1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.509.2.5.4.2 2017/09/15 23:17:24 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->RESERVABLE_LATER) {
647: $slotmsg = &mt('Reservable, reservations open [_1]',
648: timeToHumanString($slot_time,'start'));
649: } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
650: $slotmsg = &mt('Reserve a time/place to work');
651: } elsif ($slot_status == $res->NOTRESERVABLE) {
652: $slotmsg = &mt('Reservation not available');
653: } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
654: $slotmsg = &mt('Submission in grading queue');
655: }
656: if ($slotmsg) {
657: if ($res->is_task() || !$due) {
658: return $slotmsg;
659: }
660: $slotinfo = (' ' x 2).'('.$slotmsg.')';
661: }
662: }
663: }
664: if ($status == $res->OPEN) {
665: if ($due) {
666: if ($res->is_practice()) {
667: return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part)).$slotinfo;
668: } else {
669: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)).$slotinfo;
670: }
671: } else {
672: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part).$slotinfo;
673: }
674: }
675: if ($status == $res->PAST_DUE_ANSWER_LATER) {
676: return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start'),$res->symb(),'answerdate',$part));
677: }
678: if ($status == $res->PAST_DUE_NO_ANSWER) {
679: if ($res->is_practice()) {
680: return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'answerdate,duedate',$part));
681: } else {
682: return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'answerdate,duedate',$part));
683: }
684: }
685: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
686: && $res->handgrade($part) ne 'yes') {
687: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Answer available"),$res->symb(),'answerdate,duedate',$part);
688: }
689: if ($status == $res->EXCUSED) {
690: return &mt("Excused by instructor");
691: }
692: if ($status == $res->ATTEMPTED) {
693: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
694: return &mt("Survey submission recorded");
695: } else {
696: return &mt("Answer submitted, not yet graded");
697: }
698: }
699: if ($status == $res->CREDIT_ATTEMPTED) {
700: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
701: return &mt("Credit for survey submission");
702: }
703: }
704: if ($status == $res->TRIES_LEFT) {
705: my $tries = $res->tries($part);
706: my $maxtries = $res->maxtries($part);
707: my $triesString = "";
708: if ($tries && $maxtries) {
709: $triesString = '<span class="LC_fontsize_medium"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></span>';
710: if ($maxtries > 1 && $maxtries - $tries == 1) {
711: $triesString = "<b>$triesString</b>";
712: }
713: }
714: if ($due) {
715: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)) .
716: " $triesString";
717: } else {
718: return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
719: }
720: }
721: if ($status == $res->ANSWER_SUBMITTED) {
722: return &mt('Answer submitted');
723: }
724: }
725:
726:
727: sub dueInLessThan24Hours {
728: my $res = shift;
729: my $part = shift;
730: my $status = $res->status($part);
731:
732: return ($status == $res->OPEN() ||
733: $status == $res->TRIES_LEFT()) &&
734: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
735: $res->duedate($part) > time();
736: }
737:
738:
739: sub lastTry {
740: my $res = shift;
741: my $part = shift;
742:
743: my $tries = $res->tries($part);
744: my $maxtries = $res->maxtries($part);
745: return $tries && $maxtries && $maxtries > 1 &&
746: $maxtries - $tries == 1 && $res->duedate($part) &&
747: $res->duedate($part) > time();
748: }
749:
750:
751: sub advancedUser {
752: return $env{'request.role.adv'};
753: }
754:
755: sub timeToHumanString {
756: my ($time,$type,$format) = @_;
757:
758: # zero, '0' and blank are bad times
759: if (!$time) {
760: return &mt('never');
761: }
762: unless (&Apache::lonlocal::current_language()=~/^en/) {
763: return &Apache::lonlocal::locallocaltime($time);
764: }
765: my $now = time();
766:
767: # Positive = future
768: my $delta = $time - $now;
769:
770: my $minute = 60;
771: my $hour = 60 * $minute;
772: my $day = 24 * $hour;
773: my $week = 7 * $day;
774: my $inPast = 0;
775:
776: # Logic in comments:
777: # Is it now? (extremely unlikely)
778: if ( $delta == 0 ) {
779: return "this instant";
780: }
781:
782: if ($delta < 0) {
783: $inPast = 1;
784: $delta = -$delta;
785: }
786:
787: if ( $delta > 0 ) {
788:
789: my $tense = $inPast ? " ago" : "";
790: my $prefix = $inPast ? "" : "in ";
791:
792: # Less than a minute
793: if ( $delta < $minute ) {
794: if ($delta == 1) { return "${prefix}1 second$tense"; }
795: return "$prefix$delta seconds$tense";
796: }
797:
798: # Less than an hour
799: if ( $delta < $hour ) {
800: # If so, use minutes; or minutes, seconds (if format requires)
801: my $minutes = floor($delta / 60);
802: if (($format ne '') && ($format =~ /\%(T|S)/)) {
803: my $display;
804: if ($minutes == 1) {
805: $display = "${prefix}1 minute";
806: } else {
807: $display = "$prefix$minutes minutes";
808: }
809: my $seconds = $delta % $minute;
810: if ($seconds == 0) {
811: $display .= $tense;
812: } elsif ($seconds == 1) {
813: $display .= ", 1 second$tense";
814: } else {
815: $display .= ", $seconds seconds$tense";
816: }
817: return $display;
818: }
819: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
820: return "$prefix$minutes minutes$tense";
821: }
822:
823: # Is it less than 24 hours away? If so,
824: # display hours + minutes, (and + seconds, if format specified it)
825: if ( $delta < $hour * 24) {
826: my $hours = floor($delta / $hour);
827: my $minutes = floor(($delta % $hour) / $minute);
828: my $hourString = "$hours hours";
829: my $minuteString = ", $minutes minutes";
830: if ($hours == 1) {
831: $hourString = "1 hour";
832: }
833: if ($minutes == 1) {
834: $minuteString = ", 1 minute";
835: }
836: if ($minutes == 0) {
837: $minuteString = "";
838: }
839: if (($format ne '') && ($format =~ /\%(T|S)/)) {
840: my $display = "$prefix$hourString$minuteString";
841: my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
842: if ($seconds == 0) {
843: $display .= $tense;
844: } elsif ($seconds == 1) {
845: $display .= ", 1 second$tense";
846: } else {
847: $display .= ", $seconds seconds$tense";
848: }
849: return $display;
850: }
851: return "$prefix$hourString$minuteString$tense";
852: }
853:
854: # Date/time is more than 24 hours away
855:
856: my $dt = DateTime->from_epoch(epoch => $time)
857: ->set_time_zone(&Apache::lonlocal::gettimezone());
858:
859: # If there's a caller supplied format, use it, unless it only displays
860: # H:M:S or H:M.
861:
862: if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
863: my $timeStr = $dt->strftime($format);
864: return $timeStr.' ('.$dt->time_zone_short_name().')';
865: }
866:
867: # Less than 5 days away, display day of the week and
868: # HH:MM
869:
870: if ( $delta < $day * 5 ) {
871: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
872: $timeStr =~ s/12:00 am/00:00/;
873: $timeStr =~ s/12:00 pm/noon/;
874: return ($inPast ? "last " : "this ") .
875: $timeStr;
876: }
877:
878: my $conjunction='on';
879: if ($type eq 'start') {
880: $conjunction='at';
881: } elsif ($type eq 'end') {
882: $conjunction='by';
883: }
884: # Is it this year?
885: my $dt_now = DateTime->from_epoch(epoch => $now)
886: ->set_time_zone(&Apache::lonlocal::gettimezone());
887: if ( $dt->year() == $dt_now->year()) {
888: # Return on Month Day, HH:MM meridian
889: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
890: $timeStr =~ s/12:00 am/00:00/;
891: $timeStr =~ s/12:00 pm/noon/;
892: return $timeStr;
893: }
894:
895: # Not this year, so show the year
896: my $timeStr =
897: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
898: $timeStr =~ s/12:00 am/00:00/;
899: $timeStr =~ s/12:00 pm/noon/;
900: return $timeStr;
901: }
902: }
903:
904:
905: sub resource { return 0; }
906: sub communication_status { return 1; }
907: sub quick_status { return 2; }
908: sub long_status { return 3; }
909: sub part_status_summary { return 4; }
910:
911: sub render_resource {
912: my ($resource, $part, $params) = @_;
913:
914: my $editmapLink;
915: my $nonLinkedText = ''; # stuff after resource title not in link
916:
917: my $link = $params->{"resourceLink"};
918: if ($resource->ext()) {
919: $link =~ s/\#.+(\?)/$1/g;
920: }
921:
922: # The URL part is not escaped at this point, but the symb is...
923:
924: my $src = $resource->src();
925: my $it = $params->{"iterator"};
926: my $filter = $it->{FILTER};
927:
928: my $title = $resource->compTitle();
929:
930: my $partLabel = "";
931: my $newBranchText = "";
932: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
933: # If this is a new branch, label it so
934: if ($params->{'isNewBranch'}) {
935: $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
936: }
937:
938: # links to open and close the folder
939:
940: my $whitespace = $location.'/whitespace_21.gif';
941: my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
942: my $linkclose = "</a>";
943:
944: # Default icon: unknown page
945: my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
946:
947: if ($resource->is_problem()) {
948: if ($part eq '0' || $params->{'condensed'}) {
949: $icon = '<img class="LC_contentImage" src="'.$location.'/';
950: if ($resource->is_task()) {
951: $icon .= 'task.gif" alt="'.&mt('Task');
952: } else {
953: $icon .= 'problem.gif" alt="'.&mt('Problem');
954: }
955: $icon .='" />';
956: } else {
957: $icon = $params->{'indentString'};
958: }
959: } else {
960: $icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
961: }
962:
963: # Display the correct map icon to open or shut map
964: if ($resource->is_map()) {
965: my $mapId = $resource->map_pc();
966: my $nowOpen = !defined($filter->{$mapId});
967: if ($it->{CONDITION}) {
968: $nowOpen = !$nowOpen;
969: }
970:
971: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
972: my $title=$resource->title;
973: $title=~s/\"/\&qout;/g;
974: if (!$params->{'resource_no_folder_link'}) {
975: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
976: $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
977: ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
978: .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
979: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
980: $params->{'queryString'} . '&filter=';
981: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
982: addToFilter($filter, $mapId) :
983: removeFromFilter($filter, $mapId);
984: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
985: . $params->{'hereType'} . '&here=' .
986: &escape($params->{'here'}) .
987: '&jump=' .
988: &escape($resource->symb()) .
989: "&folderManip=1\">";
990:
991: } else {
992: # Don't allow users to manipulate folder
993: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
994: $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
995: if ($params->{'caller'} eq 'sequence') {
996: $linkopen = "<a href=\"$link\">";
997: } else {
998: $linkopen = "";
999: $linkclose = "";
1000: }
1001: }
1002: if (((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
1003: (&Apache::lonnet::allowed('cev',$env{'request.course.id'}))) &&
1004: ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/)) {
1005: if (!$params->{'map_no_edit_link'}) {
1006: my $icon = &Apache::loncommon::lonhttpdurl('/res/adm/pages').'/editmap.png';
1007: $editmapLink=' '.
1008: '<a href="/adm/coursedocs?command=directnav&symb='.&escape($resource->symb()).'">'.
1009: '<img src="'.$icon.'" alt="'.&mt('Edit Content').'" title="'.&mt('Edit Content').'" />'.
1010: '</a>';
1011: }
1012: }
1013: if ($params->{'mapHidden'} || $resource->randomout()) {
1014: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
1015: }
1016: } else {
1017: if ($resource->randomout()) {
1018: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
1019: }
1020: }
1021: if (!$resource->condval()) {
1022: $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
1023: }
1024: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
1025: $nonLinkedText .=' <span class="LC_info"><b>'.&mt('not graded').'</b></span>';
1026: }
1027:
1028: # We're done preparing and finally ready to start the rendering
1029: my $result = '<td class="LC_middle">';
1030: my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
1031:
1032: my $indentLevel = $params->{'indentLevel'};
1033: if ($newBranchText) { $indentLevel--; }
1034:
1035: # print indentation
1036: for (my $i = 0; $i < $indentLevel; $i++) {
1037: $result .= $params->{'indentString'};
1038: }
1039:
1040: # Decide what to display
1041: $result .= "$newBranchText$linkopen$icon$linkclose";
1042:
1043: my $curMarkerBegin = '';
1044: my $curMarkerEnd = '';
1045:
1046: # Is this the current resource?
1047: if (!$params->{'displayedHereMarker'} &&
1048: $resource->symb() eq $params->{'here'} ) {
1049: unless ($resource->is_map()) {
1050: $curMarkerBegin = '<span class="LC_current_nav_location">';
1051: $curMarkerEnd = '</span>';
1052: }
1053: $params->{'displayedHereMarker'} = 1;
1054: }
1055:
1056: if ($resource->is_problem() && $part ne '0' &&
1057: !$params->{'condensed'}) {
1058: my $displaypart=$resource->part_display($part);
1059: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1060: if ($link!~/\#/) { $link.='#'.&escape($part); }
1061: $title = "";
1062: }
1063:
1064: if ($params->{'condensed'} && $resource->countParts() > 1) {
1065: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1066: }
1067:
1068: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1069: $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$editmapLink$nonLinkedText</td>";
1070: } else {
1071: $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$editmapLink$nonLinkedText</td>";
1072: }
1073:
1074: return $result;
1075: }
1076:
1077: sub render_communication_status {
1078: my ($resource, $part, $params) = @_;
1079: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1080:
1081: my $link = $params->{"resourceLink"};
1082: my $linkopen = "<a href=\"$link\">";
1083: my $linkclose = "</a>";
1084: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1085:
1086: if ($resource->hasDiscussion()) {
1087: $discussionHTML = $linkopen .
1088: '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1089: $linkclose;
1090: }
1091:
1092: if ($resource->getFeedback()) {
1093: my $feedback = $resource->getFeedback();
1094: foreach my $msgid (split(/\,/, $feedback)) {
1095: if ($msgid) {
1096: $feedbackHTML .= ' <a href="/adm/email?display='
1097: . &escape($msgid) . '">'
1098: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1099: }
1100: }
1101: }
1102:
1103: if ($resource->getErrors()) {
1104: my $errors = $resource->getErrors();
1105: my $errorcount = 0;
1106: foreach my $msgid (split(/,/, $errors)) {
1107: last if ($errorcount>=10); # Only output 10 bombs maximum
1108: if ($msgid) {
1109: $errorcount++;
1110: $errorHTML .= ' <a href="/adm/email?display='
1111: . &escape($msgid) . '">'
1112: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1113: }
1114: }
1115: }
1116:
1117: if ($params->{'multipart'} && $part != '0') {
1118: $discussionHTML = $feedbackHTML = $errorHTML = '';
1119: }
1120: return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1121:
1122: }
1123: sub render_quick_status {
1124: my ($resource, $part, $params) = @_;
1125: my $result = "";
1126: my $firstDisplayed = !$params->{'condensed'} &&
1127: $params->{'multipart'} && $part eq "0";
1128:
1129: my $link = $params->{"resourceLink"};
1130: my $linkopen = "<a href=\"$link\">";
1131: my $linkclose = "</a>";
1132:
1133: $result .= '<td class="LC_middle">';
1134: if ($resource->is_problem() &&
1135: !$firstDisplayed) {
1136: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1137: my $alt = $iconAltTags{$icon};
1138: if ($icon) {
1139: my $location=
1140: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1141: $result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;
1142: } else {
1143: $result .= " ";
1144: }
1145: } else { # not problem, no icon
1146: $result .= " ";
1147: }
1148: $result .= "</td>\n";
1149: return $result;
1150: }
1151: sub render_long_status {
1152: my ($resource, $part, $params) = @_;
1153: my $result = '<td class="LC_middle LC_right">';
1154: my $firstDisplayed = !$params->{'condensed'} &&
1155: $params->{'multipart'} && $part eq "0";
1156:
1157: my $color;
1158: my $info = '';
1159: if ($resource->is_problem() || $resource->is_practice()) {
1160: $color = $colormap{$resource->status};
1161:
1162: if (dueInLessThan24Hours($resource, $part)) {
1163: $color = $hurryUpColor;
1164: $info = ' title="'.&mt('Due in less than 24 hours!').'"';
1165: } elsif (lastTry($resource, $part)) {
1166: unless (($resource->problemstatus($part) eq 'no') ||
1167: ($resource->problemstatus($part) eq 'no_feedback_ever')) {
1168: $color = $hurryUpColor;
1169: $info = ' title="'.&mt('One try remaining!').'"';
1170: }
1171: }
1172: }
1173:
1174: if ($resource->kind() eq "res" &&
1175: $resource->is_raw_problem() &&
1176: !$firstDisplayed) {
1177: if ($color) {$result .= '<span style="color:'.$color.'"'.$info.'><b>'; }
1178: $result .= getDescription($resource, $part);
1179: if ($color) {$result .= "</b></span>"; }
1180: }
1181: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1182: $result .= &mt('(randomly select [_1])', $resource->randompick());
1183: }
1184: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1185: $result .= &mt('(randomly ordered)');
1186: }
1187:
1188: # Debugging code
1189: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1190: # ' - Part: ' . $part;
1191:
1192: $result .= "</td>\n";
1193:
1194: return $result;
1195: }
1196:
1197: # Colors obtained by taking the icons, matching the colors, and
1198: # possibly reducing the Value (HSV) of the color, if it's too bright
1199: # for text, generally by one third or so.
1200: my %statusColors =
1201: (
1202: $resObj->CLOSED => '#000000',
1203: $resObj->OPEN => '#998b13',
1204: $resObj->CORRECT => '#26933f',
1205: $resObj->INCORRECT => '#c48207',
1206: $resObj->ATTEMPTED => '#a87510',
1207: $resObj->ERROR => '#000000'
1208: );
1209: my %statusStrings =
1210: (
1211: $resObj->CLOSED => 'Not yet open',
1212: $resObj->OPEN => 'Open',
1213: $resObj->CORRECT => 'Correct',
1214: $resObj->INCORRECT => 'Incorrect',
1215: $resObj->ATTEMPTED => 'Attempted',
1216: $resObj->ERROR => 'Network Error'
1217: );
1218: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1219:
1220: sub render_parts_summary_status {
1221: my ($resource, $part, $params) = @_;
1222: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1223: if ($params->{showParts}) {
1224: return '<td></td>';
1225: }
1226:
1227: my $td = "<td align='right'>\n";
1228: my $endtd = "</td>\n";
1229: my @probs;
1230:
1231: if ($resource->contains_problem) {
1232: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1233: } else {
1234: @probs=($resource);
1235: }
1236: my $return;
1237: my %overallstatus;
1238: my $totalParts;
1239: foreach my $resource (@probs) {
1240: # If there is a single part, just show the simple status
1241: if ($resource->singlepart()) {
1242: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1243: $overallstatus{$status}++;
1244: $totalParts++;
1245: next;
1246: }
1247: # Now we can be sure the $part doesn't really matter.
1248: my $statusCount = $resource->simpleStatusCount();
1249: my @counts;
1250: foreach my $status (@statuses) {
1251: # decouple display order from the simpleStatusCount order
1252: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1253: if ($statusCount->[$slot]) {
1254: $overallstatus{$status}+=$statusCount->[$slot];
1255: $totalParts+=$statusCount->[$slot];
1256: }
1257: }
1258: }
1259: $return.= $td . $totalParts . ' parts: ';
1260: foreach my $status (@statuses) {
1261: if ($overallstatus{$status}) {
1262: $return.='<span style="color:' . $statusColors{$status}
1263: . '">' . $overallstatus{$status} . ' '
1264: . $statusStrings{$status} . '</span>';
1265: }
1266: }
1267: $return.= $endtd;
1268: return $return;
1269: }
1270:
1271: my @preparedColumns = (\&render_resource, \&render_communication_status,
1272: \&render_quick_status, \&render_long_status,
1273: \&render_parts_summary_status);
1274:
1275: sub setDefault {
1276: my ($val, $default) = @_;
1277: if (!defined($val)) { return $default; }
1278: return $val;
1279: }
1280:
1281: sub cmp_title {
1282: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1283: $atitle=~s/^\s*//;
1284: $btitle=~s/^\s*//;
1285: return $atitle cmp $btitle;
1286: }
1287:
1288: sub render {
1289: my $args = shift;
1290: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1291: my $result = '';
1292: # Configure the renderer.
1293: my $cols = $args->{'cols'};
1294: if (!defined($cols)) {
1295: # no columns, no nav maps.
1296: return '';
1297: }
1298: my $navmap;
1299: if (defined($args->{'navmap'})) {
1300: $navmap = $args->{'navmap'};
1301: }
1302:
1303: my $r = $args->{'r'};
1304: my $queryString = $args->{'queryString'};
1305: my $jump = $args->{'jump'};
1306: my $here = $args->{'here'};
1307: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1308: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1309: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1310: # before the current resource when using #current
1311:
1312: # If we were passed 'here' information, we are not rendering
1313: # after a folder manipulation, and we were not passed an
1314: # iterator, make sure we open the folders to show the "here"
1315: # marker
1316: my $filterHash = {};
1317: # Figure out what we're not displaying
1318: foreach my $item (split(/\,/, $env{"form.filter"})) {
1319: if ($item) {
1320: $filterHash->{$item} = "1";
1321: }
1322: }
1323:
1324: # Filter: Remember filter function and add our own filter: Refuse
1325: # to show hidden resources unless the user can see them.
1326: my $userCanSeeHidden = advancedUser();
1327: my $filterFunc = setDefault($args->{'filterFunc'},
1328: sub {return 1;});
1329: if (!$userCanSeeHidden) {
1330: # Without renaming the filterfunc, the server seems to go into
1331: # an infinite loop
1332: my $oldFilterFunc = $filterFunc;
1333: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1334: &$oldFilterFunc($res);};
1335: }
1336:
1337: my $condition = 0;
1338: if ($env{'form.condition'}) {
1339: $condition = 1;
1340: }
1341:
1342: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1343: # Step 1: Check to see if we have a navmap
1344: if (!defined($navmap)) {
1345: $navmap = Apache::lonnavmaps::navmap->new();
1346: if (!defined($navmap)) {
1347: # no longer in course
1348: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1349: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1350: }
1351: }
1352:
1353: # Step two: Locate what kind of here marker is necessary
1354: # Determine where the "here" marker is and where the screen jumps to.
1355:
1356: if ($env{'form.postsymb'} ne '') {
1357: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1358: } elsif ($env{'form.postdata'} ne '') {
1359: # couldn't find a symb, is there a URL?
1360: my $currenturl = $env{'form.postdata'};
1361: #$currenturl=~s/^http\:\/\///;
1362: #$currenturl=~s/^[^\/]+//;
1363: unless ($args->{'caller'} eq 'sequence') {
1364: $here = $jump = &Apache::lonnet::symbread($currenturl);
1365: }
1366: }
1367: if (($here eq '') && ($args->{'caller'} ne 'sequence')) {
1368: my $last;
1369: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1370: &GDBM_READER(),0640)) {
1371: $last=$hash{'last_known'};
1372: untie(%hash);
1373: }
1374: if ($last) { $here = $jump = $last; }
1375: }
1376:
1377: # Step three: Ensure the folders are open
1378: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1379: my $curRes;
1380: my $found = 0;
1381:
1382: # We only need to do this if we need to open the maps to show the
1383: # current position. This will change the counter so we can't count
1384: # for the jump marker with this loop.
1385: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1386: if (ref($curRes) && $curRes->symb() eq $here) {
1387: my $mapStack = $mapIterator->getStack();
1388:
1389: # Ensure the parent maps are open
1390: for my $map (@{$mapStack}) {
1391: if ($condition) {
1392: undef $filterHash->{$map->map_pc()};
1393: } else {
1394: $filterHash->{$map->map_pc()} = 1;
1395: }
1396: }
1397: $found = 1;
1398: }
1399: }
1400: }
1401:
1402: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1403: # If this is a click on a folder or something, we want to preserve the "here"
1404: # from the querystring, and get the new "jump" marker
1405: $here = $env{'form.here'};
1406: $jump = $env{'form.jump'};
1407: }
1408:
1409: my $it = $args->{'iterator'};
1410: if (!defined($it)) {
1411: # Construct a default iterator based on $env{'form.'} information
1412:
1413: # Step 1: Check to see if we have a navmap
1414: if (!defined($navmap)) {
1415: $navmap = Apache::lonnavmaps::navmap->new();
1416: if (!defined($navmap)) {
1417: # no longer in course
1418: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1419: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1420: }
1421: }
1422:
1423: # See if we're being passed a specific map
1424: if ($args->{'iterator_map'}) {
1425: my $map = $args->{'iterator_map'};
1426: $map = $navmap->getResourceByUrl($map);
1427: my $firstResource = $map->map_start();
1428: my $finishResource = $map->map_finish();
1429:
1430: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1431: } else {
1432: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1433: }
1434: }
1435:
1436: # (re-)Locate the jump point, if any
1437: # Note this does not take filtering or hidden into account... need
1438: # to be fixed?
1439: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1440: my $curRes;
1441: my $foundJump = 0;
1442: my $counter = 0;
1443:
1444: while (($curRes = $mapIterator->next()) && !$foundJump) {
1445: if (ref($curRes)) { $counter++; }
1446:
1447: if (ref($curRes) && $jump eq $curRes->symb()) {
1448:
1449: # This is why we have to use the main iterator instead of the
1450: # potentially faster DFS: The count has to be the same, so
1451: # the order has to be the same, which DFS won't give us.
1452: $args->{'currentJumpIndex'} = $counter;
1453: $foundJump = 1;
1454: }
1455: }
1456:
1457: my $showParts = setDefault($args->{'showParts'}, 1);
1458: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1459: # keeps track of when the current resource is found,
1460: # so we can back up a few and put the anchor above the
1461: # current resource
1462: my $printKey = $args->{'printKey'};
1463: my $printCloseAll = $args->{'printCloseAll'};
1464: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1465:
1466: # Print key?
1467: if ($printKey) {
1468: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1469: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1470: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1471: if ($navmap->{LAST_CHECK}) {
1472: $result .=
1473: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1474: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1475: '</td><td align="center" valign="bottom"> '.
1476: '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1477: '</td>';
1478: } else {
1479: $result .= '<td align="center" valign="bottom"> '.
1480: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1481: ' <img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1482: '</td>';
1483: }
1484:
1485: $result .= '</tr></table>';
1486: }
1487:
1488: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1489: my ($link,$text);
1490: if ($condition) {
1491: $link='navmaps?condition=0&filter=&'.$queryString.
1492: '&here='.&escape($here);
1493: $text='Close all folders';
1494: } else {
1495: $link='navmaps?condition=1&filter=&'.$queryString.
1496: '&here='.&escape($here);
1497: $text='Open all folders';
1498: }
1499: if ($env{'form.register'}) {
1500: $link .= '&register='.$env{'form.register'};
1501: }
1502: if ($args->{'caller'} eq 'navmapsdisplay') {
1503: unless ($args->{'notools'}) {
1504: &add_linkitem($args->{'linkitems'},'changefolder',
1505: "location.href='$link'",$text);
1506: }
1507: } else {
1508: $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1509: }
1510: $result .= "\n";
1511: }
1512:
1513: # Check for any unread discussions in all resources.
1514: if (($args->{'caller'} eq 'navmapsdisplay') && (!$args->{'notools'})) {
1515: &add_linkitem($args->{'linkitems'},'clearbubbles',
1516: 'document.clearbubbles.submit()',
1517: 'Mark all posts read');
1518: my $time=time;
1519: my $querystr = &HTML::Entities::encode($ENV{'QUERY_STRING'},'<>&"');
1520: $result .= (<<END);
1521: <form name="clearbubbles" method="post" action="/adm/feedback">
1522: <input type="hidden" name="navurl" value="$querystr" />
1523: <input type="hidden" name="navtime" value="$time" />
1524: END
1525: if ($env{'form.register'}) {
1526: $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
1527: }
1528: if ($args->{'sort'} eq 'discussion') {
1529: my $totdisc = 0;
1530: my $haveDisc = '';
1531: my @allres=$navmap->retrieveResources();
1532: foreach my $resource (@allres) {
1533: if ($resource->hasDiscussion()) {
1534: $haveDisc .= $resource->wrap_symb().':';
1535: $totdisc ++;
1536: }
1537: }
1538: if ($totdisc > 0) {
1539: $haveDisc =~ s/:$//;
1540: $result .= (<<END);
1541: <input type="hidden" name="navmaps" value="$haveDisc" />
1542: </form>
1543: END
1544: }
1545: }
1546: $result.='</form>';
1547: }
1548: if (($args->{'caller'} eq 'navmapsdisplay') &&
1549: ((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
1550: (&Apache::lonnet::allowed('cev',$env{'request.course.id'})))) {
1551: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1552: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
1553: if ($env{'course.'.$env{'request.course.id'}.'.url'} eq
1554: "uploaded/$cdom/$cnum/default.sequence") {
1555: &add_linkitem($args->{'linkitems'},'edittoplevel',
1556: "javascript:gocmd('/adm/coursedocs','editdocs');",
1557: 'Content Editor');
1558: }
1559: }
1560:
1561: if ($args->{'caller'} eq 'navmapsdisplay') {
1562: $result .= &show_linkitems_toolbar($args,$condition);
1563: } elsif ($args->{'sort_html'}) {
1564: $result.=$args->{'sort_html'};
1565: }
1566:
1567: #$result .= "<br />\n";
1568: if ($r) {
1569: $r->print($result);
1570: $r->rflush();
1571: $result = "";
1572: }
1573: # End parameter setting
1574:
1575: $result .= "<br />\n";
1576:
1577: # Data
1578: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1579:
1580: my $res = "Apache::lonnavmaps::resource";
1581: my %condenseStatuses =
1582: ( $res->NETWORK_FAILURE => 1,
1583: $res->NOTHING_SET => 1,
1584: $res->CORRECT => 1 );
1585:
1586: # Shared variables
1587: $args->{'counter'} = 0; # counts the rows
1588: $args->{'indentLevel'} = 0;
1589: $args->{'isNewBranch'} = 0;
1590: $args->{'condensed'} = 0;
1591:
1592: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1593: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1594: $args->{'displayedHereMarker'} = 0;
1595:
1596: # If we're suppressing empty sequences, look for them here.
1597: # We also do this even if $args->{'suppressEmptySequences'}
1598: # is not true, so we can hide empty sequences for which the
1599: # hiddenresource parameter is set to yes (at map level), or
1600: # mark as hidden for users who have $userCanSeeHidden.
1601: # Use DFS for speed, since structure actually doesn't matter,
1602: # except what map has what resources.
1603:
1604: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1605: $it->{FIRST_RESOURCE},
1606: $it->{FINISH_RESOURCE},
1607: {}, undef, 1);
1608:
1609: my $depth = 0;
1610: $dfsit->next();
1611: my $curRes = $dfsit->next();
1612: while ($depth > -1) {
1613: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1614: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1615:
1616: if (ref($curRes)) {
1617: # Parallel pre-processing: Do sequences have non-filtered-out children?
1618: if ($curRes->is_map()) {
1619: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1620: # Sequences themselves do not count as visible children,
1621: # unless those sequences also have visible children.
1622: # This means if a sequence appears, there's a "promise"
1623: # that there's something under it if you open it, somewhere.
1624: } elsif ($curRes->src()) {
1625: # Not a sequence: if it's filtered, ignore it, otherwise
1626: # rise up the stack and mark the sequences as having children
1627: if (&$filterFunc($curRes)) {
1628: for my $sequence (@{$dfsit->getStack()}) {
1629: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1630: }
1631: }
1632: }
1633: }
1634: } continue {
1635: $curRes = $dfsit->next();
1636: }
1637:
1638: my $displayedJumpMarker = 0;
1639: # Set up iteration.
1640: my $now = time();
1641: my $in24Hours = $now + 24 * 60 * 60;
1642: my $rownum = 0;
1643:
1644: # export "here" marker information
1645: $args->{'here'} = $here;
1646:
1647: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1648: my @resources;
1649: my $code='';# sub { !(shift->is_map();) };
1650: if ($args->{'sort'} eq 'title') {
1651: my $oldFilterFunc = $filterFunc;
1652: my $filterFunc=
1653: sub {
1654: my ($res)=@_;
1655: if ($res->is_map()) { return 0;}
1656: return &$oldFilterFunc($res);
1657: };
1658: @resources=$navmap->retrieveResources(undef,$filterFunc);
1659: @resources= sort { &cmp_title($a,$b) } @resources;
1660: } elsif ($args->{'sort'} eq 'duedate') {
1661: my $oldFilterFunc = $filterFunc;
1662: my $filterFunc=
1663: sub {
1664: my ($res)=@_;
1665: if (!$res->is_problem()) { return 0;}
1666: return &$oldFilterFunc($res);
1667: };
1668: @resources=$navmap->retrieveResources(undef,$filterFunc);
1669: @resources= sort {
1670: if ($a->duedate ne $b->duedate) {
1671: return $a->duedate cmp $b->duedate;
1672: }
1673: my $value=&cmp_title($a,$b);
1674: return $value;
1675: } @resources;
1676: } elsif ($args->{'sort'} eq 'discussion') {
1677: my $oldFilterFunc = $filterFunc;
1678: my $filterFunc=
1679: sub {
1680: my ($res)=@_;
1681: if (!$res->hasDiscussion() &&
1682: !$res->getFeedback() &&
1683: !$res->getErrors()) { return 0;}
1684: return &$oldFilterFunc($res);
1685: };
1686: @resources=$navmap->retrieveResources(undef,$filterFunc);
1687: @resources= sort { &cmp_title($a,$b) } @resources;
1688: } else {
1689: #unknow sort mechanism or default
1690: undef($args->{'sort'});
1691: }
1692:
1693:
1694: while (1) {
1695: if ($args->{'sort'}) {
1696: $curRes = shift(@resources);
1697: } else {
1698: $curRes = $it->next($closeAllPages);
1699: }
1700: if (!$curRes) { last; }
1701:
1702: # Maintain indentation level.
1703: if ($curRes == $it->BEGIN_MAP() ||
1704: $curRes == $it->BEGIN_BRANCH() ) {
1705: $args->{'indentLevel'}++;
1706: }
1707: if ($curRes == $it->END_MAP() ||
1708: $curRes == $it->END_BRANCH() ) {
1709: $args->{'indentLevel'}--;
1710: }
1711: # Notice new branches
1712: if ($curRes == $it->BEGIN_BRANCH()) {
1713: $args->{'isNewBranch'} = 1;
1714: }
1715:
1716: # If this isn't an actual resource, continue on
1717: if (!ref($curRes)) {
1718: next;
1719: }
1720:
1721: # If this has been filtered out, continue on
1722: if (!(&$filterFunc($curRes))) {
1723: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1724: next;
1725: }
1726:
1727: # If this is an empty sequence and we're filtering them, continue on
1728: $args->{'mapHidden'} = 0;
1729: if (($curRes->is_map()) && (!$curRes->{DATA}->{HAS_VISIBLE_CHILDREN})) {
1730: if ($args->{'suppressEmptySequences'}) {
1731: next;
1732: } else {
1733: my $mapname = &Apache::lonnet::declutter($curRes->src());
1734: $mapname = &Apache::lonnet::deversion($mapname);
1735: if (lc($navmap->get_mapparam(undef,$mapname,"0.hiddenresource")) eq 'yes') {
1736: if ($userCanSeeHidden) {
1737: $args->{'mapHidden'} = 1;
1738: } else {
1739: next;
1740: }
1741: }
1742: }
1743: }
1744:
1745: # If we're suppressing navmaps and this is a navmap, continue on
1746: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1747: next;
1748: }
1749:
1750: $args->{'counter'}++;
1751:
1752: # Does it have multiple parts?
1753: $args->{'multipart'} = 0;
1754: $args->{'condensed'} = 0;
1755: my @parts;
1756:
1757: # Decide what parts to show.
1758: if ($curRes->is_problem() && $showParts) {
1759: @parts = @{$curRes->parts()};
1760: $args->{'multipart'} = $curRes->multipart();
1761:
1762: if ($condenseParts) { # do the condensation
1763: if (!$args->{'condensed'}) {
1764: # Decide whether to condense based on similarity
1765: my $status = $curRes->status($parts[0]);
1766: my $due = $curRes->duedate($parts[0]);
1767: my $open = $curRes->opendate($parts[0]);
1768: my $statusAllSame = 1;
1769: my $dueAllSame = 1;
1770: my $openAllSame = 1;
1771: for (my $i = 1; $i < scalar(@parts); $i++) {
1772: if ($curRes->status($parts[$i]) != $status){
1773: $statusAllSame = 0;
1774: }
1775: if ($curRes->duedate($parts[$i]) != $due ) {
1776: $dueAllSame = 0;
1777: }
1778: if ($curRes->opendate($parts[$i]) != $open) {
1779: $openAllSame = 0;
1780: }
1781: }
1782: # $*allSame is true if all the statuses were
1783: # the same. Now, if they are all the same and
1784: # match one of the statuses to condense, or they
1785: # are all open with the same due date, or they are
1786: # all OPEN_LATER with the same open date, display the
1787: # status of the first non-zero part (to get the 'correct'
1788: # status right, since 0 is never 'correct' or 'open').
1789: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1790: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1791: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1792: @parts = ($parts[0]);
1793: $args->{'condensed'} = 1;
1794: }
1795: }
1796: # Multipart problem with one part: always "condense" (happens
1797: # to match the desirable behavior)
1798: if ($curRes->countParts() == 1) {
1799: @parts = ($parts[0]);
1800: $args->{'condensed'} = 1;
1801: }
1802: }
1803: }
1804:
1805: # If the multipart problem was condensed, "forget" it was multipart
1806: if (scalar(@parts) == 1) {
1807: $args->{'multipart'} = 0;
1808: } else {
1809: # Add part 0 so we display it correctly.
1810: unshift @parts, '0';
1811: }
1812:
1813: {
1814: my ($src,$symb,$anchor,$stack);
1815: if ($args->{'sort'}) {
1816: my $it = $navmap->getIterator(undef, undef, undef, 1);
1817: while ( my $res=$it->next()) {
1818: if (ref($res) &&
1819: $res->symb() eq $curRes->symb()) { last; }
1820: }
1821: $stack=$it->getStack();
1822: } else {
1823: $stack=$it->getStack();
1824: }
1825: ($src,$symb,$anchor)=getLinkForResource($stack);
1826: my $srcHasQuestion = $src =~ /\?/;
1827: if (defined($anchor)) { $anchor='#'.$anchor; }
1828: if (($args->{'caller'} eq 'sequence') && ($curRes->is_map())) {
1829: $args->{"resourceLink"} = $src.($srcHasQuestion?'&':'?') .'navmap=1';
1830: } else {
1831: $args->{"resourceLink"} = $src.
1832: ($srcHasQuestion?'&':'?') .
1833: 'symb=' . &escape($symb).$anchor;
1834: }
1835: }
1836: # Now, we've decided what parts to show. Loop through them and
1837: # show them.
1838: foreach my $part (@parts) {
1839: $rownum ++;
1840:
1841: $result .= &Apache::loncommon::start_data_table_row();
1842:
1843: # Set up some data about the parts that the cols might want
1844: my $filter = $it->{FILTER};
1845:
1846: # Now, display each column.
1847: foreach my $col (@$cols) {
1848: my $colHTML = '';
1849: if (ref($col)) {
1850: $colHTML .= &$col($curRes, $part, $args);
1851: } else {
1852: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1853: }
1854:
1855: # If this is the first column and it's time to print
1856: # the anchor, do so
1857: if ($col == $cols->[0] &&
1858: $args->{'counter'} == $args->{'currentJumpIndex'} -
1859: $currentJumpDelta) {
1860: # Jam the anchor after the <td> tag;
1861: # necessary for valid HTML (which Mozilla requires)
1862: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1863: $displayedJumpMarker = 1;
1864: }
1865: $result .= $colHTML . "\n";
1866: }
1867: $result .= &Apache::loncommon::end_data_table_row();
1868: $args->{'isNewBranch'} = 0;
1869: }
1870:
1871: if ($r && $rownum % 20 == 0) {
1872: $r->print($result);
1873: $result = "";
1874: $r->rflush();
1875: }
1876: } continue {
1877: if ($r) {
1878: # If we have the connection, make sure the user is still connected
1879: my $c = $r->connection;
1880: if ($c->aborted()) {
1881: # Who cares what we do, nobody will see it anyhow.
1882: return '';
1883: }
1884: }
1885: }
1886:
1887: $result.=&Apache::loncommon::end_data_table();
1888:
1889: # Print out the part that jumps to #curloc if it exists
1890: # delay needed because the browser is processing the jump before
1891: # it finishes rendering, so it goes to the wrong place!
1892: # onload might be better, but this routine has no access to that.
1893: # On mozilla, the 0-millisecond timeout seems to prevent this;
1894: # it's quite likely this might fix other browsers, too, and
1895: # certainly won't hurt anything.
1896: if ($displayedJumpMarker) {
1897: $result .= &Apache::lonhtmlcommon::scripttag("
1898: if (location.href.indexOf('#curloc')==-1) {
1899: setTimeout(\"location += '#curloc';\", 0)
1900: }
1901: ");
1902: }
1903:
1904: if ($r) {
1905: $r->print($result);
1906: $result = "";
1907: $r->rflush();
1908: }
1909:
1910: return $result;
1911: }
1912:
1913: sub add_linkitem {
1914: my ($linkitems,$name,$cmd,$text)=@_;
1915: $$linkitems{$name}{'cmd'}=$cmd;
1916: $$linkitems{$name}{'text'}=&mt($text);
1917: }
1918:
1919: sub show_linkitems_toolbar {
1920: my ($args,$condition) = @_;
1921: my $result;
1922: if (ref($args) eq 'HASH') {
1923: if (ref($args->{'linkitems'}) eq 'HASH') {
1924: my $numlinks = scalar(keys(%{$args->{'linkitems'}}));
1925: if ($numlinks > 1) {
1926: $result = '<td>'.
1927: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',
1928: undef,'RAT').
1929: '</td>'.
1930: '<td> </td>'.
1931: '<td class="LC_middle">'.&mt('Tools:').'</td>';
1932: }
1933: $result .= '<td align="left">'."\n".
1934: '<ul id="LC_toolbar">';
1935: my @linkorder = ('firsthomework','everything','uncompleted',
1936: 'changefolder','clearbubbles','edittoplevel');
1937: foreach my $link (@linkorder) {
1938: if (ref($args->{'linkitems'}{$link}) eq 'HASH') {
1939: if ($args->{'linkitems'}{$link}{'text'} ne '') {
1940: $args->{'linkitems'}{$link}{'cmd'}=~s/"/'/g;
1941: if ($args->{'linkitems'}{$link}{'cmd'}) {
1942: my $link_id = 'LC_content_toolbar_'.$link;
1943: if ($link eq 'changefolder') {
1944: if ($condition) {
1945: $link_id='LC_content_toolbar_changefolder_toggled';
1946: } else {
1947: $link_id='LC_content_toolbar_changefolder';
1948: }
1949: }
1950: $result .= '<li><a href="#" '.
1951: 'onclick="'.$args->{'linkitems'}{$link}{'cmd'}.'" '.
1952: 'id="'.$link_id.'" '.
1953: 'class="LC_toolbarItem" '.
1954: 'title="'.$args->{'linkitems'}{$link}{'text'}.'">'.
1955: '</a></li>'."\n";
1956: }
1957: }
1958: }
1959: }
1960: $result .= '</ul>'.
1961: '</td>';
1962: if (($numlinks==1) && (exists($args->{'linkitems'}{'edittoplevel'}))) {
1963: $result .= '<td><a href="'.$args->{'linkitems'}{'edittoplevel'}{'cmd'}.'">'.
1964: &mt('Content Editor').'</a></td>';
1965: }
1966: }
1967: if ($args->{'sort_html'}) {
1968: $result .= '<td> </td><td> </td><td> </td>'.
1969: '<td align="right">'.$args->{'sort_html'}.'</td>';
1970: }
1971: }
1972: if ($result) {
1973: $result = "<table><tr>$result</tr></table>";
1974: }
1975: return $result;
1976: }
1977:
1978: 1;
1979:
1980:
1981:
1982:
1983:
1984:
1985:
1986:
1987:
1988: package Apache::lonnavmaps::navmap;
1989:
1990: =pod
1991:
1992: =head1 Object: Apache::lonnavmaps::navmap
1993:
1994: =head2 Overview
1995:
1996: The navmap object's job is to provide access to the resources
1997: in the course as Apache::lonnavmaps::resource objects, and to
1998: query and manage the relationship between those resource objects.
1999:
2000: Generally, you'll use the navmap object in one of three basic ways.
2001: In order of increasing complexity and power:
2002:
2003: =over 4
2004:
2005: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
2006: various ways to obtain resource objects, based on various identifiers.
2007: Use this when you want to request information about one object or
2008: a handful of resources you already know the identities of, from some
2009: other source. For more about Ids, Symbs, and MapPcs, see the
2010: Resource documentation. Note that Url should be a B<last resort>,
2011: not your first choice; it only really works when there is only one
2012: instance of the resource in the course, which only applies to
2013: maps, and even that may change in the future (see the B<getResourceByUrl>
2014: documentation for more details.)
2015:
2016: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
2017: retrieves resources matching some criterion and returns them
2018: in a flat array, with no structure information. Use this when
2019: you are manipulating a series of resources, based on what map
2020: the are in, but do not care about branching, or exactly how
2021: the maps and resources are related. This is the most common case.
2022:
2023: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2024: the course's navmap in various ways without writing the traversal
2025: code yourself. See iterator documentation below. Use this when
2026: you need to know absolutely everything about the course, including
2027: branches and the precise relationship between maps and resources.
2028:
2029: =back
2030:
2031: =head2 Creation And Destruction
2032:
2033: To create a navmap object, use the following function:
2034:
2035: =over 4
2036:
2037: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2038:
2039: Creates a new navmap object. Returns the navmap object if this is
2040: successful, or B<undef> if not.
2041:
2042: =back
2043:
2044: =head2 Methods
2045:
2046: =over 4
2047:
2048: =item * B<getIterator>(first, finish, filter, condition):
2049:
2050: See iterator documentation below.
2051:
2052: =cut
2053:
2054: use strict;
2055: use GDBM_File;
2056: use Apache::lonnet;
2057: use LONCAPA;
2058:
2059: sub new {
2060: # magic invocation to create a class instance
2061: my $proto = shift;
2062: my $class = ref($proto) || $proto;
2063: my $self = {};
2064: bless($self); # So we can call change_user if necessary
2065:
2066: $self->{USERNAME} = shift || $env{'user.name'};
2067: $self->{DOMAIN} = shift || $env{'user.domain'};
2068: $self->{CODE} = shift;
2069: $self->{NOHIDE} = shift;
2070:
2071:
2072:
2073: # Resource cache stores navmap resources as we reference them. We generate
2074: # them on-demand so we don't pay for creating resources unless we use them.
2075: $self->{RESOURCE_CACHE} = {};
2076:
2077: # Network failure flag, if we accessed the course or user opt and
2078: # failed
2079: $self->{NETWORK_FAILURE} = 0;
2080:
2081: # We can only tie the nav hash as done below if the username/domain
2082: # match the env one. Otherwise change_user does everything we need...since we can't
2083: # assume there are course hashes for the specific requested user:domain
2084: # Note: change_user is also called if we need the nav hash when printing CODEd
2085: # assignments or printing an exam, in which the enclosing folder for the items in
2086: # the exam has hidden set.
2087: #
2088:
2089: if (($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'}) &&
2090: !$self->{CODE} && !$self->{NOHIDE}) {
2091:
2092: # tie the nav hash
2093:
2094: my %navmaphash;
2095: my %parmhash;
2096: my $courseFn = $env{"request.course.fn"};
2097: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2098: &GDBM_READER(), 0640))) {
2099: return undef;
2100: }
2101:
2102: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2103: &GDBM_READER(), 0640)))
2104: {
2105: untie %{$self->{PARM_HASH}};
2106: return undef;
2107: }
2108:
2109: $self->{NAV_HASH} = \%navmaphash;
2110: $self->{PARM_HASH} = \%parmhash;
2111: $self->{PARM_CACHE} = {};
2112: } else {
2113: $self->change_user($self->{USERNAME}, $self->{DOMAIN}, $self->{CODE}, $self->{NOHIDE});
2114: }
2115:
2116: return $self;
2117: }
2118:
2119: #
2120: # In some instances it is useful to be able to dynamically change the
2121: # username/domain associated with a navmap (e.g. to navigate for someone
2122: # else besides the current user...if sufficiently privileged.
2123: # Parameters:
2124: # user - New user.
2125: # domain- Domain the user belongs to.
2126: # code - Anonymous CODE in use.
2127: # Implicit inputs:
2128: #
2129: sub change_user {
2130: my $self = shift;
2131: $self->{USERNAME} = shift;
2132: $self->{DOMAIN} = shift;
2133: $self->{CODE} = shift;
2134: $self->{NOHIDE} = shift;
2135:
2136: # If the hashes are already tied make sure to break that bond:
2137:
2138: untie %{$self->{NAV_HASH}};
2139: untie %{$self->{PARM_HASH}};
2140:
2141: # The assumption is that we have to
2142: # use lonmap here to re-read the hash and from it reconstruct
2143: # new big and parameter hashes. An implicit assumption at this time
2144: # is that the course file is probably not created locally yet
2145: # an that we will therefore just read without tying.
2146:
2147: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2148:
2149: my %big_hash;
2150: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, $self->{CODE}, $self->{NOHIDE}, \%big_hash);
2151: $self->{NAV_HASH} = \%big_hash;
2152:
2153:
2154:
2155: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2156: # param.xxxx keys.
2157:
2158: $self->{PARM_CACHE} = {};
2159:
2160: my %parm_hash = {};
2161: foreach my $key (keys(%big_hash)) {
2162: if ($key =~ /^param\./) {
2163: my $param_key = $key;
2164: $param_key =~ s/^param\.//;
2165: $parm_hash{$param_key} = $big_hash{$key};
2166: }
2167: }
2168:
2169: $self->{PARM_HASH} = \%parm_hash;
2170:
2171: }
2172:
2173: sub generate_course_user_opt {
2174: my $self = shift;
2175: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2176:
2177: my $uname=$self->{USERNAME};
2178: my $udom=$self->{DOMAIN};
2179:
2180: my $cid=$env{'request.course.id'};
2181: my $cdom=$env{'course.'.$cid.'.domain'};
2182: my $cnum=$env{'course.'.$cid.'.num'};
2183:
2184: # ------------------------------------------------- Get coursedata (if present)
2185: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2186: # Check for network failure
2187: if (!ref($courseopt)) {
2188: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2189: $self->{NETWORK_FAILURE} = 1;
2190: }
2191: undef($courseopt);
2192: }
2193:
2194: # --------------------------------------------------- Get userdata (if present)
2195:
2196: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2197: # Check for network failure
2198: if (!ref($useropt)) {
2199: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2200: $self->{NETWORK_FAILURE} = 1;
2201: }
2202: undef($useropt);
2203: }
2204:
2205: $self->{COURSE_OPT} = $courseopt;
2206: $self->{USER_OPT} = $useropt;
2207:
2208: $self->{COURSE_USER_OPT_GENERATED} = 1;
2209:
2210: return;
2211: }
2212:
2213:
2214:
2215: sub generate_email_discuss_status {
2216: my $self = shift;
2217: my $symb = shift;
2218: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2219:
2220: my $cid=$env{'request.course.id'};
2221: my $cdom=$env{'course.'.$cid.'.domain'};
2222: my $cnum=$env{'course.'.$cid.'.num'};
2223:
2224: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2225: my $logoutTime = $emailstatus{'logout'};
2226: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2227: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2228: $courseLeaveTime : $logoutTime);
2229: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2230: $cdom, $cnum);
2231: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2232: $self->{DOMAIN},$self->{USERNAME},'lastread');
2233: my %lastreadtime = ();
2234: foreach my $key (keys(%lastread)) {
2235: my $shortkey = $key;
2236: $shortkey =~ s/_lastread$//;
2237: $lastreadtime{$shortkey} = $lastread{$key};
2238: }
2239:
2240: my %feedback=();
2241: my %error=();
2242: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2243: $self->{USERNAME});
2244:
2245: foreach my $msgid (@keys) {
2246: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2247: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2248: $symb,$error) = &Apache::lonmsg::unpackmsgid(&LONCAPA::escape($msgid));
2249: &Apache::lonenc::check_decrypt(\$symb);
2250: if (($fromcid ne '') && ($fromcid ne $cid)) {
2251: next;
2252: }
2253: if (defined($symb)) {
2254: if (defined($error) && $error == 1) {
2255: $error{$symb}.=','.$msgid;
2256: } else {
2257: $feedback{$symb}.=','.$msgid;
2258: }
2259: } else {
2260: my $plain=
2261: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2262: if ($plain=~/ \[([^\]]+)\]\:/) {
2263: my $url=$1;
2264: if ($plain=~/\:Error \[/) {
2265: $error{$url}.=','.$msgid;
2266: } else {
2267: $feedback{$url}.=','.$msgid;
2268: }
2269: }
2270: }
2271: }
2272: }
2273:
2274: #symbs of resources that have feedbacks (will be urls pre-2.3)
2275: $self->{FEEDBACK} = \%feedback;
2276: #or errors (will be urls pre 2.3)
2277: $self->{ERROR_MSG} = \%error;
2278: $self->{DISCUSSION_TIME} = \%discussiontime;
2279: $self->{EMAIL_STATUS} = \%emailstatus;
2280: $self->{LAST_READ} = \%lastreadtime;
2281:
2282: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2283: }
2284:
2285: sub get_user_data {
2286: my $self = shift;
2287: if ($self->{RETRIEVED_USER_DATA}) { return; }
2288:
2289: # Retrieve performance data on problems
2290: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2291: $self->{DOMAIN},
2292: $self->{USERNAME});
2293: $self->{STUDENT_DATA} = \%student_data;
2294:
2295: $self->{RETRIEVED_USER_DATA} = 1;
2296: }
2297:
2298: sub get_discussion_data {
2299: my $self = shift;
2300: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2301: return $self->{DISCUSSION_DATA};
2302: }
2303:
2304: $self->generate_email_discuss_status();
2305:
2306: my $cid=$env{'request.course.id'};
2307: my $cdom=$env{'course.'.$cid.'.domain'};
2308: my $cnum=$env{'course.'.$cid.'.num'};
2309: # Retrieve discussion data for resources in course
2310: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2311:
2312:
2313: $self->{DISCUSSION_DATA} = \%discussion_data;
2314: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2315: return $self->{DISCUSSION_DATA};
2316: }
2317:
2318:
2319: # Internal function: Takes a key to look up in the nav hash and implements internal
2320: # memory caching of that key.
2321: sub navhash {
2322: my $self = shift; my $key = shift;
2323: return $self->{NAV_HASH}->{$key};
2324: }
2325:
2326: =pod
2327:
2328: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2329: false otherwise. Undefined course maps indicate an error somewhere in
2330: LON-CAPA, and you will not be able to proceed with using the navmap.
2331: See the B<NAV> screen for an example of using this.
2332:
2333: =cut
2334:
2335: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2336: sub courseMapDefined {
2337: my $self = shift;
2338: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2339:
2340: my $firstres = $self->navhash("map_start_$uri");
2341: my $lastres = $self->navhash("map_finish_$uri");
2342: return $firstres && $lastres;
2343: }
2344:
2345: sub getIterator {
2346: my $self = shift;
2347: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2348: shift, undef, shift,
2349: shift, shift);
2350: return $iterator;
2351: }
2352:
2353: # Private method: Does the given resource (as a symb string) have
2354: # current discussion? Returns 0 if chat/mail data not extracted.
2355: sub hasDiscussion {
2356: my $self = shift;
2357: my $symb = shift;
2358: $self->generate_email_discuss_status();
2359:
2360: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2361:
2362: #return defined($self->{DISCUSSION_TIME}->{$symb});
2363:
2364: # backward compatibility (bulletin boards used to be 'wrapped')
2365: my $ressymb = $self->wrap_symb($symb);
2366: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2367: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2368: } else {
2369: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2370: 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).
2371: }
2372: }
2373:
2374: sub last_post_time {
2375: my $self = shift;
2376: my $symb = shift;
2377: my $ressymb = $self->wrap_symb($symb);
2378: return $self->{DISCUSSION_TIME}->{$ressymb};
2379: }
2380:
2381: sub discussion_info {
2382: my $self = shift;
2383: my $symb = shift;
2384: my $filter = shift;
2385:
2386: $self->get_discussion_data();
2387:
2388: my $ressymb = $self->wrap_symb($symb);
2389: # keys used to store bulletinboard postings use 'unwrapped' symb.
2390: my $discsymb = &escape($self->unwrap_symb($ressymb));
2391: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2392: if (!$version) { return; }
2393:
2394: my $prevread = $self->{LAST_READ}{$ressymb};
2395:
2396: my $count = 0;
2397: my $hiddenflag = 0;
2398: my $deletedflag = 0;
2399: my ($hidden,$deleted,%info);
2400:
2401: for (my $id=$version; $id>0; $id--) {
2402: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2403: my @keys=split(/:/,$vkeys);
2404: if (grep(/^hidden$/ ,@keys)) {
2405: if (!$hiddenflag) {
2406: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2407: $hiddenflag = 1;
2408: }
2409: } elsif (grep(/^deleted$/,@keys)) {
2410: if (!$deletedflag) {
2411: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2412: $deletedflag = 1;
2413: }
2414: } else {
2415: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2416: if ($filter eq 'unread') {
2417: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2418: next;
2419: }
2420: }
2421: $count++;
2422: $info{$count}{'subject'} =
2423: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2424: $info{$count}{'id'} = $id;
2425: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2426: }
2427: }
2428: }
2429: if (wantarray) {
2430: return ($count,%info);
2431: }
2432: return $count;
2433: }
2434:
2435: sub wrap_symb {
2436: my $self = shift;
2437: my $symb = shift;
2438: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2439: unless ($symb =~ m|adm/wrapper/adm|) {
2440: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2441: }
2442: }
2443: return $symb;
2444: }
2445:
2446: sub unwrap_symb {
2447: my $self = shift;
2448: my $ressymb = shift;
2449: my $discsymb = $ressymb;
2450: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2451: $discsymb = $1.$2;
2452: }
2453: return $discsymb;
2454: }
2455:
2456: # Private method: Does the given resource (as a symb string) have
2457: # current feedback? Returns the string in the feedback hash, which
2458: # will be false if it does not exist.
2459:
2460: sub getFeedback {
2461: my $self = shift;
2462: my $symb = shift;
2463: my $source = shift;
2464:
2465: $self->generate_email_discuss_status();
2466:
2467: if (!defined($self->{FEEDBACK})) { return ""; }
2468:
2469: my $feedback;
2470: if ($self->{FEEDBACK}->{$symb}) {
2471: $feedback = $self->{FEEDBACK}->{$symb};
2472: if ($self->{FEEDBACK}->{$source}) {
2473: $feedback .= ','.$self->{FEEDBACK}->{$source};
2474: }
2475: } else {
2476: if ($self->{FEEDBACK}->{$source}) {
2477: $feedback = $self->{FEEDBACK}->{$source};
2478: }
2479: }
2480: return $feedback;
2481: }
2482:
2483: # Private method: Get the errors for that resource (by source).
2484: sub getErrors {
2485: my $self = shift;
2486: my $symb = shift;
2487: my $src = shift;
2488:
2489: $self->generate_email_discuss_status();
2490:
2491: if (!defined($self->{ERROR_MSG})) { return ""; }
2492:
2493: my $errors;
2494: if ($self->{ERROR_MSG}->{$symb}) {
2495: $errors = $self->{ERROR_MSG}->{$symb};
2496: if ($self->{ERROR_MSG}->{$src}) {
2497: $errors .= ','.$self->{ERROR_MSG}->{$src};
2498: }
2499: } else {
2500: if ($self->{ERROR_MSG}->{$src}) {
2501: $errors = $self->{ERROR_MSG}->{$src};
2502: }
2503: }
2504: return $errors;
2505: }
2506:
2507: =pod
2508:
2509: =item * B<getById>(id):
2510:
2511: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2512: object for that resource. This method, or other methods that use it
2513: (as in the resource object) is the only proper way to obtain a
2514: resource object.
2515:
2516: =item * B<getBySymb>(symb):
2517:
2518: Based on the symb of the resource, get a resource object for that
2519: resource. This is one of the proper ways to get a resource object.
2520:
2521: =item * B<getByMapPc>(map_pc):
2522:
2523: Based on the map_pc of the resource, get a resource object for
2524: the given map. This is one of the proper ways to get a resource object.
2525:
2526: =cut
2527:
2528: # The strategy here is to cache the resource objects, and only construct them
2529: # as we use them. The real point is to prevent reading any more from the tied
2530: # hash than we have to, which should hopefully alleviate speed problems.
2531:
2532: sub getById {
2533: my $self = shift;
2534: my $id = shift;
2535:
2536: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2537: {
2538: return $self->{RESOURCE_CACHE}->{$id};
2539: }
2540:
2541: # resource handles inserting itself into cache.
2542: # Not clear why the quotes are necessary, but as of this
2543: # writing it doesn't work without them.
2544: return "Apache::lonnavmaps::resource"->new($self, $id);
2545: }
2546:
2547: sub getBySymb {
2548: my $self = shift;
2549: my $symb = shift;
2550:
2551: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2552: my $map = $self->getResourceByUrl($mapUrl);
2553: my $returnvalue = undef;
2554: if (ref($map)) {
2555: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2556: }
2557: return $returnvalue;
2558: }
2559:
2560: sub getByMapPc {
2561: my $self = shift;
2562: my $map_pc = shift;
2563: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2564: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2565: return $self->getById($map_id);
2566: }
2567:
2568: =pod
2569:
2570: =item * B<firstResource>():
2571:
2572: Returns a resource object reference corresponding to the first
2573: resource in the navmap.
2574:
2575: =cut
2576:
2577: sub firstResource {
2578: my $self = shift;
2579: my $firstResource = $self->navhash('map_start_' .
2580: &Apache::lonnet::clutter($env{'request.course.uri'}));
2581: return $self->getById($firstResource);
2582: }
2583:
2584: =pod
2585:
2586: =item * B<finishResource>():
2587:
2588: Returns a resource object reference corresponding to the last resource
2589: in the navmap.
2590:
2591: =cut
2592:
2593: sub finishResource {
2594: my $self = shift;
2595: my $firstResource = $self->navhash('map_finish_' .
2596: &Apache::lonnet::clutter($env{'request.course.uri'}));
2597: return $self->getById($firstResource);
2598: }
2599:
2600: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2601: # the actual lookup; parmval caches the results.
2602: sub parmval {
2603: my $self = shift;
2604: my ($what,$symb,$recurse)=@_;
2605: my $hashkey = $what."|||".$symb;
2606: my $cache = $self->{PARM_CACHE};
2607: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2608: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2609: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2610: if (wantarray) {
2611: return @{$self->{PARM_CACHE}->{$hashkey}};
2612: } else {
2613: return $self->{PARM_CACHE}->{$hashkey}->[0];
2614: }
2615: }
2616: } else {
2617: return $self->{PARM_CACHE}->{$hashkey};
2618: }
2619: }
2620: my $result = $self->parmval_real($what, $symb, $recurse);
2621: $self->{PARM_CACHE}->{$hashkey} = $result;
2622: if (wantarray) {
2623: return @{$result};
2624: }
2625: return $result->[0];
2626: }
2627:
2628:
2629: sub parmval_real {
2630: my $self = shift;
2631: my ($what,$symb,$recurse) = @_;
2632:
2633:
2634: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2635: $self->generate_course_user_opt();
2636:
2637: my $cid=$env{'request.course.id'};
2638: my $csec=$env{'request.course.sec'};
2639: my $cgroup='';
2640: my @cgrps=split(/:/,$env{'request.course.groups'});
2641: if (@cgrps > 0) {
2642: @cgrps = sort(@cgrps);
2643: $cgroup = $cgrps[0];
2644: }
2645: my $uname=$self->{USERNAME};
2646: my $udom=$self->{DOMAIN};
2647:
2648: unless ($symb) { return ['']; }
2649: my $result='';
2650:
2651: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2652: $mapname = &Apache::lonnet::deversion($mapname);
2653: # ----------------------------------------------------- Cascading lookup scheme
2654: my $rwhat=$what;
2655: $what=~s/^parameter\_//;
2656: $what=~s/\_/\./;
2657:
2658: my $symbparm=$symb.'.'.$what;
2659: my $mapparm=$mapname.'___(all).'.$what;
2660: my $usercourseprefix=$cid;
2661:
2662:
2663:
2664: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2665: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2666: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2667:
2668:
2669: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2670: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2671: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2672:
2673:
2674: my $courselevel= $usercourseprefix.'.'.$what;
2675: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2676: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2677:
2678:
2679: my $useropt = $self->{USER_OPT};
2680: my $courseopt = $self->{COURSE_OPT};
2681: my $parmhash = $self->{PARM_HASH};
2682:
2683: # ---------------------------------------------------------- first, check user
2684: if ($uname and defined($useropt)) {
2685: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2686: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2687: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2688: }
2689:
2690: # ------------------------------------------------------- second, check course
2691: if ($cgroup ne '' and defined($courseopt)) {
2692: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2693: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2694: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2695: }
2696:
2697: if ($csec and defined($courseopt)) {
2698: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2699: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2700: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2701: }
2702:
2703: if (defined($courseopt)) {
2704: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2705: }
2706:
2707: # ----------------------------------------------------- third, check map parms
2708:
2709: my $thisparm=$$parmhash{$symbparm};
2710: if (defined($thisparm)) { return [$thisparm,'map']; }
2711:
2712: # ----------------------------------------------------- fourth , check default
2713:
2714: my $meta_rwhat=$rwhat;
2715: $meta_rwhat=~s/\./_/g;
2716: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2717: if (defined($default)) { return [$default,'resource']}
2718: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2719: if (defined($default)) { return [$default,'resource']}
2720: # --------------------------------------------------- fifth, check more course
2721: if (defined($courseopt)) {
2722: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2723: if (defined($$courseopt{$courselevel})) {
2724: my $ret = [$$courseopt{$courselevel},'course'];
2725: return $ret;
2726: }
2727: }
2728: # --------------------------------------------------- sixth , cascade up parts
2729:
2730: my ($space,@qualifier)=split(/\./,$rwhat);
2731: my $qualifier=join('.',@qualifier);
2732: unless ($space eq '0') {
2733: my @parts=split(/_/,$space);
2734: my $id=pop(@parts);
2735: my $part=join('_',@parts);
2736: if ($part eq '') { $part='0'; }
2737: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2738: if (defined($partgeneral[0])) { return \@partgeneral; }
2739: }
2740: if ($recurse) { return []; }
2741: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2742: if (defined($pack_def)) { return [$pack_def,'resource']; }
2743: return [''];
2744: }
2745:
2746: sub recurseup_maps {
2747: my ($self,$mapname) = @_;
2748: my @recurseup;
2749: if ($mapname) {
2750: my $res = $self->getResourceByUrl($mapname);
2751: if (ref($res)) {
2752: my @pcs = split(/,/,$res->map_hierarchy());
2753: shift(@pcs);
2754: if (@pcs) {
2755: @recurseup = map { &Apache::lonnet::declutter($self->getByMapPc($_)->src()); } reverse(@pcs);
2756: }
2757: }
2758: }
2759: return @recurseup;
2760: }
2761:
2762: sub recursed_crumbs {
2763: my ($self,$mapurl,$restitle) = @_;
2764: my (@revmapinfo,@revmapres);
2765: my $mapres = $self->getResourceByUrl($mapurl);
2766: if (ref($mapres)) {
2767: @revmapres = map { $self->getByMapPc($_); } split(/,/,$mapres->map_breadcrumbs());
2768: shift(@revmapres);
2769: }
2770: my $allowedlength = 60;
2771: my $minlength = 5;
2772: my $allowedtitle = 30;
2773: if (($env{'environment.icons'} eq 'iconsonly') && (!$env{'browser.mobile'})) {
2774: $allowedlength = 100;
2775: $allowedtitle = 70;
2776: }
2777: if (length($restitle) > $allowedtitle) {
2778: $restitle = &truncate_crumb_text($restitle,$allowedtitle);
2779: }
2780: my $totallength = length($restitle);
2781: my @links;
2782:
2783: foreach my $map (@revmapres) {
2784: my $pc = $map->map_pc();
2785: next if ((!$pc) || ($pc == 1));
2786: push(@links,$map);
2787: push(@revmapinfo,{'href' => $map->link().'?navmap=1','text' => $map->title(),'no_mt' => 1,});
2788: $totallength += length($map->title());
2789: }
2790: my $numlinks = scalar(@links);
2791: if ($numlinks) {
2792: if ($totallength - $allowedlength > 0) {
2793: my $available = $allowedlength - length($restitle);
2794: my $avg = POSIX::ceil($available/$numlinks);
2795: if ($avg < $minlength) {
2796: $avg = $minlength;
2797: }
2798: @revmapinfo = ();
2799: foreach my $map (@links) {
2800: my $showntitle = &truncate_crumb_text($map->title(),$avg);
2801: if ($showntitle ne '') {
2802: push(@revmapinfo,{'href' => $map->link().'?navmap=1','text' => $showntitle,'no_mt' => 1,});
2803: }
2804: }
2805: }
2806: }
2807: if ($restitle ne '') {
2808: push(@revmapinfo,{'text' => $restitle, 'no_mt' => 1});
2809: }
2810: return @revmapinfo;
2811: }
2812:
2813: sub truncate_crumb_text {
2814: my ($title,$limit) = @_;
2815: my $showntitle = '';
2816: if (length($title) > $limit) {
2817: my @words = split(/\b\s*/,$title);
2818: if (@words == 1) {
2819: $showntitle = substr($title,0,$limit).' ...';
2820: } else {
2821: my $linklength = 0;
2822: my $num = 0;
2823: foreach my $word (@words) {
2824: $linklength += 1+length($word);
2825: if ($word eq '-') {
2826: $showntitle =~ s/ $//;
2827: $showntitle .= $word;
2828: } elsif ($linklength > $limit) {
2829: if ($num < @words) {
2830: $showntitle .= $word.' ...';
2831: last;
2832: } else {
2833: $showntitle .= $word;
2834: }
2835: } else {
2836: $showntitle .= $word.' ';
2837: }
2838: }
2839: $showntitle =~ s/ $//;
2840: }
2841: return $showntitle;
2842: } else {
2843: return $title;
2844: }
2845: }
2846:
2847: #
2848: # Determines the open/close dates for printing a map that
2849: # encloses a resource.
2850: #
2851: sub map_printdates {
2852: my ($self, $res, $part) = @_;
2853:
2854:
2855:
2856:
2857:
2858: my $opendate = $self->get_mapparam($res->symb(),'',"$part.printstartdate");
2859: my $closedate= $self->get_mapparam($res->symb(),'', "$part.printenddate");
2860:
2861:
2862: return ($opendate, $closedate);
2863: }
2864:
2865: sub get_mapparam {
2866: my ($self, $symb, $mapname, $what) = @_;
2867:
2868: # Ensure the course option hash is populated:
2869:
2870: $self->generate_course_user_opt();
2871:
2872: # Get the course id and section if there is one.
2873:
2874: my $cid=$env{'request.course.id'};
2875: my $csec=$env{'request.course.sec'};
2876: my $cgroup='';
2877: my @cgrps=split(/:/,$env{'request.course.groups'});
2878: if (@cgrps > 0) {
2879: @cgrps = sort(@cgrps);
2880: $cgroup = $cgrps[0];
2881: }
2882: my $uname=$self->{USERNAME};
2883: my $udom=$self->{DOMAIN};
2884:
2885: unless ($symb || $mapname) { return; }
2886: my $result='';
2887: my ($recursed,@recurseup);
2888:
2889: # Figure out which map we are in.
2890:
2891: if ($symb && !$mapname) {
2892: my ($id,$fn);
2893: ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2894: $mapname = &Apache::lonnet::deversion($mapname);
2895: }
2896:
2897: my $rwhat=$what;
2898: $what=~s/^parameter\_//;
2899: $what=~s/\_/\./;
2900:
2901: # Build the hash keys for the lookup:
2902:
2903: my $symbparm=$symb.'.'.$what;
2904: my $mapparm=$mapname.'___(all).'.$what;
2905: my $usercourseprefix=$cid;
2906:
2907:
2908: my $grplevel = "$usercourseprefix.[$cgroup].$mapparm";
2909: my $seclevel = "$usercourseprefix.[$csec].$mapparm";
2910: my $courselevel = "$usercourseprefix.$mapparm";
2911:
2912:
2913: # Get handy references to the hashes we need in $self:
2914:
2915: my $useropt = $self->{USER_OPT};
2916: my $courseopt = $self->{COURSE_OPT};
2917: my $parmhash = $self->{PARM_HASH};
2918:
2919: # Check per user
2920:
2921:
2922:
2923: if ($uname and defined($useropt)) {
2924: if (defined($$useropt{$courselevel})) {
2925: return $$useropt{$courselevel};
2926: }
2927: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2928: unless ($recursed) {
2929: @recurseup = $self->recurseup_maps($mapname);
2930: $recursed = 1;
2931: }
2932: foreach my $item (@recurseup) {
2933: my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
2934: if (defined($$useropt{$norecursechk})) {
2935: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2936: return $$useropt{$norecursechk};
2937: }
2938: }
2939: }
2940: }
2941: }
2942:
2943: # Check course -- group
2944:
2945:
2946:
2947: if ($cgroup ne '' and defined ($courseopt)) {
2948: if (defined($$courseopt{$grplevel})) {
2949: return $$courseopt{$grplevel};
2950: }
2951: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2952: unless ($recursed) {
2953: @recurseup = $self->recurseup_maps($mapname);
2954: $recursed = 1;
2955: }
2956: foreach my $item (@recurseup) {
2957: my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
2958: if (defined($$courseopt{$norecursechk})) {
2959: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2960: return $$courseopt{$norecursechk};
2961: }
2962: }
2963: }
2964: }
2965: }
2966:
2967: # Check course -- section
2968:
2969:
2970:
2971:
2972:
2973: if ($csec and defined($courseopt)) {
2974: if (defined($$courseopt{$seclevel})) {
2975: return $$courseopt{$seclevel};
2976: }
2977: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2978: unless ($recursed) {
2979: @recurseup = $self->recurseup_maps($mapname);
2980: $recursed = 1;
2981: }
2982: foreach my $item (@recurseup) {
2983: my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
2984: if (defined($$courseopt{$norecursechk})) {
2985: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
2986: return $$courseopt{$norecursechk};
2987: }
2988: }
2989: }
2990: }
2991: }
2992: # Check the map parameters themselves:
2993:
2994: if ($symb) {
2995: my $symbparm=$symb.'.'.$what;
2996: my $thisparm = $$parmhash{$symbparm};
2997: if (defined($thisparm)) {
2998: return $thisparm;
2999: }
3000: }
3001:
3002:
3003: # Additional course parameters:
3004:
3005: if (defined($courseopt)) {
3006: if (defined($$courseopt{$courselevel})) {
3007: return $$courseopt{$courselevel};
3008: }
3009: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
3010: unless ($recursed) {
3011: @recurseup = $self->recurseup_maps($mapname);
3012: $recursed = 1;
3013: }
3014: foreach my $item (@recurseup) {
3015: my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
3016: if (defined($$courseopt{$norecursechk})) {
3017: if ($what =~ /\.(encrypturl|hiddenresource)$/) {
3018: return $$courseopt{$norecursechk};
3019: }
3020: }
3021: }
3022: }
3023: }
3024: return undef; # Unefined if we got here.
3025: }
3026:
3027: sub course_printdates {
3028: my ($self, $symb, $part) = @_;
3029:
3030:
3031: my $opendate = $self->getcourseparam($symb, $part . '.printstartdate');
3032: my $closedate = $self->getcourseparam($symb, $part . '.printenddate');
3033: return ($opendate, $closedate);
3034:
3035: }
3036:
3037: sub getcourseparam {
3038: my ($self, $symb, $what) = @_;
3039:
3040: $self->generate_course_user_opt(); # If necessary populate the hashes.
3041:
3042: my $uname = $self->{USERNAME};
3043: my $udom = $self->{DOMAIN};
3044:
3045: # Course, section, group ids come from the env:
3046:
3047: my $cid = $env{'request.course.id'};
3048: my $csec = $env{'request.course.sec'};
3049: my $cgroup = ''; # Assume no group
3050:
3051: my @cgroups = split(/:/, $env{'request.course.groups'});
3052: if(@cgroups > 0) {
3053: @cgroups = sort(@cgroups);
3054: $cgroup = $cgroups[0]; # There is a course group.
3055: }
3056: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
3057: $mapname = &Apache::lonnet::deversion($mapname);
3058:
3059: #
3060: # Make the various lookup keys:
3061: #
3062:
3063: $what=~s/^parameter\_//;
3064: $what=~s/\_/\./;
3065:
3066:
3067: my $symbparm = $symb . '.' . $what;
3068: my $mapparm=$mapname.'___(all).'.$what;
3069:
3070: # Local refs to the hashes we're going to look at:
3071:
3072: my $useropt = $self->{USER_OPT};
3073: my $courseopt = $self->{COURSE_OPT};
3074:
3075: #
3076: # We want the course level stuff from the way
3077: # parmval_real operates
3078: # TODO: Factor some of this stuff out of
3079: # both parmval_real and here
3080: #
3081: my $courselevel = $cid . '.' . $what;
3082: my $grplevel = $cid . '.[' . $cgroup . ']' . $what;
3083: my $seclevel = $cid . '.[' . $csec . ']' . $what;
3084:
3085:
3086: # Try for the user's course level option:
3087:
3088: if ($uname and defined($useropt)) {
3089: if (defined($$useropt{$courselevel})) {
3090: return $$useropt{$courselevel};
3091: }
3092: }
3093: # Try for the group's course level option:
3094:
3095: if ($cgroup ne '' and defined($courseopt)) {
3096: if (defined($$courseopt{$grplevel})) {
3097: return $$courseopt{$grplevel};
3098: }
3099: }
3100:
3101: # Try for section level parameters:
3102:
3103: if ($csec ne '' and defined($courseopt)) {
3104: if (defined($$courseopt{$seclevel})) {
3105: return $$courseopt{$seclevel};
3106: }
3107: }
3108: # Try for 'additional' course parameters:
3109:
3110: if (defined($courseopt)) {
3111: if (defined($$courseopt{$courselevel})) {
3112: return $$courseopt{$courselevel};
3113: }
3114: }
3115: return undef;
3116:
3117: }
3118:
3119:
3120: =pod
3121:
3122: =item * B<getResourceByUrl>(url,multiple):
3123:
3124: Retrieves a resource object by URL of the resource, unless the optional
3125: multiple parameter is included in which case an array of resource
3126: objects is returned. If passed a resource object, it will simply return
3127: it, so it is safe to use this method in code like
3128: "$res = $navmap->getResourceByUrl($res)"
3129: if you're not sure if $res is already an object, or just a URL. If the
3130: resource appears multiple times in the course, only the first instance
3131: will be returned (useful for maps), unless the multiple parameter has
3132: been included, in which case all instances are returned in an array.
3133:
3134: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall, noblockcheck):
3135:
3136: The map is a specification of a map to retreive the resources from,
3137: either as a url or as an object. The filterFunc is a reference to a
3138: function that takes a resource object as its one argument and returns
3139: true if the resource should be included, or false if it should not
3140: be. If recursive is true, the map will be recursively examined,
3141: otherwise it will not be. If bailout is true, the function will return
3142: as soon as it finds a resource, if false it will finish. If showall is
3143: true it will not hide maps that contain nothing but one other map. The
3144: noblockcheck arg is propagated to become the sixth arg in the call to
3145: lonnet::allowed when checking a resource's availability during collection
3146: of resources using the iterator. noblockcheck needs to be true if
3147: retrieveResources() was called by a routine that itself was called by
3148: lonnet::allowed, in order to avoid recursion. By default the map
3149: is the top-level map of the course, filterFunc is a function that
3150: always returns 1, recursive is true, bailout is false, showall is
3151: false. The resources will be returned in a list containing the
3152: resource objects for the corresponding resources, with B<no structure
3153: information> in the list; regardless of branching, recursion, etc.,
3154: it will be a flat list.
3155:
3156: Thus, this is suitable for cases where you don't want the structure,
3157: just a list of all resources. It is also suitable for finding out how
3158: many resources match a given description; for this use, if all you
3159: want to know is if I<any> resources match the description, the bailout
3160: parameter will allow you to avoid potentially expensive enumeration of
3161: all matching resources.
3162:
3163: =item * B<hasResource>(map, filterFunc, recursive, showall):
3164:
3165: Convenience method for
3166:
3167: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
3168:
3169: which will tell whether the map has resources matching the description
3170: in the filter function.
3171:
3172: =item * B<usedVersion>(url):
3173:
3174: Retrieves version infomation for a url. Returns the version (a number, or
3175: the string "mostrecent") for resources which have version information in
3176: the big hash.
3177:
3178: =cut
3179:
3180:
3181: sub getResourceByUrl {
3182: my $self = shift;
3183: my $resUrl = shift;
3184: my $multiple = shift;
3185:
3186: if (ref($resUrl)) { return $resUrl; }
3187:
3188: $resUrl = &Apache::lonnet::clutter($resUrl);
3189: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
3190: if (!$resId) { return ''; }
3191: if ($multiple) {
3192: my @resources = ();
3193: my @resIds = split (/,/, $resId);
3194: foreach my $id (@resIds) {
3195: my $resourceId = $self->getById($id);
3196: if ($resourceId) {
3197: push(@resources,$resourceId);
3198: }
3199: }
3200: return @resources;
3201: } else {
3202: if ($resId =~ /,/) {
3203: $resId = (split (/,/, $resId))[0];
3204: }
3205: return $self->getById($resId);
3206: }
3207: }
3208:
3209: sub retrieveResources {
3210: my $self = shift;
3211: my $map = shift;
3212: my $filterFunc = shift;
3213: if (!defined ($filterFunc)) {
3214: $filterFunc = sub {return 1;};
3215: }
3216: my $recursive = shift;
3217: if (!defined($recursive)) { $recursive = 1; }
3218: my $bailout = shift;
3219: if (!defined($bailout)) { $bailout = 0; }
3220: my $showall = shift;
3221: my $noblockcheck = shift;
3222: # Create the necessary iterator.
3223: if (!ref($map)) { # assume it's a url of a map.
3224: $map = $self->getResourceByUrl($map);
3225: }
3226:
3227: # If nothing was passed, assume top-level map
3228: if (!$map) {
3229: $map = $self->getById('0.0');
3230: }
3231:
3232: # Check the map's validity.
3233: if (!$map->is_map()) {
3234: # Oh, to throw an exception.... how I'd love that!
3235: return ();
3236: }
3237:
3238: # Get an iterator.
3239: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
3240: undef, $recursive, $showall);
3241:
3242: my @resources = ();
3243:
3244: if (&$filterFunc($map)) {
3245: push(@resources, $map);
3246: }
3247:
3248: # Run down the iterator and collect the resources.
3249: my $curRes;
3250:
3251: while ($curRes = $it->next(undef,$noblockcheck)) {
3252: if (ref($curRes)) {
3253: if (!&$filterFunc($curRes)) {
3254: next;
3255: }
3256:
3257: push(@resources, $curRes);
3258:
3259: if ($bailout) {
3260: return @resources;
3261: }
3262: }
3263:
3264: }
3265:
3266: return @resources;
3267: }
3268:
3269: sub hasResource {
3270: my $self = shift;
3271: my $map = shift;
3272: my $filterFunc = shift;
3273: my $recursive = shift;
3274: my $showall = shift;
3275:
3276: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
3277: }
3278:
3279: sub usedVersion {
3280: my $self = shift;
3281: my $linkurl = shift;
3282: return $self->navhash("version_$linkurl");
3283: }
3284:
3285: 1;
3286:
3287: package Apache::lonnavmaps::iterator;
3288: use Scalar::Util qw(weaken);
3289: use Apache::lonnet;
3290:
3291: =pod
3292:
3293: =back
3294:
3295: =head1 Object: navmap Iterator
3296:
3297: An I<iterator> encapsulates the logic required to traverse a data
3298: structure. navmap uses an iterator to traverse the course map
3299: according to the criteria you wish to use.
3300:
3301: To obtain an iterator, call the B<getIterator>() function of a
3302: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
3303: directly.) This will return a reference to the iterator:
3304:
3305: C<my $resourceIterator = $navmap-E<gt>getIterator();>
3306:
3307: To get the next thing from the iterator, call B<next>:
3308:
3309: C<my $nextThing = $resourceIterator-E<gt>next()>
3310:
3311: getIterator behaves as follows:
3312:
3313: =over 4
3314:
3315: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
3316:
3317: All parameters are optional. firstResource is a resource reference
3318: corresponding to where the iterator should start. It defaults to
3319: navmap->firstResource() for the corresponding nav map. finishResource
3320: corresponds to where you want the iterator to end, defaulting to
3321: navmap->finishResource(). filterHash is a hash used as a set
3322: containing strings representing the resource IDs, defaulting to
3323: empty. Condition is a 1 or 0 that sets what to do with the filter
3324: hash: If a 0, then only resources that exist IN the filterHash will be
3325: recursed on. If it is a 1, only resources NOT in the filterHash will
3326: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
3327: false (default), the iterator will only return the first level of map
3328: that is not just a single, 'redirecting' map. If true, the iterator
3329: will return all information, starting with the top-level map,
3330: regardless of content. returnTopMap, if true (default false), will
3331: cause the iterator to return the top-level map object (resource 0.0)
3332: before anything else.
3333:
3334: Thus, by default, only top-level resources will be shown. Change the
3335: condition to a 1 without changing the hash, and all resources will be
3336: shown. Changing the condition to 1 and including some values in the
3337: hash will allow you to selectively suppress parts of the navmap, while
3338: leaving it on 0 and adding things to the hash will allow you to
3339: selectively add parts of the nav map. See the handler code for
3340: examples.
3341:
3342: The iterator will return either a reference to a resource object, or a
3343: token representing something in the map, such as the beginning of a
3344: new branch. The possible tokens are:
3345:
3346: =over 4
3347:
3348: =item * B<END_ITERATOR>:
3349:
3350: The iterator has returned all that it's going to. Further calls to the
3351: iterator will just produce more of these. This is a "false" value, and
3352: is the only false value the iterator which will be returned, so it can
3353: be used as a loop sentinel.
3354:
3355: =item * B<BEGIN_MAP>:
3356:
3357: A new map is being recursed into. This is returned I<after> the map
3358: resource itself is returned.
3359:
3360: =item * B<END_MAP>:
3361:
3362: The map is now done.
3363:
3364: =item * B<BEGIN_BRANCH>:
3365:
3366: A branch is now starting. The next resource returned will be the first
3367: in that branch.
3368:
3369: =item * B<END_BRANCH>:
3370:
3371: The branch is now done.
3372:
3373: =back
3374:
3375: The tokens are retreivable via methods on the iterator object, i.e.,
3376: $iterator->END_MAP.
3377:
3378: Maps can contain empty resources. The iterator will automatically skip
3379: over such resources, but will still treat the structure
3380: correctly. Thus, a complicated map with several branches, but
3381: consisting entirely of empty resources except for one beginning or
3382: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
3383: but only one resource will be returned.
3384:
3385: =back
3386:
3387: =head2 Normal Usage
3388:
3389: Normal usage of the iterator object is to do the following:
3390:
3391: my $it = $navmap->getIterator([your params here]);
3392: my $curRes;
3393: while ($curRes = $it->next()) {
3394: [your logic here]
3395: }
3396:
3397: Note that inside of the loop, it's frequently useful to check if
3398: "$curRes" is a reference or not with the reference function; only
3399: resource objects will be references, and any non-references will
3400: be the tokens described above.
3401:
3402: The next() routine can take two (optional) arguments:
3403: closeAllPages - if true will not recurse down a .page
3404: noblockcheck - passed to browsePriv() for passing as sixth arg to
3405: call to lonnet::allowed. This needs to be set if retrieveResources
3406: was already called from another routine called within lonnet::allowed,
3407: so as to prevent recursion.
3408:
3409: Also note there is some old code floating around that tries to track
3410: the depth of the iterator to see when it's done; do not copy that
3411: code. It is difficult to get right and harder to understand than
3412: this. They should be migrated to this new style.
3413:
3414: =cut
3415:
3416: # Here are the tokens for the iterator:
3417:
3418: sub END_ITERATOR { return 0; }
3419: sub BEGIN_MAP { return 1; } # begining of a new map
3420: sub END_MAP { return 2; } # end of the map
3421: sub BEGIN_BRANCH { return 3; } # beginning of a branch
3422: sub END_BRANCH { return 4; } # end of a branch
3423: sub FORWARD { return 1; } # go forward
3424: sub BACKWARD { return 2; }
3425:
3426: sub min {
3427: (my $a, my $b) = @_;
3428: if ($a < $b) { return $a; } else { return $b; }
3429: }
3430:
3431: sub new {
3432: # magic invocation to create a class instance
3433: my $proto = shift;
3434: my $class = ref($proto) || $proto;
3435: my $self = {};
3436:
3437: weaken($self->{NAV_MAP} = shift);
3438: return undef unless ($self->{NAV_MAP});
3439:
3440: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3441: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3442:
3443: # Handle the parameters
3444: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3445: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3446:
3447: # If the given resources are just the ID of the resource, get the
3448: # objects
3449: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3450: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3451: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3452: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3453:
3454: $self->{FILTER} = shift;
3455:
3456: # A hash, used as a set, of resource already seen
3457: $self->{ALREADY_SEEN} = shift;
3458: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3459: $self->{CONDITION} = shift;
3460:
3461: # Do we want to automatically follow "redirection" maps?
3462: $self->{FORCE_TOP} = shift;
3463:
3464: # Do we want to return the top-level map object (resource 0.0)?
3465: $self->{RETURN_0} = shift;
3466: # have we done that yet?
3467: $self->{HAVE_RETURNED_0} = 0;
3468:
3469: # Now, we need to pre-process the map, by walking forward and backward
3470: # over the parts of the map we're going to look at.
3471:
3472: # The processing steps are exactly the same, except for a few small
3473: # changes, so I bundle those up in the following list of two elements:
3474: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
3475: # first_resource).
3476: # This prevents writing nearly-identical code twice.
3477: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
3478: 'FIRST_RESOURCE'],
3479: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
3480: 'FINISH_RESOURCE'] );
3481:
3482: my $maxDepth = 0; # tracks max depth
3483:
3484: # If there is only one resource in this map, and it's a map, we
3485: # want to remember that, so the user can ask for the first map
3486: # that isn't just a redirector.
3487: my $resource; my $resourceCount = 0;
3488:
3489: # Documentation on this algorithm can be found in the CVS repository at
3490: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
3491: # in that file.
3492: # **1**
3493:
3494: foreach my $pass (@iterations) {
3495: my $direction = $pass->[0];
3496: my $valName = $pass->[1];
3497: my $nextResourceMethod = $pass->[2];
3498: my $firstResourceName = $pass->[3];
3499:
3500: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3501: $self->{FIRST_RESOURCE},
3502: $self->{FINISH_RESOURCE},
3503: {}, undef, 0, $direction);
3504:
3505: # prime the recursion
3506: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3507: $iterator->next();
3508: my $curRes = $iterator->next();
3509: my $depth = 1;
3510: while ($depth > 0) {
3511: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3512: if ($curRes == $iterator->END_MAP()) { $depth--; }
3513:
3514: if (ref($curRes)) {
3515: # If there's only one resource, this will save it
3516: # we have to filter empty resources from consideration here,
3517: # or even "empty", redirecting maps have two (start & finish)
3518: # or three (start, finish, plus redirector)
3519: if($direction == FORWARD && $curRes->src()) {
3520: $resource = $curRes; $resourceCount++;
3521: }
3522: my $resultingVal = $curRes->{DATA}->{$valName};
3523: my $nextResources = $curRes->$nextResourceMethod();
3524: my $nextCount = scalar(@{$nextResources});
3525:
3526: if ($nextCount == 1) { # **3**
3527: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3528: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3529: }
3530:
3531: if ($nextCount > 1) { # **4**
3532: foreach my $res (@{$nextResources}) {
3533: my $current = $res->{DATA}->{$valName} || 999999999;
3534: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3535: }
3536: }
3537: }
3538:
3539: # Assign the final val (**2**)
3540: if (ref($curRes) && $direction == BACKWARD()) {
3541: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3542: $curRes->{DATA}->{BOT_UP_VAL});
3543:
3544: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3545: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3546: }
3547:
3548: $curRes = $iterator->next();
3549: }
3550: }
3551:
3552: # Check: Was this only one resource, a map?
3553: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3554: my $firstResource = $resource->map_start();
3555: my $finishResource = $resource->map_finish();
3556: return Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3557: $finishResource, $self->{FILTER},
3558: $self->{ALREADY_SEEN},
3559: $self->{CONDITION},
3560: $self->{FORCE_TOP});
3561: }
3562:
3563: # Set up some bookkeeping information.
3564: $self->{CURRENT_DEPTH} = 0;
3565: $self->{MAX_DEPTH} = $maxDepth;
3566: $self->{STACK} = [];
3567: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3568: $self->{FINISHED} = 0; # When true, the iterator has finished
3569:
3570: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3571: push @{$self->{STACK}}, [];
3572: }
3573:
3574: # Prime the recursion w/ the first resource **5**
3575: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3576: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3577:
3578: bless ($self);
3579: return $self;
3580: }
3581:
3582: sub next {
3583: my $self = shift;
3584: my $closeAllPages=shift;
3585: my $noblockcheck = shift;
3586: if ($self->{FINISHED}) {
3587: return END_ITERATOR();
3588: }
3589:
3590: # If we want to return the top-level map object, and haven't yet,
3591: # do so.
3592: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3593: $self->{HAVE_RETURNED_0} = 1;
3594: my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
3595: return $self->{NAV_MAP}->getById('0.0');
3596: }
3597: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3598: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3599: return $self->BEGIN_MAP();
3600: }
3601:
3602: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3603: # grab the next from the recursive iterator
3604: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3605:
3606: # is it a begin or end map? If so, update the depth
3607: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3608: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3609:
3610: # Are we back at depth 0? If so, stop recursing
3611: if ($self->{RECURSIVE_DEPTH} == 0) {
3612: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3613: }
3614: return $next;
3615: }
3616:
3617: if (defined($self->{FORCE_NEXT})) {
3618: my $tmp = $self->{FORCE_NEXT};
3619: $self->{FORCE_NEXT} = undef;
3620: return $tmp;
3621: }
3622:
3623: # Have we not yet begun? If not, return BEGIN_MAP and
3624: # remember we've started.
3625: if ( !$self->{STARTED} ) {
3626: $self->{STARTED} = 1;
3627: return $self->BEGIN_MAP();
3628: }
3629:
3630: # Here's the guts of the iterator.
3631:
3632: # Find the next resource, if any.
3633: my $found = 0;
3634: my $i = $self->{MAX_DEPTH};
3635: my $newDepth;
3636: my $here;
3637: while ( $i >= 0 && !$found ) {
3638: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3639: $here = pop @{$self->{STACK}->[$i]}; # **7**
3640: $found = 1;
3641: $newDepth = $i;
3642: }
3643: $i--;
3644: }
3645:
3646: # If we still didn't find anything, we're done.
3647: if ( !$found ) {
3648: # We need to get back down to the correct branch depth
3649: if ( $self->{CURRENT_DEPTH} > 0 ) {
3650: $self->{CURRENT_DEPTH}--;
3651: return END_BRANCH();
3652: } else {
3653: $self->{FINISHED} = 1;
3654: return END_MAP();
3655: }
3656: }
3657:
3658: # If this is not a resource, it must be an END_BRANCH marker we want
3659: # to return directly.
3660: if (!ref($here)) { # **8**
3661: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3662: $self->{CURRENT_DEPTH}--;
3663: return $here;
3664: }
3665: }
3666:
3667: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3668: $self->{HERE} = $here;
3669:
3670: # Get to the right level
3671: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3672: push @{$self->{STACK}->[$newDepth]}, $here;
3673: $self->{CURRENT_DEPTH}--;
3674: return END_BRANCH();
3675: }
3676: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3677: push @{$self->{STACK}->[$newDepth]}, $here;
3678: $self->{CURRENT_DEPTH}++;
3679: return BEGIN_BRANCH();
3680: }
3681:
3682: # If we made it here, we have the next resource, and we're at the
3683: # right branch level. So let's examine the resource for where
3684: # we can get to from here.
3685:
3686: # So we need to look at all the resources we can get to from here,
3687: # categorize them if we haven't seen them, remember if we have a new
3688: my $nextUnfiltered = $here->getNext();
3689:
3690:
3691: my $maxDepthAdded = -1;
3692:
3693: for (@$nextUnfiltered) {
3694: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3695: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3696: push @{$self->{STACK}->[$depth]}, $_;
3697: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3698: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3699: }
3700: }
3701:
3702: # Is this the end of a branch? If so, all of the resources examined above
3703: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3704: # marker onto the stack so we don't forget.
3705: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3706: # BC branch and gets to C, it will see F as the only next resource, but it's
3707: # one level lower. Thus, this is the end of the branch, since there are no
3708: # more resources added to this level or above.
3709: # We don't do this if the examined resource is the finish resource,
3710: # because the condition given above is true, but the "END_MAP" will
3711: # take care of things and we should already be at depth 0.
3712: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3713: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3714: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3715: }
3716:
3717: # That ends the main iterator logic. Now, do we want to recurse
3718: # down this map (if this resource is a map)?
3719: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3720: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3721: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3722: my $firstResource = $self->{HERE}->map_start();
3723: my $finishResource = $self->{HERE}->map_finish();
3724: $self->{RECURSIVE_ITERATOR} =
3725: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3726: $finishResource, $self->{FILTER},
3727: $self->{ALREADY_SEEN},
3728: $self->{CONDITION},
3729: $self->{FORCE_TOP});
3730: }
3731:
3732: # If this is a blank resource, don't actually return it.
3733: # Should you ever find you need it, make sure to add an option to the code
3734: # that you can use; other things depend on this behavior.
3735: my $browsePriv = $self->{HERE}->browsePriv($noblockcheck);
3736: if (!$self->{HERE}->src() ||
3737: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3738: return $self->next($closeAllPages);
3739: }
3740:
3741: return $self->{HERE};
3742:
3743: }
3744:
3745: =pod
3746:
3747: The other method available on the iterator is B<getStack>, which
3748: returns an array populated with the current 'stack' of maps, as
3749: references to the resource objects. Example: This is useful when
3750: making the navigation map, as we need to check whether we are under a
3751: page map to see if we need to link directly to the resource, or to the
3752: page. The first elements in the array will correspond to the top of
3753: the stack (most inclusive map).
3754:
3755: =cut
3756:
3757: sub getStack {
3758: my $self=shift;
3759:
3760: my @stack;
3761:
3762: $self->populateStack(\@stack);
3763:
3764: return \@stack;
3765: }
3766:
3767: # Private method: Calls the iterators recursively to populate the stack.
3768: sub populateStack {
3769: my $self=shift;
3770: my $stack = shift;
3771:
3772: push @$stack, $self->{HERE} if ($self->{HERE});
3773:
3774: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3775: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3776: }
3777: }
3778:
3779: 1;
3780:
3781: package Apache::lonnavmaps::DFSiterator;
3782: use Scalar::Util qw(weaken);
3783: use Apache::lonnet;
3784:
3785: # Not documented in the perldoc: This is a simple iterator that just walks
3786: # through the nav map and presents the resources in a depth-first search
3787: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3788: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3789: # useful for pre-processing of some kind, and is in fact used by the main
3790: # iterator that way, but that's about it.
3791: # One could imagine merging this into the init routine of the main iterator,
3792: # but this might as well be left separate, since it is possible some other
3793: # use might be found for it. - Jeremy
3794:
3795: # Unlike the main iterator, this DOES return all resources, even blank ones.
3796: # The main iterator needs them to correctly preprocess the map.
3797:
3798: sub BEGIN_MAP { return 1; } # begining of a new map
3799: sub END_MAP { return 2; } # end of the map
3800: sub FORWARD { return 1; } # go forward
3801: sub BACKWARD { return 2; }
3802:
3803: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3804: # filter hash ref (or undef), already seen hash or undef, condition
3805: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3806: sub new {
3807: # magic invocation to create a class instance
3808: my $proto = shift;
3809: my $class = ref($proto) || $proto;
3810: my $self = {};
3811:
3812: weaken($self->{NAV_MAP} = shift);
3813: return undef unless ($self->{NAV_MAP});
3814:
3815: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3816: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3817:
3818: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3819: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3820:
3821: # If the given resources are just the ID of the resource, get the
3822: # objects
3823: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3824: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3825: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3826: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3827:
3828: $self->{FILTER} = shift;
3829:
3830: # A hash, used as a set, of resource already seen
3831: $self->{ALREADY_SEEN} = shift;
3832: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3833: $self->{CONDITION} = shift;
3834: $self->{DIRECTION} = shift || FORWARD();
3835:
3836: # Flag: Have we started yet?
3837: $self->{STARTED} = 0;
3838:
3839: # Should we continue calling the recursive iterator, if any?
3840: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3841: # The recursive iterator, if any
3842: $self->{RECURSIVE_ITERATOR} = undef;
3843: # Are we recursing on a map, or a branch?
3844: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3845: # And the count of how deep it is, so that this iterator can keep track of
3846: # when to pick back up again.
3847: $self->{RECURSIVE_DEPTH} = 0;
3848:
3849: # For keeping track of our branches, we maintain our own stack
3850: $self->{STACK} = [];
3851:
3852: # Start with the first resource
3853: if ($self->{DIRECTION} == FORWARD) {
3854: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3855: } else {
3856: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3857: }
3858:
3859: bless($self);
3860: return $self;
3861: }
3862:
3863: sub next {
3864: my $self = shift;
3865:
3866: # Are we using a recursive iterator? If so, pull from that and
3867: # watch the depth; we want to resume our level at the correct time.
3868: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3869: # grab the next from the recursive iterator
3870: my $next = $self->{RECURSIVE_ITERATOR}->next();
3871:
3872: # is it a begin or end map? Update depth if so
3873: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3874: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3875:
3876: # Are we back at depth 0? If so, stop recursing.
3877: if ($self->{RECURSIVE_DEPTH} == 0) {
3878: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3879: }
3880:
3881: return $next;
3882: }
3883:
3884: # Is there a current resource to grab? If not, then return
3885: # END_MAP, which will end the iterator.
3886: if (scalar(@{$self->{STACK}}) == 0) {
3887: return $self->END_MAP();
3888: }
3889:
3890: # Have we not yet begun? If not, return BEGIN_MAP and
3891: # remember that we've started.
3892: if ( !$self->{STARTED} ) {
3893: $self->{STARTED} = 1;
3894: return $self->BEGIN_MAP;
3895: }
3896:
3897: # Get the next resource in the branch
3898: $self->{HERE} = pop @{$self->{STACK}};
3899:
3900: # remember that we've seen this, so we don't return it again later
3901: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3902:
3903: # Get the next possible resources
3904: my $nextUnfiltered;
3905: if ($self->{DIRECTION} == FORWARD()) {
3906: $nextUnfiltered = $self->{HERE}->getNext();
3907: } else {
3908: $nextUnfiltered = $self->{HERE}->getPrevious();
3909: }
3910: my $next = [];
3911:
3912: # filter the next possibilities to remove things we've
3913: # already seen.
3914: foreach my $item (@$nextUnfiltered) {
3915: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3916: push @$next, $item;
3917: }
3918: }
3919:
3920: while (@$next) {
3921: # copy the next possibilities over to the stack
3922: push @{$self->{STACK}}, shift @$next;
3923: }
3924:
3925: # If this is a map and we want to recurse down it... (not filtered out)
3926: if ($self->{HERE}->is_map() &&
3927: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3928: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3929: my $firstResource = $self->{HERE}->map_start();
3930: my $finishResource = $self->{HERE}->map_finish();
3931:
3932: $self->{RECURSIVE_ITERATOR} =
3933: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3934: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3935: $self->{CONDITION}, $self->{DIRECTION});
3936: }
3937:
3938: return $self->{HERE};
3939: }
3940:
3941: # Identical to the full iterator methods of the same name. Hate to copy/paste
3942: # but I also hate to "inherit" either iterator from the other.
3943:
3944: sub getStack {
3945: my $self=shift;
3946:
3947: my @stack;
3948:
3949: $self->populateStack(\@stack);
3950:
3951: return \@stack;
3952: }
3953:
3954: # Private method: Calls the iterators recursively to populate the stack.
3955: sub populateStack {
3956: my $self=shift;
3957: my $stack = shift;
3958:
3959: push @$stack, $self->{HERE} if ($self->{HERE});
3960:
3961: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3962: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3963: }
3964: }
3965:
3966: 1;
3967:
3968: package Apache::lonnavmaps::resource;
3969: use Scalar::Util qw(weaken);
3970: use Apache::lonnet;
3971:
3972: =pod
3973:
3974: =head1 Object: resource
3975:
3976: X<resource, navmap object>
3977: A resource object encapsulates a resource in a resource map, allowing
3978: easy manipulation of the resource, querying the properties of the
3979: resource (including user properties), and represents a reference that
3980: can be used as the canonical representation of the resource by
3981: lonnavmap clients like renderers.
3982:
3983: A resource only makes sense in the context of a navmap, as some of the
3984: data is stored in the navmap object.
3985:
3986: You will probably never need to instantiate this object directly. Use
3987: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3988: starting resource.
3989:
3990: Resource objects respect the parameter_hiddenparts, which suppresses
3991: various parts according to the wishes of the map author. As of this
3992: writing, there is no way to override this parameter, and suppressed
3993: parts will never be returned, nor will their response types or ids be
3994: stored.
3995:
3996: =head2 Overview
3997:
3998: A B<Resource> is the most granular type of object in LON-CAPA that can
3999: be included in a course. It can either be a particular resource, like
4000: an HTML page, external resource, problem, etc., or it can be a
4001: container sequence, such as a "page" or a "map".
4002:
4003: To see a sequence from the user's point of view, please see the
4004: B<Creating a Course: Maps and Sequences> chapter of the Author's
4005: Manual.
4006:
4007: A Resource Object, once obtained from a navmap object via a B<getBy*>
4008: method of the navmap, or from an iterator, allows you to query
4009: information about that resource.
4010:
4011: Generally, you do not ever want to create a resource object yourself,
4012: so creation has been left undocumented. Always retrieve resources
4013: from navmap objects.
4014:
4015: =head3 Identifying Resources
4016:
4017: X<big hash>Every resource is identified by a Resource ID in the big hash that is
4018: unique to that resource for a given course. X<resource ID, in big hash>
4019: The Resource ID has the form #.#, where the first number is the same
4020: for every resource in a map, and the second is unique. For instance,
4021: for a course laid out like this:
4022:
4023: * Problem 1
4024: * Map
4025: * Resource 2
4026: * Resource 3
4027:
4028: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
4029: C<Resource 3> will share a first number. The second number may end up
4030: re-used between the two groups.
4031:
4032: The resource ID is only used in the big hash, but can be used in the
4033: context of a course to identify a resource easily. (For instance, the
4034: printing system uses it to record which resources from a sequence you
4035: wish to print.)
4036:
4037: X<symb> X<resource, symb>
4038: All resources also have B<symb>s, which uniquely identify a resource
4039: in a course. Many internal LON-CAPA functions expect a symb. A symb
4040: carries along with it the URL of the resource, and the map it appears
4041: in. Symbs are much larger than resource IDs.
4042:
4043: =cut
4044:
4045: sub new {
4046: # magic invocation to create a class instance
4047: my $proto = shift;
4048: my $class = ref($proto) || $proto;
4049: my $self = {};
4050:
4051: weaken($self->{NAV_MAP} = shift);
4052: $self->{ID} = shift;
4053:
4054: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
4055: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
4056:
4057: # Store this new resource in the parent nav map's cache.
4058: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
4059: $self->{RESOURCE_ERROR} = 0;
4060:
4061: $self->{DUEDATE_CACHE} = undef;
4062:
4063: # A hash that can be used by two-pass algorithms to store data
4064: # about this resource in. Not used by the resource object
4065: # directly.
4066: $self->{DATA} = {};
4067:
4068: bless($self);
4069:
4070: # This is a speed optimization, to avoid calling symb() too often.
4071: $self->{SYMB} = $self->symb();
4072:
4073: return $self;
4074: }
4075:
4076: # private function: simplify the NAV_HASH lookups we keep doing
4077: # pass the name, and to automatically append my ID, pass a true val on the
4078: # second param
4079: sub navHash {
4080: my $self = shift;
4081: my $param = shift;
4082: my $id = shift;
4083: my $arg = $param . ($id?$self->{ID}:"");
4084: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
4085: return $self->{NAV_MAP}->navhash($arg);
4086: }
4087: return;
4088: }
4089:
4090: =pod
4091:
4092: =head2 Methods
4093:
4094: Once you have a resource object, here's what you can do with it:
4095:
4096: =head3 Attribute Retrieval
4097:
4098: Every resource has certain attributes that can be retrieved and used:
4099:
4100: =over 4
4101:
4102: =item * B<ID>: Every resource has an ID that is unique for that
4103: resource in the course it is in. The ID is actually in the hash
4104: representing the resource, so for a resource object $res, obtain
4105: it via C<$res->{ID}).
4106:
4107: =item * B<compTitle>:
4108:
4109: Returns a "composite title", that is equal to $res->title() if the
4110: resource has a title, and is otherwise the last part of the URL (e.g.,
4111: "problem.problem").
4112:
4113: =item * B<ext>:
4114:
4115: Returns true if the resource is external.
4116:
4117: =item * B<kind>:
4118:
4119: Returns the kind of the resource from the compiled nav map.
4120:
4121: =item * B<randomout>:
4122:
4123: Returns true if this resource was chosen to NOT be shown to the user
4124: by the random map selection feature. In other words, this is usually
4125: false.
4126:
4127: =item * B<randompick>:
4128:
4129: Returns the number of randomly picked items for a map if the randompick
4130: feature is being used on the map.
4131:
4132: =item * B<randomorder>:
4133:
4134: Returns true for a map if the randomorder feature is being used on the
4135: map.
4136:
4137: =item * B<src>:
4138:
4139: Returns the source for the resource.
4140:
4141: =item * B<symb>:
4142:
4143: Returns the symb for the resource.
4144:
4145: =item * B<title>:
4146:
4147: Returns the title of the resource.
4148:
4149: =back
4150:
4151: =cut
4152:
4153: # These info functions can be used directly, as they don't return
4154: # resource information.
4155: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
4156: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
4157: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
4158: sub from { my $self=shift; return $self->navHash("from_", 1); }
4159: # considered private and undocumented
4160: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
4161: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
4162: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
4163: sub randompick {
4164: my $self = shift;
4165: my $randompick = $self->parmval('randompick');
4166: return $randompick;
4167: }
4168: sub randomorder {
4169: my $self = shift;
4170: my $randomorder = $self->parmval('randomorder');
4171: return ($randomorder =~ /^yes$/i);
4172: }
4173: sub link {
4174: my $self=shift;
4175: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
4176: return $self->src;
4177: }
4178: sub src {
4179: my $self=shift;
4180: return $self->navHash("src_", 1);
4181: }
4182: sub shown_symb {
4183: my $self=shift;
4184: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->{SYMB});}
4185: return $self->{SYMB};
4186: }
4187: sub id {
4188: my $self=shift;
4189: return $self->{ID};
4190: }
4191: sub enclosing_map_src {
4192: my $self=shift;
4193: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
4194: return $self->navHash('map_id_'.$first);
4195: }
4196: sub symb {
4197: my $self=shift;
4198: if (defined($self->{SYMB})) { return $self->{SYMB}; }
4199: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
4200: my $symbSrc = &Apache::lonnet::declutter($self->src());
4201: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
4202: . '___' . $second . '___' . $symbSrc;
4203: return &Apache::lonnet::symbclean($symb);
4204: }
4205: sub wrap_symb {
4206: my $self = shift;
4207: return $self->{NAV_MAP}->wrap_symb($self->{SYMB});
4208: }
4209: sub title {
4210: my $self=shift;
4211: if ($self->{ID} eq '0.0') {
4212: # If this is the top-level map, return the title of the course
4213: # since this map can not be titled otherwise.
4214: return $env{'course.'.$env{'request.course.id'}.'.description'};
4215: }
4216: return $self->navHash("title_", 1); }
4217: # considered private and undocumented
4218: sub to { my $self=shift; return $self->navHash("to_", 1); }
4219: sub condition {
4220: my $self=shift;
4221: my $undercond=$self->navHash("undercond_", 1);
4222: if (!defined($undercond)) { return 1; };
4223: my $condid=$self->navHash("condid_$undercond");
4224: if (!defined($condid)) { return 1; };
4225: my $condition=&Apache::lonnet::directcondval($condid);
4226: return $condition;
4227: }
4228: sub condval {
4229: my $self=shift;
4230: my ($pathname,$filename) =
4231: &Apache::lonnet::split_uri_for_cond($self->src());
4232:
4233: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
4234: /\&\Q$filename\E\:([\d\|]+)\&/);
4235: if ($match) {
4236: return &Apache::lonnet::condval($1);
4237: }
4238: return 0;
4239: }
4240: sub compTitle {
4241: my $self = shift;
4242: my $title = $self->title();
4243: $title=~s/\&colon\;/\:/gs;
4244: if (!$title) {
4245: $title = $self->src();
4246: $title = substr($title, rindex($title, '/') + 1);
4247: }
4248: return $title;
4249: }
4250:
4251: =pod
4252:
4253: B<Predicate Testing the Resource>
4254:
4255: These methods are shortcuts to deciding if a given resource has a given property.
4256:
4257: =over 4
4258:
4259: =item * B<is_map>:
4260:
4261: Returns true if the resource is a map type.
4262:
4263: =item * B<is_problem>:
4264:
4265: Returns true if the resource is a problem type, false
4266: otherwise. (Looks at the extension on the src field; might need more
4267: to work correctly.)
4268:
4269: =item * B<is_page>:
4270:
4271: Returns true if the resource is a page.
4272:
4273: =item * B<is_sequence>:
4274:
4275: Returns true if the resource is a sequence.
4276:
4277: =back
4278:
4279: =cut
4280:
4281: sub hasResource {
4282: my $self = shift;
4283: return $self->{NAV_MAP}->hasResource(@_);
4284: }
4285:
4286: sub retrieveResources {
4287: my $self = shift;
4288: return $self->{NAV_MAP}->retrieveResources(@_);
4289: }
4290:
4291: sub is_exam {
4292: my ($self,$part) = @_;
4293: my $type = $self->parmval('type',$part);
4294: if ($type eq 'exam') {
4295: return 1;
4296: }
4297: if ($self->src() =~ /\.(exam)$/) {
4298: return 1;
4299: }
4300: return 0;
4301: }
4302: sub is_html {
4303: my $self=shift;
4304: my $src = $self->src();
4305: return ($src =~ /html$/);
4306: }
4307: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
4308: sub is_page {
4309: my $self=shift;
4310: my $src = $self->src();
4311: return $self->navHash("is_map_", 1) &&
4312: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
4313: }
4314: sub is_practice {
4315: my $self=shift;
4316: my ($part) = @_;
4317: my $type = $self->parmval('type',$part);
4318: if ($type eq 'practice') {
4319: return 1;
4320: }
4321: return 0;
4322: }
4323: sub is_problem {
4324: my $self=shift;
4325: my $src = $self->src();
4326: if ($src =~ /$LONCAPA::assess_re/) {
4327: return !($self->is_practice());
4328: }
4329: return 0;
4330: }
4331: #
4332: # The has below is the set of status that are considered 'incomplete'
4333: #
4334: my %incomplete_hash =
4335: (
4336: TRIES_LEFT() => 1,
4337: OPEN() => 1,
4338: ATTEMPTED() => 1
4339:
4340: );
4341: #
4342: # Return tru if a problem is incomplete... for now incomplete means that
4343: # any part of the problem is incomplete.
4344: # Note that if the resources is not a problem, 0 is returned.
4345: #
4346: sub is_incomplete {
4347: my $self = shift;
4348: if ($self->is_problem()) {
4349: foreach my $part (@{$self->parts()}) {
4350: if (exists($incomplete_hash{$self->status($part)})) {
4351: return 1;
4352: }
4353: }
4354: }
4355: return 0;
4356:
4357: }
4358: sub is_raw_problem {
4359: my $self=shift;
4360: my $src = $self->src();
4361: if ($src =~ /$LONCAPA::assess_re/) {
4362: return 1;
4363: }
4364: return 0;
4365: }
4366:
4367: sub contains_problem {
4368: my $self=shift;
4369: if ($self->is_page()) {
4370: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
4371: return $hasProblem;
4372: }
4373: return 0;
4374: }
4375: sub map_contains_problem {
4376: my $self=shift;
4377: if ($self->is_map()) {
4378: my $has_problem=
4379: $self->hasResource($self,sub { $_[0]->is_problem() },1);
4380: return $has_problem;
4381: }
4382: return 0;
4383: }
4384: sub is_sequence {
4385: my $self=shift;
4386: return $self->navHash("is_map_", 1) &&
4387: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
4388: }
4389: sub is_survey {
4390: my $self = shift();
4391: my $part = shift();
4392: my $type = $self->parmval('type',$part);
4393: if (($type eq 'survey') || ($type eq 'surveycred')) {
4394: return 1;
4395: }
4396: if ($self->src() =~ /\.(survey)$/) {
4397: return 1;
4398: }
4399: return 0;
4400: }
4401: sub is_anonsurvey {
4402: my $self = shift();
4403: my $part = shift();
4404: my $type = $self->parmval('type',$part);
4405: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
4406: return 1;
4407: }
4408: return 0;
4409: }
4410: sub is_task {
4411: my $self=shift;
4412: my $src = $self->src();
4413: return ($src =~ /\.(task)$/)
4414: }
4415:
4416: sub is_empty_sequence {
4417: my $self=shift;
4418: my $src = $self->src();
4419: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
4420: }
4421:
4422: # Private method: Shells out to the parmval in the nav map, handler parts.
4423: sub parmval {
4424: my $self = shift;
4425: my $what = shift;
4426: my $part = shift;
4427: if (!defined($part)) {
4428: $part = '0';
4429: }
4430: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->{SYMB});
4431: }
4432:
4433: =pod
4434:
4435: B<Map Methods>
4436:
4437: These methods are useful for getting information about the map
4438: properties of the resource, if the resource is a map (B<is_map>).
4439:
4440: =over 4
4441:
4442: =item * B<map_finish>:
4443:
4444: Returns a reference to a resource object corresponding to the finish
4445: resource of the map.
4446:
4447: =item * B<map_pc>:
4448:
4449: Returns the pc value of the map, which is the first number that
4450: appears in the resource ID of the resources in the map, and is the
4451: number that appears around the middle of the symbs of the resources in
4452: that map.
4453:
4454: =item * B<map_start>:
4455:
4456: Returns a reference to a resource object corresponding to the start
4457: resource of the map.
4458:
4459: =item * B<map_type>:
4460:
4461: Returns a string with the type of the map in it.
4462:
4463: =item * B<map_hierarchy>:
4464:
4465: Returns a string with a comma-separated ordered list of map_pc IDs
4466: for the hierarchy of maps containing a map, with the top level
4467: map first, then descending to deeper levels, with the enclosing map last.
4468:
4469: =item * B<map_breadcrumbs>:
4470:
4471: Same as map_hierarchy, except maps containing only a single itemm if
4472: it's a map, or containing no items are omitted, unless it's the top
4473: level map (map_pc = 1), which is always included.
4474:
4475: =back
4476:
4477: =cut
4478:
4479: sub map_finish {
4480: my $self = shift;
4481: my $src = $self->src();
4482: $src = &Apache::lonnet::clutter($src);
4483: my $res = $self->navHash("map_finish_$src", 0);
4484: $res = $self->{NAV_MAP}->getById($res);
4485: return $res;
4486: }
4487: sub map_pc {
4488: my $self = shift;
4489: my $src = $self->src();
4490: return $self->navHash("map_pc_$src", 0);
4491: }
4492: sub map_start {
4493: my $self = shift;
4494: my $src = $self->src();
4495: $src = &Apache::lonnet::clutter($src);
4496: my $res = $self->navHash("map_start_$src", 0);
4497: $res = $self->{NAV_MAP}->getById($res);
4498: return $res;
4499: }
4500: sub map_type {
4501: my $self = shift;
4502: my $pc = $self->map_pc();
4503: return $self->navHash("map_type_$pc", 0);
4504: }
4505: sub map_hierarchy {
4506: my $self = shift;
4507: my $pc = $self->map_pc();
4508: return $self->navHash("map_hierarchy_$pc", 0);
4509: }
4510: sub map_breadcrumbs {
4511: my $self = shift;
4512: my $pc = $self->map_pc();
4513: return $self->navHash("map_breadcrumbs_$pc", 0);
4514: }
4515:
4516: #####
4517: # Property queries
4518: #####
4519:
4520: # These functions will be responsible for returning the CORRECT
4521: # VALUE for the parameter, no matter what. So while they may look
4522: # like direct calls to parmval, they can be more than that.
4523: # So, for instance, the duedate function should use the "duedatetype"
4524: # information, rather than the resource object user.
4525:
4526: =pod
4527:
4528: =head2 Resource Parameters
4529:
4530: In order to use the resource parameters correctly, the nav map must
4531: have been instantiated with genCourseAndUserOptions set to true, so
4532: the courseopt and useropt is read correctly. Then, you can call these
4533: functions to get the relevant parameters for the resource. Each
4534: function defaults to part "0", but can be directed to another part by
4535: passing the part as the parameter.
4536:
4537: These methods are responsible for getting the parameter correct, not
4538: merely reflecting the contents of the GDBM hashes. As we move towards
4539: dates relative to other dates, these methods should be updated to
4540: reflect that. (Then, anybody using these methods will not have to update
4541: their code.)
4542:
4543: =over 4
4544:
4545:
4546: =item * B<printable>
4547:
4548: returns true if the current date is such that the
4549: specified resource part is printable.
4550:
4551:
4552: =item * B<resprintable>
4553:
4554: Returns true if all parts in the resource are printable making the
4555: entire resource printable.
4556:
4557: =item * B<acc>
4558:
4559: Get the Client IP/Name Access Control information.
4560:
4561: =item * B<answerdate>:
4562:
4563: Get the answer-reveal date for the problem.
4564:
4565: =item * B<awarded>:
4566:
4567: Gets the awarded value for the problem part. Requires genUserData set to
4568: true when the navmap object was created.
4569:
4570: =item * B<duedate>:
4571:
4572: Get the due date for the problem.
4573:
4574: =item * B<tries>:
4575:
4576: Get the number of tries the student has used on the problem.
4577:
4578: =item * B<maxtries>:
4579:
4580: Get the number of max tries allowed.
4581:
4582: =item * B<opendate>:
4583:
4584: Get the open date for the problem.
4585:
4586: =item * B<sig>:
4587:
4588: Get the significant figures setting.
4589:
4590: =item * B<tol>:
4591:
4592: Get the tolerance for the problem.
4593:
4594: =item * B<tries>:
4595:
4596: Get the number of tries the user has already used on the problem.
4597:
4598: =item * B<type>:
4599:
4600: Get the question type for the problem.
4601:
4602: =item * B<weight>:
4603:
4604: Get the weight for the problem.
4605:
4606: =back
4607:
4608: =cut
4609:
4610:
4611:
4612:
4613: sub printable {
4614:
4615: my ($self, $part) = @_;
4616:
4617: # The following cases apply:
4618: # - If a start date is not set, it is replaced by the open date.
4619: # - Ditto for start/open replaced by content open.
4620: # - If neither start nor printdates are set the part is printable.
4621: # - Start date set but no end date: Printable if now >= start date.
4622: # - End date set but no start date: Printable if now <= end date.
4623: # - both defined: printable if start <= now <= end
4624: #
4625:
4626: # Get the print open/close dates for the resource.
4627:
4628: my $start = $self->parmval("printstartdate", $part);
4629: my $end = $self->parmval("printenddate", $part);
4630:
4631: if (!$start) {
4632: $start = $self->parmval("opendate", $part);
4633: }
4634: if (!$start) {
4635: $start = $self->parmval("contentopen", $part);
4636: }
4637:
4638:
4639: my $now = time();
4640:
4641:
4642: my $startok = 1;
4643: my $endok = 1;
4644:
4645: if ((defined $start) && ($start ne '')) {
4646: $startok = $start <= $now;
4647: }
4648: if ((defined $end) && ($end != '')) {
4649: $endok = $end >= $now;
4650: }
4651: return $startok && $endok;
4652: }
4653:
4654: sub resprintable {
4655: my $self = shift;
4656:
4657: # get parts...or realize there are no parts.
4658:
4659: my $partsref = $self->parts();
4660: my @parts = @$partsref;
4661:
4662: if (!@parts) {
4663: return $self->printable(0);
4664: } else {
4665: foreach my $part (@parts) {
4666: if (!$self->printable($part)) {
4667: return 0;
4668: }
4669: }
4670: return 1;
4671: }
4672: }
4673:
4674: sub acc {
4675: (my $self, my $part) = @_;
4676: my $acc = $self->parmval("acc", $part);
4677: return $acc;
4678: }
4679: sub answerdate {
4680: (my $self, my $part) = @_;
4681: # Handle intervals
4682: my $answerdatetype = $self->parmval("answerdate.type", $part);
4683: my $answerdate = $self->parmval("answerdate", $part);
4684: my $duedate = $self->parmval("duedate", $part);
4685: if ($answerdatetype eq 'date_interval') {
4686: $answerdate = $duedate + $answerdate;
4687: }
4688: return $answerdate;
4689: }
4690: sub awarded {
4691: my $self = shift; my $part = shift;
4692: $self->{NAV_MAP}->get_user_data();
4693: if (!defined($part)) { $part = '0'; }
4694: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.awarded'};
4695: }
4696: sub taskversion {
4697: my $self = shift; my $part = shift;
4698: $self->{NAV_MAP}->get_user_data();
4699: if (!defined($part)) { $part = '0'; }
4700: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.version'};
4701: }
4702: sub taskstatus {
4703: my $self = shift; my $part = shift;
4704: $self->{NAV_MAP}->get_user_data();
4705: if (!defined($part)) { $part = '0'; }
4706: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
4707: }
4708: sub solved {
4709: my $self = shift; my $part = shift;
4710: $self->{NAV_MAP}->get_user_data();
4711: if (!defined($part)) { $part = '0'; }
4712: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.solved'};
4713: }
4714: sub checkedin {
4715: my $self = shift; my $part = shift;
4716: $self->{NAV_MAP}->get_user_data();
4717: if (!defined($part)) { $part = '0'; }
4718: if ($self->is_task()) {
4719: my $version = $self->taskversion($part);
4720: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4721: } else {
4722: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin.slot'});
4723: }
4724: }
4725: # this should work exactly like the copy in lonhomework.pm
4726: # Why is there a copy in lonhomework? Why not centralized?
4727: #
4728: # TODO: Centralize duedate.
4729: #
4730:
4731: sub duedate {
4732: (my $self, my $part) = @_;
4733: if (defined ($self->{DUEDATE_CACHE}->{$part})) {
4734: return $self->{DUEDATE_CACHE}->{$part};
4735: }
4736: my $date;
4737: my @interval=$self->parmval("interval", $part);
4738: my $due_date=$self->parmval("duedate", $part);
4739: if ($interval[0] =~ /^(\d+)/) {
4740: my $timelimit = $1;
4741: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4742: $self->{SYMB});
4743: if (defined($first_access)) {
4744: my $interval = $first_access+$timelimit;
4745: $date = (!$due_date || $interval < $due_date) ? $interval
4746: : $due_date;
4747: } else {
4748: $date = $due_date;
4749: }
4750: } else {
4751: $date = $due_date;
4752: }
4753: $self->{DUEDATE_CACHE}->{$part} = $date;
4754: return $date;
4755: }
4756: sub handgrade {
4757: (my $self, my $part) = @_;
4758: my @response_ids = $self->responseIds($part);
4759: if (@response_ids) {
4760: foreach my $response_id (@response_ids) {
4761: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4762: if (lc($handgrade) eq 'yes') {
4763: return 'yes';
4764: }
4765: }
4766: }
4767: my $handgrade = $self->parmval("handgrade", $part);
4768: return $handgrade;
4769: }
4770: sub maxtries {
4771: (my $self, my $part) = @_;
4772: my $maxtries = $self->parmval("maxtries", $part);
4773: return $maxtries;
4774: }
4775: sub opendate {
4776: (my $self, my $part) = @_;
4777: my $opendatetype = $self->parmval("opendate.type", $part);
4778: my $opendate = $self->parmval("opendate", $part);
4779: if ($opendatetype eq 'date_interval') {
4780: my $duedate = $self->duedate($part);
4781: $opendate = $duedate - $opendate;
4782: }
4783: return $opendate;
4784: }
4785: sub problemstatus {
4786: (my $self, my $part) = @_;
4787: my $problemstatus = $self->parmval("problemstatus", $part);
4788: return lc($problemstatus);
4789: }
4790: sub sig {
4791: (my $self, my $part) = @_;
4792: my $sig = $self->parmval("sig", $part);
4793: return $sig;
4794: }
4795: sub tol {
4796: (my $self, my $part) = @_;
4797: my $tol = $self->parmval("tol", $part);
4798: return $tol;
4799: }
4800: sub tries {
4801: my $self = shift;
4802: my $tries = $self->queryRestoreHash('tries', shift);
4803: if (!defined($tries)) { return '0';}
4804: return $tries;
4805: }
4806: sub type {
4807: (my $self, my $part) = @_;
4808: my $type = $self->parmval("type", $part);
4809: return $type;
4810: }
4811: sub weight {
4812: my $self = shift; my $part = shift;
4813: if (!defined($part)) { $part = '0'; }
4814: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4815: $self->{SYMB}, $self->{DOMAIN},
4816: $self->{USERNAME},
4817: $env{'request.course.sec'});
4818: return $weight;
4819: }
4820: sub part_display {
4821: my $self= shift(); my $partID = shift();
4822: if (! defined($partID)) { $partID = '0'; }
4823: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4824: $self->{SYMB});
4825: if (! defined($display) || $display eq '') {
4826: $display = $partID;
4827: }
4828: return $display;
4829: }
4830: sub slot_control {
4831: my $self=shift(); my $part = shift();
4832: if (!defined($part)) { $part = '0'; }
4833: my $useslots = $self->parmval("useslots", $part);
4834: my $availablestudent = $self->parmval("availablestudent", $part);
4835: my $available = $self->parmval("available", $part);
4836: return ($useslots,$availablestudent,$available);
4837: }
4838:
4839: # Multiple things need this
4840: sub getReturnHash {
4841: my $self = shift;
4842:
4843: if (!defined($self->{RETURN_HASH})) {
4844: my %tmpHash = &Apache::lonnet::restore($self->{SYMB},undef,$self->{DOMAIN},$self->{USERNAME});
4845: $self->{RETURN_HASH} = \%tmpHash;
4846: }
4847: }
4848:
4849: ######
4850: # Status queries
4851: ######
4852:
4853: # These methods query the status of problems.
4854:
4855: # If we need to count parts, this function determines the number of
4856: # parts from the metadata. When called, it returns a reference to a list
4857: # of strings corresponding to the parts. (Thus, using it in a scalar context
4858: # tells you how many parts you have in the problem:
4859: # $partcount = scalar($resource->countParts());
4860: # Don't use $self->{PARTS} directly because you don't know if it's been
4861: # computed yet.
4862:
4863: =pod
4864:
4865: =head2 Resource misc
4866:
4867: Misc. functions for the resource.
4868:
4869: =over 4
4870:
4871: =item * B<hasDiscussion>:
4872:
4873: Returns a false value if there has been discussion since the user last
4874: logged in, true if there has. Always returns false if the discussion
4875: data was not extracted when the nav map was constructed.
4876:
4877: =item * B<last_post_time>:
4878:
4879: Returns a false value if there hasn't been discussion otherwise returns
4880: unix timestamp of last time a discussion posting (or edit) was made.
4881:
4882: =item * B<discussion_info>:
4883:
4884: optional argument is a filter (currently can be 'unread');
4885: returns in scalar context the count of the number of discussion postings.
4886:
4887: returns in list context both the count of postings and a hash ref
4888: containing information about the postings (subject, id, timestamp) in a hash.
4889:
4890: 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.
4891:
4892: =item * B<getFeedback>:
4893:
4894: Gets the feedback for the resource and returns the raw feedback string
4895: for the resource, or the null string if there is no feedback or the
4896: email data was not extracted when the nav map was constructed. Usually
4897: used like this:
4898:
4899: for my $url (split(/\,/, $res->getFeedback())) {
4900: my $link = &escape($url);
4901: ...
4902:
4903: and use the link as appropriate.
4904:
4905: =cut
4906:
4907: sub hasDiscussion {
4908: my $self = shift;
4909: return $self->{NAV_MAP}->hasDiscussion($self->{SYMB});
4910: }
4911:
4912: sub last_post_time {
4913: my $self = shift;
4914: return $self->{NAV_MAP}->last_post_time($self->{SYMB});
4915: }
4916:
4917: sub discussion_info {
4918: my ($self,$filter) = @_;
4919: return $self->{NAV_MAP}->discussion_info($self->{SYMB},$filter);
4920: }
4921:
4922: sub getFeedback {
4923: my $self = shift;
4924: my $source = $self->src();
4925: my $symb = $self->{SYMB};
4926: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4927: return $self->{NAV_MAP}->getFeedback($symb,$source);
4928: }
4929:
4930: sub getErrors {
4931: my $self = shift;
4932: my $source = $self->src();
4933: my $symb = $self->{SYMB};
4934: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4935: return $self->{NAV_MAP}->getErrors($symb,$source);
4936: }
4937:
4938: =pod
4939:
4940: =item * B<parts>():
4941:
4942: Returns a list reference containing sorted strings corresponding to
4943: each part of the problem. Single part problems have only a part '0'.
4944: Multipart problems do not return their part '0', since they typically
4945: do not really matter.
4946:
4947: =item * B<countParts>():
4948:
4949: Returns the number of parts of the problem a student can answer. Thus,
4950: for single part problems, returns 1. For multipart, it returns the
4951: number of parts in the problem, not including psuedo-part 0.
4952:
4953: =item * B<countResponses>():
4954:
4955: Returns the total number of responses in the problem a student can answer.
4956:
4957: =item * B<responseTypes>():
4958:
4959: Returns a hash whose keys are the response types. The values are the number
4960: of times each response type is used. This is for the I<entire> problem, not
4961: just a single part.
4962:
4963: =item * B<multipart>():
4964:
4965: Returns true if the problem is multipart, false otherwise. Use this instead
4966: of countParts if all you want is multipart/not multipart.
4967:
4968: =item * B<responseType>($part):
4969:
4970: Returns the response type of the part, without the word "response" on the
4971: end. Example return values: 'string', 'essay', 'numeric', etc.
4972:
4973: =item * B<responseIds>($part):
4974:
4975: Retreives the response IDs for the given part as an array reference containing
4976: strings naming the response IDs. This may be empty.
4977:
4978: =back
4979:
4980: =cut
4981:
4982: sub parts {
4983: my $self = shift;
4984:
4985: if ($self->ext) { return []; }
4986:
4987: $self->extractParts();
4988: return $self->{PARTS};
4989: }
4990:
4991: sub countParts {
4992: my $self = shift;
4993:
4994: my $parts = $self->parts();
4995:
4996: # If I left this here, then it's not necessary.
4997: #my $delta = 0;
4998: #for my $part (@$parts) {
4999: # if ($part eq '0') { $delta--; }
5000: #}
5001:
5002: if ($self->{RESOURCE_ERROR}) {
5003: return 0;
5004: }
5005:
5006: return scalar(@{$parts}); # + $delta;
5007: }
5008:
5009: sub countResponses {
5010: my $self = shift;
5011: my $count;
5012: foreach my $part (@{$self->parts()}) {
5013: $count+= scalar($self->responseIds($part));
5014: }
5015: return $count;
5016: }
5017:
5018: sub responseTypes {
5019: my $self = shift;
5020: my %responses;
5021: foreach my $part (@{$self->parts()}) {
5022: foreach my $responsetype ($self->responseType($part)) {
5023: $responses{$responsetype}++ if (defined($responsetype));
5024: }
5025: }
5026: return %responses;
5027: }
5028:
5029: sub multipart {
5030: my $self = shift;
5031: return $self->countParts() > 1;
5032: }
5033:
5034: sub singlepart {
5035: my $self = shift;
5036: return $self->countParts() == 1;
5037: }
5038:
5039: sub responseType {
5040: my $self = shift;
5041: my $part = shift;
5042:
5043: $self->extractParts();
5044: if (defined($self->{RESPONSE_TYPES}->{$part})) {
5045: return @{$self->{RESPONSE_TYPES}->{$part}};
5046: } else {
5047: return undef;
5048: }
5049: }
5050:
5051: sub responseIds {
5052: my $self = shift;
5053: my $part = shift;
5054:
5055: $self->extractParts();
5056: if (defined($self->{RESPONSE_IDS}->{$part})) {
5057: return @{$self->{RESPONSE_IDS}->{$part}};
5058: } else {
5059: return undef;
5060: }
5061: }
5062:
5063: # Private function: Extracts the parts information, both part names and
5064: # part types, and saves it.
5065: sub extractParts {
5066: my $self = shift;
5067:
5068: return if (defined($self->{PARTS}));
5069: return if ($self->ext);
5070:
5071: $self->{PARTS} = [];
5072:
5073: my %parts;
5074:
5075: # Retrieve part count, if this is a problem
5076: if ($self->is_problem()) {
5077: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
5078: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
5079:
5080: if ($partorder) {
5081: my @parts;
5082: for my $part (split (/,/,$partorder)) {
5083: if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
5084: push @parts, $part;
5085: $parts{$part} = 1;
5086: }
5087: }
5088: $self->{PARTS} = \@parts;
5089: } else {
5090: if (!$metadata) {
5091: $self->{RESOURCE_ERROR} = 1;
5092: $self->{PARTS} = [];
5093: $self->{PART_TYPE} = {};
5094: return;
5095: }
5096: foreach my $entry (split(/\,/,$metadata)) {
5097: if ($entry =~ /^(?:part|Task)_(.*)$/) {
5098: my $part = $1;
5099: # This floods the logs if it blows up
5100: if (defined($parts{$part})) {
5101: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->{SYMB});
5102: }
5103:
5104: # check to see if part is turned off.
5105:
5106: if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
5107: $parts{$part} = 1;
5108: }
5109: }
5110: }
5111: my @sortedParts = sort(keys(%parts));
5112: $self->{PARTS} = \@sortedParts;
5113: }
5114:
5115:
5116: # These hashes probably do not need names that end with "Hash"....
5117: my %responseIdHash;
5118: my %responseTypeHash;
5119:
5120:
5121: # Init the responseIdHash
5122: foreach my $part (@{$self->{PARTS}}) {
5123: $responseIdHash{$part} = [];
5124: }
5125:
5126: # Now, the unfortunate thing about this is that parts, part name, and
5127: # response id are delimited by underscores, but both the part
5128: # name and response id can themselves have underscores in them.
5129: # So we have to use our knowlege of part names to figure out
5130: # where the part names begin and end, and even then, it is possible
5131: # to construct ambiguous situations.
5132: foreach my $data (split(/,/, $metadata)) {
5133: if ($data =~ /^([a-zA-Z]+)response_(.*)/
5134: || $data =~ /^(Task)_(.*)/) {
5135: my $responseType = $1;
5136: my $partStuff = $2;
5137: my $partIdSoFar = '';
5138: my @partChunks = split(/_/, $partStuff);
5139: my $i = 0;
5140: for ($i = 0; $i < scalar(@partChunks); $i++) {
5141: if ($partIdSoFar) { $partIdSoFar .= '_'; }
5142: $partIdSoFar .= $partChunks[$i];
5143: if ($parts{$partIdSoFar}) {
5144: my @otherChunks = @partChunks[$i+1..$#partChunks];
5145: my $responseId = join('_', @otherChunks);
5146: if ($self->is_task()) {
5147: push(@{$responseIdHash{$partIdSoFar}},
5148: $partIdSoFar);
5149: } else {
5150: push(@{$responseIdHash{$partIdSoFar}},
5151: $responseId);
5152: }
5153: push(@{$responseTypeHash{$partIdSoFar}},
5154: $responseType);
5155: }
5156: }
5157: }
5158: }
5159: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
5160: #
5161: # Reorder the arrays in the %responseIdHash and %responseTypeHash
5162: if ($resorder) {
5163: my @resorder=split(/,/,$resorder);
5164: foreach my $part (keys(%responseIdHash)) {
5165: my $i=0;
5166: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
5167: my @neworder;
5168: foreach my $possibleid (@resorder) {
5169: if (exists($resids{$possibleid})) {
5170: push(@neworder,$resids{$possibleid});
5171: }
5172: }
5173: my @ids;
5174: my @type;
5175: foreach my $element (@neworder) {
5176: push (@ids,$responseIdHash{$part}->[$element]);
5177: push (@type,$responseTypeHash{$part}->[$element]);
5178: }
5179: $responseIdHash{$part}=\@ids;
5180: $responseTypeHash{$part}=\@type;
5181: }
5182: }
5183: $self->{RESPONSE_IDS} = \%responseIdHash;
5184: $self->{RESPONSE_TYPES} = \%responseTypeHash;
5185: }
5186:
5187: return;
5188: }
5189:
5190: =pod
5191:
5192: =head2 Resource Status
5193:
5194: Problem resources have status information, reflecting their various
5195: dates and completion statuses.
5196:
5197: There are two aspects to the status: the date-related information and
5198: the completion information.
5199:
5200: Idiomatic usage of these two methods would probably look something
5201: like
5202:
5203: foreach my $part ($resource->parts()) {
5204: my $dateStatus = $resource->getDateStatus($part);
5205: my $completionStatus = $resource->getCompletionStatus($part);
5206:
5207: or
5208:
5209: my $status = $resource->status($part);
5210:
5211: ... use it here ...
5212: }
5213:
5214: Which you use depends on exactly what you are looking for. The
5215: status() function has been optimized for the nav maps display and may
5216: not precisely match what you need elsewhere.
5217:
5218: The symbolic constants shown below can be accessed through the
5219: resource object: C<$res->OPEN>.
5220:
5221: =over 4
5222:
5223: =item * B<getDateStatus>($part):
5224:
5225: ($part defaults to 0). A convenience function that returns a symbolic
5226: constant telling you about the date status of the part. The possible
5227: return values are:
5228:
5229: =back
5230:
5231: B<Date Codes>
5232:
5233: =over 4
5234:
5235: =item * B<OPEN_LATER>:
5236:
5237: The problem will be opened later.
5238:
5239: =item * B<OPEN>:
5240:
5241: Open and not yet due.
5242:
5243:
5244: =item * B<PAST_DUE_ANSWER_LATER>:
5245:
5246: The due date has passed, but the answer date has not yet arrived.
5247:
5248: =item * B<PAST_DUE_NO_ANSWER>:
5249:
5250: The due date has passed and there is no answer opening date set.
5251:
5252: =item * B<ANSWER_OPEN>:
5253:
5254: The answer date is here.
5255:
5256: =item * B<NETWORK_FAILURE>:
5257:
5258: The information is unknown due to network failure.
5259:
5260: =back
5261:
5262: =cut
5263:
5264: # Apparently the compiler optimizes these into constants automatically
5265: sub OPEN_LATER { return 0; }
5266: sub OPEN { return 1; }
5267: sub PAST_DUE_NO_ANSWER { return 2; }
5268: sub PAST_DUE_ANSWER_LATER { return 3; }
5269: sub ANSWER_OPEN { return 4; }
5270: sub NOTHING_SET { return 5; }
5271: sub NETWORK_FAILURE { return 100; }
5272:
5273: # getDateStatus gets the date status for a given problem part.
5274: # Because answer date, due date, and open date are fully independent
5275: # (i.e., it is perfectly possible to *only* have an answer date),
5276: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
5277: # (past, future, none given). This function handles this with a decision
5278: # tree. Read the comments to follow the decision tree.
5279:
5280: sub getDateStatus {
5281: my $self = shift;
5282: my $part = shift;
5283: $part = "0" if (!defined($part));
5284:
5285: # Always return network failure if there was one.
5286: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
5287:
5288: my $now = time();
5289:
5290: my $open = $self->opendate($part);
5291: my $due = $self->duedate($part);
5292: my $answer = $self->answerdate($part);
5293:
5294: if (!$open && !$due && !$answer) {
5295: # no data on the problem at all
5296: # should this be the same as "open later"? think multipart.
5297: return $self->NOTHING_SET;
5298: }
5299: if (!$open || $now < $open) {return $self->OPEN_LATER}
5300: if (!$due || $now < $due) {return $self->OPEN}
5301: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
5302: if ($answer) { return $self->ANSWER_OPEN; }
5303: return PAST_DUE_NO_ANSWER;
5304: }
5305:
5306: =pod
5307:
5308: B<>
5309:
5310: =over 4
5311:
5312: =item * B<getCompletionStatus>($part):
5313:
5314: ($part defaults to 0.) A convenience function that returns a symbolic
5315: constant telling you about the completion status of the part, with the
5316: following possible results:
5317:
5318: =back
5319:
5320: B<Completion Codes>
5321:
5322: =over 4
5323:
5324: =item * B<NOT_ATTEMPTED>:
5325:
5326: Has not been attempted at all.
5327:
5328: =item * B<INCORRECT>:
5329:
5330: Attempted, but wrong by student.
5331:
5332: =item * B<INCORRECT_BY_OVERRIDE>:
5333:
5334: Attempted, but wrong by instructor override.
5335:
5336: =item * B<CORRECT>:
5337:
5338: Correct or correct by instructor.
5339:
5340: =item * B<CORRECT_BY_OVERRIDE>:
5341:
5342: Correct by instructor override.
5343:
5344: =item * B<EXCUSED>:
5345:
5346: Excused. Not yet implemented.
5347:
5348: =item * B<NETWORK_FAILURE>:
5349:
5350: Information not available due to network failure.
5351:
5352: =item * B<ATTEMPTED>:
5353:
5354: Attempted, and not yet graded.
5355:
5356: =item * B<CREDIT_ATTEMPTED>:
5357:
5358: Attempted, and credit received for attempt (survey and anonymous survey only).
5359:
5360: =back
5361:
5362: =cut
5363:
5364: sub NOT_ATTEMPTED { return 10; }
5365: sub INCORRECT { return 11; }
5366: sub INCORRECT_BY_OVERRIDE { return 12; }
5367: sub CORRECT { return 13; }
5368: sub CORRECT_BY_OVERRIDE { return 14; }
5369: sub EXCUSED { return 15; }
5370: sub ATTEMPTED { return 16; }
5371: sub CREDIT_ATTEMPTED { return 17; }
5372:
5373: sub getCompletionStatus {
5374: my $self = shift;
5375: my $part = shift;
5376: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
5377:
5378: my $status = $self->queryRestoreHash('solved', $part);
5379:
5380: # Left as separate if statements in case we ever do more with this
5381: if ($status eq 'correct_by_student') {return $self->CORRECT;}
5382: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
5383: if ($status eq 'correct_by_override') {
5384: return $self->CORRECT_BY_OVERRIDE;
5385: }
5386: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
5387: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
5388: if ($status eq 'excused') {return $self->EXCUSED; }
5389: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
5390: if ($status eq 'credit_attempted') {
5391: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
5392: return $self->CREDIT_ATTEMPTED;
5393: } else {
5394: return $self->ATTEMPTED;
5395: }
5396: }
5397: return $self->NOT_ATTEMPTED;
5398: }
5399:
5400: sub queryRestoreHash {
5401: my $self = shift;
5402: my $hashentry = shift;
5403: my $part = shift;
5404: $part = "0" if (!defined($part) || $part eq '');
5405: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
5406:
5407: $self->getReturnHash();
5408:
5409: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
5410: }
5411:
5412: =pod
5413:
5414: B<Composite Status>
5415:
5416: Along with directly returning the date or completion status, the
5417: resource object includes a convenience function B<status>() that will
5418: combine the two status tidbits into one composite status that can
5419: represent the status of the resource as a whole. This method represents
5420: the concept of the thing we want to display to the user on the nav maps
5421: screen, which is a combination of completion and open status. The precise logic is
5422: documented in the comments of the status method. The following results
5423: may be returned, all available as methods on the resource object
5424: ($res->NETWORK_FAILURE): In addition to the return values that match
5425: the date or completion status, this function can return "ANSWER_SUBMITTED"
5426: if that problemstatus parameter value is set to No, suppressing the
5427: incorrect/correct feedback.
5428:
5429: =over 4
5430:
5431: =item * B<NETWORK_FAILURE>:
5432:
5433: The network has failed and the information is not available.
5434:
5435: =item * B<NOTHING_SET>:
5436:
5437: No dates have been set for this problem (part) at all. (Because only
5438: certain parts of a multi-part problem may be assigned, this can not be
5439: collapsed into "open later", as we do not know a given part will EVER
5440: be opened. For single part, this is the same as "OPEN_LATER".)
5441:
5442: =item * B<CORRECT>:
5443:
5444: For any reason at all, the part is considered correct.
5445:
5446: =item * B<EXCUSED>:
5447:
5448: For any reason at all, the problem is excused.
5449:
5450: =item * B<PAST_DUE_NO_ANSWER>:
5451:
5452: The problem is past due, not considered correct, and no answer date is
5453: set.
5454:
5455: =item * B<PAST_DUE_ANSWER_LATER>:
5456:
5457: The problem is past due, not considered correct, and an answer date in
5458: the future is set.
5459:
5460: =item * B<ANSWER_OPEN>:
5461:
5462: The problem is past due, not correct, and the answer is now available.
5463:
5464: =item * B<OPEN_LATER>:
5465:
5466: The problem is not yet open.
5467:
5468: =item * B<TRIES_LEFT>:
5469:
5470: The problem is open, has been tried, is not correct, but there are
5471: tries left.
5472:
5473: =item * B<INCORRECT>:
5474:
5475: The problem is open, and all tries have been used without getting the
5476: correct answer.
5477:
5478: =item * B<OPEN>:
5479:
5480: The item is open and not yet tried.
5481:
5482: =item * B<ATTEMPTED>:
5483:
5484: The problem has been attempted.
5485:
5486: =item * B<CREDIT_ATTEMPTED>:
5487:
5488: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
5489:
5490: =item * B<ANSWER_SUBMITTED>:
5491:
5492: An answer has been submitted, but the student should not see it.
5493:
5494: =back
5495:
5496: =cut
5497:
5498: sub TRIES_LEFT { return 20; }
5499: sub ANSWER_SUBMITTED { return 21; }
5500: sub PARTIALLY_CORRECT { return 22; }
5501:
5502: sub RESERVED_LATER { return 30; }
5503: sub RESERVED { return 31; }
5504: sub RESERVED_LOCATION { return 32; }
5505: sub RESERVABLE { return 33; }
5506: sub RESERVABLE_LATER { return 34; }
5507: sub NOTRESERVABLE { return 35; }
5508: sub NOT_IN_A_SLOT { return 36; }
5509: sub NEEDS_CHECKIN { return 37; }
5510: sub WAITING_FOR_GRADE { return 38; }
5511: sub UNKNOWN { return 39; }
5512:
5513: sub status {
5514: my $self = shift;
5515: my $part = shift;
5516: if (!defined($part)) { $part = "0"; }
5517: my $completionStatus = $self->getCompletionStatus($part);
5518: my $dateStatus = $self->getDateStatus($part);
5519:
5520: # What we have is a two-dimensional matrix with 4 entries on one
5521: # dimension and 5 entries on the other, which we want to colorize,
5522: # plus network failure and "no date data at all".
5523:
5524: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
5525: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
5526:
5527: my $suppressFeedback = 0;
5528: if (($self->problemstatus($part) eq 'no') ||
5529: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5530: $suppressFeedback = 1;
5531: }
5532: # If there's an answer date and we're past it, don't
5533: # suppress the feedback; student should know
5534: if ($self->duedate($part) && $self->duedate($part) < time() &&
5535: $self->answerdate($part) && $self->answerdate($part) < time()) {
5536: $suppressFeedback = 0;
5537: }
5538:
5539: # There are a few whole rows we can dispose of:
5540: if ($completionStatus == CORRECT ||
5541: $completionStatus == CORRECT_BY_OVERRIDE ) {
5542: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5543: my $awarded=$self->awarded($part);
5544: if ($awarded < 1 && $awarded > 0) {
5545: return PARTIALLY_CORRECT;
5546: } elsif ($awarded<1) {
5547: return INCORRECT;
5548: }
5549: return CORRECT;
5550: }
5551:
5552: # If it's WRONG... and not open
5553: if ( ($completionStatus == INCORRECT ||
5554: $completionStatus == INCORRECT_BY_OVERRIDE)
5555: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5556: return INCORRECT;
5557: }
5558:
5559: if ($completionStatus == ATTEMPTED) {
5560: return ATTEMPTED;
5561: }
5562:
5563: if ($completionStatus == CREDIT_ATTEMPTED) {
5564: return CREDIT_ATTEMPTED;
5565: }
5566:
5567: # If it's EXCUSED, then return that no matter what
5568: if ($completionStatus == EXCUSED) {
5569: return EXCUSED;
5570: }
5571:
5572: if ($dateStatus == NOTHING_SET) {
5573: return NOTHING_SET;
5574: }
5575:
5576: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5577: # by 4 matrix (date statuses).
5578:
5579: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5580: $dateStatus == PAST_DUE_NO_ANSWER ) {
5581: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5582: }
5583:
5584: if ($dateStatus == ANSWER_OPEN) {
5585: return ANSWER_OPEN;
5586: }
5587:
5588: # Now: (incorrect, incorrect_override, not_attempted) x
5589: # (open_later), (open)
5590:
5591: if ($dateStatus == OPEN_LATER) {
5592: return OPEN_LATER;
5593: }
5594:
5595: # If it's WRONG...
5596: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5597: # and there are TRIES LEFT:
5598: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5599: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5600: }
5601: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5602: }
5603:
5604: # Otherwise, it's untried and open
5605: return OPEN;
5606: }
5607:
5608: sub check_for_slot {
5609: my $self = shift;
5610: my $part = shift;
5611: my $symb = $self->{SYMB};
5612: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5613: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5614: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5615: my $cid=$env{'request.course.id'};
5616: my $cdom=$env{'course.'.$cid.'.domain'};
5617: my $cnum=$env{'course.'.$cid.'.num'};
5618: my $now = time;
5619: my $num_usable_slots = 0;
5620: my ($checkedin,$checkedinslot,%consumed_uniq,%slots);
5621: if (@slots > 0) {
5622: %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5623: if (&Apache::lonnet::error(%slots)) {
5624: return (UNKNOWN);
5625: }
5626: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
5627: foreach my $slot_name (@sorted_slots) {
5628: next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
5629: my $end = $slots{$slot_name}->{'endtime'};
5630: my $start = $slots{$slot_name}->{'starttime'};
5631: my $ip = $slots{$slot_name}->{'ip'};
5632: if ($self->simpleStatus() == OPEN) {
5633: if ($end > $now) {
5634: if ($start > $now) {
5635: return (RESERVED_LATER,$start,$slot_name);
5636: } else {
5637: if ($ip ne '') {
5638: if (!&Apache::loncommon::check_ip_acc($ip)) {
5639: return (RESERVED_LOCATION,$end,$slot_name);
5640: }
5641: }
5642: my @proctors;
5643: if ($slots{$slot_name}->{'proctor'} ne '') {
5644: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5645: }
5646: if (@proctors > 0) {
5647: ($checkedin,$checkedinslot) = $self->checkedin();
5648: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5649: ($checkedinslot eq $slot_name)) {
5650: return (NEEDS_CHECKIN,undef,$slot_name);
5651: }
5652: }
5653: return (RESERVED,$end,$slot_name);
5654: }
5655: }
5656: } elsif ($end > $now) {
5657: $num_usable_slots ++;
5658: }
5659: }
5660: my ($is_correct,$wait_for_grade);
5661: if ($self->is_task()) {
5662: my $taskstatus = $self->taskstatus();
5663: $is_correct = (($taskstatus eq 'pass') ||
5664: ($self->solved() =~ /^correct_/));
5665: unless ($taskstatus =~ /^(?:pass|fail)$/) {
5666: $wait_for_grade = 1;
5667: }
5668: } else {
5669: unless ($self->completable()) {
5670: $wait_for_grade = 1;
5671: }
5672: unless (($self->problemstatus($part) eq 'no') ||
5673: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5674: $is_correct = ($self->solved($part) =~ /^correct_/);
5675: $wait_for_grade = 0;
5676: }
5677: }
5678: ($checkedin,$checkedinslot) = $self->checkedin();
5679: if ($checkedin) {
5680: if (ref($slots{$checkedinslot}) eq 'HASH') {
5681: $consumed_uniq{$checkedinslot} = $slots{$checkedinslot}{'uniqueperiod'};
5682: }
5683: if ($wait_for_grade) {
5684: return (WAITING_FOR_GRADE);
5685: } elsif ($is_correct) {
5686: return (CORRECT);
5687: }
5688: }
5689: if ($num_usable_slots) {
5690: return(NOT_IN_A_SLOT);
5691: }
5692: }
5693: my $reservable = &Apache::lonnet::get_reservable_slots($cnum,$cdom,$env{'user.name'},
5694: $env{'user.domain'});
5695: if (ref($reservable) eq 'HASH') {
5696: if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
5697: foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
5698: my $canuse;
5699: if (($reservable->{'now'}{$slot}{'symb'} eq '') ||
5700: ($reservable->{'now'}{$slot}{'symb'} eq $symb)) {
5701: $canuse = 1;
5702: }
5703: if ($canuse) {
5704: if ($checkedin) {
5705: if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
5706: my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
5707: if ($reservable->{'now'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
5708: my ($new_uniq_start,$new_uniq_end) = ($1,$2);
5709: next if (!
5710: ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
5711: ($uniqstart > $new_uniq_end && $uniqend > $new_uniq_end ));
5712: }
5713: }
5714: }
5715: return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
5716: }
5717: }
5718: }
5719: if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
5720: foreach my $slot (@{$reservable->{'future_order'}}) {
5721: my $canuse;
5722: if (($reservable->{'future'}{$slot}{'symb'} eq '') ||
5723: ($reservable->{'future'}{$slot}{'symb'} eq $symb)) {
5724: $canuse = 1;
5725: }
5726: if ($canuse) {
5727: if ($checkedin) {
5728: if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
5729: my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
5730: if ($reservable->{'future'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
5731: my ($new_uniq_start,$new_uniq_end) = ($1,$2);
5732: next if (!
5733: ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
5734: ($uniqstart > $new_uniq_end && $uniqend > $new_uniq_end ));
5735: }
5736: }
5737: }
5738: return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
5739: }
5740: }
5741: }
5742: }
5743: return(NOTRESERVABLE);
5744: }
5745: return;
5746: }
5747:
5748: sub CLOSED { return 23; }
5749: sub ERROR { return 24; }
5750:
5751: =pod
5752:
5753: B<Simple Status>
5754:
5755: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5756: "Simple status" corresponds to "which icon is shown on the
5757: Navmaps". There are six "simple" statuses:
5758:
5759: =over 4
5760:
5761: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5762:
5763: =item * B<OPEN>: The problem is open and unattempted.
5764:
5765: =item * B<CORRECT>: The problem is correct for any reason.
5766:
5767: =item * B<INCORRECT>: The problem is incorrect and can still be
5768: completed successfully.
5769:
5770: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5771: does not know if they are correct. (The ellipsis icon.)
5772:
5773: =item * B<ERROR>: There is an error retrieving information about this
5774: problem.
5775:
5776: =back
5777:
5778: =cut
5779:
5780: # This hash maps the composite status to this simple status, and
5781: # can be used directly, if you like
5782: my %compositeToSimple =
5783: (
5784: NETWORK_FAILURE() => ERROR,
5785: NOTHING_SET() => CLOSED,
5786: CORRECT() => CORRECT,
5787: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5788: EXCUSED() => CORRECT,
5789: PAST_DUE_NO_ANSWER() => INCORRECT,
5790: PAST_DUE_ANSWER_LATER() => INCORRECT,
5791: ANSWER_OPEN() => INCORRECT,
5792: OPEN_LATER() => CLOSED,
5793: TRIES_LEFT() => OPEN,
5794: INCORRECT() => INCORRECT,
5795: OPEN() => OPEN,
5796: ATTEMPTED() => ATTEMPTED,
5797: CREDIT_ATTEMPTED() => CORRECT,
5798: ANSWER_SUBMITTED() => ATTEMPTED
5799: );
5800:
5801: sub simpleStatus {
5802: my $self = shift;
5803: my $part = shift;
5804: my $status = $self->status($part);
5805: return $compositeToSimple{$status};
5806: }
5807:
5808: =pod
5809:
5810: B<simpleStatusCount> will return an array reference containing, in
5811: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5812: and ERROR parts the given problem has.
5813:
5814: =cut
5815:
5816: # This maps the status to the slot we want to increment
5817: my %statusToSlotMap =
5818: (
5819: OPEN() => 0,
5820: CLOSED() => 1,
5821: CORRECT() => 2,
5822: INCORRECT() => 3,
5823: ATTEMPTED() => 4,
5824: ERROR() => 5
5825: );
5826:
5827: sub statusToSlot { return $statusToSlotMap{shift()}; }
5828:
5829: sub simpleStatusCount {
5830: my $self = shift;
5831:
5832: my @counts = (0, 0, 0, 0, 0, 0, 0);
5833: foreach my $part (@{$self->parts()}) {
5834: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5835: }
5836:
5837: return \@counts;
5838: }
5839:
5840: =pod
5841:
5842: B<Completable>
5843:
5844: The completable method represents the concept of I<whether the student can
5845: currently do the problem>. If the student can do the problem, which means
5846: that it is open, there are tries left, and if the problem is manually graded
5847: or the grade is suppressed via problemstatus, the student has not tried it
5848: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5849: either the student has tried it and there is no feedback, or that for
5850: some reason it is no longer completable (not open yet, successfully completed,
5851: out of tries, etc.). As an example, this is used as the filter for the
5852: "Uncompleted Homework" option for the nav maps.
5853:
5854: If this does not quite meet your needs, do not fiddle with it (unless you are
5855: fixing it to better match the student's conception of "completable" because
5856: it's broken somehow)... make a new method.
5857:
5858: =cut
5859:
5860: sub completable {
5861: my $self = shift;
5862: if (!$self->is_problem()) { return 0; }
5863: my $partCount = $self->countParts();
5864:
5865: foreach my $part (@{$self->parts()}) {
5866: if ($part eq '0' && $partCount != 1) { next; }
5867: my $status = $self->status($part);
5868: # "If any of the parts are open, or have tries left (implies open),
5869: # and it is not "attempted" (manually graded problem), it is
5870: # not "complete"
5871: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5872: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5873: $status == ANSWER_SUBMITTED() ) {
5874: # did this part already, as well as we can
5875: next;
5876: }
5877: if ($status == OPEN() || $status == TRIES_LEFT()) {
5878: return 1;
5879: }
5880: }
5881:
5882: # If all the parts were complete, so was this problem.
5883: return 0;
5884: }
5885:
5886: =pod
5887:
5888: B<Answerable>
5889:
5890: The answerable method differs from the completable method in its handling of problem parts
5891: for which feedback on correctness is suppressed, but the student still has tries left, and
5892: the problem part is not past due, (i.e., the student could submit a different answer if
5893: he/she so chose). For that case completable will return 0, whereas answerable will return 1.
5894:
5895: =cut
5896:
5897: sub answerable {
5898: my $self = shift;
5899: if (!$self->is_problem()) { return 0; }
5900: my $partCount = $self->countParts();
5901: foreach my $part (@{$self->parts()}) {
5902: if ($part eq '0' && $partCount != 1) { next; }
5903: my $status = $self->status($part);
5904: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5905: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5906: $status == ANSWER_SUBMITTED() ) {
5907: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5908: return 1;
5909: }
5910: }
5911: if ($status == OPEN() || $status == TRIES_LEFT() || $status == NETWORK_FAILURE()) {
5912: return 1;
5913: }
5914: }
5915: # None of the parts were answerable, so neither is this problem.
5916: return 0;
5917: }
5918:
5919: =pod
5920:
5921: =head2 Resource/Nav Map Navigation
5922:
5923: =over 4
5924:
5925: =item * B<getNext>():
5926:
5927: Retreive an array of the possible next resources after this
5928: one. Always returns an array, even in the one- or zero-element case.
5929:
5930: =item * B<getPrevious>():
5931:
5932: Retreive an array of the possible previous resources from this
5933: one. Always returns an array, even in the one- or zero-element case.
5934:
5935: =cut
5936:
5937: sub getNext {
5938: my $self = shift;
5939: my @branches;
5940: my $to = $self->to();
5941: foreach my $branch ( split(/,/, $to) ) {
5942: my $choice = $self->{NAV_MAP}->getById($branch);
5943: #if (!$choice->condition()) { next; }
5944: my $next = $choice->goesto();
5945: $next = $self->{NAV_MAP}->getById($next);
5946:
5947: push @branches, $next;
5948: }
5949: return \@branches;
5950: }
5951:
5952: sub getPrevious {
5953: my $self = shift;
5954: my @branches;
5955: my $from = $self->from();
5956: foreach my $branch ( split(/,/, $from)) {
5957: my $choice = $self->{NAV_MAP}->getById($branch);
5958: my $prev = $choice->comesfrom();
5959: $prev = $self->{NAV_MAP}->getById($prev);
5960:
5961: push @branches, $prev;
5962: }
5963: return \@branches;
5964: }
5965:
5966: sub browsePriv {
5967: my $self = shift;
5968: my $noblockcheck = shift;
5969: if (defined($self->{BROWSE_PRIV})) {
5970: return $self->{BROWSE_PRIV};
5971: }
5972:
5973: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5974: $self->{SYMB},undef,
5975: undef,$noblockcheck);
5976: }
5977:
5978: =pod
5979:
5980: =back
5981:
5982: =cut
5983:
5984: 1;
5985:
5986: __END__
5987:
5988:
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