Annotation of loncom/interface/lonnavmaps.pm, revision 1.395

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.395   ! raeburn     4: # $Id: lonnavmaps.pm,v 1.394 2006/12/20 23:25:13 raeburn 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;
1.317     albertel   33: use GDBM_File;
1.18      albertel   34: use Apache::loncommon();
1.305     albertel   35: use Apache::lonenc();
1.229     www        36: use Apache::lonlocal;
1.306     foxr       37: use Apache::lonnet;
1.73      bowersj2   38: use POSIX qw (floor strftime);
1.300     albertel   39: use Data::Dumper; # for debugging, not always 
1.316     albertel   40: use Time::HiRes qw( gettimeofday tv_interval );
1.384     www        41: use lib '/home/httpd/lib/perl/';
                     42: use LONCAPA;
1.2       www        43: 
1.133     bowersj2   44: # symbolic constants
                     45: sub SYMB { return 1; }
                     46: sub URL { return 2; }
                     47: sub NOTHING { return 3; }
                     48: 
                     49: # Some data
                     50: 
1.140     bowersj2   51: my $resObj = "Apache::lonnavmaps::resource";
                     52: 
1.135     bowersj2   53: # Keep these mappings in sync with lonquickgrades, which uses the colors
                     54: # instead of the icons.
                     55: my %statusIconMap = 
1.224     bowersj2   56:     (
                     57:      $resObj->CLOSED       => '',
                     58:      $resObj->OPEN         => 'navmap.open.gif',
                     59:      $resObj->CORRECT      => 'navmap.correct.gif',
1.355     www        60:      $resObj->PARTIALLY_CORRECT      => 'navmap.partial.gif',
1.224     bowersj2   61:      $resObj->INCORRECT    => 'navmap.wrong.gif',
                     62:      $resObj->ATTEMPTED    => 'navmap.ellipsis.gif',
                     63:      $resObj->ERROR        => ''
                     64:      );
1.135     bowersj2   65: 
                     66: my %iconAltTags = 
                     67:     ( 'navmap.correct.gif' => 'Correct',
                     68:       'navmap.wrong.gif'   => 'Incorrect',
                     69:       'navmap.open.gif'    => 'Open' );
1.133     bowersj2   70: 
1.136     bowersj2   71: # Defines a status->color mapping, null string means don't color
                     72: my %colormap = 
1.140     bowersj2   73:     ( $resObj->NETWORK_FAILURE        => '',
                     74:       $resObj->CORRECT                => '',
                     75:       $resObj->EXCUSED                => '#3333FF',
                     76:       $resObj->PAST_DUE_ANSWER_LATER  => '',
                     77:       $resObj->PAST_DUE_NO_ANSWER     => '',
                     78:       $resObj->ANSWER_OPEN            => '#006600',
                     79:       $resObj->OPEN_LATER             => '',
                     80:       $resObj->TRIES_LEFT             => '',
                     81:       $resObj->INCORRECT              => '',
                     82:       $resObj->OPEN                   => '',
1.207     bowersj2   83:       $resObj->NOTHING_SET            => '',
                     84:       $resObj->ATTEMPTED              => '',
1.332     albertel   85:       $resObj->ANSWER_SUBMITTED       => '',
                     86:       $resObj->PARTIALLY_CORRECT      => '#006600'
1.207     bowersj2   87:       );
1.136     bowersj2   88: # And a special case in the nav map; what to do when the assignment
                     89: # is not yet done and due in less then 24 hours
                     90: my $hurryUpColor = "#FF0000";
1.130     www        91: 
1.269     albertel   92: sub close {
1.320     albertel   93:     if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
1.269     albertel   94:     return(<<ENDCLOSE);
                     95: <script type="text/javascript">
                     96: window.status='Accessing Nav Control';
                     97: menu=window.open("/adm/rat/empty.html","loncapanav",
                     98:                  "height=600,width=400,scrollbars=1");
                     99: window.status='Closing Nav Control';
                    100: menu.close();
                    101: window.status='Done.';
                    102: </script>
                    103: ENDCLOSE
                    104: }
1.268     albertel  105: 
1.270     albertel  106: sub update {
1.320     albertel  107:     if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
                    108:     if (!$env{'request.course.id'}) { return ''; }
1.270     albertel  109:     if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
                    110:     return(<<ENDUPDATE);
                    111: <form name="navform"></form>
                    112: <script type="text/javascript">
                    113: this.document.navform.action='/adm/navmaps#curloc';
                    114: this.document.navform.target='loncapanav';
                    115: this.document.navform.submit();
                    116: </script>
                    117: ENDUPDATE
                    118: }
1.268     albertel  119: 
1.51      bowersj2  120: # Convenience functions: Returns a string that adds or subtracts
                    121: # the second argument from the first hash, appropriate for the 
                    122: # query string that determines which folders to recurse on
                    123: sub addToFilter {
                    124:     my $hashIn = shift;
                    125:     my $addition = shift;
                    126:     my %hash = %$hashIn;
                    127:     $hash{$addition} = 1;
                    128: 
                    129:     return join (",", keys(%hash));
                    130: }
                    131: 
                    132: sub removeFromFilter {
                    133:     my $hashIn = shift;
                    134:     my $subtraction = shift;
                    135:     my %hash = %$hashIn;
                    136: 
                    137:     delete $hash{$subtraction};
                    138:     return join(",", keys(%hash));
                    139: }
                    140: 
                    141: # Convenience function: Given a stack returned from getStack on the iterator,
                    142: # return the correct src() value.
                    143: sub getLinkForResource {
                    144:     my $stack = shift;
                    145:     my $res;
                    146: 
                    147:     # Check to see if there are any pages in the stack
                    148:     foreach $res (@$stack) {
1.248     www       149:         if (defined($res)) {
1.308     albertel  150: 	    my $anchor;
1.248     www       151: 	    if ($res->is_page()) {
1.394     raeburn   152: 		foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; }  }
1.384     www       153: 		$anchor=&escape($anchor->shown_symb());
1.308     albertel  154: 		return ($res->link(),$res->shown_symb(),$anchor);
1.248     www       155: 	    }
                    156:             # in case folder was skipped over as "only sequence"
                    157: 	    my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
                    158: 	    if ($map=~/\.page$/) {
1.308     albertel  159: 		my $url=&Apache::lonnet::clutter($map);
1.384     www       160: 		$anchor=&escape($src->shown_symb());
1.308     albertel  161: 		return ($url,$res->shown_symb(),$anchor);
1.248     www       162: 	    }
1.51      bowersj2  163:         }
                    164:     }
                    165: 
                    166:     # Failing that, return the src of the last resource that is defined
                    167:     # (when we first recurse on a map, it puts an undefined resource
                    168:     # on the bottom because $self->{HERE} isn't defined yet, and we
                    169:     # want the src for the map anyhow)
1.394     raeburn   170:     foreach my $item (@$stack) {
                    171:         if (defined($item)) { $res = $item; }
1.51      bowersj2  172:     }
                    173: 
1.308     albertel  174:     return ($res->link(),$res->shown_symb());
1.51      bowersj2  175: }
                    176: 
1.251     www       177: # Convenience function: This separates the logic of how to create
1.53      bowersj2  178: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
1.251     www       179: # etc.) into a separate function. It takes a resource object as the
1.53      bowersj2  180: # first parameter, and the part number of the resource as the second.
                    181: # It's basically a big switch statement on the status of the resource.
                    182: 
                    183: sub getDescription {
                    184:     my $res = shift;
                    185:     my $part = shift;
1.69      bowersj2  186:     my $status = $res->status($part);
1.53      bowersj2  187: 
1.182     bowersj2  188:     if ($status == $res->NETWORK_FAILURE) { 
1.229     www       189:         return &mt("Having technical difficulties; please check status later"); 
1.182     bowersj2  190:     }
1.53      bowersj2  191:     if ($status == $res->NOTHING_SET) {
1.229     www       192:         return &mt("Not currently assigned.");
1.53      bowersj2  193:     }
                    194:     if ($status == $res->OPEN_LATER) {
1.341     albertel  195:         return "Open " . timeToHumanString($res->opendate($part),'start');
1.53      bowersj2  196:     }
                    197:     if ($status == $res->OPEN) {
1.79      bowersj2  198:         if ($res->duedate($part)) {
1.341     albertel  199:             return &mt("Due")."  " .timeToHumanString($res->duedate($part),'end');
1.66      bowersj2  200:         } else {
1.229     www       201:             return &mt("Open, no due date");
1.66      bowersj2  202:         }
1.53      bowersj2  203:     }
1.54      bowersj2  204:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.341     albertel  205:         return &mt("Answer open")." " . timeToHumanString($res->answerdate($part),'start');
1.54      bowersj2  206:     }
                    207:     if ($status == $res->PAST_DUE_NO_ANSWER) {
1.341     albertel  208:         return &mt("Was due")." " . timeToHumanString($res->duedate($part),'end');
1.53      bowersj2  209:     }
1.357     albertel  210:     if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
                    211: 	&& $res->handgrade($part) ne 'yes') {
1.229     www       212:         return &mt("Answer available");
1.53      bowersj2  213:     }
1.59      bowersj2  214:     if ($status == $res->EXCUSED) {
1.229     www       215:         return &mt("Excused by instructor");
1.59      bowersj2  216:     }
1.69      bowersj2  217:     if ($status == $res->ATTEMPTED) {
1.229     www       218:         return &mt("Answer submitted, not yet graded");
1.69      bowersj2  219:     }
1.59      bowersj2  220:     if ($status == $res->TRIES_LEFT) {
1.79      bowersj2  221:         my $tries = $res->tries($part);
                    222:         my $maxtries = $res->maxtries($part);
                    223:         my $triesString = "";
                    224:         if ($tries && $maxtries) {
                    225:             $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
                    226:             if ($maxtries > 1 && $maxtries - $tries == 1) {
                    227:                 $triesString = "<b>$triesString</b>";
                    228:             }
                    229:         }
1.244     albertel  230:         if ($res->duedate($part)) {
1.341     albertel  231:             return &mt("Due")." " . timeToHumanString($res->duedate($part),'end') .
1.66      bowersj2  232:                 " $triesString";
                    233:         } else {
1.229     www       234:             return &mt("No due date")." $triesString";
1.66      bowersj2  235:         }
1.59      bowersj2  236:     }
1.185     bowersj2  237:     if ($status == $res->ANSWER_SUBMITTED) {
1.229     www       238:         return &mt('Answer submitted');
1.185     bowersj2  239:     }
1.53      bowersj2  240: }
                    241: 
1.115     bowersj2  242: # Convenience function, so others can use it: Is the problem due in less then
                    243: # 24 hours, and still can be done?
                    244: 
1.252     matthew   245: sub dueInLessThan24Hours {
1.115     bowersj2  246:     my $res = shift;
                    247:     my $part = shift;
                    248:     my $status = $res->status($part);
                    249: 
1.207     bowersj2  250:     return ($status == $res->OPEN() ||
1.115     bowersj2  251:             $status == $res->TRIES_LEFT()) &&
1.244     albertel  252: 	    $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
                    253: 	    $res->duedate($part) > time();
1.115     bowersj2  254: }
                    255: 
                    256: # Convenience function, so others can use it: Is there only one try remaining for the
                    257: # part, with more then one try to begin with, not due yet and still can be done?
                    258: sub lastTry {
                    259:     my $res = shift;
                    260:     my $part = shift;
                    261: 
                    262:     my $tries = $res->tries($part);
                    263:     my $maxtries = $res->maxtries($part);
                    264:     return $tries && $maxtries && $maxtries > 1 &&
1.244     albertel  265:         $maxtries - $tries == 1 && $res->duedate($part) &&
                    266:         $res->duedate($part) > time();
1.115     bowersj2  267: }
                    268: 
1.320     albertel  269: # This puts a human-readable name on the env variable.
1.177     www       270: 
1.68      bowersj2  271: sub advancedUser {
1.320     albertel  272:     return $env{'request.role.adv'};
1.68      bowersj2  273: }
                    274: 
1.73      bowersj2  275: 
                    276: # timeToHumanString takes a time number and converts it to a
                    277: # human-readable representation, meant to be used in the following
                    278: # manner:
                    279: # print "Due $timestring"
                    280: # print "Open $timestring"
                    281: # print "Answer available $timestring"
                    282: # Very, very, very, VERY English-only... goodness help a localizer on
                    283: # this func...
1.347     www       284: 
                    285: 
1.53      bowersj2  286: sub timeToHumanString {
1.346     foxr      287:     my ($time,$type,$format) = @_;
                    288: 
1.58      albertel  289:     # zero, '0' and blank are bad times
1.73      bowersj2  290:     if (!$time) {
1.229     www       291:         return &mt('never');
1.73      bowersj2  292:     }
1.231     www       293:     unless (&Apache::lonlocal::current_language()=~/^en/) {
1.237     www       294: 	return &Apache::lonlocal::locallocaltime($time);
1.229     www       295:     } 
1.73      bowersj2  296:     my $now = time();
                    297: 
                    298:     my @time = localtime($time);
                    299:     my @now = localtime($now);
                    300: 
                    301:     # Positive = future
                    302:     my $delta = $time - $now;
                    303: 
                    304:     my $minute = 60;
                    305:     my $hour = 60 * $minute;
                    306:     my $day = 24 * $hour;
                    307:     my $week = 7 * $day;
                    308:     my $inPast = 0;
                    309: 
                    310:     # Logic in comments:
                    311:     # Is it now? (extremely unlikely)
                    312:     if ( $delta == 0 ) {
                    313:         return "this instant";
                    314:     }
                    315: 
                    316:     if ($delta < 0) {
                    317:         $inPast = 1;
                    318:         $delta = -$delta;
                    319:     }
                    320: 
                    321:     if ( $delta > 0 ) {
1.101     bowersj2  322: 
1.73      bowersj2  323:         my $tense = $inPast ? " ago" : "";
                    324:         my $prefix = $inPast ? "" : "in ";
1.101     bowersj2  325:         
                    326:         # Less then a minute
1.73      bowersj2  327:         if ( $delta < $minute ) {
                    328:             if ($delta == 1) { return "${prefix}1 second$tense"; }
                    329:             return "$prefix$delta seconds$tense";
                    330:         }
                    331: 
1.101     bowersj2  332:         # Less then an hour
1.73      bowersj2  333:         if ( $delta < $hour ) {
                    334:             # If so, use minutes
                    335:             my $minutes = floor($delta / 60);
                    336:             if ($minutes == 1) { return "${prefix}1 minute$tense"; }
                    337:             return "$prefix$minutes minutes$tense";
                    338:         }
                    339:         
                    340:         # Is it less then 24 hours away? If so,
                    341:         # display hours + minutes
                    342:         if ( $delta < $hour * 24) {
                    343:             my $hours = floor($delta / $hour);
                    344:             my $minutes = floor(($delta % $hour) / $minute);
                    345:             my $hourString = "$hours hours";
                    346:             my $minuteString = ", $minutes minutes";
                    347:             if ($hours == 1) {
                    348:                 $hourString = "1 hour";
                    349:             }
                    350:             if ($minutes == 1) {
                    351:                 $minuteString = ", 1 minute";
                    352:             }
                    353:             if ($minutes == 0) {
                    354:                 $minuteString = "";
                    355:             }
                    356:             return "$prefix$hourString$minuteString$tense";
                    357:         }
                    358: 
1.346     foxr      359: 	# If there's a caller supplied format, use it.
                    360: 
                    361: 	if($format ne '') {
                    362: 	    my $timeStr = strftime($format, localtime($time));
1.378     albertel  363: 	    return $timeStr.&Apache::lonlocal::gettimezone($time);
1.346     foxr      364: 	}
                    365: 
1.73      bowersj2  366:         # Less then 5 days away, display day of the week and
                    367:         # HH:MM
1.346     foxr      368: 
1.73      bowersj2  369:         if ( $delta < $day * 5 ) {
1.85      bowersj2  370:             my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.238     albertel  371:             $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  372:             $timeStr =~ s/12:00 pm/noon/;
1.333     albertel  373:             return ($inPast ? "last " : "this ") .
1.378     albertel  374:                 $timeStr.&Apache::lonlocal::gettimezone($time);
1.73      bowersj2  375:         }
                    376:         
1.341     albertel  377: 	my $conjunction='on';
                    378: 	if ($type eq 'start') {
                    379: 	    $conjunction='at';
                    380: 	} elsif ($type eq 'end') {
                    381: 	    $conjunction='by';
                    382: 	}
1.73      bowersj2  383:         # Is it this year?
                    384:         if ( $time[5] == $now[5]) {
                    385:             # Return on Month Day, HH:MM meridian
1.341     albertel  386:             my $timeStr = strftime("$conjunction %A, %b %e at %I:%M %P", localtime($time));
1.238     albertel  387:             $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  388:             $timeStr =~ s/12:00 pm/noon/;
1.378     albertel  389:             return $timeStr.&Apache::lonlocal::gettimezone($time);
1.73      bowersj2  390:         }
                    391: 
                    392:         # Not this year, so show the year
1.341     albertel  393:         my $timeStr = strftime("$conjunction %A, %b %e %Y at %I:%M %P", localtime($time));
1.238     albertel  394:         $timeStr =~ s/12:00 am/00:00/;
1.73      bowersj2  395:         $timeStr =~ s/12:00 pm/noon/;
1.378     albertel  396:         return $timeStr.&Apache::lonlocal::gettimezone($time);
1.58      albertel  397:     }
1.53      bowersj2  398: }
                    399: 
1.51      bowersj2  400: 
1.133     bowersj2  401: =pod
                    402: 
1.174     albertel  403: =head1 NAME
                    404: 
1.217     bowersj2  405: Apache::lonnavmap - Subroutines to handle and render the navigation
                    406:     maps
1.174     albertel  407: 
                    408: =head1 SYNOPSIS
                    409: 
                    410: The main handler generates the navigational listing for the course,
                    411: the other objects export this information in a usable fashion for
1.205     bowersj2  412: other modules.
1.133     bowersj2  413: 
1.216     bowersj2  414: =head1 OVERVIEW
                    415: 
1.217     bowersj2  416: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.218     bowersj2  417: course structure and caches it in what is often referred to as the
                    418: "big hash" X<big hash>. You can see it if you are logged into
                    419: LON-CAPA, in a course, by going to /adm/test. (You may need to
                    420: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
                    421: content of the hash will be under the heading "Big Hash".
1.216     bowersj2  422: 
                    423: Big Hash contains, among other things, how resources are related
                    424: to each other (next/previous), what resources are maps, which 
                    425: resources are being chosen to not show to the student (for random
                    426: selection), and a lot of other things that can take a lot of time
                    427: to compute due to the amount of data that needs to be collected and
                    428: processed.
                    429: 
                    430: Apache::lonnavmaps provides an object model for manipulating this
                    431: information in a higher-level fashion then directly manipulating 
                    432: the hash. It also provides access to several auxilary functions 
                    433: that aren't necessarily stored in the Big Hash, but are a per-
                    434: resource sort of value, like whether there is any feedback on 
                    435: a given resource.
                    436: 
                    437: Apache::lonnavmaps also abstracts away branching, and someday, 
                    438: conditions, for the times where you don't really care about those
                    439: things.
                    440: 
                    441: Apache::lonnavmaps also provides fairly powerful routines for
                    442: rendering navmaps, and last but not least, provides the navmaps
                    443: view for when the user clicks the NAV button.
                    444: 
                    445: B<Note>: Apache::lonnavmaps I<only> works for the "currently
                    446: logged in user"; if you want things like "due dates for another
                    447: student" lonnavmaps can not directly retrieve information like
                    448: that. You need the EXT function. This module can still help,
                    449: because many things, such as the course structure, are constant
                    450: between users, and Apache::lonnavmaps can help by providing
                    451: symbs for the EXT call.
                    452: 
                    453: The rest of this file will cover the provided rendering routines, 
                    454: which can often be used without fiddling with the navmap object at
                    455: all, then documents the Apache::lonnavmaps::navmap object, which
                    456: is the key to accessing the Big Hash information, covers the use
                    457: of the Iterator (which provides the logic for traversing the 
                    458: somewhat-complicated Big Hash data structure), documents the
                    459: Apache::lonnavmaps::Resource objects that are returned by 
                    460: 
1.205     bowersj2  461: =head1 Subroutine: render
1.133     bowersj2  462: 
1.174     albertel  463: The navmap renderer package provides a sophisticated rendering of the
                    464: standard navigation maps interface into HTML. The provided nav map
                    465: handler is actually just a glorified call to this.
1.133     bowersj2  466: 
1.216     bowersj2  467: Because of the large number of parameters this function accepts,
1.174     albertel  468: instead of passing it arguments as is normal, pass it in an anonymous
1.216     bowersj2  469: hash with the desired options.
1.174     albertel  470: 
                    471: The package provides a function called 'render', called as
1.205     bowersj2  472: Apache::lonnavmaps::render({}).
1.51      bowersj2  473: 
1.133     bowersj2  474: =head2 Overview of Columns
1.51      bowersj2  475: 
1.174     albertel  476: The renderer will build an HTML table for the navmap and return
                    477: it. The table is consists of several columns, and a row for each
                    478: resource (or possibly each part). You tell the renderer how many
                    479: columns to create and what to place in each column, optionally using
1.205     bowersj2  480: one or more of the prepared columns, and the renderer will assemble
1.174     albertel  481: the table.
                    482: 
                    483: Any additional generally useful column types should be placed in the
                    484: renderer code here, so anybody can use it anywhere else. Any code
                    485: specific to the current application (such as the addition of <input>
                    486: elements in a column) should be placed in the code of the thing using
                    487: the renderer.
                    488: 
                    489: At the core of the renderer is the array reference COLS (see Example
                    490: section below for how to pass this correctly). The COLS array will
                    491: consist of entries of one of two types of things: Either an integer
                    492: representing one of the pre-packaged column types, or a sub reference
                    493: that takes a resource reference, a part number, and a reference to the
                    494: argument hash passed to the renderer, and returns a string that will
                    495: be inserted into the HTML representation as it.
                    496: 
1.216     bowersj2  497: All other parameters are ways of either changing how the columns
                    498: are printing, or which rows are shown.
                    499: 
1.174     albertel  500: The pre-packaged column names are refered to by constants in the
1.205     bowersj2  501: Apache::lonnavmaps namespace. The following currently exist:
1.51      bowersj2  502: 
1.174     albertel  503: =over 4
1.51      bowersj2  504: 
1.216     bowersj2  505: =item * B<Apache::lonnavmaps::resource>:
1.51      bowersj2  506: 
1.174     albertel  507: The general info about the resource: Link, icon for the type, etc. The
1.216     bowersj2  508: first column in the standard nav map display. This column provides the
                    509: indentation effect seen in the B<NAV> screen. This column also accepts
1.205     bowersj2  510: the following parameters in the renderer hash:
1.51      bowersj2  511: 
1.133     bowersj2  512: =over 4
1.51      bowersj2  513: 
1.216     bowersj2  514: =item * B<resource_nolink>: default false
1.51      bowersj2  515: 
1.216     bowersj2  516: If true, the resource will not be linked. By default, all non-folder
                    517: resources are linked.
1.174     albertel  518: 
1.216     bowersj2  519: =item * B<resource_part_count>: default true
1.51      bowersj2  520: 
1.216     bowersj2  521: If true, the resource will show a part count B<if> the full
                    522: part list is not displayed. (See "condense_parts" later.) If false,
                    523: the resource will never show a part count.
1.133     bowersj2  524: 
1.174     albertel  525: =item * B<resource_no_folder_link>:
1.133     bowersj2  526: 
1.174     albertel  527: If true, the resource's folder will not be clickable to open or close
                    528: it. Default is false. True implies printCloseAll is false, since you
                    529: can't close or open folders when this is on anyhow.
1.144     bowersj2  530: 
1.133     bowersj2  531: =back
1.51      bowersj2  532: 
1.225     bowersj2  533: =item * B<Apache::lonnavmaps::communication_status>:
1.174     albertel  534: 
                    535: Whether there is discussion on the resource, email for the user, or
                    536: (lumped in here) perl errors in the execution of the problem. This is
                    537: the second column in the main nav map.
                    538: 
1.225     bowersj2  539: =item * B<Apache::lonnavmaps::quick_status>:
1.51      bowersj2  540: 
1.216     bowersj2  541: An icon for the status of a problem, with five possible states:
                    542: Correct, incorrect, open, awaiting grading (for a problem where the
                    543: computer's grade is suppressed, or the computer can't grade, like
                    544: essay problem), or none (not open yet, not a problem). The
1.174     albertel  545: third column of the standard navmap.
1.51      bowersj2  546: 
1.225     bowersj2  547: =item * B<Apache::lonnavmaps::long_status>:
1.174     albertel  548: 
                    549: A text readout of the details of the current status of the problem,
                    550: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51      bowersj2  551: 
1.225     bowersj2  552: =item * B<Apache::lonnavmaps::part_status_summary>:
                    553: 
                    554: A text readout summarizing the status of the problem. If it is a
                    555: single part problem, will display "Correct", "Incorrect", 
                    556: "Not yet open", "Open", "Attempted", or "Error". If there are
                    557: multiple parts, this will output a string that in HTML will show a
                    558: status of how many parts are in each status, in color coding, trying
                    559: to match the colors of the icons within reason.
                    560: 
                    561: Note this only makes sense if you are I<not> showing parts. If 
                    562: C<showParts> is true (see below), this column will not output
                    563: anything. 
                    564: 
1.133     bowersj2  565: =back
1.51      bowersj2  566: 
1.133     bowersj2  567: If you add any others please be sure to document them here.
1.51      bowersj2  568: 
1.174     albertel  569: An example of a column renderer that will show the ID number of a
                    570: resource, along with the part name if any:
1.51      bowersj2  571: 
1.133     bowersj2  572:  sub { 
                    573:   my ($resource, $part, $params) = @_;   
                    574:   if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
                    575:   return '<td>' . $resource->{ID} . '</td>';
                    576:  }
1.51      bowersj2  577: 
1.174     albertel  578: Note these functions are responsible for the TD tags, which allow them
                    579: to override vertical and horizontal alignment, etc.
1.130     www       580: 
1.133     bowersj2  581: =head2 Parameters
1.115     bowersj2  582: 
1.217     bowersj2  583: Minimally, you should be
1.174     albertel  584: able to get away with just using 'cols' (to specify the columns
                    585: shown), 'url' (necessary for the folders to link to the current screen
                    586: correctly), and possibly 'queryString' if your app calls for it. In
                    587: that case, maintaining the state of the folders will be done
                    588: automatically.
1.140     bowersj2  589: 
1.133     bowersj2  590: =over 4
1.51      bowersj2  591: 
1.320     albertel  592: =item * B<iterator>: default: constructs one from %env
1.174     albertel  593: 
                    594: A reference to a fresh ::iterator to use from the navmaps. The
                    595: rendering will reflect the options passed to the iterator, so you can
                    596: use that to just render a certain part of the course, if you like. If
                    597: one is not passed, the renderer will attempt to construct one from
1.320     albertel  598: env{'form.filter'} and env{'form.condition'} information, plus the
1.174     albertel  599: 'iterator_map' parameter if any.
                    600: 
1.216     bowersj2  601: =item * B<iterator_map>: default: not used
1.174     albertel  602: 
                    603: If you are letting the renderer do the iterator handling, you can
                    604: instruct the renderer to render only a particular map by passing it
                    605: the source of the map you want to process, like
                    606: '/res/103/jerf/navmap.course.sequence'.
                    607: 
1.320     albertel  608: =item * B<navmap>: default: constructs one from %env
1.174     albertel  609: 
                    610: A reference to a navmap, used only if an iterator is not passed in. If
                    611: this is necessary to make an iterator but it is not passed in, a new
1.320     albertel  612: one will be constructed based on env info. This is useful to do basic
1.174     albertel  613: error checking before passing it off to render.
                    614: 
1.216     bowersj2  615: =item * B<r>: default: must be passed in
1.174     albertel  616: 
                    617: The standard Apache response object. This must be passed to the
                    618: renderer or the course hash will be locked.
                    619: 
1.216     bowersj2  620: =item * B<cols>: default: empty (useless)
1.174     albertel  621: 
                    622: An array reference
                    623: 
1.216     bowersj2  624: =item * B<showParts>:default true
1.174     albertel  625: 
1.216     bowersj2  626: A flag. If true, a line for the resource itself, and a line
1.174     albertel  627: for each part will be displayed. If not, only one line for each
                    628: resource will be displayed.
                    629: 
1.216     bowersj2  630: =item * B<condenseParts>: default true
1.174     albertel  631: 
1.216     bowersj2  632: A flag. If true, if all parts of the problem have the same
1.174     albertel  633: status and that status is Nothing Set, Correct, or Network Failure,
                    634: then only one line will be displayed for that resource anyhow. If no,
                    635: all parts will always be displayed. If showParts is 0, this is
                    636: ignored.
                    637: 
1.320     albertel  638: =item * B<jumpCount>: default: determined from %env
1.174     albertel  639: 
1.216     bowersj2  640: A string identifying the URL to place the anchor 'curloc' at.
                    641: It is the responsibility of the renderer user to
1.174     albertel  642: ensure that the #curloc is in the URL. By default, determined through
1.320     albertel  643: the use of the env{} 'jump' information, and should normally "just
1.174     albertel  644: work" correctly.
1.144     bowersj2  645: 
1.216     bowersj2  646: =item * B<here>: default: empty string
1.140     bowersj2  647: 
1.216     bowersj2  648: A Symb identifying where to place the 'here' marker. The empty
                    649: string means no marker.
1.92      bowersj2  650: 
1.216     bowersj2  651: =item * B<indentString>: default: 25 pixel whitespace image
1.164     bowersj2  652: 
1.216     bowersj2  653: A string identifying the indentation string to use. 
1.92      bowersj2  654: 
1.216     bowersj2  655: =item * B<queryString>: default: empty
1.51      bowersj2  656: 
1.174     albertel  657: A string which will be prepended to the query string used when the
1.216     bowersj2  658: folders are opened or closed. You can use this to pass
                    659: application-specific values.
1.55      bowersj2  660: 
1.216     bowersj2  661: =item * B<url>: default: none
1.84      bowersj2  662: 
1.174     albertel  663: The url the folders will link to, which should be the current
1.216     bowersj2  664: page. Required if the resource info column is shown, and you 
                    665: are allowing the user to open and close folders.
1.115     bowersj2  666: 
1.216     bowersj2  667: =item * B<currentJumpIndex>: default: no jumping
1.55      bowersj2  668: 
1.174     albertel  669: Describes the currently-open row number to cause the browser to jump
                    670: to, because the user just opened that folder. By default, pulled from
1.320     albertel  671: the Jump information in the env{'form.*'}.
1.51      bowersj2  672: 
1.216     bowersj2  673: =item * B<printKey>: default: false
1.51      bowersj2  674: 
1.174     albertel  675: If true, print the key that appears on the top of the standard
1.216     bowersj2  676: navmaps.
1.139     bowersj2  677: 
1.216     bowersj2  678: =item * B<printCloseAll>: default: true
1.140     bowersj2  679: 
1.174     albertel  680: If true, print the "Close all folders" or "open all folders"
1.216     bowersj2  681: links.
1.140     bowersj2  682: 
1.216     bowersj2  683: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.153     bowersj2  684: 
1.174     albertel  685: A function that takes the resource object as its only parameter and
                    686: returns a true or false value. If true, the resource is displayed. If
1.216     bowersj2  687: false, it is simply skipped in the display.
1.174     albertel  688: 
1.216     bowersj2  689: =item * B<suppressEmptySequences>: default: false
1.190     bowersj2  690: 
                    691: If you're using a filter function, and displaying sequences to orient
                    692: the user, then frequently some sequences will be empty. Setting this to
                    693: true will cause those sequences not to display, so as not to confuse the
                    694: user into thinking that if the sequence is there there should be things
1.216     bowersj2  695: under it; for example, see the "Show Uncompleted Homework" view on the
                    696: B<NAV> screen.
1.190     bowersj2  697: 
1.216     bowersj2  698: =item * B<suppressNavmaps>: default: false
1.174     albertel  699: 
1.216     bowersj2  700: If true, will not display Navigate Content resources. 
1.143     bowersj2  701: 
1.133     bowersj2  702: =back
1.51      bowersj2  703: 
1.133     bowersj2  704: =head2 Additional Info
1.51      bowersj2  705: 
1.174     albertel  706: In addition to the parameters you can pass to the renderer, which will
                    707: be passed through unchange to the column renderers, the renderer will
                    708: generate the following information which your renderer may find
                    709: useful:
                    710: 
1.216     bowersj2  711: =over 4
                    712: 
                    713: =item * B<counter>: 
1.145     bowersj2  714: 
1.216     bowersj2  715: Contains the number of rows printed. Useful after calling the render 
                    716: function, as you can detect whether anything was printed at all.
                    717: 
                    718: =item * B<isNewBranch>:
                    719: 
                    720: Useful for renderers: If this resource is currently the first resource
                    721: of a new branch, this will be true. The Resource column (leftmost in the
                    722: navmaps screen) uses this to display the "new branch" icon 
1.59      bowersj2  723: 
1.133     bowersj2  724: =back
1.59      bowersj2  725: 
1.133     bowersj2  726: =cut
1.59      bowersj2  727: 
1.133     bowersj2  728: sub resource { return 0; }
                    729: sub communication_status { return 1; }
                    730: sub quick_status { return 2; }
                    731: sub long_status { return 3; }
1.225     bowersj2  732: sub part_status_summary { return 4; }
1.51      bowersj2  733: 
1.133     bowersj2  734: sub render_resource {
                    735:     my ($resource, $part, $params) = @_;
1.51      bowersj2  736: 
1.133     bowersj2  737:     my $nonLinkedText = ''; # stuff after resource title not in link
1.51      bowersj2  738: 
1.134     bowersj2  739:     my $link = $params->{"resourceLink"};
1.306     foxr      740: 
                    741:     #  The URL part is not escaped at this point, but the symb is... 
                    742:     #  The stuff to the left of the ? must have ' replaced by \' since
                    743:     #  it will be quoted with ' in the href.
                    744: 
                    745:     my ($left,$right) = split(/\?/, $link);
                    746:     $link = $left.'?'.$right;
                    747: 
1.134     bowersj2  748:     my $src = $resource->src();
                    749:     my $it = $params->{"iterator"};
1.133     bowersj2  750:     my $filter = $it->{FILTER};
                    751: 
                    752:     my $title = $resource->compTitle();
1.258     albertel  753: 
1.133     bowersj2  754:     my $partLabel = "";
                    755:     my $newBranchText = "";
1.298     albertel  756:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1.133     bowersj2  757:     # If this is a new branch, label it so
                    758:     if ($params->{'isNewBranch'}) {
1.329     albertel  759:         $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
1.51      bowersj2  760:     }
                    761: 
1.133     bowersj2  762:     # links to open and close the folder
1.306     foxr      763: 
                    764:     
1.349     foxr      765:     my $linkopen = "<a href=\"$link\">";
1.306     foxr      766: 
                    767: 
1.133     bowersj2  768:     my $linkclose = "</a>";
1.51      bowersj2  769: 
1.204     albertel  770:     # Default icon: unknown page
1.329     albertel  771:     my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt='&nbsp;&nbsp;' ' />";
1.133     bowersj2  772:     
                    773:     if ($resource->is_problem()) {
1.192     bowersj2  774:         if ($part eq '0' || $params->{'condensed'}) {
1.389     albertel  775: 	    $icon = '<img src="'.$location.'/';
                    776: 	    if ($resource->is_task()) {
                    777: 		$icon .= 'task.gif" alt="'.&mt('Task');
                    778: 	    } else {
                    779: 		$icon .= 'problem.gif" alt="'.&mt('Problem');
                    780: 	    }
                    781: 	    $icon .='" border="0" />';
1.133     bowersj2  782:         } else {
                    783:             $icon = $params->{'indentString'};
                    784:         }
1.204     albertel  785:     } else {
1.329     albertel  786: 	$icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt='&nbsp;&nbsp;' border='0' />";
1.133     bowersj2  787:     }
1.51      bowersj2  788: 
1.133     bowersj2  789:     # Display the correct map icon to open or shut map
                    790:     if ($resource->is_map()) {
                    791:         my $mapId = $resource->map_pc();
                    792:         my $nowOpen = !defined($filter->{$mapId});
                    793:         if ($it->{CONDITION}) {
                    794:             $nowOpen = !$nowOpen;
                    795:         }
1.144     bowersj2  796: 
1.205     bowersj2  797: 	my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1.362     www       798:         my $title=$resource->title;
1.363     albertel  799:         $title=~s/\"/\&quot;/g;
1.144     bowersj2  800:         if (!$params->{'resource_no_folder_link'}) {
1.205     bowersj2  801:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.363     albertel  802: 	    $icon = "<img src='$location/$icon' alt=\"".
                    803: 		($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" border='0' />";
1.144     bowersj2  804: 
1.349     foxr      805:             $linkopen = "<a href=\"" . $params->{'url'} . '?' . 
1.392     albertel  806:                 $params->{'queryString'} . '&amp;filter=';
1.144     bowersj2  807:             $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
                    808:                 addToFilter($filter, $mapId) :
                    809:                 removeFromFilter($filter, $mapId);
1.392     albertel  810:             $linkopen .= "&amp;condition=" . $it->{CONDITION} . '&amp;hereType='
                    811:                 . $params->{'hereType'} . '&amp;here=' .
1.384     www       812:                 &escape($params->{'here'}) . 
1.392     albertel  813:                 '&amp;jump=' .
1.384     www       814:                 &escape($resource->symb()) . 
1.392     albertel  815:                 "&amp;folderManip=1\">";
1.306     foxr      816: 
1.144     bowersj2  817:         } else {
                    818:             # Don't allow users to manipulate folder
1.205     bowersj2  819:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1.144     bowersj2  820:                 '.nomanip.gif';
1.364     www       821:             $icon = "<img src='$location/$icon' alt=\"".
                    822: 		($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" border='0' />";
1.144     bowersj2  823: 
                    824:             $linkopen = "";
                    825:             $linkclose = "";
                    826:         }
1.133     bowersj2  827:     }
1.51      bowersj2  828: 
1.133     bowersj2  829:     if ($resource->randomout()) {
1.362     www       830:         $nonLinkedText .= ' <i>('.&mt('hidden').')</i> ';
1.133     bowersj2  831:     }
1.342     albertel  832:     if (!$resource->condval()) {
1.362     www       833:         $nonLinkedText .= ' <i>('.&mt('conditionally hidden').')</i> ';
1.342     albertel  834:     }
1.133     bowersj2  835:     
                    836:     # We're done preparing and finally ready to start the rendering
1.392     albertel  837:     my $result = "<td align='left' valign='middle'>";
1.140     bowersj2  838: 
                    839:     my $indentLevel = $params->{'indentLevel'};
                    840:     if ($newBranchText) { $indentLevel--; }
                    841: 
1.133     bowersj2  842:     # print indentation
1.140     bowersj2  843:     for (my $i = 0; $i < $indentLevel; $i++) {
1.133     bowersj2  844:         $result .= $params->{'indentString'};
1.84      bowersj2  845:     }
                    846: 
1.133     bowersj2  847:     # Decide what to display
1.306     foxr      848: 
1.133     bowersj2  849:     $result .= "$newBranchText$linkopen$icon$linkclose";
                    850:     
                    851:     my $curMarkerBegin = '';
                    852:     my $curMarkerEnd = '';
1.51      bowersj2  853: 
1.133     bowersj2  854:     # Is this the current resource?
1.158     bowersj2  855:     if (!$params->{'displayedHereMarker'} && 
                    856:         $resource->symb() eq $params->{'here'} ) {
1.345     www       857:         $curMarkerBegin = '<font color="red" size="+2">&gt;</font>';
1.133     bowersj2  858:         $curMarkerEnd = '<font color="red" size="+2">&lt;</font>';
1.158     bowersj2  859:         $params->{'displayedHereMarker'} = 1;
1.51      bowersj2  860:     }
                    861: 
1.192     bowersj2  862:     if ($resource->is_problem() && $part ne '0' && 
1.133     bowersj2  863:         !$params->{'condensed'}) {
1.274     matthew   864: 	my $displaypart=$resource->part_display($part);
1.363     albertel  865:         $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1.384     www       866: 	if ($link!~/\#/) { $link.='#'.&escape($part); }
1.133     bowersj2  867:         $title = "";
1.51      bowersj2  868:     }
                    869: 
1.163     bowersj2  870:     if ($params->{'condensed'} && $resource->countParts() > 1) {
1.363     albertel  871:         $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1.51      bowersj2  872:     }
                    873: 
1.268     albertel  874:     my $target;
1.320     albertel  875:     if ($env{'environment.remotenavmap'} eq 'on') {
1.268     albertel  876: 	$target=' target="loncapaclient" ';
                    877:     }
1.266     raeburn   878:     if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1.349     foxr      879:         $result .= "  $curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1.144     bowersj2  880:     } else {
                    881:         $result .= "  $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
                    882:     }
1.51      bowersj2  883: 
1.133     bowersj2  884:     return $result;
                    885: }
1.51      bowersj2  886: 
1.133     bowersj2  887: sub render_communication_status {
                    888:     my ($resource, $part, $params) = @_;
1.134     bowersj2  889:     my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
                    890: 
                    891:     my $link = $params->{"resourceLink"};
1.335     albertel  892:     my $target;
                    893:     if ($env{'environment.remotenavmap'} eq 'on') {
                    894: 	$target=' target="loncapaclient" ';
                    895:     }
1.349     foxr      896:     my $linkopen = "<a $target href=\"$link\">";
1.134     bowersj2  897:     my $linkclose = "</a>";
1.298     albertel  898:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.134     bowersj2  899:     if ($resource->hasDiscussion()) {
                    900:         $discussionHTML = $linkopen .
1.392     albertel  901:             '<img alt="'.&mt('New Discussion').'" border="0" src="'.$location.'/chat.gif" />' .
1.134     bowersj2  902:             $linkclose;
                    903:     }
                    904:     
                    905:     if ($resource->getFeedback()) {
                    906:         my $feedback = $resource->getFeedback();
1.394     raeburn   907:         foreach my $msgid (split(/\,/, $feedback)) {
                    908:             if ($msgid) {
1.335     albertel  909:                 $feedbackHTML .= '&nbsp;<a '.$target.' href="/adm/email?display='
1.394     raeburn   910:                     . &escape($msgid) . '">'
1.392     albertel  911:                     . '<img alt="'.&mt('New Email').'" src="'.$location.'/feedback.gif" '
1.134     bowersj2  912:                     . 'border="0" /></a>';
                    913:             }
                    914:         }
                    915:     }
                    916:     
                    917:     if ($resource->getErrors()) {
                    918:         my $errors = $resource->getErrors();
1.254     matthew   919:         my $errorcount = 0;
1.394     raeburn   920:         foreach my $msgid (split(/,/, $errors)) {
1.254     matthew   921:             last if ($errorcount>=10); # Only output 10 bombs maximum
1.394     raeburn   922:             if ($msgid) {
1.254     matthew   923:                 $errorcount++;
1.335     albertel  924:                 $errorHTML .= '&nbsp;<a '.$target.' href="/adm/email?display='
1.394     raeburn   925:                     . &escape($msgid) . '">'
1.392     albertel  926:                     . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" '
1.134     bowersj2  927:                     . 'border="0" /></a>';
                    928:             }
                    929:         }
1.197     bowersj2  930:     }
                    931: 
                    932:     if ($params->{'multipart'} && $part != '0') {
                    933: 	$discussionHTML = $feedbackHTML = $errorHTML = '';
1.134     bowersj2  934:     }
                    935: 
1.392     albertel  936:     return "<td width=\"75\" align=\"left\" valign=\"middle\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
1.134     bowersj2  937: 
1.133     bowersj2  938: }
                    939: sub render_quick_status {
                    940:     my ($resource, $part, $params) = @_;
1.135     bowersj2  941:     my $result = "";
                    942:     my $firstDisplayed = !$params->{'condensed'} && 
                    943:         $params->{'multipart'} && $part eq "0";
                    944: 
                    945:     my $link = $params->{"resourceLink"};
1.335     albertel  946:     my $target;
                    947:     if ($env{'environment.remotenavmap'} eq 'on') {
                    948: 	$target=' target="loncapaclient" ';
                    949:     }
1.349     foxr      950:     my $linkopen = "<a $target href=\"$link\">";
1.135     bowersj2  951:     my $linkclose = "</a>";
                    952: 
                    953:     if ($resource->is_problem() &&
                    954:         !$firstDisplayed) {
1.224     bowersj2  955: 	
                    956:         my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135     bowersj2  957:         my $alt = $iconAltTags{$icon};
                    958:         if ($icon) {
1.298     albertel  959: 	    my $location=
                    960: 		&Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1.392     albertel  961:             $result .= "<td valign='middle' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1.135     bowersj2  962:         } else {
                    963:             $result .= "<td width='30'>&nbsp;</td>\n";
                    964:         }
                    965:     } else { # not problem, no icon
                    966:         $result .= "<td width='30'>&nbsp;</td>\n";
                    967:     }
                    968: 
                    969:     return $result;
1.133     bowersj2  970: }
                    971: sub render_long_status {
                    972:     my ($resource, $part, $params) = @_;
1.392     albertel  973:     my $result = "<td align='right' valign='middle'>\n";
1.136     bowersj2  974:     my $firstDisplayed = !$params->{'condensed'} && 
                    975:         $params->{'multipart'} && $part eq "0";
                    976:                 
                    977:     my $color;
1.212     bowersj2  978:     if ($resource->is_problem()) {
1.136     bowersj2  979:         $color = $colormap{$resource->status};
                    980:         
1.252     matthew   981:         if (dueInLessThan24Hours($resource, $part) ||
1.136     bowersj2  982:             lastTry($resource, $part)) {
                    983:             $color = $hurryUpColor;
                    984:         }
                    985:     }
                    986:     
                    987:     if ($resource->kind() eq "res" &&
                    988:         $resource->is_problem() &&
                    989:         !$firstDisplayed) {
                    990:         if ($color) {$result .= "<font color=\"$color\"><b>"; }
                    991:         $result .= getDescription($resource, $part);
                    992:         if ($color) {$result .= "</b></font>"; }
                    993:     }
                    994:     if ($resource->is_map() && advancedUser() && $resource->randompick()) {
                    995:         $result .= '(randomly select ' . $resource->randompick() .')';
                    996:     }
1.210     bowersj2  997: 
1.213     bowersj2  998:     # Debugging code
                    999:     #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
                   1000:     #	' - Part: ' . $part;
                   1001: 
1.210     bowersj2 1002:     $result .= "</td>\n";
1.136     bowersj2 1003:     
                   1004:     return $result;
1.51      bowersj2 1005: }
                   1006: 
1.227     bowersj2 1007: # Colors obtained by taking the icons, matching the colors, and
                   1008: # possibly reducing the Value (HSV) of the color, if it's too bright
                   1009: # for text, generally by one third or so.
1.225     bowersj2 1010: my %statusColors = 
                   1011:     (
                   1012:      $resObj->CLOSED => '#000000',
1.227     bowersj2 1013:      $resObj->OPEN   => '#998b13',
                   1014:      $resObj->CORRECT => '#26933f',
                   1015:      $resObj->INCORRECT => '#c48207',
                   1016:      $resObj->ATTEMPTED => '#a87510',
1.225     bowersj2 1017:      $resObj->ERROR => '#000000'
                   1018:      );
                   1019: my %statusStrings = 
                   1020:     (
                   1021:      $resObj->CLOSED => 'Not yet open',
                   1022:      $resObj->OPEN   => 'Open',
                   1023:      $resObj->CORRECT => 'Correct',
                   1024:      $resObj->INCORRECT => 'Incorrect',
                   1025:      $resObj->ATTEMPTED => 'Attempted',
                   1026:      $resObj->ERROR => 'Network Error'
                   1027:      );
                   1028: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
                   1029: 
                   1030: use Data::Dumper;
                   1031: sub render_parts_summary_status {
                   1032:     my ($resource, $part, $params) = @_;
1.256     albertel 1033:     if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1.225     bowersj2 1034:     if ($params->{showParts}) { 
                   1035: 	return '<td></td>';
                   1036:     }
                   1037: 
                   1038:     my $td = "<td align='right'>\n";
                   1039:     my $endtd = "</td>\n";
1.256     albertel 1040:     my @probs;
1.225     bowersj2 1041: 
1.256     albertel 1042:     if ($resource->contains_problem) {
                   1043: 	@probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
                   1044:     } else {
                   1045: 	@probs=($resource);
                   1046:     }
                   1047:     my $return;
                   1048:     my %overallstatus;
                   1049:     my $totalParts;
                   1050:     foreach my $resource (@probs) {
                   1051: 	# If there is a single part, just show the simple status
                   1052: 	if ($resource->singlepart()) {
                   1053: 	    my $status = $resource->simpleStatus(${$resource->parts}[0]);
                   1054: 	    $overallstatus{$status}++;
                   1055: 	    $totalParts++;
                   1056: 	    next;
                   1057: 	}
                   1058: 	# Now we can be sure the $part doesn't really matter.
                   1059: 	my $statusCount = $resource->simpleStatusCount();
                   1060: 	my @counts;
                   1061: 	foreach my $status (@statuses) {
                   1062: 	    # decouple display order from the simpleStatusCount order
                   1063: 	    my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
                   1064: 	    if ($statusCount->[$slot]) {
                   1065: 		$overallstatus{$status}+=$statusCount->[$slot];
                   1066: 		$totalParts+=$statusCount->[$slot];
                   1067: 	    }
                   1068: 	}
                   1069:     }
                   1070:     $return.= $td . $totalParts . ' parts: ';
                   1071:     foreach my $status (@statuses) {
                   1072: 	if ($overallstatus{$status}) {
                   1073: 	    $return.="<font color='" . $statusColors{$status} .
                   1074: 		"'>" . $overallstatus{$status} . ' '
1.225     bowersj2 1075: 		. $statusStrings{$status} . "</font>";
                   1076: 	}
                   1077:     }
1.256     albertel 1078:     $return.= $endtd;
                   1079:     return $return;
1.225     bowersj2 1080: }
                   1081: 
1.133     bowersj2 1082: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225     bowersj2 1083:                        \&render_quick_status, \&render_long_status,
                   1084: 		       \&render_parts_summary_status);
1.132     bowersj2 1085: 
                   1086: sub setDefault {
                   1087:     my ($val, $default) = @_;
                   1088:     if (!defined($val)) { return $default; }
                   1089:     return $val;
                   1090: }
                   1091: 
1.296     albertel 1092: sub cmp_title {
                   1093:     my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
                   1094:     $atitle=~s/^\s*//;
                   1095:     $btitle=~s/^\s*//;
                   1096:     return $atitle cmp $btitle;
                   1097: }
                   1098: 
1.132     bowersj2 1099: sub render {
                   1100:     my $args = shift;
1.140     bowersj2 1101:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                   1102:     my $result = '';
1.132     bowersj2 1103:     # Configure the renderer.
                   1104:     my $cols = $args->{'cols'};
                   1105:     if (!defined($cols)) {
                   1106:         # no columns, no nav maps.
                   1107:         return '';
                   1108:     }
1.140     bowersj2 1109:     my $navmap;
                   1110:     if (defined($args->{'navmap'})) {
                   1111:         $navmap = $args->{'navmap'};
                   1112:     }
                   1113: 
1.158     bowersj2 1114:     my $r = $args->{'r'};
1.140     bowersj2 1115:     my $queryString = $args->{'queryString'};
1.159     bowersj2 1116:     my $jump = $args->{'jump'};
1.158     bowersj2 1117:     my $here = $args->{'here'};
1.153     bowersj2 1118:     my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.256     albertel 1119:     my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1.140     bowersj2 1120:     my $currentJumpDelta = 2; # change this to change how many resources are displayed
                   1121:                              # before the current resource when using #current
                   1122: 
                   1123:     # If we were passed 'here' information, we are not rendering
                   1124:     # after a folder manipulation, and we were not passed an
                   1125:     # iterator, make sure we open the folders to show the "here"
                   1126:     # marker
                   1127:     my $filterHash = {};
                   1128:     # Figure out what we're not displaying
1.394     raeburn  1129:     foreach my $item (split(/\,/, $env{"form.filter"})) {
                   1130:         if ($item) {
                   1131:             $filterHash->{$item} = "1";
1.140     bowersj2 1132:         }
                   1133:     }
                   1134: 
1.191     bowersj2 1135:     # Filter: Remember filter function and add our own filter: Refuse
                   1136:     # to show hidden resources unless the user can see them.
                   1137:     my $userCanSeeHidden = advancedUser();
                   1138:     my $filterFunc = setDefault($args->{'filterFunc'},
                   1139:                                 sub {return 1;});
                   1140:     if (!$userCanSeeHidden) {
                   1141:         # Without renaming the filterfunc, the server seems to go into
                   1142:         # an infinite loop
                   1143:         my $oldFilterFunc = $filterFunc;
                   1144:         $filterFunc = sub { my $res = shift; return !$res->randomout() && 
                   1145:                                 &$oldFilterFunc($res);};
                   1146:     }
                   1147: 
1.140     bowersj2 1148:     my $condition = 0;
1.320     albertel 1149:     if ($env{'form.condition'}) {
1.140     bowersj2 1150:         $condition = 1;
                   1151:     }
                   1152: 
1.320     albertel 1153:     if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1.140     bowersj2 1154:         # Step 1: Check to see if we have a navmap
                   1155:         if (!defined($navmap)) {
1.221     bowersj2 1156:             $navmap = Apache::lonnavmaps::navmap->new();
1.340     albertel 1157: 	    if (!defined($navmap)) {
                   1158: 		# no londer in course
1.388     albertel 1159: 		return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1.362     www      1160:                         <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1.340     albertel 1161: 	    }
                   1162: 	}
1.140     bowersj2 1163: 
                   1164:         # Step two: Locate what kind of here marker is necessary
                   1165:         # Determine where the "here" marker is and where the screen jumps to.
                   1166: 
1.332     albertel 1167:         if ($env{'form.postsymb'} ne '') {
1.320     albertel 1168:             $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1.332     albertel 1169:         } elsif ($env{'form.postdata'} ne '') {
1.140     bowersj2 1170:             # couldn't find a symb, is there a URL?
1.320     albertel 1171:             my $currenturl = $env{'form.postdata'};
1.158     bowersj2 1172:             #$currenturl=~s/^http\:\/\///;
                   1173:             #$currenturl=~s/^[^\/]+//;
1.140     bowersj2 1174:             
1.158     bowersj2 1175:             $here = $jump = &Apache::lonnet::symbread($currenturl);
1.331     albertel 1176: 	}
                   1177: 	if ($here eq '') {
1.317     albertel 1178: 	    my $last;
1.320     albertel 1179: 	    if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.317     albertel 1180:                     &GDBM_READER(),0640)) {
                   1181: 		$last=$hash{'last_known'};
                   1182: 		untie(%hash);
                   1183: 	    }
                   1184: 	    if ($last) { $here = $jump = $last; }
                   1185: 	}
1.158     bowersj2 1186: 
1.140     bowersj2 1187:         # Step three: Ensure the folders are open
                   1188:         my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2 1189:         my $curRes;
1.140     bowersj2 1190:         my $found = 0;
                   1191:         
                   1192:         # We only need to do this if we need to open the maps to show the
                   1193:         # current position. This will change the counter so we can't count
                   1194:         # for the jump marker with this loop.
1.294     albertel 1195:         while ($here && ($curRes = $mapIterator->next()) && !$found) {
1.158     bowersj2 1196:             if (ref($curRes) && $curRes->symb() eq $here) {
1.140     bowersj2 1197:                 my $mapStack = $mapIterator->getStack();
                   1198:                 
                   1199:                 # Ensure the parent maps are open
                   1200:                 for my $map (@{$mapStack}) {
                   1201:                     if ($condition) {
                   1202:                         undef $filterHash->{$map->map_pc()};
                   1203:                     } else {
                   1204:                         $filterHash->{$map->map_pc()} = 1;
                   1205:                     }
                   1206:                 }
                   1207:                 $found = 1;
                   1208:             }
                   1209:         }            
1.159     bowersj2 1210:     }        
1.140     bowersj2 1211: 
1.320     albertel 1212:     if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1.140     bowersj2 1213:         # If this is a click on a folder or something, we want to preserve the "here"
                   1214:         # from the querystring, and get the new "jump" marker
1.320     albertel 1215:         $here = $env{'form.here'};
                   1216:         $jump = $env{'form.jump'};
1.140     bowersj2 1217:     } 
                   1218:     
1.132     bowersj2 1219:     my $it = $args->{'iterator'};
                   1220:     if (!defined($it)) {
1.320     albertel 1221:         # Construct a default iterator based on $env{'form.'} information
1.140     bowersj2 1222:         
                   1223:         # Step 1: Check to see if we have a navmap
                   1224:         if (!defined($navmap)) {
1.221     bowersj2 1225:             $navmap = Apache::lonnavmaps::navmap->new();
1.140     bowersj2 1226:         }
                   1227: 
1.144     bowersj2 1228:         # See if we're being passed a specific map
                   1229:         if ($args->{'iterator_map'}) {
                   1230:             my $map = $args->{'iterator_map'};
1.145     bowersj2 1231:             $map = $navmap->getResourceByUrl($map);
1.144     bowersj2 1232:             my $firstResource = $map->map_start();
                   1233:             my $finishResource = $map->map_finish();
                   1234: 
                   1235:             $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
                   1236:         } else {
                   1237:             $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
                   1238:         }
1.132     bowersj2 1239:     }
1.256     albertel 1240: 
1.159     bowersj2 1241:     # (re-)Locate the jump point, if any
1.191     bowersj2 1242:     # Note this does not take filtering or hidden into account... need
                   1243:     # to be fixed?
1.159     bowersj2 1244:     my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222     bowersj2 1245:     my $curRes;
1.159     bowersj2 1246:     my $foundJump = 0;
                   1247:     my $counter = 0;
                   1248:     
1.222     bowersj2 1249:     while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159     bowersj2 1250:         if (ref($curRes)) { $counter++; }
                   1251:         
                   1252:         if (ref($curRes) && $jump eq $curRes->symb()) {
                   1253:             
                   1254:             # This is why we have to use the main iterator instead of the
                   1255:             # potentially faster DFS: The count has to be the same, so
                   1256:             # the order has to be the same, which DFS won't give us.
                   1257:             $args->{'currentJumpIndex'} = $counter;
                   1258:             $foundJump = 1;
                   1259:         }
                   1260:     }
                   1261: 
1.132     bowersj2 1262:     my $showParts = setDefault($args->{'showParts'}, 1);
                   1263:     my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139     bowersj2 1264:     # keeps track of when the current resource is found,
                   1265:     # so we can back up a few and put the anchor above the
                   1266:     # current resource
1.140     bowersj2 1267:     my $printKey = $args->{'printKey'};
                   1268:     my $printCloseAll = $args->{'printCloseAll'};
                   1269:     if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.298     albertel 1270: 
1.140     bowersj2 1271:     # Print key?
                   1272:     if ($printKey) {
                   1273:         $result .= '<table border="0" cellpadding="2" cellspacing="0">';
                   1274:         my $date=localtime;
                   1275:         $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
1.298     albertel 1276: 	my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.140     bowersj2 1277:         if ($navmap->{LAST_CHECK}) {
                   1278:             $result .= 
1.298     albertel 1279:                 '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1.140     bowersj2 1280:                 strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   1281:                 '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
1.298     albertel 1282:                 '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1.140     bowersj2 1283:                 '</td>'; 
                   1284:         } else {
                   1285:             $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
1.298     albertel 1286:                 '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
                   1287:                 '&nbsp;&nbsp;<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1.140     bowersj2 1288:                 '</td>'; 
                   1289:         }
                   1290: 
                   1291:         $result .= '</tr></table>';
                   1292:     }
                   1293: 
1.172     bowersj2 1294:     if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.281     albertel 1295: 	my ($link,$text);
1.140     bowersj2 1296:         if ($condition) {
1.392     albertel 1297: 	    $link='"navmaps?condition=0&amp;filter=&amp;'.$queryString.
1.384     www      1298: 		'&here='.&escape($here).'"';
1.377     www      1299: 	    $text='Close all folders';
1.140     bowersj2 1300:         } else {
1.392     albertel 1301: 	    $link='"navmaps?condition=1&amp;filter=&amp;'.$queryString.
1.384     www      1302: 		'&here='.&escape($here).'"';
1.377     www      1303: 	    $text='Open all folders';
1.281     albertel 1304:         }
                   1305: 	if ($args->{'caller'} eq 'navmapsdisplay') {
                   1306: 	    &add_linkitem($args->{'linkitems'},'changefolder',
                   1307: 			  'location.href='.$link,$text);
                   1308: 	} else {
                   1309: 	    $result.='<a href='.$link.'>'.&mt($text).'</a>';
                   1310: 	}
1.266     raeburn  1311:         $result .= "\n";
                   1312:     }
1.140     bowersj2 1313: 
1.266     raeburn  1314:     # Check for any unread discussions in all resources.
1.281     albertel 1315:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.296     albertel 1316: 	&add_linkitem($args->{'linkitems'},'clearbubbles',
                   1317: 		      'document.clearbubbles.submit()',
                   1318: 		      'Mark all posts read');
1.297     albertel 1319: 	my $time=time;
1.296     albertel 1320: 	$result .= (<<END);
                   1321:     <form name="clearbubbles" method="post" action="/adm/feedback">
                   1322: 	<input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1.297     albertel 1323: 	<input type="hidden" name="navtime" value="$time" />
1.296     albertel 1324: END
                   1325:         if ($args->{'sort'} eq 'discussion') { 
                   1326: 	    my $totdisc = 0;
                   1327: 	    my $haveDisc = '';
                   1328: 	    my @allres=$navmap->retrieveResources();
                   1329: 	    foreach my $resource (@allres) {
                   1330: 		if ($resource->hasDiscussion()) {
1.323     albertel 1331: 		    $haveDisc .= $resource->wrap_symb().':';
1.296     albertel 1332: 		    $totdisc ++;
1.267     albertel 1333: 		}
                   1334: 	    }
1.296     albertel 1335: 	    if ($totdisc > 0) {
                   1336: 		$haveDisc =~ s/:$//;
                   1337: 		$result .= (<<END);
                   1338: 	<input type="hidden" name="navmaps" value="$haveDisc" />
                   1339:     </form>
                   1340: END
                   1341:             }
1.297     albertel 1342: 	}
                   1343: 	$result.='</form>';
1.266     raeburn  1344:     }
1.276     albertel 1345: 
1.281     albertel 1346:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.283     raeburn  1347:         $result .= '<table><tr><td>'.
1.388     albertel 1348:                    &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1.320     albertel 1349: 	if ($env{'environment.remotenavmap'} ne 'on') {
1.283     raeburn  1350: 	    $result .= '<td>&nbsp;</td>'; 
                   1351:         } else {
                   1352: 	    $result .= '</tr><tr>'; 
                   1353:         }
1.281     albertel 1354: 	$result.=&show_linkitems($args->{'linkitems'});
                   1355:         if ($args->{'sort_html'}) {
1.320     albertel 1356: 	    if ($env{'environment.remotenavmap'} ne 'on') {
1.281     albertel 1357: 		$result.='<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>'.
                   1358: 		    '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
                   1359: 	    } else {
                   1360: 		$result.='</tr><tr><td align="left"><br />'.
                   1361: 		    $args->{'sort_html'}.'</td></tr>';
                   1362: 	    }
                   1363: 	}
                   1364:         $result .= '</table>';
                   1365:     } elsif ($args->{'sort_html'}) { 
                   1366:         $result.=$args->{'sort_html'}; 
                   1367:     }
1.276     albertel 1368: 
1.266     raeburn  1369:     $result .= "<br />\n";
1.140     bowersj2 1370:     if ($r) {
                   1371:         $r->print($result);
                   1372:         $r->rflush();
                   1373:         $result = "";
                   1374:     }
1.132     bowersj2 1375:     # End parameter setting
1.133     bowersj2 1376:             
1.132     bowersj2 1377:     # Data
1.140     bowersj2 1378:     $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132     bowersj2 1379:     my $res = "Apache::lonnavmaps::resource";
                   1380:     my %condenseStatuses =
                   1381:         ( $res->NETWORK_FAILURE    => 1,
                   1382:           $res->NOTHING_SET        => 1,
                   1383:           $res->CORRECT            => 1 );
                   1384:     my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133     bowersj2 1385: 
                   1386:     # Shared variables
                   1387:     $args->{'counter'} = 0; # counts the rows
                   1388:     $args->{'indentLevel'} = 0;
                   1389:     $args->{'isNewBranch'} = 0;
                   1390:     $args->{'condensed'} = 0;    
1.298     albertel 1391:     my $location=
                   1392: 	&Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1.329     albertel 1393:     $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='&nbsp;&nbsp;' border='0' />");
1.133     bowersj2 1394:     $args->{'displayedHereMarker'} = 0;
1.132     bowersj2 1395: 
1.190     bowersj2 1396:     # If we're suppressing empty sequences, look for them here. Use DFS for speed,
                   1397:     # since structure actually doesn't matter, except what map has what resources.
                   1398:     if ($args->{'suppressEmptySequences'}) {
                   1399:         my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
                   1400:                                                          $it->{FIRST_RESOURCE},
                   1401:                                                          $it->{FINISH_RESOURCE},
                   1402:                                                          {}, undef, 1);
1.222     bowersj2 1403:         my $depth = 0;
1.190     bowersj2 1404:         $dfsit->next();
                   1405:         my $curRes = $dfsit->next();
                   1406:         while ($depth > -1) {
                   1407:             if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
                   1408:             if ($curRes == $dfsit->END_MAP()) { $depth--; }
                   1409: 
                   1410:             if (ref($curRes)) { 
                   1411:                 # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201     bowersj2 1412:                 if ($curRes->is_map()) {
1.190     bowersj2 1413:                     $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
                   1414:                     # Sequences themselves do not count as visible children,
                   1415:                     # unless those sequences also have visible children.
                   1416:                     # This means if a sequence appears, there's a "promise"
                   1417:                     # that there's something under it if you open it, somewhere.
                   1418:                 } else {
                   1419:                     # Not a sequence: if it's filtered, ignore it, otherwise
                   1420:                     # rise up the stack and mark the sequences as having children
                   1421:                     if (&$filterFunc($curRes)) {
                   1422:                         for my $sequence (@{$dfsit->getStack()}) {
                   1423:                             $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
                   1424:                         }
                   1425:                     }
                   1426:                 }
                   1427:             }
                   1428:         } continue {
                   1429:             $curRes = $dfsit->next();
                   1430:         }
                   1431:     }
                   1432: 
1.133     bowersj2 1433:     my $displayedJumpMarker = 0;
1.132     bowersj2 1434:     # Set up iteration.
                   1435:     my $now = time();
                   1436:     my $in24Hours = $now + 24 * 60 * 60;
                   1437:     my $rownum = 0;
                   1438: 
1.141     bowersj2 1439:     # export "here" marker information
                   1440:     $args->{'here'} = $here;
                   1441: 
1.222     bowersj2 1442:     $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1.270     albertel 1443:     my @resources;
                   1444:     my $code='';# sub { !(shift->is_map();) };
                   1445:     if ($args->{'sort'} eq 'title') {
1.276     albertel 1446:         my $oldFilterFunc = $filterFunc;
                   1447: 	my $filterFunc= 
                   1448: 	    sub {
                   1449: 		my ($res)=@_;
                   1450: 		if ($res->is_map()) { return 0;}
                   1451: 		return &$oldFilterFunc($res);
                   1452: 	    };
                   1453: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.296     albertel 1454: 	@resources= sort { &cmp_title($a,$b) } @resources;
                   1455:     } elsif ($args->{'sort'} eq 'duedate') {
                   1456: 	my $oldFilterFunc = $filterFunc;
                   1457: 	my $filterFunc= 
                   1458: 	    sub {
                   1459: 		my ($res)=@_;
                   1460: 		if (!$res->is_problem()) { return 0;}
                   1461: 		return &$oldFilterFunc($res);
                   1462: 	    };
                   1463: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.289     raeburn  1464: 	@resources= sort {
1.270     albertel 1465: 	    if ($a->duedate ne $b->duedate) {
                   1466: 	        return $a->duedate cmp $b->duedate;
                   1467: 	    }
1.296     albertel 1468: 	    my $value=&cmp_title($a,$b);
                   1469: 	    return $value;
1.270     albertel 1470: 	} @resources;
1.296     albertel 1471:     } elsif ($args->{'sort'} eq 'discussion') {
                   1472: 	my $oldFilterFunc = $filterFunc;
                   1473: 	my $filterFunc= 
                   1474: 	    sub {
                   1475: 		my ($res)=@_;
                   1476: 		if (!$res->hasDiscussion() &&
                   1477: 		    !$res->getFeedback() &&
                   1478: 		    !$res->getErrors()) { return 0;}
                   1479: 		return &$oldFilterFunc($res);
                   1480: 	    };
                   1481: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
                   1482: 	@resources= sort { &cmp_title($a,$b) } @resources;
1.276     albertel 1483:     } else {
                   1484: 	#unknow sort mechanism or default
                   1485: 	undef($args->{'sort'});
1.270     albertel 1486:     }
                   1487: 
1.276     albertel 1488: 
1.270     albertel 1489:     while (1) {
                   1490: 	if ($args->{'sort'}) {
                   1491: 	    $curRes = shift(@resources);
                   1492: 	} else {
                   1493: 	    $curRes = $it->next($closeAllPages);
                   1494: 	}
                   1495: 	if (!$curRes) { last; }
                   1496: 
1.132     bowersj2 1497:         # Maintain indentation level.
                   1498:         if ($curRes == $it->BEGIN_MAP() ||
                   1499:             $curRes == $it->BEGIN_BRANCH() ) {
1.133     bowersj2 1500:             $args->{'indentLevel'}++;
1.132     bowersj2 1501:         }
                   1502:         if ($curRes == $it->END_MAP() ||
                   1503:             $curRes == $it->END_BRANCH() ) {
1.133     bowersj2 1504:             $args->{'indentLevel'}--;
1.132     bowersj2 1505:         }
                   1506:         # Notice new branches
                   1507:         if ($curRes == $it->BEGIN_BRANCH()) {
1.133     bowersj2 1508:             $args->{'isNewBranch'} = 1;
                   1509:         }
                   1510: 
                   1511:         # If this isn't an actual resource, continue on
                   1512:         if (!ref($curRes)) {
                   1513:             next;
1.132     bowersj2 1514:         }
1.133     bowersj2 1515: 
1.143     bowersj2 1516:         # If this has been filtered out, continue on
                   1517:         if (!(&$filterFunc($curRes))) {
                   1518:             $args->{'isNewBranch'} = 0; # Don't falsely remember this
                   1519:             next;
                   1520:         } 
1.132     bowersj2 1521: 
1.190     bowersj2 1522:         # If this is an empty sequence and we're filtering them, continue on
1.201     bowersj2 1523:         if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190     bowersj2 1524:             !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
                   1525:             next;
                   1526:         }
                   1527: 
1.153     bowersj2 1528:         # If we're suppressing navmaps and this is a navmap, continue on
                   1529:         if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
                   1530:             next;
                   1531:         }
                   1532: 
1.191     bowersj2 1533:         $args->{'counter'}++;
                   1534: 
1.132     bowersj2 1535:         # Does it have multiple parts?
1.133     bowersj2 1536:         $args->{'multipart'} = 0;
                   1537:         $args->{'condensed'} = 0;
1.132     bowersj2 1538:         my @parts;
                   1539:             
                   1540:         # Decide what parts to show.
1.133     bowersj2 1541:         if ($curRes->is_problem() && $showParts) {
1.132     bowersj2 1542:             @parts = @{$curRes->parts()};
1.192     bowersj2 1543:             $args->{'multipart'} = $curRes->multipart();
1.132     bowersj2 1544:             
                   1545:             if ($condenseParts) { # do the condensation
1.133     bowersj2 1546:                 if (!$args->{'condensed'}) {
1.132     bowersj2 1547:                     # Decide whether to condense based on similarity
1.192     bowersj2 1548:                     my $status = $curRes->status($parts[0]);
                   1549:                     my $due = $curRes->duedate($parts[0]);
                   1550:                     my $open = $curRes->opendate($parts[0]);
1.132     bowersj2 1551:                     my $statusAllSame = 1;
                   1552:                     my $dueAllSame = 1;
                   1553:                     my $openAllSame = 1;
1.192     bowersj2 1554:                     for (my $i = 1; $i < scalar(@parts); $i++) {
1.132     bowersj2 1555:                         if ($curRes->status($parts[$i]) != $status){
                   1556:                             $statusAllSame = 0;
                   1557:                         }
                   1558:                         if ($curRes->duedate($parts[$i]) != $due ) {
                   1559:                             $dueAllSame = 0;
                   1560:                         }
                   1561:                         if ($curRes->opendate($parts[$i]) != $open) {
                   1562:                             $openAllSame = 0;
                   1563:                         }
                   1564:                     }
                   1565:                     # $*allSame is true if all the statuses were
                   1566:                     # the same. Now, if they are all the same and
                   1567:                     # match one of the statuses to condense, or they
                   1568:                     # are all open with the same due date, or they are
                   1569:                     # all OPEN_LATER with the same open date, display the
                   1570:                     # status of the first non-zero part (to get the 'correct'
                   1571:                     # status right, since 0 is never 'correct' or 'open').
                   1572:                     if (($statusAllSame && defined($condenseStatuses{$status})) ||
                   1573:                         ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                   1574:                         ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192     bowersj2 1575:                         @parts = ($parts[0]);
1.133     bowersj2 1576:                         $args->{'condensed'} = 1;
1.132     bowersj2 1577:                     }
                   1578:                 }
1.198     bowersj2 1579: 		# Multipart problem with one part: always "condense" (happens
                   1580: 		#  to match the desirable behavior)
                   1581: 		if ($curRes->countParts() == 1) {
                   1582: 		    @parts = ($parts[0]);
                   1583: 		    $args->{'condensed'} = 1;
                   1584: 		}
1.132     bowersj2 1585:             }
1.157     bowersj2 1586:         } 
1.132     bowersj2 1587:             
                   1588:         # If the multipart problem was condensed, "forget" it was multipart
                   1589:         if (scalar(@parts) == 1) {
1.133     bowersj2 1590:             $args->{'multipart'} = 0;
1.192     bowersj2 1591:         } else {
                   1592:             # Add part 0 so we display it correctly.
                   1593:             unshift @parts, '0';
1.132     bowersj2 1594:         }
1.310     albertel 1595: 	
                   1596: 	{
                   1597: 	    my ($src,$symb,$anchor,$stack);
                   1598: 	    if ($args->{'sort'}) {
                   1599: 		my $it = $navmap->getIterator(undef, undef, undef, 1);
                   1600: 		while ( my $res=$it->next()) {
                   1601: 		    if (ref($res) &&
                   1602: 			$res->symb() eq  $curRes->symb()) { last; }
                   1603: 		}
                   1604: 		$stack=$it->getStack();
                   1605: 	    } else {
                   1606: 		$stack=$it->getStack();
                   1607: 	    }
                   1608: 	    ($src,$symb,$anchor)=getLinkForResource($stack);
                   1609: 	    if (defined($anchor)) { $anchor='#'.$anchor; }
                   1610: 	    my $srcHasQuestion = $src =~ /\?/;
                   1611: 	    $args->{"resourceLink"} = $src.
                   1612: 		($srcHasQuestion?'&':'?') .
1.384     www      1613: 		'symb=' . &escape($symb).$anchor;
1.310     albertel 1614: 	}
1.132     bowersj2 1615:         # Now, we've decided what parts to show. Loop through them and
                   1616:         # show them.
1.192     bowersj2 1617:         foreach my $part (@parts) {
1.132     bowersj2 1618:             $rownum ++;
                   1619:             my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
                   1620:             
                   1621:             $result .= "  <tr bgcolor='$backgroundColor'>\n";
1.134     bowersj2 1622: 
                   1623:             # Set up some data about the parts that the cols might want
                   1624:             my $filter = $it->{FILTER};
1.270     albertel 1625: 
1.132     bowersj2 1626:             # Now, display each column.
                   1627:             foreach my $col (@$cols) {
1.139     bowersj2 1628:                 my $colHTML = '';
                   1629:                 if (ref($col)) {
                   1630:                     $colHTML .= &$col($curRes, $part, $args);
                   1631:                 } else {
                   1632:                     $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
                   1633:                 }
1.132     bowersj2 1634: 
1.133     bowersj2 1635:                 # If this is the first column and it's time to print
                   1636:                 # the anchor, do so
                   1637:                 if ($col == $cols->[0] && 
                   1638:                     $args->{'counter'} == $args->{'currentJumpIndex'} - 
1.139     bowersj2 1639:                     $currentJumpDelta) {
                   1640:                     # Jam the anchor after the <td> tag;
                   1641:                     # necessary for valid HTML (which Mozilla requires)
                   1642:                     $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133     bowersj2 1643:                     $displayedJumpMarker = 1;
                   1644:                 }
1.139     bowersj2 1645:                 $result .= $colHTML . "\n";
1.132     bowersj2 1646:             }
1.139     bowersj2 1647:             $result .= "    </tr>\n";
1.140     bowersj2 1648:             $args->{'isNewBranch'} = 0;
1.139     bowersj2 1649:         }
1.153     bowersj2 1650: 
1.139     bowersj2 1651:         if ($r && $rownum % 20 == 0) {
                   1652:             $r->print($result);
                   1653:             $result = "";
                   1654:             $r->rflush();
1.132     bowersj2 1655:         }
1.156     bowersj2 1656:     } continue {
1.208     bowersj2 1657: 	if ($r) {
                   1658: 	    # If we have the connection, make sure the user is still connected
                   1659: 	    my $c = $r->connection;
                   1660: 	    if ($c->aborted()) {
                   1661: 		# Who cares what we do, nobody will see it anyhow.
                   1662: 		return '';
                   1663: 	    }
                   1664: 	}
1.132     bowersj2 1665:     }
                   1666:     
1.134     bowersj2 1667:     # Print out the part that jumps to #curloc if it exists
1.159     bowersj2 1668:     # delay needed because the browser is processing the jump before
                   1669:     # it finishes rendering, so it goes to the wrong place!
                   1670:     # onload might be better, but this routine has no access to that.
                   1671:     # On mozilla, the 0-millisecond timeout seems to prevent this;
                   1672:     # it's quite likely this might fix other browsers, too, and 
                   1673:     # certainly won't hurt anything.
1.139     bowersj2 1674:     if ($displayedJumpMarker) {
1.247     albertel 1675:         $result .= "
                   1676: <script>
                   1677: if (location.href.indexOf('#curloc')==-1) {
                   1678:     setTimeout(\"location += '#curloc';\", 0)
                   1679: }
                   1680: </script>";
1.134     bowersj2 1681:     }
                   1682: 
1.132     bowersj2 1683:     $result .= "</table>";
1.140     bowersj2 1684:     
                   1685:     if ($r) {
                   1686:         $r->print($result);
                   1687:         $result = "";
                   1688:         $r->rflush();
                   1689:     }
                   1690:         
1.132     bowersj2 1691:     return $result;
                   1692: }
                   1693: 
1.281     albertel 1694: sub add_linkitem {
                   1695:     my ($linkitems,$name,$cmd,$text)=@_;
                   1696:     $$linkitems{$name}{'cmd'}=$cmd;
                   1697:     $$linkitems{$name}{'text'}=&mt($text);
                   1698: }
                   1699: 
                   1700: sub show_linkitems {
                   1701:     my ($linkitems)=@_;
1.312     albertel 1702:     my @linkorder = ("blank","launchnav","closenav","firsthomework",
                   1703: 		     "everything","uncompleted","changefolder","clearbubbles");
1.281     albertel 1704:     
                   1705:     my $result .= (<<ENDBLOCK);
1.283     raeburn  1706:               <td align="left">
1.281     albertel 1707: <script type="text/javascript">
                   1708:     function changeNavDisplay () {
                   1709: 	var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
                   1710: ENDBLOCK
                   1711:     foreach my $link (@linkorder) {
                   1712: 	$result.= "if (navchoice == '$link') {".
                   1713: 	    $linkitems->{$link}{'cmd'}."}\n";
                   1714:     }
                   1715:     $result.='}
                   1716:               </script>
                   1717:                    <form name="linkitems" method="post">
                   1718:                        <nobr><select name="toplink">'."\n";
                   1719:     foreach my $link (@linkorder) {
                   1720: 	if (defined($linkitems->{$link})) {
                   1721: 	    if ($linkitems->{$link}{'text'} ne '') {
                   1722: 		$result .= ' <option value="'.$link.'">'.
                   1723: 		    $linkitems->{$link}{'text'}."</option>\n";
                   1724: 	    }
                   1725: 	}
                   1726:     }
                   1727:     $result .= '</select>&nbsp;<input type="button" name="chgnav"
                   1728:                    value="Go" onClick="javascript:changeNavDisplay()" />
                   1729:                 </nobr></form></td>'."\n";
1.298     albertel 1730: 	
1.281     albertel 1731:     return $result;
                   1732: }
                   1733: 
1.133     bowersj2 1734: 1;
                   1735: 
                   1736: package Apache::lonnavmaps::navmap;
                   1737: 
                   1738: =pod
                   1739: 
1.216     bowersj2 1740: =head1 Object: Apache::lonnavmaps::navmap
1.133     bowersj2 1741: 
1.217     bowersj2 1742: =head2 Overview
1.133     bowersj2 1743: 
1.217     bowersj2 1744: The navmap object's job is to provide access to the resources
                   1745: in the course as Apache::lonnavmaps::resource objects, and to
                   1746: query and manage the relationship between those resource objects.
                   1747: 
                   1748: Generally, you'll use the navmap object in one of three basic ways.
                   1749: In order of increasing complexity and power:
                   1750: 
                   1751: =over 4
                   1752: 
1.358     albertel 1753: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1.217     bowersj2 1754:     various ways to obtain resource objects, based on various identifiers.
                   1755:     Use this when you want to request information about one object or 
                   1756:     a handful of resources you already know the identities of, from some
                   1757:     other source. For more about Ids, Symbs, and MapPcs, see the
                   1758:     Resource documentation. Note that Url should be a B<last resort>,
1.358     albertel 1759:     not your first choice; it only really works when there is only one
1.217     bowersj2 1760:     instance of the resource in the course, which only applies to
1.358     albertel 1761:     maps, and even that may change in the future (see the B<getResourceByUrl>
                   1762:     documentation for more details.)
1.217     bowersj2 1763: 
                   1764: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
                   1765:     retrieves resources matching some criterion and returns them
                   1766:     in a flat array, with no structure information. Use this when
                   1767:     you are manipulating a series of resources, based on what map
                   1768:     the are in, but do not care about branching, or exactly how
                   1769:     the maps and resources are related. This is the most common case.
                   1770: 
                   1771: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
                   1772:     the course's navmap in various ways without writing the traversal
                   1773:     code yourself. See iterator documentation below. Use this when
                   1774:     you need to know absolutely everything about the course, including
                   1775:     branches and the precise relationship between maps and resources.
                   1776: 
                   1777: =back
                   1778: 
                   1779: =head2 Creation And Destruction
                   1780: 
                   1781: To create a navmap object, use the following function:
1.133     bowersj2 1782: 
                   1783: =over 4
                   1784: 
1.221     bowersj2 1785: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133     bowersj2 1786: 
1.221     bowersj2 1787: Creates a new navmap object. Returns the navmap object if this is
                   1788: successful, or B<undef> if not.
1.174     albertel 1789: 
1.216     bowersj2 1790: =back
                   1791: 
                   1792: =head2 Methods
                   1793: 
                   1794: =over 4
                   1795: 
1.174     albertel 1796: =item * B<getIterator>(first, finish, filter, condition):
                   1797: 
                   1798: See iterator documentation below.
1.133     bowersj2 1799: 
                   1800: =cut
                   1801: 
                   1802: use strict;
                   1803: use GDBM_File;
1.320     albertel 1804: use Apache::lonnet;
1.133     bowersj2 1805: 
                   1806: sub new {
                   1807:     # magic invocation to create a class instance
                   1808:     my $proto = shift;
                   1809:     my $class = ref($proto) || $proto;
                   1810:     my $self = {};
                   1811: 
                   1812:     # Resource cache stores navmap resources as we reference them. We generate
                   1813:     # them on-demand so we don't pay for creating resources unless we use them.
                   1814:     $self->{RESOURCE_CACHE} = {};
                   1815: 
                   1816:     # Network failure flag, if we accessed the course or user opt and
                   1817:     # failed
                   1818:     $self->{NETWORK_FAILURE} = 0;
                   1819: 
                   1820:     # tie the nav hash
                   1821: 
1.168     bowersj2 1822:     my %navmaphash;
                   1823:     my %parmhash;
1.320     albertel 1824:     my $courseFn = $env{"request.course.fn"};
1.220     bowersj2 1825:     if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133     bowersj2 1826:               &GDBM_READER(), 0640))) {
                   1827:         return undef;
                   1828:     }
                   1829:     
1.220     bowersj2 1830:     if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133     bowersj2 1831:               &GDBM_READER(), 0640)))
                   1832:     {
1.170     matthew  1833:         untie %{$self->{PARM_HASH}};
1.133     bowersj2 1834:         return undef;
                   1835:     }
                   1836: 
1.199     bowersj2 1837:     $self->{NAV_HASH} = \%navmaphash;
1.168     bowersj2 1838:     $self->{PARM_HASH} = \%parmhash;
1.221     bowersj2 1839:     $self->{PARM_CACHE} = {};
1.133     bowersj2 1840: 
                   1841:     bless($self);
                   1842:         
                   1843:     return $self;
                   1844: }
                   1845: 
1.221     bowersj2 1846: sub generate_course_user_opt {
1.133     bowersj2 1847:     my $self = shift;
1.221     bowersj2 1848:     if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133     bowersj2 1849: 
1.320     albertel 1850:     my $uname=$env{'user.name'};
                   1851:     my $udom=$env{'user.domain'};
                   1852:     my $cid=$env{'request.course.id'};
1.326     albertel 1853:     my $cdom=$env{'course.'.$cid.'.domain'};
                   1854:     my $cnum=$env{'course.'.$cid.'.num'};
1.221     bowersj2 1855:     
1.133     bowersj2 1856: # ------------------------------------------------- Get coursedata (if present)
1.326     albertel 1857:     my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
                   1858:     # Check for network failure
                   1859:     if (!ref($courseopt)) {
                   1860: 	if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
1.324     albertel 1861: 	    $self->{NETWORK_FAILURE} = 1;
1.221     bowersj2 1862: 	}
1.326     albertel 1863: 	undef($courseopt);
                   1864:     }
1.325     albertel 1865: 
1.133     bowersj2 1866: # --------------------------------------------------- Get userdata (if present)
1.325     albertel 1867: 	
1.326     albertel 1868:     my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
                   1869:     # Check for network failure
                   1870:     if (!ref($useropt)) {
                   1871: 	if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
1.324     albertel 1872: 	    $self->{NETWORK_FAILURE} = 1;
1.221     bowersj2 1873: 	}
1.326     albertel 1874: 	undef($useropt);
1.221     bowersj2 1875:     }
                   1876: 
1.326     albertel 1877:     $self->{COURSE_OPT} = $courseopt;
                   1878:     $self->{USER_OPT} = $useropt;
                   1879: 
1.221     bowersj2 1880:     $self->{COURSE_USER_OPT_GENERATED} = 1;
                   1881:     
                   1882:     return;
                   1883: }
                   1884: 
                   1885: sub generate_email_discuss_status {
                   1886:     my $self = shift;
1.259     raeburn  1887:     my $symb = shift;
1.221     bowersj2 1888:     if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133     bowersj2 1889: 
1.320     albertel 1890:     my $cid=$env{'request.course.id'};
1.326     albertel 1891:     my $cdom=$env{'course.'.$cid.'.domain'};
                   1892:     my $cnum=$env{'course.'.$cid.'.num'};
1.221     bowersj2 1893:     
                   1894:     my %emailstatus = &Apache::lonnet::dump('email_status');
                   1895:     my $logoutTime = $emailstatus{'logout'};
1.320     albertel 1896:     my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
1.221     bowersj2 1897:     $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
                   1898: 			   $courseLeaveTime : $logoutTime);
                   1899:     my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                   1900: 					       $cdom, $cnum);
1.259     raeburn  1901:     my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1.320     albertel 1902:                                         $env{'user.domain'},$env{'user.name'},'lastread');
1.259     raeburn  1903:     my %lastreadtime = ();
1.394     raeburn  1904:     foreach my $key (keys %lastread) {
                   1905:         my $shortkey = $key;
                   1906:         $shortkey =~ s/_lastread$//;
                   1907:         $lastreadtime{$shortkey} = $lastread{$key};
1.259     raeburn  1908:     }
                   1909: 
1.221     bowersj2 1910:     my %feedback=();
                   1911:     my %error=();
1.325     albertel 1912:     my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
                   1913: 					$env{'user.name'});
1.221     bowersj2 1914:     
1.325     albertel 1915:     foreach my $msgid (@keys) {
1.295     albertel 1916: 	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
1.395   ! raeburn  1917:             my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
        !          1918:                 $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
        !          1919:             if (defined($symb)) {
        !          1920:                 if (defined($error) && $error == 1) {
        !          1921:                     $error{$symb}.=','.$msgid;
        !          1922:                 } else {
        !          1923:                     $feedback{$symb}.=','.$msgid;
        !          1924:                 }
        !          1925:             } else {
        !          1926:                 my $plain=
        !          1927:                     &LONCAPA::unescape(&LONCAPA::unescape($msgid));
        !          1928:                 if ($plain=~/ \[([^\]]+)\]\:/) {
        !          1929:                     my $url=$1;
        !          1930:                     if ($plain=~/\:Error \[/) {
        !          1931:                         $error{$url}.=','.$msgid;
        !          1932:                     } else {
        !          1933:                         $feedback{$url}.=','.$msgid;
        !          1934:                     }
        !          1935:                 }
        !          1936:             }
1.221     bowersj2 1937: 	}
1.211     bowersj2 1938:     }
1.221     bowersj2 1939:     
1.395   ! raeburn  1940:     #symbs of resources that have feedbacks (will be urls pre-2.3)
1.221     bowersj2 1941:     $self->{FEEDBACK} = \%feedback;
1.395   ! raeburn  1942:     #or errors (will be urls pre 2.3)
1.295     albertel 1943:     $self->{ERROR_MSG} = \%error;
1.221     bowersj2 1944:     $self->{DISCUSSION_TIME} = \%discussiontime;
                   1945:     $self->{EMAIL_STATUS} = \%emailstatus;
1.259     raeburn  1946:     $self->{LAST_READ} = \%lastreadtime;
1.221     bowersj2 1947:     
                   1948:     $self->{EMAIL_DISCUSS_GENERATED} = 1;
                   1949: }
                   1950: 
                   1951: sub get_user_data {
                   1952:     my $self = shift;
                   1953:     if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211     bowersj2 1954: 
1.221     bowersj2 1955:     # Retrieve performance data on problems
1.320     albertel 1956:     my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
                   1957: 						   $env{'user.domain'},
                   1958: 						   $env{'user.name'});
1.221     bowersj2 1959:     $self->{STUDENT_DATA} = \%student_data;
1.133     bowersj2 1960: 
1.221     bowersj2 1961:     $self->{RETRIEVED_USER_DATA} = 1;
1.133     bowersj2 1962: }
                   1963: 
1.354     raeburn  1964: sub get_discussion_data {
                   1965:     my $self = shift;
                   1966:     if ($self->{RETRIEVED_DISCUSSION_DATA}) {
1.366     albertel 1967: 	return $self->{DISCUSSION_DATA};
1.354     raeburn  1968:     }
1.366     albertel 1969: 
                   1970:     $self->generate_email_discuss_status();    
                   1971: 
1.354     raeburn  1972:     my $cid=$env{'request.course.id'};
                   1973:     my $cdom=$env{'course.'.$cid.'.domain'};
                   1974:     my $cnum=$env{'course.'.$cid.'.num'};
                   1975:     # Retrieve discussion data for resources in course
1.367     albertel 1976:     my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
1.366     albertel 1977: 
                   1978: 
1.354     raeburn  1979:     $self->{DISCUSSION_DATA} = \%discussion_data;
                   1980:     $self->{RETRIEVED_DISCUSSION_DATA} = 1;
                   1981:     return $self->{DISCUSSION_DATA};
                   1982: }
                   1983: 
                   1984: 
1.133     bowersj2 1985: # Internal function: Takes a key to look up in the nav hash and implements internal
                   1986: # memory caching of that key.
                   1987: sub navhash {
                   1988:     my $self = shift; my $key = shift;
                   1989:     return $self->{NAV_HASH}->{$key};
                   1990: }
                   1991: 
1.217     bowersj2 1992: =pod
                   1993: 
                   1994: =item * B<courseMapDefined>(): Returns true if the course map is defined, 
                   1995:     false otherwise. Undefined course maps indicate an error somewhere in
                   1996:     LON-CAPA, and you will not be able to proceed with using the navmap.
                   1997:     See the B<NAV> screen for an example of using this.
                   1998: 
                   1999: =cut
                   2000: 
1.133     bowersj2 2001: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   2002: sub courseMapDefined {
                   2003:     my $self = shift;
1.320     albertel 2004:     my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
1.133     bowersj2 2005: 
                   2006:     my $firstres = $self->navhash("map_start_$uri");
                   2007:     my $lastres = $self->navhash("map_finish_$uri");
                   2008:     return $firstres && $lastres;
                   2009: }
                   2010: 
                   2011: sub getIterator {
                   2012:     my $self = shift;
                   2013:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.314     albertel 2014:                                                      shift, undef, shift,
                   2015: 						     shift, shift);
1.133     bowersj2 2016:     return $iterator;
                   2017: }
                   2018: 
                   2019: # Private method: Does the given resource (as a symb string) have
                   2020: # current discussion? Returns 0 if chat/mail data not extracted.
                   2021: sub hasDiscussion {
                   2022:     my $self = shift;
                   2023:     my $symb = shift;
1.221     bowersj2 2024:     $self->generate_email_discuss_status();
                   2025: 
1.133     bowersj2 2026:     if (!defined($self->{DISCUSSION_TIME})) { return 0; }
                   2027: 
                   2028:     #return defined($self->{DISCUSSION_TIME}->{$symb});
1.259     raeburn  2029: 
1.323     albertel 2030:     # backward compatibility (bulletin boards used to be 'wrapped')
                   2031:     my $ressymb = $self->wrap_symb($symb);
1.259     raeburn  2032:     if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
                   2033:         return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
                   2034:     } else {
1.266     raeburn  2035: #        return $self->{DISCUSSION_TIME}->{$ressymb} >  $self->{LAST_CHECK}; # v.1.1 behavior 
                   2036:         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  2037:     }
1.133     bowersj2 2038: }
                   2039: 
1.366     albertel 2040: sub last_post_time {
                   2041:     my $self = shift;
                   2042:     my $symb = shift;
                   2043:     my $ressymb = $self->wrap_symb($symb);
                   2044:     return $self->{DISCUSSION_TIME}->{$ressymb};
                   2045: }
                   2046: 
1.393     raeburn  2047: sub discussion_info {
1.366     albertel 2048:     my $self = shift;
                   2049:     my $symb = shift;
1.393     raeburn  2050:     my $filter = shift;
1.366     albertel 2051: 
                   2052:     $self->get_discussion_data();
1.372     raeburn  2053: 
1.366     albertel 2054:     my $ressymb = $self->wrap_symb($symb);
1.372     raeburn  2055:     # keys used to store bulletinboard postings use 'unwrapped' symb. 
                   2056:     my $discsymb = $self->unwrap_symb($ressymb);
                   2057:     my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
1.366     albertel 2058:     if (!$version) { return; }
                   2059: 
                   2060:     my $prevread = $self->{LAST_READ}{$ressymb};
                   2061: 
1.393     raeburn  2062:     my $count = 0;
1.366     albertel 2063:     my $hiddenflag = 0;
                   2064:     my $deletedflag = 0;
1.393     raeburn  2065:     my ($hidden,$deleted,%info);
1.366     albertel 2066: 
                   2067:     for (my $id=$version; $id>0; $id--) {
1.372     raeburn  2068: 	my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
1.366     albertel 2069: 	my @keys=split(/:/,$vkeys);
                   2070: 	if (grep(/^hidden$/ ,@keys)) {
                   2071: 	    if (!$hiddenflag) {
1.372     raeburn  2072: 		$hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
1.366     albertel 2073: 		$hiddenflag = 1;
                   2074: 	    }
                   2075: 	} elsif (grep(/^deleted$/,@keys)) {
                   2076: 	    if (!$deletedflag) {
1.372     raeburn  2077: 		$deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
1.366     albertel 2078: 		$deletedflag = 1;
                   2079: 	    }
                   2080: 	} else {
1.393     raeburn  2081: 	    if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
                   2082:                 if ($filter eq 'unread') {
                   2083: 		    if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
                   2084:                         next;
                   2085:                     }
                   2086:                 }
                   2087: 		$count++;
                   2088: 		$info{$count}{'subject'} =
                   2089: 		    $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
                   2090:                 $info{$count}{'id'} = $id;
                   2091:                 $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
                   2092:             }
1.366     albertel 2093: 	}
                   2094:     }
                   2095:     if (wantarray) {
1.393     raeburn  2096: 	return ($count,%info);
1.366     albertel 2097:     }
1.393     raeburn  2098:     return $count;
1.366     albertel 2099: }
                   2100: 
1.321     raeburn  2101: sub wrap_symb {
1.322     albertel 2102:     my $self = shift;
1.321     raeburn  2103:     my $symb = shift;
1.373     albertel 2104:     if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
1.322     albertel 2105:         unless ($symb =~ m|adm/wrapper/adm|) {
                   2106:             $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
1.321     raeburn  2107:         }
                   2108:     }
1.322     albertel 2109:     return $symb;
1.321     raeburn  2110: }
                   2111: 
1.372     raeburn  2112: sub unwrap_symb {
                   2113:     my $self = shift;
                   2114:     my $ressymb = shift;
                   2115:     my $discsymb = $ressymb;
1.373     albertel 2116:     if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
1.372     raeburn  2117:          $discsymb = $1.$2;
                   2118:     }
                   2119:     return $discsymb;
                   2120: }
                   2121: 
1.322     albertel 2122: # Private method: Does the given resource (as a symb string) have
                   2123: # current feedback? Returns the string in the feedback hash, which
                   2124: # will be false if it does not exist.
                   2125: 
1.133     bowersj2 2126: sub getFeedback { 
                   2127:     my $self = shift;
                   2128:     my $symb = shift;
1.395   ! raeburn  2129:     my $source = shift;
1.133     bowersj2 2130: 
1.221     bowersj2 2131:     $self->generate_email_discuss_status();
                   2132: 
1.133     bowersj2 2133:     if (!defined($self->{FEEDBACK})) { return ""; }
                   2134:     
1.395   ! raeburn  2135:     my $feedback;
        !          2136:     if ($self->{FEEDBACK}->{$symb}) {
        !          2137:         $feedback = $self->{FEEDBACK}->{$symb};
        !          2138:         if ($self->{FEEDBACK}->{$source}) {
        !          2139:             $feedback .= ','.$self->{FEEDBACK}->{$source};
        !          2140:         }
        !          2141:     } else {
        !          2142:         if ($self->{FEEDBACK}->{$source}) {
        !          2143:             $feedback = $self->{FEEDBACK}->{$source};
        !          2144:         }
        !          2145:     }
        !          2146:     return $feedback;
1.133     bowersj2 2147: }
                   2148: 
                   2149: # Private method: Get the errors for that resource (by source).
                   2150: sub getErrors { 
                   2151:     my $self = shift;
1.395   ! raeburn  2152:     my $symb = shift;
1.133     bowersj2 2153:     my $src = shift;
1.221     bowersj2 2154: 
                   2155:     $self->generate_email_discuss_status();
                   2156: 
1.133     bowersj2 2157:     if (!defined($self->{ERROR_MSG})) { return ""; }
1.395   ! raeburn  2158: 
        !          2159:     my $errors;
        !          2160:     if ($self->{ERROR_MSG}->{$symb}) {
        !          2161:         $errors = $self->{ERROR_MSG}->{$symb};
        !          2162:         if ($self->{ERROR_MSG}->{$src}) {
        !          2163:             $errors .= ','.$self->{ERROR_MSG}->{$src};
        !          2164:         }
        !          2165:     } else {
        !          2166:         if ($self->{ERROR_MSG}->{$src}) {
        !          2167:             $errors = $self->{ERROR_MSG}->{$src};
        !          2168:         }
        !          2169:     }
        !          2170:     return $errors;
1.133     bowersj2 2171: }
                   2172: 
                   2173: =pod
                   2174: 
1.174     albertel 2175: =item * B<getById>(id):
                   2176: 
                   2177: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
                   2178: object for that resource. This method, or other methods that use it
                   2179: (as in the resource object) is the only proper way to obtain a
                   2180: resource object.
1.133     bowersj2 2181: 
1.194     bowersj2 2182: =item * B<getBySymb>(symb):
                   2183: 
                   2184: Based on the symb of the resource, get a resource object for that
                   2185: resource. This is one of the proper ways to get a resource object.
                   2186: 
                   2187: =item * B<getMapByMapPc>(map_pc):
                   2188: 
                   2189: Based on the map_pc of the resource, get a resource object for
                   2190: the given map. This is one of the proper ways to get a resource object.
                   2191: 
1.133     bowersj2 2192: =cut
                   2193: 
                   2194: # The strategy here is to cache the resource objects, and only construct them
                   2195: # as we use them. The real point is to prevent reading any more from the tied
                   2196: # hash then we have to, which should hopefully alleviate speed problems.
                   2197: 
                   2198: sub getById {
                   2199:     my $self = shift;
                   2200:     my $id = shift;
                   2201: 
                   2202:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   2203:     {
                   2204:         return $self->{RESOURCE_CACHE}->{$id};
                   2205:     }
                   2206: 
                   2207:     # resource handles inserting itself into cache.
                   2208:     # Not clear why the quotes are necessary, but as of this
                   2209:     # writing it doesn't work without them.
                   2210:     return "Apache::lonnavmaps::resource"->new($self, $id);
1.132     bowersj2 2211: }
1.133     bowersj2 2212: 
1.172     bowersj2 2213: sub getBySymb {
                   2214:     my $self = shift;
                   2215:     my $symb = shift;
1.277     matthew  2216: 
1.228     albertel 2217:     my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172     bowersj2 2218:     my $map = $self->getResourceByUrl($mapUrl);
1.277     matthew  2219:     my $returnvalue = undef;
                   2220:     if (ref($map)) {
                   2221:         $returnvalue = $self->getById($map->map_pc() .'.'.$id);
                   2222:     }
                   2223:     return $returnvalue;
1.194     bowersj2 2224: }
                   2225: 
                   2226: sub getByMapPc {
                   2227:     my $self = shift;
                   2228:     my $map_pc = shift;
                   2229:     my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
                   2230:     $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
                   2231:     return $self->getById($map_id);
1.172     bowersj2 2232: }
                   2233: 
1.133     bowersj2 2234: =pod
                   2235: 
1.174     albertel 2236: =item * B<firstResource>():
                   2237: 
                   2238: Returns a resource object reference corresponding to the first
                   2239: resource in the navmap.
1.133     bowersj2 2240: 
                   2241: =cut
                   2242: 
                   2243: sub firstResource {
                   2244:     my $self = shift;
                   2245:     my $firstResource = $self->navhash('map_start_' .
1.320     albertel 2246:                      &Apache::lonnet::clutter($env{'request.course.uri'}));
1.133     bowersj2 2247:     return $self->getById($firstResource);
1.132     bowersj2 2248: }
1.133     bowersj2 2249: 
                   2250: =pod
                   2251: 
1.174     albertel 2252: =item * B<finishResource>():
                   2253: 
                   2254: Returns a resource object reference corresponding to the last resource
                   2255: in the navmap.
1.133     bowersj2 2256: 
                   2257: =cut
                   2258: 
                   2259: sub finishResource {
                   2260:     my $self = shift;
                   2261:     my $firstResource = $self->navhash('map_finish_' .
1.320     albertel 2262:                      &Apache::lonnet::clutter($env{'request.course.uri'}));
1.133     bowersj2 2263:     return $self->getById($firstResource);
1.132     bowersj2 2264: }
1.133     bowersj2 2265: 
                   2266: # Parmval reads the parm hash and cascades the lookups. parmval_real does
                   2267: # the actual lookup; parmval caches the results.
                   2268: sub parmval {
                   2269:     my $self = shift;
                   2270:     my ($what,$symb)=@_;
                   2271:     my $hashkey = $what."|||".$symb;
                   2272: 
                   2273:     if (defined($self->{PARM_CACHE}->{$hashkey})) {
                   2274:         return $self->{PARM_CACHE}->{$hashkey};
                   2275:     }
                   2276: 
                   2277:     my $result = $self->parmval_real($what, $symb);
                   2278:     $self->{PARM_CACHE}->{$hashkey} = $result;
                   2279:     return $result;
1.132     bowersj2 2280: }
                   2281: 
1.133     bowersj2 2282: sub parmval_real {
                   2283:     my $self = shift;
1.219     albertel 2284:     my ($what,$symb,$recurse) = @_;
1.133     bowersj2 2285: 
1.221     bowersj2 2286:     # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
                   2287:     $self->generate_course_user_opt();
                   2288: 
1.320     albertel 2289:     my $cid=$env{'request.course.id'};
                   2290:     my $csec=$env{'request.course.sec'};
1.350     raeburn  2291:     my $cgroup='';
                   2292:     my @cgrps=split(/:/,$env{'request.course.groups'});
                   2293:     if (@cgrps > 0) {
                   2294:         @cgrps = sort(@cgrps);
                   2295:         $cgroup = $cgrps[0];
                   2296:     } 
1.320     albertel 2297:     my $uname=$env{'user.name'};
                   2298:     my $udom=$env{'user.domain'};
1.133     bowersj2 2299: 
                   2300:     unless ($symb) { return ''; }
                   2301:     my $result='';
                   2302: 
1.226     www      2303:     my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.383     albertel 2304:     $mapname = &Apache::lonnet::deversion($mapname);
1.133     bowersj2 2305: # ----------------------------------------------------- Cascading lookup scheme
                   2306:     my $rwhat=$what;
                   2307:     $what=~s/^parameter\_//;
                   2308:     $what=~s/\_/\./;
                   2309: 
                   2310:     my $symbparm=$symb.'.'.$what;
                   2311:     my $mapparm=$mapname.'___(all).'.$what;
1.325     albertel 2312:     my $usercourseprefix=$cid;
1.133     bowersj2 2313: 
1.350     raeburn  2314:     my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
                   2315:     my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
                   2316:     my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
                   2317: 
1.133     bowersj2 2318:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   2319:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   2320:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   2321: 
                   2322:     my $courselevel= $usercourseprefix.'.'.$what;
                   2323:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   2324:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   2325: 
                   2326:     my $useropt = $self->{USER_OPT};
                   2327:     my $courseopt = $self->{COURSE_OPT};
                   2328:     my $parmhash = $self->{PARM_HASH};
                   2329: 
                   2330: # ---------------------------------------------------------- first, check user
                   2331:     if ($uname and defined($useropt)) {
                   2332:         if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
                   2333:         if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
                   2334:         if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
                   2335:     }
                   2336: 
                   2337: # ------------------------------------------------------- second, check course
1.350     raeburn  2338:     if ($cgroup ne '' and defined($courseopt)) {
                   2339:         if (defined($$courseopt{$grplevelr})) { return $$courseopt{$grplevelr}; }
                   2340:         if (defined($$courseopt{$grplevelm})) { return $$courseopt{$grplevelm}; }
                   2341:         if (defined($$courseopt{$grplevel})) { return $$courseopt{$grplevel}; }
                   2342:     }
                   2343: 
1.133     bowersj2 2344:     if ($csec and defined($courseopt)) {
                   2345:         if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
                   2346:         if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
                   2347:         if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
                   2348:     }
                   2349: 
                   2350:     if (defined($courseopt)) {
                   2351:         if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
                   2352:     }
                   2353: 
                   2354: # ----------------------------------------------------- third, check map parms
                   2355: 
                   2356:     my $thisparm=$$parmhash{$symbparm};
                   2357:     if (defined($thisparm)) { return $thisparm; }
                   2358: 
                   2359: # ----------------------------------------------------- fourth , check default
                   2360: 
1.246     albertel 2361:     my $meta_rwhat=$rwhat;
                   2362:     $meta_rwhat=~s/\./_/g;
                   2363:     my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
                   2364:     if (defined($default)) { return $default}
                   2365:     $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.133     bowersj2 2366:     if (defined($default)) { return $default}
                   2367: 
1.315     albertel 2368: # --------------------------------------------------- fifth, check more course
                   2369:     if (defined($courseopt)) {
                   2370:         if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
                   2371:         if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
                   2372:     }
                   2373: 
                   2374: # --------------------------------------------------- sixth , cascade up parts
1.133     bowersj2 2375: 
                   2376:     my ($space,@qualifier)=split(/\./,$rwhat);
                   2377:     my $qualifier=join('.',@qualifier);
                   2378:     unless ($space eq '0') {
1.160     albertel 2379: 	my @parts=split(/_/,$space);
                   2380: 	my $id=pop(@parts);
                   2381: 	my $part=join('_',@parts);
                   2382: 	if ($part eq '') { $part='0'; }
1.219     albertel 2383: 	my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
1.160     albertel 2384: 	if (defined($partgeneral)) { return $partgeneral; }
1.133     bowersj2 2385:     }
1.219     albertel 2386:     if ($recurse) { return undef; }
                   2387:     my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
                   2388:     if (defined($pack_def)) { return $pack_def; }
1.133     bowersj2 2389:     return '';
1.145     bowersj2 2390: }
                   2391: 
1.174     albertel 2392: =pod
1.145     bowersj2 2393: 
1.352     raeburn  2394: =item * B<getResourceByUrl>(url,multiple):
1.145     bowersj2 2395: 
1.352     raeburn  2396: Retrieves a resource object by URL of the resource, unless the optional
                   2397: multiple parameter is included in wahich caes an array of resource 
                   2398: objects is returned. If passed a resource object, it will simply return  
                   2399: it, so it is safe to use this method in code like
                   2400: "$res = $navmap->getResourceByUrl($res)"
                   2401: if you're not sure if $res is already an object, or just a URL. If the
                   2402: resource appears multiple times in the course, only the first instance 
                   2403: will be returned (useful for maps), unless the multiple parameter has
                   2404: been included, in which case all instances are returned in an array.
1.174     albertel 2405: 
1.314     albertel 2406: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
1.174     albertel 2407: 
                   2408: The map is a specification of a map to retreive the resources from,
                   2409: either as a url or as an object. The filterFunc is a reference to a
                   2410: function that takes a resource object as its one argument and returns
                   2411: true if the resource should be included, or false if it should not
                   2412: be. If recursive is true, the map will be recursively examined,
                   2413: otherwise it will not be. If bailout is true, the function will return
1.314     albertel 2414: as soon as it finds a resource, if false it will finish. If showall is
                   2415: true it will not hide maps that contain nothing but one other map. By
                   2416: default, the map is the top-level map of the course, filterFunc is a
                   2417: function that always returns 1, recursive is true, bailout is false,
                   2418: showall is false. The resources will be returned in a list containing
                   2419: the resource objects for the corresponding resources, with B<no
                   2420: structure information> in the list; regardless of branching,
                   2421: recursion, etc., it will be a flat list.
1.174     albertel 2422: 
                   2423: Thus, this is suitable for cases where you don't want the structure,
                   2424: just a list of all resources. It is also suitable for finding out how
                   2425: many resources match a given description; for this use, if all you
                   2426: want to know is if I<any> resources match the description, the bailout
                   2427: parameter will allow you to avoid potentially expensive enumeration of
                   2428: all matching resources.
1.145     bowersj2 2429: 
1.318     albertel 2430: =item * B<hasResource>(map, filterFunc, recursive, showall):
1.145     bowersj2 2431: 
1.174     albertel 2432: Convience method for
1.146     bowersj2 2433: 
1.318     albertel 2434:  scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
1.146     bowersj2 2435: 
1.174     albertel 2436: which will tell whether the map has resources matching the description
                   2437: in the filter function.
1.146     bowersj2 2438: 
1.352     raeburn  2439: =item * B<usedVersion>(url):
                   2440: 
                   2441: Retrieves version infomation for a url. Returns the version (a number, or 
                   2442: the string "mostrecent") for resources which have version information in  
                   2443: the big hash.
                   2444:     
1.145     bowersj2 2445: =cut
                   2446: 
1.277     matthew  2447: 
1.145     bowersj2 2448: sub getResourceByUrl {
                   2449:     my $self = shift;
                   2450:     my $resUrl = shift;
1.352     raeburn  2451:     my $multiple = shift;
1.145     bowersj2 2452: 
                   2453:     if (ref($resUrl)) { return $resUrl; }
                   2454: 
                   2455:     $resUrl = &Apache::lonnet::clutter($resUrl);
                   2456:     my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1.352     raeburn  2457:     if (!$resId) { return ''; }
                   2458:     if ($multiple) {
                   2459:         my @resources = ();
                   2460:         my @resIds = split (/,/, $resId);
                   2461:         foreach my $id (@resIds) {
1.353     raeburn  2462:             my $resourceId = $self->getById($id);
                   2463:             if ($resourceId) { 
                   2464:                 push(@resources,$resourceId);
1.352     raeburn  2465:             }
                   2466:         }
                   2467:         return @resources;
                   2468:     } else {
                   2469:         if ($resId =~ /,/) {
                   2470:             $resId = (split (/,/, $resId))[0];
                   2471:         }
                   2472:         return $self->getById($resId);
1.145     bowersj2 2473:     }
                   2474: }
                   2475: 
                   2476: sub retrieveResources {
                   2477:     my $self = shift;
                   2478:     my $map = shift;
                   2479:     my $filterFunc = shift;
                   2480:     if (!defined ($filterFunc)) {
                   2481:         $filterFunc = sub {return 1;};
                   2482:     }
                   2483:     my $recursive = shift;
                   2484:     if (!defined($recursive)) { $recursive = 1; }
                   2485:     my $bailout = shift;
                   2486:     if (!defined($bailout)) { $bailout = 0; }
1.314     albertel 2487:     my $showall = shift;
1.145     bowersj2 2488:     # Create the necessary iterator.
                   2489:     if (!ref($map)) { # assume it's a url of a map.
1.172     bowersj2 2490:         $map = $self->getResourceByUrl($map);
1.145     bowersj2 2491:     }
                   2492: 
1.213     bowersj2 2493:     # If nothing was passed, assume top-level map
                   2494:     if (!$map) {
                   2495: 	$map = $self->getById('0.0');
                   2496:     }
                   2497: 
1.145     bowersj2 2498:     # Check the map's validity.
1.213     bowersj2 2499:     if (!$map->is_map()) {
1.145     bowersj2 2500:         # Oh, to throw an exception.... how I'd love that!
                   2501:         return ();
                   2502:     }
                   2503: 
1.146     bowersj2 2504:     # Get an iterator.
                   2505:     my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.314     albertel 2506:                                 undef, $recursive, $showall);
1.146     bowersj2 2507: 
                   2508:     my @resources = ();
                   2509: 
                   2510:     # Run down the iterator and collect the resources.
1.222     bowersj2 2511:     my $curRes;
                   2512: 
                   2513:     while ($curRes = $it->next()) {
1.146     bowersj2 2514:         if (ref($curRes)) {
                   2515:             if (!&$filterFunc($curRes)) {
                   2516:                 next;
                   2517:             }
                   2518: 
                   2519:             push @resources, $curRes;
                   2520: 
                   2521:             if ($bailout) {
                   2522:                 return @resources;
                   2523:             }
                   2524:         }
                   2525: 
                   2526:     }
                   2527: 
                   2528:     return @resources;
                   2529: }
                   2530: 
                   2531: sub hasResource {
                   2532:     my $self = shift;
                   2533:     my $map = shift;
                   2534:     my $filterFunc = shift;
                   2535:     my $recursive = shift;
1.318     albertel 2536:     my $showall = shift;
1.146     bowersj2 2537:     
1.318     albertel 2538:     return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
1.133     bowersj2 2539: }
1.51      bowersj2 2540: 
1.352     raeburn  2541: sub usedVersion {
                   2542:     my $self = shift;
                   2543:     my $linkurl = shift;
                   2544:     return $self->navhash("version_$linkurl");
                   2545: }
                   2546: 
1.51      bowersj2 2547: 1;
                   2548: 
                   2549: package Apache::lonnavmaps::iterator;
1.365     albertel 2550: use Scalar::Util qw(weaken);
1.320     albertel 2551: use Apache::lonnet;
                   2552: 
1.51      bowersj2 2553: =pod
                   2554: 
                   2555: =back
                   2556: 
1.174     albertel 2557: =head1 Object: navmap Iterator
1.51      bowersj2 2558: 
1.174     albertel 2559: An I<iterator> encapsulates the logic required to traverse a data
                   2560: structure. navmap uses an iterator to traverse the course map
                   2561: according to the criteria you wish to use.
                   2562: 
                   2563: To obtain an iterator, call the B<getIterator>() function of a
                   2564: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
                   2565: directly.) This will return a reference to the iterator:
1.51      bowersj2 2566: 
                   2567: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   2568: 
                   2569: To get the next thing from the iterator, call B<next>:
                   2570: 
                   2571: C<my $nextThing = $resourceIterator-E<gt>next()>
                   2572: 
                   2573: getIterator behaves as follows:
                   2574: 
                   2575: =over 4
                   2576: 
1.174     albertel 2577: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
                   2578: 
                   2579: All parameters are optional. firstResource is a resource reference
                   2580: corresponding to where the iterator should start. It defaults to
                   2581: navmap->firstResource() for the corresponding nav map. finishResource
                   2582: corresponds to where you want the iterator to end, defaulting to
                   2583: navmap->finishResource(). filterHash is a hash used as a set
                   2584: containing strings representing the resource IDs, defaulting to
                   2585: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205     bowersj2 2586: hash: If a 0, then only resources that exist IN the filterHash will be
1.174     albertel 2587: recursed on. If it is a 1, only resources NOT in the filterHash will
                   2588: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
                   2589: false (default), the iterator will only return the first level of map
                   2590: that is not just a single, 'redirecting' map. If true, the iterator
                   2591: will return all information, starting with the top-level map,
                   2592: regardless of content. returnTopMap, if true (default false), will
                   2593: cause the iterator to return the top-level map object (resource 0.0)
                   2594: before anything else.
                   2595: 
                   2596: Thus, by default, only top-level resources will be shown. Change the
                   2597: condition to a 1 without changing the hash, and all resources will be
                   2598: shown. Changing the condition to 1 and including some values in the
                   2599: hash will allow you to selectively suppress parts of the navmap, while
                   2600: leaving it on 0 and adding things to the hash will allow you to
                   2601: selectively add parts of the nav map. See the handler code for
                   2602: examples.
                   2603: 
                   2604: The iterator will return either a reference to a resource object, or a
                   2605: token representing something in the map, such as the beginning of a
                   2606: new branch. The possible tokens are:
                   2607: 
                   2608: =over 4
1.51      bowersj2 2609: 
1.222     bowersj2 2610: =item * B<END_ITERATOR>:
                   2611: 
                   2612: The iterator has returned all that it's going to. Further calls to the
                   2613: iterator will just produce more of these. This is a "false" value, and
                   2614: is the only false value the iterator which will be returned, so it can
                   2615: be used as a loop sentinel.
                   2616: 
1.217     bowersj2 2617: =item * B<BEGIN_MAP>:
1.51      bowersj2 2618: 
1.174     albertel 2619: A new map is being recursed into. This is returned I<after> the map
                   2620: resource itself is returned.
1.51      bowersj2 2621: 
1.217     bowersj2 2622: =item * B<END_MAP>:
1.174     albertel 2623: 
                   2624: The map is now done.
1.51      bowersj2 2625: 
1.217     bowersj2 2626: =item * B<BEGIN_BRANCH>:
1.70      bowersj2 2627: 
1.174     albertel 2628: A branch is now starting. The next resource returned will be the first
                   2629: in that branch.
1.70      bowersj2 2630: 
1.217     bowersj2 2631: =item * B<END_BRANCH>:
1.70      bowersj2 2632: 
1.174     albertel 2633: The branch is now done.
1.51      bowersj2 2634: 
                   2635: =back
                   2636: 
1.174     albertel 2637: The tokens are retreivable via methods on the iterator object, i.e.,
                   2638: $iterator->END_MAP.
1.70      bowersj2 2639: 
1.174     albertel 2640: Maps can contain empty resources. The iterator will automatically skip
                   2641: over such resources, but will still treat the structure
                   2642: correctly. Thus, a complicated map with several branches, but
                   2643: consisting entirely of empty resources except for one beginning or
                   2644: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
                   2645: but only one resource will be returned.
1.116     bowersj2 2646: 
1.242     matthew  2647: =back
                   2648: 
1.222     bowersj2 2649: =head2 Normal Usage
                   2650: 
                   2651: Normal usage of the iterator object is to do the following:
                   2652: 
                   2653:  my $it = $navmap->getIterator([your params here]);
                   2654:  my $curRes;
                   2655:  while ($curRes = $it->next()) {
                   2656:    [your logic here]
                   2657:  }
                   2658: 
                   2659: Note that inside of the loop, it's frequently useful to check if
                   2660: "$curRes" is a reference or not with the reference function; only
                   2661: resource objects will be references, and any non-references will 
                   2662: be the tokens described above.
                   2663: 
                   2664: Also note there is some old code floating around that trys to track
                   2665: the depth of the iterator to see when it's done; do not copy that 
                   2666: code. It is difficult to get right and harder to understand then
                   2667: this. They should be migrated to this new style.
1.51      bowersj2 2668: 
                   2669: =cut
                   2670: 
                   2671: # Here are the tokens for the iterator:
                   2672: 
1.222     bowersj2 2673: sub END_ITERATOR { return 0; }
1.51      bowersj2 2674: sub BEGIN_MAP { return 1; }    # begining of a new map
                   2675: sub END_MAP { return 2; }      # end of the map
                   2676: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   2677: sub END_BRANCH { return 4; }   # end of a branch
1.89      bowersj2 2678: sub FORWARD { return 1; }      # go forward
                   2679: sub BACKWARD { return 2; }
1.51      bowersj2 2680: 
1.96      bowersj2 2681: sub min {
                   2682:     (my $a, my $b) = @_;
                   2683:     if ($a < $b) { return $a; } else { return $b; }
                   2684: }
                   2685: 
1.94      bowersj2 2686: sub new {
                   2687:     # magic invocation to create a class instance
                   2688:     my $proto = shift;
                   2689:     my $class = ref($proto) || $proto;
                   2690:     my $self = {};
                   2691: 
1.300     albertel 2692:     weaken($self->{NAV_MAP} = shift);
1.94      bowersj2 2693:     return undef unless ($self->{NAV_MAP});
                   2694: 
                   2695:     # Handle the parameters
                   2696:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   2697:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   2698: 
                   2699:     # If the given resources are just the ID of the resource, get the
                   2700:     # objects
                   2701:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   2702:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   2703:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   2704:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   2705: 
                   2706:     $self->{FILTER} = shift;
                   2707: 
                   2708:     # A hash, used as a set, of resource already seen
                   2709:     $self->{ALREADY_SEEN} = shift;
                   2710:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   2711:     $self->{CONDITION} = shift;
                   2712: 
1.116     bowersj2 2713:     # Do we want to automatically follow "redirection" maps?
                   2714:     $self->{FORCE_TOP} = shift;
                   2715: 
1.162     bowersj2 2716:     # Do we want to return the top-level map object (resource 0.0)?
                   2717:     $self->{RETURN_0} = shift;
                   2718:     # have we done that yet?
                   2719:     $self->{HAVE_RETURNED_0} = 0;
                   2720: 
1.94      bowersj2 2721:     # Now, we need to pre-process the map, by walking forward and backward
                   2722:     # over the parts of the map we're going to look at.
1.96      bowersj2 2723: 
1.97      bowersj2 2724:     # The processing steps are exactly the same, except for a few small 
                   2725:     # changes, so I bundle those up in the following list of two elements:
                   2726:     # (direction_to_iterate, VAL_name, next_resource_method_to_call,
                   2727:     # first_resource).
                   2728:     # This prevents writing nearly-identical code twice.
                   2729:     my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                   2730:                         'FIRST_RESOURCE'],
                   2731:                        [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                   2732:                         'FINISH_RESOURCE'] );
                   2733: 
1.98      bowersj2 2734:     my $maxDepth = 0; # tracks max depth
                   2735: 
1.116     bowersj2 2736:     # If there is only one resource in this map, and it's a map, we
                   2737:     # want to remember that, so the user can ask for the first map
                   2738:     # that isn't just a redirector.
                   2739:     my $resource; my $resourceCount = 0;
                   2740: 
1.209     bowersj2 2741:     # Documentation on this algorithm can be found in the CVS repository at 
                   2742:     # /docs/lonnavdocs; these "**#**" markers correspond to documentation
                   2743:     # in that file.
1.107     bowersj2 2744:     # **1**
                   2745: 
1.97      bowersj2 2746:     foreach my $pass (@iterations) {
                   2747:         my $direction = $pass->[0];
                   2748:         my $valName = $pass->[1];
                   2749:         my $nextResourceMethod = $pass->[2];
                   2750:         my $firstResourceName = $pass->[3];
                   2751: 
                   2752:         my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                   2753:                                                             $self->{FIRST_RESOURCE},
                   2754:                                                             $self->{FINISH_RESOURCE},
                   2755:                                                             {}, undef, 0, $direction);
1.96      bowersj2 2756:     
1.97      bowersj2 2757:         # prime the recursion
                   2758:         $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222     bowersj2 2759: 	$iterator->next();
1.97      bowersj2 2760:         my $curRes = $iterator->next();
1.222     bowersj2 2761: 	my $depth = 1;
                   2762:         while ($depth > 0) {
                   2763: 	    if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
                   2764: 	    if ($curRes == $iterator->END_MAP()) { $depth--; }
                   2765: 
1.97      bowersj2 2766:             if (ref($curRes)) {
1.116     bowersj2 2767:                 # If there's only one resource, this will save it
1.117     bowersj2 2768:                 # we have to filter empty resources from consideration here,
                   2769:                 # or even "empty", redirecting maps have two (start & finish)
                   2770:                 # or three (start, finish, plus redirector)
                   2771:                 if($direction == FORWARD && $curRes->src()) { 
                   2772:                     $resource = $curRes; $resourceCount++; 
                   2773:                 }
1.97      bowersj2 2774:                 my $resultingVal = $curRes->{DATA}->{$valName};
                   2775:                 my $nextResources = $curRes->$nextResourceMethod();
1.116     bowersj2 2776:                 my $nextCount = scalar(@{$nextResources});
1.104     bowersj2 2777: 
1.116     bowersj2 2778:                 if ($nextCount == 1) { # **3**
1.97      bowersj2 2779:                     my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                   2780:                     $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   2781:                 }
                   2782:                 
1.116     bowersj2 2783:                 if ($nextCount > 1) { # **4**
1.97      bowersj2 2784:                     foreach my $res (@{$nextResources}) {
                   2785:                         my $current = $res->{DATA}->{$valName} || 999999999;
                   2786:                         $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                   2787:                     }
                   2788:                 }
                   2789:             }
1.96      bowersj2 2790:             
1.107     bowersj2 2791:             # Assign the final val (**2**)
1.97      bowersj2 2792:             if (ref($curRes) && $direction == BACKWARD()) {
1.98      bowersj2 2793:                 my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
                   2794:                                      $curRes->{DATA}->{BOT_UP_VAL});
                   2795:                 
                   2796:                 $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                   2797:                 if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190     bowersj2 2798:             }
1.222     bowersj2 2799: 
                   2800: 	    $curRes = $iterator->next();
1.96      bowersj2 2801:         }
                   2802:     }
1.94      bowersj2 2803: 
1.116     bowersj2 2804:     # Check: Was this only one resource, a map?
1.255     albertel 2805:     if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) { 
1.116     bowersj2 2806:         my $firstResource = $resource->map_start();
                   2807:         my $finishResource = $resource->map_finish();
                   2808:         return 
                   2809:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   2810:                                               $finishResource, $self->{FILTER},
                   2811:                                               $self->{ALREADY_SEEN}, 
1.314     albertel 2812:                                               $self->{CONDITION},
                   2813: 					      $self->{FORCE_TOP});
1.116     bowersj2 2814:         
                   2815:     }
                   2816: 
1.98      bowersj2 2817:     # Set up some bookkeeping information.
                   2818:     $self->{CURRENT_DEPTH} = 0;
                   2819:     $self->{MAX_DEPTH} = $maxDepth;
                   2820:     $self->{STACK} = [];
                   2821:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222     bowersj2 2822:     $self->{FINISHED} = 0; # When true, the iterator has finished
1.98      bowersj2 2823: 
                   2824:     for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
                   2825:         push @{$self->{STACK}}, [];
                   2826:     }
                   2827: 
1.107     bowersj2 2828:     # Prime the recursion w/ the first resource **5**
1.98      bowersj2 2829:     push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
                   2830:     $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
                   2831: 
                   2832:     bless ($self);
                   2833: 
                   2834:     return $self;
                   2835: }
                   2836: 
                   2837: sub next {
                   2838:     my $self = shift;
1.256     albertel 2839:     my $closeAllPages=shift;
1.222     bowersj2 2840:     if ($self->{FINISHED}) {
                   2841: 	return END_ITERATOR();
                   2842:     }
                   2843: 
1.162     bowersj2 2844:     # If we want to return the top-level map object, and haven't yet,
                   2845:     # do so.
                   2846:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
                   2847:         $self->{HAVE_RETURNED_0} = 1;
                   2848:         return $self->{NAV_MAP}->getById('0.0');
                   2849:     }
1.98      bowersj2 2850: 
                   2851:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   2852:         # grab the next from the recursive iterator 
1.256     albertel 2853:         my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
1.98      bowersj2 2854: 
                   2855:         # is it a begin or end map? If so, update the depth
                   2856:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   2857:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   2858: 
                   2859:         # Are we back at depth 0? If so, stop recursing
                   2860:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   2861:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   2862:         }
                   2863: 
                   2864:         return $next;
                   2865:     }
                   2866: 
                   2867:     if (defined($self->{FORCE_NEXT})) {
                   2868:         my $tmp = $self->{FORCE_NEXT};
                   2869:         $self->{FORCE_NEXT} = undef;
                   2870:         return $tmp;
                   2871:     }
                   2872: 
                   2873:     # Have we not yet begun? If not, return BEGIN_MAP and
                   2874:     # remember we've started.
                   2875:     if ( !$self->{STARTED} ) { 
                   2876:         $self->{STARTED} = 1;
                   2877:         return $self->BEGIN_MAP();
                   2878:     }
                   2879: 
                   2880:     # Here's the guts of the iterator.
                   2881:     
                   2882:     # Find the next resource, if any.
                   2883:     my $found = 0;
                   2884:     my $i = $self->{MAX_DEPTH};
                   2885:     my $newDepth;
                   2886:     my $here;
                   2887:     while ( $i >= 0 && !$found ) {
1.107     bowersj2 2888:         if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
                   2889:             $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98      bowersj2 2890:             $found = 1;
                   2891:             $newDepth = $i;
                   2892:         }
                   2893:         $i--;
                   2894:     }
                   2895: 
                   2896:     # If we still didn't find anything, we're done.
                   2897:     if ( !$found ) {
                   2898:         # We need to get back down to the correct branch depth
                   2899:         if ( $self->{CURRENT_DEPTH} > 0 ) {
                   2900:             $self->{CURRENT_DEPTH}--;
                   2901:             return END_BRANCH();
                   2902:         } else {
1.222     bowersj2 2903: 	    $self->{FINISHED} = 1;
1.98      bowersj2 2904:             return END_MAP();
                   2905:         }
                   2906:     }
                   2907: 
1.104     bowersj2 2908:     # If this is not a resource, it must be an END_BRANCH marker we want
                   2909:     # to return directly.
1.107     bowersj2 2910:     if (!ref($here)) { # **8**
1.104     bowersj2 2911:         if ($here == END_BRANCH()) { # paranoia, in case of later extension
                   2912:             $self->{CURRENT_DEPTH}--;
                   2913:             return $here;
                   2914:         }
                   2915:     }
                   2916: 
                   2917:     # Otherwise, it is a resource and it's safe to store in $self->{HERE}
                   2918:     $self->{HERE} = $here;
                   2919: 
1.98      bowersj2 2920:     # Get to the right level
                   2921:     if ( $self->{CURRENT_DEPTH} > $newDepth ) {
                   2922:         push @{$self->{STACK}->[$newDepth]}, $here;
                   2923:         $self->{CURRENT_DEPTH}--;
                   2924:         return END_BRANCH();
                   2925:     }
                   2926:     if ( $self->{CURRENT_DEPTH} < $newDepth) {
                   2927:         push @{$self->{STACK}->[$newDepth]}, $here;
                   2928:         $self->{CURRENT_DEPTH}++;
                   2929:         return BEGIN_BRANCH();
                   2930:     }
                   2931: 
                   2932:     # If we made it here, we have the next resource, and we're at the
                   2933:     # right branch level. So let's examine the resource for where
                   2934:     # we can get to from here.
                   2935: 
                   2936:     # So we need to look at all the resources we can get to from here,
                   2937:     # categorize them if we haven't seen them, remember if we have a new
                   2938:     my $nextUnfiltered = $here->getNext();
1.104     bowersj2 2939:     my $maxDepthAdded = -1;
                   2940:     
1.98      bowersj2 2941:     for (@$nextUnfiltered) {
                   2942:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104     bowersj2 2943:             my $depth = $_->{DATA}->{DISPLAY_DEPTH};
                   2944:             push @{$self->{STACK}->[$depth]}, $_;
1.98      bowersj2 2945:             $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104     bowersj2 2946:             if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98      bowersj2 2947:         }
                   2948:     }
1.104     bowersj2 2949: 
                   2950:     # Is this the end of a branch? If so, all of the resources examined above
                   2951:     # led to lower levels then the one we are currently at, so we push a END_BRANCH
                   2952:     # marker onto the stack so we don't forget.
                   2953:     # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
                   2954:     # BC branch and gets to C, it will see F as the only next resource, but it's
                   2955:     # one level lower. Thus, this is the end of the branch, since there are no
                   2956:     # more resources added to this level or above.
1.111     bowersj2 2957:     # We don't do this if the examined resource is the finish resource,
                   2958:     # because the condition given above is true, but the "END_MAP" will
                   2959:     # take care of things and we should already be at depth 0.
1.104     bowersj2 2960:     my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111     bowersj2 2961:     if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104     bowersj2 2962:         push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
                   2963:     }
                   2964: 
1.98      bowersj2 2965:     # That ends the main iterator logic. Now, do we want to recurse
                   2966:     # down this map (if this resource is a map)?
1.256     albertel 2967:     if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
1.98      bowersj2 2968:         (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
                   2969:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   2970:         my $firstResource = $self->{HERE}->map_start();
                   2971:         my $finishResource = $self->{HERE}->map_finish();
                   2972: 
                   2973:         $self->{RECURSIVE_ITERATOR} = 
                   2974:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   2975:                                               $finishResource, $self->{FILTER},
1.314     albertel 2976:                                               $self->{ALREADY_SEEN},
                   2977: 					      $self->{CONDITION},
                   2978: 					      $self->{FORCE_TOP});
1.98      bowersj2 2979:     }
                   2980: 
1.116     bowersj2 2981:     # If this is a blank resource, don't actually return it.
1.117     bowersj2 2982:     # Should you ever find you need it, make sure to add an option to the code
                   2983:     #  that you can use; other things depend on this behavior.
1.138     bowersj2 2984:     my $browsePriv = $self->{HERE}->browsePriv();
                   2985:     if (!$self->{HERE}->src() || 
                   2986:         (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.256     albertel 2987:         return $self->next($closeAllPages);
1.116     bowersj2 2988:     }
                   2989: 
1.98      bowersj2 2990:     return $self->{HERE};
                   2991: 
                   2992: }
                   2993: 
                   2994: =pod
                   2995: 
1.174     albertel 2996: The other method available on the iterator is B<getStack>, which
                   2997: returns an array populated with the current 'stack' of maps, as
                   2998: references to the resource objects. Example: This is useful when
                   2999: making the navigation map, as we need to check whether we are under a
                   3000: page map to see if we need to link directly to the resource, or to the
                   3001: page. The first elements in the array will correspond to the top of
                   3002: the stack (most inclusive map).
1.98      bowersj2 3003: 
                   3004: =cut
                   3005: 
                   3006: sub getStack {
                   3007:     my $self=shift;
                   3008: 
                   3009:     my @stack;
                   3010: 
                   3011:     $self->populateStack(\@stack);
                   3012: 
                   3013:     return \@stack;
                   3014: }
                   3015: 
                   3016: # Private method: Calls the iterators recursively to populate the stack.
                   3017: sub populateStack {
                   3018:     my $self=shift;
                   3019:     my $stack = shift;
                   3020: 
                   3021:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3022: 
                   3023:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3024:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3025:     }
1.94      bowersj2 3026: }
                   3027: 
                   3028: 1;
                   3029: 
                   3030: package Apache::lonnavmaps::DFSiterator;
1.365     albertel 3031: use Scalar::Util qw(weaken);
1.320     albertel 3032: use Apache::lonnet;
                   3033: 
1.100     bowersj2 3034: # Not documented in the perldoc: This is a simple iterator that just walks
                   3035: #  through the nav map and presents the resources in a depth-first search
                   3036: #  fashion, ignorant of conditionals, randomized resources, etc. It presents
                   3037: #  BEGIN_MAP and END_MAP, but does not understand branches at all. It is
                   3038: #  useful for pre-processing of some kind, and is in fact used by the main
                   3039: #  iterator that way, but that's about it.
                   3040: # One could imagine merging this into the init routine of the main iterator,
1.251     www      3041: #  but this might as well be left separate, since it is possible some other
1.100     bowersj2 3042: #  use might be found for it. - Jeremy
1.94      bowersj2 3043: 
1.117     bowersj2 3044: # Unlike the main iterator, this DOES return all resources, even blank ones.
                   3045: #  The main iterator needs them to correctly preprocess the map.
                   3046: 
1.94      bowersj2 3047: sub BEGIN_MAP { return 1; }    # begining of a new map
                   3048: sub END_MAP { return 2; }      # end of the map
                   3049: sub FORWARD { return 1; }      # go forward
                   3050: sub BACKWARD { return 2; }
                   3051: 
1.100     bowersj2 3052: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
                   3053: #         filter hash ref (or undef), already seen hash or undef, condition
                   3054: #         (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51      bowersj2 3055: sub new {
                   3056:     # magic invocation to create a class instance
                   3057:     my $proto = shift;
                   3058:     my $class = ref($proto) || $proto;
                   3059:     my $self = {};
                   3060: 
1.300     albertel 3061:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3062:     return undef unless ($self->{NAV_MAP});
                   3063: 
                   3064:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   3065:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   3066: 
                   3067:     # If the given resources are just the ID of the resource, get the
                   3068:     # objects
                   3069:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   3070:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   3071:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   3072:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   3073: 
                   3074:     $self->{FILTER} = shift;
                   3075: 
                   3076:     # A hash, used as a set, of resource already seen
                   3077:     $self->{ALREADY_SEEN} = shift;
1.140     bowersj2 3078:      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63      bowersj2 3079:     $self->{CONDITION} = shift;
1.89      bowersj2 3080:     $self->{DIRECTION} = shift || FORWARD();
1.51      bowersj2 3081: 
1.100     bowersj2 3082:     # Flag: Have we started yet?
1.51      bowersj2 3083:     $self->{STARTED} = 0;
                   3084: 
                   3085:     # Should we continue calling the recursive iterator, if any?
                   3086:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3087:     # The recursive iterator, if any
                   3088:     $self->{RECURSIVE_ITERATOR} = undef;
                   3089:     # Are we recursing on a map, or a branch?
                   3090:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   3091:     # And the count of how deep it is, so that this iterator can keep track of
                   3092:     # when to pick back up again.
                   3093:     $self->{RECURSIVE_DEPTH} = 0;
                   3094: 
                   3095:     # For keeping track of our branches, we maintain our own stack
1.100     bowersj2 3096:     $self->{STACK} = [];
1.51      bowersj2 3097: 
                   3098:     # Start with the first resource
1.89      bowersj2 3099:     if ($self->{DIRECTION} == FORWARD) {
1.100     bowersj2 3100:         push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89      bowersj2 3101:     } else {
1.100     bowersj2 3102:         push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89      bowersj2 3103:     }
1.51      bowersj2 3104: 
                   3105:     bless($self);
                   3106:     return $self;
                   3107: }
                   3108: 
                   3109: sub next {
                   3110:     my $self = shift;
                   3111:     
                   3112:     # Are we using a recursive iterator? If so, pull from that and
                   3113:     # watch the depth; we want to resume our level at the correct time.
1.98      bowersj2 3114:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51      bowersj2 3115:         # grab the next from the recursive iterator
                   3116:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   3117:         
                   3118:         # is it a begin or end map? Update depth if so
                   3119:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3120:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3121: 
                   3122:         # Are we back at depth 0? If so, stop recursing.
                   3123:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3124:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3125:         }
                   3126:         
                   3127:         return $next;
                   3128:     }
                   3129: 
                   3130:     # Is there a current resource to grab? If not, then return
1.100     bowersj2 3131:     # END_MAP, which will end the iterator.
                   3132:     if (scalar(@{$self->{STACK}}) == 0) {
                   3133:         return $self->END_MAP();
1.51      bowersj2 3134:     }
                   3135: 
                   3136:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   3137:     # remember that we've started.
                   3138:     if ( !$self->{STARTED} ) {
                   3139:         $self->{STARTED} = 1;
                   3140:         return $self->BEGIN_MAP;
                   3141:     }
                   3142: 
                   3143:     # Get the next resource in the branch
1.100     bowersj2 3144:     $self->{HERE} = pop @{$self->{STACK}};
1.52      bowersj2 3145: 
1.100     bowersj2 3146:     # remember that we've seen this, so we don't return it again later
1.51      bowersj2 3147:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   3148:     
                   3149:     # Get the next possible resources
1.90      bowersj2 3150:     my $nextUnfiltered;
1.89      bowersj2 3151:     if ($self->{DIRECTION} == FORWARD()) {
1.90      bowersj2 3152:         $nextUnfiltered = $self->{HERE}->getNext();
1.89      bowersj2 3153:     } else {
1.90      bowersj2 3154:         $nextUnfiltered = $self->{HERE}->getPrevious();
1.89      bowersj2 3155:     }
1.51      bowersj2 3156:     my $next = [];
                   3157: 
                   3158:     # filter the next possibilities to remove things we've 
1.100     bowersj2 3159:     # already seen.
1.394     raeburn  3160:     foreach my $item (@$nextUnfiltered) {
                   3161:         if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
                   3162:             push @$next, $item;
1.52      bowersj2 3163:         }
1.51      bowersj2 3164:     }
                   3165: 
                   3166:     while (@$next) {
1.100     bowersj2 3167:         # copy the next possibilities over to the stack
                   3168:         push @{$self->{STACK}}, shift @$next;
1.51      bowersj2 3169:     }
                   3170: 
                   3171:     # If this is a map and we want to recurse down it... (not filtered out)
1.70      bowersj2 3172:     if ($self->{HERE}->is_map() && 
1.63      bowersj2 3173:          (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { 
1.51      bowersj2 3174:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3175:         my $firstResource = $self->{HERE}->map_start();
                   3176:         my $finishResource = $self->{HERE}->map_finish();
                   3177: 
                   3178:         $self->{RECURSIVE_ITERATOR} =
1.94      bowersj2 3179:           Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
1.63      bowersj2 3180:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91      bowersj2 3181:                                              $self->{CONDITION}, $self->{DIRECTION});
1.51      bowersj2 3182:     }
                   3183: 
                   3184:     return $self->{HERE};
1.190     bowersj2 3185: }
                   3186: 
                   3187: # Identical to the full iterator methods of the same name. Hate to copy/paste
                   3188: # but I also hate to "inherit" either iterator from the other.
                   3189: 
                   3190: sub getStack {
                   3191:     my $self=shift;
                   3192: 
                   3193:     my @stack;
                   3194: 
                   3195:     $self->populateStack(\@stack);
                   3196: 
                   3197:     return \@stack;
                   3198: }
                   3199: 
                   3200: # Private method: Calls the iterators recursively to populate the stack.
                   3201: sub populateStack {
                   3202:     my $self=shift;
                   3203:     my $stack = shift;
                   3204: 
                   3205:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3206: 
                   3207:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3208:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3209:     }
1.51      bowersj2 3210: }
                   3211: 
1.1       www      3212: 1;
1.2       www      3213: 
1.51      bowersj2 3214: package Apache::lonnavmaps::resource;
1.365     albertel 3215: use Scalar::Util qw(weaken);
1.51      bowersj2 3216: use Apache::lonnet;
                   3217: 
                   3218: =pod
                   3219: 
1.217     bowersj2 3220: =head1 Object: resource 
1.51      bowersj2 3221: 
1.217     bowersj2 3222: X<resource, navmap object>
1.174     albertel 3223: A resource object encapsulates a resource in a resource map, allowing
                   3224: easy manipulation of the resource, querying the properties of the
                   3225: resource (including user properties), and represents a reference that
                   3226: can be used as the canonical representation of the resource by
                   3227: lonnavmap clients like renderers.
                   3228: 
                   3229: A resource only makes sense in the context of a navmap, as some of the
                   3230: data is stored in the navmap object.
                   3231: 
                   3232: You will probably never need to instantiate this object directly. Use
                   3233: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
                   3234: starting resource.
1.51      bowersj2 3235: 
1.188     bowersj2 3236: Resource objects respect the parameter_hiddenparts, which suppresses 
                   3237: various parts according to the wishes of the map author. As of this
                   3238: writing, there is no way to override this parameter, and suppressed
                   3239: parts will never be returned, nor will their response types or ids be
                   3240: stored.
                   3241: 
1.217     bowersj2 3242: =head2 Overview
1.51      bowersj2 3243: 
1.217     bowersj2 3244: A B<Resource> is the most granular type of object in LON-CAPA that can
                   3245: be included in a course. It can either be a particular resource, like
                   3246: an HTML page, external resource, problem, etc., or it can be a
                   3247: container sequence, such as a "page" or a "map".
                   3248: 
                   3249: To see a sequence from the user's point of view, please see the
                   3250: B<Creating a Course: Maps and Sequences> chapter of the Author's
                   3251: Manual.
                   3252: 
                   3253: A Resource Object, once obtained from a navmap object via a B<getBy*>
                   3254: method of the navmap, or from an iterator, allows you to query
                   3255: information about that resource.
                   3256: 
                   3257: Generally, you do not ever want to create a resource object yourself,
                   3258: so creation has been left undocumented. Always retrieve resources
                   3259: from navmap objects.
                   3260: 
                   3261: =head3 Identifying Resources
                   3262: 
                   3263: X<big hash>Every resource is identified by a Resource ID in the big hash that is
                   3264: unique to that resource for a given course. X<resource ID, in big hash>
                   3265: The Resource ID has the form #.#, where the first number is the same
                   3266: for every resource in a map, and the second is unique. For instance,
                   3267: for a course laid out like this:
                   3268: 
                   3269:  * Problem 1
                   3270:  * Map
                   3271:    * Resource 2
                   3272:    * Resource 3
                   3273: 
                   3274: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
                   3275: C<Resource 3> will share a first number. The second number may end up
                   3276: re-used between the two groups.
                   3277: 
                   3278: The resource ID is only used in the big hash, but can be used in the
                   3279: context of a course to identify a resource easily. (For instance, the
                   3280: printing system uses it to record which resources from a sequence you 
                   3281: wish to print.)
                   3282: 
                   3283: X<symb> X<resource, symb>
                   3284: All resources also have B<symb>s, which uniquely identify a resource
                   3285: in a course. Many internal LON-CAPA functions expect a symb. A symb
                   3286: carries along with it the URL of the resource, and the map it appears
                   3287: in. Symbs are much larger then resource IDs.
1.51      bowersj2 3288: 
                   3289: =cut
                   3290: 
                   3291: sub new {
                   3292:     # magic invocation to create a class instance
                   3293:     my $proto = shift;
                   3294:     my $class = ref($proto) || $proto;
                   3295:     my $self = {};
                   3296: 
1.300     albertel 3297:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3298:     $self->{ID} = shift;
                   3299: 
                   3300:     # Store this new resource in the parent nav map's cache.
                   3301:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66      bowersj2 3302:     $self->{RESOURCE_ERROR} = 0;
1.51      bowersj2 3303: 
                   3304:     # A hash that can be used by two-pass algorithms to store data
                   3305:     # about this resource in. Not used by the resource object
                   3306:     # directly.
                   3307:     $self->{DATA} = {};
                   3308:    
                   3309:     bless($self);
                   3310:     
                   3311:     return $self;
                   3312: }
                   3313: 
1.70      bowersj2 3314: # private function: simplify the NAV_HASH lookups we keep doing
                   3315: # pass the name, and to automatically append my ID, pass a true val on the
                   3316: # second param
                   3317: sub navHash {
                   3318:     my $self = shift;
                   3319:     my $param = shift;
                   3320:     my $id = shift;
1.115     bowersj2 3321:     return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70      bowersj2 3322: }
                   3323: 
1.51      bowersj2 3324: =pod
                   3325: 
1.217     bowersj2 3326: =head2 Methods
1.70      bowersj2 3327: 
1.217     bowersj2 3328: Once you have a resource object, here's what you can do with it:
                   3329: 
                   3330: =head3 Attribute Retrieval
                   3331: 
                   3332: Every resource has certain attributes that can be retrieved and used:
1.70      bowersj2 3333: 
                   3334: =over 4
                   3335: 
1.217     bowersj2 3336: =item * B<ID>: Every resource has an ID that is unique for that
                   3337:     resource in the course it is in. The ID is actually in the hash
                   3338:     representing the resource, so for a resource object $res, obtain
                   3339:     it via C<$res->{ID}).
                   3340: 
1.174     albertel 3341: =item * B<compTitle>:
                   3342: 
                   3343: Returns a "composite title", that is equal to $res->title() if the
                   3344: resource has a title, and is otherwise the last part of the URL (e.g.,
                   3345: "problem.problem").
                   3346: 
                   3347: =item * B<ext>:
                   3348: 
                   3349: Returns true if the resource is external.
                   3350: 
                   3351: =item * B<kind>:
                   3352: 
                   3353: Returns the kind of the resource from the compiled nav map.
                   3354: 
                   3355: =item * B<randomout>:
1.106     bowersj2 3356: 
1.174     albertel 3357: Returns true if this resource was chosen to NOT be shown to the user
                   3358: by the random map selection feature. In other words, this is usually
                   3359: false.
1.70      bowersj2 3360: 
1.174     albertel 3361: =item * B<randompick>:
1.70      bowersj2 3362: 
1.174     albertel 3363: Returns true for a map if the randompick feature is being used on the
                   3364: map. (?)
1.70      bowersj2 3365: 
1.174     albertel 3366: =item * B<src>:
1.51      bowersj2 3367: 
1.174     albertel 3368: Returns the source for the resource.
1.70      bowersj2 3369: 
1.174     albertel 3370: =item * B<symb>:
1.70      bowersj2 3371: 
1.174     albertel 3372: Returns the symb for the resource.
1.70      bowersj2 3373: 
1.174     albertel 3374: =item * B<title>:
1.70      bowersj2 3375: 
1.174     albertel 3376: Returns the title of the resource.
                   3377: 
1.51      bowersj2 3378: =back
                   3379: 
                   3380: =cut
                   3381: 
                   3382: # These info functions can be used directly, as they don't return
                   3383: # resource information.
1.85      bowersj2 3384: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.303     albertel 3385: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
1.70      bowersj2 3386: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85      bowersj2 3387: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217     bowersj2 3388: # considered private and undocumented
1.51      bowersj2 3389: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   3390: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68      bowersj2 3391: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
                   3392: sub randompick { 
                   3393:     my $self = shift;
1.370     albertel 3394:     return $self->parmval('randompick');
1.68      bowersj2 3395: }
1.303     albertel 3396: sub link {
                   3397:     my $self=shift;
                   3398:     if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
                   3399:     return $self->src;
                   3400: }
1.51      bowersj2 3401: sub src { 
                   3402:     my $self=shift;
                   3403:     return $self->navHash("src_", 1);
                   3404: }
1.303     albertel 3405: sub shown_symb {
                   3406:     my $self=shift;
                   3407:     if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
                   3408:     return $self->symb();
                   3409: }
1.328     www      3410: sub id {
                   3411:     my $self=shift;
                   3412:     return $self->{ID};
                   3413: }
                   3414: sub enclosing_map_src {
                   3415:     my $self=shift;
                   3416:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3417:     return $self->navHash('map_id_'.$first);
                   3418: }
1.51      bowersj2 3419: sub symb {
                   3420:     my $self=shift;
                   3421:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3422:     my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223     albertel 3423:     my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
1.51      bowersj2 3424:         . '___' . $second . '___' . $symbSrc;
1.223     albertel 3425:     return &Apache::lonnet::symbclean($symb);
1.51      bowersj2 3426: }
1.321     raeburn  3427: sub wrap_symb {
                   3428:     my $self = shift;
                   3429:     return $self->{NAV_MAP}->wrap_symb($self->symb());
                   3430: }
1.213     bowersj2 3431: sub title { 
                   3432:     my $self=shift; 
                   3433:     if ($self->{ID} eq '0.0') {
                   3434: 	# If this is the top-level map, return the title of the course
                   3435: 	# since this map can not be titled otherwise.
1.320     albertel 3436: 	return $env{'course.'.$env{'request.course.id'}.'.description'};
1.213     bowersj2 3437:     }
                   3438:     return $self->navHash("title_", 1); }
1.217     bowersj2 3439: # considered private and undocumented
1.70      bowersj2 3440: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.301     albertel 3441: sub condition {
                   3442:     my $self=shift;
                   3443:     my $undercond=$self->navHash("undercond_", 1);
                   3444:     if (!defined($undercond)) { return 1; };
                   3445:     my $condid=$self->navHash("condid_$undercond");
                   3446:     if (!defined($condid)) { return 1; };
                   3447:     my $condition=&Apache::lonnet::directcondval($condid);
                   3448:     return $condition;
                   3449: }
1.342     albertel 3450: sub condval {
                   3451:     my $self=shift;
1.359     albertel 3452:     my ($pathname,$filename) = 
                   3453: 	&Apache::lonnet::split_uri_for_cond($self->src());
1.342     albertel 3454: 
                   3455:     my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
                   3456: 	       /\&\Q$filename\E\:([\d\|]+)\&/);
                   3457:     if ($match) {
                   3458: 	return &Apache::lonnet::condval($1);
                   3459:     }
                   3460:     return 0;
                   3461: }
1.106     bowersj2 3462: sub compTitle {
                   3463:     my $self = shift;
                   3464:     my $title = $self->title();
1.176     www      3465:     $title=~s/\&colon\;/\:/gs;
1.106     bowersj2 3466:     if (!$title) {
                   3467:         $title = $self->src();
                   3468:         $title = substr($title, rindex($title, '/') + 1);
                   3469:     }
                   3470:     return $title;
                   3471: }
1.70      bowersj2 3472: =pod
                   3473: 
                   3474: B<Predicate Testing the Resource>
                   3475: 
                   3476: These methods are shortcuts to deciding if a given resource has a given property.
                   3477: 
                   3478: =over 4
                   3479: 
1.174     albertel 3480: =item * B<is_map>:
                   3481: 
                   3482: Returns true if the resource is a map type.
                   3483: 
                   3484: =item * B<is_problem>:
1.70      bowersj2 3485: 
1.174     albertel 3486: Returns true if the resource is a problem type, false
                   3487: otherwise. (Looks at the extension on the src field; might need more
                   3488: to work correctly.)
1.70      bowersj2 3489: 
1.174     albertel 3490: =item * B<is_page>:
1.70      bowersj2 3491: 
1.174     albertel 3492: Returns true if the resource is a page.
                   3493: 
                   3494: =item * B<is_sequence>:
                   3495: 
                   3496: Returns true if the resource is a sequence.
1.70      bowersj2 3497: 
                   3498: =back
                   3499: 
                   3500: =cut
                   3501: 
1.256     albertel 3502: sub hasResource {
                   3503:    my $self = shift;
                   3504:    return $self->{NAV_MAP}->hasResource(@_);
                   3505: }
                   3506: 
                   3507: sub retrieveResources {
                   3508:    my $self = shift;
                   3509:    return $self->{NAV_MAP}->retrieveResources(@_);
                   3510: }
1.70      bowersj2 3511: 
1.369     albertel 3512: sub is_exam {
                   3513:     my ($self,$part) = @_;
                   3514:     if ($self->parmval('type',$part) eq 'exam') {
                   3515:         return 1;
                   3516:     }
                   3517:     if ($self->src() =~ /\.(exam)$/) {
                   3518:         return 1;
                   3519:     }
                   3520:     return 0;
                   3521: }
1.70      bowersj2 3522: sub is_html {
1.51      bowersj2 3523:     my $self=shift;
                   3524:     my $src = $self->src();
1.70      bowersj2 3525:     return ($src =~ /html$/);
1.51      bowersj2 3526: }
1.70      bowersj2 3527: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   3528: sub is_page {
1.51      bowersj2 3529:     my $self=shift;
                   3530:     my $src = $self->src();
1.205     bowersj2 3531:     return $self->navHash("is_map_", 1) && 
                   3532: 	$self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51      bowersj2 3533: }
1.361     albertel 3534: sub is_practice {
                   3535:     my $self=shift;
                   3536:     my ($part) = @_;
                   3537:     if ($self->parmval('type',$part) eq 'practice') {
                   3538:         return 1;
                   3539:     }
                   3540:     return 0;
                   3541: }
1.70      bowersj2 3542: sub is_problem {
1.51      bowersj2 3543:     my $self=shift;
                   3544:     my $src = $self->src();
1.361     albertel 3545:     if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
                   3546: 	return !($self->is_practice());
                   3547:     }
                   3548:     return 0;
1.256     albertel 3549: }
                   3550: sub contains_problem {
                   3551:     my $self=shift;
                   3552:     if ($self->is_page()) {
                   3553: 	my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3554: 	return $hasProblem;
                   3555:     }
                   3556:     return 0;
1.51      bowersj2 3557: }
1.70      bowersj2 3558: sub is_sequence {
1.51      bowersj2 3559:     my $self=shift;
1.205     bowersj2 3560:     return $self->navHash("is_map_", 1) && 
                   3561: 	$self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51      bowersj2 3562: }
1.261     matthew  3563: sub is_survey {
                   3564:     my $self = shift();
                   3565:     my $part = shift();
1.263     albertel 3566:     if ($self->parmval('type',$part) eq 'survey') {
1.261     matthew  3567:         return 1;
                   3568:     }
1.263     albertel 3569:     if ($self->src() =~ /\.(survey)$/) {
1.261     matthew  3570:         return 1;
                   3571:     }
                   3572:     return 0;
                   3573: }
1.360     albertel 3574: sub is_task {
                   3575:     my $self=shift;
                   3576:     my $src = $self->src();
                   3577:     return ($src =~ /\.(task)$/)
                   3578: }
1.51      bowersj2 3579: 
1.266     raeburn  3580: sub is_empty_sequence {
                   3581:     my $self=shift;
                   3582:     my $src = $self->src();
                   3583:     return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
                   3584: }
                   3585: 
1.101     bowersj2 3586: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51      bowersj2 3587: sub parmval {
                   3588:     my $self = shift;
                   3589:     my $what = shift;
1.185     bowersj2 3590:     my $part = shift;
                   3591:     if (!defined($part)) { 
                   3592:         $part = '0'; 
                   3593:     }
1.51      bowersj2 3594:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   3595: }
                   3596: 
1.70      bowersj2 3597: =pod
                   3598: 
                   3599: B<Map Methods>
                   3600: 
1.174     albertel 3601: These methods are useful for getting information about the map
                   3602: properties of the resource, if the resource is a map (B<is_map>).
1.70      bowersj2 3603: 
                   3604: =over 4
                   3605: 
1.174     albertel 3606: =item * B<map_finish>:
                   3607: 
                   3608: Returns a reference to a resource object corresponding to the finish
                   3609: resource of the map.
1.70      bowersj2 3610: 
1.174     albertel 3611: =item * B<map_pc>:
1.70      bowersj2 3612: 
1.174     albertel 3613: Returns the pc value of the map, which is the first number that
                   3614: appears in the resource ID of the resources in the map, and is the
                   3615: number that appears around the middle of the symbs of the resources in
                   3616: that map.
1.70      bowersj2 3617: 
1.174     albertel 3618: =item * B<map_start>:
                   3619: 
                   3620: Returns a reference to a resource object corresponding to the start
                   3621: resource of the map.
                   3622: 
                   3623: =item * B<map_type>:
                   3624: 
                   3625: Returns a string with the type of the map in it.
1.70      bowersj2 3626: 
                   3627: =back
1.51      bowersj2 3628: 
1.70      bowersj2 3629: =cut
1.51      bowersj2 3630: 
                   3631: sub map_finish {
                   3632:     my $self = shift;
                   3633:     my $src = $self->src();
1.381     albertel 3634:     $src = &Apache::lonnet::clutter($src);
1.51      bowersj2 3635:     my $res = $self->navHash("map_finish_$src", 0);
                   3636:     $res = $self->{NAV_MAP}->getById($res);
                   3637:     return $res;
                   3638: }
1.70      bowersj2 3639: sub map_pc {
                   3640:     my $self = shift;
1.381     albertel 3641:     my $src = $self->src();
1.70      bowersj2 3642:     return $self->navHash("map_pc_$src", 0);
                   3643: }
1.51      bowersj2 3644: sub map_start {
                   3645:     my $self = shift;
                   3646:     my $src = $self->src();
1.381     albertel 3647:     $src = &Apache::lonnet::clutter($src);
1.51      bowersj2 3648:     my $res = $self->navHash("map_start_$src", 0);
                   3649:     $res = $self->{NAV_MAP}->getById($res);
                   3650:     return $res;
                   3651: }
                   3652: sub map_type {
                   3653:     my $self = shift;
                   3654:     my $pc = $self->map_pc();
                   3655:     return $self->navHash("map_type_$pc", 0);
                   3656: }
                   3657: 
                   3658: #####
                   3659: # Property queries
                   3660: #####
                   3661: 
                   3662: # These functions will be responsible for returning the CORRECT
                   3663: # VALUE for the parameter, no matter what. So while they may look
                   3664: # like direct calls to parmval, they can be more then that.
                   3665: # So, for instance, the duedate function should use the "duedatetype"
                   3666: # information, rather then the resource object user.
                   3667: 
                   3668: =pod
                   3669: 
                   3670: =head2 Resource Parameters
                   3671: 
1.174     albertel 3672: In order to use the resource parameters correctly, the nav map must
                   3673: have been instantiated with genCourseAndUserOptions set to true, so
                   3674: the courseopt and useropt is read correctly. Then, you can call these
                   3675: functions to get the relevant parameters for the resource. Each
                   3676: function defaults to part "0", but can be directed to another part by
                   3677: passing the part as the parameter.
                   3678: 
                   3679: These methods are responsible for getting the parameter correct, not
                   3680: merely reflecting the contents of the GDBM hashes. As we move towards
                   3681: dates relative to other dates, these methods should be updated to
                   3682: reflect that. (Then, anybody using these methods will not have to update
                   3683: their code.)
                   3684: 
                   3685: =over 4
                   3686: 
                   3687: =item * B<acc>:
                   3688: 
                   3689: Get the Client IP/Name Access Control information.
1.51      bowersj2 3690: 
1.174     albertel 3691: =item * B<answerdate>:
1.51      bowersj2 3692: 
1.174     albertel 3693: Get the answer-reveal date for the problem.
                   3694: 
1.211     bowersj2 3695: =item * B<awarded>: 
                   3696: 
                   3697: Gets the awarded value for the problem part. Requires genUserData set to
                   3698: true when the navmap object was created.
                   3699: 
1.174     albertel 3700: =item * B<duedate>:
                   3701: 
                   3702: Get the due date for the problem.
                   3703: 
                   3704: =item * B<tries>:
                   3705: 
                   3706: Get the number of tries the student has used on the problem.
                   3707: 
                   3708: =item * B<maxtries>:
                   3709: 
                   3710: Get the number of max tries allowed.
                   3711: 
                   3712: =item * B<opendate>:
1.51      bowersj2 3713: 
1.174     albertel 3714: Get the open date for the problem.
1.51      bowersj2 3715: 
1.174     albertel 3716: =item * B<sig>:
1.51      bowersj2 3717: 
1.174     albertel 3718: Get the significant figures setting.
1.51      bowersj2 3719: 
1.174     albertel 3720: =item * B<tol>:
1.51      bowersj2 3721: 
1.174     albertel 3722: Get the tolerance for the problem.
1.51      bowersj2 3723: 
1.174     albertel 3724: =item * B<tries>:
1.51      bowersj2 3725: 
1.174     albertel 3726: Get the number of tries the user has already used on the problem.
1.51      bowersj2 3727: 
1.174     albertel 3728: =item * B<type>:
1.51      bowersj2 3729: 
1.174     albertel 3730: Get the question type for the problem.
1.70      bowersj2 3731: 
1.174     albertel 3732: =item * B<weight>:
1.51      bowersj2 3733: 
1.174     albertel 3734: Get the weight for the problem.
1.51      bowersj2 3735: 
                   3736: =back
                   3737: 
                   3738: =cut
                   3739: 
                   3740: sub acc {
                   3741:     (my $self, my $part) = @_;
                   3742:     return $self->parmval("acc", $part);
                   3743: }
                   3744: sub answerdate {
                   3745:     (my $self, my $part) = @_;
                   3746:     # Handle intervals
                   3747:     if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
                   3748:         return $self->duedate($part) + 
                   3749:             $self->parmval("answerdate", $part);
                   3750:     }
                   3751:     return $self->parmval("answerdate", $part);
1.106     bowersj2 3752: }
1.211     bowersj2 3753: sub awarded { 
                   3754:     my $self = shift; my $part = shift;
1.221     bowersj2 3755:     $self->{NAV_MAP}->get_user_data();
1.211     bowersj2 3756:     if (!defined($part)) { $part = '0'; }
                   3757:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
                   3758: }
1.382     albertel 3759: # this should work exactly like the copy in lonhomework.pm
1.51      bowersj2 3760: sub duedate {
                   3761:     (my $self, my $part) = @_;
1.382     albertel 3762:     my $date;
1.260     albertel 3763:     my $interval=$self->parmval("interval", $part);
1.382     albertel 3764:     my $due_date=$self->parmval("duedate", $part);
1.390     albertel 3765:     if ($interval =~ /\d+/) {
1.260     albertel 3766: 	my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
1.382     albertel 3767: 	if (defined($first_access)) {
                   3768: 	    $interval = $first_access+$interval;
                   3769: 	    $date = ($interval < $due_date)? $interval : $due_date;
                   3770: 	} else {
                   3771: 	    $date = $due_date;
                   3772: 	}
                   3773:     } else {
                   3774: 	$date = $due_date;
1.260     albertel 3775:     }
1.382     albertel 3776:     return $date;
1.51      bowersj2 3777: }
1.334     albertel 3778: sub handgrade {
                   3779:     (my $self, my $part) = @_;
                   3780:     return $self->parmval("handgrade", $part);
                   3781: }
1.51      bowersj2 3782: sub maxtries {
                   3783:     (my $self, my $part) = @_;
                   3784:     return $self->parmval("maxtries", $part);
                   3785: }
                   3786: sub opendate {
                   3787:     (my $self, my $part) = @_;
                   3788:     if ($self->parmval("opendate.type", $part) eq 'date_interval') {
                   3789:         return $self->duedate($part) -
                   3790:             $self->parmval("opendate", $part);
                   3791:     }
                   3792:     return $self->parmval("opendate");
                   3793: }
1.185     bowersj2 3794: sub problemstatus {
                   3795:     (my $self, my $part) = @_;
1.236     bowersj2 3796:     return lc $self->parmval("problemstatus", $part);
1.185     bowersj2 3797: }
1.51      bowersj2 3798: sub sig {
                   3799:     (my $self, my $part) = @_;
                   3800:     return $self->parmval("sig", $part);
                   3801: }
                   3802: sub tol {
                   3803:     (my $self, my $part) = @_;
                   3804:     return $self->parmval("tol", $part);
                   3805: }
1.108     bowersj2 3806: sub tries { 
                   3807:     my $self = shift; 
                   3808:     my $tries = $self->queryRestoreHash('tries', shift);
                   3809:     if (!defined($tries)) { return '0';}
1.51      bowersj2 3810:     return $tries;
                   3811: }
1.70      bowersj2 3812: sub type {
                   3813:     (my $self, my $part) = @_;
                   3814:     return $self->parmval("type", $part);
                   3815: }
1.109     bowersj2 3816: sub weight { 
                   3817:     my $self = shift; my $part = shift;
1.211     bowersj2 3818:     if (!defined($part)) { $part = '0'; }
                   3819:     return &Apache::lonnet::EXT('resource.'.$part.'.weight',
1.320     albertel 3820: 				$self->symb(), $env{'user.domain'},
                   3821: 				$env{'user.name'}, 
                   3822: 				$env{'request.course.sec'});
1.274     matthew  3823: }
                   3824: sub part_display {
                   3825:     my $self= shift(); my $partID = shift();
                   3826:     if (! defined($partID)) { $partID = '0'; }
                   3827:     my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
                   3828:                                      $self->symb);
                   3829:     if (! defined($display) || $display eq '') {
                   3830:         $display = $partID;
                   3831:     }
                   3832:     return $display;
1.70      bowersj2 3833: }
1.51      bowersj2 3834: 
                   3835: # Multiple things need this
                   3836: sub getReturnHash {
                   3837:     my $self = shift;
                   3838:     
                   3839:     if (!defined($self->{RETURN_HASH})) {
1.84      bowersj2 3840:         my %tmpHash  = &Apache::lonnet::restore($self->symb());
1.51      bowersj2 3841:         $self->{RETURN_HASH} = \%tmpHash;
                   3842:     }
                   3843: }       
                   3844: 
                   3845: ######
                   3846: # Status queries
                   3847: ######
                   3848: 
                   3849: # These methods query the status of problems.
                   3850: 
                   3851: # If we need to count parts, this function determines the number of
                   3852: # parts from the metadata. When called, it returns a reference to a list
                   3853: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   3854: # tells you how many parts you have in the problem:
                   3855: # $partcount = scalar($resource->countParts());
                   3856: # Don't use $self->{PARTS} directly because you don't know if it's been
                   3857: # computed yet.
                   3858: 
                   3859: =pod
                   3860: 
                   3861: =head2 Resource misc
                   3862: 
                   3863: Misc. functions for the resource.
                   3864: 
                   3865: =over 4
                   3866: 
1.174     albertel 3867: =item * B<hasDiscussion>:
1.59      bowersj2 3868: 
1.174     albertel 3869: Returns a false value if there has been discussion since the user last
                   3870: logged in, true if there has. Always returns false if the discussion
                   3871: data was not extracted when the nav map was constructed.
                   3872: 
1.366     albertel 3873: =item * B<last_post_time>:
                   3874: 
                   3875: Returns a false value if there hasn't been discussion otherwise returns
                   3876: unix timestamp of last time a discussion posting (or edit) was made.
                   3877: 
1.393     raeburn  3878: =item * B<discussion_info>:
1.366     albertel 3879: 
1.393     raeburn  3880: optional argument is a filter (currently can be 'unread');
                   3881: returns in scalar context the count of the number of discussion postings.
1.366     albertel 3882: 
                   3883: returns in list context both the count of postings and a hash ref
1.393     raeburn  3884: containing information about the postings (subject, id, timestamp) in a hash.
                   3885: 
                   3886: Default is to return counts for all postings.  However if called with a second argument set to 'unread', will return information about only unread postings.
1.366     albertel 3887: 
1.174     albertel 3888: =item * B<getFeedback>:
                   3889: 
                   3890: Gets the feedback for the resource and returns the raw feedback string
                   3891: for the resource, or the null string if there is no feedback or the
                   3892: email data was not extracted when the nav map was constructed. Usually
                   3893: used like this:
1.59      bowersj2 3894: 
1.394     raeburn  3895:  for my $url (split(/\,/, $res->getFeedback())) {
                   3896:     my $link = &escape($url);
1.59      bowersj2 3897:     ...
                   3898: 
                   3899: and use the link as appropriate.
                   3900: 
                   3901: =cut
                   3902: 
                   3903: sub hasDiscussion {
                   3904:     my $self = shift;
                   3905:     return $self->{NAV_MAP}->hasDiscussion($self->symb());
                   3906: }
                   3907: 
1.366     albertel 3908: sub last_post_time {
                   3909:     my $self = shift;
                   3910:     return $self->{NAV_MAP}->last_post_time($self->symb());
                   3911: }
                   3912: 
1.393     raeburn  3913: sub discussion_info {
                   3914:     my ($self,$filter) = @_;
                   3915:     return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
1.366     albertel 3916: }
                   3917: 
1.59      bowersj2 3918: sub getFeedback {
                   3919:     my $self = shift;
1.124     bowersj2 3920:     my $source = $self->src();
1.395   ! raeburn  3921:     my $symb = $self->symb();
1.125     bowersj2 3922:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.395   ! raeburn  3923:     return $self->{NAV_MAP}->getFeedback($symb,$source);
1.124     bowersj2 3924: }
                   3925: 
                   3926: sub getErrors {
                   3927:     my $self = shift;
                   3928:     my $source = $self->src();
1.395   ! raeburn  3929:     my $symb = $self->symb();
1.124     bowersj2 3930:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.395   ! raeburn  3931:     return $self->{NAV_MAP}->getErrors($symb,$source);
1.59      bowersj2 3932: }
                   3933: 
                   3934: =pod
                   3935: 
1.174     albertel 3936: =item * B<parts>():
1.51      bowersj2 3937: 
1.174     albertel 3938: Returns a list reference containing sorted strings corresponding to
1.193     bowersj2 3939: each part of the problem. Single part problems have only a part '0'.
                   3940: Multipart problems do not return their part '0', since they typically
                   3941: do not really matter. 
1.174     albertel 3942: 
                   3943: =item * B<countParts>():
                   3944: 
                   3945: Returns the number of parts of the problem a student can answer. Thus,
                   3946: for single part problems, returns 1. For multipart, it returns the
1.193     bowersj2 3947: number of parts in the problem, not including psuedo-part 0. 
1.51      bowersj2 3948: 
1.290     matthew  3949: =item * B<countResponses>():
                   3950: 
                   3951: Returns the total number of responses in the problem a student can answer.
                   3952: 
                   3953: =item * B<responseTypes>():
                   3954: 
                   3955: Returns a hash whose keys are the response types.  The values are the number 
                   3956: of times each response type is used.  This is for the I<entire> problem, not 
                   3957: just a single part.
                   3958: 
1.192     bowersj2 3959: =item * B<multipart>():
                   3960: 
1.193     bowersj2 3961: Returns true if the problem is multipart, false otherwise. Use this instead
                   3962: of countParts if all you want is multipart/not multipart.
1.192     bowersj2 3963: 
1.187     bowersj2 3964: =item * B<responseType>($part):
                   3965: 
                   3966: Returns the response type of the part, without the word "response" on the
                   3967: end. Example return values: 'string', 'essay', 'numeric', etc.
                   3968: 
1.193     bowersj2 3969: =item * B<responseIds>($part):
1.187     bowersj2 3970: 
1.193     bowersj2 3971: Retreives the response IDs for the given part as an array reference containing
                   3972: strings naming the response IDs. This may be empty.
1.187     bowersj2 3973: 
1.51      bowersj2 3974: =back
                   3975: 
                   3976: =cut
                   3977: 
                   3978: sub parts {
                   3979:     my $self = shift;
                   3980: 
1.192     bowersj2 3981:     if ($self->ext) { return []; }
1.67      bowersj2 3982: 
1.51      bowersj2 3983:     $self->extractParts();
                   3984:     return $self->{PARTS};
                   3985: }
                   3986: 
                   3987: sub countParts {
                   3988:     my $self = shift;
                   3989:     
                   3990:     my $parts = $self->parts();
1.191     bowersj2 3991: 
                   3992:     # If I left this here, then it's not necessary.
                   3993:     #my $delta = 0;
                   3994:     #for my $part (@$parts) {
                   3995:     #    if ($part eq '0') { $delta--; }
                   3996:     #}
1.66      bowersj2 3997: 
                   3998:     if ($self->{RESOURCE_ERROR}) {
                   3999:         return 0;
                   4000:     }
                   4001: 
1.191     bowersj2 4002:     return scalar(@{$parts}); # + $delta;
1.192     bowersj2 4003: }
                   4004: 
1.290     matthew  4005: sub countResponses {
                   4006:     my $self = shift;
                   4007:     my $count;
1.293     matthew  4008:     foreach my $part (@{$self->parts()}) {
                   4009:         $count+= scalar($self->responseIds($part));
1.290     matthew  4010:     }
                   4011:     return $count;
                   4012: }
                   4013: 
                   4014: sub responseTypes {
                   4015:     my $self = shift;
1.291     albertel 4016:     my %responses;
1.368     raeburn  4017:     foreach my $part (@{$self->parts()}) {
1.290     matthew  4018:         foreach my $responsetype ($self->responseType($part)) {
1.291     albertel 4019:             $responses{$responsetype}++ if (defined($responsetype));
1.290     matthew  4020:         }
                   4021:     }
1.291     albertel 4022:     return %responses;
1.290     matthew  4023: }
                   4024: 
1.192     bowersj2 4025: sub multipart {
                   4026:     my $self = shift;
                   4027:     return $self->countParts() > 1;
1.51      bowersj2 4028: }
                   4029: 
1.225     bowersj2 4030: sub singlepart {
                   4031:     my $self = shift;
                   4032:     return $self->countParts() == 1;
                   4033: }
                   4034: 
1.187     bowersj2 4035: sub responseType {
1.184     bowersj2 4036:     my $self = shift;
                   4037:     my $part = shift;
                   4038: 
                   4039:     $self->extractParts();
1.235     albertel 4040:     if (defined($self->{RESPONSE_TYPES}->{$part})) {
                   4041: 	return @{$self->{RESPONSE_TYPES}->{$part}};
                   4042:     } else {
                   4043: 	return undef;
                   4044:     }
1.187     bowersj2 4045: }
                   4046: 
1.193     bowersj2 4047: sub responseIds {
1.187     bowersj2 4048:     my $self = shift;
                   4049:     my $part = shift;
                   4050: 
                   4051:     $self->extractParts();
1.235     albertel 4052:     if (defined($self->{RESPONSE_IDS}->{$part})) {
                   4053: 	return @{$self->{RESPONSE_IDS}->{$part}};
                   4054:     } else {
                   4055: 	return undef;
                   4056:     }
1.184     bowersj2 4057: }
                   4058: 
                   4059: # Private function: Extracts the parts information, both part names and
1.187     bowersj2 4060: # part types, and saves it. 
1.51      bowersj2 4061: sub extractParts { 
                   4062:     my $self = shift;
                   4063:     
1.153     bowersj2 4064:     return if (defined($self->{PARTS}));
1.67      bowersj2 4065:     return if ($self->ext);
1.51      bowersj2 4066: 
                   4067:     $self->{PARTS} = [];
                   4068: 
1.181     bowersj2 4069:     my %parts;
                   4070: 
1.82      bowersj2 4071:     # Retrieve part count, if this is a problem
                   4072:     if ($self->is_problem()) {
1.240     albertel 4073: 	my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152     matthew  4074:         my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181     bowersj2 4075: 
1.239     bowersj2 4076: 	if ($partorder) {
                   4077: 	    my @parts;
                   4078: 	    for my $part (split (/,/,$partorder)) {
                   4079: 		if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4080: 		    push @parts, $part;
1.241     albertel 4081: 		    $parts{$part} = 1;
1.239     bowersj2 4082: 		}
                   4083: 	    }
                   4084: 	    $self->{PARTS} = \@parts;
                   4085: 	} else {
                   4086: 	    if (!$metadata) {
                   4087: 		$self->{RESOURCE_ERROR} = 1;
                   4088: 		$self->{PARTS} = [];
                   4089: 		$self->{PART_TYPE} = {};
                   4090: 		return;
                   4091: 	    }
1.394     raeburn  4092: 	    foreach my $entry (split(/\,/,$metadata)) {
                   4093: 		if ($entry =~ /^(?:part|Task)_(.*)$/) {
1.239     bowersj2 4094: 		    my $part = $1;
                   4095: 		    # This floods the logs if it blows up
                   4096: 		    if (defined($parts{$part})) {
1.241     albertel 4097: 			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
                   4098: 		    }
1.239     bowersj2 4099: 		    
                   4100: 		    # check to see if part is turned off.
                   4101: 		    
                   4102: 		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4103: 			$parts{$part} = 1;
                   4104: 		    }
                   4105: 		}
                   4106: 	    }
                   4107: 	    my @sortedParts = sort keys %parts;
                   4108: 	    $self->{PARTS} = \@sortedParts;
1.51      bowersj2 4109:         }
1.82      bowersj2 4110:         
1.187     bowersj2 4111: 
1.284     matthew  4112:         # These hashes probably do not need names that end with "Hash"....
1.187     bowersj2 4113:         my %responseIdHash;
                   4114:         my %responseTypeHash;
                   4115: 
1.189     bowersj2 4116: 
                   4117:         # Init the responseIdHash
1.394     raeburn  4118:         foreach my $part (@{$self->{PARTS}}) {
                   4119:             $responseIdHash{$part} = [];
1.189     bowersj2 4120:         }
                   4121: 
1.187     bowersj2 4122:         # Now, the unfortunate thing about this is that parts, part name, and
1.239     bowersj2 4123:         # response id are delimited by underscores, but both the part
1.187     bowersj2 4124:         # name and response id can themselves have underscores in them.
                   4125:         # So we have to use our knowlege of part names to figure out 
                   4126:         # where the part names begin and end, and even then, it is possible
                   4127:         # to construct ambiguous situations.
1.379     albertel 4128:         foreach my $data (split /,/, $metadata) {
                   4129:             if ($data =~ /^([a-zA-Z]+)response_(.*)/
                   4130: 		|| $data =~ /^(Task)_(.*)/) {
1.187     bowersj2 4131:                 my $responseType = $1;
                   4132:                 my $partStuff = $2;
                   4133:                 my $partIdSoFar = '';
                   4134:                 my @partChunks = split /_/, $partStuff;
                   4135:                 my $i = 0;
                   4136:                 for ($i = 0; $i < scalar(@partChunks); $i++) {
                   4137:                     if ($partIdSoFar) { $partIdSoFar .= '_'; }
                   4138:                     $partIdSoFar .= $partChunks[$i];
                   4139:                     if ($parts{$partIdSoFar}) {
                   4140:                         my @otherChunks = @partChunks[$i+1..$#partChunks];
                   4141:                         my $responseId = join('_', @otherChunks);
1.379     albertel 4142: 			if ($self->is_task()) {
                   4143: 			    push(@{$responseIdHash{$partIdSoFar}},
                   4144: 				 $partIdSoFar);
                   4145: 			} else {
                   4146: 			    push(@{$responseIdHash{$partIdSoFar}},
                   4147: 				 $responseId);
                   4148: 			}
                   4149:                         push(@{$responseTypeHash{$partIdSoFar}},
                   4150: 			     $responseType);
1.187     bowersj2 4151:                     }
                   4152:                 }
                   4153:             }
                   4154:         }
1.264     albertel 4155: 	my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
1.284     matthew  4156:         #
                   4157:         # Reorder the arrays in the %responseIdHash and %responseTypeHash
1.264     albertel 4158: 	if ($resorder) {
                   4159: 	    my @resorder=split(/,/,$resorder);
                   4160: 	    foreach my $part (keys(%responseIdHash)) {
1.286     albertel 4161: 		my $i=0;
                   4162: 		my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
1.264     albertel 4163: 		my @neworder;
                   4164: 		foreach my $possibleid (@resorder) {
                   4165: 		    if (exists($resids{$possibleid})) {
1.286     albertel 4166: 			push(@neworder,$resids{$possibleid});
1.264     albertel 4167: 		    }
                   4168: 		}
1.286     albertel 4169: 		my @ids;
                   4170: 		my @type;
                   4171: 		foreach my $element (@neworder) {
                   4172: 		    push (@ids,$responseIdHash{$part}->[$element]);
                   4173: 		    push (@type,$responseTypeHash{$part}->[$element]);
                   4174: 		}
                   4175: 		$responseIdHash{$part}=\@ids;
                   4176: 		$responseTypeHash{$part}=\@type;
1.264     albertel 4177: 	    }
                   4178: 	}
1.187     bowersj2 4179:         $self->{RESPONSE_IDS} = \%responseIdHash;
                   4180:         $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154     bowersj2 4181:     }
                   4182: 
1.51      bowersj2 4183:     return;
                   4184: }
                   4185: 
                   4186: =pod
                   4187: 
                   4188: =head2 Resource Status
                   4189: 
1.174     albertel 4190: Problem resources have status information, reflecting their various
                   4191: dates and completion statuses.
1.51      bowersj2 4192: 
1.174     albertel 4193: There are two aspects to the status: the date-related information and
                   4194: the completion information.
1.51      bowersj2 4195: 
1.174     albertel 4196: Idiomatic usage of these two methods would probably look something
                   4197: like
1.51      bowersj2 4198: 
1.394     raeburn  4199:  foreach my $part ($resource->parts()) {
                   4200:     my $dateStatus = $resource->getDateStatus($part);
                   4201:     my $completionStatus = $resource->getCompletionStatus($part);
1.51      bowersj2 4202: 
1.70      bowersj2 4203:     or
                   4204: 
1.394     raeburn  4205:     my $status = $resource->status($part);
1.70      bowersj2 4206: 
1.51      bowersj2 4207:     ... use it here ...
                   4208:  }
                   4209: 
1.174     albertel 4210: Which you use depends on exactly what you are looking for. The
                   4211: status() function has been optimized for the nav maps display and may
                   4212: not precisely match what you need elsewhere.
1.101     bowersj2 4213: 
1.174     albertel 4214: The symbolic constants shown below can be accessed through the
                   4215: resource object: C<$res->OPEN>.
1.101     bowersj2 4216: 
1.51      bowersj2 4217: =over 4
                   4218: 
1.174     albertel 4219: =item * B<getDateStatus>($part):
                   4220: 
                   4221: ($part defaults to 0). A convenience function that returns a symbolic
                   4222: constant telling you about the date status of the part. The possible
                   4223: return values are:
1.51      bowersj2 4224: 
                   4225: =back
                   4226: 
                   4227: B<Date Codes>
                   4228: 
                   4229: =over 4
                   4230: 
1.174     albertel 4231: =item * B<OPEN_LATER>:
                   4232: 
                   4233: The problem will be opened later.
                   4234: 
                   4235: =item * B<OPEN>:
                   4236: 
                   4237: Open and not yet due.
                   4238: 
1.51      bowersj2 4239: 
1.174     albertel 4240: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4241: 
1.174     albertel 4242: The due date has passed, but the answer date has not yet arrived.
1.59      bowersj2 4243: 
1.174     albertel 4244: =item * B<PAST_DUE_NO_ANSWER>:
1.54      bowersj2 4245: 
1.174     albertel 4246: The due date has passed and there is no answer opening date set.
1.51      bowersj2 4247: 
1.174     albertel 4248: =item * B<ANSWER_OPEN>:
1.51      bowersj2 4249: 
1.174     albertel 4250: The answer date is here.
                   4251: 
                   4252: =item * B<NETWORK_FAILURE>:
                   4253: 
                   4254: The information is unknown due to network failure.
1.51      bowersj2 4255: 
                   4256: =back
                   4257: 
                   4258: =cut
                   4259: 
                   4260: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 4261: sub OPEN_LATER             { return 0; }
                   4262: sub OPEN                   { return 1; }
                   4263: sub PAST_DUE_NO_ANSWER     { return 2; }
                   4264: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   4265: sub ANSWER_OPEN            { return 4; }
                   4266: sub NOTHING_SET            { return 5; } 
                   4267: sub NETWORK_FAILURE        { return 100; }
                   4268: 
                   4269: # getDateStatus gets the date status for a given problem part. 
                   4270: # Because answer date, due date, and open date are fully independent
                   4271: # (i.e., it is perfectly possible to *only* have an answer date), 
                   4272: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   4273: # (past, future, none given). This function handles this with a decision
                   4274: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 4275: 
                   4276: sub getDateStatus {
                   4277:     my $self = shift;
                   4278:     my $part = shift;
                   4279:     $part = "0" if (!defined($part));
1.54      bowersj2 4280: 
                   4281:     # Always return network failure if there was one.
1.51      bowersj2 4282:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4283: 
                   4284:     my $now = time();
                   4285: 
1.53      bowersj2 4286:     my $open = $self->opendate($part);
                   4287:     my $due = $self->duedate($part);
                   4288:     my $answer = $self->answerdate($part);
                   4289: 
                   4290:     if (!$open && !$due && !$answer) {
                   4291:         # no data on the problem at all
                   4292:         # should this be the same as "open later"? think multipart.
                   4293:         return $self->NOTHING_SET;
                   4294:     }
1.59      bowersj2 4295:     if (!$open || $now < $open) {return $self->OPEN_LATER}
                   4296:     if (!$due || $now < $due) {return $self->OPEN}
                   4297:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
                   4298:     if ($answer) { return $self->ANSWER_OPEN; }
1.54      bowersj2 4299:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 4300: }
                   4301: 
                   4302: =pod
                   4303: 
                   4304: B<>
                   4305: 
                   4306: =over 4
                   4307: 
1.174     albertel 4308: =item * B<getCompletionStatus>($part):
1.51      bowersj2 4309: 
1.174     albertel 4310: ($part defaults to 0.) A convenience function that returns a symbolic
                   4311: constant telling you about the completion status of the part, with the
                   4312: following possible results:
                   4313: 
                   4314: =back
1.51      bowersj2 4315: 
                   4316: B<Completion Codes>
                   4317: 
                   4318: =over 4
                   4319: 
1.174     albertel 4320: =item * B<NOT_ATTEMPTED>:
                   4321: 
                   4322: Has not been attempted at all.
                   4323: 
                   4324: =item * B<INCORRECT>:
                   4325: 
                   4326: Attempted, but wrong by student.
1.51      bowersj2 4327: 
1.174     albertel 4328: =item * B<INCORRECT_BY_OVERRIDE>:
1.51      bowersj2 4329: 
1.174     albertel 4330: Attempted, but wrong by instructor override.
1.51      bowersj2 4331: 
1.174     albertel 4332: =item * B<CORRECT>:
1.51      bowersj2 4333: 
1.174     albertel 4334: Correct or correct by instructor.
1.51      bowersj2 4335: 
1.174     albertel 4336: =item * B<CORRECT_BY_OVERRIDE>:
1.51      bowersj2 4337: 
1.174     albertel 4338: Correct by instructor override.
1.51      bowersj2 4339: 
1.174     albertel 4340: =item * B<EXCUSED>:
                   4341: 
                   4342: Excused. Not yet implemented.
                   4343: 
                   4344: =item * B<NETWORK_FAILURE>:
                   4345: 
                   4346: Information not available due to network failure.
                   4347: 
                   4348: =item * B<ATTEMPTED>:
                   4349: 
                   4350: Attempted, and not yet graded.
1.69      bowersj2 4351: 
1.51      bowersj2 4352: =back
                   4353: 
                   4354: =cut
                   4355: 
1.53      bowersj2 4356: sub NOT_ATTEMPTED         { return 10; }
                   4357: sub INCORRECT             { return 11; }
                   4358: sub INCORRECT_BY_OVERRIDE { return 12; }
                   4359: sub CORRECT               { return 13; }
                   4360: sub CORRECT_BY_OVERRIDE   { return 14; }
                   4361: sub EXCUSED               { return 15; }
1.69      bowersj2 4362: sub ATTEMPTED             { return 16; }
1.51      bowersj2 4363: 
                   4364: sub getCompletionStatus {
                   4365:     my $self = shift;
1.332     albertel 4366:     my $part = shift;
1.51      bowersj2 4367:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4368: 
1.332     albertel 4369:     my $status = $self->queryRestoreHash('solved', $part);
1.51      bowersj2 4370: 
1.251     www      4371:     # Left as separate if statements in case we ever do more with this
1.51      bowersj2 4372:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
1.288     albertel 4373:     if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
1.332     albertel 4374:     if ($status eq 'correct_by_override') {
                   4375: 	return $self->CORRECT_BY_OVERRIDE;
                   4376:     }
1.51      bowersj2 4377:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   4378:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   4379:     if ($status eq 'excused') {return $self->EXCUSED; }
1.69      bowersj2 4380:     if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51      bowersj2 4381:     return $self->NOT_ATTEMPTED;
1.108     bowersj2 4382: }
                   4383: 
                   4384: sub queryRestoreHash {
                   4385:     my $self = shift;
                   4386:     my $hashentry = shift;
                   4387:     my $part = shift;
1.185     bowersj2 4388:     $part = "0" if (!defined($part) || $part eq '');
1.108     bowersj2 4389:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4390: 
                   4391:     $self->getReturnHash();
                   4392: 
                   4393:     return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51      bowersj2 4394: }
                   4395: 
                   4396: =pod
                   4397: 
                   4398: B<Composite Status>
                   4399: 
1.174     albertel 4400: Along with directly returning the date or completion status, the
                   4401: resource object includes a convenience function B<status>() that will
                   4402: combine the two status tidbits into one composite status that can
1.191     bowersj2 4403: represent the status of the resource as a whole. This method represents
                   4404: the concept of the thing we want to display to the user on the nav maps
                   4405: screen, which is a combination of completion and open status. The precise logic is
1.174     albertel 4406: documented in the comments of the status method. The following results
                   4407: may be returned, all available as methods on the resource object
1.185     bowersj2 4408: ($res->NETWORK_FAILURE): In addition to the return values that match
                   4409: the date or completion status, this function can return "ANSWER_SUBMITTED"
                   4410: if that problemstatus parameter value is set to No, suppressing the
                   4411: incorrect/correct feedback.
1.51      bowersj2 4412: 
                   4413: =over 4
                   4414: 
1.174     albertel 4415: =item * B<NETWORK_FAILURE>:
                   4416: 
                   4417: The network has failed and the information is not available.
1.51      bowersj2 4418: 
1.174     albertel 4419: =item * B<NOTHING_SET>:
1.53      bowersj2 4420: 
1.174     albertel 4421: No dates have been set for this problem (part) at all. (Because only
                   4422: certain parts of a multi-part problem may be assigned, this can not be
                   4423: collapsed into "open later", as we do not know a given part will EVER
                   4424: be opened. For single part, this is the same as "OPEN_LATER".)
1.51      bowersj2 4425: 
1.174     albertel 4426: =item * B<CORRECT>:
1.51      bowersj2 4427: 
1.174     albertel 4428: For any reason at all, the part is considered correct.
1.54      bowersj2 4429: 
1.174     albertel 4430: =item * B<EXCUSED>:
1.51      bowersj2 4431: 
1.174     albertel 4432: For any reason at all, the problem is excused.
1.51      bowersj2 4433: 
1.174     albertel 4434: =item * B<PAST_DUE_NO_ANSWER>:
1.51      bowersj2 4435: 
1.174     albertel 4436: The problem is past due, not considered correct, and no answer date is
                   4437: set.
1.51      bowersj2 4438: 
1.174     albertel 4439: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4440: 
1.174     albertel 4441: The problem is past due, not considered correct, and an answer date in
                   4442: the future is set.
1.51      bowersj2 4443: 
1.174     albertel 4444: =item * B<ANSWER_OPEN>:
                   4445: 
                   4446: The problem is past due, not correct, and the answer is now available.
                   4447: 
                   4448: =item * B<OPEN_LATER>:
                   4449: 
                   4450: The problem is not yet open.
                   4451: 
                   4452: =item * B<TRIES_LEFT>:
                   4453: 
                   4454: The problem is open, has been tried, is not correct, but there are
                   4455: tries left.
                   4456: 
                   4457: =item * B<INCORRECT>:
                   4458: 
                   4459: The problem is open, and all tries have been used without getting the
                   4460: correct answer.
                   4461: 
                   4462: =item * B<OPEN>:
                   4463: 
                   4464: The item is open and not yet tried.
                   4465: 
                   4466: =item * B<ATTEMPTED>:
                   4467: 
                   4468: The problem has been attempted.
1.69      bowersj2 4469: 
1.185     bowersj2 4470: =item * B<ANSWER_SUBMITTED>:
                   4471: 
                   4472: An answer has been submitted, but the student should not see it.
                   4473: 
1.51      bowersj2 4474: =back
                   4475: 
                   4476: =cut
                   4477: 
1.185     bowersj2 4478: sub TRIES_LEFT       { return 20; }
                   4479: sub ANSWER_SUBMITTED { return 21; }
1.332     albertel 4480: sub PARTIALLY_CORRECT{ return 22; }
1.51      bowersj2 4481: 
                   4482: sub status {
                   4483:     my $self = shift;
                   4484:     my $part = shift;
                   4485:     if (!defined($part)) { $part = "0"; }
                   4486:     my $completionStatus = $self->getCompletionStatus($part);
                   4487:     my $dateStatus = $self->getDateStatus($part);
                   4488: 
                   4489:     # What we have is a two-dimensional matrix with 4 entries on one
                   4490:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 4491:     # plus network failure and "no date data at all".
1.51      bowersj2 4492: 
1.222     bowersj2 4493:     #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53      bowersj2 4494:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 4495: 
1.236     bowersj2 4496:     my $suppressFeedback = $self->problemstatus($part) eq 'no';
                   4497:     # If there's an answer date and we're past it, don't
                   4498:     # suppress the feedback; student should know
1.330     albertel 4499:     if ($self->duedate($part) && $self->duedate($part) < time() &&
                   4500: 	$self->answerdate($part) && $self->answerdate($part) < time()) {
1.236     bowersj2 4501: 	$suppressFeedback = 0;
                   4502:     }
1.185     bowersj2 4503: 
1.51      bowersj2 4504:     # There are a few whole rows we can dispose of:
1.53      bowersj2 4505:     if ($completionStatus == CORRECT ||
                   4506:         $completionStatus == CORRECT_BY_OVERRIDE ) {
1.332     albertel 4507: 	if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
                   4508: 	my $awarded=$self->awarded($part);
                   4509: 	if ($awarded < 1 && $awarded > 0) {
                   4510:             return PARTIALLY_CORRECT;
                   4511: 	} elsif ($awarded<1) {
                   4512: 	    return INCORRECT;
                   4513: 	}
                   4514: 	return CORRECT; 
1.69      bowersj2 4515:     }
                   4516: 
1.343     albertel 4517:     # If it's WRONG... and not open
                   4518:     if ( ($completionStatus == INCORRECT || 
                   4519: 	  $completionStatus == INCORRECT_BY_OVERRIDE)
                   4520: 	 && (!$self->opendate($part) ||  $self->opendate($part) > time()) ) {
                   4521: 	return INCORRECT;
                   4522:     }
                   4523: 
1.69      bowersj2 4524:     if ($completionStatus == ATTEMPTED) {
                   4525:         return ATTEMPTED;
1.53      bowersj2 4526:     }
                   4527: 
                   4528:     # If it's EXCUSED, then return that no matter what
                   4529:     if ($completionStatus == EXCUSED) {
                   4530:         return EXCUSED; 
1.51      bowersj2 4531:     }
                   4532: 
1.53      bowersj2 4533:     if ($dateStatus == NOTHING_SET) {
                   4534:         return NOTHING_SET;
1.51      bowersj2 4535:     }
                   4536: 
1.69      bowersj2 4537:     # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
                   4538:     # by 4 matrix (date statuses).
1.51      bowersj2 4539: 
1.54      bowersj2 4540:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59      bowersj2 4541:         $dateStatus == PAST_DUE_NO_ANSWER ) {
1.272     albertel 4542:         return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus; 
1.51      bowersj2 4543:     }
                   4544: 
1.53      bowersj2 4545:     if ($dateStatus == ANSWER_OPEN) {
                   4546:         return ANSWER_OPEN;
1.51      bowersj2 4547:     }
                   4548: 
                   4549:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   4550:     # (open_later), (open)
                   4551:     
1.53      bowersj2 4552:     if ($dateStatus == OPEN_LATER) {
                   4553:         return OPEN_LATER;
1.51      bowersj2 4554:     }
                   4555: 
                   4556:     # If it's WRONG...
1.53      bowersj2 4557:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 4558:         # and there are TRIES LEFT:
1.79      bowersj2 4559:         if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222     bowersj2 4560:             return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51      bowersj2 4561:         }
1.185     bowersj2 4562:         return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 4563:     }
                   4564: 
                   4565:     # Otherwise, it's untried and open
1.53      bowersj2 4566:     return OPEN; 
1.224     bowersj2 4567: }
                   4568: 
                   4569: sub CLOSED { return 23; }
                   4570: sub ERROR { return 24; }
                   4571: 
                   4572: =pod
                   4573: 
                   4574: B<Simple Status>
                   4575: 
                   4576: Convenience method B<simpleStatus> provides a "simple status" for the resource.
                   4577: "Simple status" corresponds to "which icon is shown on the
                   4578: Navmaps". There are six "simple" statuses:
                   4579: 
                   4580: =over 4
                   4581: 
                   4582: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
                   4583: 
                   4584: =item * B<OPEN>: The problem is open and unattempted.
                   4585: 
                   4586: =item * B<CORRECT>: The problem is correct for any reason.
                   4587: 
                   4588: =item * B<INCORRECT>: The problem is incorrect and can still be
                   4589: completed successfully.
                   4590: 
                   4591: =item * B<ATTEMPTED>: The problem has been attempted, but the student
                   4592: does not know if they are correct. (The ellipsis icon.)
                   4593: 
                   4594: =item * B<ERROR>: There is an error retrieving information about this
                   4595: problem.
                   4596: 
                   4597: =back
                   4598: 
                   4599: =cut
                   4600: 
                   4601: # This hash maps the composite status to this simple status, and
                   4602: # can be used directly, if you like
                   4603: my %compositeToSimple = 
                   4604:     (
                   4605:       NETWORK_FAILURE()       => ERROR,
                   4606:       NOTHING_SET()           => CLOSED,
                   4607:       CORRECT()               => CORRECT,
1.332     albertel 4608:       PARTIALLY_CORRECT()     => PARTIALLY_CORRECT,
1.224     bowersj2 4609:       EXCUSED()               => CORRECT,
                   4610:       PAST_DUE_NO_ANSWER()    => INCORRECT,
                   4611:       PAST_DUE_ANSWER_LATER() => INCORRECT,
                   4612:       ANSWER_OPEN()           => INCORRECT,
                   4613:       OPEN_LATER()            => CLOSED,
                   4614:       TRIES_LEFT()            => OPEN,
                   4615:       INCORRECT()             => INCORRECT,
                   4616:       OPEN()                  => OPEN,
                   4617:       ATTEMPTED()             => ATTEMPTED,
                   4618:       ANSWER_SUBMITTED()      => ATTEMPTED
                   4619:      );
                   4620: 
                   4621: sub simpleStatus {
                   4622:     my $self = shift;
                   4623:     my $part = shift;
                   4624:     my $status = $self->status($part);
                   4625:     return $compositeToSimple{$status};
1.225     bowersj2 4626: }
                   4627: 
                   4628: =pod
                   4629: 
                   4630: B<simpleStatusCount> will return an array reference containing, in
                   4631: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
                   4632: and ERROR parts the given problem has.
                   4633: 
                   4634: =cut
                   4635:     
                   4636: # This maps the status to the slot we want to increment
                   4637: my %statusToSlotMap = 
                   4638:     (
                   4639:      OPEN()      => 0,
                   4640:      CLOSED()    => 1,
                   4641:      CORRECT()   => 2,
                   4642:      INCORRECT() => 3,
                   4643:      ATTEMPTED() => 4,
                   4644:      ERROR()     => 5
                   4645:      );
                   4646: 
                   4647: sub statusToSlot { return $statusToSlotMap{shift()}; }
                   4648: 
                   4649: sub simpleStatusCount {
                   4650:     my $self = shift;
                   4651: 
                   4652:     my @counts = (0, 0, 0, 0, 0, 0, 0);
                   4653:     foreach my $part (@{$self->parts()}) {
                   4654: 	$counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
                   4655:     }
                   4656: 
                   4657:     return \@counts;
1.191     bowersj2 4658: }
                   4659: 
                   4660: =pod
                   4661: 
                   4662: B<Completable>
                   4663: 
                   4664: The completable method represents the concept of I<whether the student can
                   4665: currently do the problem>. If the student can do the problem, which means
                   4666: that it is open, there are tries left, and if the problem is manually graded
                   4667: or the grade is suppressed via problemstatus, the student has not tried it
                   4668: yet, then the method returns 1. Otherwise, it returns 0, to indicate that 
                   4669: either the student has tried it and there is no feedback, or that for
                   4670: some reason it is no longer completable (not open yet, successfully completed,
                   4671: out of tries, etc.). As an example, this is used as the filter for the
                   4672: "Uncompleted Homework" option for the nav maps.
                   4673: 
                   4674: If this does not quite meet your needs, do not fiddle with it (unless you are
                   4675: fixing it to better match the student's conception of "completable" because
                   4676: it's broken somehow)... make a new method.
                   4677: 
                   4678: =cut
                   4679: 
                   4680: sub completable {
                   4681:     my $self = shift;
                   4682:     if (!$self->is_problem()) { return 0; }
                   4683:     my $partCount = $self->countParts();
                   4684: 
                   4685:     foreach my $part (@{$self->parts()}) {
                   4686:         if ($part eq '0' && $partCount != 1) { next; }
                   4687:         my $status = $self->status($part);
                   4688:         # "If any of the parts are open, or have tries left (implies open),
                   4689:         # and it is not "attempted" (manually graded problem), it is
                   4690:         # not "complete"
1.216     bowersj2 4691: 	if ($self->getCompletionStatus($part) == ATTEMPTED() ||
                   4692: 	    $status == ANSWER_SUBMITTED() ) {
                   4693: 	    # did this part already, as well as we can
                   4694: 	    next;
                   4695: 	}
                   4696: 	if ($status == OPEN() || $status == TRIES_LEFT()) {
                   4697: 	    return 1;
                   4698: 	}
1.191     bowersj2 4699:     }
                   4700:         
                   4701:     # If all the parts were complete, so was this problem.
1.216     bowersj2 4702:     return 0;
1.51      bowersj2 4703: }
                   4704: 
                   4705: =pod
                   4706: 
                   4707: =head2 Resource/Nav Map Navigation
                   4708: 
                   4709: =over 4
                   4710: 
1.174     albertel 4711: =item * B<getNext>():
                   4712: 
                   4713: Retreive an array of the possible next resources after this
                   4714: one. Always returns an array, even in the one- or zero-element case.
                   4715: 
                   4716: =item * B<getPrevious>():
1.85      bowersj2 4717: 
1.174     albertel 4718: Retreive an array of the possible previous resources from this
                   4719: one. Always returns an array, even in the one- or zero-element case.
1.51      bowersj2 4720: 
                   4721: =cut
                   4722: 
                   4723: sub getNext {
                   4724:     my $self = shift;
                   4725:     my @branches;
                   4726:     my $to = $self->to();
1.85      bowersj2 4727:     foreach my $branch ( split(/,/, $to) ) {
1.51      bowersj2 4728:         my $choice = $self->{NAV_MAP}->getById($branch);
1.342     albertel 4729:         #if (!$choice->condition()) { next; }
1.51      bowersj2 4730:         my $next = $choice->goesto();
                   4731:         $next = $self->{NAV_MAP}->getById($next);
                   4732: 
1.131     bowersj2 4733:         push @branches, $next;
1.85      bowersj2 4734:     }
                   4735:     return \@branches;
                   4736: }
                   4737: 
                   4738: sub getPrevious {
                   4739:     my $self = shift;
                   4740:     my @branches;
                   4741:     my $from = $self->from();
                   4742:     foreach my $branch ( split /,/, $from) {
                   4743:         my $choice = $self->{NAV_MAP}->getById($branch);
                   4744:         my $prev = $choice->comesfrom();
                   4745:         $prev = $self->{NAV_MAP}->getById($prev);
                   4746: 
1.131     bowersj2 4747:         push @branches, $prev;
1.51      bowersj2 4748:     }
                   4749:     return \@branches;
1.131     bowersj2 4750: }
                   4751: 
                   4752: sub browsePriv {
                   4753:     my $self = shift;
                   4754:     if (defined($self->{BROWSE_PRIV})) {
                   4755:         return $self->{BROWSE_PRIV};
                   4756:     }
                   4757: 
1.311     albertel 4758:     $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
                   4759: 						    $self->symb());
1.51      bowersj2 4760: }
                   4761: 
                   4762: =pod
1.2       www      4763: 
1.51      bowersj2 4764: =back
1.2       www      4765: 
1.51      bowersj2 4766: =cut
1.2       www      4767: 
1.51      bowersj2 4768: 1;
1.2       www      4769: 
1.51      bowersj2 4770: __END__
1.2       www      4771: 
                   4772: 

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