1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.330 2005/06/20 19:47:47 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use GDBM_File;
34: use Apache::Constants qw(:common :http);
35: use Apache::loncommon();
36: use Apache::lonmenu();
37: use Apache::lonenc();
38: use Apache::lonlocal;
39: use Apache::lonnet;
40: use POSIX qw (floor strftime);
41: use Data::Dumper; # for debugging, not always
42: use Time::HiRes qw( gettimeofday tv_interval );
43:
44: # symbolic constants
45: sub SYMB { return 1; }
46: sub URL { return 2; }
47: sub NOTHING { return 3; }
48:
49: # Some data
50:
51: my $resObj = "Apache::lonnavmaps::resource";
52:
53: # Keep these mappings in sync with lonquickgrades, which uses the colors
54: # instead of the icons.
55: my %statusIconMap =
56: (
57: $resObj->CLOSED => '',
58: $resObj->OPEN => 'navmap.open.gif',
59: $resObj->CORRECT => 'navmap.correct.gif',
60: $resObj->INCORRECT => 'navmap.wrong.gif',
61: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
62: $resObj->ERROR => ''
63: );
64:
65: my %iconAltTags =
66: ( 'navmap.correct.gif' => 'Correct',
67: 'navmap.wrong.gif' => 'Incorrect',
68: 'navmap.open.gif' => 'Open' );
69:
70: # Defines a status->color mapping, null string means don't color
71: my %colormap =
72: ( $resObj->NETWORK_FAILURE => '',
73: $resObj->CORRECT => '',
74: $resObj->EXCUSED => '#3333FF',
75: $resObj->PAST_DUE_ANSWER_LATER => '',
76: $resObj->PAST_DUE_NO_ANSWER => '',
77: $resObj->ANSWER_OPEN => '#006600',
78: $resObj->OPEN_LATER => '',
79: $resObj->TRIES_LEFT => '',
80: $resObj->INCORRECT => '',
81: $resObj->OPEN => '',
82: $resObj->NOTHING_SET => '',
83: $resObj->ATTEMPTED => '',
84: $resObj->ANSWER_SUBMITTED => ''
85: );
86: # And a special case in the nav map; what to do when the assignment
87: # is not yet done and due in less then 24 hours
88: my $hurryUpColor = "#FF0000";
89:
90: sub launch_win {
91: my ($mode,$script,$toplinkitems)=@_;
92: my $result;
93: if ($script ne 'no') {
94: $result.='<script type="text/javascript">';
95: }
96: $result.='function launch_navmapwin() {
97: newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
98: }';
99: if ($mode eq 'now') {
100: $result.="\nlaunch_navmapwin();\n";
101: }
102: if ($script ne 'no') {
103: $result.='</script>';
104: }
105: if ($mode eq 'link') {
106: &add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
107: "Launch navigation window");
108: }
109: return $result;
110: }
111:
112: sub close {
113: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
114: return(<<ENDCLOSE);
115: <script type="text/javascript">
116: window.status='Accessing Nav Control';
117: menu=window.open("/adm/rat/empty.html","loncapanav",
118: "height=600,width=400,scrollbars=1");
119: window.status='Closing Nav Control';
120: menu.close();
121: window.status='Done.';
122: </script>
123: ENDCLOSE
124: }
125:
126: sub update {
127: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
128: if (!$env{'request.course.id'}) { return ''; }
129: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
130: return(<<ENDUPDATE);
131: <form name="navform"></form>
132: <script type="text/javascript">
133: this.document.navform.action='/adm/navmaps#curloc';
134: this.document.navform.target='loncapanav';
135: this.document.navform.submit();
136: </script>
137: ENDUPDATE
138: }
139:
140: sub handler {
141: my $r = shift;
142: real_handler($r);
143: }
144:
145: sub real_handler {
146: my $r = shift;
147: #my $t0=[&gettimeofday()];
148: # Handle header-only request
149: if ($r->header_only) {
150: if ($env{'browser.mathml'}) {
151: &Apache::loncommon::content_type($r,'text/xml');
152: } else {
153: &Apache::loncommon::content_type($r,'text/html');
154: }
155: $r->send_http_header;
156: return OK;
157: }
158:
159: # Send header, don't cache this page
160: if ($env{'browser.mathml'}) {
161: &Apache::loncommon::content_type($r,'text/xml');
162: } else {
163: &Apache::loncommon::content_type($r,'text/html');
164: }
165: &Apache::loncommon::no_cache($r);
166: $r->send_http_header;
167:
168: my %toplinkitems=();
169: &add_linkitem(\%toplinkitems,'blank','',"Select Action");
170: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
171: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
172: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
173: my $menu=&Apache::lonmenu::reopenmenu();
174: my $navstatus=&Apache::lonmenu::get_nav_status();
175: if ($menu) {
176: $menu=(<<MENU)
177: swmenu=$menu
178: swmenu.clearTimeout(swmenu.menucltim);
179: $navstatus
180: MENU
181: } else {
182: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
183: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
184: $menu=(<<MENU)
185: swmenu=$mainwindow
186: $navstatus
187: MENU
188: }
189: my $html=&Apache::lonxml::xmlbegin();
190: $r->print(<<"ENDSUBM");
191: $html
192: <head>
193: <script type="text/javascript">
194: function submitthis() {
195: $menu
196: self.close();
197: }
198:
199: </script>
200: </head>
201: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
202: </html>
203: ENDSUBM
204: return;
205: }
206: if ($ENV{QUERY_STRING} eq 'launchExternal') {
207: &Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
208: &Apache::lonnet::appenv('environment.remotenavmap' => 'on');
209: }
210:
211: # Create the nav map
212: my $navmap = Apache::lonnavmaps::navmap->new();
213:
214: if (!defined($navmap)) {
215: my $requrl = $r->uri;
216: $env{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
217: return HTTP_NOT_ACCEPTABLE;
218: }
219: my $html=&Apache::lonxml::xmlbegin();
220: $r->print("$html<head>\n");
221: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
222: # ------------------------------------------------------------ Get query string
223: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework','postsymb']);
224:
225: # ----------------------------------------------------- Force menu registration
226: my $addentries='';
227: my $more_unload;
228: my $body_only='';
229: if ($env{'environment.remotenavmap'} eq 'on') {
230: $r->print('<script type="text/javascript">
231: function collapse() {
232: this.document.location="/adm/navmaps?collapseExternal";
233: }
234: </script>');
235: # FIXME need to be smarter to only catch window close events
236: # $more_unload="collapse()"
237: $body_only=1;
238: }
239: if ($env{'form.register'}) {
240: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
241: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
242: $more_unload.'"';
243: $r->print(&Apache::lonmenu::registerurl(1));
244: } else {
245: $addentries=' onUnload="'.$more_unload.'"';
246: }
247:
248: # Header
249: $r->print('</head>'.
250: &Apache::loncommon::bodytag('Navigate Course Contents','',
251: $addentries,$body_only,'',
252: $env{'form.register'}));
253: $r->print('<script>window.focus();</script>');
254:
255: $r->rflush();
256:
257: # Check that it's defined
258: if (!($navmap->courseMapDefined())) {
259: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
260: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
261: '</body></html>');
262: return OK;
263: }
264:
265: # See if there's only one map in the top-level, if we don't
266: # already have a filter... if so, automatically display it
267: # (older code; should use retrieveResources)
268: if ($ENV{QUERY_STRING} !~ /filter/) {
269: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
270: my $curRes;
271: my $sequenceCount = 0;
272: my $sequenceId;
273: while ($curRes = $iterator->next()) {
274: if (ref($curRes) && $curRes->is_sequence()) {
275: $sequenceCount++;
276: $sequenceId = $curRes->map_pc();
277: }
278: }
279:
280: if ($sequenceCount == 1) {
281: # The automatic iterator creation in the render call
282: # will pick this up. We know the condition because
283: # the defined($env{'form.filter'}) also ensures this
284: # is a fresh call.
285: $env{'form.filter'} = "$sequenceId";
286: }
287: }
288:
289: if ($ENV{QUERY_STRING} eq 'launchExternal') {
290: $r->print('
291: <form name="returnwin" action="/adm/flip?postdata=return%3a"
292: method="post" target="loncapaclient">
293: </form>');
294: $r->print('
295: <script type="text/javascript">
296: this.document.returnwin.submit();
297: </script>');
298: }
299:
300: if ($env{'environment.remotenavmap'} ne 'on') {
301: $r->print(&launch_win('link','yes',\%toplinkitems));
302: }
303: if ($env{'environment.remotenavmap'} eq 'on') {
304: &add_linkitem(\%toplinkitems,'closenav','collapse()',
305: "Close navigation window");
306: }
307:
308: my $jumpToFirstHomework = 0;
309: # Check to see if the student is jumping to next open, do-able problem
310: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
311: $jumpToFirstHomework = 1;
312: # Find the next homework problem that they can do.
313: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
314: my $curRes;
315: my $foundDoableProblem = 0;
316: my $problemRes;
317:
318: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
319: if (ref($curRes) && $curRes->is_problem()) {
320: my $status = $curRes->status();
321: if ($curRes->completable()) {
322: $problemRes = $curRes;
323: $foundDoableProblem = 1;
324:
325: # Pop open all previous maps
326: my $stack = $iterator->getStack();
327: pop @$stack; # last resource in the stack is the problem
328: # itself, which we don't need in the map stack
329: my @mapPcs = map {$_->map_pc()} @$stack;
330: $env{'form.filter'} = join(',', @mapPcs);
331:
332: # Mark as both "here" and "jump"
333: $env{'form.postsymb'} = $curRes->symb();
334: }
335: }
336: }
337:
338: # If we found no problems, print a note to that effect.
339: if (!$foundDoableProblem) {
340: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
341: }
342: } else {
343: &add_linkitem(\%toplinkitems,'firsthomework',
344: 'location.href="navmaps?jumpToFirstHomework"',
345: "Show Me My First Homework Problem");
346: }
347:
348: my $suppressEmptySequences = 0;
349: my $filterFunc = undef;
350: my $resource_no_folder_link = 0;
351:
352: # Display only due homework.
353: my $showOnlyHomework = 0;
354: if ($env{'form.showOnlyHomework'} eq "1") {
355: $showOnlyHomework = 1;
356: $suppressEmptySequences = 1;
357: $filterFunc = sub { my $res = shift;
358: return $res->completable() || $res->is_map();
359: };
360: &add_linkitem(\%toplinkitems,'everything',
361: 'location.href="navmaps?sort='.$env{'form.sort'}.'"',
362: "Show Everything");
363: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
364: $env{'form.filter'} = '';
365: $env{'form.condition'} = 1;
366: $resource_no_folder_link = 1;
367: } else {
368: &add_linkitem(\%toplinkitems,'uncompleted',
369: 'location.href="navmaps?sort='.$env{'form.sort'}.
370: '&showOnlyHomework=1"',
371: "Show Only Uncompleted Homework");
372: }
373:
374: my %selected=($env{'form.sort'} => 'selected=on');
375: my $sort_html=("<form>
376: <nobr>
377: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$env{'form.showOnlyHomework'}."\" />
378: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
379: <select name=\"sort\">
380: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
381: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
382: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
383: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has New Discussion')."</option>
384: </select>
385: </nobr>
386: </form>");
387: # renderer call
388: my $renderArgs = { 'cols' => [0,1,2,3],
389: 'sort' => $env{'form.sort'},
390: 'url' => '/adm/navmaps',
391: 'navmap' => $navmap,
392: 'suppressNavmap' => 1,
393: 'suppressEmptySequences' => $suppressEmptySequences,
394: 'filterFunc' => $filterFunc,
395: 'resource_no_folder_link' => $resource_no_folder_link,
396: 'sort_html'=> $sort_html,
397: 'r' => $r,
398: 'caller' => 'navmapsdisplay',
399: 'linkitems' => \%toplinkitems};
400: my $render = render($renderArgs);
401:
402: # If no resources were printed, print a reassuring message so the
403: # user knows there was no error.
404: if ($renderArgs->{'counter'} == 0) {
405: if ($showOnlyHomework) {
406: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
407: } else { # both jumpToFirstHomework and normal use the same: course must be empty
408: $r->print("<p><font size='+1'>This course is empty.</font></p>");
409: }
410: }
411: #my $td=&tv_interval($t0);
412: #$r->print("<br />$td");
413:
414: $r->print("</body></html>");
415: $r->rflush();
416:
417: return OK;
418: }
419:
420: # Convenience functions: Returns a string that adds or subtracts
421: # the second argument from the first hash, appropriate for the
422: # query string that determines which folders to recurse on
423: sub addToFilter {
424: my $hashIn = shift;
425: my $addition = shift;
426: my %hash = %$hashIn;
427: $hash{$addition} = 1;
428:
429: return join (",", keys(%hash));
430: }
431:
432: sub removeFromFilter {
433: my $hashIn = shift;
434: my $subtraction = shift;
435: my %hash = %$hashIn;
436:
437: delete $hash{$subtraction};
438: return join(",", keys(%hash));
439: }
440:
441: # Convenience function: Given a stack returned from getStack on the iterator,
442: # return the correct src() value.
443: sub getLinkForResource {
444: my $stack = shift;
445: my $res;
446:
447: # Check to see if there are any pages in the stack
448: foreach $res (@$stack) {
449: if (defined($res)) {
450: my $anchor;
451: if ($res->is_page()) {
452: foreach (@$stack) { if (defined($_)) { $anchor = $_; } }
453: $anchor=&Apache::lonnet::escape($anchor->shown_symb());
454: return ($res->link(),$res->shown_symb(),$anchor);
455: }
456: # in case folder was skipped over as "only sequence"
457: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
458: if ($map=~/\.page$/) {
459: my $url=&Apache::lonnet::clutter($map);
460: $anchor=&Apache::lonnet::escape($src->shown_symb());
461: return ($url,$res->shown_symb(),$anchor);
462: }
463: }
464: }
465:
466: # Failing that, return the src of the last resource that is defined
467: # (when we first recurse on a map, it puts an undefined resource
468: # on the bottom because $self->{HERE} isn't defined yet, and we
469: # want the src for the map anyhow)
470: foreach (@$stack) {
471: if (defined($_)) { $res = $_; }
472: }
473:
474: return ($res->link(),$res->shown_symb());
475: }
476:
477: # Convenience function: This separates the logic of how to create
478: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
479: # etc.) into a separate function. It takes a resource object as the
480: # first parameter, and the part number of the resource as the second.
481: # It's basically a big switch statement on the status of the resource.
482:
483: sub getDescription {
484: my $res = shift;
485: my $part = shift;
486: my $status = $res->status($part);
487:
488: if ($status == $res->NETWORK_FAILURE) {
489: return &mt("Having technical difficulties; please check status later");
490: }
491: if ($status == $res->NOTHING_SET) {
492: return &mt("Not currently assigned.");
493: }
494: if ($status == $res->OPEN_LATER) {
495: return "Open " . timeToHumanString($res->opendate($part));
496: }
497: if ($status == $res->OPEN) {
498: if ($res->duedate($part)) {
499: return &mt("Due")." " .timeToHumanString($res->duedate($part));
500: } else {
501: return &mt("Open, no due date");
502: }
503: }
504: if ($status == $res->PAST_DUE_ANSWER_LATER) {
505: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
506: }
507: if ($status == $res->PAST_DUE_NO_ANSWER) {
508: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
509: }
510: if ($status == $res->ANSWER_OPEN) {
511: return &mt("Answer available");
512: }
513: if ($status == $res->EXCUSED) {
514: return &mt("Excused by instructor");
515: }
516: if ($status == $res->ATTEMPTED) {
517: return &mt("Answer submitted, not yet graded");
518: }
519: if ($status == $res->TRIES_LEFT) {
520: my $tries = $res->tries($part);
521: my $maxtries = $res->maxtries($part);
522: my $triesString = "";
523: if ($tries && $maxtries) {
524: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
525: if ($maxtries > 1 && $maxtries - $tries == 1) {
526: $triesString = "<b>$triesString</b>";
527: }
528: }
529: if ($res->duedate($part)) {
530: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
531: " $triesString";
532: } else {
533: return &mt("No due date")." $triesString";
534: }
535: }
536: if ($status == $res->ANSWER_SUBMITTED) {
537: return &mt('Answer submitted');
538: }
539: }
540:
541: # Convenience function, so others can use it: Is the problem due in less then
542: # 24 hours, and still can be done?
543:
544: sub dueInLessThan24Hours {
545: my $res = shift;
546: my $part = shift;
547: my $status = $res->status($part);
548:
549: return ($status == $res->OPEN() ||
550: $status == $res->TRIES_LEFT()) &&
551: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
552: $res->duedate($part) > time();
553: }
554:
555: # Convenience function, so others can use it: Is there only one try remaining for the
556: # part, with more then one try to begin with, not due yet and still can be done?
557: sub lastTry {
558: my $res = shift;
559: my $part = shift;
560:
561: my $tries = $res->tries($part);
562: my $maxtries = $res->maxtries($part);
563: return $tries && $maxtries && $maxtries > 1 &&
564: $maxtries - $tries == 1 && $res->duedate($part) &&
565: $res->duedate($part) > time();
566: }
567:
568: # This puts a human-readable name on the env variable.
569:
570: sub advancedUser {
571: return $env{'request.role.adv'};
572: }
573:
574:
575: # timeToHumanString takes a time number and converts it to a
576: # human-readable representation, meant to be used in the following
577: # manner:
578: # print "Due $timestring"
579: # print "Open $timestring"
580: # print "Answer available $timestring"
581: # Very, very, very, VERY English-only... goodness help a localizer on
582: # this func...
583: sub timeToHumanString {
584: my ($time) = @_;
585: # zero, '0' and blank are bad times
586: if (!$time) {
587: return &mt('never');
588: }
589: unless (&Apache::lonlocal::current_language()=~/^en/) {
590: return &Apache::lonlocal::locallocaltime($time);
591: }
592: my $now = time();
593:
594: my @time = localtime($time);
595: my @now = localtime($now);
596:
597: # Positive = future
598: my $delta = $time - $now;
599:
600: my $minute = 60;
601: my $hour = 60 * $minute;
602: my $day = 24 * $hour;
603: my $week = 7 * $day;
604: my $inPast = 0;
605:
606: # Logic in comments:
607: # Is it now? (extremely unlikely)
608: if ( $delta == 0 ) {
609: return "this instant";
610: }
611:
612: if ($delta < 0) {
613: $inPast = 1;
614: $delta = -$delta;
615: }
616:
617: if ( $delta > 0 ) {
618:
619: my $tense = $inPast ? " ago" : "";
620: my $prefix = $inPast ? "" : "in ";
621:
622: # Less then a minute
623: if ( $delta < $minute ) {
624: if ($delta == 1) { return "${prefix}1 second$tense"; }
625: return "$prefix$delta seconds$tense";
626: }
627:
628: # Less then an hour
629: if ( $delta < $hour ) {
630: # If so, use minutes
631: my $minutes = floor($delta / 60);
632: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
633: return "$prefix$minutes minutes$tense";
634: }
635:
636: # Is it less then 24 hours away? If so,
637: # display hours + minutes
638: if ( $delta < $hour * 24) {
639: my $hours = floor($delta / $hour);
640: my $minutes = floor(($delta % $hour) / $minute);
641: my $hourString = "$hours hours";
642: my $minuteString = ", $minutes minutes";
643: if ($hours == 1) {
644: $hourString = "1 hour";
645: }
646: if ($minutes == 1) {
647: $minuteString = ", 1 minute";
648: }
649: if ($minutes == 0) {
650: $minuteString = "";
651: }
652: return "$prefix$hourString$minuteString$tense";
653: }
654:
655: # Less then 5 days away, display day of the week and
656: # HH:MM
657: if ( $delta < $day * 5 ) {
658: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
659: $timeStr =~ s/12:00 am/00:00/;
660: $timeStr =~ s/12:00 pm/noon/;
661: return ($inPast ? "last " : "next ") .
662: $timeStr;
663: }
664:
665: # Is it this year?
666: if ( $time[5] == $now[5]) {
667: # Return on Month Day, HH:MM meridian
668: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
669: $timeStr =~ s/12:00 am/00:00/;
670: $timeStr =~ s/12:00 pm/noon/;
671: return $timeStr;
672: }
673:
674: # Not this year, so show the year
675: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
676: $timeStr =~ s/12:00 am/00:00/;
677: $timeStr =~ s/12:00 pm/noon/;
678: return $timeStr;
679: }
680: }
681:
682:
683: =pod
684:
685: =head1 NAME
686:
687: Apache::lonnavmap - Subroutines to handle and render the navigation
688: maps
689:
690: =head1 SYNOPSIS
691:
692: The main handler generates the navigational listing for the course,
693: the other objects export this information in a usable fashion for
694: other modules.
695:
696: =head1 OVERVIEW
697:
698: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
699: course structure and caches it in what is often referred to as the
700: "big hash" X<big hash>. You can see it if you are logged into
701: LON-CAPA, in a course, by going to /adm/test. (You may need to
702: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
703: content of the hash will be under the heading "Big Hash".
704:
705: Big Hash contains, among other things, how resources are related
706: to each other (next/previous), what resources are maps, which
707: resources are being chosen to not show to the student (for random
708: selection), and a lot of other things that can take a lot of time
709: to compute due to the amount of data that needs to be collected and
710: processed.
711:
712: Apache::lonnavmaps provides an object model for manipulating this
713: information in a higher-level fashion then directly manipulating
714: the hash. It also provides access to several auxilary functions
715: that aren't necessarily stored in the Big Hash, but are a per-
716: resource sort of value, like whether there is any feedback on
717: a given resource.
718:
719: Apache::lonnavmaps also abstracts away branching, and someday,
720: conditions, for the times where you don't really care about those
721: things.
722:
723: Apache::lonnavmaps also provides fairly powerful routines for
724: rendering navmaps, and last but not least, provides the navmaps
725: view for when the user clicks the NAV button.
726:
727: B<Note>: Apache::lonnavmaps I<only> works for the "currently
728: logged in user"; if you want things like "due dates for another
729: student" lonnavmaps can not directly retrieve information like
730: that. You need the EXT function. This module can still help,
731: because many things, such as the course structure, are constant
732: between users, and Apache::lonnavmaps can help by providing
733: symbs for the EXT call.
734:
735: The rest of this file will cover the provided rendering routines,
736: which can often be used without fiddling with the navmap object at
737: all, then documents the Apache::lonnavmaps::navmap object, which
738: is the key to accessing the Big Hash information, covers the use
739: of the Iterator (which provides the logic for traversing the
740: somewhat-complicated Big Hash data structure), documents the
741: Apache::lonnavmaps::Resource objects that are returned by
742:
743: =head1 Subroutine: render
744:
745: The navmap renderer package provides a sophisticated rendering of the
746: standard navigation maps interface into HTML. The provided nav map
747: handler is actually just a glorified call to this.
748:
749: Because of the large number of parameters this function accepts,
750: instead of passing it arguments as is normal, pass it in an anonymous
751: hash with the desired options.
752:
753: The package provides a function called 'render', called as
754: Apache::lonnavmaps::render({}).
755:
756: =head2 Overview of Columns
757:
758: The renderer will build an HTML table for the navmap and return
759: it. The table is consists of several columns, and a row for each
760: resource (or possibly each part). You tell the renderer how many
761: columns to create and what to place in each column, optionally using
762: one or more of the prepared columns, and the renderer will assemble
763: the table.
764:
765: Any additional generally useful column types should be placed in the
766: renderer code here, so anybody can use it anywhere else. Any code
767: specific to the current application (such as the addition of <input>
768: elements in a column) should be placed in the code of the thing using
769: the renderer.
770:
771: At the core of the renderer is the array reference COLS (see Example
772: section below for how to pass this correctly). The COLS array will
773: consist of entries of one of two types of things: Either an integer
774: representing one of the pre-packaged column types, or a sub reference
775: that takes a resource reference, a part number, and a reference to the
776: argument hash passed to the renderer, and returns a string that will
777: be inserted into the HTML representation as it.
778:
779: All other parameters are ways of either changing how the columns
780: are printing, or which rows are shown.
781:
782: The pre-packaged column names are refered to by constants in the
783: Apache::lonnavmaps namespace. The following currently exist:
784:
785: =over 4
786:
787: =item * B<Apache::lonnavmaps::resource>:
788:
789: The general info about the resource: Link, icon for the type, etc. The
790: first column in the standard nav map display. This column provides the
791: indentation effect seen in the B<NAV> screen. This column also accepts
792: the following parameters in the renderer hash:
793:
794: =over 4
795:
796: =item * B<resource_nolink>: default false
797:
798: If true, the resource will not be linked. By default, all non-folder
799: resources are linked.
800:
801: =item * B<resource_part_count>: default true
802:
803: If true, the resource will show a part count B<if> the full
804: part list is not displayed. (See "condense_parts" later.) If false,
805: the resource will never show a part count.
806:
807: =item * B<resource_no_folder_link>:
808:
809: If true, the resource's folder will not be clickable to open or close
810: it. Default is false. True implies printCloseAll is false, since you
811: can't close or open folders when this is on anyhow.
812:
813: =back
814:
815: =item * B<Apache::lonnavmaps::communication_status>:
816:
817: Whether there is discussion on the resource, email for the user, or
818: (lumped in here) perl errors in the execution of the problem. This is
819: the second column in the main nav map.
820:
821: =item * B<Apache::lonnavmaps::quick_status>:
822:
823: An icon for the status of a problem, with five possible states:
824: Correct, incorrect, open, awaiting grading (for a problem where the
825: computer's grade is suppressed, or the computer can't grade, like
826: essay problem), or none (not open yet, not a problem). The
827: third column of the standard navmap.
828:
829: =item * B<Apache::lonnavmaps::long_status>:
830:
831: A text readout of the details of the current status of the problem,
832: such as "Due in 22 hours". The fourth column of the standard navmap.
833:
834: =item * B<Apache::lonnavmaps::part_status_summary>:
835:
836: A text readout summarizing the status of the problem. If it is a
837: single part problem, will display "Correct", "Incorrect",
838: "Not yet open", "Open", "Attempted", or "Error". If there are
839: multiple parts, this will output a string that in HTML will show a
840: status of how many parts are in each status, in color coding, trying
841: to match the colors of the icons within reason.
842:
843: Note this only makes sense if you are I<not> showing parts. If
844: C<showParts> is true (see below), this column will not output
845: anything.
846:
847: =back
848:
849: If you add any others please be sure to document them here.
850:
851: An example of a column renderer that will show the ID number of a
852: resource, along with the part name if any:
853:
854: sub {
855: my ($resource, $part, $params) = @_;
856: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
857: return '<td>' . $resource->{ID} . '</td>';
858: }
859:
860: Note these functions are responsible for the TD tags, which allow them
861: to override vertical and horizontal alignment, etc.
862:
863: =head2 Parameters
864:
865: Minimally, you should be
866: able to get away with just using 'cols' (to specify the columns
867: shown), 'url' (necessary for the folders to link to the current screen
868: correctly), and possibly 'queryString' if your app calls for it. In
869: that case, maintaining the state of the folders will be done
870: automatically.
871:
872: =over 4
873:
874: =item * B<iterator>: default: constructs one from %env
875:
876: A reference to a fresh ::iterator to use from the navmaps. The
877: rendering will reflect the options passed to the iterator, so you can
878: use that to just render a certain part of the course, if you like. If
879: one is not passed, the renderer will attempt to construct one from
880: env{'form.filter'} and env{'form.condition'} information, plus the
881: 'iterator_map' parameter if any.
882:
883: =item * B<iterator_map>: default: not used
884:
885: If you are letting the renderer do the iterator handling, you can
886: instruct the renderer to render only a particular map by passing it
887: the source of the map you want to process, like
888: '/res/103/jerf/navmap.course.sequence'.
889:
890: =item * B<navmap>: default: constructs one from %env
891:
892: A reference to a navmap, used only if an iterator is not passed in. If
893: this is necessary to make an iterator but it is not passed in, a new
894: one will be constructed based on env info. This is useful to do basic
895: error checking before passing it off to render.
896:
897: =item * B<r>: default: must be passed in
898:
899: The standard Apache response object. This must be passed to the
900: renderer or the course hash will be locked.
901:
902: =item * B<cols>: default: empty (useless)
903:
904: An array reference
905:
906: =item * B<showParts>:default true
907:
908: A flag. If true, a line for the resource itself, and a line
909: for each part will be displayed. If not, only one line for each
910: resource will be displayed.
911:
912: =item * B<condenseParts>: default true
913:
914: A flag. If true, if all parts of the problem have the same
915: status and that status is Nothing Set, Correct, or Network Failure,
916: then only one line will be displayed for that resource anyhow. If no,
917: all parts will always be displayed. If showParts is 0, this is
918: ignored.
919:
920: =item * B<jumpCount>: default: determined from %env
921:
922: A string identifying the URL to place the anchor 'curloc' at.
923: It is the responsibility of the renderer user to
924: ensure that the #curloc is in the URL. By default, determined through
925: the use of the env{} 'jump' information, and should normally "just
926: work" correctly.
927:
928: =item * B<here>: default: empty string
929:
930: A Symb identifying where to place the 'here' marker. The empty
931: string means no marker.
932:
933: =item * B<indentString>: default: 25 pixel whitespace image
934:
935: A string identifying the indentation string to use.
936:
937: =item * B<queryString>: default: empty
938:
939: A string which will be prepended to the query string used when the
940: folders are opened or closed. You can use this to pass
941: application-specific values.
942:
943: =item * B<url>: default: none
944:
945: The url the folders will link to, which should be the current
946: page. Required if the resource info column is shown, and you
947: are allowing the user to open and close folders.
948:
949: =item * B<currentJumpIndex>: default: no jumping
950:
951: Describes the currently-open row number to cause the browser to jump
952: to, because the user just opened that folder. By default, pulled from
953: the Jump information in the env{'form.*'}.
954:
955: =item * B<printKey>: default: false
956:
957: If true, print the key that appears on the top of the standard
958: navmaps.
959:
960: =item * B<printCloseAll>: default: true
961:
962: If true, print the "Close all folders" or "open all folders"
963: links.
964:
965: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
966:
967: A function that takes the resource object as its only parameter and
968: returns a true or false value. If true, the resource is displayed. If
969: false, it is simply skipped in the display.
970:
971: =item * B<suppressEmptySequences>: default: false
972:
973: If you're using a filter function, and displaying sequences to orient
974: the user, then frequently some sequences will be empty. Setting this to
975: true will cause those sequences not to display, so as not to confuse the
976: user into thinking that if the sequence is there there should be things
977: under it; for example, see the "Show Uncompleted Homework" view on the
978: B<NAV> screen.
979:
980: =item * B<suppressNavmaps>: default: false
981:
982: If true, will not display Navigate Content resources.
983:
984: =back
985:
986: =head2 Additional Info
987:
988: In addition to the parameters you can pass to the renderer, which will
989: be passed through unchange to the column renderers, the renderer will
990: generate the following information which your renderer may find
991: useful:
992:
993: =over 4
994:
995: =item * B<counter>:
996:
997: Contains the number of rows printed. Useful after calling the render
998: function, as you can detect whether anything was printed at all.
999:
1000: =item * B<isNewBranch>:
1001:
1002: Useful for renderers: If this resource is currently the first resource
1003: of a new branch, this will be true. The Resource column (leftmost in the
1004: navmaps screen) uses this to display the "new branch" icon
1005:
1006: =back
1007:
1008: =cut
1009:
1010: sub resource { return 0; }
1011: sub communication_status { return 1; }
1012: sub quick_status { return 2; }
1013: sub long_status { return 3; }
1014: sub part_status_summary { return 4; }
1015:
1016: sub render_resource {
1017: my ($resource, $part, $params) = @_;
1018:
1019: my $nonLinkedText = ''; # stuff after resource title not in link
1020:
1021: my $link = $params->{"resourceLink"};
1022:
1023: # The URL part is not escaped at this point, but the symb is...
1024: # The stuff to the left of the ? must have ' replaced by \' since
1025: # it will be quoted with ' in the href.
1026:
1027: my ($left,$right) = split(/\?/, $link);
1028: $left =~ s/'/\\'/g;
1029: $link = $left.'?'.$right;
1030:
1031: my $src = $resource->src();
1032: my $it = $params->{"iterator"};
1033: my $filter = $it->{FILTER};
1034:
1035: my $title = $resource->compTitle();
1036:
1037: my $partLabel = "";
1038: my $newBranchText = "";
1039: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1040: # If this is a new branch, label it so
1041: if ($params->{'isNewBranch'}) {
1042: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
1043: }
1044:
1045: # links to open and close the folder
1046:
1047:
1048: my $linkopen = "<a href='$link'>";
1049:
1050:
1051: my $linkclose = "</a>";
1052:
1053: # Default icon: unknown page
1054: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
1055:
1056: if ($resource->is_problem()) {
1057: if ($part eq '0' || $params->{'condensed'}) {
1058: $icon ='<img src="'.$location.'/problem.gif" alt=" " border="0" />';
1059: } else {
1060: $icon = $params->{'indentString'};
1061: }
1062: } else {
1063: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
1064: }
1065:
1066: # Display the correct map icon to open or shut map
1067: if ($resource->is_map()) {
1068: my $mapId = $resource->map_pc();
1069: my $nowOpen = !defined($filter->{$mapId});
1070: if ($it->{CONDITION}) {
1071: $nowOpen = !$nowOpen;
1072: }
1073:
1074: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1075:
1076: if (!$params->{'resource_no_folder_link'}) {
1077: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1078: $icon = "<img src='$location/$icon' alt='".
1079: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1080:
1081: $linkopen = "<a href='" . $params->{'url'} . '?' .
1082: $params->{'queryString'} . '&filter=';
1083: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1084: addToFilter($filter, $mapId) :
1085: removeFromFilter($filter, $mapId);
1086: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1087: . $params->{'hereType'} . '&here=' .
1088: &Apache::lonnet::escape($params->{'here'}) .
1089: '&jump=' .
1090: &Apache::lonnet::escape($resource->symb()) .
1091: "&folderManip=1'>";
1092:
1093: } else {
1094: # Don't allow users to manipulate folder
1095: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1096: '.nomanip.gif';
1097: $icon = "<img src='$location/$icon' alt='".
1098: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1099:
1100: $linkopen = "";
1101: $linkclose = "";
1102: }
1103: }
1104:
1105: if ($resource->randomout()) {
1106: $nonLinkedText .= ' <i>(hidden)</i> ';
1107: }
1108:
1109: # We're done preparing and finally ready to start the rendering
1110: my $result = "<td align='left' valign='center'>";
1111:
1112: my $indentLevel = $params->{'indentLevel'};
1113: if ($newBranchText) { $indentLevel--; }
1114:
1115: # print indentation
1116: for (my $i = 0; $i < $indentLevel; $i++) {
1117: $result .= $params->{'indentString'};
1118: }
1119:
1120: # Decide what to display
1121:
1122: $result .= "$newBranchText$linkopen$icon$linkclose";
1123:
1124: my $curMarkerBegin = '';
1125: my $curMarkerEnd = '';
1126:
1127: # Is this the current resource?
1128: if (!$params->{'displayedHereMarker'} &&
1129: $resource->symb() eq $params->{'here'} ) {
1130: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1131: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1132: $params->{'displayedHereMarker'} = 1;
1133: }
1134:
1135: if ($resource->is_problem() && $part ne '0' &&
1136: !$params->{'condensed'}) {
1137: my $displaypart=$resource->part_display($part);
1138: $partLabel = " (Part: $displaypart)";
1139: if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1140: $title = "";
1141: }
1142:
1143: if ($params->{'condensed'} && $resource->countParts() > 1) {
1144: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1145: }
1146:
1147: my $target;
1148: if ($env{'environment.remotenavmap'} eq 'on') {
1149: $target=' target="loncapaclient" ';
1150: }
1151: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1152: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1153: } else {
1154: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1155: }
1156:
1157: return $result;
1158: }
1159:
1160: sub render_communication_status {
1161: my ($resource, $part, $params) = @_;
1162: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1163:
1164: my $link = $params->{"resourceLink"};
1165: my $linkopen = "<a href='$link'>";
1166: my $linkclose = "</a>";
1167: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1168: if ($resource->hasDiscussion()) {
1169: $discussionHTML = $linkopen .
1170: '<img border="0" src="'.$location.'/chat.gif" />' .
1171: $linkclose;
1172: }
1173:
1174: if ($resource->getFeedback()) {
1175: my $feedback = $resource->getFeedback();
1176: foreach (split(/\,/, $feedback)) {
1177: if ($_) {
1178: $feedbackHTML .= ' <a href="/adm/email?display='
1179: . &Apache::lonnet::escape($_) . '">'
1180: . '<img src="'.$location.'/feedback.gif" '
1181: . 'border="0" /></a>';
1182: }
1183: }
1184: }
1185:
1186: if ($resource->getErrors()) {
1187: my $errors = $resource->getErrors();
1188: my $errorcount = 0;
1189: foreach (split(/,/, $errors)) {
1190: last if ($errorcount>=10); # Only output 10 bombs maximum
1191: if ($_) {
1192: $errorcount++;
1193: $errorHTML .= ' <a href="/adm/email?display='
1194: . &Apache::lonnet::escape($_) . '">'
1195: . '<img src="'.$location.'/bomb.gif" '
1196: . 'border="0" /></a>';
1197: }
1198: }
1199: }
1200:
1201: if ($params->{'multipart'} && $part != '0') {
1202: $discussionHTML = $feedbackHTML = $errorHTML = '';
1203: }
1204:
1205: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1206:
1207: }
1208: sub render_quick_status {
1209: my ($resource, $part, $params) = @_;
1210: my $result = "";
1211: my $firstDisplayed = !$params->{'condensed'} &&
1212: $params->{'multipart'} && $part eq "0";
1213:
1214: my $link = $params->{"resourceLink"};
1215: my $linkopen = "<a href='$link'>";
1216: my $linkclose = "</a>";
1217:
1218: if ($resource->is_problem() &&
1219: !$firstDisplayed) {
1220:
1221: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1222: my $alt = $iconAltTags{$icon};
1223: if ($icon) {
1224: my $location=
1225: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1226: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1227: } else {
1228: $result .= "<td width='30'> </td>\n";
1229: }
1230: } else { # not problem, no icon
1231: $result .= "<td width='30'> </td>\n";
1232: }
1233:
1234: return $result;
1235: }
1236: sub render_long_status {
1237: my ($resource, $part, $params) = @_;
1238: my $result = "<td align='right' valign='center'>\n";
1239: my $firstDisplayed = !$params->{'condensed'} &&
1240: $params->{'multipart'} && $part eq "0";
1241:
1242: my $color;
1243: if ($resource->is_problem()) {
1244: $color = $colormap{$resource->status};
1245:
1246: if (dueInLessThan24Hours($resource, $part) ||
1247: lastTry($resource, $part)) {
1248: $color = $hurryUpColor;
1249: }
1250: }
1251:
1252: if ($resource->kind() eq "res" &&
1253: $resource->is_problem() &&
1254: !$firstDisplayed) {
1255: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1256: $result .= getDescription($resource, $part);
1257: if ($color) {$result .= "</b></font>"; }
1258: }
1259: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1260: $result .= '(randomly select ' . $resource->randompick() .')';
1261: }
1262:
1263: # Debugging code
1264: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1265: # ' - Part: ' . $part;
1266:
1267: $result .= "</td>\n";
1268:
1269: return $result;
1270: }
1271:
1272: # Colors obtained by taking the icons, matching the colors, and
1273: # possibly reducing the Value (HSV) of the color, if it's too bright
1274: # for text, generally by one third or so.
1275: my %statusColors =
1276: (
1277: $resObj->CLOSED => '#000000',
1278: $resObj->OPEN => '#998b13',
1279: $resObj->CORRECT => '#26933f',
1280: $resObj->INCORRECT => '#c48207',
1281: $resObj->ATTEMPTED => '#a87510',
1282: $resObj->ERROR => '#000000'
1283: );
1284: my %statusStrings =
1285: (
1286: $resObj->CLOSED => 'Not yet open',
1287: $resObj->OPEN => 'Open',
1288: $resObj->CORRECT => 'Correct',
1289: $resObj->INCORRECT => 'Incorrect',
1290: $resObj->ATTEMPTED => 'Attempted',
1291: $resObj->ERROR => 'Network Error'
1292: );
1293: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1294:
1295: use Data::Dumper;
1296: sub render_parts_summary_status {
1297: my ($resource, $part, $params) = @_;
1298: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1299: if ($params->{showParts}) {
1300: return '<td></td>';
1301: }
1302:
1303: my $td = "<td align='right'>\n";
1304: my $endtd = "</td>\n";
1305: my @probs;
1306:
1307: if ($resource->contains_problem) {
1308: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1309: } else {
1310: @probs=($resource);
1311: }
1312: my $return;
1313: my %overallstatus;
1314: my $totalParts;
1315: foreach my $resource (@probs) {
1316: # If there is a single part, just show the simple status
1317: if ($resource->singlepart()) {
1318: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1319: $overallstatus{$status}++;
1320: $totalParts++;
1321: next;
1322: }
1323: # Now we can be sure the $part doesn't really matter.
1324: my $statusCount = $resource->simpleStatusCount();
1325: my @counts;
1326: foreach my $status (@statuses) {
1327: # decouple display order from the simpleStatusCount order
1328: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1329: if ($statusCount->[$slot]) {
1330: $overallstatus{$status}+=$statusCount->[$slot];
1331: $totalParts+=$statusCount->[$slot];
1332: }
1333: }
1334: }
1335: $return.= $td . $totalParts . ' parts: ';
1336: foreach my $status (@statuses) {
1337: if ($overallstatus{$status}) {
1338: $return.="<font color='" . $statusColors{$status} .
1339: "'>" . $overallstatus{$status} . ' '
1340: . $statusStrings{$status} . "</font>";
1341: }
1342: }
1343: $return.= $endtd;
1344: return $return;
1345: }
1346:
1347: my @preparedColumns = (\&render_resource, \&render_communication_status,
1348: \&render_quick_status, \&render_long_status,
1349: \&render_parts_summary_status);
1350:
1351: sub setDefault {
1352: my ($val, $default) = @_;
1353: if (!defined($val)) { return $default; }
1354: return $val;
1355: }
1356:
1357: sub cmp_title {
1358: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1359: $atitle=~s/^\s*//;
1360: $btitle=~s/^\s*//;
1361: return $atitle cmp $btitle;
1362: }
1363:
1364: sub render {
1365: my $args = shift;
1366: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1367: my $result = '';
1368: # Configure the renderer.
1369: my $cols = $args->{'cols'};
1370: if (!defined($cols)) {
1371: # no columns, no nav maps.
1372: return '';
1373: }
1374: my $mustCloseNavMap = 0;
1375: my $navmap;
1376: if (defined($args->{'navmap'})) {
1377: $navmap = $args->{'navmap'};
1378: }
1379:
1380: my $r = $args->{'r'};
1381: my $queryString = $args->{'queryString'};
1382: my $jump = $args->{'jump'};
1383: my $here = $args->{'here'};
1384: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1385: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1386: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1387: # before the current resource when using #current
1388:
1389: # If we were passed 'here' information, we are not rendering
1390: # after a folder manipulation, and we were not passed an
1391: # iterator, make sure we open the folders to show the "here"
1392: # marker
1393: my $filterHash = {};
1394: # Figure out what we're not displaying
1395: foreach (split(/\,/, $env{"form.filter"})) {
1396: if ($_) {
1397: $filterHash->{$_} = "1";
1398: }
1399: }
1400:
1401: # Filter: Remember filter function and add our own filter: Refuse
1402: # to show hidden resources unless the user can see them.
1403: my $userCanSeeHidden = advancedUser();
1404: my $filterFunc = setDefault($args->{'filterFunc'},
1405: sub {return 1;});
1406: if (!$userCanSeeHidden) {
1407: # Without renaming the filterfunc, the server seems to go into
1408: # an infinite loop
1409: my $oldFilterFunc = $filterFunc;
1410: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1411: &$oldFilterFunc($res);};
1412: }
1413:
1414: my $condition = 0;
1415: if ($env{'form.condition'}) {
1416: $condition = 1;
1417: }
1418:
1419: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1420: # Step 1: Check to see if we have a navmap
1421: if (!defined($navmap)) {
1422: $navmap = Apache::lonnavmaps::navmap->new();
1423: $mustCloseNavMap = 1;
1424: }
1425:
1426: # Step two: Locate what kind of here marker is necessary
1427: # Determine where the "here" marker is and where the screen jumps to.
1428:
1429: if ($env{'form.postsymb'}) {
1430: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1431: } elsif ($env{'form.postdata'}) {
1432: # couldn't find a symb, is there a URL?
1433: my $currenturl = $env{'form.postdata'};
1434: #$currenturl=~s/^http\:\/\///;
1435: #$currenturl=~s/^[^\/]+//;
1436:
1437: $here = $jump = &Apache::lonnet::symbread($currenturl);
1438: } else {
1439: my $last;
1440: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1441: &GDBM_READER(),0640)) {
1442: $last=$hash{'last_known'};
1443: untie(%hash);
1444: }
1445: if ($last) { $here = $jump = $last; }
1446: }
1447:
1448: # Step three: Ensure the folders are open
1449: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1450: my $curRes;
1451: my $found = 0;
1452:
1453: # We only need to do this if we need to open the maps to show the
1454: # current position. This will change the counter so we can't count
1455: # for the jump marker with this loop.
1456: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1457: if (ref($curRes) && $curRes->symb() eq $here) {
1458: my $mapStack = $mapIterator->getStack();
1459:
1460: # Ensure the parent maps are open
1461: for my $map (@{$mapStack}) {
1462: if ($condition) {
1463: undef $filterHash->{$map->map_pc()};
1464: } else {
1465: $filterHash->{$map->map_pc()} = 1;
1466: }
1467: }
1468: $found = 1;
1469: }
1470: }
1471: }
1472:
1473: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1474: # If this is a click on a folder or something, we want to preserve the "here"
1475: # from the querystring, and get the new "jump" marker
1476: $here = $env{'form.here'};
1477: $jump = $env{'form.jump'};
1478: }
1479:
1480: my $it = $args->{'iterator'};
1481: if (!defined($it)) {
1482: # Construct a default iterator based on $env{'form.'} information
1483:
1484: # Step 1: Check to see if we have a navmap
1485: if (!defined($navmap)) {
1486: $navmap = Apache::lonnavmaps::navmap->new();
1487: $mustCloseNavMap = 1;
1488: }
1489:
1490: # See if we're being passed a specific map
1491: if ($args->{'iterator_map'}) {
1492: my $map = $args->{'iterator_map'};
1493: $map = $navmap->getResourceByUrl($map);
1494: my $firstResource = $map->map_start();
1495: my $finishResource = $map->map_finish();
1496:
1497: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1498: } else {
1499: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1500: }
1501: }
1502:
1503: # (re-)Locate the jump point, if any
1504: # Note this does not take filtering or hidden into account... need
1505: # to be fixed?
1506: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1507: my $curRes;
1508: my $foundJump = 0;
1509: my $counter = 0;
1510:
1511: while (($curRes = $mapIterator->next()) && !$foundJump) {
1512: if (ref($curRes)) { $counter++; }
1513:
1514: if (ref($curRes) && $jump eq $curRes->symb()) {
1515:
1516: # This is why we have to use the main iterator instead of the
1517: # potentially faster DFS: The count has to be the same, so
1518: # the order has to be the same, which DFS won't give us.
1519: $args->{'currentJumpIndex'} = $counter;
1520: $foundJump = 1;
1521: }
1522: }
1523:
1524: my $showParts = setDefault($args->{'showParts'}, 1);
1525: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1526: # keeps track of when the current resource is found,
1527: # so we can back up a few and put the anchor above the
1528: # current resource
1529: my $printKey = $args->{'printKey'};
1530: my $printCloseAll = $args->{'printCloseAll'};
1531: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1532:
1533: # Print key?
1534: if ($printKey) {
1535: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1536: my $date=localtime;
1537: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1538: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1539: if ($navmap->{LAST_CHECK}) {
1540: $result .=
1541: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1542: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1543: '</td><td align="center" valign="bottom"> '.
1544: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1545: '</td>';
1546: } else {
1547: $result .= '<td align="center" valign="bottom"> '.
1548: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1549: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1550: '</td>';
1551: }
1552:
1553: $result .= '</tr></table>';
1554: }
1555:
1556: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1557: my ($link,$text);
1558: if ($condition) {
1559: $link='"navmaps?condition=0&filter=&'.$queryString.
1560: '&here='.&Apache::lonnet::escape($here).'"';
1561: $text='Close All Folders';
1562: } else {
1563: $link='"navmaps?condition=1&filter=&'.$queryString.
1564: '&here='.&Apache::lonnet::escape($here).'"';
1565: $text='Open All Folders';
1566: }
1567: if ($args->{'caller'} eq 'navmapsdisplay') {
1568: &add_linkitem($args->{'linkitems'},'changefolder',
1569: 'location.href='.$link,$text);
1570: } else {
1571: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1572: }
1573: $result .= "\n";
1574: }
1575:
1576: # Check for any unread discussions in all resources.
1577: if ($args->{'caller'} eq 'navmapsdisplay') {
1578: &add_linkitem($args->{'linkitems'},'clearbubbles',
1579: 'document.clearbubbles.submit()',
1580: 'Mark all posts read');
1581: my $time=time;
1582: $result .= (<<END);
1583: <form name="clearbubbles" method="post" action="/adm/feedback">
1584: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1585: <input type="hidden" name="navtime" value="$time" />
1586: END
1587: if ($args->{'sort'} eq 'discussion') {
1588: my $totdisc = 0;
1589: my $haveDisc = '';
1590: my @allres=$navmap->retrieveResources();
1591: foreach my $resource (@allres) {
1592: if ($resource->hasDiscussion()) {
1593: $haveDisc .= $resource->wrap_symb().':';
1594: $totdisc ++;
1595: }
1596: }
1597: if ($totdisc > 0) {
1598: $haveDisc =~ s/:$//;
1599: $result .= (<<END);
1600: <input type="hidden" name="navmaps" value="$haveDisc" />
1601: </form>
1602: END
1603: }
1604: }
1605: $result.='</form>';
1606: }
1607:
1608: if ($args->{'caller'} eq 'navmapsdisplay') {
1609: $result .= '<table><tr><td>'.
1610: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1611: if ($env{'environment.remotenavmap'} ne 'on') {
1612: $result .= '<td> </td>';
1613: } else {
1614: $result .= '</tr><tr>';
1615: }
1616: $result.=&show_linkitems($args->{'linkitems'});
1617: if ($args->{'sort_html'}) {
1618: if ($env{'environment.remotenavmap'} ne 'on') {
1619: $result.='<td> </td><td> </td><td> </td>'.
1620: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1621: } else {
1622: $result.='</tr><tr><td align="left"><br />'.
1623: $args->{'sort_html'}.'</td></tr>';
1624: }
1625: }
1626: $result .= '</table>';
1627: } elsif ($args->{'sort_html'}) {
1628: $result.=$args->{'sort_html'};
1629: }
1630:
1631: $result .= "<br />\n";
1632: if ($r) {
1633: $r->print($result);
1634: $r->rflush();
1635: $result = "";
1636: }
1637: # End parameter setting
1638:
1639: # Data
1640: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1641: my $res = "Apache::lonnavmaps::resource";
1642: my %condenseStatuses =
1643: ( $res->NETWORK_FAILURE => 1,
1644: $res->NOTHING_SET => 1,
1645: $res->CORRECT => 1 );
1646: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1647:
1648: # Shared variables
1649: $args->{'counter'} = 0; # counts the rows
1650: $args->{'indentLevel'} = 0;
1651: $args->{'isNewBranch'} = 0;
1652: $args->{'condensed'} = 0;
1653: my $location=
1654: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1655: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1656: $args->{'displayedHereMarker'} = 0;
1657:
1658: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1659: # since structure actually doesn't matter, except what map has what resources.
1660: if ($args->{'suppressEmptySequences'}) {
1661: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1662: $it->{FIRST_RESOURCE},
1663: $it->{FINISH_RESOURCE},
1664: {}, undef, 1);
1665: my $depth = 0;
1666: $dfsit->next();
1667: my $curRes = $dfsit->next();
1668: while ($depth > -1) {
1669: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1670: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1671:
1672: if (ref($curRes)) {
1673: # Parallel pre-processing: Do sequences have non-filtered-out children?
1674: if ($curRes->is_map()) {
1675: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1676: # Sequences themselves do not count as visible children,
1677: # unless those sequences also have visible children.
1678: # This means if a sequence appears, there's a "promise"
1679: # that there's something under it if you open it, somewhere.
1680: } else {
1681: # Not a sequence: if it's filtered, ignore it, otherwise
1682: # rise up the stack and mark the sequences as having children
1683: if (&$filterFunc($curRes)) {
1684: for my $sequence (@{$dfsit->getStack()}) {
1685: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1686: }
1687: }
1688: }
1689: }
1690: } continue {
1691: $curRes = $dfsit->next();
1692: }
1693: }
1694:
1695: my $displayedJumpMarker = 0;
1696: # Set up iteration.
1697: my $now = time();
1698: my $in24Hours = $now + 24 * 60 * 60;
1699: my $rownum = 0;
1700:
1701: # export "here" marker information
1702: $args->{'here'} = $here;
1703:
1704: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1705: my @resources;
1706: my $code='';# sub { !(shift->is_map();) };
1707: if ($args->{'sort'} eq 'title') {
1708: my $oldFilterFunc = $filterFunc;
1709: my $filterFunc=
1710: sub {
1711: my ($res)=@_;
1712: if ($res->is_map()) { return 0;}
1713: return &$oldFilterFunc($res);
1714: };
1715: @resources=$navmap->retrieveResources(undef,$filterFunc);
1716: @resources= sort { &cmp_title($a,$b) } @resources;
1717: } elsif ($args->{'sort'} eq 'duedate') {
1718: my $oldFilterFunc = $filterFunc;
1719: my $filterFunc=
1720: sub {
1721: my ($res)=@_;
1722: if (!$res->is_problem()) { return 0;}
1723: return &$oldFilterFunc($res);
1724: };
1725: @resources=$navmap->retrieveResources(undef,$filterFunc);
1726: @resources= sort {
1727: if ($a->duedate ne $b->duedate) {
1728: return $a->duedate cmp $b->duedate;
1729: }
1730: my $value=&cmp_title($a,$b);
1731: return $value;
1732: } @resources;
1733: } elsif ($args->{'sort'} eq 'discussion') {
1734: my $oldFilterFunc = $filterFunc;
1735: my $filterFunc=
1736: sub {
1737: my ($res)=@_;
1738: if (!$res->hasDiscussion() &&
1739: !$res->getFeedback() &&
1740: !$res->getErrors()) { return 0;}
1741: return &$oldFilterFunc($res);
1742: };
1743: @resources=$navmap->retrieveResources(undef,$filterFunc);
1744: @resources= sort { &cmp_title($a,$b) } @resources;
1745: } else {
1746: #unknow sort mechanism or default
1747: undef($args->{'sort'});
1748: }
1749:
1750:
1751: while (1) {
1752: if ($args->{'sort'}) {
1753: $curRes = shift(@resources);
1754: } else {
1755: $curRes = $it->next($closeAllPages);
1756: }
1757: if (!$curRes) { last; }
1758:
1759: # Maintain indentation level.
1760: if ($curRes == $it->BEGIN_MAP() ||
1761: $curRes == $it->BEGIN_BRANCH() ) {
1762: $args->{'indentLevel'}++;
1763: }
1764: if ($curRes == $it->END_MAP() ||
1765: $curRes == $it->END_BRANCH() ) {
1766: $args->{'indentLevel'}--;
1767: }
1768: # Notice new branches
1769: if ($curRes == $it->BEGIN_BRANCH()) {
1770: $args->{'isNewBranch'} = 1;
1771: }
1772:
1773: # If this isn't an actual resource, continue on
1774: if (!ref($curRes)) {
1775: next;
1776: }
1777:
1778: # If this has been filtered out, continue on
1779: if (!(&$filterFunc($curRes))) {
1780: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1781: next;
1782: }
1783:
1784: # If this is an empty sequence and we're filtering them, continue on
1785: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1786: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1787: next;
1788: }
1789:
1790: # If we're suppressing navmaps and this is a navmap, continue on
1791: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1792: next;
1793: }
1794:
1795: $args->{'counter'}++;
1796:
1797: # Does it have multiple parts?
1798: $args->{'multipart'} = 0;
1799: $args->{'condensed'} = 0;
1800: my @parts;
1801:
1802: # Decide what parts to show.
1803: if ($curRes->is_problem() && $showParts) {
1804: @parts = @{$curRes->parts()};
1805: $args->{'multipart'} = $curRes->multipart();
1806:
1807: if ($condenseParts) { # do the condensation
1808: if (!$curRes->opendate("0")) {
1809: @parts = ();
1810: $args->{'condensed'} = 1;
1811: }
1812: if (!$args->{'condensed'}) {
1813: # Decide whether to condense based on similarity
1814: my $status = $curRes->status($parts[0]);
1815: my $due = $curRes->duedate($parts[0]);
1816: my $open = $curRes->opendate($parts[0]);
1817: my $statusAllSame = 1;
1818: my $dueAllSame = 1;
1819: my $openAllSame = 1;
1820: for (my $i = 1; $i < scalar(@parts); $i++) {
1821: if ($curRes->status($parts[$i]) != $status){
1822: $statusAllSame = 0;
1823: }
1824: if ($curRes->duedate($parts[$i]) != $due ) {
1825: $dueAllSame = 0;
1826: }
1827: if ($curRes->opendate($parts[$i]) != $open) {
1828: $openAllSame = 0;
1829: }
1830: }
1831: # $*allSame is true if all the statuses were
1832: # the same. Now, if they are all the same and
1833: # match one of the statuses to condense, or they
1834: # are all open with the same due date, or they are
1835: # all OPEN_LATER with the same open date, display the
1836: # status of the first non-zero part (to get the 'correct'
1837: # status right, since 0 is never 'correct' or 'open').
1838: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1839: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1840: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1841: @parts = ($parts[0]);
1842: $args->{'condensed'} = 1;
1843: }
1844: }
1845: # Multipart problem with one part: always "condense" (happens
1846: # to match the desirable behavior)
1847: if ($curRes->countParts() == 1) {
1848: @parts = ($parts[0]);
1849: $args->{'condensed'} = 1;
1850: }
1851: }
1852: }
1853:
1854: # If the multipart problem was condensed, "forget" it was multipart
1855: if (scalar(@parts) == 1) {
1856: $args->{'multipart'} = 0;
1857: } else {
1858: # Add part 0 so we display it correctly.
1859: unshift @parts, '0';
1860: }
1861:
1862: {
1863: my ($src,$symb,$anchor,$stack);
1864: if ($args->{'sort'}) {
1865: my $it = $navmap->getIterator(undef, undef, undef, 1);
1866: while ( my $res=$it->next()) {
1867: if (ref($res) &&
1868: $res->symb() eq $curRes->symb()) { last; }
1869: }
1870: $stack=$it->getStack();
1871: } else {
1872: $stack=$it->getStack();
1873: }
1874: ($src,$symb,$anchor)=getLinkForResource($stack);
1875: if (defined($anchor)) { $anchor='#'.$anchor; }
1876: my $srcHasQuestion = $src =~ /\?/;
1877: $args->{"resourceLink"} = $src.
1878: ($srcHasQuestion?'&':'?') .
1879: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1880: }
1881: # Now, we've decided what parts to show. Loop through them and
1882: # show them.
1883: foreach my $part (@parts) {
1884: $rownum ++;
1885: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1886:
1887: $result .= " <tr bgcolor='$backgroundColor'>\n";
1888:
1889: # Set up some data about the parts that the cols might want
1890: my $filter = $it->{FILTER};
1891:
1892: # Now, display each column.
1893: foreach my $col (@$cols) {
1894: my $colHTML = '';
1895: if (ref($col)) {
1896: $colHTML .= &$col($curRes, $part, $args);
1897: } else {
1898: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1899: }
1900:
1901: # If this is the first column and it's time to print
1902: # the anchor, do so
1903: if ($col == $cols->[0] &&
1904: $args->{'counter'} == $args->{'currentJumpIndex'} -
1905: $currentJumpDelta) {
1906: # Jam the anchor after the <td> tag;
1907: # necessary for valid HTML (which Mozilla requires)
1908: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1909: $displayedJumpMarker = 1;
1910: }
1911: $result .= $colHTML . "\n";
1912: }
1913: $result .= " </tr>\n";
1914: $args->{'isNewBranch'} = 0;
1915: }
1916:
1917: if ($r && $rownum % 20 == 0) {
1918: $r->print($result);
1919: $result = "";
1920: $r->rflush();
1921: }
1922: } continue {
1923: if ($r) {
1924: # If we have the connection, make sure the user is still connected
1925: my $c = $r->connection;
1926: if ($c->aborted()) {
1927: # Who cares what we do, nobody will see it anyhow.
1928: return '';
1929: }
1930: }
1931: }
1932:
1933: # Print out the part that jumps to #curloc if it exists
1934: # delay needed because the browser is processing the jump before
1935: # it finishes rendering, so it goes to the wrong place!
1936: # onload might be better, but this routine has no access to that.
1937: # On mozilla, the 0-millisecond timeout seems to prevent this;
1938: # it's quite likely this might fix other browsers, too, and
1939: # certainly won't hurt anything.
1940: if ($displayedJumpMarker) {
1941: $result .= "
1942: <script>
1943: if (location.href.indexOf('#curloc')==-1) {
1944: setTimeout(\"location += '#curloc';\", 0)
1945: }
1946: </script>";
1947: }
1948:
1949: $result .= "</table>";
1950:
1951: if ($r) {
1952: $r->print($result);
1953: $result = "";
1954: $r->rflush();
1955: }
1956:
1957: return $result;
1958: }
1959:
1960: sub add_linkitem {
1961: my ($linkitems,$name,$cmd,$text)=@_;
1962: $$linkitems{$name}{'cmd'}=$cmd;
1963: $$linkitems{$name}{'text'}=&mt($text);
1964: }
1965:
1966: sub show_linkitems {
1967: my ($linkitems)=@_;
1968: my @linkorder = ("blank","launchnav","closenav","firsthomework",
1969: "everything","uncompleted","changefolder","clearbubbles");
1970:
1971: my $result .= (<<ENDBLOCK);
1972: <td align="left">
1973: <script type="text/javascript">
1974: function changeNavDisplay () {
1975: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1976: ENDBLOCK
1977: foreach my $link (@linkorder) {
1978: $result.= "if (navchoice == '$link') {".
1979: $linkitems->{$link}{'cmd'}."}\n";
1980: }
1981: $result.='}
1982: </script>
1983: <form name="linkitems" method="post">
1984: <nobr><select name="toplink">'."\n";
1985: foreach my $link (@linkorder) {
1986: if (defined($linkitems->{$link})) {
1987: if ($linkitems->{$link}{'text'} ne '') {
1988: $result .= ' <option value="'.$link.'">'.
1989: $linkitems->{$link}{'text'}."</option>\n";
1990: }
1991: }
1992: }
1993: $result .= '</select> <input type="button" name="chgnav"
1994: value="Go" onClick="javascript:changeNavDisplay()" />
1995: </nobr></form></td>'."\n";
1996:
1997: return $result;
1998: }
1999:
2000: 1;
2001:
2002: package Apache::lonnavmaps::navmap;
2003:
2004: =pod
2005:
2006: =head1 Object: Apache::lonnavmaps::navmap
2007:
2008: =head2 Overview
2009:
2010: The navmap object's job is to provide access to the resources
2011: in the course as Apache::lonnavmaps::resource objects, and to
2012: query and manage the relationship between those resource objects.
2013:
2014: Generally, you'll use the navmap object in one of three basic ways.
2015: In order of increasing complexity and power:
2016:
2017: =over 4
2018:
2019: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2020: various ways to obtain resource objects, based on various identifiers.
2021: Use this when you want to request information about one object or
2022: a handful of resources you already know the identities of, from some
2023: other source. For more about Ids, Symbs, and MapPcs, see the
2024: Resource documentation. Note that Url should be a B<last resort>,
2025: not your first choice; it only works when there is only one
2026: instance of the resource in the course, which only applies to
2027: maps, and even that may change in the future.
2028:
2029: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2030: retrieves resources matching some criterion and returns them
2031: in a flat array, with no structure information. Use this when
2032: you are manipulating a series of resources, based on what map
2033: the are in, but do not care about branching, or exactly how
2034: the maps and resources are related. This is the most common case.
2035:
2036: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2037: the course's navmap in various ways without writing the traversal
2038: code yourself. See iterator documentation below. Use this when
2039: you need to know absolutely everything about the course, including
2040: branches and the precise relationship between maps and resources.
2041:
2042: =back
2043:
2044: =head2 Creation And Destruction
2045:
2046: To create a navmap object, use the following function:
2047:
2048: =over 4
2049:
2050: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2051:
2052: Creates a new navmap object. Returns the navmap object if this is
2053: successful, or B<undef> if not.
2054:
2055: =back
2056:
2057: =head2 Methods
2058:
2059: =over 4
2060:
2061: =item * B<getIterator>(first, finish, filter, condition):
2062:
2063: See iterator documentation below.
2064:
2065: =cut
2066:
2067: use strict;
2068: use GDBM_File;
2069: use Apache::lonnet;
2070:
2071: sub new {
2072: # magic invocation to create a class instance
2073: my $proto = shift;
2074: my $class = ref($proto) || $proto;
2075: my $self = {};
2076:
2077: # Resource cache stores navmap resources as we reference them. We generate
2078: # them on-demand so we don't pay for creating resources unless we use them.
2079: $self->{RESOURCE_CACHE} = {};
2080:
2081: # Network failure flag, if we accessed the course or user opt and
2082: # failed
2083: $self->{NETWORK_FAILURE} = 0;
2084:
2085: # tie the nav hash
2086:
2087: my %navmaphash;
2088: my %parmhash;
2089: my $courseFn = $env{"request.course.fn"};
2090: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2091: &GDBM_READER(), 0640))) {
2092: return undef;
2093: }
2094:
2095: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2096: &GDBM_READER(), 0640)))
2097: {
2098: untie %{$self->{PARM_HASH}};
2099: return undef;
2100: }
2101:
2102: $self->{NAV_HASH} = \%navmaphash;
2103: $self->{PARM_HASH} = \%parmhash;
2104: $self->{PARM_CACHE} = {};
2105:
2106: bless($self);
2107:
2108: return $self;
2109: }
2110:
2111: sub generate_course_user_opt {
2112: my $self = shift;
2113: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2114:
2115: my $uname=$env{'user.name'};
2116: my $udom=$env{'user.domain'};
2117: my $cid=$env{'request.course.id'};
2118: my $cdom=$env{'course.'.$cid.'.domain'};
2119: my $cnum=$env{'course.'.$cid.'.num'};
2120:
2121: # ------------------------------------------------- Get coursedata (if present)
2122: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2123: # Check for network failure
2124: if (!ref($courseopt)) {
2125: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2126: $self->{NETWORK_FAILURE} = 1;
2127: }
2128: undef($courseopt);
2129: }
2130:
2131: # --------------------------------------------------- Get userdata (if present)
2132:
2133: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2134: # Check for network failure
2135: if (!ref($useropt)) {
2136: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2137: $self->{NETWORK_FAILURE} = 1;
2138: }
2139: undef($useropt);
2140: }
2141:
2142: $self->{COURSE_OPT} = $courseopt;
2143: $self->{USER_OPT} = $useropt;
2144:
2145: $self->{COURSE_USER_OPT_GENERATED} = 1;
2146:
2147: return;
2148: }
2149:
2150: sub generate_email_discuss_status {
2151: my $self = shift;
2152: my $symb = shift;
2153: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2154:
2155: my $cid=$env{'request.course.id'};
2156: my $cdom=$env{'course.'.$cid.'.domain'};
2157: my $cnum=$env{'course.'.$cid.'.num'};
2158:
2159: my %emailstatus = &Apache::lonnet::dump('email_status');
2160: my $logoutTime = $emailstatus{'logout'};
2161: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2162: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2163: $courseLeaveTime : $logoutTime);
2164: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2165: $cdom, $cnum);
2166: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2167: $env{'user.domain'},$env{'user.name'},'lastread');
2168: my %lastreadtime = ();
2169: foreach (keys %lastread) {
2170: my $key = $_;
2171: $key =~ s/_lastread$//;
2172: $lastreadtime{$key} = $lastread{$_};
2173: }
2174:
2175: my %feedback=();
2176: my %error=();
2177: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2178: $env{'user.name'});
2179:
2180: foreach my $msgid (@keys) {
2181: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2182: my $plain=
2183: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2184: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2185: my ($what,$url)=($1,$2);
2186: if ($what eq 'Error') {
2187: $error{$url}.=','.$msgid;
2188: } else {
2189: $feedback{$url}.=','.$msgid;
2190: }
2191: }
2192: }
2193: }
2194:
2195: #url's of resources that have feedbacks
2196: $self->{FEEDBACK} = \%feedback;
2197: #or errors
2198: $self->{ERROR_MSG} = \%error;
2199: $self->{DISCUSSION_TIME} = \%discussiontime;
2200: $self->{EMAIL_STATUS} = \%emailstatus;
2201: $self->{LAST_READ} = \%lastreadtime;
2202:
2203: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2204: }
2205:
2206: sub get_user_data {
2207: my $self = shift;
2208: if ($self->{RETRIEVED_USER_DATA}) { return; }
2209:
2210: # Retrieve performance data on problems
2211: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2212: $env{'user.domain'},
2213: $env{'user.name'});
2214: $self->{STUDENT_DATA} = \%student_data;
2215:
2216: $self->{RETRIEVED_USER_DATA} = 1;
2217: }
2218:
2219: # Internal function: Takes a key to look up in the nav hash and implements internal
2220: # memory caching of that key.
2221: sub navhash {
2222: my $self = shift; my $key = shift;
2223: return $self->{NAV_HASH}->{$key};
2224: }
2225:
2226: =pod
2227:
2228: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2229: false otherwise. Undefined course maps indicate an error somewhere in
2230: LON-CAPA, and you will not be able to proceed with using the navmap.
2231: See the B<NAV> screen for an example of using this.
2232:
2233: =cut
2234:
2235: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2236: sub courseMapDefined {
2237: my $self = shift;
2238: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2239:
2240: my $firstres = $self->navhash("map_start_$uri");
2241: my $lastres = $self->navhash("map_finish_$uri");
2242: return $firstres && $lastres;
2243: }
2244:
2245: sub getIterator {
2246: my $self = shift;
2247: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2248: shift, undef, shift,
2249: shift, shift);
2250: return $iterator;
2251: }
2252:
2253: # Private method: Does the given resource (as a symb string) have
2254: # current discussion? Returns 0 if chat/mail data not extracted.
2255: sub hasDiscussion {
2256: my $self = shift;
2257: my $symb = shift;
2258: $self->generate_email_discuss_status();
2259:
2260: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2261:
2262: #return defined($self->{DISCUSSION_TIME}->{$symb});
2263:
2264: # backward compatibility (bulletin boards used to be 'wrapped')
2265: my $ressymb = $self->wrap_symb($symb);
2266: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2267: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2268: } else {
2269: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2270: 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).
2271: }
2272: }
2273:
2274: sub wrap_symb {
2275: my $self = shift;
2276: my $symb = shift;
2277: if ($symb =~ m-___(adm/\w+/\w+/)(\d+)(/bulletinboard)$-) {
2278: unless ($symb =~ m|adm/wrapper/adm|) {
2279: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2280: }
2281: }
2282: return $symb;
2283: }
2284:
2285: # Private method: Does the given resource (as a symb string) have
2286: # current feedback? Returns the string in the feedback hash, which
2287: # will be false if it does not exist.
2288:
2289: sub getFeedback {
2290: my $self = shift;
2291: my $symb = shift;
2292:
2293: $self->generate_email_discuss_status();
2294:
2295: if (!defined($self->{FEEDBACK})) { return ""; }
2296:
2297: return $self->{FEEDBACK}->{$symb};
2298: }
2299:
2300: # Private method: Get the errors for that resource (by source).
2301: sub getErrors {
2302: my $self = shift;
2303: my $src = shift;
2304:
2305: $self->generate_email_discuss_status();
2306:
2307: if (!defined($self->{ERROR_MSG})) { return ""; }
2308: return $self->{ERROR_MSG}->{$src};
2309: }
2310:
2311: =pod
2312:
2313: =item * B<getById>(id):
2314:
2315: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2316: object for that resource. This method, or other methods that use it
2317: (as in the resource object) is the only proper way to obtain a
2318: resource object.
2319:
2320: =item * B<getBySymb>(symb):
2321:
2322: Based on the symb of the resource, get a resource object for that
2323: resource. This is one of the proper ways to get a resource object.
2324:
2325: =item * B<getMapByMapPc>(map_pc):
2326:
2327: Based on the map_pc of the resource, get a resource object for
2328: the given map. This is one of the proper ways to get a resource object.
2329:
2330: =cut
2331:
2332: # The strategy here is to cache the resource objects, and only construct them
2333: # as we use them. The real point is to prevent reading any more from the tied
2334: # hash then we have to, which should hopefully alleviate speed problems.
2335:
2336: sub getById {
2337: my $self = shift;
2338: my $id = shift;
2339:
2340: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2341: {
2342: return $self->{RESOURCE_CACHE}->{$id};
2343: }
2344:
2345: # resource handles inserting itself into cache.
2346: # Not clear why the quotes are necessary, but as of this
2347: # writing it doesn't work without them.
2348: return "Apache::lonnavmaps::resource"->new($self, $id);
2349: }
2350:
2351: sub getBySymb {
2352: my $self = shift;
2353: my $symb = shift;
2354:
2355: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2356: my $map = $self->getResourceByUrl($mapUrl);
2357: my $returnvalue = undef;
2358: if (ref($map)) {
2359: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2360: }
2361: return $returnvalue;
2362: }
2363:
2364: sub getByMapPc {
2365: my $self = shift;
2366: my $map_pc = shift;
2367: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2368: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2369: return $self->getById($map_id);
2370: }
2371:
2372: =pod
2373:
2374: =item * B<firstResource>():
2375:
2376: Returns a resource object reference corresponding to the first
2377: resource in the navmap.
2378:
2379: =cut
2380:
2381: sub firstResource {
2382: my $self = shift;
2383: my $firstResource = $self->navhash('map_start_' .
2384: &Apache::lonnet::clutter($env{'request.course.uri'}));
2385: return $self->getById($firstResource);
2386: }
2387:
2388: =pod
2389:
2390: =item * B<finishResource>():
2391:
2392: Returns a resource object reference corresponding to the last resource
2393: in the navmap.
2394:
2395: =cut
2396:
2397: sub finishResource {
2398: my $self = shift;
2399: my $firstResource = $self->navhash('map_finish_' .
2400: &Apache::lonnet::clutter($env{'request.course.uri'}));
2401: return $self->getById($firstResource);
2402: }
2403:
2404: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2405: # the actual lookup; parmval caches the results.
2406: sub parmval {
2407: my $self = shift;
2408: my ($what,$symb)=@_;
2409: my $hashkey = $what."|||".$symb;
2410:
2411: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2412: return $self->{PARM_CACHE}->{$hashkey};
2413: }
2414:
2415: my $result = $self->parmval_real($what, $symb);
2416: $self->{PARM_CACHE}->{$hashkey} = $result;
2417: return $result;
2418: }
2419:
2420: sub parmval_real {
2421: my $self = shift;
2422: my ($what,$symb,$recurse) = @_;
2423:
2424: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2425: $self->generate_course_user_opt();
2426:
2427: my $cid=$env{'request.course.id'};
2428: my $csec=$env{'request.course.sec'};
2429: my $uname=$env{'user.name'};
2430: my $udom=$env{'user.domain'};
2431:
2432: unless ($symb) { return ''; }
2433: my $result='';
2434:
2435: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2436:
2437: # ----------------------------------------------------- Cascading lookup scheme
2438: my $rwhat=$what;
2439: $what=~s/^parameter\_//;
2440: $what=~s/\_/\./;
2441:
2442: my $symbparm=$symb.'.'.$what;
2443: my $mapparm=$mapname.'___(all).'.$what;
2444: my $usercourseprefix=$cid;
2445:
2446: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2447: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2448: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2449:
2450: my $courselevel= $usercourseprefix.'.'.$what;
2451: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2452: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2453:
2454: my $useropt = $self->{USER_OPT};
2455: my $courseopt = $self->{COURSE_OPT};
2456: my $parmhash = $self->{PARM_HASH};
2457:
2458: # ---------------------------------------------------------- first, check user
2459: if ($uname and defined($useropt)) {
2460: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2461: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2462: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2463: }
2464:
2465: # ------------------------------------------------------- second, check course
2466: if ($csec and defined($courseopt)) {
2467: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2468: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2469: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2470: }
2471:
2472: if (defined($courseopt)) {
2473: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2474: }
2475:
2476: # ----------------------------------------------------- third, check map parms
2477:
2478: my $thisparm=$$parmhash{$symbparm};
2479: if (defined($thisparm)) { return $thisparm; }
2480:
2481: # ----------------------------------------------------- fourth , check default
2482:
2483: my $meta_rwhat=$rwhat;
2484: $meta_rwhat=~s/\./_/g;
2485: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2486: if (defined($default)) { return $default}
2487: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2488: if (defined($default)) { return $default}
2489:
2490: # --------------------------------------------------- fifth, check more course
2491: if (defined($courseopt)) {
2492: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2493: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2494: }
2495:
2496: # --------------------------------------------------- sixth , cascade up parts
2497:
2498: my ($space,@qualifier)=split(/\./,$rwhat);
2499: my $qualifier=join('.',@qualifier);
2500: unless ($space eq '0') {
2501: my @parts=split(/_/,$space);
2502: my $id=pop(@parts);
2503: my $part=join('_',@parts);
2504: if ($part eq '') { $part='0'; }
2505: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2506: if (defined($partgeneral)) { return $partgeneral; }
2507: }
2508: if ($recurse) { return undef; }
2509: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2510: if (defined($pack_def)) { return $pack_def; }
2511: return '';
2512: }
2513:
2514: =pod
2515:
2516: =item * B<getResourceByUrl>(url):
2517:
2518: Retrieves a resource object by URL of the resource. If passed a
2519: resource object, it will simply return it, so it is safe to use this
2520: method in code like "$res = $navmap->getResourceByUrl($res)", if
2521: you're not sure if $res is already an object, or just a URL. If the
2522: resource appears multiple times in the course, only the first instance
2523: will be returned. As a result, this is probably useful only for maps.
2524:
2525: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2526:
2527: The map is a specification of a map to retreive the resources from,
2528: either as a url or as an object. The filterFunc is a reference to a
2529: function that takes a resource object as its one argument and returns
2530: true if the resource should be included, or false if it should not
2531: be. If recursive is true, the map will be recursively examined,
2532: otherwise it will not be. If bailout is true, the function will return
2533: as soon as it finds a resource, if false it will finish. If showall is
2534: true it will not hide maps that contain nothing but one other map. By
2535: default, the map is the top-level map of the course, filterFunc is a
2536: function that always returns 1, recursive is true, bailout is false,
2537: showall is false. The resources will be returned in a list containing
2538: the resource objects for the corresponding resources, with B<no
2539: structure information> in the list; regardless of branching,
2540: recursion, etc., it will be a flat list.
2541:
2542: Thus, this is suitable for cases where you don't want the structure,
2543: just a list of all resources. It is also suitable for finding out how
2544: many resources match a given description; for this use, if all you
2545: want to know is if I<any> resources match the description, the bailout
2546: parameter will allow you to avoid potentially expensive enumeration of
2547: all matching resources.
2548:
2549: =item * B<hasResource>(map, filterFunc, recursive, showall):
2550:
2551: Convience method for
2552:
2553: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2554:
2555: which will tell whether the map has resources matching the description
2556: in the filter function.
2557:
2558: =cut
2559:
2560:
2561: sub getResourceByUrl {
2562: my $self = shift;
2563: my $resUrl = shift;
2564:
2565: if (ref($resUrl)) { return $resUrl; }
2566:
2567: $resUrl = &Apache::lonnet::clutter($resUrl);
2568: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2569: if ($resId =~ /,/) {
2570: $resId = (split (/,/, $resId))[0];
2571: }
2572: if (!$resId) { return ''; }
2573: return $self->getById($resId);
2574: }
2575:
2576: sub retrieveResources {
2577: my $self = shift;
2578: my $map = shift;
2579: my $filterFunc = shift;
2580: if (!defined ($filterFunc)) {
2581: $filterFunc = sub {return 1;};
2582: }
2583: my $recursive = shift;
2584: if (!defined($recursive)) { $recursive = 1; }
2585: my $bailout = shift;
2586: if (!defined($bailout)) { $bailout = 0; }
2587: my $showall = shift;
2588: # Create the necessary iterator.
2589: if (!ref($map)) { # assume it's a url of a map.
2590: $map = $self->getResourceByUrl($map);
2591: }
2592:
2593: # If nothing was passed, assume top-level map
2594: if (!$map) {
2595: $map = $self->getById('0.0');
2596: }
2597:
2598: # Check the map's validity.
2599: if (!$map->is_map()) {
2600: # Oh, to throw an exception.... how I'd love that!
2601: return ();
2602: }
2603:
2604: # Get an iterator.
2605: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2606: undef, $recursive, $showall);
2607:
2608: my @resources = ();
2609:
2610: # Run down the iterator and collect the resources.
2611: my $curRes;
2612:
2613: while ($curRes = $it->next()) {
2614: if (ref($curRes)) {
2615: if (!&$filterFunc($curRes)) {
2616: next;
2617: }
2618:
2619: push @resources, $curRes;
2620:
2621: if ($bailout) {
2622: return @resources;
2623: }
2624: }
2625:
2626: }
2627:
2628: return @resources;
2629: }
2630:
2631: sub hasResource {
2632: my $self = shift;
2633: my $map = shift;
2634: my $filterFunc = shift;
2635: my $recursive = shift;
2636: my $showall = shift;
2637:
2638: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2639: }
2640:
2641: 1;
2642:
2643: package Apache::lonnavmaps::iterator;
2644: use WeakRef;
2645: use Apache::lonnet;
2646:
2647: =pod
2648:
2649: =back
2650:
2651: =head1 Object: navmap Iterator
2652:
2653: An I<iterator> encapsulates the logic required to traverse a data
2654: structure. navmap uses an iterator to traverse the course map
2655: according to the criteria you wish to use.
2656:
2657: To obtain an iterator, call the B<getIterator>() function of a
2658: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2659: directly.) This will return a reference to the iterator:
2660:
2661: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2662:
2663: To get the next thing from the iterator, call B<next>:
2664:
2665: C<my $nextThing = $resourceIterator-E<gt>next()>
2666:
2667: getIterator behaves as follows:
2668:
2669: =over 4
2670:
2671: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2672:
2673: All parameters are optional. firstResource is a resource reference
2674: corresponding to where the iterator should start. It defaults to
2675: navmap->firstResource() for the corresponding nav map. finishResource
2676: corresponds to where you want the iterator to end, defaulting to
2677: navmap->finishResource(). filterHash is a hash used as a set
2678: containing strings representing the resource IDs, defaulting to
2679: empty. Condition is a 1 or 0 that sets what to do with the filter
2680: hash: If a 0, then only resources that exist IN the filterHash will be
2681: recursed on. If it is a 1, only resources NOT in the filterHash will
2682: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2683: false (default), the iterator will only return the first level of map
2684: that is not just a single, 'redirecting' map. If true, the iterator
2685: will return all information, starting with the top-level map,
2686: regardless of content. returnTopMap, if true (default false), will
2687: cause the iterator to return the top-level map object (resource 0.0)
2688: before anything else.
2689:
2690: Thus, by default, only top-level resources will be shown. Change the
2691: condition to a 1 without changing the hash, and all resources will be
2692: shown. Changing the condition to 1 and including some values in the
2693: hash will allow you to selectively suppress parts of the navmap, while
2694: leaving it on 0 and adding things to the hash will allow you to
2695: selectively add parts of the nav map. See the handler code for
2696: examples.
2697:
2698: The iterator will return either a reference to a resource object, or a
2699: token representing something in the map, such as the beginning of a
2700: new branch. The possible tokens are:
2701:
2702: =over 4
2703:
2704: =item * B<END_ITERATOR>:
2705:
2706: The iterator has returned all that it's going to. Further calls to the
2707: iterator will just produce more of these. This is a "false" value, and
2708: is the only false value the iterator which will be returned, so it can
2709: be used as a loop sentinel.
2710:
2711: =item * B<BEGIN_MAP>:
2712:
2713: A new map is being recursed into. This is returned I<after> the map
2714: resource itself is returned.
2715:
2716: =item * B<END_MAP>:
2717:
2718: The map is now done.
2719:
2720: =item * B<BEGIN_BRANCH>:
2721:
2722: A branch is now starting. The next resource returned will be the first
2723: in that branch.
2724:
2725: =item * B<END_BRANCH>:
2726:
2727: The branch is now done.
2728:
2729: =back
2730:
2731: The tokens are retreivable via methods on the iterator object, i.e.,
2732: $iterator->END_MAP.
2733:
2734: Maps can contain empty resources. The iterator will automatically skip
2735: over such resources, but will still treat the structure
2736: correctly. Thus, a complicated map with several branches, but
2737: consisting entirely of empty resources except for one beginning or
2738: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2739: but only one resource will be returned.
2740:
2741: =back
2742:
2743: =head2 Normal Usage
2744:
2745: Normal usage of the iterator object is to do the following:
2746:
2747: my $it = $navmap->getIterator([your params here]);
2748: my $curRes;
2749: while ($curRes = $it->next()) {
2750: [your logic here]
2751: }
2752:
2753: Note that inside of the loop, it's frequently useful to check if
2754: "$curRes" is a reference or not with the reference function; only
2755: resource objects will be references, and any non-references will
2756: be the tokens described above.
2757:
2758: Also note there is some old code floating around that trys to track
2759: the depth of the iterator to see when it's done; do not copy that
2760: code. It is difficult to get right and harder to understand then
2761: this. They should be migrated to this new style.
2762:
2763: =cut
2764:
2765: # Here are the tokens for the iterator:
2766:
2767: sub END_ITERATOR { return 0; }
2768: sub BEGIN_MAP { return 1; } # begining of a new map
2769: sub END_MAP { return 2; } # end of the map
2770: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2771: sub END_BRANCH { return 4; } # end of a branch
2772: sub FORWARD { return 1; } # go forward
2773: sub BACKWARD { return 2; }
2774:
2775: sub min {
2776: (my $a, my $b) = @_;
2777: if ($a < $b) { return $a; } else { return $b; }
2778: }
2779:
2780: sub new {
2781: # magic invocation to create a class instance
2782: my $proto = shift;
2783: my $class = ref($proto) || $proto;
2784: my $self = {};
2785:
2786: weaken($self->{NAV_MAP} = shift);
2787: return undef unless ($self->{NAV_MAP});
2788:
2789: # Handle the parameters
2790: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2791: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2792:
2793: # If the given resources are just the ID of the resource, get the
2794: # objects
2795: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2796: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2797: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2798: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2799:
2800: $self->{FILTER} = shift;
2801:
2802: # A hash, used as a set, of resource already seen
2803: $self->{ALREADY_SEEN} = shift;
2804: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2805: $self->{CONDITION} = shift;
2806:
2807: # Do we want to automatically follow "redirection" maps?
2808: $self->{FORCE_TOP} = shift;
2809:
2810: # Do we want to return the top-level map object (resource 0.0)?
2811: $self->{RETURN_0} = shift;
2812: # have we done that yet?
2813: $self->{HAVE_RETURNED_0} = 0;
2814:
2815: # Now, we need to pre-process the map, by walking forward and backward
2816: # over the parts of the map we're going to look at.
2817:
2818: # The processing steps are exactly the same, except for a few small
2819: # changes, so I bundle those up in the following list of two elements:
2820: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2821: # first_resource).
2822: # This prevents writing nearly-identical code twice.
2823: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2824: 'FIRST_RESOURCE'],
2825: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2826: 'FINISH_RESOURCE'] );
2827:
2828: my $maxDepth = 0; # tracks max depth
2829:
2830: # If there is only one resource in this map, and it's a map, we
2831: # want to remember that, so the user can ask for the first map
2832: # that isn't just a redirector.
2833: my $resource; my $resourceCount = 0;
2834:
2835: # Documentation on this algorithm can be found in the CVS repository at
2836: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2837: # in that file.
2838: # **1**
2839:
2840: foreach my $pass (@iterations) {
2841: my $direction = $pass->[0];
2842: my $valName = $pass->[1];
2843: my $nextResourceMethod = $pass->[2];
2844: my $firstResourceName = $pass->[3];
2845:
2846: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2847: $self->{FIRST_RESOURCE},
2848: $self->{FINISH_RESOURCE},
2849: {}, undef, 0, $direction);
2850:
2851: # prime the recursion
2852: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2853: $iterator->next();
2854: my $curRes = $iterator->next();
2855: my $depth = 1;
2856: while ($depth > 0) {
2857: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2858: if ($curRes == $iterator->END_MAP()) { $depth--; }
2859:
2860: if (ref($curRes)) {
2861: # If there's only one resource, this will save it
2862: # we have to filter empty resources from consideration here,
2863: # or even "empty", redirecting maps have two (start & finish)
2864: # or three (start, finish, plus redirector)
2865: if($direction == FORWARD && $curRes->src()) {
2866: $resource = $curRes; $resourceCount++;
2867: }
2868: my $resultingVal = $curRes->{DATA}->{$valName};
2869: my $nextResources = $curRes->$nextResourceMethod();
2870: my $nextCount = scalar(@{$nextResources});
2871:
2872: if ($nextCount == 1) { # **3**
2873: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2874: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2875: }
2876:
2877: if ($nextCount > 1) { # **4**
2878: foreach my $res (@{$nextResources}) {
2879: my $current = $res->{DATA}->{$valName} || 999999999;
2880: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2881: }
2882: }
2883: }
2884:
2885: # Assign the final val (**2**)
2886: if (ref($curRes) && $direction == BACKWARD()) {
2887: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2888: $curRes->{DATA}->{BOT_UP_VAL});
2889:
2890: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2891: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2892: }
2893:
2894: $curRes = $iterator->next();
2895: }
2896: }
2897:
2898: # Check: Was this only one resource, a map?
2899: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2900: my $firstResource = $resource->map_start();
2901: my $finishResource = $resource->map_finish();
2902: return
2903: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2904: $finishResource, $self->{FILTER},
2905: $self->{ALREADY_SEEN},
2906: $self->{CONDITION},
2907: $self->{FORCE_TOP});
2908:
2909: }
2910:
2911: # Set up some bookkeeping information.
2912: $self->{CURRENT_DEPTH} = 0;
2913: $self->{MAX_DEPTH} = $maxDepth;
2914: $self->{STACK} = [];
2915: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2916: $self->{FINISHED} = 0; # When true, the iterator has finished
2917:
2918: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2919: push @{$self->{STACK}}, [];
2920: }
2921:
2922: # Prime the recursion w/ the first resource **5**
2923: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2924: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2925:
2926: bless ($self);
2927:
2928: return $self;
2929: }
2930:
2931: sub next {
2932: my $self = shift;
2933: my $closeAllPages=shift;
2934: if ($self->{FINISHED}) {
2935: return END_ITERATOR();
2936: }
2937:
2938: # If we want to return the top-level map object, and haven't yet,
2939: # do so.
2940: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2941: $self->{HAVE_RETURNED_0} = 1;
2942: return $self->{NAV_MAP}->getById('0.0');
2943: }
2944:
2945: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2946: # grab the next from the recursive iterator
2947: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2948:
2949: # is it a begin or end map? If so, update the depth
2950: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2951: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2952:
2953: # Are we back at depth 0? If so, stop recursing
2954: if ($self->{RECURSIVE_DEPTH} == 0) {
2955: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2956: }
2957:
2958: return $next;
2959: }
2960:
2961: if (defined($self->{FORCE_NEXT})) {
2962: my $tmp = $self->{FORCE_NEXT};
2963: $self->{FORCE_NEXT} = undef;
2964: return $tmp;
2965: }
2966:
2967: # Have we not yet begun? If not, return BEGIN_MAP and
2968: # remember we've started.
2969: if ( !$self->{STARTED} ) {
2970: $self->{STARTED} = 1;
2971: return $self->BEGIN_MAP();
2972: }
2973:
2974: # Here's the guts of the iterator.
2975:
2976: # Find the next resource, if any.
2977: my $found = 0;
2978: my $i = $self->{MAX_DEPTH};
2979: my $newDepth;
2980: my $here;
2981: while ( $i >= 0 && !$found ) {
2982: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2983: $here = pop @{$self->{STACK}->[$i]}; # **7**
2984: $found = 1;
2985: $newDepth = $i;
2986: }
2987: $i--;
2988: }
2989:
2990: # If we still didn't find anything, we're done.
2991: if ( !$found ) {
2992: # We need to get back down to the correct branch depth
2993: if ( $self->{CURRENT_DEPTH} > 0 ) {
2994: $self->{CURRENT_DEPTH}--;
2995: return END_BRANCH();
2996: } else {
2997: $self->{FINISHED} = 1;
2998: return END_MAP();
2999: }
3000: }
3001:
3002: # If this is not a resource, it must be an END_BRANCH marker we want
3003: # to return directly.
3004: if (!ref($here)) { # **8**
3005: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3006: $self->{CURRENT_DEPTH}--;
3007: return $here;
3008: }
3009: }
3010:
3011: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3012: $self->{HERE} = $here;
3013:
3014: # Get to the right level
3015: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3016: push @{$self->{STACK}->[$newDepth]}, $here;
3017: $self->{CURRENT_DEPTH}--;
3018: return END_BRANCH();
3019: }
3020: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3021: push @{$self->{STACK}->[$newDepth]}, $here;
3022: $self->{CURRENT_DEPTH}++;
3023: return BEGIN_BRANCH();
3024: }
3025:
3026: # If we made it here, we have the next resource, and we're at the
3027: # right branch level. So let's examine the resource for where
3028: # we can get to from here.
3029:
3030: # So we need to look at all the resources we can get to from here,
3031: # categorize them if we haven't seen them, remember if we have a new
3032: my $nextUnfiltered = $here->getNext();
3033: my $maxDepthAdded = -1;
3034:
3035: for (@$nextUnfiltered) {
3036: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3037: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3038: push @{$self->{STACK}->[$depth]}, $_;
3039: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3040: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3041: }
3042: }
3043:
3044: # Is this the end of a branch? If so, all of the resources examined above
3045: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3046: # marker onto the stack so we don't forget.
3047: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3048: # BC branch and gets to C, it will see F as the only next resource, but it's
3049: # one level lower. Thus, this is the end of the branch, since there are no
3050: # more resources added to this level or above.
3051: # We don't do this if the examined resource is the finish resource,
3052: # because the condition given above is true, but the "END_MAP" will
3053: # take care of things and we should already be at depth 0.
3054: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3055: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3056: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3057: }
3058:
3059: # That ends the main iterator logic. Now, do we want to recurse
3060: # down this map (if this resource is a map)?
3061: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3062: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3063: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3064: my $firstResource = $self->{HERE}->map_start();
3065: my $finishResource = $self->{HERE}->map_finish();
3066:
3067: $self->{RECURSIVE_ITERATOR} =
3068: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3069: $finishResource, $self->{FILTER},
3070: $self->{ALREADY_SEEN},
3071: $self->{CONDITION},
3072: $self->{FORCE_TOP});
3073: }
3074:
3075: # If this is a blank resource, don't actually return it.
3076: # Should you ever find you need it, make sure to add an option to the code
3077: # that you can use; other things depend on this behavior.
3078: my $browsePriv = $self->{HERE}->browsePriv();
3079: if (!$self->{HERE}->src() ||
3080: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3081: return $self->next($closeAllPages);
3082: }
3083:
3084: return $self->{HERE};
3085:
3086: }
3087:
3088: =pod
3089:
3090: The other method available on the iterator is B<getStack>, which
3091: returns an array populated with the current 'stack' of maps, as
3092: references to the resource objects. Example: This is useful when
3093: making the navigation map, as we need to check whether we are under a
3094: page map to see if we need to link directly to the resource, or to the
3095: page. The first elements in the array will correspond to the top of
3096: the stack (most inclusive map).
3097:
3098: =cut
3099:
3100: sub getStack {
3101: my $self=shift;
3102:
3103: my @stack;
3104:
3105: $self->populateStack(\@stack);
3106:
3107: return \@stack;
3108: }
3109:
3110: # Private method: Calls the iterators recursively to populate the stack.
3111: sub populateStack {
3112: my $self=shift;
3113: my $stack = shift;
3114:
3115: push @$stack, $self->{HERE} if ($self->{HERE});
3116:
3117: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3118: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3119: }
3120: }
3121:
3122: 1;
3123:
3124: package Apache::lonnavmaps::DFSiterator;
3125: use WeakRef;
3126: use Apache::lonnet;
3127:
3128: # Not documented in the perldoc: This is a simple iterator that just walks
3129: # through the nav map and presents the resources in a depth-first search
3130: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3131: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3132: # useful for pre-processing of some kind, and is in fact used by the main
3133: # iterator that way, but that's about it.
3134: # One could imagine merging this into the init routine of the main iterator,
3135: # but this might as well be left separate, since it is possible some other
3136: # use might be found for it. - Jeremy
3137:
3138: # Unlike the main iterator, this DOES return all resources, even blank ones.
3139: # The main iterator needs them to correctly preprocess the map.
3140:
3141: sub BEGIN_MAP { return 1; } # begining of a new map
3142: sub END_MAP { return 2; } # end of the map
3143: sub FORWARD { return 1; } # go forward
3144: sub BACKWARD { return 2; }
3145:
3146: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3147: # filter hash ref (or undef), already seen hash or undef, condition
3148: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3149: sub new {
3150: # magic invocation to create a class instance
3151: my $proto = shift;
3152: my $class = ref($proto) || $proto;
3153: my $self = {};
3154:
3155: weaken($self->{NAV_MAP} = shift);
3156: return undef unless ($self->{NAV_MAP});
3157:
3158: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3159: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3160:
3161: # If the given resources are just the ID of the resource, get the
3162: # objects
3163: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3164: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3165: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3166: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3167:
3168: $self->{FILTER} = shift;
3169:
3170: # A hash, used as a set, of resource already seen
3171: $self->{ALREADY_SEEN} = shift;
3172: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3173: $self->{CONDITION} = shift;
3174: $self->{DIRECTION} = shift || FORWARD();
3175:
3176: # Flag: Have we started yet?
3177: $self->{STARTED} = 0;
3178:
3179: # Should we continue calling the recursive iterator, if any?
3180: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3181: # The recursive iterator, if any
3182: $self->{RECURSIVE_ITERATOR} = undef;
3183: # Are we recursing on a map, or a branch?
3184: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3185: # And the count of how deep it is, so that this iterator can keep track of
3186: # when to pick back up again.
3187: $self->{RECURSIVE_DEPTH} = 0;
3188:
3189: # For keeping track of our branches, we maintain our own stack
3190: $self->{STACK} = [];
3191:
3192: # Start with the first resource
3193: if ($self->{DIRECTION} == FORWARD) {
3194: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3195: } else {
3196: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3197: }
3198:
3199: bless($self);
3200: return $self;
3201: }
3202:
3203: sub next {
3204: my $self = shift;
3205:
3206: # Are we using a recursive iterator? If so, pull from that and
3207: # watch the depth; we want to resume our level at the correct time.
3208: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3209: # grab the next from the recursive iterator
3210: my $next = $self->{RECURSIVE_ITERATOR}->next();
3211:
3212: # is it a begin or end map? Update depth if so
3213: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3214: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3215:
3216: # Are we back at depth 0? If so, stop recursing.
3217: if ($self->{RECURSIVE_DEPTH} == 0) {
3218: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3219: }
3220:
3221: return $next;
3222: }
3223:
3224: # Is there a current resource to grab? If not, then return
3225: # END_MAP, which will end the iterator.
3226: if (scalar(@{$self->{STACK}}) == 0) {
3227: return $self->END_MAP();
3228: }
3229:
3230: # Have we not yet begun? If not, return BEGIN_MAP and
3231: # remember that we've started.
3232: if ( !$self->{STARTED} ) {
3233: $self->{STARTED} = 1;
3234: return $self->BEGIN_MAP;
3235: }
3236:
3237: # Get the next resource in the branch
3238: $self->{HERE} = pop @{$self->{STACK}};
3239:
3240: # remember that we've seen this, so we don't return it again later
3241: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3242:
3243: # Get the next possible resources
3244: my $nextUnfiltered;
3245: if ($self->{DIRECTION} == FORWARD()) {
3246: $nextUnfiltered = $self->{HERE}->getNext();
3247: } else {
3248: $nextUnfiltered = $self->{HERE}->getPrevious();
3249: }
3250: my $next = [];
3251:
3252: # filter the next possibilities to remove things we've
3253: # already seen.
3254: foreach (@$nextUnfiltered) {
3255: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3256: push @$next, $_;
3257: }
3258: }
3259:
3260: while (@$next) {
3261: # copy the next possibilities over to the stack
3262: push @{$self->{STACK}}, shift @$next;
3263: }
3264:
3265: # If this is a map and we want to recurse down it... (not filtered out)
3266: if ($self->{HERE}->is_map() &&
3267: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3268: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3269: my $firstResource = $self->{HERE}->map_start();
3270: my $finishResource = $self->{HERE}->map_finish();
3271:
3272: $self->{RECURSIVE_ITERATOR} =
3273: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3274: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3275: $self->{CONDITION}, $self->{DIRECTION});
3276: }
3277:
3278: return $self->{HERE};
3279: }
3280:
3281: # Identical to the full iterator methods of the same name. Hate to copy/paste
3282: # but I also hate to "inherit" either iterator from the other.
3283:
3284: sub getStack {
3285: my $self=shift;
3286:
3287: my @stack;
3288:
3289: $self->populateStack(\@stack);
3290:
3291: return \@stack;
3292: }
3293:
3294: # Private method: Calls the iterators recursively to populate the stack.
3295: sub populateStack {
3296: my $self=shift;
3297: my $stack = shift;
3298:
3299: push @$stack, $self->{HERE} if ($self->{HERE});
3300:
3301: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3302: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3303: }
3304: }
3305:
3306: 1;
3307:
3308: package Apache::lonnavmaps::resource;
3309: use WeakRef;
3310: use Apache::lonnet;
3311:
3312: =pod
3313:
3314: =head1 Object: resource
3315:
3316: X<resource, navmap object>
3317: A resource object encapsulates a resource in a resource map, allowing
3318: easy manipulation of the resource, querying the properties of the
3319: resource (including user properties), and represents a reference that
3320: can be used as the canonical representation of the resource by
3321: lonnavmap clients like renderers.
3322:
3323: A resource only makes sense in the context of a navmap, as some of the
3324: data is stored in the navmap object.
3325:
3326: You will probably never need to instantiate this object directly. Use
3327: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3328: starting resource.
3329:
3330: Resource objects respect the parameter_hiddenparts, which suppresses
3331: various parts according to the wishes of the map author. As of this
3332: writing, there is no way to override this parameter, and suppressed
3333: parts will never be returned, nor will their response types or ids be
3334: stored.
3335:
3336: =head2 Overview
3337:
3338: A B<Resource> is the most granular type of object in LON-CAPA that can
3339: be included in a course. It can either be a particular resource, like
3340: an HTML page, external resource, problem, etc., or it can be a
3341: container sequence, such as a "page" or a "map".
3342:
3343: To see a sequence from the user's point of view, please see the
3344: B<Creating a Course: Maps and Sequences> chapter of the Author's
3345: Manual.
3346:
3347: A Resource Object, once obtained from a navmap object via a B<getBy*>
3348: method of the navmap, or from an iterator, allows you to query
3349: information about that resource.
3350:
3351: Generally, you do not ever want to create a resource object yourself,
3352: so creation has been left undocumented. Always retrieve resources
3353: from navmap objects.
3354:
3355: =head3 Identifying Resources
3356:
3357: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3358: unique to that resource for a given course. X<resource ID, in big hash>
3359: The Resource ID has the form #.#, where the first number is the same
3360: for every resource in a map, and the second is unique. For instance,
3361: for a course laid out like this:
3362:
3363: * Problem 1
3364: * Map
3365: * Resource 2
3366: * Resource 3
3367:
3368: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3369: C<Resource 3> will share a first number. The second number may end up
3370: re-used between the two groups.
3371:
3372: The resource ID is only used in the big hash, but can be used in the
3373: context of a course to identify a resource easily. (For instance, the
3374: printing system uses it to record which resources from a sequence you
3375: wish to print.)
3376:
3377: X<symb> X<resource, symb>
3378: All resources also have B<symb>s, which uniquely identify a resource
3379: in a course. Many internal LON-CAPA functions expect a symb. A symb
3380: carries along with it the URL of the resource, and the map it appears
3381: in. Symbs are much larger then resource IDs.
3382:
3383: =cut
3384:
3385: sub new {
3386: # magic invocation to create a class instance
3387: my $proto = shift;
3388: my $class = ref($proto) || $proto;
3389: my $self = {};
3390:
3391: weaken($self->{NAV_MAP} = shift);
3392: $self->{ID} = shift;
3393:
3394: # Store this new resource in the parent nav map's cache.
3395: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3396: $self->{RESOURCE_ERROR} = 0;
3397:
3398: # A hash that can be used by two-pass algorithms to store data
3399: # about this resource in. Not used by the resource object
3400: # directly.
3401: $self->{DATA} = {};
3402:
3403: bless($self);
3404:
3405: return $self;
3406: }
3407:
3408: # private function: simplify the NAV_HASH lookups we keep doing
3409: # pass the name, and to automatically append my ID, pass a true val on the
3410: # second param
3411: sub navHash {
3412: my $self = shift;
3413: my $param = shift;
3414: my $id = shift;
3415: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3416: }
3417:
3418: =pod
3419:
3420: =head2 Methods
3421:
3422: Once you have a resource object, here's what you can do with it:
3423:
3424: =head3 Attribute Retrieval
3425:
3426: Every resource has certain attributes that can be retrieved and used:
3427:
3428: =over 4
3429:
3430: =item * B<ID>: Every resource has an ID that is unique for that
3431: resource in the course it is in. The ID is actually in the hash
3432: representing the resource, so for a resource object $res, obtain
3433: it via C<$res->{ID}).
3434:
3435: =item * B<compTitle>:
3436:
3437: Returns a "composite title", that is equal to $res->title() if the
3438: resource has a title, and is otherwise the last part of the URL (e.g.,
3439: "problem.problem").
3440:
3441: =item * B<ext>:
3442:
3443: Returns true if the resource is external.
3444:
3445: =item * B<kind>:
3446:
3447: Returns the kind of the resource from the compiled nav map.
3448:
3449: =item * B<randomout>:
3450:
3451: Returns true if this resource was chosen to NOT be shown to the user
3452: by the random map selection feature. In other words, this is usually
3453: false.
3454:
3455: =item * B<randompick>:
3456:
3457: Returns true for a map if the randompick feature is being used on the
3458: map. (?)
3459:
3460: =item * B<src>:
3461:
3462: Returns the source for the resource.
3463:
3464: =item * B<symb>:
3465:
3466: Returns the symb for the resource.
3467:
3468: =item * B<title>:
3469:
3470: Returns the title of the resource.
3471:
3472: =back
3473:
3474: =cut
3475:
3476: # These info functions can be used directly, as they don't return
3477: # resource information.
3478: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3479: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 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 link {
3492: my $self=shift;
3493: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3494: return $self->src;
3495: }
3496: sub src {
3497: my $self=shift;
3498: return $self->navHash("src_", 1);
3499: }
3500: sub shown_symb {
3501: my $self=shift;
3502: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3503: return $self->symb();
3504: }
3505: sub id {
3506: my $self=shift;
3507: return $self->{ID};
3508: }
3509: sub enclosing_map_src {
3510: my $self=shift;
3511: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3512: return $self->navHash('map_id_'.$first);
3513: }
3514: sub symb {
3515: my $self=shift;
3516: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3517: my $symbSrc = &Apache::lonnet::declutter($self->src());
3518: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3519: . '___' . $second . '___' . $symbSrc;
3520: return &Apache::lonnet::symbclean($symb);
3521: }
3522: sub wrap_symb {
3523: my $self = shift;
3524: return $self->{NAV_MAP}->wrap_symb($self->symb());
3525: }
3526: sub title {
3527: my $self=shift;
3528: if ($self->{ID} eq '0.0') {
3529: # If this is the top-level map, return the title of the course
3530: # since this map can not be titled otherwise.
3531: return $env{'course.'.$env{'request.course.id'}.'.description'};
3532: }
3533: return $self->navHash("title_", 1); }
3534: # considered private and undocumented
3535: sub to { my $self=shift; return $self->navHash("to_", 1); }
3536: sub condition {
3537: my $self=shift;
3538: my $undercond=$self->navHash("undercond_", 1);
3539: if (!defined($undercond)) { return 1; };
3540: my $condid=$self->navHash("condid_$undercond");
3541: if (!defined($condid)) { return 1; };
3542: my $condition=&Apache::lonnet::directcondval($condid);
3543: return $condition;
3544: }
3545:
3546: sub compTitle {
3547: my $self = shift;
3548: my $title = $self->title();
3549: $title=~s/\&colon\;/\:/gs;
3550: if (!$title) {
3551: $title = $self->src();
3552: $title = substr($title, rindex($title, '/') + 1);
3553: }
3554: return $title;
3555: }
3556: =pod
3557:
3558: B<Predicate Testing the Resource>
3559:
3560: These methods are shortcuts to deciding if a given resource has a given property.
3561:
3562: =over 4
3563:
3564: =item * B<is_map>:
3565:
3566: Returns true if the resource is a map type.
3567:
3568: =item * B<is_problem>:
3569:
3570: Returns true if the resource is a problem type, false
3571: otherwise. (Looks at the extension on the src field; might need more
3572: to work correctly.)
3573:
3574: =item * B<is_page>:
3575:
3576: Returns true if the resource is a page.
3577:
3578: =item * B<is_sequence>:
3579:
3580: Returns true if the resource is a sequence.
3581:
3582: =back
3583:
3584: =cut
3585:
3586: sub hasResource {
3587: my $self = shift;
3588: return $self->{NAV_MAP}->hasResource(@_);
3589: }
3590:
3591: sub retrieveResources {
3592: my $self = shift;
3593: return $self->{NAV_MAP}->retrieveResources(@_);
3594: }
3595:
3596: sub is_html {
3597: my $self=shift;
3598: my $src = $self->src();
3599: return ($src =~ /html$/);
3600: }
3601: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3602: sub is_page {
3603: my $self=shift;
3604: my $src = $self->src();
3605: return $self->navHash("is_map_", 1) &&
3606: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3607: }
3608: sub is_problem {
3609: my $self=shift;
3610: my $src = $self->src();
3611: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3612: }
3613: sub contains_problem {
3614: my $self=shift;
3615: if ($self->is_page()) {
3616: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3617: return $hasProblem;
3618: }
3619: return 0;
3620: }
3621: sub is_sequence {
3622: my $self=shift;
3623: my $src = $self->src();
3624: return $self->navHash("is_map_", 1) &&
3625: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3626: }
3627: sub is_survey {
3628: my $self = shift();
3629: my $part = shift();
3630: if ($self->parmval('type',$part) eq 'survey') {
3631: return 1;
3632: }
3633: if ($self->src() =~ /\.(survey)$/) {
3634: return 1;
3635: }
3636: return 0;
3637: }
3638:
3639: sub is_empty_sequence {
3640: my $self=shift;
3641: my $src = $self->src();
3642: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3643: }
3644:
3645: # Private method: Shells out to the parmval in the nav map, handler parts.
3646: sub parmval {
3647: my $self = shift;
3648: my $what = shift;
3649: my $part = shift;
3650: if (!defined($part)) {
3651: $part = '0';
3652: }
3653: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3654: }
3655:
3656: =pod
3657:
3658: B<Map Methods>
3659:
3660: These methods are useful for getting information about the map
3661: properties of the resource, if the resource is a map (B<is_map>).
3662:
3663: =over 4
3664:
3665: =item * B<map_finish>:
3666:
3667: Returns a reference to a resource object corresponding to the finish
3668: resource of the map.
3669:
3670: =item * B<map_pc>:
3671:
3672: Returns the pc value of the map, which is the first number that
3673: appears in the resource ID of the resources in the map, and is the
3674: number that appears around the middle of the symbs of the resources in
3675: that map.
3676:
3677: =item * B<map_start>:
3678:
3679: Returns a reference to a resource object corresponding to the start
3680: resource of the map.
3681:
3682: =item * B<map_type>:
3683:
3684: Returns a string with the type of the map in it.
3685:
3686: =back
3687:
3688: =cut
3689:
3690: sub map_finish {
3691: my $self = shift;
3692: my $src = $self->src();
3693: $src = Apache::lonnet::clutter($src);
3694: my $res = $self->navHash("map_finish_$src", 0);
3695: $res = $self->{NAV_MAP}->getById($res);
3696: return $res;
3697: }
3698: sub map_pc {
3699: my $self = shift;
3700: my $src = $self->src();
3701: return $self->navHash("map_pc_$src", 0);
3702: }
3703: sub map_start {
3704: my $self = shift;
3705: my $src = $self->src();
3706: $src = Apache::lonnet::clutter($src);
3707: my $res = $self->navHash("map_start_$src", 0);
3708: $res = $self->{NAV_MAP}->getById($res);
3709: return $res;
3710: }
3711: sub map_type {
3712: my $self = shift;
3713: my $pc = $self->map_pc();
3714: return $self->navHash("map_type_$pc", 0);
3715: }
3716:
3717: #####
3718: # Property queries
3719: #####
3720:
3721: # These functions will be responsible for returning the CORRECT
3722: # VALUE for the parameter, no matter what. So while they may look
3723: # like direct calls to parmval, they can be more then that.
3724: # So, for instance, the duedate function should use the "duedatetype"
3725: # information, rather then the resource object user.
3726:
3727: =pod
3728:
3729: =head2 Resource Parameters
3730:
3731: In order to use the resource parameters correctly, the nav map must
3732: have been instantiated with genCourseAndUserOptions set to true, so
3733: the courseopt and useropt is read correctly. Then, you can call these
3734: functions to get the relevant parameters for the resource. Each
3735: function defaults to part "0", but can be directed to another part by
3736: passing the part as the parameter.
3737:
3738: These methods are responsible for getting the parameter correct, not
3739: merely reflecting the contents of the GDBM hashes. As we move towards
3740: dates relative to other dates, these methods should be updated to
3741: reflect that. (Then, anybody using these methods will not have to update
3742: their code.)
3743:
3744: =over 4
3745:
3746: =item * B<acc>:
3747:
3748: Get the Client IP/Name Access Control information.
3749:
3750: =item * B<answerdate>:
3751:
3752: Get the answer-reveal date for the problem.
3753:
3754: =item * B<awarded>:
3755:
3756: Gets the awarded value for the problem part. Requires genUserData set to
3757: true when the navmap object was created.
3758:
3759: =item * B<duedate>:
3760:
3761: Get the due date for the problem.
3762:
3763: =item * B<tries>:
3764:
3765: Get the number of tries the student has used on the problem.
3766:
3767: =item * B<maxtries>:
3768:
3769: Get the number of max tries allowed.
3770:
3771: =item * B<opendate>:
3772:
3773: Get the open date for the problem.
3774:
3775: =item * B<sig>:
3776:
3777: Get the significant figures setting.
3778:
3779: =item * B<tol>:
3780:
3781: Get the tolerance for the problem.
3782:
3783: =item * B<tries>:
3784:
3785: Get the number of tries the user has already used on the problem.
3786:
3787: =item * B<type>:
3788:
3789: Get the question type for the problem.
3790:
3791: =item * B<weight>:
3792:
3793: Get the weight for the problem.
3794:
3795: =back
3796:
3797: =cut
3798:
3799: sub acc {
3800: (my $self, my $part) = @_;
3801: return $self->parmval("acc", $part);
3802: }
3803: sub answerdate {
3804: (my $self, my $part) = @_;
3805: # Handle intervals
3806: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3807: return $self->duedate($part) +
3808: $self->parmval("answerdate", $part);
3809: }
3810: return $self->parmval("answerdate", $part);
3811: }
3812: sub awarded {
3813: my $self = shift; my $part = shift;
3814: $self->{NAV_MAP}->get_user_data();
3815: if (!defined($part)) { $part = '0'; }
3816: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3817: }
3818: sub duedate {
3819: (my $self, my $part) = @_;
3820: my $interval=$self->parmval("interval", $part);
3821: if ($interval) {
3822: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3823: if ($first_access) { return ($first_access+$interval); }
3824: }
3825: return $self->parmval("duedate", $part);
3826: }
3827: sub maxtries {
3828: (my $self, my $part) = @_;
3829: return $self->parmval("maxtries", $part);
3830: }
3831: sub opendate {
3832: (my $self, my $part) = @_;
3833: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3834: return $self->duedate($part) -
3835: $self->parmval("opendate", $part);
3836: }
3837: return $self->parmval("opendate");
3838: }
3839: sub problemstatus {
3840: (my $self, my $part) = @_;
3841: return lc $self->parmval("problemstatus", $part);
3842: }
3843: sub sig {
3844: (my $self, my $part) = @_;
3845: return $self->parmval("sig", $part);
3846: }
3847: sub tol {
3848: (my $self, my $part) = @_;
3849: return $self->parmval("tol", $part);
3850: }
3851: sub tries {
3852: my $self = shift;
3853: my $tries = $self->queryRestoreHash('tries', shift);
3854: if (!defined($tries)) { return '0';}
3855: return $tries;
3856: }
3857: sub type {
3858: (my $self, my $part) = @_;
3859: return $self->parmval("type", $part);
3860: }
3861: sub weight {
3862: my $self = shift; my $part = shift;
3863: if (!defined($part)) { $part = '0'; }
3864: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3865: $self->symb(), $env{'user.domain'},
3866: $env{'user.name'},
3867: $env{'request.course.sec'});
3868: }
3869: sub part_display {
3870: my $self= shift(); my $partID = shift();
3871: if (! defined($partID)) { $partID = '0'; }
3872: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3873: $self->symb);
3874: if (! defined($display) || $display eq '') {
3875: $display = $partID;
3876: }
3877: return $display;
3878: }
3879:
3880: # Multiple things need this
3881: sub getReturnHash {
3882: my $self = shift;
3883:
3884: if (!defined($self->{RETURN_HASH})) {
3885: my %tmpHash = &Apache::lonnet::restore($self->symb());
3886: $self->{RETURN_HASH} = \%tmpHash;
3887: }
3888: }
3889:
3890: ######
3891: # Status queries
3892: ######
3893:
3894: # These methods query the status of problems.
3895:
3896: # If we need to count parts, this function determines the number of
3897: # parts from the metadata. When called, it returns a reference to a list
3898: # of strings corresponding to the parts. (Thus, using it in a scalar context
3899: # tells you how many parts you have in the problem:
3900: # $partcount = scalar($resource->countParts());
3901: # Don't use $self->{PARTS} directly because you don't know if it's been
3902: # computed yet.
3903:
3904: =pod
3905:
3906: =head2 Resource misc
3907:
3908: Misc. functions for the resource.
3909:
3910: =over 4
3911:
3912: =item * B<hasDiscussion>:
3913:
3914: Returns a false value if there has been discussion since the user last
3915: logged in, true if there has. Always returns false if the discussion
3916: data was not extracted when the nav map was constructed.
3917:
3918: =item * B<getFeedback>:
3919:
3920: Gets the feedback for the resource and returns the raw feedback string
3921: for the resource, or the null string if there is no feedback or the
3922: email data was not extracted when the nav map was constructed. Usually
3923: used like this:
3924:
3925: for (split(/\,/, $res->getFeedback())) {
3926: my $link = &Apache::lonnet::escape($_);
3927: ...
3928:
3929: and use the link as appropriate.
3930:
3931: =cut
3932:
3933: sub hasDiscussion {
3934: my $self = shift;
3935: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3936: }
3937:
3938: sub getFeedback {
3939: my $self = shift;
3940: my $source = $self->src();
3941: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3942: return $self->{NAV_MAP}->getFeedback($source);
3943: }
3944:
3945: sub getErrors {
3946: my $self = shift;
3947: my $source = $self->src();
3948: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3949: return $self->{NAV_MAP}->getErrors($source);
3950: }
3951:
3952: =pod
3953:
3954: =item * B<parts>():
3955:
3956: Returns a list reference containing sorted strings corresponding to
3957: each part of the problem. Single part problems have only a part '0'.
3958: Multipart problems do not return their part '0', since they typically
3959: do not really matter.
3960:
3961: =item * B<countParts>():
3962:
3963: Returns the number of parts of the problem a student can answer. Thus,
3964: for single part problems, returns 1. For multipart, it returns the
3965: number of parts in the problem, not including psuedo-part 0.
3966:
3967: =item * B<countResponses>():
3968:
3969: Returns the total number of responses in the problem a student can answer.
3970:
3971: =item * B<responseTypes>():
3972:
3973: Returns a hash whose keys are the response types. The values are the number
3974: of times each response type is used. This is for the I<entire> problem, not
3975: just a single part.
3976:
3977: =item * B<multipart>():
3978:
3979: Returns true if the problem is multipart, false otherwise. Use this instead
3980: of countParts if all you want is multipart/not multipart.
3981:
3982: =item * B<responseType>($part):
3983:
3984: Returns the response type of the part, without the word "response" on the
3985: end. Example return values: 'string', 'essay', 'numeric', etc.
3986:
3987: =item * B<responseIds>($part):
3988:
3989: Retreives the response IDs for the given part as an array reference containing
3990: strings naming the response IDs. This may be empty.
3991:
3992: =back
3993:
3994: =cut
3995:
3996: sub parts {
3997: my $self = shift;
3998:
3999: if ($self->ext) { return []; }
4000:
4001: $self->extractParts();
4002: return $self->{PARTS};
4003: }
4004:
4005: sub countParts {
4006: my $self = shift;
4007:
4008: my $parts = $self->parts();
4009:
4010: # If I left this here, then it's not necessary.
4011: #my $delta = 0;
4012: #for my $part (@$parts) {
4013: # if ($part eq '0') { $delta--; }
4014: #}
4015:
4016: if ($self->{RESOURCE_ERROR}) {
4017: return 0;
4018: }
4019:
4020: return scalar(@{$parts}); # + $delta;
4021: }
4022:
4023: sub countResponses {
4024: my $self = shift;
4025: my $count;
4026: foreach my $part (@{$self->parts()}) {
4027: $count+= scalar($self->responseIds($part));
4028: }
4029: return $count;
4030: }
4031:
4032: sub responseTypes {
4033: my $self = shift;
4034: my %responses;
4035: foreach my $part ($self->parts()) {
4036: foreach my $responsetype ($self->responseType($part)) {
4037: $responses{$responsetype}++ if (defined($responsetype));
4038: }
4039: }
4040: return %responses;
4041: }
4042:
4043: sub multipart {
4044: my $self = shift;
4045: return $self->countParts() > 1;
4046: }
4047:
4048: sub singlepart {
4049: my $self = shift;
4050: return $self->countParts() == 1;
4051: }
4052:
4053: sub responseType {
4054: my $self = shift;
4055: my $part = shift;
4056:
4057: $self->extractParts();
4058: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4059: return @{$self->{RESPONSE_TYPES}->{$part}};
4060: } else {
4061: return undef;
4062: }
4063: }
4064:
4065: sub responseIds {
4066: my $self = shift;
4067: my $part = shift;
4068:
4069: $self->extractParts();
4070: if (defined($self->{RESPONSE_IDS}->{$part})) {
4071: return @{$self->{RESPONSE_IDS}->{$part}};
4072: } else {
4073: return undef;
4074: }
4075: }
4076:
4077: # Private function: Extracts the parts information, both part names and
4078: # part types, and saves it.
4079: sub extractParts {
4080: my $self = shift;
4081:
4082: return if (defined($self->{PARTS}));
4083: return if ($self->ext);
4084:
4085: $self->{PARTS} = [];
4086:
4087: my %parts;
4088:
4089: # Retrieve part count, if this is a problem
4090: if ($self->is_problem()) {
4091: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4092: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4093:
4094: if ($partorder) {
4095: my @parts;
4096: for my $part (split (/,/,$partorder)) {
4097: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4098: push @parts, $part;
4099: $parts{$part} = 1;
4100: }
4101: }
4102: $self->{PARTS} = \@parts;
4103: } else {
4104: if (!$metadata) {
4105: $self->{RESOURCE_ERROR} = 1;
4106: $self->{PARTS} = [];
4107: $self->{PART_TYPE} = {};
4108: return;
4109: }
4110: foreach (split(/\,/,$metadata)) {
4111: if ($_ =~ /^part_(.*)$/) {
4112: my $part = $1;
4113: # This floods the logs if it blows up
4114: if (defined($parts{$part})) {
4115: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4116: }
4117:
4118: # check to see if part is turned off.
4119:
4120: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4121: $parts{$part} = 1;
4122: }
4123: }
4124: }
4125: my @sortedParts = sort keys %parts;
4126: $self->{PARTS} = \@sortedParts;
4127: }
4128:
4129:
4130: # These hashes probably do not need names that end with "Hash"....
4131: my %responseIdHash;
4132: my %responseTypeHash;
4133:
4134:
4135: # Init the responseIdHash
4136: foreach (@{$self->{PARTS}}) {
4137: $responseIdHash{$_} = [];
4138: }
4139:
4140: # Now, the unfortunate thing about this is that parts, part name, and
4141: # response id are delimited by underscores, but both the part
4142: # name and response id can themselves have underscores in them.
4143: # So we have to use our knowlege of part names to figure out
4144: # where the part names begin and end, and even then, it is possible
4145: # to construct ambiguous situations.
4146: foreach (split /,/, $metadata) {
4147: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4148: my $responseType = $1;
4149: my $partStuff = $2;
4150: my $partIdSoFar = '';
4151: my @partChunks = split /_/, $partStuff;
4152: my $i = 0;
4153: for ($i = 0; $i < scalar(@partChunks); $i++) {
4154: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4155: $partIdSoFar .= $partChunks[$i];
4156: if ($parts{$partIdSoFar}) {
4157: my @otherChunks = @partChunks[$i+1..$#partChunks];
4158: my $responseId = join('_', @otherChunks);
4159: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4160: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4161: }
4162: }
4163: }
4164: }
4165: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4166: #
4167: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4168: if ($resorder) {
4169: my @resorder=split(/,/,$resorder);
4170: foreach my $part (keys(%responseIdHash)) {
4171: my $i=0;
4172: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4173: my @neworder;
4174: foreach my $possibleid (@resorder) {
4175: if (exists($resids{$possibleid})) {
4176: push(@neworder,$resids{$possibleid});
4177: }
4178: }
4179: my @ids;
4180: my @type;
4181: foreach my $element (@neworder) {
4182: push (@ids,$responseIdHash{$part}->[$element]);
4183: push (@type,$responseTypeHash{$part}->[$element]);
4184: }
4185: $responseIdHash{$part}=\@ids;
4186: $responseTypeHash{$part}=\@type;
4187: }
4188: }
4189: $self->{RESPONSE_IDS} = \%responseIdHash;
4190: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4191: }
4192:
4193: return;
4194: }
4195:
4196: =pod
4197:
4198: =head2 Resource Status
4199:
4200: Problem resources have status information, reflecting their various
4201: dates and completion statuses.
4202:
4203: There are two aspects to the status: the date-related information and
4204: the completion information.
4205:
4206: Idiomatic usage of these two methods would probably look something
4207: like
4208:
4209: foreach ($resource->parts()) {
4210: my $dateStatus = $resource->getDateStatus($_);
4211: my $completionStatus = $resource->getCompletionStatus($_);
4212:
4213: or
4214:
4215: my $status = $resource->status($_);
4216:
4217: ... use it here ...
4218: }
4219:
4220: Which you use depends on exactly what you are looking for. The
4221: status() function has been optimized for the nav maps display and may
4222: not precisely match what you need elsewhere.
4223:
4224: The symbolic constants shown below can be accessed through the
4225: resource object: C<$res->OPEN>.
4226:
4227: =over 4
4228:
4229: =item * B<getDateStatus>($part):
4230:
4231: ($part defaults to 0). A convenience function that returns a symbolic
4232: constant telling you about the date status of the part. The possible
4233: return values are:
4234:
4235: =back
4236:
4237: B<Date Codes>
4238:
4239: =over 4
4240:
4241: =item * B<OPEN_LATER>:
4242:
4243: The problem will be opened later.
4244:
4245: =item * B<OPEN>:
4246:
4247: Open and not yet due.
4248:
4249:
4250: =item * B<PAST_DUE_ANSWER_LATER>:
4251:
4252: The due date has passed, but the answer date has not yet arrived.
4253:
4254: =item * B<PAST_DUE_NO_ANSWER>:
4255:
4256: The due date has passed and there is no answer opening date set.
4257:
4258: =item * B<ANSWER_OPEN>:
4259:
4260: The answer date is here.
4261:
4262: =item * B<NETWORK_FAILURE>:
4263:
4264: The information is unknown due to network failure.
4265:
4266: =back
4267:
4268: =cut
4269:
4270: # Apparently the compiler optimizes these into constants automatically
4271: sub OPEN_LATER { return 0; }
4272: sub OPEN { return 1; }
4273: sub PAST_DUE_NO_ANSWER { return 2; }
4274: sub PAST_DUE_ANSWER_LATER { return 3; }
4275: sub ANSWER_OPEN { return 4; }
4276: sub NOTHING_SET { return 5; }
4277: sub NETWORK_FAILURE { return 100; }
4278:
4279: # getDateStatus gets the date status for a given problem part.
4280: # Because answer date, due date, and open date are fully independent
4281: # (i.e., it is perfectly possible to *only* have an answer date),
4282: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4283: # (past, future, none given). This function handles this with a decision
4284: # tree. Read the comments to follow the decision tree.
4285:
4286: sub getDateStatus {
4287: my $self = shift;
4288: my $part = shift;
4289: $part = "0" if (!defined($part));
4290:
4291: # Always return network failure if there was one.
4292: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4293:
4294: my $now = time();
4295:
4296: my $open = $self->opendate($part);
4297: my $due = $self->duedate($part);
4298: my $answer = $self->answerdate($part);
4299:
4300: if (!$open && !$due && !$answer) {
4301: # no data on the problem at all
4302: # should this be the same as "open later"? think multipart.
4303: return $self->NOTHING_SET;
4304: }
4305: if (!$open || $now < $open) {return $self->OPEN_LATER}
4306: if (!$due || $now < $due) {return $self->OPEN}
4307: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4308: if ($answer) { return $self->ANSWER_OPEN; }
4309: return PAST_DUE_NO_ANSWER;
4310: }
4311:
4312: =pod
4313:
4314: B<>
4315:
4316: =over 4
4317:
4318: =item * B<getCompletionStatus>($part):
4319:
4320: ($part defaults to 0.) A convenience function that returns a symbolic
4321: constant telling you about the completion status of the part, with the
4322: following possible results:
4323:
4324: =back
4325:
4326: B<Completion Codes>
4327:
4328: =over 4
4329:
4330: =item * B<NOT_ATTEMPTED>:
4331:
4332: Has not been attempted at all.
4333:
4334: =item * B<INCORRECT>:
4335:
4336: Attempted, but wrong by student.
4337:
4338: =item * B<INCORRECT_BY_OVERRIDE>:
4339:
4340: Attempted, but wrong by instructor override.
4341:
4342: =item * B<CORRECT>:
4343:
4344: Correct or correct by instructor.
4345:
4346: =item * B<CORRECT_BY_OVERRIDE>:
4347:
4348: Correct by instructor override.
4349:
4350: =item * B<EXCUSED>:
4351:
4352: Excused. Not yet implemented.
4353:
4354: =item * B<NETWORK_FAILURE>:
4355:
4356: Information not available due to network failure.
4357:
4358: =item * B<ATTEMPTED>:
4359:
4360: Attempted, and not yet graded.
4361:
4362: =back
4363:
4364: =cut
4365:
4366: sub NOT_ATTEMPTED { return 10; }
4367: sub INCORRECT { return 11; }
4368: sub INCORRECT_BY_OVERRIDE { return 12; }
4369: sub CORRECT { return 13; }
4370: sub CORRECT_BY_OVERRIDE { return 14; }
4371: sub EXCUSED { return 15; }
4372: sub ATTEMPTED { return 16; }
4373:
4374: sub getCompletionStatus {
4375: my $self = shift;
4376: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4377:
4378: my $status = $self->queryRestoreHash('solved', shift);
4379:
4380: # Left as separate if statements in case we ever do more with this
4381: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4382: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4383: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
4384: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4385: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4386: if ($status eq 'excused') {return $self->EXCUSED; }
4387: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4388: return $self->NOT_ATTEMPTED;
4389: }
4390:
4391: sub queryRestoreHash {
4392: my $self = shift;
4393: my $hashentry = shift;
4394: my $part = shift;
4395: $part = "0" if (!defined($part) || $part eq '');
4396: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4397:
4398: $self->getReturnHash();
4399:
4400: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4401: }
4402:
4403: =pod
4404:
4405: B<Composite Status>
4406:
4407: Along with directly returning the date or completion status, the
4408: resource object includes a convenience function B<status>() that will
4409: combine the two status tidbits into one composite status that can
4410: represent the status of the resource as a whole. This method represents
4411: the concept of the thing we want to display to the user on the nav maps
4412: screen, which is a combination of completion and open status. The precise logic is
4413: documented in the comments of the status method. The following results
4414: may be returned, all available as methods on the resource object
4415: ($res->NETWORK_FAILURE): In addition to the return values that match
4416: the date or completion status, this function can return "ANSWER_SUBMITTED"
4417: if that problemstatus parameter value is set to No, suppressing the
4418: incorrect/correct feedback.
4419:
4420: =over 4
4421:
4422: =item * B<NETWORK_FAILURE>:
4423:
4424: The network has failed and the information is not available.
4425:
4426: =item * B<NOTHING_SET>:
4427:
4428: No dates have been set for this problem (part) at all. (Because only
4429: certain parts of a multi-part problem may be assigned, this can not be
4430: collapsed into "open later", as we do not know a given part will EVER
4431: be opened. For single part, this is the same as "OPEN_LATER".)
4432:
4433: =item * B<CORRECT>:
4434:
4435: For any reason at all, the part is considered correct.
4436:
4437: =item * B<EXCUSED>:
4438:
4439: For any reason at all, the problem is excused.
4440:
4441: =item * B<PAST_DUE_NO_ANSWER>:
4442:
4443: The problem is past due, not considered correct, and no answer date is
4444: set.
4445:
4446: =item * B<PAST_DUE_ANSWER_LATER>:
4447:
4448: The problem is past due, not considered correct, and an answer date in
4449: the future is set.
4450:
4451: =item * B<ANSWER_OPEN>:
4452:
4453: The problem is past due, not correct, and the answer is now available.
4454:
4455: =item * B<OPEN_LATER>:
4456:
4457: The problem is not yet open.
4458:
4459: =item * B<TRIES_LEFT>:
4460:
4461: The problem is open, has been tried, is not correct, but there are
4462: tries left.
4463:
4464: =item * B<INCORRECT>:
4465:
4466: The problem is open, and all tries have been used without getting the
4467: correct answer.
4468:
4469: =item * B<OPEN>:
4470:
4471: The item is open and not yet tried.
4472:
4473: =item * B<ATTEMPTED>:
4474:
4475: The problem has been attempted.
4476:
4477: =item * B<ANSWER_SUBMITTED>:
4478:
4479: An answer has been submitted, but the student should not see it.
4480:
4481: =back
4482:
4483: =cut
4484:
4485: sub TRIES_LEFT { return 20; }
4486: sub ANSWER_SUBMITTED { return 21; }
4487:
4488: sub status {
4489: my $self = shift;
4490: my $part = shift;
4491: if (!defined($part)) { $part = "0"; }
4492: my $completionStatus = $self->getCompletionStatus($part);
4493: my $dateStatus = $self->getDateStatus($part);
4494:
4495: # What we have is a two-dimensional matrix with 4 entries on one
4496: # dimension and 5 entries on the other, which we want to colorize,
4497: # plus network failure and "no date data at all".
4498:
4499: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4500: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4501:
4502: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4503: # If there's an answer date and we're past it, don't
4504: # suppress the feedback; student should know
4505: if ($self->duedate($part) && $self->duedate($part) < time() &&
4506: $self->answerdate($part) && $self->answerdate($part) < time()) {
4507: $suppressFeedback = 0;
4508: }
4509:
4510: # There are a few whole rows we can dispose of:
4511: if ($completionStatus == CORRECT ||
4512: $completionStatus == CORRECT_BY_OVERRIDE ) {
4513: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4514: }
4515:
4516: if ($completionStatus == ATTEMPTED) {
4517: return ATTEMPTED;
4518: }
4519:
4520: # If it's EXCUSED, then return that no matter what
4521: if ($completionStatus == EXCUSED) {
4522: return EXCUSED;
4523: }
4524:
4525: if ($dateStatus == NOTHING_SET) {
4526: return NOTHING_SET;
4527: }
4528:
4529: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4530: # by 4 matrix (date statuses).
4531:
4532: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4533: $dateStatus == PAST_DUE_NO_ANSWER ) {
4534: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4535: }
4536:
4537: if ($dateStatus == ANSWER_OPEN) {
4538: return ANSWER_OPEN;
4539: }
4540:
4541: # Now: (incorrect, incorrect_override, not_attempted) x
4542: # (open_later), (open)
4543:
4544: if ($dateStatus == OPEN_LATER) {
4545: return OPEN_LATER;
4546: }
4547:
4548: # If it's WRONG...
4549: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4550: # and there are TRIES LEFT:
4551: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4552: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4553: }
4554: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4555: }
4556:
4557: # Otherwise, it's untried and open
4558: return OPEN;
4559: }
4560:
4561: sub CLOSED { return 23; }
4562: sub ERROR { return 24; }
4563:
4564: =pod
4565:
4566: B<Simple Status>
4567:
4568: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4569: "Simple status" corresponds to "which icon is shown on the
4570: Navmaps". There are six "simple" statuses:
4571:
4572: =over 4
4573:
4574: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4575:
4576: =item * B<OPEN>: The problem is open and unattempted.
4577:
4578: =item * B<CORRECT>: The problem is correct for any reason.
4579:
4580: =item * B<INCORRECT>: The problem is incorrect and can still be
4581: completed successfully.
4582:
4583: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4584: does not know if they are correct. (The ellipsis icon.)
4585:
4586: =item * B<ERROR>: There is an error retrieving information about this
4587: problem.
4588:
4589: =back
4590:
4591: =cut
4592:
4593: # This hash maps the composite status to this simple status, and
4594: # can be used directly, if you like
4595: my %compositeToSimple =
4596: (
4597: NETWORK_FAILURE() => ERROR,
4598: NOTHING_SET() => CLOSED,
4599: CORRECT() => CORRECT,
4600: EXCUSED() => CORRECT,
4601: PAST_DUE_NO_ANSWER() => INCORRECT,
4602: PAST_DUE_ANSWER_LATER() => INCORRECT,
4603: ANSWER_OPEN() => INCORRECT,
4604: OPEN_LATER() => CLOSED,
4605: TRIES_LEFT() => OPEN,
4606: INCORRECT() => INCORRECT,
4607: OPEN() => OPEN,
4608: ATTEMPTED() => ATTEMPTED,
4609: ANSWER_SUBMITTED() => ATTEMPTED
4610: );
4611:
4612: sub simpleStatus {
4613: my $self = shift;
4614: my $part = shift;
4615: my $status = $self->status($part);
4616: return $compositeToSimple{$status};
4617: }
4618:
4619: =pod
4620:
4621: B<simpleStatusCount> will return an array reference containing, in
4622: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4623: and ERROR parts the given problem has.
4624:
4625: =cut
4626:
4627: # This maps the status to the slot we want to increment
4628: my %statusToSlotMap =
4629: (
4630: OPEN() => 0,
4631: CLOSED() => 1,
4632: CORRECT() => 2,
4633: INCORRECT() => 3,
4634: ATTEMPTED() => 4,
4635: ERROR() => 5
4636: );
4637:
4638: sub statusToSlot { return $statusToSlotMap{shift()}; }
4639:
4640: sub simpleStatusCount {
4641: my $self = shift;
4642:
4643: my @counts = (0, 0, 0, 0, 0, 0, 0);
4644: foreach my $part (@{$self->parts()}) {
4645: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4646: }
4647:
4648: return \@counts;
4649: }
4650:
4651: =pod
4652:
4653: B<Completable>
4654:
4655: The completable method represents the concept of I<whether the student can
4656: currently do the problem>. If the student can do the problem, which means
4657: that it is open, there are tries left, and if the problem is manually graded
4658: or the grade is suppressed via problemstatus, the student has not tried it
4659: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4660: either the student has tried it and there is no feedback, or that for
4661: some reason it is no longer completable (not open yet, successfully completed,
4662: out of tries, etc.). As an example, this is used as the filter for the
4663: "Uncompleted Homework" option for the nav maps.
4664:
4665: If this does not quite meet your needs, do not fiddle with it (unless you are
4666: fixing it to better match the student's conception of "completable" because
4667: it's broken somehow)... make a new method.
4668:
4669: =cut
4670:
4671: sub completable {
4672: my $self = shift;
4673: if (!$self->is_problem()) { return 0; }
4674: my $partCount = $self->countParts();
4675:
4676: foreach my $part (@{$self->parts()}) {
4677: if ($part eq '0' && $partCount != 1) { next; }
4678: my $status = $self->status($part);
4679: # "If any of the parts are open, or have tries left (implies open),
4680: # and it is not "attempted" (manually graded problem), it is
4681: # not "complete"
4682: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4683: $status == ANSWER_SUBMITTED() ) {
4684: # did this part already, as well as we can
4685: next;
4686: }
4687: if ($status == OPEN() || $status == TRIES_LEFT()) {
4688: return 1;
4689: }
4690: }
4691:
4692: # If all the parts were complete, so was this problem.
4693: return 0;
4694: }
4695:
4696: =pod
4697:
4698: =head2 Resource/Nav Map Navigation
4699:
4700: =over 4
4701:
4702: =item * B<getNext>():
4703:
4704: Retreive an array of the possible next resources after this
4705: one. Always returns an array, even in the one- or zero-element case.
4706:
4707: =item * B<getPrevious>():
4708:
4709: Retreive an array of the possible previous resources from this
4710: one. Always returns an array, even in the one- or zero-element case.
4711:
4712: =cut
4713:
4714: sub getNext {
4715: my $self = shift;
4716: my @branches;
4717: my $to = $self->to();
4718: foreach my $branch ( split(/,/, $to) ) {
4719: my $choice = $self->{NAV_MAP}->getById($branch);
4720: if (!$choice->condition()) { next; }
4721: my $next = $choice->goesto();
4722: $next = $self->{NAV_MAP}->getById($next);
4723:
4724: push @branches, $next;
4725: }
4726: return \@branches;
4727: }
4728:
4729: sub getPrevious {
4730: my $self = shift;
4731: my @branches;
4732: my $from = $self->from();
4733: foreach my $branch ( split /,/, $from) {
4734: my $choice = $self->{NAV_MAP}->getById($branch);
4735: my $prev = $choice->comesfrom();
4736: $prev = $self->{NAV_MAP}->getById($prev);
4737:
4738: push @branches, $prev;
4739: }
4740: return \@branches;
4741: }
4742:
4743: sub browsePriv {
4744: my $self = shift;
4745: if (defined($self->{BROWSE_PRIV})) {
4746: return $self->{BROWSE_PRIV};
4747: }
4748:
4749: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4750: $self->symb());
4751: }
4752:
4753: =pod
4754:
4755: =back
4756:
4757: =cut
4758:
4759: 1;
4760:
4761: __END__
4762:
4763:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonnavmaps.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / interface