1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.261 2004/06/15 14:12:56 matthew 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 separates the logic of how to create
318: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
319: # etc.) into a separate 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 dueInLessThan24Hours {
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:
868: my $partLabel = "";
869: my $newBranchText = "";
870:
871: # If this is a new branch, label it so
872: if ($params->{'isNewBranch'}) {
873: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
874: }
875:
876: # links to open and close the folder
877: my $linkopen = "<a href='$link'>";
878: my $linkclose = "</a>";
879:
880: # Default icon: unknown page
881: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
882:
883: if ($resource->is_problem()) {
884: if ($part eq '0' || $params->{'condensed'}) {
885: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
886: } else {
887: $icon = $params->{'indentString'};
888: }
889: } else {
890: $icon = "<img src='".&Apache::loncommon::icon($resource->src).
891: "' alt='' border='0' />";
892: }
893:
894: # Display the correct map icon to open or shut map
895: if ($resource->is_map()) {
896: my $mapId = $resource->map_pc();
897: my $nowOpen = !defined($filter->{$mapId});
898: if ($it->{CONDITION}) {
899: $nowOpen = !$nowOpen;
900: }
901:
902: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
903:
904: if (!$params->{'resource_no_folder_link'}) {
905: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
906: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
907:
908: $linkopen = "<a href='" . $params->{'url'} . '?' .
909: $params->{'queryString'} . '&filter=';
910: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
911: addToFilter($filter, $mapId) :
912: removeFromFilter($filter, $mapId);
913: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
914: . $params->{'hereType'} . '&here=' .
915: &Apache::lonnet::escape($params->{'here'}) .
916: '&jump=' .
917: &Apache::lonnet::escape($resource->symb()) .
918: "&folderManip=1'>";
919: } else {
920: # Don't allow users to manipulate folder
921: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
922: '.nomanip.gif';
923: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
924:
925: $linkopen = "";
926: $linkclose = "";
927: }
928: }
929:
930: if ($resource->randomout()) {
931: $nonLinkedText .= ' <i>(hidden)</i> ';
932: }
933:
934: # We're done preparing and finally ready to start the rendering
935: my $result = "<td align='left' valign='center'>";
936:
937: my $indentLevel = $params->{'indentLevel'};
938: if ($newBranchText) { $indentLevel--; }
939:
940: # print indentation
941: for (my $i = 0; $i < $indentLevel; $i++) {
942: $result .= $params->{'indentString'};
943: }
944:
945: # Decide what to display
946: $result .= "$newBranchText$linkopen$icon$linkclose";
947:
948: my $curMarkerBegin = '';
949: my $curMarkerEnd = '';
950:
951: # Is this the current resource?
952: if (!$params->{'displayedHereMarker'} &&
953: $resource->symb() eq $params->{'here'} ) {
954: $curMarkerBegin = '<font color="red" size="+2">> </font>';
955: $curMarkerEnd = '<font color="red" size="+2"><</font>';
956: $params->{'displayedHereMarker'} = 1;
957: }
958:
959: if ($resource->is_problem() && $part ne '0' &&
960: !$params->{'condensed'}) {
961: my $displaypart=&Apache::lonnet::EXT('resource.'.$part.'.display',
962: $resource->symb());
963: unless ($displaypart) { $displaypart=$part; }
964: $partLabel = " (Part: $displaypart)";
965: $link.='#'.&Apache::lonnet::escape($part);
966: $title = "";
967: }
968:
969: if ($params->{'condensed'} && $resource->countParts() > 1) {
970: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
971: }
972:
973: if (!$params->{'resource_nolink'} && !$resource->is_sequence()) {
974: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
975: } else {
976: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
977: }
978:
979: return $result;
980: }
981:
982: sub render_communication_status {
983: my ($resource, $part, $params) = @_;
984: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
985:
986: my $link = $params->{"resourceLink"};
987: my $linkopen = "<a href='$link'>";
988: my $linkclose = "</a>";
989:
990: if ($resource->hasDiscussion()) {
991: $discussionHTML = $linkopen .
992: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
993: $linkclose;
994: }
995:
996: if ($resource->getFeedback()) {
997: my $feedback = $resource->getFeedback();
998: foreach (split(/\,/, $feedback)) {
999: if ($_) {
1000: $feedbackHTML .= ' <a href="/adm/email?display='
1001: . &Apache::lonnet::escape($_) . '">'
1002: . '<img src="/adm/lonMisc/feedback.gif" '
1003: . 'border="0" /></a>';
1004: }
1005: }
1006: }
1007:
1008: if ($resource->getErrors()) {
1009: my $errors = $resource->getErrors();
1010: my $errorcount = 0;
1011: foreach (split(/,/, $errors)) {
1012: last if ($errorcount>=10); # Only output 10 bombs maximum
1013: if ($_) {
1014: $errorcount++;
1015: $errorHTML .= ' <a href="/adm/email?display='
1016: . &Apache::lonnet::escape($_) . '">'
1017: . '<img src="/adm/lonMisc/bomb.gif" '
1018: . 'border="0" /></a>';
1019: }
1020: }
1021: }
1022:
1023: if ($params->{'multipart'} && $part != '0') {
1024: $discussionHTML = $feedbackHTML = $errorHTML = '';
1025: }
1026:
1027: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1028:
1029: }
1030: sub render_quick_status {
1031: my ($resource, $part, $params) = @_;
1032: my $result = "";
1033: my $firstDisplayed = !$params->{'condensed'} &&
1034: $params->{'multipart'} && $part eq "0";
1035:
1036: my $link = $params->{"resourceLink"};
1037: my $linkopen = "<a href='$link'>";
1038: my $linkclose = "</a>";
1039:
1040: if ($resource->is_problem() &&
1041: !$firstDisplayed) {
1042:
1043: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1044: my $alt = $iconAltTags{$icon};
1045: if ($icon) {
1046: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1047: } else {
1048: $result .= "<td width='30'> </td>\n";
1049: }
1050: } else { # not problem, no icon
1051: $result .= "<td width='30'> </td>\n";
1052: }
1053:
1054: return $result;
1055: }
1056: sub render_long_status {
1057: my ($resource, $part, $params) = @_;
1058: my $result = "<td align='right' valign='center'>\n";
1059: my $firstDisplayed = !$params->{'condensed'} &&
1060: $params->{'multipart'} && $part eq "0";
1061:
1062: my $color;
1063: if ($resource->is_problem()) {
1064: $color = $colormap{$resource->status};
1065:
1066: if (dueInLessThan24Hours($resource, $part) ||
1067: lastTry($resource, $part)) {
1068: $color = $hurryUpColor;
1069: }
1070: }
1071:
1072: if ($resource->kind() eq "res" &&
1073: $resource->is_problem() &&
1074: !$firstDisplayed) {
1075: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1076: $result .= getDescription($resource, $part);
1077: if ($color) {$result .= "</b></font>"; }
1078: }
1079: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1080: $result .= '(randomly select ' . $resource->randompick() .')';
1081: }
1082:
1083: # Debugging code
1084: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1085: # ' - Part: ' . $part;
1086:
1087: $result .= "</td>\n";
1088:
1089: return $result;
1090: }
1091:
1092: # Colors obtained by taking the icons, matching the colors, and
1093: # possibly reducing the Value (HSV) of the color, if it's too bright
1094: # for text, generally by one third or so.
1095: my %statusColors =
1096: (
1097: $resObj->CLOSED => '#000000',
1098: $resObj->OPEN => '#998b13',
1099: $resObj->CORRECT => '#26933f',
1100: $resObj->INCORRECT => '#c48207',
1101: $resObj->ATTEMPTED => '#a87510',
1102: $resObj->ERROR => '#000000'
1103: );
1104: my %statusStrings =
1105: (
1106: $resObj->CLOSED => 'Not yet open',
1107: $resObj->OPEN => 'Open',
1108: $resObj->CORRECT => 'Correct',
1109: $resObj->INCORRECT => 'Incorrect',
1110: $resObj->ATTEMPTED => 'Attempted',
1111: $resObj->ERROR => 'Network Error'
1112: );
1113: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1114:
1115: use Data::Dumper;
1116: sub render_parts_summary_status {
1117: my ($resource, $part, $params) = @_;
1118: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1119: if ($params->{showParts}) {
1120: return '<td></td>';
1121: }
1122:
1123: my $td = "<td align='right'>\n";
1124: my $endtd = "</td>\n";
1125: my @probs;
1126:
1127: if ($resource->contains_problem) {
1128: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1129: } else {
1130: @probs=($resource);
1131: }
1132: my $return;
1133: my %overallstatus;
1134: my $totalParts;
1135: foreach my $resource (@probs) {
1136: # If there is a single part, just show the simple status
1137: if ($resource->singlepart()) {
1138: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1139: $overallstatus{$status}++;
1140: $totalParts++;
1141: next;
1142: }
1143: # Now we can be sure the $part doesn't really matter.
1144: my $statusCount = $resource->simpleStatusCount();
1145: my @counts;
1146: foreach my $status (@statuses) {
1147: # decouple display order from the simpleStatusCount order
1148: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1149: if ($statusCount->[$slot]) {
1150: $overallstatus{$status}+=$statusCount->[$slot];
1151: $totalParts+=$statusCount->[$slot];
1152: }
1153: }
1154: }
1155: $return.= $td . $totalParts . ' parts: ';
1156: foreach my $status (@statuses) {
1157: if ($overallstatus{$status}) {
1158: $return.="<font color='" . $statusColors{$status} .
1159: "'>" . $overallstatus{$status} . ' '
1160: . $statusStrings{$status} . "</font>";
1161: }
1162: }
1163: $return.= $endtd;
1164: return $return;
1165: }
1166:
1167: my @preparedColumns = (\&render_resource, \&render_communication_status,
1168: \&render_quick_status, \&render_long_status,
1169: \&render_parts_summary_status);
1170:
1171: sub setDefault {
1172: my ($val, $default) = @_;
1173: if (!defined($val)) { return $default; }
1174: return $val;
1175: }
1176:
1177: sub render {
1178: my $args = shift;
1179: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1180: my $result = '';
1181:
1182: # Configure the renderer.
1183: my $cols = $args->{'cols'};
1184: if (!defined($cols)) {
1185: # no columns, no nav maps.
1186: return '';
1187: }
1188: my $mustCloseNavMap = 0;
1189: my $navmap;
1190: if (defined($args->{'navmap'})) {
1191: $navmap = $args->{'navmap'};
1192: }
1193:
1194: my $r = $args->{'r'};
1195: my $queryString = $args->{'queryString'};
1196: my $jump = $args->{'jump'};
1197: my $here = $args->{'here'};
1198: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1199: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1200: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1201: # before the current resource when using #current
1202:
1203: # If we were passed 'here' information, we are not rendering
1204: # after a folder manipulation, and we were not passed an
1205: # iterator, make sure we open the folders to show the "here"
1206: # marker
1207: my $filterHash = {};
1208: # Figure out what we're not displaying
1209: foreach (split(/\,/, $ENV{"form.filter"})) {
1210: if ($_) {
1211: $filterHash->{$_} = "1";
1212: }
1213: }
1214:
1215: # Filter: Remember filter function and add our own filter: Refuse
1216: # to show hidden resources unless the user can see them.
1217: my $userCanSeeHidden = advancedUser();
1218: my $filterFunc = setDefault($args->{'filterFunc'},
1219: sub {return 1;});
1220: if (!$userCanSeeHidden) {
1221: # Without renaming the filterfunc, the server seems to go into
1222: # an infinite loop
1223: my $oldFilterFunc = $filterFunc;
1224: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1225: &$oldFilterFunc($res);};
1226: }
1227:
1228: my $condition = 0;
1229: if ($ENV{'form.condition'}) {
1230: $condition = 1;
1231: }
1232:
1233: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1234: # Step 1: Check to see if we have a navmap
1235: if (!defined($navmap)) {
1236: $navmap = Apache::lonnavmaps::navmap->new();
1237: $mustCloseNavMap = 1;
1238: }
1239:
1240: # Step two: Locate what kind of here marker is necessary
1241: # Determine where the "here" marker is and where the screen jumps to.
1242:
1243: if ($ENV{'form.postsymb'}) {
1244: $here = $jump = $ENV{'form.postsymb'};
1245: } elsif ($ENV{'form.postdata'}) {
1246: # couldn't find a symb, is there a URL?
1247: my $currenturl = $ENV{'form.postdata'};
1248: #$currenturl=~s/^http\:\/\///;
1249: #$currenturl=~s/^[^\/]+//;
1250:
1251: $here = $jump = &Apache::lonnet::symbread($currenturl);
1252: }
1253:
1254: # Step three: Ensure the folders are open
1255: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1256: my $curRes;
1257: my $found = 0;
1258:
1259: # We only need to do this if we need to open the maps to show the
1260: # current position. This will change the counter so we can't count
1261: # for the jump marker with this loop.
1262: while (($curRes = $mapIterator->next()) && !$found) {
1263: if (ref($curRes) && $curRes->symb() eq $here) {
1264: my $mapStack = $mapIterator->getStack();
1265:
1266: # Ensure the parent maps are open
1267: for my $map (@{$mapStack}) {
1268: if ($condition) {
1269: undef $filterHash->{$map->map_pc()};
1270: } else {
1271: $filterHash->{$map->map_pc()} = 1;
1272: }
1273: }
1274: $found = 1;
1275: }
1276: }
1277: }
1278:
1279: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1280: # If this is a click on a folder or something, we want to preserve the "here"
1281: # from the querystring, and get the new "jump" marker
1282: $here = $ENV{'form.here'};
1283: $jump = $ENV{'form.jump'};
1284: }
1285:
1286: my $it = $args->{'iterator'};
1287: if (!defined($it)) {
1288: # Construct a default iterator based on $ENV{'form.'} information
1289:
1290: # Step 1: Check to see if we have a navmap
1291: if (!defined($navmap)) {
1292: $navmap = Apache::lonnavmaps::navmap->new();
1293: $mustCloseNavMap = 1;
1294: }
1295:
1296: # See if we're being passed a specific map
1297: if ($args->{'iterator_map'}) {
1298: my $map = $args->{'iterator_map'};
1299: $map = $navmap->getResourceByUrl($map);
1300: my $firstResource = $map->map_start();
1301: my $finishResource = $map->map_finish();
1302:
1303: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1304: } else {
1305: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1306: }
1307: }
1308:
1309: # (re-)Locate the jump point, if any
1310: # Note this does not take filtering or hidden into account... need
1311: # to be fixed?
1312: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1313: my $curRes;
1314: my $foundJump = 0;
1315: my $counter = 0;
1316:
1317: while (($curRes = $mapIterator->next()) && !$foundJump) {
1318: if (ref($curRes)) { $counter++; }
1319:
1320: if (ref($curRes) && $jump eq $curRes->symb()) {
1321:
1322: # This is why we have to use the main iterator instead of the
1323: # potentially faster DFS: The count has to be the same, so
1324: # the order has to be the same, which DFS won't give us.
1325: $args->{'currentJumpIndex'} = $counter;
1326: $foundJump = 1;
1327: }
1328: }
1329:
1330: my $showParts = setDefault($args->{'showParts'}, 1);
1331: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1332: # keeps track of when the current resource is found,
1333: # so we can back up a few and put the anchor above the
1334: # current resource
1335: my $printKey = $args->{'printKey'};
1336: my $printCloseAll = $args->{'printCloseAll'};
1337: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1338:
1339: # Print key?
1340: if ($printKey) {
1341: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1342: my $date=localtime;
1343: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1344: if ($navmap->{LAST_CHECK}) {
1345: $result .=
1346: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1347: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1348: '</td><td align="center" valign="bottom"> '.
1349: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1350: '</td>';
1351: } else {
1352: $result .= '<td align="center" valign="bottom"> '.
1353: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1354: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1355: '</td>';
1356: }
1357:
1358: $result .= '</tr></table>';
1359: }
1360:
1361: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1362: if ($condition) {
1363: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1364: "&here=" . Apache::lonnet::escape($here) .
1365: "\">".&mt('Close All Folders')."</a>";
1366: } else {
1367: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1368: "&here=" . Apache::lonnet::escape($here) .
1369: "\">".&mt('Open All Folders')."</a>";
1370: }
1371: $result .= "<br /><br />\n";
1372: }
1373:
1374: if ($r) {
1375: $r->print($result);
1376: $r->rflush();
1377: $result = "";
1378: }
1379: # End parameter setting
1380:
1381: # Data
1382: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1383: my $res = "Apache::lonnavmaps::resource";
1384: my %condenseStatuses =
1385: ( $res->NETWORK_FAILURE => 1,
1386: $res->NOTHING_SET => 1,
1387: $res->CORRECT => 1 );
1388: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1389:
1390: # Shared variables
1391: $args->{'counter'} = 0; # counts the rows
1392: $args->{'indentLevel'} = 0;
1393: $args->{'isNewBranch'} = 0;
1394: $args->{'condensed'} = 0;
1395: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1396: $args->{'displayedHereMarker'} = 0;
1397:
1398: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1399: # since structure actually doesn't matter, except what map has what resources.
1400: if ($args->{'suppressEmptySequences'}) {
1401: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1402: $it->{FIRST_RESOURCE},
1403: $it->{FINISH_RESOURCE},
1404: {}, undef, 1);
1405: my $depth = 0;
1406: $dfsit->next();
1407: my $curRes = $dfsit->next();
1408: while ($depth > -1) {
1409: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1410: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1411:
1412: if (ref($curRes)) {
1413: # Parallel pre-processing: Do sequences have non-filtered-out children?
1414: if ($curRes->is_map()) {
1415: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1416: # Sequences themselves do not count as visible children,
1417: # unless those sequences also have visible children.
1418: # This means if a sequence appears, there's a "promise"
1419: # that there's something under it if you open it, somewhere.
1420: } else {
1421: # Not a sequence: if it's filtered, ignore it, otherwise
1422: # rise up the stack and mark the sequences as having children
1423: if (&$filterFunc($curRes)) {
1424: for my $sequence (@{$dfsit->getStack()}) {
1425: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1426: }
1427: }
1428: }
1429: }
1430: } continue {
1431: $curRes = $dfsit->next();
1432: }
1433: }
1434:
1435: my $displayedJumpMarker = 0;
1436: # Set up iteration.
1437: my $now = time();
1438: my $in24Hours = $now + 24 * 60 * 60;
1439: my $rownum = 0;
1440:
1441: # export "here" marker information
1442: $args->{'here'} = $here;
1443:
1444: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1445: while ($curRes = $it->next($closeAllPages)) {
1446: # Maintain indentation level.
1447: if ($curRes == $it->BEGIN_MAP() ||
1448: $curRes == $it->BEGIN_BRANCH() ) {
1449: $args->{'indentLevel'}++;
1450: }
1451: if ($curRes == $it->END_MAP() ||
1452: $curRes == $it->END_BRANCH() ) {
1453: $args->{'indentLevel'}--;
1454: }
1455: # Notice new branches
1456: if ($curRes == $it->BEGIN_BRANCH()) {
1457: $args->{'isNewBranch'} = 1;
1458: }
1459:
1460: # If this isn't an actual resource, continue on
1461: if (!ref($curRes)) {
1462: next;
1463: }
1464:
1465: # If this has been filtered out, continue on
1466: if (!(&$filterFunc($curRes))) {
1467: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1468: next;
1469: }
1470:
1471: # If this is an empty sequence and we're filtering them, continue on
1472: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1473: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1474: next;
1475: }
1476:
1477: # If we're suppressing navmaps and this is a navmap, continue on
1478: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1479: next;
1480: }
1481:
1482: $args->{'counter'}++;
1483:
1484: # Does it have multiple parts?
1485: $args->{'multipart'} = 0;
1486: $args->{'condensed'} = 0;
1487: my @parts;
1488:
1489: # Decide what parts to show.
1490: if ($curRes->is_problem() && $showParts) {
1491: @parts = @{$curRes->parts()};
1492: $args->{'multipart'} = $curRes->multipart();
1493:
1494: if ($condenseParts) { # do the condensation
1495: if (!$curRes->opendate("0")) {
1496: @parts = ();
1497: $args->{'condensed'} = 1;
1498: }
1499: if (!$args->{'condensed'}) {
1500: # Decide whether to condense based on similarity
1501: my $status = $curRes->status($parts[0]);
1502: my $due = $curRes->duedate($parts[0]);
1503: my $open = $curRes->opendate($parts[0]);
1504: my $statusAllSame = 1;
1505: my $dueAllSame = 1;
1506: my $openAllSame = 1;
1507: for (my $i = 1; $i < scalar(@parts); $i++) {
1508: if ($curRes->status($parts[$i]) != $status){
1509: $statusAllSame = 0;
1510: }
1511: if ($curRes->duedate($parts[$i]) != $due ) {
1512: $dueAllSame = 0;
1513: }
1514: if ($curRes->opendate($parts[$i]) != $open) {
1515: $openAllSame = 0;
1516: }
1517: }
1518: # $*allSame is true if all the statuses were
1519: # the same. Now, if they are all the same and
1520: # match one of the statuses to condense, or they
1521: # are all open with the same due date, or they are
1522: # all OPEN_LATER with the same open date, display the
1523: # status of the first non-zero part (to get the 'correct'
1524: # status right, since 0 is never 'correct' or 'open').
1525: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1526: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1527: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1528: @parts = ($parts[0]);
1529: $args->{'condensed'} = 1;
1530: }
1531: }
1532: # Multipart problem with one part: always "condense" (happens
1533: # to match the desirable behavior)
1534: if ($curRes->countParts() == 1) {
1535: @parts = ($parts[0]);
1536: $args->{'condensed'} = 1;
1537: }
1538: }
1539: }
1540:
1541: # If the multipart problem was condensed, "forget" it was multipart
1542: if (scalar(@parts) == 1) {
1543: $args->{'multipart'} = 0;
1544: } else {
1545: # Add part 0 so we display it correctly.
1546: unshift @parts, '0';
1547: }
1548:
1549: # Now, we've decided what parts to show. Loop through them and
1550: # show them.
1551: foreach my $part (@parts) {
1552: $rownum ++;
1553: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1554:
1555: $result .= " <tr bgcolor='$backgroundColor'>\n";
1556:
1557: # Set up some data about the parts that the cols might want
1558: my $filter = $it->{FILTER};
1559: my $stack = $it->getStack();
1560: my $src = getLinkForResource($stack);
1561: my $anchor='';
1562: if ($src=~s/(\#.*$)//) {
1563: $anchor=$1;
1564: }
1565: my $srcHasQuestion = $src =~ /\?/;
1566: $args->{"resourceLink"} = $src.
1567: ($srcHasQuestion?'&':'?') .
1568: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1569: $anchor;
1570:
1571: # Now, display each column.
1572: foreach my $col (@$cols) {
1573: my $colHTML = '';
1574: if (ref($col)) {
1575: $colHTML .= &$col($curRes, $part, $args);
1576: } else {
1577: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1578: }
1579:
1580: # If this is the first column and it's time to print
1581: # the anchor, do so
1582: if ($col == $cols->[0] &&
1583: $args->{'counter'} == $args->{'currentJumpIndex'} -
1584: $currentJumpDelta) {
1585: # Jam the anchor after the <td> tag;
1586: # necessary for valid HTML (which Mozilla requires)
1587: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1588: $displayedJumpMarker = 1;
1589: }
1590: $result .= $colHTML . "\n";
1591: }
1592: $result .= " </tr>\n";
1593: $args->{'isNewBranch'} = 0;
1594: }
1595:
1596: if ($r && $rownum % 20 == 0) {
1597: $r->print($result);
1598: $result = "";
1599: $r->rflush();
1600: }
1601: } continue {
1602: if ($r) {
1603: # If we have the connection, make sure the user is still connected
1604: my $c = $r->connection;
1605: if ($c->aborted()) {
1606: # Who cares what we do, nobody will see it anyhow.
1607: return '';
1608: }
1609: }
1610: }
1611:
1612: # Print out the part that jumps to #curloc if it exists
1613: # delay needed because the browser is processing the jump before
1614: # it finishes rendering, so it goes to the wrong place!
1615: # onload might be better, but this routine has no access to that.
1616: # On mozilla, the 0-millisecond timeout seems to prevent this;
1617: # it's quite likely this might fix other browsers, too, and
1618: # certainly won't hurt anything.
1619: if ($displayedJumpMarker) {
1620: $result .= "
1621: <script>
1622: if (location.href.indexOf('#curloc')==-1) {
1623: setTimeout(\"location += '#curloc';\", 0)
1624: }
1625: </script>";
1626: }
1627:
1628: $result .= "</table>";
1629:
1630: if ($r) {
1631: $r->print($result);
1632: $result = "";
1633: $r->rflush();
1634: }
1635:
1636: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1637:
1638: return $result;
1639: }
1640:
1641: 1;
1642:
1643: package Apache::lonnavmaps::navmap;
1644:
1645: =pod
1646:
1647: =head1 Object: Apache::lonnavmaps::navmap
1648:
1649: =head2 Overview
1650:
1651: The navmap object's job is to provide access to the resources
1652: in the course as Apache::lonnavmaps::resource objects, and to
1653: query and manage the relationship between those resource objects.
1654:
1655: Generally, you'll use the navmap object in one of three basic ways.
1656: In order of increasing complexity and power:
1657:
1658: =over 4
1659:
1660: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1661: various ways to obtain resource objects, based on various identifiers.
1662: Use this when you want to request information about one object or
1663: a handful of resources you already know the identities of, from some
1664: other source. For more about Ids, Symbs, and MapPcs, see the
1665: Resource documentation. Note that Url should be a B<last resort>,
1666: not your first choice; it only works when there is only one
1667: instance of the resource in the course, which only applies to
1668: maps, and even that may change in the future.
1669:
1670: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1671: retrieves resources matching some criterion and returns them
1672: in a flat array, with no structure information. Use this when
1673: you are manipulating a series of resources, based on what map
1674: the are in, but do not care about branching, or exactly how
1675: the maps and resources are related. This is the most common case.
1676:
1677: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1678: the course's navmap in various ways without writing the traversal
1679: code yourself. See iterator documentation below. Use this when
1680: you need to know absolutely everything about the course, including
1681: branches and the precise relationship between maps and resources.
1682:
1683: =back
1684:
1685: =head2 Creation And Destruction
1686:
1687: To create a navmap object, use the following function:
1688:
1689: =over 4
1690:
1691: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1692:
1693: Creates a new navmap object. Returns the navmap object if this is
1694: successful, or B<undef> if not.
1695:
1696: =back
1697:
1698: When you are done with the $navmap object, you I<must> call
1699: $navmap->untieHashes(), or you'll prevent the current user from using that
1700: course until the web server is restarted. (!)
1701:
1702: =head2 Methods
1703:
1704: =over 4
1705:
1706: =item * B<getIterator>(first, finish, filter, condition):
1707:
1708: See iterator documentation below.
1709:
1710: =cut
1711:
1712: use strict;
1713: use GDBM_File;
1714:
1715: sub new {
1716: # magic invocation to create a class instance
1717: my $proto = shift;
1718: my $class = ref($proto) || $proto;
1719: my $self = {};
1720:
1721: # Resource cache stores navmap resources as we reference them. We generate
1722: # them on-demand so we don't pay for creating resources unless we use them.
1723: $self->{RESOURCE_CACHE} = {};
1724:
1725: # Network failure flag, if we accessed the course or user opt and
1726: # failed
1727: $self->{NETWORK_FAILURE} = 0;
1728:
1729: # tie the nav hash
1730:
1731: my %navmaphash;
1732: my %parmhash;
1733: my $courseFn = $ENV{"request.course.fn"};
1734: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1735: &GDBM_READER(), 0640))) {
1736: return undef;
1737: }
1738:
1739: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1740: &GDBM_READER(), 0640)))
1741: {
1742: untie %{$self->{PARM_HASH}};
1743: return undef;
1744: }
1745:
1746: $self->{NAV_HASH} = \%navmaphash;
1747: $self->{PARM_HASH} = \%parmhash;
1748: $self->{PARM_CACHE} = {};
1749:
1750: bless($self);
1751:
1752: return $self;
1753: }
1754:
1755: sub generate_course_user_opt {
1756: my $self = shift;
1757: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1758:
1759: my $uname=$ENV{'user.name'};
1760: my $udom=$ENV{'user.domain'};
1761: my $uhome=$ENV{'user.home'};
1762: my $cid=$ENV{'request.course.id'};
1763: my $chome=$ENV{'course.'.$cid.'.home'};
1764: my ($cdom,$cnum)=split(/\_/,$cid);
1765:
1766: my $userprefix=$uname.'_'.$udom.'_';
1767:
1768: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1769: unless ($uhome eq 'no_host') {
1770: # ------------------------------------------------- Get coursedata (if present)
1771: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1772: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1773: ':resourcedata',$chome);
1774: # Check for network failure
1775: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1776: $self->{NETWORK_FAILURE} = 1;
1777: } elsif ($reply!~/^error\:/) {
1778: $courserdatas{$cid}=$reply;
1779: $courserdatas{$cid.'.last_cache'}=time;
1780: }
1781: }
1782: foreach (split(/\&/,$courserdatas{$cid})) {
1783: my ($name,$value)=split(/\=/,$_);
1784: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1785: &Apache::lonnet::unescape($value);
1786: }
1787: # --------------------------------------------------- Get userdata (if present)
1788: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1789: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1790: if ($reply!~/^error\:/) {
1791: $userrdatas{$uname.'___'.$udom}=$reply;
1792: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1793: }
1794: # check to see if network failed
1795: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1796: {
1797: $self->{NETWORK_FAILURE} = 1;
1798: }
1799: }
1800: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1801: my ($name,$value)=split(/\=/,$_);
1802: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1803: &Apache::lonnet::unescape($value);
1804: }
1805: $self->{COURSE_OPT} = \%courseopt;
1806: $self->{USER_OPT} = \%useropt;
1807: }
1808:
1809: $self->{COURSE_USER_OPT_GENERATED} = 1;
1810:
1811: return;
1812: }
1813:
1814: sub generate_email_discuss_status {
1815: my $self = shift;
1816: my $symb = shift;
1817: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1818:
1819: my $cid=$ENV{'request.course.id'};
1820: my ($cdom,$cnum)=split(/\_/,$cid);
1821:
1822: my %emailstatus = &Apache::lonnet::dump('email_status');
1823: my $logoutTime = $emailstatus{'logout'};
1824: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1825: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1826: $courseLeaveTime : $logoutTime);
1827: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1828: $cdom, $cnum);
1829: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1830: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
1831: my %lastreadtime = ();
1832: foreach (keys %lastread) {
1833: my $key = $_;
1834: $key =~ s/_lastread$//;
1835: $lastreadtime{$key} = $lastread{$_};
1836: }
1837:
1838: my %feedback=();
1839: my %error=();
1840: my $keys = &Apache::lonnet::reply('keys:'.
1841: $ENV{'user.domain'}.':'.
1842: $ENV{'user.name'}.':nohist_email',
1843: $ENV{'user.home'});
1844:
1845: foreach my $msgid (split(/\&/, $keys)) {
1846: $msgid=&Apache::lonnet::unescape($msgid);
1847: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1848: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1849: my ($what,$url)=($1,$2);
1850: my %status=
1851: &Apache::lonnet::get('email_status',[$msgid]);
1852: if ($status{$msgid}=~/^error\:/) {
1853: $status{$msgid}='';
1854: }
1855:
1856: if (($status{$msgid} eq 'new') ||
1857: (!$status{$msgid})) {
1858: if ($what eq 'Error') {
1859: $error{$url}.=','.$msgid;
1860: } else {
1861: $feedback{$url}.=','.$msgid;
1862: }
1863: }
1864: }
1865: }
1866:
1867: $self->{FEEDBACK} = \%feedback;
1868: $self->{ERROR_MSG} = \%error; # what is this? JB
1869: $self->{DISCUSSION_TIME} = \%discussiontime;
1870: $self->{EMAIL_STATUS} = \%emailstatus;
1871: $self->{LAST_READ} = \%lastreadtime;
1872:
1873: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1874: }
1875:
1876: sub get_user_data {
1877: my $self = shift;
1878: if ($self->{RETRIEVED_USER_DATA}) { return; }
1879:
1880: # Retrieve performance data on problems
1881: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1882: $ENV{'user.domain'},
1883: $ENV{'user.name'});
1884: $self->{STUDENT_DATA} = \%student_data;
1885:
1886: $self->{RETRIEVED_USER_DATA} = 1;
1887: }
1888:
1889: # Internal function: Takes a key to look up in the nav hash and implements internal
1890: # memory caching of that key.
1891: sub navhash {
1892: my $self = shift; my $key = shift;
1893: return $self->{NAV_HASH}->{$key};
1894: }
1895:
1896: =pod
1897:
1898: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1899: false otherwise. Undefined course maps indicate an error somewhere in
1900: LON-CAPA, and you will not be able to proceed with using the navmap.
1901: See the B<NAV> screen for an example of using this.
1902:
1903: =cut
1904:
1905: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1906: sub courseMapDefined {
1907: my $self = shift;
1908: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1909:
1910: my $firstres = $self->navhash("map_start_$uri");
1911: my $lastres = $self->navhash("map_finish_$uri");
1912: return $firstres && $lastres;
1913: }
1914:
1915: sub getIterator {
1916: my $self = shift;
1917: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1918: shift, undef, shift);
1919: return $iterator;
1920: }
1921:
1922: # unties the hash when done
1923: sub untieHashes {
1924: my $self = shift;
1925: untie %{$self->{NAV_HASH}};
1926: untie %{$self->{PARM_HASH}};
1927: }
1928:
1929: # Private method: Does the given resource (as a symb string) have
1930: # current discussion? Returns 0 if chat/mail data not extracted.
1931: sub hasDiscussion {
1932: my $self = shift;
1933: my $symb = shift;
1934:
1935: $self->generate_email_discuss_status();
1936:
1937: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1938:
1939: #return defined($self->{DISCUSSION_TIME}->{$symb});
1940:
1941: # backward compatibility (bulletin boards used to be 'wrapped')
1942: my $ressymb = $symb;
1943: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
1944: unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
1945: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
1946: }
1947: }
1948:
1949: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
1950: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
1951: } else {
1952: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK};
1953: }
1954: }
1955:
1956: # Private method: Does the given resource (as a symb string) have
1957: # current feedback? Returns the string in the feedback hash, which
1958: # will be false if it does not exist.
1959: sub getFeedback {
1960: my $self = shift;
1961: my $symb = shift;
1962:
1963: $self->generate_email_discuss_status();
1964:
1965: if (!defined($self->{FEEDBACK})) { return ""; }
1966:
1967: return $self->{FEEDBACK}->{$symb};
1968: }
1969:
1970: # Private method: Get the errors for that resource (by source).
1971: sub getErrors {
1972: my $self = shift;
1973: my $src = shift;
1974:
1975: $self->generate_email_discuss_status();
1976:
1977: if (!defined($self->{ERROR_MSG})) { return ""; }
1978: return $self->{ERROR_MSG}->{$src};
1979: }
1980:
1981: =pod
1982:
1983: =item * B<getById>(id):
1984:
1985: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1986: object for that resource. This method, or other methods that use it
1987: (as in the resource object) is the only proper way to obtain a
1988: resource object.
1989:
1990: =item * B<getBySymb>(symb):
1991:
1992: Based on the symb of the resource, get a resource object for that
1993: resource. This is one of the proper ways to get a resource object.
1994:
1995: =item * B<getMapByMapPc>(map_pc):
1996:
1997: Based on the map_pc of the resource, get a resource object for
1998: the given map. This is one of the proper ways to get a resource object.
1999:
2000: =cut
2001:
2002: # The strategy here is to cache the resource objects, and only construct them
2003: # as we use them. The real point is to prevent reading any more from the tied
2004: # hash then we have to, which should hopefully alleviate speed problems.
2005:
2006: sub getById {
2007: my $self = shift;
2008: my $id = shift;
2009:
2010: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2011: {
2012: return $self->{RESOURCE_CACHE}->{$id};
2013: }
2014:
2015: # resource handles inserting itself into cache.
2016: # Not clear why the quotes are necessary, but as of this
2017: # writing it doesn't work without them.
2018: return "Apache::lonnavmaps::resource"->new($self, $id);
2019: }
2020:
2021: sub getBySymb {
2022: my $self = shift;
2023: my $symb = shift;
2024: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2025: my $map = $self->getResourceByUrl($mapUrl);
2026: return $self->getById($map->map_pc() . '.' . $id);
2027: }
2028:
2029: sub getByMapPc {
2030: my $self = shift;
2031: my $map_pc = shift;
2032: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2033: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2034: return $self->getById($map_id);
2035: }
2036:
2037: =pod
2038:
2039: =item * B<firstResource>():
2040:
2041: Returns a resource object reference corresponding to the first
2042: resource in the navmap.
2043:
2044: =cut
2045:
2046: sub firstResource {
2047: my $self = shift;
2048: my $firstResource = $self->navhash('map_start_' .
2049: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2050: return $self->getById($firstResource);
2051: }
2052:
2053: =pod
2054:
2055: =item * B<finishResource>():
2056:
2057: Returns a resource object reference corresponding to the last resource
2058: in the navmap.
2059:
2060: =cut
2061:
2062: sub finishResource {
2063: my $self = shift;
2064: my $firstResource = $self->navhash('map_finish_' .
2065: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2066: return $self->getById($firstResource);
2067: }
2068:
2069: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2070: # the actual lookup; parmval caches the results.
2071: sub parmval {
2072: my $self = shift;
2073: my ($what,$symb)=@_;
2074: my $hashkey = $what."|||".$symb;
2075:
2076: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2077: return $self->{PARM_CACHE}->{$hashkey};
2078: }
2079:
2080: my $result = $self->parmval_real($what, $symb);
2081: $self->{PARM_CACHE}->{$hashkey} = $result;
2082: return $result;
2083: }
2084:
2085: sub parmval_real {
2086: my $self = shift;
2087: my ($what,$symb,$recurse) = @_;
2088:
2089: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2090: $self->generate_course_user_opt();
2091:
2092: my $cid=$ENV{'request.course.id'};
2093: my $csec=$ENV{'request.course.sec'};
2094: my $uname=$ENV{'user.name'};
2095: my $udom=$ENV{'user.domain'};
2096:
2097: unless ($symb) { return ''; }
2098: my $result='';
2099:
2100: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2101:
2102: # ----------------------------------------------------- Cascading lookup scheme
2103: my $rwhat=$what;
2104: $what=~s/^parameter\_//;
2105: $what=~s/\_/\./;
2106:
2107: my $symbparm=$symb.'.'.$what;
2108: my $mapparm=$mapname.'___(all).'.$what;
2109: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2110:
2111: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2112: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2113: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2114:
2115: my $courselevel= $usercourseprefix.'.'.$what;
2116: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2117: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2118:
2119: my $useropt = $self->{USER_OPT};
2120: my $courseopt = $self->{COURSE_OPT};
2121: my $parmhash = $self->{PARM_HASH};
2122:
2123: # ---------------------------------------------------------- first, check user
2124: if ($uname and defined($useropt)) {
2125: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2126: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2127: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2128: }
2129:
2130: # ------------------------------------------------------- second, check course
2131: if ($csec and defined($courseopt)) {
2132: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2133: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2134: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2135: }
2136:
2137: if (defined($courseopt)) {
2138: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2139: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2140: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2141: }
2142:
2143: # ----------------------------------------------------- third, check map parms
2144:
2145: my $thisparm=$$parmhash{$symbparm};
2146: if (defined($thisparm)) { return $thisparm; }
2147:
2148: # ----------------------------------------------------- fourth , check default
2149:
2150: my $meta_rwhat=$rwhat;
2151: $meta_rwhat=~s/\./_/g;
2152: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2153: if (defined($default)) { return $default}
2154: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2155: if (defined($default)) { return $default}
2156:
2157: # --------------------------------------------------- fifth , cascade up parts
2158:
2159: my ($space,@qualifier)=split(/\./,$rwhat);
2160: my $qualifier=join('.',@qualifier);
2161: unless ($space eq '0') {
2162: my @parts=split(/_/,$space);
2163: my $id=pop(@parts);
2164: my $part=join('_',@parts);
2165: if ($part eq '') { $part='0'; }
2166: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2167: if (defined($partgeneral)) { return $partgeneral; }
2168: }
2169: if ($recurse) { return undef; }
2170: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2171: if (defined($pack_def)) { return $pack_def; }
2172: return '';
2173: }
2174:
2175: =pod
2176:
2177: =item * B<getResourceByUrl>(url):
2178:
2179: Retrieves a resource object by URL of the resource. If passed a
2180: resource object, it will simply return it, so it is safe to use this
2181: method in code like "$res = $navmap->getResourceByUrl($res)", if
2182: you're not sure if $res is already an object, or just a URL. If the
2183: resource appears multiple times in the course, only the first instance
2184: will be returned. As a result, this is probably useful only for maps.
2185:
2186: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2187:
2188: The map is a specification of a map to retreive the resources from,
2189: either as a url or as an object. The filterFunc is a reference to a
2190: function that takes a resource object as its one argument and returns
2191: true if the resource should be included, or false if it should not
2192: be. If recursive is true, the map will be recursively examined,
2193: otherwise it will not be. If bailout is true, the function will return
2194: as soon as it finds a resource, if false it will finish. By default,
2195: the map is the top-level map of the course, filterFunc is a function
2196: that always returns 1, recursive is true, bailout is false. The
2197: resources will be returned in a list containing the resource objects
2198: for the corresponding resources, with B<no structure information> in
2199: the list; regardless of branching, recursion, etc., it will be a flat
2200: list.
2201:
2202: Thus, this is suitable for cases where you don't want the structure,
2203: just a list of all resources. It is also suitable for finding out how
2204: many resources match a given description; for this use, if all you
2205: want to know is if I<any> resources match the description, the bailout
2206: parameter will allow you to avoid potentially expensive enumeration of
2207: all matching resources.
2208:
2209: =item * B<hasResource>(map, filterFunc, recursive):
2210:
2211: Convience method for
2212:
2213: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2214:
2215: which will tell whether the map has resources matching the description
2216: in the filter function.
2217:
2218: =cut
2219:
2220: sub getResourceByUrl {
2221: my $self = shift;
2222: my $resUrl = shift;
2223:
2224: if (ref($resUrl)) { return $resUrl; }
2225:
2226: $resUrl = &Apache::lonnet::clutter($resUrl);
2227: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2228: if ($resId =~ /,/) {
2229: $resId = (split (/,/, $resId))[0];
2230: }
2231: if (!$resId) { return ''; }
2232: return $self->getById($resId);
2233: }
2234:
2235: sub retrieveResources {
2236: my $self = shift;
2237: my $map = shift;
2238: my $filterFunc = shift;
2239: if (!defined ($filterFunc)) {
2240: $filterFunc = sub {return 1;};
2241: }
2242: my $recursive = shift;
2243: if (!defined($recursive)) { $recursive = 1; }
2244: my $bailout = shift;
2245: if (!defined($bailout)) { $bailout = 0; }
2246:
2247: # Create the necessary iterator.
2248: if (!ref($map)) { # assume it's a url of a map.
2249: $map = $self->getResourceByUrl($map);
2250: }
2251:
2252: # If nothing was passed, assume top-level map
2253: if (!$map) {
2254: $map = $self->getById('0.0');
2255: }
2256:
2257: # Check the map's validity.
2258: if (!$map->is_map()) {
2259: # Oh, to throw an exception.... how I'd love that!
2260: return ();
2261: }
2262:
2263: # Get an iterator.
2264: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2265: undef, $recursive);
2266:
2267: my @resources = ();
2268:
2269: # Run down the iterator and collect the resources.
2270: my $curRes;
2271:
2272: while ($curRes = $it->next()) {
2273: if (ref($curRes)) {
2274: if (!&$filterFunc($curRes)) {
2275: next;
2276: }
2277:
2278: push @resources, $curRes;
2279:
2280: if ($bailout) {
2281: return @resources;
2282: }
2283: }
2284:
2285: }
2286:
2287: return @resources;
2288: }
2289:
2290: sub hasResource {
2291: my $self = shift;
2292: my $map = shift;
2293: my $filterFunc = shift;
2294: my $recursive = shift;
2295:
2296: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2297: }
2298:
2299: 1;
2300:
2301: package Apache::lonnavmaps::iterator;
2302:
2303: =pod
2304:
2305: =back
2306:
2307: =head1 Object: navmap Iterator
2308:
2309: An I<iterator> encapsulates the logic required to traverse a data
2310: structure. navmap uses an iterator to traverse the course map
2311: according to the criteria you wish to use.
2312:
2313: To obtain an iterator, call the B<getIterator>() function of a
2314: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2315: directly.) This will return a reference to the iterator:
2316:
2317: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2318:
2319: To get the next thing from the iterator, call B<next>:
2320:
2321: C<my $nextThing = $resourceIterator-E<gt>next()>
2322:
2323: getIterator behaves as follows:
2324:
2325: =over 4
2326:
2327: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2328:
2329: All parameters are optional. firstResource is a resource reference
2330: corresponding to where the iterator should start. It defaults to
2331: navmap->firstResource() for the corresponding nav map. finishResource
2332: corresponds to where you want the iterator to end, defaulting to
2333: navmap->finishResource(). filterHash is a hash used as a set
2334: containing strings representing the resource IDs, defaulting to
2335: empty. Condition is a 1 or 0 that sets what to do with the filter
2336: hash: If a 0, then only resources that exist IN the filterHash will be
2337: recursed on. If it is a 1, only resources NOT in the filterHash will
2338: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2339: false (default), the iterator will only return the first level of map
2340: that is not just a single, 'redirecting' map. If true, the iterator
2341: will return all information, starting with the top-level map,
2342: regardless of content. returnTopMap, if true (default false), will
2343: cause the iterator to return the top-level map object (resource 0.0)
2344: before anything else.
2345:
2346: Thus, by default, only top-level resources will be shown. Change the
2347: condition to a 1 without changing the hash, and all resources will be
2348: shown. Changing the condition to 1 and including some values in the
2349: hash will allow you to selectively suppress parts of the navmap, while
2350: leaving it on 0 and adding things to the hash will allow you to
2351: selectively add parts of the nav map. See the handler code for
2352: examples.
2353:
2354: The iterator will return either a reference to a resource object, or a
2355: token representing something in the map, such as the beginning of a
2356: new branch. The possible tokens are:
2357:
2358: =over 4
2359:
2360: =item * B<END_ITERATOR>:
2361:
2362: The iterator has returned all that it's going to. Further calls to the
2363: iterator will just produce more of these. This is a "false" value, and
2364: is the only false value the iterator which will be returned, so it can
2365: be used as a loop sentinel.
2366:
2367: =item * B<BEGIN_MAP>:
2368:
2369: A new map is being recursed into. This is returned I<after> the map
2370: resource itself is returned.
2371:
2372: =item * B<END_MAP>:
2373:
2374: The map is now done.
2375:
2376: =item * B<BEGIN_BRANCH>:
2377:
2378: A branch is now starting. The next resource returned will be the first
2379: in that branch.
2380:
2381: =item * B<END_BRANCH>:
2382:
2383: The branch is now done.
2384:
2385: =back
2386:
2387: The tokens are retreivable via methods on the iterator object, i.e.,
2388: $iterator->END_MAP.
2389:
2390: Maps can contain empty resources. The iterator will automatically skip
2391: over such resources, but will still treat the structure
2392: correctly. Thus, a complicated map with several branches, but
2393: consisting entirely of empty resources except for one beginning or
2394: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2395: but only one resource will be returned.
2396:
2397: =back
2398:
2399: =head2 Normal Usage
2400:
2401: Normal usage of the iterator object is to do the following:
2402:
2403: my $it = $navmap->getIterator([your params here]);
2404: my $curRes;
2405: while ($curRes = $it->next()) {
2406: [your logic here]
2407: }
2408:
2409: Note that inside of the loop, it's frequently useful to check if
2410: "$curRes" is a reference or not with the reference function; only
2411: resource objects will be references, and any non-references will
2412: be the tokens described above.
2413:
2414: Also note there is some old code floating around that trys to track
2415: the depth of the iterator to see when it's done; do not copy that
2416: code. It is difficult to get right and harder to understand then
2417: this. They should be migrated to this new style.
2418:
2419: =cut
2420:
2421: # Here are the tokens for the iterator:
2422:
2423: sub END_ITERATOR { return 0; }
2424: sub BEGIN_MAP { return 1; } # begining of a new map
2425: sub END_MAP { return 2; } # end of the map
2426: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2427: sub END_BRANCH { return 4; } # end of a branch
2428: sub FORWARD { return 1; } # go forward
2429: sub BACKWARD { return 2; }
2430:
2431: sub min {
2432: (my $a, my $b) = @_;
2433: if ($a < $b) { return $a; } else { return $b; }
2434: }
2435:
2436: sub new {
2437: # magic invocation to create a class instance
2438: my $proto = shift;
2439: my $class = ref($proto) || $proto;
2440: my $self = {};
2441:
2442: $self->{NAV_MAP} = shift;
2443: return undef unless ($self->{NAV_MAP});
2444:
2445: # Handle the parameters
2446: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2447: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2448:
2449: # If the given resources are just the ID of the resource, get the
2450: # objects
2451: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2452: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2453: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2454: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2455:
2456: $self->{FILTER} = shift;
2457:
2458: # A hash, used as a set, of resource already seen
2459: $self->{ALREADY_SEEN} = shift;
2460: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2461: $self->{CONDITION} = shift;
2462:
2463: # Do we want to automatically follow "redirection" maps?
2464: $self->{FORCE_TOP} = shift;
2465:
2466: # Do we want to return the top-level map object (resource 0.0)?
2467: $self->{RETURN_0} = shift;
2468: # have we done that yet?
2469: $self->{HAVE_RETURNED_0} = 0;
2470:
2471: # Now, we need to pre-process the map, by walking forward and backward
2472: # over the parts of the map we're going to look at.
2473:
2474: # The processing steps are exactly the same, except for a few small
2475: # changes, so I bundle those up in the following list of two elements:
2476: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2477: # first_resource).
2478: # This prevents writing nearly-identical code twice.
2479: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2480: 'FIRST_RESOURCE'],
2481: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2482: 'FINISH_RESOURCE'] );
2483:
2484: my $maxDepth = 0; # tracks max depth
2485:
2486: # If there is only one resource in this map, and it's a map, we
2487: # want to remember that, so the user can ask for the first map
2488: # that isn't just a redirector.
2489: my $resource; my $resourceCount = 0;
2490:
2491: # Documentation on this algorithm can be found in the CVS repository at
2492: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2493: # in that file.
2494: # **1**
2495:
2496: foreach my $pass (@iterations) {
2497: my $direction = $pass->[0];
2498: my $valName = $pass->[1];
2499: my $nextResourceMethod = $pass->[2];
2500: my $firstResourceName = $pass->[3];
2501:
2502: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2503: $self->{FIRST_RESOURCE},
2504: $self->{FINISH_RESOURCE},
2505: {}, undef, 0, $direction);
2506:
2507: # prime the recursion
2508: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2509: $iterator->next();
2510: my $curRes = $iterator->next();
2511: my $depth = 1;
2512: while ($depth > 0) {
2513: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2514: if ($curRes == $iterator->END_MAP()) { $depth--; }
2515:
2516: if (ref($curRes)) {
2517: # If there's only one resource, this will save it
2518: # we have to filter empty resources from consideration here,
2519: # or even "empty", redirecting maps have two (start & finish)
2520: # or three (start, finish, plus redirector)
2521: if($direction == FORWARD && $curRes->src()) {
2522: $resource = $curRes; $resourceCount++;
2523: }
2524: my $resultingVal = $curRes->{DATA}->{$valName};
2525: my $nextResources = $curRes->$nextResourceMethod();
2526: my $nextCount = scalar(@{$nextResources});
2527:
2528: if ($nextCount == 1) { # **3**
2529: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2530: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2531: }
2532:
2533: if ($nextCount > 1) { # **4**
2534: foreach my $res (@{$nextResources}) {
2535: my $current = $res->{DATA}->{$valName} || 999999999;
2536: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2537: }
2538: }
2539: }
2540:
2541: # Assign the final val (**2**)
2542: if (ref($curRes) && $direction == BACKWARD()) {
2543: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2544: $curRes->{DATA}->{BOT_UP_VAL});
2545:
2546: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2547: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2548: }
2549:
2550: $curRes = $iterator->next();
2551: }
2552: }
2553:
2554: # Check: Was this only one resource, a map?
2555: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2556: my $firstResource = $resource->map_start();
2557: my $finishResource = $resource->map_finish();
2558: return
2559: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2560: $finishResource, $self->{FILTER},
2561: $self->{ALREADY_SEEN},
2562: $self->{CONDITION}, 0);
2563:
2564: }
2565:
2566: # Set up some bookkeeping information.
2567: $self->{CURRENT_DEPTH} = 0;
2568: $self->{MAX_DEPTH} = $maxDepth;
2569: $self->{STACK} = [];
2570: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2571: $self->{FINISHED} = 0; # When true, the iterator has finished
2572:
2573: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2574: push @{$self->{STACK}}, [];
2575: }
2576:
2577: # Prime the recursion w/ the first resource **5**
2578: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2579: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2580:
2581: bless ($self);
2582:
2583: return $self;
2584: }
2585:
2586: sub next {
2587: my $self = shift;
2588: my $closeAllPages=shift;
2589: if ($self->{FINISHED}) {
2590: return END_ITERATOR();
2591: }
2592:
2593: # If we want to return the top-level map object, and haven't yet,
2594: # do so.
2595: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2596: $self->{HAVE_RETURNED_0} = 1;
2597: return $self->{NAV_MAP}->getById('0.0');
2598: }
2599:
2600: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2601: # grab the next from the recursive iterator
2602: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2603:
2604: # is it a begin or end map? If so, update the depth
2605: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2606: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2607:
2608: # Are we back at depth 0? If so, stop recursing
2609: if ($self->{RECURSIVE_DEPTH} == 0) {
2610: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2611: }
2612:
2613: return $next;
2614: }
2615:
2616: if (defined($self->{FORCE_NEXT})) {
2617: my $tmp = $self->{FORCE_NEXT};
2618: $self->{FORCE_NEXT} = undef;
2619: return $tmp;
2620: }
2621:
2622: # Have we not yet begun? If not, return BEGIN_MAP and
2623: # remember we've started.
2624: if ( !$self->{STARTED} ) {
2625: $self->{STARTED} = 1;
2626: return $self->BEGIN_MAP();
2627: }
2628:
2629: # Here's the guts of the iterator.
2630:
2631: # Find the next resource, if any.
2632: my $found = 0;
2633: my $i = $self->{MAX_DEPTH};
2634: my $newDepth;
2635: my $here;
2636: while ( $i >= 0 && !$found ) {
2637: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2638: $here = pop @{$self->{STACK}->[$i]}; # **7**
2639: $found = 1;
2640: $newDepth = $i;
2641: }
2642: $i--;
2643: }
2644:
2645: # If we still didn't find anything, we're done.
2646: if ( !$found ) {
2647: # We need to get back down to the correct branch depth
2648: if ( $self->{CURRENT_DEPTH} > 0 ) {
2649: $self->{CURRENT_DEPTH}--;
2650: return END_BRANCH();
2651: } else {
2652: $self->{FINISHED} = 1;
2653: return END_MAP();
2654: }
2655: }
2656:
2657: # If this is not a resource, it must be an END_BRANCH marker we want
2658: # to return directly.
2659: if (!ref($here)) { # **8**
2660: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2661: $self->{CURRENT_DEPTH}--;
2662: return $here;
2663: }
2664: }
2665:
2666: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2667: $self->{HERE} = $here;
2668:
2669: # Get to the right level
2670: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2671: push @{$self->{STACK}->[$newDepth]}, $here;
2672: $self->{CURRENT_DEPTH}--;
2673: return END_BRANCH();
2674: }
2675: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2676: push @{$self->{STACK}->[$newDepth]}, $here;
2677: $self->{CURRENT_DEPTH}++;
2678: return BEGIN_BRANCH();
2679: }
2680:
2681: # If we made it here, we have the next resource, and we're at the
2682: # right branch level. So let's examine the resource for where
2683: # we can get to from here.
2684:
2685: # So we need to look at all the resources we can get to from here,
2686: # categorize them if we haven't seen them, remember if we have a new
2687: my $nextUnfiltered = $here->getNext();
2688: my $maxDepthAdded = -1;
2689:
2690: for (@$nextUnfiltered) {
2691: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2692: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2693: push @{$self->{STACK}->[$depth]}, $_;
2694: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2695: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2696: }
2697: }
2698:
2699: # Is this the end of a branch? If so, all of the resources examined above
2700: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2701: # marker onto the stack so we don't forget.
2702: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2703: # BC branch and gets to C, it will see F as the only next resource, but it's
2704: # one level lower. Thus, this is the end of the branch, since there are no
2705: # more resources added to this level or above.
2706: # We don't do this if the examined resource is the finish resource,
2707: # because the condition given above is true, but the "END_MAP" will
2708: # take care of things and we should already be at depth 0.
2709: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2710: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2711: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2712: }
2713:
2714: # That ends the main iterator logic. Now, do we want to recurse
2715: # down this map (if this resource is a map)?
2716: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
2717: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2718: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2719: my $firstResource = $self->{HERE}->map_start();
2720: my $finishResource = $self->{HERE}->map_finish();
2721:
2722: $self->{RECURSIVE_ITERATOR} =
2723: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2724: $finishResource, $self->{FILTER},
2725: $self->{ALREADY_SEEN}, $self->{CONDITION});
2726: }
2727:
2728: # If this is a blank resource, don't actually return it.
2729: # Should you ever find you need it, make sure to add an option to the code
2730: # that you can use; other things depend on this behavior.
2731: my $browsePriv = $self->{HERE}->browsePriv();
2732: if (!$self->{HERE}->src() ||
2733: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2734: return $self->next($closeAllPages);
2735: }
2736:
2737: return $self->{HERE};
2738:
2739: }
2740:
2741: =pod
2742:
2743: The other method available on the iterator is B<getStack>, which
2744: returns an array populated with the current 'stack' of maps, as
2745: references to the resource objects. Example: This is useful when
2746: making the navigation map, as we need to check whether we are under a
2747: page map to see if we need to link directly to the resource, or to the
2748: page. The first elements in the array will correspond to the top of
2749: the stack (most inclusive map).
2750:
2751: =cut
2752:
2753: sub getStack {
2754: my $self=shift;
2755:
2756: my @stack;
2757:
2758: $self->populateStack(\@stack);
2759:
2760: return \@stack;
2761: }
2762:
2763: # Private method: Calls the iterators recursively to populate the stack.
2764: sub populateStack {
2765: my $self=shift;
2766: my $stack = shift;
2767:
2768: push @$stack, $self->{HERE} if ($self->{HERE});
2769:
2770: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2771: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2772: }
2773: }
2774:
2775: 1;
2776:
2777: package Apache::lonnavmaps::DFSiterator;
2778:
2779: # Not documented in the perldoc: This is a simple iterator that just walks
2780: # through the nav map and presents the resources in a depth-first search
2781: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2782: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2783: # useful for pre-processing of some kind, and is in fact used by the main
2784: # iterator that way, but that's about it.
2785: # One could imagine merging this into the init routine of the main iterator,
2786: # but this might as well be left separate, since it is possible some other
2787: # use might be found for it. - Jeremy
2788:
2789: # Unlike the main iterator, this DOES return all resources, even blank ones.
2790: # The main iterator needs them to correctly preprocess the map.
2791:
2792: sub BEGIN_MAP { return 1; } # begining of a new map
2793: sub END_MAP { return 2; } # end of the map
2794: sub FORWARD { return 1; } # go forward
2795: sub BACKWARD { return 2; }
2796:
2797: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2798: # filter hash ref (or undef), already seen hash or undef, condition
2799: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2800: sub new {
2801: # magic invocation to create a class instance
2802: my $proto = shift;
2803: my $class = ref($proto) || $proto;
2804: my $self = {};
2805:
2806: $self->{NAV_MAP} = shift;
2807: return undef unless ($self->{NAV_MAP});
2808:
2809: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2810: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2811:
2812: # If the given resources are just the ID of the resource, get the
2813: # objects
2814: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2815: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2816: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2817: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2818:
2819: $self->{FILTER} = shift;
2820:
2821: # A hash, used as a set, of resource already seen
2822: $self->{ALREADY_SEEN} = shift;
2823: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2824: $self->{CONDITION} = shift;
2825: $self->{DIRECTION} = shift || FORWARD();
2826:
2827: # Flag: Have we started yet?
2828: $self->{STARTED} = 0;
2829:
2830: # Should we continue calling the recursive iterator, if any?
2831: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2832: # The recursive iterator, if any
2833: $self->{RECURSIVE_ITERATOR} = undef;
2834: # Are we recursing on a map, or a branch?
2835: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2836: # And the count of how deep it is, so that this iterator can keep track of
2837: # when to pick back up again.
2838: $self->{RECURSIVE_DEPTH} = 0;
2839:
2840: # For keeping track of our branches, we maintain our own stack
2841: $self->{STACK} = [];
2842:
2843: # Start with the first resource
2844: if ($self->{DIRECTION} == FORWARD) {
2845: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2846: } else {
2847: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2848: }
2849:
2850: bless($self);
2851: return $self;
2852: }
2853:
2854: sub next {
2855: my $self = shift;
2856:
2857: # Are we using a recursive iterator? If so, pull from that and
2858: # watch the depth; we want to resume our level at the correct time.
2859: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2860: # grab the next from the recursive iterator
2861: my $next = $self->{RECURSIVE_ITERATOR}->next();
2862:
2863: # is it a begin or end map? Update depth if so
2864: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2865: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2866:
2867: # Are we back at depth 0? If so, stop recursing.
2868: if ($self->{RECURSIVE_DEPTH} == 0) {
2869: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2870: }
2871:
2872: return $next;
2873: }
2874:
2875: # Is there a current resource to grab? If not, then return
2876: # END_MAP, which will end the iterator.
2877: if (scalar(@{$self->{STACK}}) == 0) {
2878: return $self->END_MAP();
2879: }
2880:
2881: # Have we not yet begun? If not, return BEGIN_MAP and
2882: # remember that we've started.
2883: if ( !$self->{STARTED} ) {
2884: $self->{STARTED} = 1;
2885: return $self->BEGIN_MAP;
2886: }
2887:
2888: # Get the next resource in the branch
2889: $self->{HERE} = pop @{$self->{STACK}};
2890:
2891: # remember that we've seen this, so we don't return it again later
2892: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2893:
2894: # Get the next possible resources
2895: my $nextUnfiltered;
2896: if ($self->{DIRECTION} == FORWARD()) {
2897: $nextUnfiltered = $self->{HERE}->getNext();
2898: } else {
2899: $nextUnfiltered = $self->{HERE}->getPrevious();
2900: }
2901: my $next = [];
2902:
2903: # filter the next possibilities to remove things we've
2904: # already seen.
2905: foreach (@$nextUnfiltered) {
2906: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2907: push @$next, $_;
2908: }
2909: }
2910:
2911: while (@$next) {
2912: # copy the next possibilities over to the stack
2913: push @{$self->{STACK}}, shift @$next;
2914: }
2915:
2916: # If this is a map and we want to recurse down it... (not filtered out)
2917: if ($self->{HERE}->is_map() &&
2918: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2919: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2920: my $firstResource = $self->{HERE}->map_start();
2921: my $finishResource = $self->{HERE}->map_finish();
2922:
2923: $self->{RECURSIVE_ITERATOR} =
2924: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2925: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2926: $self->{CONDITION}, $self->{DIRECTION});
2927: }
2928:
2929: return $self->{HERE};
2930: }
2931:
2932: # Identical to the full iterator methods of the same name. Hate to copy/paste
2933: # but I also hate to "inherit" either iterator from the other.
2934:
2935: sub getStack {
2936: my $self=shift;
2937:
2938: my @stack;
2939:
2940: $self->populateStack(\@stack);
2941:
2942: return \@stack;
2943: }
2944:
2945: # Private method: Calls the iterators recursively to populate the stack.
2946: sub populateStack {
2947: my $self=shift;
2948: my $stack = shift;
2949:
2950: push @$stack, $self->{HERE} if ($self->{HERE});
2951:
2952: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2953: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2954: }
2955: }
2956:
2957: 1;
2958:
2959: package Apache::lonnavmaps::resource;
2960:
2961: use Apache::lonnet;
2962:
2963: =pod
2964:
2965: =head1 Object: resource
2966:
2967: X<resource, navmap object>
2968: A resource object encapsulates a resource in a resource map, allowing
2969: easy manipulation of the resource, querying the properties of the
2970: resource (including user properties), and represents a reference that
2971: can be used as the canonical representation of the resource by
2972: lonnavmap clients like renderers.
2973:
2974: A resource only makes sense in the context of a navmap, as some of the
2975: data is stored in the navmap object.
2976:
2977: You will probably never need to instantiate this object directly. Use
2978: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2979: starting resource.
2980:
2981: Resource objects respect the parameter_hiddenparts, which suppresses
2982: various parts according to the wishes of the map author. As of this
2983: writing, there is no way to override this parameter, and suppressed
2984: parts will never be returned, nor will their response types or ids be
2985: stored.
2986:
2987: =head2 Overview
2988:
2989: A B<Resource> is the most granular type of object in LON-CAPA that can
2990: be included in a course. It can either be a particular resource, like
2991: an HTML page, external resource, problem, etc., or it can be a
2992: container sequence, such as a "page" or a "map".
2993:
2994: To see a sequence from the user's point of view, please see the
2995: B<Creating a Course: Maps and Sequences> chapter of the Author's
2996: Manual.
2997:
2998: A Resource Object, once obtained from a navmap object via a B<getBy*>
2999: method of the navmap, or from an iterator, allows you to query
3000: information about that resource.
3001:
3002: Generally, you do not ever want to create a resource object yourself,
3003: so creation has been left undocumented. Always retrieve resources
3004: from navmap objects.
3005:
3006: =head3 Identifying Resources
3007:
3008: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3009: unique to that resource for a given course. X<resource ID, in big hash>
3010: The Resource ID has the form #.#, where the first number is the same
3011: for every resource in a map, and the second is unique. For instance,
3012: for a course laid out like this:
3013:
3014: * Problem 1
3015: * Map
3016: * Resource 2
3017: * Resource 3
3018:
3019: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3020: C<Resource 3> will share a first number. The second number may end up
3021: re-used between the two groups.
3022:
3023: The resource ID is only used in the big hash, but can be used in the
3024: context of a course to identify a resource easily. (For instance, the
3025: printing system uses it to record which resources from a sequence you
3026: wish to print.)
3027:
3028: X<symb> X<resource, symb>
3029: All resources also have B<symb>s, which uniquely identify a resource
3030: in a course. Many internal LON-CAPA functions expect a symb. A symb
3031: carries along with it the URL of the resource, and the map it appears
3032: in. Symbs are much larger then resource IDs.
3033:
3034: =cut
3035:
3036: sub new {
3037: # magic invocation to create a class instance
3038: my $proto = shift;
3039: my $class = ref($proto) || $proto;
3040: my $self = {};
3041:
3042: $self->{NAV_MAP} = shift;
3043: $self->{ID} = shift;
3044:
3045: # Store this new resource in the parent nav map's cache.
3046: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3047: $self->{RESOURCE_ERROR} = 0;
3048:
3049: # A hash that can be used by two-pass algorithms to store data
3050: # about this resource in. Not used by the resource object
3051: # directly.
3052: $self->{DATA} = {};
3053:
3054: bless($self);
3055:
3056: return $self;
3057: }
3058:
3059: # private function: simplify the NAV_HASH lookups we keep doing
3060: # pass the name, and to automatically append my ID, pass a true val on the
3061: # second param
3062: sub navHash {
3063: my $self = shift;
3064: my $param = shift;
3065: my $id = shift;
3066: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3067: }
3068:
3069: =pod
3070:
3071: =head2 Methods
3072:
3073: Once you have a resource object, here's what you can do with it:
3074:
3075: =head3 Attribute Retrieval
3076:
3077: Every resource has certain attributes that can be retrieved and used:
3078:
3079: =over 4
3080:
3081: =item * B<ID>: Every resource has an ID that is unique for that
3082: resource in the course it is in. The ID is actually in the hash
3083: representing the resource, so for a resource object $res, obtain
3084: it via C<$res->{ID}).
3085:
3086: =item * B<compTitle>:
3087:
3088: Returns a "composite title", that is equal to $res->title() if the
3089: resource has a title, and is otherwise the last part of the URL (e.g.,
3090: "problem.problem").
3091:
3092: =item * B<ext>:
3093:
3094: Returns true if the resource is external.
3095:
3096: =item * B<kind>:
3097:
3098: Returns the kind of the resource from the compiled nav map.
3099:
3100: =item * B<randomout>:
3101:
3102: Returns true if this resource was chosen to NOT be shown to the user
3103: by the random map selection feature. In other words, this is usually
3104: false.
3105:
3106: =item * B<randompick>:
3107:
3108: Returns true for a map if the randompick feature is being used on the
3109: map. (?)
3110:
3111: =item * B<src>:
3112:
3113: Returns the source for the resource.
3114:
3115: =item * B<symb>:
3116:
3117: Returns the symb for the resource.
3118:
3119: =item * B<title>:
3120:
3121: Returns the title of the resource.
3122:
3123: =back
3124:
3125: =cut
3126:
3127: # These info functions can be used directly, as they don't return
3128: # resource information.
3129: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3130: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3131: sub from { my $self=shift; return $self->navHash("from_", 1); }
3132: # considered private and undocumented
3133: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3134: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3135: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3136: sub randompick {
3137: my $self = shift;
3138: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3139: '.0.parameter_randompick'};
3140: }
3141: sub src {
3142: my $self=shift;
3143: return $self->navHash("src_", 1);
3144: }
3145: sub symb {
3146: my $self=shift;
3147: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3148: my $symbSrc = &Apache::lonnet::declutter($self->src());
3149: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3150: . '___' . $second . '___' . $symbSrc;
3151: return &Apache::lonnet::symbclean($symb);
3152: }
3153: sub title {
3154: my $self=shift;
3155: if ($self->{ID} eq '0.0') {
3156: # If this is the top-level map, return the title of the course
3157: # since this map can not be titled otherwise.
3158: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3159: }
3160: return $self->navHash("title_", 1); }
3161: # considered private and undocumented
3162: sub to { my $self=shift; return $self->navHash("to_", 1); }
3163: sub compTitle {
3164: my $self = shift;
3165: my $title = $self->title();
3166: $title=~s/\&colon\;/\:/gs;
3167: if (!$title) {
3168: $title = $self->src();
3169: $title = substr($title, rindex($title, '/') + 1);
3170: }
3171: return $title;
3172: }
3173: =pod
3174:
3175: B<Predicate Testing the Resource>
3176:
3177: These methods are shortcuts to deciding if a given resource has a given property.
3178:
3179: =over 4
3180:
3181: =item * B<is_map>:
3182:
3183: Returns true if the resource is a map type.
3184:
3185: =item * B<is_problem>:
3186:
3187: Returns true if the resource is a problem type, false
3188: otherwise. (Looks at the extension on the src field; might need more
3189: to work correctly.)
3190:
3191: =item * B<is_page>:
3192:
3193: Returns true if the resource is a page.
3194:
3195: =item * B<is_sequence>:
3196:
3197: Returns true if the resource is a sequence.
3198:
3199: =back
3200:
3201: =cut
3202:
3203: sub hasResource {
3204: my $self = shift;
3205: return $self->{NAV_MAP}->hasResource(@_);
3206: }
3207:
3208: sub retrieveResources {
3209: my $self = shift;
3210: return $self->{NAV_MAP}->retrieveResources(@_);
3211: }
3212:
3213: sub is_html {
3214: my $self=shift;
3215: my $src = $self->src();
3216: return ($src =~ /html$/);
3217: }
3218: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3219: sub is_page {
3220: my $self=shift;
3221: my $src = $self->src();
3222: return $self->navHash("is_map_", 1) &&
3223: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3224: }
3225: sub is_problem {
3226: my $self=shift;
3227: my $src = $self->src();
3228: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3229: }
3230: sub contains_problem {
3231: my $self=shift;
3232: if ($self->is_page()) {
3233: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3234: return $hasProblem;
3235: }
3236: return 0;
3237: }
3238: sub is_sequence {
3239: my $self=shift;
3240: my $src = $self->src();
3241: return $self->navHash("is_map_", 1) &&
3242: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3243: }
3244: sub is_survey {
3245: my $self = shift();
3246: my $part = shift();
3247: if ($self->src() =~ /\.(survey)$/) {
3248: return 1;
3249: }
3250: if ($self->parmval('type',$part) eq 'survey') {
3251: return 1;
3252: }
3253: return 0;
3254: }
3255:
3256: # Private method: Shells out to the parmval in the nav map, handler parts.
3257: sub parmval {
3258: my $self = shift;
3259: my $what = shift;
3260: my $part = shift;
3261: if (!defined($part)) {
3262: $part = '0';
3263: }
3264: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3265: }
3266:
3267: =pod
3268:
3269: B<Map Methods>
3270:
3271: These methods are useful for getting information about the map
3272: properties of the resource, if the resource is a map (B<is_map>).
3273:
3274: =over 4
3275:
3276: =item * B<map_finish>:
3277:
3278: Returns a reference to a resource object corresponding to the finish
3279: resource of the map.
3280:
3281: =item * B<map_pc>:
3282:
3283: Returns the pc value of the map, which is the first number that
3284: appears in the resource ID of the resources in the map, and is the
3285: number that appears around the middle of the symbs of the resources in
3286: that map.
3287:
3288: =item * B<map_start>:
3289:
3290: Returns a reference to a resource object corresponding to the start
3291: resource of the map.
3292:
3293: =item * B<map_type>:
3294:
3295: Returns a string with the type of the map in it.
3296:
3297: =back
3298:
3299: =cut
3300:
3301: sub map_finish {
3302: my $self = shift;
3303: my $src = $self->src();
3304: $src = Apache::lonnet::clutter($src);
3305: my $res = $self->navHash("map_finish_$src", 0);
3306: $res = $self->{NAV_MAP}->getById($res);
3307: return $res;
3308: }
3309: sub map_pc {
3310: my $self = shift;
3311: my $src = $self->src();
3312: return $self->navHash("map_pc_$src", 0);
3313: }
3314: sub map_start {
3315: my $self = shift;
3316: my $src = $self->src();
3317: $src = Apache::lonnet::clutter($src);
3318: my $res = $self->navHash("map_start_$src", 0);
3319: $res = $self->{NAV_MAP}->getById($res);
3320: return $res;
3321: }
3322: sub map_type {
3323: my $self = shift;
3324: my $pc = $self->map_pc();
3325: return $self->navHash("map_type_$pc", 0);
3326: }
3327:
3328: #####
3329: # Property queries
3330: #####
3331:
3332: # These functions will be responsible for returning the CORRECT
3333: # VALUE for the parameter, no matter what. So while they may look
3334: # like direct calls to parmval, they can be more then that.
3335: # So, for instance, the duedate function should use the "duedatetype"
3336: # information, rather then the resource object user.
3337:
3338: =pod
3339:
3340: =head2 Resource Parameters
3341:
3342: In order to use the resource parameters correctly, the nav map must
3343: have been instantiated with genCourseAndUserOptions set to true, so
3344: the courseopt and useropt is read correctly. Then, you can call these
3345: functions to get the relevant parameters for the resource. Each
3346: function defaults to part "0", but can be directed to another part by
3347: passing the part as the parameter.
3348:
3349: These methods are responsible for getting the parameter correct, not
3350: merely reflecting the contents of the GDBM hashes. As we move towards
3351: dates relative to other dates, these methods should be updated to
3352: reflect that. (Then, anybody using these methods will not have to update
3353: their code.)
3354:
3355: =over 4
3356:
3357: =item * B<acc>:
3358:
3359: Get the Client IP/Name Access Control information.
3360:
3361: =item * B<answerdate>:
3362:
3363: Get the answer-reveal date for the problem.
3364:
3365: =item * B<awarded>:
3366:
3367: Gets the awarded value for the problem part. Requires genUserData set to
3368: true when the navmap object was created.
3369:
3370: =item * B<duedate>:
3371:
3372: Get the due date for the problem.
3373:
3374: =item * B<tries>:
3375:
3376: Get the number of tries the student has used on the problem.
3377:
3378: =item * B<maxtries>:
3379:
3380: Get the number of max tries allowed.
3381:
3382: =item * B<opendate>:
3383:
3384: Get the open date for the problem.
3385:
3386: =item * B<sig>:
3387:
3388: Get the significant figures setting.
3389:
3390: =item * B<tol>:
3391:
3392: Get the tolerance for the problem.
3393:
3394: =item * B<tries>:
3395:
3396: Get the number of tries the user has already used on the problem.
3397:
3398: =item * B<type>:
3399:
3400: Get the question type for the problem.
3401:
3402: =item * B<weight>:
3403:
3404: Get the weight for the problem.
3405:
3406: =back
3407:
3408: =cut
3409:
3410: sub acc {
3411: (my $self, my $part) = @_;
3412: return $self->parmval("acc", $part);
3413: }
3414: sub answerdate {
3415: (my $self, my $part) = @_;
3416: # Handle intervals
3417: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3418: return $self->duedate($part) +
3419: $self->parmval("answerdate", $part);
3420: }
3421: return $self->parmval("answerdate", $part);
3422: }
3423: sub awarded {
3424: my $self = shift; my $part = shift;
3425: $self->{NAV_MAP}->get_user_data();
3426: if (!defined($part)) { $part = '0'; }
3427: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3428: }
3429: sub duedate {
3430: (my $self, my $part) = @_;
3431: my $interval=$self->parmval("interval", $part);
3432: if ($interval) {
3433: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3434: if ($first_access) { return ($first_access+$interval); }
3435: }
3436: return $self->parmval("duedate", $part);
3437: }
3438: sub maxtries {
3439: (my $self, my $part) = @_;
3440: return $self->parmval("maxtries", $part);
3441: }
3442: sub opendate {
3443: (my $self, my $part) = @_;
3444: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3445: return $self->duedate($part) -
3446: $self->parmval("opendate", $part);
3447: }
3448: return $self->parmval("opendate");
3449: }
3450: sub problemstatus {
3451: (my $self, my $part) = @_;
3452: return lc $self->parmval("problemstatus", $part);
3453: }
3454: sub sig {
3455: (my $self, my $part) = @_;
3456: return $self->parmval("sig", $part);
3457: }
3458: sub tol {
3459: (my $self, my $part) = @_;
3460: return $self->parmval("tol", $part);
3461: }
3462: sub tries {
3463: my $self = shift;
3464: my $tries = $self->queryRestoreHash('tries', shift);
3465: if (!defined($tries)) { return '0';}
3466: return $tries;
3467: }
3468: sub type {
3469: (my $self, my $part) = @_;
3470: return $self->parmval("type", $part);
3471: }
3472: sub weight {
3473: my $self = shift; my $part = shift;
3474: if (!defined($part)) { $part = '0'; }
3475: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3476: $self->symb(), $ENV{'user.domain'},
3477: $ENV{'user.name'},
3478: $ENV{'request.course.sec'});
3479:
3480: }
3481:
3482: # Multiple things need this
3483: sub getReturnHash {
3484: my $self = shift;
3485:
3486: if (!defined($self->{RETURN_HASH})) {
3487: my %tmpHash = &Apache::lonnet::restore($self->symb());
3488: $self->{RETURN_HASH} = \%tmpHash;
3489: }
3490: }
3491:
3492: ######
3493: # Status queries
3494: ######
3495:
3496: # These methods query the status of problems.
3497:
3498: # If we need to count parts, this function determines the number of
3499: # parts from the metadata. When called, it returns a reference to a list
3500: # of strings corresponding to the parts. (Thus, using it in a scalar context
3501: # tells you how many parts you have in the problem:
3502: # $partcount = scalar($resource->countParts());
3503: # Don't use $self->{PARTS} directly because you don't know if it's been
3504: # computed yet.
3505:
3506: =pod
3507:
3508: =head2 Resource misc
3509:
3510: Misc. functions for the resource.
3511:
3512: =over 4
3513:
3514: =item * B<hasDiscussion>:
3515:
3516: Returns a false value if there has been discussion since the user last
3517: logged in, true if there has. Always returns false if the discussion
3518: data was not extracted when the nav map was constructed.
3519:
3520: =item * B<getFeedback>:
3521:
3522: Gets the feedback for the resource and returns the raw feedback string
3523: for the resource, or the null string if there is no feedback or the
3524: email data was not extracted when the nav map was constructed. Usually
3525: used like this:
3526:
3527: for (split(/\,/, $res->getFeedback())) {
3528: my $link = &Apache::lonnet::escape($_);
3529: ...
3530:
3531: and use the link as appropriate.
3532:
3533: =cut
3534:
3535: sub hasDiscussion {
3536: my $self = shift;
3537: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3538: }
3539:
3540: sub getFeedback {
3541: my $self = shift;
3542: my $source = $self->src();
3543: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3544: return $self->{NAV_MAP}->getFeedback($source);
3545: }
3546:
3547: sub getErrors {
3548: my $self = shift;
3549: my $source = $self->src();
3550: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3551: return $self->{NAV_MAP}->getErrors($source);
3552: }
3553:
3554: =pod
3555:
3556: =item * B<parts>():
3557:
3558: Returns a list reference containing sorted strings corresponding to
3559: each part of the problem. Single part problems have only a part '0'.
3560: Multipart problems do not return their part '0', since they typically
3561: do not really matter.
3562:
3563: =item * B<countParts>():
3564:
3565: Returns the number of parts of the problem a student can answer. Thus,
3566: for single part problems, returns 1. For multipart, it returns the
3567: number of parts in the problem, not including psuedo-part 0.
3568:
3569: =item * B<multipart>():
3570:
3571: Returns true if the problem is multipart, false otherwise. Use this instead
3572: of countParts if all you want is multipart/not multipart.
3573:
3574: =item * B<responseType>($part):
3575:
3576: Returns the response type of the part, without the word "response" on the
3577: end. Example return values: 'string', 'essay', 'numeric', etc.
3578:
3579: =item * B<responseIds>($part):
3580:
3581: Retreives the response IDs for the given part as an array reference containing
3582: strings naming the response IDs. This may be empty.
3583:
3584: =back
3585:
3586: =cut
3587:
3588: sub parts {
3589: my $self = shift;
3590:
3591: if ($self->ext) { return []; }
3592:
3593: $self->extractParts();
3594: return $self->{PARTS};
3595: }
3596:
3597: sub countParts {
3598: my $self = shift;
3599:
3600: my $parts = $self->parts();
3601:
3602: # If I left this here, then it's not necessary.
3603: #my $delta = 0;
3604: #for my $part (@$parts) {
3605: # if ($part eq '0') { $delta--; }
3606: #}
3607:
3608: if ($self->{RESOURCE_ERROR}) {
3609: return 0;
3610: }
3611:
3612: return scalar(@{$parts}); # + $delta;
3613: }
3614:
3615: sub multipart {
3616: my $self = shift;
3617: return $self->countParts() > 1;
3618: }
3619:
3620: sub singlepart {
3621: my $self = shift;
3622: return $self->countParts() == 1;
3623: }
3624:
3625: sub responseType {
3626: my $self = shift;
3627: my $part = shift;
3628:
3629: $self->extractParts();
3630: if (defined($self->{RESPONSE_TYPES}->{$part})) {
3631: return @{$self->{RESPONSE_TYPES}->{$part}};
3632: } else {
3633: return undef;
3634: }
3635: }
3636:
3637: sub responseIds {
3638: my $self = shift;
3639: my $part = shift;
3640:
3641: $self->extractParts();
3642: if (defined($self->{RESPONSE_IDS}->{$part})) {
3643: return @{$self->{RESPONSE_IDS}->{$part}};
3644: } else {
3645: return undef;
3646: }
3647: }
3648:
3649: # Private function: Extracts the parts information, both part names and
3650: # part types, and saves it.
3651: sub extractParts {
3652: my $self = shift;
3653:
3654: return if (defined($self->{PARTS}));
3655: return if ($self->ext);
3656:
3657: $self->{PARTS} = [];
3658:
3659: my %parts;
3660:
3661: # Retrieve part count, if this is a problem
3662: if ($self->is_problem()) {
3663: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
3664: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3665:
3666: if ($partorder) {
3667: my @parts;
3668: for my $part (split (/,/,$partorder)) {
3669: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3670: push @parts, $part;
3671: $parts{$part} = 1;
3672: }
3673: }
3674: $self->{PARTS} = \@parts;
3675: } else {
3676: if (!$metadata) {
3677: $self->{RESOURCE_ERROR} = 1;
3678: $self->{PARTS} = [];
3679: $self->{PART_TYPE} = {};
3680: return;
3681: }
3682: foreach (split(/\,/,$metadata)) {
3683: if ($_ =~ /^part_(.*)$/) {
3684: my $part = $1;
3685: # This floods the logs if it blows up
3686: if (defined($parts{$part})) {
3687: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3688: }
3689:
3690: # check to see if part is turned off.
3691:
3692: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3693: $parts{$part} = 1;
3694: }
3695: }
3696: }
3697: my @sortedParts = sort keys %parts;
3698: $self->{PARTS} = \@sortedParts;
3699: }
3700:
3701:
3702: my %responseIdHash;
3703: my %responseTypeHash;
3704:
3705:
3706: # Init the responseIdHash
3707: foreach (@{$self->{PARTS}}) {
3708: $responseIdHash{$_} = [];
3709: }
3710:
3711: # Now, the unfortunate thing about this is that parts, part name, and
3712: # response id are delimited by underscores, but both the part
3713: # name and response id can themselves have underscores in them.
3714: # So we have to use our knowlege of part names to figure out
3715: # where the part names begin and end, and even then, it is possible
3716: # to construct ambiguous situations.
3717: foreach (split /,/, $metadata) {
3718: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3719: my $responseType = $1;
3720: my $partStuff = $2;
3721: my $partIdSoFar = '';
3722: my @partChunks = split /_/, $partStuff;
3723: my $i = 0;
3724: for ($i = 0; $i < scalar(@partChunks); $i++) {
3725: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3726: $partIdSoFar .= $partChunks[$i];
3727: if ($parts{$partIdSoFar}) {
3728: my @otherChunks = @partChunks[$i+1..$#partChunks];
3729: my $responseId = join('_', @otherChunks);
3730: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3731: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
3732: }
3733: }
3734: }
3735: }
3736: $self->{RESPONSE_IDS} = \%responseIdHash;
3737: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3738: }
3739:
3740: return;
3741: }
3742:
3743: =pod
3744:
3745: =head2 Resource Status
3746:
3747: Problem resources have status information, reflecting their various
3748: dates and completion statuses.
3749:
3750: There are two aspects to the status: the date-related information and
3751: the completion information.
3752:
3753: Idiomatic usage of these two methods would probably look something
3754: like
3755:
3756: foreach ($resource->parts()) {
3757: my $dateStatus = $resource->getDateStatus($_);
3758: my $completionStatus = $resource->getCompletionStatus($_);
3759:
3760: or
3761:
3762: my $status = $resource->status($_);
3763:
3764: ... use it here ...
3765: }
3766:
3767: Which you use depends on exactly what you are looking for. The
3768: status() function has been optimized for the nav maps display and may
3769: not precisely match what you need elsewhere.
3770:
3771: The symbolic constants shown below can be accessed through the
3772: resource object: C<$res->OPEN>.
3773:
3774: =over 4
3775:
3776: =item * B<getDateStatus>($part):
3777:
3778: ($part defaults to 0). A convenience function that returns a symbolic
3779: constant telling you about the date status of the part. The possible
3780: return values are:
3781:
3782: =back
3783:
3784: B<Date Codes>
3785:
3786: =over 4
3787:
3788: =item * B<OPEN_LATER>:
3789:
3790: The problem will be opened later.
3791:
3792: =item * B<OPEN>:
3793:
3794: Open and not yet due.
3795:
3796:
3797: =item * B<PAST_DUE_ANSWER_LATER>:
3798:
3799: The due date has passed, but the answer date has not yet arrived.
3800:
3801: =item * B<PAST_DUE_NO_ANSWER>:
3802:
3803: The due date has passed and there is no answer opening date set.
3804:
3805: =item * B<ANSWER_OPEN>:
3806:
3807: The answer date is here.
3808:
3809: =item * B<NETWORK_FAILURE>:
3810:
3811: The information is unknown due to network failure.
3812:
3813: =back
3814:
3815: =cut
3816:
3817: # Apparently the compiler optimizes these into constants automatically
3818: sub OPEN_LATER { return 0; }
3819: sub OPEN { return 1; }
3820: sub PAST_DUE_NO_ANSWER { return 2; }
3821: sub PAST_DUE_ANSWER_LATER { return 3; }
3822: sub ANSWER_OPEN { return 4; }
3823: sub NOTHING_SET { return 5; }
3824: sub NETWORK_FAILURE { return 100; }
3825:
3826: # getDateStatus gets the date status for a given problem part.
3827: # Because answer date, due date, and open date are fully independent
3828: # (i.e., it is perfectly possible to *only* have an answer date),
3829: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3830: # (past, future, none given). This function handles this with a decision
3831: # tree. Read the comments to follow the decision tree.
3832:
3833: sub getDateStatus {
3834: my $self = shift;
3835: my $part = shift;
3836: $part = "0" if (!defined($part));
3837:
3838: # Always return network failure if there was one.
3839: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3840:
3841: my $now = time();
3842:
3843: my $open = $self->opendate($part);
3844: my $due = $self->duedate($part);
3845: my $answer = $self->answerdate($part);
3846:
3847: if (!$open && !$due && !$answer) {
3848: # no data on the problem at all
3849: # should this be the same as "open later"? think multipart.
3850: return $self->NOTHING_SET;
3851: }
3852: if (!$open || $now < $open) {return $self->OPEN_LATER}
3853: if (!$due || $now < $due) {return $self->OPEN}
3854: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3855: if ($answer) { return $self->ANSWER_OPEN; }
3856: return PAST_DUE_NO_ANSWER;
3857: }
3858:
3859: =pod
3860:
3861: B<>
3862:
3863: =over 4
3864:
3865: =item * B<getCompletionStatus>($part):
3866:
3867: ($part defaults to 0.) A convenience function that returns a symbolic
3868: constant telling you about the completion status of the part, with the
3869: following possible results:
3870:
3871: =back
3872:
3873: B<Completion Codes>
3874:
3875: =over 4
3876:
3877: =item * B<NOT_ATTEMPTED>:
3878:
3879: Has not been attempted at all.
3880:
3881: =item * B<INCORRECT>:
3882:
3883: Attempted, but wrong by student.
3884:
3885: =item * B<INCORRECT_BY_OVERRIDE>:
3886:
3887: Attempted, but wrong by instructor override.
3888:
3889: =item * B<CORRECT>:
3890:
3891: Correct or correct by instructor.
3892:
3893: =item * B<CORRECT_BY_OVERRIDE>:
3894:
3895: Correct by instructor override.
3896:
3897: =item * B<EXCUSED>:
3898:
3899: Excused. Not yet implemented.
3900:
3901: =item * B<NETWORK_FAILURE>:
3902:
3903: Information not available due to network failure.
3904:
3905: =item * B<ATTEMPTED>:
3906:
3907: Attempted, and not yet graded.
3908:
3909: =back
3910:
3911: =cut
3912:
3913: sub NOT_ATTEMPTED { return 10; }
3914: sub INCORRECT { return 11; }
3915: sub INCORRECT_BY_OVERRIDE { return 12; }
3916: sub CORRECT { return 13; }
3917: sub CORRECT_BY_OVERRIDE { return 14; }
3918: sub EXCUSED { return 15; }
3919: sub ATTEMPTED { return 16; }
3920:
3921: sub getCompletionStatus {
3922: my $self = shift;
3923: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3924:
3925: my $status = $self->queryRestoreHash('solved', shift);
3926:
3927: # Left as separate if statements in case we ever do more with this
3928: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3929: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3930: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3931: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3932: if ($status eq 'excused') {return $self->EXCUSED; }
3933: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3934: return $self->NOT_ATTEMPTED;
3935: }
3936:
3937: sub queryRestoreHash {
3938: my $self = shift;
3939: my $hashentry = shift;
3940: my $part = shift;
3941: $part = "0" if (!defined($part) || $part eq '');
3942: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3943:
3944: $self->getReturnHash();
3945:
3946: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3947: }
3948:
3949: =pod
3950:
3951: B<Composite Status>
3952:
3953: Along with directly returning the date or completion status, the
3954: resource object includes a convenience function B<status>() that will
3955: combine the two status tidbits into one composite status that can
3956: represent the status of the resource as a whole. This method represents
3957: the concept of the thing we want to display to the user on the nav maps
3958: screen, which is a combination of completion and open status. The precise logic is
3959: documented in the comments of the status method. The following results
3960: may be returned, all available as methods on the resource object
3961: ($res->NETWORK_FAILURE): In addition to the return values that match
3962: the date or completion status, this function can return "ANSWER_SUBMITTED"
3963: if that problemstatus parameter value is set to No, suppressing the
3964: incorrect/correct feedback.
3965:
3966: =over 4
3967:
3968: =item * B<NETWORK_FAILURE>:
3969:
3970: The network has failed and the information is not available.
3971:
3972: =item * B<NOTHING_SET>:
3973:
3974: No dates have been set for this problem (part) at all. (Because only
3975: certain parts of a multi-part problem may be assigned, this can not be
3976: collapsed into "open later", as we do not know a given part will EVER
3977: be opened. For single part, this is the same as "OPEN_LATER".)
3978:
3979: =item * B<CORRECT>:
3980:
3981: For any reason at all, the part is considered correct.
3982:
3983: =item * B<EXCUSED>:
3984:
3985: For any reason at all, the problem is excused.
3986:
3987: =item * B<PAST_DUE_NO_ANSWER>:
3988:
3989: The problem is past due, not considered correct, and no answer date is
3990: set.
3991:
3992: =item * B<PAST_DUE_ANSWER_LATER>:
3993:
3994: The problem is past due, not considered correct, and an answer date in
3995: the future is set.
3996:
3997: =item * B<ANSWER_OPEN>:
3998:
3999: The problem is past due, not correct, and the answer is now available.
4000:
4001: =item * B<OPEN_LATER>:
4002:
4003: The problem is not yet open.
4004:
4005: =item * B<TRIES_LEFT>:
4006:
4007: The problem is open, has been tried, is not correct, but there are
4008: tries left.
4009:
4010: =item * B<INCORRECT>:
4011:
4012: The problem is open, and all tries have been used without getting the
4013: correct answer.
4014:
4015: =item * B<OPEN>:
4016:
4017: The item is open and not yet tried.
4018:
4019: =item * B<ATTEMPTED>:
4020:
4021: The problem has been attempted.
4022:
4023: =item * B<ANSWER_SUBMITTED>:
4024:
4025: An answer has been submitted, but the student should not see it.
4026:
4027: =back
4028:
4029: =cut
4030:
4031: sub TRIES_LEFT { return 20; }
4032: sub ANSWER_SUBMITTED { return 21; }
4033:
4034: sub status {
4035: my $self = shift;
4036: my $part = shift;
4037: if (!defined($part)) { $part = "0"; }
4038: my $completionStatus = $self->getCompletionStatus($part);
4039: my $dateStatus = $self->getDateStatus($part);
4040:
4041: # What we have is a two-dimensional matrix with 4 entries on one
4042: # dimension and 5 entries on the other, which we want to colorize,
4043: # plus network failure and "no date data at all".
4044:
4045: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4046: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4047:
4048: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4049: # If there's an answer date and we're past it, don't
4050: # suppress the feedback; student should know
4051: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4052: $suppressFeedback = 0;
4053: }
4054:
4055: # There are a few whole rows we can dispose of:
4056: if ($completionStatus == CORRECT ||
4057: $completionStatus == CORRECT_BY_OVERRIDE ) {
4058: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4059: }
4060:
4061: if ($completionStatus == ATTEMPTED) {
4062: return ATTEMPTED;
4063: }
4064:
4065: # If it's EXCUSED, then return that no matter what
4066: if ($completionStatus == EXCUSED) {
4067: return EXCUSED;
4068: }
4069:
4070: if ($dateStatus == NOTHING_SET) {
4071: return NOTHING_SET;
4072: }
4073:
4074: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4075: # by 4 matrix (date statuses).
4076:
4077: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4078: $dateStatus == PAST_DUE_NO_ANSWER ) {
4079: return $dateStatus;
4080: }
4081:
4082: if ($dateStatus == ANSWER_OPEN) {
4083: return ANSWER_OPEN;
4084: }
4085:
4086: # Now: (incorrect, incorrect_override, not_attempted) x
4087: # (open_later), (open)
4088:
4089: if ($dateStatus == OPEN_LATER) {
4090: return OPEN_LATER;
4091: }
4092:
4093: # If it's WRONG...
4094: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4095: # and there are TRIES LEFT:
4096: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4097: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4098: }
4099: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4100: }
4101:
4102: # Otherwise, it's untried and open
4103: return OPEN;
4104: }
4105:
4106: sub CLOSED { return 23; }
4107: sub ERROR { return 24; }
4108:
4109: =pod
4110:
4111: B<Simple Status>
4112:
4113: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4114: "Simple status" corresponds to "which icon is shown on the
4115: Navmaps". There are six "simple" statuses:
4116:
4117: =over 4
4118:
4119: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4120:
4121: =item * B<OPEN>: The problem is open and unattempted.
4122:
4123: =item * B<CORRECT>: The problem is correct for any reason.
4124:
4125: =item * B<INCORRECT>: The problem is incorrect and can still be
4126: completed successfully.
4127:
4128: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4129: does not know if they are correct. (The ellipsis icon.)
4130:
4131: =item * B<ERROR>: There is an error retrieving information about this
4132: problem.
4133:
4134: =back
4135:
4136: =cut
4137:
4138: # This hash maps the composite status to this simple status, and
4139: # can be used directly, if you like
4140: my %compositeToSimple =
4141: (
4142: NETWORK_FAILURE() => ERROR,
4143: NOTHING_SET() => CLOSED,
4144: CORRECT() => CORRECT,
4145: EXCUSED() => CORRECT,
4146: PAST_DUE_NO_ANSWER() => INCORRECT,
4147: PAST_DUE_ANSWER_LATER() => INCORRECT,
4148: ANSWER_OPEN() => INCORRECT,
4149: OPEN_LATER() => CLOSED,
4150: TRIES_LEFT() => OPEN,
4151: INCORRECT() => INCORRECT,
4152: OPEN() => OPEN,
4153: ATTEMPTED() => ATTEMPTED,
4154: ANSWER_SUBMITTED() => ATTEMPTED
4155: );
4156:
4157: sub simpleStatus {
4158: my $self = shift;
4159: my $part = shift;
4160: my $status = $self->status($part);
4161: return $compositeToSimple{$status};
4162: }
4163:
4164: =pod
4165:
4166: B<simpleStatusCount> will return an array reference containing, in
4167: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4168: and ERROR parts the given problem has.
4169:
4170: =cut
4171:
4172: # This maps the status to the slot we want to increment
4173: my %statusToSlotMap =
4174: (
4175: OPEN() => 0,
4176: CLOSED() => 1,
4177: CORRECT() => 2,
4178: INCORRECT() => 3,
4179: ATTEMPTED() => 4,
4180: ERROR() => 5
4181: );
4182:
4183: sub statusToSlot { return $statusToSlotMap{shift()}; }
4184:
4185: sub simpleStatusCount {
4186: my $self = shift;
4187:
4188: my @counts = (0, 0, 0, 0, 0, 0, 0);
4189: foreach my $part (@{$self->parts()}) {
4190: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4191: }
4192:
4193: return \@counts;
4194: }
4195:
4196: =pod
4197:
4198: B<Completable>
4199:
4200: The completable method represents the concept of I<whether the student can
4201: currently do the problem>. If the student can do the problem, which means
4202: that it is open, there are tries left, and if the problem is manually graded
4203: or the grade is suppressed via problemstatus, the student has not tried it
4204: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4205: either the student has tried it and there is no feedback, or that for
4206: some reason it is no longer completable (not open yet, successfully completed,
4207: out of tries, etc.). As an example, this is used as the filter for the
4208: "Uncompleted Homework" option for the nav maps.
4209:
4210: If this does not quite meet your needs, do not fiddle with it (unless you are
4211: fixing it to better match the student's conception of "completable" because
4212: it's broken somehow)... make a new method.
4213:
4214: =cut
4215:
4216: sub completable {
4217: my $self = shift;
4218: if (!$self->is_problem()) { return 0; }
4219: my $partCount = $self->countParts();
4220:
4221: foreach my $part (@{$self->parts()}) {
4222: if ($part eq '0' && $partCount != 1) { next; }
4223: my $status = $self->status($part);
4224: # "If any of the parts are open, or have tries left (implies open),
4225: # and it is not "attempted" (manually graded problem), it is
4226: # not "complete"
4227: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4228: $status == ANSWER_SUBMITTED() ) {
4229: # did this part already, as well as we can
4230: next;
4231: }
4232: if ($status == OPEN() || $status == TRIES_LEFT()) {
4233: return 1;
4234: }
4235: }
4236:
4237: # If all the parts were complete, so was this problem.
4238: return 0;
4239: }
4240:
4241: =pod
4242:
4243: =head2 Resource/Nav Map Navigation
4244:
4245: =over 4
4246:
4247: =item * B<getNext>():
4248:
4249: Retreive an array of the possible next resources after this
4250: one. Always returns an array, even in the one- or zero-element case.
4251:
4252: =item * B<getPrevious>():
4253:
4254: Retreive an array of the possible previous resources from this
4255: one. Always returns an array, even in the one- or zero-element case.
4256:
4257: =cut
4258:
4259: sub getNext {
4260: my $self = shift;
4261: my @branches;
4262: my $to = $self->to();
4263: foreach my $branch ( split(/,/, $to) ) {
4264: my $choice = $self->{NAV_MAP}->getById($branch);
4265: my $next = $choice->goesto();
4266: $next = $self->{NAV_MAP}->getById($next);
4267:
4268: push @branches, $next;
4269: }
4270: return \@branches;
4271: }
4272:
4273: sub getPrevious {
4274: my $self = shift;
4275: my @branches;
4276: my $from = $self->from();
4277: foreach my $branch ( split /,/, $from) {
4278: my $choice = $self->{NAV_MAP}->getById($branch);
4279: my $prev = $choice->comesfrom();
4280: $prev = $self->{NAV_MAP}->getById($prev);
4281:
4282: push @branches, $prev;
4283: }
4284: return \@branches;
4285: }
4286:
4287: sub browsePriv {
4288: my $self = shift;
4289: if (defined($self->{BROWSE_PRIV})) {
4290: return $self->{BROWSE_PRIV};
4291: }
4292:
4293: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4294: }
4295:
4296: =pod
4297:
4298: =back
4299:
4300: =cut
4301:
4302: 1;
4303:
4304: __END__
4305:
4306:
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