1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.316 2005/02/17 08:29:43 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::loncommon();
35: use Apache::lonmenu();
36: use Apache::lonenc();
37: use Apache::lonlocal;
38: use Apache::lonnet;
39: use POSIX qw (floor strftime);
40: use Data::Dumper; # for debugging, not always
41: use Time::HiRes qw( gettimeofday tv_interval );
42:
43: # symbolic constants
44: sub SYMB { return 1; }
45: sub URL { return 2; }
46: sub NOTHING { return 3; }
47:
48: # Some data
49:
50: my $resObj = "Apache::lonnavmaps::resource";
51:
52: # Keep these mappings in sync with lonquickgrades, which uses the colors
53: # instead of the icons.
54: my %statusIconMap =
55: (
56: $resObj->CLOSED => '',
57: $resObj->OPEN => 'navmap.open.gif',
58: $resObj->CORRECT => 'navmap.correct.gif',
59: $resObj->INCORRECT => 'navmap.wrong.gif',
60: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
61: $resObj->ERROR => ''
62: );
63:
64: my %iconAltTags =
65: ( 'navmap.correct.gif' => 'Correct',
66: 'navmap.wrong.gif' => 'Incorrect',
67: 'navmap.open.gif' => 'Open' );
68:
69: # Defines a status->color mapping, null string means don't color
70: my %colormap =
71: ( $resObj->NETWORK_FAILURE => '',
72: $resObj->CORRECT => '',
73: $resObj->EXCUSED => '#3333FF',
74: $resObj->PAST_DUE_ANSWER_LATER => '',
75: $resObj->PAST_DUE_NO_ANSWER => '',
76: $resObj->ANSWER_OPEN => '#006600',
77: $resObj->OPEN_LATER => '',
78: $resObj->TRIES_LEFT => '',
79: $resObj->INCORRECT => '',
80: $resObj->OPEN => '',
81: $resObj->NOTHING_SET => '',
82: $resObj->ATTEMPTED => '',
83: $resObj->ANSWER_SUBMITTED => ''
84: );
85: # And a special case in the nav map; what to do when the assignment
86: # is not yet done and due in less then 24 hours
87: my $hurryUpColor = "#FF0000";
88:
89: sub launch_win {
90: my ($mode,$script,$toplinkitems)=@_;
91: my $result;
92: if ($script ne 'no') {
93: $result.='<script type="text/javascript">';
94: }
95: $result.='function launch_navmapwin() {
96: newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
97: }';
98: if ($mode eq 'now') {
99: $result.="\nlaunch_navmapwin();\n";
100: }
101: if ($script ne 'no') {
102: $result.='</script>';
103: }
104: if ($mode eq 'link') {
105: &add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
106: "Launch navigation window");
107: }
108: return $result;
109: }
110:
111: sub close {
112: if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
113: return(<<ENDCLOSE);
114: <script type="text/javascript">
115: window.status='Accessing Nav Control';
116: menu=window.open("/adm/rat/empty.html","loncapanav",
117: "height=600,width=400,scrollbars=1");
118: window.status='Closing Nav Control';
119: menu.close();
120: window.status='Done.';
121: </script>
122: ENDCLOSE
123: }
124:
125: sub update {
126: if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
127: if (!$ENV{'request.course.id'}) { return ''; }
128: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
129: return(<<ENDUPDATE);
130: <form name="navform"></form>
131: <script type="text/javascript">
132: this.document.navform.action='/adm/navmaps#curloc';
133: this.document.navform.target='loncapanav';
134: this.document.navform.submit();
135: </script>
136: ENDUPDATE
137: }
138:
139: sub handler {
140: my $r = shift;
141: real_handler($r);
142: }
143:
144: sub real_handler {
145: my $r = shift;
146: #my $t0=[&gettimeofday()];
147: # Handle header-only request
148: if ($r->header_only) {
149: if ($ENV{'browser.mathml'}) {
150: &Apache::loncommon::content_type($r,'text/xml');
151: } else {
152: &Apache::loncommon::content_type($r,'text/html');
153: }
154: $r->send_http_header;
155: return OK;
156: }
157:
158: # Send header, don't cache this page
159: if ($ENV{'browser.mathml'}) {
160: &Apache::loncommon::content_type($r,'text/xml');
161: } else {
162: &Apache::loncommon::content_type($r,'text/html');
163: }
164: &Apache::loncommon::no_cache($r);
165: $r->send_http_header;
166:
167: my %toplinkitems=();
168: &add_linkitem(\%toplinkitems,'blank','',"Select Action");
169: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
170: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
171: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
172: my $menu=&Apache::lonmenu::reopenmenu();
173: my $navstatus=&Apache::lonmenu::get_nav_status();
174: if ($menu) {
175: $menu=(<<MENU)
176: swmenu=$menu
177: swmenu.clearTimeout(swmenu.menucltim);
178: $navstatus
179: MENU
180: } else {
181: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
182: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
183: $menu=(<<MENU)
184: swmenu=$mainwindow
185: $navstatus
186: MENU
187: }
188: my $html=&Apache::lonxml::xmlbegin();
189: $r->print(<<"ENDSUBM");
190: $html
191: <head>
192: <script type="text/javascript">
193: function submitthis() {
194: $menu
195: self.close();
196: }
197:
198: </script>
199: </head>
200: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
201: </html>
202: ENDSUBM
203: return;
204: }
205: if ($ENV{QUERY_STRING} eq 'launchExternal') {
206: &Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
207: &Apache::lonnet::appenv('environment.remotenavmap' => 'on');
208: }
209:
210: # Create the nav map
211: my $navmap = Apache::lonnavmaps::navmap->new();
212:
213: if (!defined($navmap)) {
214: my $requrl = $r->uri;
215: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
216: return HTTP_NOT_ACCEPTABLE;
217: }
218: my $html=&Apache::lonxml::xmlbegin();
219: $r->print("$html<head>\n");
220: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
221: # ------------------------------------------------------------ Get query string
222: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework','postsymb']);
223:
224: # ----------------------------------------------------- Force menu registration
225: my $addentries='';
226: my $more_unload;
227: my $body_only='';
228: if ($ENV{'environment.remotenavmap'} eq 'on') {
229: $r->print('<script type="text/javascript">
230: function collapse() {
231: this.document.location="/adm/navmaps?collapseExternal";
232: }
233: </script>');
234: # FIXME need to be smarter to only catch window close events
235: # $more_unload="collapse()"
236: $body_only=1;
237: }
238: if ($ENV{'form.register'}) {
239: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
240: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
241: $more_unload.'"';
242: $r->print(&Apache::lonmenu::registerurl(1));
243: } else {
244: $addentries=' onUnload="'.$more_unload.'"';
245: }
246:
247: # Header
248: $r->print('</head>'.
249: &Apache::loncommon::bodytag('Navigate Course Contents','',
250: $addentries,$body_only,'',
251: $ENV{'form.register'}));
252: $r->print('<script>window.focus();</script>');
253:
254: $r->rflush();
255:
256: # Check that it's defined
257: if (!($navmap->courseMapDefined())) {
258: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
259: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
260: '</body></html>');
261: return OK;
262: }
263:
264: # See if there's only one map in the top-level, if we don't
265: # already have a filter... if so, automatically display it
266: # (older code; should use retrieveResources)
267: if ($ENV{QUERY_STRING} !~ /filter/) {
268: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
269: my $curRes;
270: my $sequenceCount = 0;
271: my $sequenceId;
272: while ($curRes = $iterator->next()) {
273: if (ref($curRes) && $curRes->is_sequence()) {
274: $sequenceCount++;
275: $sequenceId = $curRes->map_pc();
276: }
277: }
278:
279: if ($sequenceCount == 1) {
280: # The automatic iterator creation in the render call
281: # will pick this up. We know the condition because
282: # the defined($ENV{'form.filter'}) also ensures this
283: # is a fresh call.
284: $ENV{'form.filter'} = "$sequenceId";
285: }
286: }
287:
288: if ($ENV{QUERY_STRING} eq 'launchExternal') {
289: $r->print('
290: <form name="returnwin" action="/adm/flip?postdata=return%3a"
291: method="post" target="loncapaclient">
292: </form>');
293: $r->print('
294: <script type="text/javascript">
295: this.document.returnwin.submit();
296: </script>');
297: }
298:
299: if ($ENV{'environment.remotenavmap'} ne 'on') {
300: $r->print(&launch_win('link','yes',\%toplinkitems));
301: }
302: if ($ENV{'environment.remotenavmap'} eq 'on') {
303: &add_linkitem(\%toplinkitems,'closenav','collapse()',
304: "Close navigation window");
305: }
306:
307: my $jumpToFirstHomework = 0;
308: # Check to see if the student is jumping to next open, do-able problem
309: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
310: $jumpToFirstHomework = 1;
311: # Find the next homework problem that they can do.
312: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
313: my $curRes;
314: my $foundDoableProblem = 0;
315: my $problemRes;
316:
317: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
318: if (ref($curRes) && $curRes->is_problem()) {
319: my $status = $curRes->status();
320: if ($curRes->completable()) {
321: $problemRes = $curRes;
322: $foundDoableProblem = 1;
323:
324: # Pop open all previous maps
325: my $stack = $iterator->getStack();
326: pop @$stack; # last resource in the stack is the problem
327: # itself, which we don't need in the map stack
328: my @mapPcs = map {$_->map_pc()} @$stack;
329: $ENV{'form.filter'} = join(',', @mapPcs);
330:
331: # Mark as both "here" and "jump"
332: $ENV{'form.postsymb'} = $curRes->symb();
333: }
334: }
335: }
336:
337: # If we found no problems, print a note to that effect.
338: if (!$foundDoableProblem) {
339: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
340: }
341: } else {
342: &add_linkitem(\%toplinkitems,'firsthomework',
343: 'location.href="navmaps?jumpToFirstHomework"',
344: "Show Me My First Homework Problem");
345: }
346:
347: my $suppressEmptySequences = 0;
348: my $filterFunc = undef;
349: my $resource_no_folder_link = 0;
350:
351: # Display only due homework.
352: my $showOnlyHomework = 0;
353: if ($ENV{'form.showOnlyHomework'} eq "1") {
354: $showOnlyHomework = 1;
355: $suppressEmptySequences = 1;
356: $filterFunc = sub { my $res = shift;
357: return $res->completable() || $res->is_map();
358: };
359: &add_linkitem(\%toplinkitems,'everything',
360: 'location.href="navmaps?sort='.$ENV{'form.sort'}.'"',
361: "Show Everything");
362: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
363: $ENV{'form.filter'} = '';
364: $ENV{'form.condition'} = 1;
365: $resource_no_folder_link = 1;
366: } else {
367: &add_linkitem(\%toplinkitems,'uncompleted',
368: 'location.href="navmaps?sort='.$ENV{'form.sort'}.
369: '&showOnlyHomework=1"',
370: "Show Only Uncompleted Homework");
371: }
372:
373: my %selected=($ENV{'form.sort'} => 'selected=on');
374: my $sort_html=("<form>
375: <nobr>
376: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$ENV{'form.showOnlyHomework'}."\" />
377: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
378: <select name=\"sort\">
379: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
380: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
381: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
382: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has New Discussion')."</option>
383: </select>
384: </nobr>
385: </form>");
386: # renderer call
387: my $renderArgs = { 'cols' => [0,1,2,3],
388: 'sort' => $ENV{'form.sort'},
389: 'url' => '/adm/navmaps',
390: 'navmap' => $navmap,
391: 'suppressNavmap' => 1,
392: 'suppressEmptySequences' => $suppressEmptySequences,
393: 'filterFunc' => $filterFunc,
394: 'resource_no_folder_link' => $resource_no_folder_link,
395: 'sort_html'=> $sort_html,
396: 'r' => $r,
397: 'caller' => 'navmapsdisplay',
398: 'linkitems' => \%toplinkitems};
399: my $render = render($renderArgs);
400:
401: # If no resources were printed, print a reassuring message so the
402: # user knows there was no error.
403: if ($renderArgs->{'counter'} == 0) {
404: if ($showOnlyHomework) {
405: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
406: } else { # both jumpToFirstHomework and normal use the same: course must be empty
407: $r->print("<p><font size='+1'>This course is empty.</font></p>");
408: }
409: }
410: #my $td=&tv_interval($t0);
411: #$r->print("<br />$td");
412:
413: $r->print("</body></html>");
414: $r->rflush();
415:
416: return OK;
417: }
418:
419: # Convenience functions: Returns a string that adds or subtracts
420: # the second argument from the first hash, appropriate for the
421: # query string that determines which folders to recurse on
422: sub addToFilter {
423: my $hashIn = shift;
424: my $addition = shift;
425: my %hash = %$hashIn;
426: $hash{$addition} = 1;
427:
428: return join (",", keys(%hash));
429: }
430:
431: sub removeFromFilter {
432: my $hashIn = shift;
433: my $subtraction = shift;
434: my %hash = %$hashIn;
435:
436: delete $hash{$subtraction};
437: return join(",", keys(%hash));
438: }
439:
440: # Convenience function: Given a stack returned from getStack on the iterator,
441: # return the correct src() value.
442: sub getLinkForResource {
443: my $stack = shift;
444: my $res;
445:
446: # Check to see if there are any pages in the stack
447: foreach $res (@$stack) {
448: if (defined($res)) {
449: my $anchor;
450: if ($res->is_page()) {
451: foreach (@$stack) { if (defined($_)) { $anchor = $_; } }
452: $anchor=&Apache::lonnet::escape($anchor->shown_symb());
453: return ($res->link(),$res->shown_symb(),$anchor);
454: }
455: # in case folder was skipped over as "only sequence"
456: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
457: if ($map=~/\.page$/) {
458: my $url=&Apache::lonnet::clutter($map);
459: $anchor=&Apache::lonnet::escape($src->shown_symb());
460: return ($url,$res->shown_symb(),$anchor);
461: }
462: }
463: }
464:
465: # Failing that, return the src of the last resource that is defined
466: # (when we first recurse on a map, it puts an undefined resource
467: # on the bottom because $self->{HERE} isn't defined yet, and we
468: # want the src for the map anyhow)
469: foreach (@$stack) {
470: if (defined($_)) { $res = $_; }
471: }
472:
473: return ($res->link(),$res->shown_symb());
474: }
475:
476: # Convenience function: This separates the logic of how to create
477: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
478: # etc.) into a separate function. It takes a resource object as the
479: # first parameter, and the part number of the resource as the second.
480: # It's basically a big switch statement on the status of the resource.
481:
482: sub getDescription {
483: my $res = shift;
484: my $part = shift;
485: my $status = $res->status($part);
486:
487: if ($status == $res->NETWORK_FAILURE) {
488: return &mt("Having technical difficulties; please check status later");
489: }
490: if ($status == $res->NOTHING_SET) {
491: return &mt("Not currently assigned.");
492: }
493: if ($status == $res->OPEN_LATER) {
494: return "Open " . timeToHumanString($res->opendate($part));
495: }
496: if ($status == $res->OPEN) {
497: if ($res->duedate($part)) {
498: return &mt("Due")." " .timeToHumanString($res->duedate($part));
499: } else {
500: return &mt("Open, no due date");
501: }
502: }
503: if ($status == $res->PAST_DUE_ANSWER_LATER) {
504: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
505: }
506: if ($status == $res->PAST_DUE_NO_ANSWER) {
507: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
508: }
509: if ($status == $res->ANSWER_OPEN) {
510: return &mt("Answer available");
511: }
512: if ($status == $res->EXCUSED) {
513: return &mt("Excused by instructor");
514: }
515: if ($status == $res->ATTEMPTED) {
516: return &mt("Answer submitted, not yet graded");
517: }
518: if ($status == $res->TRIES_LEFT) {
519: my $tries = $res->tries($part);
520: my $maxtries = $res->maxtries($part);
521: my $triesString = "";
522: if ($tries && $maxtries) {
523: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
524: if ($maxtries > 1 && $maxtries - $tries == 1) {
525: $triesString = "<b>$triesString</b>";
526: }
527: }
528: if ($res->duedate($part)) {
529: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
530: " $triesString";
531: } else {
532: return &mt("No due date")." $triesString";
533: }
534: }
535: if ($status == $res->ANSWER_SUBMITTED) {
536: return &mt('Answer submitted');
537: }
538: }
539:
540: # Convenience function, so others can use it: Is the problem due in less then
541: # 24 hours, and still can be done?
542:
543: sub dueInLessThan24Hours {
544: my $res = shift;
545: my $part = shift;
546: my $status = $res->status($part);
547:
548: return ($status == $res->OPEN() ||
549: $status == $res->TRIES_LEFT()) &&
550: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
551: $res->duedate($part) > time();
552: }
553:
554: # Convenience function, so others can use it: Is there only one try remaining for the
555: # part, with more then one try to begin with, not due yet and still can be done?
556: sub lastTry {
557: my $res = shift;
558: my $part = shift;
559:
560: my $tries = $res->tries($part);
561: my $maxtries = $res->maxtries($part);
562: return $tries && $maxtries && $maxtries > 1 &&
563: $maxtries - $tries == 1 && $res->duedate($part) &&
564: $res->duedate($part) > time();
565: }
566:
567: # This puts a human-readable name on the ENV variable.
568:
569: sub advancedUser {
570: return $ENV{'request.role.adv'};
571: }
572:
573:
574: # timeToHumanString takes a time number and converts it to a
575: # human-readable representation, meant to be used in the following
576: # manner:
577: # print "Due $timestring"
578: # print "Open $timestring"
579: # print "Answer available $timestring"
580: # Very, very, very, VERY English-only... goodness help a localizer on
581: # this func...
582: sub timeToHumanString {
583: my ($time) = @_;
584: # zero, '0' and blank are bad times
585: if (!$time) {
586: return &mt('never');
587: }
588: unless (&Apache::lonlocal::current_language()=~/^en/) {
589: return &Apache::lonlocal::locallocaltime($time);
590: }
591: my $now = time();
592:
593: my @time = localtime($time);
594: my @now = localtime($now);
595:
596: # Positive = future
597: my $delta = $time - $now;
598:
599: my $minute = 60;
600: my $hour = 60 * $minute;
601: my $day = 24 * $hour;
602: my $week = 7 * $day;
603: my $inPast = 0;
604:
605: # Logic in comments:
606: # Is it now? (extremely unlikely)
607: if ( $delta == 0 ) {
608: return "this instant";
609: }
610:
611: if ($delta < 0) {
612: $inPast = 1;
613: $delta = -$delta;
614: }
615:
616: if ( $delta > 0 ) {
617:
618: my $tense = $inPast ? " ago" : "";
619: my $prefix = $inPast ? "" : "in ";
620:
621: # Less then a minute
622: if ( $delta < $minute ) {
623: if ($delta == 1) { return "${prefix}1 second$tense"; }
624: return "$prefix$delta seconds$tense";
625: }
626:
627: # Less then an hour
628: if ( $delta < $hour ) {
629: # If so, use minutes
630: my $minutes = floor($delta / 60);
631: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
632: return "$prefix$minutes minutes$tense";
633: }
634:
635: # Is it less then 24 hours away? If so,
636: # display hours + minutes
637: if ( $delta < $hour * 24) {
638: my $hours = floor($delta / $hour);
639: my $minutes = floor(($delta % $hour) / $minute);
640: my $hourString = "$hours hours";
641: my $minuteString = ", $minutes minutes";
642: if ($hours == 1) {
643: $hourString = "1 hour";
644: }
645: if ($minutes == 1) {
646: $minuteString = ", 1 minute";
647: }
648: if ($minutes == 0) {
649: $minuteString = "";
650: }
651: return "$prefix$hourString$minuteString$tense";
652: }
653:
654: # Less then 5 days away, display day of the week and
655: # HH:MM
656: if ( $delta < $day * 5 ) {
657: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
658: $timeStr =~ s/12:00 am/00:00/;
659: $timeStr =~ s/12:00 pm/noon/;
660: return ($inPast ? "last " : "next ") .
661: $timeStr;
662: }
663:
664: # Is it this year?
665: if ( $time[5] == $now[5]) {
666: # Return on Month Day, HH:MM meridian
667: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
668: $timeStr =~ s/12:00 am/00:00/;
669: $timeStr =~ s/12:00 pm/noon/;
670: return $timeStr;
671: }
672:
673: # Not this year, so show the year
674: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
675: $timeStr =~ s/12:00 am/00:00/;
676: $timeStr =~ s/12:00 pm/noon/;
677: return $timeStr;
678: }
679: }
680:
681:
682: =pod
683:
684: =head1 NAME
685:
686: Apache::lonnavmap - Subroutines to handle and render the navigation
687: maps
688:
689: =head1 SYNOPSIS
690:
691: The main handler generates the navigational listing for the course,
692: the other objects export this information in a usable fashion for
693: other modules.
694:
695: =head1 OVERVIEW
696:
697: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
698: course structure and caches it in what is often referred to as the
699: "big hash" X<big hash>. You can see it if you are logged into
700: LON-CAPA, in a course, by going to /adm/test. (You may need to
701: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
702: content of the hash will be under the heading "Big Hash".
703:
704: Big Hash contains, among other things, how resources are related
705: to each other (next/previous), what resources are maps, which
706: resources are being chosen to not show to the student (for random
707: selection), and a lot of other things that can take a lot of time
708: to compute due to the amount of data that needs to be collected and
709: processed.
710:
711: Apache::lonnavmaps provides an object model for manipulating this
712: information in a higher-level fashion then directly manipulating
713: the hash. It also provides access to several auxilary functions
714: that aren't necessarily stored in the Big Hash, but are a per-
715: resource sort of value, like whether there is any feedback on
716: a given resource.
717:
718: Apache::lonnavmaps also abstracts away branching, and someday,
719: conditions, for the times where you don't really care about those
720: things.
721:
722: Apache::lonnavmaps also provides fairly powerful routines for
723: rendering navmaps, and last but not least, provides the navmaps
724: view for when the user clicks the NAV button.
725:
726: B<Note>: Apache::lonnavmaps I<only> works for the "currently
727: logged in user"; if you want things like "due dates for another
728: student" lonnavmaps can not directly retrieve information like
729: that. You need the EXT function. This module can still help,
730: because many things, such as the course structure, are constant
731: between users, and Apache::lonnavmaps can help by providing
732: symbs for the EXT call.
733:
734: The rest of this file will cover the provided rendering routines,
735: which can often be used without fiddling with the navmap object at
736: all, then documents the Apache::lonnavmaps::navmap object, which
737: is the key to accessing the Big Hash information, covers the use
738: of the Iterator (which provides the logic for traversing the
739: somewhat-complicated Big Hash data structure), documents the
740: Apache::lonnavmaps::Resource objects that are returned by
741:
742: =head1 Subroutine: render
743:
744: The navmap renderer package provides a sophisticated rendering of the
745: standard navigation maps interface into HTML. The provided nav map
746: handler is actually just a glorified call to this.
747:
748: Because of the large number of parameters this function accepts,
749: instead of passing it arguments as is normal, pass it in an anonymous
750: hash with the desired options.
751:
752: The package provides a function called 'render', called as
753: Apache::lonnavmaps::render({}).
754:
755: =head2 Overview of Columns
756:
757: The renderer will build an HTML table for the navmap and return
758: it. The table is consists of several columns, and a row for each
759: resource (or possibly each part). You tell the renderer how many
760: columns to create and what to place in each column, optionally using
761: one or more of the prepared columns, and the renderer will assemble
762: the table.
763:
764: Any additional generally useful column types should be placed in the
765: renderer code here, so anybody can use it anywhere else. Any code
766: specific to the current application (such as the addition of <input>
767: elements in a column) should be placed in the code of the thing using
768: the renderer.
769:
770: At the core of the renderer is the array reference COLS (see Example
771: section below for how to pass this correctly). The COLS array will
772: consist of entries of one of two types of things: Either an integer
773: representing one of the pre-packaged column types, or a sub reference
774: that takes a resource reference, a part number, and a reference to the
775: argument hash passed to the renderer, and returns a string that will
776: be inserted into the HTML representation as it.
777:
778: All other parameters are ways of either changing how the columns
779: are printing, or which rows are shown.
780:
781: The pre-packaged column names are refered to by constants in the
782: Apache::lonnavmaps namespace. The following currently exist:
783:
784: =over 4
785:
786: =item * B<Apache::lonnavmaps::resource>:
787:
788: The general info about the resource: Link, icon for the type, etc. The
789: first column in the standard nav map display. This column provides the
790: indentation effect seen in the B<NAV> screen. This column also accepts
791: the following parameters in the renderer hash:
792:
793: =over 4
794:
795: =item * B<resource_nolink>: default false
796:
797: If true, the resource will not be linked. By default, all non-folder
798: resources are linked.
799:
800: =item * B<resource_part_count>: default true
801:
802: If true, the resource will show a part count B<if> the full
803: part list is not displayed. (See "condense_parts" later.) If false,
804: the resource will never show a part count.
805:
806: =item * B<resource_no_folder_link>:
807:
808: If true, the resource's folder will not be clickable to open or close
809: it. Default is false. True implies printCloseAll is false, since you
810: can't close or open folders when this is on anyhow.
811:
812: =back
813:
814: =item * B<Apache::lonnavmaps::communication_status>:
815:
816: Whether there is discussion on the resource, email for the user, or
817: (lumped in here) perl errors in the execution of the problem. This is
818: the second column in the main nav map.
819:
820: =item * B<Apache::lonnavmaps::quick_status>:
821:
822: An icon for the status of a problem, with five possible states:
823: Correct, incorrect, open, awaiting grading (for a problem where the
824: computer's grade is suppressed, or the computer can't grade, like
825: essay problem), or none (not open yet, not a problem). The
826: third column of the standard navmap.
827:
828: =item * B<Apache::lonnavmaps::long_status>:
829:
830: A text readout of the details of the current status of the problem,
831: such as "Due in 22 hours". The fourth column of the standard navmap.
832:
833: =item * B<Apache::lonnavmaps::part_status_summary>:
834:
835: A text readout summarizing the status of the problem. If it is a
836: single part problem, will display "Correct", "Incorrect",
837: "Not yet open", "Open", "Attempted", or "Error". If there are
838: multiple parts, this will output a string that in HTML will show a
839: status of how many parts are in each status, in color coding, trying
840: to match the colors of the icons within reason.
841:
842: Note this only makes sense if you are I<not> showing parts. If
843: C<showParts> is true (see below), this column will not output
844: anything.
845:
846: =back
847:
848: If you add any others please be sure to document them here.
849:
850: An example of a column renderer that will show the ID number of a
851: resource, along with the part name if any:
852:
853: sub {
854: my ($resource, $part, $params) = @_;
855: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
856: return '<td>' . $resource->{ID} . '</td>';
857: }
858:
859: Note these functions are responsible for the TD tags, which allow them
860: to override vertical and horizontal alignment, etc.
861:
862: =head2 Parameters
863:
864: Minimally, you should be
865: able to get away with just using 'cols' (to specify the columns
866: shown), 'url' (necessary for the folders to link to the current screen
867: correctly), and possibly 'queryString' if your app calls for it. In
868: that case, maintaining the state of the folders will be done
869: automatically.
870:
871: =over 4
872:
873: =item * B<iterator>: default: constructs one from %ENV
874:
875: A reference to a fresh ::iterator to use from the navmaps. The
876: rendering will reflect the options passed to the iterator, so you can
877: use that to just render a certain part of the course, if you like. If
878: one is not passed, the renderer will attempt to construct one from
879: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
880: 'iterator_map' parameter if any.
881:
882: =item * B<iterator_map>: default: not used
883:
884: If you are letting the renderer do the iterator handling, you can
885: instruct the renderer to render only a particular map by passing it
886: the source of the map you want to process, like
887: '/res/103/jerf/navmap.course.sequence'.
888:
889: =item * B<navmap>: default: constructs one from %ENV
890:
891: A reference to a navmap, used only if an iterator is not passed in. If
892: this is necessary to make an iterator but it is not passed in, a new
893: one will be constructed based on ENV info. This is useful to do basic
894: error checking before passing it off to render.
895:
896: =item * B<r>: default: must be passed in
897:
898: The standard Apache response object. This must be passed to the
899: renderer or the course hash will be locked.
900:
901: =item * B<cols>: default: empty (useless)
902:
903: An array reference
904:
905: =item * B<showParts>:default true
906:
907: A flag. If true, a line for the resource itself, and a line
908: for each part will be displayed. If not, only one line for each
909: resource will be displayed.
910:
911: =item * B<condenseParts>: default true
912:
913: A flag. If true, if all parts of the problem have the same
914: status and that status is Nothing Set, Correct, or Network Failure,
915: then only one line will be displayed for that resource anyhow. If no,
916: all parts will always be displayed. If showParts is 0, this is
917: ignored.
918:
919: =item * B<jumpCount>: default: determined from %ENV
920:
921: A string identifying the URL to place the anchor 'curloc' at.
922: It is the responsibility of the renderer user to
923: ensure that the #curloc is in the URL. By default, determined through
924: the use of the ENV{} 'jump' information, and should normally "just
925: work" correctly.
926:
927: =item * B<here>: default: empty string
928:
929: A Symb identifying where to place the 'here' marker. The empty
930: string means no marker.
931:
932: =item * B<indentString>: default: 25 pixel whitespace image
933:
934: A string identifying the indentation string to use.
935:
936: =item * B<queryString>: default: empty
937:
938: A string which will be prepended to the query string used when the
939: folders are opened or closed. You can use this to pass
940: application-specific values.
941:
942: =item * B<url>: default: none
943:
944: The url the folders will link to, which should be the current
945: page. Required if the resource info column is shown, and you
946: are allowing the user to open and close folders.
947:
948: =item * B<currentJumpIndex>: default: no jumping
949:
950: Describes the currently-open row number to cause the browser to jump
951: to, because the user just opened that folder. By default, pulled from
952: the Jump information in the ENV{'form.*'}.
953:
954: =item * B<printKey>: default: false
955:
956: If true, print the key that appears on the top of the standard
957: navmaps.
958:
959: =item * B<printCloseAll>: default: true
960:
961: If true, print the "Close all folders" or "open all folders"
962: links.
963:
964: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
965:
966: A function that takes the resource object as its only parameter and
967: returns a true or false value. If true, the resource is displayed. If
968: false, it is simply skipped in the display.
969:
970: =item * B<suppressEmptySequences>: default: false
971:
972: If you're using a filter function, and displaying sequences to orient
973: the user, then frequently some sequences will be empty. Setting this to
974: true will cause those sequences not to display, so as not to confuse the
975: user into thinking that if the sequence is there there should be things
976: under it; for example, see the "Show Uncompleted Homework" view on the
977: B<NAV> screen.
978:
979: =item * B<suppressNavmaps>: default: false
980:
981: If true, will not display Navigate Content resources.
982:
983: =back
984:
985: =head2 Additional Info
986:
987: In addition to the parameters you can pass to the renderer, which will
988: be passed through unchange to the column renderers, the renderer will
989: generate the following information which your renderer may find
990: useful:
991:
992: =over 4
993:
994: =item * B<counter>:
995:
996: Contains the number of rows printed. Useful after calling the render
997: function, as you can detect whether anything was printed at all.
998:
999: =item * B<isNewBranch>:
1000:
1001: Useful for renderers: If this resource is currently the first resource
1002: of a new branch, this will be true. The Resource column (leftmost in the
1003: navmaps screen) uses this to display the "new branch" icon
1004:
1005: =back
1006:
1007: =cut
1008:
1009: sub resource { return 0; }
1010: sub communication_status { return 1; }
1011: sub quick_status { return 2; }
1012: sub long_status { return 3; }
1013: sub part_status_summary { return 4; }
1014:
1015: sub render_resource {
1016: my ($resource, $part, $params) = @_;
1017:
1018: my $nonLinkedText = ''; # stuff after resource title not in link
1019:
1020: my $link = $params->{"resourceLink"};
1021:
1022: # The URL part is not escaped at this point, but the symb is...
1023: # The stuff to the left of the ? must have ' replaced by \' since
1024: # it will be quoted with ' in the href.
1025:
1026: my ($left,$right) = split(/\?/, $link);
1027: $left =~ s/'/\\'/g;
1028: $link = $left.'?'.$right;
1029:
1030: my $src = $resource->src();
1031: my $it = $params->{"iterator"};
1032: my $filter = $it->{FILTER};
1033:
1034: my $title = $resource->compTitle();
1035:
1036: my $partLabel = "";
1037: my $newBranchText = "";
1038: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1039: # If this is a new branch, label it so
1040: if ($params->{'isNewBranch'}) {
1041: $newBranchText = "<img src='$location/branch.gif' border='0' />";
1042: }
1043:
1044: # links to open and close the folder
1045:
1046:
1047: my $linkopen = "<a href='$link'>";
1048:
1049:
1050: my $linkclose = "</a>";
1051:
1052: # Default icon: unknown page
1053: my $icon = "<img src='$location/unknown.gif' alt='' border='0' />";
1054:
1055: if ($resource->is_problem()) {
1056: if ($part eq '0' || $params->{'condensed'}) {
1057: $icon ='<img src="'.$location.'/problem.gif" alt="" border="0" />';
1058: } else {
1059: $icon = $params->{'indentString'};
1060: }
1061: } else {
1062: $icon = "<img src='".&Apache::loncommon::lonhttpdurl(&Apache::loncommon::icon($resource->src))."' alt='' border='0' />";
1063: }
1064:
1065: # Display the correct map icon to open or shut map
1066: if ($resource->is_map()) {
1067: my $mapId = $resource->map_pc();
1068: my $nowOpen = !defined($filter->{$mapId});
1069: if ($it->{CONDITION}) {
1070: $nowOpen = !$nowOpen;
1071: }
1072:
1073: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1074:
1075: if (!$params->{'resource_no_folder_link'}) {
1076: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1077: $icon = "<img src='$location/$icon' alt='' border='0' />";
1078:
1079: $linkopen = "<a href='" . $params->{'url'} . '?' .
1080: $params->{'queryString'} . '&filter=';
1081: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1082: addToFilter($filter, $mapId) :
1083: removeFromFilter($filter, $mapId);
1084: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1085: . $params->{'hereType'} . '&here=' .
1086: &Apache::lonnet::escape($params->{'here'}) .
1087: '&jump=' .
1088: &Apache::lonnet::escape($resource->symb()) .
1089: "&folderManip=1'>";
1090:
1091: } else {
1092: # Don't allow users to manipulate folder
1093: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1094: '.nomanip.gif';
1095: $icon = "<img src='$location/$icon' alt='' border='0' />";
1096:
1097: $linkopen = "";
1098: $linkclose = "";
1099: }
1100: }
1101:
1102: if ($resource->randomout()) {
1103: $nonLinkedText .= ' <i>(hidden)</i> ';
1104: }
1105:
1106: # We're done preparing and finally ready to start the rendering
1107: my $result = "<td align='left' valign='center'>";
1108:
1109: my $indentLevel = $params->{'indentLevel'};
1110: if ($newBranchText) { $indentLevel--; }
1111:
1112: # print indentation
1113: for (my $i = 0; $i < $indentLevel; $i++) {
1114: $result .= $params->{'indentString'};
1115: }
1116:
1117: # Decide what to display
1118:
1119: $result .= "$newBranchText$linkopen$icon$linkclose";
1120:
1121: my $curMarkerBegin = '';
1122: my $curMarkerEnd = '';
1123:
1124: # Is this the current resource?
1125: if (!$params->{'displayedHereMarker'} &&
1126: $resource->symb() eq $params->{'here'} ) {
1127: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1128: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1129: $params->{'displayedHereMarker'} = 1;
1130: }
1131:
1132: if ($resource->is_problem() && $part ne '0' &&
1133: !$params->{'condensed'}) {
1134: my $displaypart=$resource->part_display($part);
1135: $partLabel = " (Part: $displaypart)";
1136: if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1137: $title = "";
1138: }
1139:
1140: if ($params->{'condensed'} && $resource->countParts() > 1) {
1141: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1142: }
1143:
1144: my $target;
1145: if ($ENV{'environment.remotenavmap'} eq 'on') {
1146: $target=' target="loncapaclient" ';
1147: }
1148: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1149: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1150: } else {
1151: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1152: }
1153:
1154: return $result;
1155: }
1156:
1157: sub render_communication_status {
1158: my ($resource, $part, $params) = @_;
1159: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1160:
1161: my $link = $params->{"resourceLink"};
1162: my $linkopen = "<a href='$link'>";
1163: my $linkclose = "</a>";
1164: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1165: if ($resource->hasDiscussion()) {
1166: $discussionHTML = $linkopen .
1167: '<img border="0" src="'.$location.'/chat.gif" />' .
1168: $linkclose;
1169: }
1170:
1171: if ($resource->getFeedback()) {
1172: my $feedback = $resource->getFeedback();
1173: foreach (split(/\,/, $feedback)) {
1174: if ($_) {
1175: $feedbackHTML .= ' <a href="/adm/email?display='
1176: . &Apache::lonnet::escape($_) . '">'
1177: . '<img src="'.$location.'/feedback.gif" '
1178: . 'border="0" /></a>';
1179: }
1180: }
1181: }
1182:
1183: if ($resource->getErrors()) {
1184: my $errors = $resource->getErrors();
1185: my $errorcount = 0;
1186: foreach (split(/,/, $errors)) {
1187: last if ($errorcount>=10); # Only output 10 bombs maximum
1188: if ($_) {
1189: $errorcount++;
1190: $errorHTML .= ' <a href="/adm/email?display='
1191: . &Apache::lonnet::escape($_) . '">'
1192: . '<img src="'.$location.'/bomb.gif" '
1193: . 'border="0" /></a>';
1194: }
1195: }
1196: }
1197:
1198: if ($params->{'multipart'} && $part != '0') {
1199: $discussionHTML = $feedbackHTML = $errorHTML = '';
1200: }
1201:
1202: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1203:
1204: }
1205: sub render_quick_status {
1206: my ($resource, $part, $params) = @_;
1207: my $result = "";
1208: my $firstDisplayed = !$params->{'condensed'} &&
1209: $params->{'multipart'} && $part eq "0";
1210:
1211: my $link = $params->{"resourceLink"};
1212: my $linkopen = "<a href='$link'>";
1213: my $linkclose = "</a>";
1214:
1215: if ($resource->is_problem() &&
1216: !$firstDisplayed) {
1217:
1218: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1219: my $alt = $iconAltTags{$icon};
1220: if ($icon) {
1221: my $location=
1222: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1223: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1224: } else {
1225: $result .= "<td width='30'> </td>\n";
1226: }
1227: } else { # not problem, no icon
1228: $result .= "<td width='30'> </td>\n";
1229: }
1230:
1231: return $result;
1232: }
1233: sub render_long_status {
1234: my ($resource, $part, $params) = @_;
1235: my $result = "<td align='right' valign='center'>\n";
1236: my $firstDisplayed = !$params->{'condensed'} &&
1237: $params->{'multipart'} && $part eq "0";
1238:
1239: my $color;
1240: if ($resource->is_problem()) {
1241: $color = $colormap{$resource->status};
1242:
1243: if (dueInLessThan24Hours($resource, $part) ||
1244: lastTry($resource, $part)) {
1245: $color = $hurryUpColor;
1246: }
1247: }
1248:
1249: if ($resource->kind() eq "res" &&
1250: $resource->is_problem() &&
1251: !$firstDisplayed) {
1252: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1253: $result .= getDescription($resource, $part);
1254: if ($color) {$result .= "</b></font>"; }
1255: }
1256: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1257: $result .= '(randomly select ' . $resource->randompick() .')';
1258: }
1259:
1260: # Debugging code
1261: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1262: # ' - Part: ' . $part;
1263:
1264: $result .= "</td>\n";
1265:
1266: return $result;
1267: }
1268:
1269: # Colors obtained by taking the icons, matching the colors, and
1270: # possibly reducing the Value (HSV) of the color, if it's too bright
1271: # for text, generally by one third or so.
1272: my %statusColors =
1273: (
1274: $resObj->CLOSED => '#000000',
1275: $resObj->OPEN => '#998b13',
1276: $resObj->CORRECT => '#26933f',
1277: $resObj->INCORRECT => '#c48207',
1278: $resObj->ATTEMPTED => '#a87510',
1279: $resObj->ERROR => '#000000'
1280: );
1281: my %statusStrings =
1282: (
1283: $resObj->CLOSED => 'Not yet open',
1284: $resObj->OPEN => 'Open',
1285: $resObj->CORRECT => 'Correct',
1286: $resObj->INCORRECT => 'Incorrect',
1287: $resObj->ATTEMPTED => 'Attempted',
1288: $resObj->ERROR => 'Network Error'
1289: );
1290: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1291:
1292: use Data::Dumper;
1293: sub render_parts_summary_status {
1294: my ($resource, $part, $params) = @_;
1295: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1296: if ($params->{showParts}) {
1297: return '<td></td>';
1298: }
1299:
1300: my $td = "<td align='right'>\n";
1301: my $endtd = "</td>\n";
1302: my @probs;
1303:
1304: if ($resource->contains_problem) {
1305: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1306: } else {
1307: @probs=($resource);
1308: }
1309: my $return;
1310: my %overallstatus;
1311: my $totalParts;
1312: foreach my $resource (@probs) {
1313: # If there is a single part, just show the simple status
1314: if ($resource->singlepart()) {
1315: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1316: $overallstatus{$status}++;
1317: $totalParts++;
1318: next;
1319: }
1320: # Now we can be sure the $part doesn't really matter.
1321: my $statusCount = $resource->simpleStatusCount();
1322: my @counts;
1323: foreach my $status (@statuses) {
1324: # decouple display order from the simpleStatusCount order
1325: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1326: if ($statusCount->[$slot]) {
1327: $overallstatus{$status}+=$statusCount->[$slot];
1328: $totalParts+=$statusCount->[$slot];
1329: }
1330: }
1331: }
1332: $return.= $td . $totalParts . ' parts: ';
1333: foreach my $status (@statuses) {
1334: if ($overallstatus{$status}) {
1335: $return.="<font color='" . $statusColors{$status} .
1336: "'>" . $overallstatus{$status} . ' '
1337: . $statusStrings{$status} . "</font>";
1338: }
1339: }
1340: $return.= $endtd;
1341: return $return;
1342: }
1343:
1344: my @preparedColumns = (\&render_resource, \&render_communication_status,
1345: \&render_quick_status, \&render_long_status,
1346: \&render_parts_summary_status);
1347:
1348: sub setDefault {
1349: my ($val, $default) = @_;
1350: if (!defined($val)) { return $default; }
1351: return $val;
1352: }
1353:
1354: sub cmp_title {
1355: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1356: $atitle=~s/^\s*//;
1357: $btitle=~s/^\s*//;
1358: return $atitle cmp $btitle;
1359: }
1360:
1361: sub render {
1362: my $args = shift;
1363: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1364: my $result = '';
1365: # Configure the renderer.
1366: my $cols = $args->{'cols'};
1367: if (!defined($cols)) {
1368: # no columns, no nav maps.
1369: return '';
1370: }
1371: my $mustCloseNavMap = 0;
1372: my $navmap;
1373: if (defined($args->{'navmap'})) {
1374: $navmap = $args->{'navmap'};
1375: }
1376:
1377: my $r = $args->{'r'};
1378: my $queryString = $args->{'queryString'};
1379: my $jump = $args->{'jump'};
1380: my $here = $args->{'here'};
1381: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1382: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1383: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1384: # before the current resource when using #current
1385:
1386: # If we were passed 'here' information, we are not rendering
1387: # after a folder manipulation, and we were not passed an
1388: # iterator, make sure we open the folders to show the "here"
1389: # marker
1390: my $filterHash = {};
1391: # Figure out what we're not displaying
1392: foreach (split(/\,/, $ENV{"form.filter"})) {
1393: if ($_) {
1394: $filterHash->{$_} = "1";
1395: }
1396: }
1397:
1398: # Filter: Remember filter function and add our own filter: Refuse
1399: # to show hidden resources unless the user can see them.
1400: my $userCanSeeHidden = advancedUser();
1401: my $filterFunc = setDefault($args->{'filterFunc'},
1402: sub {return 1;});
1403: if (!$userCanSeeHidden) {
1404: # Without renaming the filterfunc, the server seems to go into
1405: # an infinite loop
1406: my $oldFilterFunc = $filterFunc;
1407: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1408: &$oldFilterFunc($res);};
1409: }
1410:
1411: my $condition = 0;
1412: if ($ENV{'form.condition'}) {
1413: $condition = 1;
1414: }
1415:
1416: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1417: # Step 1: Check to see if we have a navmap
1418: if (!defined($navmap)) {
1419: $navmap = Apache::lonnavmaps::navmap->new();
1420: $mustCloseNavMap = 1;
1421: }
1422:
1423: # Step two: Locate what kind of here marker is necessary
1424: # Determine where the "here" marker is and where the screen jumps to.
1425:
1426: if ($ENV{'form.postsymb'}) {
1427: $here = $jump = &Apache::lonnet::symbclean($ENV{'form.postsymb'});
1428: } elsif ($ENV{'form.postdata'}) {
1429: # couldn't find a symb, is there a URL?
1430: my $currenturl = $ENV{'form.postdata'};
1431: #$currenturl=~s/^http\:\/\///;
1432: #$currenturl=~s/^[^\/]+//;
1433:
1434: $here = $jump = &Apache::lonnet::symbread($currenturl);
1435: }
1436:
1437: # Step three: Ensure the folders are open
1438: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1439: my $curRes;
1440: my $found = 0;
1441:
1442: # We only need to do this if we need to open the maps to show the
1443: # current position. This will change the counter so we can't count
1444: # for the jump marker with this loop.
1445: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1446: if (ref($curRes) && $curRes->symb() eq $here) {
1447: my $mapStack = $mapIterator->getStack();
1448:
1449: # Ensure the parent maps are open
1450: for my $map (@{$mapStack}) {
1451: if ($condition) {
1452: undef $filterHash->{$map->map_pc()};
1453: } else {
1454: $filterHash->{$map->map_pc()} = 1;
1455: }
1456: }
1457: $found = 1;
1458: }
1459: }
1460: }
1461:
1462: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1463: # If this is a click on a folder or something, we want to preserve the "here"
1464: # from the querystring, and get the new "jump" marker
1465: $here = $ENV{'form.here'};
1466: $jump = $ENV{'form.jump'};
1467: }
1468:
1469: my $it = $args->{'iterator'};
1470: if (!defined($it)) {
1471: # Construct a default iterator based on $ENV{'form.'} information
1472:
1473: # Step 1: Check to see if we have a navmap
1474: if (!defined($navmap)) {
1475: $navmap = Apache::lonnavmaps::navmap->new();
1476: $mustCloseNavMap = 1;
1477: }
1478:
1479: # See if we're being passed a specific map
1480: if ($args->{'iterator_map'}) {
1481: my $map = $args->{'iterator_map'};
1482: $map = $navmap->getResourceByUrl($map);
1483: my $firstResource = $map->map_start();
1484: my $finishResource = $map->map_finish();
1485:
1486: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1487: } else {
1488: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1489: }
1490: }
1491:
1492: # (re-)Locate the jump point, if any
1493: # Note this does not take filtering or hidden into account... need
1494: # to be fixed?
1495: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1496: my $curRes;
1497: my $foundJump = 0;
1498: my $counter = 0;
1499:
1500: while (($curRes = $mapIterator->next()) && !$foundJump) {
1501: if (ref($curRes)) { $counter++; }
1502:
1503: if (ref($curRes) && $jump eq $curRes->symb()) {
1504:
1505: # This is why we have to use the main iterator instead of the
1506: # potentially faster DFS: The count has to be the same, so
1507: # the order has to be the same, which DFS won't give us.
1508: $args->{'currentJumpIndex'} = $counter;
1509: $foundJump = 1;
1510: }
1511: }
1512:
1513: my $showParts = setDefault($args->{'showParts'}, 1);
1514: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1515: # keeps track of when the current resource is found,
1516: # so we can back up a few and put the anchor above the
1517: # current resource
1518: my $printKey = $args->{'printKey'};
1519: my $printCloseAll = $args->{'printCloseAll'};
1520: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1521:
1522: # Print key?
1523: if ($printKey) {
1524: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1525: my $date=localtime;
1526: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1527: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1528: if ($navmap->{LAST_CHECK}) {
1529: $result .=
1530: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1531: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1532: '</td><td align="center" valign="bottom"> '.
1533: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1534: '</td>';
1535: } else {
1536: $result .= '<td align="center" valign="bottom"> '.
1537: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1538: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1539: '</td>';
1540: }
1541:
1542: $result .= '</tr></table>';
1543: }
1544:
1545: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1546: my ($link,$text);
1547: if ($condition) {
1548: $link='"navmaps?condition=0&filter=&'.$queryString.
1549: '&here='.&Apache::lonnet::escape($here).'"';
1550: $text='Close All Folders';
1551: } else {
1552: $link='"navmaps?condition=1&filter=&'.$queryString.
1553: '&here='.&Apache::lonnet::escape($here).'"';
1554: $text='Open All Folders';
1555: }
1556: if ($args->{'caller'} eq 'navmapsdisplay') {
1557: &add_linkitem($args->{'linkitems'},'changefolder',
1558: 'location.href='.$link,$text);
1559: } else {
1560: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1561: }
1562: $result .= "\n";
1563: }
1564:
1565: # Check for any unread discussions in all resources.
1566: if ($args->{'caller'} eq 'navmapsdisplay') {
1567: &add_linkitem($args->{'linkitems'},'clearbubbles',
1568: 'document.clearbubbles.submit()',
1569: 'Mark all posts read');
1570: my $time=time;
1571: $result .= (<<END);
1572: <form name="clearbubbles" method="post" action="/adm/feedback">
1573: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1574: <input type="hidden" name="navtime" value="$time" />
1575: END
1576: if ($args->{'sort'} eq 'discussion') {
1577: my $totdisc = 0;
1578: my $haveDisc = '';
1579: my @allres=$navmap->retrieveResources();
1580: foreach my $resource (@allres) {
1581: if ($resource->hasDiscussion()) {
1582: my $ressymb;
1583: if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
1584: $ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
1585: } else {
1586: $ressymb = $resource->symb();
1587: }
1588: $haveDisc .= $ressymb.':';
1589: $totdisc ++;
1590: }
1591: }
1592: if ($totdisc > 0) {
1593: $haveDisc =~ s/:$//;
1594: $result .= (<<END);
1595: <input type="hidden" name="navmaps" value="$haveDisc" />
1596: </form>
1597: END
1598: }
1599: }
1600: $result.='</form>';
1601: }
1602:
1603: if ($args->{'caller'} eq 'navmapsdisplay') {
1604: $result .= '<table><tr><td>'.
1605: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1606: if ($ENV{'environment.remotenavmap'} ne 'on') {
1607: $result .= '<td> </td>';
1608: } else {
1609: $result .= '</tr><tr>';
1610: }
1611: $result.=&show_linkitems($args->{'linkitems'});
1612: if ($args->{'sort_html'}) {
1613: if ($ENV{'environment.remotenavmap'} ne 'on') {
1614: $result.='<td> </td><td> </td><td> </td>'.
1615: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1616: } else {
1617: $result.='</tr><tr><td align="left"><br />'.
1618: $args->{'sort_html'}.'</td></tr>';
1619: }
1620: }
1621: $result .= '</table>';
1622: } elsif ($args->{'sort_html'}) {
1623: $result.=$args->{'sort_html'};
1624: }
1625:
1626: $result .= "<br />\n";
1627: if ($r) {
1628: $r->print($result);
1629: $r->rflush();
1630: $result = "";
1631: }
1632: # End parameter setting
1633:
1634: # Data
1635: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1636: my $res = "Apache::lonnavmaps::resource";
1637: my %condenseStatuses =
1638: ( $res->NETWORK_FAILURE => 1,
1639: $res->NOTHING_SET => 1,
1640: $res->CORRECT => 1 );
1641: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1642:
1643: # Shared variables
1644: $args->{'counter'} = 0; # counts the rows
1645: $args->{'indentLevel'} = 0;
1646: $args->{'isNewBranch'} = 0;
1647: $args->{'condensed'} = 0;
1648: my $location=
1649: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1650: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='' border='0' />");
1651: $args->{'displayedHereMarker'} = 0;
1652:
1653: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1654: # since structure actually doesn't matter, except what map has what resources.
1655: if ($args->{'suppressEmptySequences'}) {
1656: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1657: $it->{FIRST_RESOURCE},
1658: $it->{FINISH_RESOURCE},
1659: {}, undef, 1);
1660: my $depth = 0;
1661: $dfsit->next();
1662: my $curRes = $dfsit->next();
1663: while ($depth > -1) {
1664: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1665: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1666:
1667: if (ref($curRes)) {
1668: # Parallel pre-processing: Do sequences have non-filtered-out children?
1669: if ($curRes->is_map()) {
1670: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1671: # Sequences themselves do not count as visible children,
1672: # unless those sequences also have visible children.
1673: # This means if a sequence appears, there's a "promise"
1674: # that there's something under it if you open it, somewhere.
1675: } else {
1676: # Not a sequence: if it's filtered, ignore it, otherwise
1677: # rise up the stack and mark the sequences as having children
1678: if (&$filterFunc($curRes)) {
1679: for my $sequence (@{$dfsit->getStack()}) {
1680: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1681: }
1682: }
1683: }
1684: }
1685: } continue {
1686: $curRes = $dfsit->next();
1687: }
1688: }
1689:
1690: my $displayedJumpMarker = 0;
1691: # Set up iteration.
1692: my $now = time();
1693: my $in24Hours = $now + 24 * 60 * 60;
1694: my $rownum = 0;
1695:
1696: # export "here" marker information
1697: $args->{'here'} = $here;
1698:
1699: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1700: my @resources;
1701: my $code='';# sub { !(shift->is_map();) };
1702: if ($args->{'sort'} eq 'title') {
1703: my $oldFilterFunc = $filterFunc;
1704: my $filterFunc=
1705: sub {
1706: my ($res)=@_;
1707: if ($res->is_map()) { return 0;}
1708: return &$oldFilterFunc($res);
1709: };
1710: @resources=$navmap->retrieveResources(undef,$filterFunc);
1711: @resources= sort { &cmp_title($a,$b) } @resources;
1712: } elsif ($args->{'sort'} eq 'duedate') {
1713: my $oldFilterFunc = $filterFunc;
1714: my $filterFunc=
1715: sub {
1716: my ($res)=@_;
1717: if (!$res->is_problem()) { return 0;}
1718: return &$oldFilterFunc($res);
1719: };
1720: @resources=$navmap->retrieveResources(undef,$filterFunc);
1721: @resources= sort {
1722: if ($a->duedate ne $b->duedate) {
1723: return $a->duedate cmp $b->duedate;
1724: }
1725: my $value=&cmp_title($a,$b);
1726: return $value;
1727: } @resources;
1728: } elsif ($args->{'sort'} eq 'discussion') {
1729: my $oldFilterFunc = $filterFunc;
1730: my $filterFunc=
1731: sub {
1732: my ($res)=@_;
1733: if (!$res->hasDiscussion() &&
1734: !$res->getFeedback() &&
1735: !$res->getErrors()) { return 0;}
1736: return &$oldFilterFunc($res);
1737: };
1738: @resources=$navmap->retrieveResources(undef,$filterFunc);
1739: @resources= sort { &cmp_title($a,$b) } @resources;
1740: } else {
1741: #unknow sort mechanism or default
1742: undef($args->{'sort'});
1743: }
1744:
1745:
1746: while (1) {
1747: if ($args->{'sort'}) {
1748: $curRes = shift(@resources);
1749: } else {
1750: $curRes = $it->next($closeAllPages);
1751: }
1752: if (!$curRes) { last; }
1753:
1754: # Maintain indentation level.
1755: if ($curRes == $it->BEGIN_MAP() ||
1756: $curRes == $it->BEGIN_BRANCH() ) {
1757: $args->{'indentLevel'}++;
1758: }
1759: if ($curRes == $it->END_MAP() ||
1760: $curRes == $it->END_BRANCH() ) {
1761: $args->{'indentLevel'}--;
1762: }
1763: # Notice new branches
1764: if ($curRes == $it->BEGIN_BRANCH()) {
1765: $args->{'isNewBranch'} = 1;
1766: }
1767:
1768: # If this isn't an actual resource, continue on
1769: if (!ref($curRes)) {
1770: next;
1771: }
1772:
1773: # If this has been filtered out, continue on
1774: if (!(&$filterFunc($curRes))) {
1775: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1776: next;
1777: }
1778:
1779: # If this is an empty sequence and we're filtering them, continue on
1780: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1781: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1782: next;
1783: }
1784:
1785: # If we're suppressing navmaps and this is a navmap, continue on
1786: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1787: next;
1788: }
1789:
1790: $args->{'counter'}++;
1791:
1792: # Does it have multiple parts?
1793: $args->{'multipart'} = 0;
1794: $args->{'condensed'} = 0;
1795: my @parts;
1796:
1797: # Decide what parts to show.
1798: if ($curRes->is_problem() && $showParts) {
1799: @parts = @{$curRes->parts()};
1800: $args->{'multipart'} = $curRes->multipart();
1801:
1802: if ($condenseParts) { # do the condensation
1803: if (!$curRes->opendate("0")) {
1804: @parts = ();
1805: $args->{'condensed'} = 1;
1806: }
1807: if (!$args->{'condensed'}) {
1808: # Decide whether to condense based on similarity
1809: my $status = $curRes->status($parts[0]);
1810: my $due = $curRes->duedate($parts[0]);
1811: my $open = $curRes->opendate($parts[0]);
1812: my $statusAllSame = 1;
1813: my $dueAllSame = 1;
1814: my $openAllSame = 1;
1815: for (my $i = 1; $i < scalar(@parts); $i++) {
1816: if ($curRes->status($parts[$i]) != $status){
1817: $statusAllSame = 0;
1818: }
1819: if ($curRes->duedate($parts[$i]) != $due ) {
1820: $dueAllSame = 0;
1821: }
1822: if ($curRes->opendate($parts[$i]) != $open) {
1823: $openAllSame = 0;
1824: }
1825: }
1826: # $*allSame is true if all the statuses were
1827: # the same. Now, if they are all the same and
1828: # match one of the statuses to condense, or they
1829: # are all open with the same due date, or they are
1830: # all OPEN_LATER with the same open date, display the
1831: # status of the first non-zero part (to get the 'correct'
1832: # status right, since 0 is never 'correct' or 'open').
1833: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1834: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1835: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1836: @parts = ($parts[0]);
1837: $args->{'condensed'} = 1;
1838: }
1839: }
1840: # Multipart problem with one part: always "condense" (happens
1841: # to match the desirable behavior)
1842: if ($curRes->countParts() == 1) {
1843: @parts = ($parts[0]);
1844: $args->{'condensed'} = 1;
1845: }
1846: }
1847: }
1848:
1849: # If the multipart problem was condensed, "forget" it was multipart
1850: if (scalar(@parts) == 1) {
1851: $args->{'multipart'} = 0;
1852: } else {
1853: # Add part 0 so we display it correctly.
1854: unshift @parts, '0';
1855: }
1856:
1857: {
1858: my ($src,$symb,$anchor,$stack);
1859: if ($args->{'sort'}) {
1860: my $it = $navmap->getIterator(undef, undef, undef, 1);
1861: while ( my $res=$it->next()) {
1862: if (ref($res) &&
1863: $res->symb() eq $curRes->symb()) { last; }
1864: }
1865: $stack=$it->getStack();
1866: } else {
1867: $stack=$it->getStack();
1868: }
1869: ($src,$symb,$anchor)=getLinkForResource($stack);
1870: if (defined($anchor)) { $anchor='#'.$anchor; }
1871: my $srcHasQuestion = $src =~ /\?/;
1872: $args->{"resourceLink"} = $src.
1873: ($srcHasQuestion?'&':'?') .
1874: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1875: }
1876: # Now, we've decided what parts to show. Loop through them and
1877: # show them.
1878: foreach my $part (@parts) {
1879: $rownum ++;
1880: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1881:
1882: $result .= " <tr bgcolor='$backgroundColor'>\n";
1883:
1884: # Set up some data about the parts that the cols might want
1885: my $filter = $it->{FILTER};
1886:
1887: # Now, display each column.
1888: foreach my $col (@$cols) {
1889: my $colHTML = '';
1890: if (ref($col)) {
1891: $colHTML .= &$col($curRes, $part, $args);
1892: } else {
1893: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1894: }
1895:
1896: # If this is the first column and it's time to print
1897: # the anchor, do so
1898: if ($col == $cols->[0] &&
1899: $args->{'counter'} == $args->{'currentJumpIndex'} -
1900: $currentJumpDelta) {
1901: # Jam the anchor after the <td> tag;
1902: # necessary for valid HTML (which Mozilla requires)
1903: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1904: $displayedJumpMarker = 1;
1905: }
1906: $result .= $colHTML . "\n";
1907: }
1908: $result .= " </tr>\n";
1909: $args->{'isNewBranch'} = 0;
1910: }
1911:
1912: if ($r && $rownum % 20 == 0) {
1913: $r->print($result);
1914: $result = "";
1915: $r->rflush();
1916: }
1917: } continue {
1918: if ($r) {
1919: # If we have the connection, make sure the user is still connected
1920: my $c = $r->connection;
1921: if ($c->aborted()) {
1922: # Who cares what we do, nobody will see it anyhow.
1923: return '';
1924: }
1925: }
1926: }
1927:
1928: # Print out the part that jumps to #curloc if it exists
1929: # delay needed because the browser is processing the jump before
1930: # it finishes rendering, so it goes to the wrong place!
1931: # onload might be better, but this routine has no access to that.
1932: # On mozilla, the 0-millisecond timeout seems to prevent this;
1933: # it's quite likely this might fix other browsers, too, and
1934: # certainly won't hurt anything.
1935: if ($displayedJumpMarker) {
1936: $result .= "
1937: <script>
1938: if (location.href.indexOf('#curloc')==-1) {
1939: setTimeout(\"location += '#curloc';\", 0)
1940: }
1941: </script>";
1942: }
1943:
1944: $result .= "</table>";
1945:
1946: if ($r) {
1947: $r->print($result);
1948: $result = "";
1949: $r->rflush();
1950: }
1951:
1952: return $result;
1953: }
1954:
1955: sub add_linkitem {
1956: my ($linkitems,$name,$cmd,$text)=@_;
1957: $$linkitems{$name}{'cmd'}=$cmd;
1958: $$linkitems{$name}{'text'}=&mt($text);
1959: }
1960:
1961: sub show_linkitems {
1962: my ($linkitems)=@_;
1963: my @linkorder = ("blank","launchnav","closenav","firsthomework",
1964: "everything","uncompleted","changefolder","clearbubbles");
1965:
1966: my $result .= (<<ENDBLOCK);
1967: <td align="left">
1968: <script type="text/javascript">
1969: function changeNavDisplay () {
1970: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1971: ENDBLOCK
1972: foreach my $link (@linkorder) {
1973: $result.= "if (navchoice == '$link') {".
1974: $linkitems->{$link}{'cmd'}."}\n";
1975: }
1976: $result.='}
1977: </script>
1978: <form name="linkitems" method="post">
1979: <nobr><select name="toplink">'."\n";
1980: foreach my $link (@linkorder) {
1981: if (defined($linkitems->{$link})) {
1982: if ($linkitems->{$link}{'text'} ne '') {
1983: $result .= ' <option value="'.$link.'">'.
1984: $linkitems->{$link}{'text'}."</option>\n";
1985: }
1986: }
1987: }
1988: $result .= '</select> <input type="button" name="chgnav"
1989: value="Go" onClick="javascript:changeNavDisplay()" />
1990: </nobr></form></td>'."\n";
1991:
1992: return $result;
1993: }
1994:
1995: 1;
1996:
1997: package Apache::lonnavmaps::navmap;
1998:
1999: =pod
2000:
2001: =head1 Object: Apache::lonnavmaps::navmap
2002:
2003: =head2 Overview
2004:
2005: The navmap object's job is to provide access to the resources
2006: in the course as Apache::lonnavmaps::resource objects, and to
2007: query and manage the relationship between those resource objects.
2008:
2009: Generally, you'll use the navmap object in one of three basic ways.
2010: In order of increasing complexity and power:
2011:
2012: =over 4
2013:
2014: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2015: various ways to obtain resource objects, based on various identifiers.
2016: Use this when you want to request information about one object or
2017: a handful of resources you already know the identities of, from some
2018: other source. For more about Ids, Symbs, and MapPcs, see the
2019: Resource documentation. Note that Url should be a B<last resort>,
2020: not your first choice; it only works when there is only one
2021: instance of the resource in the course, which only applies to
2022: maps, and even that may change in the future.
2023:
2024: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2025: retrieves resources matching some criterion and returns them
2026: in a flat array, with no structure information. Use this when
2027: you are manipulating a series of resources, based on what map
2028: the are in, but do not care about branching, or exactly how
2029: the maps and resources are related. This is the most common case.
2030:
2031: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2032: the course's navmap in various ways without writing the traversal
2033: code yourself. See iterator documentation below. Use this when
2034: you need to know absolutely everything about the course, including
2035: branches and the precise relationship between maps and resources.
2036:
2037: =back
2038:
2039: =head2 Creation And Destruction
2040:
2041: To create a navmap object, use the following function:
2042:
2043: =over 4
2044:
2045: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2046:
2047: Creates a new navmap object. Returns the navmap object if this is
2048: successful, or B<undef> if not.
2049:
2050: =back
2051:
2052: =head2 Methods
2053:
2054: =over 4
2055:
2056: =item * B<getIterator>(first, finish, filter, condition):
2057:
2058: See iterator documentation below.
2059:
2060: =cut
2061:
2062: use strict;
2063: use GDBM_File;
2064:
2065: sub new {
2066: # magic invocation to create a class instance
2067: my $proto = shift;
2068: my $class = ref($proto) || $proto;
2069: my $self = {};
2070:
2071: # Resource cache stores navmap resources as we reference them. We generate
2072: # them on-demand so we don't pay for creating resources unless we use them.
2073: $self->{RESOURCE_CACHE} = {};
2074:
2075: # Network failure flag, if we accessed the course or user opt and
2076: # failed
2077: $self->{NETWORK_FAILURE} = 0;
2078:
2079: # tie the nav hash
2080:
2081: my %navmaphash;
2082: my %parmhash;
2083: my $courseFn = $ENV{"request.course.fn"};
2084: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2085: &GDBM_READER(), 0640))) {
2086: return undef;
2087: }
2088:
2089: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2090: &GDBM_READER(), 0640)))
2091: {
2092: untie %{$self->{PARM_HASH}};
2093: return undef;
2094: }
2095:
2096: $self->{NAV_HASH} = \%navmaphash;
2097: $self->{PARM_HASH} = \%parmhash;
2098: $self->{PARM_CACHE} = {};
2099:
2100: bless($self);
2101:
2102: return $self;
2103: }
2104:
2105: sub generate_course_user_opt {
2106: my $self = shift;
2107: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2108:
2109: my $uname=$ENV{'user.name'};
2110: my $udom=$ENV{'user.domain'};
2111: my $uhome=$ENV{'user.home'};
2112: my $cid=$ENV{'request.course.id'};
2113: my $chome=$ENV{'course.'.$cid.'.home'};
2114: my ($cdom,$cnum)=split(/\_/,$cid);
2115:
2116: my $userprefix=$uname.'_'.$udom.'_';
2117:
2118: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
2119: unless ($uhome eq 'no_host') {
2120: # ------------------------------------------------- Get coursedata (if present)
2121: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
2122: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
2123: ':resourcedata',$chome);
2124: # Check for network failure
2125: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
2126: $self->{NETWORK_FAILURE} = 1;
2127: } elsif ($reply!~/^error\:/) {
2128: $courserdatas{$cid}=$reply;
2129: $courserdatas{$cid.'.last_cache'}=time;
2130: }
2131: }
2132: foreach (split(/\&/,$courserdatas{$cid})) {
2133: my ($name,$value)=split(/\=/,$_);
2134: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
2135: &Apache::lonnet::unescape($value);
2136: }
2137: # --------------------------------------------------- Get userdata (if present)
2138: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
2139: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
2140: if ($reply!~/^error\:/) {
2141: $userrdatas{$uname.'___'.$udom}=$reply;
2142: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
2143: }
2144: # check to see if network failed
2145: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
2146: {
2147: $self->{NETWORK_FAILURE} = 1;
2148: }
2149: }
2150: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
2151: my ($name,$value)=split(/\=/,$_);
2152: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
2153: &Apache::lonnet::unescape($value);
2154: }
2155: $self->{COURSE_OPT} = \%courseopt;
2156: $self->{USER_OPT} = \%useropt;
2157: }
2158:
2159: $self->{COURSE_USER_OPT_GENERATED} = 1;
2160:
2161: return;
2162: }
2163:
2164: sub generate_email_discuss_status {
2165: my $self = shift;
2166: my $symb = shift;
2167: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2168:
2169: my $cid=$ENV{'request.course.id'};
2170: my ($cdom,$cnum)=split(/\_/,$cid);
2171:
2172: my %emailstatus = &Apache::lonnet::dump('email_status');
2173: my $logoutTime = $emailstatus{'logout'};
2174: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
2175: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2176: $courseLeaveTime : $logoutTime);
2177: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2178: $cdom, $cnum);
2179: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2180: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
2181: my %lastreadtime = ();
2182: foreach (keys %lastread) {
2183: my $key = $_;
2184: $key =~ s/_lastread$//;
2185: $lastreadtime{$key} = $lastread{$_};
2186: }
2187:
2188: my %feedback=();
2189: my %error=();
2190: my $keys = &Apache::lonnet::reply('keys:'.
2191: $ENV{'user.domain'}.':'.
2192: $ENV{'user.name'}.':nohist_email',
2193: $ENV{'user.home'});
2194:
2195: foreach my $msgid (split(/\&/, $keys)) {
2196: $msgid=&Apache::lonnet::unescape($msgid);
2197: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2198: my $plain=
2199: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2200: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2201: my ($what,$url)=($1,$2);
2202: if ($what eq 'Error') {
2203: $error{$url}.=','.$msgid;
2204: } else {
2205: $feedback{$url}.=','.$msgid;
2206: }
2207: }
2208: }
2209: }
2210:
2211: #url's of resources that have feedbacks
2212: $self->{FEEDBACK} = \%feedback;
2213: #or errors
2214: $self->{ERROR_MSG} = \%error;
2215: $self->{DISCUSSION_TIME} = \%discussiontime;
2216: $self->{EMAIL_STATUS} = \%emailstatus;
2217: $self->{LAST_READ} = \%lastreadtime;
2218:
2219: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2220: }
2221:
2222: sub get_user_data {
2223: my $self = shift;
2224: if ($self->{RETRIEVED_USER_DATA}) { return; }
2225:
2226: # Retrieve performance data on problems
2227: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
2228: $ENV{'user.domain'},
2229: $ENV{'user.name'});
2230: $self->{STUDENT_DATA} = \%student_data;
2231:
2232: $self->{RETRIEVED_USER_DATA} = 1;
2233: }
2234:
2235: # Internal function: Takes a key to look up in the nav hash and implements internal
2236: # memory caching of that key.
2237: sub navhash {
2238: my $self = shift; my $key = shift;
2239: return $self->{NAV_HASH}->{$key};
2240: }
2241:
2242: =pod
2243:
2244: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2245: false otherwise. Undefined course maps indicate an error somewhere in
2246: LON-CAPA, and you will not be able to proceed with using the navmap.
2247: See the B<NAV> screen for an example of using this.
2248:
2249: =cut
2250:
2251: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2252: sub courseMapDefined {
2253: my $self = shift;
2254: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
2255:
2256: my $firstres = $self->navhash("map_start_$uri");
2257: my $lastres = $self->navhash("map_finish_$uri");
2258: return $firstres && $lastres;
2259: }
2260:
2261: sub getIterator {
2262: my $self = shift;
2263: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2264: shift, undef, shift,
2265: shift, shift);
2266: return $iterator;
2267: }
2268:
2269: # Private method: Does the given resource (as a symb string) have
2270: # current discussion? Returns 0 if chat/mail data not extracted.
2271: sub hasDiscussion {
2272: my $self = shift;
2273: my $symb = shift;
2274:
2275: $self->generate_email_discuss_status();
2276:
2277: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2278:
2279: #return defined($self->{DISCUSSION_TIME}->{$symb});
2280:
2281: # backward compatibility (bulletin boards used to be 'wrapped')
2282: my $ressymb = $symb;
2283: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
2284: unless ($ressymb =~ m|adm/wrapper/adm|) {
2285: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
2286: }
2287: }
2288:
2289: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2290: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2291: } else {
2292: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2293: 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).
2294: }
2295: }
2296:
2297: # Private method: Does the given resource (as a symb string) have
2298: # current feedback? Returns the string in the feedback hash, which
2299: # will be false if it does not exist.
2300: sub getFeedback {
2301: my $self = shift;
2302: my $symb = shift;
2303:
2304: $self->generate_email_discuss_status();
2305:
2306: if (!defined($self->{FEEDBACK})) { return ""; }
2307:
2308: return $self->{FEEDBACK}->{$symb};
2309: }
2310:
2311: # Private method: Get the errors for that resource (by source).
2312: sub getErrors {
2313: my $self = shift;
2314: my $src = shift;
2315:
2316: $self->generate_email_discuss_status();
2317:
2318: if (!defined($self->{ERROR_MSG})) { return ""; }
2319: return $self->{ERROR_MSG}->{$src};
2320: }
2321:
2322: =pod
2323:
2324: =item * B<getById>(id):
2325:
2326: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2327: object for that resource. This method, or other methods that use it
2328: (as in the resource object) is the only proper way to obtain a
2329: resource object.
2330:
2331: =item * B<getBySymb>(symb):
2332:
2333: Based on the symb of the resource, get a resource object for that
2334: resource. This is one of the proper ways to get a resource object.
2335:
2336: =item * B<getMapByMapPc>(map_pc):
2337:
2338: Based on the map_pc of the resource, get a resource object for
2339: the given map. This is one of the proper ways to get a resource object.
2340:
2341: =cut
2342:
2343: # The strategy here is to cache the resource objects, and only construct them
2344: # as we use them. The real point is to prevent reading any more from the tied
2345: # hash then we have to, which should hopefully alleviate speed problems.
2346:
2347: sub getById {
2348: my $self = shift;
2349: my $id = shift;
2350:
2351: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2352: {
2353: return $self->{RESOURCE_CACHE}->{$id};
2354: }
2355:
2356: # resource handles inserting itself into cache.
2357: # Not clear why the quotes are necessary, but as of this
2358: # writing it doesn't work without them.
2359: return "Apache::lonnavmaps::resource"->new($self, $id);
2360: }
2361:
2362: sub getBySymb {
2363: my $self = shift;
2364: my $symb = shift;
2365:
2366: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2367: my $map = $self->getResourceByUrl($mapUrl);
2368: my $returnvalue = undef;
2369: if (ref($map)) {
2370: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2371: }
2372: return $returnvalue;
2373: }
2374:
2375: sub getByMapPc {
2376: my $self = shift;
2377: my $map_pc = shift;
2378: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2379: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2380: return $self->getById($map_id);
2381: }
2382:
2383: =pod
2384:
2385: =item * B<firstResource>():
2386:
2387: Returns a resource object reference corresponding to the first
2388: resource in the navmap.
2389:
2390: =cut
2391:
2392: sub firstResource {
2393: my $self = shift;
2394: my $firstResource = $self->navhash('map_start_' .
2395: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2396: return $self->getById($firstResource);
2397: }
2398:
2399: =pod
2400:
2401: =item * B<finishResource>():
2402:
2403: Returns a resource object reference corresponding to the last resource
2404: in the navmap.
2405:
2406: =cut
2407:
2408: sub finishResource {
2409: my $self = shift;
2410: my $firstResource = $self->navhash('map_finish_' .
2411: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2412: return $self->getById($firstResource);
2413: }
2414:
2415: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2416: # the actual lookup; parmval caches the results.
2417: sub parmval {
2418: my $self = shift;
2419: my ($what,$symb)=@_;
2420: my $hashkey = $what."|||".$symb;
2421:
2422: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2423: return $self->{PARM_CACHE}->{$hashkey};
2424: }
2425:
2426: my $result = $self->parmval_real($what, $symb);
2427: $self->{PARM_CACHE}->{$hashkey} = $result;
2428: return $result;
2429: }
2430:
2431: sub parmval_real {
2432: my $self = shift;
2433: my ($what,$symb,$recurse) = @_;
2434:
2435: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2436: $self->generate_course_user_opt();
2437:
2438: my $cid=$ENV{'request.course.id'};
2439: my $csec=$ENV{'request.course.sec'};
2440: my $uname=$ENV{'user.name'};
2441: my $udom=$ENV{'user.domain'};
2442:
2443: unless ($symb) { return ''; }
2444: my $result='';
2445:
2446: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2447:
2448: # ----------------------------------------------------- Cascading lookup scheme
2449: my $rwhat=$what;
2450: $what=~s/^parameter\_//;
2451: $what=~s/\_/\./;
2452:
2453: my $symbparm=$symb.'.'.$what;
2454: my $mapparm=$mapname.'___(all).'.$what;
2455: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2456:
2457: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2458: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2459: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2460:
2461: my $courselevel= $usercourseprefix.'.'.$what;
2462: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2463: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2464:
2465: my $useropt = $self->{USER_OPT};
2466: my $courseopt = $self->{COURSE_OPT};
2467: my $parmhash = $self->{PARM_HASH};
2468:
2469: # ---------------------------------------------------------- first, check user
2470: if ($uname and defined($useropt)) {
2471: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2472: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2473: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2474: }
2475:
2476: # ------------------------------------------------------- second, check course
2477: if ($csec and defined($courseopt)) {
2478: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2479: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2480: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2481: }
2482:
2483: if (defined($courseopt)) {
2484: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2485: }
2486:
2487: # ----------------------------------------------------- third, check map parms
2488:
2489: my $thisparm=$$parmhash{$symbparm};
2490: if (defined($thisparm)) { return $thisparm; }
2491:
2492: # ----------------------------------------------------- fourth , check default
2493:
2494: my $meta_rwhat=$rwhat;
2495: $meta_rwhat=~s/\./_/g;
2496: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2497: if (defined($default)) { return $default}
2498: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2499: if (defined($default)) { return $default}
2500:
2501: # --------------------------------------------------- fifth, check more course
2502: if (defined($courseopt)) {
2503: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2504: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2505: }
2506:
2507: # --------------------------------------------------- sixth , cascade up parts
2508:
2509: my ($space,@qualifier)=split(/\./,$rwhat);
2510: my $qualifier=join('.',@qualifier);
2511: unless ($space eq '0') {
2512: my @parts=split(/_/,$space);
2513: my $id=pop(@parts);
2514: my $part=join('_',@parts);
2515: if ($part eq '') { $part='0'; }
2516: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2517: if (defined($partgeneral)) { return $partgeneral; }
2518: }
2519: if ($recurse) { return undef; }
2520: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2521: if (defined($pack_def)) { return $pack_def; }
2522: return '';
2523: }
2524:
2525: =pod
2526:
2527: =item * B<getResourceByUrl>(url):
2528:
2529: Retrieves a resource object by URL of the resource. If passed a
2530: resource object, it will simply return it, so it is safe to use this
2531: method in code like "$res = $navmap->getResourceByUrl($res)", if
2532: you're not sure if $res is already an object, or just a URL. If the
2533: resource appears multiple times in the course, only the first instance
2534: will be returned. As a result, this is probably useful only for maps.
2535:
2536: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2537:
2538: The map is a specification of a map to retreive the resources from,
2539: either as a url or as an object. The filterFunc is a reference to a
2540: function that takes a resource object as its one argument and returns
2541: true if the resource should be included, or false if it should not
2542: be. If recursive is true, the map will be recursively examined,
2543: otherwise it will not be. If bailout is true, the function will return
2544: as soon as it finds a resource, if false it will finish. If showall is
2545: true it will not hide maps that contain nothing but one other map. By
2546: default, the map is the top-level map of the course, filterFunc is a
2547: function that always returns 1, recursive is true, bailout is false,
2548: showall is false. The resources will be returned in a list containing
2549: the resource objects for the corresponding resources, with B<no
2550: structure information> in the list; regardless of branching,
2551: recursion, etc., it will be a flat list.
2552:
2553: Thus, this is suitable for cases where you don't want the structure,
2554: just a list of all resources. It is also suitable for finding out how
2555: many resources match a given description; for this use, if all you
2556: want to know is if I<any> resources match the description, the bailout
2557: parameter will allow you to avoid potentially expensive enumeration of
2558: all matching resources.
2559:
2560: =item * B<hasResource>(map, filterFunc, recursive):
2561:
2562: Convience method for
2563:
2564: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2565:
2566: which will tell whether the map has resources matching the description
2567: in the filter function.
2568:
2569: =cut
2570:
2571:
2572: sub getResourceByUrl {
2573: my $self = shift;
2574: my $resUrl = shift;
2575:
2576: if (ref($resUrl)) { return $resUrl; }
2577:
2578: $resUrl = &Apache::lonnet::clutter($resUrl);
2579: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2580: if ($resId =~ /,/) {
2581: $resId = (split (/,/, $resId))[0];
2582: }
2583: if (!$resId) { return ''; }
2584: return $self->getById($resId);
2585: }
2586:
2587: sub retrieveResources {
2588: my $self = shift;
2589: my $map = shift;
2590: my $filterFunc = shift;
2591: if (!defined ($filterFunc)) {
2592: $filterFunc = sub {return 1;};
2593: }
2594: my $recursive = shift;
2595: if (!defined($recursive)) { $recursive = 1; }
2596: my $bailout = shift;
2597: if (!defined($bailout)) { $bailout = 0; }
2598: my $showall = shift;
2599: # Create the necessary iterator.
2600: if (!ref($map)) { # assume it's a url of a map.
2601: $map = $self->getResourceByUrl($map);
2602: }
2603:
2604: # If nothing was passed, assume top-level map
2605: if (!$map) {
2606: $map = $self->getById('0.0');
2607: }
2608:
2609: # Check the map's validity.
2610: if (!$map->is_map()) {
2611: # Oh, to throw an exception.... how I'd love that!
2612: return ();
2613: }
2614:
2615: # Get an iterator.
2616: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2617: undef, $recursive, $showall);
2618:
2619: my @resources = ();
2620:
2621: # Run down the iterator and collect the resources.
2622: my $curRes;
2623:
2624: while ($curRes = $it->next()) {
2625: if (ref($curRes)) {
2626: if (!&$filterFunc($curRes)) {
2627: next;
2628: }
2629:
2630: push @resources, $curRes;
2631:
2632: if ($bailout) {
2633: return @resources;
2634: }
2635: }
2636:
2637: }
2638:
2639: return @resources;
2640: }
2641:
2642: sub hasResource {
2643: my $self = shift;
2644: my $map = shift;
2645: my $filterFunc = shift;
2646: my $recursive = shift;
2647:
2648: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2649: }
2650:
2651: 1;
2652:
2653: package Apache::lonnavmaps::iterator;
2654: use WeakRef;
2655: =pod
2656:
2657: =back
2658:
2659: =head1 Object: navmap Iterator
2660:
2661: An I<iterator> encapsulates the logic required to traverse a data
2662: structure. navmap uses an iterator to traverse the course map
2663: according to the criteria you wish to use.
2664:
2665: To obtain an iterator, call the B<getIterator>() function of a
2666: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2667: directly.) This will return a reference to the iterator:
2668:
2669: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2670:
2671: To get the next thing from the iterator, call B<next>:
2672:
2673: C<my $nextThing = $resourceIterator-E<gt>next()>
2674:
2675: getIterator behaves as follows:
2676:
2677: =over 4
2678:
2679: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2680:
2681: All parameters are optional. firstResource is a resource reference
2682: corresponding to where the iterator should start. It defaults to
2683: navmap->firstResource() for the corresponding nav map. finishResource
2684: corresponds to where you want the iterator to end, defaulting to
2685: navmap->finishResource(). filterHash is a hash used as a set
2686: containing strings representing the resource IDs, defaulting to
2687: empty. Condition is a 1 or 0 that sets what to do with the filter
2688: hash: If a 0, then only resources that exist IN the filterHash will be
2689: recursed on. If it is a 1, only resources NOT in the filterHash will
2690: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2691: false (default), the iterator will only return the first level of map
2692: that is not just a single, 'redirecting' map. If true, the iterator
2693: will return all information, starting with the top-level map,
2694: regardless of content. returnTopMap, if true (default false), will
2695: cause the iterator to return the top-level map object (resource 0.0)
2696: before anything else.
2697:
2698: Thus, by default, only top-level resources will be shown. Change the
2699: condition to a 1 without changing the hash, and all resources will be
2700: shown. Changing the condition to 1 and including some values in the
2701: hash will allow you to selectively suppress parts of the navmap, while
2702: leaving it on 0 and adding things to the hash will allow you to
2703: selectively add parts of the nav map. See the handler code for
2704: examples.
2705:
2706: The iterator will return either a reference to a resource object, or a
2707: token representing something in the map, such as the beginning of a
2708: new branch. The possible tokens are:
2709:
2710: =over 4
2711:
2712: =item * B<END_ITERATOR>:
2713:
2714: The iterator has returned all that it's going to. Further calls to the
2715: iterator will just produce more of these. This is a "false" value, and
2716: is the only false value the iterator which will be returned, so it can
2717: be used as a loop sentinel.
2718:
2719: =item * B<BEGIN_MAP>:
2720:
2721: A new map is being recursed into. This is returned I<after> the map
2722: resource itself is returned.
2723:
2724: =item * B<END_MAP>:
2725:
2726: The map is now done.
2727:
2728: =item * B<BEGIN_BRANCH>:
2729:
2730: A branch is now starting. The next resource returned will be the first
2731: in that branch.
2732:
2733: =item * B<END_BRANCH>:
2734:
2735: The branch is now done.
2736:
2737: =back
2738:
2739: The tokens are retreivable via methods on the iterator object, i.e.,
2740: $iterator->END_MAP.
2741:
2742: Maps can contain empty resources. The iterator will automatically skip
2743: over such resources, but will still treat the structure
2744: correctly. Thus, a complicated map with several branches, but
2745: consisting entirely of empty resources except for one beginning or
2746: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2747: but only one resource will be returned.
2748:
2749: =back
2750:
2751: =head2 Normal Usage
2752:
2753: Normal usage of the iterator object is to do the following:
2754:
2755: my $it = $navmap->getIterator([your params here]);
2756: my $curRes;
2757: while ($curRes = $it->next()) {
2758: [your logic here]
2759: }
2760:
2761: Note that inside of the loop, it's frequently useful to check if
2762: "$curRes" is a reference or not with the reference function; only
2763: resource objects will be references, and any non-references will
2764: be the tokens described above.
2765:
2766: Also note there is some old code floating around that trys to track
2767: the depth of the iterator to see when it's done; do not copy that
2768: code. It is difficult to get right and harder to understand then
2769: this. They should be migrated to this new style.
2770:
2771: =cut
2772:
2773: # Here are the tokens for the iterator:
2774:
2775: sub END_ITERATOR { return 0; }
2776: sub BEGIN_MAP { return 1; } # begining of a new map
2777: sub END_MAP { return 2; } # end of the map
2778: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2779: sub END_BRANCH { return 4; } # end of a branch
2780: sub FORWARD { return 1; } # go forward
2781: sub BACKWARD { return 2; }
2782:
2783: sub min {
2784: (my $a, my $b) = @_;
2785: if ($a < $b) { return $a; } else { return $b; }
2786: }
2787:
2788: sub new {
2789: # magic invocation to create a class instance
2790: my $proto = shift;
2791: my $class = ref($proto) || $proto;
2792: my $self = {};
2793:
2794: weaken($self->{NAV_MAP} = shift);
2795: return undef unless ($self->{NAV_MAP});
2796:
2797: # Handle the parameters
2798: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2799: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2800:
2801: # If the given resources are just the ID of the resource, get the
2802: # objects
2803: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2804: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2805: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2806: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2807:
2808: $self->{FILTER} = shift;
2809:
2810: # A hash, used as a set, of resource already seen
2811: $self->{ALREADY_SEEN} = shift;
2812: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2813: $self->{CONDITION} = shift;
2814:
2815: # Do we want to automatically follow "redirection" maps?
2816: $self->{FORCE_TOP} = shift;
2817:
2818: # Do we want to return the top-level map object (resource 0.0)?
2819: $self->{RETURN_0} = shift;
2820: # have we done that yet?
2821: $self->{HAVE_RETURNED_0} = 0;
2822:
2823: # Now, we need to pre-process the map, by walking forward and backward
2824: # over the parts of the map we're going to look at.
2825:
2826: # The processing steps are exactly the same, except for a few small
2827: # changes, so I bundle those up in the following list of two elements:
2828: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2829: # first_resource).
2830: # This prevents writing nearly-identical code twice.
2831: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2832: 'FIRST_RESOURCE'],
2833: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2834: 'FINISH_RESOURCE'] );
2835:
2836: my $maxDepth = 0; # tracks max depth
2837:
2838: # If there is only one resource in this map, and it's a map, we
2839: # want to remember that, so the user can ask for the first map
2840: # that isn't just a redirector.
2841: my $resource; my $resourceCount = 0;
2842:
2843: # Documentation on this algorithm can be found in the CVS repository at
2844: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2845: # in that file.
2846: # **1**
2847:
2848: foreach my $pass (@iterations) {
2849: my $direction = $pass->[0];
2850: my $valName = $pass->[1];
2851: my $nextResourceMethod = $pass->[2];
2852: my $firstResourceName = $pass->[3];
2853:
2854: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2855: $self->{FIRST_RESOURCE},
2856: $self->{FINISH_RESOURCE},
2857: {}, undef, 0, $direction);
2858:
2859: # prime the recursion
2860: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2861: $iterator->next();
2862: my $curRes = $iterator->next();
2863: my $depth = 1;
2864: while ($depth > 0) {
2865: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2866: if ($curRes == $iterator->END_MAP()) { $depth--; }
2867:
2868: if (ref($curRes)) {
2869: # If there's only one resource, this will save it
2870: # we have to filter empty resources from consideration here,
2871: # or even "empty", redirecting maps have two (start & finish)
2872: # or three (start, finish, plus redirector)
2873: if($direction == FORWARD && $curRes->src()) {
2874: $resource = $curRes; $resourceCount++;
2875: }
2876: my $resultingVal = $curRes->{DATA}->{$valName};
2877: my $nextResources = $curRes->$nextResourceMethod();
2878: my $nextCount = scalar(@{$nextResources});
2879:
2880: if ($nextCount == 1) { # **3**
2881: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2882: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2883: }
2884:
2885: if ($nextCount > 1) { # **4**
2886: foreach my $res (@{$nextResources}) {
2887: my $current = $res->{DATA}->{$valName} || 999999999;
2888: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2889: }
2890: }
2891: }
2892:
2893: # Assign the final val (**2**)
2894: if (ref($curRes) && $direction == BACKWARD()) {
2895: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2896: $curRes->{DATA}->{BOT_UP_VAL});
2897:
2898: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2899: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2900: }
2901:
2902: $curRes = $iterator->next();
2903: }
2904: }
2905:
2906: # Check: Was this only one resource, a map?
2907: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2908: my $firstResource = $resource->map_start();
2909: my $finishResource = $resource->map_finish();
2910: return
2911: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2912: $finishResource, $self->{FILTER},
2913: $self->{ALREADY_SEEN},
2914: $self->{CONDITION},
2915: $self->{FORCE_TOP});
2916:
2917: }
2918:
2919: # Set up some bookkeeping information.
2920: $self->{CURRENT_DEPTH} = 0;
2921: $self->{MAX_DEPTH} = $maxDepth;
2922: $self->{STACK} = [];
2923: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2924: $self->{FINISHED} = 0; # When true, the iterator has finished
2925:
2926: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2927: push @{$self->{STACK}}, [];
2928: }
2929:
2930: # Prime the recursion w/ the first resource **5**
2931: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2932: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2933:
2934: bless ($self);
2935:
2936: return $self;
2937: }
2938:
2939: sub next {
2940: my $self = shift;
2941: my $closeAllPages=shift;
2942: if ($self->{FINISHED}) {
2943: return END_ITERATOR();
2944: }
2945:
2946: # If we want to return the top-level map object, and haven't yet,
2947: # do so.
2948: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2949: $self->{HAVE_RETURNED_0} = 1;
2950: return $self->{NAV_MAP}->getById('0.0');
2951: }
2952:
2953: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2954: # grab the next from the recursive iterator
2955: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2956:
2957: # is it a begin or end map? If so, update the depth
2958: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2959: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2960:
2961: # Are we back at depth 0? If so, stop recursing
2962: if ($self->{RECURSIVE_DEPTH} == 0) {
2963: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2964: }
2965:
2966: return $next;
2967: }
2968:
2969: if (defined($self->{FORCE_NEXT})) {
2970: my $tmp = $self->{FORCE_NEXT};
2971: $self->{FORCE_NEXT} = undef;
2972: return $tmp;
2973: }
2974:
2975: # Have we not yet begun? If not, return BEGIN_MAP and
2976: # remember we've started.
2977: if ( !$self->{STARTED} ) {
2978: $self->{STARTED} = 1;
2979: return $self->BEGIN_MAP();
2980: }
2981:
2982: # Here's the guts of the iterator.
2983:
2984: # Find the next resource, if any.
2985: my $found = 0;
2986: my $i = $self->{MAX_DEPTH};
2987: my $newDepth;
2988: my $here;
2989: while ( $i >= 0 && !$found ) {
2990: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2991: $here = pop @{$self->{STACK}->[$i]}; # **7**
2992: $found = 1;
2993: $newDepth = $i;
2994: }
2995: $i--;
2996: }
2997:
2998: # If we still didn't find anything, we're done.
2999: if ( !$found ) {
3000: # We need to get back down to the correct branch depth
3001: if ( $self->{CURRENT_DEPTH} > 0 ) {
3002: $self->{CURRENT_DEPTH}--;
3003: return END_BRANCH();
3004: } else {
3005: $self->{FINISHED} = 1;
3006: return END_MAP();
3007: }
3008: }
3009:
3010: # If this is not a resource, it must be an END_BRANCH marker we want
3011: # to return directly.
3012: if (!ref($here)) { # **8**
3013: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3014: $self->{CURRENT_DEPTH}--;
3015: return $here;
3016: }
3017: }
3018:
3019: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3020: $self->{HERE} = $here;
3021:
3022: # Get to the right level
3023: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3024: push @{$self->{STACK}->[$newDepth]}, $here;
3025: $self->{CURRENT_DEPTH}--;
3026: return END_BRANCH();
3027: }
3028: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3029: push @{$self->{STACK}->[$newDepth]}, $here;
3030: $self->{CURRENT_DEPTH}++;
3031: return BEGIN_BRANCH();
3032: }
3033:
3034: # If we made it here, we have the next resource, and we're at the
3035: # right branch level. So let's examine the resource for where
3036: # we can get to from here.
3037:
3038: # So we need to look at all the resources we can get to from here,
3039: # categorize them if we haven't seen them, remember if we have a new
3040: my $nextUnfiltered = $here->getNext();
3041: my $maxDepthAdded = -1;
3042:
3043: for (@$nextUnfiltered) {
3044: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3045: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3046: push @{$self->{STACK}->[$depth]}, $_;
3047: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3048: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3049: }
3050: }
3051:
3052: # Is this the end of a branch? If so, all of the resources examined above
3053: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3054: # marker onto the stack so we don't forget.
3055: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3056: # BC branch and gets to C, it will see F as the only next resource, but it's
3057: # one level lower. Thus, this is the end of the branch, since there are no
3058: # more resources added to this level or above.
3059: # We don't do this if the examined resource is the finish resource,
3060: # because the condition given above is true, but the "END_MAP" will
3061: # take care of things and we should already be at depth 0.
3062: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3063: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3064: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3065: }
3066:
3067: # That ends the main iterator logic. Now, do we want to recurse
3068: # down this map (if this resource is a map)?
3069: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3070: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3071: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3072: my $firstResource = $self->{HERE}->map_start();
3073: my $finishResource = $self->{HERE}->map_finish();
3074:
3075: $self->{RECURSIVE_ITERATOR} =
3076: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3077: $finishResource, $self->{FILTER},
3078: $self->{ALREADY_SEEN},
3079: $self->{CONDITION},
3080: $self->{FORCE_TOP});
3081: }
3082:
3083: # If this is a blank resource, don't actually return it.
3084: # Should you ever find you need it, make sure to add an option to the code
3085: # that you can use; other things depend on this behavior.
3086: my $browsePriv = $self->{HERE}->browsePriv();
3087: if (!$self->{HERE}->src() ||
3088: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3089: return $self->next($closeAllPages);
3090: }
3091:
3092: return $self->{HERE};
3093:
3094: }
3095:
3096: =pod
3097:
3098: The other method available on the iterator is B<getStack>, which
3099: returns an array populated with the current 'stack' of maps, as
3100: references to the resource objects. Example: This is useful when
3101: making the navigation map, as we need to check whether we are under a
3102: page map to see if we need to link directly to the resource, or to the
3103: page. The first elements in the array will correspond to the top of
3104: the stack (most inclusive map).
3105:
3106: =cut
3107:
3108: sub getStack {
3109: my $self=shift;
3110:
3111: my @stack;
3112:
3113: $self->populateStack(\@stack);
3114:
3115: return \@stack;
3116: }
3117:
3118: # Private method: Calls the iterators recursively to populate the stack.
3119: sub populateStack {
3120: my $self=shift;
3121: my $stack = shift;
3122:
3123: push @$stack, $self->{HERE} if ($self->{HERE});
3124:
3125: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3126: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3127: }
3128: }
3129:
3130: 1;
3131:
3132: package Apache::lonnavmaps::DFSiterator;
3133: use WeakRef;
3134: # Not documented in the perldoc: This is a simple iterator that just walks
3135: # through the nav map and presents the resources in a depth-first search
3136: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3137: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3138: # useful for pre-processing of some kind, and is in fact used by the main
3139: # iterator that way, but that's about it.
3140: # One could imagine merging this into the init routine of the main iterator,
3141: # but this might as well be left separate, since it is possible some other
3142: # use might be found for it. - Jeremy
3143:
3144: # Unlike the main iterator, this DOES return all resources, even blank ones.
3145: # The main iterator needs them to correctly preprocess the map.
3146:
3147: sub BEGIN_MAP { return 1; } # begining of a new map
3148: sub END_MAP { return 2; } # end of the map
3149: sub FORWARD { return 1; } # go forward
3150: sub BACKWARD { return 2; }
3151:
3152: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3153: # filter hash ref (or undef), already seen hash or undef, condition
3154: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3155: sub new {
3156: # magic invocation to create a class instance
3157: my $proto = shift;
3158: my $class = ref($proto) || $proto;
3159: my $self = {};
3160:
3161: weaken($self->{NAV_MAP} = shift);
3162: return undef unless ($self->{NAV_MAP});
3163:
3164: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3165: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3166:
3167: # If the given resources are just the ID of the resource, get the
3168: # objects
3169: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3170: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3171: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3172: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3173:
3174: $self->{FILTER} = shift;
3175:
3176: # A hash, used as a set, of resource already seen
3177: $self->{ALREADY_SEEN} = shift;
3178: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3179: $self->{CONDITION} = shift;
3180: $self->{DIRECTION} = shift || FORWARD();
3181:
3182: # Flag: Have we started yet?
3183: $self->{STARTED} = 0;
3184:
3185: # Should we continue calling the recursive iterator, if any?
3186: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3187: # The recursive iterator, if any
3188: $self->{RECURSIVE_ITERATOR} = undef;
3189: # Are we recursing on a map, or a branch?
3190: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3191: # And the count of how deep it is, so that this iterator can keep track of
3192: # when to pick back up again.
3193: $self->{RECURSIVE_DEPTH} = 0;
3194:
3195: # For keeping track of our branches, we maintain our own stack
3196: $self->{STACK} = [];
3197:
3198: # Start with the first resource
3199: if ($self->{DIRECTION} == FORWARD) {
3200: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3201: } else {
3202: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3203: }
3204:
3205: bless($self);
3206: return $self;
3207: }
3208:
3209: sub next {
3210: my $self = shift;
3211:
3212: # Are we using a recursive iterator? If so, pull from that and
3213: # watch the depth; we want to resume our level at the correct time.
3214: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3215: # grab the next from the recursive iterator
3216: my $next = $self->{RECURSIVE_ITERATOR}->next();
3217:
3218: # is it a begin or end map? Update depth if so
3219: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3220: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3221:
3222: # Are we back at depth 0? If so, stop recursing.
3223: if ($self->{RECURSIVE_DEPTH} == 0) {
3224: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3225: }
3226:
3227: return $next;
3228: }
3229:
3230: # Is there a current resource to grab? If not, then return
3231: # END_MAP, which will end the iterator.
3232: if (scalar(@{$self->{STACK}}) == 0) {
3233: return $self->END_MAP();
3234: }
3235:
3236: # Have we not yet begun? If not, return BEGIN_MAP and
3237: # remember that we've started.
3238: if ( !$self->{STARTED} ) {
3239: $self->{STARTED} = 1;
3240: return $self->BEGIN_MAP;
3241: }
3242:
3243: # Get the next resource in the branch
3244: $self->{HERE} = pop @{$self->{STACK}};
3245:
3246: # remember that we've seen this, so we don't return it again later
3247: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3248:
3249: # Get the next possible resources
3250: my $nextUnfiltered;
3251: if ($self->{DIRECTION} == FORWARD()) {
3252: $nextUnfiltered = $self->{HERE}->getNext();
3253: } else {
3254: $nextUnfiltered = $self->{HERE}->getPrevious();
3255: }
3256: my $next = [];
3257:
3258: # filter the next possibilities to remove things we've
3259: # already seen.
3260: foreach (@$nextUnfiltered) {
3261: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3262: push @$next, $_;
3263: }
3264: }
3265:
3266: while (@$next) {
3267: # copy the next possibilities over to the stack
3268: push @{$self->{STACK}}, shift @$next;
3269: }
3270:
3271: # If this is a map and we want to recurse down it... (not filtered out)
3272: if ($self->{HERE}->is_map() &&
3273: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3274: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3275: my $firstResource = $self->{HERE}->map_start();
3276: my $finishResource = $self->{HERE}->map_finish();
3277:
3278: $self->{RECURSIVE_ITERATOR} =
3279: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3280: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3281: $self->{CONDITION}, $self->{DIRECTION});
3282: }
3283:
3284: return $self->{HERE};
3285: }
3286:
3287: # Identical to the full iterator methods of the same name. Hate to copy/paste
3288: # but I also hate to "inherit" either iterator from the other.
3289:
3290: sub getStack {
3291: my $self=shift;
3292:
3293: my @stack;
3294:
3295: $self->populateStack(\@stack);
3296:
3297: return \@stack;
3298: }
3299:
3300: # Private method: Calls the iterators recursively to populate the stack.
3301: sub populateStack {
3302: my $self=shift;
3303: my $stack = shift;
3304:
3305: push @$stack, $self->{HERE} if ($self->{HERE});
3306:
3307: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3308: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3309: }
3310: }
3311:
3312: 1;
3313:
3314: package Apache::lonnavmaps::resource;
3315: use WeakRef;
3316: use Apache::lonnet;
3317:
3318: =pod
3319:
3320: =head1 Object: resource
3321:
3322: X<resource, navmap object>
3323: A resource object encapsulates a resource in a resource map, allowing
3324: easy manipulation of the resource, querying the properties of the
3325: resource (including user properties), and represents a reference that
3326: can be used as the canonical representation of the resource by
3327: lonnavmap clients like renderers.
3328:
3329: A resource only makes sense in the context of a navmap, as some of the
3330: data is stored in the navmap object.
3331:
3332: You will probably never need to instantiate this object directly. Use
3333: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3334: starting resource.
3335:
3336: Resource objects respect the parameter_hiddenparts, which suppresses
3337: various parts according to the wishes of the map author. As of this
3338: writing, there is no way to override this parameter, and suppressed
3339: parts will never be returned, nor will their response types or ids be
3340: stored.
3341:
3342: =head2 Overview
3343:
3344: A B<Resource> is the most granular type of object in LON-CAPA that can
3345: be included in a course. It can either be a particular resource, like
3346: an HTML page, external resource, problem, etc., or it can be a
3347: container sequence, such as a "page" or a "map".
3348:
3349: To see a sequence from the user's point of view, please see the
3350: B<Creating a Course: Maps and Sequences> chapter of the Author's
3351: Manual.
3352:
3353: A Resource Object, once obtained from a navmap object via a B<getBy*>
3354: method of the navmap, or from an iterator, allows you to query
3355: information about that resource.
3356:
3357: Generally, you do not ever want to create a resource object yourself,
3358: so creation has been left undocumented. Always retrieve resources
3359: from navmap objects.
3360:
3361: =head3 Identifying Resources
3362:
3363: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3364: unique to that resource for a given course. X<resource ID, in big hash>
3365: The Resource ID has the form #.#, where the first number is the same
3366: for every resource in a map, and the second is unique. For instance,
3367: for a course laid out like this:
3368:
3369: * Problem 1
3370: * Map
3371: * Resource 2
3372: * Resource 3
3373:
3374: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3375: C<Resource 3> will share a first number. The second number may end up
3376: re-used between the two groups.
3377:
3378: The resource ID is only used in the big hash, but can be used in the
3379: context of a course to identify a resource easily. (For instance, the
3380: printing system uses it to record which resources from a sequence you
3381: wish to print.)
3382:
3383: X<symb> X<resource, symb>
3384: All resources also have B<symb>s, which uniquely identify a resource
3385: in a course. Many internal LON-CAPA functions expect a symb. A symb
3386: carries along with it the URL of the resource, and the map it appears
3387: in. Symbs are much larger then resource IDs.
3388:
3389: =cut
3390:
3391: sub new {
3392: # magic invocation to create a class instance
3393: my $proto = shift;
3394: my $class = ref($proto) || $proto;
3395: my $self = {};
3396:
3397: weaken($self->{NAV_MAP} = shift);
3398: $self->{ID} = shift;
3399:
3400: # Store this new resource in the parent nav map's cache.
3401: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3402: $self->{RESOURCE_ERROR} = 0;
3403:
3404: # A hash that can be used by two-pass algorithms to store data
3405: # about this resource in. Not used by the resource object
3406: # directly.
3407: $self->{DATA} = {};
3408:
3409: bless($self);
3410:
3411: return $self;
3412: }
3413:
3414: # private function: simplify the NAV_HASH lookups we keep doing
3415: # pass the name, and to automatically append my ID, pass a true val on the
3416: # second param
3417: sub navHash {
3418: my $self = shift;
3419: my $param = shift;
3420: my $id = shift;
3421: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3422: }
3423:
3424: =pod
3425:
3426: =head2 Methods
3427:
3428: Once you have a resource object, here's what you can do with it:
3429:
3430: =head3 Attribute Retrieval
3431:
3432: Every resource has certain attributes that can be retrieved and used:
3433:
3434: =over 4
3435:
3436: =item * B<ID>: Every resource has an ID that is unique for that
3437: resource in the course it is in. The ID is actually in the hash
3438: representing the resource, so for a resource object $res, obtain
3439: it via C<$res->{ID}).
3440:
3441: =item * B<compTitle>:
3442:
3443: Returns a "composite title", that is equal to $res->title() if the
3444: resource has a title, and is otherwise the last part of the URL (e.g.,
3445: "problem.problem").
3446:
3447: =item * B<ext>:
3448:
3449: Returns true if the resource is external.
3450:
3451: =item * B<kind>:
3452:
3453: Returns the kind of the resource from the compiled nav map.
3454:
3455: =item * B<randomout>:
3456:
3457: Returns true if this resource was chosen to NOT be shown to the user
3458: by the random map selection feature. In other words, this is usually
3459: false.
3460:
3461: =item * B<randompick>:
3462:
3463: Returns true for a map if the randompick feature is being used on the
3464: map. (?)
3465:
3466: =item * B<src>:
3467:
3468: Returns the source for the resource.
3469:
3470: =item * B<symb>:
3471:
3472: Returns the symb for the resource.
3473:
3474: =item * B<title>:
3475:
3476: Returns the title of the resource.
3477:
3478: =back
3479:
3480: =cut
3481:
3482: # These info functions can be used directly, as they don't return
3483: # resource information.
3484: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3485: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3486: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3487: sub from { my $self=shift; return $self->navHash("from_", 1); }
3488: # considered private and undocumented
3489: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3490: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3491: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3492: sub randompick {
3493: my $self = shift;
3494: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3495: '.0.parameter_randompick'};
3496: }
3497: sub link {
3498: my $self=shift;
3499: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3500: return $self->src;
3501: }
3502: sub src {
3503: my $self=shift;
3504: return $self->navHash("src_", 1);
3505: }
3506: sub shown_symb {
3507: my $self=shift;
3508: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3509: return $self->symb();
3510: }
3511: sub symb {
3512: my $self=shift;
3513: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3514: my $symbSrc = &Apache::lonnet::declutter($self->src());
3515: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3516: . '___' . $second . '___' . $symbSrc;
3517: return &Apache::lonnet::symbclean($symb);
3518: }
3519: sub title {
3520: my $self=shift;
3521: if ($self->{ID} eq '0.0') {
3522: # If this is the top-level map, return the title of the course
3523: # since this map can not be titled otherwise.
3524: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3525: }
3526: return $self->navHash("title_", 1); }
3527: # considered private and undocumented
3528: sub to { my $self=shift; return $self->navHash("to_", 1); }
3529: sub condition {
3530: my $self=shift;
3531: my $undercond=$self->navHash("undercond_", 1);
3532: if (!defined($undercond)) { return 1; };
3533: my $condid=$self->navHash("condid_$undercond");
3534: if (!defined($condid)) { return 1; };
3535: my $condition=&Apache::lonnet::directcondval($condid);
3536: return $condition;
3537: }
3538:
3539: sub compTitle {
3540: my $self = shift;
3541: my $title = $self->title();
3542: $title=~s/\&colon\;/\:/gs;
3543: if (!$title) {
3544: $title = $self->src();
3545: $title = substr($title, rindex($title, '/') + 1);
3546: }
3547: return $title;
3548: }
3549: =pod
3550:
3551: B<Predicate Testing the Resource>
3552:
3553: These methods are shortcuts to deciding if a given resource has a given property.
3554:
3555: =over 4
3556:
3557: =item * B<is_map>:
3558:
3559: Returns true if the resource is a map type.
3560:
3561: =item * B<is_problem>:
3562:
3563: Returns true if the resource is a problem type, false
3564: otherwise. (Looks at the extension on the src field; might need more
3565: to work correctly.)
3566:
3567: =item * B<is_page>:
3568:
3569: Returns true if the resource is a page.
3570:
3571: =item * B<is_sequence>:
3572:
3573: Returns true if the resource is a sequence.
3574:
3575: =back
3576:
3577: =cut
3578:
3579: sub hasResource {
3580: my $self = shift;
3581: return $self->{NAV_MAP}->hasResource(@_);
3582: }
3583:
3584: sub retrieveResources {
3585: my $self = shift;
3586: return $self->{NAV_MAP}->retrieveResources(@_);
3587: }
3588:
3589: sub is_html {
3590: my $self=shift;
3591: my $src = $self->src();
3592: return ($src =~ /html$/);
3593: }
3594: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3595: sub is_page {
3596: my $self=shift;
3597: my $src = $self->src();
3598: return $self->navHash("is_map_", 1) &&
3599: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3600: }
3601: sub is_problem {
3602: my $self=shift;
3603: my $src = $self->src();
3604: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3605: }
3606: sub contains_problem {
3607: my $self=shift;
3608: if ($self->is_page()) {
3609: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3610: return $hasProblem;
3611: }
3612: return 0;
3613: }
3614: sub is_sequence {
3615: my $self=shift;
3616: my $src = $self->src();
3617: return $self->navHash("is_map_", 1) &&
3618: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3619: }
3620: sub is_survey {
3621: my $self = shift();
3622: my $part = shift();
3623: if ($self->parmval('type',$part) eq 'survey') {
3624: return 1;
3625: }
3626: if ($self->src() =~ /\.(survey)$/) {
3627: return 1;
3628: }
3629: return 0;
3630: }
3631:
3632: sub is_empty_sequence {
3633: my $self=shift;
3634: my $src = $self->src();
3635: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3636: }
3637:
3638: # Private method: Shells out to the parmval in the nav map, handler parts.
3639: sub parmval {
3640: my $self = shift;
3641: my $what = shift;
3642: my $part = shift;
3643: if (!defined($part)) {
3644: $part = '0';
3645: }
3646: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3647: }
3648:
3649: =pod
3650:
3651: B<Map Methods>
3652:
3653: These methods are useful for getting information about the map
3654: properties of the resource, if the resource is a map (B<is_map>).
3655:
3656: =over 4
3657:
3658: =item * B<map_finish>:
3659:
3660: Returns a reference to a resource object corresponding to the finish
3661: resource of the map.
3662:
3663: =item * B<map_pc>:
3664:
3665: Returns the pc value of the map, which is the first number that
3666: appears in the resource ID of the resources in the map, and is the
3667: number that appears around the middle of the symbs of the resources in
3668: that map.
3669:
3670: =item * B<map_start>:
3671:
3672: Returns a reference to a resource object corresponding to the start
3673: resource of the map.
3674:
3675: =item * B<map_type>:
3676:
3677: Returns a string with the type of the map in it.
3678:
3679: =back
3680:
3681: =cut
3682:
3683: sub map_finish {
3684: my $self = shift;
3685: my $src = $self->src();
3686: $src = Apache::lonnet::clutter($src);
3687: my $res = $self->navHash("map_finish_$src", 0);
3688: $res = $self->{NAV_MAP}->getById($res);
3689: return $res;
3690: }
3691: sub map_pc {
3692: my $self = shift;
3693: my $src = $self->src();
3694: return $self->navHash("map_pc_$src", 0);
3695: }
3696: sub map_start {
3697: my $self = shift;
3698: my $src = $self->src();
3699: $src = Apache::lonnet::clutter($src);
3700: my $res = $self->navHash("map_start_$src", 0);
3701: $res = $self->{NAV_MAP}->getById($res);
3702: return $res;
3703: }
3704: sub map_type {
3705: my $self = shift;
3706: my $pc = $self->map_pc();
3707: return $self->navHash("map_type_$pc", 0);
3708: }
3709:
3710: #####
3711: # Property queries
3712: #####
3713:
3714: # These functions will be responsible for returning the CORRECT
3715: # VALUE for the parameter, no matter what. So while they may look
3716: # like direct calls to parmval, they can be more then that.
3717: # So, for instance, the duedate function should use the "duedatetype"
3718: # information, rather then the resource object user.
3719:
3720: =pod
3721:
3722: =head2 Resource Parameters
3723:
3724: In order to use the resource parameters correctly, the nav map must
3725: have been instantiated with genCourseAndUserOptions set to true, so
3726: the courseopt and useropt is read correctly. Then, you can call these
3727: functions to get the relevant parameters for the resource. Each
3728: function defaults to part "0", but can be directed to another part by
3729: passing the part as the parameter.
3730:
3731: These methods are responsible for getting the parameter correct, not
3732: merely reflecting the contents of the GDBM hashes. As we move towards
3733: dates relative to other dates, these methods should be updated to
3734: reflect that. (Then, anybody using these methods will not have to update
3735: their code.)
3736:
3737: =over 4
3738:
3739: =item * B<acc>:
3740:
3741: Get the Client IP/Name Access Control information.
3742:
3743: =item * B<answerdate>:
3744:
3745: Get the answer-reveal date for the problem.
3746:
3747: =item * B<awarded>:
3748:
3749: Gets the awarded value for the problem part. Requires genUserData set to
3750: true when the navmap object was created.
3751:
3752: =item * B<duedate>:
3753:
3754: Get the due date for the problem.
3755:
3756: =item * B<tries>:
3757:
3758: Get the number of tries the student has used on the problem.
3759:
3760: =item * B<maxtries>:
3761:
3762: Get the number of max tries allowed.
3763:
3764: =item * B<opendate>:
3765:
3766: Get the open date for the problem.
3767:
3768: =item * B<sig>:
3769:
3770: Get the significant figures setting.
3771:
3772: =item * B<tol>:
3773:
3774: Get the tolerance for the problem.
3775:
3776: =item * B<tries>:
3777:
3778: Get the number of tries the user has already used on the problem.
3779:
3780: =item * B<type>:
3781:
3782: Get the question type for the problem.
3783:
3784: =item * B<weight>:
3785:
3786: Get the weight for the problem.
3787:
3788: =back
3789:
3790: =cut
3791:
3792: sub acc {
3793: (my $self, my $part) = @_;
3794: return $self->parmval("acc", $part);
3795: }
3796: sub answerdate {
3797: (my $self, my $part) = @_;
3798: # Handle intervals
3799: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3800: return $self->duedate($part) +
3801: $self->parmval("answerdate", $part);
3802: }
3803: return $self->parmval("answerdate", $part);
3804: }
3805: sub awarded {
3806: my $self = shift; my $part = shift;
3807: $self->{NAV_MAP}->get_user_data();
3808: if (!defined($part)) { $part = '0'; }
3809: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3810: }
3811: sub duedate {
3812: (my $self, my $part) = @_;
3813: my $interval=$self->parmval("interval", $part);
3814: if ($interval) {
3815: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3816: if ($first_access) { return ($first_access+$interval); }
3817: }
3818: return $self->parmval("duedate", $part);
3819: }
3820: sub maxtries {
3821: (my $self, my $part) = @_;
3822: return $self->parmval("maxtries", $part);
3823: }
3824: sub opendate {
3825: (my $self, my $part) = @_;
3826: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3827: return $self->duedate($part) -
3828: $self->parmval("opendate", $part);
3829: }
3830: return $self->parmval("opendate");
3831: }
3832: sub problemstatus {
3833: (my $self, my $part) = @_;
3834: return lc $self->parmval("problemstatus", $part);
3835: }
3836: sub sig {
3837: (my $self, my $part) = @_;
3838: return $self->parmval("sig", $part);
3839: }
3840: sub tol {
3841: (my $self, my $part) = @_;
3842: return $self->parmval("tol", $part);
3843: }
3844: sub tries {
3845: my $self = shift;
3846: my $tries = $self->queryRestoreHash('tries', shift);
3847: if (!defined($tries)) { return '0';}
3848: return $tries;
3849: }
3850: sub type {
3851: (my $self, my $part) = @_;
3852: return $self->parmval("type", $part);
3853: }
3854: sub weight {
3855: my $self = shift; my $part = shift;
3856: if (!defined($part)) { $part = '0'; }
3857: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3858: $self->symb(), $ENV{'user.domain'},
3859: $ENV{'user.name'},
3860: $ENV{'request.course.sec'});
3861: }
3862: sub part_display {
3863: my $self= shift(); my $partID = shift();
3864: if (! defined($partID)) { $partID = '0'; }
3865: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3866: $self->symb);
3867: if (! defined($display) || $display eq '') {
3868: $display = $partID;
3869: }
3870: return $display;
3871: }
3872:
3873: # Multiple things need this
3874: sub getReturnHash {
3875: my $self = shift;
3876:
3877: if (!defined($self->{RETURN_HASH})) {
3878: my %tmpHash = &Apache::lonnet::restore($self->symb());
3879: $self->{RETURN_HASH} = \%tmpHash;
3880: }
3881: }
3882:
3883: ######
3884: # Status queries
3885: ######
3886:
3887: # These methods query the status of problems.
3888:
3889: # If we need to count parts, this function determines the number of
3890: # parts from the metadata. When called, it returns a reference to a list
3891: # of strings corresponding to the parts. (Thus, using it in a scalar context
3892: # tells you how many parts you have in the problem:
3893: # $partcount = scalar($resource->countParts());
3894: # Don't use $self->{PARTS} directly because you don't know if it's been
3895: # computed yet.
3896:
3897: =pod
3898:
3899: =head2 Resource misc
3900:
3901: Misc. functions for the resource.
3902:
3903: =over 4
3904:
3905: =item * B<hasDiscussion>:
3906:
3907: Returns a false value if there has been discussion since the user last
3908: logged in, true if there has. Always returns false if the discussion
3909: data was not extracted when the nav map was constructed.
3910:
3911: =item * B<getFeedback>:
3912:
3913: Gets the feedback for the resource and returns the raw feedback string
3914: for the resource, or the null string if there is no feedback or the
3915: email data was not extracted when the nav map was constructed. Usually
3916: used like this:
3917:
3918: for (split(/\,/, $res->getFeedback())) {
3919: my $link = &Apache::lonnet::escape($_);
3920: ...
3921:
3922: and use the link as appropriate.
3923:
3924: =cut
3925:
3926: sub hasDiscussion {
3927: my $self = shift;
3928: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3929: }
3930:
3931: sub getFeedback {
3932: my $self = shift;
3933: my $source = $self->src();
3934: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3935: return $self->{NAV_MAP}->getFeedback($source);
3936: }
3937:
3938: sub getErrors {
3939: my $self = shift;
3940: my $source = $self->src();
3941: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3942: return $self->{NAV_MAP}->getErrors($source);
3943: }
3944:
3945: =pod
3946:
3947: =item * B<parts>():
3948:
3949: Returns a list reference containing sorted strings corresponding to
3950: each part of the problem. Single part problems have only a part '0'.
3951: Multipart problems do not return their part '0', since they typically
3952: do not really matter.
3953:
3954: =item * B<countParts>():
3955:
3956: Returns the number of parts of the problem a student can answer. Thus,
3957: for single part problems, returns 1. For multipart, it returns the
3958: number of parts in the problem, not including psuedo-part 0.
3959:
3960: =item * B<countResponses>():
3961:
3962: Returns the total number of responses in the problem a student can answer.
3963:
3964: =item * B<responseTypes>():
3965:
3966: Returns a hash whose keys are the response types. The values are the number
3967: of times each response type is used. This is for the I<entire> problem, not
3968: just a single part.
3969:
3970: =item * B<multipart>():
3971:
3972: Returns true if the problem is multipart, false otherwise. Use this instead
3973: of countParts if all you want is multipart/not multipart.
3974:
3975: =item * B<responseType>($part):
3976:
3977: Returns the response type of the part, without the word "response" on the
3978: end. Example return values: 'string', 'essay', 'numeric', etc.
3979:
3980: =item * B<responseIds>($part):
3981:
3982: Retreives the response IDs for the given part as an array reference containing
3983: strings naming the response IDs. This may be empty.
3984:
3985: =back
3986:
3987: =cut
3988:
3989: sub parts {
3990: my $self = shift;
3991:
3992: if ($self->ext) { return []; }
3993:
3994: $self->extractParts();
3995: return $self->{PARTS};
3996: }
3997:
3998: sub countParts {
3999: my $self = shift;
4000:
4001: my $parts = $self->parts();
4002:
4003: # If I left this here, then it's not necessary.
4004: #my $delta = 0;
4005: #for my $part (@$parts) {
4006: # if ($part eq '0') { $delta--; }
4007: #}
4008:
4009: if ($self->{RESOURCE_ERROR}) {
4010: return 0;
4011: }
4012:
4013: return scalar(@{$parts}); # + $delta;
4014: }
4015:
4016: sub countResponses {
4017: my $self = shift;
4018: my $count;
4019: foreach my $part (@{$self->parts()}) {
4020: $count+= scalar($self->responseIds($part));
4021: }
4022: return $count;
4023: }
4024:
4025: sub responseTypes {
4026: my $self = shift;
4027: my %responses;
4028: foreach my $part ($self->parts()) {
4029: foreach my $responsetype ($self->responseType($part)) {
4030: $responses{$responsetype}++ if (defined($responsetype));
4031: }
4032: }
4033: return %responses;
4034: }
4035:
4036: sub multipart {
4037: my $self = shift;
4038: return $self->countParts() > 1;
4039: }
4040:
4041: sub singlepart {
4042: my $self = shift;
4043: return $self->countParts() == 1;
4044: }
4045:
4046: sub responseType {
4047: my $self = shift;
4048: my $part = shift;
4049:
4050: $self->extractParts();
4051: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4052: return @{$self->{RESPONSE_TYPES}->{$part}};
4053: } else {
4054: return undef;
4055: }
4056: }
4057:
4058: sub responseIds {
4059: my $self = shift;
4060: my $part = shift;
4061:
4062: $self->extractParts();
4063: if (defined($self->{RESPONSE_IDS}->{$part})) {
4064: return @{$self->{RESPONSE_IDS}->{$part}};
4065: } else {
4066: return undef;
4067: }
4068: }
4069:
4070: # Private function: Extracts the parts information, both part names and
4071: # part types, and saves it.
4072: sub extractParts {
4073: my $self = shift;
4074:
4075: return if (defined($self->{PARTS}));
4076: return if ($self->ext);
4077:
4078: $self->{PARTS} = [];
4079:
4080: my %parts;
4081:
4082: # Retrieve part count, if this is a problem
4083: if ($self->is_problem()) {
4084: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4085: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4086:
4087: if ($partorder) {
4088: my @parts;
4089: for my $part (split (/,/,$partorder)) {
4090: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4091: push @parts, $part;
4092: $parts{$part} = 1;
4093: }
4094: }
4095: $self->{PARTS} = \@parts;
4096: } else {
4097: if (!$metadata) {
4098: $self->{RESOURCE_ERROR} = 1;
4099: $self->{PARTS} = [];
4100: $self->{PART_TYPE} = {};
4101: return;
4102: }
4103: foreach (split(/\,/,$metadata)) {
4104: if ($_ =~ /^part_(.*)$/) {
4105: my $part = $1;
4106: # This floods the logs if it blows up
4107: if (defined($parts{$part})) {
4108: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4109: }
4110:
4111: # check to see if part is turned off.
4112:
4113: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4114: $parts{$part} = 1;
4115: }
4116: }
4117: }
4118: my @sortedParts = sort keys %parts;
4119: $self->{PARTS} = \@sortedParts;
4120: }
4121:
4122:
4123: # These hashes probably do not need names that end with "Hash"....
4124: my %responseIdHash;
4125: my %responseTypeHash;
4126:
4127:
4128: # Init the responseIdHash
4129: foreach (@{$self->{PARTS}}) {
4130: $responseIdHash{$_} = [];
4131: }
4132:
4133: # Now, the unfortunate thing about this is that parts, part name, and
4134: # response id are delimited by underscores, but both the part
4135: # name and response id can themselves have underscores in them.
4136: # So we have to use our knowlege of part names to figure out
4137: # where the part names begin and end, and even then, it is possible
4138: # to construct ambiguous situations.
4139: foreach (split /,/, $metadata) {
4140: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4141: my $responseType = $1;
4142: my $partStuff = $2;
4143: my $partIdSoFar = '';
4144: my @partChunks = split /_/, $partStuff;
4145: my $i = 0;
4146: for ($i = 0; $i < scalar(@partChunks); $i++) {
4147: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4148: $partIdSoFar .= $partChunks[$i];
4149: if ($parts{$partIdSoFar}) {
4150: my @otherChunks = @partChunks[$i+1..$#partChunks];
4151: my $responseId = join('_', @otherChunks);
4152: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4153: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4154: }
4155: }
4156: }
4157: }
4158: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4159: #
4160: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4161: if ($resorder) {
4162: my @resorder=split(/,/,$resorder);
4163: foreach my $part (keys(%responseIdHash)) {
4164: my $i=0;
4165: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4166: my @neworder;
4167: foreach my $possibleid (@resorder) {
4168: if (exists($resids{$possibleid})) {
4169: push(@neworder,$resids{$possibleid});
4170: }
4171: }
4172: my @ids;
4173: my @type;
4174: foreach my $element (@neworder) {
4175: push (@ids,$responseIdHash{$part}->[$element]);
4176: push (@type,$responseTypeHash{$part}->[$element]);
4177: }
4178: $responseIdHash{$part}=\@ids;
4179: $responseTypeHash{$part}=\@type;
4180: }
4181: }
4182: $self->{RESPONSE_IDS} = \%responseIdHash;
4183: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4184: }
4185:
4186: return;
4187: }
4188:
4189: =pod
4190:
4191: =head2 Resource Status
4192:
4193: Problem resources have status information, reflecting their various
4194: dates and completion statuses.
4195:
4196: There are two aspects to the status: the date-related information and
4197: the completion information.
4198:
4199: Idiomatic usage of these two methods would probably look something
4200: like
4201:
4202: foreach ($resource->parts()) {
4203: my $dateStatus = $resource->getDateStatus($_);
4204: my $completionStatus = $resource->getCompletionStatus($_);
4205:
4206: or
4207:
4208: my $status = $resource->status($_);
4209:
4210: ... use it here ...
4211: }
4212:
4213: Which you use depends on exactly what you are looking for. The
4214: status() function has been optimized for the nav maps display and may
4215: not precisely match what you need elsewhere.
4216:
4217: The symbolic constants shown below can be accessed through the
4218: resource object: C<$res->OPEN>.
4219:
4220: =over 4
4221:
4222: =item * B<getDateStatus>($part):
4223:
4224: ($part defaults to 0). A convenience function that returns a symbolic
4225: constant telling you about the date status of the part. The possible
4226: return values are:
4227:
4228: =back
4229:
4230: B<Date Codes>
4231:
4232: =over 4
4233:
4234: =item * B<OPEN_LATER>:
4235:
4236: The problem will be opened later.
4237:
4238: =item * B<OPEN>:
4239:
4240: Open and not yet due.
4241:
4242:
4243: =item * B<PAST_DUE_ANSWER_LATER>:
4244:
4245: The due date has passed, but the answer date has not yet arrived.
4246:
4247: =item * B<PAST_DUE_NO_ANSWER>:
4248:
4249: The due date has passed and there is no answer opening date set.
4250:
4251: =item * B<ANSWER_OPEN>:
4252:
4253: The answer date is here.
4254:
4255: =item * B<NETWORK_FAILURE>:
4256:
4257: The information is unknown due to network failure.
4258:
4259: =back
4260:
4261: =cut
4262:
4263: # Apparently the compiler optimizes these into constants automatically
4264: sub OPEN_LATER { return 0; }
4265: sub OPEN { return 1; }
4266: sub PAST_DUE_NO_ANSWER { return 2; }
4267: sub PAST_DUE_ANSWER_LATER { return 3; }
4268: sub ANSWER_OPEN { return 4; }
4269: sub NOTHING_SET { return 5; }
4270: sub NETWORK_FAILURE { return 100; }
4271:
4272: # getDateStatus gets the date status for a given problem part.
4273: # Because answer date, due date, and open date are fully independent
4274: # (i.e., it is perfectly possible to *only* have an answer date),
4275: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4276: # (past, future, none given). This function handles this with a decision
4277: # tree. Read the comments to follow the decision tree.
4278:
4279: sub getDateStatus {
4280: my $self = shift;
4281: my $part = shift;
4282: $part = "0" if (!defined($part));
4283:
4284: # Always return network failure if there was one.
4285: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4286:
4287: my $now = time();
4288:
4289: my $open = $self->opendate($part);
4290: my $due = $self->duedate($part);
4291: my $answer = $self->answerdate($part);
4292:
4293: if (!$open && !$due && !$answer) {
4294: # no data on the problem at all
4295: # should this be the same as "open later"? think multipart.
4296: return $self->NOTHING_SET;
4297: }
4298: if (!$open || $now < $open) {return $self->OPEN_LATER}
4299: if (!$due || $now < $due) {return $self->OPEN}
4300: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4301: if ($answer) { return $self->ANSWER_OPEN; }
4302: return PAST_DUE_NO_ANSWER;
4303: }
4304:
4305: =pod
4306:
4307: B<>
4308:
4309: =over 4
4310:
4311: =item * B<getCompletionStatus>($part):
4312:
4313: ($part defaults to 0.) A convenience function that returns a symbolic
4314: constant telling you about the completion status of the part, with the
4315: following possible results:
4316:
4317: =back
4318:
4319: B<Completion Codes>
4320:
4321: =over 4
4322:
4323: =item * B<NOT_ATTEMPTED>:
4324:
4325: Has not been attempted at all.
4326:
4327: =item * B<INCORRECT>:
4328:
4329: Attempted, but wrong by student.
4330:
4331: =item * B<INCORRECT_BY_OVERRIDE>:
4332:
4333: Attempted, but wrong by instructor override.
4334:
4335: =item * B<CORRECT>:
4336:
4337: Correct or correct by instructor.
4338:
4339: =item * B<CORRECT_BY_OVERRIDE>:
4340:
4341: Correct by instructor override.
4342:
4343: =item * B<EXCUSED>:
4344:
4345: Excused. Not yet implemented.
4346:
4347: =item * B<NETWORK_FAILURE>:
4348:
4349: Information not available due to network failure.
4350:
4351: =item * B<ATTEMPTED>:
4352:
4353: Attempted, and not yet graded.
4354:
4355: =back
4356:
4357: =cut
4358:
4359: sub NOT_ATTEMPTED { return 10; }
4360: sub INCORRECT { return 11; }
4361: sub INCORRECT_BY_OVERRIDE { return 12; }
4362: sub CORRECT { return 13; }
4363: sub CORRECT_BY_OVERRIDE { return 14; }
4364: sub EXCUSED { return 15; }
4365: sub ATTEMPTED { return 16; }
4366:
4367: sub getCompletionStatus {
4368: my $self = shift;
4369: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4370:
4371: my $status = $self->queryRestoreHash('solved', shift);
4372:
4373: # Left as separate if statements in case we ever do more with this
4374: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4375: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4376: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
4377: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4378: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4379: if ($status eq 'excused') {return $self->EXCUSED; }
4380: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4381: return $self->NOT_ATTEMPTED;
4382: }
4383:
4384: sub queryRestoreHash {
4385: my $self = shift;
4386: my $hashentry = shift;
4387: my $part = shift;
4388: $part = "0" if (!defined($part) || $part eq '');
4389: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4390:
4391: $self->getReturnHash();
4392:
4393: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4394: }
4395:
4396: =pod
4397:
4398: B<Composite Status>
4399:
4400: Along with directly returning the date or completion status, the
4401: resource object includes a convenience function B<status>() that will
4402: combine the two status tidbits into one composite status that can
4403: represent the status of the resource as a whole. This method represents
4404: the concept of the thing we want to display to the user on the nav maps
4405: screen, which is a combination of completion and open status. The precise logic is
4406: documented in the comments of the status method. The following results
4407: may be returned, all available as methods on the resource object
4408: ($res->NETWORK_FAILURE): In addition to the return values that match
4409: the date or completion status, this function can return "ANSWER_SUBMITTED"
4410: if that problemstatus parameter value is set to No, suppressing the
4411: incorrect/correct feedback.
4412:
4413: =over 4
4414:
4415: =item * B<NETWORK_FAILURE>:
4416:
4417: The network has failed and the information is not available.
4418:
4419: =item * B<NOTHING_SET>:
4420:
4421: No dates have been set for this problem (part) at all. (Because only
4422: certain parts of a multi-part problem may be assigned, this can not be
4423: collapsed into "open later", as we do not know a given part will EVER
4424: be opened. For single part, this is the same as "OPEN_LATER".)
4425:
4426: =item * B<CORRECT>:
4427:
4428: For any reason at all, the part is considered correct.
4429:
4430: =item * B<EXCUSED>:
4431:
4432: For any reason at all, the problem is excused.
4433:
4434: =item * B<PAST_DUE_NO_ANSWER>:
4435:
4436: The problem is past due, not considered correct, and no answer date is
4437: set.
4438:
4439: =item * B<PAST_DUE_ANSWER_LATER>:
4440:
4441: The problem is past due, not considered correct, and an answer date in
4442: the future is set.
4443:
4444: =item * B<ANSWER_OPEN>:
4445:
4446: The problem is past due, not correct, and the answer is now available.
4447:
4448: =item * B<OPEN_LATER>:
4449:
4450: The problem is not yet open.
4451:
4452: =item * B<TRIES_LEFT>:
4453:
4454: The problem is open, has been tried, is not correct, but there are
4455: tries left.
4456:
4457: =item * B<INCORRECT>:
4458:
4459: The problem is open, and all tries have been used without getting the
4460: correct answer.
4461:
4462: =item * B<OPEN>:
4463:
4464: The item is open and not yet tried.
4465:
4466: =item * B<ATTEMPTED>:
4467:
4468: The problem has been attempted.
4469:
4470: =item * B<ANSWER_SUBMITTED>:
4471:
4472: An answer has been submitted, but the student should not see it.
4473:
4474: =back
4475:
4476: =cut
4477:
4478: sub TRIES_LEFT { return 20; }
4479: sub ANSWER_SUBMITTED { return 21; }
4480:
4481: sub status {
4482: my $self = shift;
4483: my $part = shift;
4484: if (!defined($part)) { $part = "0"; }
4485: my $completionStatus = $self->getCompletionStatus($part);
4486: my $dateStatus = $self->getDateStatus($part);
4487:
4488: # What we have is a two-dimensional matrix with 4 entries on one
4489: # dimension and 5 entries on the other, which we want to colorize,
4490: # plus network failure and "no date data at all".
4491:
4492: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4493: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4494:
4495: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4496: # If there's an answer date and we're past it, don't
4497: # suppress the feedback; student should know
4498: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4499: $suppressFeedback = 0;
4500: }
4501:
4502: # There are a few whole rows we can dispose of:
4503: if ($completionStatus == CORRECT ||
4504: $completionStatus == CORRECT_BY_OVERRIDE ) {
4505: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4506: }
4507:
4508: if ($completionStatus == ATTEMPTED) {
4509: return ATTEMPTED;
4510: }
4511:
4512: # If it's EXCUSED, then return that no matter what
4513: if ($completionStatus == EXCUSED) {
4514: return EXCUSED;
4515: }
4516:
4517: if ($dateStatus == NOTHING_SET) {
4518: return NOTHING_SET;
4519: }
4520:
4521: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4522: # by 4 matrix (date statuses).
4523:
4524: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4525: $dateStatus == PAST_DUE_NO_ANSWER ) {
4526: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4527: }
4528:
4529: if ($dateStatus == ANSWER_OPEN) {
4530: return ANSWER_OPEN;
4531: }
4532:
4533: # Now: (incorrect, incorrect_override, not_attempted) x
4534: # (open_later), (open)
4535:
4536: if ($dateStatus == OPEN_LATER) {
4537: return OPEN_LATER;
4538: }
4539:
4540: # If it's WRONG...
4541: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4542: # and there are TRIES LEFT:
4543: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4544: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4545: }
4546: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4547: }
4548:
4549: # Otherwise, it's untried and open
4550: return OPEN;
4551: }
4552:
4553: sub CLOSED { return 23; }
4554: sub ERROR { return 24; }
4555:
4556: =pod
4557:
4558: B<Simple Status>
4559:
4560: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4561: "Simple status" corresponds to "which icon is shown on the
4562: Navmaps". There are six "simple" statuses:
4563:
4564: =over 4
4565:
4566: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4567:
4568: =item * B<OPEN>: The problem is open and unattempted.
4569:
4570: =item * B<CORRECT>: The problem is correct for any reason.
4571:
4572: =item * B<INCORRECT>: The problem is incorrect and can still be
4573: completed successfully.
4574:
4575: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4576: does not know if they are correct. (The ellipsis icon.)
4577:
4578: =item * B<ERROR>: There is an error retrieving information about this
4579: problem.
4580:
4581: =back
4582:
4583: =cut
4584:
4585: # This hash maps the composite status to this simple status, and
4586: # can be used directly, if you like
4587: my %compositeToSimple =
4588: (
4589: NETWORK_FAILURE() => ERROR,
4590: NOTHING_SET() => CLOSED,
4591: CORRECT() => CORRECT,
4592: EXCUSED() => CORRECT,
4593: PAST_DUE_NO_ANSWER() => INCORRECT,
4594: PAST_DUE_ANSWER_LATER() => INCORRECT,
4595: ANSWER_OPEN() => INCORRECT,
4596: OPEN_LATER() => CLOSED,
4597: TRIES_LEFT() => OPEN,
4598: INCORRECT() => INCORRECT,
4599: OPEN() => OPEN,
4600: ATTEMPTED() => ATTEMPTED,
4601: ANSWER_SUBMITTED() => ATTEMPTED
4602: );
4603:
4604: sub simpleStatus {
4605: my $self = shift;
4606: my $part = shift;
4607: my $status = $self->status($part);
4608: return $compositeToSimple{$status};
4609: }
4610:
4611: =pod
4612:
4613: B<simpleStatusCount> will return an array reference containing, in
4614: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4615: and ERROR parts the given problem has.
4616:
4617: =cut
4618:
4619: # This maps the status to the slot we want to increment
4620: my %statusToSlotMap =
4621: (
4622: OPEN() => 0,
4623: CLOSED() => 1,
4624: CORRECT() => 2,
4625: INCORRECT() => 3,
4626: ATTEMPTED() => 4,
4627: ERROR() => 5
4628: );
4629:
4630: sub statusToSlot { return $statusToSlotMap{shift()}; }
4631:
4632: sub simpleStatusCount {
4633: my $self = shift;
4634:
4635: my @counts = (0, 0, 0, 0, 0, 0, 0);
4636: foreach my $part (@{$self->parts()}) {
4637: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4638: }
4639:
4640: return \@counts;
4641: }
4642:
4643: =pod
4644:
4645: B<Completable>
4646:
4647: The completable method represents the concept of I<whether the student can
4648: currently do the problem>. If the student can do the problem, which means
4649: that it is open, there are tries left, and if the problem is manually graded
4650: or the grade is suppressed via problemstatus, the student has not tried it
4651: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4652: either the student has tried it and there is no feedback, or that for
4653: some reason it is no longer completable (not open yet, successfully completed,
4654: out of tries, etc.). As an example, this is used as the filter for the
4655: "Uncompleted Homework" option for the nav maps.
4656:
4657: If this does not quite meet your needs, do not fiddle with it (unless you are
4658: fixing it to better match the student's conception of "completable" because
4659: it's broken somehow)... make a new method.
4660:
4661: =cut
4662:
4663: sub completable {
4664: my $self = shift;
4665: if (!$self->is_problem()) { return 0; }
4666: my $partCount = $self->countParts();
4667:
4668: foreach my $part (@{$self->parts()}) {
4669: if ($part eq '0' && $partCount != 1) { next; }
4670: my $status = $self->status($part);
4671: # "If any of the parts are open, or have tries left (implies open),
4672: # and it is not "attempted" (manually graded problem), it is
4673: # not "complete"
4674: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4675: $status == ANSWER_SUBMITTED() ) {
4676: # did this part already, as well as we can
4677: next;
4678: }
4679: if ($status == OPEN() || $status == TRIES_LEFT()) {
4680: return 1;
4681: }
4682: }
4683:
4684: # If all the parts were complete, so was this problem.
4685: return 0;
4686: }
4687:
4688: =pod
4689:
4690: =head2 Resource/Nav Map Navigation
4691:
4692: =over 4
4693:
4694: =item * B<getNext>():
4695:
4696: Retreive an array of the possible next resources after this
4697: one. Always returns an array, even in the one- or zero-element case.
4698:
4699: =item * B<getPrevious>():
4700:
4701: Retreive an array of the possible previous resources from this
4702: one. Always returns an array, even in the one- or zero-element case.
4703:
4704: =cut
4705:
4706: sub getNext {
4707: my $self = shift;
4708: my @branches;
4709: my $to = $self->to();
4710: foreach my $branch ( split(/,/, $to) ) {
4711: my $choice = $self->{NAV_MAP}->getById($branch);
4712: if (!$choice->condition()) { next; }
4713: my $next = $choice->goesto();
4714: $next = $self->{NAV_MAP}->getById($next);
4715:
4716: push @branches, $next;
4717: }
4718: return \@branches;
4719: }
4720:
4721: sub getPrevious {
4722: my $self = shift;
4723: my @branches;
4724: my $from = $self->from();
4725: foreach my $branch ( split /,/, $from) {
4726: my $choice = $self->{NAV_MAP}->getById($branch);
4727: my $prev = $choice->comesfrom();
4728: $prev = $self->{NAV_MAP}->getById($prev);
4729:
4730: push @branches, $prev;
4731: }
4732: return \@branches;
4733: }
4734:
4735: sub browsePriv {
4736: my $self = shift;
4737: if (defined($self->{BROWSE_PRIV})) {
4738: return $self->{BROWSE_PRIV};
4739: }
4740:
4741: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4742: $self->symb());
4743: }
4744:
4745: =pod
4746:
4747: =back
4748:
4749: =cut
4750:
4751: 1;
4752:
4753: __END__
4754:
4755:
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