Annotation of loncom/interface/lonnavmaps.pm, revision 1.311

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.311   ! albertel    4: # $Id: lonnavmaps.pm,v 1.310 2004/12/14 15:56:41 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();
1.305     albertel   36: use Apache::lonenc();
1.229     www        37: use Apache::lonlocal;
1.306     foxr       38: use Apache::lonnet;
1.73      bowersj2   39: use POSIX qw (floor strftime);
1.300     albertel   40: use Data::Dumper; # for debugging, not always 
1.2       www        41: 
1.133     bowersj2   42: # symbolic constants
                     43: sub SYMB { return 1; }
                     44: sub URL { return 2; }
                     45: sub NOTHING { return 3; }
                     46: 
                     47: # Some data
                     48: 
1.140     bowersj2   49: my $resObj = "Apache::lonnavmaps::resource";
                     50: 
1.135     bowersj2   51: # Keep these mappings in sync with lonquickgrades, which uses the colors
                     52: # instead of the icons.
                     53: my %statusIconMap = 
1.224     bowersj2   54:     (
                     55:      $resObj->CLOSED       => '',
                     56:      $resObj->OPEN         => 'navmap.open.gif',
                     57:      $resObj->CORRECT      => 'navmap.correct.gif',
                     58:      $resObj->INCORRECT    => 'navmap.wrong.gif',
                     59:      $resObj->ATTEMPTED    => 'navmap.ellipsis.gif',
                     60:      $resObj->ERROR        => ''
                     61:      );
1.135     bowersj2   62: 
                     63: my %iconAltTags = 
                     64:     ( 'navmap.correct.gif' => 'Correct',
                     65:       'navmap.wrong.gif'   => 'Incorrect',
                     66:       'navmap.open.gif'    => 'Open' );
1.133     bowersj2   67: 
1.136     bowersj2   68: # Defines a status->color mapping, null string means don't color
                     69: my %colormap = 
1.140     bowersj2   70:     ( $resObj->NETWORK_FAILURE        => '',
                     71:       $resObj->CORRECT                => '',
                     72:       $resObj->EXCUSED                => '#3333FF',
                     73:       $resObj->PAST_DUE_ANSWER_LATER  => '',
                     74:       $resObj->PAST_DUE_NO_ANSWER     => '',
                     75:       $resObj->ANSWER_OPEN            => '#006600',
                     76:       $resObj->OPEN_LATER             => '',
                     77:       $resObj->TRIES_LEFT             => '',
                     78:       $resObj->INCORRECT              => '',
                     79:       $resObj->OPEN                   => '',
1.207     bowersj2   80:       $resObj->NOTHING_SET            => '',
                     81:       $resObj->ATTEMPTED              => '',
                     82:       $resObj->ANSWER_SUBMITTED       => ''
                     83:       );
1.136     bowersj2   84: # And a special case in the nav map; what to do when the assignment
                     85: # is not yet done and due in less then 24 hours
                     86: my $hurryUpColor = "#FF0000";
1.130     www        87: 
1.268     albertel   88: sub launch_win {
1.281     albertel   89:     my ($mode,$script,$toplinkitems)=@_;
1.268     albertel   90:     my $result;
                     91:     if ($script ne 'no') {
                     92: 	$result.='<script type="text/javascript">';
                     93:     }
                     94:     $result.='function launch_navmapwin() {
                     95:                  newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
                     96:                }';
                     97:     if ($mode eq 'now') {
                     98: 	$result.="\nlaunch_navmapwin();\n";
                     99:     }
                    100:     if ($script ne 'no') {
                    101: 	$result.='</script>';
                    102:     }
                    103:     if ($mode eq 'link') {
1.281     albertel  104: 	&add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
                    105: 		      "Launch navigation window");
1.268     albertel  106:     }
                    107:     return $result;
                    108: }
                    109: 
1.269     albertel  110: sub close {
                    111:     if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
                    112:     return(<<ENDCLOSE);
                    113: <script type="text/javascript">
                    114: window.status='Accessing Nav Control';
                    115: menu=window.open("/adm/rat/empty.html","loncapanav",
                    116:                  "height=600,width=400,scrollbars=1");
                    117: window.status='Closing Nav Control';
                    118: menu.close();
                    119: window.status='Done.';
                    120: </script>
                    121: ENDCLOSE
                    122: }
1.268     albertel  123: 
1.270     albertel  124: sub update {
                    125:     if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
                    126:     if (!$ENV{'request.course.id'}) { return ''; }
                    127:     if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
                    128:     return(<<ENDUPDATE);
                    129: <form name="navform"></form>
                    130: <script type="text/javascript">
                    131: this.document.navform.action='/adm/navmaps#curloc';
                    132: this.document.navform.target='loncapanav';
                    133: this.document.navform.submit();
                    134: </script>
                    135: ENDUPDATE
                    136: }
1.268     albertel  137: 
1.1       www       138: sub handler {
1.99      bowersj2  139:     my $r = shift;
1.118     bowersj2  140:     real_handler($r);
                    141: }
                    142: 
                    143: sub real_handler {
                    144:     my $r = shift;
1.2       www       145: 
1.51      bowersj2  146:     # Handle header-only request
                    147:     if ($r->header_only) {
                    148:         if ($ENV{'browser.mathml'}) {
1.232     www       149:             &Apache::loncommon::content_type($r,'text/xml');
1.51      bowersj2  150:         } else {
1.232     www       151:             &Apache::loncommon::content_type($r,'text/html');
1.51      bowersj2  152:         }
                    153:         $r->send_http_header;
                    154:         return OK;
                    155:     }
                    156: 
                    157:     # Send header, don't cache this page
                    158:     if ($ENV{'browser.mathml'}) {
1.232     www       159:         &Apache::loncommon::content_type($r,'text/xml');
1.51      bowersj2  160:     } else {
1.232     www       161:         &Apache::loncommon::content_type($r,'text/html');
1.51      bowersj2  162:     }
                    163:     &Apache::loncommon::no_cache($r);
                    164:     $r->send_http_header;
                    165: 
1.281     albertel  166:     my %toplinkitems=();
                    167: 
1.268     albertel  168:     if ($ENV{QUERY_STRING} eq 'collapseExternal') {
                    169: 	&Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
                    170: 	&Apache::lonnet::appenv('environment.remotenavmap' => 'off');
1.275     albertel  171: 	my $menu=&Apache::lonmenu::reopenmenu();
                    172: 	my $navstatus=&Apache::lonmenu::get_nav_status();
                    173: 	if ($menu) {
                    174: 	    $menu=(<<MENU)
                    175:              swmenu=$menu
                    176:              swmenu.clearTimeout(swmenu.menucltim);
                    177: 	     $navstatus
                    178: MENU
1.280     albertel  179:         } else {
                    180: 	    my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
                    181: 	    my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
                    182: 	    $menu=(<<MENU)
                    183:              swmenu=$mainwindow
                    184: 	     $navstatus
                    185: MENU
1.275     albertel  186: 	}
1.268     albertel  187: 	$r->print(<<"ENDSUBM");
                    188: 	<html>
                    189:         <head>
                    190: 	  <script type="text/javascript">
                    191:  	    function submitthis() {
1.275     albertel  192: 		    $menu
1.268     albertel  193: 		    self.close();
                    194: 	    }
1.275     albertel  195: 	
1.268     albertel  196:   	  </script>
                    197:         </head>
                    198: 	<body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
                    199:         </html>
                    200: ENDSUBM
                    201:         return;
                    202:     }
                    203:     if ($ENV{QUERY_STRING} eq 'launchExternal') {
                    204: 	&Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
                    205: 	&Apache::lonnet::appenv('environment.remotenavmap' => 'on');
                    206:     }
                    207: 
1.106     bowersj2  208:     # Create the nav map
1.221     bowersj2  209:     my $navmap = Apache::lonnavmaps::navmap->new();
1.51      bowersj2  210: 
1.55      bowersj2  211:     if (!defined($navmap)) {
                    212:         my $requrl = $r->uri;
                    213:         $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
                    214:         return HTTP_NOT_ACCEPTABLE;
                    215:     }
1.64      bowersj2  216: 
1.111     bowersj2  217:     $r->print("<html><head>\n");
1.229     www       218:     $r->print("<title>".&mt('Navigate Course Contents')."</title>");
1.150     www       219: # ------------------------------------------------------------ Get query string
1.276     albertel  220:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework']);
1.158     bowersj2  221:     
1.150     www       222: # ----------------------------------------------------- Force menu registration
                    223:     my $addentries='';
1.268     albertel  224:     my $more_unload;
1.278     albertel  225:     my $body_only='';
1.268     albertel  226:     if ($ENV{'environment.remotenavmap'} eq 'on') {
                    227: 	$r->print('<script type="text/javascript">
                    228:                       function collapse() {
                    229:                          this.document.location="/adm/navmaps?collapseExternal";
                    230:                       }
                    231:                    </script>');
                    232: # FIXME need to be smarter to only catch window close events
                    233: #	$more_unload="collapse()"
1.278     albertel  234: 	$body_only=1;
1.268     albertel  235:     }
1.150     www       236:     if ($ENV{'form.register'}) {
1.268     albertel  237: 	$addentries=' onLoad="'.&Apache::lonmenu::loadevents().
                    238: 	    '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
                    239: 	    $more_unload.'"';
                    240: 	$r->print(&Apache::lonmenu::registerurl(1));
                    241:     } else {
                    242: 	$addentries=' onUnload="'.$more_unload.'"';
1.150     www       243:     }
1.111     bowersj2  244: 
1.64      bowersj2  245:     # Header
1.150     www       246:     $r->print('</head>'.
                    247:               &Apache::loncommon::bodytag('Navigate Course Contents','',
1.278     albertel  248: 					  $addentries,$body_only,'',
                    249: 					  $ENV{'form.register'}));
1.283     raeburn   250:     $r->print('<script>window.focus();</script>');
1.265     albertel  251:      
1.124     bowersj2  252:     $r->rflush();
                    253: 
1.55      bowersj2  254:     # Check that it's defined
                    255:     if (!($navmap->courseMapDefined())) {
1.283     raeburn   256: 	$r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
1.55      bowersj2  257:         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
                    258:                   '</body></html>');
                    259:         return OK;
                    260:     }
                    261: 
1.178     bowersj2  262:     # See if there's only one map in the top-level, if we don't
                    263:     # already have a filter... if so, automatically display it
1.222     bowersj2  264:     # (older code; should use retrieveResources)
1.179     bowersj2  265:     if ($ENV{QUERY_STRING} !~ /filter/) {
1.178     bowersj2  266:         my $iterator = $navmap->getIterator(undef, undef, undef, 0);
1.222     bowersj2  267:         my $curRes;
1.178     bowersj2  268:         my $sequenceCount = 0;
                    269:         my $sequenceId;
1.222     bowersj2  270:         while ($curRes = $iterator->next()) {
1.178     bowersj2  271:             if (ref($curRes) && $curRes->is_sequence()) {
                    272:                 $sequenceCount++;
                    273:                 $sequenceId = $curRes->map_pc();
1.179     bowersj2  274:             }
1.178     bowersj2  275:         }
                    276:         
                    277:         if ($sequenceCount == 1) {
                    278:             # The automatic iterator creation in the render call 
                    279:             # will pick this up. We know the condition because
                    280:             # the defined($ENV{'form.filter'}) also ensures this
                    281:             # is a fresh call.
                    282:             $ENV{'form.filter'} = "$sequenceId";
1.155     bowersj2  283:         }
                    284:     }
                    285: 
1.268     albertel  286:     if ($ENV{QUERY_STRING} eq 'launchExternal') {
                    287: 	$r->print('
                    288:           <form name="returnwin" action="/adm/flip?postdata=return%3a" 
                    289:                 method="post" target="loncapaclient">
                    290:           </form>');
                    291: 	$r->print('
                    292:           <script type="text/javascript">
                    293:               this.document.returnwin.submit();
                    294:           </script>');
                    295:     }
                    296: 
                    297:     if ($ENV{'environment.remotenavmap'} ne 'on') {
1.281     albertel  298: 	$r->print(&launch_win('link','yes',\%toplinkitems));
1.268     albertel  299:     } 
                    300:     if ($ENV{'environment.remotenavmap'} eq 'on') {
1.281     albertel  301: 	&add_linkitem(\%toplinkitems,'closenav','collapse()',
                    302: 		      "Close navigation window");
1.268     albertel  303:     } 
                    304: 
1.191     bowersj2  305:     my $jumpToFirstHomework = 0;
1.184     bowersj2  306:     # Check to see if the student is jumping to next open, do-able problem
1.281     albertel  307:     if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
1.191     bowersj2  308:         $jumpToFirstHomework = 1;
1.184     bowersj2  309:         # Find the next homework problem that they can do.
                    310:         my $iterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2  311:         my $curRes;
1.184     bowersj2  312:         my $foundDoableProblem = 0;
                    313:         my $problemRes;
                    314:         
1.222     bowersj2  315:         while (($curRes = $iterator->next()) && !$foundDoableProblem) {
1.184     bowersj2  316:             if (ref($curRes) && $curRes->is_problem()) {
                    317:                 my $status = $curRes->status();
1.191     bowersj2  318:                 if ($curRes->completable()) {
1.184     bowersj2  319:                     $problemRes = $curRes;
                    320:                     $foundDoableProblem = 1;
                    321: 
                    322:                     # Pop open all previous maps
                    323:                     my $stack = $iterator->getStack();
                    324:                     pop @$stack; # last resource in the stack is the problem
                    325:                                  # itself, which we don't need in the map stack
                    326:                     my @mapPcs = map {$_->map_pc()} @$stack;
                    327:                     $ENV{'form.filter'} = join(',', @mapPcs);
                    328: 
                    329:                     # Mark as both "here" and "jump"
                    330:                     $ENV{'form.postsymb'} = $curRes->symb();
                    331:                 }
                    332:             }
                    333:         }
                    334: 
                    335:         # If we found no problems, print a note to that effect.
                    336:         if (!$foundDoableProblem) {
                    337:             $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
                    338:         }
                    339:     } else {
1.281     albertel  340: 	&add_linkitem(\%toplinkitems,'firsthomework',
                    341: 		      'location.href="navmaps?jumpToFirstHomework"',
1.287     albertel  342: 		      "Show Me My First Homework Problem");
1.184     bowersj2  343:     }
                    344: 
1.191     bowersj2  345:     my $suppressEmptySequences = 0;
                    346:     my $filterFunc = undef;
1.201     bowersj2  347:     my $resource_no_folder_link = 0;
                    348: 
1.191     bowersj2  349:     # Display only due homework.
                    350:     my $showOnlyHomework = 0;
1.276     albertel  351:     if ($ENV{'form.showOnlyHomework'} eq "1") {
1.191     bowersj2  352:         $showOnlyHomework = 1;
                    353:         $suppressEmptySequences = 1;
                    354:         $filterFunc = sub { my $res = shift; 
1.201     bowersj2  355:                             return $res->completable() || $res->is_map();
1.191     bowersj2  356:                         };
1.281     albertel  357: 	&add_linkitem(\%toplinkitems,'everything',
1.296     albertel  358: 		     'location.href="navmaps?sort='.$ENV{'form.sort'}.'"',
1.281     albertel  359: 		      "Show Everything");
1.229     www       360:         $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
1.191     bowersj2  361:         $ENV{'form.filter'} = '';
                    362:         $ENV{'form.condition'} = 1;
1.201     bowersj2  363: 	$resource_no_folder_link = 1;
1.191     bowersj2  364:     } else {
1.281     albertel  365: 	&add_linkitem(\%toplinkitems,'uncompleted',
                    366: 		      'location.href="navmaps?sort='.$ENV{'form.sort'}.
                    367: 		          '&showOnlyHomework=1"',
                    368: 		      "Show Only Uncompleted Homework");
1.191     bowersj2  369:     }
                    370: 
1.276     albertel  371:     my %selected=($ENV{'form.sort'} => 'selected=on');
                    372:     my $sort_html=("<form>
1.270     albertel  373:                  <nobr>
1.276     albertel  374:                     <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$ENV{'form.showOnlyHomework'}."\" />
                    375:                     <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
1.270     albertel  376:                     <select name=\"sort\">
1.276     albertel  377:                        <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
                    378:                        <option value=\"title\"   $selected{'title'}  >".&mt('Title')."</option>
                    379:                        <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
1.307     raeburn   380:                        <option value=\"discussion\" $selected{'discussion'}>".&mt('Has New Discussion')."</option>
1.270     albertel  381:                     </select>
                    382:                  </nobr>
                    383:                </form>");
1.133     bowersj2  384:     # renderer call
1.285     albertel  385:     my $renderArgs = { 'cols' => [0,1,2,3],
1.270     albertel  386: 		       'sort' => $ENV{'form.sort'},
1.191     bowersj2  387:                        'url' => '/adm/navmaps',
                    388:                        'navmap' => $navmap,
                    389:                        'suppressNavmap' => 1,
                    390:                        'suppressEmptySequences' => $suppressEmptySequences,
                    391:                        'filterFunc' => $filterFunc,
1.201     bowersj2  392: 		       'resource_no_folder_link' => $resource_no_folder_link,
1.276     albertel  393: 		       'sort_html'=> $sort_html,
1.281     albertel  394:                        'r' => $r,
                    395:                        'caller' => 'navmapsdisplay',
                    396:                        'linkitems' => \%toplinkitems};
1.191     bowersj2  397:     my $render = render($renderArgs);
1.133     bowersj2  398: 
1.191     bowersj2  399:     # If no resources were printed, print a reassuring message so the
                    400:     # user knows there was no error.
                    401:     if ($renderArgs->{'counter'} == 0) {
                    402:         if ($showOnlyHomework) {
1.229     www       403:             $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
1.191     bowersj2  404:         } else { # both jumpToFirstHomework and normal use the same: course must be empty
                    405:             $r->print("<p><font size='+1'>This course is empty.</font></p>");
                    406:         }
                    407:     }
1.51      bowersj2  408: 
1.128     bowersj2  409:     $r->print("</body></html>");
1.134     bowersj2  410:     $r->rflush();
1.59      bowersj2  411: 
1.51      bowersj2  412:     return OK;
                    413: }
                    414: 
                    415: # Convenience functions: Returns a string that adds or subtracts
                    416: # the second argument from the first hash, appropriate for the 
                    417: # query string that determines which folders to recurse on
                    418: sub addToFilter {
                    419:     my $hashIn = shift;
                    420:     my $addition = shift;
                    421:     my %hash = %$hashIn;
                    422:     $hash{$addition} = 1;
                    423: 
                    424:     return join (",", keys(%hash));
                    425: }
                    426: 
                    427: sub removeFromFilter {
                    428:     my $hashIn = shift;
                    429:     my $subtraction = shift;
                    430:     my %hash = %$hashIn;
                    431: 
                    432:     delete $hash{$subtraction};
                    433:     return join(",", keys(%hash));
                    434: }
                    435: 
                    436: # Convenience function: Given a stack returned from getStack on the iterator,
                    437: # return the correct src() value.
                    438: sub getLinkForResource {
                    439:     my $stack = shift;
                    440:     my $res;
                    441: 
                    442:     # Check to see if there are any pages in the stack
                    443:     foreach $res (@$stack) {
1.248     www       444:         if (defined($res)) {
1.308     albertel  445: 	    my $anchor;
1.248     www       446: 	    if ($res->is_page()) {
1.308     albertel  447: 		foreach (@$stack) { if (defined($_)) { $anchor = $_; }  }
                    448: 		$anchor=&Apache::lonnet::escape($anchor->shown_symb());
                    449: 		return ($res->link(),$res->shown_symb(),$anchor);
1.248     www       450: 	    }
                    451:             # in case folder was skipped over as "only sequence"
                    452: 	    my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
                    453: 	    if ($map=~/\.page$/) {
1.308     albertel  454: 		my $url=&Apache::lonnet::clutter($map);
                    455: 		$anchor=&Apache::lonnet::escape($src->shown_symb());
                    456: 		return ($url,$res->shown_symb(),$anchor);
1.248     www       457: 	    }
1.51      bowersj2  458:         }
                    459:     }
                    460: 
                    461:     # Failing that, return the src of the last resource that is defined
                    462:     # (when we first recurse on a map, it puts an undefined resource
                    463:     # on the bottom because $self->{HERE} isn't defined yet, and we
                    464:     # want the src for the map anyhow)
                    465:     foreach (@$stack) {
                    466:         if (defined($_)) { $res = $_; }
                    467:     }
                    468: 
1.308     albertel  469:     return ($res->link(),$res->shown_symb());
1.51      bowersj2  470: }
                    471: 
1.251     www       472: # Convenience function: This separates the logic of how to create
1.53      bowersj2  473: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
1.251     www       474: # etc.) into a separate function. It takes a resource object as the
1.53      bowersj2  475: # first parameter, and the part number of the resource as the second.
                    476: # It's basically a big switch statement on the status of the resource.
                    477: 
                    478: sub getDescription {
                    479:     my $res = shift;
                    480:     my $part = shift;
1.69      bowersj2  481:     my $status = $res->status($part);
1.53      bowersj2  482: 
1.182     bowersj2  483:     if ($status == $res->NETWORK_FAILURE) { 
1.229     www       484:         return &mt("Having technical difficulties; please check status later"); 
1.182     bowersj2  485:     }
1.53      bowersj2  486:     if ($status == $res->NOTHING_SET) {
1.229     www       487:         return &mt("Not currently assigned.");
1.53      bowersj2  488:     }
                    489:     if ($status == $res->OPEN_LATER) {
1.73      bowersj2  490:         return "Open " . timeToHumanString($res->opendate($part));
1.53      bowersj2  491:     }
                    492:     if ($status == $res->OPEN) {
1.79      bowersj2  493:         if ($res->duedate($part)) {
1.229     www       494:             return &mt("Due")."  " .timeToHumanString($res->duedate($part));
1.66      bowersj2  495:         } else {
1.229     www       496:             return &mt("Open, no due date");
1.66      bowersj2  497:         }
1.53      bowersj2  498:     }
1.54      bowersj2  499:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.229     www       500:         return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
1.54      bowersj2  501:     }
                    502:     if ($status == $res->PAST_DUE_NO_ANSWER) {
1.229     www       503:         return &mt("Was due")." " . timeToHumanString($res->duedate($part));
1.53      bowersj2  504:     }
                    505:     if ($status == $res->ANSWER_OPEN) {
1.229     www       506:         return &mt("Answer available");
1.53      bowersj2  507:     }
1.59      bowersj2  508:     if ($status == $res->EXCUSED) {
1.229     www       509:         return &mt("Excused by instructor");
1.59      bowersj2  510:     }
1.69      bowersj2  511:     if ($status == $res->ATTEMPTED) {
1.229     www       512:         return &mt("Answer submitted, not yet graded");
1.69      bowersj2  513:     }
1.59      bowersj2  514:     if ($status == $res->TRIES_LEFT) {
1.79      bowersj2  515:         my $tries = $res->tries($part);
                    516:         my $maxtries = $res->maxtries($part);
                    517:         my $triesString = "";
                    518:         if ($tries && $maxtries) {
                    519:             $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
                    520:             if ($maxtries > 1 && $maxtries - $tries == 1) {
                    521:                 $triesString = "<b>$triesString</b>";
                    522:             }
                    523:         }
1.244     albertel  524:         if ($res->duedate($part)) {
1.229     www       525:             return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
1.66      bowersj2  526:                 " $triesString";
                    527:         } else {
1.229     www       528:             return &mt("No due date")." $triesString";
1.66      bowersj2  529:         }
1.59      bowersj2  530:     }
1.185     bowersj2  531:     if ($status == $res->ANSWER_SUBMITTED) {
1.229     www       532:         return &mt('Answer submitted');
1.185     bowersj2  533:     }
1.53      bowersj2  534: }
                    535: 
1.115     bowersj2  536: # Convenience function, so others can use it: Is the problem due in less then
                    537: # 24 hours, and still can be done?
                    538: 
1.252     matthew   539: sub dueInLessThan24Hours {
1.115     bowersj2  540:     my $res = shift;
                    541:     my $part = shift;
                    542:     my $status = $res->status($part);
                    543: 
1.207     bowersj2  544:     return ($status == $res->OPEN() ||
1.115     bowersj2  545:             $status == $res->TRIES_LEFT()) &&
1.244     albertel  546: 	    $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
                    547: 	    $res->duedate($part) > time();
1.115     bowersj2  548: }
                    549: 
                    550: # Convenience function, so others can use it: Is there only one try remaining for the
                    551: # part, with more then one try to begin with, not due yet and still can be done?
                    552: sub lastTry {
                    553:     my $res = shift;
                    554:     my $part = shift;
                    555: 
                    556:     my $tries = $res->tries($part);
                    557:     my $maxtries = $res->maxtries($part);
                    558:     return $tries && $maxtries && $maxtries > 1 &&
1.244     albertel  559:         $maxtries - $tries == 1 && $res->duedate($part) &&
                    560:         $res->duedate($part) > time();
1.115     bowersj2  561: }
                    562: 
1.101     bowersj2  563: # This puts a human-readable name on the ENV variable.
1.177     www       564: 
1.68      bowersj2  565: sub advancedUser {
1.177     www       566:     return $ENV{'request.role.adv'};
1.68      bowersj2  567: }
                    568: 
1.73      bowersj2  569: 
                    570: # timeToHumanString takes a time number and converts it to a
                    571: # human-readable representation, meant to be used in the following
                    572: # manner:
                    573: # print "Due $timestring"
                    574: # print "Open $timestring"
                    575: # print "Answer available $timestring"
                    576: # Very, very, very, VERY English-only... goodness help a localizer on
                    577: # this func...
1.53      bowersj2  578: sub timeToHumanString {
1.58      albertel  579:     my ($time) = @_;
                    580:     # zero, '0' and blank are bad times
1.73      bowersj2  581:     if (!$time) {
1.229     www       582:         return &mt('never');
1.73      bowersj2  583:     }
1.231     www       584:     unless (&Apache::lonlocal::current_language()=~/^en/) {
1.237     www       585: 	return &Apache::lonlocal::locallocaltime($time);
1.229     www       586:     } 
1.73      bowersj2  587:     my $now = time();
                    588: 
                    589:     my @time = localtime($time);
                    590:     my @now = localtime($now);
                    591: 
                    592:     # Positive = future
                    593:     my $delta = $time - $now;
                    594: 
                    595:     my $minute = 60;
                    596:     my $hour = 60 * $minute;
                    597:     my $day = 24 * $hour;
                    598:     my $week = 7 * $day;
                    599:     my $inPast = 0;
                    600: 
                    601:     # Logic in comments:
                    602:     # Is it now? (extremely unlikely)
                    603:     if ( $delta == 0 ) {
                    604:         return "this instant";
                    605:     }
                    606: 
                    607:     if ($delta < 0) {
                    608:         $inPast = 1;
                    609:         $delta = -$delta;
                    610:     }
                    611: 
                    612:     if ( $delta > 0 ) {
1.101     bowersj2  613: 
1.73      bowersj2  614:         my $tense = $inPast ? " ago" : "";
                    615:         my $prefix = $inPast ? "" : "in ";
1.101     bowersj2  616:         
                    617:         # Less then a minute
1.73      bowersj2  618:         if ( $delta < $minute ) {
                    619:             if ($delta == 1) { return "${prefix}1 second$tense"; }
                    620:             return "$prefix$delta seconds$tense";
                    621:         }
                    622: 
1.101     bowersj2  623:         # Less then an hour
1.73      bowersj2  624:         if ( $delta < $hour ) {
                    625:             # If so, use minutes
                    626:             my $minutes = floor($delta / 60);
                    627:             if ($minutes == 1) { return "${prefix}1 minute$tense"; }
                    628:             return "$prefix$minutes minutes$tense";
                    629:         }
                    630:         
                    631:         # Is it less then 24 hours away? If so,
                    632:         # display hours + minutes
                    633:         if ( $delta < $hour * 24) {
                    634:             my $hours = floor($delta / $hour);
                    635:             my $minutes = floor(($delta % $hour) / $minute);
                    636:             my $hourString = "$hours hours";
                    637:             my $minuteString = ", $minutes minutes";
                    638:             if ($hours == 1) {
                    639:                 $hourString = "1 hour";
                    640:             }
                    641:             if ($minutes == 1) {
                    642:                 $minuteString = ", 1 minute";
                    643:             }
                    644:             if ($minutes == 0) {
                    645:                 $minuteString = "";
                    646:             }
                    647:             return "$prefix$hourString$minuteString$tense";
                    648:         }
                    649: 
                    650:         # Less then 5 days away, display day of the week and
                    651:         # HH:MM
                    652:         if ( $delta < $day * 5 ) {
1.85      bowersj2  653:             my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.238     albertel  654:             $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  655:             $timeStr =~ s/12:00 pm/noon/;
                    656:             return ($inPast ? "last " : "next ") .
                    657:                 $timeStr;
                    658:         }
                    659:         
                    660:         # Is it this year?
                    661:         if ( $time[5] == $now[5]) {
                    662:             # Return on Month Day, HH:MM meridian
                    663:             my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
1.238     albertel  664:             $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  665:             $timeStr =~ s/12:00 pm/noon/;
                    666:             return $timeStr;
                    667:         }
                    668: 
                    669:         # Not this year, so show the year
1.279     albertel  670:         my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
1.238     albertel  671:         $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  672:         $timeStr =~ s/12:00 pm/noon/;
                    673:         return $timeStr;
1.58      albertel  674:     }
1.53      bowersj2  675: }
                    676: 
1.51      bowersj2  677: 
1.133     bowersj2  678: =pod
                    679: 
1.174     albertel  680: =head1 NAME
                    681: 
1.217     bowersj2  682: Apache::lonnavmap - Subroutines to handle and render the navigation
                    683:     maps
1.174     albertel  684: 
                    685: =head1 SYNOPSIS
                    686: 
                    687: The main handler generates the navigational listing for the course,
                    688: the other objects export this information in a usable fashion for
1.205     bowersj2  689: other modules.
1.133     bowersj2  690: 
1.216     bowersj2  691: =head1 OVERVIEW
                    692: 
1.217     bowersj2  693: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.218     bowersj2  694: course structure and caches it in what is often referred to as the
                    695: "big hash" X<big hash>. You can see it if you are logged into
                    696: LON-CAPA, in a course, by going to /adm/test. (You may need to
                    697: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
                    698: content of the hash will be under the heading "Big Hash".
1.216     bowersj2  699: 
                    700: Big Hash contains, among other things, how resources are related
                    701: to each other (next/previous), what resources are maps, which 
                    702: resources are being chosen to not show to the student (for random
                    703: selection), and a lot of other things that can take a lot of time
                    704: to compute due to the amount of data that needs to be collected and
                    705: processed.
                    706: 
                    707: Apache::lonnavmaps provides an object model for manipulating this
                    708: information in a higher-level fashion then directly manipulating 
                    709: the hash. It also provides access to several auxilary functions 
                    710: that aren't necessarily stored in the Big Hash, but are a per-
                    711: resource sort of value, like whether there is any feedback on 
                    712: a given resource.
                    713: 
                    714: Apache::lonnavmaps also abstracts away branching, and someday, 
                    715: conditions, for the times where you don't really care about those
                    716: things.
                    717: 
                    718: Apache::lonnavmaps also provides fairly powerful routines for
                    719: rendering navmaps, and last but not least, provides the navmaps
                    720: view for when the user clicks the NAV button.
                    721: 
                    722: B<Note>: Apache::lonnavmaps I<only> works for the "currently
                    723: logged in user"; if you want things like "due dates for another
                    724: student" lonnavmaps can not directly retrieve information like
                    725: that. You need the EXT function. This module can still help,
                    726: because many things, such as the course structure, are constant
                    727: between users, and Apache::lonnavmaps can help by providing
                    728: symbs for the EXT call.
                    729: 
                    730: The rest of this file will cover the provided rendering routines, 
                    731: which can often be used without fiddling with the navmap object at
                    732: all, then documents the Apache::lonnavmaps::navmap object, which
                    733: is the key to accessing the Big Hash information, covers the use
                    734: of the Iterator (which provides the logic for traversing the 
                    735: somewhat-complicated Big Hash data structure), documents the
                    736: Apache::lonnavmaps::Resource objects that are returned by 
                    737: 
1.205     bowersj2  738: =head1 Subroutine: render
1.133     bowersj2  739: 
1.174     albertel  740: The navmap renderer package provides a sophisticated rendering of the
                    741: standard navigation maps interface into HTML. The provided nav map
                    742: handler is actually just a glorified call to this.
1.133     bowersj2  743: 
1.216     bowersj2  744: Because of the large number of parameters this function accepts,
1.174     albertel  745: instead of passing it arguments as is normal, pass it in an anonymous
1.216     bowersj2  746: hash with the desired options.
1.174     albertel  747: 
                    748: The package provides a function called 'render', called as
1.205     bowersj2  749: Apache::lonnavmaps::render({}).
1.51      bowersj2  750: 
1.133     bowersj2  751: =head2 Overview of Columns
1.51      bowersj2  752: 
1.174     albertel  753: The renderer will build an HTML table for the navmap and return
                    754: it. The table is consists of several columns, and a row for each
                    755: resource (or possibly each part). You tell the renderer how many
                    756: columns to create and what to place in each column, optionally using
1.205     bowersj2  757: one or more of the prepared columns, and the renderer will assemble
1.174     albertel  758: the table.
                    759: 
                    760: Any additional generally useful column types should be placed in the
                    761: renderer code here, so anybody can use it anywhere else. Any code
                    762: specific to the current application (such as the addition of <input>
                    763: elements in a column) should be placed in the code of the thing using
                    764: the renderer.
                    765: 
                    766: At the core of the renderer is the array reference COLS (see Example
                    767: section below for how to pass this correctly). The COLS array will
                    768: consist of entries of one of two types of things: Either an integer
                    769: representing one of the pre-packaged column types, or a sub reference
                    770: that takes a resource reference, a part number, and a reference to the
                    771: argument hash passed to the renderer, and returns a string that will
                    772: be inserted into the HTML representation as it.
                    773: 
1.216     bowersj2  774: All other parameters are ways of either changing how the columns
                    775: are printing, or which rows are shown.
                    776: 
1.174     albertel  777: The pre-packaged column names are refered to by constants in the
1.205     bowersj2  778: Apache::lonnavmaps namespace. The following currently exist:
1.51      bowersj2  779: 
1.174     albertel  780: =over 4
1.51      bowersj2  781: 
1.216     bowersj2  782: =item * B<Apache::lonnavmaps::resource>:
1.51      bowersj2  783: 
1.174     albertel  784: The general info about the resource: Link, icon for the type, etc. The
1.216     bowersj2  785: first column in the standard nav map display. This column provides the
                    786: indentation effect seen in the B<NAV> screen. This column also accepts
1.205     bowersj2  787: the following parameters in the renderer hash:
1.51      bowersj2  788: 
1.133     bowersj2  789: =over 4
1.51      bowersj2  790: 
1.216     bowersj2  791: =item * B<resource_nolink>: default false
1.51      bowersj2  792: 
1.216     bowersj2  793: If true, the resource will not be linked. By default, all non-folder
                    794: resources are linked.
1.174     albertel  795: 
1.216     bowersj2  796: =item * B<resource_part_count>: default true
1.51      bowersj2  797: 
1.216     bowersj2  798: If true, the resource will show a part count B<if> the full
                    799: part list is not displayed. (See "condense_parts" later.) If false,
                    800: the resource will never show a part count.
1.133     bowersj2  801: 
1.174     albertel  802: =item * B<resource_no_folder_link>:
1.133     bowersj2  803: 
1.174     albertel  804: If true, the resource's folder will not be clickable to open or close
                    805: it. Default is false. True implies printCloseAll is false, since you
                    806: can't close or open folders when this is on anyhow.
1.144     bowersj2  807: 
1.133     bowersj2  808: =back
1.51      bowersj2  809: 
1.225     bowersj2  810: =item * B<Apache::lonnavmaps::communication_status>:
1.174     albertel  811: 
                    812: Whether there is discussion on the resource, email for the user, or
                    813: (lumped in here) perl errors in the execution of the problem. This is
                    814: the second column in the main nav map.
                    815: 
1.225     bowersj2  816: =item * B<Apache::lonnavmaps::quick_status>:
1.51      bowersj2  817: 
1.216     bowersj2  818: An icon for the status of a problem, with five possible states:
                    819: Correct, incorrect, open, awaiting grading (for a problem where the
                    820: computer's grade is suppressed, or the computer can't grade, like
                    821: essay problem), or none (not open yet, not a problem). The
1.174     albertel  822: third column of the standard navmap.
1.51      bowersj2  823: 
1.225     bowersj2  824: =item * B<Apache::lonnavmaps::long_status>:
1.174     albertel  825: 
                    826: A text readout of the details of the current status of the problem,
                    827: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51      bowersj2  828: 
1.225     bowersj2  829: =item * B<Apache::lonnavmaps::part_status_summary>:
                    830: 
                    831: A text readout summarizing the status of the problem. If it is a
                    832: single part problem, will display "Correct", "Incorrect", 
                    833: "Not yet open", "Open", "Attempted", or "Error". If there are
                    834: multiple parts, this will output a string that in HTML will show a
                    835: status of how many parts are in each status, in color coding, trying
                    836: to match the colors of the icons within reason.
                    837: 
                    838: Note this only makes sense if you are I<not> showing parts. If 
                    839: C<showParts> is true (see below), this column will not output
                    840: anything. 
                    841: 
1.133     bowersj2  842: =back
1.51      bowersj2  843: 
1.133     bowersj2  844: If you add any others please be sure to document them here.
1.51      bowersj2  845: 
1.174     albertel  846: An example of a column renderer that will show the ID number of a
                    847: resource, along with the part name if any:
1.51      bowersj2  848: 
1.133     bowersj2  849:  sub { 
                    850:   my ($resource, $part, $params) = @_;   
                    851:   if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
                    852:   return '<td>' . $resource->{ID} . '</td>';
                    853:  }
1.51      bowersj2  854: 
1.174     albertel  855: Note these functions are responsible for the TD tags, which allow them
                    856: to override vertical and horizontal alignment, etc.
1.130     www       857: 
1.133     bowersj2  858: =head2 Parameters
1.115     bowersj2  859: 
1.217     bowersj2  860: Minimally, you should be
1.174     albertel  861: able to get away with just using 'cols' (to specify the columns
                    862: shown), 'url' (necessary for the folders to link to the current screen
                    863: correctly), and possibly 'queryString' if your app calls for it. In
                    864: that case, maintaining the state of the folders will be done
                    865: automatically.
1.140     bowersj2  866: 
1.133     bowersj2  867: =over 4
1.51      bowersj2  868: 
1.216     bowersj2  869: =item * B<iterator>: default: constructs one from %ENV
1.174     albertel  870: 
                    871: A reference to a fresh ::iterator to use from the navmaps. The
                    872: rendering will reflect the options passed to the iterator, so you can
                    873: use that to just render a certain part of the course, if you like. If
                    874: one is not passed, the renderer will attempt to construct one from
                    875: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
                    876: 'iterator_map' parameter if any.
                    877: 
1.216     bowersj2  878: =item * B<iterator_map>: default: not used
1.174     albertel  879: 
                    880: If you are letting the renderer do the iterator handling, you can
                    881: instruct the renderer to render only a particular map by passing it
                    882: the source of the map you want to process, like
                    883: '/res/103/jerf/navmap.course.sequence'.
                    884: 
1.216     bowersj2  885: =item * B<navmap>: default: constructs one from %ENV
1.174     albertel  886: 
                    887: A reference to a navmap, used only if an iterator is not passed in. If
                    888: this is necessary to make an iterator but it is not passed in, a new
                    889: one will be constructed based on ENV info. This is useful to do basic
                    890: error checking before passing it off to render.
                    891: 
1.216     bowersj2  892: =item * B<r>: default: must be passed in
1.174     albertel  893: 
                    894: The standard Apache response object. This must be passed to the
                    895: renderer or the course hash will be locked.
                    896: 
1.216     bowersj2  897: =item * B<cols>: default: empty (useless)
1.174     albertel  898: 
                    899: An array reference
                    900: 
1.216     bowersj2  901: =item * B<showParts>:default true
1.174     albertel  902: 
1.216     bowersj2  903: A flag. If true, a line for the resource itself, and a line
1.174     albertel  904: for each part will be displayed. If not, only one line for each
                    905: resource will be displayed.
                    906: 
1.216     bowersj2  907: =item * B<condenseParts>: default true
1.174     albertel  908: 
1.216     bowersj2  909: A flag. If true, if all parts of the problem have the same
1.174     albertel  910: status and that status is Nothing Set, Correct, or Network Failure,
                    911: then only one line will be displayed for that resource anyhow. If no,
                    912: all parts will always be displayed. If showParts is 0, this is
                    913: ignored.
                    914: 
1.216     bowersj2  915: =item * B<jumpCount>: default: determined from %ENV
1.174     albertel  916: 
1.216     bowersj2  917: A string identifying the URL to place the anchor 'curloc' at.
                    918: It is the responsibility of the renderer user to
1.174     albertel  919: ensure that the #curloc is in the URL. By default, determined through
                    920: the use of the ENV{} 'jump' information, and should normally "just
                    921: work" correctly.
1.144     bowersj2  922: 
1.216     bowersj2  923: =item * B<here>: default: empty string
1.140     bowersj2  924: 
1.216     bowersj2  925: A Symb identifying where to place the 'here' marker. The empty
                    926: string means no marker.
1.92      bowersj2  927: 
1.216     bowersj2  928: =item * B<indentString>: default: 25 pixel whitespace image
1.164     bowersj2  929: 
1.216     bowersj2  930: A string identifying the indentation string to use. 
1.92      bowersj2  931: 
1.216     bowersj2  932: =item * B<queryString>: default: empty
1.51      bowersj2  933: 
1.174     albertel  934: A string which will be prepended to the query string used when the
1.216     bowersj2  935: folders are opened or closed. You can use this to pass
                    936: application-specific values.
1.55      bowersj2  937: 
1.216     bowersj2  938: =item * B<url>: default: none
1.84      bowersj2  939: 
1.174     albertel  940: The url the folders will link to, which should be the current
1.216     bowersj2  941: page. Required if the resource info column is shown, and you 
                    942: are allowing the user to open and close folders.
1.115     bowersj2  943: 
1.216     bowersj2  944: =item * B<currentJumpIndex>: default: no jumping
1.55      bowersj2  945: 
1.174     albertel  946: Describes the currently-open row number to cause the browser to jump
                    947: to, because the user just opened that folder. By default, pulled from
                    948: the Jump information in the ENV{'form.*'}.
1.51      bowersj2  949: 
1.216     bowersj2  950: =item * B<printKey>: default: false
1.51      bowersj2  951: 
1.174     albertel  952: If true, print the key that appears on the top of the standard
1.216     bowersj2  953: navmaps.
1.139     bowersj2  954: 
1.216     bowersj2  955: =item * B<printCloseAll>: default: true
1.140     bowersj2  956: 
1.174     albertel  957: If true, print the "Close all folders" or "open all folders"
1.216     bowersj2  958: links.
1.140     bowersj2  959: 
1.216     bowersj2  960: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.153     bowersj2  961: 
1.174     albertel  962: A function that takes the resource object as its only parameter and
                    963: returns a true or false value. If true, the resource is displayed. If
1.216     bowersj2  964: false, it is simply skipped in the display.
1.174     albertel  965: 
1.216     bowersj2  966: =item * B<suppressEmptySequences>: default: false
1.190     bowersj2  967: 
                    968: If you're using a filter function, and displaying sequences to orient
                    969: the user, then frequently some sequences will be empty. Setting this to
                    970: true will cause those sequences not to display, so as not to confuse the
                    971: user into thinking that if the sequence is there there should be things
1.216     bowersj2  972: under it; for example, see the "Show Uncompleted Homework" view on the
                    973: B<NAV> screen.
1.190     bowersj2  974: 
1.216     bowersj2  975: =item * B<suppressNavmaps>: default: false
1.174     albertel  976: 
1.216     bowersj2  977: If true, will not display Navigate Content resources. 
1.143     bowersj2  978: 
1.133     bowersj2  979: =back
1.51      bowersj2  980: 
1.133     bowersj2  981: =head2 Additional Info
1.51      bowersj2  982: 
1.174     albertel  983: In addition to the parameters you can pass to the renderer, which will
                    984: be passed through unchange to the column renderers, the renderer will
                    985: generate the following information which your renderer may find
                    986: useful:
                    987: 
1.216     bowersj2  988: =over 4
                    989: 
                    990: =item * B<counter>: 
1.145     bowersj2  991: 
1.216     bowersj2  992: Contains the number of rows printed. Useful after calling the render 
                    993: function, as you can detect whether anything was printed at all.
                    994: 
                    995: =item * B<isNewBranch>:
                    996: 
                    997: Useful for renderers: If this resource is currently the first resource
                    998: of a new branch, this will be true. The Resource column (leftmost in the
                    999: navmaps screen) uses this to display the "new branch" icon 
1.59      bowersj2 1000: 
1.133     bowersj2 1001: =back
1.59      bowersj2 1002: 
1.133     bowersj2 1003: =cut
1.59      bowersj2 1004: 
1.133     bowersj2 1005: sub resource { return 0; }
                   1006: sub communication_status { return 1; }
                   1007: sub quick_status { return 2; }
                   1008: sub long_status { return 3; }
1.225     bowersj2 1009: sub part_status_summary { return 4; }
1.51      bowersj2 1010: 
1.133     bowersj2 1011: sub render_resource {
                   1012:     my ($resource, $part, $params) = @_;
1.51      bowersj2 1013: 
1.133     bowersj2 1014:     my $nonLinkedText = ''; # stuff after resource title not in link
1.51      bowersj2 1015: 
1.134     bowersj2 1016:     my $link = $params->{"resourceLink"};
1.306     foxr     1017: 
                   1018:     #  The URL part is not escaped at this point, but the symb is... 
                   1019:     #  The stuff to the left of the ? must have ' replaced by \' since
                   1020:     #  it will be quoted with ' in the href.
                   1021: 
                   1022:     my ($left,$right) = split(/\?/, $link);
                   1023:     $left =~ s/'/\\'/g;
                   1024:     $link = $left.'?'.$right;
                   1025: 
1.134     bowersj2 1026:     my $src = $resource->src();
                   1027:     my $it = $params->{"iterator"};
1.133     bowersj2 1028:     my $filter = $it->{FILTER};
                   1029: 
                   1030:     my $title = $resource->compTitle();
1.258     albertel 1031: 
1.133     bowersj2 1032:     my $partLabel = "";
                   1033:     my $newBranchText = "";
1.298     albertel 1034:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1.133     bowersj2 1035:     # If this is a new branch, label it so
                   1036:     if ($params->{'isNewBranch'}) {
1.298     albertel 1037:         $newBranchText = "<img src='$location/branch.gif' border='0' />";
1.51      bowersj2 1038:     }
                   1039: 
1.133     bowersj2 1040:     # links to open and close the folder
1.306     foxr     1041: 
                   1042:     
1.133     bowersj2 1043:     my $linkopen = "<a href='$link'>";
1.306     foxr     1044: 
                   1045: 
1.133     bowersj2 1046:     my $linkclose = "</a>";
1.51      bowersj2 1047: 
1.204     albertel 1048:     # Default icon: unknown page
1.298     albertel 1049:     my $icon = "<img src='$location/unknown.gif' alt='' border='0' />";
1.133     bowersj2 1050:     
                   1051:     if ($resource->is_problem()) {
1.192     bowersj2 1052:         if ($part eq '0' || $params->{'condensed'}) {
1.298     albertel 1053:             $icon ='<img src="'.$location.'/problem.gif" alt="" border="0" />';
1.133     bowersj2 1054:         } else {
                   1055:             $icon = $params->{'indentString'};
                   1056:         }
1.204     albertel 1057:     } else {
1.298     albertel 1058: 	$icon = "<img src='".&Apache::loncommon::lonhttpdurl(&Apache::loncommon::icon($resource->src))."' 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';
1.298     albertel 1073:             $icon = "<img src='$location/$icon' alt='' border='0' />";
1.144     bowersj2 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'>";
1.306     foxr     1086: 
1.144     bowersj2 1087:         } else {
                   1088:             # Don't allow users to manipulate folder
1.205     bowersj2 1089:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1.144     bowersj2 1090:                 '.nomanip.gif';
1.298     albertel 1091:             $icon = "<img src='$location/$icon' alt='' border='0' />";
1.144     bowersj2 1092: 
                   1093:             $linkopen = "";
                   1094:             $linkclose = "";
                   1095:         }
1.133     bowersj2 1096:     }
1.51      bowersj2 1097: 
1.133     bowersj2 1098:     if ($resource->randomout()) {
                   1099:         $nonLinkedText .= ' <i>(hidden)</i> ';
                   1100:     }
                   1101:     
                   1102:     # We're done preparing and finally ready to start the rendering
                   1103:     my $result = "<td align='left' valign='center'>";
1.140     bowersj2 1104: 
                   1105:     my $indentLevel = $params->{'indentLevel'};
                   1106:     if ($newBranchText) { $indentLevel--; }
                   1107: 
1.133     bowersj2 1108:     # print indentation
1.140     bowersj2 1109:     for (my $i = 0; $i < $indentLevel; $i++) {
1.133     bowersj2 1110:         $result .= $params->{'indentString'};
1.84      bowersj2 1111:     }
                   1112: 
1.133     bowersj2 1113:     # Decide what to display
1.306     foxr     1114: 
1.133     bowersj2 1115:     $result .= "$newBranchText$linkopen$icon$linkclose";
                   1116:     
                   1117:     my $curMarkerBegin = '';
                   1118:     my $curMarkerEnd = '';
1.51      bowersj2 1119: 
1.133     bowersj2 1120:     # Is this the current resource?
1.158     bowersj2 1121:     if (!$params->{'displayedHereMarker'} && 
                   1122:         $resource->symb() eq $params->{'here'} ) {
1.133     bowersj2 1123:         $curMarkerBegin = '<font color="red" size="+2">&gt; </font>';
                   1124:         $curMarkerEnd = '<font color="red" size="+2">&lt;</font>';
1.158     bowersj2 1125:         $params->{'displayedHereMarker'} = 1;
1.51      bowersj2 1126:     }
                   1127: 
1.192     bowersj2 1128:     if ($resource->is_problem() && $part ne '0' && 
1.133     bowersj2 1129:         !$params->{'condensed'}) {
1.274     matthew  1130: 	my $displaypart=$resource->part_display($part);
1.245     www      1131:         $partLabel = " (Part: $displaypart)";
1.309     albertel 1132: 	if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1.133     bowersj2 1133:         $title = "";
1.51      bowersj2 1134:     }
                   1135: 
1.163     bowersj2 1136:     if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133     bowersj2 1137:         $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51      bowersj2 1138:     }
                   1139: 
1.268     albertel 1140:     my $target;
                   1141:     if ($ENV{'environment.remotenavmap'} eq 'on') {
                   1142: 	$target=' target="loncapaclient" ';
                   1143:     }
1.266     raeburn  1144:     if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1.268     albertel 1145:         $result .= "  $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1.144     bowersj2 1146:     } else {
                   1147:         $result .= "  $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
                   1148:     }
1.51      bowersj2 1149: 
1.133     bowersj2 1150:     return $result;
                   1151: }
1.51      bowersj2 1152: 
1.133     bowersj2 1153: sub render_communication_status {
                   1154:     my ($resource, $part, $params) = @_;
1.134     bowersj2 1155:     my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
                   1156: 
                   1157:     my $link = $params->{"resourceLink"};
                   1158:     my $linkopen = "<a href='$link'>";
                   1159:     my $linkclose = "</a>";
1.298     albertel 1160:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.134     bowersj2 1161:     if ($resource->hasDiscussion()) {
                   1162:         $discussionHTML = $linkopen .
1.298     albertel 1163:             '<img border="0" src="'.$location.'/chat.gif" />' .
1.134     bowersj2 1164:             $linkclose;
                   1165:     }
                   1166:     
                   1167:     if ($resource->getFeedback()) {
                   1168:         my $feedback = $resource->getFeedback();
                   1169:         foreach (split(/\,/, $feedback)) {
                   1170:             if ($_) {
                   1171:                 $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
                   1172:                     . &Apache::lonnet::escape($_) . '">'
1.298     albertel 1173:                     . '<img src="'.$location.'/feedback.gif" '
1.134     bowersj2 1174:                     . 'border="0" /></a>';
                   1175:             }
                   1176:         }
                   1177:     }
                   1178:     
                   1179:     if ($resource->getErrors()) {
                   1180:         my $errors = $resource->getErrors();
1.254     matthew  1181:         my $errorcount = 0;
1.134     bowersj2 1182:         foreach (split(/,/, $errors)) {
1.254     matthew  1183:             last if ($errorcount>=10); # Only output 10 bombs maximum
1.134     bowersj2 1184:             if ($_) {
1.254     matthew  1185:                 $errorcount++;
1.134     bowersj2 1186:                 $errorHTML .= '&nbsp;<a href="/adm/email?display='
                   1187:                     . &Apache::lonnet::escape($_) . '">'
1.298     albertel 1188:                     . '<img src="'.$location.'/bomb.gif" '
1.134     bowersj2 1189:                     . 'border="0" /></a>';
                   1190:             }
                   1191:         }
1.197     bowersj2 1192:     }
                   1193: 
                   1194:     if ($params->{'multipart'} && $part != '0') {
                   1195: 	$discussionHTML = $feedbackHTML = $errorHTML = '';
1.134     bowersj2 1196:     }
                   1197: 
                   1198:     return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
                   1199: 
1.133     bowersj2 1200: }
                   1201: sub render_quick_status {
                   1202:     my ($resource, $part, $params) = @_;
1.135     bowersj2 1203:     my $result = "";
                   1204:     my $firstDisplayed = !$params->{'condensed'} && 
                   1205:         $params->{'multipart'} && $part eq "0";
                   1206: 
                   1207:     my $link = $params->{"resourceLink"};
                   1208:     my $linkopen = "<a href='$link'>";
                   1209:     my $linkclose = "</a>";
                   1210: 
                   1211:     if ($resource->is_problem() &&
                   1212:         !$firstDisplayed) {
1.224     bowersj2 1213: 	
                   1214:         my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135     bowersj2 1215:         my $alt = $iconAltTags{$icon};
                   1216:         if ($icon) {
1.298     albertel 1217: 	    my $location=
                   1218: 		&Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
                   1219:             $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1.135     bowersj2 1220:         } else {
                   1221:             $result .= "<td width='30'>&nbsp;</td>\n";
                   1222:         }
                   1223:     } else { # not problem, no icon
                   1224:         $result .= "<td width='30'>&nbsp;</td>\n";
                   1225:     }
                   1226: 
                   1227:     return $result;
1.133     bowersj2 1228: }
                   1229: sub render_long_status {
                   1230:     my ($resource, $part, $params) = @_;
1.136     bowersj2 1231:     my $result = "<td align='right' valign='center'>\n";
                   1232:     my $firstDisplayed = !$params->{'condensed'} && 
                   1233:         $params->{'multipart'} && $part eq "0";
                   1234:                 
                   1235:     my $color;
1.212     bowersj2 1236:     if ($resource->is_problem()) {
1.136     bowersj2 1237:         $color = $colormap{$resource->status};
                   1238:         
1.252     matthew  1239:         if (dueInLessThan24Hours($resource, $part) ||
1.136     bowersj2 1240:             lastTry($resource, $part)) {
                   1241:             $color = $hurryUpColor;
                   1242:         }
                   1243:     }
                   1244:     
                   1245:     if ($resource->kind() eq "res" &&
                   1246:         $resource->is_problem() &&
                   1247:         !$firstDisplayed) {
                   1248:         if ($color) {$result .= "<font color=\"$color\"><b>"; }
                   1249:         $result .= getDescription($resource, $part);
                   1250:         if ($color) {$result .= "</b></font>"; }
                   1251:     }
                   1252:     if ($resource->is_map() && advancedUser() && $resource->randompick()) {
                   1253:         $result .= '(randomly select ' . $resource->randompick() .')';
                   1254:     }
1.210     bowersj2 1255: 
1.213     bowersj2 1256:     # Debugging code
                   1257:     #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
                   1258:     #	' - Part: ' . $part;
                   1259: 
1.210     bowersj2 1260:     $result .= "</td>\n";
1.136     bowersj2 1261:     
                   1262:     return $result;
1.51      bowersj2 1263: }
                   1264: 
1.227     bowersj2 1265: # Colors obtained by taking the icons, matching the colors, and
                   1266: # possibly reducing the Value (HSV) of the color, if it's too bright
                   1267: # for text, generally by one third or so.
1.225     bowersj2 1268: my %statusColors = 
                   1269:     (
                   1270:      $resObj->CLOSED => '#000000',
1.227     bowersj2 1271:      $resObj->OPEN   => '#998b13',
                   1272:      $resObj->CORRECT => '#26933f',
                   1273:      $resObj->INCORRECT => '#c48207',
                   1274:      $resObj->ATTEMPTED => '#a87510',
1.225     bowersj2 1275:      $resObj->ERROR => '#000000'
                   1276:      );
                   1277: my %statusStrings = 
                   1278:     (
                   1279:      $resObj->CLOSED => 'Not yet open',
                   1280:      $resObj->OPEN   => 'Open',
                   1281:      $resObj->CORRECT => 'Correct',
                   1282:      $resObj->INCORRECT => 'Incorrect',
                   1283:      $resObj->ATTEMPTED => 'Attempted',
                   1284:      $resObj->ERROR => 'Network Error'
                   1285:      );
                   1286: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
                   1287: 
                   1288: use Data::Dumper;
                   1289: sub render_parts_summary_status {
                   1290:     my ($resource, $part, $params) = @_;
1.256     albertel 1291:     if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1.225     bowersj2 1292:     if ($params->{showParts}) { 
                   1293: 	return '<td></td>';
                   1294:     }
                   1295: 
                   1296:     my $td = "<td align='right'>\n";
                   1297:     my $endtd = "</td>\n";
1.256     albertel 1298:     my @probs;
1.225     bowersj2 1299: 
1.256     albertel 1300:     if ($resource->contains_problem) {
                   1301: 	@probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
                   1302:     } else {
                   1303: 	@probs=($resource);
                   1304:     }
                   1305:     my $return;
                   1306:     my %overallstatus;
                   1307:     my $totalParts;
                   1308:     foreach my $resource (@probs) {
                   1309: 	# If there is a single part, just show the simple status
                   1310: 	if ($resource->singlepart()) {
                   1311: 	    my $status = $resource->simpleStatus(${$resource->parts}[0]);
                   1312: 	    $overallstatus{$status}++;
                   1313: 	    $totalParts++;
                   1314: 	    next;
                   1315: 	}
                   1316: 	# Now we can be sure the $part doesn't really matter.
                   1317: 	my $statusCount = $resource->simpleStatusCount();
                   1318: 	my @counts;
                   1319: 	foreach my $status (@statuses) {
                   1320: 	    # decouple display order from the simpleStatusCount order
                   1321: 	    my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
                   1322: 	    if ($statusCount->[$slot]) {
                   1323: 		$overallstatus{$status}+=$statusCount->[$slot];
                   1324: 		$totalParts+=$statusCount->[$slot];
                   1325: 	    }
                   1326: 	}
                   1327:     }
                   1328:     $return.= $td . $totalParts . ' parts: ';
                   1329:     foreach my $status (@statuses) {
                   1330: 	if ($overallstatus{$status}) {
                   1331: 	    $return.="<font color='" . $statusColors{$status} .
                   1332: 		"'>" . $overallstatus{$status} . ' '
1.225     bowersj2 1333: 		. $statusStrings{$status} . "</font>";
                   1334: 	}
                   1335:     }
1.256     albertel 1336:     $return.= $endtd;
                   1337:     return $return;
1.225     bowersj2 1338: }
                   1339: 
1.133     bowersj2 1340: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225     bowersj2 1341:                        \&render_quick_status, \&render_long_status,
                   1342: 		       \&render_parts_summary_status);
1.132     bowersj2 1343: 
                   1344: sub setDefault {
                   1345:     my ($val, $default) = @_;
                   1346:     if (!defined($val)) { return $default; }
                   1347:     return $val;
                   1348: }
                   1349: 
1.296     albertel 1350: sub cmp_title {
                   1351:     my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
                   1352:     $atitle=~s/^\s*//;
                   1353:     $btitle=~s/^\s*//;
                   1354:     return $atitle cmp $btitle;
                   1355: }
                   1356: 
1.132     bowersj2 1357: sub render {
                   1358:     my $args = shift;
1.140     bowersj2 1359:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                   1360:     my $result = '';
1.132     bowersj2 1361:     # Configure the renderer.
                   1362:     my $cols = $args->{'cols'};
                   1363:     if (!defined($cols)) {
                   1364:         # no columns, no nav maps.
                   1365:         return '';
                   1366:     }
1.140     bowersj2 1367:     my $mustCloseNavMap = 0;
                   1368:     my $navmap;
                   1369:     if (defined($args->{'navmap'})) {
                   1370:         $navmap = $args->{'navmap'};
                   1371:     }
                   1372: 
1.158     bowersj2 1373:     my $r = $args->{'r'};
1.140     bowersj2 1374:     my $queryString = $args->{'queryString'};
1.159     bowersj2 1375:     my $jump = $args->{'jump'};
1.158     bowersj2 1376:     my $here = $args->{'here'};
1.153     bowersj2 1377:     my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.256     albertel 1378:     my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1.140     bowersj2 1379:     my $currentJumpDelta = 2; # change this to change how many resources are displayed
                   1380:                              # before the current resource when using #current
                   1381: 
                   1382:     # If we were passed 'here' information, we are not rendering
                   1383:     # after a folder manipulation, and we were not passed an
                   1384:     # iterator, make sure we open the folders to show the "here"
                   1385:     # marker
                   1386:     my $filterHash = {};
                   1387:     # Figure out what we're not displaying
                   1388:     foreach (split(/\,/, $ENV{"form.filter"})) {
                   1389:         if ($_) {
                   1390:             $filterHash->{$_} = "1";
                   1391:         }
                   1392:     }
                   1393: 
1.191     bowersj2 1394:     # Filter: Remember filter function and add our own filter: Refuse
                   1395:     # to show hidden resources unless the user can see them.
                   1396:     my $userCanSeeHidden = advancedUser();
                   1397:     my $filterFunc = setDefault($args->{'filterFunc'},
                   1398:                                 sub {return 1;});
                   1399:     if (!$userCanSeeHidden) {
                   1400:         # Without renaming the filterfunc, the server seems to go into
                   1401:         # an infinite loop
                   1402:         my $oldFilterFunc = $filterFunc;
                   1403:         $filterFunc = sub { my $res = shift; return !$res->randomout() && 
                   1404:                                 &$oldFilterFunc($res);};
                   1405:     }
                   1406: 
1.140     bowersj2 1407:     my $condition = 0;
                   1408:     if ($ENV{'form.condition'}) {
                   1409:         $condition = 1;
                   1410:     }
                   1411: 
                   1412:     if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
                   1413:         # Step 1: Check to see if we have a navmap
                   1414:         if (!defined($navmap)) {
1.221     bowersj2 1415:             $navmap = Apache::lonnavmaps::navmap->new();
1.140     bowersj2 1416:             $mustCloseNavMap = 1;
                   1417:         }
                   1418: 
                   1419:         # Step two: Locate what kind of here marker is necessary
                   1420:         # Determine where the "here" marker is and where the screen jumps to.
                   1421: 
1.175     bowersj2 1422:         if ($ENV{'form.postsymb'}) {
1.304     albertel 1423:             $here = $jump = &Apache::lonnet::symbclean($ENV{'form.postsymb'});
1.140     bowersj2 1424:         } elsif ($ENV{'form.postdata'}) {
                   1425:             # couldn't find a symb, is there a URL?
                   1426:             my $currenturl = $ENV{'form.postdata'};
1.158     bowersj2 1427:             #$currenturl=~s/^http\:\/\///;
                   1428:             #$currenturl=~s/^[^\/]+//;
1.140     bowersj2 1429:             
1.158     bowersj2 1430:             $here = $jump = &Apache::lonnet::symbread($currenturl);
1.276     albertel 1431:         }
1.158     bowersj2 1432: 
1.140     bowersj2 1433:         # Step three: Ensure the folders are open
                   1434:         my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2 1435:         my $curRes;
1.140     bowersj2 1436:         my $found = 0;
                   1437:         
                   1438:         # We only need to do this if we need to open the maps to show the
                   1439:         # current position. This will change the counter so we can't count
                   1440:         # for the jump marker with this loop.
1.294     albertel 1441:         while ($here && ($curRes = $mapIterator->next()) && !$found) {
1.158     bowersj2 1442:             if (ref($curRes) && $curRes->symb() eq $here) {
1.140     bowersj2 1443:                 my $mapStack = $mapIterator->getStack();
                   1444:                 
                   1445:                 # Ensure the parent maps are open
                   1446:                 for my $map (@{$mapStack}) {
                   1447:                     if ($condition) {
                   1448:                         undef $filterHash->{$map->map_pc()};
                   1449:                     } else {
                   1450:                         $filterHash->{$map->map_pc()} = 1;
                   1451:                     }
                   1452:                 }
                   1453:                 $found = 1;
                   1454:             }
                   1455:         }            
1.159     bowersj2 1456:     }        
1.140     bowersj2 1457: 
                   1458:     if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
                   1459:         # If this is a click on a folder or something, we want to preserve the "here"
                   1460:         # from the querystring, and get the new "jump" marker
                   1461:         $here = $ENV{'form.here'};
                   1462:         $jump = $ENV{'form.jump'};
                   1463:     } 
                   1464:     
1.132     bowersj2 1465:     my $it = $args->{'iterator'};
                   1466:     if (!defined($it)) {
1.140     bowersj2 1467:         # Construct a default iterator based on $ENV{'form.'} information
                   1468:         
                   1469:         # Step 1: Check to see if we have a navmap
                   1470:         if (!defined($navmap)) {
1.221     bowersj2 1471:             $navmap = Apache::lonnavmaps::navmap->new();
1.140     bowersj2 1472:             $mustCloseNavMap = 1;
                   1473:         }
                   1474: 
1.144     bowersj2 1475:         # See if we're being passed a specific map
                   1476:         if ($args->{'iterator_map'}) {
                   1477:             my $map = $args->{'iterator_map'};
1.145     bowersj2 1478:             $map = $navmap->getResourceByUrl($map);
1.144     bowersj2 1479:             my $firstResource = $map->map_start();
                   1480:             my $finishResource = $map->map_finish();
                   1481: 
                   1482:             $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
                   1483:         } else {
                   1484:             $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
                   1485:         }
1.132     bowersj2 1486:     }
1.256     albertel 1487: 
1.159     bowersj2 1488:     # (re-)Locate the jump point, if any
1.191     bowersj2 1489:     # Note this does not take filtering or hidden into account... need
                   1490:     # to be fixed?
1.159     bowersj2 1491:     my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222     bowersj2 1492:     my $curRes;
1.159     bowersj2 1493:     my $foundJump = 0;
                   1494:     my $counter = 0;
                   1495:     
1.222     bowersj2 1496:     while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159     bowersj2 1497:         if (ref($curRes)) { $counter++; }
                   1498:         
                   1499:         if (ref($curRes) && $jump eq $curRes->symb()) {
                   1500:             
                   1501:             # This is why we have to use the main iterator instead of the
                   1502:             # potentially faster DFS: The count has to be the same, so
                   1503:             # the order has to be the same, which DFS won't give us.
                   1504:             $args->{'currentJumpIndex'} = $counter;
                   1505:             $foundJump = 1;
                   1506:         }
                   1507:     }
                   1508: 
1.132     bowersj2 1509:     my $showParts = setDefault($args->{'showParts'}, 1);
                   1510:     my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139     bowersj2 1511:     # keeps track of when the current resource is found,
                   1512:     # so we can back up a few and put the anchor above the
                   1513:     # current resource
1.140     bowersj2 1514:     my $printKey = $args->{'printKey'};
                   1515:     my $printCloseAll = $args->{'printCloseAll'};
                   1516:     if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.298     albertel 1517: 
1.140     bowersj2 1518:     # Print key?
                   1519:     if ($printKey) {
                   1520:         $result .= '<table border="0" cellpadding="2" cellspacing="0">';
                   1521:         my $date=localtime;
                   1522:         $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
1.298     albertel 1523: 	my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.140     bowersj2 1524:         if ($navmap->{LAST_CHECK}) {
                   1525:             $result .= 
1.298     albertel 1526:                 '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1.140     bowersj2 1527:                 strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   1528:                 '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
1.298     albertel 1529:                 '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1.140     bowersj2 1530:                 '</td>'; 
                   1531:         } else {
                   1532:             $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
1.298     albertel 1533:                 '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
                   1534:                 '&nbsp;&nbsp;<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1.140     bowersj2 1535:                 '</td>'; 
                   1536:         }
                   1537: 
                   1538:         $result .= '</tr></table>';
                   1539:     }
                   1540: 
1.172     bowersj2 1541:     if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.281     albertel 1542: 	my ($link,$text);
1.140     bowersj2 1543:         if ($condition) {
1.281     albertel 1544: 	    $link='"navmaps?condition=0&filter=&'.$queryString.
                   1545: 		'&here='.&Apache::lonnet::escape($here).'"';
                   1546: 	    $text='Close All Folders';
1.140     bowersj2 1547:         } else {
1.281     albertel 1548: 	    $link='"navmaps?condition=1&filter=&'.$queryString.
                   1549: 		'&here='.&Apache::lonnet::escape($here).'"';
                   1550: 	    $text='Open All Folders';
                   1551:         }
                   1552: 	if ($args->{'caller'} eq 'navmapsdisplay') {
                   1553: 	    &add_linkitem($args->{'linkitems'},'changefolder',
                   1554: 			  'location.href='.$link,$text);
                   1555: 	} else {
                   1556: 	    $result.='<a href='.$link.'>'.&mt($text).'</a>';
                   1557: 	}
1.266     raeburn  1558:         $result .= "\n";
                   1559:     }
1.140     bowersj2 1560: 
1.266     raeburn  1561:     # Check for any unread discussions in all resources.
1.281     albertel 1562:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.296     albertel 1563: 	&add_linkitem($args->{'linkitems'},'clearbubbles',
                   1564: 		      'document.clearbubbles.submit()',
                   1565: 		      'Mark all posts read');
1.297     albertel 1566: 	my $time=time;
1.296     albertel 1567: 	$result .= (<<END);
                   1568:     <form name="clearbubbles" method="post" action="/adm/feedback">
                   1569: 	<input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1.297     albertel 1570: 	<input type="hidden" name="navtime" value="$time" />
1.296     albertel 1571: END
                   1572:         if ($args->{'sort'} eq 'discussion') { 
                   1573: 	    my $totdisc = 0;
                   1574: 	    my $haveDisc = '';
                   1575: 	    my @allres=$navmap->retrieveResources();
                   1576: 	    foreach my $resource (@allres) {
                   1577: 		if ($resource->hasDiscussion()) {
                   1578: 		    my $ressymb;
                   1579: 		    if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
                   1580: 			$ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
                   1581: 		    } else {
                   1582: 			$ressymb = $resource->symb();
                   1583: 		    }
                   1584: 		    $haveDisc .= $ressymb.':';
                   1585: 		    $totdisc ++;
1.267     albertel 1586: 		}
                   1587: 	    }
1.296     albertel 1588: 	    if ($totdisc > 0) {
                   1589: 		$haveDisc =~ s/:$//;
                   1590: 		$result .= (<<END);
                   1591: 	<input type="hidden" name="navmaps" value="$haveDisc" />
                   1592:     </form>
                   1593: END
                   1594:             }
1.297     albertel 1595: 	}
                   1596: 	$result.='</form>';
1.266     raeburn  1597:     }
1.276     albertel 1598: 
1.281     albertel 1599:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.283     raeburn  1600:         $result .= '<table><tr><td>'.
                   1601:                    &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
                   1602: 	if ($ENV{'environment.remotenavmap'} ne 'on') {
                   1603: 	    $result .= '<td>&nbsp;</td>'; 
                   1604:         } else {
                   1605: 	    $result .= '</tr><tr>'; 
                   1606:         }
1.281     albertel 1607: 	$result.=&show_linkitems($args->{'linkitems'});
                   1608:         if ($args->{'sort_html'}) {
                   1609: 	    if ($ENV{'environment.remotenavmap'} ne 'on') {
                   1610: 		$result.='<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>'.
                   1611: 		    '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
                   1612: 	    } else {
                   1613: 		$result.='</tr><tr><td align="left"><br />'.
                   1614: 		    $args->{'sort_html'}.'</td></tr>';
                   1615: 	    }
                   1616: 	}
                   1617:         $result .= '</table>';
                   1618:     } elsif ($args->{'sort_html'}) { 
                   1619:         $result.=$args->{'sort_html'}; 
                   1620:     }
1.276     albertel 1621: 
1.266     raeburn  1622:     $result .= "<br />\n";
1.140     bowersj2 1623:     if ($r) {
                   1624:         $r->print($result);
                   1625:         $r->rflush();
                   1626:         $result = "";
                   1627:     }
1.132     bowersj2 1628:     # End parameter setting
1.133     bowersj2 1629:             
1.132     bowersj2 1630:     # Data
1.140     bowersj2 1631:     $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132     bowersj2 1632:     my $res = "Apache::lonnavmaps::resource";
                   1633:     my %condenseStatuses =
                   1634:         ( $res->NETWORK_FAILURE    => 1,
                   1635:           $res->NOTHING_SET        => 1,
                   1636:           $res->CORRECT            => 1 );
                   1637:     my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133     bowersj2 1638: 
                   1639:     # Shared variables
                   1640:     $args->{'counter'} = 0; # counts the rows
                   1641:     $args->{'indentLevel'} = 0;
                   1642:     $args->{'isNewBranch'} = 0;
                   1643:     $args->{'condensed'} = 0;    
1.298     albertel 1644:     my $location=
                   1645: 	&Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
                   1646:     $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='' border='0' />");
1.133     bowersj2 1647:     $args->{'displayedHereMarker'} = 0;
1.132     bowersj2 1648: 
1.190     bowersj2 1649:     # If we're suppressing empty sequences, look for them here. Use DFS for speed,
                   1650:     # since structure actually doesn't matter, except what map has what resources.
                   1651:     if ($args->{'suppressEmptySequences'}) {
                   1652:         my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
                   1653:                                                          $it->{FIRST_RESOURCE},
                   1654:                                                          $it->{FINISH_RESOURCE},
                   1655:                                                          {}, undef, 1);
1.222     bowersj2 1656:         my $depth = 0;
1.190     bowersj2 1657:         $dfsit->next();
                   1658:         my $curRes = $dfsit->next();
                   1659:         while ($depth > -1) {
                   1660:             if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
                   1661:             if ($curRes == $dfsit->END_MAP()) { $depth--; }
                   1662: 
                   1663:             if (ref($curRes)) { 
                   1664:                 # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201     bowersj2 1665:                 if ($curRes->is_map()) {
1.190     bowersj2 1666:                     $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
                   1667:                     # Sequences themselves do not count as visible children,
                   1668:                     # unless those sequences also have visible children.
                   1669:                     # This means if a sequence appears, there's a "promise"
                   1670:                     # that there's something under it if you open it, somewhere.
                   1671:                 } else {
                   1672:                     # Not a sequence: if it's filtered, ignore it, otherwise
                   1673:                     # rise up the stack and mark the sequences as having children
                   1674:                     if (&$filterFunc($curRes)) {
                   1675:                         for my $sequence (@{$dfsit->getStack()}) {
                   1676:                             $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
                   1677:                         }
                   1678:                     }
                   1679:                 }
                   1680:             }
                   1681:         } continue {
                   1682:             $curRes = $dfsit->next();
                   1683:         }
                   1684:     }
                   1685: 
1.133     bowersj2 1686:     my $displayedJumpMarker = 0;
1.132     bowersj2 1687:     # Set up iteration.
                   1688:     my $now = time();
                   1689:     my $in24Hours = $now + 24 * 60 * 60;
                   1690:     my $rownum = 0;
                   1691: 
1.141     bowersj2 1692:     # export "here" marker information
                   1693:     $args->{'here'} = $here;
                   1694: 
1.222     bowersj2 1695:     $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1.270     albertel 1696:     my @resources;
                   1697:     my $code='';# sub { !(shift->is_map();) };
                   1698:     if ($args->{'sort'} eq 'title') {
1.276     albertel 1699:         my $oldFilterFunc = $filterFunc;
                   1700: 	my $filterFunc= 
                   1701: 	    sub {
                   1702: 		my ($res)=@_;
                   1703: 		if ($res->is_map()) { return 0;}
                   1704: 		return &$oldFilterFunc($res);
                   1705: 	    };
                   1706: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.296     albertel 1707: 	@resources= sort { &cmp_title($a,$b) } @resources;
                   1708:     } elsif ($args->{'sort'} eq 'duedate') {
                   1709: 	my $oldFilterFunc = $filterFunc;
                   1710: 	my $filterFunc= 
                   1711: 	    sub {
                   1712: 		my ($res)=@_;
                   1713: 		if (!$res->is_problem()) { return 0;}
                   1714: 		return &$oldFilterFunc($res);
                   1715: 	    };
                   1716: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.289     raeburn  1717: 	@resources= sort {
1.270     albertel 1718: 	    if ($a->duedate ne $b->duedate) {
                   1719: 	        return $a->duedate cmp $b->duedate;
                   1720: 	    }
1.296     albertel 1721: 	    my $value=&cmp_title($a,$b);
                   1722: 	    return $value;
1.270     albertel 1723: 	} @resources;
1.296     albertel 1724:     } elsif ($args->{'sort'} eq 'discussion') {
                   1725: 	my $oldFilterFunc = $filterFunc;
                   1726: 	my $filterFunc= 
                   1727: 	    sub {
                   1728: 		my ($res)=@_;
                   1729: 		if (!$res->hasDiscussion() &&
                   1730: 		    !$res->getFeedback() &&
                   1731: 		    !$res->getErrors()) { return 0;}
                   1732: 		return &$oldFilterFunc($res);
                   1733: 	    };
                   1734: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
                   1735: 	@resources= sort { &cmp_title($a,$b) } @resources;
1.276     albertel 1736:     } else {
                   1737: 	#unknow sort mechanism or default
                   1738: 	undef($args->{'sort'});
1.270     albertel 1739:     }
                   1740: 
1.276     albertel 1741: 
1.270     albertel 1742:     while (1) {
                   1743: 	if ($args->{'sort'}) {
                   1744: 	    $curRes = shift(@resources);
                   1745: 	} else {
                   1746: 	    $curRes = $it->next($closeAllPages);
                   1747: 	}
                   1748: 	if (!$curRes) { last; }
                   1749: 
1.132     bowersj2 1750:         # Maintain indentation level.
                   1751:         if ($curRes == $it->BEGIN_MAP() ||
                   1752:             $curRes == $it->BEGIN_BRANCH() ) {
1.133     bowersj2 1753:             $args->{'indentLevel'}++;
1.132     bowersj2 1754:         }
                   1755:         if ($curRes == $it->END_MAP() ||
                   1756:             $curRes == $it->END_BRANCH() ) {
1.133     bowersj2 1757:             $args->{'indentLevel'}--;
1.132     bowersj2 1758:         }
                   1759:         # Notice new branches
                   1760:         if ($curRes == $it->BEGIN_BRANCH()) {
1.133     bowersj2 1761:             $args->{'isNewBranch'} = 1;
                   1762:         }
                   1763: 
                   1764:         # If this isn't an actual resource, continue on
                   1765:         if (!ref($curRes)) {
                   1766:             next;
1.132     bowersj2 1767:         }
1.133     bowersj2 1768: 
1.143     bowersj2 1769:         # If this has been filtered out, continue on
                   1770:         if (!(&$filterFunc($curRes))) {
                   1771:             $args->{'isNewBranch'} = 0; # Don't falsely remember this
                   1772:             next;
                   1773:         } 
1.132     bowersj2 1774: 
1.190     bowersj2 1775:         # If this is an empty sequence and we're filtering them, continue on
1.201     bowersj2 1776:         if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190     bowersj2 1777:             !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
                   1778:             next;
                   1779:         }
                   1780: 
1.153     bowersj2 1781:         # If we're suppressing navmaps and this is a navmap, continue on
                   1782:         if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
                   1783:             next;
                   1784:         }
                   1785: 
1.191     bowersj2 1786:         $args->{'counter'}++;
                   1787: 
1.132     bowersj2 1788:         # Does it have multiple parts?
1.133     bowersj2 1789:         $args->{'multipart'} = 0;
                   1790:         $args->{'condensed'} = 0;
1.132     bowersj2 1791:         my @parts;
                   1792:             
                   1793:         # Decide what parts to show.
1.133     bowersj2 1794:         if ($curRes->is_problem() && $showParts) {
1.132     bowersj2 1795:             @parts = @{$curRes->parts()};
1.192     bowersj2 1796:             $args->{'multipart'} = $curRes->multipart();
1.132     bowersj2 1797:             
                   1798:             if ($condenseParts) { # do the condensation
                   1799:                 if (!$curRes->opendate("0")) {
1.162     bowersj2 1800:                     @parts = ();
1.133     bowersj2 1801:                     $args->{'condensed'} = 1;
1.132     bowersj2 1802:                 }
1.133     bowersj2 1803:                 if (!$args->{'condensed'}) {
1.132     bowersj2 1804:                     # Decide whether to condense based on similarity
1.192     bowersj2 1805:                     my $status = $curRes->status($parts[0]);
                   1806:                     my $due = $curRes->duedate($parts[0]);
                   1807:                     my $open = $curRes->opendate($parts[0]);
1.132     bowersj2 1808:                     my $statusAllSame = 1;
                   1809:                     my $dueAllSame = 1;
                   1810:                     my $openAllSame = 1;
1.192     bowersj2 1811:                     for (my $i = 1; $i < scalar(@parts); $i++) {
1.132     bowersj2 1812:                         if ($curRes->status($parts[$i]) != $status){
                   1813:                             $statusAllSame = 0;
                   1814:                         }
                   1815:                         if ($curRes->duedate($parts[$i]) != $due ) {
                   1816:                             $dueAllSame = 0;
                   1817:                         }
                   1818:                         if ($curRes->opendate($parts[$i]) != $open) {
                   1819:                             $openAllSame = 0;
                   1820:                         }
                   1821:                     }
                   1822:                     # $*allSame is true if all the statuses were
                   1823:                     # the same. Now, if they are all the same and
                   1824:                     # match one of the statuses to condense, or they
                   1825:                     # are all open with the same due date, or they are
                   1826:                     # all OPEN_LATER with the same open date, display the
                   1827:                     # status of the first non-zero part (to get the 'correct'
                   1828:                     # status right, since 0 is never 'correct' or 'open').
                   1829:                     if (($statusAllSame && defined($condenseStatuses{$status})) ||
                   1830:                         ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                   1831:                         ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192     bowersj2 1832:                         @parts = ($parts[0]);
1.133     bowersj2 1833:                         $args->{'condensed'} = 1;
1.132     bowersj2 1834:                     }
                   1835:                 }
1.198     bowersj2 1836: 		# Multipart problem with one part: always "condense" (happens
                   1837: 		#  to match the desirable behavior)
                   1838: 		if ($curRes->countParts() == 1) {
                   1839: 		    @parts = ($parts[0]);
                   1840: 		    $args->{'condensed'} = 1;
                   1841: 		}
1.132     bowersj2 1842:             }
1.157     bowersj2 1843:         } 
1.132     bowersj2 1844:             
                   1845:         # If the multipart problem was condensed, "forget" it was multipart
                   1846:         if (scalar(@parts) == 1) {
1.133     bowersj2 1847:             $args->{'multipart'} = 0;
1.192     bowersj2 1848:         } else {
                   1849:             # Add part 0 so we display it correctly.
                   1850:             unshift @parts, '0';
1.132     bowersj2 1851:         }
1.310     albertel 1852: 	
                   1853: 	{
                   1854: 	    my ($src,$symb,$anchor,$stack);
                   1855: 	    if ($args->{'sort'}) {
                   1856: 		my $it = $navmap->getIterator(undef, undef, undef, 1);
                   1857: 		while ( my $res=$it->next()) {
                   1858: 		    if (ref($res) &&
                   1859: 			$res->symb() eq  $curRes->symb()) { last; }
                   1860: 		}
                   1861: 		$stack=$it->getStack();
                   1862: 	    } else {
                   1863: 		$stack=$it->getStack();
                   1864: 	    }
                   1865: 	    ($src,$symb,$anchor)=getLinkForResource($stack);
                   1866: 	    if (defined($anchor)) { $anchor='#'.$anchor; }
                   1867: 	    my $srcHasQuestion = $src =~ /\?/;
                   1868: 	    $args->{"resourceLink"} = $src.
                   1869: 		($srcHasQuestion?'&':'?') .
                   1870: 		'symb=' . &Apache::lonnet::escape($symb).$anchor;
                   1871: 	}
1.132     bowersj2 1872:         # Now, we've decided what parts to show. Loop through them and
                   1873:         # show them.
1.192     bowersj2 1874:         foreach my $part (@parts) {
1.132     bowersj2 1875:             $rownum ++;
                   1876:             my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
                   1877:             
                   1878:             $result .= "  <tr bgcolor='$backgroundColor'>\n";
1.134     bowersj2 1879: 
                   1880:             # Set up some data about the parts that the cols might want
                   1881:             my $filter = $it->{FILTER};
1.270     albertel 1882: 
1.132     bowersj2 1883:             # Now, display each column.
                   1884:             foreach my $col (@$cols) {
1.139     bowersj2 1885:                 my $colHTML = '';
                   1886:                 if (ref($col)) {
                   1887:                     $colHTML .= &$col($curRes, $part, $args);
                   1888:                 } else {
                   1889:                     $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
                   1890:                 }
1.132     bowersj2 1891: 
1.133     bowersj2 1892:                 # If this is the first column and it's time to print
                   1893:                 # the anchor, do so
                   1894:                 if ($col == $cols->[0] && 
                   1895:                     $args->{'counter'} == $args->{'currentJumpIndex'} - 
1.139     bowersj2 1896:                     $currentJumpDelta) {
                   1897:                     # Jam the anchor after the <td> tag;
                   1898:                     # necessary for valid HTML (which Mozilla requires)
                   1899:                     $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133     bowersj2 1900:                     $displayedJumpMarker = 1;
                   1901:                 }
1.139     bowersj2 1902:                 $result .= $colHTML . "\n";
1.132     bowersj2 1903:             }
1.139     bowersj2 1904:             $result .= "    </tr>\n";
1.140     bowersj2 1905:             $args->{'isNewBranch'} = 0;
1.139     bowersj2 1906:         }
1.153     bowersj2 1907: 
1.139     bowersj2 1908:         if ($r && $rownum % 20 == 0) {
                   1909:             $r->print($result);
                   1910:             $result = "";
                   1911:             $r->rflush();
1.132     bowersj2 1912:         }
1.156     bowersj2 1913:     } continue {
1.208     bowersj2 1914: 	if ($r) {
                   1915: 	    # If we have the connection, make sure the user is still connected
                   1916: 	    my $c = $r->connection;
                   1917: 	    if ($c->aborted()) {
                   1918: 		# Who cares what we do, nobody will see it anyhow.
                   1919: 		return '';
                   1920: 	    }
                   1921: 	}
1.132     bowersj2 1922:     }
                   1923:     
1.134     bowersj2 1924:     # Print out the part that jumps to #curloc if it exists
1.159     bowersj2 1925:     # delay needed because the browser is processing the jump before
                   1926:     # it finishes rendering, so it goes to the wrong place!
                   1927:     # onload might be better, but this routine has no access to that.
                   1928:     # On mozilla, the 0-millisecond timeout seems to prevent this;
                   1929:     # it's quite likely this might fix other browsers, too, and 
                   1930:     # certainly won't hurt anything.
1.139     bowersj2 1931:     if ($displayedJumpMarker) {
1.247     albertel 1932:         $result .= "
                   1933: <script>
                   1934: if (location.href.indexOf('#curloc')==-1) {
                   1935:     setTimeout(\"location += '#curloc';\", 0)
                   1936: }
                   1937: </script>";
1.134     bowersj2 1938:     }
                   1939: 
1.132     bowersj2 1940:     $result .= "</table>";
1.140     bowersj2 1941:     
                   1942:     if ($r) {
                   1943:         $r->print($result);
                   1944:         $result = "";
                   1945:         $r->rflush();
                   1946:     }
                   1947:         
1.132     bowersj2 1948:     return $result;
                   1949: }
                   1950: 
1.281     albertel 1951: sub add_linkitem {
                   1952:     my ($linkitems,$name,$cmd,$text)=@_;
                   1953:     $$linkitems{$name}{'cmd'}=$cmd;
                   1954:     $$linkitems{$name}{'text'}=&mt($text);
                   1955: }
                   1956: 
                   1957: sub show_linkitems {
                   1958:     my ($linkitems)=@_;
                   1959:     my @linkorder = ("launchnav","closenav","firsthomework","everything",
                   1960: 		     "uncompleted","changefolder","clearbubbles");
                   1961:     
                   1962:     my $result .= (<<ENDBLOCK);
1.283     raeburn  1963:               <td align="left">
1.281     albertel 1964: <script type="text/javascript">
                   1965:     function changeNavDisplay () {
                   1966: 	var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
                   1967: ENDBLOCK
                   1968:     foreach my $link (@linkorder) {
                   1969: 	$result.= "if (navchoice == '$link') {".
                   1970: 	    $linkitems->{$link}{'cmd'}."}\n";
                   1971:     }
                   1972:     $result.='}
                   1973:               </script>
                   1974:                    <form name="linkitems" method="post">
                   1975:                        <nobr><select name="toplink">'."\n";
                   1976:     foreach my $link (@linkorder) {
                   1977: 	if (defined($linkitems->{$link})) {
                   1978: 	    if ($linkitems->{$link}{'text'} ne '') {
                   1979: 		$result .= ' <option value="'.$link.'">'.
                   1980: 		    $linkitems->{$link}{'text'}."</option>\n";
                   1981: 	    }
                   1982: 	}
                   1983:     }
                   1984:     $result .= '</select>&nbsp;<input type="button" name="chgnav"
                   1985:                    value="Go" onClick="javascript:changeNavDisplay()" />
                   1986:                 </nobr></form></td>'."\n";
1.298     albertel 1987: 	
1.281     albertel 1988:     return $result;
                   1989: }
                   1990: 
1.133     bowersj2 1991: 1;
                   1992: 
                   1993: package Apache::lonnavmaps::navmap;
                   1994: 
                   1995: =pod
                   1996: 
1.216     bowersj2 1997: =head1 Object: Apache::lonnavmaps::navmap
1.133     bowersj2 1998: 
1.217     bowersj2 1999: =head2 Overview
1.133     bowersj2 2000: 
1.217     bowersj2 2001: The navmap object's job is to provide access to the resources
                   2002: in the course as Apache::lonnavmaps::resource objects, and to
                   2003: query and manage the relationship between those resource objects.
                   2004: 
                   2005: Generally, you'll use the navmap object in one of three basic ways.
                   2006: In order of increasing complexity and power:
                   2007: 
                   2008: =over 4
                   2009: 
                   2010: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
                   2011:     various ways to obtain resource objects, based on various identifiers.
                   2012:     Use this when you want to request information about one object or 
                   2013:     a handful of resources you already know the identities of, from some
                   2014:     other source. For more about Ids, Symbs, and MapPcs, see the
                   2015:     Resource documentation. Note that Url should be a B<last resort>,
                   2016:     not your first choice; it only works when there is only one
                   2017:     instance of the resource in the course, which only applies to
                   2018:     maps, and even that may change in the future.
                   2019: 
                   2020: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
                   2021:     retrieves resources matching some criterion and returns them
                   2022:     in a flat array, with no structure information. Use this when
                   2023:     you are manipulating a series of resources, based on what map
                   2024:     the are in, but do not care about branching, or exactly how
                   2025:     the maps and resources are related. This is the most common case.
                   2026: 
                   2027: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
                   2028:     the course's navmap in various ways without writing the traversal
                   2029:     code yourself. See iterator documentation below. Use this when
                   2030:     you need to know absolutely everything about the course, including
                   2031:     branches and the precise relationship between maps and resources.
                   2032: 
                   2033: =back
                   2034: 
                   2035: =head2 Creation And Destruction
                   2036: 
                   2037: To create a navmap object, use the following function:
1.133     bowersj2 2038: 
                   2039: =over 4
                   2040: 
1.221     bowersj2 2041: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133     bowersj2 2042: 
1.221     bowersj2 2043: Creates a new navmap object. Returns the navmap object if this is
                   2044: successful, or B<undef> if not.
1.174     albertel 2045: 
1.216     bowersj2 2046: =back
                   2047: 
                   2048: =head2 Methods
                   2049: 
                   2050: =over 4
                   2051: 
1.174     albertel 2052: =item * B<getIterator>(first, finish, filter, condition):
                   2053: 
                   2054: See iterator documentation below.
1.133     bowersj2 2055: 
                   2056: =cut
                   2057: 
                   2058: use strict;
                   2059: use GDBM_File;
                   2060: 
                   2061: sub new {
                   2062:     # magic invocation to create a class instance
                   2063:     my $proto = shift;
                   2064:     my $class = ref($proto) || $proto;
                   2065:     my $self = {};
                   2066: 
                   2067:     # Resource cache stores navmap resources as we reference them. We generate
                   2068:     # them on-demand so we don't pay for creating resources unless we use them.
                   2069:     $self->{RESOURCE_CACHE} = {};
                   2070: 
                   2071:     # Network failure flag, if we accessed the course or user opt and
                   2072:     # failed
                   2073:     $self->{NETWORK_FAILURE} = 0;
                   2074: 
                   2075:     # tie the nav hash
                   2076: 
1.168     bowersj2 2077:     my %navmaphash;
                   2078:     my %parmhash;
1.220     bowersj2 2079:     my $courseFn = $ENV{"request.course.fn"};
                   2080:     if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133     bowersj2 2081:               &GDBM_READER(), 0640))) {
                   2082:         return undef;
                   2083:     }
                   2084:     
1.220     bowersj2 2085:     if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133     bowersj2 2086:               &GDBM_READER(), 0640)))
                   2087:     {
1.170     matthew  2088:         untie %{$self->{PARM_HASH}};
1.133     bowersj2 2089:         return undef;
                   2090:     }
                   2091: 
1.199     bowersj2 2092:     $self->{NAV_HASH} = \%navmaphash;
1.168     bowersj2 2093:     $self->{PARM_HASH} = \%parmhash;
1.221     bowersj2 2094:     $self->{PARM_CACHE} = {};
1.133     bowersj2 2095: 
                   2096:     bless($self);
                   2097:         
                   2098:     return $self;
                   2099: }
                   2100: 
1.221     bowersj2 2101: sub generate_course_user_opt {
1.133     bowersj2 2102:     my $self = shift;
1.221     bowersj2 2103:     if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133     bowersj2 2104: 
1.221     bowersj2 2105:     my $uname=$ENV{'user.name'};
                   2106:     my $udom=$ENV{'user.domain'};
                   2107:     my $uhome=$ENV{'user.home'};
                   2108:     my $cid=$ENV{'request.course.id'};
                   2109:     my $chome=$ENV{'course.'.$cid.'.home'};
                   2110:     my ($cdom,$cnum)=split(/\_/,$cid);
                   2111:     
                   2112:     my $userprefix=$uname.'_'.$udom.'_';
                   2113:     
                   2114:     my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
                   2115:     unless ($uhome eq 'no_host') { 
1.133     bowersj2 2116: # ------------------------------------------------- Get coursedata (if present)
1.221     bowersj2 2117: 	unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                   2118: 	    my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                   2119: 					     ':resourcedata',$chome);
                   2120: 	    # Check for network failure
                   2121: 	    if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
                   2122: 		$self->{NETWORK_FAILURE} = 1;
                   2123: 	    } elsif ($reply!~/^error\:/) {
                   2124: 		$courserdatas{$cid}=$reply;
                   2125: 		$courserdatas{$cid.'.last_cache'}=time;
                   2126: 	    }
                   2127: 	}
                   2128: 	foreach (split(/\&/,$courserdatas{$cid})) {
                   2129: 	    my ($name,$value)=split(/\=/,$_);
                   2130: 	    $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
                   2131: 		&Apache::lonnet::unescape($value);
                   2132: 	}
1.133     bowersj2 2133: # --------------------------------------------------- Get userdata (if present)
1.221     bowersj2 2134: 	unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
                   2135: 	    my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
                   2136: 	    if ($reply!~/^error\:/) {
                   2137: 		$userrdatas{$uname.'___'.$udom}=$reply;
                   2138: 		$userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
                   2139: 	    }
                   2140: 	    # check to see if network failed
                   2141: 	    elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                   2142: 	    {
                   2143: 		$self->{NETWORK_FAILURE} = 1;
                   2144: 	    }
                   2145: 	}
                   2146: 	foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
                   2147: 	    my ($name,$value)=split(/\=/,$_);
                   2148: 	    $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
                   2149: 		&Apache::lonnet::unescape($value);
                   2150: 	}
                   2151: 	$self->{COURSE_OPT} = \%courseopt;
                   2152: 	$self->{USER_OPT} = \%useropt;
                   2153:     }
                   2154: 
                   2155:     $self->{COURSE_USER_OPT_GENERATED} = 1;
                   2156:     
                   2157:     return;
                   2158: }
                   2159: 
                   2160: sub generate_email_discuss_status {
                   2161:     my $self = shift;
1.259     raeburn  2162:     my $symb = shift;
1.221     bowersj2 2163:     if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133     bowersj2 2164: 
1.221     bowersj2 2165:     my $cid=$ENV{'request.course.id'};
                   2166:     my ($cdom,$cnum)=split(/\_/,$cid);
                   2167:     
                   2168:     my %emailstatus = &Apache::lonnet::dump('email_status');
                   2169:     my $logoutTime = $emailstatus{'logout'};
                   2170:     my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
                   2171:     $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
                   2172: 			   $courseLeaveTime : $logoutTime);
                   2173:     my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                   2174: 					       $cdom, $cnum);
1.259     raeburn  2175:     my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
                   2176:                                         $ENV{'user.domain'},$ENV{'user.name'},'lastread');
                   2177:     my %lastreadtime = ();
                   2178:     foreach (keys %lastread) {
                   2179:         my $key = $_;
                   2180:         $key =~ s/_lastread$//;
                   2181:         $lastreadtime{$key} = $lastread{$_};
                   2182:     }
                   2183: 
1.221     bowersj2 2184:     my %feedback=();
                   2185:     my %error=();
                   2186:     my $keys = &Apache::lonnet::reply('keys:'.
                   2187: 				      $ENV{'user.domain'}.':'.
                   2188: 				      $ENV{'user.name'}.':nohist_email',
                   2189: 				      $ENV{'user.home'});
                   2190:     
                   2191:     foreach my $msgid (split(/\&/, $keys)) {
                   2192: 	$msgid=&Apache::lonnet::unescape($msgid);
1.295     albertel 2193: 	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
                   2194: 	    my $plain=
                   2195: 		&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
                   2196: 	    if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
                   2197: 		my ($what,$url)=($1,$2);
1.221     bowersj2 2198: 		if ($what eq 'Error') {
                   2199: 		    $error{$url}.=','.$msgid; 
                   2200: 		} else {
                   2201: 		    $feedback{$url}.=','.$msgid;
                   2202: 		}
                   2203: 	    }
                   2204: 	}
1.211     bowersj2 2205:     }
1.221     bowersj2 2206:     
1.295     albertel 2207:     #url's of resources that have feedbacks
1.221     bowersj2 2208:     $self->{FEEDBACK} = \%feedback;
1.295     albertel 2209:     #or errors
                   2210:     $self->{ERROR_MSG} = \%error;
1.221     bowersj2 2211:     $self->{DISCUSSION_TIME} = \%discussiontime;
                   2212:     $self->{EMAIL_STATUS} = \%emailstatus;
1.259     raeburn  2213:     $self->{LAST_READ} = \%lastreadtime;
1.221     bowersj2 2214:     
                   2215:     $self->{EMAIL_DISCUSS_GENERATED} = 1;
                   2216: }
                   2217: 
                   2218: sub get_user_data {
                   2219:     my $self = shift;
                   2220:     if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211     bowersj2 2221: 
1.221     bowersj2 2222:     # Retrieve performance data on problems
                   2223:     my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
                   2224: 						   $ENV{'user.domain'},
                   2225: 						   $ENV{'user.name'});
                   2226:     $self->{STUDENT_DATA} = \%student_data;
1.133     bowersj2 2227: 
1.221     bowersj2 2228:     $self->{RETRIEVED_USER_DATA} = 1;
1.133     bowersj2 2229: }
                   2230: 
                   2231: # Internal function: Takes a key to look up in the nav hash and implements internal
                   2232: # memory caching of that key.
                   2233: sub navhash {
                   2234:     my $self = shift; my $key = shift;
                   2235:     return $self->{NAV_HASH}->{$key};
                   2236: }
                   2237: 
1.217     bowersj2 2238: =pod
                   2239: 
                   2240: =item * B<courseMapDefined>(): Returns true if the course map is defined, 
                   2241:     false otherwise. Undefined course maps indicate an error somewhere in
                   2242:     LON-CAPA, and you will not be able to proceed with using the navmap.
                   2243:     See the B<NAV> screen for an example of using this.
                   2244: 
                   2245: =cut
                   2246: 
1.133     bowersj2 2247: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   2248: sub courseMapDefined {
                   2249:     my $self = shift;
                   2250:     my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
                   2251: 
                   2252:     my $firstres = $self->navhash("map_start_$uri");
                   2253:     my $lastres = $self->navhash("map_finish_$uri");
                   2254:     return $firstres && $lastres;
                   2255: }
                   2256: 
                   2257: sub getIterator {
                   2258:     my $self = shift;
                   2259:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
                   2260:                                                      shift, undef, shift);
                   2261:     return $iterator;
                   2262: }
                   2263: 
                   2264: # Private method: Does the given resource (as a symb string) have
                   2265: # current discussion? Returns 0 if chat/mail data not extracted.
                   2266: sub hasDiscussion {
                   2267:     my $self = shift;
                   2268:     my $symb = shift;
1.221     bowersj2 2269:     
                   2270:     $self->generate_email_discuss_status();
                   2271: 
1.133     bowersj2 2272:     if (!defined($self->{DISCUSSION_TIME})) { return 0; }
                   2273: 
                   2274:     #return defined($self->{DISCUSSION_TIME}->{$symb});
1.259     raeburn  2275: 
                   2276: # backward compatibility (bulletin boards used to be 'wrapped')
                   2277:     my $ressymb = $symb;
                   2278:     if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
1.266     raeburn  2279:         unless ($ressymb =~ m|adm/wrapper/adm|) {
1.259     raeburn  2280:             $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
                   2281:         }
                   2282:     }
                   2283: 
                   2284:     if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
                   2285:         return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
                   2286:     } else {
1.266     raeburn  2287: #        return $self->{DISCUSSION_TIME}->{$ressymb} >  $self->{LAST_CHECK}; # v.1.1 behavior 
                   2288:         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  2289:     }
1.133     bowersj2 2290: }
                   2291: 
                   2292: # Private method: Does the given resource (as a symb string) have
                   2293: # current feedback? Returns the string in the feedback hash, which
                   2294: # will be false if it does not exist.
                   2295: sub getFeedback { 
                   2296:     my $self = shift;
                   2297:     my $symb = shift;
                   2298: 
1.221     bowersj2 2299:     $self->generate_email_discuss_status();
                   2300: 
1.133     bowersj2 2301:     if (!defined($self->{FEEDBACK})) { return ""; }
                   2302:     
                   2303:     return $self->{FEEDBACK}->{$symb};
                   2304: }
                   2305: 
                   2306: # Private method: Get the errors for that resource (by source).
                   2307: sub getErrors { 
                   2308:     my $self = shift;
                   2309:     my $src = shift;
1.221     bowersj2 2310: 
                   2311:     $self->generate_email_discuss_status();
                   2312: 
1.133     bowersj2 2313:     if (!defined($self->{ERROR_MSG})) { return ""; }
                   2314:     return $self->{ERROR_MSG}->{$src};
                   2315: }
                   2316: 
                   2317: =pod
                   2318: 
1.174     albertel 2319: =item * B<getById>(id):
                   2320: 
                   2321: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
                   2322: object for that resource. This method, or other methods that use it
                   2323: (as in the resource object) is the only proper way to obtain a
                   2324: resource object.
1.133     bowersj2 2325: 
1.194     bowersj2 2326: =item * B<getBySymb>(symb):
                   2327: 
                   2328: Based on the symb of the resource, get a resource object for that
                   2329: resource. This is one of the proper ways to get a resource object.
                   2330: 
                   2331: =item * B<getMapByMapPc>(map_pc):
                   2332: 
                   2333: Based on the map_pc of the resource, get a resource object for
                   2334: the given map. This is one of the proper ways to get a resource object.
                   2335: 
1.133     bowersj2 2336: =cut
                   2337: 
                   2338: # The strategy here is to cache the resource objects, and only construct them
                   2339: # as we use them. The real point is to prevent reading any more from the tied
                   2340: # hash then we have to, which should hopefully alleviate speed problems.
                   2341: 
                   2342: sub getById {
                   2343:     my $self = shift;
                   2344:     my $id = shift;
                   2345: 
                   2346:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   2347:     {
                   2348:         return $self->{RESOURCE_CACHE}->{$id};
                   2349:     }
                   2350: 
                   2351:     # resource handles inserting itself into cache.
                   2352:     # Not clear why the quotes are necessary, but as of this
                   2353:     # writing it doesn't work without them.
                   2354:     return "Apache::lonnavmaps::resource"->new($self, $id);
1.132     bowersj2 2355: }
1.133     bowersj2 2356: 
1.172     bowersj2 2357: sub getBySymb {
                   2358:     my $self = shift;
                   2359:     my $symb = shift;
1.277     matthew  2360: 
1.228     albertel 2361:     my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172     bowersj2 2362:     my $map = $self->getResourceByUrl($mapUrl);
1.277     matthew  2363:     my $returnvalue = undef;
                   2364:     if (ref($map)) {
                   2365:         $returnvalue = $self->getById($map->map_pc() .'.'.$id);
                   2366:     }
                   2367:     return $returnvalue;
1.194     bowersj2 2368: }
                   2369: 
                   2370: sub getByMapPc {
                   2371:     my $self = shift;
                   2372:     my $map_pc = shift;
                   2373:     my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
                   2374:     $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
                   2375:     return $self->getById($map_id);
1.172     bowersj2 2376: }
                   2377: 
1.133     bowersj2 2378: =pod
                   2379: 
1.174     albertel 2380: =item * B<firstResource>():
                   2381: 
                   2382: Returns a resource object reference corresponding to the first
                   2383: resource in the navmap.
1.133     bowersj2 2384: 
                   2385: =cut
                   2386: 
                   2387: sub firstResource {
                   2388:     my $self = shift;
                   2389:     my $firstResource = $self->navhash('map_start_' .
                   2390:                      &Apache::lonnet::clutter($ENV{'request.course.uri'}));
                   2391:     return $self->getById($firstResource);
1.132     bowersj2 2392: }
1.133     bowersj2 2393: 
                   2394: =pod
                   2395: 
1.174     albertel 2396: =item * B<finishResource>():
                   2397: 
                   2398: Returns a resource object reference corresponding to the last resource
                   2399: in the navmap.
1.133     bowersj2 2400: 
                   2401: =cut
                   2402: 
                   2403: sub finishResource {
                   2404:     my $self = shift;
                   2405:     my $firstResource = $self->navhash('map_finish_' .
                   2406:                      &Apache::lonnet::clutter($ENV{'request.course.uri'}));
                   2407:     return $self->getById($firstResource);
1.132     bowersj2 2408: }
1.133     bowersj2 2409: 
                   2410: # Parmval reads the parm hash and cascades the lookups. parmval_real does
                   2411: # the actual lookup; parmval caches the results.
                   2412: sub parmval {
                   2413:     my $self = shift;
                   2414:     my ($what,$symb)=@_;
                   2415:     my $hashkey = $what."|||".$symb;
                   2416: 
                   2417:     if (defined($self->{PARM_CACHE}->{$hashkey})) {
                   2418:         return $self->{PARM_CACHE}->{$hashkey};
                   2419:     }
                   2420: 
                   2421:     my $result = $self->parmval_real($what, $symb);
                   2422:     $self->{PARM_CACHE}->{$hashkey} = $result;
                   2423:     return $result;
1.132     bowersj2 2424: }
                   2425: 
1.133     bowersj2 2426: sub parmval_real {
                   2427:     my $self = shift;
1.219     albertel 2428:     my ($what,$symb,$recurse) = @_;
1.133     bowersj2 2429: 
1.221     bowersj2 2430:     # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
                   2431:     $self->generate_course_user_opt();
                   2432: 
1.133     bowersj2 2433:     my $cid=$ENV{'request.course.id'};
                   2434:     my $csec=$ENV{'request.course.sec'};
                   2435:     my $uname=$ENV{'user.name'};
                   2436:     my $udom=$ENV{'user.domain'};
                   2437: 
                   2438:     unless ($symb) { return ''; }
                   2439:     my $result='';
                   2440: 
1.226     www      2441:     my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.133     bowersj2 2442: 
                   2443: # ----------------------------------------------------- Cascading lookup scheme
                   2444:     my $rwhat=$what;
                   2445:     $what=~s/^parameter\_//;
                   2446:     $what=~s/\_/\./;
                   2447: 
                   2448:     my $symbparm=$symb.'.'.$what;
                   2449:     my $mapparm=$mapname.'___(all).'.$what;
                   2450:     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
                   2451: 
                   2452:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   2453:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   2454:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   2455: 
                   2456:     my $courselevel= $usercourseprefix.'.'.$what;
                   2457:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   2458:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   2459: 
                   2460:     my $useropt = $self->{USER_OPT};
                   2461:     my $courseopt = $self->{COURSE_OPT};
                   2462:     my $parmhash = $self->{PARM_HASH};
                   2463: 
                   2464: # ---------------------------------------------------------- first, check user
                   2465:     if ($uname and defined($useropt)) {
                   2466:         if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
                   2467:         if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
                   2468:         if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
                   2469:     }
                   2470: 
                   2471: # ------------------------------------------------------- second, check course
                   2472:     if ($csec and defined($courseopt)) {
                   2473:         if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
                   2474:         if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
                   2475:         if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
                   2476:     }
                   2477: 
                   2478:     if (defined($courseopt)) {
                   2479:         if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
                   2480:         if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
                   2481:         if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
                   2482:     }
                   2483: 
                   2484: # ----------------------------------------------------- third, check map parms
                   2485: 
                   2486:     my $thisparm=$$parmhash{$symbparm};
                   2487:     if (defined($thisparm)) { return $thisparm; }
                   2488: 
                   2489: # ----------------------------------------------------- fourth , check default
                   2490: 
1.246     albertel 2491:     my $meta_rwhat=$rwhat;
                   2492:     $meta_rwhat=~s/\./_/g;
                   2493:     my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
                   2494:     if (defined($default)) { return $default}
                   2495:     $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.133     bowersj2 2496:     if (defined($default)) { return $default}
                   2497: 
                   2498: # --------------------------------------------------- fifth , cascade up parts
                   2499: 
                   2500:     my ($space,@qualifier)=split(/\./,$rwhat);
                   2501:     my $qualifier=join('.',@qualifier);
                   2502:     unless ($space eq '0') {
1.160     albertel 2503: 	my @parts=split(/_/,$space);
                   2504: 	my $id=pop(@parts);
                   2505: 	my $part=join('_',@parts);
                   2506: 	if ($part eq '') { $part='0'; }
1.219     albertel 2507: 	my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
1.160     albertel 2508: 	if (defined($partgeneral)) { return $partgeneral; }
1.133     bowersj2 2509:     }
1.219     albertel 2510:     if ($recurse) { return undef; }
                   2511:     my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
                   2512:     if (defined($pack_def)) { return $pack_def; }
1.133     bowersj2 2513:     return '';
1.145     bowersj2 2514: }
                   2515: 
1.174     albertel 2516: =pod
1.145     bowersj2 2517: 
1.174     albertel 2518: =item * B<getResourceByUrl>(url):
1.145     bowersj2 2519: 
1.174     albertel 2520: Retrieves a resource object by URL of the resource. If passed a
                   2521: resource object, it will simply return it, so it is safe to use this
                   2522: method in code like "$res = $navmap->getResourceByUrl($res)", if
                   2523: you're not sure if $res is already an object, or just a URL. If the
                   2524: resource appears multiple times in the course, only the first instance
                   2525: will be returned. As a result, this is probably useful only for maps.
                   2526: 
                   2527: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
                   2528: 
                   2529: The map is a specification of a map to retreive the resources from,
                   2530: either as a url or as an object. The filterFunc is a reference to a
                   2531: function that takes a resource object as its one argument and returns
                   2532: true if the resource should be included, or false if it should not
                   2533: be. If recursive is true, the map will be recursively examined,
                   2534: otherwise it will not be. If bailout is true, the function will return
                   2535: as soon as it finds a resource, if false it will finish. By default,
                   2536: the map is the top-level map of the course, filterFunc is a function
                   2537: that always returns 1, recursive is true, bailout is false. The
                   2538: resources will be returned in a list containing the resource objects
                   2539: for the corresponding resources, with B<no structure information> in
                   2540: the list; regardless of branching, recursion, etc., it will be a flat
                   2541: list.
                   2542: 
                   2543: Thus, this is suitable for cases where you don't want the structure,
                   2544: just a list of all resources. It is also suitable for finding out how
                   2545: many resources match a given description; for this use, if all you
                   2546: want to know is if I<any> resources match the description, the bailout
                   2547: parameter will allow you to avoid potentially expensive enumeration of
                   2548: all matching resources.
1.145     bowersj2 2549: 
1.256     albertel 2550: =item * B<hasResource>(map, filterFunc, recursive):
1.145     bowersj2 2551: 
1.174     albertel 2552: Convience method for
1.146     bowersj2 2553: 
                   2554:  scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
                   2555: 
1.174     albertel 2556: which will tell whether the map has resources matching the description
                   2557: in the filter function.
1.146     bowersj2 2558: 
1.145     bowersj2 2559: =cut
                   2560: 
1.277     matthew  2561: 
1.145     bowersj2 2562: sub getResourceByUrl {
                   2563:     my $self = shift;
                   2564:     my $resUrl = shift;
                   2565: 
                   2566:     if (ref($resUrl)) { return $resUrl; }
                   2567: 
                   2568:     $resUrl = &Apache::lonnet::clutter($resUrl);
                   2569:     my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
                   2570:     if ($resId =~ /,/) {
                   2571:         $resId = (split (/,/, $resId))[0];
                   2572:     }
                   2573:     if (!$resId) { return ''; }
                   2574:     return $self->getById($resId);
                   2575: }
                   2576: 
                   2577: sub retrieveResources {
                   2578:     my $self = shift;
                   2579:     my $map = shift;
                   2580:     my $filterFunc = shift;
                   2581:     if (!defined ($filterFunc)) {
                   2582:         $filterFunc = sub {return 1;};
                   2583:     }
                   2584:     my $recursive = shift;
                   2585:     if (!defined($recursive)) { $recursive = 1; }
                   2586:     my $bailout = shift;
                   2587:     if (!defined($bailout)) { $bailout = 0; }
                   2588: 
                   2589:     # Create the necessary iterator.
                   2590:     if (!ref($map)) { # assume it's a url of a map.
1.172     bowersj2 2591:         $map = $self->getResourceByUrl($map);
1.145     bowersj2 2592:     }
                   2593: 
1.213     bowersj2 2594:     # If nothing was passed, assume top-level map
                   2595:     if (!$map) {
                   2596: 	$map = $self->getById('0.0');
                   2597:     }
                   2598: 
1.145     bowersj2 2599:     # Check the map's validity.
1.213     bowersj2 2600:     if (!$map->is_map()) {
1.145     bowersj2 2601:         # Oh, to throw an exception.... how I'd love that!
                   2602:         return ();
                   2603:     }
                   2604: 
1.146     bowersj2 2605:     # Get an iterator.
                   2606:     my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.215     bowersj2 2607:                                 undef, $recursive);
1.146     bowersj2 2608: 
                   2609:     my @resources = ();
                   2610: 
                   2611:     # Run down the iterator and collect the resources.
1.222     bowersj2 2612:     my $curRes;
                   2613: 
                   2614:     while ($curRes = $it->next()) {
1.146     bowersj2 2615:         if (ref($curRes)) {
                   2616:             if (!&$filterFunc($curRes)) {
                   2617:                 next;
                   2618:             }
                   2619: 
                   2620:             push @resources, $curRes;
                   2621: 
                   2622:             if ($bailout) {
                   2623:                 return @resources;
                   2624:             }
                   2625:         }
                   2626: 
                   2627:     }
                   2628: 
                   2629:     return @resources;
                   2630: }
                   2631: 
                   2632: sub hasResource {
                   2633:     my $self = shift;
                   2634:     my $map = shift;
                   2635:     my $filterFunc = shift;
                   2636:     my $recursive = shift;
                   2637:     
                   2638:     return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133     bowersj2 2639: }
1.51      bowersj2 2640: 
                   2641: 1;
                   2642: 
                   2643: package Apache::lonnavmaps::iterator;
1.300     albertel 2644: use WeakRef;
1.51      bowersj2 2645: =pod
                   2646: 
                   2647: =back
                   2648: 
1.174     albertel 2649: =head1 Object: navmap Iterator
1.51      bowersj2 2650: 
1.174     albertel 2651: An I<iterator> encapsulates the logic required to traverse a data
                   2652: structure. navmap uses an iterator to traverse the course map
                   2653: according to the criteria you wish to use.
                   2654: 
                   2655: To obtain an iterator, call the B<getIterator>() function of a
                   2656: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
                   2657: directly.) This will return a reference to the iterator:
1.51      bowersj2 2658: 
                   2659: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   2660: 
                   2661: To get the next thing from the iterator, call B<next>:
                   2662: 
                   2663: C<my $nextThing = $resourceIterator-E<gt>next()>
                   2664: 
                   2665: getIterator behaves as follows:
                   2666: 
                   2667: =over 4
                   2668: 
1.174     albertel 2669: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
                   2670: 
                   2671: All parameters are optional. firstResource is a resource reference
                   2672: corresponding to where the iterator should start. It defaults to
                   2673: navmap->firstResource() for the corresponding nav map. finishResource
                   2674: corresponds to where you want the iterator to end, defaulting to
                   2675: navmap->finishResource(). filterHash is a hash used as a set
                   2676: containing strings representing the resource IDs, defaulting to
                   2677: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205     bowersj2 2678: hash: If a 0, then only resources that exist IN the filterHash will be
1.174     albertel 2679: recursed on. If it is a 1, only resources NOT in the filterHash will
                   2680: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
                   2681: false (default), the iterator will only return the first level of map
                   2682: that is not just a single, 'redirecting' map. If true, the iterator
                   2683: will return all information, starting with the top-level map,
                   2684: regardless of content. returnTopMap, if true (default false), will
                   2685: cause the iterator to return the top-level map object (resource 0.0)
                   2686: before anything else.
                   2687: 
                   2688: Thus, by default, only top-level resources will be shown. Change the
                   2689: condition to a 1 without changing the hash, and all resources will be
                   2690: shown. Changing the condition to 1 and including some values in the
                   2691: hash will allow you to selectively suppress parts of the navmap, while
                   2692: leaving it on 0 and adding things to the hash will allow you to
                   2693: selectively add parts of the nav map. See the handler code for
                   2694: examples.
                   2695: 
                   2696: The iterator will return either a reference to a resource object, or a
                   2697: token representing something in the map, such as the beginning of a
                   2698: new branch. The possible tokens are:
                   2699: 
                   2700: =over 4
1.51      bowersj2 2701: 
1.222     bowersj2 2702: =item * B<END_ITERATOR>:
                   2703: 
                   2704: The iterator has returned all that it's going to. Further calls to the
                   2705: iterator will just produce more of these. This is a "false" value, and
                   2706: is the only false value the iterator which will be returned, so it can
                   2707: be used as a loop sentinel.
                   2708: 
1.217     bowersj2 2709: =item * B<BEGIN_MAP>:
1.51      bowersj2 2710: 
1.174     albertel 2711: A new map is being recursed into. This is returned I<after> the map
                   2712: resource itself is returned.
1.51      bowersj2 2713: 
1.217     bowersj2 2714: =item * B<END_MAP>:
1.174     albertel 2715: 
                   2716: The map is now done.
1.51      bowersj2 2717: 
1.217     bowersj2 2718: =item * B<BEGIN_BRANCH>:
1.70      bowersj2 2719: 
1.174     albertel 2720: A branch is now starting. The next resource returned will be the first
                   2721: in that branch.
1.70      bowersj2 2722: 
1.217     bowersj2 2723: =item * B<END_BRANCH>:
1.70      bowersj2 2724: 
1.174     albertel 2725: The branch is now done.
1.51      bowersj2 2726: 
                   2727: =back
                   2728: 
1.174     albertel 2729: The tokens are retreivable via methods on the iterator object, i.e.,
                   2730: $iterator->END_MAP.
1.70      bowersj2 2731: 
1.174     albertel 2732: Maps can contain empty resources. The iterator will automatically skip
                   2733: over such resources, but will still treat the structure
                   2734: correctly. Thus, a complicated map with several branches, but
                   2735: consisting entirely of empty resources except for one beginning or
                   2736: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
                   2737: but only one resource will be returned.
1.116     bowersj2 2738: 
1.242     matthew  2739: =back
                   2740: 
1.222     bowersj2 2741: =head2 Normal Usage
                   2742: 
                   2743: Normal usage of the iterator object is to do the following:
                   2744: 
                   2745:  my $it = $navmap->getIterator([your params here]);
                   2746:  my $curRes;
                   2747:  while ($curRes = $it->next()) {
                   2748:    [your logic here]
                   2749:  }
                   2750: 
                   2751: Note that inside of the loop, it's frequently useful to check if
                   2752: "$curRes" is a reference or not with the reference function; only
                   2753: resource objects will be references, and any non-references will 
                   2754: be the tokens described above.
                   2755: 
                   2756: Also note there is some old code floating around that trys to track
                   2757: the depth of the iterator to see when it's done; do not copy that 
                   2758: code. It is difficult to get right and harder to understand then
                   2759: this. They should be migrated to this new style.
1.51      bowersj2 2760: 
                   2761: =cut
                   2762: 
                   2763: # Here are the tokens for the iterator:
                   2764: 
1.222     bowersj2 2765: sub END_ITERATOR { return 0; }
1.51      bowersj2 2766: sub BEGIN_MAP { return 1; }    # begining of a new map
                   2767: sub END_MAP { return 2; }      # end of the map
                   2768: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   2769: sub END_BRANCH { return 4; }   # end of a branch
1.89      bowersj2 2770: sub FORWARD { return 1; }      # go forward
                   2771: sub BACKWARD { return 2; }
1.51      bowersj2 2772: 
1.96      bowersj2 2773: sub min {
                   2774:     (my $a, my $b) = @_;
                   2775:     if ($a < $b) { return $a; } else { return $b; }
                   2776: }
                   2777: 
1.94      bowersj2 2778: sub new {
                   2779:     # magic invocation to create a class instance
                   2780:     my $proto = shift;
                   2781:     my $class = ref($proto) || $proto;
                   2782:     my $self = {};
                   2783: 
1.300     albertel 2784:     weaken($self->{NAV_MAP} = shift);
1.94      bowersj2 2785:     return undef unless ($self->{NAV_MAP});
                   2786: 
                   2787:     # Handle the parameters
                   2788:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   2789:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   2790: 
                   2791:     # If the given resources are just the ID of the resource, get the
                   2792:     # objects
                   2793:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   2794:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   2795:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   2796:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   2797: 
                   2798:     $self->{FILTER} = shift;
                   2799: 
                   2800:     # A hash, used as a set, of resource already seen
                   2801:     $self->{ALREADY_SEEN} = shift;
                   2802:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   2803:     $self->{CONDITION} = shift;
                   2804: 
1.116     bowersj2 2805:     # Do we want to automatically follow "redirection" maps?
                   2806:     $self->{FORCE_TOP} = shift;
                   2807: 
1.162     bowersj2 2808:     # Do we want to return the top-level map object (resource 0.0)?
                   2809:     $self->{RETURN_0} = shift;
                   2810:     # have we done that yet?
                   2811:     $self->{HAVE_RETURNED_0} = 0;
                   2812: 
1.94      bowersj2 2813:     # Now, we need to pre-process the map, by walking forward and backward
                   2814:     # over the parts of the map we're going to look at.
1.96      bowersj2 2815: 
1.97      bowersj2 2816:     # The processing steps are exactly the same, except for a few small 
                   2817:     # changes, so I bundle those up in the following list of two elements:
                   2818:     # (direction_to_iterate, VAL_name, next_resource_method_to_call,
                   2819:     # first_resource).
                   2820:     # This prevents writing nearly-identical code twice.
                   2821:     my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                   2822:                         'FIRST_RESOURCE'],
                   2823:                        [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                   2824:                         'FINISH_RESOURCE'] );
                   2825: 
1.98      bowersj2 2826:     my $maxDepth = 0; # tracks max depth
                   2827: 
1.116     bowersj2 2828:     # If there is only one resource in this map, and it's a map, we
                   2829:     # want to remember that, so the user can ask for the first map
                   2830:     # that isn't just a redirector.
                   2831:     my $resource; my $resourceCount = 0;
                   2832: 
1.209     bowersj2 2833:     # Documentation on this algorithm can be found in the CVS repository at 
                   2834:     # /docs/lonnavdocs; these "**#**" markers correspond to documentation
                   2835:     # in that file.
1.107     bowersj2 2836:     # **1**
                   2837: 
1.97      bowersj2 2838:     foreach my $pass (@iterations) {
                   2839:         my $direction = $pass->[0];
                   2840:         my $valName = $pass->[1];
                   2841:         my $nextResourceMethod = $pass->[2];
                   2842:         my $firstResourceName = $pass->[3];
                   2843: 
                   2844:         my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                   2845:                                                             $self->{FIRST_RESOURCE},
                   2846:                                                             $self->{FINISH_RESOURCE},
                   2847:                                                             {}, undef, 0, $direction);
1.96      bowersj2 2848:     
1.97      bowersj2 2849:         # prime the recursion
                   2850:         $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222     bowersj2 2851: 	$iterator->next();
1.97      bowersj2 2852:         my $curRes = $iterator->next();
1.222     bowersj2 2853: 	my $depth = 1;
                   2854:         while ($depth > 0) {
                   2855: 	    if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
                   2856: 	    if ($curRes == $iterator->END_MAP()) { $depth--; }
                   2857: 
1.97      bowersj2 2858:             if (ref($curRes)) {
1.116     bowersj2 2859:                 # If there's only one resource, this will save it
1.117     bowersj2 2860:                 # we have to filter empty resources from consideration here,
                   2861:                 # or even "empty", redirecting maps have two (start & finish)
                   2862:                 # or three (start, finish, plus redirector)
                   2863:                 if($direction == FORWARD && $curRes->src()) { 
                   2864:                     $resource = $curRes; $resourceCount++; 
                   2865:                 }
1.97      bowersj2 2866:                 my $resultingVal = $curRes->{DATA}->{$valName};
                   2867:                 my $nextResources = $curRes->$nextResourceMethod();
1.116     bowersj2 2868:                 my $nextCount = scalar(@{$nextResources});
1.104     bowersj2 2869: 
1.116     bowersj2 2870:                 if ($nextCount == 1) { # **3**
1.97      bowersj2 2871:                     my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                   2872:                     $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   2873:                 }
                   2874:                 
1.116     bowersj2 2875:                 if ($nextCount > 1) { # **4**
1.97      bowersj2 2876:                     foreach my $res (@{$nextResources}) {
                   2877:                         my $current = $res->{DATA}->{$valName} || 999999999;
                   2878:                         $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                   2879:                     }
                   2880:                 }
                   2881:             }
1.96      bowersj2 2882:             
1.107     bowersj2 2883:             # Assign the final val (**2**)
1.97      bowersj2 2884:             if (ref($curRes) && $direction == BACKWARD()) {
1.98      bowersj2 2885:                 my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
                   2886:                                      $curRes->{DATA}->{BOT_UP_VAL});
                   2887:                 
                   2888:                 $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                   2889:                 if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190     bowersj2 2890:             }
1.222     bowersj2 2891: 
                   2892: 	    $curRes = $iterator->next();
1.96      bowersj2 2893:         }
                   2894:     }
1.94      bowersj2 2895: 
1.116     bowersj2 2896:     # Check: Was this only one resource, a map?
1.255     albertel 2897:     if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) { 
1.116     bowersj2 2898:         my $firstResource = $resource->map_start();
                   2899:         my $finishResource = $resource->map_finish();
                   2900:         return 
                   2901:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   2902:                                               $finishResource, $self->{FILTER},
                   2903:                                               $self->{ALREADY_SEEN}, 
                   2904:                                               $self->{CONDITION}, 0);
                   2905:         
                   2906:     }
                   2907: 
1.98      bowersj2 2908:     # Set up some bookkeeping information.
                   2909:     $self->{CURRENT_DEPTH} = 0;
                   2910:     $self->{MAX_DEPTH} = $maxDepth;
                   2911:     $self->{STACK} = [];
                   2912:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222     bowersj2 2913:     $self->{FINISHED} = 0; # When true, the iterator has finished
1.98      bowersj2 2914: 
                   2915:     for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
                   2916:         push @{$self->{STACK}}, [];
                   2917:     }
                   2918: 
1.107     bowersj2 2919:     # Prime the recursion w/ the first resource **5**
1.98      bowersj2 2920:     push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
                   2921:     $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
                   2922: 
                   2923:     bless ($self);
                   2924: 
                   2925:     return $self;
                   2926: }
                   2927: 
                   2928: sub next {
                   2929:     my $self = shift;
1.256     albertel 2930:     my $closeAllPages=shift;
1.222     bowersj2 2931:     if ($self->{FINISHED}) {
                   2932: 	return END_ITERATOR();
                   2933:     }
                   2934: 
1.162     bowersj2 2935:     # If we want to return the top-level map object, and haven't yet,
                   2936:     # do so.
                   2937:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
                   2938:         $self->{HAVE_RETURNED_0} = 1;
                   2939:         return $self->{NAV_MAP}->getById('0.0');
                   2940:     }
1.98      bowersj2 2941: 
                   2942:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   2943:         # grab the next from the recursive iterator 
1.256     albertel 2944:         my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
1.98      bowersj2 2945: 
                   2946:         # is it a begin or end map? If so, update the depth
                   2947:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   2948:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   2949: 
                   2950:         # Are we back at depth 0? If so, stop recursing
                   2951:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   2952:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   2953:         }
                   2954: 
                   2955:         return $next;
                   2956:     }
                   2957: 
                   2958:     if (defined($self->{FORCE_NEXT})) {
                   2959:         my $tmp = $self->{FORCE_NEXT};
                   2960:         $self->{FORCE_NEXT} = undef;
                   2961:         return $tmp;
                   2962:     }
                   2963: 
                   2964:     # Have we not yet begun? If not, return BEGIN_MAP and
                   2965:     # remember we've started.
                   2966:     if ( !$self->{STARTED} ) { 
                   2967:         $self->{STARTED} = 1;
                   2968:         return $self->BEGIN_MAP();
                   2969:     }
                   2970: 
                   2971:     # Here's the guts of the iterator.
                   2972:     
                   2973:     # Find the next resource, if any.
                   2974:     my $found = 0;
                   2975:     my $i = $self->{MAX_DEPTH};
                   2976:     my $newDepth;
                   2977:     my $here;
                   2978:     while ( $i >= 0 && !$found ) {
1.107     bowersj2 2979:         if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
                   2980:             $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98      bowersj2 2981:             $found = 1;
                   2982:             $newDepth = $i;
                   2983:         }
                   2984:         $i--;
                   2985:     }
                   2986: 
                   2987:     # If we still didn't find anything, we're done.
                   2988:     if ( !$found ) {
                   2989:         # We need to get back down to the correct branch depth
                   2990:         if ( $self->{CURRENT_DEPTH} > 0 ) {
                   2991:             $self->{CURRENT_DEPTH}--;
                   2992:             return END_BRANCH();
                   2993:         } else {
1.222     bowersj2 2994: 	    $self->{FINISHED} = 1;
1.98      bowersj2 2995:             return END_MAP();
                   2996:         }
                   2997:     }
                   2998: 
1.104     bowersj2 2999:     # If this is not a resource, it must be an END_BRANCH marker we want
                   3000:     # to return directly.
1.107     bowersj2 3001:     if (!ref($here)) { # **8**
1.104     bowersj2 3002:         if ($here == END_BRANCH()) { # paranoia, in case of later extension
                   3003:             $self->{CURRENT_DEPTH}--;
                   3004:             return $here;
                   3005:         }
                   3006:     }
                   3007: 
                   3008:     # Otherwise, it is a resource and it's safe to store in $self->{HERE}
                   3009:     $self->{HERE} = $here;
                   3010: 
1.98      bowersj2 3011:     # Get to the right level
                   3012:     if ( $self->{CURRENT_DEPTH} > $newDepth ) {
                   3013:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3014:         $self->{CURRENT_DEPTH}--;
                   3015:         return END_BRANCH();
                   3016:     }
                   3017:     if ( $self->{CURRENT_DEPTH} < $newDepth) {
                   3018:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3019:         $self->{CURRENT_DEPTH}++;
                   3020:         return BEGIN_BRANCH();
                   3021:     }
                   3022: 
                   3023:     # If we made it here, we have the next resource, and we're at the
                   3024:     # right branch level. So let's examine the resource for where
                   3025:     # we can get to from here.
                   3026: 
                   3027:     # So we need to look at all the resources we can get to from here,
                   3028:     # categorize them if we haven't seen them, remember if we have a new
                   3029:     my $nextUnfiltered = $here->getNext();
1.104     bowersj2 3030:     my $maxDepthAdded = -1;
                   3031:     
1.98      bowersj2 3032:     for (@$nextUnfiltered) {
                   3033:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104     bowersj2 3034:             my $depth = $_->{DATA}->{DISPLAY_DEPTH};
                   3035:             push @{$self->{STACK}->[$depth]}, $_;
1.98      bowersj2 3036:             $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104     bowersj2 3037:             if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98      bowersj2 3038:         }
                   3039:     }
1.104     bowersj2 3040: 
                   3041:     # Is this the end of a branch? If so, all of the resources examined above
                   3042:     # led to lower levels then the one we are currently at, so we push a END_BRANCH
                   3043:     # marker onto the stack so we don't forget.
                   3044:     # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
                   3045:     # BC branch and gets to C, it will see F as the only next resource, but it's
                   3046:     # one level lower. Thus, this is the end of the branch, since there are no
                   3047:     # more resources added to this level or above.
1.111     bowersj2 3048:     # We don't do this if the examined resource is the finish resource,
                   3049:     # because the condition given above is true, but the "END_MAP" will
                   3050:     # take care of things and we should already be at depth 0.
1.104     bowersj2 3051:     my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111     bowersj2 3052:     if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104     bowersj2 3053:         push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
                   3054:     }
                   3055: 
1.98      bowersj2 3056:     # That ends the main iterator logic. Now, do we want to recurse
                   3057:     # down this map (if this resource is a map)?
1.256     albertel 3058:     if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
1.98      bowersj2 3059:         (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
                   3060:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3061:         my $firstResource = $self->{HERE}->map_start();
                   3062:         my $finishResource = $self->{HERE}->map_finish();
                   3063: 
                   3064:         $self->{RECURSIVE_ITERATOR} = 
                   3065:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   3066:                                               $finishResource, $self->{FILTER},
                   3067:                                               $self->{ALREADY_SEEN}, $self->{CONDITION});
                   3068:     }
                   3069: 
1.116     bowersj2 3070:     # If this is a blank resource, don't actually return it.
1.117     bowersj2 3071:     # Should you ever find you need it, make sure to add an option to the code
                   3072:     #  that you can use; other things depend on this behavior.
1.138     bowersj2 3073:     my $browsePriv = $self->{HERE}->browsePriv();
                   3074:     if (!$self->{HERE}->src() || 
                   3075:         (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.256     albertel 3076:         return $self->next($closeAllPages);
1.116     bowersj2 3077:     }
                   3078: 
1.98      bowersj2 3079:     return $self->{HERE};
                   3080: 
                   3081: }
                   3082: 
                   3083: =pod
                   3084: 
1.174     albertel 3085: The other method available on the iterator is B<getStack>, which
                   3086: returns an array populated with the current 'stack' of maps, as
                   3087: references to the resource objects. Example: This is useful when
                   3088: making the navigation map, as we need to check whether we are under a
                   3089: page map to see if we need to link directly to the resource, or to the
                   3090: page. The first elements in the array will correspond to the top of
                   3091: the stack (most inclusive map).
1.98      bowersj2 3092: 
                   3093: =cut
                   3094: 
                   3095: sub getStack {
                   3096:     my $self=shift;
                   3097: 
                   3098:     my @stack;
                   3099: 
                   3100:     $self->populateStack(\@stack);
                   3101: 
                   3102:     return \@stack;
                   3103: }
                   3104: 
                   3105: # Private method: Calls the iterators recursively to populate the stack.
                   3106: sub populateStack {
                   3107:     my $self=shift;
                   3108:     my $stack = shift;
                   3109: 
                   3110:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3111: 
                   3112:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3113:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3114:     }
1.94      bowersj2 3115: }
                   3116: 
                   3117: 1;
                   3118: 
                   3119: package Apache::lonnavmaps::DFSiterator;
1.300     albertel 3120: use WeakRef;
1.100     bowersj2 3121: # Not documented in the perldoc: This is a simple iterator that just walks
                   3122: #  through the nav map and presents the resources in a depth-first search
                   3123: #  fashion, ignorant of conditionals, randomized resources, etc. It presents
                   3124: #  BEGIN_MAP and END_MAP, but does not understand branches at all. It is
                   3125: #  useful for pre-processing of some kind, and is in fact used by the main
                   3126: #  iterator that way, but that's about it.
                   3127: # One could imagine merging this into the init routine of the main iterator,
1.251     www      3128: #  but this might as well be left separate, since it is possible some other
1.100     bowersj2 3129: #  use might be found for it. - Jeremy
1.94      bowersj2 3130: 
1.117     bowersj2 3131: # Unlike the main iterator, this DOES return all resources, even blank ones.
                   3132: #  The main iterator needs them to correctly preprocess the map.
                   3133: 
1.94      bowersj2 3134: sub BEGIN_MAP { return 1; }    # begining of a new map
                   3135: sub END_MAP { return 2; }      # end of the map
                   3136: sub FORWARD { return 1; }      # go forward
                   3137: sub BACKWARD { return 2; }
                   3138: 
1.100     bowersj2 3139: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
                   3140: #         filter hash ref (or undef), already seen hash or undef, condition
                   3141: #         (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51      bowersj2 3142: sub new {
                   3143:     # magic invocation to create a class instance
                   3144:     my $proto = shift;
                   3145:     my $class = ref($proto) || $proto;
                   3146:     my $self = {};
                   3147: 
1.300     albertel 3148:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3149:     return undef unless ($self->{NAV_MAP});
                   3150: 
                   3151:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   3152:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   3153: 
                   3154:     # If the given resources are just the ID of the resource, get the
                   3155:     # objects
                   3156:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   3157:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   3158:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   3159:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   3160: 
                   3161:     $self->{FILTER} = shift;
                   3162: 
                   3163:     # A hash, used as a set, of resource already seen
                   3164:     $self->{ALREADY_SEEN} = shift;
1.140     bowersj2 3165:      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63      bowersj2 3166:     $self->{CONDITION} = shift;
1.89      bowersj2 3167:     $self->{DIRECTION} = shift || FORWARD();
1.51      bowersj2 3168: 
1.100     bowersj2 3169:     # Flag: Have we started yet?
1.51      bowersj2 3170:     $self->{STARTED} = 0;
                   3171: 
                   3172:     # Should we continue calling the recursive iterator, if any?
                   3173:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3174:     # The recursive iterator, if any
                   3175:     $self->{RECURSIVE_ITERATOR} = undef;
                   3176:     # Are we recursing on a map, or a branch?
                   3177:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   3178:     # And the count of how deep it is, so that this iterator can keep track of
                   3179:     # when to pick back up again.
                   3180:     $self->{RECURSIVE_DEPTH} = 0;
                   3181: 
                   3182:     # For keeping track of our branches, we maintain our own stack
1.100     bowersj2 3183:     $self->{STACK} = [];
1.51      bowersj2 3184: 
                   3185:     # Start with the first resource
1.89      bowersj2 3186:     if ($self->{DIRECTION} == FORWARD) {
1.100     bowersj2 3187:         push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89      bowersj2 3188:     } else {
1.100     bowersj2 3189:         push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89      bowersj2 3190:     }
1.51      bowersj2 3191: 
                   3192:     bless($self);
                   3193:     return $self;
                   3194: }
                   3195: 
                   3196: sub next {
                   3197:     my $self = shift;
                   3198:     
                   3199:     # Are we using a recursive iterator? If so, pull from that and
                   3200:     # watch the depth; we want to resume our level at the correct time.
1.98      bowersj2 3201:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51      bowersj2 3202:         # grab the next from the recursive iterator
                   3203:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   3204:         
                   3205:         # is it a begin or end map? Update depth if so
                   3206:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3207:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3208: 
                   3209:         # Are we back at depth 0? If so, stop recursing.
                   3210:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3211:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3212:         }
                   3213:         
                   3214:         return $next;
                   3215:     }
                   3216: 
                   3217:     # Is there a current resource to grab? If not, then return
1.100     bowersj2 3218:     # END_MAP, which will end the iterator.
                   3219:     if (scalar(@{$self->{STACK}}) == 0) {
                   3220:         return $self->END_MAP();
1.51      bowersj2 3221:     }
                   3222: 
                   3223:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   3224:     # remember that we've started.
                   3225:     if ( !$self->{STARTED} ) {
                   3226:         $self->{STARTED} = 1;
                   3227:         return $self->BEGIN_MAP;
                   3228:     }
                   3229: 
                   3230:     # Get the next resource in the branch
1.100     bowersj2 3231:     $self->{HERE} = pop @{$self->{STACK}};
1.52      bowersj2 3232: 
1.100     bowersj2 3233:     # remember that we've seen this, so we don't return it again later
1.51      bowersj2 3234:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   3235:     
                   3236:     # Get the next possible resources
1.90      bowersj2 3237:     my $nextUnfiltered;
1.89      bowersj2 3238:     if ($self->{DIRECTION} == FORWARD()) {
1.90      bowersj2 3239:         $nextUnfiltered = $self->{HERE}->getNext();
1.89      bowersj2 3240:     } else {
1.90      bowersj2 3241:         $nextUnfiltered = $self->{HERE}->getPrevious();
1.89      bowersj2 3242:     }
1.51      bowersj2 3243:     my $next = [];
                   3244: 
                   3245:     # filter the next possibilities to remove things we've 
1.100     bowersj2 3246:     # already seen.
1.51      bowersj2 3247:     foreach (@$nextUnfiltered) {
1.52      bowersj2 3248:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
                   3249:             push @$next, $_;
                   3250:         }
1.51      bowersj2 3251:     }
                   3252: 
                   3253:     while (@$next) {
1.100     bowersj2 3254:         # copy the next possibilities over to the stack
                   3255:         push @{$self->{STACK}}, shift @$next;
1.51      bowersj2 3256:     }
                   3257: 
                   3258:     # If this is a map and we want to recurse down it... (not filtered out)
1.70      bowersj2 3259:     if ($self->{HERE}->is_map() && 
1.63      bowersj2 3260:          (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { 
1.51      bowersj2 3261:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3262:         my $firstResource = $self->{HERE}->map_start();
                   3263:         my $finishResource = $self->{HERE}->map_finish();
                   3264: 
                   3265:         $self->{RECURSIVE_ITERATOR} =
1.94      bowersj2 3266:           Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
1.63      bowersj2 3267:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91      bowersj2 3268:                                              $self->{CONDITION}, $self->{DIRECTION});
1.51      bowersj2 3269:     }
                   3270: 
                   3271:     return $self->{HERE};
1.190     bowersj2 3272: }
                   3273: 
                   3274: # Identical to the full iterator methods of the same name. Hate to copy/paste
                   3275: # but I also hate to "inherit" either iterator from the other.
                   3276: 
                   3277: sub getStack {
                   3278:     my $self=shift;
                   3279: 
                   3280:     my @stack;
                   3281: 
                   3282:     $self->populateStack(\@stack);
                   3283: 
                   3284:     return \@stack;
                   3285: }
                   3286: 
                   3287: # Private method: Calls the iterators recursively to populate the stack.
                   3288: sub populateStack {
                   3289:     my $self=shift;
                   3290:     my $stack = shift;
                   3291: 
                   3292:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3293: 
                   3294:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3295:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3296:     }
1.51      bowersj2 3297: }
                   3298: 
1.1       www      3299: 1;
1.2       www      3300: 
1.51      bowersj2 3301: package Apache::lonnavmaps::resource;
1.300     albertel 3302: use WeakRef;
1.51      bowersj2 3303: use Apache::lonnet;
                   3304: 
                   3305: =pod
                   3306: 
1.217     bowersj2 3307: =head1 Object: resource 
1.51      bowersj2 3308: 
1.217     bowersj2 3309: X<resource, navmap object>
1.174     albertel 3310: A resource object encapsulates a resource in a resource map, allowing
                   3311: easy manipulation of the resource, querying the properties of the
                   3312: resource (including user properties), and represents a reference that
                   3313: can be used as the canonical representation of the resource by
                   3314: lonnavmap clients like renderers.
                   3315: 
                   3316: A resource only makes sense in the context of a navmap, as some of the
                   3317: data is stored in the navmap object.
                   3318: 
                   3319: You will probably never need to instantiate this object directly. Use
                   3320: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
                   3321: starting resource.
1.51      bowersj2 3322: 
1.188     bowersj2 3323: Resource objects respect the parameter_hiddenparts, which suppresses 
                   3324: various parts according to the wishes of the map author. As of this
                   3325: writing, there is no way to override this parameter, and suppressed
                   3326: parts will never be returned, nor will their response types or ids be
                   3327: stored.
                   3328: 
1.217     bowersj2 3329: =head2 Overview
1.51      bowersj2 3330: 
1.217     bowersj2 3331: A B<Resource> is the most granular type of object in LON-CAPA that can
                   3332: be included in a course. It can either be a particular resource, like
                   3333: an HTML page, external resource, problem, etc., or it can be a
                   3334: container sequence, such as a "page" or a "map".
                   3335: 
                   3336: To see a sequence from the user's point of view, please see the
                   3337: B<Creating a Course: Maps and Sequences> chapter of the Author's
                   3338: Manual.
                   3339: 
                   3340: A Resource Object, once obtained from a navmap object via a B<getBy*>
                   3341: method of the navmap, or from an iterator, allows you to query
                   3342: information about that resource.
                   3343: 
                   3344: Generally, you do not ever want to create a resource object yourself,
                   3345: so creation has been left undocumented. Always retrieve resources
                   3346: from navmap objects.
                   3347: 
                   3348: =head3 Identifying Resources
                   3349: 
                   3350: X<big hash>Every resource is identified by a Resource ID in the big hash that is
                   3351: unique to that resource for a given course. X<resource ID, in big hash>
                   3352: The Resource ID has the form #.#, where the first number is the same
                   3353: for every resource in a map, and the second is unique. For instance,
                   3354: for a course laid out like this:
                   3355: 
                   3356:  * Problem 1
                   3357:  * Map
                   3358:    * Resource 2
                   3359:    * Resource 3
                   3360: 
                   3361: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
                   3362: C<Resource 3> will share a first number. The second number may end up
                   3363: re-used between the two groups.
                   3364: 
                   3365: The resource ID is only used in the big hash, but can be used in the
                   3366: context of a course to identify a resource easily. (For instance, the
                   3367: printing system uses it to record which resources from a sequence you 
                   3368: wish to print.)
                   3369: 
                   3370: X<symb> X<resource, symb>
                   3371: All resources also have B<symb>s, which uniquely identify a resource
                   3372: in a course. Many internal LON-CAPA functions expect a symb. A symb
                   3373: carries along with it the URL of the resource, and the map it appears
                   3374: in. Symbs are much larger then resource IDs.
1.51      bowersj2 3375: 
                   3376: =cut
                   3377: 
                   3378: sub new {
                   3379:     # magic invocation to create a class instance
                   3380:     my $proto = shift;
                   3381:     my $class = ref($proto) || $proto;
                   3382:     my $self = {};
                   3383: 
1.300     albertel 3384:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3385:     $self->{ID} = shift;
                   3386: 
                   3387:     # Store this new resource in the parent nav map's cache.
                   3388:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66      bowersj2 3389:     $self->{RESOURCE_ERROR} = 0;
1.51      bowersj2 3390: 
                   3391:     # A hash that can be used by two-pass algorithms to store data
                   3392:     # about this resource in. Not used by the resource object
                   3393:     # directly.
                   3394:     $self->{DATA} = {};
                   3395:    
                   3396:     bless($self);
                   3397:     
                   3398:     return $self;
                   3399: }
                   3400: 
1.70      bowersj2 3401: # private function: simplify the NAV_HASH lookups we keep doing
                   3402: # pass the name, and to automatically append my ID, pass a true val on the
                   3403: # second param
                   3404: sub navHash {
                   3405:     my $self = shift;
                   3406:     my $param = shift;
                   3407:     my $id = shift;
1.115     bowersj2 3408:     return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70      bowersj2 3409: }
                   3410: 
1.51      bowersj2 3411: =pod
                   3412: 
1.217     bowersj2 3413: =head2 Methods
1.70      bowersj2 3414: 
1.217     bowersj2 3415: Once you have a resource object, here's what you can do with it:
                   3416: 
                   3417: =head3 Attribute Retrieval
                   3418: 
                   3419: Every resource has certain attributes that can be retrieved and used:
1.70      bowersj2 3420: 
                   3421: =over 4
                   3422: 
1.217     bowersj2 3423: =item * B<ID>: Every resource has an ID that is unique for that
                   3424:     resource in the course it is in. The ID is actually in the hash
                   3425:     representing the resource, so for a resource object $res, obtain
                   3426:     it via C<$res->{ID}).
                   3427: 
1.174     albertel 3428: =item * B<compTitle>:
                   3429: 
                   3430: Returns a "composite title", that is equal to $res->title() if the
                   3431: resource has a title, and is otherwise the last part of the URL (e.g.,
                   3432: "problem.problem").
                   3433: 
                   3434: =item * B<ext>:
                   3435: 
                   3436: Returns true if the resource is external.
                   3437: 
                   3438: =item * B<kind>:
                   3439: 
                   3440: Returns the kind of the resource from the compiled nav map.
                   3441: 
                   3442: =item * B<randomout>:
1.106     bowersj2 3443: 
1.174     albertel 3444: Returns true if this resource was chosen to NOT be shown to the user
                   3445: by the random map selection feature. In other words, this is usually
                   3446: false.
1.70      bowersj2 3447: 
1.174     albertel 3448: =item * B<randompick>:
1.70      bowersj2 3449: 
1.174     albertel 3450: Returns true for a map if the randompick feature is being used on the
                   3451: map. (?)
1.70      bowersj2 3452: 
1.174     albertel 3453: =item * B<src>:
1.51      bowersj2 3454: 
1.174     albertel 3455: Returns the source for the resource.
1.70      bowersj2 3456: 
1.174     albertel 3457: =item * B<symb>:
1.70      bowersj2 3458: 
1.174     albertel 3459: Returns the symb for the resource.
1.70      bowersj2 3460: 
1.174     albertel 3461: =item * B<title>:
1.70      bowersj2 3462: 
1.174     albertel 3463: Returns the title of the resource.
                   3464: 
1.51      bowersj2 3465: =back
                   3466: 
                   3467: =cut
                   3468: 
                   3469: # These info functions can be used directly, as they don't return
                   3470: # resource information.
1.85      bowersj2 3471: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.303     albertel 3472: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
1.70      bowersj2 3473: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85      bowersj2 3474: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217     bowersj2 3475: # considered private and undocumented
1.51      bowersj2 3476: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   3477: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68      bowersj2 3478: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
                   3479: sub randompick { 
                   3480:     my $self = shift;
                   3481:     return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
                   3482:                                                '.0.parameter_randompick'};
                   3483: }
1.303     albertel 3484: sub link {
                   3485:     my $self=shift;
                   3486:     if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
                   3487:     return $self->src;
                   3488: }
1.51      bowersj2 3489: sub src { 
                   3490:     my $self=shift;
                   3491:     return $self->navHash("src_", 1);
                   3492: }
1.303     albertel 3493: sub shown_symb {
                   3494:     my $self=shift;
                   3495:     if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
                   3496:     return $self->symb();
                   3497: }
1.51      bowersj2 3498: sub symb {
                   3499:     my $self=shift;
                   3500:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3501:     my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223     albertel 3502:     my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
1.51      bowersj2 3503:         . '___' . $second . '___' . $symbSrc;
1.223     albertel 3504:     return &Apache::lonnet::symbclean($symb);
1.51      bowersj2 3505: }
1.213     bowersj2 3506: sub title { 
                   3507:     my $self=shift; 
                   3508:     if ($self->{ID} eq '0.0') {
                   3509: 	# If this is the top-level map, return the title of the course
                   3510: 	# since this map can not be titled otherwise.
                   3511: 	return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
                   3512:     }
                   3513:     return $self->navHash("title_", 1); }
1.217     bowersj2 3514: # considered private and undocumented
1.70      bowersj2 3515: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.301     albertel 3516: sub condition {
                   3517:     my $self=shift;
                   3518:     my $undercond=$self->navHash("undercond_", 1);
                   3519:     if (!defined($undercond)) { return 1; };
                   3520:     my $condid=$self->navHash("condid_$undercond");
                   3521:     if (!defined($condid)) { return 1; };
                   3522:     my $condition=&Apache::lonnet::directcondval($condid);
                   3523:     return $condition;
                   3524: }
                   3525: 
1.106     bowersj2 3526: sub compTitle {
                   3527:     my $self = shift;
                   3528:     my $title = $self->title();
1.176     www      3529:     $title=~s/\&colon\;/\:/gs;
1.106     bowersj2 3530:     if (!$title) {
                   3531:         $title = $self->src();
                   3532:         $title = substr($title, rindex($title, '/') + 1);
                   3533:     }
                   3534:     return $title;
                   3535: }
1.70      bowersj2 3536: =pod
                   3537: 
                   3538: B<Predicate Testing the Resource>
                   3539: 
                   3540: These methods are shortcuts to deciding if a given resource has a given property.
                   3541: 
                   3542: =over 4
                   3543: 
1.174     albertel 3544: =item * B<is_map>:
                   3545: 
                   3546: Returns true if the resource is a map type.
                   3547: 
                   3548: =item * B<is_problem>:
1.70      bowersj2 3549: 
1.174     albertel 3550: Returns true if the resource is a problem type, false
                   3551: otherwise. (Looks at the extension on the src field; might need more
                   3552: to work correctly.)
1.70      bowersj2 3553: 
1.174     albertel 3554: =item * B<is_page>:
1.70      bowersj2 3555: 
1.174     albertel 3556: Returns true if the resource is a page.
                   3557: 
                   3558: =item * B<is_sequence>:
                   3559: 
                   3560: Returns true if the resource is a sequence.
1.70      bowersj2 3561: 
                   3562: =back
                   3563: 
                   3564: =cut
                   3565: 
1.256     albertel 3566: sub hasResource {
                   3567:    my $self = shift;
                   3568:    return $self->{NAV_MAP}->hasResource(@_);
                   3569: }
                   3570: 
                   3571: sub retrieveResources {
                   3572:    my $self = shift;
                   3573:    return $self->{NAV_MAP}->retrieveResources(@_);
                   3574: }
1.70      bowersj2 3575: 
                   3576: sub is_html {
1.51      bowersj2 3577:     my $self=shift;
                   3578:     my $src = $self->src();
1.70      bowersj2 3579:     return ($src =~ /html$/);
1.51      bowersj2 3580: }
1.70      bowersj2 3581: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   3582: sub is_page {
1.51      bowersj2 3583:     my $self=shift;
                   3584:     my $src = $self->src();
1.205     bowersj2 3585:     return $self->navHash("is_map_", 1) && 
                   3586: 	$self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51      bowersj2 3587: }
1.70      bowersj2 3588: sub is_problem {
1.51      bowersj2 3589:     my $self=shift;
                   3590:     my $src = $self->src();
1.256     albertel 3591:     return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
                   3592: }
                   3593: sub contains_problem {
                   3594:     my $self=shift;
                   3595:     if ($self->is_page()) {
                   3596: 	my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3597: 	return $hasProblem;
                   3598:     }
                   3599:     return 0;
1.51      bowersj2 3600: }
1.70      bowersj2 3601: sub is_sequence {
1.51      bowersj2 3602:     my $self=shift;
                   3603:     my $src = $self->src();
1.205     bowersj2 3604:     return $self->navHash("is_map_", 1) && 
                   3605: 	$self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51      bowersj2 3606: }
1.261     matthew  3607: sub is_survey {
                   3608:     my $self = shift();
                   3609:     my $part = shift();
1.263     albertel 3610:     if ($self->parmval('type',$part) eq 'survey') {
1.261     matthew  3611:         return 1;
                   3612:     }
1.263     albertel 3613:     if ($self->src() =~ /\.(survey)$/) {
1.261     matthew  3614:         return 1;
                   3615:     }
                   3616:     return 0;
                   3617: }
1.51      bowersj2 3618: 
1.266     raeburn  3619: sub is_empty_sequence {
                   3620:     my $self=shift;
                   3621:     my $src = $self->src();
                   3622:     return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
                   3623: }
                   3624: 
1.101     bowersj2 3625: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51      bowersj2 3626: sub parmval {
                   3627:     my $self = shift;
                   3628:     my $what = shift;
1.185     bowersj2 3629:     my $part = shift;
                   3630:     if (!defined($part)) { 
                   3631:         $part = '0'; 
                   3632:     }
1.51      bowersj2 3633:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   3634: }
                   3635: 
1.70      bowersj2 3636: =pod
                   3637: 
                   3638: B<Map Methods>
                   3639: 
1.174     albertel 3640: These methods are useful for getting information about the map
                   3641: properties of the resource, if the resource is a map (B<is_map>).
1.70      bowersj2 3642: 
                   3643: =over 4
                   3644: 
1.174     albertel 3645: =item * B<map_finish>:
                   3646: 
                   3647: Returns a reference to a resource object corresponding to the finish
                   3648: resource of the map.
1.70      bowersj2 3649: 
1.174     albertel 3650: =item * B<map_pc>:
1.70      bowersj2 3651: 
1.174     albertel 3652: Returns the pc value of the map, which is the first number that
                   3653: appears in the resource ID of the resources in the map, and is the
                   3654: number that appears around the middle of the symbs of the resources in
                   3655: that map.
1.70      bowersj2 3656: 
1.174     albertel 3657: =item * B<map_start>:
                   3658: 
                   3659: Returns a reference to a resource object corresponding to the start
                   3660: resource of the map.
                   3661: 
                   3662: =item * B<map_type>:
                   3663: 
                   3664: Returns a string with the type of the map in it.
1.70      bowersj2 3665: 
                   3666: =back
1.51      bowersj2 3667: 
1.70      bowersj2 3668: =cut
1.51      bowersj2 3669: 
                   3670: sub map_finish {
                   3671:     my $self = shift;
                   3672:     my $src = $self->src();
1.144     bowersj2 3673:     $src = Apache::lonnet::clutter($src);
1.51      bowersj2 3674:     my $res = $self->navHash("map_finish_$src", 0);
                   3675:     $res = $self->{NAV_MAP}->getById($res);
                   3676:     return $res;
                   3677: }
1.70      bowersj2 3678: sub map_pc {
                   3679:     my $self = shift;
                   3680:     my $src = $self->src();
                   3681:     return $self->navHash("map_pc_$src", 0);
                   3682: }
1.51      bowersj2 3683: sub map_start {
                   3684:     my $self = shift;
                   3685:     my $src = $self->src();
1.144     bowersj2 3686:     $src = Apache::lonnet::clutter($src);
1.51      bowersj2 3687:     my $res = $self->navHash("map_start_$src", 0);
                   3688:     $res = $self->{NAV_MAP}->getById($res);
                   3689:     return $res;
                   3690: }
                   3691: sub map_type {
                   3692:     my $self = shift;
                   3693:     my $pc = $self->map_pc();
                   3694:     return $self->navHash("map_type_$pc", 0);
                   3695: }
                   3696: 
                   3697: #####
                   3698: # Property queries
                   3699: #####
                   3700: 
                   3701: # These functions will be responsible for returning the CORRECT
                   3702: # VALUE for the parameter, no matter what. So while they may look
                   3703: # like direct calls to parmval, they can be more then that.
                   3704: # So, for instance, the duedate function should use the "duedatetype"
                   3705: # information, rather then the resource object user.
                   3706: 
                   3707: =pod
                   3708: 
                   3709: =head2 Resource Parameters
                   3710: 
1.174     albertel 3711: In order to use the resource parameters correctly, the nav map must
                   3712: have been instantiated with genCourseAndUserOptions set to true, so
                   3713: the courseopt and useropt is read correctly. Then, you can call these
                   3714: functions to get the relevant parameters for the resource. Each
                   3715: function defaults to part "0", but can be directed to another part by
                   3716: passing the part as the parameter.
                   3717: 
                   3718: These methods are responsible for getting the parameter correct, not
                   3719: merely reflecting the contents of the GDBM hashes. As we move towards
                   3720: dates relative to other dates, these methods should be updated to
                   3721: reflect that. (Then, anybody using these methods will not have to update
                   3722: their code.)
                   3723: 
                   3724: =over 4
                   3725: 
                   3726: =item * B<acc>:
                   3727: 
                   3728: Get the Client IP/Name Access Control information.
1.51      bowersj2 3729: 
1.174     albertel 3730: =item * B<answerdate>:
1.51      bowersj2 3731: 
1.174     albertel 3732: Get the answer-reveal date for the problem.
                   3733: 
1.211     bowersj2 3734: =item * B<awarded>: 
                   3735: 
                   3736: Gets the awarded value for the problem part. Requires genUserData set to
                   3737: true when the navmap object was created.
                   3738: 
1.174     albertel 3739: =item * B<duedate>:
                   3740: 
                   3741: Get the due date for the problem.
                   3742: 
                   3743: =item * B<tries>:
                   3744: 
                   3745: Get the number of tries the student has used on the problem.
                   3746: 
                   3747: =item * B<maxtries>:
                   3748: 
                   3749: Get the number of max tries allowed.
                   3750: 
                   3751: =item * B<opendate>:
1.51      bowersj2 3752: 
1.174     albertel 3753: Get the open date for the problem.
1.51      bowersj2 3754: 
1.174     albertel 3755: =item * B<sig>:
1.51      bowersj2 3756: 
1.174     albertel 3757: Get the significant figures setting.
1.51      bowersj2 3758: 
1.174     albertel 3759: =item * B<tol>:
1.51      bowersj2 3760: 
1.174     albertel 3761: Get the tolerance for the problem.
1.51      bowersj2 3762: 
1.174     albertel 3763: =item * B<tries>:
1.51      bowersj2 3764: 
1.174     albertel 3765: Get the number of tries the user has already used on the problem.
1.51      bowersj2 3766: 
1.174     albertel 3767: =item * B<type>:
1.51      bowersj2 3768: 
1.174     albertel 3769: Get the question type for the problem.
1.70      bowersj2 3770: 
1.174     albertel 3771: =item * B<weight>:
1.51      bowersj2 3772: 
1.174     albertel 3773: Get the weight for the problem.
1.51      bowersj2 3774: 
                   3775: =back
                   3776: 
                   3777: =cut
                   3778: 
                   3779: sub acc {
                   3780:     (my $self, my $part) = @_;
                   3781:     return $self->parmval("acc", $part);
                   3782: }
                   3783: sub answerdate {
                   3784:     (my $self, my $part) = @_;
                   3785:     # Handle intervals
                   3786:     if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
                   3787:         return $self->duedate($part) + 
                   3788:             $self->parmval("answerdate", $part);
                   3789:     }
                   3790:     return $self->parmval("answerdate", $part);
1.106     bowersj2 3791: }
1.211     bowersj2 3792: sub awarded { 
                   3793:     my $self = shift; my $part = shift;
1.221     bowersj2 3794:     $self->{NAV_MAP}->get_user_data();
1.211     bowersj2 3795:     if (!defined($part)) { $part = '0'; }
                   3796:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
                   3797: }
1.51      bowersj2 3798: sub duedate {
                   3799:     (my $self, my $part) = @_;
1.260     albertel 3800:     my $interval=$self->parmval("interval", $part);
                   3801:     if ($interval) {
                   3802: 	my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
                   3803: 	if ($first_access) { return ($first_access+$interval); }
                   3804:     }
1.51      bowersj2 3805:     return $self->parmval("duedate", $part);
                   3806: }
                   3807: sub maxtries {
                   3808:     (my $self, my $part) = @_;
                   3809:     return $self->parmval("maxtries", $part);
                   3810: }
                   3811: sub opendate {
                   3812:     (my $self, my $part) = @_;
                   3813:     if ($self->parmval("opendate.type", $part) eq 'date_interval') {
                   3814:         return $self->duedate($part) -
                   3815:             $self->parmval("opendate", $part);
                   3816:     }
                   3817:     return $self->parmval("opendate");
                   3818: }
1.185     bowersj2 3819: sub problemstatus {
                   3820:     (my $self, my $part) = @_;
1.236     bowersj2 3821:     return lc $self->parmval("problemstatus", $part);
1.185     bowersj2 3822: }
1.51      bowersj2 3823: sub sig {
                   3824:     (my $self, my $part) = @_;
                   3825:     return $self->parmval("sig", $part);
                   3826: }
                   3827: sub tol {
                   3828:     (my $self, my $part) = @_;
                   3829:     return $self->parmval("tol", $part);
                   3830: }
1.108     bowersj2 3831: sub tries { 
                   3832:     my $self = shift; 
                   3833:     my $tries = $self->queryRestoreHash('tries', shift);
                   3834:     if (!defined($tries)) { return '0';}
1.51      bowersj2 3835:     return $tries;
                   3836: }
1.70      bowersj2 3837: sub type {
                   3838:     (my $self, my $part) = @_;
                   3839:     return $self->parmval("type", $part);
                   3840: }
1.109     bowersj2 3841: sub weight { 
                   3842:     my $self = shift; my $part = shift;
1.211     bowersj2 3843:     if (!defined($part)) { $part = '0'; }
                   3844:     return &Apache::lonnet::EXT('resource.'.$part.'.weight',
                   3845: 				$self->symb(), $ENV{'user.domain'},
                   3846: 				$ENV{'user.name'}, 
                   3847: 				$ENV{'request.course.sec'});
1.274     matthew  3848: }
                   3849: sub part_display {
                   3850:     my $self= shift(); my $partID = shift();
                   3851:     if (! defined($partID)) { $partID = '0'; }
                   3852:     my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
                   3853:                                      $self->symb);
                   3854:     if (! defined($display) || $display eq '') {
                   3855:         $display = $partID;
                   3856:     }
                   3857:     return $display;
1.70      bowersj2 3858: }
1.51      bowersj2 3859: 
                   3860: # Multiple things need this
                   3861: sub getReturnHash {
                   3862:     my $self = shift;
                   3863:     
                   3864:     if (!defined($self->{RETURN_HASH})) {
1.84      bowersj2 3865:         my %tmpHash  = &Apache::lonnet::restore($self->symb());
1.51      bowersj2 3866:         $self->{RETURN_HASH} = \%tmpHash;
                   3867:     }
                   3868: }       
                   3869: 
                   3870: ######
                   3871: # Status queries
                   3872: ######
                   3873: 
                   3874: # These methods query the status of problems.
                   3875: 
                   3876: # If we need to count parts, this function determines the number of
                   3877: # parts from the metadata. When called, it returns a reference to a list
                   3878: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   3879: # tells you how many parts you have in the problem:
                   3880: # $partcount = scalar($resource->countParts());
                   3881: # Don't use $self->{PARTS} directly because you don't know if it's been
                   3882: # computed yet.
                   3883: 
                   3884: =pod
                   3885: 
                   3886: =head2 Resource misc
                   3887: 
                   3888: Misc. functions for the resource.
                   3889: 
                   3890: =over 4
                   3891: 
1.174     albertel 3892: =item * B<hasDiscussion>:
1.59      bowersj2 3893: 
1.174     albertel 3894: Returns a false value if there has been discussion since the user last
                   3895: logged in, true if there has. Always returns false if the discussion
                   3896: data was not extracted when the nav map was constructed.
                   3897: 
                   3898: =item * B<getFeedback>:
                   3899: 
                   3900: Gets the feedback for the resource and returns the raw feedback string
                   3901: for the resource, or the null string if there is no feedback or the
                   3902: email data was not extracted when the nav map was constructed. Usually
                   3903: used like this:
1.59      bowersj2 3904: 
                   3905:  for (split(/\,/, $res->getFeedback())) {
                   3906:     my $link = &Apache::lonnet::escape($_);
                   3907:     ...
                   3908: 
                   3909: and use the link as appropriate.
                   3910: 
                   3911: =cut
                   3912: 
                   3913: sub hasDiscussion {
                   3914:     my $self = shift;
                   3915:     return $self->{NAV_MAP}->hasDiscussion($self->symb());
                   3916: }
                   3917: 
                   3918: sub getFeedback {
                   3919:     my $self = shift;
1.124     bowersj2 3920:     my $source = $self->src();
1.125     bowersj2 3921:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124     bowersj2 3922:     return $self->{NAV_MAP}->getFeedback($source);
                   3923: }
                   3924: 
                   3925: sub getErrors {
                   3926:     my $self = shift;
                   3927:     my $source = $self->src();
                   3928:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
                   3929:     return $self->{NAV_MAP}->getErrors($source);
1.59      bowersj2 3930: }
                   3931: 
                   3932: =pod
                   3933: 
1.174     albertel 3934: =item * B<parts>():
1.51      bowersj2 3935: 
1.174     albertel 3936: Returns a list reference containing sorted strings corresponding to
1.193     bowersj2 3937: each part of the problem. Single part problems have only a part '0'.
                   3938: Multipart problems do not return their part '0', since they typically
                   3939: do not really matter. 
1.174     albertel 3940: 
                   3941: =item * B<countParts>():
                   3942: 
                   3943: Returns the number of parts of the problem a student can answer. Thus,
                   3944: for single part problems, returns 1. For multipart, it returns the
1.193     bowersj2 3945: number of parts in the problem, not including psuedo-part 0. 
1.51      bowersj2 3946: 
1.290     matthew  3947: =item * B<countResponses>():
                   3948: 
                   3949: Returns the total number of responses in the problem a student can answer.
                   3950: 
                   3951: =item * B<responseTypes>():
                   3952: 
                   3953: Returns a hash whose keys are the response types.  The values are the number 
                   3954: of times each response type is used.  This is for the I<entire> problem, not 
                   3955: just a single part.
                   3956: 
1.192     bowersj2 3957: =item * B<multipart>():
                   3958: 
1.193     bowersj2 3959: Returns true if the problem is multipart, false otherwise. Use this instead
                   3960: of countParts if all you want is multipart/not multipart.
1.192     bowersj2 3961: 
1.187     bowersj2 3962: =item * B<responseType>($part):
                   3963: 
                   3964: Returns the response type of the part, without the word "response" on the
                   3965: end. Example return values: 'string', 'essay', 'numeric', etc.
                   3966: 
1.193     bowersj2 3967: =item * B<responseIds>($part):
1.187     bowersj2 3968: 
1.193     bowersj2 3969: Retreives the response IDs for the given part as an array reference containing
                   3970: strings naming the response IDs. This may be empty.
1.187     bowersj2 3971: 
1.51      bowersj2 3972: =back
                   3973: 
                   3974: =cut
                   3975: 
                   3976: sub parts {
                   3977:     my $self = shift;
                   3978: 
1.192     bowersj2 3979:     if ($self->ext) { return []; }
1.67      bowersj2 3980: 
1.51      bowersj2 3981:     $self->extractParts();
                   3982:     return $self->{PARTS};
                   3983: }
                   3984: 
                   3985: sub countParts {
                   3986:     my $self = shift;
                   3987:     
                   3988:     my $parts = $self->parts();
1.191     bowersj2 3989: 
                   3990:     # If I left this here, then it's not necessary.
                   3991:     #my $delta = 0;
                   3992:     #for my $part (@$parts) {
                   3993:     #    if ($part eq '0') { $delta--; }
                   3994:     #}
1.66      bowersj2 3995: 
                   3996:     if ($self->{RESOURCE_ERROR}) {
                   3997:         return 0;
                   3998:     }
                   3999: 
1.191     bowersj2 4000:     return scalar(@{$parts}); # + $delta;
1.192     bowersj2 4001: }
                   4002: 
1.290     matthew  4003: sub countResponses {
                   4004:     my $self = shift;
                   4005:     my $count;
1.293     matthew  4006:     foreach my $part (@{$self->parts()}) {
                   4007:         $count+= scalar($self->responseIds($part));
1.290     matthew  4008:     }
                   4009:     return $count;
                   4010: }
                   4011: 
                   4012: sub responseTypes {
                   4013:     my $self = shift;
1.291     albertel 4014:     my %responses;
1.290     matthew  4015:     foreach my $part ($self->parts()) {
                   4016:         foreach my $responsetype ($self->responseType($part)) {
1.291     albertel 4017:             $responses{$responsetype}++ if (defined($responsetype));
1.290     matthew  4018:         }
                   4019:     }
1.291     albertel 4020:     return %responses;
1.290     matthew  4021: }
                   4022: 
1.192     bowersj2 4023: sub multipart {
                   4024:     my $self = shift;
                   4025:     return $self->countParts() > 1;
1.51      bowersj2 4026: }
                   4027: 
1.225     bowersj2 4028: sub singlepart {
                   4029:     my $self = shift;
                   4030:     return $self->countParts() == 1;
                   4031: }
                   4032: 
1.187     bowersj2 4033: sub responseType {
1.184     bowersj2 4034:     my $self = shift;
                   4035:     my $part = shift;
                   4036: 
                   4037:     $self->extractParts();
1.235     albertel 4038:     if (defined($self->{RESPONSE_TYPES}->{$part})) {
                   4039: 	return @{$self->{RESPONSE_TYPES}->{$part}};
                   4040:     } else {
                   4041: 	return undef;
                   4042:     }
1.187     bowersj2 4043: }
                   4044: 
1.193     bowersj2 4045: sub responseIds {
1.187     bowersj2 4046:     my $self = shift;
                   4047:     my $part = shift;
                   4048: 
                   4049:     $self->extractParts();
1.235     albertel 4050:     if (defined($self->{RESPONSE_IDS}->{$part})) {
                   4051: 	return @{$self->{RESPONSE_IDS}->{$part}};
                   4052:     } else {
                   4053: 	return undef;
                   4054:     }
1.184     bowersj2 4055: }
                   4056: 
                   4057: # Private function: Extracts the parts information, both part names and
1.187     bowersj2 4058: # part types, and saves it. 
1.51      bowersj2 4059: sub extractParts { 
                   4060:     my $self = shift;
                   4061:     
1.153     bowersj2 4062:     return if (defined($self->{PARTS}));
1.67      bowersj2 4063:     return if ($self->ext);
1.51      bowersj2 4064: 
                   4065:     $self->{PARTS} = [];
                   4066: 
1.181     bowersj2 4067:     my %parts;
                   4068: 
1.82      bowersj2 4069:     # Retrieve part count, if this is a problem
                   4070:     if ($self->is_problem()) {
1.240     albertel 4071: 	my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152     matthew  4072:         my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181     bowersj2 4073: 
1.239     bowersj2 4074: 	if ($partorder) {
                   4075: 	    my @parts;
                   4076: 	    for my $part (split (/,/,$partorder)) {
                   4077: 		if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4078: 		    push @parts, $part;
1.241     albertel 4079: 		    $parts{$part} = 1;
1.239     bowersj2 4080: 		}
                   4081: 	    }
                   4082: 	    $self->{PARTS} = \@parts;
                   4083: 	} else {
                   4084: 	    if (!$metadata) {
                   4085: 		$self->{RESOURCE_ERROR} = 1;
                   4086: 		$self->{PARTS} = [];
                   4087: 		$self->{PART_TYPE} = {};
                   4088: 		return;
                   4089: 	    }
                   4090: 	    foreach (split(/\,/,$metadata)) {
                   4091: 		if ($_ =~ /^part_(.*)$/) {
                   4092: 		    my $part = $1;
                   4093: 		    # This floods the logs if it blows up
                   4094: 		    if (defined($parts{$part})) {
1.241     albertel 4095: 			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
                   4096: 		    }
1.239     bowersj2 4097: 		    
                   4098: 		    # check to see if part is turned off.
                   4099: 		    
                   4100: 		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4101: 			$parts{$part} = 1;
                   4102: 		    }
                   4103: 		}
                   4104: 	    }
                   4105: 	    my @sortedParts = sort keys %parts;
                   4106: 	    $self->{PARTS} = \@sortedParts;
1.51      bowersj2 4107:         }
1.82      bowersj2 4108:         
1.187     bowersj2 4109: 
1.284     matthew  4110:         # These hashes probably do not need names that end with "Hash"....
1.187     bowersj2 4111:         my %responseIdHash;
                   4112:         my %responseTypeHash;
                   4113: 
1.189     bowersj2 4114: 
                   4115:         # Init the responseIdHash
                   4116:         foreach (@{$self->{PARTS}}) {
                   4117:             $responseIdHash{$_} = [];
                   4118:         }
                   4119: 
1.187     bowersj2 4120:         # Now, the unfortunate thing about this is that parts, part name, and
1.239     bowersj2 4121:         # response id are delimited by underscores, but both the part
1.187     bowersj2 4122:         # name and response id can themselves have underscores in them.
                   4123:         # So we have to use our knowlege of part names to figure out 
                   4124:         # where the part names begin and end, and even then, it is possible
                   4125:         # to construct ambiguous situations.
                   4126:         foreach (split /,/, $metadata) {
                   4127:             if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
                   4128:                 my $responseType = $1;
                   4129:                 my $partStuff = $2;
                   4130:                 my $partIdSoFar = '';
                   4131:                 my @partChunks = split /_/, $partStuff;
                   4132:                 my $i = 0;
                   4133:                 for ($i = 0; $i < scalar(@partChunks); $i++) {
                   4134:                     if ($partIdSoFar) { $partIdSoFar .= '_'; }
                   4135:                     $partIdSoFar .= $partChunks[$i];
                   4136:                     if ($parts{$partIdSoFar}) {
                   4137:                         my @otherChunks = @partChunks[$i+1..$#partChunks];
                   4138:                         my $responseId = join('_', @otherChunks);
1.188     bowersj2 4139:                         push @{$responseIdHash{$partIdSoFar}}, $responseId;
1.233     matthew  4140:                         push @{$responseTypeHash{$partIdSoFar}}, $responseType;
1.187     bowersj2 4141:                     }
                   4142:                 }
                   4143:             }
                   4144:         }
1.264     albertel 4145: 	my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
1.284     matthew  4146:         #
                   4147:         # Reorder the arrays in the %responseIdHash and %responseTypeHash
1.264     albertel 4148: 	if ($resorder) {
                   4149: 	    my @resorder=split(/,/,$resorder);
                   4150: 	    foreach my $part (keys(%responseIdHash)) {
1.286     albertel 4151: 		my $i=0;
                   4152: 		my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
1.264     albertel 4153: 		my @neworder;
                   4154: 		foreach my $possibleid (@resorder) {
                   4155: 		    if (exists($resids{$possibleid})) {
1.286     albertel 4156: 			push(@neworder,$resids{$possibleid});
1.264     albertel 4157: 		    }
                   4158: 		}
1.286     albertel 4159: 		my @ids;
                   4160: 		my @type;
                   4161: 		foreach my $element (@neworder) {
                   4162: 		    push (@ids,$responseIdHash{$part}->[$element]);
                   4163: 		    push (@type,$responseTypeHash{$part}->[$element]);
                   4164: 		}
                   4165: 		$responseIdHash{$part}=\@ids;
                   4166: 		$responseTypeHash{$part}=\@type;
1.264     albertel 4167: 	    }
                   4168: 	}
1.187     bowersj2 4169:         $self->{RESPONSE_IDS} = \%responseIdHash;
                   4170:         $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154     bowersj2 4171:     }
                   4172: 
1.51      bowersj2 4173:     return;
                   4174: }
                   4175: 
                   4176: =pod
                   4177: 
                   4178: =head2 Resource Status
                   4179: 
1.174     albertel 4180: Problem resources have status information, reflecting their various
                   4181: dates and completion statuses.
1.51      bowersj2 4182: 
1.174     albertel 4183: There are two aspects to the status: the date-related information and
                   4184: the completion information.
1.51      bowersj2 4185: 
1.174     albertel 4186: Idiomatic usage of these two methods would probably look something
                   4187: like
1.51      bowersj2 4188: 
                   4189:  foreach ($resource->parts()) {
                   4190:     my $dateStatus = $resource->getDateStatus($_);
                   4191:     my $completionStatus = $resource->getCompletionStatus($_);
                   4192: 
1.70      bowersj2 4193:     or
                   4194: 
                   4195:     my $status = $resource->status($_);
                   4196: 
1.51      bowersj2 4197:     ... use it here ...
                   4198:  }
                   4199: 
1.174     albertel 4200: Which you use depends on exactly what you are looking for. The
                   4201: status() function has been optimized for the nav maps display and may
                   4202: not precisely match what you need elsewhere.
1.101     bowersj2 4203: 
1.174     albertel 4204: The symbolic constants shown below can be accessed through the
                   4205: resource object: C<$res->OPEN>.
1.101     bowersj2 4206: 
1.51      bowersj2 4207: =over 4
                   4208: 
1.174     albertel 4209: =item * B<getDateStatus>($part):
                   4210: 
                   4211: ($part defaults to 0). A convenience function that returns a symbolic
                   4212: constant telling you about the date status of the part. The possible
                   4213: return values are:
1.51      bowersj2 4214: 
                   4215: =back
                   4216: 
                   4217: B<Date Codes>
                   4218: 
                   4219: =over 4
                   4220: 
1.174     albertel 4221: =item * B<OPEN_LATER>:
                   4222: 
                   4223: The problem will be opened later.
                   4224: 
                   4225: =item * B<OPEN>:
                   4226: 
                   4227: Open and not yet due.
                   4228: 
1.51      bowersj2 4229: 
1.174     albertel 4230: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4231: 
1.174     albertel 4232: The due date has passed, but the answer date has not yet arrived.
1.59      bowersj2 4233: 
1.174     albertel 4234: =item * B<PAST_DUE_NO_ANSWER>:
1.54      bowersj2 4235: 
1.174     albertel 4236: The due date has passed and there is no answer opening date set.
1.51      bowersj2 4237: 
1.174     albertel 4238: =item * B<ANSWER_OPEN>:
1.51      bowersj2 4239: 
1.174     albertel 4240: The answer date is here.
                   4241: 
                   4242: =item * B<NETWORK_FAILURE>:
                   4243: 
                   4244: The information is unknown due to network failure.
1.51      bowersj2 4245: 
                   4246: =back
                   4247: 
                   4248: =cut
                   4249: 
                   4250: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 4251: sub OPEN_LATER             { return 0; }
                   4252: sub OPEN                   { return 1; }
                   4253: sub PAST_DUE_NO_ANSWER     { return 2; }
                   4254: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   4255: sub ANSWER_OPEN            { return 4; }
                   4256: sub NOTHING_SET            { return 5; } 
                   4257: sub NETWORK_FAILURE        { return 100; }
                   4258: 
                   4259: # getDateStatus gets the date status for a given problem part. 
                   4260: # Because answer date, due date, and open date are fully independent
                   4261: # (i.e., it is perfectly possible to *only* have an answer date), 
                   4262: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   4263: # (past, future, none given). This function handles this with a decision
                   4264: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 4265: 
                   4266: sub getDateStatus {
                   4267:     my $self = shift;
                   4268:     my $part = shift;
                   4269:     $part = "0" if (!defined($part));
1.54      bowersj2 4270: 
                   4271:     # Always return network failure if there was one.
1.51      bowersj2 4272:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4273: 
                   4274:     my $now = time();
                   4275: 
1.53      bowersj2 4276:     my $open = $self->opendate($part);
                   4277:     my $due = $self->duedate($part);
                   4278:     my $answer = $self->answerdate($part);
                   4279: 
                   4280:     if (!$open && !$due && !$answer) {
                   4281:         # no data on the problem at all
                   4282:         # should this be the same as "open later"? think multipart.
                   4283:         return $self->NOTHING_SET;
                   4284:     }
1.59      bowersj2 4285:     if (!$open || $now < $open) {return $self->OPEN_LATER}
                   4286:     if (!$due || $now < $due) {return $self->OPEN}
                   4287:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
                   4288:     if ($answer) { return $self->ANSWER_OPEN; }
1.54      bowersj2 4289:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 4290: }
                   4291: 
                   4292: =pod
                   4293: 
                   4294: B<>
                   4295: 
                   4296: =over 4
                   4297: 
1.174     albertel 4298: =item * B<getCompletionStatus>($part):
1.51      bowersj2 4299: 
1.174     albertel 4300: ($part defaults to 0.) A convenience function that returns a symbolic
                   4301: constant telling you about the completion status of the part, with the
                   4302: following possible results:
                   4303: 
                   4304: =back
1.51      bowersj2 4305: 
                   4306: B<Completion Codes>
                   4307: 
                   4308: =over 4
                   4309: 
1.174     albertel 4310: =item * B<NOT_ATTEMPTED>:
                   4311: 
                   4312: Has not been attempted at all.
                   4313: 
                   4314: =item * B<INCORRECT>:
                   4315: 
                   4316: Attempted, but wrong by student.
1.51      bowersj2 4317: 
1.174     albertel 4318: =item * B<INCORRECT_BY_OVERRIDE>:
1.51      bowersj2 4319: 
1.174     albertel 4320: Attempted, but wrong by instructor override.
1.51      bowersj2 4321: 
1.174     albertel 4322: =item * B<CORRECT>:
1.51      bowersj2 4323: 
1.174     albertel 4324: Correct or correct by instructor.
1.51      bowersj2 4325: 
1.174     albertel 4326: =item * B<CORRECT_BY_OVERRIDE>:
1.51      bowersj2 4327: 
1.174     albertel 4328: Correct by instructor override.
1.51      bowersj2 4329: 
1.174     albertel 4330: =item * B<EXCUSED>:
                   4331: 
                   4332: Excused. Not yet implemented.
                   4333: 
                   4334: =item * B<NETWORK_FAILURE>:
                   4335: 
                   4336: Information not available due to network failure.
                   4337: 
                   4338: =item * B<ATTEMPTED>:
                   4339: 
                   4340: Attempted, and not yet graded.
1.69      bowersj2 4341: 
1.51      bowersj2 4342: =back
                   4343: 
                   4344: =cut
                   4345: 
1.53      bowersj2 4346: sub NOT_ATTEMPTED         { return 10; }
                   4347: sub INCORRECT             { return 11; }
                   4348: sub INCORRECT_BY_OVERRIDE { return 12; }
                   4349: sub CORRECT               { return 13; }
                   4350: sub CORRECT_BY_OVERRIDE   { return 14; }
                   4351: sub EXCUSED               { return 15; }
1.69      bowersj2 4352: sub ATTEMPTED             { return 16; }
1.51      bowersj2 4353: 
                   4354: sub getCompletionStatus {
                   4355:     my $self = shift;
                   4356:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4357: 
1.108     bowersj2 4358:     my $status = $self->queryRestoreHash('solved', shift);
1.51      bowersj2 4359: 
1.251     www      4360:     # Left as separate if statements in case we ever do more with this
1.51      bowersj2 4361:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
1.288     albertel 4362:     if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
1.51      bowersj2 4363:     if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
                   4364:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   4365:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   4366:     if ($status eq 'excused') {return $self->EXCUSED; }
1.69      bowersj2 4367:     if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51      bowersj2 4368:     return $self->NOT_ATTEMPTED;
1.108     bowersj2 4369: }
                   4370: 
                   4371: sub queryRestoreHash {
                   4372:     my $self = shift;
                   4373:     my $hashentry = shift;
                   4374:     my $part = shift;
1.185     bowersj2 4375:     $part = "0" if (!defined($part) || $part eq '');
1.108     bowersj2 4376:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4377: 
                   4378:     $self->getReturnHash();
                   4379: 
                   4380:     return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51      bowersj2 4381: }
                   4382: 
                   4383: =pod
                   4384: 
                   4385: B<Composite Status>
                   4386: 
1.174     albertel 4387: Along with directly returning the date or completion status, the
                   4388: resource object includes a convenience function B<status>() that will
                   4389: combine the two status tidbits into one composite status that can
1.191     bowersj2 4390: represent the status of the resource as a whole. This method represents
                   4391: the concept of the thing we want to display to the user on the nav maps
                   4392: screen, which is a combination of completion and open status. The precise logic is
1.174     albertel 4393: documented in the comments of the status method. The following results
                   4394: may be returned, all available as methods on the resource object
1.185     bowersj2 4395: ($res->NETWORK_FAILURE): In addition to the return values that match
                   4396: the date or completion status, this function can return "ANSWER_SUBMITTED"
                   4397: if that problemstatus parameter value is set to No, suppressing the
                   4398: incorrect/correct feedback.
1.51      bowersj2 4399: 
                   4400: =over 4
                   4401: 
1.174     albertel 4402: =item * B<NETWORK_FAILURE>:
                   4403: 
                   4404: The network has failed and the information is not available.
1.51      bowersj2 4405: 
1.174     albertel 4406: =item * B<NOTHING_SET>:
1.53      bowersj2 4407: 
1.174     albertel 4408: No dates have been set for this problem (part) at all. (Because only
                   4409: certain parts of a multi-part problem may be assigned, this can not be
                   4410: collapsed into "open later", as we do not know a given part will EVER
                   4411: be opened. For single part, this is the same as "OPEN_LATER".)
1.51      bowersj2 4412: 
1.174     albertel 4413: =item * B<CORRECT>:
1.51      bowersj2 4414: 
1.174     albertel 4415: For any reason at all, the part is considered correct.
1.54      bowersj2 4416: 
1.174     albertel 4417: =item * B<EXCUSED>:
1.51      bowersj2 4418: 
1.174     albertel 4419: For any reason at all, the problem is excused.
1.51      bowersj2 4420: 
1.174     albertel 4421: =item * B<PAST_DUE_NO_ANSWER>:
1.51      bowersj2 4422: 
1.174     albertel 4423: The problem is past due, not considered correct, and no answer date is
                   4424: set.
1.51      bowersj2 4425: 
1.174     albertel 4426: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4427: 
1.174     albertel 4428: The problem is past due, not considered correct, and an answer date in
                   4429: the future is set.
1.51      bowersj2 4430: 
1.174     albertel 4431: =item * B<ANSWER_OPEN>:
                   4432: 
                   4433: The problem is past due, not correct, and the answer is now available.
                   4434: 
                   4435: =item * B<OPEN_LATER>:
                   4436: 
                   4437: The problem is not yet open.
                   4438: 
                   4439: =item * B<TRIES_LEFT>:
                   4440: 
                   4441: The problem is open, has been tried, is not correct, but there are
                   4442: tries left.
                   4443: 
                   4444: =item * B<INCORRECT>:
                   4445: 
                   4446: The problem is open, and all tries have been used without getting the
                   4447: correct answer.
                   4448: 
                   4449: =item * B<OPEN>:
                   4450: 
                   4451: The item is open and not yet tried.
                   4452: 
                   4453: =item * B<ATTEMPTED>:
                   4454: 
                   4455: The problem has been attempted.
1.69      bowersj2 4456: 
1.185     bowersj2 4457: =item * B<ANSWER_SUBMITTED>:
                   4458: 
                   4459: An answer has been submitted, but the student should not see it.
                   4460: 
1.51      bowersj2 4461: =back
                   4462: 
                   4463: =cut
                   4464: 
1.185     bowersj2 4465: sub TRIES_LEFT       { return 20; }
                   4466: sub ANSWER_SUBMITTED { return 21; }
1.51      bowersj2 4467: 
                   4468: sub status {
                   4469:     my $self = shift;
                   4470:     my $part = shift;
                   4471:     if (!defined($part)) { $part = "0"; }
                   4472:     my $completionStatus = $self->getCompletionStatus($part);
                   4473:     my $dateStatus = $self->getDateStatus($part);
                   4474: 
                   4475:     # What we have is a two-dimensional matrix with 4 entries on one
                   4476:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 4477:     # plus network failure and "no date data at all".
1.51      bowersj2 4478: 
1.222     bowersj2 4479:     #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53      bowersj2 4480:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 4481: 
1.236     bowersj2 4482:     my $suppressFeedback = $self->problemstatus($part) eq 'no';
                   4483:     # If there's an answer date and we're past it, don't
                   4484:     # suppress the feedback; student should know
                   4485:     if ($self->answerdate($part) && $self->answerdate($part) < time()) {
                   4486: 	$suppressFeedback = 0;
                   4487:     }
1.185     bowersj2 4488: 
1.51      bowersj2 4489:     # There are a few whole rows we can dispose of:
1.53      bowersj2 4490:     if ($completionStatus == CORRECT ||
                   4491:         $completionStatus == CORRECT_BY_OVERRIDE ) {
1.185     bowersj2 4492:         return $suppressFeedback? ANSWER_SUBMITTED : CORRECT; 
1.69      bowersj2 4493:     }
                   4494: 
                   4495:     if ($completionStatus == ATTEMPTED) {
                   4496:         return ATTEMPTED;
1.53      bowersj2 4497:     }
                   4498: 
                   4499:     # If it's EXCUSED, then return that no matter what
                   4500:     if ($completionStatus == EXCUSED) {
                   4501:         return EXCUSED; 
1.51      bowersj2 4502:     }
                   4503: 
1.53      bowersj2 4504:     if ($dateStatus == NOTHING_SET) {
                   4505:         return NOTHING_SET;
1.51      bowersj2 4506:     }
                   4507: 
1.69      bowersj2 4508:     # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
                   4509:     # by 4 matrix (date statuses).
1.51      bowersj2 4510: 
1.54      bowersj2 4511:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59      bowersj2 4512:         $dateStatus == PAST_DUE_NO_ANSWER ) {
1.272     albertel 4513:         return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus; 
1.51      bowersj2 4514:     }
                   4515: 
1.53      bowersj2 4516:     if ($dateStatus == ANSWER_OPEN) {
                   4517:         return ANSWER_OPEN;
1.51      bowersj2 4518:     }
                   4519: 
                   4520:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   4521:     # (open_later), (open)
                   4522:     
1.53      bowersj2 4523:     if ($dateStatus == OPEN_LATER) {
                   4524:         return OPEN_LATER;
1.51      bowersj2 4525:     }
                   4526: 
                   4527:     # If it's WRONG...
1.53      bowersj2 4528:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 4529:         # and there are TRIES LEFT:
1.79      bowersj2 4530:         if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222     bowersj2 4531:             return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51      bowersj2 4532:         }
1.185     bowersj2 4533:         return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 4534:     }
                   4535: 
                   4536:     # Otherwise, it's untried and open
1.53      bowersj2 4537:     return OPEN; 
1.224     bowersj2 4538: }
                   4539: 
                   4540: sub CLOSED { return 23; }
                   4541: sub ERROR { return 24; }
                   4542: 
                   4543: =pod
                   4544: 
                   4545: B<Simple Status>
                   4546: 
                   4547: Convenience method B<simpleStatus> provides a "simple status" for the resource.
                   4548: "Simple status" corresponds to "which icon is shown on the
                   4549: Navmaps". There are six "simple" statuses:
                   4550: 
                   4551: =over 4
                   4552: 
                   4553: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
                   4554: 
                   4555: =item * B<OPEN>: The problem is open and unattempted.
                   4556: 
                   4557: =item * B<CORRECT>: The problem is correct for any reason.
                   4558: 
                   4559: =item * B<INCORRECT>: The problem is incorrect and can still be
                   4560: completed successfully.
                   4561: 
                   4562: =item * B<ATTEMPTED>: The problem has been attempted, but the student
                   4563: does not know if they are correct. (The ellipsis icon.)
                   4564: 
                   4565: =item * B<ERROR>: There is an error retrieving information about this
                   4566: problem.
                   4567: 
                   4568: =back
                   4569: 
                   4570: =cut
                   4571: 
                   4572: # This hash maps the composite status to this simple status, and
                   4573: # can be used directly, if you like
                   4574: my %compositeToSimple = 
                   4575:     (
                   4576:       NETWORK_FAILURE()       => ERROR,
                   4577:       NOTHING_SET()           => CLOSED,
                   4578:       CORRECT()               => CORRECT,
                   4579:       EXCUSED()               => CORRECT,
                   4580:       PAST_DUE_NO_ANSWER()    => INCORRECT,
                   4581:       PAST_DUE_ANSWER_LATER() => INCORRECT,
                   4582:       ANSWER_OPEN()           => INCORRECT,
                   4583:       OPEN_LATER()            => CLOSED,
                   4584:       TRIES_LEFT()            => OPEN,
                   4585:       INCORRECT()             => INCORRECT,
                   4586:       OPEN()                  => OPEN,
                   4587:       ATTEMPTED()             => ATTEMPTED,
                   4588:       ANSWER_SUBMITTED()      => ATTEMPTED
                   4589:      );
                   4590: 
                   4591: sub simpleStatus {
                   4592:     my $self = shift;
                   4593:     my $part = shift;
                   4594:     my $status = $self->status($part);
                   4595:     return $compositeToSimple{$status};
1.225     bowersj2 4596: }
                   4597: 
                   4598: =pod
                   4599: 
                   4600: B<simpleStatusCount> will return an array reference containing, in
                   4601: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
                   4602: and ERROR parts the given problem has.
                   4603: 
                   4604: =cut
                   4605:     
                   4606: # This maps the status to the slot we want to increment
                   4607: my %statusToSlotMap = 
                   4608:     (
                   4609:      OPEN()      => 0,
                   4610:      CLOSED()    => 1,
                   4611:      CORRECT()   => 2,
                   4612:      INCORRECT() => 3,
                   4613:      ATTEMPTED() => 4,
                   4614:      ERROR()     => 5
                   4615:      );
                   4616: 
                   4617: sub statusToSlot { return $statusToSlotMap{shift()}; }
                   4618: 
                   4619: sub simpleStatusCount {
                   4620:     my $self = shift;
                   4621: 
                   4622:     my @counts = (0, 0, 0, 0, 0, 0, 0);
                   4623:     foreach my $part (@{$self->parts()}) {
                   4624: 	$counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
                   4625:     }
                   4626: 
                   4627:     return \@counts;
1.191     bowersj2 4628: }
                   4629: 
                   4630: =pod
                   4631: 
                   4632: B<Completable>
                   4633: 
                   4634: The completable method represents the concept of I<whether the student can
                   4635: currently do the problem>. If the student can do the problem, which means
                   4636: that it is open, there are tries left, and if the problem is manually graded
                   4637: or the grade is suppressed via problemstatus, the student has not tried it
                   4638: yet, then the method returns 1. Otherwise, it returns 0, to indicate that 
                   4639: either the student has tried it and there is no feedback, or that for
                   4640: some reason it is no longer completable (not open yet, successfully completed,
                   4641: out of tries, etc.). As an example, this is used as the filter for the
                   4642: "Uncompleted Homework" option for the nav maps.
                   4643: 
                   4644: If this does not quite meet your needs, do not fiddle with it (unless you are
                   4645: fixing it to better match the student's conception of "completable" because
                   4646: it's broken somehow)... make a new method.
                   4647: 
                   4648: =cut
                   4649: 
                   4650: sub completable {
                   4651:     my $self = shift;
                   4652:     if (!$self->is_problem()) { return 0; }
                   4653:     my $partCount = $self->countParts();
                   4654: 
                   4655:     foreach my $part (@{$self->parts()}) {
                   4656:         if ($part eq '0' && $partCount != 1) { next; }
                   4657:         my $status = $self->status($part);
                   4658:         # "If any of the parts are open, or have tries left (implies open),
                   4659:         # and it is not "attempted" (manually graded problem), it is
                   4660:         # not "complete"
1.216     bowersj2 4661: 	if ($self->getCompletionStatus($part) == ATTEMPTED() ||
                   4662: 	    $status == ANSWER_SUBMITTED() ) {
                   4663: 	    # did this part already, as well as we can
                   4664: 	    next;
                   4665: 	}
                   4666: 	if ($status == OPEN() || $status == TRIES_LEFT()) {
                   4667: 	    return 1;
                   4668: 	}
1.191     bowersj2 4669:     }
                   4670:         
                   4671:     # If all the parts were complete, so was this problem.
1.216     bowersj2 4672:     return 0;
1.51      bowersj2 4673: }
                   4674: 
                   4675: =pod
                   4676: 
                   4677: =head2 Resource/Nav Map Navigation
                   4678: 
                   4679: =over 4
                   4680: 
1.174     albertel 4681: =item * B<getNext>():
                   4682: 
                   4683: Retreive an array of the possible next resources after this
                   4684: one. Always returns an array, even in the one- or zero-element case.
                   4685: 
                   4686: =item * B<getPrevious>():
1.85      bowersj2 4687: 
1.174     albertel 4688: Retreive an array of the possible previous resources from this
                   4689: one. Always returns an array, even in the one- or zero-element case.
1.51      bowersj2 4690: 
                   4691: =cut
                   4692: 
                   4693: sub getNext {
                   4694:     my $self = shift;
                   4695:     my @branches;
                   4696:     my $to = $self->to();
1.85      bowersj2 4697:     foreach my $branch ( split(/,/, $to) ) {
1.51      bowersj2 4698:         my $choice = $self->{NAV_MAP}->getById($branch);
1.301     albertel 4699:         if (!$choice->condition()) { next; }
1.51      bowersj2 4700:         my $next = $choice->goesto();
                   4701:         $next = $self->{NAV_MAP}->getById($next);
                   4702: 
1.131     bowersj2 4703:         push @branches, $next;
1.85      bowersj2 4704:     }
                   4705:     return \@branches;
                   4706: }
                   4707: 
                   4708: sub getPrevious {
                   4709:     my $self = shift;
                   4710:     my @branches;
                   4711:     my $from = $self->from();
                   4712:     foreach my $branch ( split /,/, $from) {
                   4713:         my $choice = $self->{NAV_MAP}->getById($branch);
                   4714:         my $prev = $choice->comesfrom();
                   4715:         $prev = $self->{NAV_MAP}->getById($prev);
                   4716: 
1.131     bowersj2 4717:         push @branches, $prev;
1.51      bowersj2 4718:     }
                   4719:     return \@branches;
1.131     bowersj2 4720: }
                   4721: 
                   4722: sub browsePriv {
                   4723:     my $self = shift;
                   4724:     if (defined($self->{BROWSE_PRIV})) {
                   4725:         return $self->{BROWSE_PRIV};
                   4726:     }
                   4727: 
1.311   ! albertel 4728:     $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
        !          4729: 						    $self->symb());
1.51      bowersj2 4730: }
                   4731: 
                   4732: =pod
1.2       www      4733: 
1.51      bowersj2 4734: =back
1.2       www      4735: 
1.51      bowersj2 4736: =cut
1.2       www      4737: 
1.51      bowersj2 4738: 1;
1.2       www      4739: 
1.51      bowersj2 4740: __END__
1.2       www      4741: 
                   4742: 

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