1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.509.2.5.4.3 2018/04/29 16:16:05 raeburn Exp $
5:
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: ###
30:
31: =pod
32:
33: =head1 NAME
34:
35: Apache::lonnavmaps - Subroutines to handle and render the navigation
36:
37: =head1 SYNOPSIS
38:
39: Handles navigational maps.
40:
41: The main handler generates the navigational listing for the course,
42: the other objects export this information in a usable fashion for
43: other modules.
44:
45:
46: This is part of the LearningOnline Network with CAPA project
47: described at http://www.lon-capa.org.
48:
49:
50: =head1 OVERVIEW
51:
52: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
53: course structure and caches it in what is often referred to as the
54: "big hash" X<big hash>. You can see it if you are logged into
55: LON-CAPA, in a course, by going to /adm/test. (You may need to
56: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
57: content of the hash will be under the heading "Big Hash".
58:
59: Big Hash contains, among other things, how resources are related
60: to each other (next/previous), what resources are maps, which
61: resources are being chosen to not show to the student (for random
62: selection), and a lot of other things that can take a lot of time
63: to compute due to the amount of data that needs to be collected and
64: processed.
65:
66: Apache::lonnavmaps provides an object model for manipulating this
67: information in a higher-level fashion than directly manipulating
68: the hash. It also provides access to several auxilary functions
69: that aren't necessarily stored in the Big Hash, but are a per-
70: resource sort of value, like whether there is any feedback on
71: a given resource.
72:
73: Apache::lonnavmaps also abstracts away branching, and someday,
74: conditions, for the times where you don't really care about those
75: things.
76:
77: Apache::lonnavmaps also provides fairly powerful routines for
78: rendering navmaps, and last but not least, provides the navmaps
79: view for when the user clicks the NAV button.
80:
81: B<Note>: Apache::lonnavmaps I<only> works for the "currently
82: logged in user"; if you want things like "due dates for another
83: student" lonnavmaps can not directly retrieve information like
84: that. You need the EXT function. This module can still help,
85: because many things, such as the course structure, are constant
86: between users, and Apache::lonnavmaps can help by providing
87: symbs for the EXT call.
88:
89: The rest of this file will cover the provided rendering routines,
90: which can often be used without fiddling with the navmap object at
91: all, then documents the Apache::lonnavmaps::navmap object, which
92: is the key to accessing the Big Hash information, covers the use
93: of the Iterator (which provides the logic for traversing the
94: somewhat-complicated Big Hash data structure), documents the
95: Apache::lonnavmaps::Resource objects that are returned by
96:
97: =head1 Subroutine: render
98:
99: The navmap renderer package provides a sophisticated rendering of the
100: standard navigation maps interface into HTML. The provided nav map
101: handler is actually just a glorified call to this.
102:
103: Because of the large number of parameters this function accepts,
104: instead of passing it arguments as is normal, pass it in an anonymous
105: hash with the desired options.
106:
107: The package provides a function called 'render', called as
108: Apache::lonnavmaps::render({}).
109:
110: =head2 Overview of Columns
111:
112: The renderer will build an HTML table for the navmap and return
113: it. The table consists of several columns, and a row for each
114: resource (or possibly each part). You tell the renderer how many
115: columns to create and what to place in each column, optionally using
116: one or more of the prepared columns, and the renderer will assemble
117: the table.
118:
119: Any additional generally useful column types should be placed in the
120: renderer code here, so anybody can use it anywhere else. Any code
121: specific to the current application (such as the addition of <input>
122: elements in a column) should be placed in the code of the thing using
123: the renderer.
124:
125: At the core of the renderer is the array reference COLS (see Example
126: section below for how to pass this correctly). The COLS array will
127: consist of entries of one of two types of things: Either an integer
128: representing one of the pre-packaged column types, or a sub reference
129: that takes a resource reference, a part number, and a reference to the
130: argument hash passed to the renderer, and returns a string that will
131: be inserted into the HTML representation as it.
132:
133: All other parameters are ways of either changing how the columns
134: are printing, or which rows are shown.
135:
136: The pre-packaged column names are refered to by constants in the
137: Apache::lonnavmaps namespace. The following currently exist:
138:
139: =over 4
140:
141: =item * B<Apache::lonnavmaps::resource>:
142:
143: The general info about the resource: Link, icon for the type, etc. The
144: first column in the standard nav map display. This column provides the
145: indentation effect seen in the B<NAV> screen. This column also accepts
146: the following parameters in the renderer hash:
147:
148: =over 4
149:
150: =item * B<resource_nolink>: default false
151:
152: If true, the resource will not be linked. By default, all non-folder
153: resources are linked.
154:
155: =item * B<resource_part_count>: default true
156:
157: If true, the resource will show a part count B<if> the full
158: part list is not displayed. (See "condense_parts" later.) If false,
159: the resource will never show a part count.
160:
161: =item * B<resource_no_folder_link>:
162:
163: If true, the resource's folder will not be clickable to open or close
164: it. Default is false. True implies printCloseAll is false, since you
165: can't close or open folders when this is on anyhow.
166:
167: =item * B<map_no_edit_link>:
168:
169: If true, the title of the folder or page will not be followed by an
170: icon/link to direct editing of a folder or composite page, originally
171: added via the Course Editor.
172:
173: =back
174:
175: =item * B<Apache::lonnavmaps::communication_status>:
176:
177: Whether there is discussion on the resource, email for the user, or
178: (lumped in here) perl errors in the execution of the problem. This is
179: the second column in the main nav map.
180:
181: =item * B<Apache::lonnavmaps::quick_status>:
182:
183: An icon for the status of a problem, with five possible states:
184: Correct, incorrect, open, awaiting grading (for a problem where the
185: computer's grade is suppressed, or the computer can't grade, like
186: essay problem), or none (not open yet, not a problem). The
187: third column of the standard navmap.
188:
189: =item * B<Apache::lonnavmaps::long_status>:
190:
191: A text readout of the details of the current status of the problem,
192: such as "Due in 22 hours". The fourth column of the standard navmap.
193:
194: =item * B<Apache::lonnavmaps::part_status_summary>:
195:
196: A text readout summarizing the status of the problem. If it is a
197: single part problem, will display "Correct", "Incorrect",
198: "Not yet open", "Open", "Attempted", or "Error". If there are
199: multiple parts, this will output a string that in HTML will show a
200: status of how many parts are in each status, in color coding, trying
201: to match the colors of the icons within reason.
202:
203: Note this only makes sense if you are I<not> showing parts. If
204: C<showParts> is true (see below), this column will not output
205: anything.
206:
207: =back
208:
209: If you add any others please be sure to document them here.
210:
211: An example of a column renderer that will show the ID number of a
212: resource, along with the part name if any:
213:
214: sub {
215: my ($resource, $part, $params) = @_;
216: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
217: return '<td>' . $resource->{ID} . '</td>';
218: }
219:
220: Note these functions are responsible for the TD tags, which allow them
221: to override vertical and horizontal alignment, etc.
222:
223: =head2 Parameters
224:
225: Minimally, you should be
226: able to get away with just using 'cols' (to specify the columns
227: shown), 'url' (necessary for the folders to link to the current screen
228: correctly), and possibly 'queryString' if your app calls for it. In
229: that case, maintaining the state of the folders will be done
230: automatically.
231:
232: =over 4
233:
234: =item * B<iterator>: default: constructs one from %env
235:
236: A reference to a fresh ::iterator to use from the navmaps. The
237: rendering will reflect the options passed to the iterator, so you can
238: use that to just render a certain part of the course, if you like. If
239: one is not passed, the renderer will attempt to construct one from
240: env{'form.filter'} and env{'form.condition'} information, plus the
241: 'iterator_map' parameter if any.
242:
243: =item * B<iterator_map>: default: not used
244:
245: If you are letting the renderer do the iterator handling, you can
246: instruct the renderer to render only a particular map by passing it
247: the source of the map you want to process, like
248: '/res/103/jerf/navmap.course.sequence'.
249:
250: =item * B<include_top_level_map>: default: false
251:
252: If you need to include the top level map (meaning the course) in the
253: rendered output set this to true
254:
255: =item * B<navmap>: default: constructs one from %env
256:
257: A reference to a navmap, used only if an iterator is not passed in. If
258: this is necessary to make an iterator but it is not passed in, a new
259: one will be constructed based on env info. This is useful to do basic
260: error checking before passing it off to render.
261:
262: =item * B<r>: default: must be passed in
263:
264: The standard Apache response object. This must be passed to the
265: renderer or the course hash will be locked.
266:
267: =item * B<cols>: default: empty (useless)
268:
269: An array reference
270:
271: =item * B<showParts>:default true
272:
273: A flag. If true, a line for the resource itself, and a line
274: for each part will be displayed. If not, only one line for each
275: resource will be displayed.
276:
277: =item * B<condenseParts>: default true
278:
279: A flag. If true, if all parts of the problem have the same
280: status and that status is Nothing Set, Correct, or Network Failure,
281: then only one line will be displayed for that resource anyhow. If no,
282: all parts will always be displayed. If showParts is 0, this is
283: ignored.
284:
285: =item * B<jumpCount>: default: determined from %env
286:
287: A string identifying the URL to place the anchor 'curloc' at.
288: It is the responsibility of the renderer user to
289: ensure that the #curloc is in the URL. By default, determined through
290: the use of the env{} 'jump' information, and should normally "just
291: work" correctly.
292:
293: =item * B<here>: default: empty string
294:
295: A Symb identifying where to place the 'here' marker. The empty
296: string means no marker.
297:
298: =item * B<indentString>: default: 25 pixel whitespace image
299:
300: A string identifying the indentation string to use.
301:
302: =item * B<queryString>: default: empty
303:
304: A string which will be prepended to the query string used when the
305: folders are opened or closed. You can use this to pass
306: application-specific values.
307:
308: =item * B<url>: default: none
309:
310: The url the folders will link to, which should be the current
311: page. Required if the resource info column is shown, and you
312: are allowing the user to open and close folders.
313:
314: =item * B<currentJumpIndex>: default: no jumping
315:
316: Describes the currently-open row number to cause the browser to jump
317: to, because the user just opened that folder. By default, pulled from
318: the Jump information in the env{'form.*'}.
319:
320: =item * B<printKey>: default: false
321:
322: If true, print the key that appears on the top of the standard
323: navmaps.
324:
325: =item * B<printCloseAll>: default: true
326:
327: If true, print the "Close all folders" or "open all folders"
328: links.
329:
330: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
331:
332: A function that takes the resource object as its only parameter and
333: returns a true or false value. If true, the resource is displayed. If
334: false, it is simply skipped in the display.
335:
336: =item * B<suppressEmptySequences>: default: false
337:
338: If you're using a filter function, and displaying sequences to orient
339: the user, then frequently some sequences will be empty. Setting this to
340: true will cause those sequences not to display, so as not to confuse the
341: user into thinking that if the sequence is there there should be things
342: under it; for example, see the "Show Uncompleted Homework" view on the
343: B<NAV> screen.
344:
345: =item * B<suppressNavmaps>: default: false
346:
347: If true, will not display Navigate Content resources.
348:
349: =back
350:
351: =head2 Additional Info
352:
353: In addition to the parameters you can pass to the renderer, which will
354: be passed through unchange to the column renderers, the renderer will
355: generate the following information which your renderer may find
356: useful:
357:
358: =over 4
359:
360: =item * B<counter>:
361:
362: Contains the number of rows printed. Useful after calling the render
363: function, as you can detect whether anything was printed at all.
364:
365: =item * B<isNewBranch>:
366:
367: Useful for renderers: If this resource is currently the first resource
368: of a new branch, this will be true. The Resource column (leftmost in the
369: navmaps screen) uses this to display the "new branch" icon
370:
371: =back
372:
373: =cut
374:
375:
376: =head1 SUBROUTINES
377:
378: =over
379:
380: =item update()
381:
382: =item addToFilter()
383:
384: Convenience functions: Returns a string that adds or subtracts
385: the second argument from the first hash, appropriate for the
386: query string that determines which folders to recurse on
387:
388: =item removeFromFilter()
389:
390: =item getLinkForResource()
391:
392: Convenience function: Given a stack returned from getStack on the iterator,
393: return the correct src() value.
394:
395: =item getDescription()
396:
397: Convenience function: This separates the logic of how to create
398: the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
399: etc.) into a separate function. It takes a resource object as the
400: first parameter, and the part number of the resource as the second.
401: It's basically a big switch statement on the status of the resource.
402:
403: =item dueInLessThan24Hours()
404:
405: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
406:
407: =item lastTry()
408:
409: Convenience function, so others can use it: Is there only one try remaining for the
410: part, with more than one try to begin with, not due yet and still can be done?
411:
412: =item advancedUser()
413:
414: This puts a human-readable name on the env variable.
415:
416: =item timeToHumanString()
417:
418: timeToHumanString takes a time number and converts it to a
419: human-readable representation, meant to be used in the following
420: manner:
421:
422: =over 4
423:
424: =item * print "Due $timestring"
425:
426: =item * print "Open $timestring"
427:
428: =item * print "Answer available $timestring"
429:
430: =back
431:
432: Very, very, very, VERY English-only... goodness help a localizer on
433: this func...
434:
435: =item resource()
436:
437: returns 0
438:
439: =item communication_status()
440:
441: returns 1
442:
443: =item quick_status()
444:
445: returns 2
446:
447: =item long_status()
448:
449: returns 3
450:
451: =item part_status_summary()
452:
453: returns 4
454:
455: =item render_resource()
456:
457: =item render_communication_status()
458:
459: =item render_quick_status()
460:
461: =item render_long_status()
462:
463: =item render_parts_summary_status()
464:
465: =item setDefault()
466:
467: =item cmp_title()
468:
469: =item render()
470:
471: =item add_linkitem()
472:
473: =item show_linkitems_toolbar()
474:
475: =back
476:
477: =cut
478:
479: package Apache::lonnavmaps;
480:
481: use strict;
482: use GDBM_File;
483: use Apache::loncommon();
484: use Apache::lonenc();
485: use Apache::lonlocal;
486: use Apache::lonnet;
487: use Apache::lonmap;
488:
489: use POSIX qw (ceil floor strftime);
490: use Time::HiRes qw( gettimeofday tv_interval );
491: use LONCAPA;
492: use DateTime();
493: use HTML::Entities;
494:
495: # For debugging
496:
497: #use Data::Dumper;
498:
499:
500: # symbolic constants
501: sub SYMB { return 1; }
502: sub URL { return 2; }
503: sub NOTHING { return 3; }
504:
505: # Some data
506:
507: my $resObj = "Apache::lonnavmaps::resource";
508:
509: # Keep these mappings in sync with lonquickgrades, which usesthe colors
510: # instead of the icons.
511: my %statusIconMap =
512: (
513: $resObj->CLOSED => '',
514: $resObj->OPEN => 'navmap.open.gif',
515: $resObj->CORRECT => 'navmap.correct.gif',
516: $resObj->PARTIALLY_CORRECT => 'navmap.partial.gif',
517: $resObj->INCORRECT => 'navmap.wrong.gif',
518: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
519: $resObj->ERROR => ''
520: );
521:
522: my %iconAltTags = #texthash does not work here
523: ( 'navmap.correct.gif' => 'Correct',
524: 'navmap.wrong.gif' => 'Incorrect',
525: 'navmap.open.gif' => 'Is Open',
526: 'navmap.partial.gif' => 'Partially Correct',
527: 'navmap.ellipsis.gif' => 'Attempted',
528: );
529:
530: # Defines a status->color mapping, null string means don't color
531: my %colormap =
532: ( $resObj->NETWORK_FAILURE => '',
533: $resObj->CORRECT => '',
534: $resObj->EXCUSED => '#3333FF',
535: $resObj->PAST_DUE_ANSWER_LATER => '',
536: $resObj->PAST_DUE_NO_ANSWER => '',
537: $resObj->ANSWER_OPEN => '#006600',
538: $resObj->OPEN_LATER => '',
539: $resObj->TRIES_LEFT => '',
540: $resObj->INCORRECT => '',
541: $resObj->OPEN => '',
542: $resObj->NOTHING_SET => '',
543: $resObj->ATTEMPTED => '',
544: $resObj->CREDIT_ATTEMPTED => '',
545: $resObj->ANSWER_SUBMITTED => '',
546: $resObj->PARTIALLY_CORRECT => '#006600'
547: );
548: # And a special case in the nav map; what to do when the assignment
549: # is not yet done and due in less than 24 hours
550: my $hurryUpColor = "#FF0000";
551:
552: sub addToFilter {
553: my $hashIn = shift;
554: my $addition = shift;
555: my %hash = %$hashIn;
556: $hash{$addition} = 1;
557:
558: return join (",", keys(%hash));
559: }
560:
561: sub removeFromFilter {
562: my $hashIn = shift;
563: my $subtraction = shift;
564: my %hash = %$hashIn;
565:
566: delete $hash{$subtraction};
567: return join(",", keys(%hash));
568: }
569:
570: sub getLinkForResource {
571: my $stack = shift;
572: my $res;
573:
574: # Check to see if there are any pages in the stack
575: foreach $res (@$stack) {
576: if (defined($res)) {
577: my $anchor;
578: if ($res->is_page()) {
579: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
580: $anchor=&escape($anchor->shown_symb());
581: return ($res->link(),$res->shown_symb(),$anchor);
582: }
583: # in case folder was skipped over as "only sequence"
584: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
585: if ($map=~/\.page$/) {
586: my $url=&Apache::lonnet::clutter($map);
587: $anchor=&escape($res->shown_symb());
588: return ($url,$res->shown_symb(),$anchor);
589: }
590: }
591: }
592:
593: # Failing that, return the src of the last resource that is defined
594: # (when we first recurse on a map, it puts an undefined resource
595: # on the bottom because $self->{HERE} isn't defined yet, and we
596: # want the src for the map anyhow)
597: foreach my $item (@$stack) {
598: if (defined($item)) { $res = $item; }
599: }
600:
601: if ($res) {
602: return ($res->link(),$res->shown_symb());
603: }
604: return;
605: }
606:
607:
608:
609: sub getDescription {
610: my $res = shift;
611: my $part = shift;
612: my $status = $res->status($part);
613:
614: my $open = $res->opendate($part);
615: my $due = $res->duedate($part);
616: my $answer = $res->answerdate($part);
617:
618: if ($status == $res->NETWORK_FAILURE) {
619: return &mt("Having technical difficulties; please check status later");
620: }
621: if ($status == $res->NOTHING_SET) {
622: return &Apache::lonhtmlcommon::direct_parm_link(&mt('Not currently assigned'),$res->symb(),'opendate',$part);
623: }
624: if ($status == $res->OPEN_LATER) {
625: return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start'),$res->symb(),'opendate',$part));
626: }
627: my $slotinfo;
628: if ($res->simpleStatus($part) == $res->OPEN) {
629: unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
630: my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
631: my $slotmsg;
632: if ($slot_status == $res->UNKNOWN) {
633: $slotmsg = &mt('Reservation status unknown');
634: } elsif ($slot_status == $res->RESERVED) {
635: $slotmsg = &mt('Reserved - ends [_1]',
636: timeToHumanString($slot_time,'end'));
637: } elsif ($slot_status == $res->RESERVED_LOCATION) {
638: $slotmsg = &mt('Reserved - specific location(s) - ends [_1]',
639: timeToHumanString($slot_time,'end'));
640: } elsif ($slot_status == $res->RESERVED_LATER) {
641: $slotmsg = &mt('Reserved - next open [_1]',
642: timeToHumanString($slot_time,'start'));
643: } elsif ($slot_status == $res->RESERVABLE) {
644: $slotmsg = &mt('Reservable, reservations close [_1]',
645: timeToHumanString($slot_time,'end'));
646: } elsif ($slot_status == $res->NEEDS_CHECKIN) {
647: $slotmsg = &mt('Reserved, check-in needed - ends [_1]',
648: timeToHumanString($slot_time,'end'));
649: } elsif ($slot_status == $res->RESERVABLE_LATER) {
650: $slotmsg = &mt('Reservable, reservations open [_1]',
651: timeToHumanString($slot_time,'start'));
652: } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
653: $slotmsg = &mt('Reserve a time/place to work');
654: } elsif ($slot_status == $res->NOTRESERVABLE) {
655: $slotmsg = &mt('Reservation not available');
656: } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
657: $slotmsg = &mt('Submission in grading queue');
658: }
659: if ($slotmsg) {
660: if ($res->is_task() || !$due) {
661: return $slotmsg;
662: }
663: $slotinfo = (' ' x 2).'('.$slotmsg.')';
664: }
665: }
666: }
667: if ($status == $res->OPEN) {
668: if ($due) {
669: if ($res->is_practice()) {
670: return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part)).$slotinfo;
671: } else {
672: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)).$slotinfo;
673: }
674: } else {
675: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part).$slotinfo;
676: }
677: }
678: if ($status == $res->PAST_DUE_ANSWER_LATER) {
679: return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start'),$res->symb(),'answerdate',$part));
680: }
681: if ($status == $res->PAST_DUE_NO_ANSWER) {
682: if ($res->is_practice()) {
683: return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'answerdate,duedate',$part));
684: } else {
685: return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'answerdate,duedate',$part));
686: }
687: }
688: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
689: && $res->handgrade($part) ne 'yes') {
690: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Answer available"),$res->symb(),'answerdate,duedate',$part);
691: }
692: if ($status == $res->EXCUSED) {
693: return &mt("Excused by instructor");
694: }
695: if ($status == $res->ATTEMPTED) {
696: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
697: return &mt("Survey submission recorded");
698: } else {
699: return &mt("Answer submitted, not yet graded");
700: }
701: }
702: if ($status == $res->CREDIT_ATTEMPTED) {
703: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
704: return &mt("Credit for survey submission");
705: }
706: }
707: if ($status == $res->TRIES_LEFT) {
708: my $tries = $res->tries($part);
709: my $maxtries = $res->maxtries($part);
710: my $triesString = "";
711: if ($tries && $maxtries) {
712: $triesString = '<span class="LC_fontsize_medium"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></span>';
713: if ($maxtries > 1 && $maxtries - $tries == 1) {
714: $triesString = "<b>$triesString</b>";
715: }
716: }
717: if ($due) {
718: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)) .
719: " $triesString";
720: } else {
721: return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
722: }
723: }
724: if ($status == $res->ANSWER_SUBMITTED) {
725: return &mt('Answer submitted');
726: }
727: }
728:
729:
730: sub dueInLessThan24Hours {
731: my $res = shift;
732: my $part = shift;
733: my $status = $res->status($part);
734:
735: return ($status == $res->OPEN() ||
736: $status == $res->TRIES_LEFT()) &&
737: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
738: $res->duedate($part) > time();
739: }
740:
741:
742: sub lastTry {
743: my $res = shift;
744: my $part = shift;
745:
746: my $tries = $res->tries($part);
747: my $maxtries = $res->maxtries($part);
748: return $tries && $maxtries && $maxtries > 1 &&
749: $maxtries - $tries == 1 && $res->duedate($part) &&
750: $res->duedate($part) > time();
751: }
752:
753:
754: sub advancedUser {
755: return $env{'request.role.adv'};
756: }
757:
758: sub timeToHumanString {
759: my ($time,$type,$format) = @_;
760:
761: # zero, '0' and blank are bad times
762: if (!$time) {
763: return &mt('never');
764: }
765: unless (&Apache::lonlocal::current_language()=~/^en/) {
766: return &Apache::lonlocal::locallocaltime($time);
767: }
768: my $now = time();
769:
770: # Positive = future
771: my $delta = $time - $now;
772:
773: my $minute = 60;
774: my $hour = 60 * $minute;
775: my $day = 24 * $hour;
776: my $week = 7 * $day;
777: my $inPast = 0;
778:
779: # Logic in comments:
780: # Is it now? (extremely unlikely)
781: if ( $delta == 0 ) {
782: return "this instant";
783: }
784:
785: if ($delta < 0) {
786: $inPast = 1;
787: $delta = -$delta;
788: }
789:
790: if ( $delta > 0 ) {
791:
792: my $tense = $inPast ? " ago" : "";
793: my $prefix = $inPast ? "" : "in ";
794:
795: # Less than a minute
796: if ( $delta < $minute ) {
797: if ($delta == 1) { return "${prefix}1 second$tense"; }
798: return "$prefix$delta seconds$tense";
799: }
800:
801: # Less than an hour
802: if ( $delta < $hour ) {
803: # If so, use minutes; or minutes, seconds (if format requires)
804: my $minutes = floor($delta / 60);
805: if (($format ne '') && ($format =~ /\%(T|S)/)) {
806: my $display;
807: if ($minutes == 1) {
808: $display = "${prefix}1 minute";
809: } else {
810: $display = "$prefix$minutes minutes";
811: }
812: my $seconds = $delta % $minute;
813: if ($seconds == 0) {
814: $display .= $tense;
815: } elsif ($seconds == 1) {
816: $display .= ", 1 second$tense";
817: } else {
818: $display .= ", $seconds seconds$tense";
819: }
820: return $display;
821: }
822: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
823: return "$prefix$minutes minutes$tense";
824: }
825:
826: # Is it less than 24 hours away? If so,
827: # display hours + minutes, (and + seconds, if format specified it)
828: if ( $delta < $hour * 24) {
829: my $hours = floor($delta / $hour);
830: my $minutes = floor(($delta % $hour) / $minute);
831: my $hourString = "$hours hours";
832: my $minuteString = ", $minutes minutes";
833: if ($hours == 1) {
834: $hourString = "1 hour";
835: }
836: if ($minutes == 1) {
837: $minuteString = ", 1 minute";
838: }
839: if ($minutes == 0) {
840: $minuteString = "";
841: }
842: if (($format ne '') && ($format =~ /\%(T|S)/)) {
843: my $display = "$prefix$hourString$minuteString";
844: my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
845: if ($seconds == 0) {
846: $display .= $tense;
847: } elsif ($seconds == 1) {
848: $display .= ", 1 second$tense";
849: } else {
850: $display .= ", $seconds seconds$tense";
851: }
852: return $display;
853: }
854: return "$prefix$hourString$minuteString$tense";
855: }
856:
857: # Date/time is more than 24 hours away
858:
859: my $dt = DateTime->from_epoch(epoch => $time)
860: ->set_time_zone(&Apache::lonlocal::gettimezone());
861:
862: # If there's a caller supplied format, use it, unless it only displays
863: # H:M:S or H:M.
864:
865: if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
866: my $timeStr = $dt->strftime($format);
867: return $timeStr.' ('.$dt->time_zone_short_name().')';
868: }
869:
870: # Less than 5 days away, display day of the week and
871: # HH:MM
872:
873: if ( $delta < $day * 5 ) {
874: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
875: $timeStr =~ s/12:00 am/00:00/;
876: $timeStr =~ s/12:00 pm/noon/;
877: return ($inPast ? "last " : "this ") .
878: $timeStr;
879: }
880:
881: my $conjunction='on';
882: if ($type eq 'start') {
883: $conjunction='at';
884: } elsif ($type eq 'end') {
885: $conjunction='by';
886: }
887: # Is it this year?
888: my $dt_now = DateTime->from_epoch(epoch => $now)
889: ->set_time_zone(&Apache::lonlocal::gettimezone());
890: if ( $dt->year() == $dt_now->year()) {
891: # Return on Month Day, HH:MM meridian
892: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
893: $timeStr =~ s/12:00 am/00:00/;
894: $timeStr =~ s/12:00 pm/noon/;
895: return $timeStr;
896: }
897:
898: # Not this year, so show the year
899: my $timeStr =
900: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
901: $timeStr =~ s/12:00 am/00:00/;
902: $timeStr =~ s/12:00 pm/noon/;
903: return $timeStr;
904: }
905: }
906:
907:
908: sub resource { return 0; }
909: sub communication_status { return 1; }
910: sub quick_status { return 2; }
911: sub long_status { return 3; }
912: sub part_status_summary { return 4; }
913:
914: sub render_resource {
915: my ($resource, $part, $params) = @_;
916:
917: my $editmapLink;
918: my $nonLinkedText = ''; # stuff after resource title not in link
919:
920: my $link = $params->{"resourceLink"};
921: if ($resource->ext()) {
922: $link =~ s/\#.+(\?)/$1/g;
923: }
924:
925: # The URL part is not escaped at this point, but the symb is...
926:
927: my $src = $resource->src();
928: my $it = $params->{"iterator"};
929: my $filter = $it->{FILTER};
930:
931: my $title = $resource->compTitle();
932:
933: my $partLabel = "";
934: my $newBranchText = "";
935: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
936: # If this is a new branch, label it so
937: if ($params->{'isNewBranch'}) {
938: $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
939: }
940:
941: # links to open and close the folder
942:
943: my $whitespace = $location.'/whitespace_21.gif';
944: my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
945: my $linkclose = "</a>";
946:
947: # Default icon: unknown page
948: my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
949:
950: if ($resource->is_problem()) {
951: if ($part eq '0' || $params->{'condensed'}) {
952: $icon = '<img class="LC_contentImage" src="'.$location.'/';
953: if ($resource->is_task()) {
954: $icon .= 'task.gif" alt="'.&mt('Task');
955: } else {
956: $icon .= 'problem.gif" alt="'.&mt('Problem');
957: }
958: $icon .='" />';
959: } else {
960: $icon = $params->{'indentString'};
961: }
962: } else {
963: $icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
964: }
965:
966: # Display the correct map icon to open or shut map
967: if ($resource->is_map()) {
968: my $mapId = $resource->map_pc();
969: my $nowOpen = !defined($filter->{$mapId});
970: if ($it->{CONDITION}) {
971: $nowOpen = !$nowOpen;
972: }
973:
974: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
975: my $title=$resource->title;
976: $title=~s/\"/\&qout;/g;
977: if (!$params->{'resource_no_folder_link'}) {
978: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
979: $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
980: ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
981: .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
982: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
983: $params->{'queryString'} . '&filter=';
984: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
985: addToFilter($filter, $mapId) :
986: removeFromFilter($filter, $mapId);
987: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
988: . $params->{'hereType'} . '&here=' .
989: &escape($params->{'here'}) .
990: '&jump=' .
991: &escape($resource->symb()) .
992: "&folderManip=1\">";
993:
994: } else {
995: # Don't allow users to manipulate folder
996: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
997: $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
998: if ($params->{'caller'} eq 'sequence') {
999: $linkopen = "<a href=\"$link\">";
1000: } else {
1001: $linkopen = "";
1002: $linkclose = "";
1003: }
1004: }
1005: if (((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
1006: (&Apache::lonnet::allowed('cev',$env{'request.course.id'}))) &&
1007: ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/)) {
1008: if (!$params->{'map_no_edit_link'}) {
1009: my $icon = &Apache::loncommon::lonhttpdurl('/res/adm/pages').'/editmap.png';
1010: $editmapLink=' '.
1011: '<a href="/adm/coursedocs?command=directnav&symb='.&escape($resource->symb()).'">'.
1012: '<img src="'.$icon.'" alt="'.&mt('Edit Content').'" title="'.&mt('Edit Content').'" />'.
1013: '</a>';
1014: }
1015: }
1016: if ($params->{'mapHidden'} || $resource->randomout()) {
1017: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
1018: }
1019: } else {
1020: if ($resource->randomout()) {
1021: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
1022: }
1023: }
1024: if (!$resource->condval()) {
1025: $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
1026: }
1027: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
1028: $nonLinkedText .=' <span class="LC_info"><b>'.&mt('not graded').'</b></span>';
1029: }
1030:
1031: # We're done preparing and finally ready to start the rendering
1032: my $result = '<td class="LC_middle">';
1033: my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
1034:
1035: my $indentLevel = $params->{'indentLevel'};
1036: if ($newBranchText) { $indentLevel--; }
1037:
1038: # print indentation
1039: for (my $i = 0; $i < $indentLevel; $i++) {
1040: $result .= $params->{'indentString'};
1041: }
1042:
1043: # Decide what to display
1044: $result .= "$newBranchText$linkopen$icon$linkclose";
1045:
1046: my $curMarkerBegin = '';
1047: my $curMarkerEnd = '';
1048:
1049: # Is this the current resource?
1050: if (!$params->{'displayedHereMarker'} &&
1051: $resource->symb() eq $params->{'here'} ) {
1052: unless ($resource->is_map()) {
1053: $curMarkerBegin = '<span class="LC_current_nav_location">';
1054: $curMarkerEnd = '</span>';
1055: }
1056: $params->{'displayedHereMarker'} = 1;
1057: }
1058:
1059: if ($resource->is_problem() && $part ne '0' &&
1060: !$params->{'condensed'}) {
1061: my $displaypart=$resource->part_display($part);
1062: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1063: if ($link!~/\#/) { $link.='#'.&escape($part); }
1064: $title = "";
1065: }
1066:
1067: if ($params->{'condensed'} && $resource->countParts() > 1) {
1068: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1069: }
1070:
1071: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1072: $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$editmapLink$nonLinkedText</td>";
1073: } else {
1074: $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$editmapLink$nonLinkedText</td>";
1075: }
1076:
1077: return $result;
1078: }
1079:
1080: sub render_communication_status {
1081: my ($resource, $part, $params) = @_;
1082: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1083:
1084: my $link = $params->{"resourceLink"};
1085: my $linkopen = "<a href=\"$link\">";
1086: my $linkclose = "</a>";
1087: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1088:
1089: if ($resource->hasDiscussion()) {
1090: $discussionHTML = $linkopen .
1091: '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1092: $linkclose;
1093: }
1094:
1095: if ($resource->getFeedback()) {
1096: my $feedback = $resource->getFeedback();
1097: foreach my $msgid (split(/\,/, $feedback)) {
1098: if ($msgid) {
1099: $feedbackHTML .= ' <a href="/adm/email?display='
1100: . &escape($msgid) . '">'
1101: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1102: }
1103: }
1104: }
1105:
1106: if ($resource->getErrors()) {
1107: my $errors = $resource->getErrors();
1108: my $errorcount = 0;
1109: foreach my $msgid (split(/,/, $errors)) {
1110: last if ($errorcount>=10); # Only output 10 bombs maximum
1111: if ($msgid) {
1112: $errorcount++;
1113: $errorHTML .= ' <a href="/adm/email?display='
1114: . &escape($msgid) . '">'
1115: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1116: }
1117: }
1118: }
1119:
1120: if ($params->{'multipart'} && $part != '0') {
1121: $discussionHTML = $feedbackHTML = $errorHTML = '';
1122: }
1123: return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1124:
1125: }
1126: sub render_quick_status {
1127: my ($resource, $part, $params) = @_;
1128: my $result = "";
1129: my $firstDisplayed = !$params->{'condensed'} &&
1130: $params->{'multipart'} && $part eq "0";
1131:
1132: my $link = $params->{"resourceLink"};
1133: my $linkopen = "<a href=\"$link\">";
1134: my $linkclose = "</a>";
1135:
1136: $result .= '<td class="LC_middle">';
1137: if ($resource->is_problem() &&
1138: !$firstDisplayed) {
1139: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1140: my $alt = $iconAltTags{$icon};
1141: if ($icon) {
1142: my $location=
1143: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1144: $result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;
1145: } else {
1146: $result .= " ";
1147: }
1148: } else { # not problem, no icon
1149: $result .= " ";
1150: }
1151: $result .= "</td>\n";
1152: return $result;
1153: }
1154: sub render_long_status {
1155: my ($resource, $part, $params) = @_;
1156: my $result = '<td class="LC_middle LC_right">';
1157: my $firstDisplayed = !$params->{'condensed'} &&
1158: $params->{'multipart'} && $part eq "0";
1159:
1160: my $color;
1161: my $info = '';
1162: if ($resource->is_problem() || $resource->is_practice()) {
1163: $color = $colormap{$resource->status};
1164:
1165: if (dueInLessThan24Hours($resource, $part)) {
1166: $color = $hurryUpColor;
1167: $info = ' title="'.&mt('Due in less than 24 hours!').'"';
1168: } elsif (lastTry($resource, $part)) {
1169: unless (($resource->problemstatus($part) eq 'no') ||
1170: ($resource->problemstatus($part) eq 'no_feedback_ever')) {
1171: $color = $hurryUpColor;
1172: $info = ' title="'.&mt('One try remaining!').'"';
1173: }
1174: }
1175: }
1176:
1177: if ($resource->kind() eq "res" &&
1178: $resource->is_raw_problem() &&
1179: !$firstDisplayed) {
1180: if ($color) {$result .= '<span style="color:'.$color.'"'.$info.'><b>'; }
1181: $result .= getDescription($resource, $part);
1182: if ($color) {$result .= "</b></span>"; }
1183: }
1184: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1185: $result .= &mt('(randomly select [_1])', $resource->randompick());
1186: }
1187: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1188: $result .= &mt('(randomly ordered)');
1189: }
1190:
1191: # Debugging code
1192: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1193: # ' - Part: ' . $part;
1194:
1195: $result .= "</td>\n";
1196:
1197: return $result;
1198: }
1199:
1200: # Colors obtained by taking the icons, matching the colors, and
1201: # possibly reducing the Value (HSV) of the color, if it's too bright
1202: # for text, generally by one third or so.
1203: my %statusColors =
1204: (
1205: $resObj->CLOSED => '#000000',
1206: $resObj->OPEN => '#998b13',
1207: $resObj->CORRECT => '#26933f',
1208: $resObj->INCORRECT => '#c48207',
1209: $resObj->ATTEMPTED => '#a87510',
1210: $resObj->ERROR => '#000000'
1211: );
1212: my %statusStrings =
1213: (
1214: $resObj->CLOSED => 'Not yet open',
1215: $resObj->OPEN => 'Open',
1216: $resObj->CORRECT => 'Correct',
1217: $resObj->INCORRECT => 'Incorrect',
1218: $resObj->ATTEMPTED => 'Attempted',
1219: $resObj->ERROR => 'Network Error'
1220: );
1221: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1222:
1223: sub render_parts_summary_status {
1224: my ($resource, $part, $params) = @_;
1225: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1226: if ($params->{showParts}) {
1227: return '<td></td>';
1228: }
1229:
1230: my $td = "<td align='right'>\n";
1231: my $endtd = "</td>\n";
1232: my @probs;
1233:
1234: if ($resource->contains_problem) {
1235: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1236: } else {
1237: @probs=($resource);
1238: }
1239: my $return;
1240: my %overallstatus;
1241: my $totalParts;
1242: foreach my $resource (@probs) {
1243: # If there is a single part, just show the simple status
1244: if ($resource->singlepart()) {
1245: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1246: $overallstatus{$status}++;
1247: $totalParts++;
1248: next;
1249: }
1250: # Now we can be sure the $part doesn't really matter.
1251: my $statusCount = $resource->simpleStatusCount();
1252: my @counts;
1253: foreach my $status (@statuses) {
1254: # decouple display order from the simpleStatusCount order
1255: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1256: if ($statusCount->[$slot]) {
1257: $overallstatus{$status}+=$statusCount->[$slot];
1258: $totalParts+=$statusCount->[$slot];
1259: }
1260: }
1261: }
1262: $return.= $td . $totalParts . ' parts: ';
1263: foreach my $status (@statuses) {
1264: if ($overallstatus{$status}) {
1265: $return.='<span style="color:' . $statusColors{$status}
1266: . '">' . $overallstatus{$status} . ' '
1267: . $statusStrings{$status} . '</span>';
1268: }
1269: }
1270: $return.= $endtd;
1271: return $return;
1272: }
1273:
1274: my @preparedColumns = (\&render_resource, \&render_communication_status,
1275: \&render_quick_status, \&render_long_status,
1276: \&render_parts_summary_status);
1277:
1278: sub setDefault {
1279: my ($val, $default) = @_;
1280: if (!defined($val)) { return $default; }
1281: return $val;
1282: }
1283:
1284: sub cmp_title {
1285: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1286: $atitle=~s/^\s*//;
1287: $btitle=~s/^\s*//;
1288: return $atitle cmp $btitle;
1289: }
1290:
1291: sub render {
1292: my $args = shift;
1293: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1294: my $result = '';
1295: # Configure the renderer.
1296: my $cols = $args->{'cols'};
1297: if (!defined($cols)) {
1298: # no columns, no nav maps.
1299: return '';
1300: }
1301: my $navmap;
1302: if (defined($args->{'navmap'})) {
1303: $navmap = $args->{'navmap'};
1304: }
1305:
1306: my $r = $args->{'r'};
1307: my $queryString = $args->{'queryString'};
1308: my $jump = $args->{'jump'};
1309: my $here = $args->{'here'};
1310: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1311: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1312: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1313: # before the current resource when using #current
1314:
1315: # If we were passed 'here' information, we are not rendering
1316: # after a folder manipulation, and we were not passed an
1317: # iterator, make sure we open the folders to show the "here"
1318: # marker
1319: my $filterHash = {};
1320: # Figure out what we're not displaying
1321: foreach my $item (split(/\,/, $env{"form.filter"})) {
1322: if ($item) {
1323: $filterHash->{$item} = "1";
1324: }
1325: }
1326:
1327: # Filter: Remember filter function and add our own filter: Refuse
1328: # to show hidden resources unless the user can see them.
1329: my $userCanSeeHidden = advancedUser();
1330: my $filterFunc = setDefault($args->{'filterFunc'},
1331: sub {return 1;});
1332: if (!$userCanSeeHidden) {
1333: # Without renaming the filterfunc, the server seems to go into
1334: # an infinite loop
1335: my $oldFilterFunc = $filterFunc;
1336: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1337: &$oldFilterFunc($res);};
1338: }
1339:
1340: my $condition = 0;
1341: if ($env{'form.condition'}) {
1342: $condition = 1;
1343: }
1344:
1345: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1346: # Step 1: Check to see if we have a navmap
1347: if (!defined($navmap)) {
1348: $navmap = Apache::lonnavmaps::navmap->new();
1349: if (!defined($navmap)) {
1350: # no longer in course
1351: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1352: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1353: }
1354: }
1355:
1356: # Step two: Locate what kind of here marker is necessary
1357: # Determine where the "here" marker is and where the screen jumps to.
1358:
1359: if ($env{'form.postsymb'} ne '') {
1360: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1361: } elsif ($env{'form.postdata'} ne '') {
1362: # couldn't find a symb, is there a URL?
1363: my $currenturl = $env{'form.postdata'};
1364: #$currenturl=~s/^http\:\/\///;
1365: #$currenturl=~s/^[^\/]+//;
1366: unless ($args->{'caller'} eq 'sequence') {
1367: $here = $jump = &Apache::lonnet::symbread($currenturl);
1368: }
1369: }
1370: if (($here eq '') && ($args->{'caller'} ne 'sequence')) {
1371: my $last;
1372: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1373: &GDBM_READER(),0640)) {
1374: $last=$hash{'last_known'};
1375: untie(%hash);
1376: }
1377: if ($last) { $here = $jump = $last; }
1378: }
1379:
1380: # Step three: Ensure the folders are open
1381: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1382: my $curRes;
1383: my $found = 0;
1384:
1385: # We only need to do this if we need to open the maps to show the
1386: # current position. This will change the counter so we can't count
1387: # for the jump marker with this loop.
1388: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1389: if (ref($curRes) && $curRes->symb() eq $here) {
1390: my $mapStack = $mapIterator->getStack();
1391:
1392: # Ensure the parent maps are open
1393: for my $map (@{$mapStack}) {
1394: if ($condition) {
1395: undef $filterHash->{$map->map_pc()};
1396: } else {
1397: $filterHash->{$map->map_pc()} = 1;
1398: }
1399: }
1400: $found = 1;
1401: }
1402: }
1403: }
1404:
1405: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1406: # If this is a click on a folder or something, we want to preserve the "here"
1407: # from the querystring, and get the new "jump" marker
1408: $here = $env{'form.here'};
1409: $jump = $env{'form.jump'};
1410: }
1411:
1412: my $it = $args->{'iterator'};
1413: if (!defined($it)) {
1414: # Construct a default iterator based on $env{'form.'} information
1415:
1416: # Step 1: Check to see if we have a navmap
1417: if (!defined($navmap)) {
1418: $navmap = Apache::lonnavmaps::navmap->new();
1419: if (!defined($navmap)) {
1420: # no longer in course
1421: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1422: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1423: }
1424: }
1425:
1426: # See if we're being passed a specific map
1427: if ($args->{'iterator_map'}) {
1428: my $map = $args->{'iterator_map'};
1429: $map = $navmap->getResourceByUrl($map);
1430: my $firstResource = $map->map_start();
1431: my $finishResource = $map->map_finish();
1432:
1433: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1434: } else {
1435: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1436: }
1437: }
1438:
1439: # (re-)Locate the jump point, if any
1440: # Note this does not take filtering or hidden into account... need
1441: # to be fixed?
1442: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1443: my $curRes;
1444: my $foundJump = 0;
1445: my $counter = 0;
1446:
1447: while (($curRes = $mapIterator->next()) && !$foundJump) {
1448: if (ref($curRes)) { $counter++; }
1449:
1450: if (ref($curRes) && $jump eq $curRes->symb()) {
1451:
1452: # This is why we have to use the main iterator instead of the
1453: # potentially faster DFS: The count has to be the same, so
1454: # the order has to be the same, which DFS won't give us.
1455: $args->{'currentJumpIndex'} = $counter;
1456: $foundJump = 1;
1457: }
1458: }
1459:
1460: my $showParts = setDefault($args->{'showParts'}, 1);
1461: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1462: # keeps track of when the current resource is found,
1463: # so we can back up a few and put the anchor above the
1464: # current resource
1465: my $printKey = $args->{'printKey'};
1466: my $printCloseAll = $args->{'printCloseAll'};
1467: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1468:
1469: # Print key?
1470: if ($printKey) {
1471: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1472: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1473: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1474: if ($navmap->{LAST_CHECK}) {
1475: $result .=
1476: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1477: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1478: '</td><td align="center" valign="bottom"> '.
1479: '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1480: '</td>';
1481: } else {
1482: $result .= '<td align="center" valign="bottom"> '.
1483: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1484: ' <img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1485: '</td>';
1486: }
1487:
1488: $result .= '</tr></table>';
1489: }
1490:
1491: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1492: my ($link,$text);
1493: if ($condition) {
1494: $link='navmaps?condition=0&filter=&'.$queryString.
1495: '&here='.&escape($here);
1496: $text='Close all folders';
1497: } else {
1498: $link='navmaps?condition=1&filter=&'.$queryString.
1499: '&here='.&escape($here);
1500: $text='Open all folders';
1501: }
1502: if ($env{'form.register'}) {
1503: $link .= '&register='.$env{'form.register'};
1504: }
1505: if ($args->{'caller'} eq 'navmapsdisplay') {
1506: unless ($args->{'notools'}) {
1507: &add_linkitem($args->{'linkitems'},'changefolder',
1508: "location.href='$link'",$text);
1509: }
1510: } else {
1511: $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1512: }
1513: $result .= "\n";
1514: }
1515:
1516: # Check for any unread discussions in all resources.
1517: if (($args->{'caller'} eq 'navmapsdisplay') && (!$args->{'notools'})) {
1518: &add_linkitem($args->{'linkitems'},'clearbubbles',
1519: 'document.clearbubbles.submit()',
1520: 'Mark all posts read');
1521: my $time=time;
1522: my $querystr = &HTML::Entities::encode($ENV{'QUERY_STRING'},'<>&"');
1523: $result .= (<<END);
1524: <form name="clearbubbles" method="post" action="/adm/feedback">
1525: <input type="hidden" name="navurl" value="$querystr" />
1526: <input type="hidden" name="navtime" value="$time" />
1527: END
1528: if ($env{'form.register'}) {
1529: $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
1530: }
1531: if ($args->{'sort'} eq 'discussion') {
1532: my $totdisc = 0;
1533: my $haveDisc = '';
1534: my @allres=$navmap->retrieveResources();
1535: foreach my $resource (@allres) {
1536: if ($resource->hasDiscussion()) {
1537: $haveDisc .= $resource->wrap_symb().':';
1538: $totdisc ++;
1539: }
1540: }
1541: if ($totdisc > 0) {
1542: $haveDisc =~ s/:$//;
1543: $result .= (<<END);
1544: <input type="hidden" name="navmaps" value="$haveDisc" />
1545: </form>
1546: END
1547: }
1548: }
1549: $result.='</form>';
1550: }
1551: if (($args->{'caller'} eq 'navmapsdisplay') &&
1552: ((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
1553: (&Apache::lonnet::allowed('cev',$env{'request.course.id'})))) {
1554: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1555: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
1556: if ($env{'course.'.$env{'request.course.id'}.'.url'} eq
1557: "uploaded/$cdom/$cnum/default.sequence") {
1558: &add_linkitem($args->{'linkitems'},'edittoplevel',
1559: "javascript:gocmd('/adm/coursedocs','editdocs');",
1560: 'Content Editor');
1561: }
1562: }
1563:
1564: if ($args->{'caller'} eq 'navmapsdisplay') {
1565: $result .= &show_linkitems_toolbar($args,$condition);
1566: } elsif ($args->{'sort_html'}) {
1567: $result.=$args->{'sort_html'};
1568: }
1569:
1570: #$result .= "<br />\n";
1571: if ($r) {
1572: $r->print($result);
1573: $r->rflush();
1574: $result = "";
1575: }
1576: # End parameter setting
1577:
1578: $result .= "<br />\n";
1579:
1580: # Data
1581: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1582:
1583: my $res = "Apache::lonnavmaps::resource";
1584: my %condenseStatuses =
1585: ( $res->NETWORK_FAILURE => 1,
1586: $res->NOTHING_SET => 1,
1587: $res->CORRECT => 1 );
1588:
1589: # Shared variables
1590: $args->{'counter'} = 0; # counts the rows
1591: $args->{'indentLevel'} = 0;
1592: $args->{'isNewBranch'} = 0;
1593: $args->{'condensed'} = 0;
1594:
1595: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1596: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1597: $args->{'displayedHereMarker'} = 0;
1598:
1599: # If we're suppressing empty sequences, look for them here.
1600: # We also do this even if $args->{'suppressEmptySequences'}
1601: # is not true, so we can hide empty sequences for which the
1602: # hiddenresource parameter is set to yes (at map level), or
1603: # mark as hidden for users who have $userCanSeeHidden.
1604: # Use DFS for speed, since structure actually doesn't matter,
1605: # except what map has what resources.
1606:
1607: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1608: $it->{FIRST_RESOURCE},
1609: $it->{FINISH_RESOURCE},
1610: {}, undef, 1);
1611:
1612: my $depth = 0;
1613: $dfsit->next();
1614: my $curRes = $dfsit->next();
1615: while ($depth > -1) {
1616: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1617: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1618:
1619: if (ref($curRes)) {
1620: # Parallel pre-processing: Do sequences have non-filtered-out children?
1621: if ($curRes->is_map()) {
1622: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1623: # Sequences themselves do not count as visible children,
1624: # unless those sequences also have visible children.
1625: # This means if a sequence appears, there's a "promise"
1626: # that there's something under it if you open it, somewhere.
1627: } elsif ($curRes->src()) {
1628: # Not a sequence: if it's filtered, ignore it, otherwise
1629: # rise up the stack and mark the sequences as having children
1630: if (&$filterFunc($curRes)) {
1631: for my $sequence (@{$dfsit->getStack()}) {
1632: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1633: }
1634: }
1635: }
1636: }
1637: } continue {
1638: $curRes = $dfsit->next();
1639: }
1640:
1641: my $displayedJumpMarker = 0;
1642: # Set up iteration.
1643: my $now = time();
1644: my $in24Hours = $now + 24 * 60 * 60;
1645: my $rownum = 0;
1646:
1647: # export "here" marker information
1648: $args->{'here'} = $here;
1649:
1650: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1651: my @resources;
1652: my $code='';# sub { !(shift->is_map();) };
1653: if ($args->{'sort'} eq 'title') {
1654: my $oldFilterFunc = $filterFunc;
1655: my $filterFunc=
1656: sub {
1657: my ($res)=@_;
1658: if ($res->is_map()) { return 0;}
1659: return &$oldFilterFunc($res);
1660: };
1661: @resources=$navmap->retrieveResources(undef,$filterFunc);
1662: @resources= sort { &cmp_title($a,$b) } @resources;
1663: } elsif ($args->{'sort'} eq 'duedate') {
1664: my $oldFilterFunc = $filterFunc;
1665: my $filterFunc=
1666: sub {
1667: my ($res)=@_;
1668: if (!$res->is_problem()) { return 0;}
1669: return &$oldFilterFunc($res);
1670: };
1671: @resources=$navmap->retrieveResources(undef,$filterFunc);
1672: @resources= sort {
1673: if ($a->duedate ne $b->duedate) {
1674: return $a->duedate cmp $b->duedate;
1675: }
1676: my $value=&cmp_title($a,$b);
1677: return $value;
1678: } @resources;
1679: } elsif ($args->{'sort'} eq 'discussion') {
1680: my $oldFilterFunc = $filterFunc;
1681: my $filterFunc=
1682: sub {
1683: my ($res)=@_;
1684: if (!$res->hasDiscussion() &&
1685: !$res->getFeedback() &&
1686: !$res->getErrors()) { return 0;}
1687: return &$oldFilterFunc($res);
1688: };
1689: @resources=$navmap->retrieveResources(undef,$filterFunc);
1690: @resources= sort { &cmp_title($a,$b) } @resources;
1691: } else {
1692: #unknow sort mechanism or default
1693: undef($args->{'sort'});
1694: }
1695:
1696:
1697: while (1) {
1698: if ($args->{'sort'}) {
1699: $curRes = shift(@resources);
1700: } else {
1701: $curRes = $it->next($closeAllPages);
1702: }
1703: if (!$curRes) { last; }
1704:
1705: # Maintain indentation level.
1706: if ($curRes == $it->BEGIN_MAP() ||
1707: $curRes == $it->BEGIN_BRANCH() ) {
1708: $args->{'indentLevel'}++;
1709: }
1710: if ($curRes == $it->END_MAP() ||
1711: $curRes == $it->END_BRANCH() ) {
1712: $args->{'indentLevel'}--;
1713: }
1714: # Notice new branches
1715: if ($curRes == $it->BEGIN_BRANCH()) {
1716: $args->{'isNewBranch'} = 1;
1717: }
1718:
1719: # If this isn't an actual resource, continue on
1720: if (!ref($curRes)) {
1721: next;
1722: }
1723:
1724: # If this has been filtered out, continue on
1725: if (!(&$filterFunc($curRes))) {
1726: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1727: next;
1728: }
1729:
1730: # If this is an empty sequence and we're filtering them, continue on
1731: $args->{'mapHidden'} = 0;
1732: if (($curRes->is_map()) && (!$curRes->{DATA}->{HAS_VISIBLE_CHILDREN})) {
1733: if ($args->{'suppressEmptySequences'}) {
1734: next;
1735: } else {
1736: my $mapname = &Apache::lonnet::declutter($curRes->src());
1737: $mapname = &Apache::lonnet::deversion($mapname);
1738: if (lc($navmap->get_mapparam(undef,$mapname,"0.hiddenresource")) eq 'yes') {
1739: if ($userCanSeeHidden) {
1740: $args->{'mapHidden'} = 1;
1741: } else {
1742: next;
1743: }
1744: }
1745: }
1746: }
1747:
1748: # If we're suppressing navmaps and this is a navmap, continue on
1749: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1750: next;
1751: }
1752:
1753: $args->{'counter'}++;
1754:
1755: # Does it have multiple parts?
1756: $args->{'multipart'} = 0;
1757: $args->{'condensed'} = 0;
1758: my @parts;
1759:
1760: # Decide what parts to show.
1761: if ($curRes->is_problem() && $showParts) {
1762: @parts = @{$curRes->parts()};
1763: $args->{'multipart'} = $curRes->multipart();
1764:
1765: if ($condenseParts) { # do the condensation
1766: if (!$args->{'condensed'}) {
1767: # Decide whether to condense based on similarity
1768: my $status = $curRes->status($parts[0]);
1769: my $due = $curRes->duedate($parts[0]);
1770: my $open = $curRes->opendate($parts[0]);
1771: my $statusAllSame = 1;
1772: my $dueAllSame = 1;
1773: my $openAllSame = 1;
1774: for (my $i = 1; $i < scalar(@parts); $i++) {
1775: if ($curRes->status($parts[$i]) != $status){
1776: $statusAllSame = 0;
1777: }
1778: if ($curRes->duedate($parts[$i]) != $due ) {
1779: $dueAllSame = 0;
1780: }
1781: if ($curRes->opendate($parts[$i]) != $open) {
1782: $openAllSame = 0;
1783: }
1784: }
1785: # $*allSame is true if all the statuses were
1786: # the same. Now, if they are all the same and
1787: # match one of the statuses to condense, or they
1788: # are all open with the same due date, or they are
1789: # all OPEN_LATER with the same open date, display the
1790: # status of the first non-zero part (to get the 'correct'
1791: # status right, since 0 is never 'correct' or 'open').
1792: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1793: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1794: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1795: @parts = ($parts[0]);
1796: $args->{'condensed'} = 1;
1797: }
1798: }
1799: # Multipart problem with one part: always "condense" (happens
1800: # to match the desirable behavior)
1801: if ($curRes->countParts() == 1) {
1802: @parts = ($parts[0]);
1803: $args->{'condensed'} = 1;
1804: }
1805: }
1806: }
1807:
1808: # If the multipart problem was condensed, "forget" it was multipart
1809: if (scalar(@parts) == 1) {
1810: $args->{'multipart'} = 0;
1811: } else {
1812: # Add part 0 so we display it correctly.
1813: unshift @parts, '0';
1814: }
1815:
1816: {
1817: my ($src,$symb,$anchor,$stack);
1818: if ($args->{'sort'}) {
1819: my $it = $navmap->getIterator(undef, undef, undef, 1);
1820: while ( my $res=$it->next()) {
1821: if (ref($res) &&
1822: $res->symb() eq $curRes->symb()) { last; }
1823: }
1824: $stack=$it->getStack();
1825: } else {
1826: $stack=$it->getStack();
1827: }
1828: ($src,$symb,$anchor)=getLinkForResource($stack);
1829: my $srcHasQuestion = $src =~ /\?/;
1830: if (defined($anchor)) { $anchor='#'.$anchor; }
1831: if (($args->{'caller'} eq 'sequence') && ($curRes->is_map())) {
1832: $args->{"resourceLink"} = $src.($srcHasQuestion?'&':'?') .'navmap=1';
1833: } else {
1834: $args->{"resourceLink"} = $src.
1835: ($srcHasQuestion?'&':'?') .
1836: 'symb=' . &escape($symb).$anchor;
1837: }
1838: }
1839: # Now, we've decided what parts to show. Loop through them and
1840: # show them.
1841: foreach my $part (@parts) {
1842: $rownum ++;
1843:
1844: $result .= &Apache::loncommon::start_data_table_row();
1845:
1846: # Set up some data about the parts that the cols might want
1847: my $filter = $it->{FILTER};
1848:
1849: # Now, display each column.
1850: foreach my $col (@$cols) {
1851: my $colHTML = '';
1852: if (ref($col)) {
1853: $colHTML .= &$col($curRes, $part, $args);
1854: } else {
1855: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1856: }
1857:
1858: # If this is the first column and it's time to print
1859: # the anchor, do so
1860: if ($col == $cols->[0] &&
1861: $args->{'counter'} == $args->{'currentJumpIndex'} -
1862: $currentJumpDelta) {
1863: # Jam the anchor after the <td> tag;
1864: # necessary for valid HTML (which Mozilla requires)
1865: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1866: $displayedJumpMarker = 1;
1867: }
1868: $result .= $colHTML . "\n";
1869: }
1870: $result .= &Apache::loncommon::end_data_table_row();
1871: $args->{'isNewBranch'} = 0;
1872: }
1873:
1874: if ($r && $rownum % 20 == 0) {
1875: $r->print($result);
1876: $result = "";
1877: $r->rflush();
1878: }
1879: } continue {
1880: if ($r) {
1881: # If we have the connection, make sure the user is still connected
1882: my $c = $r->connection;
1883: if ($c->aborted()) {
1884: # Who cares what we do, nobody will see it anyhow.
1885: return '';
1886: }
1887: }
1888: }
1889:
1890: $result.=&Apache::loncommon::end_data_table();
1891:
1892: # Print out the part that jumps to #curloc if it exists
1893: # delay needed because the browser is processing the jump before
1894: # it finishes rendering, so it goes to the wrong place!
1895: # onload might be better, but this routine has no access to that.
1896: # On mozilla, the 0-millisecond timeout seems to prevent this;
1897: # it's quite likely this might fix other browsers, too, and
1898: # certainly won't hurt anything.
1899: if ($displayedJumpMarker) {
1900: $result .= &Apache::lonhtmlcommon::scripttag("
1901: if (location.href.indexOf('#curloc')==-1) {
1902: setTimeout(\"location += '#curloc';\", 0)
1903: }
1904: ");
1905: }
1906:
1907: if ($r) {
1908: $r->print($result);
1909: $result = "";
1910: $r->rflush();
1911: }
1912:
1913: return $result;
1914: }
1915:
1916: sub add_linkitem {
1917: my ($linkitems,$name,$cmd,$text)=@_;
1918: $$linkitems{$name}{'cmd'}=$cmd;
1919: $$linkitems{$name}{'text'}=&mt($text);
1920: }
1921:
1922: sub show_linkitems_toolbar {
1923: my ($args,$condition) = @_;
1924: my $result;
1925: if (ref($args) eq 'HASH') {
1926: if (ref($args->{'linkitems'}) eq 'HASH') {
1927: my $numlinks = scalar(keys(%{$args->{'linkitems'}}));
1928: if ($numlinks > 1) {
1929: $result = '<td>'.
1930: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',
1931: undef,'RAT').
1932: '</td>'.
1933: '<td> </td>'.
1934: '<td class="LC_middle">'.&mt('Tools:').'</td>';
1935: }
1936: $result .= '<td align="left">'."\n".
1937: '<ul id="LC_toolbar">';
1938: my @linkorder = ('firsthomework','everything','uncompleted',
1939: 'changefolder','clearbubbles','edittoplevel');
1940: foreach my $link (@linkorder) {
1941: if (ref($args->{'linkitems'}{$link}) eq 'HASH') {
1942: if ($args->{'linkitems'}{$link}{'text'} ne '') {
1943: $args->{'linkitems'}{$link}{'cmd'}=~s/"/'/g;
1944: if ($args->{'linkitems'}{$link}{'cmd'}) {
1945: my $link_id = 'LC_content_toolbar_'.$link;
1946: if ($link eq 'changefolder') {
1947: if ($condition) {
1948: $link_id='LC_content_toolbar_changefolder_toggled';
1949: } else {
1950: $link_id='LC_content_toolbar_changefolder';
1951: }
1952: }
1953: $result .= '<li><a href="#" '.
1954: 'onclick="'.$args->{'linkitems'}{$link}{'cmd'}.'" '.
1955: 'id="'.$link_id.'" '.
1956: 'class="LC_toolbarItem" '.
1957: 'title="'.$args->{'linkitems'}{$link}{'text'}.'">'.
1958: '</a></li>'."\n";
1959: }
1960: }
1961: }
1962: }
1963: $result .= '</ul>'.
1964: '</td>';
1965: if (($numlinks==1) && (exists($args->{'linkitems'}{'edittoplevel'}))) {
1966: $result .= '<td><a href="'.$args->{'linkitems'}{'edittoplevel'}{'cmd'}.'">'.
1967: &mt('Content Editor').'</a></td>';
1968: }
1969: }
1970: if ($args->{'sort_html'}) {
1971: $result .= '<td> </td><td> </td><td> </td>'.
1972: '<td align="right">'.$args->{'sort_html'}.'</td>';
1973: }
1974: }
1975: if ($result) {
1976: $result = "<table><tr>$result</tr></table>";
1977: }
1978: return $result;
1979: }
1980:
1981: 1;
1982:
1983:
1984:
1985:
1986:
1987:
1988:
1989:
1990:
1991: package Apache::lonnavmaps::navmap;
1992:
1993: =pod
1994:
1995: =head1 Object: Apache::lonnavmaps::navmap
1996:
1997: =head2 Overview
1998:
1999: The navmap object's job is to provide access to the resources
2000: in the course as Apache::lonnavmaps::resource objects, and to
2001: query and manage the relationship between those resource objects.
2002:
2003: Generally, you'll use the navmap object in one of three basic ways.
2004: In order of increasing complexity and power:
2005:
2006: =over 4
2007:
2008: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
2009: various ways to obtain resource objects, based on various identifiers.
2010: Use this when you want to request information about one object or
2011: a handful of resources you already know the identities of, from some
2012: other source. For more about Ids, Symbs, and MapPcs, see the
2013: Resource documentation. Note that Url should be a B<last resort>,
2014: not your first choice; it only really works when there is only one
2015: instance of the resource in the course, which only applies to
2016: maps, and even that may change in the future (see the B<getResourceByUrl>
2017: documentation for more details.)
2018:
2019: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2020: retrieves resources matching some criterion and returns them
2021: in a flat array, with no structure information. Use this when
2022: you are manipulating a series of resources, based on what map
2023: the are in, but do not care about branching, or exactly how
2024: the maps and resources are related. This is the most common case.
2025:
2026: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2027: the course's navmap in various ways without writing the traversal
2028: code yourself. See iterator documentation below. Use this when
2029: you need to know absolutely everything about the course, including
2030: branches and the precise relationship between maps and resources.
2031:
2032: =back
2033:
2034: =head2 Creation And Destruction
2035:
2036: To create a navmap object, use the following function:
2037:
2038: =over 4
2039:
2040: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2041:
2042: Creates a new navmap object. Returns the navmap object if this is
2043: successful, or B<undef> if not.
2044:
2045: =back
2046:
2047: =head2 Methods
2048:
2049: =over 4
2050:
2051: =item * B<getIterator>(first, finish, filter, condition):
2052:
2053: See iterator documentation below.
2054:
2055: =cut
2056:
2057: use strict;
2058: use GDBM_File;
2059: use Apache::lonnet;
2060: use LONCAPA;
2061:
2062: sub new {
2063: # magic invocation to create a class instance
2064: my $proto = shift;
2065: my $class = ref($proto) || $proto;
2066: my $self = {};
2067: bless($self); # So we can call change_user if necessary
2068:
2069: $self->{USERNAME} = shift || $env{'user.name'};
2070: $self->{DOMAIN} = shift || $env{'user.domain'};
2071: $self->{CODE} = shift;
2072: $self->{NOHIDE} = shift;
2073:
2074:
2075:
2076: # Resource cache stores navmap resources as we reference them. We generate
2077: # them on-demand so we don't pay for creating resources unless we use them.
2078: $self->{RESOURCE_CACHE} = {};
2079:
2080: # Network failure flag, if we accessed the course or user opt and
2081: # failed
2082: $self->{NETWORK_FAILURE} = 0;
2083:
2084: # We can only tie the nav hash as done below if the username/domain
2085: # match the env one. Otherwise change_user does everything we need...since we can't
2086: # assume there are course hashes for the specific requested user:domain
2087: # Note: change_user is also called if we need the nav hash when printing CODEd
2088: # assignments or printing an exam, in which the enclosing folder for the items in
2089: # the exam has hidden set.
2090: #
2091:
2092: if (($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'}) &&
2093: !$self->{CODE} && !$self->{NOHIDE}) {
2094:
2095: # tie the nav hash
2096:
2097: my %navmaphash;
2098: my %parmhash;
2099: my $courseFn = $env{"request.course.fn"};
2100: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2101: &GDBM_READER(), 0640))) {
2102: return undef;
2103: }
2104:
2105: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2106: &GDBM_READER(), 0640)))
2107: {
2108: untie %{$self->{PARM_HASH}};
2109: return undef;
2110: }
2111:
2112: $self->{NAV_HASH} = \%navmaphash;
2113: $self->{PARM_HASH} = \%parmhash;
2114: $self->{PARM_CACHE} = {};
2115: } else {
2116: $self->change_user($self->{USERNAME}, $self->{DOMAIN}, $self->{CODE}, $self->{NOHIDE});
2117: }
2118:
2119: return $self;
2120: }
2121:
2122: #
2123: # In some instances it is useful to be able to dynamically change the
2124: # username/domain associated with a navmap (e.g. to navigate for someone
2125: # else besides the current user...if sufficiently privileged.
2126: # Parameters:
2127: # user - New user.
2128: # domain- Domain the user belongs to.
2129: # code - Anonymous CODE in use.
2130: # Implicit inputs:
2131: #
2132: sub change_user {
2133: my $self = shift;
2134: $self->{USERNAME} = shift;
2135: $self->{DOMAIN} = shift;
2136: $self->{CODE} = shift;
2137: $self->{NOHIDE} = shift;
2138:
2139: # If the hashes are already tied make sure to break that bond:
2140:
2141: untie %{$self->{NAV_HASH}};
2142: untie %{$self->{PARM_HASH}};
2143:
2144: # The assumption is that we have to
2145: # use lonmap here to re-read the hash and from it reconstruct
2146: # new big and parameter hashes. An implicit assumption at this time
2147: # is that the course file is probably not created locally yet
2148: # an that we will therefore just read without tying.
2149:
2150: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2151:
2152: my %big_hash;
2153: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, $self->{CODE}, $self->{NOHIDE}, \%big_hash);
2154: $self->{NAV_HASH} = \%big_hash;
2155:
2156:
2157:
2158: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2159: # param.xxxx keys.
2160:
2161: $self->{PARM_CACHE} = {};
2162:
2163: my %parm_hash = {};
2164: foreach my $key (keys(%big_hash)) {
2165: if ($key =~ /^param\./) {
2166: my $param_key = $key;
2167: $param_key =~ s/^param\.//;
2168: $parm_hash{$param_key} = $big_hash{$key};
2169: }
2170: }
2171:
2172: $self->{PARM_HASH} = \%parm_hash;
2173:
2174: }
2175:
2176: sub generate_course_user_opt {
2177: my $self = shift;
2178: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2179:
2180: my $uname=$self->{USERNAME};
2181: my $udom=$self->{DOMAIN};
2182:
2183: my $cid=$env{'request.course.id'};
2184: my $cdom=$env{'course.'.$cid.'.domain'};
2185: my $cnum=$env{'course.'.$cid.'.num'};
2186:
2187: # ------------------------------------------------- Get coursedata (if present)
2188: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2189: # Check for network failure
2190: if (!ref($courseopt)) {
2191: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2192: $self->{NETWORK_FAILURE} = 1;
2193: }
2194: undef($courseopt);
2195: }
2196:
2197: # --------------------------------------------------- Get userdata (if present)
2198:
2199: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2200: # Check for network failure
2201: if (!ref($useropt)) {
2202: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2203: $self->{NETWORK_FAILURE} = 1;
2204: }
2205: undef($useropt);
2206: }
2207:
2208: $self->{COURSE_OPT} = $courseopt;
2209: $self->{USER_OPT} = $useropt;
2210:
2211: $self->{COURSE_USER_OPT_GENERATED} = 1;
2212:
2213: return;
2214: }
2215:
2216:
2217:
2218: sub generate_email_discuss_status {
2219: my $self = shift;
2220: my $symb = shift;
2221: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2222:
2223: my $cid=$env{'request.course.id'};
2224: my $cdom=$env{'course.'.$cid.'.domain'};
2225: my $cnum=$env{'course.'.$cid.'.num'};
2226:
2227: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2228: my $logoutTime = $emailstatus{'logout'};
2229: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2230: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2231: $courseLeaveTime : $logoutTime);
2232: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2233: $cdom, $cnum);
2234: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2235: $self->{DOMAIN},$self->{USERNAME},'lastread');
2236: my %lastreadtime = ();
2237: foreach my $key (keys(%lastread)) {
2238: my $shortkey = $key;
2239: $shortkey =~ s/_lastread$//;
2240: $lastreadtime{$shortkey} = $lastread{$key};
2241: }
2242:
2243: my %feedback=();
2244: my %error=();
2245: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2246: $self->{USERNAME});
2247:
2248: foreach my $msgid (@keys) {
2249: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2250: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2251: $symb,$error) = &Apache::lonmsg::unpackmsgid(&LONCAPA::escape($msgid));
2252: &Apache::lonenc::check_decrypt(\$symb);
2253: if (($fromcid ne '') && ($fromcid ne $cid)) {
2254: next;
2255: }
2256: if (defined($symb)) {
2257: if (defined($error) && $error == 1) {
2258: $error{$symb}.=','.$msgid;
2259: } else {
2260: $feedback{$symb}.=','.$msgid;
2261: }
2262: } else {
2263: my $plain=
2264: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2265: if ($plain=~/ \[([^\]]+)\]\:/) {
2266: my $url=$1;
2267: if ($plain=~/\:Error \[/) {
2268: $error{$url}.=','.$msgid;
2269: } else {
2270: $feedback{$url}.=','.$msgid;
2271: }
2272: }
2273: }
2274: }
2275: }
2276:
2277: #symbs of resources that have feedbacks (will be urls pre-2.3)
2278: $self->{FEEDBACK} = \%feedback;
2279: #or errors (will be urls pre 2.3)
2280: $self->{ERROR_MSG} = \%error;
2281: $self->{DISCUSSION_TIME} = \%discussiontime;
2282: $self->{EMAIL_STATUS} = \%emailstatus;
2283: $self->{LAST_READ} = \%lastreadtime;
2284:
2285: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2286: }
2287:
2288: sub get_user_data {
2289: my $self = shift;
2290: if ($self->{RETRIEVED_USER_DATA}) { return; }
2291:
2292: # Retrieve performance data on problems
2293: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2294: $self->{DOMAIN},
2295: $self->{USERNAME});
2296: $self->{STUDENT_DATA} = \%student_data;
2297:
2298: $self->{RETRIEVED_USER_DATA} = 1;
2299: }
2300:
2301: sub get_discussion_data {
2302: my $self = shift;
2303: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2304: return $self->{DISCUSSION_DATA};
2305: }
2306:
2307: $self->generate_email_discuss_status();
2308:
2309: my $cid=$env{'request.course.id'};
2310: my $cdom=$env{'course.'.$cid.'.domain'};
2311: my $cnum=$env{'course.'.$cid.'.num'};
2312: # Retrieve discussion data for resources in course
2313: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2314:
2315:
2316: $self->{DISCUSSION_DATA} = \%discussion_data;
2317: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2318: return $self->{DISCUSSION_DATA};
2319: }
2320:
2321:
2322: # Internal function: Takes a key to look up in the nav hash and implements internal
2323: # memory caching of that key.
2324: sub navhash {
2325: my $self = shift; my $key = shift;
2326: return $self->{NAV_HASH}->{$key};
2327: }
2328:
2329: =pod
2330:
2331: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2332: false otherwise. Undefined course maps indicate an error somewhere in
2333: LON-CAPA, and you will not be able to proceed with using the navmap.
2334: See the B<NAV> screen for an example of using this.
2335:
2336: =cut
2337:
2338: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2339: sub courseMapDefined {
2340: my $self = shift;
2341: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2342:
2343: my $firstres = $self->navhash("map_start_$uri");
2344: my $lastres = $self->navhash("map_finish_$uri");
2345: return $firstres && $lastres;
2346: }
2347:
2348: sub getIterator {
2349: my $self = shift;
2350: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2351: shift, undef, shift,
2352: shift, shift);
2353: return $iterator;
2354: }
2355:
2356: # Private method: Does the given resource (as a symb string) have
2357: # current discussion? Returns 0 if chat/mail data not extracted.
2358: sub hasDiscussion {
2359: my $self = shift;
2360: my $symb = shift;
2361: $self->generate_email_discuss_status();
2362:
2363: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2364:
2365: #return defined($self->{DISCUSSION_TIME}->{$symb});
2366:
2367: # backward compatibility (bulletin boards used to be 'wrapped')
2368: my $ressymb = $self->wrap_symb($symb);
2369: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2370: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2371: } else {
2372: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2373: 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).
2374: }
2375: }
2376:
2377: sub last_post_time {
2378: my $self = shift;
2379: my $symb = shift;
2380: my $ressymb = $self->wrap_symb($symb);
2381: return $self->{DISCUSSION_TIME}->{$ressymb};
2382: }
2383:
2384: sub discussion_info {
2385: my $self = shift;
2386: my $symb = shift;
2387: my $filter = shift;
2388:
2389: $self->get_discussion_data();
2390:
2391: my $ressymb = $self->wrap_symb($symb);
2392: # keys used to store bulletinboard postings use 'unwrapped' symb.
2393: my $discsymb = &escape($self->unwrap_symb($ressymb));
2394: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2395: if (!$version) { return; }
2396:
2397: my $prevread = $self->{LAST_READ}{$ressymb};
2398:
2399: my $count = 0;
2400: my $hiddenflag = 0;
2401: my $deletedflag = 0;
2402: my ($hidden,$deleted,%info);
2403:
2404: for (my $id=$version; $id>0; $id--) {
2405: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2406: my @keys=split(/:/,$vkeys);
2407: if (grep(/^hidden$/ ,@keys)) {
2408: if (!$hiddenflag) {
2409: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2410: $hiddenflag = 1;
2411: }
2412: } elsif (grep(/^deleted$/,@keys)) {
2413: if (!$deletedflag) {
2414: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2415: $deletedflag = 1;
2416: }
2417: } else {
2418: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2419: if ($filter eq 'unread') {
2420: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2421: next;
2422: }
2423: }
2424: $count++;
2425: $info{$count}{'subject'} =
2426: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2427: $info{$count}{'id'} = $id;
2428: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2429: }
2430: }
2431: }
2432: if (wantarray) {
2433: return ($count,%info);
2434: }
2435: return $count;
2436: }
2437:
2438: sub wrap_symb {
2439: my $self = shift;
2440: my $symb = shift;
2441: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2442: unless ($symb =~ m|adm/wrapper/adm|) {
2443: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2444: }
2445: }
2446: return $symb;
2447: }
2448:
2449: sub unwrap_symb {
2450: my $self = shift;
2451: my $ressymb = shift;
2452: my $discsymb = $ressymb;
2453: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2454: $discsymb = $1.$2;
2455: }
2456: return $discsymb;
2457: }
2458:
2459: # Private method: Does the given resource (as a symb string) have
2460: # current feedback? Returns the string in the feedback hash, which
2461: # will be false if it does not exist.
2462:
2463: sub getFeedback {
2464: my $self = shift;
2465: my $symb = shift;
2466: my $source = shift;
2467:
2468: $self->generate_email_discuss_status();
2469:
2470: if (!defined($self->{FEEDBACK})) { return ""; }
2471:
2472: my $feedback;
2473: if ($self->{FEEDBACK}->{$symb}) {
2474: $feedback = $self->{FEEDBACK}->{$symb};
2475: if ($self->{FEEDBACK}->{$source}) {
2476: $feedback .= ','.$self->{FEEDBACK}->{$source};
2477: }
2478: } else {
2479: if ($self->{FEEDBACK}->{$source}) {
2480: $feedback = $self->{FEEDBACK}->{$source};
2481: }
2482: }
2483: return $feedback;
2484: }
2485:
2486: # Private method: Get the errors for that resource (by source).
2487: sub getErrors {
2488: my $self = shift;
2489: my $symb = shift;
2490: my $src = shift;
2491:
2492: $self->generate_email_discuss_status();
2493:
2494: if (!defined($self->{ERROR_MSG})) { return ""; }
2495:
2496: my $errors;
2497: if ($self->{ERROR_MSG}->{$symb}) {
2498: $errors = $self->{ERROR_MSG}->{$symb};
2499: if ($self->{ERROR_MSG}->{$src}) {
2500: $errors .= ','.$self->{ERROR_MSG}->{$src};
2501: }
2502: } else {
2503: if ($self->{ERROR_MSG}->{$src}) {
2504: $errors = $self->{ERROR_MSG}->{$src};
2505: }
2506: }
2507: return $errors;
2508: }
2509:
2510: =pod
2511:
2512: =item * B<getById>(id):
2513:
2514: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2515: object for that resource. This method, or other methods that use it
2516: (as in the resource object) is the only proper way to obtain a
2517: resource object.
2518:
2519: =item * B<getBySymb>(symb):
2520:
2521: Based on the symb of the resource, get a resource object for that
2522: resource. This is one of the proper ways to get a resource object.
2523:
2524: =item * B<getByMapPc>(map_pc):
2525:
2526: Based on the map_pc of the resource, get a resource object for
2527: the given map. This is one of the proper ways to get a resource object.
2528:
2529: =cut
2530:
2531: # The strategy here is to cache the resource objects, and only construct them
2532: # as we use them. The real point is to prevent reading any more from the tied
2533: # hash than we have to, which should hopefully alleviate speed problems.
2534:
2535: sub getById {
2536: my $self = shift;
2537: my $id = shift;
2538:
2539: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2540: {
2541: return $self->{RESOURCE_CACHE}->{$id};
2542: }
2543:
2544: # resource handles inserting itself into cache.
2545: # Not clear why the quotes are necessary, but as of this
2546: # writing it doesn't work without them.
2547: return "Apache::lonnavmaps::resource"->new($self, $id);
2548: }
2549:
2550: sub getBySymb {
2551: my $self = shift;
2552: my $symb = shift;
2553:
2554: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2555: my $map = $self->getResourceByUrl($mapUrl);
2556: my $returnvalue = undef;
2557: if (ref($map)) {
2558: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2559: }
2560: return $returnvalue;
2561: }
2562:
2563: sub getByMapPc {
2564: my $self = shift;
2565: my $map_pc = shift;
2566: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2567: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2568: return $self->getById($map_id);
2569: }
2570:
2571: =pod
2572:
2573: =item * B<firstResource>():
2574:
2575: Returns a resource object reference corresponding to the first
2576: resource in the navmap.
2577:
2578: =cut
2579:
2580: sub firstResource {
2581: my $self = shift;
2582: my $firstResource = $self->navhash('map_start_' .
2583: &Apache::lonnet::clutter($env{'request.course.uri'}));
2584: return $self->getById($firstResource);
2585: }
2586:
2587: =pod
2588:
2589: =item * B<finishResource>():
2590:
2591: Returns a resource object reference corresponding to the last resource
2592: in the navmap.
2593:
2594: =cut
2595:
2596: sub finishResource {
2597: my $self = shift;
2598: my $firstResource = $self->navhash('map_finish_' .
2599: &Apache::lonnet::clutter($env{'request.course.uri'}));
2600: return $self->getById($firstResource);
2601: }
2602:
2603: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2604: # the actual lookup; parmval caches the results.
2605: sub parmval {
2606: my $self = shift;
2607: my ($what,$symb,$recurse)=@_;
2608: my $hashkey = $what."|||".$symb;
2609: my $cache = $self->{PARM_CACHE};
2610: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2611: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2612: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2613: if (wantarray) {
2614: return @{$self->{PARM_CACHE}->{$hashkey}};
2615: } else {
2616: return $self->{PARM_CACHE}->{$hashkey}->[0];
2617: }
2618: }
2619: } else {
2620: return $self->{PARM_CACHE}->{$hashkey};
2621: }
2622: }
2623: my $result = $self->parmval_real($what, $symb, $recurse);
2624: $self->{PARM_CACHE}->{$hashkey} = $result;
2625: if (wantarray) {
2626: return @{$result};
2627: }
2628: return $result->[0];
2629: }
2630:
2631:
2632: sub parmval_real {
2633: my $self = shift;
2634: my ($what,$symb,$recurse) = @_;
2635:
2636:
2637: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2638: $self->generate_course_user_opt();
2639:
2640: my $cid=$env{'request.course.id'};
2641: my $csec=$env{'request.course.sec'};
2642: my $cgroup='';
2643: my @cgrps=split(/:/,$env{'request.course.groups'});
2644: if (@cgrps > 0) {
2645: @cgrps = sort(@cgrps);
2646: $cgroup = $cgrps[0];
2647: }
2648: my $uname=$self->{USERNAME};
2649: my $udom=$self->{DOMAIN};
2650:
2651: unless ($symb) { return ['']; }
2652: my $result='';
2653:
2654: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2655: $mapname = &Apache::lonnet::deversion($mapname);
2656: # ----------------------------------------------------- Cascading lookup scheme
2657: my $rwhat=$what;
2658: $what=~s/^parameter\_//;
2659: $what=~s/\_/\./;
2660:
2661: my $symbparm=$symb.'.'.$what;
2662: my $mapparm=$mapname.'___(all).'.$what;
2663: my $usercourseprefix=$cid;
2664:
2665:
2666:
2667: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2668: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2669: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2670:
2671:
2672: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2673: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2674: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2675:
2676:
2677: my $courselevel= $usercourseprefix.'.'.$what;
2678: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2679: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2680:
2681:
2682: my $useropt = $self->{USER_OPT};
2683: my $courseopt = $self->{COURSE_OPT};
2684: my $parmhash = $self->{PARM_HASH};
2685:
2686: # ---------------------------------------------------------- first, check user
2687: if ($uname and defined($useropt)) {
2688: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2689: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2690: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2691: }
2692:
2693: # ------------------------------------------------------- second, check course
2694: if ($cgroup ne '' and defined($courseopt)) {
2695: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2696: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2697: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2698: }
2699:
2700: if ($csec and defined($courseopt)) {
2701: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2702: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2703: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2704: }
2705:
2706: if (defined($courseopt)) {
2707: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2708: }
2709:
2710: # ----------------------------------------------------- third, check map parms
2711:
2712: my $thisparm=$$parmhash{$symbparm};
2713: if (defined($thisparm)) { return [$thisparm,'map']; }
2714:
2715: # ----------------------------------------------------- fourth , check default
2716:
2717: my $meta_rwhat=$rwhat;
2718: $meta_rwhat=~s/\./_/g;
2719: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2720: if (defined($default)) { return [$default,'resource']}
2721: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2722: if (defined($default)) { return [$default,'resource']}
2723: # --------------------------------------------------- fifth, check more course
2724: if (defined($courseopt)) {
2725: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2726: if (defined($$courseopt{$courselevel})) {
2727: my $ret = [$$courseopt{$courselevel},'course'];
2728: return $ret;
2729: }
2730: }
2731: # --------------------------------------------------- sixth , cascade up parts
2732:
2733: my ($space,@qualifier)=split(/\./,$rwhat);
2734: my $qualifier=join('.',@qualifier);
2735: unless ($space eq '0') {
2736: my @parts=split(/_/,$space);
2737: my $id=pop(@parts);
2738: my $part=join('_',@parts);
2739: if ($part eq '') { $part='0'; }
2740: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2741: if (defined($partgeneral[0])) { return \@partgeneral; }
2742: }
2743: if ($recurse) { return []; }
2744: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2745: if (defined($pack_def)) { return [$pack_def,'resource']; }
2746: return [''];
2747: }
2748:
2749: sub recurseup_maps {
2750: my ($self,$mapname) = @_;
2751: my @recurseup;
2752: if ($mapname) {
2753: my $res = $self->getResourceByUrl($mapname);
2754: if (ref($res)) {
2755: my @pcs = split(/,/,$res->map_hierarchy());
2756: shift(@pcs);
2757: if (@pcs) {
2758: @recurseup = map { &Apache::lonnet::declutter($self->getByMapPc($_)->src()); } reverse(@pcs);
2759: }
2760: }
2761: }
2762: return @recurseup;
2763: }
2764:
2765: sub recursed_crumbs {
2766: my ($self,$mapurl,$restitle) = @_;
2767: my (@revmapinfo,@revmapres);
2768: my $mapres = $self->getResourceByUrl($mapurl);
2769: if (ref($mapres)) {
2770: @revmapres = map { $self->getByMapPc($_); } split(/,/,$mapres->map_breadcrumbs());
2771: shift(@revmapres);
2772: }
2773: my $allowedlength = 60;
2774: my $minlength = 5;
2775: my $allowedtitle = 30;
2776: if (($env{'environment.icons'} eq 'iconsonly') && (!$env{'browser.mobile'})) {
2777: $allowedlength = 100;
2778: $allowedtitle = 70;
2779: }
2780: if (length($restitle) > $allowedtitle) {
2781: $restitle = &truncate_crumb_text($restitle,$allowedtitle);
2782: }
2783: my $totallength = length($restitle);
2784: my @links;
2785:
2786: foreach my $map (@revmapres) {
2787: my $pc = $map->map_pc();
2788: next if ((!$pc) || ($pc == 1));
2789: push(@links,$map);
2790: push(@revmapinfo,{'href' => $map->link().'?navmap=1','text' => $map->title(),'no_mt' => 1,});
2791: $totallength += length($map->title());
2792: }
2793: my $numlinks = scalar(@links);
2794: if ($numlinks) {
2795: if ($totallength - $allowedlength > 0) {
2796: my $available = $allowedlength - length($restitle);
2797: my $avg = POSIX::ceil($available/$numlinks);
2798: if ($avg < $minlength) {
2799: $avg = $minlength;
2800: }
2801: @revmapinfo = ();
2802: foreach my $map (@links) {
2803: my $showntitle = &truncate_crumb_text($map->title(),$avg);
2804: if ($showntitle ne '') {
2805: push(@revmapinfo,{'href' => $map->link().'?navmap=1','text' => $showntitle,'no_mt' => 1,});
2806: }
2807: }
2808: }
2809: }
2810: if ($restitle ne '') {
2811: push(@revmapinfo,{'text' => $restitle, 'no_mt' => 1});
2812: }
2813: return @revmapinfo;
2814: }
2815:
2816: sub truncate_crumb_text {
2817: my ($title,$limit) = @_;
2818: my $showntitle = '';
2819: if (length($title) > $limit) {
2820: my @words = split(/\b\s*/,$title);
2821: if (@words == 1) {
2822: $showntitle = substr($title,0,$limit).' ...';
2823: } else {
2824: my $linklength = 0;
2825: my $num = 0;
2826: foreach my $word (@words) {
2827: $linklength += 1+length($word);
2828: if ($word eq '-') {
2829: $showntitle =~ s/ $//;
2830: $showntitle .= $word;
2831: } elsif ($linklength > $limit) {
2832: if ($num < @words) {
2833: $showntitle .= $word.' ...';
2834: last;
2835: } else {
2836: $showntitle .= $word;
2837: }
2838: } else {
2839: $showntitle .= $word.' ';
2840: }
2841: }
2842: $showntitle =~ s/ $//;
2843: }
2844: return $showntitle;
2845: } else {
2846: return $title;
2847: }
2848: }
2849:
2850: #
2851: # Determines the open/close dates for printing a map that
2852: # encloses a resource.
2853: #
2854: sub map_printdates {
2855: my ($self, $res, $part) = @_;
2856:
2857:
2858:
2859:
2860:
2861: my $opendate = $self->get_mapparam($res->symb(),'',"$part.printstartdate");
2862: my $closedate= $self->get_mapparam($res->symb(),'', "$part.printenddate");
2863:
2864:
2865: return ($opendate, $closedate);
2866: }
2867:
2868: sub get_mapparam {
2869: my ($self, $symb, $mapname, $what) = @_;
2870:
2871: # Ensure the course option hash is populated:
2872:
2873: $self->generate_course_user_opt();
2874:
2875: # Get the course id and section if there is one.
2876:
2877: my $cid=$env{'request.course.id'};
2878: my $csec=$env{'request.course.sec'};
2879: my $cgroup='';
2880: my @cgrps=split(/:/,$env{'request.course.groups'});
2881: if (@cgrps > 0) {
2882: @cgrps = sort(@cgrps);
2883: $cgroup = $cgrps[0];
2884: }
2885: my $uname=$self->{USERNAME};
2886: my $udom=$self->{DOMAIN};
2887:
2888: unless ($symb || $mapname) { return; }
2889: my $result='';
2890: my ($recursed,@recurseup);
2891:
2892: # Figure out which map we are in.
2893:
2894: if ($symb && !$mapname) {
2895: my ($id,$fn);
2896: ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2897: $mapname = &Apache::lonnet::deversion($mapname);
2898: }
2899:
2900: my $rwhat=$what;
2901: $what=~s/^parameter\_//;
2902: $what=~s/\_/\./;
2903:
2904: # Build the hash keys for the lookup:
2905:
2906: my $symbparm=$symb.'.'.$what;
2907: my $mapparm=$mapname.'___(all).'.$what;
2908: my $usercourseprefix=$cid;
2909:
2910:
2911: my $grplevel = "$usercourseprefix.[$cgroup].$mapparm";
2912: my $seclevel = "$usercourseprefix.[$csec].$mapparm";
2913: my $courselevel = "$usercourseprefix.$mapparm";
2914:
2915:
2916: # Get handy references to the hashes we need in $self:
2917:
2918: my $useropt = $self->{USER_OPT};
2919: my $courseopt = $self->{COURSE_OPT};
2920: my $parmhash = $self->{PARM_HASH};
2921:
2922: # Check per user
2923:
2924:
2925:
2926: if ($uname and defined($useropt)) {
2927: if (defined($$useropt{$courselevel})) {
2928: return $$useropt{$courselevel};
2929: }
2930: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2931: unless ($recursed) {
2932: @recurseup = $self->recurseup_maps($mapname);
2933: $recursed = 1;
2934: }
2935: foreach my $item (@recurseup) {
2936: my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
2937: if (defined($$useropt{$norecursechk})) {
2938: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2939: return $$useropt{$norecursechk};
2940: }
2941: }
2942: }
2943: }
2944: }
2945:
2946: # Check course -- group
2947:
2948:
2949:
2950: if ($cgroup ne '' and defined ($courseopt)) {
2951: if (defined($$courseopt{$grplevel})) {
2952: return $$courseopt{$grplevel};
2953: }
2954: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2955: unless ($recursed) {
2956: @recurseup = $self->recurseup_maps($mapname);
2957: $recursed = 1;
2958: }
2959: foreach my $item (@recurseup) {
2960: my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
2961: if (defined($$courseopt{$norecursechk})) {
2962: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2963: return $$courseopt{$norecursechk};
2964: }
2965: }
2966: }
2967: }
2968: }
2969:
2970: # Check course -- section
2971:
2972:
2973:
2974:
2975:
2976: if ($csec and defined($courseopt)) {
2977: if (defined($$courseopt{$seclevel})) {
2978: return $$courseopt{$seclevel};
2979: }
2980: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2981: unless ($recursed) {
2982: @recurseup = $self->recurseup_maps($mapname);
2983: $recursed = 1;
2984: }
2985: foreach my $item (@recurseup) {
2986: my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
2987: if (defined($$courseopt{$norecursechk})) {
2988: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2989: return $$courseopt{$norecursechk};
2990: }
2991: }
2992: }
2993: }
2994: }
2995: # Check the map parameters themselves:
2996:
2997: if ($symb) {
2998: my $symbparm=$symb.'.'.$what;
2999: my $thisparm = $$parmhash{$symbparm};
3000: if (defined($thisparm)) {
3001: return $thisparm;
3002: }
3003: }
3004:
3005:
3006: # Additional course parameters:
3007:
3008: if (defined($courseopt)) {
3009: if (defined($$courseopt{$courselevel})) {
3010: return $$courseopt{$courselevel};
3011: }
3012: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
3013: unless ($recursed) {
3014: @recurseup = $self->recurseup_maps($mapname);
3015: $recursed = 1;
3016: }
3017: foreach my $item (@recurseup) {
3018: my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
3019: if (defined($$courseopt{$norecursechk})) {
3020: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
3021: return $$courseopt{$norecursechk};
3022: }
3023: }
3024: }
3025: }
3026: }
3027: return undef; # Unefined if we got here.
3028: }
3029:
3030: sub course_printdates {
3031: my ($self, $symb, $part) = @_;
3032:
3033:
3034: my $opendate = $self->getcourseparam($symb, $part . '.printstartdate');
3035: my $closedate = $self->getcourseparam($symb, $part . '.printenddate');
3036: return ($opendate, $closedate);
3037:
3038: }
3039:
3040: sub getcourseparam {
3041: my ($self, $symb, $what) = @_;
3042:
3043: $self->generate_course_user_opt(); # If necessary populate the hashes.
3044:
3045: my $uname = $self->{USERNAME};
3046: my $udom = $self->{DOMAIN};
3047:
3048: # Course, section, group ids come from the env:
3049:
3050: my $cid = $env{'request.course.id'};
3051: my $csec = $env{'request.course.sec'};
3052: my $cgroup = ''; # Assume no group
3053:
3054: my @cgroups = split(/:/, $env{'request.course.groups'});
3055: if(@cgroups > 0) {
3056: @cgroups = sort(@cgroups);
3057: $cgroup = $cgroups[0]; # There is a course group.
3058: }
3059: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
3060: $mapname = &Apache::lonnet::deversion($mapname);
3061:
3062: #
3063: # Make the various lookup keys:
3064: #
3065:
3066: $what=~s/^parameter\_//;
3067: $what=~s/\_/\./;
3068:
3069:
3070: my $symbparm = $symb . '.' . $what;
3071: my $mapparm=$mapname.'___(all).'.$what;
3072:
3073: # Local refs to the hashes we're going to look at:
3074:
3075: my $useropt = $self->{USER_OPT};
3076: my $courseopt = $self->{COURSE_OPT};
3077:
3078: #
3079: # We want the course level stuff from the way
3080: # parmval_real operates
3081: # TODO: Factor some of this stuff out of
3082: # both parmval_real and here
3083: #
3084: my $courselevel = $cid . '.' . $what;
3085: my $grplevel = $cid . '.[' . $cgroup . ']' . $what;
3086: my $seclevel = $cid . '.[' . $csec . ']' . $what;
3087:
3088:
3089: # Try for the user's course level option:
3090:
3091: if ($uname and defined($useropt)) {
3092: if (defined($$useropt{$courselevel})) {
3093: return $$useropt{$courselevel};
3094: }
3095: }
3096: # Try for the group's course level option:
3097:
3098: if ($cgroup ne '' and defined($courseopt)) {
3099: if (defined($$courseopt{$grplevel})) {
3100: return $$courseopt{$grplevel};
3101: }
3102: }
3103:
3104: # Try for section level parameters:
3105:
3106: if ($csec ne '' and defined($courseopt)) {
3107: if (defined($$courseopt{$seclevel})) {
3108: return $$courseopt{$seclevel};
3109: }
3110: }
3111: # Try for 'additional' course parameters:
3112:
3113: if (defined($courseopt)) {
3114: if (defined($$courseopt{$courselevel})) {
3115: return $$courseopt{$courselevel};
3116: }
3117: }
3118: return undef;
3119:
3120: }
3121:
3122:
3123: =pod
3124:
3125: =item * B<getResourceByUrl>(url,multiple):
3126:
3127: Retrieves a resource object by URL of the resource, unless the optional
3128: multiple parameter is included in which case an array of resource
3129: objects is returned. If passed a resource object, it will simply return
3130: it, so it is safe to use this method in code like
3131: "$res = $navmap->getResourceByUrl($res)"
3132: if you're not sure if $res is already an object, or just a URL. If the
3133: resource appears multiple times in the course, only the first instance
3134: will be returned (useful for maps), unless the multiple parameter has
3135: been included, in which case all instances are returned in an array.
3136:
3137: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall, noblockcheck):
3138:
3139: The map is a specification of a map to retreive the resources from,
3140: either as a url or as an object. The filterFunc is a reference to a
3141: function that takes a resource object as its one argument and returns
3142: true if the resource should be included, or false if it should not
3143: be. If recursive is true, the map will be recursively examined,
3144: otherwise it will not be. If bailout is true, the function will return
3145: as soon as it finds a resource, if false it will finish. If showall is
3146: true it will not hide maps that contain nothing but one other map. The
3147: noblockcheck arg is propagated to become the sixth arg in the call to
3148: lonnet::allowed when checking a resource's availability during collection
3149: of resources using the iterator. noblockcheck needs to be true if
3150: retrieveResources() was called by a routine that itself was called by
3151: lonnet::allowed, in order to avoid recursion. By default the map
3152: is the top-level map of the course, filterFunc is a function that
3153: always returns 1, recursive is true, bailout is false, showall is
3154: false. The resources will be returned in a list containing the
3155: resource objects for the corresponding resources, with B<no structure
3156: information> in the list; regardless of branching, recursion, etc.,
3157: it will be a flat list.
3158:
3159: Thus, this is suitable for cases where you don't want the structure,
3160: just a list of all resources. It is also suitable for finding out how
3161: many resources match a given description; for this use, if all you
3162: want to know is if I<any> resources match the description, the bailout
3163: parameter will allow you to avoid potentially expensive enumeration of
3164: all matching resources.
3165:
3166: =item * B<hasResource>(map, filterFunc, recursive, showall):
3167:
3168: Convenience method for
3169:
3170: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
3171:
3172: which will tell whether the map has resources matching the description
3173: in the filter function.
3174:
3175: =item * B<usedVersion>(url):
3176:
3177: Retrieves version infomation for a url. Returns the version (a number, or
3178: the string "mostrecent") for resources which have version information in
3179: the big hash.
3180:
3181: =cut
3182:
3183:
3184: sub getResourceByUrl {
3185: my $self = shift;
3186: my $resUrl = shift;
3187: my $multiple = shift;
3188:
3189: if (ref($resUrl)) { return $resUrl; }
3190:
3191: $resUrl = &Apache::lonnet::clutter($resUrl);
3192: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
3193: if (!$resId) { return ''; }
3194: if ($multiple) {
3195: my @resources = ();
3196: my @resIds = split (/,/, $resId);
3197: foreach my $id (@resIds) {
3198: my $resourceId = $self->getById($id);
3199: if ($resourceId) {
3200: push(@resources,$resourceId);
3201: }
3202: }
3203: return @resources;
3204: } else {
3205: if ($resId =~ /,/) {
3206: $resId = (split (/,/, $resId))[0];
3207: }
3208: return $self->getById($resId);
3209: }
3210: }
3211:
3212: sub retrieveResources {
3213: my $self = shift;
3214: my $map = shift;
3215: my $filterFunc = shift;
3216: if (!defined ($filterFunc)) {
3217: $filterFunc = sub {return 1;};
3218: }
3219: my $recursive = shift;
3220: if (!defined($recursive)) { $recursive = 1; }
3221: my $bailout = shift;
3222: if (!defined($bailout)) { $bailout = 0; }
3223: my $showall = shift;
3224: my $noblockcheck = shift;
3225: # Create the necessary iterator.
3226: if (!ref($map)) { # assume it's a url of a map.
3227: $map = $self->getResourceByUrl($map);
3228: }
3229:
3230: # If nothing was passed, assume top-level map
3231: if (!$map) {
3232: $map = $self->getById('0.0');
3233: }
3234:
3235: # Check the map's validity.
3236: if (!$map->is_map()) {
3237: # Oh, to throw an exception.... how I'd love that!
3238: return ();
3239: }
3240:
3241: # Get an iterator.
3242: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
3243: undef, $recursive, $showall);
3244:
3245: my @resources = ();
3246:
3247: if (&$filterFunc($map)) {
3248: push(@resources, $map);
3249: }
3250:
3251: # Run down the iterator and collect the resources.
3252: my $curRes;
3253:
3254: while ($curRes = $it->next(undef,$noblockcheck)) {
3255: if (ref($curRes)) {
3256: if (!&$filterFunc($curRes)) {
3257: next;
3258: }
3259:
3260: push(@resources, $curRes);
3261:
3262: if ($bailout) {
3263: return @resources;
3264: }
3265: }
3266:
3267: }
3268:
3269: return @resources;
3270: }
3271:
3272: sub hasResource {
3273: my $self = shift;
3274: my $map = shift;
3275: my $filterFunc = shift;
3276: my $recursive = shift;
3277: my $showall = shift;
3278:
3279: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
3280: }
3281:
3282: sub usedVersion {
3283: my $self = shift;
3284: my $linkurl = shift;
3285: return $self->navhash("version_$linkurl");
3286: }
3287:
3288: 1;
3289:
3290: package Apache::lonnavmaps::iterator;
3291: use Scalar::Util qw(weaken);
3292: use Apache::lonnet;
3293:
3294: =pod
3295:
3296: =back
3297:
3298: =head1 Object: navmap Iterator
3299:
3300: An I<iterator> encapsulates the logic required to traverse a data
3301: structure. navmap uses an iterator to traverse the course map
3302: according to the criteria you wish to use.
3303:
3304: To obtain an iterator, call the B<getIterator>() function of a
3305: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
3306: directly.) This will return a reference to the iterator:
3307:
3308: C<my $resourceIterator = $navmap-E<gt>getIterator();>
3309:
3310: To get the next thing from the iterator, call B<next>:
3311:
3312: C<my $nextThing = $resourceIterator-E<gt>next()>
3313:
3314: getIterator behaves as follows:
3315:
3316: =over 4
3317:
3318: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
3319:
3320: All parameters are optional. firstResource is a resource reference
3321: corresponding to where the iterator should start. It defaults to
3322: navmap->firstResource() for the corresponding nav map. finishResource
3323: corresponds to where you want the iterator to end, defaulting to
3324: navmap->finishResource(). filterHash is a hash used as a set
3325: containing strings representing the resource IDs, defaulting to
3326: empty. Condition is a 1 or 0 that sets what to do with the filter
3327: hash: If a 0, then only resources that exist IN the filterHash will be
3328: recursed on. If it is a 1, only resources NOT in the filterHash will
3329: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
3330: false (default), the iterator will only return the first level of map
3331: that is not just a single, 'redirecting' map. If true, the iterator
3332: will return all information, starting with the top-level map,
3333: regardless of content. returnTopMap, if true (default false), will
3334: cause the iterator to return the top-level map object (resource 0.0)
3335: before anything else.
3336:
3337: Thus, by default, only top-level resources will be shown. Change the
3338: condition to a 1 without changing the hash, and all resources will be
3339: shown. Changing the condition to 1 and including some values in the
3340: hash will allow you to selectively suppress parts of the navmap, while
3341: leaving it on 0 and adding things to the hash will allow you to
3342: selectively add parts of the nav map. See the handler code for
3343: examples.
3344:
3345: The iterator will return either a reference to a resource object, or a
3346: token representing something in the map, such as the beginning of a
3347: new branch. The possible tokens are:
3348:
3349: =over 4
3350:
3351: =item * B<END_ITERATOR>:
3352:
3353: The iterator has returned all that it's going to. Further calls to the
3354: iterator will just produce more of these. This is a "false" value, and
3355: is the only false value the iterator which will be returned, so it can
3356: be used as a loop sentinel.
3357:
3358: =item * B<BEGIN_MAP>:
3359:
3360: A new map is being recursed into. This is returned I<after> the map
3361: resource itself is returned.
3362:
3363: =item * B<END_MAP>:
3364:
3365: The map is now done.
3366:
3367: =item * B<BEGIN_BRANCH>:
3368:
3369: A branch is now starting. The next resource returned will be the first
3370: in that branch.
3371:
3372: =item * B<END_BRANCH>:
3373:
3374: The branch is now done.
3375:
3376: =back
3377:
3378: The tokens are retreivable via methods on the iterator object, i.e.,
3379: $iterator->END_MAP.
3380:
3381: Maps can contain empty resources. The iterator will automatically skip
3382: over such resources, but will still treat the structure
3383: correctly. Thus, a complicated map with several branches, but
3384: consisting entirely of empty resources except for one beginning or
3385: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
3386: but only one resource will be returned.
3387:
3388: =back
3389:
3390: =head2 Normal Usage
3391:
3392: Normal usage of the iterator object is to do the following:
3393:
3394: my $it = $navmap->getIterator([your params here]);
3395: my $curRes;
3396: while ($curRes = $it->next()) {
3397: [your logic here]
3398: }
3399:
3400: Note that inside of the loop, it's frequently useful to check if
3401: "$curRes" is a reference or not with the reference function; only
3402: resource objects will be references, and any non-references will
3403: be the tokens described above.
3404:
3405: The next() routine can take two (optional) arguments:
3406: closeAllPages - if true will not recurse down a .page
3407: noblockcheck - passed to browsePriv() for passing as sixth arg to
3408: call to lonnet::allowed. This needs to be set if retrieveResources
3409: was already called from another routine called within lonnet::allowed,
3410: so as to prevent recursion.
3411:
3412: Also note there is some old code floating around that tries to track
3413: the depth of the iterator to see when it's done; do not copy that
3414: code. It is difficult to get right and harder to understand than
3415: this. They should be migrated to this new style.
3416:
3417: =cut
3418:
3419: # Here are the tokens for the iterator:
3420:
3421: sub END_ITERATOR { return 0; }
3422: sub BEGIN_MAP { return 1; } # begining of a new map
3423: sub END_MAP { return 2; } # end of the map
3424: sub BEGIN_BRANCH { return 3; } # beginning of a branch
3425: sub END_BRANCH { return 4; } # end of a branch
3426: sub FORWARD { return 1; } # go forward
3427: sub BACKWARD { return 2; }
3428:
3429: sub min {
3430: (my $a, my $b) = @_;
3431: if ($a < $b) { return $a; } else { return $b; }
3432: }
3433:
3434: sub new {
3435: # magic invocation to create a class instance
3436: my $proto = shift;
3437: my $class = ref($proto) || $proto;
3438: my $self = {};
3439:
3440: weaken($self->{NAV_MAP} = shift);
3441: return undef unless ($self->{NAV_MAP});
3442:
3443: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3444: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3445:
3446: # Handle the parameters
3447: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3448: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3449:
3450: # If the given resources are just the ID of the resource, get the
3451: # objects
3452: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3453: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3454: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3455: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3456:
3457: $self->{FILTER} = shift;
3458:
3459: # A hash, used as a set, of resource already seen
3460: $self->{ALREADY_SEEN} = shift;
3461: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3462: $self->{CONDITION} = shift;
3463:
3464: # Do we want to automatically follow "redirection" maps?
3465: $self->{FORCE_TOP} = shift;
3466:
3467: # Do we want to return the top-level map object (resource 0.0)?
3468: $self->{RETURN_0} = shift;
3469: # have we done that yet?
3470: $self->{HAVE_RETURNED_0} = 0;
3471:
3472: # Now, we need to pre-process the map, by walking forward and backward
3473: # over the parts of the map we're going to look at.
3474:
3475: # The processing steps are exactly the same, except for a few small
3476: # changes, so I bundle those up in the following list of two elements:
3477: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
3478: # first_resource).
3479: # This prevents writing nearly-identical code twice.
3480: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
3481: 'FIRST_RESOURCE'],
3482: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
3483: 'FINISH_RESOURCE'] );
3484:
3485: my $maxDepth = 0; # tracks max depth
3486:
3487: # If there is only one resource in this map, and it's a map, we
3488: # want to remember that, so the user can ask for the first map
3489: # that isn't just a redirector.
3490: my $resource; my $resourceCount = 0;
3491:
3492: # Documentation on this algorithm can be found in the CVS repository at
3493: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
3494: # in that file.
3495: # **1**
3496:
3497: foreach my $pass (@iterations) {
3498: my $direction = $pass->[0];
3499: my $valName = $pass->[1];
3500: my $nextResourceMethod = $pass->[2];
3501: my $firstResourceName = $pass->[3];
3502:
3503: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3504: $self->{FIRST_RESOURCE},
3505: $self->{FINISH_RESOURCE},
3506: {}, undef, 0, $direction);
3507:
3508: # prime the recursion
3509: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3510: $iterator->next();
3511: my $curRes = $iterator->next();
3512: my $depth = 1;
3513: while ($depth > 0) {
3514: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3515: if ($curRes == $iterator->END_MAP()) { $depth--; }
3516:
3517: if (ref($curRes)) {
3518: # If there's only one resource, this will save it
3519: # we have to filter empty resources from consideration here,
3520: # or even "empty", redirecting maps have two (start & finish)
3521: # or three (start, finish, plus redirector)
3522: if($direction == FORWARD && $curRes->src()) {
3523: $resource = $curRes; $resourceCount++;
3524: }
3525: my $resultingVal = $curRes->{DATA}->{$valName};
3526: my $nextResources = $curRes->$nextResourceMethod();
3527: my $nextCount = scalar(@{$nextResources});
3528:
3529: if ($nextCount == 1) { # **3**
3530: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3531: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3532: }
3533:
3534: if ($nextCount > 1) { # **4**
3535: foreach my $res (@{$nextResources}) {
3536: my $current = $res->{DATA}->{$valName} || 999999999;
3537: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3538: }
3539: }
3540: }
3541:
3542: # Assign the final val (**2**)
3543: if (ref($curRes) && $direction == BACKWARD()) {
3544: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3545: $curRes->{DATA}->{BOT_UP_VAL});
3546:
3547: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3548: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3549: }
3550:
3551: $curRes = $iterator->next();
3552: }
3553: }
3554:
3555: # Check: Was this only one resource, a map?
3556: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3557: my $firstResource = $resource->map_start();
3558: my $finishResource = $resource->map_finish();
3559: return Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3560: $finishResource, $self->{FILTER},
3561: $self->{ALREADY_SEEN},
3562: $self->{CONDITION},
3563: $self->{FORCE_TOP});
3564: }
3565:
3566: # Set up some bookkeeping information.
3567: $self->{CURRENT_DEPTH} = 0;
3568: $self->{MAX_DEPTH} = $maxDepth;
3569: $self->{STACK} = [];
3570: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3571: $self->{FINISHED} = 0; # When true, the iterator has finished
3572:
3573: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3574: push @{$self->{STACK}}, [];
3575: }
3576:
3577: # Prime the recursion w/ the first resource **5**
3578: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3579: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3580:
3581: bless ($self);
3582: return $self;
3583: }
3584:
3585: sub next {
3586: my $self = shift;
3587: my $closeAllPages=shift;
3588: my $noblockcheck = shift;
3589: if ($self->{FINISHED}) {
3590: return END_ITERATOR();
3591: }
3592:
3593: # If we want to return the top-level map object, and haven't yet,
3594: # do so.
3595: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3596: $self->{HAVE_RETURNED_0} = 1;
3597: my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
3598: return $self->{NAV_MAP}->getById('0.0');
3599: }
3600: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3601: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3602: return $self->BEGIN_MAP();
3603: }
3604:
3605: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3606: # grab the next from the recursive iterator
3607: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3608:
3609: # is it a begin or end map? If so, update the depth
3610: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3611: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3612:
3613: # Are we back at depth 0? If so, stop recursing
3614: if ($self->{RECURSIVE_DEPTH} == 0) {
3615: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3616: }
3617: return $next;
3618: }
3619:
3620: if (defined($self->{FORCE_NEXT})) {
3621: my $tmp = $self->{FORCE_NEXT};
3622: $self->{FORCE_NEXT} = undef;
3623: return $tmp;
3624: }
3625:
3626: # Have we not yet begun? If not, return BEGIN_MAP and
3627: # remember we've started.
3628: if ( !$self->{STARTED} ) {
3629: $self->{STARTED} = 1;
3630: return $self->BEGIN_MAP();
3631: }
3632:
3633: # Here's the guts of the iterator.
3634:
3635: # Find the next resource, if any.
3636: my $found = 0;
3637: my $i = $self->{MAX_DEPTH};
3638: my $newDepth;
3639: my $here;
3640: while ( $i >= 0 && !$found ) {
3641: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3642: $here = pop @{$self->{STACK}->[$i]}; # **7**
3643: $found = 1;
3644: $newDepth = $i;
3645: }
3646: $i--;
3647: }
3648:
3649: # If we still didn't find anything, we're done.
3650: if ( !$found ) {
3651: # We need to get back down to the correct branch depth
3652: if ( $self->{CURRENT_DEPTH} > 0 ) {
3653: $self->{CURRENT_DEPTH}--;
3654: return END_BRANCH();
3655: } else {
3656: $self->{FINISHED} = 1;
3657: return END_MAP();
3658: }
3659: }
3660:
3661: # If this is not a resource, it must be an END_BRANCH marker we want
3662: # to return directly.
3663: if (!ref($here)) { # **8**
3664: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3665: $self->{CURRENT_DEPTH}--;
3666: return $here;
3667: }
3668: }
3669:
3670: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3671: $self->{HERE} = $here;
3672:
3673: # Get to the right level
3674: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3675: push @{$self->{STACK}->[$newDepth]}, $here;
3676: $self->{CURRENT_DEPTH}--;
3677: return END_BRANCH();
3678: }
3679: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3680: push @{$self->{STACK}->[$newDepth]}, $here;
3681: $self->{CURRENT_DEPTH}++;
3682: return BEGIN_BRANCH();
3683: }
3684:
3685: # If we made it here, we have the next resource, and we're at the
3686: # right branch level. So let's examine the resource for where
3687: # we can get to from here.
3688:
3689: # So we need to look at all the resources we can get to from here,
3690: # categorize them if we haven't seen them, remember if we have a new
3691: my $nextUnfiltered = $here->getNext();
3692:
3693:
3694: my $maxDepthAdded = -1;
3695:
3696: for (@$nextUnfiltered) {
3697: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3698: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3699: push @{$self->{STACK}->[$depth]}, $_;
3700: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3701: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3702: }
3703: }
3704:
3705: # Is this the end of a branch? If so, all of the resources examined above
3706: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3707: # marker onto the stack so we don't forget.
3708: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3709: # BC branch and gets to C, it will see F as the only next resource, but it's
3710: # one level lower. Thus, this is the end of the branch, since there are no
3711: # more resources added to this level or above.
3712: # We don't do this if the examined resource is the finish resource,
3713: # because the condition given above is true, but the "END_MAP" will
3714: # take care of things and we should already be at depth 0.
3715: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3716: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3717: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3718: }
3719:
3720: # That ends the main iterator logic. Now, do we want to recurse
3721: # down this map (if this resource is a map)?
3722: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3723: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3724: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3725: my $firstResource = $self->{HERE}->map_start();
3726: my $finishResource = $self->{HERE}->map_finish();
3727: $self->{RECURSIVE_ITERATOR} =
3728: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3729: $finishResource, $self->{FILTER},
3730: $self->{ALREADY_SEEN},
3731: $self->{CONDITION},
3732: $self->{FORCE_TOP});
3733: }
3734:
3735: # If this is a blank resource, don't actually return it.
3736: # Should you ever find you need it, make sure to add an option to the code
3737: # that you can use; other things depend on this behavior.
3738: my $browsePriv = $self->{HERE}->browsePriv($noblockcheck);
3739: if (!$self->{HERE}->src() ||
3740: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3741: return $self->next($closeAllPages);
3742: }
3743:
3744: return $self->{HERE};
3745:
3746: }
3747:
3748: =pod
3749:
3750: The other method available on the iterator is B<getStack>, which
3751: returns an array populated with the current 'stack' of maps, as
3752: references to the resource objects. Example: This is useful when
3753: making the navigation map, as we need to check whether we are under a
3754: page map to see if we need to link directly to the resource, or to the
3755: page. The first elements in the array will correspond to the top of
3756: the stack (most inclusive map).
3757:
3758: =cut
3759:
3760: sub getStack {
3761: my $self=shift;
3762:
3763: my @stack;
3764:
3765: $self->populateStack(\@stack);
3766:
3767: return \@stack;
3768: }
3769:
3770: # Private method: Calls the iterators recursively to populate the stack.
3771: sub populateStack {
3772: my $self=shift;
3773: my $stack = shift;
3774:
3775: push @$stack, $self->{HERE} if ($self->{HERE});
3776:
3777: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3778: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3779: }
3780: }
3781:
3782: 1;
3783:
3784: package Apache::lonnavmaps::DFSiterator;
3785: use Scalar::Util qw(weaken);
3786: use Apache::lonnet;
3787:
3788: # Not documented in the perldoc: This is a simple iterator that just walks
3789: # through the nav map and presents the resources in a depth-first search
3790: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3791: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3792: # useful for pre-processing of some kind, and is in fact used by the main
3793: # iterator that way, but that's about it.
3794: # One could imagine merging this into the init routine of the main iterator,
3795: # but this might as well be left separate, since it is possible some other
3796: # use might be found for it. - Jeremy
3797:
3798: # Unlike the main iterator, this DOES return all resources, even blank ones.
3799: # The main iterator needs them to correctly preprocess the map.
3800:
3801: sub BEGIN_MAP { return 1; } # begining of a new map
3802: sub END_MAP { return 2; } # end of the map
3803: sub FORWARD { return 1; } # go forward
3804: sub BACKWARD { return 2; }
3805:
3806: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3807: # filter hash ref (or undef), already seen hash or undef, condition
3808: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3809: sub new {
3810: # magic invocation to create a class instance
3811: my $proto = shift;
3812: my $class = ref($proto) || $proto;
3813: my $self = {};
3814:
3815: weaken($self->{NAV_MAP} = shift);
3816: return undef unless ($self->{NAV_MAP});
3817:
3818: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3819: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3820:
3821: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3822: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3823:
3824: # If the given resources are just the ID of the resource, get the
3825: # objects
3826: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3827: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3828: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3829: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3830:
3831: $self->{FILTER} = shift;
3832:
3833: # A hash, used as a set, of resource already seen
3834: $self->{ALREADY_SEEN} = shift;
3835: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3836: $self->{CONDITION} = shift;
3837: $self->{DIRECTION} = shift || FORWARD();
3838:
3839: # Flag: Have we started yet?
3840: $self->{STARTED} = 0;
3841:
3842: # Should we continue calling the recursive iterator, if any?
3843: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3844: # The recursive iterator, if any
3845: $self->{RECURSIVE_ITERATOR} = undef;
3846: # Are we recursing on a map, or a branch?
3847: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3848: # And the count of how deep it is, so that this iterator can keep track of
3849: # when to pick back up again.
3850: $self->{RECURSIVE_DEPTH} = 0;
3851:
3852: # For keeping track of our branches, we maintain our own stack
3853: $self->{STACK} = [];
3854:
3855: # Start with the first resource
3856: if ($self->{DIRECTION} == FORWARD) {
3857: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3858: } else {
3859: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3860: }
3861:
3862: bless($self);
3863: return $self;
3864: }
3865:
3866: sub next {
3867: my $self = shift;
3868:
3869: # Are we using a recursive iterator? If so, pull from that and
3870: # watch the depth; we want to resume our level at the correct time.
3871: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3872: # grab the next from the recursive iterator
3873: my $next = $self->{RECURSIVE_ITERATOR}->next();
3874:
3875: # is it a begin or end map? Update depth if so
3876: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3877: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3878:
3879: # Are we back at depth 0? If so, stop recursing.
3880: if ($self->{RECURSIVE_DEPTH} == 0) {
3881: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3882: }
3883:
3884: return $next;
3885: }
3886:
3887: # Is there a current resource to grab? If not, then return
3888: # END_MAP, which will end the iterator.
3889: if (scalar(@{$self->{STACK}}) == 0) {
3890: return $self->END_MAP();
3891: }
3892:
3893: # Have we not yet begun? If not, return BEGIN_MAP and
3894: # remember that we've started.
3895: if ( !$self->{STARTED} ) {
3896: $self->{STARTED} = 1;
3897: return $self->BEGIN_MAP;
3898: }
3899:
3900: # Get the next resource in the branch
3901: $self->{HERE} = pop @{$self->{STACK}};
3902:
3903: # remember that we've seen this, so we don't return it again later
3904: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3905:
3906: # Get the next possible resources
3907: my $nextUnfiltered;
3908: if ($self->{DIRECTION} == FORWARD()) {
3909: $nextUnfiltered = $self->{HERE}->getNext();
3910: } else {
3911: $nextUnfiltered = $self->{HERE}->getPrevious();
3912: }
3913: my $next = [];
3914:
3915: # filter the next possibilities to remove things we've
3916: # already seen.
3917: foreach my $item (@$nextUnfiltered) {
3918: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3919: push @$next, $item;
3920: }
3921: }
3922:
3923: while (@$next) {
3924: # copy the next possibilities over to the stack
3925: push @{$self->{STACK}}, shift @$next;
3926: }
3927:
3928: # If this is a map and we want to recurse down it... (not filtered out)
3929: if ($self->{HERE}->is_map() &&
3930: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3931: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3932: my $firstResource = $self->{HERE}->map_start();
3933: my $finishResource = $self->{HERE}->map_finish();
3934:
3935: $self->{RECURSIVE_ITERATOR} =
3936: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3937: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3938: $self->{CONDITION}, $self->{DIRECTION});
3939: }
3940:
3941: return $self->{HERE};
3942: }
3943:
3944: # Identical to the full iterator methods of the same name. Hate to copy/paste
3945: # but I also hate to "inherit" either iterator from the other.
3946:
3947: sub getStack {
3948: my $self=shift;
3949:
3950: my @stack;
3951:
3952: $self->populateStack(\@stack);
3953:
3954: return \@stack;
3955: }
3956:
3957: # Private method: Calls the iterators recursively to populate the stack.
3958: sub populateStack {
3959: my $self=shift;
3960: my $stack = shift;
3961:
3962: push @$stack, $self->{HERE} if ($self->{HERE});
3963:
3964: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3965: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3966: }
3967: }
3968:
3969: 1;
3970:
3971: package Apache::lonnavmaps::resource;
3972: use Scalar::Util qw(weaken);
3973: use Apache::lonnet;
3974:
3975: =pod
3976:
3977: =head1 Object: resource
3978:
3979: X<resource, navmap object>
3980: A resource object encapsulates a resource in a resource map, allowing
3981: easy manipulation of the resource, querying the properties of the
3982: resource (including user properties), and represents a reference that
3983: can be used as the canonical representation of the resource by
3984: lonnavmap clients like renderers.
3985:
3986: A resource only makes sense in the context of a navmap, as some of the
3987: data is stored in the navmap object.
3988:
3989: You will probably never need to instantiate this object directly. Use
3990: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3991: starting resource.
3992:
3993: Resource objects respect the parameter_hiddenparts, which suppresses
3994: various parts according to the wishes of the map author. As of this
3995: writing, there is no way to override this parameter, and suppressed
3996: parts will never be returned, nor will their response types or ids be
3997: stored.
3998:
3999: =head2 Overview
4000:
4001: A B<Resource> is the most granular type of object in LON-CAPA that can
4002: be included in a course. It can either be a particular resource, like
4003: an HTML page, external resource, problem, etc., or it can be a
4004: container sequence, such as a "page" or a "map".
4005:
4006: To see a sequence from the user's point of view, please see the
4007: B<Creating a Course: Maps and Sequences> chapter of the Author's
4008: Manual.
4009:
4010: A Resource Object, once obtained from a navmap object via a B<getBy*>
4011: method of the navmap, or from an iterator, allows you to query
4012: information about that resource.
4013:
4014: Generally, you do not ever want to create a resource object yourself,
4015: so creation has been left undocumented. Always retrieve resources
4016: from navmap objects.
4017:
4018: =head3 Identifying Resources
4019:
4020: X<big hash>Every resource is identified by a Resource ID in the big hash that is
4021: unique to that resource for a given course. X<resource ID, in big hash>
4022: The Resource ID has the form #.#, where the first number is the same
4023: for every resource in a map, and the second is unique. For instance,
4024: for a course laid out like this:
4025:
4026: * Problem 1
4027: * Map
4028: * Resource 2
4029: * Resource 3
4030:
4031: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
4032: C<Resource 3> will share a first number. The second number may end up
4033: re-used between the two groups.
4034:
4035: The resource ID is only used in the big hash, but can be used in the
4036: context of a course to identify a resource easily. (For instance, the
4037: printing system uses it to record which resources from a sequence you
4038: wish to print.)
4039:
4040: X<symb> X<resource, symb>
4041: All resources also have B<symb>s, which uniquely identify a resource
4042: in a course. Many internal LON-CAPA functions expect a symb. A symb
4043: carries along with it the URL of the resource, and the map it appears
4044: in. Symbs are much larger than resource IDs.
4045:
4046: =cut
4047:
4048: sub new {
4049: # magic invocation to create a class instance
4050: my $proto = shift;
4051: my $class = ref($proto) || $proto;
4052: my $self = {};
4053:
4054: weaken($self->{NAV_MAP} = shift);
4055: $self->{ID} = shift;
4056:
4057: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
4058: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
4059:
4060: # Store this new resource in the parent nav map's cache.
4061: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
4062: $self->{RESOURCE_ERROR} = 0;
4063:
4064: $self->{DUEDATE_CACHE} = undef;
4065:
4066: # A hash that can be used by two-pass algorithms to store data
4067: # about this resource in. Not used by the resource object
4068: # directly.
4069: $self->{DATA} = {};
4070:
4071: bless($self);
4072:
4073: # This is a speed optimization, to avoid calling symb() too often.
4074: $self->{SYMB} = $self->symb();
4075:
4076: return $self;
4077: }
4078:
4079: # private function: simplify the NAV_HASH lookups we keep doing
4080: # pass the name, and to automatically append my ID, pass a true val on the
4081: # second param
4082: sub navHash {
4083: my $self = shift;
4084: my $param = shift;
4085: my $id = shift;
4086: my $arg = $param . ($id?$self->{ID}:"");
4087: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
4088: return $self->{NAV_MAP}->navhash($arg);
4089: }
4090: return;
4091: }
4092:
4093: =pod
4094:
4095: =head2 Methods
4096:
4097: Once you have a resource object, here's what you can do with it:
4098:
4099: =head3 Attribute Retrieval
4100:
4101: Every resource has certain attributes that can be retrieved and used:
4102:
4103: =over 4
4104:
4105: =item * B<ID>: Every resource has an ID that is unique for that
4106: resource in the course it is in. The ID is actually in the hash
4107: representing the resource, so for a resource object $res, obtain
4108: it via C<$res->{ID}).
4109:
4110: =item * B<compTitle>:
4111:
4112: Returns a "composite title", that is equal to $res->title() if the
4113: resource has a title, and is otherwise the last part of the URL (e.g.,
4114: "problem.problem").
4115:
4116: =item * B<ext>:
4117:
4118: Returns true if the resource is external.
4119:
4120: =item * B<kind>:
4121:
4122: Returns the kind of the resource from the compiled nav map.
4123:
4124: =item * B<randomout>:
4125:
4126: Returns true if this resource was chosen to NOT be shown to the user
4127: by the random map selection feature. In other words, this is usually
4128: false.
4129:
4130: =item * B<randompick>:
4131:
4132: Returns the number of randomly picked items for a map if the randompick
4133: feature is being used on the map.
4134:
4135: =item * B<randomorder>:
4136:
4137: Returns true for a map if the randomorder feature is being used on the
4138: map.
4139:
4140: =item * B<src>:
4141:
4142: Returns the source for the resource.
4143:
4144: =item * B<symb>:
4145:
4146: Returns the symb for the resource.
4147:
4148: =item * B<title>:
4149:
4150: Returns the title of the resource.
4151:
4152: =back
4153:
4154: =cut
4155:
4156: # These info functions can be used directly, as they don't return
4157: # resource information.
4158: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
4159: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
4160: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
4161: sub from { my $self=shift; return $self->navHash("from_", 1); }
4162: # considered private and undocumented
4163: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
4164: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
4165: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
4166: sub randompick {
4167: my $self = shift;
4168: my $randompick = $self->parmval('randompick');
4169: return $randompick;
4170: }
4171: sub randomorder {
4172: my $self = shift;
4173: my $randomorder = $self->parmval('randomorder');
4174: return ($randomorder =~ /^yes$/i);
4175: }
4176: sub link {
4177: my $self=shift;
4178: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
4179: return $self->src;
4180: }
4181: sub src {
4182: my $self=shift;
4183: return $self->navHash("src_", 1);
4184: }
4185: sub shown_symb {
4186: my $self=shift;
4187: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->{SYMB});}
4188: return $self->{SYMB};
4189: }
4190: sub id {
4191: my $self=shift;
4192: return $self->{ID};
4193: }
4194: sub enclosing_map_src {
4195: my $self=shift;
4196: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
4197: return $self->navHash('map_id_'.$first);
4198: }
4199: sub symb {
4200: my $self=shift;
4201: if (defined($self->{SYMB})) { return $self->{SYMB}; }
4202: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
4203: my $symbSrc = &Apache::lonnet::declutter($self->src());
4204: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
4205: . '___' . $second . '___' . $symbSrc;
4206: return &Apache::lonnet::symbclean($symb);
4207: }
4208: sub wrap_symb {
4209: my $self = shift;
4210: return $self->{NAV_MAP}->wrap_symb($self->{SYMB});
4211: }
4212: sub title {
4213: my $self=shift;
4214: if ($self->{ID} eq '0.0') {
4215: # If this is the top-level map, return the title of the course
4216: # since this map can not be titled otherwise.
4217: return $env{'course.'.$env{'request.course.id'}.'.description'};
4218: }
4219: return $self->navHash("title_", 1); }
4220: # considered private and undocumented
4221: sub to { my $self=shift; return $self->navHash("to_", 1); }
4222: sub condition {
4223: my $self=shift;
4224: my $undercond=$self->navHash("undercond_", 1);
4225: if (!defined($undercond)) { return 1; };
4226: my $condid=$self->navHash("condid_$undercond");
4227: if (!defined($condid)) { return 1; };
4228: my $condition=&Apache::lonnet::directcondval($condid);
4229: return $condition;
4230: }
4231: sub condval {
4232: my $self=shift;
4233: my ($pathname,$filename) =
4234: &Apache::lonnet::split_uri_for_cond($self->src());
4235:
4236: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
4237: /\&\Q$filename\E\:([\d\|]+)\&/);
4238: if ($match) {
4239: return &Apache::lonnet::condval($1);
4240: }
4241: return 0;
4242: }
4243: sub compTitle {
4244: my $self = shift;
4245: my $title = $self->title();
4246: $title=~s/\&colon\;/\:/gs;
4247: if (!$title) {
4248: $title = $self->src();
4249: $title = substr($title, rindex($title, '/') + 1);
4250: }
4251: return $title;
4252: }
4253:
4254: =pod
4255:
4256: B<Predicate Testing the Resource>
4257:
4258: These methods are shortcuts to deciding if a given resource has a given property.
4259:
4260: =over 4
4261:
4262: =item * B<is_map>:
4263:
4264: Returns true if the resource is a map type.
4265:
4266: =item * B<is_problem>:
4267:
4268: Returns true if the resource is a problem type, false
4269: otherwise. (Looks at the extension on the src field; might need more
4270: to work correctly.)
4271:
4272: =item * B<is_page>:
4273:
4274: Returns true if the resource is a page.
4275:
4276: =item * B<is_sequence>:
4277:
4278: Returns true if the resource is a sequence.
4279:
4280: =back
4281:
4282: =cut
4283:
4284: sub hasResource {
4285: my $self = shift;
4286: return $self->{NAV_MAP}->hasResource(@_);
4287: }
4288:
4289: sub retrieveResources {
4290: my $self = shift;
4291: return $self->{NAV_MAP}->retrieveResources(@_);
4292: }
4293:
4294: sub is_exam {
4295: my ($self,$part) = @_;
4296: my $type = $self->parmval('type',$part);
4297: if ($type eq 'exam') {
4298: return 1;
4299: }
4300: if ($self->src() =~ /\.(exam)$/) {
4301: return 1;
4302: }
4303: return 0;
4304: }
4305: sub is_html {
4306: my $self=shift;
4307: my $src = $self->src();
4308: return ($src =~ /html$/);
4309: }
4310: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
4311: sub is_page {
4312: my $self=shift;
4313: my $src = $self->src();
4314: return $self->navHash("is_map_", 1) &&
4315: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
4316: }
4317: sub is_practice {
4318: my $self=shift;
4319: my ($part) = @_;
4320: my $type = $self->parmval('type',$part);
4321: if ($type eq 'practice') {
4322: return 1;
4323: }
4324: return 0;
4325: }
4326: sub is_problem {
4327: my $self=shift;
4328: my $src = $self->src();
4329: if ($src =~ /$LONCAPA::assess_re/) {
4330: return !($self->is_practice());
4331: }
4332: return 0;
4333: }
4334: #
4335: # The has below is the set of status that are considered 'incomplete'
4336: #
4337: my %incomplete_hash =
4338: (
4339: TRIES_LEFT() => 1,
4340: OPEN() => 1,
4341: ATTEMPTED() => 1
4342:
4343: );
4344: #
4345: # Return tru if a problem is incomplete... for now incomplete means that
4346: # any part of the problem is incomplete.
4347: # Note that if the resources is not a problem, 0 is returned.
4348: #
4349: sub is_incomplete {
4350: my $self = shift;
4351: if ($self->is_problem()) {
4352: foreach my $part (@{$self->parts()}) {
4353: if (exists($incomplete_hash{$self->status($part)})) {
4354: return 1;
4355: }
4356: }
4357: }
4358: return 0;
4359:
4360: }
4361: sub is_raw_problem {
4362: my $self=shift;
4363: my $src = $self->src();
4364: if ($src =~ /$LONCAPA::assess_re/) {
4365: return 1;
4366: }
4367: return 0;
4368: }
4369:
4370: sub contains_problem {
4371: my $self=shift;
4372: if ($self->is_page()) {
4373: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
4374: return $hasProblem;
4375: }
4376: return 0;
4377: }
4378: sub map_contains_problem {
4379: my $self=shift;
4380: if ($self->is_map()) {
4381: my $has_problem=
4382: $self->hasResource($self,sub { $_[0]->is_problem() },1);
4383: return $has_problem;
4384: }
4385: return 0;
4386: }
4387: sub is_sequence {
4388: my $self=shift;
4389: return $self->navHash("is_map_", 1) &&
4390: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
4391: }
4392: sub is_survey {
4393: my $self = shift();
4394: my $part = shift();
4395: my $type = $self->parmval('type',$part);
4396: if (($type eq 'survey') || ($type eq 'surveycred')) {
4397: return 1;
4398: }
4399: if ($self->src() =~ /\.(survey)$/) {
4400: return 1;
4401: }
4402: return 0;
4403: }
4404: sub is_anonsurvey {
4405: my $self = shift();
4406: my $part = shift();
4407: my $type = $self->parmval('type',$part);
4408: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
4409: return 1;
4410: }
4411: return 0;
4412: }
4413: sub is_task {
4414: my $self=shift;
4415: my $src = $self->src();
4416: return ($src =~ /\.(task)$/)
4417: }
4418:
4419: sub is_empty_sequence {
4420: my $self=shift;
4421: my $src = $self->src();
4422: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
4423: }
4424:
4425: # Private method: Shells out to the parmval in the nav map, handler parts.
4426: sub parmval {
4427: my $self = shift;
4428: my $what = shift;
4429: my $part = shift;
4430: if (!defined($part)) {
4431: $part = '0';
4432: }
4433: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->{SYMB});
4434: }
4435:
4436: =pod
4437:
4438: B<Map Methods>
4439:
4440: These methods are useful for getting information about the map
4441: properties of the resource, if the resource is a map (B<is_map>).
4442:
4443: =over 4
4444:
4445: =item * B<map_finish>:
4446:
4447: Returns a reference to a resource object corresponding to the finish
4448: resource of the map.
4449:
4450: =item * B<map_pc>:
4451:
4452: Returns the pc value of the map, which is the first number that
4453: appears in the resource ID of the resources in the map, and is the
4454: number that appears around the middle of the symbs of the resources in
4455: that map.
4456:
4457: =item * B<map_start>:
4458:
4459: Returns a reference to a resource object corresponding to the start
4460: resource of the map.
4461:
4462: =item * B<map_type>:
4463:
4464: Returns a string with the type of the map in it.
4465:
4466: =item * B<map_hierarchy>:
4467:
4468: Returns a string with a comma-separated ordered list of map_pc IDs
4469: for the hierarchy of maps containing a map, with the top level
4470: map first, then descending to deeper levels, with the enclosing map last.
4471:
4472: =item * B<map_breadcrumbs>:
4473:
4474: Same as map_hierarchy, except maps containing only a single itemm if
4475: it's a map, or containing no items are omitted, unless it's the top
4476: level map (map_pc = 1), which is always included.
4477:
4478: =back
4479:
4480: =cut
4481:
4482: sub map_finish {
4483: my $self = shift;
4484: my $src = $self->src();
4485: $src = &Apache::lonnet::clutter($src);
4486: my $res = $self->navHash("map_finish_$src", 0);
4487: $res = $self->{NAV_MAP}->getById($res);
4488: return $res;
4489: }
4490: sub map_pc {
4491: my $self = shift;
4492: my $src = $self->src();
4493: return $self->navHash("map_pc_$src", 0);
4494: }
4495: sub map_start {
4496: my $self = shift;
4497: my $src = $self->src();
4498: $src = &Apache::lonnet::clutter($src);
4499: my $res = $self->navHash("map_start_$src", 0);
4500: $res = $self->{NAV_MAP}->getById($res);
4501: return $res;
4502: }
4503: sub map_type {
4504: my $self = shift;
4505: my $pc = $self->map_pc();
4506: return $self->navHash("map_type_$pc", 0);
4507: }
4508: sub map_hierarchy {
4509: my $self = shift;
4510: my $pc = $self->map_pc();
4511: return $self->navHash("map_hierarchy_$pc", 0);
4512: }
4513: sub map_breadcrumbs {
4514: my $self = shift;
4515: my $pc = $self->map_pc();
4516: return $self->navHash("map_breadcrumbs_$pc", 0);
4517: }
4518:
4519: #####
4520: # Property queries
4521: #####
4522:
4523: # These functions will be responsible for returning the CORRECT
4524: # VALUE for the parameter, no matter what. So while they may look
4525: # like direct calls to parmval, they can be more than that.
4526: # So, for instance, the duedate function should use the "duedatetype"
4527: # information, rather than the resource object user.
4528:
4529: =pod
4530:
4531: =head2 Resource Parameters
4532:
4533: In order to use the resource parameters correctly, the nav map must
4534: have been instantiated with genCourseAndUserOptions set to true, so
4535: the courseopt and useropt is read correctly. Then, you can call these
4536: functions to get the relevant parameters for the resource. Each
4537: function defaults to part "0", but can be directed to another part by
4538: passing the part as the parameter.
4539:
4540: These methods are responsible for getting the parameter correct, not
4541: merely reflecting the contents of the GDBM hashes. As we move towards
4542: dates relative to other dates, these methods should be updated to
4543: reflect that. (Then, anybody using these methods will not have to update
4544: their code.)
4545:
4546: =over 4
4547:
4548:
4549: =item * B<printable>
4550:
4551: returns true if the current date is such that the
4552: specified resource part is printable.
4553:
4554:
4555: =item * B<resprintable>
4556:
4557: Returns true if all parts in the resource are printable making the
4558: entire resource printable.
4559:
4560: =item * B<acc>
4561:
4562: Get the Client IP/Name Access Control information.
4563:
4564: =item * B<answerdate>:
4565:
4566: Get the answer-reveal date for the problem.
4567:
4568: =item * B<awarded>:
4569:
4570: Gets the awarded value for the problem part. Requires genUserData set to
4571: true when the navmap object was created.
4572:
4573: =item * B<duedate>:
4574:
4575: Get the due date for the problem.
4576:
4577: =item * B<tries>:
4578:
4579: Get the number of tries the student has used on the problem.
4580:
4581: =item * B<maxtries>:
4582:
4583: Get the number of max tries allowed.
4584:
4585: =item * B<opendate>:
4586:
4587: Get the open date for the problem.
4588:
4589: =item * B<sig>:
4590:
4591: Get the significant figures setting.
4592:
4593: =item * B<tol>:
4594:
4595: Get the tolerance for the problem.
4596:
4597: =item * B<tries>:
4598:
4599: Get the number of tries the user has already used on the problem.
4600:
4601: =item * B<type>:
4602:
4603: Get the question type for the problem.
4604:
4605: =item * B<weight>:
4606:
4607: Get the weight for the problem.
4608:
4609: =back
4610:
4611: =cut
4612:
4613:
4614:
4615:
4616: sub printable {
4617:
4618: my ($self, $part) = @_;
4619:
4620: # The following cases apply:
4621: # - If a start date is not set, it is replaced by the open date.
4622: # - Ditto for start/open replaced by content open.
4623: # - If neither start nor printdates are set the part is printable.
4624: # - Start date set but no end date: Printable if now >= start date.
4625: # - End date set but no start date: Printable if now <= end date.
4626: # - both defined: printable if start <= now <= end
4627: #
4628:
4629: # Get the print open/close dates for the resource.
4630:
4631: my $start = $self->parmval("printstartdate", $part);
4632: my $end = $self->parmval("printenddate", $part);
4633:
4634: if (!$start) {
4635: $start = $self->parmval("opendate", $part);
4636: }
4637: if (!$start) {
4638: $start = $self->parmval("contentopen", $part);
4639: }
4640:
4641:
4642: my $now = time();
4643:
4644:
4645: my $startok = 1;
4646: my $endok = 1;
4647:
4648: if ((defined $start) && ($start ne '')) {
4649: $startok = $start <= $now;
4650: }
4651: if ((defined $end) && ($end != '')) {
4652: $endok = $end >= $now;
4653: }
4654: return $startok && $endok;
4655: }
4656:
4657: sub resprintable {
4658: my $self = shift;
4659:
4660: # get parts...or realize there are no parts.
4661:
4662: my $partsref = $self->parts();
4663: my @parts = @$partsref;
4664:
4665: if (!@parts) {
4666: return $self->printable(0);
4667: } else {
4668: foreach my $part (@parts) {
4669: if (!$self->printable($part)) {
4670: return 0;
4671: }
4672: }
4673: return 1;
4674: }
4675: }
4676:
4677: sub acc {
4678: (my $self, my $part) = @_;
4679: my $acc = $self->parmval("acc", $part);
4680: return $acc;
4681: }
4682: sub answerdate {
4683: (my $self, my $part) = @_;
4684: # Handle intervals
4685: my $answerdatetype = $self->parmval("answerdate.type", $part);
4686: my $answerdate = $self->parmval("answerdate", $part);
4687: my $duedate = $self->parmval("duedate", $part);
4688: if ($answerdatetype eq 'date_interval') {
4689: $answerdate = $duedate + $answerdate;
4690: }
4691: return $answerdate;
4692: }
4693: sub awarded {
4694: my $self = shift; my $part = shift;
4695: $self->{NAV_MAP}->get_user_data();
4696: if (!defined($part)) { $part = '0'; }
4697: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.awarded'};
4698: }
4699: sub taskversion {
4700: my $self = shift; my $part = shift;
4701: $self->{NAV_MAP}->get_user_data();
4702: if (!defined($part)) { $part = '0'; }
4703: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.version'};
4704: }
4705: sub taskstatus {
4706: my $self = shift; my $part = shift;
4707: $self->{NAV_MAP}->get_user_data();
4708: if (!defined($part)) { $part = '0'; }
4709: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
4710: }
4711: sub solved {
4712: my $self = shift; my $part = shift;
4713: $self->{NAV_MAP}->get_user_data();
4714: if (!defined($part)) { $part = '0'; }
4715: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.solved'};
4716: }
4717: sub checkedin {
4718: my $self = shift; my $part = shift;
4719: $self->{NAV_MAP}->get_user_data();
4720: if (!defined($part)) { $part = '0'; }
4721: if ($self->is_task()) {
4722: my $version = $self->taskversion($part);
4723: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4724: } else {
4725: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin.slot'});
4726: }
4727: }
4728: # this should work exactly like the copy in lonhomework.pm
4729: # Why is there a copy in lonhomework? Why not centralized?
4730: #
4731: # TODO: Centralize duedate.
4732: #
4733:
4734: sub duedate {
4735: (my $self, my $part) = @_;
4736: if (defined ($self->{DUEDATE_CACHE}->{$part})) {
4737: return $self->{DUEDATE_CACHE}->{$part};
4738: }
4739: my $date;
4740: my @interval=$self->parmval("interval", $part);
4741: my $due_date=$self->parmval("duedate", $part);
4742: if ($interval[0] =~ /^(\d+)/) {
4743: my $timelimit = $1;
4744: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4745: $self->{SYMB});
4746: if (defined($first_access)) {
4747: my $interval = $first_access+$timelimit;
4748: $date = (!$due_date || $interval < $due_date) ? $interval
4749: : $due_date;
4750: } else {
4751: $date = $due_date;
4752: }
4753: } else {
4754: $date = $due_date;
4755: }
4756: $self->{DUEDATE_CACHE}->{$part} = $date;
4757: return $date;
4758: }
4759: sub handgrade {
4760: (my $self, my $part) = @_;
4761: my @response_ids = $self->responseIds($part);
4762: if (@response_ids) {
4763: foreach my $response_id (@response_ids) {
4764: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4765: if (lc($handgrade) eq 'yes') {
4766: return 'yes';
4767: }
4768: }
4769: }
4770: my $handgrade = $self->parmval("handgrade", $part);
4771: return $handgrade;
4772: }
4773: sub maxtries {
4774: (my $self, my $part) = @_;
4775: my $maxtries = $self->parmval("maxtries", $part);
4776: return $maxtries;
4777: }
4778: sub opendate {
4779: (my $self, my $part) = @_;
4780: my $opendatetype = $self->parmval("opendate.type", $part);
4781: my $opendate = $self->parmval("opendate", $part);
4782: if ($opendatetype eq 'date_interval') {
4783: my $duedate = $self->duedate($part);
4784: $opendate = $duedate - $opendate;
4785: }
4786: return $opendate;
4787: }
4788: sub problemstatus {
4789: (my $self, my $part) = @_;
4790: my $problemstatus = $self->parmval("problemstatus", $part);
4791: return lc($problemstatus);
4792: }
4793: sub sig {
4794: (my $self, my $part) = @_;
4795: my $sig = $self->parmval("sig", $part);
4796: return $sig;
4797: }
4798: sub tol {
4799: (my $self, my $part) = @_;
4800: my $tol = $self->parmval("tol", $part);
4801: return $tol;
4802: }
4803: sub tries {
4804: my $self = shift;
4805: my $tries = $self->queryRestoreHash('tries', shift);
4806: if (!defined($tries)) { return '0';}
4807: return $tries;
4808: }
4809: sub type {
4810: (my $self, my $part) = @_;
4811: my $type = $self->parmval("type", $part);
4812: return $type;
4813: }
4814: sub weight {
4815: my $self = shift; my $part = shift;
4816: if (!defined($part)) { $part = '0'; }
4817: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4818: $self->{SYMB}, $self->{DOMAIN},
4819: $self->{USERNAME},
4820: $env{'request.course.sec'});
4821: return $weight;
4822: }
4823: sub part_display {
4824: my $self= shift(); my $partID = shift();
4825: if (! defined($partID)) { $partID = '0'; }
4826: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4827: $self->{SYMB});
4828: if (! defined($display) || $display eq '') {
4829: $display = $partID;
4830: }
4831: return $display;
4832: }
4833: sub slot_control {
4834: my $self=shift(); my $part = shift();
4835: if (!defined($part)) { $part = '0'; }
4836: my $useslots = $self->parmval("useslots", $part);
4837: my $availablestudent = $self->parmval("availablestudent", $part);
4838: my $available = $self->parmval("available", $part);
4839: return ($useslots,$availablestudent,$available);
4840: }
4841:
4842: # Multiple things need this
4843: sub getReturnHash {
4844: my $self = shift;
4845:
4846: if (!defined($self->{RETURN_HASH})) {
4847: my %tmpHash = &Apache::lonnet::restore($self->{SYMB},undef,$self->{DOMAIN},$self->{USERNAME});
4848: $self->{RETURN_HASH} = \%tmpHash;
4849: }
4850: }
4851:
4852: ######
4853: # Status queries
4854: ######
4855:
4856: # These methods query the status of problems.
4857:
4858: # If we need to count parts, this function determines the number of
4859: # parts from the metadata. When called, it returns a reference to a list
4860: # of strings corresponding to the parts. (Thus, using it in a scalar context
4861: # tells you how many parts you have in the problem:
4862: # $partcount = scalar($resource->countParts());
4863: # Don't use $self->{PARTS} directly because you don't know if it's been
4864: # computed yet.
4865:
4866: =pod
4867:
4868: =head2 Resource misc
4869:
4870: Misc. functions for the resource.
4871:
4872: =over 4
4873:
4874: =item * B<hasDiscussion>:
4875:
4876: Returns a false value if there has been discussion since the user last
4877: logged in, true if there has. Always returns false if the discussion
4878: data was not extracted when the nav map was constructed.
4879:
4880: =item * B<last_post_time>:
4881:
4882: Returns a false value if there hasn't been discussion otherwise returns
4883: unix timestamp of last time a discussion posting (or edit) was made.
4884:
4885: =item * B<discussion_info>:
4886:
4887: optional argument is a filter (currently can be 'unread');
4888: returns in scalar context the count of the number of discussion postings.
4889:
4890: returns in list context both the count of postings and a hash ref
4891: containing information about the postings (subject, id, timestamp) in a hash.
4892:
4893: 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.
4894:
4895: =item * B<getFeedback>:
4896:
4897: Gets the feedback for the resource and returns the raw feedback string
4898: for the resource, or the null string if there is no feedback or the
4899: email data was not extracted when the nav map was constructed. Usually
4900: used like this:
4901:
4902: for my $url (split(/\,/, $res->getFeedback())) {
4903: my $link = &escape($url);
4904: ...
4905:
4906: and use the link as appropriate.
4907:
4908: =cut
4909:
4910: sub hasDiscussion {
4911: my $self = shift;
4912: return $self->{NAV_MAP}->hasDiscussion($self->{SYMB});
4913: }
4914:
4915: sub last_post_time {
4916: my $self = shift;
4917: return $self->{NAV_MAP}->last_post_time($self->{SYMB});
4918: }
4919:
4920: sub discussion_info {
4921: my ($self,$filter) = @_;
4922: return $self->{NAV_MAP}->discussion_info($self->{SYMB},$filter);
4923: }
4924:
4925: sub getFeedback {
4926: my $self = shift;
4927: my $source = $self->src();
4928: my $symb = $self->{SYMB};
4929: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4930: return $self->{NAV_MAP}->getFeedback($symb,$source);
4931: }
4932:
4933: sub getErrors {
4934: my $self = shift;
4935: my $source = $self->src();
4936: my $symb = $self->{SYMB};
4937: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4938: return $self->{NAV_MAP}->getErrors($symb,$source);
4939: }
4940:
4941: =pod
4942:
4943: =item * B<parts>():
4944:
4945: Returns a list reference containing sorted strings corresponding to
4946: each part of the problem. Single part problems have only a part '0'.
4947: Multipart problems do not return their part '0', since they typically
4948: do not really matter.
4949:
4950: =item * B<countParts>():
4951:
4952: Returns the number of parts of the problem a student can answer. Thus,
4953: for single part problems, returns 1. For multipart, it returns the
4954: number of parts in the problem, not including psuedo-part 0.
4955:
4956: =item * B<countResponses>():
4957:
4958: Returns the total number of responses in the problem a student can answer.
4959:
4960: =item * B<responseTypes>():
4961:
4962: Returns a hash whose keys are the response types. The values are the number
4963: of times each response type is used. This is for the I<entire> problem, not
4964: just a single part.
4965:
4966: =item * B<multipart>():
4967:
4968: Returns true if the problem is multipart, false otherwise. Use this instead
4969: of countParts if all you want is multipart/not multipart.
4970:
4971: =item * B<responseType>($part):
4972:
4973: Returns the response type of the part, without the word "response" on the
4974: end. Example return values: 'string', 'essay', 'numeric', etc.
4975:
4976: =item * B<responseIds>($part):
4977:
4978: Retreives the response IDs for the given part as an array reference containing
4979: strings naming the response IDs. This may be empty.
4980:
4981: =back
4982:
4983: =cut
4984:
4985: sub parts {
4986: my $self = shift;
4987:
4988: if ($self->ext) { return []; }
4989:
4990: $self->extractParts();
4991: return $self->{PARTS};
4992: }
4993:
4994: sub countParts {
4995: my $self = shift;
4996:
4997: my $parts = $self->parts();
4998:
4999: # If I left this here, then it's not necessary.
5000: #my $delta = 0;
5001: #for my $part (@$parts) {
5002: # if ($part eq '0') { $delta--; }
5003: #}
5004:
5005: if ($self->{RESOURCE_ERROR}) {
5006: return 0;
5007: }
5008:
5009: return scalar(@{$parts}); # + $delta;
5010: }
5011:
5012: sub countResponses {
5013: my $self = shift;
5014: my $count;
5015: foreach my $part (@{$self->parts()}) {
5016: $count+= scalar($self->responseIds($part));
5017: }
5018: return $count;
5019: }
5020:
5021: sub responseTypes {
5022: my $self = shift;
5023: my %responses;
5024: foreach my $part (@{$self->parts()}) {
5025: foreach my $responsetype ($self->responseType($part)) {
5026: $responses{$responsetype}++ if (defined($responsetype));
5027: }
5028: }
5029: return %responses;
5030: }
5031:
5032: sub multipart {
5033: my $self = shift;
5034: return $self->countParts() > 1;
5035: }
5036:
5037: sub singlepart {
5038: my $self = shift;
5039: return $self->countParts() == 1;
5040: }
5041:
5042: sub responseType {
5043: my $self = shift;
5044: my $part = shift;
5045:
5046: $self->extractParts();
5047: if (defined($self->{RESPONSE_TYPES}->{$part})) {
5048: return @{$self->{RESPONSE_TYPES}->{$part}};
5049: } else {
5050: return undef;
5051: }
5052: }
5053:
5054: sub responseIds {
5055: my $self = shift;
5056: my $part = shift;
5057:
5058: $self->extractParts();
5059: if (defined($self->{RESPONSE_IDS}->{$part})) {
5060: return @{$self->{RESPONSE_IDS}->{$part}};
5061: } else {
5062: return undef;
5063: }
5064: }
5065:
5066: # Private function: Extracts the parts information, both part names and
5067: # part types, and saves it.
5068: sub extractParts {
5069: my $self = shift;
5070:
5071: return if (defined($self->{PARTS}));
5072: return if ($self->ext);
5073:
5074: $self->{PARTS} = [];
5075:
5076: my %parts;
5077:
5078: # Retrieve part count, if this is a problem
5079: if ($self->is_problem()) {
5080: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
5081: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
5082:
5083: if ($partorder) {
5084: my @parts;
5085: for my $part (split (/,/,$partorder)) {
5086: if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
5087: push @parts, $part;
5088: $parts{$part} = 1;
5089: }
5090: }
5091: $self->{PARTS} = \@parts;
5092: } else {
5093: if (!$metadata) {
5094: $self->{RESOURCE_ERROR} = 1;
5095: $self->{PARTS} = [];
5096: $self->{PART_TYPE} = {};
5097: return;
5098: }
5099: foreach my $entry (split(/\,/,$metadata)) {
5100: if ($entry =~ /^(?:part|Task)_(.*)$/) {
5101: my $part = $1;
5102: # This floods the logs if it blows up
5103: if (defined($parts{$part})) {
5104: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->{SYMB});
5105: }
5106:
5107: # check to see if part is turned off.
5108:
5109: if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
5110: $parts{$part} = 1;
5111: }
5112: }
5113: }
5114: my @sortedParts = sort(keys(%parts));
5115: $self->{PARTS} = \@sortedParts;
5116: }
5117:
5118:
5119: # These hashes probably do not need names that end with "Hash"....
5120: my %responseIdHash;
5121: my %responseTypeHash;
5122:
5123:
5124: # Init the responseIdHash
5125: foreach my $part (@{$self->{PARTS}}) {
5126: $responseIdHash{$part} = [];
5127: }
5128:
5129: # Now, the unfortunate thing about this is that parts, part name, and
5130: # response id are delimited by underscores, but both the part
5131: # name and response id can themselves have underscores in them.
5132: # So we have to use our knowlege of part names to figure out
5133: # where the part names begin and end, and even then, it is possible
5134: # to construct ambiguous situations.
5135: foreach my $data (split(/,/, $metadata)) {
5136: if ($data =~ /^([a-zA-Z]+)response_(.*)/
5137: || $data =~ /^(Task)_(.*)/) {
5138: my $responseType = $1;
5139: my $partStuff = $2;
5140: my $partIdSoFar = '';
5141: my @partChunks = split(/_/, $partStuff);
5142: my $i = 0;
5143: for ($i = 0; $i < scalar(@partChunks); $i++) {
5144: if ($partIdSoFar) { $partIdSoFar .= '_'; }
5145: $partIdSoFar .= $partChunks[$i];
5146: if ($parts{$partIdSoFar}) {
5147: my @otherChunks = @partChunks[$i+1..$#partChunks];
5148: my $responseId = join('_', @otherChunks);
5149: if ($self->is_task()) {
5150: push(@{$responseIdHash{$partIdSoFar}},
5151: $partIdSoFar);
5152: } else {
5153: push(@{$responseIdHash{$partIdSoFar}},
5154: $responseId);
5155: }
5156: push(@{$responseTypeHash{$partIdSoFar}},
5157: $responseType);
5158: }
5159: }
5160: }
5161: }
5162: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
5163: #
5164: # Reorder the arrays in the %responseIdHash and %responseTypeHash
5165: if ($resorder) {
5166: my @resorder=split(/,/,$resorder);
5167: foreach my $part (keys(%responseIdHash)) {
5168: my $i=0;
5169: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
5170: my @neworder;
5171: foreach my $possibleid (@resorder) {
5172: if (exists($resids{$possibleid})) {
5173: push(@neworder,$resids{$possibleid});
5174: }
5175: }
5176: my @ids;
5177: my @type;
5178: foreach my $element (@neworder) {
5179: push (@ids,$responseIdHash{$part}->[$element]);
5180: push (@type,$responseTypeHash{$part}->[$element]);
5181: }
5182: $responseIdHash{$part}=\@ids;
5183: $responseTypeHash{$part}=\@type;
5184: }
5185: }
5186: $self->{RESPONSE_IDS} = \%responseIdHash;
5187: $self->{RESPONSE_TYPES} = \%responseTypeHash;
5188: }
5189:
5190: return;
5191: }
5192:
5193: =pod
5194:
5195: =head2 Resource Status
5196:
5197: Problem resources have status information, reflecting their various
5198: dates and completion statuses.
5199:
5200: There are two aspects to the status: the date-related information and
5201: the completion information.
5202:
5203: Idiomatic usage of these two methods would probably look something
5204: like
5205:
5206: foreach my $part ($resource->parts()) {
5207: my $dateStatus = $resource->getDateStatus($part);
5208: my $completionStatus = $resource->getCompletionStatus($part);
5209:
5210: or
5211:
5212: my $status = $resource->status($part);
5213:
5214: ... use it here ...
5215: }
5216:
5217: Which you use depends on exactly what you are looking for. The
5218: status() function has been optimized for the nav maps display and may
5219: not precisely match what you need elsewhere.
5220:
5221: The symbolic constants shown below can be accessed through the
5222: resource object: C<$res->OPEN>.
5223:
5224: =over 4
5225:
5226: =item * B<getDateStatus>($part):
5227:
5228: ($part defaults to 0). A convenience function that returns a symbolic
5229: constant telling you about the date status of the part. The possible
5230: return values are:
5231:
5232: =back
5233:
5234: B<Date Codes>
5235:
5236: =over 4
5237:
5238: =item * B<OPEN_LATER>:
5239:
5240: The problem will be opened later.
5241:
5242: =item * B<OPEN>:
5243:
5244: Open and not yet due.
5245:
5246:
5247: =item * B<PAST_DUE_ANSWER_LATER>:
5248:
5249: The due date has passed, but the answer date has not yet arrived.
5250:
5251: =item * B<PAST_DUE_NO_ANSWER>:
5252:
5253: The due date has passed and there is no answer opening date set.
5254:
5255: =item * B<ANSWER_OPEN>:
5256:
5257: The answer date is here.
5258:
5259: =item * B<NETWORK_FAILURE>:
5260:
5261: The information is unknown due to network failure.
5262:
5263: =back
5264:
5265: =cut
5266:
5267: # Apparently the compiler optimizes these into constants automatically
5268: sub OPEN_LATER { return 0; }
5269: sub OPEN { return 1; }
5270: sub PAST_DUE_NO_ANSWER { return 2; }
5271: sub PAST_DUE_ANSWER_LATER { return 3; }
5272: sub ANSWER_OPEN { return 4; }
5273: sub NOTHING_SET { return 5; }
5274: sub NETWORK_FAILURE { return 100; }
5275:
5276: # getDateStatus gets the date status for a given problem part.
5277: # Because answer date, due date, and open date are fully independent
5278: # (i.e., it is perfectly possible to *only* have an answer date),
5279: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
5280: # (past, future, none given). This function handles this with a decision
5281: # tree. Read the comments to follow the decision tree.
5282:
5283: sub getDateStatus {
5284: my $self = shift;
5285: my $part = shift;
5286: $part = "0" if (!defined($part));
5287:
5288: # Always return network failure if there was one.
5289: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
5290:
5291: my $now = time();
5292:
5293: my $open = $self->opendate($part);
5294: my $due = $self->duedate($part);
5295: my $answer = $self->answerdate($part);
5296:
5297: if (!$open && !$due && !$answer) {
5298: # no data on the problem at all
5299: # should this be the same as "open later"? think multipart.
5300: return $self->NOTHING_SET;
5301: }
5302: if (!$open || $now < $open) {return $self->OPEN_LATER}
5303: if (!$due || $now < $due) {return $self->OPEN}
5304: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
5305: if ($answer) { return $self->ANSWER_OPEN; }
5306: return PAST_DUE_NO_ANSWER;
5307: }
5308:
5309: =pod
5310:
5311: B<>
5312:
5313: =over 4
5314:
5315: =item * B<getCompletionStatus>($part):
5316:
5317: ($part defaults to 0.) A convenience function that returns a symbolic
5318: constant telling you about the completion status of the part, with the
5319: following possible results:
5320:
5321: =back
5322:
5323: B<Completion Codes>
5324:
5325: =over 4
5326:
5327: =item * B<NOT_ATTEMPTED>:
5328:
5329: Has not been attempted at all.
5330:
5331: =item * B<INCORRECT>:
5332:
5333: Attempted, but wrong by student.
5334:
5335: =item * B<INCORRECT_BY_OVERRIDE>:
5336:
5337: Attempted, but wrong by instructor override.
5338:
5339: =item * B<CORRECT>:
5340:
5341: Correct or correct by instructor.
5342:
5343: =item * B<CORRECT_BY_OVERRIDE>:
5344:
5345: Correct by instructor override.
5346:
5347: =item * B<EXCUSED>:
5348:
5349: Excused. Not yet implemented.
5350:
5351: =item * B<NETWORK_FAILURE>:
5352:
5353: Information not available due to network failure.
5354:
5355: =item * B<ATTEMPTED>:
5356:
5357: Attempted, and not yet graded.
5358:
5359: =item * B<CREDIT_ATTEMPTED>:
5360:
5361: Attempted, and credit received for attempt (survey and anonymous survey only).
5362:
5363: =back
5364:
5365: =cut
5366:
5367: sub NOT_ATTEMPTED { return 10; }
5368: sub INCORRECT { return 11; }
5369: sub INCORRECT_BY_OVERRIDE { return 12; }
5370: sub CORRECT { return 13; }
5371: sub CORRECT_BY_OVERRIDE { return 14; }
5372: sub EXCUSED { return 15; }
5373: sub ATTEMPTED { return 16; }
5374: sub CREDIT_ATTEMPTED { return 17; }
5375:
5376: sub getCompletionStatus {
5377: my $self = shift;
5378: my $part = shift;
5379: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
5380:
5381: my $status = $self->queryRestoreHash('solved', $part);
5382:
5383: # Left as separate if statements in case we ever do more with this
5384: if ($status eq 'correct_by_student') {return $self->CORRECT;}
5385: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
5386: if ($status eq 'correct_by_override') {
5387: return $self->CORRECT_BY_OVERRIDE;
5388: }
5389: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
5390: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
5391: if ($status eq 'excused') {return $self->EXCUSED; }
5392: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
5393: if ($status eq 'credit_attempted') {
5394: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
5395: return $self->CREDIT_ATTEMPTED;
5396: } else {
5397: return $self->ATTEMPTED;
5398: }
5399: }
5400: return $self->NOT_ATTEMPTED;
5401: }
5402:
5403: sub queryRestoreHash {
5404: my $self = shift;
5405: my $hashentry = shift;
5406: my $part = shift;
5407: $part = "0" if (!defined($part) || $part eq '');
5408: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
5409:
5410: $self->getReturnHash();
5411:
5412: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
5413: }
5414:
5415: =pod
5416:
5417: B<Composite Status>
5418:
5419: Along with directly returning the date or completion status, the
5420: resource object includes a convenience function B<status>() that will
5421: combine the two status tidbits into one composite status that can
5422: represent the status of the resource as a whole. This method represents
5423: the concept of the thing we want to display to the user on the nav maps
5424: screen, which is a combination of completion and open status. The precise logic is
5425: documented in the comments of the status method. The following results
5426: may be returned, all available as methods on the resource object
5427: ($res->NETWORK_FAILURE): In addition to the return values that match
5428: the date or completion status, this function can return "ANSWER_SUBMITTED"
5429: if that problemstatus parameter value is set to No, suppressing the
5430: incorrect/correct feedback.
5431:
5432: =over 4
5433:
5434: =item * B<NETWORK_FAILURE>:
5435:
5436: The network has failed and the information is not available.
5437:
5438: =item * B<NOTHING_SET>:
5439:
5440: No dates have been set for this problem (part) at all. (Because only
5441: certain parts of a multi-part problem may be assigned, this can not be
5442: collapsed into "open later", as we do not know a given part will EVER
5443: be opened. For single part, this is the same as "OPEN_LATER".)
5444:
5445: =item * B<CORRECT>:
5446:
5447: For any reason at all, the part is considered correct.
5448:
5449: =item * B<EXCUSED>:
5450:
5451: For any reason at all, the problem is excused.
5452:
5453: =item * B<PAST_DUE_NO_ANSWER>:
5454:
5455: The problem is past due, not considered correct, and no answer date is
5456: set.
5457:
5458: =item * B<PAST_DUE_ANSWER_LATER>:
5459:
5460: The problem is past due, not considered correct, and an answer date in
5461: the future is set.
5462:
5463: =item * B<ANSWER_OPEN>:
5464:
5465: The problem is past due, not correct, and the answer is now available.
5466:
5467: =item * B<OPEN_LATER>:
5468:
5469: The problem is not yet open.
5470:
5471: =item * B<TRIES_LEFT>:
5472:
5473: The problem is open, has been tried, is not correct, but there are
5474: tries left.
5475:
5476: =item * B<INCORRECT>:
5477:
5478: The problem is open, and all tries have been used without getting the
5479: correct answer.
5480:
5481: =item * B<OPEN>:
5482:
5483: The item is open and not yet tried.
5484:
5485: =item * B<ATTEMPTED>:
5486:
5487: The problem has been attempted.
5488:
5489: =item * B<CREDIT_ATTEMPTED>:
5490:
5491: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
5492:
5493: =item * B<ANSWER_SUBMITTED>:
5494:
5495: An answer has been submitted, but the student should not see it.
5496:
5497: =back
5498:
5499: =cut
5500:
5501: sub TRIES_LEFT { return 20; }
5502: sub ANSWER_SUBMITTED { return 21; }
5503: sub PARTIALLY_CORRECT { return 22; }
5504:
5505: sub RESERVED_LATER { return 30; }
5506: sub RESERVED { return 31; }
5507: sub RESERVED_LOCATION { return 32; }
5508: sub RESERVABLE { return 33; }
5509: sub RESERVABLE_LATER { return 34; }
5510: sub NOTRESERVABLE { return 35; }
5511: sub NOT_IN_A_SLOT { return 36; }
5512: sub NEEDS_CHECKIN { return 37; }
5513: sub WAITING_FOR_GRADE { return 38; }
5514: sub UNKNOWN { return 39; }
5515:
5516: sub status {
5517: my $self = shift;
5518: my $part = shift;
5519: if (!defined($part)) { $part = "0"; }
5520: my $completionStatus = $self->getCompletionStatus($part);
5521: my $dateStatus = $self->getDateStatus($part);
5522:
5523: # What we have is a two-dimensional matrix with 4 entries on one
5524: # dimension and 5 entries on the other, which we want to colorize,
5525: # plus network failure and "no date data at all".
5526:
5527: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
5528: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
5529:
5530: my $suppressFeedback = 0;
5531: if (($self->problemstatus($part) eq 'no') ||
5532: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5533: $suppressFeedback = 1;
5534: }
5535: # If there's an answer date and we're past it, don't
5536: # suppress the feedback; student should know
5537: if ($self->duedate($part) && $self->duedate($part) < time() &&
5538: $self->answerdate($part) && $self->answerdate($part) < time()) {
5539: $suppressFeedback = 0;
5540: }
5541:
5542: # There are a few whole rows we can dispose of:
5543: if ($completionStatus == CORRECT ||
5544: $completionStatus == CORRECT_BY_OVERRIDE ) {
5545: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5546: my $awarded=$self->awarded($part);
5547: if ($awarded < 1 && $awarded > 0) {
5548: return PARTIALLY_CORRECT;
5549: } elsif ($awarded<1) {
5550: return INCORRECT;
5551: }
5552: return CORRECT;
5553: }
5554:
5555: # If it's WRONG... and not open
5556: if ( ($completionStatus == INCORRECT ||
5557: $completionStatus == INCORRECT_BY_OVERRIDE)
5558: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5559: return INCORRECT;
5560: }
5561:
5562: if ($completionStatus == ATTEMPTED) {
5563: return ATTEMPTED;
5564: }
5565:
5566: if ($completionStatus == CREDIT_ATTEMPTED) {
5567: return CREDIT_ATTEMPTED;
5568: }
5569:
5570: # If it's EXCUSED, then return that no matter what
5571: if ($completionStatus == EXCUSED) {
5572: return EXCUSED;
5573: }
5574:
5575: if ($dateStatus == NOTHING_SET) {
5576: return NOTHING_SET;
5577: }
5578:
5579: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5580: # by 4 matrix (date statuses).
5581:
5582: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5583: $dateStatus == PAST_DUE_NO_ANSWER ) {
5584: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5585: }
5586:
5587: if ($dateStatus == ANSWER_OPEN) {
5588: return ANSWER_OPEN;
5589: }
5590:
5591: # Now: (incorrect, incorrect_override, not_attempted) x
5592: # (open_later), (open)
5593:
5594: if ($dateStatus == OPEN_LATER) {
5595: return OPEN_LATER;
5596: }
5597:
5598: # If it's WRONG...
5599: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5600: # and there are TRIES LEFT:
5601: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5602: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5603: }
5604: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5605: }
5606:
5607: # Otherwise, it's untried and open
5608: return OPEN;
5609: }
5610:
5611: sub check_for_slot {
5612: my $self = shift;
5613: my $part = shift;
5614: my $symb = $self->{SYMB};
5615: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5616: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5617: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5618: my $cid=$env{'request.course.id'};
5619: my $cdom=$env{'course.'.$cid.'.domain'};
5620: my $cnum=$env{'course.'.$cid.'.num'};
5621: my $now = time;
5622: my $num_usable_slots = 0;
5623: my ($checkedin,$checkedinslot,%consumed_uniq,%slots);
5624: if (@slots > 0) {
5625: %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5626: if (&Apache::lonnet::error(%slots)) {
5627: return (UNKNOWN);
5628: }
5629: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
5630: foreach my $slot_name (@sorted_slots) {
5631: next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
5632: my $end = $slots{$slot_name}->{'endtime'};
5633: my $start = $slots{$slot_name}->{'starttime'};
5634: my $ip = $slots{$slot_name}->{'ip'};
5635: if ($self->simpleStatus() == OPEN) {
5636: if ($end > $now) {
5637: if ($start > $now) {
5638: return (RESERVED_LATER,$start,$slot_name);
5639: } else {
5640: if ($ip ne '') {
5641: if (!&Apache::loncommon::check_ip_acc($ip)) {
5642: return (RESERVED_LOCATION,$end,$slot_name);
5643: }
5644: }
5645: my @proctors;
5646: if ($slots{$slot_name}->{'proctor'} ne '') {
5647: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5648: }
5649: if (@proctors > 0) {
5650: ($checkedin,$checkedinslot) = $self->checkedin();
5651: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5652: ($checkedinslot eq $slot_name)) {
5653: return (NEEDS_CHECKIN,$end,$slot_name);
5654: }
5655: }
5656: return (RESERVED,$end,$slot_name);
5657: }
5658: }
5659: } elsif ($end > $now) {
5660: $num_usable_slots ++;
5661: }
5662: }
5663: my ($is_correct,$wait_for_grade);
5664: if ($self->is_task()) {
5665: my $taskstatus = $self->taskstatus();
5666: $is_correct = (($taskstatus eq 'pass') ||
5667: ($self->solved() =~ /^correct_/));
5668: unless ($taskstatus =~ /^(?:pass|fail)$/) {
5669: $wait_for_grade = 1;
5670: }
5671: } else {
5672: unless ($self->completable()) {
5673: $wait_for_grade = 1;
5674: }
5675: unless (($self->problemstatus($part) eq 'no') ||
5676: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5677: $is_correct = ($self->solved($part) =~ /^correct_/);
5678: $wait_for_grade = 0;
5679: }
5680: }
5681: ($checkedin,$checkedinslot) = $self->checkedin();
5682: if ($checkedin) {
5683: if (ref($slots{$checkedinslot}) eq 'HASH') {
5684: $consumed_uniq{$checkedinslot} = $slots{$checkedinslot}{'uniqueperiod'};
5685: }
5686: if ($wait_for_grade) {
5687: return (WAITING_FOR_GRADE);
5688: } elsif ($is_correct) {
5689: return (CORRECT);
5690: }
5691: }
5692: if ($num_usable_slots) {
5693: return(NOT_IN_A_SLOT);
5694: }
5695: }
5696: my $reservable = &Apache::lonnet::get_reservable_slots($cnum,$cdom,$env{'user.name'},
5697: $env{'user.domain'});
5698: if (ref($reservable) eq 'HASH') {
5699: if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
5700: foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
5701: my $canuse;
5702: if (($reservable->{'now'}{$slot}{'symb'} eq '') ||
5703: ($reservable->{'now'}{$slot}{'symb'} eq $symb)) {
5704: $canuse = 1;
5705: }
5706: if ($canuse) {
5707: if ($checkedin) {
5708: if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
5709: my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
5710: if ($reservable->{'now'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
5711: my ($new_uniq_start,$new_uniq_end) = ($1,$2);
5712: next if (!
5713: ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
5714: ($uniqstart > $new_uniq_end && $uniqend > $new_uniq_end ));
5715: }
5716: }
5717: }
5718: return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
5719: }
5720: }
5721: }
5722: if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
5723: foreach my $slot (@{$reservable->{'future_order'}}) {
5724: my $canuse;
5725: if (($reservable->{'future'}{$slot}{'symb'} eq '') ||
5726: ($reservable->{'future'}{$slot}{'symb'} eq $symb)) {
5727: $canuse = 1;
5728: }
5729: if ($canuse) {
5730: if ($checkedin) {
5731: if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
5732: my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
5733: if ($reservable->{'future'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
5734: my ($new_uniq_start,$new_uniq_end) = ($1,$2);
5735: next if (!
5736: ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
5737: ($uniqstart > $new_uniq_end && $uniqend > $new_uniq_end ));
5738: }
5739: }
5740: }
5741: return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
5742: }
5743: }
5744: }
5745: }
5746: return(NOTRESERVABLE);
5747: }
5748: return;
5749: }
5750:
5751: sub CLOSED { return 23; }
5752: sub ERROR { return 24; }
5753:
5754: =pod
5755:
5756: B<Simple Status>
5757:
5758: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5759: "Simple status" corresponds to "which icon is shown on the
5760: Navmaps". There are six "simple" statuses:
5761:
5762: =over 4
5763:
5764: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5765:
5766: =item * B<OPEN>: The problem is open and unattempted.
5767:
5768: =item * B<CORRECT>: The problem is correct for any reason.
5769:
5770: =item * B<INCORRECT>: The problem is incorrect and can still be
5771: completed successfully.
5772:
5773: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5774: does not know if they are correct. (The ellipsis icon.)
5775:
5776: =item * B<ERROR>: There is an error retrieving information about this
5777: problem.
5778:
5779: =back
5780:
5781: =cut
5782:
5783: # This hash maps the composite status to this simple status, and
5784: # can be used directly, if you like
5785: my %compositeToSimple =
5786: (
5787: NETWORK_FAILURE() => ERROR,
5788: NOTHING_SET() => CLOSED,
5789: CORRECT() => CORRECT,
5790: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5791: EXCUSED() => CORRECT,
5792: PAST_DUE_NO_ANSWER() => INCORRECT,
5793: PAST_DUE_ANSWER_LATER() => INCORRECT,
5794: ANSWER_OPEN() => INCORRECT,
5795: OPEN_LATER() => CLOSED,
5796: TRIES_LEFT() => OPEN,
5797: INCORRECT() => INCORRECT,
5798: OPEN() => OPEN,
5799: ATTEMPTED() => ATTEMPTED,
5800: CREDIT_ATTEMPTED() => CORRECT,
5801: ANSWER_SUBMITTED() => ATTEMPTED
5802: );
5803:
5804: sub simpleStatus {
5805: my $self = shift;
5806: my $part = shift;
5807: my $status = $self->status($part);
5808: return $compositeToSimple{$status};
5809: }
5810:
5811: =pod
5812:
5813: B<simpleStatusCount> will return an array reference containing, in
5814: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5815: and ERROR parts the given problem has.
5816:
5817: =cut
5818:
5819: # This maps the status to the slot we want to increment
5820: my %statusToSlotMap =
5821: (
5822: OPEN() => 0,
5823: CLOSED() => 1,
5824: CORRECT() => 2,
5825: INCORRECT() => 3,
5826: ATTEMPTED() => 4,
5827: ERROR() => 5
5828: );
5829:
5830: sub statusToSlot { return $statusToSlotMap{shift()}; }
5831:
5832: sub simpleStatusCount {
5833: my $self = shift;
5834:
5835: my @counts = (0, 0, 0, 0, 0, 0, 0);
5836: foreach my $part (@{$self->parts()}) {
5837: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5838: }
5839:
5840: return \@counts;
5841: }
5842:
5843: =pod
5844:
5845: B<Completable>
5846:
5847: The completable method represents the concept of I<whether the student can
5848: currently do the problem>. If the student can do the problem, which means
5849: that it is open, there are tries left, and if the problem is manually graded
5850: or the grade is suppressed via problemstatus, the student has not tried it
5851: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5852: either the student has tried it and there is no feedback, or that for
5853: some reason it is no longer completable (not open yet, successfully completed,
5854: out of tries, etc.). As an example, this is used as the filter for the
5855: "Uncompleted Homework" option for the nav maps.
5856:
5857: If this does not quite meet your needs, do not fiddle with it (unless you are
5858: fixing it to better match the student's conception of "completable" because
5859: it's broken somehow)... make a new method.
5860:
5861: =cut
5862:
5863: sub completable {
5864: my $self = shift;
5865: if (!$self->is_problem()) { return 0; }
5866: my $partCount = $self->countParts();
5867:
5868: foreach my $part (@{$self->parts()}) {
5869: if ($part eq '0' && $partCount != 1) { next; }
5870: my $status = $self->status($part);
5871: # "If any of the parts are open, or have tries left (implies open),
5872: # and it is not "attempted" (manually graded problem), it is
5873: # not "complete"
5874: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5875: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5876: $status == ANSWER_SUBMITTED() ) {
5877: # did this part already, as well as we can
5878: next;
5879: }
5880: if ($status == OPEN() || $status == TRIES_LEFT()) {
5881: return 1;
5882: }
5883: }
5884:
5885: # If all the parts were complete, so was this problem.
5886: return 0;
5887: }
5888:
5889: =pod
5890:
5891: B<Answerable>
5892:
5893: The answerable method differs from the completable method in its handling of problem parts
5894: for which feedback on correctness is suppressed, but the student still has tries left, and
5895: the problem part is not past due, (i.e., the student could submit a different answer if
5896: he/she so chose). For that case completable will return 0, whereas answerable will return 1.
5897:
5898: =cut
5899:
5900: sub answerable {
5901: my $self = shift;
5902: if (!$self->is_problem()) { return 0; }
5903: my $partCount = $self->countParts();
5904: foreach my $part (@{$self->parts()}) {
5905: if ($part eq '0' && $partCount != 1) { next; }
5906: my $status = $self->status($part);
5907: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5908: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5909: $status == ANSWER_SUBMITTED() ) {
5910: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5911: return 1;
5912: }
5913: }
5914: if ($status == OPEN() || $status == TRIES_LEFT() || $status == NETWORK_FAILURE()) {
5915: return 1;
5916: }
5917: }
5918: # None of the parts were answerable, so neither is this problem.
5919: return 0;
5920: }
5921:
5922: =pod
5923:
5924: =head2 Resource/Nav Map Navigation
5925:
5926: =over 4
5927:
5928: =item * B<getNext>():
5929:
5930: Retreive an array of the possible next resources after this
5931: one. Always returns an array, even in the one- or zero-element case.
5932:
5933: =item * B<getPrevious>():
5934:
5935: Retreive an array of the possible previous resources from this
5936: one. Always returns an array, even in the one- or zero-element case.
5937:
5938: =cut
5939:
5940: sub getNext {
5941: my $self = shift;
5942: my @branches;
5943: my $to = $self->to();
5944: foreach my $branch ( split(/,/, $to) ) {
5945: my $choice = $self->{NAV_MAP}->getById($branch);
5946: #if (!$choice->condition()) { next; }
5947: my $next = $choice->goesto();
5948: $next = $self->{NAV_MAP}->getById($next);
5949:
5950: push @branches, $next;
5951: }
5952: return \@branches;
5953: }
5954:
5955: sub getPrevious {
5956: my $self = shift;
5957: my @branches;
5958: my $from = $self->from();
5959: foreach my $branch ( split(/,/, $from)) {
5960: my $choice = $self->{NAV_MAP}->getById($branch);
5961: my $prev = $choice->comesfrom();
5962: $prev = $self->{NAV_MAP}->getById($prev);
5963:
5964: push @branches, $prev;
5965: }
5966: return \@branches;
5967: }
5968:
5969: sub browsePriv {
5970: my $self = shift;
5971: my $noblockcheck = shift;
5972: if (defined($self->{BROWSE_PRIV})) {
5973: return $self->{BROWSE_PRIV};
5974: }
5975:
5976: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5977: $self->{SYMB},undef,
5978: undef,$noblockcheck);
5979: }
5980:
5981: =pod
5982:
5983: =back
5984:
5985: =cut
5986:
5987: 1;
5988:
5989: __END__
5990:
5991:
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