1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.345 2005/10/30 02:31:01 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use GDBM_File;
34: use Apache::Constants qw(:common :http);
35: use Apache::loncommon();
36: use Apache::lonmenu();
37: use Apache::lonenc();
38: use Apache::lonlocal;
39: use Apache::lonnet;
40: use POSIX qw (floor strftime);
41: use Data::Dumper; # for debugging, not always
42: use Time::HiRes qw( gettimeofday tv_interval );
43:
44: # symbolic constants
45: sub SYMB { return 1; }
46: sub URL { return 2; }
47: sub NOTHING { return 3; }
48:
49: # Some data
50:
51: my $resObj = "Apache::lonnavmaps::resource";
52:
53: # Keep these mappings in sync with lonquickgrades, which uses the colors
54: # instead of the icons.
55: my %statusIconMap =
56: (
57: $resObj->CLOSED => '',
58: $resObj->OPEN => 'navmap.open.gif',
59: $resObj->CORRECT => 'navmap.correct.gif',
60: $resObj->PARTIALLY_CORRECT => 'navmap.ellipsis.gif',
61: $resObj->INCORRECT => 'navmap.wrong.gif',
62: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
63: $resObj->ERROR => ''
64: );
65:
66: my %iconAltTags =
67: ( 'navmap.correct.gif' => 'Correct',
68: 'navmap.wrong.gif' => 'Incorrect',
69: 'navmap.open.gif' => 'Open' );
70:
71: # Defines a status->color mapping, null string means don't color
72: my %colormap =
73: ( $resObj->NETWORK_FAILURE => '',
74: $resObj->CORRECT => '',
75: $resObj->EXCUSED => '#3333FF',
76: $resObj->PAST_DUE_ANSWER_LATER => '',
77: $resObj->PAST_DUE_NO_ANSWER => '',
78: $resObj->ANSWER_OPEN => '#006600',
79: $resObj->OPEN_LATER => '',
80: $resObj->TRIES_LEFT => '',
81: $resObj->INCORRECT => '',
82: $resObj->OPEN => '',
83: $resObj->NOTHING_SET => '',
84: $resObj->ATTEMPTED => '',
85: $resObj->ANSWER_SUBMITTED => '',
86: $resObj->PARTIALLY_CORRECT => '#006600'
87: );
88: # And a special case in the nav map; what to do when the assignment
89: # is not yet done and due in less then 24 hours
90: my $hurryUpColor = "#FF0000";
91:
92: sub launch_win {
93: my ($mode,$script,$toplinkitems,$firsttime)=@_;
94: my $result;
95: if ($script ne 'no') {
96: $result.='<script type="text/javascript">';
97: }
98: if ($firsttime) {
99: $result.='function launch_navmapwin() {
100: newWindow=open(\'/adm/navmaps?launchExternalRoles\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
101: }';
102: } else {
103: $result.='function launch_navmapwin() {
104: newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
105: }';
106: }
107: if ($mode eq 'now') {
108: $result.="\nlaunch_navmapwin();\n";
109: }
110: if ($script ne 'no') {
111: $result.='</script>';
112: }
113: if ($mode eq 'link') {
114: &add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
115: "Launch navigation window");
116: }
117: return $result;
118: }
119:
120: sub close {
121: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
122: return(<<ENDCLOSE);
123: <script type="text/javascript">
124: window.status='Accessing Nav Control';
125: menu=window.open("/adm/rat/empty.html","loncapanav",
126: "height=600,width=400,scrollbars=1");
127: window.status='Closing Nav Control';
128: menu.close();
129: window.status='Done.';
130: </script>
131: ENDCLOSE
132: }
133:
134: sub update {
135: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
136: if (!$env{'request.course.id'}) { return ''; }
137: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
138: return(<<ENDUPDATE);
139: <form name="navform"></form>
140: <script type="text/javascript">
141: this.document.navform.action='/adm/navmaps#curloc';
142: this.document.navform.target='loncapanav';
143: this.document.navform.submit();
144: </script>
145: ENDUPDATE
146: }
147:
148: sub handler {
149: my $r = shift;
150: real_handler($r);
151: }
152:
153: sub real_handler {
154: my $r = shift;
155: #my $t0=[&gettimeofday()];
156: # Handle header-only request
157: if ($r->header_only) {
158: if ($env{'browser.mathml'}) {
159: &Apache::loncommon::content_type($r,'text/xml');
160: } else {
161: &Apache::loncommon::content_type($r,'text/html');
162: }
163: $r->send_http_header;
164: return OK;
165: }
166:
167: # Send header, don't cache this page
168: if ($env{'browser.mathml'}) {
169: &Apache::loncommon::content_type($r,'text/xml');
170: } else {
171: &Apache::loncommon::content_type($r,'text/html');
172: }
173: &Apache::loncommon::no_cache($r);
174: $r->send_http_header;
175:
176: my %toplinkitems=();
177: &add_linkitem(\%toplinkitems,'blank','',"Select Action");
178: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
179: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
180: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
181: my $menu=&Apache::lonmenu::reopenmenu();
182: my $navstatus=&Apache::lonmenu::get_nav_status();
183: if ($menu) {
184: $menu=(<<MENU)
185: swmenu=$menu
186: swmenu.clearTimeout(swmenu.menucltim);
187: $navstatus
188: MENU
189: } else {
190: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
191: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
192: $menu=(<<MENU)
193: swmenu=$mainwindow
194: $navstatus
195: MENU
196: }
197: my $html=&Apache::lonxml::xmlbegin();
198: $r->print(<<"ENDSUBM");
199: $html
200: <head>
201: <script type="text/javascript">
202: function submitthis() {
203: $menu
204: self.close();
205: }
206:
207: </script>
208: </head>
209: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
210: </html>
211: ENDSUBM
212: return;
213: }
214: if ($ENV{QUERY_STRING} =~ /^launchExternal/) {
215: &Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
216: &Apache::lonnet::appenv('environment.remotenavmap' => 'on');
217: my $menu=&Apache::lonmenu::reopenmenu();
218: my $navstatus=&Apache::lonmenu::get_nav_status();
219: if ($menu) {
220: $r->print(<<MENU);
221: <script type="text/javascript">
222: swmenu=$menu
223: swmenu.clearTimeout(swmenu.menucltim);
224: $navstatus
225: </script>
226: MENU
227: }
228: }
229: if ($ENV{QUERY_STRING} eq 'turningOffExternal') {
230: $env{'environment.remotenavmap'}='off';
231: }
232:
233: # Create the nav map
234: my $navmap = Apache::lonnavmaps::navmap->new();
235:
236: if (!defined($navmap)) {
237: my $requrl = $r->uri;
238: $env{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
239: return HTTP_NOT_ACCEPTABLE;
240: }
241: my $html=&Apache::lonxml::xmlbegin();
242: $r->print("$html<head>\n");
243: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
244: # ------------------------------------------------------------ Get query string
245: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework','postsymb']);
246:
247: # ----------------------------------------------------- Force menu registration
248: my $addentries='';
249: my $more_unload;
250: my $body_only='';
251: if ($env{'environment.remotenavmap'} eq 'on') {
252: $r->print('<script type="text/javascript">
253: function collapse() {
254: this.document.location="/adm/navmaps?collapseExternal";
255: }
256: </script>');
257: # FIXME need to be smarter to only catch window close events
258: # $more_unload="collapse()"
259: $body_only=1;
260: }
261: if ($env{'form.register'}) {
262: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
263: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
264: $more_unload.'"';
265: $r->print(&Apache::lonmenu::registerurl(1));
266: } else {
267: $addentries=' onUnload="'.$more_unload.'"';
268: }
269:
270: # Header
271: $r->print('</head>'.
272: &Apache::loncommon::bodytag('Navigate Course Contents','',
273: $addentries,$body_only,'',
274: $env{'form.register'}));
275: $r->print('<script>window.focus();</script>');
276:
277: $r->rflush();
278:
279: # Check that it's defined
280: if (!($navmap->courseMapDefined())) {
281: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
282: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
283: '</body></html>');
284: return OK;
285: }
286:
287: # See if there's only one map in the top-level, if we don't
288: # already have a filter... if so, automatically display it
289: # (older code; should use retrieveResources)
290: if ($ENV{QUERY_STRING} !~ /filter/) {
291: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
292: my $curRes;
293: my $sequenceCount = 0;
294: my $sequenceId;
295: while ($curRes = $iterator->next()) {
296: if (ref($curRes) && $curRes->is_sequence()) {
297: $sequenceCount++;
298: $sequenceId = $curRes->map_pc();
299: }
300: }
301:
302: if ($sequenceCount == 1) {
303: # The automatic iterator creation in the render call
304: # will pick this up. We know the condition because
305: # the defined($env{'form.filter'}) also ensures this
306: # is a fresh call.
307: $env{'form.filter'} = "$sequenceId";
308: }
309: }
310:
311: if ($ENV{QUERY_STRING} eq 'launchExternal') {
312: $r->print('
313: <form name="returnwin" action="/adm/flip?postdata=navlaunch%3a"
314: method="post" target="loncapaclient">
315: </form>');
316: $r->print('
317: <script type="text/javascript">
318: this.document.returnwin.submit();
319: </script>');
320: }
321:
322: if ($env{'environment.remotenavmap'} ne 'on') {
323: $r->print(&launch_win('link','yes',\%toplinkitems));
324: }
325: if ($env{'environment.remotenavmap'} eq 'on') {
326: &add_linkitem(\%toplinkitems,'closenav','collapse()',
327: "Close navigation window");
328: }
329:
330: my $jumpToFirstHomework = 0;
331: # Check to see if the student is jumping to next open, do-able problem
332: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
333: $jumpToFirstHomework = 1;
334: # Find the next homework problem that they can do.
335: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
336: my $curRes;
337: my $foundDoableProblem = 0;
338: my $problemRes;
339:
340: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
341: if (ref($curRes) && $curRes->is_problem()) {
342: my $status = $curRes->status();
343: if ($curRes->completable()) {
344: $problemRes = $curRes;
345: $foundDoableProblem = 1;
346:
347: # Pop open all previous maps
348: my $stack = $iterator->getStack();
349: pop @$stack; # last resource in the stack is the problem
350: # itself, which we don't need in the map stack
351: my @mapPcs = map {$_->map_pc()} @$stack;
352: $env{'form.filter'} = join(',', @mapPcs);
353:
354: # Mark as both "here" and "jump"
355: $env{'form.postsymb'} = $curRes->symb();
356: }
357: }
358: }
359:
360: # If we found no problems, print a note to that effect.
361: if (!$foundDoableProblem) {
362: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
363: }
364: } else {
365: &add_linkitem(\%toplinkitems,'firsthomework',
366: 'location.href="navmaps?jumpToFirstHomework"',
367: "Show Me My First Homework Problem");
368: }
369:
370: my $suppressEmptySequences = 0;
371: my $filterFunc = undef;
372: my $resource_no_folder_link = 0;
373:
374: # Display only due homework.
375: my $showOnlyHomework = 0;
376: if ($env{'form.showOnlyHomework'} eq "1") {
377: $showOnlyHomework = 1;
378: $suppressEmptySequences = 1;
379: $filterFunc = sub { my $res = shift;
380: return $res->completable() || $res->is_map();
381: };
382: &add_linkitem(\%toplinkitems,'everything',
383: 'location.href="navmaps?sort='.$env{'form.sort'}.'"',
384: "Show Everything");
385: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
386: $env{'form.filter'} = '';
387: $env{'form.condition'} = 1;
388: $resource_no_folder_link = 1;
389: } else {
390: &add_linkitem(\%toplinkitems,'uncompleted',
391: 'location.href="navmaps?sort='.$env{'form.sort'}.
392: '&showOnlyHomework=1"',
393: "Show Only Uncompleted Homework");
394: }
395:
396: my %selected=($env{'form.sort'} => 'selected=on');
397: my $sort_html=("<form>
398: <nobr>
399: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$env{'form.showOnlyHomework'}."\" />
400: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
401: <select name=\"sort\">
402: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
403: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
404: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
405: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has New Discussion')."</option>
406: </select>
407: </nobr>
408: </form>");
409: # renderer call
410: my $renderArgs = { 'cols' => [0,1,2,3],
411: 'sort' => $env{'form.sort'},
412: 'url' => '/adm/navmaps',
413: 'navmap' => $navmap,
414: 'suppressNavmap' => 1,
415: 'suppressEmptySequences' => $suppressEmptySequences,
416: 'filterFunc' => $filterFunc,
417: 'resource_no_folder_link' => $resource_no_folder_link,
418: 'sort_html'=> $sort_html,
419: 'r' => $r,
420: 'caller' => 'navmapsdisplay',
421: 'linkitems' => \%toplinkitems};
422: my $render = render($renderArgs);
423:
424: # If no resources were printed, print a reassuring message so the
425: # user knows there was no error.
426: if ($renderArgs->{'counter'} == 0) {
427: if ($showOnlyHomework) {
428: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
429: } else { # both jumpToFirstHomework and normal use the same: course must be empty
430: $r->print("<p><font size='+1'>This course is empty.</font></p>");
431: }
432: }
433: #my $td=&tv_interval($t0);
434: #$r->print("<br />$td");
435:
436: $r->print("</body></html>");
437: $r->rflush();
438:
439: return OK;
440: }
441:
442: # Convenience functions: Returns a string that adds or subtracts
443: # the second argument from the first hash, appropriate for the
444: # query string that determines which folders to recurse on
445: sub addToFilter {
446: my $hashIn = shift;
447: my $addition = shift;
448: my %hash = %$hashIn;
449: $hash{$addition} = 1;
450:
451: return join (",", keys(%hash));
452: }
453:
454: sub removeFromFilter {
455: my $hashIn = shift;
456: my $subtraction = shift;
457: my %hash = %$hashIn;
458:
459: delete $hash{$subtraction};
460: return join(",", keys(%hash));
461: }
462:
463: # Convenience function: Given a stack returned from getStack on the iterator,
464: # return the correct src() value.
465: sub getLinkForResource {
466: my $stack = shift;
467: my $res;
468:
469: # Check to see if there are any pages in the stack
470: foreach $res (@$stack) {
471: if (defined($res)) {
472: my $anchor;
473: if ($res->is_page()) {
474: foreach (@$stack) { if (defined($_)) { $anchor = $_; } }
475: $anchor=&Apache::lonnet::escape($anchor->shown_symb());
476: return ($res->link(),$res->shown_symb(),$anchor);
477: }
478: # in case folder was skipped over as "only sequence"
479: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
480: if ($map=~/\.page$/) {
481: my $url=&Apache::lonnet::clutter($map);
482: $anchor=&Apache::lonnet::escape($src->shown_symb());
483: return ($url,$res->shown_symb(),$anchor);
484: }
485: }
486: }
487:
488: # Failing that, return the src of the last resource that is defined
489: # (when we first recurse on a map, it puts an undefined resource
490: # on the bottom because $self->{HERE} isn't defined yet, and we
491: # want the src for the map anyhow)
492: foreach (@$stack) {
493: if (defined($_)) { $res = $_; }
494: }
495:
496: return ($res->link(),$res->shown_symb());
497: }
498:
499: # Convenience function: This separates the logic of how to create
500: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
501: # etc.) into a separate function. It takes a resource object as the
502: # first parameter, and the part number of the resource as the second.
503: # It's basically a big switch statement on the status of the resource.
504:
505: sub getDescription {
506: my $res = shift;
507: my $part = shift;
508: my $status = $res->status($part);
509:
510: if ($status == $res->NETWORK_FAILURE) {
511: return &mt("Having technical difficulties; please check status later");
512: }
513: if ($status == $res->NOTHING_SET) {
514: return &mt("Not currently assigned.");
515: }
516: if ($status == $res->OPEN_LATER) {
517: return "Open " . timeToHumanString($res->opendate($part),'start');
518: }
519: if ($status == $res->OPEN) {
520: if ($res->duedate($part)) {
521: return &mt("Due")." " .timeToHumanString($res->duedate($part),'end');
522: } else {
523: return &mt("Open, no due date");
524: }
525: }
526: if ($status == $res->PAST_DUE_ANSWER_LATER) {
527: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part),'start');
528: }
529: if ($status == $res->PAST_DUE_NO_ANSWER) {
530: return &mt("Was due")." " . timeToHumanString($res->duedate($part),'end');
531: }
532: if ($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT) {
533: return &mt("Answer available");
534: }
535: if ($status == $res->EXCUSED) {
536: return &mt("Excused by instructor");
537: }
538: if ($status == $res->ATTEMPTED) {
539: return &mt("Answer submitted, not yet graded");
540: }
541: if ($status == $res->TRIES_LEFT) {
542: my $tries = $res->tries($part);
543: my $maxtries = $res->maxtries($part);
544: my $triesString = "";
545: if ($tries && $maxtries) {
546: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
547: if ($maxtries > 1 && $maxtries - $tries == 1) {
548: $triesString = "<b>$triesString</b>";
549: }
550: }
551: if ($res->duedate($part)) {
552: return &mt("Due")." " . timeToHumanString($res->duedate($part),'end') .
553: " $triesString";
554: } else {
555: return &mt("No due date")." $triesString";
556: }
557: }
558: if ($status == $res->ANSWER_SUBMITTED) {
559: return &mt('Answer submitted');
560: }
561: }
562:
563: # Convenience function, so others can use it: Is the problem due in less then
564: # 24 hours, and still can be done?
565:
566: sub dueInLessThan24Hours {
567: my $res = shift;
568: my $part = shift;
569: my $status = $res->status($part);
570:
571: return ($status == $res->OPEN() ||
572: $status == $res->TRIES_LEFT()) &&
573: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
574: $res->duedate($part) > time();
575: }
576:
577: # Convenience function, so others can use it: Is there only one try remaining for the
578: # part, with more then one try to begin with, not due yet and still can be done?
579: sub lastTry {
580: my $res = shift;
581: my $part = shift;
582:
583: my $tries = $res->tries($part);
584: my $maxtries = $res->maxtries($part);
585: return $tries && $maxtries && $maxtries > 1 &&
586: $maxtries - $tries == 1 && $res->duedate($part) &&
587: $res->duedate($part) > time();
588: }
589:
590: # This puts a human-readable name on the env variable.
591:
592: sub advancedUser {
593: return $env{'request.role.adv'};
594: }
595:
596:
597: # timeToHumanString takes a time number and converts it to a
598: # human-readable representation, meant to be used in the following
599: # manner:
600: # print "Due $timestring"
601: # print "Open $timestring"
602: # print "Answer available $timestring"
603: # Very, very, very, VERY English-only... goodness help a localizer on
604: # this func...
605: sub timeToHumanString {
606: my ($time,$type) = @_;
607: # zero, '0' and blank are bad times
608: if (!$time) {
609: return &mt('never');
610: }
611: unless (&Apache::lonlocal::current_language()=~/^en/) {
612: return &Apache::lonlocal::locallocaltime($time);
613: }
614: my $now = time();
615:
616: my @time = localtime($time);
617: my @now = localtime($now);
618:
619: # Positive = future
620: my $delta = $time - $now;
621:
622: my $minute = 60;
623: my $hour = 60 * $minute;
624: my $day = 24 * $hour;
625: my $week = 7 * $day;
626: my $inPast = 0;
627:
628: # Logic in comments:
629: # Is it now? (extremely unlikely)
630: if ( $delta == 0 ) {
631: return "this instant";
632: }
633:
634: if ($delta < 0) {
635: $inPast = 1;
636: $delta = -$delta;
637: }
638:
639: if ( $delta > 0 ) {
640:
641: my $tense = $inPast ? " ago" : "";
642: my $prefix = $inPast ? "" : "in ";
643:
644: # Less then a minute
645: if ( $delta < $minute ) {
646: if ($delta == 1) { return "${prefix}1 second$tense"; }
647: return "$prefix$delta seconds$tense";
648: }
649:
650: # Less then an hour
651: if ( $delta < $hour ) {
652: # If so, use minutes
653: my $minutes = floor($delta / 60);
654: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
655: return "$prefix$minutes minutes$tense";
656: }
657:
658: # Is it less then 24 hours away? If so,
659: # display hours + minutes
660: if ( $delta < $hour * 24) {
661: my $hours = floor($delta / $hour);
662: my $minutes = floor(($delta % $hour) / $minute);
663: my $hourString = "$hours hours";
664: my $minuteString = ", $minutes minutes";
665: if ($hours == 1) {
666: $hourString = "1 hour";
667: }
668: if ($minutes == 1) {
669: $minuteString = ", 1 minute";
670: }
671: if ($minutes == 0) {
672: $minuteString = "";
673: }
674: return "$prefix$hourString$minuteString$tense";
675: }
676:
677: # Less then 5 days away, display day of the week and
678: # HH:MM
679: if ( $delta < $day * 5 ) {
680: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
681: $timeStr =~ s/12:00 am/00:00/;
682: $timeStr =~ s/12:00 pm/noon/;
683: return ($inPast ? "last " : "this ") .
684: $timeStr;
685: }
686:
687: my $conjunction='on';
688: if ($type eq 'start') {
689: $conjunction='at';
690: } elsif ($type eq 'end') {
691: $conjunction='by';
692: }
693: # Is it this year?
694: if ( $time[5] == $now[5]) {
695: # Return on Month Day, HH:MM meridian
696: my $timeStr = strftime("$conjunction %A, %b %e at %I:%M %P", localtime($time));
697: $timeStr =~ s/12:00 am/00:00/;
698: $timeStr =~ s/12:00 pm/noon/;
699: return $timeStr;
700: }
701:
702: # Not this year, so show the year
703: my $timeStr = strftime("$conjunction %A, %b %e %Y at %I:%M %P", localtime($time));
704: $timeStr =~ s/12:00 am/00:00/;
705: $timeStr =~ s/12:00 pm/noon/;
706: return $timeStr;
707: }
708: }
709:
710:
711: =pod
712:
713: =head1 NAME
714:
715: Apache::lonnavmap - Subroutines to handle and render the navigation
716: maps
717:
718: =head1 SYNOPSIS
719:
720: The main handler generates the navigational listing for the course,
721: the other objects export this information in a usable fashion for
722: other modules.
723:
724: =head1 OVERVIEW
725:
726: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
727: course structure and caches it in what is often referred to as the
728: "big hash" X<big hash>. You can see it if you are logged into
729: LON-CAPA, in a course, by going to /adm/test. (You may need to
730: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
731: content of the hash will be under the heading "Big Hash".
732:
733: Big Hash contains, among other things, how resources are related
734: to each other (next/previous), what resources are maps, which
735: resources are being chosen to not show to the student (for random
736: selection), and a lot of other things that can take a lot of time
737: to compute due to the amount of data that needs to be collected and
738: processed.
739:
740: Apache::lonnavmaps provides an object model for manipulating this
741: information in a higher-level fashion then directly manipulating
742: the hash. It also provides access to several auxilary functions
743: that aren't necessarily stored in the Big Hash, but are a per-
744: resource sort of value, like whether there is any feedback on
745: a given resource.
746:
747: Apache::lonnavmaps also abstracts away branching, and someday,
748: conditions, for the times where you don't really care about those
749: things.
750:
751: Apache::lonnavmaps also provides fairly powerful routines for
752: rendering navmaps, and last but not least, provides the navmaps
753: view for when the user clicks the NAV button.
754:
755: B<Note>: Apache::lonnavmaps I<only> works for the "currently
756: logged in user"; if you want things like "due dates for another
757: student" lonnavmaps can not directly retrieve information like
758: that. You need the EXT function. This module can still help,
759: because many things, such as the course structure, are constant
760: between users, and Apache::lonnavmaps can help by providing
761: symbs for the EXT call.
762:
763: The rest of this file will cover the provided rendering routines,
764: which can often be used without fiddling with the navmap object at
765: all, then documents the Apache::lonnavmaps::navmap object, which
766: is the key to accessing the Big Hash information, covers the use
767: of the Iterator (which provides the logic for traversing the
768: somewhat-complicated Big Hash data structure), documents the
769: Apache::lonnavmaps::Resource objects that are returned by
770:
771: =head1 Subroutine: render
772:
773: The navmap renderer package provides a sophisticated rendering of the
774: standard navigation maps interface into HTML. The provided nav map
775: handler is actually just a glorified call to this.
776:
777: Because of the large number of parameters this function accepts,
778: instead of passing it arguments as is normal, pass it in an anonymous
779: hash with the desired options.
780:
781: The package provides a function called 'render', called as
782: Apache::lonnavmaps::render({}).
783:
784: =head2 Overview of Columns
785:
786: The renderer will build an HTML table for the navmap and return
787: it. The table is consists of several columns, and a row for each
788: resource (or possibly each part). You tell the renderer how many
789: columns to create and what to place in each column, optionally using
790: one or more of the prepared columns, and the renderer will assemble
791: the table.
792:
793: Any additional generally useful column types should be placed in the
794: renderer code here, so anybody can use it anywhere else. Any code
795: specific to the current application (such as the addition of <input>
796: elements in a column) should be placed in the code of the thing using
797: the renderer.
798:
799: At the core of the renderer is the array reference COLS (see Example
800: section below for how to pass this correctly). The COLS array will
801: consist of entries of one of two types of things: Either an integer
802: representing one of the pre-packaged column types, or a sub reference
803: that takes a resource reference, a part number, and a reference to the
804: argument hash passed to the renderer, and returns a string that will
805: be inserted into the HTML representation as it.
806:
807: All other parameters are ways of either changing how the columns
808: are printing, or which rows are shown.
809:
810: The pre-packaged column names are refered to by constants in the
811: Apache::lonnavmaps namespace. The following currently exist:
812:
813: =over 4
814:
815: =item * B<Apache::lonnavmaps::resource>:
816:
817: The general info about the resource: Link, icon for the type, etc. The
818: first column in the standard nav map display. This column provides the
819: indentation effect seen in the B<NAV> screen. This column also accepts
820: the following parameters in the renderer hash:
821:
822: =over 4
823:
824: =item * B<resource_nolink>: default false
825:
826: If true, the resource will not be linked. By default, all non-folder
827: resources are linked.
828:
829: =item * B<resource_part_count>: default true
830:
831: If true, the resource will show a part count B<if> the full
832: part list is not displayed. (See "condense_parts" later.) If false,
833: the resource will never show a part count.
834:
835: =item * B<resource_no_folder_link>:
836:
837: If true, the resource's folder will not be clickable to open or close
838: it. Default is false. True implies printCloseAll is false, since you
839: can't close or open folders when this is on anyhow.
840:
841: =back
842:
843: =item * B<Apache::lonnavmaps::communication_status>:
844:
845: Whether there is discussion on the resource, email for the user, or
846: (lumped in here) perl errors in the execution of the problem. This is
847: the second column in the main nav map.
848:
849: =item * B<Apache::lonnavmaps::quick_status>:
850:
851: An icon for the status of a problem, with five possible states:
852: Correct, incorrect, open, awaiting grading (for a problem where the
853: computer's grade is suppressed, or the computer can't grade, like
854: essay problem), or none (not open yet, not a problem). The
855: third column of the standard navmap.
856:
857: =item * B<Apache::lonnavmaps::long_status>:
858:
859: A text readout of the details of the current status of the problem,
860: such as "Due in 22 hours". The fourth column of the standard navmap.
861:
862: =item * B<Apache::lonnavmaps::part_status_summary>:
863:
864: A text readout summarizing the status of the problem. If it is a
865: single part problem, will display "Correct", "Incorrect",
866: "Not yet open", "Open", "Attempted", or "Error". If there are
867: multiple parts, this will output a string that in HTML will show a
868: status of how many parts are in each status, in color coding, trying
869: to match the colors of the icons within reason.
870:
871: Note this only makes sense if you are I<not> showing parts. If
872: C<showParts> is true (see below), this column will not output
873: anything.
874:
875: =back
876:
877: If you add any others please be sure to document them here.
878:
879: An example of a column renderer that will show the ID number of a
880: resource, along with the part name if any:
881:
882: sub {
883: my ($resource, $part, $params) = @_;
884: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
885: return '<td>' . $resource->{ID} . '</td>';
886: }
887:
888: Note these functions are responsible for the TD tags, which allow them
889: to override vertical and horizontal alignment, etc.
890:
891: =head2 Parameters
892:
893: Minimally, you should be
894: able to get away with just using 'cols' (to specify the columns
895: shown), 'url' (necessary for the folders to link to the current screen
896: correctly), and possibly 'queryString' if your app calls for it. In
897: that case, maintaining the state of the folders will be done
898: automatically.
899:
900: =over 4
901:
902: =item * B<iterator>: default: constructs one from %env
903:
904: A reference to a fresh ::iterator to use from the navmaps. The
905: rendering will reflect the options passed to the iterator, so you can
906: use that to just render a certain part of the course, if you like. If
907: one is not passed, the renderer will attempt to construct one from
908: env{'form.filter'} and env{'form.condition'} information, plus the
909: 'iterator_map' parameter if any.
910:
911: =item * B<iterator_map>: default: not used
912:
913: If you are letting the renderer do the iterator handling, you can
914: instruct the renderer to render only a particular map by passing it
915: the source of the map you want to process, like
916: '/res/103/jerf/navmap.course.sequence'.
917:
918: =item * B<navmap>: default: constructs one from %env
919:
920: A reference to a navmap, used only if an iterator is not passed in. If
921: this is necessary to make an iterator but it is not passed in, a new
922: one will be constructed based on env info. This is useful to do basic
923: error checking before passing it off to render.
924:
925: =item * B<r>: default: must be passed in
926:
927: The standard Apache response object. This must be passed to the
928: renderer or the course hash will be locked.
929:
930: =item * B<cols>: default: empty (useless)
931:
932: An array reference
933:
934: =item * B<showParts>:default true
935:
936: A flag. If true, a line for the resource itself, and a line
937: for each part will be displayed. If not, only one line for each
938: resource will be displayed.
939:
940: =item * B<condenseParts>: default true
941:
942: A flag. If true, if all parts of the problem have the same
943: status and that status is Nothing Set, Correct, or Network Failure,
944: then only one line will be displayed for that resource anyhow. If no,
945: all parts will always be displayed. If showParts is 0, this is
946: ignored.
947:
948: =item * B<jumpCount>: default: determined from %env
949:
950: A string identifying the URL to place the anchor 'curloc' at.
951: It is the responsibility of the renderer user to
952: ensure that the #curloc is in the URL. By default, determined through
953: the use of the env{} 'jump' information, and should normally "just
954: work" correctly.
955:
956: =item * B<here>: default: empty string
957:
958: A Symb identifying where to place the 'here' marker. The empty
959: string means no marker.
960:
961: =item * B<indentString>: default: 25 pixel whitespace image
962:
963: A string identifying the indentation string to use.
964:
965: =item * B<queryString>: default: empty
966:
967: A string which will be prepended to the query string used when the
968: folders are opened or closed. You can use this to pass
969: application-specific values.
970:
971: =item * B<url>: default: none
972:
973: The url the folders will link to, which should be the current
974: page. Required if the resource info column is shown, and you
975: are allowing the user to open and close folders.
976:
977: =item * B<currentJumpIndex>: default: no jumping
978:
979: Describes the currently-open row number to cause the browser to jump
980: to, because the user just opened that folder. By default, pulled from
981: the Jump information in the env{'form.*'}.
982:
983: =item * B<printKey>: default: false
984:
985: If true, print the key that appears on the top of the standard
986: navmaps.
987:
988: =item * B<printCloseAll>: default: true
989:
990: If true, print the "Close all folders" or "open all folders"
991: links.
992:
993: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
994:
995: A function that takes the resource object as its only parameter and
996: returns a true or false value. If true, the resource is displayed. If
997: false, it is simply skipped in the display.
998:
999: =item * B<suppressEmptySequences>: default: false
1000:
1001: If you're using a filter function, and displaying sequences to orient
1002: the user, then frequently some sequences will be empty. Setting this to
1003: true will cause those sequences not to display, so as not to confuse the
1004: user into thinking that if the sequence is there there should be things
1005: under it; for example, see the "Show Uncompleted Homework" view on the
1006: B<NAV> screen.
1007:
1008: =item * B<suppressNavmaps>: default: false
1009:
1010: If true, will not display Navigate Content resources.
1011:
1012: =back
1013:
1014: =head2 Additional Info
1015:
1016: In addition to the parameters you can pass to the renderer, which will
1017: be passed through unchange to the column renderers, the renderer will
1018: generate the following information which your renderer may find
1019: useful:
1020:
1021: =over 4
1022:
1023: =item * B<counter>:
1024:
1025: Contains the number of rows printed. Useful after calling the render
1026: function, as you can detect whether anything was printed at all.
1027:
1028: =item * B<isNewBranch>:
1029:
1030: Useful for renderers: If this resource is currently the first resource
1031: of a new branch, this will be true. The Resource column (leftmost in the
1032: navmaps screen) uses this to display the "new branch" icon
1033:
1034: =back
1035:
1036: =cut
1037:
1038: sub resource { return 0; }
1039: sub communication_status { return 1; }
1040: sub quick_status { return 2; }
1041: sub long_status { return 3; }
1042: sub part_status_summary { return 4; }
1043:
1044: sub render_resource {
1045: my ($resource, $part, $params) = @_;
1046:
1047: my $nonLinkedText = ''; # stuff after resource title not in link
1048:
1049: my $link = $params->{"resourceLink"};
1050:
1051: # The URL part is not escaped at this point, but the symb is...
1052: # The stuff to the left of the ? must have ' replaced by \' since
1053: # it will be quoted with ' in the href.
1054:
1055: my ($left,$right) = split(/\?/, $link);
1056: $left =~ s/'/\\'/g;
1057: $link = $left.'?'.$right;
1058:
1059: my $src = $resource->src();
1060: my $it = $params->{"iterator"};
1061: my $filter = $it->{FILTER};
1062:
1063: my $title = $resource->compTitle();
1064:
1065: my $partLabel = "";
1066: my $newBranchText = "";
1067: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1068: # If this is a new branch, label it so
1069: if ($params->{'isNewBranch'}) {
1070: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
1071: }
1072:
1073: # links to open and close the folder
1074:
1075:
1076: my $linkopen = "<a href='$link'>";
1077:
1078:
1079: my $linkclose = "</a>";
1080:
1081: # Default icon: unknown page
1082: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
1083:
1084: if ($resource->is_problem()) {
1085: if ($part eq '0' || $params->{'condensed'}) {
1086: $icon ='<img src="'.$location.'/problem.gif" alt=" " border="0" />';
1087: } else {
1088: $icon = $params->{'indentString'};
1089: }
1090: } else {
1091: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
1092: }
1093:
1094: # Display the correct map icon to open or shut map
1095: if ($resource->is_map()) {
1096: my $mapId = $resource->map_pc();
1097: my $nowOpen = !defined($filter->{$mapId});
1098: if ($it->{CONDITION}) {
1099: $nowOpen = !$nowOpen;
1100: }
1101:
1102: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1103:
1104: if (!$params->{'resource_no_folder_link'}) {
1105: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1106: $icon = "<img src='$location/$icon' alt='".
1107: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1108:
1109: $linkopen = "<a href='" . $params->{'url'} . '?' .
1110: $params->{'queryString'} . '&filter=';
1111: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1112: addToFilter($filter, $mapId) :
1113: removeFromFilter($filter, $mapId);
1114: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1115: . $params->{'hereType'} . '&here=' .
1116: &Apache::lonnet::escape($params->{'here'}) .
1117: '&jump=' .
1118: &Apache::lonnet::escape($resource->symb()) .
1119: "&folderManip=1'>";
1120:
1121: } else {
1122: # Don't allow users to manipulate folder
1123: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1124: '.nomanip.gif';
1125: $icon = "<img src='$location/$icon' alt='".
1126: ($nowOpen ? 'Open Folder' : 'Close Folder')."' border='0' />";
1127:
1128: $linkopen = "";
1129: $linkclose = "";
1130: }
1131: }
1132:
1133: if ($resource->randomout()) {
1134: $nonLinkedText .= ' <i>(hidden)</i> ';
1135: }
1136: if (!$resource->condval()) {
1137: $nonLinkedText .= ' <i>(conditionally hidden)</i> ';
1138: }
1139:
1140: # We're done preparing and finally ready to start the rendering
1141: my $result = "<td align='left' valign='center'>";
1142:
1143: my $indentLevel = $params->{'indentLevel'};
1144: if ($newBranchText) { $indentLevel--; }
1145:
1146: # print indentation
1147: for (my $i = 0; $i < $indentLevel; $i++) {
1148: $result .= $params->{'indentString'};
1149: }
1150:
1151: # Decide what to display
1152:
1153: $result .= "$newBranchText$linkopen$icon$linkclose";
1154:
1155: my $curMarkerBegin = '';
1156: my $curMarkerEnd = '';
1157:
1158: # Is this the current resource?
1159: if (!$params->{'displayedHereMarker'} &&
1160: $resource->symb() eq $params->{'here'} ) {
1161: $curMarkerBegin = '<font color="red" size="+2">></font>';
1162: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1163: $params->{'displayedHereMarker'} = 1;
1164: }
1165:
1166: if ($resource->is_problem() && $part ne '0' &&
1167: !$params->{'condensed'}) {
1168: my $displaypart=$resource->part_display($part);
1169: $partLabel = " (Part: $displaypart)";
1170: if ($link!~/\#/) { $link.='#'.&Apache::lonnet::escape($part); }
1171: $title = "";
1172: }
1173:
1174: if ($params->{'condensed'} && $resource->countParts() > 1) {
1175: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1176: }
1177:
1178: my $target;
1179: if ($env{'environment.remotenavmap'} eq 'on') {
1180: $target=' target="loncapaclient" ';
1181: }
1182: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1183: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1184: } else {
1185: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1186: }
1187:
1188: return $result;
1189: }
1190:
1191: sub render_communication_status {
1192: my ($resource, $part, $params) = @_;
1193: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1194:
1195: my $link = $params->{"resourceLink"};
1196: my $target;
1197: if ($env{'environment.remotenavmap'} eq 'on') {
1198: $target=' target="loncapaclient" ';
1199: }
1200: my $linkopen = "<a $target href='$link'>";
1201: my $linkclose = "</a>";
1202: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1203: if ($resource->hasDiscussion()) {
1204: $discussionHTML = $linkopen .
1205: '<img border="0" src="'.$location.'/chat.gif" />' .
1206: $linkclose;
1207: }
1208:
1209: if ($resource->getFeedback()) {
1210: my $feedback = $resource->getFeedback();
1211: foreach (split(/\,/, $feedback)) {
1212: if ($_) {
1213: $feedbackHTML .= ' <a '.$target.' href="/adm/email?display='
1214: . &Apache::lonnet::escape($_) . '">'
1215: . '<img src="'.$location.'/feedback.gif" '
1216: . 'border="0" /></a>';
1217: }
1218: }
1219: }
1220:
1221: if ($resource->getErrors()) {
1222: my $errors = $resource->getErrors();
1223: my $errorcount = 0;
1224: foreach (split(/,/, $errors)) {
1225: last if ($errorcount>=10); # Only output 10 bombs maximum
1226: if ($_) {
1227: $errorcount++;
1228: $errorHTML .= ' <a '.$target.' href="/adm/email?display='
1229: . &Apache::lonnet::escape($_) . '">'
1230: . '<img src="'.$location.'/bomb.gif" '
1231: . 'border="0" /></a>';
1232: }
1233: }
1234: }
1235:
1236: if ($params->{'multipart'} && $part != '0') {
1237: $discussionHTML = $feedbackHTML = $errorHTML = '';
1238: }
1239:
1240: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1241:
1242: }
1243: sub render_quick_status {
1244: my ($resource, $part, $params) = @_;
1245: my $result = "";
1246: my $firstDisplayed = !$params->{'condensed'} &&
1247: $params->{'multipart'} && $part eq "0";
1248:
1249: my $link = $params->{"resourceLink"};
1250: my $target;
1251: if ($env{'environment.remotenavmap'} eq 'on') {
1252: $target=' target="loncapaclient" ';
1253: }
1254: my $linkopen = "<a $target href='$link'>";
1255: my $linkclose = "</a>";
1256:
1257: if ($resource->is_problem() &&
1258: !$firstDisplayed) {
1259:
1260: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1261: my $alt = $iconAltTags{$icon};
1262: if ($icon) {
1263: my $location=
1264: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1265: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1266: } else {
1267: $result .= "<td width='30'> </td>\n";
1268: }
1269: } else { # not problem, no icon
1270: $result .= "<td width='30'> </td>\n";
1271: }
1272:
1273: return $result;
1274: }
1275: sub render_long_status {
1276: my ($resource, $part, $params) = @_;
1277: my $result = "<td align='right' valign='center'>\n";
1278: my $firstDisplayed = !$params->{'condensed'} &&
1279: $params->{'multipart'} && $part eq "0";
1280:
1281: my $color;
1282: if ($resource->is_problem()) {
1283: $color = $colormap{$resource->status};
1284:
1285: if (dueInLessThan24Hours($resource, $part) ||
1286: lastTry($resource, $part)) {
1287: $color = $hurryUpColor;
1288: }
1289: }
1290:
1291: if ($resource->kind() eq "res" &&
1292: $resource->is_problem() &&
1293: !$firstDisplayed) {
1294: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1295: $result .= getDescription($resource, $part);
1296: if ($color) {$result .= "</b></font>"; }
1297: }
1298: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1299: $result .= '(randomly select ' . $resource->randompick() .')';
1300: }
1301:
1302: # Debugging code
1303: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1304: # ' - Part: ' . $part;
1305:
1306: $result .= "</td>\n";
1307:
1308: return $result;
1309: }
1310:
1311: # Colors obtained by taking the icons, matching the colors, and
1312: # possibly reducing the Value (HSV) of the color, if it's too bright
1313: # for text, generally by one third or so.
1314: my %statusColors =
1315: (
1316: $resObj->CLOSED => '#000000',
1317: $resObj->OPEN => '#998b13',
1318: $resObj->CORRECT => '#26933f',
1319: $resObj->INCORRECT => '#c48207',
1320: $resObj->ATTEMPTED => '#a87510',
1321: $resObj->ERROR => '#000000'
1322: );
1323: my %statusStrings =
1324: (
1325: $resObj->CLOSED => 'Not yet open',
1326: $resObj->OPEN => 'Open',
1327: $resObj->CORRECT => 'Correct',
1328: $resObj->INCORRECT => 'Incorrect',
1329: $resObj->ATTEMPTED => 'Attempted',
1330: $resObj->ERROR => 'Network Error'
1331: );
1332: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1333:
1334: use Data::Dumper;
1335: sub render_parts_summary_status {
1336: my ($resource, $part, $params) = @_;
1337: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1338: if ($params->{showParts}) {
1339: return '<td></td>';
1340: }
1341:
1342: my $td = "<td align='right'>\n";
1343: my $endtd = "</td>\n";
1344: my @probs;
1345:
1346: if ($resource->contains_problem) {
1347: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1348: } else {
1349: @probs=($resource);
1350: }
1351: my $return;
1352: my %overallstatus;
1353: my $totalParts;
1354: foreach my $resource (@probs) {
1355: # If there is a single part, just show the simple status
1356: if ($resource->singlepart()) {
1357: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1358: $overallstatus{$status}++;
1359: $totalParts++;
1360: next;
1361: }
1362: # Now we can be sure the $part doesn't really matter.
1363: my $statusCount = $resource->simpleStatusCount();
1364: my @counts;
1365: foreach my $status (@statuses) {
1366: # decouple display order from the simpleStatusCount order
1367: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1368: if ($statusCount->[$slot]) {
1369: $overallstatus{$status}+=$statusCount->[$slot];
1370: $totalParts+=$statusCount->[$slot];
1371: }
1372: }
1373: }
1374: $return.= $td . $totalParts . ' parts: ';
1375: foreach my $status (@statuses) {
1376: if ($overallstatus{$status}) {
1377: $return.="<font color='" . $statusColors{$status} .
1378: "'>" . $overallstatus{$status} . ' '
1379: . $statusStrings{$status} . "</font>";
1380: }
1381: }
1382: $return.= $endtd;
1383: return $return;
1384: }
1385:
1386: my @preparedColumns = (\&render_resource, \&render_communication_status,
1387: \&render_quick_status, \&render_long_status,
1388: \&render_parts_summary_status);
1389:
1390: sub setDefault {
1391: my ($val, $default) = @_;
1392: if (!defined($val)) { return $default; }
1393: return $val;
1394: }
1395:
1396: sub cmp_title {
1397: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1398: $atitle=~s/^\s*//;
1399: $btitle=~s/^\s*//;
1400: return $atitle cmp $btitle;
1401: }
1402:
1403: sub render {
1404: my $args = shift;
1405: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1406: my $result = '';
1407: # Configure the renderer.
1408: my $cols = $args->{'cols'};
1409: if (!defined($cols)) {
1410: # no columns, no nav maps.
1411: return '';
1412: }
1413: my $navmap;
1414: if (defined($args->{'navmap'})) {
1415: $navmap = $args->{'navmap'};
1416: }
1417:
1418: my $r = $args->{'r'};
1419: my $queryString = $args->{'queryString'};
1420: my $jump = $args->{'jump'};
1421: my $here = $args->{'here'};
1422: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1423: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1424: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1425: # before the current resource when using #current
1426:
1427: # If we were passed 'here' information, we are not rendering
1428: # after a folder manipulation, and we were not passed an
1429: # iterator, make sure we open the folders to show the "here"
1430: # marker
1431: my $filterHash = {};
1432: # Figure out what we're not displaying
1433: foreach (split(/\,/, $env{"form.filter"})) {
1434: if ($_) {
1435: $filterHash->{$_} = "1";
1436: }
1437: }
1438:
1439: # Filter: Remember filter function and add our own filter: Refuse
1440: # to show hidden resources unless the user can see them.
1441: my $userCanSeeHidden = advancedUser();
1442: my $filterFunc = setDefault($args->{'filterFunc'},
1443: sub {return 1;});
1444: if (!$userCanSeeHidden) {
1445: # Without renaming the filterfunc, the server seems to go into
1446: # an infinite loop
1447: my $oldFilterFunc = $filterFunc;
1448: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1449: &$oldFilterFunc($res);};
1450: }
1451:
1452: my $condition = 0;
1453: if ($env{'form.condition'}) {
1454: $condition = 1;
1455: }
1456:
1457: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1458: # Step 1: Check to see if we have a navmap
1459: if (!defined($navmap)) {
1460: $navmap = Apache::lonnavmaps::navmap->new();
1461: if (!defined($navmap)) {
1462: # no londer in course
1463: return '<font color="red">No course selected</font><br />
1464: <a href="/adm/roles">Select a course</a><br />';
1465: }
1466: }
1467:
1468: # Step two: Locate what kind of here marker is necessary
1469: # Determine where the "here" marker is and where the screen jumps to.
1470:
1471: if ($env{'form.postsymb'} ne '') {
1472: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1473: } elsif ($env{'form.postdata'} ne '') {
1474: # couldn't find a symb, is there a URL?
1475: my $currenturl = $env{'form.postdata'};
1476: #$currenturl=~s/^http\:\/\///;
1477: #$currenturl=~s/^[^\/]+//;
1478:
1479: $here = $jump = &Apache::lonnet::symbread($currenturl);
1480: }
1481: if ($here eq '') {
1482: my $last;
1483: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1484: &GDBM_READER(),0640)) {
1485: $last=$hash{'last_known'};
1486: untie(%hash);
1487: }
1488: if ($last) { $here = $jump = $last; }
1489: }
1490:
1491: # Step three: Ensure the folders are open
1492: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1493: my $curRes;
1494: my $found = 0;
1495:
1496: # We only need to do this if we need to open the maps to show the
1497: # current position. This will change the counter so we can't count
1498: # for the jump marker with this loop.
1499: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1500: if (ref($curRes) && $curRes->symb() eq $here) {
1501: my $mapStack = $mapIterator->getStack();
1502:
1503: # Ensure the parent maps are open
1504: for my $map (@{$mapStack}) {
1505: if ($condition) {
1506: undef $filterHash->{$map->map_pc()};
1507: } else {
1508: $filterHash->{$map->map_pc()} = 1;
1509: }
1510: }
1511: $found = 1;
1512: }
1513: }
1514: }
1515:
1516: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1517: # If this is a click on a folder or something, we want to preserve the "here"
1518: # from the querystring, and get the new "jump" marker
1519: $here = $env{'form.here'};
1520: $jump = $env{'form.jump'};
1521: }
1522:
1523: my $it = $args->{'iterator'};
1524: if (!defined($it)) {
1525: # Construct a default iterator based on $env{'form.'} information
1526:
1527: # Step 1: Check to see if we have a navmap
1528: if (!defined($navmap)) {
1529: $navmap = Apache::lonnavmaps::navmap->new();
1530: }
1531:
1532: # See if we're being passed a specific map
1533: if ($args->{'iterator_map'}) {
1534: my $map = $args->{'iterator_map'};
1535: $map = $navmap->getResourceByUrl($map);
1536: my $firstResource = $map->map_start();
1537: my $finishResource = $map->map_finish();
1538:
1539: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1540: } else {
1541: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1542: }
1543: }
1544:
1545: # (re-)Locate the jump point, if any
1546: # Note this does not take filtering or hidden into account... need
1547: # to be fixed?
1548: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1549: my $curRes;
1550: my $foundJump = 0;
1551: my $counter = 0;
1552:
1553: while (($curRes = $mapIterator->next()) && !$foundJump) {
1554: if (ref($curRes)) { $counter++; }
1555:
1556: if (ref($curRes) && $jump eq $curRes->symb()) {
1557:
1558: # This is why we have to use the main iterator instead of the
1559: # potentially faster DFS: The count has to be the same, so
1560: # the order has to be the same, which DFS won't give us.
1561: $args->{'currentJumpIndex'} = $counter;
1562: $foundJump = 1;
1563: }
1564: }
1565:
1566: my $showParts = setDefault($args->{'showParts'}, 1);
1567: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1568: # keeps track of when the current resource is found,
1569: # so we can back up a few and put the anchor above the
1570: # current resource
1571: my $printKey = $args->{'printKey'};
1572: my $printCloseAll = $args->{'printCloseAll'};
1573: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1574:
1575: # Print key?
1576: if ($printKey) {
1577: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1578: my $date=localtime;
1579: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1580: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1581: if ($navmap->{LAST_CHECK}) {
1582: $result .=
1583: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1584: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1585: '</td><td align="center" valign="bottom"> '.
1586: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1587: '</td>';
1588: } else {
1589: $result .= '<td align="center" valign="bottom"> '.
1590: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1591: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1592: '</td>';
1593: }
1594:
1595: $result .= '</tr></table>';
1596: }
1597:
1598: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1599: my ($link,$text);
1600: if ($condition) {
1601: $link='"navmaps?condition=0&filter=&'.$queryString.
1602: '&here='.&Apache::lonnet::escape($here).'"';
1603: $text='Close All Folders';
1604: } else {
1605: $link='"navmaps?condition=1&filter=&'.$queryString.
1606: '&here='.&Apache::lonnet::escape($here).'"';
1607: $text='Open All Folders';
1608: }
1609: if ($args->{'caller'} eq 'navmapsdisplay') {
1610: &add_linkitem($args->{'linkitems'},'changefolder',
1611: 'location.href='.$link,$text);
1612: } else {
1613: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1614: }
1615: $result .= "\n";
1616: }
1617:
1618: # Check for any unread discussions in all resources.
1619: if ($args->{'caller'} eq 'navmapsdisplay') {
1620: &add_linkitem($args->{'linkitems'},'clearbubbles',
1621: 'document.clearbubbles.submit()',
1622: 'Mark all posts read');
1623: my $time=time;
1624: $result .= (<<END);
1625: <form name="clearbubbles" method="post" action="/adm/feedback">
1626: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1627: <input type="hidden" name="navtime" value="$time" />
1628: END
1629: if ($args->{'sort'} eq 'discussion') {
1630: my $totdisc = 0;
1631: my $haveDisc = '';
1632: my @allres=$navmap->retrieveResources();
1633: foreach my $resource (@allres) {
1634: if ($resource->hasDiscussion()) {
1635: $haveDisc .= $resource->wrap_symb().':';
1636: $totdisc ++;
1637: }
1638: }
1639: if ($totdisc > 0) {
1640: $haveDisc =~ s/:$//;
1641: $result .= (<<END);
1642: <input type="hidden" name="navmaps" value="$haveDisc" />
1643: </form>
1644: END
1645: }
1646: }
1647: $result.='</form>';
1648: }
1649:
1650: if ($args->{'caller'} eq 'navmapsdisplay') {
1651: $result .= '<table><tr><td>'.
1652: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1653: if ($env{'environment.remotenavmap'} ne 'on') {
1654: $result .= '<td> </td>';
1655: } else {
1656: $result .= '</tr><tr>';
1657: }
1658: $result.=&show_linkitems($args->{'linkitems'});
1659: if ($args->{'sort_html'}) {
1660: if ($env{'environment.remotenavmap'} ne 'on') {
1661: $result.='<td> </td><td> </td><td> </td>'.
1662: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1663: } else {
1664: $result.='</tr><tr><td align="left"><br />'.
1665: $args->{'sort_html'}.'</td></tr>';
1666: }
1667: }
1668: $result .= '</table>';
1669: } elsif ($args->{'sort_html'}) {
1670: $result.=$args->{'sort_html'};
1671: }
1672:
1673: $result .= "<br />\n";
1674: if ($r) {
1675: $r->print($result);
1676: $r->rflush();
1677: $result = "";
1678: }
1679: # End parameter setting
1680:
1681: # Data
1682: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1683: my $res = "Apache::lonnavmaps::resource";
1684: my %condenseStatuses =
1685: ( $res->NETWORK_FAILURE => 1,
1686: $res->NOTHING_SET => 1,
1687: $res->CORRECT => 1 );
1688: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1689:
1690: # Shared variables
1691: $args->{'counter'} = 0; # counts the rows
1692: $args->{'indentLevel'} = 0;
1693: $args->{'isNewBranch'} = 0;
1694: $args->{'condensed'} = 0;
1695: my $location=
1696: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1697: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1698: $args->{'displayedHereMarker'} = 0;
1699:
1700: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1701: # since structure actually doesn't matter, except what map has what resources.
1702: if ($args->{'suppressEmptySequences'}) {
1703: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1704: $it->{FIRST_RESOURCE},
1705: $it->{FINISH_RESOURCE},
1706: {}, undef, 1);
1707: my $depth = 0;
1708: $dfsit->next();
1709: my $curRes = $dfsit->next();
1710: while ($depth > -1) {
1711: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1712: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1713:
1714: if (ref($curRes)) {
1715: # Parallel pre-processing: Do sequences have non-filtered-out children?
1716: if ($curRes->is_map()) {
1717: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1718: # Sequences themselves do not count as visible children,
1719: # unless those sequences also have visible children.
1720: # This means if a sequence appears, there's a "promise"
1721: # that there's something under it if you open it, somewhere.
1722: } else {
1723: # Not a sequence: if it's filtered, ignore it, otherwise
1724: # rise up the stack and mark the sequences as having children
1725: if (&$filterFunc($curRes)) {
1726: for my $sequence (@{$dfsit->getStack()}) {
1727: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1728: }
1729: }
1730: }
1731: }
1732: } continue {
1733: $curRes = $dfsit->next();
1734: }
1735: }
1736:
1737: my $displayedJumpMarker = 0;
1738: # Set up iteration.
1739: my $now = time();
1740: my $in24Hours = $now + 24 * 60 * 60;
1741: my $rownum = 0;
1742:
1743: # export "here" marker information
1744: $args->{'here'} = $here;
1745:
1746: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1747: my @resources;
1748: my $code='';# sub { !(shift->is_map();) };
1749: if ($args->{'sort'} eq 'title') {
1750: my $oldFilterFunc = $filterFunc;
1751: my $filterFunc=
1752: sub {
1753: my ($res)=@_;
1754: if ($res->is_map()) { return 0;}
1755: return &$oldFilterFunc($res);
1756: };
1757: @resources=$navmap->retrieveResources(undef,$filterFunc);
1758: @resources= sort { &cmp_title($a,$b) } @resources;
1759: } elsif ($args->{'sort'} eq 'duedate') {
1760: my $oldFilterFunc = $filterFunc;
1761: my $filterFunc=
1762: sub {
1763: my ($res)=@_;
1764: if (!$res->is_problem()) { return 0;}
1765: return &$oldFilterFunc($res);
1766: };
1767: @resources=$navmap->retrieveResources(undef,$filterFunc);
1768: @resources= sort {
1769: if ($a->duedate ne $b->duedate) {
1770: return $a->duedate cmp $b->duedate;
1771: }
1772: my $value=&cmp_title($a,$b);
1773: return $value;
1774: } @resources;
1775: } elsif ($args->{'sort'} eq 'discussion') {
1776: my $oldFilterFunc = $filterFunc;
1777: my $filterFunc=
1778: sub {
1779: my ($res)=@_;
1780: if (!$res->hasDiscussion() &&
1781: !$res->getFeedback() &&
1782: !$res->getErrors()) { return 0;}
1783: return &$oldFilterFunc($res);
1784: };
1785: @resources=$navmap->retrieveResources(undef,$filterFunc);
1786: @resources= sort { &cmp_title($a,$b) } @resources;
1787: } else {
1788: #unknow sort mechanism or default
1789: undef($args->{'sort'});
1790: }
1791:
1792:
1793: while (1) {
1794: if ($args->{'sort'}) {
1795: $curRes = shift(@resources);
1796: } else {
1797: $curRes = $it->next($closeAllPages);
1798: }
1799: if (!$curRes) { last; }
1800:
1801: # Maintain indentation level.
1802: if ($curRes == $it->BEGIN_MAP() ||
1803: $curRes == $it->BEGIN_BRANCH() ) {
1804: $args->{'indentLevel'}++;
1805: }
1806: if ($curRes == $it->END_MAP() ||
1807: $curRes == $it->END_BRANCH() ) {
1808: $args->{'indentLevel'}--;
1809: }
1810: # Notice new branches
1811: if ($curRes == $it->BEGIN_BRANCH()) {
1812: $args->{'isNewBranch'} = 1;
1813: }
1814:
1815: # If this isn't an actual resource, continue on
1816: if (!ref($curRes)) {
1817: next;
1818: }
1819:
1820: # If this has been filtered out, continue on
1821: if (!(&$filterFunc($curRes))) {
1822: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1823: next;
1824: }
1825:
1826: # If this is an empty sequence and we're filtering them, continue on
1827: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1828: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1829: next;
1830: }
1831:
1832: # If we're suppressing navmaps and this is a navmap, continue on
1833: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1834: next;
1835: }
1836:
1837: $args->{'counter'}++;
1838:
1839: # Does it have multiple parts?
1840: $args->{'multipart'} = 0;
1841: $args->{'condensed'} = 0;
1842: my @parts;
1843:
1844: # Decide what parts to show.
1845: if ($curRes->is_problem() && $showParts) {
1846: @parts = @{$curRes->parts()};
1847: $args->{'multipart'} = $curRes->multipart();
1848:
1849: if ($condenseParts) { # do the condensation
1850: if (!$args->{'condensed'}) {
1851: # Decide whether to condense based on similarity
1852: my $status = $curRes->status($parts[0]);
1853: my $due = $curRes->duedate($parts[0]);
1854: my $open = $curRes->opendate($parts[0]);
1855: my $statusAllSame = 1;
1856: my $dueAllSame = 1;
1857: my $openAllSame = 1;
1858: for (my $i = 1; $i < scalar(@parts); $i++) {
1859: if ($curRes->status($parts[$i]) != $status){
1860: $statusAllSame = 0;
1861: }
1862: if ($curRes->duedate($parts[$i]) != $due ) {
1863: $dueAllSame = 0;
1864: }
1865: if ($curRes->opendate($parts[$i]) != $open) {
1866: $openAllSame = 0;
1867: }
1868: }
1869: # $*allSame is true if all the statuses were
1870: # the same. Now, if they are all the same and
1871: # match one of the statuses to condense, or they
1872: # are all open with the same due date, or they are
1873: # all OPEN_LATER with the same open date, display the
1874: # status of the first non-zero part (to get the 'correct'
1875: # status right, since 0 is never 'correct' or 'open').
1876: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1877: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1878: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1879: @parts = ($parts[0]);
1880: $args->{'condensed'} = 1;
1881: }
1882: }
1883: # Multipart problem with one part: always "condense" (happens
1884: # to match the desirable behavior)
1885: if ($curRes->countParts() == 1) {
1886: @parts = ($parts[0]);
1887: $args->{'condensed'} = 1;
1888: }
1889: }
1890: }
1891:
1892: # If the multipart problem was condensed, "forget" it was multipart
1893: if (scalar(@parts) == 1) {
1894: $args->{'multipart'} = 0;
1895: } else {
1896: # Add part 0 so we display it correctly.
1897: unshift @parts, '0';
1898: }
1899:
1900: {
1901: my ($src,$symb,$anchor,$stack);
1902: if ($args->{'sort'}) {
1903: my $it = $navmap->getIterator(undef, undef, undef, 1);
1904: while ( my $res=$it->next()) {
1905: if (ref($res) &&
1906: $res->symb() eq $curRes->symb()) { last; }
1907: }
1908: $stack=$it->getStack();
1909: } else {
1910: $stack=$it->getStack();
1911: }
1912: ($src,$symb,$anchor)=getLinkForResource($stack);
1913: if (defined($anchor)) { $anchor='#'.$anchor; }
1914: my $srcHasQuestion = $src =~ /\?/;
1915: $args->{"resourceLink"} = $src.
1916: ($srcHasQuestion?'&':'?') .
1917: 'symb=' . &Apache::lonnet::escape($symb).$anchor;
1918: }
1919: # Now, we've decided what parts to show. Loop through them and
1920: # show them.
1921: foreach my $part (@parts) {
1922: $rownum ++;
1923: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1924:
1925: $result .= " <tr bgcolor='$backgroundColor'>\n";
1926:
1927: # Set up some data about the parts that the cols might want
1928: my $filter = $it->{FILTER};
1929:
1930: # Now, display each column.
1931: foreach my $col (@$cols) {
1932: my $colHTML = '';
1933: if (ref($col)) {
1934: $colHTML .= &$col($curRes, $part, $args);
1935: } else {
1936: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1937: }
1938:
1939: # If this is the first column and it's time to print
1940: # the anchor, do so
1941: if ($col == $cols->[0] &&
1942: $args->{'counter'} == $args->{'currentJumpIndex'} -
1943: $currentJumpDelta) {
1944: # Jam the anchor after the <td> tag;
1945: # necessary for valid HTML (which Mozilla requires)
1946: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1947: $displayedJumpMarker = 1;
1948: }
1949: $result .= $colHTML . "\n";
1950: }
1951: $result .= " </tr>\n";
1952: $args->{'isNewBranch'} = 0;
1953: }
1954:
1955: if ($r && $rownum % 20 == 0) {
1956: $r->print($result);
1957: $result = "";
1958: $r->rflush();
1959: }
1960: } continue {
1961: if ($r) {
1962: # If we have the connection, make sure the user is still connected
1963: my $c = $r->connection;
1964: if ($c->aborted()) {
1965: # Who cares what we do, nobody will see it anyhow.
1966: return '';
1967: }
1968: }
1969: }
1970:
1971: # Print out the part that jumps to #curloc if it exists
1972: # delay needed because the browser is processing the jump before
1973: # it finishes rendering, so it goes to the wrong place!
1974: # onload might be better, but this routine has no access to that.
1975: # On mozilla, the 0-millisecond timeout seems to prevent this;
1976: # it's quite likely this might fix other browsers, too, and
1977: # certainly won't hurt anything.
1978: if ($displayedJumpMarker) {
1979: $result .= "
1980: <script>
1981: if (location.href.indexOf('#curloc')==-1) {
1982: setTimeout(\"location += '#curloc';\", 0)
1983: }
1984: </script>";
1985: }
1986:
1987: $result .= "</table>";
1988:
1989: if ($r) {
1990: $r->print($result);
1991: $result = "";
1992: $r->rflush();
1993: }
1994:
1995: return $result;
1996: }
1997:
1998: sub add_linkitem {
1999: my ($linkitems,$name,$cmd,$text)=@_;
2000: $$linkitems{$name}{'cmd'}=$cmd;
2001: $$linkitems{$name}{'text'}=&mt($text);
2002: }
2003:
2004: sub show_linkitems {
2005: my ($linkitems)=@_;
2006: my @linkorder = ("blank","launchnav","closenav","firsthomework",
2007: "everything","uncompleted","changefolder","clearbubbles");
2008:
2009: my $result .= (<<ENDBLOCK);
2010: <td align="left">
2011: <script type="text/javascript">
2012: function changeNavDisplay () {
2013: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
2014: ENDBLOCK
2015: foreach my $link (@linkorder) {
2016: $result.= "if (navchoice == '$link') {".
2017: $linkitems->{$link}{'cmd'}."}\n";
2018: }
2019: $result.='}
2020: </script>
2021: <form name="linkitems" method="post">
2022: <nobr><select name="toplink">'."\n";
2023: foreach my $link (@linkorder) {
2024: if (defined($linkitems->{$link})) {
2025: if ($linkitems->{$link}{'text'} ne '') {
2026: $result .= ' <option value="'.$link.'">'.
2027: $linkitems->{$link}{'text'}."</option>\n";
2028: }
2029: }
2030: }
2031: $result .= '</select> <input type="button" name="chgnav"
2032: value="Go" onClick="javascript:changeNavDisplay()" />
2033: </nobr></form></td>'."\n";
2034:
2035: return $result;
2036: }
2037:
2038: 1;
2039:
2040: package Apache::lonnavmaps::navmap;
2041:
2042: =pod
2043:
2044: =head1 Object: Apache::lonnavmaps::navmap
2045:
2046: =head2 Overview
2047:
2048: The navmap object's job is to provide access to the resources
2049: in the course as Apache::lonnavmaps::resource objects, and to
2050: query and manage the relationship between those resource objects.
2051:
2052: Generally, you'll use the navmap object in one of three basic ways.
2053: In order of increasing complexity and power:
2054:
2055: =over 4
2056:
2057: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
2058: various ways to obtain resource objects, based on various identifiers.
2059: Use this when you want to request information about one object or
2060: a handful of resources you already know the identities of, from some
2061: other source. For more about Ids, Symbs, and MapPcs, see the
2062: Resource documentation. Note that Url should be a B<last resort>,
2063: not your first choice; it only works when there is only one
2064: instance of the resource in the course, which only applies to
2065: maps, and even that may change in the future.
2066:
2067: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2068: retrieves resources matching some criterion and returns them
2069: in a flat array, with no structure information. Use this when
2070: you are manipulating a series of resources, based on what map
2071: the are in, but do not care about branching, or exactly how
2072: the maps and resources are related. This is the most common case.
2073:
2074: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2075: the course's navmap in various ways without writing the traversal
2076: code yourself. See iterator documentation below. Use this when
2077: you need to know absolutely everything about the course, including
2078: branches and the precise relationship between maps and resources.
2079:
2080: =back
2081:
2082: =head2 Creation And Destruction
2083:
2084: To create a navmap object, use the following function:
2085:
2086: =over 4
2087:
2088: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2089:
2090: Creates a new navmap object. Returns the navmap object if this is
2091: successful, or B<undef> if not.
2092:
2093: =back
2094:
2095: =head2 Methods
2096:
2097: =over 4
2098:
2099: =item * B<getIterator>(first, finish, filter, condition):
2100:
2101: See iterator documentation below.
2102:
2103: =cut
2104:
2105: use strict;
2106: use GDBM_File;
2107: use Apache::lonnet;
2108:
2109: sub new {
2110: # magic invocation to create a class instance
2111: my $proto = shift;
2112: my $class = ref($proto) || $proto;
2113: my $self = {};
2114:
2115: # Resource cache stores navmap resources as we reference them. We generate
2116: # them on-demand so we don't pay for creating resources unless we use them.
2117: $self->{RESOURCE_CACHE} = {};
2118:
2119: # Network failure flag, if we accessed the course or user opt and
2120: # failed
2121: $self->{NETWORK_FAILURE} = 0;
2122:
2123: # tie the nav hash
2124:
2125: my %navmaphash;
2126: my %parmhash;
2127: my $courseFn = $env{"request.course.fn"};
2128: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2129: &GDBM_READER(), 0640))) {
2130: return undef;
2131: }
2132:
2133: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2134: &GDBM_READER(), 0640)))
2135: {
2136: untie %{$self->{PARM_HASH}};
2137: return undef;
2138: }
2139:
2140: $self->{NAV_HASH} = \%navmaphash;
2141: $self->{PARM_HASH} = \%parmhash;
2142: $self->{PARM_CACHE} = {};
2143:
2144: bless($self);
2145:
2146: return $self;
2147: }
2148:
2149: sub generate_course_user_opt {
2150: my $self = shift;
2151: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2152:
2153: my $uname=$env{'user.name'};
2154: my $udom=$env{'user.domain'};
2155: my $cid=$env{'request.course.id'};
2156: my $cdom=$env{'course.'.$cid.'.domain'};
2157: my $cnum=$env{'course.'.$cid.'.num'};
2158:
2159: # ------------------------------------------------- Get coursedata (if present)
2160: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2161: # Check for network failure
2162: if (!ref($courseopt)) {
2163: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2164: $self->{NETWORK_FAILURE} = 1;
2165: }
2166: undef($courseopt);
2167: }
2168:
2169: # --------------------------------------------------- Get userdata (if present)
2170:
2171: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2172: # Check for network failure
2173: if (!ref($useropt)) {
2174: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2175: $self->{NETWORK_FAILURE} = 1;
2176: }
2177: undef($useropt);
2178: }
2179:
2180: $self->{COURSE_OPT} = $courseopt;
2181: $self->{USER_OPT} = $useropt;
2182:
2183: $self->{COURSE_USER_OPT_GENERATED} = 1;
2184:
2185: return;
2186: }
2187:
2188: sub generate_email_discuss_status {
2189: my $self = shift;
2190: my $symb = shift;
2191: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2192:
2193: my $cid=$env{'request.course.id'};
2194: my $cdom=$env{'course.'.$cid.'.domain'};
2195: my $cnum=$env{'course.'.$cid.'.num'};
2196:
2197: my %emailstatus = &Apache::lonnet::dump('email_status');
2198: my $logoutTime = $emailstatus{'logout'};
2199: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2200: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2201: $courseLeaveTime : $logoutTime);
2202: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2203: $cdom, $cnum);
2204: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2205: $env{'user.domain'},$env{'user.name'},'lastread');
2206: my %lastreadtime = ();
2207: foreach (keys %lastread) {
2208: my $key = $_;
2209: $key =~ s/_lastread$//;
2210: $lastreadtime{$key} = $lastread{$_};
2211: }
2212:
2213: my %feedback=();
2214: my %error=();
2215: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2216: $env{'user.name'});
2217:
2218: foreach my $msgid (@keys) {
2219: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2220: my $plain=
2221: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2222: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2223: my ($what,$url)=($1,$2);
2224: if ($what eq 'Error') {
2225: $error{$url}.=','.$msgid;
2226: } else {
2227: $feedback{$url}.=','.$msgid;
2228: }
2229: }
2230: }
2231: }
2232:
2233: #url's of resources that have feedbacks
2234: $self->{FEEDBACK} = \%feedback;
2235: #or errors
2236: $self->{ERROR_MSG} = \%error;
2237: $self->{DISCUSSION_TIME} = \%discussiontime;
2238: $self->{EMAIL_STATUS} = \%emailstatus;
2239: $self->{LAST_READ} = \%lastreadtime;
2240:
2241: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2242: }
2243:
2244: sub get_user_data {
2245: my $self = shift;
2246: if ($self->{RETRIEVED_USER_DATA}) { return; }
2247:
2248: # Retrieve performance data on problems
2249: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2250: $env{'user.domain'},
2251: $env{'user.name'});
2252: $self->{STUDENT_DATA} = \%student_data;
2253:
2254: $self->{RETRIEVED_USER_DATA} = 1;
2255: }
2256:
2257: # Internal function: Takes a key to look up in the nav hash and implements internal
2258: # memory caching of that key.
2259: sub navhash {
2260: my $self = shift; my $key = shift;
2261: return $self->{NAV_HASH}->{$key};
2262: }
2263:
2264: =pod
2265:
2266: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2267: false otherwise. Undefined course maps indicate an error somewhere in
2268: LON-CAPA, and you will not be able to proceed with using the navmap.
2269: See the B<NAV> screen for an example of using this.
2270:
2271: =cut
2272:
2273: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2274: sub courseMapDefined {
2275: my $self = shift;
2276: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2277:
2278: my $firstres = $self->navhash("map_start_$uri");
2279: my $lastres = $self->navhash("map_finish_$uri");
2280: return $firstres && $lastres;
2281: }
2282:
2283: sub getIterator {
2284: my $self = shift;
2285: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2286: shift, undef, shift,
2287: shift, shift);
2288: return $iterator;
2289: }
2290:
2291: # Private method: Does the given resource (as a symb string) have
2292: # current discussion? Returns 0 if chat/mail data not extracted.
2293: sub hasDiscussion {
2294: my $self = shift;
2295: my $symb = shift;
2296: $self->generate_email_discuss_status();
2297:
2298: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2299:
2300: #return defined($self->{DISCUSSION_TIME}->{$symb});
2301:
2302: # backward compatibility (bulletin boards used to be 'wrapped')
2303: my $ressymb = $self->wrap_symb($symb);
2304: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2305: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2306: } else {
2307: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2308: 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).
2309: }
2310: }
2311:
2312: sub wrap_symb {
2313: my $self = shift;
2314: my $symb = shift;
2315: if ($symb =~ m-___(adm/\w+/\w+/)(\d+)(/bulletinboard)$-) {
2316: unless ($symb =~ m|adm/wrapper/adm|) {
2317: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2318: }
2319: }
2320: return $symb;
2321: }
2322:
2323: # Private method: Does the given resource (as a symb string) have
2324: # current feedback? Returns the string in the feedback hash, which
2325: # will be false if it does not exist.
2326:
2327: sub getFeedback {
2328: my $self = shift;
2329: my $symb = shift;
2330:
2331: $self->generate_email_discuss_status();
2332:
2333: if (!defined($self->{FEEDBACK})) { return ""; }
2334:
2335: return $self->{FEEDBACK}->{$symb};
2336: }
2337:
2338: # Private method: Get the errors for that resource (by source).
2339: sub getErrors {
2340: my $self = shift;
2341: my $src = shift;
2342:
2343: $self->generate_email_discuss_status();
2344:
2345: if (!defined($self->{ERROR_MSG})) { return ""; }
2346: return $self->{ERROR_MSG}->{$src};
2347: }
2348:
2349: =pod
2350:
2351: =item * B<getById>(id):
2352:
2353: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2354: object for that resource. This method, or other methods that use it
2355: (as in the resource object) is the only proper way to obtain a
2356: resource object.
2357:
2358: =item * B<getBySymb>(symb):
2359:
2360: Based on the symb of the resource, get a resource object for that
2361: resource. This is one of the proper ways to get a resource object.
2362:
2363: =item * B<getMapByMapPc>(map_pc):
2364:
2365: Based on the map_pc of the resource, get a resource object for
2366: the given map. This is one of the proper ways to get a resource object.
2367:
2368: =cut
2369:
2370: # The strategy here is to cache the resource objects, and only construct them
2371: # as we use them. The real point is to prevent reading any more from the tied
2372: # hash then we have to, which should hopefully alleviate speed problems.
2373:
2374: sub getById {
2375: my $self = shift;
2376: my $id = shift;
2377:
2378: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2379: {
2380: return $self->{RESOURCE_CACHE}->{$id};
2381: }
2382:
2383: # resource handles inserting itself into cache.
2384: # Not clear why the quotes are necessary, but as of this
2385: # writing it doesn't work without them.
2386: return "Apache::lonnavmaps::resource"->new($self, $id);
2387: }
2388:
2389: sub getBySymb {
2390: my $self = shift;
2391: my $symb = shift;
2392:
2393: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2394: my $map = $self->getResourceByUrl($mapUrl);
2395: my $returnvalue = undef;
2396: if (ref($map)) {
2397: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2398: }
2399: return $returnvalue;
2400: }
2401:
2402: sub getByMapPc {
2403: my $self = shift;
2404: my $map_pc = shift;
2405: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2406: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2407: return $self->getById($map_id);
2408: }
2409:
2410: =pod
2411:
2412: =item * B<firstResource>():
2413:
2414: Returns a resource object reference corresponding to the first
2415: resource in the navmap.
2416:
2417: =cut
2418:
2419: sub firstResource {
2420: my $self = shift;
2421: my $firstResource = $self->navhash('map_start_' .
2422: &Apache::lonnet::clutter($env{'request.course.uri'}));
2423: return $self->getById($firstResource);
2424: }
2425:
2426: =pod
2427:
2428: =item * B<finishResource>():
2429:
2430: Returns a resource object reference corresponding to the last resource
2431: in the navmap.
2432:
2433: =cut
2434:
2435: sub finishResource {
2436: my $self = shift;
2437: my $firstResource = $self->navhash('map_finish_' .
2438: &Apache::lonnet::clutter($env{'request.course.uri'}));
2439: return $self->getById($firstResource);
2440: }
2441:
2442: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2443: # the actual lookup; parmval caches the results.
2444: sub parmval {
2445: my $self = shift;
2446: my ($what,$symb)=@_;
2447: my $hashkey = $what."|||".$symb;
2448:
2449: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2450: return $self->{PARM_CACHE}->{$hashkey};
2451: }
2452:
2453: my $result = $self->parmval_real($what, $symb);
2454: $self->{PARM_CACHE}->{$hashkey} = $result;
2455: return $result;
2456: }
2457:
2458: sub parmval_real {
2459: my $self = shift;
2460: my ($what,$symb,$recurse) = @_;
2461:
2462: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2463: $self->generate_course_user_opt();
2464:
2465: my $cid=$env{'request.course.id'};
2466: my $csec=$env{'request.course.sec'};
2467: my $uname=$env{'user.name'};
2468: my $udom=$env{'user.domain'};
2469:
2470: unless ($symb) { return ''; }
2471: my $result='';
2472:
2473: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2474:
2475: # ----------------------------------------------------- Cascading lookup scheme
2476: my $rwhat=$what;
2477: $what=~s/^parameter\_//;
2478: $what=~s/\_/\./;
2479:
2480: my $symbparm=$symb.'.'.$what;
2481: my $mapparm=$mapname.'___(all).'.$what;
2482: my $usercourseprefix=$cid;
2483:
2484: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2485: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2486: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2487:
2488: my $courselevel= $usercourseprefix.'.'.$what;
2489: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2490: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2491:
2492: my $useropt = $self->{USER_OPT};
2493: my $courseopt = $self->{COURSE_OPT};
2494: my $parmhash = $self->{PARM_HASH};
2495:
2496: # ---------------------------------------------------------- first, check user
2497: if ($uname and defined($useropt)) {
2498: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2499: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2500: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2501: }
2502:
2503: # ------------------------------------------------------- second, check course
2504: if ($csec and defined($courseopt)) {
2505: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2506: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2507: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2508: }
2509:
2510: if (defined($courseopt)) {
2511: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2512: }
2513:
2514: # ----------------------------------------------------- third, check map parms
2515:
2516: my $thisparm=$$parmhash{$symbparm};
2517: if (defined($thisparm)) { return $thisparm; }
2518:
2519: # ----------------------------------------------------- fourth , check default
2520:
2521: my $meta_rwhat=$rwhat;
2522: $meta_rwhat=~s/\./_/g;
2523: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2524: if (defined($default)) { return $default}
2525: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2526: if (defined($default)) { return $default}
2527:
2528: # --------------------------------------------------- fifth, check more course
2529: if (defined($courseopt)) {
2530: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2531: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2532: }
2533:
2534: # --------------------------------------------------- sixth , cascade up parts
2535:
2536: my ($space,@qualifier)=split(/\./,$rwhat);
2537: my $qualifier=join('.',@qualifier);
2538: unless ($space eq '0') {
2539: my @parts=split(/_/,$space);
2540: my $id=pop(@parts);
2541: my $part=join('_',@parts);
2542: if ($part eq '') { $part='0'; }
2543: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2544: if (defined($partgeneral)) { return $partgeneral; }
2545: }
2546: if ($recurse) { return undef; }
2547: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2548: if (defined($pack_def)) { return $pack_def; }
2549: return '';
2550: }
2551:
2552: =pod
2553:
2554: =item * B<getResourceByUrl>(url):
2555:
2556: Retrieves a resource object by URL of the resource. If passed a
2557: resource object, it will simply return it, so it is safe to use this
2558: method in code like "$res = $navmap->getResourceByUrl($res)", if
2559: you're not sure if $res is already an object, or just a URL. If the
2560: resource appears multiple times in the course, only the first instance
2561: will be returned. As a result, this is probably useful only for maps.
2562:
2563: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2564:
2565: The map is a specification of a map to retreive the resources from,
2566: either as a url or as an object. The filterFunc is a reference to a
2567: function that takes a resource object as its one argument and returns
2568: true if the resource should be included, or false if it should not
2569: be. If recursive is true, the map will be recursively examined,
2570: otherwise it will not be. If bailout is true, the function will return
2571: as soon as it finds a resource, if false it will finish. If showall is
2572: true it will not hide maps that contain nothing but one other map. By
2573: default, the map is the top-level map of the course, filterFunc is a
2574: function that always returns 1, recursive is true, bailout is false,
2575: showall is false. The resources will be returned in a list containing
2576: the resource objects for the corresponding resources, with B<no
2577: structure information> in the list; regardless of branching,
2578: recursion, etc., it will be a flat list.
2579:
2580: Thus, this is suitable for cases where you don't want the structure,
2581: just a list of all resources. It is also suitable for finding out how
2582: many resources match a given description; for this use, if all you
2583: want to know is if I<any> resources match the description, the bailout
2584: parameter will allow you to avoid potentially expensive enumeration of
2585: all matching resources.
2586:
2587: =item * B<hasResource>(map, filterFunc, recursive, showall):
2588:
2589: Convience method for
2590:
2591: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2592:
2593: which will tell whether the map has resources matching the description
2594: in the filter function.
2595:
2596: =cut
2597:
2598:
2599: sub getResourceByUrl {
2600: my $self = shift;
2601: my $resUrl = shift;
2602:
2603: if (ref($resUrl)) { return $resUrl; }
2604:
2605: $resUrl = &Apache::lonnet::clutter($resUrl);
2606: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2607: if ($resId =~ /,/) {
2608: $resId = (split (/,/, $resId))[0];
2609: }
2610: if (!$resId) { return ''; }
2611: return $self->getById($resId);
2612: }
2613:
2614: sub retrieveResources {
2615: my $self = shift;
2616: my $map = shift;
2617: my $filterFunc = shift;
2618: if (!defined ($filterFunc)) {
2619: $filterFunc = sub {return 1;};
2620: }
2621: my $recursive = shift;
2622: if (!defined($recursive)) { $recursive = 1; }
2623: my $bailout = shift;
2624: if (!defined($bailout)) { $bailout = 0; }
2625: my $showall = shift;
2626: # Create the necessary iterator.
2627: if (!ref($map)) { # assume it's a url of a map.
2628: $map = $self->getResourceByUrl($map);
2629: }
2630:
2631: # If nothing was passed, assume top-level map
2632: if (!$map) {
2633: $map = $self->getById('0.0');
2634: }
2635:
2636: # Check the map's validity.
2637: if (!$map->is_map()) {
2638: # Oh, to throw an exception.... how I'd love that!
2639: return ();
2640: }
2641:
2642: # Get an iterator.
2643: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2644: undef, $recursive, $showall);
2645:
2646: my @resources = ();
2647:
2648: # Run down the iterator and collect the resources.
2649: my $curRes;
2650:
2651: while ($curRes = $it->next()) {
2652: if (ref($curRes)) {
2653: if (!&$filterFunc($curRes)) {
2654: next;
2655: }
2656:
2657: push @resources, $curRes;
2658:
2659: if ($bailout) {
2660: return @resources;
2661: }
2662: }
2663:
2664: }
2665:
2666: return @resources;
2667: }
2668:
2669: sub hasResource {
2670: my $self = shift;
2671: my $map = shift;
2672: my $filterFunc = shift;
2673: my $recursive = shift;
2674: my $showall = shift;
2675:
2676: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2677: }
2678:
2679: 1;
2680:
2681: package Apache::lonnavmaps::iterator;
2682: use WeakRef;
2683: use Apache::lonnet;
2684:
2685: =pod
2686:
2687: =back
2688:
2689: =head1 Object: navmap Iterator
2690:
2691: An I<iterator> encapsulates the logic required to traverse a data
2692: structure. navmap uses an iterator to traverse the course map
2693: according to the criteria you wish to use.
2694:
2695: To obtain an iterator, call the B<getIterator>() function of a
2696: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2697: directly.) This will return a reference to the iterator:
2698:
2699: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2700:
2701: To get the next thing from the iterator, call B<next>:
2702:
2703: C<my $nextThing = $resourceIterator-E<gt>next()>
2704:
2705: getIterator behaves as follows:
2706:
2707: =over 4
2708:
2709: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2710:
2711: All parameters are optional. firstResource is a resource reference
2712: corresponding to where the iterator should start. It defaults to
2713: navmap->firstResource() for the corresponding nav map. finishResource
2714: corresponds to where you want the iterator to end, defaulting to
2715: navmap->finishResource(). filterHash is a hash used as a set
2716: containing strings representing the resource IDs, defaulting to
2717: empty. Condition is a 1 or 0 that sets what to do with the filter
2718: hash: If a 0, then only resources that exist IN the filterHash will be
2719: recursed on. If it is a 1, only resources NOT in the filterHash will
2720: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2721: false (default), the iterator will only return the first level of map
2722: that is not just a single, 'redirecting' map. If true, the iterator
2723: will return all information, starting with the top-level map,
2724: regardless of content. returnTopMap, if true (default false), will
2725: cause the iterator to return the top-level map object (resource 0.0)
2726: before anything else.
2727:
2728: Thus, by default, only top-level resources will be shown. Change the
2729: condition to a 1 without changing the hash, and all resources will be
2730: shown. Changing the condition to 1 and including some values in the
2731: hash will allow you to selectively suppress parts of the navmap, while
2732: leaving it on 0 and adding things to the hash will allow you to
2733: selectively add parts of the nav map. See the handler code for
2734: examples.
2735:
2736: The iterator will return either a reference to a resource object, or a
2737: token representing something in the map, such as the beginning of a
2738: new branch. The possible tokens are:
2739:
2740: =over 4
2741:
2742: =item * B<END_ITERATOR>:
2743:
2744: The iterator has returned all that it's going to. Further calls to the
2745: iterator will just produce more of these. This is a "false" value, and
2746: is the only false value the iterator which will be returned, so it can
2747: be used as a loop sentinel.
2748:
2749: =item * B<BEGIN_MAP>:
2750:
2751: A new map is being recursed into. This is returned I<after> the map
2752: resource itself is returned.
2753:
2754: =item * B<END_MAP>:
2755:
2756: The map is now done.
2757:
2758: =item * B<BEGIN_BRANCH>:
2759:
2760: A branch is now starting. The next resource returned will be the first
2761: in that branch.
2762:
2763: =item * B<END_BRANCH>:
2764:
2765: The branch is now done.
2766:
2767: =back
2768:
2769: The tokens are retreivable via methods on the iterator object, i.e.,
2770: $iterator->END_MAP.
2771:
2772: Maps can contain empty resources. The iterator will automatically skip
2773: over such resources, but will still treat the structure
2774: correctly. Thus, a complicated map with several branches, but
2775: consisting entirely of empty resources except for one beginning or
2776: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2777: but only one resource will be returned.
2778:
2779: =back
2780:
2781: =head2 Normal Usage
2782:
2783: Normal usage of the iterator object is to do the following:
2784:
2785: my $it = $navmap->getIterator([your params here]);
2786: my $curRes;
2787: while ($curRes = $it->next()) {
2788: [your logic here]
2789: }
2790:
2791: Note that inside of the loop, it's frequently useful to check if
2792: "$curRes" is a reference or not with the reference function; only
2793: resource objects will be references, and any non-references will
2794: be the tokens described above.
2795:
2796: Also note there is some old code floating around that trys to track
2797: the depth of the iterator to see when it's done; do not copy that
2798: code. It is difficult to get right and harder to understand then
2799: this. They should be migrated to this new style.
2800:
2801: =cut
2802:
2803: # Here are the tokens for the iterator:
2804:
2805: sub END_ITERATOR { return 0; }
2806: sub BEGIN_MAP { return 1; } # begining of a new map
2807: sub END_MAP { return 2; } # end of the map
2808: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2809: sub END_BRANCH { return 4; } # end of a branch
2810: sub FORWARD { return 1; } # go forward
2811: sub BACKWARD { return 2; }
2812:
2813: sub min {
2814: (my $a, my $b) = @_;
2815: if ($a < $b) { return $a; } else { return $b; }
2816: }
2817:
2818: sub new {
2819: # magic invocation to create a class instance
2820: my $proto = shift;
2821: my $class = ref($proto) || $proto;
2822: my $self = {};
2823:
2824: weaken($self->{NAV_MAP} = shift);
2825: return undef unless ($self->{NAV_MAP});
2826:
2827: # Handle the parameters
2828: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2829: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2830:
2831: # If the given resources are just the ID of the resource, get the
2832: # objects
2833: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2834: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2835: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2836: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2837:
2838: $self->{FILTER} = shift;
2839:
2840: # A hash, used as a set, of resource already seen
2841: $self->{ALREADY_SEEN} = shift;
2842: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2843: $self->{CONDITION} = shift;
2844:
2845: # Do we want to automatically follow "redirection" maps?
2846: $self->{FORCE_TOP} = shift;
2847:
2848: # Do we want to return the top-level map object (resource 0.0)?
2849: $self->{RETURN_0} = shift;
2850: # have we done that yet?
2851: $self->{HAVE_RETURNED_0} = 0;
2852:
2853: # Now, we need to pre-process the map, by walking forward and backward
2854: # over the parts of the map we're going to look at.
2855:
2856: # The processing steps are exactly the same, except for a few small
2857: # changes, so I bundle those up in the following list of two elements:
2858: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2859: # first_resource).
2860: # This prevents writing nearly-identical code twice.
2861: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2862: 'FIRST_RESOURCE'],
2863: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2864: 'FINISH_RESOURCE'] );
2865:
2866: my $maxDepth = 0; # tracks max depth
2867:
2868: # If there is only one resource in this map, and it's a map, we
2869: # want to remember that, so the user can ask for the first map
2870: # that isn't just a redirector.
2871: my $resource; my $resourceCount = 0;
2872:
2873: # Documentation on this algorithm can be found in the CVS repository at
2874: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2875: # in that file.
2876: # **1**
2877:
2878: foreach my $pass (@iterations) {
2879: my $direction = $pass->[0];
2880: my $valName = $pass->[1];
2881: my $nextResourceMethod = $pass->[2];
2882: my $firstResourceName = $pass->[3];
2883:
2884: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2885: $self->{FIRST_RESOURCE},
2886: $self->{FINISH_RESOURCE},
2887: {}, undef, 0, $direction);
2888:
2889: # prime the recursion
2890: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2891: $iterator->next();
2892: my $curRes = $iterator->next();
2893: my $depth = 1;
2894: while ($depth > 0) {
2895: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2896: if ($curRes == $iterator->END_MAP()) { $depth--; }
2897:
2898: if (ref($curRes)) {
2899: # If there's only one resource, this will save it
2900: # we have to filter empty resources from consideration here,
2901: # or even "empty", redirecting maps have two (start & finish)
2902: # or three (start, finish, plus redirector)
2903: if($direction == FORWARD && $curRes->src()) {
2904: $resource = $curRes; $resourceCount++;
2905: }
2906: my $resultingVal = $curRes->{DATA}->{$valName};
2907: my $nextResources = $curRes->$nextResourceMethod();
2908: my $nextCount = scalar(@{$nextResources});
2909:
2910: if ($nextCount == 1) { # **3**
2911: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2912: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2913: }
2914:
2915: if ($nextCount > 1) { # **4**
2916: foreach my $res (@{$nextResources}) {
2917: my $current = $res->{DATA}->{$valName} || 999999999;
2918: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2919: }
2920: }
2921: }
2922:
2923: # Assign the final val (**2**)
2924: if (ref($curRes) && $direction == BACKWARD()) {
2925: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2926: $curRes->{DATA}->{BOT_UP_VAL});
2927:
2928: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2929: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2930: }
2931:
2932: $curRes = $iterator->next();
2933: }
2934: }
2935:
2936: # Check: Was this only one resource, a map?
2937: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2938: my $firstResource = $resource->map_start();
2939: my $finishResource = $resource->map_finish();
2940: return
2941: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2942: $finishResource, $self->{FILTER},
2943: $self->{ALREADY_SEEN},
2944: $self->{CONDITION},
2945: $self->{FORCE_TOP});
2946:
2947: }
2948:
2949: # Set up some bookkeeping information.
2950: $self->{CURRENT_DEPTH} = 0;
2951: $self->{MAX_DEPTH} = $maxDepth;
2952: $self->{STACK} = [];
2953: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2954: $self->{FINISHED} = 0; # When true, the iterator has finished
2955:
2956: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2957: push @{$self->{STACK}}, [];
2958: }
2959:
2960: # Prime the recursion w/ the first resource **5**
2961: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2962: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2963:
2964: bless ($self);
2965:
2966: return $self;
2967: }
2968:
2969: sub next {
2970: my $self = shift;
2971: my $closeAllPages=shift;
2972: if ($self->{FINISHED}) {
2973: return END_ITERATOR();
2974: }
2975:
2976: # If we want to return the top-level map object, and haven't yet,
2977: # do so.
2978: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2979: $self->{HAVE_RETURNED_0} = 1;
2980: return $self->{NAV_MAP}->getById('0.0');
2981: }
2982:
2983: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2984: # grab the next from the recursive iterator
2985: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2986:
2987: # is it a begin or end map? If so, update the depth
2988: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2989: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2990:
2991: # Are we back at depth 0? If so, stop recursing
2992: if ($self->{RECURSIVE_DEPTH} == 0) {
2993: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2994: }
2995:
2996: return $next;
2997: }
2998:
2999: if (defined($self->{FORCE_NEXT})) {
3000: my $tmp = $self->{FORCE_NEXT};
3001: $self->{FORCE_NEXT} = undef;
3002: return $tmp;
3003: }
3004:
3005: # Have we not yet begun? If not, return BEGIN_MAP and
3006: # remember we've started.
3007: if ( !$self->{STARTED} ) {
3008: $self->{STARTED} = 1;
3009: return $self->BEGIN_MAP();
3010: }
3011:
3012: # Here's the guts of the iterator.
3013:
3014: # Find the next resource, if any.
3015: my $found = 0;
3016: my $i = $self->{MAX_DEPTH};
3017: my $newDepth;
3018: my $here;
3019: while ( $i >= 0 && !$found ) {
3020: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3021: $here = pop @{$self->{STACK}->[$i]}; # **7**
3022: $found = 1;
3023: $newDepth = $i;
3024: }
3025: $i--;
3026: }
3027:
3028: # If we still didn't find anything, we're done.
3029: if ( !$found ) {
3030: # We need to get back down to the correct branch depth
3031: if ( $self->{CURRENT_DEPTH} > 0 ) {
3032: $self->{CURRENT_DEPTH}--;
3033: return END_BRANCH();
3034: } else {
3035: $self->{FINISHED} = 1;
3036: return END_MAP();
3037: }
3038: }
3039:
3040: # If this is not a resource, it must be an END_BRANCH marker we want
3041: # to return directly.
3042: if (!ref($here)) { # **8**
3043: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3044: $self->{CURRENT_DEPTH}--;
3045: return $here;
3046: }
3047: }
3048:
3049: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3050: $self->{HERE} = $here;
3051:
3052: # Get to the right level
3053: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3054: push @{$self->{STACK}->[$newDepth]}, $here;
3055: $self->{CURRENT_DEPTH}--;
3056: return END_BRANCH();
3057: }
3058: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3059: push @{$self->{STACK}->[$newDepth]}, $here;
3060: $self->{CURRENT_DEPTH}++;
3061: return BEGIN_BRANCH();
3062: }
3063:
3064: # If we made it here, we have the next resource, and we're at the
3065: # right branch level. So let's examine the resource for where
3066: # we can get to from here.
3067:
3068: # So we need to look at all the resources we can get to from here,
3069: # categorize them if we haven't seen them, remember if we have a new
3070: my $nextUnfiltered = $here->getNext();
3071: my $maxDepthAdded = -1;
3072:
3073: for (@$nextUnfiltered) {
3074: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3075: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3076: push @{$self->{STACK}->[$depth]}, $_;
3077: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3078: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3079: }
3080: }
3081:
3082: # Is this the end of a branch? If so, all of the resources examined above
3083: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3084: # marker onto the stack so we don't forget.
3085: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3086: # BC branch and gets to C, it will see F as the only next resource, but it's
3087: # one level lower. Thus, this is the end of the branch, since there are no
3088: # more resources added to this level or above.
3089: # We don't do this if the examined resource is the finish resource,
3090: # because the condition given above is true, but the "END_MAP" will
3091: # take care of things and we should already be at depth 0.
3092: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3093: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3094: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3095: }
3096:
3097: # That ends the main iterator logic. Now, do we want to recurse
3098: # down this map (if this resource is a map)?
3099: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3100: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3101: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3102: my $firstResource = $self->{HERE}->map_start();
3103: my $finishResource = $self->{HERE}->map_finish();
3104:
3105: $self->{RECURSIVE_ITERATOR} =
3106: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3107: $finishResource, $self->{FILTER},
3108: $self->{ALREADY_SEEN},
3109: $self->{CONDITION},
3110: $self->{FORCE_TOP});
3111: }
3112:
3113: # If this is a blank resource, don't actually return it.
3114: # Should you ever find you need it, make sure to add an option to the code
3115: # that you can use; other things depend on this behavior.
3116: my $browsePriv = $self->{HERE}->browsePriv();
3117: if (!$self->{HERE}->src() ||
3118: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3119: return $self->next($closeAllPages);
3120: }
3121:
3122: return $self->{HERE};
3123:
3124: }
3125:
3126: =pod
3127:
3128: The other method available on the iterator is B<getStack>, which
3129: returns an array populated with the current 'stack' of maps, as
3130: references to the resource objects. Example: This is useful when
3131: making the navigation map, as we need to check whether we are under a
3132: page map to see if we need to link directly to the resource, or to the
3133: page. The first elements in the array will correspond to the top of
3134: the stack (most inclusive map).
3135:
3136: =cut
3137:
3138: sub getStack {
3139: my $self=shift;
3140:
3141: my @stack;
3142:
3143: $self->populateStack(\@stack);
3144:
3145: return \@stack;
3146: }
3147:
3148: # Private method: Calls the iterators recursively to populate the stack.
3149: sub populateStack {
3150: my $self=shift;
3151: my $stack = shift;
3152:
3153: push @$stack, $self->{HERE} if ($self->{HERE});
3154:
3155: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3156: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3157: }
3158: }
3159:
3160: 1;
3161:
3162: package Apache::lonnavmaps::DFSiterator;
3163: use WeakRef;
3164: use Apache::lonnet;
3165:
3166: # Not documented in the perldoc: This is a simple iterator that just walks
3167: # through the nav map and presents the resources in a depth-first search
3168: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3169: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3170: # useful for pre-processing of some kind, and is in fact used by the main
3171: # iterator that way, but that's about it.
3172: # One could imagine merging this into the init routine of the main iterator,
3173: # but this might as well be left separate, since it is possible some other
3174: # use might be found for it. - Jeremy
3175:
3176: # Unlike the main iterator, this DOES return all resources, even blank ones.
3177: # The main iterator needs them to correctly preprocess the map.
3178:
3179: sub BEGIN_MAP { return 1; } # begining of a new map
3180: sub END_MAP { return 2; } # end of the map
3181: sub FORWARD { return 1; } # go forward
3182: sub BACKWARD { return 2; }
3183:
3184: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3185: # filter hash ref (or undef), already seen hash or undef, condition
3186: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3187: sub new {
3188: # magic invocation to create a class instance
3189: my $proto = shift;
3190: my $class = ref($proto) || $proto;
3191: my $self = {};
3192:
3193: weaken($self->{NAV_MAP} = shift);
3194: return undef unless ($self->{NAV_MAP});
3195:
3196: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3197: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3198:
3199: # If the given resources are just the ID of the resource, get the
3200: # objects
3201: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3202: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3203: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3204: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3205:
3206: $self->{FILTER} = shift;
3207:
3208: # A hash, used as a set, of resource already seen
3209: $self->{ALREADY_SEEN} = shift;
3210: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3211: $self->{CONDITION} = shift;
3212: $self->{DIRECTION} = shift || FORWARD();
3213:
3214: # Flag: Have we started yet?
3215: $self->{STARTED} = 0;
3216:
3217: # Should we continue calling the recursive iterator, if any?
3218: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3219: # The recursive iterator, if any
3220: $self->{RECURSIVE_ITERATOR} = undef;
3221: # Are we recursing on a map, or a branch?
3222: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3223: # And the count of how deep it is, so that this iterator can keep track of
3224: # when to pick back up again.
3225: $self->{RECURSIVE_DEPTH} = 0;
3226:
3227: # For keeping track of our branches, we maintain our own stack
3228: $self->{STACK} = [];
3229:
3230: # Start with the first resource
3231: if ($self->{DIRECTION} == FORWARD) {
3232: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3233: } else {
3234: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3235: }
3236:
3237: bless($self);
3238: return $self;
3239: }
3240:
3241: sub next {
3242: my $self = shift;
3243:
3244: # Are we using a recursive iterator? If so, pull from that and
3245: # watch the depth; we want to resume our level at the correct time.
3246: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3247: # grab the next from the recursive iterator
3248: my $next = $self->{RECURSIVE_ITERATOR}->next();
3249:
3250: # is it a begin or end map? Update depth if so
3251: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3252: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3253:
3254: # Are we back at depth 0? If so, stop recursing.
3255: if ($self->{RECURSIVE_DEPTH} == 0) {
3256: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3257: }
3258:
3259: return $next;
3260: }
3261:
3262: # Is there a current resource to grab? If not, then return
3263: # END_MAP, which will end the iterator.
3264: if (scalar(@{$self->{STACK}}) == 0) {
3265: return $self->END_MAP();
3266: }
3267:
3268: # Have we not yet begun? If not, return BEGIN_MAP and
3269: # remember that we've started.
3270: if ( !$self->{STARTED} ) {
3271: $self->{STARTED} = 1;
3272: return $self->BEGIN_MAP;
3273: }
3274:
3275: # Get the next resource in the branch
3276: $self->{HERE} = pop @{$self->{STACK}};
3277:
3278: # remember that we've seen this, so we don't return it again later
3279: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3280:
3281: # Get the next possible resources
3282: my $nextUnfiltered;
3283: if ($self->{DIRECTION} == FORWARD()) {
3284: $nextUnfiltered = $self->{HERE}->getNext();
3285: } else {
3286: $nextUnfiltered = $self->{HERE}->getPrevious();
3287: }
3288: my $next = [];
3289:
3290: # filter the next possibilities to remove things we've
3291: # already seen.
3292: foreach (@$nextUnfiltered) {
3293: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3294: push @$next, $_;
3295: }
3296: }
3297:
3298: while (@$next) {
3299: # copy the next possibilities over to the stack
3300: push @{$self->{STACK}}, shift @$next;
3301: }
3302:
3303: # If this is a map and we want to recurse down it... (not filtered out)
3304: if ($self->{HERE}->is_map() &&
3305: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3306: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3307: my $firstResource = $self->{HERE}->map_start();
3308: my $finishResource = $self->{HERE}->map_finish();
3309:
3310: $self->{RECURSIVE_ITERATOR} =
3311: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3312: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3313: $self->{CONDITION}, $self->{DIRECTION});
3314: }
3315:
3316: return $self->{HERE};
3317: }
3318:
3319: # Identical to the full iterator methods of the same name. Hate to copy/paste
3320: # but I also hate to "inherit" either iterator from the other.
3321:
3322: sub getStack {
3323: my $self=shift;
3324:
3325: my @stack;
3326:
3327: $self->populateStack(\@stack);
3328:
3329: return \@stack;
3330: }
3331:
3332: # Private method: Calls the iterators recursively to populate the stack.
3333: sub populateStack {
3334: my $self=shift;
3335: my $stack = shift;
3336:
3337: push @$stack, $self->{HERE} if ($self->{HERE});
3338:
3339: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3340: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3341: }
3342: }
3343:
3344: 1;
3345:
3346: package Apache::lonnavmaps::resource;
3347: use WeakRef;
3348: use Apache::lonnet;
3349:
3350: =pod
3351:
3352: =head1 Object: resource
3353:
3354: X<resource, navmap object>
3355: A resource object encapsulates a resource in a resource map, allowing
3356: easy manipulation of the resource, querying the properties of the
3357: resource (including user properties), and represents a reference that
3358: can be used as the canonical representation of the resource by
3359: lonnavmap clients like renderers.
3360:
3361: A resource only makes sense in the context of a navmap, as some of the
3362: data is stored in the navmap object.
3363:
3364: You will probably never need to instantiate this object directly. Use
3365: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3366: starting resource.
3367:
3368: Resource objects respect the parameter_hiddenparts, which suppresses
3369: various parts according to the wishes of the map author. As of this
3370: writing, there is no way to override this parameter, and suppressed
3371: parts will never be returned, nor will their response types or ids be
3372: stored.
3373:
3374: =head2 Overview
3375:
3376: A B<Resource> is the most granular type of object in LON-CAPA that can
3377: be included in a course. It can either be a particular resource, like
3378: an HTML page, external resource, problem, etc., or it can be a
3379: container sequence, such as a "page" or a "map".
3380:
3381: To see a sequence from the user's point of view, please see the
3382: B<Creating a Course: Maps and Sequences> chapter of the Author's
3383: Manual.
3384:
3385: A Resource Object, once obtained from a navmap object via a B<getBy*>
3386: method of the navmap, or from an iterator, allows you to query
3387: information about that resource.
3388:
3389: Generally, you do not ever want to create a resource object yourself,
3390: so creation has been left undocumented. Always retrieve resources
3391: from navmap objects.
3392:
3393: =head3 Identifying Resources
3394:
3395: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3396: unique to that resource for a given course. X<resource ID, in big hash>
3397: The Resource ID has the form #.#, where the first number is the same
3398: for every resource in a map, and the second is unique. For instance,
3399: for a course laid out like this:
3400:
3401: * Problem 1
3402: * Map
3403: * Resource 2
3404: * Resource 3
3405:
3406: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3407: C<Resource 3> will share a first number. The second number may end up
3408: re-used between the two groups.
3409:
3410: The resource ID is only used in the big hash, but can be used in the
3411: context of a course to identify a resource easily. (For instance, the
3412: printing system uses it to record which resources from a sequence you
3413: wish to print.)
3414:
3415: X<symb> X<resource, symb>
3416: All resources also have B<symb>s, which uniquely identify a resource
3417: in a course. Many internal LON-CAPA functions expect a symb. A symb
3418: carries along with it the URL of the resource, and the map it appears
3419: in. Symbs are much larger then resource IDs.
3420:
3421: =cut
3422:
3423: sub new {
3424: # magic invocation to create a class instance
3425: my $proto = shift;
3426: my $class = ref($proto) || $proto;
3427: my $self = {};
3428:
3429: weaken($self->{NAV_MAP} = shift);
3430: $self->{ID} = shift;
3431:
3432: # Store this new resource in the parent nav map's cache.
3433: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3434: $self->{RESOURCE_ERROR} = 0;
3435:
3436: # A hash that can be used by two-pass algorithms to store data
3437: # about this resource in. Not used by the resource object
3438: # directly.
3439: $self->{DATA} = {};
3440:
3441: bless($self);
3442:
3443: return $self;
3444: }
3445:
3446: # private function: simplify the NAV_HASH lookups we keep doing
3447: # pass the name, and to automatically append my ID, pass a true val on the
3448: # second param
3449: sub navHash {
3450: my $self = shift;
3451: my $param = shift;
3452: my $id = shift;
3453: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3454: }
3455:
3456: =pod
3457:
3458: =head2 Methods
3459:
3460: Once you have a resource object, here's what you can do with it:
3461:
3462: =head3 Attribute Retrieval
3463:
3464: Every resource has certain attributes that can be retrieved and used:
3465:
3466: =over 4
3467:
3468: =item * B<ID>: Every resource has an ID that is unique for that
3469: resource in the course it is in. The ID is actually in the hash
3470: representing the resource, so for a resource object $res, obtain
3471: it via C<$res->{ID}).
3472:
3473: =item * B<compTitle>:
3474:
3475: Returns a "composite title", that is equal to $res->title() if the
3476: resource has a title, and is otherwise the last part of the URL (e.g.,
3477: "problem.problem").
3478:
3479: =item * B<ext>:
3480:
3481: Returns true if the resource is external.
3482:
3483: =item * B<kind>:
3484:
3485: Returns the kind of the resource from the compiled nav map.
3486:
3487: =item * B<randomout>:
3488:
3489: Returns true if this resource was chosen to NOT be shown to the user
3490: by the random map selection feature. In other words, this is usually
3491: false.
3492:
3493: =item * B<randompick>:
3494:
3495: Returns true for a map if the randompick feature is being used on the
3496: map. (?)
3497:
3498: =item * B<src>:
3499:
3500: Returns the source for the resource.
3501:
3502: =item * B<symb>:
3503:
3504: Returns the symb for the resource.
3505:
3506: =item * B<title>:
3507:
3508: Returns the title of the resource.
3509:
3510: =back
3511:
3512: =cut
3513:
3514: # These info functions can be used directly, as they don't return
3515: # resource information.
3516: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3517: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3518: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3519: sub from { my $self=shift; return $self->navHash("from_", 1); }
3520: # considered private and undocumented
3521: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3522: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3523: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3524: sub randompick {
3525: my $self = shift;
3526: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3527: '.0.parameter_randompick'};
3528: }
3529: sub link {
3530: my $self=shift;
3531: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3532: return $self->src;
3533: }
3534: sub src {
3535: my $self=shift;
3536: return $self->navHash("src_", 1);
3537: }
3538: sub shown_symb {
3539: my $self=shift;
3540: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3541: return $self->symb();
3542: }
3543: sub id {
3544: my $self=shift;
3545: return $self->{ID};
3546: }
3547: sub enclosing_map_src {
3548: my $self=shift;
3549: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3550: return $self->navHash('map_id_'.$first);
3551: }
3552: sub symb {
3553: my $self=shift;
3554: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3555: my $symbSrc = &Apache::lonnet::declutter($self->src());
3556: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3557: . '___' . $second . '___' . $symbSrc;
3558: return &Apache::lonnet::symbclean($symb);
3559: }
3560: sub wrap_symb {
3561: my $self = shift;
3562: return $self->{NAV_MAP}->wrap_symb($self->symb());
3563: }
3564: sub title {
3565: my $self=shift;
3566: if ($self->{ID} eq '0.0') {
3567: # If this is the top-level map, return the title of the course
3568: # since this map can not be titled otherwise.
3569: return $env{'course.'.$env{'request.course.id'}.'.description'};
3570: }
3571: return $self->navHash("title_", 1); }
3572: # considered private and undocumented
3573: sub to { my $self=shift; return $self->navHash("to_", 1); }
3574: sub condition {
3575: my $self=shift;
3576: my $undercond=$self->navHash("undercond_", 1);
3577: if (!defined($undercond)) { return 1; };
3578: my $condid=$self->navHash("condid_$undercond");
3579: if (!defined($condid)) { return 1; };
3580: my $condition=&Apache::lonnet::directcondval($condid);
3581: return $condition;
3582: }
3583: sub condval {
3584: my $self=shift;
3585: my $uri=&Apache::lonnet::deversion(&Apache::lonnet::declutter($self->src()));
3586: my ($pathname,$filename)=($uri=~m|(.*)/([^/]*)|);
3587: $pathname=~s/^adm\/wrapper\///;
3588:
3589: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3590: /\&\Q$filename\E\:([\d\|]+)\&/);
3591: if ($match) {
3592: return &Apache::lonnet::condval($1);
3593: }
3594: return 0;
3595: }
3596: sub compTitle {
3597: my $self = shift;
3598: my $title = $self->title();
3599: $title=~s/\&colon\;/\:/gs;
3600: if (!$title) {
3601: $title = $self->src();
3602: $title = substr($title, rindex($title, '/') + 1);
3603: }
3604: return $title;
3605: }
3606: =pod
3607:
3608: B<Predicate Testing the Resource>
3609:
3610: These methods are shortcuts to deciding if a given resource has a given property.
3611:
3612: =over 4
3613:
3614: =item * B<is_map>:
3615:
3616: Returns true if the resource is a map type.
3617:
3618: =item * B<is_problem>:
3619:
3620: Returns true if the resource is a problem type, false
3621: otherwise. (Looks at the extension on the src field; might need more
3622: to work correctly.)
3623:
3624: =item * B<is_page>:
3625:
3626: Returns true if the resource is a page.
3627:
3628: =item * B<is_sequence>:
3629:
3630: Returns true if the resource is a sequence.
3631:
3632: =back
3633:
3634: =cut
3635:
3636: sub hasResource {
3637: my $self = shift;
3638: return $self->{NAV_MAP}->hasResource(@_);
3639: }
3640:
3641: sub retrieveResources {
3642: my $self = shift;
3643: return $self->{NAV_MAP}->retrieveResources(@_);
3644: }
3645:
3646: sub is_html {
3647: my $self=shift;
3648: my $src = $self->src();
3649: return ($src =~ /html$/);
3650: }
3651: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3652: sub is_page {
3653: my $self=shift;
3654: my $src = $self->src();
3655: return $self->navHash("is_map_", 1) &&
3656: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3657: }
3658: sub is_problem {
3659: my $self=shift;
3660: my $src = $self->src();
3661: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/)
3662: }
3663: sub contains_problem {
3664: my $self=shift;
3665: if ($self->is_page()) {
3666: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3667: return $hasProblem;
3668: }
3669: return 0;
3670: }
3671: sub is_sequence {
3672: my $self=shift;
3673: my $src = $self->src();
3674: return $self->navHash("is_map_", 1) &&
3675: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3676: }
3677: sub is_survey {
3678: my $self = shift();
3679: my $part = shift();
3680: if ($self->parmval('type',$part) eq 'survey') {
3681: return 1;
3682: }
3683: if ($self->src() =~ /\.(survey)$/) {
3684: return 1;
3685: }
3686: return 0;
3687: }
3688:
3689: sub is_empty_sequence {
3690: my $self=shift;
3691: my $src = $self->src();
3692: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3693: }
3694:
3695: # Private method: Shells out to the parmval in the nav map, handler parts.
3696: sub parmval {
3697: my $self = shift;
3698: my $what = shift;
3699: my $part = shift;
3700: if (!defined($part)) {
3701: $part = '0';
3702: }
3703: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3704: }
3705:
3706: =pod
3707:
3708: B<Map Methods>
3709:
3710: These methods are useful for getting information about the map
3711: properties of the resource, if the resource is a map (B<is_map>).
3712:
3713: =over 4
3714:
3715: =item * B<map_finish>:
3716:
3717: Returns a reference to a resource object corresponding to the finish
3718: resource of the map.
3719:
3720: =item * B<map_pc>:
3721:
3722: Returns the pc value of the map, which is the first number that
3723: appears in the resource ID of the resources in the map, and is the
3724: number that appears around the middle of the symbs of the resources in
3725: that map.
3726:
3727: =item * B<map_start>:
3728:
3729: Returns a reference to a resource object corresponding to the start
3730: resource of the map.
3731:
3732: =item * B<map_type>:
3733:
3734: Returns a string with the type of the map in it.
3735:
3736: =back
3737:
3738: =cut
3739:
3740: sub map_finish {
3741: my $self = shift;
3742: my $src = $self->src();
3743: $src = Apache::lonnet::clutter($src);
3744: my $res = $self->navHash("map_finish_$src", 0);
3745: $res = $self->{NAV_MAP}->getById($res);
3746: return $res;
3747: }
3748: sub map_pc {
3749: my $self = shift;
3750: my $src = $self->src();
3751: return $self->navHash("map_pc_$src", 0);
3752: }
3753: sub map_start {
3754: my $self = shift;
3755: my $src = $self->src();
3756: $src = Apache::lonnet::clutter($src);
3757: my $res = $self->navHash("map_start_$src", 0);
3758: $res = $self->{NAV_MAP}->getById($res);
3759: return $res;
3760: }
3761: sub map_type {
3762: my $self = shift;
3763: my $pc = $self->map_pc();
3764: return $self->navHash("map_type_$pc", 0);
3765: }
3766:
3767: #####
3768: # Property queries
3769: #####
3770:
3771: # These functions will be responsible for returning the CORRECT
3772: # VALUE for the parameter, no matter what. So while they may look
3773: # like direct calls to parmval, they can be more then that.
3774: # So, for instance, the duedate function should use the "duedatetype"
3775: # information, rather then the resource object user.
3776:
3777: =pod
3778:
3779: =head2 Resource Parameters
3780:
3781: In order to use the resource parameters correctly, the nav map must
3782: have been instantiated with genCourseAndUserOptions set to true, so
3783: the courseopt and useropt is read correctly. Then, you can call these
3784: functions to get the relevant parameters for the resource. Each
3785: function defaults to part "0", but can be directed to another part by
3786: passing the part as the parameter.
3787:
3788: These methods are responsible for getting the parameter correct, not
3789: merely reflecting the contents of the GDBM hashes. As we move towards
3790: dates relative to other dates, these methods should be updated to
3791: reflect that. (Then, anybody using these methods will not have to update
3792: their code.)
3793:
3794: =over 4
3795:
3796: =item * B<acc>:
3797:
3798: Get the Client IP/Name Access Control information.
3799:
3800: =item * B<answerdate>:
3801:
3802: Get the answer-reveal date for the problem.
3803:
3804: =item * B<awarded>:
3805:
3806: Gets the awarded value for the problem part. Requires genUserData set to
3807: true when the navmap object was created.
3808:
3809: =item * B<duedate>:
3810:
3811: Get the due date for the problem.
3812:
3813: =item * B<tries>:
3814:
3815: Get the number of tries the student has used on the problem.
3816:
3817: =item * B<maxtries>:
3818:
3819: Get the number of max tries allowed.
3820:
3821: =item * B<opendate>:
3822:
3823: Get the open date for the problem.
3824:
3825: =item * B<sig>:
3826:
3827: Get the significant figures setting.
3828:
3829: =item * B<tol>:
3830:
3831: Get the tolerance for the problem.
3832:
3833: =item * B<tries>:
3834:
3835: Get the number of tries the user has already used on the problem.
3836:
3837: =item * B<type>:
3838:
3839: Get the question type for the problem.
3840:
3841: =item * B<weight>:
3842:
3843: Get the weight for the problem.
3844:
3845: =back
3846:
3847: =cut
3848:
3849: sub acc {
3850: (my $self, my $part) = @_;
3851: return $self->parmval("acc", $part);
3852: }
3853: sub answerdate {
3854: (my $self, my $part) = @_;
3855: # Handle intervals
3856: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3857: return $self->duedate($part) +
3858: $self->parmval("answerdate", $part);
3859: }
3860: return $self->parmval("answerdate", $part);
3861: }
3862: sub awarded {
3863: my $self = shift; my $part = shift;
3864: $self->{NAV_MAP}->get_user_data();
3865: if (!defined($part)) { $part = '0'; }
3866: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3867: }
3868: sub duedate {
3869: (my $self, my $part) = @_;
3870: my $interval=$self->parmval("interval", $part);
3871: if ($interval) {
3872: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3873: if ($first_access) { return ($first_access+$interval); }
3874: }
3875: return $self->parmval("duedate", $part);
3876: }
3877: sub handgrade {
3878: (my $self, my $part) = @_;
3879: return $self->parmval("handgrade", $part);
3880: }
3881: sub maxtries {
3882: (my $self, my $part) = @_;
3883: return $self->parmval("maxtries", $part);
3884: }
3885: sub opendate {
3886: (my $self, my $part) = @_;
3887: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3888: return $self->duedate($part) -
3889: $self->parmval("opendate", $part);
3890: }
3891: return $self->parmval("opendate");
3892: }
3893: sub problemstatus {
3894: (my $self, my $part) = @_;
3895: return lc $self->parmval("problemstatus", $part);
3896: }
3897: sub sig {
3898: (my $self, my $part) = @_;
3899: return $self->parmval("sig", $part);
3900: }
3901: sub tol {
3902: (my $self, my $part) = @_;
3903: return $self->parmval("tol", $part);
3904: }
3905: sub tries {
3906: my $self = shift;
3907: my $tries = $self->queryRestoreHash('tries', shift);
3908: if (!defined($tries)) { return '0';}
3909: return $tries;
3910: }
3911: sub type {
3912: (my $self, my $part) = @_;
3913: return $self->parmval("type", $part);
3914: }
3915: sub weight {
3916: my $self = shift; my $part = shift;
3917: if (!defined($part)) { $part = '0'; }
3918: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3919: $self->symb(), $env{'user.domain'},
3920: $env{'user.name'},
3921: $env{'request.course.sec'});
3922: }
3923: sub part_display {
3924: my $self= shift(); my $partID = shift();
3925: if (! defined($partID)) { $partID = '0'; }
3926: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3927: $self->symb);
3928: if (! defined($display) || $display eq '') {
3929: $display = $partID;
3930: }
3931: return $display;
3932: }
3933:
3934: # Multiple things need this
3935: sub getReturnHash {
3936: my $self = shift;
3937:
3938: if (!defined($self->{RETURN_HASH})) {
3939: my %tmpHash = &Apache::lonnet::restore($self->symb());
3940: $self->{RETURN_HASH} = \%tmpHash;
3941: }
3942: }
3943:
3944: ######
3945: # Status queries
3946: ######
3947:
3948: # These methods query the status of problems.
3949:
3950: # If we need to count parts, this function determines the number of
3951: # parts from the metadata. When called, it returns a reference to a list
3952: # of strings corresponding to the parts. (Thus, using it in a scalar context
3953: # tells you how many parts you have in the problem:
3954: # $partcount = scalar($resource->countParts());
3955: # Don't use $self->{PARTS} directly because you don't know if it's been
3956: # computed yet.
3957:
3958: =pod
3959:
3960: =head2 Resource misc
3961:
3962: Misc. functions for the resource.
3963:
3964: =over 4
3965:
3966: =item * B<hasDiscussion>:
3967:
3968: Returns a false value if there has been discussion since the user last
3969: logged in, true if there has. Always returns false if the discussion
3970: data was not extracted when the nav map was constructed.
3971:
3972: =item * B<getFeedback>:
3973:
3974: Gets the feedback for the resource and returns the raw feedback string
3975: for the resource, or the null string if there is no feedback or the
3976: email data was not extracted when the nav map was constructed. Usually
3977: used like this:
3978:
3979: for (split(/\,/, $res->getFeedback())) {
3980: my $link = &Apache::lonnet::escape($_);
3981: ...
3982:
3983: and use the link as appropriate.
3984:
3985: =cut
3986:
3987: sub hasDiscussion {
3988: my $self = shift;
3989: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3990: }
3991:
3992: sub getFeedback {
3993: my $self = shift;
3994: my $source = $self->src();
3995: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3996: return $self->{NAV_MAP}->getFeedback($source);
3997: }
3998:
3999: sub getErrors {
4000: my $self = shift;
4001: my $source = $self->src();
4002: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4003: return $self->{NAV_MAP}->getErrors($source);
4004: }
4005:
4006: =pod
4007:
4008: =item * B<parts>():
4009:
4010: Returns a list reference containing sorted strings corresponding to
4011: each part of the problem. Single part problems have only a part '0'.
4012: Multipart problems do not return their part '0', since they typically
4013: do not really matter.
4014:
4015: =item * B<countParts>():
4016:
4017: Returns the number of parts of the problem a student can answer. Thus,
4018: for single part problems, returns 1. For multipart, it returns the
4019: number of parts in the problem, not including psuedo-part 0.
4020:
4021: =item * B<countResponses>():
4022:
4023: Returns the total number of responses in the problem a student can answer.
4024:
4025: =item * B<responseTypes>():
4026:
4027: Returns a hash whose keys are the response types. The values are the number
4028: of times each response type is used. This is for the I<entire> problem, not
4029: just a single part.
4030:
4031: =item * B<multipart>():
4032:
4033: Returns true if the problem is multipart, false otherwise. Use this instead
4034: of countParts if all you want is multipart/not multipart.
4035:
4036: =item * B<responseType>($part):
4037:
4038: Returns the response type of the part, without the word "response" on the
4039: end. Example return values: 'string', 'essay', 'numeric', etc.
4040:
4041: =item * B<responseIds>($part):
4042:
4043: Retreives the response IDs for the given part as an array reference containing
4044: strings naming the response IDs. This may be empty.
4045:
4046: =back
4047:
4048: =cut
4049:
4050: sub parts {
4051: my $self = shift;
4052:
4053: if ($self->ext) { return []; }
4054:
4055: $self->extractParts();
4056: return $self->{PARTS};
4057: }
4058:
4059: sub countParts {
4060: my $self = shift;
4061:
4062: my $parts = $self->parts();
4063:
4064: # If I left this here, then it's not necessary.
4065: #my $delta = 0;
4066: #for my $part (@$parts) {
4067: # if ($part eq '0') { $delta--; }
4068: #}
4069:
4070: if ($self->{RESOURCE_ERROR}) {
4071: return 0;
4072: }
4073:
4074: return scalar(@{$parts}); # + $delta;
4075: }
4076:
4077: sub countResponses {
4078: my $self = shift;
4079: my $count;
4080: foreach my $part (@{$self->parts()}) {
4081: $count+= scalar($self->responseIds($part));
4082: }
4083: return $count;
4084: }
4085:
4086: sub responseTypes {
4087: my $self = shift;
4088: my %responses;
4089: foreach my $part ($self->parts()) {
4090: foreach my $responsetype ($self->responseType($part)) {
4091: $responses{$responsetype}++ if (defined($responsetype));
4092: }
4093: }
4094: return %responses;
4095: }
4096:
4097: sub multipart {
4098: my $self = shift;
4099: return $self->countParts() > 1;
4100: }
4101:
4102: sub singlepart {
4103: my $self = shift;
4104: return $self->countParts() == 1;
4105: }
4106:
4107: sub responseType {
4108: my $self = shift;
4109: my $part = shift;
4110:
4111: $self->extractParts();
4112: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4113: return @{$self->{RESPONSE_TYPES}->{$part}};
4114: } else {
4115: return undef;
4116: }
4117: }
4118:
4119: sub responseIds {
4120: my $self = shift;
4121: my $part = shift;
4122:
4123: $self->extractParts();
4124: if (defined($self->{RESPONSE_IDS}->{$part})) {
4125: return @{$self->{RESPONSE_IDS}->{$part}};
4126: } else {
4127: return undef;
4128: }
4129: }
4130:
4131: # Private function: Extracts the parts information, both part names and
4132: # part types, and saves it.
4133: sub extractParts {
4134: my $self = shift;
4135:
4136: return if (defined($self->{PARTS}));
4137: return if ($self->ext);
4138:
4139: $self->{PARTS} = [];
4140:
4141: my %parts;
4142:
4143: # Retrieve part count, if this is a problem
4144: if ($self->is_problem()) {
4145: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4146: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4147:
4148: if ($partorder) {
4149: my @parts;
4150: for my $part (split (/,/,$partorder)) {
4151: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4152: push @parts, $part;
4153: $parts{$part} = 1;
4154: }
4155: }
4156: $self->{PARTS} = \@parts;
4157: } else {
4158: if (!$metadata) {
4159: $self->{RESOURCE_ERROR} = 1;
4160: $self->{PARTS} = [];
4161: $self->{PART_TYPE} = {};
4162: return;
4163: }
4164: foreach (split(/\,/,$metadata)) {
4165: if ($_ =~ /^(?:part|Task)_(.*)$/) {
4166: my $part = $1;
4167: # This floods the logs if it blows up
4168: if (defined($parts{$part})) {
4169: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4170: }
4171:
4172: # check to see if part is turned off.
4173:
4174: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4175: $parts{$part} = 1;
4176: }
4177: }
4178: }
4179: my @sortedParts = sort keys %parts;
4180: $self->{PARTS} = \@sortedParts;
4181: }
4182:
4183:
4184: # These hashes probably do not need names that end with "Hash"....
4185: my %responseIdHash;
4186: my %responseTypeHash;
4187:
4188:
4189: # Init the responseIdHash
4190: foreach (@{$self->{PARTS}}) {
4191: $responseIdHash{$_} = [];
4192: }
4193:
4194: # Now, the unfortunate thing about this is that parts, part name, and
4195: # response id are delimited by underscores, but both the part
4196: # name and response id can themselves have underscores in them.
4197: # So we have to use our knowlege of part names to figure out
4198: # where the part names begin and end, and even then, it is possible
4199: # to construct ambiguous situations.
4200: foreach (split /,/, $metadata) {
4201: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4202: my $responseType = $1;
4203: my $partStuff = $2;
4204: my $partIdSoFar = '';
4205: my @partChunks = split /_/, $partStuff;
4206: my $i = 0;
4207: for ($i = 0; $i < scalar(@partChunks); $i++) {
4208: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4209: $partIdSoFar .= $partChunks[$i];
4210: if ($parts{$partIdSoFar}) {
4211: my @otherChunks = @partChunks[$i+1..$#partChunks];
4212: my $responseId = join('_', @otherChunks);
4213: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4214: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4215: }
4216: }
4217: }
4218: }
4219: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4220: #
4221: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4222: if ($resorder) {
4223: my @resorder=split(/,/,$resorder);
4224: foreach my $part (keys(%responseIdHash)) {
4225: my $i=0;
4226: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4227: my @neworder;
4228: foreach my $possibleid (@resorder) {
4229: if (exists($resids{$possibleid})) {
4230: push(@neworder,$resids{$possibleid});
4231: }
4232: }
4233: my @ids;
4234: my @type;
4235: foreach my $element (@neworder) {
4236: push (@ids,$responseIdHash{$part}->[$element]);
4237: push (@type,$responseTypeHash{$part}->[$element]);
4238: }
4239: $responseIdHash{$part}=\@ids;
4240: $responseTypeHash{$part}=\@type;
4241: }
4242: }
4243: $self->{RESPONSE_IDS} = \%responseIdHash;
4244: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4245: }
4246:
4247: return;
4248: }
4249:
4250: =pod
4251:
4252: =head2 Resource Status
4253:
4254: Problem resources have status information, reflecting their various
4255: dates and completion statuses.
4256:
4257: There are two aspects to the status: the date-related information and
4258: the completion information.
4259:
4260: Idiomatic usage of these two methods would probably look something
4261: like
4262:
4263: foreach ($resource->parts()) {
4264: my $dateStatus = $resource->getDateStatus($_);
4265: my $completionStatus = $resource->getCompletionStatus($_);
4266:
4267: or
4268:
4269: my $status = $resource->status($_);
4270:
4271: ... use it here ...
4272: }
4273:
4274: Which you use depends on exactly what you are looking for. The
4275: status() function has been optimized for the nav maps display and may
4276: not precisely match what you need elsewhere.
4277:
4278: The symbolic constants shown below can be accessed through the
4279: resource object: C<$res->OPEN>.
4280:
4281: =over 4
4282:
4283: =item * B<getDateStatus>($part):
4284:
4285: ($part defaults to 0). A convenience function that returns a symbolic
4286: constant telling you about the date status of the part. The possible
4287: return values are:
4288:
4289: =back
4290:
4291: B<Date Codes>
4292:
4293: =over 4
4294:
4295: =item * B<OPEN_LATER>:
4296:
4297: The problem will be opened later.
4298:
4299: =item * B<OPEN>:
4300:
4301: Open and not yet due.
4302:
4303:
4304: =item * B<PAST_DUE_ANSWER_LATER>:
4305:
4306: The due date has passed, but the answer date has not yet arrived.
4307:
4308: =item * B<PAST_DUE_NO_ANSWER>:
4309:
4310: The due date has passed and there is no answer opening date set.
4311:
4312: =item * B<ANSWER_OPEN>:
4313:
4314: The answer date is here.
4315:
4316: =item * B<NETWORK_FAILURE>:
4317:
4318: The information is unknown due to network failure.
4319:
4320: =back
4321:
4322: =cut
4323:
4324: # Apparently the compiler optimizes these into constants automatically
4325: sub OPEN_LATER { return 0; }
4326: sub OPEN { return 1; }
4327: sub PAST_DUE_NO_ANSWER { return 2; }
4328: sub PAST_DUE_ANSWER_LATER { return 3; }
4329: sub ANSWER_OPEN { return 4; }
4330: sub NOTHING_SET { return 5; }
4331: sub NETWORK_FAILURE { return 100; }
4332:
4333: # getDateStatus gets the date status for a given problem part.
4334: # Because answer date, due date, and open date are fully independent
4335: # (i.e., it is perfectly possible to *only* have an answer date),
4336: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4337: # (past, future, none given). This function handles this with a decision
4338: # tree. Read the comments to follow the decision tree.
4339:
4340: sub getDateStatus {
4341: my $self = shift;
4342: my $part = shift;
4343: $part = "0" if (!defined($part));
4344:
4345: # Always return network failure if there was one.
4346: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4347:
4348: my $now = time();
4349:
4350: my $open = $self->opendate($part);
4351: my $due = $self->duedate($part);
4352: my $answer = $self->answerdate($part);
4353:
4354: if (!$open && !$due && !$answer) {
4355: # no data on the problem at all
4356: # should this be the same as "open later"? think multipart.
4357: return $self->NOTHING_SET;
4358: }
4359: if (!$open || $now < $open) {return $self->OPEN_LATER}
4360: if (!$due || $now < $due) {return $self->OPEN}
4361: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4362: if ($answer) { return $self->ANSWER_OPEN; }
4363: return PAST_DUE_NO_ANSWER;
4364: }
4365:
4366: =pod
4367:
4368: B<>
4369:
4370: =over 4
4371:
4372: =item * B<getCompletionStatus>($part):
4373:
4374: ($part defaults to 0.) A convenience function that returns a symbolic
4375: constant telling you about the completion status of the part, with the
4376: following possible results:
4377:
4378: =back
4379:
4380: B<Completion Codes>
4381:
4382: =over 4
4383:
4384: =item * B<NOT_ATTEMPTED>:
4385:
4386: Has not been attempted at all.
4387:
4388: =item * B<INCORRECT>:
4389:
4390: Attempted, but wrong by student.
4391:
4392: =item * B<INCORRECT_BY_OVERRIDE>:
4393:
4394: Attempted, but wrong by instructor override.
4395:
4396: =item * B<CORRECT>:
4397:
4398: Correct or correct by instructor.
4399:
4400: =item * B<CORRECT_BY_OVERRIDE>:
4401:
4402: Correct by instructor override.
4403:
4404: =item * B<EXCUSED>:
4405:
4406: Excused. Not yet implemented.
4407:
4408: =item * B<NETWORK_FAILURE>:
4409:
4410: Information not available due to network failure.
4411:
4412: =item * B<ATTEMPTED>:
4413:
4414: Attempted, and not yet graded.
4415:
4416: =back
4417:
4418: =cut
4419:
4420: sub NOT_ATTEMPTED { return 10; }
4421: sub INCORRECT { return 11; }
4422: sub INCORRECT_BY_OVERRIDE { return 12; }
4423: sub CORRECT { return 13; }
4424: sub CORRECT_BY_OVERRIDE { return 14; }
4425: sub EXCUSED { return 15; }
4426: sub ATTEMPTED { return 16; }
4427:
4428: sub getCompletionStatus {
4429: my $self = shift;
4430: my $part = shift;
4431: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4432:
4433: my $status = $self->queryRestoreHash('solved', $part);
4434:
4435: # Left as separate if statements in case we ever do more with this
4436: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4437: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4438: if ($status eq 'correct_by_override') {
4439: return $self->CORRECT_BY_OVERRIDE;
4440: }
4441: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4442: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4443: if ($status eq 'excused') {return $self->EXCUSED; }
4444: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4445: return $self->NOT_ATTEMPTED;
4446: }
4447:
4448: sub queryRestoreHash {
4449: my $self = shift;
4450: my $hashentry = shift;
4451: my $part = shift;
4452: $part = "0" if (!defined($part) || $part eq '');
4453: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4454:
4455: $self->getReturnHash();
4456:
4457: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4458: }
4459:
4460: =pod
4461:
4462: B<Composite Status>
4463:
4464: Along with directly returning the date or completion status, the
4465: resource object includes a convenience function B<status>() that will
4466: combine the two status tidbits into one composite status that can
4467: represent the status of the resource as a whole. This method represents
4468: the concept of the thing we want to display to the user on the nav maps
4469: screen, which is a combination of completion and open status. The precise logic is
4470: documented in the comments of the status method. The following results
4471: may be returned, all available as methods on the resource object
4472: ($res->NETWORK_FAILURE): In addition to the return values that match
4473: the date or completion status, this function can return "ANSWER_SUBMITTED"
4474: if that problemstatus parameter value is set to No, suppressing the
4475: incorrect/correct feedback.
4476:
4477: =over 4
4478:
4479: =item * B<NETWORK_FAILURE>:
4480:
4481: The network has failed and the information is not available.
4482:
4483: =item * B<NOTHING_SET>:
4484:
4485: No dates have been set for this problem (part) at all. (Because only
4486: certain parts of a multi-part problem may be assigned, this can not be
4487: collapsed into "open later", as we do not know a given part will EVER
4488: be opened. For single part, this is the same as "OPEN_LATER".)
4489:
4490: =item * B<CORRECT>:
4491:
4492: For any reason at all, the part is considered correct.
4493:
4494: =item * B<EXCUSED>:
4495:
4496: For any reason at all, the problem is excused.
4497:
4498: =item * B<PAST_DUE_NO_ANSWER>:
4499:
4500: The problem is past due, not considered correct, and no answer date is
4501: set.
4502:
4503: =item * B<PAST_DUE_ANSWER_LATER>:
4504:
4505: The problem is past due, not considered correct, and an answer date in
4506: the future is set.
4507:
4508: =item * B<ANSWER_OPEN>:
4509:
4510: The problem is past due, not correct, and the answer is now available.
4511:
4512: =item * B<OPEN_LATER>:
4513:
4514: The problem is not yet open.
4515:
4516: =item * B<TRIES_LEFT>:
4517:
4518: The problem is open, has been tried, is not correct, but there are
4519: tries left.
4520:
4521: =item * B<INCORRECT>:
4522:
4523: The problem is open, and all tries have been used without getting the
4524: correct answer.
4525:
4526: =item * B<OPEN>:
4527:
4528: The item is open and not yet tried.
4529:
4530: =item * B<ATTEMPTED>:
4531:
4532: The problem has been attempted.
4533:
4534: =item * B<ANSWER_SUBMITTED>:
4535:
4536: An answer has been submitted, but the student should not see it.
4537:
4538: =back
4539:
4540: =cut
4541:
4542: sub TRIES_LEFT { return 20; }
4543: sub ANSWER_SUBMITTED { return 21; }
4544: sub PARTIALLY_CORRECT{ return 22; }
4545:
4546: sub status {
4547: my $self = shift;
4548: my $part = shift;
4549: if (!defined($part)) { $part = "0"; }
4550: my $completionStatus = $self->getCompletionStatus($part);
4551: my $dateStatus = $self->getDateStatus($part);
4552:
4553: # What we have is a two-dimensional matrix with 4 entries on one
4554: # dimension and 5 entries on the other, which we want to colorize,
4555: # plus network failure and "no date data at all".
4556:
4557: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4558: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4559:
4560: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4561: # If there's an answer date and we're past it, don't
4562: # suppress the feedback; student should know
4563: if ($self->duedate($part) && $self->duedate($part) < time() &&
4564: $self->answerdate($part) && $self->answerdate($part) < time()) {
4565: $suppressFeedback = 0;
4566: }
4567:
4568: # There are a few whole rows we can dispose of:
4569: if ($completionStatus == CORRECT ||
4570: $completionStatus == CORRECT_BY_OVERRIDE ) {
4571: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4572: my $awarded=$self->awarded($part);
4573: if ($awarded < 1 && $awarded > 0) {
4574: return PARTIALLY_CORRECT;
4575: } elsif ($awarded<1) {
4576: return INCORRECT;
4577: }
4578: return CORRECT;
4579: }
4580:
4581: # If it's WRONG... and not open
4582: if ( ($completionStatus == INCORRECT ||
4583: $completionStatus == INCORRECT_BY_OVERRIDE)
4584: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
4585: return INCORRECT;
4586: }
4587:
4588: if ($completionStatus == ATTEMPTED) {
4589: return ATTEMPTED;
4590: }
4591:
4592: # If it's EXCUSED, then return that no matter what
4593: if ($completionStatus == EXCUSED) {
4594: return EXCUSED;
4595: }
4596:
4597: if ($dateStatus == NOTHING_SET) {
4598: return NOTHING_SET;
4599: }
4600:
4601: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4602: # by 4 matrix (date statuses).
4603:
4604: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4605: $dateStatus == PAST_DUE_NO_ANSWER ) {
4606: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4607: }
4608:
4609: if ($dateStatus == ANSWER_OPEN) {
4610: return ANSWER_OPEN;
4611: }
4612:
4613: # Now: (incorrect, incorrect_override, not_attempted) x
4614: # (open_later), (open)
4615:
4616: if ($dateStatus == OPEN_LATER) {
4617: return OPEN_LATER;
4618: }
4619:
4620: # If it's WRONG...
4621: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4622: # and there are TRIES LEFT:
4623: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4624: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4625: }
4626: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4627: }
4628:
4629: # Otherwise, it's untried and open
4630: return OPEN;
4631: }
4632:
4633: sub CLOSED { return 23; }
4634: sub ERROR { return 24; }
4635:
4636: =pod
4637:
4638: B<Simple Status>
4639:
4640: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4641: "Simple status" corresponds to "which icon is shown on the
4642: Navmaps". There are six "simple" statuses:
4643:
4644: =over 4
4645:
4646: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4647:
4648: =item * B<OPEN>: The problem is open and unattempted.
4649:
4650: =item * B<CORRECT>: The problem is correct for any reason.
4651:
4652: =item * B<INCORRECT>: The problem is incorrect and can still be
4653: completed successfully.
4654:
4655: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4656: does not know if they are correct. (The ellipsis icon.)
4657:
4658: =item * B<ERROR>: There is an error retrieving information about this
4659: problem.
4660:
4661: =back
4662:
4663: =cut
4664:
4665: # This hash maps the composite status to this simple status, and
4666: # can be used directly, if you like
4667: my %compositeToSimple =
4668: (
4669: NETWORK_FAILURE() => ERROR,
4670: NOTHING_SET() => CLOSED,
4671: CORRECT() => CORRECT,
4672: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4673: EXCUSED() => CORRECT,
4674: PAST_DUE_NO_ANSWER() => INCORRECT,
4675: PAST_DUE_ANSWER_LATER() => INCORRECT,
4676: ANSWER_OPEN() => INCORRECT,
4677: OPEN_LATER() => CLOSED,
4678: TRIES_LEFT() => OPEN,
4679: INCORRECT() => INCORRECT,
4680: OPEN() => OPEN,
4681: ATTEMPTED() => ATTEMPTED,
4682: ANSWER_SUBMITTED() => ATTEMPTED
4683: );
4684:
4685: sub simpleStatus {
4686: my $self = shift;
4687: my $part = shift;
4688: my $status = $self->status($part);
4689: return $compositeToSimple{$status};
4690: }
4691:
4692: =pod
4693:
4694: B<simpleStatusCount> will return an array reference containing, in
4695: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4696: and ERROR parts the given problem has.
4697:
4698: =cut
4699:
4700: # This maps the status to the slot we want to increment
4701: my %statusToSlotMap =
4702: (
4703: OPEN() => 0,
4704: CLOSED() => 1,
4705: CORRECT() => 2,
4706: INCORRECT() => 3,
4707: ATTEMPTED() => 4,
4708: ERROR() => 5
4709: );
4710:
4711: sub statusToSlot { return $statusToSlotMap{shift()}; }
4712:
4713: sub simpleStatusCount {
4714: my $self = shift;
4715:
4716: my @counts = (0, 0, 0, 0, 0, 0, 0);
4717: foreach my $part (@{$self->parts()}) {
4718: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4719: }
4720:
4721: return \@counts;
4722: }
4723:
4724: =pod
4725:
4726: B<Completable>
4727:
4728: The completable method represents the concept of I<whether the student can
4729: currently do the problem>. If the student can do the problem, which means
4730: that it is open, there are tries left, and if the problem is manually graded
4731: or the grade is suppressed via problemstatus, the student has not tried it
4732: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4733: either the student has tried it and there is no feedback, or that for
4734: some reason it is no longer completable (not open yet, successfully completed,
4735: out of tries, etc.). As an example, this is used as the filter for the
4736: "Uncompleted Homework" option for the nav maps.
4737:
4738: If this does not quite meet your needs, do not fiddle with it (unless you are
4739: fixing it to better match the student's conception of "completable" because
4740: it's broken somehow)... make a new method.
4741:
4742: =cut
4743:
4744: sub completable {
4745: my $self = shift;
4746: if (!$self->is_problem()) { return 0; }
4747: my $partCount = $self->countParts();
4748:
4749: foreach my $part (@{$self->parts()}) {
4750: if ($part eq '0' && $partCount != 1) { next; }
4751: my $status = $self->status($part);
4752: # "If any of the parts are open, or have tries left (implies open),
4753: # and it is not "attempted" (manually graded problem), it is
4754: # not "complete"
4755: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4756: $status == ANSWER_SUBMITTED() ) {
4757: # did this part already, as well as we can
4758: next;
4759: }
4760: if ($status == OPEN() || $status == TRIES_LEFT()) {
4761: return 1;
4762: }
4763: }
4764:
4765: # If all the parts were complete, so was this problem.
4766: return 0;
4767: }
4768:
4769: =pod
4770:
4771: =head2 Resource/Nav Map Navigation
4772:
4773: =over 4
4774:
4775: =item * B<getNext>():
4776:
4777: Retreive an array of the possible next resources after this
4778: one. Always returns an array, even in the one- or zero-element case.
4779:
4780: =item * B<getPrevious>():
4781:
4782: Retreive an array of the possible previous resources from this
4783: one. Always returns an array, even in the one- or zero-element case.
4784:
4785: =cut
4786:
4787: sub getNext {
4788: my $self = shift;
4789: my @branches;
4790: my $to = $self->to();
4791: foreach my $branch ( split(/,/, $to) ) {
4792: my $choice = $self->{NAV_MAP}->getById($branch);
4793: #if (!$choice->condition()) { next; }
4794: my $next = $choice->goesto();
4795: $next = $self->{NAV_MAP}->getById($next);
4796:
4797: push @branches, $next;
4798: }
4799: return \@branches;
4800: }
4801:
4802: sub getPrevious {
4803: my $self = shift;
4804: my @branches;
4805: my $from = $self->from();
4806: foreach my $branch ( split /,/, $from) {
4807: my $choice = $self->{NAV_MAP}->getById($branch);
4808: my $prev = $choice->comesfrom();
4809: $prev = $self->{NAV_MAP}->getById($prev);
4810:
4811: push @branches, $prev;
4812: }
4813: return \@branches;
4814: }
4815:
4816: sub browsePriv {
4817: my $self = shift;
4818: if (defined($self->{BROWSE_PRIV})) {
4819: return $self->{BROWSE_PRIV};
4820: }
4821:
4822: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4823: $self->symb());
4824: }
4825:
4826: =pod
4827:
4828: =back
4829:
4830: =cut
4831:
4832: 1;
4833:
4834: __END__
4835:
4836:
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