1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.230 2003/09/17 21:29:44 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # (Page Handler
29: #
30: # (TeX Content Handler
31: #
32: # 05/29/00,05/30 Gerd Kortemeyer)
33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
35: #
36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
37: # YEAR=2002
38: # 1/1 Gerd Kortemeyer
39: # Oct-Nov Jeremy Bowers
40: # YEAR=2003
41: # Jeremy Bowers ... lots of days
42:
43: package Apache::lonnavmaps;
44:
45: use strict;
46: use Apache::Constants qw(:common :http);
47: use Apache::loncommon();
48: use Apache::lonmenu();
49: use Apache::lonlocal;
50: use POSIX qw (floor strftime);
51: use Data::Dumper; # for debugging, not always used
52:
53: # symbolic constants
54: sub SYMB { return 1; }
55: sub URL { return 2; }
56: sub NOTHING { return 3; }
57:
58: # Some data
59:
60: my $resObj = "Apache::lonnavmaps::resource";
61:
62: # Keep these mappings in sync with lonquickgrades, which uses the colors
63: # instead of the icons.
64: my %statusIconMap =
65: (
66: $resObj->CLOSED => '',
67: $resObj->OPEN => 'navmap.open.gif',
68: $resObj->CORRECT => 'navmap.correct.gif',
69: $resObj->INCORRECT => 'navmap.wrong.gif',
70: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
71: $resObj->ERROR => ''
72: );
73:
74: my %iconAltTags =
75: ( 'navmap.correct.gif' => 'Correct',
76: 'navmap.wrong.gif' => 'Incorrect',
77: 'navmap.open.gif' => 'Open' );
78:
79: # Defines a status->color mapping, null string means don't color
80: my %colormap =
81: ( $resObj->NETWORK_FAILURE => '',
82: $resObj->CORRECT => '',
83: $resObj->EXCUSED => '#3333FF',
84: $resObj->PAST_DUE_ANSWER_LATER => '',
85: $resObj->PAST_DUE_NO_ANSWER => '',
86: $resObj->ANSWER_OPEN => '#006600',
87: $resObj->OPEN_LATER => '',
88: $resObj->TRIES_LEFT => '',
89: $resObj->INCORRECT => '',
90: $resObj->OPEN => '',
91: $resObj->NOTHING_SET => '',
92: $resObj->ATTEMPTED => '',
93: $resObj->ANSWER_SUBMITTED => ''
94: );
95: # And a special case in the nav map; what to do when the assignment
96: # is not yet done and due in less then 24 hours
97: my $hurryUpColor = "#FF0000";
98:
99: sub handler {
100: my $r = shift;
101: real_handler($r);
102: }
103:
104: sub real_handler {
105: my $r = shift;
106:
107: # Handle header-only request
108: if ($r->header_only) {
109: if ($ENV{'browser.mathml'}) {
110: $r->content_type('text/xml');
111: } else {
112: $r->content_type('text/html');
113: }
114: $r->send_http_header;
115: return OK;
116: }
117:
118: # Send header, don't cache this page
119: if ($ENV{'browser.mathml'}) {
120: $r->content_type('text/xml');
121: } else {
122: $r->content_type('text/html');
123: }
124: &Apache::loncommon::no_cache($r);
125: $r->send_http_header;
126:
127: # Create the nav map
128: my $navmap = Apache::lonnavmaps::navmap->new();
129:
130:
131: if (!defined($navmap)) {
132: my $requrl = $r->uri;
133: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
134: return HTTP_NOT_ACCEPTABLE;
135: }
136:
137: $r->print("<html><head>\n");
138: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
139: # ------------------------------------------------------------ Get query string
140: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
141:
142: # ----------------------------------------------------- Force menu registration
143: my $addentries='';
144: if ($ENV{'form.register'}) {
145: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
146: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
147: $r->print(&Apache::lonmenu::registerurl(1));
148: }
149:
150: # Header
151: $r->print('</head>'.
152: &Apache::loncommon::bodytag('Navigate Course Contents','',
153: $addentries,'','',$ENV{'form.register'}));
154: $r->print('<script>window.focus();</script>');
155:
156: $r->rflush();
157:
158: # Check that it's defined
159: if (!($navmap->courseMapDefined())) {
160: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
161: '</body></html>');
162: return OK;
163: }
164:
165: # See if there's only one map in the top-level, if we don't
166: # already have a filter... if so, automatically display it
167: # (older code; should use retrieveResources)
168: if ($ENV{QUERY_STRING} !~ /filter/) {
169: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
170: my $curRes;
171: my $sequenceCount = 0;
172: my $sequenceId;
173: while ($curRes = $iterator->next()) {
174: if (ref($curRes) && $curRes->is_sequence()) {
175: $sequenceCount++;
176: $sequenceId = $curRes->map_pc();
177: }
178: }
179:
180: if ($sequenceCount == 1) {
181: # The automatic iterator creation in the render call
182: # will pick this up. We know the condition because
183: # the defined($ENV{'form.filter'}) also ensures this
184: # is a fresh call.
185: $ENV{'form.filter'} = "$sequenceId";
186: }
187: }
188:
189: my $jumpToFirstHomework = 0;
190: # Check to see if the student is jumping to next open, do-able problem
191: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
192: $jumpToFirstHomework = 1;
193: # Find the next homework problem that they can do.
194: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
195: my $curRes;
196: my $foundDoableProblem = 0;
197: my $problemRes;
198:
199: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
200: if (ref($curRes) && $curRes->is_problem()) {
201: my $status = $curRes->status();
202: if ($curRes->completable()) {
203: $problemRes = $curRes;
204: $foundDoableProblem = 1;
205:
206: # Pop open all previous maps
207: my $stack = $iterator->getStack();
208: pop @$stack; # last resource in the stack is the problem
209: # itself, which we don't need in the map stack
210: my @mapPcs = map {$_->map_pc()} @$stack;
211: $ENV{'form.filter'} = join(',', @mapPcs);
212:
213: # Mark as both "here" and "jump"
214: $ENV{'form.postsymb'} = $curRes->symb();
215: }
216: }
217: }
218:
219: # If we found no problems, print a note to that effect.
220: if (!$foundDoableProblem) {
221: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
222: }
223: } else {
224: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
225: &mt("Go To My First Homework Problem")."</a> ");
226: }
227:
228: my $suppressEmptySequences = 0;
229: my $filterFunc = undef;
230: my $resource_no_folder_link = 0;
231:
232: # Display only due homework.
233: my $showOnlyHomework = 0;
234: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
235: $showOnlyHomework = 1;
236: $suppressEmptySequences = 1;
237: $filterFunc = sub { my $res = shift;
238: return $res->completable() || $res->is_map();
239: };
240: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
241: $ENV{'form.filter'} = '';
242: $ENV{'form.condition'} = 1;
243: $resource_no_folder_link = 1;
244: } else {
245: $r->print("<a href='navmaps?showOnlyHomework'>" .
246: &mt("Show Only Uncompleted Homework")."</a> ");
247: }
248:
249: # renderer call
250: my $renderArgs = { 'cols' => [0,1,2,3],
251: 'url' => '/adm/navmaps',
252: 'navmap' => $navmap,
253: 'suppressNavmap' => 1,
254: 'suppressEmptySequences' => $suppressEmptySequences,
255: 'filterFunc' => $filterFunc,
256: 'resource_no_folder_link' => $resource_no_folder_link,
257: 'r' => $r};
258: my $render = render($renderArgs);
259: $navmap->untieHashes();
260:
261: # If no resources were printed, print a reassuring message so the
262: # user knows there was no error.
263: if ($renderArgs->{'counter'} == 0) {
264: if ($showOnlyHomework) {
265: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
266: } else { # both jumpToFirstHomework and normal use the same: course must be empty
267: $r->print("<p><font size='+1'>This course is empty.</font></p>");
268: }
269: }
270:
271: $r->print("</body></html>");
272: $r->rflush();
273:
274: return OK;
275: }
276:
277: # Convenience functions: Returns a string that adds or subtracts
278: # the second argument from the first hash, appropriate for the
279: # query string that determines which folders to recurse on
280: sub addToFilter {
281: my $hashIn = shift;
282: my $addition = shift;
283: my %hash = %$hashIn;
284: $hash{$addition} = 1;
285:
286: return join (",", keys(%hash));
287: }
288:
289: sub removeFromFilter {
290: my $hashIn = shift;
291: my $subtraction = shift;
292: my %hash = %$hashIn;
293:
294: delete $hash{$subtraction};
295: return join(",", keys(%hash));
296: }
297:
298: # Convenience function: Given a stack returned from getStack on the iterator,
299: # return the correct src() value.
300: # Later, this should add an anchor when we start putting anchors in pages.
301: sub getLinkForResource {
302: my $stack = shift;
303: my $res;
304:
305: # Check to see if there are any pages in the stack
306: foreach $res (@$stack) {
307: if (defined($res) && $res->is_page()) {
308: return $res->src();
309: }
310: }
311:
312: # Failing that, return the src of the last resource that is defined
313: # (when we first recurse on a map, it puts an undefined resource
314: # on the bottom because $self->{HERE} isn't defined yet, and we
315: # want the src for the map anyhow)
316: foreach (@$stack) {
317: if (defined($_)) { $res = $_; }
318: }
319:
320: return $res->src();
321: }
322:
323: # Convenience function: This seperates the logic of how to create
324: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
325: # etc.) into a seperate function. It takes a resource object as the
326: # first parameter, and the part number of the resource as the second.
327: # It's basically a big switch statement on the status of the resource.
328:
329: sub getDescription {
330: my $res = shift;
331: my $part = shift;
332: my $status = $res->status($part);
333:
334: if ($status == $res->NETWORK_FAILURE) {
335: return &mt("Having technical difficulties; please check status later");
336: }
337: if ($status == $res->NOTHING_SET) {
338: return &mt("Not currently assigned.");
339: }
340: if ($status == $res->OPEN_LATER) {
341: return "Open " . timeToHumanString($res->opendate($part));
342: }
343: if ($status == $res->OPEN) {
344: if ($res->duedate($part)) {
345: return &mt("Due")." " .timeToHumanString($res->duedate($part));
346: } else {
347: return &mt("Open, no due date");
348: }
349: }
350: if ($status == $res->PAST_DUE_ANSWER_LATER) {
351: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
352: }
353: if ($status == $res->PAST_DUE_NO_ANSWER) {
354: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
355: }
356: if ($status == $res->ANSWER_OPEN) {
357: return &mt("Answer available");
358: }
359: if ($status == $res->EXCUSED) {
360: return &mt("Excused by instructor");
361: }
362: if ($status == $res->ATTEMPTED) {
363: return &mt("Answer submitted, not yet graded");
364: }
365: if ($status == $res->TRIES_LEFT) {
366: my $tries = $res->tries($part);
367: my $maxtries = $res->maxtries($part);
368: my $triesString = "";
369: if ($tries && $maxtries) {
370: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
371: if ($maxtries > 1 && $maxtries - $tries == 1) {
372: $triesString = "<b>$triesString</b>";
373: }
374: }
375: if ($res->duedate()) {
376: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
377: " $triesString";
378: } else {
379: return &mt("No due date")." $triesString";
380: }
381: }
382: if ($status == $res->ANSWER_SUBMITTED) {
383: return &mt('Answer submitted');
384: }
385: }
386:
387: # Convenience function, so others can use it: Is the problem due in less then
388: # 24 hours, and still can be done?
389:
390: sub dueInLessThen24Hours {
391: my $res = shift;
392: my $part = shift;
393: my $status = $res->status($part);
394:
395: return ($status == $res->OPEN() ||
396: $status == $res->TRIES_LEFT()) &&
397: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
398: $res->duedate() > time();
399: }
400:
401: # Convenience function, so others can use it: Is there only one try remaining for the
402: # part, with more then one try to begin with, not due yet and still can be done?
403: sub lastTry {
404: my $res = shift;
405: my $part = shift;
406:
407: my $tries = $res->tries($part);
408: my $maxtries = $res->maxtries($part);
409: return $tries && $maxtries && $maxtries > 1 &&
410: $maxtries - $tries == 1 && $res->duedate() &&
411: $res->duedate() > time();
412: }
413:
414: # This puts a human-readable name on the ENV variable.
415:
416: sub advancedUser {
417: return $ENV{'request.role.adv'};
418: }
419:
420:
421: # timeToHumanString takes a time number and converts it to a
422: # human-readable representation, meant to be used in the following
423: # manner:
424: # print "Due $timestring"
425: # print "Open $timestring"
426: # print "Answer available $timestring"
427: # Very, very, very, VERY English-only... goodness help a localizer on
428: # this func...
429: sub timeToHumanString {
430: my ($time) = @_;
431: # zero, '0' and blank are bad times
432: if (!$time) {
433: return &mt('never');
434: }
435: unless (&Apache::loncommon::current_language()=~/^en/) {
436: return localtime($time);
437: }
438: my $now = time();
439:
440: my @time = localtime($time);
441: my @now = localtime($now);
442:
443: # Positive = future
444: my $delta = $time - $now;
445:
446: my $minute = 60;
447: my $hour = 60 * $minute;
448: my $day = 24 * $hour;
449: my $week = 7 * $day;
450: my $inPast = 0;
451:
452: # Logic in comments:
453: # Is it now? (extremely unlikely)
454: if ( $delta == 0 ) {
455: return "this instant";
456: }
457:
458: if ($delta < 0) {
459: $inPast = 1;
460: $delta = -$delta;
461: }
462:
463: if ( $delta > 0 ) {
464:
465: my $tense = $inPast ? " ago" : "";
466: my $prefix = $inPast ? "" : "in ";
467:
468: # Less then a minute
469: if ( $delta < $minute ) {
470: if ($delta == 1) { return "${prefix}1 second$tense"; }
471: return "$prefix$delta seconds$tense";
472: }
473:
474: # Less then an hour
475: if ( $delta < $hour ) {
476: # If so, use minutes
477: my $minutes = floor($delta / 60);
478: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
479: return "$prefix$minutes minutes$tense";
480: }
481:
482: # Is it less then 24 hours away? If so,
483: # display hours + minutes
484: if ( $delta < $hour * 24) {
485: my $hours = floor($delta / $hour);
486: my $minutes = floor(($delta % $hour) / $minute);
487: my $hourString = "$hours hours";
488: my $minuteString = ", $minutes minutes";
489: if ($hours == 1) {
490: $hourString = "1 hour";
491: }
492: if ($minutes == 1) {
493: $minuteString = ", 1 minute";
494: }
495: if ($minutes == 0) {
496: $minuteString = "";
497: }
498: return "$prefix$hourString$minuteString$tense";
499: }
500:
501: # Less then 5 days away, display day of the week and
502: # HH:MM
503: if ( $delta < $day * 5 ) {
504: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
505: $timeStr =~ s/12:00 am/midnight/;
506: $timeStr =~ s/12:00 pm/noon/;
507: return ($inPast ? "last " : "next ") .
508: $timeStr;
509: }
510:
511: # Is it this year?
512: if ( $time[5] == $now[5]) {
513: # Return on Month Day, HH:MM meridian
514: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
515: $timeStr =~ s/12:00 am/midnight/;
516: $timeStr =~ s/12:00 pm/noon/;
517: return $timeStr;
518: }
519:
520: # Not this year, so show the year
521: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
522: $timeStr =~ s/12:00 am/midnight/;
523: $timeStr =~ s/12:00 pm/noon/;
524: return $timeStr;
525: }
526: }
527:
528:
529: =pod
530:
531: =head1 NAME
532:
533: Apache::lonnavmap - Subroutines to handle and render the navigation
534: maps
535:
536: =head1 SYNOPSIS
537:
538: The main handler generates the navigational listing for the course,
539: the other objects export this information in a usable fashion for
540: other modules.
541:
542: =head1 OVERVIEW
543:
544: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
545: course structure and caches it in what is often referred to as the
546: "big hash" X<big hash>. You can see it if you are logged into
547: LON-CAPA, in a course, by going to /adm/test. (You may need to
548: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
549: content of the hash will be under the heading "Big Hash".
550:
551: Big Hash contains, among other things, how resources are related
552: to each other (next/previous), what resources are maps, which
553: resources are being chosen to not show to the student (for random
554: selection), and a lot of other things that can take a lot of time
555: to compute due to the amount of data that needs to be collected and
556: processed.
557:
558: Apache::lonnavmaps provides an object model for manipulating this
559: information in a higher-level fashion then directly manipulating
560: the hash. It also provides access to several auxilary functions
561: that aren't necessarily stored in the Big Hash, but are a per-
562: resource sort of value, like whether there is any feedback on
563: a given resource.
564:
565: Apache::lonnavmaps also abstracts away branching, and someday,
566: conditions, for the times where you don't really care about those
567: things.
568:
569: Apache::lonnavmaps also provides fairly powerful routines for
570: rendering navmaps, and last but not least, provides the navmaps
571: view for when the user clicks the NAV button.
572:
573: B<Note>: Apache::lonnavmaps I<only> works for the "currently
574: logged in user"; if you want things like "due dates for another
575: student" lonnavmaps can not directly retrieve information like
576: that. You need the EXT function. This module can still help,
577: because many things, such as the course structure, are constant
578: between users, and Apache::lonnavmaps can help by providing
579: symbs for the EXT call.
580:
581: The rest of this file will cover the provided rendering routines,
582: which can often be used without fiddling with the navmap object at
583: all, then documents the Apache::lonnavmaps::navmap object, which
584: is the key to accessing the Big Hash information, covers the use
585: of the Iterator (which provides the logic for traversing the
586: somewhat-complicated Big Hash data structure), documents the
587: Apache::lonnavmaps::Resource objects that are returned by
588:
589: =head1 Subroutine: render
590:
591: The navmap renderer package provides a sophisticated rendering of the
592: standard navigation maps interface into HTML. The provided nav map
593: handler is actually just a glorified call to this.
594:
595: Because of the large number of parameters this function accepts,
596: instead of passing it arguments as is normal, pass it in an anonymous
597: hash with the desired options.
598:
599: The package provides a function called 'render', called as
600: Apache::lonnavmaps::render({}).
601:
602: =head2 Overview of Columns
603:
604: The renderer will build an HTML table for the navmap and return
605: it. The table is consists of several columns, and a row for each
606: resource (or possibly each part). You tell the renderer how many
607: columns to create and what to place in each column, optionally using
608: one or more of the prepared columns, and the renderer will assemble
609: the table.
610:
611: Any additional generally useful column types should be placed in the
612: renderer code here, so anybody can use it anywhere else. Any code
613: specific to the current application (such as the addition of <input>
614: elements in a column) should be placed in the code of the thing using
615: the renderer.
616:
617: At the core of the renderer is the array reference COLS (see Example
618: section below for how to pass this correctly). The COLS array will
619: consist of entries of one of two types of things: Either an integer
620: representing one of the pre-packaged column types, or a sub reference
621: that takes a resource reference, a part number, and a reference to the
622: argument hash passed to the renderer, and returns a string that will
623: be inserted into the HTML representation as it.
624:
625: All other parameters are ways of either changing how the columns
626: are printing, or which rows are shown.
627:
628: The pre-packaged column names are refered to by constants in the
629: Apache::lonnavmaps namespace. The following currently exist:
630:
631: =over 4
632:
633: =item * B<Apache::lonnavmaps::resource>:
634:
635: The general info about the resource: Link, icon for the type, etc. The
636: first column in the standard nav map display. This column provides the
637: indentation effect seen in the B<NAV> screen. This column also accepts
638: the following parameters in the renderer hash:
639:
640: =over 4
641:
642: =item * B<resource_nolink>: default false
643:
644: If true, the resource will not be linked. By default, all non-folder
645: resources are linked.
646:
647: =item * B<resource_part_count>: default true
648:
649: If true, the resource will show a part count B<if> the full
650: part list is not displayed. (See "condense_parts" later.) If false,
651: the resource will never show a part count.
652:
653: =item * B<resource_no_folder_link>:
654:
655: If true, the resource's folder will not be clickable to open or close
656: it. Default is false. True implies printCloseAll is false, since you
657: can't close or open folders when this is on anyhow.
658:
659: =back
660:
661: =item * B<Apache::lonnavmaps::communication_status>:
662:
663: Whether there is discussion on the resource, email for the user, or
664: (lumped in here) perl errors in the execution of the problem. This is
665: the second column in the main nav map.
666:
667: =item * B<Apache::lonnavmaps::quick_status>:
668:
669: An icon for the status of a problem, with five possible states:
670: Correct, incorrect, open, awaiting grading (for a problem where the
671: computer's grade is suppressed, or the computer can't grade, like
672: essay problem), or none (not open yet, not a problem). The
673: third column of the standard navmap.
674:
675: =item * B<Apache::lonnavmaps::long_status>:
676:
677: A text readout of the details of the current status of the problem,
678: such as "Due in 22 hours". The fourth column of the standard navmap.
679:
680: =item * B<Apache::lonnavmaps::part_status_summary>:
681:
682: A text readout summarizing the status of the problem. If it is a
683: single part problem, will display "Correct", "Incorrect",
684: "Not yet open", "Open", "Attempted", or "Error". If there are
685: multiple parts, this will output a string that in HTML will show a
686: status of how many parts are in each status, in color coding, trying
687: to match the colors of the icons within reason.
688:
689: Note this only makes sense if you are I<not> showing parts. If
690: C<showParts> is true (see below), this column will not output
691: anything.
692:
693: =back
694:
695: If you add any others please be sure to document them here.
696:
697: An example of a column renderer that will show the ID number of a
698: resource, along with the part name if any:
699:
700: sub {
701: my ($resource, $part, $params) = @_;
702: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
703: return '<td>' . $resource->{ID} . '</td>';
704: }
705:
706: Note these functions are responsible for the TD tags, which allow them
707: to override vertical and horizontal alignment, etc.
708:
709: =head2 Parameters
710:
711: Minimally, you should be
712: able to get away with just using 'cols' (to specify the columns
713: shown), 'url' (necessary for the folders to link to the current screen
714: correctly), and possibly 'queryString' if your app calls for it. In
715: that case, maintaining the state of the folders will be done
716: automatically.
717:
718: =over 4
719:
720: =item * B<iterator>: default: constructs one from %ENV
721:
722: A reference to a fresh ::iterator to use from the navmaps. The
723: rendering will reflect the options passed to the iterator, so you can
724: use that to just render a certain part of the course, if you like. If
725: one is not passed, the renderer will attempt to construct one from
726: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
727: 'iterator_map' parameter if any.
728:
729: =item * B<iterator_map>: default: not used
730:
731: If you are letting the renderer do the iterator handling, you can
732: instruct the renderer to render only a particular map by passing it
733: the source of the map you want to process, like
734: '/res/103/jerf/navmap.course.sequence'.
735:
736: =item * B<navmap>: default: constructs one from %ENV
737:
738: A reference to a navmap, used only if an iterator is not passed in. If
739: this is necessary to make an iterator but it is not passed in, a new
740: one will be constructed based on ENV info. This is useful to do basic
741: error checking before passing it off to render.
742:
743: =item * B<r>: default: must be passed in
744:
745: The standard Apache response object. This must be passed to the
746: renderer or the course hash will be locked.
747:
748: =item * B<cols>: default: empty (useless)
749:
750: An array reference
751:
752: =item * B<showParts>:default true
753:
754: A flag. If true, a line for the resource itself, and a line
755: for each part will be displayed. If not, only one line for each
756: resource will be displayed.
757:
758: =item * B<condenseParts>: default true
759:
760: A flag. If true, if all parts of the problem have the same
761: status and that status is Nothing Set, Correct, or Network Failure,
762: then only one line will be displayed for that resource anyhow. If no,
763: all parts will always be displayed. If showParts is 0, this is
764: ignored.
765:
766: =item * B<jumpCount>: default: determined from %ENV
767:
768: A string identifying the URL to place the anchor 'curloc' at.
769: It is the responsibility of the renderer user to
770: ensure that the #curloc is in the URL. By default, determined through
771: the use of the ENV{} 'jump' information, and should normally "just
772: work" correctly.
773:
774: =item * B<here>: default: empty string
775:
776: A Symb identifying where to place the 'here' marker. The empty
777: string means no marker.
778:
779: =item * B<indentString>: default: 25 pixel whitespace image
780:
781: A string identifying the indentation string to use.
782:
783: =item * B<queryString>: default: empty
784:
785: A string which will be prepended to the query string used when the
786: folders are opened or closed. You can use this to pass
787: application-specific values.
788:
789: =item * B<url>: default: none
790:
791: The url the folders will link to, which should be the current
792: page. Required if the resource info column is shown, and you
793: are allowing the user to open and close folders.
794:
795: =item * B<currentJumpIndex>: default: no jumping
796:
797: Describes the currently-open row number to cause the browser to jump
798: to, because the user just opened that folder. By default, pulled from
799: the Jump information in the ENV{'form.*'}.
800:
801: =item * B<printKey>: default: false
802:
803: If true, print the key that appears on the top of the standard
804: navmaps.
805:
806: =item * B<printCloseAll>: default: true
807:
808: If true, print the "Close all folders" or "open all folders"
809: links.
810:
811: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
812:
813: A function that takes the resource object as its only parameter and
814: returns a true or false value. If true, the resource is displayed. If
815: false, it is simply skipped in the display.
816:
817: =item * B<suppressEmptySequences>: default: false
818:
819: If you're using a filter function, and displaying sequences to orient
820: the user, then frequently some sequences will be empty. Setting this to
821: true will cause those sequences not to display, so as not to confuse the
822: user into thinking that if the sequence is there there should be things
823: under it; for example, see the "Show Uncompleted Homework" view on the
824: B<NAV> screen.
825:
826: =item * B<suppressNavmaps>: default: false
827:
828: If true, will not display Navigate Content resources.
829:
830: =back
831:
832: =head2 Additional Info
833:
834: In addition to the parameters you can pass to the renderer, which will
835: be passed through unchange to the column renderers, the renderer will
836: generate the following information which your renderer may find
837: useful:
838:
839: =over 4
840:
841: =item * B<counter>:
842:
843: Contains the number of rows printed. Useful after calling the render
844: function, as you can detect whether anything was printed at all.
845:
846: =item * B<isNewBranch>:
847:
848: Useful for renderers: If this resource is currently the first resource
849: of a new branch, this will be true. The Resource column (leftmost in the
850: navmaps screen) uses this to display the "new branch" icon
851:
852: =back
853:
854: =cut
855:
856: sub resource { return 0; }
857: sub communication_status { return 1; }
858: sub quick_status { return 2; }
859: sub long_status { return 3; }
860: sub part_status_summary { return 4; }
861:
862: sub render_resource {
863: my ($resource, $part, $params) = @_;
864:
865: my $nonLinkedText = ''; # stuff after resource title not in link
866:
867: my $link = $params->{"resourceLink"};
868: my $src = $resource->src();
869: my $it = $params->{"iterator"};
870: my $filter = $it->{FILTER};
871:
872: my $title = $resource->compTitle();
873: if ($src =~ /^\/uploaded\//) {
874: $nonLinkedText=$title;
875: $title = '';
876: }
877: my $partLabel = "";
878: my $newBranchText = "";
879:
880: # If this is a new branch, label it so
881: if ($params->{'isNewBranch'}) {
882: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
883: }
884:
885: # links to open and close the folder
886: my $linkopen = "<a href='$link'>";
887: my $linkclose = "</a>";
888:
889: # Default icon: unknown page
890: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
891:
892: if ($resource->is_problem()) {
893: if ($part eq '0' || $params->{'condensed'}) {
894: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
895: } else {
896: $icon = $params->{'indentString'};
897: }
898: } else {
899: my $curfext= (split (/\./,$resource->src))[-1];
900: my $embstyle = &Apache::loncommon::fileembstyle($curfext);
901: # The unless conditional that follows is a bit of overkill
902: if (!(!defined($embstyle) || $embstyle eq 'unk' || $embstyle eq 'hdn')) {
903: $icon = "<img src='/adm/lonIcons/$curfext.gif' alt='' border='0' />";
904: }
905: }
906:
907: # Display the correct map icon to open or shut map
908: if ($resource->is_map()) {
909: my $mapId = $resource->map_pc();
910: my $nowOpen = !defined($filter->{$mapId});
911: if ($it->{CONDITION}) {
912: $nowOpen = !$nowOpen;
913: }
914:
915: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
916:
917: if (!$params->{'resource_no_folder_link'}) {
918: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
919: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
920:
921: $linkopen = "<a href='" . $params->{'url'} . '?' .
922: $params->{'queryString'} . '&filter=';
923: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
924: addToFilter($filter, $mapId) :
925: removeFromFilter($filter, $mapId);
926: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
927: . $params->{'hereType'} . '&here=' .
928: &Apache::lonnet::escape($params->{'here'}) .
929: '&jump=' .
930: &Apache::lonnet::escape($resource->symb()) .
931: "&folderManip=1'>";
932: } else {
933: # Don't allow users to manipulate folder
934: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
935: '.nomanip.gif';
936: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
937:
938: $linkopen = "";
939: $linkclose = "";
940: }
941: }
942:
943: if ($resource->randomout()) {
944: $nonLinkedText .= ' <i>(hidden)</i> ';
945: }
946:
947: # We're done preparing and finally ready to start the rendering
948: my $result = "<td align='left' valign='center'>";
949:
950: my $indentLevel = $params->{'indentLevel'};
951: if ($newBranchText) { $indentLevel--; }
952:
953: # print indentation
954: for (my $i = 0; $i < $indentLevel; $i++) {
955: $result .= $params->{'indentString'};
956: }
957:
958: # Decide what to display
959: $result .= "$newBranchText$linkopen$icon$linkclose";
960:
961: my $curMarkerBegin = '';
962: my $curMarkerEnd = '';
963:
964: # Is this the current resource?
965: if (!$params->{'displayedHereMarker'} &&
966: $resource->symb() eq $params->{'here'} ) {
967: $curMarkerBegin = '<font color="red" size="+2">> </font>';
968: $curMarkerEnd = '<font color="red" size="+2"><</font>';
969: $params->{'displayedHereMarker'} = 1;
970: }
971:
972: if ($resource->is_problem() && $part ne '0' &&
973: !$params->{'condensed'}) {
974: $partLabel = " (Part $part)";
975: $title = "";
976: }
977:
978: if ($params->{'condensed'} && $resource->countParts() > 1) {
979: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
980: }
981:
982: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\// &&
983: !$resource->is_sequence()) {
984: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
985: } else {
986: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
987: }
988:
989: return $result;
990: }
991:
992: sub render_communication_status {
993: my ($resource, $part, $params) = @_;
994: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
995:
996: my $link = $params->{"resourceLink"};
997: my $linkopen = "<a href='$link'>";
998: my $linkclose = "</a>";
999:
1000: if ($resource->hasDiscussion()) {
1001: $discussionHTML = $linkopen .
1002: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
1003: $linkclose;
1004: }
1005:
1006: if ($resource->getFeedback()) {
1007: my $feedback = $resource->getFeedback();
1008: foreach (split(/\,/, $feedback)) {
1009: if ($_) {
1010: $feedbackHTML .= ' <a href="/adm/email?display='
1011: . &Apache::lonnet::escape($_) . '">'
1012: . '<img src="/adm/lonMisc/feedback.gif" '
1013: . 'border="0" /></a>';
1014: }
1015: }
1016: }
1017:
1018: if ($resource->getErrors()) {
1019: my $errors = $resource->getErrors();
1020: foreach (split(/,/, $errors)) {
1021: if ($_) {
1022: $errorHTML .= ' <a href="/adm/email?display='
1023: . &Apache::lonnet::escape($_) . '">'
1024: . '<img src="/adm/lonMisc/bomb.gif" '
1025: . 'border="0" /></a>';
1026: }
1027: }
1028: }
1029:
1030: if ($params->{'multipart'} && $part != '0') {
1031: $discussionHTML = $feedbackHTML = $errorHTML = '';
1032: }
1033:
1034: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1035:
1036: }
1037: sub render_quick_status {
1038: my ($resource, $part, $params) = @_;
1039: my $result = "";
1040: my $firstDisplayed = !$params->{'condensed'} &&
1041: $params->{'multipart'} && $part eq "0";
1042:
1043: my $link = $params->{"resourceLink"};
1044: my $linkopen = "<a href='$link'>";
1045: my $linkclose = "</a>";
1046:
1047: if ($resource->is_problem() &&
1048: !$firstDisplayed) {
1049:
1050: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1051: my $alt = $iconAltTags{$icon};
1052: if ($icon) {
1053: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1054: } else {
1055: $result .= "<td width='30'> </td>\n";
1056: }
1057: } else { # not problem, no icon
1058: $result .= "<td width='30'> </td>\n";
1059: }
1060:
1061: return $result;
1062: }
1063: sub render_long_status {
1064: my ($resource, $part, $params) = @_;
1065: my $result = "<td align='right' valign='center'>\n";
1066: my $firstDisplayed = !$params->{'condensed'} &&
1067: $params->{'multipart'} && $part eq "0";
1068:
1069: my $color;
1070: if ($resource->is_problem()) {
1071: $color = $colormap{$resource->status};
1072:
1073: if (dueInLessThen24Hours($resource, $part) ||
1074: lastTry($resource, $part)) {
1075: $color = $hurryUpColor;
1076: }
1077: }
1078:
1079: if ($resource->kind() eq "res" &&
1080: $resource->is_problem() &&
1081: !$firstDisplayed) {
1082: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1083: $result .= getDescription($resource, $part);
1084: if ($color) {$result .= "</b></font>"; }
1085: }
1086: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1087: $result .= '(randomly select ' . $resource->randompick() .')';
1088: }
1089:
1090: # Debugging code
1091: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1092: # ' - Part: ' . $part;
1093:
1094: $result .= "</td>\n";
1095:
1096: return $result;
1097: }
1098:
1099: # Colors obtained by taking the icons, matching the colors, and
1100: # possibly reducing the Value (HSV) of the color, if it's too bright
1101: # for text, generally by one third or so.
1102: my %statusColors =
1103: (
1104: $resObj->CLOSED => '#000000',
1105: $resObj->OPEN => '#998b13',
1106: $resObj->CORRECT => '#26933f',
1107: $resObj->INCORRECT => '#c48207',
1108: $resObj->ATTEMPTED => '#a87510',
1109: $resObj->ERROR => '#000000'
1110: );
1111: my %statusStrings =
1112: (
1113: $resObj->CLOSED => 'Not yet open',
1114: $resObj->OPEN => 'Open',
1115: $resObj->CORRECT => 'Correct',
1116: $resObj->INCORRECT => 'Incorrect',
1117: $resObj->ATTEMPTED => 'Attempted',
1118: $resObj->ERROR => 'Network Error'
1119: );
1120: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1121:
1122: use Data::Dumper;
1123: sub render_parts_summary_status {
1124: my ($resource, $part, $params) = @_;
1125: if (!$resource->is_problem()) { return '<td></td>'; }
1126: if ($params->{showParts}) {
1127: return '<td></td>';
1128: }
1129:
1130: my $td = "<td align='right'>\n";
1131: my $endtd = "</td>\n";
1132:
1133: # If there is a single part, just show the simple status
1134: if ($resource->singlepart()) {
1135: my $status = $resource->simpleStatus('0');
1136: return $td . "<font color='" . $statusColors{$status} . "'>"
1137: . $statusStrings{$status} . "</font>" . $endtd;
1138: }
1139:
1140: # Now we can be sure the $part doesn't really matter.
1141: my $statusCount = $resource->simpleStatusCount();
1142: my @counts;
1143: foreach my $status(@statuses) {
1144: # decouple display order from the simpleStatusCount order
1145: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1146: if ($statusCount->[$slot]) {
1147: push @counts, "<font color='" . $statusColors{$status} .
1148: "'>" . $statusCount->[$slot] . ' '
1149: . $statusStrings{$status} . "</font>";
1150: }
1151: }
1152:
1153: return $td . $resource->countParts() . ' parts: ' . join (', ', @counts) . $endtd;
1154: }
1155:
1156: my @preparedColumns = (\&render_resource, \&render_communication_status,
1157: \&render_quick_status, \&render_long_status,
1158: \&render_parts_summary_status);
1159:
1160: sub setDefault {
1161: my ($val, $default) = @_;
1162: if (!defined($val)) { return $default; }
1163: return $val;
1164: }
1165:
1166: sub render {
1167: my $args = shift;
1168: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1169: my $result = '';
1170:
1171: # Configure the renderer.
1172: my $cols = $args->{'cols'};
1173: if (!defined($cols)) {
1174: # no columns, no nav maps.
1175: return '';
1176: }
1177: my $mustCloseNavMap = 0;
1178: my $navmap;
1179: if (defined($args->{'navmap'})) {
1180: $navmap = $args->{'navmap'};
1181: }
1182:
1183: my $r = $args->{'r'};
1184: my $queryString = $args->{'queryString'};
1185: my $jump = $args->{'jump'};
1186: my $here = $args->{'here'};
1187: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1188: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1189: # before the current resource when using #current
1190:
1191: # If we were passed 'here' information, we are not rendering
1192: # after a folder manipulation, and we were not passed an
1193: # iterator, make sure we open the folders to show the "here"
1194: # marker
1195: my $filterHash = {};
1196: # Figure out what we're not displaying
1197: foreach (split(/\,/, $ENV{"form.filter"})) {
1198: if ($_) {
1199: $filterHash->{$_} = "1";
1200: }
1201: }
1202:
1203: # Filter: Remember filter function and add our own filter: Refuse
1204: # to show hidden resources unless the user can see them.
1205: my $userCanSeeHidden = advancedUser();
1206: my $filterFunc = setDefault($args->{'filterFunc'},
1207: sub {return 1;});
1208: if (!$userCanSeeHidden) {
1209: # Without renaming the filterfunc, the server seems to go into
1210: # an infinite loop
1211: my $oldFilterFunc = $filterFunc;
1212: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1213: &$oldFilterFunc($res);};
1214: }
1215:
1216: my $condition = 0;
1217: if ($ENV{'form.condition'}) {
1218: $condition = 1;
1219: }
1220:
1221: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1222: # Step 1: Check to see if we have a navmap
1223: if (!defined($navmap)) {
1224: $navmap = Apache::lonnavmaps::navmap->new();
1225: $mustCloseNavMap = 1;
1226: }
1227:
1228: # Step two: Locate what kind of here marker is necessary
1229: # Determine where the "here" marker is and where the screen jumps to.
1230:
1231: if ($ENV{'form.postsymb'}) {
1232: $here = $jump = $ENV{'form.postsymb'};
1233: } elsif ($ENV{'form.postdata'}) {
1234: # couldn't find a symb, is there a URL?
1235: my $currenturl = $ENV{'form.postdata'};
1236: #$currenturl=~s/^http\:\/\///;
1237: #$currenturl=~s/^[^\/]+//;
1238:
1239: $here = $jump = &Apache::lonnet::symbread($currenturl);
1240: }
1241:
1242: # Step three: Ensure the folders are open
1243: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1244: my $curRes;
1245: my $found = 0;
1246:
1247: # We only need to do this if we need to open the maps to show the
1248: # current position. This will change the counter so we can't count
1249: # for the jump marker with this loop.
1250: while (($curRes = $mapIterator->next()) && !$found) {
1251: if (ref($curRes) && $curRes->symb() eq $here) {
1252: my $mapStack = $mapIterator->getStack();
1253:
1254: # Ensure the parent maps are open
1255: for my $map (@{$mapStack}) {
1256: if ($condition) {
1257: undef $filterHash->{$map->map_pc()};
1258: } else {
1259: $filterHash->{$map->map_pc()} = 1;
1260: }
1261: }
1262: $found = 1;
1263: }
1264: }
1265: }
1266:
1267: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1268: # If this is a click on a folder or something, we want to preserve the "here"
1269: # from the querystring, and get the new "jump" marker
1270: $here = $ENV{'form.here'};
1271: $jump = $ENV{'form.jump'};
1272: }
1273:
1274: my $it = $args->{'iterator'};
1275: if (!defined($it)) {
1276: # Construct a default iterator based on $ENV{'form.'} information
1277:
1278: # Step 1: Check to see if we have a navmap
1279: if (!defined($navmap)) {
1280: $navmap = Apache::lonnavmaps::navmap->new();
1281: $mustCloseNavMap = 1;
1282: }
1283:
1284: # See if we're being passed a specific map
1285: if ($args->{'iterator_map'}) {
1286: my $map = $args->{'iterator_map'};
1287: $map = $navmap->getResourceByUrl($map);
1288: my $firstResource = $map->map_start();
1289: my $finishResource = $map->map_finish();
1290:
1291: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1292: } else {
1293: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1294: }
1295: }
1296:
1297: # (re-)Locate the jump point, if any
1298: # Note this does not take filtering or hidden into account... need
1299: # to be fixed?
1300: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1301: my $curRes;
1302: my $foundJump = 0;
1303: my $counter = 0;
1304:
1305: while (($curRes = $mapIterator->next()) && !$foundJump) {
1306: if (ref($curRes)) { $counter++; }
1307:
1308: if (ref($curRes) && $jump eq $curRes->symb()) {
1309:
1310: # This is why we have to use the main iterator instead of the
1311: # potentially faster DFS: The count has to be the same, so
1312: # the order has to be the same, which DFS won't give us.
1313: $args->{'currentJumpIndex'} = $counter;
1314: $foundJump = 1;
1315: }
1316: }
1317:
1318: my $showParts = setDefault($args->{'showParts'}, 1);
1319: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1320: # keeps track of when the current resource is found,
1321: # so we can back up a few and put the anchor above the
1322: # current resource
1323: my $printKey = $args->{'printKey'};
1324: my $printCloseAll = $args->{'printCloseAll'};
1325: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1326:
1327: # Print key?
1328: if ($printKey) {
1329: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1330: my $date=localtime;
1331: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1332: if ($navmap->{LAST_CHECK}) {
1333: $result .=
1334: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1335: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1336: '</td><td align="center" valign="bottom"> '.
1337: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1338: '</td>';
1339: } else {
1340: $result .= '<td align="center" valign="bottom"> '.
1341: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1342: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1343: '</td>';
1344: }
1345:
1346: $result .= '</tr></table>';
1347: }
1348:
1349: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1350: if ($condition) {
1351: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1352: "&here=" . Apache::lonnet::escape($here) .
1353: "\">".&mt('Close All Folders')."</a>";
1354: } else {
1355: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1356: "&here=" . Apache::lonnet::escape($here) .
1357: "\">".&mt('Open All Folders')."</a>";
1358: }
1359: $result .= "<br /><br />\n";
1360: }
1361:
1362: if ($r) {
1363: $r->print($result);
1364: $r->rflush();
1365: $result = "";
1366: }
1367: # End parameter setting
1368:
1369: # Data
1370: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1371: my $res = "Apache::lonnavmaps::resource";
1372: my %condenseStatuses =
1373: ( $res->NETWORK_FAILURE => 1,
1374: $res->NOTHING_SET => 1,
1375: $res->CORRECT => 1 );
1376: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1377:
1378: # Shared variables
1379: $args->{'counter'} = 0; # counts the rows
1380: $args->{'indentLevel'} = 0;
1381: $args->{'isNewBranch'} = 0;
1382: $args->{'condensed'} = 0;
1383: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1384: $args->{'displayedHereMarker'} = 0;
1385:
1386: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1387: # since structure actually doesn't matter, except what map has what resources.
1388: if ($args->{'suppressEmptySequences'}) {
1389: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1390: $it->{FIRST_RESOURCE},
1391: $it->{FINISH_RESOURCE},
1392: {}, undef, 1);
1393: my $depth = 0;
1394: $dfsit->next();
1395: my $curRes = $dfsit->next();
1396: while ($depth > -1) {
1397: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1398: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1399:
1400: if (ref($curRes)) {
1401: # Parallel pre-processing: Do sequences have non-filtered-out children?
1402: if ($curRes->is_map()) {
1403: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1404: # Sequences themselves do not count as visible children,
1405: # unless those sequences also have visible children.
1406: # This means if a sequence appears, there's a "promise"
1407: # that there's something under it if you open it, somewhere.
1408: } else {
1409: # Not a sequence: if it's filtered, ignore it, otherwise
1410: # rise up the stack and mark the sequences as having children
1411: if (&$filterFunc($curRes)) {
1412: for my $sequence (@{$dfsit->getStack()}) {
1413: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1414: }
1415: }
1416: }
1417: }
1418: } continue {
1419: $curRes = $dfsit->next();
1420: }
1421: }
1422:
1423: my $displayedJumpMarker = 0;
1424: # Set up iteration.
1425: my $now = time();
1426: my $in24Hours = $now + 24 * 60 * 60;
1427: my $rownum = 0;
1428:
1429: # export "here" marker information
1430: $args->{'here'} = $here;
1431:
1432: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1433: while ($curRes = $it->next()) {
1434: # Maintain indentation level.
1435: if ($curRes == $it->BEGIN_MAP() ||
1436: $curRes == $it->BEGIN_BRANCH() ) {
1437: $args->{'indentLevel'}++;
1438: }
1439: if ($curRes == $it->END_MAP() ||
1440: $curRes == $it->END_BRANCH() ) {
1441: $args->{'indentLevel'}--;
1442: }
1443: # Notice new branches
1444: if ($curRes == $it->BEGIN_BRANCH()) {
1445: $args->{'isNewBranch'} = 1;
1446: }
1447:
1448: # If this isn't an actual resource, continue on
1449: if (!ref($curRes)) {
1450: next;
1451: }
1452:
1453: # If this has been filtered out, continue on
1454: if (!(&$filterFunc($curRes))) {
1455: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1456: next;
1457: }
1458:
1459: # If this is an empty sequence and we're filtering them, continue on
1460: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1461: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1462: next;
1463: }
1464:
1465: # If we're suppressing navmaps and this is a navmap, continue on
1466: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1467: next;
1468: }
1469:
1470: $args->{'counter'}++;
1471:
1472: # Does it have multiple parts?
1473: $args->{'multipart'} = 0;
1474: $args->{'condensed'} = 0;
1475: my @parts;
1476:
1477: # Decide what parts to show.
1478: if ($curRes->is_problem() && $showParts) {
1479: @parts = @{$curRes->parts()};
1480: $args->{'multipart'} = $curRes->multipart();
1481:
1482: if ($condenseParts) { # do the condensation
1483: if (!$curRes->opendate("0")) {
1484: @parts = ();
1485: $args->{'condensed'} = 1;
1486: }
1487: if (!$args->{'condensed'}) {
1488: # Decide whether to condense based on similarity
1489: my $status = $curRes->status($parts[0]);
1490: my $due = $curRes->duedate($parts[0]);
1491: my $open = $curRes->opendate($parts[0]);
1492: my $statusAllSame = 1;
1493: my $dueAllSame = 1;
1494: my $openAllSame = 1;
1495: for (my $i = 1; $i < scalar(@parts); $i++) {
1496: if ($curRes->status($parts[$i]) != $status){
1497: $statusAllSame = 0;
1498: }
1499: if ($curRes->duedate($parts[$i]) != $due ) {
1500: $dueAllSame = 0;
1501: }
1502: if ($curRes->opendate($parts[$i]) != $open) {
1503: $openAllSame = 0;
1504: }
1505: }
1506: # $*allSame is true if all the statuses were
1507: # the same. Now, if they are all the same and
1508: # match one of the statuses to condense, or they
1509: # are all open with the same due date, or they are
1510: # all OPEN_LATER with the same open date, display the
1511: # status of the first non-zero part (to get the 'correct'
1512: # status right, since 0 is never 'correct' or 'open').
1513: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1514: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1515: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1516: @parts = ($parts[0]);
1517: $args->{'condensed'} = 1;
1518: }
1519: }
1520: # Multipart problem with one part: always "condense" (happens
1521: # to match the desirable behavior)
1522: if ($curRes->countParts() == 1) {
1523: @parts = ($parts[0]);
1524: $args->{'condensed'} = 1;
1525: }
1526: }
1527: }
1528:
1529: # If the multipart problem was condensed, "forget" it was multipart
1530: if (scalar(@parts) == 1) {
1531: $args->{'multipart'} = 0;
1532: } else {
1533: # Add part 0 so we display it correctly.
1534: unshift @parts, '0';
1535: }
1536:
1537: # Now, we've decided what parts to show. Loop through them and
1538: # show them.
1539: foreach my $part (@parts) {
1540: $rownum ++;
1541: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1542:
1543: $result .= " <tr bgcolor='$backgroundColor'>\n";
1544:
1545: # Set up some data about the parts that the cols might want
1546: my $filter = $it->{FILTER};
1547: my $stack = $it->getStack();
1548: my $src = getLinkForResource($stack);
1549:
1550: my $srcHasQuestion = $src =~ /\?/;
1551: $args->{"resourceLink"} = $src.
1552: ($srcHasQuestion?'&':'?') .
1553: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1554:
1555: # Now, display each column.
1556: foreach my $col (@$cols) {
1557: my $colHTML = '';
1558: if (ref($col)) {
1559: $colHTML .= &$col($curRes, $part, $args);
1560: } else {
1561: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1562: }
1563:
1564: # If this is the first column and it's time to print
1565: # the anchor, do so
1566: if ($col == $cols->[0] &&
1567: $args->{'counter'} == $args->{'currentJumpIndex'} -
1568: $currentJumpDelta) {
1569: # Jam the anchor after the <td> tag;
1570: # necessary for valid HTML (which Mozilla requires)
1571: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1572: $displayedJumpMarker = 1;
1573: }
1574: $result .= $colHTML . "\n";
1575: }
1576: $result .= " </tr>\n";
1577: $args->{'isNewBranch'} = 0;
1578: }
1579:
1580: if ($r && $rownum % 20 == 0) {
1581: $r->print($result);
1582: $result = "";
1583: $r->rflush();
1584: }
1585: } continue {
1586: if ($r) {
1587: # If we have the connection, make sure the user is still connected
1588: my $c = $r->connection;
1589: if ($c->aborted()) {
1590: Apache::lonnet::logthis("navmaps aborted");
1591: # Who cares what we do, nobody will see it anyhow.
1592: return '';
1593: }
1594: }
1595: }
1596:
1597: # Print out the part that jumps to #curloc if it exists
1598: # delay needed because the browser is processing the jump before
1599: # it finishes rendering, so it goes to the wrong place!
1600: # onload might be better, but this routine has no access to that.
1601: # On mozilla, the 0-millisecond timeout seems to prevent this;
1602: # it's quite likely this might fix other browsers, too, and
1603: # certainly won't hurt anything.
1604: if ($displayedJumpMarker) {
1605: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1606: }
1607:
1608: $result .= "</table>";
1609:
1610: if ($r) {
1611: $r->print($result);
1612: $result = "";
1613: $r->rflush();
1614: }
1615:
1616: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1617:
1618: return $result;
1619: }
1620:
1621: 1;
1622:
1623: package Apache::lonnavmaps::navmap;
1624:
1625: =pod
1626:
1627: =head1 Object: Apache::lonnavmaps::navmap
1628:
1629: =head2 Overview
1630:
1631: The navmap object's job is to provide access to the resources
1632: in the course as Apache::lonnavmaps::resource objects, and to
1633: query and manage the relationship between those resource objects.
1634:
1635: Generally, you'll use the navmap object in one of three basic ways.
1636: In order of increasing complexity and power:
1637:
1638: =over 4
1639:
1640: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1641: various ways to obtain resource objects, based on various identifiers.
1642: Use this when you want to request information about one object or
1643: a handful of resources you already know the identities of, from some
1644: other source. For more about Ids, Symbs, and MapPcs, see the
1645: Resource documentation. Note that Url should be a B<last resort>,
1646: not your first choice; it only works when there is only one
1647: instance of the resource in the course, which only applies to
1648: maps, and even that may change in the future.
1649:
1650: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1651: retrieves resources matching some criterion and returns them
1652: in a flat array, with no structure information. Use this when
1653: you are manipulating a series of resources, based on what map
1654: the are in, but do not care about branching, or exactly how
1655: the maps and resources are related. This is the most common case.
1656:
1657: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1658: the course's navmap in various ways without writing the traversal
1659: code yourself. See iterator documentation below. Use this when
1660: you need to know absolutely everything about the course, including
1661: branches and the precise relationship between maps and resources.
1662:
1663: =back
1664:
1665: =head2 Creation And Destruction
1666:
1667: To create a navmap object, use the following function:
1668:
1669: =over 4
1670:
1671: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1672:
1673: Creates a new navmap object. Returns the navmap object if this is
1674: successful, or B<undef> if not.
1675:
1676: =back
1677:
1678: When you are done with the $navmap object, you I<must> call
1679: $navmap->untieHashes(), or you'll prevent the current user from using that
1680: course until the web server is restarted. (!)
1681:
1682: =head2 Methods
1683:
1684: =over 4
1685:
1686: =item * B<getIterator>(first, finish, filter, condition):
1687:
1688: See iterator documentation below.
1689:
1690: =cut
1691:
1692: use strict;
1693: use GDBM_File;
1694:
1695: sub new {
1696: # magic invocation to create a class instance
1697: my $proto = shift;
1698: my $class = ref($proto) || $proto;
1699: my $self = {};
1700:
1701: # Resource cache stores navmap resources as we reference them. We generate
1702: # them on-demand so we don't pay for creating resources unless we use them.
1703: $self->{RESOURCE_CACHE} = {};
1704:
1705: # Network failure flag, if we accessed the course or user opt and
1706: # failed
1707: $self->{NETWORK_FAILURE} = 0;
1708:
1709: # tie the nav hash
1710:
1711: my %navmaphash;
1712: my %parmhash;
1713: my $courseFn = $ENV{"request.course.fn"};
1714: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1715: &GDBM_READER(), 0640))) {
1716: return undef;
1717: }
1718:
1719: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1720: &GDBM_READER(), 0640)))
1721: {
1722: untie %{$self->{PARM_HASH}};
1723: return undef;
1724: }
1725:
1726: $self->{NAV_HASH} = \%navmaphash;
1727: $self->{PARM_HASH} = \%parmhash;
1728: $self->{PARM_CACHE} = {};
1729:
1730: bless($self);
1731:
1732: return $self;
1733: }
1734:
1735: sub generate_course_user_opt {
1736: my $self = shift;
1737: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1738:
1739: my $uname=$ENV{'user.name'};
1740: my $udom=$ENV{'user.domain'};
1741: my $uhome=$ENV{'user.home'};
1742: my $cid=$ENV{'request.course.id'};
1743: my $chome=$ENV{'course.'.$cid.'.home'};
1744: my ($cdom,$cnum)=split(/\_/,$cid);
1745:
1746: my $userprefix=$uname.'_'.$udom.'_';
1747:
1748: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1749: unless ($uhome eq 'no_host') {
1750: # ------------------------------------------------- Get coursedata (if present)
1751: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1752: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1753: ':resourcedata',$chome);
1754: # Check for network failure
1755: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1756: $self->{NETWORK_FAILURE} = 1;
1757: } elsif ($reply!~/^error\:/) {
1758: $courserdatas{$cid}=$reply;
1759: $courserdatas{$cid.'.last_cache'}=time;
1760: }
1761: }
1762: foreach (split(/\&/,$courserdatas{$cid})) {
1763: my ($name,$value)=split(/\=/,$_);
1764: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1765: &Apache::lonnet::unescape($value);
1766: }
1767: # --------------------------------------------------- Get userdata (if present)
1768: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1769: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1770: if ($reply!~/^error\:/) {
1771: $userrdatas{$uname.'___'.$udom}=$reply;
1772: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1773: }
1774: # check to see if network failed
1775: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1776: {
1777: $self->{NETWORK_FAILURE} = 1;
1778: }
1779: }
1780: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1781: my ($name,$value)=split(/\=/,$_);
1782: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1783: &Apache::lonnet::unescape($value);
1784: }
1785: $self->{COURSE_OPT} = \%courseopt;
1786: $self->{USER_OPT} = \%useropt;
1787: }
1788:
1789: $self->{COURSE_USER_OPT_GENERATED} = 1;
1790:
1791: return;
1792: }
1793:
1794: sub generate_email_discuss_status {
1795: my $self = shift;
1796: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1797:
1798: my $cid=$ENV{'request.course.id'};
1799: my ($cdom,$cnum)=split(/\_/,$cid);
1800:
1801: my %emailstatus = &Apache::lonnet::dump('email_status');
1802: my $logoutTime = $emailstatus{'logout'};
1803: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1804: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1805: $courseLeaveTime : $logoutTime);
1806: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1807: $cdom, $cnum);
1808: my %feedback=();
1809: my %error=();
1810: my $keys = &Apache::lonnet::reply('keys:'.
1811: $ENV{'user.domain'}.':'.
1812: $ENV{'user.name'}.':nohist_email',
1813: $ENV{'user.home'});
1814:
1815: foreach my $msgid (split(/\&/, $keys)) {
1816: $msgid=&Apache::lonnet::unescape($msgid);
1817: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1818: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1819: my ($what,$url)=($1,$2);
1820: my %status=
1821: &Apache::lonnet::get('email_status',[$msgid]);
1822: if ($status{$msgid}=~/^error\:/) {
1823: $status{$msgid}='';
1824: }
1825:
1826: if (($status{$msgid} eq 'new') ||
1827: (!$status{$msgid})) {
1828: if ($what eq 'Error') {
1829: $error{$url}.=','.$msgid;
1830: } else {
1831: $feedback{$url}.=','.$msgid;
1832: }
1833: }
1834: }
1835: }
1836:
1837: $self->{FEEDBACK} = \%feedback;
1838: $self->{ERROR_MSG} = \%error; # what is this? JB
1839: $self->{DISCUSSION_TIME} = \%discussiontime;
1840: $self->{EMAIL_STATUS} = \%emailstatus;
1841:
1842: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1843: }
1844:
1845: sub get_user_data {
1846: my $self = shift;
1847: if ($self->{RETRIEVED_USER_DATA}) { return; }
1848:
1849: # Retrieve performance data on problems
1850: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1851: $ENV{'user.domain'},
1852: $ENV{'user.name'});
1853: $self->{STUDENT_DATA} = \%student_data;
1854:
1855: $self->{RETRIEVED_USER_DATA} = 1;
1856: }
1857:
1858: # Internal function: Takes a key to look up in the nav hash and implements internal
1859: # memory caching of that key.
1860: sub navhash {
1861: my $self = shift; my $key = shift;
1862: return $self->{NAV_HASH}->{$key};
1863: }
1864:
1865: =pod
1866:
1867: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1868: false otherwise. Undefined course maps indicate an error somewhere in
1869: LON-CAPA, and you will not be able to proceed with using the navmap.
1870: See the B<NAV> screen for an example of using this.
1871:
1872: =cut
1873:
1874: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1875: sub courseMapDefined {
1876: my $self = shift;
1877: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1878:
1879: my $firstres = $self->navhash("map_start_$uri");
1880: my $lastres = $self->navhash("map_finish_$uri");
1881: return $firstres && $lastres;
1882: }
1883:
1884: sub getIterator {
1885: my $self = shift;
1886: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1887: shift, undef, shift);
1888: return $iterator;
1889: }
1890:
1891: # unties the hash when done
1892: sub untieHashes {
1893: my $self = shift;
1894: untie %{$self->{NAV_HASH}};
1895: untie %{$self->{PARM_HASH}};
1896: }
1897:
1898: # Private method: Does the given resource (as a symb string) have
1899: # current discussion? Returns 0 if chat/mail data not extracted.
1900: sub hasDiscussion {
1901: my $self = shift;
1902: my $symb = shift;
1903:
1904: $self->generate_email_discuss_status();
1905:
1906: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1907:
1908: #return defined($self->{DISCUSSION_TIME}->{$symb});
1909: return $self->{DISCUSSION_TIME}->{$symb} >
1910: $self->{LAST_CHECK};
1911: }
1912:
1913: # Private method: Does the given resource (as a symb string) have
1914: # current feedback? Returns the string in the feedback hash, which
1915: # will be false if it does not exist.
1916: sub getFeedback {
1917: my $self = shift;
1918: my $symb = shift;
1919:
1920: $self->generate_email_discuss_status();
1921:
1922: if (!defined($self->{FEEDBACK})) { return ""; }
1923:
1924: return $self->{FEEDBACK}->{$symb};
1925: }
1926:
1927: # Private method: Get the errors for that resource (by source).
1928: sub getErrors {
1929: my $self = shift;
1930: my $src = shift;
1931:
1932: $self->generate_email_discuss_status();
1933:
1934: if (!defined($self->{ERROR_MSG})) { return ""; }
1935: return $self->{ERROR_MSG}->{$src};
1936: }
1937:
1938: =pod
1939:
1940: =item * B<getById>(id):
1941:
1942: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1943: object for that resource. This method, or other methods that use it
1944: (as in the resource object) is the only proper way to obtain a
1945: resource object.
1946:
1947: =item * B<getBySymb>(symb):
1948:
1949: Based on the symb of the resource, get a resource object for that
1950: resource. This is one of the proper ways to get a resource object.
1951:
1952: =item * B<getMapByMapPc>(map_pc):
1953:
1954: Based on the map_pc of the resource, get a resource object for
1955: the given map. This is one of the proper ways to get a resource object.
1956:
1957: =cut
1958:
1959: # The strategy here is to cache the resource objects, and only construct them
1960: # as we use them. The real point is to prevent reading any more from the tied
1961: # hash then we have to, which should hopefully alleviate speed problems.
1962:
1963: sub getById {
1964: my $self = shift;
1965: my $id = shift;
1966:
1967: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1968: {
1969: return $self->{RESOURCE_CACHE}->{$id};
1970: }
1971:
1972: # resource handles inserting itself into cache.
1973: # Not clear why the quotes are necessary, but as of this
1974: # writing it doesn't work without them.
1975: return "Apache::lonnavmaps::resource"->new($self, $id);
1976: }
1977:
1978: sub getBySymb {
1979: my $self = shift;
1980: my $symb = shift;
1981: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1982: my $map = $self->getResourceByUrl($mapUrl);
1983: return $self->getById($map->map_pc() . '.' . $id);
1984: }
1985:
1986: sub getByMapPc {
1987: my $self = shift;
1988: my $map_pc = shift;
1989: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1990: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1991: return $self->getById($map_id);
1992: }
1993:
1994: =pod
1995:
1996: =item * B<firstResource>():
1997:
1998: Returns a resource object reference corresponding to the first
1999: resource in the navmap.
2000:
2001: =cut
2002:
2003: sub firstResource {
2004: my $self = shift;
2005: my $firstResource = $self->navhash('map_start_' .
2006: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2007: return $self->getById($firstResource);
2008: }
2009:
2010: =pod
2011:
2012: =item * B<finishResource>():
2013:
2014: Returns a resource object reference corresponding to the last resource
2015: in the navmap.
2016:
2017: =cut
2018:
2019: sub finishResource {
2020: my $self = shift;
2021: my $firstResource = $self->navhash('map_finish_' .
2022: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2023: return $self->getById($firstResource);
2024: }
2025:
2026: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2027: # the actual lookup; parmval caches the results.
2028: sub parmval {
2029: my $self = shift;
2030: my ($what,$symb)=@_;
2031: my $hashkey = $what."|||".$symb;
2032:
2033: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2034: return $self->{PARM_CACHE}->{$hashkey};
2035: }
2036:
2037: my $result = $self->parmval_real($what, $symb);
2038: $self->{PARM_CACHE}->{$hashkey} = $result;
2039: return $result;
2040: }
2041:
2042: sub parmval_real {
2043: my $self = shift;
2044: my ($what,$symb,$recurse) = @_;
2045:
2046: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2047: $self->generate_course_user_opt();
2048:
2049: my $cid=$ENV{'request.course.id'};
2050: my $csec=$ENV{'request.course.sec'};
2051: my $uname=$ENV{'user.name'};
2052: my $udom=$ENV{'user.domain'};
2053:
2054: unless ($symb) { return ''; }
2055: my $result='';
2056:
2057: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2058:
2059: # ----------------------------------------------------- Cascading lookup scheme
2060: my $rwhat=$what;
2061: $what=~s/^parameter\_//;
2062: $what=~s/\_/\./;
2063:
2064: my $symbparm=$symb.'.'.$what;
2065: my $mapparm=$mapname.'___(all).'.$what;
2066: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2067:
2068: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2069: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2070: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2071:
2072: my $courselevel= $usercourseprefix.'.'.$what;
2073: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2074: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2075:
2076: my $useropt = $self->{USER_OPT};
2077: my $courseopt = $self->{COURSE_OPT};
2078: my $parmhash = $self->{PARM_HASH};
2079:
2080: # ---------------------------------------------------------- first, check user
2081: if ($uname and defined($useropt)) {
2082: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2083: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2084: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2085: }
2086:
2087: # ------------------------------------------------------- second, check course
2088: if ($csec and defined($courseopt)) {
2089: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2090: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2091: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2092: }
2093:
2094: if (defined($courseopt)) {
2095: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2096: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2097: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2098: }
2099:
2100: # ----------------------------------------------------- third, check map parms
2101:
2102: my $thisparm=$$parmhash{$symbparm};
2103: if (defined($thisparm)) { return $thisparm; }
2104:
2105: # ----------------------------------------------------- fourth , check default
2106:
2107: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
2108: if (defined($default)) { return $default}
2109:
2110: # --------------------------------------------------- fifth , cascade up parts
2111:
2112: my ($space,@qualifier)=split(/\./,$rwhat);
2113: my $qualifier=join('.',@qualifier);
2114: unless ($space eq '0') {
2115: my @parts=split(/_/,$space);
2116: my $id=pop(@parts);
2117: my $part=join('_',@parts);
2118: if ($part eq '') { $part='0'; }
2119: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2120: if (defined($partgeneral)) { return $partgeneral; }
2121: }
2122: if ($recurse) { return undef; }
2123: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2124: if (defined($pack_def)) { return $pack_def; }
2125: return '';
2126: }
2127:
2128: =pod
2129:
2130: =item * B<getResourceByUrl>(url):
2131:
2132: Retrieves a resource object by URL of the resource. If passed a
2133: resource object, it will simply return it, so it is safe to use this
2134: method in code like "$res = $navmap->getResourceByUrl($res)", if
2135: you're not sure if $res is already an object, or just a URL. If the
2136: resource appears multiple times in the course, only the first instance
2137: will be returned. As a result, this is probably useful only for maps.
2138:
2139: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2140:
2141: The map is a specification of a map to retreive the resources from,
2142: either as a url or as an object. The filterFunc is a reference to a
2143: function that takes a resource object as its one argument and returns
2144: true if the resource should be included, or false if it should not
2145: be. If recursive is true, the map will be recursively examined,
2146: otherwise it will not be. If bailout is true, the function will return
2147: as soon as it finds a resource, if false it will finish. By default,
2148: the map is the top-level map of the course, filterFunc is a function
2149: that always returns 1, recursive is true, bailout is false. The
2150: resources will be returned in a list containing the resource objects
2151: for the corresponding resources, with B<no structure information> in
2152: the list; regardless of branching, recursion, etc., it will be a flat
2153: list.
2154:
2155: Thus, this is suitable for cases where you don't want the structure,
2156: just a list of all resources. It is also suitable for finding out how
2157: many resources match a given description; for this use, if all you
2158: want to know is if I<any> resources match the description, the bailout
2159: parameter will allow you to avoid potentially expensive enumeration of
2160: all matching resources.
2161:
2162: =item * B<hasResources>(map, filterFunc, recursive):
2163:
2164: Convience method for
2165:
2166: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2167:
2168: which will tell whether the map has resources matching the description
2169: in the filter function.
2170:
2171: =cut
2172:
2173: sub getResourceByUrl {
2174: my $self = shift;
2175: my $resUrl = shift;
2176:
2177: if (ref($resUrl)) { return $resUrl; }
2178:
2179: $resUrl = &Apache::lonnet::clutter($resUrl);
2180: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2181: if ($resId =~ /,/) {
2182: $resId = (split (/,/, $resId))[0];
2183: }
2184: if (!$resId) { return ''; }
2185: return $self->getById($resId);
2186: }
2187:
2188: sub retrieveResources {
2189: my $self = shift;
2190: my $map = shift;
2191: my $filterFunc = shift;
2192: if (!defined ($filterFunc)) {
2193: $filterFunc = sub {return 1;};
2194: }
2195: my $recursive = shift;
2196: if (!defined($recursive)) { $recursive = 1; }
2197: my $bailout = shift;
2198: if (!defined($bailout)) { $bailout = 0; }
2199:
2200: # Create the necessary iterator.
2201: if (!ref($map)) { # assume it's a url of a map.
2202: $map = $self->getResourceByUrl($map);
2203: }
2204:
2205: # If nothing was passed, assume top-level map
2206: if (!$map) {
2207: $map = $self->getById('0.0');
2208: }
2209:
2210: # Check the map's validity.
2211: if (!$map->is_map()) {
2212: # Oh, to throw an exception.... how I'd love that!
2213: return ();
2214: }
2215:
2216: # Get an iterator.
2217: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2218: undef, $recursive);
2219:
2220: my @resources = ();
2221:
2222: # Run down the iterator and collect the resources.
2223: my $curRes;
2224:
2225: while ($curRes = $it->next()) {
2226: if (ref($curRes)) {
2227: if (!&$filterFunc($curRes)) {
2228: next;
2229: }
2230:
2231: push @resources, $curRes;
2232:
2233: if ($bailout) {
2234: return @resources;
2235: }
2236: }
2237:
2238: }
2239:
2240: return @resources;
2241: }
2242:
2243: sub hasResource {
2244: my $self = shift;
2245: my $map = shift;
2246: my $filterFunc = shift;
2247: my $recursive = shift;
2248:
2249: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2250: }
2251:
2252: 1;
2253:
2254: package Apache::lonnavmaps::iterator;
2255:
2256: =pod
2257:
2258: =back
2259:
2260: =head1 Object: navmap Iterator
2261:
2262: An I<iterator> encapsulates the logic required to traverse a data
2263: structure. navmap uses an iterator to traverse the course map
2264: according to the criteria you wish to use.
2265:
2266: To obtain an iterator, call the B<getIterator>() function of a
2267: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2268: directly.) This will return a reference to the iterator:
2269:
2270: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2271:
2272: To get the next thing from the iterator, call B<next>:
2273:
2274: C<my $nextThing = $resourceIterator-E<gt>next()>
2275:
2276: getIterator behaves as follows:
2277:
2278: =over 4
2279:
2280: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2281:
2282: All parameters are optional. firstResource is a resource reference
2283: corresponding to where the iterator should start. It defaults to
2284: navmap->firstResource() for the corresponding nav map. finishResource
2285: corresponds to where you want the iterator to end, defaulting to
2286: navmap->finishResource(). filterHash is a hash used as a set
2287: containing strings representing the resource IDs, defaulting to
2288: empty. Condition is a 1 or 0 that sets what to do with the filter
2289: hash: If a 0, then only resources that exist IN the filterHash will be
2290: recursed on. If it is a 1, only resources NOT in the filterHash will
2291: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2292: false (default), the iterator will only return the first level of map
2293: that is not just a single, 'redirecting' map. If true, the iterator
2294: will return all information, starting with the top-level map,
2295: regardless of content. returnTopMap, if true (default false), will
2296: cause the iterator to return the top-level map object (resource 0.0)
2297: before anything else.
2298:
2299: Thus, by default, only top-level resources will be shown. Change the
2300: condition to a 1 without changing the hash, and all resources will be
2301: shown. Changing the condition to 1 and including some values in the
2302: hash will allow you to selectively suppress parts of the navmap, while
2303: leaving it on 0 and adding things to the hash will allow you to
2304: selectively add parts of the nav map. See the handler code for
2305: examples.
2306:
2307: The iterator will return either a reference to a resource object, or a
2308: token representing something in the map, such as the beginning of a
2309: new branch. The possible tokens are:
2310:
2311: =over 4
2312:
2313: =item * B<END_ITERATOR>:
2314:
2315: The iterator has returned all that it's going to. Further calls to the
2316: iterator will just produce more of these. This is a "false" value, and
2317: is the only false value the iterator which will be returned, so it can
2318: be used as a loop sentinel.
2319:
2320: =item * B<BEGIN_MAP>:
2321:
2322: A new map is being recursed into. This is returned I<after> the map
2323: resource itself is returned.
2324:
2325: =item * B<END_MAP>:
2326:
2327: The map is now done.
2328:
2329: =item * B<BEGIN_BRANCH>:
2330:
2331: A branch is now starting. The next resource returned will be the first
2332: in that branch.
2333:
2334: =item * B<END_BRANCH>:
2335:
2336: The branch is now done.
2337:
2338: =back
2339:
2340: The tokens are retreivable via methods on the iterator object, i.e.,
2341: $iterator->END_MAP.
2342:
2343: Maps can contain empty resources. The iterator will automatically skip
2344: over such resources, but will still treat the structure
2345: correctly. Thus, a complicated map with several branches, but
2346: consisting entirely of empty resources except for one beginning or
2347: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2348: but only one resource will be returned.
2349:
2350: =head2 Normal Usage
2351:
2352: Normal usage of the iterator object is to do the following:
2353:
2354: my $it = $navmap->getIterator([your params here]);
2355: my $curRes;
2356: while ($curRes = $it->next()) {
2357: [your logic here]
2358: }
2359:
2360: Note that inside of the loop, it's frequently useful to check if
2361: "$curRes" is a reference or not with the reference function; only
2362: resource objects will be references, and any non-references will
2363: be the tokens described above.
2364:
2365: Also note there is some old code floating around that trys to track
2366: the depth of the iterator to see when it's done; do not copy that
2367: code. It is difficult to get right and harder to understand then
2368: this. They should be migrated to this new style.
2369:
2370: =back
2371:
2372: =cut
2373:
2374: # Here are the tokens for the iterator:
2375:
2376: sub END_ITERATOR { return 0; }
2377: sub BEGIN_MAP { return 1; } # begining of a new map
2378: sub END_MAP { return 2; } # end of the map
2379: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2380: sub END_BRANCH { return 4; } # end of a branch
2381: sub FORWARD { return 1; } # go forward
2382: sub BACKWARD { return 2; }
2383:
2384: sub min {
2385: (my $a, my $b) = @_;
2386: if ($a < $b) { return $a; } else { return $b; }
2387: }
2388:
2389: sub new {
2390: # magic invocation to create a class instance
2391: my $proto = shift;
2392: my $class = ref($proto) || $proto;
2393: my $self = {};
2394:
2395: $self->{NAV_MAP} = shift;
2396: return undef unless ($self->{NAV_MAP});
2397:
2398: # Handle the parameters
2399: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2400: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2401:
2402: # If the given resources are just the ID of the resource, get the
2403: # objects
2404: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2405: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2406: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2407: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2408:
2409: $self->{FILTER} = shift;
2410:
2411: # A hash, used as a set, of resource already seen
2412: $self->{ALREADY_SEEN} = shift;
2413: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2414: $self->{CONDITION} = shift;
2415:
2416: # Do we want to automatically follow "redirection" maps?
2417: $self->{FORCE_TOP} = shift;
2418:
2419: # Do we want to return the top-level map object (resource 0.0)?
2420: $self->{RETURN_0} = shift;
2421: # have we done that yet?
2422: $self->{HAVE_RETURNED_0} = 0;
2423:
2424: # Now, we need to pre-process the map, by walking forward and backward
2425: # over the parts of the map we're going to look at.
2426:
2427: # The processing steps are exactly the same, except for a few small
2428: # changes, so I bundle those up in the following list of two elements:
2429: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2430: # first_resource).
2431: # This prevents writing nearly-identical code twice.
2432: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2433: 'FIRST_RESOURCE'],
2434: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2435: 'FINISH_RESOURCE'] );
2436:
2437: my $maxDepth = 0; # tracks max depth
2438:
2439: # If there is only one resource in this map, and it's a map, we
2440: # want to remember that, so the user can ask for the first map
2441: # that isn't just a redirector.
2442: my $resource; my $resourceCount = 0;
2443:
2444: # Documentation on this algorithm can be found in the CVS repository at
2445: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2446: # in that file.
2447: # **1**
2448:
2449: foreach my $pass (@iterations) {
2450: my $direction = $pass->[0];
2451: my $valName = $pass->[1];
2452: my $nextResourceMethod = $pass->[2];
2453: my $firstResourceName = $pass->[3];
2454:
2455: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2456: $self->{FIRST_RESOURCE},
2457: $self->{FINISH_RESOURCE},
2458: {}, undef, 0, $direction);
2459:
2460: # prime the recursion
2461: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2462: $iterator->next();
2463: my $curRes = $iterator->next();
2464: my $depth = 1;
2465: while ($depth > 0) {
2466: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2467: if ($curRes == $iterator->END_MAP()) { $depth--; }
2468:
2469: if (ref($curRes)) {
2470: # If there's only one resource, this will save it
2471: # we have to filter empty resources from consideration here,
2472: # or even "empty", redirecting maps have two (start & finish)
2473: # or three (start, finish, plus redirector)
2474: if($direction == FORWARD && $curRes->src()) {
2475: $resource = $curRes; $resourceCount++;
2476: }
2477: my $resultingVal = $curRes->{DATA}->{$valName};
2478: my $nextResources = $curRes->$nextResourceMethod();
2479: my $nextCount = scalar(@{$nextResources});
2480:
2481: if ($nextCount == 1) { # **3**
2482: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2483: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2484: }
2485:
2486: if ($nextCount > 1) { # **4**
2487: foreach my $res (@{$nextResources}) {
2488: my $current = $res->{DATA}->{$valName} || 999999999;
2489: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2490: }
2491: }
2492: }
2493:
2494: # Assign the final val (**2**)
2495: if (ref($curRes) && $direction == BACKWARD()) {
2496: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2497: $curRes->{DATA}->{BOT_UP_VAL});
2498:
2499: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2500: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2501: }
2502:
2503: $curRes = $iterator->next();
2504: }
2505: }
2506:
2507: # Check: Was this only one resource, a map?
2508: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2509: my $firstResource = $resource->map_start();
2510: my $finishResource = $resource->map_finish();
2511: return
2512: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2513: $finishResource, $self->{FILTER},
2514: $self->{ALREADY_SEEN},
2515: $self->{CONDITION}, 0);
2516:
2517: }
2518:
2519: # Set up some bookkeeping information.
2520: $self->{CURRENT_DEPTH} = 0;
2521: $self->{MAX_DEPTH} = $maxDepth;
2522: $self->{STACK} = [];
2523: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2524: $self->{FINISHED} = 0; # When true, the iterator has finished
2525:
2526: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2527: push @{$self->{STACK}}, [];
2528: }
2529:
2530: # Prime the recursion w/ the first resource **5**
2531: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2532: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2533:
2534: bless ($self);
2535:
2536: return $self;
2537: }
2538:
2539: sub next {
2540: my $self = shift;
2541:
2542: if ($self->{FINISHED}) {
2543: return END_ITERATOR();
2544: }
2545:
2546: # If we want to return the top-level map object, and haven't yet,
2547: # do so.
2548: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2549: $self->{HAVE_RETURNED_0} = 1;
2550: return $self->{NAV_MAP}->getById('0.0');
2551: }
2552:
2553: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2554: # grab the next from the recursive iterator
2555: my $next = $self->{RECURSIVE_ITERATOR}->next();
2556:
2557: # is it a begin or end map? If so, update the depth
2558: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2559: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2560:
2561: # Are we back at depth 0? If so, stop recursing
2562: if ($self->{RECURSIVE_DEPTH} == 0) {
2563: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2564: }
2565:
2566: return $next;
2567: }
2568:
2569: if (defined($self->{FORCE_NEXT})) {
2570: my $tmp = $self->{FORCE_NEXT};
2571: $self->{FORCE_NEXT} = undef;
2572: return $tmp;
2573: }
2574:
2575: # Have we not yet begun? If not, return BEGIN_MAP and
2576: # remember we've started.
2577: if ( !$self->{STARTED} ) {
2578: $self->{STARTED} = 1;
2579: return $self->BEGIN_MAP();
2580: }
2581:
2582: # Here's the guts of the iterator.
2583:
2584: # Find the next resource, if any.
2585: my $found = 0;
2586: my $i = $self->{MAX_DEPTH};
2587: my $newDepth;
2588: my $here;
2589: while ( $i >= 0 && !$found ) {
2590: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2591: $here = pop @{$self->{STACK}->[$i]}; # **7**
2592: $found = 1;
2593: $newDepth = $i;
2594: }
2595: $i--;
2596: }
2597:
2598: # If we still didn't find anything, we're done.
2599: if ( !$found ) {
2600: # We need to get back down to the correct branch depth
2601: if ( $self->{CURRENT_DEPTH} > 0 ) {
2602: $self->{CURRENT_DEPTH}--;
2603: return END_BRANCH();
2604: } else {
2605: $self->{FINISHED} = 1;
2606: return END_MAP();
2607: }
2608: }
2609:
2610: # If this is not a resource, it must be an END_BRANCH marker we want
2611: # to return directly.
2612: if (!ref($here)) { # **8**
2613: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2614: $self->{CURRENT_DEPTH}--;
2615: return $here;
2616: }
2617: }
2618:
2619: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2620: $self->{HERE} = $here;
2621:
2622: # Get to the right level
2623: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2624: push @{$self->{STACK}->[$newDepth]}, $here;
2625: $self->{CURRENT_DEPTH}--;
2626: return END_BRANCH();
2627: }
2628: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2629: push @{$self->{STACK}->[$newDepth]}, $here;
2630: $self->{CURRENT_DEPTH}++;
2631: return BEGIN_BRANCH();
2632: }
2633:
2634: # If we made it here, we have the next resource, and we're at the
2635: # right branch level. So let's examine the resource for where
2636: # we can get to from here.
2637:
2638: # So we need to look at all the resources we can get to from here,
2639: # categorize them if we haven't seen them, remember if we have a new
2640: my $nextUnfiltered = $here->getNext();
2641: my $maxDepthAdded = -1;
2642:
2643: for (@$nextUnfiltered) {
2644: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2645: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2646: push @{$self->{STACK}->[$depth]}, $_;
2647: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2648: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2649: }
2650: }
2651:
2652: # Is this the end of a branch? If so, all of the resources examined above
2653: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2654: # marker onto the stack so we don't forget.
2655: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2656: # BC branch and gets to C, it will see F as the only next resource, but it's
2657: # one level lower. Thus, this is the end of the branch, since there are no
2658: # more resources added to this level or above.
2659: # We don't do this if the examined resource is the finish resource,
2660: # because the condition given above is true, but the "END_MAP" will
2661: # take care of things and we should already be at depth 0.
2662: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2663: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2664: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2665: }
2666:
2667: # That ends the main iterator logic. Now, do we want to recurse
2668: # down this map (if this resource is a map)?
2669: if ($self->{HERE}->is_map() &&
2670: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2671: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2672: my $firstResource = $self->{HERE}->map_start();
2673: my $finishResource = $self->{HERE}->map_finish();
2674:
2675: $self->{RECURSIVE_ITERATOR} =
2676: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2677: $finishResource, $self->{FILTER},
2678: $self->{ALREADY_SEEN}, $self->{CONDITION});
2679: }
2680:
2681: # If this is a blank resource, don't actually return it.
2682: # Should you ever find you need it, make sure to add an option to the code
2683: # that you can use; other things depend on this behavior.
2684: my $browsePriv = $self->{HERE}->browsePriv();
2685: if (!$self->{HERE}->src() ||
2686: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2687: return $self->next();
2688: }
2689:
2690: return $self->{HERE};
2691:
2692: }
2693:
2694: =pod
2695:
2696: The other method available on the iterator is B<getStack>, which
2697: returns an array populated with the current 'stack' of maps, as
2698: references to the resource objects. Example: This is useful when
2699: making the navigation map, as we need to check whether we are under a
2700: page map to see if we need to link directly to the resource, or to the
2701: page. The first elements in the array will correspond to the top of
2702: the stack (most inclusive map).
2703:
2704: =cut
2705:
2706: sub getStack {
2707: my $self=shift;
2708:
2709: my @stack;
2710:
2711: $self->populateStack(\@stack);
2712:
2713: return \@stack;
2714: }
2715:
2716: # Private method: Calls the iterators recursively to populate the stack.
2717: sub populateStack {
2718: my $self=shift;
2719: my $stack = shift;
2720:
2721: push @$stack, $self->{HERE} if ($self->{HERE});
2722:
2723: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2724: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2725: }
2726: }
2727:
2728: 1;
2729:
2730: package Apache::lonnavmaps::DFSiterator;
2731:
2732: # Not documented in the perldoc: This is a simple iterator that just walks
2733: # through the nav map and presents the resources in a depth-first search
2734: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2735: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2736: # useful for pre-processing of some kind, and is in fact used by the main
2737: # iterator that way, but that's about it.
2738: # One could imagine merging this into the init routine of the main iterator,
2739: # but this might as well be left seperate, since it is possible some other
2740: # use might be found for it. - Jeremy
2741:
2742: # Unlike the main iterator, this DOES return all resources, even blank ones.
2743: # The main iterator needs them to correctly preprocess the map.
2744:
2745: sub BEGIN_MAP { return 1; } # begining of a new map
2746: sub END_MAP { return 2; } # end of the map
2747: sub FORWARD { return 1; } # go forward
2748: sub BACKWARD { return 2; }
2749:
2750: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2751: # filter hash ref (or undef), already seen hash or undef, condition
2752: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2753: sub new {
2754: # magic invocation to create a class instance
2755: my $proto = shift;
2756: my $class = ref($proto) || $proto;
2757: my $self = {};
2758:
2759: $self->{NAV_MAP} = shift;
2760: return undef unless ($self->{NAV_MAP});
2761:
2762: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2763: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2764:
2765: # If the given resources are just the ID of the resource, get the
2766: # objects
2767: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2768: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2769: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2770: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2771:
2772: $self->{FILTER} = shift;
2773:
2774: # A hash, used as a set, of resource already seen
2775: $self->{ALREADY_SEEN} = shift;
2776: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2777: $self->{CONDITION} = shift;
2778: $self->{DIRECTION} = shift || FORWARD();
2779:
2780: # Flag: Have we started yet?
2781: $self->{STARTED} = 0;
2782:
2783: # Should we continue calling the recursive iterator, if any?
2784: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2785: # The recursive iterator, if any
2786: $self->{RECURSIVE_ITERATOR} = undef;
2787: # Are we recursing on a map, or a branch?
2788: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2789: # And the count of how deep it is, so that this iterator can keep track of
2790: # when to pick back up again.
2791: $self->{RECURSIVE_DEPTH} = 0;
2792:
2793: # For keeping track of our branches, we maintain our own stack
2794: $self->{STACK} = [];
2795:
2796: # Start with the first resource
2797: if ($self->{DIRECTION} == FORWARD) {
2798: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2799: } else {
2800: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2801: }
2802:
2803: bless($self);
2804: return $self;
2805: }
2806:
2807: sub next {
2808: my $self = shift;
2809:
2810: # Are we using a recursive iterator? If so, pull from that and
2811: # watch the depth; we want to resume our level at the correct time.
2812: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2813: # grab the next from the recursive iterator
2814: my $next = $self->{RECURSIVE_ITERATOR}->next();
2815:
2816: # is it a begin or end map? Update depth if so
2817: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2818: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2819:
2820: # Are we back at depth 0? If so, stop recursing.
2821: if ($self->{RECURSIVE_DEPTH} == 0) {
2822: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2823: }
2824:
2825: return $next;
2826: }
2827:
2828: # Is there a current resource to grab? If not, then return
2829: # END_MAP, which will end the iterator.
2830: if (scalar(@{$self->{STACK}}) == 0) {
2831: return $self->END_MAP();
2832: }
2833:
2834: # Have we not yet begun? If not, return BEGIN_MAP and
2835: # remember that we've started.
2836: if ( !$self->{STARTED} ) {
2837: $self->{STARTED} = 1;
2838: return $self->BEGIN_MAP;
2839: }
2840:
2841: # Get the next resource in the branch
2842: $self->{HERE} = pop @{$self->{STACK}};
2843:
2844: # remember that we've seen this, so we don't return it again later
2845: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2846:
2847: # Get the next possible resources
2848: my $nextUnfiltered;
2849: if ($self->{DIRECTION} == FORWARD()) {
2850: $nextUnfiltered = $self->{HERE}->getNext();
2851: } else {
2852: $nextUnfiltered = $self->{HERE}->getPrevious();
2853: }
2854: my $next = [];
2855:
2856: # filter the next possibilities to remove things we've
2857: # already seen.
2858: foreach (@$nextUnfiltered) {
2859: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2860: push @$next, $_;
2861: }
2862: }
2863:
2864: while (@$next) {
2865: # copy the next possibilities over to the stack
2866: push @{$self->{STACK}}, shift @$next;
2867: }
2868:
2869: # If this is a map and we want to recurse down it... (not filtered out)
2870: if ($self->{HERE}->is_map() &&
2871: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2872: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2873: my $firstResource = $self->{HERE}->map_start();
2874: my $finishResource = $self->{HERE}->map_finish();
2875:
2876: $self->{RECURSIVE_ITERATOR} =
2877: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2878: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2879: $self->{CONDITION}, $self->{DIRECTION});
2880: }
2881:
2882: return $self->{HERE};
2883: }
2884:
2885: # Identical to the full iterator methods of the same name. Hate to copy/paste
2886: # but I also hate to "inherit" either iterator from the other.
2887:
2888: sub getStack {
2889: my $self=shift;
2890:
2891: my @stack;
2892:
2893: $self->populateStack(\@stack);
2894:
2895: return \@stack;
2896: }
2897:
2898: # Private method: Calls the iterators recursively to populate the stack.
2899: sub populateStack {
2900: my $self=shift;
2901: my $stack = shift;
2902:
2903: push @$stack, $self->{HERE} if ($self->{HERE});
2904:
2905: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2906: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2907: }
2908: }
2909:
2910: 1;
2911:
2912: package Apache::lonnavmaps::resource;
2913:
2914: use Apache::lonnet;
2915:
2916: =pod
2917:
2918: =head1 Object: resource
2919:
2920: X<resource, navmap object>
2921: A resource object encapsulates a resource in a resource map, allowing
2922: easy manipulation of the resource, querying the properties of the
2923: resource (including user properties), and represents a reference that
2924: can be used as the canonical representation of the resource by
2925: lonnavmap clients like renderers.
2926:
2927: A resource only makes sense in the context of a navmap, as some of the
2928: data is stored in the navmap object.
2929:
2930: You will probably never need to instantiate this object directly. Use
2931: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2932: starting resource.
2933:
2934: Resource objects respect the parameter_hiddenparts, which suppresses
2935: various parts according to the wishes of the map author. As of this
2936: writing, there is no way to override this parameter, and suppressed
2937: parts will never be returned, nor will their response types or ids be
2938: stored.
2939:
2940: =head2 Overview
2941:
2942: A B<Resource> is the most granular type of object in LON-CAPA that can
2943: be included in a course. It can either be a particular resource, like
2944: an HTML page, external resource, problem, etc., or it can be a
2945: container sequence, such as a "page" or a "map".
2946:
2947: To see a sequence from the user's point of view, please see the
2948: B<Creating a Course: Maps and Sequences> chapter of the Author's
2949: Manual.
2950:
2951: A Resource Object, once obtained from a navmap object via a B<getBy*>
2952: method of the navmap, or from an iterator, allows you to query
2953: information about that resource.
2954:
2955: Generally, you do not ever want to create a resource object yourself,
2956: so creation has been left undocumented. Always retrieve resources
2957: from navmap objects.
2958:
2959: =head3 Identifying Resources
2960:
2961: X<big hash>Every resource is identified by a Resource ID in the big hash that is
2962: unique to that resource for a given course. X<resource ID, in big hash>
2963: The Resource ID has the form #.#, where the first number is the same
2964: for every resource in a map, and the second is unique. For instance,
2965: for a course laid out like this:
2966:
2967: * Problem 1
2968: * Map
2969: * Resource 2
2970: * Resource 3
2971:
2972: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
2973: C<Resource 3> will share a first number. The second number may end up
2974: re-used between the two groups.
2975:
2976: The resource ID is only used in the big hash, but can be used in the
2977: context of a course to identify a resource easily. (For instance, the
2978: printing system uses it to record which resources from a sequence you
2979: wish to print.)
2980:
2981: X<symb> X<resource, symb>
2982: All resources also have B<symb>s, which uniquely identify a resource
2983: in a course. Many internal LON-CAPA functions expect a symb. A symb
2984: carries along with it the URL of the resource, and the map it appears
2985: in. Symbs are much larger then resource IDs.
2986:
2987: =cut
2988:
2989: sub new {
2990: # magic invocation to create a class instance
2991: my $proto = shift;
2992: my $class = ref($proto) || $proto;
2993: my $self = {};
2994:
2995: $self->{NAV_MAP} = shift;
2996: $self->{ID} = shift;
2997:
2998: # Store this new resource in the parent nav map's cache.
2999: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3000: $self->{RESOURCE_ERROR} = 0;
3001:
3002: # A hash that can be used by two-pass algorithms to store data
3003: # about this resource in. Not used by the resource object
3004: # directly.
3005: $self->{DATA} = {};
3006:
3007: bless($self);
3008:
3009: return $self;
3010: }
3011:
3012: # private function: simplify the NAV_HASH lookups we keep doing
3013: # pass the name, and to automatically append my ID, pass a true val on the
3014: # second param
3015: sub navHash {
3016: my $self = shift;
3017: my $param = shift;
3018: my $id = shift;
3019: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3020: }
3021:
3022: =pod
3023:
3024: =head2 Methods
3025:
3026: Once you have a resource object, here's what you can do with it:
3027:
3028: =head3 Attribute Retrieval
3029:
3030: Every resource has certain attributes that can be retrieved and used:
3031:
3032: =over 4
3033:
3034: =item * B<ID>: Every resource has an ID that is unique for that
3035: resource in the course it is in. The ID is actually in the hash
3036: representing the resource, so for a resource object $res, obtain
3037: it via C<$res->{ID}).
3038:
3039: =item * B<compTitle>:
3040:
3041: Returns a "composite title", that is equal to $res->title() if the
3042: resource has a title, and is otherwise the last part of the URL (e.g.,
3043: "problem.problem").
3044:
3045: =item * B<ext>:
3046:
3047: Returns true if the resource is external.
3048:
3049: =item * B<kind>:
3050:
3051: Returns the kind of the resource from the compiled nav map.
3052:
3053: =item * B<randomout>:
3054:
3055: Returns true if this resource was chosen to NOT be shown to the user
3056: by the random map selection feature. In other words, this is usually
3057: false.
3058:
3059: =item * B<randompick>:
3060:
3061: Returns true for a map if the randompick feature is being used on the
3062: map. (?)
3063:
3064: =item * B<src>:
3065:
3066: Returns the source for the resource.
3067:
3068: =item * B<symb>:
3069:
3070: Returns the symb for the resource.
3071:
3072: =item * B<title>:
3073:
3074: Returns the title of the resource.
3075:
3076: =back
3077:
3078: =cut
3079:
3080: # These info functions can be used directly, as they don't return
3081: # resource information.
3082: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3083: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3084: sub from { my $self=shift; return $self->navHash("from_", 1); }
3085: # considered private and undocumented
3086: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3087: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3088: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3089: sub randompick {
3090: my $self = shift;
3091: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3092: '.0.parameter_randompick'};
3093: }
3094: sub src {
3095: my $self=shift;
3096: return $self->navHash("src_", 1);
3097: }
3098: sub symb {
3099: my $self=shift;
3100: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3101: my $symbSrc = &Apache::lonnet::declutter($self->src());
3102: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3103: . '___' . $second . '___' . $symbSrc;
3104: return &Apache::lonnet::symbclean($symb);
3105: }
3106: sub title {
3107: my $self=shift;
3108: if ($self->{ID} eq '0.0') {
3109: # If this is the top-level map, return the title of the course
3110: # since this map can not be titled otherwise.
3111: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3112: }
3113: return $self->navHash("title_", 1); }
3114: # considered private and undocumented
3115: sub to { my $self=shift; return $self->navHash("to_", 1); }
3116: sub compTitle {
3117: my $self = shift;
3118: my $title = $self->title();
3119: $title=~s/\&colon\;/\:/gs;
3120: if (!$title) {
3121: $title = $self->src();
3122: $title = substr($title, rindex($title, '/') + 1);
3123: }
3124: return $title;
3125: }
3126: =pod
3127:
3128: B<Predicate Testing the Resource>
3129:
3130: These methods are shortcuts to deciding if a given resource has a given property.
3131:
3132: =over 4
3133:
3134: =item * B<is_map>:
3135:
3136: Returns true if the resource is a map type.
3137:
3138: =item * B<is_problem>:
3139:
3140: Returns true if the resource is a problem type, false
3141: otherwise. (Looks at the extension on the src field; might need more
3142: to work correctly.)
3143:
3144: =item * B<is_page>:
3145:
3146: Returns true if the resource is a page.
3147:
3148: =item * B<is_sequence>:
3149:
3150: Returns true if the resource is a sequence.
3151:
3152: =back
3153:
3154: =cut
3155:
3156:
3157: sub is_html {
3158: my $self=shift;
3159: my $src = $self->src();
3160: return ($src =~ /html$/);
3161: }
3162: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3163: sub is_page {
3164: my $self=shift;
3165: my $src = $self->src();
3166: return $self->navHash("is_map_", 1) &&
3167: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3168: }
3169: sub is_problem {
3170: my $self=shift;
3171: my $src = $self->src();
3172: return ($src =~ /problem$/);
3173: }
3174: sub is_sequence {
3175: my $self=shift;
3176: my $src = $self->src();
3177: return $self->navHash("is_map_", 1) &&
3178: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3179: }
3180:
3181: # Private method: Shells out to the parmval in the nav map, handler parts.
3182: sub parmval {
3183: my $self = shift;
3184: my $what = shift;
3185: my $part = shift;
3186: if (!defined($part)) {
3187: $part = '0';
3188: }
3189: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3190: }
3191:
3192: =pod
3193:
3194: B<Map Methods>
3195:
3196: These methods are useful for getting information about the map
3197: properties of the resource, if the resource is a map (B<is_map>).
3198:
3199: =over 4
3200:
3201: =item * B<map_finish>:
3202:
3203: Returns a reference to a resource object corresponding to the finish
3204: resource of the map.
3205:
3206: =item * B<map_pc>:
3207:
3208: Returns the pc value of the map, which is the first number that
3209: appears in the resource ID of the resources in the map, and is the
3210: number that appears around the middle of the symbs of the resources in
3211: that map.
3212:
3213: =item * B<map_start>:
3214:
3215: Returns a reference to a resource object corresponding to the start
3216: resource of the map.
3217:
3218: =item * B<map_type>:
3219:
3220: Returns a string with the type of the map in it.
3221:
3222: =back
3223:
3224: =cut
3225:
3226: sub map_finish {
3227: my $self = shift;
3228: my $src = $self->src();
3229: $src = Apache::lonnet::clutter($src);
3230: my $res = $self->navHash("map_finish_$src", 0);
3231: $res = $self->{NAV_MAP}->getById($res);
3232: return $res;
3233: }
3234: sub map_pc {
3235: my $self = shift;
3236: my $src = $self->src();
3237: return $self->navHash("map_pc_$src", 0);
3238: }
3239: sub map_start {
3240: my $self = shift;
3241: my $src = $self->src();
3242: $src = Apache::lonnet::clutter($src);
3243: my $res = $self->navHash("map_start_$src", 0);
3244: $res = $self->{NAV_MAP}->getById($res);
3245: return $res;
3246: }
3247: sub map_type {
3248: my $self = shift;
3249: my $pc = $self->map_pc();
3250: return $self->navHash("map_type_$pc", 0);
3251: }
3252:
3253: #####
3254: # Property queries
3255: #####
3256:
3257: # These functions will be responsible for returning the CORRECT
3258: # VALUE for the parameter, no matter what. So while they may look
3259: # like direct calls to parmval, they can be more then that.
3260: # So, for instance, the duedate function should use the "duedatetype"
3261: # information, rather then the resource object user.
3262:
3263: =pod
3264:
3265: =head2 Resource Parameters
3266:
3267: In order to use the resource parameters correctly, the nav map must
3268: have been instantiated with genCourseAndUserOptions set to true, so
3269: the courseopt and useropt is read correctly. Then, you can call these
3270: functions to get the relevant parameters for the resource. Each
3271: function defaults to part "0", but can be directed to another part by
3272: passing the part as the parameter.
3273:
3274: These methods are responsible for getting the parameter correct, not
3275: merely reflecting the contents of the GDBM hashes. As we move towards
3276: dates relative to other dates, these methods should be updated to
3277: reflect that. (Then, anybody using these methods will not have to update
3278: their code.)
3279:
3280: =over 4
3281:
3282: =item * B<acc>:
3283:
3284: Get the Client IP/Name Access Control information.
3285:
3286: =item * B<answerdate>:
3287:
3288: Get the answer-reveal date for the problem.
3289:
3290: =item * B<awarded>:
3291:
3292: Gets the awarded value for the problem part. Requires genUserData set to
3293: true when the navmap object was created.
3294:
3295: =item * B<duedate>:
3296:
3297: Get the due date for the problem.
3298:
3299: =item * B<tries>:
3300:
3301: Get the number of tries the student has used on the problem.
3302:
3303: =item * B<maxtries>:
3304:
3305: Get the number of max tries allowed.
3306:
3307: =item * B<opendate>:
3308:
3309: Get the open date for the problem.
3310:
3311: =item * B<sig>:
3312:
3313: Get the significant figures setting.
3314:
3315: =item * B<tol>:
3316:
3317: Get the tolerance for the problem.
3318:
3319: =item * B<tries>:
3320:
3321: Get the number of tries the user has already used on the problem.
3322:
3323: =item * B<type>:
3324:
3325: Get the question type for the problem.
3326:
3327: =item * B<weight>:
3328:
3329: Get the weight for the problem.
3330:
3331: =back
3332:
3333: =cut
3334:
3335: sub acc {
3336: (my $self, my $part) = @_;
3337: return $self->parmval("acc", $part);
3338: }
3339: sub answerdate {
3340: (my $self, my $part) = @_;
3341: # Handle intervals
3342: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3343: return $self->duedate($part) +
3344: $self->parmval("answerdate", $part);
3345: }
3346: return $self->parmval("answerdate", $part);
3347: }
3348: sub awarded {
3349: my $self = shift; my $part = shift;
3350: $self->{NAV_MAP}->get_user_data();
3351: if (!defined($part)) { $part = '0'; }
3352: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3353: }
3354: sub duedate {
3355: (my $self, my $part) = @_;
3356: return $self->parmval("duedate", $part);
3357: }
3358: sub maxtries {
3359: (my $self, my $part) = @_;
3360: return $self->parmval("maxtries", $part);
3361: }
3362: sub opendate {
3363: (my $self, my $part) = @_;
3364: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3365: return $self->duedate($part) -
3366: $self->parmval("opendate", $part);
3367: }
3368: return $self->parmval("opendate");
3369: }
3370: sub problemstatus {
3371: (my $self, my $part) = @_;
3372: return $self->parmval("problemstatus", $part);
3373: }
3374: sub sig {
3375: (my $self, my $part) = @_;
3376: return $self->parmval("sig", $part);
3377: }
3378: sub tol {
3379: (my $self, my $part) = @_;
3380: return $self->parmval("tol", $part);
3381: }
3382: sub tries {
3383: my $self = shift;
3384: my $tries = $self->queryRestoreHash('tries', shift);
3385: if (!defined($tries)) { return '0';}
3386: return $tries;
3387: }
3388: sub type {
3389: (my $self, my $part) = @_;
3390: return $self->parmval("type", $part);
3391: }
3392: sub weight {
3393: my $self = shift; my $part = shift;
3394: if (!defined($part)) { $part = '0'; }
3395: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3396: $self->symb(), $ENV{'user.domain'},
3397: $ENV{'user.name'},
3398: $ENV{'request.course.sec'});
3399:
3400: }
3401:
3402: # Multiple things need this
3403: sub getReturnHash {
3404: my $self = shift;
3405:
3406: if (!defined($self->{RETURN_HASH})) {
3407: my %tmpHash = &Apache::lonnet::restore($self->symb());
3408: $self->{RETURN_HASH} = \%tmpHash;
3409: }
3410: }
3411:
3412: ######
3413: # Status queries
3414: ######
3415:
3416: # These methods query the status of problems.
3417:
3418: # If we need to count parts, this function determines the number of
3419: # parts from the metadata. When called, it returns a reference to a list
3420: # of strings corresponding to the parts. (Thus, using it in a scalar context
3421: # tells you how many parts you have in the problem:
3422: # $partcount = scalar($resource->countParts());
3423: # Don't use $self->{PARTS} directly because you don't know if it's been
3424: # computed yet.
3425:
3426: =pod
3427:
3428: =head2 Resource misc
3429:
3430: Misc. functions for the resource.
3431:
3432: =over 4
3433:
3434: =item * B<hasDiscussion>:
3435:
3436: Returns a false value if there has been discussion since the user last
3437: logged in, true if there has. Always returns false if the discussion
3438: data was not extracted when the nav map was constructed.
3439:
3440: =item * B<getFeedback>:
3441:
3442: Gets the feedback for the resource and returns the raw feedback string
3443: for the resource, or the null string if there is no feedback or the
3444: email data was not extracted when the nav map was constructed. Usually
3445: used like this:
3446:
3447: for (split(/\,/, $res->getFeedback())) {
3448: my $link = &Apache::lonnet::escape($_);
3449: ...
3450:
3451: and use the link as appropriate.
3452:
3453: =cut
3454:
3455: sub hasDiscussion {
3456: my $self = shift;
3457: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3458: }
3459:
3460: sub getFeedback {
3461: my $self = shift;
3462: my $source = $self->src();
3463: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3464: return $self->{NAV_MAP}->getFeedback($source);
3465: }
3466:
3467: sub getErrors {
3468: my $self = shift;
3469: my $source = $self->src();
3470: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3471: return $self->{NAV_MAP}->getErrors($source);
3472: }
3473:
3474: =pod
3475:
3476: =item * B<parts>():
3477:
3478: Returns a list reference containing sorted strings corresponding to
3479: each part of the problem. Single part problems have only a part '0'.
3480: Multipart problems do not return their part '0', since they typically
3481: do not really matter.
3482:
3483: =item * B<countParts>():
3484:
3485: Returns the number of parts of the problem a student can answer. Thus,
3486: for single part problems, returns 1. For multipart, it returns the
3487: number of parts in the problem, not including psuedo-part 0.
3488:
3489: =item * B<multipart>():
3490:
3491: Returns true if the problem is multipart, false otherwise. Use this instead
3492: of countParts if all you want is multipart/not multipart.
3493:
3494: =item * B<responseType>($part):
3495:
3496: Returns the response type of the part, without the word "response" on the
3497: end. Example return values: 'string', 'essay', 'numeric', etc.
3498:
3499: =item * B<responseIds>($part):
3500:
3501: Retreives the response IDs for the given part as an array reference containing
3502: strings naming the response IDs. This may be empty.
3503:
3504: =back
3505:
3506: =cut
3507:
3508: sub parts {
3509: my $self = shift;
3510:
3511: if ($self->ext) { return []; }
3512:
3513: $self->extractParts();
3514: return $self->{PARTS};
3515: }
3516:
3517: sub countParts {
3518: my $self = shift;
3519:
3520: my $parts = $self->parts();
3521:
3522: # If I left this here, then it's not necessary.
3523: #my $delta = 0;
3524: #for my $part (@$parts) {
3525: # if ($part eq '0') { $delta--; }
3526: #}
3527:
3528: if ($self->{RESOURCE_ERROR}) {
3529: return 0;
3530: }
3531:
3532: return scalar(@{$parts}); # + $delta;
3533: }
3534:
3535: sub multipart {
3536: my $self = shift;
3537: return $self->countParts() > 1;
3538: }
3539:
3540: sub singlepart {
3541: my $self = shift;
3542: return $self->countParts() == 1;
3543: }
3544:
3545: sub responseType {
3546: my $self = shift;
3547: my $part = shift;
3548:
3549: $self->extractParts();
3550: return $self->{RESPONSE_TYPES}->{$part};
3551: }
3552:
3553: sub responseIds {
3554: my $self = shift;
3555: my $part = shift;
3556:
3557: $self->extractParts();
3558: return $self->{RESPONSE_IDS}->{$part};
3559: }
3560:
3561: # Private function: Extracts the parts information, both part names and
3562: # part types, and saves it.
3563: sub extractParts {
3564: my $self = shift;
3565:
3566: return if (defined($self->{PARTS}));
3567: return if ($self->ext);
3568:
3569: $self->{PARTS} = [];
3570:
3571: my %parts;
3572:
3573: # Retrieve part count, if this is a problem
3574: if ($self->is_problem()) {
3575: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3576: if (!$metadata) {
3577: $self->{RESOURCE_ERROR} = 1;
3578: $self->{PARTS} = [];
3579: $self->{PART_TYPE} = {};
3580: return;
3581: }
3582: foreach (split(/\,/,$metadata)) {
3583: if ($_ =~ /^part_(.*)$/) {
3584: my $part = $1;
3585: # This floods the logs if it blows up
3586: if (defined($parts{$part})) {
3587: Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3588: }
3589:
3590: # check to see if part is turned off.
3591:
3592: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3593: $parts{$part} = 1;
3594: }
3595: }
3596: }
3597:
3598:
3599: my @sortedParts = sort keys %parts;
3600: $self->{PARTS} = \@sortedParts;
3601:
3602: my %responseIdHash;
3603: my %responseTypeHash;
3604:
3605:
3606: # Init the responseIdHash
3607: foreach (@{$self->{PARTS}}) {
3608: $responseIdHash{$_} = [];
3609: }
3610:
3611: # Now, the unfortunate thing about this is that parts, part name, and
3612: # response if are delimited by underscores, but both the part
3613: # name and response id can themselves have underscores in them.
3614: # So we have to use our knowlege of part names to figure out
3615: # where the part names begin and end, and even then, it is possible
3616: # to construct ambiguous situations.
3617: foreach (split /,/, $metadata) {
3618: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3619: my $responseType = $1;
3620: my $partStuff = $2;
3621: my $partIdSoFar = '';
3622: my @partChunks = split /_/, $partStuff;
3623: my $i = 0;
3624:
3625: for ($i = 0; $i < scalar(@partChunks); $i++) {
3626: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3627: $partIdSoFar .= $partChunks[$i];
3628: if ($parts{$partIdSoFar}) {
3629: my @otherChunks = @partChunks[$i+1..$#partChunks];
3630: my $responseId = join('_', @otherChunks);
3631: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3632: $responseTypeHash{$partIdSoFar} = $responseType;
3633: last;
3634: }
3635: }
3636: }
3637: }
3638:
3639: $self->{RESPONSE_IDS} = \%responseIdHash;
3640: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3641: }
3642:
3643: return;
3644: }
3645:
3646: =pod
3647:
3648: =head2 Resource Status
3649:
3650: Problem resources have status information, reflecting their various
3651: dates and completion statuses.
3652:
3653: There are two aspects to the status: the date-related information and
3654: the completion information.
3655:
3656: Idiomatic usage of these two methods would probably look something
3657: like
3658:
3659: foreach ($resource->parts()) {
3660: my $dateStatus = $resource->getDateStatus($_);
3661: my $completionStatus = $resource->getCompletionStatus($_);
3662:
3663: or
3664:
3665: my $status = $resource->status($_);
3666:
3667: ... use it here ...
3668: }
3669:
3670: Which you use depends on exactly what you are looking for. The
3671: status() function has been optimized for the nav maps display and may
3672: not precisely match what you need elsewhere.
3673:
3674: The symbolic constants shown below can be accessed through the
3675: resource object: C<$res->OPEN>.
3676:
3677: =over 4
3678:
3679: =item * B<getDateStatus>($part):
3680:
3681: ($part defaults to 0). A convenience function that returns a symbolic
3682: constant telling you about the date status of the part. The possible
3683: return values are:
3684:
3685: =back
3686:
3687: B<Date Codes>
3688:
3689: =over 4
3690:
3691: =item * B<OPEN_LATER>:
3692:
3693: The problem will be opened later.
3694:
3695: =item * B<OPEN>:
3696:
3697: Open and not yet due.
3698:
3699:
3700: =item * B<PAST_DUE_ANSWER_LATER>:
3701:
3702: The due date has passed, but the answer date has not yet arrived.
3703:
3704: =item * B<PAST_DUE_NO_ANSWER>:
3705:
3706: The due date has passed and there is no answer opening date set.
3707:
3708: =item * B<ANSWER_OPEN>:
3709:
3710: The answer date is here.
3711:
3712: =item * B<NETWORK_FAILURE>:
3713:
3714: The information is unknown due to network failure.
3715:
3716: =back
3717:
3718: =cut
3719:
3720: # Apparently the compiler optimizes these into constants automatically
3721: sub OPEN_LATER { return 0; }
3722: sub OPEN { return 1; }
3723: sub PAST_DUE_NO_ANSWER { return 2; }
3724: sub PAST_DUE_ANSWER_LATER { return 3; }
3725: sub ANSWER_OPEN { return 4; }
3726: sub NOTHING_SET { return 5; }
3727: sub NETWORK_FAILURE { return 100; }
3728:
3729: # getDateStatus gets the date status for a given problem part.
3730: # Because answer date, due date, and open date are fully independent
3731: # (i.e., it is perfectly possible to *only* have an answer date),
3732: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3733: # (past, future, none given). This function handles this with a decision
3734: # tree. Read the comments to follow the decision tree.
3735:
3736: sub getDateStatus {
3737: my $self = shift;
3738: my $part = shift;
3739: $part = "0" if (!defined($part));
3740:
3741: # Always return network failure if there was one.
3742: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3743:
3744: my $now = time();
3745:
3746: my $open = $self->opendate($part);
3747: my $due = $self->duedate($part);
3748: my $answer = $self->answerdate($part);
3749:
3750: if (!$open && !$due && !$answer) {
3751: # no data on the problem at all
3752: # should this be the same as "open later"? think multipart.
3753: return $self->NOTHING_SET;
3754: }
3755: if (!$open || $now < $open) {return $self->OPEN_LATER}
3756: if (!$due || $now < $due) {return $self->OPEN}
3757: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3758: if ($answer) { return $self->ANSWER_OPEN; }
3759: return PAST_DUE_NO_ANSWER;
3760: }
3761:
3762: =pod
3763:
3764: B<>
3765:
3766: =over 4
3767:
3768: =item * B<getCompletionStatus>($part):
3769:
3770: ($part defaults to 0.) A convenience function that returns a symbolic
3771: constant telling you about the completion status of the part, with the
3772: following possible results:
3773:
3774: =back
3775:
3776: B<Completion Codes>
3777:
3778: =over 4
3779:
3780: =item * B<NOT_ATTEMPTED>:
3781:
3782: Has not been attempted at all.
3783:
3784: =item * B<INCORRECT>:
3785:
3786: Attempted, but wrong by student.
3787:
3788: =item * B<INCORRECT_BY_OVERRIDE>:
3789:
3790: Attempted, but wrong by instructor override.
3791:
3792: =item * B<CORRECT>:
3793:
3794: Correct or correct by instructor.
3795:
3796: =item * B<CORRECT_BY_OVERRIDE>:
3797:
3798: Correct by instructor override.
3799:
3800: =item * B<EXCUSED>:
3801:
3802: Excused. Not yet implemented.
3803:
3804: =item * B<NETWORK_FAILURE>:
3805:
3806: Information not available due to network failure.
3807:
3808: =item * B<ATTEMPTED>:
3809:
3810: Attempted, and not yet graded.
3811:
3812: =back
3813:
3814: =cut
3815:
3816: sub NOT_ATTEMPTED { return 10; }
3817: sub INCORRECT { return 11; }
3818: sub INCORRECT_BY_OVERRIDE { return 12; }
3819: sub CORRECT { return 13; }
3820: sub CORRECT_BY_OVERRIDE { return 14; }
3821: sub EXCUSED { return 15; }
3822: sub ATTEMPTED { return 16; }
3823:
3824: sub getCompletionStatus {
3825: my $self = shift;
3826: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3827:
3828: my $status = $self->queryRestoreHash('solved', shift);
3829:
3830: # Left as seperate if statements in case we ever do more with this
3831: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3832: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3833: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3834: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3835: if ($status eq 'excused') {return $self->EXCUSED; }
3836: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3837: return $self->NOT_ATTEMPTED;
3838: }
3839:
3840: sub queryRestoreHash {
3841: my $self = shift;
3842: my $hashentry = shift;
3843: my $part = shift;
3844: $part = "0" if (!defined($part) || $part eq '');
3845: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3846:
3847: $self->getReturnHash();
3848:
3849: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3850: }
3851:
3852: =pod
3853:
3854: B<Composite Status>
3855:
3856: Along with directly returning the date or completion status, the
3857: resource object includes a convenience function B<status>() that will
3858: combine the two status tidbits into one composite status that can
3859: represent the status of the resource as a whole. This method represents
3860: the concept of the thing we want to display to the user on the nav maps
3861: screen, which is a combination of completion and open status. The precise logic is
3862: documented in the comments of the status method. The following results
3863: may be returned, all available as methods on the resource object
3864: ($res->NETWORK_FAILURE): In addition to the return values that match
3865: the date or completion status, this function can return "ANSWER_SUBMITTED"
3866: if that problemstatus parameter value is set to No, suppressing the
3867: incorrect/correct feedback.
3868:
3869: =over 4
3870:
3871: =item * B<NETWORK_FAILURE>:
3872:
3873: The network has failed and the information is not available.
3874:
3875: =item * B<NOTHING_SET>:
3876:
3877: No dates have been set for this problem (part) at all. (Because only
3878: certain parts of a multi-part problem may be assigned, this can not be
3879: collapsed into "open later", as we do not know a given part will EVER
3880: be opened. For single part, this is the same as "OPEN_LATER".)
3881:
3882: =item * B<CORRECT>:
3883:
3884: For any reason at all, the part is considered correct.
3885:
3886: =item * B<EXCUSED>:
3887:
3888: For any reason at all, the problem is excused.
3889:
3890: =item * B<PAST_DUE_NO_ANSWER>:
3891:
3892: The problem is past due, not considered correct, and no answer date is
3893: set.
3894:
3895: =item * B<PAST_DUE_ANSWER_LATER>:
3896:
3897: The problem is past due, not considered correct, and an answer date in
3898: the future is set.
3899:
3900: =item * B<ANSWER_OPEN>:
3901:
3902: The problem is past due, not correct, and the answer is now available.
3903:
3904: =item * B<OPEN_LATER>:
3905:
3906: The problem is not yet open.
3907:
3908: =item * B<TRIES_LEFT>:
3909:
3910: The problem is open, has been tried, is not correct, but there are
3911: tries left.
3912:
3913: =item * B<INCORRECT>:
3914:
3915: The problem is open, and all tries have been used without getting the
3916: correct answer.
3917:
3918: =item * B<OPEN>:
3919:
3920: The item is open and not yet tried.
3921:
3922: =item * B<ATTEMPTED>:
3923:
3924: The problem has been attempted.
3925:
3926: =item * B<ANSWER_SUBMITTED>:
3927:
3928: An answer has been submitted, but the student should not see it.
3929:
3930: =back
3931:
3932: =cut
3933:
3934: sub TRIES_LEFT { return 20; }
3935: sub ANSWER_SUBMITTED { return 21; }
3936:
3937: sub status {
3938: my $self = shift;
3939: my $part = shift;
3940: if (!defined($part)) { $part = "0"; }
3941: my $completionStatus = $self->getCompletionStatus($part);
3942: my $dateStatus = $self->getDateStatus($part);
3943:
3944: # What we have is a two-dimensional matrix with 4 entries on one
3945: # dimension and 5 entries on the other, which we want to colorize,
3946: # plus network failure and "no date data at all".
3947:
3948: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
3949: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3950:
3951: my $suppressFeedback = lc($self->parmval("problemstatus", $part)) eq 'no';
3952:
3953: # There are a few whole rows we can dispose of:
3954: if ($completionStatus == CORRECT ||
3955: $completionStatus == CORRECT_BY_OVERRIDE ) {
3956: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
3957: }
3958:
3959: if ($completionStatus == ATTEMPTED) {
3960: return ATTEMPTED;
3961: }
3962:
3963: # If it's EXCUSED, then return that no matter what
3964: if ($completionStatus == EXCUSED) {
3965: return EXCUSED;
3966: }
3967:
3968: if ($dateStatus == NOTHING_SET) {
3969: return NOTHING_SET;
3970: }
3971:
3972: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3973: # by 4 matrix (date statuses).
3974:
3975: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
3976: $dateStatus == PAST_DUE_NO_ANSWER ) {
3977: return $dateStatus;
3978: }
3979:
3980: if ($dateStatus == ANSWER_OPEN) {
3981: return ANSWER_OPEN;
3982: }
3983:
3984: # Now: (incorrect, incorrect_override, not_attempted) x
3985: # (open_later), (open)
3986:
3987: if ($dateStatus == OPEN_LATER) {
3988: return OPEN_LATER;
3989: }
3990:
3991: # If it's WRONG...
3992: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
3993: # and there are TRIES LEFT:
3994: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
3995: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
3996: }
3997: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
3998: }
3999:
4000: # Otherwise, it's untried and open
4001: return OPEN;
4002: }
4003:
4004: sub CLOSED { return 23; }
4005: sub ERROR { return 24; }
4006:
4007: =pod
4008:
4009: B<Simple Status>
4010:
4011: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4012: "Simple status" corresponds to "which icon is shown on the
4013: Navmaps". There are six "simple" statuses:
4014:
4015: =over 4
4016:
4017: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4018:
4019: =item * B<OPEN>: The problem is open and unattempted.
4020:
4021: =item * B<CORRECT>: The problem is correct for any reason.
4022:
4023: =item * B<INCORRECT>: The problem is incorrect and can still be
4024: completed successfully.
4025:
4026: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4027: does not know if they are correct. (The ellipsis icon.)
4028:
4029: =item * B<ERROR>: There is an error retrieving information about this
4030: problem.
4031:
4032: =back
4033:
4034: =cut
4035:
4036: # This hash maps the composite status to this simple status, and
4037: # can be used directly, if you like
4038: my %compositeToSimple =
4039: (
4040: NETWORK_FAILURE() => ERROR,
4041: NOTHING_SET() => CLOSED,
4042: CORRECT() => CORRECT,
4043: EXCUSED() => CORRECT,
4044: PAST_DUE_NO_ANSWER() => INCORRECT,
4045: PAST_DUE_ANSWER_LATER() => INCORRECT,
4046: ANSWER_OPEN() => INCORRECT,
4047: OPEN_LATER() => CLOSED,
4048: TRIES_LEFT() => OPEN,
4049: INCORRECT() => INCORRECT,
4050: OPEN() => OPEN,
4051: ATTEMPTED() => ATTEMPTED,
4052: ANSWER_SUBMITTED() => ATTEMPTED
4053: );
4054:
4055: sub simpleStatus {
4056: my $self = shift;
4057: my $part = shift;
4058: my $status = $self->status($part);
4059: return $compositeToSimple{$status};
4060: }
4061:
4062: =pod
4063:
4064: B<simpleStatusCount> will return an array reference containing, in
4065: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4066: and ERROR parts the given problem has.
4067:
4068: =cut
4069:
4070: # This maps the status to the slot we want to increment
4071: my %statusToSlotMap =
4072: (
4073: OPEN() => 0,
4074: CLOSED() => 1,
4075: CORRECT() => 2,
4076: INCORRECT() => 3,
4077: ATTEMPTED() => 4,
4078: ERROR() => 5
4079: );
4080:
4081: sub statusToSlot { return $statusToSlotMap{shift()}; }
4082:
4083: sub simpleStatusCount {
4084: my $self = shift;
4085:
4086: my @counts = (0, 0, 0, 0, 0, 0, 0);
4087: foreach my $part (@{$self->parts()}) {
4088: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4089: }
4090:
4091: return \@counts;
4092: }
4093:
4094: =pod
4095:
4096: B<Completable>
4097:
4098: The completable method represents the concept of I<whether the student can
4099: currently do the problem>. If the student can do the problem, which means
4100: that it is open, there are tries left, and if the problem is manually graded
4101: or the grade is suppressed via problemstatus, the student has not tried it
4102: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4103: either the student has tried it and there is no feedback, or that for
4104: some reason it is no longer completable (not open yet, successfully completed,
4105: out of tries, etc.). As an example, this is used as the filter for the
4106: "Uncompleted Homework" option for the nav maps.
4107:
4108: If this does not quite meet your needs, do not fiddle with it (unless you are
4109: fixing it to better match the student's conception of "completable" because
4110: it's broken somehow)... make a new method.
4111:
4112: =cut
4113:
4114: sub completable {
4115: my $self = shift;
4116: if (!$self->is_problem()) { return 0; }
4117: my $partCount = $self->countParts();
4118:
4119: foreach my $part (@{$self->parts()}) {
4120: if ($part eq '0' && $partCount != 1) { next; }
4121: my $status = $self->status($part);
4122: # "If any of the parts are open, or have tries left (implies open),
4123: # and it is not "attempted" (manually graded problem), it is
4124: # not "complete"
4125: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4126: $status == ANSWER_SUBMITTED() ) {
4127: # did this part already, as well as we can
4128: next;
4129: }
4130: if ($status == OPEN() || $status == TRIES_LEFT()) {
4131: return 1;
4132: }
4133: }
4134:
4135: # If all the parts were complete, so was this problem.
4136: return 0;
4137: }
4138:
4139: =pod
4140:
4141: =head2 Resource/Nav Map Navigation
4142:
4143: =over 4
4144:
4145: =item * B<getNext>():
4146:
4147: Retreive an array of the possible next resources after this
4148: one. Always returns an array, even in the one- or zero-element case.
4149:
4150: =item * B<getPrevious>():
4151:
4152: Retreive an array of the possible previous resources from this
4153: one. Always returns an array, even in the one- or zero-element case.
4154:
4155: =cut
4156:
4157: sub getNext {
4158: my $self = shift;
4159: my @branches;
4160: my $to = $self->to();
4161: foreach my $branch ( split(/,/, $to) ) {
4162: my $choice = $self->{NAV_MAP}->getById($branch);
4163: my $next = $choice->goesto();
4164: $next = $self->{NAV_MAP}->getById($next);
4165:
4166: push @branches, $next;
4167: }
4168: return \@branches;
4169: }
4170:
4171: sub getPrevious {
4172: my $self = shift;
4173: my @branches;
4174: my $from = $self->from();
4175: foreach my $branch ( split /,/, $from) {
4176: my $choice = $self->{NAV_MAP}->getById($branch);
4177: my $prev = $choice->comesfrom();
4178: $prev = $self->{NAV_MAP}->getById($prev);
4179:
4180: push @branches, $prev;
4181: }
4182: return \@branches;
4183: }
4184:
4185: sub browsePriv {
4186: my $self = shift;
4187: if (defined($self->{BROWSE_PRIV})) {
4188: return $self->{BROWSE_PRIV};
4189: }
4190:
4191: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4192: }
4193:
4194: =pod
4195:
4196: =back
4197:
4198: =cut
4199:
4200: 1;
4201:
4202: __END__
4203:
4204:
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