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[LON-CAPA] /
loncom /
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lonnavmaps.pm
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Mon Oct 4 21:35:52 2004 UTC (19 years, 8 months ago) by
raeburn
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Fix bug #3515. identification of resources with discussion now occurs in lonfeedback after 'Mark all posts as read call'. To simplify further we might want to eliminate the extra code in lonnavmaps, called when sort is by "Has Discussion" and always do the resource->has_discussion call in lonfeedback.
1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.299 2004/10/04 21:35:52 raeburn 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: $result .= (<<END);
1589: <input type="hidden" name="navmaps" value="$haveDisc" />
1590: </form>
1591: END
1592: }
1593: }
1594: $result.='</form>';
1595: }
1596:
1597: if ($args->{'caller'} eq 'navmapsdisplay') {
1598: $result .= '<table><tr><td>'.
1599: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1600: if ($ENV{'environment.remotenavmap'} ne 'on') {
1601: $result .= '<td> </td>';
1602: } else {
1603: $result .= '</tr><tr>';
1604: }
1605: $result.=&show_linkitems($args->{'linkitems'});
1606: if ($args->{'sort_html'}) {
1607: if ($ENV{'environment.remotenavmap'} ne 'on') {
1608: $result.='<td> </td><td> </td><td> </td>'.
1609: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1610: } else {
1611: $result.='</tr><tr><td align="left"><br />'.
1612: $args->{'sort_html'}.'</td></tr>';
1613: }
1614: }
1615: $result .= '</table>';
1616: } elsif ($args->{'sort_html'}) {
1617: $result.=$args->{'sort_html'};
1618: }
1619:
1620: $result .= "<br />\n";
1621: if ($r) {
1622: $r->print($result);
1623: $r->rflush();
1624: $result = "";
1625: }
1626: # End parameter setting
1627:
1628: # Data
1629: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1630: my $res = "Apache::lonnavmaps::resource";
1631: my %condenseStatuses =
1632: ( $res->NETWORK_FAILURE => 1,
1633: $res->NOTHING_SET => 1,
1634: $res->CORRECT => 1 );
1635: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1636:
1637: # Shared variables
1638: $args->{'counter'} = 0; # counts the rows
1639: $args->{'indentLevel'} = 0;
1640: $args->{'isNewBranch'} = 0;
1641: $args->{'condensed'} = 0;
1642: my $location=
1643: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1644: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='' border='0' />");
1645: $args->{'displayedHereMarker'} = 0;
1646:
1647: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1648: # since structure actually doesn't matter, except what map has what resources.
1649: if ($args->{'suppressEmptySequences'}) {
1650: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1651: $it->{FIRST_RESOURCE},
1652: $it->{FINISH_RESOURCE},
1653: {}, undef, 1);
1654: my $depth = 0;
1655: $dfsit->next();
1656: my $curRes = $dfsit->next();
1657: while ($depth > -1) {
1658: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1659: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1660:
1661: if (ref($curRes)) {
1662: # Parallel pre-processing: Do sequences have non-filtered-out children?
1663: if ($curRes->is_map()) {
1664: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1665: # Sequences themselves do not count as visible children,
1666: # unless those sequences also have visible children.
1667: # This means if a sequence appears, there's a "promise"
1668: # that there's something under it if you open it, somewhere.
1669: } else {
1670: # Not a sequence: if it's filtered, ignore it, otherwise
1671: # rise up the stack and mark the sequences as having children
1672: if (&$filterFunc($curRes)) {
1673: for my $sequence (@{$dfsit->getStack()}) {
1674: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1675: }
1676: }
1677: }
1678: }
1679: } continue {
1680: $curRes = $dfsit->next();
1681: }
1682: }
1683:
1684: my $displayedJumpMarker = 0;
1685: # Set up iteration.
1686: my $now = time();
1687: my $in24Hours = $now + 24 * 60 * 60;
1688: my $rownum = 0;
1689:
1690: # export "here" marker information
1691: $args->{'here'} = $here;
1692:
1693: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1694: my @resources;
1695: my $code='';# sub { !(shift->is_map();) };
1696: if ($args->{'sort'} eq 'title') {
1697: my $oldFilterFunc = $filterFunc;
1698: my $filterFunc=
1699: sub {
1700: my ($res)=@_;
1701: if ($res->is_map()) { return 0;}
1702: return &$oldFilterFunc($res);
1703: };
1704: @resources=$navmap->retrieveResources(undef,$filterFunc);
1705: @resources= sort { &cmp_title($a,$b) } @resources;
1706: } elsif ($args->{'sort'} eq 'duedate') {
1707: my $oldFilterFunc = $filterFunc;
1708: my $filterFunc=
1709: sub {
1710: my ($res)=@_;
1711: if (!$res->is_problem()) { return 0;}
1712: return &$oldFilterFunc($res);
1713: };
1714: @resources=$navmap->retrieveResources(undef,$filterFunc);
1715: @resources= sort {
1716: if ($a->duedate ne $b->duedate) {
1717: return $a->duedate cmp $b->duedate;
1718: }
1719: my $value=&cmp_title($a,$b);
1720: return $value;
1721: } @resources;
1722: } elsif ($args->{'sort'} eq 'discussion') {
1723: my $oldFilterFunc = $filterFunc;
1724: my $filterFunc=
1725: sub {
1726: my ($res)=@_;
1727: if (!$res->hasDiscussion() &&
1728: !$res->getFeedback() &&
1729: !$res->getErrors()) { return 0;}
1730: return &$oldFilterFunc($res);
1731: };
1732: @resources=$navmap->retrieveResources(undef,$filterFunc);
1733: @resources= sort { &cmp_title($a,$b) } @resources;
1734: } else {
1735: #unknow sort mechanism or default
1736: undef($args->{'sort'});
1737: }
1738:
1739:
1740: while (1) {
1741: if ($args->{'sort'}) {
1742: $curRes = shift(@resources);
1743: } else {
1744: $curRes = $it->next($closeAllPages);
1745: }
1746: if (!$curRes) { last; }
1747:
1748: # Maintain indentation level.
1749: if ($curRes == $it->BEGIN_MAP() ||
1750: $curRes == $it->BEGIN_BRANCH() ) {
1751: $args->{'indentLevel'}++;
1752: }
1753: if ($curRes == $it->END_MAP() ||
1754: $curRes == $it->END_BRANCH() ) {
1755: $args->{'indentLevel'}--;
1756: }
1757: # Notice new branches
1758: if ($curRes == $it->BEGIN_BRANCH()) {
1759: $args->{'isNewBranch'} = 1;
1760: }
1761:
1762: # If this isn't an actual resource, continue on
1763: if (!ref($curRes)) {
1764: next;
1765: }
1766:
1767: # If this has been filtered out, continue on
1768: if (!(&$filterFunc($curRes))) {
1769: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1770: next;
1771: }
1772:
1773: # If this is an empty sequence and we're filtering them, continue on
1774: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1775: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1776: next;
1777: }
1778:
1779: # If we're suppressing navmaps and this is a navmap, continue on
1780: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1781: next;
1782: }
1783:
1784: $args->{'counter'}++;
1785:
1786: # Does it have multiple parts?
1787: $args->{'multipart'} = 0;
1788: $args->{'condensed'} = 0;
1789: my @parts;
1790:
1791: # Decide what parts to show.
1792: if ($curRes->is_problem() && $showParts) {
1793: @parts = @{$curRes->parts()};
1794: $args->{'multipart'} = $curRes->multipart();
1795:
1796: if ($condenseParts) { # do the condensation
1797: if (!$curRes->opendate("0")) {
1798: @parts = ();
1799: $args->{'condensed'} = 1;
1800: }
1801: if (!$args->{'condensed'}) {
1802: # Decide whether to condense based on similarity
1803: my $status = $curRes->status($parts[0]);
1804: my $due = $curRes->duedate($parts[0]);
1805: my $open = $curRes->opendate($parts[0]);
1806: my $statusAllSame = 1;
1807: my $dueAllSame = 1;
1808: my $openAllSame = 1;
1809: for (my $i = 1; $i < scalar(@parts); $i++) {
1810: if ($curRes->status($parts[$i]) != $status){
1811: $statusAllSame = 0;
1812: }
1813: if ($curRes->duedate($parts[$i]) != $due ) {
1814: $dueAllSame = 0;
1815: }
1816: if ($curRes->opendate($parts[$i]) != $open) {
1817: $openAllSame = 0;
1818: }
1819: }
1820: # $*allSame is true if all the statuses were
1821: # the same. Now, if they are all the same and
1822: # match one of the statuses to condense, or they
1823: # are all open with the same due date, or they are
1824: # all OPEN_LATER with the same open date, display the
1825: # status of the first non-zero part (to get the 'correct'
1826: # status right, since 0 is never 'correct' or 'open').
1827: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1828: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1829: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1830: @parts = ($parts[0]);
1831: $args->{'condensed'} = 1;
1832: }
1833: }
1834: # Multipart problem with one part: always "condense" (happens
1835: # to match the desirable behavior)
1836: if ($curRes->countParts() == 1) {
1837: @parts = ($parts[0]);
1838: $args->{'condensed'} = 1;
1839: }
1840: }
1841: }
1842:
1843: # If the multipart problem was condensed, "forget" it was multipart
1844: if (scalar(@parts) == 1) {
1845: $args->{'multipart'} = 0;
1846: } else {
1847: # Add part 0 so we display it correctly.
1848: unshift @parts, '0';
1849: }
1850:
1851: # Now, we've decided what parts to show. Loop through them and
1852: # show them.
1853: foreach my $part (@parts) {
1854: $rownum ++;
1855: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1856:
1857: $result .= " <tr bgcolor='$backgroundColor'>\n";
1858:
1859: # Set up some data about the parts that the cols might want
1860: my $filter = $it->{FILTER};
1861: my $src;
1862: if ($args->{'sort'}) {
1863: $src = $curRes->src(); # FIXME this is wrong for .pages
1864: } else {
1865: my $stack = $it->getStack();
1866: $src=getLinkForResource($stack);
1867: }
1868: my $anchor='';
1869: if ($src=~s/(\#.*)$//) {
1870: $anchor=$1;
1871: }
1872: my $srcHasQuestion = $src =~ /\?/;
1873: $args->{"resourceLink"} = $src.
1874: ($srcHasQuestion?'&':'?') .
1875: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1876: $anchor;
1877:
1878: # Now, display each column.
1879: foreach my $col (@$cols) {
1880: my $colHTML = '';
1881: if (ref($col)) {
1882: $colHTML .= &$col($curRes, $part, $args);
1883: } else {
1884: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1885: }
1886:
1887: # If this is the first column and it's time to print
1888: # the anchor, do so
1889: if ($col == $cols->[0] &&
1890: $args->{'counter'} == $args->{'currentJumpIndex'} -
1891: $currentJumpDelta) {
1892: # Jam the anchor after the <td> tag;
1893: # necessary for valid HTML (which Mozilla requires)
1894: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1895: $displayedJumpMarker = 1;
1896: }
1897: $result .= $colHTML . "\n";
1898: }
1899: $result .= " </tr>\n";
1900: $args->{'isNewBranch'} = 0;
1901: }
1902:
1903: if ($r && $rownum % 20 == 0) {
1904: $r->print($result);
1905: $result = "";
1906: $r->rflush();
1907: }
1908: } continue {
1909: if ($r) {
1910: # If we have the connection, make sure the user is still connected
1911: my $c = $r->connection;
1912: if ($c->aborted()) {
1913: # Who cares what we do, nobody will see it anyhow.
1914: return '';
1915: }
1916: }
1917: }
1918:
1919: # Print out the part that jumps to #curloc if it exists
1920: # delay needed because the browser is processing the jump before
1921: # it finishes rendering, so it goes to the wrong place!
1922: # onload might be better, but this routine has no access to that.
1923: # On mozilla, the 0-millisecond timeout seems to prevent this;
1924: # it's quite likely this might fix other browsers, too, and
1925: # certainly won't hurt anything.
1926: if ($displayedJumpMarker) {
1927: $result .= "
1928: <script>
1929: if (location.href.indexOf('#curloc')==-1) {
1930: setTimeout(\"location += '#curloc';\", 0)
1931: }
1932: </script>";
1933: }
1934:
1935: $result .= "</table>";
1936:
1937: if ($r) {
1938: $r->print($result);
1939: $result = "";
1940: $r->rflush();
1941: }
1942:
1943: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1944:
1945: return $result;
1946: }
1947:
1948: sub add_linkitem {
1949: my ($linkitems,$name,$cmd,$text)=@_;
1950: $$linkitems{$name}{'cmd'}=$cmd;
1951: $$linkitems{$name}{'text'}=&mt($text);
1952: }
1953:
1954: sub show_linkitems {
1955: my ($linkitems)=@_;
1956: my @linkorder = ("launchnav","closenav","firsthomework","everything",
1957: "uncompleted","changefolder","clearbubbles");
1958:
1959: my $result .= (<<ENDBLOCK);
1960: <td align="left">
1961: <script type="text/javascript">
1962: function changeNavDisplay () {
1963: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1964: ENDBLOCK
1965: foreach my $link (@linkorder) {
1966: $result.= "if (navchoice == '$link') {".
1967: $linkitems->{$link}{'cmd'}."}\n";
1968: }
1969: $result.='}
1970: </script>
1971: <form name="linkitems" method="post">
1972: <nobr><select name="toplink">'."\n";
1973: foreach my $link (@linkorder) {
1974: if (defined($linkitems->{$link})) {
1975: if ($linkitems->{$link}{'text'} ne '') {
1976: $result .= ' <option value="'.$link.'">'.
1977: $linkitems->{$link}{'text'}."</option>\n";
1978: }
1979: }
1980: }
1981: $result .= '</select> <input type="button" name="chgnav"
1982: value="Go" onClick="javascript:changeNavDisplay()" />
1983: </nobr></form></td>'."\n";
1984:
1985: return $result;
1986: }
1987:
1988: 1;
1989:
1990: package Apache::lonnavmaps::navmap;
1991:
1992: =pod
1993:
1994: =head1 Object: Apache::lonnavmaps::navmap
1995:
1996: =head2 Overview
1997:
1998: The navmap object's job is to provide access to the resources
1999: in the course as Apache::lonnavmaps::resource objects, and to
2000: query and manage the relationship between those resource objects.
2001:
2002: Generally, you'll use the navmap object in one of three basic ways.
2003: In order of increasing complexity and power:
2004:
2005: =over 4
2006:
2007: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2008: various ways to obtain resource objects, based on various identifiers.
2009: Use this when you want to request information about one object or
2010: a handful of resources you already know the identities of, from some
2011: other source. For more about Ids, Symbs, and MapPcs, see the
2012: Resource documentation. Note that Url should be a B<last resort>,
2013: not your first choice; it only works when there is only one
2014: instance of the resource in the course, which only applies to
2015: maps, and even that may change in the future.
2016:
2017: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2018: retrieves resources matching some criterion and returns them
2019: in a flat array, with no structure information. Use this when
2020: you are manipulating a series of resources, based on what map
2021: the are in, but do not care about branching, or exactly how
2022: the maps and resources are related. This is the most common case.
2023:
2024: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2025: the course's navmap in various ways without writing the traversal
2026: code yourself. See iterator documentation below. Use this when
2027: you need to know absolutely everything about the course, including
2028: branches and the precise relationship between maps and resources.
2029:
2030: =back
2031:
2032: =head2 Creation And Destruction
2033:
2034: To create a navmap object, use the following function:
2035:
2036: =over 4
2037:
2038: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2039:
2040: Creates a new navmap object. Returns the navmap object if this is
2041: successful, or B<undef> if not.
2042:
2043: =back
2044:
2045: When you are done with the $navmap object, you I<must> call
2046: $navmap->untieHashes(), or you'll prevent the current user from using that
2047: course until the web server is restarted. (!)
2048:
2049: =head2 Methods
2050:
2051: =over 4
2052:
2053: =item * B<getIterator>(first, finish, filter, condition):
2054:
2055: See iterator documentation below.
2056:
2057: =cut
2058:
2059: use strict;
2060: use GDBM_File;
2061:
2062: sub new {
2063: # magic invocation to create a class instance
2064: my $proto = shift;
2065: my $class = ref($proto) || $proto;
2066: my $self = {};
2067:
2068: # Resource cache stores navmap resources as we reference them. We generate
2069: # them on-demand so we don't pay for creating resources unless we use them.
2070: $self->{RESOURCE_CACHE} = {};
2071:
2072: # Network failure flag, if we accessed the course or user opt and
2073: # failed
2074: $self->{NETWORK_FAILURE} = 0;
2075:
2076: # tie the nav hash
2077:
2078: my %navmaphash;
2079: my %parmhash;
2080: my $courseFn = $ENV{"request.course.fn"};
2081: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2082: &GDBM_READER(), 0640))) {
2083: return undef;
2084: }
2085:
2086: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2087: &GDBM_READER(), 0640)))
2088: {
2089: untie %{$self->{PARM_HASH}};
2090: return undef;
2091: }
2092:
2093: $self->{NAV_HASH} = \%navmaphash;
2094: $self->{PARM_HASH} = \%parmhash;
2095: $self->{PARM_CACHE} = {};
2096:
2097: bless($self);
2098:
2099: return $self;
2100: }
2101:
2102: sub generate_course_user_opt {
2103: my $self = shift;
2104: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2105:
2106: my $uname=$ENV{'user.name'};
2107: my $udom=$ENV{'user.domain'};
2108: my $uhome=$ENV{'user.home'};
2109: my $cid=$ENV{'request.course.id'};
2110: my $chome=$ENV{'course.'.$cid.'.home'};
2111: my ($cdom,$cnum)=split(/\_/,$cid);
2112:
2113: my $userprefix=$uname.'_'.$udom.'_';
2114:
2115: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
2116: unless ($uhome eq 'no_host') {
2117: # ------------------------------------------------- Get coursedata (if present)
2118: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
2119: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
2120: ':resourcedata',$chome);
2121: # Check for network failure
2122: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
2123: $self->{NETWORK_FAILURE} = 1;
2124: } elsif ($reply!~/^error\:/) {
2125: $courserdatas{$cid}=$reply;
2126: $courserdatas{$cid.'.last_cache'}=time;
2127: }
2128: }
2129: foreach (split(/\&/,$courserdatas{$cid})) {
2130: my ($name,$value)=split(/\=/,$_);
2131: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
2132: &Apache::lonnet::unescape($value);
2133: }
2134: # --------------------------------------------------- Get userdata (if present)
2135: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
2136: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
2137: if ($reply!~/^error\:/) {
2138: $userrdatas{$uname.'___'.$udom}=$reply;
2139: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
2140: }
2141: # check to see if network failed
2142: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
2143: {
2144: $self->{NETWORK_FAILURE} = 1;
2145: }
2146: }
2147: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
2148: my ($name,$value)=split(/\=/,$_);
2149: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
2150: &Apache::lonnet::unescape($value);
2151: }
2152: $self->{COURSE_OPT} = \%courseopt;
2153: $self->{USER_OPT} = \%useropt;
2154: }
2155:
2156: $self->{COURSE_USER_OPT_GENERATED} = 1;
2157:
2158: return;
2159: }
2160:
2161: sub generate_email_discuss_status {
2162: my $self = shift;
2163: my $symb = shift;
2164: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2165:
2166: my $cid=$ENV{'request.course.id'};
2167: my ($cdom,$cnum)=split(/\_/,$cid);
2168:
2169: my %emailstatus = &Apache::lonnet::dump('email_status');
2170: my $logoutTime = $emailstatus{'logout'};
2171: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
2172: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2173: $courseLeaveTime : $logoutTime);
2174: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2175: $cdom, $cnum);
2176: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2177: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
2178: my %lastreadtime = ();
2179: foreach (keys %lastread) {
2180: my $key = $_;
2181: $key =~ s/_lastread$//;
2182: $lastreadtime{$key} = $lastread{$_};
2183: }
2184:
2185: my %feedback=();
2186: my %error=();
2187: my $keys = &Apache::lonnet::reply('keys:'.
2188: $ENV{'user.domain'}.':'.
2189: $ENV{'user.name'}.':nohist_email',
2190: $ENV{'user.home'});
2191:
2192: foreach my $msgid (split(/\&/, $keys)) {
2193: $msgid=&Apache::lonnet::unescape($msgid);
2194: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2195: my $plain=
2196: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2197: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2198: my ($what,$url)=($1,$2);
2199: if ($what eq 'Error') {
2200: $error{$url}.=','.$msgid;
2201: } else {
2202: $feedback{$url}.=','.$msgid;
2203: }
2204: }
2205: }
2206: }
2207:
2208: #url's of resources that have feedbacks
2209: $self->{FEEDBACK} = \%feedback;
2210: #or errors
2211: $self->{ERROR_MSG} = \%error;
2212: $self->{DISCUSSION_TIME} = \%discussiontime;
2213: $self->{EMAIL_STATUS} = \%emailstatus;
2214: $self->{LAST_READ} = \%lastreadtime;
2215:
2216: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2217: }
2218:
2219: sub get_user_data {
2220: my $self = shift;
2221: if ($self->{RETRIEVED_USER_DATA}) { return; }
2222:
2223: # Retrieve performance data on problems
2224: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
2225: $ENV{'user.domain'},
2226: $ENV{'user.name'});
2227: $self->{STUDENT_DATA} = \%student_data;
2228:
2229: $self->{RETRIEVED_USER_DATA} = 1;
2230: }
2231:
2232: # Internal function: Takes a key to look up in the nav hash and implements internal
2233: # memory caching of that key.
2234: sub navhash {
2235: my $self = shift; my $key = shift;
2236: return $self->{NAV_HASH}->{$key};
2237: }
2238:
2239: =pod
2240:
2241: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2242: false otherwise. Undefined course maps indicate an error somewhere in
2243: LON-CAPA, and you will not be able to proceed with using the navmap.
2244: See the B<NAV> screen for an example of using this.
2245:
2246: =cut
2247:
2248: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2249: sub courseMapDefined {
2250: my $self = shift;
2251: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
2252:
2253: my $firstres = $self->navhash("map_start_$uri");
2254: my $lastres = $self->navhash("map_finish_$uri");
2255: return $firstres && $lastres;
2256: }
2257:
2258: sub getIterator {
2259: my $self = shift;
2260: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2261: shift, undef, shift);
2262: return $iterator;
2263: }
2264:
2265: # unties the hash when done
2266: sub untieHashes {
2267: my $self = shift;
2268: untie %{$self->{NAV_HASH}};
2269: untie %{$self->{PARM_HASH}};
2270: }
2271:
2272: # Private method: Does the given resource (as a symb string) have
2273: # current discussion? Returns 0 if chat/mail data not extracted.
2274: sub hasDiscussion {
2275: my $self = shift;
2276: my $symb = shift;
2277:
2278: $self->generate_email_discuss_status();
2279:
2280: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2281:
2282: #return defined($self->{DISCUSSION_TIME}->{$symb});
2283:
2284: # backward compatibility (bulletin boards used to be 'wrapped')
2285: my $ressymb = $symb;
2286: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
2287: unless ($ressymb =~ m|adm/wrapper/adm|) {
2288: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
2289: }
2290: }
2291:
2292: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2293: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2294: } else {
2295: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2296: 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).
2297: }
2298: }
2299:
2300: # Private method: Does the given resource (as a symb string) have
2301: # current feedback? Returns the string in the feedback hash, which
2302: # will be false if it does not exist.
2303: sub getFeedback {
2304: my $self = shift;
2305: my $symb = shift;
2306:
2307: $self->generate_email_discuss_status();
2308:
2309: if (!defined($self->{FEEDBACK})) { return ""; }
2310:
2311: return $self->{FEEDBACK}->{$symb};
2312: }
2313:
2314: # Private method: Get the errors for that resource (by source).
2315: sub getErrors {
2316: my $self = shift;
2317: my $src = shift;
2318:
2319: $self->generate_email_discuss_status();
2320:
2321: if (!defined($self->{ERROR_MSG})) { return ""; }
2322: return $self->{ERROR_MSG}->{$src};
2323: }
2324:
2325: =pod
2326:
2327: =item * B<getById>(id):
2328:
2329: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2330: object for that resource. This method, or other methods that use it
2331: (as in the resource object) is the only proper way to obtain a
2332: resource object.
2333:
2334: =item * B<getBySymb>(symb):
2335:
2336: Based on the symb of the resource, get a resource object for that
2337: resource. This is one of the proper ways to get a resource object.
2338:
2339: =item * B<getMapByMapPc>(map_pc):
2340:
2341: Based on the map_pc of the resource, get a resource object for
2342: the given map. This is one of the proper ways to get a resource object.
2343:
2344: =cut
2345:
2346: # The strategy here is to cache the resource objects, and only construct them
2347: # as we use them. The real point is to prevent reading any more from the tied
2348: # hash then we have to, which should hopefully alleviate speed problems.
2349:
2350: sub getById {
2351: my $self = shift;
2352: my $id = shift;
2353:
2354: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2355: {
2356: return $self->{RESOURCE_CACHE}->{$id};
2357: }
2358:
2359: # resource handles inserting itself into cache.
2360: # Not clear why the quotes are necessary, but as of this
2361: # writing it doesn't work without them.
2362: return "Apache::lonnavmaps::resource"->new($self, $id);
2363: }
2364:
2365: sub getBySymb {
2366: my $self = shift;
2367: my $symb = shift;
2368:
2369: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2370: my $map = $self->getResourceByUrl($mapUrl);
2371: my $returnvalue = undef;
2372: if (ref($map)) {
2373: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2374: }
2375: return $returnvalue;
2376: }
2377:
2378: sub getByMapPc {
2379: my $self = shift;
2380: my $map_pc = shift;
2381: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2382: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2383: return $self->getById($map_id);
2384: }
2385:
2386: =pod
2387:
2388: =item * B<firstResource>():
2389:
2390: Returns a resource object reference corresponding to the first
2391: resource in the navmap.
2392:
2393: =cut
2394:
2395: sub firstResource {
2396: my $self = shift;
2397: my $firstResource = $self->navhash('map_start_' .
2398: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2399: return $self->getById($firstResource);
2400: }
2401:
2402: =pod
2403:
2404: =item * B<finishResource>():
2405:
2406: Returns a resource object reference corresponding to the last resource
2407: in the navmap.
2408:
2409: =cut
2410:
2411: sub finishResource {
2412: my $self = shift;
2413: my $firstResource = $self->navhash('map_finish_' .
2414: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2415: return $self->getById($firstResource);
2416: }
2417:
2418: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2419: # the actual lookup; parmval caches the results.
2420: sub parmval {
2421: my $self = shift;
2422: my ($what,$symb)=@_;
2423: my $hashkey = $what."|||".$symb;
2424:
2425: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2426: return $self->{PARM_CACHE}->{$hashkey};
2427: }
2428:
2429: my $result = $self->parmval_real($what, $symb);
2430: $self->{PARM_CACHE}->{$hashkey} = $result;
2431: return $result;
2432: }
2433:
2434: sub parmval_real {
2435: my $self = shift;
2436: my ($what,$symb,$recurse) = @_;
2437:
2438: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2439: $self->generate_course_user_opt();
2440:
2441: my $cid=$ENV{'request.course.id'};
2442: my $csec=$ENV{'request.course.sec'};
2443: my $uname=$ENV{'user.name'};
2444: my $udom=$ENV{'user.domain'};
2445:
2446: unless ($symb) { return ''; }
2447: my $result='';
2448:
2449: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2450:
2451: # ----------------------------------------------------- Cascading lookup scheme
2452: my $rwhat=$what;
2453: $what=~s/^parameter\_//;
2454: $what=~s/\_/\./;
2455:
2456: my $symbparm=$symb.'.'.$what;
2457: my $mapparm=$mapname.'___(all).'.$what;
2458: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2459:
2460: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2461: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2462: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2463:
2464: my $courselevel= $usercourseprefix.'.'.$what;
2465: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2466: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2467:
2468: my $useropt = $self->{USER_OPT};
2469: my $courseopt = $self->{COURSE_OPT};
2470: my $parmhash = $self->{PARM_HASH};
2471:
2472: # ---------------------------------------------------------- first, check user
2473: if ($uname and defined($useropt)) {
2474: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2475: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2476: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2477: }
2478:
2479: # ------------------------------------------------------- second, check course
2480: if ($csec and defined($courseopt)) {
2481: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2482: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2483: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2484: }
2485:
2486: if (defined($courseopt)) {
2487: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2488: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2489: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2490: }
2491:
2492: # ----------------------------------------------------- third, check map parms
2493:
2494: my $thisparm=$$parmhash{$symbparm};
2495: if (defined($thisparm)) { return $thisparm; }
2496:
2497: # ----------------------------------------------------- fourth , check default
2498:
2499: my $meta_rwhat=$rwhat;
2500: $meta_rwhat=~s/\./_/g;
2501: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2502: if (defined($default)) { return $default}
2503: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2504: if (defined($default)) { return $default}
2505:
2506: # --------------------------------------------------- fifth , cascade up parts
2507:
2508: my ($space,@qualifier)=split(/\./,$rwhat);
2509: my $qualifier=join('.',@qualifier);
2510: unless ($space eq '0') {
2511: my @parts=split(/_/,$space);
2512: my $id=pop(@parts);
2513: my $part=join('_',@parts);
2514: if ($part eq '') { $part='0'; }
2515: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2516: if (defined($partgeneral)) { return $partgeneral; }
2517: }
2518: if ($recurse) { return undef; }
2519: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2520: if (defined($pack_def)) { return $pack_def; }
2521: return '';
2522: }
2523:
2524: =pod
2525:
2526: =item * B<getResourceByUrl>(url):
2527:
2528: Retrieves a resource object by URL of the resource. If passed a
2529: resource object, it will simply return it, so it is safe to use this
2530: method in code like "$res = $navmap->getResourceByUrl($res)", if
2531: you're not sure if $res is already an object, or just a URL. If the
2532: resource appears multiple times in the course, only the first instance
2533: will be returned. As a result, this is probably useful only for maps.
2534:
2535: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2536:
2537: The map is a specification of a map to retreive the resources from,
2538: either as a url or as an object. The filterFunc is a reference to a
2539: function that takes a resource object as its one argument and returns
2540: true if the resource should be included, or false if it should not
2541: be. If recursive is true, the map will be recursively examined,
2542: otherwise it will not be. If bailout is true, the function will return
2543: as soon as it finds a resource, if false it will finish. By default,
2544: the map is the top-level map of the course, filterFunc is a function
2545: that always returns 1, recursive is true, bailout is false. The
2546: resources will be returned in a list containing the resource objects
2547: for the corresponding resources, with B<no structure information> in
2548: the list; regardless of branching, recursion, etc., it will be a flat
2549: list.
2550:
2551: Thus, this is suitable for cases where you don't want the structure,
2552: just a list of all resources. It is also suitable for finding out how
2553: many resources match a given description; for this use, if all you
2554: want to know is if I<any> resources match the description, the bailout
2555: parameter will allow you to avoid potentially expensive enumeration of
2556: all matching resources.
2557:
2558: =item * B<hasResource>(map, filterFunc, recursive):
2559:
2560: Convience method for
2561:
2562: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2563:
2564: which will tell whether the map has resources matching the description
2565: in the filter function.
2566:
2567: =cut
2568:
2569:
2570: sub getResourceByUrl {
2571: my $self = shift;
2572: my $resUrl = shift;
2573:
2574: if (ref($resUrl)) { return $resUrl; }
2575:
2576: $resUrl = &Apache::lonnet::clutter($resUrl);
2577: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2578: if ($resId =~ /,/) {
2579: $resId = (split (/,/, $resId))[0];
2580: }
2581: if (!$resId) { return ''; }
2582: return $self->getById($resId);
2583: }
2584:
2585: sub retrieveResources {
2586: my $self = shift;
2587: my $map = shift;
2588: my $filterFunc = shift;
2589: if (!defined ($filterFunc)) {
2590: $filterFunc = sub {return 1;};
2591: }
2592: my $recursive = shift;
2593: if (!defined($recursive)) { $recursive = 1; }
2594: my $bailout = shift;
2595: if (!defined($bailout)) { $bailout = 0; }
2596:
2597: # Create the necessary iterator.
2598: if (!ref($map)) { # assume it's a url of a map.
2599: $map = $self->getResourceByUrl($map);
2600: }
2601:
2602: # If nothing was passed, assume top-level map
2603: if (!$map) {
2604: $map = $self->getById('0.0');
2605: }
2606:
2607: # Check the map's validity.
2608: if (!$map->is_map()) {
2609: # Oh, to throw an exception.... how I'd love that!
2610: return ();
2611: }
2612:
2613: # Get an iterator.
2614: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2615: undef, $recursive);
2616:
2617: my @resources = ();
2618:
2619: # Run down the iterator and collect the resources.
2620: my $curRes;
2621:
2622: while ($curRes = $it->next()) {
2623: if (ref($curRes)) {
2624: if (!&$filterFunc($curRes)) {
2625: next;
2626: }
2627:
2628: push @resources, $curRes;
2629:
2630: if ($bailout) {
2631: return @resources;
2632: }
2633: }
2634:
2635: }
2636:
2637: return @resources;
2638: }
2639:
2640: sub hasResource {
2641: my $self = shift;
2642: my $map = shift;
2643: my $filterFunc = shift;
2644: my $recursive = shift;
2645:
2646: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2647: }
2648:
2649: 1;
2650:
2651: package Apache::lonnavmaps::iterator;
2652:
2653: =pod
2654:
2655: =back
2656:
2657: =head1 Object: navmap Iterator
2658:
2659: An I<iterator> encapsulates the logic required to traverse a data
2660: structure. navmap uses an iterator to traverse the course map
2661: according to the criteria you wish to use.
2662:
2663: To obtain an iterator, call the B<getIterator>() function of a
2664: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2665: directly.) This will return a reference to the iterator:
2666:
2667: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2668:
2669: To get the next thing from the iterator, call B<next>:
2670:
2671: C<my $nextThing = $resourceIterator-E<gt>next()>
2672:
2673: getIterator behaves as follows:
2674:
2675: =over 4
2676:
2677: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2678:
2679: All parameters are optional. firstResource is a resource reference
2680: corresponding to where the iterator should start. It defaults to
2681: navmap->firstResource() for the corresponding nav map. finishResource
2682: corresponds to where you want the iterator to end, defaulting to
2683: navmap->finishResource(). filterHash is a hash used as a set
2684: containing strings representing the resource IDs, defaulting to
2685: empty. Condition is a 1 or 0 that sets what to do with the filter
2686: hash: If a 0, then only resources that exist IN the filterHash will be
2687: recursed on. If it is a 1, only resources NOT in the filterHash will
2688: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2689: false (default), the iterator will only return the first level of map
2690: that is not just a single, 'redirecting' map. If true, the iterator
2691: will return all information, starting with the top-level map,
2692: regardless of content. returnTopMap, if true (default false), will
2693: cause the iterator to return the top-level map object (resource 0.0)
2694: before anything else.
2695:
2696: Thus, by default, only top-level resources will be shown. Change the
2697: condition to a 1 without changing the hash, and all resources will be
2698: shown. Changing the condition to 1 and including some values in the
2699: hash will allow you to selectively suppress parts of the navmap, while
2700: leaving it on 0 and adding things to the hash will allow you to
2701: selectively add parts of the nav map. See the handler code for
2702: examples.
2703:
2704: The iterator will return either a reference to a resource object, or a
2705: token representing something in the map, such as the beginning of a
2706: new branch. The possible tokens are:
2707:
2708: =over 4
2709:
2710: =item * B<END_ITERATOR>:
2711:
2712: The iterator has returned all that it's going to. Further calls to the
2713: iterator will just produce more of these. This is a "false" value, and
2714: is the only false value the iterator which will be returned, so it can
2715: be used as a loop sentinel.
2716:
2717: =item * B<BEGIN_MAP>:
2718:
2719: A new map is being recursed into. This is returned I<after> the map
2720: resource itself is returned.
2721:
2722: =item * B<END_MAP>:
2723:
2724: The map is now done.
2725:
2726: =item * B<BEGIN_BRANCH>:
2727:
2728: A branch is now starting. The next resource returned will be the first
2729: in that branch.
2730:
2731: =item * B<END_BRANCH>:
2732:
2733: The branch is now done.
2734:
2735: =back
2736:
2737: The tokens are retreivable via methods on the iterator object, i.e.,
2738: $iterator->END_MAP.
2739:
2740: Maps can contain empty resources. The iterator will automatically skip
2741: over such resources, but will still treat the structure
2742: correctly. Thus, a complicated map with several branches, but
2743: consisting entirely of empty resources except for one beginning or
2744: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2745: but only one resource will be returned.
2746:
2747: =back
2748:
2749: =head2 Normal Usage
2750:
2751: Normal usage of the iterator object is to do the following:
2752:
2753: my $it = $navmap->getIterator([your params here]);
2754: my $curRes;
2755: while ($curRes = $it->next()) {
2756: [your logic here]
2757: }
2758:
2759: Note that inside of the loop, it's frequently useful to check if
2760: "$curRes" is a reference or not with the reference function; only
2761: resource objects will be references, and any non-references will
2762: be the tokens described above.
2763:
2764: Also note there is some old code floating around that trys to track
2765: the depth of the iterator to see when it's done; do not copy that
2766: code. It is difficult to get right and harder to understand then
2767: this. They should be migrated to this new style.
2768:
2769: =cut
2770:
2771: # Here are the tokens for the iterator:
2772:
2773: sub END_ITERATOR { return 0; }
2774: sub BEGIN_MAP { return 1; } # begining of a new map
2775: sub END_MAP { return 2; } # end of the map
2776: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2777: sub END_BRANCH { return 4; } # end of a branch
2778: sub FORWARD { return 1; } # go forward
2779: sub BACKWARD { return 2; }
2780:
2781: sub min {
2782: (my $a, my $b) = @_;
2783: if ($a < $b) { return $a; } else { return $b; }
2784: }
2785:
2786: sub new {
2787: # magic invocation to create a class instance
2788: my $proto = shift;
2789: my $class = ref($proto) || $proto;
2790: my $self = {};
2791:
2792: $self->{NAV_MAP} = shift;
2793: return undef unless ($self->{NAV_MAP});
2794:
2795: # Handle the parameters
2796: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2797: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2798:
2799: # If the given resources are just the ID of the resource, get the
2800: # objects
2801: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2802: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2803: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2804: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2805:
2806: $self->{FILTER} = shift;
2807:
2808: # A hash, used as a set, of resource already seen
2809: $self->{ALREADY_SEEN} = shift;
2810: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2811: $self->{CONDITION} = shift;
2812:
2813: # Do we want to automatically follow "redirection" maps?
2814: $self->{FORCE_TOP} = shift;
2815:
2816: # Do we want to return the top-level map object (resource 0.0)?
2817: $self->{RETURN_0} = shift;
2818: # have we done that yet?
2819: $self->{HAVE_RETURNED_0} = 0;
2820:
2821: # Now, we need to pre-process the map, by walking forward and backward
2822: # over the parts of the map we're going to look at.
2823:
2824: # The processing steps are exactly the same, except for a few small
2825: # changes, so I bundle those up in the following list of two elements:
2826: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2827: # first_resource).
2828: # This prevents writing nearly-identical code twice.
2829: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2830: 'FIRST_RESOURCE'],
2831: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2832: 'FINISH_RESOURCE'] );
2833:
2834: my $maxDepth = 0; # tracks max depth
2835:
2836: # If there is only one resource in this map, and it's a map, we
2837: # want to remember that, so the user can ask for the first map
2838: # that isn't just a redirector.
2839: my $resource; my $resourceCount = 0;
2840:
2841: # Documentation on this algorithm can be found in the CVS repository at
2842: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2843: # in that file.
2844: # **1**
2845:
2846: foreach my $pass (@iterations) {
2847: my $direction = $pass->[0];
2848: my $valName = $pass->[1];
2849: my $nextResourceMethod = $pass->[2];
2850: my $firstResourceName = $pass->[3];
2851:
2852: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2853: $self->{FIRST_RESOURCE},
2854: $self->{FINISH_RESOURCE},
2855: {}, undef, 0, $direction);
2856:
2857: # prime the recursion
2858: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2859: $iterator->next();
2860: my $curRes = $iterator->next();
2861: my $depth = 1;
2862: while ($depth > 0) {
2863: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2864: if ($curRes == $iterator->END_MAP()) { $depth--; }
2865:
2866: if (ref($curRes)) {
2867: # If there's only one resource, this will save it
2868: # we have to filter empty resources from consideration here,
2869: # or even "empty", redirecting maps have two (start & finish)
2870: # or three (start, finish, plus redirector)
2871: if($direction == FORWARD && $curRes->src()) {
2872: $resource = $curRes; $resourceCount++;
2873: }
2874: my $resultingVal = $curRes->{DATA}->{$valName};
2875: my $nextResources = $curRes->$nextResourceMethod();
2876: my $nextCount = scalar(@{$nextResources});
2877:
2878: if ($nextCount == 1) { # **3**
2879: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2880: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2881: }
2882:
2883: if ($nextCount > 1) { # **4**
2884: foreach my $res (@{$nextResources}) {
2885: my $current = $res->{DATA}->{$valName} || 999999999;
2886: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2887: }
2888: }
2889: }
2890:
2891: # Assign the final val (**2**)
2892: if (ref($curRes) && $direction == BACKWARD()) {
2893: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2894: $curRes->{DATA}->{BOT_UP_VAL});
2895:
2896: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2897: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2898: }
2899:
2900: $curRes = $iterator->next();
2901: }
2902: }
2903:
2904: # Check: Was this only one resource, a map?
2905: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2906: my $firstResource = $resource->map_start();
2907: my $finishResource = $resource->map_finish();
2908: return
2909: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2910: $finishResource, $self->{FILTER},
2911: $self->{ALREADY_SEEN},
2912: $self->{CONDITION}, 0);
2913:
2914: }
2915:
2916: # Set up some bookkeeping information.
2917: $self->{CURRENT_DEPTH} = 0;
2918: $self->{MAX_DEPTH} = $maxDepth;
2919: $self->{STACK} = [];
2920: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2921: $self->{FINISHED} = 0; # When true, the iterator has finished
2922:
2923: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2924: push @{$self->{STACK}}, [];
2925: }
2926:
2927: # Prime the recursion w/ the first resource **5**
2928: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2929: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2930:
2931: bless ($self);
2932:
2933: return $self;
2934: }
2935:
2936: sub next {
2937: my $self = shift;
2938: my $closeAllPages=shift;
2939: if ($self->{FINISHED}) {
2940: return END_ITERATOR();
2941: }
2942:
2943: # If we want to return the top-level map object, and haven't yet,
2944: # do so.
2945: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2946: $self->{HAVE_RETURNED_0} = 1;
2947: return $self->{NAV_MAP}->getById('0.0');
2948: }
2949:
2950: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2951: # grab the next from the recursive iterator
2952: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2953:
2954: # is it a begin or end map? If so, update the depth
2955: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2956: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2957:
2958: # Are we back at depth 0? If so, stop recursing
2959: if ($self->{RECURSIVE_DEPTH} == 0) {
2960: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2961: }
2962:
2963: return $next;
2964: }
2965:
2966: if (defined($self->{FORCE_NEXT})) {
2967: my $tmp = $self->{FORCE_NEXT};
2968: $self->{FORCE_NEXT} = undef;
2969: return $tmp;
2970: }
2971:
2972: # Have we not yet begun? If not, return BEGIN_MAP and
2973: # remember we've started.
2974: if ( !$self->{STARTED} ) {
2975: $self->{STARTED} = 1;
2976: return $self->BEGIN_MAP();
2977: }
2978:
2979: # Here's the guts of the iterator.
2980:
2981: # Find the next resource, if any.
2982: my $found = 0;
2983: my $i = $self->{MAX_DEPTH};
2984: my $newDepth;
2985: my $here;
2986: while ( $i >= 0 && !$found ) {
2987: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2988: $here = pop @{$self->{STACK}->[$i]}; # **7**
2989: $found = 1;
2990: $newDepth = $i;
2991: }
2992: $i--;
2993: }
2994:
2995: # If we still didn't find anything, we're done.
2996: if ( !$found ) {
2997: # We need to get back down to the correct branch depth
2998: if ( $self->{CURRENT_DEPTH} > 0 ) {
2999: $self->{CURRENT_DEPTH}--;
3000: return END_BRANCH();
3001: } else {
3002: $self->{FINISHED} = 1;
3003: return END_MAP();
3004: }
3005: }
3006:
3007: # If this is not a resource, it must be an END_BRANCH marker we want
3008: # to return directly.
3009: if (!ref($here)) { # **8**
3010: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3011: $self->{CURRENT_DEPTH}--;
3012: return $here;
3013: }
3014: }
3015:
3016: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3017: $self->{HERE} = $here;
3018:
3019: # Get to the right level
3020: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3021: push @{$self->{STACK}->[$newDepth]}, $here;
3022: $self->{CURRENT_DEPTH}--;
3023: return END_BRANCH();
3024: }
3025: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3026: push @{$self->{STACK}->[$newDepth]}, $here;
3027: $self->{CURRENT_DEPTH}++;
3028: return BEGIN_BRANCH();
3029: }
3030:
3031: # If we made it here, we have the next resource, and we're at the
3032: # right branch level. So let's examine the resource for where
3033: # we can get to from here.
3034:
3035: # So we need to look at all the resources we can get to from here,
3036: # categorize them if we haven't seen them, remember if we have a new
3037: my $nextUnfiltered = $here->getNext();
3038: my $maxDepthAdded = -1;
3039:
3040: for (@$nextUnfiltered) {
3041: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3042: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3043: push @{$self->{STACK}->[$depth]}, $_;
3044: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3045: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3046: }
3047: }
3048:
3049: # Is this the end of a branch? If so, all of the resources examined above
3050: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3051: # marker onto the stack so we don't forget.
3052: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3053: # BC branch and gets to C, it will see F as the only next resource, but it's
3054: # one level lower. Thus, this is the end of the branch, since there are no
3055: # more resources added to this level or above.
3056: # We don't do this if the examined resource is the finish resource,
3057: # because the condition given above is true, but the "END_MAP" will
3058: # take care of things and we should already be at depth 0.
3059: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3060: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3061: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3062: }
3063:
3064: # That ends the main iterator logic. Now, do we want to recurse
3065: # down this map (if this resource is a map)?
3066: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3067: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3068: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3069: my $firstResource = $self->{HERE}->map_start();
3070: my $finishResource = $self->{HERE}->map_finish();
3071:
3072: $self->{RECURSIVE_ITERATOR} =
3073: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3074: $finishResource, $self->{FILTER},
3075: $self->{ALREADY_SEEN}, $self->{CONDITION});
3076: }
3077:
3078: # If this is a blank resource, don't actually return it.
3079: # Should you ever find you need it, make sure to add an option to the code
3080: # that you can use; other things depend on this behavior.
3081: my $browsePriv = $self->{HERE}->browsePriv();
3082: if (!$self->{HERE}->src() ||
3083: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3084: return $self->next($closeAllPages);
3085: }
3086:
3087: return $self->{HERE};
3088:
3089: }
3090:
3091: =pod
3092:
3093: The other method available on the iterator is B<getStack>, which
3094: returns an array populated with the current 'stack' of maps, as
3095: references to the resource objects. Example: This is useful when
3096: making the navigation map, as we need to check whether we are under a
3097: page map to see if we need to link directly to the resource, or to the
3098: page. The first elements in the array will correspond to the top of
3099: the stack (most inclusive map).
3100:
3101: =cut
3102:
3103: sub getStack {
3104: my $self=shift;
3105:
3106: my @stack;
3107:
3108: $self->populateStack(\@stack);
3109:
3110: return \@stack;
3111: }
3112:
3113: # Private method: Calls the iterators recursively to populate the stack.
3114: sub populateStack {
3115: my $self=shift;
3116: my $stack = shift;
3117:
3118: push @$stack, $self->{HERE} if ($self->{HERE});
3119:
3120: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3121: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3122: }
3123: }
3124:
3125: 1;
3126:
3127: package Apache::lonnavmaps::DFSiterator;
3128:
3129: # Not documented in the perldoc: This is a simple iterator that just walks
3130: # through the nav map and presents the resources in a depth-first search
3131: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3132: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3133: # useful for pre-processing of some kind, and is in fact used by the main
3134: # iterator that way, but that's about it.
3135: # One could imagine merging this into the init routine of the main iterator,
3136: # but this might as well be left separate, since it is possible some other
3137: # use might be found for it. - Jeremy
3138:
3139: # Unlike the main iterator, this DOES return all resources, even blank ones.
3140: # The main iterator needs them to correctly preprocess the map.
3141:
3142: sub BEGIN_MAP { return 1; } # begining of a new map
3143: sub END_MAP { return 2; } # end of the map
3144: sub FORWARD { return 1; } # go forward
3145: sub BACKWARD { return 2; }
3146:
3147: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3148: # filter hash ref (or undef), already seen hash or undef, condition
3149: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3150: sub new {
3151: # magic invocation to create a class instance
3152: my $proto = shift;
3153: my $class = ref($proto) || $proto;
3154: my $self = {};
3155:
3156: $self->{NAV_MAP} = shift;
3157: return undef unless ($self->{NAV_MAP});
3158:
3159: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3160: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3161:
3162: # If the given resources are just the ID of the resource, get the
3163: # objects
3164: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3165: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3166: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3167: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3168:
3169: $self->{FILTER} = shift;
3170:
3171: # A hash, used as a set, of resource already seen
3172: $self->{ALREADY_SEEN} = shift;
3173: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3174: $self->{CONDITION} = shift;
3175: $self->{DIRECTION} = shift || FORWARD();
3176:
3177: # Flag: Have we started yet?
3178: $self->{STARTED} = 0;
3179:
3180: # Should we continue calling the recursive iterator, if any?
3181: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3182: # The recursive iterator, if any
3183: $self->{RECURSIVE_ITERATOR} = undef;
3184: # Are we recursing on a map, or a branch?
3185: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3186: # And the count of how deep it is, so that this iterator can keep track of
3187: # when to pick back up again.
3188: $self->{RECURSIVE_DEPTH} = 0;
3189:
3190: # For keeping track of our branches, we maintain our own stack
3191: $self->{STACK} = [];
3192:
3193: # Start with the first resource
3194: if ($self->{DIRECTION} == FORWARD) {
3195: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3196: } else {
3197: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3198: }
3199:
3200: bless($self);
3201: return $self;
3202: }
3203:
3204: sub next {
3205: my $self = shift;
3206:
3207: # Are we using a recursive iterator? If so, pull from that and
3208: # watch the depth; we want to resume our level at the correct time.
3209: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3210: # grab the next from the recursive iterator
3211: my $next = $self->{RECURSIVE_ITERATOR}->next();
3212:
3213: # is it a begin or end map? Update depth if so
3214: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3215: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3216:
3217: # Are we back at depth 0? If so, stop recursing.
3218: if ($self->{RECURSIVE_DEPTH} == 0) {
3219: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3220: }
3221:
3222: return $next;
3223: }
3224:
3225: # Is there a current resource to grab? If not, then return
3226: # END_MAP, which will end the iterator.
3227: if (scalar(@{$self->{STACK}}) == 0) {
3228: return $self->END_MAP();
3229: }
3230:
3231: # Have we not yet begun? If not, return BEGIN_MAP and
3232: # remember that we've started.
3233: if ( !$self->{STARTED} ) {
3234: $self->{STARTED} = 1;
3235: return $self->BEGIN_MAP;
3236: }
3237:
3238: # Get the next resource in the branch
3239: $self->{HERE} = pop @{$self->{STACK}};
3240:
3241: # remember that we've seen this, so we don't return it again later
3242: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3243:
3244: # Get the next possible resources
3245: my $nextUnfiltered;
3246: if ($self->{DIRECTION} == FORWARD()) {
3247: $nextUnfiltered = $self->{HERE}->getNext();
3248: } else {
3249: $nextUnfiltered = $self->{HERE}->getPrevious();
3250: }
3251: my $next = [];
3252:
3253: # filter the next possibilities to remove things we've
3254: # already seen.
3255: foreach (@$nextUnfiltered) {
3256: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3257: push @$next, $_;
3258: }
3259: }
3260:
3261: while (@$next) {
3262: # copy the next possibilities over to the stack
3263: push @{$self->{STACK}}, shift @$next;
3264: }
3265:
3266: # If this is a map and we want to recurse down it... (not filtered out)
3267: if ($self->{HERE}->is_map() &&
3268: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3269: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3270: my $firstResource = $self->{HERE}->map_start();
3271: my $finishResource = $self->{HERE}->map_finish();
3272:
3273: $self->{RECURSIVE_ITERATOR} =
3274: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3275: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3276: $self->{CONDITION}, $self->{DIRECTION});
3277: }
3278:
3279: return $self->{HERE};
3280: }
3281:
3282: # Identical to the full iterator methods of the same name. Hate to copy/paste
3283: # but I also hate to "inherit" either iterator from the other.
3284:
3285: sub getStack {
3286: my $self=shift;
3287:
3288: my @stack;
3289:
3290: $self->populateStack(\@stack);
3291:
3292: return \@stack;
3293: }
3294:
3295: # Private method: Calls the iterators recursively to populate the stack.
3296: sub populateStack {
3297: my $self=shift;
3298: my $stack = shift;
3299:
3300: push @$stack, $self->{HERE} if ($self->{HERE});
3301:
3302: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3303: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3304: }
3305: }
3306:
3307: 1;
3308:
3309: package Apache::lonnavmaps::resource;
3310:
3311: use Apache::lonnet;
3312:
3313: =pod
3314:
3315: =head1 Object: resource
3316:
3317: X<resource, navmap object>
3318: A resource object encapsulates a resource in a resource map, allowing
3319: easy manipulation of the resource, querying the properties of the
3320: resource (including user properties), and represents a reference that
3321: can be used as the canonical representation of the resource by
3322: lonnavmap clients like renderers.
3323:
3324: A resource only makes sense in the context of a navmap, as some of the
3325: data is stored in the navmap object.
3326:
3327: You will probably never need to instantiate this object directly. Use
3328: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3329: starting resource.
3330:
3331: Resource objects respect the parameter_hiddenparts, which suppresses
3332: various parts according to the wishes of the map author. As of this
3333: writing, there is no way to override this parameter, and suppressed
3334: parts will never be returned, nor will their response types or ids be
3335: stored.
3336:
3337: =head2 Overview
3338:
3339: A B<Resource> is the most granular type of object in LON-CAPA that can
3340: be included in a course. It can either be a particular resource, like
3341: an HTML page, external resource, problem, etc., or it can be a
3342: container sequence, such as a "page" or a "map".
3343:
3344: To see a sequence from the user's point of view, please see the
3345: B<Creating a Course: Maps and Sequences> chapter of the Author's
3346: Manual.
3347:
3348: A Resource Object, once obtained from a navmap object via a B<getBy*>
3349: method of the navmap, or from an iterator, allows you to query
3350: information about that resource.
3351:
3352: Generally, you do not ever want to create a resource object yourself,
3353: so creation has been left undocumented. Always retrieve resources
3354: from navmap objects.
3355:
3356: =head3 Identifying Resources
3357:
3358: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3359: unique to that resource for a given course. X<resource ID, in big hash>
3360: The Resource ID has the form #.#, where the first number is the same
3361: for every resource in a map, and the second is unique. For instance,
3362: for a course laid out like this:
3363:
3364: * Problem 1
3365: * Map
3366: * Resource 2
3367: * Resource 3
3368:
3369: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3370: C<Resource 3> will share a first number. The second number may end up
3371: re-used between the two groups.
3372:
3373: The resource ID is only used in the big hash, but can be used in the
3374: context of a course to identify a resource easily. (For instance, the
3375: printing system uses it to record which resources from a sequence you
3376: wish to print.)
3377:
3378: X<symb> X<resource, symb>
3379: All resources also have B<symb>s, which uniquely identify a resource
3380: in a course. Many internal LON-CAPA functions expect a symb. A symb
3381: carries along with it the URL of the resource, and the map it appears
3382: in. Symbs are much larger then resource IDs.
3383:
3384: =cut
3385:
3386: sub new {
3387: # magic invocation to create a class instance
3388: my $proto = shift;
3389: my $class = ref($proto) || $proto;
3390: my $self = {};
3391:
3392: $self->{NAV_MAP} = shift;
3393: $self->{ID} = shift;
3394:
3395: # Store this new resource in the parent nav map's cache.
3396: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3397: $self->{RESOURCE_ERROR} = 0;
3398:
3399: # A hash that can be used by two-pass algorithms to store data
3400: # about this resource in. Not used by the resource object
3401: # directly.
3402: $self->{DATA} = {};
3403:
3404: bless($self);
3405:
3406: return $self;
3407: }
3408:
3409: # private function: simplify the NAV_HASH lookups we keep doing
3410: # pass the name, and to automatically append my ID, pass a true val on the
3411: # second param
3412: sub navHash {
3413: my $self = shift;
3414: my $param = shift;
3415: my $id = shift;
3416: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3417: }
3418:
3419: =pod
3420:
3421: =head2 Methods
3422:
3423: Once you have a resource object, here's what you can do with it:
3424:
3425: =head3 Attribute Retrieval
3426:
3427: Every resource has certain attributes that can be retrieved and used:
3428:
3429: =over 4
3430:
3431: =item * B<ID>: Every resource has an ID that is unique for that
3432: resource in the course it is in. The ID is actually in the hash
3433: representing the resource, so for a resource object $res, obtain
3434: it via C<$res->{ID}).
3435:
3436: =item * B<compTitle>:
3437:
3438: Returns a "composite title", that is equal to $res->title() if the
3439: resource has a title, and is otherwise the last part of the URL (e.g.,
3440: "problem.problem").
3441:
3442: =item * B<ext>:
3443:
3444: Returns true if the resource is external.
3445:
3446: =item * B<kind>:
3447:
3448: Returns the kind of the resource from the compiled nav map.
3449:
3450: =item * B<randomout>:
3451:
3452: Returns true if this resource was chosen to NOT be shown to the user
3453: by the random map selection feature. In other words, this is usually
3454: false.
3455:
3456: =item * B<randompick>:
3457:
3458: Returns true for a map if the randompick feature is being used on the
3459: map. (?)
3460:
3461: =item * B<src>:
3462:
3463: Returns the source for the resource.
3464:
3465: =item * B<symb>:
3466:
3467: Returns the symb for the resource.
3468:
3469: =item * B<title>:
3470:
3471: Returns the title of the resource.
3472:
3473: =back
3474:
3475: =cut
3476:
3477: # These info functions can be used directly, as they don't return
3478: # resource information.
3479: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3480: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3481: sub from { my $self=shift; return $self->navHash("from_", 1); }
3482: # considered private and undocumented
3483: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3484: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3485: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3486: sub randompick {
3487: my $self = shift;
3488: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3489: '.0.parameter_randompick'};
3490: }
3491: sub src {
3492: my $self=shift;
3493: return $self->navHash("src_", 1);
3494: }
3495: sub symb {
3496: my $self=shift;
3497: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3498: my $symbSrc = &Apache::lonnet::declutter($self->src());
3499: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3500: . '___' . $second . '___' . $symbSrc;
3501: return &Apache::lonnet::symbclean($symb);
3502: }
3503: sub title {
3504: my $self=shift;
3505: if ($self->{ID} eq '0.0') {
3506: # If this is the top-level map, return the title of the course
3507: # since this map can not be titled otherwise.
3508: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3509: }
3510: return $self->navHash("title_", 1); }
3511: # considered private and undocumented
3512: sub to { my $self=shift; return $self->navHash("to_", 1); }
3513: sub compTitle {
3514: my $self = shift;
3515: my $title = $self->title();
3516: $title=~s/\&colon\;/\:/gs;
3517: if (!$title) {
3518: $title = $self->src();
3519: $title = substr($title, rindex($title, '/') + 1);
3520: }
3521: return $title;
3522: }
3523: =pod
3524:
3525: B<Predicate Testing the Resource>
3526:
3527: These methods are shortcuts to deciding if a given resource has a given property.
3528:
3529: =over 4
3530:
3531: =item * B<is_map>:
3532:
3533: Returns true if the resource is a map type.
3534:
3535: =item * B<is_problem>:
3536:
3537: Returns true if the resource is a problem type, false
3538: otherwise. (Looks at the extension on the src field; might need more
3539: to work correctly.)
3540:
3541: =item * B<is_page>:
3542:
3543: Returns true if the resource is a page.
3544:
3545: =item * B<is_sequence>:
3546:
3547: Returns true if the resource is a sequence.
3548:
3549: =back
3550:
3551: =cut
3552:
3553: sub hasResource {
3554: my $self = shift;
3555: return $self->{NAV_MAP}->hasResource(@_);
3556: }
3557:
3558: sub retrieveResources {
3559: my $self = shift;
3560: return $self->{NAV_MAP}->retrieveResources(@_);
3561: }
3562:
3563: sub is_html {
3564: my $self=shift;
3565: my $src = $self->src();
3566: return ($src =~ /html$/);
3567: }
3568: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3569: sub is_page {
3570: my $self=shift;
3571: my $src = $self->src();
3572: return $self->navHash("is_map_", 1) &&
3573: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3574: }
3575: sub is_problem {
3576: my $self=shift;
3577: my $src = $self->src();
3578: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3579: }
3580: sub contains_problem {
3581: my $self=shift;
3582: if ($self->is_page()) {
3583: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3584: return $hasProblem;
3585: }
3586: return 0;
3587: }
3588: sub is_sequence {
3589: my $self=shift;
3590: my $src = $self->src();
3591: return $self->navHash("is_map_", 1) &&
3592: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3593: }
3594: sub is_survey {
3595: my $self = shift();
3596: my $part = shift();
3597: if ($self->parmval('type',$part) eq 'survey') {
3598: return 1;
3599: }
3600: if ($self->src() =~ /\.(survey)$/) {
3601: return 1;
3602: }
3603: return 0;
3604: }
3605:
3606: sub is_empty_sequence {
3607: my $self=shift;
3608: my $src = $self->src();
3609: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3610: }
3611:
3612: # Private method: Shells out to the parmval in the nav map, handler parts.
3613: sub parmval {
3614: my $self = shift;
3615: my $what = shift;
3616: my $part = shift;
3617: if (!defined($part)) {
3618: $part = '0';
3619: }
3620: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3621: }
3622:
3623: =pod
3624:
3625: B<Map Methods>
3626:
3627: These methods are useful for getting information about the map
3628: properties of the resource, if the resource is a map (B<is_map>).
3629:
3630: =over 4
3631:
3632: =item * B<map_finish>:
3633:
3634: Returns a reference to a resource object corresponding to the finish
3635: resource of the map.
3636:
3637: =item * B<map_pc>:
3638:
3639: Returns the pc value of the map, which is the first number that
3640: appears in the resource ID of the resources in the map, and is the
3641: number that appears around the middle of the symbs of the resources in
3642: that map.
3643:
3644: =item * B<map_start>:
3645:
3646: Returns a reference to a resource object corresponding to the start
3647: resource of the map.
3648:
3649: =item * B<map_type>:
3650:
3651: Returns a string with the type of the map in it.
3652:
3653: =back
3654:
3655: =cut
3656:
3657: sub map_finish {
3658: my $self = shift;
3659: my $src = $self->src();
3660: $src = Apache::lonnet::clutter($src);
3661: my $res = $self->navHash("map_finish_$src", 0);
3662: $res = $self->{NAV_MAP}->getById($res);
3663: return $res;
3664: }
3665: sub map_pc {
3666: my $self = shift;
3667: my $src = $self->src();
3668: return $self->navHash("map_pc_$src", 0);
3669: }
3670: sub map_start {
3671: my $self = shift;
3672: my $src = $self->src();
3673: $src = Apache::lonnet::clutter($src);
3674: my $res = $self->navHash("map_start_$src", 0);
3675: $res = $self->{NAV_MAP}->getById($res);
3676: return $res;
3677: }
3678: sub map_type {
3679: my $self = shift;
3680: my $pc = $self->map_pc();
3681: return $self->navHash("map_type_$pc", 0);
3682: }
3683:
3684: #####
3685: # Property queries
3686: #####
3687:
3688: # These functions will be responsible for returning the CORRECT
3689: # VALUE for the parameter, no matter what. So while they may look
3690: # like direct calls to parmval, they can be more then that.
3691: # So, for instance, the duedate function should use the "duedatetype"
3692: # information, rather then the resource object user.
3693:
3694: =pod
3695:
3696: =head2 Resource Parameters
3697:
3698: In order to use the resource parameters correctly, the nav map must
3699: have been instantiated with genCourseAndUserOptions set to true, so
3700: the courseopt and useropt is read correctly. Then, you can call these
3701: functions to get the relevant parameters for the resource. Each
3702: function defaults to part "0", but can be directed to another part by
3703: passing the part as the parameter.
3704:
3705: These methods are responsible for getting the parameter correct, not
3706: merely reflecting the contents of the GDBM hashes. As we move towards
3707: dates relative to other dates, these methods should be updated to
3708: reflect that. (Then, anybody using these methods will not have to update
3709: their code.)
3710:
3711: =over 4
3712:
3713: =item * B<acc>:
3714:
3715: Get the Client IP/Name Access Control information.
3716:
3717: =item * B<answerdate>:
3718:
3719: Get the answer-reveal date for the problem.
3720:
3721: =item * B<awarded>:
3722:
3723: Gets the awarded value for the problem part. Requires genUserData set to
3724: true when the navmap object was created.
3725:
3726: =item * B<duedate>:
3727:
3728: Get the due date for the problem.
3729:
3730: =item * B<tries>:
3731:
3732: Get the number of tries the student has used on the problem.
3733:
3734: =item * B<maxtries>:
3735:
3736: Get the number of max tries allowed.
3737:
3738: =item * B<opendate>:
3739:
3740: Get the open date for the problem.
3741:
3742: =item * B<sig>:
3743:
3744: Get the significant figures setting.
3745:
3746: =item * B<tol>:
3747:
3748: Get the tolerance for the problem.
3749:
3750: =item * B<tries>:
3751:
3752: Get the number of tries the user has already used on the problem.
3753:
3754: =item * B<type>:
3755:
3756: Get the question type for the problem.
3757:
3758: =item * B<weight>:
3759:
3760: Get the weight for the problem.
3761:
3762: =back
3763:
3764: =cut
3765:
3766: sub acc {
3767: (my $self, my $part) = @_;
3768: return $self->parmval("acc", $part);
3769: }
3770: sub answerdate {
3771: (my $self, my $part) = @_;
3772: # Handle intervals
3773: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3774: return $self->duedate($part) +
3775: $self->parmval("answerdate", $part);
3776: }
3777: return $self->parmval("answerdate", $part);
3778: }
3779: sub awarded {
3780: my $self = shift; my $part = shift;
3781: $self->{NAV_MAP}->get_user_data();
3782: if (!defined($part)) { $part = '0'; }
3783: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3784: }
3785: sub duedate {
3786: (my $self, my $part) = @_;
3787: my $interval=$self->parmval("interval", $part);
3788: if ($interval) {
3789: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3790: if ($first_access) { return ($first_access+$interval); }
3791: }
3792: return $self->parmval("duedate", $part);
3793: }
3794: sub maxtries {
3795: (my $self, my $part) = @_;
3796: return $self->parmval("maxtries", $part);
3797: }
3798: sub opendate {
3799: (my $self, my $part) = @_;
3800: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3801: return $self->duedate($part) -
3802: $self->parmval("opendate", $part);
3803: }
3804: return $self->parmval("opendate");
3805: }
3806: sub problemstatus {
3807: (my $self, my $part) = @_;
3808: return lc $self->parmval("problemstatus", $part);
3809: }
3810: sub sig {
3811: (my $self, my $part) = @_;
3812: return $self->parmval("sig", $part);
3813: }
3814: sub tol {
3815: (my $self, my $part) = @_;
3816: return $self->parmval("tol", $part);
3817: }
3818: sub tries {
3819: my $self = shift;
3820: my $tries = $self->queryRestoreHash('tries', shift);
3821: if (!defined($tries)) { return '0';}
3822: return $tries;
3823: }
3824: sub type {
3825: (my $self, my $part) = @_;
3826: return $self->parmval("type", $part);
3827: }
3828: sub weight {
3829: my $self = shift; my $part = shift;
3830: if (!defined($part)) { $part = '0'; }
3831: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3832: $self->symb(), $ENV{'user.domain'},
3833: $ENV{'user.name'},
3834: $ENV{'request.course.sec'});
3835: }
3836: sub part_display {
3837: my $self= shift(); my $partID = shift();
3838: if (! defined($partID)) { $partID = '0'; }
3839: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3840: $self->symb);
3841: if (! defined($display) || $display eq '') {
3842: $display = $partID;
3843: }
3844: return $display;
3845: }
3846:
3847: # Multiple things need this
3848: sub getReturnHash {
3849: my $self = shift;
3850:
3851: if (!defined($self->{RETURN_HASH})) {
3852: my %tmpHash = &Apache::lonnet::restore($self->symb());
3853: $self->{RETURN_HASH} = \%tmpHash;
3854: }
3855: }
3856:
3857: ######
3858: # Status queries
3859: ######
3860:
3861: # These methods query the status of problems.
3862:
3863: # If we need to count parts, this function determines the number of
3864: # parts from the metadata. When called, it returns a reference to a list
3865: # of strings corresponding to the parts. (Thus, using it in a scalar context
3866: # tells you how many parts you have in the problem:
3867: # $partcount = scalar($resource->countParts());
3868: # Don't use $self->{PARTS} directly because you don't know if it's been
3869: # computed yet.
3870:
3871: =pod
3872:
3873: =head2 Resource misc
3874:
3875: Misc. functions for the resource.
3876:
3877: =over 4
3878:
3879: =item * B<hasDiscussion>:
3880:
3881: Returns a false value if there has been discussion since the user last
3882: logged in, true if there has. Always returns false if the discussion
3883: data was not extracted when the nav map was constructed.
3884:
3885: =item * B<getFeedback>:
3886:
3887: Gets the feedback for the resource and returns the raw feedback string
3888: for the resource, or the null string if there is no feedback or the
3889: email data was not extracted when the nav map was constructed. Usually
3890: used like this:
3891:
3892: for (split(/\,/, $res->getFeedback())) {
3893: my $link = &Apache::lonnet::escape($_);
3894: ...
3895:
3896: and use the link as appropriate.
3897:
3898: =cut
3899:
3900: sub hasDiscussion {
3901: my $self = shift;
3902: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3903: }
3904:
3905: sub getFeedback {
3906: my $self = shift;
3907: my $source = $self->src();
3908: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3909: return $self->{NAV_MAP}->getFeedback($source);
3910: }
3911:
3912: sub getErrors {
3913: my $self = shift;
3914: my $source = $self->src();
3915: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3916: return $self->{NAV_MAP}->getErrors($source);
3917: }
3918:
3919: =pod
3920:
3921: =item * B<parts>():
3922:
3923: Returns a list reference containing sorted strings corresponding to
3924: each part of the problem. Single part problems have only a part '0'.
3925: Multipart problems do not return their part '0', since they typically
3926: do not really matter.
3927:
3928: =item * B<countParts>():
3929:
3930: Returns the number of parts of the problem a student can answer. Thus,
3931: for single part problems, returns 1. For multipart, it returns the
3932: number of parts in the problem, not including psuedo-part 0.
3933:
3934: =item * B<countResponses>():
3935:
3936: Returns the total number of responses in the problem a student can answer.
3937:
3938: =item * B<responseTypes>():
3939:
3940: Returns a hash whose keys are the response types. The values are the number
3941: of times each response type is used. This is for the I<entire> problem, not
3942: just a single part.
3943:
3944: =item * B<multipart>():
3945:
3946: Returns true if the problem is multipart, false otherwise. Use this instead
3947: of countParts if all you want is multipart/not multipart.
3948:
3949: =item * B<responseType>($part):
3950:
3951: Returns the response type of the part, without the word "response" on the
3952: end. Example return values: 'string', 'essay', 'numeric', etc.
3953:
3954: =item * B<responseIds>($part):
3955:
3956: Retreives the response IDs for the given part as an array reference containing
3957: strings naming the response IDs. This may be empty.
3958:
3959: =back
3960:
3961: =cut
3962:
3963: sub parts {
3964: my $self = shift;
3965:
3966: if ($self->ext) { return []; }
3967:
3968: $self->extractParts();
3969: return $self->{PARTS};
3970: }
3971:
3972: sub countParts {
3973: my $self = shift;
3974:
3975: my $parts = $self->parts();
3976:
3977: # If I left this here, then it's not necessary.
3978: #my $delta = 0;
3979: #for my $part (@$parts) {
3980: # if ($part eq '0') { $delta--; }
3981: #}
3982:
3983: if ($self->{RESOURCE_ERROR}) {
3984: return 0;
3985: }
3986:
3987: return scalar(@{$parts}); # + $delta;
3988: }
3989:
3990: sub countResponses {
3991: my $self = shift;
3992: my $count;
3993: foreach my $part (@{$self->parts()}) {
3994: $count+= scalar($self->responseIds($part));
3995: }
3996: return $count;
3997: }
3998:
3999: sub responseTypes {
4000: my $self = shift;
4001: my %responses;
4002: foreach my $part ($self->parts()) {
4003: foreach my $responsetype ($self->responseType($part)) {
4004: $responses{$responsetype}++ if (defined($responsetype));
4005: }
4006: }
4007: return %responses;
4008: }
4009:
4010: sub multipart {
4011: my $self = shift;
4012: return $self->countParts() > 1;
4013: }
4014:
4015: sub singlepart {
4016: my $self = shift;
4017: return $self->countParts() == 1;
4018: }
4019:
4020: sub responseType {
4021: my $self = shift;
4022: my $part = shift;
4023:
4024: $self->extractParts();
4025: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4026: return @{$self->{RESPONSE_TYPES}->{$part}};
4027: } else {
4028: return undef;
4029: }
4030: }
4031:
4032: sub responseIds {
4033: my $self = shift;
4034: my $part = shift;
4035:
4036: $self->extractParts();
4037: if (defined($self->{RESPONSE_IDS}->{$part})) {
4038: return @{$self->{RESPONSE_IDS}->{$part}};
4039: } else {
4040: return undef;
4041: }
4042: }
4043:
4044: # Private function: Extracts the parts information, both part names and
4045: # part types, and saves it.
4046: sub extractParts {
4047: my $self = shift;
4048:
4049: return if (defined($self->{PARTS}));
4050: return if ($self->ext);
4051:
4052: $self->{PARTS} = [];
4053:
4054: my %parts;
4055:
4056: # Retrieve part count, if this is a problem
4057: if ($self->is_problem()) {
4058: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4059: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4060:
4061: if ($partorder) {
4062: my @parts;
4063: for my $part (split (/,/,$partorder)) {
4064: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4065: push @parts, $part;
4066: $parts{$part} = 1;
4067: }
4068: }
4069: $self->{PARTS} = \@parts;
4070: } else {
4071: if (!$metadata) {
4072: $self->{RESOURCE_ERROR} = 1;
4073: $self->{PARTS} = [];
4074: $self->{PART_TYPE} = {};
4075: return;
4076: }
4077: foreach (split(/\,/,$metadata)) {
4078: if ($_ =~ /^part_(.*)$/) {
4079: my $part = $1;
4080: # This floods the logs if it blows up
4081: if (defined($parts{$part})) {
4082: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4083: }
4084:
4085: # check to see if part is turned off.
4086:
4087: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4088: $parts{$part} = 1;
4089: }
4090: }
4091: }
4092: my @sortedParts = sort keys %parts;
4093: $self->{PARTS} = \@sortedParts;
4094: }
4095:
4096:
4097: # These hashes probably do not need names that end with "Hash"....
4098: my %responseIdHash;
4099: my %responseTypeHash;
4100:
4101:
4102: # Init the responseIdHash
4103: foreach (@{$self->{PARTS}}) {
4104: $responseIdHash{$_} = [];
4105: }
4106:
4107: # Now, the unfortunate thing about this is that parts, part name, and
4108: # response id are delimited by underscores, but both the part
4109: # name and response id can themselves have underscores in them.
4110: # So we have to use our knowlege of part names to figure out
4111: # where the part names begin and end, and even then, it is possible
4112: # to construct ambiguous situations.
4113: foreach (split /,/, $metadata) {
4114: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4115: my $responseType = $1;
4116: my $partStuff = $2;
4117: my $partIdSoFar = '';
4118: my @partChunks = split /_/, $partStuff;
4119: my $i = 0;
4120: for ($i = 0; $i < scalar(@partChunks); $i++) {
4121: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4122: $partIdSoFar .= $partChunks[$i];
4123: if ($parts{$partIdSoFar}) {
4124: my @otherChunks = @partChunks[$i+1..$#partChunks];
4125: my $responseId = join('_', @otherChunks);
4126: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4127: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4128: }
4129: }
4130: }
4131: }
4132: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4133: #
4134: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4135: if ($resorder) {
4136: my @resorder=split(/,/,$resorder);
4137: foreach my $part (keys(%responseIdHash)) {
4138: my $i=0;
4139: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4140: my @neworder;
4141: foreach my $possibleid (@resorder) {
4142: if (exists($resids{$possibleid})) {
4143: push(@neworder,$resids{$possibleid});
4144: }
4145: }
4146: my @ids;
4147: my @type;
4148: foreach my $element (@neworder) {
4149: push (@ids,$responseIdHash{$part}->[$element]);
4150: push (@type,$responseTypeHash{$part}->[$element]);
4151: }
4152: $responseIdHash{$part}=\@ids;
4153: $responseTypeHash{$part}=\@type;
4154: }
4155: }
4156: $self->{RESPONSE_IDS} = \%responseIdHash;
4157: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4158: }
4159:
4160: return;
4161: }
4162:
4163: =pod
4164:
4165: =head2 Resource Status
4166:
4167: Problem resources have status information, reflecting their various
4168: dates and completion statuses.
4169:
4170: There are two aspects to the status: the date-related information and
4171: the completion information.
4172:
4173: Idiomatic usage of these two methods would probably look something
4174: like
4175:
4176: foreach ($resource->parts()) {
4177: my $dateStatus = $resource->getDateStatus($_);
4178: my $completionStatus = $resource->getCompletionStatus($_);
4179:
4180: or
4181:
4182: my $status = $resource->status($_);
4183:
4184: ... use it here ...
4185: }
4186:
4187: Which you use depends on exactly what you are looking for. The
4188: status() function has been optimized for the nav maps display and may
4189: not precisely match what you need elsewhere.
4190:
4191: The symbolic constants shown below can be accessed through the
4192: resource object: C<$res->OPEN>.
4193:
4194: =over 4
4195:
4196: =item * B<getDateStatus>($part):
4197:
4198: ($part defaults to 0). A convenience function that returns a symbolic
4199: constant telling you about the date status of the part. The possible
4200: return values are:
4201:
4202: =back
4203:
4204: B<Date Codes>
4205:
4206: =over 4
4207:
4208: =item * B<OPEN_LATER>:
4209:
4210: The problem will be opened later.
4211:
4212: =item * B<OPEN>:
4213:
4214: Open and not yet due.
4215:
4216:
4217: =item * B<PAST_DUE_ANSWER_LATER>:
4218:
4219: The due date has passed, but the answer date has not yet arrived.
4220:
4221: =item * B<PAST_DUE_NO_ANSWER>:
4222:
4223: The due date has passed and there is no answer opening date set.
4224:
4225: =item * B<ANSWER_OPEN>:
4226:
4227: The answer date is here.
4228:
4229: =item * B<NETWORK_FAILURE>:
4230:
4231: The information is unknown due to network failure.
4232:
4233: =back
4234:
4235: =cut
4236:
4237: # Apparently the compiler optimizes these into constants automatically
4238: sub OPEN_LATER { return 0; }
4239: sub OPEN { return 1; }
4240: sub PAST_DUE_NO_ANSWER { return 2; }
4241: sub PAST_DUE_ANSWER_LATER { return 3; }
4242: sub ANSWER_OPEN { return 4; }
4243: sub NOTHING_SET { return 5; }
4244: sub NETWORK_FAILURE { return 100; }
4245:
4246: # getDateStatus gets the date status for a given problem part.
4247: # Because answer date, due date, and open date are fully independent
4248: # (i.e., it is perfectly possible to *only* have an answer date),
4249: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4250: # (past, future, none given). This function handles this with a decision
4251: # tree. Read the comments to follow the decision tree.
4252:
4253: sub getDateStatus {
4254: my $self = shift;
4255: my $part = shift;
4256: $part = "0" if (!defined($part));
4257:
4258: # Always return network failure if there was one.
4259: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4260:
4261: my $now = time();
4262:
4263: my $open = $self->opendate($part);
4264: my $due = $self->duedate($part);
4265: my $answer = $self->answerdate($part);
4266:
4267: if (!$open && !$due && !$answer) {
4268: # no data on the problem at all
4269: # should this be the same as "open later"? think multipart.
4270: return $self->NOTHING_SET;
4271: }
4272: if (!$open || $now < $open) {return $self->OPEN_LATER}
4273: if (!$due || $now < $due) {return $self->OPEN}
4274: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4275: if ($answer) { return $self->ANSWER_OPEN; }
4276: return PAST_DUE_NO_ANSWER;
4277: }
4278:
4279: =pod
4280:
4281: B<>
4282:
4283: =over 4
4284:
4285: =item * B<getCompletionStatus>($part):
4286:
4287: ($part defaults to 0.) A convenience function that returns a symbolic
4288: constant telling you about the completion status of the part, with the
4289: following possible results:
4290:
4291: =back
4292:
4293: B<Completion Codes>
4294:
4295: =over 4
4296:
4297: =item * B<NOT_ATTEMPTED>:
4298:
4299: Has not been attempted at all.
4300:
4301: =item * B<INCORRECT>:
4302:
4303: Attempted, but wrong by student.
4304:
4305: =item * B<INCORRECT_BY_OVERRIDE>:
4306:
4307: Attempted, but wrong by instructor override.
4308:
4309: =item * B<CORRECT>:
4310:
4311: Correct or correct by instructor.
4312:
4313: =item * B<CORRECT_BY_OVERRIDE>:
4314:
4315: Correct by instructor override.
4316:
4317: =item * B<EXCUSED>:
4318:
4319: Excused. Not yet implemented.
4320:
4321: =item * B<NETWORK_FAILURE>:
4322:
4323: Information not available due to network failure.
4324:
4325: =item * B<ATTEMPTED>:
4326:
4327: Attempted, and not yet graded.
4328:
4329: =back
4330:
4331: =cut
4332:
4333: sub NOT_ATTEMPTED { return 10; }
4334: sub INCORRECT { return 11; }
4335: sub INCORRECT_BY_OVERRIDE { return 12; }
4336: sub CORRECT { return 13; }
4337: sub CORRECT_BY_OVERRIDE { return 14; }
4338: sub EXCUSED { return 15; }
4339: sub ATTEMPTED { return 16; }
4340:
4341: sub getCompletionStatus {
4342: my $self = shift;
4343: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4344:
4345: my $status = $self->queryRestoreHash('solved', shift);
4346:
4347: # Left as separate if statements in case we ever do more with this
4348: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4349: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4350: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
4351: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4352: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4353: if ($status eq 'excused') {return $self->EXCUSED; }
4354: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4355: return $self->NOT_ATTEMPTED;
4356: }
4357:
4358: sub queryRestoreHash {
4359: my $self = shift;
4360: my $hashentry = shift;
4361: my $part = shift;
4362: $part = "0" if (!defined($part) || $part eq '');
4363: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4364:
4365: $self->getReturnHash();
4366:
4367: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4368: }
4369:
4370: =pod
4371:
4372: B<Composite Status>
4373:
4374: Along with directly returning the date or completion status, the
4375: resource object includes a convenience function B<status>() that will
4376: combine the two status tidbits into one composite status that can
4377: represent the status of the resource as a whole. This method represents
4378: the concept of the thing we want to display to the user on the nav maps
4379: screen, which is a combination of completion and open status. The precise logic is
4380: documented in the comments of the status method. The following results
4381: may be returned, all available as methods on the resource object
4382: ($res->NETWORK_FAILURE): In addition to the return values that match
4383: the date or completion status, this function can return "ANSWER_SUBMITTED"
4384: if that problemstatus parameter value is set to No, suppressing the
4385: incorrect/correct feedback.
4386:
4387: =over 4
4388:
4389: =item * B<NETWORK_FAILURE>:
4390:
4391: The network has failed and the information is not available.
4392:
4393: =item * B<NOTHING_SET>:
4394:
4395: No dates have been set for this problem (part) at all. (Because only
4396: certain parts of a multi-part problem may be assigned, this can not be
4397: collapsed into "open later", as we do not know a given part will EVER
4398: be opened. For single part, this is the same as "OPEN_LATER".)
4399:
4400: =item * B<CORRECT>:
4401:
4402: For any reason at all, the part is considered correct.
4403:
4404: =item * B<EXCUSED>:
4405:
4406: For any reason at all, the problem is excused.
4407:
4408: =item * B<PAST_DUE_NO_ANSWER>:
4409:
4410: The problem is past due, not considered correct, and no answer date is
4411: set.
4412:
4413: =item * B<PAST_DUE_ANSWER_LATER>:
4414:
4415: The problem is past due, not considered correct, and an answer date in
4416: the future is set.
4417:
4418: =item * B<ANSWER_OPEN>:
4419:
4420: The problem is past due, not correct, and the answer is now available.
4421:
4422: =item * B<OPEN_LATER>:
4423:
4424: The problem is not yet open.
4425:
4426: =item * B<TRIES_LEFT>:
4427:
4428: The problem is open, has been tried, is not correct, but there are
4429: tries left.
4430:
4431: =item * B<INCORRECT>:
4432:
4433: The problem is open, and all tries have been used without getting the
4434: correct answer.
4435:
4436: =item * B<OPEN>:
4437:
4438: The item is open and not yet tried.
4439:
4440: =item * B<ATTEMPTED>:
4441:
4442: The problem has been attempted.
4443:
4444: =item * B<ANSWER_SUBMITTED>:
4445:
4446: An answer has been submitted, but the student should not see it.
4447:
4448: =back
4449:
4450: =cut
4451:
4452: sub TRIES_LEFT { return 20; }
4453: sub ANSWER_SUBMITTED { return 21; }
4454:
4455: sub status {
4456: my $self = shift;
4457: my $part = shift;
4458: if (!defined($part)) { $part = "0"; }
4459: my $completionStatus = $self->getCompletionStatus($part);
4460: my $dateStatus = $self->getDateStatus($part);
4461:
4462: # What we have is a two-dimensional matrix with 4 entries on one
4463: # dimension and 5 entries on the other, which we want to colorize,
4464: # plus network failure and "no date data at all".
4465:
4466: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4467: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4468:
4469: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4470: # If there's an answer date and we're past it, don't
4471: # suppress the feedback; student should know
4472: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4473: $suppressFeedback = 0;
4474: }
4475:
4476: # There are a few whole rows we can dispose of:
4477: if ($completionStatus == CORRECT ||
4478: $completionStatus == CORRECT_BY_OVERRIDE ) {
4479: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4480: }
4481:
4482: if ($completionStatus == ATTEMPTED) {
4483: return ATTEMPTED;
4484: }
4485:
4486: # If it's EXCUSED, then return that no matter what
4487: if ($completionStatus == EXCUSED) {
4488: return EXCUSED;
4489: }
4490:
4491: if ($dateStatus == NOTHING_SET) {
4492: return NOTHING_SET;
4493: }
4494:
4495: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4496: # by 4 matrix (date statuses).
4497:
4498: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4499: $dateStatus == PAST_DUE_NO_ANSWER ) {
4500: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4501: }
4502:
4503: if ($dateStatus == ANSWER_OPEN) {
4504: return ANSWER_OPEN;
4505: }
4506:
4507: # Now: (incorrect, incorrect_override, not_attempted) x
4508: # (open_later), (open)
4509:
4510: if ($dateStatus == OPEN_LATER) {
4511: return OPEN_LATER;
4512: }
4513:
4514: # If it's WRONG...
4515: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4516: # and there are TRIES LEFT:
4517: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4518: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4519: }
4520: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4521: }
4522:
4523: # Otherwise, it's untried and open
4524: return OPEN;
4525: }
4526:
4527: sub CLOSED { return 23; }
4528: sub ERROR { return 24; }
4529:
4530: =pod
4531:
4532: B<Simple Status>
4533:
4534: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4535: "Simple status" corresponds to "which icon is shown on the
4536: Navmaps". There are six "simple" statuses:
4537:
4538: =over 4
4539:
4540: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4541:
4542: =item * B<OPEN>: The problem is open and unattempted.
4543:
4544: =item * B<CORRECT>: The problem is correct for any reason.
4545:
4546: =item * B<INCORRECT>: The problem is incorrect and can still be
4547: completed successfully.
4548:
4549: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4550: does not know if they are correct. (The ellipsis icon.)
4551:
4552: =item * B<ERROR>: There is an error retrieving information about this
4553: problem.
4554:
4555: =back
4556:
4557: =cut
4558:
4559: # This hash maps the composite status to this simple status, and
4560: # can be used directly, if you like
4561: my %compositeToSimple =
4562: (
4563: NETWORK_FAILURE() => ERROR,
4564: NOTHING_SET() => CLOSED,
4565: CORRECT() => CORRECT,
4566: EXCUSED() => CORRECT,
4567: PAST_DUE_NO_ANSWER() => INCORRECT,
4568: PAST_DUE_ANSWER_LATER() => INCORRECT,
4569: ANSWER_OPEN() => INCORRECT,
4570: OPEN_LATER() => CLOSED,
4571: TRIES_LEFT() => OPEN,
4572: INCORRECT() => INCORRECT,
4573: OPEN() => OPEN,
4574: ATTEMPTED() => ATTEMPTED,
4575: ANSWER_SUBMITTED() => ATTEMPTED
4576: );
4577:
4578: sub simpleStatus {
4579: my $self = shift;
4580: my $part = shift;
4581: my $status = $self->status($part);
4582: return $compositeToSimple{$status};
4583: }
4584:
4585: =pod
4586:
4587: B<simpleStatusCount> will return an array reference containing, in
4588: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4589: and ERROR parts the given problem has.
4590:
4591: =cut
4592:
4593: # This maps the status to the slot we want to increment
4594: my %statusToSlotMap =
4595: (
4596: OPEN() => 0,
4597: CLOSED() => 1,
4598: CORRECT() => 2,
4599: INCORRECT() => 3,
4600: ATTEMPTED() => 4,
4601: ERROR() => 5
4602: );
4603:
4604: sub statusToSlot { return $statusToSlotMap{shift()}; }
4605:
4606: sub simpleStatusCount {
4607: my $self = shift;
4608:
4609: my @counts = (0, 0, 0, 0, 0, 0, 0);
4610: foreach my $part (@{$self->parts()}) {
4611: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4612: }
4613:
4614: return \@counts;
4615: }
4616:
4617: =pod
4618:
4619: B<Completable>
4620:
4621: The completable method represents the concept of I<whether the student can
4622: currently do the problem>. If the student can do the problem, which means
4623: that it is open, there are tries left, and if the problem is manually graded
4624: or the grade is suppressed via problemstatus, the student has not tried it
4625: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4626: either the student has tried it and there is no feedback, or that for
4627: some reason it is no longer completable (not open yet, successfully completed,
4628: out of tries, etc.). As an example, this is used as the filter for the
4629: "Uncompleted Homework" option for the nav maps.
4630:
4631: If this does not quite meet your needs, do not fiddle with it (unless you are
4632: fixing it to better match the student's conception of "completable" because
4633: it's broken somehow)... make a new method.
4634:
4635: =cut
4636:
4637: sub completable {
4638: my $self = shift;
4639: if (!$self->is_problem()) { return 0; }
4640: my $partCount = $self->countParts();
4641:
4642: foreach my $part (@{$self->parts()}) {
4643: if ($part eq '0' && $partCount != 1) { next; }
4644: my $status = $self->status($part);
4645: # "If any of the parts are open, or have tries left (implies open),
4646: # and it is not "attempted" (manually graded problem), it is
4647: # not "complete"
4648: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4649: $status == ANSWER_SUBMITTED() ) {
4650: # did this part already, as well as we can
4651: next;
4652: }
4653: if ($status == OPEN() || $status == TRIES_LEFT()) {
4654: return 1;
4655: }
4656: }
4657:
4658: # If all the parts were complete, so was this problem.
4659: return 0;
4660: }
4661:
4662: =pod
4663:
4664: =head2 Resource/Nav Map Navigation
4665:
4666: =over 4
4667:
4668: =item * B<getNext>():
4669:
4670: Retreive an array of the possible next resources after this
4671: one. Always returns an array, even in the one- or zero-element case.
4672:
4673: =item * B<getPrevious>():
4674:
4675: Retreive an array of the possible previous resources from this
4676: one. Always returns an array, even in the one- or zero-element case.
4677:
4678: =cut
4679:
4680: sub getNext {
4681: my $self = shift;
4682: my @branches;
4683: my $to = $self->to();
4684: foreach my $branch ( split(/,/, $to) ) {
4685: my $choice = $self->{NAV_MAP}->getById($branch);
4686: my $next = $choice->goesto();
4687: $next = $self->{NAV_MAP}->getById($next);
4688:
4689: push @branches, $next;
4690: }
4691: return \@branches;
4692: }
4693:
4694: sub getPrevious {
4695: my $self = shift;
4696: my @branches;
4697: my $from = $self->from();
4698: foreach my $branch ( split /,/, $from) {
4699: my $choice = $self->{NAV_MAP}->getById($branch);
4700: my $prev = $choice->comesfrom();
4701: $prev = $self->{NAV_MAP}->getById($prev);
4702:
4703: push @branches, $prev;
4704: }
4705: return \@branches;
4706: }
4707:
4708: sub browsePriv {
4709: my $self = shift;
4710: if (defined($self->{BROWSE_PRIV})) {
4711: return $self->{BROWSE_PRIV};
4712: }
4713:
4714: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4715: }
4716:
4717: =pod
4718:
4719: =back
4720:
4721: =cut
4722:
4723: 1;
4724:
4725: __END__
4726:
4727:
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