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
                   3781: }
1.51      bowersj2 3782: sub duedate {
                   3783:     (my $self, my $part) = @_;
1.260     albertel 3784:     my $interval=$self->parmval("interval", $part);
                   3785:     if ($interval) {
                   3786: 	my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
                   3787: 	if ($first_access) { return ($first_access+$interval); }
                   3788:     }
1.51      bowersj2 3789:     return $self->parmval("duedate", $part);
                   3790: }
                   3791: sub maxtries {
                   3792:     (my $self, my $part) = @_;
                   3793:     return $self->parmval("maxtries", $part);
                   3794: }
                   3795: sub opendate {
                   3796:     (my $self, my $part) = @_;
                   3797:     if ($self->parmval("opendate.type", $part) eq 'date_interval') {
                   3798:         return $self->duedate($part) -
                   3799:             $self->parmval("opendate", $part);
                   3800:     }
                   3801:     return $self->parmval("opendate");
                   3802: }
1.185     bowersj2 3803: sub problemstatus {
                   3804:     (my $self, my $part) = @_;
1.236     bowersj2 3805:     return lc $self->parmval("problemstatus", $part);
1.185     bowersj2 3806: }
1.51      bowersj2 3807: sub sig {
                   3808:     (my $self, my $part) = @_;
                   3809:     return $self->parmval("sig", $part);
                   3810: }
                   3811: sub tol {
                   3812:     (my $self, my $part) = @_;
                   3813:     return $self->parmval("tol", $part);
                   3814: }
1.108     bowersj2 3815: sub tries { 
                   3816:     my $self = shift; 
                   3817:     my $tries = $self->queryRestoreHash('tries', shift);
                   3818:     if (!defined($tries)) { return '0';}
1.51      bowersj2 3819:     return $tries;
                   3820: }
1.70      bowersj2 3821: sub type {
                   3822:     (my $self, my $part) = @_;
                   3823:     return $self->parmval("type", $part);
                   3824: }
1.109     bowersj2 3825: sub weight { 
                   3826:     my $self = shift; my $part = shift;
1.211     bowersj2 3827:     if (!defined($part)) { $part = '0'; }
                   3828:     return &Apache::lonnet::EXT('resource.'.$part.'.weight',
                   3829: 				$self->symb(), $ENV{'user.domain'},
                   3830: 				$ENV{'user.name'}, 
                   3831: 				$ENV{'request.course.sec'});
1.274     matthew  3832: }
                   3833: sub part_display {
                   3834:     my $self= shift(); my $partID = shift();
                   3835:     if (! defined($partID)) { $partID = '0'; }
                   3836:     my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
                   3837:                                      $self->symb);
                   3838:     if (! defined($display) || $display eq '') {
                   3839:         $display = $partID;
                   3840:     }
                   3841:     return $display;
1.70      bowersj2 3842: }
1.51      bowersj2 3843: 
                   3844: # Multiple things need this
                   3845: sub getReturnHash {
                   3846:     my $self = shift;
                   3847:     
                   3848:     if (!defined($self->{RETURN_HASH})) {
1.84      bowersj2 3849:         my %tmpHash  = &Apache::lonnet::restore($self->symb());
1.51      bowersj2 3850:         $self->{RETURN_HASH} = \%tmpHash;
                   3851:     }
                   3852: }       
                   3853: 
                   3854: ######
                   3855: # Status queries
                   3856: ######
                   3857: 
                   3858: # These methods query the status of problems.
                   3859: 
                   3860: # If we need to count parts, this function determines the number of
                   3861: # parts from the metadata. When called, it returns a reference to a list
                   3862: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   3863: # tells you how many parts you have in the problem:
                   3864: # $partcount = scalar($resource->countParts());
                   3865: # Don't use $self->{PARTS} directly because you don't know if it's been
                   3866: # computed yet.
                   3867: 
                   3868: =pod
                   3869: 
                   3870: =head2 Resource misc
                   3871: 
                   3872: Misc. functions for the resource.
                   3873: 
                   3874: =over 4
                   3875: 
1.174     albertel 3876: =item * B<hasDiscussion>:
1.59      bowersj2 3877: 
1.174     albertel 3878: Returns a false value if there has been discussion since the user last
                   3879: logged in, true if there has. Always returns false if the discussion
                   3880: data was not extracted when the nav map was constructed.
                   3881: 
                   3882: =item * B<getFeedback>:
                   3883: 
                   3884: Gets the feedback for the resource and returns the raw feedback string
                   3885: for the resource, or the null string if there is no feedback or the
                   3886: email data was not extracted when the nav map was constructed. Usually
                   3887: used like this:
1.59      bowersj2 3888: 
                   3889:  for (split(/\,/, $res->getFeedback())) {
                   3890:     my $link = &Apache::lonnet::escape($_);
                   3891:     ...
                   3892: 
                   3893: and use the link as appropriate.
                   3894: 
                   3895: =cut
                   3896: 
                   3897: sub hasDiscussion {
                   3898:     my $self = shift;
                   3899:     return $self->{NAV_MAP}->hasDiscussion($self->symb());
                   3900: }
                   3901: 
                   3902: sub getFeedback {
                   3903:     my $self = shift;
1.124     bowersj2 3904:     my $source = $self->src();
1.125     bowersj2 3905:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124     bowersj2 3906:     return $self->{NAV_MAP}->getFeedback($source);
                   3907: }
                   3908: 
                   3909: sub getErrors {
                   3910:     my $self = shift;
                   3911:     my $source = $self->src();
                   3912:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
                   3913:     return $self->{NAV_MAP}->getErrors($source);
1.59      bowersj2 3914: }
                   3915: 
                   3916: =pod
                   3917: 
1.174     albertel 3918: =item * B<parts>():
1.51      bowersj2 3919: 
1.174     albertel 3920: Returns a list reference containing sorted strings corresponding to
1.193     bowersj2 3921: each part of the problem. Single part problems have only a part '0'.
                   3922: Multipart problems do not return their part '0', since they typically
                   3923: do not really matter. 
1.174     albertel 3924: 
                   3925: =item * B<countParts>():
                   3926: 
                   3927: Returns the number of parts of the problem a student can answer. Thus,
                   3928: for single part problems, returns 1. For multipart, it returns the
1.193     bowersj2 3929: number of parts in the problem, not including psuedo-part 0. 
1.51      bowersj2 3930: 
1.290     matthew  3931: =item * B<countResponses>():
                   3932: 
                   3933: Returns the total number of responses in the problem a student can answer.
                   3934: 
                   3935: =item * B<responseTypes>():
                   3936: 
                   3937: Returns a hash whose keys are the response types.  The values are the number 
                   3938: of times each response type is used.  This is for the I<entire> problem, not 
                   3939: just a single part.
                   3940: 
1.192     bowersj2 3941: =item * B<multipart>():
                   3942: 
1.193     bowersj2 3943: Returns true if the problem is multipart, false otherwise. Use this instead
                   3944: of countParts if all you want is multipart/not multipart.
1.192     bowersj2 3945: 
1.187     bowersj2 3946: =item * B<responseType>($part):
                   3947: 
                   3948: Returns the response type of the part, without the word "response" on the
                   3949: end. Example return values: 'string', 'essay', 'numeric', etc.
                   3950: 
1.193     bowersj2 3951: =item * B<responseIds>($part):
1.187     bowersj2 3952: 
1.193     bowersj2 3953: Retreives the response IDs for the given part as an array reference containing
                   3954: strings naming the response IDs. This may be empty.
1.187     bowersj2 3955: 
1.51      bowersj2 3956: =back
                   3957: 
                   3958: =cut
                   3959: 
                   3960: sub parts {
                   3961:     my $self = shift;
                   3962: 
1.192     bowersj2 3963:     if ($self->ext) { return []; }
1.67      bowersj2 3964: 
1.51      bowersj2 3965:     $self->extractParts();
                   3966:     return $self->{PARTS};
                   3967: }
                   3968: 
                   3969: sub countParts {
                   3970:     my $self = shift;
                   3971:     
                   3972:     my $parts = $self->parts();
1.191     bowersj2 3973: 
                   3974:     # If I left this here, then it's not necessary.
                   3975:     #my $delta = 0;
                   3976:     #for my $part (@$parts) {
                   3977:     #    if ($part eq '0') { $delta--; }
                   3978:     #}
1.66      bowersj2 3979: 
                   3980:     if ($self->{RESOURCE_ERROR}) {
                   3981:         return 0;
                   3982:     }
                   3983: 
1.191     bowersj2 3984:     return scalar(@{$parts}); # + $delta;
1.192     bowersj2 3985: }
                   3986: 
1.290     matthew  3987: sub countResponses {
                   3988:     my $self = shift;
                   3989:     my $count;
1.293     matthew  3990:     foreach my $part (@{$self->parts()}) {
                   3991:         $count+= scalar($self->responseIds($part));
1.290     matthew  3992:     }
                   3993:     return $count;
                   3994: }
                   3995: 
                   3996: sub responseTypes {
                   3997:     my $self = shift;
1.291     albertel 3998:     my %responses;
1.290     matthew  3999:     foreach my $part ($self->parts()) {
                   4000:         foreach my $responsetype ($self->responseType($part)) {
1.291     albertel 4001:             $responses{$responsetype}++ if (defined($responsetype));
1.290     matthew  4002:         }
                   4003:     }
1.291     albertel 4004:     return %responses;
1.290     matthew  4005: }
                   4006: 
1.192     bowersj2 4007: sub multipart {
                   4008:     my $self = shift;
                   4009:     return $self->countParts() > 1;
1.51      bowersj2 4010: }
                   4011: 
1.225     bowersj2 4012: sub singlepart {
                   4013:     my $self = shift;
                   4014:     return $self->countParts() == 1;
                   4015: }
                   4016: 
1.187     bowersj2 4017: sub responseType {
1.184     bowersj2 4018:     my $self = shift;
                   4019:     my $part = shift;
                   4020: 
                   4021:     $self->extractParts();
1.235     albertel 4022:     if (defined($self->{RESPONSE_TYPES}->{$part})) {
                   4023: 	return @{$self->{RESPONSE_TYPES}->{$part}};
                   4024:     } else {
                   4025: 	return undef;
                   4026:     }
1.187     bowersj2 4027: }
                   4028: 
1.193     bowersj2 4029: sub responseIds {
1.187     bowersj2 4030:     my $self = shift;
                   4031:     my $part = shift;
                   4032: 
                   4033:     $self->extractParts();
1.235     albertel 4034:     if (defined($self->{RESPONSE_IDS}->{$part})) {
                   4035: 	return @{$self->{RESPONSE_IDS}->{$part}};
                   4036:     } else {
                   4037: 	return undef;
                   4038:     }
1.184     bowersj2 4039: }
                   4040: 
                   4041: # Private function: Extracts the parts information, both part names and
1.187     bowersj2 4042: # part types, and saves it. 
1.51      bowersj2 4043: sub extractParts { 
                   4044:     my $self = shift;
                   4045:     
1.153     bowersj2 4046:     return if (defined($self->{PARTS}));
1.67      bowersj2 4047:     return if ($self->ext);
1.51      bowersj2 4048: 
                   4049:     $self->{PARTS} = [];
                   4050: 
1.181     bowersj2 4051:     my %parts;
                   4052: 
1.82      bowersj2 4053:     # Retrieve part count, if this is a problem
                   4054:     if ($self->is_problem()) {
1.240     albertel 4055: 	my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152     matthew  4056:         my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181     bowersj2 4057: 
1.239     bowersj2 4058: 	if ($partorder) {
                   4059: 	    my @parts;
                   4060: 	    for my $part (split (/,/,$partorder)) {
                   4061: 		if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4062: 		    push @parts, $part;
1.241     albertel 4063: 		    $parts{$part} = 1;
1.239     bowersj2 4064: 		}
                   4065: 	    }
                   4066: 	    $self->{PARTS} = \@parts;
                   4067: 	} else {
                   4068: 	    if (!$metadata) {
                   4069: 		$self->{RESOURCE_ERROR} = 1;
                   4070: 		$self->{PARTS} = [];
                   4071: 		$self->{PART_TYPE} = {};
                   4072: 		return;
                   4073: 	    }
                   4074: 	    foreach (split(/\,/,$metadata)) {
                   4075: 		if ($_ =~ /^part_(.*)$/) {
                   4076: 		    my $part = $1;
                   4077: 		    # This floods the logs if it blows up
                   4078: 		    if (defined($parts{$part})) {
1.241     albertel 4079: 			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
                   4080: 		    }
1.239     bowersj2 4081: 		    
                   4082: 		    # check to see if part is turned off.
                   4083: 		    
                   4084: 		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4085: 			$parts{$part} = 1;
                   4086: 		    }
                   4087: 		}
                   4088: 	    }
                   4089: 	    my @sortedParts = sort keys %parts;
                   4090: 	    $self->{PARTS} = \@sortedParts;
1.51      bowersj2 4091:         }
1.82      bowersj2 4092:         
1.187     bowersj2 4093: 
1.284     matthew  4094:         # These hashes probably do not need names that end with "Hash"....
1.187     bowersj2 4095:         my %responseIdHash;
                   4096:         my %responseTypeHash;
                   4097: 
1.189     bowersj2 4098: 
                   4099:         # Init the responseIdHash
                   4100:         foreach (@{$self->{PARTS}}) {
                   4101:             $responseIdHash{$_} = [];
                   4102:         }
                   4103: 
1.187     bowersj2 4104:         # Now, the unfortunate thing about this is that parts, part name, and
1.239     bowersj2 4105:         # response id are delimited by underscores, but both the part
1.187     bowersj2 4106:         # name and response id can themselves have underscores in them.
                   4107:         # So we have to use our knowlege of part names to figure out 
                   4108:         # where the part names begin and end, and even then, it is possible
                   4109:         # to construct ambiguous situations.
                   4110:         foreach (split /,/, $metadata) {
                   4111:             if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
                   4112:                 my $responseType = $1;
                   4113:                 my $partStuff = $2;
                   4114:                 my $partIdSoFar = '';
                   4115:                 my @partChunks = split /_/, $partStuff;
                   4116:                 my $i = 0;
                   4117:                 for ($i = 0; $i < scalar(@partChunks); $i++) {
                   4118:                     if ($partIdSoFar) { $partIdSoFar .= '_'; }
                   4119:                     $partIdSoFar .= $partChunks[$i];
                   4120:                     if ($parts{$partIdSoFar}) {
                   4121:                         my @otherChunks = @partChunks[$i+1..$#partChunks];
                   4122:                         my $responseId = join('_', @otherChunks);
1.188     bowersj2 4123:                         push @{$responseIdHash{$partIdSoFar}}, $responseId;
1.233     matthew  4124:                         push @{$responseTypeHash{$partIdSoFar}}, $responseType;
1.187     bowersj2 4125:                     }
                   4126:                 }
                   4127:             }
                   4128:         }
1.264     albertel 4129: 	my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
1.284     matthew  4130:         #
                   4131:         # Reorder the arrays in the %responseIdHash and %responseTypeHash
1.264     albertel 4132: 	if ($resorder) {
                   4133: 	    my @resorder=split(/,/,$resorder);
                   4134: 	    foreach my $part (keys(%responseIdHash)) {
1.286     albertel 4135: 		my $i=0;
                   4136: 		my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
1.264     albertel 4137: 		my @neworder;
                   4138: 		foreach my $possibleid (@resorder) {
                   4139: 		    if (exists($resids{$possibleid})) {
1.286     albertel 4140: 			push(@neworder,$resids{$possibleid});
1.264     albertel 4141: 		    }
                   4142: 		}
1.286     albertel 4143: 		my @ids;
                   4144: 		my @type;
                   4145: 		foreach my $element (@neworder) {
                   4146: 		    push (@ids,$responseIdHash{$part}->[$element]);
                   4147: 		    push (@type,$responseTypeHash{$part}->[$element]);
                   4148: 		}
                   4149: 		$responseIdHash{$part}=\@ids;
                   4150: 		$responseTypeHash{$part}=\@type;
1.264     albertel 4151: 	    }
                   4152: 	}
1.187     bowersj2 4153:         $self->{RESPONSE_IDS} = \%responseIdHash;
                   4154:         $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154     bowersj2 4155:     }
                   4156: 
1.51      bowersj2 4157:     return;
                   4158: }
                   4159: 
                   4160: =pod
                   4161: 
                   4162: =head2 Resource Status
                   4163: 
1.174     albertel 4164: Problem resources have status information, reflecting their various
                   4165: dates and completion statuses.
1.51      bowersj2 4166: 
1.174     albertel 4167: There are two aspects to the status: the date-related information and
                   4168: the completion information.
1.51      bowersj2 4169: 
1.174     albertel 4170: Idiomatic usage of these two methods would probably look something
                   4171: like
1.51      bowersj2 4172: 
                   4173:  foreach ($resource->parts()) {
                   4174:     my $dateStatus = $resource->getDateStatus($_);
                   4175:     my $completionStatus = $resource->getCompletionStatus($_);
                   4176: 
1.70      bowersj2 4177:     or
                   4178: 
                   4179:     my $status = $resource->status($_);
                   4180: 
1.51      bowersj2 4181:     ... use it here ...
                   4182:  }
                   4183: 
1.174     albertel 4184: Which you use depends on exactly what you are looking for. The
                   4185: status() function has been optimized for the nav maps display and may
                   4186: not precisely match what you need elsewhere.
1.101     bowersj2 4187: 
1.174     albertel 4188: The symbolic constants shown below can be accessed through the
                   4189: resource object: C<$res->OPEN>.
1.101     bowersj2 4190: 
1.51      bowersj2 4191: =over 4
                   4192: 
1.174     albertel 4193: =item * B<getDateStatus>($part):
                   4194: 
                   4195: ($part defaults to 0). A convenience function that returns a symbolic
                   4196: constant telling you about the date status of the part. The possible
                   4197: return values are:
1.51      bowersj2 4198: 
                   4199: =back
                   4200: 
                   4201: B<Date Codes>
                   4202: 
                   4203: =over 4
                   4204: 
1.174     albertel 4205: =item * B<OPEN_LATER>:
                   4206: 
                   4207: The problem will be opened later.
                   4208: 
                   4209: =item * B<OPEN>:
                   4210: 
                   4211: Open and not yet due.
                   4212: 
1.51      bowersj2 4213: 
1.174     albertel 4214: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4215: 
1.174     albertel 4216: The due date has passed, but the answer date has not yet arrived.
1.59      bowersj2 4217: 
1.174     albertel 4218: =item * B<PAST_DUE_NO_ANSWER>:
1.54      bowersj2 4219: 
1.174     albertel 4220: The due date has passed and there is no answer opening date set.
1.51      bowersj2 4221: 
1.174     albertel 4222: =item * B<ANSWER_OPEN>:
1.51      bowersj2 4223: 
1.174     albertel 4224: The answer date is here.
                   4225: 
                   4226: =item * B<NETWORK_FAILURE>:
                   4227: 
                   4228: The information is unknown due to network failure.
1.51      bowersj2 4229: 
                   4230: =back
                   4231: 
                   4232: =cut
                   4233: 
                   4234: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 4235: sub OPEN_LATER             { return 0; }
                   4236: sub OPEN                   { return 1; }
                   4237: sub PAST_DUE_NO_ANSWER     { return 2; }
                   4238: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   4239: sub ANSWER_OPEN            { return 4; }
                   4240: sub NOTHING_SET            { return 5; } 
                   4241: sub NETWORK_FAILURE        { return 100; }
                   4242: 
                   4243: # getDateStatus gets the date status for a given problem part. 
                   4244: # Because answer date, due date, and open date are fully independent
                   4245: # (i.e., it is perfectly possible to *only* have an answer date), 
                   4246: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   4247: # (past, future, none given). This function handles this with a decision
                   4248: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 4249: 
                   4250: sub getDateStatus {
                   4251:     my $self = shift;
                   4252:     my $part = shift;
                   4253:     $part = "0" if (!defined($part));
1.54      bowersj2 4254: 
                   4255:     # Always return network failure if there was one.
1.51      bowersj2 4256:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4257: 
                   4258:     my $now = time();
                   4259: 
1.53      bowersj2 4260:     my $open = $self->opendate($part);
                   4261:     my $due = $self->duedate($part);
                   4262:     my $answer = $self->answerdate($part);
                   4263: 
                   4264:     if (!$open && !$due && !$answer) {
                   4265:         # no data on the problem at all
                   4266:         # should this be the same as "open later"? think multipart.
                   4267:         return $self->NOTHING_SET;
                   4268:     }
1.59      bowersj2 4269:     if (!$open || $now < $open) {return $self->OPEN_LATER}
                   4270:     if (!$due || $now < $due) {return $self->OPEN}
                   4271:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
                   4272:     if ($answer) { return $self->ANSWER_OPEN; }
1.54      bowersj2 4273:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 4274: }
                   4275: 
                   4276: =pod
                   4277: 
                   4278: B<>
                   4279: 
                   4280: =over 4
                   4281: 
1.174     albertel 4282: =item * B<getCompletionStatus>($part):
1.51      bowersj2 4283: 
1.174     albertel 4284: ($part defaults to 0.) A convenience function that returns a symbolic
                   4285: constant telling you about the completion status of the part, with the
                   4286: following possible results:
                   4287: 
                   4288: =back
1.51      bowersj2 4289: 
                   4290: B<Completion Codes>
                   4291: 
                   4292: =over 4
                   4293: 
1.174     albertel 4294: =item * B<NOT_ATTEMPTED>:
                   4295: 
                   4296: Has not been attempted at all.
                   4297: 
                   4298: =item * B<INCORRECT>:
                   4299: 
                   4300: Attempted, but wrong by student.
1.51      bowersj2 4301: 
1.174     albertel 4302: =item * B<INCORRECT_BY_OVERRIDE>:
1.51      bowersj2 4303: 
1.174     albertel 4304: Attempted, but wrong by instructor override.
1.51      bowersj2 4305: 
1.174     albertel 4306: =item * B<CORRECT>:
1.51      bowersj2 4307: 
1.174     albertel 4308: Correct or correct by instructor.
1.51      bowersj2 4309: 
1.174     albertel 4310: =item * B<CORRECT_BY_OVERRIDE>:
1.51      bowersj2 4311: 
1.174     albertel 4312: Correct by instructor override.
1.51      bowersj2 4313: 
1.174     albertel 4314: =item * B<EXCUSED>:
                   4315: 
                   4316: Excused. Not yet implemented.
                   4317: 
                   4318: =item * B<NETWORK_FAILURE>:
                   4319: 
                   4320: Information not available due to network failure.
                   4321: 
                   4322: =item * B<ATTEMPTED>:
                   4323: 
                   4324: Attempted, and not yet graded.
1.69      bowersj2 4325: 
1.51      bowersj2 4326: =back
                   4327: 
                   4328: =cut
                   4329: 
1.53      bowersj2 4330: sub NOT_ATTEMPTED         { return 10; }
                   4331: sub INCORRECT             { return 11; }
                   4332: sub INCORRECT_BY_OVERRIDE { return 12; }
                   4333: sub CORRECT               { return 13; }
                   4334: sub CORRECT_BY_OVERRIDE   { return 14; }
                   4335: sub EXCUSED               { return 15; }
1.69      bowersj2 4336: sub ATTEMPTED             { return 16; }
1.51      bowersj2 4337: 
                   4338: sub getCompletionStatus {
                   4339:     my $self = shift;
                   4340:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4341: 
1.108     bowersj2 4342:     my $status = $self->queryRestoreHash('solved', shift);
1.51      bowersj2 4343: 
1.251     www      4344:     # Left as separate if statements in case we ever do more with this
1.51      bowersj2 4345:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
1.288     albertel 4346:     if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
1.51      bowersj2 4347:     if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
                   4348:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   4349:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   4350:     if ($status eq 'excused') {return $self->EXCUSED; }
1.69      bowersj2 4351:     if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51      bowersj2 4352:     return $self->NOT_ATTEMPTED;
1.108     bowersj2 4353: }
                   4354: 
                   4355: sub queryRestoreHash {
                   4356:     my $self = shift;
                   4357:     my $hashentry = shift;
                   4358:     my $part = shift;
1.185     bowersj2 4359:     $part = "0" if (!defined($part) || $part eq '');
1.108     bowersj2 4360:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4361: 
                   4362:     $self->getReturnHash();
                   4363: 
                   4364:     return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51      bowersj2 4365: }
                   4366: 
                   4367: =pod
                   4368: 
                   4369: B<Composite Status>
                   4370: 
1.174     albertel 4371: Along with directly returning the date or completion status, the
                   4372: resource object includes a convenience function B<status>() that will
                   4373: combine the two status tidbits into one composite status that can
1.191     bowersj2 4374: represent the status of the resource as a whole. This method represents
                   4375: the concept of the thing we want to display to the user on the nav maps
                   4376: screen, which is a combination of completion and open status. The precise logic is
1.174     albertel 4377: documented in the comments of the status method. The following results
                   4378: may be returned, all available as methods on the resource object
1.185     bowersj2 4379: ($res->NETWORK_FAILURE): In addition to the return values that match
                   4380: the date or completion status, this function can return "ANSWER_SUBMITTED"
                   4381: if that problemstatus parameter value is set to No, suppressing the
                   4382: incorrect/correct feedback.
1.51      bowersj2 4383: 
                   4384: =over 4
                   4385: 
1.174     albertel 4386: =item * B<NETWORK_FAILURE>:
                   4387: 
                   4388: The network has failed and the information is not available.
1.51      bowersj2 4389: 
1.174     albertel 4390: =item * B<NOTHING_SET>:
1.53      bowersj2 4391: 
1.174     albertel 4392: No dates have been set for this problem (part) at all. (Because only
                   4393: certain parts of a multi-part problem may be assigned, this can not be
                   4394: collapsed into "open later", as we do not know a given part will EVER
                   4395: be opened. For single part, this is the same as "OPEN_LATER".)
1.51      bowersj2 4396: 
1.174     albertel 4397: =item * B<CORRECT>:
1.51      bowersj2 4398: 
1.174     albertel 4399: For any reason at all, the part is considered correct.
1.54      bowersj2 4400: 
1.174     albertel 4401: =item * B<EXCUSED>:
1.51      bowersj2 4402: 
1.174     albertel 4403: For any reason at all, the problem is excused.
1.51      bowersj2 4404: 
1.174     albertel 4405: =item * B<PAST_DUE_NO_ANSWER>:
1.51      bowersj2 4406: 
1.174     albertel 4407: The problem is past due, not considered correct, and no answer date is
                   4408: set.
1.51      bowersj2 4409: 
1.174     albertel 4410: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4411: 
1.174     albertel 4412: The problem is past due, not considered correct, and an answer date in
                   4413: the future is set.
1.51      bowersj2 4414: 
1.174     albertel 4415: =item * B<ANSWER_OPEN>:
                   4416: 
                   4417: The problem is past due, not correct, and the answer is now available.
                   4418: 
                   4419: =item * B<OPEN_LATER>:
                   4420: 
                   4421: The problem is not yet open.
                   4422: 
                   4423: =item * B<TRIES_LEFT>:
                   4424: 
                   4425: The problem is open, has been tried, is not correct, but there are
                   4426: tries left.
                   4427: 
                   4428: =item * B<INCORRECT>:
                   4429: 
                   4430: The problem is open, and all tries have been used without getting the
                   4431: correct answer.
                   4432: 
                   4433: =item * B<OPEN>:
                   4434: 
                   4435: The item is open and not yet tried.
                   4436: 
                   4437: =item * B<ATTEMPTED>:
                   4438: 
                   4439: The problem has been attempted.
1.69      bowersj2 4440: 
1.185     bowersj2 4441: =item * B<ANSWER_SUBMITTED>:
                   4442: 
                   4443: An answer has been submitted, but the student should not see it.
                   4444: 
1.51      bowersj2 4445: =back
                   4446: 
                   4447: =cut
                   4448: 
1.185     bowersj2 4449: sub TRIES_LEFT       { return 20; }
                   4450: sub ANSWER_SUBMITTED { return 21; }
1.51      bowersj2 4451: 
                   4452: sub status {
                   4453:     my $self = shift;
                   4454:     my $part = shift;
                   4455:     if (!defined($part)) { $part = "0"; }
                   4456:     my $completionStatus = $self->getCompletionStatus($part);
                   4457:     my $dateStatus = $self->getDateStatus($part);
                   4458: 
                   4459:     # What we have is a two-dimensional matrix with 4 entries on one
                   4460:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 4461:     # plus network failure and "no date data at all".
1.51      bowersj2 4462: 
1.222     bowersj2 4463:     #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53      bowersj2 4464:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 4465: 
1.236     bowersj2 4466:     my $suppressFeedback = $self->problemstatus($part) eq 'no';
                   4467:     # If there's an answer date and we're past it, don't
                   4468:     # suppress the feedback; student should know
                   4469:     if ($self->answerdate($part) && $self->answerdate($part) < time()) {
                   4470: 	$suppressFeedback = 0;
                   4471:     }
1.185     bowersj2 4472: 
1.51      bowersj2 4473:     # There are a few whole rows we can dispose of:
1.53      bowersj2 4474:     if ($completionStatus == CORRECT ||
                   4475:         $completionStatus == CORRECT_BY_OVERRIDE ) {
1.185     bowersj2 4476:         return $suppressFeedback? ANSWER_SUBMITTED : CORRECT; 
1.69      bowersj2 4477:     }
                   4478: 
                   4479:     if ($completionStatus == ATTEMPTED) {
                   4480:         return ATTEMPTED;
1.53      bowersj2 4481:     }
                   4482: 
                   4483:     # If it's EXCUSED, then return that no matter what
                   4484:     if ($completionStatus == EXCUSED) {
                   4485:         return EXCUSED; 
1.51      bowersj2 4486:     }
                   4487: 
1.53      bowersj2 4488:     if ($dateStatus == NOTHING_SET) {
                   4489:         return NOTHING_SET;
1.51      bowersj2 4490:     }
                   4491: 
1.69      bowersj2 4492:     # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
                   4493:     # by 4 matrix (date statuses).
1.51      bowersj2 4494: 
1.54      bowersj2 4495:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59      bowersj2 4496:         $dateStatus == PAST_DUE_NO_ANSWER ) {
1.272     albertel 4497:         return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus; 
1.51      bowersj2 4498:     }
                   4499: 
1.53      bowersj2 4500:     if ($dateStatus == ANSWER_OPEN) {
                   4501:         return ANSWER_OPEN;
1.51      bowersj2 4502:     }
                   4503: 
                   4504:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   4505:     # (open_later), (open)
                   4506:     
1.53      bowersj2 4507:     if ($dateStatus == OPEN_LATER) {
                   4508:         return OPEN_LATER;
1.51      bowersj2 4509:     }
                   4510: 
                   4511:     # If it's WRONG...
1.53      bowersj2 4512:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 4513:         # and there are TRIES LEFT:
1.79      bowersj2 4514:         if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222     bowersj2 4515:             return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51      bowersj2 4516:         }
1.185     bowersj2 4517:         return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 4518:     }
                   4519: 
                   4520:     # Otherwise, it's untried and open
1.53      bowersj2 4521:     return OPEN; 
1.224     bowersj2 4522: }
                   4523: 
                   4524: sub CLOSED { return 23; }
                   4525: sub ERROR { return 24; }
                   4526: 
                   4527: =pod
                   4528: 
                   4529: B<Simple Status>
                   4530: 
                   4531: Convenience method B<simpleStatus> provides a "simple status" for the resource.
                   4532: "Simple status" corresponds to "which icon is shown on the
                   4533: Navmaps". There are six "simple" statuses:
                   4534: 
                   4535: =over 4
                   4536: 
                   4537: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
                   4538: 
                   4539: =item * B<OPEN>: The problem is open and unattempted.
                   4540: 
                   4541: =item * B<CORRECT>: The problem is correct for any reason.
                   4542: 
                   4543: =item * B<INCORRECT>: The problem is incorrect and can still be
                   4544: completed successfully.
                   4545: 
                   4546: =item * B<ATTEMPTED>: The problem has been attempted, but the student
                   4547: does not know if they are correct. (The ellipsis icon.)
                   4548: 
                   4549: =item * B<ERROR>: There is an error retrieving information about this
                   4550: problem.
                   4551: 
                   4552: =back
                   4553: 
                   4554: =cut
                   4555: 
                   4556: # This hash maps the composite status to this simple status, and
                   4557: # can be used directly, if you like
                   4558: my %compositeToSimple = 
                   4559:     (
                   4560:       NETWORK_FAILURE()       => ERROR,
                   4561:       NOTHING_SET()           => CLOSED,
                   4562:       CORRECT()               => CORRECT,
                   4563:       EXCUSED()               => CORRECT,
                   4564:       PAST_DUE_NO_ANSWER()    => INCORRECT,
                   4565:       PAST_DUE_ANSWER_LATER() => INCORRECT,
                   4566:       ANSWER_OPEN()           => INCORRECT,
                   4567:       OPEN_LATER()            => CLOSED,
                   4568:       TRIES_LEFT()            => OPEN,
                   4569:       INCORRECT()             => INCORRECT,
                   4570:       OPEN()                  => OPEN,
                   4571:       ATTEMPTED()             => ATTEMPTED,
                   4572:       ANSWER_SUBMITTED()      => ATTEMPTED
                   4573:      );
                   4574: 
                   4575: sub simpleStatus {
                   4576:     my $self = shift;
                   4577:     my $part = shift;
                   4578:     my $status = $self->status($part);
                   4579:     return $compositeToSimple{$status};
1.225     bowersj2 4580: }
                   4581: 
                   4582: =pod
                   4583: 
                   4584: B<simpleStatusCount> will return an array reference containing, in
                   4585: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
                   4586: and ERROR parts the given problem has.
                   4587: 
                   4588: =cut
                   4589:     
                   4590: # This maps the status to the slot we want to increment
                   4591: my %statusToSlotMap = 
                   4592:     (
                   4593:      OPEN()      => 0,
                   4594:      CLOSED()    => 1,
                   4595:      CORRECT()   => 2,
                   4596:      INCORRECT() => 3,
                   4597:      ATTEMPTED() => 4,
                   4598:      ERROR()     => 5
                   4599:      );
                   4600: 
                   4601: sub statusToSlot { return $statusToSlotMap{shift()}; }
                   4602: 
                   4603: sub simpleStatusCount {
                   4604:     my $self = shift;
                   4605: 
                   4606:     my @counts = (0, 0, 0, 0, 0, 0, 0);
                   4607:     foreach my $part (@{$self->parts()}) {
                   4608: 	$counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
                   4609:     }
                   4610: 
                   4611:     return \@counts;
1.191     bowersj2 4612: }
                   4613: 
                   4614: =pod
                   4615: 
                   4616: B<Completable>
                   4617: 
                   4618: The completable method represents the concept of I<whether the student can
                   4619: currently do the problem>. If the student can do the problem, which means
                   4620: that it is open, there are tries left, and if the problem is manually graded
                   4621: or the grade is suppressed via problemstatus, the student has not tried it
                   4622: yet, then the method returns 1. Otherwise, it returns 0, to indicate that 
                   4623: either the student has tried it and there is no feedback, or that for
                   4624: some reason it is no longer completable (not open yet, successfully completed,
                   4625: out of tries, etc.). As an example, this is used as the filter for the
                   4626: "Uncompleted Homework" option for the nav maps.
                   4627: 
                   4628: If this does not quite meet your needs, do not fiddle with it (unless you are
                   4629: fixing it to better match the student's conception of "completable" because
                   4630: it's broken somehow)... make a new method.
                   4631: 
                   4632: =cut
                   4633: 
                   4634: sub completable {
                   4635:     my $self = shift;
                   4636:     if (!$self->is_problem()) { return 0; }
                   4637:     my $partCount = $self->countParts();
                   4638: 
                   4639:     foreach my $part (@{$self->parts()}) {
                   4640:         if ($part eq '0' && $partCount != 1) { next; }
                   4641:         my $status = $self->status($part);
                   4642:         # "If any of the parts are open, or have tries left (implies open),
                   4643:         # and it is not "attempted" (manually graded problem), it is
                   4644:         # not "complete"
1.216     bowersj2 4645: 	if ($self->getCompletionStatus($part) == ATTEMPTED() ||
                   4646: 	    $status == ANSWER_SUBMITTED() ) {
                   4647: 	    # did this part already, as well as we can
                   4648: 	    next;
                   4649: 	}
                   4650: 	if ($status == OPEN() || $status == TRIES_LEFT()) {
                   4651: 	    return 1;
                   4652: 	}
1.191     bowersj2 4653:     }
                   4654:         
                   4655:     # If all the parts were complete, so was this problem.
1.216     bowersj2 4656:     return 0;
1.51      bowersj2 4657: }
                   4658: 
                   4659: =pod
                   4660: 
                   4661: =head2 Resource/Nav Map Navigation
                   4662: 
                   4663: =over 4
                   4664: 
1.174     albertel 4665: =item * B<getNext>():
                   4666: 
                   4667: Retreive an array of the possible next resources after this
                   4668: one. Always returns an array, even in the one- or zero-element case.
                   4669: 
                   4670: =item * B<getPrevious>():
1.85      bowersj2 4671: 
1.174     albertel 4672: Retreive an array of the possible previous resources from this
                   4673: one. Always returns an array, even in the one- or zero-element case.
1.51      bowersj2 4674: 
                   4675: =cut
                   4676: 
                   4677: sub getNext {
                   4678:     my $self = shift;
                   4679:     my @branches;
                   4680:     my $to = $self->to();
1.85      bowersj2 4681:     foreach my $branch ( split(/,/, $to) ) {
1.51      bowersj2 4682:         my $choice = $self->{NAV_MAP}->getById($branch);
                   4683:         my $next = $choice->goesto();
                   4684:         $next = $self->{NAV_MAP}->getById($next);
                   4685: 
1.131     bowersj2 4686:         push @branches, $next;
1.85      bowersj2 4687:     }
                   4688:     return \@branches;
                   4689: }
                   4690: 
                   4691: sub getPrevious {
                   4692:     my $self = shift;
                   4693:     my @branches;
                   4694:     my $from = $self->from();
                   4695:     foreach my $branch ( split /,/, $from) {
                   4696:         my $choice = $self->{NAV_MAP}->getById($branch);
                   4697:         my $prev = $choice->comesfrom();
                   4698:         $prev = $self->{NAV_MAP}->getById($prev);
                   4699: 
1.131     bowersj2 4700:         push @branches, $prev;
1.51      bowersj2 4701:     }
                   4702:     return \@branches;
1.131     bowersj2 4703: }
                   4704: 
                   4705: sub browsePriv {
                   4706:     my $self = shift;
                   4707:     if (defined($self->{BROWSE_PRIV})) {
                   4708:         return $self->{BROWSE_PRIV};
                   4709:     }
                   4710: 
                   4711:     $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51      bowersj2 4712: }
                   4713: 
                   4714: =pod
1.2       www      4715: 
1.51      bowersj2 4716: =back
1.2       www      4717: 
1.51      bowersj2 4718: =cut
1.2       www      4719: 
1.51      bowersj2 4720: 1;
1.2       www      4721: 
1.51      bowersj2 4722: __END__
1.2       www      4723: 
                   4724: 

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