1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.349.2.5 2005/12/29 18:50:35 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.partial.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: && $res->handgrade($part) ne 'yes') {
535: return &mt("Answer available");
536: }
537: if ($status == $res->EXCUSED) {
538: return &mt("Excused by instructor");
539: }
540: if ($status == $res->ATTEMPTED) {
541: return &mt("Answer submitted, not yet graded");
542: }
543: if ($status == $res->TRIES_LEFT) {
544: my $tries = $res->tries($part);
545: my $maxtries = $res->maxtries($part);
546: my $triesString = "";
547: if ($tries && $maxtries) {
548: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
549: if ($maxtries > 1 && $maxtries - $tries == 1) {
550: $triesString = "<b>$triesString</b>";
551: }
552: }
553: if ($res->duedate($part)) {
554: return &mt("Due")." " . timeToHumanString($res->duedate($part),'end') .
555: " $triesString";
556: } else {
557: return &mt("No due date")." $triesString";
558: }
559: }
560: if ($status == $res->ANSWER_SUBMITTED) {
561: return &mt('Answer submitted');
562: }
563: }
564:
565: # Convenience function, so others can use it: Is the problem due in less then
566: # 24 hours, and still can be done?
567:
568: sub dueInLessThan24Hours {
569: my $res = shift;
570: my $part = shift;
571: my $status = $res->status($part);
572:
573: return ($status == $res->OPEN() ||
574: $status == $res->TRIES_LEFT()) &&
575: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
576: $res->duedate($part) > time();
577: }
578:
579: # Convenience function, so others can use it: Is there only one try remaining for the
580: # part, with more then one try to begin with, not due yet and still can be done?
581: sub lastTry {
582: my $res = shift;
583: my $part = shift;
584:
585: my $tries = $res->tries($part);
586: my $maxtries = $res->maxtries($part);
587: return $tries && $maxtries && $maxtries > 1 &&
588: $maxtries - $tries == 1 && $res->duedate($part) &&
589: $res->duedate($part) > time();
590: }
591:
592: # This puts a human-readable name on the env variable.
593:
594: sub advancedUser {
595: return $env{'request.role.adv'};
596: }
597:
598:
599: # timeToHumanString takes a time number and converts it to a
600: # human-readable representation, meant to be used in the following
601: # manner:
602: # print "Due $timestring"
603: # print "Open $timestring"
604: # print "Answer available $timestring"
605: # Very, very, very, VERY English-only... goodness help a localizer on
606: # this func...
607:
608:
609: sub timeToHumanString {
610: my ($time,$type,$format) = @_;
611:
612: # zero, '0' and blank are bad times
613: if (!$time) {
614: return &mt('never');
615: }
616: unless (&Apache::lonlocal::current_language()=~/^en/) {
617: return &Apache::lonlocal::locallocaltime($time);
618: }
619: my $now = time();
620:
621: my @time = localtime($time);
622: my @now = localtime($now);
623:
624: # Positive = future
625: my $delta = $time - $now;
626:
627: my $minute = 60;
628: my $hour = 60 * $minute;
629: my $day = 24 * $hour;
630: my $week = 7 * $day;
631: my $inPast = 0;
632:
633: # Logic in comments:
634: # Is it now? (extremely unlikely)
635: if ( $delta == 0 ) {
636: return "this instant";
637: }
638:
639: if ($delta < 0) {
640: $inPast = 1;
641: $delta = -$delta;
642: }
643:
644: if ( $delta > 0 ) {
645:
646: my $tense = $inPast ? " ago" : "";
647: my $prefix = $inPast ? "" : "in ";
648:
649: # Less then a minute
650: if ( $delta < $minute ) {
651: if ($delta == 1) { return "${prefix}1 second$tense"; }
652: return "$prefix$delta seconds$tense";
653: }
654:
655: # Less then an hour
656: if ( $delta < $hour ) {
657: # If so, use minutes
658: my $minutes = floor($delta / 60);
659: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
660: return "$prefix$minutes minutes$tense";
661: }
662:
663: # Is it less then 24 hours away? If so,
664: # display hours + minutes
665: if ( $delta < $hour * 24) {
666: my $hours = floor($delta / $hour);
667: my $minutes = floor(($delta % $hour) / $minute);
668: my $hourString = "$hours hours";
669: my $minuteString = ", $minutes minutes";
670: if ($hours == 1) {
671: $hourString = "1 hour";
672: }
673: if ($minutes == 1) {
674: $minuteString = ", 1 minute";
675: }
676: if ($minutes == 0) {
677: $minuteString = "";
678: }
679: return "$prefix$hourString$minuteString$tense";
680: }
681:
682: # If there's a caller supplied format, use it.
683:
684: if($format ne '') {
685: my $timeStr = strftime($format, localtime($time));
686: return $timeStr.&Apache::lonlocal::gettimezone();
687: }
688:
689: # Less then 5 days away, display day of the week and
690: # HH:MM
691:
692: if ( $delta < $day * 5 ) {
693: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
694: $timeStr =~ s/12:00 am/00:00/;
695: $timeStr =~ s/12:00 pm/noon/;
696: return ($inPast ? "last " : "this ") .
697: $timeStr.&Apache::lonlocal::gettimezone();
698: }
699:
700: my $conjunction='on';
701: if ($type eq 'start') {
702: $conjunction='at';
703: } elsif ($type eq 'end') {
704: $conjunction='by';
705: }
706: # Is it this year?
707: if ( $time[5] == $now[5]) {
708: # Return on Month Day, HH:MM meridian
709: my $timeStr = strftime("$conjunction %A, %b %e at %I:%M %P", localtime($time));
710: $timeStr =~ s/12:00 am/00:00/;
711: $timeStr =~ s/12:00 pm/noon/;
712: return $timeStr.&Apache::lonlocal::gettimezone();
713: }
714:
715: # Not this year, so show the year
716: my $timeStr = strftime("$conjunction %A, %b %e %Y at %I:%M %P", localtime($time));
717: $timeStr =~ s/12:00 am/00:00/;
718: $timeStr =~ s/12:00 pm/noon/;
719: return $timeStr.&Apache::lonlocal::gettimezone();
720: }
721: }
722:
723:
724: =pod
725:
726: =head1 NAME
727:
728: Apache::lonnavmap - Subroutines to handle and render the navigation
729: maps
730:
731: =head1 SYNOPSIS
732:
733: The main handler generates the navigational listing for the course,
734: the other objects export this information in a usable fashion for
735: other modules.
736:
737: =head1 OVERVIEW
738:
739: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
740: course structure and caches it in what is often referred to as the
741: "big hash" X<big hash>. You can see it if you are logged into
742: LON-CAPA, in a course, by going to /adm/test. (You may need to
743: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
744: content of the hash will be under the heading "Big Hash".
745:
746: Big Hash contains, among other things, how resources are related
747: to each other (next/previous), what resources are maps, which
748: resources are being chosen to not show to the student (for random
749: selection), and a lot of other things that can take a lot of time
750: to compute due to the amount of data that needs to be collected and
751: processed.
752:
753: Apache::lonnavmaps provides an object model for manipulating this
754: information in a higher-level fashion then directly manipulating
755: the hash. It also provides access to several auxilary functions
756: that aren't necessarily stored in the Big Hash, but are a per-
757: resource sort of value, like whether there is any feedback on
758: a given resource.
759:
760: Apache::lonnavmaps also abstracts away branching, and someday,
761: conditions, for the times where you don't really care about those
762: things.
763:
764: Apache::lonnavmaps also provides fairly powerful routines for
765: rendering navmaps, and last but not least, provides the navmaps
766: view for when the user clicks the NAV button.
767:
768: B<Note>: Apache::lonnavmaps I<only> works for the "currently
769: logged in user"; if you want things like "due dates for another
770: student" lonnavmaps can not directly retrieve information like
771: that. You need the EXT function. This module can still help,
772: because many things, such as the course structure, are constant
773: between users, and Apache::lonnavmaps can help by providing
774: symbs for the EXT call.
775:
776: The rest of this file will cover the provided rendering routines,
777: which can often be used without fiddling with the navmap object at
778: all, then documents the Apache::lonnavmaps::navmap object, which
779: is the key to accessing the Big Hash information, covers the use
780: of the Iterator (which provides the logic for traversing the
781: somewhat-complicated Big Hash data structure), documents the
782: Apache::lonnavmaps::Resource objects that are returned by
783:
784: =head1 Subroutine: render
785:
786: The navmap renderer package provides a sophisticated rendering of the
787: standard navigation maps interface into HTML. The provided nav map
788: handler is actually just a glorified call to this.
789:
790: Because of the large number of parameters this function accepts,
791: instead of passing it arguments as is normal, pass it in an anonymous
792: hash with the desired options.
793:
794: The package provides a function called 'render', called as
795: Apache::lonnavmaps::render({}).
796:
797: =head2 Overview of Columns
798:
799: The renderer will build an HTML table for the navmap and return
800: it. The table is consists of several columns, and a row for each
801: resource (or possibly each part). You tell the renderer how many
802: columns to create and what to place in each column, optionally using
803: one or more of the prepared columns, and the renderer will assemble
804: the table.
805:
806: Any additional generally useful column types should be placed in the
807: renderer code here, so anybody can use it anywhere else. Any code
808: specific to the current application (such as the addition of <input>
809: elements in a column) should be placed in the code of the thing using
810: the renderer.
811:
812: At the core of the renderer is the array reference COLS (see Example
813: section below for how to pass this correctly). The COLS array will
814: consist of entries of one of two types of things: Either an integer
815: representing one of the pre-packaged column types, or a sub reference
816: that takes a resource reference, a part number, and a reference to the
817: argument hash passed to the renderer, and returns a string that will
818: be inserted into the HTML representation as it.
819:
820: All other parameters are ways of either changing how the columns
821: are printing, or which rows are shown.
822:
823: The pre-packaged column names are refered to by constants in the
824: Apache::lonnavmaps namespace. The following currently exist:
825:
826: =over 4
827:
828: =item * B<Apache::lonnavmaps::resource>:
829:
830: The general info about the resource: Link, icon for the type, etc. The
831: first column in the standard nav map display. This column provides the
832: indentation effect seen in the B<NAV> screen. This column also accepts
833: the following parameters in the renderer hash:
834:
835: =over 4
836:
837: =item * B<resource_nolink>: default false
838:
839: If true, the resource will not be linked. By default, all non-folder
840: resources are linked.
841:
842: =item * B<resource_part_count>: default true
843:
844: If true, the resource will show a part count B<if> the full
845: part list is not displayed. (See "condense_parts" later.) If false,
846: the resource will never show a part count.
847:
848: =item * B<resource_no_folder_link>:
849:
850: If true, the resource's folder will not be clickable to open or close
851: it. Default is false. True implies printCloseAll is false, since you
852: can't close or open folders when this is on anyhow.
853:
854: =back
855:
856: =item * B<Apache::lonnavmaps::communication_status>:
857:
858: Whether there is discussion on the resource, email for the user, or
859: (lumped in here) perl errors in the execution of the problem. This is
860: the second column in the main nav map.
861:
862: =item * B<Apache::lonnavmaps::quick_status>:
863:
864: An icon for the status of a problem, with five possible states:
865: Correct, incorrect, open, awaiting grading (for a problem where the
866: computer's grade is suppressed, or the computer can't grade, like
867: essay problem), or none (not open yet, not a problem). The
868: third column of the standard navmap.
869:
870: =item * B<Apache::lonnavmaps::long_status>:
871:
872: A text readout of the details of the current status of the problem,
873: such as "Due in 22 hours". The fourth column of the standard navmap.
874:
875: =item * B<Apache::lonnavmaps::part_status_summary>:
876:
877: A text readout summarizing the status of the problem. If it is a
878: single part problem, will display "Correct", "Incorrect",
879: "Not yet open", "Open", "Attempted", or "Error". If there are
880: multiple parts, this will output a string that in HTML will show a
881: status of how many parts are in each status, in color coding, trying
882: to match the colors of the icons within reason.
883:
884: Note this only makes sense if you are I<not> showing parts. If
885: C<showParts> is true (see below), this column will not output
886: anything.
887:
888: =back
889:
890: If you add any others please be sure to document them here.
891:
892: An example of a column renderer that will show the ID number of a
893: resource, along with the part name if any:
894:
895: sub {
896: my ($resource, $part, $params) = @_;
897: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
898: return '<td>' . $resource->{ID} . '</td>';
899: }
900:
901: Note these functions are responsible for the TD tags, which allow them
902: to override vertical and horizontal alignment, etc.
903:
904: =head2 Parameters
905:
906: Minimally, you should be
907: able to get away with just using 'cols' (to specify the columns
908: shown), 'url' (necessary for the folders to link to the current screen
909: correctly), and possibly 'queryString' if your app calls for it. In
910: that case, maintaining the state of the folders will be done
911: automatically.
912:
913: =over 4
914:
915: =item * B<iterator>: default: constructs one from %env
916:
917: A reference to a fresh ::iterator to use from the navmaps. The
918: rendering will reflect the options passed to the iterator, so you can
919: use that to just render a certain part of the course, if you like. If
920: one is not passed, the renderer will attempt to construct one from
921: env{'form.filter'} and env{'form.condition'} information, plus the
922: 'iterator_map' parameter if any.
923:
924: =item * B<iterator_map>: default: not used
925:
926: If you are letting the renderer do the iterator handling, you can
927: instruct the renderer to render only a particular map by passing it
928: the source of the map you want to process, like
929: '/res/103/jerf/navmap.course.sequence'.
930:
931: =item * B<navmap>: default: constructs one from %env
932:
933: A reference to a navmap, used only if an iterator is not passed in. If
934: this is necessary to make an iterator but it is not passed in, a new
935: one will be constructed based on env info. This is useful to do basic
936: error checking before passing it off to render.
937:
938: =item * B<r>: default: must be passed in
939:
940: The standard Apache response object. This must be passed to the
941: renderer or the course hash will be locked.
942:
943: =item * B<cols>: default: empty (useless)
944:
945: An array reference
946:
947: =item * B<showParts>:default true
948:
949: A flag. If true, a line for the resource itself, and a line
950: for each part will be displayed. If not, only one line for each
951: resource will be displayed.
952:
953: =item * B<condenseParts>: default true
954:
955: A flag. If true, if all parts of the problem have the same
956: status and that status is Nothing Set, Correct, or Network Failure,
957: then only one line will be displayed for that resource anyhow. If no,
958: all parts will always be displayed. If showParts is 0, this is
959: ignored.
960:
961: =item * B<jumpCount>: default: determined from %env
962:
963: A string identifying the URL to place the anchor 'curloc' at.
964: It is the responsibility of the renderer user to
965: ensure that the #curloc is in the URL. By default, determined through
966: the use of the env{} 'jump' information, and should normally "just
967: work" correctly.
968:
969: =item * B<here>: default: empty string
970:
971: A Symb identifying where to place the 'here' marker. The empty
972: string means no marker.
973:
974: =item * B<indentString>: default: 25 pixel whitespace image
975:
976: A string identifying the indentation string to use.
977:
978: =item * B<queryString>: default: empty
979:
980: A string which will be prepended to the query string used when the
981: folders are opened or closed. You can use this to pass
982: application-specific values.
983:
984: =item * B<url>: default: none
985:
986: The url the folders will link to, which should be the current
987: page. Required if the resource info column is shown, and you
988: are allowing the user to open and close folders.
989:
990: =item * B<currentJumpIndex>: default: no jumping
991:
992: Describes the currently-open row number to cause the browser to jump
993: to, because the user just opened that folder. By default, pulled from
994: the Jump information in the env{'form.*'}.
995:
996: =item * B<printKey>: default: false
997:
998: If true, print the key that appears on the top of the standard
999: navmaps.
1000:
1001: =item * B<printCloseAll>: default: true
1002:
1003: If true, print the "Close all folders" or "open all folders"
1004: links.
1005:
1006: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1007:
1008: A function that takes the resource object as its only parameter and
1009: returns a true or false value. If true, the resource is displayed. If
1010: false, it is simply skipped in the display.
1011:
1012: =item * B<suppressEmptySequences>: default: false
1013:
1014: If you're using a filter function, and displaying sequences to orient
1015: the user, then frequently some sequences will be empty. Setting this to
1016: true will cause those sequences not to display, so as not to confuse the
1017: user into thinking that if the sequence is there there should be things
1018: under it; for example, see the "Show Uncompleted Homework" view on the
1019: B<NAV> screen.
1020:
1021: =item * B<suppressNavmaps>: default: false
1022:
1023: If true, will not display Navigate Content resources.
1024:
1025: =back
1026:
1027: =head2 Additional Info
1028:
1029: In addition to the parameters you can pass to the renderer, which will
1030: be passed through unchange to the column renderers, the renderer will
1031: generate the following information which your renderer may find
1032: useful:
1033:
1034: =over 4
1035:
1036: =item * B<counter>:
1037:
1038: Contains the number of rows printed. Useful after calling the render
1039: function, as you can detect whether anything was printed at all.
1040:
1041: =item * B<isNewBranch>:
1042:
1043: Useful for renderers: If this resource is currently the first resource
1044: of a new branch, this will be true. The Resource column (leftmost in the
1045: navmaps screen) uses this to display the "new branch" icon
1046:
1047: =back
1048:
1049: =cut
1050:
1051: sub resource { return 0; }
1052: sub communication_status { return 1; }
1053: sub quick_status { return 2; }
1054: sub long_status { return 3; }
1055: sub part_status_summary { return 4; }
1056:
1057: sub render_resource {
1058: my ($resource, $part, $params) = @_;
1059:
1060: my $nonLinkedText = ''; # stuff after resource title not in link
1061:
1062: my $link = $params->{"resourceLink"};
1063:
1064: # The URL part is not escaped at this point, but the symb is...
1065: # The stuff to the left of the ? must have ' replaced by \' since
1066: # it will be quoted with ' in the href.
1067:
1068: my ($left,$right) = split(/\?/, $link);
1069: $link = $left.'?'.$right;
1070:
1071: my $src = $resource->src();
1072: my $it = $params->{"iterator"};
1073: my $filter = $it->{FILTER};
1074:
1075: my $title = $resource->compTitle();
1076:
1077: my $partLabel = "";
1078: my $newBranchText = "";
1079: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1080: # If this is a new branch, label it so
1081: if ($params->{'isNewBranch'}) {
1082: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
1083: }
1084:
1085: # links to open and close the folder
1086:
1087:
1088: my $linkopen = "<a href=\"$link\">";
1089:
1090:
1091: my $linkclose = "</a>";
1092:
1093: # Default icon: unknown page
1094: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
1095:
1096: if ($resource->is_problem()) {
1097: if ($part eq '0' || $params->{'condensed'}) {
1098: $icon ='<img src="'.$location.'/problem.gif" alt=" " border="0" />';
1099: } else {
1100: $icon = $params->{'indentString'};
1101: }
1102: } else {
1103: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
1104: }
1105:
1106: # Display the correct map icon to open or shut map
1107: if ($resource->is_map()) {
1108: my $mapId = $resource->map_pc();
1109: my $nowOpen = !defined($filter->{$mapId});
1110: if ($it->{CONDITION}) {
1111: $nowOpen = !$nowOpen;
1112: }
1113:
1114: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1115:
1116: if (!$params->{'resource_no_folder_link'}) {
1117: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1118: $icon = "<img src='$location/$icon' alt='".
1119: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1120:
1121: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
1122: $params->{'queryString'} . '&filter=';
1123: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1124: addToFilter($filter, $mapId) :
1125: removeFromFilter($filter, $mapId);
1126: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1127: . $params->{'hereType'} . '&here=' .
1128: &Apache::lonnet::escape($params->{'here'}) .
1129: '&jump=' .
1130: &Apache::lonnet::escape($resource->symb()) .
1131: "&folderManip=1\">";
1132:
1133: } else {
1134: # Don't allow users to manipulate folder
1135: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1136: '.nomanip.gif';
1137: $icon = "<img src='$location/$icon' alt='".
1138: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1139:
1140: $linkopen = "";
1141: $linkclose = "";
1142: }
1143: }
1144:
1145: if ($resource->randomout()) {
1146: $nonLinkedText .= ' <i>(hidden)</i> ';
1147: }
1148: if (!$resource->condval()) {
1149: $nonLinkedText .= ' <i>(conditionally hidden)</i> ';
1150: }
1151:
1152: # We're done preparing and finally ready to start the rendering
1153: my $result = "<td align='left' valign='center'>";
1154:
1155: my $indentLevel = $params->{'indentLevel'};
1156: if ($newBranchText) { $indentLevel--; }
1157:
1158: # print indentation
1159: for (my $i = 0; $i < $indentLevel; $i++) {
1160: $result .= $params->{'indentString'};
1161: }
1162:
1163: # Decide what to display
1164:
1165: $result .= "$newBranchText$linkopen$icon$linkclose";
1166:
1167: my $curMarkerBegin = '';
1168: my $curMarkerEnd = '';
1169:
1170: # Is this the current resource?
1171: if (!$params->{'displayedHereMarker'} &&
1172: $resource->symb() eq $params->{'here'} ) {
1173: $curMarkerBegin = '<font color="red" size="+2">></font>';
1174: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1175: $params->{'displayedHereMarker'} = 1;
1176: }
1177:
1178: if ($resource->is_problem() && $part ne '0' &&
1179: !$params->{'condensed'}) {
1180: my $displaypart=$resource->part_display($part);
1181: $partLabel = " (Part: $displaypart)";
1182: if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1183: $title = "";
1184: }
1185:
1186: if ($params->{'condensed'} && $resource->countParts() > 1) {
1187: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1188: }
1189:
1190: my $target;
1191: if ($env{'environment.remotenavmap'} eq 'on') {
1192: $target=' target="loncapaclient" ';
1193: }
1194: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1195: $result .= " $curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1196: } else {
1197: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1198: }
1199:
1200: return $result;
1201: }
1202:
1203: sub render_communication_status {
1204: my ($resource, $part, $params) = @_;
1205: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1206:
1207: my $link = $params->{"resourceLink"};
1208: my $target;
1209: if ($env{'environment.remotenavmap'} eq 'on') {
1210: $target=' target="loncapaclient" ';
1211: }
1212: my $linkopen = "<a $target href=\"$link\">";
1213: my $linkclose = "</a>";
1214: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1215: if ($resource->hasDiscussion()) {
1216: $discussionHTML = $linkopen .
1217: '<img border="0" src="'.$location.'/chat.gif" />' .
1218: $linkclose;
1219: }
1220:
1221: if ($resource->getFeedback()) {
1222: my $feedback = $resource->getFeedback();
1223: foreach (split(/\,/, $feedback)) {
1224: if ($_) {
1225: $feedbackHTML .= ' <a '.$target.' href="/adm/email?display='
1226: . &Apache::lonnet::escape($_) . '">'
1227: . '<img src="'.$location.'/feedback.gif" '
1228: . 'border="0" /></a>';
1229: }
1230: }
1231: }
1232:
1233: if ($resource->getErrors()) {
1234: my $errors = $resource->getErrors();
1235: my $errorcount = 0;
1236: foreach (split(/,/, $errors)) {
1237: last if ($errorcount>=10); # Only output 10 bombs maximum
1238: if ($_) {
1239: $errorcount++;
1240: $errorHTML .= ' <a '.$target.' href="/adm/email?display='
1241: . &Apache::lonnet::escape($_) . '">'
1242: . '<img src="'.$location.'/bomb.gif" '
1243: . 'border="0" /></a>';
1244: }
1245: }
1246: }
1247:
1248: if ($params->{'multipart'} && $part != '0') {
1249: $discussionHTML = $feedbackHTML = $errorHTML = '';
1250: }
1251:
1252: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1253:
1254: }
1255: sub render_quick_status {
1256: my ($resource, $part, $params) = @_;
1257: my $result = "";
1258: my $firstDisplayed = !$params->{'condensed'} &&
1259: $params->{'multipart'} && $part eq "0";
1260:
1261: my $link = $params->{"resourceLink"};
1262: my $target;
1263: if ($env{'environment.remotenavmap'} eq 'on') {
1264: $target=' target="loncapaclient" ';
1265: }
1266: my $linkopen = "<a $target href=\"$link\">";
1267: my $linkclose = "</a>";
1268:
1269: if ($resource->is_problem() &&
1270: !$firstDisplayed) {
1271:
1272: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1273: my $alt = $iconAltTags{$icon};
1274: if ($icon) {
1275: my $location=
1276: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1277: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1278: } else {
1279: $result .= "<td width='30'> </td>\n";
1280: }
1281: } else { # not problem, no icon
1282: $result .= "<td width='30'> </td>\n";
1283: }
1284:
1285: return $result;
1286: }
1287: sub render_long_status {
1288: my ($resource, $part, $params) = @_;
1289: my $result = "<td align='right' valign='center'>\n";
1290: my $firstDisplayed = !$params->{'condensed'} &&
1291: $params->{'multipart'} && $part eq "0";
1292:
1293: my $color;
1294: if ($resource->is_problem()) {
1295: $color = $colormap{$resource->status};
1296:
1297: if (dueInLessThan24Hours($resource, $part) ||
1298: lastTry($resource, $part)) {
1299: $color = $hurryUpColor;
1300: }
1301: }
1302:
1303: if ($resource->kind() eq "res" &&
1304: $resource->is_problem() &&
1305: !$firstDisplayed) {
1306: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1307: $result .= getDescription($resource, $part);
1308: if ($color) {$result .= "</b></font>"; }
1309: }
1310: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1311: $result .= '(randomly select ' . $resource->randompick() .')';
1312: }
1313:
1314: # Debugging code
1315: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1316: # ' - Part: ' . $part;
1317:
1318: $result .= "</td>\n";
1319:
1320: return $result;
1321: }
1322:
1323: # Colors obtained by taking the icons, matching the colors, and
1324: # possibly reducing the Value (HSV) of the color, if it's too bright
1325: # for text, generally by one third or so.
1326: my %statusColors =
1327: (
1328: $resObj->CLOSED => '#000000',
1329: $resObj->OPEN => '#998b13',
1330: $resObj->CORRECT => '#26933f',
1331: $resObj->INCORRECT => '#c48207',
1332: $resObj->ATTEMPTED => '#a87510',
1333: $resObj->ERROR => '#000000'
1334: );
1335: my %statusStrings =
1336: (
1337: $resObj->CLOSED => 'Not yet open',
1338: $resObj->OPEN => 'Open',
1339: $resObj->CORRECT => 'Correct',
1340: $resObj->INCORRECT => 'Incorrect',
1341: $resObj->ATTEMPTED => 'Attempted',
1342: $resObj->ERROR => 'Network Error'
1343: );
1344: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1345:
1346: use Data::Dumper;
1347: sub render_parts_summary_status {
1348: my ($resource, $part, $params) = @_;
1349: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1350: if ($params->{showParts}) {
1351: return '<td></td>';
1352: }
1353:
1354: my $td = "<td align='right'>\n";
1355: my $endtd = "</td>\n";
1356: my @probs;
1357:
1358: if ($resource->contains_problem) {
1359: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1360: } else {
1361: @probs=($resource);
1362: }
1363: my $return;
1364: my %overallstatus;
1365: my $totalParts;
1366: foreach my $resource (@probs) {
1367: # If there is a single part, just show the simple status
1368: if ($resource->singlepart()) {
1369: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1370: $overallstatus{$status}++;
1371: $totalParts++;
1372: next;
1373: }
1374: # Now we can be sure the $part doesn't really matter.
1375: my $statusCount = $resource->simpleStatusCount();
1376: my @counts;
1377: foreach my $status (@statuses) {
1378: # decouple display order from the simpleStatusCount order
1379: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1380: if ($statusCount->[$slot]) {
1381: $overallstatus{$status}+=$statusCount->[$slot];
1382: $totalParts+=$statusCount->[$slot];
1383: }
1384: }
1385: }
1386: $return.= $td . $totalParts . ' parts: ';
1387: foreach my $status (@statuses) {
1388: if ($overallstatus{$status}) {
1389: $return.="<font color='" . $statusColors{$status} .
1390: "'>" . $overallstatus{$status} . ' '
1391: . $statusStrings{$status} . "</font>";
1392: }
1393: }
1394: $return.= $endtd;
1395: return $return;
1396: }
1397:
1398: my @preparedColumns = (\&render_resource, \&render_communication_status,
1399: \&render_quick_status, \&render_long_status,
1400: \&render_parts_summary_status);
1401:
1402: sub setDefault {
1403: my ($val, $default) = @_;
1404: if (!defined($val)) { return $default; }
1405: return $val;
1406: }
1407:
1408: sub cmp_title {
1409: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1410: $atitle=~s/^\s*//;
1411: $btitle=~s/^\s*//;
1412: return $atitle cmp $btitle;
1413: }
1414:
1415: sub render {
1416: my $args = shift;
1417: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1418: my $result = '';
1419: # Configure the renderer.
1420: my $cols = $args->{'cols'};
1421: if (!defined($cols)) {
1422: # no columns, no nav maps.
1423: return '';
1424: }
1425: my $navmap;
1426: if (defined($args->{'navmap'})) {
1427: $navmap = $args->{'navmap'};
1428: }
1429:
1430: my $r = $args->{'r'};
1431: my $queryString = $args->{'queryString'};
1432: my $jump = $args->{'jump'};
1433: my $here = $args->{'here'};
1434: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1435: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1436: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1437: # before the current resource when using #current
1438:
1439: # If we were passed 'here' information, we are not rendering
1440: # after a folder manipulation, and we were not passed an
1441: # iterator, make sure we open the folders to show the "here"
1442: # marker
1443: my $filterHash = {};
1444: # Figure out what we're not displaying
1445: foreach (split(/\,/, $env{"form.filter"})) {
1446: if ($_) {
1447: $filterHash->{$_} = "1";
1448: }
1449: }
1450:
1451: # Filter: Remember filter function and add our own filter: Refuse
1452: # to show hidden resources unless the user can see them.
1453: my $userCanSeeHidden = advancedUser();
1454: my $filterFunc = setDefault($args->{'filterFunc'},
1455: sub {return 1;});
1456: if (!$userCanSeeHidden) {
1457: # Without renaming the filterfunc, the server seems to go into
1458: # an infinite loop
1459: my $oldFilterFunc = $filterFunc;
1460: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1461: &$oldFilterFunc($res);};
1462: }
1463:
1464: my $condition = 0;
1465: if ($env{'form.condition'}) {
1466: $condition = 1;
1467: }
1468:
1469: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1470: # Step 1: Check to see if we have a navmap
1471: if (!defined($navmap)) {
1472: $navmap = Apache::lonnavmaps::navmap->new();
1473: if (!defined($navmap)) {
1474: # no londer in course
1475: return '<font color="red">No course selected</font><br />
1476: <a href="/adm/roles">Select a course</a><br />';
1477: }
1478: }
1479:
1480: # Step two: Locate what kind of here marker is necessary
1481: # Determine where the "here" marker is and where the screen jumps to.
1482:
1483: if ($env{'form.postsymb'} ne '') {
1484: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1485: } elsif ($env{'form.postdata'} ne '') {
1486: # couldn't find a symb, is there a URL?
1487: my $currenturl = $env{'form.postdata'};
1488: #$currenturl=~s/^http\:\/\///;
1489: #$currenturl=~s/^[^\/]+//;
1490:
1491: $here = $jump = &Apache::lonnet::symbread($currenturl);
1492: }
1493: if ($here eq '') {
1494: my $last;
1495: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1496: &GDBM_READER(),0640)) {
1497: $last=$hash{'last_known'};
1498: untie(%hash);
1499: }
1500: if ($last) { $here = $jump = $last; }
1501: }
1502:
1503: # Step three: Ensure the folders are open
1504: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1505: my $curRes;
1506: my $found = 0;
1507:
1508: # We only need to do this if we need to open the maps to show the
1509: # current position. This will change the counter so we can't count
1510: # for the jump marker with this loop.
1511: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1512: if (ref($curRes) && $curRes->symb() eq $here) {
1513: my $mapStack = $mapIterator->getStack();
1514:
1515: # Ensure the parent maps are open
1516: for my $map (@{$mapStack}) {
1517: if ($condition) {
1518: undef $filterHash->{$map->map_pc()};
1519: } else {
1520: $filterHash->{$map->map_pc()} = 1;
1521: }
1522: }
1523: $found = 1;
1524: }
1525: }
1526: }
1527:
1528: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1529: # If this is a click on a folder or something, we want to preserve the "here"
1530: # from the querystring, and get the new "jump" marker
1531: $here = $env{'form.here'};
1532: $jump = $env{'form.jump'};
1533: }
1534:
1535: my $it = $args->{'iterator'};
1536: if (!defined($it)) {
1537: # Construct a default iterator based on $env{'form.'} information
1538:
1539: # Step 1: Check to see if we have a navmap
1540: if (!defined($navmap)) {
1541: $navmap = Apache::lonnavmaps::navmap->new();
1542: }
1543:
1544: # See if we're being passed a specific map
1545: if ($args->{'iterator_map'}) {
1546: my $map = $args->{'iterator_map'};
1547: $map = $navmap->getResourceByUrl($map);
1548: my $firstResource = $map->map_start();
1549: my $finishResource = $map->map_finish();
1550:
1551: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1552: } else {
1553: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1554: }
1555: }
1556:
1557: # (re-)Locate the jump point, if any
1558: # Note this does not take filtering or hidden into account... need
1559: # to be fixed?
1560: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1561: my $curRes;
1562: my $foundJump = 0;
1563: my $counter = 0;
1564:
1565: while (($curRes = $mapIterator->next()) && !$foundJump) {
1566: if (ref($curRes)) { $counter++; }
1567:
1568: if (ref($curRes) && $jump eq $curRes->symb()) {
1569:
1570: # This is why we have to use the main iterator instead of the
1571: # potentially faster DFS: The count has to be the same, so
1572: # the order has to be the same, which DFS won't give us.
1573: $args->{'currentJumpIndex'} = $counter;
1574: $foundJump = 1;
1575: }
1576: }
1577:
1578: my $showParts = setDefault($args->{'showParts'}, 1);
1579: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1580: # keeps track of when the current resource is found,
1581: # so we can back up a few and put the anchor above the
1582: # current resource
1583: my $printKey = $args->{'printKey'};
1584: my $printCloseAll = $args->{'printCloseAll'};
1585: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1586:
1587: # Print key?
1588: if ($printKey) {
1589: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1590: my $date=localtime;
1591: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1592: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1593: if ($navmap->{LAST_CHECK}) {
1594: $result .=
1595: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1596: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1597: '</td><td align="center" valign="bottom"> '.
1598: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1599: '</td>';
1600: } else {
1601: $result .= '<td align="center" valign="bottom"> '.
1602: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1603: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1604: '</td>';
1605: }
1606:
1607: $result .= '</tr></table>';
1608: }
1609:
1610: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1611: my ($link,$text);
1612: if ($condition) {
1613: $link='"navmaps?condition=0&filter=&'.$queryString.
1614: '&here='.&Apache::lonnet::escape($here).'"';
1615: $text='Close All Folders';
1616: } else {
1617: $link='"navmaps?condition=1&filter=&'.$queryString.
1618: '&here='.&Apache::lonnet::escape($here).'"';
1619: $text='Open All Folders';
1620: }
1621: if ($args->{'caller'} eq 'navmapsdisplay') {
1622: &add_linkitem($args->{'linkitems'},'changefolder',
1623: 'location.href='.$link,$text);
1624: } else {
1625: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1626: }
1627: $result .= "\n";
1628: }
1629:
1630: # Check for any unread discussions in all resources.
1631: if ($args->{'caller'} eq 'navmapsdisplay') {
1632: &add_linkitem($args->{'linkitems'},'clearbubbles',
1633: 'document.clearbubbles.submit()',
1634: 'Mark all posts read');
1635: my $time=time;
1636: $result .= (<<END);
1637: <form name="clearbubbles" method="post" action="/adm/feedback">
1638: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1639: <input type="hidden" name="navtime" value="$time" />
1640: END
1641: if ($args->{'sort'} eq 'discussion') {
1642: my $totdisc = 0;
1643: my $haveDisc = '';
1644: my @allres=$navmap->retrieveResources();
1645: foreach my $resource (@allres) {
1646: if ($resource->hasDiscussion()) {
1647: $haveDisc .= $resource->wrap_symb().':';
1648: $totdisc ++;
1649: }
1650: }
1651: if ($totdisc > 0) {
1652: $haveDisc =~ s/:$//;
1653: $result .= (<<END);
1654: <input type="hidden" name="navmaps" value="$haveDisc" />
1655: </form>
1656: END
1657: }
1658: }
1659: $result.='</form>';
1660: }
1661:
1662: if ($args->{'caller'} eq 'navmapsdisplay') {
1663: $result .= '<table><tr><td>'.
1664: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1665: if ($env{'environment.remotenavmap'} ne 'on') {
1666: $result .= '<td> </td>';
1667: } else {
1668: $result .= '</tr><tr>';
1669: }
1670: $result.=&show_linkitems($args->{'linkitems'});
1671: if ($args->{'sort_html'}) {
1672: if ($env{'environment.remotenavmap'} ne 'on') {
1673: $result.='<td> </td><td> </td><td> </td>'.
1674: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1675: } else {
1676: $result.='</tr><tr><td align="left"><br />'.
1677: $args->{'sort_html'}.'</td></tr>';
1678: }
1679: }
1680: $result .= '</table>';
1681: } elsif ($args->{'sort_html'}) {
1682: $result.=$args->{'sort_html'};
1683: }
1684:
1685: $result .= "<br />\n";
1686: if ($r) {
1687: $r->print($result);
1688: $r->rflush();
1689: $result = "";
1690: }
1691: # End parameter setting
1692:
1693: # Data
1694: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1695: my $res = "Apache::lonnavmaps::resource";
1696: my %condenseStatuses =
1697: ( $res->NETWORK_FAILURE => 1,
1698: $res->NOTHING_SET => 1,
1699: $res->CORRECT => 1 );
1700: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1701:
1702: # Shared variables
1703: $args->{'counter'} = 0; # counts the rows
1704: $args->{'indentLevel'} = 0;
1705: $args->{'isNewBranch'} = 0;
1706: $args->{'condensed'} = 0;
1707: my $location=
1708: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1709: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1710: $args->{'displayedHereMarker'} = 0;
1711:
1712: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1713: # since structure actually doesn't matter, except what map has what resources.
1714: if ($args->{'suppressEmptySequences'}) {
1715: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1716: $it->{FIRST_RESOURCE},
1717: $it->{FINISH_RESOURCE},
1718: {}, undef, 1);
1719: my $depth = 0;
1720: $dfsit->next();
1721: my $curRes = $dfsit->next();
1722: while ($depth > -1) {
1723: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1724: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1725:
1726: if (ref($curRes)) {
1727: # Parallel pre-processing: Do sequences have non-filtered-out children?
1728: if ($curRes->is_map()) {
1729: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1730: # Sequences themselves do not count as visible children,
1731: # unless those sequences also have visible children.
1732: # This means if a sequence appears, there's a "promise"
1733: # that there's something under it if you open it, somewhere.
1734: } else {
1735: # Not a sequence: if it's filtered, ignore it, otherwise
1736: # rise up the stack and mark the sequences as having children
1737: if (&$filterFunc($curRes)) {
1738: for my $sequence (@{$dfsit->getStack()}) {
1739: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1740: }
1741: }
1742: }
1743: }
1744: } continue {
1745: $curRes = $dfsit->next();
1746: }
1747: }
1748:
1749: my $displayedJumpMarker = 0;
1750: # Set up iteration.
1751: my $now = time();
1752: my $in24Hours = $now + 24 * 60 * 60;
1753: my $rownum = 0;
1754:
1755: # export "here" marker information
1756: $args->{'here'} = $here;
1757:
1758: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1759: my @resources;
1760: my $code='';# sub { !(shift->is_map();) };
1761: if ($args->{'sort'} eq 'title') {
1762: my $oldFilterFunc = $filterFunc;
1763: my $filterFunc=
1764: sub {
1765: my ($res)=@_;
1766: if ($res->is_map()) { return 0;}
1767: return &$oldFilterFunc($res);
1768: };
1769: @resources=$navmap->retrieveResources(undef,$filterFunc);
1770: @resources= sort { &cmp_title($a,$b) } @resources;
1771: } elsif ($args->{'sort'} eq 'duedate') {
1772: my $oldFilterFunc = $filterFunc;
1773: my $filterFunc=
1774: sub {
1775: my ($res)=@_;
1776: if (!$res->is_problem()) { return 0;}
1777: return &$oldFilterFunc($res);
1778: };
1779: @resources=$navmap->retrieveResources(undef,$filterFunc);
1780: @resources= sort {
1781: if ($a->duedate ne $b->duedate) {
1782: return $a->duedate cmp $b->duedate;
1783: }
1784: my $value=&cmp_title($a,$b);
1785: return $value;
1786: } @resources;
1787: } elsif ($args->{'sort'} eq 'discussion') {
1788: my $oldFilterFunc = $filterFunc;
1789: my $filterFunc=
1790: sub {
1791: my ($res)=@_;
1792: if (!$res->hasDiscussion() &&
1793: !$res->getFeedback() &&
1794: !$res->getErrors()) { return 0;}
1795: return &$oldFilterFunc($res);
1796: };
1797: @resources=$navmap->retrieveResources(undef,$filterFunc);
1798: @resources= sort { &cmp_title($a,$b) } @resources;
1799: } else {
1800: #unknow sort mechanism or default
1801: undef($args->{'sort'});
1802: }
1803:
1804:
1805: while (1) {
1806: if ($args->{'sort'}) {
1807: $curRes = shift(@resources);
1808: } else {
1809: $curRes = $it->next($closeAllPages);
1810: }
1811: if (!$curRes) { last; }
1812:
1813: # Maintain indentation level.
1814: if ($curRes == $it->BEGIN_MAP() ||
1815: $curRes == $it->BEGIN_BRANCH() ) {
1816: $args->{'indentLevel'}++;
1817: }
1818: if ($curRes == $it->END_MAP() ||
1819: $curRes == $it->END_BRANCH() ) {
1820: $args->{'indentLevel'}--;
1821: }
1822: # Notice new branches
1823: if ($curRes == $it->BEGIN_BRANCH()) {
1824: $args->{'isNewBranch'} = 1;
1825: }
1826:
1827: # If this isn't an actual resource, continue on
1828: if (!ref($curRes)) {
1829: next;
1830: }
1831:
1832: # If this has been filtered out, continue on
1833: if (!(&$filterFunc($curRes))) {
1834: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1835: next;
1836: }
1837:
1838: # If this is an empty sequence and we're filtering them, continue on
1839: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1840: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1841: next;
1842: }
1843:
1844: # If we're suppressing navmaps and this is a navmap, continue on
1845: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1846: next;
1847: }
1848:
1849: $args->{'counter'}++;
1850:
1851: # Does it have multiple parts?
1852: $args->{'multipart'} = 0;
1853: $args->{'condensed'} = 0;
1854: my @parts;
1855:
1856: # Decide what parts to show.
1857: if ($curRes->is_problem() && $showParts) {
1858: @parts = @{$curRes->parts()};
1859: $args->{'multipart'} = $curRes->multipart();
1860:
1861: if ($condenseParts) { # do the condensation
1862: if (!$args->{'condensed'}) {
1863: # Decide whether to condense based on similarity
1864: my $status = $curRes->status($parts[0]);
1865: my $due = $curRes->duedate($parts[0]);
1866: my $open = $curRes->opendate($parts[0]);
1867: my $statusAllSame = 1;
1868: my $dueAllSame = 1;
1869: my $openAllSame = 1;
1870: for (my $i = 1; $i < scalar(@parts); $i++) {
1871: if ($curRes->status($parts[$i]) != $status){
1872: $statusAllSame = 0;
1873: }
1874: if ($curRes->duedate($parts[$i]) != $due ) {
1875: $dueAllSame = 0;
1876: }
1877: if ($curRes->opendate($parts[$i]) != $open) {
1878: $openAllSame = 0;
1879: }
1880: }
1881: # $*allSame is true if all the statuses were
1882: # the same. Now, if they are all the same and
1883: # match one of the statuses to condense, or they
1884: # are all open with the same due date, or they are
1885: # all OPEN_LATER with the same open date, display the
1886: # status of the first non-zero part (to get the 'correct'
1887: # status right, since 0 is never 'correct' or 'open').
1888: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1889: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1890: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1891: @parts = ($parts[0]);
1892: $args->{'condensed'} = 1;
1893: }
1894: }
1895: # Multipart problem with one part: always "condense" (happens
1896: # to match the desirable behavior)
1897: if ($curRes->countParts() == 1) {
1898: @parts = ($parts[0]);
1899: $args->{'condensed'} = 1;
1900: }
1901: }
1902: }
1903:
1904: # If the multipart problem was condensed, "forget" it was multipart
1905: if (scalar(@parts) == 1) {
1906: $args->{'multipart'} = 0;
1907: } else {
1908: # Add part 0 so we display it correctly.
1909: unshift @parts, '0';
1910: }
1911:
1912: {
1913: my ($src,$symb,$anchor,$stack);
1914: if ($args->{'sort'}) {
1915: my $it = $navmap->getIterator(undef, undef, undef, 1);
1916: while ( my $res=$it->next()) {
1917: if (ref($res) &&
1918: $res->symb() eq $curRes->symb()) { last; }
1919: }
1920: $stack=$it->getStack();
1921: } else {
1922: $stack=$it->getStack();
1923: }
1924: ($src,$symb,$anchor)=getLinkForResource($stack);
1925: if (defined($anchor)) { $anchor='#'.$anchor; }
1926: my $srcHasQuestion = $src =~ /\?/;
1927: $args->{"resourceLink"} = $src.
1928: ($srcHasQuestion?'&':'?') .
1929: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1930: }
1931: # Now, we've decided what parts to show. Loop through them and
1932: # show them.
1933: foreach my $part (@parts) {
1934: $rownum ++;
1935: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1936:
1937: $result .= " <tr bgcolor='$backgroundColor'>\n";
1938:
1939: # Set up some data about the parts that the cols might want
1940: my $filter = $it->{FILTER};
1941:
1942: # Now, display each column.
1943: foreach my $col (@$cols) {
1944: my $colHTML = '';
1945: if (ref($col)) {
1946: $colHTML .= &$col($curRes, $part, $args);
1947: } else {
1948: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1949: }
1950:
1951: # If this is the first column and it's time to print
1952: # the anchor, do so
1953: if ($col == $cols->[0] &&
1954: $args->{'counter'} == $args->{'currentJumpIndex'} -
1955: $currentJumpDelta) {
1956: # Jam the anchor after the <td> tag;
1957: # necessary for valid HTML (which Mozilla requires)
1958: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1959: $displayedJumpMarker = 1;
1960: }
1961: $result .= $colHTML . "\n";
1962: }
1963: $result .= " </tr>\n";
1964: $args->{'isNewBranch'} = 0;
1965: }
1966:
1967: if ($r && $rownum % 20 == 0) {
1968: $r->print($result);
1969: $result = "";
1970: $r->rflush();
1971: }
1972: } continue {
1973: if ($r) {
1974: # If we have the connection, make sure the user is still connected
1975: my $c = $r->connection;
1976: if ($c->aborted()) {
1977: # Who cares what we do, nobody will see it anyhow.
1978: return '';
1979: }
1980: }
1981: }
1982:
1983: # Print out the part that jumps to #curloc if it exists
1984: # delay needed because the browser is processing the jump before
1985: # it finishes rendering, so it goes to the wrong place!
1986: # onload might be better, but this routine has no access to that.
1987: # On mozilla, the 0-millisecond timeout seems to prevent this;
1988: # it's quite likely this might fix other browsers, too, and
1989: # certainly won't hurt anything.
1990: if ($displayedJumpMarker) {
1991: $result .= "
1992: <script>
1993: if (location.href.indexOf('#curloc')==-1) {
1994: setTimeout(\"location += '#curloc';\", 0)
1995: }
1996: </script>";
1997: }
1998:
1999: $result .= "</table>";
2000:
2001: if ($r) {
2002: $r->print($result);
2003: $result = "";
2004: $r->rflush();
2005: }
2006:
2007: return $result;
2008: }
2009:
2010: sub add_linkitem {
2011: my ($linkitems,$name,$cmd,$text)=@_;
2012: $$linkitems{$name}{'cmd'}=$cmd;
2013: $$linkitems{$name}{'text'}=&mt($text);
2014: }
2015:
2016: sub show_linkitems {
2017: my ($linkitems)=@_;
2018: my @linkorder = ("blank","launchnav","closenav","firsthomework",
2019: "everything","uncompleted","changefolder","clearbubbles");
2020:
2021: my $result .= (<<ENDBLOCK);
2022: <td align="left">
2023: <script type="text/javascript">
2024: function changeNavDisplay () {
2025: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
2026: ENDBLOCK
2027: foreach my $link (@linkorder) {
2028: $result.= "if (navchoice == '$link') {".
2029: $linkitems->{$link}{'cmd'}."}\n";
2030: }
2031: $result.='}
2032: </script>
2033: <form name="linkitems" method="post">
2034: <nobr><select name="toplink">'."\n";
2035: foreach my $link (@linkorder) {
2036: if (defined($linkitems->{$link})) {
2037: if ($linkitems->{$link}{'text'} ne '') {
2038: $result .= ' <option value="'.$link.'">'.
2039: $linkitems->{$link}{'text'}."</option>\n";
2040: }
2041: }
2042: }
2043: $result .= '</select> <input type="button" name="chgnav"
2044: value="Go" onClick="javascript:changeNavDisplay()" />
2045: </nobr></form></td>'."\n";
2046:
2047: return $result;
2048: }
2049:
2050: 1;
2051:
2052: package Apache::lonnavmaps::navmap;
2053:
2054: =pod
2055:
2056: =head1 Object: Apache::lonnavmaps::navmap
2057:
2058: =head2 Overview
2059:
2060: The navmap object's job is to provide access to the resources
2061: in the course as Apache::lonnavmaps::resource objects, and to
2062: query and manage the relationship between those resource objects.
2063:
2064: Generally, you'll use the navmap object in one of three basic ways.
2065: In order of increasing complexity and power:
2066:
2067: =over 4
2068:
2069: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2070: various ways to obtain resource objects, based on various identifiers.
2071: Use this when you want to request information about one object or
2072: a handful of resources you already know the identities of, from some
2073: other source. For more about Ids, Symbs, and MapPcs, see the
2074: Resource documentation. Note that Url should be a B<last resort>,
2075: not your first choice; it only works when there is only one
2076: instance of the resource in the course, which only applies to
2077: maps, and even that may change in the future.
2078:
2079: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2080: retrieves resources matching some criterion and returns them
2081: in a flat array, with no structure information. Use this when
2082: you are manipulating a series of resources, based on what map
2083: the are in, but do not care about branching, or exactly how
2084: the maps and resources are related. This is the most common case.
2085:
2086: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2087: the course's navmap in various ways without writing the traversal
2088: code yourself. See iterator documentation below. Use this when
2089: you need to know absolutely everything about the course, including
2090: branches and the precise relationship between maps and resources.
2091:
2092: =back
2093:
2094: =head2 Creation And Destruction
2095:
2096: To create a navmap object, use the following function:
2097:
2098: =over 4
2099:
2100: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2101:
2102: Creates a new navmap object. Returns the navmap object if this is
2103: successful, or B<undef> if not.
2104:
2105: =back
2106:
2107: =head2 Methods
2108:
2109: =over 4
2110:
2111: =item * B<getIterator>(first, finish, filter, condition):
2112:
2113: See iterator documentation below.
2114:
2115: =cut
2116:
2117: use strict;
2118: use GDBM_File;
2119: use Apache::lonnet;
2120:
2121: sub new {
2122: # magic invocation to create a class instance
2123: my $proto = shift;
2124: my $class = ref($proto) || $proto;
2125: my $self = {};
2126:
2127: # Resource cache stores navmap resources as we reference them. We generate
2128: # them on-demand so we don't pay for creating resources unless we use them.
2129: $self->{RESOURCE_CACHE} = {};
2130:
2131: # Network failure flag, if we accessed the course or user opt and
2132: # failed
2133: $self->{NETWORK_FAILURE} = 0;
2134:
2135: # tie the nav hash
2136:
2137: my %navmaphash;
2138: my %parmhash;
2139: my $courseFn = $env{"request.course.fn"};
2140: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2141: &GDBM_READER(), 0640))) {
2142: return undef;
2143: }
2144:
2145: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2146: &GDBM_READER(), 0640)))
2147: {
2148: untie %{$self->{PARM_HASH}};
2149: return undef;
2150: }
2151:
2152: $self->{NAV_HASH} = \%navmaphash;
2153: $self->{PARM_HASH} = \%parmhash;
2154: $self->{PARM_CACHE} = {};
2155:
2156: bless($self);
2157:
2158: return $self;
2159: }
2160:
2161: sub generate_course_user_opt {
2162: my $self = shift;
2163: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2164:
2165: my $uname=$env{'user.name'};
2166: my $udom=$env{'user.domain'};
2167: my $cid=$env{'request.course.id'};
2168: my $cdom=$env{'course.'.$cid.'.domain'};
2169: my $cnum=$env{'course.'.$cid.'.num'};
2170:
2171: # ------------------------------------------------- Get coursedata (if present)
2172: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2173: # Check for network failure
2174: if (!ref($courseopt)) {
2175: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2176: $self->{NETWORK_FAILURE} = 1;
2177: }
2178: undef($courseopt);
2179: }
2180:
2181: # --------------------------------------------------- Get userdata (if present)
2182:
2183: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2184: # Check for network failure
2185: if (!ref($useropt)) {
2186: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2187: $self->{NETWORK_FAILURE} = 1;
2188: }
2189: undef($useropt);
2190: }
2191:
2192: $self->{COURSE_OPT} = $courseopt;
2193: $self->{USER_OPT} = $useropt;
2194:
2195: $self->{COURSE_USER_OPT_GENERATED} = 1;
2196:
2197: return;
2198: }
2199:
2200: sub generate_email_discuss_status {
2201: my $self = shift;
2202: my $symb = shift;
2203: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2204:
2205: my $cid=$env{'request.course.id'};
2206: my $cdom=$env{'course.'.$cid.'.domain'};
2207: my $cnum=$env{'course.'.$cid.'.num'};
2208:
2209: my %emailstatus = &Apache::lonnet::dump('email_status');
2210: my $logoutTime = $emailstatus{'logout'};
2211: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2212: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2213: $courseLeaveTime : $logoutTime);
2214: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2215: $cdom, $cnum);
2216: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2217: $env{'user.domain'},$env{'user.name'},'lastread');
2218: my %lastreadtime = ();
2219: foreach (keys %lastread) {
2220: my $key = $_;
2221: $key =~ s/_lastread$//;
2222: $lastreadtime{$key} = $lastread{$_};
2223: }
2224:
2225: my %feedback=();
2226: my %error=();
2227: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2228: $env{'user.name'});
2229:
2230: foreach my $msgid (@keys) {
2231: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2232: my $plain=
2233: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2234: if ($plain=~/ \[([^\]]+)\]\:/) {
2235: my $url=$1;
2236: if ($plain=~/\:Error \[/) {
2237: $error{$url}.=','.$msgid;
2238: } else {
2239: $feedback{$url}.=','.$msgid;
2240: }
2241: }
2242: }
2243: }
2244:
2245: #url's of resources that have feedbacks
2246: $self->{FEEDBACK} = \%feedback;
2247: #or errors
2248: $self->{ERROR_MSG} = \%error;
2249: $self->{DISCUSSION_TIME} = \%discussiontime;
2250: $self->{EMAIL_STATUS} = \%emailstatus;
2251: $self->{LAST_READ} = \%lastreadtime;
2252:
2253: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2254: }
2255:
2256: sub get_user_data {
2257: my $self = shift;
2258: if ($self->{RETRIEVED_USER_DATA}) { return; }
2259:
2260: # Retrieve performance data on problems
2261: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2262: $env{'user.domain'},
2263: $env{'user.name'});
2264: $self->{STUDENT_DATA} = \%student_data;
2265:
2266: $self->{RETRIEVED_USER_DATA} = 1;
2267: }
2268:
2269: sub get_discussion_data {
2270: my $self = shift;
2271: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2272: return $self->{DISCUSSION_DATA};
2273: }
2274:
2275: my $cid=$env{'request.course.id'};
2276: my $cdom=$env{'course.'.$cid.'.domain'};
2277: my $cnum=$env{'course.'.$cid.'.num'};
2278:
2279: # Retrieve discussion data for resources in course
2280: my %discussion_data = &Apache::lonnet::dump($cid,$cdom,$cnum);
2281:
2282: $self->{DISCUSSION_DATA} = \%discussion_data;
2283: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2284: return $self->{DISCUSSION_DATA};
2285: }
2286:
2287:
2288: # Internal function: Takes a key to look up in the nav hash and implements internal
2289: # memory caching of that key.
2290: sub navhash {
2291: my $self = shift; my $key = shift;
2292: return $self->{NAV_HASH}->{$key};
2293: }
2294:
2295: =pod
2296:
2297: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2298: false otherwise. Undefined course maps indicate an error somewhere in
2299: LON-CAPA, and you will not be able to proceed with using the navmap.
2300: See the B<NAV> screen for an example of using this.
2301:
2302: =cut
2303:
2304: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2305: sub courseMapDefined {
2306: my $self = shift;
2307: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2308:
2309: my $firstres = $self->navhash("map_start_$uri");
2310: my $lastres = $self->navhash("map_finish_$uri");
2311: return $firstres && $lastres;
2312: }
2313:
2314: sub getIterator {
2315: my $self = shift;
2316: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2317: shift, undef, shift,
2318: shift, shift);
2319: return $iterator;
2320: }
2321:
2322: # Private method: Does the given resource (as a symb string) have
2323: # current discussion? Returns 0 if chat/mail data not extracted.
2324: sub hasDiscussion {
2325: my $self = shift;
2326: my $symb = shift;
2327: $self->generate_email_discuss_status();
2328:
2329: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2330:
2331: #return defined($self->{DISCUSSION_TIME}->{$symb});
2332:
2333: # backward compatibility (bulletin boards used to be 'wrapped')
2334: my $ressymb = $self->wrap_symb($symb);
2335: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2336: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2337: } else {
2338: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2339: 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).
2340: }
2341: }
2342:
2343: sub wrap_symb {
2344: my $self = shift;
2345: my $symb = shift;
2346: if ($symb =~ m-___(adm/\w+/\w+/)(\d+)(/bulletinboard)$-) {
2347: unless ($symb =~ m|adm/wrapper/adm|) {
2348: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2349: }
2350: }
2351: return $symb;
2352: }
2353:
2354: # Private method: Does the given resource (as a symb string) have
2355: # current feedback? Returns the string in the feedback hash, which
2356: # will be false if it does not exist.
2357:
2358: sub getFeedback {
2359: my $self = shift;
2360: my $symb = shift;
2361:
2362: $self->generate_email_discuss_status();
2363:
2364: if (!defined($self->{FEEDBACK})) { return ""; }
2365:
2366: return $self->{FEEDBACK}->{$symb};
2367: }
2368:
2369: # Private method: Get the errors for that resource (by source).
2370: sub getErrors {
2371: my $self = shift;
2372: my $src = shift;
2373:
2374: $self->generate_email_discuss_status();
2375:
2376: if (!defined($self->{ERROR_MSG})) { return ""; }
2377: return $self->{ERROR_MSG}->{$src};
2378: }
2379:
2380: =pod
2381:
2382: =item * B<getById>(id):
2383:
2384: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2385: object for that resource. This method, or other methods that use it
2386: (as in the resource object) is the only proper way to obtain a
2387: resource object.
2388:
2389: =item * B<getBySymb>(symb):
2390:
2391: Based on the symb of the resource, get a resource object for that
2392: resource. This is one of the proper ways to get a resource object.
2393:
2394: =item * B<getMapByMapPc>(map_pc):
2395:
2396: Based on the map_pc of the resource, get a resource object for
2397: the given map. This is one of the proper ways to get a resource object.
2398:
2399: =cut
2400:
2401: # The strategy here is to cache the resource objects, and only construct them
2402: # as we use them. The real point is to prevent reading any more from the tied
2403: # hash then we have to, which should hopefully alleviate speed problems.
2404:
2405: sub getById {
2406: my $self = shift;
2407: my $id = shift;
2408:
2409: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2410: {
2411: return $self->{RESOURCE_CACHE}->{$id};
2412: }
2413:
2414: # resource handles inserting itself into cache.
2415: # Not clear why the quotes are necessary, but as of this
2416: # writing it doesn't work without them.
2417: return "Apache::lonnavmaps::resource"->new($self, $id);
2418: }
2419:
2420: sub getBySymb {
2421: my $self = shift;
2422: my $symb = shift;
2423:
2424: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2425: my $map = $self->getResourceByUrl($mapUrl);
2426: my $returnvalue = undef;
2427: if (ref($map)) {
2428: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2429: }
2430: return $returnvalue;
2431: }
2432:
2433: sub getByMapPc {
2434: my $self = shift;
2435: my $map_pc = shift;
2436: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2437: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2438: return $self->getById($map_id);
2439: }
2440:
2441: =pod
2442:
2443: =item * B<firstResource>():
2444:
2445: Returns a resource object reference corresponding to the first
2446: resource in the navmap.
2447:
2448: =cut
2449:
2450: sub firstResource {
2451: my $self = shift;
2452: my $firstResource = $self->navhash('map_start_' .
2453: &Apache::lonnet::clutter($env{'request.course.uri'}));
2454: return $self->getById($firstResource);
2455: }
2456:
2457: =pod
2458:
2459: =item * B<finishResource>():
2460:
2461: Returns a resource object reference corresponding to the last resource
2462: in the navmap.
2463:
2464: =cut
2465:
2466: sub finishResource {
2467: my $self = shift;
2468: my $firstResource = $self->navhash('map_finish_' .
2469: &Apache::lonnet::clutter($env{'request.course.uri'}));
2470: return $self->getById($firstResource);
2471: }
2472:
2473: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2474: # the actual lookup; parmval caches the results.
2475: sub parmval {
2476: my $self = shift;
2477: my ($what,$symb)=@_;
2478: my $hashkey = $what."|||".$symb;
2479:
2480: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2481: return $self->{PARM_CACHE}->{$hashkey};
2482: }
2483:
2484: my $result = $self->parmval_real($what, $symb);
2485: $self->{PARM_CACHE}->{$hashkey} = $result;
2486: return $result;
2487: }
2488:
2489: sub parmval_real {
2490: my $self = shift;
2491: my ($what,$symb,$recurse) = @_;
2492:
2493: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2494: $self->generate_course_user_opt();
2495:
2496: my $cid=$env{'request.course.id'};
2497: my $csec=$env{'request.course.sec'};
2498: my $uname=$env{'user.name'};
2499: my $udom=$env{'user.domain'};
2500:
2501: unless ($symb) { return ''; }
2502: my $result='';
2503:
2504: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2505:
2506: # ----------------------------------------------------- Cascading lookup scheme
2507: my $rwhat=$what;
2508: $what=~s/^parameter\_//;
2509: $what=~s/\_/\./;
2510:
2511: my $symbparm=$symb.'.'.$what;
2512: my $mapparm=$mapname.'___(all).'.$what;
2513: my $usercourseprefix=$cid;
2514:
2515: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2516: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2517: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2518:
2519: my $courselevel= $usercourseprefix.'.'.$what;
2520: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2521: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2522:
2523: my $useropt = $self->{USER_OPT};
2524: my $courseopt = $self->{COURSE_OPT};
2525: my $parmhash = $self->{PARM_HASH};
2526:
2527: # ---------------------------------------------------------- first, check user
2528: if ($uname and defined($useropt)) {
2529: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2530: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2531: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2532: }
2533:
2534: # ------------------------------------------------------- second, check course
2535: if ($csec and defined($courseopt)) {
2536: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2537: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2538: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2539: }
2540:
2541: if (defined($courseopt)) {
2542: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2543: }
2544:
2545: # ----------------------------------------------------- third, check map parms
2546:
2547: my $thisparm=$$parmhash{$symbparm};
2548: if (defined($thisparm)) { return $thisparm; }
2549:
2550: # ----------------------------------------------------- fourth , check default
2551:
2552: my $meta_rwhat=$rwhat;
2553: $meta_rwhat=~s/\./_/g;
2554: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2555: if (defined($default)) { return $default}
2556: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2557: if (defined($default)) { return $default}
2558:
2559: # --------------------------------------------------- fifth, check more course
2560: if (defined($courseopt)) {
2561: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2562: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2563: }
2564:
2565: # --------------------------------------------------- sixth , cascade up parts
2566:
2567: my ($space,@qualifier)=split(/\./,$rwhat);
2568: my $qualifier=join('.',@qualifier);
2569: unless ($space eq '0') {
2570: my @parts=split(/_/,$space);
2571: my $id=pop(@parts);
2572: my $part=join('_',@parts);
2573: if ($part eq '') { $part='0'; }
2574: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2575: if (defined($partgeneral)) { return $partgeneral; }
2576: }
2577: if ($recurse) { return undef; }
2578: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2579: if (defined($pack_def)) { return $pack_def; }
2580: return '';
2581: }
2582:
2583: =pod
2584:
2585: =item * B<getResourceByUrl>(url,multiple):
2586:
2587: Retrieves a resource object by URL of the resource, unless the optional
2588: multiple parameter is included in wahich caes an array of resource
2589: objects is returned. If passed a resource object, it will simply return
2590: it, so it is safe to use this method in code like
2591: "$res = $navmap->getResourceByUrl($res)"
2592: if you're not sure if $res is already an object, or just a URL. If the
2593: resource appears multiple times in the course, only the first instance
2594: will be returned (useful for maps), unless the multiple parameter has
2595: been included, in which case all instances are returned in an array.
2596:
2597: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2598:
2599: The map is a specification of a map to retreive the resources from,
2600: either as a url or as an object. The filterFunc is a reference to a
2601: function that takes a resource object as its one argument and returns
2602: true if the resource should be included, or false if it should not
2603: be. If recursive is true, the map will be recursively examined,
2604: otherwise it will not be. If bailout is true, the function will return
2605: as soon as it finds a resource, if false it will finish. If showall is
2606: true it will not hide maps that contain nothing but one other map. By
2607: default, the map is the top-level map of the course, filterFunc is a
2608: function that always returns 1, recursive is true, bailout is false,
2609: showall is false. The resources will be returned in a list containing
2610: the resource objects for the corresponding resources, with B<no
2611: structure information> in the list; regardless of branching,
2612: recursion, etc., it will be a flat list.
2613:
2614: Thus, this is suitable for cases where you don't want the structure,
2615: just a list of all resources. It is also suitable for finding out how
2616: many resources match a given description; for this use, if all you
2617: want to know is if I<any> resources match the description, the bailout
2618: parameter will allow you to avoid potentially expensive enumeration of
2619: all matching resources.
2620:
2621: =item * B<hasResource>(map, filterFunc, recursive, showall):
2622:
2623: Convience method for
2624:
2625: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2626:
2627: which will tell whether the map has resources matching the description
2628: in the filter function.
2629:
2630: =item * B<usedVersion>(url):
2631:
2632: Retrieves version infomation for a url. Returns the version (a number, or
2633: the string "mostrecent") for resources which have version information in
2634: the big hash.
2635:
2636: =cut
2637:
2638:
2639: sub getResourceByUrl {
2640: my $self = shift;
2641: my $resUrl = shift;
2642: my $multiple = shift;
2643:
2644: if (ref($resUrl)) { return $resUrl; }
2645:
2646: $resUrl = &Apache::lonnet::clutter($resUrl);
2647: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2648: if (!$resId) { return ''; }
2649: if ($multiple) {
2650: my @resources = ();
2651: my @resIds = split (/,/, $resId);
2652: foreach my $id (@resIds) {
2653: my $resourceId = $self->getById($id);
2654: if ($resourceId) {
2655: push(@resources,$resourceId);
2656: }
2657: }
2658: return @resources;
2659: } else {
2660: if ($resId =~ /,/) {
2661: $resId = (split (/,/, $resId))[0];
2662: }
2663: return $self->getById($resId);
2664: }
2665: }
2666:
2667: sub retrieveResources {
2668: my $self = shift;
2669: my $map = shift;
2670: my $filterFunc = shift;
2671: if (!defined ($filterFunc)) {
2672: $filterFunc = sub {return 1;};
2673: }
2674: my $recursive = shift;
2675: if (!defined($recursive)) { $recursive = 1; }
2676: my $bailout = shift;
2677: if (!defined($bailout)) { $bailout = 0; }
2678: my $showall = shift;
2679: # Create the necessary iterator.
2680: if (!ref($map)) { # assume it's a url of a map.
2681: $map = $self->getResourceByUrl($map);
2682: }
2683:
2684: # If nothing was passed, assume top-level map
2685: if (!$map) {
2686: $map = $self->getById('0.0');
2687: }
2688:
2689: # Check the map's validity.
2690: if (!$map->is_map()) {
2691: # Oh, to throw an exception.... how I'd love that!
2692: return ();
2693: }
2694:
2695: # Get an iterator.
2696: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2697: undef, $recursive, $showall);
2698:
2699: my @resources = ();
2700:
2701: # Run down the iterator and collect the resources.
2702: my $curRes;
2703:
2704: while ($curRes = $it->next()) {
2705: if (ref($curRes)) {
2706: if (!&$filterFunc($curRes)) {
2707: next;
2708: }
2709:
2710: push @resources, $curRes;
2711:
2712: if ($bailout) {
2713: return @resources;
2714: }
2715: }
2716:
2717: }
2718:
2719: return @resources;
2720: }
2721:
2722: sub hasResource {
2723: my $self = shift;
2724: my $map = shift;
2725: my $filterFunc = shift;
2726: my $recursive = shift;
2727: my $showall = shift;
2728:
2729: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2730: }
2731:
2732: sub usedVersion {
2733: my $self = shift;
2734: my $linkurl = shift;
2735: return $self->navhash("version_$linkurl");
2736: }
2737:
2738: 1;
2739:
2740: package Apache::lonnavmaps::iterator;
2741: use WeakRef;
2742: use Apache::lonnet;
2743:
2744: =pod
2745:
2746: =back
2747:
2748: =head1 Object: navmap Iterator
2749:
2750: An I<iterator> encapsulates the logic required to traverse a data
2751: structure. navmap uses an iterator to traverse the course map
2752: according to the criteria you wish to use.
2753:
2754: To obtain an iterator, call the B<getIterator>() function of a
2755: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2756: directly.) This will return a reference to the iterator:
2757:
2758: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2759:
2760: To get the next thing from the iterator, call B<next>:
2761:
2762: C<my $nextThing = $resourceIterator-E<gt>next()>
2763:
2764: getIterator behaves as follows:
2765:
2766: =over 4
2767:
2768: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2769:
2770: All parameters are optional. firstResource is a resource reference
2771: corresponding to where the iterator should start. It defaults to
2772: navmap->firstResource() for the corresponding nav map. finishResource
2773: corresponds to where you want the iterator to end, defaulting to
2774: navmap->finishResource(). filterHash is a hash used as a set
2775: containing strings representing the resource IDs, defaulting to
2776: empty. Condition is a 1 or 0 that sets what to do with the filter
2777: hash: If a 0, then only resources that exist IN the filterHash will be
2778: recursed on. If it is a 1, only resources NOT in the filterHash will
2779: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2780: false (default), the iterator will only return the first level of map
2781: that is not just a single, 'redirecting' map. If true, the iterator
2782: will return all information, starting with the top-level map,
2783: regardless of content. returnTopMap, if true (default false), will
2784: cause the iterator to return the top-level map object (resource 0.0)
2785: before anything else.
2786:
2787: Thus, by default, only top-level resources will be shown. Change the
2788: condition to a 1 without changing the hash, and all resources will be
2789: shown. Changing the condition to 1 and including some values in the
2790: hash will allow you to selectively suppress parts of the navmap, while
2791: leaving it on 0 and adding things to the hash will allow you to
2792: selectively add parts of the nav map. See the handler code for
2793: examples.
2794:
2795: The iterator will return either a reference to a resource object, or a
2796: token representing something in the map, such as the beginning of a
2797: new branch. The possible tokens are:
2798:
2799: =over 4
2800:
2801: =item * B<END_ITERATOR>:
2802:
2803: The iterator has returned all that it's going to. Further calls to the
2804: iterator will just produce more of these. This is a "false" value, and
2805: is the only false value the iterator which will be returned, so it can
2806: be used as a loop sentinel.
2807:
2808: =item * B<BEGIN_MAP>:
2809:
2810: A new map is being recursed into. This is returned I<after> the map
2811: resource itself is returned.
2812:
2813: =item * B<END_MAP>:
2814:
2815: The map is now done.
2816:
2817: =item * B<BEGIN_BRANCH>:
2818:
2819: A branch is now starting. The next resource returned will be the first
2820: in that branch.
2821:
2822: =item * B<END_BRANCH>:
2823:
2824: The branch is now done.
2825:
2826: =back
2827:
2828: The tokens are retreivable via methods on the iterator object, i.e.,
2829: $iterator->END_MAP.
2830:
2831: Maps can contain empty resources. The iterator will automatically skip
2832: over such resources, but will still treat the structure
2833: correctly. Thus, a complicated map with several branches, but
2834: consisting entirely of empty resources except for one beginning or
2835: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2836: but only one resource will be returned.
2837:
2838: =back
2839:
2840: =head2 Normal Usage
2841:
2842: Normal usage of the iterator object is to do the following:
2843:
2844: my $it = $navmap->getIterator([your params here]);
2845: my $curRes;
2846: while ($curRes = $it->next()) {
2847: [your logic here]
2848: }
2849:
2850: Note that inside of the loop, it's frequently useful to check if
2851: "$curRes" is a reference or not with the reference function; only
2852: resource objects will be references, and any non-references will
2853: be the tokens described above.
2854:
2855: Also note there is some old code floating around that trys to track
2856: the depth of the iterator to see when it's done; do not copy that
2857: code. It is difficult to get right and harder to understand then
2858: this. They should be migrated to this new style.
2859:
2860: =cut
2861:
2862: # Here are the tokens for the iterator:
2863:
2864: sub END_ITERATOR { return 0; }
2865: sub BEGIN_MAP { return 1; } # begining of a new map
2866: sub END_MAP { return 2; } # end of the map
2867: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2868: sub END_BRANCH { return 4; } # end of a branch
2869: sub FORWARD { return 1; } # go forward
2870: sub BACKWARD { return 2; }
2871:
2872: sub min {
2873: (my $a, my $b) = @_;
2874: if ($a < $b) { return $a; } else { return $b; }
2875: }
2876:
2877: sub new {
2878: # magic invocation to create a class instance
2879: my $proto = shift;
2880: my $class = ref($proto) || $proto;
2881: my $self = {};
2882:
2883: weaken($self->{NAV_MAP} = shift);
2884: return undef unless ($self->{NAV_MAP});
2885:
2886: # Handle the parameters
2887: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2888: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2889:
2890: # If the given resources are just the ID of the resource, get the
2891: # objects
2892: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2893: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2894: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2895: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2896:
2897: $self->{FILTER} = shift;
2898:
2899: # A hash, used as a set, of resource already seen
2900: $self->{ALREADY_SEEN} = shift;
2901: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2902: $self->{CONDITION} = shift;
2903:
2904: # Do we want to automatically follow "redirection" maps?
2905: $self->{FORCE_TOP} = shift;
2906:
2907: # Do we want to return the top-level map object (resource 0.0)?
2908: $self->{RETURN_0} = shift;
2909: # have we done that yet?
2910: $self->{HAVE_RETURNED_0} = 0;
2911:
2912: # Now, we need to pre-process the map, by walking forward and backward
2913: # over the parts of the map we're going to look at.
2914:
2915: # The processing steps are exactly the same, except for a few small
2916: # changes, so I bundle those up in the following list of two elements:
2917: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2918: # first_resource).
2919: # This prevents writing nearly-identical code twice.
2920: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2921: 'FIRST_RESOURCE'],
2922: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2923: 'FINISH_RESOURCE'] );
2924:
2925: my $maxDepth = 0; # tracks max depth
2926:
2927: # If there is only one resource in this map, and it's a map, we
2928: # want to remember that, so the user can ask for the first map
2929: # that isn't just a redirector.
2930: my $resource; my $resourceCount = 0;
2931:
2932: # Documentation on this algorithm can be found in the CVS repository at
2933: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2934: # in that file.
2935: # **1**
2936:
2937: foreach my $pass (@iterations) {
2938: my $direction = $pass->[0];
2939: my $valName = $pass->[1];
2940: my $nextResourceMethod = $pass->[2];
2941: my $firstResourceName = $pass->[3];
2942:
2943: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2944: $self->{FIRST_RESOURCE},
2945: $self->{FINISH_RESOURCE},
2946: {}, undef, 0, $direction);
2947:
2948: # prime the recursion
2949: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2950: $iterator->next();
2951: my $curRes = $iterator->next();
2952: my $depth = 1;
2953: while ($depth > 0) {
2954: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2955: if ($curRes == $iterator->END_MAP()) { $depth--; }
2956:
2957: if (ref($curRes)) {
2958: # If there's only one resource, this will save it
2959: # we have to filter empty resources from consideration here,
2960: # or even "empty", redirecting maps have two (start & finish)
2961: # or three (start, finish, plus redirector)
2962: if($direction == FORWARD && $curRes->src()) {
2963: $resource = $curRes; $resourceCount++;
2964: }
2965: my $resultingVal = $curRes->{DATA}->{$valName};
2966: my $nextResources = $curRes->$nextResourceMethod();
2967: my $nextCount = scalar(@{$nextResources});
2968:
2969: if ($nextCount == 1) { # **3**
2970: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2971: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2972: }
2973:
2974: if ($nextCount > 1) { # **4**
2975: foreach my $res (@{$nextResources}) {
2976: my $current = $res->{DATA}->{$valName} || 999999999;
2977: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2978: }
2979: }
2980: }
2981:
2982: # Assign the final val (**2**)
2983: if (ref($curRes) && $direction == BACKWARD()) {
2984: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2985: $curRes->{DATA}->{BOT_UP_VAL});
2986:
2987: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2988: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2989: }
2990:
2991: $curRes = $iterator->next();
2992: }
2993: }
2994:
2995: # Check: Was this only one resource, a map?
2996: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2997: my $firstResource = $resource->map_start();
2998: my $finishResource = $resource->map_finish();
2999: return
3000: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3001: $finishResource, $self->{FILTER},
3002: $self->{ALREADY_SEEN},
3003: $self->{CONDITION},
3004: $self->{FORCE_TOP});
3005:
3006: }
3007:
3008: # Set up some bookkeeping information.
3009: $self->{CURRENT_DEPTH} = 0;
3010: $self->{MAX_DEPTH} = $maxDepth;
3011: $self->{STACK} = [];
3012: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3013: $self->{FINISHED} = 0; # When true, the iterator has finished
3014:
3015: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3016: push @{$self->{STACK}}, [];
3017: }
3018:
3019: # Prime the recursion w/ the first resource **5**
3020: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3021: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3022:
3023: bless ($self);
3024:
3025: return $self;
3026: }
3027:
3028: sub next {
3029: my $self = shift;
3030: my $closeAllPages=shift;
3031: if ($self->{FINISHED}) {
3032: return END_ITERATOR();
3033: }
3034:
3035: # If we want to return the top-level map object, and haven't yet,
3036: # do so.
3037: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3038: $self->{HAVE_RETURNED_0} = 1;
3039: return $self->{NAV_MAP}->getById('0.0');
3040: }
3041:
3042: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3043: # grab the next from the recursive iterator
3044: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3045:
3046: # is it a begin or end map? If so, update the depth
3047: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3048: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3049:
3050: # Are we back at depth 0? If so, stop recursing
3051: if ($self->{RECURSIVE_DEPTH} == 0) {
3052: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3053: }
3054:
3055: return $next;
3056: }
3057:
3058: if (defined($self->{FORCE_NEXT})) {
3059: my $tmp = $self->{FORCE_NEXT};
3060: $self->{FORCE_NEXT} = undef;
3061: return $tmp;
3062: }
3063:
3064: # Have we not yet begun? If not, return BEGIN_MAP and
3065: # remember we've started.
3066: if ( !$self->{STARTED} ) {
3067: $self->{STARTED} = 1;
3068: return $self->BEGIN_MAP();
3069: }
3070:
3071: # Here's the guts of the iterator.
3072:
3073: # Find the next resource, if any.
3074: my $found = 0;
3075: my $i = $self->{MAX_DEPTH};
3076: my $newDepth;
3077: my $here;
3078: while ( $i >= 0 && !$found ) {
3079: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3080: $here = pop @{$self->{STACK}->[$i]}; # **7**
3081: $found = 1;
3082: $newDepth = $i;
3083: }
3084: $i--;
3085: }
3086:
3087: # If we still didn't find anything, we're done.
3088: if ( !$found ) {
3089: # We need to get back down to the correct branch depth
3090: if ( $self->{CURRENT_DEPTH} > 0 ) {
3091: $self->{CURRENT_DEPTH}--;
3092: return END_BRANCH();
3093: } else {
3094: $self->{FINISHED} = 1;
3095: return END_MAP();
3096: }
3097: }
3098:
3099: # If this is not a resource, it must be an END_BRANCH marker we want
3100: # to return directly.
3101: if (!ref($here)) { # **8**
3102: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3103: $self->{CURRENT_DEPTH}--;
3104: return $here;
3105: }
3106: }
3107:
3108: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3109: $self->{HERE} = $here;
3110:
3111: # Get to the right level
3112: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3113: push @{$self->{STACK}->[$newDepth]}, $here;
3114: $self->{CURRENT_DEPTH}--;
3115: return END_BRANCH();
3116: }
3117: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3118: push @{$self->{STACK}->[$newDepth]}, $here;
3119: $self->{CURRENT_DEPTH}++;
3120: return BEGIN_BRANCH();
3121: }
3122:
3123: # If we made it here, we have the next resource, and we're at the
3124: # right branch level. So let's examine the resource for where
3125: # we can get to from here.
3126:
3127: # So we need to look at all the resources we can get to from here,
3128: # categorize them if we haven't seen them, remember if we have a new
3129: my $nextUnfiltered = $here->getNext();
3130: my $maxDepthAdded = -1;
3131:
3132: for (@$nextUnfiltered) {
3133: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3134: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3135: push @{$self->{STACK}->[$depth]}, $_;
3136: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3137: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3138: }
3139: }
3140:
3141: # Is this the end of a branch? If so, all of the resources examined above
3142: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3143: # marker onto the stack so we don't forget.
3144: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3145: # BC branch and gets to C, it will see F as the only next resource, but it's
3146: # one level lower. Thus, this is the end of the branch, since there are no
3147: # more resources added to this level or above.
3148: # We don't do this if the examined resource is the finish resource,
3149: # because the condition given above is true, but the "END_MAP" will
3150: # take care of things and we should already be at depth 0.
3151: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3152: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3153: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3154: }
3155:
3156: # That ends the main iterator logic. Now, do we want to recurse
3157: # down this map (if this resource is a map)?
3158: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3159: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3160: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3161: my $firstResource = $self->{HERE}->map_start();
3162: my $finishResource = $self->{HERE}->map_finish();
3163:
3164: $self->{RECURSIVE_ITERATOR} =
3165: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3166: $finishResource, $self->{FILTER},
3167: $self->{ALREADY_SEEN},
3168: $self->{CONDITION},
3169: $self->{FORCE_TOP});
3170: }
3171:
3172: # If this is a blank resource, don't actually return it.
3173: # Should you ever find you need it, make sure to add an option to the code
3174: # that you can use; other things depend on this behavior.
3175: my $browsePriv = $self->{HERE}->browsePriv();
3176: if (!$self->{HERE}->src() ||
3177: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3178: return $self->next($closeAllPages);
3179: }
3180:
3181: return $self->{HERE};
3182:
3183: }
3184:
3185: =pod
3186:
3187: The other method available on the iterator is B<getStack>, which
3188: returns an array populated with the current 'stack' of maps, as
3189: references to the resource objects. Example: This is useful when
3190: making the navigation map, as we need to check whether we are under a
3191: page map to see if we need to link directly to the resource, or to the
3192: page. The first elements in the array will correspond to the top of
3193: the stack (most inclusive map).
3194:
3195: =cut
3196:
3197: sub getStack {
3198: my $self=shift;
3199:
3200: my @stack;
3201:
3202: $self->populateStack(\@stack);
3203:
3204: return \@stack;
3205: }
3206:
3207: # Private method: Calls the iterators recursively to populate the stack.
3208: sub populateStack {
3209: my $self=shift;
3210: my $stack = shift;
3211:
3212: push @$stack, $self->{HERE} if ($self->{HERE});
3213:
3214: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3215: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3216: }
3217: }
3218:
3219: 1;
3220:
3221: package Apache::lonnavmaps::DFSiterator;
3222: use WeakRef;
3223: use Apache::lonnet;
3224:
3225: # Not documented in the perldoc: This is a simple iterator that just walks
3226: # through the nav map and presents the resources in a depth-first search
3227: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3228: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3229: # useful for pre-processing of some kind, and is in fact used by the main
3230: # iterator that way, but that's about it.
3231: # One could imagine merging this into the init routine of the main iterator,
3232: # but this might as well be left separate, since it is possible some other
3233: # use might be found for it. - Jeremy
3234:
3235: # Unlike the main iterator, this DOES return all resources, even blank ones.
3236: # The main iterator needs them to correctly preprocess the map.
3237:
3238: sub BEGIN_MAP { return 1; } # begining of a new map
3239: sub END_MAP { return 2; } # end of the map
3240: sub FORWARD { return 1; } # go forward
3241: sub BACKWARD { return 2; }
3242:
3243: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3244: # filter hash ref (or undef), already seen hash or undef, condition
3245: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3246: sub new {
3247: # magic invocation to create a class instance
3248: my $proto = shift;
3249: my $class = ref($proto) || $proto;
3250: my $self = {};
3251:
3252: weaken($self->{NAV_MAP} = shift);
3253: return undef unless ($self->{NAV_MAP});
3254:
3255: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3256: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3257:
3258: # If the given resources are just the ID of the resource, get the
3259: # objects
3260: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3261: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3262: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3263: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3264:
3265: $self->{FILTER} = shift;
3266:
3267: # A hash, used as a set, of resource already seen
3268: $self->{ALREADY_SEEN} = shift;
3269: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3270: $self->{CONDITION} = shift;
3271: $self->{DIRECTION} = shift || FORWARD();
3272:
3273: # Flag: Have we started yet?
3274: $self->{STARTED} = 0;
3275:
3276: # Should we continue calling the recursive iterator, if any?
3277: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3278: # The recursive iterator, if any
3279: $self->{RECURSIVE_ITERATOR} = undef;
3280: # Are we recursing on a map, or a branch?
3281: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3282: # And the count of how deep it is, so that this iterator can keep track of
3283: # when to pick back up again.
3284: $self->{RECURSIVE_DEPTH} = 0;
3285:
3286: # For keeping track of our branches, we maintain our own stack
3287: $self->{STACK} = [];
3288:
3289: # Start with the first resource
3290: if ($self->{DIRECTION} == FORWARD) {
3291: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3292: } else {
3293: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3294: }
3295:
3296: bless($self);
3297: return $self;
3298: }
3299:
3300: sub next {
3301: my $self = shift;
3302:
3303: # Are we using a recursive iterator? If so, pull from that and
3304: # watch the depth; we want to resume our level at the correct time.
3305: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3306: # grab the next from the recursive iterator
3307: my $next = $self->{RECURSIVE_ITERATOR}->next();
3308:
3309: # is it a begin or end map? Update depth if so
3310: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3311: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3312:
3313: # Are we back at depth 0? If so, stop recursing.
3314: if ($self->{RECURSIVE_DEPTH} == 0) {
3315: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3316: }
3317:
3318: return $next;
3319: }
3320:
3321: # Is there a current resource to grab? If not, then return
3322: # END_MAP, which will end the iterator.
3323: if (scalar(@{$self->{STACK}}) == 0) {
3324: return $self->END_MAP();
3325: }
3326:
3327: # Have we not yet begun? If not, return BEGIN_MAP and
3328: # remember that we've started.
3329: if ( !$self->{STARTED} ) {
3330: $self->{STARTED} = 1;
3331: return $self->BEGIN_MAP;
3332: }
3333:
3334: # Get the next resource in the branch
3335: $self->{HERE} = pop @{$self->{STACK}};
3336:
3337: # remember that we've seen this, so we don't return it again later
3338: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3339:
3340: # Get the next possible resources
3341: my $nextUnfiltered;
3342: if ($self->{DIRECTION} == FORWARD()) {
3343: $nextUnfiltered = $self->{HERE}->getNext();
3344: } else {
3345: $nextUnfiltered = $self->{HERE}->getPrevious();
3346: }
3347: my $next = [];
3348:
3349: # filter the next possibilities to remove things we've
3350: # already seen.
3351: foreach (@$nextUnfiltered) {
3352: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3353: push @$next, $_;
3354: }
3355: }
3356:
3357: while (@$next) {
3358: # copy the next possibilities over to the stack
3359: push @{$self->{STACK}}, shift @$next;
3360: }
3361:
3362: # If this is a map and we want to recurse down it... (not filtered out)
3363: if ($self->{HERE}->is_map() &&
3364: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3365: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3366: my $firstResource = $self->{HERE}->map_start();
3367: my $finishResource = $self->{HERE}->map_finish();
3368:
3369: $self->{RECURSIVE_ITERATOR} =
3370: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3371: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3372: $self->{CONDITION}, $self->{DIRECTION});
3373: }
3374:
3375: return $self->{HERE};
3376: }
3377:
3378: # Identical to the full iterator methods of the same name. Hate to copy/paste
3379: # but I also hate to "inherit" either iterator from the other.
3380:
3381: sub getStack {
3382: my $self=shift;
3383:
3384: my @stack;
3385:
3386: $self->populateStack(\@stack);
3387:
3388: return \@stack;
3389: }
3390:
3391: # Private method: Calls the iterators recursively to populate the stack.
3392: sub populateStack {
3393: my $self=shift;
3394: my $stack = shift;
3395:
3396: push @$stack, $self->{HERE} if ($self->{HERE});
3397:
3398: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3399: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3400: }
3401: }
3402:
3403: 1;
3404:
3405: package Apache::lonnavmaps::resource;
3406: use WeakRef;
3407: use Apache::lonnet;
3408:
3409: =pod
3410:
3411: =head1 Object: resource
3412:
3413: X<resource, navmap object>
3414: A resource object encapsulates a resource in a resource map, allowing
3415: easy manipulation of the resource, querying the properties of the
3416: resource (including user properties), and represents a reference that
3417: can be used as the canonical representation of the resource by
3418: lonnavmap clients like renderers.
3419:
3420: A resource only makes sense in the context of a navmap, as some of the
3421: data is stored in the navmap object.
3422:
3423: You will probably never need to instantiate this object directly. Use
3424: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3425: starting resource.
3426:
3427: Resource objects respect the parameter_hiddenparts, which suppresses
3428: various parts according to the wishes of the map author. As of this
3429: writing, there is no way to override this parameter, and suppressed
3430: parts will never be returned, nor will their response types or ids be
3431: stored.
3432:
3433: =head2 Overview
3434:
3435: A B<Resource> is the most granular type of object in LON-CAPA that can
3436: be included in a course. It can either be a particular resource, like
3437: an HTML page, external resource, problem, etc., or it can be a
3438: container sequence, such as a "page" or a "map".
3439:
3440: To see a sequence from the user's point of view, please see the
3441: B<Creating a Course: Maps and Sequences> chapter of the Author's
3442: Manual.
3443:
3444: A Resource Object, once obtained from a navmap object via a B<getBy*>
3445: method of the navmap, or from an iterator, allows you to query
3446: information about that resource.
3447:
3448: Generally, you do not ever want to create a resource object yourself,
3449: so creation has been left undocumented. Always retrieve resources
3450: from navmap objects.
3451:
3452: =head3 Identifying Resources
3453:
3454: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3455: unique to that resource for a given course. X<resource ID, in big hash>
3456: The Resource ID has the form #.#, where the first number is the same
3457: for every resource in a map, and the second is unique. For instance,
3458: for a course laid out like this:
3459:
3460: * Problem 1
3461: * Map
3462: * Resource 2
3463: * Resource 3
3464:
3465: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3466: C<Resource 3> will share a first number. The second number may end up
3467: re-used between the two groups.
3468:
3469: The resource ID is only used in the big hash, but can be used in the
3470: context of a course to identify a resource easily. (For instance, the
3471: printing system uses it to record which resources from a sequence you
3472: wish to print.)
3473:
3474: X<symb> X<resource, symb>
3475: All resources also have B<symb>s, which uniquely identify a resource
3476: in a course. Many internal LON-CAPA functions expect a symb. A symb
3477: carries along with it the URL of the resource, and the map it appears
3478: in. Symbs are much larger then resource IDs.
3479:
3480: =cut
3481:
3482: sub new {
3483: # magic invocation to create a class instance
3484: my $proto = shift;
3485: my $class = ref($proto) || $proto;
3486: my $self = {};
3487:
3488: weaken($self->{NAV_MAP} = shift);
3489: $self->{ID} = shift;
3490:
3491: # Store this new resource in the parent nav map's cache.
3492: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3493: $self->{RESOURCE_ERROR} = 0;
3494:
3495: # A hash that can be used by two-pass algorithms to store data
3496: # about this resource in. Not used by the resource object
3497: # directly.
3498: $self->{DATA} = {};
3499:
3500: bless($self);
3501:
3502: return $self;
3503: }
3504:
3505: # private function: simplify the NAV_HASH lookups we keep doing
3506: # pass the name, and to automatically append my ID, pass a true val on the
3507: # second param
3508: sub navHash {
3509: my $self = shift;
3510: my $param = shift;
3511: my $id = shift;
3512: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3513: }
3514:
3515: =pod
3516:
3517: =head2 Methods
3518:
3519: Once you have a resource object, here's what you can do with it:
3520:
3521: =head3 Attribute Retrieval
3522:
3523: Every resource has certain attributes that can be retrieved and used:
3524:
3525: =over 4
3526:
3527: =item * B<ID>: Every resource has an ID that is unique for that
3528: resource in the course it is in. The ID is actually in the hash
3529: representing the resource, so for a resource object $res, obtain
3530: it via C<$res->{ID}).
3531:
3532: =item * B<compTitle>:
3533:
3534: Returns a "composite title", that is equal to $res->title() if the
3535: resource has a title, and is otherwise the last part of the URL (e.g.,
3536: "problem.problem").
3537:
3538: =item * B<ext>:
3539:
3540: Returns true if the resource is external.
3541:
3542: =item * B<kind>:
3543:
3544: Returns the kind of the resource from the compiled nav map.
3545:
3546: =item * B<randomout>:
3547:
3548: Returns true if this resource was chosen to NOT be shown to the user
3549: by the random map selection feature. In other words, this is usually
3550: false.
3551:
3552: =item * B<randompick>:
3553:
3554: Returns true for a map if the randompick feature is being used on the
3555: map. (?)
3556:
3557: =item * B<src>:
3558:
3559: Returns the source for the resource.
3560:
3561: =item * B<symb>:
3562:
3563: Returns the symb for the resource.
3564:
3565: =item * B<title>:
3566:
3567: Returns the title of the resource.
3568:
3569: =back
3570:
3571: =cut
3572:
3573: # These info functions can be used directly, as they don't return
3574: # resource information.
3575: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3576: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3577: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3578: sub from { my $self=shift; return $self->navHash("from_", 1); }
3579: # considered private and undocumented
3580: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3581: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3582: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3583: sub randompick {
3584: my $self = shift;
3585: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3586: '.0.parameter_randompick'};
3587: }
3588: sub link {
3589: my $self=shift;
3590: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3591: return $self->src;
3592: }
3593: sub src {
3594: my $self=shift;
3595: return $self->navHash("src_", 1);
3596: }
3597: sub shown_symb {
3598: my $self=shift;
3599: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3600: return $self->symb();
3601: }
3602: sub id {
3603: my $self=shift;
3604: return $self->{ID};
3605: }
3606: sub enclosing_map_src {
3607: my $self=shift;
3608: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3609: return $self->navHash('map_id_'.$first);
3610: }
3611: sub symb {
3612: my $self=shift;
3613: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3614: my $symbSrc = &Apache::lonnet::declutter($self->src());
3615: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3616: . '___' . $second . '___' . $symbSrc;
3617: return &Apache::lonnet::symbclean($symb);
3618: }
3619: sub wrap_symb {
3620: my $self = shift;
3621: return $self->{NAV_MAP}->wrap_symb($self->symb());
3622: }
3623: sub title {
3624: my $self=shift;
3625: if ($self->{ID} eq '0.0') {
3626: # If this is the top-level map, return the title of the course
3627: # since this map can not be titled otherwise.
3628: return $env{'course.'.$env{'request.course.id'}.'.description'};
3629: }
3630: return $self->navHash("title_", 1); }
3631: # considered private and undocumented
3632: sub to { my $self=shift; return $self->navHash("to_", 1); }
3633: sub condition {
3634: my $self=shift;
3635: my $undercond=$self->navHash("undercond_", 1);
3636: if (!defined($undercond)) { return 1; };
3637: my $condid=$self->navHash("condid_$undercond");
3638: if (!defined($condid)) { return 1; };
3639: my $condition=&Apache::lonnet::directcondval($condid);
3640: return $condition;
3641: }
3642: sub condval {
3643: my $self=shift;
3644: my $uri=&Apache::lonnet::deversion(&Apache::lonnet::declutter($self->src()));
3645: my ($pathname,$filename)=($uri=~m|(.*)/([^/]*)|);
3646: $pathname=~s/^adm\/wrapper\///;
3647:
3648: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3649: /\&\Q$filename\E\:([\d\|]+)\&/);
3650: if ($match) {
3651: return &Apache::lonnet::condval($1);
3652: }
3653: return 0;
3654: }
3655: sub compTitle {
3656: my $self = shift;
3657: my $title = $self->title();
3658: $title=~s/\&colon\;/\:/gs;
3659: if (!$title) {
3660: $title = $self->src();
3661: $title = substr($title, rindex($title, '/') + 1);
3662: }
3663: return $title;
3664: }
3665: =pod
3666:
3667: B<Predicate Testing the Resource>
3668:
3669: These methods are shortcuts to deciding if a given resource has a given property.
3670:
3671: =over 4
3672:
3673: =item * B<is_map>:
3674:
3675: Returns true if the resource is a map type.
3676:
3677: =item * B<is_problem>:
3678:
3679: Returns true if the resource is a problem type, false
3680: otherwise. (Looks at the extension on the src field; might need more
3681: to work correctly.)
3682:
3683: =item * B<is_page>:
3684:
3685: Returns true if the resource is a page.
3686:
3687: =item * B<is_sequence>:
3688:
3689: Returns true if the resource is a sequence.
3690:
3691: =back
3692:
3693: =cut
3694:
3695: sub hasResource {
3696: my $self = shift;
3697: return $self->{NAV_MAP}->hasResource(@_);
3698: }
3699:
3700: sub retrieveResources {
3701: my $self = shift;
3702: return $self->{NAV_MAP}->retrieveResources(@_);
3703: }
3704:
3705: sub is_html {
3706: my $self=shift;
3707: my $src = $self->src();
3708: return ($src =~ /html$/);
3709: }
3710: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3711: sub is_page {
3712: my $self=shift;
3713: my $src = $self->src();
3714: return $self->navHash("is_map_", 1) &&
3715: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3716: }
3717: sub is_problem {
3718: my $self=shift;
3719: my $src = $self->src();
3720: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/)
3721: }
3722: sub contains_problem {
3723: my $self=shift;
3724: if ($self->is_page()) {
3725: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3726: return $hasProblem;
3727: }
3728: return 0;
3729: }
3730: sub is_sequence {
3731: my $self=shift;
3732: my $src = $self->src();
3733: return $self->navHash("is_map_", 1) &&
3734: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3735: }
3736: sub is_survey {
3737: my $self = shift();
3738: my $part = shift();
3739: if ($self->parmval('type',$part) eq 'survey') {
3740: return 1;
3741: }
3742: if ($self->src() =~ /\.(survey)$/) {
3743: return 1;
3744: }
3745: return 0;
3746: }
3747:
3748: sub is_empty_sequence {
3749: my $self=shift;
3750: my $src = $self->src();
3751: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3752: }
3753:
3754: # Private method: Shells out to the parmval in the nav map, handler parts.
3755: sub parmval {
3756: my $self = shift;
3757: my $what = shift;
3758: my $part = shift;
3759: if (!defined($part)) {
3760: $part = '0';
3761: }
3762: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3763: }
3764:
3765: =pod
3766:
3767: B<Map Methods>
3768:
3769: These methods are useful for getting information about the map
3770: properties of the resource, if the resource is a map (B<is_map>).
3771:
3772: =over 4
3773:
3774: =item * B<map_finish>:
3775:
3776: Returns a reference to a resource object corresponding to the finish
3777: resource of the map.
3778:
3779: =item * B<map_pc>:
3780:
3781: Returns the pc value of the map, which is the first number that
3782: appears in the resource ID of the resources in the map, and is the
3783: number that appears around the middle of the symbs of the resources in
3784: that map.
3785:
3786: =item * B<map_start>:
3787:
3788: Returns a reference to a resource object corresponding to the start
3789: resource of the map.
3790:
3791: =item * B<map_type>:
3792:
3793: Returns a string with the type of the map in it.
3794:
3795: =back
3796:
3797: =cut
3798:
3799: sub map_finish {
3800: my $self = shift;
3801: my $src = $self->src();
3802: $src = Apache::lonnet::clutter($src);
3803: my $res = $self->navHash("map_finish_$src", 0);
3804: $res = $self->{NAV_MAP}->getById($res);
3805: return $res;
3806: }
3807: sub map_pc {
3808: my $self = shift;
3809: my $src = $self->src();
3810: return $self->navHash("map_pc_$src", 0);
3811: }
3812: sub map_start {
3813: my $self = shift;
3814: my $src = $self->src();
3815: $src = Apache::lonnet::clutter($src);
3816: my $res = $self->navHash("map_start_$src", 0);
3817: $res = $self->{NAV_MAP}->getById($res);
3818: return $res;
3819: }
3820: sub map_type {
3821: my $self = shift;
3822: my $pc = $self->map_pc();
3823: return $self->navHash("map_type_$pc", 0);
3824: }
3825:
3826: #####
3827: # Property queries
3828: #####
3829:
3830: # These functions will be responsible for returning the CORRECT
3831: # VALUE for the parameter, no matter what. So while they may look
3832: # like direct calls to parmval, they can be more then that.
3833: # So, for instance, the duedate function should use the "duedatetype"
3834: # information, rather then the resource object user.
3835:
3836: =pod
3837:
3838: =head2 Resource Parameters
3839:
3840: In order to use the resource parameters correctly, the nav map must
3841: have been instantiated with genCourseAndUserOptions set to true, so
3842: the courseopt and useropt is read correctly. Then, you can call these
3843: functions to get the relevant parameters for the resource. Each
3844: function defaults to part "0", but can be directed to another part by
3845: passing the part as the parameter.
3846:
3847: These methods are responsible for getting the parameter correct, not
3848: merely reflecting the contents of the GDBM hashes. As we move towards
3849: dates relative to other dates, these methods should be updated to
3850: reflect that. (Then, anybody using these methods will not have to update
3851: their code.)
3852:
3853: =over 4
3854:
3855: =item * B<acc>:
3856:
3857: Get the Client IP/Name Access Control information.
3858:
3859: =item * B<answerdate>:
3860:
3861: Get the answer-reveal date for the problem.
3862:
3863: =item * B<awarded>:
3864:
3865: Gets the awarded value for the problem part. Requires genUserData set to
3866: true when the navmap object was created.
3867:
3868: =item * B<duedate>:
3869:
3870: Get the due date for the problem.
3871:
3872: =item * B<tries>:
3873:
3874: Get the number of tries the student has used on the problem.
3875:
3876: =item * B<maxtries>:
3877:
3878: Get the number of max tries allowed.
3879:
3880: =item * B<opendate>:
3881:
3882: Get the open date for the problem.
3883:
3884: =item * B<sig>:
3885:
3886: Get the significant figures setting.
3887:
3888: =item * B<tol>:
3889:
3890: Get the tolerance for the problem.
3891:
3892: =item * B<tries>:
3893:
3894: Get the number of tries the user has already used on the problem.
3895:
3896: =item * B<type>:
3897:
3898: Get the question type for the problem.
3899:
3900: =item * B<weight>:
3901:
3902: Get the weight for the problem.
3903:
3904: =back
3905:
3906: =cut
3907:
3908: sub acc {
3909: (my $self, my $part) = @_;
3910: return $self->parmval("acc", $part);
3911: }
3912: sub answerdate {
3913: (my $self, my $part) = @_;
3914: # Handle intervals
3915: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3916: return $self->duedate($part) +
3917: $self->parmval("answerdate", $part);
3918: }
3919: return $self->parmval("answerdate", $part);
3920: }
3921: sub awarded {
3922: my $self = shift; my $part = shift;
3923: $self->{NAV_MAP}->get_user_data();
3924: if (!defined($part)) { $part = '0'; }
3925: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3926: }
3927: sub duedate {
3928: (my $self, my $part) = @_;
3929: my $interval=$self->parmval("interval", $part);
3930: if ($interval) {
3931: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3932: if ($first_access) { return ($first_access+$interval); }
3933: }
3934: return $self->parmval("duedate", $part);
3935: }
3936: sub handgrade {
3937: (my $self, my $part) = @_;
3938: return $self->parmval("handgrade", $part);
3939: }
3940: sub maxtries {
3941: (my $self, my $part) = @_;
3942: return $self->parmval("maxtries", $part);
3943: }
3944: sub opendate {
3945: (my $self, my $part) = @_;
3946: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3947: return $self->duedate($part) -
3948: $self->parmval("opendate", $part);
3949: }
3950: return $self->parmval("opendate");
3951: }
3952: sub problemstatus {
3953: (my $self, my $part) = @_;
3954: return lc $self->parmval("problemstatus", $part);
3955: }
3956: sub sig {
3957: (my $self, my $part) = @_;
3958: return $self->parmval("sig", $part);
3959: }
3960: sub tol {
3961: (my $self, my $part) = @_;
3962: return $self->parmval("tol", $part);
3963: }
3964: sub tries {
3965: my $self = shift;
3966: my $tries = $self->queryRestoreHash('tries', shift);
3967: if (!defined($tries)) { return '0';}
3968: return $tries;
3969: }
3970: sub type {
3971: (my $self, my $part) = @_;
3972: return $self->parmval("type", $part);
3973: }
3974: sub weight {
3975: my $self = shift; my $part = shift;
3976: if (!defined($part)) { $part = '0'; }
3977: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3978: $self->symb(), $env{'user.domain'},
3979: $env{'user.name'},
3980: $env{'request.course.sec'});
3981: }
3982: sub part_display {
3983: my $self= shift(); my $partID = shift();
3984: if (! defined($partID)) { $partID = '0'; }
3985: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3986: $self->symb);
3987: if (! defined($display) || $display eq '') {
3988: $display = $partID;
3989: }
3990: return $display;
3991: }
3992:
3993: # Multiple things need this
3994: sub getReturnHash {
3995: my $self = shift;
3996:
3997: if (!defined($self->{RETURN_HASH})) {
3998: my %tmpHash = &Apache::lonnet::restore($self->symb());
3999: $self->{RETURN_HASH} = \%tmpHash;
4000: }
4001: }
4002:
4003: ######
4004: # Status queries
4005: ######
4006:
4007: # These methods query the status of problems.
4008:
4009: # If we need to count parts, this function determines the number of
4010: # parts from the metadata. When called, it returns a reference to a list
4011: # of strings corresponding to the parts. (Thus, using it in a scalar context
4012: # tells you how many parts you have in the problem:
4013: # $partcount = scalar($resource->countParts());
4014: # Don't use $self->{PARTS} directly because you don't know if it's been
4015: # computed yet.
4016:
4017: =pod
4018:
4019: =head2 Resource misc
4020:
4021: Misc. functions for the resource.
4022:
4023: =over 4
4024:
4025: =item * B<hasDiscussion>:
4026:
4027: Returns a false value if there has been discussion since the user last
4028: logged in, true if there has. Always returns false if the discussion
4029: data was not extracted when the nav map was constructed.
4030:
4031: =item * B<getFeedback>:
4032:
4033: Gets the feedback for the resource and returns the raw feedback string
4034: for the resource, or the null string if there is no feedback or the
4035: email data was not extracted when the nav map was constructed. Usually
4036: used like this:
4037:
4038: for (split(/\,/, $res->getFeedback())) {
4039: my $link = &Apache::lonnet::escape($_);
4040: ...
4041:
4042: and use the link as appropriate.
4043:
4044: =cut
4045:
4046: sub hasDiscussion {
4047: my $self = shift;
4048: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4049: }
4050:
4051: sub getFeedback {
4052: my $self = shift;
4053: my $source = $self->src();
4054: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4055: return $self->{NAV_MAP}->getFeedback($source);
4056: }
4057:
4058: sub getErrors {
4059: my $self = shift;
4060: my $source = $self->src();
4061: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4062: return $self->{NAV_MAP}->getErrors($source);
4063: }
4064:
4065: =pod
4066:
4067: =item * B<parts>():
4068:
4069: Returns a list reference containing sorted strings corresponding to
4070: each part of the problem. Single part problems have only a part '0'.
4071: Multipart problems do not return their part '0', since they typically
4072: do not really matter.
4073:
4074: =item * B<countParts>():
4075:
4076: Returns the number of parts of the problem a student can answer. Thus,
4077: for single part problems, returns 1. For multipart, it returns the
4078: number of parts in the problem, not including psuedo-part 0.
4079:
4080: =item * B<countResponses>():
4081:
4082: Returns the total number of responses in the problem a student can answer.
4083:
4084: =item * B<responseTypes>():
4085:
4086: Returns a hash whose keys are the response types. The values are the number
4087: of times each response type is used. This is for the I<entire> problem, not
4088: just a single part.
4089:
4090: =item * B<multipart>():
4091:
4092: Returns true if the problem is multipart, false otherwise. Use this instead
4093: of countParts if all you want is multipart/not multipart.
4094:
4095: =item * B<responseType>($part):
4096:
4097: Returns the response type of the part, without the word "response" on the
4098: end. Example return values: 'string', 'essay', 'numeric', etc.
4099:
4100: =item * B<responseIds>($part):
4101:
4102: Retreives the response IDs for the given part as an array reference containing
4103: strings naming the response IDs. This may be empty.
4104:
4105: =back
4106:
4107: =cut
4108:
4109: sub parts {
4110: my $self = shift;
4111:
4112: if ($self->ext) { return []; }
4113:
4114: $self->extractParts();
4115: return $self->{PARTS};
4116: }
4117:
4118: sub countParts {
4119: my $self = shift;
4120:
4121: my $parts = $self->parts();
4122:
4123: # If I left this here, then it's not necessary.
4124: #my $delta = 0;
4125: #for my $part (@$parts) {
4126: # if ($part eq '0') { $delta--; }
4127: #}
4128:
4129: if ($self->{RESOURCE_ERROR}) {
4130: return 0;
4131: }
4132:
4133: return scalar(@{$parts}); # + $delta;
4134: }
4135:
4136: sub countResponses {
4137: my $self = shift;
4138: my $count;
4139: foreach my $part (@{$self->parts()}) {
4140: $count+= scalar($self->responseIds($part));
4141: }
4142: return $count;
4143: }
4144:
4145: sub responseTypes {
4146: my $self = shift;
4147: my %responses;
4148: foreach my $part ($self->parts()) {
4149: foreach my $responsetype ($self->responseType($part)) {
4150: $responses{$responsetype}++ if (defined($responsetype));
4151: }
4152: }
4153: return %responses;
4154: }
4155:
4156: sub multipart {
4157: my $self = shift;
4158: return $self->countParts() > 1;
4159: }
4160:
4161: sub singlepart {
4162: my $self = shift;
4163: return $self->countParts() == 1;
4164: }
4165:
4166: sub responseType {
4167: my $self = shift;
4168: my $part = shift;
4169:
4170: $self->extractParts();
4171: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4172: return @{$self->{RESPONSE_TYPES}->{$part}};
4173: } else {
4174: return undef;
4175: }
4176: }
4177:
4178: sub responseIds {
4179: my $self = shift;
4180: my $part = shift;
4181:
4182: $self->extractParts();
4183: if (defined($self->{RESPONSE_IDS}->{$part})) {
4184: return @{$self->{RESPONSE_IDS}->{$part}};
4185: } else {
4186: return undef;
4187: }
4188: }
4189:
4190: # Private function: Extracts the parts information, both part names and
4191: # part types, and saves it.
4192: sub extractParts {
4193: my $self = shift;
4194:
4195: return if (defined($self->{PARTS}));
4196: return if ($self->ext);
4197:
4198: $self->{PARTS} = [];
4199:
4200: my %parts;
4201:
4202: # Retrieve part count, if this is a problem
4203: if ($self->is_problem()) {
4204: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4205: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4206:
4207: if ($partorder) {
4208: my @parts;
4209: for my $part (split (/,/,$partorder)) {
4210: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4211: push @parts, $part;
4212: $parts{$part} = 1;
4213: }
4214: }
4215: $self->{PARTS} = \@parts;
4216: } else {
4217: if (!$metadata) {
4218: $self->{RESOURCE_ERROR} = 1;
4219: $self->{PARTS} = [];
4220: $self->{PART_TYPE} = {};
4221: return;
4222: }
4223: foreach (split(/\,/,$metadata)) {
4224: if ($_ =~ /^(?:part|Task)_(.*)$/) {
4225: my $part = $1;
4226: # This floods the logs if it blows up
4227: if (defined($parts{$part})) {
4228: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4229: }
4230:
4231: # check to see if part is turned off.
4232:
4233: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4234: $parts{$part} = 1;
4235: }
4236: }
4237: }
4238: my @sortedParts = sort keys %parts;
4239: $self->{PARTS} = \@sortedParts;
4240: }
4241:
4242:
4243: # These hashes probably do not need names that end with "Hash"....
4244: my %responseIdHash;
4245: my %responseTypeHash;
4246:
4247:
4248: # Init the responseIdHash
4249: foreach (@{$self->{PARTS}}) {
4250: $responseIdHash{$_} = [];
4251: }
4252:
4253: # Now, the unfortunate thing about this is that parts, part name, and
4254: # response id are delimited by underscores, but both the part
4255: # name and response id can themselves have underscores in them.
4256: # So we have to use our knowlege of part names to figure out
4257: # where the part names begin and end, and even then, it is possible
4258: # to construct ambiguous situations.
4259: foreach (split /,/, $metadata) {
4260: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4261: my $responseType = $1;
4262: my $partStuff = $2;
4263: my $partIdSoFar = '';
4264: my @partChunks = split /_/, $partStuff;
4265: my $i = 0;
4266: for ($i = 0; $i < scalar(@partChunks); $i++) {
4267: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4268: $partIdSoFar .= $partChunks[$i];
4269: if ($parts{$partIdSoFar}) {
4270: my @otherChunks = @partChunks[$i+1..$#partChunks];
4271: my $responseId = join('_', @otherChunks);
4272: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4273: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4274: }
4275: }
4276: }
4277: }
4278: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4279: #
4280: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4281: if ($resorder) {
4282: my @resorder=split(/,/,$resorder);
4283: foreach my $part (keys(%responseIdHash)) {
4284: my $i=0;
4285: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4286: my @neworder;
4287: foreach my $possibleid (@resorder) {
4288: if (exists($resids{$possibleid})) {
4289: push(@neworder,$resids{$possibleid});
4290: }
4291: }
4292: my @ids;
4293: my @type;
4294: foreach my $element (@neworder) {
4295: push (@ids,$responseIdHash{$part}->[$element]);
4296: push (@type,$responseTypeHash{$part}->[$element]);
4297: }
4298: $responseIdHash{$part}=\@ids;
4299: $responseTypeHash{$part}=\@type;
4300: }
4301: }
4302: $self->{RESPONSE_IDS} = \%responseIdHash;
4303: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4304: }
4305:
4306: return;
4307: }
4308:
4309: =pod
4310:
4311: =head2 Resource Status
4312:
4313: Problem resources have status information, reflecting their various
4314: dates and completion statuses.
4315:
4316: There are two aspects to the status: the date-related information and
4317: the completion information.
4318:
4319: Idiomatic usage of these two methods would probably look something
4320: like
4321:
4322: foreach ($resource->parts()) {
4323: my $dateStatus = $resource->getDateStatus($_);
4324: my $completionStatus = $resource->getCompletionStatus($_);
4325:
4326: or
4327:
4328: my $status = $resource->status($_);
4329:
4330: ... use it here ...
4331: }
4332:
4333: Which you use depends on exactly what you are looking for. The
4334: status() function has been optimized for the nav maps display and may
4335: not precisely match what you need elsewhere.
4336:
4337: The symbolic constants shown below can be accessed through the
4338: resource object: C<$res->OPEN>.
4339:
4340: =over 4
4341:
4342: =item * B<getDateStatus>($part):
4343:
4344: ($part defaults to 0). A convenience function that returns a symbolic
4345: constant telling you about the date status of the part. The possible
4346: return values are:
4347:
4348: =back
4349:
4350: B<Date Codes>
4351:
4352: =over 4
4353:
4354: =item * B<OPEN_LATER>:
4355:
4356: The problem will be opened later.
4357:
4358: =item * B<OPEN>:
4359:
4360: Open and not yet due.
4361:
4362:
4363: =item * B<PAST_DUE_ANSWER_LATER>:
4364:
4365: The due date has passed, but the answer date has not yet arrived.
4366:
4367: =item * B<PAST_DUE_NO_ANSWER>:
4368:
4369: The due date has passed and there is no answer opening date set.
4370:
4371: =item * B<ANSWER_OPEN>:
4372:
4373: The answer date is here.
4374:
4375: =item * B<NETWORK_FAILURE>:
4376:
4377: The information is unknown due to network failure.
4378:
4379: =back
4380:
4381: =cut
4382:
4383: # Apparently the compiler optimizes these into constants automatically
4384: sub OPEN_LATER { return 0; }
4385: sub OPEN { return 1; }
4386: sub PAST_DUE_NO_ANSWER { return 2; }
4387: sub PAST_DUE_ANSWER_LATER { return 3; }
4388: sub ANSWER_OPEN { return 4; }
4389: sub NOTHING_SET { return 5; }
4390: sub NETWORK_FAILURE { return 100; }
4391:
4392: # getDateStatus gets the date status for a given problem part.
4393: # Because answer date, due date, and open date are fully independent
4394: # (i.e., it is perfectly possible to *only* have an answer date),
4395: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4396: # (past, future, none given). This function handles this with a decision
4397: # tree. Read the comments to follow the decision tree.
4398:
4399: sub getDateStatus {
4400: my $self = shift;
4401: my $part = shift;
4402: $part = "0" if (!defined($part));
4403:
4404: # Always return network failure if there was one.
4405: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4406:
4407: my $now = time();
4408:
4409: my $open = $self->opendate($part);
4410: my $due = $self->duedate($part);
4411: my $answer = $self->answerdate($part);
4412:
4413: if (!$open && !$due && !$answer) {
4414: # no data on the problem at all
4415: # should this be the same as "open later"? think multipart.
4416: return $self->NOTHING_SET;
4417: }
4418: if (!$open || $now < $open) {return $self->OPEN_LATER}
4419: if (!$due || $now < $due) {return $self->OPEN}
4420: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4421: if ($answer) { return $self->ANSWER_OPEN; }
4422: return PAST_DUE_NO_ANSWER;
4423: }
4424:
4425: =pod
4426:
4427: B<>
4428:
4429: =over 4
4430:
4431: =item * B<getCompletionStatus>($part):
4432:
4433: ($part defaults to 0.) A convenience function that returns a symbolic
4434: constant telling you about the completion status of the part, with the
4435: following possible results:
4436:
4437: =back
4438:
4439: B<Completion Codes>
4440:
4441: =over 4
4442:
4443: =item * B<NOT_ATTEMPTED>:
4444:
4445: Has not been attempted at all.
4446:
4447: =item * B<INCORRECT>:
4448:
4449: Attempted, but wrong by student.
4450:
4451: =item * B<INCORRECT_BY_OVERRIDE>:
4452:
4453: Attempted, but wrong by instructor override.
4454:
4455: =item * B<CORRECT>:
4456:
4457: Correct or correct by instructor.
4458:
4459: =item * B<CORRECT_BY_OVERRIDE>:
4460:
4461: Correct by instructor override.
4462:
4463: =item * B<EXCUSED>:
4464:
4465: Excused. Not yet implemented.
4466:
4467: =item * B<NETWORK_FAILURE>:
4468:
4469: Information not available due to network failure.
4470:
4471: =item * B<ATTEMPTED>:
4472:
4473: Attempted, and not yet graded.
4474:
4475: =back
4476:
4477: =cut
4478:
4479: sub NOT_ATTEMPTED { return 10; }
4480: sub INCORRECT { return 11; }
4481: sub INCORRECT_BY_OVERRIDE { return 12; }
4482: sub CORRECT { return 13; }
4483: sub CORRECT_BY_OVERRIDE { return 14; }
4484: sub EXCUSED { return 15; }
4485: sub ATTEMPTED { return 16; }
4486:
4487: sub getCompletionStatus {
4488: my $self = shift;
4489: my $part = shift;
4490: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4491:
4492: my $status = $self->queryRestoreHash('solved', $part);
4493:
4494: # Left as separate if statements in case we ever do more with this
4495: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4496: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4497: if ($status eq 'correct_by_override') {
4498: return $self->CORRECT_BY_OVERRIDE;
4499: }
4500: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4501: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4502: if ($status eq 'excused') {return $self->EXCUSED; }
4503: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4504: return $self->NOT_ATTEMPTED;
4505: }
4506:
4507: sub queryRestoreHash {
4508: my $self = shift;
4509: my $hashentry = shift;
4510: my $part = shift;
4511: $part = "0" if (!defined($part) || $part eq '');
4512: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4513:
4514: $self->getReturnHash();
4515:
4516: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4517: }
4518:
4519: =pod
4520:
4521: B<Composite Status>
4522:
4523: Along with directly returning the date or completion status, the
4524: resource object includes a convenience function B<status>() that will
4525: combine the two status tidbits into one composite status that can
4526: represent the status of the resource as a whole. This method represents
4527: the concept of the thing we want to display to the user on the nav maps
4528: screen, which is a combination of completion and open status. The precise logic is
4529: documented in the comments of the status method. The following results
4530: may be returned, all available as methods on the resource object
4531: ($res->NETWORK_FAILURE): In addition to the return values that match
4532: the date or completion status, this function can return "ANSWER_SUBMITTED"
4533: if that problemstatus parameter value is set to No, suppressing the
4534: incorrect/correct feedback.
4535:
4536: =over 4
4537:
4538: =item * B<NETWORK_FAILURE>:
4539:
4540: The network has failed and the information is not available.
4541:
4542: =item * B<NOTHING_SET>:
4543:
4544: No dates have been set for this problem (part) at all. (Because only
4545: certain parts of a multi-part problem may be assigned, this can not be
4546: collapsed into "open later", as we do not know a given part will EVER
4547: be opened. For single part, this is the same as "OPEN_LATER".)
4548:
4549: =item * B<CORRECT>:
4550:
4551: For any reason at all, the part is considered correct.
4552:
4553: =item * B<EXCUSED>:
4554:
4555: For any reason at all, the problem is excused.
4556:
4557: =item * B<PAST_DUE_NO_ANSWER>:
4558:
4559: The problem is past due, not considered correct, and no answer date is
4560: set.
4561:
4562: =item * B<PAST_DUE_ANSWER_LATER>:
4563:
4564: The problem is past due, not considered correct, and an answer date in
4565: the future is set.
4566:
4567: =item * B<ANSWER_OPEN>:
4568:
4569: The problem is past due, not correct, and the answer is now available.
4570:
4571: =item * B<OPEN_LATER>:
4572:
4573: The problem is not yet open.
4574:
4575: =item * B<TRIES_LEFT>:
4576:
4577: The problem is open, has been tried, is not correct, but there are
4578: tries left.
4579:
4580: =item * B<INCORRECT>:
4581:
4582: The problem is open, and all tries have been used without getting the
4583: correct answer.
4584:
4585: =item * B<OPEN>:
4586:
4587: The item is open and not yet tried.
4588:
4589: =item * B<ATTEMPTED>:
4590:
4591: The problem has been attempted.
4592:
4593: =item * B<ANSWER_SUBMITTED>:
4594:
4595: An answer has been submitted, but the student should not see it.
4596:
4597: =back
4598:
4599: =cut
4600:
4601: sub TRIES_LEFT { return 20; }
4602: sub ANSWER_SUBMITTED { return 21; }
4603: sub PARTIALLY_CORRECT{ return 22; }
4604:
4605: sub status {
4606: my $self = shift;
4607: my $part = shift;
4608: if (!defined($part)) { $part = "0"; }
4609: my $completionStatus = $self->getCompletionStatus($part);
4610: my $dateStatus = $self->getDateStatus($part);
4611:
4612: # What we have is a two-dimensional matrix with 4 entries on one
4613: # dimension and 5 entries on the other, which we want to colorize,
4614: # plus network failure and "no date data at all".
4615:
4616: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4617: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4618:
4619: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4620: # If there's an answer date and we're past it, don't
4621: # suppress the feedback; student should know
4622: if ($self->duedate($part) && $self->duedate($part) < time() &&
4623: $self->answerdate($part) && $self->answerdate($part) < time()) {
4624: $suppressFeedback = 0;
4625: }
4626:
4627: # There are a few whole rows we can dispose of:
4628: if ($completionStatus == CORRECT ||
4629: $completionStatus == CORRECT_BY_OVERRIDE ) {
4630: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4631: my $awarded=$self->awarded($part);
4632: if ($awarded < 1 && $awarded > 0) {
4633: return PARTIALLY_CORRECT;
4634: } elsif ($awarded<1) {
4635: return INCORRECT;
4636: }
4637: return CORRECT;
4638: }
4639:
4640: # If it's WRONG... and not open
4641: if ( ($completionStatus == INCORRECT ||
4642: $completionStatus == INCORRECT_BY_OVERRIDE)
4643: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
4644: return INCORRECT;
4645: }
4646:
4647: if ($completionStatus == ATTEMPTED) {
4648: return ATTEMPTED;
4649: }
4650:
4651: # If it's EXCUSED, then return that no matter what
4652: if ($completionStatus == EXCUSED) {
4653: return EXCUSED;
4654: }
4655:
4656: if ($dateStatus == NOTHING_SET) {
4657: return NOTHING_SET;
4658: }
4659:
4660: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4661: # by 4 matrix (date statuses).
4662:
4663: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4664: $dateStatus == PAST_DUE_NO_ANSWER ) {
4665: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4666: }
4667:
4668: if ($dateStatus == ANSWER_OPEN) {
4669: return ANSWER_OPEN;
4670: }
4671:
4672: # Now: (incorrect, incorrect_override, not_attempted) x
4673: # (open_later), (open)
4674:
4675: if ($dateStatus == OPEN_LATER) {
4676: return OPEN_LATER;
4677: }
4678:
4679: # If it's WRONG...
4680: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4681: # and there are TRIES LEFT:
4682: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4683: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4684: }
4685: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4686: }
4687:
4688: # Otherwise, it's untried and open
4689: return OPEN;
4690: }
4691:
4692: sub CLOSED { return 23; }
4693: sub ERROR { return 24; }
4694:
4695: =pod
4696:
4697: B<Simple Status>
4698:
4699: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4700: "Simple status" corresponds to "which icon is shown on the
4701: Navmaps". There are six "simple" statuses:
4702:
4703: =over 4
4704:
4705: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4706:
4707: =item * B<OPEN>: The problem is open and unattempted.
4708:
4709: =item * B<CORRECT>: The problem is correct for any reason.
4710:
4711: =item * B<INCORRECT>: The problem is incorrect and can still be
4712: completed successfully.
4713:
4714: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4715: does not know if they are correct. (The ellipsis icon.)
4716:
4717: =item * B<ERROR>: There is an error retrieving information about this
4718: problem.
4719:
4720: =back
4721:
4722: =cut
4723:
4724: # This hash maps the composite status to this simple status, and
4725: # can be used directly, if you like
4726: my %compositeToSimple =
4727: (
4728: NETWORK_FAILURE() => ERROR,
4729: NOTHING_SET() => CLOSED,
4730: CORRECT() => CORRECT,
4731: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4732: EXCUSED() => CORRECT,
4733: PAST_DUE_NO_ANSWER() => INCORRECT,
4734: PAST_DUE_ANSWER_LATER() => INCORRECT,
4735: ANSWER_OPEN() => INCORRECT,
4736: OPEN_LATER() => CLOSED,
4737: TRIES_LEFT() => OPEN,
4738: INCORRECT() => INCORRECT,
4739: OPEN() => OPEN,
4740: ATTEMPTED() => ATTEMPTED,
4741: ANSWER_SUBMITTED() => ATTEMPTED
4742: );
4743:
4744: sub simpleStatus {
4745: my $self = shift;
4746: my $part = shift;
4747: my $status = $self->status($part);
4748: return $compositeToSimple{$status};
4749: }
4750:
4751: =pod
4752:
4753: B<simpleStatusCount> will return an array reference containing, in
4754: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4755: and ERROR parts the given problem has.
4756:
4757: =cut
4758:
4759: # This maps the status to the slot we want to increment
4760: my %statusToSlotMap =
4761: (
4762: OPEN() => 0,
4763: CLOSED() => 1,
4764: CORRECT() => 2,
4765: INCORRECT() => 3,
4766: ATTEMPTED() => 4,
4767: ERROR() => 5
4768: );
4769:
4770: sub statusToSlot { return $statusToSlotMap{shift()}; }
4771:
4772: sub simpleStatusCount {
4773: my $self = shift;
4774:
4775: my @counts = (0, 0, 0, 0, 0, 0, 0);
4776: foreach my $part (@{$self->parts()}) {
4777: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4778: }
4779:
4780: return \@counts;
4781: }
4782:
4783: =pod
4784:
4785: B<Completable>
4786:
4787: The completable method represents the concept of I<whether the student can
4788: currently do the problem>. If the student can do the problem, which means
4789: that it is open, there are tries left, and if the problem is manually graded
4790: or the grade is suppressed via problemstatus, the student has not tried it
4791: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4792: either the student has tried it and there is no feedback, or that for
4793: some reason it is no longer completable (not open yet, successfully completed,
4794: out of tries, etc.). As an example, this is used as the filter for the
4795: "Uncompleted Homework" option for the nav maps.
4796:
4797: If this does not quite meet your needs, do not fiddle with it (unless you are
4798: fixing it to better match the student's conception of "completable" because
4799: it's broken somehow)... make a new method.
4800:
4801: =cut
4802:
4803: sub completable {
4804: my $self = shift;
4805: if (!$self->is_problem()) { return 0; }
4806: my $partCount = $self->countParts();
4807:
4808: foreach my $part (@{$self->parts()}) {
4809: if ($part eq '0' && $partCount != 1) { next; }
4810: my $status = $self->status($part);
4811: # "If any of the parts are open, or have tries left (implies open),
4812: # and it is not "attempted" (manually graded problem), it is
4813: # not "complete"
4814: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4815: $status == ANSWER_SUBMITTED() ) {
4816: # did this part already, as well as we can
4817: next;
4818: }
4819: if ($status == OPEN() || $status == TRIES_LEFT()) {
4820: return 1;
4821: }
4822: }
4823:
4824: # If all the parts were complete, so was this problem.
4825: return 0;
4826: }
4827:
4828: =pod
4829:
4830: =head2 Resource/Nav Map Navigation
4831:
4832: =over 4
4833:
4834: =item * B<getNext>():
4835:
4836: Retreive an array of the possible next resources after this
4837: one. Always returns an array, even in the one- or zero-element case.
4838:
4839: =item * B<getPrevious>():
4840:
4841: Retreive an array of the possible previous resources from this
4842: one. Always returns an array, even in the one- or zero-element case.
4843:
4844: =cut
4845:
4846: sub getNext {
4847: my $self = shift;
4848: my @branches;
4849: my $to = $self->to();
4850: foreach my $branch ( split(/,/, $to) ) {
4851: my $choice = $self->{NAV_MAP}->getById($branch);
4852: #if (!$choice->condition()) { next; }
4853: my $next = $choice->goesto();
4854: $next = $self->{NAV_MAP}->getById($next);
4855:
4856: push @branches, $next;
4857: }
4858: return \@branches;
4859: }
4860:
4861: sub getPrevious {
4862: my $self = shift;
4863: my @branches;
4864: my $from = $self->from();
4865: foreach my $branch ( split /,/, $from) {
4866: my $choice = $self->{NAV_MAP}->getById($branch);
4867: my $prev = $choice->comesfrom();
4868: $prev = $self->{NAV_MAP}->getById($prev);
4869:
4870: push @branches, $prev;
4871: }
4872: return \@branches;
4873: }
4874:
4875: sub browsePriv {
4876: my $self = shift;
4877: if (defined($self->{BROWSE_PRIV})) {
4878: return $self->{BROWSE_PRIV};
4879: }
4880:
4881: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4882: $self->symb());
4883: }
4884:
4885: =pod
4886:
4887: =back
4888:
4889: =cut
4890:
4891: 1;
4892:
4893: __END__
4894:
4895:
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