File:
[LON-CAPA] /
loncom /
interface /
lonnavmaps.pm
Revision
1.300:
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Thu Oct 7 22:12:47 2004 UTC (19 years, 8 months ago) by
albertel
Branches:
MAIN
CVS tags:
HEAD
- fixes bug#3350 hopefully for good.
- $navmaps objects never actaully got cleaned up due the resource objects in it holding a reference back to the navmap object, this meant the hashes didn't get untied and that we leaked memory
- needs WeakRef
1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.300 2004/10/07 22:12:47 albertel Exp $
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: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::loncommon();
35: use Apache::lonmenu();
36: use Apache::lonlocal;
37: use POSIX qw (floor strftime);
38: use Data::Dumper; # for debugging, not always
39:
40: # symbolic constants
41: sub SYMB { return 1; }
42: sub URL { return 2; }
43: sub NOTHING { return 3; }
44:
45: # Some data
46:
47: my $resObj = "Apache::lonnavmaps::resource";
48:
49: # Keep these mappings in sync with lonquickgrades, which uses the colors
50: # instead of the icons.
51: my %statusIconMap =
52: (
53: $resObj->CLOSED => '',
54: $resObj->OPEN => 'navmap.open.gif',
55: $resObj->CORRECT => 'navmap.correct.gif',
56: $resObj->INCORRECT => 'navmap.wrong.gif',
57: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
58: $resObj->ERROR => ''
59: );
60:
61: my %iconAltTags =
62: ( 'navmap.correct.gif' => 'Correct',
63: 'navmap.wrong.gif' => 'Incorrect',
64: 'navmap.open.gif' => 'Open' );
65:
66: # Defines a status->color mapping, null string means don't color
67: my %colormap =
68: ( $resObj->NETWORK_FAILURE => '',
69: $resObj->CORRECT => '',
70: $resObj->EXCUSED => '#3333FF',
71: $resObj->PAST_DUE_ANSWER_LATER => '',
72: $resObj->PAST_DUE_NO_ANSWER => '',
73: $resObj->ANSWER_OPEN => '#006600',
74: $resObj->OPEN_LATER => '',
75: $resObj->TRIES_LEFT => '',
76: $resObj->INCORRECT => '',
77: $resObj->OPEN => '',
78: $resObj->NOTHING_SET => '',
79: $resObj->ATTEMPTED => '',
80: $resObj->ANSWER_SUBMITTED => ''
81: );
82: # And a special case in the nav map; what to do when the assignment
83: # is not yet done and due in less then 24 hours
84: my $hurryUpColor = "#FF0000";
85:
86: sub launch_win {
87: my ($mode,$script,$toplinkitems)=@_;
88: my $result;
89: if ($script ne 'no') {
90: $result.='<script type="text/javascript">';
91: }
92: $result.='function launch_navmapwin() {
93: newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
94: }';
95: if ($mode eq 'now') {
96: $result.="\nlaunch_navmapwin();\n";
97: }
98: if ($script ne 'no') {
99: $result.='</script>';
100: }
101: if ($mode eq 'link') {
102: &add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
103: "Launch navigation window");
104: }
105: return $result;
106: }
107:
108: sub close {
109: if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
110: return(<<ENDCLOSE);
111: <script type="text/javascript">
112: window.status='Accessing Nav Control';
113: menu=window.open("/adm/rat/empty.html","loncapanav",
114: "height=600,width=400,scrollbars=1");
115: window.status='Closing Nav Control';
116: menu.close();
117: window.status='Done.';
118: </script>
119: ENDCLOSE
120: }
121:
122: sub nav_control_js {
123: my $nav=($ENV{'environment.remotenavmap'} eq 'on');
124: return (<<NAVCONTROL);
125: var w_loncapanav_flag="$nav";
126:
127:
128: function gonav(url) {
129: if (w_loncapanav_flag != 1) {
130: gopost(url,'');
131: } else {
132: navwindow=window.open(url,
133: "loncapanav","height=600,width=400,scrollbars=1");
134: }
135: }
136: NAVCONTROL
137: }
138:
139: sub update {
140: if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
141: if (!$ENV{'request.course.id'}) { return ''; }
142: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
143: return(<<ENDUPDATE);
144: <form name="navform"></form>
145: <script type="text/javascript">
146: this.document.navform.action='/adm/navmaps#curloc';
147: this.document.navform.target='loncapanav';
148: this.document.navform.submit();
149: </script>
150: ENDUPDATE
151: }
152:
153: sub handler {
154: my $r = shift;
155: real_handler($r);
156: }
157:
158: sub real_handler {
159: my $r = shift;
160:
161: # Handle header-only request
162: if ($r->header_only) {
163: if ($ENV{'browser.mathml'}) {
164: &Apache::loncommon::content_type($r,'text/xml');
165: } else {
166: &Apache::loncommon::content_type($r,'text/html');
167: }
168: $r->send_http_header;
169: return OK;
170: }
171:
172: # Send header, don't cache this page
173: if ($ENV{'browser.mathml'}) {
174: &Apache::loncommon::content_type($r,'text/xml');
175: } else {
176: &Apache::loncommon::content_type($r,'text/html');
177: }
178: &Apache::loncommon::no_cache($r);
179: $r->send_http_header;
180:
181: my %toplinkitems=();
182:
183: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
184: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
185: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
186: my $menu=&Apache::lonmenu::reopenmenu();
187: my $navstatus=&Apache::lonmenu::get_nav_status();
188: if ($menu) {
189: $menu=(<<MENU)
190: swmenu=$menu
191: swmenu.clearTimeout(swmenu.menucltim);
192: $navstatus
193: MENU
194: } else {
195: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
196: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
197: $menu=(<<MENU)
198: swmenu=$mainwindow
199: $navstatus
200: MENU
201: }
202: $r->print(<<"ENDSUBM");
203: <html>
204: <head>
205: <script type="text/javascript">
206: function submitthis() {
207: $menu
208: self.close();
209: }
210:
211: </script>
212: </head>
213: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
214: </html>
215: ENDSUBM
216: return;
217: }
218: if ($ENV{QUERY_STRING} eq 'launchExternal') {
219: &Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
220: &Apache::lonnet::appenv('environment.remotenavmap' => 'on');
221: }
222:
223: # Create the nav map
224: my $navmap = Apache::lonnavmaps::navmap->new();
225:
226: if (!defined($navmap)) {
227: my $requrl = $r->uri;
228: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
229: return HTTP_NOT_ACCEPTABLE;
230: }
231:
232: $r->print("<html><head>\n");
233: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
234: # ------------------------------------------------------------ Get query string
235: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework']);
236:
237: # ----------------------------------------------------- Force menu registration
238: my $addentries='';
239: my $more_unload;
240: my $body_only='';
241: if ($ENV{'environment.remotenavmap'} eq 'on') {
242: $r->print('<script type="text/javascript">
243: function collapse() {
244: this.document.location="/adm/navmaps?collapseExternal";
245: }
246: </script>');
247: # FIXME need to be smarter to only catch window close events
248: # $more_unload="collapse()"
249: $body_only=1;
250: }
251: if ($ENV{'form.register'}) {
252: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
253: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
254: $more_unload.'"';
255: $r->print(&Apache::lonmenu::registerurl(1));
256: } else {
257: $addentries=' onUnload="'.$more_unload.'"';
258: }
259:
260: # Header
261: $r->print('</head>'.
262: &Apache::loncommon::bodytag('Navigate Course Contents','',
263: $addentries,$body_only,'',
264: $ENV{'form.register'}));
265: $r->print('<script>window.focus();</script>');
266:
267: $r->rflush();
268:
269: # Check that it's defined
270: if (!($navmap->courseMapDefined())) {
271: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
272: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
273: '</body></html>');
274: return OK;
275: }
276:
277: # See if there's only one map in the top-level, if we don't
278: # already have a filter... if so, automatically display it
279: # (older code; should use retrieveResources)
280: if ($ENV{QUERY_STRING} !~ /filter/) {
281: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
282: my $curRes;
283: my $sequenceCount = 0;
284: my $sequenceId;
285: while ($curRes = $iterator->next()) {
286: if (ref($curRes) && $curRes->is_sequence()) {
287: $sequenceCount++;
288: $sequenceId = $curRes->map_pc();
289: }
290: }
291:
292: if ($sequenceCount == 1) {
293: # The automatic iterator creation in the render call
294: # will pick this up. We know the condition because
295: # the defined($ENV{'form.filter'}) also ensures this
296: # is a fresh call.
297: $ENV{'form.filter'} = "$sequenceId";
298: }
299: }
300:
301: if ($ENV{QUERY_STRING} eq 'launchExternal') {
302: $r->print('
303: <form name="returnwin" action="/adm/flip?postdata=return%3a"
304: method="post" target="loncapaclient">
305: </form>');
306: $r->print('
307: <script type="text/javascript">
308: this.document.returnwin.submit();
309: </script>');
310: }
311:
312: if ($ENV{'environment.remotenavmap'} ne 'on') {
313: $r->print(&launch_win('link','yes',\%toplinkitems));
314: }
315: if ($ENV{'environment.remotenavmap'} eq 'on') {
316: &add_linkitem(\%toplinkitems,'closenav','collapse()',
317: "Close navigation window");
318: }
319:
320: my $jumpToFirstHomework = 0;
321: # Check to see if the student is jumping to next open, do-able problem
322: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
323: $jumpToFirstHomework = 1;
324: # Find the next homework problem that they can do.
325: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
326: my $curRes;
327: my $foundDoableProblem = 0;
328: my $problemRes;
329:
330: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
331: if (ref($curRes) && $curRes->is_problem()) {
332: my $status = $curRes->status();
333: if ($curRes->completable()) {
334: $problemRes = $curRes;
335: $foundDoableProblem = 1;
336:
337: # Pop open all previous maps
338: my $stack = $iterator->getStack();
339: pop @$stack; # last resource in the stack is the problem
340: # itself, which we don't need in the map stack
341: my @mapPcs = map {$_->map_pc()} @$stack;
342: $ENV{'form.filter'} = join(',', @mapPcs);
343:
344: # Mark as both "here" and "jump"
345: $ENV{'form.postsymb'} = $curRes->symb();
346: }
347: }
348: }
349:
350: # If we found no problems, print a note to that effect.
351: if (!$foundDoableProblem) {
352: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
353: }
354: } else {
355: &add_linkitem(\%toplinkitems,'firsthomework',
356: 'location.href="navmaps?jumpToFirstHomework"',
357: "Show Me My First Homework Problem");
358: }
359:
360: my $suppressEmptySequences = 0;
361: my $filterFunc = undef;
362: my $resource_no_folder_link = 0;
363:
364: # Display only due homework.
365: my $showOnlyHomework = 0;
366: if ($ENV{'form.showOnlyHomework'} eq "1") {
367: $showOnlyHomework = 1;
368: $suppressEmptySequences = 1;
369: $filterFunc = sub { my $res = shift;
370: return $res->completable() || $res->is_map();
371: };
372: &add_linkitem(\%toplinkitems,'everything',
373: 'location.href="navmaps?sort='.$ENV{'form.sort'}.'"',
374: "Show Everything");
375: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
376: $ENV{'form.filter'} = '';
377: $ENV{'form.condition'} = 1;
378: $resource_no_folder_link = 1;
379: } else {
380: &add_linkitem(\%toplinkitems,'uncompleted',
381: 'location.href="navmaps?sort='.$ENV{'form.sort'}.
382: '&showOnlyHomework=1"',
383: "Show Only Uncompleted Homework");
384: }
385:
386: my %selected=($ENV{'form.sort'} => 'selected=on');
387: my $sort_html=("<form>
388: <nobr>
389: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$ENV{'form.showOnlyHomework'}."\" />
390: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
391: <select name=\"sort\">
392: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
393: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
394: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
395: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has Discussion')."</option>
396: </select>
397: </nobr>
398: </form>");
399: # renderer call
400: my $renderArgs = { 'cols' => [0,1,2,3],
401: 'sort' => $ENV{'form.sort'},
402: 'url' => '/adm/navmaps',
403: 'navmap' => $navmap,
404: 'suppressNavmap' => 1,
405: 'suppressEmptySequences' => $suppressEmptySequences,
406: 'filterFunc' => $filterFunc,
407: 'resource_no_folder_link' => $resource_no_folder_link,
408: 'sort_html'=> $sort_html,
409: 'r' => $r,
410: 'caller' => 'navmapsdisplay',
411: 'linkitems' => \%toplinkitems};
412: my $render = render($renderArgs);
413:
414: # If no resources were printed, print a reassuring message so the
415: # user knows there was no error.
416: if ($renderArgs->{'counter'} == 0) {
417: if ($showOnlyHomework) {
418: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
419: } else { # both jumpToFirstHomework and normal use the same: course must be empty
420: $r->print("<p><font size='+1'>This course is empty.</font></p>");
421: }
422: }
423:
424: $r->print("</body></html>");
425: $r->rflush();
426:
427: return OK;
428: }
429:
430: # Convenience functions: Returns a string that adds or subtracts
431: # the second argument from the first hash, appropriate for the
432: # query string that determines which folders to recurse on
433: sub addToFilter {
434: my $hashIn = shift;
435: my $addition = shift;
436: my %hash = %$hashIn;
437: $hash{$addition} = 1;
438:
439: return join (",", keys(%hash));
440: }
441:
442: sub removeFromFilter {
443: my $hashIn = shift;
444: my $subtraction = shift;
445: my %hash = %$hashIn;
446:
447: delete $hash{$subtraction};
448: return join(",", keys(%hash));
449: }
450:
451: # Convenience function: Given a stack returned from getStack on the iterator,
452: # return the correct src() value.
453: # Later, this should add an anchor when we start putting anchors in pages.
454: sub getLinkForResource {
455: my $stack = shift;
456: my $res;
457:
458: # Check to see if there are any pages in the stack
459: foreach $res (@$stack) {
460: if (defined($res)) {
461: if ($res->is_page()) {
462: return $res->src();
463: }
464: # in case folder was skipped over as "only sequence"
465: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
466: if ($map=~/\.page$/) {
467: return &Apache::lonnet::clutter($map).'#'.
468: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
469: }
470: }
471: }
472:
473: # Failing that, return the src of the last resource that is defined
474: # (when we first recurse on a map, it puts an undefined resource
475: # on the bottom because $self->{HERE} isn't defined yet, and we
476: # want the src for the map anyhow)
477: foreach (@$stack) {
478: if (defined($_)) { $res = $_; }
479: }
480:
481: return $res->src();
482: }
483:
484: # Convenience function: This separates the logic of how to create
485: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
486: # etc.) into a separate function. It takes a resource object as the
487: # first parameter, and the part number of the resource as the second.
488: # It's basically a big switch statement on the status of the resource.
489:
490: sub getDescription {
491: my $res = shift;
492: my $part = shift;
493: my $status = $res->status($part);
494:
495: if ($status == $res->NETWORK_FAILURE) {
496: return &mt("Having technical difficulties; please check status later");
497: }
498: if ($status == $res->NOTHING_SET) {
499: return &mt("Not currently assigned.");
500: }
501: if ($status == $res->OPEN_LATER) {
502: return "Open " . timeToHumanString($res->opendate($part));
503: }
504: if ($status == $res->OPEN) {
505: if ($res->duedate($part)) {
506: return &mt("Due")." " .timeToHumanString($res->duedate($part));
507: } else {
508: return &mt("Open, no due date");
509: }
510: }
511: if ($status == $res->PAST_DUE_ANSWER_LATER) {
512: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
513: }
514: if ($status == $res->PAST_DUE_NO_ANSWER) {
515: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
516: }
517: if ($status == $res->ANSWER_OPEN) {
518: return &mt("Answer available");
519: }
520: if ($status == $res->EXCUSED) {
521: return &mt("Excused by instructor");
522: }
523: if ($status == $res->ATTEMPTED) {
524: return &mt("Answer submitted, not yet graded");
525: }
526: if ($status == $res->TRIES_LEFT) {
527: my $tries = $res->tries($part);
528: my $maxtries = $res->maxtries($part);
529: my $triesString = "";
530: if ($tries && $maxtries) {
531: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
532: if ($maxtries > 1 && $maxtries - $tries == 1) {
533: $triesString = "<b>$triesString</b>";
534: }
535: }
536: if ($res->duedate($part)) {
537: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
538: " $triesString";
539: } else {
540: return &mt("No due date")." $triesString";
541: }
542: }
543: if ($status == $res->ANSWER_SUBMITTED) {
544: return &mt('Answer submitted');
545: }
546: }
547:
548: # Convenience function, so others can use it: Is the problem due in less then
549: # 24 hours, and still can be done?
550:
551: sub dueInLessThan24Hours {
552: my $res = shift;
553: my $part = shift;
554: my $status = $res->status($part);
555:
556: return ($status == $res->OPEN() ||
557: $status == $res->TRIES_LEFT()) &&
558: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
559: $res->duedate($part) > time();
560: }
561:
562: # Convenience function, so others can use it: Is there only one try remaining for the
563: # part, with more then one try to begin with, not due yet and still can be done?
564: sub lastTry {
565: my $res = shift;
566: my $part = shift;
567:
568: my $tries = $res->tries($part);
569: my $maxtries = $res->maxtries($part);
570: return $tries && $maxtries && $maxtries > 1 &&
571: $maxtries - $tries == 1 && $res->duedate($part) &&
572: $res->duedate($part) > time();
573: }
574:
575: # This puts a human-readable name on the ENV variable.
576:
577: sub advancedUser {
578: return $ENV{'request.role.adv'};
579: }
580:
581:
582: # timeToHumanString takes a time number and converts it to a
583: # human-readable representation, meant to be used in the following
584: # manner:
585: # print "Due $timestring"
586: # print "Open $timestring"
587: # print "Answer available $timestring"
588: # Very, very, very, VERY English-only... goodness help a localizer on
589: # this func...
590: sub timeToHumanString {
591: my ($time) = @_;
592: # zero, '0' and blank are bad times
593: if (!$time) {
594: return &mt('never');
595: }
596: unless (&Apache::lonlocal::current_language()=~/^en/) {
597: return &Apache::lonlocal::locallocaltime($time);
598: }
599: my $now = time();
600:
601: my @time = localtime($time);
602: my @now = localtime($now);
603:
604: # Positive = future
605: my $delta = $time - $now;
606:
607: my $minute = 60;
608: my $hour = 60 * $minute;
609: my $day = 24 * $hour;
610: my $week = 7 * $day;
611: my $inPast = 0;
612:
613: # Logic in comments:
614: # Is it now? (extremely unlikely)
615: if ( $delta == 0 ) {
616: return "this instant";
617: }
618:
619: if ($delta < 0) {
620: $inPast = 1;
621: $delta = -$delta;
622: }
623:
624: if ( $delta > 0 ) {
625:
626: my $tense = $inPast ? " ago" : "";
627: my $prefix = $inPast ? "" : "in ";
628:
629: # Less then a minute
630: if ( $delta < $minute ) {
631: if ($delta == 1) { return "${prefix}1 second$tense"; }
632: return "$prefix$delta seconds$tense";
633: }
634:
635: # Less then an hour
636: if ( $delta < $hour ) {
637: # If so, use minutes
638: my $minutes = floor($delta / 60);
639: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
640: return "$prefix$minutes minutes$tense";
641: }
642:
643: # Is it less then 24 hours away? If so,
644: # display hours + minutes
645: if ( $delta < $hour * 24) {
646: my $hours = floor($delta / $hour);
647: my $minutes = floor(($delta % $hour) / $minute);
648: my $hourString = "$hours hours";
649: my $minuteString = ", $minutes minutes";
650: if ($hours == 1) {
651: $hourString = "1 hour";
652: }
653: if ($minutes == 1) {
654: $minuteString = ", 1 minute";
655: }
656: if ($minutes == 0) {
657: $minuteString = "";
658: }
659: return "$prefix$hourString$minuteString$tense";
660: }
661:
662: # Less then 5 days away, display day of the week and
663: # HH:MM
664: if ( $delta < $day * 5 ) {
665: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
666: $timeStr =~ s/12:00 am/00:00/;
667: $timeStr =~ s/12:00 pm/noon/;
668: return ($inPast ? "last " : "next ") .
669: $timeStr;
670: }
671:
672: # Is it this year?
673: if ( $time[5] == $now[5]) {
674: # Return on Month Day, HH:MM meridian
675: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
676: $timeStr =~ s/12:00 am/00:00/;
677: $timeStr =~ s/12:00 pm/noon/;
678: return $timeStr;
679: }
680:
681: # Not this year, so show the year
682: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
683: $timeStr =~ s/12:00 am/00:00/;
684: $timeStr =~ s/12:00 pm/noon/;
685: return $timeStr;
686: }
687: }
688:
689:
690: =pod
691:
692: =head1 NAME
693:
694: Apache::lonnavmap - Subroutines to handle and render the navigation
695: maps
696:
697: =head1 SYNOPSIS
698:
699: The main handler generates the navigational listing for the course,
700: the other objects export this information in a usable fashion for
701: other modules.
702:
703: =head1 OVERVIEW
704:
705: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
706: course structure and caches it in what is often referred to as the
707: "big hash" X<big hash>. You can see it if you are logged into
708: LON-CAPA, in a course, by going to /adm/test. (You may need to
709: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
710: content of the hash will be under the heading "Big Hash".
711:
712: Big Hash contains, among other things, how resources are related
713: to each other (next/previous), what resources are maps, which
714: resources are being chosen to not show to the student (for random
715: selection), and a lot of other things that can take a lot of time
716: to compute due to the amount of data that needs to be collected and
717: processed.
718:
719: Apache::lonnavmaps provides an object model for manipulating this
720: information in a higher-level fashion then directly manipulating
721: the hash. It also provides access to several auxilary functions
722: that aren't necessarily stored in the Big Hash, but are a per-
723: resource sort of value, like whether there is any feedback on
724: a given resource.
725:
726: Apache::lonnavmaps also abstracts away branching, and someday,
727: conditions, for the times where you don't really care about those
728: things.
729:
730: Apache::lonnavmaps also provides fairly powerful routines for
731: rendering navmaps, and last but not least, provides the navmaps
732: view for when the user clicks the NAV button.
733:
734: B<Note>: Apache::lonnavmaps I<only> works for the "currently
735: logged in user"; if you want things like "due dates for another
736: student" lonnavmaps can not directly retrieve information like
737: that. You need the EXT function. This module can still help,
738: because many things, such as the course structure, are constant
739: between users, and Apache::lonnavmaps can help by providing
740: symbs for the EXT call.
741:
742: The rest of this file will cover the provided rendering routines,
743: which can often be used without fiddling with the navmap object at
744: all, then documents the Apache::lonnavmaps::navmap object, which
745: is the key to accessing the Big Hash information, covers the use
746: of the Iterator (which provides the logic for traversing the
747: somewhat-complicated Big Hash data structure), documents the
748: Apache::lonnavmaps::Resource objects that are returned by
749:
750: =head1 Subroutine: render
751:
752: The navmap renderer package provides a sophisticated rendering of the
753: standard navigation maps interface into HTML. The provided nav map
754: handler is actually just a glorified call to this.
755:
756: Because of the large number of parameters this function accepts,
757: instead of passing it arguments as is normal, pass it in an anonymous
758: hash with the desired options.
759:
760: The package provides a function called 'render', called as
761: Apache::lonnavmaps::render({}).
762:
763: =head2 Overview of Columns
764:
765: The renderer will build an HTML table for the navmap and return
766: it. The table is consists of several columns, and a row for each
767: resource (or possibly each part). You tell the renderer how many
768: columns to create and what to place in each column, optionally using
769: one or more of the prepared columns, and the renderer will assemble
770: the table.
771:
772: Any additional generally useful column types should be placed in the
773: renderer code here, so anybody can use it anywhere else. Any code
774: specific to the current application (such as the addition of <input>
775: elements in a column) should be placed in the code of the thing using
776: the renderer.
777:
778: At the core of the renderer is the array reference COLS (see Example
779: section below for how to pass this correctly). The COLS array will
780: consist of entries of one of two types of things: Either an integer
781: representing one of the pre-packaged column types, or a sub reference
782: that takes a resource reference, a part number, and a reference to the
783: argument hash passed to the renderer, and returns a string that will
784: be inserted into the HTML representation as it.
785:
786: All other parameters are ways of either changing how the columns
787: are printing, or which rows are shown.
788:
789: The pre-packaged column names are refered to by constants in the
790: Apache::lonnavmaps namespace. The following currently exist:
791:
792: =over 4
793:
794: =item * B<Apache::lonnavmaps::resource>:
795:
796: The general info about the resource: Link, icon for the type, etc. The
797: first column in the standard nav map display. This column provides the
798: indentation effect seen in the B<NAV> screen. This column also accepts
799: the following parameters in the renderer hash:
800:
801: =over 4
802:
803: =item * B<resource_nolink>: default false
804:
805: If true, the resource will not be linked. By default, all non-folder
806: resources are linked.
807:
808: =item * B<resource_part_count>: default true
809:
810: If true, the resource will show a part count B<if> the full
811: part list is not displayed. (See "condense_parts" later.) If false,
812: the resource will never show a part count.
813:
814: =item * B<resource_no_folder_link>:
815:
816: If true, the resource's folder will not be clickable to open or close
817: it. Default is false. True implies printCloseAll is false, since you
818: can't close or open folders when this is on anyhow.
819:
820: =back
821:
822: =item * B<Apache::lonnavmaps::communication_status>:
823:
824: Whether there is discussion on the resource, email for the user, or
825: (lumped in here) perl errors in the execution of the problem. This is
826: the second column in the main nav map.
827:
828: =item * B<Apache::lonnavmaps::quick_status>:
829:
830: An icon for the status of a problem, with five possible states:
831: Correct, incorrect, open, awaiting grading (for a problem where the
832: computer's grade is suppressed, or the computer can't grade, like
833: essay problem), or none (not open yet, not a problem). The
834: third column of the standard navmap.
835:
836: =item * B<Apache::lonnavmaps::long_status>:
837:
838: A text readout of the details of the current status of the problem,
839: such as "Due in 22 hours". The fourth column of the standard navmap.
840:
841: =item * B<Apache::lonnavmaps::part_status_summary>:
842:
843: A text readout summarizing the status of the problem. If it is a
844: single part problem, will display "Correct", "Incorrect",
845: "Not yet open", "Open", "Attempted", or "Error". If there are
846: multiple parts, this will output a string that in HTML will show a
847: status of how many parts are in each status, in color coding, trying
848: to match the colors of the icons within reason.
849:
850: Note this only makes sense if you are I<not> showing parts. If
851: C<showParts> is true (see below), this column will not output
852: anything.
853:
854: =back
855:
856: If you add any others please be sure to document them here.
857:
858: An example of a column renderer that will show the ID number of a
859: resource, along with the part name if any:
860:
861: sub {
862: my ($resource, $part, $params) = @_;
863: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
864: return '<td>' . $resource->{ID} . '</td>';
865: }
866:
867: Note these functions are responsible for the TD tags, which allow them
868: to override vertical and horizontal alignment, etc.
869:
870: =head2 Parameters
871:
872: Minimally, you should be
873: able to get away with just using 'cols' (to specify the columns
874: shown), 'url' (necessary for the folders to link to the current screen
875: correctly), and possibly 'queryString' if your app calls for it. In
876: that case, maintaining the state of the folders will be done
877: automatically.
878:
879: =over 4
880:
881: =item * B<iterator>: default: constructs one from %ENV
882:
883: A reference to a fresh ::iterator to use from the navmaps. The
884: rendering will reflect the options passed to the iterator, so you can
885: use that to just render a certain part of the course, if you like. If
886: one is not passed, the renderer will attempt to construct one from
887: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
888: 'iterator_map' parameter if any.
889:
890: =item * B<iterator_map>: default: not used
891:
892: If you are letting the renderer do the iterator handling, you can
893: instruct the renderer to render only a particular map by passing it
894: the source of the map you want to process, like
895: '/res/103/jerf/navmap.course.sequence'.
896:
897: =item * B<navmap>: default: constructs one from %ENV
898:
899: A reference to a navmap, used only if an iterator is not passed in. If
900: this is necessary to make an iterator but it is not passed in, a new
901: one will be constructed based on ENV info. This is useful to do basic
902: error checking before passing it off to render.
903:
904: =item * B<r>: default: must be passed in
905:
906: The standard Apache response object. This must be passed to the
907: renderer or the course hash will be locked.
908:
909: =item * B<cols>: default: empty (useless)
910:
911: An array reference
912:
913: =item * B<showParts>:default true
914:
915: A flag. If true, a line for the resource itself, and a line
916: for each part will be displayed. If not, only one line for each
917: resource will be displayed.
918:
919: =item * B<condenseParts>: default true
920:
921: A flag. If true, if all parts of the problem have the same
922: status and that status is Nothing Set, Correct, or Network Failure,
923: then only one line will be displayed for that resource anyhow. If no,
924: all parts will always be displayed. If showParts is 0, this is
925: ignored.
926:
927: =item * B<jumpCount>: default: determined from %ENV
928:
929: A string identifying the URL to place the anchor 'curloc' at.
930: It is the responsibility of the renderer user to
931: ensure that the #curloc is in the URL. By default, determined through
932: the use of the ENV{} 'jump' information, and should normally "just
933: work" correctly.
934:
935: =item * B<here>: default: empty string
936:
937: A Symb identifying where to place the 'here' marker. The empty
938: string means no marker.
939:
940: =item * B<indentString>: default: 25 pixel whitespace image
941:
942: A string identifying the indentation string to use.
943:
944: =item * B<queryString>: default: empty
945:
946: A string which will be prepended to the query string used when the
947: folders are opened or closed. You can use this to pass
948: application-specific values.
949:
950: =item * B<url>: default: none
951:
952: The url the folders will link to, which should be the current
953: page. Required if the resource info column is shown, and you
954: are allowing the user to open and close folders.
955:
956: =item * B<currentJumpIndex>: default: no jumping
957:
958: Describes the currently-open row number to cause the browser to jump
959: to, because the user just opened that folder. By default, pulled from
960: the Jump information in the ENV{'form.*'}.
961:
962: =item * B<printKey>: default: false
963:
964: If true, print the key that appears on the top of the standard
965: navmaps.
966:
967: =item * B<printCloseAll>: default: true
968:
969: If true, print the "Close all folders" or "open all folders"
970: links.
971:
972: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
973:
974: A function that takes the resource object as its only parameter and
975: returns a true or false value. If true, the resource is displayed. If
976: false, it is simply skipped in the display.
977:
978: =item * B<suppressEmptySequences>: default: false
979:
980: If you're using a filter function, and displaying sequences to orient
981: the user, then frequently some sequences will be empty. Setting this to
982: true will cause those sequences not to display, so as not to confuse the
983: user into thinking that if the sequence is there there should be things
984: under it; for example, see the "Show Uncompleted Homework" view on the
985: B<NAV> screen.
986:
987: =item * B<suppressNavmaps>: default: false
988:
989: If true, will not display Navigate Content resources.
990:
991: =back
992:
993: =head2 Additional Info
994:
995: In addition to the parameters you can pass to the renderer, which will
996: be passed through unchange to the column renderers, the renderer will
997: generate the following information which your renderer may find
998: useful:
999:
1000: =over 4
1001:
1002: =item * B<counter>:
1003:
1004: Contains the number of rows printed. Useful after calling the render
1005: function, as you can detect whether anything was printed at all.
1006:
1007: =item * B<isNewBranch>:
1008:
1009: Useful for renderers: If this resource is currently the first resource
1010: of a new branch, this will be true. The Resource column (leftmost in the
1011: navmaps screen) uses this to display the "new branch" icon
1012:
1013: =back
1014:
1015: =cut
1016:
1017: sub resource { return 0; }
1018: sub communication_status { return 1; }
1019: sub quick_status { return 2; }
1020: sub long_status { return 3; }
1021: sub part_status_summary { return 4; }
1022:
1023: sub render_resource {
1024: my ($resource, $part, $params) = @_;
1025:
1026: my $nonLinkedText = ''; # stuff after resource title not in link
1027:
1028: my $link = $params->{"resourceLink"};
1029: my $src = $resource->src();
1030: my $it = $params->{"iterator"};
1031: my $filter = $it->{FILTER};
1032:
1033: my $title = $resource->compTitle();
1034:
1035: my $partLabel = "";
1036: my $newBranchText = "";
1037: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1038: # If this is a new branch, label it so
1039: if ($params->{'isNewBranch'}) {
1040: $newBranchText = "<img src='$location/branch.gif' border='0' />";
1041: }
1042:
1043: # links to open and close the folder
1044: my $linkopen = "<a href='$link'>";
1045: my $linkclose = "</a>";
1046:
1047: # Default icon: unknown page
1048: my $icon = "<img src='$location/unknown.gif' alt='' border='0' />";
1049:
1050: if ($resource->is_problem()) {
1051: if ($part eq '0' || $params->{'condensed'}) {
1052: $icon ='<img src="'.$location.'/problem.gif" alt="" border="0" />';
1053: } else {
1054: $icon = $params->{'indentString'};
1055: }
1056: } else {
1057: $icon = "<img src='".&Apache::loncommon::lonhttpdurl(&Apache::loncommon::icon($resource->src))."' alt='' border='0' />";
1058: }
1059:
1060: # Display the correct map icon to open or shut map
1061: if ($resource->is_map()) {
1062: my $mapId = $resource->map_pc();
1063: my $nowOpen = !defined($filter->{$mapId});
1064: if ($it->{CONDITION}) {
1065: $nowOpen = !$nowOpen;
1066: }
1067:
1068: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1069:
1070: if (!$params->{'resource_no_folder_link'}) {
1071: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1072: $icon = "<img src='$location/$icon' alt='' border='0' />";
1073:
1074: $linkopen = "<a href='" . $params->{'url'} . '?' .
1075: $params->{'queryString'} . '&filter=';
1076: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1077: addToFilter($filter, $mapId) :
1078: removeFromFilter($filter, $mapId);
1079: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1080: . $params->{'hereType'} . '&here=' .
1081: &Apache::lonnet::escape($params->{'here'}) .
1082: '&jump=' .
1083: &Apache::lonnet::escape($resource->symb()) .
1084: "&folderManip=1'>";
1085: } else {
1086: # Don't allow users to manipulate folder
1087: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1088: '.nomanip.gif';
1089: $icon = "<img src='$location/$icon' alt='' border='0' />";
1090:
1091: $linkopen = "";
1092: $linkclose = "";
1093: }
1094: }
1095:
1096: if ($resource->randomout()) {
1097: $nonLinkedText .= ' <i>(hidden)</i> ';
1098: }
1099:
1100: # We're done preparing and finally ready to start the rendering
1101: my $result = "<td align='left' valign='center'>";
1102:
1103: my $indentLevel = $params->{'indentLevel'};
1104: if ($newBranchText) { $indentLevel--; }
1105:
1106: # print indentation
1107: for (my $i = 0; $i < $indentLevel; $i++) {
1108: $result .= $params->{'indentString'};
1109: }
1110:
1111: # Decide what to display
1112: $result .= "$newBranchText$linkopen$icon$linkclose";
1113:
1114: my $curMarkerBegin = '';
1115: my $curMarkerEnd = '';
1116:
1117: # Is this the current resource?
1118: if (!$params->{'displayedHereMarker'} &&
1119: $resource->symb() eq $params->{'here'} ) {
1120: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1121: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1122: $params->{'displayedHereMarker'} = 1;
1123: }
1124:
1125: if ($resource->is_problem() && $part ne '0' &&
1126: !$params->{'condensed'}) {
1127: my $displaypart=$resource->part_display($part);
1128: $partLabel = " (Part: $displaypart)";
1129: $link.='#'.&Apache::lonnet::escape($part);
1130: $title = "";
1131: }
1132:
1133: if ($params->{'condensed'} && $resource->countParts() > 1) {
1134: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1135: }
1136:
1137: my $target;
1138: if ($ENV{'environment.remotenavmap'} eq 'on') {
1139: $target=' target="loncapaclient" ';
1140: }
1141: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1142: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1143: } else {
1144: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1145: }
1146:
1147: return $result;
1148: }
1149:
1150: sub render_communication_status {
1151: my ($resource, $part, $params) = @_;
1152: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1153:
1154: my $link = $params->{"resourceLink"};
1155: my $linkopen = "<a href='$link'>";
1156: my $linkclose = "</a>";
1157: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1158: if ($resource->hasDiscussion()) {
1159: $discussionHTML = $linkopen .
1160: '<img border="0" src="'.$location.'/chat.gif" />' .
1161: $linkclose;
1162: }
1163:
1164: if ($resource->getFeedback()) {
1165: my $feedback = $resource->getFeedback();
1166: foreach (split(/\,/, $feedback)) {
1167: if ($_) {
1168: $feedbackHTML .= ' <a href="/adm/email?display='
1169: . &Apache::lonnet::escape($_) . '">'
1170: . '<img src="'.$location.'/feedback.gif" '
1171: . 'border="0" /></a>';
1172: }
1173: }
1174: }
1175:
1176: if ($resource->getErrors()) {
1177: my $errors = $resource->getErrors();
1178: my $errorcount = 0;
1179: foreach (split(/,/, $errors)) {
1180: last if ($errorcount>=10); # Only output 10 bombs maximum
1181: if ($_) {
1182: $errorcount++;
1183: $errorHTML .= ' <a href="/adm/email?display='
1184: . &Apache::lonnet::escape($_) . '">'
1185: . '<img src="'.$location.'/bomb.gif" '
1186: . 'border="0" /></a>';
1187: }
1188: }
1189: }
1190:
1191: if ($params->{'multipart'} && $part != '0') {
1192: $discussionHTML = $feedbackHTML = $errorHTML = '';
1193: }
1194:
1195: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1196:
1197: }
1198: sub render_quick_status {
1199: my ($resource, $part, $params) = @_;
1200: my $result = "";
1201: my $firstDisplayed = !$params->{'condensed'} &&
1202: $params->{'multipart'} && $part eq "0";
1203:
1204: my $link = $params->{"resourceLink"};
1205: my $linkopen = "<a href='$link'>";
1206: my $linkclose = "</a>";
1207:
1208: if ($resource->is_problem() &&
1209: !$firstDisplayed) {
1210:
1211: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1212: my $alt = $iconAltTags{$icon};
1213: if ($icon) {
1214: my $location=
1215: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1216: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1217: } else {
1218: $result .= "<td width='30'> </td>\n";
1219: }
1220: } else { # not problem, no icon
1221: $result .= "<td width='30'> </td>\n";
1222: }
1223:
1224: return $result;
1225: }
1226: sub render_long_status {
1227: my ($resource, $part, $params) = @_;
1228: my $result = "<td align='right' valign='center'>\n";
1229: my $firstDisplayed = !$params->{'condensed'} &&
1230: $params->{'multipart'} && $part eq "0";
1231:
1232: my $color;
1233: if ($resource->is_problem()) {
1234: $color = $colormap{$resource->status};
1235:
1236: if (dueInLessThan24Hours($resource, $part) ||
1237: lastTry($resource, $part)) {
1238: $color = $hurryUpColor;
1239: }
1240: }
1241:
1242: if ($resource->kind() eq "res" &&
1243: $resource->is_problem() &&
1244: !$firstDisplayed) {
1245: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1246: $result .= getDescription($resource, $part);
1247: if ($color) {$result .= "</b></font>"; }
1248: }
1249: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1250: $result .= '(randomly select ' . $resource->randompick() .')';
1251: }
1252:
1253: # Debugging code
1254: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1255: # ' - Part: ' . $part;
1256:
1257: $result .= "</td>\n";
1258:
1259: return $result;
1260: }
1261:
1262: # Colors obtained by taking the icons, matching the colors, and
1263: # possibly reducing the Value (HSV) of the color, if it's too bright
1264: # for text, generally by one third or so.
1265: my %statusColors =
1266: (
1267: $resObj->CLOSED => '#000000',
1268: $resObj->OPEN => '#998b13',
1269: $resObj->CORRECT => '#26933f',
1270: $resObj->INCORRECT => '#c48207',
1271: $resObj->ATTEMPTED => '#a87510',
1272: $resObj->ERROR => '#000000'
1273: );
1274: my %statusStrings =
1275: (
1276: $resObj->CLOSED => 'Not yet open',
1277: $resObj->OPEN => 'Open',
1278: $resObj->CORRECT => 'Correct',
1279: $resObj->INCORRECT => 'Incorrect',
1280: $resObj->ATTEMPTED => 'Attempted',
1281: $resObj->ERROR => 'Network Error'
1282: );
1283: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1284:
1285: use Data::Dumper;
1286: sub render_parts_summary_status {
1287: my ($resource, $part, $params) = @_;
1288: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1289: if ($params->{showParts}) {
1290: return '<td></td>';
1291: }
1292:
1293: my $td = "<td align='right'>\n";
1294: my $endtd = "</td>\n";
1295: my @probs;
1296:
1297: if ($resource->contains_problem) {
1298: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1299: } else {
1300: @probs=($resource);
1301: }
1302: my $return;
1303: my %overallstatus;
1304: my $totalParts;
1305: foreach my $resource (@probs) {
1306: # If there is a single part, just show the simple status
1307: if ($resource->singlepart()) {
1308: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1309: $overallstatus{$status}++;
1310: $totalParts++;
1311: next;
1312: }
1313: # Now we can be sure the $part doesn't really matter.
1314: my $statusCount = $resource->simpleStatusCount();
1315: my @counts;
1316: foreach my $status (@statuses) {
1317: # decouple display order from the simpleStatusCount order
1318: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1319: if ($statusCount->[$slot]) {
1320: $overallstatus{$status}+=$statusCount->[$slot];
1321: $totalParts+=$statusCount->[$slot];
1322: }
1323: }
1324: }
1325: $return.= $td . $totalParts . ' parts: ';
1326: foreach my $status (@statuses) {
1327: if ($overallstatus{$status}) {
1328: $return.="<font color='" . $statusColors{$status} .
1329: "'>" . $overallstatus{$status} . ' '
1330: . $statusStrings{$status} . "</font>";
1331: }
1332: }
1333: $return.= $endtd;
1334: return $return;
1335: }
1336:
1337: my @preparedColumns = (\&render_resource, \&render_communication_status,
1338: \&render_quick_status, \&render_long_status,
1339: \&render_parts_summary_status);
1340:
1341: sub setDefault {
1342: my ($val, $default) = @_;
1343: if (!defined($val)) { return $default; }
1344: return $val;
1345: }
1346:
1347: sub cmp_title {
1348: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1349: $atitle=~s/^\s*//;
1350: $btitle=~s/^\s*//;
1351: return $atitle cmp $btitle;
1352: }
1353:
1354: sub render {
1355: my $args = shift;
1356: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1357: my $result = '';
1358: # Configure the renderer.
1359: my $cols = $args->{'cols'};
1360: if (!defined($cols)) {
1361: # no columns, no nav maps.
1362: return '';
1363: }
1364: my $mustCloseNavMap = 0;
1365: my $navmap;
1366: if (defined($args->{'navmap'})) {
1367: $navmap = $args->{'navmap'};
1368: }
1369:
1370: my $r = $args->{'r'};
1371: my $queryString = $args->{'queryString'};
1372: my $jump = $args->{'jump'};
1373: my $here = $args->{'here'};
1374: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1375: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1376: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1377: # before the current resource when using #current
1378:
1379: # If we were passed 'here' information, we are not rendering
1380: # after a folder manipulation, and we were not passed an
1381: # iterator, make sure we open the folders to show the "here"
1382: # marker
1383: my $filterHash = {};
1384: # Figure out what we're not displaying
1385: foreach (split(/\,/, $ENV{"form.filter"})) {
1386: if ($_) {
1387: $filterHash->{$_} = "1";
1388: }
1389: }
1390:
1391: # Filter: Remember filter function and add our own filter: Refuse
1392: # to show hidden resources unless the user can see them.
1393: my $userCanSeeHidden = advancedUser();
1394: my $filterFunc = setDefault($args->{'filterFunc'},
1395: sub {return 1;});
1396: if (!$userCanSeeHidden) {
1397: # Without renaming the filterfunc, the server seems to go into
1398: # an infinite loop
1399: my $oldFilterFunc = $filterFunc;
1400: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1401: &$oldFilterFunc($res);};
1402: }
1403:
1404: my $condition = 0;
1405: if ($ENV{'form.condition'}) {
1406: $condition = 1;
1407: }
1408:
1409: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1410: # Step 1: Check to see if we have a navmap
1411: if (!defined($navmap)) {
1412: $navmap = Apache::lonnavmaps::navmap->new();
1413: $mustCloseNavMap = 1;
1414: }
1415:
1416: # Step two: Locate what kind of here marker is necessary
1417: # Determine where the "here" marker is and where the screen jumps to.
1418:
1419: if ($ENV{'form.postsymb'}) {
1420: $here = $jump = $ENV{'form.postsymb'};
1421: } elsif ($ENV{'form.postdata'}) {
1422: # couldn't find a symb, is there a URL?
1423: my $currenturl = $ENV{'form.postdata'};
1424: #$currenturl=~s/^http\:\/\///;
1425: #$currenturl=~s/^[^\/]+//;
1426:
1427: $here = $jump = &Apache::lonnet::symbread($currenturl);
1428: }
1429:
1430: # Step three: Ensure the folders are open
1431: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1432: my $curRes;
1433: my $found = 0;
1434:
1435: # We only need to do this if we need to open the maps to show the
1436: # current position. This will change the counter so we can't count
1437: # for the jump marker with this loop.
1438: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1439: if (ref($curRes) && $curRes->symb() eq $here) {
1440: my $mapStack = $mapIterator->getStack();
1441:
1442: # Ensure the parent maps are open
1443: for my $map (@{$mapStack}) {
1444: if ($condition) {
1445: undef $filterHash->{$map->map_pc()};
1446: } else {
1447: $filterHash->{$map->map_pc()} = 1;
1448: }
1449: }
1450: $found = 1;
1451: }
1452: }
1453: }
1454:
1455: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1456: # If this is a click on a folder or something, we want to preserve the "here"
1457: # from the querystring, and get the new "jump" marker
1458: $here = $ENV{'form.here'};
1459: $jump = $ENV{'form.jump'};
1460: }
1461:
1462: my $it = $args->{'iterator'};
1463: if (!defined($it)) {
1464: # Construct a default iterator based on $ENV{'form.'} information
1465:
1466: # Step 1: Check to see if we have a navmap
1467: if (!defined($navmap)) {
1468: $navmap = Apache::lonnavmaps::navmap->new();
1469: $mustCloseNavMap = 1;
1470: }
1471:
1472: # See if we're being passed a specific map
1473: if ($args->{'iterator_map'}) {
1474: my $map = $args->{'iterator_map'};
1475: $map = $navmap->getResourceByUrl($map);
1476: my $firstResource = $map->map_start();
1477: my $finishResource = $map->map_finish();
1478:
1479: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1480: } else {
1481: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1482: }
1483: }
1484:
1485: # (re-)Locate the jump point, if any
1486: # Note this does not take filtering or hidden into account... need
1487: # to be fixed?
1488: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1489: my $curRes;
1490: my $foundJump = 0;
1491: my $counter = 0;
1492:
1493: while (($curRes = $mapIterator->next()) && !$foundJump) {
1494: if (ref($curRes)) { $counter++; }
1495:
1496: if (ref($curRes) && $jump eq $curRes->symb()) {
1497:
1498: # This is why we have to use the main iterator instead of the
1499: # potentially faster DFS: The count has to be the same, so
1500: # the order has to be the same, which DFS won't give us.
1501: $args->{'currentJumpIndex'} = $counter;
1502: $foundJump = 1;
1503: }
1504: }
1505:
1506: my $showParts = setDefault($args->{'showParts'}, 1);
1507: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1508: # keeps track of when the current resource is found,
1509: # so we can back up a few and put the anchor above the
1510: # current resource
1511: my $printKey = $args->{'printKey'};
1512: my $printCloseAll = $args->{'printCloseAll'};
1513: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1514:
1515: # Print key?
1516: if ($printKey) {
1517: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1518: my $date=localtime;
1519: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1520: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1521: if ($navmap->{LAST_CHECK}) {
1522: $result .=
1523: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1524: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1525: '</td><td align="center" valign="bottom"> '.
1526: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1527: '</td>';
1528: } else {
1529: $result .= '<td align="center" valign="bottom"> '.
1530: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1531: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1532: '</td>';
1533: }
1534:
1535: $result .= '</tr></table>';
1536: }
1537:
1538: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1539: my ($link,$text);
1540: if ($condition) {
1541: $link='"navmaps?condition=0&filter=&'.$queryString.
1542: '&here='.&Apache::lonnet::escape($here).'"';
1543: $text='Close All Folders';
1544: } else {
1545: $link='"navmaps?condition=1&filter=&'.$queryString.
1546: '&here='.&Apache::lonnet::escape($here).'"';
1547: $text='Open All Folders';
1548: }
1549: if ($args->{'caller'} eq 'navmapsdisplay') {
1550: &add_linkitem($args->{'linkitems'},'changefolder',
1551: 'location.href='.$link,$text);
1552: } else {
1553: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1554: }
1555: $result .= "\n";
1556: }
1557:
1558: # Check for any unread discussions in all resources.
1559: if ($args->{'caller'} eq 'navmapsdisplay') {
1560: &add_linkitem($args->{'linkitems'},'clearbubbles',
1561: 'document.clearbubbles.submit()',
1562: 'Mark all posts read');
1563: my $time=time;
1564: $result .= (<<END);
1565: <form name="clearbubbles" method="post" action="/adm/feedback">
1566: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1567: <input type="hidden" name="navtime" value="$time" />
1568: END
1569: if ($args->{'sort'} eq 'discussion') {
1570: my $totdisc = 0;
1571: my $haveDisc = '';
1572: my @allres=$navmap->retrieveResources();
1573: foreach my $resource (@allres) {
1574: if ($resource->hasDiscussion()) {
1575: my $ressymb;
1576: if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
1577: $ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
1578: } else {
1579: $ressymb = $resource->symb();
1580: }
1581: $haveDisc .= $ressymb.':';
1582: $totdisc ++;
1583: }
1584: }
1585: if ($totdisc > 0) {
1586: $haveDisc =~ s/:$//;
1587: $result .= (<<END);
1588: <input type="hidden" name="navmaps" value="$haveDisc" />
1589: </form>
1590: END
1591: }
1592: }
1593: $result.='</form>';
1594: }
1595:
1596: if ($args->{'caller'} eq 'navmapsdisplay') {
1597: $result .= '<table><tr><td>'.
1598: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1599: if ($ENV{'environment.remotenavmap'} ne 'on') {
1600: $result .= '<td> </td>';
1601: } else {
1602: $result .= '</tr><tr>';
1603: }
1604: $result.=&show_linkitems($args->{'linkitems'});
1605: if ($args->{'sort_html'}) {
1606: if ($ENV{'environment.remotenavmap'} ne 'on') {
1607: $result.='<td> </td><td> </td><td> </td>'.
1608: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1609: } else {
1610: $result.='</tr><tr><td align="left"><br />'.
1611: $args->{'sort_html'}.'</td></tr>';
1612: }
1613: }
1614: $result .= '</table>';
1615: } elsif ($args->{'sort_html'}) {
1616: $result.=$args->{'sort_html'};
1617: }
1618:
1619: $result .= "<br />\n";
1620: if ($r) {
1621: $r->print($result);
1622: $r->rflush();
1623: $result = "";
1624: }
1625: # End parameter setting
1626:
1627: # Data
1628: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1629: my $res = "Apache::lonnavmaps::resource";
1630: my %condenseStatuses =
1631: ( $res->NETWORK_FAILURE => 1,
1632: $res->NOTHING_SET => 1,
1633: $res->CORRECT => 1 );
1634: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1635:
1636: # Shared variables
1637: $args->{'counter'} = 0; # counts the rows
1638: $args->{'indentLevel'} = 0;
1639: $args->{'isNewBranch'} = 0;
1640: $args->{'condensed'} = 0;
1641: my $location=
1642: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1643: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='' border='0' />");
1644: $args->{'displayedHereMarker'} = 0;
1645:
1646: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1647: # since structure actually doesn't matter, except what map has what resources.
1648: if ($args->{'suppressEmptySequences'}) {
1649: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1650: $it->{FIRST_RESOURCE},
1651: $it->{FINISH_RESOURCE},
1652: {}, undef, 1);
1653: my $depth = 0;
1654: $dfsit->next();
1655: my $curRes = $dfsit->next();
1656: while ($depth > -1) {
1657: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1658: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1659:
1660: if (ref($curRes)) {
1661: # Parallel pre-processing: Do sequences have non-filtered-out children?
1662: if ($curRes->is_map()) {
1663: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1664: # Sequences themselves do not count as visible children,
1665: # unless those sequences also have visible children.
1666: # This means if a sequence appears, there's a "promise"
1667: # that there's something under it if you open it, somewhere.
1668: } else {
1669: # Not a sequence: if it's filtered, ignore it, otherwise
1670: # rise up the stack and mark the sequences as having children
1671: if (&$filterFunc($curRes)) {
1672: for my $sequence (@{$dfsit->getStack()}) {
1673: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1674: }
1675: }
1676: }
1677: }
1678: } continue {
1679: $curRes = $dfsit->next();
1680: }
1681: }
1682:
1683: my $displayedJumpMarker = 0;
1684: # Set up iteration.
1685: my $now = time();
1686: my $in24Hours = $now + 24 * 60 * 60;
1687: my $rownum = 0;
1688:
1689: # export "here" marker information
1690: $args->{'here'} = $here;
1691:
1692: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1693: my @resources;
1694: my $code='';# sub { !(shift->is_map();) };
1695: if ($args->{'sort'} eq 'title') {
1696: my $oldFilterFunc = $filterFunc;
1697: my $filterFunc=
1698: sub {
1699: my ($res)=@_;
1700: if ($res->is_map()) { return 0;}
1701: return &$oldFilterFunc($res);
1702: };
1703: @resources=$navmap->retrieveResources(undef,$filterFunc);
1704: @resources= sort { &cmp_title($a,$b) } @resources;
1705: } elsif ($args->{'sort'} eq 'duedate') {
1706: my $oldFilterFunc = $filterFunc;
1707: my $filterFunc=
1708: sub {
1709: my ($res)=@_;
1710: if (!$res->is_problem()) { return 0;}
1711: return &$oldFilterFunc($res);
1712: };
1713: @resources=$navmap->retrieveResources(undef,$filterFunc);
1714: @resources= sort {
1715: if ($a->duedate ne $b->duedate) {
1716: return $a->duedate cmp $b->duedate;
1717: }
1718: my $value=&cmp_title($a,$b);
1719: return $value;
1720: } @resources;
1721: } elsif ($args->{'sort'} eq 'discussion') {
1722: my $oldFilterFunc = $filterFunc;
1723: my $filterFunc=
1724: sub {
1725: my ($res)=@_;
1726: if (!$res->hasDiscussion() &&
1727: !$res->getFeedback() &&
1728: !$res->getErrors()) { return 0;}
1729: return &$oldFilterFunc($res);
1730: };
1731: @resources=$navmap->retrieveResources(undef,$filterFunc);
1732: @resources= sort { &cmp_title($a,$b) } @resources;
1733: } else {
1734: #unknow sort mechanism or default
1735: undef($args->{'sort'});
1736: }
1737:
1738:
1739: while (1) {
1740: if ($args->{'sort'}) {
1741: $curRes = shift(@resources);
1742: } else {
1743: $curRes = $it->next($closeAllPages);
1744: }
1745: if (!$curRes) { last; }
1746:
1747: # Maintain indentation level.
1748: if ($curRes == $it->BEGIN_MAP() ||
1749: $curRes == $it->BEGIN_BRANCH() ) {
1750: $args->{'indentLevel'}++;
1751: }
1752: if ($curRes == $it->END_MAP() ||
1753: $curRes == $it->END_BRANCH() ) {
1754: $args->{'indentLevel'}--;
1755: }
1756: # Notice new branches
1757: if ($curRes == $it->BEGIN_BRANCH()) {
1758: $args->{'isNewBranch'} = 1;
1759: }
1760:
1761: # If this isn't an actual resource, continue on
1762: if (!ref($curRes)) {
1763: next;
1764: }
1765:
1766: # If this has been filtered out, continue on
1767: if (!(&$filterFunc($curRes))) {
1768: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1769: next;
1770: }
1771:
1772: # If this is an empty sequence and we're filtering them, continue on
1773: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1774: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1775: next;
1776: }
1777:
1778: # If we're suppressing navmaps and this is a navmap, continue on
1779: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1780: next;
1781: }
1782:
1783: $args->{'counter'}++;
1784:
1785: # Does it have multiple parts?
1786: $args->{'multipart'} = 0;
1787: $args->{'condensed'} = 0;
1788: my @parts;
1789:
1790: # Decide what parts to show.
1791: if ($curRes->is_problem() && $showParts) {
1792: @parts = @{$curRes->parts()};
1793: $args->{'multipart'} = $curRes->multipart();
1794:
1795: if ($condenseParts) { # do the condensation
1796: if (!$curRes->opendate("0")) {
1797: @parts = ();
1798: $args->{'condensed'} = 1;
1799: }
1800: if (!$args->{'condensed'}) {
1801: # Decide whether to condense based on similarity
1802: my $status = $curRes->status($parts[0]);
1803: my $due = $curRes->duedate($parts[0]);
1804: my $open = $curRes->opendate($parts[0]);
1805: my $statusAllSame = 1;
1806: my $dueAllSame = 1;
1807: my $openAllSame = 1;
1808: for (my $i = 1; $i < scalar(@parts); $i++) {
1809: if ($curRes->status($parts[$i]) != $status){
1810: $statusAllSame = 0;
1811: }
1812: if ($curRes->duedate($parts[$i]) != $due ) {
1813: $dueAllSame = 0;
1814: }
1815: if ($curRes->opendate($parts[$i]) != $open) {
1816: $openAllSame = 0;
1817: }
1818: }
1819: # $*allSame is true if all the statuses were
1820: # the same. Now, if they are all the same and
1821: # match one of the statuses to condense, or they
1822: # are all open with the same due date, or they are
1823: # all OPEN_LATER with the same open date, display the
1824: # status of the first non-zero part (to get the 'correct'
1825: # status right, since 0 is never 'correct' or 'open').
1826: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1827: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1828: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1829: @parts = ($parts[0]);
1830: $args->{'condensed'} = 1;
1831: }
1832: }
1833: # Multipart problem with one part: always "condense" (happens
1834: # to match the desirable behavior)
1835: if ($curRes->countParts() == 1) {
1836: @parts = ($parts[0]);
1837: $args->{'condensed'} = 1;
1838: }
1839: }
1840: }
1841:
1842: # If the multipart problem was condensed, "forget" it was multipart
1843: if (scalar(@parts) == 1) {
1844: $args->{'multipart'} = 0;
1845: } else {
1846: # Add part 0 so we display it correctly.
1847: unshift @parts, '0';
1848: }
1849:
1850: # Now, we've decided what parts to show. Loop through them and
1851: # show them.
1852: foreach my $part (@parts) {
1853: $rownum ++;
1854: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1855:
1856: $result .= " <tr bgcolor='$backgroundColor'>\n";
1857:
1858: # Set up some data about the parts that the cols might want
1859: my $filter = $it->{FILTER};
1860: my $src;
1861: if ($args->{'sort'}) {
1862: $src = $curRes->src(); # FIXME this is wrong for .pages
1863: } else {
1864: my $stack = $it->getStack();
1865: $src=getLinkForResource($stack);
1866: }
1867: my $anchor='';
1868: if ($src=~s/(\#.*)$//) {
1869: $anchor=$1;
1870: }
1871: my $srcHasQuestion = $src =~ /\?/;
1872: $args->{"resourceLink"} = $src.
1873: ($srcHasQuestion?'&':'?') .
1874: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1875: $anchor;
1876:
1877: # Now, display each column.
1878: foreach my $col (@$cols) {
1879: my $colHTML = '';
1880: if (ref($col)) {
1881: $colHTML .= &$col($curRes, $part, $args);
1882: } else {
1883: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1884: }
1885:
1886: # If this is the first column and it's time to print
1887: # the anchor, do so
1888: if ($col == $cols->[0] &&
1889: $args->{'counter'} == $args->{'currentJumpIndex'} -
1890: $currentJumpDelta) {
1891: # Jam the anchor after the <td> tag;
1892: # necessary for valid HTML (which Mozilla requires)
1893: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1894: $displayedJumpMarker = 1;
1895: }
1896: $result .= $colHTML . "\n";
1897: }
1898: $result .= " </tr>\n";
1899: $args->{'isNewBranch'} = 0;
1900: }
1901:
1902: if ($r && $rownum % 20 == 0) {
1903: $r->print($result);
1904: $result = "";
1905: $r->rflush();
1906: }
1907: } continue {
1908: if ($r) {
1909: # If we have the connection, make sure the user is still connected
1910: my $c = $r->connection;
1911: if ($c->aborted()) {
1912: # Who cares what we do, nobody will see it anyhow.
1913: return '';
1914: }
1915: }
1916: }
1917:
1918: # Print out the part that jumps to #curloc if it exists
1919: # delay needed because the browser is processing the jump before
1920: # it finishes rendering, so it goes to the wrong place!
1921: # onload might be better, but this routine has no access to that.
1922: # On mozilla, the 0-millisecond timeout seems to prevent this;
1923: # it's quite likely this might fix other browsers, too, and
1924: # certainly won't hurt anything.
1925: if ($displayedJumpMarker) {
1926: $result .= "
1927: <script>
1928: if (location.href.indexOf('#curloc')==-1) {
1929: setTimeout(\"location += '#curloc';\", 0)
1930: }
1931: </script>";
1932: }
1933:
1934: $result .= "</table>";
1935:
1936: if ($r) {
1937: $r->print($result);
1938: $result = "";
1939: $r->rflush();
1940: }
1941:
1942: return $result;
1943: }
1944:
1945: sub add_linkitem {
1946: my ($linkitems,$name,$cmd,$text)=@_;
1947: $$linkitems{$name}{'cmd'}=$cmd;
1948: $$linkitems{$name}{'text'}=&mt($text);
1949: }
1950:
1951: sub show_linkitems {
1952: my ($linkitems)=@_;
1953: my @linkorder = ("launchnav","closenav","firsthomework","everything",
1954: "uncompleted","changefolder","clearbubbles");
1955:
1956: my $result .= (<<ENDBLOCK);
1957: <td align="left">
1958: <script type="text/javascript">
1959: function changeNavDisplay () {
1960: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1961: ENDBLOCK
1962: foreach my $link (@linkorder) {
1963: $result.= "if (navchoice == '$link') {".
1964: $linkitems->{$link}{'cmd'}."}\n";
1965: }
1966: $result.='}
1967: </script>
1968: <form name="linkitems" method="post">
1969: <nobr><select name="toplink">'."\n";
1970: foreach my $link (@linkorder) {
1971: if (defined($linkitems->{$link})) {
1972: if ($linkitems->{$link}{'text'} ne '') {
1973: $result .= ' <option value="'.$link.'">'.
1974: $linkitems->{$link}{'text'}."</option>\n";
1975: }
1976: }
1977: }
1978: $result .= '</select> <input type="button" name="chgnav"
1979: value="Go" onClick="javascript:changeNavDisplay()" />
1980: </nobr></form></td>'."\n";
1981:
1982: return $result;
1983: }
1984:
1985: 1;
1986:
1987: package Apache::lonnavmaps::navmap;
1988:
1989: =pod
1990:
1991: =head1 Object: Apache::lonnavmaps::navmap
1992:
1993: =head2 Overview
1994:
1995: The navmap object's job is to provide access to the resources
1996: in the course as Apache::lonnavmaps::resource objects, and to
1997: query and manage the relationship between those resource objects.
1998:
1999: Generally, you'll use the navmap object in one of three basic ways.
2000: In order of increasing complexity and power:
2001:
2002: =over 4
2003:
2004: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2005: various ways to obtain resource objects, based on various identifiers.
2006: Use this when you want to request information about one object or
2007: a handful of resources you already know the identities of, from some
2008: other source. For more about Ids, Symbs, and MapPcs, see the
2009: Resource documentation. Note that Url should be a B<last resort>,
2010: not your first choice; it only works when there is only one
2011: instance of the resource in the course, which only applies to
2012: maps, and even that may change in the future.
2013:
2014: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2015: retrieves resources matching some criterion and returns them
2016: in a flat array, with no structure information. Use this when
2017: you are manipulating a series of resources, based on what map
2018: the are in, but do not care about branching, or exactly how
2019: the maps and resources are related. This is the most common case.
2020:
2021: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2022: the course's navmap in various ways without writing the traversal
2023: code yourself. See iterator documentation below. Use this when
2024: you need to know absolutely everything about the course, including
2025: branches and the precise relationship between maps and resources.
2026:
2027: =back
2028:
2029: =head2 Creation And Destruction
2030:
2031: To create a navmap object, use the following function:
2032:
2033: =over 4
2034:
2035: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2036:
2037: Creates a new navmap object. Returns the navmap object if this is
2038: successful, or B<undef> if not.
2039:
2040: =back
2041:
2042: =head2 Methods
2043:
2044: =over 4
2045:
2046: =item * B<getIterator>(first, finish, filter, condition):
2047:
2048: See iterator documentation below.
2049:
2050: =cut
2051:
2052: use strict;
2053: use GDBM_File;
2054:
2055: sub new {
2056: # magic invocation to create a class instance
2057: my $proto = shift;
2058: my $class = ref($proto) || $proto;
2059: my $self = {};
2060:
2061: # Resource cache stores navmap resources as we reference them. We generate
2062: # them on-demand so we don't pay for creating resources unless we use them.
2063: $self->{RESOURCE_CACHE} = {};
2064:
2065: # Network failure flag, if we accessed the course or user opt and
2066: # failed
2067: $self->{NETWORK_FAILURE} = 0;
2068:
2069: # tie the nav hash
2070:
2071: my %navmaphash;
2072: my %parmhash;
2073: my $courseFn = $ENV{"request.course.fn"};
2074: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2075: &GDBM_READER(), 0640))) {
2076: return undef;
2077: }
2078:
2079: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2080: &GDBM_READER(), 0640)))
2081: {
2082: untie %{$self->{PARM_HASH}};
2083: return undef;
2084: }
2085:
2086: $self->{NAV_HASH} = \%navmaphash;
2087: $self->{PARM_HASH} = \%parmhash;
2088: $self->{PARM_CACHE} = {};
2089:
2090: bless($self);
2091:
2092: return $self;
2093: }
2094:
2095: sub generate_course_user_opt {
2096: my $self = shift;
2097: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2098:
2099: my $uname=$ENV{'user.name'};
2100: my $udom=$ENV{'user.domain'};
2101: my $uhome=$ENV{'user.home'};
2102: my $cid=$ENV{'request.course.id'};
2103: my $chome=$ENV{'course.'.$cid.'.home'};
2104: my ($cdom,$cnum)=split(/\_/,$cid);
2105:
2106: my $userprefix=$uname.'_'.$udom.'_';
2107:
2108: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
2109: unless ($uhome eq 'no_host') {
2110: # ------------------------------------------------- Get coursedata (if present)
2111: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
2112: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
2113: ':resourcedata',$chome);
2114: # Check for network failure
2115: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
2116: $self->{NETWORK_FAILURE} = 1;
2117: } elsif ($reply!~/^error\:/) {
2118: $courserdatas{$cid}=$reply;
2119: $courserdatas{$cid.'.last_cache'}=time;
2120: }
2121: }
2122: foreach (split(/\&/,$courserdatas{$cid})) {
2123: my ($name,$value)=split(/\=/,$_);
2124: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
2125: &Apache::lonnet::unescape($value);
2126: }
2127: # --------------------------------------------------- Get userdata (if present)
2128: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
2129: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
2130: if ($reply!~/^error\:/) {
2131: $userrdatas{$uname.'___'.$udom}=$reply;
2132: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
2133: }
2134: # check to see if network failed
2135: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
2136: {
2137: $self->{NETWORK_FAILURE} = 1;
2138: }
2139: }
2140: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
2141: my ($name,$value)=split(/\=/,$_);
2142: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
2143: &Apache::lonnet::unescape($value);
2144: }
2145: $self->{COURSE_OPT} = \%courseopt;
2146: $self->{USER_OPT} = \%useropt;
2147: }
2148:
2149: $self->{COURSE_USER_OPT_GENERATED} = 1;
2150:
2151: return;
2152: }
2153:
2154: sub generate_email_discuss_status {
2155: my $self = shift;
2156: my $symb = shift;
2157: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2158:
2159: my $cid=$ENV{'request.course.id'};
2160: my ($cdom,$cnum)=split(/\_/,$cid);
2161:
2162: my %emailstatus = &Apache::lonnet::dump('email_status');
2163: my $logoutTime = $emailstatus{'logout'};
2164: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
2165: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2166: $courseLeaveTime : $logoutTime);
2167: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2168: $cdom, $cnum);
2169: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2170: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
2171: my %lastreadtime = ();
2172: foreach (keys %lastread) {
2173: my $key = $_;
2174: $key =~ s/_lastread$//;
2175: $lastreadtime{$key} = $lastread{$_};
2176: }
2177:
2178: my %feedback=();
2179: my %error=();
2180: my $keys = &Apache::lonnet::reply('keys:'.
2181: $ENV{'user.domain'}.':'.
2182: $ENV{'user.name'}.':nohist_email',
2183: $ENV{'user.home'});
2184:
2185: foreach my $msgid (split(/\&/, $keys)) {
2186: $msgid=&Apache::lonnet::unescape($msgid);
2187: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2188: my $plain=
2189: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2190: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2191: my ($what,$url)=($1,$2);
2192: if ($what eq 'Error') {
2193: $error{$url}.=','.$msgid;
2194: } else {
2195: $feedback{$url}.=','.$msgid;
2196: }
2197: }
2198: }
2199: }
2200:
2201: #url's of resources that have feedbacks
2202: $self->{FEEDBACK} = \%feedback;
2203: #or errors
2204: $self->{ERROR_MSG} = \%error;
2205: $self->{DISCUSSION_TIME} = \%discussiontime;
2206: $self->{EMAIL_STATUS} = \%emailstatus;
2207: $self->{LAST_READ} = \%lastreadtime;
2208:
2209: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2210: }
2211:
2212: sub get_user_data {
2213: my $self = shift;
2214: if ($self->{RETRIEVED_USER_DATA}) { return; }
2215:
2216: # Retrieve performance data on problems
2217: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
2218: $ENV{'user.domain'},
2219: $ENV{'user.name'});
2220: $self->{STUDENT_DATA} = \%student_data;
2221:
2222: $self->{RETRIEVED_USER_DATA} = 1;
2223: }
2224:
2225: # Internal function: Takes a key to look up in the nav hash and implements internal
2226: # memory caching of that key.
2227: sub navhash {
2228: my $self = shift; my $key = shift;
2229: return $self->{NAV_HASH}->{$key};
2230: }
2231:
2232: =pod
2233:
2234: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2235: false otherwise. Undefined course maps indicate an error somewhere in
2236: LON-CAPA, and you will not be able to proceed with using the navmap.
2237: See the B<NAV> screen for an example of using this.
2238:
2239: =cut
2240:
2241: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2242: sub courseMapDefined {
2243: my $self = shift;
2244: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
2245:
2246: my $firstres = $self->navhash("map_start_$uri");
2247: my $lastres = $self->navhash("map_finish_$uri");
2248: return $firstres && $lastres;
2249: }
2250:
2251: sub getIterator {
2252: my $self = shift;
2253: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2254: shift, undef, shift);
2255: return $iterator;
2256: }
2257:
2258: # Private method: Does the given resource (as a symb string) have
2259: # current discussion? Returns 0 if chat/mail data not extracted.
2260: sub hasDiscussion {
2261: my $self = shift;
2262: my $symb = shift;
2263:
2264: $self->generate_email_discuss_status();
2265:
2266: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2267:
2268: #return defined($self->{DISCUSSION_TIME}->{$symb});
2269:
2270: # backward compatibility (bulletin boards used to be 'wrapped')
2271: my $ressymb = $symb;
2272: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
2273: unless ($ressymb =~ m|adm/wrapper/adm|) {
2274: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
2275: }
2276: }
2277:
2278: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2279: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2280: } else {
2281: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2282: 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).
2283: }
2284: }
2285:
2286: # Private method: Does the given resource (as a symb string) have
2287: # current feedback? Returns the string in the feedback hash, which
2288: # will be false if it does not exist.
2289: sub getFeedback {
2290: my $self = shift;
2291: my $symb = shift;
2292:
2293: $self->generate_email_discuss_status();
2294:
2295: if (!defined($self->{FEEDBACK})) { return ""; }
2296:
2297: return $self->{FEEDBACK}->{$symb};
2298: }
2299:
2300: # Private method: Get the errors for that resource (by source).
2301: sub getErrors {
2302: my $self = shift;
2303: my $src = shift;
2304:
2305: $self->generate_email_discuss_status();
2306:
2307: if (!defined($self->{ERROR_MSG})) { return ""; }
2308: return $self->{ERROR_MSG}->{$src};
2309: }
2310:
2311: =pod
2312:
2313: =item * B<getById>(id):
2314:
2315: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2316: object for that resource. This method, or other methods that use it
2317: (as in the resource object) is the only proper way to obtain a
2318: resource object.
2319:
2320: =item * B<getBySymb>(symb):
2321:
2322: Based on the symb of the resource, get a resource object for that
2323: resource. This is one of the proper ways to get a resource object.
2324:
2325: =item * B<getMapByMapPc>(map_pc):
2326:
2327: Based on the map_pc of the resource, get a resource object for
2328: the given map. This is one of the proper ways to get a resource object.
2329:
2330: =cut
2331:
2332: # The strategy here is to cache the resource objects, and only construct them
2333: # as we use them. The real point is to prevent reading any more from the tied
2334: # hash then we have to, which should hopefully alleviate speed problems.
2335:
2336: sub getById {
2337: my $self = shift;
2338: my $id = shift;
2339:
2340: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2341: {
2342: return $self->{RESOURCE_CACHE}->{$id};
2343: }
2344:
2345: # resource handles inserting itself into cache.
2346: # Not clear why the quotes are necessary, but as of this
2347: # writing it doesn't work without them.
2348: return "Apache::lonnavmaps::resource"->new($self, $id);
2349: }
2350:
2351: sub getBySymb {
2352: my $self = shift;
2353: my $symb = shift;
2354:
2355: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2356: my $map = $self->getResourceByUrl($mapUrl);
2357: my $returnvalue = undef;
2358: if (ref($map)) {
2359: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2360: }
2361: return $returnvalue;
2362: }
2363:
2364: sub getByMapPc {
2365: my $self = shift;
2366: my $map_pc = shift;
2367: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2368: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2369: return $self->getById($map_id);
2370: }
2371:
2372: =pod
2373:
2374: =item * B<firstResource>():
2375:
2376: Returns a resource object reference corresponding to the first
2377: resource in the navmap.
2378:
2379: =cut
2380:
2381: sub firstResource {
2382: my $self = shift;
2383: my $firstResource = $self->navhash('map_start_' .
2384: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2385: return $self->getById($firstResource);
2386: }
2387:
2388: =pod
2389:
2390: =item * B<finishResource>():
2391:
2392: Returns a resource object reference corresponding to the last resource
2393: in the navmap.
2394:
2395: =cut
2396:
2397: sub finishResource {
2398: my $self = shift;
2399: my $firstResource = $self->navhash('map_finish_' .
2400: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2401: return $self->getById($firstResource);
2402: }
2403:
2404: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2405: # the actual lookup; parmval caches the results.
2406: sub parmval {
2407: my $self = shift;
2408: my ($what,$symb)=@_;
2409: my $hashkey = $what."|||".$symb;
2410:
2411: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2412: return $self->{PARM_CACHE}->{$hashkey};
2413: }
2414:
2415: my $result = $self->parmval_real($what, $symb);
2416: $self->{PARM_CACHE}->{$hashkey} = $result;
2417: return $result;
2418: }
2419:
2420: sub parmval_real {
2421: my $self = shift;
2422: my ($what,$symb,$recurse) = @_;
2423:
2424: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2425: $self->generate_course_user_opt();
2426:
2427: my $cid=$ENV{'request.course.id'};
2428: my $csec=$ENV{'request.course.sec'};
2429: my $uname=$ENV{'user.name'};
2430: my $udom=$ENV{'user.domain'};
2431:
2432: unless ($symb) { return ''; }
2433: my $result='';
2434:
2435: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2436:
2437: # ----------------------------------------------------- Cascading lookup scheme
2438: my $rwhat=$what;
2439: $what=~s/^parameter\_//;
2440: $what=~s/\_/\./;
2441:
2442: my $symbparm=$symb.'.'.$what;
2443: my $mapparm=$mapname.'___(all).'.$what;
2444: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2445:
2446: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2447: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2448: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2449:
2450: my $courselevel= $usercourseprefix.'.'.$what;
2451: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2452: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2453:
2454: my $useropt = $self->{USER_OPT};
2455: my $courseopt = $self->{COURSE_OPT};
2456: my $parmhash = $self->{PARM_HASH};
2457:
2458: # ---------------------------------------------------------- first, check user
2459: if ($uname and defined($useropt)) {
2460: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2461: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2462: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2463: }
2464:
2465: # ------------------------------------------------------- second, check course
2466: if ($csec and defined($courseopt)) {
2467: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2468: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2469: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2470: }
2471:
2472: if (defined($courseopt)) {
2473: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2474: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2475: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2476: }
2477:
2478: # ----------------------------------------------------- third, check map parms
2479:
2480: my $thisparm=$$parmhash{$symbparm};
2481: if (defined($thisparm)) { return $thisparm; }
2482:
2483: # ----------------------------------------------------- fourth , check default
2484:
2485: my $meta_rwhat=$rwhat;
2486: $meta_rwhat=~s/\./_/g;
2487: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2488: if (defined($default)) { return $default}
2489: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2490: if (defined($default)) { return $default}
2491:
2492: # --------------------------------------------------- fifth , cascade up parts
2493:
2494: my ($space,@qualifier)=split(/\./,$rwhat);
2495: my $qualifier=join('.',@qualifier);
2496: unless ($space eq '0') {
2497: my @parts=split(/_/,$space);
2498: my $id=pop(@parts);
2499: my $part=join('_',@parts);
2500: if ($part eq '') { $part='0'; }
2501: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2502: if (defined($partgeneral)) { return $partgeneral; }
2503: }
2504: if ($recurse) { return undef; }
2505: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2506: if (defined($pack_def)) { return $pack_def; }
2507: return '';
2508: }
2509:
2510: =pod
2511:
2512: =item * B<getResourceByUrl>(url):
2513:
2514: Retrieves a resource object by URL of the resource. If passed a
2515: resource object, it will simply return it, so it is safe to use this
2516: method in code like "$res = $navmap->getResourceByUrl($res)", if
2517: you're not sure if $res is already an object, or just a URL. If the
2518: resource appears multiple times in the course, only the first instance
2519: will be returned. As a result, this is probably useful only for maps.
2520:
2521: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2522:
2523: The map is a specification of a map to retreive the resources from,
2524: either as a url or as an object. The filterFunc is a reference to a
2525: function that takes a resource object as its one argument and returns
2526: true if the resource should be included, or false if it should not
2527: be. If recursive is true, the map will be recursively examined,
2528: otherwise it will not be. If bailout is true, the function will return
2529: as soon as it finds a resource, if false it will finish. By default,
2530: the map is the top-level map of the course, filterFunc is a function
2531: that always returns 1, recursive is true, bailout is false. The
2532: resources will be returned in a list containing the resource objects
2533: for the corresponding resources, with B<no structure information> in
2534: the list; regardless of branching, recursion, etc., it will be a flat
2535: list.
2536:
2537: Thus, this is suitable for cases where you don't want the structure,
2538: just a list of all resources. It is also suitable for finding out how
2539: many resources match a given description; for this use, if all you
2540: want to know is if I<any> resources match the description, the bailout
2541: parameter will allow you to avoid potentially expensive enumeration of
2542: all matching resources.
2543:
2544: =item * B<hasResource>(map, filterFunc, recursive):
2545:
2546: Convience method for
2547:
2548: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2549:
2550: which will tell whether the map has resources matching the description
2551: in the filter function.
2552:
2553: =cut
2554:
2555:
2556: sub getResourceByUrl {
2557: my $self = shift;
2558: my $resUrl = shift;
2559:
2560: if (ref($resUrl)) { return $resUrl; }
2561:
2562: $resUrl = &Apache::lonnet::clutter($resUrl);
2563: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2564: if ($resId =~ /,/) {
2565: $resId = (split (/,/, $resId))[0];
2566: }
2567: if (!$resId) { return ''; }
2568: return $self->getById($resId);
2569: }
2570:
2571: sub retrieveResources {
2572: my $self = shift;
2573: my $map = shift;
2574: my $filterFunc = shift;
2575: if (!defined ($filterFunc)) {
2576: $filterFunc = sub {return 1;};
2577: }
2578: my $recursive = shift;
2579: if (!defined($recursive)) { $recursive = 1; }
2580: my $bailout = shift;
2581: if (!defined($bailout)) { $bailout = 0; }
2582:
2583: # Create the necessary iterator.
2584: if (!ref($map)) { # assume it's a url of a map.
2585: $map = $self->getResourceByUrl($map);
2586: }
2587:
2588: # If nothing was passed, assume top-level map
2589: if (!$map) {
2590: $map = $self->getById('0.0');
2591: }
2592:
2593: # Check the map's validity.
2594: if (!$map->is_map()) {
2595: # Oh, to throw an exception.... how I'd love that!
2596: return ();
2597: }
2598:
2599: # Get an iterator.
2600: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2601: undef, $recursive);
2602:
2603: my @resources = ();
2604:
2605: # Run down the iterator and collect the resources.
2606: my $curRes;
2607:
2608: while ($curRes = $it->next()) {
2609: if (ref($curRes)) {
2610: if (!&$filterFunc($curRes)) {
2611: next;
2612: }
2613:
2614: push @resources, $curRes;
2615:
2616: if ($bailout) {
2617: return @resources;
2618: }
2619: }
2620:
2621: }
2622:
2623: return @resources;
2624: }
2625:
2626: sub hasResource {
2627: my $self = shift;
2628: my $map = shift;
2629: my $filterFunc = shift;
2630: my $recursive = shift;
2631:
2632: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2633: }
2634:
2635: 1;
2636:
2637: package Apache::lonnavmaps::iterator;
2638: use WeakRef;
2639: =pod
2640:
2641: =back
2642:
2643: =head1 Object: navmap Iterator
2644:
2645: An I<iterator> encapsulates the logic required to traverse a data
2646: structure. navmap uses an iterator to traverse the course map
2647: according to the criteria you wish to use.
2648:
2649: To obtain an iterator, call the B<getIterator>() function of a
2650: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2651: directly.) This will return a reference to the iterator:
2652:
2653: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2654:
2655: To get the next thing from the iterator, call B<next>:
2656:
2657: C<my $nextThing = $resourceIterator-E<gt>next()>
2658:
2659: getIterator behaves as follows:
2660:
2661: =over 4
2662:
2663: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2664:
2665: All parameters are optional. firstResource is a resource reference
2666: corresponding to where the iterator should start. It defaults to
2667: navmap->firstResource() for the corresponding nav map. finishResource
2668: corresponds to where you want the iterator to end, defaulting to
2669: navmap->finishResource(). filterHash is a hash used as a set
2670: containing strings representing the resource IDs, defaulting to
2671: empty. Condition is a 1 or 0 that sets what to do with the filter
2672: hash: If a 0, then only resources that exist IN the filterHash will be
2673: recursed on. If it is a 1, only resources NOT in the filterHash will
2674: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2675: false (default), the iterator will only return the first level of map
2676: that is not just a single, 'redirecting' map. If true, the iterator
2677: will return all information, starting with the top-level map,
2678: regardless of content. returnTopMap, if true (default false), will
2679: cause the iterator to return the top-level map object (resource 0.0)
2680: before anything else.
2681:
2682: Thus, by default, only top-level resources will be shown. Change the
2683: condition to a 1 without changing the hash, and all resources will be
2684: shown. Changing the condition to 1 and including some values in the
2685: hash will allow you to selectively suppress parts of the navmap, while
2686: leaving it on 0 and adding things to the hash will allow you to
2687: selectively add parts of the nav map. See the handler code for
2688: examples.
2689:
2690: The iterator will return either a reference to a resource object, or a
2691: token representing something in the map, such as the beginning of a
2692: new branch. The possible tokens are:
2693:
2694: =over 4
2695:
2696: =item * B<END_ITERATOR>:
2697:
2698: The iterator has returned all that it's going to. Further calls to the
2699: iterator will just produce more of these. This is a "false" value, and
2700: is the only false value the iterator which will be returned, so it can
2701: be used as a loop sentinel.
2702:
2703: =item * B<BEGIN_MAP>:
2704:
2705: A new map is being recursed into. This is returned I<after> the map
2706: resource itself is returned.
2707:
2708: =item * B<END_MAP>:
2709:
2710: The map is now done.
2711:
2712: =item * B<BEGIN_BRANCH>:
2713:
2714: A branch is now starting. The next resource returned will be the first
2715: in that branch.
2716:
2717: =item * B<END_BRANCH>:
2718:
2719: The branch is now done.
2720:
2721: =back
2722:
2723: The tokens are retreivable via methods on the iterator object, i.e.,
2724: $iterator->END_MAP.
2725:
2726: Maps can contain empty resources. The iterator will automatically skip
2727: over such resources, but will still treat the structure
2728: correctly. Thus, a complicated map with several branches, but
2729: consisting entirely of empty resources except for one beginning or
2730: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2731: but only one resource will be returned.
2732:
2733: =back
2734:
2735: =head2 Normal Usage
2736:
2737: Normal usage of the iterator object is to do the following:
2738:
2739: my $it = $navmap->getIterator([your params here]);
2740: my $curRes;
2741: while ($curRes = $it->next()) {
2742: [your logic here]
2743: }
2744:
2745: Note that inside of the loop, it's frequently useful to check if
2746: "$curRes" is a reference or not with the reference function; only
2747: resource objects will be references, and any non-references will
2748: be the tokens described above.
2749:
2750: Also note there is some old code floating around that trys to track
2751: the depth of the iterator to see when it's done; do not copy that
2752: code. It is difficult to get right and harder to understand then
2753: this. They should be migrated to this new style.
2754:
2755: =cut
2756:
2757: # Here are the tokens for the iterator:
2758:
2759: sub END_ITERATOR { return 0; }
2760: sub BEGIN_MAP { return 1; } # begining of a new map
2761: sub END_MAP { return 2; } # end of the map
2762: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2763: sub END_BRANCH { return 4; } # end of a branch
2764: sub FORWARD { return 1; } # go forward
2765: sub BACKWARD { return 2; }
2766:
2767: sub min {
2768: (my $a, my $b) = @_;
2769: if ($a < $b) { return $a; } else { return $b; }
2770: }
2771:
2772: sub new {
2773: # magic invocation to create a class instance
2774: my $proto = shift;
2775: my $class = ref($proto) || $proto;
2776: my $self = {};
2777:
2778: weaken($self->{NAV_MAP} = shift);
2779: return undef unless ($self->{NAV_MAP});
2780:
2781: # Handle the parameters
2782: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2783: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2784:
2785: # If the given resources are just the ID of the resource, get the
2786: # objects
2787: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2788: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2789: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2790: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2791:
2792: $self->{FILTER} = shift;
2793:
2794: # A hash, used as a set, of resource already seen
2795: $self->{ALREADY_SEEN} = shift;
2796: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2797: $self->{CONDITION} = shift;
2798:
2799: # Do we want to automatically follow "redirection" maps?
2800: $self->{FORCE_TOP} = shift;
2801:
2802: # Do we want to return the top-level map object (resource 0.0)?
2803: $self->{RETURN_0} = shift;
2804: # have we done that yet?
2805: $self->{HAVE_RETURNED_0} = 0;
2806:
2807: # Now, we need to pre-process the map, by walking forward and backward
2808: # over the parts of the map we're going to look at.
2809:
2810: # The processing steps are exactly the same, except for a few small
2811: # changes, so I bundle those up in the following list of two elements:
2812: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2813: # first_resource).
2814: # This prevents writing nearly-identical code twice.
2815: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2816: 'FIRST_RESOURCE'],
2817: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2818: 'FINISH_RESOURCE'] );
2819:
2820: my $maxDepth = 0; # tracks max depth
2821:
2822: # If there is only one resource in this map, and it's a map, we
2823: # want to remember that, so the user can ask for the first map
2824: # that isn't just a redirector.
2825: my $resource; my $resourceCount = 0;
2826:
2827: # Documentation on this algorithm can be found in the CVS repository at
2828: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2829: # in that file.
2830: # **1**
2831:
2832: foreach my $pass (@iterations) {
2833: my $direction = $pass->[0];
2834: my $valName = $pass->[1];
2835: my $nextResourceMethod = $pass->[2];
2836: my $firstResourceName = $pass->[3];
2837:
2838: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2839: $self->{FIRST_RESOURCE},
2840: $self->{FINISH_RESOURCE},
2841: {}, undef, 0, $direction);
2842:
2843: # prime the recursion
2844: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2845: $iterator->next();
2846: my $curRes = $iterator->next();
2847: my $depth = 1;
2848: while ($depth > 0) {
2849: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2850: if ($curRes == $iterator->END_MAP()) { $depth--; }
2851:
2852: if (ref($curRes)) {
2853: # If there's only one resource, this will save it
2854: # we have to filter empty resources from consideration here,
2855: # or even "empty", redirecting maps have two (start & finish)
2856: # or three (start, finish, plus redirector)
2857: if($direction == FORWARD && $curRes->src()) {
2858: $resource = $curRes; $resourceCount++;
2859: }
2860: my $resultingVal = $curRes->{DATA}->{$valName};
2861: my $nextResources = $curRes->$nextResourceMethod();
2862: my $nextCount = scalar(@{$nextResources});
2863:
2864: if ($nextCount == 1) { # **3**
2865: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2866: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2867: }
2868:
2869: if ($nextCount > 1) { # **4**
2870: foreach my $res (@{$nextResources}) {
2871: my $current = $res->{DATA}->{$valName} || 999999999;
2872: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2873: }
2874: }
2875: }
2876:
2877: # Assign the final val (**2**)
2878: if (ref($curRes) && $direction == BACKWARD()) {
2879: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2880: $curRes->{DATA}->{BOT_UP_VAL});
2881:
2882: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2883: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2884: }
2885:
2886: $curRes = $iterator->next();
2887: }
2888: }
2889:
2890: # Check: Was this only one resource, a map?
2891: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2892: my $firstResource = $resource->map_start();
2893: my $finishResource = $resource->map_finish();
2894: return
2895: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2896: $finishResource, $self->{FILTER},
2897: $self->{ALREADY_SEEN},
2898: $self->{CONDITION}, 0);
2899:
2900: }
2901:
2902: # Set up some bookkeeping information.
2903: $self->{CURRENT_DEPTH} = 0;
2904: $self->{MAX_DEPTH} = $maxDepth;
2905: $self->{STACK} = [];
2906: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2907: $self->{FINISHED} = 0; # When true, the iterator has finished
2908:
2909: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2910: push @{$self->{STACK}}, [];
2911: }
2912:
2913: # Prime the recursion w/ the first resource **5**
2914: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2915: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2916:
2917: bless ($self);
2918:
2919: return $self;
2920: }
2921:
2922: sub next {
2923: my $self = shift;
2924: my $closeAllPages=shift;
2925: if ($self->{FINISHED}) {
2926: return END_ITERATOR();
2927: }
2928:
2929: # If we want to return the top-level map object, and haven't yet,
2930: # do so.
2931: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2932: $self->{HAVE_RETURNED_0} = 1;
2933: return $self->{NAV_MAP}->getById('0.0');
2934: }
2935:
2936: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2937: # grab the next from the recursive iterator
2938: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2939:
2940: # is it a begin or end map? If so, update the depth
2941: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2942: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2943:
2944: # Are we back at depth 0? If so, stop recursing
2945: if ($self->{RECURSIVE_DEPTH} == 0) {
2946: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2947: }
2948:
2949: return $next;
2950: }
2951:
2952: if (defined($self->{FORCE_NEXT})) {
2953: my $tmp = $self->{FORCE_NEXT};
2954: $self->{FORCE_NEXT} = undef;
2955: return $tmp;
2956: }
2957:
2958: # Have we not yet begun? If not, return BEGIN_MAP and
2959: # remember we've started.
2960: if ( !$self->{STARTED} ) {
2961: $self->{STARTED} = 1;
2962: return $self->BEGIN_MAP();
2963: }
2964:
2965: # Here's the guts of the iterator.
2966:
2967: # Find the next resource, if any.
2968: my $found = 0;
2969: my $i = $self->{MAX_DEPTH};
2970: my $newDepth;
2971: my $here;
2972: while ( $i >= 0 && !$found ) {
2973: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2974: $here = pop @{$self->{STACK}->[$i]}; # **7**
2975: $found = 1;
2976: $newDepth = $i;
2977: }
2978: $i--;
2979: }
2980:
2981: # If we still didn't find anything, we're done.
2982: if ( !$found ) {
2983: # We need to get back down to the correct branch depth
2984: if ( $self->{CURRENT_DEPTH} > 0 ) {
2985: $self->{CURRENT_DEPTH}--;
2986: return END_BRANCH();
2987: } else {
2988: $self->{FINISHED} = 1;
2989: return END_MAP();
2990: }
2991: }
2992:
2993: # If this is not a resource, it must be an END_BRANCH marker we want
2994: # to return directly.
2995: if (!ref($here)) { # **8**
2996: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2997: $self->{CURRENT_DEPTH}--;
2998: return $here;
2999: }
3000: }
3001:
3002: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3003: $self->{HERE} = $here;
3004:
3005: # Get to the right level
3006: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3007: push @{$self->{STACK}->[$newDepth]}, $here;
3008: $self->{CURRENT_DEPTH}--;
3009: return END_BRANCH();
3010: }
3011: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3012: push @{$self->{STACK}->[$newDepth]}, $here;
3013: $self->{CURRENT_DEPTH}++;
3014: return BEGIN_BRANCH();
3015: }
3016:
3017: # If we made it here, we have the next resource, and we're at the
3018: # right branch level. So let's examine the resource for where
3019: # we can get to from here.
3020:
3021: # So we need to look at all the resources we can get to from here,
3022: # categorize them if we haven't seen them, remember if we have a new
3023: my $nextUnfiltered = $here->getNext();
3024: my $maxDepthAdded = -1;
3025:
3026: for (@$nextUnfiltered) {
3027: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3028: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3029: push @{$self->{STACK}->[$depth]}, $_;
3030: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3031: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3032: }
3033: }
3034:
3035: # Is this the end of a branch? If so, all of the resources examined above
3036: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3037: # marker onto the stack so we don't forget.
3038: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3039: # BC branch and gets to C, it will see F as the only next resource, but it's
3040: # one level lower. Thus, this is the end of the branch, since there are no
3041: # more resources added to this level or above.
3042: # We don't do this if the examined resource is the finish resource,
3043: # because the condition given above is true, but the "END_MAP" will
3044: # take care of things and we should already be at depth 0.
3045: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3046: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3047: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3048: }
3049:
3050: # That ends the main iterator logic. Now, do we want to recurse
3051: # down this map (if this resource is a map)?
3052: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3053: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3054: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3055: my $firstResource = $self->{HERE}->map_start();
3056: my $finishResource = $self->{HERE}->map_finish();
3057:
3058: $self->{RECURSIVE_ITERATOR} =
3059: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3060: $finishResource, $self->{FILTER},
3061: $self->{ALREADY_SEEN}, $self->{CONDITION});
3062: }
3063:
3064: # If this is a blank resource, don't actually return it.
3065: # Should you ever find you need it, make sure to add an option to the code
3066: # that you can use; other things depend on this behavior.
3067: my $browsePriv = $self->{HERE}->browsePriv();
3068: if (!$self->{HERE}->src() ||
3069: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3070: return $self->next($closeAllPages);
3071: }
3072:
3073: return $self->{HERE};
3074:
3075: }
3076:
3077: =pod
3078:
3079: The other method available on the iterator is B<getStack>, which
3080: returns an array populated with the current 'stack' of maps, as
3081: references to the resource objects. Example: This is useful when
3082: making the navigation map, as we need to check whether we are under a
3083: page map to see if we need to link directly to the resource, or to the
3084: page. The first elements in the array will correspond to the top of
3085: the stack (most inclusive map).
3086:
3087: =cut
3088:
3089: sub getStack {
3090: my $self=shift;
3091:
3092: my @stack;
3093:
3094: $self->populateStack(\@stack);
3095:
3096: return \@stack;
3097: }
3098:
3099: # Private method: Calls the iterators recursively to populate the stack.
3100: sub populateStack {
3101: my $self=shift;
3102: my $stack = shift;
3103:
3104: push @$stack, $self->{HERE} if ($self->{HERE});
3105:
3106: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3107: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3108: }
3109: }
3110:
3111: 1;
3112:
3113: package Apache::lonnavmaps::DFSiterator;
3114: use WeakRef;
3115: # Not documented in the perldoc: This is a simple iterator that just walks
3116: # through the nav map and presents the resources in a depth-first search
3117: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3118: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3119: # useful for pre-processing of some kind, and is in fact used by the main
3120: # iterator that way, but that's about it.
3121: # One could imagine merging this into the init routine of the main iterator,
3122: # but this might as well be left separate, since it is possible some other
3123: # use might be found for it. - Jeremy
3124:
3125: # Unlike the main iterator, this DOES return all resources, even blank ones.
3126: # The main iterator needs them to correctly preprocess the map.
3127:
3128: sub BEGIN_MAP { return 1; } # begining of a new map
3129: sub END_MAP { return 2; } # end of the map
3130: sub FORWARD { return 1; } # go forward
3131: sub BACKWARD { return 2; }
3132:
3133: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3134: # filter hash ref (or undef), already seen hash or undef, condition
3135: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3136: sub new {
3137: # magic invocation to create a class instance
3138: my $proto = shift;
3139: my $class = ref($proto) || $proto;
3140: my $self = {};
3141:
3142: weaken($self->{NAV_MAP} = shift);
3143: return undef unless ($self->{NAV_MAP});
3144:
3145: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3146: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3147:
3148: # If the given resources are just the ID of the resource, get the
3149: # objects
3150: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3151: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3152: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3153: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3154:
3155: $self->{FILTER} = shift;
3156:
3157: # A hash, used as a set, of resource already seen
3158: $self->{ALREADY_SEEN} = shift;
3159: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3160: $self->{CONDITION} = shift;
3161: $self->{DIRECTION} = shift || FORWARD();
3162:
3163: # Flag: Have we started yet?
3164: $self->{STARTED} = 0;
3165:
3166: # Should we continue calling the recursive iterator, if any?
3167: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3168: # The recursive iterator, if any
3169: $self->{RECURSIVE_ITERATOR} = undef;
3170: # Are we recursing on a map, or a branch?
3171: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3172: # And the count of how deep it is, so that this iterator can keep track of
3173: # when to pick back up again.
3174: $self->{RECURSIVE_DEPTH} = 0;
3175:
3176: # For keeping track of our branches, we maintain our own stack
3177: $self->{STACK} = [];
3178:
3179: # Start with the first resource
3180: if ($self->{DIRECTION} == FORWARD) {
3181: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3182: } else {
3183: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3184: }
3185:
3186: bless($self);
3187: return $self;
3188: }
3189:
3190: sub next {
3191: my $self = shift;
3192:
3193: # Are we using a recursive iterator? If so, pull from that and
3194: # watch the depth; we want to resume our level at the correct time.
3195: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3196: # grab the next from the recursive iterator
3197: my $next = $self->{RECURSIVE_ITERATOR}->next();
3198:
3199: # is it a begin or end map? Update depth if so
3200: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3201: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3202:
3203: # Are we back at depth 0? If so, stop recursing.
3204: if ($self->{RECURSIVE_DEPTH} == 0) {
3205: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3206: }
3207:
3208: return $next;
3209: }
3210:
3211: # Is there a current resource to grab? If not, then return
3212: # END_MAP, which will end the iterator.
3213: if (scalar(@{$self->{STACK}}) == 0) {
3214: return $self->END_MAP();
3215: }
3216:
3217: # Have we not yet begun? If not, return BEGIN_MAP and
3218: # remember that we've started.
3219: if ( !$self->{STARTED} ) {
3220: $self->{STARTED} = 1;
3221: return $self->BEGIN_MAP;
3222: }
3223:
3224: # Get the next resource in the branch
3225: $self->{HERE} = pop @{$self->{STACK}};
3226:
3227: # remember that we've seen this, so we don't return it again later
3228: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3229:
3230: # Get the next possible resources
3231: my $nextUnfiltered;
3232: if ($self->{DIRECTION} == FORWARD()) {
3233: $nextUnfiltered = $self->{HERE}->getNext();
3234: } else {
3235: $nextUnfiltered = $self->{HERE}->getPrevious();
3236: }
3237: my $next = [];
3238:
3239: # filter the next possibilities to remove things we've
3240: # already seen.
3241: foreach (@$nextUnfiltered) {
3242: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3243: push @$next, $_;
3244: }
3245: }
3246:
3247: while (@$next) {
3248: # copy the next possibilities over to the stack
3249: push @{$self->{STACK}}, shift @$next;
3250: }
3251:
3252: # If this is a map and we want to recurse down it... (not filtered out)
3253: if ($self->{HERE}->is_map() &&
3254: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3255: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3256: my $firstResource = $self->{HERE}->map_start();
3257: my $finishResource = $self->{HERE}->map_finish();
3258:
3259: $self->{RECURSIVE_ITERATOR} =
3260: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3261: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3262: $self->{CONDITION}, $self->{DIRECTION});
3263: }
3264:
3265: return $self->{HERE};
3266: }
3267:
3268: # Identical to the full iterator methods of the same name. Hate to copy/paste
3269: # but I also hate to "inherit" either iterator from the other.
3270:
3271: sub getStack {
3272: my $self=shift;
3273:
3274: my @stack;
3275:
3276: $self->populateStack(\@stack);
3277:
3278: return \@stack;
3279: }
3280:
3281: # Private method: Calls the iterators recursively to populate the stack.
3282: sub populateStack {
3283: my $self=shift;
3284: my $stack = shift;
3285:
3286: push @$stack, $self->{HERE} if ($self->{HERE});
3287:
3288: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3289: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3290: }
3291: }
3292:
3293: 1;
3294:
3295: package Apache::lonnavmaps::resource;
3296: use WeakRef;
3297: use Apache::lonnet;
3298:
3299: =pod
3300:
3301: =head1 Object: resource
3302:
3303: X<resource, navmap object>
3304: A resource object encapsulates a resource in a resource map, allowing
3305: easy manipulation of the resource, querying the properties of the
3306: resource (including user properties), and represents a reference that
3307: can be used as the canonical representation of the resource by
3308: lonnavmap clients like renderers.
3309:
3310: A resource only makes sense in the context of a navmap, as some of the
3311: data is stored in the navmap object.
3312:
3313: You will probably never need to instantiate this object directly. Use
3314: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3315: starting resource.
3316:
3317: Resource objects respect the parameter_hiddenparts, which suppresses
3318: various parts according to the wishes of the map author. As of this
3319: writing, there is no way to override this parameter, and suppressed
3320: parts will never be returned, nor will their response types or ids be
3321: stored.
3322:
3323: =head2 Overview
3324:
3325: A B<Resource> is the most granular type of object in LON-CAPA that can
3326: be included in a course. It can either be a particular resource, like
3327: an HTML page, external resource, problem, etc., or it can be a
3328: container sequence, such as a "page" or a "map".
3329:
3330: To see a sequence from the user's point of view, please see the
3331: B<Creating a Course: Maps and Sequences> chapter of the Author's
3332: Manual.
3333:
3334: A Resource Object, once obtained from a navmap object via a B<getBy*>
3335: method of the navmap, or from an iterator, allows you to query
3336: information about that resource.
3337:
3338: Generally, you do not ever want to create a resource object yourself,
3339: so creation has been left undocumented. Always retrieve resources
3340: from navmap objects.
3341:
3342: =head3 Identifying Resources
3343:
3344: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3345: unique to that resource for a given course. X<resource ID, in big hash>
3346: The Resource ID has the form #.#, where the first number is the same
3347: for every resource in a map, and the second is unique. For instance,
3348: for a course laid out like this:
3349:
3350: * Problem 1
3351: * Map
3352: * Resource 2
3353: * Resource 3
3354:
3355: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3356: C<Resource 3> will share a first number. The second number may end up
3357: re-used between the two groups.
3358:
3359: The resource ID is only used in the big hash, but can be used in the
3360: context of a course to identify a resource easily. (For instance, the
3361: printing system uses it to record which resources from a sequence you
3362: wish to print.)
3363:
3364: X<symb> X<resource, symb>
3365: All resources also have B<symb>s, which uniquely identify a resource
3366: in a course. Many internal LON-CAPA functions expect a symb. A symb
3367: carries along with it the URL of the resource, and the map it appears
3368: in. Symbs are much larger then resource IDs.
3369:
3370: =cut
3371:
3372: sub new {
3373: # magic invocation to create a class instance
3374: my $proto = shift;
3375: my $class = ref($proto) || $proto;
3376: my $self = {};
3377:
3378: weaken($self->{NAV_MAP} = shift);
3379: $self->{ID} = shift;
3380:
3381: # Store this new resource in the parent nav map's cache.
3382: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3383: $self->{RESOURCE_ERROR} = 0;
3384:
3385: # A hash that can be used by two-pass algorithms to store data
3386: # about this resource in. Not used by the resource object
3387: # directly.
3388: $self->{DATA} = {};
3389:
3390: bless($self);
3391:
3392: return $self;
3393: }
3394:
3395: # private function: simplify the NAV_HASH lookups we keep doing
3396: # pass the name, and to automatically append my ID, pass a true val on the
3397: # second param
3398: sub navHash {
3399: my $self = shift;
3400: my $param = shift;
3401: my $id = shift;
3402: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3403: }
3404:
3405: =pod
3406:
3407: =head2 Methods
3408:
3409: Once you have a resource object, here's what you can do with it:
3410:
3411: =head3 Attribute Retrieval
3412:
3413: Every resource has certain attributes that can be retrieved and used:
3414:
3415: =over 4
3416:
3417: =item * B<ID>: Every resource has an ID that is unique for that
3418: resource in the course it is in. The ID is actually in the hash
3419: representing the resource, so for a resource object $res, obtain
3420: it via C<$res->{ID}).
3421:
3422: =item * B<compTitle>:
3423:
3424: Returns a "composite title", that is equal to $res->title() if the
3425: resource has a title, and is otherwise the last part of the URL (e.g.,
3426: "problem.problem").
3427:
3428: =item * B<ext>:
3429:
3430: Returns true if the resource is external.
3431:
3432: =item * B<kind>:
3433:
3434: Returns the kind of the resource from the compiled nav map.
3435:
3436: =item * B<randomout>:
3437:
3438: Returns true if this resource was chosen to NOT be shown to the user
3439: by the random map selection feature. In other words, this is usually
3440: false.
3441:
3442: =item * B<randompick>:
3443:
3444: Returns true for a map if the randompick feature is being used on the
3445: map. (?)
3446:
3447: =item * B<src>:
3448:
3449: Returns the source for the resource.
3450:
3451: =item * B<symb>:
3452:
3453: Returns the symb for the resource.
3454:
3455: =item * B<title>:
3456:
3457: Returns the title of the resource.
3458:
3459: =back
3460:
3461: =cut
3462:
3463: # These info functions can be used directly, as they don't return
3464: # resource information.
3465: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3466: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3467: sub from { my $self=shift; return $self->navHash("from_", 1); }
3468: # considered private and undocumented
3469: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3470: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3471: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3472: sub randompick {
3473: my $self = shift;
3474: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3475: '.0.parameter_randompick'};
3476: }
3477: sub src {
3478: my $self=shift;
3479: return $self->navHash("src_", 1);
3480: }
3481: sub symb {
3482: my $self=shift;
3483: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3484: my $symbSrc = &Apache::lonnet::declutter($self->src());
3485: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3486: . '___' . $second . '___' . $symbSrc;
3487: return &Apache::lonnet::symbclean($symb);
3488: }
3489: sub title {
3490: my $self=shift;
3491: if ($self->{ID} eq '0.0') {
3492: # If this is the top-level map, return the title of the course
3493: # since this map can not be titled otherwise.
3494: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3495: }
3496: return $self->navHash("title_", 1); }
3497: # considered private and undocumented
3498: sub to { my $self=shift; return $self->navHash("to_", 1); }
3499: sub compTitle {
3500: my $self = shift;
3501: my $title = $self->title();
3502: $title=~s/\&colon\;/\:/gs;
3503: if (!$title) {
3504: $title = $self->src();
3505: $title = substr($title, rindex($title, '/') + 1);
3506: }
3507: return $title;
3508: }
3509: =pod
3510:
3511: B<Predicate Testing the Resource>
3512:
3513: These methods are shortcuts to deciding if a given resource has a given property.
3514:
3515: =over 4
3516:
3517: =item * B<is_map>:
3518:
3519: Returns true if the resource is a map type.
3520:
3521: =item * B<is_problem>:
3522:
3523: Returns true if the resource is a problem type, false
3524: otherwise. (Looks at the extension on the src field; might need more
3525: to work correctly.)
3526:
3527: =item * B<is_page>:
3528:
3529: Returns true if the resource is a page.
3530:
3531: =item * B<is_sequence>:
3532:
3533: Returns true if the resource is a sequence.
3534:
3535: =back
3536:
3537: =cut
3538:
3539: sub hasResource {
3540: my $self = shift;
3541: return $self->{NAV_MAP}->hasResource(@_);
3542: }
3543:
3544: sub retrieveResources {
3545: my $self = shift;
3546: return $self->{NAV_MAP}->retrieveResources(@_);
3547: }
3548:
3549: sub is_html {
3550: my $self=shift;
3551: my $src = $self->src();
3552: return ($src =~ /html$/);
3553: }
3554: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3555: sub is_page {
3556: my $self=shift;
3557: my $src = $self->src();
3558: return $self->navHash("is_map_", 1) &&
3559: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3560: }
3561: sub is_problem {
3562: my $self=shift;
3563: my $src = $self->src();
3564: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3565: }
3566: sub contains_problem {
3567: my $self=shift;
3568: if ($self->is_page()) {
3569: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3570: return $hasProblem;
3571: }
3572: return 0;
3573: }
3574: sub is_sequence {
3575: my $self=shift;
3576: my $src = $self->src();
3577: return $self->navHash("is_map_", 1) &&
3578: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3579: }
3580: sub is_survey {
3581: my $self = shift();
3582: my $part = shift();
3583: if ($self->parmval('type',$part) eq 'survey') {
3584: return 1;
3585: }
3586: if ($self->src() =~ /\.(survey)$/) {
3587: return 1;
3588: }
3589: return 0;
3590: }
3591:
3592: sub is_empty_sequence {
3593: my $self=shift;
3594: my $src = $self->src();
3595: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3596: }
3597:
3598: # Private method: Shells out to the parmval in the nav map, handler parts.
3599: sub parmval {
3600: my $self = shift;
3601: my $what = shift;
3602: my $part = shift;
3603: if (!defined($part)) {
3604: $part = '0';
3605: }
3606: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3607: }
3608:
3609: =pod
3610:
3611: B<Map Methods>
3612:
3613: These methods are useful for getting information about the map
3614: properties of the resource, if the resource is a map (B<is_map>).
3615:
3616: =over 4
3617:
3618: =item * B<map_finish>:
3619:
3620: Returns a reference to a resource object corresponding to the finish
3621: resource of the map.
3622:
3623: =item * B<map_pc>:
3624:
3625: Returns the pc value of the map, which is the first number that
3626: appears in the resource ID of the resources in the map, and is the
3627: number that appears around the middle of the symbs of the resources in
3628: that map.
3629:
3630: =item * B<map_start>:
3631:
3632: Returns a reference to a resource object corresponding to the start
3633: resource of the map.
3634:
3635: =item * B<map_type>:
3636:
3637: Returns a string with the type of the map in it.
3638:
3639: =back
3640:
3641: =cut
3642:
3643: sub map_finish {
3644: my $self = shift;
3645: my $src = $self->src();
3646: $src = Apache::lonnet::clutter($src);
3647: my $res = $self->navHash("map_finish_$src", 0);
3648: $res = $self->{NAV_MAP}->getById($res);
3649: return $res;
3650: }
3651: sub map_pc {
3652: my $self = shift;
3653: my $src = $self->src();
3654: return $self->navHash("map_pc_$src", 0);
3655: }
3656: sub map_start {
3657: my $self = shift;
3658: my $src = $self->src();
3659: $src = Apache::lonnet::clutter($src);
3660: my $res = $self->navHash("map_start_$src", 0);
3661: $res = $self->{NAV_MAP}->getById($res);
3662: return $res;
3663: }
3664: sub map_type {
3665: my $self = shift;
3666: my $pc = $self->map_pc();
3667: return $self->navHash("map_type_$pc", 0);
3668: }
3669:
3670: #####
3671: # Property queries
3672: #####
3673:
3674: # These functions will be responsible for returning the CORRECT
3675: # VALUE for the parameter, no matter what. So while they may look
3676: # like direct calls to parmval, they can be more then that.
3677: # So, for instance, the duedate function should use the "duedatetype"
3678: # information, rather then the resource object user.
3679:
3680: =pod
3681:
3682: =head2 Resource Parameters
3683:
3684: In order to use the resource parameters correctly, the nav map must
3685: have been instantiated with genCourseAndUserOptions set to true, so
3686: the courseopt and useropt is read correctly. Then, you can call these
3687: functions to get the relevant parameters for the resource. Each
3688: function defaults to part "0", but can be directed to another part by
3689: passing the part as the parameter.
3690:
3691: These methods are responsible for getting the parameter correct, not
3692: merely reflecting the contents of the GDBM hashes. As we move towards
3693: dates relative to other dates, these methods should be updated to
3694: reflect that. (Then, anybody using these methods will not have to update
3695: their code.)
3696:
3697: =over 4
3698:
3699: =item * B<acc>:
3700:
3701: Get the Client IP/Name Access Control information.
3702:
3703: =item * B<answerdate>:
3704:
3705: Get the answer-reveal date for the problem.
3706:
3707: =item * B<awarded>:
3708:
3709: Gets the awarded value for the problem part. Requires genUserData set to
3710: true when the navmap object was created.
3711:
3712: =item * B<duedate>:
3713:
3714: Get the due date for the problem.
3715:
3716: =item * B<tries>:
3717:
3718: Get the number of tries the student has used on the problem.
3719:
3720: =item * B<maxtries>:
3721:
3722: Get the number of max tries allowed.
3723:
3724: =item * B<opendate>:
3725:
3726: Get the open date for the problem.
3727:
3728: =item * B<sig>:
3729:
3730: Get the significant figures setting.
3731:
3732: =item * B<tol>:
3733:
3734: Get the tolerance for the problem.
3735:
3736: =item * B<tries>:
3737:
3738: Get the number of tries the user has already used on the problem.
3739:
3740: =item * B<type>:
3741:
3742: Get the question type for the problem.
3743:
3744: =item * B<weight>:
3745:
3746: Get the weight for the problem.
3747:
3748: =back
3749:
3750: =cut
3751:
3752: sub acc {
3753: (my $self, my $part) = @_;
3754: return $self->parmval("acc", $part);
3755: }
3756: sub answerdate {
3757: (my $self, my $part) = @_;
3758: # Handle intervals
3759: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3760: return $self->duedate($part) +
3761: $self->parmval("answerdate", $part);
3762: }
3763: return $self->parmval("answerdate", $part);
3764: }
3765: sub awarded {
3766: my $self = shift; my $part = shift;
3767: $self->{NAV_MAP}->get_user_data();
3768: if (!defined($part)) { $part = '0'; }
3769: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3770: }
3771: sub duedate {
3772: (my $self, my $part) = @_;
3773: my $interval=$self->parmval("interval", $part);
3774: if ($interval) {
3775: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3776: if ($first_access) { return ($first_access+$interval); }
3777: }
3778: return $self->parmval("duedate", $part);
3779: }
3780: sub maxtries {
3781: (my $self, my $part) = @_;
3782: return $self->parmval("maxtries", $part);
3783: }
3784: sub opendate {
3785: (my $self, my $part) = @_;
3786: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3787: return $self->duedate($part) -
3788: $self->parmval("opendate", $part);
3789: }
3790: return $self->parmval("opendate");
3791: }
3792: sub problemstatus {
3793: (my $self, my $part) = @_;
3794: return lc $self->parmval("problemstatus", $part);
3795: }
3796: sub sig {
3797: (my $self, my $part) = @_;
3798: return $self->parmval("sig", $part);
3799: }
3800: sub tol {
3801: (my $self, my $part) = @_;
3802: return $self->parmval("tol", $part);
3803: }
3804: sub tries {
3805: my $self = shift;
3806: my $tries = $self->queryRestoreHash('tries', shift);
3807: if (!defined($tries)) { return '0';}
3808: return $tries;
3809: }
3810: sub type {
3811: (my $self, my $part) = @_;
3812: return $self->parmval("type", $part);
3813: }
3814: sub weight {
3815: my $self = shift; my $part = shift;
3816: if (!defined($part)) { $part = '0'; }
3817: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3818: $self->symb(), $ENV{'user.domain'},
3819: $ENV{'user.name'},
3820: $ENV{'request.course.sec'});
3821: }
3822: sub part_display {
3823: my $self= shift(); my $partID = shift();
3824: if (! defined($partID)) { $partID = '0'; }
3825: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3826: $self->symb);
3827: if (! defined($display) || $display eq '') {
3828: $display = $partID;
3829: }
3830: return $display;
3831: }
3832:
3833: # Multiple things need this
3834: sub getReturnHash {
3835: my $self = shift;
3836:
3837: if (!defined($self->{RETURN_HASH})) {
3838: my %tmpHash = &Apache::lonnet::restore($self->symb());
3839: $self->{RETURN_HASH} = \%tmpHash;
3840: }
3841: }
3842:
3843: ######
3844: # Status queries
3845: ######
3846:
3847: # These methods query the status of problems.
3848:
3849: # If we need to count parts, this function determines the number of
3850: # parts from the metadata. When called, it returns a reference to a list
3851: # of strings corresponding to the parts. (Thus, using it in a scalar context
3852: # tells you how many parts you have in the problem:
3853: # $partcount = scalar($resource->countParts());
3854: # Don't use $self->{PARTS} directly because you don't know if it's been
3855: # computed yet.
3856:
3857: =pod
3858:
3859: =head2 Resource misc
3860:
3861: Misc. functions for the resource.
3862:
3863: =over 4
3864:
3865: =item * B<hasDiscussion>:
3866:
3867: Returns a false value if there has been discussion since the user last
3868: logged in, true if there has. Always returns false if the discussion
3869: data was not extracted when the nav map was constructed.
3870:
3871: =item * B<getFeedback>:
3872:
3873: Gets the feedback for the resource and returns the raw feedback string
3874: for the resource, or the null string if there is no feedback or the
3875: email data was not extracted when the nav map was constructed. Usually
3876: used like this:
3877:
3878: for (split(/\,/, $res->getFeedback())) {
3879: my $link = &Apache::lonnet::escape($_);
3880: ...
3881:
3882: and use the link as appropriate.
3883:
3884: =cut
3885:
3886: sub hasDiscussion {
3887: my $self = shift;
3888: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3889: }
3890:
3891: sub getFeedback {
3892: my $self = shift;
3893: my $source = $self->src();
3894: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3895: return $self->{NAV_MAP}->getFeedback($source);
3896: }
3897:
3898: sub getErrors {
3899: my $self = shift;
3900: my $source = $self->src();
3901: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3902: return $self->{NAV_MAP}->getErrors($source);
3903: }
3904:
3905: =pod
3906:
3907: =item * B<parts>():
3908:
3909: Returns a list reference containing sorted strings corresponding to
3910: each part of the problem. Single part problems have only a part '0'.
3911: Multipart problems do not return their part '0', since they typically
3912: do not really matter.
3913:
3914: =item * B<countParts>():
3915:
3916: Returns the number of parts of the problem a student can answer. Thus,
3917: for single part problems, returns 1. For multipart, it returns the
3918: number of parts in the problem, not including psuedo-part 0.
3919:
3920: =item * B<countResponses>():
3921:
3922: Returns the total number of responses in the problem a student can answer.
3923:
3924: =item * B<responseTypes>():
3925:
3926: Returns a hash whose keys are the response types. The values are the number
3927: of times each response type is used. This is for the I<entire> problem, not
3928: just a single part.
3929:
3930: =item * B<multipart>():
3931:
3932: Returns true if the problem is multipart, false otherwise. Use this instead
3933: of countParts if all you want is multipart/not multipart.
3934:
3935: =item * B<responseType>($part):
3936:
3937: Returns the response type of the part, without the word "response" on the
3938: end. Example return values: 'string', 'essay', 'numeric', etc.
3939:
3940: =item * B<responseIds>($part):
3941:
3942: Retreives the response IDs for the given part as an array reference containing
3943: strings naming the response IDs. This may be empty.
3944:
3945: =back
3946:
3947: =cut
3948:
3949: sub parts {
3950: my $self = shift;
3951:
3952: if ($self->ext) { return []; }
3953:
3954: $self->extractParts();
3955: return $self->{PARTS};
3956: }
3957:
3958: sub countParts {
3959: my $self = shift;
3960:
3961: my $parts = $self->parts();
3962:
3963: # If I left this here, then it's not necessary.
3964: #my $delta = 0;
3965: #for my $part (@$parts) {
3966: # if ($part eq '0') { $delta--; }
3967: #}
3968:
3969: if ($self->{RESOURCE_ERROR}) {
3970: return 0;
3971: }
3972:
3973: return scalar(@{$parts}); # + $delta;
3974: }
3975:
3976: sub countResponses {
3977: my $self = shift;
3978: my $count;
3979: foreach my $part (@{$self->parts()}) {
3980: $count+= scalar($self->responseIds($part));
3981: }
3982: return $count;
3983: }
3984:
3985: sub responseTypes {
3986: my $self = shift;
3987: my %responses;
3988: foreach my $part ($self->parts()) {
3989: foreach my $responsetype ($self->responseType($part)) {
3990: $responses{$responsetype}++ if (defined($responsetype));
3991: }
3992: }
3993: return %responses;
3994: }
3995:
3996: sub multipart {
3997: my $self = shift;
3998: return $self->countParts() > 1;
3999: }
4000:
4001: sub singlepart {
4002: my $self = shift;
4003: return $self->countParts() == 1;
4004: }
4005:
4006: sub responseType {
4007: my $self = shift;
4008: my $part = shift;
4009:
4010: $self->extractParts();
4011: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4012: return @{$self->{RESPONSE_TYPES}->{$part}};
4013: } else {
4014: return undef;
4015: }
4016: }
4017:
4018: sub responseIds {
4019: my $self = shift;
4020: my $part = shift;
4021:
4022: $self->extractParts();
4023: if (defined($self->{RESPONSE_IDS}->{$part})) {
4024: return @{$self->{RESPONSE_IDS}->{$part}};
4025: } else {
4026: return undef;
4027: }
4028: }
4029:
4030: # Private function: Extracts the parts information, both part names and
4031: # part types, and saves it.
4032: sub extractParts {
4033: my $self = shift;
4034:
4035: return if (defined($self->{PARTS}));
4036: return if ($self->ext);
4037:
4038: $self->{PARTS} = [];
4039:
4040: my %parts;
4041:
4042: # Retrieve part count, if this is a problem
4043: if ($self->is_problem()) {
4044: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4045: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4046:
4047: if ($partorder) {
4048: my @parts;
4049: for my $part (split (/,/,$partorder)) {
4050: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4051: push @parts, $part;
4052: $parts{$part} = 1;
4053: }
4054: }
4055: $self->{PARTS} = \@parts;
4056: } else {
4057: if (!$metadata) {
4058: $self->{RESOURCE_ERROR} = 1;
4059: $self->{PARTS} = [];
4060: $self->{PART_TYPE} = {};
4061: return;
4062: }
4063: foreach (split(/\,/,$metadata)) {
4064: if ($_ =~ /^part_(.*)$/) {
4065: my $part = $1;
4066: # This floods the logs if it blows up
4067: if (defined($parts{$part})) {
4068: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4069: }
4070:
4071: # check to see if part is turned off.
4072:
4073: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4074: $parts{$part} = 1;
4075: }
4076: }
4077: }
4078: my @sortedParts = sort keys %parts;
4079: $self->{PARTS} = \@sortedParts;
4080: }
4081:
4082:
4083: # These hashes probably do not need names that end with "Hash"....
4084: my %responseIdHash;
4085: my %responseTypeHash;
4086:
4087:
4088: # Init the responseIdHash
4089: foreach (@{$self->{PARTS}}) {
4090: $responseIdHash{$_} = [];
4091: }
4092:
4093: # Now, the unfortunate thing about this is that parts, part name, and
4094: # response id are delimited by underscores, but both the part
4095: # name and response id can themselves have underscores in them.
4096: # So we have to use our knowlege of part names to figure out
4097: # where the part names begin and end, and even then, it is possible
4098: # to construct ambiguous situations.
4099: foreach (split /,/, $metadata) {
4100: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4101: my $responseType = $1;
4102: my $partStuff = $2;
4103: my $partIdSoFar = '';
4104: my @partChunks = split /_/, $partStuff;
4105: my $i = 0;
4106: for ($i = 0; $i < scalar(@partChunks); $i++) {
4107: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4108: $partIdSoFar .= $partChunks[$i];
4109: if ($parts{$partIdSoFar}) {
4110: my @otherChunks = @partChunks[$i+1..$#partChunks];
4111: my $responseId = join('_', @otherChunks);
4112: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4113: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4114: }
4115: }
4116: }
4117: }
4118: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4119: #
4120: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4121: if ($resorder) {
4122: my @resorder=split(/,/,$resorder);
4123: foreach my $part (keys(%responseIdHash)) {
4124: my $i=0;
4125: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4126: my @neworder;
4127: foreach my $possibleid (@resorder) {
4128: if (exists($resids{$possibleid})) {
4129: push(@neworder,$resids{$possibleid});
4130: }
4131: }
4132: my @ids;
4133: my @type;
4134: foreach my $element (@neworder) {
4135: push (@ids,$responseIdHash{$part}->[$element]);
4136: push (@type,$responseTypeHash{$part}->[$element]);
4137: }
4138: $responseIdHash{$part}=\@ids;
4139: $responseTypeHash{$part}=\@type;
4140: }
4141: }
4142: $self->{RESPONSE_IDS} = \%responseIdHash;
4143: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4144: }
4145:
4146: return;
4147: }
4148:
4149: =pod
4150:
4151: =head2 Resource Status
4152:
4153: Problem resources have status information, reflecting their various
4154: dates and completion statuses.
4155:
4156: There are two aspects to the status: the date-related information and
4157: the completion information.
4158:
4159: Idiomatic usage of these two methods would probably look something
4160: like
4161:
4162: foreach ($resource->parts()) {
4163: my $dateStatus = $resource->getDateStatus($_);
4164: my $completionStatus = $resource->getCompletionStatus($_);
4165:
4166: or
4167:
4168: my $status = $resource->status($_);
4169:
4170: ... use it here ...
4171: }
4172:
4173: Which you use depends on exactly what you are looking for. The
4174: status() function has been optimized for the nav maps display and may
4175: not precisely match what you need elsewhere.
4176:
4177: The symbolic constants shown below can be accessed through the
4178: resource object: C<$res->OPEN>.
4179:
4180: =over 4
4181:
4182: =item * B<getDateStatus>($part):
4183:
4184: ($part defaults to 0). A convenience function that returns a symbolic
4185: constant telling you about the date status of the part. The possible
4186: return values are:
4187:
4188: =back
4189:
4190: B<Date Codes>
4191:
4192: =over 4
4193:
4194: =item * B<OPEN_LATER>:
4195:
4196: The problem will be opened later.
4197:
4198: =item * B<OPEN>:
4199:
4200: Open and not yet due.
4201:
4202:
4203: =item * B<PAST_DUE_ANSWER_LATER>:
4204:
4205: The due date has passed, but the answer date has not yet arrived.
4206:
4207: =item * B<PAST_DUE_NO_ANSWER>:
4208:
4209: The due date has passed and there is no answer opening date set.
4210:
4211: =item * B<ANSWER_OPEN>:
4212:
4213: The answer date is here.
4214:
4215: =item * B<NETWORK_FAILURE>:
4216:
4217: The information is unknown due to network failure.
4218:
4219: =back
4220:
4221: =cut
4222:
4223: # Apparently the compiler optimizes these into constants automatically
4224: sub OPEN_LATER { return 0; }
4225: sub OPEN { return 1; }
4226: sub PAST_DUE_NO_ANSWER { return 2; }
4227: sub PAST_DUE_ANSWER_LATER { return 3; }
4228: sub ANSWER_OPEN { return 4; }
4229: sub NOTHING_SET { return 5; }
4230: sub NETWORK_FAILURE { return 100; }
4231:
4232: # getDateStatus gets the date status for a given problem part.
4233: # Because answer date, due date, and open date are fully independent
4234: # (i.e., it is perfectly possible to *only* have an answer date),
4235: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4236: # (past, future, none given). This function handles this with a decision
4237: # tree. Read the comments to follow the decision tree.
4238:
4239: sub getDateStatus {
4240: my $self = shift;
4241: my $part = shift;
4242: $part = "0" if (!defined($part));
4243:
4244: # Always return network failure if there was one.
4245: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4246:
4247: my $now = time();
4248:
4249: my $open = $self->opendate($part);
4250: my $due = $self->duedate($part);
4251: my $answer = $self->answerdate($part);
4252:
4253: if (!$open && !$due && !$answer) {
4254: # no data on the problem at all
4255: # should this be the same as "open later"? think multipart.
4256: return $self->NOTHING_SET;
4257: }
4258: if (!$open || $now < $open) {return $self->OPEN_LATER}
4259: if (!$due || $now < $due) {return $self->OPEN}
4260: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4261: if ($answer) { return $self->ANSWER_OPEN; }
4262: return PAST_DUE_NO_ANSWER;
4263: }
4264:
4265: =pod
4266:
4267: B<>
4268:
4269: =over 4
4270:
4271: =item * B<getCompletionStatus>($part):
4272:
4273: ($part defaults to 0.) A convenience function that returns a symbolic
4274: constant telling you about the completion status of the part, with the
4275: following possible results:
4276:
4277: =back
4278:
4279: B<Completion Codes>
4280:
4281: =over 4
4282:
4283: =item * B<NOT_ATTEMPTED>:
4284:
4285: Has not been attempted at all.
4286:
4287: =item * B<INCORRECT>:
4288:
4289: Attempted, but wrong by student.
4290:
4291: =item * B<INCORRECT_BY_OVERRIDE>:
4292:
4293: Attempted, but wrong by instructor override.
4294:
4295: =item * B<CORRECT>:
4296:
4297: Correct or correct by instructor.
4298:
4299: =item * B<CORRECT_BY_OVERRIDE>:
4300:
4301: Correct by instructor override.
4302:
4303: =item * B<EXCUSED>:
4304:
4305: Excused. Not yet implemented.
4306:
4307: =item * B<NETWORK_FAILURE>:
4308:
4309: Information not available due to network failure.
4310:
4311: =item * B<ATTEMPTED>:
4312:
4313: Attempted, and not yet graded.
4314:
4315: =back
4316:
4317: =cut
4318:
4319: sub NOT_ATTEMPTED { return 10; }
4320: sub INCORRECT { return 11; }
4321: sub INCORRECT_BY_OVERRIDE { return 12; }
4322: sub CORRECT { return 13; }
4323: sub CORRECT_BY_OVERRIDE { return 14; }
4324: sub EXCUSED { return 15; }
4325: sub ATTEMPTED { return 16; }
4326:
4327: sub getCompletionStatus {
4328: my $self = shift;
4329: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4330:
4331: my $status = $self->queryRestoreHash('solved', shift);
4332:
4333: # Left as separate if statements in case we ever do more with this
4334: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4335: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4336: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
4337: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4338: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4339: if ($status eq 'excused') {return $self->EXCUSED; }
4340: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4341: return $self->NOT_ATTEMPTED;
4342: }
4343:
4344: sub queryRestoreHash {
4345: my $self = shift;
4346: my $hashentry = shift;
4347: my $part = shift;
4348: $part = "0" if (!defined($part) || $part eq '');
4349: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4350:
4351: $self->getReturnHash();
4352:
4353: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4354: }
4355:
4356: =pod
4357:
4358: B<Composite Status>
4359:
4360: Along with directly returning the date or completion status, the
4361: resource object includes a convenience function B<status>() that will
4362: combine the two status tidbits into one composite status that can
4363: represent the status of the resource as a whole. This method represents
4364: the concept of the thing we want to display to the user on the nav maps
4365: screen, which is a combination of completion and open status. The precise logic is
4366: documented in the comments of the status method. The following results
4367: may be returned, all available as methods on the resource object
4368: ($res->NETWORK_FAILURE): In addition to the return values that match
4369: the date or completion status, this function can return "ANSWER_SUBMITTED"
4370: if that problemstatus parameter value is set to No, suppressing the
4371: incorrect/correct feedback.
4372:
4373: =over 4
4374:
4375: =item * B<NETWORK_FAILURE>:
4376:
4377: The network has failed and the information is not available.
4378:
4379: =item * B<NOTHING_SET>:
4380:
4381: No dates have been set for this problem (part) at all. (Because only
4382: certain parts of a multi-part problem may be assigned, this can not be
4383: collapsed into "open later", as we do not know a given part will EVER
4384: be opened. For single part, this is the same as "OPEN_LATER".)
4385:
4386: =item * B<CORRECT>:
4387:
4388: For any reason at all, the part is considered correct.
4389:
4390: =item * B<EXCUSED>:
4391:
4392: For any reason at all, the problem is excused.
4393:
4394: =item * B<PAST_DUE_NO_ANSWER>:
4395:
4396: The problem is past due, not considered correct, and no answer date is
4397: set.
4398:
4399: =item * B<PAST_DUE_ANSWER_LATER>:
4400:
4401: The problem is past due, not considered correct, and an answer date in
4402: the future is set.
4403:
4404: =item * B<ANSWER_OPEN>:
4405:
4406: The problem is past due, not correct, and the answer is now available.
4407:
4408: =item * B<OPEN_LATER>:
4409:
4410: The problem is not yet open.
4411:
4412: =item * B<TRIES_LEFT>:
4413:
4414: The problem is open, has been tried, is not correct, but there are
4415: tries left.
4416:
4417: =item * B<INCORRECT>:
4418:
4419: The problem is open, and all tries have been used without getting the
4420: correct answer.
4421:
4422: =item * B<OPEN>:
4423:
4424: The item is open and not yet tried.
4425:
4426: =item * B<ATTEMPTED>:
4427:
4428: The problem has been attempted.
4429:
4430: =item * B<ANSWER_SUBMITTED>:
4431:
4432: An answer has been submitted, but the student should not see it.
4433:
4434: =back
4435:
4436: =cut
4437:
4438: sub TRIES_LEFT { return 20; }
4439: sub ANSWER_SUBMITTED { return 21; }
4440:
4441: sub status {
4442: my $self = shift;
4443: my $part = shift;
4444: if (!defined($part)) { $part = "0"; }
4445: my $completionStatus = $self->getCompletionStatus($part);
4446: my $dateStatus = $self->getDateStatus($part);
4447:
4448: # What we have is a two-dimensional matrix with 4 entries on one
4449: # dimension and 5 entries on the other, which we want to colorize,
4450: # plus network failure and "no date data at all".
4451:
4452: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4453: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4454:
4455: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4456: # If there's an answer date and we're past it, don't
4457: # suppress the feedback; student should know
4458: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4459: $suppressFeedback = 0;
4460: }
4461:
4462: # There are a few whole rows we can dispose of:
4463: if ($completionStatus == CORRECT ||
4464: $completionStatus == CORRECT_BY_OVERRIDE ) {
4465: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4466: }
4467:
4468: if ($completionStatus == ATTEMPTED) {
4469: return ATTEMPTED;
4470: }
4471:
4472: # If it's EXCUSED, then return that no matter what
4473: if ($completionStatus == EXCUSED) {
4474: return EXCUSED;
4475: }
4476:
4477: if ($dateStatus == NOTHING_SET) {
4478: return NOTHING_SET;
4479: }
4480:
4481: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4482: # by 4 matrix (date statuses).
4483:
4484: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4485: $dateStatus == PAST_DUE_NO_ANSWER ) {
4486: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4487: }
4488:
4489: if ($dateStatus == ANSWER_OPEN) {
4490: return ANSWER_OPEN;
4491: }
4492:
4493: # Now: (incorrect, incorrect_override, not_attempted) x
4494: # (open_later), (open)
4495:
4496: if ($dateStatus == OPEN_LATER) {
4497: return OPEN_LATER;
4498: }
4499:
4500: # If it's WRONG...
4501: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4502: # and there are TRIES LEFT:
4503: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4504: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4505: }
4506: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4507: }
4508:
4509: # Otherwise, it's untried and open
4510: return OPEN;
4511: }
4512:
4513: sub CLOSED { return 23; }
4514: sub ERROR { return 24; }
4515:
4516: =pod
4517:
4518: B<Simple Status>
4519:
4520: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4521: "Simple status" corresponds to "which icon is shown on the
4522: Navmaps". There are six "simple" statuses:
4523:
4524: =over 4
4525:
4526: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4527:
4528: =item * B<OPEN>: The problem is open and unattempted.
4529:
4530: =item * B<CORRECT>: The problem is correct for any reason.
4531:
4532: =item * B<INCORRECT>: The problem is incorrect and can still be
4533: completed successfully.
4534:
4535: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4536: does not know if they are correct. (The ellipsis icon.)
4537:
4538: =item * B<ERROR>: There is an error retrieving information about this
4539: problem.
4540:
4541: =back
4542:
4543: =cut
4544:
4545: # This hash maps the composite status to this simple status, and
4546: # can be used directly, if you like
4547: my %compositeToSimple =
4548: (
4549: NETWORK_FAILURE() => ERROR,
4550: NOTHING_SET() => CLOSED,
4551: CORRECT() => CORRECT,
4552: EXCUSED() => CORRECT,
4553: PAST_DUE_NO_ANSWER() => INCORRECT,
4554: PAST_DUE_ANSWER_LATER() => INCORRECT,
4555: ANSWER_OPEN() => INCORRECT,
4556: OPEN_LATER() => CLOSED,
4557: TRIES_LEFT() => OPEN,
4558: INCORRECT() => INCORRECT,
4559: OPEN() => OPEN,
4560: ATTEMPTED() => ATTEMPTED,
4561: ANSWER_SUBMITTED() => ATTEMPTED
4562: );
4563:
4564: sub simpleStatus {
4565: my $self = shift;
4566: my $part = shift;
4567: my $status = $self->status($part);
4568: return $compositeToSimple{$status};
4569: }
4570:
4571: =pod
4572:
4573: B<simpleStatusCount> will return an array reference containing, in
4574: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4575: and ERROR parts the given problem has.
4576:
4577: =cut
4578:
4579: # This maps the status to the slot we want to increment
4580: my %statusToSlotMap =
4581: (
4582: OPEN() => 0,
4583: CLOSED() => 1,
4584: CORRECT() => 2,
4585: INCORRECT() => 3,
4586: ATTEMPTED() => 4,
4587: ERROR() => 5
4588: );
4589:
4590: sub statusToSlot { return $statusToSlotMap{shift()}; }
4591:
4592: sub simpleStatusCount {
4593: my $self = shift;
4594:
4595: my @counts = (0, 0, 0, 0, 0, 0, 0);
4596: foreach my $part (@{$self->parts()}) {
4597: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4598: }
4599:
4600: return \@counts;
4601: }
4602:
4603: =pod
4604:
4605: B<Completable>
4606:
4607: The completable method represents the concept of I<whether the student can
4608: currently do the problem>. If the student can do the problem, which means
4609: that it is open, there are tries left, and if the problem is manually graded
4610: or the grade is suppressed via problemstatus, the student has not tried it
4611: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4612: either the student has tried it and there is no feedback, or that for
4613: some reason it is no longer completable (not open yet, successfully completed,
4614: out of tries, etc.). As an example, this is used as the filter for the
4615: "Uncompleted Homework" option for the nav maps.
4616:
4617: If this does not quite meet your needs, do not fiddle with it (unless you are
4618: fixing it to better match the student's conception of "completable" because
4619: it's broken somehow)... make a new method.
4620:
4621: =cut
4622:
4623: sub completable {
4624: my $self = shift;
4625: if (!$self->is_problem()) { return 0; }
4626: my $partCount = $self->countParts();
4627:
4628: foreach my $part (@{$self->parts()}) {
4629: if ($part eq '0' && $partCount != 1) { next; }
4630: my $status = $self->status($part);
4631: # "If any of the parts are open, or have tries left (implies open),
4632: # and it is not "attempted" (manually graded problem), it is
4633: # not "complete"
4634: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4635: $status == ANSWER_SUBMITTED() ) {
4636: # did this part already, as well as we can
4637: next;
4638: }
4639: if ($status == OPEN() || $status == TRIES_LEFT()) {
4640: return 1;
4641: }
4642: }
4643:
4644: # If all the parts were complete, so was this problem.
4645: return 0;
4646: }
4647:
4648: =pod
4649:
4650: =head2 Resource/Nav Map Navigation
4651:
4652: =over 4
4653:
4654: =item * B<getNext>():
4655:
4656: Retreive an array of the possible next resources after this
4657: one. Always returns an array, even in the one- or zero-element case.
4658:
4659: =item * B<getPrevious>():
4660:
4661: Retreive an array of the possible previous resources from this
4662: one. Always returns an array, even in the one- or zero-element case.
4663:
4664: =cut
4665:
4666: sub getNext {
4667: my $self = shift;
4668: my @branches;
4669: my $to = $self->to();
4670: foreach my $branch ( split(/,/, $to) ) {
4671: my $choice = $self->{NAV_MAP}->getById($branch);
4672: my $next = $choice->goesto();
4673: $next = $self->{NAV_MAP}->getById($next);
4674:
4675: push @branches, $next;
4676: }
4677: return \@branches;
4678: }
4679:
4680: sub getPrevious {
4681: my $self = shift;
4682: my @branches;
4683: my $from = $self->from();
4684: foreach my $branch ( split /,/, $from) {
4685: my $choice = $self->{NAV_MAP}->getById($branch);
4686: my $prev = $choice->comesfrom();
4687: $prev = $self->{NAV_MAP}->getById($prev);
4688:
4689: push @branches, $prev;
4690: }
4691: return \@branches;
4692: }
4693:
4694: sub browsePriv {
4695: my $self = shift;
4696: if (defined($self->{BROWSE_PRIV})) {
4697: return $self->{BROWSE_PRIV};
4698: }
4699:
4700: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4701: }
4702:
4703: =pod
4704:
4705: =back
4706:
4707: =cut
4708:
4709: 1;
4710:
4711: __END__
4712:
4713:
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