1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.298 2004/09/29 19:13:20 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 used
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: $navmap->untieHashes();
414:
415: # If no resources were printed, print a reassuring message so the
416: # user knows there was no error.
417: if ($renderArgs->{'counter'} == 0) {
418: if ($showOnlyHomework) {
419: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
420: } else { # both jumpToFirstHomework and normal use the same: course must be empty
421: $r->print("<p><font size='+1'>This course is empty.</font></p>");
422: }
423: }
424:
425: $r->print("</body></html>");
426: $r->rflush();
427:
428: return OK;
429: }
430:
431: # Convenience functions: Returns a string that adds or subtracts
432: # the second argument from the first hash, appropriate for the
433: # query string that determines which folders to recurse on
434: sub addToFilter {
435: my $hashIn = shift;
436: my $addition = shift;
437: my %hash = %$hashIn;
438: $hash{$addition} = 1;
439:
440: return join (",", keys(%hash));
441: }
442:
443: sub removeFromFilter {
444: my $hashIn = shift;
445: my $subtraction = shift;
446: my %hash = %$hashIn;
447:
448: delete $hash{$subtraction};
449: return join(",", keys(%hash));
450: }
451:
452: # Convenience function: Given a stack returned from getStack on the iterator,
453: # return the correct src() value.
454: # Later, this should add an anchor when we start putting anchors in pages.
455: sub getLinkForResource {
456: my $stack = shift;
457: my $res;
458:
459: # Check to see if there are any pages in the stack
460: foreach $res (@$stack) {
461: if (defined($res)) {
462: if ($res->is_page()) {
463: return $res->src();
464: }
465: # in case folder was skipped over as "only sequence"
466: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
467: if ($map=~/\.page$/) {
468: return &Apache::lonnet::clutter($map).'#'.
469: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
470: }
471: }
472: }
473:
474: # Failing that, return the src of the last resource that is defined
475: # (when we first recurse on a map, it puts an undefined resource
476: # on the bottom because $self->{HERE} isn't defined yet, and we
477: # want the src for the map anyhow)
478: foreach (@$stack) {
479: if (defined($_)) { $res = $_; }
480: }
481:
482: return $res->src();
483: }
484:
485: # Convenience function: This separates the logic of how to create
486: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
487: # etc.) into a separate function. It takes a resource object as the
488: # first parameter, and the part number of the resource as the second.
489: # It's basically a big switch statement on the status of the resource.
490:
491: sub getDescription {
492: my $res = shift;
493: my $part = shift;
494: my $status = $res->status($part);
495:
496: if ($status == $res->NETWORK_FAILURE) {
497: return &mt("Having technical difficulties; please check status later");
498: }
499: if ($status == $res->NOTHING_SET) {
500: return &mt("Not currently assigned.");
501: }
502: if ($status == $res->OPEN_LATER) {
503: return "Open " . timeToHumanString($res->opendate($part));
504: }
505: if ($status == $res->OPEN) {
506: if ($res->duedate($part)) {
507: return &mt("Due")." " .timeToHumanString($res->duedate($part));
508: } else {
509: return &mt("Open, no due date");
510: }
511: }
512: if ($status == $res->PAST_DUE_ANSWER_LATER) {
513: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
514: }
515: if ($status == $res->PAST_DUE_NO_ANSWER) {
516: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
517: }
518: if ($status == $res->ANSWER_OPEN) {
519: return &mt("Answer available");
520: }
521: if ($status == $res->EXCUSED) {
522: return &mt("Excused by instructor");
523: }
524: if ($status == $res->ATTEMPTED) {
525: return &mt("Answer submitted, not yet graded");
526: }
527: if ($status == $res->TRIES_LEFT) {
528: my $tries = $res->tries($part);
529: my $maxtries = $res->maxtries($part);
530: my $triesString = "";
531: if ($tries && $maxtries) {
532: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
533: if ($maxtries > 1 && $maxtries - $tries == 1) {
534: $triesString = "<b>$triesString</b>";
535: }
536: }
537: if ($res->duedate($part)) {
538: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
539: " $triesString";
540: } else {
541: return &mt("No due date")." $triesString";
542: }
543: }
544: if ($status == $res->ANSWER_SUBMITTED) {
545: return &mt('Answer submitted');
546: }
547: }
548:
549: # Convenience function, so others can use it: Is the problem due in less then
550: # 24 hours, and still can be done?
551:
552: sub dueInLessThan24Hours {
553: my $res = shift;
554: my $part = shift;
555: my $status = $res->status($part);
556:
557: return ($status == $res->OPEN() ||
558: $status == $res->TRIES_LEFT()) &&
559: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
560: $res->duedate($part) > time();
561: }
562:
563: # Convenience function, so others can use it: Is there only one try remaining for the
564: # part, with more then one try to begin with, not due yet and still can be done?
565: sub lastTry {
566: my $res = shift;
567: my $part = shift;
568:
569: my $tries = $res->tries($part);
570: my $maxtries = $res->maxtries($part);
571: return $tries && $maxtries && $maxtries > 1 &&
572: $maxtries - $tries == 1 && $res->duedate($part) &&
573: $res->duedate($part) > time();
574: }
575:
576: # This puts a human-readable name on the ENV variable.
577:
578: sub advancedUser {
579: return $ENV{'request.role.adv'};
580: }
581:
582:
583: # timeToHumanString takes a time number and converts it to a
584: # human-readable representation, meant to be used in the following
585: # manner:
586: # print "Due $timestring"
587: # print "Open $timestring"
588: # print "Answer available $timestring"
589: # Very, very, very, VERY English-only... goodness help a localizer on
590: # this func...
591: sub timeToHumanString {
592: my ($time) = @_;
593: # zero, '0' and blank are bad times
594: if (!$time) {
595: return &mt('never');
596: }
597: unless (&Apache::lonlocal::current_language()=~/^en/) {
598: return &Apache::lonlocal::locallocaltime($time);
599: }
600: my $now = time();
601:
602: my @time = localtime($time);
603: my @now = localtime($now);
604:
605: # Positive = future
606: my $delta = $time - $now;
607:
608: my $minute = 60;
609: my $hour = 60 * $minute;
610: my $day = 24 * $hour;
611: my $week = 7 * $day;
612: my $inPast = 0;
613:
614: # Logic in comments:
615: # Is it now? (extremely unlikely)
616: if ( $delta == 0 ) {
617: return "this instant";
618: }
619:
620: if ($delta < 0) {
621: $inPast = 1;
622: $delta = -$delta;
623: }
624:
625: if ( $delta > 0 ) {
626:
627: my $tense = $inPast ? " ago" : "";
628: my $prefix = $inPast ? "" : "in ";
629:
630: # Less then a minute
631: if ( $delta < $minute ) {
632: if ($delta == 1) { return "${prefix}1 second$tense"; }
633: return "$prefix$delta seconds$tense";
634: }
635:
636: # Less then an hour
637: if ( $delta < $hour ) {
638: # If so, use minutes
639: my $minutes = floor($delta / 60);
640: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
641: return "$prefix$minutes minutes$tense";
642: }
643:
644: # Is it less then 24 hours away? If so,
645: # display hours + minutes
646: if ( $delta < $hour * 24) {
647: my $hours = floor($delta / $hour);
648: my $minutes = floor(($delta % $hour) / $minute);
649: my $hourString = "$hours hours";
650: my $minuteString = ", $minutes minutes";
651: if ($hours == 1) {
652: $hourString = "1 hour";
653: }
654: if ($minutes == 1) {
655: $minuteString = ", 1 minute";
656: }
657: if ($minutes == 0) {
658: $minuteString = "";
659: }
660: return "$prefix$hourString$minuteString$tense";
661: }
662:
663: # Less then 5 days away, display day of the week and
664: # HH:MM
665: if ( $delta < $day * 5 ) {
666: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
667: $timeStr =~ s/12:00 am/00:00/;
668: $timeStr =~ s/12:00 pm/noon/;
669: return ($inPast ? "last " : "next ") .
670: $timeStr;
671: }
672:
673: # Is it this year?
674: if ( $time[5] == $now[5]) {
675: # Return on Month Day, HH:MM meridian
676: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
677: $timeStr =~ s/12:00 am/00:00/;
678: $timeStr =~ s/12:00 pm/noon/;
679: return $timeStr;
680: }
681:
682: # Not this year, so show the year
683: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
684: $timeStr =~ s/12:00 am/00:00/;
685: $timeStr =~ s/12:00 pm/noon/;
686: return $timeStr;
687: }
688: }
689:
690:
691: =pod
692:
693: =head1 NAME
694:
695: Apache::lonnavmap - Subroutines to handle and render the navigation
696: maps
697:
698: =head1 SYNOPSIS
699:
700: The main handler generates the navigational listing for the course,
701: the other objects export this information in a usable fashion for
702: other modules.
703:
704: =head1 OVERVIEW
705:
706: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
707: course structure and caches it in what is often referred to as the
708: "big hash" X<big hash>. You can see it if you are logged into
709: LON-CAPA, in a course, by going to /adm/test. (You may need to
710: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
711: content of the hash will be under the heading "Big Hash".
712:
713: Big Hash contains, among other things, how resources are related
714: to each other (next/previous), what resources are maps, which
715: resources are being chosen to not show to the student (for random
716: selection), and a lot of other things that can take a lot of time
717: to compute due to the amount of data that needs to be collected and
718: processed.
719:
720: Apache::lonnavmaps provides an object model for manipulating this
721: information in a higher-level fashion then directly manipulating
722: the hash. It also provides access to several auxilary functions
723: that aren't necessarily stored in the Big Hash, but are a per-
724: resource sort of value, like whether there is any feedback on
725: a given resource.
726:
727: Apache::lonnavmaps also abstracts away branching, and someday,
728: conditions, for the times where you don't really care about those
729: things.
730:
731: Apache::lonnavmaps also provides fairly powerful routines for
732: rendering navmaps, and last but not least, provides the navmaps
733: view for when the user clicks the NAV button.
734:
735: B<Note>: Apache::lonnavmaps I<only> works for the "currently
736: logged in user"; if you want things like "due dates for another
737: student" lonnavmaps can not directly retrieve information like
738: that. You need the EXT function. This module can still help,
739: because many things, such as the course structure, are constant
740: between users, and Apache::lonnavmaps can help by providing
741: symbs for the EXT call.
742:
743: The rest of this file will cover the provided rendering routines,
744: which can often be used without fiddling with the navmap object at
745: all, then documents the Apache::lonnavmaps::navmap object, which
746: is the key to accessing the Big Hash information, covers the use
747: of the Iterator (which provides the logic for traversing the
748: somewhat-complicated Big Hash data structure), documents the
749: Apache::lonnavmaps::Resource objects that are returned by
750:
751: =head1 Subroutine: render
752:
753: The navmap renderer package provides a sophisticated rendering of the
754: standard navigation maps interface into HTML. The provided nav map
755: handler is actually just a glorified call to this.
756:
757: Because of the large number of parameters this function accepts,
758: instead of passing it arguments as is normal, pass it in an anonymous
759: hash with the desired options.
760:
761: The package provides a function called 'render', called as
762: Apache::lonnavmaps::render({}).
763:
764: =head2 Overview of Columns
765:
766: The renderer will build an HTML table for the navmap and return
767: it. The table is consists of several columns, and a row for each
768: resource (or possibly each part). You tell the renderer how many
769: columns to create and what to place in each column, optionally using
770: one or more of the prepared columns, and the renderer will assemble
771: the table.
772:
773: Any additional generally useful column types should be placed in the
774: renderer code here, so anybody can use it anywhere else. Any code
775: specific to the current application (such as the addition of <input>
776: elements in a column) should be placed in the code of the thing using
777: the renderer.
778:
779: At the core of the renderer is the array reference COLS (see Example
780: section below for how to pass this correctly). The COLS array will
781: consist of entries of one of two types of things: Either an integer
782: representing one of the pre-packaged column types, or a sub reference
783: that takes a resource reference, a part number, and a reference to the
784: argument hash passed to the renderer, and returns a string that will
785: be inserted into the HTML representation as it.
786:
787: All other parameters are ways of either changing how the columns
788: are printing, or which rows are shown.
789:
790: The pre-packaged column names are refered to by constants in the
791: Apache::lonnavmaps namespace. The following currently exist:
792:
793: =over 4
794:
795: =item * B<Apache::lonnavmaps::resource>:
796:
797: The general info about the resource: Link, icon for the type, etc. The
798: first column in the standard nav map display. This column provides the
799: indentation effect seen in the B<NAV> screen. This column also accepts
800: the following parameters in the renderer hash:
801:
802: =over 4
803:
804: =item * B<resource_nolink>: default false
805:
806: If true, the resource will not be linked. By default, all non-folder
807: resources are linked.
808:
809: =item * B<resource_part_count>: default true
810:
811: If true, the resource will show a part count B<if> the full
812: part list is not displayed. (See "condense_parts" later.) If false,
813: the resource will never show a part count.
814:
815: =item * B<resource_no_folder_link>:
816:
817: If true, the resource's folder will not be clickable to open or close
818: it. Default is false. True implies printCloseAll is false, since you
819: can't close or open folders when this is on anyhow.
820:
821: =back
822:
823: =item * B<Apache::lonnavmaps::communication_status>:
824:
825: Whether there is discussion on the resource, email for the user, or
826: (lumped in here) perl errors in the execution of the problem. This is
827: the second column in the main nav map.
828:
829: =item * B<Apache::lonnavmaps::quick_status>:
830:
831: An icon for the status of a problem, with five possible states:
832: Correct, incorrect, open, awaiting grading (for a problem where the
833: computer's grade is suppressed, or the computer can't grade, like
834: essay problem), or none (not open yet, not a problem). The
835: third column of the standard navmap.
836:
837: =item * B<Apache::lonnavmaps::long_status>:
838:
839: A text readout of the details of the current status of the problem,
840: such as "Due in 22 hours". The fourth column of the standard navmap.
841:
842: =item * B<Apache::lonnavmaps::part_status_summary>:
843:
844: A text readout summarizing the status of the problem. If it is a
845: single part problem, will display "Correct", "Incorrect",
846: "Not yet open", "Open", "Attempted", or "Error". If there are
847: multiple parts, this will output a string that in HTML will show a
848: status of how many parts are in each status, in color coding, trying
849: to match the colors of the icons within reason.
850:
851: Note this only makes sense if you are I<not> showing parts. If
852: C<showParts> is true (see below), this column will not output
853: anything.
854:
855: =back
856:
857: If you add any others please be sure to document them here.
858:
859: An example of a column renderer that will show the ID number of a
860: resource, along with the part name if any:
861:
862: sub {
863: my ($resource, $part, $params) = @_;
864: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
865: return '<td>' . $resource->{ID} . '</td>';
866: }
867:
868: Note these functions are responsible for the TD tags, which allow them
869: to override vertical and horizontal alignment, etc.
870:
871: =head2 Parameters
872:
873: Minimally, you should be
874: able to get away with just using 'cols' (to specify the columns
875: shown), 'url' (necessary for the folders to link to the current screen
876: correctly), and possibly 'queryString' if your app calls for it. In
877: that case, maintaining the state of the folders will be done
878: automatically.
879:
880: =over 4
881:
882: =item * B<iterator>: default: constructs one from %ENV
883:
884: A reference to a fresh ::iterator to use from the navmaps. The
885: rendering will reflect the options passed to the iterator, so you can
886: use that to just render a certain part of the course, if you like. If
887: one is not passed, the renderer will attempt to construct one from
888: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
889: 'iterator_map' parameter if any.
890:
891: =item * B<iterator_map>: default: not used
892:
893: If you are letting the renderer do the iterator handling, you can
894: instruct the renderer to render only a particular map by passing it
895: the source of the map you want to process, like
896: '/res/103/jerf/navmap.course.sequence'.
897:
898: =item * B<navmap>: default: constructs one from %ENV
899:
900: A reference to a navmap, used only if an iterator is not passed in. If
901: this is necessary to make an iterator but it is not passed in, a new
902: one will be constructed based on ENV info. This is useful to do basic
903: error checking before passing it off to render.
904:
905: =item * B<r>: default: must be passed in
906:
907: The standard Apache response object. This must be passed to the
908: renderer or the course hash will be locked.
909:
910: =item * B<cols>: default: empty (useless)
911:
912: An array reference
913:
914: =item * B<showParts>:default true
915:
916: A flag. If true, a line for the resource itself, and a line
917: for each part will be displayed. If not, only one line for each
918: resource will be displayed.
919:
920: =item * B<condenseParts>: default true
921:
922: A flag. If true, if all parts of the problem have the same
923: status and that status is Nothing Set, Correct, or Network Failure,
924: then only one line will be displayed for that resource anyhow. If no,
925: all parts will always be displayed. If showParts is 0, this is
926: ignored.
927:
928: =item * B<jumpCount>: default: determined from %ENV
929:
930: A string identifying the URL to place the anchor 'curloc' at.
931: It is the responsibility of the renderer user to
932: ensure that the #curloc is in the URL. By default, determined through
933: the use of the ENV{} 'jump' information, and should normally "just
934: work" correctly.
935:
936: =item * B<here>: default: empty string
937:
938: A Symb identifying where to place the 'here' marker. The empty
939: string means no marker.
940:
941: =item * B<indentString>: default: 25 pixel whitespace image
942:
943: A string identifying the indentation string to use.
944:
945: =item * B<queryString>: default: empty
946:
947: A string which will be prepended to the query string used when the
948: folders are opened or closed. You can use this to pass
949: application-specific values.
950:
951: =item * B<url>: default: none
952:
953: The url the folders will link to, which should be the current
954: page. Required if the resource info column is shown, and you
955: are allowing the user to open and close folders.
956:
957: =item * B<currentJumpIndex>: default: no jumping
958:
959: Describes the currently-open row number to cause the browser to jump
960: to, because the user just opened that folder. By default, pulled from
961: the Jump information in the ENV{'form.*'}.
962:
963: =item * B<printKey>: default: false
964:
965: If true, print the key that appears on the top of the standard
966: navmaps.
967:
968: =item * B<printCloseAll>: default: true
969:
970: If true, print the "Close all folders" or "open all folders"
971: links.
972:
973: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
974:
975: A function that takes the resource object as its only parameter and
976: returns a true or false value. If true, the resource is displayed. If
977: false, it is simply skipped in the display.
978:
979: =item * B<suppressEmptySequences>: default: false
980:
981: If you're using a filter function, and displaying sequences to orient
982: the user, then frequently some sequences will be empty. Setting this to
983: true will cause those sequences not to display, so as not to confuse the
984: user into thinking that if the sequence is there there should be things
985: under it; for example, see the "Show Uncompleted Homework" view on the
986: B<NAV> screen.
987:
988: =item * B<suppressNavmaps>: default: false
989:
990: If true, will not display Navigate Content resources.
991:
992: =back
993:
994: =head2 Additional Info
995:
996: In addition to the parameters you can pass to the renderer, which will
997: be passed through unchange to the column renderers, the renderer will
998: generate the following information which your renderer may find
999: useful:
1000:
1001: =over 4
1002:
1003: =item * B<counter>:
1004:
1005: Contains the number of rows printed. Useful after calling the render
1006: function, as you can detect whether anything was printed at all.
1007:
1008: =item * B<isNewBranch>:
1009:
1010: Useful for renderers: If this resource is currently the first resource
1011: of a new branch, this will be true. The Resource column (leftmost in the
1012: navmaps screen) uses this to display the "new branch" icon
1013:
1014: =back
1015:
1016: =cut
1017:
1018: sub resource { return 0; }
1019: sub communication_status { return 1; }
1020: sub quick_status { return 2; }
1021: sub long_status { return 3; }
1022: sub part_status_summary { return 4; }
1023:
1024: sub render_resource {
1025: my ($resource, $part, $params) = @_;
1026:
1027: my $nonLinkedText = ''; # stuff after resource title not in link
1028:
1029: my $link = $params->{"resourceLink"};
1030: my $src = $resource->src();
1031: my $it = $params->{"iterator"};
1032: my $filter = $it->{FILTER};
1033:
1034: my $title = $resource->compTitle();
1035:
1036: my $partLabel = "";
1037: my $newBranchText = "";
1038: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1039: # If this is a new branch, label it so
1040: if ($params->{'isNewBranch'}) {
1041: $newBranchText = "<img src='$location/branch.gif' border='0' />";
1042: }
1043:
1044: # links to open and close the folder
1045: my $linkopen = "<a href='$link'>";
1046: my $linkclose = "</a>";
1047:
1048: # Default icon: unknown page
1049: my $icon = "<img src='$location/unknown.gif' alt='' border='0' />";
1050:
1051: if ($resource->is_problem()) {
1052: if ($part eq '0' || $params->{'condensed'}) {
1053: $icon ='<img src="'.$location.'/problem.gif" alt="" border="0" />';
1054: } else {
1055: $icon = $params->{'indentString'};
1056: }
1057: } else {
1058: $icon = "<img src='".&Apache::loncommon::lonhttpdurl(&Apache::loncommon::icon($resource->src))."' alt='' border='0' />";
1059: }
1060:
1061: # Display the correct map icon to open or shut map
1062: if ($resource->is_map()) {
1063: my $mapId = $resource->map_pc();
1064: my $nowOpen = !defined($filter->{$mapId});
1065: if ($it->{CONDITION}) {
1066: $nowOpen = !$nowOpen;
1067: }
1068:
1069: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1070:
1071: if (!$params->{'resource_no_folder_link'}) {
1072: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1073: $icon = "<img src='$location/$icon' alt='' border='0' />";
1074:
1075: $linkopen = "<a href='" . $params->{'url'} . '?' .
1076: $params->{'queryString'} . '&filter=';
1077: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1078: addToFilter($filter, $mapId) :
1079: removeFromFilter($filter, $mapId);
1080: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1081: . $params->{'hereType'} . '&here=' .
1082: &Apache::lonnet::escape($params->{'here'}) .
1083: '&jump=' .
1084: &Apache::lonnet::escape($resource->symb()) .
1085: "&folderManip=1'>";
1086: } else {
1087: # Don't allow users to manipulate folder
1088: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1089: '.nomanip.gif';
1090: $icon = "<img src='$location/$icon' alt='' border='0' />";
1091:
1092: $linkopen = "";
1093: $linkclose = "";
1094: }
1095: }
1096:
1097: if ($resource->randomout()) {
1098: $nonLinkedText .= ' <i>(hidden)</i> ';
1099: }
1100:
1101: # We're done preparing and finally ready to start the rendering
1102: my $result = "<td align='left' valign='center'>";
1103:
1104: my $indentLevel = $params->{'indentLevel'};
1105: if ($newBranchText) { $indentLevel--; }
1106:
1107: # print indentation
1108: for (my $i = 0; $i < $indentLevel; $i++) {
1109: $result .= $params->{'indentString'};
1110: }
1111:
1112: # Decide what to display
1113: $result .= "$newBranchText$linkopen$icon$linkclose";
1114:
1115: my $curMarkerBegin = '';
1116: my $curMarkerEnd = '';
1117:
1118: # Is this the current resource?
1119: if (!$params->{'displayedHereMarker'} &&
1120: $resource->symb() eq $params->{'here'} ) {
1121: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1122: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1123: $params->{'displayedHereMarker'} = 1;
1124: }
1125:
1126: if ($resource->is_problem() && $part ne '0' &&
1127: !$params->{'condensed'}) {
1128: my $displaypart=$resource->part_display($part);
1129: $partLabel = " (Part: $displaypart)";
1130: $link.='#'.&Apache::lonnet::escape($part);
1131: $title = "";
1132: }
1133:
1134: if ($params->{'condensed'} && $resource->countParts() > 1) {
1135: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1136: }
1137:
1138: my $target;
1139: if ($ENV{'environment.remotenavmap'} eq 'on') {
1140: $target=' target="loncapaclient" ';
1141: }
1142: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1143: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1144: } else {
1145: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1146: }
1147:
1148: return $result;
1149: }
1150:
1151: sub render_communication_status {
1152: my ($resource, $part, $params) = @_;
1153: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1154:
1155: my $link = $params->{"resourceLink"};
1156: my $linkopen = "<a href='$link'>";
1157: my $linkclose = "</a>";
1158: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1159: if ($resource->hasDiscussion()) {
1160: $discussionHTML = $linkopen .
1161: '<img border="0" src="'.$location.'/chat.gif" />' .
1162: $linkclose;
1163: }
1164:
1165: if ($resource->getFeedback()) {
1166: my $feedback = $resource->getFeedback();
1167: foreach (split(/\,/, $feedback)) {
1168: if ($_) {
1169: $feedbackHTML .= ' <a href="/adm/email?display='
1170: . &Apache::lonnet::escape($_) . '">'
1171: . '<img src="'.$location.'/feedback.gif" '
1172: . 'border="0" /></a>';
1173: }
1174: }
1175: }
1176:
1177: if ($resource->getErrors()) {
1178: my $errors = $resource->getErrors();
1179: my $errorcount = 0;
1180: foreach (split(/,/, $errors)) {
1181: last if ($errorcount>=10); # Only output 10 bombs maximum
1182: if ($_) {
1183: $errorcount++;
1184: $errorHTML .= ' <a href="/adm/email?display='
1185: . &Apache::lonnet::escape($_) . '">'
1186: . '<img src="'.$location.'/bomb.gif" '
1187: . 'border="0" /></a>';
1188: }
1189: }
1190: }
1191:
1192: if ($params->{'multipart'} && $part != '0') {
1193: $discussionHTML = $feedbackHTML = $errorHTML = '';
1194: }
1195:
1196: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1197:
1198: }
1199: sub render_quick_status {
1200: my ($resource, $part, $params) = @_;
1201: my $result = "";
1202: my $firstDisplayed = !$params->{'condensed'} &&
1203: $params->{'multipart'} && $part eq "0";
1204:
1205: my $link = $params->{"resourceLink"};
1206: my $linkopen = "<a href='$link'>";
1207: my $linkclose = "</a>";
1208:
1209: if ($resource->is_problem() &&
1210: !$firstDisplayed) {
1211:
1212: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1213: my $alt = $iconAltTags{$icon};
1214: if ($icon) {
1215: my $location=
1216: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1217: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1218: } else {
1219: $result .= "<td width='30'> </td>\n";
1220: }
1221: } else { # not problem, no icon
1222: $result .= "<td width='30'> </td>\n";
1223: }
1224:
1225: return $result;
1226: }
1227: sub render_long_status {
1228: my ($resource, $part, $params) = @_;
1229: my $result = "<td align='right' valign='center'>\n";
1230: my $firstDisplayed = !$params->{'condensed'} &&
1231: $params->{'multipart'} && $part eq "0";
1232:
1233: my $color;
1234: if ($resource->is_problem()) {
1235: $color = $colormap{$resource->status};
1236:
1237: if (dueInLessThan24Hours($resource, $part) ||
1238: lastTry($resource, $part)) {
1239: $color = $hurryUpColor;
1240: }
1241: }
1242:
1243: if ($resource->kind() eq "res" &&
1244: $resource->is_problem() &&
1245: !$firstDisplayed) {
1246: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1247: $result .= getDescription($resource, $part);
1248: if ($color) {$result .= "</b></font>"; }
1249: }
1250: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1251: $result .= '(randomly select ' . $resource->randompick() .')';
1252: }
1253:
1254: # Debugging code
1255: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1256: # ' - Part: ' . $part;
1257:
1258: $result .= "</td>\n";
1259:
1260: return $result;
1261: }
1262:
1263: # Colors obtained by taking the icons, matching the colors, and
1264: # possibly reducing the Value (HSV) of the color, if it's too bright
1265: # for text, generally by one third or so.
1266: my %statusColors =
1267: (
1268: $resObj->CLOSED => '#000000',
1269: $resObj->OPEN => '#998b13',
1270: $resObj->CORRECT => '#26933f',
1271: $resObj->INCORRECT => '#c48207',
1272: $resObj->ATTEMPTED => '#a87510',
1273: $resObj->ERROR => '#000000'
1274: );
1275: my %statusStrings =
1276: (
1277: $resObj->CLOSED => 'Not yet open',
1278: $resObj->OPEN => 'Open',
1279: $resObj->CORRECT => 'Correct',
1280: $resObj->INCORRECT => 'Incorrect',
1281: $resObj->ATTEMPTED => 'Attempted',
1282: $resObj->ERROR => 'Network Error'
1283: );
1284: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1285:
1286: use Data::Dumper;
1287: sub render_parts_summary_status {
1288: my ($resource, $part, $params) = @_;
1289: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1290: if ($params->{showParts}) {
1291: return '<td></td>';
1292: }
1293:
1294: my $td = "<td align='right'>\n";
1295: my $endtd = "</td>\n";
1296: my @probs;
1297:
1298: if ($resource->contains_problem) {
1299: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1300: } else {
1301: @probs=($resource);
1302: }
1303: my $return;
1304: my %overallstatus;
1305: my $totalParts;
1306: foreach my $resource (@probs) {
1307: # If there is a single part, just show the simple status
1308: if ($resource->singlepart()) {
1309: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1310: $overallstatus{$status}++;
1311: $totalParts++;
1312: next;
1313: }
1314: # Now we can be sure the $part doesn't really matter.
1315: my $statusCount = $resource->simpleStatusCount();
1316: my @counts;
1317: foreach my $status (@statuses) {
1318: # decouple display order from the simpleStatusCount order
1319: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1320: if ($statusCount->[$slot]) {
1321: $overallstatus{$status}+=$statusCount->[$slot];
1322: $totalParts+=$statusCount->[$slot];
1323: }
1324: }
1325: }
1326: $return.= $td . $totalParts . ' parts: ';
1327: foreach my $status (@statuses) {
1328: if ($overallstatus{$status}) {
1329: $return.="<font color='" . $statusColors{$status} .
1330: "'>" . $overallstatus{$status} . ' '
1331: . $statusStrings{$status} . "</font>";
1332: }
1333: }
1334: $return.= $endtd;
1335: return $return;
1336: }
1337:
1338: my @preparedColumns = (\&render_resource, \&render_communication_status,
1339: \&render_quick_status, \&render_long_status,
1340: \&render_parts_summary_status);
1341:
1342: sub setDefault {
1343: my ($val, $default) = @_;
1344: if (!defined($val)) { return $default; }
1345: return $val;
1346: }
1347:
1348: sub cmp_title {
1349: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1350: $atitle=~s/^\s*//;
1351: $btitle=~s/^\s*//;
1352: return $atitle cmp $btitle;
1353: }
1354:
1355: sub render {
1356: my $args = shift;
1357: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1358: my $result = '';
1359: # Configure the renderer.
1360: my $cols = $args->{'cols'};
1361: if (!defined($cols)) {
1362: # no columns, no nav maps.
1363: return '';
1364: }
1365: my $mustCloseNavMap = 0;
1366: my $navmap;
1367: if (defined($args->{'navmap'})) {
1368: $navmap = $args->{'navmap'};
1369: }
1370:
1371: my $r = $args->{'r'};
1372: my $queryString = $args->{'queryString'};
1373: my $jump = $args->{'jump'};
1374: my $here = $args->{'here'};
1375: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1376: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1377: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1378: # before the current resource when using #current
1379:
1380: # If we were passed 'here' information, we are not rendering
1381: # after a folder manipulation, and we were not passed an
1382: # iterator, make sure we open the folders to show the "here"
1383: # marker
1384: my $filterHash = {};
1385: # Figure out what we're not displaying
1386: foreach (split(/\,/, $ENV{"form.filter"})) {
1387: if ($_) {
1388: $filterHash->{$_} = "1";
1389: }
1390: }
1391:
1392: # Filter: Remember filter function and add our own filter: Refuse
1393: # to show hidden resources unless the user can see them.
1394: my $userCanSeeHidden = advancedUser();
1395: my $filterFunc = setDefault($args->{'filterFunc'},
1396: sub {return 1;});
1397: if (!$userCanSeeHidden) {
1398: # Without renaming the filterfunc, the server seems to go into
1399: # an infinite loop
1400: my $oldFilterFunc = $filterFunc;
1401: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1402: &$oldFilterFunc($res);};
1403: }
1404:
1405: my $condition = 0;
1406: if ($ENV{'form.condition'}) {
1407: $condition = 1;
1408: }
1409:
1410: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1411: # Step 1: Check to see if we have a navmap
1412: if (!defined($navmap)) {
1413: $navmap = Apache::lonnavmaps::navmap->new();
1414: $mustCloseNavMap = 1;
1415: }
1416:
1417: # Step two: Locate what kind of here marker is necessary
1418: # Determine where the "here" marker is and where the screen jumps to.
1419:
1420: if ($ENV{'form.postsymb'}) {
1421: $here = $jump = $ENV{'form.postsymb'};
1422: } elsif ($ENV{'form.postdata'}) {
1423: # couldn't find a symb, is there a URL?
1424: my $currenturl = $ENV{'form.postdata'};
1425: #$currenturl=~s/^http\:\/\///;
1426: #$currenturl=~s/^[^\/]+//;
1427:
1428: $here = $jump = &Apache::lonnet::symbread($currenturl);
1429: }
1430:
1431: # Step three: Ensure the folders are open
1432: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1433: my $curRes;
1434: my $found = 0;
1435:
1436: # We only need to do this if we need to open the maps to show the
1437: # current position. This will change the counter so we can't count
1438: # for the jump marker with this loop.
1439: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1440: if (ref($curRes) && $curRes->symb() eq $here) {
1441: my $mapStack = $mapIterator->getStack();
1442:
1443: # Ensure the parent maps are open
1444: for my $map (@{$mapStack}) {
1445: if ($condition) {
1446: undef $filterHash->{$map->map_pc()};
1447: } else {
1448: $filterHash->{$map->map_pc()} = 1;
1449: }
1450: }
1451: $found = 1;
1452: }
1453: }
1454: }
1455:
1456: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1457: # If this is a click on a folder or something, we want to preserve the "here"
1458: # from the querystring, and get the new "jump" marker
1459: $here = $ENV{'form.here'};
1460: $jump = $ENV{'form.jump'};
1461: }
1462:
1463: my $it = $args->{'iterator'};
1464: if (!defined($it)) {
1465: # Construct a default iterator based on $ENV{'form.'} information
1466:
1467: # Step 1: Check to see if we have a navmap
1468: if (!defined($navmap)) {
1469: $navmap = Apache::lonnavmaps::navmap->new();
1470: $mustCloseNavMap = 1;
1471: }
1472:
1473: # See if we're being passed a specific map
1474: if ($args->{'iterator_map'}) {
1475: my $map = $args->{'iterator_map'};
1476: $map = $navmap->getResourceByUrl($map);
1477: my $firstResource = $map->map_start();
1478: my $finishResource = $map->map_finish();
1479:
1480: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1481: } else {
1482: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1483: }
1484: }
1485:
1486: # (re-)Locate the jump point, if any
1487: # Note this does not take filtering or hidden into account... need
1488: # to be fixed?
1489: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1490: my $curRes;
1491: my $foundJump = 0;
1492: my $counter = 0;
1493:
1494: while (($curRes = $mapIterator->next()) && !$foundJump) {
1495: if (ref($curRes)) { $counter++; }
1496:
1497: if (ref($curRes) && $jump eq $curRes->symb()) {
1498:
1499: # This is why we have to use the main iterator instead of the
1500: # potentially faster DFS: The count has to be the same, so
1501: # the order has to be the same, which DFS won't give us.
1502: $args->{'currentJumpIndex'} = $counter;
1503: $foundJump = 1;
1504: }
1505: }
1506:
1507: my $showParts = setDefault($args->{'showParts'}, 1);
1508: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1509: # keeps track of when the current resource is found,
1510: # so we can back up a few and put the anchor above the
1511: # current resource
1512: my $printKey = $args->{'printKey'};
1513: my $printCloseAll = $args->{'printCloseAll'};
1514: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1515:
1516: # Print key?
1517: if ($printKey) {
1518: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1519: my $date=localtime;
1520: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1521: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1522: if ($navmap->{LAST_CHECK}) {
1523: $result .=
1524: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1525: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1526: '</td><td align="center" valign="bottom"> '.
1527: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1528: '</td>';
1529: } else {
1530: $result .= '<td align="center" valign="bottom"> '.
1531: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1532: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1533: '</td>';
1534: }
1535:
1536: $result .= '</tr></table>';
1537: }
1538:
1539: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1540: my ($link,$text);
1541: if ($condition) {
1542: $link='"navmaps?condition=0&filter=&'.$queryString.
1543: '&here='.&Apache::lonnet::escape($here).'"';
1544: $text='Close All Folders';
1545: } else {
1546: $link='"navmaps?condition=1&filter=&'.$queryString.
1547: '&here='.&Apache::lonnet::escape($here).'"';
1548: $text='Open All Folders';
1549: }
1550: if ($args->{'caller'} eq 'navmapsdisplay') {
1551: &add_linkitem($args->{'linkitems'},'changefolder',
1552: 'location.href='.$link,$text);
1553: } else {
1554: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1555: }
1556: $result .= "\n";
1557: }
1558:
1559: # Check for any unread discussions in all resources.
1560: if ($args->{'caller'} eq 'navmapsdisplay') {
1561: &add_linkitem($args->{'linkitems'},'clearbubbles',
1562: 'document.clearbubbles.submit()',
1563: 'Mark all posts read');
1564: my $time=time;
1565: $result .= (<<END);
1566: <form name="clearbubbles" method="post" action="/adm/feedback">
1567: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1568: <input type="hidden" name="navtime" value="$time" />
1569: END
1570: if ($args->{'sort'} eq 'discussion') {
1571: my $totdisc = 0;
1572: my $haveDisc = '';
1573: my @allres=$navmap->retrieveResources();
1574: foreach my $resource (@allres) {
1575: if ($resource->hasDiscussion()) {
1576: my $ressymb;
1577: if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
1578: $ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
1579: } else {
1580: $ressymb = $resource->symb();
1581: }
1582: $haveDisc .= $ressymb.':';
1583: $totdisc ++;
1584: }
1585: }
1586: if ($totdisc > 0) {
1587: $haveDisc =~ s/:$//;
1588: my $navurl = $ENV{'QUERY_STRING'};
1589: $result .= (<<END);
1590: <input type="hidden" name="navmaps" value="$haveDisc" />
1591: </form>
1592: END
1593: }
1594: }
1595: $result.='</form>';
1596: }
1597:
1598: if ($args->{'caller'} eq 'navmapsdisplay') {
1599: $result .= '<table><tr><td>'.
1600: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1601: if ($ENV{'environment.remotenavmap'} ne 'on') {
1602: $result .= '<td> </td>';
1603: } else {
1604: $result .= '</tr><tr>';
1605: }
1606: $result.=&show_linkitems($args->{'linkitems'});
1607: if ($args->{'sort_html'}) {
1608: if ($ENV{'environment.remotenavmap'} ne 'on') {
1609: $result.='<td> </td><td> </td><td> </td>'.
1610: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1611: } else {
1612: $result.='</tr><tr><td align="left"><br />'.
1613: $args->{'sort_html'}.'</td></tr>';
1614: }
1615: }
1616: $result .= '</table>';
1617: } elsif ($args->{'sort_html'}) {
1618: $result.=$args->{'sort_html'};
1619: }
1620:
1621: $result .= "<br />\n";
1622: if ($r) {
1623: $r->print($result);
1624: $r->rflush();
1625: $result = "";
1626: }
1627: # End parameter setting
1628:
1629: # Data
1630: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1631: my $res = "Apache::lonnavmaps::resource";
1632: my %condenseStatuses =
1633: ( $res->NETWORK_FAILURE => 1,
1634: $res->NOTHING_SET => 1,
1635: $res->CORRECT => 1 );
1636: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1637:
1638: # Shared variables
1639: $args->{'counter'} = 0; # counts the rows
1640: $args->{'indentLevel'} = 0;
1641: $args->{'isNewBranch'} = 0;
1642: $args->{'condensed'} = 0;
1643: my $location=
1644: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1645: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='' border='0' />");
1646: $args->{'displayedHereMarker'} = 0;
1647:
1648: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1649: # since structure actually doesn't matter, except what map has what resources.
1650: if ($args->{'suppressEmptySequences'}) {
1651: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1652: $it->{FIRST_RESOURCE},
1653: $it->{FINISH_RESOURCE},
1654: {}, undef, 1);
1655: my $depth = 0;
1656: $dfsit->next();
1657: my $curRes = $dfsit->next();
1658: while ($depth > -1) {
1659: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1660: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1661:
1662: if (ref($curRes)) {
1663: # Parallel pre-processing: Do sequences have non-filtered-out children?
1664: if ($curRes->is_map()) {
1665: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1666: # Sequences themselves do not count as visible children,
1667: # unless those sequences also have visible children.
1668: # This means if a sequence appears, there's a "promise"
1669: # that there's something under it if you open it, somewhere.
1670: } else {
1671: # Not a sequence: if it's filtered, ignore it, otherwise
1672: # rise up the stack and mark the sequences as having children
1673: if (&$filterFunc($curRes)) {
1674: for my $sequence (@{$dfsit->getStack()}) {
1675: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1676: }
1677: }
1678: }
1679: }
1680: } continue {
1681: $curRes = $dfsit->next();
1682: }
1683: }
1684:
1685: my $displayedJumpMarker = 0;
1686: # Set up iteration.
1687: my $now = time();
1688: my $in24Hours = $now + 24 * 60 * 60;
1689: my $rownum = 0;
1690:
1691: # export "here" marker information
1692: $args->{'here'} = $here;
1693:
1694: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1695: my @resources;
1696: my $code='';# sub { !(shift->is_map();) };
1697: if ($args->{'sort'} eq 'title') {
1698: my $oldFilterFunc = $filterFunc;
1699: my $filterFunc=
1700: sub {
1701: my ($res)=@_;
1702: if ($res->is_map()) { return 0;}
1703: return &$oldFilterFunc($res);
1704: };
1705: @resources=$navmap->retrieveResources(undef,$filterFunc);
1706: @resources= sort { &cmp_title($a,$b) } @resources;
1707: } elsif ($args->{'sort'} eq 'duedate') {
1708: my $oldFilterFunc = $filterFunc;
1709: my $filterFunc=
1710: sub {
1711: my ($res)=@_;
1712: if (!$res->is_problem()) { return 0;}
1713: return &$oldFilterFunc($res);
1714: };
1715: @resources=$navmap->retrieveResources(undef,$filterFunc);
1716: @resources= sort {
1717: if ($a->duedate ne $b->duedate) {
1718: return $a->duedate cmp $b->duedate;
1719: }
1720: my $value=&cmp_title($a,$b);
1721: return $value;
1722: } @resources;
1723: } elsif ($args->{'sort'} eq 'discussion') {
1724: my $oldFilterFunc = $filterFunc;
1725: my $filterFunc=
1726: sub {
1727: my ($res)=@_;
1728: if (!$res->hasDiscussion() &&
1729: !$res->getFeedback() &&
1730: !$res->getErrors()) { return 0;}
1731: return &$oldFilterFunc($res);
1732: };
1733: @resources=$navmap->retrieveResources(undef,$filterFunc);
1734: @resources= sort { &cmp_title($a,$b) } @resources;
1735: } else {
1736: #unknow sort mechanism or default
1737: undef($args->{'sort'});
1738: }
1739:
1740:
1741: while (1) {
1742: if ($args->{'sort'}) {
1743: $curRes = shift(@resources);
1744: } else {
1745: $curRes = $it->next($closeAllPages);
1746: }
1747: if (!$curRes) { last; }
1748:
1749: # Maintain indentation level.
1750: if ($curRes == $it->BEGIN_MAP() ||
1751: $curRes == $it->BEGIN_BRANCH() ) {
1752: $args->{'indentLevel'}++;
1753: }
1754: if ($curRes == $it->END_MAP() ||
1755: $curRes == $it->END_BRANCH() ) {
1756: $args->{'indentLevel'}--;
1757: }
1758: # Notice new branches
1759: if ($curRes == $it->BEGIN_BRANCH()) {
1760: $args->{'isNewBranch'} = 1;
1761: }
1762:
1763: # If this isn't an actual resource, continue on
1764: if (!ref($curRes)) {
1765: next;
1766: }
1767:
1768: # If this has been filtered out, continue on
1769: if (!(&$filterFunc($curRes))) {
1770: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1771: next;
1772: }
1773:
1774: # If this is an empty sequence and we're filtering them, continue on
1775: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1776: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1777: next;
1778: }
1779:
1780: # If we're suppressing navmaps and this is a navmap, continue on
1781: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1782: next;
1783: }
1784:
1785: $args->{'counter'}++;
1786:
1787: # Does it have multiple parts?
1788: $args->{'multipart'} = 0;
1789: $args->{'condensed'} = 0;
1790: my @parts;
1791:
1792: # Decide what parts to show.
1793: if ($curRes->is_problem() && $showParts) {
1794: @parts = @{$curRes->parts()};
1795: $args->{'multipart'} = $curRes->multipart();
1796:
1797: if ($condenseParts) { # do the condensation
1798: if (!$curRes->opendate("0")) {
1799: @parts = ();
1800: $args->{'condensed'} = 1;
1801: }
1802: if (!$args->{'condensed'}) {
1803: # Decide whether to condense based on similarity
1804: my $status = $curRes->status($parts[0]);
1805: my $due = $curRes->duedate($parts[0]);
1806: my $open = $curRes->opendate($parts[0]);
1807: my $statusAllSame = 1;
1808: my $dueAllSame = 1;
1809: my $openAllSame = 1;
1810: for (my $i = 1; $i < scalar(@parts); $i++) {
1811: if ($curRes->status($parts[$i]) != $status){
1812: $statusAllSame = 0;
1813: }
1814: if ($curRes->duedate($parts[$i]) != $due ) {
1815: $dueAllSame = 0;
1816: }
1817: if ($curRes->opendate($parts[$i]) != $open) {
1818: $openAllSame = 0;
1819: }
1820: }
1821: # $*allSame is true if all the statuses were
1822: # the same. Now, if they are all the same and
1823: # match one of the statuses to condense, or they
1824: # are all open with the same due date, or they are
1825: # all OPEN_LATER with the same open date, display the
1826: # status of the first non-zero part (to get the 'correct'
1827: # status right, since 0 is never 'correct' or 'open').
1828: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1829: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1830: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1831: @parts = ($parts[0]);
1832: $args->{'condensed'} = 1;
1833: }
1834: }
1835: # Multipart problem with one part: always "condense" (happens
1836: # to match the desirable behavior)
1837: if ($curRes->countParts() == 1) {
1838: @parts = ($parts[0]);
1839: $args->{'condensed'} = 1;
1840: }
1841: }
1842: }
1843:
1844: # If the multipart problem was condensed, "forget" it was multipart
1845: if (scalar(@parts) == 1) {
1846: $args->{'multipart'} = 0;
1847: } else {
1848: # Add part 0 so we display it correctly.
1849: unshift @parts, '0';
1850: }
1851:
1852: # Now, we've decided what parts to show. Loop through them and
1853: # show them.
1854: foreach my $part (@parts) {
1855: $rownum ++;
1856: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1857:
1858: $result .= " <tr bgcolor='$backgroundColor'>\n";
1859:
1860: # Set up some data about the parts that the cols might want
1861: my $filter = $it->{FILTER};
1862: my $src;
1863: if ($args->{'sort'}) {
1864: $src = $curRes->src(); # FIXME this is wrong for .pages
1865: } else {
1866: my $stack = $it->getStack();
1867: $src=getLinkForResource($stack);
1868: }
1869: my $anchor='';
1870: if ($src=~s/(\#.*)$//) {
1871: $anchor=$1;
1872: }
1873: my $srcHasQuestion = $src =~ /\?/;
1874: $args->{"resourceLink"} = $src.
1875: ($srcHasQuestion?'&':'?') .
1876: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1877: $anchor;
1878:
1879: # Now, display each column.
1880: foreach my $col (@$cols) {
1881: my $colHTML = '';
1882: if (ref($col)) {
1883: $colHTML .= &$col($curRes, $part, $args);
1884: } else {
1885: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1886: }
1887:
1888: # If this is the first column and it's time to print
1889: # the anchor, do so
1890: if ($col == $cols->[0] &&
1891: $args->{'counter'} == $args->{'currentJumpIndex'} -
1892: $currentJumpDelta) {
1893: # Jam the anchor after the <td> tag;
1894: # necessary for valid HTML (which Mozilla requires)
1895: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1896: $displayedJumpMarker = 1;
1897: }
1898: $result .= $colHTML . "\n";
1899: }
1900: $result .= " </tr>\n";
1901: $args->{'isNewBranch'} = 0;
1902: }
1903:
1904: if ($r && $rownum % 20 == 0) {
1905: $r->print($result);
1906: $result = "";
1907: $r->rflush();
1908: }
1909: } continue {
1910: if ($r) {
1911: # If we have the connection, make sure the user is still connected
1912: my $c = $r->connection;
1913: if ($c->aborted()) {
1914: # Who cares what we do, nobody will see it anyhow.
1915: return '';
1916: }
1917: }
1918: }
1919:
1920: # Print out the part that jumps to #curloc if it exists
1921: # delay needed because the browser is processing the jump before
1922: # it finishes rendering, so it goes to the wrong place!
1923: # onload might be better, but this routine has no access to that.
1924: # On mozilla, the 0-millisecond timeout seems to prevent this;
1925: # it's quite likely this might fix other browsers, too, and
1926: # certainly won't hurt anything.
1927: if ($displayedJumpMarker) {
1928: $result .= "
1929: <script>
1930: if (location.href.indexOf('#curloc')==-1) {
1931: setTimeout(\"location += '#curloc';\", 0)
1932: }
1933: </script>";
1934: }
1935:
1936: $result .= "</table>";
1937:
1938: if ($r) {
1939: $r->print($result);
1940: $result = "";
1941: $r->rflush();
1942: }
1943:
1944: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1945:
1946: return $result;
1947: }
1948:
1949: sub add_linkitem {
1950: my ($linkitems,$name,$cmd,$text)=@_;
1951: $$linkitems{$name}{'cmd'}=$cmd;
1952: $$linkitems{$name}{'text'}=&mt($text);
1953: }
1954:
1955: sub show_linkitems {
1956: my ($linkitems)=@_;
1957: my @linkorder = ("launchnav","closenav","firsthomework","everything",
1958: "uncompleted","changefolder","clearbubbles");
1959:
1960: my $result .= (<<ENDBLOCK);
1961: <td align="left">
1962: <script type="text/javascript">
1963: function changeNavDisplay () {
1964: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1965: ENDBLOCK
1966: foreach my $link (@linkorder) {
1967: $result.= "if (navchoice == '$link') {".
1968: $linkitems->{$link}{'cmd'}."}\n";
1969: }
1970: $result.='}
1971: </script>
1972: <form name="linkitems" method="post">
1973: <nobr><select name="toplink">'."\n";
1974: foreach my $link (@linkorder) {
1975: if (defined($linkitems->{$link})) {
1976: if ($linkitems->{$link}{'text'} ne '') {
1977: $result .= ' <option value="'.$link.'">'.
1978: $linkitems->{$link}{'text'}."</option>\n";
1979: }
1980: }
1981: }
1982: $result .= '</select> <input type="button" name="chgnav"
1983: value="Go" onClick="javascript:changeNavDisplay()" />
1984: </nobr></form></td>'."\n";
1985:
1986: return $result;
1987: }
1988:
1989: 1;
1990:
1991: package Apache::lonnavmaps::navmap;
1992:
1993: =pod
1994:
1995: =head1 Object: Apache::lonnavmaps::navmap
1996:
1997: =head2 Overview
1998:
1999: The navmap object's job is to provide access to the resources
2000: in the course as Apache::lonnavmaps::resource objects, and to
2001: query and manage the relationship between those resource objects.
2002:
2003: Generally, you'll use the navmap object in one of three basic ways.
2004: In order of increasing complexity and power:
2005:
2006: =over 4
2007:
2008: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2009: various ways to obtain resource objects, based on various identifiers.
2010: Use this when you want to request information about one object or
2011: a handful of resources you already know the identities of, from some
2012: other source. For more about Ids, Symbs, and MapPcs, see the
2013: Resource documentation. Note that Url should be a B<last resort>,
2014: not your first choice; it only works when there is only one
2015: instance of the resource in the course, which only applies to
2016: maps, and even that may change in the future.
2017:
2018: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2019: retrieves resources matching some criterion and returns them
2020: in a flat array, with no structure information. Use this when
2021: you are manipulating a series of resources, based on what map
2022: the are in, but do not care about branching, or exactly how
2023: the maps and resources are related. This is the most common case.
2024:
2025: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2026: the course's navmap in various ways without writing the traversal
2027: code yourself. See iterator documentation below. Use this when
2028: you need to know absolutely everything about the course, including
2029: branches and the precise relationship between maps and resources.
2030:
2031: =back
2032:
2033: =head2 Creation And Destruction
2034:
2035: To create a navmap object, use the following function:
2036:
2037: =over 4
2038:
2039: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2040:
2041: Creates a new navmap object. Returns the navmap object if this is
2042: successful, or B<undef> if not.
2043:
2044: =back
2045:
2046: When you are done with the $navmap object, you I<must> call
2047: $navmap->untieHashes(), or you'll prevent the current user from using that
2048: course until the web server is restarted. (!)
2049:
2050: =head2 Methods
2051:
2052: =over 4
2053:
2054: =item * B<getIterator>(first, finish, filter, condition):
2055:
2056: See iterator documentation below.
2057:
2058: =cut
2059:
2060: use strict;
2061: use GDBM_File;
2062:
2063: sub new {
2064: # magic invocation to create a class instance
2065: my $proto = shift;
2066: my $class = ref($proto) || $proto;
2067: my $self = {};
2068:
2069: # Resource cache stores navmap resources as we reference them. We generate
2070: # them on-demand so we don't pay for creating resources unless we use them.
2071: $self->{RESOURCE_CACHE} = {};
2072:
2073: # Network failure flag, if we accessed the course or user opt and
2074: # failed
2075: $self->{NETWORK_FAILURE} = 0;
2076:
2077: # tie the nav hash
2078:
2079: my %navmaphash;
2080: my %parmhash;
2081: my $courseFn = $ENV{"request.course.fn"};
2082: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2083: &GDBM_READER(), 0640))) {
2084: return undef;
2085: }
2086:
2087: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2088: &GDBM_READER(), 0640)))
2089: {
2090: untie %{$self->{PARM_HASH}};
2091: return undef;
2092: }
2093:
2094: $self->{NAV_HASH} = \%navmaphash;
2095: $self->{PARM_HASH} = \%parmhash;
2096: $self->{PARM_CACHE} = {};
2097:
2098: bless($self);
2099:
2100: return $self;
2101: }
2102:
2103: sub generate_course_user_opt {
2104: my $self = shift;
2105: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2106:
2107: my $uname=$ENV{'user.name'};
2108: my $udom=$ENV{'user.domain'};
2109: my $uhome=$ENV{'user.home'};
2110: my $cid=$ENV{'request.course.id'};
2111: my $chome=$ENV{'course.'.$cid.'.home'};
2112: my ($cdom,$cnum)=split(/\_/,$cid);
2113:
2114: my $userprefix=$uname.'_'.$udom.'_';
2115:
2116: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
2117: unless ($uhome eq 'no_host') {
2118: # ------------------------------------------------- Get coursedata (if present)
2119: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
2120: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
2121: ':resourcedata',$chome);
2122: # Check for network failure
2123: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
2124: $self->{NETWORK_FAILURE} = 1;
2125: } elsif ($reply!~/^error\:/) {
2126: $courserdatas{$cid}=$reply;
2127: $courserdatas{$cid.'.last_cache'}=time;
2128: }
2129: }
2130: foreach (split(/\&/,$courserdatas{$cid})) {
2131: my ($name,$value)=split(/\=/,$_);
2132: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
2133: &Apache::lonnet::unescape($value);
2134: }
2135: # --------------------------------------------------- Get userdata (if present)
2136: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
2137: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
2138: if ($reply!~/^error\:/) {
2139: $userrdatas{$uname.'___'.$udom}=$reply;
2140: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
2141: }
2142: # check to see if network failed
2143: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
2144: {
2145: $self->{NETWORK_FAILURE} = 1;
2146: }
2147: }
2148: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
2149: my ($name,$value)=split(/\=/,$_);
2150: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
2151: &Apache::lonnet::unescape($value);
2152: }
2153: $self->{COURSE_OPT} = \%courseopt;
2154: $self->{USER_OPT} = \%useropt;
2155: }
2156:
2157: $self->{COURSE_USER_OPT_GENERATED} = 1;
2158:
2159: return;
2160: }
2161:
2162: sub generate_email_discuss_status {
2163: my $self = shift;
2164: my $symb = shift;
2165: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2166:
2167: my $cid=$ENV{'request.course.id'};
2168: my ($cdom,$cnum)=split(/\_/,$cid);
2169:
2170: my %emailstatus = &Apache::lonnet::dump('email_status');
2171: my $logoutTime = $emailstatus{'logout'};
2172: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
2173: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2174: $courseLeaveTime : $logoutTime);
2175: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2176: $cdom, $cnum);
2177: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2178: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
2179: my %lastreadtime = ();
2180: foreach (keys %lastread) {
2181: my $key = $_;
2182: $key =~ s/_lastread$//;
2183: $lastreadtime{$key} = $lastread{$_};
2184: }
2185:
2186: my %feedback=();
2187: my %error=();
2188: my $keys = &Apache::lonnet::reply('keys:'.
2189: $ENV{'user.domain'}.':'.
2190: $ENV{'user.name'}.':nohist_email',
2191: $ENV{'user.home'});
2192:
2193: foreach my $msgid (split(/\&/, $keys)) {
2194: $msgid=&Apache::lonnet::unescape($msgid);
2195: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2196: my $plain=
2197: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2198: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2199: my ($what,$url)=($1,$2);
2200: if ($what eq 'Error') {
2201: $error{$url}.=','.$msgid;
2202: } else {
2203: $feedback{$url}.=','.$msgid;
2204: }
2205: }
2206: }
2207: }
2208:
2209: #url's of resources that have feedbacks
2210: $self->{FEEDBACK} = \%feedback;
2211: #or errors
2212: $self->{ERROR_MSG} = \%error;
2213: $self->{DISCUSSION_TIME} = \%discussiontime;
2214: $self->{EMAIL_STATUS} = \%emailstatus;
2215: $self->{LAST_READ} = \%lastreadtime;
2216:
2217: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2218: }
2219:
2220: sub get_user_data {
2221: my $self = shift;
2222: if ($self->{RETRIEVED_USER_DATA}) { return; }
2223:
2224: # Retrieve performance data on problems
2225: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
2226: $ENV{'user.domain'},
2227: $ENV{'user.name'});
2228: $self->{STUDENT_DATA} = \%student_data;
2229:
2230: $self->{RETRIEVED_USER_DATA} = 1;
2231: }
2232:
2233: # Internal function: Takes a key to look up in the nav hash and implements internal
2234: # memory caching of that key.
2235: sub navhash {
2236: my $self = shift; my $key = shift;
2237: return $self->{NAV_HASH}->{$key};
2238: }
2239:
2240: =pod
2241:
2242: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2243: false otherwise. Undefined course maps indicate an error somewhere in
2244: LON-CAPA, and you will not be able to proceed with using the navmap.
2245: See the B<NAV> screen for an example of using this.
2246:
2247: =cut
2248:
2249: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2250: sub courseMapDefined {
2251: my $self = shift;
2252: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
2253:
2254: my $firstres = $self->navhash("map_start_$uri");
2255: my $lastres = $self->navhash("map_finish_$uri");
2256: return $firstres && $lastres;
2257: }
2258:
2259: sub getIterator {
2260: my $self = shift;
2261: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2262: shift, undef, shift);
2263: return $iterator;
2264: }
2265:
2266: # unties the hash when done
2267: sub untieHashes {
2268: my $self = shift;
2269: untie %{$self->{NAV_HASH}};
2270: untie %{$self->{PARM_HASH}};
2271: }
2272:
2273: # Private method: Does the given resource (as a symb string) have
2274: # current discussion? Returns 0 if chat/mail data not extracted.
2275: sub hasDiscussion {
2276: my $self = shift;
2277: my $symb = shift;
2278:
2279: $self->generate_email_discuss_status();
2280:
2281: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2282:
2283: #return defined($self->{DISCUSSION_TIME}->{$symb});
2284:
2285: # backward compatibility (bulletin boards used to be 'wrapped')
2286: my $ressymb = $symb;
2287: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
2288: unless ($ressymb =~ m|adm/wrapper/adm|) {
2289: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
2290: }
2291: }
2292:
2293: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2294: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2295: } else {
2296: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2297: 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).
2298: }
2299: }
2300:
2301: # Private method: Does the given resource (as a symb string) have
2302: # current feedback? Returns the string in the feedback hash, which
2303: # will be false if it does not exist.
2304: sub getFeedback {
2305: my $self = shift;
2306: my $symb = shift;
2307:
2308: $self->generate_email_discuss_status();
2309:
2310: if (!defined($self->{FEEDBACK})) { return ""; }
2311:
2312: return $self->{FEEDBACK}->{$symb};
2313: }
2314:
2315: # Private method: Get the errors for that resource (by source).
2316: sub getErrors {
2317: my $self = shift;
2318: my $src = shift;
2319:
2320: $self->generate_email_discuss_status();
2321:
2322: if (!defined($self->{ERROR_MSG})) { return ""; }
2323: return $self->{ERROR_MSG}->{$src};
2324: }
2325:
2326: =pod
2327:
2328: =item * B<getById>(id):
2329:
2330: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2331: object for that resource. This method, or other methods that use it
2332: (as in the resource object) is the only proper way to obtain a
2333: resource object.
2334:
2335: =item * B<getBySymb>(symb):
2336:
2337: Based on the symb of the resource, get a resource object for that
2338: resource. This is one of the proper ways to get a resource object.
2339:
2340: =item * B<getMapByMapPc>(map_pc):
2341:
2342: Based on the map_pc of the resource, get a resource object for
2343: the given map. This is one of the proper ways to get a resource object.
2344:
2345: =cut
2346:
2347: # The strategy here is to cache the resource objects, and only construct them
2348: # as we use them. The real point is to prevent reading any more from the tied
2349: # hash then we have to, which should hopefully alleviate speed problems.
2350:
2351: sub getById {
2352: my $self = shift;
2353: my $id = shift;
2354:
2355: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2356: {
2357: return $self->{RESOURCE_CACHE}->{$id};
2358: }
2359:
2360: # resource handles inserting itself into cache.
2361: # Not clear why the quotes are necessary, but as of this
2362: # writing it doesn't work without them.
2363: return "Apache::lonnavmaps::resource"->new($self, $id);
2364: }
2365:
2366: sub getBySymb {
2367: my $self = shift;
2368: my $symb = shift;
2369:
2370: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2371: my $map = $self->getResourceByUrl($mapUrl);
2372: my $returnvalue = undef;
2373: if (ref($map)) {
2374: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2375: }
2376: return $returnvalue;
2377: }
2378:
2379: sub getByMapPc {
2380: my $self = shift;
2381: my $map_pc = shift;
2382: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2383: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2384: return $self->getById($map_id);
2385: }
2386:
2387: =pod
2388:
2389: =item * B<firstResource>():
2390:
2391: Returns a resource object reference corresponding to the first
2392: resource in the navmap.
2393:
2394: =cut
2395:
2396: sub firstResource {
2397: my $self = shift;
2398: my $firstResource = $self->navhash('map_start_' .
2399: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2400: return $self->getById($firstResource);
2401: }
2402:
2403: =pod
2404:
2405: =item * B<finishResource>():
2406:
2407: Returns a resource object reference corresponding to the last resource
2408: in the navmap.
2409:
2410: =cut
2411:
2412: sub finishResource {
2413: my $self = shift;
2414: my $firstResource = $self->navhash('map_finish_' .
2415: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2416: return $self->getById($firstResource);
2417: }
2418:
2419: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2420: # the actual lookup; parmval caches the results.
2421: sub parmval {
2422: my $self = shift;
2423: my ($what,$symb)=@_;
2424: my $hashkey = $what."|||".$symb;
2425:
2426: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2427: return $self->{PARM_CACHE}->{$hashkey};
2428: }
2429:
2430: my $result = $self->parmval_real($what, $symb);
2431: $self->{PARM_CACHE}->{$hashkey} = $result;
2432: return $result;
2433: }
2434:
2435: sub parmval_real {
2436: my $self = shift;
2437: my ($what,$symb,$recurse) = @_;
2438:
2439: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2440: $self->generate_course_user_opt();
2441:
2442: my $cid=$ENV{'request.course.id'};
2443: my $csec=$ENV{'request.course.sec'};
2444: my $uname=$ENV{'user.name'};
2445: my $udom=$ENV{'user.domain'};
2446:
2447: unless ($symb) { return ''; }
2448: my $result='';
2449:
2450: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2451:
2452: # ----------------------------------------------------- Cascading lookup scheme
2453: my $rwhat=$what;
2454: $what=~s/^parameter\_//;
2455: $what=~s/\_/\./;
2456:
2457: my $symbparm=$symb.'.'.$what;
2458: my $mapparm=$mapname.'___(all).'.$what;
2459: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2460:
2461: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2462: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2463: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2464:
2465: my $courselevel= $usercourseprefix.'.'.$what;
2466: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2467: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2468:
2469: my $useropt = $self->{USER_OPT};
2470: my $courseopt = $self->{COURSE_OPT};
2471: my $parmhash = $self->{PARM_HASH};
2472:
2473: # ---------------------------------------------------------- first, check user
2474: if ($uname and defined($useropt)) {
2475: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2476: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2477: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2478: }
2479:
2480: # ------------------------------------------------------- second, check course
2481: if ($csec and defined($courseopt)) {
2482: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2483: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2484: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2485: }
2486:
2487: if (defined($courseopt)) {
2488: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2489: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2490: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2491: }
2492:
2493: # ----------------------------------------------------- third, check map parms
2494:
2495: my $thisparm=$$parmhash{$symbparm};
2496: if (defined($thisparm)) { return $thisparm; }
2497:
2498: # ----------------------------------------------------- fourth , check default
2499:
2500: my $meta_rwhat=$rwhat;
2501: $meta_rwhat=~s/\./_/g;
2502: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2503: if (defined($default)) { return $default}
2504: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2505: if (defined($default)) { return $default}
2506:
2507: # --------------------------------------------------- fifth , cascade up parts
2508:
2509: my ($space,@qualifier)=split(/\./,$rwhat);
2510: my $qualifier=join('.',@qualifier);
2511: unless ($space eq '0') {
2512: my @parts=split(/_/,$space);
2513: my $id=pop(@parts);
2514: my $part=join('_',@parts);
2515: if ($part eq '') { $part='0'; }
2516: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2517: if (defined($partgeneral)) { return $partgeneral; }
2518: }
2519: if ($recurse) { return undef; }
2520: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2521: if (defined($pack_def)) { return $pack_def; }
2522: return '';
2523: }
2524:
2525: =pod
2526:
2527: =item * B<getResourceByUrl>(url):
2528:
2529: Retrieves a resource object by URL of the resource. If passed a
2530: resource object, it will simply return it, so it is safe to use this
2531: method in code like "$res = $navmap->getResourceByUrl($res)", if
2532: you're not sure if $res is already an object, or just a URL. If the
2533: resource appears multiple times in the course, only the first instance
2534: will be returned. As a result, this is probably useful only for maps.
2535:
2536: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2537:
2538: The map is a specification of a map to retreive the resources from,
2539: either as a url or as an object. The filterFunc is a reference to a
2540: function that takes a resource object as its one argument and returns
2541: true if the resource should be included, or false if it should not
2542: be. If recursive is true, the map will be recursively examined,
2543: otherwise it will not be. If bailout is true, the function will return
2544: as soon as it finds a resource, if false it will finish. By default,
2545: the map is the top-level map of the course, filterFunc is a function
2546: that always returns 1, recursive is true, bailout is false. The
2547: resources will be returned in a list containing the resource objects
2548: for the corresponding resources, with B<no structure information> in
2549: the list; regardless of branching, recursion, etc., it will be a flat
2550: list.
2551:
2552: Thus, this is suitable for cases where you don't want the structure,
2553: just a list of all resources. It is also suitable for finding out how
2554: many resources match a given description; for this use, if all you
2555: want to know is if I<any> resources match the description, the bailout
2556: parameter will allow you to avoid potentially expensive enumeration of
2557: all matching resources.
2558:
2559: =item * B<hasResource>(map, filterFunc, recursive):
2560:
2561: Convience method for
2562:
2563: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2564:
2565: which will tell whether the map has resources matching the description
2566: in the filter function.
2567:
2568: =cut
2569:
2570:
2571: sub getResourceByUrl {
2572: my $self = shift;
2573: my $resUrl = shift;
2574:
2575: if (ref($resUrl)) { return $resUrl; }
2576:
2577: $resUrl = &Apache::lonnet::clutter($resUrl);
2578: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2579: if ($resId =~ /,/) {
2580: $resId = (split (/,/, $resId))[0];
2581: }
2582: if (!$resId) { return ''; }
2583: return $self->getById($resId);
2584: }
2585:
2586: sub retrieveResources {
2587: my $self = shift;
2588: my $map = shift;
2589: my $filterFunc = shift;
2590: if (!defined ($filterFunc)) {
2591: $filterFunc = sub {return 1;};
2592: }
2593: my $recursive = shift;
2594: if (!defined($recursive)) { $recursive = 1; }
2595: my $bailout = shift;
2596: if (!defined($bailout)) { $bailout = 0; }
2597:
2598: # Create the necessary iterator.
2599: if (!ref($map)) { # assume it's a url of a map.
2600: $map = $self->getResourceByUrl($map);
2601: }
2602:
2603: # If nothing was passed, assume top-level map
2604: if (!$map) {
2605: $map = $self->getById('0.0');
2606: }
2607:
2608: # Check the map's validity.
2609: if (!$map->is_map()) {
2610: # Oh, to throw an exception.... how I'd love that!
2611: return ();
2612: }
2613:
2614: # Get an iterator.
2615: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2616: undef, $recursive);
2617:
2618: my @resources = ();
2619:
2620: # Run down the iterator and collect the resources.
2621: my $curRes;
2622:
2623: while ($curRes = $it->next()) {
2624: if (ref($curRes)) {
2625: if (!&$filterFunc($curRes)) {
2626: next;
2627: }
2628:
2629: push @resources, $curRes;
2630:
2631: if ($bailout) {
2632: return @resources;
2633: }
2634: }
2635:
2636: }
2637:
2638: return @resources;
2639: }
2640:
2641: sub hasResource {
2642: my $self = shift;
2643: my $map = shift;
2644: my $filterFunc = shift;
2645: my $recursive = shift;
2646:
2647: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2648: }
2649:
2650: 1;
2651:
2652: package Apache::lonnavmaps::iterator;
2653:
2654: =pod
2655:
2656: =back
2657:
2658: =head1 Object: navmap Iterator
2659:
2660: An I<iterator> encapsulates the logic required to traverse a data
2661: structure. navmap uses an iterator to traverse the course map
2662: according to the criteria you wish to use.
2663:
2664: To obtain an iterator, call the B<getIterator>() function of a
2665: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2666: directly.) This will return a reference to the iterator:
2667:
2668: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2669:
2670: To get the next thing from the iterator, call B<next>:
2671:
2672: C<my $nextThing = $resourceIterator-E<gt>next()>
2673:
2674: getIterator behaves as follows:
2675:
2676: =over 4
2677:
2678: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2679:
2680: All parameters are optional. firstResource is a resource reference
2681: corresponding to where the iterator should start. It defaults to
2682: navmap->firstResource() for the corresponding nav map. finishResource
2683: corresponds to where you want the iterator to end, defaulting to
2684: navmap->finishResource(). filterHash is a hash used as a set
2685: containing strings representing the resource IDs, defaulting to
2686: empty. Condition is a 1 or 0 that sets what to do with the filter
2687: hash: If a 0, then only resources that exist IN the filterHash will be
2688: recursed on. If it is a 1, only resources NOT in the filterHash will
2689: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2690: false (default), the iterator will only return the first level of map
2691: that is not just a single, 'redirecting' map. If true, the iterator
2692: will return all information, starting with the top-level map,
2693: regardless of content. returnTopMap, if true (default false), will
2694: cause the iterator to return the top-level map object (resource 0.0)
2695: before anything else.
2696:
2697: Thus, by default, only top-level resources will be shown. Change the
2698: condition to a 1 without changing the hash, and all resources will be
2699: shown. Changing the condition to 1 and including some values in the
2700: hash will allow you to selectively suppress parts of the navmap, while
2701: leaving it on 0 and adding things to the hash will allow you to
2702: selectively add parts of the nav map. See the handler code for
2703: examples.
2704:
2705: The iterator will return either a reference to a resource object, or a
2706: token representing something in the map, such as the beginning of a
2707: new branch. The possible tokens are:
2708:
2709: =over 4
2710:
2711: =item * B<END_ITERATOR>:
2712:
2713: The iterator has returned all that it's going to. Further calls to the
2714: iterator will just produce more of these. This is a "false" value, and
2715: is the only false value the iterator which will be returned, so it can
2716: be used as a loop sentinel.
2717:
2718: =item * B<BEGIN_MAP>:
2719:
2720: A new map is being recursed into. This is returned I<after> the map
2721: resource itself is returned.
2722:
2723: =item * B<END_MAP>:
2724:
2725: The map is now done.
2726:
2727: =item * B<BEGIN_BRANCH>:
2728:
2729: A branch is now starting. The next resource returned will be the first
2730: in that branch.
2731:
2732: =item * B<END_BRANCH>:
2733:
2734: The branch is now done.
2735:
2736: =back
2737:
2738: The tokens are retreivable via methods on the iterator object, i.e.,
2739: $iterator->END_MAP.
2740:
2741: Maps can contain empty resources. The iterator will automatically skip
2742: over such resources, but will still treat the structure
2743: correctly. Thus, a complicated map with several branches, but
2744: consisting entirely of empty resources except for one beginning or
2745: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2746: but only one resource will be returned.
2747:
2748: =back
2749:
2750: =head2 Normal Usage
2751:
2752: Normal usage of the iterator object is to do the following:
2753:
2754: my $it = $navmap->getIterator([your params here]);
2755: my $curRes;
2756: while ($curRes = $it->next()) {
2757: [your logic here]
2758: }
2759:
2760: Note that inside of the loop, it's frequently useful to check if
2761: "$curRes" is a reference or not with the reference function; only
2762: resource objects will be references, and any non-references will
2763: be the tokens described above.
2764:
2765: Also note there is some old code floating around that trys to track
2766: the depth of the iterator to see when it's done; do not copy that
2767: code. It is difficult to get right and harder to understand then
2768: this. They should be migrated to this new style.
2769:
2770: =cut
2771:
2772: # Here are the tokens for the iterator:
2773:
2774: sub END_ITERATOR { return 0; }
2775: sub BEGIN_MAP { return 1; } # begining of a new map
2776: sub END_MAP { return 2; } # end of the map
2777: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2778: sub END_BRANCH { return 4; } # end of a branch
2779: sub FORWARD { return 1; } # go forward
2780: sub BACKWARD { return 2; }
2781:
2782: sub min {
2783: (my $a, my $b) = @_;
2784: if ($a < $b) { return $a; } else { return $b; }
2785: }
2786:
2787: sub new {
2788: # magic invocation to create a class instance
2789: my $proto = shift;
2790: my $class = ref($proto) || $proto;
2791: my $self = {};
2792:
2793: $self->{NAV_MAP} = shift;
2794: return undef unless ($self->{NAV_MAP});
2795:
2796: # Handle the parameters
2797: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2798: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2799:
2800: # If the given resources are just the ID of the resource, get the
2801: # objects
2802: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2803: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2804: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2805: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2806:
2807: $self->{FILTER} = shift;
2808:
2809: # A hash, used as a set, of resource already seen
2810: $self->{ALREADY_SEEN} = shift;
2811: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2812: $self->{CONDITION} = shift;
2813:
2814: # Do we want to automatically follow "redirection" maps?
2815: $self->{FORCE_TOP} = shift;
2816:
2817: # Do we want to return the top-level map object (resource 0.0)?
2818: $self->{RETURN_0} = shift;
2819: # have we done that yet?
2820: $self->{HAVE_RETURNED_0} = 0;
2821:
2822: # Now, we need to pre-process the map, by walking forward and backward
2823: # over the parts of the map we're going to look at.
2824:
2825: # The processing steps are exactly the same, except for a few small
2826: # changes, so I bundle those up in the following list of two elements:
2827: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2828: # first_resource).
2829: # This prevents writing nearly-identical code twice.
2830: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2831: 'FIRST_RESOURCE'],
2832: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2833: 'FINISH_RESOURCE'] );
2834:
2835: my $maxDepth = 0; # tracks max depth
2836:
2837: # If there is only one resource in this map, and it's a map, we
2838: # want to remember that, so the user can ask for the first map
2839: # that isn't just a redirector.
2840: my $resource; my $resourceCount = 0;
2841:
2842: # Documentation on this algorithm can be found in the CVS repository at
2843: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2844: # in that file.
2845: # **1**
2846:
2847: foreach my $pass (@iterations) {
2848: my $direction = $pass->[0];
2849: my $valName = $pass->[1];
2850: my $nextResourceMethod = $pass->[2];
2851: my $firstResourceName = $pass->[3];
2852:
2853: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2854: $self->{FIRST_RESOURCE},
2855: $self->{FINISH_RESOURCE},
2856: {}, undef, 0, $direction);
2857:
2858: # prime the recursion
2859: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2860: $iterator->next();
2861: my $curRes = $iterator->next();
2862: my $depth = 1;
2863: while ($depth > 0) {
2864: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2865: if ($curRes == $iterator->END_MAP()) { $depth--; }
2866:
2867: if (ref($curRes)) {
2868: # If there's only one resource, this will save it
2869: # we have to filter empty resources from consideration here,
2870: # or even "empty", redirecting maps have two (start & finish)
2871: # or three (start, finish, plus redirector)
2872: if($direction == FORWARD && $curRes->src()) {
2873: $resource = $curRes; $resourceCount++;
2874: }
2875: my $resultingVal = $curRes->{DATA}->{$valName};
2876: my $nextResources = $curRes->$nextResourceMethod();
2877: my $nextCount = scalar(@{$nextResources});
2878:
2879: if ($nextCount == 1) { # **3**
2880: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2881: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2882: }
2883:
2884: if ($nextCount > 1) { # **4**
2885: foreach my $res (@{$nextResources}) {
2886: my $current = $res->{DATA}->{$valName} || 999999999;
2887: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2888: }
2889: }
2890: }
2891:
2892: # Assign the final val (**2**)
2893: if (ref($curRes) && $direction == BACKWARD()) {
2894: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2895: $curRes->{DATA}->{BOT_UP_VAL});
2896:
2897: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2898: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2899: }
2900:
2901: $curRes = $iterator->next();
2902: }
2903: }
2904:
2905: # Check: Was this only one resource, a map?
2906: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2907: my $firstResource = $resource->map_start();
2908: my $finishResource = $resource->map_finish();
2909: return
2910: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2911: $finishResource, $self->{FILTER},
2912: $self->{ALREADY_SEEN},
2913: $self->{CONDITION}, 0);
2914:
2915: }
2916:
2917: # Set up some bookkeeping information.
2918: $self->{CURRENT_DEPTH} = 0;
2919: $self->{MAX_DEPTH} = $maxDepth;
2920: $self->{STACK} = [];
2921: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2922: $self->{FINISHED} = 0; # When true, the iterator has finished
2923:
2924: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2925: push @{$self->{STACK}}, [];
2926: }
2927:
2928: # Prime the recursion w/ the first resource **5**
2929: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2930: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2931:
2932: bless ($self);
2933:
2934: return $self;
2935: }
2936:
2937: sub next {
2938: my $self = shift;
2939: my $closeAllPages=shift;
2940: if ($self->{FINISHED}) {
2941: return END_ITERATOR();
2942: }
2943:
2944: # If we want to return the top-level map object, and haven't yet,
2945: # do so.
2946: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2947: $self->{HAVE_RETURNED_0} = 1;
2948: return $self->{NAV_MAP}->getById('0.0');
2949: }
2950:
2951: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2952: # grab the next from the recursive iterator
2953: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2954:
2955: # is it a begin or end map? If so, update the depth
2956: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2957: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2958:
2959: # Are we back at depth 0? If so, stop recursing
2960: if ($self->{RECURSIVE_DEPTH} == 0) {
2961: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2962: }
2963:
2964: return $next;
2965: }
2966:
2967: if (defined($self->{FORCE_NEXT})) {
2968: my $tmp = $self->{FORCE_NEXT};
2969: $self->{FORCE_NEXT} = undef;
2970: return $tmp;
2971: }
2972:
2973: # Have we not yet begun? If not, return BEGIN_MAP and
2974: # remember we've started.
2975: if ( !$self->{STARTED} ) {
2976: $self->{STARTED} = 1;
2977: return $self->BEGIN_MAP();
2978: }
2979:
2980: # Here's the guts of the iterator.
2981:
2982: # Find the next resource, if any.
2983: my $found = 0;
2984: my $i = $self->{MAX_DEPTH};
2985: my $newDepth;
2986: my $here;
2987: while ( $i >= 0 && !$found ) {
2988: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2989: $here = pop @{$self->{STACK}->[$i]}; # **7**
2990: $found = 1;
2991: $newDepth = $i;
2992: }
2993: $i--;
2994: }
2995:
2996: # If we still didn't find anything, we're done.
2997: if ( !$found ) {
2998: # We need to get back down to the correct branch depth
2999: if ( $self->{CURRENT_DEPTH} > 0 ) {
3000: $self->{CURRENT_DEPTH}--;
3001: return END_BRANCH();
3002: } else {
3003: $self->{FINISHED} = 1;
3004: return END_MAP();
3005: }
3006: }
3007:
3008: # If this is not a resource, it must be an END_BRANCH marker we want
3009: # to return directly.
3010: if (!ref($here)) { # **8**
3011: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3012: $self->{CURRENT_DEPTH}--;
3013: return $here;
3014: }
3015: }
3016:
3017: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3018: $self->{HERE} = $here;
3019:
3020: # Get to the right level
3021: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3022: push @{$self->{STACK}->[$newDepth]}, $here;
3023: $self->{CURRENT_DEPTH}--;
3024: return END_BRANCH();
3025: }
3026: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3027: push @{$self->{STACK}->[$newDepth]}, $here;
3028: $self->{CURRENT_DEPTH}++;
3029: return BEGIN_BRANCH();
3030: }
3031:
3032: # If we made it here, we have the next resource, and we're at the
3033: # right branch level. So let's examine the resource for where
3034: # we can get to from here.
3035:
3036: # So we need to look at all the resources we can get to from here,
3037: # categorize them if we haven't seen them, remember if we have a new
3038: my $nextUnfiltered = $here->getNext();
3039: my $maxDepthAdded = -1;
3040:
3041: for (@$nextUnfiltered) {
3042: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3043: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3044: push @{$self->{STACK}->[$depth]}, $_;
3045: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3046: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3047: }
3048: }
3049:
3050: # Is this the end of a branch? If so, all of the resources examined above
3051: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3052: # marker onto the stack so we don't forget.
3053: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3054: # BC branch and gets to C, it will see F as the only next resource, but it's
3055: # one level lower. Thus, this is the end of the branch, since there are no
3056: # more resources added to this level or above.
3057: # We don't do this if the examined resource is the finish resource,
3058: # because the condition given above is true, but the "END_MAP" will
3059: # take care of things and we should already be at depth 0.
3060: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3061: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3062: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3063: }
3064:
3065: # That ends the main iterator logic. Now, do we want to recurse
3066: # down this map (if this resource is a map)?
3067: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3068: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3069: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3070: my $firstResource = $self->{HERE}->map_start();
3071: my $finishResource = $self->{HERE}->map_finish();
3072:
3073: $self->{RECURSIVE_ITERATOR} =
3074: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3075: $finishResource, $self->{FILTER},
3076: $self->{ALREADY_SEEN}, $self->{CONDITION});
3077: }
3078:
3079: # If this is a blank resource, don't actually return it.
3080: # Should you ever find you need it, make sure to add an option to the code
3081: # that you can use; other things depend on this behavior.
3082: my $browsePriv = $self->{HERE}->browsePriv();
3083: if (!$self->{HERE}->src() ||
3084: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3085: return $self->next($closeAllPages);
3086: }
3087:
3088: return $self->{HERE};
3089:
3090: }
3091:
3092: =pod
3093:
3094: The other method available on the iterator is B<getStack>, which
3095: returns an array populated with the current 'stack' of maps, as
3096: references to the resource objects. Example: This is useful when
3097: making the navigation map, as we need to check whether we are under a
3098: page map to see if we need to link directly to the resource, or to the
3099: page. The first elements in the array will correspond to the top of
3100: the stack (most inclusive map).
3101:
3102: =cut
3103:
3104: sub getStack {
3105: my $self=shift;
3106:
3107: my @stack;
3108:
3109: $self->populateStack(\@stack);
3110:
3111: return \@stack;
3112: }
3113:
3114: # Private method: Calls the iterators recursively to populate the stack.
3115: sub populateStack {
3116: my $self=shift;
3117: my $stack = shift;
3118:
3119: push @$stack, $self->{HERE} if ($self->{HERE});
3120:
3121: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3122: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3123: }
3124: }
3125:
3126: 1;
3127:
3128: package Apache::lonnavmaps::DFSiterator;
3129:
3130: # Not documented in the perldoc: This is a simple iterator that just walks
3131: # through the nav map and presents the resources in a depth-first search
3132: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3133: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3134: # useful for pre-processing of some kind, and is in fact used by the main
3135: # iterator that way, but that's about it.
3136: # One could imagine merging this into the init routine of the main iterator,
3137: # but this might as well be left separate, since it is possible some other
3138: # use might be found for it. - Jeremy
3139:
3140: # Unlike the main iterator, this DOES return all resources, even blank ones.
3141: # The main iterator needs them to correctly preprocess the map.
3142:
3143: sub BEGIN_MAP { return 1; } # begining of a new map
3144: sub END_MAP { return 2; } # end of the map
3145: sub FORWARD { return 1; } # go forward
3146: sub BACKWARD { return 2; }
3147:
3148: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3149: # filter hash ref (or undef), already seen hash or undef, condition
3150: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3151: sub new {
3152: # magic invocation to create a class instance
3153: my $proto = shift;
3154: my $class = ref($proto) || $proto;
3155: my $self = {};
3156:
3157: $self->{NAV_MAP} = shift;
3158: return undef unless ($self->{NAV_MAP});
3159:
3160: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3161: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3162:
3163: # If the given resources are just the ID of the resource, get the
3164: # objects
3165: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3166: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3167: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3168: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3169:
3170: $self->{FILTER} = shift;
3171:
3172: # A hash, used as a set, of resource already seen
3173: $self->{ALREADY_SEEN} = shift;
3174: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3175: $self->{CONDITION} = shift;
3176: $self->{DIRECTION} = shift || FORWARD();
3177:
3178: # Flag: Have we started yet?
3179: $self->{STARTED} = 0;
3180:
3181: # Should we continue calling the recursive iterator, if any?
3182: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3183: # The recursive iterator, if any
3184: $self->{RECURSIVE_ITERATOR} = undef;
3185: # Are we recursing on a map, or a branch?
3186: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3187: # And the count of how deep it is, so that this iterator can keep track of
3188: # when to pick back up again.
3189: $self->{RECURSIVE_DEPTH} = 0;
3190:
3191: # For keeping track of our branches, we maintain our own stack
3192: $self->{STACK} = [];
3193:
3194: # Start with the first resource
3195: if ($self->{DIRECTION} == FORWARD) {
3196: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3197: } else {
3198: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3199: }
3200:
3201: bless($self);
3202: return $self;
3203: }
3204:
3205: sub next {
3206: my $self = shift;
3207:
3208: # Are we using a recursive iterator? If so, pull from that and
3209: # watch the depth; we want to resume our level at the correct time.
3210: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3211: # grab the next from the recursive iterator
3212: my $next = $self->{RECURSIVE_ITERATOR}->next();
3213:
3214: # is it a begin or end map? Update depth if so
3215: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3216: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3217:
3218: # Are we back at depth 0? If so, stop recursing.
3219: if ($self->{RECURSIVE_DEPTH} == 0) {
3220: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3221: }
3222:
3223: return $next;
3224: }
3225:
3226: # Is there a current resource to grab? If not, then return
3227: # END_MAP, which will end the iterator.
3228: if (scalar(@{$self->{STACK}}) == 0) {
3229: return $self->END_MAP();
3230: }
3231:
3232: # Have we not yet begun? If not, return BEGIN_MAP and
3233: # remember that we've started.
3234: if ( !$self->{STARTED} ) {
3235: $self->{STARTED} = 1;
3236: return $self->BEGIN_MAP;
3237: }
3238:
3239: # Get the next resource in the branch
3240: $self->{HERE} = pop @{$self->{STACK}};
3241:
3242: # remember that we've seen this, so we don't return it again later
3243: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3244:
3245: # Get the next possible resources
3246: my $nextUnfiltered;
3247: if ($self->{DIRECTION} == FORWARD()) {
3248: $nextUnfiltered = $self->{HERE}->getNext();
3249: } else {
3250: $nextUnfiltered = $self->{HERE}->getPrevious();
3251: }
3252: my $next = [];
3253:
3254: # filter the next possibilities to remove things we've
3255: # already seen.
3256: foreach (@$nextUnfiltered) {
3257: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3258: push @$next, $_;
3259: }
3260: }
3261:
3262: while (@$next) {
3263: # copy the next possibilities over to the stack
3264: push @{$self->{STACK}}, shift @$next;
3265: }
3266:
3267: # If this is a map and we want to recurse down it... (not filtered out)
3268: if ($self->{HERE}->is_map() &&
3269: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3270: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3271: my $firstResource = $self->{HERE}->map_start();
3272: my $finishResource = $self->{HERE}->map_finish();
3273:
3274: $self->{RECURSIVE_ITERATOR} =
3275: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3276: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3277: $self->{CONDITION}, $self->{DIRECTION});
3278: }
3279:
3280: return $self->{HERE};
3281: }
3282:
3283: # Identical to the full iterator methods of the same name. Hate to copy/paste
3284: # but I also hate to "inherit" either iterator from the other.
3285:
3286: sub getStack {
3287: my $self=shift;
3288:
3289: my @stack;
3290:
3291: $self->populateStack(\@stack);
3292:
3293: return \@stack;
3294: }
3295:
3296: # Private method: Calls the iterators recursively to populate the stack.
3297: sub populateStack {
3298: my $self=shift;
3299: my $stack = shift;
3300:
3301: push @$stack, $self->{HERE} if ($self->{HERE});
3302:
3303: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3304: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3305: }
3306: }
3307:
3308: 1;
3309:
3310: package Apache::lonnavmaps::resource;
3311:
3312: use Apache::lonnet;
3313:
3314: =pod
3315:
3316: =head1 Object: resource
3317:
3318: X<resource, navmap object>
3319: A resource object encapsulates a resource in a resource map, allowing
3320: easy manipulation of the resource, querying the properties of the
3321: resource (including user properties), and represents a reference that
3322: can be used as the canonical representation of the resource by
3323: lonnavmap clients like renderers.
3324:
3325: A resource only makes sense in the context of a navmap, as some of the
3326: data is stored in the navmap object.
3327:
3328: You will probably never need to instantiate this object directly. Use
3329: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3330: starting resource.
3331:
3332: Resource objects respect the parameter_hiddenparts, which suppresses
3333: various parts according to the wishes of the map author. As of this
3334: writing, there is no way to override this parameter, and suppressed
3335: parts will never be returned, nor will their response types or ids be
3336: stored.
3337:
3338: =head2 Overview
3339:
3340: A B<Resource> is the most granular type of object in LON-CAPA that can
3341: be included in a course. It can either be a particular resource, like
3342: an HTML page, external resource, problem, etc., or it can be a
3343: container sequence, such as a "page" or a "map".
3344:
3345: To see a sequence from the user's point of view, please see the
3346: B<Creating a Course: Maps and Sequences> chapter of the Author's
3347: Manual.
3348:
3349: A Resource Object, once obtained from a navmap object via a B<getBy*>
3350: method of the navmap, or from an iterator, allows you to query
3351: information about that resource.
3352:
3353: Generally, you do not ever want to create a resource object yourself,
3354: so creation has been left undocumented. Always retrieve resources
3355: from navmap objects.
3356:
3357: =head3 Identifying Resources
3358:
3359: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3360: unique to that resource for a given course. X<resource ID, in big hash>
3361: The Resource ID has the form #.#, where the first number is the same
3362: for every resource in a map, and the second is unique. For instance,
3363: for a course laid out like this:
3364:
3365: * Problem 1
3366: * Map
3367: * Resource 2
3368: * Resource 3
3369:
3370: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3371: C<Resource 3> will share a first number. The second number may end up
3372: re-used between the two groups.
3373:
3374: The resource ID is only used in the big hash, but can be used in the
3375: context of a course to identify a resource easily. (For instance, the
3376: printing system uses it to record which resources from a sequence you
3377: wish to print.)
3378:
3379: X<symb> X<resource, symb>
3380: All resources also have B<symb>s, which uniquely identify a resource
3381: in a course. Many internal LON-CAPA functions expect a symb. A symb
3382: carries along with it the URL of the resource, and the map it appears
3383: in. Symbs are much larger then resource IDs.
3384:
3385: =cut
3386:
3387: sub new {
3388: # magic invocation to create a class instance
3389: my $proto = shift;
3390: my $class = ref($proto) || $proto;
3391: my $self = {};
3392:
3393: $self->{NAV_MAP} = shift;
3394: $self->{ID} = shift;
3395:
3396: # Store this new resource in the parent nav map's cache.
3397: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3398: $self->{RESOURCE_ERROR} = 0;
3399:
3400: # A hash that can be used by two-pass algorithms to store data
3401: # about this resource in. Not used by the resource object
3402: # directly.
3403: $self->{DATA} = {};
3404:
3405: bless($self);
3406:
3407: return $self;
3408: }
3409:
3410: # private function: simplify the NAV_HASH lookups we keep doing
3411: # pass the name, and to automatically append my ID, pass a true val on the
3412: # second param
3413: sub navHash {
3414: my $self = shift;
3415: my $param = shift;
3416: my $id = shift;
3417: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3418: }
3419:
3420: =pod
3421:
3422: =head2 Methods
3423:
3424: Once you have a resource object, here's what you can do with it:
3425:
3426: =head3 Attribute Retrieval
3427:
3428: Every resource has certain attributes that can be retrieved and used:
3429:
3430: =over 4
3431:
3432: =item * B<ID>: Every resource has an ID that is unique for that
3433: resource in the course it is in. The ID is actually in the hash
3434: representing the resource, so for a resource object $res, obtain
3435: it via C<$res->{ID}).
3436:
3437: =item * B<compTitle>:
3438:
3439: Returns a "composite title", that is equal to $res->title() if the
3440: resource has a title, and is otherwise the last part of the URL (e.g.,
3441: "problem.problem").
3442:
3443: =item * B<ext>:
3444:
3445: Returns true if the resource is external.
3446:
3447: =item * B<kind>:
3448:
3449: Returns the kind of the resource from the compiled nav map.
3450:
3451: =item * B<randomout>:
3452:
3453: Returns true if this resource was chosen to NOT be shown to the user
3454: by the random map selection feature. In other words, this is usually
3455: false.
3456:
3457: =item * B<randompick>:
3458:
3459: Returns true for a map if the randompick feature is being used on the
3460: map. (?)
3461:
3462: =item * B<src>:
3463:
3464: Returns the source for the resource.
3465:
3466: =item * B<symb>:
3467:
3468: Returns the symb for the resource.
3469:
3470: =item * B<title>:
3471:
3472: Returns the title of the resource.
3473:
3474: =back
3475:
3476: =cut
3477:
3478: # These info functions can be used directly, as they don't return
3479: # resource information.
3480: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3481: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3482: sub from { my $self=shift; return $self->navHash("from_", 1); }
3483: # considered private and undocumented
3484: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3485: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3486: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3487: sub randompick {
3488: my $self = shift;
3489: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3490: '.0.parameter_randompick'};
3491: }
3492: sub src {
3493: my $self=shift;
3494: return $self->navHash("src_", 1);
3495: }
3496: sub symb {
3497: my $self=shift;
3498: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3499: my $symbSrc = &Apache::lonnet::declutter($self->src());
3500: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3501: . '___' . $second . '___' . $symbSrc;
3502: return &Apache::lonnet::symbclean($symb);
3503: }
3504: sub title {
3505: my $self=shift;
3506: if ($self->{ID} eq '0.0') {
3507: # If this is the top-level map, return the title of the course
3508: # since this map can not be titled otherwise.
3509: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3510: }
3511: return $self->navHash("title_", 1); }
3512: # considered private and undocumented
3513: sub to { my $self=shift; return $self->navHash("to_", 1); }
3514: sub compTitle {
3515: my $self = shift;
3516: my $title = $self->title();
3517: $title=~s/\&colon\;/\:/gs;
3518: if (!$title) {
3519: $title = $self->src();
3520: $title = substr($title, rindex($title, '/') + 1);
3521: }
3522: return $title;
3523: }
3524: =pod
3525:
3526: B<Predicate Testing the Resource>
3527:
3528: These methods are shortcuts to deciding if a given resource has a given property.
3529:
3530: =over 4
3531:
3532: =item * B<is_map>:
3533:
3534: Returns true if the resource is a map type.
3535:
3536: =item * B<is_problem>:
3537:
3538: Returns true if the resource is a problem type, false
3539: otherwise. (Looks at the extension on the src field; might need more
3540: to work correctly.)
3541:
3542: =item * B<is_page>:
3543:
3544: Returns true if the resource is a page.
3545:
3546: =item * B<is_sequence>:
3547:
3548: Returns true if the resource is a sequence.
3549:
3550: =back
3551:
3552: =cut
3553:
3554: sub hasResource {
3555: my $self = shift;
3556: return $self->{NAV_MAP}->hasResource(@_);
3557: }
3558:
3559: sub retrieveResources {
3560: my $self = shift;
3561: return $self->{NAV_MAP}->retrieveResources(@_);
3562: }
3563:
3564: sub is_html {
3565: my $self=shift;
3566: my $src = $self->src();
3567: return ($src =~ /html$/);
3568: }
3569: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3570: sub is_page {
3571: my $self=shift;
3572: my $src = $self->src();
3573: return $self->navHash("is_map_", 1) &&
3574: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3575: }
3576: sub is_problem {
3577: my $self=shift;
3578: my $src = $self->src();
3579: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3580: }
3581: sub contains_problem {
3582: my $self=shift;
3583: if ($self->is_page()) {
3584: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3585: return $hasProblem;
3586: }
3587: return 0;
3588: }
3589: sub is_sequence {
3590: my $self=shift;
3591: my $src = $self->src();
3592: return $self->navHash("is_map_", 1) &&
3593: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3594: }
3595: sub is_survey {
3596: my $self = shift();
3597: my $part = shift();
3598: if ($self->parmval('type',$part) eq 'survey') {
3599: return 1;
3600: }
3601: if ($self->src() =~ /\.(survey)$/) {
3602: return 1;
3603: }
3604: return 0;
3605: }
3606:
3607: sub is_empty_sequence {
3608: my $self=shift;
3609: my $src = $self->src();
3610: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3611: }
3612:
3613: # Private method: Shells out to the parmval in the nav map, handler parts.
3614: sub parmval {
3615: my $self = shift;
3616: my $what = shift;
3617: my $part = shift;
3618: if (!defined($part)) {
3619: $part = '0';
3620: }
3621: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3622: }
3623:
3624: =pod
3625:
3626: B<Map Methods>
3627:
3628: These methods are useful for getting information about the map
3629: properties of the resource, if the resource is a map (B<is_map>).
3630:
3631: =over 4
3632:
3633: =item * B<map_finish>:
3634:
3635: Returns a reference to a resource object corresponding to the finish
3636: resource of the map.
3637:
3638: =item * B<map_pc>:
3639:
3640: Returns the pc value of the map, which is the first number that
3641: appears in the resource ID of the resources in the map, and is the
3642: number that appears around the middle of the symbs of the resources in
3643: that map.
3644:
3645: =item * B<map_start>:
3646:
3647: Returns a reference to a resource object corresponding to the start
3648: resource of the map.
3649:
3650: =item * B<map_type>:
3651:
3652: Returns a string with the type of the map in it.
3653:
3654: =back
3655:
3656: =cut
3657:
3658: sub map_finish {
3659: my $self = shift;
3660: my $src = $self->src();
3661: $src = Apache::lonnet::clutter($src);
3662: my $res = $self->navHash("map_finish_$src", 0);
3663: $res = $self->{NAV_MAP}->getById($res);
3664: return $res;
3665: }
3666: sub map_pc {
3667: my $self = shift;
3668: my $src = $self->src();
3669: return $self->navHash("map_pc_$src", 0);
3670: }
3671: sub map_start {
3672: my $self = shift;
3673: my $src = $self->src();
3674: $src = Apache::lonnet::clutter($src);
3675: my $res = $self->navHash("map_start_$src", 0);
3676: $res = $self->{NAV_MAP}->getById($res);
3677: return $res;
3678: }
3679: sub map_type {
3680: my $self = shift;
3681: my $pc = $self->map_pc();
3682: return $self->navHash("map_type_$pc", 0);
3683: }
3684:
3685: #####
3686: # Property queries
3687: #####
3688:
3689: # These functions will be responsible for returning the CORRECT
3690: # VALUE for the parameter, no matter what. So while they may look
3691: # like direct calls to parmval, they can be more then that.
3692: # So, for instance, the duedate function should use the "duedatetype"
3693: # information, rather then the resource object user.
3694:
3695: =pod
3696:
3697: =head2 Resource Parameters
3698:
3699: In order to use the resource parameters correctly, the nav map must
3700: have been instantiated with genCourseAndUserOptions set to true, so
3701: the courseopt and useropt is read correctly. Then, you can call these
3702: functions to get the relevant parameters for the resource. Each
3703: function defaults to part "0", but can be directed to another part by
3704: passing the part as the parameter.
3705:
3706: These methods are responsible for getting the parameter correct, not
3707: merely reflecting the contents of the GDBM hashes. As we move towards
3708: dates relative to other dates, these methods should be updated to
3709: reflect that. (Then, anybody using these methods will not have to update
3710: their code.)
3711:
3712: =over 4
3713:
3714: =item * B<acc>:
3715:
3716: Get the Client IP/Name Access Control information.
3717:
3718: =item * B<answerdate>:
3719:
3720: Get the answer-reveal date for the problem.
3721:
3722: =item * B<awarded>:
3723:
3724: Gets the awarded value for the problem part. Requires genUserData set to
3725: true when the navmap object was created.
3726:
3727: =item * B<duedate>:
3728:
3729: Get the due date for the problem.
3730:
3731: =item * B<tries>:
3732:
3733: Get the number of tries the student has used on the problem.
3734:
3735: =item * B<maxtries>:
3736:
3737: Get the number of max tries allowed.
3738:
3739: =item * B<opendate>:
3740:
3741: Get the open date for the problem.
3742:
3743: =item * B<sig>:
3744:
3745: Get the significant figures setting.
3746:
3747: =item * B<tol>:
3748:
3749: Get the tolerance for the problem.
3750:
3751: =item * B<tries>:
3752:
3753: Get the number of tries the user has already used on the problem.
3754:
3755: =item * B<type>:
3756:
3757: Get the question type for the problem.
3758:
3759: =item * B<weight>:
3760:
3761: Get the weight for the problem.
3762:
3763: =back
3764:
3765: =cut
3766:
3767: sub acc {
3768: (my $self, my $part) = @_;
3769: return $self->parmval("acc", $part);
3770: }
3771: sub answerdate {
3772: (my $self, my $part) = @_;
3773: # Handle intervals
3774: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3775: return $self->duedate($part) +
3776: $self->parmval("answerdate", $part);
3777: }
3778: return $self->parmval("answerdate", $part);
3779: }
3780: sub awarded {
3781: my $self = shift; my $part = shift;
3782: $self->{NAV_MAP}->get_user_data();
3783: if (!defined($part)) { $part = '0'; }
3784: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3785: }
3786: sub duedate {
3787: (my $self, my $part) = @_;
3788: my $interval=$self->parmval("interval", $part);
3789: if ($interval) {
3790: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3791: if ($first_access) { return ($first_access+$interval); }
3792: }
3793: return $self->parmval("duedate", $part);
3794: }
3795: sub maxtries {
3796: (my $self, my $part) = @_;
3797: return $self->parmval("maxtries", $part);
3798: }
3799: sub opendate {
3800: (my $self, my $part) = @_;
3801: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3802: return $self->duedate($part) -
3803: $self->parmval("opendate", $part);
3804: }
3805: return $self->parmval("opendate");
3806: }
3807: sub problemstatus {
3808: (my $self, my $part) = @_;
3809: return lc $self->parmval("problemstatus", $part);
3810: }
3811: sub sig {
3812: (my $self, my $part) = @_;
3813: return $self->parmval("sig", $part);
3814: }
3815: sub tol {
3816: (my $self, my $part) = @_;
3817: return $self->parmval("tol", $part);
3818: }
3819: sub tries {
3820: my $self = shift;
3821: my $tries = $self->queryRestoreHash('tries', shift);
3822: if (!defined($tries)) { return '0';}
3823: return $tries;
3824: }
3825: sub type {
3826: (my $self, my $part) = @_;
3827: return $self->parmval("type", $part);
3828: }
3829: sub weight {
3830: my $self = shift; my $part = shift;
3831: if (!defined($part)) { $part = '0'; }
3832: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3833: $self->symb(), $ENV{'user.domain'},
3834: $ENV{'user.name'},
3835: $ENV{'request.course.sec'});
3836: }
3837: sub part_display {
3838: my $self= shift(); my $partID = shift();
3839: if (! defined($partID)) { $partID = '0'; }
3840: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3841: $self->symb);
3842: if (! defined($display) || $display eq '') {
3843: $display = $partID;
3844: }
3845: return $display;
3846: }
3847:
3848: # Multiple things need this
3849: sub getReturnHash {
3850: my $self = shift;
3851:
3852: if (!defined($self->{RETURN_HASH})) {
3853: my %tmpHash = &Apache::lonnet::restore($self->symb());
3854: $self->{RETURN_HASH} = \%tmpHash;
3855: }
3856: }
3857:
3858: ######
3859: # Status queries
3860: ######
3861:
3862: # These methods query the status of problems.
3863:
3864: # If we need to count parts, this function determines the number of
3865: # parts from the metadata. When called, it returns a reference to a list
3866: # of strings corresponding to the parts. (Thus, using it in a scalar context
3867: # tells you how many parts you have in the problem:
3868: # $partcount = scalar($resource->countParts());
3869: # Don't use $self->{PARTS} directly because you don't know if it's been
3870: # computed yet.
3871:
3872: =pod
3873:
3874: =head2 Resource misc
3875:
3876: Misc. functions for the resource.
3877:
3878: =over 4
3879:
3880: =item * B<hasDiscussion>:
3881:
3882: Returns a false value if there has been discussion since the user last
3883: logged in, true if there has. Always returns false if the discussion
3884: data was not extracted when the nav map was constructed.
3885:
3886: =item * B<getFeedback>:
3887:
3888: Gets the feedback for the resource and returns the raw feedback string
3889: for the resource, or the null string if there is no feedback or the
3890: email data was not extracted when the nav map was constructed. Usually
3891: used like this:
3892:
3893: for (split(/\,/, $res->getFeedback())) {
3894: my $link = &Apache::lonnet::escape($_);
3895: ...
3896:
3897: and use the link as appropriate.
3898:
3899: =cut
3900:
3901: sub hasDiscussion {
3902: my $self = shift;
3903: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3904: }
3905:
3906: sub getFeedback {
3907: my $self = shift;
3908: my $source = $self->src();
3909: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3910: return $self->{NAV_MAP}->getFeedback($source);
3911: }
3912:
3913: sub getErrors {
3914: my $self = shift;
3915: my $source = $self->src();
3916: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3917: return $self->{NAV_MAP}->getErrors($source);
3918: }
3919:
3920: =pod
3921:
3922: =item * B<parts>():
3923:
3924: Returns a list reference containing sorted strings corresponding to
3925: each part of the problem. Single part problems have only a part '0'.
3926: Multipart problems do not return their part '0', since they typically
3927: do not really matter.
3928:
3929: =item * B<countParts>():
3930:
3931: Returns the number of parts of the problem a student can answer. Thus,
3932: for single part problems, returns 1. For multipart, it returns the
3933: number of parts in the problem, not including psuedo-part 0.
3934:
3935: =item * B<countResponses>():
3936:
3937: Returns the total number of responses in the problem a student can answer.
3938:
3939: =item * B<responseTypes>():
3940:
3941: Returns a hash whose keys are the response types. The values are the number
3942: of times each response type is used. This is for the I<entire> problem, not
3943: just a single part.
3944:
3945: =item * B<multipart>():
3946:
3947: Returns true if the problem is multipart, false otherwise. Use this instead
3948: of countParts if all you want is multipart/not multipart.
3949:
3950: =item * B<responseType>($part):
3951:
3952: Returns the response type of the part, without the word "response" on the
3953: end. Example return values: 'string', 'essay', 'numeric', etc.
3954:
3955: =item * B<responseIds>($part):
3956:
3957: Retreives the response IDs for the given part as an array reference containing
3958: strings naming the response IDs. This may be empty.
3959:
3960: =back
3961:
3962: =cut
3963:
3964: sub parts {
3965: my $self = shift;
3966:
3967: if ($self->ext) { return []; }
3968:
3969: $self->extractParts();
3970: return $self->{PARTS};
3971: }
3972:
3973: sub countParts {
3974: my $self = shift;
3975:
3976: my $parts = $self->parts();
3977:
3978: # If I left this here, then it's not necessary.
3979: #my $delta = 0;
3980: #for my $part (@$parts) {
3981: # if ($part eq '0') { $delta--; }
3982: #}
3983:
3984: if ($self->{RESOURCE_ERROR}) {
3985: return 0;
3986: }
3987:
3988: return scalar(@{$parts}); # + $delta;
3989: }
3990:
3991: sub countResponses {
3992: my $self = shift;
3993: my $count;
3994: foreach my $part (@{$self->parts()}) {
3995: $count+= scalar($self->responseIds($part));
3996: }
3997: return $count;
3998: }
3999:
4000: sub responseTypes {
4001: my $self = shift;
4002: my %responses;
4003: foreach my $part ($self->parts()) {
4004: foreach my $responsetype ($self->responseType($part)) {
4005: $responses{$responsetype}++ if (defined($responsetype));
4006: }
4007: }
4008: return %responses;
4009: }
4010:
4011: sub multipart {
4012: my $self = shift;
4013: return $self->countParts() > 1;
4014: }
4015:
4016: sub singlepart {
4017: my $self = shift;
4018: return $self->countParts() == 1;
4019: }
4020:
4021: sub responseType {
4022: my $self = shift;
4023: my $part = shift;
4024:
4025: $self->extractParts();
4026: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4027: return @{$self->{RESPONSE_TYPES}->{$part}};
4028: } else {
4029: return undef;
4030: }
4031: }
4032:
4033: sub responseIds {
4034: my $self = shift;
4035: my $part = shift;
4036:
4037: $self->extractParts();
4038: if (defined($self->{RESPONSE_IDS}->{$part})) {
4039: return @{$self->{RESPONSE_IDS}->{$part}};
4040: } else {
4041: return undef;
4042: }
4043: }
4044:
4045: # Private function: Extracts the parts information, both part names and
4046: # part types, and saves it.
4047: sub extractParts {
4048: my $self = shift;
4049:
4050: return if (defined($self->{PARTS}));
4051: return if ($self->ext);
4052:
4053: $self->{PARTS} = [];
4054:
4055: my %parts;
4056:
4057: # Retrieve part count, if this is a problem
4058: if ($self->is_problem()) {
4059: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4060: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4061:
4062: if ($partorder) {
4063: my @parts;
4064: for my $part (split (/,/,$partorder)) {
4065: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4066: push @parts, $part;
4067: $parts{$part} = 1;
4068: }
4069: }
4070: $self->{PARTS} = \@parts;
4071: } else {
4072: if (!$metadata) {
4073: $self->{RESOURCE_ERROR} = 1;
4074: $self->{PARTS} = [];
4075: $self->{PART_TYPE} = {};
4076: return;
4077: }
4078: foreach (split(/\,/,$metadata)) {
4079: if ($_ =~ /^part_(.*)$/) {
4080: my $part = $1;
4081: # This floods the logs if it blows up
4082: if (defined($parts{$part})) {
4083: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4084: }
4085:
4086: # check to see if part is turned off.
4087:
4088: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4089: $parts{$part} = 1;
4090: }
4091: }
4092: }
4093: my @sortedParts = sort keys %parts;
4094: $self->{PARTS} = \@sortedParts;
4095: }
4096:
4097:
4098: # These hashes probably do not need names that end with "Hash"....
4099: my %responseIdHash;
4100: my %responseTypeHash;
4101:
4102:
4103: # Init the responseIdHash
4104: foreach (@{$self->{PARTS}}) {
4105: $responseIdHash{$_} = [];
4106: }
4107:
4108: # Now, the unfortunate thing about this is that parts, part name, and
4109: # response id are delimited by underscores, but both the part
4110: # name and response id can themselves have underscores in them.
4111: # So we have to use our knowlege of part names to figure out
4112: # where the part names begin and end, and even then, it is possible
4113: # to construct ambiguous situations.
4114: foreach (split /,/, $metadata) {
4115: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4116: my $responseType = $1;
4117: my $partStuff = $2;
4118: my $partIdSoFar = '';
4119: my @partChunks = split /_/, $partStuff;
4120: my $i = 0;
4121: for ($i = 0; $i < scalar(@partChunks); $i++) {
4122: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4123: $partIdSoFar .= $partChunks[$i];
4124: if ($parts{$partIdSoFar}) {
4125: my @otherChunks = @partChunks[$i+1..$#partChunks];
4126: my $responseId = join('_', @otherChunks);
4127: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4128: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4129: }
4130: }
4131: }
4132: }
4133: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4134: #
4135: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4136: if ($resorder) {
4137: my @resorder=split(/,/,$resorder);
4138: foreach my $part (keys(%responseIdHash)) {
4139: my $i=0;
4140: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4141: my @neworder;
4142: foreach my $possibleid (@resorder) {
4143: if (exists($resids{$possibleid})) {
4144: push(@neworder,$resids{$possibleid});
4145: }
4146: }
4147: my @ids;
4148: my @type;
4149: foreach my $element (@neworder) {
4150: push (@ids,$responseIdHash{$part}->[$element]);
4151: push (@type,$responseTypeHash{$part}->[$element]);
4152: }
4153: $responseIdHash{$part}=\@ids;
4154: $responseTypeHash{$part}=\@type;
4155: }
4156: }
4157: $self->{RESPONSE_IDS} = \%responseIdHash;
4158: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4159: }
4160:
4161: return;
4162: }
4163:
4164: =pod
4165:
4166: =head2 Resource Status
4167:
4168: Problem resources have status information, reflecting their various
4169: dates and completion statuses.
4170:
4171: There are two aspects to the status: the date-related information and
4172: the completion information.
4173:
4174: Idiomatic usage of these two methods would probably look something
4175: like
4176:
4177: foreach ($resource->parts()) {
4178: my $dateStatus = $resource->getDateStatus($_);
4179: my $completionStatus = $resource->getCompletionStatus($_);
4180:
4181: or
4182:
4183: my $status = $resource->status($_);
4184:
4185: ... use it here ...
4186: }
4187:
4188: Which you use depends on exactly what you are looking for. The
4189: status() function has been optimized for the nav maps display and may
4190: not precisely match what you need elsewhere.
4191:
4192: The symbolic constants shown below can be accessed through the
4193: resource object: C<$res->OPEN>.
4194:
4195: =over 4
4196:
4197: =item * B<getDateStatus>($part):
4198:
4199: ($part defaults to 0). A convenience function that returns a symbolic
4200: constant telling you about the date status of the part. The possible
4201: return values are:
4202:
4203: =back
4204:
4205: B<Date Codes>
4206:
4207: =over 4
4208:
4209: =item * B<OPEN_LATER>:
4210:
4211: The problem will be opened later.
4212:
4213: =item * B<OPEN>:
4214:
4215: Open and not yet due.
4216:
4217:
4218: =item * B<PAST_DUE_ANSWER_LATER>:
4219:
4220: The due date has passed, but the answer date has not yet arrived.
4221:
4222: =item * B<PAST_DUE_NO_ANSWER>:
4223:
4224: The due date has passed and there is no answer opening date set.
4225:
4226: =item * B<ANSWER_OPEN>:
4227:
4228: The answer date is here.
4229:
4230: =item * B<NETWORK_FAILURE>:
4231:
4232: The information is unknown due to network failure.
4233:
4234: =back
4235:
4236: =cut
4237:
4238: # Apparently the compiler optimizes these into constants automatically
4239: sub OPEN_LATER { return 0; }
4240: sub OPEN { return 1; }
4241: sub PAST_DUE_NO_ANSWER { return 2; }
4242: sub PAST_DUE_ANSWER_LATER { return 3; }
4243: sub ANSWER_OPEN { return 4; }
4244: sub NOTHING_SET { return 5; }
4245: sub NETWORK_FAILURE { return 100; }
4246:
4247: # getDateStatus gets the date status for a given problem part.
4248: # Because answer date, due date, and open date are fully independent
4249: # (i.e., it is perfectly possible to *only* have an answer date),
4250: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4251: # (past, future, none given). This function handles this with a decision
4252: # tree. Read the comments to follow the decision tree.
4253:
4254: sub getDateStatus {
4255: my $self = shift;
4256: my $part = shift;
4257: $part = "0" if (!defined($part));
4258:
4259: # Always return network failure if there was one.
4260: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4261:
4262: my $now = time();
4263:
4264: my $open = $self->opendate($part);
4265: my $due = $self->duedate($part);
4266: my $answer = $self->answerdate($part);
4267:
4268: if (!$open && !$due && !$answer) {
4269: # no data on the problem at all
4270: # should this be the same as "open later"? think multipart.
4271: return $self->NOTHING_SET;
4272: }
4273: if (!$open || $now < $open) {return $self->OPEN_LATER}
4274: if (!$due || $now < $due) {return $self->OPEN}
4275: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4276: if ($answer) { return $self->ANSWER_OPEN; }
4277: return PAST_DUE_NO_ANSWER;
4278: }
4279:
4280: =pod
4281:
4282: B<>
4283:
4284: =over 4
4285:
4286: =item * B<getCompletionStatus>($part):
4287:
4288: ($part defaults to 0.) A convenience function that returns a symbolic
4289: constant telling you about the completion status of the part, with the
4290: following possible results:
4291:
4292: =back
4293:
4294: B<Completion Codes>
4295:
4296: =over 4
4297:
4298: =item * B<NOT_ATTEMPTED>:
4299:
4300: Has not been attempted at all.
4301:
4302: =item * B<INCORRECT>:
4303:
4304: Attempted, but wrong by student.
4305:
4306: =item * B<INCORRECT_BY_OVERRIDE>:
4307:
4308: Attempted, but wrong by instructor override.
4309:
4310: =item * B<CORRECT>:
4311:
4312: Correct or correct by instructor.
4313:
4314: =item * B<CORRECT_BY_OVERRIDE>:
4315:
4316: Correct by instructor override.
4317:
4318: =item * B<EXCUSED>:
4319:
4320: Excused. Not yet implemented.
4321:
4322: =item * B<NETWORK_FAILURE>:
4323:
4324: Information not available due to network failure.
4325:
4326: =item * B<ATTEMPTED>:
4327:
4328: Attempted, and not yet graded.
4329:
4330: =back
4331:
4332: =cut
4333:
4334: sub NOT_ATTEMPTED { return 10; }
4335: sub INCORRECT { return 11; }
4336: sub INCORRECT_BY_OVERRIDE { return 12; }
4337: sub CORRECT { return 13; }
4338: sub CORRECT_BY_OVERRIDE { return 14; }
4339: sub EXCUSED { return 15; }
4340: sub ATTEMPTED { return 16; }
4341:
4342: sub getCompletionStatus {
4343: my $self = shift;
4344: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4345:
4346: my $status = $self->queryRestoreHash('solved', shift);
4347:
4348: # Left as separate if statements in case we ever do more with this
4349: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4350: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4351: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
4352: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4353: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4354: if ($status eq 'excused') {return $self->EXCUSED; }
4355: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4356: return $self->NOT_ATTEMPTED;
4357: }
4358:
4359: sub queryRestoreHash {
4360: my $self = shift;
4361: my $hashentry = shift;
4362: my $part = shift;
4363: $part = "0" if (!defined($part) || $part eq '');
4364: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4365:
4366: $self->getReturnHash();
4367:
4368: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4369: }
4370:
4371: =pod
4372:
4373: B<Composite Status>
4374:
4375: Along with directly returning the date or completion status, the
4376: resource object includes a convenience function B<status>() that will
4377: combine the two status tidbits into one composite status that can
4378: represent the status of the resource as a whole. This method represents
4379: the concept of the thing we want to display to the user on the nav maps
4380: screen, which is a combination of completion and open status. The precise logic is
4381: documented in the comments of the status method. The following results
4382: may be returned, all available as methods on the resource object
4383: ($res->NETWORK_FAILURE): In addition to the return values that match
4384: the date or completion status, this function can return "ANSWER_SUBMITTED"
4385: if that problemstatus parameter value is set to No, suppressing the
4386: incorrect/correct feedback.
4387:
4388: =over 4
4389:
4390: =item * B<NETWORK_FAILURE>:
4391:
4392: The network has failed and the information is not available.
4393:
4394: =item * B<NOTHING_SET>:
4395:
4396: No dates have been set for this problem (part) at all. (Because only
4397: certain parts of a multi-part problem may be assigned, this can not be
4398: collapsed into "open later", as we do not know a given part will EVER
4399: be opened. For single part, this is the same as "OPEN_LATER".)
4400:
4401: =item * B<CORRECT>:
4402:
4403: For any reason at all, the part is considered correct.
4404:
4405: =item * B<EXCUSED>:
4406:
4407: For any reason at all, the problem is excused.
4408:
4409: =item * B<PAST_DUE_NO_ANSWER>:
4410:
4411: The problem is past due, not considered correct, and no answer date is
4412: set.
4413:
4414: =item * B<PAST_DUE_ANSWER_LATER>:
4415:
4416: The problem is past due, not considered correct, and an answer date in
4417: the future is set.
4418:
4419: =item * B<ANSWER_OPEN>:
4420:
4421: The problem is past due, not correct, and the answer is now available.
4422:
4423: =item * B<OPEN_LATER>:
4424:
4425: The problem is not yet open.
4426:
4427: =item * B<TRIES_LEFT>:
4428:
4429: The problem is open, has been tried, is not correct, but there are
4430: tries left.
4431:
4432: =item * B<INCORRECT>:
4433:
4434: The problem is open, and all tries have been used without getting the
4435: correct answer.
4436:
4437: =item * B<OPEN>:
4438:
4439: The item is open and not yet tried.
4440:
4441: =item * B<ATTEMPTED>:
4442:
4443: The problem has been attempted.
4444:
4445: =item * B<ANSWER_SUBMITTED>:
4446:
4447: An answer has been submitted, but the student should not see it.
4448:
4449: =back
4450:
4451: =cut
4452:
4453: sub TRIES_LEFT { return 20; }
4454: sub ANSWER_SUBMITTED { return 21; }
4455:
4456: sub status {
4457: my $self = shift;
4458: my $part = shift;
4459: if (!defined($part)) { $part = "0"; }
4460: my $completionStatus = $self->getCompletionStatus($part);
4461: my $dateStatus = $self->getDateStatus($part);
4462:
4463: # What we have is a two-dimensional matrix with 4 entries on one
4464: # dimension and 5 entries on the other, which we want to colorize,
4465: # plus network failure and "no date data at all".
4466:
4467: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4468: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4469:
4470: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4471: # If there's an answer date and we're past it, don't
4472: # suppress the feedback; student should know
4473: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4474: $suppressFeedback = 0;
4475: }
4476:
4477: # There are a few whole rows we can dispose of:
4478: if ($completionStatus == CORRECT ||
4479: $completionStatus == CORRECT_BY_OVERRIDE ) {
4480: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4481: }
4482:
4483: if ($completionStatus == ATTEMPTED) {
4484: return ATTEMPTED;
4485: }
4486:
4487: # If it's EXCUSED, then return that no matter what
4488: if ($completionStatus == EXCUSED) {
4489: return EXCUSED;
4490: }
4491:
4492: if ($dateStatus == NOTHING_SET) {
4493: return NOTHING_SET;
4494: }
4495:
4496: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4497: # by 4 matrix (date statuses).
4498:
4499: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4500: $dateStatus == PAST_DUE_NO_ANSWER ) {
4501: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4502: }
4503:
4504: if ($dateStatus == ANSWER_OPEN) {
4505: return ANSWER_OPEN;
4506: }
4507:
4508: # Now: (incorrect, incorrect_override, not_attempted) x
4509: # (open_later), (open)
4510:
4511: if ($dateStatus == OPEN_LATER) {
4512: return OPEN_LATER;
4513: }
4514:
4515: # If it's WRONG...
4516: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4517: # and there are TRIES LEFT:
4518: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4519: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4520: }
4521: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4522: }
4523:
4524: # Otherwise, it's untried and open
4525: return OPEN;
4526: }
4527:
4528: sub CLOSED { return 23; }
4529: sub ERROR { return 24; }
4530:
4531: =pod
4532:
4533: B<Simple Status>
4534:
4535: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4536: "Simple status" corresponds to "which icon is shown on the
4537: Navmaps". There are six "simple" statuses:
4538:
4539: =over 4
4540:
4541: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4542:
4543: =item * B<OPEN>: The problem is open and unattempted.
4544:
4545: =item * B<CORRECT>: The problem is correct for any reason.
4546:
4547: =item * B<INCORRECT>: The problem is incorrect and can still be
4548: completed successfully.
4549:
4550: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4551: does not know if they are correct. (The ellipsis icon.)
4552:
4553: =item * B<ERROR>: There is an error retrieving information about this
4554: problem.
4555:
4556: =back
4557:
4558: =cut
4559:
4560: # This hash maps the composite status to this simple status, and
4561: # can be used directly, if you like
4562: my %compositeToSimple =
4563: (
4564: NETWORK_FAILURE() => ERROR,
4565: NOTHING_SET() => CLOSED,
4566: CORRECT() => CORRECT,
4567: EXCUSED() => CORRECT,
4568: PAST_DUE_NO_ANSWER() => INCORRECT,
4569: PAST_DUE_ANSWER_LATER() => INCORRECT,
4570: ANSWER_OPEN() => INCORRECT,
4571: OPEN_LATER() => CLOSED,
4572: TRIES_LEFT() => OPEN,
4573: INCORRECT() => INCORRECT,
4574: OPEN() => OPEN,
4575: ATTEMPTED() => ATTEMPTED,
4576: ANSWER_SUBMITTED() => ATTEMPTED
4577: );
4578:
4579: sub simpleStatus {
4580: my $self = shift;
4581: my $part = shift;
4582: my $status = $self->status($part);
4583: return $compositeToSimple{$status};
4584: }
4585:
4586: =pod
4587:
4588: B<simpleStatusCount> will return an array reference containing, in
4589: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4590: and ERROR parts the given problem has.
4591:
4592: =cut
4593:
4594: # This maps the status to the slot we want to increment
4595: my %statusToSlotMap =
4596: (
4597: OPEN() => 0,
4598: CLOSED() => 1,
4599: CORRECT() => 2,
4600: INCORRECT() => 3,
4601: ATTEMPTED() => 4,
4602: ERROR() => 5
4603: );
4604:
4605: sub statusToSlot { return $statusToSlotMap{shift()}; }
4606:
4607: sub simpleStatusCount {
4608: my $self = shift;
4609:
4610: my @counts = (0, 0, 0, 0, 0, 0, 0);
4611: foreach my $part (@{$self->parts()}) {
4612: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4613: }
4614:
4615: return \@counts;
4616: }
4617:
4618: =pod
4619:
4620: B<Completable>
4621:
4622: The completable method represents the concept of I<whether the student can
4623: currently do the problem>. If the student can do the problem, which means
4624: that it is open, there are tries left, and if the problem is manually graded
4625: or the grade is suppressed via problemstatus, the student has not tried it
4626: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4627: either the student has tried it and there is no feedback, or that for
4628: some reason it is no longer completable (not open yet, successfully completed,
4629: out of tries, etc.). As an example, this is used as the filter for the
4630: "Uncompleted Homework" option for the nav maps.
4631:
4632: If this does not quite meet your needs, do not fiddle with it (unless you are
4633: fixing it to better match the student's conception of "completable" because
4634: it's broken somehow)... make a new method.
4635:
4636: =cut
4637:
4638: sub completable {
4639: my $self = shift;
4640: if (!$self->is_problem()) { return 0; }
4641: my $partCount = $self->countParts();
4642:
4643: foreach my $part (@{$self->parts()}) {
4644: if ($part eq '0' && $partCount != 1) { next; }
4645: my $status = $self->status($part);
4646: # "If any of the parts are open, or have tries left (implies open),
4647: # and it is not "attempted" (manually graded problem), it is
4648: # not "complete"
4649: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4650: $status == ANSWER_SUBMITTED() ) {
4651: # did this part already, as well as we can
4652: next;
4653: }
4654: if ($status == OPEN() || $status == TRIES_LEFT()) {
4655: return 1;
4656: }
4657: }
4658:
4659: # If all the parts were complete, so was this problem.
4660: return 0;
4661: }
4662:
4663: =pod
4664:
4665: =head2 Resource/Nav Map Navigation
4666:
4667: =over 4
4668:
4669: =item * B<getNext>():
4670:
4671: Retreive an array of the possible next resources after this
4672: one. Always returns an array, even in the one- or zero-element case.
4673:
4674: =item * B<getPrevious>():
4675:
4676: Retreive an array of the possible previous resources from this
4677: one. Always returns an array, even in the one- or zero-element case.
4678:
4679: =cut
4680:
4681: sub getNext {
4682: my $self = shift;
4683: my @branches;
4684: my $to = $self->to();
4685: foreach my $branch ( split(/,/, $to) ) {
4686: my $choice = $self->{NAV_MAP}->getById($branch);
4687: my $next = $choice->goesto();
4688: $next = $self->{NAV_MAP}->getById($next);
4689:
4690: push @branches, $next;
4691: }
4692: return \@branches;
4693: }
4694:
4695: sub getPrevious {
4696: my $self = shift;
4697: my @branches;
4698: my $from = $self->from();
4699: foreach my $branch ( split /,/, $from) {
4700: my $choice = $self->{NAV_MAP}->getById($branch);
4701: my $prev = $choice->comesfrom();
4702: $prev = $self->{NAV_MAP}->getById($prev);
4703:
4704: push @branches, $prev;
4705: }
4706: return \@branches;
4707: }
4708:
4709: sub browsePriv {
4710: my $self = shift;
4711: if (defined($self->{BROWSE_PRIV})) {
4712: return $self->{BROWSE_PRIV};
4713: }
4714:
4715: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4716: }
4717:
4718: =pod
4719:
4720: =back
4721:
4722: =cut
4723:
4724: 1;
4725:
4726: __END__
4727:
4728:
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