1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.212 2003/06/25 18:32:06 bowersj2 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: # (Page Handler
29: #
30: # (TeX Content Handler
31: #
32: # 05/29/00,05/30 Gerd Kortemeyer)
33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
35: #
36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
37: # YEAR=2002
38: # 1/1 Gerd Kortemeyer
39: # Oct-Nov Jeremy Bowers
40: # YEAR=2003
41: # Jeremy Bowers ... lots of days
42:
43: package Apache::lonnavmaps;
44:
45: use strict;
46: use Apache::Constants qw(:common :http);
47: use Apache::loncommon();
48: use Apache::lonmenu();
49: use POSIX qw (floor strftime);
50: use Data::Dumper; # for debugging, not always used
51:
52: # symbolic constants
53: sub SYMB { return 1; }
54: sub URL { return 2; }
55: sub NOTHING { return 3; }
56:
57: # Some data
58:
59: my $resObj = "Apache::lonnavmaps::resource";
60:
61: # Keep these mappings in sync with lonquickgrades, which uses the colors
62: # instead of the icons.
63: my %statusIconMap =
64: ( $resObj->NETWORK_FAILURE => '',
65: $resObj->NOTHING_SET => '',
66: $resObj->CORRECT => 'navmap.correct.gif',
67: $resObj->EXCUSED => 'navmap.correct.gif',
68: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
69: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
70: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
71: $resObj->OPEN_LATER => '',
72: $resObj->TRIES_LEFT => 'navmap.open.gif',
73: $resObj->INCORRECT => 'navmap.wrong.gif',
74: $resObj->OPEN => 'navmap.open.gif',
75: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
76: $resObj->ANSWER_SUBMITTED => '' );
77:
78: my %iconAltTags =
79: ( 'navmap.correct.gif' => 'Correct',
80: 'navmap.wrong.gif' => 'Incorrect',
81: 'navmap.open.gif' => 'Open' );
82:
83: # Defines a status->color mapping, null string means don't color
84: my %colormap =
85: ( $resObj->NETWORK_FAILURE => '',
86: $resObj->CORRECT => '',
87: $resObj->EXCUSED => '#3333FF',
88: $resObj->PAST_DUE_ANSWER_LATER => '',
89: $resObj->PAST_DUE_NO_ANSWER => '',
90: $resObj->ANSWER_OPEN => '#006600',
91: $resObj->OPEN_LATER => '',
92: $resObj->TRIES_LEFT => '',
93: $resObj->INCORRECT => '',
94: $resObj->OPEN => '',
95: $resObj->NOTHING_SET => '',
96: $resObj->ATTEMPTED => '',
97: $resObj->ANSWER_SUBMITTED => ''
98: );
99: # And a special case in the nav map; what to do when the assignment
100: # is not yet done and due in less then 24 hours
101: my $hurryUpColor = "#FF0000";
102:
103: sub handler {
104: my $r = shift;
105: real_handler($r);
106: }
107:
108: sub real_handler {
109: my $r = shift;
110:
111: # Handle header-only request
112: if ($r->header_only) {
113: if ($ENV{'browser.mathml'}) {
114: $r->content_type('text/xml');
115: } else {
116: $r->content_type('text/html');
117: }
118: $r->send_http_header;
119: return OK;
120: }
121:
122: # Send header, don't cache this page
123: if ($ENV{'browser.mathml'}) {
124: $r->content_type('text/xml');
125: } else {
126: $r->content_type('text/html');
127: }
128: &Apache::loncommon::no_cache($r);
129: $r->send_http_header;
130:
131: # Create the nav map
132: my $navmap = Apache::lonnavmaps::navmap->new(
133: $ENV{"request.course.fn"}.".db",
134: $ENV{"request.course.fn"}."_parms.db", 1, 1);
135:
136:
137: if (!defined($navmap)) {
138: my $requrl = $r->uri;
139: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
140: return HTTP_NOT_ACCEPTABLE;
141: }
142:
143: $r->print("<html><head>\n");
144: $r->print("<title>Navigate Course Contents</title>");
145: # ------------------------------------------------------------ Get query string
146: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
147:
148: # ----------------------------------------------------- Force menu registration
149: my $addentries='';
150: if ($ENV{'form.register'}) {
151: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
152: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
153: $r->print(&Apache::lonmenu::registerurl(1));
154: }
155:
156: # Header
157: $r->print('</head>'.
158: &Apache::loncommon::bodytag('Navigate Course Contents','',
159: $addentries,'','',$ENV{'form.register'}));
160: $r->print('<script>window.focus();</script>');
161:
162: $r->rflush();
163:
164: # Now that we've displayed some stuff to the user, init the navmap
165: $navmap->init();
166:
167: $r->rflush();
168:
169: # Check that it's defined
170: if (!($navmap->courseMapDefined())) {
171: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
172: '</body></html>');
173: return OK;
174: }
175:
176: # See if there's only one map in the top-level, if we don't
177: # already have a filter... if so, automatically display it
178: if ($ENV{QUERY_STRING} !~ /filter/) {
179: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
180: my $depth = 1;
181: $iterator->next();
182: my $curRes = $iterator->next();
183: my $sequenceCount = 0;
184: my $sequenceId;
185: while ($depth > 0) {
186: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
187: if ($curRes == $iterator->END_MAP()) { $depth--; }
188:
189: if (ref($curRes) && $curRes->is_sequence()) {
190: $sequenceCount++;
191: $sequenceId = $curRes->map_pc();
192: }
193:
194: $curRes = $iterator->next();
195: }
196:
197: if ($sequenceCount == 1) {
198: # The automatic iterator creation in the render call
199: # will pick this up. We know the condition because
200: # the defined($ENV{'form.filter'}) also ensures this
201: # is a fresh call.
202: $ENV{'form.filter'} = "$sequenceId";
203: }
204: }
205:
206: my $jumpToFirstHomework = 0;
207: # Check to see if the student is jumping to next open, do-able problem
208: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
209: $jumpToFirstHomework = 1;
210: # Find the next homework problem that they can do.
211: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
212: my $depth = 1;
213: $iterator->next();
214: my $curRes = $iterator->next();
215: my $foundDoableProblem = 0;
216: my $problemRes;
217:
218: while ($depth > 0 && !$foundDoableProblem) {
219: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
220: if ($curRes == $iterator->END_MAP()) { $depth--; }
221:
222: if (ref($curRes) && $curRes->is_problem()) {
223: my $status = $curRes->status();
224: if ($curRes->completable()) {
225: $problemRes = $curRes;
226: $foundDoableProblem = 1;
227:
228: # Pop open all previous maps
229: my $stack = $iterator->getStack();
230: pop @$stack; # last resource in the stack is the problem
231: # itself, which we don't need in the map stack
232: my @mapPcs = map {$_->map_pc()} @$stack;
233: $ENV{'form.filter'} = join(',', @mapPcs);
234:
235: # Mark as both "here" and "jump"
236: $ENV{'form.postsymb'} = $curRes->symb();
237: }
238: }
239: } continue {
240: $curRes = $iterator->next();
241: }
242:
243: # If we found no problems, print a note to that effect.
244: if (!$foundDoableProblem) {
245: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
246: }
247: } else {
248: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
249: "Go To My First Homework Problem</a> ");
250: }
251:
252: my $suppressEmptySequences = 0;
253: my $filterFunc = undef;
254: my $resource_no_folder_link = 0;
255:
256: # Display only due homework.
257: my $showOnlyHomework = 0;
258: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
259: $showOnlyHomework = 1;
260: $suppressEmptySequences = 1;
261: $filterFunc = sub { my $res = shift;
262: return $res->completable() || $res->is_map();
263: };
264: $r->print("<p><font size='+2'>Uncompleted Homework</font></p>");
265: $ENV{'form.filter'} = '';
266: $ENV{'form.condition'} = 1;
267: $resource_no_folder_link = 1;
268: } else {
269: $r->print("<a href='navmaps?showOnlyHomework'>" .
270: "Show Only Uncompleted Homework</a> ");
271: }
272:
273: # renderer call
274: my $renderArgs = { 'cols' => [0,1,2,3],
275: 'url' => '/adm/navmaps',
276: 'navmap' => $navmap,
277: 'suppressNavmap' => 1,
278: 'suppressEmptySequences' => $suppressEmptySequences,
279: 'filterFunc' => $filterFunc,
280: 'resource_no_folder_link' => $resource_no_folder_link,
281: 'r' => $r};
282: my $render = render($renderArgs);
283: $navmap->untieHashes();
284:
285: # If no resources were printed, print a reassuring message so the
286: # user knows there was no error.
287: if ($renderArgs->{'counter'} == 0) {
288: if ($showOnlyHomework) {
289: $r->print("<p><font size='+1'>All homework is currently completed.</font></p>");
290: } else { # both jumpToFirstHomework and normal use the same: course must be empty
291: $r->print("<p><font size='+1'>This course is empty.</font></p>");
292: }
293: }
294:
295: $r->print("</body></html>");
296: $r->rflush();
297:
298: return OK;
299: }
300:
301: # Convenience functions: Returns a string that adds or subtracts
302: # the second argument from the first hash, appropriate for the
303: # query string that determines which folders to recurse on
304: sub addToFilter {
305: my $hashIn = shift;
306: my $addition = shift;
307: my %hash = %$hashIn;
308: $hash{$addition} = 1;
309:
310: return join (",", keys(%hash));
311: }
312:
313: sub removeFromFilter {
314: my $hashIn = shift;
315: my $subtraction = shift;
316: my %hash = %$hashIn;
317:
318: delete $hash{$subtraction};
319: return join(",", keys(%hash));
320: }
321:
322: # Convenience function: Given a stack returned from getStack on the iterator,
323: # return the correct src() value.
324: # Later, this should add an anchor when we start putting anchors in pages.
325: sub getLinkForResource {
326: my $stack = shift;
327: my $res;
328:
329: # Check to see if there are any pages in the stack
330: foreach $res (@$stack) {
331: if (defined($res) && $res->is_page()) {
332: return $res->src();
333: }
334: }
335:
336: # Failing that, return the src of the last resource that is defined
337: # (when we first recurse on a map, it puts an undefined resource
338: # on the bottom because $self->{HERE} isn't defined yet, and we
339: # want the src for the map anyhow)
340: foreach (@$stack) {
341: if (defined($_)) { $res = $_; }
342: }
343:
344: return $res->src();
345: }
346:
347: # Convenience function: This seperates the logic of how to create
348: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
349: # etc.) into a seperate function. It takes a resource object as the
350: # first parameter, and the part number of the resource as the second.
351: # It's basically a big switch statement on the status of the resource.
352:
353: sub getDescription {
354: my $res = shift;
355: my $part = shift;
356: my $status = $res->status($part);
357:
358: if ($status == $res->NETWORK_FAILURE) {
359: return "Having technical difficulties; please check status later";
360: }
361: if ($status == $res->NOTHING_SET) {
362: return "Not currently assigned.";
363: }
364: if ($status == $res->OPEN_LATER) {
365: return "Open " . timeToHumanString($res->opendate($part));
366: }
367: if ($status == $res->OPEN) {
368: if ($res->duedate($part)) {
369: return "Due " . timeToHumanString($res->duedate($part));
370: } else {
371: return "Open, no due date";
372: }
373: }
374: if ($status == $res->PAST_DUE_ANSWER_LATER) {
375: return "Answer open " . timeToHumanString($res->answerdate($part));
376: }
377: if ($status == $res->PAST_DUE_NO_ANSWER) {
378: return "Was due " . timeToHumanString($res->duedate($part));
379: }
380: if ($status == $res->ANSWER_OPEN) {
381: return "Answer available";
382: }
383: if ($status == $res->EXCUSED) {
384: return "Excused by instructor";
385: }
386: if ($status == $res->ATTEMPTED) {
387: return "Answer submitted, not yet graded.";
388: }
389: if ($status == $res->TRIES_LEFT) {
390: my $tries = $res->tries($part);
391: my $maxtries = $res->maxtries($part);
392: my $triesString = "";
393: if ($tries && $maxtries) {
394: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
395: if ($maxtries > 1 && $maxtries - $tries == 1) {
396: $triesString = "<b>$triesString</b>";
397: }
398: }
399: if ($res->duedate()) {
400: return "Due " . timeToHumanString($res->duedate($part)) .
401: " $triesString";
402: } else {
403: return "No due date $triesString";
404: }
405: }
406: if ($status == $res->ANSWER_SUBMITTED) {
407: return 'Answer submitted';
408: }
409: }
410:
411: # Convenience function, so others can use it: Is the problem due in less then
412: # 24 hours, and still can be done?
413:
414: sub dueInLessThen24Hours {
415: my $res = shift;
416: my $part = shift;
417: my $status = $res->status($part);
418:
419: return ($status == $res->OPEN() ||
420: $status == $res->TRIES_LEFT()) &&
421: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
422: $res->duedate() > time();
423: }
424:
425: # Convenience function, so others can use it: Is there only one try remaining for the
426: # part, with more then one try to begin with, not due yet and still can be done?
427: sub lastTry {
428: my $res = shift;
429: my $part = shift;
430:
431: my $tries = $res->tries($part);
432: my $maxtries = $res->maxtries($part);
433: return $tries && $maxtries && $maxtries > 1 &&
434: $maxtries - $tries == 1 && $res->duedate() &&
435: $res->duedate() > time();
436: }
437:
438: # This puts a human-readable name on the ENV variable.
439:
440: sub advancedUser {
441: return $ENV{'request.role.adv'};
442: }
443:
444:
445: # timeToHumanString takes a time number and converts it to a
446: # human-readable representation, meant to be used in the following
447: # manner:
448: # print "Due $timestring"
449: # print "Open $timestring"
450: # print "Answer available $timestring"
451: # Very, very, very, VERY English-only... goodness help a localizer on
452: # this func...
453: sub timeToHumanString {
454: my ($time) = @_;
455: # zero, '0' and blank are bad times
456: if (!$time) {
457: return 'never';
458: }
459:
460: my $now = time();
461:
462: my @time = localtime($time);
463: my @now = localtime($now);
464:
465: # Positive = future
466: my $delta = $time - $now;
467:
468: my $minute = 60;
469: my $hour = 60 * $minute;
470: my $day = 24 * $hour;
471: my $week = 7 * $day;
472: my $inPast = 0;
473:
474: # Logic in comments:
475: # Is it now? (extremely unlikely)
476: if ( $delta == 0 ) {
477: return "this instant";
478: }
479:
480: if ($delta < 0) {
481: $inPast = 1;
482: $delta = -$delta;
483: }
484:
485: if ( $delta > 0 ) {
486:
487: my $tense = $inPast ? " ago" : "";
488: my $prefix = $inPast ? "" : "in ";
489:
490: # Less then a minute
491: if ( $delta < $minute ) {
492: if ($delta == 1) { return "${prefix}1 second$tense"; }
493: return "$prefix$delta seconds$tense";
494: }
495:
496: # Less then an hour
497: if ( $delta < $hour ) {
498: # If so, use minutes
499: my $minutes = floor($delta / 60);
500: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
501: return "$prefix$minutes minutes$tense";
502: }
503:
504: # Is it less then 24 hours away? If so,
505: # display hours + minutes
506: if ( $delta < $hour * 24) {
507: my $hours = floor($delta / $hour);
508: my $minutes = floor(($delta % $hour) / $minute);
509: my $hourString = "$hours hours";
510: my $minuteString = ", $minutes minutes";
511: if ($hours == 1) {
512: $hourString = "1 hour";
513: }
514: if ($minutes == 1) {
515: $minuteString = ", 1 minute";
516: }
517: if ($minutes == 0) {
518: $minuteString = "";
519: }
520: return "$prefix$hourString$minuteString$tense";
521: }
522:
523: # Less then 5 days away, display day of the week and
524: # HH:MM
525: if ( $delta < $day * 5 ) {
526: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
527: $timeStr =~ s/12:00 am/midnight/;
528: $timeStr =~ s/12:00 pm/noon/;
529: return ($inPast ? "last " : "next ") .
530: $timeStr;
531: }
532:
533: # Is it this year?
534: if ( $time[5] == $now[5]) {
535: # Return on Month Day, HH:MM meridian
536: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
537: $timeStr =~ s/12:00 am/midnight/;
538: $timeStr =~ s/12:00 pm/noon/;
539: return $timeStr;
540: }
541:
542: # Not this year, so show the year
543: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
544: $timeStr =~ s/12:00 am/midnight/;
545: $timeStr =~ s/12:00 pm/noon/;
546: return $timeStr;
547: }
548: }
549:
550:
551: =pod
552:
553: =head1 NAME
554:
555: Apache::lonnavmap - Subroutines to handle and render the navigation maps
556:
557: =head1 SYNOPSIS
558:
559: The main handler generates the navigational listing for the course,
560: the other objects export this information in a usable fashion for
561: other modules.
562:
563: =head1 Subroutine: render
564:
565: The navmap renderer package provides a sophisticated rendering of the
566: standard navigation maps interface into HTML. The provided nav map
567: handler is actually just a glorified call to this.
568:
569: Because of the large number of parameters this function presents,
570: instead of passing it arguments as is normal, pass it in an anonymous
571: hash with the given options. This is because there is no obvious order
572: you may wish to override these in and a hash is easier to read and
573: understand then "undef, undef, undef, 1, undef, undef, renderButton,
574: undef, 0" when you mostly want default behaviors.
575:
576: The package provides a function called 'render', called as
577: Apache::lonnavmaps::render({}).
578:
579: =head2 Overview of Columns
580:
581: The renderer will build an HTML table for the navmap and return
582: it. The table is consists of several columns, and a row for each
583: resource (or possibly each part). You tell the renderer how many
584: columns to create and what to place in each column, optionally using
585: one or more of the prepared columns, and the renderer will assemble
586: the table.
587:
588: Any additional generally useful column types should be placed in the
589: renderer code here, so anybody can use it anywhere else. Any code
590: specific to the current application (such as the addition of <input>
591: elements in a column) should be placed in the code of the thing using
592: the renderer.
593:
594: At the core of the renderer is the array reference COLS (see Example
595: section below for how to pass this correctly). The COLS array will
596: consist of entries of one of two types of things: Either an integer
597: representing one of the pre-packaged column types, or a sub reference
598: that takes a resource reference, a part number, and a reference to the
599: argument hash passed to the renderer, and returns a string that will
600: be inserted into the HTML representation as it.
601:
602: The pre-packaged column names are refered to by constants in the
603: Apache::lonnavmaps namespace. The following currently exist:
604:
605: =over 4
606:
607: =item * B<resource>:
608:
609: The general info about the resource: Link, icon for the type, etc. The
610: first column in the standard nav map display. This column also accepts
611: the following parameters in the renderer hash:
612:
613: =over 4
614:
615: =item * B<resource_nolink>:
616:
617: If true, the resource will not be linked. Default: false, resource
618: will have links.
619:
620: =item * B<resource_part_count>:
621:
622: If true (default), the resource will show a part count if the full
623: part list is not displayed. If false, the resource will never show a
624: part count.
625:
626: =item * B<resource_no_folder_link>:
627:
628: If true, the resource's folder will not be clickable to open or close
629: it. Default is false. True implies printCloseAll is false, since you
630: can't close or open folders when this is on anyhow.
631:
632: =back
633:
634: =item B<communication_status>:
635:
636: Whether there is discussion on the resource, email for the user, or
637: (lumped in here) perl errors in the execution of the problem. This is
638: the second column in the main nav map.
639:
640: =item B<quick_status>:
641:
642: An icon for the status of a problem, with four possible states:
643: Correct, incorrect, open, or none (not open yet, not a problem). The
644: third column of the standard navmap.
645:
646: =item B<long_status>:
647:
648: A text readout of the details of the current status of the problem,
649: such as "Due in 22 hours". The fourth column of the standard navmap.
650:
651: =back
652:
653: If you add any others please be sure to document them here.
654:
655: An example of a column renderer that will show the ID number of a
656: resource, along with the part name if any:
657:
658: sub {
659: my ($resource, $part, $params) = @_;
660: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
661: return '<td>' . $resource->{ID} . '</td>';
662: }
663:
664: Note these functions are responsible for the TD tags, which allow them
665: to override vertical and horizontal alignment, etc.
666:
667: =head2 Parameters
668:
669: Most of these parameters are only useful if you are *not* using the
670: folder interface (i.e., the default first column), which is probably
671: the common case. If you are using this interface, then you should be
672: able to get away with just using 'cols' (to specify the columns
673: shown), 'url' (necessary for the folders to link to the current screen
674: correctly), and possibly 'queryString' if your app calls for it. In
675: that case, maintaining the state of the folders will be done
676: automatically.
677:
678: =over 4
679:
680: =item * B<iterator>:
681:
682: A reference to a fresh ::iterator to use from the navmaps. The
683: rendering will reflect the options passed to the iterator, so you can
684: use that to just render a certain part of the course, if you like. If
685: one is not passed, the renderer will attempt to construct one from
686: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
687: 'iterator_map' parameter if any.
688:
689: =item * B<iterator_map>:
690:
691: If you are letting the renderer do the iterator handling, you can
692: instruct the renderer to render only a particular map by passing it
693: the source of the map you want to process, like
694: '/res/103/jerf/navmap.course.sequence'.
695:
696: =item * B<navmap>:
697:
698: A reference to a navmap, used only if an iterator is not passed in. If
699: this is necessary to make an iterator but it is not passed in, a new
700: one will be constructed based on ENV info. This is useful to do basic
701: error checking before passing it off to render.
702:
703: =item * B<r>:
704:
705: The standard Apache response object. This must be passed to the
706: renderer or the course hash will be locked.
707:
708: =item * B<cols>:
709:
710: An array reference
711:
712: =item * B<showParts>:
713:
714: A flag. If yes (default), a line for the resource itself, and a line
715: for each part will be displayed. If not, only one line for each
716: resource will be displayed.
717:
718: =item * B<condenseParts>:
719:
720: A flag. If yes (default), if all parts of the problem have the same
721: status and that status is Nothing Set, Correct, or Network Failure,
722: then only one line will be displayed for that resource anyhow. If no,
723: all parts will always be displayed. If showParts is 0, this is
724: ignored.
725:
726: =item * B<jumpCount>:
727:
728: A string identifying the URL to place the anchor 'curloc' at. Default
729: to no anchor at all. It is the responsibility of the renderer user to
730: ensure that the #curloc is in the URL. By default, determined through
731: the use of the ENV{} 'jump' information, and should normally "just
732: work" correctly.
733:
734: =item * B<here>:
735:
736: A Symb identifying where to place the 'here' marker. Default empty,
737: which means no marker.
738:
739: =item * B<indentString>:
740:
741: A string identifying the indentation string to use. By default, this
742: is a 25 pixel whitespace image with no alt text.
743:
744: =item * B<queryString>:
745:
746: A string which will be prepended to the query string used when the
747: folders are opened or closed.
748:
749: =item * B<url>:
750:
751: The url the folders will link to, which should be the current
752: page. Required if the resource info column is shown.
753:
754: =item * B<currentJumpIndex>:
755:
756: Describes the currently-open row number to cause the browser to jump
757: to, because the user just opened that folder. By default, pulled from
758: the Jump information in the ENV{'form.*'}.
759:
760: =item * B<printKey>:
761:
762: If true, print the key that appears on the top of the standard
763: navmaps. Default is false.
764:
765: =item * B<printCloseAll>:
766:
767: If true, print the "Close all folders" or "open all folders"
768: links. Default is true.
769:
770: =item * B<filterFunc>:
771:
772: A function that takes the resource object as its only parameter and
773: returns a true or false value. If true, the resource is displayed. If
774: false, it is simply skipped in the display. By default, all resources
775: are shown.
776:
777: =item * B<suppressEmptySequences>:
778:
779: If you're using a filter function, and displaying sequences to orient
780: the user, then frequently some sequences will be empty. Setting this to
781: true will cause those sequences not to display, so as not to confuse the
782: user into thinking that if the sequence is there there should be things
783: under it.
784:
785: =item * B<suppressNavmaps>:
786:
787: If true, will not display Navigate Content resources. Default to
788: false.
789:
790: =back
791:
792: =head2 Additional Info
793:
794: In addition to the parameters you can pass to the renderer, which will
795: be passed through unchange to the column renderers, the renderer will
796: generate the following information which your renderer may find
797: useful:
798:
799: If you want to know how many rows were printed, the 'counter' element
800: of the hash passed into the render function will contain the
801: count. You may want to check whether any resources were printed at
802: all.
803:
804: =over 4
805:
806: =back
807:
808: =cut
809:
810: sub resource { return 0; }
811: sub communication_status { return 1; }
812: sub quick_status { return 2; }
813: sub long_status { return 3; }
814:
815: # Data for render_resource
816:
817: sub render_resource {
818: my ($resource, $part, $params) = @_;
819:
820: my $nonLinkedText = ''; # stuff after resource title not in link
821:
822: my $link = $params->{"resourceLink"};
823: my $src = $resource->src();
824: my $it = $params->{"iterator"};
825: my $filter = $it->{FILTER};
826:
827: my $title = $resource->compTitle();
828: if ($src =~ /^\/uploaded\//) {
829: $nonLinkedText=$title;
830: $title = '';
831: }
832: my $partLabel = "";
833: my $newBranchText = "";
834:
835: # If this is a new branch, label it so
836: if ($params->{'isNewBranch'}) {
837: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
838: }
839:
840: # links to open and close the folder
841: my $linkopen = "<a href='$link'>";
842: my $linkclose = "</a>";
843:
844: # Default icon: unknown page
845: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
846:
847: if ($resource->is_problem()) {
848: if ($part eq '0' || $params->{'condensed'}) {
849: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
850: } else {
851: $icon = $params->{'indentString'};
852: }
853: } else {
854: my $curfext= (split (/\./,$resource->src))[-1];
855: my $embstyle = &Apache::loncommon::fileembstyle($curfext);
856: # The unless conditional that follows is a bit of overkill
857: if (!(!defined($embstyle) || $embstyle eq 'unk' || $embstyle eq 'hdn')) {
858: $icon = "<img src='/adm/lonIcons/$curfext.gif' alt='' border='0' />";
859: }
860: }
861:
862: # Display the correct map icon to open or shut map
863: if ($resource->is_map()) {
864: my $mapId = $resource->map_pc();
865: my $nowOpen = !defined($filter->{$mapId});
866: if ($it->{CONDITION}) {
867: $nowOpen = !$nowOpen;
868: }
869:
870: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
871:
872: if (!$params->{'resource_no_folder_link'}) {
873: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
874: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
875:
876: $linkopen = "<a href='" . $params->{'url'} . '?' .
877: $params->{'queryString'} . '&filter=';
878: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
879: addToFilter($filter, $mapId) :
880: removeFromFilter($filter, $mapId);
881: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
882: . $params->{'hereType'} . '&here=' .
883: &Apache::lonnet::escape($params->{'here'}) .
884: '&jump=' .
885: &Apache::lonnet::escape($resource->symb()) .
886: "&folderManip=1'>";
887: } else {
888: # Don't allow users to manipulate folder
889: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
890: '.nomanip.gif';
891: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
892:
893: $linkopen = "";
894: $linkclose = "";
895: }
896: }
897:
898: if ($resource->randomout()) {
899: $nonLinkedText .= ' <i>(hidden)</i> ';
900: }
901:
902: # We're done preparing and finally ready to start the rendering
903: my $result = "<td align='left' valign='center'>";
904:
905: my $indentLevel = $params->{'indentLevel'};
906: if ($newBranchText) { $indentLevel--; }
907:
908: # print indentation
909: for (my $i = 0; $i < $indentLevel; $i++) {
910: $result .= $params->{'indentString'};
911: }
912:
913: # Decide what to display
914: $result .= "$newBranchText$linkopen$icon$linkclose";
915:
916: my $curMarkerBegin = '';
917: my $curMarkerEnd = '';
918:
919: # Is this the current resource?
920: if (!$params->{'displayedHereMarker'} &&
921: $resource->symb() eq $params->{'here'} ) {
922: $curMarkerBegin = '<font color="red" size="+2">> </font>';
923: $curMarkerEnd = '<font color="red" size="+2"><</font>';
924: $params->{'displayedHereMarker'} = 1;
925: }
926:
927: if ($resource->is_problem() && $part ne '0' &&
928: !$params->{'condensed'}) {
929: $partLabel = " (Part $part)";
930: $title = "";
931: }
932:
933: if ($params->{'condensed'} && $resource->countParts() > 1) {
934: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
935: }
936:
937: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\// &&
938: !$resource->is_sequence()) {
939: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
940: } else {
941: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
942: }
943:
944: return $result;
945: }
946:
947: sub render_communication_status {
948: my ($resource, $part, $params) = @_;
949: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
950:
951: my $link = $params->{"resourceLink"};
952: my $linkopen = "<a href='$link'>";
953: my $linkclose = "</a>";
954:
955: if ($resource->hasDiscussion()) {
956: $discussionHTML = $linkopen .
957: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
958: $linkclose;
959: }
960:
961: if ($resource->getFeedback()) {
962: my $feedback = $resource->getFeedback();
963: foreach (split(/\,/, $feedback)) {
964: if ($_) {
965: $feedbackHTML .= ' <a href="/adm/email?display='
966: . &Apache::lonnet::escape($_) . '">'
967: . '<img src="/adm/lonMisc/feedback.gif" '
968: . 'border="0" /></a>';
969: }
970: }
971: }
972:
973: if ($resource->getErrors()) {
974: my $errors = $resource->getErrors();
975: foreach (split(/,/, $errors)) {
976: if ($_) {
977: $errorHTML .= ' <a href="/adm/email?display='
978: . &Apache::lonnet::escape($_) . '">'
979: . '<img src="/adm/lonMisc/bomb.gif" '
980: . 'border="0" /></a>';
981: }
982: }
983: }
984:
985: if ($params->{'multipart'} && $part != '0') {
986: $discussionHTML = $feedbackHTML = $errorHTML = '';
987: }
988:
989: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
990:
991: }
992: sub render_quick_status {
993: my ($resource, $part, $params) = @_;
994: my $result = "";
995: my $firstDisplayed = !$params->{'condensed'} &&
996: $params->{'multipart'} && $part eq "0";
997:
998: my $link = $params->{"resourceLink"};
999: my $linkopen = "<a href='$link'>";
1000: my $linkclose = "</a>";
1001:
1002: if ($resource->is_problem() &&
1003: !$firstDisplayed) {
1004: my $icon = $statusIconMap{$resource->status($part)};
1005: my $alt = $iconAltTags{$icon};
1006: if ($icon) {
1007: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1008: } else {
1009: $result .= "<td width='30'> </td>\n";
1010: }
1011: } else { # not problem, no icon
1012: $result .= "<td width='30'> </td>\n";
1013: }
1014:
1015: return $result;
1016: }
1017: sub render_long_status {
1018: my ($resource, $part, $params) = @_;
1019: my $result = "<td align='right' valign='center'>\n";
1020: my $firstDisplayed = !$params->{'condensed'} &&
1021: $params->{'multipart'} && $part eq "0";
1022:
1023: my $color;
1024: if ($resource->is_problem()) {
1025: $color = $colormap{$resource->status};
1026:
1027: if (dueInLessThen24Hours($resource, $part) ||
1028: lastTry($resource, $part)) {
1029: $color = $hurryUpColor;
1030: }
1031: }
1032:
1033: if ($resource->kind() eq "res" &&
1034: $resource->is_problem() &&
1035: !$firstDisplayed) {
1036: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1037: $result .= getDescription($resource, $part);
1038: if ($color) {$result .= "</b></font>"; }
1039: }
1040: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1041: $result .= '(randomly select ' . $resource->randompick() .')';
1042: }
1043:
1044: $result .= "</td>\n";
1045:
1046: return $result;
1047: }
1048:
1049: my @preparedColumns = (\&render_resource, \&render_communication_status,
1050: \&render_quick_status, \&render_long_status);
1051:
1052: sub setDefault {
1053: my ($val, $default) = @_;
1054: if (!defined($val)) { return $default; }
1055: return $val;
1056: }
1057:
1058: sub render {
1059: my $args = shift;
1060: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1061: my $result = '';
1062:
1063: # Configure the renderer.
1064: my $cols = $args->{'cols'};
1065: if (!defined($cols)) {
1066: # no columns, no nav maps.
1067: return '';
1068: }
1069: my $mustCloseNavMap = 0;
1070: my $navmap;
1071: if (defined($args->{'navmap'})) {
1072: $navmap = $args->{'navmap'};
1073: }
1074:
1075: my $r = $args->{'r'};
1076: my $queryString = $args->{'queryString'};
1077: my $jump = $args->{'jump'};
1078: my $here = $args->{'here'};
1079: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1080: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1081: # before the current resource when using #current
1082:
1083: # If we were passed 'here' information, we are not rendering
1084: # after a folder manipulation, and we were not passed an
1085: # iterator, make sure we open the folders to show the "here"
1086: # marker
1087: my $filterHash = {};
1088: # Figure out what we're not displaying
1089: foreach (split(/\,/, $ENV{"form.filter"})) {
1090: if ($_) {
1091: $filterHash->{$_} = "1";
1092: }
1093: }
1094:
1095: # Filter: Remember filter function and add our own filter: Refuse
1096: # to show hidden resources unless the user can see them.
1097: my $userCanSeeHidden = advancedUser();
1098: my $filterFunc = setDefault($args->{'filterFunc'},
1099: sub {return 1;});
1100: if (!$userCanSeeHidden) {
1101: # Without renaming the filterfunc, the server seems to go into
1102: # an infinite loop
1103: my $oldFilterFunc = $filterFunc;
1104: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1105: &$oldFilterFunc($res);};
1106: }
1107:
1108: my $condition = 0;
1109: if ($ENV{'form.condition'}) {
1110: $condition = 1;
1111: }
1112:
1113: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1114: # Step 1: Check to see if we have a navmap
1115: if (!defined($navmap)) {
1116: $navmap = Apache::lonnavmaps::navmap->new(
1117: $ENV{"request.course.fn"}.".db",
1118: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1119: $mustCloseNavMap = 1;
1120: }
1121: $navmap->init();
1122:
1123: # Step two: Locate what kind of here marker is necessary
1124: # Determine where the "here" marker is and where the screen jumps to.
1125:
1126: if ($ENV{'form.postsymb'}) {
1127: $here = $jump = $ENV{'form.postsymb'};
1128: } elsif ($ENV{'form.postdata'}) {
1129: # couldn't find a symb, is there a URL?
1130: my $currenturl = $ENV{'form.postdata'};
1131: #$currenturl=~s/^http\:\/\///;
1132: #$currenturl=~s/^[^\/]+//;
1133:
1134: $here = $jump = &Apache::lonnet::symbread($currenturl);
1135: }
1136:
1137: # Step three: Ensure the folders are open
1138: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1139: my $depth = 1;
1140: $mapIterator->next(); # discard the first BEGIN_MAP
1141: my $curRes = $mapIterator->next();
1142: my $found = 0;
1143:
1144: # We only need to do this if we need to open the maps to show the
1145: # current position. This will change the counter so we can't count
1146: # for the jump marker with this loop.
1147: while ($depth > 0 && !$found) {
1148: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1149: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1150:
1151: if (ref($curRes) && $curRes->symb() eq $here) {
1152: my $mapStack = $mapIterator->getStack();
1153:
1154: # Ensure the parent maps are open
1155: for my $map (@{$mapStack}) {
1156: if ($condition) {
1157: undef $filterHash->{$map->map_pc()};
1158: } else {
1159: $filterHash->{$map->map_pc()} = 1;
1160: }
1161: }
1162: $found = 1;
1163: }
1164:
1165: $curRes = $mapIterator->next();
1166: }
1167: }
1168:
1169: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1170: # If this is a click on a folder or something, we want to preserve the "here"
1171: # from the querystring, and get the new "jump" marker
1172: $here = $ENV{'form.here'};
1173: $jump = $ENV{'form.jump'};
1174: }
1175:
1176: my $it = $args->{'iterator'};
1177: if (!defined($it)) {
1178: # Construct a default iterator based on $ENV{'form.'} information
1179:
1180: # Step 1: Check to see if we have a navmap
1181: if (!defined($navmap)) {
1182: $navmap = Apache::lonnavmaps::navmap->new($r,
1183: $ENV{"request.course.fn"}.".db",
1184: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1185: $mustCloseNavMap = 1;
1186: }
1187: # Paranoia: Make sure it's ready
1188: $navmap->init();
1189:
1190: # See if we're being passed a specific map
1191: if ($args->{'iterator_map'}) {
1192: my $map = $args->{'iterator_map'};
1193: $map = $navmap->getResourceByUrl($map);
1194: my $firstResource = $map->map_start();
1195: my $finishResource = $map->map_finish();
1196:
1197: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1198: } else {
1199: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1200: }
1201: }
1202:
1203: # (re-)Locate the jump point, if any
1204: # Note this does not take filtering or hidden into account... need
1205: # to be fixed?
1206: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1207: my $depth = 1;
1208: $mapIterator->next();
1209: my $curRes = $mapIterator->next();
1210: my $foundJump = 0;
1211: my $counter = 0;
1212:
1213: while ($depth > 0 && !$foundJump) {
1214: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1215: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1216: if (ref($curRes)) { $counter++; }
1217:
1218: if (ref($curRes) && $jump eq $curRes->symb()) {
1219:
1220: # This is why we have to use the main iterator instead of the
1221: # potentially faster DFS: The count has to be the same, so
1222: # the order has to be the same, which DFS won't give us.
1223: $args->{'currentJumpIndex'} = $counter;
1224: $foundJump = 1;
1225: }
1226:
1227: $curRes = $mapIterator->next();
1228: }
1229:
1230: my $showParts = setDefault($args->{'showParts'}, 1);
1231: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1232: # keeps track of when the current resource is found,
1233: # so we can back up a few and put the anchor above the
1234: # current resource
1235: my $printKey = $args->{'printKey'};
1236: my $printCloseAll = $args->{'printCloseAll'};
1237: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1238:
1239: # Print key?
1240: if ($printKey) {
1241: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1242: my $date=localtime;
1243: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1244: if ($navmap->{LAST_CHECK}) {
1245: $result .=
1246: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1247: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1248: '</td><td align="center" valign="bottom"> '.
1249: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1250: '</td>';
1251: } else {
1252: $result .= '<td align="center" valign="bottom"> '.
1253: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1254: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1255: '</td>';
1256: }
1257:
1258: $result .= '</tr></table>';
1259: }
1260:
1261: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1262: if ($condition) {
1263: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1264: "&here=" . Apache::lonnet::escape($here) .
1265: "\">Close All Folders</a>";
1266: } else {
1267: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1268: "&here=" . Apache::lonnet::escape($here) .
1269: "\">Open All Folders</a>";
1270: }
1271: $result .= "<br /><br />\n";
1272: }
1273:
1274: if ($r) {
1275: $r->print($result);
1276: $r->rflush();
1277: $result = "";
1278: }
1279: # End parameter setting
1280:
1281: # Data
1282: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1283: my $res = "Apache::lonnavmaps::resource";
1284: my %condenseStatuses =
1285: ( $res->NETWORK_FAILURE => 1,
1286: $res->NOTHING_SET => 1,
1287: $res->CORRECT => 1 );
1288: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1289:
1290: # Shared variables
1291: $args->{'counter'} = 0; # counts the rows
1292: $args->{'indentLevel'} = 0;
1293: $args->{'isNewBranch'} = 0;
1294: $args->{'condensed'} = 0;
1295: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1296: $args->{'displayedHereMarker'} = 0;
1297:
1298: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1299: # since structure actually doesn't matter, except what map has what resources.
1300: if ($args->{'suppressEmptySequences'}) {
1301: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1302: $it->{FIRST_RESOURCE},
1303: $it->{FINISH_RESOURCE},
1304: {}, undef, 1);
1305: $depth = 0;
1306: $dfsit->next();
1307: my $curRes = $dfsit->next();
1308: while ($depth > -1) {
1309: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1310: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1311:
1312: if (ref($curRes)) {
1313: # Parallel pre-processing: Do sequences have non-filtered-out children?
1314: if ($curRes->is_map()) {
1315: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1316: # Sequences themselves do not count as visible children,
1317: # unless those sequences also have visible children.
1318: # This means if a sequence appears, there's a "promise"
1319: # that there's something under it if you open it, somewhere.
1320: } else {
1321: # Not a sequence: if it's filtered, ignore it, otherwise
1322: # rise up the stack and mark the sequences as having children
1323: if (&$filterFunc($curRes)) {
1324: for my $sequence (@{$dfsit->getStack()}) {
1325: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1326: }
1327: }
1328: }
1329: }
1330: } continue {
1331: $curRes = $dfsit->next();
1332: }
1333: }
1334:
1335: my $displayedJumpMarker = 0;
1336: # Set up iteration.
1337: $depth = 1;
1338: $it->next(); # discard initial BEGIN_MAP
1339: $curRes = $it->next();
1340: my $now = time();
1341: my $in24Hours = $now + 24 * 60 * 60;
1342: my $rownum = 0;
1343:
1344: # export "here" marker information
1345: $args->{'here'} = $here;
1346:
1347: while ($depth > 0) {
1348: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1349: if ($curRes == $it->END_MAP()) { $depth--; }
1350:
1351: # Maintain indentation level.
1352: if ($curRes == $it->BEGIN_MAP() ||
1353: $curRes == $it->BEGIN_BRANCH() ) {
1354: $args->{'indentLevel'}++;
1355: }
1356: if ($curRes == $it->END_MAP() ||
1357: $curRes == $it->END_BRANCH() ) {
1358: $args->{'indentLevel'}--;
1359: }
1360: # Notice new branches
1361: if ($curRes == $it->BEGIN_BRANCH()) {
1362: $args->{'isNewBranch'} = 1;
1363: }
1364:
1365: # If this isn't an actual resource, continue on
1366: if (!ref($curRes)) {
1367: next;
1368: }
1369:
1370: # If this has been filtered out, continue on
1371: if (!(&$filterFunc($curRes))) {
1372: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1373: next;
1374: }
1375:
1376: # If this is an empty sequence and we're filtering them, continue on
1377: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1378: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1379: next;
1380: }
1381:
1382: # If we're suppressing navmaps and this is a navmap, continue on
1383: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1384: next;
1385: }
1386:
1387: $args->{'counter'}++;
1388:
1389: # Does it have multiple parts?
1390: $args->{'multipart'} = 0;
1391: $args->{'condensed'} = 0;
1392: my @parts;
1393:
1394: # Decide what parts to show.
1395: if ($curRes->is_problem() && $showParts) {
1396: @parts = @{$curRes->parts()};
1397: $args->{'multipart'} = $curRes->multipart();
1398:
1399: if ($condenseParts) { # do the condensation
1400: if (!$curRes->opendate("0")) {
1401: @parts = ();
1402: $args->{'condensed'} = 1;
1403: }
1404: if (!$args->{'condensed'}) {
1405: # Decide whether to condense based on similarity
1406: my $status = $curRes->status($parts[0]);
1407: my $due = $curRes->duedate($parts[0]);
1408: my $open = $curRes->opendate($parts[0]);
1409: my $statusAllSame = 1;
1410: my $dueAllSame = 1;
1411: my $openAllSame = 1;
1412: for (my $i = 1; $i < scalar(@parts); $i++) {
1413: if ($curRes->status($parts[$i]) != $status){
1414: $statusAllSame = 0;
1415: }
1416: if ($curRes->duedate($parts[$i]) != $due ) {
1417: $dueAllSame = 0;
1418: }
1419: if ($curRes->opendate($parts[$i]) != $open) {
1420: $openAllSame = 0;
1421: }
1422: }
1423: # $*allSame is true if all the statuses were
1424: # the same. Now, if they are all the same and
1425: # match one of the statuses to condense, or they
1426: # are all open with the same due date, or they are
1427: # all OPEN_LATER with the same open date, display the
1428: # status of the first non-zero part (to get the 'correct'
1429: # status right, since 0 is never 'correct' or 'open').
1430: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1431: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1432: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1433: @parts = ($parts[0]);
1434: $args->{'condensed'} = 1;
1435: }
1436: }
1437: # Multipart problem with one part: always "condense" (happens
1438: # to match the desirable behavior)
1439: if ($curRes->countParts() == 1) {
1440: @parts = ($parts[0]);
1441: $args->{'condensed'} = 1;
1442: }
1443: }
1444: }
1445:
1446: # If the multipart problem was condensed, "forget" it was multipart
1447: if (scalar(@parts) == 1) {
1448: $args->{'multipart'} = 0;
1449: } else {
1450: # Add part 0 so we display it correctly.
1451: unshift @parts, '0';
1452: }
1453:
1454: # Now, we've decided what parts to show. Loop through them and
1455: # show them.
1456: foreach my $part (@parts) {
1457: $rownum ++;
1458: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1459:
1460: $result .= " <tr bgcolor='$backgroundColor'>\n";
1461:
1462: # Set up some data about the parts that the cols might want
1463: my $filter = $it->{FILTER};
1464: my $stack = $it->getStack();
1465: my $src = getLinkForResource($stack);
1466:
1467: my $srcHasQuestion = $src =~ /\?/;
1468: $args->{"resourceLink"} = $src.
1469: ($srcHasQuestion?'&':'?') .
1470: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1471:
1472: # Now, display each column.
1473: foreach my $col (@$cols) {
1474: my $colHTML = '';
1475: if (ref($col)) {
1476: $colHTML .= &$col($curRes, $part, $args);
1477: } else {
1478: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1479: }
1480:
1481: # If this is the first column and it's time to print
1482: # the anchor, do so
1483: if ($col == $cols->[0] &&
1484: $args->{'counter'} == $args->{'currentJumpIndex'} -
1485: $currentJumpDelta) {
1486: # Jam the anchor after the <td> tag;
1487: # necessary for valid HTML (which Mozilla requires)
1488: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1489: $displayedJumpMarker = 1;
1490: }
1491: $result .= $colHTML . "\n";
1492: }
1493: $result .= " </tr>\n";
1494: $args->{'isNewBranch'} = 0;
1495: }
1496:
1497: if ($r && $rownum % 20 == 0) {
1498: $r->print($result);
1499: $result = "";
1500: $r->rflush();
1501: }
1502: } continue {
1503: $curRes = $it->next();
1504:
1505: if ($r) {
1506: # If we have the connection, make sure the user is still connected
1507: my $c = $r->connection;
1508: if ($c->aborted()) {
1509: Apache::lonnet::logthis("navmaps aborted");
1510: # Who cares what we do, nobody will see it anyhow.
1511: return '';
1512: }
1513: }
1514: }
1515:
1516: # Print out the part that jumps to #curloc if it exists
1517: # delay needed because the browser is processing the jump before
1518: # it finishes rendering, so it goes to the wrong place!
1519: # onload might be better, but this routine has no access to that.
1520: # On mozilla, the 0-millisecond timeout seems to prevent this;
1521: # it's quite likely this might fix other browsers, too, and
1522: # certainly won't hurt anything.
1523: if ($displayedJumpMarker) {
1524: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1525: }
1526:
1527: $result .= "</table>";
1528:
1529: if ($r) {
1530: $r->print($result);
1531: $result = "";
1532: $r->rflush();
1533: }
1534:
1535: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1536:
1537: return $result;
1538: }
1539:
1540: 1;
1541:
1542: package Apache::lonnavmaps::navmap;
1543:
1544: =pod
1545:
1546: lonnavmaps provides functions and objects for dealing with the
1547: compiled course hashes generated when a user enters the course, the
1548: Apache handler for the "Navigation Map" button, and a flexible
1549: prepared renderer for navigation maps that are easy to use anywhere.
1550:
1551: =head1 Object: navmap
1552:
1553: Encapsulating the compiled nav map
1554:
1555: navmap is an object that encapsulates a compiled course map and
1556: provides a reasonable interface to it.
1557:
1558: Most notably it provides a way to navigate the map sensibly and a
1559: flexible iterator that makes it easy to write various renderers based
1560: on nav maps.
1561:
1562: You must obtain resource objects through the navmap object.
1563:
1564: =head2 Methods
1565:
1566: =over 4
1567:
1568: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1569: genMailDiscussStatus, getUserData):
1570:
1571: Binds a new navmap object to the compiled nav map hash and parm hash
1572: given as filenames. genCourseAndUserOptions is a flag saying whether
1573: the course options and user options hash should be generated. This is
1574: for when you are using the parameters of the resources that require
1575: them; see documentation in resource object
1576: documentation. genMailDiscussStatus causes the nav map to retreive
1577: information about the email and discussion status of
1578: resources. Returns the navmap object if this is successful, or
1579: B<undef> if not. You must check for undef; errors will occur when you
1580: try to use the other methods otherwise. getUserData, if true, will
1581: retreive the user's performance data for various problems.
1582:
1583: =item * B<getIterator>(first, finish, filter, condition):
1584:
1585: See iterator documentation below.
1586:
1587: =cut
1588:
1589: use strict;
1590: use GDBM_File;
1591:
1592: sub new {
1593: # magic invocation to create a class instance
1594: my $proto = shift;
1595: my $class = ref($proto) || $proto;
1596: my $self = {};
1597:
1598: $self->{NAV_HASH_FILE} = shift;
1599: $self->{PARM_HASH_FILE} = shift;
1600: $self->{GENERATE_COURSE_USER_OPT} = shift;
1601: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1602: $self->{GET_USER_DATA} = shift;
1603:
1604: # Resource cache stores navmap resources as we reference them. We generate
1605: # them on-demand so we don't pay for creating resources unless we use them.
1606: $self->{RESOURCE_CACHE} = {};
1607:
1608: # Network failure flag, if we accessed the course or user opt and
1609: # failed
1610: $self->{NETWORK_FAILURE} = 0;
1611:
1612: # tie the nav hash
1613:
1614: my %navmaphash;
1615: my %parmhash;
1616: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1617: &GDBM_READER(), 0640))) {
1618: return undef;
1619: }
1620:
1621: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1622: &GDBM_READER(), 0640)))
1623: {
1624: untie %{$self->{PARM_HASH}};
1625: return undef;
1626: }
1627:
1628: $self->{NAV_HASH} = \%navmaphash;
1629: $self->{PARM_HASH} = \%parmhash;
1630: $self->{INITED} = 0;
1631:
1632: bless($self);
1633:
1634: return $self;
1635: }
1636:
1637: sub init {
1638: my $self = shift;
1639: if ($self->{INITED}) { return; }
1640:
1641: # If the course opt hash and the user opt hash should be generated,
1642: # generate them
1643: if ($self->{GENERATE_COURSE_USER_OPT}) {
1644: my $uname=$ENV{'user.name'};
1645: my $udom=$ENV{'user.domain'};
1646: my $uhome=$ENV{'user.home'};
1647: my $cid=$ENV{'request.course.id'};
1648: my $chome=$ENV{'course.'.$cid.'.home'};
1649: my ($cdom,$cnum)=split(/\_/,$cid);
1650:
1651: my $userprefix=$uname.'_'.$udom.'_';
1652:
1653: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1654: unless ($uhome eq 'no_host') {
1655: # ------------------------------------------------- Get coursedata (if present)
1656: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1657: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1658: ':resourcedata',$chome);
1659: # Check for network failure
1660: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1661: $self->{NETWORK_FAILURE} = 1;
1662: } elsif ($reply!~/^error\:/) {
1663: $courserdatas{$cid}=$reply;
1664: $courserdatas{$cid.'.last_cache'}=time;
1665: }
1666: }
1667: foreach (split(/\&/,$courserdatas{$cid})) {
1668: my ($name,$value)=split(/\=/,$_);
1669: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1670: &Apache::lonnet::unescape($value);
1671: }
1672: # --------------------------------------------------- Get userdata (if present)
1673: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1674: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1675: if ($reply!~/^error\:/) {
1676: $userrdatas{$uname.'___'.$udom}=$reply;
1677: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1678: }
1679: # check to see if network failed
1680: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1681: {
1682: $self->{NETWORK_FAILURE} = 1;
1683: }
1684: }
1685: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1686: my ($name,$value)=split(/\=/,$_);
1687: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1688: &Apache::lonnet::unescape($value);
1689: }
1690: $self->{COURSE_OPT} = \%courseopt;
1691: $self->{USER_OPT} = \%useropt;
1692: }
1693: }
1694:
1695: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1696: my $cid=$ENV{'request.course.id'};
1697: my ($cdom,$cnum)=split(/\_/,$cid);
1698:
1699: my %emailstatus = &Apache::lonnet::dump('email_status');
1700: my $logoutTime = $emailstatus{'logout'};
1701: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1702: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1703: $courseLeaveTime : $logoutTime);
1704: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1705: $cdom, $cnum);
1706: my %feedback=();
1707: my %error=();
1708: my $keys = &Apache::lonnet::reply('keys:'.
1709: $ENV{'user.domain'}.':'.
1710: $ENV{'user.name'}.':nohist_email',
1711: $ENV{'user.home'});
1712:
1713: foreach my $msgid (split(/\&/, $keys)) {
1714: $msgid=&Apache::lonnet::unescape($msgid);
1715: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1716: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1717: my ($what,$url)=($1,$2);
1718: my %status=
1719: &Apache::lonnet::get('email_status',[$msgid]);
1720: if ($status{$msgid}=~/^error\:/) {
1721: $status{$msgid}='';
1722: }
1723:
1724: if (($status{$msgid} eq 'new') ||
1725: (!$status{$msgid})) {
1726: if ($what eq 'Error') {
1727: $error{$url}.=','.$msgid;
1728: } else {
1729: $feedback{$url}.=','.$msgid;
1730: }
1731: }
1732: }
1733: }
1734:
1735: $self->{FEEDBACK} = \%feedback;
1736: $self->{ERROR_MSG} = \%error; # what is this? JB
1737: $self->{DISCUSSION_TIME} = \%discussiontime;
1738: $self->{EMAIL_STATUS} = \%emailstatus;
1739:
1740: }
1741:
1742: if ($self->{GET_USER_DATA}) {
1743: # Retreive performance data on problems
1744: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1745: $ENV{'user.domain'},
1746: $ENV{'user.name'});
1747: $self->{STUDENT_DATA} = \%student_data;
1748: }
1749:
1750: $self->{PARM_CACHE} = {};
1751: $self->{INITED} = 1;
1752: }
1753:
1754: # Internal function: Takes a key to look up in the nav hash and implements internal
1755: # memory caching of that key.
1756: sub navhash {
1757: my $self = shift; my $key = shift;
1758: return $self->{NAV_HASH}->{$key};
1759: }
1760:
1761: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1762: sub courseMapDefined {
1763: my $self = shift;
1764: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1765:
1766: my $firstres = $self->navhash("map_start_$uri");
1767: my $lastres = $self->navhash("map_finish_$uri");
1768: return $firstres && $lastres;
1769: }
1770:
1771: sub getIterator {
1772: my $self = shift;
1773: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1774: shift, undef, shift);
1775: return $iterator;
1776: }
1777:
1778: # unties the hash when done
1779: sub untieHashes {
1780: my $self = shift;
1781: untie %{$self->{NAV_HASH}};
1782: untie %{$self->{PARM_HASH}};
1783: }
1784:
1785: # Private method: Does the given resource (as a symb string) have
1786: # current discussion? Returns 0 if chat/mail data not extracted.
1787: sub hasDiscussion {
1788: my $self = shift;
1789: my $symb = shift;
1790: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1791:
1792: #return defined($self->{DISCUSSION_TIME}->{$symb});
1793: return $self->{DISCUSSION_TIME}->{$symb} >
1794: $self->{LAST_CHECK};
1795: }
1796:
1797: # Private method: Does the given resource (as a symb string) have
1798: # current feedback? Returns the string in the feedback hash, which
1799: # will be false if it does not exist.
1800: sub getFeedback {
1801: my $self = shift;
1802: my $symb = shift;
1803:
1804: if (!defined($self->{FEEDBACK})) { return ""; }
1805:
1806: return $self->{FEEDBACK}->{$symb};
1807: }
1808:
1809: # Private method: Get the errors for that resource (by source).
1810: sub getErrors {
1811: my $self = shift;
1812: my $src = shift;
1813:
1814: if (!defined($self->{ERROR_MSG})) { return ""; }
1815: return $self->{ERROR_MSG}->{$src};
1816: }
1817:
1818: =pod
1819:
1820: =item * B<getById>(id):
1821:
1822: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1823: object for that resource. This method, or other methods that use it
1824: (as in the resource object) is the only proper way to obtain a
1825: resource object.
1826:
1827: =item * B<getBySymb>(symb):
1828:
1829: Based on the symb of the resource, get a resource object for that
1830: resource. This is one of the proper ways to get a resource object.
1831:
1832: =item * B<getMapByMapPc>(map_pc):
1833:
1834: Based on the map_pc of the resource, get a resource object for
1835: the given map. This is one of the proper ways to get a resource object.
1836:
1837: =cut
1838:
1839: # The strategy here is to cache the resource objects, and only construct them
1840: # as we use them. The real point is to prevent reading any more from the tied
1841: # hash then we have to, which should hopefully alleviate speed problems.
1842: # Caching is just an incidental detail I throw in because it makes sense.
1843:
1844: sub getById {
1845: my $self = shift;
1846: my $id = shift;
1847:
1848: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1849: {
1850: return $self->{RESOURCE_CACHE}->{$id};
1851: }
1852:
1853: # resource handles inserting itself into cache.
1854: # Not clear why the quotes are necessary, but as of this
1855: # writing it doesn't work without them.
1856: return "Apache::lonnavmaps::resource"->new($self, $id);
1857: }
1858:
1859: sub getBySymb {
1860: my $self = shift;
1861: my $symb = shift;
1862: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1863: my $map = $self->getResourceByUrl($mapUrl);
1864: return $self->getById($map->map_pc() . '.' . $id);
1865: }
1866:
1867: sub getByMapPc {
1868: my $self = shift;
1869: my $map_pc = shift;
1870: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1871: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1872: return $self->getById($map_id);
1873: }
1874:
1875: =pod
1876:
1877: =item * B<firstResource>():
1878:
1879: Returns a resource object reference corresponding to the first
1880: resource in the navmap.
1881:
1882: =cut
1883:
1884: sub firstResource {
1885: my $self = shift;
1886: my $firstResource = $self->navhash('map_start_' .
1887: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1888: return $self->getById($firstResource);
1889: }
1890:
1891: =pod
1892:
1893: =item * B<finishResource>():
1894:
1895: Returns a resource object reference corresponding to the last resource
1896: in the navmap.
1897:
1898: =cut
1899:
1900: sub finishResource {
1901: my $self = shift;
1902: my $firstResource = $self->navhash('map_finish_' .
1903: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1904: return $self->getById($firstResource);
1905: }
1906:
1907: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1908: # the actual lookup; parmval caches the results.
1909: sub parmval {
1910: my $self = shift;
1911: my ($what,$symb)=@_;
1912: my $hashkey = $what."|||".$symb;
1913:
1914: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1915: return $self->{PARM_CACHE}->{$hashkey};
1916: }
1917:
1918: my $result = $self->parmval_real($what, $symb);
1919: $self->{PARM_CACHE}->{$hashkey} = $result;
1920: return $result;
1921: }
1922:
1923: sub parmval_real {
1924: my $self = shift;
1925: my ($what,$symb) = @_;
1926:
1927: my $cid=$ENV{'request.course.id'};
1928: my $csec=$ENV{'request.course.sec'};
1929: my $uname=$ENV{'user.name'};
1930: my $udom=$ENV{'user.domain'};
1931:
1932: unless ($symb) { return ''; }
1933: my $result='';
1934:
1935: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1936:
1937: # ----------------------------------------------------- Cascading lookup scheme
1938: my $rwhat=$what;
1939: $what=~s/^parameter\_//;
1940: $what=~s/\_/\./;
1941:
1942: my $symbparm=$symb.'.'.$what;
1943: my $mapparm=$mapname.'___(all).'.$what;
1944: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1945:
1946: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1947: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1948: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1949:
1950: my $courselevel= $usercourseprefix.'.'.$what;
1951: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1952: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1953:
1954: my $useropt = $self->{USER_OPT};
1955: my $courseopt = $self->{COURSE_OPT};
1956: my $parmhash = $self->{PARM_HASH};
1957:
1958: # ---------------------------------------------------------- first, check user
1959: if ($uname and defined($useropt)) {
1960: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1961: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1962: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1963: }
1964:
1965: # ------------------------------------------------------- second, check course
1966: if ($csec and defined($courseopt)) {
1967: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1968: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1969: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1970: }
1971:
1972: if (defined($courseopt)) {
1973: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1974: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1975: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1976: }
1977:
1978: # ----------------------------------------------------- third, check map parms
1979:
1980: my $thisparm=$$parmhash{$symbparm};
1981: if (defined($thisparm)) { return $thisparm; }
1982:
1983: # ----------------------------------------------------- fourth , check default
1984:
1985: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1986: if (defined($default)) { return $default}
1987:
1988: # --------------------------------------------------- fifth , cascade up parts
1989:
1990: my ($space,@qualifier)=split(/\./,$rwhat);
1991: my $qualifier=join('.',@qualifier);
1992: unless ($space eq '0') {
1993: my @parts=split(/_/,$space);
1994: my $id=pop(@parts);
1995: my $part=join('_',@parts);
1996: if ($part eq '') { $part='0'; }
1997: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1998: if (defined($partgeneral)) { return $partgeneral; }
1999: }
2000: return '';
2001: }
2002:
2003: =pod
2004:
2005: =item * B<getResourceByUrl>(url):
2006:
2007: Retrieves a resource object by URL of the resource. If passed a
2008: resource object, it will simply return it, so it is safe to use this
2009: method in code like "$res = $navmap->getResourceByUrl($res)", if
2010: you're not sure if $res is already an object, or just a URL. If the
2011: resource appears multiple times in the course, only the first instance
2012: will be returned. As a result, this is probably useful only for maps.
2013:
2014: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2015:
2016: The map is a specification of a map to retreive the resources from,
2017: either as a url or as an object. The filterFunc is a reference to a
2018: function that takes a resource object as its one argument and returns
2019: true if the resource should be included, or false if it should not
2020: be. If recursive is true, the map will be recursively examined,
2021: otherwise it will not be. If bailout is true, the function will return
2022: as soon as it finds a resource, if false it will finish. By default,
2023: the map is the top-level map of the course, filterFunc is a function
2024: that always returns 1, recursive is true, bailout is false. The
2025: resources will be returned in a list containing the resource objects
2026: for the corresponding resources, with B<no structure information> in
2027: the list; regardless of branching, recursion, etc., it will be a flat
2028: list.
2029:
2030: Thus, this is suitable for cases where you don't want the structure,
2031: just a list of all resources. It is also suitable for finding out how
2032: many resources match a given description; for this use, if all you
2033: want to know is if I<any> resources match the description, the bailout
2034: parameter will allow you to avoid potentially expensive enumeration of
2035: all matching resources.
2036:
2037: =item * B<hasResources>(map, filterFunc, recursive):
2038:
2039: Convience method for
2040:
2041: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2042:
2043: which will tell whether the map has resources matching the description
2044: in the filter function.
2045:
2046: =cut
2047:
2048: sub getResourceByUrl {
2049: my $self = shift;
2050: my $resUrl = shift;
2051:
2052: if (ref($resUrl)) { return $resUrl; }
2053:
2054: $resUrl = &Apache::lonnet::clutter($resUrl);
2055: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2056: if ($resId =~ /,/) {
2057: $resId = (split (/,/, $resId))[0];
2058: }
2059: if (!$resId) { return ''; }
2060: return $self->getById($resId);
2061: }
2062:
2063: sub retrieveResources {
2064: my $self = shift;
2065: my $map = shift;
2066: my $filterFunc = shift;
2067: if (!defined ($filterFunc)) {
2068: $filterFunc = sub {return 1;};
2069: }
2070: my $recursive = shift;
2071: if (!defined($recursive)) { $recursive = 1; }
2072: my $bailout = shift;
2073: if (!defined($bailout)) { $bailout = 0; }
2074:
2075: # Create the necessary iterator.
2076: if (!ref($map)) { # assume it's a url of a map.
2077: $map = $self->getResourceByUrl($map);
2078: }
2079:
2080: # Check the map's validity.
2081: if (!$map || !$map->is_map()) {
2082: # Oh, to throw an exception.... how I'd love that!
2083: return ();
2084: }
2085:
2086: # Get an iterator.
2087: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2088: !$recursive);
2089:
2090: my @resources = ();
2091:
2092: # Run down the iterator and collect the resources.
2093: my $depth = 1;
2094: $it->next();
2095: my $curRes = $it->next();
2096:
2097: while ($depth > 0) {
2098: if ($curRes == $it->BEGIN_MAP()) {
2099: $depth++;
2100: }
2101: if ($curRes == $it->END_MAP()) {
2102: $depth--;
2103: }
2104:
2105: if (ref($curRes)) {
2106: if (!&$filterFunc($curRes)) {
2107: next;
2108: }
2109:
2110: push @resources, $curRes;
2111:
2112: if ($bailout) {
2113: return @resources;
2114: }
2115: }
2116:
2117: $curRes = $it->next();
2118: }
2119:
2120: return @resources;
2121: }
2122:
2123: sub hasResource {
2124: my $self = shift;
2125: my $map = shift;
2126: my $filterFunc = shift;
2127: my $recursive = shift;
2128:
2129: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2130: }
2131:
2132: 1;
2133:
2134: package Apache::lonnavmaps::iterator;
2135:
2136: =pod
2137:
2138: =back
2139:
2140: =head1 Object: navmap Iterator
2141:
2142: An I<iterator> encapsulates the logic required to traverse a data
2143: structure. navmap uses an iterator to traverse the course map
2144: according to the criteria you wish to use.
2145:
2146: To obtain an iterator, call the B<getIterator>() function of a
2147: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2148: directly.) This will return a reference to the iterator:
2149:
2150: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2151:
2152: To get the next thing from the iterator, call B<next>:
2153:
2154: C<my $nextThing = $resourceIterator-E<gt>next()>
2155:
2156: getIterator behaves as follows:
2157:
2158: =over 4
2159:
2160: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2161:
2162: All parameters are optional. firstResource is a resource reference
2163: corresponding to where the iterator should start. It defaults to
2164: navmap->firstResource() for the corresponding nav map. finishResource
2165: corresponds to where you want the iterator to end, defaulting to
2166: navmap->finishResource(). filterHash is a hash used as a set
2167: containing strings representing the resource IDs, defaulting to
2168: empty. Condition is a 1 or 0 that sets what to do with the filter
2169: hash: If a 0, then only resources that exist IN the filterHash will be
2170: recursed on. If it is a 1, only resources NOT in the filterHash will
2171: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2172: false (default), the iterator will only return the first level of map
2173: that is not just a single, 'redirecting' map. If true, the iterator
2174: will return all information, starting with the top-level map,
2175: regardless of content. returnTopMap, if true (default false), will
2176: cause the iterator to return the top-level map object (resource 0.0)
2177: before anything else.
2178:
2179: Thus, by default, only top-level resources will be shown. Change the
2180: condition to a 1 without changing the hash, and all resources will be
2181: shown. Changing the condition to 1 and including some values in the
2182: hash will allow you to selectively suppress parts of the navmap, while
2183: leaving it on 0 and adding things to the hash will allow you to
2184: selectively add parts of the nav map. See the handler code for
2185: examples.
2186:
2187: The iterator will return either a reference to a resource object, or a
2188: token representing something in the map, such as the beginning of a
2189: new branch. The possible tokens are:
2190:
2191: =over 4
2192:
2193: =item * BEGIN_MAP:
2194:
2195: A new map is being recursed into. This is returned I<after> the map
2196: resource itself is returned.
2197:
2198: =item * END_MAP:
2199:
2200: The map is now done.
2201:
2202: =item * BEGIN_BRANCH:
2203:
2204: A branch is now starting. The next resource returned will be the first
2205: in that branch.
2206:
2207: =item * END_BRANCH:
2208:
2209: The branch is now done.
2210:
2211: =back
2212:
2213: The tokens are retreivable via methods on the iterator object, i.e.,
2214: $iterator->END_MAP.
2215:
2216: Maps can contain empty resources. The iterator will automatically skip
2217: over such resources, but will still treat the structure
2218: correctly. Thus, a complicated map with several branches, but
2219: consisting entirely of empty resources except for one beginning or
2220: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2221: but only one resource will be returned.
2222:
2223: =back
2224:
2225: =cut
2226:
2227: # Here are the tokens for the iterator:
2228:
2229: sub BEGIN_MAP { return 1; } # begining of a new map
2230: sub END_MAP { return 2; } # end of the map
2231: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2232: sub END_BRANCH { return 4; } # end of a branch
2233: sub FORWARD { return 1; } # go forward
2234: sub BACKWARD { return 2; }
2235:
2236: sub min {
2237: (my $a, my $b) = @_;
2238: if ($a < $b) { return $a; } else { return $b; }
2239: }
2240:
2241: sub new {
2242: # magic invocation to create a class instance
2243: my $proto = shift;
2244: my $class = ref($proto) || $proto;
2245: my $self = {};
2246:
2247: $self->{NAV_MAP} = shift;
2248: return undef unless ($self->{NAV_MAP});
2249:
2250: # Handle the parameters
2251: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2252: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2253:
2254: # If the given resources are just the ID of the resource, get the
2255: # objects
2256: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2257: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2258: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2259: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2260:
2261: $self->{FILTER} = shift;
2262:
2263: # A hash, used as a set, of resource already seen
2264: $self->{ALREADY_SEEN} = shift;
2265: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2266: $self->{CONDITION} = shift;
2267:
2268: # Do we want to automatically follow "redirection" maps?
2269: $self->{FORCE_TOP} = shift;
2270:
2271: # Do we want to return the top-level map object (resource 0.0)?
2272: $self->{RETURN_0} = shift;
2273: # have we done that yet?
2274: $self->{HAVE_RETURNED_0} = 0;
2275:
2276: # Now, we need to pre-process the map, by walking forward and backward
2277: # over the parts of the map we're going to look at.
2278:
2279: # The processing steps are exactly the same, except for a few small
2280: # changes, so I bundle those up in the following list of two elements:
2281: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2282: # first_resource).
2283: # This prevents writing nearly-identical code twice.
2284: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2285: 'FIRST_RESOURCE'],
2286: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2287: 'FINISH_RESOURCE'] );
2288:
2289: my $maxDepth = 0; # tracks max depth
2290:
2291: # If there is only one resource in this map, and it's a map, we
2292: # want to remember that, so the user can ask for the first map
2293: # that isn't just a redirector.
2294: my $resource; my $resourceCount = 0;
2295:
2296: # Documentation on this algorithm can be found in the CVS repository at
2297: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2298: # in that file.
2299: # **1**
2300:
2301: foreach my $pass (@iterations) {
2302: my $direction = $pass->[0];
2303: my $valName = $pass->[1];
2304: my $nextResourceMethod = $pass->[2];
2305: my $firstResourceName = $pass->[3];
2306:
2307: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2308: $self->{FIRST_RESOURCE},
2309: $self->{FINISH_RESOURCE},
2310: {}, undef, 0, $direction);
2311:
2312: # prime the recursion
2313: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2314: my $depth = 0;
2315: $iterator->next();
2316: my $curRes = $iterator->next();
2317: while ($depth > -1) {
2318: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2319: if ($curRes == $iterator->END_MAP()) { $depth--; }
2320:
2321: if (ref($curRes)) {
2322: # If there's only one resource, this will save it
2323: # we have to filter empty resources from consideration here,
2324: # or even "empty", redirecting maps have two (start & finish)
2325: # or three (start, finish, plus redirector)
2326: if($direction == FORWARD && $curRes->src()) {
2327: $resource = $curRes; $resourceCount++;
2328: }
2329: my $resultingVal = $curRes->{DATA}->{$valName};
2330: my $nextResources = $curRes->$nextResourceMethod();
2331: my $nextCount = scalar(@{$nextResources});
2332:
2333: if ($nextCount == 1) { # **3**
2334: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2335: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2336: }
2337:
2338: if ($nextCount > 1) { # **4**
2339: foreach my $res (@{$nextResources}) {
2340: my $current = $res->{DATA}->{$valName} || 999999999;
2341: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2342: }
2343: }
2344: }
2345:
2346: # Assign the final val (**2**)
2347: if (ref($curRes) && $direction == BACKWARD()) {
2348: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2349: $curRes->{DATA}->{BOT_UP_VAL});
2350:
2351: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2352: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2353: }
2354: } continue {
2355: $curRes = $iterator->next();
2356: }
2357: }
2358:
2359: # Check: Was this only one resource, a map?
2360: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2361: my $firstResource = $resource->map_start();
2362: my $finishResource = $resource->map_finish();
2363: return
2364: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2365: $finishResource, $self->{FILTER},
2366: $self->{ALREADY_SEEN},
2367: $self->{CONDITION}, 0);
2368:
2369: }
2370:
2371: # Set up some bookkeeping information.
2372: $self->{CURRENT_DEPTH} = 0;
2373: $self->{MAX_DEPTH} = $maxDepth;
2374: $self->{STACK} = [];
2375: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2376:
2377: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2378: push @{$self->{STACK}}, [];
2379: }
2380:
2381: # Prime the recursion w/ the first resource **5**
2382: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2383: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2384:
2385: bless ($self);
2386:
2387: return $self;
2388: }
2389:
2390: sub next {
2391: my $self = shift;
2392:
2393: # If we want to return the top-level map object, and haven't yet,
2394: # do so.
2395: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2396: $self->{HAVE_RETURNED_0} = 1;
2397: return $self->{NAV_MAP}->getById('0.0');
2398: }
2399:
2400: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2401: # grab the next from the recursive iterator
2402: my $next = $self->{RECURSIVE_ITERATOR}->next();
2403:
2404: # is it a begin or end map? If so, update the depth
2405: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2406: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2407:
2408: # Are we back at depth 0? If so, stop recursing
2409: if ($self->{RECURSIVE_DEPTH} == 0) {
2410: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2411: }
2412:
2413: return $next;
2414: }
2415:
2416: if (defined($self->{FORCE_NEXT})) {
2417: my $tmp = $self->{FORCE_NEXT};
2418: $self->{FORCE_NEXT} = undef;
2419: return $tmp;
2420: }
2421:
2422: # Have we not yet begun? If not, return BEGIN_MAP and
2423: # remember we've started.
2424: if ( !$self->{STARTED} ) {
2425: $self->{STARTED} = 1;
2426: return $self->BEGIN_MAP();
2427: }
2428:
2429: # Here's the guts of the iterator.
2430:
2431: # Find the next resource, if any.
2432: my $found = 0;
2433: my $i = $self->{MAX_DEPTH};
2434: my $newDepth;
2435: my $here;
2436: while ( $i >= 0 && !$found ) {
2437: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2438: $here = pop @{$self->{STACK}->[$i]}; # **7**
2439: $found = 1;
2440: $newDepth = $i;
2441: }
2442: $i--;
2443: }
2444:
2445: # If we still didn't find anything, we're done.
2446: if ( !$found ) {
2447: # We need to get back down to the correct branch depth
2448: if ( $self->{CURRENT_DEPTH} > 0 ) {
2449: $self->{CURRENT_DEPTH}--;
2450: return END_BRANCH();
2451: } else {
2452: return END_MAP();
2453: }
2454: }
2455:
2456: # If this is not a resource, it must be an END_BRANCH marker we want
2457: # to return directly.
2458: if (!ref($here)) { # **8**
2459: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2460: $self->{CURRENT_DEPTH}--;
2461: return $here;
2462: }
2463: }
2464:
2465: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2466: $self->{HERE} = $here;
2467:
2468: # Get to the right level
2469: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2470: push @{$self->{STACK}->[$newDepth]}, $here;
2471: $self->{CURRENT_DEPTH}--;
2472: return END_BRANCH();
2473: }
2474: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2475: push @{$self->{STACK}->[$newDepth]}, $here;
2476: $self->{CURRENT_DEPTH}++;
2477: return BEGIN_BRANCH();
2478: }
2479:
2480: # If we made it here, we have the next resource, and we're at the
2481: # right branch level. So let's examine the resource for where
2482: # we can get to from here.
2483:
2484: # So we need to look at all the resources we can get to from here,
2485: # categorize them if we haven't seen them, remember if we have a new
2486: my $nextUnfiltered = $here->getNext();
2487: my $maxDepthAdded = -1;
2488:
2489: for (@$nextUnfiltered) {
2490: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2491: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2492: push @{$self->{STACK}->[$depth]}, $_;
2493: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2494: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2495: }
2496: }
2497:
2498: # Is this the end of a branch? If so, all of the resources examined above
2499: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2500: # marker onto the stack so we don't forget.
2501: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2502: # BC branch and gets to C, it will see F as the only next resource, but it's
2503: # one level lower. Thus, this is the end of the branch, since there are no
2504: # more resources added to this level or above.
2505: # We don't do this if the examined resource is the finish resource,
2506: # because the condition given above is true, but the "END_MAP" will
2507: # take care of things and we should already be at depth 0.
2508: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2509: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2510: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2511: }
2512:
2513: # That ends the main iterator logic. Now, do we want to recurse
2514: # down this map (if this resource is a map)?
2515: if ($self->{HERE}->is_map() &&
2516: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2517: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2518: my $firstResource = $self->{HERE}->map_start();
2519: my $finishResource = $self->{HERE}->map_finish();
2520:
2521: $self->{RECURSIVE_ITERATOR} =
2522: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2523: $finishResource, $self->{FILTER},
2524: $self->{ALREADY_SEEN}, $self->{CONDITION});
2525: }
2526:
2527: # If this is a blank resource, don't actually return it.
2528: # Should you ever find you need it, make sure to add an option to the code
2529: # that you can use; other things depend on this behavior.
2530: my $browsePriv = $self->{HERE}->browsePriv();
2531: if (!$self->{HERE}->src() ||
2532: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2533: return $self->next();
2534: }
2535:
2536: return $self->{HERE};
2537:
2538: }
2539:
2540: =pod
2541:
2542: The other method available on the iterator is B<getStack>, which
2543: returns an array populated with the current 'stack' of maps, as
2544: references to the resource objects. Example: This is useful when
2545: making the navigation map, as we need to check whether we are under a
2546: page map to see if we need to link directly to the resource, or to the
2547: page. The first elements in the array will correspond to the top of
2548: the stack (most inclusive map).
2549:
2550: =cut
2551:
2552: sub getStack {
2553: my $self=shift;
2554:
2555: my @stack;
2556:
2557: $self->populateStack(\@stack);
2558:
2559: return \@stack;
2560: }
2561:
2562: # Private method: Calls the iterators recursively to populate the stack.
2563: sub populateStack {
2564: my $self=shift;
2565: my $stack = shift;
2566:
2567: push @$stack, $self->{HERE} if ($self->{HERE});
2568:
2569: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2570: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2571: }
2572: }
2573:
2574: 1;
2575:
2576: package Apache::lonnavmaps::DFSiterator;
2577:
2578: # Not documented in the perldoc: This is a simple iterator that just walks
2579: # through the nav map and presents the resources in a depth-first search
2580: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2581: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2582: # useful for pre-processing of some kind, and is in fact used by the main
2583: # iterator that way, but that's about it.
2584: # One could imagine merging this into the init routine of the main iterator,
2585: # but this might as well be left seperate, since it is possible some other
2586: # use might be found for it. - Jeremy
2587:
2588: # Unlike the main iterator, this DOES return all resources, even blank ones.
2589: # The main iterator needs them to correctly preprocess the map.
2590:
2591: sub BEGIN_MAP { return 1; } # begining of a new map
2592: sub END_MAP { return 2; } # end of the map
2593: sub FORWARD { return 1; } # go forward
2594: sub BACKWARD { return 2; }
2595:
2596: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2597: # filter hash ref (or undef), already seen hash or undef, condition
2598: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2599: sub new {
2600: # magic invocation to create a class instance
2601: my $proto = shift;
2602: my $class = ref($proto) || $proto;
2603: my $self = {};
2604:
2605: $self->{NAV_MAP} = shift;
2606: return undef unless ($self->{NAV_MAP});
2607:
2608: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2609: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2610:
2611: # If the given resources are just the ID of the resource, get the
2612: # objects
2613: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2614: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2615: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2616: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2617:
2618: $self->{FILTER} = shift;
2619:
2620: # A hash, used as a set, of resource already seen
2621: $self->{ALREADY_SEEN} = shift;
2622: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2623: $self->{CONDITION} = shift;
2624: $self->{DIRECTION} = shift || FORWARD();
2625:
2626: # Flag: Have we started yet?
2627: $self->{STARTED} = 0;
2628:
2629: # Should we continue calling the recursive iterator, if any?
2630: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2631: # The recursive iterator, if any
2632: $self->{RECURSIVE_ITERATOR} = undef;
2633: # Are we recursing on a map, or a branch?
2634: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2635: # And the count of how deep it is, so that this iterator can keep track of
2636: # when to pick back up again.
2637: $self->{RECURSIVE_DEPTH} = 0;
2638:
2639: # For keeping track of our branches, we maintain our own stack
2640: $self->{STACK} = [];
2641:
2642: # Start with the first resource
2643: if ($self->{DIRECTION} == FORWARD) {
2644: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2645: } else {
2646: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2647: }
2648:
2649: bless($self);
2650: return $self;
2651: }
2652:
2653: sub next {
2654: my $self = shift;
2655:
2656: # Are we using a recursive iterator? If so, pull from that and
2657: # watch the depth; we want to resume our level at the correct time.
2658: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2659: # grab the next from the recursive iterator
2660: my $next = $self->{RECURSIVE_ITERATOR}->next();
2661:
2662: # is it a begin or end map? Update depth if so
2663: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2664: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2665:
2666: # Are we back at depth 0? If so, stop recursing.
2667: if ($self->{RECURSIVE_DEPTH} == 0) {
2668: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2669: }
2670:
2671: return $next;
2672: }
2673:
2674: # Is there a current resource to grab? If not, then return
2675: # END_MAP, which will end the iterator.
2676: if (scalar(@{$self->{STACK}}) == 0) {
2677: return $self->END_MAP();
2678: }
2679:
2680: # Have we not yet begun? If not, return BEGIN_MAP and
2681: # remember that we've started.
2682: if ( !$self->{STARTED} ) {
2683: $self->{STARTED} = 1;
2684: return $self->BEGIN_MAP;
2685: }
2686:
2687: # Get the next resource in the branch
2688: $self->{HERE} = pop @{$self->{STACK}};
2689:
2690: # remember that we've seen this, so we don't return it again later
2691: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2692:
2693: # Get the next possible resources
2694: my $nextUnfiltered;
2695: if ($self->{DIRECTION} == FORWARD()) {
2696: $nextUnfiltered = $self->{HERE}->getNext();
2697: } else {
2698: $nextUnfiltered = $self->{HERE}->getPrevious();
2699: }
2700: my $next = [];
2701:
2702: # filter the next possibilities to remove things we've
2703: # already seen.
2704: foreach (@$nextUnfiltered) {
2705: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2706: push @$next, $_;
2707: }
2708: }
2709:
2710: while (@$next) {
2711: # copy the next possibilities over to the stack
2712: push @{$self->{STACK}}, shift @$next;
2713: }
2714:
2715: # If this is a map and we want to recurse down it... (not filtered out)
2716: if ($self->{HERE}->is_map() &&
2717: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2718: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2719: my $firstResource = $self->{HERE}->map_start();
2720: my $finishResource = $self->{HERE}->map_finish();
2721:
2722: $self->{RECURSIVE_ITERATOR} =
2723: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2724: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2725: $self->{CONDITION}, $self->{DIRECTION});
2726: }
2727:
2728: return $self->{HERE};
2729: }
2730:
2731: # Identical to the full iterator methods of the same name. Hate to copy/paste
2732: # but I also hate to "inherit" either iterator from the other.
2733:
2734: sub getStack {
2735: my $self=shift;
2736:
2737: my @stack;
2738:
2739: $self->populateStack(\@stack);
2740:
2741: return \@stack;
2742: }
2743:
2744: # Private method: Calls the iterators recursively to populate the stack.
2745: sub populateStack {
2746: my $self=shift;
2747: my $stack = shift;
2748:
2749: push @$stack, $self->{HERE} if ($self->{HERE});
2750:
2751: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2752: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2753: }
2754: }
2755:
2756: 1;
2757:
2758: package Apache::lonnavmaps::resource;
2759:
2760: use Apache::lonnet;
2761:
2762: =pod
2763:
2764: =head1 Object: resource
2765:
2766: A resource object encapsulates a resource in a resource map, allowing
2767: easy manipulation of the resource, querying the properties of the
2768: resource (including user properties), and represents a reference that
2769: can be used as the canonical representation of the resource by
2770: lonnavmap clients like renderers.
2771:
2772: A resource only makes sense in the context of a navmap, as some of the
2773: data is stored in the navmap object.
2774:
2775: You will probably never need to instantiate this object directly. Use
2776: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2777: starting resource.
2778:
2779: Resource objects respect the parameter_hiddenparts, which suppresses
2780: various parts according to the wishes of the map author. As of this
2781: writing, there is no way to override this parameter, and suppressed
2782: parts will never be returned, nor will their response types or ids be
2783: stored.
2784:
2785: =head2 Public Members
2786:
2787: resource objects have a hash called DATA ($resourceRef->{DATA}) that
2788: you can store whatever you want in. This allows you to easily do
2789: two-pass algorithms without worrying about managing your own
2790: resource->data hash.
2791:
2792: =head2 Methods
2793:
2794: =over 4
2795:
2796: =item * B<new>($navmapRef, $idString):
2797:
2798: The first arg is a reference to the parent navmap object. The second
2799: is the idString of the resource itself. Very rarely, if ever, called
2800: directly. Use the nav map->getByID() method.
2801:
2802: =back
2803:
2804: =cut
2805:
2806: sub new {
2807: # magic invocation to create a class instance
2808: my $proto = shift;
2809: my $class = ref($proto) || $proto;
2810: my $self = {};
2811:
2812: $self->{NAV_MAP} = shift;
2813: $self->{ID} = shift;
2814:
2815: # Store this new resource in the parent nav map's cache.
2816: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
2817: $self->{RESOURCE_ERROR} = 0;
2818:
2819: # A hash that can be used by two-pass algorithms to store data
2820: # about this resource in. Not used by the resource object
2821: # directly.
2822: $self->{DATA} = {};
2823:
2824: bless($self);
2825:
2826: return $self;
2827: }
2828:
2829: # private function: simplify the NAV_HASH lookups we keep doing
2830: # pass the name, and to automatically append my ID, pass a true val on the
2831: # second param
2832: sub navHash {
2833: my $self = shift;
2834: my $param = shift;
2835: my $id = shift;
2836: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
2837: }
2838:
2839: =pod
2840:
2841: B<Metadata Retreival>
2842:
2843: These are methods that help you retrieve metadata about the resource:
2844: Method names are based on the fields in the compiled course
2845: representation.
2846:
2847: =over 4
2848:
2849: =item * B<compTitle>:
2850:
2851: Returns a "composite title", that is equal to $res->title() if the
2852: resource has a title, and is otherwise the last part of the URL (e.g.,
2853: "problem.problem").
2854:
2855: =item * B<ext>:
2856:
2857: Returns true if the resource is external.
2858:
2859: =item * B<goesto>:
2860:
2861: Returns the "goesto" value from the compiled nav map. (It is likely
2862: you want to use B<getNext> instead.)
2863:
2864: =item * B<kind>:
2865:
2866: Returns the kind of the resource from the compiled nav map.
2867:
2868: =item * B<randomout>:
2869:
2870: Returns true if this resource was chosen to NOT be shown to the user
2871: by the random map selection feature. In other words, this is usually
2872: false.
2873:
2874: =item * B<randompick>:
2875:
2876: Returns true for a map if the randompick feature is being used on the
2877: map. (?)
2878:
2879: =item * B<src>:
2880:
2881: Returns the source for the resource.
2882:
2883: =item * B<symb>:
2884:
2885: Returns the symb for the resource.
2886:
2887: =item * B<title>:
2888:
2889: Returns the title of the resource.
2890:
2891: =item * B<to>:
2892:
2893: Returns the "to" value from the compiled nav map. (It is likely you
2894: want to use B<getNext> instead.)
2895:
2896: =back
2897:
2898: =cut
2899:
2900: # These info functions can be used directly, as they don't return
2901: # resource information.
2902: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
2903: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
2904: sub from { my $self=shift; return $self->navHash("from_", 1); }
2905: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2906: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
2907: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2908: sub randompick {
2909: my $self = shift;
2910: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2911: '.0.parameter_randompick'};
2912: }
2913: sub src {
2914: my $self=shift;
2915: return $self->navHash("src_", 1);
2916: }
2917: sub symb {
2918: my $self=shift;
2919: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2920: my $symbSrc = &Apache::lonnet::declutter($self->src());
2921: return &Apache::lonnet::declutter(
2922: $self->navHash('map_id_'.$first))
2923: . '___' . $second . '___' . $symbSrc;
2924: }
2925: sub title { my $self=shift; return $self->navHash("title_", 1); }
2926: sub to { my $self=shift; return $self->navHash("to_", 1); }
2927: sub compTitle {
2928: my $self = shift;
2929: my $title = $self->title();
2930: $title=~s/\&colon\;/\:/gs;
2931: if (!$title) {
2932: $title = $self->src();
2933: $title = substr($title, rindex($title, '/') + 1);
2934: }
2935: return $title;
2936: }
2937: =pod
2938:
2939: B<Predicate Testing the Resource>
2940:
2941: These methods are shortcuts to deciding if a given resource has a given property.
2942:
2943: =over 4
2944:
2945: =item * B<is_map>:
2946:
2947: Returns true if the resource is a map type.
2948:
2949: =item * B<is_problem>:
2950:
2951: Returns true if the resource is a problem type, false
2952: otherwise. (Looks at the extension on the src field; might need more
2953: to work correctly.)
2954:
2955: =item * B<is_page>:
2956:
2957: Returns true if the resource is a page.
2958:
2959: =item * B<is_sequence>:
2960:
2961: Returns true if the resource is a sequence.
2962:
2963: =back
2964:
2965: =cut
2966:
2967:
2968: sub is_html {
2969: my $self=shift;
2970: my $src = $self->src();
2971: return ($src =~ /html$/);
2972: }
2973: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2974: sub is_page {
2975: my $self=shift;
2976: my $src = $self->src();
2977: return $self->navHash("is_map_", 1) &&
2978: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
2979: }
2980: sub is_problem {
2981: my $self=shift;
2982: my $src = $self->src();
2983: return ($src =~ /problem$/);
2984: }
2985: sub is_sequence {
2986: my $self=shift;
2987: my $src = $self->src();
2988: return $self->navHash("is_map_", 1) &&
2989: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
2990: }
2991:
2992: # Private method: Shells out to the parmval in the nav map, handler parts.
2993: sub parmval {
2994: my $self = shift;
2995: my $what = shift;
2996: my $part = shift;
2997: if (!defined($part)) {
2998: $part = '0';
2999: }
3000: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3001: }
3002:
3003: =pod
3004:
3005: B<Map Methods>
3006:
3007: These methods are useful for getting information about the map
3008: properties of the resource, if the resource is a map (B<is_map>).
3009:
3010: =over 4
3011:
3012: =item * B<map_finish>:
3013:
3014: Returns a reference to a resource object corresponding to the finish
3015: resource of the map.
3016:
3017: =item * B<map_pc>:
3018:
3019: Returns the pc value of the map, which is the first number that
3020: appears in the resource ID of the resources in the map, and is the
3021: number that appears around the middle of the symbs of the resources in
3022: that map.
3023:
3024: =item * B<map_start>:
3025:
3026: Returns a reference to a resource object corresponding to the start
3027: resource of the map.
3028:
3029: =item * B<map_type>:
3030:
3031: Returns a string with the type of the map in it.
3032:
3033: =back
3034:
3035: =cut
3036:
3037: sub map_finish {
3038: my $self = shift;
3039: my $src = $self->src();
3040: $src = Apache::lonnet::clutter($src);
3041: my $res = $self->navHash("map_finish_$src", 0);
3042: $res = $self->{NAV_MAP}->getById($res);
3043: return $res;
3044: }
3045: sub map_pc {
3046: my $self = shift;
3047: my $src = $self->src();
3048: return $self->navHash("map_pc_$src", 0);
3049: }
3050: sub map_start {
3051: my $self = shift;
3052: my $src = $self->src();
3053: $src = Apache::lonnet::clutter($src);
3054: my $res = $self->navHash("map_start_$src", 0);
3055: $res = $self->{NAV_MAP}->getById($res);
3056: return $res;
3057: }
3058: sub map_type {
3059: my $self = shift;
3060: my $pc = $self->map_pc();
3061: return $self->navHash("map_type_$pc", 0);
3062: }
3063:
3064: #####
3065: # Property queries
3066: #####
3067:
3068: # These functions will be responsible for returning the CORRECT
3069: # VALUE for the parameter, no matter what. So while they may look
3070: # like direct calls to parmval, they can be more then that.
3071: # So, for instance, the duedate function should use the "duedatetype"
3072: # information, rather then the resource object user.
3073:
3074: =pod
3075:
3076: =head2 Resource Parameters
3077:
3078: In order to use the resource parameters correctly, the nav map must
3079: have been instantiated with genCourseAndUserOptions set to true, so
3080: the courseopt and useropt is read correctly. Then, you can call these
3081: functions to get the relevant parameters for the resource. Each
3082: function defaults to part "0", but can be directed to another part by
3083: passing the part as the parameter.
3084:
3085: These methods are responsible for getting the parameter correct, not
3086: merely reflecting the contents of the GDBM hashes. As we move towards
3087: dates relative to other dates, these methods should be updated to
3088: reflect that. (Then, anybody using these methods will not have to update
3089: their code.)
3090:
3091: =over 4
3092:
3093: =item * B<acc>:
3094:
3095: Get the Client IP/Name Access Control information.
3096:
3097: =item * B<answerdate>:
3098:
3099: Get the answer-reveal date for the problem.
3100:
3101: =item * B<awarded>:
3102:
3103: Gets the awarded value for the problem part. Requires genUserData set to
3104: true when the navmap object was created.
3105:
3106: =item * B<duedate>:
3107:
3108: Get the due date for the problem.
3109:
3110: =item * B<tries>:
3111:
3112: Get the number of tries the student has used on the problem.
3113:
3114: =item * B<maxtries>:
3115:
3116: Get the number of max tries allowed.
3117:
3118: =item * B<opendate>:
3119:
3120: Get the open date for the problem.
3121:
3122: =item * B<sig>:
3123:
3124: Get the significant figures setting.
3125:
3126: =item * B<tol>:
3127:
3128: Get the tolerance for the problem.
3129:
3130: =item * B<tries>:
3131:
3132: Get the number of tries the user has already used on the problem.
3133:
3134: =item * B<type>:
3135:
3136: Get the question type for the problem.
3137:
3138: =item * B<weight>:
3139:
3140: Get the weight for the problem.
3141:
3142: =back
3143:
3144: =cut
3145:
3146: sub acc {
3147: (my $self, my $part) = @_;
3148: return $self->parmval("acc", $part);
3149: }
3150: sub answerdate {
3151: (my $self, my $part) = @_;
3152: # Handle intervals
3153: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3154: return $self->duedate($part) +
3155: $self->parmval("answerdate", $part);
3156: }
3157: return $self->parmval("answerdate", $part);
3158: }
3159: sub awarded {
3160: my $self = shift; my $part = shift;
3161: if (!defined($part)) { $part = '0'; }
3162: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3163: }
3164: sub duedate {
3165: (my $self, my $part) = @_;
3166: return $self->parmval("duedate", $part);
3167: }
3168: sub maxtries {
3169: (my $self, my $part) = @_;
3170: return $self->parmval("maxtries", $part);
3171: }
3172: sub opendate {
3173: (my $self, my $part) = @_;
3174: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3175: return $self->duedate($part) -
3176: $self->parmval("opendate", $part);
3177: }
3178: return $self->parmval("opendate");
3179: }
3180: sub problemstatus {
3181: (my $self, my $part) = @_;
3182: return $self->parmval("problemstatus", $part);
3183: }
3184: sub sig {
3185: (my $self, my $part) = @_;
3186: return $self->parmval("sig", $part);
3187: }
3188: sub tol {
3189: (my $self, my $part) = @_;
3190: return $self->parmval("tol", $part);
3191: }
3192: sub tries {
3193: my $self = shift;
3194: my $tries = $self->queryRestoreHash('tries', shift);
3195: if (!defined($tries)) { return '0';}
3196: return $tries;
3197: }
3198: sub type {
3199: (my $self, my $part) = @_;
3200: return $self->parmval("type", $part);
3201: }
3202: sub weight {
3203: my $self = shift; my $part = shift;
3204: if (!defined($part)) { $part = '0'; }
3205: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3206: $self->symb(), $ENV{'user.domain'},
3207: $ENV{'user.name'},
3208: $ENV{'request.course.sec'});
3209:
3210: }
3211:
3212: # Multiple things need this
3213: sub getReturnHash {
3214: my $self = shift;
3215:
3216: if (!defined($self->{RETURN_HASH})) {
3217: my %tmpHash = &Apache::lonnet::restore($self->symb());
3218: $self->{RETURN_HASH} = \%tmpHash;
3219: }
3220: }
3221:
3222: ######
3223: # Status queries
3224: ######
3225:
3226: # These methods query the status of problems.
3227:
3228: # If we need to count parts, this function determines the number of
3229: # parts from the metadata. When called, it returns a reference to a list
3230: # of strings corresponding to the parts. (Thus, using it in a scalar context
3231: # tells you how many parts you have in the problem:
3232: # $partcount = scalar($resource->countParts());
3233: # Don't use $self->{PARTS} directly because you don't know if it's been
3234: # computed yet.
3235:
3236: =pod
3237:
3238: =head2 Resource misc
3239:
3240: Misc. functions for the resource.
3241:
3242: =over 4
3243:
3244: =item * B<hasDiscussion>:
3245:
3246: Returns a false value if there has been discussion since the user last
3247: logged in, true if there has. Always returns false if the discussion
3248: data was not extracted when the nav map was constructed.
3249:
3250: =item * B<getFeedback>:
3251:
3252: Gets the feedback for the resource and returns the raw feedback string
3253: for the resource, or the null string if there is no feedback or the
3254: email data was not extracted when the nav map was constructed. Usually
3255: used like this:
3256:
3257: for (split(/\,/, $res->getFeedback())) {
3258: my $link = &Apache::lonnet::escape($_);
3259: ...
3260:
3261: and use the link as appropriate.
3262:
3263: =cut
3264:
3265: sub hasDiscussion {
3266: my $self = shift;
3267: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3268: }
3269:
3270: sub getFeedback {
3271: my $self = shift;
3272: my $source = $self->src();
3273: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3274: return $self->{NAV_MAP}->getFeedback($source);
3275: }
3276:
3277: sub getErrors {
3278: my $self = shift;
3279: my $source = $self->src();
3280: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3281: return $self->{NAV_MAP}->getErrors($source);
3282: }
3283:
3284: =pod
3285:
3286: =item * B<parts>():
3287:
3288: Returns a list reference containing sorted strings corresponding to
3289: each part of the problem. Single part problems have only a part '0'.
3290: Multipart problems do not return their part '0', since they typically
3291: do not really matter.
3292:
3293: =item * B<countParts>():
3294:
3295: Returns the number of parts of the problem a student can answer. Thus,
3296: for single part problems, returns 1. For multipart, it returns the
3297: number of parts in the problem, not including psuedo-part 0.
3298:
3299: =item * B<multipart>():
3300:
3301: Returns true if the problem is multipart, false otherwise. Use this instead
3302: of countParts if all you want is multipart/not multipart.
3303:
3304: =item * B<responseType>($part):
3305:
3306: Returns the response type of the part, without the word "response" on the
3307: end. Example return values: 'string', 'essay', 'numeric', etc.
3308:
3309: =item * B<responseIds>($part):
3310:
3311: Retreives the response IDs for the given part as an array reference containing
3312: strings naming the response IDs. This may be empty.
3313:
3314: =back
3315:
3316: =cut
3317:
3318: sub parts {
3319: my $self = shift;
3320:
3321: if ($self->ext) { return []; }
3322:
3323: $self->extractParts();
3324: return $self->{PARTS};
3325: }
3326:
3327: sub countParts {
3328: my $self = shift;
3329:
3330: my $parts = $self->parts();
3331:
3332: # If I left this here, then it's not necessary.
3333: #my $delta = 0;
3334: #for my $part (@$parts) {
3335: # if ($part eq '0') { $delta--; }
3336: #}
3337:
3338: if ($self->{RESOURCE_ERROR}) {
3339: return 0;
3340: }
3341:
3342: return scalar(@{$parts}); # + $delta;
3343: }
3344:
3345: sub multipart {
3346: my $self = shift;
3347: return $self->countParts() > 1;
3348: }
3349:
3350: sub responseType {
3351: my $self = shift;
3352: my $part = shift;
3353:
3354: $self->extractParts();
3355: return $self->{RESPONSE_TYPE}->{$part};
3356: }
3357:
3358: sub responseIds {
3359: my $self = shift;
3360: my $part = shift;
3361:
3362: $self->extractParts();
3363: return $self->{RESPONSE_IDS}->{$part};
3364: }
3365:
3366: # Private function: Extracts the parts information, both part names and
3367: # part types, and saves it.
3368: sub extractParts {
3369: my $self = shift;
3370:
3371: return if (defined($self->{PARTS}));
3372: return if ($self->ext);
3373:
3374: $self->{PARTS} = [];
3375:
3376: my %parts;
3377:
3378: # Retrieve part count, if this is a problem
3379: if ($self->is_problem()) {
3380: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3381: if (!$metadata) {
3382: $self->{RESOURCE_ERROR} = 1;
3383: $self->{PARTS} = [];
3384: $self->{PART_TYPE} = {};
3385: return;
3386: }
3387: foreach (split(/\,/,$metadata)) {
3388: if ($_ =~ /^part_(.*)$/) {
3389: my $part = $1;
3390: # This floods the logs if it blows up
3391: if (defined($parts{$part})) {
3392: Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3393: }
3394:
3395: # check to see if part is turned off.
3396:
3397: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3398: $parts{$part} = 1;
3399: }
3400: }
3401: }
3402:
3403:
3404: my @sortedParts = sort keys %parts;
3405: $self->{PARTS} = \@sortedParts;
3406:
3407: my %responseIdHash;
3408: my %responseTypeHash;
3409:
3410:
3411: # Init the responseIdHash
3412: foreach (@{$self->{PARTS}}) {
3413: $responseIdHash{$_} = [];
3414: }
3415:
3416: # Now, the unfortunate thing about this is that parts, part name, and
3417: # response if are delimited by underscores, but both the part
3418: # name and response id can themselves have underscores in them.
3419: # So we have to use our knowlege of part names to figure out
3420: # where the part names begin and end, and even then, it is possible
3421: # to construct ambiguous situations.
3422: foreach (split /,/, $metadata) {
3423: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3424: my $responseType = $1;
3425: my $partStuff = $2;
3426: my $partIdSoFar = '';
3427: my @partChunks = split /_/, $partStuff;
3428: my $i = 0;
3429:
3430: for ($i = 0; $i < scalar(@partChunks); $i++) {
3431: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3432: $partIdSoFar .= $partChunks[$i];
3433: if ($parts{$partIdSoFar}) {
3434: my @otherChunks = @partChunks[$i+1..$#partChunks];
3435: my $responseId = join('_', @otherChunks);
3436: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3437: $responseTypeHash{$partIdSoFar} = $responseType;
3438: last;
3439: }
3440: }
3441: }
3442: }
3443:
3444: $self->{RESPONSE_IDS} = \%responseIdHash;
3445: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3446: }
3447:
3448: return;
3449: }
3450:
3451: =pod
3452:
3453: =head2 Resource Status
3454:
3455: Problem resources have status information, reflecting their various
3456: dates and completion statuses.
3457:
3458: There are two aspects to the status: the date-related information and
3459: the completion information.
3460:
3461: Idiomatic usage of these two methods would probably look something
3462: like
3463:
3464: foreach ($resource->parts()) {
3465: my $dateStatus = $resource->getDateStatus($_);
3466: my $completionStatus = $resource->getCompletionStatus($_);
3467:
3468: or
3469:
3470: my $status = $resource->status($_);
3471:
3472: ... use it here ...
3473: }
3474:
3475: Which you use depends on exactly what you are looking for. The
3476: status() function has been optimized for the nav maps display and may
3477: not precisely match what you need elsewhere.
3478:
3479: The symbolic constants shown below can be accessed through the
3480: resource object: C<$res->OPEN>.
3481:
3482: =over 4
3483:
3484: =item * B<getDateStatus>($part):
3485:
3486: ($part defaults to 0). A convenience function that returns a symbolic
3487: constant telling you about the date status of the part. The possible
3488: return values are:
3489:
3490: =back
3491:
3492: B<Date Codes>
3493:
3494: =over 4
3495:
3496: =item * B<OPEN_LATER>:
3497:
3498: The problem will be opened later.
3499:
3500: =item * B<OPEN>:
3501:
3502: Open and not yet due.
3503:
3504:
3505: =item * B<PAST_DUE_ANSWER_LATER>:
3506:
3507: The due date has passed, but the answer date has not yet arrived.
3508:
3509: =item * B<PAST_DUE_NO_ANSWER>:
3510:
3511: The due date has passed and there is no answer opening date set.
3512:
3513: =item * B<ANSWER_OPEN>:
3514:
3515: The answer date is here.
3516:
3517: =item * B<NETWORK_FAILURE>:
3518:
3519: The information is unknown due to network failure.
3520:
3521: =back
3522:
3523: =cut
3524:
3525: # Apparently the compiler optimizes these into constants automatically
3526: sub OPEN_LATER { return 0; }
3527: sub OPEN { return 1; }
3528: sub PAST_DUE_NO_ANSWER { return 2; }
3529: sub PAST_DUE_ANSWER_LATER { return 3; }
3530: sub ANSWER_OPEN { return 4; }
3531: sub NOTHING_SET { return 5; }
3532: sub NETWORK_FAILURE { return 100; }
3533:
3534: # getDateStatus gets the date status for a given problem part.
3535: # Because answer date, due date, and open date are fully independent
3536: # (i.e., it is perfectly possible to *only* have an answer date),
3537: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3538: # (past, future, none given). This function handles this with a decision
3539: # tree. Read the comments to follow the decision tree.
3540:
3541: sub getDateStatus {
3542: my $self = shift;
3543: my $part = shift;
3544: $part = "0" if (!defined($part));
3545:
3546: # Always return network failure if there was one.
3547: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3548:
3549: my $now = time();
3550:
3551: my $open = $self->opendate($part);
3552: my $due = $self->duedate($part);
3553: my $answer = $self->answerdate($part);
3554:
3555: if (!$open && !$due && !$answer) {
3556: # no data on the problem at all
3557: # should this be the same as "open later"? think multipart.
3558: return $self->NOTHING_SET;
3559: }
3560: if (!$open || $now < $open) {return $self->OPEN_LATER}
3561: if (!$due || $now < $due) {return $self->OPEN}
3562: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3563: if ($answer) { return $self->ANSWER_OPEN; }
3564: return PAST_DUE_NO_ANSWER;
3565: }
3566:
3567: =pod
3568:
3569: B<>
3570:
3571: =over 4
3572:
3573: =item * B<getCompletionStatus>($part):
3574:
3575: ($part defaults to 0.) A convenience function that returns a symbolic
3576: constant telling you about the completion status of the part, with the
3577: following possible results:
3578:
3579: =back
3580:
3581: B<Completion Codes>
3582:
3583: =over 4
3584:
3585: =item * B<NOT_ATTEMPTED>:
3586:
3587: Has not been attempted at all.
3588:
3589: =item * B<INCORRECT>:
3590:
3591: Attempted, but wrong by student.
3592:
3593: =item * B<INCORRECT_BY_OVERRIDE>:
3594:
3595: Attempted, but wrong by instructor override.
3596:
3597: =item * B<CORRECT>:
3598:
3599: Correct or correct by instructor.
3600:
3601: =item * B<CORRECT_BY_OVERRIDE>:
3602:
3603: Correct by instructor override.
3604:
3605: =item * B<EXCUSED>:
3606:
3607: Excused. Not yet implemented.
3608:
3609: =item * B<NETWORK_FAILURE>:
3610:
3611: Information not available due to network failure.
3612:
3613: =item * B<ATTEMPTED>:
3614:
3615: Attempted, and not yet graded.
3616:
3617: =back
3618:
3619: =cut
3620:
3621: sub NOT_ATTEMPTED { return 10; }
3622: sub INCORRECT { return 11; }
3623: sub INCORRECT_BY_OVERRIDE { return 12; }
3624: sub CORRECT { return 13; }
3625: sub CORRECT_BY_OVERRIDE { return 14; }
3626: sub EXCUSED { return 15; }
3627: sub ATTEMPTED { return 16; }
3628:
3629: sub getCompletionStatus {
3630: my $self = shift;
3631: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3632:
3633: my $status = $self->queryRestoreHash('solved', shift);
3634:
3635: # Left as seperate if statements in case we ever do more with this
3636: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3637: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3638: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3639: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3640: if ($status eq 'excused') {return $self->EXCUSED; }
3641: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3642: return $self->NOT_ATTEMPTED;
3643: }
3644:
3645: sub queryRestoreHash {
3646: my $self = shift;
3647: my $hashentry = shift;
3648: my $part = shift;
3649: $part = "0" if (!defined($part) || $part eq '');
3650: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3651:
3652: $self->getReturnHash();
3653:
3654: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3655: }
3656:
3657: =pod
3658:
3659: B<Composite Status>
3660:
3661: Along with directly returning the date or completion status, the
3662: resource object includes a convenience function B<status>() that will
3663: combine the two status tidbits into one composite status that can
3664: represent the status of the resource as a whole. This method represents
3665: the concept of the thing we want to display to the user on the nav maps
3666: screen, which is a combination of completion and open status. The precise logic is
3667: documented in the comments of the status method. The following results
3668: may be returned, all available as methods on the resource object
3669: ($res->NETWORK_FAILURE): In addition to the return values that match
3670: the date or completion status, this function can return "ANSWER_SUBMITTED"
3671: if that problemstatus parameter value is set to No, suppressing the
3672: incorrect/correct feedback.
3673:
3674: =over 4
3675:
3676: =item * B<NETWORK_FAILURE>:
3677:
3678: The network has failed and the information is not available.
3679:
3680: =item * B<NOTHING_SET>:
3681:
3682: No dates have been set for this problem (part) at all. (Because only
3683: certain parts of a multi-part problem may be assigned, this can not be
3684: collapsed into "open later", as we do not know a given part will EVER
3685: be opened. For single part, this is the same as "OPEN_LATER".)
3686:
3687: =item * B<CORRECT>:
3688:
3689: For any reason at all, the part is considered correct.
3690:
3691: =item * B<EXCUSED>:
3692:
3693: For any reason at all, the problem is excused.
3694:
3695: =item * B<PAST_DUE_NO_ANSWER>:
3696:
3697: The problem is past due, not considered correct, and no answer date is
3698: set.
3699:
3700: =item * B<PAST_DUE_ANSWER_LATER>:
3701:
3702: The problem is past due, not considered correct, and an answer date in
3703: the future is set.
3704:
3705: =item * B<ANSWER_OPEN>:
3706:
3707: The problem is past due, not correct, and the answer is now available.
3708:
3709: =item * B<OPEN_LATER>:
3710:
3711: The problem is not yet open.
3712:
3713: =item * B<TRIES_LEFT>:
3714:
3715: The problem is open, has been tried, is not correct, but there are
3716: tries left.
3717:
3718: =item * B<INCORRECT>:
3719:
3720: The problem is open, and all tries have been used without getting the
3721: correct answer.
3722:
3723: =item * B<OPEN>:
3724:
3725: The item is open and not yet tried.
3726:
3727: =item * B<ATTEMPTED>:
3728:
3729: The problem has been attempted.
3730:
3731: =item * B<ANSWER_SUBMITTED>:
3732:
3733: An answer has been submitted, but the student should not see it.
3734:
3735: =back
3736:
3737: =cut
3738:
3739: sub TRIES_LEFT { return 20; }
3740: sub ANSWER_SUBMITTED { return 21; }
3741:
3742: sub status {
3743: my $self = shift;
3744: my $part = shift;
3745: if (!defined($part)) { $part = "0"; }
3746: my $completionStatus = $self->getCompletionStatus($part);
3747: my $dateStatus = $self->getDateStatus($part);
3748:
3749: # What we have is a two-dimensional matrix with 4 entries on one
3750: # dimension and 5 entries on the other, which we want to colorize,
3751: # plus network failure and "no date data at all".
3752:
3753: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3754:
3755: my $suppressFeedback = lc($self->parmval("problemstatus", $part)) eq 'no';
3756:
3757: # There are a few whole rows we can dispose of:
3758: if ($completionStatus == CORRECT ||
3759: $completionStatus == CORRECT_BY_OVERRIDE ) {
3760: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
3761: }
3762:
3763: if ($completionStatus == ATTEMPTED) {
3764: return ATTEMPTED;
3765: }
3766:
3767: # If it's EXCUSED, then return that no matter what
3768: if ($completionStatus == EXCUSED) {
3769: return EXCUSED;
3770: }
3771:
3772: if ($dateStatus == NOTHING_SET) {
3773: return NOTHING_SET;
3774: }
3775:
3776: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3777: # by 4 matrix (date statuses).
3778:
3779: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
3780: $dateStatus == PAST_DUE_NO_ANSWER ) {
3781: return $dateStatus;
3782: }
3783:
3784: if ($dateStatus == ANSWER_OPEN) {
3785: return ANSWER_OPEN;
3786: }
3787:
3788: # Now: (incorrect, incorrect_override, not_attempted) x
3789: # (open_later), (open)
3790:
3791: if ($dateStatus == OPEN_LATER) {
3792: return OPEN_LATER;
3793: }
3794:
3795: # If it's WRONG...
3796: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
3797: # and there are TRIES LEFT:
3798: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
3799: return TRIES_LEFT;
3800: }
3801: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
3802: }
3803:
3804: # Otherwise, it's untried and open
3805: return OPEN;
3806: }
3807:
3808: =pod
3809:
3810: B<Completable>
3811:
3812: The completable method represents the concept of I<whether the student can
3813: currently do the problem>. If the student can do the problem, which means
3814: that it is open, there are tries left, and if the problem is manually graded
3815: or the grade is suppressed via problemstatus, the student has not tried it
3816: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
3817: either the student has tried it and there is no feedback, or that for
3818: some reason it is no longer completable (not open yet, successfully completed,
3819: out of tries, etc.). As an example, this is used as the filter for the
3820: "Uncompleted Homework" option for the nav maps.
3821:
3822: If this does not quite meet your needs, do not fiddle with it (unless you are
3823: fixing it to better match the student's conception of "completable" because
3824: it's broken somehow)... make a new method.
3825:
3826: =cut
3827:
3828: sub completable {
3829: my $self = shift;
3830: if (!$self->is_problem()) { return 0; }
3831: my $partCount = $self->countParts();
3832:
3833: foreach my $part (@{$self->parts()}) {
3834: if ($part eq '0' && $partCount != 1) { next; }
3835: my $status = $self->status($part);
3836: # "If any of the parts are open, or have tries left (implies open),
3837: # and it is not "attempted" (manually graded problem), it is
3838: # not "complete"
3839: if (!(($status == OPEN() || $status == TRIES_LEFT())
3840: && $self->getCompletionStatus($part) != ATTEMPTED()
3841: && $status != ANSWER_SUBMITTED())) {
3842: return 0;
3843: }
3844: }
3845:
3846: # If all the parts were complete, so was this problem.
3847: return 1;
3848: }
3849:
3850: =pod
3851:
3852: =head2 Resource/Nav Map Navigation
3853:
3854: =over 4
3855:
3856: =item * B<getNext>():
3857:
3858: Retreive an array of the possible next resources after this
3859: one. Always returns an array, even in the one- or zero-element case.
3860:
3861: =item * B<getPrevious>():
3862:
3863: Retreive an array of the possible previous resources from this
3864: one. Always returns an array, even in the one- or zero-element case.
3865:
3866: =cut
3867:
3868: sub getNext {
3869: my $self = shift;
3870: my @branches;
3871: my $to = $self->to();
3872: foreach my $branch ( split(/,/, $to) ) {
3873: my $choice = $self->{NAV_MAP}->getById($branch);
3874: my $next = $choice->goesto();
3875: $next = $self->{NAV_MAP}->getById($next);
3876:
3877: push @branches, $next;
3878: }
3879: return \@branches;
3880: }
3881:
3882: sub getPrevious {
3883: my $self = shift;
3884: my @branches;
3885: my $from = $self->from();
3886: foreach my $branch ( split /,/, $from) {
3887: my $choice = $self->{NAV_MAP}->getById($branch);
3888: my $prev = $choice->comesfrom();
3889: $prev = $self->{NAV_MAP}->getById($prev);
3890:
3891: push @branches, $prev;
3892: }
3893: return \@branches;
3894: }
3895:
3896: sub browsePriv {
3897: my $self = shift;
3898: if (defined($self->{BROWSE_PRIV})) {
3899: return $self->{BROWSE_PRIV};
3900: }
3901:
3902: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
3903: }
3904:
3905: =pod
3906:
3907: =back
3908:
3909: =cut
3910:
3911: 1;
3912:
3913: __END__
3914:
3915:
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