1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.338 2005/09/23 21:30:25 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 $mustCloseNavMap = 0;
1405: my $navmap;
1406: if (defined($args->{'navmap'})) {
1407: $navmap = $args->{'navmap'};
1408: }
1409:
1410: my $r = $args->{'r'};
1411: my $queryString = $args->{'queryString'};
1412: my $jump = $args->{'jump'};
1413: my $here = $args->{'here'};
1414: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1415: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1416: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1417: # before the current resource when using #current
1418:
1419: # If we were passed 'here' information, we are not rendering
1420: # after a folder manipulation, and we were not passed an
1421: # iterator, make sure we open the folders to show the "here"
1422: # marker
1423: my $filterHash = {};
1424: # Figure out what we're not displaying
1425: foreach (split(/\,/, $env{"form.filter"})) {
1426: if ($_) {
1427: $filterHash->{$_} = "1";
1428: }
1429: }
1430:
1431: # Filter: Remember filter function and add our own filter: Refuse
1432: # to show hidden resources unless the user can see them.
1433: my $userCanSeeHidden = advancedUser();
1434: my $filterFunc = setDefault($args->{'filterFunc'},
1435: sub {return 1;});
1436: if (!$userCanSeeHidden) {
1437: # Without renaming the filterfunc, the server seems to go into
1438: # an infinite loop
1439: my $oldFilterFunc = $filterFunc;
1440: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1441: &$oldFilterFunc($res);};
1442: }
1443:
1444: my $condition = 0;
1445: if ($env{'form.condition'}) {
1446: $condition = 1;
1447: }
1448:
1449: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1450: # Step 1: Check to see if we have a navmap
1451: if (!defined($navmap)) {
1452: $navmap = Apache::lonnavmaps::navmap->new();
1453: $mustCloseNavMap = 1;
1454: }
1455:
1456: # Step two: Locate what kind of here marker is necessary
1457: # Determine where the "here" marker is and where the screen jumps to.
1458:
1459: if ($env{'form.postsymb'} ne '') {
1460: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1461: } elsif ($env{'form.postdata'} ne '') {
1462: # couldn't find a symb, is there a URL?
1463: my $currenturl = $env{'form.postdata'};
1464: #$currenturl=~s/^http\:\/\///;
1465: #$currenturl=~s/^[^\/]+//;
1466:
1467: $here = $jump = &Apache::lonnet::symbread($currenturl);
1468: }
1469: if ($here eq '') {
1470: my $last;
1471: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1472: &GDBM_READER(),0640)) {
1473: $last=$hash{'last_known'};
1474: untie(%hash);
1475: }
1476: if ($last) { $here = $jump = $last; }
1477: }
1478:
1479: # Step three: Ensure the folders are open
1480: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1481: my $curRes;
1482: my $found = 0;
1483:
1484: # We only need to do this if we need to open the maps to show the
1485: # current position. This will change the counter so we can't count
1486: # for the jump marker with this loop.
1487: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1488: if (ref($curRes) && $curRes->symb() eq $here) {
1489: my $mapStack = $mapIterator->getStack();
1490:
1491: # Ensure the parent maps are open
1492: for my $map (@{$mapStack}) {
1493: if ($condition) {
1494: undef $filterHash->{$map->map_pc()};
1495: } else {
1496: $filterHash->{$map->map_pc()} = 1;
1497: }
1498: }
1499: $found = 1;
1500: }
1501: }
1502: }
1503:
1504: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1505: # If this is a click on a folder or something, we want to preserve the "here"
1506: # from the querystring, and get the new "jump" marker
1507: $here = $env{'form.here'};
1508: $jump = $env{'form.jump'};
1509: }
1510:
1511: my $it = $args->{'iterator'};
1512: if (!defined($it)) {
1513: # Construct a default iterator based on $env{'form.'} information
1514:
1515: # Step 1: Check to see if we have a navmap
1516: if (!defined($navmap)) {
1517: $navmap = Apache::lonnavmaps::navmap->new();
1518: $mustCloseNavMap = 1;
1519: }
1520:
1521: # See if we're being passed a specific map
1522: if ($args->{'iterator_map'}) {
1523: my $map = $args->{'iterator_map'};
1524: $map = $navmap->getResourceByUrl($map);
1525: my $firstResource = $map->map_start();
1526: my $finishResource = $map->map_finish();
1527:
1528: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1529: } else {
1530: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1531: }
1532: }
1533:
1534: # (re-)Locate the jump point, if any
1535: # Note this does not take filtering or hidden into account... need
1536: # to be fixed?
1537: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1538: my $curRes;
1539: my $foundJump = 0;
1540: my $counter = 0;
1541:
1542: while (($curRes = $mapIterator->next()) && !$foundJump) {
1543: if (ref($curRes)) { $counter++; }
1544:
1545: if (ref($curRes) && $jump eq $curRes->symb()) {
1546:
1547: # This is why we have to use the main iterator instead of the
1548: # potentially faster DFS: The count has to be the same, so
1549: # the order has to be the same, which DFS won't give us.
1550: $args->{'currentJumpIndex'} = $counter;
1551: $foundJump = 1;
1552: }
1553: }
1554:
1555: my $showParts = setDefault($args->{'showParts'}, 1);
1556: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1557: # keeps track of when the current resource is found,
1558: # so we can back up a few and put the anchor above the
1559: # current resource
1560: my $printKey = $args->{'printKey'};
1561: my $printCloseAll = $args->{'printCloseAll'};
1562: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1563:
1564: # Print key?
1565: if ($printKey) {
1566: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1567: my $date=localtime;
1568: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1569: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1570: if ($navmap->{LAST_CHECK}) {
1571: $result .=
1572: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1573: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1574: '</td><td align="center" valign="bottom"> '.
1575: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1576: '</td>';
1577: } else {
1578: $result .= '<td align="center" valign="bottom"> '.
1579: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1580: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1581: '</td>';
1582: }
1583:
1584: $result .= '</tr></table>';
1585: }
1586:
1587: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1588: my ($link,$text);
1589: if ($condition) {
1590: $link='"navmaps?condition=0&filter=&'.$queryString.
1591: '&here='.&Apache::lonnet::escape($here).'"';
1592: $text='Close All Folders';
1593: } else {
1594: $link='"navmaps?condition=1&filter=&'.$queryString.
1595: '&here='.&Apache::lonnet::escape($here).'"';
1596: $text='Open All Folders';
1597: }
1598: if ($args->{'caller'} eq 'navmapsdisplay') {
1599: &add_linkitem($args->{'linkitems'},'changefolder',
1600: 'location.href='.$link,$text);
1601: } else {
1602: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1603: }
1604: $result .= "\n";
1605: }
1606:
1607: # Check for any unread discussions in all resources.
1608: if ($args->{'caller'} eq 'navmapsdisplay') {
1609: &add_linkitem($args->{'linkitems'},'clearbubbles',
1610: 'document.clearbubbles.submit()',
1611: 'Mark all posts read');
1612: my $time=time;
1613: $result .= (<<END);
1614: <form name="clearbubbles" method="post" action="/adm/feedback">
1615: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1616: <input type="hidden" name="navtime" value="$time" />
1617: END
1618: if ($args->{'sort'} eq 'discussion') {
1619: my $totdisc = 0;
1620: my $haveDisc = '';
1621: my @allres=$navmap->retrieveResources();
1622: foreach my $resource (@allres) {
1623: if ($resource->hasDiscussion()) {
1624: $haveDisc .= $resource->wrap_symb().':';
1625: $totdisc ++;
1626: }
1627: }
1628: if ($totdisc > 0) {
1629: $haveDisc =~ s/:$//;
1630: $result .= (<<END);
1631: <input type="hidden" name="navmaps" value="$haveDisc" />
1632: </form>
1633: END
1634: }
1635: }
1636: $result.='</form>';
1637: }
1638:
1639: if ($args->{'caller'} eq 'navmapsdisplay') {
1640: $result .= '<table><tr><td>'.
1641: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1642: if ($env{'environment.remotenavmap'} ne 'on') {
1643: $result .= '<td> </td>';
1644: } else {
1645: $result .= '</tr><tr>';
1646: }
1647: $result.=&show_linkitems($args->{'linkitems'});
1648: if ($args->{'sort_html'}) {
1649: if ($env{'environment.remotenavmap'} ne 'on') {
1650: $result.='<td> </td><td> </td><td> </td>'.
1651: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1652: } else {
1653: $result.='</tr><tr><td align="left"><br />'.
1654: $args->{'sort_html'}.'</td></tr>';
1655: }
1656: }
1657: $result .= '</table>';
1658: } elsif ($args->{'sort_html'}) {
1659: $result.=$args->{'sort_html'};
1660: }
1661:
1662: $result .= "<br />\n";
1663: if ($r) {
1664: $r->print($result);
1665: $r->rflush();
1666: $result = "";
1667: }
1668: # End parameter setting
1669:
1670: # Data
1671: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1672: my $res = "Apache::lonnavmaps::resource";
1673: my %condenseStatuses =
1674: ( $res->NETWORK_FAILURE => 1,
1675: $res->NOTHING_SET => 1,
1676: $res->CORRECT => 1 );
1677: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1678:
1679: # Shared variables
1680: $args->{'counter'} = 0; # counts the rows
1681: $args->{'indentLevel'} = 0;
1682: $args->{'isNewBranch'} = 0;
1683: $args->{'condensed'} = 0;
1684: my $location=
1685: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1686: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1687: $args->{'displayedHereMarker'} = 0;
1688:
1689: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1690: # since structure actually doesn't matter, except what map has what resources.
1691: if ($args->{'suppressEmptySequences'}) {
1692: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1693: $it->{FIRST_RESOURCE},
1694: $it->{FINISH_RESOURCE},
1695: {}, undef, 1);
1696: my $depth = 0;
1697: $dfsit->next();
1698: my $curRes = $dfsit->next();
1699: while ($depth > -1) {
1700: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1701: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1702:
1703: if (ref($curRes)) {
1704: # Parallel pre-processing: Do sequences have non-filtered-out children?
1705: if ($curRes->is_map()) {
1706: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1707: # Sequences themselves do not count as visible children,
1708: # unless those sequences also have visible children.
1709: # This means if a sequence appears, there's a "promise"
1710: # that there's something under it if you open it, somewhere.
1711: } else {
1712: # Not a sequence: if it's filtered, ignore it, otherwise
1713: # rise up the stack and mark the sequences as having children
1714: if (&$filterFunc($curRes)) {
1715: for my $sequence (@{$dfsit->getStack()}) {
1716: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1717: }
1718: }
1719: }
1720: }
1721: } continue {
1722: $curRes = $dfsit->next();
1723: }
1724: }
1725:
1726: my $displayedJumpMarker = 0;
1727: # Set up iteration.
1728: my $now = time();
1729: my $in24Hours = $now + 24 * 60 * 60;
1730: my $rownum = 0;
1731:
1732: # export "here" marker information
1733: $args->{'here'} = $here;
1734:
1735: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1736: my @resources;
1737: my $code='';# sub { !(shift->is_map();) };
1738: if ($args->{'sort'} eq 'title') {
1739: my $oldFilterFunc = $filterFunc;
1740: my $filterFunc=
1741: sub {
1742: my ($res)=@_;
1743: if ($res->is_map()) { return 0;}
1744: return &$oldFilterFunc($res);
1745: };
1746: @resources=$navmap->retrieveResources(undef,$filterFunc);
1747: @resources= sort { &cmp_title($a,$b) } @resources;
1748: } elsif ($args->{'sort'} eq 'duedate') {
1749: my $oldFilterFunc = $filterFunc;
1750: my $filterFunc=
1751: sub {
1752: my ($res)=@_;
1753: if (!$res->is_problem()) { return 0;}
1754: return &$oldFilterFunc($res);
1755: };
1756: @resources=$navmap->retrieveResources(undef,$filterFunc);
1757: @resources= sort {
1758: if ($a->duedate ne $b->duedate) {
1759: return $a->duedate cmp $b->duedate;
1760: }
1761: my $value=&cmp_title($a,$b);
1762: return $value;
1763: } @resources;
1764: } elsif ($args->{'sort'} eq 'discussion') {
1765: my $oldFilterFunc = $filterFunc;
1766: my $filterFunc=
1767: sub {
1768: my ($res)=@_;
1769: if (!$res->hasDiscussion() &&
1770: !$res->getFeedback() &&
1771: !$res->getErrors()) { return 0;}
1772: return &$oldFilterFunc($res);
1773: };
1774: @resources=$navmap->retrieveResources(undef,$filterFunc);
1775: @resources= sort { &cmp_title($a,$b) } @resources;
1776: } else {
1777: #unknow sort mechanism or default
1778: undef($args->{'sort'});
1779: }
1780:
1781:
1782: while (1) {
1783: if ($args->{'sort'}) {
1784: $curRes = shift(@resources);
1785: } else {
1786: $curRes = $it->next($closeAllPages);
1787: }
1788: if (!$curRes) { last; }
1789:
1790: # Maintain indentation level.
1791: if ($curRes == $it->BEGIN_MAP() ||
1792: $curRes == $it->BEGIN_BRANCH() ) {
1793: $args->{'indentLevel'}++;
1794: }
1795: if ($curRes == $it->END_MAP() ||
1796: $curRes == $it->END_BRANCH() ) {
1797: $args->{'indentLevel'}--;
1798: }
1799: # Notice new branches
1800: if ($curRes == $it->BEGIN_BRANCH()) {
1801: $args->{'isNewBranch'} = 1;
1802: }
1803:
1804: # If this isn't an actual resource, continue on
1805: if (!ref($curRes)) {
1806: next;
1807: }
1808:
1809: # If this has been filtered out, continue on
1810: if (!(&$filterFunc($curRes))) {
1811: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1812: next;
1813: }
1814:
1815: # If this is an empty sequence and we're filtering them, continue on
1816: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1817: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1818: next;
1819: }
1820:
1821: # If we're suppressing navmaps and this is a navmap, continue on
1822: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1823: next;
1824: }
1825:
1826: $args->{'counter'}++;
1827:
1828: # Does it have multiple parts?
1829: $args->{'multipart'} = 0;
1830: $args->{'condensed'} = 0;
1831: my @parts;
1832:
1833: # Decide what parts to show.
1834: if ($curRes->is_problem() && $showParts) {
1835: @parts = @{$curRes->parts()};
1836: $args->{'multipart'} = $curRes->multipart();
1837:
1838: if ($condenseParts) { # do the condensation
1839: if (!$curRes->opendate("0")) {
1840: @parts = ();
1841: $args->{'condensed'} = 1;
1842: }
1843: if (!$args->{'condensed'}) {
1844: # Decide whether to condense based on similarity
1845: my $status = $curRes->status($parts[0]);
1846: my $due = $curRes->duedate($parts[0]);
1847: my $open = $curRes->opendate($parts[0]);
1848: my $statusAllSame = 1;
1849: my $dueAllSame = 1;
1850: my $openAllSame = 1;
1851: for (my $i = 1; $i < scalar(@parts); $i++) {
1852: if ($curRes->status($parts[$i]) != $status){
1853: $statusAllSame = 0;
1854: }
1855: if ($curRes->duedate($parts[$i]) != $due ) {
1856: $dueAllSame = 0;
1857: }
1858: if ($curRes->opendate($parts[$i]) != $open) {
1859: $openAllSame = 0;
1860: }
1861: }
1862: # $*allSame is true if all the statuses were
1863: # the same. Now, if they are all the same and
1864: # match one of the statuses to condense, or they
1865: # are all open with the same due date, or they are
1866: # all OPEN_LATER with the same open date, display the
1867: # status of the first non-zero part (to get the 'correct'
1868: # status right, since 0 is never 'correct' or 'open').
1869: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1870: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1871: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1872: @parts = ($parts[0]);
1873: $args->{'condensed'} = 1;
1874: }
1875: }
1876: # Multipart problem with one part: always "condense" (happens
1877: # to match the desirable behavior)
1878: if ($curRes->countParts() == 1) {
1879: @parts = ($parts[0]);
1880: $args->{'condensed'} = 1;
1881: }
1882: }
1883: }
1884:
1885: # If the multipart problem was condensed, "forget" it was multipart
1886: if (scalar(@parts) == 1) {
1887: $args->{'multipart'} = 0;
1888: } else {
1889: # Add part 0 so we display it correctly.
1890: unshift @parts, '0';
1891: }
1892:
1893: {
1894: my ($src,$symb,$anchor,$stack);
1895: if ($args->{'sort'}) {
1896: my $it = $navmap->getIterator(undef, undef, undef, 1);
1897: while ( my $res=$it->next()) {
1898: if (ref($res) &&
1899: $res->symb() eq $curRes->symb()) { last; }
1900: }
1901: $stack=$it->getStack();
1902: } else {
1903: $stack=$it->getStack();
1904: }
1905: ($src,$symb,$anchor)=getLinkForResource($stack);
1906: if (defined($anchor)) { $anchor='#'.$anchor; }
1907: my $srcHasQuestion = $src =~ /\?/;
1908: $args->{"resourceLink"} = $src.
1909: ($srcHasQuestion?'&':'?') .
1910: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1911: }
1912: # Now, we've decided what parts to show. Loop through them and
1913: # show them.
1914: foreach my $part (@parts) {
1915: $rownum ++;
1916: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1917:
1918: $result .= " <tr bgcolor='$backgroundColor'>\n";
1919:
1920: # Set up some data about the parts that the cols might want
1921: my $filter = $it->{FILTER};
1922:
1923: # Now, display each column.
1924: foreach my $col (@$cols) {
1925: my $colHTML = '';
1926: if (ref($col)) {
1927: $colHTML .= &$col($curRes, $part, $args);
1928: } else {
1929: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1930: }
1931:
1932: # If this is the first column and it's time to print
1933: # the anchor, do so
1934: if ($col == $cols->[0] &&
1935: $args->{'counter'} == $args->{'currentJumpIndex'} -
1936: $currentJumpDelta) {
1937: # Jam the anchor after the <td> tag;
1938: # necessary for valid HTML (which Mozilla requires)
1939: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1940: $displayedJumpMarker = 1;
1941: }
1942: $result .= $colHTML . "\n";
1943: }
1944: $result .= " </tr>\n";
1945: $args->{'isNewBranch'} = 0;
1946: }
1947:
1948: if ($r && $rownum % 20 == 0) {
1949: $r->print($result);
1950: $result = "";
1951: $r->rflush();
1952: }
1953: } continue {
1954: if ($r) {
1955: # If we have the connection, make sure the user is still connected
1956: my $c = $r->connection;
1957: if ($c->aborted()) {
1958: # Who cares what we do, nobody will see it anyhow.
1959: return '';
1960: }
1961: }
1962: }
1963:
1964: # Print out the part that jumps to #curloc if it exists
1965: # delay needed because the browser is processing the jump before
1966: # it finishes rendering, so it goes to the wrong place!
1967: # onload might be better, but this routine has no access to that.
1968: # On mozilla, the 0-millisecond timeout seems to prevent this;
1969: # it's quite likely this might fix other browsers, too, and
1970: # certainly won't hurt anything.
1971: if ($displayedJumpMarker) {
1972: $result .= "
1973: <script>
1974: if (location.href.indexOf('#curloc')==-1) {
1975: setTimeout(\"location += '#curloc';\", 0)
1976: }
1977: </script>";
1978: }
1979:
1980: $result .= "</table>";
1981:
1982: if ($r) {
1983: $r->print($result);
1984: $result = "";
1985: $r->rflush();
1986: }
1987:
1988: return $result;
1989: }
1990:
1991: sub add_linkitem {
1992: my ($linkitems,$name,$cmd,$text)=@_;
1993: $$linkitems{$name}{'cmd'}=$cmd;
1994: $$linkitems{$name}{'text'}=&mt($text);
1995: }
1996:
1997: sub show_linkitems {
1998: my ($linkitems)=@_;
1999: my @linkorder = ("blank","launchnav","closenav","firsthomework",
2000: "everything","uncompleted","changefolder","clearbubbles");
2001:
2002: my $result .= (<<ENDBLOCK);
2003: <td align="left">
2004: <script type="text/javascript">
2005: function changeNavDisplay () {
2006: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
2007: ENDBLOCK
2008: foreach my $link (@linkorder) {
2009: $result.= "if (navchoice == '$link') {".
2010: $linkitems->{$link}{'cmd'}."}\n";
2011: }
2012: $result.='}
2013: </script>
2014: <form name="linkitems" method="post">
2015: <nobr><select name="toplink">'."\n";
2016: foreach my $link (@linkorder) {
2017: if (defined($linkitems->{$link})) {
2018: if ($linkitems->{$link}{'text'} ne '') {
2019: $result .= ' <option value="'.$link.'">'.
2020: $linkitems->{$link}{'text'}."</option>\n";
2021: }
2022: }
2023: }
2024: $result .= '</select> <input type="button" name="chgnav"
2025: value="Go" onClick="javascript:changeNavDisplay()" />
2026: </nobr></form></td>'."\n";
2027:
2028: return $result;
2029: }
2030:
2031: 1;
2032:
2033: package Apache::lonnavmaps::navmap;
2034:
2035: =pod
2036:
2037: =head1 Object: Apache::lonnavmaps::navmap
2038:
2039: =head2 Overview
2040:
2041: The navmap object's job is to provide access to the resources
2042: in the course as Apache::lonnavmaps::resource objects, and to
2043: query and manage the relationship between those resource objects.
2044:
2045: Generally, you'll use the navmap object in one of three basic ways.
2046: In order of increasing complexity and power:
2047:
2048: =over 4
2049:
2050: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2051: various ways to obtain resource objects, based on various identifiers.
2052: Use this when you want to request information about one object or
2053: a handful of resources you already know the identities of, from some
2054: other source. For more about Ids, Symbs, and MapPcs, see the
2055: Resource documentation. Note that Url should be a B<last resort>,
2056: not your first choice; it only works when there is only one
2057: instance of the resource in the course, which only applies to
2058: maps, and even that may change in the future.
2059:
2060: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2061: retrieves resources matching some criterion and returns them
2062: in a flat array, with no structure information. Use this when
2063: you are manipulating a series of resources, based on what map
2064: the are in, but do not care about branching, or exactly how
2065: the maps and resources are related. This is the most common case.
2066:
2067: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2068: the course's navmap in various ways without writing the traversal
2069: code yourself. See iterator documentation below. Use this when
2070: you need to know absolutely everything about the course, including
2071: branches and the precise relationship between maps and resources.
2072:
2073: =back
2074:
2075: =head2 Creation And Destruction
2076:
2077: To create a navmap object, use the following function:
2078:
2079: =over 4
2080:
2081: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2082:
2083: Creates a new navmap object. Returns the navmap object if this is
2084: successful, or B<undef> if not.
2085:
2086: =back
2087:
2088: =head2 Methods
2089:
2090: =over 4
2091:
2092: =item * B<getIterator>(first, finish, filter, condition):
2093:
2094: See iterator documentation below.
2095:
2096: =cut
2097:
2098: use strict;
2099: use GDBM_File;
2100: use Apache::lonnet;
2101:
2102: sub new {
2103: # magic invocation to create a class instance
2104: my $proto = shift;
2105: my $class = ref($proto) || $proto;
2106: my $self = {};
2107:
2108: # Resource cache stores navmap resources as we reference them. We generate
2109: # them on-demand so we don't pay for creating resources unless we use them.
2110: $self->{RESOURCE_CACHE} = {};
2111:
2112: # Network failure flag, if we accessed the course or user opt and
2113: # failed
2114: $self->{NETWORK_FAILURE} = 0;
2115:
2116: # tie the nav hash
2117:
2118: my %navmaphash;
2119: my %parmhash;
2120: my $courseFn = $env{"request.course.fn"};
2121: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2122: &GDBM_READER(), 0640))) {
2123: return undef;
2124: }
2125:
2126: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2127: &GDBM_READER(), 0640)))
2128: {
2129: untie %{$self->{PARM_HASH}};
2130: return undef;
2131: }
2132:
2133: $self->{NAV_HASH} = \%navmaphash;
2134: $self->{PARM_HASH} = \%parmhash;
2135: $self->{PARM_CACHE} = {};
2136:
2137: bless($self);
2138:
2139: return $self;
2140: }
2141:
2142: sub generate_course_user_opt {
2143: my $self = shift;
2144: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2145:
2146: my $uname=$env{'user.name'};
2147: my $udom=$env{'user.domain'};
2148: my $cid=$env{'request.course.id'};
2149: my $cdom=$env{'course.'.$cid.'.domain'};
2150: my $cnum=$env{'course.'.$cid.'.num'};
2151:
2152: # ------------------------------------------------- Get coursedata (if present)
2153: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2154: # Check for network failure
2155: if (!ref($courseopt)) {
2156: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2157: $self->{NETWORK_FAILURE} = 1;
2158: }
2159: undef($courseopt);
2160: }
2161:
2162: # --------------------------------------------------- Get userdata (if present)
2163:
2164: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2165: # Check for network failure
2166: if (!ref($useropt)) {
2167: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2168: $self->{NETWORK_FAILURE} = 1;
2169: }
2170: undef($useropt);
2171: }
2172:
2173: $self->{COURSE_OPT} = $courseopt;
2174: $self->{USER_OPT} = $useropt;
2175:
2176: $self->{COURSE_USER_OPT_GENERATED} = 1;
2177:
2178: return;
2179: }
2180:
2181: sub generate_email_discuss_status {
2182: my $self = shift;
2183: my $symb = shift;
2184: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2185:
2186: my $cid=$env{'request.course.id'};
2187: my $cdom=$env{'course.'.$cid.'.domain'};
2188: my $cnum=$env{'course.'.$cid.'.num'};
2189:
2190: my %emailstatus = &Apache::lonnet::dump('email_status');
2191: my $logoutTime = $emailstatus{'logout'};
2192: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2193: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2194: $courseLeaveTime : $logoutTime);
2195: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2196: $cdom, $cnum);
2197: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2198: $env{'user.domain'},$env{'user.name'},'lastread');
2199: my %lastreadtime = ();
2200: foreach (keys %lastread) {
2201: my $key = $_;
2202: $key =~ s/_lastread$//;
2203: $lastreadtime{$key} = $lastread{$_};
2204: }
2205:
2206: my %feedback=();
2207: my %error=();
2208: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2209: $env{'user.name'});
2210:
2211: foreach my $msgid (@keys) {
2212: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2213: my $plain=
2214: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2215: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2216: my ($what,$url)=($1,$2);
2217: if ($what eq 'Error') {
2218: $error{$url}.=','.$msgid;
2219: } else {
2220: $feedback{$url}.=','.$msgid;
2221: }
2222: }
2223: }
2224: }
2225:
2226: #url's of resources that have feedbacks
2227: $self->{FEEDBACK} = \%feedback;
2228: #or errors
2229: $self->{ERROR_MSG} = \%error;
2230: $self->{DISCUSSION_TIME} = \%discussiontime;
2231: $self->{EMAIL_STATUS} = \%emailstatus;
2232: $self->{LAST_READ} = \%lastreadtime;
2233:
2234: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2235: }
2236:
2237: sub get_user_data {
2238: my $self = shift;
2239: if ($self->{RETRIEVED_USER_DATA}) { return; }
2240:
2241: # Retrieve performance data on problems
2242: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2243: $env{'user.domain'},
2244: $env{'user.name'});
2245: $self->{STUDENT_DATA} = \%student_data;
2246:
2247: $self->{RETRIEVED_USER_DATA} = 1;
2248: }
2249:
2250: # Internal function: Takes a key to look up in the nav hash and implements internal
2251: # memory caching of that key.
2252: sub navhash {
2253: my $self = shift; my $key = shift;
2254: return $self->{NAV_HASH}->{$key};
2255: }
2256:
2257: =pod
2258:
2259: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2260: false otherwise. Undefined course maps indicate an error somewhere in
2261: LON-CAPA, and you will not be able to proceed with using the navmap.
2262: See the B<NAV> screen for an example of using this.
2263:
2264: =cut
2265:
2266: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2267: sub courseMapDefined {
2268: my $self = shift;
2269: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2270:
2271: my $firstres = $self->navhash("map_start_$uri");
2272: my $lastres = $self->navhash("map_finish_$uri");
2273: return $firstres && $lastres;
2274: }
2275:
2276: sub getIterator {
2277: my $self = shift;
2278: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2279: shift, undef, shift,
2280: shift, shift);
2281: return $iterator;
2282: }
2283:
2284: # Private method: Does the given resource (as a symb string) have
2285: # current discussion? Returns 0 if chat/mail data not extracted.
2286: sub hasDiscussion {
2287: my $self = shift;
2288: my $symb = shift;
2289: $self->generate_email_discuss_status();
2290:
2291: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2292:
2293: #return defined($self->{DISCUSSION_TIME}->{$symb});
2294:
2295: # backward compatibility (bulletin boards used to be 'wrapped')
2296: my $ressymb = $self->wrap_symb($symb);
2297: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2298: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2299: } else {
2300: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2301: 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).
2302: }
2303: }
2304:
2305: sub wrap_symb {
2306: my $self = shift;
2307: my $symb = shift;
2308: if ($symb =~ m-___(adm/\w+/\w+/)(\d+)(/bulletinboard)$-) {
2309: unless ($symb =~ m|adm/wrapper/adm|) {
2310: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2311: }
2312: }
2313: return $symb;
2314: }
2315:
2316: # Private method: Does the given resource (as a symb string) have
2317: # current feedback? Returns the string in the feedback hash, which
2318: # will be false if it does not exist.
2319:
2320: sub getFeedback {
2321: my $self = shift;
2322: my $symb = shift;
2323:
2324: $self->generate_email_discuss_status();
2325:
2326: if (!defined($self->{FEEDBACK})) { return ""; }
2327:
2328: return $self->{FEEDBACK}->{$symb};
2329: }
2330:
2331: # Private method: Get the errors for that resource (by source).
2332: sub getErrors {
2333: my $self = shift;
2334: my $src = shift;
2335:
2336: $self->generate_email_discuss_status();
2337:
2338: if (!defined($self->{ERROR_MSG})) { return ""; }
2339: return $self->{ERROR_MSG}->{$src};
2340: }
2341:
2342: =pod
2343:
2344: =item * B<getById>(id):
2345:
2346: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2347: object for that resource. This method, or other methods that use it
2348: (as in the resource object) is the only proper way to obtain a
2349: resource object.
2350:
2351: =item * B<getBySymb>(symb):
2352:
2353: Based on the symb of the resource, get a resource object for that
2354: resource. This is one of the proper ways to get a resource object.
2355:
2356: =item * B<getMapByMapPc>(map_pc):
2357:
2358: Based on the map_pc of the resource, get a resource object for
2359: the given map. This is one of the proper ways to get a resource object.
2360:
2361: =cut
2362:
2363: # The strategy here is to cache the resource objects, and only construct them
2364: # as we use them. The real point is to prevent reading any more from the tied
2365: # hash then we have to, which should hopefully alleviate speed problems.
2366:
2367: sub getById {
2368: my $self = shift;
2369: my $id = shift;
2370:
2371: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2372: {
2373: return $self->{RESOURCE_CACHE}->{$id};
2374: }
2375:
2376: # resource handles inserting itself into cache.
2377: # Not clear why the quotes are necessary, but as of this
2378: # writing it doesn't work without them.
2379: return "Apache::lonnavmaps::resource"->new($self, $id);
2380: }
2381:
2382: sub getBySymb {
2383: my $self = shift;
2384: my $symb = shift;
2385:
2386: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2387: my $map = $self->getResourceByUrl($mapUrl);
2388: my $returnvalue = undef;
2389: if (ref($map)) {
2390: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2391: }
2392: return $returnvalue;
2393: }
2394:
2395: sub getByMapPc {
2396: my $self = shift;
2397: my $map_pc = shift;
2398: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2399: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2400: return $self->getById($map_id);
2401: }
2402:
2403: =pod
2404:
2405: =item * B<firstResource>():
2406:
2407: Returns a resource object reference corresponding to the first
2408: resource in the navmap.
2409:
2410: =cut
2411:
2412: sub firstResource {
2413: my $self = shift;
2414: my $firstResource = $self->navhash('map_start_' .
2415: &Apache::lonnet::clutter($env{'request.course.uri'}));
2416: return $self->getById($firstResource);
2417: }
2418:
2419: =pod
2420:
2421: =item * B<finishResource>():
2422:
2423: Returns a resource object reference corresponding to the last resource
2424: in the navmap.
2425:
2426: =cut
2427:
2428: sub finishResource {
2429: my $self = shift;
2430: my $firstResource = $self->navhash('map_finish_' .
2431: &Apache::lonnet::clutter($env{'request.course.uri'}));
2432: return $self->getById($firstResource);
2433: }
2434:
2435: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2436: # the actual lookup; parmval caches the results.
2437: sub parmval {
2438: my $self = shift;
2439: my ($what,$symb)=@_;
2440: my $hashkey = $what."|||".$symb;
2441:
2442: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2443: return $self->{PARM_CACHE}->{$hashkey};
2444: }
2445:
2446: my $result = $self->parmval_real($what, $symb);
2447: $self->{PARM_CACHE}->{$hashkey} = $result;
2448: return $result;
2449: }
2450:
2451: sub parmval_real {
2452: my $self = shift;
2453: my ($what,$symb,$recurse) = @_;
2454:
2455: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2456: $self->generate_course_user_opt();
2457:
2458: my $cid=$env{'request.course.id'};
2459: my $csec=$env{'request.course.sec'};
2460: my $uname=$env{'user.name'};
2461: my $udom=$env{'user.domain'};
2462:
2463: unless ($symb) { return ''; }
2464: my $result='';
2465:
2466: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2467:
2468: # ----------------------------------------------------- Cascading lookup scheme
2469: my $rwhat=$what;
2470: $what=~s/^parameter\_//;
2471: $what=~s/\_/\./;
2472:
2473: my $symbparm=$symb.'.'.$what;
2474: my $mapparm=$mapname.'___(all).'.$what;
2475: my $usercourseprefix=$cid;
2476:
2477: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2478: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2479: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2480:
2481: my $courselevel= $usercourseprefix.'.'.$what;
2482: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2483: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2484:
2485: my $useropt = $self->{USER_OPT};
2486: my $courseopt = $self->{COURSE_OPT};
2487: my $parmhash = $self->{PARM_HASH};
2488:
2489: # ---------------------------------------------------------- first, check user
2490: if ($uname and defined($useropt)) {
2491: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2492: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2493: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2494: }
2495:
2496: # ------------------------------------------------------- second, check course
2497: if ($csec and defined($courseopt)) {
2498: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2499: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2500: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2501: }
2502:
2503: if (defined($courseopt)) {
2504: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2505: }
2506:
2507: # ----------------------------------------------------- third, check map parms
2508:
2509: my $thisparm=$$parmhash{$symbparm};
2510: if (defined($thisparm)) { return $thisparm; }
2511:
2512: # ----------------------------------------------------- fourth , check default
2513:
2514: my $meta_rwhat=$rwhat;
2515: $meta_rwhat=~s/\./_/g;
2516: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2517: if (defined($default)) { return $default}
2518: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2519: if (defined($default)) { return $default}
2520:
2521: # --------------------------------------------------- fifth, check more course
2522: if (defined($courseopt)) {
2523: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2524: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2525: }
2526:
2527: # --------------------------------------------------- sixth , cascade up parts
2528:
2529: my ($space,@qualifier)=split(/\./,$rwhat);
2530: my $qualifier=join('.',@qualifier);
2531: unless ($space eq '0') {
2532: my @parts=split(/_/,$space);
2533: my $id=pop(@parts);
2534: my $part=join('_',@parts);
2535: if ($part eq '') { $part='0'; }
2536: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2537: if (defined($partgeneral)) { return $partgeneral; }
2538: }
2539: if ($recurse) { return undef; }
2540: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2541: if (defined($pack_def)) { return $pack_def; }
2542: return '';
2543: }
2544:
2545: =pod
2546:
2547: =item * B<getResourceByUrl>(url):
2548:
2549: Retrieves a resource object by URL of the resource. If passed a
2550: resource object, it will simply return it, so it is safe to use this
2551: method in code like "$res = $navmap->getResourceByUrl($res)", if
2552: you're not sure if $res is already an object, or just a URL. If the
2553: resource appears multiple times in the course, only the first instance
2554: will be returned. As a result, this is probably useful only for maps.
2555:
2556: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2557:
2558: The map is a specification of a map to retreive the resources from,
2559: either as a url or as an object. The filterFunc is a reference to a
2560: function that takes a resource object as its one argument and returns
2561: true if the resource should be included, or false if it should not
2562: be. If recursive is true, the map will be recursively examined,
2563: otherwise it will not be. If bailout is true, the function will return
2564: as soon as it finds a resource, if false it will finish. If showall is
2565: true it will not hide maps that contain nothing but one other map. By
2566: default, the map is the top-level map of the course, filterFunc is a
2567: function that always returns 1, recursive is true, bailout is false,
2568: showall is false. The resources will be returned in a list containing
2569: the resource objects for the corresponding resources, with B<no
2570: structure information> in the list; regardless of branching,
2571: recursion, etc., it will be a flat list.
2572:
2573: Thus, this is suitable for cases where you don't want the structure,
2574: just a list of all resources. It is also suitable for finding out how
2575: many resources match a given description; for this use, if all you
2576: want to know is if I<any> resources match the description, the bailout
2577: parameter will allow you to avoid potentially expensive enumeration of
2578: all matching resources.
2579:
2580: =item * B<hasResource>(map, filterFunc, recursive, showall):
2581:
2582: Convience method for
2583:
2584: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2585:
2586: which will tell whether the map has resources matching the description
2587: in the filter function.
2588:
2589: =cut
2590:
2591:
2592: sub getResourceByUrl {
2593: my $self = shift;
2594: my $resUrl = shift;
2595:
2596: if (ref($resUrl)) { return $resUrl; }
2597:
2598: $resUrl = &Apache::lonnet::clutter($resUrl);
2599: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2600: if ($resId =~ /,/) {
2601: $resId = (split (/,/, $resId))[0];
2602: }
2603: if (!$resId) { return ''; }
2604: return $self->getById($resId);
2605: }
2606:
2607: sub retrieveResources {
2608: my $self = shift;
2609: my $map = shift;
2610: my $filterFunc = shift;
2611: if (!defined ($filterFunc)) {
2612: $filterFunc = sub {return 1;};
2613: }
2614: my $recursive = shift;
2615: if (!defined($recursive)) { $recursive = 1; }
2616: my $bailout = shift;
2617: if (!defined($bailout)) { $bailout = 0; }
2618: my $showall = shift;
2619: # Create the necessary iterator.
2620: if (!ref($map)) { # assume it's a url of a map.
2621: $map = $self->getResourceByUrl($map);
2622: }
2623:
2624: # If nothing was passed, assume top-level map
2625: if (!$map) {
2626: $map = $self->getById('0.0');
2627: }
2628:
2629: # Check the map's validity.
2630: if (!$map->is_map()) {
2631: # Oh, to throw an exception.... how I'd love that!
2632: return ();
2633: }
2634:
2635: # Get an iterator.
2636: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2637: undef, $recursive, $showall);
2638:
2639: my @resources = ();
2640:
2641: # Run down the iterator and collect the resources.
2642: my $curRes;
2643:
2644: while ($curRes = $it->next()) {
2645: if (ref($curRes)) {
2646: if (!&$filterFunc($curRes)) {
2647: next;
2648: }
2649:
2650: push @resources, $curRes;
2651:
2652: if ($bailout) {
2653: return @resources;
2654: }
2655: }
2656:
2657: }
2658:
2659: return @resources;
2660: }
2661:
2662: sub hasResource {
2663: my $self = shift;
2664: my $map = shift;
2665: my $filterFunc = shift;
2666: my $recursive = shift;
2667: my $showall = shift;
2668:
2669: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2670: }
2671:
2672: 1;
2673:
2674: package Apache::lonnavmaps::iterator;
2675: use WeakRef;
2676: use Apache::lonnet;
2677:
2678: =pod
2679:
2680: =back
2681:
2682: =head1 Object: navmap Iterator
2683:
2684: An I<iterator> encapsulates the logic required to traverse a data
2685: structure. navmap uses an iterator to traverse the course map
2686: according to the criteria you wish to use.
2687:
2688: To obtain an iterator, call the B<getIterator>() function of a
2689: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2690: directly.) This will return a reference to the iterator:
2691:
2692: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2693:
2694: To get the next thing from the iterator, call B<next>:
2695:
2696: C<my $nextThing = $resourceIterator-E<gt>next()>
2697:
2698: getIterator behaves as follows:
2699:
2700: =over 4
2701:
2702: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2703:
2704: All parameters are optional. firstResource is a resource reference
2705: corresponding to where the iterator should start. It defaults to
2706: navmap->firstResource() for the corresponding nav map. finishResource
2707: corresponds to where you want the iterator to end, defaulting to
2708: navmap->finishResource(). filterHash is a hash used as a set
2709: containing strings representing the resource IDs, defaulting to
2710: empty. Condition is a 1 or 0 that sets what to do with the filter
2711: hash: If a 0, then only resources that exist IN the filterHash will be
2712: recursed on. If it is a 1, only resources NOT in the filterHash will
2713: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2714: false (default), the iterator will only return the first level of map
2715: that is not just a single, 'redirecting' map. If true, the iterator
2716: will return all information, starting with the top-level map,
2717: regardless of content. returnTopMap, if true (default false), will
2718: cause the iterator to return the top-level map object (resource 0.0)
2719: before anything else.
2720:
2721: Thus, by default, only top-level resources will be shown. Change the
2722: condition to a 1 without changing the hash, and all resources will be
2723: shown. Changing the condition to 1 and including some values in the
2724: hash will allow you to selectively suppress parts of the navmap, while
2725: leaving it on 0 and adding things to the hash will allow you to
2726: selectively add parts of the nav map. See the handler code for
2727: examples.
2728:
2729: The iterator will return either a reference to a resource object, or a
2730: token representing something in the map, such as the beginning of a
2731: new branch. The possible tokens are:
2732:
2733: =over 4
2734:
2735: =item * B<END_ITERATOR>:
2736:
2737: The iterator has returned all that it's going to. Further calls to the
2738: iterator will just produce more of these. This is a "false" value, and
2739: is the only false value the iterator which will be returned, so it can
2740: be used as a loop sentinel.
2741:
2742: =item * B<BEGIN_MAP>:
2743:
2744: A new map is being recursed into. This is returned I<after> the map
2745: resource itself is returned.
2746:
2747: =item * B<END_MAP>:
2748:
2749: The map is now done.
2750:
2751: =item * B<BEGIN_BRANCH>:
2752:
2753: A branch is now starting. The next resource returned will be the first
2754: in that branch.
2755:
2756: =item * B<END_BRANCH>:
2757:
2758: The branch is now done.
2759:
2760: =back
2761:
2762: The tokens are retreivable via methods on the iterator object, i.e.,
2763: $iterator->END_MAP.
2764:
2765: Maps can contain empty resources. The iterator will automatically skip
2766: over such resources, but will still treat the structure
2767: correctly. Thus, a complicated map with several branches, but
2768: consisting entirely of empty resources except for one beginning or
2769: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2770: but only one resource will be returned.
2771:
2772: =back
2773:
2774: =head2 Normal Usage
2775:
2776: Normal usage of the iterator object is to do the following:
2777:
2778: my $it = $navmap->getIterator([your params here]);
2779: my $curRes;
2780: while ($curRes = $it->next()) {
2781: [your logic here]
2782: }
2783:
2784: Note that inside of the loop, it's frequently useful to check if
2785: "$curRes" is a reference or not with the reference function; only
2786: resource objects will be references, and any non-references will
2787: be the tokens described above.
2788:
2789: Also note there is some old code floating around that trys to track
2790: the depth of the iterator to see when it's done; do not copy that
2791: code. It is difficult to get right and harder to understand then
2792: this. They should be migrated to this new style.
2793:
2794: =cut
2795:
2796: # Here are the tokens for the iterator:
2797:
2798: sub END_ITERATOR { return 0; }
2799: sub BEGIN_MAP { return 1; } # begining of a new map
2800: sub END_MAP { return 2; } # end of the map
2801: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2802: sub END_BRANCH { return 4; } # end of a branch
2803: sub FORWARD { return 1; } # go forward
2804: sub BACKWARD { return 2; }
2805:
2806: sub min {
2807: (my $a, my $b) = @_;
2808: if ($a < $b) { return $a; } else { return $b; }
2809: }
2810:
2811: sub new {
2812: # magic invocation to create a class instance
2813: my $proto = shift;
2814: my $class = ref($proto) || $proto;
2815: my $self = {};
2816:
2817: weaken($self->{NAV_MAP} = shift);
2818: return undef unless ($self->{NAV_MAP});
2819:
2820: # Handle the parameters
2821: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2822: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2823:
2824: # If the given resources are just the ID of the resource, get the
2825: # objects
2826: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2827: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2828: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2829: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2830:
2831: $self->{FILTER} = shift;
2832:
2833: # A hash, used as a set, of resource already seen
2834: $self->{ALREADY_SEEN} = shift;
2835: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2836: $self->{CONDITION} = shift;
2837:
2838: # Do we want to automatically follow "redirection" maps?
2839: $self->{FORCE_TOP} = shift;
2840:
2841: # Do we want to return the top-level map object (resource 0.0)?
2842: $self->{RETURN_0} = shift;
2843: # have we done that yet?
2844: $self->{HAVE_RETURNED_0} = 0;
2845:
2846: # Now, we need to pre-process the map, by walking forward and backward
2847: # over the parts of the map we're going to look at.
2848:
2849: # The processing steps are exactly the same, except for a few small
2850: # changes, so I bundle those up in the following list of two elements:
2851: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2852: # first_resource).
2853: # This prevents writing nearly-identical code twice.
2854: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2855: 'FIRST_RESOURCE'],
2856: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2857: 'FINISH_RESOURCE'] );
2858:
2859: my $maxDepth = 0; # tracks max depth
2860:
2861: # If there is only one resource in this map, and it's a map, we
2862: # want to remember that, so the user can ask for the first map
2863: # that isn't just a redirector.
2864: my $resource; my $resourceCount = 0;
2865:
2866: # Documentation on this algorithm can be found in the CVS repository at
2867: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2868: # in that file.
2869: # **1**
2870:
2871: foreach my $pass (@iterations) {
2872: my $direction = $pass->[0];
2873: my $valName = $pass->[1];
2874: my $nextResourceMethod = $pass->[2];
2875: my $firstResourceName = $pass->[3];
2876:
2877: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2878: $self->{FIRST_RESOURCE},
2879: $self->{FINISH_RESOURCE},
2880: {}, undef, 0, $direction);
2881:
2882: # prime the recursion
2883: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2884: $iterator->next();
2885: my $curRes = $iterator->next();
2886: my $depth = 1;
2887: while ($depth > 0) {
2888: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2889: if ($curRes == $iterator->END_MAP()) { $depth--; }
2890:
2891: if (ref($curRes)) {
2892: # If there's only one resource, this will save it
2893: # we have to filter empty resources from consideration here,
2894: # or even "empty", redirecting maps have two (start & finish)
2895: # or three (start, finish, plus redirector)
2896: if($direction == FORWARD && $curRes->src()) {
2897: $resource = $curRes; $resourceCount++;
2898: }
2899: my $resultingVal = $curRes->{DATA}->{$valName};
2900: my $nextResources = $curRes->$nextResourceMethod();
2901: my $nextCount = scalar(@{$nextResources});
2902:
2903: if ($nextCount == 1) { # **3**
2904: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2905: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2906: }
2907:
2908: if ($nextCount > 1) { # **4**
2909: foreach my $res (@{$nextResources}) {
2910: my $current = $res->{DATA}->{$valName} || 999999999;
2911: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2912: }
2913: }
2914: }
2915:
2916: # Assign the final val (**2**)
2917: if (ref($curRes) && $direction == BACKWARD()) {
2918: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2919: $curRes->{DATA}->{BOT_UP_VAL});
2920:
2921: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2922: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2923: }
2924:
2925: $curRes = $iterator->next();
2926: }
2927: }
2928:
2929: # Check: Was this only one resource, a map?
2930: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2931: my $firstResource = $resource->map_start();
2932: my $finishResource = $resource->map_finish();
2933: return
2934: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2935: $finishResource, $self->{FILTER},
2936: $self->{ALREADY_SEEN},
2937: $self->{CONDITION},
2938: $self->{FORCE_TOP});
2939:
2940: }
2941:
2942: # Set up some bookkeeping information.
2943: $self->{CURRENT_DEPTH} = 0;
2944: $self->{MAX_DEPTH} = $maxDepth;
2945: $self->{STACK} = [];
2946: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2947: $self->{FINISHED} = 0; # When true, the iterator has finished
2948:
2949: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2950: push @{$self->{STACK}}, [];
2951: }
2952:
2953: # Prime the recursion w/ the first resource **5**
2954: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2955: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2956:
2957: bless ($self);
2958:
2959: return $self;
2960: }
2961:
2962: sub next {
2963: my $self = shift;
2964: my $closeAllPages=shift;
2965: if ($self->{FINISHED}) {
2966: return END_ITERATOR();
2967: }
2968:
2969: # If we want to return the top-level map object, and haven't yet,
2970: # do so.
2971: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2972: $self->{HAVE_RETURNED_0} = 1;
2973: return $self->{NAV_MAP}->getById('0.0');
2974: }
2975:
2976: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2977: # grab the next from the recursive iterator
2978: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2979:
2980: # is it a begin or end map? If so, update the depth
2981: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2982: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2983:
2984: # Are we back at depth 0? If so, stop recursing
2985: if ($self->{RECURSIVE_DEPTH} == 0) {
2986: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2987: }
2988:
2989: return $next;
2990: }
2991:
2992: if (defined($self->{FORCE_NEXT})) {
2993: my $tmp = $self->{FORCE_NEXT};
2994: $self->{FORCE_NEXT} = undef;
2995: return $tmp;
2996: }
2997:
2998: # Have we not yet begun? If not, return BEGIN_MAP and
2999: # remember we've started.
3000: if ( !$self->{STARTED} ) {
3001: $self->{STARTED} = 1;
3002: return $self->BEGIN_MAP();
3003: }
3004:
3005: # Here's the guts of the iterator.
3006:
3007: # Find the next resource, if any.
3008: my $found = 0;
3009: my $i = $self->{MAX_DEPTH};
3010: my $newDepth;
3011: my $here;
3012: while ( $i >= 0 && !$found ) {
3013: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3014: $here = pop @{$self->{STACK}->[$i]}; # **7**
3015: $found = 1;
3016: $newDepth = $i;
3017: }
3018: $i--;
3019: }
3020:
3021: # If we still didn't find anything, we're done.
3022: if ( !$found ) {
3023: # We need to get back down to the correct branch depth
3024: if ( $self->{CURRENT_DEPTH} > 0 ) {
3025: $self->{CURRENT_DEPTH}--;
3026: return END_BRANCH();
3027: } else {
3028: $self->{FINISHED} = 1;
3029: return END_MAP();
3030: }
3031: }
3032:
3033: # If this is not a resource, it must be an END_BRANCH marker we want
3034: # to return directly.
3035: if (!ref($here)) { # **8**
3036: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3037: $self->{CURRENT_DEPTH}--;
3038: return $here;
3039: }
3040: }
3041:
3042: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3043: $self->{HERE} = $here;
3044:
3045: # Get to the right level
3046: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3047: push @{$self->{STACK}->[$newDepth]}, $here;
3048: $self->{CURRENT_DEPTH}--;
3049: return END_BRANCH();
3050: }
3051: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3052: push @{$self->{STACK}->[$newDepth]}, $here;
3053: $self->{CURRENT_DEPTH}++;
3054: return BEGIN_BRANCH();
3055: }
3056:
3057: # If we made it here, we have the next resource, and we're at the
3058: # right branch level. So let's examine the resource for where
3059: # we can get to from here.
3060:
3061: # So we need to look at all the resources we can get to from here,
3062: # categorize them if we haven't seen them, remember if we have a new
3063: my $nextUnfiltered = $here->getNext();
3064: my $maxDepthAdded = -1;
3065:
3066: for (@$nextUnfiltered) {
3067: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3068: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3069: push @{$self->{STACK}->[$depth]}, $_;
3070: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3071: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3072: }
3073: }
3074:
3075: # Is this the end of a branch? If so, all of the resources examined above
3076: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3077: # marker onto the stack so we don't forget.
3078: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3079: # BC branch and gets to C, it will see F as the only next resource, but it's
3080: # one level lower. Thus, this is the end of the branch, since there are no
3081: # more resources added to this level or above.
3082: # We don't do this if the examined resource is the finish resource,
3083: # because the condition given above is true, but the "END_MAP" will
3084: # take care of things and we should already be at depth 0.
3085: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3086: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3087: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3088: }
3089:
3090: # That ends the main iterator logic. Now, do we want to recurse
3091: # down this map (if this resource is a map)?
3092: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3093: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3094: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3095: my $firstResource = $self->{HERE}->map_start();
3096: my $finishResource = $self->{HERE}->map_finish();
3097:
3098: $self->{RECURSIVE_ITERATOR} =
3099: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3100: $finishResource, $self->{FILTER},
3101: $self->{ALREADY_SEEN},
3102: $self->{CONDITION},
3103: $self->{FORCE_TOP});
3104: }
3105:
3106: # If this is a blank resource, don't actually return it.
3107: # Should you ever find you need it, make sure to add an option to the code
3108: # that you can use; other things depend on this behavior.
3109: my $browsePriv = $self->{HERE}->browsePriv();
3110: if (!$self->{HERE}->src() ||
3111: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3112: return $self->next($closeAllPages);
3113: }
3114:
3115: return $self->{HERE};
3116:
3117: }
3118:
3119: =pod
3120:
3121: The other method available on the iterator is B<getStack>, which
3122: returns an array populated with the current 'stack' of maps, as
3123: references to the resource objects. Example: This is useful when
3124: making the navigation map, as we need to check whether we are under a
3125: page map to see if we need to link directly to the resource, or to the
3126: page. The first elements in the array will correspond to the top of
3127: the stack (most inclusive map).
3128:
3129: =cut
3130:
3131: sub getStack {
3132: my $self=shift;
3133:
3134: my @stack;
3135:
3136: $self->populateStack(\@stack);
3137:
3138: return \@stack;
3139: }
3140:
3141: # Private method: Calls the iterators recursively to populate the stack.
3142: sub populateStack {
3143: my $self=shift;
3144: my $stack = shift;
3145:
3146: push @$stack, $self->{HERE} if ($self->{HERE});
3147:
3148: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3149: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3150: }
3151: }
3152:
3153: 1;
3154:
3155: package Apache::lonnavmaps::DFSiterator;
3156: use WeakRef;
3157: use Apache::lonnet;
3158:
3159: # Not documented in the perldoc: This is a simple iterator that just walks
3160: # through the nav map and presents the resources in a depth-first search
3161: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3162: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3163: # useful for pre-processing of some kind, and is in fact used by the main
3164: # iterator that way, but that's about it.
3165: # One could imagine merging this into the init routine of the main iterator,
3166: # but this might as well be left separate, since it is possible some other
3167: # use might be found for it. - Jeremy
3168:
3169: # Unlike the main iterator, this DOES return all resources, even blank ones.
3170: # The main iterator needs them to correctly preprocess the map.
3171:
3172: sub BEGIN_MAP { return 1; } # begining of a new map
3173: sub END_MAP { return 2; } # end of the map
3174: sub FORWARD { return 1; } # go forward
3175: sub BACKWARD { return 2; }
3176:
3177: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3178: # filter hash ref (or undef), already seen hash or undef, condition
3179: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3180: sub new {
3181: # magic invocation to create a class instance
3182: my $proto = shift;
3183: my $class = ref($proto) || $proto;
3184: my $self = {};
3185:
3186: weaken($self->{NAV_MAP} = shift);
3187: return undef unless ($self->{NAV_MAP});
3188:
3189: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3190: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3191:
3192: # If the given resources are just the ID of the resource, get the
3193: # objects
3194: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3195: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3196: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3197: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3198:
3199: $self->{FILTER} = shift;
3200:
3201: # A hash, used as a set, of resource already seen
3202: $self->{ALREADY_SEEN} = shift;
3203: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3204: $self->{CONDITION} = shift;
3205: $self->{DIRECTION} = shift || FORWARD();
3206:
3207: # Flag: Have we started yet?
3208: $self->{STARTED} = 0;
3209:
3210: # Should we continue calling the recursive iterator, if any?
3211: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3212: # The recursive iterator, if any
3213: $self->{RECURSIVE_ITERATOR} = undef;
3214: # Are we recursing on a map, or a branch?
3215: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3216: # And the count of how deep it is, so that this iterator can keep track of
3217: # when to pick back up again.
3218: $self->{RECURSIVE_DEPTH} = 0;
3219:
3220: # For keeping track of our branches, we maintain our own stack
3221: $self->{STACK} = [];
3222:
3223: # Start with the first resource
3224: if ($self->{DIRECTION} == FORWARD) {
3225: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3226: } else {
3227: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3228: }
3229:
3230: bless($self);
3231: return $self;
3232: }
3233:
3234: sub next {
3235: my $self = shift;
3236:
3237: # Are we using a recursive iterator? If so, pull from that and
3238: # watch the depth; we want to resume our level at the correct time.
3239: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3240: # grab the next from the recursive iterator
3241: my $next = $self->{RECURSIVE_ITERATOR}->next();
3242:
3243: # is it a begin or end map? Update depth if so
3244: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3245: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3246:
3247: # Are we back at depth 0? If so, stop recursing.
3248: if ($self->{RECURSIVE_DEPTH} == 0) {
3249: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3250: }
3251:
3252: return $next;
3253: }
3254:
3255: # Is there a current resource to grab? If not, then return
3256: # END_MAP, which will end the iterator.
3257: if (scalar(@{$self->{STACK}}) == 0) {
3258: return $self->END_MAP();
3259: }
3260:
3261: # Have we not yet begun? If not, return BEGIN_MAP and
3262: # remember that we've started.
3263: if ( !$self->{STARTED} ) {
3264: $self->{STARTED} = 1;
3265: return $self->BEGIN_MAP;
3266: }
3267:
3268: # Get the next resource in the branch
3269: $self->{HERE} = pop @{$self->{STACK}};
3270:
3271: # remember that we've seen this, so we don't return it again later
3272: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3273:
3274: # Get the next possible resources
3275: my $nextUnfiltered;
3276: if ($self->{DIRECTION} == FORWARD()) {
3277: $nextUnfiltered = $self->{HERE}->getNext();
3278: } else {
3279: $nextUnfiltered = $self->{HERE}->getPrevious();
3280: }
3281: my $next = [];
3282:
3283: # filter the next possibilities to remove things we've
3284: # already seen.
3285: foreach (@$nextUnfiltered) {
3286: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3287: push @$next, $_;
3288: }
3289: }
3290:
3291: while (@$next) {
3292: # copy the next possibilities over to the stack
3293: push @{$self->{STACK}}, shift @$next;
3294: }
3295:
3296: # If this is a map and we want to recurse down it... (not filtered out)
3297: if ($self->{HERE}->is_map() &&
3298: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3299: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3300: my $firstResource = $self->{HERE}->map_start();
3301: my $finishResource = $self->{HERE}->map_finish();
3302:
3303: $self->{RECURSIVE_ITERATOR} =
3304: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3305: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3306: $self->{CONDITION}, $self->{DIRECTION});
3307: }
3308:
3309: return $self->{HERE};
3310: }
3311:
3312: # Identical to the full iterator methods of the same name. Hate to copy/paste
3313: # but I also hate to "inherit" either iterator from the other.
3314:
3315: sub getStack {
3316: my $self=shift;
3317:
3318: my @stack;
3319:
3320: $self->populateStack(\@stack);
3321:
3322: return \@stack;
3323: }
3324:
3325: # Private method: Calls the iterators recursively to populate the stack.
3326: sub populateStack {
3327: my $self=shift;
3328: my $stack = shift;
3329:
3330: push @$stack, $self->{HERE} if ($self->{HERE});
3331:
3332: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3333: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3334: }
3335: }
3336:
3337: 1;
3338:
3339: package Apache::lonnavmaps::resource;
3340: use WeakRef;
3341: use Apache::lonnet;
3342:
3343: =pod
3344:
3345: =head1 Object: resource
3346:
3347: X<resource, navmap object>
3348: A resource object encapsulates a resource in a resource map, allowing
3349: easy manipulation of the resource, querying the properties of the
3350: resource (including user properties), and represents a reference that
3351: can be used as the canonical representation of the resource by
3352: lonnavmap clients like renderers.
3353:
3354: A resource only makes sense in the context of a navmap, as some of the
3355: data is stored in the navmap object.
3356:
3357: You will probably never need to instantiate this object directly. Use
3358: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3359: starting resource.
3360:
3361: Resource objects respect the parameter_hiddenparts, which suppresses
3362: various parts according to the wishes of the map author. As of this
3363: writing, there is no way to override this parameter, and suppressed
3364: parts will never be returned, nor will their response types or ids be
3365: stored.
3366:
3367: =head2 Overview
3368:
3369: A B<Resource> is the most granular type of object in LON-CAPA that can
3370: be included in a course. It can either be a particular resource, like
3371: an HTML page, external resource, problem, etc., or it can be a
3372: container sequence, such as a "page" or a "map".
3373:
3374: To see a sequence from the user's point of view, please see the
3375: B<Creating a Course: Maps and Sequences> chapter of the Author's
3376: Manual.
3377:
3378: A Resource Object, once obtained from a navmap object via a B<getBy*>
3379: method of the navmap, or from an iterator, allows you to query
3380: information about that resource.
3381:
3382: Generally, you do not ever want to create a resource object yourself,
3383: so creation has been left undocumented. Always retrieve resources
3384: from navmap objects.
3385:
3386: =head3 Identifying Resources
3387:
3388: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3389: unique to that resource for a given course. X<resource ID, in big hash>
3390: The Resource ID has the form #.#, where the first number is the same
3391: for every resource in a map, and the second is unique. For instance,
3392: for a course laid out like this:
3393:
3394: * Problem 1
3395: * Map
3396: * Resource 2
3397: * Resource 3
3398:
3399: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3400: C<Resource 3> will share a first number. The second number may end up
3401: re-used between the two groups.
3402:
3403: The resource ID is only used in the big hash, but can be used in the
3404: context of a course to identify a resource easily. (For instance, the
3405: printing system uses it to record which resources from a sequence you
3406: wish to print.)
3407:
3408: X<symb> X<resource, symb>
3409: All resources also have B<symb>s, which uniquely identify a resource
3410: in a course. Many internal LON-CAPA functions expect a symb. A symb
3411: carries along with it the URL of the resource, and the map it appears
3412: in. Symbs are much larger then resource IDs.
3413:
3414: =cut
3415:
3416: sub new {
3417: # magic invocation to create a class instance
3418: my $proto = shift;
3419: my $class = ref($proto) || $proto;
3420: my $self = {};
3421:
3422: weaken($self->{NAV_MAP} = shift);
3423: $self->{ID} = shift;
3424:
3425: # Store this new resource in the parent nav map's cache.
3426: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3427: $self->{RESOURCE_ERROR} = 0;
3428:
3429: # A hash that can be used by two-pass algorithms to store data
3430: # about this resource in. Not used by the resource object
3431: # directly.
3432: $self->{DATA} = {};
3433:
3434: bless($self);
3435:
3436: return $self;
3437: }
3438:
3439: # private function: simplify the NAV_HASH lookups we keep doing
3440: # pass the name, and to automatically append my ID, pass a true val on the
3441: # second param
3442: sub navHash {
3443: my $self = shift;
3444: my $param = shift;
3445: my $id = shift;
3446: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3447: }
3448:
3449: =pod
3450:
3451: =head2 Methods
3452:
3453: Once you have a resource object, here's what you can do with it:
3454:
3455: =head3 Attribute Retrieval
3456:
3457: Every resource has certain attributes that can be retrieved and used:
3458:
3459: =over 4
3460:
3461: =item * B<ID>: Every resource has an ID that is unique for that
3462: resource in the course it is in. The ID is actually in the hash
3463: representing the resource, so for a resource object $res, obtain
3464: it via C<$res->{ID}).
3465:
3466: =item * B<compTitle>:
3467:
3468: Returns a "composite title", that is equal to $res->title() if the
3469: resource has a title, and is otherwise the last part of the URL (e.g.,
3470: "problem.problem").
3471:
3472: =item * B<ext>:
3473:
3474: Returns true if the resource is external.
3475:
3476: =item * B<kind>:
3477:
3478: Returns the kind of the resource from the compiled nav map.
3479:
3480: =item * B<randomout>:
3481:
3482: Returns true if this resource was chosen to NOT be shown to the user
3483: by the random map selection feature. In other words, this is usually
3484: false.
3485:
3486: =item * B<randompick>:
3487:
3488: Returns true for a map if the randompick feature is being used on the
3489: map. (?)
3490:
3491: =item * B<src>:
3492:
3493: Returns the source for the resource.
3494:
3495: =item * B<symb>:
3496:
3497: Returns the symb for the resource.
3498:
3499: =item * B<title>:
3500:
3501: Returns the title of the resource.
3502:
3503: =back
3504:
3505: =cut
3506:
3507: # These info functions can be used directly, as they don't return
3508: # resource information.
3509: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3510: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3511: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3512: sub from { my $self=shift; return $self->navHash("from_", 1); }
3513: # considered private and undocumented
3514: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3515: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3516: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3517: sub randompick {
3518: my $self = shift;
3519: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3520: '.0.parameter_randompick'};
3521: }
3522: sub link {
3523: my $self=shift;
3524: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3525: return $self->src;
3526: }
3527: sub src {
3528: my $self=shift;
3529: return $self->navHash("src_", 1);
3530: }
3531: sub shown_symb {
3532: my $self=shift;
3533: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3534: return $self->symb();
3535: }
3536: sub id {
3537: my $self=shift;
3538: return $self->{ID};
3539: }
3540: sub enclosing_map_src {
3541: my $self=shift;
3542: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3543: return $self->navHash('map_id_'.$first);
3544: }
3545: sub symb {
3546: my $self=shift;
3547: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3548: my $symbSrc = &Apache::lonnet::declutter($self->src());
3549: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3550: . '___' . $second . '___' . $symbSrc;
3551: return &Apache::lonnet::symbclean($symb);
3552: }
3553: sub wrap_symb {
3554: my $self = shift;
3555: return $self->{NAV_MAP}->wrap_symb($self->symb());
3556: }
3557: sub title {
3558: my $self=shift;
3559: if ($self->{ID} eq '0.0') {
3560: # If this is the top-level map, return the title of the course
3561: # since this map can not be titled otherwise.
3562: return $env{'course.'.$env{'request.course.id'}.'.description'};
3563: }
3564: return $self->navHash("title_", 1); }
3565: # considered private and undocumented
3566: sub to { my $self=shift; return $self->navHash("to_", 1); }
3567: sub condition {
3568: my $self=shift;
3569: my $undercond=$self->navHash("undercond_", 1);
3570: if (!defined($undercond)) { return 1; };
3571: my $condid=$self->navHash("condid_$undercond");
3572: if (!defined($condid)) { return 1; };
3573: my $condition=&Apache::lonnet::directcondval($condid);
3574: return $condition;
3575: }
3576:
3577: sub compTitle {
3578: my $self = shift;
3579: my $title = $self->title();
3580: $title=~s/\&colon\;/\:/gs;
3581: if (!$title) {
3582: $title = $self->src();
3583: $title = substr($title, rindex($title, '/') + 1);
3584: }
3585: return $title;
3586: }
3587: =pod
3588:
3589: B<Predicate Testing the Resource>
3590:
3591: These methods are shortcuts to deciding if a given resource has a given property.
3592:
3593: =over 4
3594:
3595: =item * B<is_map>:
3596:
3597: Returns true if the resource is a map type.
3598:
3599: =item * B<is_problem>:
3600:
3601: Returns true if the resource is a problem type, false
3602: otherwise. (Looks at the extension on the src field; might need more
3603: to work correctly.)
3604:
3605: =item * B<is_page>:
3606:
3607: Returns true if the resource is a page.
3608:
3609: =item * B<is_sequence>:
3610:
3611: Returns true if the resource is a sequence.
3612:
3613: =back
3614:
3615: =cut
3616:
3617: sub hasResource {
3618: my $self = shift;
3619: return $self->{NAV_MAP}->hasResource(@_);
3620: }
3621:
3622: sub retrieveResources {
3623: my $self = shift;
3624: return $self->{NAV_MAP}->retrieveResources(@_);
3625: }
3626:
3627: sub is_html {
3628: my $self=shift;
3629: my $src = $self->src();
3630: return ($src =~ /html$/);
3631: }
3632: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3633: sub is_page {
3634: my $self=shift;
3635: my $src = $self->src();
3636: return $self->navHash("is_map_", 1) &&
3637: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3638: }
3639: sub is_problem {
3640: my $self=shift;
3641: my $src = $self->src();
3642: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/)
3643: }
3644: sub contains_problem {
3645: my $self=shift;
3646: if ($self->is_page()) {
3647: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3648: return $hasProblem;
3649: }
3650: return 0;
3651: }
3652: sub is_sequence {
3653: my $self=shift;
3654: my $src = $self->src();
3655: return $self->navHash("is_map_", 1) &&
3656: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3657: }
3658: sub is_survey {
3659: my $self = shift();
3660: my $part = shift();
3661: if ($self->parmval('type',$part) eq 'survey') {
3662: return 1;
3663: }
3664: if ($self->src() =~ /\.(survey)$/) {
3665: return 1;
3666: }
3667: return 0;
3668: }
3669:
3670: sub is_empty_sequence {
3671: my $self=shift;
3672: my $src = $self->src();
3673: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3674: }
3675:
3676: # Private method: Shells out to the parmval in the nav map, handler parts.
3677: sub parmval {
3678: my $self = shift;
3679: my $what = shift;
3680: my $part = shift;
3681: if (!defined($part)) {
3682: $part = '0';
3683: }
3684: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3685: }
3686:
3687: =pod
3688:
3689: B<Map Methods>
3690:
3691: These methods are useful for getting information about the map
3692: properties of the resource, if the resource is a map (B<is_map>).
3693:
3694: =over 4
3695:
3696: =item * B<map_finish>:
3697:
3698: Returns a reference to a resource object corresponding to the finish
3699: resource of the map.
3700:
3701: =item * B<map_pc>:
3702:
3703: Returns the pc value of the map, which is the first number that
3704: appears in the resource ID of the resources in the map, and is the
3705: number that appears around the middle of the symbs of the resources in
3706: that map.
3707:
3708: =item * B<map_start>:
3709:
3710: Returns a reference to a resource object corresponding to the start
3711: resource of the map.
3712:
3713: =item * B<map_type>:
3714:
3715: Returns a string with the type of the map in it.
3716:
3717: =back
3718:
3719: =cut
3720:
3721: sub map_finish {
3722: my $self = shift;
3723: my $src = $self->src();
3724: $src = Apache::lonnet::clutter($src);
3725: my $res = $self->navHash("map_finish_$src", 0);
3726: $res = $self->{NAV_MAP}->getById($res);
3727: return $res;
3728: }
3729: sub map_pc {
3730: my $self = shift;
3731: my $src = $self->src();
3732: return $self->navHash("map_pc_$src", 0);
3733: }
3734: sub map_start {
3735: my $self = shift;
3736: my $src = $self->src();
3737: $src = Apache::lonnet::clutter($src);
3738: my $res = $self->navHash("map_start_$src", 0);
3739: $res = $self->{NAV_MAP}->getById($res);
3740: return $res;
3741: }
3742: sub map_type {
3743: my $self = shift;
3744: my $pc = $self->map_pc();
3745: return $self->navHash("map_type_$pc", 0);
3746: }
3747:
3748: #####
3749: # Property queries
3750: #####
3751:
3752: # These functions will be responsible for returning the CORRECT
3753: # VALUE for the parameter, no matter what. So while they may look
3754: # like direct calls to parmval, they can be more then that.
3755: # So, for instance, the duedate function should use the "duedatetype"
3756: # information, rather then the resource object user.
3757:
3758: =pod
3759:
3760: =head2 Resource Parameters
3761:
3762: In order to use the resource parameters correctly, the nav map must
3763: have been instantiated with genCourseAndUserOptions set to true, so
3764: the courseopt and useropt is read correctly. Then, you can call these
3765: functions to get the relevant parameters for the resource. Each
3766: function defaults to part "0", but can be directed to another part by
3767: passing the part as the parameter.
3768:
3769: These methods are responsible for getting the parameter correct, not
3770: merely reflecting the contents of the GDBM hashes. As we move towards
3771: dates relative to other dates, these methods should be updated to
3772: reflect that. (Then, anybody using these methods will not have to update
3773: their code.)
3774:
3775: =over 4
3776:
3777: =item * B<acc>:
3778:
3779: Get the Client IP/Name Access Control information.
3780:
3781: =item * B<answerdate>:
3782:
3783: Get the answer-reveal date for the problem.
3784:
3785: =item * B<awarded>:
3786:
3787: Gets the awarded value for the problem part. Requires genUserData set to
3788: true when the navmap object was created.
3789:
3790: =item * B<duedate>:
3791:
3792: Get the due date for the problem.
3793:
3794: =item * B<tries>:
3795:
3796: Get the number of tries the student has used on the problem.
3797:
3798: =item * B<maxtries>:
3799:
3800: Get the number of max tries allowed.
3801:
3802: =item * B<opendate>:
3803:
3804: Get the open date for the problem.
3805:
3806: =item * B<sig>:
3807:
3808: Get the significant figures setting.
3809:
3810: =item * B<tol>:
3811:
3812: Get the tolerance for the problem.
3813:
3814: =item * B<tries>:
3815:
3816: Get the number of tries the user has already used on the problem.
3817:
3818: =item * B<type>:
3819:
3820: Get the question type for the problem.
3821:
3822: =item * B<weight>:
3823:
3824: Get the weight for the problem.
3825:
3826: =back
3827:
3828: =cut
3829:
3830: sub acc {
3831: (my $self, my $part) = @_;
3832: return $self->parmval("acc", $part);
3833: }
3834: sub answerdate {
3835: (my $self, my $part) = @_;
3836: # Handle intervals
3837: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3838: return $self->duedate($part) +
3839: $self->parmval("answerdate", $part);
3840: }
3841: return $self->parmval("answerdate", $part);
3842: }
3843: sub awarded {
3844: my $self = shift; my $part = shift;
3845: $self->{NAV_MAP}->get_user_data();
3846: if (!defined($part)) { $part = '0'; }
3847: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3848: }
3849: sub duedate {
3850: (my $self, my $part) = @_;
3851: my $interval=$self->parmval("interval", $part);
3852: if ($interval) {
3853: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3854: if ($first_access) { return ($first_access+$interval); }
3855: }
3856: return $self->parmval("duedate", $part);
3857: }
3858: sub handgrade {
3859: (my $self, my $part) = @_;
3860: return $self->parmval("handgrade", $part);
3861: }
3862: sub maxtries {
3863: (my $self, my $part) = @_;
3864: return $self->parmval("maxtries", $part);
3865: }
3866: sub opendate {
3867: (my $self, my $part) = @_;
3868: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3869: return $self->duedate($part) -
3870: $self->parmval("opendate", $part);
3871: }
3872: return $self->parmval("opendate");
3873: }
3874: sub problemstatus {
3875: (my $self, my $part) = @_;
3876: return lc $self->parmval("problemstatus", $part);
3877: }
3878: sub sig {
3879: (my $self, my $part) = @_;
3880: return $self->parmval("sig", $part);
3881: }
3882: sub tol {
3883: (my $self, my $part) = @_;
3884: return $self->parmval("tol", $part);
3885: }
3886: sub tries {
3887: my $self = shift;
3888: my $tries = $self->queryRestoreHash('tries', shift);
3889: if (!defined($tries)) { return '0';}
3890: return $tries;
3891: }
3892: sub type {
3893: (my $self, my $part) = @_;
3894: return $self->parmval("type", $part);
3895: }
3896: sub weight {
3897: my $self = shift; my $part = shift;
3898: if (!defined($part)) { $part = '0'; }
3899: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3900: $self->symb(), $env{'user.domain'},
3901: $env{'user.name'},
3902: $env{'request.course.sec'});
3903: }
3904: sub part_display {
3905: my $self= shift(); my $partID = shift();
3906: if (! defined($partID)) { $partID = '0'; }
3907: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3908: $self->symb);
3909: if (! defined($display) || $display eq '') {
3910: $display = $partID;
3911: }
3912: return $display;
3913: }
3914:
3915: # Multiple things need this
3916: sub getReturnHash {
3917: my $self = shift;
3918:
3919: if (!defined($self->{RETURN_HASH})) {
3920: my %tmpHash = &Apache::lonnet::restore($self->symb());
3921: $self->{RETURN_HASH} = \%tmpHash;
3922: }
3923: }
3924:
3925: ######
3926: # Status queries
3927: ######
3928:
3929: # These methods query the status of problems.
3930:
3931: # If we need to count parts, this function determines the number of
3932: # parts from the metadata. When called, it returns a reference to a list
3933: # of strings corresponding to the parts. (Thus, using it in a scalar context
3934: # tells you how many parts you have in the problem:
3935: # $partcount = scalar($resource->countParts());
3936: # Don't use $self->{PARTS} directly because you don't know if it's been
3937: # computed yet.
3938:
3939: =pod
3940:
3941: =head2 Resource misc
3942:
3943: Misc. functions for the resource.
3944:
3945: =over 4
3946:
3947: =item * B<hasDiscussion>:
3948:
3949: Returns a false value if there has been discussion since the user last
3950: logged in, true if there has. Always returns false if the discussion
3951: data was not extracted when the nav map was constructed.
3952:
3953: =item * B<getFeedback>:
3954:
3955: Gets the feedback for the resource and returns the raw feedback string
3956: for the resource, or the null string if there is no feedback or the
3957: email data was not extracted when the nav map was constructed. Usually
3958: used like this:
3959:
3960: for (split(/\,/, $res->getFeedback())) {
3961: my $link = &Apache::lonnet::escape($_);
3962: ...
3963:
3964: and use the link as appropriate.
3965:
3966: =cut
3967:
3968: sub hasDiscussion {
3969: my $self = shift;
3970: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3971: }
3972:
3973: sub getFeedback {
3974: my $self = shift;
3975: my $source = $self->src();
3976: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3977: return $self->{NAV_MAP}->getFeedback($source);
3978: }
3979:
3980: sub getErrors {
3981: my $self = shift;
3982: my $source = $self->src();
3983: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3984: return $self->{NAV_MAP}->getErrors($source);
3985: }
3986:
3987: =pod
3988:
3989: =item * B<parts>():
3990:
3991: Returns a list reference containing sorted strings corresponding to
3992: each part of the problem. Single part problems have only a part '0'.
3993: Multipart problems do not return their part '0', since they typically
3994: do not really matter.
3995:
3996: =item * B<countParts>():
3997:
3998: Returns the number of parts of the problem a student can answer. Thus,
3999: for single part problems, returns 1. For multipart, it returns the
4000: number of parts in the problem, not including psuedo-part 0.
4001:
4002: =item * B<countResponses>():
4003:
4004: Returns the total number of responses in the problem a student can answer.
4005:
4006: =item * B<responseTypes>():
4007:
4008: Returns a hash whose keys are the response types. The values are the number
4009: of times each response type is used. This is for the I<entire> problem, not
4010: just a single part.
4011:
4012: =item * B<multipart>():
4013:
4014: Returns true if the problem is multipart, false otherwise. Use this instead
4015: of countParts if all you want is multipart/not multipart.
4016:
4017: =item * B<responseType>($part):
4018:
4019: Returns the response type of the part, without the word "response" on the
4020: end. Example return values: 'string', 'essay', 'numeric', etc.
4021:
4022: =item * B<responseIds>($part):
4023:
4024: Retreives the response IDs for the given part as an array reference containing
4025: strings naming the response IDs. This may be empty.
4026:
4027: =back
4028:
4029: =cut
4030:
4031: sub parts {
4032: my $self = shift;
4033:
4034: if ($self->ext) { return []; }
4035:
4036: $self->extractParts();
4037: return $self->{PARTS};
4038: }
4039:
4040: sub countParts {
4041: my $self = shift;
4042:
4043: my $parts = $self->parts();
4044:
4045: # If I left this here, then it's not necessary.
4046: #my $delta = 0;
4047: #for my $part (@$parts) {
4048: # if ($part eq '0') { $delta--; }
4049: #}
4050:
4051: if ($self->{RESOURCE_ERROR}) {
4052: return 0;
4053: }
4054:
4055: return scalar(@{$parts}); # + $delta;
4056: }
4057:
4058: sub countResponses {
4059: my $self = shift;
4060: my $count;
4061: foreach my $part (@{$self->parts()}) {
4062: $count+= scalar($self->responseIds($part));
4063: }
4064: return $count;
4065: }
4066:
4067: sub responseTypes {
4068: my $self = shift;
4069: my %responses;
4070: foreach my $part ($self->parts()) {
4071: foreach my $responsetype ($self->responseType($part)) {
4072: $responses{$responsetype}++ if (defined($responsetype));
4073: }
4074: }
4075: return %responses;
4076: }
4077:
4078: sub multipart {
4079: my $self = shift;
4080: return $self->countParts() > 1;
4081: }
4082:
4083: sub singlepart {
4084: my $self = shift;
4085: return $self->countParts() == 1;
4086: }
4087:
4088: sub responseType {
4089: my $self = shift;
4090: my $part = shift;
4091:
4092: $self->extractParts();
4093: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4094: return @{$self->{RESPONSE_TYPES}->{$part}};
4095: } else {
4096: return undef;
4097: }
4098: }
4099:
4100: sub responseIds {
4101: my $self = shift;
4102: my $part = shift;
4103:
4104: $self->extractParts();
4105: if (defined($self->{RESPONSE_IDS}->{$part})) {
4106: return @{$self->{RESPONSE_IDS}->{$part}};
4107: } else {
4108: return undef;
4109: }
4110: }
4111:
4112: # Private function: Extracts the parts information, both part names and
4113: # part types, and saves it.
4114: sub extractParts {
4115: my $self = shift;
4116:
4117: return if (defined($self->{PARTS}));
4118: return if ($self->ext);
4119:
4120: $self->{PARTS} = [];
4121:
4122: my %parts;
4123:
4124: # Retrieve part count, if this is a problem
4125: if ($self->is_problem()) {
4126: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4127: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4128:
4129: if ($partorder) {
4130: my @parts;
4131: for my $part (split (/,/,$partorder)) {
4132: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4133: push @parts, $part;
4134: $parts{$part} = 1;
4135: }
4136: }
4137: $self->{PARTS} = \@parts;
4138: } else {
4139: if (!$metadata) {
4140: $self->{RESOURCE_ERROR} = 1;
4141: $self->{PARTS} = [];
4142: $self->{PART_TYPE} = {};
4143: return;
4144: }
4145: foreach (split(/\,/,$metadata)) {
4146: if ($_ =~ /^(?:part|Task)_(.*)$/) {
4147: my $part = $1;
4148: # This floods the logs if it blows up
4149: if (defined($parts{$part})) {
4150: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4151: }
4152:
4153: # check to see if part is turned off.
4154:
4155: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4156: $parts{$part} = 1;
4157: }
4158: }
4159: }
4160: my @sortedParts = sort keys %parts;
4161: $self->{PARTS} = \@sortedParts;
4162: }
4163:
4164:
4165: # These hashes probably do not need names that end with "Hash"....
4166: my %responseIdHash;
4167: my %responseTypeHash;
4168:
4169:
4170: # Init the responseIdHash
4171: foreach (@{$self->{PARTS}}) {
4172: $responseIdHash{$_} = [];
4173: }
4174:
4175: # Now, the unfortunate thing about this is that parts, part name, and
4176: # response id are delimited by underscores, but both the part
4177: # name and response id can themselves have underscores in them.
4178: # So we have to use our knowlege of part names to figure out
4179: # where the part names begin and end, and even then, it is possible
4180: # to construct ambiguous situations.
4181: foreach (split /,/, $metadata) {
4182: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4183: my $responseType = $1;
4184: my $partStuff = $2;
4185: my $partIdSoFar = '';
4186: my @partChunks = split /_/, $partStuff;
4187: my $i = 0;
4188: for ($i = 0; $i < scalar(@partChunks); $i++) {
4189: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4190: $partIdSoFar .= $partChunks[$i];
4191: if ($parts{$partIdSoFar}) {
4192: my @otherChunks = @partChunks[$i+1..$#partChunks];
4193: my $responseId = join('_', @otherChunks);
4194: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4195: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4196: }
4197: }
4198: }
4199: }
4200: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4201: #
4202: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4203: if ($resorder) {
4204: my @resorder=split(/,/,$resorder);
4205: foreach my $part (keys(%responseIdHash)) {
4206: my $i=0;
4207: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4208: my @neworder;
4209: foreach my $possibleid (@resorder) {
4210: if (exists($resids{$possibleid})) {
4211: push(@neworder,$resids{$possibleid});
4212: }
4213: }
4214: my @ids;
4215: my @type;
4216: foreach my $element (@neworder) {
4217: push (@ids,$responseIdHash{$part}->[$element]);
4218: push (@type,$responseTypeHash{$part}->[$element]);
4219: }
4220: $responseIdHash{$part}=\@ids;
4221: $responseTypeHash{$part}=\@type;
4222: }
4223: }
4224: $self->{RESPONSE_IDS} = \%responseIdHash;
4225: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4226: }
4227:
4228: return;
4229: }
4230:
4231: =pod
4232:
4233: =head2 Resource Status
4234:
4235: Problem resources have status information, reflecting their various
4236: dates and completion statuses.
4237:
4238: There are two aspects to the status: the date-related information and
4239: the completion information.
4240:
4241: Idiomatic usage of these two methods would probably look something
4242: like
4243:
4244: foreach ($resource->parts()) {
4245: my $dateStatus = $resource->getDateStatus($_);
4246: my $completionStatus = $resource->getCompletionStatus($_);
4247:
4248: or
4249:
4250: my $status = $resource->status($_);
4251:
4252: ... use it here ...
4253: }
4254:
4255: Which you use depends on exactly what you are looking for. The
4256: status() function has been optimized for the nav maps display and may
4257: not precisely match what you need elsewhere.
4258:
4259: The symbolic constants shown below can be accessed through the
4260: resource object: C<$res->OPEN>.
4261:
4262: =over 4
4263:
4264: =item * B<getDateStatus>($part):
4265:
4266: ($part defaults to 0). A convenience function that returns a symbolic
4267: constant telling you about the date status of the part. The possible
4268: return values are:
4269:
4270: =back
4271:
4272: B<Date Codes>
4273:
4274: =over 4
4275:
4276: =item * B<OPEN_LATER>:
4277:
4278: The problem will be opened later.
4279:
4280: =item * B<OPEN>:
4281:
4282: Open and not yet due.
4283:
4284:
4285: =item * B<PAST_DUE_ANSWER_LATER>:
4286:
4287: The due date has passed, but the answer date has not yet arrived.
4288:
4289: =item * B<PAST_DUE_NO_ANSWER>:
4290:
4291: The due date has passed and there is no answer opening date set.
4292:
4293: =item * B<ANSWER_OPEN>:
4294:
4295: The answer date is here.
4296:
4297: =item * B<NETWORK_FAILURE>:
4298:
4299: The information is unknown due to network failure.
4300:
4301: =back
4302:
4303: =cut
4304:
4305: # Apparently the compiler optimizes these into constants automatically
4306: sub OPEN_LATER { return 0; }
4307: sub OPEN { return 1; }
4308: sub PAST_DUE_NO_ANSWER { return 2; }
4309: sub PAST_DUE_ANSWER_LATER { return 3; }
4310: sub ANSWER_OPEN { return 4; }
4311: sub NOTHING_SET { return 5; }
4312: sub NETWORK_FAILURE { return 100; }
4313:
4314: # getDateStatus gets the date status for a given problem part.
4315: # Because answer date, due date, and open date are fully independent
4316: # (i.e., it is perfectly possible to *only* have an answer date),
4317: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4318: # (past, future, none given). This function handles this with a decision
4319: # tree. Read the comments to follow the decision tree.
4320:
4321: sub getDateStatus {
4322: my $self = shift;
4323: my $part = shift;
4324: $part = "0" if (!defined($part));
4325:
4326: # Always return network failure if there was one.
4327: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4328:
4329: my $now = time();
4330:
4331: my $open = $self->opendate($part);
4332: my $due = $self->duedate($part);
4333: my $answer = $self->answerdate($part);
4334:
4335: if (!$open && !$due && !$answer) {
4336: # no data on the problem at all
4337: # should this be the same as "open later"? think multipart.
4338: return $self->NOTHING_SET;
4339: }
4340: if (!$open || $now < $open) {return $self->OPEN_LATER}
4341: if (!$due || $now < $due) {return $self->OPEN}
4342: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4343: if ($answer) { return $self->ANSWER_OPEN; }
4344: return PAST_DUE_NO_ANSWER;
4345: }
4346:
4347: =pod
4348:
4349: B<>
4350:
4351: =over 4
4352:
4353: =item * B<getCompletionStatus>($part):
4354:
4355: ($part defaults to 0.) A convenience function that returns a symbolic
4356: constant telling you about the completion status of the part, with the
4357: following possible results:
4358:
4359: =back
4360:
4361: B<Completion Codes>
4362:
4363: =over 4
4364:
4365: =item * B<NOT_ATTEMPTED>:
4366:
4367: Has not been attempted at all.
4368:
4369: =item * B<INCORRECT>:
4370:
4371: Attempted, but wrong by student.
4372:
4373: =item * B<INCORRECT_BY_OVERRIDE>:
4374:
4375: Attempted, but wrong by instructor override.
4376:
4377: =item * B<CORRECT>:
4378:
4379: Correct or correct by instructor.
4380:
4381: =item * B<CORRECT_BY_OVERRIDE>:
4382:
4383: Correct by instructor override.
4384:
4385: =item * B<EXCUSED>:
4386:
4387: Excused. Not yet implemented.
4388:
4389: =item * B<NETWORK_FAILURE>:
4390:
4391: Information not available due to network failure.
4392:
4393: =item * B<ATTEMPTED>:
4394:
4395: Attempted, and not yet graded.
4396:
4397: =back
4398:
4399: =cut
4400:
4401: sub NOT_ATTEMPTED { return 10; }
4402: sub INCORRECT { return 11; }
4403: sub INCORRECT_BY_OVERRIDE { return 12; }
4404: sub CORRECT { return 13; }
4405: sub CORRECT_BY_OVERRIDE { return 14; }
4406: sub EXCUSED { return 15; }
4407: sub ATTEMPTED { return 16; }
4408:
4409: sub getCompletionStatus {
4410: my $self = shift;
4411: my $part = shift;
4412: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4413:
4414: my $status = $self->queryRestoreHash('solved', $part);
4415:
4416: # Left as separate if statements in case we ever do more with this
4417: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4418: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4419: if ($status eq 'correct_by_override') {
4420: return $self->CORRECT_BY_OVERRIDE;
4421: }
4422: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4423: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4424: if ($status eq 'excused') {return $self->EXCUSED; }
4425: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4426: return $self->NOT_ATTEMPTED;
4427: }
4428:
4429: sub queryRestoreHash {
4430: my $self = shift;
4431: my $hashentry = shift;
4432: my $part = shift;
4433: $part = "0" if (!defined($part) || $part eq '');
4434: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4435:
4436: $self->getReturnHash();
4437:
4438: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4439: }
4440:
4441: =pod
4442:
4443: B<Composite Status>
4444:
4445: Along with directly returning the date or completion status, the
4446: resource object includes a convenience function B<status>() that will
4447: combine the two status tidbits into one composite status that can
4448: represent the status of the resource as a whole. This method represents
4449: the concept of the thing we want to display to the user on the nav maps
4450: screen, which is a combination of completion and open status. The precise logic is
4451: documented in the comments of the status method. The following results
4452: may be returned, all available as methods on the resource object
4453: ($res->NETWORK_FAILURE): In addition to the return values that match
4454: the date or completion status, this function can return "ANSWER_SUBMITTED"
4455: if that problemstatus parameter value is set to No, suppressing the
4456: incorrect/correct feedback.
4457:
4458: =over 4
4459:
4460: =item * B<NETWORK_FAILURE>:
4461:
4462: The network has failed and the information is not available.
4463:
4464: =item * B<NOTHING_SET>:
4465:
4466: No dates have been set for this problem (part) at all. (Because only
4467: certain parts of a multi-part problem may be assigned, this can not be
4468: collapsed into "open later", as we do not know a given part will EVER
4469: be opened. For single part, this is the same as "OPEN_LATER".)
4470:
4471: =item * B<CORRECT>:
4472:
4473: For any reason at all, the part is considered correct.
4474:
4475: =item * B<EXCUSED>:
4476:
4477: For any reason at all, the problem is excused.
4478:
4479: =item * B<PAST_DUE_NO_ANSWER>:
4480:
4481: The problem is past due, not considered correct, and no answer date is
4482: set.
4483:
4484: =item * B<PAST_DUE_ANSWER_LATER>:
4485:
4486: The problem is past due, not considered correct, and an answer date in
4487: the future is set.
4488:
4489: =item * B<ANSWER_OPEN>:
4490:
4491: The problem is past due, not correct, and the answer is now available.
4492:
4493: =item * B<OPEN_LATER>:
4494:
4495: The problem is not yet open.
4496:
4497: =item * B<TRIES_LEFT>:
4498:
4499: The problem is open, has been tried, is not correct, but there are
4500: tries left.
4501:
4502: =item * B<INCORRECT>:
4503:
4504: The problem is open, and all tries have been used without getting the
4505: correct answer.
4506:
4507: =item * B<OPEN>:
4508:
4509: The item is open and not yet tried.
4510:
4511: =item * B<ATTEMPTED>:
4512:
4513: The problem has been attempted.
4514:
4515: =item * B<ANSWER_SUBMITTED>:
4516:
4517: An answer has been submitted, but the student should not see it.
4518:
4519: =back
4520:
4521: =cut
4522:
4523: sub TRIES_LEFT { return 20; }
4524: sub ANSWER_SUBMITTED { return 21; }
4525: sub PARTIALLY_CORRECT{ return 22; }
4526:
4527: sub status {
4528: my $self = shift;
4529: my $part = shift;
4530: if (!defined($part)) { $part = "0"; }
4531: my $completionStatus = $self->getCompletionStatus($part);
4532: my $dateStatus = $self->getDateStatus($part);
4533:
4534: # What we have is a two-dimensional matrix with 4 entries on one
4535: # dimension and 5 entries on the other, which we want to colorize,
4536: # plus network failure and "no date data at all".
4537:
4538: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4539: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4540:
4541: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4542: # If there's an answer date and we're past it, don't
4543: # suppress the feedback; student should know
4544: if ($self->duedate($part) && $self->duedate($part) < time() &&
4545: $self->answerdate($part) && $self->answerdate($part) < time()) {
4546: $suppressFeedback = 0;
4547: }
4548:
4549: # There are a few whole rows we can dispose of:
4550: if ($completionStatus == CORRECT ||
4551: $completionStatus == CORRECT_BY_OVERRIDE ) {
4552: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4553: my $awarded=$self->awarded($part);
4554: if ($awarded < 1 && $awarded > 0) {
4555: return PARTIALLY_CORRECT;
4556: } elsif ($awarded<1) {
4557: return INCORRECT;
4558: }
4559: return CORRECT;
4560: }
4561:
4562: if ($completionStatus == ATTEMPTED) {
4563: return ATTEMPTED;
4564: }
4565:
4566: # If it's EXCUSED, then return that no matter what
4567: if ($completionStatus == EXCUSED) {
4568: return EXCUSED;
4569: }
4570:
4571: if ($dateStatus == NOTHING_SET) {
4572: return NOTHING_SET;
4573: }
4574:
4575: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4576: # by 4 matrix (date statuses).
4577:
4578: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4579: $dateStatus == PAST_DUE_NO_ANSWER ) {
4580: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4581: }
4582:
4583: if ($dateStatus == ANSWER_OPEN) {
4584: return ANSWER_OPEN;
4585: }
4586:
4587: # Now: (incorrect, incorrect_override, not_attempted) x
4588: # (open_later), (open)
4589:
4590: if ($dateStatus == OPEN_LATER) {
4591: return OPEN_LATER;
4592: }
4593:
4594: # If it's WRONG...
4595: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4596: # and there are TRIES LEFT:
4597: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4598: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4599: }
4600: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4601: }
4602:
4603: # Otherwise, it's untried and open
4604: return OPEN;
4605: }
4606:
4607: sub CLOSED { return 23; }
4608: sub ERROR { return 24; }
4609:
4610: =pod
4611:
4612: B<Simple Status>
4613:
4614: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4615: "Simple status" corresponds to "which icon is shown on the
4616: Navmaps". There are six "simple" statuses:
4617:
4618: =over 4
4619:
4620: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4621:
4622: =item * B<OPEN>: The problem is open and unattempted.
4623:
4624: =item * B<CORRECT>: The problem is correct for any reason.
4625:
4626: =item * B<INCORRECT>: The problem is incorrect and can still be
4627: completed successfully.
4628:
4629: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4630: does not know if they are correct. (The ellipsis icon.)
4631:
4632: =item * B<ERROR>: There is an error retrieving information about this
4633: problem.
4634:
4635: =back
4636:
4637: =cut
4638:
4639: # This hash maps the composite status to this simple status, and
4640: # can be used directly, if you like
4641: my %compositeToSimple =
4642: (
4643: NETWORK_FAILURE() => ERROR,
4644: NOTHING_SET() => CLOSED,
4645: CORRECT() => CORRECT,
4646: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4647: EXCUSED() => CORRECT,
4648: PAST_DUE_NO_ANSWER() => INCORRECT,
4649: PAST_DUE_ANSWER_LATER() => INCORRECT,
4650: ANSWER_OPEN() => INCORRECT,
4651: OPEN_LATER() => CLOSED,
4652: TRIES_LEFT() => OPEN,
4653: INCORRECT() => INCORRECT,
4654: OPEN() => OPEN,
4655: ATTEMPTED() => ATTEMPTED,
4656: ANSWER_SUBMITTED() => ATTEMPTED
4657: );
4658:
4659: sub simpleStatus {
4660: my $self = shift;
4661: my $part = shift;
4662: my $status = $self->status($part);
4663: return $compositeToSimple{$status};
4664: }
4665:
4666: =pod
4667:
4668: B<simpleStatusCount> will return an array reference containing, in
4669: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4670: and ERROR parts the given problem has.
4671:
4672: =cut
4673:
4674: # This maps the status to the slot we want to increment
4675: my %statusToSlotMap =
4676: (
4677: OPEN() => 0,
4678: CLOSED() => 1,
4679: CORRECT() => 2,
4680: INCORRECT() => 3,
4681: ATTEMPTED() => 4,
4682: ERROR() => 5
4683: );
4684:
4685: sub statusToSlot { return $statusToSlotMap{shift()}; }
4686:
4687: sub simpleStatusCount {
4688: my $self = shift;
4689:
4690: my @counts = (0, 0, 0, 0, 0, 0, 0);
4691: foreach my $part (@{$self->parts()}) {
4692: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4693: }
4694:
4695: return \@counts;
4696: }
4697:
4698: =pod
4699:
4700: B<Completable>
4701:
4702: The completable method represents the concept of I<whether the student can
4703: currently do the problem>. If the student can do the problem, which means
4704: that it is open, there are tries left, and if the problem is manually graded
4705: or the grade is suppressed via problemstatus, the student has not tried it
4706: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4707: either the student has tried it and there is no feedback, or that for
4708: some reason it is no longer completable (not open yet, successfully completed,
4709: out of tries, etc.). As an example, this is used as the filter for the
4710: "Uncompleted Homework" option for the nav maps.
4711:
4712: If this does not quite meet your needs, do not fiddle with it (unless you are
4713: fixing it to better match the student's conception of "completable" because
4714: it's broken somehow)... make a new method.
4715:
4716: =cut
4717:
4718: sub completable {
4719: my $self = shift;
4720: if (!$self->is_problem()) { return 0; }
4721: my $partCount = $self->countParts();
4722:
4723: foreach my $part (@{$self->parts()}) {
4724: if ($part eq '0' && $partCount != 1) { next; }
4725: my $status = $self->status($part);
4726: # "If any of the parts are open, or have tries left (implies open),
4727: # and it is not "attempted" (manually graded problem), it is
4728: # not "complete"
4729: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4730: $status == ANSWER_SUBMITTED() ) {
4731: # did this part already, as well as we can
4732: next;
4733: }
4734: if ($status == OPEN() || $status == TRIES_LEFT()) {
4735: return 1;
4736: }
4737: }
4738:
4739: # If all the parts were complete, so was this problem.
4740: return 0;
4741: }
4742:
4743: =pod
4744:
4745: =head2 Resource/Nav Map Navigation
4746:
4747: =over 4
4748:
4749: =item * B<getNext>():
4750:
4751: Retreive an array of the possible next resources after this
4752: one. Always returns an array, even in the one- or zero-element case.
4753:
4754: =item * B<getPrevious>():
4755:
4756: Retreive an array of the possible previous resources from this
4757: one. Always returns an array, even in the one- or zero-element case.
4758:
4759: =cut
4760:
4761: sub getNext {
4762: my $self = shift;
4763: my @branches;
4764: my $to = $self->to();
4765: foreach my $branch ( split(/,/, $to) ) {
4766: my $choice = $self->{NAV_MAP}->getById($branch);
4767: if (!$choice->condition()) { next; }
4768: my $next = $choice->goesto();
4769: $next = $self->{NAV_MAP}->getById($next);
4770:
4771: push @branches, $next;
4772: }
4773: return \@branches;
4774: }
4775:
4776: sub getPrevious {
4777: my $self = shift;
4778: my @branches;
4779: my $from = $self->from();
4780: foreach my $branch ( split /,/, $from) {
4781: my $choice = $self->{NAV_MAP}->getById($branch);
4782: my $prev = $choice->comesfrom();
4783: $prev = $self->{NAV_MAP}->getById($prev);
4784:
4785: push @branches, $prev;
4786: }
4787: return \@branches;
4788: }
4789:
4790: sub browsePriv {
4791: my $self = shift;
4792: if (defined($self->{BROWSE_PRIV})) {
4793: return $self->{BROWSE_PRIV};
4794: }
4795:
4796: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4797: $self->symb());
4798: }
4799:
4800: =pod
4801:
4802: =back
4803:
4804: =cut
4805:
4806: 1;
4807:
4808: __END__
4809:
4810:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonnavmaps.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / interface