1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.349.2.2 2005/12/05 21:37:19 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($r);
174:
175: my %toplinkitems=();
176: &add_linkitem(\%toplinkitems,'blank','',"Select Action");
177: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
178: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
179: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
180: my $menu=&Apache::lonmenu::reopenmenu();
181: my $navstatus=&Apache::lonmenu::get_nav_status();
182: if ($menu) {
183: $menu=(<<MENU)
184: swmenu=$menu
185: swmenu.clearTimeout(swmenu.menucltim);
186: $navstatus
187: MENU
188: } else {
189: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
190: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
191: $menu=(<<MENU)
192: swmenu=$mainwindow
193: $navstatus
194: MENU
195: }
196: $r->send_http_header;
197: my $html=&Apache::lonxml::xmlbegin();
198: $r->print(<<"ENDSUBM");
199: $html
200: <head>
201: <script type="text/javascript">
202: function submitthis() {
203: $menu
204: self.close();
205: }
206:
207: </script>
208: </head>
209: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
210: </html>
211: ENDSUBM
212: return OK;
213: }
214: if ($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: $r->send_http_header;
242: my $html=&Apache::lonxml::xmlbegin();
243: $r->print("$html<head>\n");
244: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
245: # ------------------------------------------------------------ Get query string
246: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework','postsymb']);
247:
248: # ----------------------------------------------------- Force menu registration
249: my $addentries='';
250: my $more_unload;
251: my $body_only='';
252: if ($env{'environment.remotenavmap'} eq 'on') {
253: $r->print('<script type="text/javascript">
254: function collapse() {
255: this.document.location="/adm/navmaps?collapseExternal";
256: }
257: </script>');
258: # FIXME need to be smarter to only catch window close events
259: # $more_unload="collapse()"
260: $body_only=1;
261: }
262: if ($env{'form.register'}) {
263: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
264: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
265: $more_unload.'"';
266: $r->print(&Apache::lonmenu::registerurl(1));
267: } else {
268: $addentries=' onUnload="'.$more_unload.'"';
269: }
270:
271: # Header
272: $r->print('</head>'.
273: &Apache::loncommon::bodytag('Navigate Course Contents','',
274: $addentries,$body_only,'',
275: $env{'form.register'}));
276: $r->print('<script>window.focus();</script>');
277:
278: $r->rflush();
279:
280: # Check that it's defined
281: if (!($navmap->courseMapDefined())) {
282: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
283: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
284: '</body></html>');
285: return OK;
286: }
287:
288: # See if there's only one map in the top-level, if we don't
289: # already have a filter... if so, automatically display it
290: # (older code; should use retrieveResources)
291: if ($ENV{QUERY_STRING} !~ /filter/) {
292: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
293: my $curRes;
294: my $sequenceCount = 0;
295: my $sequenceId;
296: while ($curRes = $iterator->next()) {
297: if (ref($curRes) && $curRes->is_sequence()) {
298: $sequenceCount++;
299: $sequenceId = $curRes->map_pc();
300: }
301: }
302:
303: if ($sequenceCount == 1) {
304: # The automatic iterator creation in the render call
305: # will pick this up. We know the condition because
306: # the defined($env{'form.filter'}) also ensures this
307: # is a fresh call.
308: $env{'form.filter'} = "$sequenceId";
309: }
310: }
311:
312: if ($ENV{QUERY_STRING} eq 'launchExternal') {
313: $r->print('
314: <form name="returnwin" action="/adm/flip?postdata=navlaunch%3a"
315: method="post" target="loncapaclient">
316: </form>');
317: $r->print('
318: <script type="text/javascript">
319: this.document.returnwin.submit();
320: </script>');
321: }
322:
323: if ($env{'environment.remotenavmap'} ne 'on') {
324: $r->print(&launch_win('link','yes',\%toplinkitems));
325: }
326: if ($env{'environment.remotenavmap'} eq 'on') {
327: &add_linkitem(\%toplinkitems,'closenav','collapse()',
328: "Close navigation window");
329: }
330:
331: my $jumpToFirstHomework = 0;
332: # Check to see if the student is jumping to next open, do-able problem
333: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
334: $jumpToFirstHomework = 1;
335: # Find the next homework problem that they can do.
336: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
337: my $curRes;
338: my $foundDoableProblem = 0;
339: my $problemRes;
340:
341: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
342: if (ref($curRes) && $curRes->is_problem()) {
343: my $status = $curRes->status();
344: if ($curRes->completable()) {
345: $problemRes = $curRes;
346: $foundDoableProblem = 1;
347:
348: # Pop open all previous maps
349: my $stack = $iterator->getStack();
350: pop @$stack; # last resource in the stack is the problem
351: # itself, which we don't need in the map stack
352: my @mapPcs = map {$_->map_pc()} @$stack;
353: $env{'form.filter'} = join(',', @mapPcs);
354:
355: # Mark as both "here" and "jump"
356: $env{'form.postsymb'} = $curRes->symb();
357: }
358: }
359: }
360:
361: # If we found no problems, print a note to that effect.
362: if (!$foundDoableProblem) {
363: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
364: }
365: } else {
366: &add_linkitem(\%toplinkitems,'firsthomework',
367: 'location.href="navmaps?jumpToFirstHomework"',
368: "Show Me My First Homework Problem");
369: }
370:
371: my $suppressEmptySequences = 0;
372: my $filterFunc = undef;
373: my $resource_no_folder_link = 0;
374:
375: # Display only due homework.
376: my $showOnlyHomework = 0;
377: if ($env{'form.showOnlyHomework'} eq "1") {
378: $showOnlyHomework = 1;
379: $suppressEmptySequences = 1;
380: $filterFunc = sub { my $res = shift;
381: return $res->completable() || $res->is_map();
382: };
383: &add_linkitem(\%toplinkitems,'everything',
384: 'location.href="navmaps?sort='.$env{'form.sort'}.'"',
385: "Show Everything");
386: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
387: $env{'form.filter'} = '';
388: $env{'form.condition'} = 1;
389: $resource_no_folder_link = 1;
390: } else {
391: &add_linkitem(\%toplinkitems,'uncompleted',
392: 'location.href="navmaps?sort='.$env{'form.sort'}.
393: '&showOnlyHomework=1"',
394: "Show Only Uncompleted Homework");
395: }
396:
397: my %selected=($env{'form.sort'} => 'selected=on');
398: my $sort_html=("<form>
399: <nobr>
400: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$env{'form.showOnlyHomework'}."\" />
401: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
402: <select name=\"sort\">
403: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
404: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
405: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
406: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has New Discussion')."</option>
407: </select>
408: </nobr>
409: </form>");
410: # renderer call
411: my $renderArgs = { 'cols' => [0,1,2,3],
412: 'sort' => $env{'form.sort'},
413: 'url' => '/adm/navmaps',
414: 'navmap' => $navmap,
415: 'suppressNavmap' => 1,
416: 'suppressEmptySequences' => $suppressEmptySequences,
417: 'filterFunc' => $filterFunc,
418: 'resource_no_folder_link' => $resource_no_folder_link,
419: 'sort_html'=> $sort_html,
420: 'r' => $r,
421: 'caller' => 'navmapsdisplay',
422: 'linkitems' => \%toplinkitems};
423: my $render = render($renderArgs);
424:
425: # If no resources were printed, print a reassuring message so the
426: # user knows there was no error.
427: if ($renderArgs->{'counter'} == 0) {
428: if ($showOnlyHomework) {
429: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
430: } else { # both jumpToFirstHomework and normal use the same: course must be empty
431: $r->print("<p><font size='+1'>This course is empty.</font></p>");
432: }
433: }
434: #my $td=&tv_interval($t0);
435: #$r->print("<br />$td");
436:
437: $r->print("</body></html>");
438: $r->rflush();
439:
440: return OK;
441: }
442:
443: # Convenience functions: Returns a string that adds or subtracts
444: # the second argument from the first hash, appropriate for the
445: # query string that determines which folders to recurse on
446: sub addToFilter {
447: my $hashIn = shift;
448: my $addition = shift;
449: my %hash = %$hashIn;
450: $hash{$addition} = 1;
451:
452: return join (",", keys(%hash));
453: }
454:
455: sub removeFromFilter {
456: my $hashIn = shift;
457: my $subtraction = shift;
458: my %hash = %$hashIn;
459:
460: delete $hash{$subtraction};
461: return join(",", keys(%hash));
462: }
463:
464: # Convenience function: Given a stack returned from getStack on the iterator,
465: # return the correct src() value.
466: sub getLinkForResource {
467: my $stack = shift;
468: my $res;
469:
470: # Check to see if there are any pages in the stack
471: foreach $res (@$stack) {
472: if (defined($res)) {
473: my $anchor;
474: if ($res->is_page()) {
475: foreach (@$stack) { if (defined($_)) { $anchor = $_; } }
476: $anchor=&Apache::lonnet::escape($anchor->shown_symb());
477: return ($res->link(),$res->shown_symb(),$anchor);
478: }
479: # in case folder was skipped over as "only sequence"
480: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
481: if ($map=~/\.page$/) {
482: my $url=&Apache::lonnet::clutter($map);
483: $anchor=&Apache::lonnet::escape($src->shown_symb());
484: return ($url,$res->shown_symb(),$anchor);
485: }
486: }
487: }
488:
489: # Failing that, return the src of the last resource that is defined
490: # (when we first recurse on a map, it puts an undefined resource
491: # on the bottom because $self->{HERE} isn't defined yet, and we
492: # want the src for the map anyhow)
493: foreach (@$stack) {
494: if (defined($_)) { $res = $_; }
495: }
496:
497: return ($res->link(),$res->shown_symb());
498: }
499:
500: # Convenience function: This separates the logic of how to create
501: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
502: # etc.) into a separate function. It takes a resource object as the
503: # first parameter, and the part number of the resource as the second.
504: # It's basically a big switch statement on the status of the resource.
505:
506: sub getDescription {
507: my $res = shift;
508: my $part = shift;
509: my $status = $res->status($part);
510:
511: if ($status == $res->NETWORK_FAILURE) {
512: return &mt("Having technical difficulties; please check status later");
513: }
514: if ($status == $res->NOTHING_SET) {
515: return &mt("Not currently assigned.");
516: }
517: if ($status == $res->OPEN_LATER) {
518: return "Open " . timeToHumanString($res->opendate($part),'start');
519: }
520: if ($status == $res->OPEN) {
521: if ($res->duedate($part)) {
522: return &mt("Due")." " .timeToHumanString($res->duedate($part),'end');
523: } else {
524: return &mt("Open, no due date");
525: }
526: }
527: if ($status == $res->PAST_DUE_ANSWER_LATER) {
528: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part),'start');
529: }
530: if ($status == $res->PAST_DUE_NO_ANSWER) {
531: return &mt("Was due")." " . timeToHumanString($res->duedate($part),'end');
532: }
533: if ($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT) {
534: return &mt("Answer available");
535: }
536: if ($status == $res->EXCUSED) {
537: return &mt("Excused by instructor");
538: }
539: if ($status == $res->ATTEMPTED) {
540: return &mt("Answer submitted, not yet graded");
541: }
542: if ($status == $res->TRIES_LEFT) {
543: my $tries = $res->tries($part);
544: my $maxtries = $res->maxtries($part);
545: my $triesString = "";
546: if ($tries && $maxtries) {
547: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
548: if ($maxtries > 1 && $maxtries - $tries == 1) {
549: $triesString = "<b>$triesString</b>";
550: }
551: }
552: if ($res->duedate($part)) {
553: return &mt("Due")." " . timeToHumanString($res->duedate($part),'end') .
554: " $triesString";
555: } else {
556: return &mt("No due date")." $triesString";
557: }
558: }
559: if ($status == $res->ANSWER_SUBMITTED) {
560: return &mt('Answer submitted');
561: }
562: }
563:
564: # Convenience function, so others can use it: Is the problem due in less then
565: # 24 hours, and still can be done?
566:
567: sub dueInLessThan24Hours {
568: my $res = shift;
569: my $part = shift;
570: my $status = $res->status($part);
571:
572: return ($status == $res->OPEN() ||
573: $status == $res->TRIES_LEFT()) &&
574: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
575: $res->duedate($part) > time();
576: }
577:
578: # Convenience function, so others can use it: Is there only one try remaining for the
579: # part, with more then one try to begin with, not due yet and still can be done?
580: sub lastTry {
581: my $res = shift;
582: my $part = shift;
583:
584: my $tries = $res->tries($part);
585: my $maxtries = $res->maxtries($part);
586: return $tries && $maxtries && $maxtries > 1 &&
587: $maxtries - $tries == 1 && $res->duedate($part) &&
588: $res->duedate($part) > time();
589: }
590:
591: # This puts a human-readable name on the env variable.
592:
593: sub advancedUser {
594: return $env{'request.role.adv'};
595: }
596:
597:
598: # timeToHumanString takes a time number and converts it to a
599: # human-readable representation, meant to be used in the following
600: # manner:
601: # print "Due $timestring"
602: # print "Open $timestring"
603: # print "Answer available $timestring"
604: # Very, very, very, VERY English-only... goodness help a localizer on
605: # this func...
606:
607:
608: sub timeToHumanString {
609: my ($time,$type,$format) = @_;
610:
611: # zero, '0' and blank are bad times
612: if (!$time) {
613: return &mt('never');
614: }
615: unless (&Apache::lonlocal::current_language()=~/^en/) {
616: return &Apache::lonlocal::locallocaltime($time);
617: }
618: my $now = time();
619:
620: my @time = localtime($time);
621: my @now = localtime($now);
622:
623: # Positive = future
624: my $delta = $time - $now;
625:
626: my $minute = 60;
627: my $hour = 60 * $minute;
628: my $day = 24 * $hour;
629: my $week = 7 * $day;
630: my $inPast = 0;
631:
632: # Logic in comments:
633: # Is it now? (extremely unlikely)
634: if ( $delta == 0 ) {
635: return "this instant";
636: }
637:
638: if ($delta < 0) {
639: $inPast = 1;
640: $delta = -$delta;
641: }
642:
643: if ( $delta > 0 ) {
644:
645: my $tense = $inPast ? " ago" : "";
646: my $prefix = $inPast ? "" : "in ";
647:
648: # Less then a minute
649: if ( $delta < $minute ) {
650: if ($delta == 1) { return "${prefix}1 second$tense"; }
651: return "$prefix$delta seconds$tense";
652: }
653:
654: # Less then an hour
655: if ( $delta < $hour ) {
656: # If so, use minutes
657: my $minutes = floor($delta / 60);
658: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
659: return "$prefix$minutes minutes$tense";
660: }
661:
662: # Is it less then 24 hours away? If so,
663: # display hours + minutes
664: if ( $delta < $hour * 24) {
665: my $hours = floor($delta / $hour);
666: my $minutes = floor(($delta % $hour) / $minute);
667: my $hourString = "$hours hours";
668: my $minuteString = ", $minutes minutes";
669: if ($hours == 1) {
670: $hourString = "1 hour";
671: }
672: if ($minutes == 1) {
673: $minuteString = ", 1 minute";
674: }
675: if ($minutes == 0) {
676: $minuteString = "";
677: }
678: return "$prefix$hourString$minuteString$tense";
679: }
680:
681: # If there's a caller supplied format, use it.
682:
683: if($format ne '') {
684: my $timeStr = strftime($format, localtime($time));
685: return $timeStr.&Apache::lonlocal::gettimezone();
686: }
687:
688: # Less then 5 days away, display day of the week and
689: # HH:MM
690:
691: if ( $delta < $day * 5 ) {
692: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
693: $timeStr =~ s/12:00 am/00:00/;
694: $timeStr =~ s/12:00 pm/noon/;
695: return ($inPast ? "last " : "this ") .
696: $timeStr.&Apache::lonlocal::gettimezone();
697: }
698:
699: my $conjunction='on';
700: if ($type eq 'start') {
701: $conjunction='at';
702: } elsif ($type eq 'end') {
703: $conjunction='by';
704: }
705: # Is it this year?
706: if ( $time[5] == $now[5]) {
707: # Return on Month Day, HH:MM meridian
708: my $timeStr = strftime("$conjunction %A, %b %e at %I:%M %P", localtime($time));
709: $timeStr =~ s/12:00 am/00:00/;
710: $timeStr =~ s/12:00 pm/noon/;
711: return $timeStr.&Apache::lonlocal::gettimezone();
712: }
713:
714: # Not this year, so show the year
715: my $timeStr = strftime("$conjunction %A, %b %e %Y at %I:%M %P", localtime($time));
716: $timeStr =~ s/12:00 am/00:00/;
717: $timeStr =~ s/12:00 pm/noon/;
718: return $timeStr.&Apache::lonlocal::gettimezone();
719: }
720: }
721:
722:
723: =pod
724:
725: =head1 NAME
726:
727: Apache::lonnavmap - Subroutines to handle and render the navigation
728: maps
729:
730: =head1 SYNOPSIS
731:
732: The main handler generates the navigational listing for the course,
733: the other objects export this information in a usable fashion for
734: other modules.
735:
736: =head1 OVERVIEW
737:
738: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
739: course structure and caches it in what is often referred to as the
740: "big hash" X<big hash>. You can see it if you are logged into
741: LON-CAPA, in a course, by going to /adm/test. (You may need to
742: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
743: content of the hash will be under the heading "Big Hash".
744:
745: Big Hash contains, among other things, how resources are related
746: to each other (next/previous), what resources are maps, which
747: resources are being chosen to not show to the student (for random
748: selection), and a lot of other things that can take a lot of time
749: to compute due to the amount of data that needs to be collected and
750: processed.
751:
752: Apache::lonnavmaps provides an object model for manipulating this
753: information in a higher-level fashion then directly manipulating
754: the hash. It also provides access to several auxilary functions
755: that aren't necessarily stored in the Big Hash, but are a per-
756: resource sort of value, like whether there is any feedback on
757: a given resource.
758:
759: Apache::lonnavmaps also abstracts away branching, and someday,
760: conditions, for the times where you don't really care about those
761: things.
762:
763: Apache::lonnavmaps also provides fairly powerful routines for
764: rendering navmaps, and last but not least, provides the navmaps
765: view for when the user clicks the NAV button.
766:
767: B<Note>: Apache::lonnavmaps I<only> works for the "currently
768: logged in user"; if you want things like "due dates for another
769: student" lonnavmaps can not directly retrieve information like
770: that. You need the EXT function. This module can still help,
771: because many things, such as the course structure, are constant
772: between users, and Apache::lonnavmaps can help by providing
773: symbs for the EXT call.
774:
775: The rest of this file will cover the provided rendering routines,
776: which can often be used without fiddling with the navmap object at
777: all, then documents the Apache::lonnavmaps::navmap object, which
778: is the key to accessing the Big Hash information, covers the use
779: of the Iterator (which provides the logic for traversing the
780: somewhat-complicated Big Hash data structure), documents the
781: Apache::lonnavmaps::Resource objects that are returned by
782:
783: =head1 Subroutine: render
784:
785: The navmap renderer package provides a sophisticated rendering of the
786: standard navigation maps interface into HTML. The provided nav map
787: handler is actually just a glorified call to this.
788:
789: Because of the large number of parameters this function accepts,
790: instead of passing it arguments as is normal, pass it in an anonymous
791: hash with the desired options.
792:
793: The package provides a function called 'render', called as
794: Apache::lonnavmaps::render({}).
795:
796: =head2 Overview of Columns
797:
798: The renderer will build an HTML table for the navmap and return
799: it. The table is consists of several columns, and a row for each
800: resource (or possibly each part). You tell the renderer how many
801: columns to create and what to place in each column, optionally using
802: one or more of the prepared columns, and the renderer will assemble
803: the table.
804:
805: Any additional generally useful column types should be placed in the
806: renderer code here, so anybody can use it anywhere else. Any code
807: specific to the current application (such as the addition of <input>
808: elements in a column) should be placed in the code of the thing using
809: the renderer.
810:
811: At the core of the renderer is the array reference COLS (see Example
812: section below for how to pass this correctly). The COLS array will
813: consist of entries of one of two types of things: Either an integer
814: representing one of the pre-packaged column types, or a sub reference
815: that takes a resource reference, a part number, and a reference to the
816: argument hash passed to the renderer, and returns a string that will
817: be inserted into the HTML representation as it.
818:
819: All other parameters are ways of either changing how the columns
820: are printing, or which rows are shown.
821:
822: The pre-packaged column names are refered to by constants in the
823: Apache::lonnavmaps namespace. The following currently exist:
824:
825: =over 4
826:
827: =item * B<Apache::lonnavmaps::resource>:
828:
829: The general info about the resource: Link, icon for the type, etc. The
830: first column in the standard nav map display. This column provides the
831: indentation effect seen in the B<NAV> screen. This column also accepts
832: the following parameters in the renderer hash:
833:
834: =over 4
835:
836: =item * B<resource_nolink>: default false
837:
838: If true, the resource will not be linked. By default, all non-folder
839: resources are linked.
840:
841: =item * B<resource_part_count>: default true
842:
843: If true, the resource will show a part count B<if> the full
844: part list is not displayed. (See "condense_parts" later.) If false,
845: the resource will never show a part count.
846:
847: =item * B<resource_no_folder_link>:
848:
849: If true, the resource's folder will not be clickable to open or close
850: it. Default is false. True implies printCloseAll is false, since you
851: can't close or open folders when this is on anyhow.
852:
853: =back
854:
855: =item * B<Apache::lonnavmaps::communication_status>:
856:
857: Whether there is discussion on the resource, email for the user, or
858: (lumped in here) perl errors in the execution of the problem. This is
859: the second column in the main nav map.
860:
861: =item * B<Apache::lonnavmaps::quick_status>:
862:
863: An icon for the status of a problem, with five possible states:
864: Correct, incorrect, open, awaiting grading (for a problem where the
865: computer's grade is suppressed, or the computer can't grade, like
866: essay problem), or none (not open yet, not a problem). The
867: third column of the standard navmap.
868:
869: =item * B<Apache::lonnavmaps::long_status>:
870:
871: A text readout of the details of the current status of the problem,
872: such as "Due in 22 hours". The fourth column of the standard navmap.
873:
874: =item * B<Apache::lonnavmaps::part_status_summary>:
875:
876: A text readout summarizing the status of the problem. If it is a
877: single part problem, will display "Correct", "Incorrect",
878: "Not yet open", "Open", "Attempted", or "Error". If there are
879: multiple parts, this will output a string that in HTML will show a
880: status of how many parts are in each status, in color coding, trying
881: to match the colors of the icons within reason.
882:
883: Note this only makes sense if you are I<not> showing parts. If
884: C<showParts> is true (see below), this column will not output
885: anything.
886:
887: =back
888:
889: If you add any others please be sure to document them here.
890:
891: An example of a column renderer that will show the ID number of a
892: resource, along with the part name if any:
893:
894: sub {
895: my ($resource, $part, $params) = @_;
896: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
897: return '<td>' . $resource->{ID} . '</td>';
898: }
899:
900: Note these functions are responsible for the TD tags, which allow them
901: to override vertical and horizontal alignment, etc.
902:
903: =head2 Parameters
904:
905: Minimally, you should be
906: able to get away with just using 'cols' (to specify the columns
907: shown), 'url' (necessary for the folders to link to the current screen
908: correctly), and possibly 'queryString' if your app calls for it. In
909: that case, maintaining the state of the folders will be done
910: automatically.
911:
912: =over 4
913:
914: =item * B<iterator>: default: constructs one from %env
915:
916: A reference to a fresh ::iterator to use from the navmaps. The
917: rendering will reflect the options passed to the iterator, so you can
918: use that to just render a certain part of the course, if you like. If
919: one is not passed, the renderer will attempt to construct one from
920: env{'form.filter'} and env{'form.condition'} information, plus the
921: 'iterator_map' parameter if any.
922:
923: =item * B<iterator_map>: default: not used
924:
925: If you are letting the renderer do the iterator handling, you can
926: instruct the renderer to render only a particular map by passing it
927: the source of the map you want to process, like
928: '/res/103/jerf/navmap.course.sequence'.
929:
930: =item * B<navmap>: default: constructs one from %env
931:
932: A reference to a navmap, used only if an iterator is not passed in. If
933: this is necessary to make an iterator but it is not passed in, a new
934: one will be constructed based on env info. This is useful to do basic
935: error checking before passing it off to render.
936:
937: =item * B<r>: default: must be passed in
938:
939: The standard Apache response object. This must be passed to the
940: renderer or the course hash will be locked.
941:
942: =item * B<cols>: default: empty (useless)
943:
944: An array reference
945:
946: =item * B<showParts>:default true
947:
948: A flag. If true, a line for the resource itself, and a line
949: for each part will be displayed. If not, only one line for each
950: resource will be displayed.
951:
952: =item * B<condenseParts>: default true
953:
954: A flag. If true, if all parts of the problem have the same
955: status and that status is Nothing Set, Correct, or Network Failure,
956: then only one line will be displayed for that resource anyhow. If no,
957: all parts will always be displayed. If showParts is 0, this is
958: ignored.
959:
960: =item * B<jumpCount>: default: determined from %env
961:
962: A string identifying the URL to place the anchor 'curloc' at.
963: It is the responsibility of the renderer user to
964: ensure that the #curloc is in the URL. By default, determined through
965: the use of the env{} 'jump' information, and should normally "just
966: work" correctly.
967:
968: =item * B<here>: default: empty string
969:
970: A Symb identifying where to place the 'here' marker. The empty
971: string means no marker.
972:
973: =item * B<indentString>: default: 25 pixel whitespace image
974:
975: A string identifying the indentation string to use.
976:
977: =item * B<queryString>: default: empty
978:
979: A string which will be prepended to the query string used when the
980: folders are opened or closed. You can use this to pass
981: application-specific values.
982:
983: =item * B<url>: default: none
984:
985: The url the folders will link to, which should be the current
986: page. Required if the resource info column is shown, and you
987: are allowing the user to open and close folders.
988:
989: =item * B<currentJumpIndex>: default: no jumping
990:
991: Describes the currently-open row number to cause the browser to jump
992: to, because the user just opened that folder. By default, pulled from
993: the Jump information in the env{'form.*'}.
994:
995: =item * B<printKey>: default: false
996:
997: If true, print the key that appears on the top of the standard
998: navmaps.
999:
1000: =item * B<printCloseAll>: default: true
1001:
1002: If true, print the "Close all folders" or "open all folders"
1003: links.
1004:
1005: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1006:
1007: A function that takes the resource object as its only parameter and
1008: returns a true or false value. If true, the resource is displayed. If
1009: false, it is simply skipped in the display.
1010:
1011: =item * B<suppressEmptySequences>: default: false
1012:
1013: If you're using a filter function, and displaying sequences to orient
1014: the user, then frequently some sequences will be empty. Setting this to
1015: true will cause those sequences not to display, so as not to confuse the
1016: user into thinking that if the sequence is there there should be things
1017: under it; for example, see the "Show Uncompleted Homework" view on the
1018: B<NAV> screen.
1019:
1020: =item * B<suppressNavmaps>: default: false
1021:
1022: If true, will not display Navigate Content resources.
1023:
1024: =back
1025:
1026: =head2 Additional Info
1027:
1028: In addition to the parameters you can pass to the renderer, which will
1029: be passed through unchange to the column renderers, the renderer will
1030: generate the following information which your renderer may find
1031: useful:
1032:
1033: =over 4
1034:
1035: =item * B<counter>:
1036:
1037: Contains the number of rows printed. Useful after calling the render
1038: function, as you can detect whether anything was printed at all.
1039:
1040: =item * B<isNewBranch>:
1041:
1042: Useful for renderers: If this resource is currently the first resource
1043: of a new branch, this will be true. The Resource column (leftmost in the
1044: navmaps screen) uses this to display the "new branch" icon
1045:
1046: =back
1047:
1048: =cut
1049:
1050: sub resource { return 0; }
1051: sub communication_status { return 1; }
1052: sub quick_status { return 2; }
1053: sub long_status { return 3; }
1054: sub part_status_summary { return 4; }
1055:
1056: sub render_resource {
1057: my ($resource, $part, $params) = @_;
1058:
1059: my $nonLinkedText = ''; # stuff after resource title not in link
1060:
1061: my $link = $params->{"resourceLink"};
1062:
1063: # The URL part is not escaped at this point, but the symb is...
1064: # The stuff to the left of the ? must have ' replaced by \' since
1065: # it will be quoted with ' in the href.
1066:
1067: my ($left,$right) = split(/\?/, $link);
1068: $link = $left.'?'.$right;
1069:
1070: my $src = $resource->src();
1071: my $it = $params->{"iterator"};
1072: my $filter = $it->{FILTER};
1073:
1074: my $title = $resource->compTitle();
1075:
1076: my $partLabel = "";
1077: my $newBranchText = "";
1078: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1079: # If this is a new branch, label it so
1080: if ($params->{'isNewBranch'}) {
1081: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
1082: }
1083:
1084: # links to open and close the folder
1085:
1086:
1087: my $linkopen = "<a href=\"$link\">";
1088:
1089:
1090: my $linkclose = "</a>";
1091:
1092: # Default icon: unknown page
1093: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
1094:
1095: if ($resource->is_problem()) {
1096: if ($part eq '0' || $params->{'condensed'}) {
1097: $icon ='<img src="'.$location.'/problem.gif" alt=" " border="0" />';
1098: } else {
1099: $icon = $params->{'indentString'};
1100: }
1101: } else {
1102: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
1103: }
1104:
1105: # Display the correct map icon to open or shut map
1106: if ($resource->is_map()) {
1107: my $mapId = $resource->map_pc();
1108: my $nowOpen = !defined($filter->{$mapId});
1109: if ($it->{CONDITION}) {
1110: $nowOpen = !$nowOpen;
1111: }
1112:
1113: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1114:
1115: if (!$params->{'resource_no_folder_link'}) {
1116: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1117: $icon = "<img src='$location/$icon' alt='".
1118: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1119:
1120: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
1121: $params->{'queryString'} . '&filter=';
1122: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1123: addToFilter($filter, $mapId) :
1124: removeFromFilter($filter, $mapId);
1125: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1126: . $params->{'hereType'} . '&here=' .
1127: &Apache::lonnet::escape($params->{'here'}) .
1128: '&jump=' .
1129: &Apache::lonnet::escape($resource->symb()) .
1130: "&folderManip=1\">";
1131:
1132: } else {
1133: # Don't allow users to manipulate folder
1134: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1135: '.nomanip.gif';
1136: $icon = "<img src='$location/$icon' alt='".
1137: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1138:
1139: $linkopen = "";
1140: $linkclose = "";
1141: }
1142: }
1143:
1144: if ($resource->randomout()) {
1145: $nonLinkedText .= ' <i>(hidden)</i> ';
1146: }
1147: if (!$resource->condval()) {
1148: $nonLinkedText .= ' <i>(conditionally hidden)</i> ';
1149: }
1150:
1151: # We're done preparing and finally ready to start the rendering
1152: my $result = "<td align='left' valign='center'>";
1153:
1154: my $indentLevel = $params->{'indentLevel'};
1155: if ($newBranchText) { $indentLevel--; }
1156:
1157: # print indentation
1158: for (my $i = 0; $i < $indentLevel; $i++) {
1159: $result .= $params->{'indentString'};
1160: }
1161:
1162: # Decide what to display
1163:
1164: $result .= "$newBranchText$linkopen$icon$linkclose";
1165:
1166: my $curMarkerBegin = '';
1167: my $curMarkerEnd = '';
1168:
1169: # Is this the current resource?
1170: if (!$params->{'displayedHereMarker'} &&
1171: $resource->symb() eq $params->{'here'} ) {
1172: $curMarkerBegin = '<font color="red" size="+2">></font>';
1173: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1174: $params->{'displayedHereMarker'} = 1;
1175: }
1176:
1177: if ($resource->is_problem() && $part ne '0' &&
1178: !$params->{'condensed'}) {
1179: my $displaypart=$resource->part_display($part);
1180: $partLabel = " (Part: $displaypart)";
1181: if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1182: $title = "";
1183: }
1184:
1185: if ($params->{'condensed'} && $resource->countParts() > 1) {
1186: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1187: }
1188:
1189: my $target;
1190: if ($env{'environment.remotenavmap'} eq 'on') {
1191: $target=' target="loncapaclient" ';
1192: }
1193: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1194: $result .= " $curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1195: } else {
1196: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1197: }
1198:
1199: return $result;
1200: }
1201:
1202: sub render_communication_status {
1203: my ($resource, $part, $params) = @_;
1204: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1205:
1206: my $link = $params->{"resourceLink"};
1207: my $target;
1208: if ($env{'environment.remotenavmap'} eq 'on') {
1209: $target=' target="loncapaclient" ';
1210: }
1211: my $linkopen = "<a $target href=\"$link\">";
1212: my $linkclose = "</a>";
1213: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1214: if ($resource->hasDiscussion()) {
1215: $discussionHTML = $linkopen .
1216: '<img border="0" src="'.$location.'/chat.gif" />' .
1217: $linkclose;
1218: }
1219:
1220: if ($resource->getFeedback()) {
1221: my $feedback = $resource->getFeedback();
1222: foreach (split(/\,/, $feedback)) {
1223: if ($_) {
1224: $feedbackHTML .= ' <a '.$target.' href="/adm/email?display='
1225: . &Apache::lonnet::escape($_) . '">'
1226: . '<img src="'.$location.'/feedback.gif" '
1227: . 'border="0" /></a>';
1228: }
1229: }
1230: }
1231:
1232: if ($resource->getErrors()) {
1233: my $errors = $resource->getErrors();
1234: my $errorcount = 0;
1235: foreach (split(/,/, $errors)) {
1236: last if ($errorcount>=10); # Only output 10 bombs maximum
1237: if ($_) {
1238: $errorcount++;
1239: $errorHTML .= ' <a '.$target.' href="/adm/email?display='
1240: . &Apache::lonnet::escape($_) . '">'
1241: . '<img src="'.$location.'/bomb.gif" '
1242: . 'border="0" /></a>';
1243: }
1244: }
1245: }
1246:
1247: if ($params->{'multipart'} && $part != '0') {
1248: $discussionHTML = $feedbackHTML = $errorHTML = '';
1249: }
1250:
1251: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1252:
1253: }
1254: sub render_quick_status {
1255: my ($resource, $part, $params) = @_;
1256: my $result = "";
1257: my $firstDisplayed = !$params->{'condensed'} &&
1258: $params->{'multipart'} && $part eq "0";
1259:
1260: my $link = $params->{"resourceLink"};
1261: my $target;
1262: if ($env{'environment.remotenavmap'} eq 'on') {
1263: $target=' target="loncapaclient" ';
1264: }
1265: my $linkopen = "<a $target href=\"$link\">";
1266: my $linkclose = "</a>";
1267:
1268: if ($resource->is_problem() &&
1269: !$firstDisplayed) {
1270:
1271: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1272: my $alt = $iconAltTags{$icon};
1273: if ($icon) {
1274: my $location=
1275: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1276: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1277: } else {
1278: $result .= "<td width='30'> </td>\n";
1279: }
1280: } else { # not problem, no icon
1281: $result .= "<td width='30'> </td>\n";
1282: }
1283:
1284: return $result;
1285: }
1286: sub render_long_status {
1287: my ($resource, $part, $params) = @_;
1288: my $result = "<td align='right' valign='center'>\n";
1289: my $firstDisplayed = !$params->{'condensed'} &&
1290: $params->{'multipart'} && $part eq "0";
1291:
1292: my $color;
1293: if ($resource->is_problem()) {
1294: $color = $colormap{$resource->status};
1295:
1296: if (dueInLessThan24Hours($resource, $part) ||
1297: lastTry($resource, $part)) {
1298: $color = $hurryUpColor;
1299: }
1300: }
1301:
1302: if ($resource->kind() eq "res" &&
1303: $resource->is_problem() &&
1304: !$firstDisplayed) {
1305: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1306: $result .= getDescription($resource, $part);
1307: if ($color) {$result .= "</b></font>"; }
1308: }
1309: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1310: $result .= '(randomly select ' . $resource->randompick() .')';
1311: }
1312:
1313: # Debugging code
1314: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1315: # ' - Part: ' . $part;
1316:
1317: $result .= "</td>\n";
1318:
1319: return $result;
1320: }
1321:
1322: # Colors obtained by taking the icons, matching the colors, and
1323: # possibly reducing the Value (HSV) of the color, if it's too bright
1324: # for text, generally by one third or so.
1325: my %statusColors =
1326: (
1327: $resObj->CLOSED => '#000000',
1328: $resObj->OPEN => '#998b13',
1329: $resObj->CORRECT => '#26933f',
1330: $resObj->INCORRECT => '#c48207',
1331: $resObj->ATTEMPTED => '#a87510',
1332: $resObj->ERROR => '#000000'
1333: );
1334: my %statusStrings =
1335: (
1336: $resObj->CLOSED => 'Not yet open',
1337: $resObj->OPEN => 'Open',
1338: $resObj->CORRECT => 'Correct',
1339: $resObj->INCORRECT => 'Incorrect',
1340: $resObj->ATTEMPTED => 'Attempted',
1341: $resObj->ERROR => 'Network Error'
1342: );
1343: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1344:
1345: use Data::Dumper;
1346: sub render_parts_summary_status {
1347: my ($resource, $part, $params) = @_;
1348: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1349: if ($params->{showParts}) {
1350: return '<td></td>';
1351: }
1352:
1353: my $td = "<td align='right'>\n";
1354: my $endtd = "</td>\n";
1355: my @probs;
1356:
1357: if ($resource->contains_problem) {
1358: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1359: } else {
1360: @probs=($resource);
1361: }
1362: my $return;
1363: my %overallstatus;
1364: my $totalParts;
1365: foreach my $resource (@probs) {
1366: # If there is a single part, just show the simple status
1367: if ($resource->singlepart()) {
1368: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1369: $overallstatus{$status}++;
1370: $totalParts++;
1371: next;
1372: }
1373: # Now we can be sure the $part doesn't really matter.
1374: my $statusCount = $resource->simpleStatusCount();
1375: my @counts;
1376: foreach my $status (@statuses) {
1377: # decouple display order from the simpleStatusCount order
1378: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1379: if ($statusCount->[$slot]) {
1380: $overallstatus{$status}+=$statusCount->[$slot];
1381: $totalParts+=$statusCount->[$slot];
1382: }
1383: }
1384: }
1385: $return.= $td . $totalParts . ' parts: ';
1386: foreach my $status (@statuses) {
1387: if ($overallstatus{$status}) {
1388: $return.="<font color='" . $statusColors{$status} .
1389: "'>" . $overallstatus{$status} . ' '
1390: . $statusStrings{$status} . "</font>";
1391: }
1392: }
1393: $return.= $endtd;
1394: return $return;
1395: }
1396:
1397: my @preparedColumns = (\&render_resource, \&render_communication_status,
1398: \&render_quick_status, \&render_long_status,
1399: \&render_parts_summary_status);
1400:
1401: sub setDefault {
1402: my ($val, $default) = @_;
1403: if (!defined($val)) { return $default; }
1404: return $val;
1405: }
1406:
1407: sub cmp_title {
1408: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1409: $atitle=~s/^\s*//;
1410: $btitle=~s/^\s*//;
1411: return $atitle cmp $btitle;
1412: }
1413:
1414: sub render {
1415: my $args = shift;
1416: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1417: my $result = '';
1418: # Configure the renderer.
1419: my $cols = $args->{'cols'};
1420: if (!defined($cols)) {
1421: # no columns, no nav maps.
1422: return '';
1423: }
1424: my $navmap;
1425: if (defined($args->{'navmap'})) {
1426: $navmap = $args->{'navmap'};
1427: }
1428:
1429: my $r = $args->{'r'};
1430: my $queryString = $args->{'queryString'};
1431: my $jump = $args->{'jump'};
1432: my $here = $args->{'here'};
1433: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1434: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1435: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1436: # before the current resource when using #current
1437:
1438: # If we were passed 'here' information, we are not rendering
1439: # after a folder manipulation, and we were not passed an
1440: # iterator, make sure we open the folders to show the "here"
1441: # marker
1442: my $filterHash = {};
1443: # Figure out what we're not displaying
1444: foreach (split(/\,/, $env{"form.filter"})) {
1445: if ($_) {
1446: $filterHash->{$_} = "1";
1447: }
1448: }
1449:
1450: # Filter: Remember filter function and add our own filter: Refuse
1451: # to show hidden resources unless the user can see them.
1452: my $userCanSeeHidden = advancedUser();
1453: my $filterFunc = setDefault($args->{'filterFunc'},
1454: sub {return 1;});
1455: if (!$userCanSeeHidden) {
1456: # Without renaming the filterfunc, the server seems to go into
1457: # an infinite loop
1458: my $oldFilterFunc = $filterFunc;
1459: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1460: &$oldFilterFunc($res);};
1461: }
1462:
1463: my $condition = 0;
1464: if ($env{'form.condition'}) {
1465: $condition = 1;
1466: }
1467:
1468: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1469: # Step 1: Check to see if we have a navmap
1470: if (!defined($navmap)) {
1471: $navmap = Apache::lonnavmaps::navmap->new();
1472: if (!defined($navmap)) {
1473: # no londer in course
1474: return '<font color="red">No course selected</font><br />
1475: <a href="/adm/roles">Select a course</a><br />';
1476: }
1477: }
1478:
1479: # Step two: Locate what kind of here marker is necessary
1480: # Determine where the "here" marker is and where the screen jumps to.
1481:
1482: if ($env{'form.postsymb'} ne '') {
1483: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1484: } elsif ($env{'form.postdata'} ne '') {
1485: # couldn't find a symb, is there a URL?
1486: my $currenturl = $env{'form.postdata'};
1487: #$currenturl=~s/^http\:\/\///;
1488: #$currenturl=~s/^[^\/]+//;
1489:
1490: $here = $jump = &Apache::lonnet::symbread($currenturl);
1491: }
1492: if ($here eq '') {
1493: my $last;
1494: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1495: &GDBM_READER(),0640)) {
1496: $last=$hash{'last_known'};
1497: untie(%hash);
1498: }
1499: if ($last) { $here = $jump = $last; }
1500: }
1501:
1502: # Step three: Ensure the folders are open
1503: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1504: my $curRes;
1505: my $found = 0;
1506:
1507: # We only need to do this if we need to open the maps to show the
1508: # current position. This will change the counter so we can't count
1509: # for the jump marker with this loop.
1510: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1511: if (ref($curRes) && $curRes->symb() eq $here) {
1512: my $mapStack = $mapIterator->getStack();
1513:
1514: # Ensure the parent maps are open
1515: for my $map (@{$mapStack}) {
1516: if ($condition) {
1517: undef $filterHash->{$map->map_pc()};
1518: } else {
1519: $filterHash->{$map->map_pc()} = 1;
1520: }
1521: }
1522: $found = 1;
1523: }
1524: }
1525: }
1526:
1527: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1528: # If this is a click on a folder or something, we want to preserve the "here"
1529: # from the querystring, and get the new "jump" marker
1530: $here = $env{'form.here'};
1531: $jump = $env{'form.jump'};
1532: }
1533:
1534: my $it = $args->{'iterator'};
1535: if (!defined($it)) {
1536: # Construct a default iterator based on $env{'form.'} information
1537:
1538: # Step 1: Check to see if we have a navmap
1539: if (!defined($navmap)) {
1540: $navmap = Apache::lonnavmaps::navmap->new();
1541: }
1542:
1543: # See if we're being passed a specific map
1544: if ($args->{'iterator_map'}) {
1545: my $map = $args->{'iterator_map'};
1546: $map = $navmap->getResourceByUrl($map);
1547: my $firstResource = $map->map_start();
1548: my $finishResource = $map->map_finish();
1549:
1550: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1551: } else {
1552: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1553: }
1554: }
1555:
1556: # (re-)Locate the jump point, if any
1557: # Note this does not take filtering or hidden into account... need
1558: # to be fixed?
1559: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1560: my $curRes;
1561: my $foundJump = 0;
1562: my $counter = 0;
1563:
1564: while (($curRes = $mapIterator->next()) && !$foundJump) {
1565: if (ref($curRes)) { $counter++; }
1566:
1567: if (ref($curRes) && $jump eq $curRes->symb()) {
1568:
1569: # This is why we have to use the main iterator instead of the
1570: # potentially faster DFS: The count has to be the same, so
1571: # the order has to be the same, which DFS won't give us.
1572: $args->{'currentJumpIndex'} = $counter;
1573: $foundJump = 1;
1574: }
1575: }
1576:
1577: my $showParts = setDefault($args->{'showParts'}, 1);
1578: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1579: # keeps track of when the current resource is found,
1580: # so we can back up a few and put the anchor above the
1581: # current resource
1582: my $printKey = $args->{'printKey'};
1583: my $printCloseAll = $args->{'printCloseAll'};
1584: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1585:
1586: # Print key?
1587: if ($printKey) {
1588: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1589: my $date=localtime;
1590: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1591: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1592: if ($navmap->{LAST_CHECK}) {
1593: $result .=
1594: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1595: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1596: '</td><td align="center" valign="bottom"> '.
1597: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1598: '</td>';
1599: } else {
1600: $result .= '<td align="center" valign="bottom"> '.
1601: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1602: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1603: '</td>';
1604: }
1605:
1606: $result .= '</tr></table>';
1607: }
1608:
1609: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1610: my ($link,$text);
1611: if ($condition) {
1612: $link='"navmaps?condition=0&filter=&'.$queryString.
1613: '&here='.&Apache::lonnet::escape($here).'"';
1614: $text='Close All Folders';
1615: } else {
1616: $link='"navmaps?condition=1&filter=&'.$queryString.
1617: '&here='.&Apache::lonnet::escape($here).'"';
1618: $text='Open All Folders';
1619: }
1620: if ($args->{'caller'} eq 'navmapsdisplay') {
1621: &add_linkitem($args->{'linkitems'},'changefolder',
1622: 'location.href='.$link,$text);
1623: } else {
1624: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1625: }
1626: $result .= "\n";
1627: }
1628:
1629: # Check for any unread discussions in all resources.
1630: if ($args->{'caller'} eq 'navmapsdisplay') {
1631: &add_linkitem($args->{'linkitems'},'clearbubbles',
1632: 'document.clearbubbles.submit()',
1633: 'Mark all posts read');
1634: my $time=time;
1635: $result .= (<<END);
1636: <form name="clearbubbles" method="post" action="/adm/feedback">
1637: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1638: <input type="hidden" name="navtime" value="$time" />
1639: END
1640: if ($args->{'sort'} eq 'discussion') {
1641: my $totdisc = 0;
1642: my $haveDisc = '';
1643: my @allres=$navmap->retrieveResources();
1644: foreach my $resource (@allres) {
1645: if ($resource->hasDiscussion()) {
1646: $haveDisc .= $resource->wrap_symb().':';
1647: $totdisc ++;
1648: }
1649: }
1650: if ($totdisc > 0) {
1651: $haveDisc =~ s/:$//;
1652: $result .= (<<END);
1653: <input type="hidden" name="navmaps" value="$haveDisc" />
1654: </form>
1655: END
1656: }
1657: }
1658: $result.='</form>';
1659: }
1660:
1661: if ($args->{'caller'} eq 'navmapsdisplay') {
1662: $result .= '<table><tr><td>'.
1663: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1664: if ($env{'environment.remotenavmap'} ne 'on') {
1665: $result .= '<td> </td>';
1666: } else {
1667: $result .= '</tr><tr>';
1668: }
1669: $result.=&show_linkitems($args->{'linkitems'});
1670: if ($args->{'sort_html'}) {
1671: if ($env{'environment.remotenavmap'} ne 'on') {
1672: $result.='<td> </td><td> </td><td> </td>'.
1673: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1674: } else {
1675: $result.='</tr><tr><td align="left"><br />'.
1676: $args->{'sort_html'}.'</td></tr>';
1677: }
1678: }
1679: $result .= '</table>';
1680: } elsif ($args->{'sort_html'}) {
1681: $result.=$args->{'sort_html'};
1682: }
1683:
1684: $result .= "<br />\n";
1685: if ($r) {
1686: $r->print($result);
1687: $r->rflush();
1688: $result = "";
1689: }
1690: # End parameter setting
1691:
1692: # Data
1693: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1694: my $res = "Apache::lonnavmaps::resource";
1695: my %condenseStatuses =
1696: ( $res->NETWORK_FAILURE => 1,
1697: $res->NOTHING_SET => 1,
1698: $res->CORRECT => 1 );
1699: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1700:
1701: # Shared variables
1702: $args->{'counter'} = 0; # counts the rows
1703: $args->{'indentLevel'} = 0;
1704: $args->{'isNewBranch'} = 0;
1705: $args->{'condensed'} = 0;
1706: my $location=
1707: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1708: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1709: $args->{'displayedHereMarker'} = 0;
1710:
1711: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1712: # since structure actually doesn't matter, except what map has what resources.
1713: if ($args->{'suppressEmptySequences'}) {
1714: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1715: $it->{FIRST_RESOURCE},
1716: $it->{FINISH_RESOURCE},
1717: {}, undef, 1);
1718: my $depth = 0;
1719: $dfsit->next();
1720: my $curRes = $dfsit->next();
1721: while ($depth > -1) {
1722: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1723: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1724:
1725: if (ref($curRes)) {
1726: # Parallel pre-processing: Do sequences have non-filtered-out children?
1727: if ($curRes->is_map()) {
1728: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1729: # Sequences themselves do not count as visible children,
1730: # unless those sequences also have visible children.
1731: # This means if a sequence appears, there's a "promise"
1732: # that there's something under it if you open it, somewhere.
1733: } else {
1734: # Not a sequence: if it's filtered, ignore it, otherwise
1735: # rise up the stack and mark the sequences as having children
1736: if (&$filterFunc($curRes)) {
1737: for my $sequence (@{$dfsit->getStack()}) {
1738: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1739: }
1740: }
1741: }
1742: }
1743: } continue {
1744: $curRes = $dfsit->next();
1745: }
1746: }
1747:
1748: my $displayedJumpMarker = 0;
1749: # Set up iteration.
1750: my $now = time();
1751: my $in24Hours = $now + 24 * 60 * 60;
1752: my $rownum = 0;
1753:
1754: # export "here" marker information
1755: $args->{'here'} = $here;
1756:
1757: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1758: my @resources;
1759: my $code='';# sub { !(shift->is_map();) };
1760: if ($args->{'sort'} eq 'title') {
1761: my $oldFilterFunc = $filterFunc;
1762: my $filterFunc=
1763: sub {
1764: my ($res)=@_;
1765: if ($res->is_map()) { return 0;}
1766: return &$oldFilterFunc($res);
1767: };
1768: @resources=$navmap->retrieveResources(undef,$filterFunc);
1769: @resources= sort { &cmp_title($a,$b) } @resources;
1770: } elsif ($args->{'sort'} eq 'duedate') {
1771: my $oldFilterFunc = $filterFunc;
1772: my $filterFunc=
1773: sub {
1774: my ($res)=@_;
1775: if (!$res->is_problem()) { return 0;}
1776: return &$oldFilterFunc($res);
1777: };
1778: @resources=$navmap->retrieveResources(undef,$filterFunc);
1779: @resources= sort {
1780: if ($a->duedate ne $b->duedate) {
1781: return $a->duedate cmp $b->duedate;
1782: }
1783: my $value=&cmp_title($a,$b);
1784: return $value;
1785: } @resources;
1786: } elsif ($args->{'sort'} eq 'discussion') {
1787: my $oldFilterFunc = $filterFunc;
1788: my $filterFunc=
1789: sub {
1790: my ($res)=@_;
1791: if (!$res->hasDiscussion() &&
1792: !$res->getFeedback() &&
1793: !$res->getErrors()) { return 0;}
1794: return &$oldFilterFunc($res);
1795: };
1796: @resources=$navmap->retrieveResources(undef,$filterFunc);
1797: @resources= sort { &cmp_title($a,$b) } @resources;
1798: } else {
1799: #unknow sort mechanism or default
1800: undef($args->{'sort'});
1801: }
1802:
1803:
1804: while (1) {
1805: if ($args->{'sort'}) {
1806: $curRes = shift(@resources);
1807: } else {
1808: $curRes = $it->next($closeAllPages);
1809: }
1810: if (!$curRes) { last; }
1811:
1812: # Maintain indentation level.
1813: if ($curRes == $it->BEGIN_MAP() ||
1814: $curRes == $it->BEGIN_BRANCH() ) {
1815: $args->{'indentLevel'}++;
1816: }
1817: if ($curRes == $it->END_MAP() ||
1818: $curRes == $it->END_BRANCH() ) {
1819: $args->{'indentLevel'}--;
1820: }
1821: # Notice new branches
1822: if ($curRes == $it->BEGIN_BRANCH()) {
1823: $args->{'isNewBranch'} = 1;
1824: }
1825:
1826: # If this isn't an actual resource, continue on
1827: if (!ref($curRes)) {
1828: next;
1829: }
1830:
1831: # If this has been filtered out, continue on
1832: if (!(&$filterFunc($curRes))) {
1833: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1834: next;
1835: }
1836:
1837: # If this is an empty sequence and we're filtering them, continue on
1838: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1839: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1840: next;
1841: }
1842:
1843: # If we're suppressing navmaps and this is a navmap, continue on
1844: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1845: next;
1846: }
1847:
1848: $args->{'counter'}++;
1849:
1850: # Does it have multiple parts?
1851: $args->{'multipart'} = 0;
1852: $args->{'condensed'} = 0;
1853: my @parts;
1854:
1855: # Decide what parts to show.
1856: if ($curRes->is_problem() && $showParts) {
1857: @parts = @{$curRes->parts()};
1858: $args->{'multipart'} = $curRes->multipart();
1859:
1860: if ($condenseParts) { # do the condensation
1861: if (!$args->{'condensed'}) {
1862: # Decide whether to condense based on similarity
1863: my $status = $curRes->status($parts[0]);
1864: my $due = $curRes->duedate($parts[0]);
1865: my $open = $curRes->opendate($parts[0]);
1866: my $statusAllSame = 1;
1867: my $dueAllSame = 1;
1868: my $openAllSame = 1;
1869: for (my $i = 1; $i < scalar(@parts); $i++) {
1870: if ($curRes->status($parts[$i]) != $status){
1871: $statusAllSame = 0;
1872: }
1873: if ($curRes->duedate($parts[$i]) != $due ) {
1874: $dueAllSame = 0;
1875: }
1876: if ($curRes->opendate($parts[$i]) != $open) {
1877: $openAllSame = 0;
1878: }
1879: }
1880: # $*allSame is true if all the statuses were
1881: # the same. Now, if they are all the same and
1882: # match one of the statuses to condense, or they
1883: # are all open with the same due date, or they are
1884: # all OPEN_LATER with the same open date, display the
1885: # status of the first non-zero part (to get the 'correct'
1886: # status right, since 0 is never 'correct' or 'open').
1887: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1888: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1889: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1890: @parts = ($parts[0]);
1891: $args->{'condensed'} = 1;
1892: }
1893: }
1894: # Multipart problem with one part: always "condense" (happens
1895: # to match the desirable behavior)
1896: if ($curRes->countParts() == 1) {
1897: @parts = ($parts[0]);
1898: $args->{'condensed'} = 1;
1899: }
1900: }
1901: }
1902:
1903: # If the multipart problem was condensed, "forget" it was multipart
1904: if (scalar(@parts) == 1) {
1905: $args->{'multipart'} = 0;
1906: } else {
1907: # Add part 0 so we display it correctly.
1908: unshift @parts, '0';
1909: }
1910:
1911: {
1912: my ($src,$symb,$anchor,$stack);
1913: if ($args->{'sort'}) {
1914: my $it = $navmap->getIterator(undef, undef, undef, 1);
1915: while ( my $res=$it->next()) {
1916: if (ref($res) &&
1917: $res->symb() eq $curRes->symb()) { last; }
1918: }
1919: $stack=$it->getStack();
1920: } else {
1921: $stack=$it->getStack();
1922: }
1923: ($src,$symb,$anchor)=getLinkForResource($stack);
1924: if (defined($anchor)) { $anchor='#'.$anchor; }
1925: my $srcHasQuestion = $src =~ /\?/;
1926: $args->{"resourceLink"} = $src.
1927: ($srcHasQuestion?'&':'?') .
1928: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1929: }
1930: # Now, we've decided what parts to show. Loop through them and
1931: # show them.
1932: foreach my $part (@parts) {
1933: $rownum ++;
1934: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1935:
1936: $result .= " <tr bgcolor='$backgroundColor'>\n";
1937:
1938: # Set up some data about the parts that the cols might want
1939: my $filter = $it->{FILTER};
1940:
1941: # Now, display each column.
1942: foreach my $col (@$cols) {
1943: my $colHTML = '';
1944: if (ref($col)) {
1945: $colHTML .= &$col($curRes, $part, $args);
1946: } else {
1947: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1948: }
1949:
1950: # If this is the first column and it's time to print
1951: # the anchor, do so
1952: if ($col == $cols->[0] &&
1953: $args->{'counter'} == $args->{'currentJumpIndex'} -
1954: $currentJumpDelta) {
1955: # Jam the anchor after the <td> tag;
1956: # necessary for valid HTML (which Mozilla requires)
1957: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1958: $displayedJumpMarker = 1;
1959: }
1960: $result .= $colHTML . "\n";
1961: }
1962: $result .= " </tr>\n";
1963: $args->{'isNewBranch'} = 0;
1964: }
1965:
1966: if ($r && $rownum % 20 == 0) {
1967: $r->print($result);
1968: $result = "";
1969: $r->rflush();
1970: }
1971: } continue {
1972: if ($r) {
1973: # If we have the connection, make sure the user is still connected
1974: my $c = $r->connection;
1975: if ($c->aborted()) {
1976: # Who cares what we do, nobody will see it anyhow.
1977: return '';
1978: }
1979: }
1980: }
1981:
1982: # Print out the part that jumps to #curloc if it exists
1983: # delay needed because the browser is processing the jump before
1984: # it finishes rendering, so it goes to the wrong place!
1985: # onload might be better, but this routine has no access to that.
1986: # On mozilla, the 0-millisecond timeout seems to prevent this;
1987: # it's quite likely this might fix other browsers, too, and
1988: # certainly won't hurt anything.
1989: if ($displayedJumpMarker) {
1990: $result .= "
1991: <script>
1992: if (location.href.indexOf('#curloc')==-1) {
1993: setTimeout(\"location += '#curloc';\", 0)
1994: }
1995: </script>";
1996: }
1997:
1998: $result .= "</table>";
1999:
2000: if ($r) {
2001: $r->print($result);
2002: $result = "";
2003: $r->rflush();
2004: }
2005:
2006: return $result;
2007: }
2008:
2009: sub add_linkitem {
2010: my ($linkitems,$name,$cmd,$text)=@_;
2011: $$linkitems{$name}{'cmd'}=$cmd;
2012: $$linkitems{$name}{'text'}=&mt($text);
2013: }
2014:
2015: sub show_linkitems {
2016: my ($linkitems)=@_;
2017: my @linkorder = ("blank","launchnav","closenav","firsthomework",
2018: "everything","uncompleted","changefolder","clearbubbles");
2019:
2020: my $result .= (<<ENDBLOCK);
2021: <td align="left">
2022: <script type="text/javascript">
2023: function changeNavDisplay () {
2024: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
2025: ENDBLOCK
2026: foreach my $link (@linkorder) {
2027: $result.= "if (navchoice == '$link') {".
2028: $linkitems->{$link}{'cmd'}."}\n";
2029: }
2030: $result.='}
2031: </script>
2032: <form name="linkitems" method="post">
2033: <nobr><select name="toplink">'."\n";
2034: foreach my $link (@linkorder) {
2035: if (defined($linkitems->{$link})) {
2036: if ($linkitems->{$link}{'text'} ne '') {
2037: $result .= ' <option value="'.$link.'">'.
2038: $linkitems->{$link}{'text'}."</option>\n";
2039: }
2040: }
2041: }
2042: $result .= '</select> <input type="button" name="chgnav"
2043: value="Go" onClick="javascript:changeNavDisplay()" />
2044: </nobr></form></td>'."\n";
2045:
2046: return $result;
2047: }
2048:
2049: 1;
2050:
2051: package Apache::lonnavmaps::navmap;
2052:
2053: =pod
2054:
2055: =head1 Object: Apache::lonnavmaps::navmap
2056:
2057: =head2 Overview
2058:
2059: The navmap object's job is to provide access to the resources
2060: in the course as Apache::lonnavmaps::resource objects, and to
2061: query and manage the relationship between those resource objects.
2062:
2063: Generally, you'll use the navmap object in one of three basic ways.
2064: In order of increasing complexity and power:
2065:
2066: =over 4
2067:
2068: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2069: various ways to obtain resource objects, based on various identifiers.
2070: Use this when you want to request information about one object or
2071: a handful of resources you already know the identities of, from some
2072: other source. For more about Ids, Symbs, and MapPcs, see the
2073: Resource documentation. Note that Url should be a B<last resort>,
2074: not your first choice; it only works when there is only one
2075: instance of the resource in the course, which only applies to
2076: maps, and even that may change in the future.
2077:
2078: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2079: retrieves resources matching some criterion and returns them
2080: in a flat array, with no structure information. Use this when
2081: you are manipulating a series of resources, based on what map
2082: the are in, but do not care about branching, or exactly how
2083: the maps and resources are related. This is the most common case.
2084:
2085: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2086: the course's navmap in various ways without writing the traversal
2087: code yourself. See iterator documentation below. Use this when
2088: you need to know absolutely everything about the course, including
2089: branches and the precise relationship between maps and resources.
2090:
2091: =back
2092:
2093: =head2 Creation And Destruction
2094:
2095: To create a navmap object, use the following function:
2096:
2097: =over 4
2098:
2099: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2100:
2101: Creates a new navmap object. Returns the navmap object if this is
2102: successful, or B<undef> if not.
2103:
2104: =back
2105:
2106: =head2 Methods
2107:
2108: =over 4
2109:
2110: =item * B<getIterator>(first, finish, filter, condition):
2111:
2112: See iterator documentation below.
2113:
2114: =cut
2115:
2116: use strict;
2117: use GDBM_File;
2118: use Apache::lonnet;
2119:
2120: sub new {
2121: # magic invocation to create a class instance
2122: my $proto = shift;
2123: my $class = ref($proto) || $proto;
2124: my $self = {};
2125:
2126: # Resource cache stores navmap resources as we reference them. We generate
2127: # them on-demand so we don't pay for creating resources unless we use them.
2128: $self->{RESOURCE_CACHE} = {};
2129:
2130: # Network failure flag, if we accessed the course or user opt and
2131: # failed
2132: $self->{NETWORK_FAILURE} = 0;
2133:
2134: # tie the nav hash
2135:
2136: my %navmaphash;
2137: my %parmhash;
2138: my $courseFn = $env{"request.course.fn"};
2139: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2140: &GDBM_READER(), 0640))) {
2141: return undef;
2142: }
2143:
2144: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2145: &GDBM_READER(), 0640)))
2146: {
2147: untie %{$self->{PARM_HASH}};
2148: return undef;
2149: }
2150:
2151: $self->{NAV_HASH} = \%navmaphash;
2152: $self->{PARM_HASH} = \%parmhash;
2153: $self->{PARM_CACHE} = {};
2154:
2155: bless($self);
2156:
2157: return $self;
2158: }
2159:
2160: sub generate_course_user_opt {
2161: my $self = shift;
2162: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2163:
2164: my $uname=$env{'user.name'};
2165: my $udom=$env{'user.domain'};
2166: my $cid=$env{'request.course.id'};
2167: my $cdom=$env{'course.'.$cid.'.domain'};
2168: my $cnum=$env{'course.'.$cid.'.num'};
2169:
2170: # ------------------------------------------------- Get coursedata (if present)
2171: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2172: # Check for network failure
2173: if (!ref($courseopt)) {
2174: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2175: $self->{NETWORK_FAILURE} = 1;
2176: }
2177: undef($courseopt);
2178: }
2179:
2180: # --------------------------------------------------- Get userdata (if present)
2181:
2182: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2183: # Check for network failure
2184: if (!ref($useropt)) {
2185: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2186: $self->{NETWORK_FAILURE} = 1;
2187: }
2188: undef($useropt);
2189: }
2190:
2191: $self->{COURSE_OPT} = $courseopt;
2192: $self->{USER_OPT} = $useropt;
2193:
2194: $self->{COURSE_USER_OPT_GENERATED} = 1;
2195:
2196: return;
2197: }
2198:
2199: sub generate_email_discuss_status {
2200: my $self = shift;
2201: my $symb = shift;
2202: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2203:
2204: my $cid=$env{'request.course.id'};
2205: my $cdom=$env{'course.'.$cid.'.domain'};
2206: my $cnum=$env{'course.'.$cid.'.num'};
2207:
2208: my %emailstatus = &Apache::lonnet::dump('email_status');
2209: my $logoutTime = $emailstatus{'logout'};
2210: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2211: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2212: $courseLeaveTime : $logoutTime);
2213: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2214: $cdom, $cnum);
2215: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2216: $env{'user.domain'},$env{'user.name'},'lastread');
2217: my %lastreadtime = ();
2218: foreach (keys %lastread) {
2219: my $key = $_;
2220: $key =~ s/_lastread$//;
2221: $lastreadtime{$key} = $lastread{$_};
2222: }
2223:
2224: my %feedback=();
2225: my %error=();
2226: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2227: $env{'user.name'});
2228:
2229: foreach my $msgid (@keys) {
2230: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2231: my $plain=
2232: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2233: if ($plain=~/ \[([^\]]+)\]\:/) {
2234: my $url=$1;
2235: if ($plain=~/\:Error \[/) {
2236: $error{$url}.=','.$msgid;
2237: } else {
2238: $feedback{$url}.=','.$msgid;
2239: }
2240: }
2241: }
2242: }
2243:
2244: #url's of resources that have feedbacks
2245: $self->{FEEDBACK} = \%feedback;
2246: #or errors
2247: $self->{ERROR_MSG} = \%error;
2248: $self->{DISCUSSION_TIME} = \%discussiontime;
2249: $self->{EMAIL_STATUS} = \%emailstatus;
2250: $self->{LAST_READ} = \%lastreadtime;
2251:
2252: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2253: }
2254:
2255: sub get_user_data {
2256: my $self = shift;
2257: if ($self->{RETRIEVED_USER_DATA}) { return; }
2258:
2259: # Retrieve performance data on problems
2260: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2261: $env{'user.domain'},
2262: $env{'user.name'});
2263: $self->{STUDENT_DATA} = \%student_data;
2264:
2265: $self->{RETRIEVED_USER_DATA} = 1;
2266: }
2267:
2268: # Internal function: Takes a key to look up in the nav hash and implements internal
2269: # memory caching of that key.
2270: sub navhash {
2271: my $self = shift; my $key = shift;
2272: return $self->{NAV_HASH}->{$key};
2273: }
2274:
2275: =pod
2276:
2277: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2278: false otherwise. Undefined course maps indicate an error somewhere in
2279: LON-CAPA, and you will not be able to proceed with using the navmap.
2280: See the B<NAV> screen for an example of using this.
2281:
2282: =cut
2283:
2284: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2285: sub courseMapDefined {
2286: my $self = shift;
2287: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2288:
2289: my $firstres = $self->navhash("map_start_$uri");
2290: my $lastres = $self->navhash("map_finish_$uri");
2291: return $firstres && $lastres;
2292: }
2293:
2294: sub getIterator {
2295: my $self = shift;
2296: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2297: shift, undef, shift,
2298: shift, shift);
2299: return $iterator;
2300: }
2301:
2302: # Private method: Does the given resource (as a symb string) have
2303: # current discussion? Returns 0 if chat/mail data not extracted.
2304: sub hasDiscussion {
2305: my $self = shift;
2306: my $symb = shift;
2307: $self->generate_email_discuss_status();
2308:
2309: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2310:
2311: #return defined($self->{DISCUSSION_TIME}->{$symb});
2312:
2313: # backward compatibility (bulletin boards used to be 'wrapped')
2314: my $ressymb = $self->wrap_symb($symb);
2315: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2316: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2317: } else {
2318: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2319: 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).
2320: }
2321: }
2322:
2323: sub wrap_symb {
2324: my $self = shift;
2325: my $symb = shift;
2326: if ($symb =~ m-___(adm/\w+/\w+/)(\d+)(/bulletinboard)$-) {
2327: unless ($symb =~ m|adm/wrapper/adm|) {
2328: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2329: }
2330: }
2331: return $symb;
2332: }
2333:
2334: # Private method: Does the given resource (as a symb string) have
2335: # current feedback? Returns the string in the feedback hash, which
2336: # will be false if it does not exist.
2337:
2338: sub getFeedback {
2339: my $self = shift;
2340: my $symb = shift;
2341:
2342: $self->generate_email_discuss_status();
2343:
2344: if (!defined($self->{FEEDBACK})) { return ""; }
2345:
2346: return $self->{FEEDBACK}->{$symb};
2347: }
2348:
2349: # Private method: Get the errors for that resource (by source).
2350: sub getErrors {
2351: my $self = shift;
2352: my $src = shift;
2353:
2354: $self->generate_email_discuss_status();
2355:
2356: if (!defined($self->{ERROR_MSG})) { return ""; }
2357: return $self->{ERROR_MSG}->{$src};
2358: }
2359:
2360: =pod
2361:
2362: =item * B<getById>(id):
2363:
2364: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2365: object for that resource. This method, or other methods that use it
2366: (as in the resource object) is the only proper way to obtain a
2367: resource object.
2368:
2369: =item * B<getBySymb>(symb):
2370:
2371: Based on the symb of the resource, get a resource object for that
2372: resource. This is one of the proper ways to get a resource object.
2373:
2374: =item * B<getMapByMapPc>(map_pc):
2375:
2376: Based on the map_pc of the resource, get a resource object for
2377: the given map. This is one of the proper ways to get a resource object.
2378:
2379: =cut
2380:
2381: # The strategy here is to cache the resource objects, and only construct them
2382: # as we use them. The real point is to prevent reading any more from the tied
2383: # hash then we have to, which should hopefully alleviate speed problems.
2384:
2385: sub getById {
2386: my $self = shift;
2387: my $id = shift;
2388:
2389: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2390: {
2391: return $self->{RESOURCE_CACHE}->{$id};
2392: }
2393:
2394: # resource handles inserting itself into cache.
2395: # Not clear why the quotes are necessary, but as of this
2396: # writing it doesn't work without them.
2397: return "Apache::lonnavmaps::resource"->new($self, $id);
2398: }
2399:
2400: sub getBySymb {
2401: my $self = shift;
2402: my $symb = shift;
2403:
2404: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2405: my $map = $self->getResourceByUrl($mapUrl);
2406: my $returnvalue = undef;
2407: if (ref($map)) {
2408: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2409: }
2410: return $returnvalue;
2411: }
2412:
2413: sub getByMapPc {
2414: my $self = shift;
2415: my $map_pc = shift;
2416: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2417: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2418: return $self->getById($map_id);
2419: }
2420:
2421: =pod
2422:
2423: =item * B<firstResource>():
2424:
2425: Returns a resource object reference corresponding to the first
2426: resource in the navmap.
2427:
2428: =cut
2429:
2430: sub firstResource {
2431: my $self = shift;
2432: my $firstResource = $self->navhash('map_start_' .
2433: &Apache::lonnet::clutter($env{'request.course.uri'}));
2434: return $self->getById($firstResource);
2435: }
2436:
2437: =pod
2438:
2439: =item * B<finishResource>():
2440:
2441: Returns a resource object reference corresponding to the last resource
2442: in the navmap.
2443:
2444: =cut
2445:
2446: sub finishResource {
2447: my $self = shift;
2448: my $firstResource = $self->navhash('map_finish_' .
2449: &Apache::lonnet::clutter($env{'request.course.uri'}));
2450: return $self->getById($firstResource);
2451: }
2452:
2453: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2454: # the actual lookup; parmval caches the results.
2455: sub parmval {
2456: my $self = shift;
2457: my ($what,$symb)=@_;
2458: my $hashkey = $what."|||".$symb;
2459:
2460: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2461: return $self->{PARM_CACHE}->{$hashkey};
2462: }
2463:
2464: my $result = $self->parmval_real($what, $symb);
2465: $self->{PARM_CACHE}->{$hashkey} = $result;
2466: return $result;
2467: }
2468:
2469: sub parmval_real {
2470: my $self = shift;
2471: my ($what,$symb,$recurse) = @_;
2472:
2473: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2474: $self->generate_course_user_opt();
2475:
2476: my $cid=$env{'request.course.id'};
2477: my $csec=$env{'request.course.sec'};
2478: my $uname=$env{'user.name'};
2479: my $udom=$env{'user.domain'};
2480:
2481: unless ($symb) { return ''; }
2482: my $result='';
2483:
2484: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2485:
2486: # ----------------------------------------------------- Cascading lookup scheme
2487: my $rwhat=$what;
2488: $what=~s/^parameter\_//;
2489: $what=~s/\_/\./;
2490:
2491: my $symbparm=$symb.'.'.$what;
2492: my $mapparm=$mapname.'___(all).'.$what;
2493: my $usercourseprefix=$cid;
2494:
2495: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2496: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2497: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2498:
2499: my $courselevel= $usercourseprefix.'.'.$what;
2500: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2501: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2502:
2503: my $useropt = $self->{USER_OPT};
2504: my $courseopt = $self->{COURSE_OPT};
2505: my $parmhash = $self->{PARM_HASH};
2506:
2507: # ---------------------------------------------------------- first, check user
2508: if ($uname and defined($useropt)) {
2509: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2510: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2511: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2512: }
2513:
2514: # ------------------------------------------------------- second, check course
2515: if ($csec and defined($courseopt)) {
2516: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2517: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2518: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2519: }
2520:
2521: if (defined($courseopt)) {
2522: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2523: }
2524:
2525: # ----------------------------------------------------- third, check map parms
2526:
2527: my $thisparm=$$parmhash{$symbparm};
2528: if (defined($thisparm)) { return $thisparm; }
2529:
2530: # ----------------------------------------------------- fourth , check default
2531:
2532: my $meta_rwhat=$rwhat;
2533: $meta_rwhat=~s/\./_/g;
2534: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2535: if (defined($default)) { return $default}
2536: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2537: if (defined($default)) { return $default}
2538:
2539: # --------------------------------------------------- fifth, check more course
2540: if (defined($courseopt)) {
2541: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2542: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2543: }
2544:
2545: # --------------------------------------------------- sixth , cascade up parts
2546:
2547: my ($space,@qualifier)=split(/\./,$rwhat);
2548: my $qualifier=join('.',@qualifier);
2549: unless ($space eq '0') {
2550: my @parts=split(/_/,$space);
2551: my $id=pop(@parts);
2552: my $part=join('_',@parts);
2553: if ($part eq '') { $part='0'; }
2554: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2555: if (defined($partgeneral)) { return $partgeneral; }
2556: }
2557: if ($recurse) { return undef; }
2558: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2559: if (defined($pack_def)) { return $pack_def; }
2560: return '';
2561: }
2562:
2563: =pod
2564:
2565: =item * B<getResourceByUrl>(url,multiple):
2566:
2567: Retrieves a resource object by URL of the resource, unless the optional
2568: multiple parameter is included in wahich caes an array of resource
2569: objects is returned. If passed a resource object, it will simply return
2570: it, so it is safe to use this method in code like
2571: "$res = $navmap->getResourceByUrl($res)"
2572: if you're not sure if $res is already an object, or just a URL. If the
2573: resource appears multiple times in the course, only the first instance
2574: will be returned (useful for maps), unless the multiple parameter has
2575: been included, in which case all instances are returned in an array.
2576:
2577: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2578:
2579: The map is a specification of a map to retreive the resources from,
2580: either as a url or as an object. The filterFunc is a reference to a
2581: function that takes a resource object as its one argument and returns
2582: true if the resource should be included, or false if it should not
2583: be. If recursive is true, the map will be recursively examined,
2584: otherwise it will not be. If bailout is true, the function will return
2585: as soon as it finds a resource, if false it will finish. If showall is
2586: true it will not hide maps that contain nothing but one other map. By
2587: default, the map is the top-level map of the course, filterFunc is a
2588: function that always returns 1, recursive is true, bailout is false,
2589: showall is false. The resources will be returned in a list containing
2590: the resource objects for the corresponding resources, with B<no
2591: structure information> in the list; regardless of branching,
2592: recursion, etc., it will be a flat list.
2593:
2594: Thus, this is suitable for cases where you don't want the structure,
2595: just a list of all resources. It is also suitable for finding out how
2596: many resources match a given description; for this use, if all you
2597: want to know is if I<any> resources match the description, the bailout
2598: parameter will allow you to avoid potentially expensive enumeration of
2599: all matching resources.
2600:
2601: =item * B<hasResource>(map, filterFunc, recursive, showall):
2602:
2603: Convience method for
2604:
2605: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2606:
2607: which will tell whether the map has resources matching the description
2608: in the filter function.
2609:
2610: =item * B<usedVersion>(url):
2611:
2612: Retrieves version infomation for a url. Returns the version (a number, or
2613: the string "mostrecent") for resources which have version information in
2614: the big hash.
2615:
2616: =cut
2617:
2618:
2619: sub getResourceByUrl {
2620: my $self = shift;
2621: my $resUrl = shift;
2622: my $multiple = shift;
2623:
2624: if (ref($resUrl)) { return $resUrl; }
2625:
2626: $resUrl = &Apache::lonnet::clutter($resUrl);
2627: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2628: if (!$resId) { return ''; }
2629: if ($multiple) {
2630: my @resources = ();
2631: my @resIds = split (/,/, $resId);
2632: foreach my $id (@resIds) {
2633: my $resourceId = $self->getById($id);
2634: if ($resourceId) {
2635: push(@resources,$resourceId);
2636: }
2637: }
2638: return @resources;
2639: } else {
2640: if ($resId =~ /,/) {
2641: $resId = (split (/,/, $resId))[0];
2642: }
2643: return $self->getById($resId);
2644: }
2645: }
2646:
2647: sub retrieveResources {
2648: my $self = shift;
2649: my $map = shift;
2650: my $filterFunc = shift;
2651: if (!defined ($filterFunc)) {
2652: $filterFunc = sub {return 1;};
2653: }
2654: my $recursive = shift;
2655: if (!defined($recursive)) { $recursive = 1; }
2656: my $bailout = shift;
2657: if (!defined($bailout)) { $bailout = 0; }
2658: my $showall = shift;
2659: # Create the necessary iterator.
2660: if (!ref($map)) { # assume it's a url of a map.
2661: $map = $self->getResourceByUrl($map);
2662: }
2663:
2664: # If nothing was passed, assume top-level map
2665: if (!$map) {
2666: $map = $self->getById('0.0');
2667: }
2668:
2669: # Check the map's validity.
2670: if (!$map->is_map()) {
2671: # Oh, to throw an exception.... how I'd love that!
2672: return ();
2673: }
2674:
2675: # Get an iterator.
2676: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2677: undef, $recursive, $showall);
2678:
2679: my @resources = ();
2680:
2681: # Run down the iterator and collect the resources.
2682: my $curRes;
2683:
2684: while ($curRes = $it->next()) {
2685: if (ref($curRes)) {
2686: if (!&$filterFunc($curRes)) {
2687: next;
2688: }
2689:
2690: push @resources, $curRes;
2691:
2692: if ($bailout) {
2693: return @resources;
2694: }
2695: }
2696:
2697: }
2698:
2699: return @resources;
2700: }
2701:
2702: sub hasResource {
2703: my $self = shift;
2704: my $map = shift;
2705: my $filterFunc = shift;
2706: my $recursive = shift;
2707: my $showall = shift;
2708:
2709: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2710: }
2711:
2712: sub usedVersion {
2713: my $self = shift;
2714: my $linkurl = shift;
2715: return $self->navhash("version_$linkurl");
2716: }
2717:
2718: 1;
2719:
2720: package Apache::lonnavmaps::iterator;
2721: use WeakRef;
2722: use Apache::lonnet;
2723:
2724: =pod
2725:
2726: =back
2727:
2728: =head1 Object: navmap Iterator
2729:
2730: An I<iterator> encapsulates the logic required to traverse a data
2731: structure. navmap uses an iterator to traverse the course map
2732: according to the criteria you wish to use.
2733:
2734: To obtain an iterator, call the B<getIterator>() function of a
2735: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2736: directly.) This will return a reference to the iterator:
2737:
2738: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2739:
2740: To get the next thing from the iterator, call B<next>:
2741:
2742: C<my $nextThing = $resourceIterator-E<gt>next()>
2743:
2744: getIterator behaves as follows:
2745:
2746: =over 4
2747:
2748: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2749:
2750: All parameters are optional. firstResource is a resource reference
2751: corresponding to where the iterator should start. It defaults to
2752: navmap->firstResource() for the corresponding nav map. finishResource
2753: corresponds to where you want the iterator to end, defaulting to
2754: navmap->finishResource(). filterHash is a hash used as a set
2755: containing strings representing the resource IDs, defaulting to
2756: empty. Condition is a 1 or 0 that sets what to do with the filter
2757: hash: If a 0, then only resources that exist IN the filterHash will be
2758: recursed on. If it is a 1, only resources NOT in the filterHash will
2759: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2760: false (default), the iterator will only return the first level of map
2761: that is not just a single, 'redirecting' map. If true, the iterator
2762: will return all information, starting with the top-level map,
2763: regardless of content. returnTopMap, if true (default false), will
2764: cause the iterator to return the top-level map object (resource 0.0)
2765: before anything else.
2766:
2767: Thus, by default, only top-level resources will be shown. Change the
2768: condition to a 1 without changing the hash, and all resources will be
2769: shown. Changing the condition to 1 and including some values in the
2770: hash will allow you to selectively suppress parts of the navmap, while
2771: leaving it on 0 and adding things to the hash will allow you to
2772: selectively add parts of the nav map. See the handler code for
2773: examples.
2774:
2775: The iterator will return either a reference to a resource object, or a
2776: token representing something in the map, such as the beginning of a
2777: new branch. The possible tokens are:
2778:
2779: =over 4
2780:
2781: =item * B<END_ITERATOR>:
2782:
2783: The iterator has returned all that it's going to. Further calls to the
2784: iterator will just produce more of these. This is a "false" value, and
2785: is the only false value the iterator which will be returned, so it can
2786: be used as a loop sentinel.
2787:
2788: =item * B<BEGIN_MAP>:
2789:
2790: A new map is being recursed into. This is returned I<after> the map
2791: resource itself is returned.
2792:
2793: =item * B<END_MAP>:
2794:
2795: The map is now done.
2796:
2797: =item * B<BEGIN_BRANCH>:
2798:
2799: A branch is now starting. The next resource returned will be the first
2800: in that branch.
2801:
2802: =item * B<END_BRANCH>:
2803:
2804: The branch is now done.
2805:
2806: =back
2807:
2808: The tokens are retreivable via methods on the iterator object, i.e.,
2809: $iterator->END_MAP.
2810:
2811: Maps can contain empty resources. The iterator will automatically skip
2812: over such resources, but will still treat the structure
2813: correctly. Thus, a complicated map with several branches, but
2814: consisting entirely of empty resources except for one beginning or
2815: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2816: but only one resource will be returned.
2817:
2818: =back
2819:
2820: =head2 Normal Usage
2821:
2822: Normal usage of the iterator object is to do the following:
2823:
2824: my $it = $navmap->getIterator([your params here]);
2825: my $curRes;
2826: while ($curRes = $it->next()) {
2827: [your logic here]
2828: }
2829:
2830: Note that inside of the loop, it's frequently useful to check if
2831: "$curRes" is a reference or not with the reference function; only
2832: resource objects will be references, and any non-references will
2833: be the tokens described above.
2834:
2835: Also note there is some old code floating around that trys to track
2836: the depth of the iterator to see when it's done; do not copy that
2837: code. It is difficult to get right and harder to understand then
2838: this. They should be migrated to this new style.
2839:
2840: =cut
2841:
2842: # Here are the tokens for the iterator:
2843:
2844: sub END_ITERATOR { return 0; }
2845: sub BEGIN_MAP { return 1; } # begining of a new map
2846: sub END_MAP { return 2; } # end of the map
2847: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2848: sub END_BRANCH { return 4; } # end of a branch
2849: sub FORWARD { return 1; } # go forward
2850: sub BACKWARD { return 2; }
2851:
2852: sub min {
2853: (my $a, my $b) = @_;
2854: if ($a < $b) { return $a; } else { return $b; }
2855: }
2856:
2857: sub new {
2858: # magic invocation to create a class instance
2859: my $proto = shift;
2860: my $class = ref($proto) || $proto;
2861: my $self = {};
2862:
2863: weaken($self->{NAV_MAP} = shift);
2864: return undef unless ($self->{NAV_MAP});
2865:
2866: # Handle the parameters
2867: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2868: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2869:
2870: # If the given resources are just the ID of the resource, get the
2871: # objects
2872: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2873: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2874: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2875: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2876:
2877: $self->{FILTER} = shift;
2878:
2879: # A hash, used as a set, of resource already seen
2880: $self->{ALREADY_SEEN} = shift;
2881: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2882: $self->{CONDITION} = shift;
2883:
2884: # Do we want to automatically follow "redirection" maps?
2885: $self->{FORCE_TOP} = shift;
2886:
2887: # Do we want to return the top-level map object (resource 0.0)?
2888: $self->{RETURN_0} = shift;
2889: # have we done that yet?
2890: $self->{HAVE_RETURNED_0} = 0;
2891:
2892: # Now, we need to pre-process the map, by walking forward and backward
2893: # over the parts of the map we're going to look at.
2894:
2895: # The processing steps are exactly the same, except for a few small
2896: # changes, so I bundle those up in the following list of two elements:
2897: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2898: # first_resource).
2899: # This prevents writing nearly-identical code twice.
2900: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2901: 'FIRST_RESOURCE'],
2902: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2903: 'FINISH_RESOURCE'] );
2904:
2905: my $maxDepth = 0; # tracks max depth
2906:
2907: # If there is only one resource in this map, and it's a map, we
2908: # want to remember that, so the user can ask for the first map
2909: # that isn't just a redirector.
2910: my $resource; my $resourceCount = 0;
2911:
2912: # Documentation on this algorithm can be found in the CVS repository at
2913: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2914: # in that file.
2915: # **1**
2916:
2917: foreach my $pass (@iterations) {
2918: my $direction = $pass->[0];
2919: my $valName = $pass->[1];
2920: my $nextResourceMethod = $pass->[2];
2921: my $firstResourceName = $pass->[3];
2922:
2923: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2924: $self->{FIRST_RESOURCE},
2925: $self->{FINISH_RESOURCE},
2926: {}, undef, 0, $direction);
2927:
2928: # prime the recursion
2929: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2930: $iterator->next();
2931: my $curRes = $iterator->next();
2932: my $depth = 1;
2933: while ($depth > 0) {
2934: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2935: if ($curRes == $iterator->END_MAP()) { $depth--; }
2936:
2937: if (ref($curRes)) {
2938: # If there's only one resource, this will save it
2939: # we have to filter empty resources from consideration here,
2940: # or even "empty", redirecting maps have two (start & finish)
2941: # or three (start, finish, plus redirector)
2942: if($direction == FORWARD && $curRes->src()) {
2943: $resource = $curRes; $resourceCount++;
2944: }
2945: my $resultingVal = $curRes->{DATA}->{$valName};
2946: my $nextResources = $curRes->$nextResourceMethod();
2947: my $nextCount = scalar(@{$nextResources});
2948:
2949: if ($nextCount == 1) { # **3**
2950: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2951: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2952: }
2953:
2954: if ($nextCount > 1) { # **4**
2955: foreach my $res (@{$nextResources}) {
2956: my $current = $res->{DATA}->{$valName} || 999999999;
2957: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2958: }
2959: }
2960: }
2961:
2962: # Assign the final val (**2**)
2963: if (ref($curRes) && $direction == BACKWARD()) {
2964: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2965: $curRes->{DATA}->{BOT_UP_VAL});
2966:
2967: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2968: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2969: }
2970:
2971: $curRes = $iterator->next();
2972: }
2973: }
2974:
2975: # Check: Was this only one resource, a map?
2976: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2977: my $firstResource = $resource->map_start();
2978: my $finishResource = $resource->map_finish();
2979: return
2980: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2981: $finishResource, $self->{FILTER},
2982: $self->{ALREADY_SEEN},
2983: $self->{CONDITION},
2984: $self->{FORCE_TOP});
2985:
2986: }
2987:
2988: # Set up some bookkeeping information.
2989: $self->{CURRENT_DEPTH} = 0;
2990: $self->{MAX_DEPTH} = $maxDepth;
2991: $self->{STACK} = [];
2992: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2993: $self->{FINISHED} = 0; # When true, the iterator has finished
2994:
2995: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2996: push @{$self->{STACK}}, [];
2997: }
2998:
2999: # Prime the recursion w/ the first resource **5**
3000: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3001: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3002:
3003: bless ($self);
3004:
3005: return $self;
3006: }
3007:
3008: sub next {
3009: my $self = shift;
3010: my $closeAllPages=shift;
3011: if ($self->{FINISHED}) {
3012: return END_ITERATOR();
3013: }
3014:
3015: # If we want to return the top-level map object, and haven't yet,
3016: # do so.
3017: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3018: $self->{HAVE_RETURNED_0} = 1;
3019: return $self->{NAV_MAP}->getById('0.0');
3020: }
3021:
3022: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3023: # grab the next from the recursive iterator
3024: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3025:
3026: # is it a begin or end map? If so, update the depth
3027: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3028: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3029:
3030: # Are we back at depth 0? If so, stop recursing
3031: if ($self->{RECURSIVE_DEPTH} == 0) {
3032: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3033: }
3034:
3035: return $next;
3036: }
3037:
3038: if (defined($self->{FORCE_NEXT})) {
3039: my $tmp = $self->{FORCE_NEXT};
3040: $self->{FORCE_NEXT} = undef;
3041: return $tmp;
3042: }
3043:
3044: # Have we not yet begun? If not, return BEGIN_MAP and
3045: # remember we've started.
3046: if ( !$self->{STARTED} ) {
3047: $self->{STARTED} = 1;
3048: return $self->BEGIN_MAP();
3049: }
3050:
3051: # Here's the guts of the iterator.
3052:
3053: # Find the next resource, if any.
3054: my $found = 0;
3055: my $i = $self->{MAX_DEPTH};
3056: my $newDepth;
3057: my $here;
3058: while ( $i >= 0 && !$found ) {
3059: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3060: $here = pop @{$self->{STACK}->[$i]}; # **7**
3061: $found = 1;
3062: $newDepth = $i;
3063: }
3064: $i--;
3065: }
3066:
3067: # If we still didn't find anything, we're done.
3068: if ( !$found ) {
3069: # We need to get back down to the correct branch depth
3070: if ( $self->{CURRENT_DEPTH} > 0 ) {
3071: $self->{CURRENT_DEPTH}--;
3072: return END_BRANCH();
3073: } else {
3074: $self->{FINISHED} = 1;
3075: return END_MAP();
3076: }
3077: }
3078:
3079: # If this is not a resource, it must be an END_BRANCH marker we want
3080: # to return directly.
3081: if (!ref($here)) { # **8**
3082: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3083: $self->{CURRENT_DEPTH}--;
3084: return $here;
3085: }
3086: }
3087:
3088: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3089: $self->{HERE} = $here;
3090:
3091: # Get to the right level
3092: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3093: push @{$self->{STACK}->[$newDepth]}, $here;
3094: $self->{CURRENT_DEPTH}--;
3095: return END_BRANCH();
3096: }
3097: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3098: push @{$self->{STACK}->[$newDepth]}, $here;
3099: $self->{CURRENT_DEPTH}++;
3100: return BEGIN_BRANCH();
3101: }
3102:
3103: # If we made it here, we have the next resource, and we're at the
3104: # right branch level. So let's examine the resource for where
3105: # we can get to from here.
3106:
3107: # So we need to look at all the resources we can get to from here,
3108: # categorize them if we haven't seen them, remember if we have a new
3109: my $nextUnfiltered = $here->getNext();
3110: my $maxDepthAdded = -1;
3111:
3112: for (@$nextUnfiltered) {
3113: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3114: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3115: push @{$self->{STACK}->[$depth]}, $_;
3116: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3117: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3118: }
3119: }
3120:
3121: # Is this the end of a branch? If so, all of the resources examined above
3122: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3123: # marker onto the stack so we don't forget.
3124: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3125: # BC branch and gets to C, it will see F as the only next resource, but it's
3126: # one level lower. Thus, this is the end of the branch, since there are no
3127: # more resources added to this level or above.
3128: # We don't do this if the examined resource is the finish resource,
3129: # because the condition given above is true, but the "END_MAP" will
3130: # take care of things and we should already be at depth 0.
3131: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3132: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3133: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3134: }
3135:
3136: # That ends the main iterator logic. Now, do we want to recurse
3137: # down this map (if this resource is a map)?
3138: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3139: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3140: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3141: my $firstResource = $self->{HERE}->map_start();
3142: my $finishResource = $self->{HERE}->map_finish();
3143:
3144: $self->{RECURSIVE_ITERATOR} =
3145: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3146: $finishResource, $self->{FILTER},
3147: $self->{ALREADY_SEEN},
3148: $self->{CONDITION},
3149: $self->{FORCE_TOP});
3150: }
3151:
3152: # If this is a blank resource, don't actually return it.
3153: # Should you ever find you need it, make sure to add an option to the code
3154: # that you can use; other things depend on this behavior.
3155: my $browsePriv = $self->{HERE}->browsePriv();
3156: if (!$self->{HERE}->src() ||
3157: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3158: return $self->next($closeAllPages);
3159: }
3160:
3161: return $self->{HERE};
3162:
3163: }
3164:
3165: =pod
3166:
3167: The other method available on the iterator is B<getStack>, which
3168: returns an array populated with the current 'stack' of maps, as
3169: references to the resource objects. Example: This is useful when
3170: making the navigation map, as we need to check whether we are under a
3171: page map to see if we need to link directly to the resource, or to the
3172: page. The first elements in the array will correspond to the top of
3173: the stack (most inclusive map).
3174:
3175: =cut
3176:
3177: sub getStack {
3178: my $self=shift;
3179:
3180: my @stack;
3181:
3182: $self->populateStack(\@stack);
3183:
3184: return \@stack;
3185: }
3186:
3187: # Private method: Calls the iterators recursively to populate the stack.
3188: sub populateStack {
3189: my $self=shift;
3190: my $stack = shift;
3191:
3192: push @$stack, $self->{HERE} if ($self->{HERE});
3193:
3194: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3195: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3196: }
3197: }
3198:
3199: 1;
3200:
3201: package Apache::lonnavmaps::DFSiterator;
3202: use WeakRef;
3203: use Apache::lonnet;
3204:
3205: # Not documented in the perldoc: This is a simple iterator that just walks
3206: # through the nav map and presents the resources in a depth-first search
3207: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3208: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3209: # useful for pre-processing of some kind, and is in fact used by the main
3210: # iterator that way, but that's about it.
3211: # One could imagine merging this into the init routine of the main iterator,
3212: # but this might as well be left separate, since it is possible some other
3213: # use might be found for it. - Jeremy
3214:
3215: # Unlike the main iterator, this DOES return all resources, even blank ones.
3216: # The main iterator needs them to correctly preprocess the map.
3217:
3218: sub BEGIN_MAP { return 1; } # begining of a new map
3219: sub END_MAP { return 2; } # end of the map
3220: sub FORWARD { return 1; } # go forward
3221: sub BACKWARD { return 2; }
3222:
3223: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3224: # filter hash ref (or undef), already seen hash or undef, condition
3225: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3226: sub new {
3227: # magic invocation to create a class instance
3228: my $proto = shift;
3229: my $class = ref($proto) || $proto;
3230: my $self = {};
3231:
3232: weaken($self->{NAV_MAP} = shift);
3233: return undef unless ($self->{NAV_MAP});
3234:
3235: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3236: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3237:
3238: # If the given resources are just the ID of the resource, get the
3239: # objects
3240: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3241: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3242: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3243: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3244:
3245: $self->{FILTER} = shift;
3246:
3247: # A hash, used as a set, of resource already seen
3248: $self->{ALREADY_SEEN} = shift;
3249: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3250: $self->{CONDITION} = shift;
3251: $self->{DIRECTION} = shift || FORWARD();
3252:
3253: # Flag: Have we started yet?
3254: $self->{STARTED} = 0;
3255:
3256: # Should we continue calling the recursive iterator, if any?
3257: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3258: # The recursive iterator, if any
3259: $self->{RECURSIVE_ITERATOR} = undef;
3260: # Are we recursing on a map, or a branch?
3261: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3262: # And the count of how deep it is, so that this iterator can keep track of
3263: # when to pick back up again.
3264: $self->{RECURSIVE_DEPTH} = 0;
3265:
3266: # For keeping track of our branches, we maintain our own stack
3267: $self->{STACK} = [];
3268:
3269: # Start with the first resource
3270: if ($self->{DIRECTION} == FORWARD) {
3271: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3272: } else {
3273: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3274: }
3275:
3276: bless($self);
3277: return $self;
3278: }
3279:
3280: sub next {
3281: my $self = shift;
3282:
3283: # Are we using a recursive iterator? If so, pull from that and
3284: # watch the depth; we want to resume our level at the correct time.
3285: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3286: # grab the next from the recursive iterator
3287: my $next = $self->{RECURSIVE_ITERATOR}->next();
3288:
3289: # is it a begin or end map? Update depth if so
3290: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3291: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3292:
3293: # Are we back at depth 0? If so, stop recursing.
3294: if ($self->{RECURSIVE_DEPTH} == 0) {
3295: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3296: }
3297:
3298: return $next;
3299: }
3300:
3301: # Is there a current resource to grab? If not, then return
3302: # END_MAP, which will end the iterator.
3303: if (scalar(@{$self->{STACK}}) == 0) {
3304: return $self->END_MAP();
3305: }
3306:
3307: # Have we not yet begun? If not, return BEGIN_MAP and
3308: # remember that we've started.
3309: if ( !$self->{STARTED} ) {
3310: $self->{STARTED} = 1;
3311: return $self->BEGIN_MAP;
3312: }
3313:
3314: # Get the next resource in the branch
3315: $self->{HERE} = pop @{$self->{STACK}};
3316:
3317: # remember that we've seen this, so we don't return it again later
3318: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3319:
3320: # Get the next possible resources
3321: my $nextUnfiltered;
3322: if ($self->{DIRECTION} == FORWARD()) {
3323: $nextUnfiltered = $self->{HERE}->getNext();
3324: } else {
3325: $nextUnfiltered = $self->{HERE}->getPrevious();
3326: }
3327: my $next = [];
3328:
3329: # filter the next possibilities to remove things we've
3330: # already seen.
3331: foreach (@$nextUnfiltered) {
3332: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3333: push @$next, $_;
3334: }
3335: }
3336:
3337: while (@$next) {
3338: # copy the next possibilities over to the stack
3339: push @{$self->{STACK}}, shift @$next;
3340: }
3341:
3342: # If this is a map and we want to recurse down it... (not filtered out)
3343: if ($self->{HERE}->is_map() &&
3344: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3345: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3346: my $firstResource = $self->{HERE}->map_start();
3347: my $finishResource = $self->{HERE}->map_finish();
3348:
3349: $self->{RECURSIVE_ITERATOR} =
3350: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3351: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3352: $self->{CONDITION}, $self->{DIRECTION});
3353: }
3354:
3355: return $self->{HERE};
3356: }
3357:
3358: # Identical to the full iterator methods of the same name. Hate to copy/paste
3359: # but I also hate to "inherit" either iterator from the other.
3360:
3361: sub getStack {
3362: my $self=shift;
3363:
3364: my @stack;
3365:
3366: $self->populateStack(\@stack);
3367:
3368: return \@stack;
3369: }
3370:
3371: # Private method: Calls the iterators recursively to populate the stack.
3372: sub populateStack {
3373: my $self=shift;
3374: my $stack = shift;
3375:
3376: push @$stack, $self->{HERE} if ($self->{HERE});
3377:
3378: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3379: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3380: }
3381: }
3382:
3383: 1;
3384:
3385: package Apache::lonnavmaps::resource;
3386: use WeakRef;
3387: use Apache::lonnet;
3388:
3389: =pod
3390:
3391: =head1 Object: resource
3392:
3393: X<resource, navmap object>
3394: A resource object encapsulates a resource in a resource map, allowing
3395: easy manipulation of the resource, querying the properties of the
3396: resource (including user properties), and represents a reference that
3397: can be used as the canonical representation of the resource by
3398: lonnavmap clients like renderers.
3399:
3400: A resource only makes sense in the context of a navmap, as some of the
3401: data is stored in the navmap object.
3402:
3403: You will probably never need to instantiate this object directly. Use
3404: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3405: starting resource.
3406:
3407: Resource objects respect the parameter_hiddenparts, which suppresses
3408: various parts according to the wishes of the map author. As of this
3409: writing, there is no way to override this parameter, and suppressed
3410: parts will never be returned, nor will their response types or ids be
3411: stored.
3412:
3413: =head2 Overview
3414:
3415: A B<Resource> is the most granular type of object in LON-CAPA that can
3416: be included in a course. It can either be a particular resource, like
3417: an HTML page, external resource, problem, etc., or it can be a
3418: container sequence, such as a "page" or a "map".
3419:
3420: To see a sequence from the user's point of view, please see the
3421: B<Creating a Course: Maps and Sequences> chapter of the Author's
3422: Manual.
3423:
3424: A Resource Object, once obtained from a navmap object via a B<getBy*>
3425: method of the navmap, or from an iterator, allows you to query
3426: information about that resource.
3427:
3428: Generally, you do not ever want to create a resource object yourself,
3429: so creation has been left undocumented. Always retrieve resources
3430: from navmap objects.
3431:
3432: =head3 Identifying Resources
3433:
3434: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3435: unique to that resource for a given course. X<resource ID, in big hash>
3436: The Resource ID has the form #.#, where the first number is the same
3437: for every resource in a map, and the second is unique. For instance,
3438: for a course laid out like this:
3439:
3440: * Problem 1
3441: * Map
3442: * Resource 2
3443: * Resource 3
3444:
3445: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3446: C<Resource 3> will share a first number. The second number may end up
3447: re-used between the two groups.
3448:
3449: The resource ID is only used in the big hash, but can be used in the
3450: context of a course to identify a resource easily. (For instance, the
3451: printing system uses it to record which resources from a sequence you
3452: wish to print.)
3453:
3454: X<symb> X<resource, symb>
3455: All resources also have B<symb>s, which uniquely identify a resource
3456: in a course. Many internal LON-CAPA functions expect a symb. A symb
3457: carries along with it the URL of the resource, and the map it appears
3458: in. Symbs are much larger then resource IDs.
3459:
3460: =cut
3461:
3462: sub new {
3463: # magic invocation to create a class instance
3464: my $proto = shift;
3465: my $class = ref($proto) || $proto;
3466: my $self = {};
3467:
3468: weaken($self->{NAV_MAP} = shift);
3469: $self->{ID} = shift;
3470:
3471: # Store this new resource in the parent nav map's cache.
3472: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3473: $self->{RESOURCE_ERROR} = 0;
3474:
3475: # A hash that can be used by two-pass algorithms to store data
3476: # about this resource in. Not used by the resource object
3477: # directly.
3478: $self->{DATA} = {};
3479:
3480: bless($self);
3481:
3482: return $self;
3483: }
3484:
3485: # private function: simplify the NAV_HASH lookups we keep doing
3486: # pass the name, and to automatically append my ID, pass a true val on the
3487: # second param
3488: sub navHash {
3489: my $self = shift;
3490: my $param = shift;
3491: my $id = shift;
3492: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3493: }
3494:
3495: =pod
3496:
3497: =head2 Methods
3498:
3499: Once you have a resource object, here's what you can do with it:
3500:
3501: =head3 Attribute Retrieval
3502:
3503: Every resource has certain attributes that can be retrieved and used:
3504:
3505: =over 4
3506:
3507: =item * B<ID>: Every resource has an ID that is unique for that
3508: resource in the course it is in. The ID is actually in the hash
3509: representing the resource, so for a resource object $res, obtain
3510: it via C<$res->{ID}).
3511:
3512: =item * B<compTitle>:
3513:
3514: Returns a "composite title", that is equal to $res->title() if the
3515: resource has a title, and is otherwise the last part of the URL (e.g.,
3516: "problem.problem").
3517:
3518: =item * B<ext>:
3519:
3520: Returns true if the resource is external.
3521:
3522: =item * B<kind>:
3523:
3524: Returns the kind of the resource from the compiled nav map.
3525:
3526: =item * B<randomout>:
3527:
3528: Returns true if this resource was chosen to NOT be shown to the user
3529: by the random map selection feature. In other words, this is usually
3530: false.
3531:
3532: =item * B<randompick>:
3533:
3534: Returns true for a map if the randompick feature is being used on the
3535: map. (?)
3536:
3537: =item * B<src>:
3538:
3539: Returns the source for the resource.
3540:
3541: =item * B<symb>:
3542:
3543: Returns the symb for the resource.
3544:
3545: =item * B<title>:
3546:
3547: Returns the title of the resource.
3548:
3549: =back
3550:
3551: =cut
3552:
3553: # These info functions can be used directly, as they don't return
3554: # resource information.
3555: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3556: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3557: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3558: sub from { my $self=shift; return $self->navHash("from_", 1); }
3559: # considered private and undocumented
3560: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3561: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3562: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3563: sub randompick {
3564: my $self = shift;
3565: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3566: '.0.parameter_randompick'};
3567: }
3568: sub link {
3569: my $self=shift;
3570: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3571: return $self->src;
3572: }
3573: sub src {
3574: my $self=shift;
3575: return $self->navHash("src_", 1);
3576: }
3577: sub shown_symb {
3578: my $self=shift;
3579: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3580: return $self->symb();
3581: }
3582: sub id {
3583: my $self=shift;
3584: return $self->{ID};
3585: }
3586: sub enclosing_map_src {
3587: my $self=shift;
3588: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3589: return $self->navHash('map_id_'.$first);
3590: }
3591: sub symb {
3592: my $self=shift;
3593: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3594: my $symbSrc = &Apache::lonnet::declutter($self->src());
3595: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3596: . '___' . $second . '___' . $symbSrc;
3597: return &Apache::lonnet::symbclean($symb);
3598: }
3599: sub wrap_symb {
3600: my $self = shift;
3601: return $self->{NAV_MAP}->wrap_symb($self->symb());
3602: }
3603: sub title {
3604: my $self=shift;
3605: if ($self->{ID} eq '0.0') {
3606: # If this is the top-level map, return the title of the course
3607: # since this map can not be titled otherwise.
3608: return $env{'course.'.$env{'request.course.id'}.'.description'};
3609: }
3610: return $self->navHash("title_", 1); }
3611: # considered private and undocumented
3612: sub to { my $self=shift; return $self->navHash("to_", 1); }
3613: sub condition {
3614: my $self=shift;
3615: my $undercond=$self->navHash("undercond_", 1);
3616: if (!defined($undercond)) { return 1; };
3617: my $condid=$self->navHash("condid_$undercond");
3618: if (!defined($condid)) { return 1; };
3619: my $condition=&Apache::lonnet::directcondval($condid);
3620: return $condition;
3621: }
3622: sub condval {
3623: my $self=shift;
3624: my $uri=&Apache::lonnet::deversion(&Apache::lonnet::declutter($self->src()));
3625: my ($pathname,$filename)=($uri=~m|(.*)/([^/]*)|);
3626: $pathname=~s/^adm\/wrapper\///;
3627:
3628: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3629: /\&\Q$filename\E\:([\d\|]+)\&/);
3630: if ($match) {
3631: return &Apache::lonnet::condval($1);
3632: }
3633: return 0;
3634: }
3635: sub compTitle {
3636: my $self = shift;
3637: my $title = $self->title();
3638: $title=~s/\&colon\;/\:/gs;
3639: if (!$title) {
3640: $title = $self->src();
3641: $title = substr($title, rindex($title, '/') + 1);
3642: }
3643: return $title;
3644: }
3645: =pod
3646:
3647: B<Predicate Testing the Resource>
3648:
3649: These methods are shortcuts to deciding if a given resource has a given property.
3650:
3651: =over 4
3652:
3653: =item * B<is_map>:
3654:
3655: Returns true if the resource is a map type.
3656:
3657: =item * B<is_problem>:
3658:
3659: Returns true if the resource is a problem type, false
3660: otherwise. (Looks at the extension on the src field; might need more
3661: to work correctly.)
3662:
3663: =item * B<is_page>:
3664:
3665: Returns true if the resource is a page.
3666:
3667: =item * B<is_sequence>:
3668:
3669: Returns true if the resource is a sequence.
3670:
3671: =back
3672:
3673: =cut
3674:
3675: sub hasResource {
3676: my $self = shift;
3677: return $self->{NAV_MAP}->hasResource(@_);
3678: }
3679:
3680: sub retrieveResources {
3681: my $self = shift;
3682: return $self->{NAV_MAP}->retrieveResources(@_);
3683: }
3684:
3685: sub is_html {
3686: my $self=shift;
3687: my $src = $self->src();
3688: return ($src =~ /html$/);
3689: }
3690: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3691: sub is_page {
3692: my $self=shift;
3693: my $src = $self->src();
3694: return $self->navHash("is_map_", 1) &&
3695: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3696: }
3697: sub is_problem {
3698: my $self=shift;
3699: my $src = $self->src();
3700: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/)
3701: }
3702: sub contains_problem {
3703: my $self=shift;
3704: if ($self->is_page()) {
3705: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3706: return $hasProblem;
3707: }
3708: return 0;
3709: }
3710: sub is_sequence {
3711: my $self=shift;
3712: my $src = $self->src();
3713: return $self->navHash("is_map_", 1) &&
3714: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3715: }
3716: sub is_survey {
3717: my $self = shift();
3718: my $part = shift();
3719: if ($self->parmval('type',$part) eq 'survey') {
3720: return 1;
3721: }
3722: if ($self->src() =~ /\.(survey)$/) {
3723: return 1;
3724: }
3725: return 0;
3726: }
3727:
3728: sub is_empty_sequence {
3729: my $self=shift;
3730: my $src = $self->src();
3731: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3732: }
3733:
3734: # Private method: Shells out to the parmval in the nav map, handler parts.
3735: sub parmval {
3736: my $self = shift;
3737: my $what = shift;
3738: my $part = shift;
3739: if (!defined($part)) {
3740: $part = '0';
3741: }
3742: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3743: }
3744:
3745: =pod
3746:
3747: B<Map Methods>
3748:
3749: These methods are useful for getting information about the map
3750: properties of the resource, if the resource is a map (B<is_map>).
3751:
3752: =over 4
3753:
3754: =item * B<map_finish>:
3755:
3756: Returns a reference to a resource object corresponding to the finish
3757: resource of the map.
3758:
3759: =item * B<map_pc>:
3760:
3761: Returns the pc value of the map, which is the first number that
3762: appears in the resource ID of the resources in the map, and is the
3763: number that appears around the middle of the symbs of the resources in
3764: that map.
3765:
3766: =item * B<map_start>:
3767:
3768: Returns a reference to a resource object corresponding to the start
3769: resource of the map.
3770:
3771: =item * B<map_type>:
3772:
3773: Returns a string with the type of the map in it.
3774:
3775: =back
3776:
3777: =cut
3778:
3779: sub map_finish {
3780: my $self = shift;
3781: my $src = $self->src();
3782: $src = Apache::lonnet::clutter($src);
3783: my $res = $self->navHash("map_finish_$src", 0);
3784: $res = $self->{NAV_MAP}->getById($res);
3785: return $res;
3786: }
3787: sub map_pc {
3788: my $self = shift;
3789: my $src = $self->src();
3790: return $self->navHash("map_pc_$src", 0);
3791: }
3792: sub map_start {
3793: my $self = shift;
3794: my $src = $self->src();
3795: $src = Apache::lonnet::clutter($src);
3796: my $res = $self->navHash("map_start_$src", 0);
3797: $res = $self->{NAV_MAP}->getById($res);
3798: return $res;
3799: }
3800: sub map_type {
3801: my $self = shift;
3802: my $pc = $self->map_pc();
3803: return $self->navHash("map_type_$pc", 0);
3804: }
3805:
3806: #####
3807: # Property queries
3808: #####
3809:
3810: # These functions will be responsible for returning the CORRECT
3811: # VALUE for the parameter, no matter what. So while they may look
3812: # like direct calls to parmval, they can be more then that.
3813: # So, for instance, the duedate function should use the "duedatetype"
3814: # information, rather then the resource object user.
3815:
3816: =pod
3817:
3818: =head2 Resource Parameters
3819:
3820: In order to use the resource parameters correctly, the nav map must
3821: have been instantiated with genCourseAndUserOptions set to true, so
3822: the courseopt and useropt is read correctly. Then, you can call these
3823: functions to get the relevant parameters for the resource. Each
3824: function defaults to part "0", but can be directed to another part by
3825: passing the part as the parameter.
3826:
3827: These methods are responsible for getting the parameter correct, not
3828: merely reflecting the contents of the GDBM hashes. As we move towards
3829: dates relative to other dates, these methods should be updated to
3830: reflect that. (Then, anybody using these methods will not have to update
3831: their code.)
3832:
3833: =over 4
3834:
3835: =item * B<acc>:
3836:
3837: Get the Client IP/Name Access Control information.
3838:
3839: =item * B<answerdate>:
3840:
3841: Get the answer-reveal date for the problem.
3842:
3843: =item * B<awarded>:
3844:
3845: Gets the awarded value for the problem part. Requires genUserData set to
3846: true when the navmap object was created.
3847:
3848: =item * B<duedate>:
3849:
3850: Get the due date for the problem.
3851:
3852: =item * B<tries>:
3853:
3854: Get the number of tries the student has used on the problem.
3855:
3856: =item * B<maxtries>:
3857:
3858: Get the number of max tries allowed.
3859:
3860: =item * B<opendate>:
3861:
3862: Get the open date for the problem.
3863:
3864: =item * B<sig>:
3865:
3866: Get the significant figures setting.
3867:
3868: =item * B<tol>:
3869:
3870: Get the tolerance for the problem.
3871:
3872: =item * B<tries>:
3873:
3874: Get the number of tries the user has already used on the problem.
3875:
3876: =item * B<type>:
3877:
3878: Get the question type for the problem.
3879:
3880: =item * B<weight>:
3881:
3882: Get the weight for the problem.
3883:
3884: =back
3885:
3886: =cut
3887:
3888: sub acc {
3889: (my $self, my $part) = @_;
3890: return $self->parmval("acc", $part);
3891: }
3892: sub answerdate {
3893: (my $self, my $part) = @_;
3894: # Handle intervals
3895: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3896: return $self->duedate($part) +
3897: $self->parmval("answerdate", $part);
3898: }
3899: return $self->parmval("answerdate", $part);
3900: }
3901: sub awarded {
3902: my $self = shift; my $part = shift;
3903: $self->{NAV_MAP}->get_user_data();
3904: if (!defined($part)) { $part = '0'; }
3905: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3906: }
3907: sub duedate {
3908: (my $self, my $part) = @_;
3909: my $interval=$self->parmval("interval", $part);
3910: if ($interval) {
3911: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3912: if ($first_access) { return ($first_access+$interval); }
3913: }
3914: return $self->parmval("duedate", $part);
3915: }
3916: sub handgrade {
3917: (my $self, my $part) = @_;
3918: return $self->parmval("handgrade", $part);
3919: }
3920: sub maxtries {
3921: (my $self, my $part) = @_;
3922: return $self->parmval("maxtries", $part);
3923: }
3924: sub opendate {
3925: (my $self, my $part) = @_;
3926: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3927: return $self->duedate($part) -
3928: $self->parmval("opendate", $part);
3929: }
3930: return $self->parmval("opendate");
3931: }
3932: sub problemstatus {
3933: (my $self, my $part) = @_;
3934: return lc $self->parmval("problemstatus", $part);
3935: }
3936: sub sig {
3937: (my $self, my $part) = @_;
3938: return $self->parmval("sig", $part);
3939: }
3940: sub tol {
3941: (my $self, my $part) = @_;
3942: return $self->parmval("tol", $part);
3943: }
3944: sub tries {
3945: my $self = shift;
3946: my $tries = $self->queryRestoreHash('tries', shift);
3947: if (!defined($tries)) { return '0';}
3948: return $tries;
3949: }
3950: sub type {
3951: (my $self, my $part) = @_;
3952: return $self->parmval("type", $part);
3953: }
3954: sub weight {
3955: my $self = shift; my $part = shift;
3956: if (!defined($part)) { $part = '0'; }
3957: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3958: $self->symb(), $env{'user.domain'},
3959: $env{'user.name'},
3960: $env{'request.course.sec'});
3961: }
3962: sub part_display {
3963: my $self= shift(); my $partID = shift();
3964: if (! defined($partID)) { $partID = '0'; }
3965: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3966: $self->symb);
3967: if (! defined($display) || $display eq '') {
3968: $display = $partID;
3969: }
3970: return $display;
3971: }
3972:
3973: # Multiple things need this
3974: sub getReturnHash {
3975: my $self = shift;
3976:
3977: if (!defined($self->{RETURN_HASH})) {
3978: my %tmpHash = &Apache::lonnet::restore($self->symb());
3979: $self->{RETURN_HASH} = \%tmpHash;
3980: }
3981: }
3982:
3983: ######
3984: # Status queries
3985: ######
3986:
3987: # These methods query the status of problems.
3988:
3989: # If we need to count parts, this function determines the number of
3990: # parts from the metadata. When called, it returns a reference to a list
3991: # of strings corresponding to the parts. (Thus, using it in a scalar context
3992: # tells you how many parts you have in the problem:
3993: # $partcount = scalar($resource->countParts());
3994: # Don't use $self->{PARTS} directly because you don't know if it's been
3995: # computed yet.
3996:
3997: =pod
3998:
3999: =head2 Resource misc
4000:
4001: Misc. functions for the resource.
4002:
4003: =over 4
4004:
4005: =item * B<hasDiscussion>:
4006:
4007: Returns a false value if there has been discussion since the user last
4008: logged in, true if there has. Always returns false if the discussion
4009: data was not extracted when the nav map was constructed.
4010:
4011: =item * B<getFeedback>:
4012:
4013: Gets the feedback for the resource and returns the raw feedback string
4014: for the resource, or the null string if there is no feedback or the
4015: email data was not extracted when the nav map was constructed. Usually
4016: used like this:
4017:
4018: for (split(/\,/, $res->getFeedback())) {
4019: my $link = &Apache::lonnet::escape($_);
4020: ...
4021:
4022: and use the link as appropriate.
4023:
4024: =cut
4025:
4026: sub hasDiscussion {
4027: my $self = shift;
4028: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4029: }
4030:
4031: sub getFeedback {
4032: my $self = shift;
4033: my $source = $self->src();
4034: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4035: return $self->{NAV_MAP}->getFeedback($source);
4036: }
4037:
4038: sub getErrors {
4039: my $self = shift;
4040: my $source = $self->src();
4041: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4042: return $self->{NAV_MAP}->getErrors($source);
4043: }
4044:
4045: =pod
4046:
4047: =item * B<parts>():
4048:
4049: Returns a list reference containing sorted strings corresponding to
4050: each part of the problem. Single part problems have only a part '0'.
4051: Multipart problems do not return their part '0', since they typically
4052: do not really matter.
4053:
4054: =item * B<countParts>():
4055:
4056: Returns the number of parts of the problem a student can answer. Thus,
4057: for single part problems, returns 1. For multipart, it returns the
4058: number of parts in the problem, not including psuedo-part 0.
4059:
4060: =item * B<countResponses>():
4061:
4062: Returns the total number of responses in the problem a student can answer.
4063:
4064: =item * B<responseTypes>():
4065:
4066: Returns a hash whose keys are the response types. The values are the number
4067: of times each response type is used. This is for the I<entire> problem, not
4068: just a single part.
4069:
4070: =item * B<multipart>():
4071:
4072: Returns true if the problem is multipart, false otherwise. Use this instead
4073: of countParts if all you want is multipart/not multipart.
4074:
4075: =item * B<responseType>($part):
4076:
4077: Returns the response type of the part, without the word "response" on the
4078: end. Example return values: 'string', 'essay', 'numeric', etc.
4079:
4080: =item * B<responseIds>($part):
4081:
4082: Retreives the response IDs for the given part as an array reference containing
4083: strings naming the response IDs. This may be empty.
4084:
4085: =back
4086:
4087: =cut
4088:
4089: sub parts {
4090: my $self = shift;
4091:
4092: if ($self->ext) { return []; }
4093:
4094: $self->extractParts();
4095: return $self->{PARTS};
4096: }
4097:
4098: sub countParts {
4099: my $self = shift;
4100:
4101: my $parts = $self->parts();
4102:
4103: # If I left this here, then it's not necessary.
4104: #my $delta = 0;
4105: #for my $part (@$parts) {
4106: # if ($part eq '0') { $delta--; }
4107: #}
4108:
4109: if ($self->{RESOURCE_ERROR}) {
4110: return 0;
4111: }
4112:
4113: return scalar(@{$parts}); # + $delta;
4114: }
4115:
4116: sub countResponses {
4117: my $self = shift;
4118: my $count;
4119: foreach my $part (@{$self->parts()}) {
4120: $count+= scalar($self->responseIds($part));
4121: }
4122: return $count;
4123: }
4124:
4125: sub responseTypes {
4126: my $self = shift;
4127: my %responses;
4128: foreach my $part ($self->parts()) {
4129: foreach my $responsetype ($self->responseType($part)) {
4130: $responses{$responsetype}++ if (defined($responsetype));
4131: }
4132: }
4133: return %responses;
4134: }
4135:
4136: sub multipart {
4137: my $self = shift;
4138: return $self->countParts() > 1;
4139: }
4140:
4141: sub singlepart {
4142: my $self = shift;
4143: return $self->countParts() == 1;
4144: }
4145:
4146: sub responseType {
4147: my $self = shift;
4148: my $part = shift;
4149:
4150: $self->extractParts();
4151: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4152: return @{$self->{RESPONSE_TYPES}->{$part}};
4153: } else {
4154: return undef;
4155: }
4156: }
4157:
4158: sub responseIds {
4159: my $self = shift;
4160: my $part = shift;
4161:
4162: $self->extractParts();
4163: if (defined($self->{RESPONSE_IDS}->{$part})) {
4164: return @{$self->{RESPONSE_IDS}->{$part}};
4165: } else {
4166: return undef;
4167: }
4168: }
4169:
4170: # Private function: Extracts the parts information, both part names and
4171: # part types, and saves it.
4172: sub extractParts {
4173: my $self = shift;
4174:
4175: return if (defined($self->{PARTS}));
4176: return if ($self->ext);
4177:
4178: $self->{PARTS} = [];
4179:
4180: my %parts;
4181:
4182: # Retrieve part count, if this is a problem
4183: if ($self->is_problem()) {
4184: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4185: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4186:
4187: if ($partorder) {
4188: my @parts;
4189: for my $part (split (/,/,$partorder)) {
4190: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4191: push @parts, $part;
4192: $parts{$part} = 1;
4193: }
4194: }
4195: $self->{PARTS} = \@parts;
4196: } else {
4197: if (!$metadata) {
4198: $self->{RESOURCE_ERROR} = 1;
4199: $self->{PARTS} = [];
4200: $self->{PART_TYPE} = {};
4201: return;
4202: }
4203: foreach (split(/\,/,$metadata)) {
4204: if ($_ =~ /^(?:part|Task)_(.*)$/) {
4205: my $part = $1;
4206: # This floods the logs if it blows up
4207: if (defined($parts{$part})) {
4208: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4209: }
4210:
4211: # check to see if part is turned off.
4212:
4213: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4214: $parts{$part} = 1;
4215: }
4216: }
4217: }
4218: my @sortedParts = sort keys %parts;
4219: $self->{PARTS} = \@sortedParts;
4220: }
4221:
4222:
4223: # These hashes probably do not need names that end with "Hash"....
4224: my %responseIdHash;
4225: my %responseTypeHash;
4226:
4227:
4228: # Init the responseIdHash
4229: foreach (@{$self->{PARTS}}) {
4230: $responseIdHash{$_} = [];
4231: }
4232:
4233: # Now, the unfortunate thing about this is that parts, part name, and
4234: # response id are delimited by underscores, but both the part
4235: # name and response id can themselves have underscores in them.
4236: # So we have to use our knowlege of part names to figure out
4237: # where the part names begin and end, and even then, it is possible
4238: # to construct ambiguous situations.
4239: foreach (split /,/, $metadata) {
4240: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4241: my $responseType = $1;
4242: my $partStuff = $2;
4243: my $partIdSoFar = '';
4244: my @partChunks = split /_/, $partStuff;
4245: my $i = 0;
4246: for ($i = 0; $i < scalar(@partChunks); $i++) {
4247: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4248: $partIdSoFar .= $partChunks[$i];
4249: if ($parts{$partIdSoFar}) {
4250: my @otherChunks = @partChunks[$i+1..$#partChunks];
4251: my $responseId = join('_', @otherChunks);
4252: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4253: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4254: }
4255: }
4256: }
4257: }
4258: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4259: #
4260: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4261: if ($resorder) {
4262: my @resorder=split(/,/,$resorder);
4263: foreach my $part (keys(%responseIdHash)) {
4264: my $i=0;
4265: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4266: my @neworder;
4267: foreach my $possibleid (@resorder) {
4268: if (exists($resids{$possibleid})) {
4269: push(@neworder,$resids{$possibleid});
4270: }
4271: }
4272: my @ids;
4273: my @type;
4274: foreach my $element (@neworder) {
4275: push (@ids,$responseIdHash{$part}->[$element]);
4276: push (@type,$responseTypeHash{$part}->[$element]);
4277: }
4278: $responseIdHash{$part}=\@ids;
4279: $responseTypeHash{$part}=\@type;
4280: }
4281: }
4282: $self->{RESPONSE_IDS} = \%responseIdHash;
4283: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4284: }
4285:
4286: return;
4287: }
4288:
4289: =pod
4290:
4291: =head2 Resource Status
4292:
4293: Problem resources have status information, reflecting their various
4294: dates and completion statuses.
4295:
4296: There are two aspects to the status: the date-related information and
4297: the completion information.
4298:
4299: Idiomatic usage of these two methods would probably look something
4300: like
4301:
4302: foreach ($resource->parts()) {
4303: my $dateStatus = $resource->getDateStatus($_);
4304: my $completionStatus = $resource->getCompletionStatus($_);
4305:
4306: or
4307:
4308: my $status = $resource->status($_);
4309:
4310: ... use it here ...
4311: }
4312:
4313: Which you use depends on exactly what you are looking for. The
4314: status() function has been optimized for the nav maps display and may
4315: not precisely match what you need elsewhere.
4316:
4317: The symbolic constants shown below can be accessed through the
4318: resource object: C<$res->OPEN>.
4319:
4320: =over 4
4321:
4322: =item * B<getDateStatus>($part):
4323:
4324: ($part defaults to 0). A convenience function that returns a symbolic
4325: constant telling you about the date status of the part. The possible
4326: return values are:
4327:
4328: =back
4329:
4330: B<Date Codes>
4331:
4332: =over 4
4333:
4334: =item * B<OPEN_LATER>:
4335:
4336: The problem will be opened later.
4337:
4338: =item * B<OPEN>:
4339:
4340: Open and not yet due.
4341:
4342:
4343: =item * B<PAST_DUE_ANSWER_LATER>:
4344:
4345: The due date has passed, but the answer date has not yet arrived.
4346:
4347: =item * B<PAST_DUE_NO_ANSWER>:
4348:
4349: The due date has passed and there is no answer opening date set.
4350:
4351: =item * B<ANSWER_OPEN>:
4352:
4353: The answer date is here.
4354:
4355: =item * B<NETWORK_FAILURE>:
4356:
4357: The information is unknown due to network failure.
4358:
4359: =back
4360:
4361: =cut
4362:
4363: # Apparently the compiler optimizes these into constants automatically
4364: sub OPEN_LATER { return 0; }
4365: sub OPEN { return 1; }
4366: sub PAST_DUE_NO_ANSWER { return 2; }
4367: sub PAST_DUE_ANSWER_LATER { return 3; }
4368: sub ANSWER_OPEN { return 4; }
4369: sub NOTHING_SET { return 5; }
4370: sub NETWORK_FAILURE { return 100; }
4371:
4372: # getDateStatus gets the date status for a given problem part.
4373: # Because answer date, due date, and open date are fully independent
4374: # (i.e., it is perfectly possible to *only* have an answer date),
4375: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4376: # (past, future, none given). This function handles this with a decision
4377: # tree. Read the comments to follow the decision tree.
4378:
4379: sub getDateStatus {
4380: my $self = shift;
4381: my $part = shift;
4382: $part = "0" if (!defined($part));
4383:
4384: # Always return network failure if there was one.
4385: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4386:
4387: my $now = time();
4388:
4389: my $open = $self->opendate($part);
4390: my $due = $self->duedate($part);
4391: my $answer = $self->answerdate($part);
4392:
4393: if (!$open && !$due && !$answer) {
4394: # no data on the problem at all
4395: # should this be the same as "open later"? think multipart.
4396: return $self->NOTHING_SET;
4397: }
4398: if (!$open || $now < $open) {return $self->OPEN_LATER}
4399: if (!$due || $now < $due) {return $self->OPEN}
4400: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4401: if ($answer) { return $self->ANSWER_OPEN; }
4402: return PAST_DUE_NO_ANSWER;
4403: }
4404:
4405: =pod
4406:
4407: B<>
4408:
4409: =over 4
4410:
4411: =item * B<getCompletionStatus>($part):
4412:
4413: ($part defaults to 0.) A convenience function that returns a symbolic
4414: constant telling you about the completion status of the part, with the
4415: following possible results:
4416:
4417: =back
4418:
4419: B<Completion Codes>
4420:
4421: =over 4
4422:
4423: =item * B<NOT_ATTEMPTED>:
4424:
4425: Has not been attempted at all.
4426:
4427: =item * B<INCORRECT>:
4428:
4429: Attempted, but wrong by student.
4430:
4431: =item * B<INCORRECT_BY_OVERRIDE>:
4432:
4433: Attempted, but wrong by instructor override.
4434:
4435: =item * B<CORRECT>:
4436:
4437: Correct or correct by instructor.
4438:
4439: =item * B<CORRECT_BY_OVERRIDE>:
4440:
4441: Correct by instructor override.
4442:
4443: =item * B<EXCUSED>:
4444:
4445: Excused. Not yet implemented.
4446:
4447: =item * B<NETWORK_FAILURE>:
4448:
4449: Information not available due to network failure.
4450:
4451: =item * B<ATTEMPTED>:
4452:
4453: Attempted, and not yet graded.
4454:
4455: =back
4456:
4457: =cut
4458:
4459: sub NOT_ATTEMPTED { return 10; }
4460: sub INCORRECT { return 11; }
4461: sub INCORRECT_BY_OVERRIDE { return 12; }
4462: sub CORRECT { return 13; }
4463: sub CORRECT_BY_OVERRIDE { return 14; }
4464: sub EXCUSED { return 15; }
4465: sub ATTEMPTED { return 16; }
4466:
4467: sub getCompletionStatus {
4468: my $self = shift;
4469: my $part = shift;
4470: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4471:
4472: my $status = $self->queryRestoreHash('solved', $part);
4473:
4474: # Left as separate if statements in case we ever do more with this
4475: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4476: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4477: if ($status eq 'correct_by_override') {
4478: return $self->CORRECT_BY_OVERRIDE;
4479: }
4480: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4481: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4482: if ($status eq 'excused') {return $self->EXCUSED; }
4483: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4484: return $self->NOT_ATTEMPTED;
4485: }
4486:
4487: sub queryRestoreHash {
4488: my $self = shift;
4489: my $hashentry = shift;
4490: my $part = shift;
4491: $part = "0" if (!defined($part) || $part eq '');
4492: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4493:
4494: $self->getReturnHash();
4495:
4496: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4497: }
4498:
4499: =pod
4500:
4501: B<Composite Status>
4502:
4503: Along with directly returning the date or completion status, the
4504: resource object includes a convenience function B<status>() that will
4505: combine the two status tidbits into one composite status that can
4506: represent the status of the resource as a whole. This method represents
4507: the concept of the thing we want to display to the user on the nav maps
4508: screen, which is a combination of completion and open status. The precise logic is
4509: documented in the comments of the status method. The following results
4510: may be returned, all available as methods on the resource object
4511: ($res->NETWORK_FAILURE): In addition to the return values that match
4512: the date or completion status, this function can return "ANSWER_SUBMITTED"
4513: if that problemstatus parameter value is set to No, suppressing the
4514: incorrect/correct feedback.
4515:
4516: =over 4
4517:
4518: =item * B<NETWORK_FAILURE>:
4519:
4520: The network has failed and the information is not available.
4521:
4522: =item * B<NOTHING_SET>:
4523:
4524: No dates have been set for this problem (part) at all. (Because only
4525: certain parts of a multi-part problem may be assigned, this can not be
4526: collapsed into "open later", as we do not know a given part will EVER
4527: be opened. For single part, this is the same as "OPEN_LATER".)
4528:
4529: =item * B<CORRECT>:
4530:
4531: For any reason at all, the part is considered correct.
4532:
4533: =item * B<EXCUSED>:
4534:
4535: For any reason at all, the problem is excused.
4536:
4537: =item * B<PAST_DUE_NO_ANSWER>:
4538:
4539: The problem is past due, not considered correct, and no answer date is
4540: set.
4541:
4542: =item * B<PAST_DUE_ANSWER_LATER>:
4543:
4544: The problem is past due, not considered correct, and an answer date in
4545: the future is set.
4546:
4547: =item * B<ANSWER_OPEN>:
4548:
4549: The problem is past due, not correct, and the answer is now available.
4550:
4551: =item * B<OPEN_LATER>:
4552:
4553: The problem is not yet open.
4554:
4555: =item * B<TRIES_LEFT>:
4556:
4557: The problem is open, has been tried, is not correct, but there are
4558: tries left.
4559:
4560: =item * B<INCORRECT>:
4561:
4562: The problem is open, and all tries have been used without getting the
4563: correct answer.
4564:
4565: =item * B<OPEN>:
4566:
4567: The item is open and not yet tried.
4568:
4569: =item * B<ATTEMPTED>:
4570:
4571: The problem has been attempted.
4572:
4573: =item * B<ANSWER_SUBMITTED>:
4574:
4575: An answer has been submitted, but the student should not see it.
4576:
4577: =back
4578:
4579: =cut
4580:
4581: sub TRIES_LEFT { return 20; }
4582: sub ANSWER_SUBMITTED { return 21; }
4583: sub PARTIALLY_CORRECT{ return 22; }
4584:
4585: sub status {
4586: my $self = shift;
4587: my $part = shift;
4588: if (!defined($part)) { $part = "0"; }
4589: my $completionStatus = $self->getCompletionStatus($part);
4590: my $dateStatus = $self->getDateStatus($part);
4591:
4592: # What we have is a two-dimensional matrix with 4 entries on one
4593: # dimension and 5 entries on the other, which we want to colorize,
4594: # plus network failure and "no date data at all".
4595:
4596: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4597: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4598:
4599: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4600: # If there's an answer date and we're past it, don't
4601: # suppress the feedback; student should know
4602: if ($self->duedate($part) && $self->duedate($part) < time() &&
4603: $self->answerdate($part) && $self->answerdate($part) < time()) {
4604: $suppressFeedback = 0;
4605: }
4606:
4607: # There are a few whole rows we can dispose of:
4608: if ($completionStatus == CORRECT ||
4609: $completionStatus == CORRECT_BY_OVERRIDE ) {
4610: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4611: my $awarded=$self->awarded($part);
4612: if ($awarded < 1 && $awarded > 0) {
4613: return PARTIALLY_CORRECT;
4614: } elsif ($awarded<1) {
4615: return INCORRECT;
4616: }
4617: return CORRECT;
4618: }
4619:
4620: # If it's WRONG... and not open
4621: if ( ($completionStatus == INCORRECT ||
4622: $completionStatus == INCORRECT_BY_OVERRIDE)
4623: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
4624: return INCORRECT;
4625: }
4626:
4627: if ($completionStatus == ATTEMPTED) {
4628: return ATTEMPTED;
4629: }
4630:
4631: # If it's EXCUSED, then return that no matter what
4632: if ($completionStatus == EXCUSED) {
4633: return EXCUSED;
4634: }
4635:
4636: if ($dateStatus == NOTHING_SET) {
4637: return NOTHING_SET;
4638: }
4639:
4640: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4641: # by 4 matrix (date statuses).
4642:
4643: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4644: $dateStatus == PAST_DUE_NO_ANSWER ) {
4645: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4646: }
4647:
4648: if ($dateStatus == ANSWER_OPEN) {
4649: return ANSWER_OPEN;
4650: }
4651:
4652: # Now: (incorrect, incorrect_override, not_attempted) x
4653: # (open_later), (open)
4654:
4655: if ($dateStatus == OPEN_LATER) {
4656: return OPEN_LATER;
4657: }
4658:
4659: # If it's WRONG...
4660: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4661: # and there are TRIES LEFT:
4662: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4663: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4664: }
4665: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4666: }
4667:
4668: # Otherwise, it's untried and open
4669: return OPEN;
4670: }
4671:
4672: sub CLOSED { return 23; }
4673: sub ERROR { return 24; }
4674:
4675: =pod
4676:
4677: B<Simple Status>
4678:
4679: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4680: "Simple status" corresponds to "which icon is shown on the
4681: Navmaps". There are six "simple" statuses:
4682:
4683: =over 4
4684:
4685: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4686:
4687: =item * B<OPEN>: The problem is open and unattempted.
4688:
4689: =item * B<CORRECT>: The problem is correct for any reason.
4690:
4691: =item * B<INCORRECT>: The problem is incorrect and can still be
4692: completed successfully.
4693:
4694: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4695: does not know if they are correct. (The ellipsis icon.)
4696:
4697: =item * B<ERROR>: There is an error retrieving information about this
4698: problem.
4699:
4700: =back
4701:
4702: =cut
4703:
4704: # This hash maps the composite status to this simple status, and
4705: # can be used directly, if you like
4706: my %compositeToSimple =
4707: (
4708: NETWORK_FAILURE() => ERROR,
4709: NOTHING_SET() => CLOSED,
4710: CORRECT() => CORRECT,
4711: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4712: EXCUSED() => CORRECT,
4713: PAST_DUE_NO_ANSWER() => INCORRECT,
4714: PAST_DUE_ANSWER_LATER() => INCORRECT,
4715: ANSWER_OPEN() => INCORRECT,
4716: OPEN_LATER() => CLOSED,
4717: TRIES_LEFT() => OPEN,
4718: INCORRECT() => INCORRECT,
4719: OPEN() => OPEN,
4720: ATTEMPTED() => ATTEMPTED,
4721: ANSWER_SUBMITTED() => ATTEMPTED
4722: );
4723:
4724: sub simpleStatus {
4725: my $self = shift;
4726: my $part = shift;
4727: my $status = $self->status($part);
4728: return $compositeToSimple{$status};
4729: }
4730:
4731: =pod
4732:
4733: B<simpleStatusCount> will return an array reference containing, in
4734: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4735: and ERROR parts the given problem has.
4736:
4737: =cut
4738:
4739: # This maps the status to the slot we want to increment
4740: my %statusToSlotMap =
4741: (
4742: OPEN() => 0,
4743: CLOSED() => 1,
4744: CORRECT() => 2,
4745: INCORRECT() => 3,
4746: ATTEMPTED() => 4,
4747: ERROR() => 5
4748: );
4749:
4750: sub statusToSlot { return $statusToSlotMap{shift()}; }
4751:
4752: sub simpleStatusCount {
4753: my $self = shift;
4754:
4755: my @counts = (0, 0, 0, 0, 0, 0, 0);
4756: foreach my $part (@{$self->parts()}) {
4757: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4758: }
4759:
4760: return \@counts;
4761: }
4762:
4763: =pod
4764:
4765: B<Completable>
4766:
4767: The completable method represents the concept of I<whether the student can
4768: currently do the problem>. If the student can do the problem, which means
4769: that it is open, there are tries left, and if the problem is manually graded
4770: or the grade is suppressed via problemstatus, the student has not tried it
4771: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4772: either the student has tried it and there is no feedback, or that for
4773: some reason it is no longer completable (not open yet, successfully completed,
4774: out of tries, etc.). As an example, this is used as the filter for the
4775: "Uncompleted Homework" option for the nav maps.
4776:
4777: If this does not quite meet your needs, do not fiddle with it (unless you are
4778: fixing it to better match the student's conception of "completable" because
4779: it's broken somehow)... make a new method.
4780:
4781: =cut
4782:
4783: sub completable {
4784: my $self = shift;
4785: if (!$self->is_problem()) { return 0; }
4786: my $partCount = $self->countParts();
4787:
4788: foreach my $part (@{$self->parts()}) {
4789: if ($part eq '0' && $partCount != 1) { next; }
4790: my $status = $self->status($part);
4791: # "If any of the parts are open, or have tries left (implies open),
4792: # and it is not "attempted" (manually graded problem), it is
4793: # not "complete"
4794: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4795: $status == ANSWER_SUBMITTED() ) {
4796: # did this part already, as well as we can
4797: next;
4798: }
4799: if ($status == OPEN() || $status == TRIES_LEFT()) {
4800: return 1;
4801: }
4802: }
4803:
4804: # If all the parts were complete, so was this problem.
4805: return 0;
4806: }
4807:
4808: =pod
4809:
4810: =head2 Resource/Nav Map Navigation
4811:
4812: =over 4
4813:
4814: =item * B<getNext>():
4815:
4816: Retreive an array of the possible next resources after this
4817: one. Always returns an array, even in the one- or zero-element case.
4818:
4819: =item * B<getPrevious>():
4820:
4821: Retreive an array of the possible previous resources from this
4822: one. Always returns an array, even in the one- or zero-element case.
4823:
4824: =cut
4825:
4826: sub getNext {
4827: my $self = shift;
4828: my @branches;
4829: my $to = $self->to();
4830: foreach my $branch ( split(/,/, $to) ) {
4831: my $choice = $self->{NAV_MAP}->getById($branch);
4832: #if (!$choice->condition()) { next; }
4833: my $next = $choice->goesto();
4834: $next = $self->{NAV_MAP}->getById($next);
4835:
4836: push @branches, $next;
4837: }
4838: return \@branches;
4839: }
4840:
4841: sub getPrevious {
4842: my $self = shift;
4843: my @branches;
4844: my $from = $self->from();
4845: foreach my $branch ( split /,/, $from) {
4846: my $choice = $self->{NAV_MAP}->getById($branch);
4847: my $prev = $choice->comesfrom();
4848: $prev = $self->{NAV_MAP}->getById($prev);
4849:
4850: push @branches, $prev;
4851: }
4852: return \@branches;
4853: }
4854:
4855: sub browsePriv {
4856: my $self = shift;
4857: if (defined($self->{BROWSE_PRIV})) {
4858: return $self->{BROWSE_PRIV};
4859: }
4860:
4861: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4862: $self->symb());
4863: }
4864:
4865: =pod
4866:
4867: =back
4868:
4869: =cut
4870:
4871: 1;
4872:
4873: __END__
4874:
4875:
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