1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.239 2003/10/09 21:02:11 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 Apache::lonlocal;
50: use POSIX qw (floor strftime);
51: use Data::Dumper; # for debugging, not always used
52:
53: # symbolic constants
54: sub SYMB { return 1; }
55: sub URL { return 2; }
56: sub NOTHING { return 3; }
57:
58: # Some data
59:
60: my $resObj = "Apache::lonnavmaps::resource";
61:
62: # Keep these mappings in sync with lonquickgrades, which uses the colors
63: # instead of the icons.
64: my %statusIconMap =
65: (
66: $resObj->CLOSED => '',
67: $resObj->OPEN => 'navmap.open.gif',
68: $resObj->CORRECT => 'navmap.correct.gif',
69: $resObj->INCORRECT => 'navmap.wrong.gif',
70: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
71: $resObj->ERROR => ''
72: );
73:
74: my %iconAltTags =
75: ( 'navmap.correct.gif' => 'Correct',
76: 'navmap.wrong.gif' => 'Incorrect',
77: 'navmap.open.gif' => 'Open' );
78:
79: # Defines a status->color mapping, null string means don't color
80: my %colormap =
81: ( $resObj->NETWORK_FAILURE => '',
82: $resObj->CORRECT => '',
83: $resObj->EXCUSED => '#3333FF',
84: $resObj->PAST_DUE_ANSWER_LATER => '',
85: $resObj->PAST_DUE_NO_ANSWER => '',
86: $resObj->ANSWER_OPEN => '#006600',
87: $resObj->OPEN_LATER => '',
88: $resObj->TRIES_LEFT => '',
89: $resObj->INCORRECT => '',
90: $resObj->OPEN => '',
91: $resObj->NOTHING_SET => '',
92: $resObj->ATTEMPTED => '',
93: $resObj->ANSWER_SUBMITTED => ''
94: );
95: # And a special case in the nav map; what to do when the assignment
96: # is not yet done and due in less then 24 hours
97: my $hurryUpColor = "#FF0000";
98:
99: sub handler {
100: my $r = shift;
101: real_handler($r);
102: }
103:
104: sub real_handler {
105: my $r = shift;
106:
107: # Handle header-only request
108: if ($r->header_only) {
109: if ($ENV{'browser.mathml'}) {
110: &Apache::loncommon::content_type($r,'text/xml');
111: } else {
112: &Apache::loncommon::content_type($r,'text/html');
113: }
114: $r->send_http_header;
115: return OK;
116: }
117:
118: # Send header, don't cache this page
119: if ($ENV{'browser.mathml'}) {
120: &Apache::loncommon::content_type($r,'text/xml');
121: } else {
122: &Apache::loncommon::content_type($r,'text/html');
123: }
124: &Apache::loncommon::no_cache($r);
125: $r->send_http_header;
126:
127: # Create the nav map
128: my $navmap = Apache::lonnavmaps::navmap->new();
129:
130: if (!defined($navmap)) {
131: my $requrl = $r->uri;
132: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
133: return HTTP_NOT_ACCEPTABLE;
134: }
135:
136: $r->print("<html><head>\n");
137: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
138: # ------------------------------------------------------------ Get query string
139: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
140:
141: # ----------------------------------------------------- Force menu registration
142: my $addentries='';
143: if ($ENV{'form.register'}) {
144: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
145: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
146: $r->print(&Apache::lonmenu::registerurl(1));
147: }
148:
149: # Header
150: $r->print('</head>'.
151: &Apache::loncommon::bodytag('Navigate Course Contents','',
152: $addentries,'','',$ENV{'form.register'}));
153: $r->print('<script>window.focus();</script>');
154:
155: $r->rflush();
156:
157: # Check that it's defined
158: if (!($navmap->courseMapDefined())) {
159: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
160: '</body></html>');
161: return OK;
162: }
163:
164: # See if there's only one map in the top-level, if we don't
165: # already have a filter... if so, automatically display it
166: # (older code; should use retrieveResources)
167: if ($ENV{QUERY_STRING} !~ /filter/) {
168: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
169: my $curRes;
170: my $sequenceCount = 0;
171: my $sequenceId;
172: while ($curRes = $iterator->next()) {
173: if (ref($curRes) && $curRes->is_sequence()) {
174: $sequenceCount++;
175: $sequenceId = $curRes->map_pc();
176: }
177: }
178:
179: if ($sequenceCount == 1) {
180: # The automatic iterator creation in the render call
181: # will pick this up. We know the condition because
182: # the defined($ENV{'form.filter'}) also ensures this
183: # is a fresh call.
184: $ENV{'form.filter'} = "$sequenceId";
185: }
186: }
187:
188: my $jumpToFirstHomework = 0;
189: # Check to see if the student is jumping to next open, do-able problem
190: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
191: $jumpToFirstHomework = 1;
192: # Find the next homework problem that they can do.
193: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
194: my $curRes;
195: my $foundDoableProblem = 0;
196: my $problemRes;
197:
198: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
199: if (ref($curRes) && $curRes->is_problem()) {
200: my $status = $curRes->status();
201: if ($curRes->completable()) {
202: $problemRes = $curRes;
203: $foundDoableProblem = 1;
204:
205: # Pop open all previous maps
206: my $stack = $iterator->getStack();
207: pop @$stack; # last resource in the stack is the problem
208: # itself, which we don't need in the map stack
209: my @mapPcs = map {$_->map_pc()} @$stack;
210: $ENV{'form.filter'} = join(',', @mapPcs);
211:
212: # Mark as both "here" and "jump"
213: $ENV{'form.postsymb'} = $curRes->symb();
214: }
215: }
216: }
217:
218: # If we found no problems, print a note to that effect.
219: if (!$foundDoableProblem) {
220: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
221: }
222: } else {
223: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
224: &mt("Go To My First Homework Problem")."</a> ");
225: }
226:
227: my $suppressEmptySequences = 0;
228: my $filterFunc = undef;
229: my $resource_no_folder_link = 0;
230:
231: # Display only due homework.
232: my $showOnlyHomework = 0;
233: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
234: $showOnlyHomework = 1;
235: $suppressEmptySequences = 1;
236: $filterFunc = sub { my $res = shift;
237: return $res->completable() || $res->is_map();
238: };
239: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
240: $ENV{'form.filter'} = '';
241: $ENV{'form.condition'} = 1;
242: $resource_no_folder_link = 1;
243: } else {
244: $r->print("<a href='navmaps?showOnlyHomework'>" .
245: &mt("Show Only Uncompleted Homework")."</a> ");
246: }
247:
248: # renderer call
249: my $renderArgs = { 'cols' => [0,1,2,3],
250: 'url' => '/adm/navmaps',
251: 'navmap' => $navmap,
252: 'suppressNavmap' => 1,
253: 'suppressEmptySequences' => $suppressEmptySequences,
254: 'filterFunc' => $filterFunc,
255: 'resource_no_folder_link' => $resource_no_folder_link,
256: 'r' => $r};
257: my $render = render($renderArgs);
258: $navmap->untieHashes();
259:
260: # If no resources were printed, print a reassuring message so the
261: # user knows there was no error.
262: if ($renderArgs->{'counter'} == 0) {
263: if ($showOnlyHomework) {
264: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
265: } else { # both jumpToFirstHomework and normal use the same: course must be empty
266: $r->print("<p><font size='+1'>This course is empty.</font></p>");
267: }
268: }
269:
270: $r->print("</body></html>");
271: $r->rflush();
272:
273: return OK;
274: }
275:
276: # Convenience functions: Returns a string that adds or subtracts
277: # the second argument from the first hash, appropriate for the
278: # query string that determines which folders to recurse on
279: sub addToFilter {
280: my $hashIn = shift;
281: my $addition = shift;
282: my %hash = %$hashIn;
283: $hash{$addition} = 1;
284:
285: return join (",", keys(%hash));
286: }
287:
288: sub removeFromFilter {
289: my $hashIn = shift;
290: my $subtraction = shift;
291: my %hash = %$hashIn;
292:
293: delete $hash{$subtraction};
294: return join(",", keys(%hash));
295: }
296:
297: # Convenience function: Given a stack returned from getStack on the iterator,
298: # return the correct src() value.
299: # Later, this should add an anchor when we start putting anchors in pages.
300: sub getLinkForResource {
301: my $stack = shift;
302: my $res;
303:
304: # Check to see if there are any pages in the stack
305: foreach $res (@$stack) {
306: if (defined($res) && $res->is_page()) {
307: return $res->src();
308: }
309: }
310:
311: # Failing that, return the src of the last resource that is defined
312: # (when we first recurse on a map, it puts an undefined resource
313: # on the bottom because $self->{HERE} isn't defined yet, and we
314: # want the src for the map anyhow)
315: foreach (@$stack) {
316: if (defined($_)) { $res = $_; }
317: }
318:
319: return $res->src();
320: }
321:
322: # Convenience function: This seperates the logic of how to create
323: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
324: # etc.) into a seperate function. It takes a resource object as the
325: # first parameter, and the part number of the resource as the second.
326: # It's basically a big switch statement on the status of the resource.
327:
328: sub getDescription {
329: my $res = shift;
330: my $part = shift;
331: my $status = $res->status($part);
332:
333: if ($status == $res->NETWORK_FAILURE) {
334: return &mt("Having technical difficulties; please check status later");
335: }
336: if ($status == $res->NOTHING_SET) {
337: return &mt("Not currently assigned.");
338: }
339: if ($status == $res->OPEN_LATER) {
340: return "Open " . timeToHumanString($res->opendate($part));
341: }
342: if ($status == $res->OPEN) {
343: if ($res->duedate($part)) {
344: return &mt("Due")." " .timeToHumanString($res->duedate($part));
345: } else {
346: return &mt("Open, no due date");
347: }
348: }
349: if ($status == $res->PAST_DUE_ANSWER_LATER) {
350: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
351: }
352: if ($status == $res->PAST_DUE_NO_ANSWER) {
353: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
354: }
355: if ($status == $res->ANSWER_OPEN) {
356: return &mt("Answer available");
357: }
358: if ($status == $res->EXCUSED) {
359: return &mt("Excused by instructor");
360: }
361: if ($status == $res->ATTEMPTED) {
362: return &mt("Answer submitted, not yet graded");
363: }
364: if ($status == $res->TRIES_LEFT) {
365: my $tries = $res->tries($part);
366: my $maxtries = $res->maxtries($part);
367: my $triesString = "";
368: if ($tries && $maxtries) {
369: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
370: if ($maxtries > 1 && $maxtries - $tries == 1) {
371: $triesString = "<b>$triesString</b>";
372: }
373: }
374: if ($res->duedate()) {
375: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
376: " $triesString";
377: } else {
378: return &mt("No due date")." $triesString";
379: }
380: }
381: if ($status == $res->ANSWER_SUBMITTED) {
382: return &mt('Answer submitted');
383: }
384: }
385:
386: # Convenience function, so others can use it: Is the problem due in less then
387: # 24 hours, and still can be done?
388:
389: sub dueInLessThen24Hours {
390: my $res = shift;
391: my $part = shift;
392: my $status = $res->status($part);
393:
394: return ($status == $res->OPEN() ||
395: $status == $res->TRIES_LEFT()) &&
396: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
397: $res->duedate() > time();
398: }
399:
400: # Convenience function, so others can use it: Is there only one try remaining for the
401: # part, with more then one try to begin with, not due yet and still can be done?
402: sub lastTry {
403: my $res = shift;
404: my $part = shift;
405:
406: my $tries = $res->tries($part);
407: my $maxtries = $res->maxtries($part);
408: return $tries && $maxtries && $maxtries > 1 &&
409: $maxtries - $tries == 1 && $res->duedate() &&
410: $res->duedate() > time();
411: }
412:
413: # This puts a human-readable name on the ENV variable.
414:
415: sub advancedUser {
416: return $ENV{'request.role.adv'};
417: }
418:
419:
420: # timeToHumanString takes a time number and converts it to a
421: # human-readable representation, meant to be used in the following
422: # manner:
423: # print "Due $timestring"
424: # print "Open $timestring"
425: # print "Answer available $timestring"
426: # Very, very, very, VERY English-only... goodness help a localizer on
427: # this func...
428: sub timeToHumanString {
429: my ($time) = @_;
430: # zero, '0' and blank are bad times
431: if (!$time) {
432: return &mt('never');
433: }
434: unless (&Apache::lonlocal::current_language()=~/^en/) {
435: return &Apache::lonlocal::locallocaltime($time);
436: }
437: my $now = time();
438:
439: my @time = localtime($time);
440: my @now = localtime($now);
441:
442: # Positive = future
443: my $delta = $time - $now;
444:
445: my $minute = 60;
446: my $hour = 60 * $minute;
447: my $day = 24 * $hour;
448: my $week = 7 * $day;
449: my $inPast = 0;
450:
451: # Logic in comments:
452: # Is it now? (extremely unlikely)
453: if ( $delta == 0 ) {
454: return "this instant";
455: }
456:
457: if ($delta < 0) {
458: $inPast = 1;
459: $delta = -$delta;
460: }
461:
462: if ( $delta > 0 ) {
463:
464: my $tense = $inPast ? " ago" : "";
465: my $prefix = $inPast ? "" : "in ";
466:
467: # Less then a minute
468: if ( $delta < $minute ) {
469: if ($delta == 1) { return "${prefix}1 second$tense"; }
470: return "$prefix$delta seconds$tense";
471: }
472:
473: # Less then an hour
474: if ( $delta < $hour ) {
475: # If so, use minutes
476: my $minutes = floor($delta / 60);
477: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
478: return "$prefix$minutes minutes$tense";
479: }
480:
481: # Is it less then 24 hours away? If so,
482: # display hours + minutes
483: if ( $delta < $hour * 24) {
484: my $hours = floor($delta / $hour);
485: my $minutes = floor(($delta % $hour) / $minute);
486: my $hourString = "$hours hours";
487: my $minuteString = ", $minutes minutes";
488: if ($hours == 1) {
489: $hourString = "1 hour";
490: }
491: if ($minutes == 1) {
492: $minuteString = ", 1 minute";
493: }
494: if ($minutes == 0) {
495: $minuteString = "";
496: }
497: return "$prefix$hourString$minuteString$tense";
498: }
499:
500: # Less then 5 days away, display day of the week and
501: # HH:MM
502: if ( $delta < $day * 5 ) {
503: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
504: $timeStr =~ s/12:00 am/00:00/;
505: $timeStr =~ s/12:00 pm/noon/;
506: return ($inPast ? "last " : "next ") .
507: $timeStr;
508: }
509:
510: # Is it this year?
511: if ( $time[5] == $now[5]) {
512: # Return on Month Day, HH:MM meridian
513: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
514: $timeStr =~ s/12:00 am/00:00/;
515: $timeStr =~ s/12:00 pm/noon/;
516: return $timeStr;
517: }
518:
519: # Not this year, so show the year
520: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
521: $timeStr =~ s/12:00 am/00:00/;
522: $timeStr =~ s/12:00 pm/noon/;
523: return $timeStr;
524: }
525: }
526:
527:
528: =pod
529:
530: =head1 NAME
531:
532: Apache::lonnavmap - Subroutines to handle and render the navigation
533: maps
534:
535: =head1 SYNOPSIS
536:
537: The main handler generates the navigational listing for the course,
538: the other objects export this information in a usable fashion for
539: other modules.
540:
541: =head1 OVERVIEW
542:
543: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
544: course structure and caches it in what is often referred to as the
545: "big hash" X<big hash>. You can see it if you are logged into
546: LON-CAPA, in a course, by going to /adm/test. (You may need to
547: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
548: content of the hash will be under the heading "Big Hash".
549:
550: Big Hash contains, among other things, how resources are related
551: to each other (next/previous), what resources are maps, which
552: resources are being chosen to not show to the student (for random
553: selection), and a lot of other things that can take a lot of time
554: to compute due to the amount of data that needs to be collected and
555: processed.
556:
557: Apache::lonnavmaps provides an object model for manipulating this
558: information in a higher-level fashion then directly manipulating
559: the hash. It also provides access to several auxilary functions
560: that aren't necessarily stored in the Big Hash, but are a per-
561: resource sort of value, like whether there is any feedback on
562: a given resource.
563:
564: Apache::lonnavmaps also abstracts away branching, and someday,
565: conditions, for the times where you don't really care about those
566: things.
567:
568: Apache::lonnavmaps also provides fairly powerful routines for
569: rendering navmaps, and last but not least, provides the navmaps
570: view for when the user clicks the NAV button.
571:
572: B<Note>: Apache::lonnavmaps I<only> works for the "currently
573: logged in user"; if you want things like "due dates for another
574: student" lonnavmaps can not directly retrieve information like
575: that. You need the EXT function. This module can still help,
576: because many things, such as the course structure, are constant
577: between users, and Apache::lonnavmaps can help by providing
578: symbs for the EXT call.
579:
580: The rest of this file will cover the provided rendering routines,
581: which can often be used without fiddling with the navmap object at
582: all, then documents the Apache::lonnavmaps::navmap object, which
583: is the key to accessing the Big Hash information, covers the use
584: of the Iterator (which provides the logic for traversing the
585: somewhat-complicated Big Hash data structure), documents the
586: Apache::lonnavmaps::Resource objects that are returned by
587:
588: =head1 Subroutine: render
589:
590: The navmap renderer package provides a sophisticated rendering of the
591: standard navigation maps interface into HTML. The provided nav map
592: handler is actually just a glorified call to this.
593:
594: Because of the large number of parameters this function accepts,
595: instead of passing it arguments as is normal, pass it in an anonymous
596: hash with the desired options.
597:
598: The package provides a function called 'render', called as
599: Apache::lonnavmaps::render({}).
600:
601: =head2 Overview of Columns
602:
603: The renderer will build an HTML table for the navmap and return
604: it. The table is consists of several columns, and a row for each
605: resource (or possibly each part). You tell the renderer how many
606: columns to create and what to place in each column, optionally using
607: one or more of the prepared columns, and the renderer will assemble
608: the table.
609:
610: Any additional generally useful column types should be placed in the
611: renderer code here, so anybody can use it anywhere else. Any code
612: specific to the current application (such as the addition of <input>
613: elements in a column) should be placed in the code of the thing using
614: the renderer.
615:
616: At the core of the renderer is the array reference COLS (see Example
617: section below for how to pass this correctly). The COLS array will
618: consist of entries of one of two types of things: Either an integer
619: representing one of the pre-packaged column types, or a sub reference
620: that takes a resource reference, a part number, and a reference to the
621: argument hash passed to the renderer, and returns a string that will
622: be inserted into the HTML representation as it.
623:
624: All other parameters are ways of either changing how the columns
625: are printing, or which rows are shown.
626:
627: The pre-packaged column names are refered to by constants in the
628: Apache::lonnavmaps namespace. The following currently exist:
629:
630: =over 4
631:
632: =item * B<Apache::lonnavmaps::resource>:
633:
634: The general info about the resource: Link, icon for the type, etc. The
635: first column in the standard nav map display. This column provides the
636: indentation effect seen in the B<NAV> screen. This column also accepts
637: the following parameters in the renderer hash:
638:
639: =over 4
640:
641: =item * B<resource_nolink>: default false
642:
643: If true, the resource will not be linked. By default, all non-folder
644: resources are linked.
645:
646: =item * B<resource_part_count>: default true
647:
648: If true, the resource will show a part count B<if> the full
649: part list is not displayed. (See "condense_parts" later.) If false,
650: the resource will never show a part count.
651:
652: =item * B<resource_no_folder_link>:
653:
654: If true, the resource's folder will not be clickable to open or close
655: it. Default is false. True implies printCloseAll is false, since you
656: can't close or open folders when this is on anyhow.
657:
658: =back
659:
660: =item * B<Apache::lonnavmaps::communication_status>:
661:
662: Whether there is discussion on the resource, email for the user, or
663: (lumped in here) perl errors in the execution of the problem. This is
664: the second column in the main nav map.
665:
666: =item * B<Apache::lonnavmaps::quick_status>:
667:
668: An icon for the status of a problem, with five possible states:
669: Correct, incorrect, open, awaiting grading (for a problem where the
670: computer's grade is suppressed, or the computer can't grade, like
671: essay problem), or none (not open yet, not a problem). The
672: third column of the standard navmap.
673:
674: =item * B<Apache::lonnavmaps::long_status>:
675:
676: A text readout of the details of the current status of the problem,
677: such as "Due in 22 hours". The fourth column of the standard navmap.
678:
679: =item * B<Apache::lonnavmaps::part_status_summary>:
680:
681: A text readout summarizing the status of the problem. If it is a
682: single part problem, will display "Correct", "Incorrect",
683: "Not yet open", "Open", "Attempted", or "Error". If there are
684: multiple parts, this will output a string that in HTML will show a
685: status of how many parts are in each status, in color coding, trying
686: to match the colors of the icons within reason.
687:
688: Note this only makes sense if you are I<not> showing parts. If
689: C<showParts> is true (see below), this column will not output
690: anything.
691:
692: =back
693:
694: If you add any others please be sure to document them here.
695:
696: An example of a column renderer that will show the ID number of a
697: resource, along with the part name if any:
698:
699: sub {
700: my ($resource, $part, $params) = @_;
701: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
702: return '<td>' . $resource->{ID} . '</td>';
703: }
704:
705: Note these functions are responsible for the TD tags, which allow them
706: to override vertical and horizontal alignment, etc.
707:
708: =head2 Parameters
709:
710: Minimally, you should be
711: able to get away with just using 'cols' (to specify the columns
712: shown), 'url' (necessary for the folders to link to the current screen
713: correctly), and possibly 'queryString' if your app calls for it. In
714: that case, maintaining the state of the folders will be done
715: automatically.
716:
717: =over 4
718:
719: =item * B<iterator>: default: constructs one from %ENV
720:
721: A reference to a fresh ::iterator to use from the navmaps. The
722: rendering will reflect the options passed to the iterator, so you can
723: use that to just render a certain part of the course, if you like. If
724: one is not passed, the renderer will attempt to construct one from
725: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
726: 'iterator_map' parameter if any.
727:
728: =item * B<iterator_map>: default: not used
729:
730: If you are letting the renderer do the iterator handling, you can
731: instruct the renderer to render only a particular map by passing it
732: the source of the map you want to process, like
733: '/res/103/jerf/navmap.course.sequence'.
734:
735: =item * B<navmap>: default: constructs one from %ENV
736:
737: A reference to a navmap, used only if an iterator is not passed in. If
738: this is necessary to make an iterator but it is not passed in, a new
739: one will be constructed based on ENV info. This is useful to do basic
740: error checking before passing it off to render.
741:
742: =item * B<r>: default: must be passed in
743:
744: The standard Apache response object. This must be passed to the
745: renderer or the course hash will be locked.
746:
747: =item * B<cols>: default: empty (useless)
748:
749: An array reference
750:
751: =item * B<showParts>:default true
752:
753: A flag. If true, a line for the resource itself, and a line
754: for each part will be displayed. If not, only one line for each
755: resource will be displayed.
756:
757: =item * B<condenseParts>: default true
758:
759: A flag. If true, if all parts of the problem have the same
760: status and that status is Nothing Set, Correct, or Network Failure,
761: then only one line will be displayed for that resource anyhow. If no,
762: all parts will always be displayed. If showParts is 0, this is
763: ignored.
764:
765: =item * B<jumpCount>: default: determined from %ENV
766:
767: A string identifying the URL to place the anchor 'curloc' at.
768: It is the responsibility of the renderer user to
769: ensure that the #curloc is in the URL. By default, determined through
770: the use of the ENV{} 'jump' information, and should normally "just
771: work" correctly.
772:
773: =item * B<here>: default: empty string
774:
775: A Symb identifying where to place the 'here' marker. The empty
776: string means no marker.
777:
778: =item * B<indentString>: default: 25 pixel whitespace image
779:
780: A string identifying the indentation string to use.
781:
782: =item * B<queryString>: default: empty
783:
784: A string which will be prepended to the query string used when the
785: folders are opened or closed. You can use this to pass
786: application-specific values.
787:
788: =item * B<url>: default: none
789:
790: The url the folders will link to, which should be the current
791: page. Required if the resource info column is shown, and you
792: are allowing the user to open and close folders.
793:
794: =item * B<currentJumpIndex>: default: no jumping
795:
796: Describes the currently-open row number to cause the browser to jump
797: to, because the user just opened that folder. By default, pulled from
798: the Jump information in the ENV{'form.*'}.
799:
800: =item * B<printKey>: default: false
801:
802: If true, print the key that appears on the top of the standard
803: navmaps.
804:
805: =item * B<printCloseAll>: default: true
806:
807: If true, print the "Close all folders" or "open all folders"
808: links.
809:
810: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
811:
812: A function that takes the resource object as its only parameter and
813: returns a true or false value. If true, the resource is displayed. If
814: false, it is simply skipped in the display.
815:
816: =item * B<suppressEmptySequences>: default: false
817:
818: If you're using a filter function, and displaying sequences to orient
819: the user, then frequently some sequences will be empty. Setting this to
820: true will cause those sequences not to display, so as not to confuse the
821: user into thinking that if the sequence is there there should be things
822: under it; for example, see the "Show Uncompleted Homework" view on the
823: B<NAV> screen.
824:
825: =item * B<suppressNavmaps>: default: false
826:
827: If true, will not display Navigate Content resources.
828:
829: =back
830:
831: =head2 Additional Info
832:
833: In addition to the parameters you can pass to the renderer, which will
834: be passed through unchange to the column renderers, the renderer will
835: generate the following information which your renderer may find
836: useful:
837:
838: =over 4
839:
840: =item * B<counter>:
841:
842: Contains the number of rows printed. Useful after calling the render
843: function, as you can detect whether anything was printed at all.
844:
845: =item * B<isNewBranch>:
846:
847: Useful for renderers: If this resource is currently the first resource
848: of a new branch, this will be true. The Resource column (leftmost in the
849: navmaps screen) uses this to display the "new branch" icon
850:
851: =back
852:
853: =cut
854:
855: sub resource { return 0; }
856: sub communication_status { return 1; }
857: sub quick_status { return 2; }
858: sub long_status { return 3; }
859: sub part_status_summary { return 4; }
860:
861: sub render_resource {
862: my ($resource, $part, $params) = @_;
863:
864: my $nonLinkedText = ''; # stuff after resource title not in link
865:
866: my $link = $params->{"resourceLink"};
867: my $src = $resource->src();
868: my $it = $params->{"iterator"};
869: my $filter = $it->{FILTER};
870:
871: my $title = $resource->compTitle();
872: if ($src =~ /^\/uploaded\//) {
873: $nonLinkedText=$title;
874: $title = '';
875: }
876: my $partLabel = "";
877: my $newBranchText = "";
878:
879: # If this is a new branch, label it so
880: if ($params->{'isNewBranch'}) {
881: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
882: }
883:
884: # links to open and close the folder
885: my $linkopen = "<a href='$link'>";
886: my $linkclose = "</a>";
887:
888: # Default icon: unknown page
889: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
890:
891: if ($resource->is_problem()) {
892: if ($part eq '0' || $params->{'condensed'}) {
893: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
894: } else {
895: $icon = $params->{'indentString'};
896: }
897: } else {
898: my $curfext= (split (/\./,$resource->src))[-1];
899: my $embstyle = &Apache::loncommon::fileembstyle($curfext);
900: # The unless conditional that follows is a bit of overkill
901: if (!(!defined($embstyle) || $embstyle eq 'unk' || $embstyle eq 'hdn')) {
902: $icon = "<img src='/adm/lonIcons/$curfext.gif' alt='' border='0' />";
903: }
904: }
905:
906: # Display the correct map icon to open or shut map
907: if ($resource->is_map()) {
908: my $mapId = $resource->map_pc();
909: my $nowOpen = !defined($filter->{$mapId});
910: if ($it->{CONDITION}) {
911: $nowOpen = !$nowOpen;
912: }
913:
914: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
915:
916: if (!$params->{'resource_no_folder_link'}) {
917: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
918: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
919:
920: $linkopen = "<a href='" . $params->{'url'} . '?' .
921: $params->{'queryString'} . '&filter=';
922: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
923: addToFilter($filter, $mapId) :
924: removeFromFilter($filter, $mapId);
925: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
926: . $params->{'hereType'} . '&here=' .
927: &Apache::lonnet::escape($params->{'here'}) .
928: '&jump=' .
929: &Apache::lonnet::escape($resource->symb()) .
930: "&folderManip=1'>";
931: } else {
932: # Don't allow users to manipulate folder
933: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
934: '.nomanip.gif';
935: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
936:
937: $linkopen = "";
938: $linkclose = "";
939: }
940: }
941:
942: if ($resource->randomout()) {
943: $nonLinkedText .= ' <i>(hidden)</i> ';
944: }
945:
946: # We're done preparing and finally ready to start the rendering
947: my $result = "<td align='left' valign='center'>";
948:
949: my $indentLevel = $params->{'indentLevel'};
950: if ($newBranchText) { $indentLevel--; }
951:
952: # print indentation
953: for (my $i = 0; $i < $indentLevel; $i++) {
954: $result .= $params->{'indentString'};
955: }
956:
957: # Decide what to display
958: $result .= "$newBranchText$linkopen$icon$linkclose";
959:
960: my $curMarkerBegin = '';
961: my $curMarkerEnd = '';
962:
963: # Is this the current resource?
964: if (!$params->{'displayedHereMarker'} &&
965: $resource->symb() eq $params->{'here'} ) {
966: $curMarkerBegin = '<font color="red" size="+2">> </font>';
967: $curMarkerEnd = '<font color="red" size="+2"><</font>';
968: $params->{'displayedHereMarker'} = 1;
969: }
970:
971: if ($resource->is_problem() && $part ne '0' &&
972: !$params->{'condensed'}) {
973: $partLabel = " (Part $part)";
974: $title = "";
975: }
976:
977: if ($params->{'condensed'} && $resource->countParts() > 1) {
978: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
979: }
980:
981: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\// &&
982: !$resource->is_sequence()) {
983: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
984: } else {
985: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
986: }
987:
988: return $result;
989: }
990:
991: sub render_communication_status {
992: my ($resource, $part, $params) = @_;
993: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
994:
995: my $link = $params->{"resourceLink"};
996: my $linkopen = "<a href='$link'>";
997: my $linkclose = "</a>";
998:
999: if ($resource->hasDiscussion()) {
1000: $discussionHTML = $linkopen .
1001: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
1002: $linkclose;
1003: }
1004:
1005: if ($resource->getFeedback()) {
1006: my $feedback = $resource->getFeedback();
1007: foreach (split(/\,/, $feedback)) {
1008: if ($_) {
1009: $feedbackHTML .= ' <a href="/adm/email?display='
1010: . &Apache::lonnet::escape($_) . '">'
1011: . '<img src="/adm/lonMisc/feedback.gif" '
1012: . 'border="0" /></a>';
1013: }
1014: }
1015: }
1016:
1017: if ($resource->getErrors()) {
1018: my $errors = $resource->getErrors();
1019: foreach (split(/,/, $errors)) {
1020: if ($_) {
1021: $errorHTML .= ' <a href="/adm/email?display='
1022: . &Apache::lonnet::escape($_) . '">'
1023: . '<img src="/adm/lonMisc/bomb.gif" '
1024: . 'border="0" /></a>';
1025: }
1026: }
1027: }
1028:
1029: if ($params->{'multipart'} && $part != '0') {
1030: $discussionHTML = $feedbackHTML = $errorHTML = '';
1031: }
1032:
1033: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1034:
1035: }
1036: sub render_quick_status {
1037: my ($resource, $part, $params) = @_;
1038: my $result = "";
1039: my $firstDisplayed = !$params->{'condensed'} &&
1040: $params->{'multipart'} && $part eq "0";
1041:
1042: my $link = $params->{"resourceLink"};
1043: my $linkopen = "<a href='$link'>";
1044: my $linkclose = "</a>";
1045:
1046: if ($resource->is_problem() &&
1047: !$firstDisplayed) {
1048:
1049: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1050: my $alt = $iconAltTags{$icon};
1051: if ($icon) {
1052: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1053: } else {
1054: $result .= "<td width='30'> </td>\n";
1055: }
1056: } else { # not problem, no icon
1057: $result .= "<td width='30'> </td>\n";
1058: }
1059:
1060: return $result;
1061: }
1062: sub render_long_status {
1063: my ($resource, $part, $params) = @_;
1064: my $result = "<td align='right' valign='center'>\n";
1065: my $firstDisplayed = !$params->{'condensed'} &&
1066: $params->{'multipart'} && $part eq "0";
1067:
1068: my $color;
1069: if ($resource->is_problem()) {
1070: $color = $colormap{$resource->status};
1071:
1072: if (dueInLessThen24Hours($resource, $part) ||
1073: lastTry($resource, $part)) {
1074: $color = $hurryUpColor;
1075: }
1076: }
1077:
1078: if ($resource->kind() eq "res" &&
1079: $resource->is_problem() &&
1080: !$firstDisplayed) {
1081: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1082: $result .= getDescription($resource, $part);
1083: if ($color) {$result .= "</b></font>"; }
1084: }
1085: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1086: $result .= '(randomly select ' . $resource->randompick() .')';
1087: }
1088:
1089: # Debugging code
1090: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1091: # ' - Part: ' . $part;
1092:
1093: $result .= "</td>\n";
1094:
1095: return $result;
1096: }
1097:
1098: # Colors obtained by taking the icons, matching the colors, and
1099: # possibly reducing the Value (HSV) of the color, if it's too bright
1100: # for text, generally by one third or so.
1101: my %statusColors =
1102: (
1103: $resObj->CLOSED => '#000000',
1104: $resObj->OPEN => '#998b13',
1105: $resObj->CORRECT => '#26933f',
1106: $resObj->INCORRECT => '#c48207',
1107: $resObj->ATTEMPTED => '#a87510',
1108: $resObj->ERROR => '#000000'
1109: );
1110: my %statusStrings =
1111: (
1112: $resObj->CLOSED => 'Not yet open',
1113: $resObj->OPEN => 'Open',
1114: $resObj->CORRECT => 'Correct',
1115: $resObj->INCORRECT => 'Incorrect',
1116: $resObj->ATTEMPTED => 'Attempted',
1117: $resObj->ERROR => 'Network Error'
1118: );
1119: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1120:
1121: use Data::Dumper;
1122: sub render_parts_summary_status {
1123: my ($resource, $part, $params) = @_;
1124: if (!$resource->is_problem()) { return '<td></td>'; }
1125: if ($params->{showParts}) {
1126: return '<td></td>';
1127: }
1128:
1129: my $td = "<td align='right'>\n";
1130: my $endtd = "</td>\n";
1131:
1132: # If there is a single part, just show the simple status
1133: if ($resource->singlepart()) {
1134: my $status = $resource->simpleStatus('0');
1135: return $td . "<font color='" . $statusColors{$status} . "'>"
1136: . $statusStrings{$status} . "</font>" . $endtd;
1137: }
1138:
1139: # Now we can be sure the $part doesn't really matter.
1140: my $statusCount = $resource->simpleStatusCount();
1141: my @counts;
1142: foreach my $status(@statuses) {
1143: # decouple display order from the simpleStatusCount order
1144: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1145: if ($statusCount->[$slot]) {
1146: push @counts, "<font color='" . $statusColors{$status} .
1147: "'>" . $statusCount->[$slot] . ' '
1148: . $statusStrings{$status} . "</font>";
1149: }
1150: }
1151:
1152: return $td . $resource->countParts() . ' parts: ' . join (', ', @counts) . $endtd;
1153: }
1154:
1155: my @preparedColumns = (\&render_resource, \&render_communication_status,
1156: \&render_quick_status, \&render_long_status,
1157: \&render_parts_summary_status);
1158:
1159: sub setDefault {
1160: my ($val, $default) = @_;
1161: if (!defined($val)) { return $default; }
1162: return $val;
1163: }
1164:
1165: sub render {
1166: my $args = shift;
1167: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1168: my $result = '';
1169:
1170: # Configure the renderer.
1171: my $cols = $args->{'cols'};
1172: if (!defined($cols)) {
1173: # no columns, no nav maps.
1174: return '';
1175: }
1176: my $mustCloseNavMap = 0;
1177: my $navmap;
1178: if (defined($args->{'navmap'})) {
1179: $navmap = $args->{'navmap'};
1180: }
1181:
1182: my $r = $args->{'r'};
1183: my $queryString = $args->{'queryString'};
1184: my $jump = $args->{'jump'};
1185: my $here = $args->{'here'};
1186: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1187: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1188: # before the current resource when using #current
1189:
1190: # If we were passed 'here' information, we are not rendering
1191: # after a folder manipulation, and we were not passed an
1192: # iterator, make sure we open the folders to show the "here"
1193: # marker
1194: my $filterHash = {};
1195: # Figure out what we're not displaying
1196: foreach (split(/\,/, $ENV{"form.filter"})) {
1197: if ($_) {
1198: $filterHash->{$_} = "1";
1199: }
1200: }
1201:
1202: # Filter: Remember filter function and add our own filter: Refuse
1203: # to show hidden resources unless the user can see them.
1204: my $userCanSeeHidden = advancedUser();
1205: my $filterFunc = setDefault($args->{'filterFunc'},
1206: sub {return 1;});
1207: if (!$userCanSeeHidden) {
1208: # Without renaming the filterfunc, the server seems to go into
1209: # an infinite loop
1210: my $oldFilterFunc = $filterFunc;
1211: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1212: &$oldFilterFunc($res);};
1213: }
1214:
1215: my $condition = 0;
1216: if ($ENV{'form.condition'}) {
1217: $condition = 1;
1218: }
1219:
1220: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1221: # Step 1: Check to see if we have a navmap
1222: if (!defined($navmap)) {
1223: $navmap = Apache::lonnavmaps::navmap->new();
1224: $mustCloseNavMap = 1;
1225: }
1226:
1227: # Step two: Locate what kind of here marker is necessary
1228: # Determine where the "here" marker is and where the screen jumps to.
1229:
1230: if ($ENV{'form.postsymb'}) {
1231: $here = $jump = $ENV{'form.postsymb'};
1232: } elsif ($ENV{'form.postdata'}) {
1233: # couldn't find a symb, is there a URL?
1234: my $currenturl = $ENV{'form.postdata'};
1235: #$currenturl=~s/^http\:\/\///;
1236: #$currenturl=~s/^[^\/]+//;
1237:
1238: $here = $jump = &Apache::lonnet::symbread($currenturl);
1239: }
1240:
1241: # Step three: Ensure the folders are open
1242: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1243: my $curRes;
1244: my $found = 0;
1245:
1246: # We only need to do this if we need to open the maps to show the
1247: # current position. This will change the counter so we can't count
1248: # for the jump marker with this loop.
1249: while (($curRes = $mapIterator->next()) && !$found) {
1250: if (ref($curRes) && $curRes->symb() eq $here) {
1251: my $mapStack = $mapIterator->getStack();
1252:
1253: # Ensure the parent maps are open
1254: for my $map (@{$mapStack}) {
1255: if ($condition) {
1256: undef $filterHash->{$map->map_pc()};
1257: } else {
1258: $filterHash->{$map->map_pc()} = 1;
1259: }
1260: }
1261: $found = 1;
1262: }
1263: }
1264: }
1265:
1266: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1267: # If this is a click on a folder or something, we want to preserve the "here"
1268: # from the querystring, and get the new "jump" marker
1269: $here = $ENV{'form.here'};
1270: $jump = $ENV{'form.jump'};
1271: }
1272:
1273: my $it = $args->{'iterator'};
1274: if (!defined($it)) {
1275: # Construct a default iterator based on $ENV{'form.'} information
1276:
1277: # Step 1: Check to see if we have a navmap
1278: if (!defined($navmap)) {
1279: $navmap = Apache::lonnavmaps::navmap->new();
1280: $mustCloseNavMap = 1;
1281: }
1282:
1283: # See if we're being passed a specific map
1284: if ($args->{'iterator_map'}) {
1285: my $map = $args->{'iterator_map'};
1286: $map = $navmap->getResourceByUrl($map);
1287: my $firstResource = $map->map_start();
1288: my $finishResource = $map->map_finish();
1289:
1290: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1291: } else {
1292: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1293: }
1294: }
1295:
1296: # (re-)Locate the jump point, if any
1297: # Note this does not take filtering or hidden into account... need
1298: # to be fixed?
1299: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1300: my $curRes;
1301: my $foundJump = 0;
1302: my $counter = 0;
1303:
1304: while (($curRes = $mapIterator->next()) && !$foundJump) {
1305: if (ref($curRes)) { $counter++; }
1306:
1307: if (ref($curRes) && $jump eq $curRes->symb()) {
1308:
1309: # This is why we have to use the main iterator instead of the
1310: # potentially faster DFS: The count has to be the same, so
1311: # the order has to be the same, which DFS won't give us.
1312: $args->{'currentJumpIndex'} = $counter;
1313: $foundJump = 1;
1314: }
1315: }
1316:
1317: my $showParts = setDefault($args->{'showParts'}, 1);
1318: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1319: # keeps track of when the current resource is found,
1320: # so we can back up a few and put the anchor above the
1321: # current resource
1322: my $printKey = $args->{'printKey'};
1323: my $printCloseAll = $args->{'printCloseAll'};
1324: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1325:
1326: # Print key?
1327: if ($printKey) {
1328: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1329: my $date=localtime;
1330: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1331: if ($navmap->{LAST_CHECK}) {
1332: $result .=
1333: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1334: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1335: '</td><td align="center" valign="bottom"> '.
1336: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1337: '</td>';
1338: } else {
1339: $result .= '<td align="center" valign="bottom"> '.
1340: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1341: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1342: '</td>';
1343: }
1344:
1345: $result .= '</tr></table>';
1346: }
1347:
1348: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1349: if ($condition) {
1350: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1351: "&here=" . Apache::lonnet::escape($here) .
1352: "\">".&mt('Close All Folders')."</a>";
1353: } else {
1354: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1355: "&here=" . Apache::lonnet::escape($here) .
1356: "\">".&mt('Open All Folders')."</a>";
1357: }
1358: $result .= "<br /><br />\n";
1359: }
1360:
1361: if ($r) {
1362: $r->print($result);
1363: $r->rflush();
1364: $result = "";
1365: }
1366: # End parameter setting
1367:
1368: # Data
1369: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1370: my $res = "Apache::lonnavmaps::resource";
1371: my %condenseStatuses =
1372: ( $res->NETWORK_FAILURE => 1,
1373: $res->NOTHING_SET => 1,
1374: $res->CORRECT => 1 );
1375: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1376:
1377: # Shared variables
1378: $args->{'counter'} = 0; # counts the rows
1379: $args->{'indentLevel'} = 0;
1380: $args->{'isNewBranch'} = 0;
1381: $args->{'condensed'} = 0;
1382: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1383: $args->{'displayedHereMarker'} = 0;
1384:
1385: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1386: # since structure actually doesn't matter, except what map has what resources.
1387: if ($args->{'suppressEmptySequences'}) {
1388: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1389: $it->{FIRST_RESOURCE},
1390: $it->{FINISH_RESOURCE},
1391: {}, undef, 1);
1392: my $depth = 0;
1393: $dfsit->next();
1394: my $curRes = $dfsit->next();
1395: while ($depth > -1) {
1396: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1397: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1398:
1399: if (ref($curRes)) {
1400: # Parallel pre-processing: Do sequences have non-filtered-out children?
1401: if ($curRes->is_map()) {
1402: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1403: # Sequences themselves do not count as visible children,
1404: # unless those sequences also have visible children.
1405: # This means if a sequence appears, there's a "promise"
1406: # that there's something under it if you open it, somewhere.
1407: } else {
1408: # Not a sequence: if it's filtered, ignore it, otherwise
1409: # rise up the stack and mark the sequences as having children
1410: if (&$filterFunc($curRes)) {
1411: for my $sequence (@{$dfsit->getStack()}) {
1412: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1413: }
1414: }
1415: }
1416: }
1417: } continue {
1418: $curRes = $dfsit->next();
1419: }
1420: }
1421:
1422: my $displayedJumpMarker = 0;
1423: # Set up iteration.
1424: my $now = time();
1425: my $in24Hours = $now + 24 * 60 * 60;
1426: my $rownum = 0;
1427:
1428: # export "here" marker information
1429: $args->{'here'} = $here;
1430:
1431: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1432: while ($curRes = $it->next()) {
1433: # Maintain indentation level.
1434: if ($curRes == $it->BEGIN_MAP() ||
1435: $curRes == $it->BEGIN_BRANCH() ) {
1436: $args->{'indentLevel'}++;
1437: }
1438: if ($curRes == $it->END_MAP() ||
1439: $curRes == $it->END_BRANCH() ) {
1440: $args->{'indentLevel'}--;
1441: }
1442: # Notice new branches
1443: if ($curRes == $it->BEGIN_BRANCH()) {
1444: $args->{'isNewBranch'} = 1;
1445: }
1446:
1447: # If this isn't an actual resource, continue on
1448: if (!ref($curRes)) {
1449: next;
1450: }
1451:
1452: # If this has been filtered out, continue on
1453: if (!(&$filterFunc($curRes))) {
1454: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1455: next;
1456: }
1457:
1458: # If this is an empty sequence and we're filtering them, continue on
1459: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1460: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1461: next;
1462: }
1463:
1464: # If we're suppressing navmaps and this is a navmap, continue on
1465: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1466: next;
1467: }
1468:
1469: $args->{'counter'}++;
1470:
1471: # Does it have multiple parts?
1472: $args->{'multipart'} = 0;
1473: $args->{'condensed'} = 0;
1474: my @parts;
1475:
1476: # Decide what parts to show.
1477: if ($curRes->is_problem() && $showParts) {
1478: @parts = @{$curRes->parts()};
1479: $args->{'multipart'} = $curRes->multipart();
1480:
1481: if ($condenseParts) { # do the condensation
1482: if (!$curRes->opendate("0")) {
1483: @parts = ();
1484: $args->{'condensed'} = 1;
1485: }
1486: if (!$args->{'condensed'}) {
1487: # Decide whether to condense based on similarity
1488: my $status = $curRes->status($parts[0]);
1489: my $due = $curRes->duedate($parts[0]);
1490: my $open = $curRes->opendate($parts[0]);
1491: my $statusAllSame = 1;
1492: my $dueAllSame = 1;
1493: my $openAllSame = 1;
1494: for (my $i = 1; $i < scalar(@parts); $i++) {
1495: if ($curRes->status($parts[$i]) != $status){
1496: $statusAllSame = 0;
1497: }
1498: if ($curRes->duedate($parts[$i]) != $due ) {
1499: $dueAllSame = 0;
1500: }
1501: if ($curRes->opendate($parts[$i]) != $open) {
1502: $openAllSame = 0;
1503: }
1504: }
1505: # $*allSame is true if all the statuses were
1506: # the same. Now, if they are all the same and
1507: # match one of the statuses to condense, or they
1508: # are all open with the same due date, or they are
1509: # all OPEN_LATER with the same open date, display the
1510: # status of the first non-zero part (to get the 'correct'
1511: # status right, since 0 is never 'correct' or 'open').
1512: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1513: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1514: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1515: @parts = ($parts[0]);
1516: $args->{'condensed'} = 1;
1517: }
1518: }
1519: # Multipart problem with one part: always "condense" (happens
1520: # to match the desirable behavior)
1521: if ($curRes->countParts() == 1) {
1522: @parts = ($parts[0]);
1523: $args->{'condensed'} = 1;
1524: }
1525: }
1526: }
1527:
1528: # If the multipart problem was condensed, "forget" it was multipart
1529: if (scalar(@parts) == 1) {
1530: $args->{'multipart'} = 0;
1531: } else {
1532: # Add part 0 so we display it correctly.
1533: unshift @parts, '0';
1534: }
1535:
1536: # Now, we've decided what parts to show. Loop through them and
1537: # show them.
1538: foreach my $part (@parts) {
1539: $rownum ++;
1540: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1541:
1542: $result .= " <tr bgcolor='$backgroundColor'>\n";
1543:
1544: # Set up some data about the parts that the cols might want
1545: my $filter = $it->{FILTER};
1546: my $stack = $it->getStack();
1547: my $src = getLinkForResource($stack);
1548:
1549: my $srcHasQuestion = $src =~ /\?/;
1550: $args->{"resourceLink"} = $src.
1551: ($srcHasQuestion?'&':'?') .
1552: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1553:
1554: # Now, display each column.
1555: foreach my $col (@$cols) {
1556: my $colHTML = '';
1557: if (ref($col)) {
1558: $colHTML .= &$col($curRes, $part, $args);
1559: } else {
1560: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1561: }
1562:
1563: # If this is the first column and it's time to print
1564: # the anchor, do so
1565: if ($col == $cols->[0] &&
1566: $args->{'counter'} == $args->{'currentJumpIndex'} -
1567: $currentJumpDelta) {
1568: # Jam the anchor after the <td> tag;
1569: # necessary for valid HTML (which Mozilla requires)
1570: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1571: $displayedJumpMarker = 1;
1572: }
1573: $result .= $colHTML . "\n";
1574: }
1575: $result .= " </tr>\n";
1576: $args->{'isNewBranch'} = 0;
1577: }
1578:
1579: if ($r && $rownum % 20 == 0) {
1580: $r->print($result);
1581: $result = "";
1582: $r->rflush();
1583: }
1584: } continue {
1585: if ($r) {
1586: # If we have the connection, make sure the user is still connected
1587: my $c = $r->connection;
1588: if ($c->aborted()) {
1589: # Who cares what we do, nobody will see it anyhow.
1590: return '';
1591: }
1592: }
1593: }
1594:
1595: # Print out the part that jumps to #curloc if it exists
1596: # delay needed because the browser is processing the jump before
1597: # it finishes rendering, so it goes to the wrong place!
1598: # onload might be better, but this routine has no access to that.
1599: # On mozilla, the 0-millisecond timeout seems to prevent this;
1600: # it's quite likely this might fix other browsers, too, and
1601: # certainly won't hurt anything.
1602: if ($displayedJumpMarker) {
1603: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1604: }
1605:
1606: $result .= "</table>";
1607:
1608: if ($r) {
1609: $r->print($result);
1610: $result = "";
1611: $r->rflush();
1612: }
1613:
1614: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1615:
1616: return $result;
1617: }
1618:
1619: 1;
1620:
1621: package Apache::lonnavmaps::navmap;
1622:
1623: =pod
1624:
1625: =head1 Object: Apache::lonnavmaps::navmap
1626:
1627: =head2 Overview
1628:
1629: The navmap object's job is to provide access to the resources
1630: in the course as Apache::lonnavmaps::resource objects, and to
1631: query and manage the relationship between those resource objects.
1632:
1633: Generally, you'll use the navmap object in one of three basic ways.
1634: In order of increasing complexity and power:
1635:
1636: =over 4
1637:
1638: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1639: various ways to obtain resource objects, based on various identifiers.
1640: Use this when you want to request information about one object or
1641: a handful of resources you already know the identities of, from some
1642: other source. For more about Ids, Symbs, and MapPcs, see the
1643: Resource documentation. Note that Url should be a B<last resort>,
1644: not your first choice; it only works when there is only one
1645: instance of the resource in the course, which only applies to
1646: maps, and even that may change in the future.
1647:
1648: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1649: retrieves resources matching some criterion and returns them
1650: in a flat array, with no structure information. Use this when
1651: you are manipulating a series of resources, based on what map
1652: the are in, but do not care about branching, or exactly how
1653: the maps and resources are related. This is the most common case.
1654:
1655: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1656: the course's navmap in various ways without writing the traversal
1657: code yourself. See iterator documentation below. Use this when
1658: you need to know absolutely everything about the course, including
1659: branches and the precise relationship between maps and resources.
1660:
1661: =back
1662:
1663: =head2 Creation And Destruction
1664:
1665: To create a navmap object, use the following function:
1666:
1667: =over 4
1668:
1669: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1670:
1671: Creates a new navmap object. Returns the navmap object if this is
1672: successful, or B<undef> if not.
1673:
1674: =back
1675:
1676: When you are done with the $navmap object, you I<must> call
1677: $navmap->untieHashes(), or you'll prevent the current user from using that
1678: course until the web server is restarted. (!)
1679:
1680: =head2 Methods
1681:
1682: =over 4
1683:
1684: =item * B<getIterator>(first, finish, filter, condition):
1685:
1686: See iterator documentation below.
1687:
1688: =cut
1689:
1690: use strict;
1691: use GDBM_File;
1692:
1693: sub new {
1694: # magic invocation to create a class instance
1695: my $proto = shift;
1696: my $class = ref($proto) || $proto;
1697: my $self = {};
1698:
1699: # Resource cache stores navmap resources as we reference them. We generate
1700: # them on-demand so we don't pay for creating resources unless we use them.
1701: $self->{RESOURCE_CACHE} = {};
1702:
1703: # Network failure flag, if we accessed the course or user opt and
1704: # failed
1705: $self->{NETWORK_FAILURE} = 0;
1706:
1707: # tie the nav hash
1708:
1709: my %navmaphash;
1710: my %parmhash;
1711: my $courseFn = $ENV{"request.course.fn"};
1712: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1713: &GDBM_READER(), 0640))) {
1714: return undef;
1715: }
1716:
1717: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1718: &GDBM_READER(), 0640)))
1719: {
1720: untie %{$self->{PARM_HASH}};
1721: return undef;
1722: }
1723:
1724: $self->{NAV_HASH} = \%navmaphash;
1725: $self->{PARM_HASH} = \%parmhash;
1726: $self->{PARM_CACHE} = {};
1727:
1728: bless($self);
1729:
1730: return $self;
1731: }
1732:
1733: sub generate_course_user_opt {
1734: my $self = shift;
1735: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1736:
1737: my $uname=$ENV{'user.name'};
1738: my $udom=$ENV{'user.domain'};
1739: my $uhome=$ENV{'user.home'};
1740: my $cid=$ENV{'request.course.id'};
1741: my $chome=$ENV{'course.'.$cid.'.home'};
1742: my ($cdom,$cnum)=split(/\_/,$cid);
1743:
1744: my $userprefix=$uname.'_'.$udom.'_';
1745:
1746: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1747: unless ($uhome eq 'no_host') {
1748: # ------------------------------------------------- Get coursedata (if present)
1749: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1750: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1751: ':resourcedata',$chome);
1752: # Check for network failure
1753: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1754: $self->{NETWORK_FAILURE} = 1;
1755: } elsif ($reply!~/^error\:/) {
1756: $courserdatas{$cid}=$reply;
1757: $courserdatas{$cid.'.last_cache'}=time;
1758: }
1759: }
1760: foreach (split(/\&/,$courserdatas{$cid})) {
1761: my ($name,$value)=split(/\=/,$_);
1762: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1763: &Apache::lonnet::unescape($value);
1764: }
1765: # --------------------------------------------------- Get userdata (if present)
1766: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1767: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1768: if ($reply!~/^error\:/) {
1769: $userrdatas{$uname.'___'.$udom}=$reply;
1770: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1771: }
1772: # check to see if network failed
1773: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1774: {
1775: $self->{NETWORK_FAILURE} = 1;
1776: }
1777: }
1778: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1779: my ($name,$value)=split(/\=/,$_);
1780: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1781: &Apache::lonnet::unescape($value);
1782: }
1783: $self->{COURSE_OPT} = \%courseopt;
1784: $self->{USER_OPT} = \%useropt;
1785: }
1786:
1787: $self->{COURSE_USER_OPT_GENERATED} = 1;
1788:
1789: return;
1790: }
1791:
1792: sub generate_email_discuss_status {
1793: my $self = shift;
1794: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1795:
1796: my $cid=$ENV{'request.course.id'};
1797: my ($cdom,$cnum)=split(/\_/,$cid);
1798:
1799: my %emailstatus = &Apache::lonnet::dump('email_status');
1800: my $logoutTime = $emailstatus{'logout'};
1801: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1802: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1803: $courseLeaveTime : $logoutTime);
1804: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1805: $cdom, $cnum);
1806: my %feedback=();
1807: my %error=();
1808: my $keys = &Apache::lonnet::reply('keys:'.
1809: $ENV{'user.domain'}.':'.
1810: $ENV{'user.name'}.':nohist_email',
1811: $ENV{'user.home'});
1812:
1813: foreach my $msgid (split(/\&/, $keys)) {
1814: $msgid=&Apache::lonnet::unescape($msgid);
1815: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1816: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1817: my ($what,$url)=($1,$2);
1818: my %status=
1819: &Apache::lonnet::get('email_status',[$msgid]);
1820: if ($status{$msgid}=~/^error\:/) {
1821: $status{$msgid}='';
1822: }
1823:
1824: if (($status{$msgid} eq 'new') ||
1825: (!$status{$msgid})) {
1826: if ($what eq 'Error') {
1827: $error{$url}.=','.$msgid;
1828: } else {
1829: $feedback{$url}.=','.$msgid;
1830: }
1831: }
1832: }
1833: }
1834:
1835: $self->{FEEDBACK} = \%feedback;
1836: $self->{ERROR_MSG} = \%error; # what is this? JB
1837: $self->{DISCUSSION_TIME} = \%discussiontime;
1838: $self->{EMAIL_STATUS} = \%emailstatus;
1839:
1840: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1841: }
1842:
1843: sub get_user_data {
1844: my $self = shift;
1845: if ($self->{RETRIEVED_USER_DATA}) { return; }
1846:
1847: # Retrieve performance data on problems
1848: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1849: $ENV{'user.domain'},
1850: $ENV{'user.name'});
1851: $self->{STUDENT_DATA} = \%student_data;
1852:
1853: $self->{RETRIEVED_USER_DATA} = 1;
1854: }
1855:
1856: # Internal function: Takes a key to look up in the nav hash and implements internal
1857: # memory caching of that key.
1858: sub navhash {
1859: my $self = shift; my $key = shift;
1860: return $self->{NAV_HASH}->{$key};
1861: }
1862:
1863: =pod
1864:
1865: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1866: false otherwise. Undefined course maps indicate an error somewhere in
1867: LON-CAPA, and you will not be able to proceed with using the navmap.
1868: See the B<NAV> screen for an example of using this.
1869:
1870: =cut
1871:
1872: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1873: sub courseMapDefined {
1874: my $self = shift;
1875: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1876:
1877: my $firstres = $self->navhash("map_start_$uri");
1878: my $lastres = $self->navhash("map_finish_$uri");
1879: return $firstres && $lastres;
1880: }
1881:
1882: sub getIterator {
1883: my $self = shift;
1884: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1885: shift, undef, shift);
1886: return $iterator;
1887: }
1888:
1889: # unties the hash when done
1890: sub untieHashes {
1891: my $self = shift;
1892: untie %{$self->{NAV_HASH}};
1893: untie %{$self->{PARM_HASH}};
1894: }
1895:
1896: # Private method: Does the given resource (as a symb string) have
1897: # current discussion? Returns 0 if chat/mail data not extracted.
1898: sub hasDiscussion {
1899: my $self = shift;
1900: my $symb = shift;
1901:
1902: $self->generate_email_discuss_status();
1903:
1904: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1905:
1906: #return defined($self->{DISCUSSION_TIME}->{$symb});
1907: return $self->{DISCUSSION_TIME}->{$symb} >
1908: $self->{LAST_CHECK};
1909: }
1910:
1911: # Private method: Does the given resource (as a symb string) have
1912: # current feedback? Returns the string in the feedback hash, which
1913: # will be false if it does not exist.
1914: sub getFeedback {
1915: my $self = shift;
1916: my $symb = shift;
1917:
1918: $self->generate_email_discuss_status();
1919:
1920: if (!defined($self->{FEEDBACK})) { return ""; }
1921:
1922: return $self->{FEEDBACK}->{$symb};
1923: }
1924:
1925: # Private method: Get the errors for that resource (by source).
1926: sub getErrors {
1927: my $self = shift;
1928: my $src = shift;
1929:
1930: $self->generate_email_discuss_status();
1931:
1932: if (!defined($self->{ERROR_MSG})) { return ""; }
1933: return $self->{ERROR_MSG}->{$src};
1934: }
1935:
1936: =pod
1937:
1938: =item * B<getById>(id):
1939:
1940: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1941: object for that resource. This method, or other methods that use it
1942: (as in the resource object) is the only proper way to obtain a
1943: resource object.
1944:
1945: =item * B<getBySymb>(symb):
1946:
1947: Based on the symb of the resource, get a resource object for that
1948: resource. This is one of the proper ways to get a resource object.
1949:
1950: =item * B<getMapByMapPc>(map_pc):
1951:
1952: Based on the map_pc of the resource, get a resource object for
1953: the given map. This is one of the proper ways to get a resource object.
1954:
1955: =cut
1956:
1957: # The strategy here is to cache the resource objects, and only construct them
1958: # as we use them. The real point is to prevent reading any more from the tied
1959: # hash then we have to, which should hopefully alleviate speed problems.
1960:
1961: sub getById {
1962: my $self = shift;
1963: my $id = shift;
1964:
1965: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1966: {
1967: return $self->{RESOURCE_CACHE}->{$id};
1968: }
1969:
1970: # resource handles inserting itself into cache.
1971: # Not clear why the quotes are necessary, but as of this
1972: # writing it doesn't work without them.
1973: return "Apache::lonnavmaps::resource"->new($self, $id);
1974: }
1975:
1976: sub getBySymb {
1977: my $self = shift;
1978: my $symb = shift;
1979: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1980: my $map = $self->getResourceByUrl($mapUrl);
1981: return $self->getById($map->map_pc() . '.' . $id);
1982: }
1983:
1984: sub getByMapPc {
1985: my $self = shift;
1986: my $map_pc = shift;
1987: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1988: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1989: return $self->getById($map_id);
1990: }
1991:
1992: =pod
1993:
1994: =item * B<firstResource>():
1995:
1996: Returns a resource object reference corresponding to the first
1997: resource in the navmap.
1998:
1999: =cut
2000:
2001: sub firstResource {
2002: my $self = shift;
2003: my $firstResource = $self->navhash('map_start_' .
2004: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2005: return $self->getById($firstResource);
2006: }
2007:
2008: =pod
2009:
2010: =item * B<finishResource>():
2011:
2012: Returns a resource object reference corresponding to the last resource
2013: in the navmap.
2014:
2015: =cut
2016:
2017: sub finishResource {
2018: my $self = shift;
2019: my $firstResource = $self->navhash('map_finish_' .
2020: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2021: return $self->getById($firstResource);
2022: }
2023:
2024: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2025: # the actual lookup; parmval caches the results.
2026: sub parmval {
2027: my $self = shift;
2028: my ($what,$symb)=@_;
2029: my $hashkey = $what."|||".$symb;
2030:
2031: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2032: return $self->{PARM_CACHE}->{$hashkey};
2033: }
2034:
2035: my $result = $self->parmval_real($what, $symb);
2036: $self->{PARM_CACHE}->{$hashkey} = $result;
2037: return $result;
2038: }
2039:
2040: sub parmval_real {
2041: my $self = shift;
2042: my ($what,$symb,$recurse) = @_;
2043:
2044: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2045: $self->generate_course_user_opt();
2046:
2047: my $cid=$ENV{'request.course.id'};
2048: my $csec=$ENV{'request.course.sec'};
2049: my $uname=$ENV{'user.name'};
2050: my $udom=$ENV{'user.domain'};
2051:
2052: unless ($symb) { return ''; }
2053: my $result='';
2054:
2055: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2056:
2057: # ----------------------------------------------------- Cascading lookup scheme
2058: my $rwhat=$what;
2059: $what=~s/^parameter\_//;
2060: $what=~s/\_/\./;
2061:
2062: my $symbparm=$symb.'.'.$what;
2063: my $mapparm=$mapname.'___(all).'.$what;
2064: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2065:
2066: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2067: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2068: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2069:
2070: my $courselevel= $usercourseprefix.'.'.$what;
2071: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2072: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2073:
2074: my $useropt = $self->{USER_OPT};
2075: my $courseopt = $self->{COURSE_OPT};
2076: my $parmhash = $self->{PARM_HASH};
2077:
2078: # ---------------------------------------------------------- first, check user
2079: if ($uname and defined($useropt)) {
2080: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2081: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2082: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2083: }
2084:
2085: # ------------------------------------------------------- second, check course
2086: if ($csec and defined($courseopt)) {
2087: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2088: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2089: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2090: }
2091:
2092: if (defined($courseopt)) {
2093: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2094: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2095: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2096: }
2097:
2098: # ----------------------------------------------------- third, check map parms
2099:
2100: my $thisparm=$$parmhash{$symbparm};
2101: if (defined($thisparm)) { return $thisparm; }
2102:
2103: # ----------------------------------------------------- fourth , check default
2104:
2105: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
2106: if (defined($default)) { return $default}
2107:
2108: # --------------------------------------------------- fifth , cascade up parts
2109:
2110: my ($space,@qualifier)=split(/\./,$rwhat);
2111: my $qualifier=join('.',@qualifier);
2112: unless ($space eq '0') {
2113: my @parts=split(/_/,$space);
2114: my $id=pop(@parts);
2115: my $part=join('_',@parts);
2116: if ($part eq '') { $part='0'; }
2117: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2118: if (defined($partgeneral)) { return $partgeneral; }
2119: }
2120: if ($recurse) { return undef; }
2121: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2122: if (defined($pack_def)) { return $pack_def; }
2123: return '';
2124: }
2125:
2126: =pod
2127:
2128: =item * B<getResourceByUrl>(url):
2129:
2130: Retrieves a resource object by URL of the resource. If passed a
2131: resource object, it will simply return it, so it is safe to use this
2132: method in code like "$res = $navmap->getResourceByUrl($res)", if
2133: you're not sure if $res is already an object, or just a URL. If the
2134: resource appears multiple times in the course, only the first instance
2135: will be returned. As a result, this is probably useful only for maps.
2136:
2137: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2138:
2139: The map is a specification of a map to retreive the resources from,
2140: either as a url or as an object. The filterFunc is a reference to a
2141: function that takes a resource object as its one argument and returns
2142: true if the resource should be included, or false if it should not
2143: be. If recursive is true, the map will be recursively examined,
2144: otherwise it will not be. If bailout is true, the function will return
2145: as soon as it finds a resource, if false it will finish. By default,
2146: the map is the top-level map of the course, filterFunc is a function
2147: that always returns 1, recursive is true, bailout is false. The
2148: resources will be returned in a list containing the resource objects
2149: for the corresponding resources, with B<no structure information> in
2150: the list; regardless of branching, recursion, etc., it will be a flat
2151: list.
2152:
2153: Thus, this is suitable for cases where you don't want the structure,
2154: just a list of all resources. It is also suitable for finding out how
2155: many resources match a given description; for this use, if all you
2156: want to know is if I<any> resources match the description, the bailout
2157: parameter will allow you to avoid potentially expensive enumeration of
2158: all matching resources.
2159:
2160: =item * B<hasResources>(map, filterFunc, recursive):
2161:
2162: Convience method for
2163:
2164: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2165:
2166: which will tell whether the map has resources matching the description
2167: in the filter function.
2168:
2169: =cut
2170:
2171: sub getResourceByUrl {
2172: my $self = shift;
2173: my $resUrl = shift;
2174:
2175: if (ref($resUrl)) { return $resUrl; }
2176:
2177: $resUrl = &Apache::lonnet::clutter($resUrl);
2178: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2179: if ($resId =~ /,/) {
2180: $resId = (split (/,/, $resId))[0];
2181: }
2182: if (!$resId) { return ''; }
2183: return $self->getById($resId);
2184: }
2185:
2186: sub retrieveResources {
2187: my $self = shift;
2188: my $map = shift;
2189: my $filterFunc = shift;
2190: if (!defined ($filterFunc)) {
2191: $filterFunc = sub {return 1;};
2192: }
2193: my $recursive = shift;
2194: if (!defined($recursive)) { $recursive = 1; }
2195: my $bailout = shift;
2196: if (!defined($bailout)) { $bailout = 0; }
2197:
2198: # Create the necessary iterator.
2199: if (!ref($map)) { # assume it's a url of a map.
2200: $map = $self->getResourceByUrl($map);
2201: }
2202:
2203: # If nothing was passed, assume top-level map
2204: if (!$map) {
2205: $map = $self->getById('0.0');
2206: }
2207:
2208: # Check the map's validity.
2209: if (!$map->is_map()) {
2210: # Oh, to throw an exception.... how I'd love that!
2211: return ();
2212: }
2213:
2214: # Get an iterator.
2215: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2216: undef, $recursive);
2217:
2218: my @resources = ();
2219:
2220: # Run down the iterator and collect the resources.
2221: my $curRes;
2222:
2223: while ($curRes = $it->next()) {
2224: if (ref($curRes)) {
2225: if (!&$filterFunc($curRes)) {
2226: next;
2227: }
2228:
2229: push @resources, $curRes;
2230:
2231: if ($bailout) {
2232: return @resources;
2233: }
2234: }
2235:
2236: }
2237:
2238: return @resources;
2239: }
2240:
2241: sub hasResource {
2242: my $self = shift;
2243: my $map = shift;
2244: my $filterFunc = shift;
2245: my $recursive = shift;
2246:
2247: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2248: }
2249:
2250: 1;
2251:
2252: package Apache::lonnavmaps::iterator;
2253:
2254: =pod
2255:
2256: =back
2257:
2258: =head1 Object: navmap Iterator
2259:
2260: An I<iterator> encapsulates the logic required to traverse a data
2261: structure. navmap uses an iterator to traverse the course map
2262: according to the criteria you wish to use.
2263:
2264: To obtain an iterator, call the B<getIterator>() function of a
2265: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2266: directly.) This will return a reference to the iterator:
2267:
2268: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2269:
2270: To get the next thing from the iterator, call B<next>:
2271:
2272: C<my $nextThing = $resourceIterator-E<gt>next()>
2273:
2274: getIterator behaves as follows:
2275:
2276: =over 4
2277:
2278: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2279:
2280: All parameters are optional. firstResource is a resource reference
2281: corresponding to where the iterator should start. It defaults to
2282: navmap->firstResource() for the corresponding nav map. finishResource
2283: corresponds to where you want the iterator to end, defaulting to
2284: navmap->finishResource(). filterHash is a hash used as a set
2285: containing strings representing the resource IDs, defaulting to
2286: empty. Condition is a 1 or 0 that sets what to do with the filter
2287: hash: If a 0, then only resources that exist IN the filterHash will be
2288: recursed on. If it is a 1, only resources NOT in the filterHash will
2289: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2290: false (default), the iterator will only return the first level of map
2291: that is not just a single, 'redirecting' map. If true, the iterator
2292: will return all information, starting with the top-level map,
2293: regardless of content. returnTopMap, if true (default false), will
2294: cause the iterator to return the top-level map object (resource 0.0)
2295: before anything else.
2296:
2297: Thus, by default, only top-level resources will be shown. Change the
2298: condition to a 1 without changing the hash, and all resources will be
2299: shown. Changing the condition to 1 and including some values in the
2300: hash will allow you to selectively suppress parts of the navmap, while
2301: leaving it on 0 and adding things to the hash will allow you to
2302: selectively add parts of the nav map. See the handler code for
2303: examples.
2304:
2305: The iterator will return either a reference to a resource object, or a
2306: token representing something in the map, such as the beginning of a
2307: new branch. The possible tokens are:
2308:
2309: =over 4
2310:
2311: =item * B<END_ITERATOR>:
2312:
2313: The iterator has returned all that it's going to. Further calls to the
2314: iterator will just produce more of these. This is a "false" value, and
2315: is the only false value the iterator which will be returned, so it can
2316: be used as a loop sentinel.
2317:
2318: =item * B<BEGIN_MAP>:
2319:
2320: A new map is being recursed into. This is returned I<after> the map
2321: resource itself is returned.
2322:
2323: =item * B<END_MAP>:
2324:
2325: The map is now done.
2326:
2327: =item * B<BEGIN_BRANCH>:
2328:
2329: A branch is now starting. The next resource returned will be the first
2330: in that branch.
2331:
2332: =item * B<END_BRANCH>:
2333:
2334: The branch is now done.
2335:
2336: =back
2337:
2338: The tokens are retreivable via methods on the iterator object, i.e.,
2339: $iterator->END_MAP.
2340:
2341: Maps can contain empty resources. The iterator will automatically skip
2342: over such resources, but will still treat the structure
2343: correctly. Thus, a complicated map with several branches, but
2344: consisting entirely of empty resources except for one beginning or
2345: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2346: but only one resource will be returned.
2347:
2348: =head2 Normal Usage
2349:
2350: Normal usage of the iterator object is to do the following:
2351:
2352: my $it = $navmap->getIterator([your params here]);
2353: my $curRes;
2354: while ($curRes = $it->next()) {
2355: [your logic here]
2356: }
2357:
2358: Note that inside of the loop, it's frequently useful to check if
2359: "$curRes" is a reference or not with the reference function; only
2360: resource objects will be references, and any non-references will
2361: be the tokens described above.
2362:
2363: Also note there is some old code floating around that trys to track
2364: the depth of the iterator to see when it's done; do not copy that
2365: code. It is difficult to get right and harder to understand then
2366: this. They should be migrated to this new style.
2367:
2368: =back
2369:
2370: =cut
2371:
2372: # Here are the tokens for the iterator:
2373:
2374: sub END_ITERATOR { return 0; }
2375: sub BEGIN_MAP { return 1; } # begining of a new map
2376: sub END_MAP { return 2; } # end of the map
2377: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2378: sub END_BRANCH { return 4; } # end of a branch
2379: sub FORWARD { return 1; } # go forward
2380: sub BACKWARD { return 2; }
2381:
2382: sub min {
2383: (my $a, my $b) = @_;
2384: if ($a < $b) { return $a; } else { return $b; }
2385: }
2386:
2387: sub new {
2388: # magic invocation to create a class instance
2389: my $proto = shift;
2390: my $class = ref($proto) || $proto;
2391: my $self = {};
2392:
2393: $self->{NAV_MAP} = shift;
2394: return undef unless ($self->{NAV_MAP});
2395:
2396: # Handle the parameters
2397: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2398: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2399:
2400: # If the given resources are just the ID of the resource, get the
2401: # objects
2402: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2403: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2404: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2405: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2406:
2407: $self->{FILTER} = shift;
2408:
2409: # A hash, used as a set, of resource already seen
2410: $self->{ALREADY_SEEN} = shift;
2411: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2412: $self->{CONDITION} = shift;
2413:
2414: # Do we want to automatically follow "redirection" maps?
2415: $self->{FORCE_TOP} = shift;
2416:
2417: # Do we want to return the top-level map object (resource 0.0)?
2418: $self->{RETURN_0} = shift;
2419: # have we done that yet?
2420: $self->{HAVE_RETURNED_0} = 0;
2421:
2422: # Now, we need to pre-process the map, by walking forward and backward
2423: # over the parts of the map we're going to look at.
2424:
2425: # The processing steps are exactly the same, except for a few small
2426: # changes, so I bundle those up in the following list of two elements:
2427: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2428: # first_resource).
2429: # This prevents writing nearly-identical code twice.
2430: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2431: 'FIRST_RESOURCE'],
2432: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2433: 'FINISH_RESOURCE'] );
2434:
2435: my $maxDepth = 0; # tracks max depth
2436:
2437: # If there is only one resource in this map, and it's a map, we
2438: # want to remember that, so the user can ask for the first map
2439: # that isn't just a redirector.
2440: my $resource; my $resourceCount = 0;
2441:
2442: # Documentation on this algorithm can be found in the CVS repository at
2443: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2444: # in that file.
2445: # **1**
2446:
2447: foreach my $pass (@iterations) {
2448: my $direction = $pass->[0];
2449: my $valName = $pass->[1];
2450: my $nextResourceMethod = $pass->[2];
2451: my $firstResourceName = $pass->[3];
2452:
2453: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2454: $self->{FIRST_RESOURCE},
2455: $self->{FINISH_RESOURCE},
2456: {}, undef, 0, $direction);
2457:
2458: # prime the recursion
2459: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2460: $iterator->next();
2461: my $curRes = $iterator->next();
2462: my $depth = 1;
2463: while ($depth > 0) {
2464: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2465: if ($curRes == $iterator->END_MAP()) { $depth--; }
2466:
2467: if (ref($curRes)) {
2468: # If there's only one resource, this will save it
2469: # we have to filter empty resources from consideration here,
2470: # or even "empty", redirecting maps have two (start & finish)
2471: # or three (start, finish, plus redirector)
2472: if($direction == FORWARD && $curRes->src()) {
2473: $resource = $curRes; $resourceCount++;
2474: }
2475: my $resultingVal = $curRes->{DATA}->{$valName};
2476: my $nextResources = $curRes->$nextResourceMethod();
2477: my $nextCount = scalar(@{$nextResources});
2478:
2479: if ($nextCount == 1) { # **3**
2480: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2481: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2482: }
2483:
2484: if ($nextCount > 1) { # **4**
2485: foreach my $res (@{$nextResources}) {
2486: my $current = $res->{DATA}->{$valName} || 999999999;
2487: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2488: }
2489: }
2490: }
2491:
2492: # Assign the final val (**2**)
2493: if (ref($curRes) && $direction == BACKWARD()) {
2494: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2495: $curRes->{DATA}->{BOT_UP_VAL});
2496:
2497: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2498: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2499: }
2500:
2501: $curRes = $iterator->next();
2502: }
2503: }
2504:
2505: # Check: Was this only one resource, a map?
2506: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2507: my $firstResource = $resource->map_start();
2508: my $finishResource = $resource->map_finish();
2509: return
2510: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2511: $finishResource, $self->{FILTER},
2512: $self->{ALREADY_SEEN},
2513: $self->{CONDITION}, 0);
2514:
2515: }
2516:
2517: # Set up some bookkeeping information.
2518: $self->{CURRENT_DEPTH} = 0;
2519: $self->{MAX_DEPTH} = $maxDepth;
2520: $self->{STACK} = [];
2521: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2522: $self->{FINISHED} = 0; # When true, the iterator has finished
2523:
2524: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2525: push @{$self->{STACK}}, [];
2526: }
2527:
2528: # Prime the recursion w/ the first resource **5**
2529: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2530: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2531:
2532: bless ($self);
2533:
2534: return $self;
2535: }
2536:
2537: sub next {
2538: my $self = shift;
2539:
2540: if ($self->{FINISHED}) {
2541: return END_ITERATOR();
2542: }
2543:
2544: # If we want to return the top-level map object, and haven't yet,
2545: # do so.
2546: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2547: $self->{HAVE_RETURNED_0} = 1;
2548: return $self->{NAV_MAP}->getById('0.0');
2549: }
2550:
2551: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2552: # grab the next from the recursive iterator
2553: my $next = $self->{RECURSIVE_ITERATOR}->next();
2554:
2555: # is it a begin or end map? If so, update the depth
2556: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2557: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2558:
2559: # Are we back at depth 0? If so, stop recursing
2560: if ($self->{RECURSIVE_DEPTH} == 0) {
2561: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2562: }
2563:
2564: return $next;
2565: }
2566:
2567: if (defined($self->{FORCE_NEXT})) {
2568: my $tmp = $self->{FORCE_NEXT};
2569: $self->{FORCE_NEXT} = undef;
2570: return $tmp;
2571: }
2572:
2573: # Have we not yet begun? If not, return BEGIN_MAP and
2574: # remember we've started.
2575: if ( !$self->{STARTED} ) {
2576: $self->{STARTED} = 1;
2577: return $self->BEGIN_MAP();
2578: }
2579:
2580: # Here's the guts of the iterator.
2581:
2582: # Find the next resource, if any.
2583: my $found = 0;
2584: my $i = $self->{MAX_DEPTH};
2585: my $newDepth;
2586: my $here;
2587: while ( $i >= 0 && !$found ) {
2588: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2589: $here = pop @{$self->{STACK}->[$i]}; # **7**
2590: $found = 1;
2591: $newDepth = $i;
2592: }
2593: $i--;
2594: }
2595:
2596: # If we still didn't find anything, we're done.
2597: if ( !$found ) {
2598: # We need to get back down to the correct branch depth
2599: if ( $self->{CURRENT_DEPTH} > 0 ) {
2600: $self->{CURRENT_DEPTH}--;
2601: return END_BRANCH();
2602: } else {
2603: $self->{FINISHED} = 1;
2604: return END_MAP();
2605: }
2606: }
2607:
2608: # If this is not a resource, it must be an END_BRANCH marker we want
2609: # to return directly.
2610: if (!ref($here)) { # **8**
2611: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2612: $self->{CURRENT_DEPTH}--;
2613: return $here;
2614: }
2615: }
2616:
2617: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2618: $self->{HERE} = $here;
2619:
2620: # Get to the right level
2621: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2622: push @{$self->{STACK}->[$newDepth]}, $here;
2623: $self->{CURRENT_DEPTH}--;
2624: return END_BRANCH();
2625: }
2626: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2627: push @{$self->{STACK}->[$newDepth]}, $here;
2628: $self->{CURRENT_DEPTH}++;
2629: return BEGIN_BRANCH();
2630: }
2631:
2632: # If we made it here, we have the next resource, and we're at the
2633: # right branch level. So let's examine the resource for where
2634: # we can get to from here.
2635:
2636: # So we need to look at all the resources we can get to from here,
2637: # categorize them if we haven't seen them, remember if we have a new
2638: my $nextUnfiltered = $here->getNext();
2639: my $maxDepthAdded = -1;
2640:
2641: for (@$nextUnfiltered) {
2642: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2643: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2644: push @{$self->{STACK}->[$depth]}, $_;
2645: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2646: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2647: }
2648: }
2649:
2650: # Is this the end of a branch? If so, all of the resources examined above
2651: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2652: # marker onto the stack so we don't forget.
2653: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2654: # BC branch and gets to C, it will see F as the only next resource, but it's
2655: # one level lower. Thus, this is the end of the branch, since there are no
2656: # more resources added to this level or above.
2657: # We don't do this if the examined resource is the finish resource,
2658: # because the condition given above is true, but the "END_MAP" will
2659: # take care of things and we should already be at depth 0.
2660: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2661: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2662: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2663: }
2664:
2665: # That ends the main iterator logic. Now, do we want to recurse
2666: # down this map (if this resource is a map)?
2667: if ($self->{HERE}->is_map() &&
2668: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2669: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2670: my $firstResource = $self->{HERE}->map_start();
2671: my $finishResource = $self->{HERE}->map_finish();
2672:
2673: $self->{RECURSIVE_ITERATOR} =
2674: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2675: $finishResource, $self->{FILTER},
2676: $self->{ALREADY_SEEN}, $self->{CONDITION});
2677: }
2678:
2679: # If this is a blank resource, don't actually return it.
2680: # Should you ever find you need it, make sure to add an option to the code
2681: # that you can use; other things depend on this behavior.
2682: my $browsePriv = $self->{HERE}->browsePriv();
2683: if (!$self->{HERE}->src() ||
2684: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2685: return $self->next();
2686: }
2687:
2688: return $self->{HERE};
2689:
2690: }
2691:
2692: =pod
2693:
2694: The other method available on the iterator is B<getStack>, which
2695: returns an array populated with the current 'stack' of maps, as
2696: references to the resource objects. Example: This is useful when
2697: making the navigation map, as we need to check whether we are under a
2698: page map to see if we need to link directly to the resource, or to the
2699: page. The first elements in the array will correspond to the top of
2700: the stack (most inclusive map).
2701:
2702: =cut
2703:
2704: sub getStack {
2705: my $self=shift;
2706:
2707: my @stack;
2708:
2709: $self->populateStack(\@stack);
2710:
2711: return \@stack;
2712: }
2713:
2714: # Private method: Calls the iterators recursively to populate the stack.
2715: sub populateStack {
2716: my $self=shift;
2717: my $stack = shift;
2718:
2719: push @$stack, $self->{HERE} if ($self->{HERE});
2720:
2721: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2722: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2723: }
2724: }
2725:
2726: 1;
2727:
2728: package Apache::lonnavmaps::DFSiterator;
2729:
2730: # Not documented in the perldoc: This is a simple iterator that just walks
2731: # through the nav map and presents the resources in a depth-first search
2732: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2733: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2734: # useful for pre-processing of some kind, and is in fact used by the main
2735: # iterator that way, but that's about it.
2736: # One could imagine merging this into the init routine of the main iterator,
2737: # but this might as well be left seperate, since it is possible some other
2738: # use might be found for it. - Jeremy
2739:
2740: # Unlike the main iterator, this DOES return all resources, even blank ones.
2741: # The main iterator needs them to correctly preprocess the map.
2742:
2743: sub BEGIN_MAP { return 1; } # begining of a new map
2744: sub END_MAP { return 2; } # end of the map
2745: sub FORWARD { return 1; } # go forward
2746: sub BACKWARD { return 2; }
2747:
2748: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2749: # filter hash ref (or undef), already seen hash or undef, condition
2750: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2751: sub new {
2752: # magic invocation to create a class instance
2753: my $proto = shift;
2754: my $class = ref($proto) || $proto;
2755: my $self = {};
2756:
2757: $self->{NAV_MAP} = shift;
2758: return undef unless ($self->{NAV_MAP});
2759:
2760: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2761: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2762:
2763: # If the given resources are just the ID of the resource, get the
2764: # objects
2765: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2766: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2767: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2768: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2769:
2770: $self->{FILTER} = shift;
2771:
2772: # A hash, used as a set, of resource already seen
2773: $self->{ALREADY_SEEN} = shift;
2774: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2775: $self->{CONDITION} = shift;
2776: $self->{DIRECTION} = shift || FORWARD();
2777:
2778: # Flag: Have we started yet?
2779: $self->{STARTED} = 0;
2780:
2781: # Should we continue calling the recursive iterator, if any?
2782: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2783: # The recursive iterator, if any
2784: $self->{RECURSIVE_ITERATOR} = undef;
2785: # Are we recursing on a map, or a branch?
2786: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2787: # And the count of how deep it is, so that this iterator can keep track of
2788: # when to pick back up again.
2789: $self->{RECURSIVE_DEPTH} = 0;
2790:
2791: # For keeping track of our branches, we maintain our own stack
2792: $self->{STACK} = [];
2793:
2794: # Start with the first resource
2795: if ($self->{DIRECTION} == FORWARD) {
2796: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2797: } else {
2798: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2799: }
2800:
2801: bless($self);
2802: return $self;
2803: }
2804:
2805: sub next {
2806: my $self = shift;
2807:
2808: # Are we using a recursive iterator? If so, pull from that and
2809: # watch the depth; we want to resume our level at the correct time.
2810: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2811: # grab the next from the recursive iterator
2812: my $next = $self->{RECURSIVE_ITERATOR}->next();
2813:
2814: # is it a begin or end map? Update depth if so
2815: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2816: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2817:
2818: # Are we back at depth 0? If so, stop recursing.
2819: if ($self->{RECURSIVE_DEPTH} == 0) {
2820: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2821: }
2822:
2823: return $next;
2824: }
2825:
2826: # Is there a current resource to grab? If not, then return
2827: # END_MAP, which will end the iterator.
2828: if (scalar(@{$self->{STACK}}) == 0) {
2829: return $self->END_MAP();
2830: }
2831:
2832: # Have we not yet begun? If not, return BEGIN_MAP and
2833: # remember that we've started.
2834: if ( !$self->{STARTED} ) {
2835: $self->{STARTED} = 1;
2836: return $self->BEGIN_MAP;
2837: }
2838:
2839: # Get the next resource in the branch
2840: $self->{HERE} = pop @{$self->{STACK}};
2841:
2842: # remember that we've seen this, so we don't return it again later
2843: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2844:
2845: # Get the next possible resources
2846: my $nextUnfiltered;
2847: if ($self->{DIRECTION} == FORWARD()) {
2848: $nextUnfiltered = $self->{HERE}->getNext();
2849: } else {
2850: $nextUnfiltered = $self->{HERE}->getPrevious();
2851: }
2852: my $next = [];
2853:
2854: # filter the next possibilities to remove things we've
2855: # already seen.
2856: foreach (@$nextUnfiltered) {
2857: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2858: push @$next, $_;
2859: }
2860: }
2861:
2862: while (@$next) {
2863: # copy the next possibilities over to the stack
2864: push @{$self->{STACK}}, shift @$next;
2865: }
2866:
2867: # If this is a map and we want to recurse down it... (not filtered out)
2868: if ($self->{HERE}->is_map() &&
2869: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2870: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2871: my $firstResource = $self->{HERE}->map_start();
2872: my $finishResource = $self->{HERE}->map_finish();
2873:
2874: $self->{RECURSIVE_ITERATOR} =
2875: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2876: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2877: $self->{CONDITION}, $self->{DIRECTION});
2878: }
2879:
2880: return $self->{HERE};
2881: }
2882:
2883: # Identical to the full iterator methods of the same name. Hate to copy/paste
2884: # but I also hate to "inherit" either iterator from the other.
2885:
2886: sub getStack {
2887: my $self=shift;
2888:
2889: my @stack;
2890:
2891: $self->populateStack(\@stack);
2892:
2893: return \@stack;
2894: }
2895:
2896: # Private method: Calls the iterators recursively to populate the stack.
2897: sub populateStack {
2898: my $self=shift;
2899: my $stack = shift;
2900:
2901: push @$stack, $self->{HERE} if ($self->{HERE});
2902:
2903: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2904: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2905: }
2906: }
2907:
2908: 1;
2909:
2910: package Apache::lonnavmaps::resource;
2911:
2912: use Apache::lonnet;
2913:
2914: =pod
2915:
2916: =head1 Object: resource
2917:
2918: X<resource, navmap object>
2919: A resource object encapsulates a resource in a resource map, allowing
2920: easy manipulation of the resource, querying the properties of the
2921: resource (including user properties), and represents a reference that
2922: can be used as the canonical representation of the resource by
2923: lonnavmap clients like renderers.
2924:
2925: A resource only makes sense in the context of a navmap, as some of the
2926: data is stored in the navmap object.
2927:
2928: You will probably never need to instantiate this object directly. Use
2929: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2930: starting resource.
2931:
2932: Resource objects respect the parameter_hiddenparts, which suppresses
2933: various parts according to the wishes of the map author. As of this
2934: writing, there is no way to override this parameter, and suppressed
2935: parts will never be returned, nor will their response types or ids be
2936: stored.
2937:
2938: =head2 Overview
2939:
2940: A B<Resource> is the most granular type of object in LON-CAPA that can
2941: be included in a course. It can either be a particular resource, like
2942: an HTML page, external resource, problem, etc., or it can be a
2943: container sequence, such as a "page" or a "map".
2944:
2945: To see a sequence from the user's point of view, please see the
2946: B<Creating a Course: Maps and Sequences> chapter of the Author's
2947: Manual.
2948:
2949: A Resource Object, once obtained from a navmap object via a B<getBy*>
2950: method of the navmap, or from an iterator, allows you to query
2951: information about that resource.
2952:
2953: Generally, you do not ever want to create a resource object yourself,
2954: so creation has been left undocumented. Always retrieve resources
2955: from navmap objects.
2956:
2957: =head3 Identifying Resources
2958:
2959: X<big hash>Every resource is identified by a Resource ID in the big hash that is
2960: unique to that resource for a given course. X<resource ID, in big hash>
2961: The Resource ID has the form #.#, where the first number is the same
2962: for every resource in a map, and the second is unique. For instance,
2963: for a course laid out like this:
2964:
2965: * Problem 1
2966: * Map
2967: * Resource 2
2968: * Resource 3
2969:
2970: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
2971: C<Resource 3> will share a first number. The second number may end up
2972: re-used between the two groups.
2973:
2974: The resource ID is only used in the big hash, but can be used in the
2975: context of a course to identify a resource easily. (For instance, the
2976: printing system uses it to record which resources from a sequence you
2977: wish to print.)
2978:
2979: X<symb> X<resource, symb>
2980: All resources also have B<symb>s, which uniquely identify a resource
2981: in a course. Many internal LON-CAPA functions expect a symb. A symb
2982: carries along with it the URL of the resource, and the map it appears
2983: in. Symbs are much larger then resource IDs.
2984:
2985: =cut
2986:
2987: sub new {
2988: # magic invocation to create a class instance
2989: my $proto = shift;
2990: my $class = ref($proto) || $proto;
2991: my $self = {};
2992:
2993: $self->{NAV_MAP} = shift;
2994: $self->{ID} = shift;
2995:
2996: # Store this new resource in the parent nav map's cache.
2997: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
2998: $self->{RESOURCE_ERROR} = 0;
2999:
3000: # A hash that can be used by two-pass algorithms to store data
3001: # about this resource in. Not used by the resource object
3002: # directly.
3003: $self->{DATA} = {};
3004:
3005: bless($self);
3006:
3007: return $self;
3008: }
3009:
3010: # private function: simplify the NAV_HASH lookups we keep doing
3011: # pass the name, and to automatically append my ID, pass a true val on the
3012: # second param
3013: sub navHash {
3014: my $self = shift;
3015: my $param = shift;
3016: my $id = shift;
3017: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3018: }
3019:
3020: =pod
3021:
3022: =head2 Methods
3023:
3024: Once you have a resource object, here's what you can do with it:
3025:
3026: =head3 Attribute Retrieval
3027:
3028: Every resource has certain attributes that can be retrieved and used:
3029:
3030: =over 4
3031:
3032: =item * B<ID>: Every resource has an ID that is unique for that
3033: resource in the course it is in. The ID is actually in the hash
3034: representing the resource, so for a resource object $res, obtain
3035: it via C<$res->{ID}).
3036:
3037: =item * B<compTitle>:
3038:
3039: Returns a "composite title", that is equal to $res->title() if the
3040: resource has a title, and is otherwise the last part of the URL (e.g.,
3041: "problem.problem").
3042:
3043: =item * B<ext>:
3044:
3045: Returns true if the resource is external.
3046:
3047: =item * B<kind>:
3048:
3049: Returns the kind of the resource from the compiled nav map.
3050:
3051: =item * B<randomout>:
3052:
3053: Returns true if this resource was chosen to NOT be shown to the user
3054: by the random map selection feature. In other words, this is usually
3055: false.
3056:
3057: =item * B<randompick>:
3058:
3059: Returns true for a map if the randompick feature is being used on the
3060: map. (?)
3061:
3062: =item * B<src>:
3063:
3064: Returns the source for the resource.
3065:
3066: =item * B<symb>:
3067:
3068: Returns the symb for the resource.
3069:
3070: =item * B<title>:
3071:
3072: Returns the title of the resource.
3073:
3074: =back
3075:
3076: =cut
3077:
3078: # These info functions can be used directly, as they don't return
3079: # resource information.
3080: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3081: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3082: sub from { my $self=shift; return $self->navHash("from_", 1); }
3083: # considered private and undocumented
3084: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3085: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3086: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3087: sub randompick {
3088: my $self = shift;
3089: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3090: '.0.parameter_randompick'};
3091: }
3092: sub src {
3093: my $self=shift;
3094: return $self->navHash("src_", 1);
3095: }
3096: sub symb {
3097: my $self=shift;
3098: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3099: my $symbSrc = &Apache::lonnet::declutter($self->src());
3100: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3101: . '___' . $second . '___' . $symbSrc;
3102: return &Apache::lonnet::symbclean($symb);
3103: }
3104: sub title {
3105: my $self=shift;
3106: if ($self->{ID} eq '0.0') {
3107: # If this is the top-level map, return the title of the course
3108: # since this map can not be titled otherwise.
3109: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3110: }
3111: return $self->navHash("title_", 1); }
3112: # considered private and undocumented
3113: sub to { my $self=shift; return $self->navHash("to_", 1); }
3114: sub compTitle {
3115: my $self = shift;
3116: my $title = $self->title();
3117: $title=~s/\&colon\;/\:/gs;
3118: if (!$title) {
3119: $title = $self->src();
3120: $title = substr($title, rindex($title, '/') + 1);
3121: }
3122: return $title;
3123: }
3124: =pod
3125:
3126: B<Predicate Testing the Resource>
3127:
3128: These methods are shortcuts to deciding if a given resource has a given property.
3129:
3130: =over 4
3131:
3132: =item * B<is_map>:
3133:
3134: Returns true if the resource is a map type.
3135:
3136: =item * B<is_problem>:
3137:
3138: Returns true if the resource is a problem type, false
3139: otherwise. (Looks at the extension on the src field; might need more
3140: to work correctly.)
3141:
3142: =item * B<is_page>:
3143:
3144: Returns true if the resource is a page.
3145:
3146: =item * B<is_sequence>:
3147:
3148: Returns true if the resource is a sequence.
3149:
3150: =back
3151:
3152: =cut
3153:
3154:
3155: sub is_html {
3156: my $self=shift;
3157: my $src = $self->src();
3158: return ($src =~ /html$/);
3159: }
3160: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3161: sub is_page {
3162: my $self=shift;
3163: my $src = $self->src();
3164: return $self->navHash("is_map_", 1) &&
3165: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3166: }
3167: sub is_problem {
3168: my $self=shift;
3169: my $src = $self->src();
3170: return ($src =~ /problem$/);
3171: }
3172: sub is_sequence {
3173: my $self=shift;
3174: my $src = $self->src();
3175: return $self->navHash("is_map_", 1) &&
3176: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3177: }
3178:
3179: # Private method: Shells out to the parmval in the nav map, handler parts.
3180: sub parmval {
3181: my $self = shift;
3182: my $what = shift;
3183: my $part = shift;
3184: if (!defined($part)) {
3185: $part = '0';
3186: }
3187: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3188: }
3189:
3190: =pod
3191:
3192: B<Map Methods>
3193:
3194: These methods are useful for getting information about the map
3195: properties of the resource, if the resource is a map (B<is_map>).
3196:
3197: =over 4
3198:
3199: =item * B<map_finish>:
3200:
3201: Returns a reference to a resource object corresponding to the finish
3202: resource of the map.
3203:
3204: =item * B<map_pc>:
3205:
3206: Returns the pc value of the map, which is the first number that
3207: appears in the resource ID of the resources in the map, and is the
3208: number that appears around the middle of the symbs of the resources in
3209: that map.
3210:
3211: =item * B<map_start>:
3212:
3213: Returns a reference to a resource object corresponding to the start
3214: resource of the map.
3215:
3216: =item * B<map_type>:
3217:
3218: Returns a string with the type of the map in it.
3219:
3220: =back
3221:
3222: =cut
3223:
3224: sub map_finish {
3225: my $self = shift;
3226: my $src = $self->src();
3227: $src = Apache::lonnet::clutter($src);
3228: my $res = $self->navHash("map_finish_$src", 0);
3229: $res = $self->{NAV_MAP}->getById($res);
3230: return $res;
3231: }
3232: sub map_pc {
3233: my $self = shift;
3234: my $src = $self->src();
3235: return $self->navHash("map_pc_$src", 0);
3236: }
3237: sub map_start {
3238: my $self = shift;
3239: my $src = $self->src();
3240: $src = Apache::lonnet::clutter($src);
3241: my $res = $self->navHash("map_start_$src", 0);
3242: $res = $self->{NAV_MAP}->getById($res);
3243: return $res;
3244: }
3245: sub map_type {
3246: my $self = shift;
3247: my $pc = $self->map_pc();
3248: return $self->navHash("map_type_$pc", 0);
3249: }
3250:
3251: #####
3252: # Property queries
3253: #####
3254:
3255: # These functions will be responsible for returning the CORRECT
3256: # VALUE for the parameter, no matter what. So while they may look
3257: # like direct calls to parmval, they can be more then that.
3258: # So, for instance, the duedate function should use the "duedatetype"
3259: # information, rather then the resource object user.
3260:
3261: =pod
3262:
3263: =head2 Resource Parameters
3264:
3265: In order to use the resource parameters correctly, the nav map must
3266: have been instantiated with genCourseAndUserOptions set to true, so
3267: the courseopt and useropt is read correctly. Then, you can call these
3268: functions to get the relevant parameters for the resource. Each
3269: function defaults to part "0", but can be directed to another part by
3270: passing the part as the parameter.
3271:
3272: These methods are responsible for getting the parameter correct, not
3273: merely reflecting the contents of the GDBM hashes. As we move towards
3274: dates relative to other dates, these methods should be updated to
3275: reflect that. (Then, anybody using these methods will not have to update
3276: their code.)
3277:
3278: =over 4
3279:
3280: =item * B<acc>:
3281:
3282: Get the Client IP/Name Access Control information.
3283:
3284: =item * B<answerdate>:
3285:
3286: Get the answer-reveal date for the problem.
3287:
3288: =item * B<awarded>:
3289:
3290: Gets the awarded value for the problem part. Requires genUserData set to
3291: true when the navmap object was created.
3292:
3293: =item * B<duedate>:
3294:
3295: Get the due date for the problem.
3296:
3297: =item * B<tries>:
3298:
3299: Get the number of tries the student has used on the problem.
3300:
3301: =item * B<maxtries>:
3302:
3303: Get the number of max tries allowed.
3304:
3305: =item * B<opendate>:
3306:
3307: Get the open date for the problem.
3308:
3309: =item * B<sig>:
3310:
3311: Get the significant figures setting.
3312:
3313: =item * B<tol>:
3314:
3315: Get the tolerance for the problem.
3316:
3317: =item * B<tries>:
3318:
3319: Get the number of tries the user has already used on the problem.
3320:
3321: =item * B<type>:
3322:
3323: Get the question type for the problem.
3324:
3325: =item * B<weight>:
3326:
3327: Get the weight for the problem.
3328:
3329: =back
3330:
3331: =cut
3332:
3333: sub acc {
3334: (my $self, my $part) = @_;
3335: return $self->parmval("acc", $part);
3336: }
3337: sub answerdate {
3338: (my $self, my $part) = @_;
3339: # Handle intervals
3340: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3341: return $self->duedate($part) +
3342: $self->parmval("answerdate", $part);
3343: }
3344: return $self->parmval("answerdate", $part);
3345: }
3346: sub awarded {
3347: my $self = shift; my $part = shift;
3348: $self->{NAV_MAP}->get_user_data();
3349: if (!defined($part)) { $part = '0'; }
3350: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3351: }
3352: sub duedate {
3353: (my $self, my $part) = @_;
3354: return $self->parmval("duedate", $part);
3355: }
3356: sub maxtries {
3357: (my $self, my $part) = @_;
3358: return $self->parmval("maxtries", $part);
3359: }
3360: sub opendate {
3361: (my $self, my $part) = @_;
3362: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3363: return $self->duedate($part) -
3364: $self->parmval("opendate", $part);
3365: }
3366: return $self->parmval("opendate");
3367: }
3368: sub problemstatus {
3369: (my $self, my $part) = @_;
3370: return lc $self->parmval("problemstatus", $part);
3371: }
3372: sub sig {
3373: (my $self, my $part) = @_;
3374: return $self->parmval("sig", $part);
3375: }
3376: sub tol {
3377: (my $self, my $part) = @_;
3378: return $self->parmval("tol", $part);
3379: }
3380: sub tries {
3381: my $self = shift;
3382: my $tries = $self->queryRestoreHash('tries', shift);
3383: if (!defined($tries)) { return '0';}
3384: return $tries;
3385: }
3386: sub type {
3387: (my $self, my $part) = @_;
3388: return $self->parmval("type", $part);
3389: }
3390: sub weight {
3391: my $self = shift; my $part = shift;
3392: if (!defined($part)) { $part = '0'; }
3393: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3394: $self->symb(), $ENV{'user.domain'},
3395: $ENV{'user.name'},
3396: $ENV{'request.course.sec'});
3397:
3398: }
3399:
3400: # Multiple things need this
3401: sub getReturnHash {
3402: my $self = shift;
3403:
3404: if (!defined($self->{RETURN_HASH})) {
3405: my %tmpHash = &Apache::lonnet::restore($self->symb());
3406: $self->{RETURN_HASH} = \%tmpHash;
3407: }
3408: }
3409:
3410: ######
3411: # Status queries
3412: ######
3413:
3414: # These methods query the status of problems.
3415:
3416: # If we need to count parts, this function determines the number of
3417: # parts from the metadata. When called, it returns a reference to a list
3418: # of strings corresponding to the parts. (Thus, using it in a scalar context
3419: # tells you how many parts you have in the problem:
3420: # $partcount = scalar($resource->countParts());
3421: # Don't use $self->{PARTS} directly because you don't know if it's been
3422: # computed yet.
3423:
3424: =pod
3425:
3426: =head2 Resource misc
3427:
3428: Misc. functions for the resource.
3429:
3430: =over 4
3431:
3432: =item * B<hasDiscussion>:
3433:
3434: Returns a false value if there has been discussion since the user last
3435: logged in, true if there has. Always returns false if the discussion
3436: data was not extracted when the nav map was constructed.
3437:
3438: =item * B<getFeedback>:
3439:
3440: Gets the feedback for the resource and returns the raw feedback string
3441: for the resource, or the null string if there is no feedback or the
3442: email data was not extracted when the nav map was constructed. Usually
3443: used like this:
3444:
3445: for (split(/\,/, $res->getFeedback())) {
3446: my $link = &Apache::lonnet::escape($_);
3447: ...
3448:
3449: and use the link as appropriate.
3450:
3451: =cut
3452:
3453: sub hasDiscussion {
3454: my $self = shift;
3455: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3456: }
3457:
3458: sub getFeedback {
3459: my $self = shift;
3460: my $source = $self->src();
3461: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3462: return $self->{NAV_MAP}->getFeedback($source);
3463: }
3464:
3465: sub getErrors {
3466: my $self = shift;
3467: my $source = $self->src();
3468: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3469: return $self->{NAV_MAP}->getErrors($source);
3470: }
3471:
3472: =pod
3473:
3474: =item * B<parts>():
3475:
3476: Returns a list reference containing sorted strings corresponding to
3477: each part of the problem. Single part problems have only a part '0'.
3478: Multipart problems do not return their part '0', since they typically
3479: do not really matter.
3480:
3481: =item * B<countParts>():
3482:
3483: Returns the number of parts of the problem a student can answer. Thus,
3484: for single part problems, returns 1. For multipart, it returns the
3485: number of parts in the problem, not including psuedo-part 0.
3486:
3487: =item * B<multipart>():
3488:
3489: Returns true if the problem is multipart, false otherwise. Use this instead
3490: of countParts if all you want is multipart/not multipart.
3491:
3492: =item * B<responseType>($part):
3493:
3494: Returns the response type of the part, without the word "response" on the
3495: end. Example return values: 'string', 'essay', 'numeric', etc.
3496:
3497: =item * B<responseIds>($part):
3498:
3499: Retreives the response IDs for the given part as an array reference containing
3500: strings naming the response IDs. This may be empty.
3501:
3502: =back
3503:
3504: =cut
3505:
3506: sub parts {
3507: my $self = shift;
3508:
3509: if ($self->ext) { return []; }
3510:
3511: $self->extractParts();
3512: return $self->{PARTS};
3513: }
3514:
3515: sub countParts {
3516: my $self = shift;
3517:
3518: my $parts = $self->parts();
3519:
3520: # If I left this here, then it's not necessary.
3521: #my $delta = 0;
3522: #for my $part (@$parts) {
3523: # if ($part eq '0') { $delta--; }
3524: #}
3525:
3526: if ($self->{RESOURCE_ERROR}) {
3527: return 0;
3528: }
3529:
3530: return scalar(@{$parts}); # + $delta;
3531: }
3532:
3533: sub multipart {
3534: my $self = shift;
3535: return $self->countParts() > 1;
3536: }
3537:
3538: sub singlepart {
3539: my $self = shift;
3540: return $self->countParts() == 1;
3541: }
3542:
3543: sub responseType {
3544: my $self = shift;
3545: my $part = shift;
3546:
3547: $self->extractParts();
3548: if (defined($self->{RESPONSE_TYPES}->{$part})) {
3549: return @{$self->{RESPONSE_TYPES}->{$part}};
3550: } else {
3551: return undef;
3552: }
3553: }
3554:
3555: sub responseIds {
3556: my $self = shift;
3557: my $part = shift;
3558:
3559: $self->extractParts();
3560: if (defined($self->{RESPONSE_IDS}->{$part})) {
3561: return @{$self->{RESPONSE_IDS}->{$part}};
3562: } else {
3563: return undef;
3564: }
3565: }
3566:
3567: # Private function: Extracts the parts information, both part names and
3568: # part types, and saves it.
3569: sub extractParts {
3570: my $self = shift;
3571:
3572: return if (defined($self->{PARTS}));
3573: return if ($self->ext);
3574:
3575: $self->{PARTS} = [];
3576:
3577: my %parts;
3578:
3579: # Retrieve part count, if this is a problem
3580: if ($self->is_problem()) {
3581: my $partorder;
3582: # Hypothetically, replace previous line with:
3583: # my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
3584: # and it'll all work...
3585: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3586:
3587: if ($partorder) {
3588: my @parts;
3589: for my $part (split (/,/,$partorder)) {
3590: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3591: push @parts, $part;
3592: }
3593: }
3594: $self->{PARTS} = \@parts;
3595: } else {
3596: if (!$metadata) {
3597: $self->{RESOURCE_ERROR} = 1;
3598: $self->{PARTS} = [];
3599: $self->{PART_TYPE} = {};
3600: return;
3601: }
3602: foreach (split(/\,/,$metadata)) {
3603: if ($_ =~ /^part_(.*)$/) {
3604: my $part = $1;
3605: # This floods the logs if it blows up
3606: if (defined($parts{$part})) {
3607: Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3608: }
3609:
3610: # check to see if part is turned off.
3611:
3612: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3613: $parts{$part} = 1;
3614: }
3615: }
3616: }
3617: my @sortedParts = sort keys %parts;
3618: $self->{PARTS} = \@sortedParts;
3619: }
3620:
3621:
3622: my %responseIdHash;
3623: my %responseTypeHash;
3624:
3625:
3626: # Init the responseIdHash
3627: foreach (@{$self->{PARTS}}) {
3628: $responseIdHash{$_} = [];
3629: }
3630:
3631: # Now, the unfortunate thing about this is that parts, part name, and
3632: # response id are delimited by underscores, but both the part
3633: # name and response id can themselves have underscores in them.
3634: # So we have to use our knowlege of part names to figure out
3635: # where the part names begin and end, and even then, it is possible
3636: # to construct ambiguous situations.
3637: foreach (split /,/, $metadata) {
3638: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3639: my $responseType = $1;
3640: my $partStuff = $2;
3641: my $partIdSoFar = '';
3642: my @partChunks = split /_/, $partStuff;
3643: my $i = 0;
3644:
3645: for ($i = 0; $i < scalar(@partChunks); $i++) {
3646: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3647: $partIdSoFar .= $partChunks[$i];
3648: if ($parts{$partIdSoFar}) {
3649: my @otherChunks = @partChunks[$i+1..$#partChunks];
3650: my $responseId = join('_', @otherChunks);
3651: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3652: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
3653: }
3654: }
3655: }
3656: }
3657:
3658: $self->{RESPONSE_IDS} = \%responseIdHash;
3659: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3660: }
3661:
3662: return;
3663: }
3664:
3665: =pod
3666:
3667: =head2 Resource Status
3668:
3669: Problem resources have status information, reflecting their various
3670: dates and completion statuses.
3671:
3672: There are two aspects to the status: the date-related information and
3673: the completion information.
3674:
3675: Idiomatic usage of these two methods would probably look something
3676: like
3677:
3678: foreach ($resource->parts()) {
3679: my $dateStatus = $resource->getDateStatus($_);
3680: my $completionStatus = $resource->getCompletionStatus($_);
3681:
3682: or
3683:
3684: my $status = $resource->status($_);
3685:
3686: ... use it here ...
3687: }
3688:
3689: Which you use depends on exactly what you are looking for. The
3690: status() function has been optimized for the nav maps display and may
3691: not precisely match what you need elsewhere.
3692:
3693: The symbolic constants shown below can be accessed through the
3694: resource object: C<$res->OPEN>.
3695:
3696: =over 4
3697:
3698: =item * B<getDateStatus>($part):
3699:
3700: ($part defaults to 0). A convenience function that returns a symbolic
3701: constant telling you about the date status of the part. The possible
3702: return values are:
3703:
3704: =back
3705:
3706: B<Date Codes>
3707:
3708: =over 4
3709:
3710: =item * B<OPEN_LATER>:
3711:
3712: The problem will be opened later.
3713:
3714: =item * B<OPEN>:
3715:
3716: Open and not yet due.
3717:
3718:
3719: =item * B<PAST_DUE_ANSWER_LATER>:
3720:
3721: The due date has passed, but the answer date has not yet arrived.
3722:
3723: =item * B<PAST_DUE_NO_ANSWER>:
3724:
3725: The due date has passed and there is no answer opening date set.
3726:
3727: =item * B<ANSWER_OPEN>:
3728:
3729: The answer date is here.
3730:
3731: =item * B<NETWORK_FAILURE>:
3732:
3733: The information is unknown due to network failure.
3734:
3735: =back
3736:
3737: =cut
3738:
3739: # Apparently the compiler optimizes these into constants automatically
3740: sub OPEN_LATER { return 0; }
3741: sub OPEN { return 1; }
3742: sub PAST_DUE_NO_ANSWER { return 2; }
3743: sub PAST_DUE_ANSWER_LATER { return 3; }
3744: sub ANSWER_OPEN { return 4; }
3745: sub NOTHING_SET { return 5; }
3746: sub NETWORK_FAILURE { return 100; }
3747:
3748: # getDateStatus gets the date status for a given problem part.
3749: # Because answer date, due date, and open date are fully independent
3750: # (i.e., it is perfectly possible to *only* have an answer date),
3751: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3752: # (past, future, none given). This function handles this with a decision
3753: # tree. Read the comments to follow the decision tree.
3754:
3755: sub getDateStatus {
3756: my $self = shift;
3757: my $part = shift;
3758: $part = "0" if (!defined($part));
3759:
3760: # Always return network failure if there was one.
3761: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3762:
3763: my $now = time();
3764:
3765: my $open = $self->opendate($part);
3766: my $due = $self->duedate($part);
3767: my $answer = $self->answerdate($part);
3768:
3769: if (!$open && !$due && !$answer) {
3770: # no data on the problem at all
3771: # should this be the same as "open later"? think multipart.
3772: return $self->NOTHING_SET;
3773: }
3774: if (!$open || $now < $open) {return $self->OPEN_LATER}
3775: if (!$due || $now < $due) {return $self->OPEN}
3776: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3777: if ($answer) { return $self->ANSWER_OPEN; }
3778: return PAST_DUE_NO_ANSWER;
3779: }
3780:
3781: =pod
3782:
3783: B<>
3784:
3785: =over 4
3786:
3787: =item * B<getCompletionStatus>($part):
3788:
3789: ($part defaults to 0.) A convenience function that returns a symbolic
3790: constant telling you about the completion status of the part, with the
3791: following possible results:
3792:
3793: =back
3794:
3795: B<Completion Codes>
3796:
3797: =over 4
3798:
3799: =item * B<NOT_ATTEMPTED>:
3800:
3801: Has not been attempted at all.
3802:
3803: =item * B<INCORRECT>:
3804:
3805: Attempted, but wrong by student.
3806:
3807: =item * B<INCORRECT_BY_OVERRIDE>:
3808:
3809: Attempted, but wrong by instructor override.
3810:
3811: =item * B<CORRECT>:
3812:
3813: Correct or correct by instructor.
3814:
3815: =item * B<CORRECT_BY_OVERRIDE>:
3816:
3817: Correct by instructor override.
3818:
3819: =item * B<EXCUSED>:
3820:
3821: Excused. Not yet implemented.
3822:
3823: =item * B<NETWORK_FAILURE>:
3824:
3825: Information not available due to network failure.
3826:
3827: =item * B<ATTEMPTED>:
3828:
3829: Attempted, and not yet graded.
3830:
3831: =back
3832:
3833: =cut
3834:
3835: sub NOT_ATTEMPTED { return 10; }
3836: sub INCORRECT { return 11; }
3837: sub INCORRECT_BY_OVERRIDE { return 12; }
3838: sub CORRECT { return 13; }
3839: sub CORRECT_BY_OVERRIDE { return 14; }
3840: sub EXCUSED { return 15; }
3841: sub ATTEMPTED { return 16; }
3842:
3843: sub getCompletionStatus {
3844: my $self = shift;
3845: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3846:
3847: my $status = $self->queryRestoreHash('solved', shift);
3848:
3849: # Left as seperate if statements in case we ever do more with this
3850: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3851: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3852: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3853: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3854: if ($status eq 'excused') {return $self->EXCUSED; }
3855: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3856: return $self->NOT_ATTEMPTED;
3857: }
3858:
3859: sub queryRestoreHash {
3860: my $self = shift;
3861: my $hashentry = shift;
3862: my $part = shift;
3863: $part = "0" if (!defined($part) || $part eq '');
3864: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3865:
3866: $self->getReturnHash();
3867:
3868: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3869: }
3870:
3871: =pod
3872:
3873: B<Composite Status>
3874:
3875: Along with directly returning the date or completion status, the
3876: resource object includes a convenience function B<status>() that will
3877: combine the two status tidbits into one composite status that can
3878: represent the status of the resource as a whole. This method represents
3879: the concept of the thing we want to display to the user on the nav maps
3880: screen, which is a combination of completion and open status. The precise logic is
3881: documented in the comments of the status method. The following results
3882: may be returned, all available as methods on the resource object
3883: ($res->NETWORK_FAILURE): In addition to the return values that match
3884: the date or completion status, this function can return "ANSWER_SUBMITTED"
3885: if that problemstatus parameter value is set to No, suppressing the
3886: incorrect/correct feedback.
3887:
3888: =over 4
3889:
3890: =item * B<NETWORK_FAILURE>:
3891:
3892: The network has failed and the information is not available.
3893:
3894: =item * B<NOTHING_SET>:
3895:
3896: No dates have been set for this problem (part) at all. (Because only
3897: certain parts of a multi-part problem may be assigned, this can not be
3898: collapsed into "open later", as we do not know a given part will EVER
3899: be opened. For single part, this is the same as "OPEN_LATER".)
3900:
3901: =item * B<CORRECT>:
3902:
3903: For any reason at all, the part is considered correct.
3904:
3905: =item * B<EXCUSED>:
3906:
3907: For any reason at all, the problem is excused.
3908:
3909: =item * B<PAST_DUE_NO_ANSWER>:
3910:
3911: The problem is past due, not considered correct, and no answer date is
3912: set.
3913:
3914: =item * B<PAST_DUE_ANSWER_LATER>:
3915:
3916: The problem is past due, not considered correct, and an answer date in
3917: the future is set.
3918:
3919: =item * B<ANSWER_OPEN>:
3920:
3921: The problem is past due, not correct, and the answer is now available.
3922:
3923: =item * B<OPEN_LATER>:
3924:
3925: The problem is not yet open.
3926:
3927: =item * B<TRIES_LEFT>:
3928:
3929: The problem is open, has been tried, is not correct, but there are
3930: tries left.
3931:
3932: =item * B<INCORRECT>:
3933:
3934: The problem is open, and all tries have been used without getting the
3935: correct answer.
3936:
3937: =item * B<OPEN>:
3938:
3939: The item is open and not yet tried.
3940:
3941: =item * B<ATTEMPTED>:
3942:
3943: The problem has been attempted.
3944:
3945: =item * B<ANSWER_SUBMITTED>:
3946:
3947: An answer has been submitted, but the student should not see it.
3948:
3949: =back
3950:
3951: =cut
3952:
3953: sub TRIES_LEFT { return 20; }
3954: sub ANSWER_SUBMITTED { return 21; }
3955:
3956: sub status {
3957: my $self = shift;
3958: my $part = shift;
3959: if (!defined($part)) { $part = "0"; }
3960: my $completionStatus = $self->getCompletionStatus($part);
3961: my $dateStatus = $self->getDateStatus($part);
3962:
3963: # What we have is a two-dimensional matrix with 4 entries on one
3964: # dimension and 5 entries on the other, which we want to colorize,
3965: # plus network failure and "no date data at all".
3966:
3967: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
3968: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3969:
3970: my $suppressFeedback = $self->problemstatus($part) eq 'no';
3971: # If there's an answer date and we're past it, don't
3972: # suppress the feedback; student should know
3973: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
3974: $suppressFeedback = 0;
3975: }
3976:
3977: # There are a few whole rows we can dispose of:
3978: if ($completionStatus == CORRECT ||
3979: $completionStatus == CORRECT_BY_OVERRIDE ) {
3980: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
3981: }
3982:
3983: if ($completionStatus == ATTEMPTED) {
3984: return ATTEMPTED;
3985: }
3986:
3987: # If it's EXCUSED, then return that no matter what
3988: if ($completionStatus == EXCUSED) {
3989: return EXCUSED;
3990: }
3991:
3992: if ($dateStatus == NOTHING_SET) {
3993: return NOTHING_SET;
3994: }
3995:
3996: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3997: # by 4 matrix (date statuses).
3998:
3999: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4000: $dateStatus == PAST_DUE_NO_ANSWER ) {
4001: return $dateStatus;
4002: }
4003:
4004: if ($dateStatus == ANSWER_OPEN) {
4005: return ANSWER_OPEN;
4006: }
4007:
4008: # Now: (incorrect, incorrect_override, not_attempted) x
4009: # (open_later), (open)
4010:
4011: if ($dateStatus == OPEN_LATER) {
4012: return OPEN_LATER;
4013: }
4014:
4015: # If it's WRONG...
4016: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4017: # and there are TRIES LEFT:
4018: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4019: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4020: }
4021: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4022: }
4023:
4024: # Otherwise, it's untried and open
4025: return OPEN;
4026: }
4027:
4028: sub CLOSED { return 23; }
4029: sub ERROR { return 24; }
4030:
4031: =pod
4032:
4033: B<Simple Status>
4034:
4035: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4036: "Simple status" corresponds to "which icon is shown on the
4037: Navmaps". There are six "simple" statuses:
4038:
4039: =over 4
4040:
4041: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4042:
4043: =item * B<OPEN>: The problem is open and unattempted.
4044:
4045: =item * B<CORRECT>: The problem is correct for any reason.
4046:
4047: =item * B<INCORRECT>: The problem is incorrect and can still be
4048: completed successfully.
4049:
4050: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4051: does not know if they are correct. (The ellipsis icon.)
4052:
4053: =item * B<ERROR>: There is an error retrieving information about this
4054: problem.
4055:
4056: =back
4057:
4058: =cut
4059:
4060: # This hash maps the composite status to this simple status, and
4061: # can be used directly, if you like
4062: my %compositeToSimple =
4063: (
4064: NETWORK_FAILURE() => ERROR,
4065: NOTHING_SET() => CLOSED,
4066: CORRECT() => CORRECT,
4067: EXCUSED() => CORRECT,
4068: PAST_DUE_NO_ANSWER() => INCORRECT,
4069: PAST_DUE_ANSWER_LATER() => INCORRECT,
4070: ANSWER_OPEN() => INCORRECT,
4071: OPEN_LATER() => CLOSED,
4072: TRIES_LEFT() => OPEN,
4073: INCORRECT() => INCORRECT,
4074: OPEN() => OPEN,
4075: ATTEMPTED() => ATTEMPTED,
4076: ANSWER_SUBMITTED() => ATTEMPTED
4077: );
4078:
4079: sub simpleStatus {
4080: my $self = shift;
4081: my $part = shift;
4082: my $status = $self->status($part);
4083: return $compositeToSimple{$status};
4084: }
4085:
4086: =pod
4087:
4088: B<simpleStatusCount> will return an array reference containing, in
4089: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4090: and ERROR parts the given problem has.
4091:
4092: =cut
4093:
4094: # This maps the status to the slot we want to increment
4095: my %statusToSlotMap =
4096: (
4097: OPEN() => 0,
4098: CLOSED() => 1,
4099: CORRECT() => 2,
4100: INCORRECT() => 3,
4101: ATTEMPTED() => 4,
4102: ERROR() => 5
4103: );
4104:
4105: sub statusToSlot { return $statusToSlotMap{shift()}; }
4106:
4107: sub simpleStatusCount {
4108: my $self = shift;
4109:
4110: my @counts = (0, 0, 0, 0, 0, 0, 0);
4111: foreach my $part (@{$self->parts()}) {
4112: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4113: }
4114:
4115: return \@counts;
4116: }
4117:
4118: =pod
4119:
4120: B<Completable>
4121:
4122: The completable method represents the concept of I<whether the student can
4123: currently do the problem>. If the student can do the problem, which means
4124: that it is open, there are tries left, and if the problem is manually graded
4125: or the grade is suppressed via problemstatus, the student has not tried it
4126: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4127: either the student has tried it and there is no feedback, or that for
4128: some reason it is no longer completable (not open yet, successfully completed,
4129: out of tries, etc.). As an example, this is used as the filter for the
4130: "Uncompleted Homework" option for the nav maps.
4131:
4132: If this does not quite meet your needs, do not fiddle with it (unless you are
4133: fixing it to better match the student's conception of "completable" because
4134: it's broken somehow)... make a new method.
4135:
4136: =cut
4137:
4138: sub completable {
4139: my $self = shift;
4140: if (!$self->is_problem()) { return 0; }
4141: my $partCount = $self->countParts();
4142:
4143: foreach my $part (@{$self->parts()}) {
4144: if ($part eq '0' && $partCount != 1) { next; }
4145: my $status = $self->status($part);
4146: # "If any of the parts are open, or have tries left (implies open),
4147: # and it is not "attempted" (manually graded problem), it is
4148: # not "complete"
4149: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4150: $status == ANSWER_SUBMITTED() ) {
4151: # did this part already, as well as we can
4152: next;
4153: }
4154: if ($status == OPEN() || $status == TRIES_LEFT()) {
4155: return 1;
4156: }
4157: }
4158:
4159: # If all the parts were complete, so was this problem.
4160: return 0;
4161: }
4162:
4163: =pod
4164:
4165: =head2 Resource/Nav Map Navigation
4166:
4167: =over 4
4168:
4169: =item * B<getNext>():
4170:
4171: Retreive an array of the possible next resources after this
4172: one. Always returns an array, even in the one- or zero-element case.
4173:
4174: =item * B<getPrevious>():
4175:
4176: Retreive an array of the possible previous resources from this
4177: one. Always returns an array, even in the one- or zero-element case.
4178:
4179: =cut
4180:
4181: sub getNext {
4182: my $self = shift;
4183: my @branches;
4184: my $to = $self->to();
4185: foreach my $branch ( split(/,/, $to) ) {
4186: my $choice = $self->{NAV_MAP}->getById($branch);
4187: my $next = $choice->goesto();
4188: $next = $self->{NAV_MAP}->getById($next);
4189:
4190: push @branches, $next;
4191: }
4192: return \@branches;
4193: }
4194:
4195: sub getPrevious {
4196: my $self = shift;
4197: my @branches;
4198: my $from = $self->from();
4199: foreach my $branch ( split /,/, $from) {
4200: my $choice = $self->{NAV_MAP}->getById($branch);
4201: my $prev = $choice->comesfrom();
4202: $prev = $self->{NAV_MAP}->getById($prev);
4203:
4204: push @branches, $prev;
4205: }
4206: return \@branches;
4207: }
4208:
4209: sub browsePriv {
4210: my $self = shift;
4211: if (defined($self->{BROWSE_PRIV})) {
4212: return $self->{BROWSE_PRIV};
4213: }
4214:
4215: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4216: }
4217:
4218: =pod
4219:
4220: =back
4221:
4222: =cut
4223:
4224: 1;
4225:
4226: __END__
4227:
4228:
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