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[LON-CAPA] /
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lonnavmaps.pm
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Wed May 23 20:46:29 2007 UTC (16 years, 11 months ago) by
albertel
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- bug#5275, responses are handgradable, so when checking for handgrability check the responses, and pulll that value up to the part
1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.399 2007/05/23 20:46:29 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use GDBM_File;
34: use Apache::loncommon();
35: use Apache::lonenc();
36: use Apache::lonlocal;
37: use Apache::lonnet;
38: use POSIX qw (floor strftime);
39: use Data::Dumper; # for debugging, not always
40: use Time::HiRes qw( gettimeofday tv_interval );
41: use LONCAPA;
42:
43: # symbolic constants
44: sub SYMB { return 1; }
45: sub URL { return 2; }
46: sub NOTHING { return 3; }
47:
48: # Some data
49:
50: my $resObj = "Apache::lonnavmaps::resource";
51:
52: # Keep these mappings in sync with lonquickgrades, which uses the colors
53: # instead of the icons.
54: my %statusIconMap =
55: (
56: $resObj->CLOSED => '',
57: $resObj->OPEN => 'navmap.open.gif',
58: $resObj->CORRECT => 'navmap.correct.gif',
59: $resObj->PARTIALLY_CORRECT => 'navmap.partial.gif',
60: $resObj->INCORRECT => 'navmap.wrong.gif',
61: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
62: $resObj->ERROR => ''
63: );
64:
65: my %iconAltTags =
66: ( 'navmap.correct.gif' => 'Correct',
67: 'navmap.wrong.gif' => 'Incorrect',
68: 'navmap.open.gif' => 'Open' );
69:
70: # Defines a status->color mapping, null string means don't color
71: my %colormap =
72: ( $resObj->NETWORK_FAILURE => '',
73: $resObj->CORRECT => '',
74: $resObj->EXCUSED => '#3333FF',
75: $resObj->PAST_DUE_ANSWER_LATER => '',
76: $resObj->PAST_DUE_NO_ANSWER => '',
77: $resObj->ANSWER_OPEN => '#006600',
78: $resObj->OPEN_LATER => '',
79: $resObj->TRIES_LEFT => '',
80: $resObj->INCORRECT => '',
81: $resObj->OPEN => '',
82: $resObj->NOTHING_SET => '',
83: $resObj->ATTEMPTED => '',
84: $resObj->ANSWER_SUBMITTED => '',
85: $resObj->PARTIALLY_CORRECT => '#006600'
86: );
87: # And a special case in the nav map; what to do when the assignment
88: # is not yet done and due in less than 24 hours
89: my $hurryUpColor = "#FF0000";
90:
91: sub close {
92: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
93: return(<<ENDCLOSE);
94: <script type="text/javascript">
95: window.status='Accessing Nav Control';
96: menu=window.open("/adm/rat/empty.html","loncapanav",
97: "height=600,width=400,scrollbars=1");
98: window.status='Closing Nav Control';
99: menu.close();
100: window.status='Done.';
101: </script>
102: ENDCLOSE
103: }
104:
105: sub update {
106: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
107: if (!$env{'request.course.id'}) { return ''; }
108: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
109: return(<<ENDUPDATE);
110: <form name="navform"></form>
111: <script type="text/javascript">
112: this.document.navform.action='/adm/navmaps#curloc';
113: this.document.navform.target='loncapanav';
114: this.document.navform.submit();
115: </script>
116: ENDUPDATE
117: }
118:
119: # Convenience functions: Returns a string that adds or subtracts
120: # the second argument from the first hash, appropriate for the
121: # query string that determines which folders to recurse on
122: sub addToFilter {
123: my $hashIn = shift;
124: my $addition = shift;
125: my %hash = %$hashIn;
126: $hash{$addition} = 1;
127:
128: return join (",", keys(%hash));
129: }
130:
131: sub removeFromFilter {
132: my $hashIn = shift;
133: my $subtraction = shift;
134: my %hash = %$hashIn;
135:
136: delete $hash{$subtraction};
137: return join(",", keys(%hash));
138: }
139:
140: # Convenience function: Given a stack returned from getStack on the iterator,
141: # return the correct src() value.
142: sub getLinkForResource {
143: my $stack = shift;
144: my $res;
145:
146: # Check to see if there are any pages in the stack
147: foreach $res (@$stack) {
148: if (defined($res)) {
149: my $anchor;
150: if ($res->is_page()) {
151: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
152: $anchor=&escape($anchor->shown_symb());
153: return ($res->link(),$res->shown_symb(),$anchor);
154: }
155: # in case folder was skipped over as "only sequence"
156: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
157: if ($map=~/\.page$/) {
158: my $url=&Apache::lonnet::clutter($map);
159: $anchor=&escape($src->shown_symb());
160: return ($url,$res->shown_symb(),$anchor);
161: }
162: }
163: }
164:
165: # Failing that, return the src of the last resource that is defined
166: # (when we first recurse on a map, it puts an undefined resource
167: # on the bottom because $self->{HERE} isn't defined yet, and we
168: # want the src for the map anyhow)
169: foreach my $item (@$stack) {
170: if (defined($item)) { $res = $item; }
171: }
172:
173: return ($res->link(),$res->shown_symb());
174: }
175:
176: # Convenience function: This separates the logic of how to create
177: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
178: # etc.) into a separate function. It takes a resource object as the
179: # first parameter, and the part number of the resource as the second.
180: # It's basically a big switch statement on the status of the resource.
181:
182: sub getDescription {
183: my $res = shift;
184: my $part = shift;
185: my $status = $res->status($part);
186:
187: if ($status == $res->NETWORK_FAILURE) {
188: return &mt("Having technical difficulties; please check status later");
189: }
190: if ($status == $res->NOTHING_SET) {
191: return &mt("Not currently assigned.");
192: }
193: if ($status == $res->OPEN_LATER) {
194: return "Open " . timeToHumanString($res->opendate($part),'start');
195: }
196: if ($status == $res->OPEN) {
197: if ($res->duedate($part)) {
198: return &mt("Due")." " .timeToHumanString($res->duedate($part),'end');
199: } else {
200: return &mt("Open, no due date");
201: }
202: }
203: if ($status == $res->PAST_DUE_ANSWER_LATER) {
204: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part),'start');
205: }
206: if ($status == $res->PAST_DUE_NO_ANSWER) {
207: return &mt("Was due")." " . timeToHumanString($res->duedate($part),'end');
208: }
209: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
210: && $res->handgrade($part) ne 'yes') {
211: return &mt("Answer available");
212: }
213: if ($status == $res->EXCUSED) {
214: return &mt("Excused by instructor");
215: }
216: if ($status == $res->ATTEMPTED) {
217: return &mt("Answer submitted, not yet graded");
218: }
219: if ($status == $res->TRIES_LEFT) {
220: my $tries = $res->tries($part);
221: my $maxtries = $res->maxtries($part);
222: my $triesString = "";
223: if ($tries && $maxtries) {
224: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
225: if ($maxtries > 1 && $maxtries - $tries == 1) {
226: $triesString = "<b>$triesString</b>";
227: }
228: }
229: if ($res->duedate($part)) {
230: return &mt("Due")." " . timeToHumanString($res->duedate($part),'end') .
231: " $triesString";
232: } else {
233: return &mt("No due date")." $triesString";
234: }
235: }
236: if ($status == $res->ANSWER_SUBMITTED) {
237: return &mt('Answer submitted');
238: }
239: }
240:
241: # Convenience function, so others can use it: Is the problem due in less than
242: # 24 hours, and still can be done?
243:
244: sub dueInLessThan24Hours {
245: my $res = shift;
246: my $part = shift;
247: my $status = $res->status($part);
248:
249: return ($status == $res->OPEN() ||
250: $status == $res->TRIES_LEFT()) &&
251: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
252: $res->duedate($part) > time();
253: }
254:
255: # Convenience function, so others can use it: Is there only one try remaining for the
256: # part, with more than one try to begin with, not due yet and still can be done?
257: sub lastTry {
258: my $res = shift;
259: my $part = shift;
260:
261: my $tries = $res->tries($part);
262: my $maxtries = $res->maxtries($part);
263: return $tries && $maxtries && $maxtries > 1 &&
264: $maxtries - $tries == 1 && $res->duedate($part) &&
265: $res->duedate($part) > time();
266: }
267:
268: # This puts a human-readable name on the env variable.
269:
270: sub advancedUser {
271: return $env{'request.role.adv'};
272: }
273:
274:
275: # timeToHumanString takes a time number and converts it to a
276: # human-readable representation, meant to be used in the following
277: # manner:
278: # print "Due $timestring"
279: # print "Open $timestring"
280: # print "Answer available $timestring"
281: # Very, very, very, VERY English-only... goodness help a localizer on
282: # this func...
283:
284:
285: sub timeToHumanString {
286: my ($time,$type,$format) = @_;
287:
288: # zero, '0' and blank are bad times
289: if (!$time) {
290: return &mt('never');
291: }
292: unless (&Apache::lonlocal::current_language()=~/^en/) {
293: return &Apache::lonlocal::locallocaltime($time);
294: }
295: my $now = time();
296:
297: my @time = localtime($time);
298: my @now = localtime($now);
299:
300: # Positive = future
301: my $delta = $time - $now;
302:
303: my $minute = 60;
304: my $hour = 60 * $minute;
305: my $day = 24 * $hour;
306: my $week = 7 * $day;
307: my $inPast = 0;
308:
309: # Logic in comments:
310: # Is it now? (extremely unlikely)
311: if ( $delta == 0 ) {
312: return "this instant";
313: }
314:
315: if ($delta < 0) {
316: $inPast = 1;
317: $delta = -$delta;
318: }
319:
320: if ( $delta > 0 ) {
321:
322: my $tense = $inPast ? " ago" : "";
323: my $prefix = $inPast ? "" : "in ";
324:
325: # Less than a minute
326: if ( $delta < $minute ) {
327: if ($delta == 1) { return "${prefix}1 second$tense"; }
328: return "$prefix$delta seconds$tense";
329: }
330:
331: # Less than an hour
332: if ( $delta < $hour ) {
333: # If so, use minutes
334: my $minutes = floor($delta / 60);
335: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
336: return "$prefix$minutes minutes$tense";
337: }
338:
339: # Is it less than 24 hours away? If so,
340: # display hours + minutes
341: if ( $delta < $hour * 24) {
342: my $hours = floor($delta / $hour);
343: my $minutes = floor(($delta % $hour) / $minute);
344: my $hourString = "$hours hours";
345: my $minuteString = ", $minutes minutes";
346: if ($hours == 1) {
347: $hourString = "1 hour";
348: }
349: if ($minutes == 1) {
350: $minuteString = ", 1 minute";
351: }
352: if ($minutes == 0) {
353: $minuteString = "";
354: }
355: return "$prefix$hourString$minuteString$tense";
356: }
357:
358: # If there's a caller supplied format, use it.
359:
360: if($format ne '') {
361: my $timeStr = strftime($format, localtime($time));
362: return $timeStr.&Apache::lonlocal::gettimezone($time);
363: }
364:
365: # Less than 5 days away, display day of the week and
366: # HH:MM
367:
368: if ( $delta < $day * 5 ) {
369: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
370: $timeStr =~ s/12:00 am/00:00/;
371: $timeStr =~ s/12:00 pm/noon/;
372: return ($inPast ? "last " : "this ") .
373: $timeStr.&Apache::lonlocal::gettimezone($time);
374: }
375:
376: my $conjunction='on';
377: if ($type eq 'start') {
378: $conjunction='at';
379: } elsif ($type eq 'end') {
380: $conjunction='by';
381: }
382: # Is it this year?
383: if ( $time[5] == $now[5]) {
384: # Return on Month Day, HH:MM meridian
385: my $timeStr = strftime("$conjunction %A, %b %e at %I:%M %P", localtime($time));
386: $timeStr =~ s/12:00 am/00:00/;
387: $timeStr =~ s/12:00 pm/noon/;
388: return $timeStr.&Apache::lonlocal::gettimezone($time);
389: }
390:
391: # Not this year, so show the year
392: my $timeStr = strftime("$conjunction %A, %b %e %Y at %I:%M %P", localtime($time));
393: $timeStr =~ s/12:00 am/00:00/;
394: $timeStr =~ s/12:00 pm/noon/;
395: return $timeStr.&Apache::lonlocal::gettimezone($time);
396: }
397: }
398:
399:
400: =pod
401:
402: =head1 NAME
403:
404: Apache::lonnavmap - Subroutines to handle and render the navigation
405: maps
406:
407: =head1 SYNOPSIS
408:
409: The main handler generates the navigational listing for the course,
410: the other objects export this information in a usable fashion for
411: other modules.
412:
413: =head1 OVERVIEW
414:
415: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
416: course structure and caches it in what is often referred to as the
417: "big hash" X<big hash>. You can see it if you are logged into
418: LON-CAPA, in a course, by going to /adm/test. (You may need to
419: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
420: content of the hash will be under the heading "Big Hash".
421:
422: Big Hash contains, among other things, how resources are related
423: to each other (next/previous), what resources are maps, which
424: resources are being chosen to not show to the student (for random
425: selection), and a lot of other things that can take a lot of time
426: to compute due to the amount of data that needs to be collected and
427: processed.
428:
429: Apache::lonnavmaps provides an object model for manipulating this
430: information in a higher-level fashion than directly manipulating
431: the hash. It also provides access to several auxilary functions
432: that aren't necessarily stored in the Big Hash, but are a per-
433: resource sort of value, like whether there is any feedback on
434: a given resource.
435:
436: Apache::lonnavmaps also abstracts away branching, and someday,
437: conditions, for the times where you don't really care about those
438: things.
439:
440: Apache::lonnavmaps also provides fairly powerful routines for
441: rendering navmaps, and last but not least, provides the navmaps
442: view for when the user clicks the NAV button.
443:
444: B<Note>: Apache::lonnavmaps I<only> works for the "currently
445: logged in user"; if you want things like "due dates for another
446: student" lonnavmaps can not directly retrieve information like
447: that. You need the EXT function. This module can still help,
448: because many things, such as the course structure, are constant
449: between users, and Apache::lonnavmaps can help by providing
450: symbs for the EXT call.
451:
452: The rest of this file will cover the provided rendering routines,
453: which can often be used without fiddling with the navmap object at
454: all, then documents the Apache::lonnavmaps::navmap object, which
455: is the key to accessing the Big Hash information, covers the use
456: of the Iterator (which provides the logic for traversing the
457: somewhat-complicated Big Hash data structure), documents the
458: Apache::lonnavmaps::Resource objects that are returned by
459:
460: =head1 Subroutine: render
461:
462: The navmap renderer package provides a sophisticated rendering of the
463: standard navigation maps interface into HTML. The provided nav map
464: handler is actually just a glorified call to this.
465:
466: Because of the large number of parameters this function accepts,
467: instead of passing it arguments as is normal, pass it in an anonymous
468: hash with the desired options.
469:
470: The package provides a function called 'render', called as
471: Apache::lonnavmaps::render({}).
472:
473: =head2 Overview of Columns
474:
475: The renderer will build an HTML table for the navmap and return
476: it. The table consists of several columns, and a row for each
477: resource (or possibly each part). You tell the renderer how many
478: columns to create and what to place in each column, optionally using
479: one or more of the prepared columns, and the renderer will assemble
480: the table.
481:
482: Any additional generally useful column types should be placed in the
483: renderer code here, so anybody can use it anywhere else. Any code
484: specific to the current application (such as the addition of <input>
485: elements in a column) should be placed in the code of the thing using
486: the renderer.
487:
488: At the core of the renderer is the array reference COLS (see Example
489: section below for how to pass this correctly). The COLS array will
490: consist of entries of one of two types of things: Either an integer
491: representing one of the pre-packaged column types, or a sub reference
492: that takes a resource reference, a part number, and a reference to the
493: argument hash passed to the renderer, and returns a string that will
494: be inserted into the HTML representation as it.
495:
496: All other parameters are ways of either changing how the columns
497: are printing, or which rows are shown.
498:
499: The pre-packaged column names are refered to by constants in the
500: Apache::lonnavmaps namespace. The following currently exist:
501:
502: =over 4
503:
504: =item * B<Apache::lonnavmaps::resource>:
505:
506: The general info about the resource: Link, icon for the type, etc. The
507: first column in the standard nav map display. This column provides the
508: indentation effect seen in the B<NAV> screen. This column also accepts
509: the following parameters in the renderer hash:
510:
511: =over 4
512:
513: =item * B<resource_nolink>: default false
514:
515: If true, the resource will not be linked. By default, all non-folder
516: resources are linked.
517:
518: =item * B<resource_part_count>: default true
519:
520: If true, the resource will show a part count B<if> the full
521: part list is not displayed. (See "condense_parts" later.) If false,
522: the resource will never show a part count.
523:
524: =item * B<resource_no_folder_link>:
525:
526: If true, the resource's folder will not be clickable to open or close
527: it. Default is false. True implies printCloseAll is false, since you
528: can't close or open folders when this is on anyhow.
529:
530: =back
531:
532: =item * B<Apache::lonnavmaps::communication_status>:
533:
534: Whether there is discussion on the resource, email for the user, or
535: (lumped in here) perl errors in the execution of the problem. This is
536: the second column in the main nav map.
537:
538: =item * B<Apache::lonnavmaps::quick_status>:
539:
540: An icon for the status of a problem, with five possible states:
541: Correct, incorrect, open, awaiting grading (for a problem where the
542: computer's grade is suppressed, or the computer can't grade, like
543: essay problem), or none (not open yet, not a problem). The
544: third column of the standard navmap.
545:
546: =item * B<Apache::lonnavmaps::long_status>:
547:
548: A text readout of the details of the current status of the problem,
549: such as "Due in 22 hours". The fourth column of the standard navmap.
550:
551: =item * B<Apache::lonnavmaps::part_status_summary>:
552:
553: A text readout summarizing the status of the problem. If it is a
554: single part problem, will display "Correct", "Incorrect",
555: "Not yet open", "Open", "Attempted", or "Error". If there are
556: multiple parts, this will output a string that in HTML will show a
557: status of how many parts are in each status, in color coding, trying
558: to match the colors of the icons within reason.
559:
560: Note this only makes sense if you are I<not> showing parts. If
561: C<showParts> is true (see below), this column will not output
562: anything.
563:
564: =back
565:
566: If you add any others please be sure to document them here.
567:
568: An example of a column renderer that will show the ID number of a
569: resource, along with the part name if any:
570:
571: sub {
572: my ($resource, $part, $params) = @_;
573: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
574: return '<td>' . $resource->{ID} . '</td>';
575: }
576:
577: Note these functions are responsible for the TD tags, which allow them
578: to override vertical and horizontal alignment, etc.
579:
580: =head2 Parameters
581:
582: Minimally, you should be
583: able to get away with just using 'cols' (to specify the columns
584: shown), 'url' (necessary for the folders to link to the current screen
585: correctly), and possibly 'queryString' if your app calls for it. In
586: that case, maintaining the state of the folders will be done
587: automatically.
588:
589: =over 4
590:
591: =item * B<iterator>: default: constructs one from %env
592:
593: A reference to a fresh ::iterator to use from the navmaps. The
594: rendering will reflect the options passed to the iterator, so you can
595: use that to just render a certain part of the course, if you like. If
596: one is not passed, the renderer will attempt to construct one from
597: env{'form.filter'} and env{'form.condition'} information, plus the
598: 'iterator_map' parameter if any.
599:
600: =item * B<iterator_map>: default: not used
601:
602: If you are letting the renderer do the iterator handling, you can
603: instruct the renderer to render only a particular map by passing it
604: the source of the map you want to process, like
605: '/res/103/jerf/navmap.course.sequence'.
606:
607: =item * B<navmap>: default: constructs one from %env
608:
609: A reference to a navmap, used only if an iterator is not passed in. If
610: this is necessary to make an iterator but it is not passed in, a new
611: one will be constructed based on env info. This is useful to do basic
612: error checking before passing it off to render.
613:
614: =item * B<r>: default: must be passed in
615:
616: The standard Apache response object. This must be passed to the
617: renderer or the course hash will be locked.
618:
619: =item * B<cols>: default: empty (useless)
620:
621: An array reference
622:
623: =item * B<showParts>:default true
624:
625: A flag. If true, a line for the resource itself, and a line
626: for each part will be displayed. If not, only one line for each
627: resource will be displayed.
628:
629: =item * B<condenseParts>: default true
630:
631: A flag. If true, if all parts of the problem have the same
632: status and that status is Nothing Set, Correct, or Network Failure,
633: then only one line will be displayed for that resource anyhow. If no,
634: all parts will always be displayed. If showParts is 0, this is
635: ignored.
636:
637: =item * B<jumpCount>: default: determined from %env
638:
639: A string identifying the URL to place the anchor 'curloc' at.
640: It is the responsibility of the renderer user to
641: ensure that the #curloc is in the URL. By default, determined through
642: the use of the env{} 'jump' information, and should normally "just
643: work" correctly.
644:
645: =item * B<here>: default: empty string
646:
647: A Symb identifying where to place the 'here' marker. The empty
648: string means no marker.
649:
650: =item * B<indentString>: default: 25 pixel whitespace image
651:
652: A string identifying the indentation string to use.
653:
654: =item * B<queryString>: default: empty
655:
656: A string which will be prepended to the query string used when the
657: folders are opened or closed. You can use this to pass
658: application-specific values.
659:
660: =item * B<url>: default: none
661:
662: The url the folders will link to, which should be the current
663: page. Required if the resource info column is shown, and you
664: are allowing the user to open and close folders.
665:
666: =item * B<currentJumpIndex>: default: no jumping
667:
668: Describes the currently-open row number to cause the browser to jump
669: to, because the user just opened that folder. By default, pulled from
670: the Jump information in the env{'form.*'}.
671:
672: =item * B<printKey>: default: false
673:
674: If true, print the key that appears on the top of the standard
675: navmaps.
676:
677: =item * B<printCloseAll>: default: true
678:
679: If true, print the "Close all folders" or "open all folders"
680: links.
681:
682: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
683:
684: A function that takes the resource object as its only parameter and
685: returns a true or false value. If true, the resource is displayed. If
686: false, it is simply skipped in the display.
687:
688: =item * B<suppressEmptySequences>: default: false
689:
690: If you're using a filter function, and displaying sequences to orient
691: the user, then frequently some sequences will be empty. Setting this to
692: true will cause those sequences not to display, so as not to confuse the
693: user into thinking that if the sequence is there there should be things
694: under it; for example, see the "Show Uncompleted Homework" view on the
695: B<NAV> screen.
696:
697: =item * B<suppressNavmaps>: default: false
698:
699: If true, will not display Navigate Content resources.
700:
701: =back
702:
703: =head2 Additional Info
704:
705: In addition to the parameters you can pass to the renderer, which will
706: be passed through unchange to the column renderers, the renderer will
707: generate the following information which your renderer may find
708: useful:
709:
710: =over 4
711:
712: =item * B<counter>:
713:
714: Contains the number of rows printed. Useful after calling the render
715: function, as you can detect whether anything was printed at all.
716:
717: =item * B<isNewBranch>:
718:
719: Useful for renderers: If this resource is currently the first resource
720: of a new branch, this will be true. The Resource column (leftmost in the
721: navmaps screen) uses this to display the "new branch" icon
722:
723: =back
724:
725: =cut
726:
727: sub resource { return 0; }
728: sub communication_status { return 1; }
729: sub quick_status { return 2; }
730: sub long_status { return 3; }
731: sub part_status_summary { return 4; }
732:
733: sub render_resource {
734: my ($resource, $part, $params) = @_;
735:
736: my $nonLinkedText = ''; # stuff after resource title not in link
737:
738: my $link = $params->{"resourceLink"};
739:
740: # The URL part is not escaped at this point, but the symb is...
741: # The stuff to the left of the ? must have ' replaced by \' since
742: # it will be quoted with ' in the href.
743:
744: my ($left,$right) = split(/\?/, $link);
745: $link = $left.'?'.$right;
746:
747: my $src = $resource->src();
748: my $it = $params->{"iterator"};
749: my $filter = $it->{FILTER};
750:
751: my $title = $resource->compTitle();
752:
753: my $partLabel = "";
754: my $newBranchText = "";
755: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
756: # If this is a new branch, label it so
757: if ($params->{'isNewBranch'}) {
758: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
759: }
760:
761: # links to open and close the folder
762:
763:
764: my $linkopen = "<a href=\"$link\">";
765:
766:
767: my $linkclose = "</a>";
768:
769: # Default icon: unknown page
770: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
771:
772: if ($resource->is_problem()) {
773: if ($part eq '0' || $params->{'condensed'}) {
774: $icon = '<img src="'.$location.'/';
775: if ($resource->is_task()) {
776: $icon .= 'task.gif" alt="'.&mt('Task');
777: } else {
778: $icon .= 'problem.gif" alt="'.&mt('Problem');
779: }
780: $icon .='" border="0" />';
781: } else {
782: $icon = $params->{'indentString'};
783: }
784: } else {
785: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
786: }
787:
788: # Display the correct map icon to open or shut map
789: if ($resource->is_map()) {
790: my $mapId = $resource->map_pc();
791: my $nowOpen = !defined($filter->{$mapId});
792: if ($it->{CONDITION}) {
793: $nowOpen = !$nowOpen;
794: }
795:
796: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
797: my $title=$resource->title;
798: $title=~s/\"/\"/g;
799: if (!$params->{'resource_no_folder_link'}) {
800: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
801: $icon = "<img src='$location/$icon' alt=\"".
802: ($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" border='0' />";
803:
804: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
805: $params->{'queryString'} . '&filter=';
806: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
807: addToFilter($filter, $mapId) :
808: removeFromFilter($filter, $mapId);
809: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
810: . $params->{'hereType'} . '&here=' .
811: &escape($params->{'here'}) .
812: '&jump=' .
813: &escape($resource->symb()) .
814: "&folderManip=1\">";
815:
816: } else {
817: # Don't allow users to manipulate folder
818: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
819: '.nomanip.gif';
820: $icon = "<img src='$location/$icon' alt=\"".
821: ($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" border='0' />";
822:
823: $linkopen = "";
824: $linkclose = "";
825: }
826: }
827:
828: if ($resource->randomout()) {
829: $nonLinkedText .= ' <i>('.&mt('hidden').')</i> ';
830: }
831: if (!$resource->condval()) {
832: $nonLinkedText .= ' <i>('.&mt('conditionally hidden').')</i> ';
833: }
834:
835: # We're done preparing and finally ready to start the rendering
836: my $result = "<td align='left' valign='middle'>";
837:
838: my $indentLevel = $params->{'indentLevel'};
839: if ($newBranchText) { $indentLevel--; }
840:
841: # print indentation
842: for (my $i = 0; $i < $indentLevel; $i++) {
843: $result .= $params->{'indentString'};
844: }
845:
846: # Decide what to display
847:
848: $result .= "$newBranchText$linkopen$icon$linkclose";
849:
850: my $curMarkerBegin = '';
851: my $curMarkerEnd = '';
852:
853: # Is this the current resource?
854: if (!$params->{'displayedHereMarker'} &&
855: $resource->symb() eq $params->{'here'} ) {
856: $curMarkerBegin = '<font color="red" size="+2">></font>';
857: $curMarkerEnd = '<font color="red" size="+2"><</font>';
858: $params->{'displayedHereMarker'} = 1;
859: }
860:
861: if ($resource->is_problem() && $part ne '0' &&
862: !$params->{'condensed'}) {
863: my $displaypart=$resource->part_display($part);
864: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
865: if ($link!~/\#/) { $link.='#'.&escape($part); }
866: $title = "";
867: }
868:
869: if ($params->{'condensed'} && $resource->countParts() > 1) {
870: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
871: }
872:
873: my $target;
874: if ($env{'environment.remotenavmap'} eq 'on') {
875: $target=' target="loncapaclient" ';
876: }
877: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
878: $result .= " $curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
879: } else {
880: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
881: }
882:
883: return $result;
884: }
885:
886: sub render_communication_status {
887: my ($resource, $part, $params) = @_;
888: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
889:
890: my $link = $params->{"resourceLink"};
891: my $target;
892: if ($env{'environment.remotenavmap'} eq 'on') {
893: $target=' target="loncapaclient" ';
894: }
895: my $linkopen = "<a $target href=\"$link\">";
896: my $linkclose = "</a>";
897: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
898: if ($resource->hasDiscussion()) {
899: $discussionHTML = $linkopen .
900: '<img alt="'.&mt('New Discussion').'" border="0" src="'.$location.'/chat.gif" />' .
901: $linkclose;
902: }
903:
904: if ($resource->getFeedback()) {
905: my $feedback = $resource->getFeedback();
906: foreach my $msgid (split(/\,/, $feedback)) {
907: if ($msgid) {
908: $feedbackHTML .= ' <a '.$target.' href="/adm/email?display='
909: . &escape($msgid) . '">'
910: . '<img alt="'.&mt('New Email').'" src="'.$location.'/feedback.gif" '
911: . 'border="0" /></a>';
912: }
913: }
914: }
915:
916: if ($resource->getErrors()) {
917: my $errors = $resource->getErrors();
918: my $errorcount = 0;
919: foreach my $msgid (split(/,/, $errors)) {
920: last if ($errorcount>=10); # Only output 10 bombs maximum
921: if ($msgid) {
922: $errorcount++;
923: $errorHTML .= ' <a '.$target.' href="/adm/email?display='
924: . &escape($msgid) . '">'
925: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" '
926: . 'border="0" /></a>';
927: }
928: }
929: }
930:
931: if ($params->{'multipart'} && $part != '0') {
932: $discussionHTML = $feedbackHTML = $errorHTML = '';
933: }
934:
935: return "<td width=\"75\" align=\"left\" valign=\"middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
936:
937: }
938: sub render_quick_status {
939: my ($resource, $part, $params) = @_;
940: my $result = "";
941: my $firstDisplayed = !$params->{'condensed'} &&
942: $params->{'multipart'} && $part eq "0";
943:
944: my $link = $params->{"resourceLink"};
945: my $target;
946: if ($env{'environment.remotenavmap'} eq 'on') {
947: $target=' target="loncapaclient" ';
948: }
949: my $linkopen = "<a $target href=\"$link\">";
950: my $linkclose = "</a>";
951:
952: if ($resource->is_problem() &&
953: !$firstDisplayed) {
954:
955: my $icon = $statusIconMap{$resource->simpleStatus($part)};
956: my $alt = $iconAltTags{$icon};
957: if ($icon) {
958: my $location=
959: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
960: $result .= "<td valign='middle' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
961: } else {
962: $result .= "<td width='30'> </td>\n";
963: }
964: } else { # not problem, no icon
965: $result .= "<td width='30'> </td>\n";
966: }
967:
968: return $result;
969: }
970: sub render_long_status {
971: my ($resource, $part, $params) = @_;
972: my $result = "<td align='right' valign='middle'>\n";
973: my $firstDisplayed = !$params->{'condensed'} &&
974: $params->{'multipart'} && $part eq "0";
975:
976: my $color;
977: if ($resource->is_problem()) {
978: $color = $colormap{$resource->status};
979:
980: if (dueInLessThan24Hours($resource, $part) ||
981: lastTry($resource, $part)) {
982: $color = $hurryUpColor;
983: }
984: }
985:
986: if ($resource->kind() eq "res" &&
987: $resource->is_problem() &&
988: !$firstDisplayed) {
989: if ($color) {$result .= "<font color=\"$color\"><b>"; }
990: $result .= getDescription($resource, $part);
991: if ($color) {$result .= "</b></font>"; }
992: }
993: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
994: $result .= '(randomly select ' . $resource->randompick() .')';
995: }
996:
997: # Debugging code
998: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
999: # ' - Part: ' . $part;
1000:
1001: $result .= "</td>\n";
1002:
1003: return $result;
1004: }
1005:
1006: # Colors obtained by taking the icons, matching the colors, and
1007: # possibly reducing the Value (HSV) of the color, if it's too bright
1008: # for text, generally by one third or so.
1009: my %statusColors =
1010: (
1011: $resObj->CLOSED => '#000000',
1012: $resObj->OPEN => '#998b13',
1013: $resObj->CORRECT => '#26933f',
1014: $resObj->INCORRECT => '#c48207',
1015: $resObj->ATTEMPTED => '#a87510',
1016: $resObj->ERROR => '#000000'
1017: );
1018: my %statusStrings =
1019: (
1020: $resObj->CLOSED => 'Not yet open',
1021: $resObj->OPEN => 'Open',
1022: $resObj->CORRECT => 'Correct',
1023: $resObj->INCORRECT => 'Incorrect',
1024: $resObj->ATTEMPTED => 'Attempted',
1025: $resObj->ERROR => 'Network Error'
1026: );
1027: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1028:
1029: use Data::Dumper;
1030: sub render_parts_summary_status {
1031: my ($resource, $part, $params) = @_;
1032: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1033: if ($params->{showParts}) {
1034: return '<td></td>';
1035: }
1036:
1037: my $td = "<td align='right'>\n";
1038: my $endtd = "</td>\n";
1039: my @probs;
1040:
1041: if ($resource->contains_problem) {
1042: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1043: } else {
1044: @probs=($resource);
1045: }
1046: my $return;
1047: my %overallstatus;
1048: my $totalParts;
1049: foreach my $resource (@probs) {
1050: # If there is a single part, just show the simple status
1051: if ($resource->singlepart()) {
1052: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1053: $overallstatus{$status}++;
1054: $totalParts++;
1055: next;
1056: }
1057: # Now we can be sure the $part doesn't really matter.
1058: my $statusCount = $resource->simpleStatusCount();
1059: my @counts;
1060: foreach my $status (@statuses) {
1061: # decouple display order from the simpleStatusCount order
1062: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1063: if ($statusCount->[$slot]) {
1064: $overallstatus{$status}+=$statusCount->[$slot];
1065: $totalParts+=$statusCount->[$slot];
1066: }
1067: }
1068: }
1069: $return.= $td . $totalParts . ' parts: ';
1070: foreach my $status (@statuses) {
1071: if ($overallstatus{$status}) {
1072: $return.="<font color='" . $statusColors{$status} .
1073: "'>" . $overallstatus{$status} . ' '
1074: . $statusStrings{$status} . "</font>";
1075: }
1076: }
1077: $return.= $endtd;
1078: return $return;
1079: }
1080:
1081: my @preparedColumns = (\&render_resource, \&render_communication_status,
1082: \&render_quick_status, \&render_long_status,
1083: \&render_parts_summary_status);
1084:
1085: sub setDefault {
1086: my ($val, $default) = @_;
1087: if (!defined($val)) { return $default; }
1088: return $val;
1089: }
1090:
1091: sub cmp_title {
1092: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1093: $atitle=~s/^\s*//;
1094: $btitle=~s/^\s*//;
1095: return $atitle cmp $btitle;
1096: }
1097:
1098: sub render {
1099: my $args = shift;
1100: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1101: my $result = '';
1102: # Configure the renderer.
1103: my $cols = $args->{'cols'};
1104: if (!defined($cols)) {
1105: # no columns, no nav maps.
1106: return '';
1107: }
1108: my $navmap;
1109: if (defined($args->{'navmap'})) {
1110: $navmap = $args->{'navmap'};
1111: }
1112:
1113: my $r = $args->{'r'};
1114: my $queryString = $args->{'queryString'};
1115: my $jump = $args->{'jump'};
1116: my $here = $args->{'here'};
1117: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1118: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1119: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1120: # before the current resource when using #current
1121:
1122: # If we were passed 'here' information, we are not rendering
1123: # after a folder manipulation, and we were not passed an
1124: # iterator, make sure we open the folders to show the "here"
1125: # marker
1126: my $filterHash = {};
1127: # Figure out what we're not displaying
1128: foreach my $item (split(/\,/, $env{"form.filter"})) {
1129: if ($item) {
1130: $filterHash->{$item} = "1";
1131: }
1132: }
1133:
1134: # Filter: Remember filter function and add our own filter: Refuse
1135: # to show hidden resources unless the user can see them.
1136: my $userCanSeeHidden = advancedUser();
1137: my $filterFunc = setDefault($args->{'filterFunc'},
1138: sub {return 1;});
1139: if (!$userCanSeeHidden) {
1140: # Without renaming the filterfunc, the server seems to go into
1141: # an infinite loop
1142: my $oldFilterFunc = $filterFunc;
1143: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1144: &$oldFilterFunc($res);};
1145: }
1146:
1147: my $condition = 0;
1148: if ($env{'form.condition'}) {
1149: $condition = 1;
1150: }
1151:
1152: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1153: # Step 1: Check to see if we have a navmap
1154: if (!defined($navmap)) {
1155: $navmap = Apache::lonnavmaps::navmap->new();
1156: if (!defined($navmap)) {
1157: # no londer in course
1158: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1159: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1160: }
1161: }
1162:
1163: # Step two: Locate what kind of here marker is necessary
1164: # Determine where the "here" marker is and where the screen jumps to.
1165:
1166: if ($env{'form.postsymb'} ne '') {
1167: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1168: } elsif ($env{'form.postdata'} ne '') {
1169: # couldn't find a symb, is there a URL?
1170: my $currenturl = $env{'form.postdata'};
1171: #$currenturl=~s/^http\:\/\///;
1172: #$currenturl=~s/^[^\/]+//;
1173:
1174: $here = $jump = &Apache::lonnet::symbread($currenturl);
1175: }
1176: if ($here eq '') {
1177: my $last;
1178: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1179: &GDBM_READER(),0640)) {
1180: $last=$hash{'last_known'};
1181: untie(%hash);
1182: }
1183: if ($last) { $here = $jump = $last; }
1184: }
1185:
1186: # Step three: Ensure the folders are open
1187: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1188: my $curRes;
1189: my $found = 0;
1190:
1191: # We only need to do this if we need to open the maps to show the
1192: # current position. This will change the counter so we can't count
1193: # for the jump marker with this loop.
1194: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1195: if (ref($curRes) && $curRes->symb() eq $here) {
1196: my $mapStack = $mapIterator->getStack();
1197:
1198: # Ensure the parent maps are open
1199: for my $map (@{$mapStack}) {
1200: if ($condition) {
1201: undef $filterHash->{$map->map_pc()};
1202: } else {
1203: $filterHash->{$map->map_pc()} = 1;
1204: }
1205: }
1206: $found = 1;
1207: }
1208: }
1209: }
1210:
1211: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1212: # If this is a click on a folder or something, we want to preserve the "here"
1213: # from the querystring, and get the new "jump" marker
1214: $here = $env{'form.here'};
1215: $jump = $env{'form.jump'};
1216: }
1217:
1218: my $it = $args->{'iterator'};
1219: if (!defined($it)) {
1220: # Construct a default iterator based on $env{'form.'} information
1221:
1222: # Step 1: Check to see if we have a navmap
1223: if (!defined($navmap)) {
1224: $navmap = Apache::lonnavmaps::navmap->new();
1225: }
1226:
1227: # See if we're being passed a specific map
1228: if ($args->{'iterator_map'}) {
1229: my $map = $args->{'iterator_map'};
1230: $map = $navmap->getResourceByUrl($map);
1231: my $firstResource = $map->map_start();
1232: my $finishResource = $map->map_finish();
1233:
1234: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1235: } else {
1236: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1237: }
1238: }
1239:
1240: # (re-)Locate the jump point, if any
1241: # Note this does not take filtering or hidden into account... need
1242: # to be fixed?
1243: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1244: my $curRes;
1245: my $foundJump = 0;
1246: my $counter = 0;
1247:
1248: while (($curRes = $mapIterator->next()) && !$foundJump) {
1249: if (ref($curRes)) { $counter++; }
1250:
1251: if (ref($curRes) && $jump eq $curRes->symb()) {
1252:
1253: # This is why we have to use the main iterator instead of the
1254: # potentially faster DFS: The count has to be the same, so
1255: # the order has to be the same, which DFS won't give us.
1256: $args->{'currentJumpIndex'} = $counter;
1257: $foundJump = 1;
1258: }
1259: }
1260:
1261: my $showParts = setDefault($args->{'showParts'}, 1);
1262: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1263: # keeps track of when the current resource is found,
1264: # so we can back up a few and put the anchor above the
1265: # current resource
1266: my $printKey = $args->{'printKey'};
1267: my $printCloseAll = $args->{'printCloseAll'};
1268: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1269:
1270: # Print key?
1271: if ($printKey) {
1272: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1273: my $date=localtime;
1274: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1275: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1276: if ($navmap->{LAST_CHECK}) {
1277: $result .=
1278: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1279: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1280: '</td><td align="center" valign="bottom"> '.
1281: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1282: '</td>';
1283: } else {
1284: $result .= '<td align="center" valign="bottom"> '.
1285: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1286: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1287: '</td>';
1288: }
1289:
1290: $result .= '</tr></table>';
1291: }
1292:
1293: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1294: my ($link,$text);
1295: if ($condition) {
1296: $link='"navmaps?condition=0&filter=&'.$queryString.
1297: '&here='.&escape($here).'"';
1298: $text='Close all folders';
1299: } else {
1300: $link='"navmaps?condition=1&filter=&'.$queryString.
1301: '&here='.&escape($here).'"';
1302: $text='Open all folders';
1303: }
1304: if ($args->{'caller'} eq 'navmapsdisplay') {
1305: &add_linkitem($args->{'linkitems'},'changefolder',
1306: 'location.href='.$link,$text);
1307: } else {
1308: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1309: }
1310: $result .= "\n";
1311: }
1312:
1313: # Check for any unread discussions in all resources.
1314: if ($args->{'caller'} eq 'navmapsdisplay') {
1315: &add_linkitem($args->{'linkitems'},'clearbubbles',
1316: 'document.clearbubbles.submit()',
1317: 'Mark all posts read');
1318: my $time=time;
1319: $result .= (<<END);
1320: <form name="clearbubbles" method="post" action="/adm/feedback">
1321: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1322: <input type="hidden" name="navtime" value="$time" />
1323: END
1324: if ($args->{'sort'} eq 'discussion') {
1325: my $totdisc = 0;
1326: my $haveDisc = '';
1327: my @allres=$navmap->retrieveResources();
1328: foreach my $resource (@allres) {
1329: if ($resource->hasDiscussion()) {
1330: $haveDisc .= $resource->wrap_symb().':';
1331: $totdisc ++;
1332: }
1333: }
1334: if ($totdisc > 0) {
1335: $haveDisc =~ s/:$//;
1336: $result .= (<<END);
1337: <input type="hidden" name="navmaps" value="$haveDisc" />
1338: </form>
1339: END
1340: }
1341: }
1342: $result.='</form>';
1343: }
1344:
1345: if ($args->{'caller'} eq 'navmapsdisplay') {
1346: $result .= '<table><tr><td>'.
1347: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1348: if ($env{'environment.remotenavmap'} ne 'on') {
1349: $result .= '<td> </td>';
1350: } else {
1351: $result .= '</tr><tr>';
1352: }
1353: $result.=&show_linkitems($args->{'linkitems'});
1354: if ($args->{'sort_html'}) {
1355: if ($env{'environment.remotenavmap'} ne 'on') {
1356: $result.='<td> </td><td> </td><td> </td>'.
1357: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1358: } else {
1359: $result.='</tr><tr><td align="left"><br />'.
1360: $args->{'sort_html'}.'</td></tr>';
1361: }
1362: }
1363: $result .= '</table>';
1364: } elsif ($args->{'sort_html'}) {
1365: $result.=$args->{'sort_html'};
1366: }
1367:
1368: $result .= "<br />\n";
1369: if ($r) {
1370: $r->print($result);
1371: $r->rflush();
1372: $result = "";
1373: }
1374: # End parameter setting
1375:
1376: # Data
1377: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1378: my $res = "Apache::lonnavmaps::resource";
1379: my %condenseStatuses =
1380: ( $res->NETWORK_FAILURE => 1,
1381: $res->NOTHING_SET => 1,
1382: $res->CORRECT => 1 );
1383: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1384:
1385: # Shared variables
1386: $args->{'counter'} = 0; # counts the rows
1387: $args->{'indentLevel'} = 0;
1388: $args->{'isNewBranch'} = 0;
1389: $args->{'condensed'} = 0;
1390: my $location=
1391: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1392: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1393: $args->{'displayedHereMarker'} = 0;
1394:
1395: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1396: # since structure actually doesn't matter, except what map has what resources.
1397: if ($args->{'suppressEmptySequences'}) {
1398: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1399: $it->{FIRST_RESOURCE},
1400: $it->{FINISH_RESOURCE},
1401: {}, undef, 1);
1402: my $depth = 0;
1403: $dfsit->next();
1404: my $curRes = $dfsit->next();
1405: while ($depth > -1) {
1406: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1407: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1408:
1409: if (ref($curRes)) {
1410: # Parallel pre-processing: Do sequences have non-filtered-out children?
1411: if ($curRes->is_map()) {
1412: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1413: # Sequences themselves do not count as visible children,
1414: # unless those sequences also have visible children.
1415: # This means if a sequence appears, there's a "promise"
1416: # that there's something under it if you open it, somewhere.
1417: } else {
1418: # Not a sequence: if it's filtered, ignore it, otherwise
1419: # rise up the stack and mark the sequences as having children
1420: if (&$filterFunc($curRes)) {
1421: for my $sequence (@{$dfsit->getStack()}) {
1422: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1423: }
1424: }
1425: }
1426: }
1427: } continue {
1428: $curRes = $dfsit->next();
1429: }
1430: }
1431:
1432: my $displayedJumpMarker = 0;
1433: # Set up iteration.
1434: my $now = time();
1435: my $in24Hours = $now + 24 * 60 * 60;
1436: my $rownum = 0;
1437:
1438: # export "here" marker information
1439: $args->{'here'} = $here;
1440:
1441: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1442: my @resources;
1443: my $code='';# sub { !(shift->is_map();) };
1444: if ($args->{'sort'} eq 'title') {
1445: my $oldFilterFunc = $filterFunc;
1446: my $filterFunc=
1447: sub {
1448: my ($res)=@_;
1449: if ($res->is_map()) { return 0;}
1450: return &$oldFilterFunc($res);
1451: };
1452: @resources=$navmap->retrieveResources(undef,$filterFunc);
1453: @resources= sort { &cmp_title($a,$b) } @resources;
1454: } elsif ($args->{'sort'} eq 'duedate') {
1455: my $oldFilterFunc = $filterFunc;
1456: my $filterFunc=
1457: sub {
1458: my ($res)=@_;
1459: if (!$res->is_problem()) { return 0;}
1460: return &$oldFilterFunc($res);
1461: };
1462: @resources=$navmap->retrieveResources(undef,$filterFunc);
1463: @resources= sort {
1464: if ($a->duedate ne $b->duedate) {
1465: return $a->duedate cmp $b->duedate;
1466: }
1467: my $value=&cmp_title($a,$b);
1468: return $value;
1469: } @resources;
1470: } elsif ($args->{'sort'} eq 'discussion') {
1471: my $oldFilterFunc = $filterFunc;
1472: my $filterFunc=
1473: sub {
1474: my ($res)=@_;
1475: if (!$res->hasDiscussion() &&
1476: !$res->getFeedback() &&
1477: !$res->getErrors()) { return 0;}
1478: return &$oldFilterFunc($res);
1479: };
1480: @resources=$navmap->retrieveResources(undef,$filterFunc);
1481: @resources= sort { &cmp_title($a,$b) } @resources;
1482: } else {
1483: #unknow sort mechanism or default
1484: undef($args->{'sort'});
1485: }
1486:
1487:
1488: while (1) {
1489: if ($args->{'sort'}) {
1490: $curRes = shift(@resources);
1491: } else {
1492: $curRes = $it->next($closeAllPages);
1493: }
1494: if (!$curRes) { last; }
1495:
1496: # Maintain indentation level.
1497: if ($curRes == $it->BEGIN_MAP() ||
1498: $curRes == $it->BEGIN_BRANCH() ) {
1499: $args->{'indentLevel'}++;
1500: }
1501: if ($curRes == $it->END_MAP() ||
1502: $curRes == $it->END_BRANCH() ) {
1503: $args->{'indentLevel'}--;
1504: }
1505: # Notice new branches
1506: if ($curRes == $it->BEGIN_BRANCH()) {
1507: $args->{'isNewBranch'} = 1;
1508: }
1509:
1510: # If this isn't an actual resource, continue on
1511: if (!ref($curRes)) {
1512: next;
1513: }
1514:
1515: # If this has been filtered out, continue on
1516: if (!(&$filterFunc($curRes))) {
1517: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1518: next;
1519: }
1520:
1521: # If this is an empty sequence and we're filtering them, continue on
1522: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1523: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1524: next;
1525: }
1526:
1527: # If we're suppressing navmaps and this is a navmap, continue on
1528: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1529: next;
1530: }
1531:
1532: $args->{'counter'}++;
1533:
1534: # Does it have multiple parts?
1535: $args->{'multipart'} = 0;
1536: $args->{'condensed'} = 0;
1537: my @parts;
1538:
1539: # Decide what parts to show.
1540: if ($curRes->is_problem() && $showParts) {
1541: @parts = @{$curRes->parts()};
1542: $args->{'multipart'} = $curRes->multipart();
1543:
1544: if ($condenseParts) { # do the condensation
1545: if (!$args->{'condensed'}) {
1546: # Decide whether to condense based on similarity
1547: my $status = $curRes->status($parts[0]);
1548: my $due = $curRes->duedate($parts[0]);
1549: my $open = $curRes->opendate($parts[0]);
1550: my $statusAllSame = 1;
1551: my $dueAllSame = 1;
1552: my $openAllSame = 1;
1553: for (my $i = 1; $i < scalar(@parts); $i++) {
1554: if ($curRes->status($parts[$i]) != $status){
1555: $statusAllSame = 0;
1556: }
1557: if ($curRes->duedate($parts[$i]) != $due ) {
1558: $dueAllSame = 0;
1559: }
1560: if ($curRes->opendate($parts[$i]) != $open) {
1561: $openAllSame = 0;
1562: }
1563: }
1564: # $*allSame is true if all the statuses were
1565: # the same. Now, if they are all the same and
1566: # match one of the statuses to condense, or they
1567: # are all open with the same due date, or they are
1568: # all OPEN_LATER with the same open date, display the
1569: # status of the first non-zero part (to get the 'correct'
1570: # status right, since 0 is never 'correct' or 'open').
1571: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1572: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1573: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1574: @parts = ($parts[0]);
1575: $args->{'condensed'} = 1;
1576: }
1577: }
1578: # Multipart problem with one part: always "condense" (happens
1579: # to match the desirable behavior)
1580: if ($curRes->countParts() == 1) {
1581: @parts = ($parts[0]);
1582: $args->{'condensed'} = 1;
1583: }
1584: }
1585: }
1586:
1587: # If the multipart problem was condensed, "forget" it was multipart
1588: if (scalar(@parts) == 1) {
1589: $args->{'multipart'} = 0;
1590: } else {
1591: # Add part 0 so we display it correctly.
1592: unshift @parts, '0';
1593: }
1594:
1595: {
1596: my ($src,$symb,$anchor,$stack);
1597: if ($args->{'sort'}) {
1598: my $it = $navmap->getIterator(undef, undef, undef, 1);
1599: while ( my $res=$it->next()) {
1600: if (ref($res) &&
1601: $res->symb() eq $curRes->symb()) { last; }
1602: }
1603: $stack=$it->getStack();
1604: } else {
1605: $stack=$it->getStack();
1606: }
1607: ($src,$symb,$anchor)=getLinkForResource($stack);
1608: if (defined($anchor)) { $anchor='#'.$anchor; }
1609: my $srcHasQuestion = $src =~ /\?/;
1610: $args->{"resourceLink"} = $src.
1611: ($srcHasQuestion?'&':'?') .
1612: 'symb=' . &escape($symb).$anchor;
1613: }
1614: # Now, we've decided what parts to show. Loop through them and
1615: # show them.
1616: foreach my $part (@parts) {
1617: $rownum ++;
1618: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1619:
1620: $result .= " <tr bgcolor='$backgroundColor'>\n";
1621:
1622: # Set up some data about the parts that the cols might want
1623: my $filter = $it->{FILTER};
1624:
1625: # Now, display each column.
1626: foreach my $col (@$cols) {
1627: my $colHTML = '';
1628: if (ref($col)) {
1629: $colHTML .= &$col($curRes, $part, $args);
1630: } else {
1631: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1632: }
1633:
1634: # If this is the first column and it's time to print
1635: # the anchor, do so
1636: if ($col == $cols->[0] &&
1637: $args->{'counter'} == $args->{'currentJumpIndex'} -
1638: $currentJumpDelta) {
1639: # Jam the anchor after the <td> tag;
1640: # necessary for valid HTML (which Mozilla requires)
1641: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1642: $displayedJumpMarker = 1;
1643: }
1644: $result .= $colHTML . "\n";
1645: }
1646: $result .= " </tr>\n";
1647: $args->{'isNewBranch'} = 0;
1648: }
1649:
1650: if ($r && $rownum % 20 == 0) {
1651: $r->print($result);
1652: $result = "";
1653: $r->rflush();
1654: }
1655: } continue {
1656: if ($r) {
1657: # If we have the connection, make sure the user is still connected
1658: my $c = $r->connection;
1659: if ($c->aborted()) {
1660: # Who cares what we do, nobody will see it anyhow.
1661: return '';
1662: }
1663: }
1664: }
1665:
1666: # Print out the part that jumps to #curloc if it exists
1667: # delay needed because the browser is processing the jump before
1668: # it finishes rendering, so it goes to the wrong place!
1669: # onload might be better, but this routine has no access to that.
1670: # On mozilla, the 0-millisecond timeout seems to prevent this;
1671: # it's quite likely this might fix other browsers, too, and
1672: # certainly won't hurt anything.
1673: if ($displayedJumpMarker) {
1674: $result .= "
1675: <script>
1676: if (location.href.indexOf('#curloc')==-1) {
1677: setTimeout(\"location += '#curloc';\", 0)
1678: }
1679: </script>";
1680: }
1681:
1682: $result .= "</table>";
1683:
1684: if ($r) {
1685: $r->print($result);
1686: $result = "";
1687: $r->rflush();
1688: }
1689:
1690: return $result;
1691: }
1692:
1693: sub add_linkitem {
1694: my ($linkitems,$name,$cmd,$text)=@_;
1695: $$linkitems{$name}{'cmd'}=$cmd;
1696: $$linkitems{$name}{'text'}=&mt($text);
1697: }
1698:
1699: sub show_linkitems {
1700: my ($linkitems)=@_;
1701: my @linkorder = ("blank","launchnav","closenav","firsthomework",
1702: "everything","uncompleted","changefolder","clearbubbles");
1703:
1704: my $result .= (<<ENDBLOCK);
1705: <td align="left">
1706: <script type="text/javascript">
1707: function changeNavDisplay () {
1708: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1709: ENDBLOCK
1710: foreach my $link (@linkorder) {
1711: $result.= "if (navchoice == '$link') {".
1712: $linkitems->{$link}{'cmd'}."}\n";
1713: }
1714: $result.='}
1715: </script>
1716: <form name="linkitems" method="post">
1717: <nobr><select name="toplink">'."\n";
1718: foreach my $link (@linkorder) {
1719: if (defined($linkitems->{$link})) {
1720: if ($linkitems->{$link}{'text'} ne '') {
1721: $result .= ' <option value="'.$link.'">'.
1722: $linkitems->{$link}{'text'}."</option>\n";
1723: }
1724: }
1725: }
1726: $result .= '</select> <input type="button" name="chgnav"
1727: value="Go" onClick="javascript:changeNavDisplay()" />
1728: </nobr></form></td>'."\n";
1729:
1730: return $result;
1731: }
1732:
1733: 1;
1734:
1735: package Apache::lonnavmaps::navmap;
1736:
1737: =pod
1738:
1739: =head1 Object: Apache::lonnavmaps::navmap
1740:
1741: =head2 Overview
1742:
1743: The navmap object's job is to provide access to the resources
1744: in the course as Apache::lonnavmaps::resource objects, and to
1745: query and manage the relationship between those resource objects.
1746:
1747: Generally, you'll use the navmap object in one of three basic ways.
1748: In order of increasing complexity and power:
1749:
1750: =over 4
1751:
1752: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1753: various ways to obtain resource objects, based on various identifiers.
1754: Use this when you want to request information about one object or
1755: a handful of resources you already know the identities of, from some
1756: other source. For more about Ids, Symbs, and MapPcs, see the
1757: Resource documentation. Note that Url should be a B<last resort>,
1758: not your first choice; it only really works when there is only one
1759: instance of the resource in the course, which only applies to
1760: maps, and even that may change in the future (see the B<getResourceByUrl>
1761: documentation for more details.)
1762:
1763: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1764: retrieves resources matching some criterion and returns them
1765: in a flat array, with no structure information. Use this when
1766: you are manipulating a series of resources, based on what map
1767: the are in, but do not care about branching, or exactly how
1768: the maps and resources are related. This is the most common case.
1769:
1770: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1771: the course's navmap in various ways without writing the traversal
1772: code yourself. See iterator documentation below. Use this when
1773: you need to know absolutely everything about the course, including
1774: branches and the precise relationship between maps and resources.
1775:
1776: =back
1777:
1778: =head2 Creation And Destruction
1779:
1780: To create a navmap object, use the following function:
1781:
1782: =over 4
1783:
1784: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1785:
1786: Creates a new navmap object. Returns the navmap object if this is
1787: successful, or B<undef> if not.
1788:
1789: =back
1790:
1791: =head2 Methods
1792:
1793: =over 4
1794:
1795: =item * B<getIterator>(first, finish, filter, condition):
1796:
1797: See iterator documentation below.
1798:
1799: =cut
1800:
1801: use strict;
1802: use GDBM_File;
1803: use Apache::lonnet;
1804: use LONCAPA;
1805:
1806: sub new {
1807: # magic invocation to create a class instance
1808: my $proto = shift;
1809: my $class = ref($proto) || $proto;
1810: my $self = {};
1811:
1812: # Resource cache stores navmap resources as we reference them. We generate
1813: # them on-demand so we don't pay for creating resources unless we use them.
1814: $self->{RESOURCE_CACHE} = {};
1815:
1816: # Network failure flag, if we accessed the course or user opt and
1817: # failed
1818: $self->{NETWORK_FAILURE} = 0;
1819:
1820: # tie the nav hash
1821:
1822: my %navmaphash;
1823: my %parmhash;
1824: my $courseFn = $env{"request.course.fn"};
1825: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1826: &GDBM_READER(), 0640))) {
1827: return undef;
1828: }
1829:
1830: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1831: &GDBM_READER(), 0640)))
1832: {
1833: untie %{$self->{PARM_HASH}};
1834: return undef;
1835: }
1836:
1837: $self->{NAV_HASH} = \%navmaphash;
1838: $self->{PARM_HASH} = \%parmhash;
1839: $self->{PARM_CACHE} = {};
1840:
1841: bless($self);
1842:
1843: return $self;
1844: }
1845:
1846: sub generate_course_user_opt {
1847: my $self = shift;
1848: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1849:
1850: my $uname=$env{'user.name'};
1851: my $udom=$env{'user.domain'};
1852: my $cid=$env{'request.course.id'};
1853: my $cdom=$env{'course.'.$cid.'.domain'};
1854: my $cnum=$env{'course.'.$cid.'.num'};
1855:
1856: # ------------------------------------------------- Get coursedata (if present)
1857: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
1858: # Check for network failure
1859: if (!ref($courseopt)) {
1860: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
1861: $self->{NETWORK_FAILURE} = 1;
1862: }
1863: undef($courseopt);
1864: }
1865:
1866: # --------------------------------------------------- Get userdata (if present)
1867:
1868: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
1869: # Check for network failure
1870: if (!ref($useropt)) {
1871: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
1872: $self->{NETWORK_FAILURE} = 1;
1873: }
1874: undef($useropt);
1875: }
1876:
1877: $self->{COURSE_OPT} = $courseopt;
1878: $self->{USER_OPT} = $useropt;
1879:
1880: $self->{COURSE_USER_OPT_GENERATED} = 1;
1881:
1882: return;
1883: }
1884:
1885: sub generate_email_discuss_status {
1886: my $self = shift;
1887: my $symb = shift;
1888: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1889:
1890: my $cid=$env{'request.course.id'};
1891: my $cdom=$env{'course.'.$cid.'.domain'};
1892: my $cnum=$env{'course.'.$cid.'.num'};
1893:
1894: my %emailstatus = &Apache::lonnet::dump('email_status');
1895: my $logoutTime = $emailstatus{'logout'};
1896: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
1897: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1898: $courseLeaveTime : $logoutTime);
1899: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1900: $cdom, $cnum);
1901: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1902: $env{'user.domain'},$env{'user.name'},'lastread');
1903: my %lastreadtime = ();
1904: foreach my $key (keys %lastread) {
1905: my $shortkey = $key;
1906: $shortkey =~ s/_lastread$//;
1907: $lastreadtime{$shortkey} = $lastread{$key};
1908: }
1909:
1910: my %feedback=();
1911: my %error=();
1912: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
1913: $env{'user.name'});
1914:
1915: foreach my $msgid (@keys) {
1916: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
1917: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
1918: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
1919: &Apache::lonenc::check_decrypt(\$symb);
1920: if (($fromcid ne '') && ($fromcid ne $cid)) {
1921: next;
1922: }
1923: if (defined($symb)) {
1924: if (defined($error) && $error == 1) {
1925: $error{$symb}.=','.$msgid;
1926: } else {
1927: $feedback{$symb}.=','.$msgid;
1928: }
1929: } else {
1930: my $plain=
1931: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
1932: if ($plain=~/ \[([^\]]+)\]\:/) {
1933: my $url=$1;
1934: if ($plain=~/\:Error \[/) {
1935: $error{$url}.=','.$msgid;
1936: } else {
1937: $feedback{$url}.=','.$msgid;
1938: }
1939: }
1940: }
1941: }
1942: }
1943:
1944: #symbs of resources that have feedbacks (will be urls pre-2.3)
1945: $self->{FEEDBACK} = \%feedback;
1946: #or errors (will be urls pre 2.3)
1947: $self->{ERROR_MSG} = \%error;
1948: $self->{DISCUSSION_TIME} = \%discussiontime;
1949: $self->{EMAIL_STATUS} = \%emailstatus;
1950: $self->{LAST_READ} = \%lastreadtime;
1951:
1952: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1953: }
1954:
1955: sub get_user_data {
1956: my $self = shift;
1957: if ($self->{RETRIEVED_USER_DATA}) { return; }
1958:
1959: # Retrieve performance data on problems
1960: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
1961: $env{'user.domain'},
1962: $env{'user.name'});
1963: $self->{STUDENT_DATA} = \%student_data;
1964:
1965: $self->{RETRIEVED_USER_DATA} = 1;
1966: }
1967:
1968: sub get_discussion_data {
1969: my $self = shift;
1970: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
1971: return $self->{DISCUSSION_DATA};
1972: }
1973:
1974: $self->generate_email_discuss_status();
1975:
1976: my $cid=$env{'request.course.id'};
1977: my $cdom=$env{'course.'.$cid.'.domain'};
1978: my $cnum=$env{'course.'.$cid.'.num'};
1979: # Retrieve discussion data for resources in course
1980: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
1981:
1982:
1983: $self->{DISCUSSION_DATA} = \%discussion_data;
1984: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
1985: return $self->{DISCUSSION_DATA};
1986: }
1987:
1988:
1989: # Internal function: Takes a key to look up in the nav hash and implements internal
1990: # memory caching of that key.
1991: sub navhash {
1992: my $self = shift; my $key = shift;
1993: return $self->{NAV_HASH}->{$key};
1994: }
1995:
1996: =pod
1997:
1998: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1999: false otherwise. Undefined course maps indicate an error somewhere in
2000: LON-CAPA, and you will not be able to proceed with using the navmap.
2001: See the B<NAV> screen for an example of using this.
2002:
2003: =cut
2004:
2005: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2006: sub courseMapDefined {
2007: my $self = shift;
2008: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2009:
2010: my $firstres = $self->navhash("map_start_$uri");
2011: my $lastres = $self->navhash("map_finish_$uri");
2012: return $firstres && $lastres;
2013: }
2014:
2015: sub getIterator {
2016: my $self = shift;
2017: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2018: shift, undef, shift,
2019: shift, shift);
2020: return $iterator;
2021: }
2022:
2023: # Private method: Does the given resource (as a symb string) have
2024: # current discussion? Returns 0 if chat/mail data not extracted.
2025: sub hasDiscussion {
2026: my $self = shift;
2027: my $symb = shift;
2028: $self->generate_email_discuss_status();
2029:
2030: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2031:
2032: #return defined($self->{DISCUSSION_TIME}->{$symb});
2033:
2034: # backward compatibility (bulletin boards used to be 'wrapped')
2035: my $ressymb = $self->wrap_symb($symb);
2036: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2037: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2038: } else {
2039: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2040: return $self->{DISCUSSION_TIME}->{$ressymb} > 0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
2041: }
2042: }
2043:
2044: sub last_post_time {
2045: my $self = shift;
2046: my $symb = shift;
2047: my $ressymb = $self->wrap_symb($symb);
2048: return $self->{DISCUSSION_TIME}->{$ressymb};
2049: }
2050:
2051: sub discussion_info {
2052: my $self = shift;
2053: my $symb = shift;
2054: my $filter = shift;
2055:
2056: $self->get_discussion_data();
2057:
2058: my $ressymb = $self->wrap_symb($symb);
2059: # keys used to store bulletinboard postings use 'unwrapped' symb.
2060: my $discsymb = &escape($self->unwrap_symb($ressymb));
2061: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2062: if (!$version) { return; }
2063:
2064: my $prevread = $self->{LAST_READ}{$ressymb};
2065:
2066: my $count = 0;
2067: my $hiddenflag = 0;
2068: my $deletedflag = 0;
2069: my ($hidden,$deleted,%info);
2070:
2071: for (my $id=$version; $id>0; $id--) {
2072: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2073: my @keys=split(/:/,$vkeys);
2074: if (grep(/^hidden$/ ,@keys)) {
2075: if (!$hiddenflag) {
2076: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2077: $hiddenflag = 1;
2078: }
2079: } elsif (grep(/^deleted$/,@keys)) {
2080: if (!$deletedflag) {
2081: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2082: $deletedflag = 1;
2083: }
2084: } else {
2085: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2086: if ($filter eq 'unread') {
2087: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2088: next;
2089: }
2090: }
2091: $count++;
2092: $info{$count}{'subject'} =
2093: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2094: $info{$count}{'id'} = $id;
2095: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2096: }
2097: }
2098: }
2099: if (wantarray) {
2100: return ($count,%info);
2101: }
2102: return $count;
2103: }
2104:
2105: sub wrap_symb {
2106: my $self = shift;
2107: my $symb = shift;
2108: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2109: unless ($symb =~ m|adm/wrapper/adm|) {
2110: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2111: }
2112: }
2113: return $symb;
2114: }
2115:
2116: sub unwrap_symb {
2117: my $self = shift;
2118: my $ressymb = shift;
2119: my $discsymb = $ressymb;
2120: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2121: $discsymb = $1.$2;
2122: }
2123: return $discsymb;
2124: }
2125:
2126: # Private method: Does the given resource (as a symb string) have
2127: # current feedback? Returns the string in the feedback hash, which
2128: # will be false if it does not exist.
2129:
2130: sub getFeedback {
2131: my $self = shift;
2132: my $symb = shift;
2133: my $source = shift;
2134:
2135: $self->generate_email_discuss_status();
2136:
2137: if (!defined($self->{FEEDBACK})) { return ""; }
2138:
2139: my $feedback;
2140: if ($self->{FEEDBACK}->{$symb}) {
2141: $feedback = $self->{FEEDBACK}->{$symb};
2142: if ($self->{FEEDBACK}->{$source}) {
2143: $feedback .= ','.$self->{FEEDBACK}->{$source};
2144: }
2145: } else {
2146: if ($self->{FEEDBACK}->{$source}) {
2147: $feedback = $self->{FEEDBACK}->{$source};
2148: }
2149: }
2150: return $feedback;
2151: }
2152:
2153: # Private method: Get the errors for that resource (by source).
2154: sub getErrors {
2155: my $self = shift;
2156: my $symb = shift;
2157: my $src = shift;
2158:
2159: $self->generate_email_discuss_status();
2160:
2161: if (!defined($self->{ERROR_MSG})) { return ""; }
2162:
2163: my $errors;
2164: if ($self->{ERROR_MSG}->{$symb}) {
2165: $errors = $self->{ERROR_MSG}->{$symb};
2166: if ($self->{ERROR_MSG}->{$src}) {
2167: $errors .= ','.$self->{ERROR_MSG}->{$src};
2168: }
2169: } else {
2170: if ($self->{ERROR_MSG}->{$src}) {
2171: $errors = $self->{ERROR_MSG}->{$src};
2172: }
2173: }
2174: return $errors;
2175: }
2176:
2177: =pod
2178:
2179: =item * B<getById>(id):
2180:
2181: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2182: object for that resource. This method, or other methods that use it
2183: (as in the resource object) is the only proper way to obtain a
2184: resource object.
2185:
2186: =item * B<getBySymb>(symb):
2187:
2188: Based on the symb of the resource, get a resource object for that
2189: resource. This is one of the proper ways to get a resource object.
2190:
2191: =item * B<getMapByMapPc>(map_pc):
2192:
2193: Based on the map_pc of the resource, get a resource object for
2194: the given map. This is one of the proper ways to get a resource object.
2195:
2196: =cut
2197:
2198: # The strategy here is to cache the resource objects, and only construct them
2199: # as we use them. The real point is to prevent reading any more from the tied
2200: # hash than we have to, which should hopefully alleviate speed problems.
2201:
2202: sub getById {
2203: my $self = shift;
2204: my $id = shift;
2205:
2206: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2207: {
2208: return $self->{RESOURCE_CACHE}->{$id};
2209: }
2210:
2211: # resource handles inserting itself into cache.
2212: # Not clear why the quotes are necessary, but as of this
2213: # writing it doesn't work without them.
2214: return "Apache::lonnavmaps::resource"->new($self, $id);
2215: }
2216:
2217: sub getBySymb {
2218: my $self = shift;
2219: my $symb = shift;
2220:
2221: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2222: my $map = $self->getResourceByUrl($mapUrl);
2223: my $returnvalue = undef;
2224: if (ref($map)) {
2225: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2226: }
2227: return $returnvalue;
2228: }
2229:
2230: sub getByMapPc {
2231: my $self = shift;
2232: my $map_pc = shift;
2233: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2234: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2235: return $self->getById($map_id);
2236: }
2237:
2238: =pod
2239:
2240: =item * B<firstResource>():
2241:
2242: Returns a resource object reference corresponding to the first
2243: resource in the navmap.
2244:
2245: =cut
2246:
2247: sub firstResource {
2248: my $self = shift;
2249: my $firstResource = $self->navhash('map_start_' .
2250: &Apache::lonnet::clutter($env{'request.course.uri'}));
2251: return $self->getById($firstResource);
2252: }
2253:
2254: =pod
2255:
2256: =item * B<finishResource>():
2257:
2258: Returns a resource object reference corresponding to the last resource
2259: in the navmap.
2260:
2261: =cut
2262:
2263: sub finishResource {
2264: my $self = shift;
2265: my $firstResource = $self->navhash('map_finish_' .
2266: &Apache::lonnet::clutter($env{'request.course.uri'}));
2267: return $self->getById($firstResource);
2268: }
2269:
2270: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2271: # the actual lookup; parmval caches the results.
2272: sub parmval {
2273: my $self = shift;
2274: my ($what,$symb,$recurse)=@_;
2275: my $hashkey = $what."|||".$symb;
2276:
2277: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2278: return $self->{PARM_CACHE}->{$hashkey};
2279: }
2280:
2281: my $result = $self->parmval_real($what, $symb, $recurse);
2282: $self->{PARM_CACHE}->{$hashkey} = $result;
2283: return $result;
2284: }
2285:
2286: sub parmval_real {
2287: my $self = shift;
2288: my ($what,$symb,$recurse) = @_;
2289:
2290: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2291: $self->generate_course_user_opt();
2292:
2293: my $cid=$env{'request.course.id'};
2294: my $csec=$env{'request.course.sec'};
2295: my $cgroup='';
2296: my @cgrps=split(/:/,$env{'request.course.groups'});
2297: if (@cgrps > 0) {
2298: @cgrps = sort(@cgrps);
2299: $cgroup = $cgrps[0];
2300: }
2301: my $uname=$env{'user.name'};
2302: my $udom=$env{'user.domain'};
2303:
2304: unless ($symb) { return ''; }
2305: my $result='';
2306:
2307: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2308: $mapname = &Apache::lonnet::deversion($mapname);
2309: # ----------------------------------------------------- Cascading lookup scheme
2310: my $rwhat=$what;
2311: $what=~s/^parameter\_//;
2312: $what=~s/\_/\./;
2313:
2314: my $symbparm=$symb.'.'.$what;
2315: my $mapparm=$mapname.'___(all).'.$what;
2316: my $usercourseprefix=$cid;
2317:
2318: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2319: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2320: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2321:
2322: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2323: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2324: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2325:
2326: my $courselevel= $usercourseprefix.'.'.$what;
2327: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2328: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2329:
2330: my $useropt = $self->{USER_OPT};
2331: my $courseopt = $self->{COURSE_OPT};
2332: my $parmhash = $self->{PARM_HASH};
2333:
2334: # ---------------------------------------------------------- first, check user
2335: if ($uname and defined($useropt)) {
2336: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2337: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2338: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2339: }
2340:
2341: # ------------------------------------------------------- second, check course
2342: if ($cgroup ne '' and defined($courseopt)) {
2343: if (defined($$courseopt{$grplevelr})) { return $$courseopt{$grplevelr}; }
2344: if (defined($$courseopt{$grplevelm})) { return $$courseopt{$grplevelm}; }
2345: if (defined($$courseopt{$grplevel})) { return $$courseopt{$grplevel}; }
2346: }
2347:
2348: if ($csec and defined($courseopt)) {
2349: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2350: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2351: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2352: }
2353:
2354: if (defined($courseopt)) {
2355: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2356: }
2357:
2358: # ----------------------------------------------------- third, check map parms
2359:
2360: my $thisparm=$$parmhash{$symbparm};
2361: if (defined($thisparm)) { return $thisparm; }
2362:
2363: # ----------------------------------------------------- fourth , check default
2364:
2365: my $meta_rwhat=$rwhat;
2366: $meta_rwhat=~s/\./_/g;
2367: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2368: if (defined($default)) { return $default}
2369: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2370: if (defined($default)) { return $default}
2371:
2372: # --------------------------------------------------- fifth, check more course
2373: if (defined($courseopt)) {
2374: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2375: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2376: }
2377:
2378: # --------------------------------------------------- sixth , cascade up parts
2379:
2380: my ($space,@qualifier)=split(/\./,$rwhat);
2381: my $qualifier=join('.',@qualifier);
2382: unless ($space eq '0') {
2383: my @parts=split(/_/,$space);
2384: my $id=pop(@parts);
2385: my $part=join('_',@parts);
2386: if ($part eq '') { $part='0'; }
2387: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2388: if (defined($partgeneral)) { return $partgeneral; }
2389: }
2390: if ($recurse) { return undef; }
2391: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2392: if (defined($pack_def)) { return $pack_def; }
2393: return '';
2394: }
2395:
2396: =pod
2397:
2398: =item * B<getResourceByUrl>(url,multiple):
2399:
2400: Retrieves a resource object by URL of the resource, unless the optional
2401: multiple parameter is included in which case an array of resource
2402: objects is returned. If passed a resource object, it will simply return
2403: it, so it is safe to use this method in code like
2404: "$res = $navmap->getResourceByUrl($res)"
2405: if you're not sure if $res is already an object, or just a URL. If the
2406: resource appears multiple times in the course, only the first instance
2407: will be returned (useful for maps), unless the multiple parameter has
2408: been included, in which case all instances are returned in an array.
2409:
2410: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2411:
2412: The map is a specification of a map to retreive the resources from,
2413: either as a url or as an object. The filterFunc is a reference to a
2414: function that takes a resource object as its one argument and returns
2415: true if the resource should be included, or false if it should not
2416: be. If recursive is true, the map will be recursively examined,
2417: otherwise it will not be. If bailout is true, the function will return
2418: as soon as it finds a resource, if false it will finish. If showall is
2419: true it will not hide maps that contain nothing but one other map. By
2420: default, the map is the top-level map of the course, filterFunc is a
2421: function that always returns 1, recursive is true, bailout is false,
2422: showall is false. The resources will be returned in a list containing
2423: the resource objects for the corresponding resources, with B<no
2424: structure information> in the list; regardless of branching,
2425: recursion, etc., it will be a flat list.
2426:
2427: Thus, this is suitable for cases where you don't want the structure,
2428: just a list of all resources. It is also suitable for finding out how
2429: many resources match a given description; for this use, if all you
2430: want to know is if I<any> resources match the description, the bailout
2431: parameter will allow you to avoid potentially expensive enumeration of
2432: all matching resources.
2433:
2434: =item * B<hasResource>(map, filterFunc, recursive, showall):
2435:
2436: Convenience method for
2437:
2438: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2439:
2440: which will tell whether the map has resources matching the description
2441: in the filter function.
2442:
2443: =item * B<usedVersion>(url):
2444:
2445: Retrieves version infomation for a url. Returns the version (a number, or
2446: the string "mostrecent") for resources which have version information in
2447: the big hash.
2448:
2449: =cut
2450:
2451:
2452: sub getResourceByUrl {
2453: my $self = shift;
2454: my $resUrl = shift;
2455: my $multiple = shift;
2456:
2457: if (ref($resUrl)) { return $resUrl; }
2458:
2459: $resUrl = &Apache::lonnet::clutter($resUrl);
2460: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2461: if (!$resId) { return ''; }
2462: if ($multiple) {
2463: my @resources = ();
2464: my @resIds = split (/,/, $resId);
2465: foreach my $id (@resIds) {
2466: my $resourceId = $self->getById($id);
2467: if ($resourceId) {
2468: push(@resources,$resourceId);
2469: }
2470: }
2471: return @resources;
2472: } else {
2473: if ($resId =~ /,/) {
2474: $resId = (split (/,/, $resId))[0];
2475: }
2476: return $self->getById($resId);
2477: }
2478: }
2479:
2480: sub retrieveResources {
2481: my $self = shift;
2482: my $map = shift;
2483: my $filterFunc = shift;
2484: if (!defined ($filterFunc)) {
2485: $filterFunc = sub {return 1;};
2486: }
2487: my $recursive = shift;
2488: if (!defined($recursive)) { $recursive = 1; }
2489: my $bailout = shift;
2490: if (!defined($bailout)) { $bailout = 0; }
2491: my $showall = shift;
2492: # Create the necessary iterator.
2493: if (!ref($map)) { # assume it's a url of a map.
2494: $map = $self->getResourceByUrl($map);
2495: }
2496:
2497: # If nothing was passed, assume top-level map
2498: if (!$map) {
2499: $map = $self->getById('0.0');
2500: }
2501:
2502: # Check the map's validity.
2503: if (!$map->is_map()) {
2504: # Oh, to throw an exception.... how I'd love that!
2505: return ();
2506: }
2507:
2508: # Get an iterator.
2509: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2510: undef, $recursive, $showall);
2511:
2512: my @resources = ();
2513:
2514: # Run down the iterator and collect the resources.
2515: my $curRes;
2516:
2517: while ($curRes = $it->next()) {
2518: if (ref($curRes)) {
2519: if (!&$filterFunc($curRes)) {
2520: next;
2521: }
2522:
2523: push @resources, $curRes;
2524:
2525: if ($bailout) {
2526: return @resources;
2527: }
2528: }
2529:
2530: }
2531:
2532: return @resources;
2533: }
2534:
2535: sub hasResource {
2536: my $self = shift;
2537: my $map = shift;
2538: my $filterFunc = shift;
2539: my $recursive = shift;
2540: my $showall = shift;
2541:
2542: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2543: }
2544:
2545: sub usedVersion {
2546: my $self = shift;
2547: my $linkurl = shift;
2548: return $self->navhash("version_$linkurl");
2549: }
2550:
2551: 1;
2552:
2553: package Apache::lonnavmaps::iterator;
2554: use Scalar::Util qw(weaken);
2555: use Apache::lonnet;
2556:
2557: =pod
2558:
2559: =back
2560:
2561: =head1 Object: navmap Iterator
2562:
2563: An I<iterator> encapsulates the logic required to traverse a data
2564: structure. navmap uses an iterator to traverse the course map
2565: according to the criteria you wish to use.
2566:
2567: To obtain an iterator, call the B<getIterator>() function of a
2568: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2569: directly.) This will return a reference to the iterator:
2570:
2571: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2572:
2573: To get the next thing from the iterator, call B<next>:
2574:
2575: C<my $nextThing = $resourceIterator-E<gt>next()>
2576:
2577: getIterator behaves as follows:
2578:
2579: =over 4
2580:
2581: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2582:
2583: All parameters are optional. firstResource is a resource reference
2584: corresponding to where the iterator should start. It defaults to
2585: navmap->firstResource() for the corresponding nav map. finishResource
2586: corresponds to where you want the iterator to end, defaulting to
2587: navmap->finishResource(). filterHash is a hash used as a set
2588: containing strings representing the resource IDs, defaulting to
2589: empty. Condition is a 1 or 0 that sets what to do with the filter
2590: hash: If a 0, then only resources that exist IN the filterHash will be
2591: recursed on. If it is a 1, only resources NOT in the filterHash will
2592: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2593: false (default), the iterator will only return the first level of map
2594: that is not just a single, 'redirecting' map. If true, the iterator
2595: will return all information, starting with the top-level map,
2596: regardless of content. returnTopMap, if true (default false), will
2597: cause the iterator to return the top-level map object (resource 0.0)
2598: before anything else.
2599:
2600: Thus, by default, only top-level resources will be shown. Change the
2601: condition to a 1 without changing the hash, and all resources will be
2602: shown. Changing the condition to 1 and including some values in the
2603: hash will allow you to selectively suppress parts of the navmap, while
2604: leaving it on 0 and adding things to the hash will allow you to
2605: selectively add parts of the nav map. See the handler code for
2606: examples.
2607:
2608: The iterator will return either a reference to a resource object, or a
2609: token representing something in the map, such as the beginning of a
2610: new branch. The possible tokens are:
2611:
2612: =over 4
2613:
2614: =item * B<END_ITERATOR>:
2615:
2616: The iterator has returned all that it's going to. Further calls to the
2617: iterator will just produce more of these. This is a "false" value, and
2618: is the only false value the iterator which will be returned, so it can
2619: be used as a loop sentinel.
2620:
2621: =item * B<BEGIN_MAP>:
2622:
2623: A new map is being recursed into. This is returned I<after> the map
2624: resource itself is returned.
2625:
2626: =item * B<END_MAP>:
2627:
2628: The map is now done.
2629:
2630: =item * B<BEGIN_BRANCH>:
2631:
2632: A branch is now starting. The next resource returned will be the first
2633: in that branch.
2634:
2635: =item * B<END_BRANCH>:
2636:
2637: The branch is now done.
2638:
2639: =back
2640:
2641: The tokens are retreivable via methods on the iterator object, i.e.,
2642: $iterator->END_MAP.
2643:
2644: Maps can contain empty resources. The iterator will automatically skip
2645: over such resources, but will still treat the structure
2646: correctly. Thus, a complicated map with several branches, but
2647: consisting entirely of empty resources except for one beginning or
2648: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2649: but only one resource will be returned.
2650:
2651: =back
2652:
2653: =head2 Normal Usage
2654:
2655: Normal usage of the iterator object is to do the following:
2656:
2657: my $it = $navmap->getIterator([your params here]);
2658: my $curRes;
2659: while ($curRes = $it->next()) {
2660: [your logic here]
2661: }
2662:
2663: Note that inside of the loop, it's frequently useful to check if
2664: "$curRes" is a reference or not with the reference function; only
2665: resource objects will be references, and any non-references will
2666: be the tokens described above.
2667:
2668: Also note there is some old code floating around that trys to track
2669: the depth of the iterator to see when it's done; do not copy that
2670: code. It is difficult to get right and harder to understand than
2671: this. They should be migrated to this new style.
2672:
2673: =cut
2674:
2675: # Here are the tokens for the iterator:
2676:
2677: sub END_ITERATOR { return 0; }
2678: sub BEGIN_MAP { return 1; } # begining of a new map
2679: sub END_MAP { return 2; } # end of the map
2680: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2681: sub END_BRANCH { return 4; } # end of a branch
2682: sub FORWARD { return 1; } # go forward
2683: sub BACKWARD { return 2; }
2684:
2685: sub min {
2686: (my $a, my $b) = @_;
2687: if ($a < $b) { return $a; } else { return $b; }
2688: }
2689:
2690: sub new {
2691: # magic invocation to create a class instance
2692: my $proto = shift;
2693: my $class = ref($proto) || $proto;
2694: my $self = {};
2695:
2696: weaken($self->{NAV_MAP} = shift);
2697: return undef unless ($self->{NAV_MAP});
2698:
2699: # Handle the parameters
2700: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2701: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2702:
2703: # If the given resources are just the ID of the resource, get the
2704: # objects
2705: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2706: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2707: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2708: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2709:
2710: $self->{FILTER} = shift;
2711:
2712: # A hash, used as a set, of resource already seen
2713: $self->{ALREADY_SEEN} = shift;
2714: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2715: $self->{CONDITION} = shift;
2716:
2717: # Do we want to automatically follow "redirection" maps?
2718: $self->{FORCE_TOP} = shift;
2719:
2720: # Do we want to return the top-level map object (resource 0.0)?
2721: $self->{RETURN_0} = shift;
2722: # have we done that yet?
2723: $self->{HAVE_RETURNED_0} = 0;
2724:
2725: # Now, we need to pre-process the map, by walking forward and backward
2726: # over the parts of the map we're going to look at.
2727:
2728: # The processing steps are exactly the same, except for a few small
2729: # changes, so I bundle those up in the following list of two elements:
2730: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2731: # first_resource).
2732: # This prevents writing nearly-identical code twice.
2733: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2734: 'FIRST_RESOURCE'],
2735: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2736: 'FINISH_RESOURCE'] );
2737:
2738: my $maxDepth = 0; # tracks max depth
2739:
2740: # If there is only one resource in this map, and it's a map, we
2741: # want to remember that, so the user can ask for the first map
2742: # that isn't just a redirector.
2743: my $resource; my $resourceCount = 0;
2744:
2745: # Documentation on this algorithm can be found in the CVS repository at
2746: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2747: # in that file.
2748: # **1**
2749:
2750: foreach my $pass (@iterations) {
2751: my $direction = $pass->[0];
2752: my $valName = $pass->[1];
2753: my $nextResourceMethod = $pass->[2];
2754: my $firstResourceName = $pass->[3];
2755:
2756: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2757: $self->{FIRST_RESOURCE},
2758: $self->{FINISH_RESOURCE},
2759: {}, undef, 0, $direction);
2760:
2761: # prime the recursion
2762: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2763: $iterator->next();
2764: my $curRes = $iterator->next();
2765: my $depth = 1;
2766: while ($depth > 0) {
2767: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2768: if ($curRes == $iterator->END_MAP()) { $depth--; }
2769:
2770: if (ref($curRes)) {
2771: # If there's only one resource, this will save it
2772: # we have to filter empty resources from consideration here,
2773: # or even "empty", redirecting maps have two (start & finish)
2774: # or three (start, finish, plus redirector)
2775: if($direction == FORWARD && $curRes->src()) {
2776: $resource = $curRes; $resourceCount++;
2777: }
2778: my $resultingVal = $curRes->{DATA}->{$valName};
2779: my $nextResources = $curRes->$nextResourceMethod();
2780: my $nextCount = scalar(@{$nextResources});
2781:
2782: if ($nextCount == 1) { # **3**
2783: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2784: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2785: }
2786:
2787: if ($nextCount > 1) { # **4**
2788: foreach my $res (@{$nextResources}) {
2789: my $current = $res->{DATA}->{$valName} || 999999999;
2790: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2791: }
2792: }
2793: }
2794:
2795: # Assign the final val (**2**)
2796: if (ref($curRes) && $direction == BACKWARD()) {
2797: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2798: $curRes->{DATA}->{BOT_UP_VAL});
2799:
2800: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2801: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2802: }
2803:
2804: $curRes = $iterator->next();
2805: }
2806: }
2807:
2808: # Check: Was this only one resource, a map?
2809: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2810: my $firstResource = $resource->map_start();
2811: my $finishResource = $resource->map_finish();
2812: return
2813: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2814: $finishResource, $self->{FILTER},
2815: $self->{ALREADY_SEEN},
2816: $self->{CONDITION},
2817: $self->{FORCE_TOP});
2818:
2819: }
2820:
2821: # Set up some bookkeeping information.
2822: $self->{CURRENT_DEPTH} = 0;
2823: $self->{MAX_DEPTH} = $maxDepth;
2824: $self->{STACK} = [];
2825: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2826: $self->{FINISHED} = 0; # When true, the iterator has finished
2827:
2828: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2829: push @{$self->{STACK}}, [];
2830: }
2831:
2832: # Prime the recursion w/ the first resource **5**
2833: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2834: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2835:
2836: bless ($self);
2837:
2838: return $self;
2839: }
2840:
2841: sub next {
2842: my $self = shift;
2843: my $closeAllPages=shift;
2844: if ($self->{FINISHED}) {
2845: return END_ITERATOR();
2846: }
2847:
2848: # If we want to return the top-level map object, and haven't yet,
2849: # do so.
2850: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2851: $self->{HAVE_RETURNED_0} = 1;
2852: return $self->{NAV_MAP}->getById('0.0');
2853: }
2854:
2855: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2856: # grab the next from the recursive iterator
2857: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2858:
2859: # is it a begin or end map? If so, update the depth
2860: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2861: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2862:
2863: # Are we back at depth 0? If so, stop recursing
2864: if ($self->{RECURSIVE_DEPTH} == 0) {
2865: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2866: }
2867:
2868: return $next;
2869: }
2870:
2871: if (defined($self->{FORCE_NEXT})) {
2872: my $tmp = $self->{FORCE_NEXT};
2873: $self->{FORCE_NEXT} = undef;
2874: return $tmp;
2875: }
2876:
2877: # Have we not yet begun? If not, return BEGIN_MAP and
2878: # remember we've started.
2879: if ( !$self->{STARTED} ) {
2880: $self->{STARTED} = 1;
2881: return $self->BEGIN_MAP();
2882: }
2883:
2884: # Here's the guts of the iterator.
2885:
2886: # Find the next resource, if any.
2887: my $found = 0;
2888: my $i = $self->{MAX_DEPTH};
2889: my $newDepth;
2890: my $here;
2891: while ( $i >= 0 && !$found ) {
2892: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2893: $here = pop @{$self->{STACK}->[$i]}; # **7**
2894: $found = 1;
2895: $newDepth = $i;
2896: }
2897: $i--;
2898: }
2899:
2900: # If we still didn't find anything, we're done.
2901: if ( !$found ) {
2902: # We need to get back down to the correct branch depth
2903: if ( $self->{CURRENT_DEPTH} > 0 ) {
2904: $self->{CURRENT_DEPTH}--;
2905: return END_BRANCH();
2906: } else {
2907: $self->{FINISHED} = 1;
2908: return END_MAP();
2909: }
2910: }
2911:
2912: # If this is not a resource, it must be an END_BRANCH marker we want
2913: # to return directly.
2914: if (!ref($here)) { # **8**
2915: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2916: $self->{CURRENT_DEPTH}--;
2917: return $here;
2918: }
2919: }
2920:
2921: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2922: $self->{HERE} = $here;
2923:
2924: # Get to the right level
2925: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2926: push @{$self->{STACK}->[$newDepth]}, $here;
2927: $self->{CURRENT_DEPTH}--;
2928: return END_BRANCH();
2929: }
2930: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2931: push @{$self->{STACK}->[$newDepth]}, $here;
2932: $self->{CURRENT_DEPTH}++;
2933: return BEGIN_BRANCH();
2934: }
2935:
2936: # If we made it here, we have the next resource, and we're at the
2937: # right branch level. So let's examine the resource for where
2938: # we can get to from here.
2939:
2940: # So we need to look at all the resources we can get to from here,
2941: # categorize them if we haven't seen them, remember if we have a new
2942: my $nextUnfiltered = $here->getNext();
2943: my $maxDepthAdded = -1;
2944:
2945: for (@$nextUnfiltered) {
2946: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2947: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2948: push @{$self->{STACK}->[$depth]}, $_;
2949: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2950: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2951: }
2952: }
2953:
2954: # Is this the end of a branch? If so, all of the resources examined above
2955: # led to lower levels than the one we are currently at, so we push a END_BRANCH
2956: # marker onto the stack so we don't forget.
2957: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2958: # BC branch and gets to C, it will see F as the only next resource, but it's
2959: # one level lower. Thus, this is the end of the branch, since there are no
2960: # more resources added to this level or above.
2961: # We don't do this if the examined resource is the finish resource,
2962: # because the condition given above is true, but the "END_MAP" will
2963: # take care of things and we should already be at depth 0.
2964: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2965: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2966: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2967: }
2968:
2969: # That ends the main iterator logic. Now, do we want to recurse
2970: # down this map (if this resource is a map)?
2971: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
2972: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2973: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2974: my $firstResource = $self->{HERE}->map_start();
2975: my $finishResource = $self->{HERE}->map_finish();
2976:
2977: $self->{RECURSIVE_ITERATOR} =
2978: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2979: $finishResource, $self->{FILTER},
2980: $self->{ALREADY_SEEN},
2981: $self->{CONDITION},
2982: $self->{FORCE_TOP});
2983: }
2984:
2985: # If this is a blank resource, don't actually return it.
2986: # Should you ever find you need it, make sure to add an option to the code
2987: # that you can use; other things depend on this behavior.
2988: my $browsePriv = $self->{HERE}->browsePriv();
2989: if (!$self->{HERE}->src() ||
2990: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2991: return $self->next($closeAllPages);
2992: }
2993:
2994: return $self->{HERE};
2995:
2996: }
2997:
2998: =pod
2999:
3000: The other method available on the iterator is B<getStack>, which
3001: returns an array populated with the current 'stack' of maps, as
3002: references to the resource objects. Example: This is useful when
3003: making the navigation map, as we need to check whether we are under a
3004: page map to see if we need to link directly to the resource, or to the
3005: page. The first elements in the array will correspond to the top of
3006: the stack (most inclusive map).
3007:
3008: =cut
3009:
3010: sub getStack {
3011: my $self=shift;
3012:
3013: my @stack;
3014:
3015: $self->populateStack(\@stack);
3016:
3017: return \@stack;
3018: }
3019:
3020: # Private method: Calls the iterators recursively to populate the stack.
3021: sub populateStack {
3022: my $self=shift;
3023: my $stack = shift;
3024:
3025: push @$stack, $self->{HERE} if ($self->{HERE});
3026:
3027: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3028: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3029: }
3030: }
3031:
3032: 1;
3033:
3034: package Apache::lonnavmaps::DFSiterator;
3035: use Scalar::Util qw(weaken);
3036: use Apache::lonnet;
3037:
3038: # Not documented in the perldoc: This is a simple iterator that just walks
3039: # through the nav map and presents the resources in a depth-first search
3040: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3041: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3042: # useful for pre-processing of some kind, and is in fact used by the main
3043: # iterator that way, but that's about it.
3044: # One could imagine merging this into the init routine of the main iterator,
3045: # but this might as well be left separate, since it is possible some other
3046: # use might be found for it. - Jeremy
3047:
3048: # Unlike the main iterator, this DOES return all resources, even blank ones.
3049: # The main iterator needs them to correctly preprocess the map.
3050:
3051: sub BEGIN_MAP { return 1; } # begining of a new map
3052: sub END_MAP { return 2; } # end of the map
3053: sub FORWARD { return 1; } # go forward
3054: sub BACKWARD { return 2; }
3055:
3056: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3057: # filter hash ref (or undef), already seen hash or undef, condition
3058: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3059: sub new {
3060: # magic invocation to create a class instance
3061: my $proto = shift;
3062: my $class = ref($proto) || $proto;
3063: my $self = {};
3064:
3065: weaken($self->{NAV_MAP} = shift);
3066: return undef unless ($self->{NAV_MAP});
3067:
3068: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3069: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3070:
3071: # If the given resources are just the ID of the resource, get the
3072: # objects
3073: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3074: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3075: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3076: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3077:
3078: $self->{FILTER} = shift;
3079:
3080: # A hash, used as a set, of resource already seen
3081: $self->{ALREADY_SEEN} = shift;
3082: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3083: $self->{CONDITION} = shift;
3084: $self->{DIRECTION} = shift || FORWARD();
3085:
3086: # Flag: Have we started yet?
3087: $self->{STARTED} = 0;
3088:
3089: # Should we continue calling the recursive iterator, if any?
3090: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3091: # The recursive iterator, if any
3092: $self->{RECURSIVE_ITERATOR} = undef;
3093: # Are we recursing on a map, or a branch?
3094: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3095: # And the count of how deep it is, so that this iterator can keep track of
3096: # when to pick back up again.
3097: $self->{RECURSIVE_DEPTH} = 0;
3098:
3099: # For keeping track of our branches, we maintain our own stack
3100: $self->{STACK} = [];
3101:
3102: # Start with the first resource
3103: if ($self->{DIRECTION} == FORWARD) {
3104: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3105: } else {
3106: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3107: }
3108:
3109: bless($self);
3110: return $self;
3111: }
3112:
3113: sub next {
3114: my $self = shift;
3115:
3116: # Are we using a recursive iterator? If so, pull from that and
3117: # watch the depth; we want to resume our level at the correct time.
3118: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3119: # grab the next from the recursive iterator
3120: my $next = $self->{RECURSIVE_ITERATOR}->next();
3121:
3122: # is it a begin or end map? Update depth if so
3123: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3124: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3125:
3126: # Are we back at depth 0? If so, stop recursing.
3127: if ($self->{RECURSIVE_DEPTH} == 0) {
3128: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3129: }
3130:
3131: return $next;
3132: }
3133:
3134: # Is there a current resource to grab? If not, then return
3135: # END_MAP, which will end the iterator.
3136: if (scalar(@{$self->{STACK}}) == 0) {
3137: return $self->END_MAP();
3138: }
3139:
3140: # Have we not yet begun? If not, return BEGIN_MAP and
3141: # remember that we've started.
3142: if ( !$self->{STARTED} ) {
3143: $self->{STARTED} = 1;
3144: return $self->BEGIN_MAP;
3145: }
3146:
3147: # Get the next resource in the branch
3148: $self->{HERE} = pop @{$self->{STACK}};
3149:
3150: # remember that we've seen this, so we don't return it again later
3151: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3152:
3153: # Get the next possible resources
3154: my $nextUnfiltered;
3155: if ($self->{DIRECTION} == FORWARD()) {
3156: $nextUnfiltered = $self->{HERE}->getNext();
3157: } else {
3158: $nextUnfiltered = $self->{HERE}->getPrevious();
3159: }
3160: my $next = [];
3161:
3162: # filter the next possibilities to remove things we've
3163: # already seen.
3164: foreach my $item (@$nextUnfiltered) {
3165: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3166: push @$next, $item;
3167: }
3168: }
3169:
3170: while (@$next) {
3171: # copy the next possibilities over to the stack
3172: push @{$self->{STACK}}, shift @$next;
3173: }
3174:
3175: # If this is a map and we want to recurse down it... (not filtered out)
3176: if ($self->{HERE}->is_map() &&
3177: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3178: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3179: my $firstResource = $self->{HERE}->map_start();
3180: my $finishResource = $self->{HERE}->map_finish();
3181:
3182: $self->{RECURSIVE_ITERATOR} =
3183: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3184: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3185: $self->{CONDITION}, $self->{DIRECTION});
3186: }
3187:
3188: return $self->{HERE};
3189: }
3190:
3191: # Identical to the full iterator methods of the same name. Hate to copy/paste
3192: # but I also hate to "inherit" either iterator from the other.
3193:
3194: sub getStack {
3195: my $self=shift;
3196:
3197: my @stack;
3198:
3199: $self->populateStack(\@stack);
3200:
3201: return \@stack;
3202: }
3203:
3204: # Private method: Calls the iterators recursively to populate the stack.
3205: sub populateStack {
3206: my $self=shift;
3207: my $stack = shift;
3208:
3209: push @$stack, $self->{HERE} if ($self->{HERE});
3210:
3211: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3212: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3213: }
3214: }
3215:
3216: 1;
3217:
3218: package Apache::lonnavmaps::resource;
3219: use Scalar::Util qw(weaken);
3220: use Apache::lonnet;
3221:
3222: =pod
3223:
3224: =head1 Object: resource
3225:
3226: X<resource, navmap object>
3227: A resource object encapsulates a resource in a resource map, allowing
3228: easy manipulation of the resource, querying the properties of the
3229: resource (including user properties), and represents a reference that
3230: can be used as the canonical representation of the resource by
3231: lonnavmap clients like renderers.
3232:
3233: A resource only makes sense in the context of a navmap, as some of the
3234: data is stored in the navmap object.
3235:
3236: You will probably never need to instantiate this object directly. Use
3237: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3238: starting resource.
3239:
3240: Resource objects respect the parameter_hiddenparts, which suppresses
3241: various parts according to the wishes of the map author. As of this
3242: writing, there is no way to override this parameter, and suppressed
3243: parts will never be returned, nor will their response types or ids be
3244: stored.
3245:
3246: =head2 Overview
3247:
3248: A B<Resource> is the most granular type of object in LON-CAPA that can
3249: be included in a course. It can either be a particular resource, like
3250: an HTML page, external resource, problem, etc., or it can be a
3251: container sequence, such as a "page" or a "map".
3252:
3253: To see a sequence from the user's point of view, please see the
3254: B<Creating a Course: Maps and Sequences> chapter of the Author's
3255: Manual.
3256:
3257: A Resource Object, once obtained from a navmap object via a B<getBy*>
3258: method of the navmap, or from an iterator, allows you to query
3259: information about that resource.
3260:
3261: Generally, you do not ever want to create a resource object yourself,
3262: so creation has been left undocumented. Always retrieve resources
3263: from navmap objects.
3264:
3265: =head3 Identifying Resources
3266:
3267: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3268: unique to that resource for a given course. X<resource ID, in big hash>
3269: The Resource ID has the form #.#, where the first number is the same
3270: for every resource in a map, and the second is unique. For instance,
3271: for a course laid out like this:
3272:
3273: * Problem 1
3274: * Map
3275: * Resource 2
3276: * Resource 3
3277:
3278: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3279: C<Resource 3> will share a first number. The second number may end up
3280: re-used between the two groups.
3281:
3282: The resource ID is only used in the big hash, but can be used in the
3283: context of a course to identify a resource easily. (For instance, the
3284: printing system uses it to record which resources from a sequence you
3285: wish to print.)
3286:
3287: X<symb> X<resource, symb>
3288: All resources also have B<symb>s, which uniquely identify a resource
3289: in a course. Many internal LON-CAPA functions expect a symb. A symb
3290: carries along with it the URL of the resource, and the map it appears
3291: in. Symbs are much larger than resource IDs.
3292:
3293: =cut
3294:
3295: sub new {
3296: # magic invocation to create a class instance
3297: my $proto = shift;
3298: my $class = ref($proto) || $proto;
3299: my $self = {};
3300:
3301: weaken($self->{NAV_MAP} = shift);
3302: $self->{ID} = shift;
3303:
3304: # Store this new resource in the parent nav map's cache.
3305: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3306: $self->{RESOURCE_ERROR} = 0;
3307:
3308: # A hash that can be used by two-pass algorithms to store data
3309: # about this resource in. Not used by the resource object
3310: # directly.
3311: $self->{DATA} = {};
3312:
3313: bless($self);
3314:
3315: return $self;
3316: }
3317:
3318: # private function: simplify the NAV_HASH lookups we keep doing
3319: # pass the name, and to automatically append my ID, pass a true val on the
3320: # second param
3321: sub navHash {
3322: my $self = shift;
3323: my $param = shift;
3324: my $id = shift;
3325: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3326: }
3327:
3328: =pod
3329:
3330: =head2 Methods
3331:
3332: Once you have a resource object, here's what you can do with it:
3333:
3334: =head3 Attribute Retrieval
3335:
3336: Every resource has certain attributes that can be retrieved and used:
3337:
3338: =over 4
3339:
3340: =item * B<ID>: Every resource has an ID that is unique for that
3341: resource in the course it is in. The ID is actually in the hash
3342: representing the resource, so for a resource object $res, obtain
3343: it via C<$res->{ID}).
3344:
3345: =item * B<compTitle>:
3346:
3347: Returns a "composite title", that is equal to $res->title() if the
3348: resource has a title, and is otherwise the last part of the URL (e.g.,
3349: "problem.problem").
3350:
3351: =item * B<ext>:
3352:
3353: Returns true if the resource is external.
3354:
3355: =item * B<kind>:
3356:
3357: Returns the kind of the resource from the compiled nav map.
3358:
3359: =item * B<randomout>:
3360:
3361: Returns true if this resource was chosen to NOT be shown to the user
3362: by the random map selection feature. In other words, this is usually
3363: false.
3364:
3365: =item * B<randompick>:
3366:
3367: Returns true for a map if the randompick feature is being used on the
3368: map. (?)
3369:
3370: =item * B<src>:
3371:
3372: Returns the source for the resource.
3373:
3374: =item * B<symb>:
3375:
3376: Returns the symb for the resource.
3377:
3378: =item * B<title>:
3379:
3380: Returns the title of the resource.
3381:
3382: =back
3383:
3384: =cut
3385:
3386: # These info functions can be used directly, as they don't return
3387: # resource information.
3388: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3389: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3390: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3391: sub from { my $self=shift; return $self->navHash("from_", 1); }
3392: # considered private and undocumented
3393: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3394: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3395: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3396: sub randompick {
3397: my $self = shift;
3398: return $self->parmval('randompick');
3399: }
3400: sub link {
3401: my $self=shift;
3402: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3403: return $self->src;
3404: }
3405: sub src {
3406: my $self=shift;
3407: return $self->navHash("src_", 1);
3408: }
3409: sub shown_symb {
3410: my $self=shift;
3411: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3412: return $self->symb();
3413: }
3414: sub id {
3415: my $self=shift;
3416: return $self->{ID};
3417: }
3418: sub enclosing_map_src {
3419: my $self=shift;
3420: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3421: return $self->navHash('map_id_'.$first);
3422: }
3423: sub symb {
3424: my $self=shift;
3425: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3426: my $symbSrc = &Apache::lonnet::declutter($self->src());
3427: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3428: . '___' . $second . '___' . $symbSrc;
3429: return &Apache::lonnet::symbclean($symb);
3430: }
3431: sub wrap_symb {
3432: my $self = shift;
3433: return $self->{NAV_MAP}->wrap_symb($self->symb());
3434: }
3435: sub title {
3436: my $self=shift;
3437: if ($self->{ID} eq '0.0') {
3438: # If this is the top-level map, return the title of the course
3439: # since this map can not be titled otherwise.
3440: return $env{'course.'.$env{'request.course.id'}.'.description'};
3441: }
3442: return $self->navHash("title_", 1); }
3443: # considered private and undocumented
3444: sub to { my $self=shift; return $self->navHash("to_", 1); }
3445: sub condition {
3446: my $self=shift;
3447: my $undercond=$self->navHash("undercond_", 1);
3448: if (!defined($undercond)) { return 1; };
3449: my $condid=$self->navHash("condid_$undercond");
3450: if (!defined($condid)) { return 1; };
3451: my $condition=&Apache::lonnet::directcondval($condid);
3452: return $condition;
3453: }
3454: sub condval {
3455: my $self=shift;
3456: my ($pathname,$filename) =
3457: &Apache::lonnet::split_uri_for_cond($self->src());
3458:
3459: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3460: /\&\Q$filename\E\:([\d\|]+)\&/);
3461: if ($match) {
3462: return &Apache::lonnet::condval($1);
3463: }
3464: return 0;
3465: }
3466: sub compTitle {
3467: my $self = shift;
3468: my $title = $self->title();
3469: $title=~s/\&colon\;/\:/gs;
3470: if (!$title) {
3471: $title = $self->src();
3472: $title = substr($title, rindex($title, '/') + 1);
3473: }
3474: return $title;
3475: }
3476:
3477: =pod
3478:
3479: B<Predicate Testing the Resource>
3480:
3481: These methods are shortcuts to deciding if a given resource has a given property.
3482:
3483: =over 4
3484:
3485: =item * B<is_map>:
3486:
3487: Returns true if the resource is a map type.
3488:
3489: =item * B<is_problem>:
3490:
3491: Returns true if the resource is a problem type, false
3492: otherwise. (Looks at the extension on the src field; might need more
3493: to work correctly.)
3494:
3495: =item * B<is_page>:
3496:
3497: Returns true if the resource is a page.
3498:
3499: =item * B<is_sequence>:
3500:
3501: Returns true if the resource is a sequence.
3502:
3503: =back
3504:
3505: =cut
3506:
3507: sub hasResource {
3508: my $self = shift;
3509: return $self->{NAV_MAP}->hasResource(@_);
3510: }
3511:
3512: sub retrieveResources {
3513: my $self = shift;
3514: return $self->{NAV_MAP}->retrieveResources(@_);
3515: }
3516:
3517: sub is_exam {
3518: my ($self,$part) = @_;
3519: if ($self->parmval('type',$part) eq 'exam') {
3520: return 1;
3521: }
3522: if ($self->src() =~ /\.(exam)$/) {
3523: return 1;
3524: }
3525: return 0;
3526: }
3527: sub is_html {
3528: my $self=shift;
3529: my $src = $self->src();
3530: return ($src =~ /html$/);
3531: }
3532: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3533: sub is_page {
3534: my $self=shift;
3535: my $src = $self->src();
3536: return $self->navHash("is_map_", 1) &&
3537: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3538: }
3539: sub is_practice {
3540: my $self=shift;
3541: my ($part) = @_;
3542: if ($self->parmval('type',$part) eq 'practice') {
3543: return 1;
3544: }
3545: return 0;
3546: }
3547: sub is_problem {
3548: my $self=shift;
3549: my $src = $self->src();
3550: if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
3551: return !($self->is_practice());
3552: }
3553: return 0;
3554: }
3555: sub contains_problem {
3556: my $self=shift;
3557: if ($self->is_page()) {
3558: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3559: return $hasProblem;
3560: }
3561: return 0;
3562: }
3563: sub is_sequence {
3564: my $self=shift;
3565: return $self->navHash("is_map_", 1) &&
3566: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3567: }
3568: sub is_survey {
3569: my $self = shift();
3570: my $part = shift();
3571: if ($self->parmval('type',$part) eq 'survey') {
3572: return 1;
3573: }
3574: if ($self->src() =~ /\.(survey)$/) {
3575: return 1;
3576: }
3577: return 0;
3578: }
3579: sub is_task {
3580: my $self=shift;
3581: my $src = $self->src();
3582: return ($src =~ /\.(task)$/)
3583: }
3584:
3585: sub is_empty_sequence {
3586: my $self=shift;
3587: my $src = $self->src();
3588: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3589: }
3590:
3591: # Private method: Shells out to the parmval in the nav map, handler parts.
3592: sub parmval {
3593: my $self = shift;
3594: my $what = shift;
3595: my $part = shift;
3596: if (!defined($part)) {
3597: $part = '0';
3598: }
3599: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3600: }
3601:
3602: =pod
3603:
3604: B<Map Methods>
3605:
3606: These methods are useful for getting information about the map
3607: properties of the resource, if the resource is a map (B<is_map>).
3608:
3609: =over 4
3610:
3611: =item * B<map_finish>:
3612:
3613: Returns a reference to a resource object corresponding to the finish
3614: resource of the map.
3615:
3616: =item * B<map_pc>:
3617:
3618: Returns the pc value of the map, which is the first number that
3619: appears in the resource ID of the resources in the map, and is the
3620: number that appears around the middle of the symbs of the resources in
3621: that map.
3622:
3623: =item * B<map_start>:
3624:
3625: Returns a reference to a resource object corresponding to the start
3626: resource of the map.
3627:
3628: =item * B<map_type>:
3629:
3630: Returns a string with the type of the map in it.
3631:
3632: =back
3633:
3634: =cut
3635:
3636: sub map_finish {
3637: my $self = shift;
3638: my $src = $self->src();
3639: $src = &Apache::lonnet::clutter($src);
3640: my $res = $self->navHash("map_finish_$src", 0);
3641: $res = $self->{NAV_MAP}->getById($res);
3642: return $res;
3643: }
3644: sub map_pc {
3645: my $self = shift;
3646: my $src = $self->src();
3647: return $self->navHash("map_pc_$src", 0);
3648: }
3649: sub map_start {
3650: my $self = shift;
3651: my $src = $self->src();
3652: $src = &Apache::lonnet::clutter($src);
3653: my $res = $self->navHash("map_start_$src", 0);
3654: $res = $self->{NAV_MAP}->getById($res);
3655: return $res;
3656: }
3657: sub map_type {
3658: my $self = shift;
3659: my $pc = $self->map_pc();
3660: return $self->navHash("map_type_$pc", 0);
3661: }
3662:
3663: #####
3664: # Property queries
3665: #####
3666:
3667: # These functions will be responsible for returning the CORRECT
3668: # VALUE for the parameter, no matter what. So while they may look
3669: # like direct calls to parmval, they can be more than that.
3670: # So, for instance, the duedate function should use the "duedatetype"
3671: # information, rather than the resource object user.
3672:
3673: =pod
3674:
3675: =head2 Resource Parameters
3676:
3677: In order to use the resource parameters correctly, the nav map must
3678: have been instantiated with genCourseAndUserOptions set to true, so
3679: the courseopt and useropt is read correctly. Then, you can call these
3680: functions to get the relevant parameters for the resource. Each
3681: function defaults to part "0", but can be directed to another part by
3682: passing the part as the parameter.
3683:
3684: These methods are responsible for getting the parameter correct, not
3685: merely reflecting the contents of the GDBM hashes. As we move towards
3686: dates relative to other dates, these methods should be updated to
3687: reflect that. (Then, anybody using these methods will not have to update
3688: their code.)
3689:
3690: =over 4
3691:
3692: =item * B<acc>:
3693:
3694: Get the Client IP/Name Access Control information.
3695:
3696: =item * B<answerdate>:
3697:
3698: Get the answer-reveal date for the problem.
3699:
3700: =item * B<awarded>:
3701:
3702: Gets the awarded value for the problem part. Requires genUserData set to
3703: true when the navmap object was created.
3704:
3705: =item * B<duedate>:
3706:
3707: Get the due date for the problem.
3708:
3709: =item * B<tries>:
3710:
3711: Get the number of tries the student has used on the problem.
3712:
3713: =item * B<maxtries>:
3714:
3715: Get the number of max tries allowed.
3716:
3717: =item * B<opendate>:
3718:
3719: Get the open date for the problem.
3720:
3721: =item * B<sig>:
3722:
3723: Get the significant figures setting.
3724:
3725: =item * B<tol>:
3726:
3727: Get the tolerance for the problem.
3728:
3729: =item * B<tries>:
3730:
3731: Get the number of tries the user has already used on the problem.
3732:
3733: =item * B<type>:
3734:
3735: Get the question type for the problem.
3736:
3737: =item * B<weight>:
3738:
3739: Get the weight for the problem.
3740:
3741: =back
3742:
3743: =cut
3744:
3745: sub acc {
3746: (my $self, my $part) = @_;
3747: return $self->parmval("acc", $part);
3748: }
3749: sub answerdate {
3750: (my $self, my $part) = @_;
3751: # Handle intervals
3752: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3753: return $self->duedate($part) +
3754: $self->parmval("answerdate", $part);
3755: }
3756: return $self->parmval("answerdate", $part);
3757: }
3758: sub awarded {
3759: my $self = shift; my $part = shift;
3760: $self->{NAV_MAP}->get_user_data();
3761: if (!defined($part)) { $part = '0'; }
3762: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3763: }
3764: # this should work exactly like the copy in lonhomework.pm
3765: sub duedate {
3766: (my $self, my $part) = @_;
3767: my $date;
3768: my $interval=$self->parmval("interval", $part);
3769: my $due_date=$self->parmval("duedate", $part);
3770: if ($interval =~ /\d+/) {
3771: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3772: if (defined($first_access)) {
3773: $interval = $first_access+$interval;
3774: $date = ($interval < $due_date)? $interval : $due_date;
3775: } else {
3776: $date = $due_date;
3777: }
3778: } else {
3779: $date = $due_date;
3780: }
3781: return $date;
3782: }
3783: sub handgrade {
3784: (my $self, my $part) = @_;
3785: my @response_ids = $self->responseIds($part);
3786: if (@response_ids) {
3787: foreach my $response_id (@response_ids) {
3788: if (lc($self->parmval("handgrade",$part.'_'.$response_id))
3789: eq 'yes') {
3790: return 'yes';
3791: }
3792: }
3793: }
3794: return $self->parmval("handgrade", $part);
3795: }
3796: sub maxtries {
3797: (my $self, my $part) = @_;
3798: return $self->parmval("maxtries", $part);
3799: }
3800: sub opendate {
3801: (my $self, my $part) = @_;
3802: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3803: return $self->duedate($part) -
3804: $self->parmval("opendate", $part);
3805: }
3806: return $self->parmval("opendate");
3807: }
3808: sub problemstatus {
3809: (my $self, my $part) = @_;
3810: return lc $self->parmval("problemstatus", $part);
3811: }
3812: sub sig {
3813: (my $self, my $part) = @_;
3814: return $self->parmval("sig", $part);
3815: }
3816: sub tol {
3817: (my $self, my $part) = @_;
3818: return $self->parmval("tol", $part);
3819: }
3820: sub tries {
3821: my $self = shift;
3822: my $tries = $self->queryRestoreHash('tries', shift);
3823: if (!defined($tries)) { return '0';}
3824: return $tries;
3825: }
3826: sub type {
3827: (my $self, my $part) = @_;
3828: return $self->parmval("type", $part);
3829: }
3830: sub weight {
3831: my $self = shift; my $part = shift;
3832: if (!defined($part)) { $part = '0'; }
3833: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3834: $self->symb(), $env{'user.domain'},
3835: $env{'user.name'},
3836: $env{'request.course.sec'});
3837: }
3838: sub part_display {
3839: my $self= shift(); my $partID = shift();
3840: if (! defined($partID)) { $partID = '0'; }
3841: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3842: $self->symb);
3843: if (! defined($display) || $display eq '') {
3844: $display = $partID;
3845: }
3846: return $display;
3847: }
3848:
3849: # Multiple things need this
3850: sub getReturnHash {
3851: my $self = shift;
3852:
3853: if (!defined($self->{RETURN_HASH})) {
3854: my %tmpHash = &Apache::lonnet::restore($self->symb());
3855: $self->{RETURN_HASH} = \%tmpHash;
3856: }
3857: }
3858:
3859: ######
3860: # Status queries
3861: ######
3862:
3863: # These methods query the status of problems.
3864:
3865: # If we need to count parts, this function determines the number of
3866: # parts from the metadata. When called, it returns a reference to a list
3867: # of strings corresponding to the parts. (Thus, using it in a scalar context
3868: # tells you how many parts you have in the problem:
3869: # $partcount = scalar($resource->countParts());
3870: # Don't use $self->{PARTS} directly because you don't know if it's been
3871: # computed yet.
3872:
3873: =pod
3874:
3875: =head2 Resource misc
3876:
3877: Misc. functions for the resource.
3878:
3879: =over 4
3880:
3881: =item * B<hasDiscussion>:
3882:
3883: Returns a false value if there has been discussion since the user last
3884: logged in, true if there has. Always returns false if the discussion
3885: data was not extracted when the nav map was constructed.
3886:
3887: =item * B<last_post_time>:
3888:
3889: Returns a false value if there hasn't been discussion otherwise returns
3890: unix timestamp of last time a discussion posting (or edit) was made.
3891:
3892: =item * B<discussion_info>:
3893:
3894: optional argument is a filter (currently can be 'unread');
3895: returns in scalar context the count of the number of discussion postings.
3896:
3897: returns in list context both the count of postings and a hash ref
3898: containing information about the postings (subject, id, timestamp) in a hash.
3899:
3900: Default is to return counts for all postings. However if called with a second argument set to 'unread', will return information about only unread postings.
3901:
3902: =item * B<getFeedback>:
3903:
3904: Gets the feedback for the resource and returns the raw feedback string
3905: for the resource, or the null string if there is no feedback or the
3906: email data was not extracted when the nav map was constructed. Usually
3907: used like this:
3908:
3909: for my $url (split(/\,/, $res->getFeedback())) {
3910: my $link = &escape($url);
3911: ...
3912:
3913: and use the link as appropriate.
3914:
3915: =cut
3916:
3917: sub hasDiscussion {
3918: my $self = shift;
3919: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3920: }
3921:
3922: sub last_post_time {
3923: my $self = shift;
3924: return $self->{NAV_MAP}->last_post_time($self->symb());
3925: }
3926:
3927: sub discussion_info {
3928: my ($self,$filter) = @_;
3929: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
3930: }
3931:
3932: sub getFeedback {
3933: my $self = shift;
3934: my $source = $self->src();
3935: my $symb = $self->symb();
3936: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3937: return $self->{NAV_MAP}->getFeedback($symb,$source);
3938: }
3939:
3940: sub getErrors {
3941: my $self = shift;
3942: my $source = $self->src();
3943: my $symb = $self->symb();
3944: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3945: return $self->{NAV_MAP}->getErrors($symb,$source);
3946: }
3947:
3948: =pod
3949:
3950: =item * B<parts>():
3951:
3952: Returns a list reference containing sorted strings corresponding to
3953: each part of the problem. Single part problems have only a part '0'.
3954: Multipart problems do not return their part '0', since they typically
3955: do not really matter.
3956:
3957: =item * B<countParts>():
3958:
3959: Returns the number of parts of the problem a student can answer. Thus,
3960: for single part problems, returns 1. For multipart, it returns the
3961: number of parts in the problem, not including psuedo-part 0.
3962:
3963: =item * B<countResponses>():
3964:
3965: Returns the total number of responses in the problem a student can answer.
3966:
3967: =item * B<responseTypes>():
3968:
3969: Returns a hash whose keys are the response types. The values are the number
3970: of times each response type is used. This is for the I<entire> problem, not
3971: just a single part.
3972:
3973: =item * B<multipart>():
3974:
3975: Returns true if the problem is multipart, false otherwise. Use this instead
3976: of countParts if all you want is multipart/not multipart.
3977:
3978: =item * B<responseType>($part):
3979:
3980: Returns the response type of the part, without the word "response" on the
3981: end. Example return values: 'string', 'essay', 'numeric', etc.
3982:
3983: =item * B<responseIds>($part):
3984:
3985: Retreives the response IDs for the given part as an array reference containing
3986: strings naming the response IDs. This may be empty.
3987:
3988: =back
3989:
3990: =cut
3991:
3992: sub parts {
3993: my $self = shift;
3994:
3995: if ($self->ext) { return []; }
3996:
3997: $self->extractParts();
3998: return $self->{PARTS};
3999: }
4000:
4001: sub countParts {
4002: my $self = shift;
4003:
4004: my $parts = $self->parts();
4005:
4006: # If I left this here, then it's not necessary.
4007: #my $delta = 0;
4008: #for my $part (@$parts) {
4009: # if ($part eq '0') { $delta--; }
4010: #}
4011:
4012: if ($self->{RESOURCE_ERROR}) {
4013: return 0;
4014: }
4015:
4016: return scalar(@{$parts}); # + $delta;
4017: }
4018:
4019: sub countResponses {
4020: my $self = shift;
4021: my $count;
4022: foreach my $part (@{$self->parts()}) {
4023: $count+= scalar($self->responseIds($part));
4024: }
4025: return $count;
4026: }
4027:
4028: sub responseTypes {
4029: my $self = shift;
4030: my %responses;
4031: foreach my $part (@{$self->parts()}) {
4032: foreach my $responsetype ($self->responseType($part)) {
4033: $responses{$responsetype}++ if (defined($responsetype));
4034: }
4035: }
4036: return %responses;
4037: }
4038:
4039: sub multipart {
4040: my $self = shift;
4041: return $self->countParts() > 1;
4042: }
4043:
4044: sub singlepart {
4045: my $self = shift;
4046: return $self->countParts() == 1;
4047: }
4048:
4049: sub responseType {
4050: my $self = shift;
4051: my $part = shift;
4052:
4053: $self->extractParts();
4054: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4055: return @{$self->{RESPONSE_TYPES}->{$part}};
4056: } else {
4057: return undef;
4058: }
4059: }
4060:
4061: sub responseIds {
4062: my $self = shift;
4063: my $part = shift;
4064:
4065: $self->extractParts();
4066: if (defined($self->{RESPONSE_IDS}->{$part})) {
4067: return @{$self->{RESPONSE_IDS}->{$part}};
4068: } else {
4069: return undef;
4070: }
4071: }
4072:
4073: # Private function: Extracts the parts information, both part names and
4074: # part types, and saves it.
4075: sub extractParts {
4076: my $self = shift;
4077:
4078: return if (defined($self->{PARTS}));
4079: return if ($self->ext);
4080:
4081: $self->{PARTS} = [];
4082:
4083: my %parts;
4084:
4085: # Retrieve part count, if this is a problem
4086: if ($self->is_problem()) {
4087: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4088: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4089:
4090: if ($partorder) {
4091: my @parts;
4092: for my $part (split (/,/,$partorder)) {
4093: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4094: push @parts, $part;
4095: $parts{$part} = 1;
4096: }
4097: }
4098: $self->{PARTS} = \@parts;
4099: } else {
4100: if (!$metadata) {
4101: $self->{RESOURCE_ERROR} = 1;
4102: $self->{PARTS} = [];
4103: $self->{PART_TYPE} = {};
4104: return;
4105: }
4106: foreach my $entry (split(/\,/,$metadata)) {
4107: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4108: my $part = $1;
4109: # This floods the logs if it blows up
4110: if (defined($parts{$part})) {
4111: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4112: }
4113:
4114: # check to see if part is turned off.
4115:
4116: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4117: $parts{$part} = 1;
4118: }
4119: }
4120: }
4121: my @sortedParts = sort keys %parts;
4122: $self->{PARTS} = \@sortedParts;
4123: }
4124:
4125:
4126: # These hashes probably do not need names that end with "Hash"....
4127: my %responseIdHash;
4128: my %responseTypeHash;
4129:
4130:
4131: # Init the responseIdHash
4132: foreach my $part (@{$self->{PARTS}}) {
4133: $responseIdHash{$part} = [];
4134: }
4135:
4136: # Now, the unfortunate thing about this is that parts, part name, and
4137: # response id are delimited by underscores, but both the part
4138: # name and response id can themselves have underscores in them.
4139: # So we have to use our knowlege of part names to figure out
4140: # where the part names begin and end, and even then, it is possible
4141: # to construct ambiguous situations.
4142: foreach my $data (split /,/, $metadata) {
4143: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4144: || $data =~ /^(Task)_(.*)/) {
4145: my $responseType = $1;
4146: my $partStuff = $2;
4147: my $partIdSoFar = '';
4148: my @partChunks = split /_/, $partStuff;
4149: my $i = 0;
4150: for ($i = 0; $i < scalar(@partChunks); $i++) {
4151: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4152: $partIdSoFar .= $partChunks[$i];
4153: if ($parts{$partIdSoFar}) {
4154: my @otherChunks = @partChunks[$i+1..$#partChunks];
4155: my $responseId = join('_', @otherChunks);
4156: if ($self->is_task()) {
4157: push(@{$responseIdHash{$partIdSoFar}},
4158: $partIdSoFar);
4159: } else {
4160: push(@{$responseIdHash{$partIdSoFar}},
4161: $responseId);
4162: }
4163: push(@{$responseTypeHash{$partIdSoFar}},
4164: $responseType);
4165: }
4166: }
4167: }
4168: }
4169: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4170: #
4171: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4172: if ($resorder) {
4173: my @resorder=split(/,/,$resorder);
4174: foreach my $part (keys(%responseIdHash)) {
4175: my $i=0;
4176: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4177: my @neworder;
4178: foreach my $possibleid (@resorder) {
4179: if (exists($resids{$possibleid})) {
4180: push(@neworder,$resids{$possibleid});
4181: }
4182: }
4183: my @ids;
4184: my @type;
4185: foreach my $element (@neworder) {
4186: push (@ids,$responseIdHash{$part}->[$element]);
4187: push (@type,$responseTypeHash{$part}->[$element]);
4188: }
4189: $responseIdHash{$part}=\@ids;
4190: $responseTypeHash{$part}=\@type;
4191: }
4192: }
4193: $self->{RESPONSE_IDS} = \%responseIdHash;
4194: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4195: }
4196:
4197: return;
4198: }
4199:
4200: =pod
4201:
4202: =head2 Resource Status
4203:
4204: Problem resources have status information, reflecting their various
4205: dates and completion statuses.
4206:
4207: There are two aspects to the status: the date-related information and
4208: the completion information.
4209:
4210: Idiomatic usage of these two methods would probably look something
4211: like
4212:
4213: foreach my $part ($resource->parts()) {
4214: my $dateStatus = $resource->getDateStatus($part);
4215: my $completionStatus = $resource->getCompletionStatus($part);
4216:
4217: or
4218:
4219: my $status = $resource->status($part);
4220:
4221: ... use it here ...
4222: }
4223:
4224: Which you use depends on exactly what you are looking for. The
4225: status() function has been optimized for the nav maps display and may
4226: not precisely match what you need elsewhere.
4227:
4228: The symbolic constants shown below can be accessed through the
4229: resource object: C<$res->OPEN>.
4230:
4231: =over 4
4232:
4233: =item * B<getDateStatus>($part):
4234:
4235: ($part defaults to 0). A convenience function that returns a symbolic
4236: constant telling you about the date status of the part. The possible
4237: return values are:
4238:
4239: =back
4240:
4241: B<Date Codes>
4242:
4243: =over 4
4244:
4245: =item * B<OPEN_LATER>:
4246:
4247: The problem will be opened later.
4248:
4249: =item * B<OPEN>:
4250:
4251: Open and not yet due.
4252:
4253:
4254: =item * B<PAST_DUE_ANSWER_LATER>:
4255:
4256: The due date has passed, but the answer date has not yet arrived.
4257:
4258: =item * B<PAST_DUE_NO_ANSWER>:
4259:
4260: The due date has passed and there is no answer opening date set.
4261:
4262: =item * B<ANSWER_OPEN>:
4263:
4264: The answer date is here.
4265:
4266: =item * B<NETWORK_FAILURE>:
4267:
4268: The information is unknown due to network failure.
4269:
4270: =back
4271:
4272: =cut
4273:
4274: # Apparently the compiler optimizes these into constants automatically
4275: sub OPEN_LATER { return 0; }
4276: sub OPEN { return 1; }
4277: sub PAST_DUE_NO_ANSWER { return 2; }
4278: sub PAST_DUE_ANSWER_LATER { return 3; }
4279: sub ANSWER_OPEN { return 4; }
4280: sub NOTHING_SET { return 5; }
4281: sub NETWORK_FAILURE { return 100; }
4282:
4283: # getDateStatus gets the date status for a given problem part.
4284: # Because answer date, due date, and open date are fully independent
4285: # (i.e., it is perfectly possible to *only* have an answer date),
4286: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4287: # (past, future, none given). This function handles this with a decision
4288: # tree. Read the comments to follow the decision tree.
4289:
4290: sub getDateStatus {
4291: my $self = shift;
4292: my $part = shift;
4293: $part = "0" if (!defined($part));
4294:
4295: # Always return network failure if there was one.
4296: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4297:
4298: my $now = time();
4299:
4300: my $open = $self->opendate($part);
4301: my $due = $self->duedate($part);
4302: my $answer = $self->answerdate($part);
4303:
4304: if (!$open && !$due && !$answer) {
4305: # no data on the problem at all
4306: # should this be the same as "open later"? think multipart.
4307: return $self->NOTHING_SET;
4308: }
4309: if (!$open || $now < $open) {return $self->OPEN_LATER}
4310: if (!$due || $now < $due) {return $self->OPEN}
4311: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4312: if ($answer) { return $self->ANSWER_OPEN; }
4313: return PAST_DUE_NO_ANSWER;
4314: }
4315:
4316: =pod
4317:
4318: B<>
4319:
4320: =over 4
4321:
4322: =item * B<getCompletionStatus>($part):
4323:
4324: ($part defaults to 0.) A convenience function that returns a symbolic
4325: constant telling you about the completion status of the part, with the
4326: following possible results:
4327:
4328: =back
4329:
4330: B<Completion Codes>
4331:
4332: =over 4
4333:
4334: =item * B<NOT_ATTEMPTED>:
4335:
4336: Has not been attempted at all.
4337:
4338: =item * B<INCORRECT>:
4339:
4340: Attempted, but wrong by student.
4341:
4342: =item * B<INCORRECT_BY_OVERRIDE>:
4343:
4344: Attempted, but wrong by instructor override.
4345:
4346: =item * B<CORRECT>:
4347:
4348: Correct or correct by instructor.
4349:
4350: =item * B<CORRECT_BY_OVERRIDE>:
4351:
4352: Correct by instructor override.
4353:
4354: =item * B<EXCUSED>:
4355:
4356: Excused. Not yet implemented.
4357:
4358: =item * B<NETWORK_FAILURE>:
4359:
4360: Information not available due to network failure.
4361:
4362: =item * B<ATTEMPTED>:
4363:
4364: Attempted, and not yet graded.
4365:
4366: =back
4367:
4368: =cut
4369:
4370: sub NOT_ATTEMPTED { return 10; }
4371: sub INCORRECT { return 11; }
4372: sub INCORRECT_BY_OVERRIDE { return 12; }
4373: sub CORRECT { return 13; }
4374: sub CORRECT_BY_OVERRIDE { return 14; }
4375: sub EXCUSED { return 15; }
4376: sub ATTEMPTED { return 16; }
4377:
4378: sub getCompletionStatus {
4379: my $self = shift;
4380: my $part = shift;
4381: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4382:
4383: my $status = $self->queryRestoreHash('solved', $part);
4384:
4385: # Left as separate if statements in case we ever do more with this
4386: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4387: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4388: if ($status eq 'correct_by_override') {
4389: return $self->CORRECT_BY_OVERRIDE;
4390: }
4391: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4392: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4393: if ($status eq 'excused') {return $self->EXCUSED; }
4394: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4395: return $self->NOT_ATTEMPTED;
4396: }
4397:
4398: sub queryRestoreHash {
4399: my $self = shift;
4400: my $hashentry = shift;
4401: my $part = shift;
4402: $part = "0" if (!defined($part) || $part eq '');
4403: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4404:
4405: $self->getReturnHash();
4406:
4407: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4408: }
4409:
4410: =pod
4411:
4412: B<Composite Status>
4413:
4414: Along with directly returning the date or completion status, the
4415: resource object includes a convenience function B<status>() that will
4416: combine the two status tidbits into one composite status that can
4417: represent the status of the resource as a whole. This method represents
4418: the concept of the thing we want to display to the user on the nav maps
4419: screen, which is a combination of completion and open status. The precise logic is
4420: documented in the comments of the status method. The following results
4421: may be returned, all available as methods on the resource object
4422: ($res->NETWORK_FAILURE): In addition to the return values that match
4423: the date or completion status, this function can return "ANSWER_SUBMITTED"
4424: if that problemstatus parameter value is set to No, suppressing the
4425: incorrect/correct feedback.
4426:
4427: =over 4
4428:
4429: =item * B<NETWORK_FAILURE>:
4430:
4431: The network has failed and the information is not available.
4432:
4433: =item * B<NOTHING_SET>:
4434:
4435: No dates have been set for this problem (part) at all. (Because only
4436: certain parts of a multi-part problem may be assigned, this can not be
4437: collapsed into "open later", as we do not know a given part will EVER
4438: be opened. For single part, this is the same as "OPEN_LATER".)
4439:
4440: =item * B<CORRECT>:
4441:
4442: For any reason at all, the part is considered correct.
4443:
4444: =item * B<EXCUSED>:
4445:
4446: For any reason at all, the problem is excused.
4447:
4448: =item * B<PAST_DUE_NO_ANSWER>:
4449:
4450: The problem is past due, not considered correct, and no answer date is
4451: set.
4452:
4453: =item * B<PAST_DUE_ANSWER_LATER>:
4454:
4455: The problem is past due, not considered correct, and an answer date in
4456: the future is set.
4457:
4458: =item * B<ANSWER_OPEN>:
4459:
4460: The problem is past due, not correct, and the answer is now available.
4461:
4462: =item * B<OPEN_LATER>:
4463:
4464: The problem is not yet open.
4465:
4466: =item * B<TRIES_LEFT>:
4467:
4468: The problem is open, has been tried, is not correct, but there are
4469: tries left.
4470:
4471: =item * B<INCORRECT>:
4472:
4473: The problem is open, and all tries have been used without getting the
4474: correct answer.
4475:
4476: =item * B<OPEN>:
4477:
4478: The item is open and not yet tried.
4479:
4480: =item * B<ATTEMPTED>:
4481:
4482: The problem has been attempted.
4483:
4484: =item * B<ANSWER_SUBMITTED>:
4485:
4486: An answer has been submitted, but the student should not see it.
4487:
4488: =back
4489:
4490: =cut
4491:
4492: sub TRIES_LEFT { return 20; }
4493: sub ANSWER_SUBMITTED { return 21; }
4494: sub PARTIALLY_CORRECT{ return 22; }
4495:
4496: sub status {
4497: my $self = shift;
4498: my $part = shift;
4499: if (!defined($part)) { $part = "0"; }
4500: my $completionStatus = $self->getCompletionStatus($part);
4501: my $dateStatus = $self->getDateStatus($part);
4502:
4503: # What we have is a two-dimensional matrix with 4 entries on one
4504: # dimension and 5 entries on the other, which we want to colorize,
4505: # plus network failure and "no date data at all".
4506:
4507: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4508: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4509:
4510: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4511: # If there's an answer date and we're past it, don't
4512: # suppress the feedback; student should know
4513: if ($self->duedate($part) && $self->duedate($part) < time() &&
4514: $self->answerdate($part) && $self->answerdate($part) < time()) {
4515: $suppressFeedback = 0;
4516: }
4517:
4518: # There are a few whole rows we can dispose of:
4519: if ($completionStatus == CORRECT ||
4520: $completionStatus == CORRECT_BY_OVERRIDE ) {
4521: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4522: my $awarded=$self->awarded($part);
4523: if ($awarded < 1 && $awarded > 0) {
4524: return PARTIALLY_CORRECT;
4525: } elsif ($awarded<1) {
4526: return INCORRECT;
4527: }
4528: return CORRECT;
4529: }
4530:
4531: # If it's WRONG... and not open
4532: if ( ($completionStatus == INCORRECT ||
4533: $completionStatus == INCORRECT_BY_OVERRIDE)
4534: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
4535: return INCORRECT;
4536: }
4537:
4538: if ($completionStatus == ATTEMPTED) {
4539: return ATTEMPTED;
4540: }
4541:
4542: # If it's EXCUSED, then return that no matter what
4543: if ($completionStatus == EXCUSED) {
4544: return EXCUSED;
4545: }
4546:
4547: if ($dateStatus == NOTHING_SET) {
4548: return NOTHING_SET;
4549: }
4550:
4551: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4552: # by 4 matrix (date statuses).
4553:
4554: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4555: $dateStatus == PAST_DUE_NO_ANSWER ) {
4556: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4557: }
4558:
4559: if ($dateStatus == ANSWER_OPEN) {
4560: return ANSWER_OPEN;
4561: }
4562:
4563: # Now: (incorrect, incorrect_override, not_attempted) x
4564: # (open_later), (open)
4565:
4566: if ($dateStatus == OPEN_LATER) {
4567: return OPEN_LATER;
4568: }
4569:
4570: # If it's WRONG...
4571: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4572: # and there are TRIES LEFT:
4573: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4574: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4575: }
4576: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4577: }
4578:
4579: # Otherwise, it's untried and open
4580: return OPEN;
4581: }
4582:
4583: sub CLOSED { return 23; }
4584: sub ERROR { return 24; }
4585:
4586: =pod
4587:
4588: B<Simple Status>
4589:
4590: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4591: "Simple status" corresponds to "which icon is shown on the
4592: Navmaps". There are six "simple" statuses:
4593:
4594: =over 4
4595:
4596: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4597:
4598: =item * B<OPEN>: The problem is open and unattempted.
4599:
4600: =item * B<CORRECT>: The problem is correct for any reason.
4601:
4602: =item * B<INCORRECT>: The problem is incorrect and can still be
4603: completed successfully.
4604:
4605: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4606: does not know if they are correct. (The ellipsis icon.)
4607:
4608: =item * B<ERROR>: There is an error retrieving information about this
4609: problem.
4610:
4611: =back
4612:
4613: =cut
4614:
4615: # This hash maps the composite status to this simple status, and
4616: # can be used directly, if you like
4617: my %compositeToSimple =
4618: (
4619: NETWORK_FAILURE() => ERROR,
4620: NOTHING_SET() => CLOSED,
4621: CORRECT() => CORRECT,
4622: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4623: EXCUSED() => CORRECT,
4624: PAST_DUE_NO_ANSWER() => INCORRECT,
4625: PAST_DUE_ANSWER_LATER() => INCORRECT,
4626: ANSWER_OPEN() => INCORRECT,
4627: OPEN_LATER() => CLOSED,
4628: TRIES_LEFT() => OPEN,
4629: INCORRECT() => INCORRECT,
4630: OPEN() => OPEN,
4631: ATTEMPTED() => ATTEMPTED,
4632: ANSWER_SUBMITTED() => ATTEMPTED
4633: );
4634:
4635: sub simpleStatus {
4636: my $self = shift;
4637: my $part = shift;
4638: my $status = $self->status($part);
4639: return $compositeToSimple{$status};
4640: }
4641:
4642: =pod
4643:
4644: B<simpleStatusCount> will return an array reference containing, in
4645: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4646: and ERROR parts the given problem has.
4647:
4648: =cut
4649:
4650: # This maps the status to the slot we want to increment
4651: my %statusToSlotMap =
4652: (
4653: OPEN() => 0,
4654: CLOSED() => 1,
4655: CORRECT() => 2,
4656: INCORRECT() => 3,
4657: ATTEMPTED() => 4,
4658: ERROR() => 5
4659: );
4660:
4661: sub statusToSlot { return $statusToSlotMap{shift()}; }
4662:
4663: sub simpleStatusCount {
4664: my $self = shift;
4665:
4666: my @counts = (0, 0, 0, 0, 0, 0, 0);
4667: foreach my $part (@{$self->parts()}) {
4668: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4669: }
4670:
4671: return \@counts;
4672: }
4673:
4674: =pod
4675:
4676: B<Completable>
4677:
4678: The completable method represents the concept of I<whether the student can
4679: currently do the problem>. If the student can do the problem, which means
4680: that it is open, there are tries left, and if the problem is manually graded
4681: or the grade is suppressed via problemstatus, the student has not tried it
4682: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4683: either the student has tried it and there is no feedback, or that for
4684: some reason it is no longer completable (not open yet, successfully completed,
4685: out of tries, etc.). As an example, this is used as the filter for the
4686: "Uncompleted Homework" option for the nav maps.
4687:
4688: If this does not quite meet your needs, do not fiddle with it (unless you are
4689: fixing it to better match the student's conception of "completable" because
4690: it's broken somehow)... make a new method.
4691:
4692: =cut
4693:
4694: sub completable {
4695: my $self = shift;
4696: if (!$self->is_problem()) { return 0; }
4697: my $partCount = $self->countParts();
4698:
4699: foreach my $part (@{$self->parts()}) {
4700: if ($part eq '0' && $partCount != 1) { next; }
4701: my $status = $self->status($part);
4702: # "If any of the parts are open, or have tries left (implies open),
4703: # and it is not "attempted" (manually graded problem), it is
4704: # not "complete"
4705: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4706: $status == ANSWER_SUBMITTED() ) {
4707: # did this part already, as well as we can
4708: next;
4709: }
4710: if ($status == OPEN() || $status == TRIES_LEFT()) {
4711: return 1;
4712: }
4713: }
4714:
4715: # If all the parts were complete, so was this problem.
4716: return 0;
4717: }
4718:
4719: =pod
4720:
4721: =head2 Resource/Nav Map Navigation
4722:
4723: =over 4
4724:
4725: =item * B<getNext>():
4726:
4727: Retreive an array of the possible next resources after this
4728: one. Always returns an array, even in the one- or zero-element case.
4729:
4730: =item * B<getPrevious>():
4731:
4732: Retreive an array of the possible previous resources from this
4733: one. Always returns an array, even in the one- or zero-element case.
4734:
4735: =cut
4736:
4737: sub getNext {
4738: my $self = shift;
4739: my @branches;
4740: my $to = $self->to();
4741: foreach my $branch ( split(/,/, $to) ) {
4742: my $choice = $self->{NAV_MAP}->getById($branch);
4743: #if (!$choice->condition()) { next; }
4744: my $next = $choice->goesto();
4745: $next = $self->{NAV_MAP}->getById($next);
4746:
4747: push @branches, $next;
4748: }
4749: return \@branches;
4750: }
4751:
4752: sub getPrevious {
4753: my $self = shift;
4754: my @branches;
4755: my $from = $self->from();
4756: foreach my $branch ( split /,/, $from) {
4757: my $choice = $self->{NAV_MAP}->getById($branch);
4758: my $prev = $choice->comesfrom();
4759: $prev = $self->{NAV_MAP}->getById($prev);
4760:
4761: push @branches, $prev;
4762: }
4763: return \@branches;
4764: }
4765:
4766: sub browsePriv {
4767: my $self = shift;
4768: if (defined($self->{BROWSE_PRIV})) {
4769: return $self->{BROWSE_PRIV};
4770: }
4771:
4772: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4773: $self->symb());
4774: }
4775:
4776: =pod
4777:
4778: =back
4779:
4780: =cut
4781:
4782: 1;
4783:
4784: __END__
4785:
4786:
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