File:
[LON-CAPA] /
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lonnavmaps.pm
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1.216:
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Thu Jul 17 18:40:49 2003 UTC (20 years, 10 months ago) by
bowersj2
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Major documentation updates; also a fix for the Uncompleted Homework
view; logic was broken and the view was suppressing multipart problems
that had *any* part done. So if there's a multipart problem with 20
parts, as soon as you completed one, it would disappear from the
Uncompleted Homework screen. Ick.
1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.216 2003/07/17 18:40:49 bowersj2 Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # (Page Handler
29: #
30: # (TeX Content Handler
31: #
32: # 05/29/00,05/30 Gerd Kortemeyer)
33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
35: #
36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
37: # YEAR=2002
38: # 1/1 Gerd Kortemeyer
39: # Oct-Nov Jeremy Bowers
40: # YEAR=2003
41: # Jeremy Bowers ... lots of days
42:
43: package Apache::lonnavmaps;
44:
45: use strict;
46: use Apache::Constants qw(:common :http);
47: use Apache::loncommon();
48: use Apache::lonmenu();
49: use POSIX qw (floor strftime);
50: use Data::Dumper; # for debugging, not always used
51:
52: # symbolic constants
53: sub SYMB { return 1; }
54: sub URL { return 2; }
55: sub NOTHING { return 3; }
56:
57: # Some data
58:
59: my $resObj = "Apache::lonnavmaps::resource";
60:
61: # Keep these mappings in sync with lonquickgrades, which uses the colors
62: # instead of the icons.
63: my %statusIconMap =
64: ( $resObj->NETWORK_FAILURE => '',
65: $resObj->NOTHING_SET => '',
66: $resObj->CORRECT => 'navmap.correct.gif',
67: $resObj->EXCUSED => 'navmap.correct.gif',
68: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
69: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
70: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
71: $resObj->OPEN_LATER => '',
72: $resObj->TRIES_LEFT => 'navmap.open.gif',
73: $resObj->INCORRECT => 'navmap.wrong.gif',
74: $resObj->OPEN => 'navmap.open.gif',
75: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
76: $resObj->ANSWER_SUBMITTED => 'navmap.ellipsis.gif' );
77:
78: my %iconAltTags =
79: ( 'navmap.correct.gif' => 'Correct',
80: 'navmap.wrong.gif' => 'Incorrect',
81: 'navmap.open.gif' => 'Open' );
82:
83: # Defines a status->color mapping, null string means don't color
84: my %colormap =
85: ( $resObj->NETWORK_FAILURE => '',
86: $resObj->CORRECT => '',
87: $resObj->EXCUSED => '#3333FF',
88: $resObj->PAST_DUE_ANSWER_LATER => '',
89: $resObj->PAST_DUE_NO_ANSWER => '',
90: $resObj->ANSWER_OPEN => '#006600',
91: $resObj->OPEN_LATER => '',
92: $resObj->TRIES_LEFT => '',
93: $resObj->INCORRECT => '',
94: $resObj->OPEN => '',
95: $resObj->NOTHING_SET => '',
96: $resObj->ATTEMPTED => '',
97: $resObj->ANSWER_SUBMITTED => ''
98: );
99: # And a special case in the nav map; what to do when the assignment
100: # is not yet done and due in less then 24 hours
101: my $hurryUpColor = "#FF0000";
102:
103: sub handler {
104: my $r = shift;
105: real_handler($r);
106: }
107:
108: sub real_handler {
109: my $r = shift;
110:
111: # Handle header-only request
112: if ($r->header_only) {
113: if ($ENV{'browser.mathml'}) {
114: $r->content_type('text/xml');
115: } else {
116: $r->content_type('text/html');
117: }
118: $r->send_http_header;
119: return OK;
120: }
121:
122: # Send header, don't cache this page
123: if ($ENV{'browser.mathml'}) {
124: $r->content_type('text/xml');
125: } else {
126: $r->content_type('text/html');
127: }
128: &Apache::loncommon::no_cache($r);
129: $r->send_http_header;
130:
131: # Create the nav map
132: my $navmap = Apache::lonnavmaps::navmap->new(
133: $ENV{"request.course.fn"}.".db",
134: $ENV{"request.course.fn"}."_parms.db", 1, 1);
135:
136:
137: if (!defined($navmap)) {
138: my $requrl = $r->uri;
139: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
140: return HTTP_NOT_ACCEPTABLE;
141: }
142:
143: $r->print("<html><head>\n");
144: $r->print("<title>Navigate Course Contents</title>");
145: # ------------------------------------------------------------ Get query string
146: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
147:
148: # ----------------------------------------------------- Force menu registration
149: my $addentries='';
150: if ($ENV{'form.register'}) {
151: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
152: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
153: $r->print(&Apache::lonmenu::registerurl(1));
154: }
155:
156: # Header
157: $r->print('</head>'.
158: &Apache::loncommon::bodytag('Navigate Course Contents','',
159: $addentries,'','',$ENV{'form.register'}));
160: $r->print('<script>window.focus();</script>');
161:
162: $r->rflush();
163:
164: # Now that we've displayed some stuff to the user, init the navmap
165: $navmap->init();
166:
167: $r->rflush();
168:
169: # Check that it's defined
170: if (!($navmap->courseMapDefined())) {
171: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
172: '</body></html>');
173: return OK;
174: }
175:
176: # See if there's only one map in the top-level, if we don't
177: # already have a filter... if so, automatically display it
178: if ($ENV{QUERY_STRING} !~ /filter/) {
179: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
180: my $depth = 1;
181: $iterator->next();
182: my $curRes = $iterator->next();
183: my $sequenceCount = 0;
184: my $sequenceId;
185: while ($depth > 0) {
186: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
187: if ($curRes == $iterator->END_MAP()) { $depth--; }
188:
189: if (ref($curRes) && $curRes->is_sequence()) {
190: $sequenceCount++;
191: $sequenceId = $curRes->map_pc();
192: }
193:
194: $curRes = $iterator->next();
195: }
196:
197: if ($sequenceCount == 1) {
198: # The automatic iterator creation in the render call
199: # will pick this up. We know the condition because
200: # the defined($ENV{'form.filter'}) also ensures this
201: # is a fresh call.
202: $ENV{'form.filter'} = "$sequenceId";
203: }
204: }
205:
206: my $jumpToFirstHomework = 0;
207: # Check to see if the student is jumping to next open, do-able problem
208: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
209: $jumpToFirstHomework = 1;
210: # Find the next homework problem that they can do.
211: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
212: my $depth = 1;
213: $iterator->next();
214: my $curRes = $iterator->next();
215: my $foundDoableProblem = 0;
216: my $problemRes;
217:
218: while ($depth > 0 && !$foundDoableProblem) {
219: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
220: if ($curRes == $iterator->END_MAP()) { $depth--; }
221:
222: if (ref($curRes) && $curRes->is_problem()) {
223: my $status = $curRes->status();
224: if ($curRes->completable()) {
225: $problemRes = $curRes;
226: $foundDoableProblem = 1;
227:
228: # Pop open all previous maps
229: my $stack = $iterator->getStack();
230: pop @$stack; # last resource in the stack is the problem
231: # itself, which we don't need in the map stack
232: my @mapPcs = map {$_->map_pc()} @$stack;
233: $ENV{'form.filter'} = join(',', @mapPcs);
234:
235: # Mark as both "here" and "jump"
236: $ENV{'form.postsymb'} = $curRes->symb();
237: }
238: }
239: } continue {
240: $curRes = $iterator->next();
241: }
242:
243: # If we found no problems, print a note to that effect.
244: if (!$foundDoableProblem) {
245: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
246: }
247: } else {
248: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
249: "Go To My First Homework Problem</a> ");
250: }
251:
252: my $suppressEmptySequences = 0;
253: my $filterFunc = undef;
254: my $resource_no_folder_link = 0;
255:
256: # Display only due homework.
257: my $showOnlyHomework = 0;
258: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
259: $showOnlyHomework = 1;
260: $suppressEmptySequences = 1;
261: $filterFunc = sub { my $res = shift;
262: return $res->completable() || $res->is_map();
263: };
264: $r->print("<p><font size='+2'>Uncompleted Homework</font></p>");
265: $ENV{'form.filter'} = '';
266: $ENV{'form.condition'} = 1;
267: $resource_no_folder_link = 1;
268: } else {
269: $r->print("<a href='navmaps?showOnlyHomework'>" .
270: "Show Only Uncompleted Homework</a> ");
271: }
272:
273: # renderer call
274: my $renderArgs = { 'cols' => [0,1,2,3],
275: 'url' => '/adm/navmaps',
276: 'navmap' => $navmap,
277: 'suppressNavmap' => 1,
278: 'suppressEmptySequences' => $suppressEmptySequences,
279: 'filterFunc' => $filterFunc,
280: 'resource_no_folder_link' => $resource_no_folder_link,
281: 'r' => $r};
282: my $render = render($renderArgs);
283: $navmap->untieHashes();
284:
285: # If no resources were printed, print a reassuring message so the
286: # user knows there was no error.
287: if ($renderArgs->{'counter'} == 0) {
288: if ($showOnlyHomework) {
289: $r->print("<p><font size='+1'>All homework is currently completed.</font></p>");
290: } else { # both jumpToFirstHomework and normal use the same: course must be empty
291: $r->print("<p><font size='+1'>This course is empty.</font></p>");
292: }
293: }
294:
295: $r->print("</body></html>");
296: $r->rflush();
297:
298: return OK;
299: }
300:
301: # Convenience functions: Returns a string that adds or subtracts
302: # the second argument from the first hash, appropriate for the
303: # query string that determines which folders to recurse on
304: sub addToFilter {
305: my $hashIn = shift;
306: my $addition = shift;
307: my %hash = %$hashIn;
308: $hash{$addition} = 1;
309:
310: return join (",", keys(%hash));
311: }
312:
313: sub removeFromFilter {
314: my $hashIn = shift;
315: my $subtraction = shift;
316: my %hash = %$hashIn;
317:
318: delete $hash{$subtraction};
319: return join(",", keys(%hash));
320: }
321:
322: # Convenience function: Given a stack returned from getStack on the iterator,
323: # return the correct src() value.
324: # Later, this should add an anchor when we start putting anchors in pages.
325: sub getLinkForResource {
326: my $stack = shift;
327: my $res;
328:
329: # Check to see if there are any pages in the stack
330: foreach $res (@$stack) {
331: if (defined($res) && $res->is_page()) {
332: return $res->src();
333: }
334: }
335:
336: # Failing that, return the src of the last resource that is defined
337: # (when we first recurse on a map, it puts an undefined resource
338: # on the bottom because $self->{HERE} isn't defined yet, and we
339: # want the src for the map anyhow)
340: foreach (@$stack) {
341: if (defined($_)) { $res = $_; }
342: }
343:
344: return $res->src();
345: }
346:
347: # Convenience function: This seperates the logic of how to create
348: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
349: # etc.) into a seperate function. It takes a resource object as the
350: # first parameter, and the part number of the resource as the second.
351: # It's basically a big switch statement on the status of the resource.
352:
353: sub getDescription {
354: my $res = shift;
355: my $part = shift;
356: my $status = $res->status($part);
357:
358: if ($status == $res->NETWORK_FAILURE) {
359: return "Having technical difficulties; please check status later";
360: }
361: if ($status == $res->NOTHING_SET) {
362: return "Not currently assigned.";
363: }
364: if ($status == $res->OPEN_LATER) {
365: return "Open " . timeToHumanString($res->opendate($part));
366: }
367: if ($status == $res->OPEN) {
368: if ($res->duedate($part)) {
369: return "Due " . timeToHumanString($res->duedate($part));
370: } else {
371: return "Open, no due date";
372: }
373: }
374: if ($status == $res->PAST_DUE_ANSWER_LATER) {
375: return "Answer open " . timeToHumanString($res->answerdate($part));
376: }
377: if ($status == $res->PAST_DUE_NO_ANSWER) {
378: return "Was due " . timeToHumanString($res->duedate($part));
379: }
380: if ($status == $res->ANSWER_OPEN) {
381: return "Answer available";
382: }
383: if ($status == $res->EXCUSED) {
384: return "Excused by instructor";
385: }
386: if ($status == $res->ATTEMPTED) {
387: return "Answer submitted, not yet graded.";
388: }
389: if ($status == $res->TRIES_LEFT) {
390: my $tries = $res->tries($part);
391: my $maxtries = $res->maxtries($part);
392: my $triesString = "";
393: if ($tries && $maxtries) {
394: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
395: if ($maxtries > 1 && $maxtries - $tries == 1) {
396: $triesString = "<b>$triesString</b>";
397: }
398: }
399: if ($res->duedate()) {
400: return "Due " . timeToHumanString($res->duedate($part)) .
401: " $triesString";
402: } else {
403: return "No due date $triesString";
404: }
405: }
406: if ($status == $res->ANSWER_SUBMITTED) {
407: return 'Answer submitted';
408: }
409: }
410:
411: # Convenience function, so others can use it: Is the problem due in less then
412: # 24 hours, and still can be done?
413:
414: sub dueInLessThen24Hours {
415: my $res = shift;
416: my $part = shift;
417: my $status = $res->status($part);
418:
419: return ($status == $res->OPEN() ||
420: $status == $res->TRIES_LEFT()) &&
421: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
422: $res->duedate() > time();
423: }
424:
425: # Convenience function, so others can use it: Is there only one try remaining for the
426: # part, with more then one try to begin with, not due yet and still can be done?
427: sub lastTry {
428: my $res = shift;
429: my $part = shift;
430:
431: my $tries = $res->tries($part);
432: my $maxtries = $res->maxtries($part);
433: return $tries && $maxtries && $maxtries > 1 &&
434: $maxtries - $tries == 1 && $res->duedate() &&
435: $res->duedate() > time();
436: }
437:
438: # This puts a human-readable name on the ENV variable.
439:
440: sub advancedUser {
441: return $ENV{'request.role.adv'};
442: }
443:
444:
445: # timeToHumanString takes a time number and converts it to a
446: # human-readable representation, meant to be used in the following
447: # manner:
448: # print "Due $timestring"
449: # print "Open $timestring"
450: # print "Answer available $timestring"
451: # Very, very, very, VERY English-only... goodness help a localizer on
452: # this func...
453: sub timeToHumanString {
454: my ($time) = @_;
455: # zero, '0' and blank are bad times
456: if (!$time) {
457: return 'never';
458: }
459:
460: my $now = time();
461:
462: my @time = localtime($time);
463: my @now = localtime($now);
464:
465: # Positive = future
466: my $delta = $time - $now;
467:
468: my $minute = 60;
469: my $hour = 60 * $minute;
470: my $day = 24 * $hour;
471: my $week = 7 * $day;
472: my $inPast = 0;
473:
474: # Logic in comments:
475: # Is it now? (extremely unlikely)
476: if ( $delta == 0 ) {
477: return "this instant";
478: }
479:
480: if ($delta < 0) {
481: $inPast = 1;
482: $delta = -$delta;
483: }
484:
485: if ( $delta > 0 ) {
486:
487: my $tense = $inPast ? " ago" : "";
488: my $prefix = $inPast ? "" : "in ";
489:
490: # Less then a minute
491: if ( $delta < $minute ) {
492: if ($delta == 1) { return "${prefix}1 second$tense"; }
493: return "$prefix$delta seconds$tense";
494: }
495:
496: # Less then an hour
497: if ( $delta < $hour ) {
498: # If so, use minutes
499: my $minutes = floor($delta / 60);
500: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
501: return "$prefix$minutes minutes$tense";
502: }
503:
504: # Is it less then 24 hours away? If so,
505: # display hours + minutes
506: if ( $delta < $hour * 24) {
507: my $hours = floor($delta / $hour);
508: my $minutes = floor(($delta % $hour) / $minute);
509: my $hourString = "$hours hours";
510: my $minuteString = ", $minutes minutes";
511: if ($hours == 1) {
512: $hourString = "1 hour";
513: }
514: if ($minutes == 1) {
515: $minuteString = ", 1 minute";
516: }
517: if ($minutes == 0) {
518: $minuteString = "";
519: }
520: return "$prefix$hourString$minuteString$tense";
521: }
522:
523: # Less then 5 days away, display day of the week and
524: # HH:MM
525: if ( $delta < $day * 5 ) {
526: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
527: $timeStr =~ s/12:00 am/midnight/;
528: $timeStr =~ s/12:00 pm/noon/;
529: return ($inPast ? "last " : "next ") .
530: $timeStr;
531: }
532:
533: # Is it this year?
534: if ( $time[5] == $now[5]) {
535: # Return on Month Day, HH:MM meridian
536: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
537: $timeStr =~ s/12:00 am/midnight/;
538: $timeStr =~ s/12:00 pm/noon/;
539: return $timeStr;
540: }
541:
542: # Not this year, so show the year
543: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
544: $timeStr =~ s/12:00 am/midnight/;
545: $timeStr =~ s/12:00 pm/noon/;
546: return $timeStr;
547: }
548: }
549:
550:
551: =pod
552:
553: =head1 NAME
554:
555: Apache::lonnavmap - Subroutines to handle and render the navigation maps
556:
557: =head1 SYNOPSIS
558:
559: The main handler generates the navigational listing for the course,
560: the other objects export this information in a usable fashion for
561: other modules.
562:
563: =head1 OVERVIEW
564:
565: When a user enters a course, LON-CAPA examines the course structure
566: and caches it in what is often referred to as the "big hash". You
567: can see it if you are logged into LON-CAPA, in a course, by going
568: to /adm/test. (You may need to tweak the /home/httpd/lonTabs/htpasswd
569: file to view it.) The content of the hash will be under the heading
570: "Big Hash".
571:
572: Big Hash contains, among other things, how resources are related
573: to each other (next/previous), what resources are maps, which
574: resources are being chosen to not show to the student (for random
575: selection), and a lot of other things that can take a lot of time
576: to compute due to the amount of data that needs to be collected and
577: processed.
578:
579: Apache::lonnavmaps provides an object model for manipulating this
580: information in a higher-level fashion then directly manipulating
581: the hash. It also provides access to several auxilary functions
582: that aren't necessarily stored in the Big Hash, but are a per-
583: resource sort of value, like whether there is any feedback on
584: a given resource.
585:
586: Apache::lonnavmaps also abstracts away branching, and someday,
587: conditions, for the times where you don't really care about those
588: things.
589:
590: Apache::lonnavmaps also provides fairly powerful routines for
591: rendering navmaps, and last but not least, provides the navmaps
592: view for when the user clicks the NAV button.
593:
594: B<Note>: Apache::lonnavmaps I<only> works for the "currently
595: logged in user"; if you want things like "due dates for another
596: student" lonnavmaps can not directly retrieve information like
597: that. You need the EXT function. This module can still help,
598: because many things, such as the course structure, are constant
599: between users, and Apache::lonnavmaps can help by providing
600: symbs for the EXT call.
601:
602: The rest of this file will cover the provided rendering routines,
603: which can often be used without fiddling with the navmap object at
604: all, then documents the Apache::lonnavmaps::navmap object, which
605: is the key to accessing the Big Hash information, covers the use
606: of the Iterator (which provides the logic for traversing the
607: somewhat-complicated Big Hash data structure), documents the
608: Apache::lonnavmaps::Resource objects that are returned by
609:
610: =head1 Subroutine: render
611:
612: The navmap renderer package provides a sophisticated rendering of the
613: standard navigation maps interface into HTML. The provided nav map
614: handler is actually just a glorified call to this.
615:
616: Because of the large number of parameters this function accepts,
617: instead of passing it arguments as is normal, pass it in an anonymous
618: hash with the desired options.
619:
620: The package provides a function called 'render', called as
621: Apache::lonnavmaps::render({}).
622:
623: =head2 Overview of Columns
624:
625: The renderer will build an HTML table for the navmap and return
626: it. The table is consists of several columns, and a row for each
627: resource (or possibly each part). You tell the renderer how many
628: columns to create and what to place in each column, optionally using
629: one or more of the prepared columns, and the renderer will assemble
630: the table.
631:
632: Any additional generally useful column types should be placed in the
633: renderer code here, so anybody can use it anywhere else. Any code
634: specific to the current application (such as the addition of <input>
635: elements in a column) should be placed in the code of the thing using
636: the renderer.
637:
638: At the core of the renderer is the array reference COLS (see Example
639: section below for how to pass this correctly). The COLS array will
640: consist of entries of one of two types of things: Either an integer
641: representing one of the pre-packaged column types, or a sub reference
642: that takes a resource reference, a part number, and a reference to the
643: argument hash passed to the renderer, and returns a string that will
644: be inserted into the HTML representation as it.
645:
646: All other parameters are ways of either changing how the columns
647: are printing, or which rows are shown.
648:
649: The pre-packaged column names are refered to by constants in the
650: Apache::lonnavmaps namespace. The following currently exist:
651:
652: =over 4
653:
654: =item * B<Apache::lonnavmaps::resource>:
655:
656: The general info about the resource: Link, icon for the type, etc. The
657: first column in the standard nav map display. This column provides the
658: indentation effect seen in the B<NAV> screen. This column also accepts
659: the following parameters in the renderer hash:
660:
661: =over 4
662:
663: =item * B<resource_nolink>: default false
664:
665: If true, the resource will not be linked. By default, all non-folder
666: resources are linked.
667:
668: =item * B<resource_part_count>: default true
669:
670: If true, the resource will show a part count B<if> the full
671: part list is not displayed. (See "condense_parts" later.) If false,
672: the resource will never show a part count.
673:
674: =item * B<resource_no_folder_link>:
675:
676: If true, the resource's folder will not be clickable to open or close
677: it. Default is false. True implies printCloseAll is false, since you
678: can't close or open folders when this is on anyhow.
679:
680: =back
681:
682: =item B<Apache::lonnavmaps::communication_status>:
683:
684: Whether there is discussion on the resource, email for the user, or
685: (lumped in here) perl errors in the execution of the problem. This is
686: the second column in the main nav map.
687:
688: =item B<Apache::lonnavmaps::quick_status>:
689:
690: An icon for the status of a problem, with five possible states:
691: Correct, incorrect, open, awaiting grading (for a problem where the
692: computer's grade is suppressed, or the computer can't grade, like
693: essay problem), or none (not open yet, not a problem). The
694: third column of the standard navmap.
695:
696: =item B<Apache::lonnavmaps::long_status>:
697:
698: A text readout of the details of the current status of the problem,
699: such as "Due in 22 hours". The fourth column of the standard navmap.
700:
701: =back
702:
703: If you add any others please be sure to document them here.
704:
705: An example of a column renderer that will show the ID number of a
706: resource, along with the part name if any:
707:
708: sub {
709: my ($resource, $part, $params) = @_;
710: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
711: return '<td>' . $resource->{ID} . '</td>';
712: }
713:
714: Note these functions are responsible for the TD tags, which allow them
715: to override vertical and horizontal alignment, etc.
716:
717: =head2 Parameters
718:
719: Most of these parameters are only useful if you are *not* using the
720: folder interface (i.e., the default first column), which is probably
721: the common case. If you are using this interface, then you should be
722: able to get away with just using 'cols' (to specify the columns
723: shown), 'url' (necessary for the folders to link to the current screen
724: correctly), and possibly 'queryString' if your app calls for it. In
725: that case, maintaining the state of the folders will be done
726: automatically.
727:
728: =over 4
729:
730: =item * B<iterator>: default: constructs one from %ENV
731:
732: A reference to a fresh ::iterator to use from the navmaps. The
733: rendering will reflect the options passed to the iterator, so you can
734: use that to just render a certain part of the course, if you like. If
735: one is not passed, the renderer will attempt to construct one from
736: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
737: 'iterator_map' parameter if any.
738:
739: =item * B<iterator_map>: default: not used
740:
741: If you are letting the renderer do the iterator handling, you can
742: instruct the renderer to render only a particular map by passing it
743: the source of the map you want to process, like
744: '/res/103/jerf/navmap.course.sequence'.
745:
746: =item * B<navmap>: default: constructs one from %ENV
747:
748: A reference to a navmap, used only if an iterator is not passed in. If
749: this is necessary to make an iterator but it is not passed in, a new
750: one will be constructed based on ENV info. This is useful to do basic
751: error checking before passing it off to render.
752:
753: =item * B<r>: default: must be passed in
754:
755: The standard Apache response object. This must be passed to the
756: renderer or the course hash will be locked.
757:
758: =item * B<cols>: default: empty (useless)
759:
760: An array reference
761:
762: =item * B<showParts>:default true
763:
764: A flag. If true, a line for the resource itself, and a line
765: for each part will be displayed. If not, only one line for each
766: resource will be displayed.
767:
768: =item * B<condenseParts>: default true
769:
770: A flag. If true, if all parts of the problem have the same
771: status and that status is Nothing Set, Correct, or Network Failure,
772: then only one line will be displayed for that resource anyhow. If no,
773: all parts will always be displayed. If showParts is 0, this is
774: ignored.
775:
776: =item * B<jumpCount>: default: determined from %ENV
777:
778: A string identifying the URL to place the anchor 'curloc' at.
779: It is the responsibility of the renderer user to
780: ensure that the #curloc is in the URL. By default, determined through
781: the use of the ENV{} 'jump' information, and should normally "just
782: work" correctly.
783:
784: =item * B<here>: default: empty string
785:
786: A Symb identifying where to place the 'here' marker. The empty
787: string means no marker.
788:
789: =item * B<indentString>: default: 25 pixel whitespace image
790:
791: A string identifying the indentation string to use.
792:
793: =item * B<queryString>: default: empty
794:
795: A string which will be prepended to the query string used when the
796: folders are opened or closed. You can use this to pass
797: application-specific values.
798:
799: =item * B<url>: default: none
800:
801: The url the folders will link to, which should be the current
802: page. Required if the resource info column is shown, and you
803: are allowing the user to open and close folders.
804:
805: =item * B<currentJumpIndex>: default: no jumping
806:
807: Describes the currently-open row number to cause the browser to jump
808: to, because the user just opened that folder. By default, pulled from
809: the Jump information in the ENV{'form.*'}.
810:
811: =item * B<printKey>: default: false
812:
813: If true, print the key that appears on the top of the standard
814: navmaps.
815:
816: =item * B<printCloseAll>: default: true
817:
818: If true, print the "Close all folders" or "open all folders"
819: links.
820:
821: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
822:
823: A function that takes the resource object as its only parameter and
824: returns a true or false value. If true, the resource is displayed. If
825: false, it is simply skipped in the display.
826:
827: =item * B<suppressEmptySequences>: default: false
828:
829: If you're using a filter function, and displaying sequences to orient
830: the user, then frequently some sequences will be empty. Setting this to
831: true will cause those sequences not to display, so as not to confuse the
832: user into thinking that if the sequence is there there should be things
833: under it; for example, see the "Show Uncompleted Homework" view on the
834: B<NAV> screen.
835:
836: =item * B<suppressNavmaps>: default: false
837:
838: If true, will not display Navigate Content resources.
839:
840: =back
841:
842: =head2 Additional Info
843:
844: In addition to the parameters you can pass to the renderer, which will
845: be passed through unchange to the column renderers, the renderer will
846: generate the following information which your renderer may find
847: useful:
848:
849: =over 4
850:
851: =item * B<counter>:
852:
853: Contains the number of rows printed. Useful after calling the render
854: function, as you can detect whether anything was printed at all.
855:
856: =item * B<isNewBranch>:
857:
858: Useful for renderers: If this resource is currently the first resource
859: of a new branch, this will be true. The Resource column (leftmost in the
860: navmaps screen) uses this to display the "new branch" icon
861:
862: =back
863:
864: =cut
865:
866: sub resource { return 0; }
867: sub communication_status { return 1; }
868: sub quick_status { return 2; }
869: sub long_status { return 3; }
870:
871: # Data for render_resource
872:
873: sub render_resource {
874: my ($resource, $part, $params) = @_;
875:
876: my $nonLinkedText = ''; # stuff after resource title not in link
877:
878: my $link = $params->{"resourceLink"};
879: my $src = $resource->src();
880: my $it = $params->{"iterator"};
881: my $filter = $it->{FILTER};
882:
883: my $title = $resource->compTitle();
884: if ($src =~ /^\/uploaded\//) {
885: $nonLinkedText=$title;
886: $title = '';
887: }
888: my $partLabel = "";
889: my $newBranchText = "";
890:
891: # If this is a new branch, label it so
892: if ($params->{'isNewBranch'}) {
893: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
894: }
895:
896: # links to open and close the folder
897: my $linkopen = "<a href='$link'>";
898: my $linkclose = "</a>";
899:
900: # Default icon: unknown page
901: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
902:
903: if ($resource->is_problem()) {
904: if ($part eq '0' || $params->{'condensed'}) {
905: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
906: } else {
907: $icon = $params->{'indentString'};
908: }
909: } else {
910: my $curfext= (split (/\./,$resource->src))[-1];
911: my $embstyle = &Apache::loncommon::fileembstyle($curfext);
912: # The unless conditional that follows is a bit of overkill
913: if (!(!defined($embstyle) || $embstyle eq 'unk' || $embstyle eq 'hdn')) {
914: $icon = "<img src='/adm/lonIcons/$curfext.gif' alt='' border='0' />";
915: }
916: }
917:
918: # Display the correct map icon to open or shut map
919: if ($resource->is_map()) {
920: my $mapId = $resource->map_pc();
921: my $nowOpen = !defined($filter->{$mapId});
922: if ($it->{CONDITION}) {
923: $nowOpen = !$nowOpen;
924: }
925:
926: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
927:
928: if (!$params->{'resource_no_folder_link'}) {
929: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
930: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
931:
932: $linkopen = "<a href='" . $params->{'url'} . '?' .
933: $params->{'queryString'} . '&filter=';
934: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
935: addToFilter($filter, $mapId) :
936: removeFromFilter($filter, $mapId);
937: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
938: . $params->{'hereType'} . '&here=' .
939: &Apache::lonnet::escape($params->{'here'}) .
940: '&jump=' .
941: &Apache::lonnet::escape($resource->symb()) .
942: "&folderManip=1'>";
943: } else {
944: # Don't allow users to manipulate folder
945: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
946: '.nomanip.gif';
947: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
948:
949: $linkopen = "";
950: $linkclose = "";
951: }
952: }
953:
954: if ($resource->randomout()) {
955: $nonLinkedText .= ' <i>(hidden)</i> ';
956: }
957:
958: # We're done preparing and finally ready to start the rendering
959: my $result = "<td align='left' valign='center'>";
960:
961: my $indentLevel = $params->{'indentLevel'};
962: if ($newBranchText) { $indentLevel--; }
963:
964: # print indentation
965: for (my $i = 0; $i < $indentLevel; $i++) {
966: $result .= $params->{'indentString'};
967: }
968:
969: # Decide what to display
970: $result .= "$newBranchText$linkopen$icon$linkclose";
971:
972: my $curMarkerBegin = '';
973: my $curMarkerEnd = '';
974:
975: # Is this the current resource?
976: if (!$params->{'displayedHereMarker'} &&
977: $resource->symb() eq $params->{'here'} ) {
978: $curMarkerBegin = '<font color="red" size="+2">> </font>';
979: $curMarkerEnd = '<font color="red" size="+2"><</font>';
980: $params->{'displayedHereMarker'} = 1;
981: }
982:
983: if ($resource->is_problem() && $part ne '0' &&
984: !$params->{'condensed'}) {
985: $partLabel = " (Part $part)";
986: $title = "";
987: }
988:
989: if ($params->{'condensed'} && $resource->countParts() > 1) {
990: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
991: }
992:
993: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\// &&
994: !$resource->is_sequence()) {
995: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
996: } else {
997: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
998: }
999:
1000: return $result;
1001: }
1002:
1003: sub render_communication_status {
1004: my ($resource, $part, $params) = @_;
1005: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1006:
1007: my $link = $params->{"resourceLink"};
1008: my $linkopen = "<a href='$link'>";
1009: my $linkclose = "</a>";
1010:
1011: if ($resource->hasDiscussion()) {
1012: $discussionHTML = $linkopen .
1013: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
1014: $linkclose;
1015: }
1016:
1017: if ($resource->getFeedback()) {
1018: my $feedback = $resource->getFeedback();
1019: foreach (split(/\,/, $feedback)) {
1020: if ($_) {
1021: $feedbackHTML .= ' <a href="/adm/email?display='
1022: . &Apache::lonnet::escape($_) . '">'
1023: . '<img src="/adm/lonMisc/feedback.gif" '
1024: . 'border="0" /></a>';
1025: }
1026: }
1027: }
1028:
1029: if ($resource->getErrors()) {
1030: my $errors = $resource->getErrors();
1031: foreach (split(/,/, $errors)) {
1032: if ($_) {
1033: $errorHTML .= ' <a href="/adm/email?display='
1034: . &Apache::lonnet::escape($_) . '">'
1035: . '<img src="/adm/lonMisc/bomb.gif" '
1036: . 'border="0" /></a>';
1037: }
1038: }
1039: }
1040:
1041: if ($params->{'multipart'} && $part != '0') {
1042: $discussionHTML = $feedbackHTML = $errorHTML = '';
1043: }
1044:
1045: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1046:
1047: }
1048: sub render_quick_status {
1049: my ($resource, $part, $params) = @_;
1050: my $result = "";
1051: my $firstDisplayed = !$params->{'condensed'} &&
1052: $params->{'multipart'} && $part eq "0";
1053:
1054: my $link = $params->{"resourceLink"};
1055: my $linkopen = "<a href='$link'>";
1056: my $linkclose = "</a>";
1057:
1058: if ($resource->is_problem() &&
1059: !$firstDisplayed) {
1060: my $icon = $statusIconMap{$resource->status($part)};
1061: my $alt = $iconAltTags{$icon};
1062: if ($icon) {
1063: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1064: } else {
1065: $result .= "<td width='30'> </td>\n";
1066: }
1067: } else { # not problem, no icon
1068: $result .= "<td width='30'> </td>\n";
1069: }
1070:
1071: return $result;
1072: }
1073: sub render_long_status {
1074: my ($resource, $part, $params) = @_;
1075: my $result = "<td align='right' valign='center'>\n";
1076: my $firstDisplayed = !$params->{'condensed'} &&
1077: $params->{'multipart'} && $part eq "0";
1078:
1079: my $color;
1080: if ($resource->is_problem()) {
1081: $color = $colormap{$resource->status};
1082:
1083: if (dueInLessThen24Hours($resource, $part) ||
1084: lastTry($resource, $part)) {
1085: $color = $hurryUpColor;
1086: }
1087: }
1088:
1089: if ($resource->kind() eq "res" &&
1090: $resource->is_problem() &&
1091: !$firstDisplayed) {
1092: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1093: $result .= getDescription($resource, $part);
1094: if ($color) {$result .= "</b></font>"; }
1095: }
1096: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1097: $result .= '(randomly select ' . $resource->randompick() .')';
1098: }
1099:
1100: # Debugging code
1101: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1102: # ' - Part: ' . $part;
1103:
1104: $result .= "</td>\n";
1105:
1106: return $result;
1107: }
1108:
1109: my @preparedColumns = (\&render_resource, \&render_communication_status,
1110: \&render_quick_status, \&render_long_status);
1111:
1112: sub setDefault {
1113: my ($val, $default) = @_;
1114: if (!defined($val)) { return $default; }
1115: return $val;
1116: }
1117:
1118: sub render {
1119: my $args = shift;
1120: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1121: my $result = '';
1122:
1123: # Configure the renderer.
1124: my $cols = $args->{'cols'};
1125: if (!defined($cols)) {
1126: # no columns, no nav maps.
1127: return '';
1128: }
1129: my $mustCloseNavMap = 0;
1130: my $navmap;
1131: if (defined($args->{'navmap'})) {
1132: $navmap = $args->{'navmap'};
1133: }
1134:
1135: my $r = $args->{'r'};
1136: my $queryString = $args->{'queryString'};
1137: my $jump = $args->{'jump'};
1138: my $here = $args->{'here'};
1139: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1140: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1141: # before the current resource when using #current
1142:
1143: # If we were passed 'here' information, we are not rendering
1144: # after a folder manipulation, and we were not passed an
1145: # iterator, make sure we open the folders to show the "here"
1146: # marker
1147: my $filterHash = {};
1148: # Figure out what we're not displaying
1149: foreach (split(/\,/, $ENV{"form.filter"})) {
1150: if ($_) {
1151: $filterHash->{$_} = "1";
1152: }
1153: }
1154:
1155: # Filter: Remember filter function and add our own filter: Refuse
1156: # to show hidden resources unless the user can see them.
1157: my $userCanSeeHidden = advancedUser();
1158: my $filterFunc = setDefault($args->{'filterFunc'},
1159: sub {return 1;});
1160: if (!$userCanSeeHidden) {
1161: # Without renaming the filterfunc, the server seems to go into
1162: # an infinite loop
1163: my $oldFilterFunc = $filterFunc;
1164: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1165: &$oldFilterFunc($res);};
1166: }
1167:
1168: my $condition = 0;
1169: if ($ENV{'form.condition'}) {
1170: $condition = 1;
1171: }
1172:
1173: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1174: # Step 1: Check to see if we have a navmap
1175: if (!defined($navmap)) {
1176: $navmap = Apache::lonnavmaps::navmap->new(
1177: $ENV{"request.course.fn"}.".db",
1178: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1179: $mustCloseNavMap = 1;
1180: }
1181: $navmap->init();
1182:
1183: # Step two: Locate what kind of here marker is necessary
1184: # Determine where the "here" marker is and where the screen jumps to.
1185:
1186: if ($ENV{'form.postsymb'}) {
1187: $here = $jump = $ENV{'form.postsymb'};
1188: } elsif ($ENV{'form.postdata'}) {
1189: # couldn't find a symb, is there a URL?
1190: my $currenturl = $ENV{'form.postdata'};
1191: #$currenturl=~s/^http\:\/\///;
1192: #$currenturl=~s/^[^\/]+//;
1193:
1194: $here = $jump = &Apache::lonnet::symbread($currenturl);
1195: }
1196:
1197: # Step three: Ensure the folders are open
1198: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1199: my $depth = 1;
1200: $mapIterator->next(); # discard the first BEGIN_MAP
1201: my $curRes = $mapIterator->next();
1202: my $found = 0;
1203:
1204: # We only need to do this if we need to open the maps to show the
1205: # current position. This will change the counter so we can't count
1206: # for the jump marker with this loop.
1207: while ($depth > 0 && !$found) {
1208: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1209: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1210:
1211: if (ref($curRes) && $curRes->symb() eq $here) {
1212: my $mapStack = $mapIterator->getStack();
1213:
1214: # Ensure the parent maps are open
1215: for my $map (@{$mapStack}) {
1216: if ($condition) {
1217: undef $filterHash->{$map->map_pc()};
1218: } else {
1219: $filterHash->{$map->map_pc()} = 1;
1220: }
1221: }
1222: $found = 1;
1223: }
1224:
1225: $curRes = $mapIterator->next();
1226: }
1227: }
1228:
1229: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1230: # If this is a click on a folder or something, we want to preserve the "here"
1231: # from the querystring, and get the new "jump" marker
1232: $here = $ENV{'form.here'};
1233: $jump = $ENV{'form.jump'};
1234: }
1235:
1236: my $it = $args->{'iterator'};
1237: if (!defined($it)) {
1238: # Construct a default iterator based on $ENV{'form.'} information
1239:
1240: # Step 1: Check to see if we have a navmap
1241: if (!defined($navmap)) {
1242: $navmap = Apache::lonnavmaps::navmap->new($r,
1243: $ENV{"request.course.fn"}.".db",
1244: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1245: $mustCloseNavMap = 1;
1246: }
1247: # Paranoia: Make sure it's ready
1248: $navmap->init();
1249:
1250: # See if we're being passed a specific map
1251: if ($args->{'iterator_map'}) {
1252: my $map = $args->{'iterator_map'};
1253: $map = $navmap->getResourceByUrl($map);
1254: my $firstResource = $map->map_start();
1255: my $finishResource = $map->map_finish();
1256:
1257: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1258: } else {
1259: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1260: }
1261: }
1262:
1263: # (re-)Locate the jump point, if any
1264: # Note this does not take filtering or hidden into account... need
1265: # to be fixed?
1266: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1267: my $depth = 1;
1268: $mapIterator->next();
1269: my $curRes = $mapIterator->next();
1270: my $foundJump = 0;
1271: my $counter = 0;
1272:
1273: while ($depth > 0 && !$foundJump) {
1274: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1275: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1276: if (ref($curRes)) { $counter++; }
1277:
1278: if (ref($curRes) && $jump eq $curRes->symb()) {
1279:
1280: # This is why we have to use the main iterator instead of the
1281: # potentially faster DFS: The count has to be the same, so
1282: # the order has to be the same, which DFS won't give us.
1283: $args->{'currentJumpIndex'} = $counter;
1284: $foundJump = 1;
1285: }
1286:
1287: $curRes = $mapIterator->next();
1288: }
1289:
1290: my $showParts = setDefault($args->{'showParts'}, 1);
1291: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1292: # keeps track of when the current resource is found,
1293: # so we can back up a few and put the anchor above the
1294: # current resource
1295: my $printKey = $args->{'printKey'};
1296: my $printCloseAll = $args->{'printCloseAll'};
1297: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1298:
1299: # Print key?
1300: if ($printKey) {
1301: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1302: my $date=localtime;
1303: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1304: if ($navmap->{LAST_CHECK}) {
1305: $result .=
1306: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1307: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1308: '</td><td align="center" valign="bottom"> '.
1309: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1310: '</td>';
1311: } else {
1312: $result .= '<td align="center" valign="bottom"> '.
1313: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1314: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1315: '</td>';
1316: }
1317:
1318: $result .= '</tr></table>';
1319: }
1320:
1321: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1322: if ($condition) {
1323: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1324: "&here=" . Apache::lonnet::escape($here) .
1325: "\">Close All Folders</a>";
1326: } else {
1327: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1328: "&here=" . Apache::lonnet::escape($here) .
1329: "\">Open All Folders</a>";
1330: }
1331: $result .= "<br /><br />\n";
1332: }
1333:
1334: if ($r) {
1335: $r->print($result);
1336: $r->rflush();
1337: $result = "";
1338: }
1339: # End parameter setting
1340:
1341: # Data
1342: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1343: my $res = "Apache::lonnavmaps::resource";
1344: my %condenseStatuses =
1345: ( $res->NETWORK_FAILURE => 1,
1346: $res->NOTHING_SET => 1,
1347: $res->CORRECT => 1 );
1348: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1349:
1350: # Shared variables
1351: $args->{'counter'} = 0; # counts the rows
1352: $args->{'indentLevel'} = 0;
1353: $args->{'isNewBranch'} = 0;
1354: $args->{'condensed'} = 0;
1355: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1356: $args->{'displayedHereMarker'} = 0;
1357:
1358: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1359: # since structure actually doesn't matter, except what map has what resources.
1360: if ($args->{'suppressEmptySequences'}) {
1361: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1362: $it->{FIRST_RESOURCE},
1363: $it->{FINISH_RESOURCE},
1364: {}, undef, 1);
1365: $depth = 0;
1366: $dfsit->next();
1367: my $curRes = $dfsit->next();
1368: while ($depth > -1) {
1369: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1370: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1371:
1372: if (ref($curRes)) {
1373: # Parallel pre-processing: Do sequences have non-filtered-out children?
1374: if ($curRes->is_map()) {
1375: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1376: # Sequences themselves do not count as visible children,
1377: # unless those sequences also have visible children.
1378: # This means if a sequence appears, there's a "promise"
1379: # that there's something under it if you open it, somewhere.
1380: } else {
1381: # Not a sequence: if it's filtered, ignore it, otherwise
1382: # rise up the stack and mark the sequences as having children
1383: if (&$filterFunc($curRes)) {
1384: for my $sequence (@{$dfsit->getStack()}) {
1385: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1386: }
1387: }
1388: }
1389: }
1390: } continue {
1391: $curRes = $dfsit->next();
1392: }
1393: }
1394:
1395: my $displayedJumpMarker = 0;
1396: # Set up iteration.
1397: $depth = 1;
1398: $it->next(); # discard initial BEGIN_MAP
1399: $curRes = $it->next();
1400: my $now = time();
1401: my $in24Hours = $now + 24 * 60 * 60;
1402: my $rownum = 0;
1403:
1404: # export "here" marker information
1405: $args->{'here'} = $here;
1406:
1407: while ($depth > 0) {
1408: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1409: if ($curRes == $it->END_MAP()) { $depth--; }
1410:
1411: # Maintain indentation level.
1412: if ($curRes == $it->BEGIN_MAP() ||
1413: $curRes == $it->BEGIN_BRANCH() ) {
1414: $args->{'indentLevel'}++;
1415: }
1416: if ($curRes == $it->END_MAP() ||
1417: $curRes == $it->END_BRANCH() ) {
1418: $args->{'indentLevel'}--;
1419: }
1420: # Notice new branches
1421: if ($curRes == $it->BEGIN_BRANCH()) {
1422: $args->{'isNewBranch'} = 1;
1423: }
1424:
1425: # If this isn't an actual resource, continue on
1426: if (!ref($curRes)) {
1427: next;
1428: }
1429:
1430: # If this has been filtered out, continue on
1431: if (!(&$filterFunc($curRes))) {
1432: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1433: next;
1434: }
1435:
1436: # If this is an empty sequence and we're filtering them, continue on
1437: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1438: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1439: next;
1440: }
1441:
1442: # If we're suppressing navmaps and this is a navmap, continue on
1443: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1444: next;
1445: }
1446:
1447: $args->{'counter'}++;
1448:
1449: # Does it have multiple parts?
1450: $args->{'multipart'} = 0;
1451: $args->{'condensed'} = 0;
1452: my @parts;
1453:
1454: # Decide what parts to show.
1455: if ($curRes->is_problem() && $showParts) {
1456: @parts = @{$curRes->parts()};
1457: $args->{'multipart'} = $curRes->multipart();
1458:
1459: if ($condenseParts) { # do the condensation
1460: if (!$curRes->opendate("0")) {
1461: @parts = ();
1462: $args->{'condensed'} = 1;
1463: }
1464: if (!$args->{'condensed'}) {
1465: # Decide whether to condense based on similarity
1466: my $status = $curRes->status($parts[0]);
1467: my $due = $curRes->duedate($parts[0]);
1468: my $open = $curRes->opendate($parts[0]);
1469: my $statusAllSame = 1;
1470: my $dueAllSame = 1;
1471: my $openAllSame = 1;
1472: for (my $i = 1; $i < scalar(@parts); $i++) {
1473: if ($curRes->status($parts[$i]) != $status){
1474: $statusAllSame = 0;
1475: }
1476: if ($curRes->duedate($parts[$i]) != $due ) {
1477: $dueAllSame = 0;
1478: }
1479: if ($curRes->opendate($parts[$i]) != $open) {
1480: $openAllSame = 0;
1481: }
1482: }
1483: # $*allSame is true if all the statuses were
1484: # the same. Now, if they are all the same and
1485: # match one of the statuses to condense, or they
1486: # are all open with the same due date, or they are
1487: # all OPEN_LATER with the same open date, display the
1488: # status of the first non-zero part (to get the 'correct'
1489: # status right, since 0 is never 'correct' or 'open').
1490: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1491: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1492: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1493: @parts = ($parts[0]);
1494: $args->{'condensed'} = 1;
1495: }
1496: }
1497: # Multipart problem with one part: always "condense" (happens
1498: # to match the desirable behavior)
1499: if ($curRes->countParts() == 1) {
1500: @parts = ($parts[0]);
1501: $args->{'condensed'} = 1;
1502: }
1503: }
1504: }
1505:
1506: # If the multipart problem was condensed, "forget" it was multipart
1507: if (scalar(@parts) == 1) {
1508: $args->{'multipart'} = 0;
1509: } else {
1510: # Add part 0 so we display it correctly.
1511: unshift @parts, '0';
1512: }
1513:
1514: # Now, we've decided what parts to show. Loop through them and
1515: # show them.
1516: foreach my $part (@parts) {
1517: $rownum ++;
1518: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1519:
1520: $result .= " <tr bgcolor='$backgroundColor'>\n";
1521:
1522: # Set up some data about the parts that the cols might want
1523: my $filter = $it->{FILTER};
1524: my $stack = $it->getStack();
1525: my $src = getLinkForResource($stack);
1526:
1527: my $srcHasQuestion = $src =~ /\?/;
1528: $args->{"resourceLink"} = $src.
1529: ($srcHasQuestion?'&':'?') .
1530: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1531:
1532: # Now, display each column.
1533: foreach my $col (@$cols) {
1534: my $colHTML = '';
1535: if (ref($col)) {
1536: $colHTML .= &$col($curRes, $part, $args);
1537: } else {
1538: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1539: }
1540:
1541: # If this is the first column and it's time to print
1542: # the anchor, do so
1543: if ($col == $cols->[0] &&
1544: $args->{'counter'} == $args->{'currentJumpIndex'} -
1545: $currentJumpDelta) {
1546: # Jam the anchor after the <td> tag;
1547: # necessary for valid HTML (which Mozilla requires)
1548: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1549: $displayedJumpMarker = 1;
1550: }
1551: $result .= $colHTML . "\n";
1552: }
1553: $result .= " </tr>\n";
1554: $args->{'isNewBranch'} = 0;
1555: }
1556:
1557: if ($r && $rownum % 20 == 0) {
1558: $r->print($result);
1559: $result = "";
1560: $r->rflush();
1561: }
1562: } continue {
1563: $curRes = $it->next();
1564:
1565: if ($r) {
1566: # If we have the connection, make sure the user is still connected
1567: my $c = $r->connection;
1568: if ($c->aborted()) {
1569: Apache::lonnet::logthis("navmaps aborted");
1570: # Who cares what we do, nobody will see it anyhow.
1571: return '';
1572: }
1573: }
1574: }
1575:
1576: # Print out the part that jumps to #curloc if it exists
1577: # delay needed because the browser is processing the jump before
1578: # it finishes rendering, so it goes to the wrong place!
1579: # onload might be better, but this routine has no access to that.
1580: # On mozilla, the 0-millisecond timeout seems to prevent this;
1581: # it's quite likely this might fix other browsers, too, and
1582: # certainly won't hurt anything.
1583: if ($displayedJumpMarker) {
1584: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1585: }
1586:
1587: $result .= "</table>";
1588:
1589: if ($r) {
1590: $r->print($result);
1591: $result = "";
1592: $r->rflush();
1593: }
1594:
1595: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1596:
1597: return $result;
1598: }
1599:
1600: 1;
1601:
1602: package Apache::lonnavmaps::navmap;
1603:
1604: =pod
1605:
1606: =head1 Object: Apache::lonnavmaps::navmap
1607:
1608: You must obtain resource objects through the navmap object.
1609:
1610: =head2 Creation
1611:
1612: =over 4
1613:
1614: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1615: genMailDiscussStatus, getUserData):
1616:
1617: Binds a new navmap object to the compiled nav map hash and parm hash
1618: given as filenames. genCourseAndUserOptions is a flag saying whether
1619: the course options and user options hash should be generated. This is
1620: for when you are using the parameters of the resources that require
1621: them; see documentation in resource object
1622: documentation. genMailDiscussStatus causes the nav map to retreive
1623: information about the email and discussion status of
1624: resources. Returns the navmap object if this is successful, or
1625: B<undef> if not. You must check for undef; errors will occur when you
1626: try to use the other methods otherwise. getUserData, if true, will
1627: retreive the user's performance data for various problems.
1628:
1629: =back
1630:
1631: =head2 Methods
1632:
1633: =over 4
1634:
1635: =item * B<getIterator>(first, finish, filter, condition):
1636:
1637: See iterator documentation below.
1638:
1639: =cut
1640:
1641: use strict;
1642: use GDBM_File;
1643:
1644: sub new {
1645: # magic invocation to create a class instance
1646: my $proto = shift;
1647: my $class = ref($proto) || $proto;
1648: my $self = {};
1649:
1650: $self->{NAV_HASH_FILE} = shift;
1651: $self->{PARM_HASH_FILE} = shift;
1652: $self->{GENERATE_COURSE_USER_OPT} = shift;
1653: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1654: $self->{GET_USER_DATA} = shift;
1655:
1656: # Resource cache stores navmap resources as we reference them. We generate
1657: # them on-demand so we don't pay for creating resources unless we use them.
1658: $self->{RESOURCE_CACHE} = {};
1659:
1660: # Network failure flag, if we accessed the course or user opt and
1661: # failed
1662: $self->{NETWORK_FAILURE} = 0;
1663:
1664: # tie the nav hash
1665:
1666: my %navmaphash;
1667: my %parmhash;
1668: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1669: &GDBM_READER(), 0640))) {
1670: return undef;
1671: }
1672:
1673: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1674: &GDBM_READER(), 0640)))
1675: {
1676: untie %{$self->{PARM_HASH}};
1677: return undef;
1678: }
1679:
1680: $self->{NAV_HASH} = \%navmaphash;
1681: $self->{PARM_HASH} = \%parmhash;
1682: $self->{INITED} = 0;
1683:
1684: bless($self);
1685:
1686: return $self;
1687: }
1688:
1689: sub init {
1690: my $self = shift;
1691: if ($self->{INITED}) { return; }
1692:
1693: # If the course opt hash and the user opt hash should be generated,
1694: # generate them
1695: if ($self->{GENERATE_COURSE_USER_OPT}) {
1696: my $uname=$ENV{'user.name'};
1697: my $udom=$ENV{'user.domain'};
1698: my $uhome=$ENV{'user.home'};
1699: my $cid=$ENV{'request.course.id'};
1700: my $chome=$ENV{'course.'.$cid.'.home'};
1701: my ($cdom,$cnum)=split(/\_/,$cid);
1702:
1703: my $userprefix=$uname.'_'.$udom.'_';
1704:
1705: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1706: unless ($uhome eq 'no_host') {
1707: # ------------------------------------------------- Get coursedata (if present)
1708: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1709: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1710: ':resourcedata',$chome);
1711: # Check for network failure
1712: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1713: $self->{NETWORK_FAILURE} = 1;
1714: } elsif ($reply!~/^error\:/) {
1715: $courserdatas{$cid}=$reply;
1716: $courserdatas{$cid.'.last_cache'}=time;
1717: }
1718: }
1719: foreach (split(/\&/,$courserdatas{$cid})) {
1720: my ($name,$value)=split(/\=/,$_);
1721: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1722: &Apache::lonnet::unescape($value);
1723: }
1724: # --------------------------------------------------- Get userdata (if present)
1725: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1726: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1727: if ($reply!~/^error\:/) {
1728: $userrdatas{$uname.'___'.$udom}=$reply;
1729: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1730: }
1731: # check to see if network failed
1732: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1733: {
1734: $self->{NETWORK_FAILURE} = 1;
1735: }
1736: }
1737: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1738: my ($name,$value)=split(/\=/,$_);
1739: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1740: &Apache::lonnet::unescape($value);
1741: }
1742: $self->{COURSE_OPT} = \%courseopt;
1743: $self->{USER_OPT} = \%useropt;
1744: }
1745: }
1746:
1747: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1748: my $cid=$ENV{'request.course.id'};
1749: my ($cdom,$cnum)=split(/\_/,$cid);
1750:
1751: my %emailstatus = &Apache::lonnet::dump('email_status');
1752: my $logoutTime = $emailstatus{'logout'};
1753: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1754: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1755: $courseLeaveTime : $logoutTime);
1756: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1757: $cdom, $cnum);
1758: my %feedback=();
1759: my %error=();
1760: my $keys = &Apache::lonnet::reply('keys:'.
1761: $ENV{'user.domain'}.':'.
1762: $ENV{'user.name'}.':nohist_email',
1763: $ENV{'user.home'});
1764:
1765: foreach my $msgid (split(/\&/, $keys)) {
1766: $msgid=&Apache::lonnet::unescape($msgid);
1767: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1768: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1769: my ($what,$url)=($1,$2);
1770: my %status=
1771: &Apache::lonnet::get('email_status',[$msgid]);
1772: if ($status{$msgid}=~/^error\:/) {
1773: $status{$msgid}='';
1774: }
1775:
1776: if (($status{$msgid} eq 'new') ||
1777: (!$status{$msgid})) {
1778: if ($what eq 'Error') {
1779: $error{$url}.=','.$msgid;
1780: } else {
1781: $feedback{$url}.=','.$msgid;
1782: }
1783: }
1784: }
1785: }
1786:
1787: $self->{FEEDBACK} = \%feedback;
1788: $self->{ERROR_MSG} = \%error; # what is this? JB
1789: $self->{DISCUSSION_TIME} = \%discussiontime;
1790: $self->{EMAIL_STATUS} = \%emailstatus;
1791:
1792: }
1793:
1794: if ($self->{GET_USER_DATA}) {
1795: # Retreive performance data on problems
1796: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1797: $ENV{'user.domain'},
1798: $ENV{'user.name'});
1799: $self->{STUDENT_DATA} = \%student_data;
1800: }
1801:
1802: $self->{PARM_CACHE} = {};
1803: $self->{INITED} = 1;
1804: }
1805:
1806: # Internal function: Takes a key to look up in the nav hash and implements internal
1807: # memory caching of that key.
1808: sub navhash {
1809: my $self = shift; my $key = shift;
1810: return $self->{NAV_HASH}->{$key};
1811: }
1812:
1813: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1814: sub courseMapDefined {
1815: my $self = shift;
1816: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1817:
1818: my $firstres = $self->navhash("map_start_$uri");
1819: my $lastres = $self->navhash("map_finish_$uri");
1820: return $firstres && $lastres;
1821: }
1822:
1823: sub getIterator {
1824: my $self = shift;
1825: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1826: shift, undef, shift);
1827: return $iterator;
1828: }
1829:
1830: # unties the hash when done
1831: sub untieHashes {
1832: my $self = shift;
1833: untie %{$self->{NAV_HASH}};
1834: untie %{$self->{PARM_HASH}};
1835: }
1836:
1837: # Private method: Does the given resource (as a symb string) have
1838: # current discussion? Returns 0 if chat/mail data not extracted.
1839: sub hasDiscussion {
1840: my $self = shift;
1841: my $symb = shift;
1842: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1843:
1844: #return defined($self->{DISCUSSION_TIME}->{$symb});
1845: return $self->{DISCUSSION_TIME}->{$symb} >
1846: $self->{LAST_CHECK};
1847: }
1848:
1849: # Private method: Does the given resource (as a symb string) have
1850: # current feedback? Returns the string in the feedback hash, which
1851: # will be false if it does not exist.
1852: sub getFeedback {
1853: my $self = shift;
1854: my $symb = shift;
1855:
1856: if (!defined($self->{FEEDBACK})) { return ""; }
1857:
1858: return $self->{FEEDBACK}->{$symb};
1859: }
1860:
1861: # Private method: Get the errors for that resource (by source).
1862: sub getErrors {
1863: my $self = shift;
1864: my $src = shift;
1865:
1866: if (!defined($self->{ERROR_MSG})) { return ""; }
1867: return $self->{ERROR_MSG}->{$src};
1868: }
1869:
1870: =pod
1871:
1872: =item * B<getById>(id):
1873:
1874: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1875: object for that resource. This method, or other methods that use it
1876: (as in the resource object) is the only proper way to obtain a
1877: resource object.
1878:
1879: =item * B<getBySymb>(symb):
1880:
1881: Based on the symb of the resource, get a resource object for that
1882: resource. This is one of the proper ways to get a resource object.
1883:
1884: =item * B<getMapByMapPc>(map_pc):
1885:
1886: Based on the map_pc of the resource, get a resource object for
1887: the given map. This is one of the proper ways to get a resource object.
1888:
1889: =cut
1890:
1891: # The strategy here is to cache the resource objects, and only construct them
1892: # as we use them. The real point is to prevent reading any more from the tied
1893: # hash then we have to, which should hopefully alleviate speed problems.
1894: # Caching is just an incidental detail I throw in because it makes sense.
1895:
1896: sub getById {
1897: my $self = shift;
1898: my $id = shift;
1899:
1900: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1901: {
1902: return $self->{RESOURCE_CACHE}->{$id};
1903: }
1904:
1905: # resource handles inserting itself into cache.
1906: # Not clear why the quotes are necessary, but as of this
1907: # writing it doesn't work without them.
1908: return "Apache::lonnavmaps::resource"->new($self, $id);
1909: }
1910:
1911: sub getBySymb {
1912: my $self = shift;
1913: my $symb = shift;
1914: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1915: my $map = $self->getResourceByUrl($mapUrl);
1916: return $self->getById($map->map_pc() . '.' . $id);
1917: }
1918:
1919: sub getByMapPc {
1920: my $self = shift;
1921: my $map_pc = shift;
1922: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1923: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1924: return $self->getById($map_id);
1925: }
1926:
1927: =pod
1928:
1929: =item * B<firstResource>():
1930:
1931: Returns a resource object reference corresponding to the first
1932: resource in the navmap.
1933:
1934: =cut
1935:
1936: sub firstResource {
1937: my $self = shift;
1938: my $firstResource = $self->navhash('map_start_' .
1939: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1940: return $self->getById($firstResource);
1941: }
1942:
1943: =pod
1944:
1945: =item * B<finishResource>():
1946:
1947: Returns a resource object reference corresponding to the last resource
1948: in the navmap.
1949:
1950: =cut
1951:
1952: sub finishResource {
1953: my $self = shift;
1954: my $firstResource = $self->navhash('map_finish_' .
1955: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1956: return $self->getById($firstResource);
1957: }
1958:
1959: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1960: # the actual lookup; parmval caches the results.
1961: sub parmval {
1962: my $self = shift;
1963: my ($what,$symb)=@_;
1964: my $hashkey = $what."|||".$symb;
1965:
1966: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1967: return $self->{PARM_CACHE}->{$hashkey};
1968: }
1969:
1970: my $result = $self->parmval_real($what, $symb);
1971: $self->{PARM_CACHE}->{$hashkey} = $result;
1972: return $result;
1973: }
1974:
1975: sub parmval_real {
1976: my $self = shift;
1977: my ($what,$symb) = @_;
1978:
1979: my $cid=$ENV{'request.course.id'};
1980: my $csec=$ENV{'request.course.sec'};
1981: my $uname=$ENV{'user.name'};
1982: my $udom=$ENV{'user.domain'};
1983:
1984: unless ($symb) { return ''; }
1985: my $result='';
1986:
1987: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1988:
1989: # ----------------------------------------------------- Cascading lookup scheme
1990: my $rwhat=$what;
1991: $what=~s/^parameter\_//;
1992: $what=~s/\_/\./;
1993:
1994: my $symbparm=$symb.'.'.$what;
1995: my $mapparm=$mapname.'___(all).'.$what;
1996: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1997:
1998: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1999: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2000: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2001:
2002: my $courselevel= $usercourseprefix.'.'.$what;
2003: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2004: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2005:
2006: my $useropt = $self->{USER_OPT};
2007: my $courseopt = $self->{COURSE_OPT};
2008: my $parmhash = $self->{PARM_HASH};
2009:
2010: # ---------------------------------------------------------- first, check user
2011: if ($uname and defined($useropt)) {
2012: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2013: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2014: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2015: }
2016:
2017: # ------------------------------------------------------- second, check course
2018: if ($csec and defined($courseopt)) {
2019: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2020: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2021: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2022: }
2023:
2024: if (defined($courseopt)) {
2025: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2026: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2027: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2028: }
2029:
2030: # ----------------------------------------------------- third, check map parms
2031:
2032: my $thisparm=$$parmhash{$symbparm};
2033: if (defined($thisparm)) { return $thisparm; }
2034:
2035: # ----------------------------------------------------- fourth , check default
2036:
2037: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
2038: if (defined($default)) { return $default}
2039:
2040: # --------------------------------------------------- fifth , cascade up parts
2041:
2042: my ($space,@qualifier)=split(/\./,$rwhat);
2043: my $qualifier=join('.',@qualifier);
2044: unless ($space eq '0') {
2045: my @parts=split(/_/,$space);
2046: my $id=pop(@parts);
2047: my $part=join('_',@parts);
2048: if ($part eq '') { $part='0'; }
2049: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
2050: if (defined($partgeneral)) { return $partgeneral; }
2051: }
2052: return '';
2053: }
2054:
2055: =pod
2056:
2057: =item * B<getResourceByUrl>(url):
2058:
2059: Retrieves a resource object by URL of the resource. If passed a
2060: resource object, it will simply return it, so it is safe to use this
2061: method in code like "$res = $navmap->getResourceByUrl($res)", if
2062: you're not sure if $res is already an object, or just a URL. If the
2063: resource appears multiple times in the course, only the first instance
2064: will be returned. As a result, this is probably useful only for maps.
2065:
2066: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2067:
2068: The map is a specification of a map to retreive the resources from,
2069: either as a url or as an object. The filterFunc is a reference to a
2070: function that takes a resource object as its one argument and returns
2071: true if the resource should be included, or false if it should not
2072: be. If recursive is true, the map will be recursively examined,
2073: otherwise it will not be. If bailout is true, the function will return
2074: as soon as it finds a resource, if false it will finish. By default,
2075: the map is the top-level map of the course, filterFunc is a function
2076: that always returns 1, recursive is true, bailout is false. The
2077: resources will be returned in a list containing the resource objects
2078: for the corresponding resources, with B<no structure information> in
2079: the list; regardless of branching, recursion, etc., it will be a flat
2080: list.
2081:
2082: Thus, this is suitable for cases where you don't want the structure,
2083: just a list of all resources. It is also suitable for finding out how
2084: many resources match a given description; for this use, if all you
2085: want to know is if I<any> resources match the description, the bailout
2086: parameter will allow you to avoid potentially expensive enumeration of
2087: all matching resources.
2088:
2089: =item * B<hasResources>(map, filterFunc, recursive):
2090:
2091: Convience method for
2092:
2093: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2094:
2095: which will tell whether the map has resources matching the description
2096: in the filter function.
2097:
2098: =cut
2099:
2100: sub getResourceByUrl {
2101: my $self = shift;
2102: my $resUrl = shift;
2103:
2104: if (ref($resUrl)) { return $resUrl; }
2105:
2106: $resUrl = &Apache::lonnet::clutter($resUrl);
2107: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2108: if ($resId =~ /,/) {
2109: $resId = (split (/,/, $resId))[0];
2110: }
2111: if (!$resId) { return ''; }
2112: return $self->getById($resId);
2113: }
2114:
2115: sub retrieveResources {
2116: my $self = shift;
2117: my $map = shift;
2118: my $filterFunc = shift;
2119: if (!defined ($filterFunc)) {
2120: $filterFunc = sub {return 1;};
2121: }
2122: my $recursive = shift;
2123: if (!defined($recursive)) { $recursive = 1; }
2124: my $bailout = shift;
2125: if (!defined($bailout)) { $bailout = 0; }
2126:
2127: # Create the necessary iterator.
2128: if (!ref($map)) { # assume it's a url of a map.
2129: $map = $self->getResourceByUrl($map);
2130: }
2131:
2132: # If nothing was passed, assume top-level map
2133: if (!$map) {
2134: $map = $self->getById('0.0');
2135: }
2136:
2137: # Check the map's validity.
2138: if (!$map->is_map()) {
2139: # Oh, to throw an exception.... how I'd love that!
2140: return ();
2141: }
2142:
2143: # Get an iterator.
2144: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2145: undef, $recursive);
2146:
2147: my @resources = ();
2148:
2149: # Run down the iterator and collect the resources.
2150: my $depth = 1;
2151: $it->next();
2152: my $curRes = $it->next();
2153:
2154: while ($depth > 0) {
2155: if ($curRes == $it->BEGIN_MAP()) {
2156: $depth++;
2157: }
2158: if ($curRes == $it->END_MAP()) {
2159: $depth--;
2160: }
2161:
2162: if (ref($curRes)) {
2163: if (!&$filterFunc($curRes)) {
2164: next;
2165: }
2166:
2167: push @resources, $curRes;
2168:
2169: if ($bailout) {
2170: return @resources;
2171: }
2172: }
2173:
2174: } continue {
2175: $curRes = $it->next();
2176: }
2177:
2178: return @resources;
2179: }
2180:
2181: sub hasResource {
2182: my $self = shift;
2183: my $map = shift;
2184: my $filterFunc = shift;
2185: my $recursive = shift;
2186:
2187: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2188: }
2189:
2190: 1;
2191:
2192: package Apache::lonnavmaps::iterator;
2193:
2194: =pod
2195:
2196: =back
2197:
2198: =head1 Object: navmap Iterator
2199:
2200: An I<iterator> encapsulates the logic required to traverse a data
2201: structure. navmap uses an iterator to traverse the course map
2202: according to the criteria you wish to use.
2203:
2204: To obtain an iterator, call the B<getIterator>() function of a
2205: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2206: directly.) This will return a reference to the iterator:
2207:
2208: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2209:
2210: To get the next thing from the iterator, call B<next>:
2211:
2212: C<my $nextThing = $resourceIterator-E<gt>next()>
2213:
2214: getIterator behaves as follows:
2215:
2216: =over 4
2217:
2218: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2219:
2220: All parameters are optional. firstResource is a resource reference
2221: corresponding to where the iterator should start. It defaults to
2222: navmap->firstResource() for the corresponding nav map. finishResource
2223: corresponds to where you want the iterator to end, defaulting to
2224: navmap->finishResource(). filterHash is a hash used as a set
2225: containing strings representing the resource IDs, defaulting to
2226: empty. Condition is a 1 or 0 that sets what to do with the filter
2227: hash: If a 0, then only resources that exist IN the filterHash will be
2228: recursed on. If it is a 1, only resources NOT in the filterHash will
2229: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2230: false (default), the iterator will only return the first level of map
2231: that is not just a single, 'redirecting' map. If true, the iterator
2232: will return all information, starting with the top-level map,
2233: regardless of content. returnTopMap, if true (default false), will
2234: cause the iterator to return the top-level map object (resource 0.0)
2235: before anything else.
2236:
2237: Thus, by default, only top-level resources will be shown. Change the
2238: condition to a 1 without changing the hash, and all resources will be
2239: shown. Changing the condition to 1 and including some values in the
2240: hash will allow you to selectively suppress parts of the navmap, while
2241: leaving it on 0 and adding things to the hash will allow you to
2242: selectively add parts of the nav map. See the handler code for
2243: examples.
2244:
2245: The iterator will return either a reference to a resource object, or a
2246: token representing something in the map, such as the beginning of a
2247: new branch. The possible tokens are:
2248:
2249: =over 4
2250:
2251: =item * BEGIN_MAP:
2252:
2253: A new map is being recursed into. This is returned I<after> the map
2254: resource itself is returned.
2255:
2256: =item * END_MAP:
2257:
2258: The map is now done.
2259:
2260: =item * BEGIN_BRANCH:
2261:
2262: A branch is now starting. The next resource returned will be the first
2263: in that branch.
2264:
2265: =item * END_BRANCH:
2266:
2267: The branch is now done.
2268:
2269: =back
2270:
2271: The tokens are retreivable via methods on the iterator object, i.e.,
2272: $iterator->END_MAP.
2273:
2274: Maps can contain empty resources. The iterator will automatically skip
2275: over such resources, but will still treat the structure
2276: correctly. Thus, a complicated map with several branches, but
2277: consisting entirely of empty resources except for one beginning or
2278: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2279: but only one resource will be returned.
2280:
2281: =back
2282:
2283: =cut
2284:
2285: # Here are the tokens for the iterator:
2286:
2287: sub BEGIN_MAP { return 1; } # begining of a new map
2288: sub END_MAP { return 2; } # end of the map
2289: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2290: sub END_BRANCH { return 4; } # end of a branch
2291: sub FORWARD { return 1; } # go forward
2292: sub BACKWARD { return 2; }
2293:
2294: sub min {
2295: (my $a, my $b) = @_;
2296: if ($a < $b) { return $a; } else { return $b; }
2297: }
2298:
2299: sub new {
2300: # magic invocation to create a class instance
2301: my $proto = shift;
2302: my $class = ref($proto) || $proto;
2303: my $self = {};
2304:
2305: $self->{NAV_MAP} = shift;
2306: return undef unless ($self->{NAV_MAP});
2307:
2308: # Handle the parameters
2309: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2310: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2311:
2312: # If the given resources are just the ID of the resource, get the
2313: # objects
2314: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2315: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2316: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2317: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2318:
2319: $self->{FILTER} = shift;
2320:
2321: # A hash, used as a set, of resource already seen
2322: $self->{ALREADY_SEEN} = shift;
2323: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2324: $self->{CONDITION} = shift;
2325:
2326: # Do we want to automatically follow "redirection" maps?
2327: $self->{FORCE_TOP} = shift;
2328:
2329: # Do we want to return the top-level map object (resource 0.0)?
2330: $self->{RETURN_0} = shift;
2331: # have we done that yet?
2332: $self->{HAVE_RETURNED_0} = 0;
2333:
2334: # Now, we need to pre-process the map, by walking forward and backward
2335: # over the parts of the map we're going to look at.
2336:
2337: # The processing steps are exactly the same, except for a few small
2338: # changes, so I bundle those up in the following list of two elements:
2339: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2340: # first_resource).
2341: # This prevents writing nearly-identical code twice.
2342: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2343: 'FIRST_RESOURCE'],
2344: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2345: 'FINISH_RESOURCE'] );
2346:
2347: my $maxDepth = 0; # tracks max depth
2348:
2349: # If there is only one resource in this map, and it's a map, we
2350: # want to remember that, so the user can ask for the first map
2351: # that isn't just a redirector.
2352: my $resource; my $resourceCount = 0;
2353:
2354: # Documentation on this algorithm can be found in the CVS repository at
2355: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2356: # in that file.
2357: # **1**
2358:
2359: foreach my $pass (@iterations) {
2360: my $direction = $pass->[0];
2361: my $valName = $pass->[1];
2362: my $nextResourceMethod = $pass->[2];
2363: my $firstResourceName = $pass->[3];
2364:
2365: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2366: $self->{FIRST_RESOURCE},
2367: $self->{FINISH_RESOURCE},
2368: {}, undef, 0, $direction);
2369:
2370: # prime the recursion
2371: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2372: my $depth = 0;
2373: $iterator->next();
2374: my $curRes = $iterator->next();
2375: while ($depth > -1) {
2376: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2377: if ($curRes == $iterator->END_MAP()) { $depth--; }
2378:
2379: if (ref($curRes)) {
2380: # If there's only one resource, this will save it
2381: # we have to filter empty resources from consideration here,
2382: # or even "empty", redirecting maps have two (start & finish)
2383: # or three (start, finish, plus redirector)
2384: if($direction == FORWARD && $curRes->src()) {
2385: $resource = $curRes; $resourceCount++;
2386: }
2387: my $resultingVal = $curRes->{DATA}->{$valName};
2388: my $nextResources = $curRes->$nextResourceMethod();
2389: my $nextCount = scalar(@{$nextResources});
2390:
2391: if ($nextCount == 1) { # **3**
2392: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2393: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2394: }
2395:
2396: if ($nextCount > 1) { # **4**
2397: foreach my $res (@{$nextResources}) {
2398: my $current = $res->{DATA}->{$valName} || 999999999;
2399: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2400: }
2401: }
2402: }
2403:
2404: # Assign the final val (**2**)
2405: if (ref($curRes) && $direction == BACKWARD()) {
2406: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2407: $curRes->{DATA}->{BOT_UP_VAL});
2408:
2409: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2410: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2411: }
2412: } continue {
2413: $curRes = $iterator->next();
2414: }
2415: }
2416:
2417: # Check: Was this only one resource, a map?
2418: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2419: my $firstResource = $resource->map_start();
2420: my $finishResource = $resource->map_finish();
2421: return
2422: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2423: $finishResource, $self->{FILTER},
2424: $self->{ALREADY_SEEN},
2425: $self->{CONDITION}, 0);
2426:
2427: }
2428:
2429: # Set up some bookkeeping information.
2430: $self->{CURRENT_DEPTH} = 0;
2431: $self->{MAX_DEPTH} = $maxDepth;
2432: $self->{STACK} = [];
2433: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2434:
2435: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2436: push @{$self->{STACK}}, [];
2437: }
2438:
2439: # Prime the recursion w/ the first resource **5**
2440: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2441: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2442:
2443: bless ($self);
2444:
2445: return $self;
2446: }
2447:
2448: sub next {
2449: my $self = shift;
2450:
2451: # If we want to return the top-level map object, and haven't yet,
2452: # do so.
2453: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2454: $self->{HAVE_RETURNED_0} = 1;
2455: return $self->{NAV_MAP}->getById('0.0');
2456: }
2457:
2458: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2459: # grab the next from the recursive iterator
2460: my $next = $self->{RECURSIVE_ITERATOR}->next();
2461:
2462: # is it a begin or end map? If so, update the depth
2463: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2464: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2465:
2466: # Are we back at depth 0? If so, stop recursing
2467: if ($self->{RECURSIVE_DEPTH} == 0) {
2468: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2469: }
2470:
2471: return $next;
2472: }
2473:
2474: if (defined($self->{FORCE_NEXT})) {
2475: my $tmp = $self->{FORCE_NEXT};
2476: $self->{FORCE_NEXT} = undef;
2477: return $tmp;
2478: }
2479:
2480: # Have we not yet begun? If not, return BEGIN_MAP and
2481: # remember we've started.
2482: if ( !$self->{STARTED} ) {
2483: $self->{STARTED} = 1;
2484: return $self->BEGIN_MAP();
2485: }
2486:
2487: # Here's the guts of the iterator.
2488:
2489: # Find the next resource, if any.
2490: my $found = 0;
2491: my $i = $self->{MAX_DEPTH};
2492: my $newDepth;
2493: my $here;
2494: while ( $i >= 0 && !$found ) {
2495: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2496: $here = pop @{$self->{STACK}->[$i]}; # **7**
2497: $found = 1;
2498: $newDepth = $i;
2499: }
2500: $i--;
2501: }
2502:
2503: # If we still didn't find anything, we're done.
2504: if ( !$found ) {
2505: # We need to get back down to the correct branch depth
2506: if ( $self->{CURRENT_DEPTH} > 0 ) {
2507: $self->{CURRENT_DEPTH}--;
2508: return END_BRANCH();
2509: } else {
2510: return END_MAP();
2511: }
2512: }
2513:
2514: # If this is not a resource, it must be an END_BRANCH marker we want
2515: # to return directly.
2516: if (!ref($here)) { # **8**
2517: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2518: $self->{CURRENT_DEPTH}--;
2519: return $here;
2520: }
2521: }
2522:
2523: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2524: $self->{HERE} = $here;
2525:
2526: # Get to the right level
2527: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2528: push @{$self->{STACK}->[$newDepth]}, $here;
2529: $self->{CURRENT_DEPTH}--;
2530: return END_BRANCH();
2531: }
2532: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2533: push @{$self->{STACK}->[$newDepth]}, $here;
2534: $self->{CURRENT_DEPTH}++;
2535: return BEGIN_BRANCH();
2536: }
2537:
2538: # If we made it here, we have the next resource, and we're at the
2539: # right branch level. So let's examine the resource for where
2540: # we can get to from here.
2541:
2542: # So we need to look at all the resources we can get to from here,
2543: # categorize them if we haven't seen them, remember if we have a new
2544: my $nextUnfiltered = $here->getNext();
2545: my $maxDepthAdded = -1;
2546:
2547: for (@$nextUnfiltered) {
2548: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2549: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2550: push @{$self->{STACK}->[$depth]}, $_;
2551: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2552: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2553: }
2554: }
2555:
2556: # Is this the end of a branch? If so, all of the resources examined above
2557: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2558: # marker onto the stack so we don't forget.
2559: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2560: # BC branch and gets to C, it will see F as the only next resource, but it's
2561: # one level lower. Thus, this is the end of the branch, since there are no
2562: # more resources added to this level or above.
2563: # We don't do this if the examined resource is the finish resource,
2564: # because the condition given above is true, but the "END_MAP" will
2565: # take care of things and we should already be at depth 0.
2566: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2567: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2568: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2569: }
2570:
2571: # That ends the main iterator logic. Now, do we want to recurse
2572: # down this map (if this resource is a map)?
2573: if ($self->{HERE}->is_map() &&
2574: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2575: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2576: my $firstResource = $self->{HERE}->map_start();
2577: my $finishResource = $self->{HERE}->map_finish();
2578:
2579: $self->{RECURSIVE_ITERATOR} =
2580: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2581: $finishResource, $self->{FILTER},
2582: $self->{ALREADY_SEEN}, $self->{CONDITION});
2583: }
2584:
2585: # If this is a blank resource, don't actually return it.
2586: # Should you ever find you need it, make sure to add an option to the code
2587: # that you can use; other things depend on this behavior.
2588: my $browsePriv = $self->{HERE}->browsePriv();
2589: if (!$self->{HERE}->src() ||
2590: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2591: return $self->next();
2592: }
2593:
2594: return $self->{HERE};
2595:
2596: }
2597:
2598: =pod
2599:
2600: The other method available on the iterator is B<getStack>, which
2601: returns an array populated with the current 'stack' of maps, as
2602: references to the resource objects. Example: This is useful when
2603: making the navigation map, as we need to check whether we are under a
2604: page map to see if we need to link directly to the resource, or to the
2605: page. The first elements in the array will correspond to the top of
2606: the stack (most inclusive map).
2607:
2608: =cut
2609:
2610: sub getStack {
2611: my $self=shift;
2612:
2613: my @stack;
2614:
2615: $self->populateStack(\@stack);
2616:
2617: return \@stack;
2618: }
2619:
2620: # Private method: Calls the iterators recursively to populate the stack.
2621: sub populateStack {
2622: my $self=shift;
2623: my $stack = shift;
2624:
2625: push @$stack, $self->{HERE} if ($self->{HERE});
2626:
2627: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2628: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2629: }
2630: }
2631:
2632: 1;
2633:
2634: package Apache::lonnavmaps::DFSiterator;
2635:
2636: # Not documented in the perldoc: This is a simple iterator that just walks
2637: # through the nav map and presents the resources in a depth-first search
2638: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2639: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2640: # useful for pre-processing of some kind, and is in fact used by the main
2641: # iterator that way, but that's about it.
2642: # One could imagine merging this into the init routine of the main iterator,
2643: # but this might as well be left seperate, since it is possible some other
2644: # use might be found for it. - Jeremy
2645:
2646: # Unlike the main iterator, this DOES return all resources, even blank ones.
2647: # The main iterator needs them to correctly preprocess the map.
2648:
2649: sub BEGIN_MAP { return 1; } # begining of a new map
2650: sub END_MAP { return 2; } # end of the map
2651: sub FORWARD { return 1; } # go forward
2652: sub BACKWARD { return 2; }
2653:
2654: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2655: # filter hash ref (or undef), already seen hash or undef, condition
2656: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2657: sub new {
2658: # magic invocation to create a class instance
2659: my $proto = shift;
2660: my $class = ref($proto) || $proto;
2661: my $self = {};
2662:
2663: $self->{NAV_MAP} = shift;
2664: return undef unless ($self->{NAV_MAP});
2665:
2666: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2667: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2668:
2669: # If the given resources are just the ID of the resource, get the
2670: # objects
2671: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2672: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2673: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2674: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2675:
2676: $self->{FILTER} = shift;
2677:
2678: # A hash, used as a set, of resource already seen
2679: $self->{ALREADY_SEEN} = shift;
2680: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2681: $self->{CONDITION} = shift;
2682: $self->{DIRECTION} = shift || FORWARD();
2683:
2684: # Flag: Have we started yet?
2685: $self->{STARTED} = 0;
2686:
2687: # Should we continue calling the recursive iterator, if any?
2688: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2689: # The recursive iterator, if any
2690: $self->{RECURSIVE_ITERATOR} = undef;
2691: # Are we recursing on a map, or a branch?
2692: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2693: # And the count of how deep it is, so that this iterator can keep track of
2694: # when to pick back up again.
2695: $self->{RECURSIVE_DEPTH} = 0;
2696:
2697: # For keeping track of our branches, we maintain our own stack
2698: $self->{STACK} = [];
2699:
2700: # Start with the first resource
2701: if ($self->{DIRECTION} == FORWARD) {
2702: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2703: } else {
2704: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2705: }
2706:
2707: bless($self);
2708: return $self;
2709: }
2710:
2711: sub next {
2712: my $self = shift;
2713:
2714: # Are we using a recursive iterator? If so, pull from that and
2715: # watch the depth; we want to resume our level at the correct time.
2716: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2717: # grab the next from the recursive iterator
2718: my $next = $self->{RECURSIVE_ITERATOR}->next();
2719:
2720: # is it a begin or end map? Update depth if so
2721: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2722: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2723:
2724: # Are we back at depth 0? If so, stop recursing.
2725: if ($self->{RECURSIVE_DEPTH} == 0) {
2726: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2727: }
2728:
2729: return $next;
2730: }
2731:
2732: # Is there a current resource to grab? If not, then return
2733: # END_MAP, which will end the iterator.
2734: if (scalar(@{$self->{STACK}}) == 0) {
2735: return $self->END_MAP();
2736: }
2737:
2738: # Have we not yet begun? If not, return BEGIN_MAP and
2739: # remember that we've started.
2740: if ( !$self->{STARTED} ) {
2741: $self->{STARTED} = 1;
2742: return $self->BEGIN_MAP;
2743: }
2744:
2745: # Get the next resource in the branch
2746: $self->{HERE} = pop @{$self->{STACK}};
2747:
2748: # remember that we've seen this, so we don't return it again later
2749: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2750:
2751: # Get the next possible resources
2752: my $nextUnfiltered;
2753: if ($self->{DIRECTION} == FORWARD()) {
2754: $nextUnfiltered = $self->{HERE}->getNext();
2755: } else {
2756: $nextUnfiltered = $self->{HERE}->getPrevious();
2757: }
2758: my $next = [];
2759:
2760: # filter the next possibilities to remove things we've
2761: # already seen.
2762: foreach (@$nextUnfiltered) {
2763: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2764: push @$next, $_;
2765: }
2766: }
2767:
2768: while (@$next) {
2769: # copy the next possibilities over to the stack
2770: push @{$self->{STACK}}, shift @$next;
2771: }
2772:
2773: # If this is a map and we want to recurse down it... (not filtered out)
2774: if ($self->{HERE}->is_map() &&
2775: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2776: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2777: my $firstResource = $self->{HERE}->map_start();
2778: my $finishResource = $self->{HERE}->map_finish();
2779:
2780: $self->{RECURSIVE_ITERATOR} =
2781: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2782: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2783: $self->{CONDITION}, $self->{DIRECTION});
2784: }
2785:
2786: return $self->{HERE};
2787: }
2788:
2789: # Identical to the full iterator methods of the same name. Hate to copy/paste
2790: # but I also hate to "inherit" either iterator from the other.
2791:
2792: sub getStack {
2793: my $self=shift;
2794:
2795: my @stack;
2796:
2797: $self->populateStack(\@stack);
2798:
2799: return \@stack;
2800: }
2801:
2802: # Private method: Calls the iterators recursively to populate the stack.
2803: sub populateStack {
2804: my $self=shift;
2805: my $stack = shift;
2806:
2807: push @$stack, $self->{HERE} if ($self->{HERE});
2808:
2809: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2810: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2811: }
2812: }
2813:
2814: 1;
2815:
2816: package Apache::lonnavmaps::resource;
2817:
2818: use Apache::lonnet;
2819:
2820: =pod
2821:
2822: =head1 Object: resource
2823:
2824: A resource object encapsulates a resource in a resource map, allowing
2825: easy manipulation of the resource, querying the properties of the
2826: resource (including user properties), and represents a reference that
2827: can be used as the canonical representation of the resource by
2828: lonnavmap clients like renderers.
2829:
2830: A resource only makes sense in the context of a navmap, as some of the
2831: data is stored in the navmap object.
2832:
2833: You will probably never need to instantiate this object directly. Use
2834: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2835: starting resource.
2836:
2837: Resource objects respect the parameter_hiddenparts, which suppresses
2838: various parts according to the wishes of the map author. As of this
2839: writing, there is no way to override this parameter, and suppressed
2840: parts will never be returned, nor will their response types or ids be
2841: stored.
2842:
2843: =head2 Public Members
2844:
2845: resource objects have a hash called DATA ($resourceRef->{DATA}) that
2846: you can store whatever you want in. This allows you to easily do
2847: two-pass algorithms without worrying about managing your own
2848: resource->data hash.
2849:
2850: =head2 Methods
2851:
2852: =over 4
2853:
2854: =item * B<new>($navmapRef, $idString):
2855:
2856: The first arg is a reference to the parent navmap object. The second
2857: is the idString of the resource itself. Very rarely, if ever, called
2858: directly. Use the nav map->getByID() method.
2859:
2860: =back
2861:
2862: =cut
2863:
2864: sub new {
2865: # magic invocation to create a class instance
2866: my $proto = shift;
2867: my $class = ref($proto) || $proto;
2868: my $self = {};
2869:
2870: $self->{NAV_MAP} = shift;
2871: $self->{ID} = shift;
2872:
2873: # Store this new resource in the parent nav map's cache.
2874: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
2875: $self->{RESOURCE_ERROR} = 0;
2876:
2877: # A hash that can be used by two-pass algorithms to store data
2878: # about this resource in. Not used by the resource object
2879: # directly.
2880: $self->{DATA} = {};
2881:
2882: bless($self);
2883:
2884: return $self;
2885: }
2886:
2887: # private function: simplify the NAV_HASH lookups we keep doing
2888: # pass the name, and to automatically append my ID, pass a true val on the
2889: # second param
2890: sub navHash {
2891: my $self = shift;
2892: my $param = shift;
2893: my $id = shift;
2894: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
2895: }
2896:
2897: =pod
2898:
2899: B<Metadata Retreival>
2900:
2901: These are methods that help you retrieve metadata about the resource:
2902: Method names are based on the fields in the compiled course
2903: representation.
2904:
2905: =over 4
2906:
2907: =item * B<compTitle>:
2908:
2909: Returns a "composite title", that is equal to $res->title() if the
2910: resource has a title, and is otherwise the last part of the URL (e.g.,
2911: "problem.problem").
2912:
2913: =item * B<ext>:
2914:
2915: Returns true if the resource is external.
2916:
2917: =item * B<goesto>:
2918:
2919: Returns the "goesto" value from the compiled nav map. (It is likely
2920: you want to use B<getNext> instead.)
2921:
2922: =item * B<kind>:
2923:
2924: Returns the kind of the resource from the compiled nav map.
2925:
2926: =item * B<randomout>:
2927:
2928: Returns true if this resource was chosen to NOT be shown to the user
2929: by the random map selection feature. In other words, this is usually
2930: false.
2931:
2932: =item * B<randompick>:
2933:
2934: Returns true for a map if the randompick feature is being used on the
2935: map. (?)
2936:
2937: =item * B<src>:
2938:
2939: Returns the source for the resource.
2940:
2941: =item * B<symb>:
2942:
2943: Returns the symb for the resource.
2944:
2945: =item * B<title>:
2946:
2947: Returns the title of the resource.
2948:
2949: =item * B<to>:
2950:
2951: Returns the "to" value from the compiled nav map. (It is likely you
2952: want to use B<getNext> instead.)
2953:
2954: =back
2955:
2956: =cut
2957:
2958: # These info functions can be used directly, as they don't return
2959: # resource information.
2960: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
2961: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
2962: sub from { my $self=shift; return $self->navHash("from_", 1); }
2963: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2964: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
2965: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2966: sub randompick {
2967: my $self = shift;
2968: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2969: '.0.parameter_randompick'};
2970: }
2971: sub src {
2972: my $self=shift;
2973: return $self->navHash("src_", 1);
2974: }
2975: sub symb {
2976: my $self=shift;
2977: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2978: my $symbSrc = &Apache::lonnet::declutter($self->src());
2979: return &Apache::lonnet::declutter(
2980: $self->navHash('map_id_'.$first))
2981: . '___' . $second . '___' . $symbSrc;
2982: }
2983: sub title {
2984: my $self=shift;
2985: if ($self->{ID} eq '0.0') {
2986: # If this is the top-level map, return the title of the course
2987: # since this map can not be titled otherwise.
2988: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
2989: }
2990: return $self->navHash("title_", 1); }
2991: sub to { my $self=shift; return $self->navHash("to_", 1); }
2992: sub compTitle {
2993: my $self = shift;
2994: my $title = $self->title();
2995: $title=~s/\&colon\;/\:/gs;
2996: if (!$title) {
2997: $title = $self->src();
2998: $title = substr($title, rindex($title, '/') + 1);
2999: }
3000: return $title;
3001: }
3002: =pod
3003:
3004: B<Predicate Testing the Resource>
3005:
3006: These methods are shortcuts to deciding if a given resource has a given property.
3007:
3008: =over 4
3009:
3010: =item * B<is_map>:
3011:
3012: Returns true if the resource is a map type.
3013:
3014: =item * B<is_problem>:
3015:
3016: Returns true if the resource is a problem type, false
3017: otherwise. (Looks at the extension on the src field; might need more
3018: to work correctly.)
3019:
3020: =item * B<is_page>:
3021:
3022: Returns true if the resource is a page.
3023:
3024: =item * B<is_sequence>:
3025:
3026: Returns true if the resource is a sequence.
3027:
3028: =back
3029:
3030: =cut
3031:
3032:
3033: sub is_html {
3034: my $self=shift;
3035: my $src = $self->src();
3036: return ($src =~ /html$/);
3037: }
3038: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3039: sub is_page {
3040: my $self=shift;
3041: my $src = $self->src();
3042: return $self->navHash("is_map_", 1) &&
3043: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3044: }
3045: sub is_problem {
3046: my $self=shift;
3047: my $src = $self->src();
3048: return ($src =~ /problem$/);
3049: }
3050: sub is_sequence {
3051: my $self=shift;
3052: my $src = $self->src();
3053: return $self->navHash("is_map_", 1) &&
3054: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3055: }
3056:
3057: # Private method: Shells out to the parmval in the nav map, handler parts.
3058: sub parmval {
3059: my $self = shift;
3060: my $what = shift;
3061: my $part = shift;
3062: if (!defined($part)) {
3063: $part = '0';
3064: }
3065: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3066: }
3067:
3068: =pod
3069:
3070: B<Map Methods>
3071:
3072: These methods are useful for getting information about the map
3073: properties of the resource, if the resource is a map (B<is_map>).
3074:
3075: =over 4
3076:
3077: =item * B<map_finish>:
3078:
3079: Returns a reference to a resource object corresponding to the finish
3080: resource of the map.
3081:
3082: =item * B<map_pc>:
3083:
3084: Returns the pc value of the map, which is the first number that
3085: appears in the resource ID of the resources in the map, and is the
3086: number that appears around the middle of the symbs of the resources in
3087: that map.
3088:
3089: =item * B<map_start>:
3090:
3091: Returns a reference to a resource object corresponding to the start
3092: resource of the map.
3093:
3094: =item * B<map_type>:
3095:
3096: Returns a string with the type of the map in it.
3097:
3098: =back
3099:
3100: =cut
3101:
3102: sub map_finish {
3103: my $self = shift;
3104: my $src = $self->src();
3105: $src = Apache::lonnet::clutter($src);
3106: my $res = $self->navHash("map_finish_$src", 0);
3107: $res = $self->{NAV_MAP}->getById($res);
3108: return $res;
3109: }
3110: sub map_pc {
3111: my $self = shift;
3112: my $src = $self->src();
3113: return $self->navHash("map_pc_$src", 0);
3114: }
3115: sub map_start {
3116: my $self = shift;
3117: my $src = $self->src();
3118: $src = Apache::lonnet::clutter($src);
3119: my $res = $self->navHash("map_start_$src", 0);
3120: $res = $self->{NAV_MAP}->getById($res);
3121: return $res;
3122: }
3123: sub map_type {
3124: my $self = shift;
3125: my $pc = $self->map_pc();
3126: return $self->navHash("map_type_$pc", 0);
3127: }
3128:
3129: #####
3130: # Property queries
3131: #####
3132:
3133: # These functions will be responsible for returning the CORRECT
3134: # VALUE for the parameter, no matter what. So while they may look
3135: # like direct calls to parmval, they can be more then that.
3136: # So, for instance, the duedate function should use the "duedatetype"
3137: # information, rather then the resource object user.
3138:
3139: =pod
3140:
3141: =head2 Resource Parameters
3142:
3143: In order to use the resource parameters correctly, the nav map must
3144: have been instantiated with genCourseAndUserOptions set to true, so
3145: the courseopt and useropt is read correctly. Then, you can call these
3146: functions to get the relevant parameters for the resource. Each
3147: function defaults to part "0", but can be directed to another part by
3148: passing the part as the parameter.
3149:
3150: These methods are responsible for getting the parameter correct, not
3151: merely reflecting the contents of the GDBM hashes. As we move towards
3152: dates relative to other dates, these methods should be updated to
3153: reflect that. (Then, anybody using these methods will not have to update
3154: their code.)
3155:
3156: =over 4
3157:
3158: =item * B<acc>:
3159:
3160: Get the Client IP/Name Access Control information.
3161:
3162: =item * B<answerdate>:
3163:
3164: Get the answer-reveal date for the problem.
3165:
3166: =item * B<awarded>:
3167:
3168: Gets the awarded value for the problem part. Requires genUserData set to
3169: true when the navmap object was created.
3170:
3171: =item * B<duedate>:
3172:
3173: Get the due date for the problem.
3174:
3175: =item * B<tries>:
3176:
3177: Get the number of tries the student has used on the problem.
3178:
3179: =item * B<maxtries>:
3180:
3181: Get the number of max tries allowed.
3182:
3183: =item * B<opendate>:
3184:
3185: Get the open date for the problem.
3186:
3187: =item * B<sig>:
3188:
3189: Get the significant figures setting.
3190:
3191: =item * B<tol>:
3192:
3193: Get the tolerance for the problem.
3194:
3195: =item * B<tries>:
3196:
3197: Get the number of tries the user has already used on the problem.
3198:
3199: =item * B<type>:
3200:
3201: Get the question type for the problem.
3202:
3203: =item * B<weight>:
3204:
3205: Get the weight for the problem.
3206:
3207: =back
3208:
3209: =cut
3210:
3211: sub acc {
3212: (my $self, my $part) = @_;
3213: return $self->parmval("acc", $part);
3214: }
3215: sub answerdate {
3216: (my $self, my $part) = @_;
3217: # Handle intervals
3218: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3219: return $self->duedate($part) +
3220: $self->parmval("answerdate", $part);
3221: }
3222: return $self->parmval("answerdate", $part);
3223: }
3224: sub awarded {
3225: my $self = shift; my $part = shift;
3226: if (!defined($part)) { $part = '0'; }
3227: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3228: }
3229: sub duedate {
3230: (my $self, my $part) = @_;
3231: return $self->parmval("duedate", $part);
3232: }
3233: sub maxtries {
3234: (my $self, my $part) = @_;
3235: return $self->parmval("maxtries", $part);
3236: }
3237: sub opendate {
3238: (my $self, my $part) = @_;
3239: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3240: return $self->duedate($part) -
3241: $self->parmval("opendate", $part);
3242: }
3243: return $self->parmval("opendate");
3244: }
3245: sub problemstatus {
3246: (my $self, my $part) = @_;
3247: return $self->parmval("problemstatus", $part);
3248: }
3249: sub sig {
3250: (my $self, my $part) = @_;
3251: return $self->parmval("sig", $part);
3252: }
3253: sub tol {
3254: (my $self, my $part) = @_;
3255: return $self->parmval("tol", $part);
3256: }
3257: sub tries {
3258: my $self = shift;
3259: my $tries = $self->queryRestoreHash('tries', shift);
3260: if (!defined($tries)) { return '0';}
3261: return $tries;
3262: }
3263: sub type {
3264: (my $self, my $part) = @_;
3265: return $self->parmval("type", $part);
3266: }
3267: sub weight {
3268: my $self = shift; my $part = shift;
3269: if (!defined($part)) { $part = '0'; }
3270: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3271: $self->symb(), $ENV{'user.domain'},
3272: $ENV{'user.name'},
3273: $ENV{'request.course.sec'});
3274:
3275: }
3276:
3277: # Multiple things need this
3278: sub getReturnHash {
3279: my $self = shift;
3280:
3281: if (!defined($self->{RETURN_HASH})) {
3282: my %tmpHash = &Apache::lonnet::restore($self->symb());
3283: $self->{RETURN_HASH} = \%tmpHash;
3284: }
3285: }
3286:
3287: ######
3288: # Status queries
3289: ######
3290:
3291: # These methods query the status of problems.
3292:
3293: # If we need to count parts, this function determines the number of
3294: # parts from the metadata. When called, it returns a reference to a list
3295: # of strings corresponding to the parts. (Thus, using it in a scalar context
3296: # tells you how many parts you have in the problem:
3297: # $partcount = scalar($resource->countParts());
3298: # Don't use $self->{PARTS} directly because you don't know if it's been
3299: # computed yet.
3300:
3301: =pod
3302:
3303: =head2 Resource misc
3304:
3305: Misc. functions for the resource.
3306:
3307: =over 4
3308:
3309: =item * B<hasDiscussion>:
3310:
3311: Returns a false value if there has been discussion since the user last
3312: logged in, true if there has. Always returns false if the discussion
3313: data was not extracted when the nav map was constructed.
3314:
3315: =item * B<getFeedback>:
3316:
3317: Gets the feedback for the resource and returns the raw feedback string
3318: for the resource, or the null string if there is no feedback or the
3319: email data was not extracted when the nav map was constructed. Usually
3320: used like this:
3321:
3322: for (split(/\,/, $res->getFeedback())) {
3323: my $link = &Apache::lonnet::escape($_);
3324: ...
3325:
3326: and use the link as appropriate.
3327:
3328: =cut
3329:
3330: sub hasDiscussion {
3331: my $self = shift;
3332: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3333: }
3334:
3335: sub getFeedback {
3336: my $self = shift;
3337: my $source = $self->src();
3338: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3339: return $self->{NAV_MAP}->getFeedback($source);
3340: }
3341:
3342: sub getErrors {
3343: my $self = shift;
3344: my $source = $self->src();
3345: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3346: return $self->{NAV_MAP}->getErrors($source);
3347: }
3348:
3349: =pod
3350:
3351: =item * B<parts>():
3352:
3353: Returns a list reference containing sorted strings corresponding to
3354: each part of the problem. Single part problems have only a part '0'.
3355: Multipart problems do not return their part '0', since they typically
3356: do not really matter.
3357:
3358: =item * B<countParts>():
3359:
3360: Returns the number of parts of the problem a student can answer. Thus,
3361: for single part problems, returns 1. For multipart, it returns the
3362: number of parts in the problem, not including psuedo-part 0.
3363:
3364: =item * B<multipart>():
3365:
3366: Returns true if the problem is multipart, false otherwise. Use this instead
3367: of countParts if all you want is multipart/not multipart.
3368:
3369: =item * B<responseType>($part):
3370:
3371: Returns the response type of the part, without the word "response" on the
3372: end. Example return values: 'string', 'essay', 'numeric', etc.
3373:
3374: =item * B<responseIds>($part):
3375:
3376: Retreives the response IDs for the given part as an array reference containing
3377: strings naming the response IDs. This may be empty.
3378:
3379: =back
3380:
3381: =cut
3382:
3383: sub parts {
3384: my $self = shift;
3385:
3386: if ($self->ext) { return []; }
3387:
3388: $self->extractParts();
3389: return $self->{PARTS};
3390: }
3391:
3392: sub countParts {
3393: my $self = shift;
3394:
3395: my $parts = $self->parts();
3396:
3397: # If I left this here, then it's not necessary.
3398: #my $delta = 0;
3399: #for my $part (@$parts) {
3400: # if ($part eq '0') { $delta--; }
3401: #}
3402:
3403: if ($self->{RESOURCE_ERROR}) {
3404: return 0;
3405: }
3406:
3407: return scalar(@{$parts}); # + $delta;
3408: }
3409:
3410: sub multipart {
3411: my $self = shift;
3412: return $self->countParts() > 1;
3413: }
3414:
3415: sub responseType {
3416: my $self = shift;
3417: my $part = shift;
3418:
3419: $self->extractParts();
3420: return $self->{RESPONSE_TYPES}->{$part};
3421: }
3422:
3423: sub responseIds {
3424: my $self = shift;
3425: my $part = shift;
3426:
3427: $self->extractParts();
3428: return $self->{RESPONSE_IDS}->{$part};
3429: }
3430:
3431: # Private function: Extracts the parts information, both part names and
3432: # part types, and saves it.
3433: sub extractParts {
3434: my $self = shift;
3435:
3436: return if (defined($self->{PARTS}));
3437: return if ($self->ext);
3438:
3439: $self->{PARTS} = [];
3440:
3441: my %parts;
3442:
3443: # Retrieve part count, if this is a problem
3444: if ($self->is_problem()) {
3445: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3446: if (!$metadata) {
3447: $self->{RESOURCE_ERROR} = 1;
3448: $self->{PARTS} = [];
3449: $self->{PART_TYPE} = {};
3450: return;
3451: }
3452: foreach (split(/\,/,$metadata)) {
3453: if ($_ =~ /^part_(.*)$/) {
3454: my $part = $1;
3455: # This floods the logs if it blows up
3456: if (defined($parts{$part})) {
3457: Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3458: }
3459:
3460: # check to see if part is turned off.
3461:
3462: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3463: $parts{$part} = 1;
3464: }
3465: }
3466: }
3467:
3468:
3469: my @sortedParts = sort keys %parts;
3470: $self->{PARTS} = \@sortedParts;
3471:
3472: my %responseIdHash;
3473: my %responseTypeHash;
3474:
3475:
3476: # Init the responseIdHash
3477: foreach (@{$self->{PARTS}}) {
3478: $responseIdHash{$_} = [];
3479: }
3480:
3481: # Now, the unfortunate thing about this is that parts, part name, and
3482: # response if are delimited by underscores, but both the part
3483: # name and response id can themselves have underscores in them.
3484: # So we have to use our knowlege of part names to figure out
3485: # where the part names begin and end, and even then, it is possible
3486: # to construct ambiguous situations.
3487: foreach (split /,/, $metadata) {
3488: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3489: my $responseType = $1;
3490: my $partStuff = $2;
3491: my $partIdSoFar = '';
3492: my @partChunks = split /_/, $partStuff;
3493: my $i = 0;
3494:
3495: for ($i = 0; $i < scalar(@partChunks); $i++) {
3496: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3497: $partIdSoFar .= $partChunks[$i];
3498: if ($parts{$partIdSoFar}) {
3499: my @otherChunks = @partChunks[$i+1..$#partChunks];
3500: my $responseId = join('_', @otherChunks);
3501: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3502: $responseTypeHash{$partIdSoFar} = $responseType;
3503: last;
3504: }
3505: }
3506: }
3507: }
3508:
3509: $self->{RESPONSE_IDS} = \%responseIdHash;
3510: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3511: }
3512:
3513: return;
3514: }
3515:
3516: =pod
3517:
3518: =head2 Resource Status
3519:
3520: Problem resources have status information, reflecting their various
3521: dates and completion statuses.
3522:
3523: There are two aspects to the status: the date-related information and
3524: the completion information.
3525:
3526: Idiomatic usage of these two methods would probably look something
3527: like
3528:
3529: foreach ($resource->parts()) {
3530: my $dateStatus = $resource->getDateStatus($_);
3531: my $completionStatus = $resource->getCompletionStatus($_);
3532:
3533: or
3534:
3535: my $status = $resource->status($_);
3536:
3537: ... use it here ...
3538: }
3539:
3540: Which you use depends on exactly what you are looking for. The
3541: status() function has been optimized for the nav maps display and may
3542: not precisely match what you need elsewhere.
3543:
3544: The symbolic constants shown below can be accessed through the
3545: resource object: C<$res->OPEN>.
3546:
3547: =over 4
3548:
3549: =item * B<getDateStatus>($part):
3550:
3551: ($part defaults to 0). A convenience function that returns a symbolic
3552: constant telling you about the date status of the part. The possible
3553: return values are:
3554:
3555: =back
3556:
3557: B<Date Codes>
3558:
3559: =over 4
3560:
3561: =item * B<OPEN_LATER>:
3562:
3563: The problem will be opened later.
3564:
3565: =item * B<OPEN>:
3566:
3567: Open and not yet due.
3568:
3569:
3570: =item * B<PAST_DUE_ANSWER_LATER>:
3571:
3572: The due date has passed, but the answer date has not yet arrived.
3573:
3574: =item * B<PAST_DUE_NO_ANSWER>:
3575:
3576: The due date has passed and there is no answer opening date set.
3577:
3578: =item * B<ANSWER_OPEN>:
3579:
3580: The answer date is here.
3581:
3582: =item * B<NETWORK_FAILURE>:
3583:
3584: The information is unknown due to network failure.
3585:
3586: =back
3587:
3588: =cut
3589:
3590: # Apparently the compiler optimizes these into constants automatically
3591: sub OPEN_LATER { return 0; }
3592: sub OPEN { return 1; }
3593: sub PAST_DUE_NO_ANSWER { return 2; }
3594: sub PAST_DUE_ANSWER_LATER { return 3; }
3595: sub ANSWER_OPEN { return 4; }
3596: sub NOTHING_SET { return 5; }
3597: sub NETWORK_FAILURE { return 100; }
3598:
3599: # getDateStatus gets the date status for a given problem part.
3600: # Because answer date, due date, and open date are fully independent
3601: # (i.e., it is perfectly possible to *only* have an answer date),
3602: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3603: # (past, future, none given). This function handles this with a decision
3604: # tree. Read the comments to follow the decision tree.
3605:
3606: sub getDateStatus {
3607: my $self = shift;
3608: my $part = shift;
3609: $part = "0" if (!defined($part));
3610:
3611: # Always return network failure if there was one.
3612: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3613:
3614: my $now = time();
3615:
3616: my $open = $self->opendate($part);
3617: my $due = $self->duedate($part);
3618: my $answer = $self->answerdate($part);
3619:
3620: if (!$open && !$due && !$answer) {
3621: # no data on the problem at all
3622: # should this be the same as "open later"? think multipart.
3623: return $self->NOTHING_SET;
3624: }
3625: if (!$open || $now < $open) {return $self->OPEN_LATER}
3626: if (!$due || $now < $due) {return $self->OPEN}
3627: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3628: if ($answer) { return $self->ANSWER_OPEN; }
3629: return PAST_DUE_NO_ANSWER;
3630: }
3631:
3632: =pod
3633:
3634: B<>
3635:
3636: =over 4
3637:
3638: =item * B<getCompletionStatus>($part):
3639:
3640: ($part defaults to 0.) A convenience function that returns a symbolic
3641: constant telling you about the completion status of the part, with the
3642: following possible results:
3643:
3644: =back
3645:
3646: B<Completion Codes>
3647:
3648: =over 4
3649:
3650: =item * B<NOT_ATTEMPTED>:
3651:
3652: Has not been attempted at all.
3653:
3654: =item * B<INCORRECT>:
3655:
3656: Attempted, but wrong by student.
3657:
3658: =item * B<INCORRECT_BY_OVERRIDE>:
3659:
3660: Attempted, but wrong by instructor override.
3661:
3662: =item * B<CORRECT>:
3663:
3664: Correct or correct by instructor.
3665:
3666: =item * B<CORRECT_BY_OVERRIDE>:
3667:
3668: Correct by instructor override.
3669:
3670: =item * B<EXCUSED>:
3671:
3672: Excused. Not yet implemented.
3673:
3674: =item * B<NETWORK_FAILURE>:
3675:
3676: Information not available due to network failure.
3677:
3678: =item * B<ATTEMPTED>:
3679:
3680: Attempted, and not yet graded.
3681:
3682: =back
3683:
3684: =cut
3685:
3686: sub NOT_ATTEMPTED { return 10; }
3687: sub INCORRECT { return 11; }
3688: sub INCORRECT_BY_OVERRIDE { return 12; }
3689: sub CORRECT { return 13; }
3690: sub CORRECT_BY_OVERRIDE { return 14; }
3691: sub EXCUSED { return 15; }
3692: sub ATTEMPTED { return 16; }
3693:
3694: sub getCompletionStatus {
3695: my $self = shift;
3696: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3697:
3698: my $status = $self->queryRestoreHash('solved', shift);
3699:
3700: # Left as seperate if statements in case we ever do more with this
3701: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3702: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3703: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3704: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3705: if ($status eq 'excused') {return $self->EXCUSED; }
3706: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3707: return $self->NOT_ATTEMPTED;
3708: }
3709:
3710: sub queryRestoreHash {
3711: my $self = shift;
3712: my $hashentry = shift;
3713: my $part = shift;
3714: $part = "0" if (!defined($part) || $part eq '');
3715: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3716:
3717: $self->getReturnHash();
3718:
3719: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3720: }
3721:
3722: =pod
3723:
3724: B<Composite Status>
3725:
3726: Along with directly returning the date or completion status, the
3727: resource object includes a convenience function B<status>() that will
3728: combine the two status tidbits into one composite status that can
3729: represent the status of the resource as a whole. This method represents
3730: the concept of the thing we want to display to the user on the nav maps
3731: screen, which is a combination of completion and open status. The precise logic is
3732: documented in the comments of the status method. The following results
3733: may be returned, all available as methods on the resource object
3734: ($res->NETWORK_FAILURE): In addition to the return values that match
3735: the date or completion status, this function can return "ANSWER_SUBMITTED"
3736: if that problemstatus parameter value is set to No, suppressing the
3737: incorrect/correct feedback.
3738:
3739: =over 4
3740:
3741: =item * B<NETWORK_FAILURE>:
3742:
3743: The network has failed and the information is not available.
3744:
3745: =item * B<NOTHING_SET>:
3746:
3747: No dates have been set for this problem (part) at all. (Because only
3748: certain parts of a multi-part problem may be assigned, this can not be
3749: collapsed into "open later", as we do not know a given part will EVER
3750: be opened. For single part, this is the same as "OPEN_LATER".)
3751:
3752: =item * B<CORRECT>:
3753:
3754: For any reason at all, the part is considered correct.
3755:
3756: =item * B<EXCUSED>:
3757:
3758: For any reason at all, the problem is excused.
3759:
3760: =item * B<PAST_DUE_NO_ANSWER>:
3761:
3762: The problem is past due, not considered correct, and no answer date is
3763: set.
3764:
3765: =item * B<PAST_DUE_ANSWER_LATER>:
3766:
3767: The problem is past due, not considered correct, and an answer date in
3768: the future is set.
3769:
3770: =item * B<ANSWER_OPEN>:
3771:
3772: The problem is past due, not correct, and the answer is now available.
3773:
3774: =item * B<OPEN_LATER>:
3775:
3776: The problem is not yet open.
3777:
3778: =item * B<TRIES_LEFT>:
3779:
3780: The problem is open, has been tried, is not correct, but there are
3781: tries left.
3782:
3783: =item * B<INCORRECT>:
3784:
3785: The problem is open, and all tries have been used without getting the
3786: correct answer.
3787:
3788: =item * B<OPEN>:
3789:
3790: The item is open and not yet tried.
3791:
3792: =item * B<ATTEMPTED>:
3793:
3794: The problem has been attempted.
3795:
3796: =item * B<ANSWER_SUBMITTED>:
3797:
3798: An answer has been submitted, but the student should not see it.
3799:
3800: =back
3801:
3802: =cut
3803:
3804: sub TRIES_LEFT { return 20; }
3805: sub ANSWER_SUBMITTED { return 21; }
3806:
3807: sub status {
3808: my $self = shift;
3809: my $part = shift;
3810: if (!defined($part)) { $part = "0"; }
3811: my $completionStatus = $self->getCompletionStatus($part);
3812: my $dateStatus = $self->getDateStatus($part);
3813:
3814: # What we have is a two-dimensional matrix with 4 entries on one
3815: # dimension and 5 entries on the other, which we want to colorize,
3816: # plus network failure and "no date data at all".
3817:
3818: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3819:
3820: my $suppressFeedback = lc($self->parmval("problemstatus", $part)) eq 'no';
3821:
3822: # There are a few whole rows we can dispose of:
3823: if ($completionStatus == CORRECT ||
3824: $completionStatus == CORRECT_BY_OVERRIDE ) {
3825: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
3826: }
3827:
3828: if ($completionStatus == ATTEMPTED) {
3829: return ATTEMPTED;
3830: }
3831:
3832: # If it's EXCUSED, then return that no matter what
3833: if ($completionStatus == EXCUSED) {
3834: return EXCUSED;
3835: }
3836:
3837: if ($dateStatus == NOTHING_SET) {
3838: return NOTHING_SET;
3839: }
3840:
3841: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3842: # by 4 matrix (date statuses).
3843:
3844: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
3845: $dateStatus == PAST_DUE_NO_ANSWER ) {
3846: return $dateStatus;
3847: }
3848:
3849: if ($dateStatus == ANSWER_OPEN) {
3850: return ANSWER_OPEN;
3851: }
3852:
3853: # Now: (incorrect, incorrect_override, not_attempted) x
3854: # (open_later), (open)
3855:
3856: if ($dateStatus == OPEN_LATER) {
3857: return OPEN_LATER;
3858: }
3859:
3860: # If it's WRONG...
3861: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
3862: # and there are TRIES LEFT:
3863: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
3864: return TRIES_LEFT;
3865: }
3866: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
3867: }
3868:
3869: # Otherwise, it's untried and open
3870: return OPEN;
3871: }
3872:
3873: =pod
3874:
3875: B<Completable>
3876:
3877: The completable method represents the concept of I<whether the student can
3878: currently do the problem>. If the student can do the problem, which means
3879: that it is open, there are tries left, and if the problem is manually graded
3880: or the grade is suppressed via problemstatus, the student has not tried it
3881: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
3882: either the student has tried it and there is no feedback, or that for
3883: some reason it is no longer completable (not open yet, successfully completed,
3884: out of tries, etc.). As an example, this is used as the filter for the
3885: "Uncompleted Homework" option for the nav maps.
3886:
3887: If this does not quite meet your needs, do not fiddle with it (unless you are
3888: fixing it to better match the student's conception of "completable" because
3889: it's broken somehow)... make a new method.
3890:
3891: =cut
3892:
3893: sub completable {
3894: my $self = shift;
3895: if (!$self->is_problem()) { return 0; }
3896: my $partCount = $self->countParts();
3897:
3898: foreach my $part (@{$self->parts()}) {
3899: if ($part eq '0' && $partCount != 1) { next; }
3900: my $status = $self->status($part);
3901: # "If any of the parts are open, or have tries left (implies open),
3902: # and it is not "attempted" (manually graded problem), it is
3903: # not "complete"
3904: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
3905: $status == ANSWER_SUBMITTED() ) {
3906: # did this part already, as well as we can
3907: next;
3908: }
3909: if ($status == OPEN() || $status == TRIES_LEFT()) {
3910: return 1;
3911: }
3912: }
3913:
3914: # If all the parts were complete, so was this problem.
3915: return 0;
3916: }
3917:
3918: =pod
3919:
3920: =head2 Resource/Nav Map Navigation
3921:
3922: =over 4
3923:
3924: =item * B<getNext>():
3925:
3926: Retreive an array of the possible next resources after this
3927: one. Always returns an array, even in the one- or zero-element case.
3928:
3929: =item * B<getPrevious>():
3930:
3931: Retreive an array of the possible previous resources from this
3932: one. Always returns an array, even in the one- or zero-element case.
3933:
3934: =cut
3935:
3936: sub getNext {
3937: my $self = shift;
3938: my @branches;
3939: my $to = $self->to();
3940: foreach my $branch ( split(/,/, $to) ) {
3941: my $choice = $self->{NAV_MAP}->getById($branch);
3942: my $next = $choice->goesto();
3943: $next = $self->{NAV_MAP}->getById($next);
3944:
3945: push @branches, $next;
3946: }
3947: return \@branches;
3948: }
3949:
3950: sub getPrevious {
3951: my $self = shift;
3952: my @branches;
3953: my $from = $self->from();
3954: foreach my $branch ( split /,/, $from) {
3955: my $choice = $self->{NAV_MAP}->getById($branch);
3956: my $prev = $choice->comesfrom();
3957: $prev = $self->{NAV_MAP}->getById($prev);
3958:
3959: push @branches, $prev;
3960: }
3961: return \@branches;
3962: }
3963:
3964: sub browsePriv {
3965: my $self = shift;
3966: if (defined($self->{BROWSE_PRIV})) {
3967: return $self->{BROWSE_PRIV};
3968: }
3969:
3970: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
3971: }
3972:
3973: =pod
3974:
3975: =back
3976:
3977: =cut
3978:
3979: 1;
3980:
3981: __END__
3982:
3983:
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