1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.340 2005/09/23 22:21:51 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use GDBM_File;
34: use Apache::Constants qw(:common :http);
35: use Apache::loncommon();
36: use Apache::lonmenu();
37: use Apache::lonenc();
38: use Apache::lonlocal;
39: use Apache::lonnet;
40: use POSIX qw (floor strftime);
41: use Data::Dumper; # for debugging, not always
42: use Time::HiRes qw( gettimeofday tv_interval );
43:
44: # symbolic constants
45: sub SYMB { return 1; }
46: sub URL { return 2; }
47: sub NOTHING { return 3; }
48:
49: # Some data
50:
51: my $resObj = "Apache::lonnavmaps::resource";
52:
53: # Keep these mappings in sync with lonquickgrades, which uses the colors
54: # instead of the icons.
55: my %statusIconMap =
56: (
57: $resObj->CLOSED => '',
58: $resObj->OPEN => 'navmap.open.gif',
59: $resObj->CORRECT => 'navmap.correct.gif',
60: $resObj->PARTIALLY_CORRECT => 'navmap.ellipsis.gif',
61: $resObj->INCORRECT => 'navmap.wrong.gif',
62: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
63: $resObj->ERROR => ''
64: );
65:
66: my %iconAltTags =
67: ( 'navmap.correct.gif' => 'Correct',
68: 'navmap.wrong.gif' => 'Incorrect',
69: 'navmap.open.gif' => 'Open' );
70:
71: # Defines a status->color mapping, null string means don't color
72: my %colormap =
73: ( $resObj->NETWORK_FAILURE => '',
74: $resObj->CORRECT => '',
75: $resObj->EXCUSED => '#3333FF',
76: $resObj->PAST_DUE_ANSWER_LATER => '',
77: $resObj->PAST_DUE_NO_ANSWER => '',
78: $resObj->ANSWER_OPEN => '#006600',
79: $resObj->OPEN_LATER => '',
80: $resObj->TRIES_LEFT => '',
81: $resObj->INCORRECT => '',
82: $resObj->OPEN => '',
83: $resObj->NOTHING_SET => '',
84: $resObj->ATTEMPTED => '',
85: $resObj->ANSWER_SUBMITTED => '',
86: $resObj->PARTIALLY_CORRECT => '#006600'
87: );
88: # And a special case in the nav map; what to do when the assignment
89: # is not yet done and due in less then 24 hours
90: my $hurryUpColor = "#FF0000";
91:
92: sub launch_win {
93: my ($mode,$script,$toplinkitems,$firsttime)=@_;
94: my $result;
95: if ($script ne 'no') {
96: $result.='<script type="text/javascript">';
97: }
98: if ($firsttime) {
99: $result.='function launch_navmapwin() {
100: newWindow=open(\'/adm/navmaps?launchExternalRoles\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
101: }';
102: } else {
103: $result.='function launch_navmapwin() {
104: newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
105: }';
106: }
107: if ($mode eq 'now') {
108: $result.="\nlaunch_navmapwin();\n";
109: }
110: if ($script ne 'no') {
111: $result.='</script>';
112: }
113: if ($mode eq 'link') {
114: &add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
115: "Launch navigation window");
116: }
117: return $result;
118: }
119:
120: sub close {
121: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
122: return(<<ENDCLOSE);
123: <script type="text/javascript">
124: window.status='Accessing Nav Control';
125: menu=window.open("/adm/rat/empty.html","loncapanav",
126: "height=600,width=400,scrollbars=1");
127: window.status='Closing Nav Control';
128: menu.close();
129: window.status='Done.';
130: </script>
131: ENDCLOSE
132: }
133:
134: sub update {
135: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
136: if (!$env{'request.course.id'}) { return ''; }
137: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
138: return(<<ENDUPDATE);
139: <form name="navform"></form>
140: <script type="text/javascript">
141: this.document.navform.action='/adm/navmaps#curloc';
142: this.document.navform.target='loncapanav';
143: this.document.navform.submit();
144: </script>
145: ENDUPDATE
146: }
147:
148: sub handler {
149: my $r = shift;
150: real_handler($r);
151: }
152:
153: sub real_handler {
154: my $r = shift;
155: #my $t0=[&gettimeofday()];
156: # Handle header-only request
157: if ($r->header_only) {
158: if ($env{'browser.mathml'}) {
159: &Apache::loncommon::content_type($r,'text/xml');
160: } else {
161: &Apache::loncommon::content_type($r,'text/html');
162: }
163: $r->send_http_header;
164: return OK;
165: }
166:
167: # Send header, don't cache this page
168: if ($env{'browser.mathml'}) {
169: &Apache::loncommon::content_type($r,'text/xml');
170: } else {
171: &Apache::loncommon::content_type($r,'text/html');
172: }
173: &Apache::loncommon::no_cache($r);
174: $r->send_http_header;
175:
176: my %toplinkitems=();
177: &add_linkitem(\%toplinkitems,'blank','',"Select Action");
178: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
179: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
180: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
181: my $menu=&Apache::lonmenu::reopenmenu();
182: my $navstatus=&Apache::lonmenu::get_nav_status();
183: if ($menu) {
184: $menu=(<<MENU)
185: swmenu=$menu
186: swmenu.clearTimeout(swmenu.menucltim);
187: $navstatus
188: MENU
189: } else {
190: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
191: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
192: $menu=(<<MENU)
193: swmenu=$mainwindow
194: $navstatus
195: MENU
196: }
197: my $html=&Apache::lonxml::xmlbegin();
198: $r->print(<<"ENDSUBM");
199: $html
200: <head>
201: <script type="text/javascript">
202: function submitthis() {
203: $menu
204: self.close();
205: }
206:
207: </script>
208: </head>
209: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
210: </html>
211: ENDSUBM
212: return;
213: }
214: if ($ENV{QUERY_STRING} =~ /^launchExternal/) {
215: &Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
216: &Apache::lonnet::appenv('environment.remotenavmap' => 'on');
217: my $menu=&Apache::lonmenu::reopenmenu();
218: my $navstatus=&Apache::lonmenu::get_nav_status();
219: if ($menu) {
220: $r->print(<<MENU);
221: <script type="text/javascript">
222: swmenu=$menu
223: swmenu.clearTimeout(swmenu.menucltim);
224: $navstatus
225: </script>
226: MENU
227: }
228: }
229: if ($ENV{QUERY_STRING} eq 'turningOffExternal') {
230: $env{'environment.remotenavmap'}='off';
231: }
232:
233: # Create the nav map
234: my $navmap = Apache::lonnavmaps::navmap->new();
235:
236: if (!defined($navmap)) {
237: my $requrl = $r->uri;
238: $env{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
239: return HTTP_NOT_ACCEPTABLE;
240: }
241: my $html=&Apache::lonxml::xmlbegin();
242: $r->print("$html<head>\n");
243: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
244: # ------------------------------------------------------------ Get query string
245: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework','postsymb']);
246:
247: # ----------------------------------------------------- Force menu registration
248: my $addentries='';
249: my $more_unload;
250: my $body_only='';
251: if ($env{'environment.remotenavmap'} eq 'on') {
252: $r->print('<script type="text/javascript">
253: function collapse() {
254: this.document.location="/adm/navmaps?collapseExternal";
255: }
256: </script>');
257: # FIXME need to be smarter to only catch window close events
258: # $more_unload="collapse()"
259: $body_only=1;
260: }
261: if ($env{'form.register'}) {
262: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
263: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
264: $more_unload.'"';
265: $r->print(&Apache::lonmenu::registerurl(1));
266: } else {
267: $addentries=' onUnload="'.$more_unload.'"';
268: }
269:
270: # Header
271: $r->print('</head>'.
272: &Apache::loncommon::bodytag('Navigate Course Contents','',
273: $addentries,$body_only,'',
274: $env{'form.register'}));
275: $r->print('<script>window.focus();</script>');
276:
277: $r->rflush();
278:
279: # Check that it's defined
280: if (!($navmap->courseMapDefined())) {
281: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
282: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
283: '</body></html>');
284: return OK;
285: }
286:
287: # See if there's only one map in the top-level, if we don't
288: # already have a filter... if so, automatically display it
289: # (older code; should use retrieveResources)
290: if ($ENV{QUERY_STRING} !~ /filter/) {
291: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
292: my $curRes;
293: my $sequenceCount = 0;
294: my $sequenceId;
295: while ($curRes = $iterator->next()) {
296: if (ref($curRes) && $curRes->is_sequence()) {
297: $sequenceCount++;
298: $sequenceId = $curRes->map_pc();
299: }
300: }
301:
302: if ($sequenceCount == 1) {
303: # The automatic iterator creation in the render call
304: # will pick this up. We know the condition because
305: # the defined($env{'form.filter'}) also ensures this
306: # is a fresh call.
307: $env{'form.filter'} = "$sequenceId";
308: }
309: }
310:
311: if ($ENV{QUERY_STRING} eq 'launchExternal') {
312: $r->print('
313: <form name="returnwin" action="/adm/flip?postdata=navlaunch%3a"
314: method="post" target="loncapaclient">
315: </form>');
316: $r->print('
317: <script type="text/javascript">
318: this.document.returnwin.submit();
319: </script>');
320: }
321:
322: if ($env{'environment.remotenavmap'} ne 'on') {
323: $r->print(&launch_win('link','yes',\%toplinkitems));
324: }
325: if ($env{'environment.remotenavmap'} eq 'on') {
326: &add_linkitem(\%toplinkitems,'closenav','collapse()',
327: "Close navigation window");
328: }
329:
330: my $jumpToFirstHomework = 0;
331: # Check to see if the student is jumping to next open, do-able problem
332: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
333: $jumpToFirstHomework = 1;
334: # Find the next homework problem that they can do.
335: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
336: my $curRes;
337: my $foundDoableProblem = 0;
338: my $problemRes;
339:
340: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
341: if (ref($curRes) && $curRes->is_problem()) {
342: my $status = $curRes->status();
343: if ($curRes->completable()) {
344: $problemRes = $curRes;
345: $foundDoableProblem = 1;
346:
347: # Pop open all previous maps
348: my $stack = $iterator->getStack();
349: pop @$stack; # last resource in the stack is the problem
350: # itself, which we don't need in the map stack
351: my @mapPcs = map {$_->map_pc()} @$stack;
352: $env{'form.filter'} = join(',', @mapPcs);
353:
354: # Mark as both "here" and "jump"
355: $env{'form.postsymb'} = $curRes->symb();
356: }
357: }
358: }
359:
360: # If we found no problems, print a note to that effect.
361: if (!$foundDoableProblem) {
362: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
363: }
364: } else {
365: &add_linkitem(\%toplinkitems,'firsthomework',
366: 'location.href="navmaps?jumpToFirstHomework"',
367: "Show Me My First Homework Problem");
368: }
369:
370: my $suppressEmptySequences = 0;
371: my $filterFunc = undef;
372: my $resource_no_folder_link = 0;
373:
374: # Display only due homework.
375: my $showOnlyHomework = 0;
376: if ($env{'form.showOnlyHomework'} eq "1") {
377: $showOnlyHomework = 1;
378: $suppressEmptySequences = 1;
379: $filterFunc = sub { my $res = shift;
380: return $res->completable() || $res->is_map();
381: };
382: &add_linkitem(\%toplinkitems,'everything',
383: 'location.href="navmaps?sort='.$env{'form.sort'}.'"',
384: "Show Everything");
385: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
386: $env{'form.filter'} = '';
387: $env{'form.condition'} = 1;
388: $resource_no_folder_link = 1;
389: } else {
390: &add_linkitem(\%toplinkitems,'uncompleted',
391: 'location.href="navmaps?sort='.$env{'form.sort'}.
392: '&showOnlyHomework=1"',
393: "Show Only Uncompleted Homework");
394: }
395:
396: my %selected=($env{'form.sort'} => 'selected=on');
397: my $sort_html=("<form>
398: <nobr>
399: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$env{'form.showOnlyHomework'}."\" />
400: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
401: <select name=\"sort\">
402: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
403: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
404: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
405: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has New Discussion')."</option>
406: </select>
407: </nobr>
408: </form>");
409: # renderer call
410: my $renderArgs = { 'cols' => [0,1,2,3],
411: 'sort' => $env{'form.sort'},
412: 'url' => '/adm/navmaps',
413: 'navmap' => $navmap,
414: 'suppressNavmap' => 1,
415: 'suppressEmptySequences' => $suppressEmptySequences,
416: 'filterFunc' => $filterFunc,
417: 'resource_no_folder_link' => $resource_no_folder_link,
418: 'sort_html'=> $sort_html,
419: 'r' => $r,
420: 'caller' => 'navmapsdisplay',
421: 'linkitems' => \%toplinkitems};
422: my $render = render($renderArgs);
423:
424: # If no resources were printed, print a reassuring message so the
425: # user knows there was no error.
426: if ($renderArgs->{'counter'} == 0) {
427: if ($showOnlyHomework) {
428: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
429: } else { # both jumpToFirstHomework and normal use the same: course must be empty
430: $r->print("<p><font size='+1'>This course is empty.</font></p>");
431: }
432: }
433: #my $td=&tv_interval($t0);
434: #$r->print("<br />$td");
435:
436: $r->print("</body></html>");
437: $r->rflush();
438:
439: return OK;
440: }
441:
442: # Convenience functions: Returns a string that adds or subtracts
443: # the second argument from the first hash, appropriate for the
444: # query string that determines which folders to recurse on
445: sub addToFilter {
446: my $hashIn = shift;
447: my $addition = shift;
448: my %hash = %$hashIn;
449: $hash{$addition} = 1;
450:
451: return join (",", keys(%hash));
452: }
453:
454: sub removeFromFilter {
455: my $hashIn = shift;
456: my $subtraction = shift;
457: my %hash = %$hashIn;
458:
459: delete $hash{$subtraction};
460: return join(",", keys(%hash));
461: }
462:
463: # Convenience function: Given a stack returned from getStack on the iterator,
464: # return the correct src() value.
465: sub getLinkForResource {
466: my $stack = shift;
467: my $res;
468:
469: # Check to see if there are any pages in the stack
470: foreach $res (@$stack) {
471: if (defined($res)) {
472: my $anchor;
473: if ($res->is_page()) {
474: foreach (@$stack) { if (defined($_)) { $anchor = $_; } }
475: $anchor=&Apache::lonnet::escape($anchor->shown_symb());
476: return ($res->link(),$res->shown_symb(),$anchor);
477: }
478: # in case folder was skipped over as "only sequence"
479: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
480: if ($map=~/\.page$/) {
481: my $url=&Apache::lonnet::clutter($map);
482: $anchor=&Apache::lonnet::escape($src->shown_symb());
483: return ($url,$res->shown_symb(),$anchor);
484: }
485: }
486: }
487:
488: # Failing that, return the src of the last resource that is defined
489: # (when we first recurse on a map, it puts an undefined resource
490: # on the bottom because $self->{HERE} isn't defined yet, and we
491: # want the src for the map anyhow)
492: foreach (@$stack) {
493: if (defined($_)) { $res = $_; }
494: }
495:
496: return ($res->link(),$res->shown_symb());
497: }
498:
499: # Convenience function: This separates the logic of how to create
500: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
501: # etc.) into a separate function. It takes a resource object as the
502: # first parameter, and the part number of the resource as the second.
503: # It's basically a big switch statement on the status of the resource.
504:
505: sub getDescription {
506: my $res = shift;
507: my $part = shift;
508: my $status = $res->status($part);
509:
510: if ($status == $res->NETWORK_FAILURE) {
511: return &mt("Having technical difficulties; please check status later");
512: }
513: if ($status == $res->NOTHING_SET) {
514: return &mt("Not currently assigned.");
515: }
516: if ($status == $res->OPEN_LATER) {
517: return "Open " . timeToHumanString($res->opendate($part));
518: }
519: if ($status == $res->OPEN) {
520: if ($res->duedate($part)) {
521: return &mt("Due")." " .timeToHumanString($res->duedate($part));
522: } else {
523: return &mt("Open, no due date");
524: }
525: }
526: if ($status == $res->PAST_DUE_ANSWER_LATER) {
527: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
528: }
529: if ($status == $res->PAST_DUE_NO_ANSWER) {
530: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
531: }
532: if ($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT) {
533: return &mt("Answer available");
534: }
535: if ($status == $res->EXCUSED) {
536: return &mt("Excused by instructor");
537: }
538: if ($status == $res->ATTEMPTED) {
539: return &mt("Answer submitted, not yet graded");
540: }
541: if ($status == $res->TRIES_LEFT) {
542: my $tries = $res->tries($part);
543: my $maxtries = $res->maxtries($part);
544: my $triesString = "";
545: if ($tries && $maxtries) {
546: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
547: if ($maxtries > 1 && $maxtries - $tries == 1) {
548: $triesString = "<b>$triesString</b>";
549: }
550: }
551: if ($res->duedate($part)) {
552: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
553: " $triesString";
554: } else {
555: return &mt("No due date")." $triesString";
556: }
557: }
558: if ($status == $res->ANSWER_SUBMITTED) {
559: return &mt('Answer submitted');
560: }
561: }
562:
563: # Convenience function, so others can use it: Is the problem due in less then
564: # 24 hours, and still can be done?
565:
566: sub dueInLessThan24Hours {
567: my $res = shift;
568: my $part = shift;
569: my $status = $res->status($part);
570:
571: return ($status == $res->OPEN() ||
572: $status == $res->TRIES_LEFT()) &&
573: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
574: $res->duedate($part) > time();
575: }
576:
577: # Convenience function, so others can use it: Is there only one try remaining for the
578: # part, with more then one try to begin with, not due yet and still can be done?
579: sub lastTry {
580: my $res = shift;
581: my $part = shift;
582:
583: my $tries = $res->tries($part);
584: my $maxtries = $res->maxtries($part);
585: return $tries && $maxtries && $maxtries > 1 &&
586: $maxtries - $tries == 1 && $res->duedate($part) &&
587: $res->duedate($part) > time();
588: }
589:
590: # This puts a human-readable name on the env variable.
591:
592: sub advancedUser {
593: return $env{'request.role.adv'};
594: }
595:
596:
597: # timeToHumanString takes a time number and converts it to a
598: # human-readable representation, meant to be used in the following
599: # manner:
600: # print "Due $timestring"
601: # print "Open $timestring"
602: # print "Answer available $timestring"
603: # Very, very, very, VERY English-only... goodness help a localizer on
604: # this func...
605: sub timeToHumanString {
606: my ($time) = @_;
607: # zero, '0' and blank are bad times
608: if (!$time) {
609: return &mt('never');
610: }
611: unless (&Apache::lonlocal::current_language()=~/^en/) {
612: return &Apache::lonlocal::locallocaltime($time);
613: }
614: my $now = time();
615:
616: my @time = localtime($time);
617: my @now = localtime($now);
618:
619: # Positive = future
620: my $delta = $time - $now;
621:
622: my $minute = 60;
623: my $hour = 60 * $minute;
624: my $day = 24 * $hour;
625: my $week = 7 * $day;
626: my $inPast = 0;
627:
628: # Logic in comments:
629: # Is it now? (extremely unlikely)
630: if ( $delta == 0 ) {
631: return "this instant";
632: }
633:
634: if ($delta < 0) {
635: $inPast = 1;
636: $delta = -$delta;
637: }
638:
639: if ( $delta > 0 ) {
640:
641: my $tense = $inPast ? " ago" : "";
642: my $prefix = $inPast ? "" : "in ";
643:
644: # Less then a minute
645: if ( $delta < $minute ) {
646: if ($delta == 1) { return "${prefix}1 second$tense"; }
647: return "$prefix$delta seconds$tense";
648: }
649:
650: # Less then an hour
651: if ( $delta < $hour ) {
652: # If so, use minutes
653: my $minutes = floor($delta / 60);
654: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
655: return "$prefix$minutes minutes$tense";
656: }
657:
658: # Is it less then 24 hours away? If so,
659: # display hours + minutes
660: if ( $delta < $hour * 24) {
661: my $hours = floor($delta / $hour);
662: my $minutes = floor(($delta % $hour) / $minute);
663: my $hourString = "$hours hours";
664: my $minuteString = ", $minutes minutes";
665: if ($hours == 1) {
666: $hourString = "1 hour";
667: }
668: if ($minutes == 1) {
669: $minuteString = ", 1 minute";
670: }
671: if ($minutes == 0) {
672: $minuteString = "";
673: }
674: return "$prefix$hourString$minuteString$tense";
675: }
676:
677: # Less then 5 days away, display day of the week and
678: # HH:MM
679: if ( $delta < $day * 5 ) {
680: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
681: $timeStr =~ s/12:00 am/00:00/;
682: $timeStr =~ s/12:00 pm/noon/;
683: return ($inPast ? "last " : "this ") .
684: $timeStr;
685: }
686:
687: # Is it this year?
688: if ( $time[5] == $now[5]) {
689: # Return on Month Day, HH:MM meridian
690: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
691: $timeStr =~ s/12:00 am/00:00/;
692: $timeStr =~ s/12:00 pm/noon/;
693: return $timeStr;
694: }
695:
696: # Not this year, so show the year
697: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
698: $timeStr =~ s/12:00 am/00:00/;
699: $timeStr =~ s/12:00 pm/noon/;
700: return $timeStr;
701: }
702: }
703:
704:
705: =pod
706:
707: =head1 NAME
708:
709: Apache::lonnavmap - Subroutines to handle and render the navigation
710: maps
711:
712: =head1 SYNOPSIS
713:
714: The main handler generates the navigational listing for the course,
715: the other objects export this information in a usable fashion for
716: other modules.
717:
718: =head1 OVERVIEW
719:
720: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
721: course structure and caches it in what is often referred to as the
722: "big hash" X<big hash>. You can see it if you are logged into
723: LON-CAPA, in a course, by going to /adm/test. (You may need to
724: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
725: content of the hash will be under the heading "Big Hash".
726:
727: Big Hash contains, among other things, how resources are related
728: to each other (next/previous), what resources are maps, which
729: resources are being chosen to not show to the student (for random
730: selection), and a lot of other things that can take a lot of time
731: to compute due to the amount of data that needs to be collected and
732: processed.
733:
734: Apache::lonnavmaps provides an object model for manipulating this
735: information in a higher-level fashion then directly manipulating
736: the hash. It also provides access to several auxilary functions
737: that aren't necessarily stored in the Big Hash, but are a per-
738: resource sort of value, like whether there is any feedback on
739: a given resource.
740:
741: Apache::lonnavmaps also abstracts away branching, and someday,
742: conditions, for the times where you don't really care about those
743: things.
744:
745: Apache::lonnavmaps also provides fairly powerful routines for
746: rendering navmaps, and last but not least, provides the navmaps
747: view for when the user clicks the NAV button.
748:
749: B<Note>: Apache::lonnavmaps I<only> works for the "currently
750: logged in user"; if you want things like "due dates for another
751: student" lonnavmaps can not directly retrieve information like
752: that. You need the EXT function. This module can still help,
753: because many things, such as the course structure, are constant
754: between users, and Apache::lonnavmaps can help by providing
755: symbs for the EXT call.
756:
757: The rest of this file will cover the provided rendering routines,
758: which can often be used without fiddling with the navmap object at
759: all, then documents the Apache::lonnavmaps::navmap object, which
760: is the key to accessing the Big Hash information, covers the use
761: of the Iterator (which provides the logic for traversing the
762: somewhat-complicated Big Hash data structure), documents the
763: Apache::lonnavmaps::Resource objects that are returned by
764:
765: =head1 Subroutine: render
766:
767: The navmap renderer package provides a sophisticated rendering of the
768: standard navigation maps interface into HTML. The provided nav map
769: handler is actually just a glorified call to this.
770:
771: Because of the large number of parameters this function accepts,
772: instead of passing it arguments as is normal, pass it in an anonymous
773: hash with the desired options.
774:
775: The package provides a function called 'render', called as
776: Apache::lonnavmaps::render({}).
777:
778: =head2 Overview of Columns
779:
780: The renderer will build an HTML table for the navmap and return
781: it. The table is consists of several columns, and a row for each
782: resource (or possibly each part). You tell the renderer how many
783: columns to create and what to place in each column, optionally using
784: one or more of the prepared columns, and the renderer will assemble
785: the table.
786:
787: Any additional generally useful column types should be placed in the
788: renderer code here, so anybody can use it anywhere else. Any code
789: specific to the current application (such as the addition of <input>
790: elements in a column) should be placed in the code of the thing using
791: the renderer.
792:
793: At the core of the renderer is the array reference COLS (see Example
794: section below for how to pass this correctly). The COLS array will
795: consist of entries of one of two types of things: Either an integer
796: representing one of the pre-packaged column types, or a sub reference
797: that takes a resource reference, a part number, and a reference to the
798: argument hash passed to the renderer, and returns a string that will
799: be inserted into the HTML representation as it.
800:
801: All other parameters are ways of either changing how the columns
802: are printing, or which rows are shown.
803:
804: The pre-packaged column names are refered to by constants in the
805: Apache::lonnavmaps namespace. The following currently exist:
806:
807: =over 4
808:
809: =item * B<Apache::lonnavmaps::resource>:
810:
811: The general info about the resource: Link, icon for the type, etc. The
812: first column in the standard nav map display. This column provides the
813: indentation effect seen in the B<NAV> screen. This column also accepts
814: the following parameters in the renderer hash:
815:
816: =over 4
817:
818: =item * B<resource_nolink>: default false
819:
820: If true, the resource will not be linked. By default, all non-folder
821: resources are linked.
822:
823: =item * B<resource_part_count>: default true
824:
825: If true, the resource will show a part count B<if> the full
826: part list is not displayed. (See "condense_parts" later.) If false,
827: the resource will never show a part count.
828:
829: =item * B<resource_no_folder_link>:
830:
831: If true, the resource's folder will not be clickable to open or close
832: it. Default is false. True implies printCloseAll is false, since you
833: can't close or open folders when this is on anyhow.
834:
835: =back
836:
837: =item * B<Apache::lonnavmaps::communication_status>:
838:
839: Whether there is discussion on the resource, email for the user, or
840: (lumped in here) perl errors in the execution of the problem. This is
841: the second column in the main nav map.
842:
843: =item * B<Apache::lonnavmaps::quick_status>:
844:
845: An icon for the status of a problem, with five possible states:
846: Correct, incorrect, open, awaiting grading (for a problem where the
847: computer's grade is suppressed, or the computer can't grade, like
848: essay problem), or none (not open yet, not a problem). The
849: third column of the standard navmap.
850:
851: =item * B<Apache::lonnavmaps::long_status>:
852:
853: A text readout of the details of the current status of the problem,
854: such as "Due in 22 hours". The fourth column of the standard navmap.
855:
856: =item * B<Apache::lonnavmaps::part_status_summary>:
857:
858: A text readout summarizing the status of the problem. If it is a
859: single part problem, will display "Correct", "Incorrect",
860: "Not yet open", "Open", "Attempted", or "Error". If there are
861: multiple parts, this will output a string that in HTML will show a
862: status of how many parts are in each status, in color coding, trying
863: to match the colors of the icons within reason.
864:
865: Note this only makes sense if you are I<not> showing parts. If
866: C<showParts> is true (see below), this column will not output
867: anything.
868:
869: =back
870:
871: If you add any others please be sure to document them here.
872:
873: An example of a column renderer that will show the ID number of a
874: resource, along with the part name if any:
875:
876: sub {
877: my ($resource, $part, $params) = @_;
878: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
879: return '<td>' . $resource->{ID} . '</td>';
880: }
881:
882: Note these functions are responsible for the TD tags, which allow them
883: to override vertical and horizontal alignment, etc.
884:
885: =head2 Parameters
886:
887: Minimally, you should be
888: able to get away with just using 'cols' (to specify the columns
889: shown), 'url' (necessary for the folders to link to the current screen
890: correctly), and possibly 'queryString' if your app calls for it. In
891: that case, maintaining the state of the folders will be done
892: automatically.
893:
894: =over 4
895:
896: =item * B<iterator>: default: constructs one from %env
897:
898: A reference to a fresh ::iterator to use from the navmaps. The
899: rendering will reflect the options passed to the iterator, so you can
900: use that to just render a certain part of the course, if you like. If
901: one is not passed, the renderer will attempt to construct one from
902: env{'form.filter'} and env{'form.condition'} information, plus the
903: 'iterator_map' parameter if any.
904:
905: =item * B<iterator_map>: default: not used
906:
907: If you are letting the renderer do the iterator handling, you can
908: instruct the renderer to render only a particular map by passing it
909: the source of the map you want to process, like
910: '/res/103/jerf/navmap.course.sequence'.
911:
912: =item * B<navmap>: default: constructs one from %env
913:
914: A reference to a navmap, used only if an iterator is not passed in. If
915: this is necessary to make an iterator but it is not passed in, a new
916: one will be constructed based on env info. This is useful to do basic
917: error checking before passing it off to render.
918:
919: =item * B<r>: default: must be passed in
920:
921: The standard Apache response object. This must be passed to the
922: renderer or the course hash will be locked.
923:
924: =item * B<cols>: default: empty (useless)
925:
926: An array reference
927:
928: =item * B<showParts>:default true
929:
930: A flag. If true, a line for the resource itself, and a line
931: for each part will be displayed. If not, only one line for each
932: resource will be displayed.
933:
934: =item * B<condenseParts>: default true
935:
936: A flag. If true, if all parts of the problem have the same
937: status and that status is Nothing Set, Correct, or Network Failure,
938: then only one line will be displayed for that resource anyhow. If no,
939: all parts will always be displayed. If showParts is 0, this is
940: ignored.
941:
942: =item * B<jumpCount>: default: determined from %env
943:
944: A string identifying the URL to place the anchor 'curloc' at.
945: It is the responsibility of the renderer user to
946: ensure that the #curloc is in the URL. By default, determined through
947: the use of the env{} 'jump' information, and should normally "just
948: work" correctly.
949:
950: =item * B<here>: default: empty string
951:
952: A Symb identifying where to place the 'here' marker. The empty
953: string means no marker.
954:
955: =item * B<indentString>: default: 25 pixel whitespace image
956:
957: A string identifying the indentation string to use.
958:
959: =item * B<queryString>: default: empty
960:
961: A string which will be prepended to the query string used when the
962: folders are opened or closed. You can use this to pass
963: application-specific values.
964:
965: =item * B<url>: default: none
966:
967: The url the folders will link to, which should be the current
968: page. Required if the resource info column is shown, and you
969: are allowing the user to open and close folders.
970:
971: =item * B<currentJumpIndex>: default: no jumping
972:
973: Describes the currently-open row number to cause the browser to jump
974: to, because the user just opened that folder. By default, pulled from
975: the Jump information in the env{'form.*'}.
976:
977: =item * B<printKey>: default: false
978:
979: If true, print the key that appears on the top of the standard
980: navmaps.
981:
982: =item * B<printCloseAll>: default: true
983:
984: If true, print the "Close all folders" or "open all folders"
985: links.
986:
987: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
988:
989: A function that takes the resource object as its only parameter and
990: returns a true or false value. If true, the resource is displayed. If
991: false, it is simply skipped in the display.
992:
993: =item * B<suppressEmptySequences>: default: false
994:
995: If you're using a filter function, and displaying sequences to orient
996: the user, then frequently some sequences will be empty. Setting this to
997: true will cause those sequences not to display, so as not to confuse the
998: user into thinking that if the sequence is there there should be things
999: under it; for example, see the "Show Uncompleted Homework" view on the
1000: B<NAV> screen.
1001:
1002: =item * B<suppressNavmaps>: default: false
1003:
1004: If true, will not display Navigate Content resources.
1005:
1006: =back
1007:
1008: =head2 Additional Info
1009:
1010: In addition to the parameters you can pass to the renderer, which will
1011: be passed through unchange to the column renderers, the renderer will
1012: generate the following information which your renderer may find
1013: useful:
1014:
1015: =over 4
1016:
1017: =item * B<counter>:
1018:
1019: Contains the number of rows printed. Useful after calling the render
1020: function, as you can detect whether anything was printed at all.
1021:
1022: =item * B<isNewBranch>:
1023:
1024: Useful for renderers: If this resource is currently the first resource
1025: of a new branch, this will be true. The Resource column (leftmost in the
1026: navmaps screen) uses this to display the "new branch" icon
1027:
1028: =back
1029:
1030: =cut
1031:
1032: sub resource { return 0; }
1033: sub communication_status { return 1; }
1034: sub quick_status { return 2; }
1035: sub long_status { return 3; }
1036: sub part_status_summary { return 4; }
1037:
1038: sub render_resource {
1039: my ($resource, $part, $params) = @_;
1040:
1041: my $nonLinkedText = ''; # stuff after resource title not in link
1042:
1043: my $link = $params->{"resourceLink"};
1044:
1045: # The URL part is not escaped at this point, but the symb is...
1046: # The stuff to the left of the ? must have ' replaced by \' since
1047: # it will be quoted with ' in the href.
1048:
1049: my ($left,$right) = split(/\?/, $link);
1050: $left =~ s/'/\\'/g;
1051: $link = $left.'?'.$right;
1052:
1053: my $src = $resource->src();
1054: my $it = $params->{"iterator"};
1055: my $filter = $it->{FILTER};
1056:
1057: my $title = $resource->compTitle();
1058:
1059: my $partLabel = "";
1060: my $newBranchText = "";
1061: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1062: # If this is a new branch, label it so
1063: if ($params->{'isNewBranch'}) {
1064: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
1065: }
1066:
1067: # links to open and close the folder
1068:
1069:
1070: my $linkopen = "<a href='$link'>";
1071:
1072:
1073: my $linkclose = "</a>";
1074:
1075: # Default icon: unknown page
1076: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
1077:
1078: if ($resource->is_problem()) {
1079: if ($part eq '0' || $params->{'condensed'}) {
1080: $icon ='<img src="'.$location.'/problem.gif" alt=" " border="0" />';
1081: } else {
1082: $icon = $params->{'indentString'};
1083: }
1084: } else {
1085: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
1086: }
1087:
1088: # Display the correct map icon to open or shut map
1089: if ($resource->is_map()) {
1090: my $mapId = $resource->map_pc();
1091: my $nowOpen = !defined($filter->{$mapId});
1092: if ($it->{CONDITION}) {
1093: $nowOpen = !$nowOpen;
1094: }
1095:
1096: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1097:
1098: if (!$params->{'resource_no_folder_link'}) {
1099: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1100: $icon = "<img src='$location/$icon' alt='".
1101: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1102:
1103: $linkopen = "<a href='" . $params->{'url'} . '?' .
1104: $params->{'queryString'} . '&filter=';
1105: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1106: addToFilter($filter, $mapId) :
1107: removeFromFilter($filter, $mapId);
1108: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1109: . $params->{'hereType'} . '&here=' .
1110: &Apache::lonnet::escape($params->{'here'}) .
1111: '&jump=' .
1112: &Apache::lonnet::escape($resource->symb()) .
1113: "&folderManip=1'>";
1114:
1115: } else {
1116: # Don't allow users to manipulate folder
1117: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1118: '.nomanip.gif';
1119: $icon = "<img src='$location/$icon' alt='".
1120: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1121:
1122: $linkopen = "";
1123: $linkclose = "";
1124: }
1125: }
1126:
1127: if ($resource->randomout()) {
1128: $nonLinkedText .= ' <i>(hidden)</i> ';
1129: }
1130:
1131: # We're done preparing and finally ready to start the rendering
1132: my $result = "<td align='left' valign='center'>";
1133:
1134: my $indentLevel = $params->{'indentLevel'};
1135: if ($newBranchText) { $indentLevel--; }
1136:
1137: # print indentation
1138: for (my $i = 0; $i < $indentLevel; $i++) {
1139: $result .= $params->{'indentString'};
1140: }
1141:
1142: # Decide what to display
1143:
1144: $result .= "$newBranchText$linkopen$icon$linkclose";
1145:
1146: my $curMarkerBegin = '';
1147: my $curMarkerEnd = '';
1148:
1149: # Is this the current resource?
1150: if (!$params->{'displayedHereMarker'} &&
1151: $resource->symb() eq $params->{'here'} ) {
1152: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1153: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1154: $params->{'displayedHereMarker'} = 1;
1155: }
1156:
1157: if ($resource->is_problem() && $part ne '0' &&
1158: !$params->{'condensed'}) {
1159: my $displaypart=$resource->part_display($part);
1160: $partLabel = " (Part: $displaypart)";
1161: if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1162: $title = "";
1163: }
1164:
1165: if ($params->{'condensed'} && $resource->countParts() > 1) {
1166: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1167: }
1168:
1169: my $target;
1170: if ($env{'environment.remotenavmap'} eq 'on') {
1171: $target=' target="loncapaclient" ';
1172: }
1173: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1174: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1175: } else {
1176: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1177: }
1178:
1179: return $result;
1180: }
1181:
1182: sub render_communication_status {
1183: my ($resource, $part, $params) = @_;
1184: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1185:
1186: my $link = $params->{"resourceLink"};
1187: my $target;
1188: if ($env{'environment.remotenavmap'} eq 'on') {
1189: $target=' target="loncapaclient" ';
1190: }
1191: my $linkopen = "<a $target href='$link'>";
1192: my $linkclose = "</a>";
1193: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1194: if ($resource->hasDiscussion()) {
1195: $discussionHTML = $linkopen .
1196: '<img border="0" src="'.$location.'/chat.gif" />' .
1197: $linkclose;
1198: }
1199:
1200: if ($resource->getFeedback()) {
1201: my $feedback = $resource->getFeedback();
1202: foreach (split(/\,/, $feedback)) {
1203: if ($_) {
1204: $feedbackHTML .= ' <a '.$target.' href="/adm/email?display='
1205: . &Apache::lonnet::escape($_) . '">'
1206: . '<img src="'.$location.'/feedback.gif" '
1207: . 'border="0" /></a>';
1208: }
1209: }
1210: }
1211:
1212: if ($resource->getErrors()) {
1213: my $errors = $resource->getErrors();
1214: my $errorcount = 0;
1215: foreach (split(/,/, $errors)) {
1216: last if ($errorcount>=10); # Only output 10 bombs maximum
1217: if ($_) {
1218: $errorcount++;
1219: $errorHTML .= ' <a '.$target.' href="/adm/email?display='
1220: . &Apache::lonnet::escape($_) . '">'
1221: . '<img src="'.$location.'/bomb.gif" '
1222: . 'border="0" /></a>';
1223: }
1224: }
1225: }
1226:
1227: if ($params->{'multipart'} && $part != '0') {
1228: $discussionHTML = $feedbackHTML = $errorHTML = '';
1229: }
1230:
1231: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1232:
1233: }
1234: sub render_quick_status {
1235: my ($resource, $part, $params) = @_;
1236: my $result = "";
1237: my $firstDisplayed = !$params->{'condensed'} &&
1238: $params->{'multipart'} && $part eq "0";
1239:
1240: my $link = $params->{"resourceLink"};
1241: my $target;
1242: if ($env{'environment.remotenavmap'} eq 'on') {
1243: $target=' target="loncapaclient" ';
1244: }
1245: my $linkopen = "<a $target href='$link'>";
1246: my $linkclose = "</a>";
1247:
1248: if ($resource->is_problem() &&
1249: !$firstDisplayed) {
1250:
1251: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1252: my $alt = $iconAltTags{$icon};
1253: if ($icon) {
1254: my $location=
1255: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1256: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1257: } else {
1258: $result .= "<td width='30'> </td>\n";
1259: }
1260: } else { # not problem, no icon
1261: $result .= "<td width='30'> </td>\n";
1262: }
1263:
1264: return $result;
1265: }
1266: sub render_long_status {
1267: my ($resource, $part, $params) = @_;
1268: my $result = "<td align='right' valign='center'>\n";
1269: my $firstDisplayed = !$params->{'condensed'} &&
1270: $params->{'multipart'} && $part eq "0";
1271:
1272: my $color;
1273: if ($resource->is_problem()) {
1274: $color = $colormap{$resource->status};
1275:
1276: if (dueInLessThan24Hours($resource, $part) ||
1277: lastTry($resource, $part)) {
1278: $color = $hurryUpColor;
1279: }
1280: }
1281:
1282: if ($resource->kind() eq "res" &&
1283: $resource->is_problem() &&
1284: !$firstDisplayed) {
1285: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1286: $result .= getDescription($resource, $part);
1287: if ($color) {$result .= "</b></font>"; }
1288: }
1289: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1290: $result .= '(randomly select ' . $resource->randompick() .')';
1291: }
1292:
1293: # Debugging code
1294: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1295: # ' - Part: ' . $part;
1296:
1297: $result .= "</td>\n";
1298:
1299: return $result;
1300: }
1301:
1302: # Colors obtained by taking the icons, matching the colors, and
1303: # possibly reducing the Value (HSV) of the color, if it's too bright
1304: # for text, generally by one third or so.
1305: my %statusColors =
1306: (
1307: $resObj->CLOSED => '#000000',
1308: $resObj->OPEN => '#998b13',
1309: $resObj->CORRECT => '#26933f',
1310: $resObj->INCORRECT => '#c48207',
1311: $resObj->ATTEMPTED => '#a87510',
1312: $resObj->ERROR => '#000000'
1313: );
1314: my %statusStrings =
1315: (
1316: $resObj->CLOSED => 'Not yet open',
1317: $resObj->OPEN => 'Open',
1318: $resObj->CORRECT => 'Correct',
1319: $resObj->INCORRECT => 'Incorrect',
1320: $resObj->ATTEMPTED => 'Attempted',
1321: $resObj->ERROR => 'Network Error'
1322: );
1323: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1324:
1325: use Data::Dumper;
1326: sub render_parts_summary_status {
1327: my ($resource, $part, $params) = @_;
1328: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1329: if ($params->{showParts}) {
1330: return '<td></td>';
1331: }
1332:
1333: my $td = "<td align='right'>\n";
1334: my $endtd = "</td>\n";
1335: my @probs;
1336:
1337: if ($resource->contains_problem) {
1338: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1339: } else {
1340: @probs=($resource);
1341: }
1342: my $return;
1343: my %overallstatus;
1344: my $totalParts;
1345: foreach my $resource (@probs) {
1346: # If there is a single part, just show the simple status
1347: if ($resource->singlepart()) {
1348: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1349: $overallstatus{$status}++;
1350: $totalParts++;
1351: next;
1352: }
1353: # Now we can be sure the $part doesn't really matter.
1354: my $statusCount = $resource->simpleStatusCount();
1355: my @counts;
1356: foreach my $status (@statuses) {
1357: # decouple display order from the simpleStatusCount order
1358: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1359: if ($statusCount->[$slot]) {
1360: $overallstatus{$status}+=$statusCount->[$slot];
1361: $totalParts+=$statusCount->[$slot];
1362: }
1363: }
1364: }
1365: $return.= $td . $totalParts . ' parts: ';
1366: foreach my $status (@statuses) {
1367: if ($overallstatus{$status}) {
1368: $return.="<font color='" . $statusColors{$status} .
1369: "'>" . $overallstatus{$status} . ' '
1370: . $statusStrings{$status} . "</font>";
1371: }
1372: }
1373: $return.= $endtd;
1374: return $return;
1375: }
1376:
1377: my @preparedColumns = (\&render_resource, \&render_communication_status,
1378: \&render_quick_status, \&render_long_status,
1379: \&render_parts_summary_status);
1380:
1381: sub setDefault {
1382: my ($val, $default) = @_;
1383: if (!defined($val)) { return $default; }
1384: return $val;
1385: }
1386:
1387: sub cmp_title {
1388: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1389: $atitle=~s/^\s*//;
1390: $btitle=~s/^\s*//;
1391: return $atitle cmp $btitle;
1392: }
1393:
1394: sub render {
1395: my $args = shift;
1396: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1397: my $result = '';
1398: # Configure the renderer.
1399: my $cols = $args->{'cols'};
1400: if (!defined($cols)) {
1401: # no columns, no nav maps.
1402: return '';
1403: }
1404: my $navmap;
1405: if (defined($args->{'navmap'})) {
1406: $navmap = $args->{'navmap'};
1407: }
1408:
1409: my $r = $args->{'r'};
1410: my $queryString = $args->{'queryString'};
1411: my $jump = $args->{'jump'};
1412: my $here = $args->{'here'};
1413: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1414: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1415: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1416: # before the current resource when using #current
1417:
1418: # If we were passed 'here' information, we are not rendering
1419: # after a folder manipulation, and we were not passed an
1420: # iterator, make sure we open the folders to show the "here"
1421: # marker
1422: my $filterHash = {};
1423: # Figure out what we're not displaying
1424: foreach (split(/\,/, $env{"form.filter"})) {
1425: if ($_) {
1426: $filterHash->{$_} = "1";
1427: }
1428: }
1429:
1430: # Filter: Remember filter function and add our own filter: Refuse
1431: # to show hidden resources unless the user can see them.
1432: my $userCanSeeHidden = advancedUser();
1433: my $filterFunc = setDefault($args->{'filterFunc'},
1434: sub {return 1;});
1435: if (!$userCanSeeHidden) {
1436: # Without renaming the filterfunc, the server seems to go into
1437: # an infinite loop
1438: my $oldFilterFunc = $filterFunc;
1439: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1440: &$oldFilterFunc($res);};
1441: }
1442:
1443: my $condition = 0;
1444: if ($env{'form.condition'}) {
1445: $condition = 1;
1446: }
1447:
1448: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1449: # Step 1: Check to see if we have a navmap
1450: if (!defined($navmap)) {
1451: $navmap = Apache::lonnavmaps::navmap->new();
1452: if (!defined($navmap)) {
1453: # no londer in course
1454: return '<font color="red">No course selected</font><br />
1455: <a href="/adm/roles">Select a course</a><br />';
1456: }
1457: }
1458:
1459: # Step two: Locate what kind of here marker is necessary
1460: # Determine where the "here" marker is and where the screen jumps to.
1461:
1462: if ($env{'form.postsymb'} ne '') {
1463: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1464: } elsif ($env{'form.postdata'} ne '') {
1465: # couldn't find a symb, is there a URL?
1466: my $currenturl = $env{'form.postdata'};
1467: #$currenturl=~s/^http\:\/\///;
1468: #$currenturl=~s/^[^\/]+//;
1469:
1470: $here = $jump = &Apache::lonnet::symbread($currenturl);
1471: }
1472: if ($here eq '') {
1473: my $last;
1474: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1475: &GDBM_READER(),0640)) {
1476: $last=$hash{'last_known'};
1477: untie(%hash);
1478: }
1479: if ($last) { $here = $jump = $last; }
1480: }
1481:
1482: # Step three: Ensure the folders are open
1483: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1484: my $curRes;
1485: my $found = 0;
1486:
1487: # We only need to do this if we need to open the maps to show the
1488: # current position. This will change the counter so we can't count
1489: # for the jump marker with this loop.
1490: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1491: if (ref($curRes) && $curRes->symb() eq $here) {
1492: my $mapStack = $mapIterator->getStack();
1493:
1494: # Ensure the parent maps are open
1495: for my $map (@{$mapStack}) {
1496: if ($condition) {
1497: undef $filterHash->{$map->map_pc()};
1498: } else {
1499: $filterHash->{$map->map_pc()} = 1;
1500: }
1501: }
1502: $found = 1;
1503: }
1504: }
1505: }
1506:
1507: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1508: # If this is a click on a folder or something, we want to preserve the "here"
1509: # from the querystring, and get the new "jump" marker
1510: $here = $env{'form.here'};
1511: $jump = $env{'form.jump'};
1512: }
1513:
1514: my $it = $args->{'iterator'};
1515: if (!defined($it)) {
1516: # Construct a default iterator based on $env{'form.'} information
1517:
1518: # Step 1: Check to see if we have a navmap
1519: if (!defined($navmap)) {
1520: $navmap = Apache::lonnavmaps::navmap->new();
1521: }
1522:
1523: # See if we're being passed a specific map
1524: if ($args->{'iterator_map'}) {
1525: my $map = $args->{'iterator_map'};
1526: $map = $navmap->getResourceByUrl($map);
1527: my $firstResource = $map->map_start();
1528: my $finishResource = $map->map_finish();
1529:
1530: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1531: } else {
1532: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1533: }
1534: }
1535:
1536: # (re-)Locate the jump point, if any
1537: # Note this does not take filtering or hidden into account... need
1538: # to be fixed?
1539: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1540: my $curRes;
1541: my $foundJump = 0;
1542: my $counter = 0;
1543:
1544: while (($curRes = $mapIterator->next()) && !$foundJump) {
1545: if (ref($curRes)) { $counter++; }
1546:
1547: if (ref($curRes) && $jump eq $curRes->symb()) {
1548:
1549: # This is why we have to use the main iterator instead of the
1550: # potentially faster DFS: The count has to be the same, so
1551: # the order has to be the same, which DFS won't give us.
1552: $args->{'currentJumpIndex'} = $counter;
1553: $foundJump = 1;
1554: }
1555: }
1556:
1557: my $showParts = setDefault($args->{'showParts'}, 1);
1558: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1559: # keeps track of when the current resource is found,
1560: # so we can back up a few and put the anchor above the
1561: # current resource
1562: my $printKey = $args->{'printKey'};
1563: my $printCloseAll = $args->{'printCloseAll'};
1564: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1565:
1566: # Print key?
1567: if ($printKey) {
1568: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1569: my $date=localtime;
1570: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1571: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1572: if ($navmap->{LAST_CHECK}) {
1573: $result .=
1574: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1575: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1576: '</td><td align="center" valign="bottom"> '.
1577: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1578: '</td>';
1579: } else {
1580: $result .= '<td align="center" valign="bottom"> '.
1581: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1582: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1583: '</td>';
1584: }
1585:
1586: $result .= '</tr></table>';
1587: }
1588:
1589: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1590: my ($link,$text);
1591: if ($condition) {
1592: $link='"navmaps?condition=0&filter=&'.$queryString.
1593: '&here='.&Apache::lonnet::escape($here).'"';
1594: $text='Close All Folders';
1595: } else {
1596: $link='"navmaps?condition=1&filter=&'.$queryString.
1597: '&here='.&Apache::lonnet::escape($here).'"';
1598: $text='Open All Folders';
1599: }
1600: if ($args->{'caller'} eq 'navmapsdisplay') {
1601: &add_linkitem($args->{'linkitems'},'changefolder',
1602: 'location.href='.$link,$text);
1603: } else {
1604: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1605: }
1606: $result .= "\n";
1607: }
1608:
1609: # Check for any unread discussions in all resources.
1610: if ($args->{'caller'} eq 'navmapsdisplay') {
1611: &add_linkitem($args->{'linkitems'},'clearbubbles',
1612: 'document.clearbubbles.submit()',
1613: 'Mark all posts read');
1614: my $time=time;
1615: $result .= (<<END);
1616: <form name="clearbubbles" method="post" action="/adm/feedback">
1617: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1618: <input type="hidden" name="navtime" value="$time" />
1619: END
1620: if ($args->{'sort'} eq 'discussion') {
1621: my $totdisc = 0;
1622: my $haveDisc = '';
1623: my @allres=$navmap->retrieveResources();
1624: foreach my $resource (@allres) {
1625: if ($resource->hasDiscussion()) {
1626: $haveDisc .= $resource->wrap_symb().':';
1627: $totdisc ++;
1628: }
1629: }
1630: if ($totdisc > 0) {
1631: $haveDisc =~ s/:$//;
1632: $result .= (<<END);
1633: <input type="hidden" name="navmaps" value="$haveDisc" />
1634: </form>
1635: END
1636: }
1637: }
1638: $result.='</form>';
1639: }
1640:
1641: if ($args->{'caller'} eq 'navmapsdisplay') {
1642: $result .= '<table><tr><td>'.
1643: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1644: if ($env{'environment.remotenavmap'} ne 'on') {
1645: $result .= '<td> </td>';
1646: } else {
1647: $result .= '</tr><tr>';
1648: }
1649: $result.=&show_linkitems($args->{'linkitems'});
1650: if ($args->{'sort_html'}) {
1651: if ($env{'environment.remotenavmap'} ne 'on') {
1652: $result.='<td> </td><td> </td><td> </td>'.
1653: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1654: } else {
1655: $result.='</tr><tr><td align="left"><br />'.
1656: $args->{'sort_html'}.'</td></tr>';
1657: }
1658: }
1659: $result .= '</table>';
1660: } elsif ($args->{'sort_html'}) {
1661: $result.=$args->{'sort_html'};
1662: }
1663:
1664: $result .= "<br />\n";
1665: if ($r) {
1666: $r->print($result);
1667: $r->rflush();
1668: $result = "";
1669: }
1670: # End parameter setting
1671:
1672: # Data
1673: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1674: my $res = "Apache::lonnavmaps::resource";
1675: my %condenseStatuses =
1676: ( $res->NETWORK_FAILURE => 1,
1677: $res->NOTHING_SET => 1,
1678: $res->CORRECT => 1 );
1679: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1680:
1681: # Shared variables
1682: $args->{'counter'} = 0; # counts the rows
1683: $args->{'indentLevel'} = 0;
1684: $args->{'isNewBranch'} = 0;
1685: $args->{'condensed'} = 0;
1686: my $location=
1687: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1688: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1689: $args->{'displayedHereMarker'} = 0;
1690:
1691: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1692: # since structure actually doesn't matter, except what map has what resources.
1693: if ($args->{'suppressEmptySequences'}) {
1694: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1695: $it->{FIRST_RESOURCE},
1696: $it->{FINISH_RESOURCE},
1697: {}, undef, 1);
1698: my $depth = 0;
1699: $dfsit->next();
1700: my $curRes = $dfsit->next();
1701: while ($depth > -1) {
1702: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1703: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1704:
1705: if (ref($curRes)) {
1706: # Parallel pre-processing: Do sequences have non-filtered-out children?
1707: if ($curRes->is_map()) {
1708: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1709: # Sequences themselves do not count as visible children,
1710: # unless those sequences also have visible children.
1711: # This means if a sequence appears, there's a "promise"
1712: # that there's something under it if you open it, somewhere.
1713: } else {
1714: # Not a sequence: if it's filtered, ignore it, otherwise
1715: # rise up the stack and mark the sequences as having children
1716: if (&$filterFunc($curRes)) {
1717: for my $sequence (@{$dfsit->getStack()}) {
1718: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1719: }
1720: }
1721: }
1722: }
1723: } continue {
1724: $curRes = $dfsit->next();
1725: }
1726: }
1727:
1728: my $displayedJumpMarker = 0;
1729: # Set up iteration.
1730: my $now = time();
1731: my $in24Hours = $now + 24 * 60 * 60;
1732: my $rownum = 0;
1733:
1734: # export "here" marker information
1735: $args->{'here'} = $here;
1736:
1737: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1738: my @resources;
1739: my $code='';# sub { !(shift->is_map();) };
1740: if ($args->{'sort'} eq 'title') {
1741: my $oldFilterFunc = $filterFunc;
1742: my $filterFunc=
1743: sub {
1744: my ($res)=@_;
1745: if ($res->is_map()) { return 0;}
1746: return &$oldFilterFunc($res);
1747: };
1748: @resources=$navmap->retrieveResources(undef,$filterFunc);
1749: @resources= sort { &cmp_title($a,$b) } @resources;
1750: } elsif ($args->{'sort'} eq 'duedate') {
1751: my $oldFilterFunc = $filterFunc;
1752: my $filterFunc=
1753: sub {
1754: my ($res)=@_;
1755: if (!$res->is_problem()) { return 0;}
1756: return &$oldFilterFunc($res);
1757: };
1758: @resources=$navmap->retrieveResources(undef,$filterFunc);
1759: @resources= sort {
1760: if ($a->duedate ne $b->duedate) {
1761: return $a->duedate cmp $b->duedate;
1762: }
1763: my $value=&cmp_title($a,$b);
1764: return $value;
1765: } @resources;
1766: } elsif ($args->{'sort'} eq 'discussion') {
1767: my $oldFilterFunc = $filterFunc;
1768: my $filterFunc=
1769: sub {
1770: my ($res)=@_;
1771: if (!$res->hasDiscussion() &&
1772: !$res->getFeedback() &&
1773: !$res->getErrors()) { return 0;}
1774: return &$oldFilterFunc($res);
1775: };
1776: @resources=$navmap->retrieveResources(undef,$filterFunc);
1777: @resources= sort { &cmp_title($a,$b) } @resources;
1778: } else {
1779: #unknow sort mechanism or default
1780: undef($args->{'sort'});
1781: }
1782:
1783:
1784: while (1) {
1785: if ($args->{'sort'}) {
1786: $curRes = shift(@resources);
1787: } else {
1788: $curRes = $it->next($closeAllPages);
1789: }
1790: if (!$curRes) { last; }
1791:
1792: # Maintain indentation level.
1793: if ($curRes == $it->BEGIN_MAP() ||
1794: $curRes == $it->BEGIN_BRANCH() ) {
1795: $args->{'indentLevel'}++;
1796: }
1797: if ($curRes == $it->END_MAP() ||
1798: $curRes == $it->END_BRANCH() ) {
1799: $args->{'indentLevel'}--;
1800: }
1801: # Notice new branches
1802: if ($curRes == $it->BEGIN_BRANCH()) {
1803: $args->{'isNewBranch'} = 1;
1804: }
1805:
1806: # If this isn't an actual resource, continue on
1807: if (!ref($curRes)) {
1808: next;
1809: }
1810:
1811: # If this has been filtered out, continue on
1812: if (!(&$filterFunc($curRes))) {
1813: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1814: next;
1815: }
1816:
1817: # If this is an empty sequence and we're filtering them, continue on
1818: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1819: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1820: next;
1821: }
1822:
1823: # If we're suppressing navmaps and this is a navmap, continue on
1824: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1825: next;
1826: }
1827:
1828: $args->{'counter'}++;
1829:
1830: # Does it have multiple parts?
1831: $args->{'multipart'} = 0;
1832: $args->{'condensed'} = 0;
1833: my @parts;
1834:
1835: # Decide what parts to show.
1836: if ($curRes->is_problem() && $showParts) {
1837: @parts = @{$curRes->parts()};
1838: $args->{'multipart'} = $curRes->multipart();
1839:
1840: if ($condenseParts) { # do the condensation
1841: if (!$curRes->opendate("0")) {
1842: @parts = ();
1843: $args->{'condensed'} = 1;
1844: }
1845: if (!$args->{'condensed'}) {
1846: # Decide whether to condense based on similarity
1847: my $status = $curRes->status($parts[0]);
1848: my $due = $curRes->duedate($parts[0]);
1849: my $open = $curRes->opendate($parts[0]);
1850: my $statusAllSame = 1;
1851: my $dueAllSame = 1;
1852: my $openAllSame = 1;
1853: for (my $i = 1; $i < scalar(@parts); $i++) {
1854: if ($curRes->status($parts[$i]) != $status){
1855: $statusAllSame = 0;
1856: }
1857: if ($curRes->duedate($parts[$i]) != $due ) {
1858: $dueAllSame = 0;
1859: }
1860: if ($curRes->opendate($parts[$i]) != $open) {
1861: $openAllSame = 0;
1862: }
1863: }
1864: # $*allSame is true if all the statuses were
1865: # the same. Now, if they are all the same and
1866: # match one of the statuses to condense, or they
1867: # are all open with the same due date, or they are
1868: # all OPEN_LATER with the same open date, display the
1869: # status of the first non-zero part (to get the 'correct'
1870: # status right, since 0 is never 'correct' or 'open').
1871: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1872: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1873: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1874: @parts = ($parts[0]);
1875: $args->{'condensed'} = 1;
1876: }
1877: }
1878: # Multipart problem with one part: always "condense" (happens
1879: # to match the desirable behavior)
1880: if ($curRes->countParts() == 1) {
1881: @parts = ($parts[0]);
1882: $args->{'condensed'} = 1;
1883: }
1884: }
1885: }
1886:
1887: # If the multipart problem was condensed, "forget" it was multipart
1888: if (scalar(@parts) == 1) {
1889: $args->{'multipart'} = 0;
1890: } else {
1891: # Add part 0 so we display it correctly.
1892: unshift @parts, '0';
1893: }
1894:
1895: {
1896: my ($src,$symb,$anchor,$stack);
1897: if ($args->{'sort'}) {
1898: my $it = $navmap->getIterator(undef, undef, undef, 1);
1899: while ( my $res=$it->next()) {
1900: if (ref($res) &&
1901: $res->symb() eq $curRes->symb()) { last; }
1902: }
1903: $stack=$it->getStack();
1904: } else {
1905: $stack=$it->getStack();
1906: }
1907: ($src,$symb,$anchor)=getLinkForResource($stack);
1908: if (defined($anchor)) { $anchor='#'.$anchor; }
1909: my $srcHasQuestion = $src =~ /\?/;
1910: $args->{"resourceLink"} = $src.
1911: ($srcHasQuestion?'&':'?') .
1912: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1913: }
1914: # Now, we've decided what parts to show. Loop through them and
1915: # show them.
1916: foreach my $part (@parts) {
1917: $rownum ++;
1918: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1919:
1920: $result .= " <tr bgcolor='$backgroundColor'>\n";
1921:
1922: # Set up some data about the parts that the cols might want
1923: my $filter = $it->{FILTER};
1924:
1925: # Now, display each column.
1926: foreach my $col (@$cols) {
1927: my $colHTML = '';
1928: if (ref($col)) {
1929: $colHTML .= &$col($curRes, $part, $args);
1930: } else {
1931: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1932: }
1933:
1934: # If this is the first column and it's time to print
1935: # the anchor, do so
1936: if ($col == $cols->[0] &&
1937: $args->{'counter'} == $args->{'currentJumpIndex'} -
1938: $currentJumpDelta) {
1939: # Jam the anchor after the <td> tag;
1940: # necessary for valid HTML (which Mozilla requires)
1941: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1942: $displayedJumpMarker = 1;
1943: }
1944: $result .= $colHTML . "\n";
1945: }
1946: $result .= " </tr>\n";
1947: $args->{'isNewBranch'} = 0;
1948: }
1949:
1950: if ($r && $rownum % 20 == 0) {
1951: $r->print($result);
1952: $result = "";
1953: $r->rflush();
1954: }
1955: } continue {
1956: if ($r) {
1957: # If we have the connection, make sure the user is still connected
1958: my $c = $r->connection;
1959: if ($c->aborted()) {
1960: # Who cares what we do, nobody will see it anyhow.
1961: return '';
1962: }
1963: }
1964: }
1965:
1966: # Print out the part that jumps to #curloc if it exists
1967: # delay needed because the browser is processing the jump before
1968: # it finishes rendering, so it goes to the wrong place!
1969: # onload might be better, but this routine has no access to that.
1970: # On mozilla, the 0-millisecond timeout seems to prevent this;
1971: # it's quite likely this might fix other browsers, too, and
1972: # certainly won't hurt anything.
1973: if ($displayedJumpMarker) {
1974: $result .= "
1975: <script>
1976: if (location.href.indexOf('#curloc')==-1) {
1977: setTimeout(\"location += '#curloc';\", 0)
1978: }
1979: </script>";
1980: }
1981:
1982: $result .= "</table>";
1983:
1984: if ($r) {
1985: $r->print($result);
1986: $result = "";
1987: $r->rflush();
1988: }
1989:
1990: return $result;
1991: }
1992:
1993: sub add_linkitem {
1994: my ($linkitems,$name,$cmd,$text)=@_;
1995: $$linkitems{$name}{'cmd'}=$cmd;
1996: $$linkitems{$name}{'text'}=&mt($text);
1997: }
1998:
1999: sub show_linkitems {
2000: my ($linkitems)=@_;
2001: my @linkorder = ("blank","launchnav","closenav","firsthomework",
2002: "everything","uncompleted","changefolder","clearbubbles");
2003:
2004: my $result .= (<<ENDBLOCK);
2005: <td align="left">
2006: <script type="text/javascript">
2007: function changeNavDisplay () {
2008: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
2009: ENDBLOCK
2010: foreach my $link (@linkorder) {
2011: $result.= "if (navchoice == '$link') {".
2012: $linkitems->{$link}{'cmd'}."}\n";
2013: }
2014: $result.='}
2015: </script>
2016: <form name="linkitems" method="post">
2017: <nobr><select name="toplink">'."\n";
2018: foreach my $link (@linkorder) {
2019: if (defined($linkitems->{$link})) {
2020: if ($linkitems->{$link}{'text'} ne '') {
2021: $result .= ' <option value="'.$link.'">'.
2022: $linkitems->{$link}{'text'}."</option>\n";
2023: }
2024: }
2025: }
2026: $result .= '</select> <input type="button" name="chgnav"
2027: value="Go" onClick="javascript:changeNavDisplay()" />
2028: </nobr></form></td>'."\n";
2029:
2030: return $result;
2031: }
2032:
2033: 1;
2034:
2035: package Apache::lonnavmaps::navmap;
2036:
2037: =pod
2038:
2039: =head1 Object: Apache::lonnavmaps::navmap
2040:
2041: =head2 Overview
2042:
2043: The navmap object's job is to provide access to the resources
2044: in the course as Apache::lonnavmaps::resource objects, and to
2045: query and manage the relationship between those resource objects.
2046:
2047: Generally, you'll use the navmap object in one of three basic ways.
2048: In order of increasing complexity and power:
2049:
2050: =over 4
2051:
2052: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2053: various ways to obtain resource objects, based on various identifiers.
2054: Use this when you want to request information about one object or
2055: a handful of resources you already know the identities of, from some
2056: other source. For more about Ids, Symbs, and MapPcs, see the
2057: Resource documentation. Note that Url should be a B<last resort>,
2058: not your first choice; it only works when there is only one
2059: instance of the resource in the course, which only applies to
2060: maps, and even that may change in the future.
2061:
2062: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2063: retrieves resources matching some criterion and returns them
2064: in a flat array, with no structure information. Use this when
2065: you are manipulating a series of resources, based on what map
2066: the are in, but do not care about branching, or exactly how
2067: the maps and resources are related. This is the most common case.
2068:
2069: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2070: the course's navmap in various ways without writing the traversal
2071: code yourself. See iterator documentation below. Use this when
2072: you need to know absolutely everything about the course, including
2073: branches and the precise relationship between maps and resources.
2074:
2075: =back
2076:
2077: =head2 Creation And Destruction
2078:
2079: To create a navmap object, use the following function:
2080:
2081: =over 4
2082:
2083: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2084:
2085: Creates a new navmap object. Returns the navmap object if this is
2086: successful, or B<undef> if not.
2087:
2088: =back
2089:
2090: =head2 Methods
2091:
2092: =over 4
2093:
2094: =item * B<getIterator>(first, finish, filter, condition):
2095:
2096: See iterator documentation below.
2097:
2098: =cut
2099:
2100: use strict;
2101: use GDBM_File;
2102: use Apache::lonnet;
2103:
2104: sub new {
2105: # magic invocation to create a class instance
2106: my $proto = shift;
2107: my $class = ref($proto) || $proto;
2108: my $self = {};
2109:
2110: # Resource cache stores navmap resources as we reference them. We generate
2111: # them on-demand so we don't pay for creating resources unless we use them.
2112: $self->{RESOURCE_CACHE} = {};
2113:
2114: # Network failure flag, if we accessed the course or user opt and
2115: # failed
2116: $self->{NETWORK_FAILURE} = 0;
2117:
2118: # tie the nav hash
2119:
2120: my %navmaphash;
2121: my %parmhash;
2122: my $courseFn = $env{"request.course.fn"};
2123: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2124: &GDBM_READER(), 0640))) {
2125: return undef;
2126: }
2127:
2128: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2129: &GDBM_READER(), 0640)))
2130: {
2131: untie %{$self->{PARM_HASH}};
2132: return undef;
2133: }
2134:
2135: $self->{NAV_HASH} = \%navmaphash;
2136: $self->{PARM_HASH} = \%parmhash;
2137: $self->{PARM_CACHE} = {};
2138:
2139: bless($self);
2140:
2141: return $self;
2142: }
2143:
2144: sub generate_course_user_opt {
2145: my $self = shift;
2146: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2147:
2148: my $uname=$env{'user.name'};
2149: my $udom=$env{'user.domain'};
2150: my $cid=$env{'request.course.id'};
2151: my $cdom=$env{'course.'.$cid.'.domain'};
2152: my $cnum=$env{'course.'.$cid.'.num'};
2153:
2154: # ------------------------------------------------- Get coursedata (if present)
2155: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2156: # Check for network failure
2157: if (!ref($courseopt)) {
2158: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2159: $self->{NETWORK_FAILURE} = 1;
2160: }
2161: undef($courseopt);
2162: }
2163:
2164: # --------------------------------------------------- Get userdata (if present)
2165:
2166: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2167: # Check for network failure
2168: if (!ref($useropt)) {
2169: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2170: $self->{NETWORK_FAILURE} = 1;
2171: }
2172: undef($useropt);
2173: }
2174:
2175: $self->{COURSE_OPT} = $courseopt;
2176: $self->{USER_OPT} = $useropt;
2177:
2178: $self->{COURSE_USER_OPT_GENERATED} = 1;
2179:
2180: return;
2181: }
2182:
2183: sub generate_email_discuss_status {
2184: my $self = shift;
2185: my $symb = shift;
2186: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2187:
2188: my $cid=$env{'request.course.id'};
2189: my $cdom=$env{'course.'.$cid.'.domain'};
2190: my $cnum=$env{'course.'.$cid.'.num'};
2191:
2192: my %emailstatus = &Apache::lonnet::dump('email_status');
2193: my $logoutTime = $emailstatus{'logout'};
2194: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2195: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2196: $courseLeaveTime : $logoutTime);
2197: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2198: $cdom, $cnum);
2199: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2200: $env{'user.domain'},$env{'user.name'},'lastread');
2201: my %lastreadtime = ();
2202: foreach (keys %lastread) {
2203: my $key = $_;
2204: $key =~ s/_lastread$//;
2205: $lastreadtime{$key} = $lastread{$_};
2206: }
2207:
2208: my %feedback=();
2209: my %error=();
2210: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2211: $env{'user.name'});
2212:
2213: foreach my $msgid (@keys) {
2214: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2215: my $plain=
2216: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2217: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2218: my ($what,$url)=($1,$2);
2219: if ($what eq 'Error') {
2220: $error{$url}.=','.$msgid;
2221: } else {
2222: $feedback{$url}.=','.$msgid;
2223: }
2224: }
2225: }
2226: }
2227:
2228: #url's of resources that have feedbacks
2229: $self->{FEEDBACK} = \%feedback;
2230: #or errors
2231: $self->{ERROR_MSG} = \%error;
2232: $self->{DISCUSSION_TIME} = \%discussiontime;
2233: $self->{EMAIL_STATUS} = \%emailstatus;
2234: $self->{LAST_READ} = \%lastreadtime;
2235:
2236: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2237: }
2238:
2239: sub get_user_data {
2240: my $self = shift;
2241: if ($self->{RETRIEVED_USER_DATA}) { return; }
2242:
2243: # Retrieve performance data on problems
2244: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2245: $env{'user.domain'},
2246: $env{'user.name'});
2247: $self->{STUDENT_DATA} = \%student_data;
2248:
2249: $self->{RETRIEVED_USER_DATA} = 1;
2250: }
2251:
2252: # Internal function: Takes a key to look up in the nav hash and implements internal
2253: # memory caching of that key.
2254: sub navhash {
2255: my $self = shift; my $key = shift;
2256: return $self->{NAV_HASH}->{$key};
2257: }
2258:
2259: =pod
2260:
2261: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2262: false otherwise. Undefined course maps indicate an error somewhere in
2263: LON-CAPA, and you will not be able to proceed with using the navmap.
2264: See the B<NAV> screen for an example of using this.
2265:
2266: =cut
2267:
2268: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2269: sub courseMapDefined {
2270: my $self = shift;
2271: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2272:
2273: my $firstres = $self->navhash("map_start_$uri");
2274: my $lastres = $self->navhash("map_finish_$uri");
2275: return $firstres && $lastres;
2276: }
2277:
2278: sub getIterator {
2279: my $self = shift;
2280: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2281: shift, undef, shift,
2282: shift, shift);
2283: return $iterator;
2284: }
2285:
2286: # Private method: Does the given resource (as a symb string) have
2287: # current discussion? Returns 0 if chat/mail data not extracted.
2288: sub hasDiscussion {
2289: my $self = shift;
2290: my $symb = shift;
2291: $self->generate_email_discuss_status();
2292:
2293: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2294:
2295: #return defined($self->{DISCUSSION_TIME}->{$symb});
2296:
2297: # backward compatibility (bulletin boards used to be 'wrapped')
2298: my $ressymb = $self->wrap_symb($symb);
2299: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2300: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2301: } else {
2302: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2303: 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).
2304: }
2305: }
2306:
2307: sub wrap_symb {
2308: my $self = shift;
2309: my $symb = shift;
2310: if ($symb =~ m-___(adm/\w+/\w+/)(\d+)(/bulletinboard)$-) {
2311: unless ($symb =~ m|adm/wrapper/adm|) {
2312: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2313: }
2314: }
2315: return $symb;
2316: }
2317:
2318: # Private method: Does the given resource (as a symb string) have
2319: # current feedback? Returns the string in the feedback hash, which
2320: # will be false if it does not exist.
2321:
2322: sub getFeedback {
2323: my $self = shift;
2324: my $symb = shift;
2325:
2326: $self->generate_email_discuss_status();
2327:
2328: if (!defined($self->{FEEDBACK})) { return ""; }
2329:
2330: return $self->{FEEDBACK}->{$symb};
2331: }
2332:
2333: # Private method: Get the errors for that resource (by source).
2334: sub getErrors {
2335: my $self = shift;
2336: my $src = shift;
2337:
2338: $self->generate_email_discuss_status();
2339:
2340: if (!defined($self->{ERROR_MSG})) { return ""; }
2341: return $self->{ERROR_MSG}->{$src};
2342: }
2343:
2344: =pod
2345:
2346: =item * B<getById>(id):
2347:
2348: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2349: object for that resource. This method, or other methods that use it
2350: (as in the resource object) is the only proper way to obtain a
2351: resource object.
2352:
2353: =item * B<getBySymb>(symb):
2354:
2355: Based on the symb of the resource, get a resource object for that
2356: resource. This is one of the proper ways to get a resource object.
2357:
2358: =item * B<getMapByMapPc>(map_pc):
2359:
2360: Based on the map_pc of the resource, get a resource object for
2361: the given map. This is one of the proper ways to get a resource object.
2362:
2363: =cut
2364:
2365: # The strategy here is to cache the resource objects, and only construct them
2366: # as we use them. The real point is to prevent reading any more from the tied
2367: # hash then we have to, which should hopefully alleviate speed problems.
2368:
2369: sub getById {
2370: my $self = shift;
2371: my $id = shift;
2372:
2373: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2374: {
2375: return $self->{RESOURCE_CACHE}->{$id};
2376: }
2377:
2378: # resource handles inserting itself into cache.
2379: # Not clear why the quotes are necessary, but as of this
2380: # writing it doesn't work without them.
2381: return "Apache::lonnavmaps::resource"->new($self, $id);
2382: }
2383:
2384: sub getBySymb {
2385: my $self = shift;
2386: my $symb = shift;
2387:
2388: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2389: my $map = $self->getResourceByUrl($mapUrl);
2390: my $returnvalue = undef;
2391: if (ref($map)) {
2392: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2393: }
2394: return $returnvalue;
2395: }
2396:
2397: sub getByMapPc {
2398: my $self = shift;
2399: my $map_pc = shift;
2400: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2401: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2402: return $self->getById($map_id);
2403: }
2404:
2405: =pod
2406:
2407: =item * B<firstResource>():
2408:
2409: Returns a resource object reference corresponding to the first
2410: resource in the navmap.
2411:
2412: =cut
2413:
2414: sub firstResource {
2415: my $self = shift;
2416: my $firstResource = $self->navhash('map_start_' .
2417: &Apache::lonnet::clutter($env{'request.course.uri'}));
2418: return $self->getById($firstResource);
2419: }
2420:
2421: =pod
2422:
2423: =item * B<finishResource>():
2424:
2425: Returns a resource object reference corresponding to the last resource
2426: in the navmap.
2427:
2428: =cut
2429:
2430: sub finishResource {
2431: my $self = shift;
2432: my $firstResource = $self->navhash('map_finish_' .
2433: &Apache::lonnet::clutter($env{'request.course.uri'}));
2434: return $self->getById($firstResource);
2435: }
2436:
2437: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2438: # the actual lookup; parmval caches the results.
2439: sub parmval {
2440: my $self = shift;
2441: my ($what,$symb)=@_;
2442: my $hashkey = $what."|||".$symb;
2443:
2444: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2445: return $self->{PARM_CACHE}->{$hashkey};
2446: }
2447:
2448: my $result = $self->parmval_real($what, $symb);
2449: $self->{PARM_CACHE}->{$hashkey} = $result;
2450: return $result;
2451: }
2452:
2453: sub parmval_real {
2454: my $self = shift;
2455: my ($what,$symb,$recurse) = @_;
2456:
2457: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2458: $self->generate_course_user_opt();
2459:
2460: my $cid=$env{'request.course.id'};
2461: my $csec=$env{'request.course.sec'};
2462: my $uname=$env{'user.name'};
2463: my $udom=$env{'user.domain'};
2464:
2465: unless ($symb) { return ''; }
2466: my $result='';
2467:
2468: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2469:
2470: # ----------------------------------------------------- Cascading lookup scheme
2471: my $rwhat=$what;
2472: $what=~s/^parameter\_//;
2473: $what=~s/\_/\./;
2474:
2475: my $symbparm=$symb.'.'.$what;
2476: my $mapparm=$mapname.'___(all).'.$what;
2477: my $usercourseprefix=$cid;
2478:
2479: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2480: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2481: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2482:
2483: my $courselevel= $usercourseprefix.'.'.$what;
2484: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2485: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2486:
2487: my $useropt = $self->{USER_OPT};
2488: my $courseopt = $self->{COURSE_OPT};
2489: my $parmhash = $self->{PARM_HASH};
2490:
2491: # ---------------------------------------------------------- first, check user
2492: if ($uname and defined($useropt)) {
2493: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2494: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2495: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2496: }
2497:
2498: # ------------------------------------------------------- second, check course
2499: if ($csec and defined($courseopt)) {
2500: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2501: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2502: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2503: }
2504:
2505: if (defined($courseopt)) {
2506: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2507: }
2508:
2509: # ----------------------------------------------------- third, check map parms
2510:
2511: my $thisparm=$$parmhash{$symbparm};
2512: if (defined($thisparm)) { return $thisparm; }
2513:
2514: # ----------------------------------------------------- fourth , check default
2515:
2516: my $meta_rwhat=$rwhat;
2517: $meta_rwhat=~s/\./_/g;
2518: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2519: if (defined($default)) { return $default}
2520: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2521: if (defined($default)) { return $default}
2522:
2523: # --------------------------------------------------- fifth, check more course
2524: if (defined($courseopt)) {
2525: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2526: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2527: }
2528:
2529: # --------------------------------------------------- sixth , cascade up parts
2530:
2531: my ($space,@qualifier)=split(/\./,$rwhat);
2532: my $qualifier=join('.',@qualifier);
2533: unless ($space eq '0') {
2534: my @parts=split(/_/,$space);
2535: my $id=pop(@parts);
2536: my $part=join('_',@parts);
2537: if ($part eq '') { $part='0'; }
2538: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2539: if (defined($partgeneral)) { return $partgeneral; }
2540: }
2541: if ($recurse) { return undef; }
2542: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2543: if (defined($pack_def)) { return $pack_def; }
2544: return '';
2545: }
2546:
2547: =pod
2548:
2549: =item * B<getResourceByUrl>(url):
2550:
2551: Retrieves a resource object by URL of the resource. If passed a
2552: resource object, it will simply return it, so it is safe to use this
2553: method in code like "$res = $navmap->getResourceByUrl($res)", if
2554: you're not sure if $res is already an object, or just a URL. If the
2555: resource appears multiple times in the course, only the first instance
2556: will be returned. As a result, this is probably useful only for maps.
2557:
2558: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2559:
2560: The map is a specification of a map to retreive the resources from,
2561: either as a url or as an object. The filterFunc is a reference to a
2562: function that takes a resource object as its one argument and returns
2563: true if the resource should be included, or false if it should not
2564: be. If recursive is true, the map will be recursively examined,
2565: otherwise it will not be. If bailout is true, the function will return
2566: as soon as it finds a resource, if false it will finish. If showall is
2567: true it will not hide maps that contain nothing but one other map. By
2568: default, the map is the top-level map of the course, filterFunc is a
2569: function that always returns 1, recursive is true, bailout is false,
2570: showall is false. The resources will be returned in a list containing
2571: the resource objects for the corresponding resources, with B<no
2572: structure information> in the list; regardless of branching,
2573: recursion, etc., it will be a flat list.
2574:
2575: Thus, this is suitable for cases where you don't want the structure,
2576: just a list of all resources. It is also suitable for finding out how
2577: many resources match a given description; for this use, if all you
2578: want to know is if I<any> resources match the description, the bailout
2579: parameter will allow you to avoid potentially expensive enumeration of
2580: all matching resources.
2581:
2582: =item * B<hasResource>(map, filterFunc, recursive, showall):
2583:
2584: Convience method for
2585:
2586: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2587:
2588: which will tell whether the map has resources matching the description
2589: in the filter function.
2590:
2591: =cut
2592:
2593:
2594: sub getResourceByUrl {
2595: my $self = shift;
2596: my $resUrl = shift;
2597:
2598: if (ref($resUrl)) { return $resUrl; }
2599:
2600: $resUrl = &Apache::lonnet::clutter($resUrl);
2601: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2602: if ($resId =~ /,/) {
2603: $resId = (split (/,/, $resId))[0];
2604: }
2605: if (!$resId) { return ''; }
2606: return $self->getById($resId);
2607: }
2608:
2609: sub retrieveResources {
2610: my $self = shift;
2611: my $map = shift;
2612: my $filterFunc = shift;
2613: if (!defined ($filterFunc)) {
2614: $filterFunc = sub {return 1;};
2615: }
2616: my $recursive = shift;
2617: if (!defined($recursive)) { $recursive = 1; }
2618: my $bailout = shift;
2619: if (!defined($bailout)) { $bailout = 0; }
2620: my $showall = shift;
2621: # Create the necessary iterator.
2622: if (!ref($map)) { # assume it's a url of a map.
2623: $map = $self->getResourceByUrl($map);
2624: }
2625:
2626: # If nothing was passed, assume top-level map
2627: if (!$map) {
2628: $map = $self->getById('0.0');
2629: }
2630:
2631: # Check the map's validity.
2632: if (!$map->is_map()) {
2633: # Oh, to throw an exception.... how I'd love that!
2634: return ();
2635: }
2636:
2637: # Get an iterator.
2638: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2639: undef, $recursive, $showall);
2640:
2641: my @resources = ();
2642:
2643: # Run down the iterator and collect the resources.
2644: my $curRes;
2645:
2646: while ($curRes = $it->next()) {
2647: if (ref($curRes)) {
2648: if (!&$filterFunc($curRes)) {
2649: next;
2650: }
2651:
2652: push @resources, $curRes;
2653:
2654: if ($bailout) {
2655: return @resources;
2656: }
2657: }
2658:
2659: }
2660:
2661: return @resources;
2662: }
2663:
2664: sub hasResource {
2665: my $self = shift;
2666: my $map = shift;
2667: my $filterFunc = shift;
2668: my $recursive = shift;
2669: my $showall = shift;
2670:
2671: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2672: }
2673:
2674: 1;
2675:
2676: package Apache::lonnavmaps::iterator;
2677: use WeakRef;
2678: use Apache::lonnet;
2679:
2680: =pod
2681:
2682: =back
2683:
2684: =head1 Object: navmap Iterator
2685:
2686: An I<iterator> encapsulates the logic required to traverse a data
2687: structure. navmap uses an iterator to traverse the course map
2688: according to the criteria you wish to use.
2689:
2690: To obtain an iterator, call the B<getIterator>() function of a
2691: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2692: directly.) This will return a reference to the iterator:
2693:
2694: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2695:
2696: To get the next thing from the iterator, call B<next>:
2697:
2698: C<my $nextThing = $resourceIterator-E<gt>next()>
2699:
2700: getIterator behaves as follows:
2701:
2702: =over 4
2703:
2704: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2705:
2706: All parameters are optional. firstResource is a resource reference
2707: corresponding to where the iterator should start. It defaults to
2708: navmap->firstResource() for the corresponding nav map. finishResource
2709: corresponds to where you want the iterator to end, defaulting to
2710: navmap->finishResource(). filterHash is a hash used as a set
2711: containing strings representing the resource IDs, defaulting to
2712: empty. Condition is a 1 or 0 that sets what to do with the filter
2713: hash: If a 0, then only resources that exist IN the filterHash will be
2714: recursed on. If it is a 1, only resources NOT in the filterHash will
2715: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2716: false (default), the iterator will only return the first level of map
2717: that is not just a single, 'redirecting' map. If true, the iterator
2718: will return all information, starting with the top-level map,
2719: regardless of content. returnTopMap, if true (default false), will
2720: cause the iterator to return the top-level map object (resource 0.0)
2721: before anything else.
2722:
2723: Thus, by default, only top-level resources will be shown. Change the
2724: condition to a 1 without changing the hash, and all resources will be
2725: shown. Changing the condition to 1 and including some values in the
2726: hash will allow you to selectively suppress parts of the navmap, while
2727: leaving it on 0 and adding things to the hash will allow you to
2728: selectively add parts of the nav map. See the handler code for
2729: examples.
2730:
2731: The iterator will return either a reference to a resource object, or a
2732: token representing something in the map, such as the beginning of a
2733: new branch. The possible tokens are:
2734:
2735: =over 4
2736:
2737: =item * B<END_ITERATOR>:
2738:
2739: The iterator has returned all that it's going to. Further calls to the
2740: iterator will just produce more of these. This is a "false" value, and
2741: is the only false value the iterator which will be returned, so it can
2742: be used as a loop sentinel.
2743:
2744: =item * B<BEGIN_MAP>:
2745:
2746: A new map is being recursed into. This is returned I<after> the map
2747: resource itself is returned.
2748:
2749: =item * B<END_MAP>:
2750:
2751: The map is now done.
2752:
2753: =item * B<BEGIN_BRANCH>:
2754:
2755: A branch is now starting. The next resource returned will be the first
2756: in that branch.
2757:
2758: =item * B<END_BRANCH>:
2759:
2760: The branch is now done.
2761:
2762: =back
2763:
2764: The tokens are retreivable via methods on the iterator object, i.e.,
2765: $iterator->END_MAP.
2766:
2767: Maps can contain empty resources. The iterator will automatically skip
2768: over such resources, but will still treat the structure
2769: correctly. Thus, a complicated map with several branches, but
2770: consisting entirely of empty resources except for one beginning or
2771: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2772: but only one resource will be returned.
2773:
2774: =back
2775:
2776: =head2 Normal Usage
2777:
2778: Normal usage of the iterator object is to do the following:
2779:
2780: my $it = $navmap->getIterator([your params here]);
2781: my $curRes;
2782: while ($curRes = $it->next()) {
2783: [your logic here]
2784: }
2785:
2786: Note that inside of the loop, it's frequently useful to check if
2787: "$curRes" is a reference or not with the reference function; only
2788: resource objects will be references, and any non-references will
2789: be the tokens described above.
2790:
2791: Also note there is some old code floating around that trys to track
2792: the depth of the iterator to see when it's done; do not copy that
2793: code. It is difficult to get right and harder to understand then
2794: this. They should be migrated to this new style.
2795:
2796: =cut
2797:
2798: # Here are the tokens for the iterator:
2799:
2800: sub END_ITERATOR { return 0; }
2801: sub BEGIN_MAP { return 1; } # begining of a new map
2802: sub END_MAP { return 2; } # end of the map
2803: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2804: sub END_BRANCH { return 4; } # end of a branch
2805: sub FORWARD { return 1; } # go forward
2806: sub BACKWARD { return 2; }
2807:
2808: sub min {
2809: (my $a, my $b) = @_;
2810: if ($a < $b) { return $a; } else { return $b; }
2811: }
2812:
2813: sub new {
2814: # magic invocation to create a class instance
2815: my $proto = shift;
2816: my $class = ref($proto) || $proto;
2817: my $self = {};
2818:
2819: weaken($self->{NAV_MAP} = shift);
2820: return undef unless ($self->{NAV_MAP});
2821:
2822: # Handle the parameters
2823: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2824: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2825:
2826: # If the given resources are just the ID of the resource, get the
2827: # objects
2828: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2829: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2830: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2831: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2832:
2833: $self->{FILTER} = shift;
2834:
2835: # A hash, used as a set, of resource already seen
2836: $self->{ALREADY_SEEN} = shift;
2837: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2838: $self->{CONDITION} = shift;
2839:
2840: # Do we want to automatically follow "redirection" maps?
2841: $self->{FORCE_TOP} = shift;
2842:
2843: # Do we want to return the top-level map object (resource 0.0)?
2844: $self->{RETURN_0} = shift;
2845: # have we done that yet?
2846: $self->{HAVE_RETURNED_0} = 0;
2847:
2848: # Now, we need to pre-process the map, by walking forward and backward
2849: # over the parts of the map we're going to look at.
2850:
2851: # The processing steps are exactly the same, except for a few small
2852: # changes, so I bundle those up in the following list of two elements:
2853: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2854: # first_resource).
2855: # This prevents writing nearly-identical code twice.
2856: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2857: 'FIRST_RESOURCE'],
2858: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2859: 'FINISH_RESOURCE'] );
2860:
2861: my $maxDepth = 0; # tracks max depth
2862:
2863: # If there is only one resource in this map, and it's a map, we
2864: # want to remember that, so the user can ask for the first map
2865: # that isn't just a redirector.
2866: my $resource; my $resourceCount = 0;
2867:
2868: # Documentation on this algorithm can be found in the CVS repository at
2869: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2870: # in that file.
2871: # **1**
2872:
2873: foreach my $pass (@iterations) {
2874: my $direction = $pass->[0];
2875: my $valName = $pass->[1];
2876: my $nextResourceMethod = $pass->[2];
2877: my $firstResourceName = $pass->[3];
2878:
2879: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2880: $self->{FIRST_RESOURCE},
2881: $self->{FINISH_RESOURCE},
2882: {}, undef, 0, $direction);
2883:
2884: # prime the recursion
2885: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2886: $iterator->next();
2887: my $curRes = $iterator->next();
2888: my $depth = 1;
2889: while ($depth > 0) {
2890: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2891: if ($curRes == $iterator->END_MAP()) { $depth--; }
2892:
2893: if (ref($curRes)) {
2894: # If there's only one resource, this will save it
2895: # we have to filter empty resources from consideration here,
2896: # or even "empty", redirecting maps have two (start & finish)
2897: # or three (start, finish, plus redirector)
2898: if($direction == FORWARD && $curRes->src()) {
2899: $resource = $curRes; $resourceCount++;
2900: }
2901: my $resultingVal = $curRes->{DATA}->{$valName};
2902: my $nextResources = $curRes->$nextResourceMethod();
2903: my $nextCount = scalar(@{$nextResources});
2904:
2905: if ($nextCount == 1) { # **3**
2906: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2907: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2908: }
2909:
2910: if ($nextCount > 1) { # **4**
2911: foreach my $res (@{$nextResources}) {
2912: my $current = $res->{DATA}->{$valName} || 999999999;
2913: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2914: }
2915: }
2916: }
2917:
2918: # Assign the final val (**2**)
2919: if (ref($curRes) && $direction == BACKWARD()) {
2920: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2921: $curRes->{DATA}->{BOT_UP_VAL});
2922:
2923: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2924: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2925: }
2926:
2927: $curRes = $iterator->next();
2928: }
2929: }
2930:
2931: # Check: Was this only one resource, a map?
2932: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2933: my $firstResource = $resource->map_start();
2934: my $finishResource = $resource->map_finish();
2935: return
2936: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2937: $finishResource, $self->{FILTER},
2938: $self->{ALREADY_SEEN},
2939: $self->{CONDITION},
2940: $self->{FORCE_TOP});
2941:
2942: }
2943:
2944: # Set up some bookkeeping information.
2945: $self->{CURRENT_DEPTH} = 0;
2946: $self->{MAX_DEPTH} = $maxDepth;
2947: $self->{STACK} = [];
2948: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2949: $self->{FINISHED} = 0; # When true, the iterator has finished
2950:
2951: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2952: push @{$self->{STACK}}, [];
2953: }
2954:
2955: # Prime the recursion w/ the first resource **5**
2956: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2957: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2958:
2959: bless ($self);
2960:
2961: return $self;
2962: }
2963:
2964: sub next {
2965: my $self = shift;
2966: my $closeAllPages=shift;
2967: if ($self->{FINISHED}) {
2968: return END_ITERATOR();
2969: }
2970:
2971: # If we want to return the top-level map object, and haven't yet,
2972: # do so.
2973: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2974: $self->{HAVE_RETURNED_0} = 1;
2975: return $self->{NAV_MAP}->getById('0.0');
2976: }
2977:
2978: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2979: # grab the next from the recursive iterator
2980: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2981:
2982: # is it a begin or end map? If so, update the depth
2983: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2984: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2985:
2986: # Are we back at depth 0? If so, stop recursing
2987: if ($self->{RECURSIVE_DEPTH} == 0) {
2988: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2989: }
2990:
2991: return $next;
2992: }
2993:
2994: if (defined($self->{FORCE_NEXT})) {
2995: my $tmp = $self->{FORCE_NEXT};
2996: $self->{FORCE_NEXT} = undef;
2997: return $tmp;
2998: }
2999:
3000: # Have we not yet begun? If not, return BEGIN_MAP and
3001: # remember we've started.
3002: if ( !$self->{STARTED} ) {
3003: $self->{STARTED} = 1;
3004: return $self->BEGIN_MAP();
3005: }
3006:
3007: # Here's the guts of the iterator.
3008:
3009: # Find the next resource, if any.
3010: my $found = 0;
3011: my $i = $self->{MAX_DEPTH};
3012: my $newDepth;
3013: my $here;
3014: while ( $i >= 0 && !$found ) {
3015: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3016: $here = pop @{$self->{STACK}->[$i]}; # **7**
3017: $found = 1;
3018: $newDepth = $i;
3019: }
3020: $i--;
3021: }
3022:
3023: # If we still didn't find anything, we're done.
3024: if ( !$found ) {
3025: # We need to get back down to the correct branch depth
3026: if ( $self->{CURRENT_DEPTH} > 0 ) {
3027: $self->{CURRENT_DEPTH}--;
3028: return END_BRANCH();
3029: } else {
3030: $self->{FINISHED} = 1;
3031: return END_MAP();
3032: }
3033: }
3034:
3035: # If this is not a resource, it must be an END_BRANCH marker we want
3036: # to return directly.
3037: if (!ref($here)) { # **8**
3038: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3039: $self->{CURRENT_DEPTH}--;
3040: return $here;
3041: }
3042: }
3043:
3044: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3045: $self->{HERE} = $here;
3046:
3047: # Get to the right level
3048: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3049: push @{$self->{STACK}->[$newDepth]}, $here;
3050: $self->{CURRENT_DEPTH}--;
3051: return END_BRANCH();
3052: }
3053: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3054: push @{$self->{STACK}->[$newDepth]}, $here;
3055: $self->{CURRENT_DEPTH}++;
3056: return BEGIN_BRANCH();
3057: }
3058:
3059: # If we made it here, we have the next resource, and we're at the
3060: # right branch level. So let's examine the resource for where
3061: # we can get to from here.
3062:
3063: # So we need to look at all the resources we can get to from here,
3064: # categorize them if we haven't seen them, remember if we have a new
3065: my $nextUnfiltered = $here->getNext();
3066: my $maxDepthAdded = -1;
3067:
3068: for (@$nextUnfiltered) {
3069: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3070: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3071: push @{$self->{STACK}->[$depth]}, $_;
3072: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3073: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3074: }
3075: }
3076:
3077: # Is this the end of a branch? If so, all of the resources examined above
3078: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3079: # marker onto the stack so we don't forget.
3080: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3081: # BC branch and gets to C, it will see F as the only next resource, but it's
3082: # one level lower. Thus, this is the end of the branch, since there are no
3083: # more resources added to this level or above.
3084: # We don't do this if the examined resource is the finish resource,
3085: # because the condition given above is true, but the "END_MAP" will
3086: # take care of things and we should already be at depth 0.
3087: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3088: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3089: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3090: }
3091:
3092: # That ends the main iterator logic. Now, do we want to recurse
3093: # down this map (if this resource is a map)?
3094: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3095: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3096: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3097: my $firstResource = $self->{HERE}->map_start();
3098: my $finishResource = $self->{HERE}->map_finish();
3099:
3100: $self->{RECURSIVE_ITERATOR} =
3101: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3102: $finishResource, $self->{FILTER},
3103: $self->{ALREADY_SEEN},
3104: $self->{CONDITION},
3105: $self->{FORCE_TOP});
3106: }
3107:
3108: # If this is a blank resource, don't actually return it.
3109: # Should you ever find you need it, make sure to add an option to the code
3110: # that you can use; other things depend on this behavior.
3111: my $browsePriv = $self->{HERE}->browsePriv();
3112: if (!$self->{HERE}->src() ||
3113: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3114: return $self->next($closeAllPages);
3115: }
3116:
3117: return $self->{HERE};
3118:
3119: }
3120:
3121: =pod
3122:
3123: The other method available on the iterator is B<getStack>, which
3124: returns an array populated with the current 'stack' of maps, as
3125: references to the resource objects. Example: This is useful when
3126: making the navigation map, as we need to check whether we are under a
3127: page map to see if we need to link directly to the resource, or to the
3128: page. The first elements in the array will correspond to the top of
3129: the stack (most inclusive map).
3130:
3131: =cut
3132:
3133: sub getStack {
3134: my $self=shift;
3135:
3136: my @stack;
3137:
3138: $self->populateStack(\@stack);
3139:
3140: return \@stack;
3141: }
3142:
3143: # Private method: Calls the iterators recursively to populate the stack.
3144: sub populateStack {
3145: my $self=shift;
3146: my $stack = shift;
3147:
3148: push @$stack, $self->{HERE} if ($self->{HERE});
3149:
3150: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3151: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3152: }
3153: }
3154:
3155: 1;
3156:
3157: package Apache::lonnavmaps::DFSiterator;
3158: use WeakRef;
3159: use Apache::lonnet;
3160:
3161: # Not documented in the perldoc: This is a simple iterator that just walks
3162: # through the nav map and presents the resources in a depth-first search
3163: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3164: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3165: # useful for pre-processing of some kind, and is in fact used by the main
3166: # iterator that way, but that's about it.
3167: # One could imagine merging this into the init routine of the main iterator,
3168: # but this might as well be left separate, since it is possible some other
3169: # use might be found for it. - Jeremy
3170:
3171: # Unlike the main iterator, this DOES return all resources, even blank ones.
3172: # The main iterator needs them to correctly preprocess the map.
3173:
3174: sub BEGIN_MAP { return 1; } # begining of a new map
3175: sub END_MAP { return 2; } # end of the map
3176: sub FORWARD { return 1; } # go forward
3177: sub BACKWARD { return 2; }
3178:
3179: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3180: # filter hash ref (or undef), already seen hash or undef, condition
3181: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3182: sub new {
3183: # magic invocation to create a class instance
3184: my $proto = shift;
3185: my $class = ref($proto) || $proto;
3186: my $self = {};
3187:
3188: weaken($self->{NAV_MAP} = shift);
3189: return undef unless ($self->{NAV_MAP});
3190:
3191: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3192: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3193:
3194: # If the given resources are just the ID of the resource, get the
3195: # objects
3196: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3197: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3198: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3199: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3200:
3201: $self->{FILTER} = shift;
3202:
3203: # A hash, used as a set, of resource already seen
3204: $self->{ALREADY_SEEN} = shift;
3205: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3206: $self->{CONDITION} = shift;
3207: $self->{DIRECTION} = shift || FORWARD();
3208:
3209: # Flag: Have we started yet?
3210: $self->{STARTED} = 0;
3211:
3212: # Should we continue calling the recursive iterator, if any?
3213: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3214: # The recursive iterator, if any
3215: $self->{RECURSIVE_ITERATOR} = undef;
3216: # Are we recursing on a map, or a branch?
3217: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3218: # And the count of how deep it is, so that this iterator can keep track of
3219: # when to pick back up again.
3220: $self->{RECURSIVE_DEPTH} = 0;
3221:
3222: # For keeping track of our branches, we maintain our own stack
3223: $self->{STACK} = [];
3224:
3225: # Start with the first resource
3226: if ($self->{DIRECTION} == FORWARD) {
3227: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3228: } else {
3229: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3230: }
3231:
3232: bless($self);
3233: return $self;
3234: }
3235:
3236: sub next {
3237: my $self = shift;
3238:
3239: # Are we using a recursive iterator? If so, pull from that and
3240: # watch the depth; we want to resume our level at the correct time.
3241: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3242: # grab the next from the recursive iterator
3243: my $next = $self->{RECURSIVE_ITERATOR}->next();
3244:
3245: # is it a begin or end map? Update depth if so
3246: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3247: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3248:
3249: # Are we back at depth 0? If so, stop recursing.
3250: if ($self->{RECURSIVE_DEPTH} == 0) {
3251: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3252: }
3253:
3254: return $next;
3255: }
3256:
3257: # Is there a current resource to grab? If not, then return
3258: # END_MAP, which will end the iterator.
3259: if (scalar(@{$self->{STACK}}) == 0) {
3260: return $self->END_MAP();
3261: }
3262:
3263: # Have we not yet begun? If not, return BEGIN_MAP and
3264: # remember that we've started.
3265: if ( !$self->{STARTED} ) {
3266: $self->{STARTED} = 1;
3267: return $self->BEGIN_MAP;
3268: }
3269:
3270: # Get the next resource in the branch
3271: $self->{HERE} = pop @{$self->{STACK}};
3272:
3273: # remember that we've seen this, so we don't return it again later
3274: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3275:
3276: # Get the next possible resources
3277: my $nextUnfiltered;
3278: if ($self->{DIRECTION} == FORWARD()) {
3279: $nextUnfiltered = $self->{HERE}->getNext();
3280: } else {
3281: $nextUnfiltered = $self->{HERE}->getPrevious();
3282: }
3283: my $next = [];
3284:
3285: # filter the next possibilities to remove things we've
3286: # already seen.
3287: foreach (@$nextUnfiltered) {
3288: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3289: push @$next, $_;
3290: }
3291: }
3292:
3293: while (@$next) {
3294: # copy the next possibilities over to the stack
3295: push @{$self->{STACK}}, shift @$next;
3296: }
3297:
3298: # If this is a map and we want to recurse down it... (not filtered out)
3299: if ($self->{HERE}->is_map() &&
3300: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3301: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3302: my $firstResource = $self->{HERE}->map_start();
3303: my $finishResource = $self->{HERE}->map_finish();
3304:
3305: $self->{RECURSIVE_ITERATOR} =
3306: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3307: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3308: $self->{CONDITION}, $self->{DIRECTION});
3309: }
3310:
3311: return $self->{HERE};
3312: }
3313:
3314: # Identical to the full iterator methods of the same name. Hate to copy/paste
3315: # but I also hate to "inherit" either iterator from the other.
3316:
3317: sub getStack {
3318: my $self=shift;
3319:
3320: my @stack;
3321:
3322: $self->populateStack(\@stack);
3323:
3324: return \@stack;
3325: }
3326:
3327: # Private method: Calls the iterators recursively to populate the stack.
3328: sub populateStack {
3329: my $self=shift;
3330: my $stack = shift;
3331:
3332: push @$stack, $self->{HERE} if ($self->{HERE});
3333:
3334: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3335: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3336: }
3337: }
3338:
3339: 1;
3340:
3341: package Apache::lonnavmaps::resource;
3342: use WeakRef;
3343: use Apache::lonnet;
3344:
3345: =pod
3346:
3347: =head1 Object: resource
3348:
3349: X<resource, navmap object>
3350: A resource object encapsulates a resource in a resource map, allowing
3351: easy manipulation of the resource, querying the properties of the
3352: resource (including user properties), and represents a reference that
3353: can be used as the canonical representation of the resource by
3354: lonnavmap clients like renderers.
3355:
3356: A resource only makes sense in the context of a navmap, as some of the
3357: data is stored in the navmap object.
3358:
3359: You will probably never need to instantiate this object directly. Use
3360: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3361: starting resource.
3362:
3363: Resource objects respect the parameter_hiddenparts, which suppresses
3364: various parts according to the wishes of the map author. As of this
3365: writing, there is no way to override this parameter, and suppressed
3366: parts will never be returned, nor will their response types or ids be
3367: stored.
3368:
3369: =head2 Overview
3370:
3371: A B<Resource> is the most granular type of object in LON-CAPA that can
3372: be included in a course. It can either be a particular resource, like
3373: an HTML page, external resource, problem, etc., or it can be a
3374: container sequence, such as a "page" or a "map".
3375:
3376: To see a sequence from the user's point of view, please see the
3377: B<Creating a Course: Maps and Sequences> chapter of the Author's
3378: Manual.
3379:
3380: A Resource Object, once obtained from a navmap object via a B<getBy*>
3381: method of the navmap, or from an iterator, allows you to query
3382: information about that resource.
3383:
3384: Generally, you do not ever want to create a resource object yourself,
3385: so creation has been left undocumented. Always retrieve resources
3386: from navmap objects.
3387:
3388: =head3 Identifying Resources
3389:
3390: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3391: unique to that resource for a given course. X<resource ID, in big hash>
3392: The Resource ID has the form #.#, where the first number is the same
3393: for every resource in a map, and the second is unique. For instance,
3394: for a course laid out like this:
3395:
3396: * Problem 1
3397: * Map
3398: * Resource 2
3399: * Resource 3
3400:
3401: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3402: C<Resource 3> will share a first number. The second number may end up
3403: re-used between the two groups.
3404:
3405: The resource ID is only used in the big hash, but can be used in the
3406: context of a course to identify a resource easily. (For instance, the
3407: printing system uses it to record which resources from a sequence you
3408: wish to print.)
3409:
3410: X<symb> X<resource, symb>
3411: All resources also have B<symb>s, which uniquely identify a resource
3412: in a course. Many internal LON-CAPA functions expect a symb. A symb
3413: carries along with it the URL of the resource, and the map it appears
3414: in. Symbs are much larger then resource IDs.
3415:
3416: =cut
3417:
3418: sub new {
3419: # magic invocation to create a class instance
3420: my $proto = shift;
3421: my $class = ref($proto) || $proto;
3422: my $self = {};
3423:
3424: weaken($self->{NAV_MAP} = shift);
3425: $self->{ID} = shift;
3426:
3427: # Store this new resource in the parent nav map's cache.
3428: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3429: $self->{RESOURCE_ERROR} = 0;
3430:
3431: # A hash that can be used by two-pass algorithms to store data
3432: # about this resource in. Not used by the resource object
3433: # directly.
3434: $self->{DATA} = {};
3435:
3436: bless($self);
3437:
3438: return $self;
3439: }
3440:
3441: # private function: simplify the NAV_HASH lookups we keep doing
3442: # pass the name, and to automatically append my ID, pass a true val on the
3443: # second param
3444: sub navHash {
3445: my $self = shift;
3446: my $param = shift;
3447: my $id = shift;
3448: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3449: }
3450:
3451: =pod
3452:
3453: =head2 Methods
3454:
3455: Once you have a resource object, here's what you can do with it:
3456:
3457: =head3 Attribute Retrieval
3458:
3459: Every resource has certain attributes that can be retrieved and used:
3460:
3461: =over 4
3462:
3463: =item * B<ID>: Every resource has an ID that is unique for that
3464: resource in the course it is in. The ID is actually in the hash
3465: representing the resource, so for a resource object $res, obtain
3466: it via C<$res->{ID}).
3467:
3468: =item * B<compTitle>:
3469:
3470: Returns a "composite title", that is equal to $res->title() if the
3471: resource has a title, and is otherwise the last part of the URL (e.g.,
3472: "problem.problem").
3473:
3474: =item * B<ext>:
3475:
3476: Returns true if the resource is external.
3477:
3478: =item * B<kind>:
3479:
3480: Returns the kind of the resource from the compiled nav map.
3481:
3482: =item * B<randomout>:
3483:
3484: Returns true if this resource was chosen to NOT be shown to the user
3485: by the random map selection feature. In other words, this is usually
3486: false.
3487:
3488: =item * B<randompick>:
3489:
3490: Returns true for a map if the randompick feature is being used on the
3491: map. (?)
3492:
3493: =item * B<src>:
3494:
3495: Returns the source for the resource.
3496:
3497: =item * B<symb>:
3498:
3499: Returns the symb for the resource.
3500:
3501: =item * B<title>:
3502:
3503: Returns the title of the resource.
3504:
3505: =back
3506:
3507: =cut
3508:
3509: # These info functions can be used directly, as they don't return
3510: # resource information.
3511: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3512: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3513: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3514: sub from { my $self=shift; return $self->navHash("from_", 1); }
3515: # considered private and undocumented
3516: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3517: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3518: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3519: sub randompick {
3520: my $self = shift;
3521: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3522: '.0.parameter_randompick'};
3523: }
3524: sub link {
3525: my $self=shift;
3526: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3527: return $self->src;
3528: }
3529: sub src {
3530: my $self=shift;
3531: return $self->navHash("src_", 1);
3532: }
3533: sub shown_symb {
3534: my $self=shift;
3535: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3536: return $self->symb();
3537: }
3538: sub id {
3539: my $self=shift;
3540: return $self->{ID};
3541: }
3542: sub enclosing_map_src {
3543: my $self=shift;
3544: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3545: return $self->navHash('map_id_'.$first);
3546: }
3547: sub symb {
3548: my $self=shift;
3549: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3550: my $symbSrc = &Apache::lonnet::declutter($self->src());
3551: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3552: . '___' . $second . '___' . $symbSrc;
3553: return &Apache::lonnet::symbclean($symb);
3554: }
3555: sub wrap_symb {
3556: my $self = shift;
3557: return $self->{NAV_MAP}->wrap_symb($self->symb());
3558: }
3559: sub title {
3560: my $self=shift;
3561: if ($self->{ID} eq '0.0') {
3562: # If this is the top-level map, return the title of the course
3563: # since this map can not be titled otherwise.
3564: return $env{'course.'.$env{'request.course.id'}.'.description'};
3565: }
3566: return $self->navHash("title_", 1); }
3567: # considered private and undocumented
3568: sub to { my $self=shift; return $self->navHash("to_", 1); }
3569: sub condition {
3570: my $self=shift;
3571: my $undercond=$self->navHash("undercond_", 1);
3572: if (!defined($undercond)) { return 1; };
3573: my $condid=$self->navHash("condid_$undercond");
3574: if (!defined($condid)) { return 1; };
3575: my $condition=&Apache::lonnet::directcondval($condid);
3576: return $condition;
3577: }
3578:
3579: sub compTitle {
3580: my $self = shift;
3581: my $title = $self->title();
3582: $title=~s/\&colon\;/\:/gs;
3583: if (!$title) {
3584: $title = $self->src();
3585: $title = substr($title, rindex($title, '/') + 1);
3586: }
3587: return $title;
3588: }
3589: =pod
3590:
3591: B<Predicate Testing the Resource>
3592:
3593: These methods are shortcuts to deciding if a given resource has a given property.
3594:
3595: =over 4
3596:
3597: =item * B<is_map>:
3598:
3599: Returns true if the resource is a map type.
3600:
3601: =item * B<is_problem>:
3602:
3603: Returns true if the resource is a problem type, false
3604: otherwise. (Looks at the extension on the src field; might need more
3605: to work correctly.)
3606:
3607: =item * B<is_page>:
3608:
3609: Returns true if the resource is a page.
3610:
3611: =item * B<is_sequence>:
3612:
3613: Returns true if the resource is a sequence.
3614:
3615: =back
3616:
3617: =cut
3618:
3619: sub hasResource {
3620: my $self = shift;
3621: return $self->{NAV_MAP}->hasResource(@_);
3622: }
3623:
3624: sub retrieveResources {
3625: my $self = shift;
3626: return $self->{NAV_MAP}->retrieveResources(@_);
3627: }
3628:
3629: sub is_html {
3630: my $self=shift;
3631: my $src = $self->src();
3632: return ($src =~ /html$/);
3633: }
3634: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3635: sub is_page {
3636: my $self=shift;
3637: my $src = $self->src();
3638: return $self->navHash("is_map_", 1) &&
3639: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3640: }
3641: sub is_problem {
3642: my $self=shift;
3643: my $src = $self->src();
3644: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/)
3645: }
3646: sub contains_problem {
3647: my $self=shift;
3648: if ($self->is_page()) {
3649: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3650: return $hasProblem;
3651: }
3652: return 0;
3653: }
3654: sub is_sequence {
3655: my $self=shift;
3656: my $src = $self->src();
3657: return $self->navHash("is_map_", 1) &&
3658: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3659: }
3660: sub is_survey {
3661: my $self = shift();
3662: my $part = shift();
3663: if ($self->parmval('type',$part) eq 'survey') {
3664: return 1;
3665: }
3666: if ($self->src() =~ /\.(survey)$/) {
3667: return 1;
3668: }
3669: return 0;
3670: }
3671:
3672: sub is_empty_sequence {
3673: my $self=shift;
3674: my $src = $self->src();
3675: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3676: }
3677:
3678: # Private method: Shells out to the parmval in the nav map, handler parts.
3679: sub parmval {
3680: my $self = shift;
3681: my $what = shift;
3682: my $part = shift;
3683: if (!defined($part)) {
3684: $part = '0';
3685: }
3686: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3687: }
3688:
3689: =pod
3690:
3691: B<Map Methods>
3692:
3693: These methods are useful for getting information about the map
3694: properties of the resource, if the resource is a map (B<is_map>).
3695:
3696: =over 4
3697:
3698: =item * B<map_finish>:
3699:
3700: Returns a reference to a resource object corresponding to the finish
3701: resource of the map.
3702:
3703: =item * B<map_pc>:
3704:
3705: Returns the pc value of the map, which is the first number that
3706: appears in the resource ID of the resources in the map, and is the
3707: number that appears around the middle of the symbs of the resources in
3708: that map.
3709:
3710: =item * B<map_start>:
3711:
3712: Returns a reference to a resource object corresponding to the start
3713: resource of the map.
3714:
3715: =item * B<map_type>:
3716:
3717: Returns a string with the type of the map in it.
3718:
3719: =back
3720:
3721: =cut
3722:
3723: sub map_finish {
3724: my $self = shift;
3725: my $src = $self->src();
3726: $src = Apache::lonnet::clutter($src);
3727: my $res = $self->navHash("map_finish_$src", 0);
3728: $res = $self->{NAV_MAP}->getById($res);
3729: return $res;
3730: }
3731: sub map_pc {
3732: my $self = shift;
3733: my $src = $self->src();
3734: return $self->navHash("map_pc_$src", 0);
3735: }
3736: sub map_start {
3737: my $self = shift;
3738: my $src = $self->src();
3739: $src = Apache::lonnet::clutter($src);
3740: my $res = $self->navHash("map_start_$src", 0);
3741: $res = $self->{NAV_MAP}->getById($res);
3742: return $res;
3743: }
3744: sub map_type {
3745: my $self = shift;
3746: my $pc = $self->map_pc();
3747: return $self->navHash("map_type_$pc", 0);
3748: }
3749:
3750: #####
3751: # Property queries
3752: #####
3753:
3754: # These functions will be responsible for returning the CORRECT
3755: # VALUE for the parameter, no matter what. So while they may look
3756: # like direct calls to parmval, they can be more then that.
3757: # So, for instance, the duedate function should use the "duedatetype"
3758: # information, rather then the resource object user.
3759:
3760: =pod
3761:
3762: =head2 Resource Parameters
3763:
3764: In order to use the resource parameters correctly, the nav map must
3765: have been instantiated with genCourseAndUserOptions set to true, so
3766: the courseopt and useropt is read correctly. Then, you can call these
3767: functions to get the relevant parameters for the resource. Each
3768: function defaults to part "0", but can be directed to another part by
3769: passing the part as the parameter.
3770:
3771: These methods are responsible for getting the parameter correct, not
3772: merely reflecting the contents of the GDBM hashes. As we move towards
3773: dates relative to other dates, these methods should be updated to
3774: reflect that. (Then, anybody using these methods will not have to update
3775: their code.)
3776:
3777: =over 4
3778:
3779: =item * B<acc>:
3780:
3781: Get the Client IP/Name Access Control information.
3782:
3783: =item * B<answerdate>:
3784:
3785: Get the answer-reveal date for the problem.
3786:
3787: =item * B<awarded>:
3788:
3789: Gets the awarded value for the problem part. Requires genUserData set to
3790: true when the navmap object was created.
3791:
3792: =item * B<duedate>:
3793:
3794: Get the due date for the problem.
3795:
3796: =item * B<tries>:
3797:
3798: Get the number of tries the student has used on the problem.
3799:
3800: =item * B<maxtries>:
3801:
3802: Get the number of max tries allowed.
3803:
3804: =item * B<opendate>:
3805:
3806: Get the open date for the problem.
3807:
3808: =item * B<sig>:
3809:
3810: Get the significant figures setting.
3811:
3812: =item * B<tol>:
3813:
3814: Get the tolerance for the problem.
3815:
3816: =item * B<tries>:
3817:
3818: Get the number of tries the user has already used on the problem.
3819:
3820: =item * B<type>:
3821:
3822: Get the question type for the problem.
3823:
3824: =item * B<weight>:
3825:
3826: Get the weight for the problem.
3827:
3828: =back
3829:
3830: =cut
3831:
3832: sub acc {
3833: (my $self, my $part) = @_;
3834: return $self->parmval("acc", $part);
3835: }
3836: sub answerdate {
3837: (my $self, my $part) = @_;
3838: # Handle intervals
3839: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3840: return $self->duedate($part) +
3841: $self->parmval("answerdate", $part);
3842: }
3843: return $self->parmval("answerdate", $part);
3844: }
3845: sub awarded {
3846: my $self = shift; my $part = shift;
3847: $self->{NAV_MAP}->get_user_data();
3848: if (!defined($part)) { $part = '0'; }
3849: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3850: }
3851: sub duedate {
3852: (my $self, my $part) = @_;
3853: my $interval=$self->parmval("interval", $part);
3854: if ($interval) {
3855: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3856: if ($first_access) { return ($first_access+$interval); }
3857: }
3858: return $self->parmval("duedate", $part);
3859: }
3860: sub handgrade {
3861: (my $self, my $part) = @_;
3862: return $self->parmval("handgrade", $part);
3863: }
3864: sub maxtries {
3865: (my $self, my $part) = @_;
3866: return $self->parmval("maxtries", $part);
3867: }
3868: sub opendate {
3869: (my $self, my $part) = @_;
3870: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3871: return $self->duedate($part) -
3872: $self->parmval("opendate", $part);
3873: }
3874: return $self->parmval("opendate");
3875: }
3876: sub problemstatus {
3877: (my $self, my $part) = @_;
3878: return lc $self->parmval("problemstatus", $part);
3879: }
3880: sub sig {
3881: (my $self, my $part) = @_;
3882: return $self->parmval("sig", $part);
3883: }
3884: sub tol {
3885: (my $self, my $part) = @_;
3886: return $self->parmval("tol", $part);
3887: }
3888: sub tries {
3889: my $self = shift;
3890: my $tries = $self->queryRestoreHash('tries', shift);
3891: if (!defined($tries)) { return '0';}
3892: return $tries;
3893: }
3894: sub type {
3895: (my $self, my $part) = @_;
3896: return $self->parmval("type", $part);
3897: }
3898: sub weight {
3899: my $self = shift; my $part = shift;
3900: if (!defined($part)) { $part = '0'; }
3901: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3902: $self->symb(), $env{'user.domain'},
3903: $env{'user.name'},
3904: $env{'request.course.sec'});
3905: }
3906: sub part_display {
3907: my $self= shift(); my $partID = shift();
3908: if (! defined($partID)) { $partID = '0'; }
3909: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3910: $self->symb);
3911: if (! defined($display) || $display eq '') {
3912: $display = $partID;
3913: }
3914: return $display;
3915: }
3916:
3917: # Multiple things need this
3918: sub getReturnHash {
3919: my $self = shift;
3920:
3921: if (!defined($self->{RETURN_HASH})) {
3922: my %tmpHash = &Apache::lonnet::restore($self->symb());
3923: $self->{RETURN_HASH} = \%tmpHash;
3924: }
3925: }
3926:
3927: ######
3928: # Status queries
3929: ######
3930:
3931: # These methods query the status of problems.
3932:
3933: # If we need to count parts, this function determines the number of
3934: # parts from the metadata. When called, it returns a reference to a list
3935: # of strings corresponding to the parts. (Thus, using it in a scalar context
3936: # tells you how many parts you have in the problem:
3937: # $partcount = scalar($resource->countParts());
3938: # Don't use $self->{PARTS} directly because you don't know if it's been
3939: # computed yet.
3940:
3941: =pod
3942:
3943: =head2 Resource misc
3944:
3945: Misc. functions for the resource.
3946:
3947: =over 4
3948:
3949: =item * B<hasDiscussion>:
3950:
3951: Returns a false value if there has been discussion since the user last
3952: logged in, true if there has. Always returns false if the discussion
3953: data was not extracted when the nav map was constructed.
3954:
3955: =item * B<getFeedback>:
3956:
3957: Gets the feedback for the resource and returns the raw feedback string
3958: for the resource, or the null string if there is no feedback or the
3959: email data was not extracted when the nav map was constructed. Usually
3960: used like this:
3961:
3962: for (split(/\,/, $res->getFeedback())) {
3963: my $link = &Apache::lonnet::escape($_);
3964: ...
3965:
3966: and use the link as appropriate.
3967:
3968: =cut
3969:
3970: sub hasDiscussion {
3971: my $self = shift;
3972: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3973: }
3974:
3975: sub getFeedback {
3976: my $self = shift;
3977: my $source = $self->src();
3978: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3979: return $self->{NAV_MAP}->getFeedback($source);
3980: }
3981:
3982: sub getErrors {
3983: my $self = shift;
3984: my $source = $self->src();
3985: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3986: return $self->{NAV_MAP}->getErrors($source);
3987: }
3988:
3989: =pod
3990:
3991: =item * B<parts>():
3992:
3993: Returns a list reference containing sorted strings corresponding to
3994: each part of the problem. Single part problems have only a part '0'.
3995: Multipart problems do not return their part '0', since they typically
3996: do not really matter.
3997:
3998: =item * B<countParts>():
3999:
4000: Returns the number of parts of the problem a student can answer. Thus,
4001: for single part problems, returns 1. For multipart, it returns the
4002: number of parts in the problem, not including psuedo-part 0.
4003:
4004: =item * B<countResponses>():
4005:
4006: Returns the total number of responses in the problem a student can answer.
4007:
4008: =item * B<responseTypes>():
4009:
4010: Returns a hash whose keys are the response types. The values are the number
4011: of times each response type is used. This is for the I<entire> problem, not
4012: just a single part.
4013:
4014: =item * B<multipart>():
4015:
4016: Returns true if the problem is multipart, false otherwise. Use this instead
4017: of countParts if all you want is multipart/not multipart.
4018:
4019: =item * B<responseType>($part):
4020:
4021: Returns the response type of the part, without the word "response" on the
4022: end. Example return values: 'string', 'essay', 'numeric', etc.
4023:
4024: =item * B<responseIds>($part):
4025:
4026: Retreives the response IDs for the given part as an array reference containing
4027: strings naming the response IDs. This may be empty.
4028:
4029: =back
4030:
4031: =cut
4032:
4033: sub parts {
4034: my $self = shift;
4035:
4036: if ($self->ext) { return []; }
4037:
4038: $self->extractParts();
4039: return $self->{PARTS};
4040: }
4041:
4042: sub countParts {
4043: my $self = shift;
4044:
4045: my $parts = $self->parts();
4046:
4047: # If I left this here, then it's not necessary.
4048: #my $delta = 0;
4049: #for my $part (@$parts) {
4050: # if ($part eq '0') { $delta--; }
4051: #}
4052:
4053: if ($self->{RESOURCE_ERROR}) {
4054: return 0;
4055: }
4056:
4057: return scalar(@{$parts}); # + $delta;
4058: }
4059:
4060: sub countResponses {
4061: my $self = shift;
4062: my $count;
4063: foreach my $part (@{$self->parts()}) {
4064: $count+= scalar($self->responseIds($part));
4065: }
4066: return $count;
4067: }
4068:
4069: sub responseTypes {
4070: my $self = shift;
4071: my %responses;
4072: foreach my $part ($self->parts()) {
4073: foreach my $responsetype ($self->responseType($part)) {
4074: $responses{$responsetype}++ if (defined($responsetype));
4075: }
4076: }
4077: return %responses;
4078: }
4079:
4080: sub multipart {
4081: my $self = shift;
4082: return $self->countParts() > 1;
4083: }
4084:
4085: sub singlepart {
4086: my $self = shift;
4087: return $self->countParts() == 1;
4088: }
4089:
4090: sub responseType {
4091: my $self = shift;
4092: my $part = shift;
4093:
4094: $self->extractParts();
4095: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4096: return @{$self->{RESPONSE_TYPES}->{$part}};
4097: } else {
4098: return undef;
4099: }
4100: }
4101:
4102: sub responseIds {
4103: my $self = shift;
4104: my $part = shift;
4105:
4106: $self->extractParts();
4107: if (defined($self->{RESPONSE_IDS}->{$part})) {
4108: return @{$self->{RESPONSE_IDS}->{$part}};
4109: } else {
4110: return undef;
4111: }
4112: }
4113:
4114: # Private function: Extracts the parts information, both part names and
4115: # part types, and saves it.
4116: sub extractParts {
4117: my $self = shift;
4118:
4119: return if (defined($self->{PARTS}));
4120: return if ($self->ext);
4121:
4122: $self->{PARTS} = [];
4123:
4124: my %parts;
4125:
4126: # Retrieve part count, if this is a problem
4127: if ($self->is_problem()) {
4128: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4129: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4130:
4131: if ($partorder) {
4132: my @parts;
4133: for my $part (split (/,/,$partorder)) {
4134: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4135: push @parts, $part;
4136: $parts{$part} = 1;
4137: }
4138: }
4139: $self->{PARTS} = \@parts;
4140: } else {
4141: if (!$metadata) {
4142: $self->{RESOURCE_ERROR} = 1;
4143: $self->{PARTS} = [];
4144: $self->{PART_TYPE} = {};
4145: return;
4146: }
4147: foreach (split(/\,/,$metadata)) {
4148: if ($_ =~ /^(?:part|Task)_(.*)$/) {
4149: my $part = $1;
4150: # This floods the logs if it blows up
4151: if (defined($parts{$part})) {
4152: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4153: }
4154:
4155: # check to see if part is turned off.
4156:
4157: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4158: $parts{$part} = 1;
4159: }
4160: }
4161: }
4162: my @sortedParts = sort keys %parts;
4163: $self->{PARTS} = \@sortedParts;
4164: }
4165:
4166:
4167: # These hashes probably do not need names that end with "Hash"....
4168: my %responseIdHash;
4169: my %responseTypeHash;
4170:
4171:
4172: # Init the responseIdHash
4173: foreach (@{$self->{PARTS}}) {
4174: $responseIdHash{$_} = [];
4175: }
4176:
4177: # Now, the unfortunate thing about this is that parts, part name, and
4178: # response id are delimited by underscores, but both the part
4179: # name and response id can themselves have underscores in them.
4180: # So we have to use our knowlege of part names to figure out
4181: # where the part names begin and end, and even then, it is possible
4182: # to construct ambiguous situations.
4183: foreach (split /,/, $metadata) {
4184: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4185: my $responseType = $1;
4186: my $partStuff = $2;
4187: my $partIdSoFar = '';
4188: my @partChunks = split /_/, $partStuff;
4189: my $i = 0;
4190: for ($i = 0; $i < scalar(@partChunks); $i++) {
4191: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4192: $partIdSoFar .= $partChunks[$i];
4193: if ($parts{$partIdSoFar}) {
4194: my @otherChunks = @partChunks[$i+1..$#partChunks];
4195: my $responseId = join('_', @otherChunks);
4196: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4197: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4198: }
4199: }
4200: }
4201: }
4202: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4203: #
4204: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4205: if ($resorder) {
4206: my @resorder=split(/,/,$resorder);
4207: foreach my $part (keys(%responseIdHash)) {
4208: my $i=0;
4209: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4210: my @neworder;
4211: foreach my $possibleid (@resorder) {
4212: if (exists($resids{$possibleid})) {
4213: push(@neworder,$resids{$possibleid});
4214: }
4215: }
4216: my @ids;
4217: my @type;
4218: foreach my $element (@neworder) {
4219: push (@ids,$responseIdHash{$part}->[$element]);
4220: push (@type,$responseTypeHash{$part}->[$element]);
4221: }
4222: $responseIdHash{$part}=\@ids;
4223: $responseTypeHash{$part}=\@type;
4224: }
4225: }
4226: $self->{RESPONSE_IDS} = \%responseIdHash;
4227: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4228: }
4229:
4230: return;
4231: }
4232:
4233: =pod
4234:
4235: =head2 Resource Status
4236:
4237: Problem resources have status information, reflecting their various
4238: dates and completion statuses.
4239:
4240: There are two aspects to the status: the date-related information and
4241: the completion information.
4242:
4243: Idiomatic usage of these two methods would probably look something
4244: like
4245:
4246: foreach ($resource->parts()) {
4247: my $dateStatus = $resource->getDateStatus($_);
4248: my $completionStatus = $resource->getCompletionStatus($_);
4249:
4250: or
4251:
4252: my $status = $resource->status($_);
4253:
4254: ... use it here ...
4255: }
4256:
4257: Which you use depends on exactly what you are looking for. The
4258: status() function has been optimized for the nav maps display and may
4259: not precisely match what you need elsewhere.
4260:
4261: The symbolic constants shown below can be accessed through the
4262: resource object: C<$res->OPEN>.
4263:
4264: =over 4
4265:
4266: =item * B<getDateStatus>($part):
4267:
4268: ($part defaults to 0). A convenience function that returns a symbolic
4269: constant telling you about the date status of the part. The possible
4270: return values are:
4271:
4272: =back
4273:
4274: B<Date Codes>
4275:
4276: =over 4
4277:
4278: =item * B<OPEN_LATER>:
4279:
4280: The problem will be opened later.
4281:
4282: =item * B<OPEN>:
4283:
4284: Open and not yet due.
4285:
4286:
4287: =item * B<PAST_DUE_ANSWER_LATER>:
4288:
4289: The due date has passed, but the answer date has not yet arrived.
4290:
4291: =item * B<PAST_DUE_NO_ANSWER>:
4292:
4293: The due date has passed and there is no answer opening date set.
4294:
4295: =item * B<ANSWER_OPEN>:
4296:
4297: The answer date is here.
4298:
4299: =item * B<NETWORK_FAILURE>:
4300:
4301: The information is unknown due to network failure.
4302:
4303: =back
4304:
4305: =cut
4306:
4307: # Apparently the compiler optimizes these into constants automatically
4308: sub OPEN_LATER { return 0; }
4309: sub OPEN { return 1; }
4310: sub PAST_DUE_NO_ANSWER { return 2; }
4311: sub PAST_DUE_ANSWER_LATER { return 3; }
4312: sub ANSWER_OPEN { return 4; }
4313: sub NOTHING_SET { return 5; }
4314: sub NETWORK_FAILURE { return 100; }
4315:
4316: # getDateStatus gets the date status for a given problem part.
4317: # Because answer date, due date, and open date are fully independent
4318: # (i.e., it is perfectly possible to *only* have an answer date),
4319: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4320: # (past, future, none given). This function handles this with a decision
4321: # tree. Read the comments to follow the decision tree.
4322:
4323: sub getDateStatus {
4324: my $self = shift;
4325: my $part = shift;
4326: $part = "0" if (!defined($part));
4327:
4328: # Always return network failure if there was one.
4329: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4330:
4331: my $now = time();
4332:
4333: my $open = $self->opendate($part);
4334: my $due = $self->duedate($part);
4335: my $answer = $self->answerdate($part);
4336:
4337: if (!$open && !$due && !$answer) {
4338: # no data on the problem at all
4339: # should this be the same as "open later"? think multipart.
4340: return $self->NOTHING_SET;
4341: }
4342: if (!$open || $now < $open) {return $self->OPEN_LATER}
4343: if (!$due || $now < $due) {return $self->OPEN}
4344: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4345: if ($answer) { return $self->ANSWER_OPEN; }
4346: return PAST_DUE_NO_ANSWER;
4347: }
4348:
4349: =pod
4350:
4351: B<>
4352:
4353: =over 4
4354:
4355: =item * B<getCompletionStatus>($part):
4356:
4357: ($part defaults to 0.) A convenience function that returns a symbolic
4358: constant telling you about the completion status of the part, with the
4359: following possible results:
4360:
4361: =back
4362:
4363: B<Completion Codes>
4364:
4365: =over 4
4366:
4367: =item * B<NOT_ATTEMPTED>:
4368:
4369: Has not been attempted at all.
4370:
4371: =item * B<INCORRECT>:
4372:
4373: Attempted, but wrong by student.
4374:
4375: =item * B<INCORRECT_BY_OVERRIDE>:
4376:
4377: Attempted, but wrong by instructor override.
4378:
4379: =item * B<CORRECT>:
4380:
4381: Correct or correct by instructor.
4382:
4383: =item * B<CORRECT_BY_OVERRIDE>:
4384:
4385: Correct by instructor override.
4386:
4387: =item * B<EXCUSED>:
4388:
4389: Excused. Not yet implemented.
4390:
4391: =item * B<NETWORK_FAILURE>:
4392:
4393: Information not available due to network failure.
4394:
4395: =item * B<ATTEMPTED>:
4396:
4397: Attempted, and not yet graded.
4398:
4399: =back
4400:
4401: =cut
4402:
4403: sub NOT_ATTEMPTED { return 10; }
4404: sub INCORRECT { return 11; }
4405: sub INCORRECT_BY_OVERRIDE { return 12; }
4406: sub CORRECT { return 13; }
4407: sub CORRECT_BY_OVERRIDE { return 14; }
4408: sub EXCUSED { return 15; }
4409: sub ATTEMPTED { return 16; }
4410:
4411: sub getCompletionStatus {
4412: my $self = shift;
4413: my $part = shift;
4414: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4415:
4416: my $status = $self->queryRestoreHash('solved', $part);
4417:
4418: # Left as separate if statements in case we ever do more with this
4419: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4420: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4421: if ($status eq 'correct_by_override') {
4422: return $self->CORRECT_BY_OVERRIDE;
4423: }
4424: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4425: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4426: if ($status eq 'excused') {return $self->EXCUSED; }
4427: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4428: return $self->NOT_ATTEMPTED;
4429: }
4430:
4431: sub queryRestoreHash {
4432: my $self = shift;
4433: my $hashentry = shift;
4434: my $part = shift;
4435: $part = "0" if (!defined($part) || $part eq '');
4436: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4437:
4438: $self->getReturnHash();
4439:
4440: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4441: }
4442:
4443: =pod
4444:
4445: B<Composite Status>
4446:
4447: Along with directly returning the date or completion status, the
4448: resource object includes a convenience function B<status>() that will
4449: combine the two status tidbits into one composite status that can
4450: represent the status of the resource as a whole. This method represents
4451: the concept of the thing we want to display to the user on the nav maps
4452: screen, which is a combination of completion and open status. The precise logic is
4453: documented in the comments of the status method. The following results
4454: may be returned, all available as methods on the resource object
4455: ($res->NETWORK_FAILURE): In addition to the return values that match
4456: the date or completion status, this function can return "ANSWER_SUBMITTED"
4457: if that problemstatus parameter value is set to No, suppressing the
4458: incorrect/correct feedback.
4459:
4460: =over 4
4461:
4462: =item * B<NETWORK_FAILURE>:
4463:
4464: The network has failed and the information is not available.
4465:
4466: =item * B<NOTHING_SET>:
4467:
4468: No dates have been set for this problem (part) at all. (Because only
4469: certain parts of a multi-part problem may be assigned, this can not be
4470: collapsed into "open later", as we do not know a given part will EVER
4471: be opened. For single part, this is the same as "OPEN_LATER".)
4472:
4473: =item * B<CORRECT>:
4474:
4475: For any reason at all, the part is considered correct.
4476:
4477: =item * B<EXCUSED>:
4478:
4479: For any reason at all, the problem is excused.
4480:
4481: =item * B<PAST_DUE_NO_ANSWER>:
4482:
4483: The problem is past due, not considered correct, and no answer date is
4484: set.
4485:
4486: =item * B<PAST_DUE_ANSWER_LATER>:
4487:
4488: The problem is past due, not considered correct, and an answer date in
4489: the future is set.
4490:
4491: =item * B<ANSWER_OPEN>:
4492:
4493: The problem is past due, not correct, and the answer is now available.
4494:
4495: =item * B<OPEN_LATER>:
4496:
4497: The problem is not yet open.
4498:
4499: =item * B<TRIES_LEFT>:
4500:
4501: The problem is open, has been tried, is not correct, but there are
4502: tries left.
4503:
4504: =item * B<INCORRECT>:
4505:
4506: The problem is open, and all tries have been used without getting the
4507: correct answer.
4508:
4509: =item * B<OPEN>:
4510:
4511: The item is open and not yet tried.
4512:
4513: =item * B<ATTEMPTED>:
4514:
4515: The problem has been attempted.
4516:
4517: =item * B<ANSWER_SUBMITTED>:
4518:
4519: An answer has been submitted, but the student should not see it.
4520:
4521: =back
4522:
4523: =cut
4524:
4525: sub TRIES_LEFT { return 20; }
4526: sub ANSWER_SUBMITTED { return 21; }
4527: sub PARTIALLY_CORRECT{ return 22; }
4528:
4529: sub status {
4530: my $self = shift;
4531: my $part = shift;
4532: if (!defined($part)) { $part = "0"; }
4533: my $completionStatus = $self->getCompletionStatus($part);
4534: my $dateStatus = $self->getDateStatus($part);
4535:
4536: # What we have is a two-dimensional matrix with 4 entries on one
4537: # dimension and 5 entries on the other, which we want to colorize,
4538: # plus network failure and "no date data at all".
4539:
4540: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4541: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4542:
4543: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4544: # If there's an answer date and we're past it, don't
4545: # suppress the feedback; student should know
4546: if ($self->duedate($part) && $self->duedate($part) < time() &&
4547: $self->answerdate($part) && $self->answerdate($part) < time()) {
4548: $suppressFeedback = 0;
4549: }
4550:
4551: # There are a few whole rows we can dispose of:
4552: if ($completionStatus == CORRECT ||
4553: $completionStatus == CORRECT_BY_OVERRIDE ) {
4554: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4555: my $awarded=$self->awarded($part);
4556: if ($awarded < 1 && $awarded > 0) {
4557: return PARTIALLY_CORRECT;
4558: } elsif ($awarded<1) {
4559: return INCORRECT;
4560: }
4561: return CORRECT;
4562: }
4563:
4564: if ($completionStatus == ATTEMPTED) {
4565: return ATTEMPTED;
4566: }
4567:
4568: # If it's EXCUSED, then return that no matter what
4569: if ($completionStatus == EXCUSED) {
4570: return EXCUSED;
4571: }
4572:
4573: if ($dateStatus == NOTHING_SET) {
4574: return NOTHING_SET;
4575: }
4576:
4577: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4578: # by 4 matrix (date statuses).
4579:
4580: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4581: $dateStatus == PAST_DUE_NO_ANSWER ) {
4582: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4583: }
4584:
4585: if ($dateStatus == ANSWER_OPEN) {
4586: return ANSWER_OPEN;
4587: }
4588:
4589: # Now: (incorrect, incorrect_override, not_attempted) x
4590: # (open_later), (open)
4591:
4592: if ($dateStatus == OPEN_LATER) {
4593: return OPEN_LATER;
4594: }
4595:
4596: # If it's WRONG...
4597: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4598: # and there are TRIES LEFT:
4599: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4600: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4601: }
4602: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4603: }
4604:
4605: # Otherwise, it's untried and open
4606: return OPEN;
4607: }
4608:
4609: sub CLOSED { return 23; }
4610: sub ERROR { return 24; }
4611:
4612: =pod
4613:
4614: B<Simple Status>
4615:
4616: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4617: "Simple status" corresponds to "which icon is shown on the
4618: Navmaps". There are six "simple" statuses:
4619:
4620: =over 4
4621:
4622: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4623:
4624: =item * B<OPEN>: The problem is open and unattempted.
4625:
4626: =item * B<CORRECT>: The problem is correct for any reason.
4627:
4628: =item * B<INCORRECT>: The problem is incorrect and can still be
4629: completed successfully.
4630:
4631: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4632: does not know if they are correct. (The ellipsis icon.)
4633:
4634: =item * B<ERROR>: There is an error retrieving information about this
4635: problem.
4636:
4637: =back
4638:
4639: =cut
4640:
4641: # This hash maps the composite status to this simple status, and
4642: # can be used directly, if you like
4643: my %compositeToSimple =
4644: (
4645: NETWORK_FAILURE() => ERROR,
4646: NOTHING_SET() => CLOSED,
4647: CORRECT() => CORRECT,
4648: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4649: EXCUSED() => CORRECT,
4650: PAST_DUE_NO_ANSWER() => INCORRECT,
4651: PAST_DUE_ANSWER_LATER() => INCORRECT,
4652: ANSWER_OPEN() => INCORRECT,
4653: OPEN_LATER() => CLOSED,
4654: TRIES_LEFT() => OPEN,
4655: INCORRECT() => INCORRECT,
4656: OPEN() => OPEN,
4657: ATTEMPTED() => ATTEMPTED,
4658: ANSWER_SUBMITTED() => ATTEMPTED
4659: );
4660:
4661: sub simpleStatus {
4662: my $self = shift;
4663: my $part = shift;
4664: my $status = $self->status($part);
4665: return $compositeToSimple{$status};
4666: }
4667:
4668: =pod
4669:
4670: B<simpleStatusCount> will return an array reference containing, in
4671: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4672: and ERROR parts the given problem has.
4673:
4674: =cut
4675:
4676: # This maps the status to the slot we want to increment
4677: my %statusToSlotMap =
4678: (
4679: OPEN() => 0,
4680: CLOSED() => 1,
4681: CORRECT() => 2,
4682: INCORRECT() => 3,
4683: ATTEMPTED() => 4,
4684: ERROR() => 5
4685: );
4686:
4687: sub statusToSlot { return $statusToSlotMap{shift()}; }
4688:
4689: sub simpleStatusCount {
4690: my $self = shift;
4691:
4692: my @counts = (0, 0, 0, 0, 0, 0, 0);
4693: foreach my $part (@{$self->parts()}) {
4694: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4695: }
4696:
4697: return \@counts;
4698: }
4699:
4700: =pod
4701:
4702: B<Completable>
4703:
4704: The completable method represents the concept of I<whether the student can
4705: currently do the problem>. If the student can do the problem, which means
4706: that it is open, there are tries left, and if the problem is manually graded
4707: or the grade is suppressed via problemstatus, the student has not tried it
4708: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4709: either the student has tried it and there is no feedback, or that for
4710: some reason it is no longer completable (not open yet, successfully completed,
4711: out of tries, etc.). As an example, this is used as the filter for the
4712: "Uncompleted Homework" option for the nav maps.
4713:
4714: If this does not quite meet your needs, do not fiddle with it (unless you are
4715: fixing it to better match the student's conception of "completable" because
4716: it's broken somehow)... make a new method.
4717:
4718: =cut
4719:
4720: sub completable {
4721: my $self = shift;
4722: if (!$self->is_problem()) { return 0; }
4723: my $partCount = $self->countParts();
4724:
4725: foreach my $part (@{$self->parts()}) {
4726: if ($part eq '0' && $partCount != 1) { next; }
4727: my $status = $self->status($part);
4728: # "If any of the parts are open, or have tries left (implies open),
4729: # and it is not "attempted" (manually graded problem), it is
4730: # not "complete"
4731: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4732: $status == ANSWER_SUBMITTED() ) {
4733: # did this part already, as well as we can
4734: next;
4735: }
4736: if ($status == OPEN() || $status == TRIES_LEFT()) {
4737: return 1;
4738: }
4739: }
4740:
4741: # If all the parts were complete, so was this problem.
4742: return 0;
4743: }
4744:
4745: =pod
4746:
4747: =head2 Resource/Nav Map Navigation
4748:
4749: =over 4
4750:
4751: =item * B<getNext>():
4752:
4753: Retreive an array of the possible next resources after this
4754: one. Always returns an array, even in the one- or zero-element case.
4755:
4756: =item * B<getPrevious>():
4757:
4758: Retreive an array of the possible previous resources from this
4759: one. Always returns an array, even in the one- or zero-element case.
4760:
4761: =cut
4762:
4763: sub getNext {
4764: my $self = shift;
4765: my @branches;
4766: my $to = $self->to();
4767: foreach my $branch ( split(/,/, $to) ) {
4768: my $choice = $self->{NAV_MAP}->getById($branch);
4769: if (!$choice->condition()) { next; }
4770: my $next = $choice->goesto();
4771: $next = $self->{NAV_MAP}->getById($next);
4772:
4773: push @branches, $next;
4774: }
4775: return \@branches;
4776: }
4777:
4778: sub getPrevious {
4779: my $self = shift;
4780: my @branches;
4781: my $from = $self->from();
4782: foreach my $branch ( split /,/, $from) {
4783: my $choice = $self->{NAV_MAP}->getById($branch);
4784: my $prev = $choice->comesfrom();
4785: $prev = $self->{NAV_MAP}->getById($prev);
4786:
4787: push @branches, $prev;
4788: }
4789: return \@branches;
4790: }
4791:
4792: sub browsePriv {
4793: my $self = shift;
4794: if (defined($self->{BROWSE_PRIV})) {
4795: return $self->{BROWSE_PRIV};
4796: }
4797:
4798: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4799: $self->symb());
4800: }
4801:
4802: =pod
4803:
4804: =back
4805:
4806: =cut
4807:
4808: 1;
4809:
4810: __END__
4811:
4812:
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