Annotation of loncom/interface/lonnavmaps.pm, revision 1.288

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

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