1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.249 2004/02/24 19:14:42 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::loncommon();
35: use Apache::lonmenu();
36: use Apache::lonlocal;
37: use POSIX qw (floor strftime);
38: use Data::Dumper; # for debugging, not always used
39:
40: # symbolic constants
41: sub SYMB { return 1; }
42: sub URL { return 2; }
43: sub NOTHING { return 3; }
44:
45: # Some data
46:
47: my $resObj = "Apache::lonnavmaps::resource";
48:
49: # Keep these mappings in sync with lonquickgrades, which uses the colors
50: # instead of the icons.
51: my %statusIconMap =
52: (
53: $resObj->CLOSED => '',
54: $resObj->OPEN => 'navmap.open.gif',
55: $resObj->CORRECT => 'navmap.correct.gif',
56: $resObj->INCORRECT => 'navmap.wrong.gif',
57: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
58: $resObj->ERROR => ''
59: );
60:
61: my %iconAltTags =
62: ( 'navmap.correct.gif' => 'Correct',
63: 'navmap.wrong.gif' => 'Incorrect',
64: 'navmap.open.gif' => 'Open' );
65:
66: # Defines a status->color mapping, null string means don't color
67: my %colormap =
68: ( $resObj->NETWORK_FAILURE => '',
69: $resObj->CORRECT => '',
70: $resObj->EXCUSED => '#3333FF',
71: $resObj->PAST_DUE_ANSWER_LATER => '',
72: $resObj->PAST_DUE_NO_ANSWER => '',
73: $resObj->ANSWER_OPEN => '#006600',
74: $resObj->OPEN_LATER => '',
75: $resObj->TRIES_LEFT => '',
76: $resObj->INCORRECT => '',
77: $resObj->OPEN => '',
78: $resObj->NOTHING_SET => '',
79: $resObj->ATTEMPTED => '',
80: $resObj->ANSWER_SUBMITTED => ''
81: );
82: # And a special case in the nav map; what to do when the assignment
83: # is not yet done and due in less then 24 hours
84: my $hurryUpColor = "#FF0000";
85:
86: sub handler {
87: my $r = shift;
88: real_handler($r);
89: }
90:
91: sub real_handler {
92: my $r = shift;
93:
94: # Handle header-only request
95: if ($r->header_only) {
96: if ($ENV{'browser.mathml'}) {
97: &Apache::loncommon::content_type($r,'text/xml');
98: } else {
99: &Apache::loncommon::content_type($r,'text/html');
100: }
101: $r->send_http_header;
102: return OK;
103: }
104:
105: # Send header, don't cache this page
106: if ($ENV{'browser.mathml'}) {
107: &Apache::loncommon::content_type($r,'text/xml');
108: } else {
109: &Apache::loncommon::content_type($r,'text/html');
110: }
111: &Apache::loncommon::no_cache($r);
112: $r->send_http_header;
113:
114: # Create the nav map
115: my $navmap = Apache::lonnavmaps::navmap->new();
116:
117: if (!defined($navmap)) {
118: my $requrl = $r->uri;
119: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
120: return HTTP_NOT_ACCEPTABLE;
121: }
122:
123: $r->print("<html><head>\n");
124: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
125: # ------------------------------------------------------------ Get query string
126: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
127:
128: # ----------------------------------------------------- Force menu registration
129: my $addentries='';
130: if ($ENV{'form.register'}) {
131: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
132: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
133: $r->print(&Apache::lonmenu::registerurl(1));
134: }
135:
136: # Header
137: $r->print('</head>'.
138: &Apache::loncommon::bodytag('Navigate Course Contents','',
139: $addentries,'','',$ENV{'form.register'}));
140: $r->print('<script>window.focus();</script>');
141:
142: $r->rflush();
143:
144: # Check that it's defined
145: if (!($navmap->courseMapDefined())) {
146: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
147: '</body></html>');
148: return OK;
149: }
150:
151: # See if there's only one map in the top-level, if we don't
152: # already have a filter... if so, automatically display it
153: # (older code; should use retrieveResources)
154: if ($ENV{QUERY_STRING} !~ /filter/) {
155: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
156: my $curRes;
157: my $sequenceCount = 0;
158: my $sequenceId;
159: while ($curRes = $iterator->next()) {
160: if (ref($curRes) && $curRes->is_sequence()) {
161: $sequenceCount++;
162: $sequenceId = $curRes->map_pc();
163: }
164: }
165:
166: if ($sequenceCount == 1) {
167: # The automatic iterator creation in the render call
168: # will pick this up. We know the condition because
169: # the defined($ENV{'form.filter'}) also ensures this
170: # is a fresh call.
171: $ENV{'form.filter'} = "$sequenceId";
172: }
173: }
174:
175: my $jumpToFirstHomework = 0;
176: # Check to see if the student is jumping to next open, do-able problem
177: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
178: $jumpToFirstHomework = 1;
179: # Find the next homework problem that they can do.
180: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
181: my $curRes;
182: my $foundDoableProblem = 0;
183: my $problemRes;
184:
185: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
186: if (ref($curRes) && $curRes->is_problem()) {
187: my $status = $curRes->status();
188: if ($curRes->completable()) {
189: $problemRes = $curRes;
190: $foundDoableProblem = 1;
191:
192: # Pop open all previous maps
193: my $stack = $iterator->getStack();
194: pop @$stack; # last resource in the stack is the problem
195: # itself, which we don't need in the map stack
196: my @mapPcs = map {$_->map_pc()} @$stack;
197: $ENV{'form.filter'} = join(',', @mapPcs);
198:
199: # Mark as both "here" and "jump"
200: $ENV{'form.postsymb'} = $curRes->symb();
201: }
202: }
203: }
204:
205: # If we found no problems, print a note to that effect.
206: if (!$foundDoableProblem) {
207: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
208: }
209: } else {
210: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
211: &mt("Go To My First Homework Problem")."</a> ");
212: }
213:
214: my $suppressEmptySequences = 0;
215: my $filterFunc = undef;
216: my $resource_no_folder_link = 0;
217:
218: # Display only due homework.
219: my $showOnlyHomework = 0;
220: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
221: $showOnlyHomework = 1;
222: $suppressEmptySequences = 1;
223: $filterFunc = sub { my $res = shift;
224: return $res->completable() || $res->is_map();
225: };
226: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
227: $ENV{'form.filter'} = '';
228: $ENV{'form.condition'} = 1;
229: $resource_no_folder_link = 1;
230: } else {
231: $r->print("<a href='navmaps?showOnlyHomework'>" .
232: &mt("Show Only Uncompleted Homework")."</a> ");
233: }
234:
235: # renderer call
236: my $renderArgs = { 'cols' => [0,1,2,3],
237: 'url' => '/adm/navmaps',
238: 'navmap' => $navmap,
239: 'suppressNavmap' => 1,
240: 'suppressEmptySequences' => $suppressEmptySequences,
241: 'filterFunc' => $filterFunc,
242: 'resource_no_folder_link' => $resource_no_folder_link,
243: 'r' => $r};
244: my $render = render($renderArgs);
245: $navmap->untieHashes();
246:
247: # If no resources were printed, print a reassuring message so the
248: # user knows there was no error.
249: if ($renderArgs->{'counter'} == 0) {
250: if ($showOnlyHomework) {
251: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
252: } else { # both jumpToFirstHomework and normal use the same: course must be empty
253: $r->print("<p><font size='+1'>This course is empty.</font></p>");
254: }
255: }
256:
257: $r->print("</body></html>");
258: $r->rflush();
259:
260: return OK;
261: }
262:
263: # Convenience functions: Returns a string that adds or subtracts
264: # the second argument from the first hash, appropriate for the
265: # query string that determines which folders to recurse on
266: sub addToFilter {
267: my $hashIn = shift;
268: my $addition = shift;
269: my %hash = %$hashIn;
270: $hash{$addition} = 1;
271:
272: return join (",", keys(%hash));
273: }
274:
275: sub removeFromFilter {
276: my $hashIn = shift;
277: my $subtraction = shift;
278: my %hash = %$hashIn;
279:
280: delete $hash{$subtraction};
281: return join(",", keys(%hash));
282: }
283:
284: # Convenience function: Given a stack returned from getStack on the iterator,
285: # return the correct src() value.
286: # Later, this should add an anchor when we start putting anchors in pages.
287: sub getLinkForResource {
288: my $stack = shift;
289: my $res;
290:
291: # Check to see if there are any pages in the stack
292: foreach $res (@$stack) {
293: if (defined($res)) {
294: if ($res->is_page()) {
295: return $res->src();
296: }
297: # in case folder was skipped over as "only sequence"
298: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
299: if ($map=~/\.page$/) {
300: return &Apache::lonnet::clutter($map).'#'.
301: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
302: }
303: }
304: }
305:
306: # Failing that, return the src of the last resource that is defined
307: # (when we first recurse on a map, it puts an undefined resource
308: # on the bottom because $self->{HERE} isn't defined yet, and we
309: # want the src for the map anyhow)
310: foreach (@$stack) {
311: if (defined($_)) { $res = $_; }
312: }
313:
314: return $res->src();
315: }
316:
317: # Convenience function: This seperates the logic of how to create
318: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
319: # etc.) into a seperate function. It takes a resource object as the
320: # first parameter, and the part number of the resource as the second.
321: # It's basically a big switch statement on the status of the resource.
322:
323: sub getDescription {
324: my $res = shift;
325: my $part = shift;
326: my $status = $res->status($part);
327:
328: if ($status == $res->NETWORK_FAILURE) {
329: return &mt("Having technical difficulties; please check status later");
330: }
331: if ($status == $res->NOTHING_SET) {
332: return &mt("Not currently assigned.");
333: }
334: if ($status == $res->OPEN_LATER) {
335: return "Open " . timeToHumanString($res->opendate($part));
336: }
337: if ($status == $res->OPEN) {
338: if ($res->duedate($part)) {
339: return &mt("Due")." " .timeToHumanString($res->duedate($part));
340: } else {
341: return &mt("Open, no due date");
342: }
343: }
344: if ($status == $res->PAST_DUE_ANSWER_LATER) {
345: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
346: }
347: if ($status == $res->PAST_DUE_NO_ANSWER) {
348: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
349: }
350: if ($status == $res->ANSWER_OPEN) {
351: return &mt("Answer available");
352: }
353: if ($status == $res->EXCUSED) {
354: return &mt("Excused by instructor");
355: }
356: if ($status == $res->ATTEMPTED) {
357: return &mt("Answer submitted, not yet graded");
358: }
359: if ($status == $res->TRIES_LEFT) {
360: my $tries = $res->tries($part);
361: my $maxtries = $res->maxtries($part);
362: my $triesString = "";
363: if ($tries && $maxtries) {
364: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
365: if ($maxtries > 1 && $maxtries - $tries == 1) {
366: $triesString = "<b>$triesString</b>";
367: }
368: }
369: if ($res->duedate($part)) {
370: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
371: " $triesString";
372: } else {
373: return &mt("No due date")." $triesString";
374: }
375: }
376: if ($status == $res->ANSWER_SUBMITTED) {
377: return &mt('Answer submitted');
378: }
379: }
380:
381: # Convenience function, so others can use it: Is the problem due in less then
382: # 24 hours, and still can be done?
383:
384: sub dueInLessThen24Hours {
385: my $res = shift;
386: my $part = shift;
387: my $status = $res->status($part);
388:
389: return ($status == $res->OPEN() ||
390: $status == $res->TRIES_LEFT()) &&
391: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
392: $res->duedate($part) > time();
393: }
394:
395: # Convenience function, so others can use it: Is there only one try remaining for the
396: # part, with more then one try to begin with, not due yet and still can be done?
397: sub lastTry {
398: my $res = shift;
399: my $part = shift;
400:
401: my $tries = $res->tries($part);
402: my $maxtries = $res->maxtries($part);
403: return $tries && $maxtries && $maxtries > 1 &&
404: $maxtries - $tries == 1 && $res->duedate($part) &&
405: $res->duedate($part) > time();
406: }
407:
408: # This puts a human-readable name on the ENV variable.
409:
410: sub advancedUser {
411: return $ENV{'request.role.adv'};
412: }
413:
414:
415: # timeToHumanString takes a time number and converts it to a
416: # human-readable representation, meant to be used in the following
417: # manner:
418: # print "Due $timestring"
419: # print "Open $timestring"
420: # print "Answer available $timestring"
421: # Very, very, very, VERY English-only... goodness help a localizer on
422: # this func...
423: sub timeToHumanString {
424: my ($time) = @_;
425: # zero, '0' and blank are bad times
426: if (!$time) {
427: return &mt('never');
428: }
429: unless (&Apache::lonlocal::current_language()=~/^en/) {
430: return &Apache::lonlocal::locallocaltime($time);
431: }
432: my $now = time();
433:
434: my @time = localtime($time);
435: my @now = localtime($now);
436:
437: # Positive = future
438: my $delta = $time - $now;
439:
440: my $minute = 60;
441: my $hour = 60 * $minute;
442: my $day = 24 * $hour;
443: my $week = 7 * $day;
444: my $inPast = 0;
445:
446: # Logic in comments:
447: # Is it now? (extremely unlikely)
448: if ( $delta == 0 ) {
449: return "this instant";
450: }
451:
452: if ($delta < 0) {
453: $inPast = 1;
454: $delta = -$delta;
455: }
456:
457: if ( $delta > 0 ) {
458:
459: my $tense = $inPast ? " ago" : "";
460: my $prefix = $inPast ? "" : "in ";
461:
462: # Less then a minute
463: if ( $delta < $minute ) {
464: if ($delta == 1) { return "${prefix}1 second$tense"; }
465: return "$prefix$delta seconds$tense";
466: }
467:
468: # Less then an hour
469: if ( $delta < $hour ) {
470: # If so, use minutes
471: my $minutes = floor($delta / 60);
472: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
473: return "$prefix$minutes minutes$tense";
474: }
475:
476: # Is it less then 24 hours away? If so,
477: # display hours + minutes
478: if ( $delta < $hour * 24) {
479: my $hours = floor($delta / $hour);
480: my $minutes = floor(($delta % $hour) / $minute);
481: my $hourString = "$hours hours";
482: my $minuteString = ", $minutes minutes";
483: if ($hours == 1) {
484: $hourString = "1 hour";
485: }
486: if ($minutes == 1) {
487: $minuteString = ", 1 minute";
488: }
489: if ($minutes == 0) {
490: $minuteString = "";
491: }
492: return "$prefix$hourString$minuteString$tense";
493: }
494:
495: # Less then 5 days away, display day of the week and
496: # HH:MM
497: if ( $delta < $day * 5 ) {
498: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
499: $timeStr =~ s/12:00 am/00:00/;
500: $timeStr =~ s/12:00 pm/noon/;
501: return ($inPast ? "last " : "next ") .
502: $timeStr;
503: }
504:
505: # Is it this year?
506: if ( $time[5] == $now[5]) {
507: # Return on Month Day, HH:MM meridian
508: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
509: $timeStr =~ s/12:00 am/00:00/;
510: $timeStr =~ s/12:00 pm/noon/;
511: return $timeStr;
512: }
513:
514: # Not this year, so show the year
515: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
516: $timeStr =~ s/12:00 am/00:00/;
517: $timeStr =~ s/12:00 pm/noon/;
518: return $timeStr;
519: }
520: }
521:
522:
523: =pod
524:
525: =head1 NAME
526:
527: Apache::lonnavmap - Subroutines to handle and render the navigation
528: maps
529:
530: =head1 SYNOPSIS
531:
532: The main handler generates the navigational listing for the course,
533: the other objects export this information in a usable fashion for
534: other modules.
535:
536: =head1 OVERVIEW
537:
538: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
539: course structure and caches it in what is often referred to as the
540: "big hash" X<big hash>. You can see it if you are logged into
541: LON-CAPA, in a course, by going to /adm/test. (You may need to
542: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
543: content of the hash will be under the heading "Big Hash".
544:
545: Big Hash contains, among other things, how resources are related
546: to each other (next/previous), what resources are maps, which
547: resources are being chosen to not show to the student (for random
548: selection), and a lot of other things that can take a lot of time
549: to compute due to the amount of data that needs to be collected and
550: processed.
551:
552: Apache::lonnavmaps provides an object model for manipulating this
553: information in a higher-level fashion then directly manipulating
554: the hash. It also provides access to several auxilary functions
555: that aren't necessarily stored in the Big Hash, but are a per-
556: resource sort of value, like whether there is any feedback on
557: a given resource.
558:
559: Apache::lonnavmaps also abstracts away branching, and someday,
560: conditions, for the times where you don't really care about those
561: things.
562:
563: Apache::lonnavmaps also provides fairly powerful routines for
564: rendering navmaps, and last but not least, provides the navmaps
565: view for when the user clicks the NAV button.
566:
567: B<Note>: Apache::lonnavmaps I<only> works for the "currently
568: logged in user"; if you want things like "due dates for another
569: student" lonnavmaps can not directly retrieve information like
570: that. You need the EXT function. This module can still help,
571: because many things, such as the course structure, are constant
572: between users, and Apache::lonnavmaps can help by providing
573: symbs for the EXT call.
574:
575: The rest of this file will cover the provided rendering routines,
576: which can often be used without fiddling with the navmap object at
577: all, then documents the Apache::lonnavmaps::navmap object, which
578: is the key to accessing the Big Hash information, covers the use
579: of the Iterator (which provides the logic for traversing the
580: somewhat-complicated Big Hash data structure), documents the
581: Apache::lonnavmaps::Resource objects that are returned by
582:
583: =head1 Subroutine: render
584:
585: The navmap renderer package provides a sophisticated rendering of the
586: standard navigation maps interface into HTML. The provided nav map
587: handler is actually just a glorified call to this.
588:
589: Because of the large number of parameters this function accepts,
590: instead of passing it arguments as is normal, pass it in an anonymous
591: hash with the desired options.
592:
593: The package provides a function called 'render', called as
594: Apache::lonnavmaps::render({}).
595:
596: =head2 Overview of Columns
597:
598: The renderer will build an HTML table for the navmap and return
599: it. The table is consists of several columns, and a row for each
600: resource (or possibly each part). You tell the renderer how many
601: columns to create and what to place in each column, optionally using
602: one or more of the prepared columns, and the renderer will assemble
603: the table.
604:
605: Any additional generally useful column types should be placed in the
606: renderer code here, so anybody can use it anywhere else. Any code
607: specific to the current application (such as the addition of <input>
608: elements in a column) should be placed in the code of the thing using
609: the renderer.
610:
611: At the core of the renderer is the array reference COLS (see Example
612: section below for how to pass this correctly). The COLS array will
613: consist of entries of one of two types of things: Either an integer
614: representing one of the pre-packaged column types, or a sub reference
615: that takes a resource reference, a part number, and a reference to the
616: argument hash passed to the renderer, and returns a string that will
617: be inserted into the HTML representation as it.
618:
619: All other parameters are ways of either changing how the columns
620: are printing, or which rows are shown.
621:
622: The pre-packaged column names are refered to by constants in the
623: Apache::lonnavmaps namespace. The following currently exist:
624:
625: =over 4
626:
627: =item * B<Apache::lonnavmaps::resource>:
628:
629: The general info about the resource: Link, icon for the type, etc. The
630: first column in the standard nav map display. This column provides the
631: indentation effect seen in the B<NAV> screen. This column also accepts
632: the following parameters in the renderer hash:
633:
634: =over 4
635:
636: =item * B<resource_nolink>: default false
637:
638: If true, the resource will not be linked. By default, all non-folder
639: resources are linked.
640:
641: =item * B<resource_part_count>: default true
642:
643: If true, the resource will show a part count B<if> the full
644: part list is not displayed. (See "condense_parts" later.) If false,
645: the resource will never show a part count.
646:
647: =item * B<resource_no_folder_link>:
648:
649: If true, the resource's folder will not be clickable to open or close
650: it. Default is false. True implies printCloseAll is false, since you
651: can't close or open folders when this is on anyhow.
652:
653: =back
654:
655: =item * B<Apache::lonnavmaps::communication_status>:
656:
657: Whether there is discussion on the resource, email for the user, or
658: (lumped in here) perl errors in the execution of the problem. This is
659: the second column in the main nav map.
660:
661: =item * B<Apache::lonnavmaps::quick_status>:
662:
663: An icon for the status of a problem, with five possible states:
664: Correct, incorrect, open, awaiting grading (for a problem where the
665: computer's grade is suppressed, or the computer can't grade, like
666: essay problem), or none (not open yet, not a problem). The
667: third column of the standard navmap.
668:
669: =item * B<Apache::lonnavmaps::long_status>:
670:
671: A text readout of the details of the current status of the problem,
672: such as "Due in 22 hours". The fourth column of the standard navmap.
673:
674: =item * B<Apache::lonnavmaps::part_status_summary>:
675:
676: A text readout summarizing the status of the problem. If it is a
677: single part problem, will display "Correct", "Incorrect",
678: "Not yet open", "Open", "Attempted", or "Error". If there are
679: multiple parts, this will output a string that in HTML will show a
680: status of how many parts are in each status, in color coding, trying
681: to match the colors of the icons within reason.
682:
683: Note this only makes sense if you are I<not> showing parts. If
684: C<showParts> is true (see below), this column will not output
685: anything.
686:
687: =back
688:
689: If you add any others please be sure to document them here.
690:
691: An example of a column renderer that will show the ID number of a
692: resource, along with the part name if any:
693:
694: sub {
695: my ($resource, $part, $params) = @_;
696: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
697: return '<td>' . $resource->{ID} . '</td>';
698: }
699:
700: Note these functions are responsible for the TD tags, which allow them
701: to override vertical and horizontal alignment, etc.
702:
703: =head2 Parameters
704:
705: Minimally, you should be
706: able to get away with just using 'cols' (to specify the columns
707: shown), 'url' (necessary for the folders to link to the current screen
708: correctly), and possibly 'queryString' if your app calls for it. In
709: that case, maintaining the state of the folders will be done
710: automatically.
711:
712: =over 4
713:
714: =item * B<iterator>: default: constructs one from %ENV
715:
716: A reference to a fresh ::iterator to use from the navmaps. The
717: rendering will reflect the options passed to the iterator, so you can
718: use that to just render a certain part of the course, if you like. If
719: one is not passed, the renderer will attempt to construct one from
720: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
721: 'iterator_map' parameter if any.
722:
723: =item * B<iterator_map>: default: not used
724:
725: If you are letting the renderer do the iterator handling, you can
726: instruct the renderer to render only a particular map by passing it
727: the source of the map you want to process, like
728: '/res/103/jerf/navmap.course.sequence'.
729:
730: =item * B<navmap>: default: constructs one from %ENV
731:
732: A reference to a navmap, used only if an iterator is not passed in. If
733: this is necessary to make an iterator but it is not passed in, a new
734: one will be constructed based on ENV info. This is useful to do basic
735: error checking before passing it off to render.
736:
737: =item * B<r>: default: must be passed in
738:
739: The standard Apache response object. This must be passed to the
740: renderer or the course hash will be locked.
741:
742: =item * B<cols>: default: empty (useless)
743:
744: An array reference
745:
746: =item * B<showParts>:default true
747:
748: A flag. If true, a line for the resource itself, and a line
749: for each part will be displayed. If not, only one line for each
750: resource will be displayed.
751:
752: =item * B<condenseParts>: default true
753:
754: A flag. If true, if all parts of the problem have the same
755: status and that status is Nothing Set, Correct, or Network Failure,
756: then only one line will be displayed for that resource anyhow. If no,
757: all parts will always be displayed. If showParts is 0, this is
758: ignored.
759:
760: =item * B<jumpCount>: default: determined from %ENV
761:
762: A string identifying the URL to place the anchor 'curloc' at.
763: It is the responsibility of the renderer user to
764: ensure that the #curloc is in the URL. By default, determined through
765: the use of the ENV{} 'jump' information, and should normally "just
766: work" correctly.
767:
768: =item * B<here>: default: empty string
769:
770: A Symb identifying where to place the 'here' marker. The empty
771: string means no marker.
772:
773: =item * B<indentString>: default: 25 pixel whitespace image
774:
775: A string identifying the indentation string to use.
776:
777: =item * B<queryString>: default: empty
778:
779: A string which will be prepended to the query string used when the
780: folders are opened or closed. You can use this to pass
781: application-specific values.
782:
783: =item * B<url>: default: none
784:
785: The url the folders will link to, which should be the current
786: page. Required if the resource info column is shown, and you
787: are allowing the user to open and close folders.
788:
789: =item * B<currentJumpIndex>: default: no jumping
790:
791: Describes the currently-open row number to cause the browser to jump
792: to, because the user just opened that folder. By default, pulled from
793: the Jump information in the ENV{'form.*'}.
794:
795: =item * B<printKey>: default: false
796:
797: If true, print the key that appears on the top of the standard
798: navmaps.
799:
800: =item * B<printCloseAll>: default: true
801:
802: If true, print the "Close all folders" or "open all folders"
803: links.
804:
805: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
806:
807: A function that takes the resource object as its only parameter and
808: returns a true or false value. If true, the resource is displayed. If
809: false, it is simply skipped in the display.
810:
811: =item * B<suppressEmptySequences>: default: false
812:
813: If you're using a filter function, and displaying sequences to orient
814: the user, then frequently some sequences will be empty. Setting this to
815: true will cause those sequences not to display, so as not to confuse the
816: user into thinking that if the sequence is there there should be things
817: under it; for example, see the "Show Uncompleted Homework" view on the
818: B<NAV> screen.
819:
820: =item * B<suppressNavmaps>: default: false
821:
822: If true, will not display Navigate Content resources.
823:
824: =back
825:
826: =head2 Additional Info
827:
828: In addition to the parameters you can pass to the renderer, which will
829: be passed through unchange to the column renderers, the renderer will
830: generate the following information which your renderer may find
831: useful:
832:
833: =over 4
834:
835: =item * B<counter>:
836:
837: Contains the number of rows printed. Useful after calling the render
838: function, as you can detect whether anything was printed at all.
839:
840: =item * B<isNewBranch>:
841:
842: Useful for renderers: If this resource is currently the first resource
843: of a new branch, this will be true. The Resource column (leftmost in the
844: navmaps screen) uses this to display the "new branch" icon
845:
846: =back
847:
848: =cut
849:
850: sub resource { return 0; }
851: sub communication_status { return 1; }
852: sub quick_status { return 2; }
853: sub long_status { return 3; }
854: sub part_status_summary { return 4; }
855:
856: sub render_resource {
857: my ($resource, $part, $params) = @_;
858:
859: my $nonLinkedText = ''; # stuff after resource title not in link
860:
861: my $link = $params->{"resourceLink"};
862: my $src = $resource->src();
863: my $it = $params->{"iterator"};
864: my $filter = $it->{FILTER};
865:
866: my $title = $resource->compTitle();
867: if ($src =~ /^\/uploaded\//) {
868: $nonLinkedText=$title;
869: $title = '';
870: }
871: my $partLabel = "";
872: my $newBranchText = "";
873:
874: # If this is a new branch, label it so
875: if ($params->{'isNewBranch'}) {
876: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
877: }
878:
879: # links to open and close the folder
880: my $linkopen = "<a href='$link'>";
881: my $linkclose = "</a>";
882:
883: # Default icon: unknown page
884: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
885:
886: if ($resource->is_problem()) {
887: if ($part eq '0' || $params->{'condensed'}) {
888: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
889: } else {
890: $icon = $params->{'indentString'};
891: }
892: } else {
893: $icon = "<img src='".&Apache::loncommon::icon($resource->src).
894: "' alt='' border='0' />";
895: }
896:
897: # Display the correct map icon to open or shut map
898: if ($resource->is_map()) {
899: my $mapId = $resource->map_pc();
900: my $nowOpen = !defined($filter->{$mapId});
901: if ($it->{CONDITION}) {
902: $nowOpen = !$nowOpen;
903: }
904:
905: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
906:
907: if (!$params->{'resource_no_folder_link'}) {
908: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
909: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
910:
911: $linkopen = "<a href='" . $params->{'url'} . '?' .
912: $params->{'queryString'} . '&filter=';
913: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
914: addToFilter($filter, $mapId) :
915: removeFromFilter($filter, $mapId);
916: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
917: . $params->{'hereType'} . '&here=' .
918: &Apache::lonnet::escape($params->{'here'}) .
919: '&jump=' .
920: &Apache::lonnet::escape($resource->symb()) .
921: "&folderManip=1'>";
922: } else {
923: # Don't allow users to manipulate folder
924: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
925: '.nomanip.gif';
926: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
927:
928: $linkopen = "";
929: $linkclose = "";
930: }
931: }
932:
933: if ($resource->randomout()) {
934: $nonLinkedText .= ' <i>(hidden)</i> ';
935: }
936:
937: # We're done preparing and finally ready to start the rendering
938: my $result = "<td align='left' valign='center'>";
939:
940: my $indentLevel = $params->{'indentLevel'};
941: if ($newBranchText) { $indentLevel--; }
942:
943: # print indentation
944: for (my $i = 0; $i < $indentLevel; $i++) {
945: $result .= $params->{'indentString'};
946: }
947:
948: # Decide what to display
949: $result .= "$newBranchText$linkopen$icon$linkclose";
950:
951: my $curMarkerBegin = '';
952: my $curMarkerEnd = '';
953:
954: # Is this the current resource?
955: if (!$params->{'displayedHereMarker'} &&
956: $resource->symb() eq $params->{'here'} ) {
957: $curMarkerBegin = '<font color="red" size="+2">> </font>';
958: $curMarkerEnd = '<font color="red" size="+2"><</font>';
959: $params->{'displayedHereMarker'} = 1;
960: }
961:
962: if ($resource->is_problem() && $part ne '0' &&
963: !$params->{'condensed'}) {
964: my $displaypart=&Apache::lonnet::EXT('resource.'.$part.'.display',
965: $resource->symb());
966: unless ($displaypart) { $displaypart=$part; }
967: $partLabel = " (Part: $displaypart)";
968: $link.='#'.&Apache::lonnet::escape($part);
969: $title = "";
970: }
971:
972: if ($params->{'condensed'} && $resource->countParts() > 1) {
973: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
974: }
975:
976: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\// &&
977: !$resource->is_sequence()) {
978: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
979: } else {
980: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
981: }
982:
983: return $result;
984: }
985:
986: sub render_communication_status {
987: my ($resource, $part, $params) = @_;
988: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
989:
990: my $link = $params->{"resourceLink"};
991: my $linkopen = "<a href='$link'>";
992: my $linkclose = "</a>";
993:
994: if ($resource->hasDiscussion()) {
995: $discussionHTML = $linkopen .
996: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
997: $linkclose;
998: }
999:
1000: if ($resource->getFeedback()) {
1001: my $feedback = $resource->getFeedback();
1002: foreach (split(/\,/, $feedback)) {
1003: if ($_) {
1004: $feedbackHTML .= ' <a href="/adm/email?display='
1005: . &Apache::lonnet::escape($_) . '">'
1006: . '<img src="/adm/lonMisc/feedback.gif" '
1007: . 'border="0" /></a>';
1008: }
1009: }
1010: }
1011:
1012: if ($resource->getErrors()) {
1013: my $errors = $resource->getErrors();
1014: foreach (split(/,/, $errors)) {
1015: if ($_) {
1016: $errorHTML .= ' <a href="/adm/email?display='
1017: . &Apache::lonnet::escape($_) . '">'
1018: . '<img src="/adm/lonMisc/bomb.gif" '
1019: . 'border="0" /></a>';
1020: }
1021: }
1022: }
1023:
1024: if ($params->{'multipart'} && $part != '0') {
1025: $discussionHTML = $feedbackHTML = $errorHTML = '';
1026: }
1027:
1028: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1029:
1030: }
1031: sub render_quick_status {
1032: my ($resource, $part, $params) = @_;
1033: my $result = "";
1034: my $firstDisplayed = !$params->{'condensed'} &&
1035: $params->{'multipart'} && $part eq "0";
1036:
1037: my $link = $params->{"resourceLink"};
1038: my $linkopen = "<a href='$link'>";
1039: my $linkclose = "</a>";
1040:
1041: if ($resource->is_problem() &&
1042: !$firstDisplayed) {
1043:
1044: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1045: my $alt = $iconAltTags{$icon};
1046: if ($icon) {
1047: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1048: } else {
1049: $result .= "<td width='30'> </td>\n";
1050: }
1051: } else { # not problem, no icon
1052: $result .= "<td width='30'> </td>\n";
1053: }
1054:
1055: return $result;
1056: }
1057: sub render_long_status {
1058: my ($resource, $part, $params) = @_;
1059: my $result = "<td align='right' valign='center'>\n";
1060: my $firstDisplayed = !$params->{'condensed'} &&
1061: $params->{'multipart'} && $part eq "0";
1062:
1063: my $color;
1064: if ($resource->is_problem()) {
1065: $color = $colormap{$resource->status};
1066:
1067: if (dueInLessThen24Hours($resource, $part) ||
1068: lastTry($resource, $part)) {
1069: $color = $hurryUpColor;
1070: }
1071: }
1072:
1073: if ($resource->kind() eq "res" &&
1074: $resource->is_problem() &&
1075: !$firstDisplayed) {
1076: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1077: $result .= getDescription($resource, $part);
1078: if ($color) {$result .= "</b></font>"; }
1079: }
1080: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1081: $result .= '(randomly select ' . $resource->randompick() .')';
1082: }
1083:
1084: # Debugging code
1085: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1086: # ' - Part: ' . $part;
1087:
1088: $result .= "</td>\n";
1089:
1090: return $result;
1091: }
1092:
1093: # Colors obtained by taking the icons, matching the colors, and
1094: # possibly reducing the Value (HSV) of the color, if it's too bright
1095: # for text, generally by one third or so.
1096: my %statusColors =
1097: (
1098: $resObj->CLOSED => '#000000',
1099: $resObj->OPEN => '#998b13',
1100: $resObj->CORRECT => '#26933f',
1101: $resObj->INCORRECT => '#c48207',
1102: $resObj->ATTEMPTED => '#a87510',
1103: $resObj->ERROR => '#000000'
1104: );
1105: my %statusStrings =
1106: (
1107: $resObj->CLOSED => 'Not yet open',
1108: $resObj->OPEN => 'Open',
1109: $resObj->CORRECT => 'Correct',
1110: $resObj->INCORRECT => 'Incorrect',
1111: $resObj->ATTEMPTED => 'Attempted',
1112: $resObj->ERROR => 'Network Error'
1113: );
1114: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1115:
1116: use Data::Dumper;
1117: sub render_parts_summary_status {
1118: my ($resource, $part, $params) = @_;
1119: if (!$resource->is_problem()) { return '<td></td>'; }
1120: if ($params->{showParts}) {
1121: return '<td></td>';
1122: }
1123:
1124: my $td = "<td align='right'>\n";
1125: my $endtd = "</td>\n";
1126:
1127: # If there is a single part, just show the simple status
1128: if ($resource->singlepart()) {
1129: my $status = $resource->simpleStatus('0');
1130: return $td . "<font color='" . $statusColors{$status} . "'>"
1131: . $statusStrings{$status} . "</font>" . $endtd;
1132: }
1133:
1134: # Now we can be sure the $part doesn't really matter.
1135: my $statusCount = $resource->simpleStatusCount();
1136: my @counts;
1137: foreach my $status(@statuses) {
1138: # decouple display order from the simpleStatusCount order
1139: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1140: if ($statusCount->[$slot]) {
1141: push @counts, "<font color='" . $statusColors{$status} .
1142: "'>" . $statusCount->[$slot] . ' '
1143: . $statusStrings{$status} . "</font>";
1144: }
1145: }
1146:
1147: return $td . $resource->countParts() . ' parts: ' . join (', ', @counts) . $endtd;
1148: }
1149:
1150: my @preparedColumns = (\&render_resource, \&render_communication_status,
1151: \&render_quick_status, \&render_long_status,
1152: \&render_parts_summary_status);
1153:
1154: sub setDefault {
1155: my ($val, $default) = @_;
1156: if (!defined($val)) { return $default; }
1157: return $val;
1158: }
1159:
1160: sub render {
1161: my $args = shift;
1162: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1163: my $result = '';
1164:
1165: # Configure the renderer.
1166: my $cols = $args->{'cols'};
1167: if (!defined($cols)) {
1168: # no columns, no nav maps.
1169: return '';
1170: }
1171: my $mustCloseNavMap = 0;
1172: my $navmap;
1173: if (defined($args->{'navmap'})) {
1174: $navmap = $args->{'navmap'};
1175: }
1176:
1177: my $r = $args->{'r'};
1178: my $queryString = $args->{'queryString'};
1179: my $jump = $args->{'jump'};
1180: my $here = $args->{'here'};
1181: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1182: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1183: # before the current resource when using #current
1184:
1185: # If we were passed 'here' information, we are not rendering
1186: # after a folder manipulation, and we were not passed an
1187: # iterator, make sure we open the folders to show the "here"
1188: # marker
1189: my $filterHash = {};
1190: # Figure out what we're not displaying
1191: foreach (split(/\,/, $ENV{"form.filter"})) {
1192: if ($_) {
1193: $filterHash->{$_} = "1";
1194: }
1195: }
1196:
1197: # Filter: Remember filter function and add our own filter: Refuse
1198: # to show hidden resources unless the user can see them.
1199: my $userCanSeeHidden = advancedUser();
1200: my $filterFunc = setDefault($args->{'filterFunc'},
1201: sub {return 1;});
1202: if (!$userCanSeeHidden) {
1203: # Without renaming the filterfunc, the server seems to go into
1204: # an infinite loop
1205: my $oldFilterFunc = $filterFunc;
1206: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1207: &$oldFilterFunc($res);};
1208: }
1209:
1210: my $condition = 0;
1211: if ($ENV{'form.condition'}) {
1212: $condition = 1;
1213: }
1214:
1215: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1216: # Step 1: Check to see if we have a navmap
1217: if (!defined($navmap)) {
1218: $navmap = Apache::lonnavmaps::navmap->new();
1219: $mustCloseNavMap = 1;
1220: }
1221:
1222: # Step two: Locate what kind of here marker is necessary
1223: # Determine where the "here" marker is and where the screen jumps to.
1224:
1225: if ($ENV{'form.postsymb'}) {
1226: $here = $jump = $ENV{'form.postsymb'};
1227: } elsif ($ENV{'form.postdata'}) {
1228: # couldn't find a symb, is there a URL?
1229: my $currenturl = $ENV{'form.postdata'};
1230: #$currenturl=~s/^http\:\/\///;
1231: #$currenturl=~s/^[^\/]+//;
1232:
1233: $here = $jump = &Apache::lonnet::symbread($currenturl);
1234: }
1235:
1236: # Step three: Ensure the folders are open
1237: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1238: my $curRes;
1239: my $found = 0;
1240:
1241: # We only need to do this if we need to open the maps to show the
1242: # current position. This will change the counter so we can't count
1243: # for the jump marker with this loop.
1244: while (($curRes = $mapIterator->next()) && !$found) {
1245: if (ref($curRes) && $curRes->symb() eq $here) {
1246: my $mapStack = $mapIterator->getStack();
1247:
1248: # Ensure the parent maps are open
1249: for my $map (@{$mapStack}) {
1250: if ($condition) {
1251: undef $filterHash->{$map->map_pc()};
1252: } else {
1253: $filterHash->{$map->map_pc()} = 1;
1254: }
1255: }
1256: $found = 1;
1257: }
1258: }
1259: }
1260:
1261: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1262: # If this is a click on a folder or something, we want to preserve the "here"
1263: # from the querystring, and get the new "jump" marker
1264: $here = $ENV{'form.here'};
1265: $jump = $ENV{'form.jump'};
1266: }
1267:
1268: my $it = $args->{'iterator'};
1269: if (!defined($it)) {
1270: # Construct a default iterator based on $ENV{'form.'} information
1271:
1272: # Step 1: Check to see if we have a navmap
1273: if (!defined($navmap)) {
1274: $navmap = Apache::lonnavmaps::navmap->new();
1275: $mustCloseNavMap = 1;
1276: }
1277:
1278: # See if we're being passed a specific map
1279: if ($args->{'iterator_map'}) {
1280: my $map = $args->{'iterator_map'};
1281: $map = $navmap->getResourceByUrl($map);
1282: my $firstResource = $map->map_start();
1283: my $finishResource = $map->map_finish();
1284:
1285: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1286: } else {
1287: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1288: }
1289: }
1290:
1291: # (re-)Locate the jump point, if any
1292: # Note this does not take filtering or hidden into account... need
1293: # to be fixed?
1294: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1295: my $curRes;
1296: my $foundJump = 0;
1297: my $counter = 0;
1298:
1299: while (($curRes = $mapIterator->next()) && !$foundJump) {
1300: if (ref($curRes)) { $counter++; }
1301:
1302: if (ref($curRes) && $jump eq $curRes->symb()) {
1303:
1304: # This is why we have to use the main iterator instead of the
1305: # potentially faster DFS: The count has to be the same, so
1306: # the order has to be the same, which DFS won't give us.
1307: $args->{'currentJumpIndex'} = $counter;
1308: $foundJump = 1;
1309: }
1310: }
1311:
1312: my $showParts = setDefault($args->{'showParts'}, 1);
1313: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1314: # keeps track of when the current resource is found,
1315: # so we can back up a few and put the anchor above the
1316: # current resource
1317: my $printKey = $args->{'printKey'};
1318: my $printCloseAll = $args->{'printCloseAll'};
1319: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1320:
1321: # Print key?
1322: if ($printKey) {
1323: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1324: my $date=localtime;
1325: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1326: if ($navmap->{LAST_CHECK}) {
1327: $result .=
1328: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1329: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1330: '</td><td align="center" valign="bottom"> '.
1331: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1332: '</td>';
1333: } else {
1334: $result .= '<td align="center" valign="bottom"> '.
1335: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1336: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1337: '</td>';
1338: }
1339:
1340: $result .= '</tr></table>';
1341: }
1342:
1343: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1344: if ($condition) {
1345: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1346: "&here=" . Apache::lonnet::escape($here) .
1347: "\">".&mt('Close All Folders')."</a>";
1348: } else {
1349: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1350: "&here=" . Apache::lonnet::escape($here) .
1351: "\">".&mt('Open All Folders')."</a>";
1352: }
1353: $result .= "<br /><br />\n";
1354: }
1355:
1356: if ($r) {
1357: $r->print($result);
1358: $r->rflush();
1359: $result = "";
1360: }
1361: # End parameter setting
1362:
1363: # Data
1364: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1365: my $res = "Apache::lonnavmaps::resource";
1366: my %condenseStatuses =
1367: ( $res->NETWORK_FAILURE => 1,
1368: $res->NOTHING_SET => 1,
1369: $res->CORRECT => 1 );
1370: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1371:
1372: # Shared variables
1373: $args->{'counter'} = 0; # counts the rows
1374: $args->{'indentLevel'} = 0;
1375: $args->{'isNewBranch'} = 0;
1376: $args->{'condensed'} = 0;
1377: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1378: $args->{'displayedHereMarker'} = 0;
1379:
1380: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1381: # since structure actually doesn't matter, except what map has what resources.
1382: if ($args->{'suppressEmptySequences'}) {
1383: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1384: $it->{FIRST_RESOURCE},
1385: $it->{FINISH_RESOURCE},
1386: {}, undef, 1);
1387: my $depth = 0;
1388: $dfsit->next();
1389: my $curRes = $dfsit->next();
1390: while ($depth > -1) {
1391: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1392: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1393:
1394: if (ref($curRes)) {
1395: # Parallel pre-processing: Do sequences have non-filtered-out children?
1396: if ($curRes->is_map()) {
1397: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1398: # Sequences themselves do not count as visible children,
1399: # unless those sequences also have visible children.
1400: # This means if a sequence appears, there's a "promise"
1401: # that there's something under it if you open it, somewhere.
1402: } else {
1403: # Not a sequence: if it's filtered, ignore it, otherwise
1404: # rise up the stack and mark the sequences as having children
1405: if (&$filterFunc($curRes)) {
1406: for my $sequence (@{$dfsit->getStack()}) {
1407: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1408: }
1409: }
1410: }
1411: }
1412: } continue {
1413: $curRes = $dfsit->next();
1414: }
1415: }
1416:
1417: my $displayedJumpMarker = 0;
1418: # Set up iteration.
1419: my $now = time();
1420: my $in24Hours = $now + 24 * 60 * 60;
1421: my $rownum = 0;
1422:
1423: # export "here" marker information
1424: $args->{'here'} = $here;
1425:
1426: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1427: while ($curRes = $it->next()) {
1428: # Maintain indentation level.
1429: if ($curRes == $it->BEGIN_MAP() ||
1430: $curRes == $it->BEGIN_BRANCH() ) {
1431: $args->{'indentLevel'}++;
1432: }
1433: if ($curRes == $it->END_MAP() ||
1434: $curRes == $it->END_BRANCH() ) {
1435: $args->{'indentLevel'}--;
1436: }
1437: # Notice new branches
1438: if ($curRes == $it->BEGIN_BRANCH()) {
1439: $args->{'isNewBranch'} = 1;
1440: }
1441:
1442: # If this isn't an actual resource, continue on
1443: if (!ref($curRes)) {
1444: next;
1445: }
1446:
1447: # If this has been filtered out, continue on
1448: if (!(&$filterFunc($curRes))) {
1449: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1450: next;
1451: }
1452:
1453: # If this is an empty sequence and we're filtering them, continue on
1454: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1455: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1456: next;
1457: }
1458:
1459: # If we're suppressing navmaps and this is a navmap, continue on
1460: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1461: next;
1462: }
1463:
1464: $args->{'counter'}++;
1465:
1466: # Does it have multiple parts?
1467: $args->{'multipart'} = 0;
1468: $args->{'condensed'} = 0;
1469: my @parts;
1470:
1471: # Decide what parts to show.
1472: if ($curRes->is_problem() && $showParts) {
1473: @parts = @{$curRes->parts()};
1474: $args->{'multipart'} = $curRes->multipart();
1475:
1476: if ($condenseParts) { # do the condensation
1477: if (!$curRes->opendate("0")) {
1478: @parts = ();
1479: $args->{'condensed'} = 1;
1480: }
1481: if (!$args->{'condensed'}) {
1482: # Decide whether to condense based on similarity
1483: my $status = $curRes->status($parts[0]);
1484: my $due = $curRes->duedate($parts[0]);
1485: my $open = $curRes->opendate($parts[0]);
1486: my $statusAllSame = 1;
1487: my $dueAllSame = 1;
1488: my $openAllSame = 1;
1489: for (my $i = 1; $i < scalar(@parts); $i++) {
1490: if ($curRes->status($parts[$i]) != $status){
1491: $statusAllSame = 0;
1492: }
1493: if ($curRes->duedate($parts[$i]) != $due ) {
1494: $dueAllSame = 0;
1495: }
1496: if ($curRes->opendate($parts[$i]) != $open) {
1497: $openAllSame = 0;
1498: }
1499: }
1500: # $*allSame is true if all the statuses were
1501: # the same. Now, if they are all the same and
1502: # match one of the statuses to condense, or they
1503: # are all open with the same due date, or they are
1504: # all OPEN_LATER with the same open date, display the
1505: # status of the first non-zero part (to get the 'correct'
1506: # status right, since 0 is never 'correct' or 'open').
1507: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1508: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1509: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1510: @parts = ($parts[0]);
1511: $args->{'condensed'} = 1;
1512: }
1513: }
1514: # Multipart problem with one part: always "condense" (happens
1515: # to match the desirable behavior)
1516: if ($curRes->countParts() == 1) {
1517: @parts = ($parts[0]);
1518: $args->{'condensed'} = 1;
1519: }
1520: }
1521: }
1522:
1523: # If the multipart problem was condensed, "forget" it was multipart
1524: if (scalar(@parts) == 1) {
1525: $args->{'multipart'} = 0;
1526: } else {
1527: # Add part 0 so we display it correctly.
1528: unshift @parts, '0';
1529: }
1530:
1531: # Now, we've decided what parts to show. Loop through them and
1532: # show them.
1533: foreach my $part (@parts) {
1534: $rownum ++;
1535: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1536:
1537: $result .= " <tr bgcolor='$backgroundColor'>\n";
1538:
1539: # Set up some data about the parts that the cols might want
1540: my $filter = $it->{FILTER};
1541: my $stack = $it->getStack();
1542: my $src = getLinkForResource($stack);
1543: my $anchor='';
1544: if ($src=~s/(\#.*$)//) {
1545: $anchor=$1;
1546: }
1547: my $srcHasQuestion = $src =~ /\?/;
1548: $args->{"resourceLink"} = $src.
1549: ($srcHasQuestion?'&':'?') .
1550: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1551: $anchor;
1552:
1553: # Now, display each column.
1554: foreach my $col (@$cols) {
1555: my $colHTML = '';
1556: if (ref($col)) {
1557: $colHTML .= &$col($curRes, $part, $args);
1558: } else {
1559: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1560: }
1561:
1562: # If this is the first column and it's time to print
1563: # the anchor, do so
1564: if ($col == $cols->[0] &&
1565: $args->{'counter'} == $args->{'currentJumpIndex'} -
1566: $currentJumpDelta) {
1567: # Jam the anchor after the <td> tag;
1568: # necessary for valid HTML (which Mozilla requires)
1569: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1570: $displayedJumpMarker = 1;
1571: }
1572: $result .= $colHTML . "\n";
1573: }
1574: $result .= " </tr>\n";
1575: $args->{'isNewBranch'} = 0;
1576: }
1577:
1578: if ($r && $rownum % 20 == 0) {
1579: $r->print($result);
1580: $result = "";
1581: $r->rflush();
1582: }
1583: } continue {
1584: if ($r) {
1585: # If we have the connection, make sure the user is still connected
1586: my $c = $r->connection;
1587: if ($c->aborted()) {
1588: # Who cares what we do, nobody will see it anyhow.
1589: return '';
1590: }
1591: }
1592: }
1593:
1594: # Print out the part that jumps to #curloc if it exists
1595: # delay needed because the browser is processing the jump before
1596: # it finishes rendering, so it goes to the wrong place!
1597: # onload might be better, but this routine has no access to that.
1598: # On mozilla, the 0-millisecond timeout seems to prevent this;
1599: # it's quite likely this might fix other browsers, too, and
1600: # certainly won't hurt anything.
1601: if ($displayedJumpMarker) {
1602: $result .= "
1603: <script>
1604: if (location.href.indexOf('#curloc')==-1) {
1605: setTimeout(\"location += '#curloc';\", 0)
1606: }
1607: </script>";
1608: }
1609:
1610: $result .= "</table>";
1611:
1612: if ($r) {
1613: $r->print($result);
1614: $result = "";
1615: $r->rflush();
1616: }
1617:
1618: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1619:
1620: return $result;
1621: }
1622:
1623: 1;
1624:
1625: package Apache::lonnavmaps::navmap;
1626:
1627: =pod
1628:
1629: =head1 Object: Apache::lonnavmaps::navmap
1630:
1631: =head2 Overview
1632:
1633: The navmap object's job is to provide access to the resources
1634: in the course as Apache::lonnavmaps::resource objects, and to
1635: query and manage the relationship between those resource objects.
1636:
1637: Generally, you'll use the navmap object in one of three basic ways.
1638: In order of increasing complexity and power:
1639:
1640: =over 4
1641:
1642: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1643: various ways to obtain resource objects, based on various identifiers.
1644: Use this when you want to request information about one object or
1645: a handful of resources you already know the identities of, from some
1646: other source. For more about Ids, Symbs, and MapPcs, see the
1647: Resource documentation. Note that Url should be a B<last resort>,
1648: not your first choice; it only works when there is only one
1649: instance of the resource in the course, which only applies to
1650: maps, and even that may change in the future.
1651:
1652: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1653: retrieves resources matching some criterion and returns them
1654: in a flat array, with no structure information. Use this when
1655: you are manipulating a series of resources, based on what map
1656: the are in, but do not care about branching, or exactly how
1657: the maps and resources are related. This is the most common case.
1658:
1659: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1660: the course's navmap in various ways without writing the traversal
1661: code yourself. See iterator documentation below. Use this when
1662: you need to know absolutely everything about the course, including
1663: branches and the precise relationship between maps and resources.
1664:
1665: =back
1666:
1667: =head2 Creation And Destruction
1668:
1669: To create a navmap object, use the following function:
1670:
1671: =over 4
1672:
1673: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1674:
1675: Creates a new navmap object. Returns the navmap object if this is
1676: successful, or B<undef> if not.
1677:
1678: =back
1679:
1680: When you are done with the $navmap object, you I<must> call
1681: $navmap->untieHashes(), or you'll prevent the current user from using that
1682: course until the web server is restarted. (!)
1683:
1684: =head2 Methods
1685:
1686: =over 4
1687:
1688: =item * B<getIterator>(first, finish, filter, condition):
1689:
1690: See iterator documentation below.
1691:
1692: =cut
1693:
1694: use strict;
1695: use GDBM_File;
1696:
1697: sub new {
1698: # magic invocation to create a class instance
1699: my $proto = shift;
1700: my $class = ref($proto) || $proto;
1701: my $self = {};
1702:
1703: # Resource cache stores navmap resources as we reference them. We generate
1704: # them on-demand so we don't pay for creating resources unless we use them.
1705: $self->{RESOURCE_CACHE} = {};
1706:
1707: # Network failure flag, if we accessed the course or user opt and
1708: # failed
1709: $self->{NETWORK_FAILURE} = 0;
1710:
1711: # tie the nav hash
1712:
1713: my %navmaphash;
1714: my %parmhash;
1715: my $courseFn = $ENV{"request.course.fn"};
1716: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1717: &GDBM_READER(), 0640))) {
1718: return undef;
1719: }
1720:
1721: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1722: &GDBM_READER(), 0640)))
1723: {
1724: untie %{$self->{PARM_HASH}};
1725: return undef;
1726: }
1727:
1728: $self->{NAV_HASH} = \%navmaphash;
1729: $self->{PARM_HASH} = \%parmhash;
1730: $self->{PARM_CACHE} = {};
1731:
1732: bless($self);
1733:
1734: return $self;
1735: }
1736:
1737: sub generate_course_user_opt {
1738: my $self = shift;
1739: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1740:
1741: my $uname=$ENV{'user.name'};
1742: my $udom=$ENV{'user.domain'};
1743: my $uhome=$ENV{'user.home'};
1744: my $cid=$ENV{'request.course.id'};
1745: my $chome=$ENV{'course.'.$cid.'.home'};
1746: my ($cdom,$cnum)=split(/\_/,$cid);
1747:
1748: my $userprefix=$uname.'_'.$udom.'_';
1749:
1750: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1751: unless ($uhome eq 'no_host') {
1752: # ------------------------------------------------- Get coursedata (if present)
1753: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1754: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1755: ':resourcedata',$chome);
1756: # Check for network failure
1757: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1758: $self->{NETWORK_FAILURE} = 1;
1759: } elsif ($reply!~/^error\:/) {
1760: $courserdatas{$cid}=$reply;
1761: $courserdatas{$cid.'.last_cache'}=time;
1762: }
1763: }
1764: foreach (split(/\&/,$courserdatas{$cid})) {
1765: my ($name,$value)=split(/\=/,$_);
1766: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1767: &Apache::lonnet::unescape($value);
1768: }
1769: # --------------------------------------------------- Get userdata (if present)
1770: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1771: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1772: if ($reply!~/^error\:/) {
1773: $userrdatas{$uname.'___'.$udom}=$reply;
1774: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1775: }
1776: # check to see if network failed
1777: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1778: {
1779: $self->{NETWORK_FAILURE} = 1;
1780: }
1781: }
1782: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1783: my ($name,$value)=split(/\=/,$_);
1784: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1785: &Apache::lonnet::unescape($value);
1786: }
1787: $self->{COURSE_OPT} = \%courseopt;
1788: $self->{USER_OPT} = \%useropt;
1789: }
1790:
1791: $self->{COURSE_USER_OPT_GENERATED} = 1;
1792:
1793: return;
1794: }
1795:
1796: sub generate_email_discuss_status {
1797: my $self = shift;
1798: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1799:
1800: my $cid=$ENV{'request.course.id'};
1801: my ($cdom,$cnum)=split(/\_/,$cid);
1802:
1803: my %emailstatus = &Apache::lonnet::dump('email_status');
1804: my $logoutTime = $emailstatus{'logout'};
1805: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1806: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1807: $courseLeaveTime : $logoutTime);
1808: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1809: $cdom, $cnum);
1810: my %feedback=();
1811: my %error=();
1812: my $keys = &Apache::lonnet::reply('keys:'.
1813: $ENV{'user.domain'}.':'.
1814: $ENV{'user.name'}.':nohist_email',
1815: $ENV{'user.home'});
1816:
1817: foreach my $msgid (split(/\&/, $keys)) {
1818: $msgid=&Apache::lonnet::unescape($msgid);
1819: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1820: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1821: my ($what,$url)=($1,$2);
1822: my %status=
1823: &Apache::lonnet::get('email_status',[$msgid]);
1824: if ($status{$msgid}=~/^error\:/) {
1825: $status{$msgid}='';
1826: }
1827:
1828: if (($status{$msgid} eq 'new') ||
1829: (!$status{$msgid})) {
1830: if ($what eq 'Error') {
1831: $error{$url}.=','.$msgid;
1832: } else {
1833: $feedback{$url}.=','.$msgid;
1834: }
1835: }
1836: }
1837: }
1838:
1839: $self->{FEEDBACK} = \%feedback;
1840: $self->{ERROR_MSG} = \%error; # what is this? JB
1841: $self->{DISCUSSION_TIME} = \%discussiontime;
1842: $self->{EMAIL_STATUS} = \%emailstatus;
1843:
1844: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1845: }
1846:
1847: sub get_user_data {
1848: my $self = shift;
1849: if ($self->{RETRIEVED_USER_DATA}) { return; }
1850:
1851: # Retrieve performance data on problems
1852: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1853: $ENV{'user.domain'},
1854: $ENV{'user.name'});
1855: $self->{STUDENT_DATA} = \%student_data;
1856:
1857: $self->{RETRIEVED_USER_DATA} = 1;
1858: }
1859:
1860: # Internal function: Takes a key to look up in the nav hash and implements internal
1861: # memory caching of that key.
1862: sub navhash {
1863: my $self = shift; my $key = shift;
1864: return $self->{NAV_HASH}->{$key};
1865: }
1866:
1867: =pod
1868:
1869: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1870: false otherwise. Undefined course maps indicate an error somewhere in
1871: LON-CAPA, and you will not be able to proceed with using the navmap.
1872: See the B<NAV> screen for an example of using this.
1873:
1874: =cut
1875:
1876: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1877: sub courseMapDefined {
1878: my $self = shift;
1879: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1880:
1881: my $firstres = $self->navhash("map_start_$uri");
1882: my $lastres = $self->navhash("map_finish_$uri");
1883: return $firstres && $lastres;
1884: }
1885:
1886: sub getIterator {
1887: my $self = shift;
1888: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1889: shift, undef, shift);
1890: return $iterator;
1891: }
1892:
1893: # unties the hash when done
1894: sub untieHashes {
1895: my $self = shift;
1896: untie %{$self->{NAV_HASH}};
1897: untie %{$self->{PARM_HASH}};
1898: }
1899:
1900: # Private method: Does the given resource (as a symb string) have
1901: # current discussion? Returns 0 if chat/mail data not extracted.
1902: sub hasDiscussion {
1903: my $self = shift;
1904: my $symb = shift;
1905:
1906: $self->generate_email_discuss_status();
1907:
1908: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1909:
1910: #return defined($self->{DISCUSSION_TIME}->{$symb});
1911: return $self->{DISCUSSION_TIME}->{$symb} >
1912: $self->{LAST_CHECK};
1913: }
1914:
1915: # Private method: Does the given resource (as a symb string) have
1916: # current feedback? Returns the string in the feedback hash, which
1917: # will be false if it does not exist.
1918: sub getFeedback {
1919: my $self = shift;
1920: my $symb = shift;
1921:
1922: $self->generate_email_discuss_status();
1923:
1924: if (!defined($self->{FEEDBACK})) { return ""; }
1925:
1926: return $self->{FEEDBACK}->{$symb};
1927: }
1928:
1929: # Private method: Get the errors for that resource (by source).
1930: sub getErrors {
1931: my $self = shift;
1932: my $src = shift;
1933:
1934: $self->generate_email_discuss_status();
1935:
1936: if (!defined($self->{ERROR_MSG})) { return ""; }
1937: return $self->{ERROR_MSG}->{$src};
1938: }
1939:
1940: =pod
1941:
1942: =item * B<getById>(id):
1943:
1944: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1945: object for that resource. This method, or other methods that use it
1946: (as in the resource object) is the only proper way to obtain a
1947: resource object.
1948:
1949: =item * B<getBySymb>(symb):
1950:
1951: Based on the symb of the resource, get a resource object for that
1952: resource. This is one of the proper ways to get a resource object.
1953:
1954: =item * B<getMapByMapPc>(map_pc):
1955:
1956: Based on the map_pc of the resource, get a resource object for
1957: the given map. This is one of the proper ways to get a resource object.
1958:
1959: =cut
1960:
1961: # The strategy here is to cache the resource objects, and only construct them
1962: # as we use them. The real point is to prevent reading any more from the tied
1963: # hash then we have to, which should hopefully alleviate speed problems.
1964:
1965: sub getById {
1966: my $self = shift;
1967: my $id = shift;
1968:
1969: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1970: {
1971: return $self->{RESOURCE_CACHE}->{$id};
1972: }
1973:
1974: # resource handles inserting itself into cache.
1975: # Not clear why the quotes are necessary, but as of this
1976: # writing it doesn't work without them.
1977: return "Apache::lonnavmaps::resource"->new($self, $id);
1978: }
1979:
1980: sub getBySymb {
1981: my $self = shift;
1982: my $symb = shift;
1983: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1984: my $map = $self->getResourceByUrl($mapUrl);
1985: return $self->getById($map->map_pc() . '.' . $id);
1986: }
1987:
1988: sub getByMapPc {
1989: my $self = shift;
1990: my $map_pc = shift;
1991: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1992: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1993: return $self->getById($map_id);
1994: }
1995:
1996: =pod
1997:
1998: =item * B<firstResource>():
1999:
2000: Returns a resource object reference corresponding to the first
2001: resource in the navmap.
2002:
2003: =cut
2004:
2005: sub firstResource {
2006: my $self = shift;
2007: my $firstResource = $self->navhash('map_start_' .
2008: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2009: return $self->getById($firstResource);
2010: }
2011:
2012: =pod
2013:
2014: =item * B<finishResource>():
2015:
2016: Returns a resource object reference corresponding to the last resource
2017: in the navmap.
2018:
2019: =cut
2020:
2021: sub finishResource {
2022: my $self = shift;
2023: my $firstResource = $self->navhash('map_finish_' .
2024: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2025: return $self->getById($firstResource);
2026: }
2027:
2028: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2029: # the actual lookup; parmval caches the results.
2030: sub parmval {
2031: my $self = shift;
2032: my ($what,$symb)=@_;
2033: my $hashkey = $what."|||".$symb;
2034:
2035: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2036: return $self->{PARM_CACHE}->{$hashkey};
2037: }
2038:
2039: my $result = $self->parmval_real($what, $symb);
2040: $self->{PARM_CACHE}->{$hashkey} = $result;
2041: return $result;
2042: }
2043:
2044: sub parmval_real {
2045: my $self = shift;
2046: my ($what,$symb,$recurse) = @_;
2047:
2048: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2049: $self->generate_course_user_opt();
2050:
2051: my $cid=$ENV{'request.course.id'};
2052: my $csec=$ENV{'request.course.sec'};
2053: my $uname=$ENV{'user.name'};
2054: my $udom=$ENV{'user.domain'};
2055:
2056: unless ($symb) { return ''; }
2057: my $result='';
2058:
2059: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2060:
2061: # ----------------------------------------------------- Cascading lookup scheme
2062: my $rwhat=$what;
2063: $what=~s/^parameter\_//;
2064: $what=~s/\_/\./;
2065:
2066: my $symbparm=$symb.'.'.$what;
2067: my $mapparm=$mapname.'___(all).'.$what;
2068: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2069:
2070: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2071: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2072: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2073:
2074: my $courselevel= $usercourseprefix.'.'.$what;
2075: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2076: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2077:
2078: my $useropt = $self->{USER_OPT};
2079: my $courseopt = $self->{COURSE_OPT};
2080: my $parmhash = $self->{PARM_HASH};
2081:
2082: # ---------------------------------------------------------- first, check user
2083: if ($uname and defined($useropt)) {
2084: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2085: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2086: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2087: }
2088:
2089: # ------------------------------------------------------- second, check course
2090: if ($csec and defined($courseopt)) {
2091: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2092: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2093: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2094: }
2095:
2096: if (defined($courseopt)) {
2097: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2098: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2099: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2100: }
2101:
2102: # ----------------------------------------------------- third, check map parms
2103:
2104: my $thisparm=$$parmhash{$symbparm};
2105: if (defined($thisparm)) { return $thisparm; }
2106:
2107: # ----------------------------------------------------- fourth , check default
2108:
2109: my $meta_rwhat=$rwhat;
2110: $meta_rwhat=~s/\./_/g;
2111: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2112: if (defined($default)) { return $default}
2113: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2114: if (defined($default)) { return $default}
2115:
2116: # --------------------------------------------------- fifth , cascade up parts
2117:
2118: my ($space,@qualifier)=split(/\./,$rwhat);
2119: my $qualifier=join('.',@qualifier);
2120: unless ($space eq '0') {
2121: my @parts=split(/_/,$space);
2122: my $id=pop(@parts);
2123: my $part=join('_',@parts);
2124: if ($part eq '') { $part='0'; }
2125: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2126: if (defined($partgeneral)) { return $partgeneral; }
2127: }
2128: if ($recurse) { return undef; }
2129: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2130: if (defined($pack_def)) { return $pack_def; }
2131: return '';
2132: }
2133:
2134: =pod
2135:
2136: =item * B<getResourceByUrl>(url):
2137:
2138: Retrieves a resource object by URL of the resource. If passed a
2139: resource object, it will simply return it, so it is safe to use this
2140: method in code like "$res = $navmap->getResourceByUrl($res)", if
2141: you're not sure if $res is already an object, or just a URL. If the
2142: resource appears multiple times in the course, only the first instance
2143: will be returned. As a result, this is probably useful only for maps.
2144:
2145: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2146:
2147: The map is a specification of a map to retreive the resources from,
2148: either as a url or as an object. The filterFunc is a reference to a
2149: function that takes a resource object as its one argument and returns
2150: true if the resource should be included, or false if it should not
2151: be. If recursive is true, the map will be recursively examined,
2152: otherwise it will not be. If bailout is true, the function will return
2153: as soon as it finds a resource, if false it will finish. By default,
2154: the map is the top-level map of the course, filterFunc is a function
2155: that always returns 1, recursive is true, bailout is false. The
2156: resources will be returned in a list containing the resource objects
2157: for the corresponding resources, with B<no structure information> in
2158: the list; regardless of branching, recursion, etc., it will be a flat
2159: list.
2160:
2161: Thus, this is suitable for cases where you don't want the structure,
2162: just a list of all resources. It is also suitable for finding out how
2163: many resources match a given description; for this use, if all you
2164: want to know is if I<any> resources match the description, the bailout
2165: parameter will allow you to avoid potentially expensive enumeration of
2166: all matching resources.
2167:
2168: =item * B<hasResources>(map, filterFunc, recursive):
2169:
2170: Convience method for
2171:
2172: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2173:
2174: which will tell whether the map has resources matching the description
2175: in the filter function.
2176:
2177: =cut
2178:
2179: sub getResourceByUrl {
2180: my $self = shift;
2181: my $resUrl = shift;
2182:
2183: if (ref($resUrl)) { return $resUrl; }
2184:
2185: $resUrl = &Apache::lonnet::clutter($resUrl);
2186: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2187: if ($resId =~ /,/) {
2188: $resId = (split (/,/, $resId))[0];
2189: }
2190: if (!$resId) { return ''; }
2191: return $self->getById($resId);
2192: }
2193:
2194: sub retrieveResources {
2195: my $self = shift;
2196: my $map = shift;
2197: my $filterFunc = shift;
2198: if (!defined ($filterFunc)) {
2199: $filterFunc = sub {return 1;};
2200: }
2201: my $recursive = shift;
2202: if (!defined($recursive)) { $recursive = 1; }
2203: my $bailout = shift;
2204: if (!defined($bailout)) { $bailout = 0; }
2205:
2206: # Create the necessary iterator.
2207: if (!ref($map)) { # assume it's a url of a map.
2208: $map = $self->getResourceByUrl($map);
2209: }
2210:
2211: # If nothing was passed, assume top-level map
2212: if (!$map) {
2213: $map = $self->getById('0.0');
2214: }
2215:
2216: # Check the map's validity.
2217: if (!$map->is_map()) {
2218: # Oh, to throw an exception.... how I'd love that!
2219: return ();
2220: }
2221:
2222: # Get an iterator.
2223: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2224: undef, $recursive);
2225:
2226: my @resources = ();
2227:
2228: # Run down the iterator and collect the resources.
2229: my $curRes;
2230:
2231: while ($curRes = $it->next()) {
2232: if (ref($curRes)) {
2233: if (!&$filterFunc($curRes)) {
2234: next;
2235: }
2236:
2237: push @resources, $curRes;
2238:
2239: if ($bailout) {
2240: return @resources;
2241: }
2242: }
2243:
2244: }
2245:
2246: return @resources;
2247: }
2248:
2249: sub hasResource {
2250: my $self = shift;
2251: my $map = shift;
2252: my $filterFunc = shift;
2253: my $recursive = shift;
2254:
2255: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2256: }
2257:
2258: 1;
2259:
2260: package Apache::lonnavmaps::iterator;
2261:
2262: =pod
2263:
2264: =back
2265:
2266: =head1 Object: navmap Iterator
2267:
2268: An I<iterator> encapsulates the logic required to traverse a data
2269: structure. navmap uses an iterator to traverse the course map
2270: according to the criteria you wish to use.
2271:
2272: To obtain an iterator, call the B<getIterator>() function of a
2273: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2274: directly.) This will return a reference to the iterator:
2275:
2276: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2277:
2278: To get the next thing from the iterator, call B<next>:
2279:
2280: C<my $nextThing = $resourceIterator-E<gt>next()>
2281:
2282: getIterator behaves as follows:
2283:
2284: =over 4
2285:
2286: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2287:
2288: All parameters are optional. firstResource is a resource reference
2289: corresponding to where the iterator should start. It defaults to
2290: navmap->firstResource() for the corresponding nav map. finishResource
2291: corresponds to where you want the iterator to end, defaulting to
2292: navmap->finishResource(). filterHash is a hash used as a set
2293: containing strings representing the resource IDs, defaulting to
2294: empty. Condition is a 1 or 0 that sets what to do with the filter
2295: hash: If a 0, then only resources that exist IN the filterHash will be
2296: recursed on. If it is a 1, only resources NOT in the filterHash will
2297: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2298: false (default), the iterator will only return the first level of map
2299: that is not just a single, 'redirecting' map. If true, the iterator
2300: will return all information, starting with the top-level map,
2301: regardless of content. returnTopMap, if true (default false), will
2302: cause the iterator to return the top-level map object (resource 0.0)
2303: before anything else.
2304:
2305: Thus, by default, only top-level resources will be shown. Change the
2306: condition to a 1 without changing the hash, and all resources will be
2307: shown. Changing the condition to 1 and including some values in the
2308: hash will allow you to selectively suppress parts of the navmap, while
2309: leaving it on 0 and adding things to the hash will allow you to
2310: selectively add parts of the nav map. See the handler code for
2311: examples.
2312:
2313: The iterator will return either a reference to a resource object, or a
2314: token representing something in the map, such as the beginning of a
2315: new branch. The possible tokens are:
2316:
2317: =over 4
2318:
2319: =item * B<END_ITERATOR>:
2320:
2321: The iterator has returned all that it's going to. Further calls to the
2322: iterator will just produce more of these. This is a "false" value, and
2323: is the only false value the iterator which will be returned, so it can
2324: be used as a loop sentinel.
2325:
2326: =item * B<BEGIN_MAP>:
2327:
2328: A new map is being recursed into. This is returned I<after> the map
2329: resource itself is returned.
2330:
2331: =item * B<END_MAP>:
2332:
2333: The map is now done.
2334:
2335: =item * B<BEGIN_BRANCH>:
2336:
2337: A branch is now starting. The next resource returned will be the first
2338: in that branch.
2339:
2340: =item * B<END_BRANCH>:
2341:
2342: The branch is now done.
2343:
2344: =back
2345:
2346: The tokens are retreivable via methods on the iterator object, i.e.,
2347: $iterator->END_MAP.
2348:
2349: Maps can contain empty resources. The iterator will automatically skip
2350: over such resources, but will still treat the structure
2351: correctly. Thus, a complicated map with several branches, but
2352: consisting entirely of empty resources except for one beginning or
2353: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2354: but only one resource will be returned.
2355:
2356: =back
2357:
2358: =head2 Normal Usage
2359:
2360: Normal usage of the iterator object is to do the following:
2361:
2362: my $it = $navmap->getIterator([your params here]);
2363: my $curRes;
2364: while ($curRes = $it->next()) {
2365: [your logic here]
2366: }
2367:
2368: Note that inside of the loop, it's frequently useful to check if
2369: "$curRes" is a reference or not with the reference function; only
2370: resource objects will be references, and any non-references will
2371: be the tokens described above.
2372:
2373: Also note there is some old code floating around that trys to track
2374: the depth of the iterator to see when it's done; do not copy that
2375: code. It is difficult to get right and harder to understand then
2376: this. They should be migrated to this new style.
2377:
2378: =cut
2379:
2380: # Here are the tokens for the iterator:
2381:
2382: sub END_ITERATOR { return 0; }
2383: sub BEGIN_MAP { return 1; } # begining of a new map
2384: sub END_MAP { return 2; } # end of the map
2385: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2386: sub END_BRANCH { return 4; } # end of a branch
2387: sub FORWARD { return 1; } # go forward
2388: sub BACKWARD { return 2; }
2389:
2390: sub min {
2391: (my $a, my $b) = @_;
2392: if ($a < $b) { return $a; } else { return $b; }
2393: }
2394:
2395: sub new {
2396: # magic invocation to create a class instance
2397: my $proto = shift;
2398: my $class = ref($proto) || $proto;
2399: my $self = {};
2400:
2401: $self->{NAV_MAP} = shift;
2402: return undef unless ($self->{NAV_MAP});
2403:
2404: # Handle the parameters
2405: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2406: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2407:
2408: # If the given resources are just the ID of the resource, get the
2409: # objects
2410: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2411: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2412: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2413: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2414:
2415: $self->{FILTER} = shift;
2416:
2417: # A hash, used as a set, of resource already seen
2418: $self->{ALREADY_SEEN} = shift;
2419: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2420: $self->{CONDITION} = shift;
2421:
2422: # Do we want to automatically follow "redirection" maps?
2423: $self->{FORCE_TOP} = shift;
2424:
2425: # Do we want to return the top-level map object (resource 0.0)?
2426: $self->{RETURN_0} = shift;
2427: # have we done that yet?
2428: $self->{HAVE_RETURNED_0} = 0;
2429:
2430: # Now, we need to pre-process the map, by walking forward and backward
2431: # over the parts of the map we're going to look at.
2432:
2433: # The processing steps are exactly the same, except for a few small
2434: # changes, so I bundle those up in the following list of two elements:
2435: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2436: # first_resource).
2437: # This prevents writing nearly-identical code twice.
2438: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2439: 'FIRST_RESOURCE'],
2440: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2441: 'FINISH_RESOURCE'] );
2442:
2443: my $maxDepth = 0; # tracks max depth
2444:
2445: # If there is only one resource in this map, and it's a map, we
2446: # want to remember that, so the user can ask for the first map
2447: # that isn't just a redirector.
2448: my $resource; my $resourceCount = 0;
2449:
2450: # Documentation on this algorithm can be found in the CVS repository at
2451: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2452: # in that file.
2453: # **1**
2454:
2455: foreach my $pass (@iterations) {
2456: my $direction = $pass->[0];
2457: my $valName = $pass->[1];
2458: my $nextResourceMethod = $pass->[2];
2459: my $firstResourceName = $pass->[3];
2460:
2461: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2462: $self->{FIRST_RESOURCE},
2463: $self->{FINISH_RESOURCE},
2464: {}, undef, 0, $direction);
2465:
2466: # prime the recursion
2467: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2468: $iterator->next();
2469: my $curRes = $iterator->next();
2470: my $depth = 1;
2471: while ($depth > 0) {
2472: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2473: if ($curRes == $iterator->END_MAP()) { $depth--; }
2474:
2475: if (ref($curRes)) {
2476: # If there's only one resource, this will save it
2477: # we have to filter empty resources from consideration here,
2478: # or even "empty", redirecting maps have two (start & finish)
2479: # or three (start, finish, plus redirector)
2480: if($direction == FORWARD && $curRes->src()) {
2481: $resource = $curRes; $resourceCount++;
2482: }
2483: my $resultingVal = $curRes->{DATA}->{$valName};
2484: my $nextResources = $curRes->$nextResourceMethod();
2485: my $nextCount = scalar(@{$nextResources});
2486:
2487: if ($nextCount == 1) { # **3**
2488: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2489: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2490: }
2491:
2492: if ($nextCount > 1) { # **4**
2493: foreach my $res (@{$nextResources}) {
2494: my $current = $res->{DATA}->{$valName} || 999999999;
2495: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2496: }
2497: }
2498: }
2499:
2500: # Assign the final val (**2**)
2501: if (ref($curRes) && $direction == BACKWARD()) {
2502: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2503: $curRes->{DATA}->{BOT_UP_VAL});
2504:
2505: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2506: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2507: }
2508:
2509: $curRes = $iterator->next();
2510: }
2511: }
2512:
2513: # Check: Was this only one resource, a map?
2514: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2515: my $firstResource = $resource->map_start();
2516: my $finishResource = $resource->map_finish();
2517: return
2518: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2519: $finishResource, $self->{FILTER},
2520: $self->{ALREADY_SEEN},
2521: $self->{CONDITION}, 0);
2522:
2523: }
2524:
2525: # Set up some bookkeeping information.
2526: $self->{CURRENT_DEPTH} = 0;
2527: $self->{MAX_DEPTH} = $maxDepth;
2528: $self->{STACK} = [];
2529: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2530: $self->{FINISHED} = 0; # When true, the iterator has finished
2531:
2532: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2533: push @{$self->{STACK}}, [];
2534: }
2535:
2536: # Prime the recursion w/ the first resource **5**
2537: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2538: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2539:
2540: bless ($self);
2541:
2542: return $self;
2543: }
2544:
2545: sub next {
2546: my $self = shift;
2547:
2548: if ($self->{FINISHED}) {
2549: return END_ITERATOR();
2550: }
2551:
2552: # If we want to return the top-level map object, and haven't yet,
2553: # do so.
2554: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2555: $self->{HAVE_RETURNED_0} = 1;
2556: return $self->{NAV_MAP}->getById('0.0');
2557: }
2558:
2559: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2560: # grab the next from the recursive iterator
2561: my $next = $self->{RECURSIVE_ITERATOR}->next();
2562:
2563: # is it a begin or end map? If so, update the depth
2564: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2565: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2566:
2567: # Are we back at depth 0? If so, stop recursing
2568: if ($self->{RECURSIVE_DEPTH} == 0) {
2569: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2570: }
2571:
2572: return $next;
2573: }
2574:
2575: if (defined($self->{FORCE_NEXT})) {
2576: my $tmp = $self->{FORCE_NEXT};
2577: $self->{FORCE_NEXT} = undef;
2578: return $tmp;
2579: }
2580:
2581: # Have we not yet begun? If not, return BEGIN_MAP and
2582: # remember we've started.
2583: if ( !$self->{STARTED} ) {
2584: $self->{STARTED} = 1;
2585: return $self->BEGIN_MAP();
2586: }
2587:
2588: # Here's the guts of the iterator.
2589:
2590: # Find the next resource, if any.
2591: my $found = 0;
2592: my $i = $self->{MAX_DEPTH};
2593: my $newDepth;
2594: my $here;
2595: while ( $i >= 0 && !$found ) {
2596: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2597: $here = pop @{$self->{STACK}->[$i]}; # **7**
2598: $found = 1;
2599: $newDepth = $i;
2600: }
2601: $i--;
2602: }
2603:
2604: # If we still didn't find anything, we're done.
2605: if ( !$found ) {
2606: # We need to get back down to the correct branch depth
2607: if ( $self->{CURRENT_DEPTH} > 0 ) {
2608: $self->{CURRENT_DEPTH}--;
2609: return END_BRANCH();
2610: } else {
2611: $self->{FINISHED} = 1;
2612: return END_MAP();
2613: }
2614: }
2615:
2616: # If this is not a resource, it must be an END_BRANCH marker we want
2617: # to return directly.
2618: if (!ref($here)) { # **8**
2619: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2620: $self->{CURRENT_DEPTH}--;
2621: return $here;
2622: }
2623: }
2624:
2625: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2626: $self->{HERE} = $here;
2627:
2628: # Get to the right level
2629: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2630: push @{$self->{STACK}->[$newDepth]}, $here;
2631: $self->{CURRENT_DEPTH}--;
2632: return END_BRANCH();
2633: }
2634: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2635: push @{$self->{STACK}->[$newDepth]}, $here;
2636: $self->{CURRENT_DEPTH}++;
2637: return BEGIN_BRANCH();
2638: }
2639:
2640: # If we made it here, we have the next resource, and we're at the
2641: # right branch level. So let's examine the resource for where
2642: # we can get to from here.
2643:
2644: # So we need to look at all the resources we can get to from here,
2645: # categorize them if we haven't seen them, remember if we have a new
2646: my $nextUnfiltered = $here->getNext();
2647: my $maxDepthAdded = -1;
2648:
2649: for (@$nextUnfiltered) {
2650: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2651: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2652: push @{$self->{STACK}->[$depth]}, $_;
2653: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2654: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2655: }
2656: }
2657:
2658: # Is this the end of a branch? If so, all of the resources examined above
2659: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2660: # marker onto the stack so we don't forget.
2661: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2662: # BC branch and gets to C, it will see F as the only next resource, but it's
2663: # one level lower. Thus, this is the end of the branch, since there are no
2664: # more resources added to this level or above.
2665: # We don't do this if the examined resource is the finish resource,
2666: # because the condition given above is true, but the "END_MAP" will
2667: # take care of things and we should already be at depth 0.
2668: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2669: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2670: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2671: }
2672:
2673: # That ends the main iterator logic. Now, do we want to recurse
2674: # down this map (if this resource is a map)?
2675: if ($self->{HERE}->is_map() &&
2676: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2677: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2678: my $firstResource = $self->{HERE}->map_start();
2679: my $finishResource = $self->{HERE}->map_finish();
2680:
2681: $self->{RECURSIVE_ITERATOR} =
2682: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2683: $finishResource, $self->{FILTER},
2684: $self->{ALREADY_SEEN}, $self->{CONDITION});
2685: }
2686:
2687: # If this is a blank resource, don't actually return it.
2688: # Should you ever find you need it, make sure to add an option to the code
2689: # that you can use; other things depend on this behavior.
2690: my $browsePriv = $self->{HERE}->browsePriv();
2691: if (!$self->{HERE}->src() ||
2692: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2693: return $self->next();
2694: }
2695:
2696: return $self->{HERE};
2697:
2698: }
2699:
2700: =pod
2701:
2702: The other method available on the iterator is B<getStack>, which
2703: returns an array populated with the current 'stack' of maps, as
2704: references to the resource objects. Example: This is useful when
2705: making the navigation map, as we need to check whether we are under a
2706: page map to see if we need to link directly to the resource, or to the
2707: page. The first elements in the array will correspond to the top of
2708: the stack (most inclusive map).
2709:
2710: =cut
2711:
2712: sub getStack {
2713: my $self=shift;
2714:
2715: my @stack;
2716:
2717: $self->populateStack(\@stack);
2718:
2719: return \@stack;
2720: }
2721:
2722: # Private method: Calls the iterators recursively to populate the stack.
2723: sub populateStack {
2724: my $self=shift;
2725: my $stack = shift;
2726:
2727: push @$stack, $self->{HERE} if ($self->{HERE});
2728:
2729: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2730: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2731: }
2732: }
2733:
2734: 1;
2735:
2736: package Apache::lonnavmaps::DFSiterator;
2737:
2738: # Not documented in the perldoc: This is a simple iterator that just walks
2739: # through the nav map and presents the resources in a depth-first search
2740: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2741: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2742: # useful for pre-processing of some kind, and is in fact used by the main
2743: # iterator that way, but that's about it.
2744: # One could imagine merging this into the init routine of the main iterator,
2745: # but this might as well be left seperate, since it is possible some other
2746: # use might be found for it. - Jeremy
2747:
2748: # Unlike the main iterator, this DOES return all resources, even blank ones.
2749: # The main iterator needs them to correctly preprocess the map.
2750:
2751: sub BEGIN_MAP { return 1; } # begining of a new map
2752: sub END_MAP { return 2; } # end of the map
2753: sub FORWARD { return 1; } # go forward
2754: sub BACKWARD { return 2; }
2755:
2756: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2757: # filter hash ref (or undef), already seen hash or undef, condition
2758: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2759: sub new {
2760: # magic invocation to create a class instance
2761: my $proto = shift;
2762: my $class = ref($proto) || $proto;
2763: my $self = {};
2764:
2765: $self->{NAV_MAP} = shift;
2766: return undef unless ($self->{NAV_MAP});
2767:
2768: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2769: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2770:
2771: # If the given resources are just the ID of the resource, get the
2772: # objects
2773: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2774: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2775: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2776: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2777:
2778: $self->{FILTER} = shift;
2779:
2780: # A hash, used as a set, of resource already seen
2781: $self->{ALREADY_SEEN} = shift;
2782: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2783: $self->{CONDITION} = shift;
2784: $self->{DIRECTION} = shift || FORWARD();
2785:
2786: # Flag: Have we started yet?
2787: $self->{STARTED} = 0;
2788:
2789: # Should we continue calling the recursive iterator, if any?
2790: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2791: # The recursive iterator, if any
2792: $self->{RECURSIVE_ITERATOR} = undef;
2793: # Are we recursing on a map, or a branch?
2794: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2795: # And the count of how deep it is, so that this iterator can keep track of
2796: # when to pick back up again.
2797: $self->{RECURSIVE_DEPTH} = 0;
2798:
2799: # For keeping track of our branches, we maintain our own stack
2800: $self->{STACK} = [];
2801:
2802: # Start with the first resource
2803: if ($self->{DIRECTION} == FORWARD) {
2804: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2805: } else {
2806: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2807: }
2808:
2809: bless($self);
2810: return $self;
2811: }
2812:
2813: sub next {
2814: my $self = shift;
2815:
2816: # Are we using a recursive iterator? If so, pull from that and
2817: # watch the depth; we want to resume our level at the correct time.
2818: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2819: # grab the next from the recursive iterator
2820: my $next = $self->{RECURSIVE_ITERATOR}->next();
2821:
2822: # is it a begin or end map? Update depth if so
2823: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2824: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2825:
2826: # Are we back at depth 0? If so, stop recursing.
2827: if ($self->{RECURSIVE_DEPTH} == 0) {
2828: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2829: }
2830:
2831: return $next;
2832: }
2833:
2834: # Is there a current resource to grab? If not, then return
2835: # END_MAP, which will end the iterator.
2836: if (scalar(@{$self->{STACK}}) == 0) {
2837: return $self->END_MAP();
2838: }
2839:
2840: # Have we not yet begun? If not, return BEGIN_MAP and
2841: # remember that we've started.
2842: if ( !$self->{STARTED} ) {
2843: $self->{STARTED} = 1;
2844: return $self->BEGIN_MAP;
2845: }
2846:
2847: # Get the next resource in the branch
2848: $self->{HERE} = pop @{$self->{STACK}};
2849:
2850: # remember that we've seen this, so we don't return it again later
2851: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2852:
2853: # Get the next possible resources
2854: my $nextUnfiltered;
2855: if ($self->{DIRECTION} == FORWARD()) {
2856: $nextUnfiltered = $self->{HERE}->getNext();
2857: } else {
2858: $nextUnfiltered = $self->{HERE}->getPrevious();
2859: }
2860: my $next = [];
2861:
2862: # filter the next possibilities to remove things we've
2863: # already seen.
2864: foreach (@$nextUnfiltered) {
2865: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2866: push @$next, $_;
2867: }
2868: }
2869:
2870: while (@$next) {
2871: # copy the next possibilities over to the stack
2872: push @{$self->{STACK}}, shift @$next;
2873: }
2874:
2875: # If this is a map and we want to recurse down it... (not filtered out)
2876: if ($self->{HERE}->is_map() &&
2877: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2878: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2879: my $firstResource = $self->{HERE}->map_start();
2880: my $finishResource = $self->{HERE}->map_finish();
2881:
2882: $self->{RECURSIVE_ITERATOR} =
2883: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2884: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2885: $self->{CONDITION}, $self->{DIRECTION});
2886: }
2887:
2888: return $self->{HERE};
2889: }
2890:
2891: # Identical to the full iterator methods of the same name. Hate to copy/paste
2892: # but I also hate to "inherit" either iterator from the other.
2893:
2894: sub getStack {
2895: my $self=shift;
2896:
2897: my @stack;
2898:
2899: $self->populateStack(\@stack);
2900:
2901: return \@stack;
2902: }
2903:
2904: # Private method: Calls the iterators recursively to populate the stack.
2905: sub populateStack {
2906: my $self=shift;
2907: my $stack = shift;
2908:
2909: push @$stack, $self->{HERE} if ($self->{HERE});
2910:
2911: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2912: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2913: }
2914: }
2915:
2916: 1;
2917:
2918: package Apache::lonnavmaps::resource;
2919:
2920: use Apache::lonnet;
2921:
2922: =pod
2923:
2924: =head1 Object: resource
2925:
2926: X<resource, navmap object>
2927: A resource object encapsulates a resource in a resource map, allowing
2928: easy manipulation of the resource, querying the properties of the
2929: resource (including user properties), and represents a reference that
2930: can be used as the canonical representation of the resource by
2931: lonnavmap clients like renderers.
2932:
2933: A resource only makes sense in the context of a navmap, as some of the
2934: data is stored in the navmap object.
2935:
2936: You will probably never need to instantiate this object directly. Use
2937: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2938: starting resource.
2939:
2940: Resource objects respect the parameter_hiddenparts, which suppresses
2941: various parts according to the wishes of the map author. As of this
2942: writing, there is no way to override this parameter, and suppressed
2943: parts will never be returned, nor will their response types or ids be
2944: stored.
2945:
2946: =head2 Overview
2947:
2948: A B<Resource> is the most granular type of object in LON-CAPA that can
2949: be included in a course. It can either be a particular resource, like
2950: an HTML page, external resource, problem, etc., or it can be a
2951: container sequence, such as a "page" or a "map".
2952:
2953: To see a sequence from the user's point of view, please see the
2954: B<Creating a Course: Maps and Sequences> chapter of the Author's
2955: Manual.
2956:
2957: A Resource Object, once obtained from a navmap object via a B<getBy*>
2958: method of the navmap, or from an iterator, allows you to query
2959: information about that resource.
2960:
2961: Generally, you do not ever want to create a resource object yourself,
2962: so creation has been left undocumented. Always retrieve resources
2963: from navmap objects.
2964:
2965: =head3 Identifying Resources
2966:
2967: X<big hash>Every resource is identified by a Resource ID in the big hash that is
2968: unique to that resource for a given course. X<resource ID, in big hash>
2969: The Resource ID has the form #.#, where the first number is the same
2970: for every resource in a map, and the second is unique. For instance,
2971: for a course laid out like this:
2972:
2973: * Problem 1
2974: * Map
2975: * Resource 2
2976: * Resource 3
2977:
2978: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
2979: C<Resource 3> will share a first number. The second number may end up
2980: re-used between the two groups.
2981:
2982: The resource ID is only used in the big hash, but can be used in the
2983: context of a course to identify a resource easily. (For instance, the
2984: printing system uses it to record which resources from a sequence you
2985: wish to print.)
2986:
2987: X<symb> X<resource, symb>
2988: All resources also have B<symb>s, which uniquely identify a resource
2989: in a course. Many internal LON-CAPA functions expect a symb. A symb
2990: carries along with it the URL of the resource, and the map it appears
2991: in. Symbs are much larger then resource IDs.
2992:
2993: =cut
2994:
2995: sub new {
2996: # magic invocation to create a class instance
2997: my $proto = shift;
2998: my $class = ref($proto) || $proto;
2999: my $self = {};
3000:
3001: $self->{NAV_MAP} = shift;
3002: $self->{ID} = shift;
3003:
3004: # Store this new resource in the parent nav map's cache.
3005: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3006: $self->{RESOURCE_ERROR} = 0;
3007:
3008: # A hash that can be used by two-pass algorithms to store data
3009: # about this resource in. Not used by the resource object
3010: # directly.
3011: $self->{DATA} = {};
3012:
3013: bless($self);
3014:
3015: return $self;
3016: }
3017:
3018: # private function: simplify the NAV_HASH lookups we keep doing
3019: # pass the name, and to automatically append my ID, pass a true val on the
3020: # second param
3021: sub navHash {
3022: my $self = shift;
3023: my $param = shift;
3024: my $id = shift;
3025: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3026: }
3027:
3028: =pod
3029:
3030: =head2 Methods
3031:
3032: Once you have a resource object, here's what you can do with it:
3033:
3034: =head3 Attribute Retrieval
3035:
3036: Every resource has certain attributes that can be retrieved and used:
3037:
3038: =over 4
3039:
3040: =item * B<ID>: Every resource has an ID that is unique for that
3041: resource in the course it is in. The ID is actually in the hash
3042: representing the resource, so for a resource object $res, obtain
3043: it via C<$res->{ID}).
3044:
3045: =item * B<compTitle>:
3046:
3047: Returns a "composite title", that is equal to $res->title() if the
3048: resource has a title, and is otherwise the last part of the URL (e.g.,
3049: "problem.problem").
3050:
3051: =item * B<ext>:
3052:
3053: Returns true if the resource is external.
3054:
3055: =item * B<kind>:
3056:
3057: Returns the kind of the resource from the compiled nav map.
3058:
3059: =item * B<randomout>:
3060:
3061: Returns true if this resource was chosen to NOT be shown to the user
3062: by the random map selection feature. In other words, this is usually
3063: false.
3064:
3065: =item * B<randompick>:
3066:
3067: Returns true for a map if the randompick feature is being used on the
3068: map. (?)
3069:
3070: =item * B<src>:
3071:
3072: Returns the source for the resource.
3073:
3074: =item * B<symb>:
3075:
3076: Returns the symb for the resource.
3077:
3078: =item * B<title>:
3079:
3080: Returns the title of the resource.
3081:
3082: =back
3083:
3084: =cut
3085:
3086: # These info functions can be used directly, as they don't return
3087: # resource information.
3088: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3089: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3090: sub from { my $self=shift; return $self->navHash("from_", 1); }
3091: # considered private and undocumented
3092: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3093: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3094: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3095: sub randompick {
3096: my $self = shift;
3097: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3098: '.0.parameter_randompick'};
3099: }
3100: sub src {
3101: my $self=shift;
3102: return $self->navHash("src_", 1);
3103: }
3104: sub symb {
3105: my $self=shift;
3106: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3107: my $symbSrc = &Apache::lonnet::declutter($self->src());
3108: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3109: . '___' . $second . '___' . $symbSrc;
3110: return &Apache::lonnet::symbclean($symb);
3111: }
3112: sub title {
3113: my $self=shift;
3114: if ($self->{ID} eq '0.0') {
3115: # If this is the top-level map, return the title of the course
3116: # since this map can not be titled otherwise.
3117: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3118: }
3119: return $self->navHash("title_", 1); }
3120: # considered private and undocumented
3121: sub to { my $self=shift; return $self->navHash("to_", 1); }
3122: sub compTitle {
3123: my $self = shift;
3124: my $title = $self->title();
3125: $title=~s/\&colon\;/\:/gs;
3126: if (!$title) {
3127: $title = $self->src();
3128: $title = substr($title, rindex($title, '/') + 1);
3129: }
3130: return $title;
3131: }
3132: =pod
3133:
3134: B<Predicate Testing the Resource>
3135:
3136: These methods are shortcuts to deciding if a given resource has a given property.
3137:
3138: =over 4
3139:
3140: =item * B<is_map>:
3141:
3142: Returns true if the resource is a map type.
3143:
3144: =item * B<is_problem>:
3145:
3146: Returns true if the resource is a problem type, false
3147: otherwise. (Looks at the extension on the src field; might need more
3148: to work correctly.)
3149:
3150: =item * B<is_page>:
3151:
3152: Returns true if the resource is a page.
3153:
3154: =item * B<is_sequence>:
3155:
3156: Returns true if the resource is a sequence.
3157:
3158: =back
3159:
3160: =cut
3161:
3162:
3163: sub is_html {
3164: my $self=shift;
3165: my $src = $self->src();
3166: return ($src =~ /html$/);
3167: }
3168: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3169: sub is_page {
3170: my $self=shift;
3171: my $src = $self->src();
3172: return $self->navHash("is_map_", 1) &&
3173: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3174: }
3175: sub is_problem {
3176: my $self=shift;
3177: my $src = $self->src();
3178: return ($src =~ /problem$/);
3179: }
3180: sub is_sequence {
3181: my $self=shift;
3182: my $src = $self->src();
3183: return $self->navHash("is_map_", 1) &&
3184: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3185: }
3186:
3187: # Private method: Shells out to the parmval in the nav map, handler parts.
3188: sub parmval {
3189: my $self = shift;
3190: my $what = shift;
3191: my $part = shift;
3192: if (!defined($part)) {
3193: $part = '0';
3194: }
3195: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3196: }
3197:
3198: =pod
3199:
3200: B<Map Methods>
3201:
3202: These methods are useful for getting information about the map
3203: properties of the resource, if the resource is a map (B<is_map>).
3204:
3205: =over 4
3206:
3207: =item * B<map_finish>:
3208:
3209: Returns a reference to a resource object corresponding to the finish
3210: resource of the map.
3211:
3212: =item * B<map_pc>:
3213:
3214: Returns the pc value of the map, which is the first number that
3215: appears in the resource ID of the resources in the map, and is the
3216: number that appears around the middle of the symbs of the resources in
3217: that map.
3218:
3219: =item * B<map_start>:
3220:
3221: Returns a reference to a resource object corresponding to the start
3222: resource of the map.
3223:
3224: =item * B<map_type>:
3225:
3226: Returns a string with the type of the map in it.
3227:
3228: =back
3229:
3230: =cut
3231:
3232: sub map_finish {
3233: my $self = shift;
3234: my $src = $self->src();
3235: $src = Apache::lonnet::clutter($src);
3236: my $res = $self->navHash("map_finish_$src", 0);
3237: $res = $self->{NAV_MAP}->getById($res);
3238: return $res;
3239: }
3240: sub map_pc {
3241: my $self = shift;
3242: my $src = $self->src();
3243: return $self->navHash("map_pc_$src", 0);
3244: }
3245: sub map_start {
3246: my $self = shift;
3247: my $src = $self->src();
3248: $src = Apache::lonnet::clutter($src);
3249: my $res = $self->navHash("map_start_$src", 0);
3250: $res = $self->{NAV_MAP}->getById($res);
3251: return $res;
3252: }
3253: sub map_type {
3254: my $self = shift;
3255: my $pc = $self->map_pc();
3256: return $self->navHash("map_type_$pc", 0);
3257: }
3258:
3259: #####
3260: # Property queries
3261: #####
3262:
3263: # These functions will be responsible for returning the CORRECT
3264: # VALUE for the parameter, no matter what. So while they may look
3265: # like direct calls to parmval, they can be more then that.
3266: # So, for instance, the duedate function should use the "duedatetype"
3267: # information, rather then the resource object user.
3268:
3269: =pod
3270:
3271: =head2 Resource Parameters
3272:
3273: In order to use the resource parameters correctly, the nav map must
3274: have been instantiated with genCourseAndUserOptions set to true, so
3275: the courseopt and useropt is read correctly. Then, you can call these
3276: functions to get the relevant parameters for the resource. Each
3277: function defaults to part "0", but can be directed to another part by
3278: passing the part as the parameter.
3279:
3280: These methods are responsible for getting the parameter correct, not
3281: merely reflecting the contents of the GDBM hashes. As we move towards
3282: dates relative to other dates, these methods should be updated to
3283: reflect that. (Then, anybody using these methods will not have to update
3284: their code.)
3285:
3286: =over 4
3287:
3288: =item * B<acc>:
3289:
3290: Get the Client IP/Name Access Control information.
3291:
3292: =item * B<answerdate>:
3293:
3294: Get the answer-reveal date for the problem.
3295:
3296: =item * B<awarded>:
3297:
3298: Gets the awarded value for the problem part. Requires genUserData set to
3299: true when the navmap object was created.
3300:
3301: =item * B<duedate>:
3302:
3303: Get the due date for the problem.
3304:
3305: =item * B<tries>:
3306:
3307: Get the number of tries the student has used on the problem.
3308:
3309: =item * B<maxtries>:
3310:
3311: Get the number of max tries allowed.
3312:
3313: =item * B<opendate>:
3314:
3315: Get the open date for the problem.
3316:
3317: =item * B<sig>:
3318:
3319: Get the significant figures setting.
3320:
3321: =item * B<tol>:
3322:
3323: Get the tolerance for the problem.
3324:
3325: =item * B<tries>:
3326:
3327: Get the number of tries the user has already used on the problem.
3328:
3329: =item * B<type>:
3330:
3331: Get the question type for the problem.
3332:
3333: =item * B<weight>:
3334:
3335: Get the weight for the problem.
3336:
3337: =back
3338:
3339: =cut
3340:
3341: sub acc {
3342: (my $self, my $part) = @_;
3343: return $self->parmval("acc", $part);
3344: }
3345: sub answerdate {
3346: (my $self, my $part) = @_;
3347: # Handle intervals
3348: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3349: return $self->duedate($part) +
3350: $self->parmval("answerdate", $part);
3351: }
3352: return $self->parmval("answerdate", $part);
3353: }
3354: sub awarded {
3355: my $self = shift; my $part = shift;
3356: $self->{NAV_MAP}->get_user_data();
3357: if (!defined($part)) { $part = '0'; }
3358: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3359: }
3360: sub duedate {
3361: (my $self, my $part) = @_;
3362: return $self->parmval("duedate", $part);
3363: }
3364: sub maxtries {
3365: (my $self, my $part) = @_;
3366: return $self->parmval("maxtries", $part);
3367: }
3368: sub opendate {
3369: (my $self, my $part) = @_;
3370: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3371: return $self->duedate($part) -
3372: $self->parmval("opendate", $part);
3373: }
3374: return $self->parmval("opendate");
3375: }
3376: sub problemstatus {
3377: (my $self, my $part) = @_;
3378: return lc $self->parmval("problemstatus", $part);
3379: }
3380: sub sig {
3381: (my $self, my $part) = @_;
3382: return $self->parmval("sig", $part);
3383: }
3384: sub tol {
3385: (my $self, my $part) = @_;
3386: return $self->parmval("tol", $part);
3387: }
3388: sub tries {
3389: my $self = shift;
3390: my $tries = $self->queryRestoreHash('tries', shift);
3391: if (!defined($tries)) { return '0';}
3392: return $tries;
3393: }
3394: sub type {
3395: (my $self, my $part) = @_;
3396: return $self->parmval("type", $part);
3397: }
3398: sub weight {
3399: my $self = shift; my $part = shift;
3400: if (!defined($part)) { $part = '0'; }
3401: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3402: $self->symb(), $ENV{'user.domain'},
3403: $ENV{'user.name'},
3404: $ENV{'request.course.sec'});
3405:
3406: }
3407:
3408: # Multiple things need this
3409: sub getReturnHash {
3410: my $self = shift;
3411:
3412: if (!defined($self->{RETURN_HASH})) {
3413: my %tmpHash = &Apache::lonnet::restore($self->symb());
3414: $self->{RETURN_HASH} = \%tmpHash;
3415: }
3416: }
3417:
3418: ######
3419: # Status queries
3420: ######
3421:
3422: # These methods query the status of problems.
3423:
3424: # If we need to count parts, this function determines the number of
3425: # parts from the metadata. When called, it returns a reference to a list
3426: # of strings corresponding to the parts. (Thus, using it in a scalar context
3427: # tells you how many parts you have in the problem:
3428: # $partcount = scalar($resource->countParts());
3429: # Don't use $self->{PARTS} directly because you don't know if it's been
3430: # computed yet.
3431:
3432: =pod
3433:
3434: =head2 Resource misc
3435:
3436: Misc. functions for the resource.
3437:
3438: =over 4
3439:
3440: =item * B<hasDiscussion>:
3441:
3442: Returns a false value if there has been discussion since the user last
3443: logged in, true if there has. Always returns false if the discussion
3444: data was not extracted when the nav map was constructed.
3445:
3446: =item * B<getFeedback>:
3447:
3448: Gets the feedback for the resource and returns the raw feedback string
3449: for the resource, or the null string if there is no feedback or the
3450: email data was not extracted when the nav map was constructed. Usually
3451: used like this:
3452:
3453: for (split(/\,/, $res->getFeedback())) {
3454: my $link = &Apache::lonnet::escape($_);
3455: ...
3456:
3457: and use the link as appropriate.
3458:
3459: =cut
3460:
3461: sub hasDiscussion {
3462: my $self = shift;
3463: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3464: }
3465:
3466: sub getFeedback {
3467: my $self = shift;
3468: my $source = $self->src();
3469: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3470: return $self->{NAV_MAP}->getFeedback($source);
3471: }
3472:
3473: sub getErrors {
3474: my $self = shift;
3475: my $source = $self->src();
3476: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3477: return $self->{NAV_MAP}->getErrors($source);
3478: }
3479:
3480: =pod
3481:
3482: =item * B<parts>():
3483:
3484: Returns a list reference containing sorted strings corresponding to
3485: each part of the problem. Single part problems have only a part '0'.
3486: Multipart problems do not return their part '0', since they typically
3487: do not really matter.
3488:
3489: =item * B<countParts>():
3490:
3491: Returns the number of parts of the problem a student can answer. Thus,
3492: for single part problems, returns 1. For multipart, it returns the
3493: number of parts in the problem, not including psuedo-part 0.
3494:
3495: =item * B<multipart>():
3496:
3497: Returns true if the problem is multipart, false otherwise. Use this instead
3498: of countParts if all you want is multipart/not multipart.
3499:
3500: =item * B<responseType>($part):
3501:
3502: Returns the response type of the part, without the word "response" on the
3503: end. Example return values: 'string', 'essay', 'numeric', etc.
3504:
3505: =item * B<responseIds>($part):
3506:
3507: Retreives the response IDs for the given part as an array reference containing
3508: strings naming the response IDs. This may be empty.
3509:
3510: =back
3511:
3512: =cut
3513:
3514: sub parts {
3515: my $self = shift;
3516:
3517: if ($self->ext) { return []; }
3518:
3519: $self->extractParts();
3520: return $self->{PARTS};
3521: }
3522:
3523: sub countParts {
3524: my $self = shift;
3525:
3526: my $parts = $self->parts();
3527:
3528: # If I left this here, then it's not necessary.
3529: #my $delta = 0;
3530: #for my $part (@$parts) {
3531: # if ($part eq '0') { $delta--; }
3532: #}
3533:
3534: if ($self->{RESOURCE_ERROR}) {
3535: return 0;
3536: }
3537:
3538: return scalar(@{$parts}); # + $delta;
3539: }
3540:
3541: sub multipart {
3542: my $self = shift;
3543: return $self->countParts() > 1;
3544: }
3545:
3546: sub singlepart {
3547: my $self = shift;
3548: return $self->countParts() == 1;
3549: }
3550:
3551: sub responseType {
3552: my $self = shift;
3553: my $part = shift;
3554:
3555: $self->extractParts();
3556: if (defined($self->{RESPONSE_TYPES}->{$part})) {
3557: return @{$self->{RESPONSE_TYPES}->{$part}};
3558: } else {
3559: return undef;
3560: }
3561: }
3562:
3563: sub responseIds {
3564: my $self = shift;
3565: my $part = shift;
3566:
3567: $self->extractParts();
3568: if (defined($self->{RESPONSE_IDS}->{$part})) {
3569: return @{$self->{RESPONSE_IDS}->{$part}};
3570: } else {
3571: return undef;
3572: }
3573: }
3574:
3575: # Private function: Extracts the parts information, both part names and
3576: # part types, and saves it.
3577: sub extractParts {
3578: my $self = shift;
3579:
3580: return if (defined($self->{PARTS}));
3581: return if ($self->ext);
3582:
3583: $self->{PARTS} = [];
3584:
3585: my %parts;
3586:
3587: # Retrieve part count, if this is a problem
3588: if ($self->is_problem()) {
3589: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
3590: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3591:
3592: if ($partorder) {
3593: my @parts;
3594: for my $part (split (/,/,$partorder)) {
3595: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3596: push @parts, $part;
3597: $parts{$part} = 1;
3598: }
3599: }
3600: $self->{PARTS} = \@parts;
3601: } else {
3602: if (!$metadata) {
3603: $self->{RESOURCE_ERROR} = 1;
3604: $self->{PARTS} = [];
3605: $self->{PART_TYPE} = {};
3606: return;
3607: }
3608: foreach (split(/\,/,$metadata)) {
3609: if ($_ =~ /^part_(.*)$/) {
3610: my $part = $1;
3611: # This floods the logs if it blows up
3612: if (defined($parts{$part})) {
3613: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3614: }
3615:
3616: # check to see if part is turned off.
3617:
3618: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3619: $parts{$part} = 1;
3620: }
3621: }
3622: }
3623: my @sortedParts = sort keys %parts;
3624: $self->{PARTS} = \@sortedParts;
3625: }
3626:
3627:
3628: my %responseIdHash;
3629: my %responseTypeHash;
3630:
3631:
3632: # Init the responseIdHash
3633: foreach (@{$self->{PARTS}}) {
3634: $responseIdHash{$_} = [];
3635: }
3636:
3637: # Now, the unfortunate thing about this is that parts, part name, and
3638: # response id are delimited by underscores, but both the part
3639: # name and response id can themselves have underscores in them.
3640: # So we have to use our knowlege of part names to figure out
3641: # where the part names begin and end, and even then, it is possible
3642: # to construct ambiguous situations.
3643: foreach (split /,/, $metadata) {
3644: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3645: my $responseType = $1;
3646: my $partStuff = $2;
3647: my $partIdSoFar = '';
3648: my @partChunks = split /_/, $partStuff;
3649: my $i = 0;
3650: for ($i = 0; $i < scalar(@partChunks); $i++) {
3651: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3652: $partIdSoFar .= $partChunks[$i];
3653: if ($parts{$partIdSoFar}) {
3654: my @otherChunks = @partChunks[$i+1..$#partChunks];
3655: my $responseId = join('_', @otherChunks);
3656: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3657: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
3658: }
3659: }
3660: }
3661: }
3662: $self->{RESPONSE_IDS} = \%responseIdHash;
3663: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3664: }
3665:
3666: return;
3667: }
3668:
3669: =pod
3670:
3671: =head2 Resource Status
3672:
3673: Problem resources have status information, reflecting their various
3674: dates and completion statuses.
3675:
3676: There are two aspects to the status: the date-related information and
3677: the completion information.
3678:
3679: Idiomatic usage of these two methods would probably look something
3680: like
3681:
3682: foreach ($resource->parts()) {
3683: my $dateStatus = $resource->getDateStatus($_);
3684: my $completionStatus = $resource->getCompletionStatus($_);
3685:
3686: or
3687:
3688: my $status = $resource->status($_);
3689:
3690: ... use it here ...
3691: }
3692:
3693: Which you use depends on exactly what you are looking for. The
3694: status() function has been optimized for the nav maps display and may
3695: not precisely match what you need elsewhere.
3696:
3697: The symbolic constants shown below can be accessed through the
3698: resource object: C<$res->OPEN>.
3699:
3700: =over 4
3701:
3702: =item * B<getDateStatus>($part):
3703:
3704: ($part defaults to 0). A convenience function that returns a symbolic
3705: constant telling you about the date status of the part. The possible
3706: return values are:
3707:
3708: =back
3709:
3710: B<Date Codes>
3711:
3712: =over 4
3713:
3714: =item * B<OPEN_LATER>:
3715:
3716: The problem will be opened later.
3717:
3718: =item * B<OPEN>:
3719:
3720: Open and not yet due.
3721:
3722:
3723: =item * B<PAST_DUE_ANSWER_LATER>:
3724:
3725: The due date has passed, but the answer date has not yet arrived.
3726:
3727: =item * B<PAST_DUE_NO_ANSWER>:
3728:
3729: The due date has passed and there is no answer opening date set.
3730:
3731: =item * B<ANSWER_OPEN>:
3732:
3733: The answer date is here.
3734:
3735: =item * B<NETWORK_FAILURE>:
3736:
3737: The information is unknown due to network failure.
3738:
3739: =back
3740:
3741: =cut
3742:
3743: # Apparently the compiler optimizes these into constants automatically
3744: sub OPEN_LATER { return 0; }
3745: sub OPEN { return 1; }
3746: sub PAST_DUE_NO_ANSWER { return 2; }
3747: sub PAST_DUE_ANSWER_LATER { return 3; }
3748: sub ANSWER_OPEN { return 4; }
3749: sub NOTHING_SET { return 5; }
3750: sub NETWORK_FAILURE { return 100; }
3751:
3752: # getDateStatus gets the date status for a given problem part.
3753: # Because answer date, due date, and open date are fully independent
3754: # (i.e., it is perfectly possible to *only* have an answer date),
3755: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3756: # (past, future, none given). This function handles this with a decision
3757: # tree. Read the comments to follow the decision tree.
3758:
3759: sub getDateStatus {
3760: my $self = shift;
3761: my $part = shift;
3762: $part = "0" if (!defined($part));
3763:
3764: # Always return network failure if there was one.
3765: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3766:
3767: my $now = time();
3768:
3769: my $open = $self->opendate($part);
3770: my $due = $self->duedate($part);
3771: my $answer = $self->answerdate($part);
3772:
3773: if (!$open && !$due && !$answer) {
3774: # no data on the problem at all
3775: # should this be the same as "open later"? think multipart.
3776: return $self->NOTHING_SET;
3777: }
3778: if (!$open || $now < $open) {return $self->OPEN_LATER}
3779: if (!$due || $now < $due) {return $self->OPEN}
3780: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3781: if ($answer) { return $self->ANSWER_OPEN; }
3782: return PAST_DUE_NO_ANSWER;
3783: }
3784:
3785: =pod
3786:
3787: B<>
3788:
3789: =over 4
3790:
3791: =item * B<getCompletionStatus>($part):
3792:
3793: ($part defaults to 0.) A convenience function that returns a symbolic
3794: constant telling you about the completion status of the part, with the
3795: following possible results:
3796:
3797: =back
3798:
3799: B<Completion Codes>
3800:
3801: =over 4
3802:
3803: =item * B<NOT_ATTEMPTED>:
3804:
3805: Has not been attempted at all.
3806:
3807: =item * B<INCORRECT>:
3808:
3809: Attempted, but wrong by student.
3810:
3811: =item * B<INCORRECT_BY_OVERRIDE>:
3812:
3813: Attempted, but wrong by instructor override.
3814:
3815: =item * B<CORRECT>:
3816:
3817: Correct or correct by instructor.
3818:
3819: =item * B<CORRECT_BY_OVERRIDE>:
3820:
3821: Correct by instructor override.
3822:
3823: =item * B<EXCUSED>:
3824:
3825: Excused. Not yet implemented.
3826:
3827: =item * B<NETWORK_FAILURE>:
3828:
3829: Information not available due to network failure.
3830:
3831: =item * B<ATTEMPTED>:
3832:
3833: Attempted, and not yet graded.
3834:
3835: =back
3836:
3837: =cut
3838:
3839: sub NOT_ATTEMPTED { return 10; }
3840: sub INCORRECT { return 11; }
3841: sub INCORRECT_BY_OVERRIDE { return 12; }
3842: sub CORRECT { return 13; }
3843: sub CORRECT_BY_OVERRIDE { return 14; }
3844: sub EXCUSED { return 15; }
3845: sub ATTEMPTED { return 16; }
3846:
3847: sub getCompletionStatus {
3848: my $self = shift;
3849: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3850:
3851: my $status = $self->queryRestoreHash('solved', shift);
3852:
3853: # Left as seperate if statements in case we ever do more with this
3854: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3855: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3856: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3857: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3858: if ($status eq 'excused') {return $self->EXCUSED; }
3859: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3860: return $self->NOT_ATTEMPTED;
3861: }
3862:
3863: sub queryRestoreHash {
3864: my $self = shift;
3865: my $hashentry = shift;
3866: my $part = shift;
3867: $part = "0" if (!defined($part) || $part eq '');
3868: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3869:
3870: $self->getReturnHash();
3871:
3872: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3873: }
3874:
3875: =pod
3876:
3877: B<Composite Status>
3878:
3879: Along with directly returning the date or completion status, the
3880: resource object includes a convenience function B<status>() that will
3881: combine the two status tidbits into one composite status that can
3882: represent the status of the resource as a whole. This method represents
3883: the concept of the thing we want to display to the user on the nav maps
3884: screen, which is a combination of completion and open status. The precise logic is
3885: documented in the comments of the status method. The following results
3886: may be returned, all available as methods on the resource object
3887: ($res->NETWORK_FAILURE): In addition to the return values that match
3888: the date or completion status, this function can return "ANSWER_SUBMITTED"
3889: if that problemstatus parameter value is set to No, suppressing the
3890: incorrect/correct feedback.
3891:
3892: =over 4
3893:
3894: =item * B<NETWORK_FAILURE>:
3895:
3896: The network has failed and the information is not available.
3897:
3898: =item * B<NOTHING_SET>:
3899:
3900: No dates have been set for this problem (part) at all. (Because only
3901: certain parts of a multi-part problem may be assigned, this can not be
3902: collapsed into "open later", as we do not know a given part will EVER
3903: be opened. For single part, this is the same as "OPEN_LATER".)
3904:
3905: =item * B<CORRECT>:
3906:
3907: For any reason at all, the part is considered correct.
3908:
3909: =item * B<EXCUSED>:
3910:
3911: For any reason at all, the problem is excused.
3912:
3913: =item * B<PAST_DUE_NO_ANSWER>:
3914:
3915: The problem is past due, not considered correct, and no answer date is
3916: set.
3917:
3918: =item * B<PAST_DUE_ANSWER_LATER>:
3919:
3920: The problem is past due, not considered correct, and an answer date in
3921: the future is set.
3922:
3923: =item * B<ANSWER_OPEN>:
3924:
3925: The problem is past due, not correct, and the answer is now available.
3926:
3927: =item * B<OPEN_LATER>:
3928:
3929: The problem is not yet open.
3930:
3931: =item * B<TRIES_LEFT>:
3932:
3933: The problem is open, has been tried, is not correct, but there are
3934: tries left.
3935:
3936: =item * B<INCORRECT>:
3937:
3938: The problem is open, and all tries have been used without getting the
3939: correct answer.
3940:
3941: =item * B<OPEN>:
3942:
3943: The item is open and not yet tried.
3944:
3945: =item * B<ATTEMPTED>:
3946:
3947: The problem has been attempted.
3948:
3949: =item * B<ANSWER_SUBMITTED>:
3950:
3951: An answer has been submitted, but the student should not see it.
3952:
3953: =back
3954:
3955: =cut
3956:
3957: sub TRIES_LEFT { return 20; }
3958: sub ANSWER_SUBMITTED { return 21; }
3959:
3960: sub status {
3961: my $self = shift;
3962: my $part = shift;
3963: if (!defined($part)) { $part = "0"; }
3964: my $completionStatus = $self->getCompletionStatus($part);
3965: my $dateStatus = $self->getDateStatus($part);
3966:
3967: # What we have is a two-dimensional matrix with 4 entries on one
3968: # dimension and 5 entries on the other, which we want to colorize,
3969: # plus network failure and "no date data at all".
3970:
3971: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
3972: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3973:
3974: my $suppressFeedback = $self->problemstatus($part) eq 'no';
3975: # If there's an answer date and we're past it, don't
3976: # suppress the feedback; student should know
3977: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
3978: $suppressFeedback = 0;
3979: }
3980:
3981: # There are a few whole rows we can dispose of:
3982: if ($completionStatus == CORRECT ||
3983: $completionStatus == CORRECT_BY_OVERRIDE ) {
3984: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
3985: }
3986:
3987: if ($completionStatus == ATTEMPTED) {
3988: return ATTEMPTED;
3989: }
3990:
3991: # If it's EXCUSED, then return that no matter what
3992: if ($completionStatus == EXCUSED) {
3993: return EXCUSED;
3994: }
3995:
3996: if ($dateStatus == NOTHING_SET) {
3997: return NOTHING_SET;
3998: }
3999:
4000: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4001: # by 4 matrix (date statuses).
4002:
4003: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4004: $dateStatus == PAST_DUE_NO_ANSWER ) {
4005: return $dateStatus;
4006: }
4007:
4008: if ($dateStatus == ANSWER_OPEN) {
4009: return ANSWER_OPEN;
4010: }
4011:
4012: # Now: (incorrect, incorrect_override, not_attempted) x
4013: # (open_later), (open)
4014:
4015: if ($dateStatus == OPEN_LATER) {
4016: return OPEN_LATER;
4017: }
4018:
4019: # If it's WRONG...
4020: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4021: # and there are TRIES LEFT:
4022: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4023: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4024: }
4025: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4026: }
4027:
4028: # Otherwise, it's untried and open
4029: return OPEN;
4030: }
4031:
4032: sub CLOSED { return 23; }
4033: sub ERROR { return 24; }
4034:
4035: =pod
4036:
4037: B<Simple Status>
4038:
4039: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4040: "Simple status" corresponds to "which icon is shown on the
4041: Navmaps". There are six "simple" statuses:
4042:
4043: =over 4
4044:
4045: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4046:
4047: =item * B<OPEN>: The problem is open and unattempted.
4048:
4049: =item * B<CORRECT>: The problem is correct for any reason.
4050:
4051: =item * B<INCORRECT>: The problem is incorrect and can still be
4052: completed successfully.
4053:
4054: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4055: does not know if they are correct. (The ellipsis icon.)
4056:
4057: =item * B<ERROR>: There is an error retrieving information about this
4058: problem.
4059:
4060: =back
4061:
4062: =cut
4063:
4064: # This hash maps the composite status to this simple status, and
4065: # can be used directly, if you like
4066: my %compositeToSimple =
4067: (
4068: NETWORK_FAILURE() => ERROR,
4069: NOTHING_SET() => CLOSED,
4070: CORRECT() => CORRECT,
4071: EXCUSED() => CORRECT,
4072: PAST_DUE_NO_ANSWER() => INCORRECT,
4073: PAST_DUE_ANSWER_LATER() => INCORRECT,
4074: ANSWER_OPEN() => INCORRECT,
4075: OPEN_LATER() => CLOSED,
4076: TRIES_LEFT() => OPEN,
4077: INCORRECT() => INCORRECT,
4078: OPEN() => OPEN,
4079: ATTEMPTED() => ATTEMPTED,
4080: ANSWER_SUBMITTED() => ATTEMPTED
4081: );
4082:
4083: sub simpleStatus {
4084: my $self = shift;
4085: my $part = shift;
4086: my $status = $self->status($part);
4087: return $compositeToSimple{$status};
4088: }
4089:
4090: =pod
4091:
4092: B<simpleStatusCount> will return an array reference containing, in
4093: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4094: and ERROR parts the given problem has.
4095:
4096: =cut
4097:
4098: # This maps the status to the slot we want to increment
4099: my %statusToSlotMap =
4100: (
4101: OPEN() => 0,
4102: CLOSED() => 1,
4103: CORRECT() => 2,
4104: INCORRECT() => 3,
4105: ATTEMPTED() => 4,
4106: ERROR() => 5
4107: );
4108:
4109: sub statusToSlot { return $statusToSlotMap{shift()}; }
4110:
4111: sub simpleStatusCount {
4112: my $self = shift;
4113:
4114: my @counts = (0, 0, 0, 0, 0, 0, 0);
4115: foreach my $part (@{$self->parts()}) {
4116: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4117: }
4118:
4119: return \@counts;
4120: }
4121:
4122: =pod
4123:
4124: B<Completable>
4125:
4126: The completable method represents the concept of I<whether the student can
4127: currently do the problem>. If the student can do the problem, which means
4128: that it is open, there are tries left, and if the problem is manually graded
4129: or the grade is suppressed via problemstatus, the student has not tried it
4130: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4131: either the student has tried it and there is no feedback, or that for
4132: some reason it is no longer completable (not open yet, successfully completed,
4133: out of tries, etc.). As an example, this is used as the filter for the
4134: "Uncompleted Homework" option for the nav maps.
4135:
4136: If this does not quite meet your needs, do not fiddle with it (unless you are
4137: fixing it to better match the student's conception of "completable" because
4138: it's broken somehow)... make a new method.
4139:
4140: =cut
4141:
4142: sub completable {
4143: my $self = shift;
4144: if (!$self->is_problem()) { return 0; }
4145: my $partCount = $self->countParts();
4146:
4147: foreach my $part (@{$self->parts()}) {
4148: if ($part eq '0' && $partCount != 1) { next; }
4149: my $status = $self->status($part);
4150: # "If any of the parts are open, or have tries left (implies open),
4151: # and it is not "attempted" (manually graded problem), it is
4152: # not "complete"
4153: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4154: $status == ANSWER_SUBMITTED() ) {
4155: # did this part already, as well as we can
4156: next;
4157: }
4158: if ($status == OPEN() || $status == TRIES_LEFT()) {
4159: return 1;
4160: }
4161: }
4162:
4163: # If all the parts were complete, so was this problem.
4164: return 0;
4165: }
4166:
4167: =pod
4168:
4169: =head2 Resource/Nav Map Navigation
4170:
4171: =over 4
4172:
4173: =item * B<getNext>():
4174:
4175: Retreive an array of the possible next resources after this
4176: one. Always returns an array, even in the one- or zero-element case.
4177:
4178: =item * B<getPrevious>():
4179:
4180: Retreive an array of the possible previous resources from this
4181: one. Always returns an array, even in the one- or zero-element case.
4182:
4183: =cut
4184:
4185: sub getNext {
4186: my $self = shift;
4187: my @branches;
4188: my $to = $self->to();
4189: foreach my $branch ( split(/,/, $to) ) {
4190: my $choice = $self->{NAV_MAP}->getById($branch);
4191: my $next = $choice->goesto();
4192: $next = $self->{NAV_MAP}->getById($next);
4193:
4194: push @branches, $next;
4195: }
4196: return \@branches;
4197: }
4198:
4199: sub getPrevious {
4200: my $self = shift;
4201: my @branches;
4202: my $from = $self->from();
4203: foreach my $branch ( split /,/, $from) {
4204: my $choice = $self->{NAV_MAP}->getById($branch);
4205: my $prev = $choice->comesfrom();
4206: $prev = $self->{NAV_MAP}->getById($prev);
4207:
4208: push @branches, $prev;
4209: }
4210: return \@branches;
4211: }
4212:
4213: sub browsePriv {
4214: my $self = shift;
4215: if (defined($self->{BROWSE_PRIV})) {
4216: return $self->{BROWSE_PRIV};
4217: }
4218:
4219: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4220: }
4221:
4222: =pod
4223:
4224: =back
4225:
4226: =cut
4227:
4228: 1;
4229:
4230: __END__
4231:
4232:
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